Fluid control device, fluid pressure supply device, and fluid control method

Abstract

A fluid control device (10) is provided with: a pressure adjustment valve control unit (76) that controls a pressure adjustment valve when it is determined that the flow rate (F) of a fluid continues to be equal to or less than a threshold (FT) for a first predetermined time (TM1) or more and a standby mode is permitted from an operator, and that the flow rate (F) of the fluid continues to be equal to or less than a threshold (FT) for a second predetermined time (TM1); the fluid is output from the pressure adjusting valve (50) at a second pressure (P2) lower than the first pressure (P1); and a shut-off valve control unit (80) that, when a second predetermined time (TM2) has elapsed in the standby mode, controls the shut-off valve (54) such that the supply of the fluid to the external device (42) is shut off.

Description

Technical Field

[0001] The present invention relates to a fluid control device, a fluid pressure supply device and a fluid control method. Background Art

[0002] In the specification of U.S. Patent Application Publication No. 2019 / 257329, the following fluid control device is disclosed: if the flow rate of air becomes below a threshold value in the working mode, it is transferred to the holding mode. In the holding mode, air is supplied to the external fluid device at a lower pressure than in the working mode.

[0003] According to the fluid control device disclosed in the specification of U.S. Patent Application Publication No. 2019 / 257329, fluid is supplied even when fluid supply to an external device is not required. Therefore, there is a technical problem of wastefully consuming fluid. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned technical problems.

[0005] A first aspect of the present invention provides a fluid control device, a control valve assembly, the valve assembly comprising: a pressure regulating valve, the pressure regulating valve being capable of regulating the pressure of a fluid supplied from a fluid supply source; and a shut-off valve, the shut-off valve being capable of shutting off the supply of the fluid output from the pressure regulating valve to an external device, wherein the fluid control device comprises: a flow acquisition unit, the flow acquisition unit acquiring the flow rate of the fluid passing through the valve assembly from a flow meter; a flow determination unit, the flow determination unit determining whether the acquired flow rate is continuously below a threshold value for more than a first specified time; and a pressure regulating valve control unit, the pressure regulating valve control unit determining whether the flow rate is continuously below a threshold value for more than a first specified time from the fluid supply source at a first pressure. When the flow rate obtained in the operation mode in which the pressure regulating valve outputs the fluid continues to be below the threshold value for more than the first specified time and the standby mode is permitted by the operator, the pressure regulating valve is controlled so that the fluid is output from the pressure regulating valve at a second pressure lower than the first pressure, thereby switching the operation mode to the standby mode; and a cut-off valve control unit that controls the cut-off valve when a second specified time has passed in the standby mode so that the supply of the fluid output from the pressure regulating valve to the external device is cut off, thereby switching the standby mode to the isolation mode.

[0006] A second aspect of the present invention provides a fluid pressure supply device including the fluid control device of the first aspect and the valve assembly.

[0007] A third aspect of the present invention provides a fluid control method, a control valve assembly, the valve assembly comprising: a pressure regulating valve, the pressure regulating valve being capable of regulating the pressure of a fluid supplied from a fluid supply source; and a cut-off valve, the cut-off valve being capable of cutting off the supply of the fluid output from the pressure regulating valve to an external device, wherein the fluid control method comprises: a flow acquisition step, acquiring the flow rate of the fluid passing through the valve assembly from a flow meter; a flow determination step, determining whether the acquired flow rate is continuously below a threshold value for more than a first specified time; a first pressure regulating valve control step, upon determining that the fluid is output from the pressure regulating valve at a first pressure, The process comprises: controlling the pressure regulating valve so that the fluid is output from the pressure regulating valve at a second pressure lower than the first pressure, thereby switching the operation mode to the standby mode, when the flow rate obtained in the operation mode of outputting the fluid continues to be below the threshold value for more than the first specified time and the standby mode is permitted by the operator; and a first cut-off valve control process, when a second specified time has passed in the standby mode, controlling the cut-off valve so that the supply of the fluid output from the pressure regulating valve to the external device is cut off, thereby switching the standby mode to the isolation mode.

[0008] According to the present invention, it is possible to save fluid supplied to external devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a diagram showing the structure of a fluid pressure supply device including a fluid control device and a valve assembly in one embodiment.

[0010] Figure 2 is a circuit diagram of the valve assembly in operating mode and in standby mode.

[0011] Figure 3 is a circuit diagram of the valve assembly in isolation mode.

[0012] Figure 4 It is a timing chart illustrating changes in the flow rate and pressure of the fluid supplied to the external device.

[0013] Figure 5 This is a flowchart showing the processing procedure of the fluid control process performed by the fluid control device when the operation mode is switched to the standby mode.

[0014] Figure 6 This is a flowchart showing the processing steps of the fluid control process performed by the fluid control device when the standby mode is switched to the operating mode or the isolation mode.

[0015] Figure 7The flowchart shows the processing steps of the fluid control processing performed by the fluid control device when the isolation mode is switched to the operation mode.

[0016] Figure 8 is a circuit diagram of the valve assembly in operating mode.

[0017] Fig. 9 is a circuit diagram of the valve assembly in standby mode.

[0018] Fig.10 is a circuit diagram of the valve assembly in isolation mode.

[0019] Fig.11 This is a flowchart showing the processing steps of the fluid control process performed by the fluid control device when the standby mode is switched to the operating mode or the isolation mode.

[0020] Fig.12 The flowchart shows the processing steps of the fluid control processing performed by the fluid control device when the isolation mode is switched to the operation mode.

[0021] Fig.13 This is a flowchart for explaining the processing procedure of the fluid control process performed by the fluid control device when there is an instruction to prohibit the transition to the isolation mode.

[0022] Fig.14 This is a flowchart for explaining the processing procedure of the fluid control processing performed by the fluid control device when the isolation mode is switched to the standby mode.

[0023] Fig.15 This is a flowchart for explaining the processing procedure of the fluid control process performed by the fluid control device when there is an instruction to prohibit the transition to the standby mode. DETAILED DESCRIPTION

[0024] Figure 1 1 is a diagram showing the structure of a fluid pressure supply device 30 including a fluid control device 10 and a valve assembly 20 in one embodiment. The fluid control device 10 controls the valve assembly 20. A fluid (e.g., air) supplied from a fluid supply source 40 flows into an inlet of the valve assembly 20 through a pipe. The fluid flowing into the inlet of the valve assembly 20 passes through the valve assembly and flows out from the outlet of the valve assembly 20. The fluid flowing out from the outlet of the valve assembly 20 is supplied to an external device 42 through a pipe. The valve assembly 20 includes a pressure regulating valve 50, a flow meter 52, and a shutoff valve 54.

[0025] The pressure regulating valve 50 is capable of regulating the pressure of the fluid supplied from the fluid supply source 40. In the present embodiment, the pressure regulating valve 50 is a proportional control valve that regulates the pressure of the fluid according to an electrical signal. The pressure regulating valve 50 includes a main valve and a pilot valve that regulates the opening of the main valve. The fluid supplied from the fluid supply source 40 flows into the inlet port of the pressure regulating valve 50. The inlet port of the pressure regulating valve 50 is connected to the inlet port of the valve assembly 20 described above. In addition, the inlet port of the pressure regulating valve 50 may also be the inlet port of the valve assembly 20 described above.

