CN116066603A

CN116066603A - Check valve and seal assembly thereof

Info

Publication number: CN116066603A
Application number: CN202310357632.2A
Authority: CN
Inventors: 刘于群
Original assignee: Sichuan Lanfan Environmental Protection Technology Co ltd
Current assignee: Sichuan Lanfan Environmental Protection Technology Co ltd
Priority date: 2023-04-06
Filing date: 2023-04-06
Publication date: 2023-05-05
Anticipated expiration: 2043-04-06
Also published as: CN116066603B

Abstract

The invention relates to the technical field of valves and discloses a check valve and a sealing assembly thereof, wherein the check valve comprises a leakage preventing structure arranged at a valve port of a valve body and a sealing seat arranged at the valve port end of the valve body, an end cover is arranged on the sealing seat, a valve rod is connected to the end cover in a threaded manner, the valve rod penetrates through the sealing seat to extend into the valve body and is sealed through the leakage preventing structure, a telescopic sealing piece is arranged between the end cover and the top end of the sealing seat and is sealed with the valve rod, and an end plate for sealing is arranged at the bottom end of the valve rod. This check valve and seal assembly thereof, the medium gets into from the feed inlet of valve body to jack-up the valve clack, make the medium get into the discharge gate and derive through the port, when the medium is against the flow, the medium of entering the discharge gate can strike on the valve clack, closely laminate the valve clack in port department, and reset spring can make valve clack quick closure, avoid the backward flow.

Description

Check valve and seal assembly thereof

Technical Field

The invention relates to the technical field of valves, in particular to a check valve and a sealing assembly thereof.

Background

The check valve is a valve with a circular valve clack as an opening and closing part and can stop the medium from flowing backwards by the action of the self weight and the medium pressure. Belongs to automatic valves, which are also called check valves, one-way valves, reflux valves or isolation valves. The movement modes of the valve clack are divided into a lifting type and a swing type. The lifting check valve is similar to a stop valve in structure, and only lacks a valve rod for driving the valve clack. The medium flows in from the inlet end (lower side) and flows out from the outlet end (upper side). When the inlet pressure is greater than the sum of the valve flap weight and its flow resistance, the valve is opened. Otherwise, the valve is closed when the medium flows backwards. The swing check valve has a valve clack which is inclined and can rotate around the shaft, and the working principle is similar to that of the lifting check valve. Check valves are commonly used as bottom valves for pumping devices to prevent backflow of water. The check valve and the stop valve are combined for use, so that the safety isolation function can be realized, and the defect of high resistance and poor sealing performance during closing is overcome.

The check valve and the stop valve are combined for use, and can play a role in safety isolation, so that in most medium flow systems, the check valve and the stop valve are combined in a matching way, in addition, when the stop valve is in cut-off, water pressure is increased, the stop valve seals a valve rod by adopting a filler, a gap is increased due to the fact that the valve rod moves between the fillers, sealing performance of the filler is limited, after the water pressure is increased, water can permeate along the gap between the valve rod and the filler, and leakage is likely to occur after the check valve is used for a long time, and the check valve and a sealing assembly thereof are provided.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the check valve and the sealing assembly thereof, and the functions of the check valve and the stop valve are integrated, so that the check valve can be used as the stop valve at the same time, the sealing performance of the check valve is improved, and the improved check valve is easier to install.

The invention provides the following technical scheme: the sealing assembly comprises a leakage-proof structure arranged at a valve port of a valve body and a plugging seat arranged at the valve port end of the valve body, wherein an end cover is arranged on the plugging seat, a valve rod is arranged in the plugging seat, a rotatable threaded rod is arranged at the top end of the valve rod, and the threaded rod is in threaded connection with the inner side of the end cover;

the valve rod penetrates through the plugging seat to extend into the valve body and is sealed through the leakage-proof structure, the top end of the end cover and the top end of the plugging seat are sealed with the valve rod through a telescopic sealing piece, a piston used for sealing the plugging seat is arranged on the valve rod, and an end plate used for sealing is arranged at the bottom end of the valve rod;

the top of shutoff seat is seted up flutedly, flexible sealing member is including placing the sealing disk in the recess, and the both sides of sealing disk are sealed with shutoff seat and end cover through the sealing washer respectively, flexible pipe is installed to the medial surface of sealing disk, and the toper seal tube is installed to the bottom of flexible pipe, the valve rod passes the sealing disk inboard and extends to in the toper seal tube in the bottom of flexible pipe, and the bottom cladding of toper seal tube is on the valve rod and is sealed through the clamp.

