Safety valve and valve safety early warning system

Abstract

The invention discloses a safety valve and a valve safety early warning system, and belongs to the technical field of valve intelligent control systems.The safety valve comprises a sealing assembly, a length measuring assembly, a pressure measuring assembly, a force unloading assembly and a data processing unit. Therefore, the situation that the first spring fails due to the fact that the first spring is kept in an over-compression state for a long time under the condition that the fluid pressure is too large is avoided, and meanwhile early warning can be sent to a user at the first time so as to ensure the working safety of the valve and a pipeline.

Description

Technical Field

[0001] The invention discloses a safety valve and a valve safety early warning system, belonging to the technical field of valve intelligent control systems. Background Art

[0002] Safety valves are special valves whose opening and closing parts are in a normally closed state under the action of external forces. When the medium pressure in the equipment or pipeline exceeds the specified value, the medium is discharged to the outside of the system to prevent the medium pressure in the pipeline or equipment from exceeding the specified value. Safety valves belong to automatic valves and are mainly used in pressure vessels and pipelines to control the safety pressure of the corresponding containers not to exceed the specified value, which plays an important protective role in personal safety and equipment operation. In the process of opening the existing safety valve, when the pressure at the inflow end of the pipeline fluid is greater, the movement distance of the valve core after opening is greater, and the compressed length of the spring acting on the valve core becomes greater. In order to avoid spring failure and ensure the safety and reliability of the valve operation, the overall compression length ratio of the spring should be controlled within a reasonable range. Therefore, it is necessary to detect the compression state of the spring in real time, and unload the spring under overpressure, and issue an early warning at the same time. However, there is no such technology disclosed in safety valves at present. Summary of the invention

[0003] The purpose of the present invention is to solve the problems in the prior art and to provide a safety valve and a valve safety early warning system.

[0004] The present invention achieves the above-mentioned purpose through the following technical solutions, a safety valve and a valve safety early warning system, comprising: A sealing assembly, which is used to control the flow state of the fluid in the safety valve, the sealing assembly comprises a valve core and a first spring, the first spring applies a force to the valve core to close the safety valve, and the original length of the first spring is L1; A length measuring component, which is used to measure in real time the final length L2 of the first spring after compression; A pressure measuring component, which is used to measure the pressure P1 at the fluid inlet end and the pressure P2 at the fluid outlet end in real time; A force unloading assembly, which is used to unload the force of the first spring, the force unloading assembly includes an air supply system, a pressure chamber, a piston and a second spring, the piston is slidably arranged in the pressure chamber, the air supply system and the second spring exert opposite forces on the piston, a fixing ring for adjusting the moving distance of the valve core is fixedly installed on the piston, and the air supply system reduces the moving distance of the valve core after passing gas into the pressure chamber to increase the pressure; A data processing unit is coupled with the length measuring unit, the pressure measuring unit and the air supply system. The data processing unit is used to receive the values ​​of L1, L2, P1 and P2, and to calculate and judge the values. The specific method is: when (L1-L2) / L1>0.4, the data processing unit sends an electrical signal to control the air supply system to pass gas pressurization into the pressure chamber until (L1-L2) / L1≤0.4, and calculates the pressure difference △P=P1-P2. If △P is greater than the set pressure value, a warning signal is sent to the user.

[0005] Preferably, the length measuring assembly comprises an infrared transmitter and an infrared receiver, and the infrared transmitter and the infrared receiver are located at two ends of the first spring and keep moving synchronously when the first spring is compressed.

[0006] Preferably, the pressure measurement assembly includes a first pressure sensor and a second pressure sensor.

