Diaphragm pump

Abstract

The invention 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 technical field of household appliances, and particularly to a diaphragm pump. Background Art

[0002] For the diaphragm pump of the prior art, in order to increase the working flow rate of the diaphragm pump, methods such as increasing the cavity volume of the diaphragm of the diaphragm pump, increasing the piston area of the diaphragm pump, and increasing the motor power of the diaphragm pump are often adopted to achieve the purpose of increasing the working flow rate of the diaphragm pump. Unrestrictedly increasing the cavity volume of the diaphragm, increasing the piston area of the diaphragm pump, and increasing the motor power of the diaphragm pump will cause quality problems of the diaphragm pump, especially increasing the probability of failure of the diaphragm of the diaphragm pump. Summary of the Invention

[0003] In view of this, this application provides a diaphragm pump to solve the technical problem that the diaphragm pump in the prior art cannot balance the large flow rate requirement and the normal service performance of the diaphragm.

[0004] This application provides a diaphragm pump, which includes: a base provided with an inlet valve and an outlet valve; a diaphragm provided with a plurality of chambers, and each chamber is provided with a piston; a driving mechanism provided with a driving structure cooperating with the plurality of pistons, and the driving mechanism drives the plurality of pistons through the driving structure to adjust the pressures of the plurality of chambers, and the diaphragm pump opens the inlet valve or the outlet valve according to the changes of the plurality of pressures.

[0005] Beneficial Effects: The diaphragm pump proposed in this application can solve the problem of short service life of the diaphragm and the diaphragm pump without increasing the material cost, the overall volume of the machine, and the diaphragm area by optimizing the structural design of the diaphragm, so that the diaphragm pump can balance the large flow rate requirement and the normal service performance of the diaphragm.

[0006] Specifically, the piston drives the diaphragm to move up and down, resulting in a volume change in the chamber of the diaphragm. The volume change causes the gas or liquid in the chamber to generate positive pressure or negative pressure. When negative pressure is generated in the chamber, the inlet valve on the diaphragm pump opens, and the gas or liquid flows into the chamber of the diaphragm under the action of the external atmospheric pressure. When the chamber is in a negative pressure state, the outlet valve on the diaphragm pump is in a closed state. When positive pressure is generated in the chamber of the diaphragm, 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 chamber of the diaphragm is discharged from the outlet valve of the diaphragm pump.

[0007] In an optional embodiment, the inner diameter of the chamber is set to D, the diameter of the piston is set to d, and 0.2 ≤ d / D ≤ 0.4.

[0008] Beneficial effects: The d / D design has a reasonable value range, that is, the flow rate has a certain peak value within a certain value. When β is 0.3, the pumping efficiency is the highest, ensuring a reasonable pumping efficiency of the diaphragm pump. Research shows that when d / D is 0.2 - 0.4, the pumping efficiency of the diaphragm pump is relatively reasonable. The reasonable d / D value has the following beneficial effects: meeting the service life requirements of the diaphragm, reducing the flow rate fluctuation of the diaphragm pump, and solving the problem of difficult starting of the diaphragm pump at low voltage.

[0009] In an alternative embodiment, the diaphragm is provided with a plurality of grooves recessed in the direction of a plurality of driving structures. A plurality of chambers are formed inside the plurality of grooves. The piston is arranged at the bottom of the groove and can adjust the pressure of the chamber by pushing and pulling the groove.

[0010] Beneficial effects: A plurality of chambers are formed inside the plurality of grooves, which has the advantages of simple structure, easy manufacturing and volume adjustment. Moreover, the compression and stretching operations of the grooves are relatively simple, solving the problem of easy failure of complex drives.

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

[0012] Beneficial effects: During the operation of the diaphragm pump, as the driving mechanism moves, the driving mechanism drives the piston to drive the diaphragm to move up and down, so that the bottom and side walls of the chamber of the diaphragm move up and down synchronously, thereby achieving the purpose of changing the volume and pressure of the chamber. Setting the piston and the groove to be integrally formed has the advantages of simple structure and easy operation, and there is no need to consider the sealing factor between the piston and the groove.

