Low-pulsation diaphragm pump

Abstract

The utility model provides a low-pulsation diaphragm pump, and relates to the technical field of diaphragm pumps. The low-pulsation diaphragm pump comprises a pump cavity shell, a pump body, a driving mechanism, a suction buffer diaphragm and a discharge buffer diaphragm. A suction buffer cavity and a discharge buffer cavity are formed in the pump cavity shell, and the suction buffer cavity is communicated with the discharge buffer cavity; the pump cavity shell is connected with the pump cavity shell; the driving mechanism is connected with the pump body, and the driving mechanism is used for driving a fluid medium to enter the discharge buffer cavity from the suction buffer cavity; the suction buffer diaphragm is connected into the suction buffer cavity, and the suction buffer diaphragm provides buffer for a fluid medium entering the suction buffer cavity; the discharge buffer membrane is connected into the discharge buffer cavity and provides buffer for the fluid medium entering the discharge buffer cavity. According to the invention, the pulsation of the fluid medium can be reduced, the noise is reduced, the space occupation is reduced, and the integration level is high.

Description

Technical Field

[0001] This application relates to the technical field of diaphragm pumps, and in particular to a low-pulsation diaphragm pump. Background Technology

[0002] A diaphragm pump uses a drive mechanism to drive the diaphragm in reciprocating motion, changing the pump chamber volume to create negative pressure to draw in the fluid medium, and then discharges the fluid medium through positive pressure. In the field of diaphragm pumps, the periodic reciprocating motion of the diaphragm results in periodic fluid intake and discharge, thus generating flow and pressure pulsations. These pulsations can easily lead to wear on components of the transmission system, generate noise and vibration, cause additional energy loss, and reduce the delivery flow rate. High-pressure pulsations can also produce small bubbles or foam, affecting the transmission medium. Related technologies generally employ dual-head or multi-head pumps operating alternately, or add pulsation dampers; however, this often significantly increases the physical space occupied by the diaphragm pump. Utility Model Content

[0003] In order to reduce fluid pulsation, noise, space occupation and high integration, this application provides a low-pulsation diaphragm pump.

[0004] This application provides a low-pulsation diaphragm pump, which adopts the following technical solution:

[0005] A low-pulsation diaphragm pump, comprising:

[0006] A pump chamber housing, wherein an intake buffer chamber and an exhaust buffer chamber are provided inside the pump chamber housing, and the intake buffer chamber and the exhaust buffer chamber are in communication;

[0007] Pump body, the pump chamber housing and the pump body are connected;

[0008] A drive mechanism connected to the pump body, the drive mechanism being used to drive the fluid medium from the suction buffer chamber into the discharge buffer chamber;

[0009] An inhalation buffer diaphragm is connected to the inhalation buffer chamber and provides buffering for the fluid medium entering the inhalation buffer chamber.

[0010] A discharge buffer diaphragm is connected to the discharge buffer chamber, and the discharge buffer diaphragm provides buffering for the fluid medium entering the discharge buffer chamber.

[0011] By adopting the above technical solution, both the suction buffer diaphragm and the discharge buffer diaphragm can undergo elastic deformation. The suction buffer diaphragm can buffer the fluid medium entering the suction buffer chamber, thereby effectively reducing flow and pressure pulsations during the suction process. The discharge buffer diaphragm can buffer the fluid medium entering the discharge buffer chamber, further reducing pulsations during the discharge process. The combined action of the suction and discharge buffer diaphragms reduces pulsations during diaphragm pump operation, reduces wear, noise, and vibration of system components, and improves the stability of the delivery flow rate.

[0012] Optionally, the pump chamber housing includes a valve upper plate and an upper cover, the valve upper plate and the upper cover being detachably connected, and the valve upper plate and the upper cover clamping the edge of the suction buffer diaphragm.

[0013] By adopting the above technical solution, the detachable connection design of the valve upper plate and the upper cover facilitates the installation and maintenance of the suction buffer diaphragm. The valve upper plate and the upper cover clamp the edge of the suction buffer diaphragm, which can ensure that the suction buffer diaphragm is stably fixed during operation, reducing the possibility of displacement or detachment of the suction buffer diaphragm during operation, thereby effectively ensuring the buffering effect of the fluid medium in the suction buffer chamber and reducing flow and pressure pulsation.

[0014] Optionally, the pump chamber housing further includes a support column, which is connected to the upper valve plate. The support column is located inside the suction buffer chamber, and the support column and the upper cover are located on both sides of the suction buffer diaphragm. The support column is used to support the suction buffer diaphragm.

