Safety valve capable of measuring opening pressure value in real time and adjusting method

Abstract

The safety valve capable of measuring the opening pressure value in real time mainly comprises a valve body, a valve element and a valve rod, and is characterized in that a limiting ring is arranged on the lower portion of the valve rod, the portion, above the limiting ring, of the valve rod is sequentially sleeved with a lower spring seat, a spring and an upper spring seat from bottom to top, and the upper portion of the valve rod freely penetrates through a center hole of an adjusting bolt and extends out of the valve body; the adjusting bolt is in threaded connection with the valve body and the lower end props against the upper spring seat; a thin film type pressure measuring sensor is installed in the upper spring seat and used for monitoring spring force in real time. According to the safety valve capable of measuring the opening pressure value in real time and the adjusting method, the opening setting pressure value of the safety valve can be monitored in real time, and after the spring deforms, the setting pressure value of the safety valve can be recovered and adjusted in time on site.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of safety valves, in particular to a safety valve capable of measuring opening pressure value in real time and a regulating method. BACKGROUND

[0002] A safety valve is a valve that is normally closed under the action of spring force and is used in water supply pipeline safety valves, air compressors, compressed air tanks, and pressure oil tanks in hydropower stations. When the pressure of the medium in the equipment or pressure vessel exceeds the specified value, the safety valve releases the medium (such as gas or liquid) to the system outside to prevent the pressure from exceeding the specified value, thereby preventing equipment damage, accidents, and even explosions.

[0003] The set pressure of a safety valve refers to the opening pressure value set during operation. When the pressure in the system reaches this set value, the safety valve will automatically open to release excess medium (such as gas or liquid), thereby preventing the system pressure from being too high and avoiding equipment damage, accidents, and even explosions.

[0004] In the prior art, the safety valve cannot display the set opening pressure value at all times. In harsh environments or after the safety valve operates, the spring is easily subjected to linear deformation, the set value changes, and the set pressure value of the safety valve cannot be monitored in real time, so the set pressure value of the safety valve cannot be accurately restored on site. SUMMARY

[0005] The technical problem to be solved by the present application is to provide a safety valve capable of measuring opening pressure value in real time and a regulating method, which can monitor the opening set pressure value of the safety valve in real time and restore and adjust the set pressure value of the safety valve on site in a timely manner after the spring deforms.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows: A safety valve capable of measuring opening pressure value in real time, comprising a valve body, a valve core, and a valve rod, wherein a limiting ring is arranged at the lower part of the valve rod, a lower spring seat, a spring, and an upper spring seat are sequentially arranged on the valve rod from bottom to top above the limiting ring, and the upper part of the valve rod freely passes through the center hole of an adjusting bolt and extends out of the valve body; the adjusting bolt is threadedly connected with the valve body and has a lower end abutting on the upper spring seat; a thin-film pressure measurement sensor is installed in the upper spring seat, and the thin-film pressure measurement sensor is used for monitoring the spring force in real time.

[0007] One side of the thin-film pressure measurement sensor is electrically connected with a pressure display device, and the pressure display device is located outside the valve body.

[0008] The upper spring seat comprises an upper seat plate and a lower seat plate, and the thin-film pressure measurement sensor is arranged between the upper seat plate and the lower seat plate.

[0009] The upper seat plate and the lower seat plate are freely folded together.

[0010] The locking nut is arranged on the upper end of the valve body.

[0011] The positioning ring groove is arranged on the upper seat plate, and the lower end of the adjusting screw is arranged in the positioning ring groove.

[0012] The upper seat plate and the lower seat plate are made of cast iron.

[0013] The mounting pipe is sealingly connected to the through hole of the valve body, and the pressure display device is fixed to the outer end of the mounting pipe.

[0014] The pressure display device is connected to the thin-film pressure measurement sensor through a signal line.

[0015] A method for adjusting a safety valve capable of measuring the opening pressure value in real time, when the set opening pressure value is F0, the spring force F1=F0 when the spring is not deformed, and when the pressure in the system reaches the set value, the safety valve will overcome the spring force to open the safety valve; When the set opening pressure value is F0, the spring force F2<F0 after the spring is deformed, at this time, the monitored data is inconsistent with the set value, if not adjusted, the safety valve will be opened when the pressure in the system has not reached the set value, resulting in medium loss and waste; by rotating the adjusting screw, the spring force is increased, and the spring force F2=F0; When the set opening pressure value is F0, the spring force F3>F0 after the spring is deformed, at this time, the monitored data is inconsistent with the set value, if not adjusted, the safety valve will not be opened when the pressure in the system reaches the set value, which will exist a safety hazard; by rotating the adjusting screw, the spring force is reduced, and the spring force F3=F0.