[0013] In an alternative embodiment, the diaphragm pump further includes a support plate. The support plate is provided with a plurality of through holes. The periphery of the diaphragm is set on the outer edge of the support plate. The plurality of chambers of the diaphragm are arranged in the plurality of through holes, and the plurality of pistons of the diaphragm extend out of the support plate through the plurality of through holes.

[0014] Beneficial effects: The support plate is used to support and fix the diaphragm, reducing the phenomenon of displacement or leakage of the diaphragm driven by the piston. In addition, the support plate is also used to protect and isolate the plurality of chambers of the diaphragm, reducing the phenomenon of skew or mutual interference of the chambers driven by the piston.

[0015] In an alternative embodiment, the driving structure is arranged as a clamping plate connected to the driving mechanism. The clamping plate is provided with a plurality of clamping holes for clamping a plurality of pistons. The driving mechanism drives at least part of the pistons to move through the clamping plate.

[0016] Beneficial effects: The clamping disc clamps multiple pistons simultaneously. The clamping disc is connected to the thin-neck part of the pistons of the diaphragm, so that the pistons can move up and down synchronously with the clamping disc. During the up and down movement of the pistons, the volumes of multiple chambers are synchronously adjusted, so as to achieve the purpose of synchronously adjusting the capacities and pressures of multiple chambers on the diaphragm, and achieve the purpose of inlet and outlet fluid of the diaphragm pump.

[0017] In an alternative embodiment, the driving mechanism is arranged as a driving motor, and a transmission mechanism is arranged between the driving motor and the clamping disc. The driving motor drives the clamping disc to drive at least some of the pistons to move through the transmission mechanism.

[0018] Beneficial effects: The driving motor drives the clamping disc to drive at least some of the pistons to move through the transmission mechanism, so as to achieve the purpose of changing the total capacity and total pressure of the diaphragm. By changing the total capacity and total pressure of the diaphragm, the purpose of opening and closing the inlet valve and the outlet valve is achieved.

[0019] In an alternative embodiment, the transmission mechanism includes an eccentric wheel. One end of the eccentric wheel is connected to the output shaft of the driving motor, and the other end of the eccentric wheel is arranged to be connected to the clamping disc. The driving motor drives the clamping disc to rotate through the eccentric wheel.

[0020] Beneficial effects: During the operation of the diaphragm pump, as the driving motor makes a rotational motion, it drives the eccentric wheel to rotate together. The eccentric rotation drives the clamping disc to rotate. During the rotation of the clamping disc, it drives the pistons to move up and down, so that the bottom and side walls of the chambers of the diaphragm move up and down synchronously, so as to achieve the purpose of changing the volume and pressure of the chambers.

[0021] In an alternative embodiment, the clamping disc is arranged to be inclined relative to the diaphragm. During the rotation of the clamping disc, it pushes some of the pistons and stretches the other part of the pistons.

[0022] Beneficial effects: During the operation of the diaphragm pump, as the driving motor makes a rotational motion, it drives the eccentric wheel to rotate together. The eccentric rotation drives the clamping disc to swing up and down. The clamping disc drives the pistons to move up and down, so that the bottom and side walls of the chambers of the diaphragm move up and down synchronously, so as to achieve the purpose of changing the volume and pressure of the chambers.

[0023] In an alternative embodiment, both the inlet valve and the outlet valve are arranged as diaphragm valves, and the diaphragm valves open or close according to the pressures of the multiple chambers.

