A multi-seal plug valve

Abstract

The utility model relates to the field of valve technology, and in particular to a multi-sealed plug valve; it comprises a valve body, a valve stem, and a plug body, and is characterized in that the plug body is a truncated cone structure with an upper outer diameter greater than a lower outer diameter, a clamping sleeve is provided between the valve body and the top outer wall of the plug body, and the inner side surface of the clamping sleeve abuts against the surface of the plug body; a sealing valve seat is provided between the valve body and the lower outer wall of the plug valve, the inner wall of the sealing valve seat abuts against the surface of the plug valve, the outer surface of the sealing valve seat abuts against a clamping groove arranged on the inner wall of the valve body, and an axially arranged elastic component is provided between the lower end surface of the sealing valve seat and the valve body; an elastic deformation layer is provided on the outer surface of the sealing valve seat; the utility model realizes self-compensating sealing, and in the event of vibration, sealing can also be realized by self-compensation, so that the sealing effect of the sealing valve seat is better, the service life is longer, and the replacement cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a multi-sealed plug valve. Background Art

[0002] As a type of valve widely used in the field of fluid control, the core structure of the plug valve realizes the opening and closing control of the flow channel through the rotational cooperation between the plug body and the valve seat. Traditional plug valves mostly adopt a conical plug structure, relying on the compression fit of a single sealing surface and the valve seat to achieve sealing. However, under conditions of high temperature, high pressure or the presence of particulate impurities in the medium, this type of design is prone to seal failure due to thermal deformation of the material, wear of the sealing surface or penetration of the medium, which in turn causes leakage problems. Especially for long-term conditions of frequent opening and closing or high-pressure shocks, the sealing components of traditional plug valves are prone to plastic deformation, resulting in a decrease in the sealing preload, requiring frequent maintenance or replacement of seals, and significantly increasing the cost of use.

[0003] In the existing technology, some improvement schemes try to improve the sealing performance by adding auxiliary sealing rings or optimizing the taper of the plug, but there are still limitations: first, a single sealing structure is difficult to cope with multi-directional stress under dynamic conditions, and local gaps are prone to appear on the sealing surface; second, there is a lack of elastic compensation design for the sealing element, which is prone to gaps under temperature fluctuations or mechanical vibrations; third, the packing seal between the valve stem and the valve body often causes medium leakage due to uneven clamping force. In addition, the conventional metal sealing material has insufficient deformation recovery ability under extreme temperatures, which further limits the reliability of the valve under complex working conditions.

[0004] Therefore, there is an urgent need to provide an improved technical solution to solve the above technical problems. Utility Model Content

[0005] The purpose of the utility model is to provide a technical effect of a ferrule plug valve that achieves multiple seals in response to the above-mentioned technical problems.

[0006] In view of this, the utility model provides a multi-sealed plug valve, comprising a valve body, a valve stem, and a plug body, characterized in that the plug body is a truncated cone structure with an upper outer diameter greater than a lower outer diameter, a ferrule is provided between the valve body and the top outer wall of the plug body, and the inner side of the ferrule contacts the surface of the plug body;

[0007] A sealing valve seat is provided between the valve body and the lower outer side wall of the plug valve, the inner wall of the sealing valve seat abuts against the surface of the plug valve, the outer surface of the sealing valve seat abuts against the groove arranged on the inner wall of the valve body, and an axially arranged elastic component is provided between the lower end surface of the sealing valve seat and the valve body; an elastic deformation layer is provided on the outer surface of the sealing valve seat.

[0008] Furthermore, it also includes:

[0009] A compression elastic member is axially arranged between the valve body and the top of the plug valve.

[0010] Furthermore, it also includes:

[0011] The plastic gasket and the memory alloy gasket are overlapped and arranged between the valve body and the top surface of the rotary plug, and are sleeved on the outer side of the valve stem.

[0012] Furthermore, sealing rubber rings are provided on one side of the inner and outer deformation directions of the memory alloy gasket.

[0013] Furthermore, it also includes:

[0014] The bracket is fixedly connected to the top of the valve body, and the valve stem is rotatably connected to the bracket.

[0015] Furthermore, it also includes:

[0016] A packing chamber, which is arranged at the top of the valve body and around the valve stem;

[0017] The packing gland is mounted on the valve stem and sealed on the top of the packing cavity and fixed to the valve body by studs.

[0018] The beneficial effects of the utility model are:

[0019] 1. The utility model realizes self-compensation sealing, and can also realize sealing through self-compensation during vibration, so that the sealing effect of the sealing valve seat is better, the service life is longer, and the replacement cost is reduced.

