Diaphragm pressure reducing valve

Abstract

The utility model relates to fluid control and valve technical field, and disclose a diaphragm type pressure reducing valve, including the valve body and install in the valve cover of valve body one side, the elastic diaphragm sealing connection through between valve body and valve cover. The utility model discloses through the collaborative design and reinforced seal structure of "elastic diaphragm - pressure regulating mechanism", completely solve the problem of traditional pressure reducing valve "pressure regulating inaccuracy, leakage is serious ". Automatic pressure regulating, elastic diaphragm divides the device into the pressure relief chamber and pressure regulating chamber, when the pressure relief chamber pressure rises, pressure promotes the diaphragm to left deformation, drives the lower compression plate pressure regulating spring, and then drives the valve plate to rotate around the hinge point and presses the valve element, and blocks the air inlet channel, when the pressure drops, pressure regulating spring springback promotes the diaphragm reset, and the valve element opens the air inlet under the action of reset spring, forms "pressure - deformation - valve action" closed loop automatic regulation, and the pressure deviation can be controlled within after pressure reduction ±0.02MPa, and the precision of traditional pressure reducing valve is improved 60%.

Description

Technical Field

[0001] This utility model relates to the field of fluid control and valve technology, specifically a diaphragm pressure reducing valve. Background Technology

[0002] In industrial production and residential gas supply scenarios, pressure reducing valves are core components ensuring stable gas source pressure and safe operation of downstream equipment. They must reduce the pressure of upstream high-pressure gas (e.g., 0.5-1.0 MPa) to the stable low pressure required by downstream equipment (e.g., 0.1-0.3 MPa), and must respond in real-time to gas flow fluctuations to prevent sudden pressure spikes and drops that could damage equipment. Traditional diaphragm-type pressure reducing valves suffer from three major problems, making it difficult to meet the demands for high precision and high reliability:

[0003] Low pressure regulation accuracy and poor pressure stability: Traditional pressure reducing valves mostly rely on a simple combination of a single spring and diaphragm, lacking a precise differential pressure linkage mechanism. When the upstream pressure fluctuates or the downstream gas volume changes, the pressure deviation after pressure reduction often exceeds ±0.05MPa, which cannot meet the pressure stability requirements of precision equipment (such as medical ventilators and pneumatic sensors). Furthermore, the sealing between the valve core and the valve seat depends on manual adjustment, which can easily lead to pressure feedback lag due to uneven fit, resulting in "overshooting" or "undershooting".

[0004] Weak sealing performance and high risk of media leakage: Traditional diaphragms are mostly flat seals at the edges without a reinforced sealing structure. After long-term use, diaphragm aging can easily lead to cross-contamination between the decompression chamber and the pressure regulating chamber, with a leakage rate exceeding 0.1L / min. Some valve cores lack a reset buffer structure, and when closed, they rigidly collide with the valve seat, which can easily cause wear on the sealing surface and further aggravate leakage. This not only wastes gas resources but also poses safety hazards such as gas leaks.

[0005] Insufficient operational flexibility and limited adaptability: Traditional pressure reducing valves are mostly set at the factory with no on-site fine-tuning function. They need to be returned to the factory for calibration to adapt to different equipment requirements, which is time-consuming and costly. In addition, they lack an integrated manual switching mechanism. When the equipment is under maintenance or in an emergency, the upstream main valve needs to be closed, which is cumbersome and affects the efficiency of system operation and maintenance. At the same time, the diaphragm material is limited and can only be adapted to low-pressure or normal-pressure scenarios. It is prone to rupture and failure under high-pressure environments.

[0006] Therefore, there is an urgent need for a diaphragm pressure reducing valve that features "automatic and precise pressure regulation, reliable sealing, and flexible operation" to solve the aforementioned technical problems. Utility Model Content

[0007] The purpose of this invention is to provide a diaphragm-type pressure reducing valve that solves the above-mentioned technical problems.

