A diaphragm stroke control system

Abstract

The application provides a diaphragm stroke control system, comprising a first electromagnetic valve, a second electromagnetic valve, an oil supplementing device, an oil discharging device and a diaphragm position detection device, the oil supplementing device comprises a one-way valve and a first valve structure connected with each other, the oil discharging device comprises a second valve structure, the diaphragm position detection device determines an oil supplementing signal and an oil discharging signal based on position information of a diaphragm in a diaphragm pump, the first electromagnetic valve controls the first valve structure to switch to an open state based on the oil supplementing signal, and the second electromagnetic valve controls the second valve structure to switch to an open state based on the oil discharging signal.The diaphragm stroke control system of the application judges whether the diaphragm position of the diaphragm pump is within an allowable range according to the diaphragm position detection device, and issues an oil supplementing signal and / or an oil discharging signal when the diaphragm position exceeds the allowable range, so that the diaphragm pump is supplemented with oil and / or discharged with oil correspondingly; the overall structure of the application is simpler, and equipment space is saved; the application reduces the failure rate and improves the reliability of the overall equipment.

Description

Technical Field

[0001] This invention relates to the field of diaphragm pump oil replenishment and discharge technology, and more specifically, to a diaphragm stroke control system. Background Technology

[0002] A diaphragm pump is a reciprocating positive displacement pump. Its structure incorporates a diaphragm and propellant fluid to isolate the pumped slurry from the reciprocating piston (or plunger), enabling it to withstand harsh conditions such as abrasion and corrosion. The diaphragm and its stroke control system are the core and key technologies of the diaphragm pump. The diaphragm is typically a circular sheet with a detection rod connected to its center that moves linearly back and forth with the diaphragm. The diaphragm position is acquired through mechanical switches, electromagnetic switches, displacement sensors, etc., and determined by the electronic control system. When the diaphragm exceeds its allowable deformation range, a signal to replenish or discharge oil is issued. In existing technologies, the oil replenishment / discharge actuator typically employs a pneumatic system, consisting of an air source, a pneumatic solenoid valve, and a pneumatically controlled oil replenishment / discharge valve. The pneumatically controlled oil replenishment / discharge valve is usually a normally open two-position two-way valve. On the one hand, pneumatic solutions require an external air source, which makes the overall structure of the equipment more complex and occupies more equipment space; on the other hand, normally open pneumatic control oil replenishment valves may malfunction in the event of power failure, air supply failure, or oil supply failure, resulting in high equipment failure rate and poor reliability. Summary of the Invention

[0003] The main objective of this invention is to provide a diaphragm stroke control system to solve at least one of the technical problems of pneumatic oil supply and discharge valves having complex structures and occupying a lot of equipment space, and normally open oil supply and discharge valves having high failure rates and poor reliability.

[0004] To achieve the above objectives, the present invention provides a diaphragm stroke control system, including a first solenoid valve, a second solenoid valve, an oil replenishment device, an oil discharge device, and a diaphragm position detection device. The oil replenishment device includes a one-way valve and a first valve structure connected to each other, and the oil discharge device includes a second valve structure. The diaphragm position detection device determines an oil replenishment signal and an oil discharge signal based on the position information of the diaphragm in the diaphragm pump. The first solenoid valve controls the first valve structure to switch to the open state based on the oil replenishment signal, and the second solenoid valve controls the second valve structure to switch to the open state based on the oil discharge signal.

[0005] Furthermore, both the first valve structure and the second valve structure adopt a replenishment / drainage valve structure, which includes: a valve body, the valve body having a first oil port, a second oil port, a hydraulic control port, and a first sliding cavity; a valve core, the valve core having a driving part and a sealing part, the driving part being slidably disposed in the first sliding cavity to switch to an open state or a closed state, in the open state the first oil port and the second oil port are connected, in the closed state the sealing part seals and isolates the first oil port and the second oil port; an elastic element, the elastic element being disposed in the first sliding cavity and located on one side of the driving part, for driving the driving part to slide to the closed state, the hydraulic control port being disposed corresponding to the side of the driving part away from the elastic element, the liquid in the hydraulic control port being used to drive the driving part to slide to the open state.

[0006] Furthermore, a valve cover is connected to the valve body, and the elastic element is connected between the valve cover and the drive unit.

[0007] Furthermore, the elastic element is a disc spring, and a connecting post is connected to the driving part, with the disc spring sleeved on the connecting post.

