CN112161089A

CN112161089A - Water hammer-proof slow-closing check valve

Info

Publication number: CN112161089A
Application number: CN202010991158.5A
Authority: CN
Inventors: 李宗贤; 王先菊
Original assignee: Dongguan Haite Pawo Hydraulic Technology Co ltd
Current assignee: Zhejiang Donghe Valve Manufacturing Co ltd
Priority date: 2020-09-20
Filing date: 2020-09-20
Publication date: 2021-01-01
Anticipated expiration: 2040-09-20
Also published as: CN112161089B

Abstract

The invention discloses a water hammer-resistant slow-closing check valve which comprises a valve body, wherein a valve cavity is arranged in the valve body, a transverse partition plate is arranged in the valve cavity and divides the valve cavity into an upper valve cavity and a lower valve cavity, a valve cover is fixedly installed at an opening at the upper end of the upper valve cavity, and an inlet pipe and an outlet pipe are arranged on the side surface of the valve body; a valve hole is formed in the transverse clapboard; the valve cover is internally provided with a piston hole, and the piston rod is provided with a convex shoulder which is connected in the piston hole in a sliding manner; the cross-sectional area of the shoulder is A1, the cross-sectional area of the valve rod is A2, and the cross-sectional area of the piston rod is A3, wherein A1-A2 is A3; the lower end of the piston rod is provided with a valve core for controlling the on-off of the valve hole, and the lower end of the piston rod is provided with a locking assembly and an unlocking assembly; the check valve is simple in structure, can be slowly closed, and prevents water hammer.

Description

Water hammer-proof slow-closing check valve

Technical Field

The invention belongs to the technical field of check valves, and particularly relates to a water hammer-proof slow-closing check valve.

Background

The check valve is a valve which is used for preventing the media from flowing backwards by automatically opening and closing a valve clack depending on the flowing of the media. The check valve is an automatic valve and mainly used for preventing medium from flowing backwards, preventing the pump and a driving motor from reversing and discharging container medium. According to the structural division, the check valve can be divided into a lifting check valve, a swing check valve and a butterfly check valve. The existing lifting check valve mainly comprises a valve body, a valve seat and a check valve core, when a medium enters an inner cavity of the valve body from an inlet side of the valve (the medium flows in a forward direction), the medium pushes the check valve core to ascend and open, and when the medium enters the inner cavity of the valve body from an outlet side of the valve (the medium flows in a reverse direction), the check valve core descends to close a valve port. The following problems often occur in the use process of the existing lifting check valve: in the closing process of the non-return valve core, because the closing speed is too high, the impact force of the valve core sealing surface to the sealing surface of the valve seat is too large, the sealing surface is easy to damage, the non-return valve cannot be effectively stopped, and the service life is reduced; meanwhile, when the check valve core is quickly closed, water hammer is easily generated, and the valve is damaged.

Disclosure of Invention

The invention aims to provide a check valve which is simple in structure, can be closed slowly and can prevent water hammer.

In order to achieve the purpose, the invention provides the following technical scheme:

a water hammer resistant slow-closing check valve comprises a valve body, wherein a valve cavity is arranged in the valve body, a transverse partition plate is arranged in the valve cavity and divides the valve cavity into an upper valve cavity and a lower valve cavity, a valve cover is fixedly arranged at an opening at the upper end of the upper valve cavity, and an inlet pipe and an outlet pipe are arranged on the side surface of the valve body, wherein the inlet pipe is communicated with the lower valve cavity; a valve hole used for communicating the upper valve cavity and the lower valve cavity is formed in the transverse partition plate; the valve cover is internally provided with a piston hole at the outer side of the piston rod, and the piston rod is provided with a convex shoulder which is connected in the piston hole in a sliding way at the outer side close to the upper end; the cross-sectional area of the shoulder is A1, the cross-sectional area of the valve rod is A2, and the cross-sectional area of the piston rod is A3, wherein A1-A2 is A3; an upper cavity communicated with the upper valve cavity is formed between the shoulder and the upper end of the piston hole in the piston hole, a lower cavity is formed between the shoulder and the lower end of the piston hole, and compressible gas is filled in the lower cavity; the lower end of the piston rod is provided with a valve core for controlling the on-off of the valve hole, the lower end of the piston rod is provided with a locking assembly and an unlocking assembly, the locking assembly is used for locking the valve core and the piston rod together when the valve core completely opens the valve hole, and the unlocking assembly is used for unlocking the valve core and the piston rod to be separated when the valve core is close to the valve hole.

