Pressure detection system

Abstract

The utility model provides a pressure detection system, which is used for detecting a pressure instrument and comprises a pressure input port, a first pressure control valve, a first pressure accommodating cavity, a second pressure control valve, a first stop valve, a first atmosphere interface, a second pressure accommodating cavity, a second atmosphere interface, a first pressure reducer and a pressure output port, the first end of the first stop valve is connected with the second end of the second pressure control valve through a pipeline, the second end of the first stop valve is connected with the first atmosphere connector through a pipeline, the second end of the second pressure control valve is connected with the second pressure containing cavity through a pipeline, and the high-pressure end of the first pressure reducer is connected with the second pressure containing cavity. The low-pressure end of the first pressure reducer is connected with a second atmosphere interface through a pipeline; according to the pressure detection system, the first stop valve and the first pressure reducer are arranged, compared with the mode that the pressure medium is released from the first pressure containing cavity to the atmospheric pressure, the flow rate of the pressure medium from the first pressure containing cavity to the second pressure containing cavity is smaller, and the pressure control accuracy of the pressure detection system can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure measurement, in particular to a pressure detection system. Background Art

[0002] Pressure instruments are widely used in many fields such as petroleum, transportation, food, biomedicine, etc. In order to ensure the measurement accuracy of pressure instruments, pressure instruments need to be tested.

[0003] A related technology, such as Figure 1 As shown, the pressure detection system includes a pressure output port 110, a boost port 041 and a pressure reducing port 042. The pressure output port 110 is used to connect to the instrument to be tested 010, the boost port 031 is used to connect to the pressure generating device 020, and the pressure reducing port 032 is used to connect to the atmosphere. A boost valve 041 is set between the pressure output port 110 and the boost port 031, and a pressure reducing valve 042 is set between the pressure output port 110 and the pressure reducing port 032. By periodically controlling the boost valve 041 and the pressure reducing valve 042, the medium pressure of the pressure output port 110 can be adjusted so that the medium pressure of the pressure output port 110 reaches the detection pressure; in this related art, when the pressure difference between the medium pressure of the pressure output port 110 and the atmospheric pressure is large, the amount of pressure medium passing through the pressure reducing valve 042 per unit time is large, thereby resulting in a large rate of change of the medium pressure of the pressure output port 110, and a low pressure control accuracy of the pressure output port 110, which affects the accuracy of the pressure detection result. Utility Model Content

[0004] The present application provides a pressure detection system, which aims to improve the pressure control accuracy of a pressure output port.

[0005] The embodiment of the present application provides a pressure detection system for detecting a pressure instrument, comprising: a pressure input port for connecting a pressure generating device, wherein the medium pressure provided by the pressure generating device is higher than the detection pressure required for detecting the pressure instrument; a first pressure control valve, wherein the first end of the first pressure control valve is connected to the pressure input port through a pipeline; a first pressure chamber for accommodating a pressure medium, wherein the second end of the first pressure control valve is connected to the first pressure chamber; a second pressure control valve, wherein the first end of the second pressure control valve is connected to the first pressure chamber; a first stop valve, wherein the first end of the first stop valve is connected to the second end of the second pressure control valve through a pipeline; a first atmospheric interface for connecting Atmosphere, the second end of the first stop valve is connected to the first atmospheric interface through a pipeline; the second pressure chamber is used to accommodate pressure medium, and the second end of the second pressure control valve is connected to the second pressure chamber through a pipeline; the second atmospheric interface is used to connect to the atmosphere; the first pressure reducer, the high-pressure end of the first pressure reducer is connected to the second pressure chamber, and the low-pressure end of the first pressure reducer is connected to the second atmospheric interface through a pipeline, the medium pressure at the high-pressure end of the first pressure reducer is higher than the medium pressure at the low-pressure end of the first pressure reducer, and the medium pressure at the high-pressure end of the first pressure reducer is lower than the detection pressure; the pressure output port is used to connect a pressure instrument, and the pressure output port is connected to the first pressure chamber.

