Self-sealing butterfly valve

Abstract

The utility model discloses a self-sealing butterfly valve which comprises a valve body, the valve body comprises a cavity, an inlet and an outlet, and the inlet and the outlet are communicated with the cavity. The valve rod is rotationally connected with the valve body; the valve plate is fixedly connected with the valve rod. The valve seat and the valve body are movably connected and located on the side, close to the inlet, of the valve plate, a sealing cavity is formed between the valve body and the valve seat, an elastic piece is arranged in the sealing cavity, and when the butterfly valve is closed, the valve seat is pressed on the valve plate through the pressure of the elastic piece and media at the inlet so that sealing can be achieved. The self-sealing butterfly valve is good in sealing performance and not prone to leakage.

Description

TECHNICAL FIELD

[0001] The utility model relates to butterfly valve technical field especially relates to a self-sealing butterfly valve. BACKGROUND

[0002] Butterfly valve can be used for the switch of pipeline medium, at present, domestic is often used in petroleum, chemical industry, electric power, light textile, food, medicine, papermaking, municipal engineering and water plant industry etc. Butterfly valve usually includes valve body, valve seat, valve rod and valve plate, the valve rod drives the valve plate to rotate in the valve body, and the valve seat and the valve plate cooperate to realize sealing. But the conventional butterfly valve is prone to internal leakage and short service life, which cannot meet the process requirements more and more. SUMMARY

[0003] In order to overcome the above-mentioned shortcomings, the utility model discloses a self-sealing butterfly valve, good sealing property, not easy to leak.

[0004] In order to achieve the above object, the utility model adopts the technical scheme of a self-sealing butterfly valve, which comprises:

[0005] Valve body, the valve body includes cavity and the inlet and outlet with the cavity lead through;

[0006] Valve rod, the valve rod is rotationally connected with the valve body;

[0007] Valve plate, the valve plate is fixedly connected with the valve rod;

[0008] Valve seat, the valve seat is movably connected with the valve body and located at the side of the valve plate close to the inlet, a sealing cavity is formed between the valve body and the valve seat, an elastic member is arranged in the sealing cavity, and the elastic member and the pressure of the medium at the inlet press the valve seat on the valve plate to realize sealing when the butterfly valve is closed.

[0009] The utility model has the advantages that relative to the structure that the valve seat is fixedly connected with the valve body, the valve seat is arranged as a movable member, in the closed state, the elastic member is in the compression state, that is, has the pre-tightening force. At low pressure, the pre-tightening force of the elastic member mainly drives the valve seat and the valve plate to seal, ensuring zero leakage at low pressure;At high pressure, under the double action of the pre-tightening force of the elastic member and the medium pressure, the valve seat is pressed more and more tightly, ensuring zero leakage at high pressure. The butterfly valve in the embodiment forms a uniform and effective sealing specific pressure, and the leakage level can reach zero leakage.

[0010] Further, the valve seat comprises a first inclined surface, the first inclined surface is inclined towards the axis of the cavity from the side close to the valve rod to the side away from the valve rod;The valve plate comprises a second inclined surface matched with the first inclined surface, and the first inclined surface and the second inclined surface abut when the butterfly valve is closed.

[0011] When the valve seat moves towards the valve stem under the elastic member and the medium, the first inclined surface and the second inclined surface are in contact and the sealing performance is better and better, and the valve seat does not interfere with the valve plate when the valve plate is turned to open the butterfly valve.

[0012] Further, the first inclined surface can cover the second inclined surface. When the butterfly valve is closed, the first inclined surface is always in contact with the second inclined surface during the movement of the valve seat, and the sealing state is maintained.

[0013] Further, the first inclined surface and the second inclined surface are both fixed with a contact layer with the same inclination, and the contact layer is a hard alloy. By adding the contact layer, the butterfly valve is hard and hard sealed when sealed, and the service life of the butterfly valve is long.

[0014] Further, the valve body includes a boss, and a part of the valve seat is sleeved on the boss. The valve seat sleeved on the boss includes a vertical surface protruding from the valve body and facing the inlet, and the vertical surface can be in contact with the medium. By the vertical surface on the valve seat, the medium and the valve seat can be in contact, and when the medium flows from the inlet, the vertical surface can apply a force to the valve seat to press on the valve plate.

[0015] Further, the valve seat and the boss surround the sealing cavity, the elastic member is a disc spring fixed in the cavity, one end of the disc spring abuts against the boss, and the other end abuts against the valve seat. The disc spring is in the sealing cavity to avoid the medium entering the sealing cavity and causing corrosion or rust of the disc spring, which affects the elasticity of the disc spring.

