CN211288869U

CN211288869U - Air-discharge check valve

Info

Publication number: CN211288869U
Application number: CN201922323521.1U
Authority: CN
Inventors: 潘彦杰
Original assignee: Zhejiang Desheng Valve Technology Co ltd
Current assignee: Zhejiang Desheng Valve Technology Co ltd
Priority date: 2019-12-20
Filing date: 2019-12-20
Publication date: 2020-08-18
Anticipated expiration: 2029-12-20

Abstract

The utility model discloses an air-exhaust check valve, which comprises a valve body, a valve cover, a flow passage, a valve rod sealing cover, a valve core, a reset spring, a shifting fork and a discharge sleeve; the lower end of the valve body is provided with a square mounting hole, and a sealing element is arranged in the mounting hole; the sealing element comprises two elastic arms, a compression cavity is formed between the two elastic arms, and the compression cavity has a reset acting force which enables the two elastic arms to expand outwards; a rubber sealing sleeve which has elasticity and can seal the mounting hole is arranged between the two elastic arms; a locking angle is fixedly arranged on the outer side of the upper end of each elastic arm, and a locking boss is arranged in the mounting hole corresponding to the locking angle; the lower ends of the two elastic arms are fixedly connected. The utility model has the advantages of it is following and effect: the sampling operation can be carried out when the fluid medium circulates in the flow channel.

Description

Air-discharge check valve

Technical Field

The utility model relates to the technical field of valves, in particular to no-load check valve.

Background

The air-discharge check valve is arranged on an outlet pipeline of a high-pressure water supply pump of the thermal power generating unit, so that water supply backflow is prevented, and the water supply pump is protected. The valve is matched with a minimum flow automatic recirculation bypass of the water pump to work, and when the water feed pump is in a low-load or outlet stop valve closing state, the automatic recirculation bypass is in an opening position to ensure the safe operation of the water pump; when the empty check valve is open, the recirculation bypass is automatically closed.

In order to determine the parameters of the fluid medium in the passage of the empty discharge check valve, it is necessary to sample the fluid medium, but the empty discharge check valve seals the flow passage in the fully closed state, and sampling cannot be performed. If sampling is carried out when the empty discharge check valve is idle, the pipeline connected with the empty discharge check valve needs to be detached for sampling, the operation is very troublesome, the fluid medium in the flow channel has small quantity, and a large amount of sampling can not be carried out and big data comparison can not be carried out.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an empty check valve that arranges can carry out the sample operation when fluid medium circulates in the runner.

The above technical purpose of the present invention can be achieved by the following technical solutions: a kind of empty discharge check valve, including valve block and valve bonnet, the said valve bonnet is covered and located the upper end of the valve block, the said valve block has flow channels for the fluid medium to circulate, the said valve block is fitted with the valve stem gland bonnet on one side of the flow channel, and the valve stem gland bonnet is equipped with the valve core used for cutting off the flow channel, there are reset springs between valve stem gland bonnet and valve core, the said valve block has shifting forks linking to valve core, should shift the upper end of the fork and connect with and discharge the set; the lower end of the valve body is provided with a square mounting hole which communicates the flow passage with the outside of the valve body, and a sealing element is detachably arranged in the mounting hole; the sealing element comprises two elastic arms, a compression cavity is formed between the two elastic arms, and the compression cavity has a reset acting force for expanding the two elastic arms; a rubber sealing sleeve which has elasticity and can seal the mounting hole is arranged between the two elastic arms; a locking angle is fixedly arranged on the outer side of the upper end of each elastic arm, a locking boss is arranged in the mounting hole corresponding to the locking angle, and the position of the sealing element is locked by the abutting of the locking angle and the locking boss; the lower ends of the two elastic arms are fixedly connected.

The further setting is that: the lower extreme of locking angle fixed be provided with the location arch, the location arch be semicircle form, the upper end of locking boss set up with the protruding assorted positioning groove in location.

The further setting is that: and a sealing gasket is fixedly arranged at the upper end of the locking boss.

The further setting is that: and a compression spring is arranged in the compression cavity, and two ends of the compression spring are respectively fixed with the two elastic arms, so that the two elastic arms are expanded outwards through self reset acting force.

The further setting is that: the lower end of the sealing element is fixedly provided with a balancing weight.

The further setting is that: the lower end of the mounting hole is provided with a force application groove for a hand or a clamping tool to extend into, the elastic arm is provided with a bending section at the position of the force application groove, and the bending section bends towards the inner side of the elastic arm to form a force application groove.