[0006] In the embodiment of the present application, the high-pressure end of the first pressure reducer is connected to the second pressure chamber, and the low-pressure end of the first pressure reducer is connected to the second atmospheric interface. The medium pressure of the second pressure chamber is higher than the atmospheric pressure, and the pressure difference between the first pressure chamber and the second pressure chamber is less than the pressure difference between the first pressure chamber and the atmosphere. When the second pressure controlling valve is in the on state, compared with releasing the pressure medium from the first pressure chamber to the atmospheric pressure, the flow rate of the pressure medium from the first pressure chamber to the second pressure chamber is smaller, and the corresponding pressure change rate is also smaller. By controlling the on / off state of the second pressure controlling valve, the medium pressure of the first pressure chamber can be controlled more accurately, and the fluctuation amplitude of the medium pressure of the first pressure chamber is smaller. The first pressure chamber is connected to the pressure output port, which improves the pressure control accuracy of the medium pressure at the pressure output port, thereby improving the accuracy of the pressure detection result.

[0007] In some examples of the embodiments of the present application, the pressure detection system also includes: a first pressure measuring module, used to measure the medium pressure of the first pressure chamber, the measuring end of the first pressure measuring module is connected to the first pressure chamber, and the output end of the first pressure measuring module is coupled to the control end of the first shut-off valve.

[0008] In an embodiment of the present application, a first pressure measuring module measures the medium pressure of the first pressure chamber, and an output end of the first pressure measuring module is coupled to a control end of the first shut-off valve, so that the on / off state of the first shut-off valve can be controlled according to the medium pressure of the first pressure chamber. When the first shut-off valve is in an on state, the first pressure chamber is connected to the first atmospheric interface through a pipeline. When the second pressure control valve is in an on state, the pressure medium of the first pressure chamber flows out faster. When the first shut-off valve is in a cut-off state, the first pressure chamber is connected to the second pressure chamber through a pipeline. When the second pressure control valve is in an on state, the pressure medium of the first pressure chamber flows out slower.

[0009] In some examples of the embodiments of the present application, the second end of the aforementioned second pressure control valve is connected to the second pressure chamber through a pipeline, including: a first one-way valve, the input end of the first one-way valve is connected to the second end of the second pressure control valve through a pipeline, and the output end of the first one-way valve is connected to the second pressure chamber. When the medium pressure at the output end of the first one-way valve is higher than the medium pressure at the input end of the first one-way valve, the first one-way valve is in a cut-off state.

[0010] In the embodiment of the present application, a first one-way valve is provided and the one-way conduction characteristic of the one-way valve is utilized. When the medium pressure at the second end of the second pressure control valve is greater than the medium pressure in the second pressure chamber, the first one-way valve is in a conducting state, and the pressure medium can flow from the second end of the second pressure control valve to the second pressure chamber. When the medium pressure at the second end of the second pressure control valve is less than the medium pressure in the second pressure chamber, the first one-way valve is in a cut-off state, and the pressure medium cannot flow from the second pressure chamber to the second end of the second pressure control valve.

[0011] In some examples of the embodiments of the present application, the pressure detection system also includes: a third pressure control valve, the first end of the third pressure control valve is connected to the first end of the first pressure control valve through a pipeline, and the second end of the third pressure control valve is connected to the second pressure chamber; a second pressure measuring module, used to measure the medium pressure of the second pressure chamber, the measuring end of the second pressure measuring module is connected to the second pressure chamber, and the output end of the second pressure measuring module is coupled to the control end of the third pressure control valve.

[0012] In an embodiment of the present application, the second pressure chamber is connected to the first end of the first pressure control valve through the third pressure control valve. The pressure medium can flow into the second pressure chamber from the pressure input port through the third pressure control valve, so that the medium pressure of the second pressure chamber is increased to the set pressure of the first pressure reducing valve, reducing the influence of the medium pressure of the first pressure chamber on the medium pressure of the second pressure chamber. The second pressure measuring module measures the medium pressure of the second pressure chamber, and the output end of the second pressure measuring module is coupled to the control end of the third pressure control valve. The on / off state of the third pressure control valve can be controlled according to the medium pressure of the second pressure chamber.

[0013] In some examples of the embodiments of the present application, the pressure detection system also includes: a third pressure chamber, the second end of the second pressure control valve is connected to the third pressure chamber; a third atmospheric interface, used to connect to the atmosphere; a second pressure reducer, the high-pressure end of the second pressure reducer is connected to the third pressure chamber, and the low-pressure end of the second pressure reducer is connected to the third atmospheric interface through a pipeline, the medium pressure at the high-pressure end of the second pressure reducer is higher than the medium pressure at the low-pressure end of the second pressure reducer, the medium pressure at the high-pressure end of the second pressure reducer is higher than the medium pressure at the high-pressure end of the first pressure reducer, and is lower than the detection pressure.

