Sealing ball valve

Abstract

The utility model provides a sealing ball valve which comprises a valve body, a valve cover, a valve rod and a ball body, the valve rod is in linkage connection with the ball body, a valve rod sealing groove is formed among the valve body, the valve cover and the valve rod, and a valve rod sealing assembly is arranged in the valve rod sealing groove. The valve rod sealing assembly comprises a first sealing ring, a sealing block, a second sealing ring, a third sealing ring and a fourth sealing ring, the first sealing ring is a graphite packing sealing ring, the second sealing ring is provided with a first sealing lip and a second sealing lip, the first sealing lip is tightly attached to the valve rod and the valve body, and the second sealing lip is tightly attached to the valve body; the third sealing ring is arranged on the inner side portion of the sealing block and located between the valve rod and the sealing block. The fourth sealing ring is arranged on the outer side portion of the sealing block and located between the sealing block and the valve body. The valve rod sealing assembly adopts a composite sealing mode, so that the sealing performance of the valve rod can be effectively improved, the failure of a sealing structure is avoided, the service life of the ball valve is prolonged, and the safety of a fluid control system is ensured.

Description

Technical Field

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

[0002] A ball valve is a valve whose opening and closing part (ball) is driven by the valve stem and rotates around the axis of the ball valve. It has a 90-degree rotation action, and the plug body is a sphere with a circular through hole or channel passing through its axis. Ball valves are widely used in oil refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal administration, steel and other industries, and occupy a pivotal position in the national economy.

[0003] Valve sealing is the key to the safe and stable operation of fluid control systems, mainly including the contact between the opening and closing parts and the valve seat, the matching between the valve body and the valve stem, etc. At present, the main sealing methods for ball valve stems are packing seals and elastic seals. The packing seal method mainly fills the sealing material between the valve stem and the valve body to achieve sealing, and the elastic seal mainly achieves sealing by setting an O-ring between the valve stem and the valve body. However, during the operation of the ball valve, the valve stem will indirectly bear the impact force from the fluid. At this time, the sealing effect of a simple packing seal or O-ring sealing structure is limited, which can easily lead to leakage at the valve stem, affecting the safety of the fluid control system. Summary of the invention

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a sealing ball valve to enhance the sealing performance of the ball valve.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a sealed ball valve, which comprises a valve body, a valve cover, a valve stem and a ball. The ball is arranged inside the valve body, the valve cover is arranged on the valve body, the valve stem is penetrated by the valve cover and the valve body, and the valve stem is linked to the ball. A valve stem sealing groove is formed between the valve body, the valve cover and the valve stem, and a valve stem sealing component is arranged in the valve stem sealing groove.

[0007] The valve stem sealing assembly includes a first sealing ring, a sealing block, a second sealing ring, a third sealing ring and a fourth sealing ring. The first sealing ring, the sealing block and the second sealing ring are respectively arranged in sequence from top to bottom along the axial direction of the valve stem. The second sealing ring is a double-lip sealing ring. The second sealing ring has a first sealing lip and a second sealing lip. The first sealing lip is tightly against the valve stem and the valve body, and the second sealing lip is tightly against the valve body. The third sealing ring is arranged on the inner side of the sealing block, and the third sealing ring is located between the valve stem and the sealing block. The fourth sealing ring is arranged on the outer side of the sealing block, and the fourth sealing ring is located between the sealing block and the valve body.

[0008] Preferably, the valve stem sealing assembly also includes a grease injection joint, which is arranged on the side of the valve body, the valve body is provided with a first grease injection channel, and the sealing block is correspondingly provided with a second grease injection channel, and the first grease injection channel is connected between the grease injection joint and the second grease injection channel.

[0009] Preferably, a first grease injection sealing groove and a second grease injection sealing groove are respectively provided at both ends of the second grease injection channel, the first grease injection sealing groove is close to the valve stem, and the second grease injection sealing groove is close to the valve body.

[0010] Preferably, a valve seat sealing assembly is provided between the ball and the valve body, and the valve seat sealing assembly includes a valve seat, a spring, a fifth sealing ring and a sixth sealing ring. The valve seat is provided between the ball and the valve body, the spring is provided between the valve seat and the valve body, the fifth sealing ring is provided on the valve seat and located between the ball and the valve seat, and the sixth sealing ring is provided between the valve seat and the valve body.

[0011] Preferably, a side surface of the valve seat facing the sphere is an arc-shaped surface, and an arc-shaped contour of the arc-shaped surface matches an arc-shaped contour of the sphere.

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

[0013] Preferably, the fifth sealing ring has a main body and a protruding portion, the main body is embedded in the mounting groove, and the protruding portion protrudes from the sealing groove and is tightly attached to the ball.

