Diaphragm type pneumatic control pressure regulating device and electric proportional valve

Abstract

The utility model discloses a diaphragm type air control pressure regulating device which comprises a valve body, a valve cover and a diaphragm assembly, the valve cover is fixedly connected to the valve body, the valve body is provided with an air inlet, a working port and an air outlet, the diaphragm assembly is pressed between the valve body and the valve cover, a diaphragm upper cavity is formed between the valve cover and the diaphragm assembly, and a diaphragm lower cavity is formed between the valve cover and the diaphragm assembly. A valve port seat is arranged between the valve body and the diaphragm assembly, a valve port is formed in the valve port seat, the valve rod is movably arranged in the valve port, the valve body, the valve cover and the valve port seat are all plastic parts, the lower end of the valve rod is sleeved with an elastic part, and an exhaust channel is formed in the valve rod. The electric control module is fixedly connected with the valve cover, the electric control module comprises a pressurizing electromagnetic valve correspondingly matched with the upper diaphragm cavity, a pressure reducing electromagnetic valve and a pressure sensor correspondingly matched with the working port, only the valve port seat needs to be replaced when the valve port is damaged, the valve body, the valve cover and the valve port seat are integrally formed through injection molding, the production efficiency is high, and the precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a diaphragm type pneumatic pressure regulating device and an electro-hydraulic proportional valve. Background Art

[0002] An electro-hydraulic proportional valve is a control element that can convert an electrical signal into mechanical displacement, causing the valve core to move a certain distance relative to the valve body, thereby changing the opening degree of the valve, and further adjusting the flow rate of the fluid medium. For example, a compact precision electro-hydraulic proportional valve disclosed in a Chinese patent application (publication number: CN221278526U) includes: a valve body housing, an electronic control module, a diaphragm assembly, a valve stem, and a liquid crystal display screen. The electronic control module, the diaphragm assembly, and the valve stem are arranged inside the valve body housing, and the liquid crystal display screen is arranged on the valve body housing. The electronic control module includes a diaphragm pressurizing solenoid valve, a diaphragm depressurizing solenoid valve, and a pressure sensor. A cross-shaped raised air nozzle is arranged directly above the valve stem on the valve body housing. A cross-shaped raised air nozzle is arranged directly above the valve stem in the middle of the lower housing. When the exhaust diaphragm gasket tightly presses the valve stem, the diaphragm assembly continues to move downward against the elastic force of the rubber elastic gasket, and the valve stem disengages from the cross-shaped raised air nozzle, realizing the passage from the pressure input port, the cross-shaped raised air nozzle to the pressure output port. The gas path design of the valve body is simpler, making the processing of the valve body more convenient.

[0003] However, the valve body housing of the above electro-hydraulic proportional valve is made of aluminum die-casting, with relatively low finished product precision and requiring further precision machining, resulting in high costs. To ensure the stability and safety of gas flow, corresponding connectors generally need to be installed at the air inlet and outlet of the electro-hydraulic proportional valve. During the process of tightening the connectors, due to the processing characteristics of aluminum material, some aluminum chips may be generated. If these aluminum chips are not properly treated, they may be sucked into the valve, causing blockage or damage to the valve port. The valve port of the above electro-hydraulic proportional valve is integrally formed in the valve body. When the valve port is damaged, the entire valve body needs to be replaced, resulting in high costs. If the aluminum chips are further sucked into the diaphragm pressurizing solenoid valve or the diaphragm depressurizing solenoid valve, it may cause damage to these solenoid valves, not only reducing their working efficiency but also possibly causing system failures. Therefore, it is necessary to make improvements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a diaphragm type pneumatic pressure regulating device and an electro-hydraulic proportional valve for the defects and deficiencies of the prior art, with a simple and reasonable structure, convenient operation. The split valve port design is convenient for processing. When the valve port is damaged, only the valve port seat needs to be replaced instead of the entire valve body, reducing costs. The valve body, valve cover, and valve port seat are integrally injection-molded with plastic, with high production efficiency and high precision. In the connection method of installing the air inlet connector and the air outlet connector, an insertion type is adopted instead of a screwing type, thus avoiding the problem of easy generation of debris in the screwing type connector and improving the service life of the product.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A diaphragm type pneumatic control pressure regulating device of the utility model includes a valve body, a valve cover and a diaphragm assembly. The valve cover is fixedly connected to the valve body. A valve rod is movably arranged in the valve body. An air inlet, a working port and an exhaust port are respectively arranged on the valve body. The outer periphery of the diaphragm assembly is pressed between the valve body and the valve cover. A diaphragm upper cavity is formed between the valve cover and the diaphragm assembly. A valve port seat is arranged between the valve body and the diaphragm assembly. The valve port seat is fixedly connected to the valve body. A valve port is arranged on the valve port seat. The air inlet is communicated with the working port through the valve port. The valve rod is movably inserted into the valve port. The valve body, the valve cover and the valve port seat are all plastic parts. A sealing part is arranged on the valve rod. An elastic part is sleeved at the lower end of the valve rod. The elastic part makes the sealing part have a movement tendency to seal the valve port. The inside of the valve rod is hollow and provided with an exhaust channel corresponding to and cooperating with the diaphragm assembly. The working port is communicated with the exhaust port through the exhaust channel.

