Diaphragm pump

Abstract

The utility model particularly relates to a diaphragm pump which comprises a base provided with an inlet valve and an outlet valve. The diaphragm is provided with a plurality of cavities, and each cavity is provided with a piston; and the driving mechanism is provided with a driving structure matched with the multiple pistons, the driving mechanism drives the multiple pistons through the driving structure so as to adjust the multiple pressures of the multiple cavities, and the diaphragm pump opens the inlet valve or the outlet valve according to changes of the multiple pressures. According to the diaphragm pump, by optimizing the structural design of the diaphragm, the problem that the service life of the diaphragm and the diaphragm pump is short can be solved under the condition that the material cost, the whole machine size and the diaphragm area are not increased, and therefore the diaphragm pump can meet the large-flow requirement and the normal use performance of the diaphragm.

Description

Technical Field

[0001] This application relates to the field of household appliance technology, specifically to diaphragm pumps. Background Technology

[0002] To increase the working flow rate of diaphragm pumps in the present technology, methods such as increasing the cavity volume of the diaphragm, increasing the piston area, and increasing the motor power are often adopted. However, increasing the cavity volume of the diaphragm, the piston area, and the motor power indefinitely can lead to quality problems in the diaphragm pump, especially increasing the probability of diaphragm failure. Utility Model Content

[0003] In view of this, this application provides a diaphragm pump to solve the technical problem that diaphragm pumps in the prior art cannot simultaneously meet the requirements of large flow rates and the normal performance of the diaphragm.

[0004] This application provides a diaphragm pump, which includes: a base, the base being provided with an inlet valve and an outlet valve; a diaphragm, the diaphragm being provided with multiple chambers, each chamber being provided with a piston; and a drive mechanism, the drive mechanism being provided with a drive structure that cooperates with the multiple pistons, the drive mechanism driving the multiple pistons through the drive structure to adjust multiple pressures in the multiple chambers, and the diaphragm pump opening the inlet valve or the outlet valve according to the changes in the multiple pressures.

[0005] Beneficial effects: The diaphragm pump proposed in this application solves the problem of short lifespan of the diaphragm and the diaphragm pump without increasing material costs, overall machine size and diaphragm area by optimizing the structural design of the diaphragm. This allows the diaphragm pump to meet both high flow rate requirements and normal diaphragm performance.

[0006] Specifically, the piston drives the diaphragm to move up and down, causing a volume change in the diaphragm chamber. This volume change creates positive or negative pressure on the gas or liquid within the chamber. When negative pressure is generated, the inlet valve on the diaphragm pump opens, and the gas or liquid flows into the diaphragm chamber under the influence of atmospheric pressure. While the chamber is under negative pressure, the outlet valve on the diaphragm pump is closed. When positive pressure is generated in the diaphragm chamber, i.e., when the internal pressure exceeds the external pressure at the inlet valve, the inlet valve closes, and the outlet valve opens under pressure, allowing the gas or liquid within the diaphragm chamber to exit through the outlet valve.

[0007] In one alternative implementation, the inner diameter of the chamber is set to D, and the diameter of the piston is set to d, where 0.2 ≤ d / D ≤ 0.4.

[0008] Beneficial effects: The d / D design has a reasonable range of values, that is, the flow rate has a certain peak value within a certain range. When β is 0.3, the pumping efficiency is the highest, ensuring the reasonable pumping efficiency of the diaphragm pump. Studies have shown that when d / D is 0.2-0.4, the pumping efficiency of the diaphragm pump is more reasonable. A reasonable d / D value produces the following beneficial effects: meeting the service life requirements of the diaphragm, reducing the flow fluctuation of the diaphragm pump, and solving the problem of difficult start-up of the diaphragm pump under low voltage.

[0009] In one alternative embodiment, the diaphragm is provided with multiple grooves recessed in the direction of multiple drive structures, and multiple chambers are formed inside the multiple grooves. The piston is disposed at the bottom of the grooves and can adjust the pressure of the chambers by pushing and pulling the grooves.

[0010] Beneficial effects: Multiple grooves form multiple chambers inside, which has the advantages of simple structure, easy manufacturing and volume adjustment. Moreover, the compression and stretching operation of the grooves is relatively simple, which solves the problem of easy failure of complex drives.