[0008] Furthermore, the valve cover is provided with a limiting groove communicating with the first sliding cavity, and the end of the connecting column is used to abut against the inner wall of the limiting groove.

[0009] Furthermore, the valve cover is provided with a connecting hole, the limiting groove is connected to the inner cavity of the disc spring, one end of the connecting hole is connected to the limiting groove, and the other end of the connecting hole is connected to the first sliding cavity outside the disc spring. The valve body is provided with a vent hole, and the vent hole is connected to the first sliding cavity outside the disc spring.

[0010] Furthermore, a valve seat is connected to the valve body, and the second oil port is opened on the valve seat. In the closed state, the sealing part seals the second oil port.

[0011] Furthermore, the valve seat is provided with a convex spherical surface, the second oil port is opened at the convex spherical surface, and the sealing part is provided with a sealing gasket to make sealing contact with the convex spherical surface.

[0012] Furthermore, the elastic element is disposed between the valve cover and the drive unit with a preset compression amount.

[0013] Furthermore, the valve body is provided with a hydraulic control chamber and a connecting chamber. The hydraulic control chamber is connected to the hydraulic control port. The hydraulic control chamber is disposed on the side of the drive unit away from the elastic element. The first oil port and the second oil port are connected through the connecting chamber. The valve body forms a second sliding chamber between the hydraulic control chamber and the connecting chamber. The sealing part is slidably disposed in the second sliding chamber.

[0014] The diaphragm stroke control system of the present invention can determine whether the diaphragm position of the diaphragm pump is within the allowable range based on the diaphragm position detection device. When the diaphragm position exceeds the allowable range, it issues a replenishment signal and / or a discharge signal. The first solenoid valve controls the first valve structure to switch to the open state based on the replenishment signal, thereby replenishing oil to the diaphragm pump. The second solenoid valve controls the second valve structure to switch to the open state based on the discharge signal, thereby discharging oil from the diaphragm pump. This controls the stroke of the diaphragm pump diaphragm, ensuring that the diaphragm deforms within the allowable range. Furthermore, compared to the pneumatic replenishment and discharge valve schemes in traditional technologies, the first and second valve structures of the present invention adopt a hydraulic control form, eliminating the need to add a pneumatic structure to the existing hydraulic system, resulting in a simpler overall structure and saving equipment space. Moreover, compared to the normally open replenishment and discharge valves in traditional technologies, the first and second valve structures of the present invention are normally closed structures. In the event of power failure, oil supply failure, or other situations, the first and second valve structures can remain closed, preventing the hydraulic equipment from becoming uncontrollable and causing greater failures, reducing the failure rate, and improving the overall reliability of the equipment. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0016] Figure 1 This is a cross-sectional schematic diagram of the oil replenishment and discharge valve structure provided in an embodiment of the present invention;

[0017] Figure 2 This is a schematic diagram of the diaphragm stroke control system provided in an embodiment of the present invention.

[0018] The above figures include the following reference numerals:

[0019] 1. Valve body; 11. First oil port; 12. Valve seat; 121. Second oil port; 122. Convex spherical surface; 13. Hydraulic control port; 14. First sliding cavity; 15. Valve cover; 151. Limiting groove; 152. Connecting hole; 16. Vent hole; 17. Hydraulic control cavity; 18. Connecting cavity; 19. Second sliding cavity; 2. Valve core; 21. Drive unit; 211. Connecting column; 22. Sealing unit; 3. Elastic element; 31. Disc spring;

[0020] 01. Diaphragm pump; 02. First solenoid valve; 03. Second solenoid valve; 04. Oil replenishment device; 041. Check valve; 042. First valve structure; 05. Oil discharge device; 051. Second valve structure; 06. Diaphragm position detection device; 07. Electrical control module. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0023] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0024] This invention provides a diaphragm stroke control system, including a first solenoid valve 02, a second solenoid valve 03, an oil replenishing device 04, an oil discharging device 05, and a diaphragm position detection device 06. The oil replenishing device 04 includes a one-way valve 041 and a first valve structure 042 connected to each other. The oil discharging device 05 includes a second valve structure 051. The diaphragm position detection device 06 determines an oil replenishing signal and an oil discharging signal based on the position information of the diaphragm in the diaphragm pump 01. The first solenoid valve 02 controls the first valve structure 042 to switch to the open state based on the oil replenishing signal, and the second solenoid valve 03 controls the second valve structure 051 to switch to the open state based on the oil discharging signal.

