Pressure reducing valve

Abstract

The utility model relates to the technical field of valves, and provides a pressure reducing valve which is not prone to water leakage and long in service life, and comprises a valve body and a lifting rod arranged in the valve body in a sliding mode, the bottom end of the lifting rod is provided with an opening and closing block which is attached to the inner wall of the valve body and can seal the valve body, and the bottom of the opening and closing block is provided with a reset spring fixedly connected with the inner wall of the valve body. A downward pressing spring fixedly connected with the middle section of the lifting rod is further arranged in an inner cavity of the valve body, a buffering pipeline penetrating through the valve body is arranged on the inner cavity, located at the water inlet end, of the valve body, and the buffering pipeline comprises a water pressing pipe arranged in the inner cavity, located at the water inlet end, of the valve body and penetrating through the valve body and a resistance piece arranged on the inner wall of the water pressing pipe in a sliding mode. An opening and closing plate is further movably clamped to the tail end of the water pressing pipe, water flow impact generated at the moment when the opening and closing block closes the valve body enters the water pressing pipe and pushes the resistance piece, and the water flow impact force is counteracted through sliding resistance of the resistance piece.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, and particularly relates to a pressure reducing valve. Background Art

[0002] A pressure reducing valve is a kind of throttling element. Through adjustment, it reduces the inlet pressure to a required outlet pressure, and relies on the energy of the medium itself to automatically keep the outlet pressure stable. A pressure spring with adjustable tightness is provided on the valve, and the spring is connected to the opening and closing member. At the same time, a return spring is also provided at the lower end of the opening and closing member. In the static state, the pressures of the two springs cancel each other out, making the opening and closing member in a closed state. When draining water at the water outlet end, the pressure at the water outlet end decreases, and then the pressure in the inner cavity of the water outlet end decreases. As a result, the pressure at the inlet end is greater than the pressure at the water outlet end, and then the opening and closing member is extruded and pressed down to open, allowing water to flow into the water outlet end, keeping the pressure at the water outlet end within a certain range and lower than the pressure at the inlet end. After the water outlet end stops discharging water, the water pressure in the water outlet end gradually increases, and gradually cooperates with the return spring through the increased water pressure in the water outlet end to re-close the opening and closing member. Thus, even when there is no water discharge, the water pressure at the water outlet end is also kept within a certain range, making the water pressure of the water outlet pipe lower and making the water flow more controllable.

[0003] Although the above-mentioned prior art can solve corresponding technical problems, there are still certain defects: If the drainage pipe of the existing pressure reducing valve drains water frequently, it will cause the opening and closing member to open and close frequently. At the moment of closing, the inner cavity of the inlet end of the pressure reducing valve will be impacted by the sudden interruption of the water flow, and long-term use is likely to cause the inlet end to be quickly worn due to the water flow impact, affecting the sealing effect and service life of the pressure reducing valve. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a pressure reducing valve that is not easy to leak water and has a long service life in view of the defects and deficiencies of the prior art.

[0005] To achieve the above purpose, the utility model adopts the following technical scheme: A pressure reducing valve includes a valve body and a lifting rod slidably arranged in the valve body. An opening and closing block that fits with the inner wall of the valve body and can close the valve body is provided at the bottom end of the lifting rod. A return spring fixedly connected to the inner wall of the valve body is provided at the bottom of the opening and closing block. A downward pressure spring fixedly connected to the middle section of the lifting rod is also provided in the inner cavity of the valve body. A buffer pipe penetrating the valve body is provided in the inner cavity of the valve body at the inlet end. The buffer pipe includes a pressure water pipe provided in the inner cavity of the valve body at the inlet end and penetrating the valve body and a resistance piece slidably arranged on the inner wall of the pressure water pipe. An opening and closing plate is also movably clamped at the end of the pressure water pipe. When the opening and closing block closes the valve body, the generated water flow impact enters the pressure water pipe and pushes the resistance piece, and the sliding resistance of the resistance piece offsets the water flow impact force.

[0006] Further improvement: A reinforcing block is provided at the connection position between the pressure pipe and the inner cavity of the valve body.

[0007] Further improvement: A reset elastic piece is provided between the side wall of the opening and closing plate and the inner wall of the pressure pipe.

[0008] Further improvement: A silica gel gasket is provided at the opening and closing part of the opening and closing plate.

[0009] Further improvement: A limiting convex block for restricting excessive movement of the resistance piece is further provided on the inner wall of the pressure pipe.

