CN212536731U

CN212536731U - Novel pressure self-balancing seal structure

Info

Publication number: CN212536731U
Application number: CN202021466546.3U
Authority: CN
Inventors: 瞿辉; 吴楠; 包勇超
Original assignee: Yangzhong Valve Factory Co ltd
Current assignee: Yangzhong Valve Factory Co ltd
Priority date: 2020-07-23
Filing date: 2020-07-23
Publication date: 2021-02-12
Anticipated expiration: 2030-07-23

Abstract

The utility model discloses a novel pressure self-balancing sealing structure, which comprises a valve body and a valve clack, wherein the valve clack is fixedly arranged in the valve body, the outer wall of the valve clack is provided with a sealing component, the sealing component comprises a gasket and a sealing ring, the sealing ring comprises a finger-shaped spring and a sealing layer, a cushion block is fixedly arranged above the finger-shaped spring and positioned in the valve body, a valve rod is fixedly inserted and connected at the top of the valve clack, a valve cover is fixedly arranged at the top of the valve body, a packing pressing plate is fixedly arranged on the surface of the valve rod and positioned in the valve cover, an eyelet bolt is pinned at one side of the valve cover and is in threaded connection with the packing pressing plate, a guide block is slidably arranged at one side of the valve cover and is fixedly arranged on the surface of the valve rod through a, the operating torque is small, the cost is low and the installation is convenient.

Description

Novel pressure self-balancing seal structure

Technical Field

The utility model relates to a valve body technical field, concretely relates to novel pressure self-balancing seal structure.

Background

The valve is an indispensable important mechanical product on pressure pipelines such as petrochemical industry, oil field, metallurgy, thermal power, nuclear power, ships and warships and the like, and because in the use process of the prior valve technical product, on one hand, the valve can be opened and closed only by overcoming the medium pressure borne by the opening and closing part, when the valve is used for high-temperature, high-pressure and large-diameter pipelines, the medium pressure not only causes the valve to be very difficult to open and close, but also easily causes the damage and the leakage of the sealing surface of the valve; on the other hand, the internal leakage condition of the valve is very common, and because the high-temperature and high-pressure valve is connected to the pipeline in a welding mode, the valve in the prior art cannot be maintained on line after leakage, and only can be cut again and welded with a new valve again, so that the valve is time-consuming, labor-consuming and costly to maintain.

The pressure self-balancing valve can enable the medium pressure acting on the opening and closing piece to be self-balanced through a pressure self-balancing principle, and fundamentally eliminates the influence of the medium pressure on the aspects of the operation performance, the sealing quality, the sealing service life and the like of the valve. The pressure self-balancing valve is an important way for transformation and upgrading of the existing valve product, and the key technology for realizing the pressure self-balancing stop valve is sealing of a pressure self-balancing structure. The sealing technology of the existing pressure self-balancing structure generally adopts O-shaped and Y-shaped sealing rings for sealing, and the sealing technology can convert medium pressure into pressure self-sealing of the sealing rings to media, so that the sealing pretightening force of the sealing rings can obtain a very good sealing effect without being very large, and in the using process of the sealing rings, the sealing effect of the sealing rings is not only irrelevant to the level of the medium pressure, but also is not changed along with the reduction of the sealing pretightening force after the sealing rings are abraded, so that the sealing technology has lasting and reliable sealing quality and sealing service life. Because the high-density elastic materials which can be used for manufacturing O-shaped and Y-shaped sealing rings are all rubber, plastic and the like which are not high in temperature resistance at present, the existing pressure self-balancing stop valve is only suitable for medium environments below 200 ℃ and cannot be used for high-temperature pressure pipelines with wide areas and large quantities, such as steam and the like, zero leakage of a valve is difficult to achieve, the diameter of a valve rod needs to be increased, the operation model of a gear box needs to be enlarged, the operation torque is large, and the cost is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel pressure self-balancing seal structure changes the present high density elastic material who uses sealing washers such as "O" type, "Y" type and utilizes finger spring and sealing layer cooperation to use as seal structure, can adapt to certain high pressure and high temperature state and can not produce deformation, need not to increase valve rod diameter or increase gear box operation model, and operating torque is little, and is with low costs and be convenient for install to solve the problem that proposes in the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme:

a novel pressure self-balancing sealing structure comprises a valve body and a valve clack, wherein the valve clack is fixedly arranged in the valve body, a sealing assembly is arranged on the outer wall of the valve clack, the sealing assembly comprises a gasket and a sealing ring, the sealing ring comprises a finger-shaped spring and a sealing layer, a cushion block is fixedly arranged above the finger-shaped spring and positioned in the valve body, a valve rod is fixedly inserted and connected to the top of the valve clack, a valve cover is fixedly arranged at the top of the valve body, a packing pressing plate is fixedly arranged on the surface of the valve rod and positioned in the valve cover, an eyelet bolt is connected to;

a guide block is slidably mounted on one side of the valve cover and fixedly mounted on the surface of the valve rod through a screw, a valve rod nut is arranged on the top of the valve cover, and a round nut is connected to the surface of the valve rod nut through threads.

