JP2020193631A - Safety valve and superconducting accelerator - Google Patents

Abstract

To provide a safety valve and a superconducting accelerator, which can be controlled without using external power and can individually set a blowing start pressure and a blowing stop pressure.SOLUTION: A safety valve 10 includes a fluid storage chamber (gas storage chamber 26), a first valve element 32, a second valve element 34, and an urging member 40. The fluid storage chamber communicates with the outside of a device and can seal a fluid under an internal pressure that is at least higher than the pressure outside the device. The first valve element 32 can open and close between a gas flow passage 22 communicating with the inside of the device and the outside of the device. The second valve element 34 is interlocked with the first valve element 32, and can open and close between the fluid storage chamber and the outside of the device. The urging member 40 urges the first valve element 32 or the second valve element 34 in a direction in which the second valve element 34 closes between the fluid storage chamber and the outside of the device. In the safety valve 10, when the internal pressure of the gas flow passage 22 opens the first valve element 32 against the internal pressure of the fluid storage chamber and the urging force of the urging member 40, the second valve element 34 is opened.SELECTED DRAWING: Figure 2

Description

The present invention relates to safety valves and superconducting accelerators.

The superconducting accelerator is a high-pressure gas facility equipped with a pressure vessel for storing liquefied helium and liquefied nitrogen used as a refrigerant and a pipe for flowing the refrigerant. In high-pressure gas equipment, it is necessary to install a safety device that releases the pressure and returns it to the allowable pressure or less when the internal pressure of the pressure vessel or piping rises and exceeds a predetermined value. Conventionally, a spring-type valve that opens when a pressure higher than the reaction force of the spring is applied to the valve body, a passive automatic valve that forcibly drives the valve body by electromagnetic force or air pressure, and a partition wall that exceeds the allowable pressure. Safety devices such as burst plates that burst are known. For example, Patent Document 1 discloses a safety valve whose operating pressure can be adjusted by adjusting the position of a permanent magnet.

Japanese Patent No. 4143718

In the spring-loaded valve, the pressure for fully open and fully closed operation is limited to the set pressure. The set pressure is generally set so that the pressure normally used is lower than the allowable pressure according to the allowable pressure of the pressure vessel or piping. For this reason, the spring-loaded valve does not have the function of adjusting the pressure to the pressure normally used. In the safety valve of Patent Document 1, the operating pressure can be easily set, but the blowing start pressure, which is the pressure when the valve is opened, and the blowing stop pressure, which is the pressure when the valve is closed, are set. Cannot be adjusted individually. In the other-power automatic valve, it is possible to open and close the valve corresponding to the arbitrarily and individually set blow start pressure and blow stop pressure, but for example, it does not operate when the power supply is stopped due to a power failure.

The present invention has been made in view of the above, and provides a safety valve and a superconducting accelerator that can be controlled without using external power and can individually set the blowing start pressure and the blowing stop pressure. The purpose.

The safety valve of the present invention includes a fluid storage chamber that communicates with the outside of the device and can seal a fluid under an internal pressure higher than the pressure outside the device, a gas flow path that communicates with the inside of the device, and the device. A first valve body that can be opened and closed between the outside of the device and a second valve that is interlocked with the first valve body and can be opened and closed between the fluid storage chamber and the outside of the device. A body and an urging member for urging the first valve body or the second valve body in a direction in which the second valve body closes between the fluid storage chamber and the outside of the device, and said When the internal pressure of the gas flow path opens the first valve body against the internal pressure of the fluid storage chamber and the urging force of the urging member, the second valve body is opened.

According to this configuration, when the first valve body and the second valve body are closed, the internal pressure of the gas flow path exceeds the sum of the urging force of the urging member and the internal pressure of the fluid storage chamber. The 1st valve body and the 2nd valve body are opened. When the second valve body is opened, the internal pressure of the fluid storage chamber is reduced to the same level as the external pressure of the device. Therefore, in the state where the first valve body and the second valve body are open, the internal pressure of the gas flow path is lower than the urging force of the urging member, so that the first valve body and the second valve body are closed. .. That is, the blow-off pressure can be adjusted by setting the urging force of the urging member. Further, the differential pressure between the blowing start pressure and the blowing stop pressure can be adjusted by setting the internal pressure of the fluid storage chamber before operation. As a result, the blowing start pressure and the blowing stop pressure can be set individually. Further, since it can be controlled without using electric power, it can be operated even in the event of a power failure.

Further, a fluid supply path connected to the fluid storage chamber to supply the fluid to the fluid storage chamber, and a shutoff valve capable of opening and closing the fluid supply path are provided.

According to this configuration, the fluid storage chamber can be replenished with fluid while the second valve body is closed. That is, after the safety valve is activated once and the first valve body and the second valve body are closed, the fluid storage chamber can be replenished with fluid even when the device provided with the safety valve is in operation. It is possible to reuse the safety valve while continuing to operate.

Further, when the internal pressure of the fluid storage chamber is equal to or lower than a predetermined pressure in the state where the second valve body is closed, the closing valve is opened and the fluid is supplied to the fluid storage chamber via the fluid supply path. It is provided with a control unit for supplying a fluid.

According to this configuration, the internal pressure of the fluid storage chamber can be more preferably maintained. Further, after the safety valve is activated once, the fluid storage chamber can be more preferably replenished with fluid.

Further, the fluid supply path is connected to the gas flow path and is supplied as a fluid for storing gas in the fluid storage chamber from the gas flow path.

According to this configuration, the gas passing through the gas flow path can be used as a fluid to be stored in the fluid storage chamber.

Further, it is provided with a relief flow path that communicates with the outside of the device and communicates with the gas flow path and the fluid storage chamber in a state where the first valve body and the second valve body are open.

According to this configuration, the gas in the gas flow path and the fluid in the fluid storage chamber are discharged to the outside of the device through the escape flow path which is a common flow path, which can contribute to the simplification of the safety valve. ..

The superconducting accelerator of the present invention is provided with the safety valve.

