Axial flow check valve with position indication function

Abstract

The utility model relates to an axial flow check valve with a position indication function, which belongs to the field of valves and comprises a valve body, a valve clack and a valve seat, a buffer device is arranged between the outer circumference of the valve clack and a valve cavity, and when the medium pressure of an inlet channel disappears and the valve clack is closed to the position close to the valve seat, the outer conical surface of the valve clack is in contact with the inner conical surface of a radial telescopic block of the buffer device. The radial telescopic block is pushed to radially compress, the closing speed of the valve clack is reduced, and the impact force between the valve clack and the valve seat sealing surface is reduced; the valve clack position monitoring device is arranged between the guide rod and the valve body, the position state of the valve clack can be monitored in real time, the situation that system equipment is damaged due to the fact that the valve clack cannot be reliably closed due to faults of internal parts of the valve is prevented, and the reliability of pipeline system equipment protection is improved. The utility model has the advantages of low vibration and noise, reliable sealing performance, long service life, good use reliability and the like.

Description

Technical Field

[0001] This utility model belongs to the field of valves, and in particular relates to an axial flow check valve. Background Technology

[0002] Axial flow check valves are used in media conveying pipeline systems in petrochemical, power, water supply and drainage, and shipbuilding industries to prevent media backflow, avoid equipment damage and material leakage caused by backflow, and ensure the safe and stable operation of production equipment. The structure of an axial flow check valve includes a valve body, valve disc, and valve seat. The valve disc is installed between guide frames within the inlet and outlet channels of the valve body via guide rods. The valve body is installed in the media conveying pipeline via flanges at both ends. The inlet medium pressure pushes the valve disc away from the valve seat to open the valve, allowing the medium to flow axially from the annular flow channel between the outer circumference of the valve disc and the inner wall of the valve body to the outlet. When the inlet medium pressure disappears, the outlet medium pressure and spring force jointly push the valve disc to seal against the valve seat, closing the valve and preventing media backflow that could damage inlet equipment or cause leakage. It features a simple structure and reliable opening and closing. However, the main problems with existing axial flow check valves are: when closing, the reverse medium pressure and spring force push the valve disc to close quickly, causing a large impact between the valve disc and the valve seat, which can easily damage the sealing surfaces of the valve disc and the valve seat, and generate large vibrations and noise; the position and opening / closing status of the valve disc cannot be monitored in real time, and when an internal valve malfunction causes the valve disc to be unable to close flexibly, it can easily cause medium leakage and equipment damage. Utility Model Content

[0003] This utility model addresses the problems existing in the prior art by providing an axial flow check valve with a position indicator that has a buffer function when the valve disc is closed, can monitor the valve disc position in real time, has reliable sealing performance, long service life, low vibration and noise, and high operational reliability.

[0004] The technical solution of this utility model is as follows:

[0005] An axial flow check valve with position indication includes a valve body, a valve disc, and a valve seat. The valve body has an inlet channel and an outlet channel. A first guide frame and a second guide frame are respectively arranged in the inlet channel and the outlet channel. A valve cavity is formed between the inlet channel and the outlet channel. The valve seat is located at the connection between the inlet channel and the valve cavity. The valve disc is installed in the valve cavity between the first guide frame and the second guide frame via a guide rod. A sealing surface that mates with the valve seat is provided on one side of the valve disc's plane, and a spring is provided between the center of the other side of the plane and the second guide frame. The valve disc is characterized by a buffer device between its outer circumference and the valve cavity, and a valve disc position monitoring device between the guide rod and the valve body. The buffer device consists of a radial elastic telescopic device located in the valve cavity near the valve seat and a conical surface located on the outer circumference of the valve disc. The radial elastic telescopic device comprises a mounting platform, radial telescopic blocks, and telescopic springs. Several mounting platforms are evenly arranged circumferentially within the valve cavity near the valve seat. The inner side of each radial telescopic block has a conical surface that mates with the outer conical surface of the valve disc, and its outer side is movably fitted into the radial mounting holes of the mounting platform. The telescopic springs are installed between the outer end face of the radial telescopic blocks and the radial mounting holes. The valve disc position monitoring device comprises a position transmitting block, a position detection rod, and a position transmitter. One end of the position transmitting block is fixedly mounted on a guide rod, and the other end has an axial guide groove on its outer inclined surface. The position detection rod is dynamically sealed and mounted on the valve body, with one end touching the axial guide groove and the other end connected to the position transmitter. A return spring is provided between the position detection rod and the valve body.

[0006] In the above technical solution, the position transmitter adopts a magnetic sensor, which consists of a magnetic signal generator, a valve opening signal receiver, and a valve closing signal receiver. The magnetic signal generator is fixedly installed on the position detection rod, and the valve opening signal receiver and the valve closing signal receiver are fixedly installed on the valve body on one side of the magnetic signal generator.

