US-12618402-B2 - Pump assembly

Abstract

A pump assembly includes a housing with an air inlet and an air outlet, a motor supported by the housing, the motor including a drive shaft rotatable about a drive shaft axis, a first plurality of diaphragms supported by the housing, the first plurality of diaphragms positioned along a first plane, and a second plurality of diaphragms supported by the housing, the second plurality diaphragms positioned along a second plane, the second plane spaced apart from the first plane. Rotation of the drive shaft is operable to move each diaphragm of the first plurality of diaphragms and each diaphragm of the second plurality of diaphragms from an intake position to a compression position to pump a fluid from the air inlet through the air outlet.

Inventors

• Krzysztof ZULAUF
• Maxime Samain
• Eric Michalak
• Robert J. McMillen
• Wade O'Moore
• Horia Blendea
• Paul Tindall
• Stefano Nicola

Assignees

• LEGGETT & PLATT CANADA CO.

Dates

Publication Date

20260505

Application Date

20201211

Claims (20)

1. 1 . A pump assembly comprising: a housing including a main housing, an upper cover, a lower cover, a fluid outlet and an interior volume open to the surrounding environment through open ends of the main housing, wherein a fluid flow is drawn into the interior volume of the main housing through the open ends of the main housing; a motor supported by the interior volume of the main housing, the motor including a drive shaft rotatable about a drive shaft axis; a crankshaft coupled to the drive shaft for rotation by the drive shaft; a diaphragm assembly supported by the main housing and including a first, second, third, and fourth diaphragm, wherein the main housing and diaphragm assembly are configured such that each of the first, second, third, and fourth diaphragms is fluidly connected with the interior volume of the main housing to receive the fluid flow drawn into the interior volume of the main housing; a first connecting rod coupled to the crankshaft and to the first diaphragm and the second diaphragm, the first connecting rod configured to reciprocate along a first connecting rod axis in response to rotation of the crankshaft to move the first diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the second diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the first diaphragm; and a second connecting rod coupled to the crankshaft and to the third diaphragm and the fourth diaphragm, the second connecting rod configured to reciprocate along a second connecting rod axis that is not parallel to the first connecting rod axis in response to rotation of the crankshaft to move the third diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the fourth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the third diaphragm, wherein the second connecting rod axis is offset from the first connecting rod axis in a direction along the drive shaft axis, wherein the first diaphragm is positioned along a first plane of the main housing, the second diaphragm is positioned along a second plane of the main housing spaced apart from and parallel to the first plane, the third diaphragm is positioned along a third plane of the main housing orthogonal to the first and second planes, and the fourth diaphragm is positioned along a fourth plane of the main housing spaced apart from and parallel to the third plane, wherein the first, second, third, and fourth diaphragms define a diaphragm assembly positioned between an exterior surface of the main housing and an interior surface of each he upper and lower covers, the diaphragm assembly further including a plurality of air intake valves and a plurality of air outlet valves, wherein each diaphragm of the diaphragm assembly is associated with an aperture provided in the main housing, wherein each of the upper and lower covers includes a plurality of recesses each aligned with a respective aperture in the main housing and an associated diaphragm, wherein each pair of aligned recesses and diaphragms defines an air chamber therebetween, wherein each air chamber is in fluid communication with a respective air intake valve of the plurality of air intake valves and a respective air outlet valve of the plurality of air outlet valves, wherein the air outlet valve for the air chamber of the first diaphragm and the air outlet valve for the air chamber of the third diaphragm are each in fluid communication with a first air outlet passageway recessed into the first and third planes of the exterior surface of the main housing between the diaphragm assembly and the exterior surface of the main housing such that the diaphragm assembly forms a portion of an outer lateral wall of the first air outlet passageway apart from each air outlet valve in fluid communication with the first air outlet passageway, wherein the air outlet valve for the air chamber for the second diaphragm and the air outlet valve for the air chamber for the fourth diaphragm are each in fluid communication with a second air outlet passageway recessed into the second and fourth planes of the exterior surface of the main housing between the diaphragm assembly and the exterior surface of the main housing such that the diaphragm assembly forms a portion of an outer lateral wall of the second air outlet passageway apart from each air outlet valve in fluid communication with the second air outlet passageway, wherein each of the first and second air outlet passageways is configured to provide fluid communication to the fluid outlet from two air chambers orthogonally positioned relative to each other.
