CN214305389U

CN214305389U - Three-piece type soft sealing fixed ball valve

Info

Publication number: CN214305389U
Application number: CN202120199038.1U
Authority: CN
Inventors: 梁庚寅
Original assignee: Guotaitong Energy Equipment Co ltd
Current assignee: Guotaitong Energy Equipment Group Co.,Ltd.
Priority date: 2021-01-25
Filing date: 2021-01-25
Publication date: 2021-09-28
Anticipated expiration: 2031-01-25

Abstract

The utility model discloses a three-piece type soft sealing fixed ball valve, which comprises a valve body and a valve cover symmetrically connected with the left end and the right end of the valve body; a ball body is accommodated in a cavity formed between the valve body and the valve cover, a valve rod is fixedly connected above the ball body, the upper end of the valve rod is fixedly connected with a worm gear at the top end of the valve body through a flat key, and an upper shaft sleeve connected with the valve body is sleeved on the outer side of the valve rod; a supporting shaft which is fixed on the valve body through a pin and is used for supporting the ball body is arranged in a cavity below the ball body, and a bearing fixedly connected with the ball body is sleeved in the supporting shaft; the left side and the right side of the ball body are symmetrically provided with valve seat assemblies which are positioned between the ball body and the valve cover and used for sealing the valve through a spring and a plurality of sealing rings; a valve rod sealing and thrust assembly comprising a plurality of O-shaped sealing rings is arranged between the upper part of the valve body and the valve rod; and a second O-shaped ring for sealing the valve is arranged between the supporting shaft and the bearing. The utility model discloses have good leakproofness and higher security, increased application operating mode scope.

Description

Three-piece type soft sealing fixed ball valve

Technical Field

The utility model relates to the technical field of valves, concretely relates to three formula soft sealing fixed ball valves.

Background

The valve is a control device of a fluid pipeline, and the basic functions of the valve are to connect or cut off the circulation of pipeline media, change the flowing direction of the media, adjust the pressure and the flow of the media and protect the normal operation of pipeline equipment.

With the continuous development of modern industry, the demand of valves is continuously increasing. However, the existing three-piece soft-sealing fixed ball valve in China is relatively lack of low-leakage satisfaction, and has the defects that low leakage occurs in a plurality of places, so that the safety of the valve is low, the working condition requirements of a large amount of petrochemical engineering are difficult to meet, and the valve is unstable in emergency, so that the application range of the product is reduced, and the new technical requirements of customers are difficult to meet. Therefore, the problem of low micro-leakage of the three-piece ball valve can be solved, which is a problem that needs to be solved urgently by the technical staff at the present stage.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that needs to solve provides a three formula soft seal fixed ball valves, can solve three formula ball valves and leak the problem a little, has increased the applicable operating mode scope of three formula ball valves.

In order to solve the technical problem, the utility model adopts the following technical proposal.

A three-piece type soft sealing fixed ball valve comprises a valve body and valve covers symmetrically connected with the left end and the right end of the valve body; a hollow ball with a tubular structure is accommodated in a cavity formed between the valve body and the valve cover, a valve rod for driving the ball to rotate is fixedly connected above the ball, the upper end of the valve rod is fixedly connected with a worm gear which is used for driving the valve rod to rotate and is fixed at the top end of the valve body through a flat key, and an upper shaft sleeve connected with the valve body is sleeved on the outer side of the valve rod; a supporting shaft which is fixed on the valve body through a pin and is used for supporting the ball body is arranged in a cavity below the ball body, and a bearing fixedly connected with the ball body is sleeved in the supporting shaft; the valve seat assemblies are symmetrically arranged on the left side and the right side of the ball body, are positioned between the ball body and the valve cover and seal the valve through springs and a plurality of sealing rings; a valve rod sealing and thrust assembly is arranged between the upper part of the valve body and the valve rod and comprises a fourth gasket, a fifth O-shaped ring, a sixth O-shaped ring, an upper cover and a thrust pad, wherein the fourth gasket, the fifth O-shaped ring and the sixth O-shaped ring are sequentially arranged from top to bottom and used for sealing the valve rod; and a second O-shaped ring for sealing the valve is arranged between the supporting shaft and the bearing.

