Gate valve with composite sealing structure

Abstract

The utility model provides a gate valve with a composite sealing structure, which comprises a valve body, a gate plate, a valve seat and a sealing assembly, the valve seat is arranged between the gate plate and the valve body; the spring is arranged between the valve seat and the valve body; the sealing assembly is arranged on the side, facing the gate plate, of the valve seat and comprises a first sealing ring and a second sealing ring, the second sealing ring is arranged on the outer side of the first sealing ring in the circumferential direction, and the first sealing ring abuts against the second sealing ring. The first sealing ring is made of polytetrafluoroethylene materials or nylon materials, and the second sealing ring is made of rubber materials. A composite sealing structure combining hard sealing and multiple soft sealing is adopted, the sealing performance of the gate valve can be improved, and the service life of the gate valve can be prolonged; the structure of the valve seat is matched with a sealing structure, installation is convenient, and installation precision and installation efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve manufacturing, in particular to a gate valve with a composite sealing structure. Background Art

[0002] A gate valve is a sliding valve whose closing part is a parallel gate. The valve body of a traditional gate valve has a gate inside, a valve seat is arranged between the gate and the valve body, a spring is arranged between the valve seat and the valve body, and the valve seat realizes hard sealing by contacting the metal surface of the gate with the metal surface of the gate through its metal surface. However, a simple hard sealing structure has high requirements on the surface flatness of the gate and the valve seat, and the sealing effect is limited. In addition, impurities enter the gap between the valve seat and the gate during the movement of the gate, which can easily scratch the sealing metal surface and cause the sealing structure to fail. Therefore, the current gate valve improves its sealing performance by adding a soft sealing structure between the valve seat and the gate. However, this type of soft sealing structure is relatively simple, and still has problems such as limited sealing effect and low installation positioning accuracy, which need to be improved. Utility Model Content

[0003] The purpose of the utility model is to solve the shortcomings of the prior art and to propose a gate valve with a composite sealing structure to improve the sealing effect and installation accuracy.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A gate valve with a composite sealing structure comprises a valve body, a gate plate, a valve seat and a sealing assembly, wherein the gate plate is liftably arranged in the valve body; the valve seat is arranged between the gate plate and the valve body; the sealing assembly is arranged on the side of the valve seat facing the gate plate, and the sealing assembly comprises a first sealing ring and a second sealing ring, wherein the second sealing ring is arranged on the circumferential outer side of the first sealing ring, and the first sealing ring is close to the second sealing ring.

[0006] The valve seat is provided with a first sealing surface on the side facing the gate plate, the first sealing ring is provided with a second sealing surface on the side facing the gate plate, and the second sealing ring is provided with a third sealing surface on the side facing the gate plate. The distance between the second sealing surface and the gate plate is smaller than the distance between the first sealing surface and the gate plate, and the third sealing surface is in close contact with the gate plate.

[0007] Preferably, a first sealing groove and a second sealing groove are provided on the valve seat, the first sealing groove is connected to the second sealing groove, the structure of the first sealing groove matches the structure of the first sealing ring, and the first sealing ring is correspondingly arranged in the first sealing groove; the structure of the second sealing groove matches the structure of the second sealing ring, and the second sealing ring is correspondingly arranged in the second sealing groove.

[0008] Preferably, a first annular surface, a second annular surface and a connecting bevel connected between the first annular surface and the second annular surface are respectively provided on the side of the first sealing ring facing the second sealing ring, and the diameter of the first annular surface is larger than the diameter of the second annular surface; a limiting bevel is provided between the first sealing groove and the second sealing groove, the connecting bevel is abutted against the limiting bevel, and the first annular surface is abutted against the second sealing ring.

[0009] Preferably, a chamfered surface is provided between the second sealing surface and the first annular surface.

[0010] Preferably, the cross section of the second sealing ring is a triangle, and the three corners of the triangle are rounded corners, and the third sealing surface corresponds to one of the rounded corners of the triangle.

