High pressure swing type check valve with external pin

Abstract

The application relates to the technical field of valve body devices, and particularly discloses an outer-through-pin high-pressure swing check valve; the valve body comprises a medium channel communicated linearly by a forward-flow port and a reverse-flow port, and an installation channel is arranged vertically on the valve body between the forward-flow port and the reverse-flow port and relative to the medium channel; in the check valve, the sealing improvement design of the traditional valve body at the pin shaft position greatly improves the assembly sealing property at the position, improves the sealing reliability, avoids the problem of sealing failure caused by leakage during the flow of high-pressure medium, and the traditional whole-structure valve disc is optimally designed into a multilayer segmented structure, so that the buffer, barrier and consumption of the beating and collision can be effectively formed, and the problems of rupture and damage of the valve disc and sealing failure after long-term use are avoided.

Description

Technical Field

[0001] This invention relates to the field of valve body device technology, and specifically proposes an external pin high-pressure swing check valve. Background Technology

[0002] Swing check valves, also known as one-way valves or non-return valves, are used to prevent backflow of media in pipelines. They are active valves, with a valve disc that can rotate horizontally around a pivot as the main opening and closing element. The opening and closing element opens or closes automatically by the flow and force of the media. They are generally installed horizontally. When the media flows in the forward direction, the valve disc is open; when the media flows backward, the valve disc is closed, thus preventing backflow.

[0003] The existing swing check valve has the following problems in use: 1) In the swing check valve, the valve disc is used as the movable control opening and closing element. The valve disc is oscillating by rocker arm, and the rocker arm rotates on the pin shaft, which is inserted and fixed on the valve body. During long-term use, when the pressure of the flowing medium is too high, the medium leakage problem will occur at the pin shaft assembly position, and the sealing performance of the valve body will be greatly reduced.

[0004] 2) When there are opposing flowing media on both sides of the valve disc in the valve body channel, and the media pressure on both sides is close to equilibrium and in a "tug-of-war" state, the valve disc and the sealing end face inside the valve body are in a reciprocating striking state. This will not only generate a lot of abnormal noise, but more importantly, if the valve disc itself is made of brittle materials, such as cast iron or brass, long-term striking will cause the valve disc to crack and be damaged, resulting in sealing failure and inability to play the role of one-way check. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides an externally pinned high-pressure swing check valve, which solves the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention employs the following technical solution: an external pin high-pressure swing check valve, comprising a valve body, the valve body including a medium channel that is linearly connected to a forward flow port and a reverse flow port, and an installation channel located between the forward flow port and the reverse flow port and perpendicular to the medium channel on the valve body; the valve body is equipped with a swing check valve opening and closing element for controlling the unidirectional flow of the medium in the medium channel.

[0007] The swing check valve opening and closing device includes a valve seat, a swing assembly, and a valve disc; the valve seat is annular and fixed in the medium channel on one side of the installation channel near the downstream port; the swing assembly includes an external pin assembly and a rocker arm; the external pin assembly includes a packing pin that extends horizontally from the outside into the installation channel, a collar packing sleeved on the packing pin from one side of the outer shaft end, and a pin end cap detachably fixed to the outer wall of the valve body; the packing pin is axially perpendicular to the medium channel and is detachably fixed to the pin end cap, which has a packing pressure ring sleeved on the packing pin and pressing against the collar packing; one end of the rocker arm is rotatably mounted on the packing pin, and the valve disc is fixed to the rocker arm.

[0008] Preferably, the valve disc includes a base disc, an opening / closing disc, an inner spring, and a damping washer; the base disc is fixed to the rocker arm, and a keyway sleeve is coaxially provided at the center of the inner disc surface of the base disc; a spline shaft that slides and engages with the keyway sleeve is provided at the center of the inner disc surface of the opening / closing disc; the inner spring is sleeved on the keyway sleeve and its two ends are fixed between the inner disc surface of the base disc and the inner disc surface of the opening / closing disc; the damping washer is annular and coaxially fixed to the inner disc surface of the opening / closing disc, and the damping washer slides in axial contact with the inner disc surface of the base disc; when the valve disc rotates with the rocker arm toward the valve seat, the outer disc surface of the opening / closing disc can make closed contact with the end face of the valve seat.