[0026] The pressure of the fluid flowing into the inlet port of the pressure regulating valve 50 is adjusted according to the opening of the main valve. The fluid whose pressure is adjusted flows out from the outlet port of the pressure regulating valve 50. The fluid output from the pressure regulating valve 50 is directed toward the shutoff valve 54.

[0027] The flow meter 52 measures the flow rate F of the fluid passing through the valve assembly 20 . In the present embodiment, the flow meter 52 measures the flow rate F of the fluid output from the pressure regulating valve 50 toward the shutoff valve 54 .

[0028] When the shutoff valve 54 is open, the fluid output from the pressure regulating valve 50 is supplied to the external device 42. The shutoff valve 54 includes a main valve and a pilot valve for opening and closing the main valve. The shutoff valve 54 shuts off the supply of the fluid output from the pressure regulating valve 50 to the external device 42 by closing the main valve.

[0029] The fluid output from the pressure regulating valve 50 flows into the inlet port of the shutoff valve 54. When the main valve of the shutoff valve 54 is open, the fluid flowing into the inlet port of the shutoff valve 54 flows out from the outlet port of the shutoff valve 54. The outlet port of the shutoff valve 54 is connected to the outlet port of the valve assembly 20 described above. The fluid flowing out from the outlet port of the shutoff valve 54 is directed toward the external device 42. In this way, the fluid output from the pressure regulating valve 50 is supplied to the external device 42. In addition, the outlet port of the shutoff valve 54 may also be the outlet port of the valve assembly 20 described above.

[0030] When the main valve of the shutoff valve 54 is closed, the fluid flowing into the inlet port of the shutoff valve 54 does not flow out from the outlet port of the shutoff valve 54. That is, when the main valve of the shutoff valve 54 is closed, the supply of the fluid output from the pressure regulating valve 50 to the external device 42 is cut off.

[0031] The fluid control device 10 has a processing circuit 60 and a storage device 62. The processing circuit 60 includes a processor such as a CPU or a GPU. The storage device 62 includes a volatile memory such as a RAM and a non-volatile memory such as a ROM or a flash memory. The volatile memory is used as a working memory of the processor. The non-volatile memory stores programs executed by the processor and other necessary data.

[0032] The processing circuit 60 includes an interface unit 70, a timing unit 72, a flow rate determination unit 74, a pressure regulating valve control unit 76, a flow rate acquisition unit 78, and a shut-off valve control unit 80. The interface unit 70, the timing unit 72, the flow rate determination unit 74, the pressure regulating valve control unit 76, the flow rate acquisition unit 78, and the shut-off valve control unit 80 are implemented by the processing circuit 60 executing a program stored in the storage device 62. At least a part of the interface unit 70, the timing unit 72, the flow rate determination unit 74, the pressure regulating valve control unit 76, the flow rate acquisition unit 78, and the shut-off valve control unit 80 may also be implemented by an integrated circuit such as an ASIC or an FPGA, or an electronic circuit including discrete devices.

[0033] The interface unit 70 performs two-way communication with the operator terminal 90 via wireless communication. The interface unit 70 may also perform two-way communication with the operator terminal 90 via wired communication. The interface unit 70 obtains the operator's instruction from the operator terminal 90. The interface unit 70 may also obtain the operator's instruction from an operating device such as a button or a slide switch (not shown) provided in the fluid pressure supply device 30. In addition, the operator terminal 90 is, for example, a PC (personal computer) or a PLC (Programmable Logic Controller).

[0034] The timer unit 72 includes a clock circuit or a timing circuit and measures time. The timer unit 72 measures a first predetermined time TM1 and a second predetermined time TM2 described below based on time information from the clock circuit or the timing circuit.

[0035] The flow acquisition unit 78 acquires the flow rate F measured by the flow measurement device 52. For example, the flow rate F of the fluid may decrease due to the stop of the external device 42. The flow determination unit 74 determines whether the flow rate F acquired by the flow acquisition unit 78 is continuously below the threshold value FT for a first predetermined time period TM1 or longer.

[0036] The pressure regulating valve control unit 76 controls the pressure regulating valve 50 using an electrical signal. The pilot valve of the pressure regulating valve 50 is actuated according to the electrical signal output from the pressure regulating valve control unit 76. The opening of the main valve of the pressure regulating valve 50 is adjusted to various levels by the actuation of the pilot valve of the pressure regulating valve 50. When the opening of the main valve is zero, the pressure regulating valve 50 is in a closed state.

[0037] The shutoff valve control unit 80 uses an electric signal to control the shutoff valve 54. The pilot valve of the shutoff valve 54 is actuated by the electric signal output from the shutoff valve control unit 80. The main valve of the shutoff valve 54 is opened and closed by the actuation of the pilot valve of the shutoff valve 54.

[0038] Figure 22 is a circuit diagram of the valve assembly 20 in the operation mode and the standby mode. The pressure regulating valve control unit 76 controls the pressure regulating valve 50 to adjust the pressure of the fluid supplied from the fluid supply source 40 to the first pressure P1 for the use of the fluid in the external device 42. The mode in which the fluid is output from the pressure regulating valve 50 at the first pressure P1 is referred to as the operation mode.

[0039] In the operation mode, the main valve of the shutoff valve 54 is open. In the operation mode, the fluid output from the pressure regulating valve 50 at the first pressure P1 flows out of the valve assembly 20 and is supplied to the external device 42 .

[0040] In the operation mode, the interface unit 70 acquires an instruction C1 indicating that the operator has permitted the standby mode. In the operation mode, the flow rate determination unit 74 determines that the flow rate F of the fluid measured by the flow meter 52 has been continuously below the threshold value FT for at least the first predetermined time TM1.

[0041] In this case, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the fluid is discharged from the pressure regulating valve 50 at the second pressure P2 which is lower than the first pressure P1. That is, when the flow rate F of the fluid continues to be less than the threshold value FT for more than the first predetermined time TM1 and the operator instructs the instruction C1, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the fluid at the second pressure P2 is discharged from the pressure regulating valve 50. The mode in which the fluid is discharged from the pressure regulating valve 50 at the second pressure P2 is referred to as the standby mode. That is, the pressure regulating valve control unit 76 switches the operation mode to the standby mode.

[0042] In the standby mode, the external device 42 may be stopped, and the necessity of supplying the fluid of the first pressure P1 is low, and the fluid of the second pressure P2 lower than the first pressure P1 is output from the pressure regulating valve 50. The pressure regulating valve control unit 76 reduces the opening of the main valve of the pressure regulating valve 50 through the pilot valve of the pressure regulating valve 50 so that the pressure P is reduced from the first pressure P1 to the second pressure P2. The main valve of the shut-off valve 54 is maintained in an open state. In the standby mode, the fluid is supplied to the external device 42 while the pressure P of the fluid is adjusted to the second pressure P2. In the standby mode, the waste of fluid consumption is suppressed compared with the operating mode.