Preferably, the anti-leakage structure comprises a connecting table which is arranged inside a valve port of the valve body and is annular and a sealing gasket which is arranged on the connecting table, the connecting table is in contact with the base plate through the sealing gasket, a hole through which the valve rod passes is formed in the middle of the base plate, and a sealing hole for placing sealing filler is formed in the inner side of the hole in the base plate.

Preferably, the bottom of the plugging seat is sealed with the valve port end of the valve body through a sealing ring, the bottom of the plugging seat is contacted with the backing plate and tightly pressed on the connecting table, and the top end of the end plate is contacted and sealed with the bottom end of the connecting table through the sealing ring.

Preferably, a smooth channel for the valve rod to pass through is formed in the middle of the plugging seat, a locking ring is arranged in the smooth channel at the bottom end of the plugging seat, the locking ring extends into a sealing hole of the backing plate and compresses sealing filler, and the plugging seat and the end cover are sealed through a sealing ring.

Preferably, the piston slides in a smooth passage in the block seat, and the valve stem is sealed with the smooth passage in the block seat by the piston.

Preferably, the conical sealing tube is made of elastic rubber.

Preferably, the middle part of the end plate is inlaid with a sleeve, the end plate is inserted into the bottom end of the valve rod through the sleeve and connected with the bottom end of the valve rod through a screw, and the sleeve is sealed with the bottom end of the valve rod through a sealing ring.

The check valve is provided with the sealing assembly, the feeding hole and the discharging hole are formed in the valve body, a port used for conducting between the feeding hole and the discharging hole is formed in the valve body, a valve clack used for sealing is arranged on the port in the valve body, a guide pillar is mounted on the top end of the valve clack, and the guide pillar extends to the inside of the sleeve and is connected with the reset spring.

Compared with the prior art, the invention has the following beneficial effects:

the check valve is in rotary compression fit with the valve clack through the threaded rod and the valve rod, so that the check valve function is realized, the blocking and the stopping of a medium are realized, and the installation is simple and convenient;

the leakage-proof structure of the sealing assembly is used as a first line of defense, so that water is reduced from seeping out of the valve body along the valve rod, and the valve rod and the valve body are effectively plugged;

the piston builds a second defense line, so that the piston is used for blocking the permeated water, the compression resistance is high, the leakage quantity is small, and the leakage quantity is further reduced;

the telescopic sealing piece is used as a final defense line to seal the permeated space, water is prevented from continuously permeating along the valve rod, and under the stability of the two defense lines, the impact of a large amount of water leakage on the valve rod is avoided, so that the ultrahigh sealing performance of the valve body is realized.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is a schematic view of a leak-proof structure of the present invention;

FIG. 3 is a schematic illustration of a valve stem of the present invention;

FIG. 4 is a schematic structural view of a plugging seat according to the present invention;

fig. 5 is a schematic structural view of the telescopic seal of the present invention.

In the figure: 1. a valve body; 2. a leakage preventing structure; 21. a connection station; 22. a sealing gasket; 23. a backing plate; 24. sealing filler; 25. sealing the hole; 3. a plugging seat; 31. a smooth channel; 32. a locking ring; 33. a groove; 4. an end cap; 5. a telescoping seal; 51. a sealing plate; 52. a telescopic tube; 53. a conical sealing tube; 54. a clamp; 6. an end plate; 7. a valve stem; 71. a threaded rod; 8. a sleeve; 9. a feed inlet; 10. a discharge port; 11 ports; 12. a valve flap; 13. a guide post; 14. a return spring; 15. and (3) a piston.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present disclosure more apparent, a technical solution of the embodiments of the present disclosure will be clearly and completely described in conjunction with the accompanying drawings of the embodiments of the present disclosure, and detailed descriptions of known functions and known components are omitted from the present disclosure in order to avoid unnecessarily obscuring the concept of the present disclosure.