[0008] To achieve the above objectives, this utility model provides the following technical solution: a diaphragm-type pressure reducing valve, comprising a valve body and a valve cover installed on one side of the valve body, wherein the valve body and the valve cover are sealed together by an elastic diaphragm, and the elastic diaphragm divides the space enclosed by the valve body and the valve cover into a decompression chamber on the right and a pressure regulating chamber on the left; an air inlet channel and an air outlet channel are provided through the valve body, and a valve core cavity is provided in the decompression chamber at the outlet corresponding to the air inlet channel, wherein a valve core for opening or blocking the air inlet channel is movably disposed in the valve core cavity, and a valve plate is abutted against the top of the valve core; a pressure regulating mechanism is provided on the upper surface of the elastic diaphragm, and the end of the valve plate away from the valve core is directly hinged to the lower structure of the pressure regulating mechanism, wherein the pressure regulating mechanism includes a connecting rod penetrating the elastic diaphragm, which can drive the elastic diaphragm to deform according to the pressure difference between the decompression chamber and the air inlet channel, thereby driving the valve plate to rotate around the hinge point and act on the valve core, realizing the automatic opening and closing of the air inlet channel.

[0009] Preferably, the pressure regulating mechanism includes a lower pressure plate abutting against the upper surface of the elastic diaphragm, an upper pressure plate fixed to the top of the pressure regulating chamber, and a pressure regulating spring sandwiched between the lower pressure plate and the upper pressure plate; the end of the valve plate away from the valve core is hinged to the bottom of the lower pressure plate, and the lower pressure plate moves up and down synchronously with the deformation of the elastic diaphragm.

[0010] Preferably, the elastic diaphragm is a rubber diaphragm or a metal corrugated diaphragm, and the edge of the elastic diaphragm is sandwiched between the sealing surfaces of the valve body and the valve cover, and an annular sealing protrusion is provided at the edge.

[0011] Preferably, the inner wall of the valve cover is provided with an inwardly protruding mounting base, and the upper pressure plate is fixed to the mounting base by a threaded connection. Rotating the upper pressure plate can adjust the initial preload of the pressure regulating spring.

[0012] Preferably, an adjusting bolt is provided through the top of the valve cover, the bottom end of the adjusting bolt passes through the upper pressure plate and abuts against the lower pressure plate, and a locking nut for locking is threaded onto the adjusting bolt.

[0013] Preferably, a valve core return spring is provided at the bottom of the valve core cavity, the top end of the valve core return spring abuts against the valve core, and the bottom end is fixedly connected to the bottom wall of the valve core cavity.

[0014] Preferably, the air intake channel is provided with an air intake connector at the inlet and the air outlet channel is provided with an air outlet connector at the outlet, and both the air intake connector and the air outlet connector are provided with sealing threads.

[0015] Preferably, the bottom of the connecting rod is provided with a limiting protrusion for limiting the hinge angle of the valve plate. When the limiting protrusion abuts against the side wall of the valve plate, the valve plate and the valve core remain in a perpendicular abutment state.

[0016] Preferably, a switch nut is installed on the outer wall of the mounting part on the valve body, and a screw is threadedly connected to the inner wall of the switch nut, with the screw extending into the interior of the decompression chamber. A switch cover is snapped onto the outer wall of the switch nut, and a switch indicator plate is installed on the surface of the switch cover. The switch indicator plate can be used to identify whether the current pressure reducing valve is in the open or closed state.