[0011] In one alternative embodiment, the piston is configured to be integrally formed with the groove, and the bottom and sidewalls of the groove are configured as flexible connecting parts connected to the piston. The piston adjusts the pressure in the chamber by deforming the bottom and sidewalls of the groove by pushing and pulling.

[0012] Beneficial effects: During the operation of the diaphragm pump, as the drive mechanism moves, it drives the piston to move the diaphragm up and down, causing the bottom and sidewalls of the diaphragm chamber to move up and down synchronously, thereby changing the volume and pressure of the chamber. The piston and groove are integrally molded, offering advantages such as simple structure and ease of operation, and eliminating the need to consider sealing factors between the piston and groove.

[0013] In one optional embodiment, the diaphragm pump further includes a support plate with multiple through holes. The periphery of the diaphragm extends to the outer edge of the support plate, and multiple chambers of the diaphragm are disposed in the multiple through holes. Multiple pistons of the diaphragm extend out of the support plate through the multiple through holes.

[0014] Beneficial effects: The support plate is used to support and fix the diaphragm, reducing the displacement or leakage of the diaphragm under the drive of the piston. In addition, the support plate also protects and isolates the multiple chambers of the diaphragm, reducing the phenomenon of the chambers being misaligned or interfering with each other under the drive of the piston.

[0015] In one alternative embodiment, the drive structure is configured as a snap-fit ​​disc connected to the drive mechanism. The snap-fit ​​disc has multiple snap-fit ​​holes for snapping multiple pistons, and the drive mechanism drives at least a portion of the pistons to move through the snap-fit ​​disc.

[0016] Beneficial effects: The clamping plate clamps multiple pistons simultaneously. The clamping plate is connected to the narrow neck of the piston on the diaphragm, so that the piston can move up and down synchronously with the clamping plate. During the up and down movement of the piston, the volume of multiple chambers is adjusted synchronously, thereby achieving the purpose of synchronously adjusting the capacity and pressure of multiple chambers on the diaphragm, and achieving the purpose of fluid inlet and outlet of the diaphragm pump.

[0017] In one alternative embodiment, the drive mechanism is configured as a drive motor, and a transmission mechanism is provided between the drive motor and the card plate. The drive motor drives the card plate through the transmission mechanism to drive at least part of the piston to move.

[0018] Beneficial effects: The drive motor drives the card plate through the transmission mechanism to move at least part of the piston, thereby changing the total capacity and total pressure of the diaphragm. By changing the total capacity and total pressure of the diaphragm, the inlet valve and outlet valve can be switched on and off.

[0019] In one alternative embodiment, the transmission mechanism includes an eccentric wheel, one end of which is connected to the output shaft of the drive motor, and the other end of which is connected to the retaining plate. The drive motor drives the retaining plate to rotate through the eccentric wheel.

[0020] Beneficial effects: During the operation of the diaphragm pump, as the drive motor rotates, it drives the eccentric wheel to rotate as well. The eccentric wheel drives the clamping plate to rotate, and the clamping plate drives the piston to move up and down during rotation. This causes the bottom and side walls of the diaphragm chamber to move up and down synchronously, thereby changing the volume and pressure of the chamber.

[0021] In one alternative embodiment, the retaining plate is configured to be inclined relative to the diaphragm, and the retaining plate pushes a portion of the piston and stretches another portion of the piston during rotation.

[0022] Beneficial effects: During the operation of the diaphragm pump, as the drive motor rotates, it drives the eccentric wheel to rotate as well. The eccentric wheel drives the retaining plate to swing up and down, and the retaining plate drives the piston to move up and down, so that the bottom and side walls of the diaphragm chamber move up and down synchronously, thereby changing the volume and pressure of the chamber.

[0023] In one alternative embodiment, both the inlet valve and the outlet valve are configured as diaphragm valves, which open or close according to multiple pressures in the plurality of chambers.

[0024] Beneficial effects: When negative pressure is generated in the chamber, the inlet valve on the diaphragm pump opens, and gas or liquid flows into the diaphragm chamber under the action of external atmospheric pressure. When the chamber is under negative pressure, the outlet valve on the diaphragm pump is closed. When positive pressure is generated in the diaphragm chamber, that is, when the internal pressure of the chamber is greater than the external pressure at the inlet valve of the diaphragm pump, the inlet valve on the diaphragm pump closes, and the outlet valve on the diaphragm pump opens under pressure, so that the gas or liquid in the diaphragm chamber is discharged from the outlet valve of the diaphragm pump. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an exploded view of a diaphragm pump according to one embodiment of this application;

[0027] Figure 2 for Figure 1 The diagram shows the assembly guide for the diaphragm pump.

