A piston type gas valve

Abstract

The utility model discloses a piston type gas valve, comprising a valve body, one end of the valve body is provided with an air inlet pipe, the other end is provided with an air outlet pipe, a vertically distributed baffle is provided at the connection between the inner cavity of the valve body and the air outlet pipe, a sealing plate is provided between the top of the baffle and the air inlet pipe, a first vent hole is provided on the surface of the sealing plate, and a second vent hole is formed between the sealing plate, the valve body and the air outlet pipe. The utility model adjusts the up and down position of the first sealing plug by means of a worm gear, so that the turntable does not need to move up and down outside the valve body, so that the size of the external space of the installation position of the valve is relatively low, which greatly improves its adaptability and has strong practicality.

Description

Technical Field

[0001] The utility model belongs to the technical field of gas valves, and in particular relates to a piston type gas valve. Background Art

[0002] Gas valves are widely used in daily life or manufacturing industry. Valves can be used to open a channel so that the gases at both ends of the channel can flow to each other; valves can also be used to close the channel so that the gases at both ends of the channel are isolated. Especially in semiconductor equipment, gas valves are widely used, but because gas is easy to leak, gas valves without good sealing performance will leak gas, resulting in gas waste. If the gas is toxic, it will pose a threat to human life safety.

[0003] After searching, the Chinese patent with announcement number CN201599431U discloses a piston-type gas valve, including a shell, the upper end of the shell has a top plate, the lower end has a bottom plate, the shell, the bottom plate and the top plate form a storage space, the side wall of the shell has an inlet, the middle of the bottom plate has an outlet, and the top plate has a through hole. The valve also includes a slidable valve stem, one end of the valve stem is placed in the shell and connected to the valve core, and the other end passes through the shell through the through hole on the top plate. The valve stem drives the valve core to slide up and down in the shell, and at least one sealing element is provided between the valve core and the valve stem located in the shell, and the side wall of the sealing element contacts the inner wall of the shell. The utility model has the advantage of good sealing. However, when the gas valve is in use, when the sealing element is controlled to move up and down, the valve stem connected to the sealing element will also move up and down, so the valve stem has a large requirement for the external space of the valve installation position, and the external space needs to be sufficient for its up and down movement outside the valve, which is poor in practicality. Utility Model Content

[0004] The utility model aims to provide a piston type gas valve to solve the technical problems raised in the background technology.

[0005] To achieve the above-mentioned objectives, the specific technical scheme of the utility model is as follows: a piston type gas valve comprises a valve body, one end of the valve body is provided with an air inlet pipe, the other end is provided with an air outlet pipe, a vertically distributed baffle is provided at the connection between the inner cavity of the valve body and the air outlet pipe, a sealing plate is provided between the top end of the baffle and the air inlet pipe, a first air vent is provided on the surface of the sealing plate, a second air vent is formed between the sealing plate, the valve body and the air outlet pipe, a first sealing plug which can move up and down is provided in the first vent, a second sealing plug which can move left and right is provided in the second vent, a driving structure for driving the first sealing plug to move up and down is provided in the valve body, and an elastic reset structure connected to the second sealing plug is provided in the air outlet pipe.

[0006] Preferably, the first vent hole is composed of a circular hole and a conical hole, the conical hole is located at the bottom of the circular hole, the bottom of the conical hole is small and the top is large, the top diameter of the conical hole is equal to the diameter of the circular hole, and the first sealing plug is consistent with the first vent hole.

[0007] Preferably, the second ventilation hole is a conical structure, with a small left end and a large right end of the second ventilation hole, and the second sealing plug is consistent with the second ventilation hole.

[0008] Preferably, the driving structure includes a worm and a worm wheel, the worm is vertically arranged in the inner cavity of the valve body, and the worm is rotatably connected to the valve body through a bearing, a transverse connecting shaft is sleeved on the worm wheel, and the connecting shaft is rotatably connected to the valve body through a bearing, a protrusion is provided on the end side wall of the connecting shaft, and the surface of the protrusion is rotatably connected to a connecting rod through a rotating shaft, the bottom of the connecting rod is rotatably connected to the middle part of the upper surface of the first sealing plug through a rotating shaft, and the worm wheel is rotatably connected to the worm, the worm wheel and the worm are meshed with each other, the top end of the worm extends to the top of the valve body and is provided with a turntable, and a seal is provided at the connection between the worm and the valve body.