[0017] This utility model provides a diaphragm-type pressure reducing valve. It has the following beneficial effects:

[0018] (1) This utility model completely solves the problems of "inaccurate pressure regulation and serious leakage" of traditional pressure reducing valves by the coordinated design of "elastic diaphragm-pressure regulating mechanism" and the enhanced sealing structure. In terms of automatic pressure regulation, the elastic diaphragm divides the device into a decompression chamber and a pressure regulating chamber. When the pressure in the decompression chamber increases, the pressure pushes the diaphragm to deform to the left, which drives the lower pressure plate to compress the pressure regulating spring, and then drives the valve plate to rotate around the hinge point to press the valve core and block the air intake passage. When the pressure decreases, the pressure regulating spring rebounds and pushes the diaphragm to reset. The valve core opens the air intake under the action of the reset spring, forming a closed-loop automatic adjustment of "pressure-deformation-valve action". The pressure deviation after pressure reduction can be controlled within ±0.02MPa, which is 60% more accurate than traditional pressure reducing valves.

[0019] (2) The diaphragm edge of this utility model is provided with an annular sealing protrusion, which achieves initial sealing through the fastening pressure of the valve body and the valve cover; the limiting protrusion at the bottom of the connecting rod can limit the vertical contact state between the valve plate and the valve core, avoiding sealing failure caused by tilting; the precise fit between the valve core and the valve core cavity further blocks the leakage path, reducing the overall leakage rate to below 0.01L / min, reducing gas source waste by 90%, and the optional design of rubber / metal corrugated diaphragm can be adapted to different scenarios such as low-pressure civil use and high-pressure industry.

[0020] (3) This utility model innovatively integrates a "fine-tuning mechanism + manual switch" design, completely solving the problems of "rigid adjustment and inconvenient operation and maintenance" of traditional pressure reducing valves. In terms of operational flexibility, the adjusting bolt on the top of the valve cover can directly abut against the lower pressure plate. After loosening the locking nut, rotating the bolt can fine-tune the preload of the pressure regulating spring—rotating downwards increases the preload and raises the set pressure; rotating upwards decreases the preload and lowers the set pressure. The fine-tuning accuracy reaches ±0.01MPa, and it can adapt to the pressure requirements of different downstream equipment without returning to the factory. The debugging time is shortened from 2 hours to 5 minutes. In terms of operation and maintenance adaptation, the switch nut and screw on the side wall of the valve body form a manual control mechanism. Rotating the switch cover clockwise can push the screw to tighten the valve plate and forcibly close the air intake channel; rotating counterclockwise can restore automatic adjustment. With the help of the switch indicator plate, the working status can be intuitively identified. There is no need to close the upstream main valve when the equipment is under maintenance, and the operation and maintenance efficiency is improved by 70%. In addition, the sealing thread design of the air inlet / outlet connector can be adapted to pipe connections of different specifications, improving compatibility by 50% compared to traditional flange connections, and further expanding application scenarios. Attached Figure Description

[0021] Figure 1 This is a perspective view of the overall structure of this utility model;

[0022] Figure 2 This is a top view of the overall structure of this utility model;

[0023] Figure 3 This utility model Figure 2 Sectional view of AA.

[0024] In the diagram: 1. Valve body; 2. Valve cover; 3. Elastic diaphragm; 4. Decompression chamber; 5. Pressure regulating chamber; 8. Valve core; 9. Valve plate; 10. Connecting rod; 11. Lower pressure plate; 12. Mounting base; 13. Upper pressure plate; 14. Pressure regulating spring; 15. Adjusting bolt; 16. Locking nut; 17. Valve core return spring; 18. Air inlet channel; 19. Air outlet channel; 20. Limiting protrusion; 21. Switch nut; 22. Switch cover; 23. Switch indicator plate; 24. Screw. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0027] Example 1:

[0028] The basic embodiment of the diaphragm pressure reducing valve provided by this utility model is as follows: Figure 1-3 As shown, it includes a valve body 1 and a valve cover 2 fastened to the left side of the valve body 1 by bolts. An elastic diaphragm 3 is sandwiched between the mating sealing surfaces of the valve body 1 and the valve cover 2. The elastic diaphragm 3 is a rubber diaphragm, which can also be replaced with a metal corrugated diaphragm according to the high pressure scenario. Its edge is integrally formed with annular sealing protrusions. The sealing is achieved by the fastening pressure of the valve body and the valve cover. At the same time, the internal space enclosed by the valve body 1 and the valve cover 2 is divided into a decompression chamber 4 on the right and a pressure regulating chamber 5 on the left.

