Overflow valve with pressure relief

Abstract

The utility model discloses a kind of overflow valve with pressure relief function, limit structure is arranged in the overflow pressure regulating cavity, the moving distance of the overflow piston is limited, when the front end pressure of pipeline is too large, the pressure relief piston movement is promoted, and then pressure relief valve is opened, so that excessive gas pressure passes pressure relief passage, pressure relief valve port and the cavity between the pressure relief piston and the overflow piston, and then discharge through pressure relief exhaust port, so as to reduce the gas pressure of the front end of pipeline, that is, excessive pressure in corresponding pipeline is reduced, and the problem that pipeline gas explosion occurs is avoided.

Description

Technical Field

[0001] This utility model relates to the field of overflow valve technology, specifically to an overflow valve with pressure relief function. Background Technology

[0002] An overflow valve is used in the air circuit control system of a vehicle's air supply system. This valve has one opening valve, providing 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, allowing gas at that pressure to enter through the open valve port and then through the pipeline to the downstream structure for control. When the gas pressure at the inlet drops to a certain level, the valve closes the gas passage. This ensures that the valve does not open when the gas pressure at the upstream end of the pipeline is insufficient, thus guaranteeing the control and usability of the upstream end. Furthermore, if a leak or venting occurs at the upstream end of the pipeline, the valve closes, ensuring a minimum pressure value at the downstream end of the pipeline to guarantee its basic control and usability requirements.

[0003] Although the existing relief valve can play the above-mentioned effective role and function, the single opening valve setting is insufficient to guarantee the pipeline explosion prevention problem caused by excessive pressure at the front end of the pipeline. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides an overflow valve with a pressure relief function, which includes an upper cover with a vent 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 that slides and seals along the side wall of the overflow pressure regulating chamber and an overflow pressure regulating assembly adapted to the overflow piston are disposed 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. The lower end of the overflow piston is adapted to the overflow valve port. The overflow valve is further comprising: a pressure relief piston located between the overflow piston and the overflow pressure regulating assembly, sliding along the side wall of the overflow pressure regulating chamber; a pressure relief channel formed through the overflow valve and the overflow piston and communicating with the outlet channel; one end of the pressure relief channel forming a pressure relief valve port; a pressure relief valve adapted to the pressure relief valve port being provided at the lower end of the pressure relief piston; a pressure relief vent port being formed on the side wall of the overflow pressure regulating chamber between the pressure relief piston and the overflow piston; and a limiting structure for restricting the movement distance of the overflow piston being provided in the overflow pressure regulating chamber. A limiting structure is provided in the overflow pressure regulating chamber. By limiting the movement 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. This allows the excessive gas pressure to pass through the pressure relief channel, the pressure relief valve port, and the cavity between the pressure relief piston and the overflow piston, and then be discharged through the pressure relief exhaust port. This reduces the gas pressure at the front end of the pipeline, thereby reducing the excessive pressure in the corresponding pipeline and preventing the pipeline from exploding.

[0005] Furthermore, the top cover is a cavity structure with one open end, and the main valve body also has a cavity structure with one open end. The open end of the top cover has an external thread, and the open end of the main valve body has an internal thread. The external thread of the top cover is screwed into the internal thread of the main valve body. The limiting structure is the end of the top cover that is screwed into the internal thread of the main valve body. The overflow piston is located in the overflow pressure regulating cavity below the open end of the top cover and slides in a sealed manner. The pressure relief piston is located in the overflow pressure regulating cavity inside the top cover and slides in a sealed manner. By setting the internal and external thread structure, the screwed-in end of the top cover is designated as a limiting structure, reducing the need for a separate limiting structure. Combined with the internal and external thread installation, a portion of the top cover structure forms the limiting structure, simplifying the overall structure while achieving the limiting purpose.

[0006] Furthermore, the pressure relief channel, the overflow piston, and the pressure relief piston are coaxially arranged. This coaxial arrangement allows the three components to move more stably under the impact of air pressure, reducing 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 adjusting spring located above and abutting against the pressure relief piston, a spring seat abutting against the other end of the adjusting spring, and an adjusting bolt for adjusting the spring seat via the top wall of the upper cover.

[0009] Furthermore, the adjusting spring consists of two springs arranged internally and externally. This double-spring structure prevents deviation when high-pressure gas impacts the overflow piston, thus preventing valve leakage and improving operational stability and service life. Attached Figure Description

[0010] To more clearly illustrate the technical solutions in the specific embodiments of this utility model, the drawings used in the specific embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0011] Figure 1 This is a schematic diagram of the overflow valve with pressure relief function according to this utility model;

[0012] The reference numerals in the diagram are as follows: 1-Breathing port; 2-Top cover; 4-Main valve body; 5-Overflow piston; 6-Inlet passage; 7-Outlet passage; 8-Overflow valve port; 9-Overflow valve; 10-Pressure relief piston; 11-Pressure relief passage; 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-Threaded assembly. Detailed Implementation

[0013] The present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Other embodiments derived by those skilled in the art from the embodiments of the present invention without inventive effort are all within the scope of protection of the present invention.