[0014] Preferably, the first sealing ring is a graphite packing sealing ring.

[0015] Preferably, the second sealing ring is made of plastic or rubber.

[0016] Preferably, the third sealing ring and the fourth sealing ring are respectively made of rubber material.

[0017] Compared with the prior art, the beneficial effects of the utility model are as follows: in the sealed ball valve of the utility model, a valve stem sealing groove is formed between the valve body, the valve cover and the valve stem, and a valve stem sealing assembly is arranged in the valve stem sealing groove. The valve stem sealing assembly adopts a composite sealing method, which can effectively improve the sealing performance at the valve stem, avoid failure of the sealing structure, extend the service life of the ball valve, and ensure the safety of the fluid control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A half-section view of a sealing ball valve according to some embodiments of the utility model;

[0019] Figure 2 for Figure 1 The cross-section at A in the middle;

[0020] Figure 3 It is a cross-sectional view of the valve stem sealing assembly in some embodiments of the utility model;

[0021] Figure 4 for Figure 1 The cross-section at point B in the middle;

[0022] Figure 5 It is a cross-sectional view of the valve seat sealing assembly in some embodiments of the present invention.

[0023] In the figure, 10-valve body, 11-first grease injection channel, 20-valve cover, 30-valve stem, 31-valve stem sealing groove, 40-ball, 50-valve stem sealing assembly, 51-first sealing ring, 52-sealing block, 521-second grease injection channel, 522-first grease injection sealing groove, 523-second grease injection sealing groove, 53-second sealing ring, 531-first sealing lip, 532-second sealing lip, 54-third sealing ring, 55-fourth sealing ring, 56-grease injection connector, 60-valve seat sealing assembly, 61-valve seat, 611-installing groove, 612-exhaust hole, 62-spring, 63-fifth sealing ring, 631-main body, 632-protrusion, 64-sixth sealing ring. 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 3 The utility model provides a sealed ball valve, which includes a valve body 10, a valve cover 20, a valve stem 30 and a ball 40. The ball 40 is arranged inside the valve body 10, the valve cover 20 is arranged on the valve body 10, the valve stem 30 is penetrated by the valve cover 20 and the valve body 10, and the valve stem 30 is linked to the ball 40. A valve stem sealing groove 31 is formed between the valve body 10, the valve cover 20 and the valve stem 30, and a valve stem sealing assembly 50 is arranged in the valve stem sealing groove 31. The valve stem sealing assembly 50 is used to ensure the sealing between the valve body 10, the valve cover 20 and the valve stem 30.

[0028] Specifically, the valve stem seal assembly 50 includes a first seal ring 51, a seal block 52, a second seal ring 53, a third seal ring 54 and a fourth seal ring 55. The first seal ring 51, the seal block 52 and the second seal ring 53 are arranged in sequence from top to bottom along the axial direction of the valve stem 30, and the first seal ring 51, the seal block 52 and the second seal ring 53 surround the valve stem 30 respectively. The second seal ring 53 is a double-lip seal ring, and the second seal ring 53 has a first seal lip 531 and a second seal lip 532. The lip opening of the second seal ring 53 (the opening between the first seal lip 531 and the second seal lip 532) faces downward, and the first seal lip 531 is relatively located on the inner side of the second seal lip 532. The first seal lip 531 is in close contact with the valve stem 30 and the valve body 10, and the second seal lip 532 is in close contact with the valve body 10. The third seal ring 54 is arranged on the inner side of the seal block 52, and the third seal ring 54 is located between the valve stem 30 and the seal block 52. The fourth sealing ring 55 is disposed on the outer side of the sealing block 52 , and the fourth sealing ring 55 is located between the sealing block 52 and the valve body 10 .

[0029] In different embodiments, the first sealing ring 51 can adopt a packing sealing method, and the packing material can be reasonably selected according to different working conditions, such as polytetrafluoroethylene, flexible graphite, polyimide, etc. For example, in one embodiment, the first sealing ring 51 is a graphite packing sealing ring, which has the advantages of high temperature resistance and corrosion resistance, and can be applied to a variety of working conditions. The sealing block 52 can be made of the same material as the valve body 10 or the valve stem 30, and the separate sealing block 52 and the valve stem 30 are hard sealed. The second sealing ring 53, the third sealing ring 54, and the fourth sealing ring 55 can respectively adopt elastic sealing methods, for example, plastic or rubber materials. In one embodiment, the second sealing ring 53 is made of plastic material, and the third sealing ring 54 and the fourth sealing ring 55 are respectively O-rings made of rubber material.