Referring to fig. 1 and 2, a sealing assembly comprises a leakage preventing structure 2 arranged at a valve port of a valve body 1 and a sealing seat 3 arranged at the valve port end of the valve body 1, wherein a valve rod 7 is arranged in the sealing seat 3, the leakage preventing structure 2 comprises an annular connecting table 21 arranged in the valve port of the valve body 1 and a sealing gasket 22 arranged on the connecting table 21, the connecting table 21 is in contact with a backing plate 23 through the sealing gasket 22, a hole through which the valve rod 7 passes is formed in the middle of the backing plate 23, a sealing hole 25 for placing a sealing filler 24 is formed in the inner side of the hole in the backing plate 23, the bottom of the sealing seat 3 is sealed with the valve port end of the valve body 1 through a sealing ring, the bottom of the sealing seat 3 is in contact with the backing plate 23 and is tightly pressed on the connecting table 21, the sealing gasket 22 is used as a mounting platform, and the sealing filler 23 is sealed with the connecting table 21 through the sealing gasket 22, but mediums are easy to leak along the valve rod 7, and the backing plate 23 is arranged on the sealing rod 7 and is tightly pressed on the backing plate 23 through the sealing gasket 23, and the sealing filler 24 is tightly pressed in the sealing gasket 25, so that the sealing filler is prevented from being greatly affected by the sealing filler line.

Referring to fig. 1, 3 and 4, a smooth channel 31 for the valve rod 7 to pass through is provided in the middle of the plugging seat 3, a piston 15 that is located in the plugging seat 3 and slides with the smooth channel 31 is installed on the valve rod 7, the valve rod 7 is sealed with the smooth channel 31 in the plugging seat 3 by the piston 15, a locking ring 32 is installed in the smooth channel 31 at the bottom end of the plugging seat 3, the locking ring 32 extends into the sealing hole 25 of the backing plate 23 and compresses the sealing filler 24, a groove 33 for placing the telescopic sealing member 5 is provided at the top end of the plugging seat 3, the plugging seat 3 is installed at the port of the valve body 1 by a bolt, the locking ring 32 compresses the sealing filler 24, the sealing filler 24 is prevented from being filled in the sealing hole 25 under pressure, the upper and lower ports of the plugging seat 3 are sealed, therefore, the interior of the smooth channel 31 is in a closed state, the piston 15 divides the smooth channel 31 into an upper and lower parts, the piston 15 has good sealing performance, and therefore, the medium is difficult to pass through the plugging seat 3 as a second sealing line.

Referring to fig. 1 and fig. 4, it can be seen that the plugging seat 3 is provided with an end cap 4 and is sealed by a sealing ring, a rotatable threaded rod 71 is provided at the top end of the valve rod 7, and the threaded rod 71 is in threaded connection with the inner side of the end cap 4, the valve rod 7 passes through the plugging seat 3 and extends into the valve body 1 and is sealed by the anti-leakage structure 2, and the valve rod 7 is moved up and down under the threads of the inner side of the end cap 4 by rotating the threaded rod 71, so as to control the valve rod 7 to lift.

Referring to fig. 1 and 3, the top end of the end cover 4 and the top end of the plugging seat 3 are sealed by the telescopic sealing element 5 and the valve rod 7, the telescopic sealing element 5 comprises a sealing disc 51 installed between the plugging seat 3 and the end cover 4, two sides of the sealing disc 51 are respectively sealed with the plugging seat 3 and the end cover 4 by sealing rings, a telescopic tube 52 is installed on the inner side surface of the sealing disc 51, a conical sealing tube 53 is installed at the bottom end of the telescopic tube 52, the valve rod 7 passes through the inner side of the sealing disc 51 and extends from the bottom of the telescopic tube 52 to the middle conical sealing tube 53, the bottom end of the conical sealing tube 53 is wrapped on the valve rod 7 and is sealed by a clamp 54, the conical sealing tube 53 is made of elastic rubber, when the valve rod 7 is inserted into the conical sealing tube 53 and is fastened on the valve rod 7 by the clamp 54, the conical sealing tube 53 is tightly attached to the valve rod 7 by bolts on the clamp 54, gaps between the conical sealing tube 53 and the valve rod 7 are reduced, water is difficult to pass through, the telescopic tube 52 provides a movable space for the valve rod 7, the top end of the sealing disc 7 is matched with the sealing disc 51 to seal the top end of the sealing seat 3, and the sealing seat 3 is sealed by sealing the sealing wire, and the top end of the sealing seat is sealed by sealing wire, and the sealing seat 3 is sealed by sealing the sealing seat 3.