[0043] Figure 3 2 is a circuit diagram of the valve assembly 20 in the isolation mode. When the second predetermined time TM2 has passed in the standby mode, the shutoff valve control unit 80 controls the shutoff valve 54 so as to shut off the supply of the fluid output from the pressure regulating valve 50 to the external device 42. Specifically, the shutoff valve control unit 80 closes the main valve of the shutoff valve 54 through the pilot valve of the shutoff valve 54. The mode of shutting off the supply of the fluid to the external device 42 is called the isolation mode. That is, the shutoff valve control unit 80 switches the standby mode to the isolation mode.

[0044] In the isolation mode, the shutoff valve control unit 80 shuts off the supply of the fluid to the external device 42 and opens the outlet port of the shutoff valve 54 to the atmosphere. In other words, the outlet port of the valve assembly 20 is opened to the atmosphere.

[0045] In the isolation mode, the pressure regulating valve control unit 76 preferably makes the opening of the main valve of the pressure regulating valve 50 zero via the pilot valve of the pressure regulating valve 50. That is, the pressure regulating valve control unit 76 preferably closes the main valve of the pressure regulating valve 50.

[0046] In addition, the pressure regulating valve 50 has a check valve 50c. In any of the operation mode, the standby mode, and the isolation mode, when the fluid pressure supply device 30 is stopped, the fluid supply from the fluid supply source 40 is cut off. When the inlet port of the pressure regulating valve 50 becomes the atmospheric pressure PA, the check valve 50c allows the fluid flowing out of the outlet port to flow from the outlet port to the inlet port of the pressure regulating valve 50. Therefore, when the fluid pressure supply device 30 is stopped for maintenance inspection of the valve assembly 20, for example, the safety of the inspection operator can be ensured.

[0047] In addition, in the case of emergency stop of power supply to the fluid pressure supply device 30, the valve assembly 20 may be in a normally closed state. Figure 3 In the state shown, the main valve of the cutoff valve 54 is in a closed state. In this case, the fluid in the valve assembly 20 can be discharged, and the safety of the inspection operator can be ensured.

[0048] In the case of an emergency stop of the power supply to the fluid pressure supply device 30, the valve assembly 20 may also be in a normally open state. Figure 2 In the state shown, the main valve of the pressure regulating valve 50 and the main valve of the shutoff valve 54 are both in the open state. In this case, the fluid supply to the external device 42 can be continued.

[0049] Figure 4 4 is a timing chart illustrating changes in the flow rate F and pressure P of the fluid supplied to the external device 42. Figure 4 FIG. 4 shows how the flow rate F of the fluid supplied to the external device 42 changes as the time progresses from time T0 to time T9 and after T9. Figure 4 2 shows how the pressure P of the fluid supplied to the external device 42 changes as the time progresses from the time T0 to the time T9 and after T9.

[0050] exist Figure 4At time T0 of the example shown, the valve assembly 20 operates in the operation mode. At time T0, a fluid of a first flow rate F1 is supplied to the external device 42 at a first pressure P1. Then, when the consumption of the fluid in the external device 42 stops due to the stop of the external device 42, the flow rate F of the fluid begins to decrease. The time when the flow rate F of the fluid begins to decrease is set as time T1. Then, the flow rate F of the fluid reaches the threshold value FT. The time when the flow rate F of the fluid reaches the threshold value FT is set as time T3.

[0051] In addition, the interface unit 70 obtains the operator's instruction C1 before time T3. For example, the interface unit 70 obtains the instruction C1 at time T2, which is later than time T1 and earlier than time T3. The timing unit 72 starts timing from time T3 when the flow rate F reaches the threshold value FT.

[0052] exist Figure 4 In the example shown, after time T3, the flow rate F is also below the threshold value FT. The time when the timing unit 72 starts timing at time T3 and the first prescribed time TM1 has passed is set to time T4. In addition, it is assumed that at time T4, the permission for the operator to transfer to the standby mode is not cancelled (the transfer to the standby mode is not prohibited). In this case, at time T4, the flow rate determination unit 74 determines that the flow rate F continues to be below the threshold value FT for more than the first prescribed time TM1. The process of performing this determination process is called a flow rate determination process. At time T4, the pressure regulating valve control unit 76 switches the operation mode to the standby mode.

[0053] The valve assembly 20 that was operating in the operation mode before reaching the time T4 operates in the standby mode from the time T4 to the time T7. At the time T4, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 to close the main valve of the pressure regulating valve 50. At the time T4, the flow rate F of the fluid is zero. At the time T4, the timing unit 72 starts timing again.

[0054] From time T4 to time T5, the main valve of the pressure regulating valve 50 temporarily maintains a closed state. During this period, the fluid is gradually consumed downstream of the valve assembly 20. For example, when the fluid is air, the air is consumed by purging the gas in the pipe connecting the outlet of the valve assembly 20 and the external device 42. Figure 4 As shown, from time T4, the pressure P of the fluid gradually decreases. The time when the pressure P of the fluid decreases from the first pressure P1 to the second pressure P2 is set to time T5.

[0055] At time T5, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the fluid is output at the second pressure P2 from the pressure regulating valve 50. The process of performing this control process is referred to as a first pressure regulating valve control process.

[0056] At time T5, the flow rate F of the fluid starts to increase. The pressure P of the fluid maintains the second pressure P2. The time when the flow rate F of the fluid reaches the second flow rate F2 is set to time T6. After time T6, the fluid of the second flow rate F2 is supplied to the external device 42 at the second pressure P2.

[0057] In the standby mode, the timing unit 72 starts timing at time T4 and the second predetermined time TM2 passes. The time when the second predetermined time TM2 passes is set to time T7. At time T7, the shutoff valve control unit 80 switches the standby mode to the isolation mode. The valve assembly 20 that operates in the standby mode from time T4 to time T7 operates in the isolation mode after time T7.

[0058] At time T7, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 to close the main valve of the pressure regulating valve 50. At time T7, the shutoff valve control unit 80 controls the shutoff valve 54 to close the main valve of the shutoff valve 54. The process of performing this control process is referred to as a first shutoff valve control process. As a result, the supply of the fluid output from the pressure regulating valve 50 to the external device 42 is shut off.

[0059] In addition, the pressure regulating valve control unit 76 may control the pressure regulating valve 50 after the shutoff valve control unit 80 controls the shutoff valve 54. At time T7, the flow rate F of the fluid is zero. At time T7, the shutoff valve control unit 80 opens the outlet port of the shutoff valve 54 (the outlet port of the valve assembly 20) to the atmosphere. At time T7, the pressure of the outlet port of the valve assembly 20 is reduced to a pressure equal to the atmospheric pressure PA.

[0060] In the isolation mode, the interface unit 70 receives the instruction C2 from the operator at time T8. The instruction C2 indicates that the operator has instructed to return to the operation mode. At time T8, the pressure regulating valve control unit 76 switches the isolation mode to the operation mode.

[0061] The valve assembly 20 that has been operating in the isolation mode from time T7 to time T8 operates in the operation mode after time T8. From time T8 to time T9, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the pressure P of the fluid output from the pressure regulating valve 50 increases slowly from the atmospheric pressure PA to the first pressure P1 at an increase rate determined according to time. In this way, the so-called soft start function is realized. The soft start function prevents the pressure P of the fluid output from the pressure regulating valve 50 from rising sharply from the atmospheric pressure PA to the first pressure P1. The process of performing this control process is called the second pressure regulating valve control process.