[0009] Preferably, a semicircular groove is provided at the left end of the second sealing plug.

[0010] Preferably, a limiting rod is provided in the middle part of the bottom of the first sealing plug, and a limiting cylinder corresponding to the limiting rod is provided at the bottom of the inner cavity of the valve body, and the bottom of the limiting rod extends to the inner cavity of the limiting cylinder and is connected to the limiting cylinder by sliding up and down through the first slider.

[0011] Preferably, the elastic reset structure includes a connecting seat, which is fixedly connected to the back of the second sealing plug, and the top inner wall of the air outlet pipe is provided with a fixing plate distributed opposite to the connecting seat, and the fixing plate and the connecting seat are connected by a reset spring.

[0012] Preferably, a second sliding block is provided at the top end of the connecting seat, and a sliding groove slidably connected to the second sliding block is provided at the inner wall of the top end of the air outlet pipe.

[0013] The piston type gas valve of the utility model has the following advantages:

[0014] 1. The utility model adjusts the up and down position of the first sealing plug by means of a worm gear, so that the turntable does not need to move up and down outside the valve body, so that the external space size requirement of the installation position of the valve is relatively low, which greatly improves its adaptability and practicality.

[0015] 2. The utility model provides a good sealing effect for the gas valve through the cooperation between the first sealing plug and the second sealing plug, which can effectively prevent gas leakage and greatly improve the safety of the use of the gas valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solution of the implementation mode of the utility model, the drawings required for use in the implementation mode will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the inner cavity of the valve body in the utility model;

[0019] Figure 3 This is a connection diagram of the first sealing plug and the worm in the utility model;

[0020] Figure 4 for Figure 1 A is an enlarged view of the middle image.

[0021] Explanation of the markings in the figure: 1. valve body; 2. air inlet pipe; 3. air outlet pipe; 4. sealing plate; 5. baffle; 6. first sealing plug; 7. connecting rod; 8. connecting shaft; 9. worm gear; 10. worm; 11. turntable; 12. limit rod; 13. first air vent; 14. second air vent; 15. slide groove; 16. bump; 17. limit cylinder; 18. first slider; 19. fixing plate; 20. return spring; 21. second sealing plug; 22. semicircular groove; 23. connecting seat; 24. second slider. DETAILED DESCRIPTION

[0022] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the embodiments of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0023] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc. indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention.

[0024] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0025] In the embodiments of the present utility model, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0026] The disclosure below provides many different embodiments or examples for realizing different structures of the embodiments of the present utility model. In order to simplify the disclosure of the embodiments of the present utility model, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the embodiments of the present utility model. In addition, the embodiments of the present utility model can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed.

[0027] In order to better understand the purpose, structure and function of the utility model, the following is a further detailed description of a piston type gas valve of the utility model in conjunction with the accompanying drawings.

[0028] like Figure 1-4As shown, a piston-type gas valve of the utility model comprises a valve body 1, one end of the valve body 1 is provided with an air inlet pipe 2, and the other end is provided with an air outlet pipe 3, a vertically distributed baffle plate 5 is provided at the connection between the inner cavity of the valve body 1 and the air outlet pipe 3, a sealing plate 4 is provided between the top end of the baffle plate 5 and the air inlet pipe 2, a first air vent 13 is provided on the surface of the sealing plate 4, a second air vent 14 is formed between the sealing plate 4 and the valve body 1 and the air outlet pipe 3, a first sealing plug 6 which can move up and down is provided in the first air vent 13, and the first air vent 13 is provided with a first sealing plug 6 which can move up and down. The hole 13 is composed of a circular hole and a conical hole. The conical hole is located at the bottom of the circular hole. The bottom of the conical hole is small and the top is large. The top diameter of the conical hole is equal to the diameter of the circular hole. The first sealing plug 6 is consistent with the first vent hole 13. Through the cooperation between the conical hole and the circular hole, when the first sealing plug 6 enters the first vent hole 13, it will completely coincide with the first vent hole 13, which has a good sealing effect. When the first sealing plug 6 enters the first vent hole 13, it will not pass through the first vent hole 13. A second sealing plug 21 that can move left and right is arranged in the second vent hole 14. The second vent hole 14 is a conical structure. The left end of the second vent hole 14 is small and the right end is large. The second sealing plug 21 is consistent with the second vent hole 14. When the second sealing plug 21 enters the second vent hole 14, it will completely coincide with the second vent hole 14, which has a good sealing effect. A semicircular groove 22 is disposed at the left end of the second sealing plug 21. Through the provision of the semicircular groove 22, the end of the second sealing plug 21 located in the inner cavity of the valve body 1 is concave, which is conducive to gas flushing it open.