[0024] Beneficial effects: When a negative pressure is generated in the chamber, the inlet valve on the diaphragm pump opens, and gas or liquid flows into the chamber of the diaphragm under the action of the external atmospheric pressure. When the chamber is in a negative pressure state, the outlet valve on the diaphragm pump is in a closed state; when a positive pressure is generated in the chamber of the diaphragm, 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 chamber of the diaphragm is discharged from the outlet valve of the diaphragm pump. Description of the Drawings

[0025] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0026] Figure 1 Exploded view of the diaphragm pump according to an embodiment of the present application;

[0027] Figure 2 is Figure 1 Assembly guiding diagram of the shown diaphragm pump;

[0028] Figure 3 Cross-sectional view of the diaphragm pump according to an embodiment of the present application;

[0029] Figure 4 Partial structural schematic diagram of the diaphragm pump according to an embodiment of the present application;

[0030] Figure 5 Structural schematic diagram of the diaphragm according to an embodiment of the present application;

[0031] Figure 6 is Figure 5 Bottom view of the shown diaphragm;

[0032] Figure 7 Piston running stroke diagram of the diaphragm according to an embodiment of the present application;

[0033] Figure 8 Partial cross-sectional view of the diaphragm according to an embodiment of the present application.

[0034] Description of the reference numerals:

[0035] 100, diaphragm pump;

[0036] 10, base; 11, inlet valve; 12, outlet valve; 13, water inlet and outlet cover; 14, sealing ring;

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

[0038] 30. Driving mechanism; 301. Fixed bracket; 31. Driving motor; 32. Driving structure; 321. Clamping disc; 322. Clamping hole; 323. Protrusion; 324. Transmission rod; 33. Transmission mechanism; 331. Eccentric wheel;

[0039] 40. Support disc; 41. Through hole. Detailed implementation manner

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

[0041] In the description of this application, it should be noted that the orientation or positional relationship indicated by the terms "inside", "above", "outside", "below", "underneath", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0042] In the description of this application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "communicated" should be understood in a broad sense. For example, it can be fixedly connected, detachably connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediate medium, and can also be the connection inside two elements. It can be wirelessly connected or wired connected. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0043] It has been found through research that in order to meet the large-flow requirements of a diaphragm pump, unrestrictedly increasing the cavity volume of the diaphragm, increasing the piston area of the diaphragm pump, and increasing the motor power of the diaphragm pump will cause the following quality problems with the diaphragm of the diaphragm pump:

[0044] The diaphragm is excessively deformed, with large stress and strain, resulting in a low service life of the core component, the diaphragm, and being prone to cracking and water leakage problems;

[0045] The diaphragm deforms significantly, and the deformation force and deformation work increase synchronously. At the same time, the diaphragm material is a rubber part. Due to manufacturing reasons, the hardness of the rubber part material fluctuates within a large range, and hardness is proportional to strength, resulting in a large fluctuation in the work required for the diaphragm to deform. The flow rate of the diaphragm pump fluctuates greatly. For example, at a high temperature of 40°C and a low temperature environment of 4°C, the flow rate of the diaphragm pump fluctuates greatly, exceeding the set requirements, leading to unqualified flow rate of the diaphragm pump and even having a greater impact on the overall flow rate performance of the diaphragm pump.

[0046] When the deformation work of the diaphragm is large, it causes the low-voltage start performance of the diaphragm pump to deteriorate or even fail to start, affecting the lifespan of the low-voltage DC motor of the diaphragm pump and even resulting in the phenomenon of burning out the low-voltage DC motor of the diaphragm pump.

[0047] The flow rate of the diaphragm pump is generally controlled by adjusting the voltage of the diaphragm pump. When the deformation work of the diaphragm is large, it is likely to cause the problem that the flow rate of the diaphragm pump is not directly proportional to the voltage. Therefore, the difficulty of controlling the flow rate of the diaphragm pump by adjusting the voltage of the diaphragm pump increases.

[0048] Therefore, the structural characteristics of the diaphragm of the diaphragm pump are the key factors affecting the performance of the diaphragm pump. By studying the structural characteristics of the diaphragm pump and identifying the key influencing factors of the diaphragm, the problems of low lifespan, large flow rate fluctuation, difficult flow rate control, and difficult low-voltage start of the diaphragm pump can be solved.