[0015] By adopting the above technical solution, the support column is set in the suction buffer chamber and provides support for the suction buffer diaphragm. This can effectively improve the situation where the suction buffer diaphragm is damaged due to excessive force during operation, increase the service life of the suction buffer diaphragm, and thus ensure that the suction buffer diaphragm stably provides a buffering effect for the fluid medium entering the suction buffer chamber.

[0016] Optionally, the pump chamber housing further includes a lower shell, which is detachably connected to the upper valve plate, and the lower shell and the upper valve plate clamp the edge of the discharge buffer diaphragm.

[0017] By adopting the above technical solution, the lower shell and the upper valve plate are detachably connected, which facilitates the installation and maintenance of the discharge buffer diaphragm. The lower shell and the upper valve plate clamp the edge of the discharge buffer diaphragm, ensuring that the discharge buffer diaphragm is stably fixed during operation.

[0018] Optionally, a support rib is connected to the upper plate of the valve, and multiple support ribs are provided, with the multiple support ribs connected to the outer wall of the suction buffer chamber.

[0019] By adopting the above technical solution, the setting of the support rib plate can enhance the structural strength of the suction buffer chamber and improve the situation where the suction buffer chamber is deformed due to pressure changes in the suction buffer chamber during the operation of the diaphragm pump.

[0020] Optionally, a damping chamber is provided inside the lower shell, and an elastic element is accommodated inside the damping chamber, the elastic element abutting against the discharge buffer diaphragm.

[0021] By adopting the above technical solution, the elastic element in the damping chamber abuts against the discharge buffer diaphragm, which can buffer the movement of the discharge buffer diaphragm, effectively reducing the vibration and impact caused by pressure changes during the discharge of fluid medium, and helping to reduce pressure pulsation when the diaphragm pump is working.

[0022] Optionally, the lower shell is provided with small air holes, which connect the damping chamber to the outside.

[0023] By adopting the above technical solution, if the small vent is not provided, the downward movement of the discharge buffer diaphragm will cause a small amount of gas in the damping chamber to escape from the installation gap, resulting in the discharge buffer diaphragm being sucked in and sinking. The small vent connects the damping chamber to the outside, ensuring that the discharge buffer diaphragm will not be sucked in and sink. Furthermore, when the discharge buffer diaphragm moves, it allows gas inside the damping chamber to be discharged to the outside through the small vent, or allows gas from the outside to enter the damping chamber through the small vent, thereby slowing down the movement of the discharge buffer diaphragm and ensuring its stable operation.

[0024] Optionally, the pump chamber housing further includes a lower valve plate, which is detachably connected to the upper valve plate. The drive mechanism includes a valve disc, which is clamped by the upper valve plate and the lower valve plate. The valve disc allows the fluid medium in the suction buffer chamber to flow into the discharge buffer chamber.

[0025] By adopting the above technical solution, the lower valve plate and the upper valve plate are detachably connected, which facilitates the installation and maintenance of the valve disc. The upper and lower valve plates clamp the valve disc, improving the stability of the valve disc installation.

[0026] Optionally, the drive mechanism further includes a motor, an eccentric wheel, a connecting rod, and a diaphragm. The motor body is connected to the pump body, the eccentric wheel is connected to the motor output shaft, the connecting rod is sleeved on the outside of the eccentric wheel, and the diaphragm is connected to the connecting rod. The diaphragm is installed between the pump chamber housing and the pump body. The motor drives the diaphragm to reciprocate through the eccentric wheel and the connecting rod, so that the fluid medium enters the discharge buffer chamber from the suction buffer chamber.

[0027] By adopting the above technical solution, the motor drives the eccentric wheel to rotate, and the eccentric wheel drives the diaphragm to reciprocate through the connecting rod, thereby allowing the fluid medium to enter the discharge buffer chamber from the suction buffer chamber, thus realizing the transportation of the fluid medium.

[0028] Optionally, the pump body includes a support shell and an end plate, which are detachably connected; the drive mechanism further includes a first bearing and a second bearing, the first bearing being disposed between the connecting rod and the eccentric wheel, and the second bearing being disposed between the end plate and the output shaft of the motor.

[0029] By adopting the above technical solution, the first bearing reduces wear between the eccentric wheel and the connecting rod, while the second bearing provides support for the motor's output shaft, improving the stability of the motor's output shaft rotation. The support housing and end plate are detachably connected, facilitating the installation and removal of the second bearing from the motor's output shaft.