[0062] At time T8, the shutoff valve control unit 80 controls the shutoff valve 54 so that the fluid output from the pressure regulating valve 50 is supplied to the external device 42. The process of performing this control process is referred to as a second shutoff valve control process. From time T8 to time T9, the flow rate F and pressure P of the fluid gradually increase. After time T9, the fluid of the first flow rate F1 is supplied to the external device 42 at the first pressure P1.

[0063] Figure 5 1 is a flowchart showing the processing steps of the fluid control process performed by the fluid control device 10 when the operation mode is switched to the standby mode. This processing step is performed by the processing circuit 60 of the fluid control device 10 executing the program stored in the storage device 62. When starting this processing step, the valve assembly 20 operates in the operation mode. In the operation mode, the fluid of the first flow rate F1 is supplied to the external device 42 at the first pressure P1.

[0064] When this processing procedure is started, in step S10, the flow rate acquisition unit 78 acquires the flow rate F measured by the flow rate measurement device 52 from the flow rate measurement device 52. The process of performing the process of step S10 is referred to as a flow rate acquisition process.

[0065] In step S12, the flow rate determination unit 74 determines whether the flow rate F acquired by the flow rate acquisition unit 78 is less than the threshold value FT. If "yes" in step S12, the process proceeds to step S14. If "no" in step S12, the process returns to step S10.

[0066] In step S14, the flow rate determination unit 74 determines whether the flow rate F continues to be less than the threshold value FT for more than the first predetermined time TM1 measured by the timing unit 72. If it is "yes" in step S14, this process step proceeds to step S16. If it is "no" in step S14, this process step returns to step S10. The process of performing the processing of steps S12 and S14 corresponds to the above-mentioned flow rate determination process.

[0067] In step S16, the pressure regulating valve control unit 76 determines whether the interface unit 70 has obtained the operator's instruction C1. Instruction C1 indicates that the standby mode is permitted by the operator. In the case of "Yes" in step S16, this processing step proceeds to step S18. "No" in step S16 means that the transition to the standby mode is prohibited. In this case, the operator has not permitted the transition to the standby mode, or the operator has canceled the permission for the transition to the standby mode. In the case of "No" in step S16, this processing step returns to step S10.

[0068] In step S18, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the fluid is output from the pressure regulating valve 50 at the second pressure P2. The process of performing the processing of step S18 corresponds to the first pressure regulating valve control process described above. If the processing of step S18 is completed, this processing step ends. The valve assembly 20 operates in the standby mode.

[0069] Figure 6 1 is a flowchart showing the processing steps of the fluid control process performed by the fluid control device 10 when the standby mode is switched to the operating mode or the isolation mode. This processing step is performed by the processing circuit 60 of the fluid control device 10 executing the program stored in the storage device 62. When this processing step is started, the valve assembly 20 operates in the standby mode. In the standby mode, the fluid of the second flow rate F2 is supplied to the external device 42 at the second pressure P2. When this processing step is started, in step S30, the timer 72 starts measuring the second specified time TM2.

[0070] In step S32, the pressure regulating valve control unit 76 determines whether the interface unit 70 has received the instruction C3 from the operator. The instruction C3 indicates that the transition to the standby mode is prohibited. If the instruction C3 is received in the standby mode, the instruction C3 corresponds to Figure 5 In the case where the operator cancels the permission to shift to the standby mode in step S16. In the case of "Yes" in step S32, the present process proceeds to step S34. In the case of "No" in step S32, the present process proceeds to step S40.

[0071] If YES in step S32 , in step S34 , the pressure regulating valve control unit 76 controls the pressure regulating valve 50 to increase the pressure P of the fluid output from the pressure regulating valve 50 from the second pressure P2 to the first pressure P1 at an increasing rate determined over time.

[0072] In step S36, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the fluid is output at the first pressure P1 from the pressure regulating valve 50. When the process of step S36 is completed, this process step ends. The valve assembly 20 operates in the operation mode.

[0073] If the answer is "No" in step S32, the timer 72 determines whether the second predetermined time TM2 has elapsed in step S40. If the answer is "Yes" in step S40, the process proceeds to step S42. If the answer is "No" in step S40, the process returns to step S32.

[0074] In step S42 , the pressure regulating valve control unit 76 controls the pressure regulating valve 50 to close the pressure regulating valve 50 .

[0075] In step S44, the shut-off valve control unit 80 controls the shut-off valve 54 to close the main valve of the shut-off valve 54. As a result, the supply of the fluid output from the pressure regulating valve 50 to the external device 42 is cut off. The process of performing the processing of step S44 corresponds to the first shut-off valve control process described above. Since the outlet of the valve assembly 20 is open to the atmosphere, the pressure becomes equal to the atmospheric pressure PA. If the processing of step S44 is completed, this processing step ends. The valve assembly 20 operates in the isolation mode.

[0076] Figure 7 1 is a flowchart showing the processing steps of the fluid control process performed by the fluid control device 10 when the isolation mode is switched to the operation mode. This processing step is performed by the processing circuit 60 of the fluid control device 10 executing the program stored in the storage device 62. When starting this processing step, the valve assembly 20 operates in the isolation mode. In the isolation mode, the supply of the fluid output from the pressure regulating valve 50 to the external device 42 is cut off. The pressure of the outflow port of the valve assembly 20 is equal to the atmospheric pressure PA.

[0077] When this processing step is started, in step S60, the shutoff valve control unit 80 determines whether the interface unit 70 has obtained the operator's instruction C2. Instruction C2 indicates that the operator has instructed to return to the operating mode. In the case of "yes" in step S60, this processing step proceeds to step S62. In the case of "no" in step S60, this processing step repeats step S60.

[0078] In step S62, the shutoff valve control unit 80 controls the shutoff valve 54 to open the shutoff valve 54. If the pressure regulating valve 50 is opened in the subsequent process, the fluid output from the pressure regulating valve 50 is supplied to the external device 42. The process of performing the process of step S62 corresponds to the second shutoff valve control process described above.

[0079] In step S64, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the pressure P of the fluid output from the pressure regulating valve 50 increases from the atmospheric pressure PA to the first pressure P1 at an increase rate determined according to time. In step S66, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the fluid is output from the pressure regulating valve 50 at the first pressure P1. The process of performing the processing of steps S64 and S66 corresponds to the second pressure regulating valve control process described above. If the processing of step S66 is completed, this processing step ends. The valve assembly 20 operates in the operation mode.

[0080] [Modifications]

[0081] The above-mentioned embodiment may be modified as follows.

[0082] (Variant 1)

[0083] In the above-mentioned embodiment, the pressure regulating valve 50 of the valve assembly 20 is a proportional control valve that adjusts the pressure of the fluid according to an electrical signal. The valve assembly 20A controlled by the fluid control device 10 of the modification 1 includes: a pressure regulating valve 50A that outputs the fluid at two pressures according to an electrical signal corresponding to on and off; a flow meter 52; a throttle valve 100; a switching valve 102; and a shut-off valve 54.