[0049] To solve the problem that the existing diaphragm pump cannot balance the large flow rate demand and the normal service performance of the diaphragm, the embodiment of this application proposes a diaphragm pump. The following combines Figures 1 to 8 to describe the embodiments of this application.

[0050] As Figures 1 to 8 shown, according to the embodiment of this application, this application provides a diaphragm pump 100, which includes: a base 10, and an inlet valve 11 and an outlet valve 12 are arranged on the base 10; a diaphragm 20, the diaphragm 20 is provided with a plurality of chambers 21, and each chamber 21 is provided with a piston 22; a driving mechanism 30, the driving mechanism 30 is provided with a driving structure 32 that cooperates with the plurality of pistons 22, and the driving mechanism 30 drives the plurality of pistons 22 through the driving structure 32 to adjust the pressures of the plurality of chambers 21, and the diaphragm pump 100 opens 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 the embodiment of this application optimizes the structural design of the diaphragm 20, and can solve the problem of the short lifespan of the diaphragm 20 and the diaphragm pump 100 without increasing the material cost, the overall volume, and the area of the diaphragm 20, so that the diaphragm pump 100 can balance the large flow rate demand and the normal service performance of the diaphragm 20.

[0052] In addition, due to objective reasons in the manufacturing control of the diaphragm 20, there are significant fluctuations in the hardness of the diaphragm 20, resulting in temperature fluctuations during the use of the diaphragm pump 100 that can affect the hardness of the diaphragm 20. In the embodiments of the present application, by optimizing the structural design of the diaphragm 20, the phenomenon of fluctuations in the working flow rate of the diaphragm pump 100 caused by fluctuations in the hardness of the diaphragm 20 is reduced, so that the product performance of the diaphragm pump 100 can maintain high consistency.

[0053] Furthermore, through the optimization of the structural design of the diaphragm 20, the risk that the diaphragm pump 100 cannot start under low pressure is reduced, and the phenomenon of the driving mechanism 30 being burned out due to locked rotor is reduced.

[0054] It should be noted that the embodiments of the present application do not limit the specific structures of the diaphragm 20 and the driving mechanism 30 because the improvement point of this embodiment lies in that the driving mechanism 30 drives a plurality of pistons 22 through the driving structure 32 to adjust the pressures of a plurality of chambers 21, so that the diaphragm pump 100 opens the inlet valve 11 or the outlet valve 12 according to the changes in the plurality of pressures. As for the specific structures of the diaphragm 20 and the driving mechanism 30, they can be set according to the type of the diaphragm pump 100 and the actual use environment. For example, the diaphragm 20 can be set as an integral structure or an assembled structure, and the driving mechanism 30 can be set as a connecting rod mechanism, a gear mechanism, or an eccentric mechanism. These adjustments all fall within the protection scope of the embodiments of the present application.

[0055] Next, through Figures 1 to 8 the following embodiments, the preferred embodiments of the specific structure of the diaphragm pump 100 will be described.

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

[0057] In this embodiment, there is a reasonable value range for d / D, that is, the flow rate has a certain peak value within a certain value. When β is 0.3, the pumping efficiency is the highest, ensuring a reasonable pumping efficiency of the diaphragm pump 100. It is studied that when d / D is 0.2 - 0.4, the pumping efficiency of the diaphragm pump 100 is relatively reasonable. The reasonable d / D value produces the following beneficial effects: meeting the service life requirements of the diaphragm 20, reducing the flow rate fluctuations of the diaphragm pump 100, and solving the problem of difficult starting of the diaphragm pump 100 at low voltage.

[0058] As Figures 4 to 8 shown, in some embodiments, the diaphragm 20 is provided with a plurality of grooves recessed in the direction of a plurality of driving structures 32. 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, a plurality of chambers 21 are formed inside the plurality of grooves, which has the advantages of simple structure, easy manufacturing and volume adjustment. Moreover, the compression and stretching operations of the grooves are relatively simple, solving the problem of easy failure of complex drives.