The valve comprises a valve body, a valve cover, a valve rod, a nut and a through hole, wherein the valve cover is internally provided with a through hole at the position where the valve rod penetrates through, and the valve rod is fixedly provided with the nut at one end inside the valve body.

And one end of the swing bolt is inserted with a pin shaft, and two ends of the pin shaft are inserted with cotter pins.

Wherein, valve body and valve gap hookup location symmetry and fixed mounting have stud, stud one end is located valve gap top threaded connection and has lock nut, valve body and valve gap hookup location are provided with the winding gasket.

The hand wheel is fixedly mounted at the top of the valve rod, the upper surface of the hand wheel is fixedly mounted on the nameplate, and the upper surface of the nameplate is fixedly mounted at the top end of the valve rod and provided with the round nut.

The packing pressing plate comprises a pressing plate and a packing layer filled at the bottom in the pressing plate, and the packing layer is of a flexible graphite layer structure.

Wherein, the surface of the valve clack is fixedly provided with a guide sleeve at the bottom of the sealing layer.

The valve body comprises a first cavity and a second cavity, and the first cavity is communicated with the valve clack.

And flanges are arranged on one sides of the first cavity and the second cavity.

To sum up, owing to adopted above-mentioned technique, the beneficial effects of the utility model are that:

the utility model discloses in, set gradually packing ring, seal assembly and uide bushing between valve clack and valve body, be different from current high density elastic material with sealing washer such as "O" type, "Y" type and use as seal structure with the cooperation of sealing layer, utilize finger spring and sealing layer, can adapt to certain high pressure and high temperature state and can not produce deformation, need not to increase valve rod diameter or increase gear box operation model, operating torque is little, with low costs and be convenient for the installation.

Drawings

Fig. 1 is a schematic view of a front sectional structure of a novel pressure self-balancing sealing structure of the present invention;

fig. 2 is a schematic structural view of a part a in fig. 1 of a novel pressure self-balancing sealing structure of the present invention;

fig. 3 is a schematic structural diagram of part B in fig. 2 of a novel pressure self-balancing sealing structure of the present invention.

In the figure: 1. a valve body; 101. a first cavity; 102. a second cavity; 2. a valve flap; 3. a seal assembly; 301. a gasket; 302. a seal ring; 3021. a finger spring; 3022. a sealing layer; 4. cushion blocks; 5. a valve cover; 7. a nut; 8. a valve stem; 9. a packing press plate; 901. pressing a plate; 902. a filler layer; 14. an eye bolt; 15. a pin shaft; 17. a guide block; 18. a stud bolt; 19. locking the nut; 20. a valve stem nut; 21. a first round nut; 22. a hand wheel; 23. a nameplate; 24. a second round nut; 25. a guide sleeve; 26. a flange; 27. and (6) winding the gasket.

Detailed Description

To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the drawings of the embodiments of the present invention are combined to clearly and completely describe the technical solutions of the embodiments of the present invention, and obviously, the described embodiments are some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplification of description, and do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific situation of the specification.

The utility model provides a novel pressure self-balancing seal structure as shown in fig. 1-3, including valve body 1 and valve clack 2, valve clack 2 fixed mounting is in valve body 1, valve clack 2 outer wall is provided with seal assembly 3, seal assembly 3 includes packing ring 301 and sealing washer 302, sealing washer 302 includes finger spring 3021 and sealing layer 3022, sets up finger spring 3021 and cooperates the sealing layer 3022 that finger spring 3021 bottom set up, not only can carry out the sealing of valve body 1 and finger spring 3021 has certain anti-pressure ability, is difficult for producing deformation, and can not receive high temperature to influence; a cushion block 4 is fixedly arranged above the finger spring 3021 in the valve body 1, a valve rod 8 is fixedly inserted and connected to the top of the valve clack 2, a valve cover 5 is fixedly arranged on the top of the valve body 1, a packing pressing plate 9 is fixedly arranged on the surface of the valve rod 8 in the valve cover 5, a swing bolt 14 is connected to one side of the valve cover 5 in a pin joint mode, a pin shaft 15 is inserted and connected to one end of the swing bolt 14, split pins are inserted and connected to two ends of the pin shaft 15, and the pin shaft 15 is fixedly connected to the inside of the swing bolt; the movable joint bolt 14 is in threaded connection with the packing pressing plate 9, the packing pressing plate 9 comprises a pressing plate 901 and a packing layer 902 filled at the bottom in the pressing plate 901, the packing layer 902 is of a flexible graphite layer structure, and the flexible graphite layer is used as a novel functional carbon material and has the characteristics of softness, compression resilience, adsorptivity, ecological environment coordination, biocompatibility, radiation resistance and the like which are not possessed by natural graphite besides excellent performances of cold and heat resistance, corrosion resistance, self-lubrication and the like of the natural graphite.