Furthermore, the lower end of the piston rod is provided with a shaft hole, the locking assembly comprises a locking rod with a square cross section, a radial sliding hole is arranged at the upper end position close to the shaft hole in the piston rod along the radial direction of the shaft hole, and a communication hole used for communicating the radial sliding hole with the shaft hole, the locking rod is connected in the communication hole in a sliding manner, one end of the locking rod extends into the shaft hole, the other end of the locking rod extends into the radial sliding hole, the locking rod extends into the radial sliding hole from the outer side, a flange is arranged between the flange and the far center of the radial sliding hole, a first spring used for forcing the flange to drive the locking rod to extend into the shaft hole is arranged in the radial sliding hole, and a first inclined surface is arranged at;

the unlocking assembly comprises a shaft lever which is connected with the shaft hole in a sliding mode, and the lower end of the shaft lever extends out of the shaft hole and is provided with an unlocking cover; a lower sliding hole with an opening at the lower end and an upper sliding hole with an opening at the upper end are arranged in the shaft lever; the valve core is positioned in the unlocking cover, the upper end of the valve core is provided with a lower sliding rod extending into the lower sliding hole, the upper end of the lower sliding rod is provided with an upper sliding rod extending into the upper sliding hole, the upper end of the upper sliding rod is provided with a convex cover positioned at the upper end of the shaft rod, and a second spring used for forcing the convex cover to move upwards is arranged between the convex cover and the lower end of the upper sliding hole in the upper sliding hole; the gravity of the valve core is greater than the pretightening force of the second spring;

when the check valve is opened, the valve core drives the convex cover to move upwards, when the valve core abuts against the unlocking cover, the valve core drives the unlocking cover to move upwards, when the convex cover touches the first inclined surface, the convex cover pushes the locking rod to compress the first spring to retract into the communicating hole along with the upward movement of the valve core driving the convex cover, and when the valve core completely opens the valve hole, the locking rod is reset under the action of the first spring and extends into the lower part of the convex cover; when the check valve is closed, the case drives the piston rod downstream, and when the lower extreme of unblock cover contradicted on the cross slab, along with case downstream, the axostylus axostyle for case upstream motion, when the case was close to the valve opening, the upper end of axostylus axostyle touched on first inclined plane, along with case downstream, the axostylus axostyle promoted the first spring retraction intercommunication of locking lever compression downthehole, and the upper end of axostylus axostyle contradicts at the protruding lid lower extreme, and the piston rod upward movement under compressible gas action.

Furthermore, a through hole is formed in the unlocking cover.

Furthermore, a first cavity is arranged between the upper end of the lower sliding rod and the upper end of the lower sliding hole in the lower sliding hole, and a first through hole used for communicating the first cavity with the upper valve cavity is formed in the shaft rod.

Furthermore, the lower end of the valve core is provided with an annular sealing ring.

Furthermore, a second through hole used for communicating the upper valve cavity and the upper cavity is formed in the valve cover.

Advantageous effects

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

1. according to the invention, the compressible gas is filled in the lower cavity, when the valve core closes the valve hole, the valve core drives the piston rod to move downwards, so that the valve core is prevented from being closed quickly, the phenomenon of damage to the sealing surface caused by too large impact force is prevented, and the service life of the check valve is prolonged;

2. the compressible gas is filled in the lower cavity, so that when the valve core closes the valve hole, the valve core is prevented from being quickly closed, the water hammer phenomenon is prevented, and the valve is protected from damage and other harmful conditions;

3. the invention only plays a role in buffering in the closing process of the valve core, and can not generate acting force on the valve core when the valve core is opened, and the piston rod is separated from the valve core when the valve core is completely closed, so that the sealing property of the valve core when the valve core is closed can not be influenced.

