A split needle valve with multiple seals

Abstract

The present invention proposes a split needle valve with multiple seals, including a valve body and a valve plug housing. The valve body is constructed with a valve cavity and a flow cavity. A valve core is provided in the valve cavity. The valve core is slidably arranged in a first accommodating cavity. An axial hole is provided in the middle of the valve plug housing. A guide shaft is provided on the top of the valve core. The guide shaft is slidably arranged in the axial hole. The valve stem is also provided. The valve stem is provided in the valve plug housing and is threadedly connected to the axial hole. The valve stem abuts against the guide shaft of the valve core. After the valve stem moves downward, it pushes the valve core to cut off the flow cavity. The split needle valve with multiple seals provided by the present invention is designed as a split structure. Through the design of the multi-channel sealing structure, the valve stem and other components can be replaced in the working state, and the sealing effect of the needle valve is improved. When used in the power system, it can improve the reliability of the connection between the pressure measuring element of the high-pressure system energy storage tank and its body, eliminate unplanned shutdowns caused by leakage of the meter valve of the energy storage tank body, and ensure the safety of power operation and national economic production.

Description

Technical Field

[0001] The invention belongs to the technical field of needle valves and relates to a split needle valve with multiple seals. Background Art

[0002] The hydraulic speed control system of a large and medium-sized hydropower station in China, its core energy storage system, the pressure oil tank assembly includes: the hydraulic system has two pressure tanks, each with a volume of 20m 3， One storage medium is compressed air, and the other is oil and compressed air. The upper parts of the two pressure tanks are connected by a pipeline. During the adjustment process of the pressure tanks, the consumed oil is replenished by the oil pump, and the consumed compressed air is replenished by the automatic air replenishment device. The pressure tanks are equipped with a safety valve, a visual liquid level gauge, four oil level switches, an oil level sensor, a pressure sensor and two pressure switches, an automatic air replenishment device, and a mechanical pressure gauge. All hydraulic components are equipped with needle valves or pressure gauge pre-valve valves. In particular, the needle valve pre-valve used on the pressure gauge of the oil tank body cannot be isolated separately.

[0003] In order to ensure the reliable operation of equipment, there are two common ways to ensure the reliability of equipment in existing technology: one is to use a double gauge front valve (one for use and one for backup); the other is to directly use a single needle valve as the isolation valve of the pressure gauge.

[0004] The first method has an additional valve, and the pipeline needs to be re-welded and reconfigured during the installation process. In essence, it only uses the valve stacking method to perform pressure isolation. In the second method, if the needle valve shaft seal leaks due to isolation operation and frequent use, the machine must be shut down, the pressure must be released, and the medium must be discharged before replacement. Summary of the Invention

[0005] The purpose of the present invention is to address the defects of the existing technology and provide a multi-seal split needle valve. The valve can fundamentally improve the reliability of the connection between the pressure measuring element of the energy storage tank of the medium and high pressure pressure vessel pressure system and its body in power production, eliminate unplanned shutdowns caused by leakage of the meter valve of the energy storage tank body, and ensure the safety of power operation and national economic production.

[0006] The technical objectives of the present invention are achieved through the following technical solutions: providing a multi-seal split needle valve, comprising a valve body and a valve plug housing, wherein the valve body is provided with a threaded connection hole, both ends of the valve plug housing are provided with external threads, the valve plug housing is threadedly connected to the valve body through the threaded connection hole, one end of the valve plug housing connected to the valve body is provided with a first accommodating cavity, and the other end of the valve plug housing is provided with a second accommodating cavity;

[0007] The valve body is constructed with a valve cavity and a flow cavity, a valve core is provided in the valve cavity, and the valve core is partially slidably arranged in the first accommodating cavity, an axial hole is provided in the middle of the valve plug housing, the upper section of the axial hole is set as a threaded hole, and the lower end of the axial hole is set as a smooth hole, a guide shaft is provided on the top of the valve core, and the guide shaft is partially slidably arranged in the axial hole;

[0008] It also includes a valve stem, which is arranged in the valve plug housing and is threadedly connected to the shaft hole. The valve stem abuts against the guide shaft of the valve core. After the valve stem moves downward, it pushes the valve core to cut off the flow chamber.