[0025] For example, both the first valve structure 042 and the second valve structure 051 can adopt the following oil replenishment / discharge valve structure, which includes: a valve body 1, the valve body 1 having a first oil port 11, a second oil port 121, a hydraulic control port 13, and a first sliding cavity 14; a valve core 2, the valve core 2 having a driving part 21 and a sealing part 22, the driving part 21 being slidably disposed in the first sliding cavity 14 to switch to an open state or a closed state, in the open state the first oil port 11 and the second oil port 121 being connected, in the closed state the sealing part 22 sealingly isolating the first oil port 11 and the second oil port 121; an elastic element 3, the elastic element 3 being disposed in the first sliding cavity 14 and located on one side of the driving part 21, for driving the driving part 21 to slide to the closed state, the hydraulic control port 13 being disposed on the side of the driving part 21 opposite to the elastic element 3, the liquid in the hydraulic control port 13 being used to drive the driving part 21 to slide to the open state.

[0026] Combination Figure 1 As shown in the figure, the Z-axis is used to illustrate the movement direction of the corresponding structure in the oil replenishment and drainage valve structure, and is not used as a limitation on the movement direction of the corresponding structure. The following is an exemplary description of the structural relationship of the oil replenishment and drainage valve structure in the open and closed states: When the oil replenishment and drainage valve structure is in the closed state, the first oil port 11 and the second oil port 121 are sealed and separated by the sealing part 22. The drive part 21 is provided with an elastic element 3 on the positive side of the Z-axis, and the drive part 21 is corresponding to the hydraulic control port 13 on the negative side of the Z-axis. At this time, the liquid in the hydraulic control port 13 does not have enough pressure to overcome the elastic force of the elastic element 3.

[0027] When the oil replenishment / discharge valve structure switches from the closed state to the open state, the liquid pressure in the hydraulic control port 13 increases to the point that it can overcome the elastic force of the elastic element 3, thereby driving the drive unit 21 to move in the positive direction of the Z-axis in the figure. The sealing part 22 moves in the positive direction of the Z-axis along with the valve core 2 as a whole, thereby connecting the first oil port 11 and the second oil port 121. At this time, the oil replenishment / discharge valve structure is in the open state. When the oil replenishment / discharge valve structure is used in the diaphragm stroke control system of the diaphragm pump 01, the oil replenishment / discharge valve structure in the open state can realize the function of replenishing or discharging oil.

[0028] Combination Figure 1 and Figure 2 As shown, diaphragm pump 01 Figure 2 The diagram shows a connection to the diaphragm stroke control system. When the diaphragm position detection device 06 detects that the diaphragm exceeds the allowable deformation range, the electronic control module 07 will send an oil replenishment signal and / or an oil discharge signal (when the diaphragm is operating normally, no signal is sent, or a signal to shut off oil replenishment or oil discharge is sent; additionally, for some existing diaphragm position detection devices 06, the electronic control module 07 may not be required, and the oil replenishment and oil discharge signals can be controlled directly through the diaphragm position detection device 06). The first solenoid valve 02 controls the switching of the first valve structure 042 according to the oil replenishment signal. When the second solenoid valve 03 controls the second valve structure 051 to switch to the open or closed state according to the oil discharge signal, it should be noted that the specific time for the first valve structure 042 and the second valve structure 051 to maintain the open or closed state should be designed according to the specific deformation of the diaphragm. It can be understood that the open state can correspond to the opening degree of multiple valve structures (for example, the sealing part 22 in the above-mentioned oil discharge valve structure can form different opening degrees of the second oil port 121 at multiple positions). In this way, it can be ensured that the diaphragm works within the allowable range.

[0029] It is understood that those skilled in the art may also choose other oil replenishment and drainage valve structures as the first valve structure 042 and / or the second valve structure 051 as needed. The specific structure of the valve can be adapted to the sealing requirements, assembly requirements, etc., and is not limited here.