According to this configuration, when the first valve body and the second valve body are closed, the internal pressure of the gas flow path exceeds the sum of the urging force of the urging member and the internal pressure of the fluid storage chamber. The 1st valve body and the 2nd valve body are opened. When the second valve body is opened, the internal pressure of the fluid storage chamber is reduced to the same level as the external pressure of the superconducting accelerator. Therefore, in the state where the first valve body and the second valve body are open, the internal pressure of the gas flow path is lower than the urging force of the urging member, so that the first valve body and the second valve body are closed. .. That is, the blow-off pressure can be adjusted by setting the urging force of the urging member. Further, the differential pressure between the blowing start pressure and the blowing stop pressure can be adjusted by setting the internal pressure of the fluid storage chamber before operation. As a result, the blowing start pressure and the blowing stop pressure can be set individually. Further, since it can be controlled without using electric power, it can be operated even in the event of a power failure.

FIG. 1 is a schematic view showing an example of a superconducting accelerator to which the safety valve according to the embodiment is applied. FIG. 2 is a schematic view showing an example of the safety valve according to the embodiment. FIG. 3 is a graph showing an example of a time change of the internal pressure in the safety valve according to the embodiment. FIG. 4 is a schematic view showing immediately before the start of blowing of the safety valve according to the embodiment. FIG. 5 is a schematic view showing an operating state of the safety valve according to the embodiment. FIG. 6 is a schematic view showing immediately before the safety valve of the embodiment has stopped blowing. FIG. 7 is a schematic view showing immediately after the safety valve of the embodiment has stopped blowing. FIG. 8 is a schematic view showing preparations for reuse of the safety valve according to the embodiment.

Hereinafter, embodiments of the safety valve and the superconducting accelerator according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, those that are substantially the same, or those that are in the same range. Furthermore, the components described below can be combined as appropriate. Various omissions, replacements or changes of components may be made without departing from the gist of the following embodiments. In the following embodiments, necessary components will be described and other components will be omitted in exemplifying one of the embodiments of the safety valve and the superconducting accelerator according to the present invention. In the following description of the embodiment, the same configuration will be designated by the same reference numerals, and different configurations will be designated by different reference numerals.

[Structure of superconducting accelerator]
FIG. 1 is a schematic view showing an example of a superconducting accelerator to which the safety valve according to the embodiment is applied. In the embodiment, the superconducting accelerator 100 includes a vacuum vessel 110 and a superconducting acceleration cavity 120. The vacuum vessel 110 houses the superconducting acceleration cavity 120. The inside of the vacuum vessel 110 is kept in a substantially vacuum state by a vacuum device, and heat outside the vacuum vessel 110 is prevented from being transferred to the superconducting acceleration cavity 120. The superconducting acceleration cavity 120 is arranged inside the vacuum vessel 110. The superconducting acceleration cavity 120 includes a cavity body 130 and a refrigerant tank 140.

The cavity body 130 is formed in a tubular shape by a superconducting material such as niobium (Nb). The cavity body 130 includes a plurality of large diameter portions 130b and a plurality of small diameter portions 130c. The distance R1 from the central axis A of the large diameter portion 130b is larger than the distance R2 from the central axis A of the small diameter portion 130c. In the cavity body 130, large diameter portions 130b and small diameter portions 130c are alternately formed in the central axis A direction. The cavity body 130 includes an inlet portion 130d and an outlet portion 130e which are openings at both ends in the direction of the central axis A. The inlet 130d is connected to the inlet pipe 150 to which charged particles from the outside are guided. The inlet 130d guides the charged particles guided from the inlet tube 150 to the cavity body 130. The outlet portion 130e is connected to an outlet pipe 160 that guides charged particles to the outside. The outlet portion 130e guides the charged particles accelerated by the cavity body 130 to the outlet tube 160. The outlet portion 130e is further connected to a waveguide 170 for introducing high frequency power generated by a high frequency source such as a klystron into the inside of the cavity body 130. When high-frequency power is applied from the outside through the waveguide 170, positive electrodes and negative electrodes are generated on the inner surface of the cavity body 130, and an accelerating electric field for accelerating charged particles is generated.

The refrigerant tank 140 is provided around the cavity body 130. The refrigerant tank 140 and the cavity main body 130 are firmly joined by welding or the like where they come into contact with each other. The refrigerant tank 140 stores the refrigerant in a space formed between the refrigerant tank 140 and the outer peripheral surface of the cavity body 130. The refrigerant is, for example, liquid helium. The refrigerant tank 140 includes a supply port 140a and a discharge port 140b. The supply port 140a is connected to the supply pipe 180 for supplying the refrigerant. The supply port 140a supplies the refrigerant supplied from the external refrigerant tank to the refrigerant tank 140 via the supply pipe 180. The refrigerant stored in the refrigerant tank 140 is used to cool the cavity body 130 to an extremely low temperature and keep it in a superconducting state. A part of the refrigerant stored in the refrigerant tank 140 is gasified by absorbing the heat generated in the cavity main body 130. When the refrigerant is liquid helium, the refrigerant gas is helium gas. The discharge port 140b is connected to a discharge pipe 190 that discharges the refrigerant gas. The discharge port 140b is discharged to the outside of the superconducting accelerator 100 via the discharge pipe 190. The refrigerant gas discharged to the outside is compressed by a compressor to be liquefied again and returned to the refrigerant tank.

[Safety valve configuration]
FIG. 2 is a schematic view showing an example of the safety valve according to the embodiment. The safety valve 10 is a safety device that returns the pressure inside the device to the allowable pressure Pa or less. In the embodiment, it is assumed that the safety valve 10 is provided in the refrigerant pipe through which the refrigerant gas passes in the superconducting accelerator 100. In the embodiment, the refrigerant pipe includes the discharge pipe 190 shown in FIG. The refrigerant gas is, for example, an inert gas such as helium gas. As shown in FIG. 5, the safety valve 10 is provided in the housing 20. The safety valve 10 includes a valve body 30, an urging member 40, a sealing member 50, a gas supply path 60, a closing valve 62, and an internal pressure gauge 64.