[0014] In an embodiment of the present application, the high-pressure end of the second pressure reducer is connected to the third pressure chamber, and the low-pressure end of the second pressure reducer is connected to the third atmospheric interface through a pipeline. The medium pressure at the high-pressure end of the second pressure reducer is higher than the medium pressure at the high-pressure end of the first pressure reducer, and the medium pressure in the third pressure chamber is higher than the medium pressure in the second pressure chamber. When the second pressure control valve is in the on state, the pressure medium flow rate from the first pressure chamber to the third pressure chamber is smaller than that from the first pressure chamber to the second pressure chamber, and the corresponding pressure change rate is also smaller. By controlling the on / off state of the second pressure control valve, the medium pressure in the first pressure chamber can be controlled more accurately.

[0015] In some examples of the embodiments of the present application, the second end of the aforementioned second pressure-controlling valve is connected to the third pressure chamber, including: a second one-way valve, the input end of the second one-way valve is connected to the second end of the second pressure-controlling valve through a pipeline, and the output end of the second one-way valve is connected to the third pressure chamber. When the medium pressure at the output end of the second one-way valve is higher than the medium pressure at the input end of the second one-way valve, the second one-way valve is in a cut-off state; a fourth pressure-controlling valve, the first end of the fourth pressure-controlling valve is connected to the first end of the first pressure-controlling valve through a pipeline, and the second end of the fourth pressure-controlling valve is connected to the third pressure chamber; a third pressure measuring module, used to measure the medium pressure of the third pressure chamber, the measuring end of the third pressure measuring module is connected to the third pressure chamber, and the output end of the third pressure measuring module is coupled to the control end of the fourth pressure-controlling valve.

[0016] In the embodiment of the present application, a second one-way valve is provided and the one-way conduction characteristic of the one-way valve is utilized. When the medium pressure at the second end of the second pressure control valve is greater than the medium pressure in the third pressure chamber, the second one-way valve is in a conducting state, and the pressure medium can flow from the second end of the second pressure control valve to the third pressure chamber. When the medium pressure at the second end of the second pressure control valve is less than the medium pressure in the third pressure chamber, the second one-way valve is in a cut-off state, and the pressure medium cannot flow from the third pressure chamber to the second end of the second pressure control valve.

[0017] In some examples of the embodiments of the present application, the second end of the aforementioned second pressure control valve is connected to the second pressure chamber through a pipeline, including: the second end of the second pressure control valve is connected to the first end of the second stop valve through a pipeline, the second end of the second stop valve is connected to the second pressure chamber, and the control end of the second stop valve is coupled to the first pressure measuring module, and the first pressure measuring module is used to measure the medium pressure of the first pressure chamber.

[0018] In an embodiment of the present application, when the second stop valve is in the cut-off state, the second end of the second pressure controlling valve and the second pressure chamber are cut off. Furthermore, the second stop valve can cooperate with the first stop valve so that when the first stop valve is in the on state, the second end of the second pressure controlling valve is connected to the atmospheric pressure. When the second stop valve is in the on state, the second end of the second pressure controlling valve is connected to the set pressure of the first pressure reducer. When both the first stop valve and the second stop valve are in the cut-off state, the second end of the second pressure controlling valve is connected to the set pressure of the second pressure reducer.

[0019] In some examples of the embodiments of the present application, the low-pressure end of the aforementioned first pressure reducer is connected to the second atmospheric interface through a pipeline, including: the low-pressure end of the first pressure reducer is connected to the first end of the third stop valve through a pipeline, the second end of the third stop valve is connected to the second atmospheric interface through a pipeline, and the control end of the third stop valve is coupled to the first pressure measuring module, and the first pressure measuring module is used to measure the medium pressure of the first pressure chamber.

