CN210423803U

CN210423803U - Duplex safety valve

Info

Publication number: CN210423803U
Application number: CN201921514308.2U
Authority: CN
Inventors: 余秀克; 金秀烙; 金益丰; 张俊策; 张宏; 张喷喷
Original assignee: TIANZHENG VALVE CO LTD
Current assignee: TIANZHENG VALVE CO LTD
Priority date: 2019-09-11
Filing date: 2019-09-11
Publication date: 2020-04-28
Anticipated expiration: 2029-09-11

Abstract

The utility model provides a duplex safety valve, including tee bend T shape joint and the left branch pipe and the right branch pipe that lie in its left and right sides, all be equipped with the relief valve body on left branch pipe and the right branch pipe, be equipped with hand wheel and valve rod on the left branch pipe, be equipped with the case that moves about through valve rod control in the tee bend T shape joint, left branch pipe and right branch pipe all are equipped with the disk seat that is used for with the case adaptation is sealed; a coaxial support channel is arranged on the right branch pipe, a coaxial support shaft is arranged at one end of the valve core, which is back to the valve rod, and the coaxial support shaft slides in the coaxial support channel; the tee joint comprises a tee joint T-shaped joint and is characterized in that a main pipe is arranged between the left side and the right side of the tee joint T-shaped joint, a flow distribution plate which is arranged in the middle and used for dividing fluid is arranged in the main pipe, the cross section of the flow distribution plate is streamline, and a steady flow recess which is in clearance fit with the cambered surface of the outer cylindrical wall of the valve core is arranged at one end, facing the valve core. The utility model has the advantages of reliable sealing and effective reduction of erosion.

Description

Duplex safety valve

Technical Field

The utility model relates to a valve field, concretely relates to pair relief valve.

Background

The safety valve is widely applied to pipelines of non-corrosive media and corrosive media such as water, petroleum, natural gas and steam, and has the advantages of small flow resistance, flexible opening and closing, long service life, safety, reliability, compact structure and the like. The relief valve need often overhaul the maintenance in long-time use to guarantee its safe operation, but a lot of relief valves of using at present need be closed the relief valve when maintaining, will make whole pipeline be in and cut off the off-line state after the relief valve is closed, this will bring very big inconvenience for the user, can cause very big economic loss even. On many pipelines that need continuous uninterrupted duty, for the maintenance of the convenience relief valve, can install the relief valve of changeable intercommunication generally, switch to another way when the relief valve is maintained and is overhauld, prevent to cut off the pipeline, guarantee the continuous uninterrupted duty of pipeline. However, the safety valves used at present have complicated structures, inconvenient pipeline switching operation and poor sealing performance, and are easy to cause the situation of local erosion and leakage due to the change of the flow direction of fluid after shunt switching.

SUMMERY OF THE UTILITY MODEL

Based on the problem, the utility model aims to provide a sealed reliable, effectively reduce the pair relief valve of erosion effect.

Aiming at the problems, the following technical scheme is provided: a duplex safety valve comprises a three-way T-shaped joint, wherein the left side and the right side of the three-way T-shaped joint are respectively connected with a left branch pipe and a right branch pipe, safety valve bodies are arranged on the left branch pipe and the right branch pipe, a hand wheel and a valve rod for controlling stretching through the hand wheel are arranged on the left branch pipe, a valve core for controlling left and right movement through the valve rod is arranged in the three-way T-shaped joint between the left branch pipe and the right branch pipe, and valve seats for being matched and sealed with the valve core are arranged on the left branch pipe and the three-way T-shaped joint as well as the right branch pipe and the three-way; a coaxial support channel is arranged on the right branch pipe, a coaxial support shaft is arranged at one end of the valve core, which is back to the valve rod, and the coaxial support shaft is positioned in the coaxial support channel to slide when the valve core moves left and right; the tee joint comprises a tee joint T-shaped joint and is characterized in that a main pipe is arranged between the left side and the right side of the tee joint T-shaped joint, a flow distribution plate which is arranged in the middle and used for dividing fluid to flow to a left branch pipe or a right branch pipe is arranged in the main pipe, the cross section of the flow distribution plate is streamline, and a steady flow depression which is in clearance fit with the cambered surface of the outer cylindrical wall of the valve core is arranged at one end, facing the valve core.

