A diaphragm pump

Abstract

This application relates to the field of diaphragm pump technology, and in particular to a diaphragm pump, comprising a pump body and a valve body disposed on the pump body. A rotating shaft is rotatably connected to the inner wall of the pump body. A mounting hole is formed on the side wall of the pump body, and the mounting hole communicates with the inner cavity of the valve body. A transmission rod is disposed on the outer wall of the rotating shaft, and a diaphragm is fixed on the outer wall of the transmission rod. The diaphragm is slidably disposed from the mounting hole. A connecting member for driving the end of the transmission rod to slide is disposed on the outer wall of the rotating shaft. A drive assembly for driving the rotating shaft to rotate is disposed on the inner wall of the pump body. This application has the effect of reducing the support for the rotating shaft that drives the diaphragm pump, thereby reducing the number of times the coaxiality of the rotating shaft that drives the diaphragm pump and the bearing on its outer wall needs to be adjusted.

Description

Technical Field

[0001] This application relates to the field of diaphragm pump technology, and in particular to a diaphragm pump. Background Technology

[0002] Diaphragm pumps are commonly used fluid transfer devices, widely applied in industries such as chemical, pharmaceutical, food, electronics, and textiles. The insight that pump performance depends on its drive has propelled diaphragm pump technology forward significantly, fundamentally improving its performance.

[0003] The drive unit of a traditional diaphragm pump is a separate component (motor). The shaft of the separate component drives the eccentric wheel of the diaphragm pump to rotate, thus making the diaphragm pump run. When the operator installs the separate component on the diaphragm pump, one end of the shaft of the separate component needs to be inserted into the diaphragm pump and supported by a bearing. The middle position of the separate component also needs to be supported by a bearing to make the connection between the separate component and the diaphragm pump more stable.

[0004] The inventors believe that the above-mentioned method of installing independent components on the outer wall of the diaphragm pump requires at least three bearings to be installed on the outer wall of the rotating shaft of the independent component. In order to reduce the wear on the bearings, it is necessary to ensure the concentricity between the rotating shaft of the independent component and the bearings. The above-mentioned method of driving the diaphragm pump by independent components has the problem of many adjustments and needs to be improved. Summary of the Invention

[0005] In order to make the diaphragm pump more compact and reduce the support of the shaft that drives the diaphragm pump to rotate, thereby reducing the number of times the coaxiality between the shaft and bearing of the independent components is adjusted during the assembly of the independent components and the diaphragm pump, this application provides a diaphragm pump.

[0006] This application provides a diaphragm pump, which adopts the following technical solution:

[0007] A diaphragm pump includes a pump body and a valve body disposed on the pump body. A rotating shaft is rotatably connected to the inner wall of the pump body. A mounting hole is provided on the side wall of the pump body, and the mounting hole communicates with the inner cavity of the valve body. A transmission rod is disposed on the outer wall of the rotating shaft, and a diaphragm is fixed on the outer wall of the transmission rod. The diaphragm is slidably disposed from the mounting hole. A connecting member for driving the end of the transmission rod to slide is disposed on the outer wall of the rotating shaft. A drive assembly for driving the rotating shaft to rotate is disposed on the inner wall of the pump body.

[0008] By adopting the above technical solution, the operator connects the valve body to the channel of the medium to be transferred. The drive component drives the rotating shaft to rotate, and the end of the transmission rod moves under the action of the connecting parts, causing the diaphragm to move. The diaphragm slides on the inner wall of the valve body, and the transfer of the medium is achieved by the pumping of the diaphragm. By assembling the independent components with the diaphragm pump, only the two ends of the rotating shaft that drives the diaphragm pump need to be supported, reducing the frequency of coaxiality maintenance of the diaphragm pump shaft.

[0009] Optionally, a first bearing is installed at both ends of the rotating shaft, and the thickness of the first bearing is 1-2 times the radius of the rotating shaft.

[0010] By adopting the above technical solution, replacing two coaxially fixed shafts with misalignment with a single shaft, and directly integrating independent components into the pump body, space is left, making it easier for workers to install the thickest possible first bearings at both ends of the rotating shaft. This increases the load-bearing capacity of the first bearings and extends their lifespan, thereby extending the lifespan of the diaphragm pump.