[0007] A safety valve comprises a valve safety detection system, and further comprises a lower valve body and an upper valve body, wherein a valve seat is fixedly installed in the lower valve body, the valve seat is coaxially arranged with a valve core, the upper valve body and the lower valve body are fixedly connected by bolts, the measuring end of the first pressure sensor extends into the valve seat to measure the pressure P1 at the fluid inflow end, the measuring end of the second pressure sensor extends into the lower valve body to measure the pressure P2 at the fluid outflow end, an installation cavity is arranged in the upper valve body, the valve core comprises a valve stem and a sealing sleeve, the valve stem is slidably arranged with the upper valve body, and one end of the valve stem is in contact with the sealing sleeve, one end of the sealing sleeve is slidably arranged in a fixed ring, the first spring is located in the installation cavity, and both ends of the first spring are A pressure block is provided, and the valve stem passes through two pressure blocks. The infrared transmitter and the infrared receiver are respectively installed on the two pressure blocks. The pressure chamber is annular in structure and is located in the upper valve body. A pressure cover for sealing the pressure chamber is provided on the upper valve body. The piston is slidably arranged in the pressure chamber, and a plurality of push rods distributed in an array are provided on the piston. The push rods pass through the upper valve body and are fixedly connected to the fixing ring by bolts. The air supply system includes an air pump, an air intake valve, an air intake nozzle, an exhaust nozzle and an exhaust valve. The air intake nozzle and the exhaust nozzle are both installed on the pressure cover. The air intake valve is connected to the air pump and the air intake nozzle through a pipeline, and the exhaust valve is connected to the air intake nozzle through a pipeline. The second spring sleeve is arranged on the outside of the push rod.

[0008] Preferably, limiting columns are provided on both sides of the piston, a gasket and a first sealing ring are provided at the connection between the push rod and the upper valve body, the gasket is located between the second spring and the first sealing ring, and a second sealing ring is provided between the upper valve body and the lower valve body.

[0009] Preferably, an adjustment component for adjusting the elastic force of the first spring is provided on the upper valve body, and the adjustment component includes a limit sleeve and a screw, the limit sleeve is threadedly connected to the upper valve body, the screw is located in the limit sleeve and threadedly connected to the limit sleeve, and the pressure block located at the upper end contacts the screw.

[0010] Preferably, a threading hole is provided in the valve stem, and an alarm is provided on the limit sleeve.

[0011] Compared with the prior art, the present invention has the following beneficial effects: By setting up a length measuring component and a pressure measuring component, the two components respectively measure the final length of the first spring after compression and the pressure at the fluid inlet end and the pressure at the outflow end, and rely on the data processing unit to perform data calculation, thereby controlling the unloading component to unload the first spring so that its length compression ratio is less than or equal to 0.4, and at the same time combining the pressure difference between the fluid inlet end and the fluid outflow end to issue an early warning, thereby ensuring the safety and reliability of the safety valve and the pipeline during operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 A control principle diagram of a valve safety early warning system of the present invention; Figure 2 It is a structural schematic diagram of a safety valve of the present invention; Figure 3 A cross-sectional view of a safety valve of the present invention; Figure 4 for Figure 3 A partial enlarged view of the middle A; Figure 5 It is a schematic diagram of the structure of the piston, the push rod and the fixing ring in the present invention; Figure 6 It is a structural schematic diagram of the upper valve body in the present invention; Figure numerals: 1. lower valve body; 2. pressure cover; 3. air inlet nozzle; 4. alarm; 5. exhaust nozzle; 6. upper valve body; 7. second pressure sensor; 8. first pressure sensor; 9. valve seat; 10. sealing sleeve; 11. piston; 12. first spring; 13. screw; 14. limiting sleeve; 15. valve stem; 16. fixing ring; 17. pressure block; 18. infrared transmitter; 19. threading hole; 20. pressure chamber; 21. second spring; 22. push rod; 23. gasket; 24. first sealing ring; 25. limiting column; 26. installation chamber; 27. infrared receiver. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0014] like Figure 1-Figure 6 As shown, a valve safety early warning system comprises: A sealing assembly, which is used to control the flow state of the fluid in the safety valve, the sealing assembly includes a valve core and a first spring 12, the first spring 12 applies a force to the valve core to close the safety valve, and the original length of the first spring 12 is L1; A length measuring assembly, which is used to measure in real time the final length L2 of the first spring 12 after compression. The length measuring assembly includes an infrared transmitter 18 and an infrared receiver 27. The infrared transmitter 18 and the infrared receiver 27 are located at both ends of the first spring 12 and keep moving synchronously when the first spring 12 is compressed. A pressure measuring assembly, which is used to measure in real time the pressure P1 at the fluid inflow end and the pressure P2 at the fluid outflow end, and the pressure measuring assembly includes a first pressure sensor 8 and a second pressure sensor 7; A force unloading assembly is used to unload the first spring 12. The force unloading assembly includes an air supply system, a pressure chamber 20, a piston 11, and a second spring 21. The piston 11 is slidably arranged in the pressure chamber 20. The air supply system and the second spring 21 exert opposite forces on the piston 11. A fixing ring 16 for adjusting the moving distance of the valve core is fixedly installed on the piston 11. After the air supply system passes gas into the pressure chamber 20 to increase pressure, the moving distance of the valve core will be reduced. The data processing unit is coupled with the length measuring unit, the pressure measuring unit and the air supply system. The data processing unit is used to receive the values ​​of L1, L2, P1 and P2, and calculate and judge the values. The specific method is: when (L1-L2) / L1>0.4, the data processing unit sends an electrical signal to control the air supply system to pass gas pressurization into the pressure chamber 20 until (L1-L2) / L1≤0.4, and calculates the pressure difference △P=P1-P2. If △P is greater than the set pressure value, a warning signal is sent to the user.