[0030] In summary, this application includes at least one of the following beneficial effects:

[0031] 1. The suction buffer diaphragm can provide a buffering effect for the fluid medium entering the suction buffer chamber, and the discharge buffer diaphragm can provide a buffering effect for the fluid medium entering the discharge buffer chamber, thereby effectively reducing flow and pressure pulsation, reducing wear, noise and vibration of system components, and improving the stability and reliability of fluid medium transmission;

[0032] 2. The elastic element abuts against the discharge buffer diaphragm, further enhancing the buffering effect on the fluid medium in the discharge buffer chamber. At the same time, the small pores improve the problem of gas leakage in the damping chamber causing the discharge buffer diaphragm to sink, ensuring the continuous effectiveness of the buffering function.

[0033] 3. The pump housing integrates the suction buffer chamber and the discharge buffer chamber into one unit, and achieves efficient delivery of fluid medium through the drive mechanism. While reducing pulsation, it maintains a compact structure and can effectively reduce space occupation. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the overall structure of the low-pulsation diaphragm pump according to an embodiment of this application;

[0035] Figure 2 This is a cross-sectional structural diagram of the low-pulsation diaphragm pump according to an embodiment of this application;

[0036] Figure 3 This is a partial structural schematic diagram of the low-pulsation diaphragm pump according to an embodiment of this application;

[0037] Figure 4 This is an exploded structural diagram of a low-pulsation diaphragm pump according to an embodiment of this application.

[0038] Explanation of reference numerals in the attached drawings: 1. Pump chamber housing; 11. Upper valve plate; 111. Connecting channel; 12. Upper cover; 13. Lower valve plate; 14. Lower shell; 141. Damping chamber; 142. Small vent; 15. Support column; 16. Suction buffer chamber; 17. Discharge buffer chamber; 18. Support rib; 19. Elastic element; 2. Pump body; 21. Support shell; 22. End plate; 3. Drive mechanism; 31. Motor; 32. Eccentric wheel; 33. Connecting rod; 34. Diaphragm; 341. Diaphragm chamber; 35. Valve plate; 351. Connecting plate; 352. First diaphragm; 353. Second diaphragm; 36. First bearing; 37. Second bearing; 4. Inlet; 5. Outlet; 6. Suction buffer diaphragm; 7. Discharge buffer diaphragm. Detailed Implementation

[0039] The following combination Figures 1 to 4 This application will be described in further detail.

[0040] This application provides a low-pulsation diaphragm pump.

[0041] refer to Figure 1 and Figure 2 The low-pulsation diaphragm pump includes a pump housing 1, a pump body 2, a drive mechanism 3, an inlet 4, and an outlet 5. The pump body 2 includes a support shell 21 and an end plate 22, which are detachably connected by bolts. The end plate 22 is located on the end side of the support shell 21.

[0042] refer to Figure 2 and Figure 3 The drive mechanism 3 includes a motor 31, an eccentric wheel 32, a connecting rod 33, a diaphragm 34, a first bearing 36, and a second bearing 37. The motor 31 is fixedly connected to the support housing 21, and the second bearing 37 is connected inside the support housing 21. The output shaft of the motor 31 passes through the second bearing 37. The eccentric wheel 32 is sleeved on the output shaft of the motor 31 and is located inside the support housing 21. The first bearing 36 is sleeved on the outside of the eccentric wheel 32. The connecting rod 33 is sleeved on the outside of the first bearing 36, and the diaphragm 34 is fixedly connected to the connecting rod 33. When the motor 31 is started, the motor 31 can drive the diaphragm 34 to reciprocate through the eccentric wheel 32 and the connecting rod 33.

[0043] refer to Figure 2 and Figure 4The pump housing 1 includes an upper valve plate 11, an upper cover 12, and a lower valve plate 13. The upper cover 12 is located on the top side of the upper valve plate 11, and the lower valve plate 13 is located on the bottom side of the upper valve plate 11. The upper cover 12, the upper valve plate 11, the lower valve plate 13, and the support shell 21 are detachably connected by bolts. A diaphragm 34 is located between the lower valve plate 13 and the support shell 21, and the lower valve plate 13 and the support shell 21 hold the diaphragm 34. A valve plate 35 is located between the upper valve plate 11 and the lower valve plate 13, and the upper valve plate 11 and the lower valve plate 13 hold the valve plate 35. The bolt connection allows for easy installation and removal of the diaphragm 34 and the valve plate 35.

