CN113280123B - A composite sealing valve - Google Patents

Abstract

A composite sealing valve comprises: a valve body, wherein the left and right sides of the valve body are provided with a first fluid channel and a second fluid channel, and the valve body is also provided with a partition hole connected with the first fluid channel and the second fluid channel; a valve seat, wherein the valve seat is located in the partition hole; a first valve core, wherein the first valve core comprises a sealing part and a connecting part, wherein the sealing part can be inserted into the matching hole, and wherein the connecting part is movably connected with the valve stem; a second valve core, wherein the connecting part passes through the top of the second valve core, and a first compression spring is provided between the stepped surface and the second valve core; a bracket, wherein the bracket is fixedly connected with the valve body, and the valve stem is threadedly connected with the bracket. This composite sealing valve has a double sealing function, and its sealing performance is better than that of a valve having only one seal, and its sealing is tighter and its service life is longer.

Description

A composite sealing valve

Technical Field

The invention belongs to the technical field of valves, and in particular relates to a composite sealing valve.

Background Art

Valves are pipe accessories used to open and close pipelines, control flow direction, and adjust and control the parameters of the conveying medium (temperature, pressure and flow). They can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. The sealing performance of the valve is the ability of each sealing part of the valve to prevent the leakage of the medium. It is the most important technical performance indicator of the valve. In the existing technology, the valve has only one seal, which is easily eroded and corroded under harsh working conditions, causing the valve to leak internally, seriously affecting the sealing performance of the valve.

Summary of the invention

The purpose of the present invention is to provide a composite sealing valve to solve the problems raised in the above background technology.

To achieve the above object, the technical solution adopted by the present invention is: a composite sealing valve, comprising:

A valve body, wherein a first fluid channel and a second fluid channel are provided on the left and right sides of the valve body, and a partition hole connected to the first fluid channel and the second fluid channel is also provided in the valve body, and the intersection of the first fluid channel and the partition hole is located above the intersection of the second fluid channel and the partition hole;

A valve seat, wherein the valve seat is located in the partition hole and between the two intersections, a matching portion is provided at the upper end of the valve seat, a matching hole is provided in the matching portion, and a gap is left between the outer surface of the matching portion and the partition hole;

A first valve core, the first valve core comprises a sealing portion and a connecting portion, the sealing portion can be inserted into the matching hole, and when the sealing portion is inserted into the matching hole, the outer surface of the sealing portion is in full or partial contact with the side surface of the matching hole, a horizontal step surface is provided on the outer side of the transition between the sealing portion and the connecting portion, and the connecting portion is movably connected to the valve stem;

a second valve core, wherein the second valve core is provided with a stepped hole, the first valve core is provided in the stepped hole, the side surface of the stepped hole is in full or partial contact with the outer surface of the matching portion, the connecting portion passes through the top of the second valve core, the top of the second valve core is located between the valve stem and the stepped surface, and the top surface of the second valve core is in contact with the bottom surface of the valve body, and a first compression spring is provided between the stepped surface and the second valve core;

The bracket is fixedly connected to the valve body, the valve stem extends into the bracket and passes through the top of the bracket, and the valve stem is threadedly connected to the bracket.

On the basis of the above scheme and as a preferred scheme of the above scheme, the inner and outer surfaces of the top of the matching portion are both provided with conical surfaces, and the outer surface of the sealing portion and the side surface of the stepped hole are respectively provided with conical surfaces matching therewith.

On the basis of the above scheme and as a preferred scheme of the above scheme, a threaded hole is provided on the connecting portion, a screw is threadedly connected in the threaded hole, a socket is provided at the bottom of the valve stem, a waist-shaped hole is provided on the valve stem, the waist-shaped hole passes through the socket, the connecting portion is located in the socket, both ends of the screw are located in the waist-shaped hole, and after the screw is connected to the first valve core, the screw can move up and down in the waist-shaped hole, and the maximum compression amount of the first compression spring is greater than the maximum moving distance of the screw in the waist-shaped hole.