[0011] Preferably, the sealing assembly also includes a third sealing ring, which is arranged on the side of the valve seat facing the gate plate, and the third sealing ring is located circumferentially outside the second sealing ring; the third sealing ring has an inner sealing lip and an outer sealing lip, and the inner sealing lip and the outer sealing lip are tightly fitted with the gate plate respectively.

[0012] Preferably, a third sealing groove is provided on the valve seat, the structure of the third sealing groove matches the structure of the third sealing ring, and the third sealing ring is correspondingly arranged in the third sealing groove.

[0013] Preferably, a fourth sealing ring is provided between the valve seat and the valve body.

[0014] Preferably, a spring is provided between the valve seat and the valve body, and a central axis of the spring is perpendicular to the gate plate.

[0015] Preferably, the first sealing ring is made of polytetrafluoroethylene or nylon, and the second sealing ring is made of rubber.

[0016] Compared with the prior art, the beneficial effects of the utility model are as follows: the utility model adopts a composite sealing structure combining hard seals and multiple soft seals, which can improve the sealing performance of the gate valve and extend the service life of the gate valve; the structure of the valve seat and the sealing structure are designed in a coordinated manner, which is convenient for installation and can improve installation accuracy and efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A cross-sectional view of a gate valve according to an embodiment of the present utility model;

[0018] Figure 2 for Figure 1 A magnified view of the structure at center A;

[0019] Figure 3It is a cross-sectional view of a valve seat and a sealing assembly in one embodiment of the utility model;

[0020] Figure 4 It is a cross-sectional view of a sealing assembly in one embodiment of the utility model;

[0021] Figure 5 It is a cross-sectional view of a valve seat in one embodiment of the utility model;

[0022] Figure 6 It is a cross-sectional view of a valve seat and a sealing assembly in another embodiment of the present invention.

[0023] In the figure, 100-gate valve, 10-valve body, 11-fluid channel, 20-gate plate, 30-valve seat, 31-first sealing surface, 32-first sealing groove, 33-second sealing groove, 34-limiting inclined surface, 35-third sealing groove, 36-fourth sealing ring, 37-spring, 40-sealing assembly, 41-first sealing ring, 411-second sealing surface, 412-first annular surface, 413-second annular surface, 414-connecting inclined surface, 415-chamfered surface, 42-second sealing ring, 421-third sealing surface, 43-third sealing ring, 431-inner sealing lip, 432-outer sealing lip. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the embodiment of the present application will be clearly and completely described below in conjunction with the drawings of the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all the embodiments. Based on the described embodiment of the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application. It can be understood that, in the absence of conflict, some technical means of the various embodiments described herein can be replaced or combined with each other.

[0025] In the description of this application, if there are terms such as "first", "second", etc., they are only used to distinguish the objects described and do not have any order or technical meaning. Therefore, an object defined as "first", "second", etc. may explicitly or implicitly include one or more of the objects. In addition, "one" or "a" and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one, and "multiple" means no less than two.

[0026] In the description of the specification of the present application, reference to "one embodiment" or "some embodiments" etc. means that one or more embodiments of the present application include a specific feature, structure or characteristic described in conjunction with the embodiment. Therefore, the phrases "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments", etc. appearing in different places in the specification do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0027] Please refer to Figures 1 to 5 The utility model provides a gate valve 100 with a composite sealing structure, which includes a valve body 10, a gate plate 20, a valve seat 30 and a sealing assembly 40. The gate plate 20 is arranged in the valve body 10 in a manner that it can be raised and lowered. Fluid channels 11 are respectively arranged on both sides of the valve body 10. The gate plate 20 is correspondingly provided with through holes that match the fluid channels 11. When the gate plate 20 moves until the through holes are aligned with the fluid channels 11, the gate valve 100 is in a fully open state. It should be understood that the implementation structure of the lifting movement of the gate plate 20 in the gate valve 100 can adopt existing technologies. For example, the gate plate 20 can be threadedly connected to the valve stem, and the valve stem is then connected to a driving mechanism. The driving mechanism can adopt products such as motors. The driving mechanism drives the valve stem to rotate. Based on the threaded matching structure of the valve stem and the gate plate 20, the valve stem drives the gate plate 20 to lift and lower.

