US-12618401-B1 - Diaphragm assembly and diaphragm pump

US12618401B1US 12618401 B1US12618401 B1US 12618401B1US-12618401-B1

Abstract

A diaphragm assembly includes a piston push block, a diaphragm, a middle piece, a balance wheel seat, and fasteners. The diaphragm includes a diaphragm body with protrusions which protrude toward the middle piece and extends into the balance wheel seat. The piston push block includes a piston head and a piston shaft. The piston head is located on the side of the diaphragm facing away from the middle piece, and the piston shaft extends towards the diaphragm and is embedded in the diaphragm protrusion. The middle piece includes a first through hole, the balance wheel seat includes a balance wheel, and the balance wheel includes an insertion hole for the corresponding diaphragm protrusion to be inserted in. The fastener fixes the piston push block, the diaphragm and the balance wheel seat from the side facing away from the working surface of the diaphragm.

Inventors

Hao Chen
Zhiyong Xu

Assignees

Zhejiang ELE Smart Technology Co., Ltd.

Dates

Publication Date: 20260505
Application Date: 20250109
Priority Date: 20241104

Claims (17)

1 . A diaphragm assembly, comprising: a piston push block; a diaphragm; a middle piece; a balance wheel seat; and at least one fastener, wherein the diaphragm includes a diaphragm body and a diaphragm protrusion formed on the diaphragm body, wherein the diaphragm protrusion protrudes toward the middle piece and extends into the balance wheel seat; wherein the piston push block includes a piston head and a piston shaft arranged on a side of the piston head closer to the diaphragm, the piston head is located on a side of the diaphragm facing away from the middle piece, the piston shaft extends toward the diaphragm, and the piston shaft is embedded in the diaphragm protrusion; wherein the middle piece has a first through hole, wherein the balance wheel seat has a balance wheel, and the balance wheel has an insertion hole for the diaphragm protrusion to be inserted therein; and wherein one of the at least one fasteners is configured to affix the piston push block, the diaphragm and the balance wheel seat from the side facing away from the working surface of the diaphragm.
2 . The diaphragm assembly of claim 1 , wherein the diaphragm protrusion has a second through hole at a distal end thereof, wherein a first threaded hole is provided inside the piston shaft, and wherein the one of the at least one fasteners is configured to pass through the second through hole and connect with the first threaded hole.
3 . The diaphragm assembly of claim 2 , wherein the piston head has a first annular protruding strip arranged around the piston shaft on a side facing the diaphragm.
4 . The diaphragm assembly of claim 2 , wherein the piston shaft has a second annular protruding strip on an outer surface thereof.
5 . The diaphragm assembly of claim 2 , wherein outer diameters of the piston shaft and the diaphragm protrusion gradually decrease along their extension directions.
6 . The diaphragm assembly of claim 1 , wherein the diaphragm protrusion is free of holes, wherein the balance wheel seat further includes a second threaded hole, wherein the one of the at least one fasteners includes a claw structure and screws, the claw structure is configured to pass through the insertion hole and clamp the diaphragm protrusion, and the screws are configured to compress the claw structure toward a center of the claw structure when being screwed into the second threaded hole.
7 . The diaphragm assembly of claim 6 , wherein the piston shaft and the diaphragm protrusion are shaped in an extending direction such that a middle portion is smaller in diameter than a distal end portion.
8 . The diaphragm assembly of claim 1 , wherein a protruding part is formed on a surface of the piston head facing the diaphragm, and a recesses is formed on a surface of the diaphragm body.
9 . The diaphragm assembly of claim 1 , wherein the piston head has two grooves on a front surface configured to allow a tool to clamp the piston push block.
10 . The diaphragm assembly of claim 1 , further comprising a gasket between the middle piece and the balance wheel seat, wherein the gasket has a third through hole configured for the diaphragm protrusion to be inserted.
11 . The diaphragm assembly of claim 1 , wherein a cross section of the diaphragm protrusion is a non-circular shape.
12 . The diaphragm assembly of claim 1 , wherein the diaphragm body includes a disk, and the diaphragm protrusion is located at a position on the disk that deviates from a center of the disk and is closer to an edge of the diaphragm body.
13 . The diaphragm assembly of claim 1 , wherein a thickness of a portion of the diaphragm contacting an edge of the first through hole is greater than a thickness of remaining portions of the diaphragm.
14 . The diaphragm assembly of claim 1 , wherein an edge of the first through hole of the middle piece has a step, and wherein the diaphragm assembly further includes a gasket arranged on the step, wherein the gasket is made of a polytetrafluoroethylene material.
15 . The diaphragm assembly of claim 1 , wherein the diaphragm body and the diaphragm protrusion are integrally formed, and wherein the diaphragm is made of an elastic material.
16 . The diaphragm assembly of claim 1 , wherein the piston push block is made of nylon and glass fiber materials.
17 . A diaphragm pump, comprising: a pump head cover; a piston valve body; an eccentric cam; a motor; and the diaphragm assembly of claim 1 , wherein the eccentric cam is installed in the diaphragm assembly, and the motor is connected to the eccentric cam and configured to drive the eccentric cam to rotate.