[0084] Figure 8 1 is a circuit diagram of the valve assembly 20A in the operation mode. The throttle valve 100 and the switching valve 102 are arranged between the pressure regulating valve 50A and the shut-off valve 54. The pressure regulating valve 50A includes a main valve 50m and a pilot valve 50p for adjusting the opening of the main valve 50m. The fluid supplied from the fluid supply source 40 at the first pressure P1 flows into the inlet port of the pressure regulating valve 50A.

[0085] In this modified example, when the electric signal output from the pressure regulating valve control unit 76 of the fluid control device 10 to the pilot valve 50p of the pressure regulating valve 50A is turned off, the pressure regulating valve 50A outputs the fluid while substantially maintaining the first pressure P1 of the fluid supplied from the fluid supply source 40. When the electric signal output from the pressure regulating valve control unit 76 to the pilot valve 50p of the pressure regulating valve 50A is turned on, the pressure regulating valve 50A adjusts the first pressure P1 of the fluid supplied from the fluid supply source 40 to the second pressure P2, and outputs the fluid.

[0086] like Figure 8 As shown, when the valve assembly 20A operates in the operation mode, the electric signal output from the pressure regulating valve control unit 76 to the pilot valve 50p of the pressure regulating valve 50A is turned off. The pressure regulating valve 50A outputs fluid at the first pressure P1. The shutoff valve control unit 80 controls the shutoff valve 54 to open the main valve of the shutoff valve 54.

[0087] The first pressure P1 of the fluid output from the pressure regulating valve 50A presses the first pressure receiving surface 102a of the switching valve 102. The first pressure P1 acts in a direction of pressing down the position of the switching valve 102 with respect to the first pressing force S1 of the first pressure receiving surface 102a. The first pressure P1 of the fluid flowing out from the outlet port of the shutoff valve 54 to the external device 42 presses the second pressure receiving surface 102b of the switching valve 102. The first pressure P1 acts in a direction of pushing up the position of the switching valve 102 with respect to the second pressing force S2 of the second pressure receiving surface 102b.

[0088] The area of ​​the first pressure-receiving surface 102a of the switching valve 102 is smaller than the area of ​​the second pressure-receiving surface 102b. In this case, the first pressing force S1 applied to the first pressure-receiving surface 102a is smaller than the second pressing force S2 applied to the second pressure-receiving surface 102b. Figure 8 As shown, the position of the switching valve 102 is pushed upward. The switching valve 102 allows the fluid output from the pressure regulating valve 50A to flow to the shutoff valve 54 without passing through the throttle valve 100. Thus, in the operation mode, the fluid of the first pressure P1 output from the pressure regulating valve 50A is supplied to the external device 42.

[0089] Fig. 9 2 is a circuit diagram of the valve assembly 20A in the standby mode. When the valve assembly 20A is operating in the standby mode, the electric signal output from the pressure regulating valve control unit 76 to the pilot valve 50p of the pressure regulating valve 50A is turned on. The pressure regulating valve 50A outputs the fluid at the second pressure P2. The main valve of the shut-off valve 54 remains in an open state.

[0090] The third pressing force S3 of the second pressure P2 on the first pressure-receiving surface 102a is smaller than the fourth pressing force S4 of the second pressure P2 on the second pressure-receiving surface 102b. Fig. 9 As shown, the position of the switching valve 102 is pushed upward. The switching valve 102 allows the fluid output from the pressure regulating valve 50A to flow to the shutoff valve 54 without passing through the throttle valve 100. Thus, in the standby mode, the fluid of the second pressure P2 output from the pressure regulating valve 50A is supplied to the external device 42.

[0091] Fig.10 2 is a circuit diagram of the valve assembly 20A in the isolation mode. When the valve assembly 20A operates in the isolation mode, the electrical signal output from the pressure regulating valve control unit 76 to the pilot valve 50p of the pressure regulating valve 50A is disconnected. The pressure regulating valve 50A outputs the fluid at the first pressure P1. In addition, the pressure regulating valve 50A may also output the fluid at the second pressure P2. The shut-off valve control unit 80 controls the shut-off valve 54 to close the main valve of the shut-off valve 54. The shut-off valve control unit 80 opens the outlet port of the shut-off valve 54 to the atmosphere.

[0092] The pressure at the outlet port of the shutoff valve 54 is equal to the atmospheric pressure PA. The fifth pressing force S5 of the second pressure P2 on the first pressure-receiving surface 102a is greater than the sixth pressing force S6 of the atmospheric pressure PA on the second pressure-receiving surface 102b. Fig.10 As shown, the position of the switching valve 102 is pressed downward.

[0093] When the isolation mode is switched to the operation mode, the shutoff valve control unit 80 controls the shutoff valve 54 to open the main valve of the shutoff valve 54. The pressure regulating valve 50A outputs the fluid at the first pressure P1. The switching valve 102 allows the fluid output from the pressure regulating valve 50A to flow to the shutoff valve 54 through the throttle valve 100. The pressure at the outlet port of the shutoff valve 54 gradually increases.

[0094] If the pressure of the outlet port of the shutoff valve 54 on the second pressure receiving surface 102b is greater than the first pressure S1 on the first pressure receiving surface 102a by the first pressure P1, the position of the switching valve 102 is pushed upward. Figure 8 As shown in FIG. 1 , the switching valve 102 allows the fluid output from the pressure regulating valve 50A to flow to the cut-off valve 54 without passing through the throttle valve 100. In this way, a so-called soft start function is realized. The switching valve 102 allows the fluid output from the pressure regulating valve 50A to flow to the cut-off valve 54 through the throttle valve 100 or to flow to the cut-off valve 54 without passing through the throttle valve 100, depending on the pressure of the fluid flowing out from the cut-off valve 54 to the external device 42.

[0095] In this modification, a flowchart showing the processing steps of the fluid control processing performed by the fluid control device 10 when the operation mode is switched to the standby mode is provided. Figure 5 Therefore, the description of this processing step is omitted.

[0096] Fig.11 This is a flowchart showing the processing procedure of the fluid control process performed by the fluid control device 10 when the standby mode is switched to the operating mode or the isolation mode. This processing procedure is performed by the processing circuit 60 included in the fluid control device 10 executing a program stored in the storage device 62 .

[0097] right Fig.11 The symbols assigned to the steps of the processing steps shown are the same as those for Figure 6 The processing steps shown in the figure are partially assigned the same symbols. In the steps with the same symbols, the same processing is performed, so the steps are omitted. Fig.11 Description of the processing of each step is shown. Fig.11 The flowchart shown does not include Figure 6 Steps S34 and S42 are shown. Therefore, if the process of step S32 is completed, the process of step S36 is performed. In the case of "yes" in step S40, the process steps proceed to step S44.

[0098] Fig.12 1 is a flowchart showing a process procedure of a fluid control process performed by the fluid control device 10 when the isolation mode is switched to the operation mode. This process procedure is performed by the processing circuit 60 included in the fluid control device 10 executing a program stored in the storage device 62 .

[0099] right Fig.12 The symbols assigned to the steps of the processing steps shown are the same as those for Figure 7 The processing steps shown in the figure are partially assigned the same symbols. In the steps with the same symbols, the same processing is performed, so the steps are omitted. Fig.12 Description of the processing of each step is shown. Fig.12 The flowchart shown does not include Figure 7 Therefore, if the process of step S62 is completed, the process of step S66 is performed.