[0011] Optionally, the connecting member includes an eccentric wheel coaxially fixed on the outer wall of the rotating shaft and a second bearing fixed on the outer wall of the eccentric wheel. A through hole is provided through the side wall of the transmission rod, and the outer ring of the second bearing is fixedly connected to the inner wall of the through hole.

[0012] By adopting the above technical solution, the rotating shaft drives the eccentric wheel to rotate during rotation, the eccentric wheel drives the second bearing to move, the second bearing drives the conveyor rod to move, and the end of the conveyor rod drives the diaphragm to move; the setting of the second bearing makes the movement of the conveyor rod smoother.

[0013] Optionally, the drive assembly includes a housing coaxially fixed to the rotating shaft, a magnetic ring snapped and fixed inside the housing, a drive plate fixed to the pump body for fixing electrical components, and a coil core fixed to the side wall of the drive plate. The coil core is located inside the cavity of the magnetic ring and is electrically connected to the drive plate. The rotation of the housing drives the rotating shaft to rotate.

[0014] By adopting the above technical solution, the electrical components of the diaphragm pump are installed on the drive plate. The drive plate controls the energization of the coil core, causing the magnetic ring to rotate, the casing to rotate, and thus driving the rotating shaft to rotate.

[0015] Optionally, a connecting rod is fixed to the end of the conveying rod, and a number of blocking plates are fixed on the outer wall of the end of the connecting rod away from the conveying rod. The number of blocking plates are of different sizes, and a number of limiting grooves are opened at corresponding positions on the diaphragm. The blocking plates are engaged and fixed with the inner wall of the limiting grooves.

[0016] By adopting the above technical solution, the positions of the diaphragm and the blocking plates on the conveyor rod are injection molded, so that a limiting groove is formed on the diaphragm to cooperate with the blocking plates. Under the restriction of the limiting plates, the diaphragm and the conveyor rod are fixed together. The blocking plates are of different sizes, so that the connecting rod applies force to the diaphragm at different positions, reducing the stress concentration on the diaphragm. The insertion and fixing method makes it easier to fix the conveyor rod and the diaphragm, and makes it easier for the staff to replace the diaphragm.

[0017] Optionally, the pump body has several heat dissipation grooves on its outer wall, a heat dissipation cylinder is fixed on the outer wall of the pump body, several vent pipes are fixed on the side wall of the heat dissipation cylinder, all of the vent pipes are connected to the heat dissipation cylinder and are connected to external gas, and a sealing plate is hinged between the vent pipe and the heat dissipation cylinder, and a piston is slidably connected to the inner wall of the heat dissipation cylinder, the piston sliding controls the opening and closing of several sealing plates, so that gas flows between the heat dissipation cylinder and the vent pipes, and the pump body is provided with a linkage component for driving the piston to slide.

[0018] By adopting the above technical solution, the external gas flows on the inner wall of the heat dissipation tank. The opening of the heat dissipation tank increases the contact area between the pump body and the external gas, which is conducive to the heat dissipation of the pump body. During the operation of the diaphragm pump, the linkage component is activated. The linkage component drives the piston to slide in the vent pipe, which causes it to open intermittently. Under the pumping of the piston, the flow rate of the external gas through the heat dissipation cylinder and the vent pipe is increased, thereby accelerating the cooling rate of the diaphragm pump.

[0019] Optionally, the linkage component includes a drive frame hinged to the transmission rod and a drive rod fixed to the piston, wherein the drive frame is hinged to the drive rod.

[0020] By adopting the above technical solution, the conveyor rod drives the diaphragm to slide synchronously, and the drive frame moves in turn. The drive frame drives the drive rod to move, and the piston slides in the heat sink under the drive of the drive rod.

[0021] Optionally, the valve body includes an upper valve plate and a lower valve plate fixed on the upper valve plate. Both the upper valve plate and the lower valve plate are hollow. The upper valve plate and the lower valve plate are connected in communication. A cover plate is provided on the upper valve plate. The upper valve plate is a flow channel for the medium. The lower valve plate is fixed at the position of the mounting hole on the pump body. The diaphragm slides in the inner cavity of the lower valve plate.

[0022] By adopting the above technical solution, the diaphragm slides in the inner cavity of the lower valve plate during the movement of the conveyor rod. The medium enters from the inlet on the side wall of the upper valve plate and flows out from the outlet on the side wall of the upper valve plate. The operator can remove the lower valve plate from the pump body to expose the diaphragm to the outside world and replace the diaphragm.