In the structure, the existing valve core only realizes movement through valve rod control, and the valve rod has a cantilever beam effect in the valve body, so that the valve core is easy to shake under the impact of fluid, and the sealing surface matched with the valve seat has eccentric deviation during switching to influence the sealing performance; the tee T-shaped joint is provided with the flow distribution plate, so that when the valve core is switched to different safety valve bodies, fluid flows more stably, the situation that the valve core is directly washed by turbulent flow is reduced, the erosion of the valve core and the valve seat part can be effectively reduced, the service life is prolonged, and the noise generated by cavitation bubbles is reduced.

The utility model discloses further set up to, the one end tip of coaxial back shaft dorsad case is equipped with the pressure release hole, coaxial back shaft is close to the one end of case and is equipped with the pressure release mouth that communicates with the pressure release hole on its outer cylinder wall.

In the structure, the coaxial support shaft is in sliding fit with the coaxial support channel, positive and negative pressure difference is easily generated in the coaxial support channel, and the pressure relief hole and the pressure relief opening are arranged to effectively balance the pressure difference between the coaxial support channel and the valve, so that the coaxial support shaft can move more smoothly.

The utility model discloses further set up to, still be equipped with the shaft shoulder on the outer cylinder wall of coaxial back shaft, be equipped with outer slot on the outer cylinder wall of its tip of one end of coaxial back shaft dorsad case, be equipped with the jump ring on the outer slot, the cover has the sliding sleeve with coaxial support channel sliding fit between shaft shoulder and the jump ring.

In the structure, the sliding sleeve is fixed with the clamp spring through the shaft shoulder, so that the convenience of replacement and maintenance can be improved when the sliding sleeve is worn.

The utility model discloses further set up to, the sliding sleeve is the polytetrafluoroethylene material.

In the structure, the sliding sleeve made of the polytetrafluoroethylene material has self-lubricating property, so that oil-free lubrication can be realized, the abrasion to the coaxial supporting channel is effectively reduced through the abrasion of the sliding sleeve, and the maintenance cost is conveniently reduced.

The utility model discloses further set up to, be equipped with a plurality of lubricated grooves along its axial direction interval arrangement on the outer cylinder wall of sliding sleeve.

In the structure, the lubricating groove can reduce the contact area between the sliding sleeve and the coaxial supporting channel, is convenient for accommodating dust and impurities, and can be used for storing lubricating grease when necessary.

The utility model discloses further set up to, the pressure release mouth is located the coaxial back shaft between shaft shoulder and the case on the outer cylinder wall.

In the above-mentioned structure, the sliding sleeve shelters from the pressure release mouth after avoiding setting up the sliding sleeve.

The utility model discloses further set up to, the terminal surface that left branch pipe or right branch pipe and tee bend T shape connect butt joint all is equipped with disk seat installation ladder ring rather than interior pipe wall juncture, the disk seat is the annular and installs on disk seat installation ladder ring, be equipped with the seal groove on the outer cylinder wall of disk seat, be equipped with on the seal groove with the sealed sealing washer of disk seat installation ladder intra-annular cylinder wall cooperation, its terminal surface of one end that the tee bend T shape of disk seat dorsad connects is equipped with a plurality of spring holes of seting up along its circumference direction, the spring downthehole spring that offsets with disk seat installation ladder ring terminal surface that is equipped with.

In the structure, rigid contact is avoided when the valve core is contacted with the valve seat, the valve core extrudes the valve seat to drive the valve seat to compress the spring, the valve seat can always abut against the valve core through the spring, and the sealing force is effectively ensured.

The utility model discloses further set up to, the disk seat is equipped with sealed chamfer face towards the one end terminal surface of case rather than interior cylinder wall juncture, the case is sealed with sealed chamfer face contact when case and disk seat contact.

The utility model discloses further set up to, when case one side was sealed with one of them disk seat contact, the case opposite side was sunken to be close with the stationary flow.

In the structure, the flow can be divided by the flow dividing plate as much as possible, so that the valve core is eroded by the flowing of the blocking medium which is positioned on the side of the flow dividing plate, which is contacted with the valve core, facing the valve seat as much as possible.

