Overflow valve with pressure relief function

Abstract

According to the overflow valve with the pressure relief function, a limiting structure is arranged in an overflow pressure adjusting cavity, by limiting the moving distance of an overflow piston, when the pressure at the front end of a pipeline is too large, the pressure relief piston is pushed to move, and then a pressure relief valve is opened; according to the pressure relief valve, the overflow piston is arranged in the pressure relief channel, so that overlarge gas pressure passes through the pressure relief channel, the pressure relief valve port and the cavity between the pressure relief piston and the overflow piston and then is exhausted through the pressure relief exhaust port, the gas pressure at the front end of a pipeline is reduced, that is, overlarge pressure in the corresponding pipeline is reduced, and the problem of gas explosion of the pipeline is avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of overflow valves, and in particular to an overflow valve with a pressure relief function. Background Art

[0002] The overflow valve is required in the air path control system of the vehicle air source system. It has an open valve that can play a simple function of opening at a specified pressure and closing at a specified pressure. Specifically, when the gas inlet reaches a certain pressure, the valve opens, and the gas that reaches a certain pressure enters the valve port through the open valve and enters the back-end structure through the pipeline for control; when the gas pressure at the gas inlet drops to a certain pressure, the valve cooperates with the valve port to close the gas channel. This ensures that when the air pressure at the front end of the pipeline is insufficient, the valve will not open, thereby ensuring the control and use functions of the front end of the pipeline. For example, when a leak or exhaust occurs at the front end of the pipeline, the valve closes, thereby ensuring the minimum pressure value at the back end of the pipeline to ensure its basic control and use needs at the back end.

[0003] Although the existing overflow valve can play the above-mentioned effective role and function, the setting of only one open valve is difficult to ensure the pipeline explosion-proof problem caused by excessive pressure at the front end of the pipeline. Summary of the Invention

[0004] In order to solve the above technical problems, the present invention provides a relief valve with a pressure relief function, which includes an upper cover with a breathing port and a main valve body adapted to the upper cover, an overflow pressure regulating chamber is formed between the main valve body and the upper cover, an overflow piston sealing and sliding along the side wall of the overflow pressure regulating chamber and an overflow pressure regulating assembly adapted to the overflow piston are provided in the overflow pressure regulating chamber, an air inlet channel and an air outlet channel adapted to the overflow piston are formed in the main valve body, one end of the air outlet channel forms a relief valve port, and a lower end of the relief piston is provided with a The overflow valve also includes a pressure relief piston located between the overflow piston and the overflow pressure regulating assembly and sealingly sliding along the side wall of the overflow pressure regulating chamber. A pressure relief channel connected to the air outlet channel is formed by passing through the overflow valve and the overflow piston. One end of the pressure relief channel forms a pressure relief valve port. A pressure relief valve adapted to the pressure relief valve port is provided at the lower end of the pressure relief piston. A pressure relief exhaust port is formed on the side wall of the overflow pressure regulating chamber between the pressure relief piston and the overflow piston. The overflow pressure regulating chamber is also provided with a limiting structure for limiting the moving distance of the overflow piston. A limiting structure is provided in the overflow pressure regulating chamber. By limiting the moving distance of the overflow piston, when the pressure at the front end of the pipeline is too high, the pressure relief piston is pushed to move, thereby opening the pressure relief valve, so that the excessive gas pressure passes through the pressure relief channel, the pressure relief valve port and the cavity between the pressure relief piston and the overflow piston, and is then discharged through the pressure relief exhaust port, thereby reducing the gas pressure at the front end of the pipeline, that is, reducing the excessive pressure in the corresponding pipeline, and avoiding the problem of gas explosion in the pipeline.

[0005] Furthermore, the upper cover is a hollow structure with one end open, and the main valve body is formed with a hollow structure with one end open. The open end of the upper cover forms an external thread, and the open end of the main valve body forms an internal thread, and the external thread of the upper cover is screwed into the internal thread of the main valve body; the limiting structure is the end of the upper cover that is screwed into the open end of the internal thread of the main valve body; the overflow piston is located at the lower part of the open end of the upper cover and slides in a sealed manner in the overflow pressure regulating cavity; the pressure relief piston is located in the overflow pressure regulating cavity in the upper cover and slides in a sealed manner. By providing an internal and external thread structure, the screwed-in end of the upper cover is set as a limiting structure, which reduces the need for a separate setting of the limiting structure. Combined with the threaded-in thread installation, that is, a part of the structure of the upper cover forms the limiting structure, the overall structure is simplified, and the purpose of limiting can be achieved.

[0006] Furthermore, the pressure relief channel, the overflow piston and the pressure relief piston are coaxially arranged. By coaxially arranging, the three can cooperate with each other under the impact of air pressure, move more stably and reduce deviation.

[0007] Furthermore, the breathing port is located on the side wall of the overflow pressure regulating chamber above the pressure relief piston.