Drawings

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

FIG. 2 is a cross-sectional view of the present invention when fully open;

FIG. 3 is a cross-sectional view of the unlock cover moving to the bottom when the present invention is closed;

FIG. 4 is a cross-sectional view of the valve cartridge of the present invention with the piston rod disengaged from the valve cartridge when the valve cartridge is moved to the closed position.

Detailed Description

Referring to fig. 1-4, a water hammer resistant slow-closing check valve comprises a valve body 1, a valve cavity is arranged in the valve body 1, a diaphragm plate 11 is arranged in the valve cavity, the diaphragm plate 11 divides the valve cavity into an upper valve cavity 13 and a lower valve cavity 14, a valve cover 2 is fixedly installed at an opening at the upper end of the upper valve cavity 13, and an inlet pipe 15 communicated with the lower valve cavity 14 and an outlet pipe 16 communicated with the upper valve cavity 13 are arranged on the side surface of the valve body 1; a valve hole 12 for communicating an upper valve cavity 13 and a lower valve cavity 14 is formed in the diaphragm plate 11; the piston rod 3 with the lower end extending into the upper valve cavity 13 is connected in the valve cover 2 in a sliding mode, the upper end of the piston rod 3 is provided with a valve rod 31 extending out of the valve cover 2, the outer side of the piston rod 3 in the valve cover 2 is provided with a piston hole 21, and the outer side of the piston rod 3 close to the upper end is provided with a convex shoulder 32 connected in the piston hole 21 in a sliding mode; the cross-sectional area of the shoulder 32 is A1, the cross-sectional area of the valve rod 31 is A2, and the cross-sectional area of the piston rod 3 is A3, wherein A1-A2 is A3; an upper chamber 2b communicated with the upper valve cavity 13 is formed between the shoulder 32 and the upper end of the piston hole 21 in the piston hole 21, a lower chamber 2a is formed between the shoulder 32 and the lower end of the piston hole 21, and the lower chamber 2a is filled with compressible gas; a second through hole 22 for communicating the upper valve cavity 13 with the upper cavity 2b is formed in the valve cover 2; the lower end of the piston rod 3 is provided with a valve core 5 for controlling the on-off of the valve hole 12, the lower end of the piston rod 3 is provided with a locking assembly and an unlocking assembly, the locking assembly is used for locking the valve core 5 and the piston rod 3 together when the valve core 5 completely opens the valve hole 12, and the unlocking assembly is used for unlocking the valve core 5 and the piston rod 3 to be separated when the valve core 5 is close to the valve hole 12.

The lower extreme of piston rod 3 is equipped with shaft hole 3a, locking Assembly includes that the cross section is square locking lever 7, the upper end position that is close to shaft hole 3a in the piston rod 3 is equipped with radial slide opening 3b along shaft hole 3 a's radial to and be used for communicating the intercommunicating pore 3c of radial slide opening 3b and shaft hole 3a, locking lever 7 sliding connection is in intercommunicating pore 3c and one end stretches into in shaft hole 3a, in the other end stretches into radial slide opening 3b, locking lever 7 extends in stretching into the outside in the radial slide opening 3b and is equipped with flange 7a, radial slide opening 3b is equipped with between flange 7a and the telecentric end of radial slide opening 3b and is used for forcing flange 7a to drive locking lever 7 and stretches to the first spring 8 in shaft hole 3a, locking lever 7 is equipped with first inclined plane 71 in the one end that stretches into shaft hole 3 a.

