Three-bearing double-lip-shaped sealing valve rod

Abstract

The utility model discloses a three-bearing double-lip-shaped sealing valve rod, and belongs to the technical field of valves. The sealing structure comprises a valve rod, a gland flange and a top flange, the top flange is arranged at the top of the valve rod in a sleeving mode, a first transmission structure is arranged between the top flange and the valve rod, the gland flange is arranged on the valve rod in a sleeving mode, and a first lip-shaped sealing ring is arranged on the upper portion between the valve rod and the gland flange. A second lip-shaped sealing ring and a second transmission structure are arranged in the middle of the position between the valve rod and the gland flange, a third transmission structure is arranged on the lower portion of the position between the valve rod and the gland flange, and a pressing sleeve is arranged among the gland, the valve rod and the top flange. The valve rod and the gland flange are provided with multiple seals, so that no leakage is effectively ensured, the sealing performance is good, and the later maintenance cost of the valve is reduced.

Description

Technical Field

[0001] This utility model relates to a three-bearing double-lip sealing valve stem, belonging to the field of valve technology. Background Technology

[0002] With industrial development, the application of valves is becoming increasingly widespread, and the requirements for valves are also becoming more stringent. As a crucial component for valve opening and closing, the valve stem faces increasingly stringent requirements in all aspects. During valve opening and closing, the valve stem is not only a moving and load-bearing part but also a sealing element. Simultaneously, it is subjected to the impact and corrosion of the medium and friction with the packing. Due to issues during valve stem machining, problems such as inaccurate thread precision, easily damaged rolling dies, poor concentricity, and easy deformation and twisting can easily occur, leading to sealing surface seizure and medium leakage. This not only reduces the valve's service life and causes frequent and costly maintenance but also poses serious consequences to the surrounding environment and personal safety. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the existing technology and provide a three-bearing double-lip sealing valve stem, which improves its sealing performance, extends the service life of the sealing element, and ensures stable valve operation.

[0004] To achieve the above objectives / to solve the above technical problems, this utility model adopts the following technical solution:

[0005] A three-bearing double-lip sealing valve stem is characterized by comprising a valve stem, a gland flange, and a top flange. The top flange is fitted onto the top of the valve stem, and a first transmission structure is provided between the two. The gland flange is fitted onto the valve stem. A first lip seal ring is provided at the upper part between the valve stem and the gland flange. A second lip seal ring and a second transmission structure are provided at the middle part between the valve stem and the gland flange. A third transmission structure is provided at the lower part between the valve stem and the gland flange. A pressure sleeve is provided between the gland, the valve stem, and the top flange.

[0006] Optionally, the gland flange and the top flange are connected by a fixing device.

[0007] Optionally, the fixing device is a stud nut.

[0008] Optionally, a gap is pre-set between the valve stem and the gland flange.

[0009] Optionally, the valve stem extends through the gland flange and the top flange.

[0010] Optionally, the first transmission structure is a first bearing.

[0011] Optionally, the second transmission structure is a second bearing.

[0012] Optionally, the third transmission structure is a third bearing.

[0013] Compared with the prior art, the beneficial effects achieved by this utility model are as follows:

[0014] The valve stem and the gland flange of this utility model have a gap and do not contact each other, which effectively prevents seizing, improves the sealing effect, extends the service life of the sealing components, and ensures stable valve operation.

[0015] The multi-bearing design ensures the coaxiality of the valve stem during rotation, protects the lip seal, improves its sealing performance, extends the service life of the seals, and ensures stable valve operation.