[0020] In an embodiment of the present application, when the third stop valve is in the cut-off state, if the pressure medium flows into the second pressure chamber, the medium pressure in the second pressure chamber continues to rise. Furthermore, the third stop valve can cooperate with the first one-way valve and the first stop valve, so that when the first stop valve is in the on state, the second end of the second pressure controlling valve is connected to the atmospheric pressure, when the first stop valve is in the cut-off state and the third stop valve is in the on state, the second end of the second pressure controlling valve is connected to the set pressure of the first pressure reducer, and when both the first stop valve and the third stop valve are in the cut-off state, the second end of the second pressure controlling valve is connected to the set pressure of the second pressure reducer.

[0021] In some examples of the embodiments of the present application, the first end of the aforementioned first pressure control valve is connected to the pressure input port through a pipeline, including: a fifth pressure control valve, the first end of the fifth pressure control valve is connected to the pressure input port through a pipeline, and the second end of the fifth pressure control valve is connected to the first end of the first pressure control valve through a pipeline; a differential pressure measuring module, the first end of the differential pressure measuring module is connected to the first end of the first pressure control valve through a pipeline, and the second end of the differential pressure measuring module is connected to the second end of the first pressure control valve through a pipeline, the differential pressure measuring module is used to measure the pressure difference between the first end of the differential pressure measuring module and the second end of the differential pressure measuring module, and the output end of the differential pressure measuring module is coupled to the control end of the fifth pressure control valve.

[0022] In an embodiment of the present application, the on / off state of the fifth pressure control valve can be controlled to adjust the medium pressure at the first end of the first pressure control valve. Through the setting of the differential pressure measurement module, the on / off state of the fifth pressure control valve can be controlled according to the pressure difference between the first end of the first pressure control valve and the second end of the first pressure control valve.

[0023] In some examples of the embodiments of the present application, the pressure detection system also includes: at least two instrument interfaces for fixedly connecting a pressure instrument; a pressure matching pipeline, the first end of the pressure matching pipeline is connected to the pressure output port, and at least two second ends of the pressure matching pipeline are respectively connected to at least two instrument interfaces; the capacity of the pressure matching pipeline is greater than the capacity of the first pressure chamber.

[0024] In the embodiment of the present application, since the capacity of the pressure distribution pipeline is greater than the capacity of the first pressure chamber, the pressure instrument is connected to the pressure output port through the pressure distribution pipeline, and the medium pressure fluctuations in the first pressure chamber can be absorbed by the pressure distribution pipeline, thereby reducing the pressure fluctuations of the instrument interface and improving the accuracy of the pressure detection results.

[0025] In some examples of the embodiments of the present application, the pressure detection system also includes: a fourth pressure measuring module, used to measure the medium pressure, the measuring end of the fourth pressure measuring module is detachably connected to an instrument interface, and the output end of the fourth pressure measuring module is coupled to the control end of the first shut-off valve.

[0026] In an embodiment of the present application, combined with the fact that the capacity of the pressure distribution pipeline is greater than the capacity of the first pressure chamber, during the pressure boosting process, the medium pressure of the instrument interface is less than the medium pressure of the pressure output port, and the output end of the fourth pressure measuring module is coupled with the control end of the first stop valve, and the on / off state of the first stop valve can be controlled according to the medium pressure of the instrument interface. Compared with controlling the on / off state of the first stop valve according to the medium pressure of the first pressure chamber or the medium pressure of the pressure output port, the response degree of the first stop valve to the medium pressure of the instrument interface can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a connection diagram of a pressure detection system in the prior art.

[0028] Figure 2 This is a connection diagram of a pressure detection system according to one example of an embodiment of the present application.

[0029] Figure 3 This is a connection diagram of the pressure detection system of Example 2 of the embodiment of the present application.

[0030] Figure 4 This is a connection diagram of the pressure detection system of Example 3 of the embodiment of the present application.

[0031] Figure 5 This is a connection diagram of the pressure detection system of Example 4 of the embodiment of the present application.

[0032] Figure 6 This is a connection diagram of the pressure detection system of Example 5 of the embodiment of the present application.

[0033] Figure 7 This is a connection diagram of the pressure detection system of Example 6 of the embodiment of the present application.

[0034] Figure 8 This is a connection diagram of the pressure detection system of Example 7 of the embodiment of the present application.

[0035] Figure 9 This is a connection diagram of the pressure detection system of Example 8 of the embodiment of the present application.