[0009] Preferably, the opening and closing disc annular sidewall is provided with a side wing ring extending outward relative to the base disc annular sidewall.

[0010] Preferably, a plurality of guide grooves are evenly distributed around the central axis on the inner surface of the base plate. The guide grooves extend inward along the axial direction of the base plate. The damping washer is provided with a plurality of guide blocks that are inserted and slidably engaged with the plurality of guide grooves.

[0011] Preferably, the through hole of the packing pin on the valve body is a countersunk through hole, and the packing pin is provided with a stepped ring that contacts the countersunk end face of the countersunk through hole, and the collar packing is pressed between the stepped ring and the packing pressure ring.

[0012] Preferably, the ring packing is a circular packing structure woven from graphite braided packing.

[0013] Preferably, the valve seat has an annular contact washer fixed on the sealing end face, the outer end face of the contact washer has an annular protrusion, and the outer end face of the opening and closing disc has an annular groove. When the opening and closing disc is in sealing contact with the contact washer, the annular protrusion is embedded in the annular groove.

[0014] Preferably, a limit contact is provided on the inner wall of the installation channel, and a buffer block is fixed on the end of the rocker arm away from the rotatable connection. When the opening and closing disc is in a fully open state, the buffer block contacts the limit contact.

[0015] The above technical solution has the following advantages or beneficial effects: 1. The present invention provides an external pin high-pressure swing check valve, which improves the sealing design of the traditional valve body located at the pin position, greatly improves the assembly sealing performance at this position, improves the reliability of the seal, and avoids the problem of leakage and seal failure when high-pressure media flow.

[0016] 2. This invention provides an external pin high-pressure swing check valve, which improves the structure of the valve disc in the traditional valve body by optimizing the traditional integral structure of the valve disc into a multi-layer segmented structure. This effectively buffers, blocks, and reduces wear from impacts, avoiding valve disc cracking and sealing failure after long-term use, thus improving service life. In addition, it also reduces noise during impacts to a certain extent. Attached Figure Description

[0017] The invention, its features, shape, and advantages will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Like reference numerals denote like parts throughout the drawings, which are not intentionally drawn to scale; the focus is on illustrating the spirit of the invention.

[0018] Figure 1 This is a schematic diagram of the fully open state of an external pin high-pressure swing check valve provided by the present invention.

[0019] Figure 2 This is a schematic diagram of the fully closed state of an external pin high-pressure swing check valve provided by the present invention.

[0020] Figure 3 yes Figure 1 A magnified view of a portion of point A in the middle.

[0021] Figure 4 yes Figure 2 A magnified view of a portion of point B in the middle.

[0022] Figure 5 This is a partial schematic diagram of the assembly structure of the external pin assembly on the valve body.

[0023] Figure 6 This is a schematic diagram illustrating the state change from open to closed of a high-pressure swing check valve with an external pin, provided by the present invention.

[0024] Figure 7 This is a three-dimensional structural diagram of the valve disc.

[0025] Figure 8 This is a front view of the valve disc.

[0026] Figure 9 yes Figure 8 A sectional view of CC.

[0027] Figure 10 yes Figure 8 A sectional view of DD.

[0028] In the diagram: 1. Valve body; 11. Forward flow port; 12. Backward flow port; 13. Medium passage; 14. Installation passage; 141. Limiting contact block; 15. Valve cover; 151. Lifting eye bolt; 2. Swing check valve opening and closing element; 3. Valve seat; 31. Contact washer; 311. Circular protrusion; 4. Swing assembly; 41. External through pin assembly; 411. Packing pin; 4111. Stepped ring; 412. Collar packing; 413. Pin end cap; 4131. Packing pressure ring; 42. Rocker arm; 421. Buffer block; 5. Valve disc; 51. Base disc; 511. Keyway sleeve; 512. Guide groove; 52. Opening and closing disc; 521. Splined shaft; 522. Side wing ring; 523. Circular groove; 53. Internal connecting spring; 54. Damping washer; 541. Guide block. Detailed Implementation

[0029] The following detailed description of the embodiments, with reference to the accompanying drawings, aims to help those skilled in the art to have a more complete, accurate, and in-depth understanding of the concept and technical solutions of the present invention, and to facilitate its implementation, but is not intended to limit the present invention.