[0007] Further, the diaphragm assembly includes a diaphragm upper cover, a diaphragm body, a diaphragm lower cover and a diaphragm gasket. The diaphragm upper cover is fixedly connected to the diaphragm lower cover. The middle part of the diaphragm body is pressed between the diaphragm upper cover and the diaphragm lower cover. The outer periphery of the diaphragm body is pressed between the valve body and the valve cover. A diaphragm gasket is arranged on the diaphragm lower cover. The diaphragm body makes the diaphragm gasket have a movement tendency to seal the exhaust channel.

[0008] Further, a silencer is arranged in the exhaust port.

[0009] Further, a cap which is in limit fit with the silencer is arranged in the exhaust port. A gap is formed between the cap and the exhaust port.

[0010] Further, the elastic part is an elastic gasket.

[0011] Further, the middle part of the valve rod extends outwards to form the sealing part. A sealing sleeve is sleeved outside the sealing part.

[0012] Further, a plurality of convex blocks are arranged on the valve port seat along the circumferential direction of the valve port. A diversion groove is formed between two adjacent convex blocks.

[0013] Further, a filter is arranged in the air inlet.

[0014] Based on the above diaphragm type pneumatic control pressure regulating device, an electro-hydraulic proportional valve is also provided, which includes the diaphragm type pneumatic control pressure regulating device described above, and also includes an electronic control module. The electronic control module is fixedly connected to the valve cover. The electronic control module includes a pressurizing solenoid valve, a decompressing solenoid valve and a pressure sensor. The pressurizing solenoid valve and the decompressing solenoid valve respectively correspond to and cooperate with the diaphragm upper cavity and are respectively used for regulating the air pressure in the diaphragm upper cavity. The pressure sensor corresponds to and cooperates with the working port.

[0015] Furthermore, the electronic control module further includes a circuit board, and the pressure increasing solenoid valve, the pressure reducing solenoid valve, and the pressure sensor are electrically connected to the circuit board respectively.

[0016] The beneficial effects of the present utility model are as follows: For a diaphragm type pneumatic control pressure regulating device described in the present utility model, the valve port is arranged on the valve port seat, and the split design is convenient for processing. When the valve port is damaged, only the valve port seat needs to be replaced instead of the whole valve body, which reduces the cost. The valve body, the valve cover, and the valve port seat are all plastic parts and are integrally injection molded by plastic, with high production efficiency and high precision. In the connection method of installing the air inlet joint and the air outlet joint, the insertion type is adopted instead of the screwing type, thereby avoiding the problem that the screwing type joint is prone to generating debris and improving the service life of the product.