[0020] 2. The utility model compresses the elastic member so that when the ferrule is worn and a gap is generated, the plug body can always be pressed against the inner surface of the ferrule, which can effectively improve the sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a cross-sectional structural schematic diagram of the utility model;

[0022] Figure 2 for Figure 1 Schematic diagram of the structure of the middle A area;

[0023] Figure 3 for Figure 1 Schematic diagram of the structure of area B in the middle.

[0024] The symbols in the figure are:

[0025] 1. Valve body; 2. Valve stem; 3. Plug body; 4. Ferrule; 5. Plastic gasket; 6. Memory alloy gasket; 7. Bracket; 8. Sealing rubber ring; 9. Packing cavity; 10. Packing sleeve; 11. Elastic deformation layer; 12. Elastic component; 13. Compression elastic part; 14. Sealing valve seat. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0027] Embodiment 1:

[0028] This embodiment provides a multi-sealed plug valve, comprising a valve body 1, a valve stem 2, and a plug body 3, wherein the plug body 3 is a truncated cone structure with an upper outer diameter greater than a lower outer diameter, a ferrule 4 is provided between the valve body 1 and the top outer wall of the plug body 3, and the inner side surface of the ferrule 4 contacts the surface of the plug body 3;

[0029] A sealing valve seat 14 is provided between the valve body 1 and the lower outer side wall of the plug valve, the inner wall of the sealing valve seat 14 abuts against the surface of the plug valve, the outer surface of the sealing valve seat 14 abuts against the groove provided on the inner wall of the valve body 1, and an axially arranged elastic member 12 is provided between the lower end surface of the sealing valve seat 14 and the valve body 1; an elastic deformation layer 11 is provided on the outer surface of the sealing valve seat 14.

[0030] The valve body 1 includes a main valve body 1 and a valve cover, a rotating plug body 3 is arranged inside the valve body 1, a connecting groove for plugging with the valve stem 2 is arranged on the top of the plug body 3, the plug body 3 is a truncated cone (also called a cone) structure, and the upper outer diameter of the plug body 3 is larger than the lower outer diameter, a through hole for communication is arranged on the plug body 3, a ferrule 4 is fixedly arranged on the valve body 1, and a plurality of fixing grooves for fixing the ferrule 4 are arranged on the inner wall of the valve body 1, the ferrule 4 is arranged between the valve body 1 and the top outer peripheral side wall of the plug body 3, and the inner side surface of the ferrule 4 conflicts with the surface of the plug body 3, that is, the inclination angle of the inner side surface of the ferrule 4 The degree is the same as the inclination angle of the surface of the plug body 3, and the sleeve 4 plays a sealing role; a sealing valve seat 14 is provided between the valve body 1 and the lower outer side wall of the plug valve, the inner side wall of the sealing valve seat 14 abuts on the surface of the plug valve, and the outer surface of the sealing valve seat 14 abuts on the inclined side wall of the card groove arranged on the inner wall of the valve body 1, and the inclined side wall is inclined outward from top to bottom, and an axially arranged elastic member 12 is provided between the lower end surface of the sealing valve seat 14 and the valve body 1, which can be selected as a high-strength spring and is sleeved outside the plug valve, and an elastic deformation layer 11 is provided on the outer surface of the sealing valve seat 14.

[0031] Working principle:

[0032] After multiple rotations, the friction between the sealing valve seat 14 and the plug body 3 will cause wear, and the wear between the plug valve and the ferrule 4 will cause the plug body 3 to sink, or the assembly gap will become larger, resulting in a poor sealing effect. Under the action of the high-strength spring, the sealing valve seat 14 is pushed to move upward, and the displacement is obtained by compressing the elastic deformation layer 11, so that the sealing valve seat 14 is in contact with the surface of the plug body 3. The elastic deformation layer 11 can be made of a compressible sealing material, such as rubber. While sealing, the sealing valve seat 14 can be provided with a displacement to achieve self-compensating sealing, and during vibration, sealing can also be achieved through self-compensation, so that the sealing effect of the sealing valve seat 14 is better, the service life is longer, and the replacement cost is reduced.

[0033] In order to prevent the temperature from affecting the working state of the elastic deformation layer 11 , the elastic deformation layer 11 is made of a high temperature resistant material.

[0034] Embodiment 2:

[0035] This embodiment provides a multi-sealed plug valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0036] Also includes:

[0037] The compression elastic member 13 is axially arranged between the valve body 1 and the top of the plug valve.

[0038] The clamping elastic member 13 is also selected to be a high-strength spring, which can provide a strong reaction force. A mounting groove for installing the clamping elastic member 13 is provided at the bottom of the valve cover. Through the clamping elastic member 13, when the ferrule 4 wears and a gap is generated, the plug body 3 can always be acted on the inner surface of the ferrule 4, which can effectively improve the sealing effect.