[0030] The diaphragm stroke control system of the present invention can determine whether the diaphragm position of the diaphragm pump 01 is within the allowable range based on the diaphragm position detection device 06. When the diaphragm position exceeds the allowable range, it issues an oil replenishment signal and / or an oil discharge signal. The first solenoid valve 02 controls the first valve structure 042 to switch to the open state based on the oil replenishment signal, thereby replenishing oil to the diaphragm pump 01. The second solenoid valve 03 controls the second valve structure 051 to switch to the open state based on the oil discharge signal, thereby discharging oil from the diaphragm pump 01. This system controls the stroke of the diaphragm pump 01, ensuring that the diaphragm deforms within the allowable range. Furthermore, compared to the gas... The hydraulic replenishment and discharge valve scheme of this invention adopts a hydraulic control form for the first valve structure 042 and the second valve structure 051, eliminating the need to add a pneumatic structure to the original hydraulic system. The overall structure is simpler and saves equipment space. Moreover, compared with the normally open replenishment and discharge valve in the traditional technology, the first valve structure 042 and the second valve structure 051 of this invention are normally closed structures. In the absence of external force, the first valve structure 042 and the second valve structure 051 can remain in the closed state in the event of power failure, oil supply failure, etc., avoiding the hydraulic equipment from going out of control and causing greater failures, reducing the failure rate and improving the overall reliability of the equipment.

[0031] Preferably, the present invention employs the aforementioned oil replenishment / drainage valve structure, which allows the liquid in the hydraulic control port 13 to drive the driving part 21 of the valve core 2 to slide, thereby overcoming the elastic force of the elastic element 3. The sealing part 22 moves together with the valve core 2, thereby connecting the first oil port 11 and the second oil port 121, thus switching the oil replenishment / drainage valve structure to the open state. Alternatively, the liquid pressure in the hydraulic control port 13 may be insufficient to overcome the elastic force of the elastic element 3, and the elastic force of the elastic element 3 acts on the driving part 21, causing the sealing part 22 to maintain a sealing and isolation effect between the first oil port 11 and the second oil port 121, thus switching the oil replenishment / drainage valve structure to the closed state. The oil replenishment / drainage valve structure achieves control of the connection between the first oil port 11 and the second oil port 121 through the hydraulic control port 13, and can be used as the oil replenishment / drainage actuator of the diaphragm pump 01. (i.e., the first valve structure 042 and / or the second valve structure 051) realizes the control of the oil replenishment and oil discharge functions. At the same time, compared with the pneumatic solution in the traditional technology, the oil replenishment and discharge valve structure adopts the hydraulic control form, which does not require the addition of a pneumatic structure to the original hydraulic system. The overall structure is simpler and saves equipment space. Moreover, compared with the normally open oil replenishment and discharge valve in the traditional technology, the oil replenishment and discharge valve structure of the present invention is a normally closed structure. When no external force is applied, the drive part 21 of the oil replenishment and discharge valve structure is affected by the elastic force of the elastic element 3 and always maintains the sealing and isolation of the first oil port 11 and the second oil port 121. In the event of power failure, oil supply failure, etc., the oil replenishment and discharge valve structure can still remain in the closed state, avoiding the hydraulic equipment from going out of control and causing greater failures, reducing the failure rate and improving the overall equipment reliability.

[0032] Furthermore, a valve cover 15 is connected to the valve body 1, and the elastic element 3 is connected between the valve cover 15 and the drive part 21.

[0033] Combination Figure 1 As shown, the valve cover 15 is installed on the positive Z-axis side of the valve body 1, covering the opening of the positive Z-axis end of the first sliding cavity 14. The positive Z-axis end of the elastic element 3 is connected to the valve cover 15, and the negative Z-axis end of the elastic element 3 is connected to the drive unit 21. The valve cover 15 facilitates the installation of the elastic element 3 into the first sliding cavity 14 and provides a support point for the elastic element 3, which is beneficial for the elastic element 3 to drive the valve core 2 to slide along the Z-axis.

[0034] Furthermore, the elastic element 3 is a disc spring 31, and a connecting post 211 is connected to the driving part 21, with the disc spring 31 sleeved on the connecting post 211.

[0035] Combination Figure 1 As shown, the elastic element 3 is a disc spring 31, and a connecting post 211 is integrally connected to the drive part 21. The disc spring 31 is sleeved on the connecting post 211, and the connecting post 211 plays a guiding role in the deformation of the disc spring 31. The disc spring 31 has the characteristics of high stiffness and high load bearing capacity, and is suitable for scenarios with high liquid pressure.

[0036] Furthermore, the valve cover 15 is provided with a limiting groove 151 communicating with the first sliding cavity 14, and the end of the connecting post 211 is used to abut against the inner wall of the limiting groove 151.

[0037] Combination Figure 1 As shown, a limiting groove 151 is provided on the valve cover 15. The connecting column 211 can move in the limiting groove 151 as the valve core 2 slides. The inner wall of the limiting groove 151 located at the positive end of the Z-axis can abut against the end of the connecting column 211 to limit the sliding range of the valve core 2, thereby ensuring that the disc spring 31 can stretch and deform within the normal range.