[0028] Reference Figure 2 The valve seat 30 is arranged between the gate plate 20 and the valve body 10, and the sealing assembly 40 is arranged on the side of the valve seat 30 facing the gate plate 20. The valve seat 30 and the sealing assembly 40 cooperate to achieve the sealing of the gate valve 100, so as to prevent the fluid or impurities from entering other components in the gate valve 100 along the gap between the gate plate 20 and the valve seat 30 and affecting the service life of the gate valve 100. Specifically, the sealing assembly 40 includes a first sealing ring 41 and a second sealing ring 42, and the second sealing ring 42 is arranged on the circumferential outer side of the first sealing ring 41, and the first sealing ring 41 is close to the second sealing ring 42. Among them, the first sealing ring 41 and the second sealing ring 42 are both arranged around the fluid channel 11, and are used to perform all-round sealing in the circumferential direction of the fluid channel 11.

[0029] Combined with reference Figure 2 and Figure 3The valve seat 30 is provided with a first sealing surface 31 on the side facing the gate plate 20, the first sealing ring 41 is provided with a second sealing surface 411 on the side facing the gate plate 20, and the second sealing ring 42 is provided with a third sealing surface 421 on the side facing the gate plate 20. The distance between the second sealing surface 411 and the gate plate 20 is smaller than the distance between the first sealing surface 31 and the gate plate 20, and the third sealing surface 421 is close to the gate plate 20, that is, the first sealing ring 41 emerges from the valve seat 30, and the second sealing ring 42 protrudes from the first sealing ring 41. In this way, the valve seat 30 can block some impurities from invading between the valve seat 30 and the gate plate 20, the first sealing ring 41 can block impurities with smaller sizes, and the second sealing ring 42 can completely block the fluid or impurities, thereby ensuring the sealing performance and preventing the fluid or impurities from entering other components in the gate valve 100; at the same time, the first sealing surface 31 and the second sealing surface 411 are not in direct contact with the gate plate 20, avoiding friction damage, which helps to extend the service life of the gate valve 100.

[0030] It should be noted that the distance between the first sealing surface 31 and the gate plate 20 and the distance between the second sealing surface 411 and the gate plate 20 can be reasonably set according to actual conditions, and the utility model does not limit this. For example, in one embodiment, the distance between the first sealing surface 31 and the gate plate 20 is 0.3 mm, and the distance between the second sealing surface 411 and the gate plate 20 is 0.2 mm. In this way, the valve seat can block impurities larger than 0.3 mm in size, and the second sealing ring can block impurities larger than 0.2 mm in size.

[0031] Reference Figure 2 As shown, a fourth sealing ring 36 is provided between the valve seat 30 and the valve body 10 to ensure the sealing between the valve seat 30 and the valve body 10 .

[0032] Furthermore, a spring 37 is provided between the valve seat 30 and the valve body 10, and the central axis of the spring 37 is perpendicular to the gate plate 20. The spring 37 is in a compressed state, and exerts a force on the valve seat 30 in the direction of the gate plate 20, so that the second sealing ring 42 can be close to the gate plate 20, thereby ensuring the sealing performance.

[0033] Reference Figures 3 to 5 In some embodiments, the valve seat 30 is provided with a first sealing groove 32 and a second sealing groove 33, the first sealing groove 32 is communicated with the second sealing groove 33, the structure of the first sealing groove 32 matches the structure of the first sealing ring 41, and the first sealing ring 41 is correspondingly arranged in the first sealing groove 32. The structure of the second sealing groove 33 matches the structure of the second sealing ring 42, and the second sealing ring 42 is correspondingly arranged in the second sealing groove 33. The first sealing ring 41 can press against the second sealing ring 42 to prevent the second sealing ring 42 from falling off.

