Drainable multi-diaphragm pump

Abstract

A drainable multi-diaphragm pump, comprising a pipe connection body (05), an intermediate partition plate (08), a valve seat (14), a diaphragm assembly, and a bearing box (24) connected in sequence. The diaphragm assembly comprises a diaphragm pressing plate (18) and a diaphragm (17) disposed between the diaphragm pressing plate (18) and the valve seat (14). A liquid inlet and a liquid outlet on the pipe connection body (05) are connected to an external pipe via a quick connector (02). The diaphragm (17) is fixed to an eccentric cap via a circular hoop (20). A liquid inlet chamber (C), a liquid outlet chamber (E), and diaphragm chambers (F) are respectively provided between the pipe connection body (05) and the diaphragm assembly, between the intermediate partition plate (08) and the diaphragm assembly, and between the valve seat (14) and the diaphragm assembly. The valve seat (14) is provided with a one-way valve group, one-way liquid inlet channels (G), and one-way liquid outlet channels (H). The one-way valve group is opened and closed by means of reciprocating motion of the diaphragm (17), enabling liquid to be conveyed. The one-way liquid inlet channels (G) correspond to the diaphragm chambers (F) and are equal in number. Each diaphragm chamber (F) corresponds to two one-way liquid outlet channels (H), and the two one-way liquid outlet channels (H) are respectively located at the top and bottom of the diaphragm chamber (F). The diaphragm pump has a reasonable structure, is capable of quickly discharging air bubbles during operation, and leaves no liquid residue in the pump chamber after operation.

Description

A drainable multi-diaphragm pump Technical Field

[0001] This invention relates to the field of diaphragm pump technology, and more specifically to a multi-element diaphragm pump capable of complete drainage. Background Technology

[0002] Among the similar product structures that have been disclosed so far, the diaphragm pump structures disclosed in Chinese patent (CN202326123 U) and German patent (DE10117531A and DE202006020237U1) adopt an integral outlet valve structure. The outlet valve is located at the center of the pump casing, the inlet valve is arranged in a ring around the outlet valve, the liquid outlet chamber is located at the center of the pump casing, and the liquid inlet chamber is located on the outer ring of the pump casing in the form of an annular groove. During customer use, its shortcomings have been confirmed and criticized. The use of an integrated outlet valve structure necessitates that the outlet chamber be located at the center of the pump casing. The outer diaphragm chamber connects to the outlet chamber near the center of the pump casing. This results in different venting and emptying outcomes for the four diaphragm chambers during operation. The upper diaphragm chamber, with its outlet located at the bottom near the center of the pump casing, can empty as much of the medium as possible after use. However, because the air bubbles are located at the top, far from the center, most of the air cannot be smoothly expelled during the initial pump operation, which typically negatively impacts flow and pressure stability. The lower diaphragm chamber, with its outlet located at the top near the center of the pump casing, allows for rapid expulsion of a large amount of air. However, because the outlet is located at the top of the diaphragm chamber, a significant amount of residual medium remains inside after use and cannot be discharged.

[0003] For example, Chinese patents (CN113195895 A and CN117869261A) use the central position as the inlet chamber. Each diaphragm chamber employs two outlet valves and one inlet valve, arranged in a triangular pattern. The inlet valve is positioned at a point close to the pump casing centerline, while one outlet valve is located at the top of the diaphragm chamber, and the other at the bottom. This allows for the venting and exhaust of the medium within the chamber. While this design solves the venting and residue issues during operation, the requirement for the inlet valve to be centrally located on the pump casing results in the inlet check valve being positioned in a corner of the diaphragm chamber. Furthermore, the sealing surface of the inlet check valve is located within the diaphragm chamber, increasing manufacturing complexity. Additionally, the inlet valve's dimensions cannot be made very large, which can negatively impact the pump's high-speed flow performance.

[0004] Therefore, existing technologies need to be improved to overcome the problems existing in them. Summary of the Invention

[0005] To overcome the shortcomings of existing technologies, a drainable multi-element diaphragm pump is provided to solve the problem of liquid residue remaining in the pump chamber after delivery in existing diaphragm pumps.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a drainable multi-element diaphragm pump, comprising a connecting pipe body, an intermediate partition, a valve seat, a diaphragm assembly, an eccentric shaft assembly, and a bearing housing connected in sequence. The diaphragm assembly includes a diaphragm pressure plate and a diaphragm disposed between the diaphragm pressure plate and the valve seat. The inlet and outlet of the connecting pipe body are connected to an external pipeline through quick connectors. The diaphragm is driven by the eccentric shaft assembly, which is installed inside the bearing housing.