Preferably, an oil injection device consisting of an oil injection valve and a check valve is arranged on the valve rod, and three O-shaped ring sealing structures are arranged at the upper position and the lower position of the oil injection device.

Preferably, a bottom cover fixed on the valve body is arranged below the supporting shaft.

Preferably, the valve seat assembly comprises a valve seat support ring, grooves are formed in the contact surface of the valve seat support ring and the valve cover and the contact surface of the valve seat support ring and the valve body at intervals, and a third O-shaped ring (18) and a fourth O-shaped ring for sealing are sequentially embedded in the grooves along the direction from the valve cover to the ball body; the contact surface of the valve seat support ring and the ball body is sequentially provided with a valve seat secondary sealing ring, a triangular valve seat primary sealing ring and a valve seat dirt blocking ring which are attached to the ball body from inside to outside through three spaced grooves, the valve seat dirt blocking ring is connected with a plurality of springs transversely arranged between the valve seat support ring and the valve cover through a plurality of spring cavities formed in the valve seat support ring, one ends of the springs, which are in contact with the valve cover, are embedded into the spring grooves formed in the valve cover, and two sides of each spring are provided with a first pressing sleeve fixed on the valve seat support ring and a second pressing sleeve fixed in the spring grooves; and a grease channel for communicating the spherical surface of the ball body with the oil filling valve is arranged on the valve seat supporting ring.

Preferably, an oil filling valve is arranged on the valve cover, and a check valve is arranged below the oil filling valve.

Preferably, a blow-down valve for discharging dirt is arranged below the valve body, two O-shaped rings for sealing are arranged on the blow-down valve, one O-shaped ring is arranged axially, and the other O-shaped ring is arranged on the plane.

Due to the adoption of the technical scheme, the utility model has the following technical progress.

The utility model has good sealing performance and higher safety, and increases the applicable working condition range of the three-piece ball valve; the valve rod is sealed by adopting a plurality of O-shaped sealing rings, and the valve rod is sealed by a plurality of sealing designs of the sealing assembly and the pre-tightening compression force of the spring, so that the condition of low micro leakage of the valve can be greatly reduced; the oil injection device through the valve rod and the valve seat assembly adopts a combined oil injector, sealing grease can be injected emergently under the condition that the sealing of the valve rod or the valve seat assembly fails, the emergency sealing effect is achieved, and the backflow of the sealing grease can be prevented.

Drawings

FIG. 1 is a sectional view of the structure of the present invention;

FIG. 2 is a cross-sectional view of the valve seat assembly of the present invention;

fig. 3 is a sectional view of the valve stem seal and thrust assembly of the present invention.

Wherein: 1. the novel anti-static valve comprises a valve cover, 2, a first stud, 3, a first nut, 4, a first gasket, 5, a first O-shaped ring, 6, a ball body, 7, a first screw, 8, a second gasket, 9, a bottom cover, 10, a support shaft, 11, a second O-shaped ring, 12, a blow-down valve, 13, a bearing, 14, a third gasket, 15, a valve body, 16, an oil filling valve, 17, a check valve, 18, a third O-shaped ring, 19, a valve seat support ring, 20, a fourth O-shaped ring, 21, a fire prevention ring, 22, a spring, 23, a valve seat secondary sealing ring, 24, a valve seat primary sealing ring, 25, a valve seat dirt blocking ring, 26, an exhaust valve, 27, a valve rod, 28, an anti-static device, 29, an upper shaft sleeve, 30, an oil filling device, 31, a second stud, 32, a second nut, 33, a second screw, 34, a fourth gasket, 35, a fifth O-shaped ring, 36, a sixth O-shaped ring, 37, an upper cover, 38, a thrust gasket, 38, and a thrust washer, 39. Flat key, 40 worm wheel, 41 valve seat component, 42 valve rod sealing and thrust component.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

A three-piece type soft sealing fixed ball valve is shown in a combined figure 1 and comprises a valve body 15 and a valve cover 1 symmetrically connected with the left end and the right end of the valve body 15, a valve rod 27 is arranged inside the valve body 15 and the valve cover 1 through a ball body 6, a worm wheel 40 is arranged at the top end of the valve body 15, and the worm wheel 40 is connected to the valve rod 27 through a flat key 39.