2. 2 . The pump assembly of claim 1 , wherein the first diaphragm is positioned on a first end of the first connecting rod and the second diaphragm is positioned on a second end of the first connecting rod opposite the first end of the first connecting rod such that the first diaphragm and the second diaphragm move together in the same direction with the reciprocating first connecting rod, and the third diaphragm is positioned on a first end of the second connecting rod and the fourth diaphragm is positioned on a second end of the second connecting rod opposite the first end of the second connecting rod such that the third diaphragm and the fourth diaphragm move together in the same direction with the reciprocating second connecting rod.
3. 3 . The pump assembly of claim 1 , further comprising a third connecting rod coupled to the crankshaft and to a fifth diaphragm and a sixth diaphragm, the third connecting rod configured to reciprocate along a third connecting rod axis that is parallel to the first connecting rod axis in response to rotation of the crankshaft to move the fifth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the sixth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the fifth diaphragm, wherein the third connecting rod axis is offset from the second connecting rod axis in a direction along the drive shaft axis; and a fourth connecting rod coupled to the crankshaft and to a seventh diaphragm and an eighth diaphragm, the fourth connecting rod configured to reciprocate along a fourth connecting rod axis that is parallel to the second connecting rod axis in response to rotation of the crankshaft to move the seventh diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the eighth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the seventh diaphragm, wherein the fourth connecting rod axis is offset from the third connecting rod axis in a direction along the drive shaft axis.
4. 4 . The pump assembly of claim 3 , wherein the third connecting rod reciprocates out of phase with the first connecting rod and the fourth connecting rod reciprocates out of phase with the second connecting rod.
5. 5 . The pump assembly of claim 1 , wherein the drive shaft axis is a first axis and the crankshaft includes a first offset rod segment having a second axis parallel to and offset from the first axis in a first direction from the first axis and a second offset rod segment offset from the first offset rod segment in a direction along the first axis and having a third axis parallel to and offset from the first axis in a second direction opposite from the first direction, and wherein the first connecting rod is coupled to the first offset rod segment and the second connecting rod is coupled to the first offset rod segment.
6. 6 . The pump assembly of claim 5 , wherein the first connecting rod axis is orthogonal to the second connecting rod axis.
7. 7 . The pump assembly of claim 5 , further comprising a third connecting rod coupled to the second offset rod segment and to a fifth diaphragm and a sixth diaphragm, the third connecting rod configured to reciprocate along a third connecting rod axis that is parallel to the first connecting rod axis in response to rotation of the crankshaft to move the fifth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the sixth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the fifth diaphragm, wherein the third connecting rod axis is offset from the second connecting rod axis in a direction along the drive shaft axis; and a fourth connecting rod coupled to the second offset rod segment and to a seventh diaphragm and an eighth diaphragm, the fourth connecting rod configured to reciprocate along a fourth connecting rod axis that is parallel to the second connecting rod axis in response to rotation of the crankshaft to move the seventh diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the eighth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the seventh diaphragm, wherein the fourth connecting rod axis is offset from the third connecting rod axis in a direction along the drive shaft axis.
8. 8 . The pump assembly of claim 7 , wherein the third connecting rod reciprocates out of phase with the first connecting rod and the fourth connecting rod reciprocates out of phase with the second connecting rod.
9. 9 . The pump assembly of claim 7 , wherein the fifth diaphragm is configured to move between the intake position and the compression position out of phase with the sixth diaphragm and the seventh diaphragm is configured to move between the intake position and the compression position out of phase with the eighth diaphragm.
10. 10 . The pump assembly of claim 7 , wherein the third connecting rod axis is orthogonal to the fourth connecting rod axis.
11. 11 . The pump assembly of claim 7 , wherein the fifth diaphragm is configured to move between the intake position and the compression position out of phase with the first diaphragm and the eighth diaphragm is configured to move between the intake position and the compression position out of phase with the third diaphragm.
