CN112303297A

CN112303297A - Swing check valve

Info

Publication number: CN112303297A
Application number: CN202011178596.6A
Authority: CN
Inventors: 韩国昊; 李红生; 邵倩倩
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-10-29
Filing date: 2020-10-29
Publication date: 2021-02-02

Abstract

The invention discloses a swing check valve which comprises a valve body, wherein a valve cavity is arranged in the valve body, and an inlet pipe and an outlet pipe are arranged on the side surface of the valve body; a valve cover is fixedly installed at an opening at the upper end of the valve cavity, a first convex plate and a second convex plate are arranged on the left side wall of the valve cavity above the inlet pipe in parallel, a horizontal shaft lever is arranged between the first convex plate and the second convex plate, a rocker is arranged on the shaft lever, and a valve clack is fixedly installed at one end of the rocker; the shaft lever is rotatably connected with a rotary table at one end extending out of the second convex plate; the valve cover is provided with a buffer assembly connected with the rotary table, one end of the shaft lever extending out of the rotary table is fixedly provided with a deflector rod, the left side of the shaft lever is provided with a convex block on the second convex plate, the convex block is provided with a first inclined plane and a second inclined plane, the rotary table is provided with a second convex column along the axial direction of the shaft lever, and the side surface of the deflector rod is provided with a third inclined plane; the swing check valve is simple in structure and can prevent water hammer.

Description

Swing check valve

Technical Field

The invention belongs to the technical field of pipeline valves, and particularly relates to a swing check valve.

Background

A check valve is a valve commonly used in pipe systems for connecting and checking a fluid medium in the pipe system. The existing swing check valve mainly comprises a valve body, a valve seat and a check valve flap, wherein the valve seat is provided with a valve seat sealing surface and fixed in a valve body flow channel, the check valve flap is provided with a valve flap sealing surface and installed in a valve body inner cavity by utilizing a pin shaft, when a medium enters the valve body inner cavity from an inlet side of a valve (medium flows forwards), the medium pushes the check valve flap to rotate around the pin shaft to open, and when the medium enters the valve body inner cavity from an outlet side of the valve (medium flows backwards), the check valve flap rotates around the pin shaft to close. The following problems often appear in the use of current swing check valve: in the process of rotating and closing the check valve clack around the pin shaft, the impact force of the sealing surface of the valve clack to the sealing surface of the valve seat is too large due to too high closing speed, so that the sealing surface is easily damaged, the check valve cannot be effectively stopped, and the service life is reduced; meanwhile, when the check valve clack is closed quickly, water hammer is easy to generate, and the valve is damaged.

Disclosure of Invention

The invention aims to provide a swing check valve which is simple in structure and can prevent water hammer.

In order to solve the technical problem, the invention provides a swing check valve which comprises a valve body, wherein a valve cavity is arranged in the valve body, and an inlet pipe and an outlet pipe which are communicated with the valve cavity are arranged on the side surface of the valve body; a valve cover is fixedly installed at an opening at the upper end of the valve cavity, a first convex plate and a second convex plate are arranged on the left side wall of the valve cavity above the inlet pipe side by side, a horizontal shaft lever is arranged between the first convex plate and the second convex plate along the axial direction perpendicular to the inlet pipe, a rocker is arranged on the shaft lever, and a valve flap for controlling the on-off of the inlet pipe is fixedly installed at one end of the rocker, which is far away from the shaft lever; a convex shoulder is arranged at one end of the shaft rod extending out of the first convex plate, a rotary table is rotatably connected at one end of the shaft rod extending out of the second convex plate, an arc-shaped groove taking the shaft rod as a circle center is arranged on the rotary table, and a first convex column extending into the arc-shaped groove is arranged on the second convex plate; the shaft rod is sleeved with a first spring between the first convex plate and the convex shoulder, and the first spring is used for forcing the convex shoulder to move in the direction away from the first convex plate; the valve cover is provided with a buffer assembly connected with the rotary table, one end of the shaft lever extending out of the rotary table is fixedly provided with a deflector rod, the left side of the shaft lever is provided with a convex block on the second convex plate, the convex block is provided with a first inclined plane and a second inclined plane, the rotary table is provided with a second convex column along the axial direction of the shaft lever, and the side surface of the deflector rod is provided with a third inclined plane; when the inlet pipe is closed by the valve clack, the deflector rod is positioned above the lug, when the inlet pipe is opened by the valve clack, the deflector rod moves to the lower side of the lug under the action of the first inclined plane and the third inclined plane, and when the inlet pipe is completely opened by the valve clack, the deflector rod moves to the right side of the second convex column under the action of the third inclined plane; in-process of import pipe to closing the import pipe is opened by the complete at the valve clack, the driving lever is contradicted and is rotated at the right side drive carousel of second projection, and control valve clack slowly moves to the import pipe under buffer assembly's effect when the carousel rotates, when the driving lever changes to the lug below and along with driving lever upward movement, the driving lever breaks away from the second projection under the effect on second inclined plane, and the carousel resets under buffer assembly's effect, and the valve clack will import the pipe and close.