The unlocking assembly comprises a shaft lever 4 connected to the shaft hole 3a in a sliding mode, a second inclined surface 4a matched with the first inclined surface 71 is arranged at the upper end of the shaft lever 4, and the lower end of the shaft lever 4 extends out of the shaft hole 3a and is provided with an unlocking cover 41; a lower sliding hole 42 with an opening at the lower end and an upper sliding hole 43 with an opening at the upper end are arranged in the shaft lever 4; the valve core 5 is positioned in the unlocking cover 41, the upper end of the valve core is provided with a lower sliding rod 55 extending into the lower sliding hole 42, the upper end of the lower sliding rod 55 is provided with an upper sliding rod 56 extending into the upper sliding hole 43, the upper end of the upper sliding rod 56 is provided with a convex cover 51 positioned at the upper end of the shaft rod 4, and a second spring 6 used for forcing the convex cover 51 to move upwards is arranged between the convex cover 51 and the lower end of the upper sliding hole 43 in the upper sliding hole 43; the gravity of the valve core 5 is larger than the pretightening force of the second spring 6.

When the check valve is opened, the valve core 5 drives the convex cover 51 to move upwards, when the valve core 5 abuts against the unlocking cover 41, the valve core 5 drives the unlocking cover 41 to move upwards, when the convex cover 51 touches the first inclined plane 71, the convex cover 51 pushes the lock rod 7 to compress the first spring 8 to retract into the communication hole 3c along with the upward movement of the valve core 5 driving the convex cover 51, and when the valve core 5 completely opens the valve hole 12, the lock rod 7 is reset under the action of the first spring 8 and extends into the lower part of the convex cover 51; when the check valve is closed, the valve core 5 drives the piston rod 3 to move downwards, when the lower end of the unlocking cover 41 is abutted to the diaphragm plate 11, along with the downward movement of the valve core 5, the shaft rod 4 moves upwards relative to the valve core 5, when the valve core 5 is close to the valve hole 12, the upper end of the shaft rod 4 is touched on the first inclined surface 71, along with the downward movement of the valve core 5, the shaft rod 4 pushes the lock rod 7 to compress the first spring 8 to retract into the communication hole 3c, and the upper end of the shaft rod 4 is abutted to the lower end of the convex cover 51, and the piston rod 3 moves upwards under the action of the compressible.

A through hole 402 is provided in the unlock cover 41. A first chamber 222 is arranged in the lower slide hole 42 between the upper end of the lower slide rod 55 and the upper end of the lower slide hole 42, and a first through hole 401 for communicating the first chamber 222 with the upper valve cavity 13 is arranged in the shaft rod 4. The lower end of the valve core 5 is provided with an annular sealing ring 18.

According to the invention, the A1-A2 is A3, so that the medium in the outlet pipe 16 enters the upper cavity chamber 2b and acts on the annular area A1-A2 to form a downward acting force on the piston rod 3, meanwhile, the medium in the outlet pipe 16 acts on the area A3 to generate an upward acting force on the piston rod 3, because the A1-A2 is A3, the resultant force of the medium in the outlet pipe 16 on the piston rod 3 is 0, and the piston rod 3 is only acted by the gas pressure in the lower cavity chamber 2 a. At the same time, the resultant force of the medium of the outlet pipe 16 acting on the unlocking cage is also 0.

As shown in fig. 1, the valve core 5 is in the closed position, the shoulder 32 is in the uppermost position under the action of the gas pressure in the lower chamber 2a, when the inlet pipe 15 flows, the valve core 5 moves upward, the lower end of the unlocking cover abuts against the diaphragm 11 under the action of the second spring 6, the convex cover 51 is separated from the upper end of the shaft 4, when the valve core 5 moves to the position of fig. 2, the locking rod 7 retracts outward into the communication hole 3c against the action of the first spring 8 through the cooperation of the first inclined surface 71 of the locking rod 7 and the convex cover 51, and when the convex cover 51 moves above the locking rod 7, the locking rod 7 extends inward under the action of the first spring 8 and is clamped between the upper end of the shaft 4 and the convex cover 51, so that the piston rod 3, the unlocking cover and the valve core 5 are connected together.