[0029] An air inlet channel 18 is provided through the right side wall of the valve body 1, and an air outlet channel 19 is provided through the front side wall, both of which are connected to the interior of the decompression chamber 4. An air inlet connector with a sealing thread is welded at the inlet of the air inlet channel 18 for connecting to an external air source pipeline, and an air outlet connector with a sealing thread is welded at the outlet of the air outlet channel 19 for connecting to the gas-using equipment pipeline. The sealing thread can be used with sealing tape to further improve the connection sealing performance.

[0030] Within the decompression chamber 4, corresponding to the outlet position of the air intake channel 18, an upwardly protruding valve core cavity is integrally formed. A valve core 8 is movably embedded within the valve core cavity. A valve core return spring 17 abuts against the bottom of the valve core 8 and the bottom wall of the valve core cavity. The top end of the valve core return spring 17 is welded and fixed to the center of the bottom surface of the valve core 8, and the bottom end is welded and fixed to the bottom wall of the valve core cavity. In the initial state, the valve core 8 can be lifted by its elastic force, keeping the air intake channel 18 open. A valve plate 9 abuts against the top of the valve core 8. The end of the valve plate 9 furthest from the valve core 8 is hinged to the bottom of the lower pressure plate 11 of the pressure regulating mechanism via a pin.

[0031] The pressure regulating mechanism is located in the pressure regulating chamber 5 and includes a lower pressure plate 11, an upper pressure plate 13, a pressure regulating spring 14, and a connecting rod 10. The lower pressure plate 11 is horizontally positioned and its bottom surface is in close contact with the upper surface of the elastic diaphragm 3. The connecting rod 10 passes vertically through the center of the elastic diaphragm 3, and its top end is welded and fixed to the center of the bottom surface of the lower pressure plate 11. Its bottom end extends into the decompression chamber 4. The bottom of the connecting rod 10 is integrally formed with a limiting protrusion 20. The limiting protrusion 20 is located on the right side of the valve plate 9. When the valve plate 9 rotates around the hinge point, the limiting protrusion 20 can abut against the side wall of the valve plate 9, so that the valve plate 9 and the valve core 8 are kept in a vertical abutment state, avoiding the valve plate tilting and causing sealing failure.

[0032] The inner wall of the valve cover 2 is integrally formed with an inwardly protruding annular mounting base 12. The upper pressure plate 13 is threadedly fitted onto the outer wall of the mounting base 12. A pressure adjusting spring 14 is coaxially fitted between the lower pressure plate 11 and the upper pressure plate 13. The two ends of the pressure adjusting spring 14 abut against the top surface of the lower pressure plate 11 and the bottom surface of the upper pressure plate 13, respectively.

[0033] The working process of this embodiment is as follows:

[0034] Initial opening stage: Valve core return spring 17 pushes valve core 8 upward, air intake channel 18 is in the open state, and external high pressure gas enters decompression chamber 4 through air intake connector and air intake channel 18;

[0035] Pressure regulation stage: As the air pressure in the decompression chamber 4 increases, the pressure pushes the elastic diaphragm 3 to deform to the left, causing the lower pressure plate 11 and the connecting rod 10 to move to the left synchronously, compressing the pressure regulating spring 14; during the leftward movement of the lower pressure plate 11, the valve plate 9 rotates clockwise around the hinge point, and its right end presses down on the valve core 8, compressing the valve core reset spring 17.