[0017] An electro-pneumatic proportional valve described in the present utility model includes a diaphragm type pneumatic control pressure regulating device. The pressure sensor detects the air pressure at the working port in real time. When the air pressure at the working port is lower than the set value, the electronic control module controls the pressure increasing solenoid valve to work. The air source enters the upper chamber of the diaphragm through the vent hole to pressurize the upper chamber of the diaphragm, controlling the diaphragm assembly to move downward, so that the diaphragm gasket seals the exhaust passage. When the pressure in the upper chamber of the diaphragm is greater than the resultant force of the pressure in the lower chamber of the diaphragm and the elastic force of the elastic gasket, the valve stem moves downward, causing the sealing part to disengage from the valve port, and the gas at the air inlet enters the working port through the valve port, and the air pressure at the working port starts to rise. When the air pressure at the working port is higher than the set value, the electronic control module controls the pressure reducing solenoid valve to work, and the gas in the upper chamber of the diaphragm is discharged from the exhaust hole through the vent hole and the second air passage. When the pressure in the upper chamber of the diaphragm is less than the resultant force of the pressure in the lower chamber of the diaphragm and the elastic force of the elastic gasket, the valve stem moves upward, and the sealing part seals the valve port, and the air pressure at the working port starts to drop, ensuring that the air pressure at the working port is maintained within a reasonable range. Description of the Drawings

[0018] Figure 1 is a schematic cross-sectional structure view of the diaphragm type pneumatic control pressure regulating device from the first perspective;

[0019] Figure 2 is a schematic cross-sectional structure view of the diaphragm type pneumatic control pressure regulating device from the second perspective;

[0020] Figure 3 is a schematic structure view of the valve port seat;

[0021] Figure 4 is a schematic cross-sectional structure view of the electro-pneumatic proportional valve;

[0022] Figure 5 is a schematic structure view of the electro-pneumatic proportional valve.

[0023] Figures 1 - 5Chinese: 1. Valve body; 2. Valve cover; 21. Vent hole; 22. Exhaust hole; 3. Diaphragm assembly; 31. Diaphragm upper cover; 32. Diaphragm body; 33. Diaphragm lower cover; 34. Diaphragm gasket; 35. Diaphragm upper cavity; 4. Valve stem; 41. Elastic member; 42. Sealing portion; 43. Sealing sleeve; 44. Exhaust passage; 5. Inlet port; 51. Filter; 6. Working port; 7. Exhaust port; 71. Muffler; 72. Cap; 8. Valve port seat; 81. Projection; 82. Flow guide groove; 83. Valve port; 9. Electric control module; 91. Pressure increasing solenoid valve; 92. Pressure reducing solenoid valve; 93. Housing. Detailed implementation manner

[0024] The following further describes the present utility model with reference to the accompanying drawings.

[0025] Such as Figures 1 - 3A diaphragm type pneumatically controlled pressure regulating device as shown includes a valve body 1, a valve cover 2 and a diaphragm assembly 3. The valve cover 2 is fixedly connected to the valve body 1. Specifically, the valve cover 2 and the valve body 1 are fixedly connected by screws, and the connection relationship is stable. A valve rod 4 is movably arranged in the valve body 1. An air inlet 5, a working port 6 and an exhaust port 7 are respectively arranged on the valve body 1. An air inlet joint is connected to the air inlet 5, and an air outlet joint is connected to the working port 6. The air inlet joint is connected to a gas source, and the air outlet joint is connected to a gas-using device. The outer periphery of the diaphragm assembly 3 is pressed between the valve body 1 and the valve cover 2 and is not easily detached. A diaphragm upper chamber 35 is formed between the valve cover 2 and the upper end surface of the diaphragm assembly 3, and a diaphragm lower chamber is formed between the valve body 1 and the lower end surface of the diaphragm assembly 3. A valve port seat 8 is arranged between the valve body 1 and the diaphragm assembly 3. The valve port seat 8 is fixedly connected to the valve body 1. Specifically, the valve port seat 8 and the valve body 1 are fixedly connected by bolts. A valve port 83 is arranged on the valve port seat 8. The air inlet 5 is communicated with the working port 6 through the valve port 83. The valve rod 4 is movably inserted into the valve port 83. The valve port 83 is arranged on the valve port seat 8, and the split design is convenient for processing. When the valve port 83 is damaged, only the valve port seat 8 needs to be replaced instead of the whole valve body 1, reducing costs. The valve body 1, the valve cover 2 and the valve port seat 8 are all plastic parts and are integrally injection molded by plastic, with high production efficiency and high precision. In the connection method of installing the air inlet joint and the air outlet joint, the insertion type is adopted instead of the screwing type, thus avoiding the problem that the screwing type joint is prone to generate debris and improving the service life of the product. A sealing portion 42 is arranged on the valve rod 4. Preferably, in this embodiment, the middle part of the valve rod 4 extends outward to form the sealing portion 42. A sealing sleeve 43 is sleeved outside the sealing portion 42. An elastic member 41 is sleeved at the lower end of the valve rod 4. Preferably, in this embodiment, the elastic member 41 is an elastic sealing gasket, which plays a sealing role to prevent air leakage. The elastic sealing gasket provides an upward elastic force to make the sealing portion 42 have a movement tendency to seal the valve port 83. The inside of the valve rod 4 is hollow and is provided with an exhaust passage 44 corresponding to and cooperating with the diaphragm assembly. The exhaust port 7 is arranged below the exhaust passage 44. When the exhaust passage 44 is opened, the working port 6 is communicated with the exhaust port 7 through the exhaust passage 44 to achieve exhaust.