[0015] A safety valve includes a valve safety detection system, and also includes a lower valve body 1 and an upper valve body 6. A valve seat 9 is fixedly installed in the lower valve body 1, and the valve seat 9 is coaxially arranged with the valve core. The upper valve body 6 and the lower valve body 1 are fixedly connected by bolts. The measuring end of the first pressure sensor 8 extends into the valve seat 9 to measure the pressure P1 at the fluid inlet end, and the measuring end of the second pressure sensor 7 extends into the lower valve body 1 to measure the pressure P2 at the fluid outlet end. An installation cavity 26 is arranged in the upper valve body 6. The valve core includes a valve stem 15 and a sealing sleeve 10. The valve stem 15 is slidably arranged with the upper valve body 6, and one end of the valve stem 15 is in contact with the sealing sleeve 10. One end of the sealing sleeve 10 is slidably arranged in the fixing ring 16. The first spring 12 is located in the installation cavity 26, and both ends of the first spring 12 are provided with A pressure block 17, a valve stem 15 is provided through two pressure blocks 17, an infrared transmitter 18 and an infrared receiver 27 are respectively installed on the two pressure blocks 17, a pressure chamber 20 is annular in structure, and is located in the upper valve body 6, a pressure cover 2 for sealing the pressure chamber 20 is provided on the upper valve body 6, a piston 11 is slidably arranged in the pressure chamber 20, and a plurality of push rods 22 distributed in an array are provided on the piston 11, the push rod 22 passes through the upper valve body 6 and is fixedly connected with the fixing ring 16 by bolts, the air supply system comprises an air pump, an air intake valve, an air intake nozzle 3, an exhaust nozzle 5 and an exhaust valve, the air intake nozzle 3 and the exhaust nozzle 5 are both installed on the pressure cover 2, the air intake valve is connected to the air pump and the air intake nozzle 3 through a pipeline, the exhaust valve is connected to the air intake nozzle 3 through a pipeline, and a second spring 21 is sleeved on the outside of the push rod 22.

[0016] Limiting columns 25 are provided on both sides of the piston 11, and a gasket 23 and a first sealing ring 24 are provided at the connection between the push rod 22 and the upper valve body 6. The gasket 23 is located between the second spring 21 and the first sealing ring 24, and a second sealing ring is provided between the upper valve body 6 and the lower valve body 1. The limiting columns 25 can limit the moving distance of the piston 11, which can not only ensure that the gas can smoothly enter the pressure chamber 20 to achieve the pressurization effect, but also avoid the second spring 21 from being over-compressed. The force exerted by the second spring 21 on the gasket 23 is transmitted to the first sealing ring 24, which can cause the first sealing ring 24 to deform and seal the connection between the push rod 22 and the upper valve body 6.