The left end and the right end of the valve body 15 are symmetrically connected with the valve cover 1 through the first stud 2 and the first nut 3, a first gasket 4 and a first O-shaped ring 5 are arranged on the connecting surface of the valve body 15 and the valve cover 1, and the first gasket 4 and the first O-shaped ring 5 are used for sealing the connecting part. A containing cavity is formed between the connected valve body 15 and the valve cover 1, and the ball body 6 is contained in the containing cavity.

The sphere 6 is used for controlling the opening and closing of the valve, the tubular channel is radially arranged on the sphere 6, the exhaust valve 26 is arranged on the sphere 6, and the exhaust valve 26 is used for exhausting gas remained in the sphere 6 after the valve is closed.

The lower end of a valve rod 27 is fixedly connected above the ball body 6, and the valve rod 27 is used for driving the ball body 6 to rotate to open and close the valve. The upper end of the valve rod 27 is connected with a worm wheel 40 through a flat key 39, the worm wheel 40 is fixed at the top end of the valve body 15 through a second stud 31 and a second nut 32, the worm wheel 40 is used for driving the valve rod 27 to rotate, and the moment conversion of the worm wheel 40 can enable a single person to easily operate the opening and closing of the valve.

The outer side of the valve rod 27 is sleeved with an upper shaft sleeve 29, the upper shaft sleeve 29 is connected with the valve body 15, the side wall of the valve rod 27 corresponding to the upper shaft sleeve 29 is provided with an anti-static device 28, and the anti-static device 28 can prevent inflammable media from being ignited due to static ignition, so that the integral safe operation under special working conditions is ensured. A valve rod sealing and thrust assembly 42 is arranged between the valve rod 27 and the upper part of the valve body 15 through a second screw 33, and the valve rod sealing and thrust assembly 42 is used for sealing and thrusting the valve rod 27.

The stem seal and thrust assembly 42 includes, from top to bottom, a fourth gasket 34, a fifth O-ring 35, a sixth O-ring 36, an upper cover 37, and a thrust pad 38, as shown in fig. 3. Wherein the fourth gasket 34 is used to seal the valve stem sealing and thrust assembly 42 against the valve body 15 interface. The fifth O-ring 35, the sixth O-ring 36 and the upper cover 37 are used for sealing the valve rod 27, and a plurality of O-rings are used for sealing, so that the condition of low micro leakage of the valve is greatly reduced, and the sealing effect is obvious; the thrust pad 38 is used to limit the rotational angle of the valve stem 27.

An oil injection device 30 is arranged on the valve rod 27, the oil injection device 30 is a valve rod oil injector consisting of an oil injection valve and a check valve, and three O-shaped ring sealing structures are arranged at the upper position and the lower position of the oil injection device 30. Sealing grease is injected emergently through the oil injection device 30 under the condition that the sealing of the valve rod 27 is failed, the emergency sealing effect can be achieved on the valve rod 27, and the backflow of the sealing grease can also be prevented.

A supporting shaft 10 is arranged in the cavity below the ball body 6, and the supporting shaft 10 is used for supporting the ball body 6. The supporting shaft 10 is fixed on the valve body 15 through a pin, a third gasket 14 is arranged on the contact surface of the upper part of the supporting shaft 10 and the ball body 6, and the third gasket 14 is used for sealing between the supporting shaft 10 and the ball body 6; the lower part of the supporting shaft 10 is connected with a bottom cover 9, the bottom cover 9 is fixed on the valve body 15 through a first screw 7, a second gasket 8 is arranged on the contact surface of the bottom cover 9 and the valve body 15, and the second gasket 8 is used for sealing between the bottom cover 9 and the valve body 15. The inside cover of back shaft 10 is equipped with bearing 13, and bearing 13 and spheroid 6 fixed connection. Two second O-rings 11 are arranged between the supporting shaft 10 and the bearing 13, and the second O-rings 11 are used for sealing the valve.

The valve seat assembly 41 is symmetrically arranged on the left side and the right side of the ball body 6, and the valve seat assembly 41 is positioned between the ball body 6 and the valve cover 1. The sectional view of the valve seat assembly 41 is shown in fig. 2, the valve seat assembly 41 includes a valve seat support ring 19, three spaced grooves are formed on the contact surface of the valve seat support ring 19 and the valve cover 1, and a third O-ring 18, a fourth O-ring 20 and a fire prevention ring 21 are sequentially arranged in the grooves along the direction from the valve cover 1 to the ball body 6. The third O-ring 18 and the fourth O-ring 20 are used for sealing the contact surface of the valve seat assembly 41 and the valve cover 1; the fire collar 21 is made of graphite material, and when the pipeline is on fire, the fire collar can expand rapidly under high temperature condition to block the pipeline, thereby preventing the fire from spreading.