[0030] like Figure 1 , Figure 2 and Figure 6 As shown, an external pin high-pressure swing check valve includes a valve body 1. The valve body 1 includes a medium channel 13 that is linearly connected to a forward flow port 11 and a reverse flow port 12. An installation channel 14 is provided on the valve body 1 between the forward flow port 11 and the reverse flow port 12 and perpendicular to the medium channel 13. A valve cover 15 is fixedly installed at the top of the installation channel 14 by bolts, and a gasket is used to strengthen the seal between the valve cover 15 and the top of the installation channel 14. A lifting eye bolt 151 is threaded on the valve cover 15 to facilitate the lifting and transfer of the entire check valve. A swing check valve opening and closing element 2 for controlling the unidirectional flow of the medium in the medium channel 13 is installed inside the valve body 1.

[0031] like Figure 5 and Figure 6As shown, the swing check valve opening and closing component 2 includes a valve seat 3, a swing assembly 4, and a valve disc 5. The valve seat 3 is annular and is fixed to the medium channel 13 on the side of the mounting channel 14 near the downstream port 11 by bolts. Similarly, the valve seat 3 and the mounting contact surface inside the valve body 1 are reinforced with gaskets to enhance the sealing effect. The swing assembly 4 includes an external pin assembly 41 and a rocker arm 42. The external pin assembly 41 includes a packing pin 411 that extends horizontally from the outside into the mounting channel 14, a collar packing 412 that is sleeved on the packing pin 411 from one side of the outer shaft end, and a pin end cap 413 that is detachably fixed to the outer wall of the valve body 1 by bolts. The packing pin 411 is axially perpendicular to the medium channel 13 and is detachably fixed to the pin end cap 413 by bolts. On valve body 1, the through hole of the packing pin 411 is a countersunk through hole. The packing pin 411 is provided with a stepped ring 4111 that contacts the countersunk end face of the countersunk through hole. The pin end cap 413 is provided with a packing pressure ring 4131 that is sleeved on the packing pin 411 and presses against the collar packing 412. The collar packing 412 is pressed between the stepped ring 4111 and the packing pressure ring 4131. In this embodiment, the collar packing 412 is a circular packing structure woven from graphite braided packing. Graphite braided packing is an existing sealing filler material. The collar packing 412 can be a single ring structure or multiple ring structures connected in series. One end of the rocker arm 42 is rotatably mounted on the packing pin 411 through a rotating sleeve, and the valve disc 5 is fixed on the rocker arm 42. In this embodiment, after the packing pin 411 is locked onto the pin end cap 413, on the one hand, the stepped ring 4111 presses against the countersunk end face of the countersunk through hole, forming the first seal. On the other hand, the flexible mesh woven structure of the collar packing 412 is squeezed between the stepped ring 4111 and the packing pressure ring 4131, forming a great compression. The dense and compressed collar packing 412 can effectively seal the assembly gap and enhance the seal. Therefore, in this embodiment, through the enhanced sealing design of the external pin assembly 41, the problem of medium leakage caused by the seal failure at the pin assembly position of the packing pin 411 after long-term use and after experiencing high-pressure medium flow is avoided, which greatly improves the reliability of the local sealing.