[0100] (Variant 2)

[0101] In the above embodiment, the standby mode is switched to the isolation mode when the second predetermined time TM2 has passed in the standby mode. In the fluid control device 10 of Modification 2, when the operator prohibits the transition to the isolation mode, the standby mode is maintained even if the second predetermined time TM2 has passed in the standby mode.

[0102] Fig.13 1 is a flowchart for explaining the processing steps of the fluid control processing performed by the fluid control device 10 when there is an instruction C4 prohibiting the transition to the isolation mode. This processing step is performed by the processing circuit 60 of the fluid control device 10 executing the program stored in the storage device 62. Fig.13 The steps of the present processing steps are shown in the figure. Figure 6 The steps of the processing steps shown are assigned the same reference numerals. In the steps having the same reference numerals, the same processing is performed, and therefore the description of the processing in these steps is omitted.

[0103] exist Fig.13 In, with Figure 6 In the case of "yes" in step S40, the process proceeds to step S80. In step S80, the pressure regulating valve control unit 76 determines whether the interface unit 70 has received the instruction C4 from the operator. The instruction C4 indicates prohibition of transition to the isolation mode.

[0104] If "Yes" is determined in step S80, this process step ends. Therefore, even if the second predetermined time TM2 has elapsed in the standby mode, the standby mode is maintained. If "No" is determined in step S80, this process step proceeds to step S42.

[0105] (Variant 3)

[0106] In the fluid control system 10 of the third modification, when the operator instructs to return to the standby mode, the isolation mode is switched to the standby mode.

[0107] Fig.14 1 is a flowchart for explaining the processing steps of the fluid control processing performed by the fluid control device 10 when the isolation mode is switched to the standby mode. This processing step is performed by the processing circuit 60 of the fluid control device 10 executing the program stored in the storage device 62. Fig.14The steps of the present processing steps are shown in the figure. Figure 7 The steps of the processing steps shown are assigned the same reference numerals. In the steps having the same reference numerals, the same processing is performed, and therefore the description of the processing in these steps is omitted.

[0108] exist Fig.14 In, with Figure 7 Different, the processing of steps S90, S92, S94 and S96 is added. In the case of "No" in step S60, this processing step proceeds to step S90. In step S90, the shut-off valve control unit 80 determines whether the interface unit 70 has obtained the instruction C5 of the operator. Instruction C5 indicates that the operator has instructed to return to the standby mode. In the case of "Yes" in step S90, this processing step proceeds to step S92. In the case of "No" in step S90, this processing step returns to step S60.

[0109] In step S92, the shutoff valve control unit 80 controls the shutoff valve 54 to open the shutoff valve 54. If the pressure regulating valve 50 is opened in the subsequent process, the fluid output from the pressure regulating valve 50 is supplied to the external device 42.

[0110] In step S94, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the pressure P of the fluid output from the pressure regulating valve 50 increases from the atmospheric pressure PA to the second pressure P2 at an increase rate determined according to time. In step S96, the pressure regulating valve control unit 76 controls the pressure regulating valve 50 so that the fluid is output from the pressure regulating valve 50 at the second pressure P2. If the process of step S96 is completed, this process step ends. The valve assembly 20 operates in the standby mode.

[0111] (Variant 4)

[0112] In the above-mentioned embodiment, when it is determined that the flow rate F acquired in the operation mode is continuously below the threshold value FT for more than the first predetermined time TM1 and the standby mode is permitted by the operator, the operation mode is switched to the standby mode. In the fluid control device 10 of the fourth modification, when the operator prohibits the transition to the standby mode in advance, the operation mode is maintained.

[0113] Fig.15 1 is a flowchart for explaining the processing steps of the fluid control processing performed by the fluid control device 10 when there is an instruction C3 prohibiting the transition to the standby mode. This processing step is performed by the processing circuit 60 of the fluid control device 10 executing the program stored in the storage device 62. Fig.15 The steps of the present processing steps are shown in the figure. Figure 5The steps of the processing steps shown are assigned the same reference numerals. In the steps having the same reference numerals, the same processing is performed, and therefore the description of the processing in these steps is omitted.

[0114] exist Fig.15 In, with Figure 5 If the answer is "yes" in step S16, the process proceeds to step S100. In step S100, the pressure regulating valve control unit 76 determines whether the interface unit 70 has received the instruction C3 from the operator. The instruction C3 indicates prohibition of transition to the standby mode.

[0115] If the instruction C3 is acquired in advance in the operation mode, the result is "Yes" in step S100. If the result is "Yes" in step S100, this process step ends. The valve assembly 20 operates in the operation mode. If the result is "No" in step S100, this process step proceeds to step S18.

[0116] (Variant 5)

[0117] In the above embodiment, the pressure regulating valve 50 is a proportional control valve that adjusts the pressure of the fluid according to an electrical signal. The pilot valve of the pressure regulating valve 50 is actuated according to the electrical signal output by the pressure regulating valve control unit 76. The pressure regulating valve control unit 76 that actuates the pilot valve of the pressure regulating valve 50 may be integrally mounted with the housing of the pressure regulating valve 50. That is, the pressure regulating valve control unit 76 and the pressure regulating valve 50 may be an integral component MR.

[0118] Similarly, the shutoff valve control unit 80 and the shutoff valve 54 may be an integrated unit MS. The interface unit 70, the timer unit 72, the flow rate determination unit 74, the flow rate acquisition unit 78, and the flow rate measurement device 52 may be an integrated unit MM. The units MR, MS, and MM are each replaceable.

[0119] For example, an old component MR currently in use can be replaced with a new component MR. An old component MS currently in use can be replaced with a new component MS. An old component MM currently in use can be replaced with a new component MM.

[0120] In the above-mentioned modification 1, the pressure regulating valve 50A operates the pilot valve 50p of the pressure regulating valve 50A according to the electrical signal corresponding to the on and off. Such a pressure regulating valve control unit 76 for operating the pilot valve 50p of the pressure regulating valve 50A may be integrally mounted with the housing of the main valve 50m and the pilot valve 50p of the pressure regulating valve 50A. That is, the pressure regulating valve control unit 76 and the pressure regulating valve 50A may also be an integral component MP.

[0121] Similarly, the shut-off valve control unit 80, the shut-off valve 54, the throttle valve 100, and the switching valve 102 may also be an integrated component MG. The interface unit 70, the timing unit 72, the flow rate determination unit 74, the flow rate acquisition unit 78, and the flow rate measurement device 52 may also be an integrated component MM. The components MP, MG, and MM are each replaceable.

[0122] For example, an old module MP currently in use can be replaced with a new module MP. An old module MG currently in use can be replaced with a new module MG. An old module MM currently in use can be replaced with a new module MM.

[0123] (Variant 6)

[0124] The flow meter 52 can measure the temperature and pressure of the fluid in addition to measuring the flow rate F of the fluid passing through the valve assembly 20. The flow acquisition unit 78 acquires the flow rate F, temperature, and pressure measured by the flow meter 52 from the flow meter 52. The flow acquisition unit 78 can acquire the accumulated flow rate by performing calculations using the flow rate F acquired from the flow meter 52.