Furthermore, a shaft hole is formed in the rocker along the axial direction of the shaft rod, the shaft rod is located in the shaft hole, a limiting sliding groove is formed in the side wall of the shaft hole along the axial direction of the shaft rod, and a limiting block connected in the limiting sliding groove in a sliding mode is fixedly mounted on the shaft rod.

Furthermore, the buffer assembly comprises a buffer block, a connecting rod extending into the valve cavity is arranged on the inner side wall of the valve cover in an extending mode, a buffer groove is formed in the connecting rod along the length direction of the connecting rod, a guide sliding rod is arranged in the buffer groove along the length direction of the buffer groove, and the buffer block is connected to the guide sliding rod in a sliding mode and located in the buffer groove; a buffer spring for forcing the buffer block to move upwards is sleeved between the buffer block and the bottom of the buffer groove on the guide slide rod; and a buffer connecting belt is arranged between the buffer block and the outer side of the cylinder of the turntable.

Furthermore, when the turntable resets under the action of the buffer assembly, the first convex column is positioned at the right end of the arc-shaped groove.

Furthermore, a first sealing ring is fixedly installed at the inlet pipe in the valve cavity, a second sealing ring is arranged on the valve clack, and when the inlet pipe is closed by the valve clack, the second sealing ring is tightly pressed on the first sealing ring.

Advantageous effects

Compared with the prior art, the technical scheme of the invention has the following advantages:

1. according to the invention, the deflector rod and the buffer assembly are arranged, so that the deflector rod does not act on the buffer mechanism when the valve clack is opened, and the deflector rod acts on the buffer mechanism when the valve clack is closed, so that resistance is exerted on the closing of the valve clack, the valve clack can be prevented from being quickly closed, the phenomenon of damage to a sealing surface caused by too large impact force is prevented, and the service life of the check valve can be prolonged;

2. by using the buffer mechanism, the valve clack is prevented from being closed quickly, the water hammer phenomenon is prevented, and the first sealing ring is protected from damage and other harmful conditions;

3. the invention only has buffer function in the closing process of the valve clack, and the deflector rod is separated from the buffer mechanism at the complete closing position of the valve clack, so that the valve clack can be reliably closed and sealed.

Drawings

FIG. 1 is a cross-sectional view of the present invention with the valve flap in the closed position;

FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a cross-sectional view of the present invention with the valve flap in the open position;

FIG. 4 is a cross-sectional view taken along line B-B of FIG. 3;

FIG. 5 is a partial view of FIG. 3;

FIG. 6 is a cross-sectional view taken along line C-C of FIG. 5;

FIG. 7 is a cross-sectional view of the present invention with the valve flap in the process of closing;

FIG. 8 is a cross-sectional view taken along line A-A of FIG. 7;

fig. 9-10 are three-dimensional structural views of the shift lever of the present invention.