[0030] When the above-mentioned sealing ball valve is in operation, the impact force of the fluid indirectly acts on the valve stem 30, and the valve stem 30 may apply axial or radial pressure to the second sealing ring 53. The axial pressure from the valve stem 30 can push the second sealing ring 53 upward, and the lip of the second sealing ring 53 opens under the action of pressure, so that the first sealing lip 531 is more closely attached to the valve stem 30 and the valve body 10, and the second sealing lip 532 is more closely attached to the valve body 10; the radial pressure from the valve stem 30 can push the second sealing ring 53 toward the valve body 10, so that the second sealing ring 53 is compressed, thereby making the first sealing lip 531 more closely attached to the valve stem 30 and the valve body 10, and the second sealing lip 532 is more closely attached to the valve body 10. In this way, the sealing performance at the valve stem 30 can be effectively enhanced, fluid leakage can be avoided, the service life of the ball valve can be extended, and the safety of the fluid control system can be ensured. In addition, the second sealing ring 53, the sealing block 52, the third sealing ring 54, the fourth sealing ring 55 and the first sealing ring 51 form a composite sealing method and constitute a multiple sealing structure, which further improves the sealing performance at the valve stem 30, can avoid failure of the sealing structure, extend the service life of the ball valve, and ensure the safety of the fluid control system.

[0031] Reference Figure 2 and Figure 3In some embodiments, the valve stem sealing assembly 50 further includes a grease injection joint 56, which is disposed on the side of the valve body 10. The valve body 10 is provided with a first grease injection channel 11, and the sealing block 52 is correspondingly provided with a second grease injection channel 521. The first grease injection channel 11 is connected between the grease injection joint 56 and the second grease injection channel 521. In one embodiment, the second grease injection channel 521 is located between the first sealing ring 51 and the third sealing ring 54. In some cases, sealing grease can be injected into the first grease injection channel 11 and the second grease injection channel 521 through the grease injection joint 56 to fill the tiny gap at the valve stem, further enhance the sealing of the ball valve, and avoid fluid leakage; the sealing grease can be a commercially available sealing grease material, which can reduce the wear and corrosion of the valve stem surface, extend the service life of the ball valve, and reduce the maintenance cost to a certain extent. In other cases, when the valve stem seal causes leakage due to abrasion, sealing grease can be urgently injected into the first grease injection channel 11 and the second grease injection channel 521 to play an instantaneous sealing role, thereby reducing the safety risk as much as possible.

[0032] Reference Figure 3 In some embodiments, a first grease injection sealing groove 522 and a second grease injection sealing groove 523 are respectively provided at both ends of the second grease injection channel 521, wherein the first grease injection sealing groove 522 is close to the valve stem 30, and the second grease injection sealing groove 523 is close to the valve body 10. In the direction parallel to the central axis of the valve stem 30, the heights of the first grease injection sealing groove 522 and the second grease injection sealing groove 523 are greater than the height of the main part of the second grease injection channel 521, and the first grease injection sealing groove 522 and the second grease injection sealing groove 523 can be used to accommodate more sealing grease to ensure the sealing between the sealing block 52 and the valve stem 30 and the sealing between the sealing block 52 and the valve body 10.

[0033] Please refer to Figure 1 , Figure 4 and Figure 5In some embodiments, a valve seat sealing assembly 60 is provided between the ball 40 and the valve body 10, and the valve seat sealing assembly 60 includes a valve seat 61, a spring 62, a fifth sealing ring 63 and a sixth sealing ring 64. The valve seat 61 is provided between the ball 40 and the valve body 10, the spring 62 is provided between the valve seat 61 and the valve body 10, the fifth sealing ring 63 is provided on the valve seat 61 and is located between the ball 40 and the valve seat 61, and the sixth sealing ring 64 is provided between the valve seat 61 and the valve body 10. The central axis of the spring 62 is along the radial direction of the valve stem 30, and the spring 62 is in a compressed state between the valve seat 61 and the valve body 10. Therefore, the spring 62 has a thrust on the valve seat 10 in the direction of the ball, so that the fifth sealing ring 63 on the valve seat 61 can be close to the ball 40 to ensure the sealing at the ball 40; the sixth sealing ring 64 is used to ensure the sealing between the valve seat 61 and the valve body 10. The fifth sealing ring 63 and the sixth sealing ring 64 can be made of materials such as rubber, etc., and the structures of the fifth sealing ring 63 and the sixth sealing ring 64 can be reasonably set according to actual needs.

[0034] In some embodiments, a side surface of the valve seat 61 facing the sphere 40 is an arc-shaped surface, and the arc-shaped contour of the arc-shaped surface matches the arc-shaped contour of the sphere 40 .

[0035] Furthermore, a mounting groove 611 is provided on the valve seat 61 , the structure of the mounting groove 611 matches the structure of the fifth sealing ring 63 , and the fifth sealing ring 63 is disposed in the mounting groove 611 .