[0007] A liquid inlet chamber is provided between the connecting pipe and the intermediate partition plate; a liquid outlet chamber is provided between the intermediate partition plate and the valve seat; a diaphragm chamber for reciprocating diaphragm movement is provided between the valve seat and the diaphragm assembly; a discharge hole communicating with the liquid outlet on the connecting pipe is provided at the bottom of the intermediate partition plate; the valve seat is provided with a one-way valve assembly, a one-way liquid inlet channel and a one-way liquid outlet channel cooperating with the one-way valve assembly; the one-way valve assembly opens and closes through the reciprocating movement of the diaphragm, and liquid is transported through the opening and closing of the one-way valve assembly.

[0008] The one-way liquid inlet channels are correspondingly provided with the same number of diaphragm chambers. Each diaphragm chamber has two one-way liquid outlet channels. The two one-way liquid outlet channels are located at the top and bottom of the diaphragm chamber, respectively, and the center line connecting the two one-way liquid outlet channels is parallel to the longitudinal axis of the pump head. Gas and liquid are discharged through the two one-way liquid outlet channels, respectively.

[0009] Furthermore, the intermediate partition plate is provided with flow channels connecting the liquid inlet chamber and the diaphragm chamber, and the number of flow channels matches the number of the diaphragm chambers.

[0010] Furthermore, the one-way valve assembly includes an inlet one-way valve and an outlet one-way valve. The number of inlet one-way valves matches the number of one-way liquid inlet channels, and the outlet one-way valves are symmetrically arranged along the transverse axis of the pump head.

[0011] Furthermore, there are four unidirectional liquid inlet channels and four diaphragm chambers.

[0012] Furthermore, there are three outlet check valves located on the longitudinal axis, and the four diaphragm chambers located at the center of the longitudinal axis share one outlet check valve.

[0013] Furthermore, four outlet check valves are provided and located on the longitudinal axis, and each outlet check valve can be shared by two diaphragm chambers.

[0014] Furthermore, there are eight outlet check valves, which are arranged symmetrically along the longitudinal axis of the pump casing, with each diaphragm chamber corresponding to two outlet check valves.

[0015] Furthermore, sealing elements are provided between the quick connector and the connecting pipe body, between the connecting pipe body and the intermediate partition plate, and between the intermediate partition plate and the valve seat.

[0016] Furthermore, the diaphragm is fixed to the eccentric shaft assembly by a circular clamp, the eccentric shaft assembly is installed in the bearing housing, and the diaphragm reciprocates due to the rotation of the eccentric shaft assembly.

[0017] Furthermore, the diaphragm is installed directly or via a diaphragm support column onto a circular clamp, and then fixed to the eccentric cap at the end of the eccentric shaft assembly via the circular clamp.

[0018] The beneficial effects of this invention due to the use of the above technical solutions are as follows:

[0019] 1. It solves the problem of air bubbles being difficult to expel from the diaphragm chamber, ensuring rapid stabilization of experimental process conditions and guaranteeing the stability of experimental and production processes;

[0020] 2. It solves the problem of residual liquid in the chambers. After operation, each chamber can be fully drained, which greatly facilitates the cleaning process of the equipment.

[0021] 3. The position requirements for the inlet check valve are not strict, and an inlet valve with a larger inlet can be designed, which effectively improves the performance of the pump. Attached Figure Description

[0022] Figure 1 is an exploded view of the structure of the first embodiment of the present invention;

[0023] Figure 2 is a cross-sectional view along the position of the inlet check valve in the first embodiment of the present invention;

[0024] Figure 3 is a cross-sectional view along the outlet check valve position in the first embodiment of the present invention;

[0025] Figure 4 is a schematic diagram of the inlet and outlet connector in the first embodiment of the present invention;

[0026] Figure 5 is a schematic diagram of the front end structure of the connecting pipe in the first embodiment of the present invention;

[0027] Figure 6 is a schematic diagram of the back structure of the connecting pipe in the first embodiment of the present invention;

[0028] Figure 7 is a schematic diagram of the front end structure of the intermediate partition in the first embodiment of the present invention;

[0029] Figure 8 is a schematic diagram of the back structure of the intermediate partition in the first embodiment of the present invention;

[0030] Figure 9 is a schematic diagram of the back structure of the valve seat in the first embodiment of the present invention;

[0031] Figure 10 is a schematic diagram of the front end structure of the valve seat in the first embodiment of the present invention;

[0032] Figure 11 is a schematic diagram of the arrangement of inlet and outlet check valves in the first embodiment of the present invention;

[0033] Figure 12 is a schematic diagram of the inlet check valve and diaphragm chamber in the first embodiment of the present invention;

[0034] Figure 13 is a schematic diagram of the outlet check valve arrangement in the second embodiment of the present invention;

[0035] Figure 14 is a schematic diagram showing the positions of the unidirectional liquid outlet channel and the diaphragm chamber in the second embodiment of the present invention;

[0036] Figure 15 is a schematic diagram of the outlet check valve arrangement in the third embodiment of the present invention;

[0037] Figure 16 is a schematic diagram showing the positions of the unidirectional liquid outlet channel and the diaphragm chamber in the third embodiment of the present invention.