[0009] Preferably, it further comprises a valve cover, which is threadedly connected to the top end of the valve plug housing, and a valve shaft sealing material is provided between the valve cover and the valve plug housing, and the valve shaft sealing material is provided in the second accommodating cavity.

[0010] Preferably, a first sealing groove is provided on the outer peripheral surface of the valve core in contact with the first accommodating cavity, and a valve core radial sealing ring is provided in the first sealing groove.

[0011] Preferably, a second sealing groove is provided on the outer peripheral surface of the guide shaft in contact with the shaft hole, and a valve plug radial sealing ring is provided in the second sealing groove.

[0012] Preferably, a valve plug flat sealing piece is provided in the first accommodating cavity, and the valve plug flat sealing piece is arranged above the valve core.

[0013] Preferably, a boss is provided at the bottom end of the valve stem, and a ball is provided on the outer ring of the boss, and the ball is abutted between the valve stem and the guide shaft.

[0014] Preferably, the flow chamber is provided with an inlet and an outlet, the inlet is used for fluid to flow in, and the outlet is used for fluid to flow out.

[0015] Preferably, the valve body is provided with internal threaded holes at both ends of the flow chamber, the internal threaded holes are used to be connected to the fluid delivery system, and the inlet and outlet of the flow chamber are respectively connected to the two internal threaded holes.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention provides a split needle valve with multiple seals, which is designed as a split structure. Through the design of the multi-sealed structure, the valve can be manufactured in split parts, and the valve stem and other components can be replaced in the working state. The sealing effect of the needle valve is improved. When used in the power system, it can improve the reliability of the connection between the pressure measuring element of the high-pressure system energy storage tank and its body, eliminate unplanned shutdowns caused by leakage of the meter valve of the energy storage tank body, and ensure the safety of power operation and national economic production. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the three-dimensional structure of the invention.

[0019] Figure 2 It is a side view of the present invention.

[0020] Figure 3 for Figure 2 AA section view.

[0021] Figure 4 for Figure 3 Schematic diagram of the enlarged structure of part A in the middle.

[0022] Figure 5 Schematic diagram of the connection between the valve core and the valve stem in one embodiment of the present invention.

[0023] In the figure: 1. Valve body; 2. Valve plug housing; 3. First accommodating chamber; 4. Second accommodating chamber; 5. Valve chamber; 6. Flow chamber; 7. Valve core; 8. Shaft hole; 9. Guide shaft; 10. Valve stem; 11. Valve cover; 12. Valve shaft sealing material; 13. First sealing groove; 14. Valve core radial sealing ring; 15. Second sealing groove; 16. Valve plug radial sealing ring; 17. Valve plug flat sealing sheet; 18. Boss; 19. Ball; 20. Internal threaded hole. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the technical solution of the present invention, the preferred embodiments of the present invention are described below in conjunction with specific embodiments. However, it should be understood that the drawings are only for illustrative purposes and cannot be understood as limiting this patent; in order to better illustrate this embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted; the positional relationships described in the drawings are only for illustrative purposes and cannot be understood as limiting this patent.

[0025] As an embodiment of the present invention, see the attached Figure 1-Figure 3 This embodiment provides a multi-seal split needle valve, comprising a valve body 1 and a valve plug housing 2. The valve body 1 is provided with a threaded connection hole, and both ends of the valve plug housing 2 are provided with external threads. The valve plug housing 2 is threadedly connected to the valve body 1 through the threaded connection hole. The thread at the connection between the valve plug housing 2 and the valve body 1 adopts an NPT thread, which has a self-sealing function. The end of the valve plug housing 2 connected to the valve body 1 is provided with a first accommodating chamber 3, and the other end of the valve plug housing 2 is provided with a second accommodating chamber 4;

[0026] The valve body 1 is constructed with a valve cavity 5 and a flow cavity 6. A valve core 7 is provided in the valve cavity 5. The valve core 7 is partially slidably disposed in the first accommodating cavity 3. An axial hole 8 is provided in the middle of the valve plug housing 2. The upper section of the axial hole 8 is a threaded hole, and the lower end of the axial hole 8 is a smooth hole. A guide shaft 9 is provided on the top of the valve core 7. The guide shaft 9 is partially slidably disposed in the axial hole 8.