[0014] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0016] Furthermore, the technical features involved in the different embodiments of this utility model 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 breather 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. 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 one open end, and the main valve body 4 has a cavity structure with one open end. The open end of the upper cover 2 has an external thread, and the open end of the main valve body 4 has 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 is provided in the overflow pressure regulating chamber, which slides and seals along the side wall of the overflow pressure regulating chamber, and an overflow pressure regulating component adapted to the overflow piston 5. The above-mentioned sealing and sliding is achieved by setting an O-ring seal around the overflow piston 5. At this time, the sealing performance is good, which can ensure the high sealing performance requirements of the pipeline equipment.The main valve body 4 forms an air inlet channel 6 and an air outlet channel 7 adapted to the overflow piston 5. One end of the air outlet channel 7 forms an overflow valve port 8. Simultaneously, the lower end of the overflow piston 5 is provided with an overflow valve 9 adapted to the overflow valve port 8. Specifically, the lower end of the overflow piston 5 forms a valve groove, and the overflow valve 9, made of a flexible material such as rubber or silicone, is disposed within the valve groove. It also includes a sealing slide located between the overflow piston 5 and the overflow pressure regulating assembly, along the side wall of the overflow pressure regulating cavity. The pressure relief piston 10 is movable. The aforementioned sealing and sliding mechanism is achieved by setting a K-type sealing ring around the pressure relief piston, which has low movement resistance and ensures a relatively accurate pressure relief value. Specifically, the overflow pressure regulating assembly includes an adjusting spring 16 located above 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 that adjusts the spring seat 17 through the side wall of the upper cover 2. At the same time, a pressure relief channel is formed through the overflow valve 9 and the overflow piston 5, communicating with the air outlet channel 7. 11. Specifically, one end of the pressure relief channel 11 forms a pressure relief valve port 12, and the other end 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 made of flexible material, such as rubber or silicone, is provided in the valve groove. Pressure relief exhaust ports 14 are 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 them is not specifically limited. Preferably, they are evenly arranged in a circumferential direction. In this embodiment, two are symmetrically arranged. The overflow pressure regulating chamber is also provided with a limiting structure to restrict the movement distance of the overflow piston 5. The limiting structure can be configured in various ways. In this embodiment, the limiting structure 15 is the end of the opening end of the upper cover 2 that is screwed into the internal thread of 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 opening end of the upper cover 2 and is sealed and slides. The pressure relief piston 10 is located in the overflow pressure regulating chamber inside the upper cover 2 and is sealed and slides.

[0019] As for the overflow piston 5 and the pressure relief piston 10 being sealed and slidably arranged along the side wall of the overflow pressure regulating chamber, this is specifically achieved by a sealing ring or sealing piston ring circumferentially arranged on 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 adjusting spring 16 consists of two springs arranged inside and outside the spring.

[0023] The usage process of this utility model is as follows:

[0024] Gas under pressure travels along the intake channel 6 to the bottom of the overflow piston 5. Driven by this gas pressure, the overflow piston 5 slides upwards, opening the overflow valve 9 and the overflow port 8. Gas then enters the outlet channel 7 and proceeds to subsequent processes. As the gas pressure increases or suddenly increases, the increasing pressure continuously pushes the overflow piston 5 upwards until it reaches the limit structure 15, stopping its movement. Meanwhile, the gas pressure travels along the pressure relief channel 11 to push the pressure relief piston 10, opening the pressure relief valve 9 and the pressure relief port 8. Gas then exits from the pressure relief exhaust port 14, reducing the pressure within the intake channel 6 until the pressure relief valve 9 and the pressure relief port 8 close, thus achieving the normal gas supply function of the overflow valve. The normal gas supply process of the overflow valve will not be described in detail here.

[0025] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A relief valve with pressure relief function, characterized in that, It includes a top cover with a breathing port and a main valve body adapted to the top cover. An overflow pressure regulating chamber is formed between the main valve body and the top cover. An overflow piston that slides and seals along the side wall of the overflow pressure regulating chamber and an overflow pressure regulating assembly adapted to the overflow piston are disposed within the overflow pressure regulating chamber. An air inlet channel and an air outlet channel adapted to the overflow piston are formed within 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 disposed at the lower end of the overflow piston. It also includes a valve located at the overflow... A pressure relief piston, which slides in a sealed manner along the side wall of the overflow pressure regulating chamber between the piston and the overflow pressure regulating assembly, passes through the overflow valve and the overflow piston to form a pressure relief channel communicating with 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 to restrict the movement distance of the overflow piston.

2. The overflow valve with pressure relief function according to claim 1, characterized in that, The top cover is a cavity structure with one open end, and the main valve body has a cavity structure with one open end. The open end of the top cover has an external thread, and the open end of the main valve body has an internal thread. The external thread of the top cover is screwed into the internal thread of the main valve body. The limiting structure is the end of the top cover that is screwed into the internal thread of the main valve body. The overflow piston is located in the overflow pressure regulating cavity below the open end of the top cover and is sealed and slides. The pressure relief piston is located within the overflow pressure regulating chamber inside the upper cover and is sealed and slides.

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

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

6. The overflow valve with pressure relief function according to claim 5, characterized in that, The adjusting spring consists of two springs, one inside and one outside.

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