[0032] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10As shown, the valve disc 5 includes a base disc 51, an opening / closing disc 52, an inner spring 53, and a damping washer 54. The base disc 51 is fixed to the rocker arm 42 by bolts. A keyway sleeve 511 is coaxially arranged at the center of the inner disc surface of the base disc 51. A spline shaft 521 that slides and engages with the keyway sleeve 511 is arranged at the center of the inner disc surface of the opening / closing disc 52. The inner spring 53 is sleeved on the keyway sleeve 511 and its two ends are fixed to the inner disc surface of the base disc 51 and the inner disc surface of the opening / closing disc 52 by bolts. Between the surfaces; the damping washer 54 is annular and made of rubber, and is coaxially fixed to the inner surface of the opening / closing disc 52, and slides in contact with the inner surface of the base disc 51 along the axial direction; eight guide grooves 512 are evenly distributed around the central axis on the end face of the inner surface of the base disc 51, and the guide grooves 512 extend inward along the axial direction of the base disc 51; the damping washer 54 is provided with eight guide blocks 541 that are inserted and slidably fitted into the eight guide grooves 512 one by one. The annular sidewall of the opening / closing disc 52 is provided with a side flange 522 that extends outward relative to the annular sidewall of the base disc 51. When the valve disc 5 rotates with the rocker arm 42 toward the valve seat 3, the end of the outer surface of the opening / closing disc 52 can make closed contact with the end face of the valve seat 3. A ring-shaped contact washer 31 is fixed on the sealing end face of the valve seat 3. A circular protrusion 311 is provided on the outer end face of the contact washer 31. A circular groove 523 is provided on the outer end face of the opening / closing disc 52. When the opening / closing disc 52 is in sealing contact with the contact washer 31, the circular protrusion 311 is embedded in the circular groove 523. When in the closed state, the embedded cooperation between the circular protrusion 311 and the circular groove 523 can enhance the sealing performance. A limit contact block 141 is provided on the inner side wall of the installation channel 14. A buffer block 421 is fixed on the end of the rocker arm 42 away from the rotary connection. When the opening / closing disc 52 is in the fully open state, the buffer block 421 contacts the limit contact block 141, thereby avoiding hard collision and improving the protection of the valve disc 5.

[0033] In this embodiment, the valve disc 5 has been optimized from a traditional independent integral structure into a double-layer segmented structure; the swing check valve itself is the active valve body 1, such as... Figure 1 As shown, when the medium flows from the downstream port 11 to the right and the medium pressure is sufficient, the valve disc 5 will be fully opened, and the medium passage 13 will be in the open state; as Figure 2 As shown, when there is no medium flowing in the medium channel 13, the valve disc 5 will actively move closer to the valve seat 3 due to its own gravity balance, and eventually the valve disc 5 will contact the valve seat 3, and the medium channel 13 will be in a closed state. When the medium flows to the left from the side of the reverse flow port 12, the pressure of the medium will further enhance the contact force between the valve disc 5 and the valve seat 3, and continue to maintain the closed state, thereby avoiding medium backflow. In the reverse flow state, the medium pressure can further enhance the sealing pressure between the opening and closing disc 52 and the contact gasket 31 by acting on the side flange 522.

[0034] However, when there is opposing flow of medium in the medium channel 13 on both sides of the valve disc 5, and the medium pressure on both sides is close to equilibrium and in a "tug-of-war" state, the valve disc 5 and the valve seat 3 are in a reciprocating striking state. In this embodiment, a double-fitting guide setting is adopted, which uses the guide sliding fit of the keyway sleeve 511 and the spline shaft 521 and the insertion sliding fit of the guide block 541 and the guide groove 512. This improves the stability of the assembly fit between the base plate 51 and the opening and closing plate 52. When the valve disc seat and the valve seat 3 are in a striking state, the inner spring 53 will provide a buffering force to the opening and closing plate 52, which will consume the striking impact force. The damping washer 54 can also consume the impact force. At the same time, the damping spring can block the impact force and prevent the impact force from being internally transmitted between the base plate 51 and the opening and closing plate 52. In addition, the contact washer 31 and the opening and closing plate 52 can also play a buffering role. Therefore, the structural design of the valve disc 5 of the present invention can effectively buffer, block and reduce wear from the reciprocating impact between it and the valve seat 3, avoiding the problems of cracking, damage and sealing failure of the valve disc 5 after long-term use, thus improving its service life. In addition, it also reduces the noise during impact to a certain extent.