[0036] Reference numerals:

[0037] 010, instrument to be tested (pressure instrument), 020, pressure generating device, 031, boost port, 032, pressure reducing port, 041, boost valve, 042, pressure reducing valve, 110, pressure output port, 120, pressure input port, 130, first atmospheric interface, 140, second atmospheric interface, 150, third atmospheric interface, 160, instrument interface, 170, pressure distribution pipeline, 210, first pressure control valve, 220, second pressure control valve, 230, third pressure control valve, 231, third pressure control valve Valve control end, 240, fourth pressure control valve, 241, fourth pressure control valve control end, 250, fifth pressure control valve, 251, fifth pressure control valve control end, 310, first pressure chamber, 320, second pressure chamber, 330, third pressure chamber, 410, first stop valve, 411, first stop valve control end, 420, second stop valve, 421, second stop valve control end, 430, third stop valve, 431, third stop valve control end, 510, first pressure reducing valve , 511, the high-pressure end of the first pressure reducer, 512, the low-pressure end of the first pressure reducer, 520, the second pressure reducer, 521, the high-pressure end of the second pressure reducer, 522, the low-pressure end of the second pressure reducer, 610, the first pressure measuring module, 611, the measuring end of the first pressure measuring module, 612, the output end of the first pressure measuring module, 620, the second pressure measuring module, 621, the measuring end of the second pressure measuring module, 622, the output end of the second pressure measuring module, 630, the third pressure measuring module, 631, the third The measuring end of the pressure measuring module, 632, the output end of the third pressure measuring module, 640, the fourth pressure measuring module, 641, the measuring end of the fourth pressure measuring module, 642, the output end of the fourth pressure measuring module, 650, the differential pressure measuring module, 651, the output end of the differential pressure measuring module, 710, the first one-way valve, 711, the input end of the first one-way valve, 712, the output end of the first one-way valve, 720, the second one-way valve, 721, the input end of the second one-way valve, 722, the output end of the second one-way valve. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0039] It should be noted that many specific details are set forth in the following description to facilitate a full understanding of the present application. However, the present application can also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific implementation methods disclosed below.

[0040] The connection in this application can also be referred to as a medium transfer connection, including contact connection, pipeline connection and other connection methods that can realize the transfer of pressure medium. A valve or similar shut-off mechanism can be set in the pipeline or similar medium to realize the connection, so that when the valve is in the on state, the pressure medium can flow from one side of the connection to at least the other side of the connection. When the valve is in the off state, the pressure medium temporarily cannot flow from the cut-off pipeline.

[0041] Coupling in this application means that when two or more circuits form a network, if the current or voltage in one of the circuits changes, it can affect other circuits to also undergo similar changes. The coupling relationship can be achieved by wired transmission, wireless transmission, or other feasible implementation methods. In order to distinguish between coupling and medium transmission connection, solid lines are used to represent medium transmission connection and dotted lines are used to represent coupling in the drawings of the specification.

[0042] The pressure instrument in the embodiment of the present application and the instrument to be tested can be the same entity. The pressure instrument in the embodiment of the present application can be one or more of a general pressure gauge, a digital pressure gauge, a pressure switch, a pressure transmitter, a safety valve, a pressure sensor, and a pressure measurement module in other instruments.

[0043] The detection process in the embodiments of the present application can be a combination of one or more of the verification, calibration, verification, testing, and validation processes. For example, at least one detection pressure is determined according to the detection purpose of the instrument to be tested, and the pressure detection system provides a pressure medium with a detection pressure to the instrument to be tested. The instrument to be tested measures the medium pressure of the pressure medium to obtain the data to be tested. The data to be tested is processed according to the detection purpose to obtain the detection result.

[0044] The valve in the embodiment of the present application can have two states: on and off. When the valve is in the on state, pressure medium can flow from one end of the valve to the other end. When the valve is in the off state, pressure medium cannot pass through the valve. The pressure control valve in the embodiment of the present application can be a solenoid valve, a manually controlled valve, such as a motor-controlled needle valve, or other types of valves that can be used to control the flow of medium. The shut-off valve in the embodiment of the present application can be a solenoid valve, a manually controlled valve, such as a pneumatic or hydraulic ball valve, or other types of valves that can be used to shut off a pipeline. The one-way valve in the embodiment of the present application can include an input end and an output end. Pressure medium flows unidirectionally in the one-way valve. Specifically, when the pressure of the medium at the input end of the one-way valve is higher than the pressure of the medium at the output end of the one-way valve, the one-way valve automatically enters the on state, at which point pressure medium flows from the input end of the one-way valve to the output end of the one-way valve. When the pressure of the medium at the input end of the one-way valve is lower than the pressure of the medium at the output end of the one-way valve, the one-way valve automatically enters the off state, at which point pressure medium cannot pass through the one-way valve.