When the medium of the inlet pipe 15 stops flowing in, under the action of the pressure of the outlet pipe 16 and the gravity of the valve core 5, the valve core 5 drives the piston rod 3 and the unlocking cover to move downwards, and because the volume of the lower chamber 2a is reduced, the pressure of the compressible gas in the lower chamber 2a is increased, the closing of the valve core 5 is hindered, and the closing speed of the valve core 5 is delayed; when the valve core 5 drives the unlocking cover to move to the position shown in fig. 3, the lower end of the unlocking cover collides with the diaphragm plate 11 and cannot move downwards continuously, the valve core 5 drives the piston rod 3 to move downwards continuously, the lock rod 7 is retracted into the communication hole 3c outwards through the matching of the second inclined surface 4a and the first inclined surface 71, when the valve core 5 moves to the complete closing position, as shown in fig. 4, the upper end of the shaft rod 4 is buckled with the convex cover 51, the valve core 5 is unlocked with the piston rod 3, and the piston rod 3 moves upwards to the position shown in fig. 1 under the action of the pressure in the lower chamber 2 a. Therefore, when the valve element 5 is in the closed position, the pressure in the lower chamber 2a does not exert an upward force on the valve element 5, and therefore does not affect the sealing performance when the valve element 5 is closed.

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 water hammer resistant slow-closing check valve comprises a valve body, wherein a valve cavity is arranged in the valve body, a transverse partition plate is arranged in the valve cavity and divides the valve cavity into an upper valve cavity and a lower valve cavity, a valve cover is fixedly arranged at an opening at the upper end of the upper valve cavity, and an inlet pipe and an outlet pipe are arranged on the side surface of the valve body, wherein the inlet pipe is communicated with the lower valve cavity; a valve hole used for communicating the upper valve cavity and the lower valve cavity is formed in the transverse partition plate; the valve is characterized in that a piston rod with the lower end extending into the upper valve cavity is connected in the valve cover in a sliding mode, a valve rod extending out of the valve cover is arranged at the upper end of the piston rod, a piston hole is formed in the valve cover on the outer side of the piston rod, and a convex shoulder connected in the piston hole in a sliding mode is arranged on the outer side of the piston rod close to the upper end; the cross-sectional area of the shoulder is A1, the cross-sectional area of the valve rod is A2, and the cross-sectional area of the piston rod is A3, wherein A1-A2 is A3; an upper cavity communicated with the upper valve cavity is formed between the shoulder and the upper end of the piston hole in the piston hole, a lower cavity is formed between the shoulder and the lower end of the piston hole, and compressible gas is filled in the lower cavity; the lower end of the piston rod is provided with a valve core for controlling the on-off of the valve hole, the lower end of the piston rod is provided with a locking assembly and an unlocking assembly, the locking assembly is used for locking the valve core and the piston rod together when the valve core completely opens the valve hole, and the unlocking assembly is used for unlocking the valve core and the piston rod to be separated when the valve core is close to the valve hole.

2. The waterproof hammer slow-closing check valve according to claim 1, wherein a shaft hole is formed in the lower end of the piston rod, the locking assembly comprises a locking rod with a square cross section, a radial sliding hole is formed in the piston rod in a position close to the upper end of the shaft hole in the radial direction of the shaft hole, and a communication hole for communicating the radial sliding hole with the shaft hole is formed in the piston rod, the locking rod is connected in the communication hole in a sliding mode, one end of the locking rod extends into the shaft hole, the other end of the locking rod extends into the radial sliding hole, a blocking edge extends into the outer side of the locking rod extending into the radial sliding hole, a first spring for forcing the blocking edge to drive the locking rod to extend into the shaft hole is arranged between the blocking edge and the telecentric end of the radial sliding hole, and a first inclined surface;

3. The water hammer resistant slow closing check valve of claim 2, wherein a through hole is provided in the unlock cover.

4. The waterproof hammer slow-closing check valve according to claim 2, wherein a first chamber is provided in the lower slide hole between an upper end of the lower slide bar and an upper end of the lower slide hole, and a first through hole for communicating the first chamber and the upper valve chamber is provided in the shaft rod.

5. The water hammer resistant slow-closing check valve according to claim 1, wherein an annular sealing ring is provided at a lower end of the valve core.

6. The waterproof hammer slow-closing check valve of claim 1, wherein a second through hole for communicating the upper valve cavity and the upper chamber is formed in the valve cover.