Novel throttle valve with airtight structure

Abstract

The utility model belongs to the technical field of valve control, and discloses a novel airtight structure throttling valve which comprises a valve body, an air inlet is formed in one side of the valve body, and an air outlet is formed in the other side of the valve body. A conical through hole and a columnar through groove which are communicated are formed in the middle of the valve body, the columnar through groove is located at the inlet end of the conical through hole, an air inlet hole is formed in the side wall of the columnar through groove and communicated with the air inlet, and the outlet end of the conical through hole directly leads to the air outlet. A conical valve core is arranged in the conical through hole; a valve rod is arranged on the valve core; a Y-shaped sealing ring is arranged on the periphery of the valve rod; the Y-shaped sealing ring is arranged in the fixing cavity, the fixing cavity is formed in the inner side wall of the columnar through groove, and the air inlet hole is located between the fixing cavity and the inlet end of the conical through hole. An inner lip of the Y-shaped sealing ring is attached to the periphery of the valve rod, and an outer lip is attached to the inner wall of the fixing cavity. And a valve rod seat is mounted in the columnar through groove. The sealing time is greatly prolonged, and the service life of the throttle valve is remarkably prolonged.

Description

Technical Field

[0001] This utility model belongs to the field of valve control technology, specifically a novel airtight throttle valve. Background Technology

[0002] A throttling valve is a type of flow control device that adjusts the valve orifice to achieve a specific ratio between gas velocity and flow rate, thereby controlling the gas flow. Throttling valves are widely used in industrial automation control systems and are crucial for flow and pressure control. However, existing throttling valves often experience gas leakage during use due to wear and aging of the internal sealing rings.

[0003] The relevant reference CN202756644U discloses a precision airflow throttle valve, including a valve body with an air inlet on one side and an air outlet on the other side; a valve seat is installed in the middle of the valve body, and a valve stem is sealed and screwed to the upper part of the blind hole of the valve seat. The air outlet on the valve seat is a conical hole, and the valve core that mates with the conical hole is a conical body. The valve stem on the upper side of the conical body has a necked section, and the valve stem above the necked section has a sealing convex ring. The lower end of the air outlet of the valve seat has a convex edge extending outward, and the convex edge is sealed and connected to the air outlet channel on the valve body that connects to the air outlet. A sealing ring is provided between the valve body and the valve seat. There are many sealing points, and the probability of leakage is high due to wear and aging of the sealing components at the sealing points. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a new type of airtight throttle valve that increases sealing time and extends service life.

[0005] To solve the above technical problems, this utility model provides a novel airtight throttle valve, including a valve body with an air inlet on one side and an air outlet on the other side; a conical through hole and a cylindrical through groove are connected in the middle of the valve body, the cylindrical through groove is located at the inlet end of the conical through hole, an air inlet hole is provided on the side wall of the cylindrical through groove, the air inlet hole and the air inlet are connected, and the outlet end of the conical through hole directly leads to the air outlet; a conical valve core is provided in the conical through hole; a valve stem is provided on the valve core; a Y-shaped sealing ring is provided on the outer periphery of the valve stem; the Y-shaped sealing ring is provided in a fixed cavity, which is located on the inner side wall of the cylindrical through groove, and the air inlet hole is located between the fixed cavity and the inlet end of the conical through hole; the inner lip of the Y-shaped sealing ring fits against the outer periphery of the valve stem, and the outer lip fits against the inner wall of the fixed cavity; a valve stem seat is installed in the cylindrical through groove.

[0006] By adopting the above technical solution, the outlet end of the tapered through hole leads directly to the air outlet, and the valve stem is sealed by the Y-type sealing ring in the fixed cavity, preventing leakage from the valve stem gap. An oil film is formed between the inner lip of the Y-type sealing ring and the sliding surface of the valve stem, improving friction conditions. After the lip wears, the medium pressure pushes the lip to fit against the sealing surface, automatically compensating for the gap. Compared with the convex ring on the tightening part and the traditional O-ring, the sealing time is greatly increased, and the service life of the throttle valve is significantly improved.