[0027] It also includes a valve stem 10, which is arranged in the valve plug housing 2 and is threadedly connected to the shaft hole 8. The valve stem 10 abuts against the guide shaft 9 of the valve core 7. After the valve stem 10 moves downward, it pushes the valve core 7 to cut off the flow chamber 6.

[0028] The valve body 1 and the valve plug housing 2 of the above embodiment are threadedly connected, which can realize split manufacturing. At the same time, the valve core 7 and the valve stem 10 are also split structures, which can fully realize the split manufacturing of the valve body and the split manufacturing of the traditional valve stem. The valve core is then limited in the first accommodating chamber 3 through the threaded connection between the valve body 1 and the valve plug housing 2, thereby improving manufacturing efficiency and making it easier to assemble.

[0029] In some embodiments, please see the attached Figure 2 and attached Figure 3 , and also includes a valve cover 11, which is threadedly connected to the top end of the valve plug housing 2, and a valve shaft sealing material 12 is provided between the valve cover 11 and the valve plug housing 2, and the valve shaft sealing material 12 is provided in the second accommodating chamber 4.

[0030] In some preferred embodiments, see the attached Figure 4 In this embodiment, a first sealing groove 13 is provided on the outer peripheral surface of the valve core 7 in contact with the first accommodating cavity 3, and a valve core radial sealing ring 14 is provided in the first sealing groove 13.

[0031] In some preferred embodiments, see the attached Figure 4 In this embodiment, a second sealing groove 15 is provided on the outer circumferential surface of the guide shaft 9 in contact with the shaft hole 8, and a valve plug radial sealing ring 16 is disposed in the second sealing groove 15. It should be understood that this embodiment can be combined with any of the preceding embodiments. For example, in this embodiment, a first sealing groove 13 is further provided on the outer circumferential surface of the valve core 7 in contact with the first accommodating cavity 3, and a valve core radial sealing ring 14 is disposed in the first sealing groove 13, thereby achieving multi-pass radial sealing.

[0032] In some preferred embodiments, see the attached Figure 4 In this embodiment, a valve plug flat sealing piece 17 is provided in the first accommodating chamber 3. The valve plug flat sealing piece 17 is arranged above the valve core 7. The valve plug flat sealing piece 17 is made of polyether polyurethane material to achieve good oil resistance and wear resistance.

[0033] In some preferred embodiments, see the attached Figure 5 A boss 18 is provided at the bottom end of the valve stem 10, and a ball 19 is provided on the outer ring of the boss 18. The ball 19 is abutted between the valve stem 10 and the guide shaft 9. After adding the ball 19, on the one hand, the wear of the valve stem and the guide shaft can be reduced, and the frequency of replacing the valve stem can be reduced. At the same time, it also makes the valve more labor-saving during operation.

[0034] It can be understood that the needle valve of the present invention is used for fluid system control, wherein the flow chamber 6 is provided with an inlet and an outlet, the inlet is used for fluid to flow in, and the outlet is used for fluid to flow out.

[0035] As a general rule, in order to facilitate the quick connection and installation of the needle valve of the present invention with the fluid system, the valve body 1 in this embodiment is provided with internal threaded holes 20 at both ends of the flow chamber 6. The internal threaded holes 20 are used to connect with the fluid delivery system, and the inlet and outlet of the flow chamber 6 are respectively connected to the two internal threaded holes 20.