The first line of defense and the second line of defense serve for the last line of defense, the first line of defense mainly serves to prevent a large amount of water from seeping into the plugging seat 3, impact is caused on the telescopic sealing element 5, water pressure mainly impacts on the first line of defense and needs to permeate through time, the water can pass through the anti-leakage structure 2, the second line of defense is sealed by the piston 15, so that water in the plugging seat 3 needs to pass through, the water cannot pass through the piston 15, the anti-leakage structure 2 can block water, the pressure of water in the plugging seat 3 is reduced, a large amount of time is required for water to pass through the piston 15, when the water passes through the last line of defense, the water is blocked by the telescopic sealing element 5 and the valve rod 7, the top of the plugging seat 3 is closed, the valve rod 7 and the telescopic sealing element 5 are connected in a sealing manner, the water is prevented from passing through a gap between the valve rod 7 and the telescopic sealing element 5, the telescopic sealing element 5 is sealed with the top of the valve rod 7 and the plugging seat 3, otherwise, the water cannot pass through the piston 15, the water can not only enter the plugging seat 3, the water pressure can be thoroughly, the water can not completely permeate through the valve rod 5, the valve body needs to pass through the telescopic sealing element 5, and the sealing element 3 is not need to enter the plugging seat, and the plugging seat 3 is completely, the plugging seat is not needs to be closed, and the sealing valve body is not needs to be completely, and a large-sealed, and the water pressure is not needs to be completely broken, and a high enough sealing valve body, and can be sealed 3.

Referring to fig. 1 and 5, an end plate 6 for sealing is installed at the bottom end of the valve rod 7, the top end of the end plate 6 contacts and seals with the bottom end of the connecting table 21 through a sealing ring, a sleeve 8 is embedded in the middle of the end plate 6, the end plate 6 is inserted into the bottom end of the valve rod 7 through the sleeve 8 and connected with the bottom end of the valve rod 7 through screws, the sleeve 8 seals with the bottom end of the valve rod 7 through the sealing ring, the end plate 6 adopts a detachable structure so as to be convenient to install, and when the valve rod 7 passes through the plugging seat 3 and the leakage-proof structure 2, the end plate 6 is installed at the bottom end of the valve rod 7, and in addition, the end plate 6 seals with the bottom end of the backing plate 23 through the sealing ring, so that in the medium flowing process, the long-term flushing of gaps between the valve rod 7 and the leakage-proof structure 2 caused by excessive medium pressure is avoided, and the tightness of the gap is affected.

The check valve is provided with the sealing assembly, the feed inlet 9 and the discharge outlet 10 are arranged in the valve body 1, the port 11 used for conducting between the feed inlet 9 and the discharge outlet 10 is arranged in the valve body 1, the valve clack 12 used for sealing is arranged on the port 11 in the valve body 1, the guide pillar 13 is arranged at the top end of the valve clack 12, the guide pillar 13 extends to the inside of the sleeve 8 and is connected with the return spring 14, medium enters from the feed inlet 9 of the valve body 1 and pushes up the valve clack 12, the medium enters the discharge outlet 10 through the port 11 and is led out, when the medium flows back, the medium entering the discharge outlet 10 can impact on the valve clack 12, the valve clack 12 is tightly attached to the port 11, the return spring 14 can enable the valve clack 12 to be quickly closed, backflow is avoided, and the end plate 6 is sealed with the bottom end of the backing plate 23 for a long time through the sealing ring, as the medium flows from the feed inlet 9 to the discharge outlet 10, if the medium pressure is too high, the medium permeates from the gaps of the end plate 6 and the backing plate 23 and the connecting table 21 and the backing plate 23, the gaps need to be filled, the medium leaks, the medium can be prevented from the sealing ring and the medium can be prevented from being flushed down on the end plate 6 and the end plate 23 for a long time, and the medium can be prevented from being deformed, and the medium can be prevented from being additionally, and deformed, and the medium is prevented from being caused.

When the threaded rod 71 is rotated to enable the valve rod 7 to move downwards and drive the end plate 6 to move downwards and press the guide post 13, the valve clack 12 is pressed on the port 11 to be tightly sealed and can be used as a stop valve, so that the check valve can be used as a check valve and a stop valve in a self-function, the check valve can be switched, when the check valve is used as the stop valve, the end plate 6 moves downwards, a gap between the base plate 23 and the valve rod 7 is easy to expose, media is easy to permeate, and the media is easy to permeate through multiple defense lines.

The valve rod 7 is controlled to lift through the threaded rod 71, so that the end plate 6 at the bottom of the valve rod 7 moves along with the valve rod 7, when the end plate 6 is in contact with the backing plate 23, the return spring 14 in the sleeve 8 is in a conventional compression state, the valve clack 12 can penetrate into the sleeve 8 through the guide post 13 to squeeze the return spring 14 under the impact of a medium, the valve clack 12 is in a free state, the medium can pass through in a unidirectional way, when the end plate 6 is separated from the backing plate 23 and moves downwards, the guide post 13 penetrates into the sleeve 8 to compress the return spring 14 to the limit, the valve clack 12 cannot move under the pressure of the return spring 14 and the sleeve 8, the port 11 is thoroughly blocked, the medium cannot pass through, and therefore, the state can be switched by rotating the threaded rod 71.