[0028] Figure 3 This is a cross-sectional view of a diaphragm pump according to an embodiment of this application;

[0029] Figure 4 This is a partial structural schematic diagram of a diaphragm pump according to an embodiment of this application;

[0030] Figure 5 This is a schematic diagram of the diaphragm structure according to one embodiment of this application;

[0031] Figure 6 for Figure 5 A bottom view of the diaphragm shown;

[0032] Figure 7 This is a diagram showing the piston travel path of the diaphragm according to one embodiment of this application;

[0033] Figure 8 This is a partial cross-sectional view of a diaphragm according to an embodiment of this application.

[0034] Explanation of reference numerals in the attached figures:

[0035] 100. Diaphragm pump;

[0036] 10. Base; 11. Inlet valve; 12. Outlet valve; 13. Inlet and outlet covers; 14. Sealing ring;

[0037] 20. Diaphragm; 21. Chamber; 211. Flexible connection; 22. Piston;

[0038] 30. Drive mechanism; 301. Fixed bracket; 31. Drive motor; 32. Drive structure; 321. Snap-fit ​​plate; 322. Snap-fit ​​hole; 323. Protrusion; 324. Transmission rod; 33. Transmission mechanism; 331. Eccentric wheel;

[0039] 40. Support plate; 41. Through hole. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0041] In the description of this application, it should be noted that the terms "inner," "upper," "outer," "lower," "underneath," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to fixed communication, detachable communication, or integral communication; they can refer to mechanical communication or electrical communication; they can refer to direct connection or indirect connection through an intermediate medium; they can refer to communication within two components; and they can refer to wireless communication or wired communication. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0043] Research has found that in order to meet the high flow rate requirements of diaphragm pumps, unrestricted increases in the diaphragm cavity volume, piston area, and motor power can lead to the following quality problems with the diaphragm:

[0044] Excessive deformation of the diaphragm results in large stress and strain, leading to a shorter lifespan for the core component diaphragm and making it prone to cracking and leakage.

[0045] The diaphragm deforms significantly, and the deformation force and deformation work increase simultaneously. At the same time, the diaphragm material is a rubber component, and due to manufacturing reasons, the hardness of rubber components fluctuates greatly. Since hardness is directly proportional to strength, the work required for diaphragm deformation also fluctuates significantly, resulting in large fluctuations in the flow rate of the diaphragm pump. For example, the flow rate of the diaphragm pump fluctuates significantly between a high temperature of 40℃ and a low temperature of 4℃. The flow performance of the diaphragm pump exceeds the set requirements, resulting in unqualified flow rate of the diaphragm pump, and may even have a significant impact on the overall flow performance of the diaphragm pump.

[0046] When the diaphragm deforms significantly, the low-pressure starting performance of the diaphragm pump deteriorates, or even fails to start, affecting the lifespan of the low-voltage DC motor of the diaphragm pump, and may even burn out the low-voltage DC motor of the diaphragm pump.

[0047] The flow rate of a diaphragm pump is generally controlled by adjusting the pump's voltage. However, when the diaphragm deforms significantly, the flow rate may not be directly proportional to the voltage, making it more difficult to control the flow rate of the diaphragm pump by adjusting its voltage.

[0048] Therefore, the structural characteristics of the diaphragm in a diaphragm pump are a key factor affecting its performance. By studying the structural characteristics of diaphragm pumps, we can identify the key influencing factors of the diaphragm and solve the problems mentioned above, such as short lifespan, large flow fluctuations, difficulty in flow control, and difficulty in starting under low voltage.

[0049] To address the issue that existing diaphragm pumps cannot simultaneously meet high flow rate requirements and ensure the normal performance of the diaphragm, this application proposes a diaphragm pump, which is described below in conjunction with... Figures 1 to 8 This describes an embodiment of the present application.