[0016] The present application provides a safety valve capable of measuring the opening pressure value in real time, which has the following technical effects: 1) By detecting the spring force of the safety valve, the opening pressure (set pressure) of the safety valve is monitored and displayed in real time, which prevents the safety valve from being opened by mistake after the opening pressure changes due to the deformation of the spring; or avoids the actual opening pressure value of the safety valve being too high, which causes the equipment, pressure vessel and pipeline to work under high pressure, thereby avoiding accidents. After the safety valve acts, the safety valve can be adjusted to the design set pressure value at any time, without the need to replace the new spring or safety valve, thereby improving the reuse rate.

[0017] Although existing devices can adjust the set pressure (such as CN201521013611 - a set pressure adjustment device for a spring safety valve, CN202422036172 - a safety valve with graded set pressure adjustment), these devices do not monitor the spring pressure in real time. When the spring deforms and the opening pressure changes, they cannot identify and adjust it in time. This method can monitor the spring pressure in real time, and thus can detect the change in opening pressure caused by the deformation of the spring in time, and then make rapid adjustments.

[0018] 2) Traditional safety valves require laboratory adjustment of the set pressure opening value, while this safety valve can be adjusted on-site according to the pressure display device. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the present invention.

[0020] In the diagram: valve body 1, valve core 2, valve stem 3, limit ring 4, lower spring seat 5, spring 6, upper spring seat 7, upper seat plate 7.1, lower seat plate 7.2, adjusting bolt 8, locking nut 9, diaphragm pressure sensor 10, through hole 11, pressure display device 12, signal line 13. Detailed Implementation

[0021] like Figure 1 As shown, a safety valve capable of real-time measurement of opening pressure includes a valve body 1. A valve core 2 is located at the opening / closing port within the valve body 1, and the valve core 2 is fixedly connected to a valve stem 3. A limiting ring 4 is located at the lower part of the valve stem 3. Above the limiting ring 4, a lower spring seat 5, a spring 6, and an upper spring seat 7 are sequentially fitted onto the valve stem 3 from bottom to top. The upper part of the valve stem 3 freely passes through the center hole of an adjusting bolt 8 and extends out of the valve body 1. The outer wall of the adjusting bolt 8 is threadedly connected to a threaded hole at the upper part of the valve body 1. During downward movement, the adjusting bolt 8 can push the upper spring seat 7 to move downwards synchronously. A locking nut 9 is threadedly connected to the adjusting bolt 8 on the outer side of the upper end of the valve body 1, further locking the position of the adjusting bolt 8.

[0022] The upper spring seat 7 includes an upper seat plate 7.1 and a lower seat plate 7.2. A thin-film pressure measuring sensor 10 is sandwiched between the upper seat plate 7.1 and the lower seat plate 7.2. A through hole is drilled on one side of the corresponding valve body 1. An installation tube is sealed and connected to the through hole. A pressure display device 12 is fixed to the outer end of the installation tube.

[0023] The upper seat plate 7.1 is provided with a positioning ring groove, and the lower end of the corresponding adjusting bolt 8 is arranged in the positioning ring groove. The positioning groove is used to fix the upper seat plate 7.1 and the adjusting bolt 8, so that the upper seat plate 7.1 and the adjusting bolt 8 cannot move relative to each other, and the diaphragm pressure measuring sensor 10 can always correctly collect the spring pressure.

[0024] The diaphragm pressure measuring sensor 10 at the right end of the valve body 1 is connected to the pressure display device 12 through a signal line 13. The signal line 13 is not hard connected, and has an up-down movement allowance.

[0025] The diaphragm pressure measuring sensor 10 is used to measure the spring force and display it through the pressure display device 12. The diaphragm pressure measuring sensor 10 is specifically an alloy diaphragm strain pressure sensor. The alloy diaphragm strain pressure sensor is a common type of pressure sensor, which is widely used in industries, aerospace, petrochemical industry and other fields. This kind of sensor uses sputtering thin film technology to deposit alloy diaphragm strain resistance on a metal elastic body, and converts the pressure signal into an electrical signal output through a Wheatstone bridge.

[0026] The pressure display device 12 is used to convert the collected pressure into an electrical display digital signal and display it. The pressure display device 12 can be integrated. The pressure display device 12 is a digital display intelligent instrument, such as the Changtai Z4T-H4.

[0027] The spring force is F=P×S, wherein P is the relative pressure of the pressure container or pipeline, S is the area of the air inlet, and F is the spring force measured by the diaphragm pressure measuring sensor 10 between the upper spring seat 1 and the upper spring seat 2.

[0028] The spring force can be displayed through the pressure display device 12, or monitored on the computer through analog quantity transmission. After the spring 6 is deformed in a complex and harsh environment or after action, it is very easy to monitor through the device. When the spring 6 is deformed, the monitored pressure value is inconsistent with the set value, and specific personnel can be notified to adjust the spring force F through the adjusting bolt, so that the relief pressure can be adjusted, without the need to replace a new spring or safety valve, and the reuse rate is improved.

[0029] The diaphragm pressure measuring sensor 10 of the present application can also be connected with a monitoring system at a rear monitoring platform, and has an alarm. When the safety valve is actuated each time, an alarm signal is provided. In addition, after the safety valve is actuated and the spring is linearly deformed in a harsh environment, the spring needs to be adjusted again when it is reused.