[0023] Optionally, a fixing seat is fixed on the side wall of the pump body, one of the first bearings is mounted on the fixing seat, a plurality of snap-fit ​​holes are provided on the side wall of the pump body, and a spline is snap-fitted and fixed on the inner wall of each snap-fit ​​hole, and a plurality of fixing pins are threaded through the fixing seat, and the fixing pins are threadedly connected to the spline.

[0024] By adopting the above technical solution, the fixed seat is set to block the opening of the pump body and is used to install the second bearing. The operator tightens the fixing pin to fix the fixing pin to the spline. Under the limit of the fixing pin, the fixed seat is fixed on the pump body. The spline setting has the function of circumferential limit, so that the fixing pin can achieve a greater tightening torque.

[0025] Optionally, a cooling fan is fixed on the outer wall of the rotating shaft, and the cooling fan rotates to a position close to the drive plate.

[0026] By adopting the above technical solution, the diaphragm pump generates a large amount of heat during operation. The rotation of the rotating shaft drives the cooling fan to rotate. The cooling fan increases the gas flow rate inside the diaphragm pump, thereby improving the cooling effect of the diaphragm pump.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. The drive assembly rotates the rotating shaft, which in turn moves the conveyor rod under the influence of the connecting parts. The conveyor rod then moves the diaphragm to slide, transferring the external medium. By assembling external, independent components with the diaphragm pump and driving its operation through a single rotating shaft, the stability of the diaphragm pump during operation is improved, and wear on the pump components caused by the vibration of the rotating shaft is reduced.

[0029] 2. During the production of the diaphragm pump, the drive assembly that drives the diaphragm to slide is assembled together, which reduces the space occupied by the diaphragm pump. The workers prefer to install a thicker first bearing to better support the rotating shaft, thereby improving the service life of the diaphragm pump.

[0030] 3. The opening of the heat dissipation slots increases the contact area between the external flowing gas and the outer wall of the pump body, which is conducive to heat dissipation of the pump body and improves the thermal management of the diaphragm pump. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the overall structure of the diaphragm pump in the embodiments of this application.

[0032] Figure 2 This is a structural schematic diagram of the pump body portion in an embodiment of this application, used to show the heat dissipation cylinder on the outer wall of the pump body.

[0033] Figure 3 This is an exploded view of the diaphragm pump in an embodiment of this application.

[0034] Figure 4 This is a cross-sectional view of the diaphragm portion in an embodiment of this application.

[0035] Figure 5 This is a cross-sectional view of the heat sink portion in an embodiment of this application, used to show the structure inside the heat sink cavity.

[0036] Reference numerals: 1. Pump body; 2. Valve body; 3. Rotating shaft; 4. Mounting hole; 5. Transmission rod; 6. Diaphragm; 7. Connecting piece; 8. Drive assembly; 9. First bearing; 10. Eccentric wheel; 11. Second bearing; 12. Fixing hole; 13. Coil core; 14. Magnetic ring; 15. Drive plate; 16. Connecting rod; 17. Blocking plate; 18. Limiting groove; 19. Heat dissipation groove; 20. Heat dissipation cylinder; 21. Vent pipe; 22. Sealing plate; 23. Piston; 24. Linkage component; 25. Drive frame; 26. Drive rod; 27. Upper valve plate; 28. Lower valve plate; 29. ​​Cover plate; 30. Fixing seat; 31. Snap-fit ​​hole; 32. Spline; 33. Fixing pin; 34. Valve plate; 35. Rubber ring; 36. Sealing plate; 37. Cover; 38. Cooling fan. Detailed Implementation

[0037] The following is in conjunction with the appendix Figure 1-5 This application will be described in further detail.

[0038] This application discloses a diaphragm pump.

[0039] Reference Figure 1 and Figure 2 A diaphragm pump includes a pump body 1, which is rectangular in shape. The side wall of the pump body 1 has a mounting hole 4 that communicates with the inner cavity of the pump body 1. The diaphragm pump also includes a valve body 2 that is fixed to the side wall of the pump body 1 by bolts. The valve body 2 is perpendicular to the pump body 1. The pump body 1 is used to provide power, and the valve body 2 is used to transfer the medium.