[0060] Specifically, the diaphragm 20 and the plurality of grooves are provided as an integral structure, which not only has the advantages of simple structure and low manufacturing difficulty, but also has good sealing performance. Among them, the grooves include a rectangular structure and a circular structure.

[0061] As Figures 4 to 8 shown, in some embodiments, the piston 22 is provided to be integrally formed with the groove, and the bottom and side walls of the groove are provided with flexible connecting portions 211 connected to the piston 22. The piston 22 adjusts the pressure of the chamber 21 by deforming the bottom and side walls of the pushed and pulled groove.

[0062] In this embodiment, during the operation of the diaphragm pump 100, as the driving mechanism 30 moves, the driving mechanism 30 drives the piston 22 to drive the diaphragm 20 to move up and down, so that the bottom and side walls of the chamber 21 of the diaphragm 20 move up and down synchronously, thereby achieving the purpose of changing the volume and pressure of the chamber 21. Setting the piston 22 and the groove to be integrally formed has the advantages of simple structure and easy operation, and the sealing factor between the piston 22 and the groove does not need to be considered.

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

[0064] In the above embodiments, the support disk 40 is used to support and fix the diaphragm 20, reducing the phenomenon of displacement or leakage of the diaphragm 20 driven by the piston 22. In addition, the support disk 40 is also used to protect and isolate the plurality of chambers 21 of the diaphragm 20, reducing the phenomenon of skew or mutual interference of the chambers 21 driven by the piston 22.

[0065] As Figures 1 to 4 shown, in some embodiments, the driving structure 32 is provided as a clamping disk 321 connected to the driving mechanism 30. The clamping disk 321 is provided with a plurality of clamping holes 322 for clamping a plurality of pistons 22. The driving mechanism 30 drives at least part of the pistons 22 to move through the clamping disk 321.

[0066] In the above embodiment, the clamping disc 321 clamps a plurality of pistons 22 simultaneously. The clamping disc 321 is connected to the neck portions of the pistons 22 of the diaphragm 20, so that the pistons 22 can move up and down synchronously with the clamping disc 321. During the up and down movement of the pistons 22, the volumes of a plurality of chambers 21 are synchronously adjusted, so as to achieve the purpose of synchronously adjusting the capacities and pressures of the plurality of chambers 21 on the diaphragm 20, and achieve the purpose of inlet and outlet fluid of the diaphragm pump 100.

[0067] Among them, the driving mechanism 30 includes a hydraulic mechanism, a pneumatic mechanism, a motor, a linear motor, etc.

[0068] Such as Figures 1 to 4 As shown, in some embodiments, the driving mechanism 30 is set as a driving motor 31. A transmission mechanism 33 is arranged between the driving motor 31 and the clamping disc 321. The driving motor 31 drives the clamping disc 321 to drive at least some of the pistons 22 to move through the transmission mechanism 33.

[0069] In this embodiment, the driving motor 31 drives the clamping disc 321 to drive at least some of the pistons 22 to move through the transmission mechanism 33, so as to achieve the purpose of changing the total capacity and total pressure of the diaphragm 20. By changing the total capacity and total pressure of the diaphragm 20, the purpose of switching the inlet valve 11 and the outlet valve 12 is achieved.

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

[0071] Such as Figures 1 to 4 As shown, in some embodiments, the transmission mechanism 33 includes an eccentric wheel 331. One end of the eccentric wheel 331 is connected to the output shaft of the driving motor 31, and the other end of the eccentric wheel 331 is set to be connected to the clamping disc 321. The driving motor 31 drives the clamping disc 321 to rotate through the eccentric wheel 331.

[0072] In this embodiment, during the operation of the diaphragm pump 100, as the driving motor 31 rotates, it drives the eccentric wheel 331 to rotate together. The eccentric rotation drives the clamping disc 321 to rotate. During the rotation of the clamping disc 321, it drives the pistons 22 to move up and down, so that the bottom and side walls of the chambers 21 of the diaphragm 20 move up and down synchronously, so as to achieve the purpose of changing the volume and pressure of the chambers 21.