The further setting is that: the force application groove is circular, threads are formed in the inner side wall of the force application groove, a lower end sealing cover with threads at the periphery is screwed into the force application groove, and the lower end sealing cover is fixed in the force application groove in a threaded fit mode.

The utility model has the advantages that:

1. the utility model realizes the communication between the flow passage and the outside of the valve body by arranging the mounting hole, and can realize the sampling of the valve body by connecting the sampling instrument; simultaneously, for quick convenient sealed mounting hole, detachable sets up the sealing member in the mounting hole, has realized quick sealed operation from this, has brought the facility for normal sample work.

2. In the utility model, two elastic arms extend into the mounting hole, and the elastic arms are provided with locking angles, so that the limit of the sealing element is realized under the matching of the locking angles and the locking bosses in the mounting hole; and the rubber sealing sleeve is arranged on the sealing element and is opened by the self outward expansion restoring force of the elastic arm, so that the rubber sealing sleeve can seal the mounting hole, the cutting of the mounting hole is realized, and the sealing performance is reliable and the effect is good in practical application.

3. The utility model discloses in, realize quick location through the cooperation of location arch and positioning groove, can not only guarantee the tight type of locking angle and the bellied cooperation of locking, more prolonged locking angle and the bellied area of contact of locking to increase the distance of both sealed faces, the leakproofness is better.

4. The utility model discloses in through set up seal ring in the upper end of locking boss, strengthen the leakproofness between locking angle and the locking boss.

5. The utility model discloses in set up compression spring and realize better expanding outward of two elastic arms, it is more stable to reset.

6. The utility model discloses in realize moving down of whole sealing member through setting up the balancing weight to guarantee that the locking angle can offset with the locking boss and realize sealedly.

7. The utility model discloses in through setting up the application of force recess, come convenience of customers to exert pressure at the elastic arm to let the upper end of two elastic arms can make the locking angle break away from the locking boss towards the compression chamber action, thereby extract the mounting hole with whole sealing member, it is very convenient.

8. The utility model discloses in through setting up the lower extreme closing cap, can not only protect the sealing member, can also play further sealed effect to prevent that the leakage of mounting hole from taking place.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment;

fig. 2 is an enlarged view of a portion a in fig. 1.

In the figure: 11. a valve body; 12. a valve cover; 13. a flow channel; 14. a valve stem sealing cover; 15. a valve core; 16. a return spring; 17. shifting a fork; 18. a discharge sleeve; 21. mounting holes; 22. locking the boss; 31. a resilient arm; 32. a compression chamber; 33. a rubber sealing sleeve; 34. locking the angle; 41. positioning the projection; 42. a positioning groove; 43. a sealing gasket; 5. a compression spring; 6. a balancing weight; 71. a force application groove; 72. a force application groove; 8. and the lower end is sealed.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1 and 2, an empty discharge check valve includes a valve body 11 and a valve cover 12, the valve cover 12 is disposed at an upper end of the valve body 11, a flow passage 13 for a fluid medium to flow is formed in the valve body 11, a valve rod sealing cover 14 is disposed on one side of the flow passage 13 of the valve body 11, a valve core 15 for cutting off the flow passage 13 is disposed on the valve rod sealing cover 14, a return spring 16 is disposed between the valve rod sealing cover 14 and the valve core 15, a pull fork 17 connected to the valve core 15 is disposed in the valve body 11, and a discharge sleeve 18 is connected to an upper end of the pull fork 17. The structure is the basic structure of the air discharge check valve, is a product which is very popular in the market and is not explained herein; the working principle is roughly as follows: fluid medium at the outlet of the water pump enters the air discharge check valve, pushes the valve core 15, overcomes the pretightening force of the return spring 16, and accordingly opens the valve core 15, enables the fluid medium to flow towards the direction of the process pipeline, and closes the recirculation bypass at the moment; when the water supply pump is in a low-load state or an outlet valve is closed, the reset spring 16 pushes the valve core 15 to move to drive the shifting fork, so that the automatic recirculation bypass is in an opening position, and the safe operation of the water pump is ensured.

The lower end of the valve body 11 is provided with a square mounting hole 21 which communicates the flow passage 13 with the outside of the valve body 11, and a sealing element is detachably arranged in the mounting hole 21; the sealing member comprises two elastic arms 31, a compression cavity 32 is formed between the two elastic arms 31, and the compression cavity 32 has a restoring acting force for expanding the two elastic arms 31; a rubber sealing sleeve 33 which has elasticity and can seal the mounting hole 21 is arranged between the two elastic arms 31; it will be appreciated that after the two resilient arms 31 are splayed apart, the rubber sealing sleeve 33 is pulled apart and the outer side of the rubber sealing sleeve 33 abuts against the inner wall of the mounting hole 21, thereby sealing the mounting hole 21.