12. 12 . The pump assembly of claim 7 , wherein the fifth diaphragm is positioned on a first end of the third connecting rod and the sixth diaphragm is positioned on a second end of the third connecting rod opposite the first end of the third connecting rod such that the fifth diaphragm and the sixth diaphragm move together in the same direction with the reciprocating third connecting rod, and the seventh diaphragm is positioned on a first end of the fourth connecting rod and the eighth diaphragm is positioned on a second end of the fourth connecting rod opposite the first end of the fourth connecting rod such that the seventh diaphragm and the eighth diaphragm move together in the same direction with the reciprocating fourth connecting rod.
13. 13 . The pump assembly of claim 5 , wherein the first offset rod segment extends between first and second counterweight portions of the crankshaft and the second offset rod segment extends between the second counterweight portion and a third counterweight portion of the crankshaft.
14. 14 . The pump assembly of claim 5 , wherein the first diaphragm is positioned on a first end of the first connecting rod and the second diaphragm is positioned on a second end of the first connecting rod opposite the first end of the first connecting rod such that the first diaphragm and the second diaphragm move together in the same direction with the reciprocating first connecting rod, and the third diaphragm is positioned on a first end of the second connecting rod and the fourth diaphragm is positioned on a second end of the second connecting rod opposite the first end of the second connecting rod such that the third diaphragm and the fourth diaphragm move together in the same direction with the reciprocating second connecting rod.
15. 15 . The pump assembly of claim 1 , wherein the housing includes an upper cover and a lower cover, wherein the diaphragm assembly has a main body formed as a single piece of material, wherein the first, second, third, and fourth diaphragms the plurality of air intake valves, and the plurality of air outlet valves are integrally formed with the single piece of material, and.
16. 16 . The pump assembly of claim 5 , further comprising a third connecting rod coupled to the second offset rod segment and to a fifth diaphragm and a sixth diaphragm, the third connecting rod configured to reciprocate along a third connecting rod axis that is parallel to the first connecting rod axis in response to rotation of the crankshaft to move the fifth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the sixth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the fifth diaphragm, wherein the third connecting rod axis is offset from the second connecting rod axis in a direction along the drive shaft axis; and a fourth connecting rod coupled to the second offset rod segment and to a seventh diaphragm and an eighth diaphragm, the fourth connecting rod configured to reciprocate along a fourth connecting rod axis that is parallel to the second connecting rod axis in response to rotation of the crankshaft to move the seventh diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the eighth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the seventh diaphragm, wherein the fourth connecting rod axis is offset from the third connecting rod axis in a direction along the drive shaft axis wherein the fifth diaphragm is positioned along the first plane of the main housing, the sixth diaphragm is positioned along the second plane of the main housing, the seventh diaphragm is positioned along the third plane of the main housing, and the eighth diaphragm is positioned along the fourth plane of the main housing, such that the sixth diaphragm is orthogonal to seventh diaphragm and the sixth diaphragm is orthogonal to the eight diaphragm, wherein each of the fifth, sixth, seventh, and eighth diaphragms is integrally formed with the single piece of material of the diaphragm assembly and each of the fifth, sixth, seventh, and eighth diaphragms has an associated air intake valve and an associated air outlet valve each integrally formed with the single piece of material, wherein each of the fifth, sixth, seventh, and eighth diaphragms is associated with an aperture provided in the main housing, wherein each of the upper and lower covers includes a plurality of recesses each aligned with a respective aperture in the main housing that is associated with each of the fifth, sixth, seventh, and eighth diaphragms, wherein each pair of aligned recesses and each of the associated fifth, sixth, seventh, and eighth diaphragms defines an air chamber therebetween, wherein each air chamber for the fifth, sixth, seventh, and eighth diaphragms is in fluid communication with a respective air outlet valve, wherein the air outlet valve for the air chamber for the fifth diaphragm and the air outlet for the air chamber for the seventh diaphragm are each in fluid communication with the first air outlet passageway recessed into the first and third planes of the exterior surface of the main housing to provide fluid communication to the fluid outlet from the air chambers for the fifth and seventh diaphragms that are orthogonally positioned relative to each other, wherein the air outlet valve for the air chamber of the sixth diaphragm and the air outlet valve for the air chamber for the eighth diaphragm are each in fluid communication with the second air outlet passageway recessed into the second and fourth planes of the exterior surface of the main housing to provide fluid communication to the fluid outlet from the air chambers for the sixth and eighth diaphragms that are orthogonally positioned relative to each other.