[0038] The reference numerals in the accompanying drawings are as follows: Connector bolt 01, Quick connector 02, Connecting bolt 04, Connecting pipe body 05, Intermediate partition 08, Outlet valve screw (11, 16), Outlet check valve (12, 13), Valve seat 14, Inlet check valve 15, Diaphragm 17, Diaphragm pressure plate 18, Diaphragm support column 19, Circular clamp 20, Screw 21, Eccentric shaft assembly 22, Bearing pressure plate 23, Bearing housing 24, Discharge hole K, Seals (03, 06, 07, 09, 10), Inlet chamber C, Flow channel D, Outlet chamber E, Diaphragm chamber F, One-way inlet channel G, One-way outlet channel H. Detailed Implementation

[0039] To make the technical means, inventive features, objectives and effects of the invention easier to understand, the invention is further described below in conjunction with specific embodiments.

[0040] As shown in Figures 1 to 12, this invention discloses a drainable multi-element diaphragm pump, comprising a connecting pipe body 05, an intermediate partition 08, a valve seat 14, a diaphragm assembly, and a bearing housing 24 connected in sequence. The connecting pipe body 05, the intermediate partition 08, and the valve seat 14 form a three-piece pump chamber structure. The diaphragm assembly includes a diaphragm pressure plate 18 and a diaphragm 17 disposed between the diaphragm pressure plate 18 and the valve seat 14. A quick connector 02 is fixed to the connecting pipe body 05 by connector bolts 01. The intermediate partition 08 and the valve seat 14 are fixed to the bearing housing 24 by connecting bolts 04. The inlet (IN port) and outlet (OUT port) on the connecting pipe body 05 are connected to an external pipeline through the quick connector 02. The diaphragm 17 is driven by an eccentric shaft assembly 22, which is installed inside the bearing housing 24.

[0041] A liquid inlet chamber C is provided between the connector body 05 and the intermediate partition plate 08, formed by machining a groove on the back of the connector body 05. A liquid outlet chamber E is provided between the intermediate partition plate 08 and the valve seat 14, located on the back of the intermediate partition plate 08, thus separating the liquid inlet chamber C and the liquid outlet chamber E through the intermediate partition plate 08. A diaphragm chamber F is provided between the valve seat 14 and the diaphragm assembly for the reciprocating movement of the diaphragm 17. The bottom of the intermediate partition plate 08 has a discharge hole K that communicates with the liquid outlet (OUT port) on the connector body 05, ensuring that there is no liquid accumulation in the liquid outlet chamber E. The valve seat 14 is provided with a one-way valve assembly, a one-way liquid inlet channel G and a one-way liquid outlet channel H that cooperate with the one-way valve assembly. The one-way valve assembly is opened and closed by the reciprocating movement of the diaphragm 17, and the liquid is transported by opening and closing the one-way valve assembly.

[0042] One-way inlet channels G are provided correspondingly to diaphragm chambers F and are the same number. The one-way inlet channels G are evenly distributed on valve seat 14. Each diaphragm chamber F has two one-way outlet channels H. The two one-way outlet channels H are located at the top and bottom of the diaphragm chamber F, respectively, and the center line connecting the two one-way outlet channels H is parallel to the longitudinal axis of the pump casing. Preferably, the two one-way outlet channels H can be set at a position far away from the center of the inlet one-way valve 15, so that gas and liquid can be discharged more fully through the two one-way outlet channels H respectively.

