High-sealing-performance butterfly valve suitable for multiple working conditions

Abstract

The utility model provides a high sealing butterfly valve suitable for multiple working conditions, which comprises a valve body, a butterfly plate is rotatably mounted in the valve body, a valve rod is rotatably mounted in a valve rod seat of the valve body, and the valve rod is fixedly connected with the butterfly plate; by means of the integral arrangement, multiple sealing effects can be achieved, when the lower padding is not tightly sealed, leaked media can apply pressure to the middle padding, the conical padding is forced to enter the conical cavity, the larger the pressure of the media is, the tighter the conical padding, the conical cavity and the valve rod is, and therefore the media are prevented from leaking; when the conical packing is not tightly sealed, leaked media can enter the annular cavity to force the upper packing to expand, the larger the pressure of the media is, the larger the expansion of the upper packing is, and the tighter the upper packing, the valve rod cavity and the valve rod is, so that the media are prevented from leaking.

Description

Technical Field

[0001] The utility model relates to the field of butterfly valves, and in particular to a high-sealing butterfly valve suitable for multiple working conditions. Background Art

[0002] Butterfly valve is a commonly used valve type. Its closing part (valve disc or butterfly plate) is disc-shaped and rotates around the valve shaft to open and close. Butterfly valves mainly play the role of cutting off and throttling in pipelines. Its full opening to full closing is usually less than 90°. Due to its simple structure, small size, light weight and easy operation, butterfly valves are widely used in control systems in industries such as petroleum, chemical industry, metallurgy, water treatment, electricity, and heat.

[0003] However, the existing butterfly valve may be easily leaked due to poor sealing at the packing during long-term use.

[0004] Therefore, it is very necessary to invent a high-sealing butterfly valve suitable for multiple working conditions. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a technical solution for a high-sealing butterfly valve applicable to multiple working conditions: a high-sealing butterfly valve applicable to multiple working conditions, comprising a valve body, wherein: a butterfly plate is rotatably mounted in the valve body, and a valve stem is rotatably mounted in a valve stem seat of the valve body, and the valve stem is fixedly connected to the butterfly plate;

[0006] Preferably, an upper packing, a middle packing and a lower packing are sequentially arranged between the valve stem and the valve stem seat from top to bottom, and a packing gland is arranged between the valve stem and the valve stem seat; the packing gland is fixedly connected to the valve stem seat, and the packing gland is rotatably connected to the valve stem;

[0007] Preferably, a valve stem cavity is formed through the valve stem seat, and a conical cavity and a limit cavity are formed in the valve stem seat, and the conical cavity is above the limit cavity; the valve stem cavity, the conical cavity and the limit cavity are connected, and the valve stem cavity, the conical cavity and the limit cavity are coaxial;

[0008] Preferably, the valve stem, the upper packing and the lower packing are rotatably installed in the valve stem cavity; the intermediate packing is rotatably and elastically slidably installed in the conical cavity and the limit cavity; the packing gland is fixedly installed in the valve stem cavity;

[0009] Preferably, the intermediate filler comprises a conical filler, and a circular filler is provided at the bottom of the conical filler;

[0010] Preferably, the conical filler and the circular filler are sleeved on the valve stem, and the conical filler and the circular filler are slidably connected between the valve stem;

[0011] Preferably, the conical filler and the circular filler are slidably installed in the conical cavity and the limiting cavity, and the cone head of the conical filler is located in the conical cavity.

[0012] Preferably, an integrated bellows sleeve is provided at the bottom of the circular filler, and the bellows sleeve is elastically and slidably sleeved on the valve stem; an integrated nut is provided at the bottom of the bellows sleeve, and the nut and the valve stem are fixedly connected by threads.

[0013] Preferably, the outer surface of the valve stem is evenly distributed with upper threads, middle threads and lower threads from top to bottom; the upper filler is fixedly connected to the upper threads; the nut is fixedly connected to the middle threads; and the lower filler is fixedly connected to the lower threads.

[0014] Preferably, an annular cavity is provided at the bottom of the upper filler.

[0015] Compared with the prior art, the advantages of the utility model are:

[0016] The utility model can have multiple sealing effects through the overall arrangement. When the lower packing is not tightly sealed, the leaked medium will put pressure on the middle packing, forcing the conical packing to enter the conical cavity. The greater the medium pressure, the tighter the conical packing, the conical cavity and the valve stem are, thereby preventing medium leakage; when the conical packing is not tightly sealed, the leaked medium will enter the annular cavity, forcing the upper packing to expand. The greater the medium pressure, the greater the expansion of the upper packing, the tighter the upper packing, the valve stem cavity and the valve stem are, thereby preventing medium leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0018] Figure 2 It is a partial cutaway structural schematic diagram of the utility model.