The utility model has the advantages that: the existing valve core only realizes movement through valve rod control, and because the valve rod has a cantilever beam effect in the valve body, the valve core is easy to shake under the impact of fluid, and the sealing surface matched with the valve seat has eccentric deviation to influence the sealing performance during switching; the tee T-shaped joint is provided with the flow distribution plate, so that when the valve core is switched to different safety valve bodies, fluid flows more stably, the situation that the valve core is directly washed by turbulent flow is reduced, the erosion of the valve core and the valve seat part can be effectively reduced, the service life is prolonged, and the noise generated by cavitation bubbles is reduced.

Drawings

Fig. 1 is a schematic view of the full-section structure of the present invention.

Fig. 2 is an enlarged schematic view of a portion a of fig. 1 according to the present invention.

Fig. 3 is an enlarged schematic view of a portion B of fig. 1 according to the present invention.

Fig. 4 is an enlarged schematic view of the part C of fig. 2 according to the present invention.

Fig. 5 is a schematic view of the cutting structure in the direction D of fig. 2 of the present invention.

The reference numbers in the figures mean: 10-a three-way T-joint; 11-a valve core; 12-a valve seat; 121-seal groove; 122-a sealing ring; 123-spring hole; 124-a spring; 125-sealing the chamfer surface; 13-main tube; 131-a splitter plate; 132-a steady flow recess; 20-left branch pipe; 21-a hand wheel; 22-a valve stem; 30-right branch pipe; 31-a coaxial support channel; 32-coaxial support shaft; 321-pressure relief holes; 322-pressure relief vent; 323-shaft shoulder; 324-outer grooves; 325-clamp spring; 326-a sliding sleeve; 327-lubrication groove; 40-safety valve body; 50-valve seat mounting step ring.

Detailed Description

The following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

Referring to fig. 1 to 5, the duplex safety valve shown in fig. 1 to 5 includes a three-way T-shaped joint 10, the left and right sides of the three-way T-shaped joint 10 are respectively connected with a left branch pipe 20 and a right branch pipe 30, the left branch pipe 20 and the right branch pipe 30 are both provided with a safety valve body 40, the left branch pipe 20 is provided with a hand wheel 21 and a valve rod 22 which is controlled to extend and retract by the hand wheel 21, a valve core 11 which is controlled to move left and right by the valve rod 22 is arranged in the three-way T-shaped joint 10 between the left branch pipe 20 and the right branch pipe 30, and the left branch pipe 20 and the three-way T-shaped joint 10 as well as the right branch pipe 30 and the three-way T-shaped joint 10 are both provided with a valve seat; a coaxial support channel 31 is arranged on the right branch pipe 30, a coaxial support shaft 32 is arranged at one end of the valve core 11, which is opposite to the valve rod 22, and the coaxial support shaft 32 is positioned in the coaxial support channel 31 to slide when the valve core 11 moves left and right; a main pipe 13 is arranged between the left side and the right side of the tee T-joint 10, a centrally arranged flow distribution plate 131 for dividing fluid to flow to the left branch pipe 20 or the right branch pipe 30 is arranged in the main pipe 13, the cross section of the flow distribution plate 131 is streamline, and a steady flow recess 132 which is in clearance fit with the cambered surface of the outer cylindrical wall of the valve core 11 is arranged at one end of the flow distribution plate 131 facing the valve core 11.

In the structure, the existing valve core only realizes movement through valve rod control, and because the valve rod has a cantilever beam effect in the valve body, the valve core is easy to shake under the impact of fluid, and the sealing surface matched with the valve seat has eccentric deviation during switching to influence the sealing performance, so that the coaxial support shaft 32 is arranged at the other side of the valve core 11, and the coaxial support shaft 32 slides in the coaxial support channel 31 when the valve core 11 moves, so that the two ends of the valve core 11 are both supported, the rigidity of the valve rod 22 is effectively improved, and the position consistency of the valve core 11 and each valve seat 12 during contact sealing is ensured; the flow distribution plate 131 is arranged on the T-shaped tee joint 10, so that when the valve core 11 is switched to different safety valve bodies 40, the fluid flows more stably, the situation that the valve core 11 is directly washed by turbulent flow is reduced, the erosion of the valve core 11 and the valve seat 12 can be effectively reduced, the service life is prolonged, and the noise generated by cavitation bubbles is reduced.

In this embodiment, a pressure relief hole 321 is formed in an end portion of the coaxial support shaft 32, which is opposite to the valve element 11, and a pressure relief opening 322 communicated with the pressure relief hole 321 is formed in an outer cylindrical wall of one end of the coaxial support shaft 32, which is close to the valve element 11.