[0007] In the above technical solution, a valve disc opening indicator is provided between the position detection rod and the valve body. The valve disc opening indicator consists of a pointer fixedly installed on the position detection rod and an opening scale fixedly installed on the valve body.

[0008] The advantages of this utility model compared with the prior art are:

[0009] 1. A buffer device is installed between the outer circumference of the valve disc and the valve cavity. When the medium pressure in the inlet channel disappears, the valve disc closes quickly under the combined thrust of the reverse medium pressure and the spring. When the valve disc closes to the position close to the valve seat, the outer conical surface of the valve disc contacts the inner conical surface of the radial telescopic block of the buffer device, pushing the radial telescopic block to compress radially, slowing down the closing speed of the valve disc, reducing the impact force between the valve disc and the valve seat sealing surface, reducing system vibration and noise, and improving sealing performance and product service life.

[0010] 2. A valve disc position monitoring device is installed between the guide rod and the valve body to monitor the valve disc position in real time, preventing damage to system equipment caused by unreliable valve disc closure due to internal valve component failure, and improving the reliability of pipeline system equipment protection. Attached Figure Description

[0011] Figure 1 This is a structural cross-sectional view of the present invention.

[0012] Figure 2 This is a utility model Figure 1 Enlarged view of a portion of the buffer device.

[0013] Figure 3 This is a utility model Figure 1 Enlarged view of a portion of the valve disc position monitoring device.

[0014] In the diagram: 1 Valve body, 2 Valve disc, 3 Guide rod, 4 Spring, 5 Outlet channel, 6 Second guide frame, 7 Valve cavity, 8 First guide frame, 9 Position sending block, 10 Inlet channel, 11 Radial telescopic block, 12 Mounting platform, 13 Telescopic spring, 14 Position detection rod, 15 Return spring, 16 Pointer, 17 Opening scale, 18 Magnetic signal generator, 19 Valve closing signal receiver, 20 Valve opening signal receiver, 21 Axial guide groove. Detailed Implementation

[0015] like Figure 1The axial flow check valve with position indicator shown includes a valve body 1, a valve disc 2, and a valve seat. The valve body 1 has an inlet channel 10 and an outlet channel 5. A first guide frame 8 is installed in the inlet channel 10, and a second guide frame 6 is installed in the outlet channel 5. A valve cavity 7 is located between the inlet channel 10 and the outlet channel 5. The inlet channel 10 and the outlet channel 5 are concentric and have the same diameter. Fluid flows from the inlet channel 10 through the flow windows of the first guide frame 8 and the second guide frame 6 and exits from the outlet channel 5, forming an axial flow structure. The valve seat is located at the connection between the inlet channel 10 and the valve cavity 7. The valve disc 2 is installed in the valve cavity 7 between the first guide frame 8 and the second guide frame 6 via a guide rod 3. One side of the valve disc 2 has a sealing surface that cooperates with the valve seat, and the center of the other side is provided with a spring 4 between the valve disc 2 and the second guide frame 6. The positive medium pressure pushes the valve disc 2 open by overcoming the elastic force of the spring 4 through the inlet channel 10. The reverse medium pressure and the elastic force of the spring 4 push the valve disc 2 open. The valve disc 2 is closed to prevent backflow of the medium and damage to the system equipment. Its features include: a buffer device is installed between the valve disc 2 and the valve cavity 7, and a valve disc position monitoring device is installed between the guide rod 3 and the valve body 1. The buffer device consists of a radial elastic telescopic device located in the valve cavity 7 near the valve seat, which cooperates with a conical surface on the outer circumference of the valve disc 2. The radial elastic telescopic device consists of a mounting platform 12, a radial telescopic block 11, and a telescopic spring 13. Several mounting platforms 12 are evenly arranged circumferentially within the valve cavity 7 near the valve seat. The inner side of the radial telescopic block 11 has a conical surface that cooperates with the outer conical surface of the valve disc 2, and its outer side is movably fitted into the radial mounting hole of the mounting platform 12. The telescopic spring 13 is installed between the outer end face of the radial telescopic block 11 and the bottom surface of the radial mounting hole, pushing the radial telescopic block 11 towards the center of the valve cavity 7. The radial telescopic block 11 and the inner wall of the radial mounting hole of the mounting platform 12 form a piston-like structure. Figure 2 As shown, the mounting platform 12 can be configured with an annular step on the inner wall of the valve cavity 7, with radial mounting holes evenly arranged in the circumferential direction of the inner annular surface of the annular step, or with an annular mounting groove on the inner annular surface of the annular step. The radial telescopic block 11 can be a four-ring design, embedded in the annular mounting groove. The valve disc position monitoring device consists of a position transmitting block 9, a position detection rod 14, and a position transmitter. One end of the position transmitting block 9 is fixedly mounted on the guide rod 3, and the other end has an axial guide groove 21 on its outer inclined surface. The position detection rod 14 is dynamically sealed and mounted on the valve body 1, with one end abutting in the axial guide groove 21 and the other end connected to the position transmitter. A return spring 15 is provided between the position detection rod 14 and the valve body 1. The axial guide groove 21 has the same slope as the outer inclined surface of the position transmitting block 9, and the position detection rod 14 contacts the bottom of the axial guide groove 21. Figure 3As shown, when valve disc 2 is in the closed state, return spring 15 pushes position detection rod 14 to move into the inner cavity of valve body 1 and sends a valve closing signal. When valve disc 2 is in the open state, position sending block 9 pushes position detection rod 14 to move radially outward of valve body 1 channel and sends a valve opening signal.

