Throttle valve rod packing structure

Abstract

The utility model discloses a throttle valve rod packing structure which comprises a valve rod, a sealing ring, a support, a sealing gasket, V-shaped packing, sealing packing, a valve cover and a supporting ring, the valve rod is movably installed in the center of the support and the valve cover, and the V-shaped packing, the sealing packing and the supporting ring are sequentially installed in the valve cover and located on the outer ring of the valve rod from top to bottom. A sealing ring is arranged on the outer ring of the valve rod in the bracket; and a sealing gasket is arranged between the bracket and the valve cover. The sealing position of the valve rod is locally improved, a set of polytetrafluoroethylene V-shaped packing is added on the basis of the multi-lip type sealing packing, a double-sealing structure is achieved at the same time, the requirement for corrosion resistance can be met, meanwhile, low leakage can be guaranteed after multiple times of opening and closing can be achieved, the structure is simple and reasonable, and use is convenient. The sealing effect is good, manufacturing cost is low, and practicability is high.

Description

Technical Field

[0001] The utility model relates to a valve stem packing structure, in particular to a throttle valve stem packing structure. Background Art

[0002] As a kind of control valve, throttle valve is widely used in oil wells for petroleum extraction. Usually, the oil well medium contains a large amount of corrosive gas, so the valve usually adopts lip seal packing made of corrosion-resistant polytetrafluoroethylene + Egiloy spring material; at the same time, it is also necessary to meet the low leakage requirement. The valve stem seal adopts multi-lip seal packing, but after multiple switches, it will be found that the lip edge of the packing is worn, especially for high-pressure valves, which makes it impossible to meet the low leakage requirement. For this reason, we propose a throttle valve stem packing structure. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide a throttle valve stem packing structure, which solves the problem that the existing valve stem seal adopts a multi-lip sealing packing, but after repeated switching, it is found that the lip edge of the packing is worn, especially for high-pressure valves, which makes it impossible to meet the low leakage requirement.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: a throttle valve stem packing structure, including a valve stem, a sealing ring, a bracket, a sealing gasket, a V-shaped packing, a sealing packing, a valve cover and a support ring, the valve stem is movably installed in the center of the bracket and the valve cover, the outer ring of the valve stem in the valve cover is sequentially installed with a V-shaped packing, a sealing packing and a support ring from top to bottom, the outer ring of the valve stem in the bracket is installed with a sealing ring, and a sealing gasket is installed between the bracket and the valve cover.

[0005] Based on the above solution, the sealing ring is an O-ring and is made of rubber material.

[0006] Based on the above solution, the sealing gasket is a graphite wound gasket.

[0007] Based on the above solution, the V-shaped filler is a polytetrafluoroethylene V-shaped filler.

[0008] Based on the above solution, the sealing filler is a multi-lip sealing filler.

[0009] Compared with the prior art, the utility model has the following beneficial effects: a throttle valve stem packing structure, in which the valve stem seal is partially improved, and a group of polytetrafluoroethylene V-shaped packing is added on the basis of the multi-lip sealing packing, thereby realizing a double sealing structure, which can not only meet the corrosion resistance requirements, but also meet the problem of ensuring low leakage after multiple switches. The utility model has a simple and reasonable structure, good sealing effect, low production cost and strong practicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a structural schematic diagram of a throttle valve stem packing structure of the utility model;

[0011] Figure 2 For this utility model Figure 1 Schematic diagram of the partially enlarged structure.

[0012] The numbers in the figure are: 1-valve stem, 2-sealing ring, 3-bracket, 4-sealing gasket, 5-V-shaped packing, 6-sealing packing, 7-valve cover, 8-support ring. DETAILED DESCRIPTION

[0013] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0014] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0015] Reference Figure 1 to Figure 2 It can be seen that: a throttle valve stem packing structure includes a valve stem 1, a sealing ring 2, a bracket 3, a sealing gasket 4, a V-shaped packing 5, a sealing packing 6, a valve cover 7 and a support ring 8, the valve stem 1 is movably installed in the center of the bracket 3 and the valve cover 7, the outer ring of the valve stem 1 in the valve cover 7 is sequentially installed with a V-shaped packing 5, a sealing packing 6 and a support ring 8 from top to bottom, the outer ring of the valve stem 1 in the bracket 3 is installed with a sealing ring 2, and a sealing gasket 4 is installed between the bracket 3 and the valve cover 7.

[0016] The sealing ring 2 is an O-ring and is made of rubber material. The rubber material has good elasticity and good sealing performance. The sealing gasket 4 is a graphite wound gasket. The graphite material is resistant to high temperature and has good sealing performance. The V-shaped filler 5 is a polytetrafluoroethylene V-shaped filler. The polytetrafluoroethylene V-shaped filler has good high temperature resistance. At the same time, the V-shaped filler 5 has good sealing performance after compression. The sealing filler 6 is a multi-lip sealing filler. The sealing filler 6 and the V-shaped filler 5 cooperate with each other and have a double sealing function.

[0017] The principles and advantages of the utility model: a throttle valve stem packing structure adopts a new structure, locally improves the sealing part of the valve stem 1, and adds a group of polytetrafluoroethylene V-shaped packing 5 on the basis of the multi-lip sealing packing 6, thereby realizing a double sealing structure, which can not only meet the corrosion resistance requirements, but also meet the problem of ensuring low leakage after multiple switches. The valve seal has excellent low leakage performance and can still meet the low leakage performance requirements after multiple switching cycles. The utility model has a simple and reasonable structure, good sealing effect, low production cost, and is suitable for popularization and use.

[0018] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A throttle valve stem packing structure, comprising a valve stem (1), a sealing ring (2), a bracket (3), a sealing gasket (4), a V-shaped packing (5), a sealing packing (6), a valve cover (7) and a support ring (8), characterized in that: The valve stem (1) is movably mounted at the center of the bracket (3) and the valve cover (7); a V-shaped packing (5), a sealing packing (6) and a support ring (8) are installed in sequence from top to bottom on the outer ring of the valve stem (1) in the valve cover (7); a sealing ring (2) is installed on the outer ring of the valve stem (1) in the bracket (3); and a sealing gasket (4) is installed between the bracket (3) and the valve cover (7).

2. A throttle valve stem packing structure according to claim 1, characterized in that: The sealing ring (2) is an O-type sealing ring and is made of rubber material.

3. A throttle valve stem packing structure according to claim 1, characterized in that: The sealing gasket (4) is a graphite wound gasket.

4. A throttle valve stem packing structure according to claim 1, characterized in that: The V-shaped filler (5) is a polytetrafluoroethylene V-shaped filler.

5. A throttle valve stem packing structure according to claim 1, characterized in that: The sealing filler (6) is a multi-lip sealing filler.

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