17. 17 . A pump assembly comprising: a housing including a main housing, an upper cover, a lower cover, a fluid outlet and an interior volume open to the surrounding environment through open ends of the housing, wherein a fluid flow is drawn into the interior volume of the main housing through the open ends of the main housing; a motor supported by the main housing, the motor including a drive shaft rotatable about a drive shaft axis; a crankshaft coupled to the drive shaft for rotation by the drive shaft; a diaphragm assembly supported by the main housing and including a first, second, third, and fourth diaphragm, wherein the main housing and diaphragm assembly are configured such that each of the first, second, third, and fourth diaphragms is fluidly connected with the interior volume of the main housing to receive the fluid flow drawn into the interior volume of the main housing; a first connecting rod coupled to the crankshaft and to the first diaphragm and the second diaphragm, the first connecting rod configured to reciprocate along a first connecting rod axis in response to rotation of the crankshaft to move the first diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the second diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the first diaphragm; and a second connecting rod coupled to the crankshaft and to the third diaphragm and the fourth diaphragm, the second connecting rod configured to reciprocate along a second connecting rod axis that is not parallel to the first connecting rod axis in response to rotation of the crankshaft to move the third diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the fourth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the third diaphragm, wherein the second connecting rod axis is offset from the first connecting rod axis in a direction along the drive shaft axis, wherein the first diaphragm is positioned along a first plane of the main housing, the second diaphragm is positioned along a second plane of the main housing spaced apart from and parallel to the first plane, the third diaphragm is positioned along a third plane of the main housing orthogonal to the first and second planes, and the fourth diaphragm is positioned along a fourth plane of the main housing spaced apart from and parallel to the third plane, wherein the first, second, third, and fourth diaphragms define a diaphragm assembly positioned between an exterior surface of the main housing and an interior surface of each of the upper and lower covers, the diaphragm assembly further including a plurality of air intake valves and a plurality of air outlet valves, wherein each diaphragm of the diaphragm assembly is associated with an aperture provided in the main housing, wherein the diaphragm assembly has a main body integrally formed as a single piece of material, wherein each diaphragm of the diaphragm assembly, each air intake valve of the plurality of air intake valves, and each air outlet valve of the plurality of air outlet valves is integrally formed with the single piece of material, wherein each of the first, second, third, and fourth diaphragms is associated with a respective aperture provided in the main housing, wherein each of the upper and lower covers includes a plurality of recesses each aligned with a respective aperture in the main housing and an associated diaphragm, wherein each pair of aligned recesses and diaphragms defines an air chamber therebetween, wherein each air chamber is in fluid communication with a respective air intake valve of the plurality of air intake valves, each air intake valve is configured to be in fluid communication with a corresponding air intake passageway formed in the main housing, and wherein each air chamber is in fluid communication with a respective air outlet valve of the plurality of air outlet valves, each air outlet valve is configured to be in fluid communication with corresponding air outlet passageway recessed into the exterior surface of the main housing beneath the diaphragm assembly such that the diaphragm assembly forms a portion of an outer lateral wall of each air outlet passageway apart from each air outlet valve in fluid communication with the respective air outlet passageway, and wherein each of the upper and lower covers includes a plurality of openings, wherein each opening is positioned over and in fluid communication with either a respective air intake valve of the plurality of air intake valves or a respective air outlet valve of the plurality of air outlet valves, wherein each opening is configured to direct airflow either into or out of a respective air chamber in an airflow path parallel to a direction of the reciprocation of each of the respective first, second, third, and fourth diaphragms between the intake position and the compression position.