The contact surface of the valve seat support ring 19 and the ball body 6 is provided with a valve seat secondary sealing ring 23, a valve seat primary sealing ring 24 and a valve seat dirt blocking ring 25 which are attached to the ball body 6 in sequence from inside to outside through three spaced grooves to form a sealing surface between the valve seat assembly 41 and the ball body 6. The contact surface of the valve seat secondary sealing ring 23 and the ball body 6 is an inclined surface which can be attached to the ball body 6, and the valve seat secondary sealing ring 23 is made of MOLON materials and has high bearing and wear resistance; the primary sealing ring 24 of the valve seat is triangular and made of fluororubber material, and has good oil resistance, corrosion resistance and high temperature resistance. Valve seat second grade sealing washer 23, valve seat first grade sealing washer 24 have constituted the double-seal structure between valve seat subassembly 41 and spheroid 6: when the pressure is low, the valve seat secondary sealing ring 23 is used for sealing; when the pressure is high, the air pressure thrust drives the valve seat assembly 41 to move to reach the valve seat primary sealing ring 24 for sealing, so that the double-sealing effect is achieved. The valve seat dirt blocking ring 25 is made of stainless steel, the valve seat dirt blocking ring 25 is connected with a plurality of springs 22 through a plurality of spring cavities formed in the valve seat support ring 19, and the valve seat dirt blocking ring 25 is used for blocking solid particle media in a pipeline from entering the spring cavities.

The spring 22 is transversely arranged between the valve seat assembly 41 and the valve cover 1, one end, contacting the valve cover 1, of the spring 22 is embedded into a spring groove formed in the valve cover 1, a first pressing sleeve and a second pressing sleeve are arranged on two sides of the spring 22, the first pressing sleeve is fixed on the valve seat support ring 19, and the second pressing sleeve is fixed in the spring groove. The pre-tightening compression force of the spring 22 not only can form good sealing between the valve seat assembly 41 and the valve cover 1 and form reliable sealing by tight fitting between the sealing surface of the valve seat assembly 41 and the sealing surface of the ball 6, but also can extrude the dirty blocking ring 25 of the valve seat by the first pressing sleeve and the valve cover 1 through the first pressing sleeve effect, so that good sealing is formed between the dirty blocking ring 25 of the valve seat and the valve seat assembly 41 and the valve cover 1, solid particle media in a pipeline can not enter a spring cavity, and the valve can be reliably used for a long time. And set up the second pressure cover in the disk seat subassembly 41 outside, make disk seat subassembly 41 can design longer and have better direction locate function, make disk seat subassembly 41 be difficult to the swing when spheroid 6 switch is rotatory, also difficult emergence spheroid 6 with make disk seat subassembly 41 card dead, improved sealing performance greatly.

A grease channel is formed in the valve seat support ring 19, the outlet end of the grease channel is located between the valve seat secondary sealing ring 23 and the valve seat primary sealing ring 24, and the inlet end of the grease channel is located between the third O-shaped ring 18 and the fourth O-shaped ring 20. An oil filling valve 16 is connected to the inlet end of the grease passage, the oil filling valve 16 is arranged on the valve cover 1, and a check valve 17 is arranged below the oil filling valve 16. Wherein the oil filling valve 16 and the check valve 17 can be filled with sealing grease in emergency under the condition that the sealing of the valve seat assembly 41 fails, so as to achieve the emergency sealing effect and prevent the backflow of the sealing grease.

A blow-down valve 12 is arranged below the valve body 15, the blow-down valve 12 is used for discharging dirt in the ball body 6, two O-shaped rings are arranged on the blow-down valve 12 for sealing, one O-shaped ring is arranged axially, and the other O-shaped ring is arranged on the plane.