[0034] Furthermore, the first sealing ring 41 is provided with a first annular surface 412, a second annular surface 413, and a connecting inclined surface 414 connected between the first annular surface 412 and the second annular surface 413 on one side thereof facing the second sealing ring 42. The diameter of the first annular surface 412 is greater than the diameter of the second annular surface 413, that is, the thickness of the first sealing ring 41 corresponding to the first annular surface 412 is greater than the thickness of the first sealing ring 41 corresponding to the second annular surface 413. A limiting inclined surface 34 is provided between the first sealing groove 32 and the second sealing groove 33, the connecting inclined surface 414 abuts against the limiting inclined surface 34, and the first annular surface 412 abuts against the second sealing ring 42. In this way, during the installation process, the second sealing ring 42 can be first installed into the second sealing groove 33, and then the first sealing ring 41 can be installed into the first sealing groove 32. After the first sealing ring 41 is pushed into the first sealing groove 32, the first sealing ring 41 can resist the second sealing ring 42 to prevent the second sealing ring 42 from shifting or falling off. The limiting slope 34 can limit the first sealing ring 41 to ensure installation accuracy and improve installation efficiency.

[0035] Furthermore, a chamfered surface 415 is provided between the second sealing surface 411 and the first annular surface 412 , which facilitates the assembly of the sealing assembly 40 and improves the assembly efficiency.

[0036] Reference Figure 3 and Figure 4 In some embodiments, the cross section of the second sealing ring 42 is a triangle, and the three corners of the triangle are rounded, and the third sealing surface 421 corresponds to one of the rounded corners of the triangle. Further, in one embodiment, the cross section of the second sealing ring 42 is an isosceles right triangle, and the three corners of the isosceles right triangle are rounded, and one of the right-angled sides of the isosceles right triangle is in close contact with the first annular surface 412, and the other right-angled side is parallel to the gate 20.

[0037] During manufacturing, the valve seat 30 and the gate plate 20 can be made of metal, the first sealing ring 41 can be made of polytetrafluoroethylene or nylon, and the second sealing ring 42 can be made of rubber. The composite sealing structure is easy to seal, can reduce the opening and closing force, reduce wear, and extend the service life of the product. In addition, the compressive strength of the first sealing ring 41 is greater than that of the second sealing ring 42, and the first sealing ring 41 can press against the second sealing ring 42 to prevent it from shifting.

[0038] Reference Figure 6In other embodiments, the sealing assembly 40 further includes a third sealing ring 43, which is disposed on the side of the valve seat 30 facing the gate plate 20, and the third sealing ring 43 is located on the circumferential outer side of the second sealing ring 42. The third sealing ring 43 has an inner sealing lip 431 and an outer sealing lip 432, and the inner sealing lip 431 and the outer sealing lip 432 are respectively tightly fitted with the gate plate 20. Correspondingly, a third sealing groove 35 is provided on the valve seat 30, and the structure of the third sealing groove 35 matches the structure of the third sealing ring 43, and the third sealing ring 43 is correspondingly disposed in the third sealing groove 35. Among them, the third sealing ring 43 can be made of rubber material, which is flexible and easy to seal, and has a small friction coefficient. The driving force required for opening and closing the gate valve 100 is small, which can reduce the manufacturing cost. When the gate valve 100 is working, the third sealing ring 43 can share the pressure from the fluid with the second sealing ring 42, thereby reducing the wear of the second sealing ring 42 and the third sealing ring 43, and extending the service life of the gate valve 100. Further sealing is achieved by the third sealing ring 43 . Even if the second sealing ring 42 fails, the third sealing ring 43 can still play a sealing role, thereby preventing fluid or impurities from invading other components in the gate valve 100 , thereby extending the service life of the gate valve 100 .