Description

BACKGROUND OF THE INVENTION This invention relates to the field of diaphragm pumps, and in particular to a diaphragm assembly and a diaphragm pump employing the diaphragm assembly. The diaphragm is one of the core components of the diaphragm booster pump. The motor of the diaphragm booster pump drives an eccentric cam to rotate, so as to drive the balance wheel seat and the balance wheel on it to swing up and down. The diaphragm is elastically deformed with the swing of the balance wheel, so that the volume of the booster chamber at the working surface of the diaphragm changes. The volume change is used to complete the process of water absorption and drainage. In the related art, the diaphragm of the diaphragm assembly and its related structures have the problem of poor sealing performance. SUMMARY OF THE INVENTION An object of the present invention is to solve at least one aspect of the above-mentioned problems and defects in the related art. In response to the above problems, the present invention provides a diaphragm assembly, which includes a piston push block, a diaphragm, a middle piece, a balance wheel seat, and fasteners, wherein the diaphragm includes a diaphragm body and a protrusion arranged on the diaphragm body, wherein the protrusion protrudes in the direction toward the middle piece and extends into the balance wheel seat; the piston push block includes a piston head and a piston shaft arranged on the side of the piston head closer to the diaphragm, the piston head is located on the side of the diaphragm facing away from the middle piece, the piston shaft extends towards the diaphragm, and the piston shaft is embedded in the corresponding diaphragm protrusion; the middle piece has a first through hole, the balance wheel seat has a balance wheel, and the balance wheel has an insertion hole for the corresponding diaphragm protrusion to be inserted in; and the fastener affixes the piston push block, the diaphragm and the balance wheel seat from the side facing away from the working surface of the diaphragm. In some embodiments, the diaphragm protrusion has a second through hole at its end, a first threaded hole is provided inside the piston shaft, and the fastener is configured to pass through the second through hole and connect with the first threaded hole. In some embodiments, the piston head has a first annular protruding strip arranged around the piston shaft on the side facing the diaphragm. The first annular protruding strip can prevent liquid from entering the diaphragm protrusion from the radial direction of the piston shaft, thereby improving the sealing effect. In some embodiments, the outer side of the piston shaft has a second annular protruding strip, which can prevent liquid from entering the non-working area from the axial direction of the piston shaft, thereby further improving the sealing effect. In some embodiments, the outer diameters of the piston shaft and the diaphragm protrusion gradually decrease along their extension directions. The piston shaft and the diaphragm protrusion are conical in shape in the axial direction, and cooperate with the conical surface of the insertion hole. Under the constraint of the axial force, the conical surface will gradually press the diaphragm to achieve sealing. In some embodiments, the diaphragm protrusion is a structure without holes, the balance wheel seat further includes a second threaded hole, the fastener includes a claw structure and screws, the claw structure is configured to pass through the insertion hole and clamp the diaphragm protrusion, and the screws are configured to compress the claw structure toward the center when being screwed into the second threaded hole. The lack of holes in the diaphragm completely isolates the diaphragm chamber and the motor at the non-working surface to avoid liquid leakage. In addition, since the diaphragm itself has no gaps, it can automatically suck in the medium (fluid) in the absence of the medium, so that the diaphragm pump can run dry for a short period of time. In some embodiments, the piston shaft and the diaphragm protrusion are shaped in an extending direction such that the middle portion is smaller in diameter and the ends are larger in diameter. In some embodiments, a protruding part is formed on the surface of the piston head on the side facing the diaphragm, and a recesses is formed on the surface of the diaphragm body. The protruding part cooperates with the recess and to prevent rotation of the piston push block. In some embodiments, the surface of the piston head has two grooves configured to allow a tool to clamp the piston push block. In some embodiments, a gasket is provided between the middle piece and the balance wheel seat, and a third through hole is provided on the gasket for the diaphragm protrusion to be inserted. In some embodiments, the cross section of the diaphragm protrusion is a non-circular cross section. In some embodiments, the diaphragm body comprises a disk,