[0026] Preferably, in this embodiment, the diaphragm assembly 3 includes a diaphragm upper cover 31, a diaphragm body 32, a diaphragm lower cover 33, and a diaphragm gasket 34. The diaphragm upper cover 31 is fixedly connected to the diaphragm lower cover 33. Specifically, the diaphragm upper cover 31 and the diaphragm lower cover 33 are fixedly connected by bolts, and the connection relationship is firm. The middle part of the diaphragm body 32 is pressed between the diaphragm upper cover 31 and the diaphragm lower cover 33, and the outer periphery of the diaphragm body 32 is pressed between the valve body 1 and the valve cover 2. An installation groove matching with the diaphragm body 32 is provided on the valve body 1. Two circular protrusions are integrally provided on the lower surface of the diaphragm body 32. The diaphragm body 32 is bent downward to have a corrugated structure. A diaphragm gasket 34 is provided on the diaphragm lower cover 33. The diaphragm body 32 makes the diaphragm gasket 34 have a tendency to seal the exhaust passage 44.

[0027] In the initial state, there is no pressure in the diaphragm upper chamber 35. The valve stem 4 moves upward under the elastic force of the elastic gasket, so that the sealing portion 42 seals the valve port 83. When the pressure at the air inlet 5 increases, the air pressure presses tightly around the elastic gasket, playing an auxiliary supporting role, making the elastic force of the elastic gasket stronger. Furthermore, the pressure for the sealing portion 42 to seal the valve port 83 is greater. The diaphragm assembly 3 seals the exhaust passage 44 under its own elastic force. When there is residual gas at the working port 6, since there is no pressure in the diaphragm upper chamber 35, the air pressure at the working port 6 acts on the lower surface of the diaphragm assembly 3 to push the diaphragm assembly 3 upward, so that the diaphragm gasket 34 no longer seals the exhaust passage 44, and the exhaust passage 44 is opened. The working port 6 exhausts gas to the exhaust port 7 through the exhaust passage 44. In the working state, the air source enters the diaphragm upper chamber 35, and the diaphragm assembly 3 moves downward under the action of air pressure, so that the diaphragm gasket 34 seals the exhaust passage 44. When the pressure in the diaphragm upper chamber 35 is greater than the resultant force of the pressure in the diaphragm lower chamber and the elastic force of the elastic gasket, the valve stem 4 moves downward, so that the sealing portion 42 disengages from the valve port 83, and the gas at the air inlet 5 enters the working port 6 through the valve port 83.

[0028] Preferably, in this embodiment, a silencer 71 is provided in the exhaust port 7 to reduce the noise generated during exhaust.

[0029] Preferably, in this embodiment, a cap 72 that is in limit fit with the silencer 71 is provided in the exhaust port 7 to prevent the silencer 71 from being displaced undesirably and affecting the use. A gap is formed between the cap 72 and the exhaust port 7, and the gas is discharged from the gap.

[0030] Preferably, in this embodiment, refer to Figure 3 , a plurality of protrusions 81 are provided on the valve port seat 8 along the circumferential direction of the valve port 83. The protrusions 81 play a guiding role for the valve stem 4, and a flow guiding groove 82 is formed between adjacent two protrusions 81 to facilitate gas flow.