[0044] refer to Figure 2 The upper valve plate 11 is internally provided with an intake buffer chamber 16, an exhaust buffer chamber 17, and a connecting channel 111. The inlet 4 is connected to the intake buffer chamber 16, and the outlet 5 is connected to the exhaust buffer chamber 17. A diaphragm cavity 341 is formed between the diaphragm 34, the lower valve plate 13, and the upper valve plate 11. The valve plate 35 is located within the diaphragm cavity 341, and the intake buffer chamber 16, the diaphragm cavity 341, the connecting channel 111, and the exhaust buffer chamber 17 are sequentially connected. When the diaphragm 34 reciprocates, the valve plate 35 allows the fluid medium to enter the diaphragm cavity 341 unidirectionally from the intake buffer chamber 16, and also allows the fluid medium to enter the connecting channel 111 unidirectionally from the diaphragm cavity 341, thereby realizing the flow of the fluid medium from the intake buffer chamber 16 into the exhaust buffer chamber 17.

[0045] refer to Figure 3 and Figure 4 The valve plate 35 includes a connecting plate 351, a first partition 352 and a second partition 353. The first partition 352 and the second partition 353 are both fixedly connected to the connecting plate 351. The first partition 352 can open or close the communication between the suction buffer chamber 16 and the diaphragm chamber 341. The second partition 353 can open or close the communication between the diaphragm chamber 341 and the communication channel 111.

[0046] refer to Figure 2 and Figure 3 When the diaphragm 34 moves downward, the pressure inside the diaphragm cavity 341 causes the first diaphragm 352 and the second diaphragm 353 to move downward. The first diaphragm 352 opens the connection between the suction buffer cavity 16 and the diaphragm cavity 341, while the second diaphragm 353 closes the connection between the diaphragm cavity 341 and the connecting channel 111. At this time, the fluid medium in the suction buffer cavity 16 flows into the diaphragm cavity 341. When the diaphragm 34 moves upward, the pressure inside the diaphragm cavity 341 causes the first diaphragm 352 and the second diaphragm 353 to move upward. The first diaphragm 352 closes the connection between the suction buffer cavity 16 and the diaphragm cavity 341, while the second diaphragm 353 opens the connection between the diaphragm cavity 341 and the connecting channel 111. At this time, the fluid medium in the diaphragm cavity 341 flows into the connecting channel 111.

[0047] refer to Figure 2 and Figure 4 An intake buffer diaphragm 6 is installed inside the intake buffer chamber 16, and an exhaust buffer diaphragm 7 is installed inside the exhaust buffer chamber 17. Both the intake buffer diaphragm 6 and the exhaust buffer diaphragm 7 are elastic. The upper cover 12 and the upper valve plate 11 clamp the edge of the intake buffer diaphragm 6, and the fluid medium in the intake buffer chamber 16 comes into contact with the intake buffer diaphragm 6, which can provide buffering for the fluid medium entering the intake buffer chamber 16. Multiple support ribs 18 are fixedly connected to the outside of the intake buffer chamber 16, which can improve the structural strength of the intake buffer chamber 16.

[0048] refer to Figure 2 and Figure 4 A support column 15 is fixedly connected inside the suction buffer chamber 16. The support column 15 abuts against the bottom side of the suction buffer diaphragm 6, so that the support column 15 can provide support for the suction buffer diaphragm 6, limit the movement range of the suction buffer diaphragm 6, effectively improve the situation where the suction buffer diaphragm 6 is damaged due to excessive force during operation, and improve the working life of the suction buffer diaphragm 6.

[0049] refer to Figure 2 A lower housing 14 is detachably connected to the bottom side of the upper valve plate 11 via bolts. A discharge buffer diaphragm 7 is located between the lower housing 14 and the upper valve plate 11, with the lower housing 14 and the upper valve plate 11 clamping the discharge buffer diaphragm 7. The fluid medium in the discharge buffer chamber 17 contacts the discharge buffer diaphragm 7, which provides buffering for the fluid medium within the discharge buffer chamber 17. A damping chamber 141 is provided inside the lower housing 14, and an elastic element 19 is installed inside the damping chamber 141. In this embodiment, the elastic element 19 is specifically PU cotton; in other embodiments of this embodiment, the elastic element 19 can also be a spring. The elastic element 19 abuts against the discharge buffer diaphragm 7, providing buffering for the discharge buffer diaphragm 7.

[0050] refer to Figure 2 A small vent 142 is provided on the bottom side of the damping chamber 141, connecting the damping chamber 141 to the outside. Without the vent 142, movement of the discharge buffer diaphragm 7 would cause a small amount of gas inside the damping chamber 141 to escape through the installation gap, potentially causing the discharge buffer diaphragm 7 to be sucked in and sink. The vent 142, by connecting the damping chamber 141 to the outside, ensures that the discharge buffer diaphragm 7 will not be sucked in and sink.