Detailed Description

Referring to fig. 1-10, the present invention provides a swing check valve, which includes a valve body 1, wherein a valve cavity 1a is disposed in the valve body 1, and an inlet pipe 1b and an outlet pipe 1c communicated with the valve cavity 1a are disposed on a side surface of the valve body 1; the valve cover 2 is fixedly installed at an opening at the upper end of the valve cavity 1a, a first convex plate and a second convex plate are arranged on the left side wall of the valve cavity 1a side by side above the inlet pipe 1b, a horizontal shaft rod 5 is arranged between the first convex plate and the second convex plate along the axial direction perpendicular to the inlet pipe 1b, a rocker 4 is arranged on the shaft rod 5, a shaft hole 41 is formed in the rocker 4 along the axial direction of the shaft rod 5, the shaft rod 5 is located in the shaft hole 41, a limiting sliding groove 42 is formed in the side wall of the shaft hole 41 along the axial direction of the shaft rod 5, and a limiting block 43 which is connected in the limiting sliding groove 42 in a sliding manner is fixedly installed; a valve clack 3 for controlling the on-off of the inlet pipe 1b is fixedly arranged at one end of the rocker 4 far away from the shaft lever 5; a convex shoulder 51 is arranged at one end of the shaft lever 5 extending out of the first convex plate, a rotary table 6 is rotatably connected at one end of the shaft lever extending out of the second convex plate, an arc-shaped groove 61 taking the shaft lever 5 as a circle center is arranged on the rotary table 6, and a first convex column 101 extending into the arc-shaped groove 61 is arranged on the second convex plate; the shaft rod 5 is sleeved with a first spring 50 between the first convex plate and the shoulder 51, and the first spring 50 is used for forcing the shoulder 51 to move away from the first convex plate; the valve cover 2 is provided with a buffer assembly connected with the rotary table 6, one end of the shaft lever 5 extending out of the rotary table 6 is fixedly provided with a shift lever 7, the left side of the shaft lever 5 of the second convex plate is provided with a convex block 102, the convex block 102 is provided with a first inclined surface 1021 and a second inclined surface 1022, the rotary table 6 is provided with a second convex column 62 along the axial direction of the shaft lever 5, and the side surface of the shift lever 7 is provided with a third inclined surface 71.

The buffer assembly comprises a buffer block 9, a connecting rod 2a extending into the valve cavity 1a is arranged on the inner side wall of the valve cover 2 in an extending mode, a buffer groove 21 is formed in the connecting rod 2a along the length direction of the connecting rod, a guide slide rod 91 is arranged in the buffer groove 21 along the length direction of the buffer groove, and the buffer block 9 is connected to the guide slide rod 91 in a sliding mode and located in the buffer groove 21; a buffer spring 10 for forcing the buffer block 9 to move upwards is sleeved between the buffer block 9 and the bottom of the buffer groove 21 on the guide slide rod 91; and a buffer connecting belt 8 is arranged between the buffer block 9 and the outer side of the cylinder of the turntable 6. In addition, when the turntable 6 is reset under the action of the buffer assembly, the first convex column 101 is positioned at the right end of the arc-shaped groove 61.

A first sealing ring 1d is fixedly arranged at the inlet pipe 1b in the valve cavity 1a, a second sealing ring 1e is arranged on the valve clack 3, and when the inlet pipe 1b is closed by the valve clack 3, the second sealing ring 1e is tightly pressed on the first sealing ring 1 d.

In this embodiment, when the valve flap 3 closes the inlet tube 1b, the shift lever 7 is located above the protrusion 102, and the first protrusion 101 is located at the right end of the arc-shaped slot 61. When the valve clack 3 opens the inlet pipe 1b, the rocker 4 drives the shaft lever 5 to rotate, the shaft lever 5 drives the shift lever 7 to rotate when rotating, the shift lever 7 drives the shaft lever 5 to axially move under the action of the first inclined surface 1021 and the third inclined surface 71, the shaft lever 5 drives the convex shoulder 51 to compress the first spring 50, and when the shift lever 7 moves below the convex block 102, the shift lever 7 presses down on the turntable 6 under the action of the first spring 50; when the valve flap 3 completely opens the inlet pipe 1b, the shift lever 7 drives the shaft lever 5 to move axially under the action of the third inclined surface 71, the shaft lever 5 drives the shoulder 51 to compress the first spring 50, and when the shift lever 7 moves to the right of the second boss 62, the shift lever 7 presses on the rotary disc 6 under the action of the first spring 50.