[0035] Those skilled in the art should understand that variations can be implemented by combining existing technology and the above embodiments, and will not be elaborated here. Such variations do not affect the essence of the present invention, and will not be elaborated here.

[0036] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and the devices and structures not described in detail should be understood as being implemented in a manner common to the art; any possible variations and modifications made by those skilled in the art without departing from the technical solution of the present invention, or equivalent embodiments with equivalent changes, do not affect the essential content of the present invention. Therefore, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-pressure swing check valve with an external pin, comprising a valve body, the valve body including a medium channel linearly connected by a forward flow port and a reverse flow port, and an installation channel disposed on the valve body between the forward flow port and the reverse flow port and perpendicular to the medium channel; characterized in that: The valve body is equipped with a swing check valve for controlling the unidirectional flow of the medium within the medium channel; wherein: The swing check valve opening and closing device includes a valve seat, a swing assembly, and a valve disc. The valve seat is annular and fixed in the medium channel on one side of the installation channel near the downstream port. The swing assembly includes an external pin assembly and a rocker arm. The external pin assembly includes a packing pin that extends horizontally from the outside into the installation channel, a collar packing that is sleeved on the packing pin from one side of the outer shaft end, and a pin end cap that is detachably fixed to the outer wall of the valve body. The packing pin is axially perpendicular to the medium channel and is detachably fixed to the pin end cap. The pin end cap is provided with a packing pressure ring that is sleeved on the packing pin and presses against the collar packing. One end of the rocker arm is rotatably mounted on the packing pin, and the valve disc is fixed to the rocker arm. The valve disc includes a base plate, an opening / closing plate, an inner spring, and a damping washer. The base plate is fixed to the rocker arm. A keyway sleeve is coaxially provided at the center of the inner surface of the base plate. A splined shaft that slides and engages with the keyway sleeve is provided at the center of the inner surface of the opening / closing plate. The inner spring is sleeved on the keyway sleeve and its two ends are fixed between the inner surfaces of the base plate and the opening / closing plate. The damping washer is annular and made of rubber. The damping washer is coaxially fixed on the inner surface of the opening / closing plate and slides axially with the inner surface of the base plate. When the valve disc rotates with the rocker arm toward the valve seat, the outer surface of the opening / closing plate can make closed contact with the end face of the valve seat. Multiple guide grooves are evenly distributed around the central axis on the inner surface of the base plate. The guide grooves extend inward along the axial direction of the base plate. Multiple guide blocks are provided on the damping washer, which are inserted and slidably fitted into the guide grooves one by one.

2. A high-pressure swing check valve with an external pin according to claim 1, characterized in that: The opening and closing disc has a side wing ring that extends outward relative to the side wall of the base disc.

3. A high-pressure swing check valve with an external pin according to claim 1, characterized in that: The through hole of the packing pin on the valve body is a countersunk through hole. The packing pin is provided with a stepped ring that contacts the countersunk end face of the countersunk through hole. The collar packing is pressed between the stepped ring and the packing pressure ring.

4. A high-pressure swing check valve with an external pin according to claim 1, characterized in that: Ring packing is a circular packing structure woven from graphite braided packing.

5. A high-pressure swing check valve with an external pin according to claim 1, characterized in that: The valve seat has an annular contact washer fixed on the sealing end face. The outer end face of the contact washer has an annular protrusion. The outer end face of the opening and closing disc has an annular groove. When the opening and closing disc comes into sealing contact with the contact washer, the annular protrusion is embedded in the annular groove.

6. A high-pressure swing check valve with an external pin according to claim 1, characterized in that: Limiting contacts are installed on the inner wall of the installation channel, and a buffer block is fixed on the end of the rocker arm away from the rotary connection. When the opening and closing disc is fully open, the buffer block contacts the limiting contacts.

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