18. 18 . The pump assembly of claim 17 , wherein each air intake passageway defines an aperture extending through the main housing.
19. 19 . The pump assembly of claim 18 , wherein the air outlet valve for the air chamber of the first diaphragm and the air outlet valve for the air chamber of the third diaphragm are each in fluid communication with a first air outlet passageway recessed into the first and third planes of the exterior surface of the main housing between the diaphragm assembly and the main housing to provide an air outlet flow path beneath the diaphragm assembly, wherein the air outlet valve for the air chamber of the second diaphragm and the air outlet valve for the air chamber of the fourth diaphragm are each in fluid communication with a second air outlet passageway recessed into the second and fourth planes of the exterior surface of the main housing between the diaphragm assembly and the main housing to provide an air outlet flow path beneath the diaphragm assembly, wherein each of the first and second air outlet passageways is configured to provide fluid communication to the fluid outlet from two air chambers orthogonally positioned relative to each other.
20. 20 . A pump assembly comprising: a housing including a main housing, an upper cover, a lower cover, a fluid outlet and an interior volume open to the surrounding environment through open ends of the main housing, wherein a fluid flow is drawn into the interior volume of the main housing through the open ends of the main housing; a motor supported by the main housing, the motor including a drive shaft rotatable about a drive shaft axis; a crankshaft coupled to the drive shaft for rotation by the drive shaft; a diaphragm assembly supported by the housing and including a first, second, third, and fourth diaphragm, wherein the main housing and diaphragm assembly are configured such that each of the first, second, third, and fourth diaphragms is fluidly connected with the interior volume of the main housing to receive the fluid flow drawn into the interior volume of the main housing; a first connecting rod coupled to the crankshaft and to the first diaphragm and the second diaphragm, the first connecting rod configured to reciprocate along a first connecting rod axis in response to rotation of the crankshaft to move the first diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the second diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the first diaphragm; and a second connecting rod coupled to the crankshaft and to the third diaphragm and the fourth diaphragm, the second connecting rod configured to reciprocate along a second connecting rod axis that is not parallel to the first connecting rod axis in response to rotation of the crankshaft to move the third diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet and to move the fourth diaphragm between an intake position and a compression position to pump the fluid flow drawn into the interior volume of the main housing through the fluid outlet out of phase with the third diaphragm, wherein the second connecting rod axis is offset from the first connecting rod axis in a direction along the drive shaft axis, wherein the first diaphragm is positioned along a first plane of the main housing, the second diaphragm is positioned along a second plane of the main housing spaced apart from and parallel to the first plane, the third diaphragm is positioned along a third plane of the main housing orthogonal to the first and second planes, and the fourth diaphragm is positioned along a fourth plane of the main housing spaced apart from and parallel to the third plane, wherein the first, second, third, and fourth diaphragms define a diaphragm assembly positioned between an exterior surface of the main housing and an interior surface of each of the upper and lower covers, the diaphragm assembly further including a plurality of air intake valves and a plurality of air outlet valves, wherein each diaphragm of the diaphragm assembly is associated with an aperture provided in the main housing, wherein the diaphragm assembly has a main body integrally formed as a single piece of material, wherein each diaphragm of the diaphragm assembly, each air intake valve of the plurality of air intake valves, and each air outlet valve of the plurality of air outlet valves is integrally formed with the single piece of material, wherein each of the upper and lower covers includes a plurality of recesses each aligned with a respective aperture in the main housing and an associated diaphragm, wherein each pair of aligned recesses and diaphragms defines an air chamber therebetween, wherein each air chamber is in fluid communication with a respective air intake valve of the plurality of air intake valves, each air intake valve configured to be in fluid communication with a corresponding air intake passageway formed in the main housing, and wherein each air chamber is in fluid communication with a respective air outlet valve of the plurality of air outlet valves, each air outlet valve is configured to be in fluid communication with a corresponding air outlet passageway recessed into the exterior surface of the main housing beneath the diaphragm assembly, wherein the main housing, diaphragm assembly, and upper and lower covers are configured such that the diaphragm assembly forms a portion of an outer lateral wall of each air outlet passageway apart from each air outlet valve in fluid communication with the respective air outlet passageway.