Pneumatic control valve with mechanical sealing structure

Abstract

The utility model provides a pneumatic control valve with a mechanical sealing structure. The pneumatic control valve comprises a valve cover, a valve body, a piston, a pressing rod and a base, the valve cover is connected with the top end of the valve body; a piston is arranged in the valve body, and the valve cover is provided with an air inlet and outlet hole and communicated with an upper cavity of the valve body; the side surface of the valve body is provided with a test air hole communicated with the lower cavity of the valve body; the pressing rod valve body is fixedly connected with the piston, a rubber ring is arranged at the end of the pressing rod, the base is fixedly connected with the bottom end of the valve body, a sealing seat is arranged in the center of the base, a through hole is formed in the middle of the sealing seat, a passing cavity is formed between the base and the valve body, and the sealing seat can be matched with the rubber ring of the pressing rod to seal the passing cavity. An inlet and an outlet are formed in the two ends of the base respectively, and the inlet is communicated with the outlet through the sealing seat and the passing cavity. The air tightness testing device is suitable for air tightness testing occasions with strict volume requirements, and improves the sensitivity of air tightness testing.

Description

Technical Field

[0001] The utility model belongs to the field of air-controlled valves, in particular to an air-controlled valve with a mechanical sealing structure. Background Art

[0002] For airtightness testing occasions with very strict volume requirements, the existing air-controlled valves on the market have no mechanical limit on the position of the sealing rubber ring. When sealing is achieved, the rubber ring is still continuously compressed, causing the volume of the cavity formed by the seal to change with the air pressure. When it is necessary to detect the airtightness between various components, the test sensitivity is very low and cannot meet the requirements. Utility Model Content

[0003] In view of this, the utility model aims to provide an air-controlled valve with a mechanical sealing structure, which is suitable for air-tightness testing occasions with very strict volume requirements and improves the sensitivity of the air-tightness test.

[0004] In order to achieve the above-mentioned purpose, the technical solution of the utility model is achieved as follows:

[0005] A pneumatically controlled valve with a mechanical seal structure comprises a valve cover, a valve body, a piston, a pressure rod, and a base; the valve cover is fixedly connected to the top end of the valve body; a piston is provided inside the valve body, which divides the inner cavity of the valve body into an upper cavity and a lower cavity; the valve cover is provided with an air inlet and outlet hole, which is connected to the upper cavity of the valve body; a test air hole is provided on the side of the valve body, which is connected to the lower cavity of the valve body;

[0006] The pressure rod passes through the valve body from the bottom of the valve body and is fixedly connected to the piston. The piston moves up and down to drive the pressure rod to move up and down. A rubber ring is provided at the end of the pressure rod.

[0007] The base is fixedly connected to the bottom end of the valve body, a sealing seat is provided in the center of the base, a through hole is provided in the middle of the sealing seat, a through cavity is formed between the base and the valve body, and the sealing seat can cooperate with the rubber ring of the pressure rod to achieve sealing of the through cavity;

[0008] An inlet and an outlet are respectively provided at both ends of the base, and the inlet is communicated with the outlet through a sealing seat and a cavity.

[0009] Furthermore, a sealing ring is provided between the valve cover and the valve body, a sealing ring is provided between the piston and the inner cavity of the valve body, a sealing ring is provided between the pressure rod and the valve body, a sealing ring is provided between the valve body and the base, and a sealing ring is provided between the sealing seat and the base.

[0010] Furthermore, the pressure rod has a T-shaped structure, and a stepped groove is formed at the bottom end of the valve body. The stepped groove and the T-shaped structure of the pressure rod fit together to form a limit.

[0011] Furthermore, the bottom end of the pressure rod is provided with an annular groove, the rubber ring is arranged in the annular groove, the top of the sealing seat is a conical structure, the middle part is provided with a groove, and a stepped hole is formed between the groove and the through hole;

[0012] The outer diameter of the top of the sealing seat is a, the inner diameter of the rubber ring is b, and the outer diameter of the rubber ring is c, then b <a<c。

[0013] Furthermore, the end surface of the central column formed in the middle of the annular groove is also a tapered structure, and the end surface of the central column can cooperate with the through hole to form a tapered surface.