[0043] Specifically, this invention takes four one-way inlet channels (G) and four diaphragm chambers (F) as an example, that is, this embodiment is a four-element diaphragm pump design. The one-way valve group includes an inlet one-way valve 15 and an outlet one-way valve (12, 13). Referring to Figures 11 and 12, in the first embodiment, there can be three outlet one-way valves (12, 13) located on the longitudinal axis of the pump casing. The four diaphragm chambers F are located at the center of the longitudinal axis and share one outlet one-way valve. The size of the shared outlet one-way valve can be larger than the size of the other two outlet one-way valves. It can be connected to the valve seat 14 through the outlet valve screw (11, 16). There are four inlet one-way valves 15 and they are matched with the one-way inlet channels G. The outlet one-way valves (12, 13) are symmetrically arranged along the transverse axis of the pump head. The size of the outlet one-way valves (12, 13) is set according to the pump specifications and usage requirements. The position of the inlet one-way valve 15 is set according to the usage requirements.

[0044] In addition, the middle partition 08 is provided with a flow channel D that connects the liquid inlet chamber C and the liquid outlet chamber E. The number of flow channels D matches the number of diaphragm chambers F. In this embodiment, there are four of them. The four flow channels D are located at the four corners of the liquid inlet chamber C to ensure that there is no gas residue at the top and no liquid accumulation at the bottom of the liquid inlet chamber C.

[0045] To prevent liquid leakage, sealing structures (03, 06, 07, 09, 10) are provided between quick connector 02 and pipe body 05, between pipe body 05 and intermediate partition 08, and between intermediate partition 08 and valve seat 14. These sealing structures (03, 06, 07, 09, 10) can be sealing rings, and their shapes can be set according to the needs of use, as long as they can achieve a sealing effect.

[0046] It should also be noted that the diaphragm 17 can be directly or through the diaphragm support column 19 installed onto the circular clamp 20, evenly distributed. The circular clamp 20 is fixed to the eccentric cap at the end of the eccentric shaft assembly 22 after being locked by the screw 21. The rotation support bearing of the eccentric shaft assembly 22 is fixed in the bearing housing 24 through the bearing pressure plate 23. The eccentric shaft assembly 22 has an eccentric angle. When the eccentric shaft assembly 22 rotates under the drive, it forms the back and forth swing of the eccentric cap, which in turn drives the diaphragm 17 to reciprocate.

[0047] In practical use, when the diaphragm 17 moves backward under drive, liquid enters the inlet chamber C from the inlet channel A at the inlet port. The liquid in inlet chamber C passes through the flow channel D on the intermediate partition 08 that matches the diaphragm chamber F, through the four inlet check valves 15, and through the one-way inlet channel G sealed by the inlet check valves 15 into the diaphragm chamber F. At this time, the outlet check valves (12, 13) are closed. When the diaphragm 17 moves forward, the inlet check valves 15 close, and the liquid... The liquid enters the outlet chamber E through the sealed one-way outlet channel H of the outlet check valve (12,13). After the liquid in the outlet chamber E is collected, it passes through the discharge hole K located at the bottom of the intermediate partition 08 and is discharged into the outlet pipeline through the outlet channel B. The one-way outlet channel H located at the top of the diaphragm chamber F ensures that the gas in the diaphragm chamber F can be discharged quickly, and the flow rate and pressure can be stabilized quickly. The one-way outlet channel H located at the bottom of the diaphragm chamber F ensures that the residual liquid in the diaphragm chamber F can be fully discharged. This achieves the purpose of using the diaphragm pump. Due to the reciprocating motion of the diaphragm 17, the liquid is driven to be drawn in from the inlet and discharged from the outlet.

[0048] In summary, the first embodiment of the present invention provides a drainable multi-component diaphragm pump with a reasonable structure and simple operation. It effectively solves the problem of air bubbles being difficult to expel from the diaphragm chamber F, ensuring rapid stabilization of experimental process conditions. It also solves the problem of residual liquid in the chamber. After operation, each chamber can be fully drained, which greatly facilitates the equipment cleaning process and has extremely high practical value.

[0049] The second embodiment of the present invention also discloses a drainable multi-element diaphragm pump. The second embodiment is basically the same as the first embodiment, the main difference being that, as shown in Figures 13 and 14, there are four outlet check valves (12, 13) arranged on the longitudinal axis. Each outlet check valve (12, 13) can be shared by two diaphragm chambers F. The four outlet check valves (12, 13) are the same size.

[0050] The third embodiment of the present invention also discloses a drainable multi-element diaphragm pump. The third embodiment is basically the same as the first embodiment, except that, as shown in Figures 15 and 16, there are eight outlet check valves (12, 13). These eight outlet check valves (12, 13) are the same size and are arranged symmetrically along the longitudinal axis of the pump casing. Each diaphragm chamber F corresponds to two outlet check valves (12, 13).

[0051] The outlet check valves (12, 13) in this invention are not limited to three, four, or eight. Other suitable quantities can be set according to the specifications of the diaphragm pump and the needs of use. Examples will not be given here.