[0050] like Figures 1 to 8 As shown, according to an embodiment of this application, this application provides a diaphragm pump 100, which includes: a base 10, the base 10 being provided with an inlet valve 11 and an outlet valve 12; a diaphragm 20, the diaphragm 20 being provided with a plurality of chambers 21, each chamber 21 being provided with a piston 22; and a drive mechanism 30, the drive mechanism 30 being provided with a drive structure 32 cooperating with the plurality of pistons 22, the drive mechanism 30 driving the plurality of pistons 22 through the drive structure 32 to adjust the plurality of pressures in the plurality of chambers 21, and the diaphragm pump 100 opening the inlet valve 11 or the outlet valve 12 according to the changes in the plurality of pressures.

[0051] In this embodiment, the diaphragm pump 100 proposed in this application, by optimizing the structural design of the diaphragm 20, can solve the problem of short life of the diaphragm 20 and the diaphragm pump 100 without increasing material costs, overall machine volume and diaphragm 20 area, thereby enabling the diaphragm pump 100 to simultaneously meet the requirements of large flow rate and the normal performance of the diaphragm 20.

[0052] In addition, due to objective reasons related to the manufacturing control of the diaphragm 20, the hardness of the diaphragm 20 fluctuates greatly. This causes temperature fluctuations during the use of the diaphragm pump 100 to affect the hardness of the diaphragm 20. This embodiment of the application optimizes the structural design of the diaphragm 20 to reduce the fluctuation of the working flow rate of the diaphragm pump 100 caused by the hardness fluctuation of the diaphragm 20, thereby enabling the product performance of the diaphragm pump 100 to maintain a high degree of consistency.

[0053] Furthermore, by optimizing the structural design of the diaphragm 20, the risk of the diaphragm pump 100 failing to start due to low pressure is reduced, and the phenomenon of the drive mechanism 30 burning out due to stalling is also reduced.

[0054] It should be noted that the embodiments of this application do not limit the specific structure of the diaphragm 20 and the drive mechanism 30, because the improvement of this embodiment is that the drive mechanism 30 drives multiple pistons 22 through the drive structure 32 to adjust multiple pressures in multiple chambers 21, thereby causing the diaphragm pump 100 to open the inlet valve 11 or the outlet valve 12 according to the changes in multiple pressures. As for the specific structure of the diaphragm 20 and the drive mechanism 30, it can be set according to the type of diaphragm pump 100 and the actual use environment. For example, the diaphragm 20 can be set as an integral structure or a modular structure, and the drive mechanism 30 can be set as a linkage mechanism, a gear mechanism, or an eccentric mechanism. These adjustments are all within the protection scope of the embodiments of this application.

[0055] The following is through Figures 1 to 8 The embodiments described herein illustrate preferred embodiments of the specific structure of the diaphragm pump 100.

[0056] like Figure 8 As shown, in some embodiments, the inner diameter of the chamber 21 is set to D, and the diameter of the piston 22 is set to d, where 0.2≤d / D≤0.4.

[0057] In this embodiment, the d / D design has a reasonable range of values, that is, the flow rate has a certain peak value within a certain range. When β is 0.3, the pumping efficiency is the highest, ensuring a reasonable pumping efficiency for the diaphragm pump 100. Studies have shown that when d / D is 0.2-0.4, the pumping efficiency of the diaphragm pump 100 is relatively reasonable. A reasonable d / D value produces the following beneficial effects: meeting the service life requirements of the diaphragm 20, reducing the flow fluctuation of the diaphragm pump 100, and solving the problem of the diaphragm pump 100 being difficult to start under low voltage.

[0058] like Figures 4 to 8 As shown, in some embodiments, the diaphragm 20 is provided with a plurality of grooves recessed in the direction of a plurality of drive structures 32, and a plurality of chambers 21 are formed inside the plurality of grooves. The piston 22 is disposed at the bottom of the groove and can adjust the pressure of the chamber 21 by pushing and pulling the groove.

[0059] In the above embodiments, multiple chambers 21 are formed inside the multiple grooves, which has the advantages of simple structure, easy manufacturing and volume adjustment, and the compression and stretching operation of the grooves is relatively simple, solving the problem that complex drives are prone to failure.

[0060] Specifically, the diaphragm 20 and multiple grooves are integrated into a single structure, which not only has the advantages of simple structure and low manufacturing difficulty, but also good sealing performance. Among them, the grooves include rectangular structures and circular structures.

[0061] like Figures 4 to 8 As shown, in some embodiments, the piston 22 is integrally formed with the groove, and the bottom and sidewalls of the groove are configured as flexible connecting parts 211 connected to the piston 22. The piston 22 adjusts the pressure of the chamber 21 by pushing and pulling the bottom and sidewalls of the groove to deform.