[0016] The position transmitter uses a magnetic sensor, which consists of a magnetic signal generator 18, a valve opening signal receiver 20, and a valve closing signal receiver 19. The magnetic signal generator 18 is fixedly mounted on the position detection rod 14, and the valve opening signal receiver 20 and the valve closing signal receiver 19 are fixedly mounted on the valve body 1 on one side of the magnetic signal generator 18. Figure 3 As shown, when valve disc 2 is in the closed state, the magnetic signal generator 18 is aligned with the valve closing signal receiver 19, causing the valve closing signal receiver 19 to send a valve closing position signal. When valve disc 2 is in the open state, the magnetic signal generator 18 is aligned with the valve opening signal receiver 20, causing the valve opening signal receiver 20 to send a valve opening position signal.

[0017] A valve disc opening indicator is provided between the position detection rod 14 and the valve body 1. The valve disc opening indicator consists of a pointer 16 fixedly installed on the position detection rod 14 and an opening scale 17 fixedly installed on the valve body 1. The pointer 16 corresponds to the opening degree on the opening scale 17 at different positions of the position detection rod 14 in the axial guide groove 21.

Claims

1. An axial flow check valve with position indication, comprising a valve body (1), a valve disc (2), and a valve seat, wherein the valve body (1) has an inlet channel (10) and an outlet channel (5), a first guide frame (8) is provided in the inlet channel (10), a second guide frame (6) is provided in the outlet channel (5), a valve cavity (7) is provided between the inlet channel (10) and the outlet channel (5), the valve seat is provided at the connection between the inlet channel (10) and the valve cavity (7), the valve disc (2) is installed in the valve cavity (7) between the first guide frame (8) and the second guide frame (6) by a guide rod (3), a sealing surface that cooperates with the valve seat is provided on one side of the plane of the valve disc (2), and a spring (4) is provided between the center of the other side of the plane and the second guide frame (6); characterized in that: A buffer device is provided between the valve disc (2) and the valve cavity (7), and a valve disc position monitoring device is provided between the guide rod (3) and the valve body (1). The buffer device is composed of a radial elastic telescopic device provided in the valve cavity (7) near the valve seat and a conical surface provided on the outer circumference of the valve disc (2) that cooperates with each other. The radial elastic telescopic device is composed of a mounting platform (12), a radial telescopic block (11), and a telescopic spring (13). The mounting platform (12) is located in the valve cavity (7) near the valve seat, and several are evenly arranged in the circumferential direction. The radial telescopic block (11) has a conical surface on the inner side that cooperates with the outer conical surface of the valve disc (2), and the outer side is movably embedded. The telescopic spring (13) is installed in the radial mounting hole of the mounting platform (12) between the outer end face of the radial telescopic block (11) and the bottom surface of the radial mounting hole; the valve disc position monitoring device consists of a position sending block (9), a position detection rod (14) and a position transmitter. One end of the position sending block (9) is fixedly installed on the guide rod (3), and the other end has an axial guide groove (21) on its outer inclined surface. The position detection rod (14) is dynamically sealed and installed on the valve body (1). One end of the rod is mounted on the axial guide groove (21), and the other end is connected to the position transmitter. A return spring (15) is set between the position detection rod (14) and the valve body (1).

2. The axial flow check valve with position indication according to claim 1, characterized in that: The position transmitter uses a magnetic sensor, which consists of a magnetic signal generator (18), a valve opening signal receiver (20), and a valve closing signal receiver (19). The magnetic signal generator (18) is fixedly installed on the position detection rod (14), and the valve opening signal receiver (20) and the valve closing signal receiver (19) are fixedly installed on the valve body (1) on one side of the magnetic signal generator (18).

3. The axial flow check valve with position indication according to claim 2, characterized in that: in A valve disc opening indicator is provided between the position detection rod (14) and the valve body (1). The valve disc opening indicator consists of a pointer (16) fixedly installed on the position detection rod (14) and an opening scale (17) fixedly installed on the valve body (1).

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