[0125] The interface 70 notifies the operator terminal 90 of information related to the flow rate F, the accumulated flow rate, the temperature and the pressure, and other information. Other information notified to the operator from the interface 70 includes information on the operating state of the valve assembly 20 and information on the body dimensions of the fluid pressure supply device 30.

[0126] The processing circuit of the operator terminal 90 executes the program stored in the storage device of the operator terminal 90, thereby outputting the information notified from the fluid control device 10 to the display device of the operator terminal 90. The processing circuit of the operator terminal 90 executes the program stored in the storage device of the operator terminal 90, thereby outputting a recommendation screen of a new fluid pressure supply device 30 having a main body size that matches the information notified from the fluid control device 10 to the display device of the operator terminal 90.

[0127] [Inventions according to embodiments]

[0128] The invention that can be grasped based on the above-mentioned embodiment and modified examples will be described below.

[0129] (1) A fluid control device 10, a control valve assembly 20, the valve assembly comprising: a pressure regulating valve 50, the pressure regulating valve being capable of regulating the pressure of a fluid supplied from a fluid supply source 40; and a shut-off valve 54, the shut-off valve being capable of shutting off the supply of the fluid output from the pressure regulating valve to an external device 42, wherein the fluid control device 10 comprises: a flow acquisition unit 78, the flow acquisition unit acquiring a flow rate F of the fluid passing through the valve assembly from a flow meter 52; a flow determination unit 74, the flow determination unit determining whether the acquired flow rate continues to be below a threshold value FT for more than a first specified time TM1; and a pressure regulating valve control unit 76, the pressure regulating valve control unit determining whether the acquired flow rate continues to be below a threshold value FT for more than a first specified time TM1. When the flow rate obtained from the pressure regulating valve in the operation mode of outputting the fluid at a pressure P1 is continuously below the threshold value for more than the first prescribed time and the operator permits the standby mode, the pressure regulating valve is controlled so that the fluid is output from the pressure regulating valve at a second pressure P2 lower than the first pressure, thereby switching the operation mode to the standby mode; and a cut-off valve control unit 80, which controls the cut-off valve so that the supply of the fluid output from the pressure regulating valve to the external device is cut off when the second prescribed time TM2 has passed in the standby mode, thereby switching the standby mode to the isolation mode. Thus, the fluid control device can supply the fluid to the external device at a pressure lower than usual, and can also stop the supply of the fluid to the external device. Since the fluid supply is automatically stopped, the fluid can be saved when the operation of the external device is stopped for a long time.

[0130] (2) Alternatively, the fluid output from the pressure regulating valve flows out from the outlet of the valve assembly and is supplied to the external device, and the cut-off valve control unit controls the cut-off valve to cut off the supply of the fluid to the external device and opens the outlet of the valve assembly to the atmosphere. Thus, the pressure of the outlet of the valve assembly can be quickly reduced.

[0131] (3) In the isolation mode, when the operator instructs to return to the operation mode, the pressure regulating valve control unit controls the pressure regulating valve to output the fluid at the first pressure from the pressure regulating valve, and the shutoff valve control unit controls the shutoff valve to supply the fluid output from the pressure regulating valve to the external device. Thus, the isolation mode can be switched to the operation mode at an appropriate timing.

[0132] (4) In the isolation mode, when the operator instructs to return to the standby mode, the shutoff valve control unit may control the shutoff valve to release the shutoff of the fluid, thereby resuming the supply of the fluid to the external device at the first pressure at an appropriate timing.

[0133] (5) If the operator prohibits the switch to the isolation mode, the shutoff valve control unit may not switch the standby mode to the isolation mode even if the second predetermined time has passed in the standby mode. Thus, even if the operation of the external device is stopped for a long time, the recovery time to the operating mode can be shortened.

[0134] (6) In the standby mode, when the operator prohibits the standby mode, the pressure regulating valve control unit controls the pressure regulating valve to output the fluid from the pressure regulating valve at the first pressure, thereby switching the standby mode to the operation mode. Thus, the supply of the fluid to the external device at the first pressure can be quickly resumed.

[0135] (7) When the operator prohibits the transition to the standby mode, the pressure regulating valve control unit may not switch the operation mode to the standby mode even if it is determined that the flow rate acquired in the operation mode has been continuously below the threshold value for more than the first predetermined time. Thus, the supply of the fluid to the external device at the first pressure can be maintained.

[0136] (8) The pressure regulating valve may be a proportional control valve that regulates the pressure of the fluid according to an electrical signal, and in the isolation mode, the pressure regulating valve control unit controls the pressure regulating valve to close the pressure regulating valve. This can prevent deterioration of components constituting the valve assembly.

[0137] (9) Alternatively, the pressure regulating valve may be a proportional control valve that regulates the pressure of the fluid according to an electrical signal, and the pressure regulating valve control unit may control the pressure regulating valve so that the pressure of the fluid regulated by the pressure regulating valve increases at an increase rate determined according to time. Thus, a soft start function may be realized. In the case where the external device that supplies the fluid has a cylinder, the rod may be prevented from flying out due to a sudden pressure change.

[0138] (10) Alternatively, the valve assembly may include a throttle valve 100 and a switching valve 102 between the pressure regulating valve and the cut-off valve, and the switching valve may allow the fluid output from the pressure regulating valve to flow to the cut-off valve through the throttle valve or to flow to the cut-off valve without passing through the throttle valve, depending on the pressure of the fluid flowing out from the cut-off valve to the external device. In this way, a soft start function may be achieved. In the case where the external device supplying the fluid includes a cylinder, the rod may be prevented from flying out due to a sudden pressure change.

[0139] (11) The fluid pressure supply device 30 includes the fluid control device and the valve assembly. Thus, it is possible to provide a fluid pressure supply device that automatically stops the supply of fluid to an external device that is stopped for a long period of time.

[0140] (12) A fluid control method, a control valve assembly 20, the valve assembly comprising: a pressure regulating valve 50, the pressure regulating valve being capable of regulating the pressure of a fluid supplied from a fluid supply source 40; and a shut-off valve 54, the shut-off valve being capable of shutting off the supply of the fluid output from the pressure regulating valve to an external device 42, wherein the fluid control method comprises: a flow acquisition step, acquiring a flow rate F of the fluid passing through the valve assembly from a flow meter 52; a flow determination step, determining whether the acquired flow rate is continuously below a threshold value FT for a first predetermined time period TM1 or longer; a first pressure regulating valve control step, determining whether the flow rate is continuously below a threshold value FT for a first predetermined time period TM1 or longer; and a first pressure regulating valve control step, determining whether the flow rate is continuously below a threshold value FT for a first predetermined time period TM1 or longer. In the operation mode in which the pressure regulating valve outputs the fluid, when the flow rate obtained is continuously below the threshold value for more than the first prescribed time and the standby mode is permitted by the operator, the pressure regulating valve is controlled so that the fluid is output from the pressure regulating valve at a second pressure P2 lower than the first pressure, and the operation mode is switched to the standby mode; and a first shut-off valve control process, when a second prescribed time TM2 has passed in the standby mode, the shut-off valve is controlled so that the supply of the fluid output from the pressure regulating valve to the external device is cut off, thereby switching the standby mode to the isolation mode. Thus, the fluid can be supplied to the external device at a pressure lower than usual, and the supply of the fluid to the external device can also be stopped. Since the fluid supply is automatically stopped, the fluid can be saved when the operation of the external device is stopped for a long time.

