CN113494620A

CN113494620A - Gate valve

Info

Publication number: CN113494620A
Application number: CN202110849298.3A
Authority: CN
Inventors: 刘玉连; 郑飞; 吕繁荣
Original assignee: Individual
Current assignee: Guotaitong Energy Equipment Group Co ltd
Priority date: 2021-07-27
Filing date: 2021-07-27
Publication date: 2021-10-12
Anticipated expiration: 2041-07-27
Also published as: CN113494620B

Abstract

The invention relates to a gate valve which comprises a valve body, a valve cover fixedly connected to the valve body, a gate plate, a valve rod and a handle fixedly connected with the valve rod, wherein the gate plate, the valve rod and the handle are arranged in the valve body, the valve body is provided with a main flow passage communicated or separated by the gate plate, the lower end of the valve rod is connected with a screw rod through a flat key, the lower part of the screw rod is in threaded connection with the gate plate and is used for driving the gate plate to move up and down when the screw rod rotates, and the gate valve further comprises a double-layer valve seat adjusting device. According to the invention, by using the double-layer valve seat adjusting device, after the sealing element on the outer valve seat is abraded and leaked, the inner valve seat is automatically pushed out and the outer valve seat returns, so that the inner valve seat and the flashboard are sealed and normally used, the service life of the gate valve is prolonged, and the gate valve is convenient and quick to replace.

Description

Gate valve

Technical Field

The invention relates to the field of pipeline valves, in particular to a gate valve.

Background

The gate valve controls the opening and closing of the valve by the lifting of the flashboard, the flashboard is perpendicular to the direction of fluid, and the size of a channel is changed by changing the relative position between the flashboard and a valve seat, so that the gate valve is widely applied to the fields of petroleum, petrifaction, chemical engineering, metallurgy, electric power, water conservancy, water heating, urban construction, fire fighting, machinery and the like. Due to the specific structure of the gate valve, the sealing element and the gate plate can generate large friction in the opening and closing processes of the gate plate, and the gate plate and the sealing element can be abraded after long-time work, so that the service life of the gate valve is influenced; the gate valve needs to be maintained and detached from the pipeline, so that the process is complicated, and the work of the whole system is influenced; the present invention is designed to solve the above problems.

Disclosure of Invention

In view of the above, it is desirable to provide a gate valve having a double-layered valve seat.

The invention discloses a gate valve, which comprises a valve body, a valve cover fixedly connected to the valve body, a gate plate, a valve rod and a handle fixedly connected with the valve rod, wherein the gate plate, the valve rod and the handle are arranged in the valve body, the valve body is provided with a main flow passage communicated or separated by the gate plate, the lower end of the valve rod is connected with a screw rod through a flat key, the lower part of the screw rod is in threaded connection with the gate plate and is used for driving the gate plate to move up and down when the screw rod rotates, the gate valve also comprises a double-layer valve seat adjusting device, and the double-layer valve seat adjusting device comprises: the two adjusting cavities are symmetrically arranged in the valve body and are respectively positioned on two sides of the flashboard, each adjusting cavity is connected with an outer valve seat and an inner valve seat in a sliding mode, the inner valve seats are attached to the inner wall of the outer valve seats in a sliding mode, a first cavity is formed between one end, away from the flashboard, of each inner valve seat and the inner wall of each adjusting cavity, a first spring used for pushing the inner valve seats to move towards one side, away from the flashboard, of each inner valve seat is installed in each first cavity, and a second cavity is formed between one end, away from the flashboard, of each outer valve seat and the inner wall of each adjusting cavity; the movable cavity is formed in the top surface of the screw rod, the lower portion of the valve rod is connected into the movable cavity in a sliding mode, a positioning groove is formed in the side wall of the movable cavity, two movable cavities are formed in the bottom surface of the movable cavity, the bottom surface of each movable cavity is communicated with a first flow channel extending to the outer side face of the upper portion of the screw rod, the first flow channel is communicated with a second flow channel formed in the valve cover, the second flow channel is communicated with a third flow channel, and a fourth flow channel is communicated between the third flow channel and the second cavity; the two moving plungers are respectively connected in the two moving cavities in a sliding mode, and a second spring is arranged between each moving plunger and each moving cavity; the limiting cavity is formed in the lower portion side wall, facing one side of the positioning groove, of the valve rod, a positioning plunger is connected to the limiting cavity in a sliding mode, and the positioning plunger is used for pushing the positioning plunger to be clamped into the positioning spring of the positioning groove.