[0073] The eccentric wheel 331 is set to be arranged parallel or inclined relative to the diaphragm 20, so as to achieve the purpose of driving the pistons 22 to move up and down regularly.

[0074] Such as Figures 1 to 4 As shown, in some embodiments, the clamping disc 321 is set to be inclined relative to the diaphragm 20. During the rotation of the clamping disc 321, it presses some of the pistons 22 and stretches the other part of the pistons 22.

[0075] In this embodiment, during the operation of the diaphragm pump 100, as the driving motor 31 rotates, the eccentric wheel 331 is driven to rotate together. The eccentric rotation drives the clamping disk 321 to swing up and down, and the clamping disk 321 drives the piston 22 to move up and down, so that the bottom and side walls of the chamber 21 of the diaphragm 20 move up and down synchronously, thereby achieving the purpose of changing the volume and pressure of the chamber 21.

[0076] Specifically, the clamping disk 321 is provided with a plurality of protrusions 323 distributed along the periphery of the clamping disk 321. Each protrusion 323 is provided with a clamping hole 322, and a transmission rod 324 connected to the eccentric wheel 331 is provided at the bottom of the clamping disk 321.

[0077] As Figures 1 to 4 shown, in some embodiments, the inlet valve and the outlet valve 12 are both provided as diaphragm valves, and the diaphragm valves are opened or closed according to the pressures of the plurality of chambers 21.

[0078] In this embodiment, when a negative pressure is generated in the chamber 21, the inlet valve 11 on the diaphragm pump 100 is opened, and 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 in a negative pressure state, the outlet valve 12 on the diaphragm pump 100 is in a closed state; when a positive pressure is generated in the chamber 21 of the diaphragm 20, that is, when the internal pressure of the 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 is closed, and the outlet valve 12 on the diaphragm pump 100 is opened 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.

[0079] The diaphragm pump 100 proposed in the embodiment of the present application is composed of a driving motor 31 and a pump body. Among them, the pump body is composed of a water inlet and outlet cover 13, an outlet valve 12, a sealing ring 14, a base 10, an inlet valve 11, a diaphragm 20, a support disk 40, a clamping disk 321, an eccentric wheel 331 and other structures. The driving motor 31 is fixed to the fixed bracket 301. Inside the pump body, the eccentric wheel 331 is connected to the output shaft of the driving motor 31. At the same time, the eccentric wheel 331 is connected to the clamping disk 321 at a certain inclination angle, and the clamping disk 321 is connected to the thin neck part of the piston 22 of the diaphragm 20, so that the piston 22 can move up and down synchronously with the clamping disk 321. During the operation of the diaphragm pump 100, as the driving motor 31 rotates, the eccentric wheel 331 is driven to rotate together. The eccentric rotation drives the clamping disk 321 to swing, and the clamping disk 321 drives the piston 22 to move, so that the bottom and side walls of the chamber 21 of the diaphragm 20 move up and down synchronously, thereby achieving the purpose of changing the volume and pressure of the chamber 21.

[0080] The piston 22 drives the bottom and side walls of the diaphragm 20 to move up and down, resulting in a volume change in the chamber 21 of the diaphragm 20. The volume change causes a positive or negative pressure in the gas or liquid within the chamber 21. When a negative pressure is generated within 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 in a negative pressure state, the outlet valve 12 on the diaphragm pump 100 is in a closed state.

[0081] When a positive pressure is generated within the chamber 21 of the diaphragm 20, that is, when the internal pressure of the 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, causing the gas or liquid within the chamber 21 of the diaphragm 20 to be discharged from the outlet valve 12 of the diaphragm pump 100.