[0141] (13) The fluid control method may further include the following steps: a second pressure regulating valve control step of controlling the pressure regulating valve so that the fluid is output from the pressure regulating valve at the first pressure when the operator instructs to return to the operation mode in the isolation mode; and a second shut-off valve control step of controlling the shut-off valve so that the fluid output from the pressure regulating valve is supplied to the external device when the second pressure regulating valve control step is performed. Thus, the isolation mode can be switched to the operation mode at an appropriate timing.

[0142] In addition, the present invention is not limited to the above-mentioned invention, and various structures can be adopted without departing from the gist of the present invention.

[0143] Explanation of symbols

[0144] 10Fluid control device

[0145] 20 valve assembly

[0146] 30 Fluid pressure supply device

[0147] 40 Fluid supply source

[0148] 42 External devices

[0149] 50 Pressure regulating valve

[0150] 52 Flow Meter

[0151] 54 cut-off valve

[0152] 60 processing circuit

[0153] 62 Storage Devices

[0154] 70 Interface

[0155] 72 Timing Department

[0156] 74 Flow rate determination unit

[0157] 76 Pressure regulating valve control unit

[0158] 78 Traffic Acquisition Department

[0159] 80 cut-off valve control unit

[0160] 90 Operator Terminal

[0161] 100 throttle valve

[0162] 102 switching valve.

Claims

1. A fluid control device (10), a control valve assembly (20), the valve assembly comprising: a pressure regulating valve (50) capable of regulating the pressure of a fluid supplied from a fluid supply source (40); and a shutoff valve (54) capable of shutting off the supply of the fluid output from the pressure regulating valve to an external device (42), It is characterized in that The fluid control device (10) comprises: a flow acquisition unit (78) for acquiring a flow rate (F) of the fluid passing through the valve assembly from a flow meter (52); a flow rate determination unit (74) for determining whether the acquired flow rate is continuously below a threshold value (FT) for a first predetermined time period (TM1); a pressure regulating valve control unit (76) for controlling the pressure regulating valve so that the fluid is output from the pressure regulating valve at a second pressure (P2) lower than the first pressure, thereby switching the operation mode to the standby mode, when it is determined that the flow rate obtained in the operation mode of outputting the fluid from the pressure regulating valve at a first pressure (P1) has been continuously below the threshold value for more than the first predetermined time and the standby mode is permitted by an operator; as well as A shutoff valve control unit (80) controls the shutoff valve so that, when a second predetermined time (TM2) has elapsed in the standby mode, the supply of the fluid output from the pressure regulating valve to the external device is shut off, thereby switching the standby mode to the isolation mode.

2. The fluid control device according to claim 1, characterized in that: The fluid output from the pressure regulating valve flows out from the outlet of the valve assembly and is supplied to the external device. The shutoff valve control unit controls the shutoff valve to shut off the supply of the fluid to the external device and opens the outflow port of the valve assembly to the atmosphere.

3. The fluid control device according to claim 1, characterized in that: In the isolation mode, when the operator is instructed to return to the operating mode, the pressure regulating valve control unit controls the pressure regulating valve to output the fluid of the first pressure from the pressure regulating valve, and the shut-off valve control unit controls the shut-off valve to supply the fluid output from the pressure regulating valve to the external device.

4. The fluid control device according to claim 1, characterized in that: In the isolation mode, when the operator instructs to return to the standby mode, the shutoff valve control unit controls the shutoff valve to release the shutoff of the fluid.

5. The fluid control device according to claim 1, characterized in that: When the operator prohibits the transition to the isolation mode, the shutoff valve control unit does not switch the standby mode to the isolation mode even if the second predetermined time has elapsed in the standby mode.

6. The fluid control device according to claim 1, characterized in that: In the standby mode, when the operator prohibits the standby mode, the pressure regulating valve control unit controls the pressure regulating valve to output the fluid at the first pressure from the pressure regulating valve, thereby switching the standby mode to the operation mode.

7. The fluid control device according to claim 1, characterized in that: When the operator prohibits the transition to the standby mode, the pressure regulating valve control unit does not switch the operation mode to the standby mode even if it is determined that the flow rate acquired in the operation mode has been continuously below the threshold value for more than the first predetermined time.

8. The fluid control device according to claim 1, characterized in that: The pressure regulating valve is a proportional control valve that adjusts the pressure of the fluid according to an electrical signal. In the isolation mode, the pressure regulating valve control unit controls the pressure regulating valve to close the pressure regulating valve.

9. The fluid control device according to claim 1, characterized in that: The pressure regulating valve is a proportional control valve that adjusts the pressure of the fluid according to an electrical signal. The pressure regulating valve control unit controls the pressure regulating valve so that the pressure of the fluid regulated by the pressure regulating valve increases at an increase rate determined according to time.

10. The fluid control device according to claim 3, characterized in that: The valve assembly includes a throttle valve (100) and a switching valve (102) between the pressure regulating valve and the shutoff valve. The switching valve allows the fluid output from the pressure regulating valve to flow to the shutoff valve through the throttle valve or to flow to the shutoff valve without passing through the throttle valve, according to the pressure of the fluid flowing out from the shutoff valve to the external device.

11. A fluid pressure supply device (30), characterized in that: have: The fluid control device according to any one of claims 1 to 10; and The valve assembly.

12. A fluid control method, comprising a control valve assembly (20), the valve assembly comprising: a pressure regulating valve (50) capable of regulating the pressure of a fluid supplied from a fluid supply source (40); and a shutoff valve (54) capable of shutting off the supply of the fluid output from the pressure regulating valve to an external device (42), It is characterized in that The fluid control method comprises the following steps: A flow acquisition step of acquiring a flow rate (F) of the fluid passing through the valve assembly from a flow meter (52); a flow rate determination step, determining whether the acquired flow rate is continuously below a threshold value (FT) for more than a first specified time (TM1); a first pressure regulating valve control step of controlling the pressure regulating valve so that the fluid is output from the pressure regulating valve at a second pressure (P2) lower than the first pressure, thereby switching the operation mode to the standby mode, when it is determined that the flow rate obtained in the operation mode of outputting the fluid from the pressure regulating valve at a first pressure (P1) has been continuously below the threshold value for more than the first predetermined time and the standby mode is permitted by the operator; as well as The first shutoff valve control step controls the shutoff valve so that the supply of the fluid output from the pressure regulating valve to the external device is shut off when a second predetermined time (TM2) has elapsed in the standby mode, thereby switching the standby mode to the isolation mode.

13. The fluid control method according to claim 12, characterized in that: It also has the following processes: a second pressure regulating valve control step of controlling the pressure regulating valve so that the fluid is output from the pressure regulating valve at the first pressure when the operator instructs to return to the operation mode in the isolation mode; as well as The second shutoff valve control step controls the shutoff valve so that the fluid output from the pressure regulating valve is supplied to the external device when the second pressure regulating valve control step is performed.

Images