[0017] An adjusting component for adjusting the elastic force of the first spring 12 is provided on the upper valve body 6, and the adjusting component includes a limit sleeve 14 and a screw 13. The limit sleeve 14 is threadedly connected to the upper valve body 6, and the screw 13 is located in the limit sleeve 14 and threadedly connected to the limit sleeve 14. The pressure block 17 located at the upper end is in contact with the screw 13. The position of the upper end pressure block 17 can be changed by rotating the screw 13, so that the elastic force of the first spring 12 can be adjusted, so that the valve core can be suitable for the opening pressure of a larger fluid, and the operation is simple and convenient.

[0018] A threading hole 19 is provided in the valve stem 15, and the threading hole 19 can be conveniently connected to the infrared transmitter 18 and the infrared receiver 27 with a wire. An alarm 4 is provided on the limit sleeve 14, and the alarm 4 is coupled to the data processing unit, which can make a real-time alarm and inform the user in time, or use wireless communication to make a remote warning.

[0019] Working principle: When the safety valve is closed, the initial compressed length of the first spring 12 remains unchanged. As the pressure P1 at the fluid inflow end in the valve seat 9 increases, when it reaches the point where it overcomes the elastic force of the first spring 12, the sealing sleeve 10 can move, and the safety valve opens. The opening amplitude of the safety valve depends on the value of the pressure P1 at the fluid inflow end. The larger the P1, the greater the compression of the first spring 12. At this time, the infrared transmitter 18 and the infrared receiver 27 are required to measure the final length L2 of the first spring 12 in real time. The measurement principle is to perform relevant calculations based on the time of signal reception. Once the first spring 12 appears (L1-L2) / L1>0.4, it means that the first spring 12 is in an over-compressed state. At this time, it is necessary to The unloading component immediately unloads the first spring 12. The specific unloading process is that the data processing unit controls the air pump to work, and gas is introduced into the pressure chamber 20 to achieve pressurization. The piston 11 is pushed by the air pressure to move, so that the second spring 21 is compressed. At the same time, the push rod 22 pushes the fixed ring 16 and the sealing sleeve 10 to move in the opposite direction of the force exerted by the fluid on the sealing sleeve 10. In this way, the length of the first spring 12 increases, thereby achieving the unloading effect, until (L1-L2) / L1≤0.4, and the pressure difference △P=P1-P2 is calculated at the same time. If △P is greater than the set pressure value, an early warning signal is issued to the user, allowing the user to make adjustments in time to ensure the safety of the safety valve and pipeline operation. △P can be set according to the actual usage scenario.

[0020] In this embodiment, when the exhaust valve discharges the gas in the pressure chamber 20, the piston 11 and the fixing ring 16 are reset under the action of the second spring 21. In addition, when the air pressure in the pressure chamber 20 reaches a certain value, the piston 11 can drive the fixing ring 16 to press the sealing sleeve 10 against the valve seat 9, so that the safety valve is closed. In this way, the safety valve loses the effect of fixed pressure relief and becomes a valve that needs to be opened manually, so that the dual purpose can be achieved.

[0021] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0022] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A valve safety early warning system, characterized in that: include: A sealing assembly, which is used to control the flow state of a fluid in a safety valve, the sealing assembly comprising a valve core and a first spring (12), the first spring (12) exerting a force on the valve core to close the safety valve, and the original length of the first spring (12) is L1; A length measuring assembly, used for measuring in real time the final length L2 of the first spring (12) after compression; A pressure measuring component, which is used to measure the pressure P1 at the fluid inlet end and the pressure P2 at the fluid outlet end in real time; A force unloading assembly, used for unloading the force of a first spring (12), the force unloading assembly comprising an air supply system, a pressure chamber (20), a piston (11) and a second spring (21), the piston (11) being slidably arranged in the pressure chamber (20), the air supply system and the second spring (21) exerting forces on the piston (11) in opposite directions, a fixing ring (16) for adjusting the moving distance of the valve core being fixedly mounted on the piston (11), and the moving distance of the valve core being reduced after the air supply system passes gas into the pressure chamber (20) to increase the pressure; A data processing unit is coupled to the length measuring unit, the pressure measuring unit and the gas supply system. The data processing unit is used to receive the values ​​of L1, L2, P1 and P2, and to calculate and judge the values. The specific method is as follows: when (L1-L2) / L1>0.4, the data processing unit sends an electrical signal to control the gas supply system to pass gas to the pressure chamber (20) for pressurization until (L1-L2) / L1≤0.4, and calculates the pressure difference △P=P1-P2. If △P is greater than the set pressure value, a warning signal is sent to the user.

