High and low temperature bidirectional sealing butterfly valve

Abstract

The utility model provides a high and low temperature two-way sealing butterfly valve which comprises a valve seat and a valve plate assembly, a sealing assembly is arranged between the valve plate assembly and the valve seat, the sealing assembly comprises a fixing ring, a positioning ring and an elastic sealing ring, the elastic sealing ring comprises a supporting ring and an elastic ring, a bending part is arranged on the supporting ring, and an annular mounting groove is formed between the bending part and the supporting ring. The elastic ring is arranged in the annular mounting groove, and the bent part makes contact with the valve plate assembly. When the butterfly plate rotates to be closed, the sealing ring extrudes the supporting ring inwards, the elastic ring provides outward extrusion force for the supporting ring, the sealing specific pressure between the supporting ring and the sealing ring is increased, and sealing is facilitated. The supporting ring and the valve plate sealing ring form a sealing pair to seal the butterfly valve, the elastic sealing ring structure has a good sealing effect under the high and low temperature working conditions, bidirectional sealing can be achieved easily, the configuration of a needed executing mechanism is small, and the cost of the whole butterfly valve can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve equipment field, especially a high and low temperature bidirectional sealing butterfly valve. BACKGROUND

[0002] At present, the reverse sealing performance requirement of butterfly valve in industrial equipment is higher and higher, however, due to the eccentric asymmetric structure of three eccentric butterfly valve, the three eccentric butterfly valve has the characteristics of one-way sealing, the conventional three eccentric butterfly valve cannot satisfy the requirement of bidirectional sealing performance, especially for high temperature or low temperature working condition, the size of metal parts is greatly changed by temperature, which is not conducive to the sealing of sealing pair, and the difficulty of realizing bidirectional sealing is increased.

[0003] In order to make the three eccentric butterfly valve satisfy the sealing performance of two directions, the butterfly valve manufacturers generally adopt floating valve seat structure at present, realize sealing under the action of the torque of the actuator (the same as the sealing principle of conventional three eccentric structure), rely on the medium to push the floating valve seat, increase the force between the valve seat and the sealing ring, and realize sealing. The floating valve seat can realize good bidirectional sealing performance under normal temperature working condition, however, under high temperature and low temperature working condition, the bidirectional sealing effect of floating valve seat structure is poor. The present application can reduce the size change of sealing parts under the influence of temperature at the limit temperature working condition by designing an elastic sealing ring structure, so that the three eccentric butterfly valve has bidirectional sealing performance.

[0004] In addition, under high temperature and low temperature working condition, the size of metal sealing pair is greatly changed by temperature, if the elastic sealing form is not adopted, and only the torque provided by the actuator is relied on to make the sealing pair forced sealing, the configuration of the actuator required will be very large, and the friction force between the sealing pairs when closing is also very large, which seriously affects the service life of the butterfly valve. CONTENT OF THE UTILITY MODEL

[0005] In view of the above-mentioned defects of the prior art, the purpose of the present application is to provide a high and low temperature bidirectional sealing butterfly valve, which is used to solve the technical problem that the size of metal sealing pair is greatly changed by temperature under high temperature and low temperature working condition, and only the torque provided by the actuator is relied on to make the sealing pair forced sealing, which will cause the friction force between the sealing pairs when closing to be very large, and seriously affect the service life of the butterfly valve.

[0006] In order to achieve the above-mentioned purpose and other related purposes, the utility model provides a high and low temperature bidirectional sealing butterfly valve, which comprises:

[0007] A valve seat, a valve plate assembly is installed in the valve seat through a valve rod;

[0008] A sealing assembly is arranged between the valve plate assembly and the valve seat, and the sealing assembly comprises a fixing ring, a positioning ring and an elastic sealing ring.

[0009] The above technical solution has the advantages that the elastic sealing ring structure has good sealing effect under large temperature changes such as high and low temperatures, and is conducive to realizing bidirectional sealing, and the required actuator configuration is smaller, thereby reducing the cost of the butterfly valve.

[0010] Optionally, the outer edge of the support ring is inserted between the fixing ring and the positioning ring.

[0011] Optionally, the insertion depth of the support ring is greater than half the width of the annular portion of the support ring.

[0012] Optionally, a mounting groove is further arranged between the fixing ring and the positioning ring, and the curved portion of the support ring is located in the mounting groove.

[0013] Optionally, the inner diameter of the fixing ring and the positioning ring is greater than the inner diameter of the support ring, and the outer diameter of the fixing ring and the positioning ring is greater than the outer diameter of the support ring.

[0014] Optionally, the support ring is a metal structure.

[0015] Optionally, the elastic ring is a ring-shaped spring.

[0016] Optionally, the groove wall of the annular mounting groove matches the outer wall of the elastic ring.

[0017] Optionally, a sealing washer is further arranged between the fixing ring and the valve body.

[0018] Optionally, a sealing groove is further arranged on the valve body, and the sealing washer is embedded in the sealing groove.