In one embodiment, a key groove is formed in the inner wall of the movable cavity, the flat key is slidably connected into the key groove, and a first balance hole located above the flat key is communicated between the limiting cavity and the key groove.

In one embodiment, the bottom end of the valve body is hermetically connected with a service seat.

In one embodiment, a second balance hole is communicated between the first chamber and the main flow passage.

In one embodiment, a threaded hole is formed in the center of the shutter, and the threaded hole is in threaded connection with the screw rod.

In one embodiment, a mounting groove communicated with the first balance hole is formed in one side, away from the positioning groove, of the positioning plunger, and one end of the positioning spring abuts against the mounting groove.

In one embodiment, a sealing ring is fixedly connected to each of the outer valve seat and the inner valve seat on one side facing the gate plate.

In one embodiment, the regulating cavity is filled with a liquid medium.

The invention has the beneficial effects that:

1. through using double-deck disk seat adjusting device, the back is revealed in the sealing member production wearing and tearing on outer disk seat, and interior disk seat is automatic to be pushed out and outer disk seat returns for interior disk seat and flashboard are sealed and are carried out normal use, thereby prolong the life of this gate valve.

2. Through using double-deck disk seat adjusting device, the back is revealed in the sealing member production wearing and tearing on outer disk seat, just can control interior disk seat through the propelling valve rod and release in order to carry out work, convenient and fast improves work efficiency.

Drawings

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

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

FIG. 3 is an enlarged view taken at I of FIG. 1 according to the present invention.

In the figure, the service seat 1, the gate plate 2, the threaded hole 21, the screw rod 3, the movable cavity 31, the key groove 32, the positioning groove 33, the movable cavity 34, the first flow passage 35, the valve rod 4, the movable plunger 41, the limiting cavity 42, the first balance hole 43, the handle 5, the valve body 6, the adjusting cavity 61, the first chamber 62, the second chamber 63, the third flow passage 64, the fourth flow passage 65, the main flow passage 66, the second balance hole 67, the valve cover 7, the second flow passage 71, the inner valve seat 8, the outer valve seat 9, the first spring 10, the flat key 11, the positioning plunger 12, the positioning spring 13 and the second spring 14.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It will be understood that when an element is referred to as being "mounted on" another element, it can be directly on the other element or intervening elements may also be present. When a component is referred to as being "disposed on" another component, it can be directly on the other component or intervening components may also be present. When an element is referred to as being "secured to" another element, it can be directly secured to the other element or intervening elements may also be present.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "or/and" includes any and all combinations of one or more of the associated listed items.