[0062] In this embodiment, during the operation of the diaphragm pump 100, as the drive mechanism 30 moves, it drives the piston 22 to move the diaphragm 20 up and down, causing the bottom and sidewalls of the chamber 21 of the diaphragm 20 to move up and down synchronously, thereby changing the volume and pressure of the chamber 21. The piston 22 and the groove are integrally formed, which has the advantages of simple structure and easy operation, and eliminates the need to consider the sealing factor between the piston 22 and the groove.

[0063] like Figure 4 As shown, in some embodiments, the diaphragm pump 100 further includes a support plate 40, the support plate 40 is provided with a plurality of through holes 41, the periphery of the diaphragm 20 is attached to the outer edge of the support plate 40, a plurality of chambers 21 of the diaphragm 20 are provided in the plurality of through holes 41, and a plurality of pistons 22 of the diaphragm 20 extend out of the support plate 40 through the plurality of through holes 41.

[0064] In the above embodiment, the support plate 40 is used to support and fix the diaphragm 20, reducing the displacement or leakage of the diaphragm 20 under the drive of the piston 22. In addition, the support plate 40 is also used to protect and isolate the multiple chambers 21 of the diaphragm 20, reducing the phenomenon of the chambers 21 being tilted or interfering with each other under the drive of the piston 22.

[0065] like Figures 1 to 4 As shown, in some embodiments, the drive structure 32 is configured as a snap-fit ​​plate 321 connected to the drive mechanism 30. The snap-fit ​​plate 321 is provided with multiple snap-fit ​​holes 322 for snapping multiple pistons 22. The drive mechanism 30 drives at least a portion of the pistons 22 to move through the snap-fit ​​plate 321.

[0066] In the above embodiment, the retaining plate 321 simultaneously retains multiple pistons 22. The retaining plate 321 is connected to the narrow neck of the piston 22 of the diaphragm 20, so that the piston 22 can move up and down synchronously with the retaining plate 321. During the up and down movement of the piston 22, the volume of multiple chambers 21 is adjusted synchronously, thereby achieving the purpose of synchronously adjusting the capacity and pressure of multiple chambers 21 on the diaphragm 20, and achieving the purpose of fluid inlet and fluid outlet of the diaphragm pump 100.

[0067] The drive mechanism 30 includes a hydraulic mechanism, a pneumatic mechanism, a motor, and a linear motor.

[0068] like Figures 1 to 4 As shown, in some embodiments, the drive mechanism 30 is configured as a drive motor 31, and a transmission mechanism 33 is provided between the drive motor 31 and the card plate 321. The drive motor 31 drives the card plate 321 through the transmission mechanism 33 to drive at least part of the piston 22 to move.

[0069] In this embodiment, the drive motor 31 drives the card plate 321 through the transmission mechanism 33 to move at least part of the piston 22, thereby changing the total capacity and total pressure of the diaphragm 20. By changing the total capacity and total pressure of the diaphragm 20, the inlet valve 11 and the outlet valve 12 are switched on and off.

[0070] The transmission mechanism 33 includes a linkage mechanism, a gear mechanism, and an eccentric mechanism.

[0071] like Figures 1 to 4 As shown, in some embodiments, the transmission mechanism 33 includes an eccentric wheel 331, one end of which is connected to the output shaft of the drive motor 31, and the other end of which is connected to the card plate 321. The drive motor 31 drives the card plate 321 to rotate through the eccentric wheel 331.

[0072] In this embodiment, during the operation of the diaphragm pump 100, as the drive motor 31 rotates, it drives the eccentric wheel 331 to rotate as well. The eccentric wheel drives the retaining plate 321 to rotate. During the rotation, the retaining plate 321 drives the piston 22 to move up and down, so that the bottom and side wall of the chamber 21 of the diaphragm 20 move up and down synchronously, thereby changing the volume and pressure of the chamber 21.

[0073] The eccentric wheel 331 is set to be parallel or inclined relative to the diaphragm 20, so as to drive the piston 22 to move up and down in a regular manner.

[0074] like Figures 1 to 4 As shown, in some embodiments, the retaining plate 321 is configured to be inclined relative to the diaphragm 20. During rotation, the retaining plate 321 pushes a portion of the piston 22 and stretches another portion of the piston 22.