[0030] The value can be adjusted at any time when it is monitored to be inconsistent with the design value.

[0031] Working principle and process: When the set opening pressure value is F0, the spring force F1=F0 when the spring is not deformed, so when the pressure in the system reaches this set value, the safety valve will overcome the spring force and open the safety valve.

[0032] When the set opening pressure value is F0, the spring force F2<F0 after the spring is deformed (referring to the spring after long-term use, the spring constant is smaller than when it is first used, resulting in the spring force not reaching the effect when it is first used. After monitoring this situation, adjustment should be made before the safety valve opens to avoid the safety valve opening when the pressure in the system has not reached the set value). At this time, the monitored data does not match the set value, and if it is not adjusted, the safety valve will open when the pressure in the system has not reached the set value, resulting in waste of medium flow. The spring force can be increased by rotating the adjusting bolt 8 to make the spring force F2=F0.

[0033] When the set opening pressure value is F0, the spring force F3>F0 after the spring is deformed (referring to the spring force being set too large due to the adjusting bolt being rotated too tightly when setting the safety opening pressure, and there being no means to detect whether the spring force is equal to the opening pressure before the thin-film pressure measurement sensor is installed, generally relying on human experience and the mechanical opening indication on the safety valve, but this is not very accurate). At this time, the monitored data does not match the set value, and if it is not adjusted, the safety valve will not open when the pressure in the system reaches the set value, which will exist a safety hazard. The spring force can be reduced by rotating the adjusting bolt 8 to make the spring force F3=F0.

Claims

1. A safety valve capable of real-time measurement of opening pressure, comprising a valve body (1), a valve core (2), and a valve stem (3), characterized in that: The valve stem (3) is provided with a limiting ring (4) at the lower part. The valve stem (3) above the limiting ring (4) is provided with a lower spring seat (5), a spring (6) and an upper spring seat (7) in sequence from bottom to top. The upper part of the valve stem (3) freely passes through the center hole of the adjusting bolt (8) and extends out of the valve body (1). The adjusting bolt (8) is threaded to the valve body (1) and its lower end rests on the upper spring seat (7). A thin film pressure measuring sensor (10) is installed in the upper spring seat (7). The thin film pressure measuring sensor (10) is used to monitor the spring force in real time.

2. A safety valve capable of real-time measurement of opening pressure value according to claim 1, characterized in that: The thin-film pressure sensor (10) is electrically connected to the pressure display device (12) on one side, and the pressure display device (12) is located outside the valve body (1).

3. A safety valve capable of real-time measurement of opening pressure value according to claim 2, characterized in that: The upper spring seat (7) includes an upper seat plate (7.1) and a lower seat plate (7.2), and a thin-film pressure measuring sensor (10) is placed between the upper seat plate (7.1) and the lower seat plate (7.2).

4. A safety valve capable of real-time measurement of opening pressure value according to claim 3, characterized in that: The upper seat plate (7.1) and the lower seat plate (7.2) can be freely closed together.

5. A safety valve capable of real-time measurement of opening pressure value according to claim 4, characterized in that: A locking nut (9) is installed on the adjusting bolt (8) at the upper end of the valve body (1).

6. A safety valve capable of real-time measurement of opening pressure value according to claim 5, characterized in that: The upper seat plate (7.1) is provided with a positioning ring groove, and the lower end of the corresponding adjusting bolt (8) is placed in the positioning ring groove.

7. A safety valve capable of real-time measurement of opening pressure value according to claim 6, characterized in that: The upper seat plate (7.1) and lower seat plate (7.2) are made of cast iron.

8. A safety valve capable of real-time measurement of opening pressure value according to claim 7, characterized in that: An installation pipe is sealed and connected to a through hole on one side of the valve body (1), and a pressure display device (12) is fixed at the outer end of the installation pipe.

9. A safety valve capable of real-time measurement of opening pressure value according to claim 8, characterized in that: The pressure display device (12) is connected to the thin-film pressure measurement sensor (10) via a signal line.

10. A method for adjusting a safety valve capable of real-time measurement of opening pressure according to claim 9, characterized in that: When the set opening pressure value is F0, the spring force F1 = F0 when the spring has not deformed. When the pressure in the system reaches this set value, the safety valve will overcome the spring force and open the safety valve. When the set opening pressure value is F0, after the spring is deformed, the spring force F2 < F0. At this time, the monitored data does not match the set value. If it is not adjusted, the safety valve will be opened before the pressure in the system reaches the set value, resulting in the loss and waste of the medium. By rotating the adjusting bolt (8), the spring force is increased so that the spring force F2 = F0. When the set opening pressure value is F0, after the spring is deformed, the spring force F3>F0. At this time, the monitored data does not match the set value. If it is not adjusted, the safety valve will not open when the pressure in the system reaches the set value, which will pose a safety hazard. By rotating the adjusting bolt (8), the spring force is reduced so that the spring force F3=F0.

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