On the basis of the above scheme and as a preferred scheme of the above scheme, the valve stem includes an upper valve stem and a lower valve stem, and the upper valve stem and the lower valve stem are connected through a compensator; the upper part of the upper valve stem is threadedly connected to the bracket, the lower part of the upper valve stem is fixedly connected to the compensator, and the lower valve stem is movably connected to the compensator. A second compression spring is provided between the upper valve stem and the lower valve stem, and the second compression spring is located inside the compensator. An anti-rotation card is fixedly connected to the side of the compensator, and the anti-rotation card is movably connected to the bracket, and the anti-rotation card can only move up and down along the bracket.

On the basis of the above scheme and as a preferred scheme of the above scheme, the upper valve stem includes a trapezoidal screw and a trapezoidal nut, the trapezoidal screw and the trapezoidal nut are threadedly connected, the trapezoidal nut extends from the top of the bracket, and the trapezoidal nut is rotationally connected to the bracket.

On the basis of the above scheme and as a preferred scheme of the above scheme, the lower end of the bracket is connected to a valve cover, a packing is arranged in the valve cover, the valve stem passes through the middle of the packing, and the valve body, valve seat and valve cover are fixed together by bolts.

On the basis of the above scheme and as a preferred scheme of the above scheme, a compression sleeve is provided in the partition hole, the bottom of the compression sleeve contacts the valve seat, and the top of the compression sleeve contacts the end surface of the valve cover.

On the basis of the above solution and as a preferred solution of the above solution, a positioning sleeve is provided between the bracket and the valve cover, and the bolt passes through the positioning sleeve.

On the basis of the above scheme and as a preferred scheme of the above scheme, sealing gaskets are provided between the valve cover and the valve body, and between the valve seat and the valve body; a metal gasket is provided at the bottom of the packing, and the metal gasket is provided between the packing and the valve cover.

On the basis of the above solution and as a preferred solution of the above solution, a hand wheel is connected to the top of the valve stem.

The beneficial effects of the present invention are as follows: the composite sealing valve has a double sealing function, and its sealing performance is better than that of a valve with only one seal, its sealing is tighter, and its service life is longer; a first compression spring is arranged between the first valve core and the second valve core, so that the valve has an automatic compensation sealing function; a second compression spring is arranged between the upper valve stem and the lower valve stem, so that when sealing, the upper valve stem and the lower valve stem can always be in a compressed state, ensuring that the lower valve stem can always compress the two valve cores, so that the sealing performance of the entire valve is better; the trapezoidal screw rod can be driven to rotate by rotating the trapezoidal nut, so that the threaded connection between the upper valve stem and the bracket is converted into a rotating connection, thereby avoiding wear of the bracket; the upper valve stem and the lower valve stem convert the three-point contact between the valve stem and the trapezoidal nut, the packing, and the valve seat into a two-point contact between the lower valve stem and the packing and the valve seat, thereby avoiding distortion and deformation of the valve stem due to uneven force; the valve only needs to use bolts to fix the entire valve together, which is easy to assemble and avoids the use of fasteners for connection in multiple places.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

FIG. 1 is a cross-sectional view of the present invention.

FIG. 2 is a cross-sectional view of the valve seat.

FIG. 3 is a cross-sectional view of the first valve core.

FIG. 4 is a cross-sectional view of the second valve core.

FIG5 is a cross-sectional view of a partial structure of the present invention.

FIG. 6 is a cross-sectional view of the valve stem.

The reference numerals are as follows:

1. Valve body; 101. First fluid channel; 102. Second fluid channel; 103. Partition hole;

2. valve seat; 201. matching portion; 202. matching hole;

3. first valve core; 301. sealing portion; 302. connecting portion; 303. stepped surface; 304. threaded hole;

4. second valve core; 401. stepped hole;

5. Valve stem; 501. Socket; 502. Waist-shaped hole; 503. Upper valve stem; 5031. Trapezoidal screw rod; 5032. Trapezoidal nut; 504. Lower valve stem;

6. First compression spring; 7. Bracket;

8. Conical surface; 9. Screw; 10. Compensator; 11. Second compression spring; 12. Anti-rotation card; 13. Valve cover; 14. Packing; 15. Bolt; 16. Pressure sleeve; 17. Positioning sleeve; 18. Sealing gasket; 19. Handwheel; 20. Metal washer.