[0045] The pressure reducer in the embodiment of the present application can be a pressure reducer with an adjustable set pressure, or a pressure reducer with a fixed set pressure. The pressure reducer includes a high-pressure end and a low-pressure end. The medium pressure between the high-pressure end and the low-pressure end of the pressure reducer is equal to its set pressure. For example, the pressure reducer can provide a pressure difference between the high-pressure end and the low-pressure end through an elastic member, and adjust the size of the set pressure by adjusting the electromagnetic force or other force applied to the elastic member. For another example, the pressure reducer can control the medium flow by opening and closing the valve, and then control the pressure difference between the high-pressure end and the low-pressure end to reach the set pressure.

[0046] The pressure measuring module in the embodiment of the present application may include a pressure sensor or other pressure measuring element. The pressure measuring module can measure the medium pressure at its measuring end. The pressure measuring module may also include an output end. The pressure measuring module can output the measurement result in the form of an electrical signal from the output end. The output signal of the pressure measuring module can be different types such as 4-20mA, 0-5V, etc.

[0047] The pressure medium in the embodiment of the present application can be a gas medium or a liquid medium. It can be understood that a suitable pressure medium can be selected without violating the inventive concept of the embodiment of the present application.

[0048] The pressure generating device in the embodiment of the present application may be an air pump, a high-pressure gas cylinder, a booster, a booster piston or other types of devices if it is a gas medium, depending on the type of medium. If it is a liquid medium, the pressure generating device may be a liquid pump, a booster, a booster piston or other types of devices. The pressure generating device may continuously provide pressure medium. It can be understood that the pressure generating device in the embodiment of the present application may be part of the pressure detection system or a device outside the pressure detection system.

[0049] The embodiment of the present application provides a pressure detection system for detecting a pressure instrument 010, including: a pressure input port 120 for connecting to a pressure generating device 020, wherein the medium pressure provided by the pressure generating device 020 is higher than the detection pressure required for detecting the pressure instrument 010; a first pressure control valve 210, wherein the first end of the first pressure control valve 210 is connected to the pressure input port 120 through a pipeline; a first pressure chamber 310 for accommodating a pressure medium, wherein the second end of the first pressure control valve 210 is connected to the first pressure chamber 310; a second pressure control valve 220, wherein the first end of the second pressure control valve 220 is connected to the first pressure chamber 310; a first stop valve 410, wherein the first end of the first stop valve 410 is connected to the second end of the second pressure control valve 220 through a pipeline; a first atmospheric interface 130 for connecting to the atmosphere, wherein the first stop valve 410 is connected to the second end of the second pressure control valve 220; The second end of the check valve 410 is connected to the first atmospheric interface 130 through a pipeline; the second pressure chamber 320 is used to accommodate pressure medium, and the second end of the second pressure control valve 220 is connected to the second pressure chamber 320 through a pipeline; the second atmospheric interface 140 is used to connect to the atmosphere; the first pressure reducer 510, the high-pressure end 511 of the first pressure reducer 510 is connected to the second pressure chamber 320, and the low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140 through a pipeline, the medium pressure at the high-pressure end 511 of the first pressure reducer 510 is higher than the medium pressure at the low-pressure end 512 of the first pressure reducer 510, and the medium pressure at the high-pressure end 511 of the first pressure reducer 510 is lower than the detection pressure; the pressure output port 110 is used to connect a pressure instrument, and the pressure output port 110 is connected to the first pressure chamber 310.