[0082] From the above motion analysis, the eccentric wheel 331 and the clamping disc 321 can be regarded as rigid motions, which can transmit the motion energy of the drive motor 31 to the next stage of motion without loss, and the energy loss of the rigid motion is small; the motions of the diaphragm 20, the inlet valve 11, and the outlet valve 12 are elastic motions, that is, part of the energy transmitted by the clamping disc 321 is used to compress the gas or liquid, increasing the energy of the gas or liquid, such as increasing the pressure and speed of the gas or fluid; another part of the energy is transmitted to rubber parts such as the diaphragm 20, the inlet valve 11, and the outlet valve 12. The rubber parts undergo deformation motions. Due to the motion lag phenomenon of the rubber material, this deformation energy is absorbed by the internal rubber molecules, generating the internal energy of the rubber parts, causing the temperature of the rubber parts to rise, or the molecular bonds to be damaged, etc. 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 is 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, in the embodiments of the present application, the key parameters of the diaphragm 20 are mainly designed:

[0083] The flow formula of the diaphragm pump 100: Q = A * S * n * η, where Q represents the flow rate of the diaphragm pump 100, A represents the area of the piston 22 (related to the diameter d of the piston 22, A = (Πd 2) / 4), S represents the stroke of the piston 22, n represents the rotational speed of the drive motor 31, and η represents the volumetric efficiency of the diaphragm pump 100. 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. Among them, the value of d / D is the key design value β. When the range of the β value is 0.2 - 0.4, the product of A * n is the largest, and the value of the flow rate Q is larger. When β is 0.3, the pumping effect of the diaphragm pump 100 is the best and the efficiency is the highest;

[0085] Specific analysis of the above parameters: When the designed d / D value is relatively large, although the pumping volume per time is relatively large, during the pumping process, not only the work done to overcome the pressure required to lose the liquid needs to be overcome, but also the work done to overcome the deformation of the diaphragm 20 needs to be overcome, and the driving motor 31 is used to drive the diaphragm pump 100 to operate. According to the speed-torque characteristics of the driving motor 31, when the d / D value is relatively large, the required torque increases and the speed decreases. Therefore, when the designed d / D value is relatively large, the flow formula: Q = A * S * n * η, the flow rate Q is not large.

[0086] On the contrary, when the designed d / D value is relatively small, the volume of fluid pumped each time is relatively small, and the work done to overcome the pressure required for the fluid is also relatively small. According to the speed-torque characteristics of the driving motor 31, the speed of the driving motor 31 increases, and the flow formula: Q = A * S * n * η. In fact, when the designed 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 value range for the d / D design, that is, there is a certain peak value within a certain value for the flow rate. When β is 0.3, the pumping efficiency is the highest. To ensure the reasonable pumping efficiency of the diaphragm pump 100, it is studied that when d / D is 0.2 - 0.4, the pumping efficiency of the diaphragm pump 100 is relatively reasonable. The reasonable d / D value has the following beneficial effects:

[0088] When the designed d / D value is relatively large, the stress and strain values of the main diaphragm are relatively large. And for the actual main diaphragm, since the strain value has a life curve with the number of movements, when the strain value is greater than 30%, the number of movements of the main diaphragm of the self-priming pump may be less than the designed life, resulting in problems such as cracking and water leakage of the main diaphragm. When d / D is 0.2 - 0.4, it meets the requirement that the strain of the main diaphragm is less than 30%, that is, it meets the service life requirement of the diaphragm 20.

[0089] The diaphragm 20 of the diaphragm pump 100 is generally made of rubber material. The characteristic of the rubber material is that at a relatively high temperature, the material strength is relatively low, it is relatively soft and easy to deform. When the use temperature is relatively low, the hardness and strength of the diaphragm 20 increase and it is not easy to deform. In addition, due to the objective reasons of the production and process characteristics of the rubber material, the fluctuation value of the material hardness and strength is relatively large, reaching more than 20%. When the designed d / D value is relatively large, the work consumed by the deformation of the diaphragm 20 accounts for a relatively large proportion. When the strength and hardness of the diaphragm 20 change, it affects the change of the speed of the diaphragm pump 100, and the flow rate fluctuates greatly. On the contrary, when the d / D value of the diaphragm 20 is relatively small, the influence on the flow rate of the diaphragm pump 100 is relatively small;

