CN210687029U

CN210687029U - Long-life double-spool stop valve

Info

Publication number: CN210687029U
Application number: CN201921928969.XU
Authority: CN
Inventors: 邓劲才
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-06-05
Anticipated expiration: 2029-11-11

Abstract

The utility model discloses a long-life double-valve-core stop valve; belongs to the technical field of stop valves; the valve body is internally and movably provided with a valve rod, an annular valve seat is arranged in the valve body, a plurality of through holes are uniformly distributed on the valve seat at intervals along the circumferential direction, first through holes for conducting external pipelines are arranged on the valve body corresponding to the through holes, and second through holes for conducting external pipelines are arranged on the valve body corresponding to the lower end of the valve seat; a first valve core matched with an inner cavity of the valve seat is arranged at the lower part of the valve rod, the first valve core is matched with the valve seat to form a first sealing part, an installation blind hole is axially formed in the end surface of the bottom of the first valve core, a second valve core is movably sleeved in the installation blind hole, the second valve core is matched with the valve seat to form a second sealing part, and an elastic body is clamped between the bottom and the second valve core in the installation blind hole; the utility model aims at providing a long-life double-valve-core stop valve with compact structure, convenient use and good effect; used for controlling the pipeline to be conducted and closed.

Description

Long-life double-spool stop valve

Technical Field

The utility model relates to a stop valve, more specifically say, especially relate to a long-life double-core stop valve.

Background

The traditional valve only has one valve core and corresponds to one valve seat, and the valve seat is formed on a valve body by overlaying welding; the service life is short, the tightness is poor, and the valve seat is difficult to maintain and replace. Especially when the valve is applied to a high-pressure environment, when the valve core is about to contact with the sealing surface of the valve seat, the gap is gradually reduced, the pressure is gradually increased, the impact force on the sealing surface is increased, when the stop valve is frequently opened and closed, the sealing surface is repeatedly impacted, the erosion is easily caused, and the phenomenon of poor sealing is caused, so that the service life of the stop valve is shortened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to the not enough of above-mentioned prior art, provide a compact structure, convenient to use and respond well long-life double-spool stop valve.

The technical scheme of the utility model is realized like this: the utility model provides a long-life double-spool stop valve, includes the valve body, is provided with the valve rod at the valve body internalization, be provided with in the valve body and be annular disk seat, have a plurality of perforating holes along circumference interval equipartition on the disk seat, be provided with the first through-hole that switches on the outside pipeline on the valve body that the perforating hole corresponds, be provided with the second through-hole that switches on the outside pipeline on the valve body that the disk seat lower extreme corresponds.

The lower portion of the valve rod is provided with a first valve core matched with an inner cavity of the valve seat, the first valve core is matched with the valve seat to form a first sealing portion, an installation blind hole is axially formed in the end face of the bottom of the first valve core, a second valve core is movably sleeved in the installation blind hole and matched with the valve seat to form a second sealing portion, and an elastic body is clamped between the bottom of the installation blind hole and the second valve core.

A through hole and a through pin which are matched with each other are arranged in the middle of the first valve core and the second valve core along the horizontal direction, and the through hole is a long hole along the axial direction of the first valve core; when the valve rod moves downwards, the second valve core and the valve seat are firstly sealed to form a second sealing part, the valve rod continues to move downwards, and the elastic body contracts until the first valve core and the valve seat are sealed to form a first sealing part.

In the long-life double-spool stop valve, the first sealing part is a linear sealing part and is composed of a first annular sealing inclined plane and an annular end angle which are matched with each other; the first annular sealing inclined plane and the annular end angle are correspondingly arranged on the outer wall of the first valve core or the inner wall of the valve seat.

In the long-life double-spool stop valve, the annular end angle is formed by matching the lower bottom surface and the side surface of the inverted circular table part formed on the outer wall of the first spool, the first annular sealing inclined surface is formed on the inner wall of the valve seat, and the included angle α formed by the generatrix of the inverted circular table part and the horizontal plane is larger than the included angle β formed by the first annular sealing inclined surface and the horizontal plane.