The housing 20 communicates with the inside of the device such as a refrigerant pipe and the outside of the device. The safety valve 10 of the embodiment can be operated as long as the outside of the device is in an environment where the pressure is at least lower than the operating pressure P1 of the device. The external pressure P0 of the device is, for example, atmospheric pressure. The housing 20 includes a gas flow path 22, a relief flow path 24, a gas storage chamber 26, and a stop portion 28 inside.

In the embodiment, the gas flow path 22 includes a refrigerant pipe through which the refrigerant gas passes. The upstream of the gas flow path 22 communicates with the inside of the apparatus. More specifically, the upstream of the gas flow path 22 communicates with the discharge pipe 190 shown in FIG. 1 in the embodiment. The downstream side of the gas flow path 22 communicates with the outside of the device via the relief flow path 24 in a state where the first valve body 32 described later is open.

The relief flow path 24 connects the inside of the housing 20 to the outside of the device. The relief flow path 24 communicates with the outside of the device at the opening 24e. The relief flow path 24 communicates with the gas flow path 22 in a state where the first valve body 32, which will be described later, is open. In the relief flow path 24, the refrigerant gas discharged from the gas flow path 22 to the outside of the device passes through the state in which the first valve body 32 is open. The relief flow path 24 communicates with the gas storage chamber 26 in a state where the second valve body 34, which will be described later, is open. In the relief flow path 24, the gas released from the gas storage chamber 26 to the outside of the apparatus passes through the state in which the second valve body 34 is open.

Gas is stored in the gas storage chamber 26. The gas storage chamber 26 is connected to the gas supply path 60. Gas is supplied from the gas storage chamber 26 from the gas supply path 60. The supply of gas from the gas supply path 60 to the gas storage chamber 26 can be stopped by a shutoff valve 62 provided in the gas supply path 60. The gas stored in the gas storage chamber 26 may be the same gas as the refrigerant gas passing through the gas flow path 22, or a different gas. The gas storage chamber 26 communicates with the outside of the device via the relief flow path 24 in a state where the second valve body 34, which will be described later, is open. The gas storage chamber 26 can seal the gas under an internal pressure Pc higher than the external pressure P0 of the device at least in a state where the second valve body 34 and the closing valve 62 are closed. In the embodiment, the gas storage chamber 26 can seal the gas under an internal pressure Pc higher than the operating pressure P1 of the device.

The stop portion 28 limits the movement of the urging member 40 of the first valve body 32 and the second valve body 34 in the urging direction. The stopper 28 supports at least one of the first valve body 32 and the second valve body 34 at a predetermined position. In the embodiment, the stop portion 28 is provided at the boundary between the gas storage chamber 26 and the relief flow path 24. In the embodiment, the stopper 28 is a protrusion that projects inward from the inner wall of the housing 20. The stop portion 28 supports the second valve body 34 so that the second valve body 34, which will be described later, does not escape from the gas storage chamber 26 and protrude toward the flow path 24 side.

In the embodiment, the valve body 30 is movable in the gas flow direction in the gas flow path 22. The valve body 30 includes a first valve body 32, a second valve body 34, and a connecting portion 36.

The first valve body 32 can be opened and closed between the gas flow path 22 and the outside of the device. In the embodiment, the first valve body 32 is provided at the boundary between the gas flow path 22 and the relief flow path 24. In the embodiment, the first valve body 32 is connected to the second valve body 34 via the connecting portion 36. The first valve body 32 is interlocked with the second valve body 34. When the first valve body 32 is closed, the internal pressure Pb due to the refrigerant gas passing through the gas flow path 22 urges the first valve body 32 in the opening direction. When the internal pressure Pb of the gas flow path 22 exceeds the allowable pressure Pa, the first valve body 32 moves in the direction of the relief flow path 24 and opens between the gas flow path 22 and the relief flow path 24. When the first valve body 32 is open, the gas flow path 22 and the relief flow path 24 communicate with each other. When the first valve body 32 is open, the refrigerant gas in the gas flow path 22 is discharged to the outside of the device via the escape flow path 24.

The second valve body 34 can be opened and closed between the gas storage chamber 26 and the outside of the device. In the embodiment, the second valve body 34 is provided at the boundary between the gas storage chamber 26 and the relief flow path 24. In the embodiment, the second valve body 34 is connected to the first valve body 32 via the connecting portion 36. The second valve body 34 is interlocked with the first valve body 32. In the embodiment, the second valve body 34 is constantly urged in the closing direction by the urging force Fs of the urging member 40. When the second valve body 34 is closed, the internal pressure Pc due to the gas stored in the gas storage chamber 26 urges the second valve body 34 in the direction of closing. The second valve body 34 is supported by the stop portion 28 so as not to protrude toward the relief flow path 24 side. The second valve body 34 is provided with a sealing member 50 at a contact position with the stop portion 28. The space between the second valve body 34 and the stop portion 28 is sealed by the sealing member 50. When the internal pressure Pb of the gas flow path 22 exceeds the permissible pressure Pa, the second valve body 34 moves inside the gas storage chamber 26 in conjunction with the first valve body 32, and moves to the inside of the gas storage chamber 26 and escapes from the gas storage chamber 26. Open the space with 24. When the second valve body 34 is open, the gas storage chamber 26 and the relief flow path 24 communicate with each other. When the second valve body 34 is open, the gas in the gas storage chamber 26 is discharged to the outside of the device through the escape flow path 24.

The connecting portion 36 connects the first valve body 32 and the second valve body 34. In the connecting portion 36, the first valve body 32 opens between the gas flow path 22 and the relief flow path 24, and at the same time, the second valve body 34 opens between the gas storage chamber 26 and the relief flow path 24. As long as the first valve body 32 and the second valve body 34 are interlocked with each other, they may be connected in any way.

The urging member 40 constantly urges the first valve body 32 or the second valve body 34 in the direction in which the second valve body 34 closes between the gas storage chamber 26 and the outside of the device. The urging member 40 is, in the embodiment, a compression spring provided between the inner wall of the gas storage chamber 26 and the second valve body 34. In the embodiment, the urging member 40 constantly urges the second valve body 34 in a direction in which the second valve body 34 closes between the gas storage chamber 26 and the relief flow path 24.