[0019] The utility model discloses a high and low temperature two -way sealing butterfly valve, which has the following beneficial effects: when the butterfly plate rotates to close, the sealing ring on the butterfly plate extrudes the support ring of the elastic sealing ring inward, the elastic ring in the inner ring of the elastic sealing ring provides the outward extruding force to the support ring, the sealing specific pressure between the support ring of the elastic sealing ring and the valve plate sealing ring increases, which is beneficial to sealing. The support ring of the elastic sealing ring can support the inner support ring and form a sealing pair with the valve plate sealing ring to realize the sealing effect on the butterfly valve. The elastic sealing ring structure has good sealing effect in the working condition of high and low temperature and other large temperature changes, and is beneficial to realizing two -way sealing, and the required actuating mechanism configuration is smaller, and the cost of the butterfly valve complete machine can be reduced. BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 The cross-sectional structure schematic diagram in the embodiment of the utility model is shown.

[0021] Fig. 2 The X place local enlarged schematic diagram in the embodiment of the utility model is shown.

[0022] Fig. 3 The cross-sectional structure schematic diagram of the elastic sealing ring in the embodiment of the utility model is shown.

[0023] PART NUMBER EXPLANATION

[0024] 1 valve seat

[0025] 2 fixed ring

[0026] 3 positioning ring

[0027] 4 elastic sealing ring

[0028] 401 support ring

[0029] 402 elastic ring

[0030] 5 valve plate assembly DETAILED DESCRIPTION

[0031] The embodiments of the utility model are explained below through specific concrete examples, and the person skilled in the art can easily understand other advantages and effects of the utility model from the contents disclosed in the specification. The utility model can also be implemented or applied through other different specific embodiments, and each detail in the specification can be modified or changed based on different viewpoints and applications without departing from the spirit of the utility model.

[0032] Please refer to Figs. 1 to 3It is to be noted that the drawings provided in the present embodiment only schematically illustrate the basic concept of the present application, and only show the components related to the present application in the drawings, rather than being drawn according to the number, shape and size of the components in actual implementation. The shape, number and proportion of each component in implementation can be arbitrarily changed, and the component layout pattern can be more complex. The structure, proportion, size and the like shown in the drawings of the present specification are only used to cooperate with the content disclosed in the specification, so as to be understood and read by those skilled in the art, and do not limit the implementation conditions of the present application, and therefore do not have substantial technical significance. Any modification of structure, change of proportion relationship or adjustment of size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" in the present specification are only for the convenience of clear description, and are not used to limit the scope of the present application. The change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application.

[0033] Please refer to Figs. 1 to 3 The utility model provides a high and low temperature bidirectional sealing butterfly valve, including:

[0034] Valve seat 1, the valve plate assembly 5 is installed in the valve seat 1 through valve rod;

[0035] The sealing assembly is arranged between the valve plate assembly 5 and the valve seat 1, and the sealing assembly includes a fixing ring 2, a positioning ring 3 and an elastic sealing ring 4.

[0036] It should be further noted that, in use, a sealing washer is first arranged on the valve body, and then the fixing ring 2, the elastic sealing ring 4 and the positioning ring 3 are sequentially installed, which are fixed by the valve seat retaining ring. When the butterfly plate is rotated to close, the sealing ring on the butterfly plate extrudes the support ring 401 of the elastic sealing ring 4 inward, and the elastic ring 402 in the elastic sealing ring 4 provides an outward extrusion force to the support ring 401, so that the sealing specific pressure between the support ring 401 and the valve plate sealing ring increases, which is beneficial to sealing.

[0037] For example, the outer edge of the support ring 401 is inserted between the fixing ring 2 and the positioning ring 3.

[0038] Exemplarily, the insertion depth of the support ring 401 is greater than half the width of the circular ring portion of the support ring 401.

[0039] It is also to be explained that the purpose of the insertion depth of the support ring 401 being greater than half the width of the circular ring portion of the support ring 401 is to ensure that the support ring 401 will not be pressed off between the fixing ring 2 and the positioning ring 3.

[0040] Exemplarily, a mounting groove is further provided between the fixing ring 2 and the positioning ring 3, and the curved portion of the support ring 401 is located in the mounting groove.

[0041] It is also to be explained that the slot opening of the annular mounting groove faces the mounting groove.

[0042] Exemplarily, the inner diameter of the fixing ring 2 and the positioning ring 3 is greater than the inner diameter of the support ring 401, and the outer diameter of the fixing ring 2 and the positioning ring 3 is greater than the outer diameter of the support ring 401.

[0043] It is also to be explained that after the fixing ring 2 and the positioning ring 3 are mounted, the outer circle of the support ring 401 can be in contact with the outer circle edge of the valve plate assembly 5.

[0044] Exemplarily, the support ring 401 is a metal structure.

[0045] It is also to be explained that the support ring 401 is provided as a metal structure to ensure the structural strength.