[0031] Preferably, in this embodiment, a filter 51 is provided in the air inlet 5 for filtering dust and impurities to prevent dust and impurities from entering the valve body 1 and affecting the service life of the product.

[0032] Based on the above diaphragm type pneumatic pressure regulating device, there is also provided a Figures 4 - 5 shown electro-hydraulic proportional valve, which includes the above diaphragm type pneumatic pressure regulating device, and also includes an electronic control module 9. The electronic control module 9 is fixedly connected to the valve cover 2. The electronic control module 9 includes a housing 93, a pressure increasing solenoid valve 91, a pressure reducing solenoid valve 92, and a pressure sensor. Specifically, the housing 93 is fixedly connected to the valve cover 2 by screws, and the connection relationship is firm. An accommodation space is formed between the housing 93 and the valve cover 2. The pressure increasing solenoid valve 91, the pressure reducing solenoid valve 92, and the pressure sensor are arranged in the accommodation space. The valve cover 2 is provided with a ventilation hole 21 communicating with the upper diaphragm chamber 35. The pressure increasing solenoid valve 91 and the pressure reducing solenoid valve 92 are correspondingly matched with the upper diaphragm chamber 35 through the ventilation hole 21 and are respectively used to adjust the air pressure in the upper diaphragm chamber 35. The pressure sensor is correspondingly matched with the working port 6 for detecting the air pressure at the working port 6.

[0033] Preferably, in this embodiment, the electronic control module 9 further includes a circuit board, and the pressure increasing solenoid valve 91, the pressure reducing solenoid valve 92, and the pressure sensor are respectively electrically connected to the circuit board.

[0034] Specifically, a first air passage communicating the air inlet 5 and the pressure increasing solenoid valve 91 is provided on the valve body 1 and the valve cover 2. The gas in the air inlet 5 enters the pressure increasing solenoid valve 91 through the first air passage. An exhaust hole 22 is formed between the valve body 1 and the valve cover 2. The valve cover 2 is provided with a second air passage communicating the exhaust hole 22 and the pressure reducing solenoid valve 92. The gas in the pressure reducing solenoid valve 92 is discharged from the exhaust hole 22 through the second air passage.

[0035] The pressure sensor detects the air pressure at the working port 6 in real time. When the air pressure at the working port 6 is lower than the set value, the electronic control module 9 controls the pressurizing solenoid valve 91 to work. The air source enters the upper chamber 35 of the diaphragm through the vent hole 21 to pressurize the upper chamber 35 of the diaphragm, controlling the diaphragm assembly 3 to move downward, so that the diaphragm gasket 34 seals the exhaust passage 44. When the pressure in the upper chamber 35 of the diaphragm is greater than the resultant force of the pressure in the lower chamber of the diaphragm and the elastic force of the elastic gasket, the valve stem 4 moves downward, so that the sealing part 42 disengages from the valve port 83, and the gas at the air inlet 5 enters the working port 6 through the valve port 83, and the air pressure at the working port 6 begins to rise. When the air pressure at the working port 6 is higher than the set value, the electronic control module 9 controls the decompression solenoid valve 92 to work, and the gas in the upper chamber 35 of the diaphragm is discharged from the exhaust hole 22 through the vent hole 21 and the second air passage. When the pressure in the upper chamber 35 of the diaphragm is less than the resultant force of the pressure in the lower chamber of the diaphragm and the elastic force of the elastic gasket, the valve stem 4 moves upward, and the sealing part 42 seals the valve port 83, and the air pressure at the working port 6 begins to drop, ensuring that the air pressure at the working port 6 remains within a reasonable range.

[0036] For the structure and working principle of the electronic control module 9, reference can be made to a compact precision electric proportional valve disclosed in a Chinese patent application (publication number: CN221278526U). Since the structure and working principle of the electronic control module 9 have been detailedly disclosed in the prior art, they will not be elaborated here.