[0010] Further improvement: A pressure support pillar is further provided between the limiting convex block and the resistance piece.

[0011] Further improvement: The resistance piece includes a water pressure piece slidably disposed on the inner wall of the pressure pipe and a converging block disposed on the side of the water pressure piece close to the valve body.

[0012] Further improvement: A water pressure groove is further provided on the side of the water pressure piece close to the valve body.

[0013] Further improvement: A clamping groove is further provided on the surface of the water pressure piece in contact with the pressure pipe, and a resistance wheel with an outer wall fittingly contacting the inner wall of the pressure pipe is provided in the clamping groove.

[0014] Further improvement: The resistance wheel includes a core disposed in the clamping groove and a fixing frame disposed on the outer wall of the core. A rolling ring fittingly contacting the inner wall of the pressure pipe is slidably provided at the top of the fixing frame. A friction piece is provided between the inner wall of the rolling ring and the top of the fixing frame, and a plurality of friction grooves are further provided on the outer wall of the rolling ring.

[0015] After adopting the above technical solution, the beneficial effects of the present utility model are as follows: At the moment when the valve of the present utility model is closed, water flow can enter the buffer pipe, and then the water flow is concentrated and enters the pressure pipe, pushing the resistance piece to move. The resistance wheel of the resistance piece and the resistance generated by the sliding of the resistance piece are used to fully offset the impact force of the water flow, so that the impact force of the water flow at the moment when the valve is closed is absorbed and dispersed. Thus, it is avoided that the inner cavity of the pressure reducing valve is rapidly worn by the impact of the water flow under the condition of repeated opening and closing, the sealing performance is ensured, and the service life is prolonged. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0017] Figure 1 It is a schematic structural diagram of the front view cross-section of the pressure reducing valve of the present utility model;

[0018] Figure 2 It is a schematic structural diagram of the front view cross-section of the buffer pipeline of the present utility model;

[0019] Figure 3 It is a schematic structural diagram of the front view cross-section of the resistance piece of the present utility model;

[0020] Figure 4 It is a schematic structural diagram of the front view cross-section of the resistance wheel of the present utility model. Specific embodiments

[0021] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0022] Refer to Figures 1-4As shown in the figure, the technical solution adopted in this specific embodiment is as follows: A pressure reducing valve includes a valve body 1 and a lifting rod 3 slidably disposed within the valve body 1. A closing block 4 is provided at the bottom end of the lifting rod 3, which is in mutual fit with the inner wall of the valve body 1 and can close the valve body 1. A return spring 5 fixedly connected to the inner wall of the valve body 1 is provided at the bottom of the closing block 4. A downward pressure spring 2 fixedly connected to the middle section of the lifting rod 3 is further provided within the inner cavity of the valve body 1. A buffer pipe 7 penetrating the valve body 1 is provided on the inner cavity of the valve body 1 at the water inlet end. The buffer pipe 7 includes a pressure water pipe 21 disposed within the inner cavity of the valve body 1 at the water inlet end and penetrating the valve body 1, and a resistance piece 25 slidably disposed within the inner wall of the pressure water pipe 21. The resistance piece 25 includes a water pressure piece 31 slidably disposed within the inner wall of the pressure water pipe 21 and a converging block 32 provided on the side of the water pressure piece 31 close to the valve body 1. An opening and closing plate 22 is also movably engaged at the end of the pressure water pipe 21. When the closing block 4 closes the valve body 1 instantaneously, the generated water flow impact enters the pressure water pipe 21 and pushes the resistance piece 25. The water flow impact force is offset by the sliding resistance of the resistance piece 25. During use, the water inlet pipe is connected to the water inlet port of the valve body 1, and the water outlet pipe is connected to the water outlet port of the valve body 1. Water flow is input into the valve body 1 through the water inlet port, and the water outlet pipe is closed. At this time, the water pressure at the water inlet port can be used to squeeze the closing block 4 downward, thereby causing the elastic force balance between the return spring 5 and the downward pressure spring 2 to disappear. When the water flow pressure reaches a certain level, the closing block 4 is further pushed downward to generate a gap with the valve body 1, allowing water flow to enter the water outlet port of the valve body 1. As the water flow enters, the pressure at the water outlet port increases, while the pressure at the water inlet port decreases. When the pressure at the water outlet port reaches a certain level, it can cooperate with the return spring 5 to re-close the closing block 4, thereby closing the valve body 1. Thus, a certain pressure range is maintained at the water outlet port of the valve body 1. When the closing block 4 re-closes the valve body 1, at this time, the valve body 1 is quickly closed, causing the water flow to be suddenly cut off and impact the inner wall of the valve body 1. At this time, the water flow impact can fully enter the buffer pipe 7, and then the quickly impacting water flow enters the pressure water pipe 21 and pushes the resistance piece 25 within the pressure water pipe 21, causing the resistance piece 25 to be pushed along the pressure water pipe 21. At the same time, frictional resistance is generated with the inner wall of the pressure water pipe 21, and the opening and closing plate 22 is pushed open to discharge air, cooperating to convert part of the water flow impact into the thrust of air flow. The water pressure piece 31 of the resistance piece 25 generates friction with the pressure water pipe 21, gradually offsetting the water flow impact through friction, and cooperating with the converging block 32 to better concentrate the water flow on the water pressure piece 31. Thus, the water flow impact force can be absorbed and converted after the valve body 1 is closed, thereby avoiding rapid wear of the inner cavity of the pressure reducing valve caused by repeated opening and closing, ensuring the sealing performance, and extending the service life;