[0036] During the use of the above preferred embodiment, when the valve is closed, the valve stem is rotated, and the valve stem pushes the valve core downward. At this time, the valve is sealed with the valve core and the valve cavity to effectively block the fluid pressure. Figure 3 As shown, the normal closing function of the needle valve is now achieved. During the opening process of the valve, when the valve stem is rotated, the valve core moves upward under the pressure of the fluid to press the valve plug flat sealing sheet 17. At the same time, under the sealing action of the valve core radial sealing ring 14, the valve plug radial sealing ring 15 and the valve shaft sealing material 12, multiple seals are achieved in the open state, achieving zero leakage. At the same time, in extreme cases, if there is slight leakage on the upper valve shaft, the sealing force of the valve shaft can be increased by tightening the valve cover 11, thus achieving a quadruple seal of the operating mechanism.

[0037] In addition to its sealing function, during valve maintenance, the valve stem can be replaced and removed while the valve is open. Under the sealing action of the valve core radial sealing ring 14, the valve plug radial sealing ring 15 and the valve plug flat sealing sheet 17, the overall sealing effect of the valve core will not be affected.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limiting. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A split needle valve with multiple seals, characterized by: The invention comprises a valve body (1) and a valve plug housing (2), wherein the valve body (1) is provided with a threaded connection hole, and both ends of the valve plug housing (2) are provided with external threads, and the valve plug housing (2) is threadedly connected to the valve body (1) through the threaded connection hole, and one end of the valve plug housing (2) connected to the valve body (1) is provided with a first accommodating cavity (3), and the other end of the valve plug housing (2) is provided with a second accommodating cavity (4); The valve body (1) is constructed with a valve cavity (5) and a flow cavity (6), a valve core (7) is provided in the valve cavity (5), and the valve core (7) is partially slidably arranged in the first accommodating cavity (3), an axial hole (8) is provided in the middle of the valve plug housing (2), the upper section of the axial hole (8) is set as a threaded hole, and the lower end of the axial hole (8) is set as a light hole, and a guide shaft (9) is provided on the top of the valve core (7), and the guide shaft (9) is partially slidably arranged in the axial hole (8); It also includes a valve stem (10), the valve stem (10) being arranged in the valve plug housing (2) and being threadedly connected to the shaft hole (8), the valve stem (10) being in contact with the guide shaft (9) of the valve core (7), and when the valve stem (10) moves downward, it pushes the valve core (7) to cut off the flow chamber (6); It also includes a valve cover (11), the valve cover (11) is threadedly connected to the top end of the valve plug housing (2), a valve shaft sealing material (12) is provided between the valve cover (11) and the valve plug housing (2), and the valve shaft sealing material (12) is provided in the second accommodating cavity (4); A first sealing groove (13) is provided on the outer peripheral surface of the valve core (7) in contact with the first accommodating cavity (3), and a valve core radial sealing ring (14) is provided in the first sealing groove (13); A second sealing groove (15) is provided on the outer peripheral surface of the guide shaft (9) in contact with the shaft hole (8), and a valve plug radial sealing ring (16) is provided in the second sealing groove (15); A valve plug plane sealing sheet (17) is provided in the first accommodating cavity (3), and the valve plug plane sealing sheet (17) is arranged above the valve core (7).

2. A multi-seal split needle valve according to claim 1, characterized in that: A boss (18) is provided at the bottom end of the valve stem (10), and a ball (19) is provided on the outer ring of the boss (18). The ball (19) is abutted between the valve stem (10) and the guide shaft (9).

3. The multi-seal split needle valve according to claim 1, characterized in that: The flow chamber (6) is provided with an inlet and an outlet, the inlet is used for the inflow of fluid, and the outlet is used for the outflow of fluid.

4. A multi-seal split needle valve according to claim 3, characterized in that: The valve body (1) is provided with internal threaded holes (20) at both ends of the flow cavity (6), and the internal threaded holes (20) are used to connect to a fluid delivery system, and the inlet and outlet of the flow cavity (6) are respectively connected to the two internal threaded holes (20).

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