[0037] The above is only the preferred embodiment of the present invention. Therefore, any equivalent changes or modifications made according to the structure, features and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. A diaphragm type pneumatically controlled pressure regulating device, comprising a valve body (1), a valve cover (2) and a diaphragm assembly (3). The valve cover (2) is fixedly connected to the valve body (1). A valve rod (4) is movably arranged in the valve body (1). An air inlet (5), a working port (6) and an exhaust port (7) are respectively arranged on the valve body (1). The outer periphery of the diaphragm assembly (3) is pressed between the valve body (1) and the valve cover (2). A diaphragm upper cavity (35) is formed between the valve cover (2) and the diaphragm assembly (3). It is characterized in that: A valve port seat (8) is provided between the valve body (1) and the diaphragm assembly (3). The valve port seat (8) is fixedly connected to the valve body (1). A valve port (83) is provided on the valve port seat (8). The air inlet (5) is communicated with the working port (6) through the valve port (83). The valve stem (4) is movably inserted into the valve port (83). The valve body (1), the valve cover (2) and the valve port seat (8) are all plastic parts. A sealing portion (42) is provided on the valve stem (4). An elastic member (41) is sleeved on the lower end of the valve stem (4). The elastic member (41) makes the sealing portion (42) have a movement tendency to seal the valve port (83). The interior of the valve stem (4) is hollow and provided with an exhaust passage (44) corresponding to and cooperating with the diaphragm assembly. The working port (6) is communicated with the exhaust port (7) through the exhaust passage (44).

2. The diaphragm type pneumatic pressure regulating device according to claim 1, wherein: The diaphragm assembly (3) includes a diaphragm upper cover (31), a diaphragm body (32), a diaphragm lower cover (33) and a diaphragm gasket (34). The diaphragm upper cover (31) is fixedly connected to the diaphragm lower cover (33). The middle part of the diaphragm body (32) is pressed between the diaphragm upper cover (31) and the diaphragm lower cover (33). The outer periphery of the diaphragm body (32) is pressed between the valve body (1) and the valve cover (2). A diaphragm gasket (34) is provided on the diaphragm lower cover (33). The diaphragm body (32) makes the diaphragm gasket (34) have a movement tendency to seal the exhaust passage (44).

3. The diaphragm type pneumatic pressure regulating device according to claim 1, characterized in that: A silencer (71) is provided in the exhaust port (7).

4. The diaphragm type pneumatic control pressure regulating device according to claim 3, wherein: A cap (72) which is in limit cooperation with the silencer (71) is provided in the exhaust port (7). A gap is formed between the cap (72) and the exhaust port (7).

5. A diaphragm-type pneumatic pressure regulating device according to claim 1, characterized in that: The elastic member (41) is an elastic sealing gasket.

6. The diaphragm type pneumatic pressure regulating device according to claim 1, characterized in that: The middle part of the valve stem (4) extends outward to form the sealing portion (42). A sealing sleeve (43) is sleeved outside the sealing portion (42).

7. The diaphragm type pneumatic control pressure regulating device according to claim 1, wherein: A plurality of convex blocks (81) are provided on the valve port seat (8) along the circumferential direction of the valve port (83). A diversion groove (82) is formed between two adjacent convex blocks (81).

8. The diaphragm type pneumatic pressure regulating device according to claim 1, characterized in that: A filter (51) is provided in the air inlet (5).

9. An electro-hydraulic proportional valve, characterized in that: Including the diaphragm type pneumatic pressure regulating device according to any one of claims 1-8, further comprising an electronic control module (9). The electronic control module (9) is fixedly connected to the valve cover (2). The electronic control module (9) includes a pressurizing solenoid valve (91), a decompressing solenoid valve (92) and a pressure sensor. The pressurizing solenoid valve (91) and the decompressing solenoid valve (92) respectively correspond to and cooperate with the upper diaphragm chamber (35) and are respectively used for regulating the air pressure in the upper diaphragm chamber (35). The pressure sensor corresponds to and cooperates with the working port (6).

10. An electro-hydraulic proportional valve according to claim 9, characterized in that: The electronic control module (9) further includes a circuit board. The pressurizing solenoid valve (91), the decompressing solenoid valve (92) and the pressure sensor are respectively electrically connected to the circuit board.

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