[0040] Reference Figure 2 and Figure 3 The valve body 2 includes a lower valve plate 28 and an upper valve plate 27. The lower valve plate 28 covers the mounting hole 4 on the pump body 1. The upper valve plate 27 is located on the side of the lower valve plate 28 away from the pump body 1. A valve plate 34 is snapped and fixed between the upper valve plate 27 and the lower valve plate 28. A snap-fit ​​groove is opened on the side of the upper valve plate 27 away from the lower valve plate 28. A rubber ring 35 is snapped and fixed on the inner wall of the snap-fit ​​groove. A sealing plate 36 is covered on the side of the upper valve plate 27 away from the lower valve plate 28. A cover plate 29 is covered on the side of the upper valve plate 27 away from the lower valve plate 28. Holes are opened through the side walls of the upper valve plate 27, the lower valve plate 28, and the cover plate 29. Bolts are passed through the upper valve plate 27, the lower valve plate 28, and the cover plate 29 and fixed to the pump body 1 by bolts.

[0041] Reference Figure 3 The pump body 1 has several snap-fit ​​holes 31 on its side wall. In this application, there are four snap-fit ​​holes 31. A spline 32 is snapped and fixed on the inner wall of each snap-fit ​​hole 31. A fixing seat 30 is provided on the opening of the pump body 1. The side wall of the fixing seat 30 has holes. Several fixing pins 33 pass through the fixing seat 30. The fixing pins 33 are arranged in a one-to-one correspondence with the splines 32. The fixing pins 33 are threadedly connected to the corresponding splines 32. Tightening the fixing pins 33 fixes the fixing seat 30 to the pump body 1. The splines 32 reduce the possibility of damage to the pump body 1 when the operator tightens the fixing pins 33, and also reduce the possibility of relative rotation between the splines 32 and the pump body 1, thereby improving the stability of the connection between the fixing seat 30 and the pump body 1.

[0042] Reference Figure 3 A fixing hole 12 is provided on the side of the pump body 1 away from the fixing seat 30. A fixing hole 12 is also provided through the side wall of the fixing seat 30. A first bearing 9 is coaxially fixed in both fixing holes 12. A rotating shaft 3 is coaxially fixed on the inner wall of the two first bearings 9. A transmission rod 5 is sleeved on the outer wall of the rotating shaft 3. A through hole is provided through the side wall of the transmission rod 5. The outer ring of the first bearing 9 is fixed to the inner wall of the through hole by a snap ring. The rotating shaft 3 rotates inside the pump body 1. A drive assembly 8 for driving the rotating shaft 3 to rotate is provided on the inner wall of the pump body 1.

[0043] Reference Figure 3 The drive assembly 8 includes a drive plate 15 fixed to the side wall of the fixed base 30 by screws, a coil core 13 welded to the side wall of the drive plate 15, a cover 37 coaxially fixed to the outer wall of the rotating shaft 3, and a magnetic ring 14 snapped onto the inner wall of the cover 37. The magnetic ring 14 is coaxially arranged with the rotating shaft 3. The drive plate 15 is used to install electrical components in the diaphragm pump. The coil core 13 is electrically connected to the electrical components on the drive plate 15. The electrical components on the drive plate 15 are electrically connected to an external power source through wires. The electrical components on the drive plate 15 energize the coil core 13, causing the magnetic ring 14 to rotate, which in turn drives the cover 37 to rotate, and the cover 37 drives the rotating shaft 3 to rotate.

[0044] Reference Figure 3 A cooling fan 38 is coaxially fixed on the outer wall of the rotating shaft 3. During the operation of the diaphragm pump, the rotating shaft 3 rotates, which drives the cooling fan 38 to rotate. The cooling fan 38 increases the flow rate of gas in the diaphragm pump cavity, thereby increasing the cooling rate of the diaphragm pump.

[0045] Reference Figure 3 and Figure 4A connector 7 for fixing the conveyor rod 5 to the outer wall of the rotating shaft 3 is provided on the outer wall of the rotating shaft 3. A connecting rod 16 is welded and fixed to the end of the conveyor rod 5 away from the rotating shaft 3. Several blocking plates 17 are welded and fixed to the outer wall of the connecting rod 16. In this application, three blocking plates 17 are preferably provided. The three blocking plates 17 are of different sizes. A diaphragm 6 is snapped and fixed to the outer wall of the connecting rod 16. The diaphragm 6 is hollow. The diaphragm 6 and the conveyor rod 5 are fixedly connected by injection molding, so that three limiting grooves 18 are integrally formed on the inner wall of the diaphragm 6. The blocking plates 17 are snapped into the limiting grooves 18 respectively. Under the limiting of the blocking plates 17, the diaphragm 6 is fixed to the connecting rod 16.