The sealing member 50 is provided on the second valve body 34 in the embodiment. The sealing member 50 is provided at a contact position with the stop portion 28. When the second valve body 34 is closed, the stop portion 28, the second valve body 34, and the sealing member 50 seal between the gas storage chamber 26 and the relief flow path 24. When the safety valve 10 of the embodiment is applied to the superconducting accelerator 100, the sealing member 50 needs to be a material that can withstand the low temperature of the refrigerant gas and the radiation generated by the superconducting accelerator 100. As the material of the sealing member 50 of the safety valve 10 applied to the superconducting accelerator 100, for example, ethylene propylene diene rubber (EPDM) or nitrile butadiene rubber (NBR) can be used.

The gas supply path 60 is connected to the gas storage chamber 26. The gas supply path 60 supplies gas to the gas storage chamber 26. The gas supply path 60 is provided with a shutoff valve 62 that controls the supply of gas to the gas storage chamber 26. The gas supply path 60 may be provided with a blower for drawing gas into the gas storage chamber 26.

The shutoff valve 62 is provided in the gas supply path 60. The shutoff valve 62 controls the supply of gas passing through the gas supply path 60 to the gas storage chamber 26. The gas passing through the gas supply path 60 is supplied to the gas storage chamber 26 in a state where the shutoff valve 62 is open. The gas passing through the gas supply path 60 is not supplied to the gas storage chamber 26 in a state where the shutoff valve 62 is closed. The gas storage chamber 26 is sealed while the second valve body 34 and the closing valve 62 are closed. The shutoff valve 62 may be manually operated by an operator, or may be controlled by a control unit or an external control device of a device provided with the safety valve 10. The shutoff valve 62 may be controlled to be opened when the internal pressure Pc of the gas storage chamber 26 is equal to or lower than a predetermined pressure in a state where the second valve body 34 is closed.

The internal pressure gauge 64 measures the internal pressure Pc of the gas storage chamber 26. After the second valve body 34 is closed when the second valve body 34 is opened and the internal pressure Pc of the gas storage chamber 26 is lowered, for example, the worker checks the numerical value of the internal pressure gauge 64 and closes the valve 62. Is opened, and gas is supplied until the internal pressure Pc of the gas storage chamber 26 reaches a predetermined pressure.

[Operation of safety valve]
FIG. 3 is a graph showing an example of a time change of the internal pressure in the safety valve according to the embodiment. FIG. 4 is a schematic view showing immediately before the start of blowing of the safety valve according to the embodiment. FIG. 5 is a schematic view showing an operating state of the safety valve according to the embodiment. FIG. 6 is a schematic view showing immediately before the safety valve of the embodiment has stopped blowing. FIG. 7 is a schematic view showing immediately after the safety valve of the embodiment has stopped blowing. FIG. 8 is a schematic view showing preparations for reuse of the safety valve according to the embodiment.

FIG. 3 shows the time change of the internal pressure of the refrigerant pipe. In the following description, it is assumed that the internal pressure of the refrigerant pipe is the same as the internal pressure Pb of the gas flow path 22. It is assumed that gas is stored in advance in the gas storage chamber 26 of the safety valve 10 so that the internal pressure is Pc. Before the start of operation of the device provided with the safety valve 10, the internal pressure Pb of the gas flow path 22 is the same as the external pressure P0 of the device.

The internal pressure Pb gradually increases when the device starts operation at time t0, and reaches the operating pressure P1 at time t1. The internal pressure Pb stabilizes at the operating pressure P1 from time t1 to time t2. When the pressure inside the device rises for some reason, the internal pressure Pb of the gas flow path 22 also rises. The internal pressure Pb begins to rise at time t2 in the embodiment. The internal pressure Pb rises from time t2 until time t3 when the pressure P2 is reached.

As shown in step ST202 of FIG. 4, the first valve body 32 and the second valve body 34 are in a closed state. From time t0 to time t3 including step ST202, the internal pressure Pb of the gas flow path 22, the internal pressure Pc of the gas storage chamber 26, and the urging force Fs of the urging member 40 are Pb <Pc + Fs.

The internal pressure Pb exceeds the permissible pressure Pa and starts blowing at time t3 and reaches the pressure P2. At time t3, the internal pressure Pb of the gas flow path 22, the internal pressure Pc of the gas storage chamber 26, and the urging force Fs of the urging member 40 are Pb ≧ Pc + Fs. When the internal pressure Pb starts to blow and reaches the pressure P2, the first valve body 32 and the second valve body 34 move in the opening direction as shown in step ST204 of FIG.

The internal pressure Pb of the gas flow path 22 opens the first valve body 32 against the internal pressure Pc of the gas storage chamber 26 and the urging force Fs of the urging member 40. That is, the first valve body 32 moves in the direction of the relief flow path 24 due to the internal pressure Pb of the gas flow path 22. As a result, the first valve body 32 opens between the gas flow path 22 and the relief flow path 24. When the first valve body 32 is opened and the gas flow path 22 and the relief flow path 24 communicate with each other, the refrigerant gas in the gas flow path 22 starts to be discharged to the outside of the device through the relief flow path 24. From time t3 to t4 including step ST204, the internal pressure Pb of the gas flow path 22 stops rising. Further, after the time t4, the internal pressure Pb of the gas flow path 22 gradually decreases.

The internal pressure Pb of the gas flow path 22 opens the second valve body 34 against the internal pressure Pc of the gas storage chamber 26 and the urging force Fs of the urging member 40. That is, the second valve body 34 moves inside the gas storage chamber 26 in conjunction with the first valve body 32 that moves in the direction of the relief flow path 24 due to the internal pressure Pb of the gas flow path 22. As a result, the second valve body 34 opens between the gas storage chamber 26 and the relief flow path 24. When the second valve body 34 is opened and the gas storage chamber 26 and the relief flow path 24 communicate with each other, the gas in the gas storage chamber 26 starts to be released to the outside of the device through the relief flow path 24.

As shown in step ST206 of FIG. 6, since new gas is not supplied to the gas storage chamber 26, the internal pressure Pc of the gas storage chamber 26 is the external pressure of the device when the second valve body 34 is open. It decreases to the same level as P0. When the internal pressure Pb of the gas flow path 22 is sufficiently reduced, the first valve body 32 and the second valve body 34 start moving in the closing direction by the urging force Fs of the urging member 40.