[0014] Furthermore, the end of the central column formed in the middle of the annular groove is provided with a limiting structure, which can limit the position of the rubber ring.

[0015] Compared with the prior art, the air-controlled valve with a mechanical seal structure described in the present invention has the following advantages:

[0016] (1) The utility model is an air-controlled valve with a mechanical seal structure. The volume is smaller than that of air-controlled valves on the market. It can be used in air-tightness test occasions with very strict volume requirements, thereby improving the sensitivity of air-tightness test.

[0017] (2) The utility model is an air-controlled valve with a mechanical sealing structure. Through the limit design of the rubber ring, it can ensure that the volume of the inner cavity remains stable while achieving sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings, which constitute part of the present invention, are intended to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are intended to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 This is a schematic diagram of an air-controlled valve with a mechanical seal structure according to an embodiment of the present utility model;

[0020] Figure 2 This is a cross-sectional view of an air-controlled valve with a mechanical seal structure according to an embodiment of the present utility model.

[0021] Description of reference numerals:

[0022] 1. Valve cover; 11. Inlet and outlet holes; 2. Valve body; 21. Test air hole; 3. Piston; 4. Pressure rod; 41. Annular groove; 42. Center column; 43. Limiting mechanism; 5. Base; 6. Sealing seat; 61. Through hole; 7. Rubber ring; 81. Upper chamber; 82. Lower chamber; 83. Through chamber. DETAILED DESCRIPTION

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features therein can be combined with each other.

[0024] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing 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 limiting the present invention. In addition, the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0025] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.

[0027] An air-controlled valve with a mechanical seal structure, such as Figure 1 Figure 2 As shown, it includes a valve cover 1, a valve body 2, a piston 3, a pressure rod 4 and a base 5; the valve cover 1 is fixedly connected to the top of the valve body 2; a piston 3 is provided inside the valve body 2, and the piston 3 divides the inner cavity of the valve body 2 into an upper cavity 81 and a lower cavity 82; the valve cover 1 is provided with an air inlet and outlet hole 11, which is connected to the upper cavity 81 of the valve body 2; a test air hole 21 is provided on the side of the valve body 2, which is connected to the lower cavity 82 of the valve body 2;

[0028] The air inlet and outlet holes 11 are connected to the driving air source, and the test air holes 21 are connected to the test air source;

[0029] The pressure rod 4 passes through the valve body 2 from the bottom of the valve body 2 and is fixedly connected to the piston 3. The piston 3 moves up and down to drive the pressure rod 4 to move up and down. A rubber ring 7 is provided at the end of the pressure rod 4.

[0030] The base 5 is fixedly connected to the bottom end of the valve body 2. A sealing seat 6 is provided at the center of the base 5. A through hole 61 is provided in the middle of the sealing seat 6. A through cavity 83 is formed between the base 5 and the valve body 2. The sealing seat 6 can cooperate with the rubber ring 7 of the pressure rod 4 to seal the through cavity 83.

[0031] An inlet and an outlet are respectively provided at both ends of the base 5. The inlet is communicated with the outlet through the sealing seat 6 and the through cavity 83.

[0032] Preferably, a sealing ring is provided between the valve cover 1 and the valve body 2, a sealing ring is provided between the piston 3 and the inner cavity of the valve body 2, a sealing ring is provided between the pressure rod 4 and the valve body 2, a sealing ring is provided between the valve body 2 and the base 5, and a sealing ring is provided between the sealing seat 6 and the base 5 to improve the sealing performance.

[0033] Preferably, the pressure rod 4 has a T-shaped structure. A stepped groove is formed at the bottom end of the valve body 2. The stepped groove and the T-shaped structure of the pressure rod 4 fit together to form a limit and can also play a role in linear guidance.