[0008] Furthermore, the overflow pressure regulating assembly includes an regulating spring located above the pressure relief piston and abutting against the pressure relief piston, a spring seat abutting against the other end of the regulating spring, and an regulating bolt for adjusting the spring seat through the top wall of the upper cover.

[0009] Furthermore, the regulating springs are provided in two inner and outer pairs. By providing a double spring structure, the high-pressure gas can be prevented from deviating when impacting the overflow piston, thereby causing the valve to leak, thereby improving the stability of use and thus increasing the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the specific embodiments of the present invention, the following is a brief introduction to the drawings required for use in the specific embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0011] Figure 1 Is a schematic structural diagram of the present invention with a relief valve pressure relief function;

[0012] The reference numerals in the figure are as follows: 1-breathing port; 2-upper cover; 4-main valve body; 5-overflow piston; 6-inlet channel; 7-outlet channel; 8-overflow valve port; 9-overflow valve; 10-pressure relief piston; 11-pressure relief channel; 12-pressure relief valve port; 13-pressure relief valve; 14-pressure relief exhaust port; 15-limiting structure; 16-adjusting spring; 17-spring seat; 18-adjusting bolt; 19-thread combination. DETAILED DESCRIPTION

[0013] The following is a clear and complete description of the present invention in conjunction with the accompanying drawings. It is obvious that the embodiments described are only some of the embodiments of the present invention, not all of them. The embodiments of the present invention and other embodiments obtained by ordinary technicians in this field without making creative efforts are all within the scope of protection of the present invention.

[0014] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0015] In the description of this invention, it should be noted that, unless otherwise specified or limited, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they may refer to fixed, removable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this invention.

[0016] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0017] Example 1

[0018] like Figure 1As shown, this embodiment discloses a pressure relief valve with a pressure relief function, which includes an upper cover 2 with a breathing port 1 and a main valve body 4 adapted thereto, an overflow pressure regulating chamber is formed between the main valve body 4 and the upper cover 2, and the overflow pressure regulating chamber is composed of the upper cover 2 and the lower valve body 4. Specifically, the upper cover 2 is a cavity structure with an opening at one end, and a cavity structure with an opening at one end is formed on the main valve body 4. The open end of the upper cover 2 forms an external thread, and the open end of the main valve body 4 forms an internal thread. The external thread of the upper cover 2 is screwed into the internal thread of the main valve body 4, and the two form a threaded combination 19 structure; an overflow piston 5 that seals and slides along the side wall of the overflow pressure regulating chamber and an overflow pressure regulating assembly adapted to the overflow piston 5 are provided in the overflow pressure regulating chamber, and the above-mentioned sealing sliding is achieved by arranging an O-ring around the overflow piston 5. At this time, the sealing is good, which can ensure the high sealing requirements of the pipeline equipment.An air inlet channel 6 and an air outlet channel 7 adapted to the overflow piston 5 are formed in the main valve body 4, and a port of the air outlet channel 7 forms an overflow valve port 8. At the same time, an overflow valve 9 adapted to the overflow valve port 8 is provided at the lower end of the overflow piston 5. Specifically, a valve groove is formed at the lower end of the overflow piston 5, and the overflow valve 9 formed of a flexible material, such as rubber, silicone, etc., is provided in the valve groove; and a sealing slide is also provided between the overflow piston 5 and the overflow pressure regulating assembly and along the side wall of the overflow pressure regulating chamber. The movable pressure relief piston 10, the above-mentioned sealing sliding is achieved by arranging a K-type sealing ring around the pressure relief piston, which has a low movement resistance to ensure that the pressure relief value is more accurate. Specifically, the overflow pressure regulating assembly includes an adjusting spring 16 located above the pressure relief piston 10 and abutting against the pressure relief piston 10, a spring seat 17 abutting against the other end of the adjusting spring 16, and an adjusting bolt 18 for adjusting the spring seat 17 through the side wall of the upper cover 2. At the same time, a pressure relief channel communicating with the outlet channel 7 is formed by penetrating the overflow valves 9 and the overflow piston 5. 11. Specifically, one end of the pressure relief channel 11 forms a pressure relief valve port 12, and the other end thereof is connected to the air outlet channel 7. The lower end of the pressure relief piston 10 is provided with a pressure relief valve 13 adapted to the pressure relief valve port 12. Specifically, the lower end of the pressure relief piston 10 forms a valve groove, and a pressure relief valve 13 formed of a flexible material is provided in the valve groove, such as rubber, silicone, etc.; a pressure relief exhaust port 14 is formed on the side wall of the overflow pressure regulating chamber between the pressure relief piston 10 and the overflow piston 5, and the number of the pressure relief exhaust port 14 is not specifically limited. , preferably arranged evenly in the annular direction. In the present embodiment, there are two symmetrically arranged ones; the overflow pressure regulating chamber is also provided with a limiting structure for limiting the moving distance of the overflow piston 5. The setting of the limiting structure is various. In the present embodiment, the limiting structure 15 is the end of the open end of the internal thread of the upper cover 2 that is screwed into the main valve body 4. At this time, the overflow piston 5 is located in the overflow pressure regulating chamber at the lower part of the open end of the upper cover 2 and seals and slides; the pressure relief piston 10 is located in the overflow pressure regulating chamber in the upper cover 2 and seals and slides.