The internal pressure Pb reaches the stop pressure P3 at time t5. The blow-off pressure P3 is the same as the operating pressure P1 in the embodiment. During the period from time t3 to time t5 including step ST204 and step ST206 described later, the internal pressure Pb of the gas flow path 22, the internal pressure Pc of the gas storage chamber 26, and the urging force Fs of the urging member 40 are Pb = Pc + Fs. Is. At time t5, the internal pressure Pb of the gas flow path 22, the internal pressure Pc of the gas storage chamber 26, and the urging force Fs of the urging member 40 are Pb ≦ Pc + Fs. As described above, when the internal pressure Pc of the gas storage chamber 26 is reduced to the same level as the external pressure P0 of the device, Pb ≦ Fs at time t5. When the internal pressure Pb reaches the blow-off pressure P3, the first valve body 32 and the second valve body 34 are closed as shown in step ST208 of FIG.

After the first valve body 32 is opened, when the internal pressure Pb of the gas flow path 22 falls below the blow-off pressure P3, the first valve body 32 moves in the direction of exiting from the relief flow path 24 by the urging force Fs of the urging member 40. As a result, the first valve body 32 closes between the gas flow path 22 and the relief flow path 24. When the first valve body 32 is closed and the space between the gas flow path 22 and the relief flow path 24 is closed, the discharge of the refrigerant gas in the gas flow path 22 to the outside of the device is stopped.

After the second valve body 34 is opened, when the internal pressure Pb of the gas flow path 22 falls below the blow-off pressure P3, the second valve body 34 moves in the direction of the relief flow path 24 by the urging force Fs of the urging member 40. As a result, the second valve body 34 closes between the gas storage chamber 26 and the relief flow path 24. The gas storage chamber 26 is sealed again by closing the second valve body 34 and closing between the gas storage chamber 26 and the relief flow path 24.

After the first valve body 32 and the second valve body 34 are closed again at time t5, when it can be confirmed that the internal pressure Pb of the gas flow path 22 is stable at the operating pressure P1, the worker is shown in FIG. As shown in step ST210, the shutoff valve 62 is opened. By opening the shutoff valve 62, gas is supplied to the gas storage chamber 26 via the gas supply path 60. The worker supplies gas until the internal pressure Pc of the gas storage chamber 26 reaches a predetermined pressure while checking the numerical value of the internal pressure gauge 64.

In this way, when the second valve body 34 of the safety valve 10 is opened, the internal pressure Pc of the gas storage chamber 26 is reduced to the same level as the external pressure P0 of the device, so that the first valve body 32 and the second valve body 34 are The urging member 40 is closed according to the value of the internal pressure Pb of the gas flow path 22 with respect to the urging force Fs. That is, the urging force Fs of the urging member 40 is set based on the blow-off pressure P3 in which the first valve body 32 and the second valve body 34 are closed.

Further, in the safety valve 10, when the first valve body 32 and the second valve body 34 are closed, the first valve body 32 and the second valve body 34 have the urging force Fs of the urging member 40 and the gas storage chamber. It is opened according to the value of the internal pressure Pb of the gas flow path 22 with respect to the sum of the internal pressure Pc of 26. That is, the internal pressure Pc of the gas storage chamber 26 before the safety valve 10 is activated is set based on the differential pressure between the blowing start pressure P2 and the blowing stop pressure P3.

Although the embodiments of the present invention have been described above, the embodiments are not limited by the contents of the embodiments. For example, in the safety valve 10 of the embodiment, the gas flow path 22 and the gas storage chamber 26 communicate with the outside of the device via the escape flow path 24, which is a common flow path, but reach the outside of the device via separate flow paths. You may communicate. If the safety valve 10 releases the refrigerant gas in the gas flow path 22 to the outside of the device and the gas in the gas storage chamber 26 to the outside of the device when the valve body 30 moves from the closed position to the open position. , It may be configured in any way.

When the internal pressure Pb of the gas flow path 22 and the internal pressure Pc of the gas storage chamber 26 are opened by opening different flow paths, the gas storage chamber 26 may be a liquid storage chamber. In this case, the fluid supply path is connected to the liquid storage chamber instead of the gas supply path 60. That is, the gas storage chamber 26 may be a fluid storage chamber containing gas and liquid.

The gas supply path 60 may be connected to the gas flow path 22 and the refrigerant gas may be supplied from the gas flow path 22. That is, the gas storage chamber 26 may supply the refrigerant gas in the gas flow path 22 via the gas supply path 60.

Whatever the urging member 40 is, as long as the second valve body 34 constantly urges the first valve body 32 or the second valve body 34 in the direction of closing the space between the gas storage chamber 26 and the outside of the device. It may be a thing. In the embodiment, the urging member 40 is a compression spring provided between the inner wall of the gas storage chamber 26 and the second valve body 34, but may include, for example, a weight or a magnet.

As described above, the safety valve 10 of the embodiment includes a fluid storage chamber (gas storage chamber 26), a first valve body 32, a second valve body 34, and an urging member 40. The fluid storage chamber communicates with the outside of the device. The fluid storage chamber can seal the fluid under an internal pressure Pc that is at least higher than the external pressure of the device. The first valve body 32 can open and close between the gas flow path 22 communicating with the inside of the device and the outside of the device. The second valve body 34 is interlocked with the first valve body 32, and can open and close the space between the fluid storage chamber and the outside of the device. The urging member 40 urges the first valve body 32 or the second valve body 34 in a direction in which the second valve body 34 closes between the fluid storage chamber and the outside of the device. In the safety valve 10, when the internal pressure Pb of the gas flow path 22 opens the first valve body 32 against the internal pressure Pc of the fluid storage chamber and the urging force Fs of the urging member 40, the second valve body 34 is opened.