[0029] A driving structure for driving the first sealing plug 6 to move up and down is arranged in the valve body 1, and the driving structure includes a worm 10 and a worm wheel 9. The worm 10 is vertically arranged in the inner cavity of the valve body 1, and the worm 10 is rotatably connected to the valve body 1 through a bearing. A horizontal connecting shaft 8 is sleeved on the worm wheel 9, and the connecting shaft 8 is rotatably connected to the valve body 1 through a bearing. A protrusion 16 is arranged on the end side wall of the connecting shaft 8, and the surface of the protrusion 16 is rotatably connected to the connecting rod 7 through a rotating shaft. The bottom of the connecting rod 7 is rotatably connected to the middle part of the upper surface of the first sealing plug 6 through a rotating shaft, and the worm wheel 9 is rotatably connected to the worm 10, and the worm wheel 9 and the worm 10 are meshed with each other. The top of the worm 10 extends to the top of the valve body 1 and is provided with a turntable 11, and a seal is provided at the connection between the worm 10 and the valve body 1. By rotating the turntable 11 forward, the turntable 11 drives the worm 10 to rotate forward. Under the action of the worm gear 9, the connecting shaft 8 rotates with the worm gear 9, so that the protrusion 16 drives the connecting rod 7 to move upward, so that the connecting rod 7 drives the first sealing plug 6 to move upward, so that the first sealing plug 6 is separated from the first vent 13. At this time, the gas will enter the lower part of the inner cavity of the valve body 1 from the intake pipe 2, and then enter the upper part of the inner cavity of the valve body 1 through the first vent 13, and then The gas impacts the second sealing plug 21, causing the second sealing plug 21 to move rightward, thereby causing the second sealing plug 21 to detach from the second vent hole 14. Finally, the gas is discharged through the second vent hole 14 via the gas outlet pipe 3. The turntable 11 is reversed. Under the cooperation of the worm 10, the worm wheel 9, the connecting shaft 8 and the connecting rod 7, the first sealing plug 6 moves down into the first vent hole 13. At this time, the gas entering the intake pipe 2 will not enter the upper part of the inner cavity of the valve body 1. There is no gas in the valve body 1 to pressurize the second sealing plug 21. Under the action of the elastic reset structure, the second sealing plug 21 moves rightward into the second vent hole 14. In the air hole 14, under the action of the two sealing structures, a good sealing effect is achieved, which can effectively prevent gas leakage. If there is a leak at the first sealing plug 6, only a small amount of gas will leak into the upper part of the inner cavity of the valve body 1. The impact of this small amount of gas is not enough to break open the second sealing plug 21. Therefore, the design of the second sealing plug 21 has a good protective effect. The up and down position of the first sealing plug 6 is adjusted by a worm gear, so that the turntable 11 does not need to move up and down outside the valve body 1, so that the external space size requirement of the installation position of the valve is relatively low, which greatly improves its adaptability and practicality. A limiting rod 12 is provided at the middle part of the bottom of the first sealing plug 6, and a limiting cylinder 17 corresponding to the limiting rod 12 is provided at the bottom of the inner cavity of the valve body 1. The bottom of the limiting rod 12 extends to the inner cavity of the limiting cylinder 17 and is connected to the limiting cylinder 17 by sliding up and down through a first slider 18. Through the cooperation between the limiting rod 12, the first slider 18 and the limiting cylinder 17, a good limiting effect is achieved on the first sealing plug 6, so that the first sealing plug 6 can only move up and down, thereby improving the stability of the structure.