In this embodiment, in the process from completely opening the inlet pipe 1b to closing the inlet pipe 1b of the valve flap 3, the shift lever 7 abuts against the right side of the second convex column 62, the rotating disc 6 is driven to rotate by the second convex column 62, the buffer block 9 is pulled to move downwards by the buffer connecting belt 8 when the rotating disc 6 rotates to compress the buffer spring 10, when the shift lever 7 rotates to the lower side of the convex block 102 and moves upwards along with the shift lever 7, the shift lever 7 is separated from the second convex column 62 under the action of the second inclined surface 1022, the buffer block 9 moves upwards under the action of the buffer spring 10 and pulls the rotating disc 6 to reset through the buffer connecting belt 8, and at this time, the valve flap 3 closes the inlet pipe 1 b.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. A swing check valve comprises a valve body, wherein a valve cavity is arranged in the valve body, and an inlet pipe and an outlet pipe which are communicated with the valve cavity are arranged on the side surface of the valve body; the valve comprises a valve cavity and a valve cover, and is characterized in that a first convex plate and a second convex plate are arranged on the left side wall of the valve cavity above an inlet pipe in parallel, a horizontal shaft rod is arranged between the first convex plate and the second convex plate along the axial direction perpendicular to the inlet pipe, a rocker is arranged on the shaft rod, and a valve flap used for controlling the on-off of the inlet pipe is fixedly arranged at one end of the rocker, which is far away from the shaft rod; a convex shoulder is arranged at one end of the shaft rod extending out of the first convex plate, a rotary table is rotatably connected at one end of the shaft rod extending out of the second convex plate, an arc-shaped groove taking the shaft rod as a circle center is arranged on the rotary table, and a first convex column extending into the arc-shaped groove is arranged on the second convex plate; the shaft rod is sleeved with a first spring between the first convex plate and the convex shoulder, and the first spring is used for forcing the convex shoulder to move in the direction away from the first convex plate; the valve cover is provided with a buffer assembly connected with the rotary table, one end of the shaft lever extending out of the rotary table is fixedly provided with a deflector rod, the left side of the shaft lever is provided with a convex block on the second convex plate, the convex block is provided with a first inclined plane and a second inclined plane, the rotary table is provided with a second convex column along the axial direction of the shaft lever, and the side surface of the deflector rod is provided with a third inclined plane; when the inlet pipe is closed by the valve clack, the deflector rod is positioned above the lug, when the inlet pipe is opened by the valve clack, the deflector rod moves to the lower side of the lug under the action of the first inclined plane and the third inclined plane, and when the inlet pipe is completely opened by the valve clack, the deflector rod moves to the right side of the second convex column under the action of the third inclined plane; in-process of import pipe to closing the import pipe is opened by the complete at the valve clack, the driving lever is contradicted and is rotated at the right side drive carousel of second projection, and control valve clack slowly moves to the import pipe under buffer assembly's effect when the carousel rotates, when the driving lever changes to the lug below and along with driving lever upward movement, the driving lever breaks away from the second projection under the effect on second inclined plane, and the carousel resets under buffer assembly's effect, and the valve clack will import the pipe and close.

2. The swing check valve of claim 1, wherein: the rocker is characterized in that a shaft hole is formed in the rocker along the axial direction of the shaft rod, the shaft rod is located in the shaft hole, a limiting sliding groove is formed in the side wall of the shaft hole along the axial direction of the shaft rod, and a limiting block connected in the limiting sliding groove in a sliding mode is fixedly mounted on the shaft rod.

3. The swing check valve of claim 2, wherein: the buffer assembly comprises a buffer block, a connecting rod extending into the valve cavity is arranged on the inner side wall of the valve cover in an extending mode, a buffer groove is formed in the connecting rod along the length direction of the connecting rod, a guide sliding rod is arranged in the buffer groove along the length direction of the buffer groove, and the buffer block is connected to the guide sliding rod in a sliding mode and located in the buffer groove; a buffer spring for forcing the buffer block to move upwards is sleeved between the buffer block and the bottom of the buffer groove on the guide slide rod; and a buffer connecting belt is arranged between the buffer block and the outer side of the cylinder of the turntable.

4. The swing check valve of claim 2, wherein: when the turntable resets under the action of the buffer assembly, the first convex column is positioned at the right end of the arc-shaped groove.

5. The swing check valve of claim 1, wherein: the valve cavity is fixedly provided with a first sealing ring at the inlet pipe, the valve clack is provided with a second sealing ring, and the second sealing ring is tightly pressed on the first sealing ring when the valve clack closes the inlet pipe.