As a result, when the first valve body 32 and the second valve body 34 are closed, the internal pressure Pb of the gas flow path 22 is the urging force Fs of the urging member 40 and the fluid storage chamber (gas storage chamber 26). By exceeding the sum of the internal pressures Pc, the first valve body 32 and the second valve body 34 are opened. When the second valve body 34 is opened, the internal pressure Pc of the fluid storage chamber is reduced to the same level as the external pressure of the device. Therefore, when the first valve body 32 and the second valve body 34 are open, the internal pressure Pb of the gas flow path 22 is lower than the urging force Fs of the urging member 40, so that the first valve body 32 and the second valve body 32 and the second valve body 34 are open. 2 The valve body 34 is closed. That is, the blow-off pressure P3 can be adjusted by setting the urging force Fs of the urging member 40. Further, the differential pressure between the blowing start pressure P2 and the blowing stop pressure P3 can be adjusted by setting the internal pressure Pc of the fluid storage chamber before operation. As a result, the blowing start pressure P2 and the blowing stop pressure P3 can be set individually. Further, since it can be controlled without using electric power, it can be operated even in the event of a power failure.

Further, the safety valve 10 of the embodiment includes a fluid supply path (gas supply path 60) and a shutoff valve 62. The fluid supply path is connected to the fluid storage chamber (gas storage chamber 26) to supply the fluid (gas) to the fluid storage chamber. The shutoff valve 62 can open and close the fluid supply path. As a result, the fluid can be replenished in the fluid storage chamber while the second valve body 34 is closed. That is, after the safety valve 10 is operated once and the first valve body 32 and the second valve body 34 are closed, the fluid storage chamber can be replenished with fluid even when the device provided with the safety valve 10 is in operation. Therefore, it is possible to reuse the safety valve 10 while the device continues to operate.

Further, the safety valve 10 of the embodiment may include a control unit. When the internal pressure Pc of the fluid storage chamber (gas storage chamber 26) is equal to or lower than a predetermined pressure in a state where the second valve body 34 is closed, the control unit opens the shutoff valve 62 to open the fluid supply path (gas). A fluid (gas) is supplied to the fluid storage chamber via the supply path 60). Thereby, the internal pressure Pc of the fluid storage chamber can be more preferably maintained. Further, after the safety valve 10 is operated once, the fluid storage chamber can be more preferably replenished with fluid.

Further, in the safety valve 10 of the embodiment, the fluid supply path (gas supply path 60) is connected to the gas flow path 22. The fluid supply path is supplied from the gas flow path 22 as a fluid (gas) that stores the gas (fusolescent gas) in the fluid storage chamber (gas storage chamber 26), whereby the gas passing through the gas flow path 22 is fluidly stored. It can be used as a fluid to be stored in the room.

Further, the safety valve 10 of the embodiment includes a relief flow path 24. The relief flow path 24 communicates with the outside of the device. The relief flow path 24 communicates with the gas flow path 22 and the fluid storage chamber (gas storage chamber 26) in a state where the first valve body 32 and the second valve body 34 are open, whereby the gas flow path 22 Since the gas inside (refrigerant gas) and the fluid in the fluid storage chamber are discharged to the outside of the device through the escape flow path 24 which is a common flow path, it can contribute to the simplification of the safety valve 10.

Further, in the embodiment, the superconducting accelerator 100 is provided with a safety valve 10. As a result, when the first valve body 32 and the second valve body 34 are closed, the internal pressure Pb of the gas flow path 22 is the urging force Fs of the urging member 40 and the fluid storage chamber (gas storage chamber 26). By exceeding the sum of the internal pressures Pc, the first valve body 32 and the second valve body 34 are opened. When the second valve body 34 is opened, the internal pressure Pc of the fluid storage chamber decreases to the same level as the external pressure of the superconducting accelerator 100. Therefore, when the first valve body 32 and the second valve body 34 are open, the internal pressure Pb of the gas flow path 22 is lower than the urging force Fs of the urging member 40, so that the first valve body 32 and the second valve body 32 and the second valve body 34 are open. 2 The valve body 34 is closed. That is, the blow-off pressure P3 can be adjusted by setting the urging force Fs of the urging member 40. Further, the differential pressure between the blowing start pressure P2 and the blowing stop pressure P3 can be adjusted by setting the internal pressure Pc of the fluid storage chamber before operation. As a result, the blowing start pressure P2 and the blowing stop pressure P3 can be set individually. Further, since it can be controlled without using electric power, it can be operated even in the event of a power failure.

High-pressure gas equipment such as a superconducting accelerator may be provided with an electromagnetic safety valve in addition to the safety valve of the present invention. For example, an electromagnetic safety valve may be used when energized, and the safety valve of the present invention may be used only during a power failure. In this case, the release of gas (fluid) in the gas storage chamber 26 (fluid storage chamber) can be suppressed. As a result, gas (fluid) consumption and resupply can be suppressed.

High-pressure gas equipment such as a superconducting accelerator may be provided with a rupture disc in addition to the safety valve of the present invention. The ruptured plate includes, for example, a stainless steel plate material. When the internal pressure of the device exceeds a predetermined pressure, the rupture plate tears the internal pressure of the device to the pressure outside the device. By setting the pressure at which the rupture disc operates to be greater than the permissible pressure of the safety valve, the pressure inside the device will rise sharply, even if the pressure inside the device continues to rise even if the safety valve operates. Damage can be suppressed.

10 Safety valve 20 Housing 22 Gas flow path 24 Relief flow path 24e Opening 26 Gas storage chamber (fluid storage chamber)
28 Stopping part 30 Valve body 32 1st valve body 34 2nd valve body 36 Connecting part 40 Biasing member 50 Sealing member 60 Gas supply path 62 Closing valve 64 Internal pressure gauge 100 Superconducting accelerator 110 Vacuum vessel 120 Superconducting acceleration cavity 130 Cavity body 130b Large diameter part 130c Small diameter part 130d Inlet part 130e Outlet part 140 Refrigerator tank 140a Supply port 140b Outlet 150 Inlet pipe 160 Outlet pipe 170 waveguide 180 Supply pipe 190 Outlet pipe A Central axis R1, R2 Distance P0 External pressure P1 Operating pressure P2 Blow start pressure P3 Blow stop pressure Pa Allowable pressure Pb, Pc Internal pressure Fs urging force

The safety valve of the present invention includes a fluid storage chamber that communicates with the outside of the device and can seal a fluid under an internal pressure higher than the pressure outside the device, a gas flow path that communicates with the inside of the device, and the device. A first valve body that can be opened and closed between the outside of the device and a second valve that is interlocked with the first valve body and can be opened and closed between the fluid storage chamber and the outside of the device. A body and an urging member for urging the first valve body or the second valve body in a direction in which the second valve body closes between the fluid storage chamber and the outside of the device, and said force, the first valve body against the urging force of the force and the biasing member acting on said second valve member by the internal pressure of the fluid storage chamber that acts on the first valve body by the internal pressure of the gas flow path When is opened, the second valve body is opened.