[0019] Figure 3 It is a schematic diagram of the explosion structure of the valve stem, upper packing, conical packing, round packing and lower packing of the utility model.

[0020] Figure 4 It is a schematic diagram of the internal structure of the valve stem seat of the utility model.

[0021] Figure 5 It is a partial enlarged structural schematic diagram of point A of the utility model.

[0022] In the figure:

[0023] Valve body 1, valve stem seat 2, valve stem cavity 21, tapered cavity 22, limit cavity 23, butterfly plate 3, valve stem 4, upper thread 41, middle thread 42, lower thread 43, upper packing 5, ring cavity 6, tapered packing 7, round packing 8, corrugated sleeve 9, nut 10, lower packing 11, packing gland 12. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be described clearly and completely below. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0025] In the description of the embodiments, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "two ends", "one end", "the other end" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, which are only for the convenience of describing the utility model 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 utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. In the description of the utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" 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 an indirect connection through an intermediate medium, or it can be a connection between the two elements. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to specific circumstances.

[0026] The utility model is further described below in conjunction with the accompanying drawings:

[0027] Embodiment 1

[0028] Reference Figure 1-5 A high-sealing butterfly valve applicable to multiple working conditions comprises a valve body 1, wherein: a butterfly plate 3 is rotatably mounted in the valve body 1, and a valve stem 4 is rotatably mounted in a valve stem seat 2 of the valve body 1, and the valve stem 4 is fixedly connected to the butterfly plate 3;

[0029] A packing gland 12, an upper packing 5, an intermediate packing and a lower packing 11 are sequentially arranged between the valve stem 4 and the valve stem seat 2 from top to bottom. The upper packing 5, the intermediate packing and the lower packing 11 are arranged to improve the sealing performance between the valve stem 4 and the valve stem seat 2. The packing gland 12 is arranged to limit the upper packing 5, the intermediate packing and the lower packing 11 and ensure the stability of the upper packing 5, the intermediate packing and the lower packing 11. The packing gland 12 is fixedly connected to the valve stem seat 2, and the packing gland 12 is rotatably connected to the valve stem 4.

[0030] A valve stem cavity 21 is provided through the valve stem seat 2, and a conical cavity 22 and a limiting cavity 23 are provided in the valve stem seat 2. The setting of the conical cavity 22 and the limiting cavity 23 can not only provide displacement space for the intermediate packing, but also prevent friction between the conical packing 7 and the conical cavity 22 when the intermediate packing rotates with the valve stem 4, thereby avoiding wear of the conical packing 7. The conical cavity 22 is above the limiting cavity 23; the valve stem cavity 21, the conical cavity 22 and the limiting cavity 23 are connected, and the valve stem cavity 21, the conical cavity 22 and the limiting cavity 23 are coaxial; the valve stem 4, the upper packing 5 and the lower packing 11 are rotatably installed in the valve stem cavity 21; the intermediate packing is rotatably and elastically slidably installed in the conical cavity 22 and the limiting cavity 23;

[0031] The middle packing includes a conical packing 7. Through the setting of the conical packing 7, when the lower packing 11 is not tightly sealed and causes medium leakage, the leaked medium can push the conical packing 7 to be in close contact with the conical cavity 22, so that there is better sealing between them. The bottom of the conical packing 7 is provided with an integral circular packing 8, which can ensure the sealing between the limiting cavity 23. At the same time, when the medium leaks, it can make a large-area contact with the leaking medium so as to be lifted up by the medium, and the top of the circular packing 8 can block the bottom of the conical cavity 22 with the help of the pressure of the medium; the conical packing 7 and the circular packing 8 are sleeved on the valve stem 4, and the conical packing 7 and the circular packing 8 are slidably connected with the valve stem 4;

[0032] The conical filler 7 and the circular filler 8 are slidably installed in the conical cavity 22 and the limit cavity 23, and the cone head of the conical filler 7 is in the conical cavity 22; it should be noted that, under normal circumstances, the outer surface of the conical filler 7 does not contact the inner surface of the conical cavity 22, and the top of the circular filler 8 does not contact the top of the limit cavity 23. In this way, during the normal rotation of the valve stem 4, the top of the conical filler 7 and the circular filler 8 can be prevented from being worn, thereby improving the overall service life.

[0033] An integrated bellows sleeve 9 is provided at the bottom of the circular packing 8. Through the setting of the bellows sleeve 9, when the circular packing 8 is subjected to the pressure of the leaking medium, the circular packing 8 and the conical packing 7 can be moved up and down, and the bellows sleeve 9 is elastically and slidably sleeved on the valve stem 4; an integrated nut 10 is provided at the bottom of the bellows sleeve 9. Through the setting of the nut 10, the stability and sealing between the middle packing and the valve stem 4 can be guaranteed, and the leaked medium can be prevented from leaking from between the middle packing and the valve stem 4, and the nut 10 and the valve stem 4 are fixedly connected by threads.