[0019] As for the sealing sliding arrangement of the overflow piston 5 and the pressure relief piston 10 along the side wall of the overflow pressure regulating chamber, specifically, it is achieved by a sealing ring or a sealing piston ring arranged around the overflow piston 5 and the pressure relief piston 10.

[0020] In one embodiment, the pressure relief channel 11 , the overflow piston 5 and the pressure relief piston 10 are coaxially arranged.

[0021] In one embodiment, the breathing port 1 is located on the side wall of the overflow pressure regulating chamber above the pressure relief piston 10 .

[0022] In one embodiment, the regulating springs 16 are two springs arranged inside and outside.

[0023] The use process of the present invention is as follows:

[0024] Gas with a certain pressure flows along the air inlet channel 6 to the bottom of the overflow piston 5. Driven by the gas pressure, the overflow piston 5 slides upward, thereby opening the overflow valve 9 and the overflow valve port 8, and the gas enters the air outlet channel 7, and then enters the subsequent process; as the gas pressure continues to increase or suddenly increases, the increased gas pressure continues to push the overflow piston 5 to slide upward until it reaches the limiting structure 15, thereby stopping sliding, and the gas pressure pushes the pressure relief piston 10 along the pressure relief channel 11, thereby opening the pressure relief valve 9 and the pressure relief valve port 8, so that the gas is discharged from the pressure relief exhaust port 14, thereby reducing the pressure in the air inlet channel 6 until the pressure relief valve 9 and the pressure relief valve port 8 are closed, realizing the normal air supply function of the overflow valve. Of course, the normal air supply process of the overflow valve is not elaborated in detail.

[0025] Obviously, the above embodiments are merely examples for clarity of explanation and are not intended to limit the implementation methods. Those skilled in the art will readily appreciate that other variations or modifications based on the above descriptions are possible. It is not necessary and impossible to enumerate all implementation methods here. Obvious variations or modifications arising therefrom remain within the scope of protection of the present invention.

Claims

1. A relief valve with a pressure relief function, characterized in that: The vent valve is provided with a cover having a breathing port and a main valve body adapted to the cover. An overflow pressure regulating chamber is formed between the main valve body and the cover. An overflow piston sealingly sliding along the side wall of the overflow pressure regulating chamber and an overflow pressure regulating assembly adapted to the overflow piston are provided in the overflow pressure regulating chamber. An air inlet channel and an air outlet channel adapted to the overflow piston are formed in the main valve body. One end of the air outlet channel forms an overflow valve port. An overflow valve adapted to the overflow valve port is provided at the lower end of the overflow piston. The vent valve is provided at the overflow valve port. A pressure relief piston is sealed and slides along the side wall of the overflow pressure regulating chamber between the piston and the overflow pressure regulating assembly, and passes through the overflow valve and the overflow piston to form a pressure relief channel connected to the air outlet channel. One end of the pressure relief channel forms a pressure relief valve port, and a pressure relief valve adapted to the pressure relief valve port is provided at the lower end of the pressure relief piston; a pressure relief exhaust port is formed on the side wall of the overflow pressure regulating chamber between the pressure relief piston and the overflow piston; the overflow pressure regulating chamber is also provided with a limiting structure for limiting the moving distance of the overflow piston.

2. The relief valve with pressure relief function according to claim 1, characterized in that: The upper cover is a hollow structure with one end open, and the main valve body is formed with a hollow structure with one end open. The open end of the upper cover forms an external thread, and the open end of the main valve body forms an internal thread, and the external thread of the upper cover is screwed into the internal thread of the main valve body; the limiting structure is the end of the open end of the upper cover that is screwed into the internal thread of the main valve body; the overflow piston is located at the lower part of the open end of the upper cover and slides in a sealing manner in the overflow pressure regulating cavity; The pressure relief piston is located in the overflow pressure regulating chamber in the upper cover and slides in a sealed manner.

3. The relief valve with pressure relief function according to claim 1 or 2, characterized in that: The pressure relief passage, the overflow piston and the pressure relief piston are coaxially arranged.

4. The relief valve with pressure relief function according to claim 3, characterized in that: The breathing port is located on the side wall of the overflow pressure regulating chamber above the pressure relief piston.

5. The relief valve with pressure relief function according to claim 4, characterized in that: The overflow pressure regulating assembly includes an regulating spring located above the pressure relief piston and abutting against the pressure relief piston, a spring seat abutting against the other end of the regulating spring, and an regulating bolt for adjusting the spring seat through the top wall of the upper cover.

6. The relief valve with pressure relief function according to claim 5, characterized in that: The regulating springs are two arranged inside and outside.

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