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DE-102024132849-A1 - Sine pump with gate valve and manufacturing process

DE102024132849A1DE 102024132849 A1DE102024132849 A1DE 102024132849A1DE-102024132849-A1

Abstract

A shut-off valve (38) for a pump comprises: a rotor contact area (48) designed to bear against a wave-shaped rotor collar of the pump, the rotor contact area (48) comprising: lateral rotor contact surfaces (50), which are designed to rest against side surfaces of the rotor collar, and an upper rotor contact surface (52) which is designed to rest against a radially outwardly facing outer surface of the rotor collar, wherein the lateral rotor contact surfaces (50) are each designed as conically rounded surfaces, wherein a first radius of curvature (R 1 ) in a lower region of the lateral rotor contact surfaces (50), which is away from the upper rotor contact surface (52), is smaller than a second radius of curvature (R 2 ) in an upper region of the lateral rotor contact surfaces (50), which is adjacent to the upper rotor contact surface (52).

Inventors

  • Frank Dambacher

Assignees

  • WATSON MARLOW GMBH MASOSINE

Dates

Publication Date
20260513
Application Date
20241111

Claims (12)

  1. A locking gate (38) for a pump (10), comprising: a rotor contact area (48) designed to bear against a corrugated rotor collar (18) of the pump (10), wherein the rotor contact area (48) comprises: lateral rotor contact surfaces (50) designed to bear against side surfaces of the rotor collar (18), and an upper rotor contact surface (52) designed to bear against a radially outwardly projecting outer surface of the rotor collar (18), wherein the lateral rotor contact surfaces (50) are each designed as conically rounded surfaces, wherein a first radius of curvature ( R1 ) in a lower region of the lateral rotor contact surfaces (50), which is away from the upper rotor contact surface (52), is smaller than a second radius of curvature ( R2 ) in an upper region of the lateral rotor contact surfaces (50), which is adjacent to the upper rotor contact surface (52).
  2. Pump (10) with a rotor (14) rotatable about an axis of rotation, comprising a rotor hub (16) and a wave-shaped rotor collar (18) extending radially from the rotor hub (16), a pump housing (12) which, together with the rotor (14), forms a pump chamber (20) connecting a first inlet/outlet chamber with a second inlet/outlet chamber, and a locking device (22) which is arranged between the first inlet/outlet chamber and the second inlet/outlet chamber and which comprises a locking slide (38) which opens the pump chamber mer (20) in the axial direction on both sides of the rotor collar (18), wherein the locking slide (38) has lateral rotor contact surfaces (50) which each bear against side surfaces of the rotor collar (18), and has an upper rotor contact surface (52) which bears against a radially outwardly facing surface of the rotor collar (18), wherein the lateral rotor contact surfaces of the locking slide (38) are each designed as conically rounded surfaces, wherein a first radius of curvature (R 1 ) of the lateral rotor contact surfaces (50) in a radially inner region, which is close to the rotor hub (16), is smaller than a second radius of curvature (R 2 ) of the lateral rotor contact surfaces (50) in a radially outer region, which is adjacent to the upper rotor contact surface (52).
  3. Pump (10) after Claim 2 , wherein the upper rotor contact surface (52) of the locking slide (38) is a concave curved surface, with a third radius of curvature (R 3 ) which corresponds to the radius of curvature of the radially outwardly facing surface of the rotor collar (18).
  4. pump (10) after one of the Claims 2 or 3 , wherein a lower rotor contact surface (54) of the locking slide (38) is in contact with a radially outwardly facing outer surface of the rotor hub (16) and wherein the lower rotor contact surface (54) of the locking slide (38) is a concavely curved surface, with a fourth radius of curvature (R 4 ) which corresponds to the radius of curvature of the radially outwardly facing outer surface of the rotor hub (16).
  5. pump (10) after one of the Claims 2 until 4 , wherein the locking slide (38) is made of a plastic material and comprises an outer shell (42) and reinforcing ribs (44) such that cavities (46) are formed in the locking slide (38).
  6. Pump (10) after Claim 5 , wherein the outer shell (42) and/or the reinforcing ribs (44) of the locking slide (38) are made of a plastic material containing glass fibers, such as glass fiber reinforced polyamide.
  7. pump (10) after one of the Claims 4 or 5 , wherein at least some of the cavities (46) of the locking valve (38) are filled with a filling material.
  8. Method for manufacturing a locking valve (38) for a sine pump (10), comprising: providing a glass fiber reinforced plastic material suitable for processing by injection molding; Manufacturing the locking slide (38) by injection molding the glass fiber reinforced plastic material, wherein the locking slide (38) has a rotor contact area (48) comprising: lateral rotor contact surfaces (50) designed to abut side surfaces of a rotor collar (18), and an upper rotor contact surface (52) designed to abut a radially outwardly facing surface of the rotor collar (18), wherein the lateral rotor contact surfaces (50) are each designed as conically rounded surfaces, wherein a first radius of curvature (R 1 ) of the lateral rotor contact surfaces (50) in a lower region, which is away from the upper rotor contact surface (52), is smaller than a second radius of curvature (R 2 ) of the lateral rotor contact surfaces (50) in an upper region, which is adjacent to the upper rotor contact surface (52).
  9. Procedure according to Claim 1 , wherein the step of manufacturing the locking slide (38) by injection molding the glass fiber reinforced plastic material comprises manufacturing a locking slide (38) with an outer shell (42) and with at least one reinforcing rib (44) located inside the outer shell (42) such that cavities (46) are formed inside the outer shell (42), and wherein the method further comprises: filling the cavities (46) in the locking slide (38) with a filling material.
  10. A method for manufacturing a gate valve (38) for a sine pump (10), comprising: providing a plastic material suitable for processing by injection molding, wherein the plastic material is approved for food-grade applications when processed by injection molding; manufacturing the gate valve (38) by injection molding the plastic material.
  11. Procedure according to Claim 10 , where the plastic material is a glass fiber reinforced plastic material.
  12. Procedure according to one of the Claims 10 or 11 , wherein the step of manufacturing the locking slide (38) by injection molding comprises manufacturing a locking slide (38) with an outer shell (42) and with at least one reinforcing rib (44) located inside the outer shell (42) such that cavities (46) are formed inside the outer shell (42), and wherein the method further comprises: filling the cavities (46) in the locking slide (38) with a filling material.