In the long-life double-spool stop valve, the second spool is composed of a cylindrical guide part matched with the installation blind hole and an inverted circular truncated part integrally formed at the lower end of the cylindrical guide part; the outer diameter of the upper end of the inverted circular truncated part is larger than the inner diameter of the installation blind hole, a second annular sealing inclined surface matched with the inverted circular truncated part is formed on the valve seat, and the included angle between the bus of the inverted circular truncated part and the horizontal plane is the same as the included angle between the second annular sealing inclined surface and the horizontal plane in size.

In the long-life double-spool stop valve, the second through hole consists of a vertical hole and an inclined hole which are communicated with each other; the valve seat is characterized in that a cylindrical positioning portion matched with the inner diameter of the vertical hole is integrally formed at the lower end of the valve seat, a first annular step is formed between the outer wall of the cylindrical positioning portion and the outer wall of the valve seat, a second annular step matched with the first annular step is formed on the valve body corresponding to the upper end of the vertical hole, and a valve seat sealing gasket is clamped between the first annular step and the second annular step.

In the long-life double-spool stop valve, the upper end of the valve body on the periphery of the valve rod is fixedly connected with the valve cover through the bolt, the lower end of the valve cover is in contact with the upper end of the valve seat, and a valve cover sealing gasket is arranged at the contact part of the valve cover and the valve body.

In the long-life double-spool stop valve, the elastic body is a spring, and a positioning groove matched with the spring is arranged on the upper end surface of the second spool.

In the long-life double-spool stop valve, the penetrating pin penetrates through the second spool, and the through hole is formed in the first spool.

In the above long-life double-spool stop valve, the first through hole is a medium inlet hole, and the second through hole is a medium outlet hole

After the structure is adopted, the first valve core and the second valve core which are matched with each other are arranged and are respectively matched with the valve seat to form a first sealing part and a second sealing part; through the through-hole with wear fixed first case and the second case of pin junction to borrow by the elastomer, realize the one-level stable seal of second sealing, form the second grade by first sealing again and seal, thereby realize the two-stage and seal, its life is under equal environment, more than the twice of traditional single case stop valve at least. Has very remarkable effect.

Drawings

The present invention will be described in further detail with reference to the following examples, which are not intended to limit the invention.

Fig. 1 is a schematic structural diagram of the present invention;

fig. 2 is a partially enlarged schematic view at a in fig. 1.

In the figure: the valve comprises a valve body 1, a first through hole 1a, a second through hole 1b, a vertical hole 1c, an inclined hole 1d, a valve rod 2, a valve seat 3, a through hole 3a, a second annular sealing inclined surface 3b, a cylindrical positioning part 3c, a first valve core 4, a second valve core 5, a cylindrical guide part 5a, an inverted circular table part 5b, an elastic body 6, a third through hole 7, a through pin 8, a first annular sealing inclined surface 9, an annular end corner 10, a valve seat sealing gasket 11, a bolt 12, a valve cover 13 and a valve cover sealing gasket 14.

Detailed Description

Referring to fig. 1 and fig. 2, the utility model discloses a long-life double-spool stop valve, including valve body 1, be provided with valve rod 2 at 1 internalization of valve body, be provided with in valve body 1 and be annular disk seat 3, there are a plurality of perforating holes 3a along circumference interval equipartition on disk seat 3, are provided with the first through-hole 1a that switches on the outside pipeline on the valve body 1 that perforating hole 3a corresponds, are provided with the second through-hole 1b that switches on the outside pipeline on the valve body 1 that the 3 lower extremes of disk seat correspond. The upper end of the valve body 1 at the periphery of the valve rod 2 is fixedly connected with a valve cover 13 through a bolt 12, the lower end of the valve cover 13 is contacted with the upper end of the valve seat 3, and a valve cover sealing gasket 14 is arranged at the contact part of the valve cover 13 and the valve body 1.

The lower portion of the valve rod 2 is provided with a first valve core 4 matched with an inner cavity of the valve seat 3, the first valve core 4 is matched with the valve seat 3 to form a first sealing portion, an installation blind hole is axially formed in the end face of the bottom of the first valve core 4, a second valve core 5 is movably sleeved in the installation blind hole, the second valve core 5 is matched with the valve seat 3 to form a second sealing portion, and an elastic body 6 is clamped between the bottom of the installation blind hole and the second valve core 5. The elastic body 6 is preferably a spring, and a positioning groove adapted to the spring is arranged on the upper end surface of the second valve core 5. Meanwhile, the first sealing portion and the second sealing portion may employ any combination of a line sealing and/or a face sealing, which is a conventional technique in the art.