[0075] In this embodiment, during the operation of the diaphragm pump 100, as the drive motor 31 rotates, it drives the eccentric wheel 331 to rotate as well. The eccentric wheel drives the retaining plate 321 to swing up and down, and the retaining plate 321 drives the piston 22 to move up and down, so that the bottom and side wall of the chamber 21 of the diaphragm 20 move up and down synchronously, thereby changing the volume and pressure of the chamber 21.

[0076] Specifically, the snap-fit ​​plate 321 is provided with a plurality of protrusions 323 distributed along the periphery of the snap-fit ​​plate 321, each protrusion 323 is provided with a snap-fit ​​hole 322, and the bottom of the snap-fit ​​plate 321 is provided with a transmission rod 324 connected to the eccentric wheel 331.

[0077] like Figures 1 to 4 As shown, in some embodiments, both the inlet valve and the outlet valve 12 are configured as diaphragm valves, which open or close according to multiple pressures in the plurality of chambers 21.

[0078] In this embodiment, when negative pressure is generated in chamber 21, the inlet valve 11 on the diaphragm pump 100 opens, and gas or liquid flows into chamber 21 of the diaphragm 20 under the action of external atmospheric pressure. When chamber 21 is under negative pressure, the outlet valve 12 on the diaphragm pump 100 is closed. When positive pressure is generated in chamber 21 of the diaphragm 20, that is, when the internal pressure of chamber 21 is greater than the external pressure at the inlet valve 11 of the diaphragm pump 100, the inlet valve 11 on the diaphragm pump 100 closes, and the outlet valve 12 on the diaphragm pump 100 opens under pressure, so that the gas or liquid in chamber 21 of the diaphragm 20 is discharged from the outlet valve 12 of the diaphragm pump 100.

[0079] The diaphragm pump 100 proposed in this embodiment comprises a drive motor 31 and a pump body. The pump body consists of inlet / outlet covers 13, an outlet valve 12, a sealing ring 14, a base 10, an inlet valve 11, a diaphragm 20, a support plate 40, a retaining plate 321, and an eccentric wheel 331. The drive motor 31 is fixed to a fixed bracket 301. Inside the pump body, the eccentric wheel 331 is connected to the output shaft of the drive motor 31, and simultaneously, the eccentric wheel 331 is connected to the retaining plate 321 at a certain tilt angle. The retaining plate 321 is connected to the narrow neck of the piston 22 of the diaphragm 20, thereby enabling the piston 22 to move up and down synchronously with the retaining plate 321. During the operation of the diaphragm pump 100, as the drive motor 31 rotates, it drives the eccentric wheel 331 to rotate as well. The eccentric wheel drives the retaining plate 321 to swing, and the retaining plate 321 drives the piston 22 to move, so that the bottom and side wall of the chamber 21 of the diaphragm 20 move up and down synchronously, thereby changing the volume and pressure of the chamber 21.

[0080] The piston 22 drives the bottom and sidewalls of the diaphragm 20 to move up and down, causing a volume change in the chamber 21 of the diaphragm 20. The volume change causes the gas or liquid in the chamber 21 to generate positive or negative pressure. When negative pressure is generated in the chamber 21, the inlet valve 11 on the diaphragm pump 100 opens, and the gas or liquid flows into the chamber 21 of the diaphragm 20 under the action of the external atmospheric pressure. When the chamber 21 is under negative pressure, the outlet valve 12 on the diaphragm pump 100 is closed.

[0081] When a positive pressure is generated in the chamber 21 of the diaphragm 20, that is, when the pressure inside the chamber 21 is greater than the external pressure at the inlet valve 11 of the diaphragm pump 100, the inlet valve 11 of the diaphragm pump 100 closes, and the outlet valve 12 of the diaphragm pump 100 opens under pressure, so that the gas or liquid in the chamber 21 of the diaphragm 20 is discharged from the outlet valve 12 of the diaphragm pump 100.