When the utility model is used, a plurality of O-shaped sealing rings are adopted for sealing the valve rod, and the sealing is carried out by the multi-sealing design of the sealing component and the pre-tightening force of the spring, so that the condition of low and micro leakage of the valve can be greatly reduced; the oil injection device through the valve rod and the valve seat assembly adopts a combined oil injector, sealing grease can be injected urgently under the condition that the sealing of the valve rod or the valve seat assembly is invalid, the emergency sealing effect is achieved, the backflow of the sealing grease can be prevented, and the sealing performance is greatly improved.

Claims

1. A three-piece type soft sealing fixed ball valve comprises a valve body (15) and a valve cover (1) which is symmetrically connected with the left end and the right end of the valve body (15); a hollow ball body (6) with a tubular structure is accommodated in a cavity formed between the valve body (15) and the valve cover (1), a valve rod (27) used for driving the ball body (6) to rotate is fixedly connected above the ball body (6), the upper end of the valve rod (27) is fixedly connected with a worm wheel (40) which is used for driving the valve rod (27) to rotate and is fixed at the top end of the valve body (15) through a flat key (39), and an upper shaft sleeve (29) connected with the valve body (15) is sleeved on the outer side of the valve rod (27); a supporting shaft (10) which is fixed on the valve body (15) through a pin and is used for supporting the ball body (6) is arranged in a cavity below the ball body (6), and a bearing (13) fixedly connected with the ball body (6) is sleeved in the supporting shaft (10); the method is characterized in that: the left side and the right side of the sphere (6) are symmetrically provided with valve seat assemblies (41) which are positioned between the sphere (6) and the valve cover (1) and seal the valve through a spring (22) and a plurality of sealing rings; a valve rod sealing and thrust assembly (42) is arranged between the upper part of the valve body (15) and the valve rod (27), and the valve rod sealing and thrust assembly (42) comprises a fourth gasket (34), a fifth O-shaped ring (35), a sixth O-shaped ring (36), an upper cover (37) and a thrust pad (38) which are sequentially arranged from top to bottom and used for sealing the valve rod (27); and a second O-shaped ring (11) for sealing the valve is arranged between the supporting shaft (10) and the bearing (13).

2. The three-piece soft seal fixed ball valve of claim 1, wherein: an oil injection device (30) consisting of an oil injection valve and a check valve is arranged on the valve rod (27), and three O-shaped ring sealing structures are arranged at the upper and lower positions of the oil injection device (30).

3. The three-piece soft seal fixed ball valve of claim 1, wherein: and a bottom cover (9) fixed on the valve body (15) is arranged below the supporting shaft (10).

4. The three-piece soft seal fixed ball valve of claim 1, wherein: the valve seat assembly (41) comprises a valve seat support ring (19), grooves are formed in the contact surface of the valve seat support ring (19) and the valve cover (1) and the contact surface of the valve seat support ring (19) and the valve body (15) at intervals, and a third O-shaped ring (18) and a fourth O-shaped ring (20) for sealing are sequentially embedded in the grooves along the direction from the valve cover (1) to the ball body (6); a valve seat secondary sealing ring (23) attached to the ball body (6), a triangular valve seat primary sealing ring (24) and a valve seat dirt blocking ring (25) are sequentially arranged on the contact surface of the valve seat supporting ring (19) and the ball body (6) from inside to outside through three spaced grooves, the valve seat dirt blocking ring (25) is connected with a plurality of springs (22) transversely arranged between the valve seat supporting ring (19) and the valve cover (1) through a plurality of spring cavities formed in the valve seat supporting ring (19), one ends of the springs (22) in contact with the valve cover (1) are embedded into the spring grooves formed in the valve cover (1), and first pressing sleeves fixed on the valve seat supporting ring (19) and second pressing sleeves fixed in the spring grooves are arranged on two sides of the springs (22); the valve seat support ring (19) is provided with a grease channel for communicating the spherical surface of the ball body (6) with the oil filling valve (16).

5. The three-piece soft seal fixed ball valve of claim 4, wherein: an oil filling valve (16) is arranged on the valve cover (1), and a check valve (17) is arranged below the oil filling valve (16).

6. The three-piece soft seal fixed ball valve of claim 1, wherein: a blowdown valve (12) used for discharging dirt is arranged below the valve body (15), two O-shaped rings used for sealing are arranged on the blowdown valve (12), one O-shaped ring is axially arranged, and the other O-shaped ring is arranged on the plane.