[0046] The material of the support ring 401 can be copper alloy, nickel alloy, titanium alloy, etc.

[0047] Exemplarily, the elastic ring 402 is an annular spring.

[0048] It is also to be explained that the elastic ring 402 can also be made of annular materials with elasticity, such as rubber, silicone, polyurethane, etc.

[0049] Exemplarily, the groove wall of the annular mounting groove matches the outer wall of the elastic ring 402.

[0050] It is also to be explained that the contact area between the two is increased, further improving the extrusion effect of the elastic ring 402 on the support ring 401 and improving the sealing performance.

[0051] Exemplarily, a sealing gasket is further provided between the fixing ring 2 and the valve body 1.

[0052] It is also to be explained that the sealing performance between the fixing ring 2 and the valve body 1 is further improved.

[0053] Exemplarily, the valve body is further provided with a sealing groove, and the sealing gasket is embedded in the sealing groove.

[0054] It should be further noted that the sealing groove is provided for the sealing gasket to provide a mounting position and avoid displacement of the sealing gasket during friction.

[0055] The valve plate sealing ring adopts a three-eccentric structure, which can reduce friction and extrusion of the valve plate sealing ring on the elastic sealing ring during closing, so that the sealing pair of the butterfly valve only starts to contact when the butterfly valve is closed.

[0056] In summary, the high-low temperature bidirectional sealing butterfly valve has the advantages that when the butterfly plate is rotated and closed, the sealing ring on the butterfly plate extrudes the support ring 401 of the elastic sealing ring 4 inward, the elastic ring 402 in the inner ring of the elastic sealing ring provides extrusion force outward to the support ring 401, the sealing specific pressure between the support ring 401 of the elastic sealing ring and the valve plate sealing ring is increased, and the sealing is beneficial. The support ring 401 of the elastic sealing ring can support the inner support ring 401 and form a sealing pair with the valve plate sealing ring to realize the sealing effect of the butterfly valve. In the working condition of large temperature change such as high and low temperature, the elastic sealing ring structure has good sealing effect, is beneficial to bidirectional sealing, requires small configuration of an execution mechanism, and can reduce the cost of the butterfly valve.

[0057] The above examples only exemplarily illustrate the principle and effect of the utility model, and are not used to limit the utility model. Any person skilled in the art can modify or change the above examples without departing from the spirit and scope of the utility model. Therefore, all equivalent modifications or changes completed by those skilled in the art without departing from the spirit and technical thought of the utility model should be covered by the claims of the utility model.

Claims

1. A high and low temperature bidirectional sealing butterfly valve, comprising a valve body, characterized in that: The butterfly valve further comprises: A valve seat (1), in which a valve plate assembly is mounted via a valve stem; A sealing assembly is provided between the valve plate assembly and the valve seat (1), the sealing assembly comprising a fixing ring (2), a positioning ring (3) and an elastic sealing ring (4), the elastic sealing ring (4) comprising a support ring (401) and an elastic ring (402), the inner ring edge of the support ring (401) being bent toward the same side to form a curved portion, an annular mounting groove being formed between the curved portion and the support ring (401), the elastic ring (402) being sleeved on the curved portion of the support ring (401), the elastic ring (402) being located in the annular mounting groove, and the outer wall of the curved portion being in contact with the valve plate assembly.

2. A high and low temperature bidirectional sealing butterfly valve according to claim 1, characterized in that: The outer ring edge of the support ring (401) is inserted between the fixing ring (2) and the positioning ring (3).

3. A high and low temperature bidirectional sealing butterfly valve according to claim 2, characterized in that: The insertion depth of the support ring (401) is greater than half the width of the circular portion of the support ring (401).

4. A high and low temperature bidirectional sealing butterfly valve according to claim 3, characterized in that: A mounting groove is further provided between the fixing ring (2) and the positioning ring (3), and the curved portion of the support ring (401) is located in the mounting groove.

5. A high and low temperature bidirectional sealing butterfly valve according to claim 4, characterized in that: The inner diameters of the fixing ring (2) and the positioning ring (3) are larger than the inner diameter of the support ring (401), and the outer diameters of the fixing ring (2) and the positioning ring (3) are larger than the outer diameter of the support ring (401).

6. A high and low temperature bidirectional sealing butterfly valve according to claim 5, characterized in that: The support ring (401) is a metal structure.

7. A high and low temperature bidirectional sealing butterfly valve according to claim 6, characterized in that: The elastic ring (402) is an annular spring.

8. The high and low temperature bidirectional sealing butterfly valve according to claim 7, characterized in that: The groove wall of the annular mounting groove matches the outer wall of the elastic ring (402).

9. The high and low temperature bidirectional sealing butterfly valve according to claim 8, characterized in that: A sealing gasket is also provided between the fixing ring (2) and the valve body.

10. The high and low temperature bidirectional sealing butterfly valve according to claim 9, characterized in that: The valve body is also provided with a sealing groove, and the sealing gasket is embedded in the sealing groove.

Images