A third through hole 7 and a through pin 8 which are matched with each other are arranged in the middle of the first valve core 4 and the second valve core 5 along the horizontal direction, and the third through hole 7 is a long hole along the axial direction of the first valve core 4; when the valve rod 2 moves downwards, the second valve core 5 and the valve seat 3 are firstly sealed to form a second sealing portion, the valve rod 2 continues to move downwards, and the elastic body 6 contracts until the first valve core 4 and the valve seat 3 are sealed to form a first sealing portion. Specifically, in the present embodiment, the through pin 8 is disposed on the second valve core 5, and the third through hole 7 is disposed on the first valve core 4.

Preferably, the first through hole 1a is a medium inlet hole, and the second through hole 1b is a medium outlet hole, and with the structure, when the valve body is in a closed state, the outer wall of the first valve core is stressed, so that the elastomer can be prevented from being in a stressed state for a long time, meanwhile, the requirement on the elastic strength of the elastomer can be reduced, and the cost is saved.

In the embodiment, the first sealing part is a linear sealing part and is composed of a first annular sealing inclined surface 9 and an annular end corner 10 which are matched with each other, the first annular sealing inclined surface 9 and the annular end corner 10 are correspondingly arranged on the outer wall of the first valve core 4 or the inner wall of the valve seat 3, specifically, the annular end corner 10 is formed by matching the lower bottom surface and the side surface of an inverted circular table part formed on the outer wall of the first valve core 4, the first annular sealing inclined surface 9 is formed on the inner wall of the valve seat 3, and the included angle α formed by the generatrix of the inverted circular table part and the horizontal plane is larger than the included angle β formed by the first annular sealing inclined surface 9 and the horizontal plane.

Correspondingly, the second valve core 5 consists of a cylindrical guide part 5a matched with the mounting blind hole and an inverted circular truncated part 5b integrally formed at the lower end of the cylindrical guide part 5 a; the outer diameter of the upper end of the inverted circular truncated cone part 5b is larger than the inner diameter of the installation blind hole, a second annular sealing inclined surface 3b matched with the inverted circular truncated cone part 5b is formed on the valve seat 3, and the included angle between the bus of the inverted circular truncated cone part 5b and the horizontal plane is the same as the included angle between the second annular sealing inclined surface 3b and the horizontal plane in size.

Further, the second through hole 1b is composed of a vertical hole 1c and an inclined hole 1d which are communicated with each other; the lower end of the valve seat 3 is integrally formed with a cylindrical positioning portion 3c which is adaptive to the inner diameter of the vertical hole 1c, a first annular step is formed between the outer wall of the cylindrical positioning portion 3c and the outer wall of the valve seat 3, a second annular step which is matched with the first annular step is formed on the valve body 1 corresponding to the upper end of the vertical hole 1c, and a valve seat sealing gasket 11 is clamped between the first annular step and the second annular step.

When in use, the valve core is closed: when the valve rod moves downwards, the second valve core 5 contacts the valve seat 3 firstly, and the elastic body is compressed along with the downward movement of the valve rod to form a second sealing part; the valve rod moves downwards continuously, and the first valve core 4 and the valve seat 3 are sealed to form a first sealing part. Thus, two-stage sealing is formed, namely two valves are connected in series, and the valve core is closed successively to form double-channel sealing. High tightness and long service life.

The above embodiment is the preferred embodiment of the present invention, which is only used to facilitate the explanation of the present invention, it is not right to the present invention, which makes the restriction on any form, and any person who knows commonly in the technical field can use the present invention to make the equivalent embodiment of local change or modification without departing from the technical features of the present invention.