[0038] Furthermore, the valve cover 15 is provided with a connecting hole 152, the limiting groove 151 is connected to the inner cavity of the disc spring 31, one end of the connecting hole 152 is connected to the limiting groove 151, and the other end of the connecting hole 152 is connected to the first sliding cavity 14 outside the disc spring 31. The valve body 1 is provided with a vent hole 16, and the vent hole 16 is connected to the first sliding cavity 14 outside the disc spring 31.

[0039] Combination Figure 1As shown, the connecting hole 152 on the valve cover 15 connects the first sliding cavity 14 outside the disc spring 31 and the limiting groove 151. The valve body 1 is provided with a vent hole 16, which is connected to the first sliding cavity 14. The limiting groove 151 is also connected to the inner cavity of the disc spring 31, thereby connecting the inner and outer spaces of the disc spring 31 with the vent hole 16. The vent hole 16 can be connected to the atmosphere, thereby allowing gas to pass through during the extension and contraction deformation of the disc spring 31, ensuring that the extension and contraction deformation of the disc spring 31 in the first sliding cavity 14 can proceed normally, and thus ensuring the normal sliding action of the valve core 2.

[0040] Furthermore, a valve seat 12 is connected to the valve body 1, and the second oil port 121 is opened on the valve seat 12. In the closed state, the sealing part 22 seals the second oil port 121.

[0041] Combination Figure 1 As shown, the valve seat 12 is installed on the opposite side of the Z-axis of the valve body 1. The second oil port 121 is opened on the valve seat 12. The valve core 2 slides along the Z-axis. When switching from the open state to the closed state, the valve core 2 slides in the opposite direction of the Z-axis, and the end of the valve core 2 contacts the valve seat 12 around the second oil port 121 to achieve a sealing effect. In addition, by setting the valve seat 12 at different positions along the Z-axis, the elastic force of the elastic element 3 in the closed state can be adjusted, thereby ensuring the sealing performance.

[0042] Furthermore, the valve seat 12 is provided with a convex spherical surface 122, the second oil port 121 is opened at the convex spherical surface 122, and the sealing part 22 is provided with a sealing gasket to make sealing contact with the convex spherical surface 122.

[0043] Combination Figure 1 As shown, a convex spherical surface 122 is provided on the positive Z-axis side of the valve seat 12. A second oil port 121 is opened on the convex spherical surface 122. The second oil port 121 passes through the valve seat 12 to connect with other hydraulic pipelines outside the oil replenishment and drainage valve structure. A corresponding sealing gasket (not shown in the figure, it can be a soft gasket made of common non-metallic sealing materials, etc., and the specific structure and materials can be designed according to needs) can be provided on the sealing part 22.

[0044] Thus, by using the design of the convex spherical surface 122 and the sealing gasket for sealing contact, the sealing effect of the sealing part 22 on the second oil port 121 can be improved.

[0045] Furthermore, the elastic element 3 is disposed between the valve cover 15 and the drive part 21 with a preset compression amount.

[0046] Combination Figure 1As shown, the elastic element 3 is a disc spring 31. The preset compression amount of the disc spring 31 refers to the amount of deformation of the elastic element 3 after the oil replenishment valve structure is assembled (in the closed state) compared to the elastic element 3 in the state without external force. Its specific value can be designed according to needs. For example, in order to ensure sealing and to ensure that no leakage occurs at the sealing part 22 in the closed state, the elastic force of the elastic element 3 under the preset compression amount is designed to be 1000N. Then, its preset compression amount is calculated according to the relevant parameters of the elastic element 3.

[0047] In this way, the pre-tightening force of the sealing part 22 of the valve core 2 can be increased by the preset compression amount of the elastic element 3, thereby improving the sealing effect.

[0048] Furthermore, the valve body 1 is provided with a hydraulic control chamber 17 and a connecting chamber 18. The hydraulic control chamber 17 is connected to the hydraulic control port 13. The hydraulic control chamber 17 is provided on the side of the drive part 21 away from the elastic member 3. The first oil port 11 and the second oil port 121 are connected through the connecting chamber 18. The valve body 1 forms a second sliding chamber 19 between the hydraulic control chamber 17 and the connecting chamber 18. The sealing part 22 is slidably disposed in the second sliding chamber 19.