A locking angle 34 is fixedly arranged on the outer side of the upper end of each elastic arm 31, a locking boss 22 is arranged in the mounting hole 21 corresponding to the locking angle 34, and the position of the sealing element is locked by the abutting of the locking angle 34 and the locking boss 22; the lower ends of the two elastic arms 31 are fixedly connected.

The lower end of the locking angle 34 is fixedly provided with a positioning protrusion 41, the positioning protrusion 41 is semicircular, and the upper end of the locking boss 22 is provided with a positioning groove 42 matched with the positioning protrusion 41.

It is further provided that a sealing washer 43 is fixedly provided at the upper end of the locking boss 22.

A compression spring 5 is provided in the compression chamber 32, and both ends of the compression spring 5 are fixed to the two elastic arms 31, respectively, so that the two elastic arms 31 are expanded by their own restoring force.

The lower end of the sealing element is fixedly provided with a balancing weight 6.

The lower end of the mounting hole 21 is provided with a force applying groove 71 for a hand or a clamping tool to extend into, the elastic arm 31 is provided with a bending section at the position of the force applying groove 71, and the bending section is bent towards the inner side of the elastic arm 31 to form a force applying groove 72.

Further, the force application groove 71 is circular, a thread is formed on the inner side wall of the force application groove 71, a lower end sealing cover 8 with a thread on the outer periphery is screwed into the force application groove 71, and the lower end sealing cover 8 is fixed in the force application groove 71 through thread matching.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications to the present embodiment without inventive contribution as required after reading the present specification, but all of them are protected by patent laws within the scope of the claims of the present invention.

Claims

1. An air-discharge check valve comprises a valve body (11) and a valve cover (12), wherein the valve cover (12) is arranged at the upper end of the valve body (11) in a covering manner, a flow passage (13) for a fluid medium to flow is formed in the valve body (11), a valve rod sealing cover (14) is arranged on one side of the flow passage (13) of the valve body (11), a valve core (15) for cutting off the flow passage (13) is arranged on the valve rod sealing cover (14), a return spring (16) is arranged between the valve rod sealing cover (14) and the valve core (15), a shifting fork (17) connected with the valve core (15) is arranged in the valve body (11), and the upper end of the shifting fork (17) is connected with a discharge sleeve (18); the method is characterized in that:

the lower end of the valve body (11) is provided with a square mounting hole (21) which communicates the flow passage (13) with the outside of the valve body (11), and a sealing element is detachably arranged in the mounting hole (21); the sealing element comprises two elastic arms (31), a compression cavity (32) is formed between the two elastic arms (31), and the compression cavity (32) has a restoring acting force which enables the two elastic arms (31) to expand outwards; a rubber sealing sleeve (33) which has elasticity and can seal the mounting hole (21) is arranged between the two elastic arms (31);

a locking angle (34) is fixedly arranged on the outer side of the upper end of each elastic arm (31), a locking boss (22) is arranged in the mounting hole (21) at a position corresponding to the locking angle (34), and the position of the sealing element is locked by the abutting of the locking angle (34) and the locking boss (22); the lower ends of the two elastic arms (31) are fixedly connected.

2. An empty discharge check valve according to claim 1, wherein: the lower extreme of locking angle (34) fixed be provided with location arch (41), location arch (41) be semicircle form, the upper end of locking boss (22) set up with location arch (41) assorted positioning groove (42).

3. An empty discharge check valve according to claim 2 wherein: and a sealing gasket (43) is fixedly arranged at the upper end of the locking boss (22).

4. An empty discharge check valve according to claim 1, wherein: the compression cavity (32) is internally provided with a compression spring (5), and two ends of the compression spring (5) are respectively fixed with the two elastic arms (31), so that the two elastic arms (31) are expanded outwards through self reset acting force.

5. An empty discharge check valve according to claim 1, wherein: the lower end of the sealing element is fixedly provided with a balancing weight (6).

6. An empty discharge check valve according to claim 1, wherein: the lower end of the mounting hole (21) is provided with a force application groove (71) for a hand or a clamping tool to extend into, the elastic arm (31) is provided with a bending section at the position of the force application groove (71), and the bending section is bent towards the inner side of the elastic arm (31) to form a force application groove (72).

7. An empty discharge check valve according to claim 6 wherein: the force application groove (71) is circular, threads are formed in the inner side wall of the force application groove (71), a lower end sealing cover (8) with threads on the periphery is screwed into the force application groove (71), and the lower end sealing cover (8) is fixed in the force application groove (71) in a threaded fit mode.