The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, the scope of which is defined by the claims. Various modifications and equivalent arrangements of this invention will occur to those skilled in the art, and are intended to be within the spirit and scope of the invention.

Claims

1. A seal assembly, characterized in that: the anti-leakage valve comprises an anti-leakage structure (2) arranged at a valve port of a valve body (1) and a plugging seat (3) arranged at the valve port end of the valve body (1), wherein an end cover (4) is arranged on the plugging seat (3), a valve rod (7) is arranged in the plugging seat (3), a rotatable threaded rod (71) is arranged at the top end of the valve rod (7), and the threaded rod (71) is in threaded connection with the inner side of the end cover (4);

the valve rod (7) penetrates through the plugging seat (3) to extend into the valve body (1) and is sealed through the leakage-proof structure (2), the end cover (4) and the top end of the plugging seat (3) are sealed with the valve rod (7) through the telescopic sealing piece (5), a piston (15) for sealing the plugging seat (3) is mounted on the valve rod (7), and an end plate (6) for sealing is mounted at the bottom end of the valve rod (7);

the sealing device is characterized in that the top end of the sealing seat (3) is provided with a groove (33), the telescopic sealing piece (5) comprises a sealing disc (51) placed in the groove (33), two sides of the sealing disc (51) are respectively sealed with the sealing seat (3) and the end cover (4) through sealing rings, a telescopic pipe (52) is installed on the inner side surface of the sealing disc (51), a conical sealing pipe (53) is installed at the bottom end of the telescopic pipe (52), the valve rod (7) penetrates through the inner side of the sealing disc (51) and extends from the bottom of the telescopic pipe (52) to the middle conical sealing pipe (53), and the bottom end of the conical sealing pipe (53) is coated on the valve rod (7) and is sealed through a clamp (54).

2. A seal assembly as defined in claim 1, wherein: the anti-leakage structure (2) comprises a connecting table (21) which is arranged inside a valve port of the valve body (1) and is annular and a sealing gasket (22) which is arranged on the connecting table (21), the connecting table (21) is in contact with a base plate (23) through the sealing gasket (22), a hole through which a valve rod (7) passes is formed in the middle of the base plate (23), and a sealing hole (25) for placing sealing filler (24) is formed in the inner side of the hole in the base plate (23).

3. A seal assembly as claimed in claim 2, wherein: the bottom of shutoff seat (3) is sealed with the valve port end of valve body (1) through the sealing washer, and the bottom of shutoff seat (3) and backing plate (23) contact and compress tightly it on connecting bench (21), the top of end plate (6) is through the bottom contact and the sealing of sealing washer and connecting bench (21).

4. A seal assembly as claimed in claim 2, wherein: the middle part of shutoff seat (3) has offered smooth passageway (31) that are used for valve rod (7) to pass through, and installs locking ring (32) in the smooth passageway (31) of bottom of shutoff seat (3), and locking ring (32) extend into sealed hole (25) of backing plate (23) and compress tightly sealed packing (24), seal through the sealing washer between shutoff seat (3) and end cover (4).

5. A seal assembly as defined in claim 4, wherein: the piston (15) slides in the smooth channel (31) in the plugging seat (3), and the valve rod (7) is sealed with the smooth channel (31) in the plugging seat (3) through the piston (15).

6. A seal assembly as defined in claim 1, wherein: the conical sealing tube (53) is made of elastic rubber.

7. A seal assembly as defined in claim 1, wherein: the middle part of end plate (6) is inlayed and is had sleeve pipe (8), and end plate (6) are inserted the bottom of valve rod (7) and are passed through screw connection through sleeve pipe (8), sleeve pipe (8) are sealed with valve rod (7) bottom through the sealing washer.

8. A check valve, characterized in that: the sealing assembly according to any one of claims 1-7, wherein a feed inlet (9) and a discharge outlet (10) are arranged in the valve body (1), a port (11) for conducting between the feed inlet (9) and the discharge outlet (10) is arranged in the valve body (1), a valve clack (12) is arranged in the valve body (1), a guide pillar (13) is arranged at the top end of the valve clack (12), and the guide pillar (13) extends into the sleeve (8) and is connected with a reset spring (14).