[0039] Embodiment 3:

[0040] This embodiment provides a multi-sealed plug valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0041] Also includes:

[0042] The plastic gasket 5 and the memory alloy gasket 6 are overlapped and arranged between the valve body 1 and the top surface of the rotary plug, and are sleeved on the outer side of the valve stem 2 .

[0043] The plastic gasket 5 prevents the plug valve from wearing and plays a certain sealing role. The memory alloy gasket 6 is a gasket with one side tilted upward and the other side tilted downward. The memory alloy gasket 6 can adjust its own shape according to the magnitude of the stress it is subjected to. When the plug body 3 moves downward, the stability of the gasket structure is ensured to prevent the gasket's fixing and sealing functions from failing.

[0044] Embodiment 4:

[0045] This embodiment provides a multi-sealed plug valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0046] A sealing rubber ring 8 is provided on one side of the inner and outer deformation direction of the memory alloy gasket 6 .

[0047] A sealing rubber ring 8 is provided on the lower end surface of the higher side and the upper end surface of the lower side of the memory alloy gasket 6. The sealing rubber ring 8 can be fixed on the memory alloy gasket 6 by glue. The provided sealing rubber ring 8 can effectively improve the sealing performance of the memory alloy gasket 6.

[0048] Embodiment 5:

[0049] This embodiment provides a multi-sealed plug valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0050] Also includes:

[0051] The bracket 7 is fixedly connected to the top of the valve body 1 , and the valve stem 2 is rotatably connected to the bracket 7 .

[0052] The support leg is fixed to the valve cover by bolts, and a through hole for installing the valve stem 2 is provided on the top. The valve stem 2 is rotatably connected in the through hole. The specific connection method can be through a bearing connection. The bracket 7 is used to fix the servo motor used to drive the valve stem 2 to rotate.

[0053] Embodiment 6:

[0054] This embodiment provides a multi-sealed plug valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0055] Also includes:

[0056] A packing chamber 9, which is arranged at the top of the valve body 1 and around the valve stem 2;

[0057] The packing gland 10 is sleeved on the valve stem 2 and sealed on the top of the packing cavity 9 and fixed on the valve body 1 by means of studs.

[0058] The packing cavity 9 is filled with flexible graphite packing, and the packing compression sleeve 10 structure ensures that the packing is compacted, reduces the packing leakage rate, and improves the sealing performance of the valve.

[0059] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific embodiments. The above-mentioned specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which belong to the protection scope of the present application.

Claims

1. A multi-seal plug valve, comprising a valve body (1), a valve stem (2), and a plug body (3), characterized in that: The plug body (3) is a truncated cone structure with an upper outer diameter larger than a lower outer diameter. A clamping sleeve (4) is provided between the valve body (1) and the top outer wall of the plug body (3), and the inner side surface of the clamping sleeve (4) abuts against the surface of the plug body (3). A sealing valve seat (14) is provided between the valve body (1) and the lower outer side wall of the plug valve, the inner wall of the sealing valve seat (14) abuts against the surface of the plug valve, the outer surface of the sealing valve seat (14) abuts against a groove provided on the inner wall of the valve body (1), and an axially arranged elastic member (12) is provided between the lower end surface of the sealing valve seat (14) and the valve body (1); and an elastic deformation layer (11) is provided on the outer surface of the sealing valve seat (14).

2. A multi-sealed plug valve according to claim 1, characterized in that: Also includes: A clamping elastic member (13) is axially arranged between the valve body (1) and the top of the plug valve.

3. A multi-sealed plug valve according to claim 1, characterized in that: Also includes: The plastic gasket (5) and the memory alloy gasket (6) are overlapped and arranged between the valve body (1) and the top surface of the rotary plug, and are sleeved on the outside of the valve stem (2).

4. A multi-sealed plug valve according to claim 3, characterized in that: Sealing rubber rings (8) are provided on one side of the inner and outer deformation directions of the memory alloy gasket (6).

5. A multi-sealed plug valve according to claim 1, characterized in that: Also includes: The bracket (7) is fixedly connected to the top of the valve body (1), and the valve stem (2) is rotatably connected to the bracket (7).

6. A multi-sealed plug valve according to claim 1, characterized in that: Also includes: A packing chamber (9), the packing chamber (9) being arranged at the top of the valve body (1) and surrounding the valve stem (2); The packing gland (10) is sleeved on the valve stem (2), sealed at the top of the packing cavity (9), and fixed to the valve body (1) via studs.

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