As shown in fig. 1, 2, and 3, a gate valve includes a valve body 6, a valve cover 7 fixedly connected to the valve body 6, a gate plate 2 installed in the valve body 6, a valve rod 4, and a handle 5 fixedly connected to the valve rod 4, the valve body 6 is provided with a main flow passage 66 communicated or blocked by the gate plate 2, the lower end of the valve rod 4 is connected with a screw rod 3 through a flat key 11, the lower part of the screw rod 3 is connected with the gate plate 2 through a thread so as to drive the gate plate 2 to move up and down when the screw rod 3 rotates, the gate valve further includes a double-layer valve seat adjusting device, the double-layer valve seat adjusting device includes: the two adjusting cavities 61 are symmetrically arranged in the valve body 6 and are respectively located on two sides of the gate plate 2, each adjusting cavity 61 is connected with an outer valve seat 9 and an inner valve seat 8 in a sliding mode, the inner valve seats 8 are attached to the inner wall of the outer valve seats 9 in a sliding mode, a first cavity 62 is formed between one end, away from the gate plate 2, of each inner valve seat 8 and the inner wall of the adjusting cavity 61, a first spring 10 used for pushing the inner valve seats 8 to move towards one side away from the gate plate 2 is installed in each first cavity 62, and a second cavity 63 is formed between one end, away from the gate plate 2, of each outer valve seat 9 and the inner wall of the adjusting cavity 61; the movable cavity 31 is arranged on the top surface of the screw rod 3, the lower part of the valve rod 4 is slidably connected in the movable cavity 31, the side wall of the movable cavity 31 is provided with a positioning groove 33, the bottom surface of the movable cavity 31 is provided with two movable cavities 34, the bottom surface of each movable cavity 34 is communicated with a first flow channel 35 extending to the outer side surface of the upper part of the screw rod 3, the first flow channel 35 is communicated with a second flow channel 71 arranged on the valve cover 7, the second flow channel 71 is communicated with a third flow channel 64, and a fourth flow channel 65 is communicated between the third flow channel 64 and the second chamber 63; two moving plungers 41 respectively connected in a sliding manner to the two moving cavities 34, wherein a second spring 14 is installed between the moving plungers 41 and the moving cavities 34; spacing chamber 42, set up in the lower part lateral wall of valve rod 4 towards constant head tank 33 one side, sliding connection has location plunger 12 in spacing chamber 42, location plunger 12 with install between the spacing chamber 42 and be used for promoting location plunger 12 is gone into the location spring 13 of constant head tank 33.

Preferably, as shown in fig. 1 and 3, a key groove 32 is formed in an inner wall of the movable cavity 31, the flat key 11 is slidably connected in the key groove 32, and a first balance hole 43 located above the flat key 11 is communicated between the limiting cavity 42 and the key groove 32.

Preferably, as shown in fig. 1, the bottom end of the valve body 6 is hermetically connected with the service seat 1.

Preferably, as shown in fig. 1, a second balance hole 67 is communicated between the first chamber 62 and the main flow passage 66.

Preferably, as shown in fig. 1 and 2, a threaded hole 21 is opened at the center of the shutter 2, and the threaded hole 21 is in threaded connection with the screw 3.

Preferably, as shown in fig. 1 and 3, an installation groove communicating with the first balance hole 43 is formed on a side of the positioning plunger 12 away from the positioning groove 33, and one end of the positioning spring 13 abuts against the installation groove.

Preferably, as shown in fig. 1 and 2, sealing rings are fixedly connected to both sides of the outer valve seat 9 and the inner valve seat 8 facing the shutter 2.

Preferably, the adjustment chamber 61 is filled with a liquid medium, it being understood that said medium is incompressible and therefore allows to accurately control the movement of the outer 9 and inner 8 seats.

The working principle of the invention is as follows:

when the gate valve needs to be used, the gate valve is connected into a pipeline, the valve rod 4 is driven to rotate through the rotary handle 5, the screw rod 3 is driven to rotate through the flat key 11, and the handle 5 is driven to rotate to drive the flashboard 2 to move up and down due to the threaded connection of the screw rod 3 and the flashboard 2, so that the gate valve can be controlled to be opened and closed; at this time, the first spring 10 acts on the inner valve seat 8, so that the inner valve seat 8 is far away from the gate plate 2, the outer valve seat 9 can be close to the gate plate 2 and abutted against the valve seat 8 because the adjusting cavity 61 is a sealing cavity, and the force acting on the inner valve seat 8 by the medium inside the pipeline is larger than the force acting on the outer valve seat 9 because the cross-sectional area of the first chamber 62 and the cross-sectional area of the inner valve seat 8 are larger than the cross-sectional area of the outer valve seat 9, and when the medium pressure is higher, the sealing can be stable. So that the outer valve seat 9 is always in the position shown in figure 1 when the shutter 2 is opened and closed; so that the shutter 2 and the two outer seats 9 can form a stable seal.