[0023] A reinforcing block 27 is provided at the connection position between the pressure water pipe 21 and the inner cavity of the valve body 1, which is beneficial to enhancing the strength of the connection part, thereby avoiding cracking or disconnection phenomena caused by excessive impact;

[0024] A reset elastic sheet 24 is provided between the side wall of the opening and closing plate 22 and the inner wall of the pressure water pipe 21, which is beneficial to pull back the opening and closing plate 22 through the reset elastic sheet 24 after the impact ends, so that it can be restored and ready to open again during the next impact;

[0025] A silica gel gasket 23 is provided at the opening and closing part of the opening and closing plate 22, which is beneficial to enhance the fitting degree and ensure the sealing effect when the opening and closing plate 22 is closed;

[0026] A limit convex block for restricting the excessive movement of the resistance piece 25 is further provided on the inner wall of the pressure water pipe 21, which is beneficial to prevent the resistance piece 25 from moving excessively and coming out of the pressure water pipe 21;

[0027] A pressure support column 26 is further provided between the limit convex block and the resistance piece 25, which is beneficial to further convert the water flow impact force conducted by the resistance piece 25 into the elastic force of the pressure support column 26;

[0028] A water pressure groove 33 is further provided on the side of the water pressure piece 31 close to the valve body 1, which is beneficial to increase the absorption and conduction effect of the water pressure;

[0029] A clamping groove 34 is further provided on the surface of the water pressure piece 31 that fits on the pressure water pipe 21. A resistance wheel 35 with an outer wall that fits and contacts the inner wall of the pressure water pipe 21 is provided in the clamping groove 34. The resistance wheel 35 includes an inner core 341 provided in the clamping groove 34 and a fixing frame 345 provided on the outer wall of the inner core 341. A rolling ring 342 that fits with the inner wall of the pressure water pipe 21 is slidably provided at the top of the fixing frame 345. A friction sheet 344 is provided between the inner wall of the rolling ring 342 and the top of the fixing frame 345. A plurality of friction grooves 343 are further provided on the outer wall of the rolling ring 342. When the water pressure piece 31 moves, the resistance wheel 35 is synchronously driven to move, so that the rolling ring 342 that fits on the inner wall of the pressure water pipe 21 rotates under the action of the friction grooves 343, and strong friction is generated through the friction sheet 344 that fits with its inner wall, thereby further absorbing a large amount of water flow impact force through friction and further dispersing and absorbing the impact force.