Description

Background of the invention The present invention relates to a sine pump and a manufacturing method for a shut-off valve for a sine pump. Sine pumps are characterized by a rotor having a radially extending, corrugated or sinusoidal circumferential collar. A common inlet and outlet chamber is provided in a pump housing, in which a shut-off device is formed that encompasses the rotor collar and prevents backflow of the fluid to be pumped within the common inlet and outlet chamber. This shut-off device can comprise a shut-off valve that is mounted on the rotor collar and has a slot through which the rotor collar slides. These types of slides are typically milled from a plastic blank. For sealing the pump chamber, it is essential to achieve the best possible (fluid-tight) contact between the slide and the rotor collar. However, the milled slides only allow for the production of flat contact surfaces. It is therefore an object of the present invention to provide an improved shut-off device for a sine pump and an improved manufacturing process, which further reduces backflow of the fluid being pumped. It is a further object of the present invention to provide a manufacturing process for a shut-off valve that can be used in pumps in the food industry. These tasks are solved by a gate valve according to claim 1, by a pump according to claim 2 and by a manufacturing method according to claim 8 or claim 10. According to one embodiment, a shut-off valve for a pump, such as a sine wave pump, comprises a rotor contact area designed to bear against a corrugated rotor collar of the pump. The shut-off valve can be a substantially cuboid component with a slot in one side, forming the rotor contact area and designed to be placed onto the rotor collar. The rotor contact area comprises lateral rotor contact surfaces, designed to abut the side surfaces of the rotor collar, and an upper rotor contact surface, designed to abut a radially outward-facing surface of the rotor collar. The lateral and upper rotor contact surfaces thus form the aforementioned slot in the sealing slide, which can be placed on the rotor collar and, during pump operation, is in contact with the rotor collar to seal a pump chamber and prevent backflow of the pumped fluid from an outlet area back to an inlet area. The lateral rotor contact surfaces are each designed as conically rounded surfaces, with a first radius of curvature in a lower region of the lateral rotor contact surfaces, located away from the upper rotor contact surface, being smaller than a second radius of curvature in an upper region of the lateral rotor contact surfaces, adjacent to the upper rotor contact surface. This allows for a large contact area between the lateral rotor contact surfaces and the corrugated rotor collar, since, in the radially outward-extending corrugated rotor collar, a radially inner region has a shorter circumference and thus a greater curvature of the corrugation than a radially outer region, where the corrugation is stretched over a longer circumference. According to a further embodiment, a pump is provided with a rotor rotatable about an axis of rotation, comprising a rotor hub and a wave-shaped rotor collar extending radially from the rotor hub; a pump housing which, together with the rotor, forms a pump chamber connecting a first inlet/outlet chamber to a second inlet/outlet chamber; and a locking device arranged between the first inlet/outlet chamber and the second inlet/outlet chamber, comprising a locking slide that seals the pump chamber axially on both sides of the rotor collar. Such a sinusoidal pump can be used particularly for pumping foodstuffs, since the pump chamber is easy to clean and since, by positioning the pump chamber between a radially outer side of the rotor and a pump housing, contamination of the pumped fluid, for example by lubricating oil or by abrasive particles from the drive shaft or the pump's drive unit, can be avoided. The locking slide has lateral rotor contact surfaces which each rest against side surfaces of the rotor collar, and the locking slide also has an upper rotor contact surface which rests against a radially outwardly pointing outer surface of the rotor collar. The lateral rotor contact surfaces of the shut-off valve are each designed as conically rounded surfaces, with a first radius of curvature of the lateral rotor contact surfaces in a radially inner region, located near the rotor hub, being smaller than a second radius of curvature of the lateral rotor contact surfaces in a radially outer region, adjacent to the upper rotor contact surface. This ensures full-surface contact across the entire radial extent of the rotor collar, so that the shut-off valve effectively prevents unwanted backflow of fluid against the pump's delivery direction. According to further embodiments, the upper rotor contact surface of the locking slide can be a concave curved surface with a third radius of curvature corresponding to the radius