[0049] Combination Figure 1 As shown, the shape of the hydraulic control chamber 17 is similar to that of the drive part 21 of the valve core 2, or the cross-sectional area of ​​the hydraulic control chamber 17 is larger than that of the drive part 21. In this way, the liquid entering the hydraulic control chamber 17 through the hydraulic control port 13 can more easily act on the drive part 21, thereby pushing the drive part 21 to connect the first oil port 11 and the second oil port 121. The connecting cavity 18 is designed to correspond to the shape of the valve seat 12 so that the valve seat 12 can be installed on one side of the connecting cavity 18. In the closed state, the sealing part 22 abuts against the valve seat 12 to seal the second oil port 12. 1. The connecting cavity 18 is located between the first oil port 11 and the second oil port 121, which provides a certain buffer for the liquid and reduces the impact force of the liquid on the oil replenishment and discharge valve structure. A second sliding cavity 19 is opened on the valve body 1 between the hydraulic control cavity 17 and the connecting cavity 18 so that the sealing part 22 can pass through the second sliding cavity 19 from the side of the hydraulic control cavity 17 into the connecting cavity 18 during assembly. At the same time, some sealing elements can be provided on the valve core 2 between the sealing part 22 and the drive part 21 to prevent the liquid in the hydraulic control cavity 17 from flowing with the liquid in the connecting cavity 18.

[0050] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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 the scope of protection of this invention; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0051] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A diaphragm stroke control system, characterized in that, The system includes a first solenoid valve, a second solenoid valve, an oil replenishing device, an oil discharging device, and a diaphragm position detection device. The oil replenishing device includes a one-way valve and a first valve structure connected to each other. The oil discharging device includes a second valve structure. The diaphragm position detection device determines the oil replenishing signal and the oil discharging signal based on the position information of the diaphragm in the diaphragm pump. The first solenoid valve controls the first valve structure to switch to the open state based on the oil replenishing signal. The second solenoid valve controls the second valve structure to switch to the open state based on the oil discharging signal. Both the first valve structure and the second valve structure adopt a replenishment / drainage valve structure, which includes: The valve body is provided with a first oil port, a second oil port, a hydraulic control port, and a first sliding chamber; A valve core is provided with a driving part and a sealing part. The driving part is slidably disposed in the first sliding cavity to switch to an open state or a closed state. In the open state, the first oil port is connected to the second oil port. In the closed state, the sealing part seals and isolates the first oil port and the second oil port. An elastic element is disposed in the first sliding cavity and located on one side of the driving part, for driving the driving part to slide to the closed state. The liquid control port is disposed on the side of the driving part away from the elastic element, and the liquid in the liquid control port is used to drive the driving part to slide to the open state.

2. The diaphragm stroke control system according to claim 1, characterized in that, A valve cover is connected to the valve body, and the elastic element is connected between the valve cover and the drive unit.

3. The diaphragm stroke control system according to claim 2, characterized in that, The elastic element is a disc spring, and a connecting post is connected to the driving part, with the disc spring sleeved on the connecting post.

4. The diaphragm stroke control system according to claim 3, characterized in that, The valve cover is provided with a limiting groove that communicates with the first sliding cavity, and the end of the connecting column is used to abut against the inner wall of the limiting groove.

5. The diaphragm stroke control system according to claim 4, characterized in that, The valve cover is provided with a connecting hole, the limiting groove is connected to the inner cavity of the disc spring, one end of the connecting hole is connected to the limiting groove, and the other end of the connecting hole is connected to the first sliding cavity outside the disc spring. The valve body is provided with a vent hole, and the vent hole is connected to the first sliding cavity outside the disc spring.

6. The diaphragm stroke control system according to claim 1, characterized in that, A valve seat is connected to the valve body, and the second oil port is opened on the valve seat. In the closed state, the sealing part seals the second oil port.

7. The diaphragm stroke control system according to claim 6, characterized in that, The valve seat is provided with a convex spherical surface, the second oil port is opened at the convex spherical surface, and the sealing part is provided with a sealing gasket to seal and contact the convex spherical surface.

8. The diaphragm stroke control system according to claim 2, characterized in that, The elastic element is positioned between the valve cover and the drive unit with a preset compression amount.

9. The diaphragm stroke control system according to claim 1, characterized in that, The valve body is provided with a hydraulic control chamber and a connecting chamber. The hydraulic control chamber is connected to the hydraulic control port. The hydraulic control chamber is provided on the side of the drive unit away from the elastic element. The first oil port and the second oil port are connected through the connecting chamber. The valve body forms a second sliding chamber between the hydraulic control chamber and the connecting chamber. The sealing part is slidably disposed in the second sliding chamber.

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