The first valve body 32 can be opened and closed between the gas flow path 22 and the outside of the device. In the embodiment, the first valve body 32 is provided at the boundary between the gas flow path 22 and the relief flow path 24. In the embodiment, the first valve body 32 is connected to the second valve body 34 via the connecting portion 36. The first valve body 32 is interlocked with the second valve body 34. When the first valve body 32 is closed, the force Fb acting on the first valve body 32 due to the internal pressure Pb due to the refrigerant gas passing through the gas flow path 22 is urged in the direction of opening the first valve body 32. To do. When the internal pressure Pb of the gas flow path 22 exceeds the allowable pressure Pa, the first valve body 32 moves in the direction of the relief flow path 24 and opens between the gas flow path 22 and the relief flow path 24. When the first valve body 32 is open, the gas flow path 22 and the relief flow path 24 communicate with each other. When the first valve body 32 is open, the refrigerant gas in the gas flow path 22 is discharged to the outside of the device via the escape flow path 24.

The second valve body 34 can be opened and closed between the gas storage chamber 26 and the outside of the device. In the embodiment, the second valve body 34 is provided at the boundary between the gas storage chamber 26 and the relief flow path 24. In the embodiment, the second valve body 34 is connected to the first valve body 32 via the connecting portion 36. The second valve body 34 is interlocked with the first valve body 32. In the embodiment, the second valve body 34 is constantly urged in the closing direction by the urging force Fs of the urging member 40. When the second valve body 34 is closed, the force Fc acting on the second valve body 34 due to the internal pressure Pc due to the gas stored in the gas storage chamber 26 is urged in the direction of closing the second valve body 34. To do. The second valve body 34 is supported by the stop portion 28 so as not to protrude toward the relief flow path 24 side. The second valve body 34 is provided with a sealing member 50 at a contact position with the stop portion 28. The space between the second valve body 34 and the stop portion 28 is sealed by the sealing member 50. When the internal pressure Pb of the gas flow path 22 exceeds the allowable pressure Pa, the second valve body 34 moves to the inside of the gas storage chamber 26 in conjunction with the first valve body 32, and moves to the inside of the gas storage chamber 26 and escapes from the gas storage chamber 26. Open the space with 24. When the second valve body 34 is open, the gas storage chamber 26 and the relief flow path 24 communicate with each other. When the second valve body 34 is open, the gas in the gas storage chamber 26 is discharged to the outside of the device through the escape flow path 24.

As shown in step ST202 of FIG. 4, the first valve body 32 and the second valve body 34 are in a closed state. From time t0 to time t3 including step ST202, the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22 and the force acting on the second valve body 34 by the internal pressure Pc of the gas storage chamber 26. The Fc and the urging force Fs of the urging member 40 are F b < F c + Fs.

The internal pressure Pb exceeds the permissible pressure Pa and starts blowing at time t3 and reaches the pressure P2. At time t3, the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22, the force Fc acting on the second valve body 34 by the internal pressure Pc of the gas storage chamber 26, and the urging member 40 are attached. The power Fs is F b ≧ F c + Fs. When the internal pressure Pb starts to blow and reaches the pressure P2, the first valve body 32 and the second valve body 34 move in the opening direction as shown in step ST204 of FIG.

The force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22 opposes the force Fc acting on the second valve body 34 by the internal pressure Pc of the gas storage chamber 26 and the urging force Fs of the urging member 40. Then, the first valve body 32 is opened. That is, the first valve body 32 moves in the direction of the relief flow path 24 by the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22. As a result, the first valve body 32 opens between the gas flow path 22 and the relief flow path 24. When the first valve body 32 is opened and the gas flow path 22 and the relief flow path 24 communicate with each other, the refrigerant gas in the gas flow path 22 starts to be discharged to the outside of the device through the relief flow path 24. From time t3 to t4 including step ST204, the internal pressure Pb of the gas flow path 22 stops rising. Further, after the time t4, the internal pressure Pb of the gas flow path 22 gradually decreases.

The force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22 opposes the force Fc acting on the second valve body 34 by the internal pressure Pc of the gas storage chamber 26 and the urging force Fs of the urging member 40. Then, the second valve body 34 is opened. That is, the second valve body 34 is interlocked with the first valve body 32 which is released in the direction of the flow path 24 by the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22, and is linked to the gas storage chamber. Move inside 26. As a result, the second valve body 34 opens between the gas storage chamber 26 and the relief flow path 24. When the second valve body 34 is opened and the gas storage chamber 26 and the relief flow path 24 communicate with each other, the gas in the gas storage chamber 26 starts to be released to the outside of the device through the relief flow path 24.

The internal pressure Pb reaches the stop pressure P3 at time t5. The blow-off pressure P3 is the same as the operating pressure P1 in the embodiment. From time t3 to time t5 including step ST204 and step ST206 described later, the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22 and the internal pressure Pc of the gas storage chamber 26 make the second valve body. The force Fc acting on the 34 and the urging force Fs of the urging member 40 are F b = F c + Fs. At time t5, the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22, the force Fc acting on the second valve body 34 by the internal pressure Pc of the gas storage chamber 26, and the urging member 40 are attached. The force Fs is F b ≦ F c + Fs. As described above, when the internal pressure Pc of the gas storage chamber 26 is reduced to the same level as the external pressure P0 of the device, F b ≦ Fs at time t5. When the internal pressure Pb reaches the blow-off pressure P3, the first valve body 32 and the second valve body 34 are closed as shown in step ST208 of FIG.