DETAILED DESCRIPTION

In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by the terms "up", "down", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

As shown in Figures 1 to 6, a composite sealing valve comprises:

A valve body 1, wherein a first fluid channel 101 and a second fluid channel 102 are provided on the left and right sides of the valve body 1, and a partition hole 103 communicating with the first fluid channel 101 and the second fluid channel 102 is further provided in the valve body 1, and the intersection of the first fluid channel 101 and the partition hole 103 is located above the intersection of the second fluid channel 102 and the partition hole 103;

A valve seat 2, wherein the valve seat 2 is located in the partition hole 103 and between the two intersections, a matching portion 201 is provided at the upper end of the valve seat 2, a matching hole 202 is provided in the matching portion 201, and a gap is left between the outer surface of the matching portion 201 and the partition hole 103;

The first valve core 3 includes a sealing portion 301 and a connecting portion 302. The sealing portion 301 can be inserted into the matching hole 202. When the sealing portion 301 is inserted into the matching hole 202, the outer surface of the sealing portion 301 is in full or partial contact with the side surface of the matching hole 202. A horizontal step surface 303 is provided on the outer side of the transition between the sealing portion 301 and the connecting portion 302. The connecting portion 302 is movably connected to the valve stem 5.

A second valve core 4, wherein a stepped hole 401 is provided in the second valve core 4, the first valve core 3 is provided in the stepped hole 401, the side surface of the stepped hole 401 is in full or partial contact with the outer surface of the matching portion 201, the connecting portion 302 passes through the top of the second valve core 4, the top of the second valve core 4 is located between the valve stem 5 and the stepped surface 303, and the top surface of the second valve core 4 is in contact with the bottom surface of the valve body 1, and a first compression spring 6 is provided between the stepped surface 303 and the second valve core 4;

The bracket 7 is fixedly connected to the valve body 1 , the valve stem 5 extends into the bracket 7 and passes through the top of the bracket 7 , and the valve stem 5 is threadedly connected to the bracket 7 .

When in use, the valve stem is rotated, the valve stem is threadedly connected to the bracket, the valve stem will move downward, and the valve stem will press the first valve core and the second valve core downward, so that the first valve core and the second valve core are respectively in contact with the inner and outer surfaces of the valve seat, thereby achieving double sealing; and a first compression spring is provided between the first valve core and the second valve core, when the first valve core is worn or corroded, the first valve core can be automatically pressed downward, forcing the first valve core to always be in contact with the valve seat, thereby ensuring the sealing effect. This composite sealing valve has a double sealing function, and its sealing performance is better than that of a valve with only one seal, the sealing is tighter, and the service life is longer; a first compression spring is provided between the first valve core and the second valve core, so that this valve has an automatic compensation sealing function.

The inner and outer surfaces of the top of the matching portion 201 are both provided with a conical surface 8, and the outer surface of the sealing portion 301 and the side surface of the stepped hole 401 are respectively provided with a conical surface 8 that matches therewith. The first valve core and the second valve core are both in contact with the conical surface of the valve seat through the conical surface, which increases the contact area between them and makes the sealing effect better.

The connection part 302 is provided with a threaded hole 304, in which a screw rod 9 is threadedly connected, a plug hole 501 is provided at the bottom of the valve stem 5, a waist-shaped hole 502 is provided on the valve stem 5, and the waist-shaped hole 502 passes through the plug hole 501, the connection part 302 is located in the plug hole 501, and both ends of the screw rod 9 are located in the waist-shaped hole 502, and after the screw rod 9 is connected to the first valve core 3, the screw rod 9 can move up and down in the waist-shaped hole 502, and the maximum compression amount of the first compression spring 6 is greater than the maximum moving distance of the screw rod 9 in the waist-shaped hole 502. When the valve stem is rotated, the valve stem moves downward and squeezes the first valve core first, so that the first valve core contacts the valve seat first; the valve stem is continuously rotated, and the valve stem continues to move downward. When the first compression spring is compressed to the limit, it forces the second valve core to move downward, so that the second valve core contacts the valve seat. In this way, the first valve core and the second valve core contact the valve seat successively, forming two sealing structures.