[0051] The implementation principle of a low-pulsation diaphragm pump according to an embodiment of this application is as follows: the drive mechanism 3 works, so that the fluid medium enters the discharge buffer chamber 17 from the suction buffer chamber 16. The suction buffer diaphragm 6 provides buffering for the fluid medium in the suction buffer chamber 16, and the discharge buffer diaphragm 7 provides buffering for the fluid medium in the discharge buffer chamber 17, thereby reducing pulsation and noise. The low-pulsation diaphragm pump of this application has a high degree of integration and can reduce space occupation.

[0052] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A low-pulsation diaphragm pump, characterized in that, include: Pump chamber housing (1), wherein a suction buffer chamber (16) and a discharge buffer chamber (17) are provided inside the pump chamber housing (1), and the suction buffer chamber (16) and the discharge buffer chamber (17) are connected; Pump body (2), the pump chamber housing (1) and the pump body (2) are connected; Drive mechanism (3), the drive mechanism (3) is connected to the pump body (2), the drive mechanism (3) is used to drive the fluid medium from the suction buffer chamber (16) into the discharge buffer chamber (17); An inhalation buffer diaphragm (6) is connected to the inhalation buffer chamber (16) and provides buffering for the fluid medium entering the inhalation buffer chamber (16). Discharge buffer diaphragm (7) is connected to the discharge buffer chamber (17) and provides buffering for the fluid medium entering the discharge buffer chamber (17).

2. The low-pulsation diaphragm pump according to claim 1, characterized in that, The pump housing (1) includes a valve upper plate (11) and an upper cover (12), which are detachably connected. The valve upper plate (11) and the upper cover (12) clamp the edge of the suction buffer diaphragm (6).

3. A low-pulsation diaphragm pump according to claim 2, characterized in that, The pump chamber housing (1) also includes a support column (15), which is connected to the valve upper plate (11). The support column (15) is located in the suction buffer chamber (16). The support column (15) and the upper cover (12) are located on both sides of the suction buffer diaphragm (6). The support column (15) is used to support the suction buffer diaphragm (6).

4. A low-pulsation diaphragm pump according to claim 2, characterized in that, The pump chamber housing (1) also includes a lower housing (14), which is detachably connected to the upper valve plate (11). The lower housing (14) and the upper valve plate (11) clamp the edge of the discharge buffer diaphragm (7).

5. A low-pulsation diaphragm pump according to claim 4, characterized in that, The valve upper plate (11) is connected to a support rib (18), and multiple support ribs (18) are provided. The multiple support ribs (18) are connected to the outer wall of the suction buffer chamber (16).

6. A low-pulsation diaphragm pump according to claim 4, characterized in that, The lower shell (14) is provided with a damping chamber (141), which contains an elastic element (19) that abuts against the discharge buffer diaphragm (7).

7. A low-pulsation diaphragm pump according to claim 6, characterized in that, The lower shell (14) has a small vent (142) that connects the damping chamber (141) to the outside.

8. A low-pulsation diaphragm pump according to claim 2, characterized in that, The pump chamber housing (1) also includes a lower valve plate (13), which is detachably connected to the upper valve plate (11). The drive mechanism (3) includes a valve plate (35), which is held by the upper valve plate (11) and the lower valve plate (13). The valve plate (35) allows the fluid medium in the suction buffer chamber (16) to flow into the discharge buffer chamber (17).

9. A low-pulsation diaphragm pump according to claim 2, characterized in that, The drive mechanism (3) also includes a motor (31), an eccentric wheel (32), a connecting rod (33), and a diaphragm (34). The motor (31) is connected to the pump body (2). The eccentric wheel (32) is connected to the output shaft of the motor (31). The connecting rod (33) is sleeved on the outside of the eccentric wheel (32). The diaphragm (34) is connected to the connecting rod (33). The diaphragm (34) is installed between the pump chamber housing (1) and the pump body (2). The motor (31) drives the diaphragm (34) to reciprocate through the eccentric wheel (32) and the connecting rod (33), so that the fluid medium enters the discharge buffer chamber (17) from the suction buffer chamber (16).

10. A low-pulsation diaphragm pump according to claim 9, characterized in that, The pump body (2) includes a support shell (21) and an end plate (22), which are detachably connected; the drive mechanism (3) further includes a first bearing (36) and a second bearing (37), the first bearing (36) being disposed between the connecting rod (33) and the eccentric wheel (32), and the second bearing (37) being disposed between the end plate (22) and the output shaft of the motor (31).

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