In this way, when the second valve body 34 of the safety valve 10 is opened, the internal pressure Pc of the gas storage chamber 26 is reduced to the same level as the external pressure P0 of the device, so that the first valve body 32 and the second valve body 34 are The internal pressure Pb of the gas flow path 22 with respect to the urging force Fs of the urging member 40 closes according to the value of the force Fb acting on the first valve body 32 . That is, the urging force Fs of the urging member 40 is set based on the blow-off pressure P3 in which the first valve body 32 and the second valve body 34 are closed.

Further, in the safety valve 10, when the first valve body 32 and the second valve body 34 are closed, the first valve body 32 and the second valve body 34 have the urging force Fs of the urging member 40 and the gas storage chamber. It is released according to the value of the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22 with respect to the sum of the forces Fc acting on the second valve body 34 by the internal pressure Pc of 26. That is, the internal pressure Pc of the gas storage chamber 26 before the safety valve 10 is activated is set based on the differential pressure between the blowing start pressure P2 and the blowing stop pressure P3.

As described above, the safety valve 10 of the embodiment includes a fluid storage chamber (gas storage chamber 26), a first valve body 32, a second valve body 34, and an urging member 40. The fluid storage chamber communicates with the outside of the device. The fluid storage chamber can seal the fluid under an internal pressure Pc that is at least higher than the external pressure of the device. The first valve body 32 can open and close between the gas flow path 22 communicating with the inside of the device and the outside of the device. The second valve body 34 is interlocked with the first valve body 32, and can open and close the space between the fluid storage chamber and the outside of the device. The urging member 40 urges the first valve body 32 or the second valve body 34 in a direction in which the second valve body 34 closes between the fluid storage chamber and the outside of the device. In the safety valve 10, the force Fb acting on the first valve body 32 by the internal pressure Pb of the gas flow path 22 acts on the second valve body 34 by the internal pressure Pc of the fluid storage chamber, and the force Fc acts on the second valve body 34 and the urging force Fs of the urging member 40. When the first valve body 32 is opened against it, the second valve body 34 is opened.

As a result, when the first valve body 32 and the second valve body 34 are closed , the force Fb acting on the first valve body 32 due to the internal pressure Pb of the gas flow path 22 is the urging force Fs of the urging member 40. The first valve body 32 and the second valve body 34 are opened by exceeding the sum of the forces Fc acting on the second valve body 34 by the internal pressure Pc of the fluid storage chamber (gas storage chamber 26). When the second valve body 34 is opened, the internal pressure Pc of the fluid storage chamber is reduced to the same level as the external pressure of the device. Therefore, when the first valve body 32 and the second valve body 34 are open , the force Fb acting on the first valve body 32 due to the internal pressure Pb of the gas flow path 22 exerts the urging force Fs of the urging member 40. By lowering, the first valve body 32 and the second valve body 34 are closed. That is, the blow-off pressure P3 can be adjusted by setting the urging force Fs of the urging member 40. Further, the differential pressure between the blowing start pressure P2 and the blowing stop pressure P3 can be adjusted by setting the internal pressure Pc of the fluid storage chamber before operation. As a result, the blowing start pressure P2 and the blowing stop pressure P3 can be set individually. Further, since it can be controlled without using electric power, it can be operated even in the event of a power failure.

Further, in the embodiment, the superconducting accelerator 100 is provided with a safety valve 10. As a result, when the first valve body 32 and the second valve body 34 are closed , the force Fb acting on the first valve body 32 due to the internal pressure Pb of the gas flow path 22 is the urging force Fs of the urging member 40. The first valve body 32 and the second valve body 34 are opened by exceeding the sum of the forces Fc acting on the second valve body 34 by the internal pressure Pc of the fluid storage chamber (gas storage chamber 26). When the second valve body 34 is opened, the internal pressure Pc of the fluid storage chamber decreases to the same level as the external pressure of the superconducting accelerator 100. Therefore, when the first valve body 32 and the second valve body 34 are open , the force Fb acting on the first valve body 32 due to the internal pressure Pb of the gas flow path 22 exerts the urging force Fs of the urging member 40. By lowering, the first valve body 32 and the second valve body 34 are closed. That is, the blow-off pressure P3 can be adjusted by setting the urging force Fs of the urging member 40. Further, the differential pressure between the blowing start pressure P2 and the blowing stop pressure P3 can be adjusted by setting the internal pressure Pc of the fluid storage chamber before operation. As a result, the blowing start pressure P2 and the blowing stop pressure P3 can be set individually. Further, since it can be controlled without using electric power, it can be operated even in the event of a power failure.

Claims (6)

A fluid storage chamber that communicates with the outside of the device and can seal the fluid under an internal pressure that is at least higher than the pressure outside the device.
A first valve body that can open and close between the gas flow path communicating with the inside of the device and the outside of the device,
A second valve body that is interlocked with the first valve body and can open and close between the fluid storage chamber and the outside of the device.
An urging member that urges the first valve body or the second valve body in a direction in which the second valve body closes between the fluid storage chamber and the outside of the device.
With
A safety valve in which the second valve body is opened when the internal pressure of the gas flow path opens the first valve body against the internal pressure of the fluid storage chamber and the urging force of the urging member. A fluid supply path connected to the fluid storage chamber to supply the fluid to the fluid storage chamber,
A shutoff valve that can open and close the fluid supply path,
The safety valve according to claim 1. When the internal pressure of the fluid storage chamber is equal to or lower than a predetermined pressure in the state where the second valve body is closed, the closing valve is opened to supply the fluid to the fluid storage chamber via the fluid supply path. Equipped with a control unit
The safety valve according to claim 2. The fluid supply path is connected to the gas flow path and is supplied from the gas flow path as a fluid for storing gas in the fluid storage chamber.
The safety valve according to claim 2 or 3. A relief flow path that communicates with the outside of the device and communicates with the gas flow path and the fluid storage chamber in a state where the first valve body and the second valve body are open is provided.
The safety valve according to any one of claims 1 to 4. A superconducting accelerator provided with the safety valve according to any one of claims 1 to 5.

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