[0030] Working principle of the utility model: When the utility model is in use, the water inlet pipe is connected to the water inlet port of the valve body 1, and the water outlet pipe is connected to the water outlet port of the valve body 1. Water flow is input into the valve body 1 through the water inlet port, and the water outlet pipe is closed. At this time, the opening and closing block 4 can be squeezed downward by the water pressure at the water inlet port, thereby causing the elastic force balance between the return spring 5 and the downward pressure spring 2 to disappear. When the water flow pressure reaches a certain level, the opening and closing block 4 is pushed downward to generate a gap between it and the valve body 1, allowing water flow to enter the water outlet port of the valve body 1. As the water flow enters, the pressure at the water outlet port increases, while the pressure at the water inlet port decreases. When the pressure at the water outlet port reaches a certain level, it can cooperate with the return spring 5 to re-close the opening and closing block 4, thereby closing the valve body 1. Thus, a certain pressure range is maintained at the water outlet port of the valve body 1. When the opening and closing block 4 re-closes the valve body 1, at this time, the valve body 1 is quickly closed, causing the water flow to be suddenly cut off and impact the inner wall of the valve body 1. At this time, the water flow impact can fully enter the buffer pipe 7, and then the rapidly impacting water flow enters the pressure pipe 21, and pushes the resistance piece 25 in the pressure pipe 21, causing the resistance piece 25 to be pushed along the pressure pipe 21. At the same time, frictional resistance is generated with the inner wall of the pressure pipe 21, and the opening and closing plate 22 is pushed open to discharge air. By converting part of the water flow impact into the thrust of air flow, the water pressure piece 31 of the resistance piece 25 generates friction with the pressure pipe 21, gradually offsetting the water flow impact through friction, and cooperating with the converging block 32 to better concentrate the water flow on the water pressure piece 31. Thus, the water flow impact force can be absorbed and converted after the valve body 1 is closed, avoiding rapid wear of the inner cavity of the pressure reducing valve caused by repeated opening and closing due to water flow impact, ensuring the sealing performance, and extending the service life.

[0031] What the utility model aims to protect is the structure of the product. The models of each component are not the content protected by the utility model and are also well-known technologies. Any components on the market that can achieve the above functions of the utility model can be selected for application. Therefore, parameters such as the models of the components are not described in detail in the utility model. The contribution of the utility model lies in the scientific combination of each component.

Claims

1. A pressure reducing valve, comprising a valve body (1) and a lifting rod (3) slidably disposed within the valve body (1). An opening and closing block (4) is provided at the bottom end of the lifting rod (3), which is in mutual fit with the inner wall of the valve body (1) and can close the valve body (1). A return spring (5) fixedly connected to the inner wall of the valve body (1) is provided at the bottom of the opening and closing block (4). A downward pressure spring (2) fixedly connected to the middle section of the lifting rod (3) is further provided within the inner cavity of the valve body (1), characterized in that: A buffer pipe (7) penetrating the valve body (1) is provided in the inner cavity of the valve body (1) at the water inlet end. The buffer pipe (7) includes a pressure water pipe (21) provided in the inner cavity of the valve body (1) at the water inlet end and penetrating the valve body (1), and a resistance piece (25) slidably arranged on the inner wall of the pressure water pipe (21). An opening and closing plate (22) is also movably clamped at the end of the pressure water pipe (21). When the opening and closing block (4) closes the valve body (1) instantaneously, the generated water flow impact enters the pressure water pipe (21) and pushes the resistance piece (25), and the water flow impact force is offset by the sliding resistance of the resistance piece (25).

2. The pressure reducing valve according to claim 1, wherein: A reinforcing block (27) is provided at the connection position between the pressure water pipe (21) and the inner cavity of the valve body (1).

3. A pressure reducing valve according to claim 1, characterized in that: A reset elastic piece (24) is provided between the side wall of the opening and closing plate (22) and the inner wall of the pressure water pipe (21).

4. A pressure reducing valve according to claim 1, characterized in that: A silica gel gasket (23) is provided at the opening and closing part of the opening and closing plate (22).

5. A pressure reducing valve according to claim 1, characterized in that: A limiting convex block for restricting excessive movement of the resistance piece (25) is also provided on the inner wall of the pressure water pipe (21).

6. The pressure reducing valve according to claim 5, wherein: A pressure support column (26) is also provided between the limiting convex block and the resistance piece (25).

7. A pressure reducing valve according to claim 1, characterized in that: The resistance piece (25) includes a water pressure piece (31) slidably arranged on the inner wall of the pressure water pipe (21) and a converging block (32) arranged on the side of the water pressure piece (31) close to the valve body (1).

8. A pressure reducing valve according to claim 7, characterized in that: A water pressure groove (33) is also provided on the side of the water pressure piece (31) close to the valve body (1).

9. The pressure reducing valve according to claim 7, characterized in that: A clamping groove (34) is provided on the surface of the water pressure piece (31) in contact with the pressure water pipe (21), and a resistance wheel (35) with an outer wall in mutual contact with the inner wall of the pressure water pipe (21) is arranged in the clamping groove (34).

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