Lining butterfly valve

Abstract

The lining butterfly valve is characterized by further comprising a steel belt which is arranged between the lining and the inner side wall of the flow channel, the steel belt is arranged around the lining, one end of the steel belt is fixed relative to the valve body, and the other end of the steel belt extends out of the valve body and is connected with a driving shaft. The utility model has the advantages that the operation is easy, the service life is prolonged, and the reliable sealing performance is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a lined butterfly valve. Background Art

[0002] A butterfly valve is a valve whose closing disc is a disc that rotates around the valve shaft to open and close. It is mainly used for cutting off and throttling in pipelines and is widely used in large-scale water supply and drainage projects, seawater, sewage treatment, fresh water, gas and other pipelines. The opening and closing part of a butterfly valve is a disc-shaped valve plate that rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulating.

[0003] Lined butterfly valve adopts lining technology to form a layer of lining on the inner wall of the flow channel of the valve body. The lining material is fluoroplastics such as FEP (F46) and PCTFE (F3), which can be applied to various concentrations of sulfuric acid, hydrochloric acid, hydrofluoric acid, aqua regia and various organic acids and strong acids.

[0004] However, the butterfly plate and the lining of this type of lined butterfly valve usually use interference fit to achieve forced sealing, which leads to relatively large friction between the butterfly plate and the lining during the opening and closing of the valve. This not only leads to a relatively large torque required for opening and closing the valve, making the operation more laborious, but also causes greater wear between the lining and the butterfly plate, resulting in a short service life. Utility Model Content

[0005] In order to overcome the deficiencies of the background technology, the utility model provides a lined butterfly valve.

[0006] The technical solution adopted by the utility model is: a lined butterfly valve, comprising:

[0007] A valve body, which is provided with a flow channel, and the inner side wall of the flow channel is provided with an inner lining;

[0008] a valve stem, which is mounted on the valve body;

[0009] A butterfly plate is arranged in the flow passage of the valve body and mounted on the valve stem;

[0010] The steel belt is arranged between the inner liner and the inner wall of the flow channel, and the steel belt is arranged around the inner liner. One end of the steel belt is fixed relative to the valve body, and the other end extends out of the valve body and is connected to the drive shaft.

[0011] An annular groove is formed on the inner wall of the flow channel of the valve body, and the steel belt is embedded in the annular groove.

[0012] The steel belts are provided with two.

[0013] One end of the driving shaft is connected to a high-speed ratio reducer.

[0014] Both ends of the valve body are connected with pipeline flanges, and the valve body and the pipeline flanges clamp the two ends of the liner.

[0015] Annular clamping grooves are formed on the end surfaces at both ends of the valve body, and annular clamping platforms are correspondingly formed at both ends of the liner, and the annular clamping platforms are clamped with the annular clamping grooves.

[0016] The beneficial effect of the utility model is as follows: by adopting the above scheme, a steel belt is added surrounding the lining. When the valve is opened and closed, the steel belt is loose, and there is no friction between the butterfly plate and the lining. Not only is the operation easy, but also there is no wear, thereby increasing the service life. When the valve is closed and needs to be sealed, the rotating drive shaft is rotated, and the rotating shaft drives the steel belt to be tightened, and the steel belt presses the lining, so that the lining and the butterfly plate fit closely to form a forced seal, thereby ensuring reliable sealing performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the transverse cross-sectional structure of the lined butterfly valve according to an embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of the longitudinal cross-sectional structure of the lined butterfly valve according to an embodiment of the utility model.

[0019] Figure 3 for Figure 2 A magnified schematic diagram of center A. DETAILED DESCRIPTION

[0020] The embodiments of the utility model are further described below in conjunction with the accompanying drawings.

[0021] like Figure 1-3 As shown, a lined butterfly valve includes a valve body 1, a valve stem 3, a butterfly plate 4, and a steel belt 5.

[0022] The valve body 1 is provided with a flow channel 11 for medium circulation, and the inner side wall of the flow channel 11 is provided with a lining 2. The valve stem 3 is installed on the valve body 1. The butterfly plate 4 is arranged in the flow channel 11 of the valve body 1 and is installed on the valve stem 3. By driving the valve stem 3 to rotate, the butterfly plate 4 can be driven to rotate, thereby realizing the valve opening and closing operation.