[0082] From the above motion analysis, the eccentric wheel 331 and the retaining plate 321 can be considered as rigid motion, which can transfer the motion energy of the drive motor 31 to the next stage of motion without loss. The energy loss of rigid motion is small. The motion of the diaphragm 20, the inlet valve 11 and the outlet valve 12 is elastic motion. That is, part of the energy transferred by the retaining plate 321 is used to compress gas or liquid, thereby increasing the energy of the gas or liquid, such as increasing the pressure and speed of the gas or fluid. The other part of the energy is transferred to the rubber parts such as the diaphragm 20, the inlet valve 11 and the outlet valve 12. The rubber parts undergo deformation motion. Due to the motion hysteresis phenomenon of rubber material, this deformation energy is absorbed by the rubber molecules, generating internal energy of the rubber parts. This causes the rubber parts to heat up or break molecular bonds. This internal energy is useless work and has an adverse effect on the performance of the diaphragm pump 100, such as reducing the conveying performance. Therefore, to ensure that the diaphragm pump 100 has a high conveying efficiency, the key to improving the conveying efficiency of the diaphragm pump 100 lies in the design of the diaphragm 20, the inlet valve 11, and the outlet valve 12. In particular, the diaphragm 20 has the greatest impact on the conveying efficiency of the diaphragm pump 100. Therefore, the embodiments of this application mainly focus on the design of the key parameters of the diaphragm 20:

[0083] The flow rate formula for diaphragm pump 100 is: Q = A * S * n * η, where Q represents the flow rate of diaphragm pump 100, A is the area of ​​piston 22 (related to the diameter d of piston 22, A = (πd²) / 4), S represents the stroke of piston 22, n represents the speed of drive motor 31, η represents the volumetric efficiency of diaphragm pump 100, and the flow rate Q is the product of the above four factors.

[0084] Let the inner diameter of the chamber 21 of the diaphragm 20 be D, and the diameter of the piston 22 be d. The value of d / D is the key design value β. When the value of β is in the range of 0.2-0.4, the product of A*n is the largest and the flow rate Q is the largest. When β is 0.3, the pumping effect of the diaphragm pump 100 is the best and the efficiency is the highest.

[0085] A detailed analysis of the above parameters: When the design d / D value is relatively large, although the pumping volume per cycle is larger, the pumping process requires not only overcoming the pressure required to lose liquid but also overcoming the deformation of the diaphragm 20. The diaphragm pump 100 is driven by the drive motor 31. Based on the speed-torque characteristics of the drive motor 31, a larger d / D value requires increased torque and decreased speed. Therefore, when the design d / D value is relatively large, the flow rate formula is: Q = A * S * n * η, and the flow rate Q is not large.

[0086] Conversely, when the design d / D value is relatively small, the fluid pumped each time is the smallest, and the pressure work required to overcome the fluid is also small. According to the speed-torque characteristics of the drive motor 31, as the speed of the drive motor 31 increases, the flow rate formula is: Q=A*S*n*η. In fact, when the design d / D value is relatively small, the flow rate of the diaphragm pump 100 is not large, and the pumping efficiency is not the highest.

[0087] Based on the above analysis, there is a reasonable range for the d / D design, meaning the flow rate has a certain peak value within a certain range. When β is 0.3, the pumping efficiency is the highest, ensuring a reasonable pumping efficiency for the diaphragm pump 100. The study shows that when d / D is between 0.2 and 0.4, the pumping efficiency of the diaphragm pump 100 is relatively reasonable. A reasonable d / D value has the following beneficial effects:

[0088] When the design value of d / D is large, the stress and strain value of the main diaphragm is large. However, since the actual main diaphragm has a life curve with strain value and number of motions, when the strain value is greater than 30%, the number of motions of the main diaphragm of the self-priming pump may be less than the design life, resulting in cracking and leakage of the main diaphragm. When d / D is 0.2-0.4, the requirement that the strain of the main diaphragm is less than 30% is met, which meets the service life requirement of diaphragm 20.

[0089] The diaphragm 20 of the diaphragm pump 100 is generally made of rubber. Rubber is characterized by lower strength and greater softness at higher temperatures, making it prone to deformation. At lower operating temperatures, the diaphragm 20 exhibits increased hardness and strength, becoming less prone to deformation. Furthermore, due to the inherent characteristics of rubber material manufacturing and processing, the hardness and strength fluctuate significantly, exceeding 20%. When the design d / D value is large, the energy consumed by diaphragm 20 deformation is substantial. Changes in the strength and hardness of the diaphragm 20 affect the rotational speed of the diaphragm pump 100, resulting in significant flow rate fluctuations. Conversely, when the d / D value of the diaphragm 20 is relatively small, the impact on the flow rate of the diaphragm pump 100 is minimal.