[0034] Preferably, an annular groove 41 is provided at the bottom end of the pressure rod 4. The rubber ring 7 is arranged in the annular groove 41. The top of the sealing seat 6 is of a conical structure, and a groove is provided in the middle. A stepped hole is formed between the groove and the through hole 61.

[0035] The outer diameter of the top of the sealing seat 6 is a, the inner diameter of the rubber ring 7 is b, and the outer diameter of the rubber ring 7 is c. Then b < a < c. This design can make the end face of the sealing seat 6 fully contact with the rubber ring 7, reduce the contact area, and improve the sealing performance.

[0036] Preferably, the end face of the central column 42 formed in the middle of the annular groove 41 is also of a conical structure. The end face of the central column 42 can form a conical surface fit with the through hole 61.

[0037] Preferably, a limiting structure is provided at the end of the central column 42 formed in the middle of the annular groove 41 to limit the rubber ring 7.

[0038] Working principle: Install this pneumatic valve on the pipeline. Drive the piston 3 by introducing a driving air source through the air inlet and outlet holes 11. For air intake, the piston 3 moves downward, and the pressure rod 4 closely contacts the sealing seat 6, and the valve closes; for air exhaust, the piston 3 moves upward, and the pressure rod 4 separates from the sealing seat 6, and the valve opens.

[0039] Then when it is necessary to detect the airtightness of the pipeline, introduce a test air source into the test air hole 21, detect the air pressure change, and complete the detection of the airtightness of the pneumatic valve.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An air-controlled valve with a mechanical seal structure, characterized in that: Including valve cover, valve body, piston, pressure rod and base; The valve cover is fixedly connected to the top of the valve body; a piston is provided inside the valve body, which divides the inner cavity of the valve body into an upper cavity and a lower cavity; the valve cover is provided with an air inlet and outlet hole, which is connected to the upper cavity of the valve body; a test air hole is provided on the side of the valve body, which is connected to the lower cavity of the valve body; The pressure rod passes through the valve body from the bottom of the valve body and is fixedly connected to the piston. The piston moves up and down to drive the pressure rod to move up and down. A rubber ring is provided at the end of the pressure rod. The base is fixedly connected to the bottom end of the valve body, a sealing seat is provided in the center of the base, a through hole is provided in the middle of the sealing seat, a through cavity is formed between the base and the valve body, and the sealing seat can cooperate with the rubber ring of the pressure rod to achieve sealing of the through cavity; An inlet and an outlet are respectively provided at both ends of the base, and the inlet is communicated with the outlet through a sealing seat and a cavity.

2. The air-controlled valve with a mechanical seal structure according to claim 1, characterized in that: A sealing ring is provided between the valve cover and the valve body, a sealing ring is provided between the piston and the inner cavity of the valve body, a sealing ring is provided between the pressure rod and the valve body, a sealing ring is provided between the valve body and the base, and a sealing ring is provided between the sealing seat and the base.

3. The air-controlled valve with a mechanical seal structure according to claim 1, characterized in that: The pressure rod is in a T-shaped structure, and a stepped groove is formed at the bottom end of the valve body. The stepped groove and the T-shaped structure of the pressure rod fit together to form a limit.

4. The air-controlled valve with a mechanical seal structure according to claim 1, characterized in that: The bottom end of the pressure rod is provided with an annular groove, the rubber ring is arranged in the annular groove, the top of the sealing seat is a conical structure, the middle part is provided with a groove, and a stepped hole is formed between the groove and the through hole; The outer diameter of the top of the sealing seat is a, the inner diameter of the rubber ring is b, and the outer diameter of the rubber ring is c, then b <a<c。 5. The air-controlled valve with a mechanical seal structure according to claim 4, characterized in that: The end surface of the central column formed in the middle of the annular groove is also a tapered structure, and the end surface of the central column can cooperate with the through hole to form a tapered surface.

6. The air-controlled valve with a mechanical seal structure according to claim 5, characterized in that: The end of the central column formed in the middle of the annular groove is provided with a limiting structure, which can limit the position of the rubber ring.

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