[0039] To sum up, the utility model provides a gate valve with a composite sealing structure, which adopts a composite sealing structure combining a hard seal with multiple soft seals, which can improve the sealing performance of the gate valve and extend the service life of the gate valve; the structure of the valve seat and the sealing structure are designed in a coordinated manner, which is convenient for installation and can improve installation accuracy and efficiency.

[0040] The present invention has been described by the above-mentioned relevant embodiments, however, the above-mentioned embodiments are only examples for implementing the present invention. It must be pointed out that the disclosed embodiments do not limit the scope of the present invention. On the contrary, any changes and modifications made without departing from the spirit and scope of the present invention are within the scope of patent protection of the present invention.

Claims

1. A gate valve with a composite sealing structure, characterized in that: The valve body comprises a valve body, a gate plate, a valve seat and a sealing assembly, wherein the gate plate is arranged in the valve body in a liftable manner; the valve seat is arranged between the gate plate and the valve body; the sealing assembly is arranged on the side of the valve seat facing the gate plate, and the sealing assembly comprises a first sealing ring and a second sealing ring, wherein the second sealing ring is arranged on the circumferential outer side of the first sealing ring, and the first sealing ring is close to the second sealing ring; The valve seat is provided with a first sealing surface on the side facing the gate plate, the first sealing ring is provided with a second sealing surface on the side facing the gate plate, and the second sealing ring is provided with a third sealing surface on the side facing the gate plate. The distance between the second sealing surface and the gate plate is smaller than the distance between the first sealing surface and the gate plate, and the third sealing surface is in close contact with the gate plate.

2. The gate valve with a composite sealing structure according to claim 1, characterized in that: The valve seat is provided with a first sealing groove and a second sealing groove, the first sealing groove is communicated with the second sealing groove, the structure of the first sealing groove matches the structure of the first sealing ring, and the first sealing ring is correspondingly arranged in the first sealing groove; the structure of the second sealing groove matches the structure of the second sealing ring, and the second sealing ring is correspondingly arranged in the second sealing groove.

3. The gate valve with a composite sealing structure according to claim 2, characterized in that: A first annular surface, a second annular surface, and a connecting inclined surface connected between the first annular surface and the second annular surface are respectively provided on the side of the first sealing ring facing the second sealing ring, and the diameter of the first annular surface is greater than the diameter of the second annular surface; a limiting inclined surface is provided between the first sealing groove and the second sealing groove, the connecting inclined surface is abutted against the limiting inclined surface, and the first annular surface is abutted against the second sealing ring.

4. The gate valve with a composite sealing structure as claimed in claim 3, characterized in that: A chamfered surface is provided between the second sealing surface and the first annular surface.

5. The gate valve with a composite sealing structure according to claim 1, characterized in that: The cross section of the second sealing ring is a triangle, and the three corners of the triangle are rounded corners respectively, and the third sealing surface corresponds to one of the rounded corners of the triangle.

6. The gate valve with a composite sealing structure according to claim 1, characterized in that: The sealing assembly also includes a third sealing ring, which is arranged on the side of the valve seat facing the gate plate, and the third sealing ring is located on the circumferential outside of the second sealing ring; the third sealing ring has an inner sealing lip and an outer sealing lip, and the inner sealing lip and the outer sealing lip are tightly fitted with the gate plate respectively.

7. The gate valve with a composite sealing structure according to claim 6, characterized in that: The valve seat is provided with a third sealing groove, the structure of the third sealing groove matches the structure of the third sealing ring, and the third sealing ring is correspondingly arranged in the third sealing groove.

8. The gate valve with a composite sealing structure according to any one of claims 1 to 7, characterized in that: A fourth sealing ring is provided between the valve seat and the valve body.

9. The gate valve with a composite sealing structure according to any one of claims 1 to 7, characterized in that: A spring is arranged between the valve seat and the valve body, and a central axis of the spring is perpendicular to the gate plate.

10. The gate valve with a composite sealing structure according to any one of claims 1 to 7, characterized in that: The first sealing ring is made of polytetrafluoroethylene or nylon, and the second sealing ring is made of rubber.

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