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a national phase of International Patent Application No. PCT/CA2020/000138, filed on Dec. 11, 2020, which claims priority to U.S. Provisional Patent Application No. 62/946,907, filed Dec. 11, 2019, the entire content of which is incorporated herein by reference. FIELD The present disclosure relates to pneumatic pumps and more particularly to diaphragm pumps. BACKGROUND In many industries, such as comfort, aerospace, automotive, and furniture, there is a need for an effective way to generate air pressure to power pneumatic devices, such as lumbar supports, massage assemblies, and the like. One way to generate air pressure is a diaphragm pump. A diaphragm pump is a positive displacement pump that uses a combination of the reciprocating action of a flexible diaphragm and one-way valves to pump a fluid. SUMMARY The present disclosure provides, in one aspect, a pump assembly including a housing with an air inlet and an air outlet, a motor supported by the housing, the motor including a drive shaft rotatable about a drive shaft axis, a first plurality of diaphragms supported by the housing, the first plurality of diaphragms positioned along a first plane, and a second plurality of diaphragms supported by the housing, the second plurality diaphragms positioned along a second plane, the second plane spaced apart from the first plane. Rotation of the drive shaft is operable to move each diaphragm of the first plurality of diaphragms and each diaphragm of the second plurality of diaphragms from an intake position to a compression position to pump a fluid from the air inlet through the air outlet. The present disclosure provides, in another aspect, a pump assembly including a housing having an air inlet and an air outlet, a motor supported by the housing, the motor including a drive shaft rotatable about a drive shaft axis, a first diaphragm supported by the housing, the first diaphragm defining a first plane, a second diaphragm supported by the housing, the second diaphragm defining a second plane, the second plane spaced apart from the first plane, a crankshaft coupled to the drive shaft for co-rotation with the drive shaft about the drive shaft axis, a first connecting rod coupled to the crankshaft and to the first diaphragm, the first connecting rod configured to reciprocate along a first connecting rod axis in response to rotation of the crankshaft to move the first diaphragm between an intake position and a compression position, and a second connecting rod coupled to the crankshaft and to the second diaphragm, the second connecting rod configured to reciprocate along a second connecting rod axis in response to rotation of the crankshaft to move the second diaphragm between and intake position and a compression position. The present disclosure provides, in another aspect, a pump assembly including a housing with an air inlet and an air outlet, a motor supported by the housing, the motor including a drive shaft rotatable about a drive shaft axis, a first plurality of diaphragms supported by the housing, the first plurality of diaphragms positioned along a first plane, and a second plurality of diaphragms supported by the housing, the second plurality diaphragms positioned along a second plane. The second plane is spaced apart from the first plane. Rotation of the drive shaft is operable to move each diaphragm of the first plurality of diaphragms and each diaphragm of the second plurality of diaphragms from an intake position to a compression position to pump a fluid from the air inlet through the air outlet. Movement of the first plurality of diaphragms and the second plurality of diaphragms produces four air pulses through the air outlet per revolution of the drive shaft. Other aspects of the disclosure will become apparent by consideration of the detailed description and accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a pump assembly according to an embodiment of the present disclosure. FIG. 2 is a schematic illustration of a pneumatic system according to the present disclosure, including the pump assembly of FIG. 1. FIG. 3 is an exploded view of the pump assembly of FIG. 1. FIG. 4 is a perspective cross-sectional view of the pump assembly of FIG. 1 taken across line 4-4. FIG. 5 is a perspective cross-sectional view of the pump assembly of FIG. 1 taken across line 5-5. FIG. 6 is another perspective cross-sectional view of the pump assembly of FIG. 1 taken across line 6-6. FIG. 7 is an exploded perspective view illustrating a pump assembly according to another embodiment of the present disclosure. FIG. 8 is a perspective view of the pump assembly of FIG. 7, with a side cover removed. FIG. 9 is another perspective view of the pump assembly of FIG. 7, with an opposite side cover removed. FIG. 10 is a perspective view of a pump assembly according to another embodiment of the present disclosure. FIG. 11 is an exploded