[0007] Preferably, a valve stem hole is provided in the middle of the valve stem seat.

[0008] By adopting the above technical solution, the valve stem is installed on the valve stem seat through the valve stem hole, thus preventing the valve stem from deflecting during operation.

[0009] Preferably, a copper-impregnated graphite ring is provided in the valve stem hole, and the valve stem passes through the copper-impregnated graphite ring.

[0010] By adopting the above technical solution, the valve stem achieves a seal between itself and the valve stem seat through a copper-impregnated graphite ring, which improves the lubrication of the valve stem extension and contraction while further ensuring the airtight performance.

[0011] Preferably, a sealing groove I is provided on the outer periphery of the valve stem seat, a sealing ring is provided in the sealing groove I, and a sealing groove II is provided on the inner wall of the cylindrical through groove. The valve stem seat and the cylindrical through groove are sealed by the sealing ring.

[0012] By adopting the above technical solution, the sealing ring is embedded in the sealing groove I on the outer periphery of the valve stem seat to achieve radial sealing, blocking the leakage path along the radial direction of the valve stem, and further ensuring the sealing effect.

[0013] Preferably, the valve stem seat is provided with an external thread on its outer periphery and an internal thread on the inner wall of the cylindrical through groove, and the valve stem seat and the cylindrical through groove are screwed together.

[0014] By adopting the above technical solution and using a threaded connection to install the valve stem seat, assembly is simple and disassembly and maintenance are convenient.

[0015] Preferably, the valve stem is connected to the actuator via a coupling, and the actuator is fixed to the valve body via a mounting post.

[0016] By adopting the above technical solutions and optimizing electromechanical integration, the throttle valve control can be made more efficient and intelligent.

[0017] Preferably, the mounting column and valve body adopt a triangular support structure.

[0018] By adopting the above technical solution, the weight of the actuator is evenly distributed, reducing the stress concentration factor of the valve body.

[0019] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0020] 1. The outlet end of the tapered through hole of this utility model directly leads to the air outlet. The valve stem is sealed by the Y-shaped sealing ring in the fixed cavity, and the airflow will not leak out from the valve stem gap. An oil film is formed between the inner lip of the Y-shaped sealing ring and the sliding surface of the valve stem, which improves the friction conditions. After the lip wears, the medium pressure pushes the lip to fit the sealing surface, automatically compensating for the gap. Compared with the convex ring on the tightening part and the traditional O-ring, the sealing time is greatly increased and the service life of the throttle valve is significantly improved.

[0021] 2. This utility model locks the Y-type sealing ring in the fixed cavity. The upper and lower end faces of the fixed cavity restrict the axial displacement of the Y-type sealing ring, preventing it from moving up and down with the reciprocating motion of the valve stem, which would affect the working stability of the Y-type sealing ring and ensure the long-term stable sealing performance of the throttle valve.

[0022] 3. The valve stem of this utility model achieves a seal between itself and the valve stem seat through a copper-impregnated graphite ring, which improves the lubrication of the valve stem's extension and retraction while further ensuring airtight performance. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of this utility model;

[0024] Figure 2 A schematic diagram showing the copper-impregnated graphite ring installed in the valve stem hole of this utility model;

[0025] Figure 3 This is a perspective view of the present utility model;

[0026] Figure 4 This is a schematic diagram showing the direct connection between the conical through hole and the air outlet inside the valve body of this utility model;

[0027] Figure 5 This is a schematic diagram of installing a Y-shaped sealing ring in the columnar through groove of this utility model.