[0034] The outer surface of the valve stem 4 is evenly distributed with upper threads 41, middle threads 42 and lower threads 43 from top to bottom; the upper packing 5 is fixedly connected to the upper thread 41; the nut 10 is fixedly connected to the middle thread 42; the lower packing 11 is fixedly connected to the lower thread 43; the upper thread 41, the middle thread 42 and the lower thread 43 are arranged to facilitate disassembly and assembly between the upper packing 5, the middle packing and the lower packing 11.

[0035] An annular cavity 6 is provided at the bottom of the upper packing 5 so that when leakage occurs in the middle packing, the leaked medium can enter the annular cavity 6, forcing the upper packing 5 to expand, thereby making the upper packing 5 and the valve stem 4 and the valve stem cavity 21 tighter to prevent medium leakage.

[0036] In this embodiment, when in use, when the lower packing 11 is not sealed tightly, the leaked medium will enter the limiting cavity 23 and exert pressure on the circular packing 8, forcing the circular packing 8 to drive the conical packing 7 to move upward, so that the conical packing 7 enters the conical cavity 22, and at the same time, the top of the circular packing 8 blocks the bottom of the conical cavity 22. The greater the pressure of the leaked medium, the tighter the conical packing 7 is with the conical cavity 22 and the valve stem 4, thereby preventing medium leakage; when the circular packing 8 and the conical packing 7 are not sealed tightly, the leaked medium will enter the annular cavity 6, forcing the upper packing 5 to expand. The greater the medium pressure, the greater the expansion of the upper packing 5, which will make the upper packing 5 tighter with the valve stem cavity 22 and the valve stem 4, thereby preventing medium leakage.

[0037] Utilizing the technical solution described in the utility model, or those skilled in the art designing similar technical solutions inspired by the technical solution of the utility model to achieve the above-mentioned technical effects, all fall within the protection scope of the utility model.

Claims

1. A high-sealing butterfly valve applicable to multiple working conditions, characterized by: It comprises a valve body (1), wherein: a butterfly plate (3) is rotatably mounted in the valve body (1), and a valve stem (4) is rotatably mounted in a valve stem seat (2) of the valve body (1), and the valve stem (4) is fixedly connected to the butterfly plate (3); A packing gland (12), an upper packing (5), an intermediate packing and a lower packing (11) are sequentially arranged between the valve stem (4) and the valve stem seat (2) from top to bottom; the packing gland (12) and the valve stem seat (2) are fixedly connected, and the packing gland (12) and the valve stem (4) are rotatably connected; A valve stem cavity (21) is formed through the valve stem seat (2), and a conical cavity (22) and a position limiting cavity (23) are formed in the valve stem seat (2), wherein the conical cavity (22) is above the position limiting cavity (23); the valve stem cavity (21), the conical cavity (22) and the position limiting cavity (23) are connected; The valve stem (4), the upper packing (5) and the lower packing (11) are rotatably mounted in the valve stem cavity (21); the intermediate packing is rotatably and elastically slidably mounted in the conical cavity (22) and the limit cavity (23); the packing gland (12) is fixedly mounted in the valve stem cavity (21); The intermediate filler comprises a conical filler (7), and a circular filler (8) is provided at the bottom of the conical filler (7); The conical filler (7) and the circular filler (8) are sleeved on the valve stem (4), and the conical filler (7) and the circular filler (8) are slidably connected between the valve stem (4); The conical filler (7) and the circular filler (8) are slidably installed in the conical cavity (22) and the limiting cavity (23), and the cone head of the conical filler (7) is located in the conical cavity (22).

2. A multi-conditions applicable high sealing butterfly valve as claimed in claim 1, characterized in that: An integrated bellows sleeve (9) is provided at the bottom of the circular filler (8), and the bellows sleeve (9) is elastically and slidably sleeved on the valve stem (4); an integrated nut (10) is provided at the bottom of the bellows sleeve (9), and the nut (10) and the valve stem (4) are fixedly connected by threads.

3. A multi-conditions applicable high sealing butterfly valve as claimed in claim 2, characterized in that: The outer surface of the valve stem (4) is evenly provided with an upper thread (41), an intermediate thread (42) and a lower thread (43) from top to bottom; the upper filler (5) is fixedly connected to the upper thread (41); the nut (10) is fixedly connected to the intermediate thread (42); and the lower filler (11) is fixedly connected to the lower thread (43).

4. A multi-conditions applicable high sealing butterfly valve as claimed in claim 3, characterized in that: An annular cavity (6) is formed at the bottom of the upper filler (5).

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