[0046] Reference Figure 3 and Figure 4 In this application, the diaphragm 6 is preferably made of rubber. The diaphragm 6 slides on the inner wall of the lower valve plate 28. The inlet and outlet of the diaphragm pump are both located on the upper valve plate 27. The diaphragm 6 slides inside the lower valve plate 28. The external medium enters from the inlet of the upper valve plate 27 and flows out from the outlet of the upper valve plate 27.

[0047] Reference Figure 3 The connecting component 7 includes an eccentric wheel 10 coaxially fixed to the outer wall of the rotating shaft 3 and a second bearing 11 riveted to the outer wall of the eccentric wheel 10. The eccentric wheel 10 is fixed to the outer wall of the rotating shaft 3 by screws. A through hole is provided in the side wall of the transmission rod 5. The outer ring of the second bearing 11 is integrally fixed to the inner wall of the transmission rod 5 by injection molding. During the rotation of the rotating shaft 3, the eccentric wheel 10 is driven to rotate, and under the drive of the second bearing 11, the diaphragm 6 slides in the inner cavity of the valve upper plate 27.

[0048] Reference Figure 2 The outer wall of the pump body 1 has several heat dissipation grooves 19. During operation, the diaphragm pump tends to sway, and external gas flows within the heat dissipation grooves 19, facilitating heat dissipation. A heat dissipation cylinder 20 is fixed to the outer wall of the pump body 1 by screws. Several air inlets and outlets are provided on the side wall of the heat dissipation cylinder 20. In this application, there are two air inlets and two air outlets. Several vent pipes 21 are welded and fixed to the side wall of the heat dissipation cylinder 20, with vent pipes 21 positioned at both the air inlets and outlets. (Refer to...) Figure 5The connection between the vent pipe 21 and the heat sink 20 is secured with a retaining ring. The retaining ring communicates with both the heat sink 20 and the vent pipe 21. Each retaining ring has a sealing plate 22 hinged to its side wall. Two sealing plates 22 are located on the side of the retaining ring facing the inner cavity of the heat sink 20, while the other two are located on the side of the retaining ring facing away from the inner cavity of the heat sink 20. A piston 23 is slidably connected within the inner cavity of the heat sink 20. As the piston 23 slides within the heat sink 20, the corresponding sealing plates 22 open, allowing gas to flow through the vent pipe 21 and the heat sink 20, accelerating the gas flow rate and thus increasing the cooling rate of the diaphragm pump.

[0049] Reference Figure 2 The pump body 1 has a linkage component 24 on its inner wall for driving the piston 23 to slide. The linkage component 24 includes a drive frame 25 hinged to the outer wall of the transmission rod 5 and a drive rod 26 hinged to the end of the drive frame 25 away from the transmission rod 5. The end of the drive rod 26 away from the drive frame 25 is fixedly connected to the outer wall of the piston 23 by screws. When the transmission rod 5 moves, it drives the drive frame 25 to move. The drive frame 25 drives the drive rod 26 to slide, thereby causing the drive rod 26 to drive the piston 23 to slide inside the heat sink 20.

[0050] The implementation principle of a diaphragm pump according to an embodiment of this application is as follows: The diaphragm pump is installed on the pipeline of the medium to be pumped, and the electrical components on the drive plate 15 are energized. The electrical components on the drive unit energize the coil core 13, the magnetic ring 14 rotates, and the cover 37 rotates synchronously, thereby driving the rotating shaft 3 to rotate. Under the action of the eccentric wheel 10 and the second bearing 11, the transmission rod 5 moves. The transmission rod 5 drives the diaphragm 6 to slide in the inner cavity of the lower valve plate 28, thereby realizing the transfer of external medium. The setting of the rotating shaft 3 improves the coaxiality of the rotating shaft on the diaphragm pump, reduces the wear on the parts of the diaphragm pump during the operation of the diaphragm pump, thereby improving the service life of the diaphragm pump.