[0016] Further, the valve seat includes a valve seat body and a self-tightening sealing ring and an abutting ring sleeved outside the valve seat body, the self-tightening sealing ring and the abutting ring are located between the valve seat body and the valve body, and the abutting ring abuts against the disc spring. The self-tightening sealing ring seals the connection between the valve seat body and the valve body, ensures the sealing performance of the sealing cavity, and avoids the medium entering the sealing cavity. The abutting ring is a hard member, which improves the uniformity of the force applied to the self-tightening sealing ring and the valve seat body, and protects the self-tightening sealing ring from being damaged by the disc spring.

[0017] Further, the valve plate includes a valve plate body and a valve plate sealing ring fixedly connected with the valve plate body, and the valve plate sealing ring protrudes from the valve plate body along the valve stem and abuts against the valve seat. The valve plate sealing ring protrudes from the valve plate body to realize the abutment of the first inclined surface and the second inclined surface.

[0018] Further, a groove is formed on the valve plate body, and part of the valve plate sealing ring is embedded in the groove, and a sealing ring pressing plate is fixed on the valve plate body to fix the valve plate sealing ring on the valve plate body.

[0019] Further, both ends of the valve rod pass through the cavity to be inserted into the valve body, and a guide sleeve is fixed on the valve body to be sleeved on the valve rod;

[0020] The valve body comprises a valve body and a bottom cover fixedly connected with the valve body, the bottom cover is located at one end of the valve rod, and the end of the valve rod away from the bottom cover passes through the valve body, and a sealing packing is arranged between the valve rod and the valve body. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of the utility model embodiment;

[0022] Figure 2 is Figure 1 is an enlarged view of A in the middle.

[0023] in the figure:

[0024] 1, valve body; 1a, inlet; 1b, outlet; 1c, axis of cavity; 11, valve body; 111, boss; 12, bottom cover;

[0025] 2, valve rod; 21, guide sleeve;

[0026] 3, valve plate; 31, valve plate body; 32, valve plate sealing ring; 321, second inclined surface; 33, sealing ring pressing plate;

[0027] 4, valve seat; 41, valve seat body; 411, first inclined surface; 412, vertical surface; 42, self-tightening sealing ring; 43, abutting ring;

[0028] 5, elastic member; 51, sealing cavity. DETAILED DESCRIPTION

[0029] The preferred embodiments of the utility model will be described in detail below with reference to the drawings, so that the advantages and features of the utility model can be more easily understood by those skilled in the art, and the protection scope of the utility model can be more clearly and explicitly defined.

[0030] EMBODIMENT

[0031] The utility model relates to a self-sealing butterfly valve, referring to the drawings of Figure 1As shown, including the valve body 1, valve stem 2, valve plate 3 and valve seat 4, the valve body 1 includes a cavity and with the cavity access 1a and 1b, the valve stem 2 is connected with the valve body 1, the valve plate 3 is fixedly connected with the valve stem 2 and located in the cavity, the valve seat 4 is located on the side of the valve plate 3 close to the inlet 1a, when the valve plate 3 and the valve seat 4 abut, the butterfly valve is in closed state.

[0032] In this embodiment, the valve seat 4 and the valve body 1 are movably connected, the valve seat 4 can move along the X direction in the drawing, that is, the axial direction of the cavity. A sealing cavity 51 is formed between the valve body 1 and the valve seat 4, and an elastic member 5 is arranged in the sealing cavity 51. When the butterfly valve is closed, the elastic member 5 and the pressure of the medium at the inlet 1a press the valve seat 4 tightly on the valve plate 3 to achieve sealing.

[0033] In this embodiment, compared with the structure that the valve seat 4 is fixedly connected with the valve body 1 in the prior art, the valve seat 4 is arranged as a movable part, and in the closed state, the elastic member 5 is in a compressed state, that is, has a pre-tightening force. At low pressure, the pre-tightening force of the elastic member 5 mainly drives the valve seat 4 to seal with the valve plate 3, ensuring zero leakage at low pressure; at high pressure, under the double action of the pre-tightening force of the elastic member 5 and the medium pressure, the valve seat 4 is pressed more tightly, ensuring zero leakage at high pressure. The butterfly valve in this embodiment forms a uniform and effective sealing specific pressure, and the leakage level can reach zero leakage. The valve seat 4 and the elastic member 5 form a self-sealing structure, greatly improving the sealing performance of the butterfly valve.

[0034] In one embodiment, referring to the accompanying drawings, Figure 2 As shown, the valve seat 4 includes a first inclined surface 411, which is inclined towards the axis 1c of the cavity from the side close to the valve stem 2 to the side away from the valve stem 2. The valve plate 3 includes a second inclined surface 321 matched with the first inclined surface 411, and the first inclined surface 411 and the second inclined surface 321 abut when the butterfly valve is closed.