[0090] The operating voltage of the drive motor 31 is within the upper and lower limits of the rated voltage. The main problem with the difficult start of the diaphragm pump 100 occurs at the lower limit of the rated voltage. When the design value of d / D is relatively large, it is difficult for the diaphragm 20 to deform. Under the superposition of harsh conditions, such as the hardness of the production material of the diaphragm 20 being at the upper limit of the requirement; and under low-temperature conditions and low-voltage conditions, the torque of the drive motor 31 decreases. When the drive motor 31 starts at low voltage, there are difficulties in starting the diaphragm pump 100 at low temperature, or the drive motor 31 is blocked, and even the drive motor 31 overheats and burns out. When d / D is 0.2 - 0.4, it can alleviate the problem of difficult deformation of the diaphragm 20, thus solving the problem of difficult start of the diaphragm pump 100 at low voltage.

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

[0092] Although the embodiments of the present 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 the present application, and such modifications and variations 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), the base (10) is provided with an inlet valve (11) and an outlet valve (12); A diaphragm (20), the diaphragm (20) is provided with a plurality of chambers (21), and each of the chambers (21) is provided with a piston (22); A driving mechanism (30), the driving mechanism (30) is provided with a driving structure (32) that cooperates with the plurality of pistons (22), and the driving mechanism (30) drives the plurality of pistons (22) through the driving structure (32) to adjust the pressures of the plurality of chambers (21), and 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 diaphragm pump according to claim 1, characterized in that, The inner diameter of the chamber (21) is set to D, the diameter of the piston (22) is set to d, and 0.2 ≤ d / D ≤ 0.

4.

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

4. The diaphragm pump according to claim 3, wherein The piston (22) is set to be integrally formed with the groove, and the bottom and side walls of the groove are provided with flexible connecting portions (211) connected to the piston (22). The piston (22) adjusts the pressure of the chamber (21) by deforming the bottom and side walls of the groove by pushing and pulling.

5. The diaphragm pump according to claim 3, wherein, The diaphragm pump (100) further includes a support disk (40), the support disk (40) is provided with a plurality of through holes (41), the periphery of the diaphragm (20) is erected on the outer edge of the support disk (40), the plurality of chambers (21) of the diaphragm (20) are arranged in the plurality of through holes (41), and the plurality of pistons (22) of the diaphragm (20) extend out of the support disk (40) through the plurality of through holes (41).

6. The diaphragm pump according to claim 1, wherein The driving structure (32) is set to be a clamping disk (321) connected to the driving mechanism (30), the clamping disk (321) is provided with a plurality of clamping holes (322) for clamping the plurality of pistons (22), and the driving mechanism (30) drives at least part of the pistons (22) to move through the clamping disk (321).

7. The diaphragm pump according to claim 6, wherein The driving mechanism (30) is set to be a driving motor (31), and a transmission mechanism (33) is arranged between the driving motor (31) and the clamping disk (321). The driving motor (31) drives the clamping disk (321) to drive at least part of the pistons (22) to move through the transmission mechanism (33).

8. The diaphragm pump according to claim 7, characterized in that, The transmission mechanism (33) includes an eccentric wheel (331), one end of the eccentric wheel (331) is connected to the output shaft of the driving motor (31), the other end of the eccentric wheel (331) is set to be connected to the clamping disk (321), and the driving motor (31) drives the clamping disk (321) to rotate through the eccentric wheel (331).

9. The diaphragm pump according to claim 8, characterized in that, The clamping disc (321) is arranged to be inclined relative to the diaphragm (20), and during the rotation of the clamping disc (321), part of the piston (22) is pushed and another part of the piston (22) is stretched.

10. The diaphragm pump according to any one of claims 1 to 9, characterized in that, Both the inlet valve (11) and the outlet valve (12) are arranged as diaphragm valves, and the diaphragm valves are opened or closed according to the pressures in the plurality of chambers (21).

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