[0023] The steel belt 5 is a stainless steel belt, which is arranged between the inner liner 2 and the inner wall of the flow channel 11, and the steel belt 5 is arranged around the inner liner 2. Both ends of the steel belt 5 extend out of the valve body 1, one end of which is fixedly connected to the valve body 1, and the other end is connected to the drive shaft 6. By rotating the drive shaft 6, the steel belt 5 can be tightened, and the steel belt 5 will appropriately reduce the inner diameter of the surrounding area, thereby tightening the inner liner 2 inward. Among them, the drive shaft 6 is connected to a large speed ratio reducer 7 fixed on the valve body, and the operation of rotating the drive shaft 6 is easier. The large speed ratio reducer 7 is preferably a worm gear reducer, which not only has a large reduction ratio, but also has a self-locking function, which can keep the steel belt 5 in the tightened position.

[0024] The above-mentioned lined butterfly valve has two application modes.

[0025] The first application method is to use the tightened steel belt as the main sealing method.

[0026] When the valve is opened or closed, the steel belt 5 is first kept in a relaxed state, and there is little or no friction between the butterfly plate 4 and the lining 2. At this time, not only is the operation easy, but there is also little or no wear, which greatly improves the service life of the valve. When the valve is closed and needs to be sealed, the drive shaft 6 is rotated, and the rotating shaft 6 drives the steel belt 5 to be tightened, and the steel belt 5 presses the lining 2 to tighten the lining 2 inward, so that the lining 2 and the butterfly plate 4 can fit tightly to form a forced seal, thereby ensuring reliable sealing performance.

[0027] The second application method is to compensate for the wear of the liner 2 by tightening the steel belt to improve the sealing performance.

[0028] When the valve is opened and closed, the butterfly plate 4 and the lining 2 maintain normal friction contact, and the interference fit between the two is used to achieve forced sealing. When the sealing surface of the lining 2 is worn to a certain extent, the steel belt 5 is properly tightened, and the surrounding diameter of the steel belt 5 is appropriately reduced, so that the lining 2 shrinks inward, compensating for the wear of the lining 2, increasing its service life, and ensuring reliable sealing.

[0029] In addition, an annular groove 12 is formed on the inner wall of the flow channel 11 of the valve body 1, and the steel belt 4 is embedded in the annular groove 12. By embedding the steel belt 5 in the annular groove 12, it is ensured that the lining is straight and has no bulges when the steel belt 5 is in a relaxed state.

[0030] The steel strips 5 are provided with two strips, so that the liner 2 can squeeze and seal the two sides of the butterfly plate 4, further improving the sealing effect.

[0031] Annular grooves 13 are formed on the end faces of both ends of the valve body 1, and annular clamping platforms 21 are correspondingly formed at both ends of the liner 2. The annular clamping platforms 21 are clamped with the annular grooves 13, and pipeline flanges 8 are connected to both ends of the valve body 1. The valve body 1 and the pipeline flange 8 clamp the two ends of the liner 2 to ensure that the connection between the liner 2 and the valve body 1 is stable when the steel belt 5 pulls the liner 2 inward, and the structure is more stable and reliable.

[0032] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships described in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, 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 cannot be understood as a limitation on the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. In addition, in the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0034] Technical personnel should note: Although the utility model has been described according to the above specific implementation methods, the utility model concept of the utility model is not limited to this utility model. Any modification using the utility model concept will be included in the scope of protection of this patent right.

Claims

1. A lined butterfly valve, comprising: A valve body (1) is provided with a flow channel (11), wherein the inner side wall of the flow channel (11) is provided with an inner lining (2); A valve stem (3) mounted on the valve body (1); A butterfly plate (4) is arranged in a flow passage (11) of the valve body (1) and mounted on the valve stem (3); The valve body (1) is characterized in that it further comprises a steel belt (5) which is arranged between the inner liner (2) and the inner side wall of the flow channel (11), and the steel belt (5) is arranged around the inner liner (2), one end of the steel belt (5) is fixed relative to the valve body (1), and the other end extends out of the valve body (1) and is connected to the drive shaft (6).

2. The lined butterfly valve according to claim 1, characterized in that: An annular groove (12) is formed on the inner wall of the flow channel (11) of the valve body (1), and the steel belt (5) is embedded in the annular groove (12).

3. The lined butterfly valve according to claim 1, characterized in that: The steel belts (5) are provided with two strips.

4. The lined butterfly valve according to claim 1, characterized in that: One end of the drive shaft (6) is connected to a high-speed ratio reducer (7).

5. The lined butterfly valve according to claim 1, characterized in that: Both ends of the valve body (1) are connected to pipeline flanges (8), and the valve body (1) and the pipeline flanges (8) clamp the two ends of the liner (2).

6. The lined butterfly valve according to claim 5, characterized in that: Annular clamping grooves (13) are formed on the end surfaces at both ends of the valve body (1), and annular clamping platforms (21) are correspondingly formed at both ends of the liner (2), and the annular clamping platforms (21) are clamped with the annular clamping grooves (13).

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