[0035] In this embodiment, when the valve seat 4 moves towards the valve stem 2 under the pushing of the elastic member 5 and the medium, the cooperation of the first inclined surface 411 and the second inclined surface 321 makes the sealing performance better and better at the abutting position, and the valve seat 4 does not interfere with the valve plate 3 when the valve plate 3 rotates to open the butterfly valve. The cooperation of the two inclined surfaces and the sealing of the two planes make the sealing performance better.

[0036] In one embodiment, the first inclined surface 411 can cover the second inclined surface 321, that is, the length of the first inclined surface 411 in the X direction is greater than the length of the second inclined surface 321 in the X direction. When the butterfly valve is closed, the first inclined surface 411 is always in contact with the second inclined surface 321 during the movement of the valve seat 4, maintaining the sealing state.

[0037] In one embodiment, the first inclined surface 411 and the second inclined surface 321 are fixed with a contact layer with the same inclination, and the contact layer is cemented carbide, which can be formed by hardfacing on the first inclined surface 411 and the second inclined surface 321. In this embodiment, the contact layer can make the butterfly valve seal hard against hard when sealing, and the service life of the butterfly valve is long, which can be used in high temperature and other harsh environments to ensure the control requirements and reliability of various working conditions.

[0038] Referring to the drawings Figure 2 As shown in the drawings, the valve body 1 includes a boss 111, and a part of the valve seat 4 is sleeved on the boss 111. The valve seat 4 sleeved on the boss 111 includes a vertical surface 412 protruding from the valve body 1 and facing the inlet 1a, which can be in contact with the medium. The vertical surface 412 on the valve seat 4 allows the medium to contact the valve seat 4, and when the medium flows from the inlet 1a, the medium can apply a force to the valve seat 4 through the vertical surface 412. Figure 2 The force F shown by the hollow arrow can make the valve seat 4 press against the valve plate 3.

[0039] Although the valve seat 4 can slide relative to the valve body 1, it will not be separated from the valve body 1 due to the limitation of the valve rod 2.

[0040] The valve seat 4 and the boss 111 surround the sealing cavity 51, and the elastic member 5 is a disc spring fixed in the cavity. One end of the disc spring abuts against the boss 111, and the other end abuts against the valve seat 4. The disc spring is in a compressed state when the butterfly valve is closed, and the disc spring applies a force to the valve seat 4 to press against the valve plate 3. The disc spring is in the sealing cavity 51, which can prevent the medium from entering the sealing cavity 51 and causing corrosion or rust of the disc spring, thereby affecting the elasticity of the disc spring.

[0041] Referring to the drawings Figure 2 As shown in the drawings, the valve seat 4 includes a valve seat body 41, a self-tightening sealing ring 42 sleeved on the valve seat body 41, and an abutting ring 43. The self-tightening sealing ring 42 and the abutting ring 43 are located between the valve seat body 41 and the valve body 1. The self-tightening sealing ring 42 seals the connection between the valve seat body 41 and the valve body 1, which can ensure the sealing of the sealing cavity 51 and prevent the medium from entering the sealing cavity 51. The abutting ring 43 abuts against the disc spring, and the abutting ring 43 is a hard member, which can improve the uniformity of the force applied to the self-tightening sealing ring 42 and the valve seat body 41, and protect the self-tightening sealing ring 42 from being damaged by the disc spring.

[0042] The first inclined surface 411 and the vertical surface 412 are both arranged on the valve seat body 41, and the valve seat body 41 is an elastic member 5 similar to a sealing ring, which has elasticity and can realize sealing.

[0043] The valve plate 3 comprises a valve plate body 31 and a valve plate sealing ring 32 fixedly connected with the valve plate body 31, the valve plate sealing ring 32 protrudes the valve plate body 31 along the valve rod 2 and abuts against the valve seat 4, a second inclined surface 321 is arranged on the valve plate sealing ring 32, the valve plate sealing ring 32 protrudes the valve plate body 31, so that the first inclined surface 411 and the second inclined surface 321 abut against each other, and the first inclined surface 411 can realize sealing by deforming the valve plate sealing ring 32.

[0044] In one embodiment, the valve seat body 41 and the valve plate sealing ring 32 are both hard metal parts, so that sealing can be realized without additionally arranging a contact layer.

[0045] The valve plate body 31 is provided with a groove, part of the valve plate sealing ring 32 is embedded in the groove, and the valve plate body 31 is fixedly provided with a sealing ring pressing plate 33, the sealing ring pressing plate 33 fixes the valve plate sealing ring 32 on the valve plate body 31, and the valve plate sealing ring 32 is fixed by the sealing ring pressing plate 33, so that installation and processing are facilitated.