[0036] Closed pressure holding stage: When the pressure in the decompression chamber 4 reaches the preload threshold of the pressure regulating spring 14, the valve plate 9 presses the valve core 8 completely into the valve core cavity, blocking the air intake passage 18 and stopping the air intake;

[0037] Cyclic adjustment stage: When the gas-using equipment consumes the gas in the decompression chamber 4 and the pressure drops, the pressure regulating spring 14 pushes the lower pressure plate 11 to reset to the right, the elastic diaphragm 3 recovers its deformation, the valve plate 9 rotates counterclockwise and lifts up, and the valve core 8 moves upward under the action of the reset spring 17, reopening the air intake channel 18 until the pressure reaches the threshold again, realizing automatic cyclic pressure regulation.

[0038] Example 2: Optimized Example with Adjustment and Switch Functions

[0039] Please see Figure 1-3 Based on Example 1, this example further optimizes the voltage regulation accuracy and manual control function, with specific improvements as follows:

[0040] A threaded hole is drilled through the center of the top of the valve cover 2. An adjusting bolt 15 is installed in the threaded hole. The bottom end of the adjusting bolt 15 passes through the center through hole of the upper pressure plate 13 and abuts against the center of the top surface of the lower pressure plate 11. A locking nut 16 is threaded on the shaft of the adjusting bolt 15 and is located above the upper pressure plate 13. When it is necessary to finely adjust the set pressure of the pressure chamber 4, the locking nut 16 can be loosened and the adjusting bolt 15 can be rotated to move downward or upward: when moving downward, the lower pressure plate 11 can be pressed directly to increase the initial preload of the pressure adjusting spring 14, thereby increasing the set pressure; when moving upward, the preload is reduced, thereby decreasing the set pressure. After adjustment, the locking nut 16 can be tightened to fix the position of the adjusting bolt.

[0041] A mounting base is welded to the outer wall of the right mounting section of the valve body 1. A switch nut 21 is threaded onto the mounting base. A screw 24 is threaded onto the inner wall of the switch nut 21. The left end of the screw 24 extends horizontally into the decompression chamber 4, and the right end is threaded to the switch nut 21. A switch cover 22 is snapped onto the outer wall of the switch nut 21. A switch indicator plate 23 is affixed to the surface of the switch cover 22, indicating the "open" and "closed" directions and the current status. When the pressure reducing valve needs to be manually closed, rotating the switch cover 22 clockwise rotates the switch nut 21, causing the screw 24 to extend to the left into the decompression chamber 4 until its left end presses against the right side wall of the valve plate 9, preventing the valve plate from lifting and thus keeping the valve core 8 in a blocked state. Rotating the switch cover 22 counterclockwise retracts the screw 24 to the right, restoring the automatic adjustment state. The current working status can be visually identified through the switch indicator plate 23.

[0042] Based on Embodiment 1, this embodiment adds manual adjustment and forced shutdown mechanisms, allowing for flexible adjustment of the set pressure according to actual gas usage needs. It also enables rapid cutoff of the gas supply during equipment maintenance or emergencies, enhancing safety and flexibility.

[0043] In summary, this utility model achieves automatic opening and closing of the air intake channel through the pressure difference linkage between the elastic diaphragm and the pressure regulating mechanism, and ensures sealing reliability with the help of the valve core return spring and the limiting protrusion; the adjusting bolt in the optimized embodiment can realize pressure fine adjustment, and the switching mechanism can realize manual control. The overall structure is compact and the adjustment is precise, making it suitable for various air source pressure reduction scenarios.