[0028] Drawing numbers: 1. Valve body, 2. Inlet, 3. Outlet, 4. Conical through hole, 5. Cylindrical through groove, 6. Inlet hole, 7. Valve core, 8. Valve stem, 9. Y-type sealing ring, 10. Fixed cavity, 11. Inner lip, 12. Outer lip, 13. Mounting post, 14. Sealing groove I, 15. Valve stem hole, 16. Copper-impregnated graphite ring, 17. Valve stem seat, 18. Sealing groove II, 19. Sealing ring, 20. Coupling, 21. Actuator. Detailed Implementation

[0029] like Figure 1As shown, a novel airtight throttle valve includes a valve body 1, with an inlet 2 on one side and an outlet 3 on the other. A conical through-hole 4 and a cylindrical through-groove 5 are connected in the middle of the valve body 1, with the cylindrical through-groove 5 located at the inlet end of the conical through-hole 4. A valve stem seat 17 is fixedly mounted on the top of the cylindrical through-groove 5. The valve stem seat 17 has external threads on its outer circumference, and the cylindrical through-groove 5 has internal threads on its inner wall (not shown in the figure). The valve stem seat 17 and the cylindrical through-groove 5 are screwed together. The threaded connection method for installing the valve stem seat 17 simplifies assembly and facilitates disassembly and maintenance. A valve stem hole 15 is formed in the middle of the valve stem seat 17. The valve stem 8 is mounted on the valve stem seat 17 through the valve stem hole 15, preventing the valve stem 8 from tilting during operation.

[0030] like Figure 2 As shown, a copper-impregnated graphite ring 16 is provided in the valve stem hole 15, and the valve stem 8 passes through the copper-impregnated graphite ring 16. The valve stem 8 achieves a seal with the valve stem seat 17 through the copper-impregnated graphite ring 16, which improves the extension and lubrication of the valve stem 8 while further ensuring the airtight performance.

[0031] A sealing groove I14 is provided on the outer periphery of the valve stem seat 17, and a sealing ring 19 is provided in the sealing groove I14. A sealing groove II18 is provided on the inner wall of the cylindrical through groove 5. The valve stem seat 17 and the cylindrical through groove 5 are sealed by the sealing ring 19. After the sealing ring 19 is embedded in the sealing groove I14 on the outer periphery of the valve stem seat 17, it achieves radial sealing, blocks the leakage path along the radial direction of the valve stem 8, and further ensures the sealing effect.

[0032] like Figure 3 As shown, the valve stem 8 is connected to the actuator 21 via the coupling 20, and the actuator 21 is fixed to the valve body 1 via the mounting post 13. Through electromechanical integration optimization, the throttle valve control achieves high efficiency and intelligence.

[0033] The mounting column 13 and valve body 1 adopt a triangular support structure. This ensures even weight distribution of the actuator 21 and reduces the stress concentration factor of the valve body 1. The actuator 21 is an electrically operated telescopic rod. The electrically operated telescopic rod provides precise position control, ensuring accurate airflow regulation.

[0034] like Figure 4 As shown, an air inlet 6 is provided on the side wall of the cylindrical through-slot 5, which is connected to the air inlet 2. The outlet end of the conical through-hole 4 leads directly to the air outlet 3. A conical valve core 7 is provided in the conical through-hole 4; a valve stem 8 is provided on the valve core 7; and a Y-shaped sealing ring 9 is provided on the outer periphery of the valve stem 8.

[0035] like Figure 5As shown, the Y-type sealing ring 9 is disposed in the fixed cavity 10, which is located on the inner wall of the cylindrical through groove 5. The air inlet 6 is located between the fixed cavity 10 and the inlet end of the conical through hole 4. The inner lip 11 of the Y-type sealing ring 9 fits against the outer circumference of the valve stem 8, and the outer lip 12 fits against the inner wall of the fixed cavity 10. By locking the Y-type sealing ring 9 in the fixed cavity, the upper and lower end faces of the fixed cavity 10 restrict the axial displacement of the Y-type sealing ring 9, preventing it from moving up and down with the reciprocating motion of the valve stem 8, which would affect the working stability of the Y-type sealing ring 9 and ensure the long-term stable sealing performance of the throttle valve.