[0016] The valve stem and gland flange are equipped with multiple seals, which effectively ensures no external leakage, good sealing performance, and reduces the valve's later maintenance costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a three-bearing double-lip sealing valve stem according to the present invention;

[0018] In the diagram: 1-valve stem, 2-gland flange, 3-top flange, 4-pressure sleeve, 5-lip seal ring one, 6-lip seal ring two, 7-first bearing, 8-second bearing, 9-third bearing. Detailed Implementation

[0019] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0020] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0021] refer to Figure 1This utility model discloses a valve stem with a three-bearing double-lip seal, including a valve stem 1, a gland flange 2, a top flange 3, a pressure sleeve 4, a first lip seal ring 5, a second lip seal ring 6, a first bearing 7, a second bearing 8, and a third bearing 9. The gland flange 2 and the top flange 3 are fixedly connected by studs and nuts, and the valve stem 1 passes through the gland flange 2 and the top flange 3.

[0022] There is a gap between the valve stem 1 and the gland flange 2, so they do not contact each other, which effectively prevents seizing, improves the sealing effect, extends the service life of the sealing components, and ensures stable valve operation.

[0023] In this embodiment, the valve stem 1 and the gland flange 2 are fitted with a lip seal 5, a bearing 7, a pressure sleeve 4, a second lip seal 6, and a second bearing 8, forming a combined sealing structure.

[0024] In this embodiment, the top flange 3 is sleeved on the top of the valve stem 1, and a first transmission structure is provided between the two. The gland flange is sleeved on the valve stem. A lip seal ring 5 is provided at the upper part between the valve stem and the gland flange. A second lip seal ring 6 and a second transmission structure are provided at the middle part between the valve stem and the gland flange. A third transmission structure is provided at the lower part between the valve stem and the gland flange. The first transmission structure, the second transmission structure and the third transmission structure are bearings. A multi-bearing design is adopted to ensure the coaxiality of the valve stem 1 when it rotates, protect the first lip seal ring 5 and the second lip seal ring 6, improve their sealing performance, extend the service life of the sealing components, and ensure stable valve operation.

[0025] The valve stem 1 and the gland flange 2 are equipped with lip seal ring 1 5 and lip seal ring 2 6, which effectively ensures no external leakage, good sealing performance, and reduces the valve's later maintenance costs;

[0026] The valve stem 1 and the gland flange 2 of this utility model have a gap and do not contact each other, which effectively prevents biting, improves the sealing effect, extends the service life of the sealing components, and ensures stable valve operation.

[0027] The multi-bearing design ensures the coaxiality of the valve stem during rotation, protects the lip seal, improves its sealing performance, extends the service life of the seals, and ensures stable valve operation.

[0028] The valve stem and gland flange are equipped with multiple seals, which effectively ensures no external leakage, good sealing performance, and reduces the valve's later maintenance costs.

[0029] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A three-bearing double-lip sealing valve stem, characterized in that, The valve includes a valve stem, a gland flange, and a top flange. The top flange is fitted onto the top of the valve stem, and a first transmission structure is provided between the two. The gland flange is fitted onto the valve stem. A lip seal ring is provided at the upper part between the valve stem and the gland flange. A second lip seal ring and a second transmission structure are provided at the middle part between the valve stem and the gland flange. A third transmission structure is provided at the lower part between the valve stem and the gland flange. A pressure sleeve is provided between the gland, the valve stem, and the top flange.

2. The three-bearing double-lip sealing valve stem according to claim 1, characterized in that, The gland flange and the top flange are connected by a fixing device.

3. The three-bearing double-lip sealing valve stem according to claim 2, characterized in that, The fixing device uses studs and nuts.

4. The three-bearing double-lip sealing valve stem according to claim 1, characterized in that, A gap is pre-set between the valve stem and the gland flange.

5. The three-bearing double-lip sealing valve stem according to claim 1, characterized in that, The valve stem passes through the gland flange and the top flange.

6. The three-bearing double-lip sealing valve stem according to claim 1, characterized in that, The first transmission structure is the first bearing.

7. The three-bearing double-lip sealing valve stem according to claim 1, characterized in that, The second transmission structure is the second bearing.

8. The three-bearing double-lip sealing valve stem according to claim 1, characterized in that, The third transmission structure is a third bearing.

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