5 one side slidable mounting of valve gap has guide block 17, guide block 17 passes through screw fixed mounting in the valve rod 8 surface, 8 top fixed mounting of valve rod have hand wheel 22, fixed surface installs in data plate 23 on the hand wheel 22, data plate 23 upper surface is located 8 top fixed mounting of valve rod has second

round nut

24, 5 tops of valve gap are provided with valve nut 20, valve nut 20 surface threaded connection has first round nut 21, it has seted up the through-hole to be located valve rod 8 running through position in the valve gap 5, valve rod 8 is located 1 inside one end fixed mounting of valve body has nut 7, sets up nut 7 and valve rod 8 and is the three spot welding connected mode, guarantees connection structure's stability between valve rod 8 and the valve clack 2.

Valve body 1 and valve gap 5 hookup location symmetry and fixed mounting have stud 18, stud 18 one end is located valve gap 5 top threaded connection and has lock nut 19, valve body 1 and valve gap 5 hookup location are provided with winding gasket 27, valve clack 2 surface is located sealing layer 3022 bottom fixed mounting has uide bushing 25, sets up the uide bushing 25 and is used for bearing sealing layer 3022 and finger spring 3021, guarantees the compactness of seal assembly 3 installation.

The valve body 1 comprises a first cavity 101 and a second cavity 102, the first cavity 101 is communicated with the valve flap 2, flanges 26 are arranged on one sides of the first cavity 101 and one side of the second cavity 102, and the valve flap 2 is communicated with the first cavity 101 through the first cavity 101 and the second cavity 102.

The structure principle is as follows: the sealing structure is characterized in that a gasket 301, a sealing assembly 3 and a guide sleeve 25 are sequentially arranged between the valve clack 2 and the valve body 1, a finger spring 3021 and a sealing layer 3022 are respectively arranged in the sealing assembly 3, the sealing structure is different from the existing sealing structure which is made of high-density elastic materials of O-shaped sealing rings, Y-shaped sealing rings and the like, the finger spring 3021 and the sealing layer 3022 are used in a matched mode, the sealing structure can adapt to certain high pressure and high temperature states without deformation, the diameter of the valve rod 8 does not need to be increased or the operation model of the gear box does not need to be increased, the operation torque.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or some features may be substituted by equivalent features, and any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention are within the scope of the present invention.

Claims

1. The utility model provides a novel pressure self-balancing seal structure, includes valve body (1) and valve clack (2), its characterized in that: the valve clack (2) is fixedly installed in a valve body (1), a sealing assembly (3) is arranged on the outer wall of the valve clack (2), the sealing assembly (3) comprises a gasket (301) and a sealing ring (302), the sealing ring (302) comprises a finger-shaped spring (3021) and a sealing layer (3022), a cushion block (4) is fixedly installed above the finger-shaped spring (3021) and located in the valve body (1), a valve rod (8) is fixedly inserted into the top of the valve clack (2), a valve cover (5) is fixedly installed on the top of the valve body (1), a packing pressing plate (9) is fixedly installed in the valve cover (5) on the surface of the valve rod (8), a swing bolt (14) is connected to one side of the valve cover (5) in a pin mode, and the swing bolt (;

valve gap (5) one side slidable mounting has guide block (17), guide block (17) pass through screw fixed mounting in valve rod (8) surface, valve gap (5) top is provided with valve-stem nut (20), valve-stem nut (20) surface threaded connection has first round nut (21).

2. The novel pressure self-balancing sealing structure of claim 1, characterized in that: the valve is characterized in that a through hole is formed in the valve cover (5) at the position where the valve rod (8) penetrates through, and the valve rod (8) is located at one end inside the valve body (1) and is fixedly provided with a nut (7).

3. The novel pressure self-balancing sealing structure of claim 1, characterized in that: and a pin shaft (15) is inserted into one end of the swing bolt (14), and split pins are inserted into two ends of the pin shaft (15).

4. The novel pressure self-balancing sealing structure of claim 1, characterized in that: valve body (1) and valve gap (5) hookup location symmetry and fixed mounting have stud (18), stud (18) one end is located valve gap (5) top threaded connection and has lock nut (19), valve body (1) and valve gap (5) hookup location are provided with winding gasket (27).

5. The novel pressure self-balancing sealing structure of claim 1, characterized in that: valve rod (8) top fixed mounting has hand wheel (22), fixed surface installs in data plate (23) on hand wheel (22), data plate (23) upper surface is located valve rod (8) top fixed mounting has second round nut (24).

6. The novel pressure self-balancing sealing structure of claim 1, characterized in that: the packing pressing plate (9) comprises a pressing plate (901) and a packing layer (902) filled at the bottom in the pressing plate (901), wherein the packing layer (902) is of a flexible graphite layer structure.

7. The novel pressure self-balancing sealing structure of claim 1, characterized in that: and a guide sleeve (25) is fixedly arranged on the surface of the valve clack (2) at the bottom of the sealing layer (3022).

8. The novel pressure self-balancing sealing structure of claim 1, characterized in that: the valve body (1) comprises a first cavity (101) and a second cavity (102), and the first cavity (101) is communicated with the valve clack (2).

9. The novel pressure self-balancing sealing structure of claim 8, wherein: flanges (26) are arranged on one sides of the first cavity (101) and the second cavity (102).