[0036] Furthermore, the fifth sealing ring 63 has a main body 631 and a protrusion 632, the main body 631 is embedded in the installation groove 611, and the protrusion 632 emerges from the sealing groove 611 and is in close contact with the ball 40. In this way, there can be a small gap between the arc surface of the valve seat 61 and the arc surface of the ball 40 to avoid direct contact between the two and cause wear of the sealing surface; the protrusion 632 is in close contact with the ball 40, which can prevent fluid or impurities from leaking from between the valve seat 61 and the ball 40; in addition, the fifth sealing ring 63 is made of rubber material, which is a soft sealing method with a small friction coefficient, which can avoid scratching the ball 40 and achieve a better sealing effect.

[0037] Reference Figure 5 In some other embodiments, a vent hole 612 is provided on the valve seat 61 . The vent hole 612 penetrates the valve seat 61 , which can facilitate the installation of the valve seat sealing assembly 60 .

[0038] In the sealed ball valve of the utility model, a stem sealing groove is formed between the valve body, the valve cover and the valve stem, and a stem sealing assembly is arranged in the stem sealing groove. The stem sealing assembly adopts a composite sealing method, which can effectively improve the sealing performance of the valve stem, avoid failure of the sealing structure, extend the service life of the ball valve, and ensure the safety of the fluid control system.

[0039] 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 sealed ball valve, characterized in that: The sealed ball valve comprises a valve body, a valve cover, a valve stem and a ball, wherein the ball is arranged inside the valve body, the valve cover is arranged on the valve body, the valve stem is penetrated through the valve cover and the valve body, and the valve stem is linked to the ball; a valve stem sealing groove is formed between the valve body, the valve cover and the valve stem, and a valve stem sealing assembly is arranged in the valve stem sealing groove; The valve stem sealing assembly includes a first sealing ring, a sealing block, a second sealing ring, a third sealing ring and a fourth sealing ring. The first sealing ring, the sealing block and the second sealing ring are respectively arranged in sequence from top to bottom along the axial direction of the valve stem. The second sealing ring is a double-lip sealing ring. The second sealing ring has a first sealing lip and a second sealing lip. The first sealing lip is tightly against the valve stem and the valve body, and the second sealing lip is tightly against the valve body. The third sealing ring is arranged on the inner side of the sealing block, and the third sealing ring is located between the valve stem and the sealing block. The fourth sealing ring is arranged on the outer side of the sealing block, and the fourth sealing ring is located between the sealing block and the valve body.

2. The sealed ball valve according to claim 1, characterized in that: The valve stem sealing assembly also includes a grease injection joint, which is arranged on the side of the valve body. The valve body is provided with a first grease injection channel, and the sealing block is correspondingly provided with a second grease injection channel. The first grease injection channel is connected between the grease injection joint and the second grease injection channel.

3. The sealed ball valve according to claim 2, characterized in that: A first grease injection sealing groove and a second grease injection sealing groove are respectively provided at two ends of the second grease injection channel, the first grease injection sealing groove is close to the valve stem, and the second grease injection sealing groove is close to the valve body.

4. The sealed ball valve according to claim 1, characterized in that: A valve seat sealing assembly is provided between the ball and the valve body, and the valve seat sealing assembly includes a valve seat, a spring, a fifth sealing ring and a sixth sealing ring. The valve seat is provided between the ball and the valve body, the spring is provided between the valve seat and the valve body, the fifth sealing ring is provided on the valve seat and located between the ball and the valve seat, and the sixth sealing ring is provided between the valve seat and the valve body.

5. The sealed ball valve according to claim 4, characterized in that: A side surface of the valve seat facing the sphere is an arc-shaped surface, and the arc-shaped contour of the arc-shaped surface matches the arc-shaped contour of the sphere.

6. The sealed ball valve according to claim 4, characterized in that: The valve seat is provided with a mounting groove, the structure of which matches that of the fifth sealing ring, and the fifth sealing ring is arranged in the mounting groove.

7. The sealed ball valve according to claim 6, characterized in that: The fifth sealing ring comprises a main body and a protruding portion, wherein the main body is embedded in the mounting groove, and the protruding portion protrudes from the sealing groove and is in close contact with the ball.

8. The sealed ball valve according to any one of claims 1 to 7, characterized in that: The first sealing ring is a graphite packing sealing ring.

9. The sealed ball valve according to any one of claims 1 to 7, characterized in that: The second sealing ring is made of plastic or rubber.

10. The sealed ball valve according to any one of claims 1 to 7, characterized in that: The third sealing ring and the fourth sealing ring are respectively made of rubber.

Images