[0046] The valve plate body 31 is fixedly connected with the valve rod 2 through a positioning pin.

[0047] Referring to FIG. 1, Figure 1 As shown in the drawings, the two ends of the valve rod 2 pass through the cavity to be inserted into the valve body 1, the valve body 1 is fixedly provided with a guide sleeve 21 sleeved on the valve rod 2, the valve rod 2 rotates along the axis thereof, and the guide sleeve 21 is wear-resistant, thereby effectively protecting the valve body 1 and the valve rod 2.

[0048] The valve body 1 comprises a valve body 11 and a bottom cover 12 fixedly connected with the valve body 11, the bottom cover 12 is located at one end of the valve rod 2, the end of the valve rod 2 away from the bottom cover 12 passes through the valve body 11, the valve rod 2 passing through the valve body 11 is connected with a driving member, and rotates along the axis thereof under the driving of the driving member, so that the butterfly valve is switched between opening and closing.

[0049] A sealing packing is arranged between the valve rod 2 and the valve body 11, the sealing packing is used for sealing the connection between the valve rod 2 and the valve body 11, so that leakage of medium is avoided.

[0050] The above embodiments are only used for illustrating the technical concept and characteristics of the utility model, the purpose is to enable the person skilled in the art to understand the content of the utility model and implement it, and cannot limit the protection scope of the utility model, any equivalent change or modification according to the spirit and essence of the utility model should be covered in the protection scope of the utility model.

Claims

1. A self-sealing butterfly valve, characterized in that: include: A valve body, the valve body including a cavity and an inlet and an outlet communicating with the cavity; A valve stem, which is rotatably connected to the valve body; A valve plate, which is fixedly connected to the valve stem; A valve seat is movably connected to the valve body and located on the side of the valve plate near the inlet. A sealed cavity is formed between the valve body and the valve seat. An elastic element is provided in the sealed cavity. When the butterfly valve is closed, the elastic element and the pressure of the medium at the inlet press the valve seat against the valve plate to achieve a seal.

2. The self-sealing butterfly valve according to claim 1, characterized in that: The valve seat includes a first inclined surface that slopes toward the axis of the cavity from the side near the valve stem to the side away from the valve stem. The valve plate includes a second inclined surface that cooperates with the first inclined surface. When the butterfly valve is closed, the first inclined surface and the second inclined surface abut against each other.

3. The self-sealing butterfly valve according to claim 2, characterized in that: The first inclined plane can cover the second inclined plane.

4. The self-sealing butterfly valve according to claim 2, characterized in that: Both the first and second inclined surfaces are fixed with a contact layer of the same inclination degree, and the contact layer is made of hard alloy.

5. The self-sealing butterfly valve according to claim 1, characterized in that: The valve body includes a boss, and a portion of the valve seat is fitted onto the boss. The valve seat fitted onto the boss includes a vertical surface facing the inlet and protruding from the valve body, and the vertical surface can contact the medium.

6. The self-sealing butterfly valve according to claim 5, characterized in that: The valve seat and the boss surround to form the sealing cavity. The elastic element is a disc spring fixed in the cavity. One end of the disc spring abuts against the boss, and the other end abuts against the valve seat.

7. The self-sealing butterfly valve according to claim 6, characterized in that: The valve seat includes a valve seat body and a self-tightening sealing ring and abutment ring sleeved on the valve seat body. The self-tightening sealing ring and the abutment ring are located between the valve seat body and the valve body, and the abutment ring abuts against the disc spring.

8. The self-sealing butterfly valve according to claim 1, characterized in that: The valve plate includes a valve plate body and a valve plate sealing ring fixedly connected to the valve plate body. The valve plate sealing ring protrudes from the valve plate body along the valve stem axis and abuts against the valve seat.

9. The self-sealing butterfly valve according to claim 8, characterized in that: The valve plate body has a groove, and part of the valve plate sealing ring is embedded in the groove. A sealing ring pressure plate is fixed on the valve plate body, and the sealing ring pressure plate fixes the valve plate sealing ring on the valve plate body.

10. The self-sealing butterfly valve according to any one of claims 1-9, characterized in that: Both ends of the valve stem pass through the cavity to be inserted into the valve body, and a guide sleeve is fixed inside the valve body and sleeved on the outside of the valve stem; The valve body includes a valve body body and a bottom cover fixedly connected to the valve body body. The bottom cover is located at one end of the valve stem, and the end of the valve stem away from the bottom cover passes through the valve body body. A sealing packing is provided between the valve stem and the valve body body.

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