The valve stem 5 includes an upper valve stem 503 and a lower valve stem 504, and the upper valve stem 503 and the lower valve stem 504 are connected through a compensator 10; the upper part of the upper valve stem 503 is threadedly connected to the bracket 7, the lower part of the upper valve stem 503 is fixedly connected to the compensator 10, and the lower valve stem 504 is movably connected to the compensator 10. A second compression spring 11 is provided between the upper valve stem 503 and the lower valve stem 504, and the second compression spring 11 is located inside the compensator 10. An anti-rotation card 12 is fixedly connected to the side of the compensator 10, and the anti-rotation card 12 is movably connected to the bracket 7, and the anti-rotation card 12 can only move up and down along the bracket 7.

The lower valve stem is provided with an annular clamping groove on one side close to the upper valve stem, a clamping ring is provided in the clamping groove, the outer diameter of the clamping ring is larger than the diameter of the lower valve stem, and the compensator is provided with a stepped hole, the clamping ring is located in the stepped hole, so that the lower valve stem can be rotatably clamped in the compensator.

A second compression spring is provided between the upper valve stem and the lower valve stem. When sealing, the upper valve stem and the lower valve stem can always be in a compressed state, ensuring that the lower valve stem can always compress the two valve cores, thereby improving the sealing performance of the entire valve.

The upper valve stem 503 includes a trapezoidal screw rod 5031 and a trapezoidal nut 5032, which are threadedly connected to each other, and the trapezoidal nut 5032 extends from the top of the bracket 7, and the trapezoidal nut 5032 is rotatably connected to the bracket 7. The trapezoidal screw rod can be driven to rotate by rotating the trapezoidal nut, so that the threaded connection between the upper valve stem and the bracket is converted into a rotatable connection, thereby avoiding the wear of the bracket.

The lower end of the bracket 7 is connected to a valve cover 13, in which a packing 14 is arranged, and the valve stem 5 passes through the middle of the packing 14. The valve body 1, the valve seat 2 and the valve cover 13 are fixedly connected together by bolts 15. The valve stem and the packing are in contact with each other, which increases the friction between the valve stem and the packing, increases the stability of the valve stem, and ensures that the valve stem will not fail easily. The upper valve stem and the lower valve stem transform the three-point contact between the valve stem and the trapezoidal nut, the packing and the valve seat into a two-point contact between the lower valve stem and the packing and the valve seat, avoiding the distortion and deformation of the valve stem due to uneven force.

A compression sleeve 16 is provided in the partition hole 103, the bottom of the compression sleeve 16 contacts the valve seat 2, and the top of the compression sleeve 16 contacts the end surface of the valve cover 13. A positioning sleeve 17 is provided between the bracket 7 and the valve cover 13, and the bolt 15 passes through the positioning sleeve 17. The compression sleeve and the positioning sleeve allow the entire valve to be fixedly connected using only bolts, which is convenient for assembly and avoids the use of fasteners for connection at multiple locations.

A sealing gasket 18 is provided between the valve cover 13 and the valve body 1, and between the valve seat 2 and the valve body 1. The sealing gasket can increase the sealing performance of the valve and make it less likely for liquid to leak. A metal gasket 20 is provided at the bottom of the packing 14, and the metal gasket 20 is provided between the packing 14 and the valve cover 13.

A hand wheel 19 is connected to the top of the valve stem 5 for easy rotation to open or close the valve.

The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims (4)

1. A composite seal valve, comprising:

The valve comprises a valve body (1), wherein a first fluid channel (101) and a second fluid channel (102) are arranged on the left side and the right side of the valve body (1), a partition hole (103) communicated with the first fluid channel (101) and the second fluid channel (102) is further formed in the valve body (1), and an intersection of the first fluid channel (101) and the partition hole (103) is positioned above an intersection of the second fluid channel (102) and the partition hole (103);

The valve seat (2) is positioned in the partition hole (103), the valve seat (2) is positioned between two intersecting openings, the upper end of the valve seat (2) is provided with a matching part (201), the matching part (201) is internally provided with a matching hole (202), and a gap is reserved between the outer surface of the matching part (201) and the partition hole (103);