[0090] The operating voltage of the drive motor 31 is within the upper and lower limits of the rated voltage. The difficulty in starting the diaphragm pump 100 mainly occurs at the lower limit of the rated voltage. When the design d / D value is relatively large, the diaphragm 20 is difficult to deform. Under adverse conditions, such as the diaphragm 20's material hardness being at the required upper limit, and under low temperature and low voltage conditions, the torque of the drive motor 31 decreases. When starting the drive motor 31 at low voltage, the diaphragm pump 100 may experience difficulty starting at low temperatures, or the drive motor 31 may stall, or even overheat and burn out. A d / D ratio of 0.2-0.4 can alleviate the problem of diaphragm 20 deformation difficulties, thus solving the problem of the diaphragm pump 100's difficulty in starting at low voltage.

[0091] It should be noted that the embodiments of this application do not limit the application scenarios of the diaphragm pump 100, because the embodiments of this application include a variety of products that use the diaphragm pump 100 of this application, such as water purifiers, dishwashers and air purifiers.

[0092] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A diaphragm pump characterized in that, The diaphragm pump (100) includes: A base (10) is provided with an inlet valve (11) and an outlet valve (12); A diaphragm (20) is provided with a plurality of chambers (21), and each chamber (21) is provided with a piston (22); The drive mechanism (30) is provided with a drive structure (32) that cooperates with the plurality of pistons (22). The drive mechanism (30) drives the plurality of pistons (22) through the drive structure (32) to adjust the plurality of pressures in the plurality of chambers (21). The diaphragm pump (100) opens the inlet valve (11) or the outlet valve (12) according to the changes in the plurality of pressures.

2. The membrane pump of claim 1, wherein, The inner diameter of the chamber (21) is set to D, and the diameter of the piston (22) is set to d, where 0.2≤d / D≤0.

4.

3. The membrane pump of claim 2, wherein, The diaphragm (20) is provided with a plurality of grooves recessed in the direction of the plurality of drive structures (32), and a plurality of chambers (21) are formed inside the plurality of grooves. The piston (22) is disposed at the bottom of the grooves and can adjust the pressure of the chambers (21) by pushing and pulling the grooves.

4. The membrane pump of claim 3, wherein, The piston (22) is integrally formed with the groove, and the bottom and sidewalls of the groove are configured as flexible connecting parts (211) connected to the piston (22). The piston (22) adjusts the pressure of the chamber (21) by pushing and pulling the bottom and sidewalls of the groove to deform.

5. The membrane pump of claim 3, wherein, The diaphragm pump (100) also includes a support plate (40), the support plate (40) is provided with a plurality of through holes (41), the periphery of the diaphragm (20) is attached to the outer edge of the support plate (40), the plurality of chambers (21) of the diaphragm (20) are provided in the plurality of through holes (41), and the plurality of pistons (22) of the diaphragm (20) extend out of the support plate (40) through the plurality of through holes (41).

6. The membrane pump of claim 1, wherein, The drive structure (32) is configured as a snap-fit ​​plate (321) connected to the drive mechanism (30). The snap-fit ​​plate (321) is provided with multiple snap-fit ​​holes (322) for snapping multiple pistons (22). The drive mechanism (30) drives at least a portion of the pistons (22) to move through the snap-fit ​​plate (321).

7. The membrane pump of claim 6, wherein, The drive mechanism (30) is configured as a drive motor (31), and a transmission mechanism (33) is provided between the drive motor (31) and the card plate (321). The drive motor (31) drives the card plate (321) through the transmission mechanism (33) to drive at least part of the piston (22) to move.

8. The membrane pump of claim 7, wherein, The transmission mechanism (33) includes an eccentric wheel (331), one end of which is connected to the output shaft of the drive motor (31), and the other end of which is connected to the retaining plate (321). The drive motor (31) drives the retaining plate (321) to rotate through the eccentric wheel (331).

9. The membrane pump of claim 8, wherein, The retaining plate (321) is set to be inclined relative to the diaphragm (20). During rotation, the retaining plate (321) pushes part of the piston (22) and stretches another part of the piston (22).

10. The membrane pump according to any one of claims 1 to 9, characterized in that, Both the inlet valve (11) and the outlet valve (12) are configured as diaphragm valves, which open or close according to the multiple pressures of the plurality of chambers (21).

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