In the above structure, since the coaxial support shaft 32 is slidably engaged with the coaxial support channel 31, a positive-negative pressure difference is easily generated in the coaxial support channel 31, and the pressure difference between the coaxial support channel 31 and the valve interior can be effectively balanced by the pressure relief hole 321 and the pressure relief opening 322, so that the coaxial support shaft 32 moves more smoothly.

In this embodiment, a shaft shoulder 323 is further disposed on the outer cylindrical wall of the coaxial support shaft 32, an outer groove 324 is disposed on the outer cylindrical wall of the end portion of the end of the coaxial support shaft 32, which is away from the valve core 11, a snap spring 325 is disposed on the outer groove 324, and a sliding sleeve 326 slidably engaged with the coaxial support channel 31 is sleeved between the shaft shoulder 323 and the snap spring 325.

In the structure, the sliding sleeve 326 is fixed with the clamp spring 325 through the shaft shoulder 323, so that the convenience of replacement and maintenance can be improved when the sliding sleeve is worn.

In this embodiment, the sliding sleeve 326 is made of teflon.

In the structure, the sliding sleeve 326 made of polytetrafluoroethylene has self-lubricating property, so that oil-free lubrication can be realized, the abrasion to the coaxial supporting channel 31 is effectively reduced through the abrasion of the sliding sleeve 326, and the maintenance cost is conveniently reduced.

In this embodiment, the outer cylindrical wall of the sliding sleeve 326 is provided with a plurality of lubricating grooves 327 arranged at intervals along the axial direction thereof.

In the above structure, the lubricating groove 327 can reduce the contact area between the sliding sleeve 236 and the coaxial supporting channel 31, so as to accommodate dust and impurities, and can be used for storing grease when necessary.

In this embodiment, the pressure relief port 322 is located on the outer cylindrical wall of the coaxial support shaft 32 between the shoulder 323 and the valve core 11.

In the above structure, the sliding sleeve is prevented from shielding the pressure relief opening 322 after the sliding sleeve 326 is arranged.

In this embodiment, the valve seat mounting stepped ring 50 is disposed at the junction of the end surface of the left branch pipe 20 or the right branch pipe 30, which is butted against the three-way T-shaped joint 10, and the inner wall of the valve seat 12, the valve seat 12 is annular and is mounted on the valve seat mounting stepped ring 50, a sealing groove 121 is disposed on the outer cylindrical wall of the valve seat 12, a sealing ring 122 that is sealed by matching with the inner cylindrical wall of the valve seat mounting stepped ring 50 is disposed on the sealing groove 121, a plurality of spring holes 123 disposed along the circumferential direction of the end surface of one end of the valve seat 12, which is away from the three-way T-shaped joint 10, are disposed on the end surface of the valve.

In the above structure, rigid contact is avoided when the valve element 11 contacts the valve seat 12, so that the valve element 11 presses the valve seat 12 to urge the valve seat 12 to compress the spring 124, the valve seat 12 can always abut against the valve element 11 through the spring 124, and the sealing force is effectively ensured.

In this embodiment, a sealing chamfered surface 125 is disposed at a boundary between an end surface of one end of the valve seat 12 facing the valve element 11 and an inner cylindrical wall thereof, and the valve element 11 contacts and seals the sealing chamfered surface 125 when the valve element 11 contacts the valve seat 12.

In this embodiment, when one side of the valve element 11 is sealed by contacting one of the valve seats 12, the other side of the valve element 11 is close to the flow stabilizing recess 132.

In the above structure, the flow is split by the flow splitting plate 131 as much as possible, so that the flow of the blocking medium flowing toward the side of the valve seat 12 in contact with the valve element 11 of the flow splitting plate 131 erodes the valve element 11 as much as possible.