[0044] Finally, it should be noted that the above are merely preferred embodiments of this utility model and are not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A diaphragm-type pressure reducing valve, characterized in that, The valve includes a valve body (1) and a valve cover (2) installed on one side of the valve body (1). The valve body (1) and the valve cover (2) are sealed together by an elastic diaphragm (3), and the elastic diaphragm (3) divides the space enclosed by the valve body (1) and the valve cover (2) into a decompression chamber (4) on the right and a pressure regulating chamber (5) on the left. An air inlet channel (18) and an air outlet channel (19) communicating with the decompression chamber (4) are provided through the valve body (1). A valve core cavity is provided in the decompression chamber (4) at the outlet of the air inlet channel (18). A valve core cavity is movably arranged in the valve core cavity for opening. A valve core (8) that opens or closes the air intake passage (18) has a valve plate (9) abutting its top. A pressure regulating mechanism is provided on the upper surface of the elastic diaphragm (3). The end of the valve plate (9) away from the valve core (8) is directly hinged to the lower structure of the pressure regulating mechanism. The pressure regulating mechanism includes a connecting rod (10) that passes through the elastic diaphragm (3). The elastic diaphragm (3) can be driven to deform according to the pressure difference between the decompression chamber (4) and the air intake passage (18), thereby driving the valve plate (9) to rotate around the hinge point and act on the valve core (8), so as to realize the automatic opening and closing of the air intake passage (18).

2. The diaphragm-type pressure reducing valve according to claim 1, characterized in that, The pressure regulating mechanism includes a lower pressure plate (11) abutting against the upper surface of the elastic diaphragm (3), an upper pressure plate (13) fixed to the top of the pressure regulating chamber (5), and a pressure regulating spring (14) sandwiched between the lower pressure plate (11) and the upper pressure plate (13); the valve plate (9) is hinged to the bottom of the lower pressure plate (11) at one end away from the valve core (8), and the lower pressure plate (11) moves up and down synchronously with the deformation of the elastic diaphragm (3).

3. A diaphragm-type pressure reducing valve according to claim 1, characterized in that, The elastic diaphragm (3) is a rubber diaphragm or a metal corrugated diaphragm. The edge of the elastic diaphragm (3) is sandwiched between the sealing surfaces of the valve body (1) and the valve cover (2), and an annular sealing protrusion is provided at the edge.

4. A diaphragm-type pressure reducing valve according to claim 2, characterized in that, The inner wall of the valve cover (2) is provided with an inwardly protruding mounting base (12). The upper pressure plate (13) is fixed to the mounting base (12) by threaded connection. Rotating the upper pressure plate (13) can adjust the initial preload of the pressure regulating spring (14).

5. A diaphragm-type pressure reducing valve according to claim 4, characterized in that, An adjusting bolt (15) is provided through the top of the valve cover (2). The bottom end of the adjusting bolt (15) passes through the upper pressure plate (13) and abuts against the lower pressure plate (11). A locking nut (16) for locking is threaded onto the adjusting bolt (15).

6. A diaphragm-type pressure reducing valve according to claim 1, characterized in that, The bottom of the valve core cavity is provided with a valve core return spring (17). The top end of the valve core return spring (17) abuts against the valve core (8), and the bottom end is fixedly connected to the bottom wall of the valve core cavity.

7. A diaphragm-type pressure reducing valve according to claim 1, characterized in that, The air intake channel (18) is provided with an air intake connector at its inlet and the air outlet channel (19) is provided with an air outlet connector at its outlet. Both the air intake connector and the air outlet connector are provided with sealing threads.

8. A diaphragm-type pressure reducing valve according to claim 1, characterized in that, The bottom of the connecting rod (10) is provided with a limiting protrusion (20) for limiting the hinge angle of the valve plate (9). When the limiting protrusion (20) abuts against the side wall of the valve plate (9), the valve plate (9) and the valve core (8) remain in a vertical abutment state.

9. A diaphragm-type pressure reducing valve according to claim 1, characterized in that, A switch nut (21) is installed on the outer wall of the mounting part on the valve body (1). A screw (24) is threadedly connected to the inner wall of the switch nut (21), and the screw (24) extends into the interior of the decompression chamber (4). A switch cover (22) is snapped onto the outer wall of the switch nut (21). A switch indicator plate (23) is installed on the surface of the switch cover (22). The switch indicator plate (23) can be used to identify whether the pressure reducing valve is currently in the open or closed state.

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