Claims

1. A long-life double-spool stop valve comprises a valve body (1), wherein a valve rod (2) is movably arranged in the valve body (1), and is characterized in that an annular valve seat (3) is arranged in the valve body (1), a plurality of through holes (3a) are uniformly distributed on the valve seat (3) at intervals along the circumferential direction, first through holes (1a) for conducting an external pipeline are formed in the valve body (1) corresponding to the through holes (3a), and second through holes (1b) for conducting the external pipeline are formed in the valve body (1) corresponding to the lower end of the valve seat (3);

a first valve core (4) matched with an inner cavity of a valve seat (3) is arranged at the lower part of a valve rod (2), the first valve core (4) is matched with the valve seat (3) to form a first sealing part, an installation blind hole is axially arranged on the end surface of the bottom of the first valve core (4), a second valve core (5) is movably sleeved in the installation blind hole, the second valve core (5) is matched with the valve seat (3) to form a second sealing part, and an elastic body (6) is clamped between the bottom in the installation blind hole and the second valve core (5);

a third through hole (7) and a through pin (8) which are matched with each other are arranged in the middle of the first valve core (4) and the second valve core (5) along the horizontal direction, and the third through hole (7) is a long hole along the axial direction of the first valve core (4); when the valve rod (2) moves downwards, the second valve core (5) and the valve seat (3) are firstly sealed to form a second sealing part, the valve rod (2) continues to move downwards, and the elastic body (6) contracts until the first valve core (4) and the valve seat (3) are sealed to form a first sealing part.

2. The long-life double-spool stop valve according to claim 1, wherein the first sealing portion is a line sealing portion which is formed by a first annular sealing inclined surface (9) and an annular end angle (10) which are mutually matched; the first annular sealing inclined plane (9) and the annular end angle (10) are correspondingly arranged on the outer wall of the first valve core (4) or the inner wall of the valve seat (3).

3. The long-life double-spool stop valve according to claim 2, characterized in that the annular end corner (10) is formed by matching the lower bottom surface and the side surface of an inverted circular truncated portion formed on the outer wall of the first spool (4), the first annular sealing inclined surface (9) is formed on the inner wall of the valve seat (3), and the included angle α formed by the generatrix of the inverted circular truncated portion and the horizontal plane is larger than the included angle β formed by the first annular sealing inclined surface (9) and the horizontal plane.

4. The long life double spool stop valve according to claim 1, wherein the second spool (5) is composed of a cylindrical guide portion (5a) fitted with the blind mounting hole and an inverted circular truncated portion (5b) integrally formed at a lower end of the cylindrical guide portion (5 a); the outer diameter of the upper end of the inverted circular truncated cone part (5b) is larger than the inner diameter of the installation blind hole, a second annular sealing inclined surface (3b) matched with the inverted circular truncated cone part (5b) is formed on the valve seat (3), and the size of an included angle between a bus of the inverted circular truncated cone part (5b) and a horizontal plane is the same as that of an included angle between the second annular sealing inclined surface (3b) and the horizontal plane.

5. The long-life double spool stop valve according to claim 1, characterized in that the second through hole (1b) is composed of a vertical hole (1c) and an inclined hole (1d) which communicate with each other; the valve seat is characterized in that a cylindrical positioning portion (3c) which is matched with the inner diameter of a vertical hole (1c) is integrally formed at the lower end of the valve seat (3), a first annular step is formed between the outer wall of the cylindrical positioning portion (3c) and the outer wall of the valve seat (3), a second annular step which is matched with the first annular step is formed on the valve body (1) corresponding to the upper end of the vertical hole (1c), and a valve seat sealing gasket (11) is clamped between the first annular step and the second annular step.

6. The long-life double-spool stop valve according to claim 1, characterized in that a valve cover (13) is fixedly connected to the upper end of the valve body (1) on the periphery of the valve rod (2) through a bolt (12), the lower end of the valve cover (13) is in contact with the upper end of the valve seat (3), and a valve cover sealing gasket (14) is arranged at the contact part of the valve cover (13) and the valve body (1).

7. The long-life double-spool stop valve according to claim 1, characterized in that the elastic body (6) is a spring, and a positioning groove adapted to the spring is arranged on the upper end surface of the second spool (5).

8. The long-life double-spool stop valve according to claim 1, characterized in that the through pin (8) is arranged on the second spool (5) and the third through hole (7) is arranged on the first spool (4).

9. The long life double spool shut-off valve according to claim 1, characterized in that said first through hole (1a) is a medium inlet hole and said second through hole (1b) is a medium outlet hole.