The utility model has the advantages that: the existing valve core only realizes movement through valve rod control, and because the valve rod has a cantilever beam effect in the valve body, the valve core is easy to shake under the impact of fluid, and the sealing surface of the valve core matched with the valve seat generates eccentric deviation to influence the sealing performance during switching, so that the coaxial support shaft 32 is arranged at the other side of the valve core 11, and the coaxial support shaft 32 slides in the coaxial support channel 31 when the valve core 11 moves, so that the two ends of the valve core 11 are both supported, the rigidity of the valve rod 22 is effectively improved, and the position consistency of the valve core 11 and each valve seat 12 during contact sealing is ensured; the flow distribution plate 131 is arranged on the T-shaped tee joint 10, so that when the valve core 11 is switched to different safety valve bodies 40, the fluid flows more stably, the situation that the valve core 11 is directly washed by turbulent flow is reduced, the erosion of the valve core 11 and the valve seat 12 can be effectively reduced, the service life is prolonged, and the noise generated by cavitation bubbles is reduced.

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

Claims

1. The utility model provides a pair of relief valve, includes that tee bend T shape connects, the tee bend T shape connects the left and right sides and is connected with left branch pipe and right branch pipe respectively, all be equipped with relief valve body, its characterized in that on left branch pipe and the right branch pipe: the left branch pipe is provided with a hand wheel and a valve rod which is controlled to stretch by the hand wheel, a valve core which is controlled to move left and right by the valve rod is arranged in a T-shaped joint of a tee joint between the left branch pipe and the right branch pipe, and the left branch pipe and the T-shaped joint of the tee joint as well as the right branch pipe and the T-shaped joint of the tee joint are both provided with valve seats which are matched and sealed with the valve core; a coaxial support channel is arranged on the right branch pipe, a coaxial support shaft is arranged at one end of the valve core, which is back to the valve rod, and the coaxial support shaft is positioned in the coaxial support channel to slide when the valve core moves left and right; the tee joint comprises a tee joint T-shaped joint and is characterized in that a main pipe is arranged between the left side and the right side of the tee joint T-shaped joint, a flow distribution plate which is arranged in the middle and used for dividing fluid to flow to a left branch pipe or a right branch pipe is arranged in the main pipe, the cross section of the flow distribution plate is streamline, and a steady flow depression which is in clearance fit with the cambered surface of the outer cylindrical wall of the valve core is arranged at one end, facing the valve core.

2. The twin safety valve as defined in claim 1, wherein: the end part of one end of the coaxial support shaft, which is back to the valve core, is provided with a pressure relief hole, and the outer cylindrical wall of one end of the coaxial support shaft, which is close to the valve core, is provided with a pressure relief opening communicated with the pressure relief hole.

3. A twin safety valve as defined in claim 2, wherein: the coaxial support shaft is characterized in that a shaft shoulder is further arranged on the outer cylindrical wall of the coaxial support shaft, an outer groove is formed in the outer cylindrical wall of the end portion of one end, back to the valve core, of the coaxial support shaft, a clamp spring is arranged on the outer groove, and a sliding sleeve in sliding fit with the coaxial support channel is sleeved between the shaft shoulder and the clamp spring.

4. A twin safety valve as defined in claim 3, wherein: the sliding sleeve is made of polytetrafluoroethylene.

5. A twin safety valve as defined in claim 3, wherein: and a plurality of lubricating grooves which are arranged at intervals along the axial direction of the sliding sleeve are arranged on the outer cylindrical wall of the sliding sleeve.

6. A twin safety valve as defined in claim 3, wherein: the pressure relief opening is positioned on the outer cylindrical wall of the coaxial support shaft between the shaft shoulder and the valve core.

7. The twin safety valve as defined in claim 1, wherein: the valve seat mounting step ring is arranged at the joint of the end face of the left branch pipe or the right branch pipe butted with the tee T-shaped joint and the inner pipe wall of the left branch pipe or the right branch pipe, the valve seat is annular and is mounted on the valve seat mounting step ring, a sealing groove is arranged on the outer cylindrical wall of the valve seat, a sealing ring matched and sealed with the inner cylindrical wall of the valve seat mounting step ring is arranged on the sealing groove, a plurality of spring holes formed along the circumferential direction of the spring hole are formed in the end face of one end, back to the tee T-shaped joint, of the valve seat, and springs abutted to the end face of the valve.

8. The twin safety valve as defined in claim 7, wherein: and a sealing chamfer surface is arranged at the junction of the end face of one end of the valve seat facing the valve core and the inner cylindrical wall of the valve seat, and the valve core is in contact sealing with the sealing chamfer surface when the valve core is in contact with the valve seat.

9. The twin safety valve as defined in claim 1, wherein: when one side of the valve core is in contact sealing with one valve seat, the other side of the valve core is close to the flow stabilizing recess.