[0052] The specific embodiments of the invention have been described above. It should be understood that the invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood to be implemented in a manner common to the art; those skilled in the art can make various modifications or alterations within the scope of the claims, and make several simple deductions, variations or substitutions, which do not affect the substantive content of the invention.

Claims

1. A drainable multi-element diaphragm pump, characterized in that: The assembly includes a connecting pipe body (05), an intermediate partition plate (08), a valve seat (14), a diaphragm assembly, an eccentric shaft assembly (22), and a bearing housing (24) connected in sequence. The diaphragm assembly includes a diaphragm pressure plate (18) and a diaphragm (17) disposed between the diaphragm pressure plate (18) and the valve seat (14). The inlet and outlet of the connecting pipe body (05) are connected to an external pipeline through a quick connector (02). The diaphragm (17) is driven by the eccentric shaft assembly (22), which is installed inside the bearing housing (24). A liquid inlet chamber (C) is provided between the connecting pipe body (05) and the intermediate partition plate (08); a liquid outlet chamber (E) is provided between the intermediate partition plate (08) and the valve seat (14); a diaphragm chamber (F) for the reciprocating motion of the diaphragm (17) is provided between the valve seat (14) and the diaphragm (17); a discharge hole (K) communicating with the liquid outlet on the connecting pipe body (05) is provided at the bottom of the intermediate partition plate (08); a one-way valve assembly, a one-way liquid inlet channel (G) and a one-way liquid outlet channel (H) cooperating with the one-way valve assembly are provided on the valve seat (14); the one-way valve assembly is opened and closed by the reciprocating motion of the diaphragm (17); and liquid is transported by opening and closing the one-way valve assembly. The one-way liquid inlet channel (G) is provided in the same number as the diaphragm chamber (F). Each diaphragm chamber (F) has two one-way liquid outlet channels (H). The two one-way liquid outlet channels (H) are located at the top and bottom of the diaphragm chamber (F) respectively, and the center line connecting the two one-way liquid outlet channels (H) is parallel to the longitudinal axis of the pump head. Gas and liquid are discharged through the two one-way liquid outlet channels (H) respectively.

2. The drainable multi-element diaphragm pump according to claim 1, characterized in that: The intermediate partition (08) is provided with a flow channel (D) connecting the liquid inlet chamber (C) and the diaphragm chamber (F), and the number of the flow channels (D) matches the number of the diaphragm chambers (F).

3. The drainable multi-element diaphragm pump according to claim 1, characterized in that: The one-way valve assembly includes an inlet one-way valve (15) and an outlet one-way valve (12, 13). The number of inlet one-way valves (15) matches the number of one-way liquid inlet channels (G). The outlet one-way valves (12, 13) are symmetrically arranged along the transverse axis of the pump head.

4. The drainable multi-element diaphragm pump according to claim 3, characterized in that: The unidirectional liquid inlet channel (G) and the diaphragm chamber (F) are each provided in four places.

5. The drainable multi-element diaphragm pump according to claim 4, characterized in that: There are three outlet check valves (12, 13) located on the longitudinal axis, and the four diaphragm chambers (F) located at the center of the longitudinal axis share one outlet check valve (12, 13).

6. The drainable multi-element diaphragm pump according to claim 4, characterized in that: The outlet check valves (12, 13) are provided in four and located on the longitudinal axis. Each outlet check valve (12, 13) can be shared by two diaphragm chambers (F).

7. The drainable multi-element diaphragm pump according to claim 4, characterized in that: There are eight outlet check valves (12, 13), which are arranged symmetrically along the longitudinal axis. Each diaphragm chamber (F) corresponds to two outlet check valves.

8. The drainable multi-element diaphragm pump according to claim 1, characterized in that: Sealing elements (03, 06, 07, 09, 10) are provided between the quick connector (02) and the connecting pipe (05), between the connecting pipe (05) and the intermediate partition (08), and between the intermediate partition (08) and the valve seat (14).

9. The drainable multi-element diaphragm pump according to claim 1, characterized in that: The diaphragm (17) is fixed to the eccentric shaft assembly (22) by a circular clamp (20). The eccentric shaft assembly (22) is installed in the bearing housing (24). The diaphragm (17) reciprocates due to the rotation of the eccentric shaft assembly (22).

10. The drainable multi-element diaphragm pump according to claim 9, characterized in that: The diaphragm (17) is installed directly or via the diaphragm support column (19) onto the circular clamp (20), and then fixed to the eccentric cap at the end of the eccentric shaft assembly (22) via the circular clamp (20).

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