[0030] An elastic reset structure connected to the second sealing plug 21 is provided in the air outlet pipe 3, and the elastic reset structure includes a connecting seat 23, and the connecting seat 23 is fixedly connected to the back of the second sealing plug 21. A fixing plate 19 is provided on the inner wall of the top end of the air outlet pipe 3 and is distributed opposite to the connecting seat 23. The fixing plate 19 and the connecting seat 23 are connected by a reset spring 20. Through the setting of the reset spring 20, the fixing plate 19 and the connecting seat 23, when no external force acts on the second sealing plug 21, the second sealing plug 21 will be firmly located in the second vent hole 14 for sealing. When the gas pressure entering the inner cavity of the valve body 1 is greater than the elastic force of the reset spring 20, the second sealing plug 21 will move to the right, thereby exposing the second vent hole 14. A second slider 24 is provided at the top of the connecting seat 23, and a slide groove 15 slidably connected to the second slider 24 is provided on the inner wall of the top of the air outlet pipe 3. Through the cooperation between the second slider 24 and the slide groove 15, a limiting effect is played on the connecting seat 23, making the connecting seat 23 more stable and reliable when moving.

[0031] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A piston type gas valve, characterized in that: The invention comprises a valve body (1), one end of the valve body (1) is provided with an air inlet pipe (2), and the other end of the valve body (1) is provided with an air outlet pipe (3), a vertically distributed baffle plate (5) is provided at the connection between the inner cavity of the valve body (1) and the air outlet pipe (3), a sealing plate (4) is provided between the top end of the baffle plate (5) and the air inlet pipe (2), a first air vent (13) is provided on the surface of the sealing plate (4), a second air vent (14) is formed between the sealing plate (4), the valve body (1) and the air outlet pipe (3), a first sealing plug (6) movable up and down is provided in the first air vent (13), a second sealing plug (21) movable left and right is provided in the second air vent (14), a driving structure for driving the first sealing plug (6) to move up and down is provided in the valve body (1), and an elastic reset structure connected to the second sealing plug (21) is provided in the air outlet pipe (3).

2. A piston type gas valve according to claim 1, characterized in that: The first vent hole (13) is composed of a circular hole and a conical hole, the conical hole is located at the bottom of the circular hole, the bottom of the conical hole is small and the top is large, the top diameter of the conical hole is equal to the diameter of the circular hole, and the first sealing plug (6) is consistent with the first vent hole (13).

3. A piston type gas valve according to claim 1, characterized in that: The second ventilation hole (14) is a conical structure, with a small left end and a large right end of the second ventilation hole (14), and the second sealing plug (21) is consistent with the second ventilation hole (14).

4. A piston type gas valve according to claim 1, characterized in that: The driving structure comprises a worm (10) and a worm wheel (9), wherein the worm (10) is vertically arranged in the inner cavity of the valve body (1), and the worm (10) is rotatably connected to the valve body (1) via a bearing, a horizontally arranged connecting shaft (8) is sleeved on the worm wheel (9), and the connecting shaft (8) is rotatably connected to the valve body (1) via a bearing, a protrusion (16) is arranged on the end side wall of the connecting shaft (8), and the surface of the protrusion (16) is rotatably connected to a connecting rod (7) via a rotating shaft, and the bottom of the connecting rod (7) is rotatably connected to the middle part of the upper surface of the first sealing plug (6) via a rotating shaft, and the worm wheel (9) is rotatably connected to the worm (10), and the worm wheel (9) and the worm (10) are meshed with each other, the top end of the worm (10) extends to the top of the valve body (1) and is provided with a rotating disk (11), and a sealing member is provided at the connection between the worm (10) and the valve body (1).

5. The piston type gas valve according to claim 1, characterized in that: A semicircular groove (22) is provided at the left end of the second sealing plug (21).

6. A piston type gas valve according to claim 1, characterized in that: A limiting rod (12) is arranged at the middle part of the bottom of the first sealing plug (6), and a limiting cylinder (17) corresponding to the limiting rod (12) is arranged at the bottom of the inner cavity of the valve body (1), and the bottom of the limiting rod (12) extends to the inner cavity of the limiting cylinder (17) and is connected to the limiting cylinder (17) by sliding up and down through a first sliding block (18).

7. A piston type gas valve according to claim 1, characterized in that: The elastic reset structure comprises a connecting seat (23), the connecting seat (23) being fixedly connected to the back of the second sealing plug (21), the top inner wall of the air outlet pipe (3) being provided with a fixing plate (19) arranged opposite to the connecting seat (23), the fixing plate (19) and the connecting seat (23) being connected via a reset spring (20).

8. A piston type gas valve according to claim 7, characterized in that: A second sliding block (24) is provided at the top end of the connection seat (23), and a sliding groove (15) slidably connected to the second sliding block (24) is provided at the inner wall of the top end of the air outlet pipe (3).

Images