[0036] The outlet end of the conical through hole 4 in this application leads directly to the air outlet 3. The valve stem 8 is sealed by the Y-shaped sealing ring 9 in the fixed cavity 10. The airflow flows from the air inlet 6 on the side wall of the cylindrical through groove 5 through the conical through hole 4 to the air outlet 3, and will not leak out from the gap of the valve stem 8. An oil film is formed between the inner lip 11 of the Y-shaped sealing ring 9 and the sliding surface of the valve stem 8, which improves the friction conditions. After the lip wears, the medium pressure pushes the lip to fit the sealing surface, automatically compensating for the gap. Compared with the convex ring on the tightening part and the traditional O-ring, the sealing time is greatly increased and the service life of the throttle valve is significantly improved.

[0037] During operation, the valve core 7 is opened, and gas enters the valve body 1 through the inlet 2. The valve stem 8 has a Y-shaped sealing ring 9 on its outer circumference. The Y-shaped sealing ring 9 is installed in the fixed cavity 10 to prevent axial movement. The inner lip 11 of the Y-shaped sealing ring 9 fits against the outer circumference of the valve stem 8, and the outer lip 12 fits against the inner wall of the fixed cavity 10, preventing gas from flowing through the side wall of the valve stem 8. The gas directly enters the conical through-hole 4 through the inlet 6, and then flows from the outlet end of the conical through-hole 4 to the outlet 3, ensuring good sealing performance of the valve body 1.

[0038] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A novel airtight throttle valve, comprising a valve body (1), an air inlet (2) on one side of the valve body (1) and an air outlet (3) on the other side; characterized in that: The valve body (1) is provided with a conical through hole (4) and a cylindrical through groove (5) in the middle. The cylindrical through groove (5) is located at the inlet end of the conical through hole (4). An air inlet hole (6) is provided on the side wall of the cylindrical through groove (5). The air inlet hole (6) is connected to the air inlet (2). The outlet end of the conical through hole (4) is directly connected to the air outlet (3). A conical valve core (7) is provided in the conical through hole (4). A valve stem (8) is provided on the valve core (7). The valve stem (8) A Y-shaped sealing ring (9) is provided on the outer periphery; the Y-shaped sealing ring (9) is provided in the fixed cavity (10), the fixed cavity (10) is provided on the inner side wall of the columnar through groove (5), and the air inlet (6) is located between the inlet end of the fixed cavity (10) and the conical through hole (4); the inner lip (11) of the Y-shaped sealing ring (9) is fitted with the outer periphery of the valve stem (8), and the outer lip (12) is fitted with the inner wall of the fixed cavity (10); the valve stem seat (17) is installed in the columnar through groove (5).

2. The novel airtight throttle valve according to claim 1, characterized in that: A valve stem hole (15) is provided in the middle of the valve stem seat (17).

3. The novel airtight throttle valve according to claim 2, characterized in that: A copper-impregnated graphite ring (16) is provided in the valve stem hole (15), and the valve stem (8) passes through the copper-impregnated graphite ring (16).

4. The novel airtight throttle valve according to claim 1, characterized in that: The valve stem seat (17) is provided with a sealing groove I (14) on its outer periphery, and a sealing ring (19) is provided in the sealing groove I (14). The inner wall of the columnar through groove (5) is provided with a sealing groove II (18). The valve stem seat (17) and the columnar through groove (5) are sealed by the sealing ring (19).

5. The novel airtight throttle valve according to claim 4, characterized in that: The valve stem seat (17) is provided with an external thread on its outer periphery, and the inner wall of the cylindrical through groove (5) is provided with an internal thread. The valve stem seat (17) and the cylindrical through groove (5) are screwed together.

6. The novel airtight throttle valve according to claim 1, characterized in that: The valve stem (8) is connected to the actuator (21) via a coupling (20), and the actuator (21) is fixed to the valve body (1) via a mounting post (13).

7. The novel airtight throttle valve according to claim 6, characterized in that: The mounting column (13) and the valve body (1) adopt a triangular support structure.

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