The valve comprises a first valve core (3), wherein the first valve core (3) comprises a sealing part (301) and a connecting part (302), the sealing part (301) can be inserted into a matching hole (202), after the sealing part (301) is inserted into the matching hole (202), all or part of the outer surface of the sealing part (301) is in contact with the side surface of the matching hole (202), a horizontal step surface (303) is arranged on the outer side of the transition part of the sealing part (301) and the connecting part (302), and the connecting part (302) is movably connected with a valve rod (5);

The valve comprises a first valve core (4), a second valve core (4) and a first compression spring (6), wherein a stepped hole (401) is formed in the first valve core (4), the first valve core (3) is arranged in the stepped hole (401), all or part of the side surface of the stepped hole (401) is in contact with the outer surface of a matching part (201), a connecting part (302) penetrates out of the top of the first valve core (4), the top of the first valve core (4) is positioned between a valve rod (5) and a stepped surface (303), the top surface of the first valve core (4) is in contact with the bottom surface of a valve body (1), and the first compression spring (6) is arranged between the stepped surface (303) and the first valve core (4);

The valve rod (5) extends into the bracket (7) and penetrates out of the top of the bracket (7), and the valve rod (5) is in threaded connection with the bracket (7);

the inner surface and the outer surface of the top of the matching part (201) are respectively provided with a conical surface (8), and the outer surface of the sealing part (301) and the side surface of the stepped hole (401) are respectively provided with a conical surface (8) matched with the sealing part;

the connecting part (302) is provided with a threaded hole (304), a screw rod (9) is connected in the threaded hole (304) in a threaded manner, the bottom of the valve rod (5) is provided with an inserting hole (501), the valve rod (5) is provided with a waist-shaped hole (502), the waist-shaped hole (502) penetrates through the inserting hole (501), the connecting part (302) is positioned in the inserting hole (501), two ends of the screw rod (9) are positioned in the waist-shaped hole (502), the screw rod (9) can move up and down in the waist-shaped hole (502) after the screw rod (9) is connected with the first valve core (3), and the maximum compression amount of the first compression spring (6) is larger than the maximum moving distance of the screw rod (9) in the waist-shaped hole (502);

The valve rod (5) comprises an upper valve rod (503) and a lower valve rod (504), and the upper valve rod (503) and the lower valve rod (504) are connected through a compensator (10); the upper part of the upper valve rod (503) is in threaded connection with the bracket (7), the lower part of the upper valve rod (503) is fixedly connected with the compensator (10), the lower valve rod (504) is movably connected with the compensator (10), a second compression spring (11) is arranged between the upper valve rod (503) and the lower valve rod (504), the second compression spring (11) is positioned in the compensator (10), an anti-rotation clamp (12) is fixedly connected with the side surface of the compensator (10), the anti-rotation clamp (12) is movably connected with the bracket (7), and the anti-rotation clamp (12) can only move up and down along the bracket (7);

The upper valve rod (503) comprises a trapezoidal screw rod (5031) and a trapezoidal nut (5032), the trapezoidal screw rod (5031) is in threaded connection with the trapezoidal nut (5032), the trapezoidal nut (5032) extends out of the top end of the bracket (7), and the trapezoidal nut (5032) is in rotary connection with the bracket (7);

the lower end of the bracket (7) is connected with a valve cover (13), a filler (14) is arranged in the valve cover (13), the valve rod (5) passes through the filler (14), and the valve body (1), the valve seat (2) and the valve cover (13) are fixedly connected together through bolts (15);

The partition hole (103) is internally provided with a compression sleeve (16), the bottom of the compression sleeve (16) is in contact with the valve seat (2), and the top of the compression sleeve (16) is in contact with the end face of the valve cover (13).

2. A composite seal valve as defined in claim 1, wherein: a positioning sleeve (17) is arranged between the bracket (7) and the valve cover (13), and the bolt (15) passes through the positioning sleeve (17).

3. A composite seal valve as defined in claim 1, wherein: sealing gaskets (18) are arranged between the valve cover (13) and the valve body (1) and between the valve seat (2) and the valve body (1); the bottom of the packing (14) is provided with a metal gasket (20), and the metal gasket (20) is arranged between the packing (14) and the valve cover (13).

4. A composite seal valve as defined in claim 1, wherein: the top of the valve rod (5) is connected with a hand wheel (19).