[0051] 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 diaphragm pump, comprising a pump body (1) and a valve body (2) disposed on the pump body (1), characterized in that: A rotating shaft (3) is rotatably connected to the inner wall of the pump body (1). An installation hole (4) is provided on the side wall of the pump body (1). The installation hole (4) is connected to the inner cavity of the valve body (2). A transmission rod (5) is provided on the outer wall of the rotating shaft (3). A diaphragm (6) is fixed on the outer wall of the transmission rod (5). The diaphragm (6) is slidably disposed with the installation hole (4). A connecting piece (7) for driving the end of the transmission rod (5) to slide is provided on the outer wall of the rotating shaft (3). A drive assembly (8) for driving the rotating shaft (3) to rotate is provided on the inner wall of the pump body (1). The connector (7) includes an eccentric wheel (10) coaxially fixed on the outer wall of the rotating shaft (3) and a second bearing (11) fixed on the outer wall of the eccentric wheel (10). A through hole is provided on the side wall of the transmission rod (5), and the outer ring of the second bearing (11) is fixedly connected to the inner wall of the through hole. The drive assembly (8) includes a housing (37) coaxially fixed with the rotating shaft (3), a magnetic ring (14) snapped and fixed inside the housing (37), a drive plate (15) fixed to the pump body (1) for fixing electrical components, and a coil core (13) fixed on the side wall of the drive plate (15). The coil core (13) is located inside the cavity of the magnetic ring (14). The coil core (13) is electrically connected to the drive plate (15). The rotation of the housing (37) drives the rotating shaft (3) to rotate. The pump body (1) has several heat dissipation grooves (19) on its outer wall. A heat dissipation cylinder (20) is fixed on the outer wall of the pump body (1). Several vent pipes (21) are fixed on the side wall of the heat dissipation cylinder (20). The vent pipes (21) are all connected to the outside gas. The vent pipes (21) are all connected to the heat dissipation cylinder (20). A sealing plate (22) is hinged between the vent pipe (21) and the heat dissipation cylinder (20). A piston (23) is slidably connected to the inner wall of the heat dissipation cylinder (20). The piston (23) slides to control the opening and closing of several sealing plates (22), so that gas flows between the heat dissipation cylinder (20) and the vent pipes (21). The pump body (1) is provided with a linkage component (24) for driving the piston (23) to slide. The linkage component (24) includes a drive frame (25) hinged to the transmission rod (5) and a drive rod (26) fixed to the piston (23), wherein the drive frame (25) is hinged to the drive rod (26).

2. A diaphragm pump according to claim 1, characterized in that: Both ends of the rotating shaft (3) are equipped with first bearings (9), and the thickness of the first bearings (9) is 1-2 times the radius of the rotating shaft (3).

3. A diaphragm pump according to claim 1, characterized in that: A connecting rod (16) is fixed to the end of the conveying rod (5). Several blocking plates (17) are fixed on the outer wall of the end of the connecting rod (16) away from the conveying rod (5). The size of the blocking plates (17) is different. Several limiting grooves (18) are opened at corresponding positions on the diaphragm (6). The blocking plates (17) are engaged and fixed with the inner wall of the limiting grooves (18).

4. A diaphragm pump according to claim 1, characterized in that: The valve body (2) includes an upper valve plate (27) and a lower valve plate (28) fixed on the upper valve plate (27). Both the upper valve plate (27) and the lower valve plate (28) are hollow. The upper valve plate (27) and the lower valve plate (28) are connected in communication. The upper valve plate (27) is covered with a cover plate (29). The upper valve plate (27) is a flow channel for the medium. The lower valve plate (28) is fixed at the position of the mounting hole (4) on the pump body (1). The diaphragm (6) slides in the inner cavity of the lower valve plate (28).

5. A diaphragm pump according to claim 2, characterized in that: A fixing seat (30) is fixed on the side wall of the pump body (1), and one of the first bearings (9) is installed on the fixing seat (30). A plurality of snap-fit ​​holes (31) are provided on the side wall of the pump body (1), and splines (32) are snap-fitted and fixed on the inner wall of each snap-fit ​​hole (31). A plurality of fixing pins (33) are threaded through the fixing seat (30), and the fixing pins (33) are threadedly connected to the splines (32).

6. A diaphragm pump according to claim 1, characterized in that: A cooling fan (38) is fixed on the outer wall of the rotating shaft (3), and the cooling fan (38) rotates to a position close to the drive plate (15).

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