When the leakage occurs during the long-time operation of the gate valve, at this time, the inner valve seat 8 needs to replace the outer valve seat 9 to normally operate, so that the valve rod 4 is pushed downwards, the two movable plungers 41 respectively overcome the second spring 14 to move downwards, the medium in the movable cavity 34 is pushed into the first flow passage 35, enters the second chamber 63 through the first flow passage 35, the second flow passage 71, the third flow passage 64 and the fourth flow passage 65, and further pushes the outer valve seat 9 to move outwards, because the medium is filled in the adjustment cavity 61, when the outer valve seat 9 moves outwards, the medium in the adjustment cavity 61 pushes the inner valve seat 8 to overcome the first spring 10 to move towards the center until the two inner valve seats 8 are respectively attached to the gate plate 2 to form a seal, at this time, the positioning plunger 12 just moves to the positioning groove 33, and under the action of the positioning spring 13, the positioning plunger 12 enters the positioning groove 33, so as to position the valve rod 4, as shown in fig. 2 and 3, the inner valve seat 8 is held at the position shown in fig. 2, and the replacement operation is completed, thereby increasing the service life of the gate valve.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. The utility model provides a gate valve, including valve body, fixed connection in valve gap on the valve body, install in flashboard, valve rod in the valve body and with valve rod fixed connection's handle, the valve body be provided with by the sprue of flashboard intercommunication or wall, its characterized in that, the lower extreme of valve rod is connected with the screw rod through the parallel key, the lower part of screw rod with flashboard threaded connection is used for driving when the screw rod rotates the flashboard reciprocates, the gate valve still include double-deck disk seat adjusting device, double-deck disk seat adjusting device includes:

the two adjusting cavities are symmetrically arranged in the valve body and are respectively positioned on two sides of the flashboard, each adjusting cavity is connected with an outer valve seat and an inner valve seat in a sliding mode, the inner valve seats are attached to the inner wall of the outer valve seats in a sliding mode, a first cavity is formed between one end, away from the flashboard, of each inner valve seat and the inner wall of each adjusting cavity, a first spring used for pushing the inner valve seats to move towards one side, away from the flashboard, of each inner valve seat is installed in each first cavity, and a second cavity is formed between one end, away from the flashboard, of each outer valve seat and the inner wall of each adjusting cavity;

the movable cavity is formed in the top surface of the screw rod, the lower portion of the valve rod is connected into the movable cavity in a sliding mode, a positioning groove is formed in the side wall of the movable cavity, two movable cavities are formed in the bottom surface of the movable cavity, the bottom surface of each movable cavity is communicated with a first flow channel extending to the outer side face of the upper portion of the screw rod, the first flow channel is communicated with a second flow channel formed in the valve cover, the second flow channel is communicated with a third flow channel, and a fourth flow channel is communicated between the third flow channel and the second cavity;

the two moving plungers are respectively connected in the two moving cavities in a sliding mode, and a second spring is arranged between each moving plunger and each moving cavity;

the limiting cavity is formed in the lower portion side wall, facing one side of the positioning groove, of the valve rod, a positioning plunger is connected to the limiting cavity in a sliding mode, and the positioning plunger is used for pushing the positioning plunger to be clamped into the positioning spring of the positioning groove.

2. The gate valve of claim 1, wherein the inner wall of the movable cavity is provided with a key groove, the flat key is slidably connected in the key groove, and a first balance hole located above the flat key is communicated between the limiting cavity and the key groove.

3. The gate valve of claim 1, wherein the bottom end of the valve body is sealingly connected to a service seat.

4. The gate valve of claim 1, wherein a second balancing hole communicates between the first chamber and the primary flow passage.

5. The gate valve of claim 1, wherein a threaded hole is formed in the center of the gate plate, and the threaded hole is in threaded connection with the screw.

6. The gate valve of claim 2, wherein a mounting groove communicated with the first balance hole is formed on a side of the positioning plunger away from the positioning groove, and one end of the positioning spring abuts against the mounting groove.

7. The gate valve of claim 1, wherein a sealing ring is fixedly connected to each of the outer and inner valve seats on a side facing the gate plate.

8. Gate valve according to claim 1, characterised in that the regulating chamber is filled with a liquid medium.