2. A valve safety early warning system according to claim 1, characterized in that: The length measurement component comprises an infrared transmitter (18) and an infrared receiver (27), wherein the infrared transmitter (18) and the infrared receiver (27) are located at two ends of the first spring (12) and keep moving synchronously when the first spring (12) is compressed.

3. A valve safety early warning system according to claim 2, characterized in that: The pressure measurement assembly comprises a first pressure sensor (8) and a second pressure sensor (7).

4. A safety valve, characterized in that: The valve safety detection system according to claim 3 further comprises a lower valve body (1) and an upper valve body (6), wherein a valve seat (9) is fixedly installed in the lower valve body (1), and the valve seat (9) is coaxially arranged with the valve core, the upper valve body (6) and the lower valve body (1) are fixedly connected by bolts, the measuring end of the first pressure sensor (8) extends into the valve seat (9) to measure the pressure P1 at the fluid inflow end, the measuring end of the second pressure sensor (7) extends into the lower valve body (1) to measure the pressure P2 at the fluid outflow end, the upper valve body (6) is provided with an installation cavity (26), the valve core comprises a valve stem (15) and a sealing sleeve (10), the valve stem (15) is slidably arranged with the upper valve body (6), and one end of the valve stem (15) is in contact with the sealing sleeve (10), and one end of the sealing sleeve (10) is slidably arranged in the fixing ring (16), the first spring (12) is located in the installation cavity (26), and both ends of the first spring (12) are provided with a pressure-receiving member. The valve stem (15) is provided through two pressure blocks (17), the infrared transmitter (18) and the infrared receiver (27) are respectively mounted on the two pressure blocks (17), the pressure chamber (20) is annular in structure and is located in the upper valve body (6), the upper valve body (6) is provided with a gland (2) for sealing the pressure chamber (20), the piston (11) is slidably arranged in the pressure chamber (20), and the piston (11) is provided with a plurality of pushers distributed in an array. The push rod (22) passes through the upper valve body (6) and is fixedly connected to the fixing ring (16) by bolts. The air supply system comprises an air pump, an air intake valve, an air intake nozzle (3), an exhaust nozzle (5) and an exhaust valve. The air intake nozzle (3) and the exhaust nozzle (5) are both mounted on the gland (2). The air intake valve is connected to the air pump and the air intake nozzle (3) by a pipeline. The exhaust valve is connected to the air intake nozzle (3) by a pipeline. The second spring (21) is sleeved on the outside of the push rod (22).

5. A safety valve according to claim 4, characterized in that: Limiting columns (25) are provided on both sides of the piston (11); a gasket (23) and a first sealing ring (24) are provided at the connection between the push rod (22) and the upper valve body (6); the gasket (23) is located between the second spring (21) and the first sealing ring (24); and a second sealing ring is provided between the upper valve body (6) and the lower valve body (1).

6. A safety valve according to claim 4, characterized in that: The upper valve body (6) is provided with an adjustment component for adjusting the elastic force of the first spring (12), the adjustment component comprising a limit sleeve (14) and a screw rod (13), the limit sleeve (14) being threadedly connected to the upper valve body (6), the screw rod (13) being located inside the limit sleeve (14) and threadedly connected to the limit sleeve (14), and the pressure block (17) located at the upper end abuts against the screw rod (13).

7. A safety valve according to claim 4, characterized in that: A threading hole (19) is provided in the valve stem (15), and an alarm (4) is provided on the limit sleeve (14).

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