[0050] Specifically, if Figure 2As shown, the pressure detection system includes a pressure input port 120, a first pressure control valve 210, a second pressure control valve 220, a first stop valve 410, a first atmospheric interface 130, a first pressure chamber 310, a pressure output port 110, a second pressure chamber 320, a first pressure reducer 510 and a second atmospheric interface 140; wherein, the pressure generating device 020 is connected to the pressure input port 120, the pressure input port 120 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, and the second pressure output port 110 is connected to the second pressure chamber 320. A pressure chamber 310 is connected to the pressure output port 110, the first pressure chamber 310 is connected to the first end of the second pressure controlling valve 220, the second end of the second pressure controlling valve 220 is connected to the first end of the first stop valve 410, the second end of the first stop valve 410 is connected to the first atmospheric interface 130, the second end of the second pressure controlling valve 220 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510, and the low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140.

[0051] During the pressure detection process, the first atmospheric interface 130 is connected to the atmosphere, the second atmospheric interface 140 is connected to the atmosphere, the pressure output port 110 is connected to the instrument to be tested 010, and the pressure medium flows from the pressure generating device 020 to the pressure input port 120. The medium pressure of the pressure generating device 020 is positive pressure and higher than the target pressure. The first pressure control valve 210 and the second pressure control valve 220 are periodically switched. The duty cycle of the first pressure control valve 210 increases, and the pressure medium flowing into the first pressure chamber 310 increases. The medium pressure of the first pressure chamber 310 tends to increase. The duty cycle of the second pressure control valve 220 increases, and the pressure medium flowing out of the first pressure chamber 310 increases. As the pressure of the medium in the first pressure chamber 310 increases, the medium pressure tends to decrease. By adjusting the duty cycle of the first pressure control valve 210 and the duty cycle of the second pressure control valve 220, the medium pressure in the first pressure chamber 310 can reach the detection pressure. The first pressure chamber 310 is connected to the instrument to be tested 010 through the pressure output port 110, so that the instrument to be tested 010 can measure the detection pressure. It can be understood that the factors affecting the pressure control accuracy of the second pressure control valve 220 include the control accuracy of the second pressure control valve 220 itself and the pressure difference at both ends of the second pressure control valve 220. When the control accuracy of the second pressure control valve 220 itself remains unchanged, , the greater the pressure difference across the second pressure control valve 220, the more pressure medium flows through the second pressure control valve 220 per unit time, and the greater the change in the medium pressure of the first pressure chamber 310; the smaller the pressure difference across the second pressure control valve 220, the less pressure medium flows through the second pressure control valve 220 per unit time, and the smaller the change in the medium pressure of the first pressure chamber 310. In the embodiment of the present application, since the second pressure chamber 320 is provided and the second pressure chamber 320 is connected to the second atmospheric interface 140 through the first pressure reducer 510, the medium pressure of the second pressure chamber 320 is greater than the atmospheric pressure. Accordingly, the pressure of the second pressure control valve 220 The medium pressure between the second end and the first end of the first stop valve 410 is higher than the atmospheric pressure. Compared with the second end of the second pressure control valve 220 being connected to the atmosphere, the pressure difference between the two ends of the second pressure control valve 220 can be reduced, thereby improving the pressure control accuracy of the second pressure control valve 220. Furthermore, when the first stop valve 410 is controlled to be in the cut-off state, the difference between the medium pressure of the second pressure chamber 320 and the atmospheric pressure is equal to the set pressure of the first pressure reducer 510, which can further reduce the pressure difference between the two ends of the second pressure control valve 220, thereby improving the pressure control accuracy of the second pressure control valve 220, and further improving the pressure control accuracy of the entire pressure detection system.

[0052] Exemplarily, the pressure detection system also includes: a first pressure measuring module 610, used to measure the medium pressure of the first pressure chamber 310, the measuring end 611 of the first pressure measuring module 610 is connected to the first pressure chamber 310, and the output end 612 of the first pressure measuring module 310 is coupled to the control end 411 of the first shut-off valve 410.

[0053] Specifically, if Figure 3 As shown, the pressure detection system includes a pressure input port 120, a first pressure control valve 210, a second pressure control valve 220, a first stop valve 410, a first atmospheric interface 130, a first pressure chamber 310, a pressure output port 110, a second pressure chamber 320, a first pressure reducer 510, a second atmospheric interface 140 and a first pressure measuring module 610; wherein, the pressure generating device 020 is connected to the pressure input port 120, the pressure input port 120 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, and the first pressure chamber 310 is connected to the pressure output port 110. The first pressure chamber 310 is connected to the first end of the second pressure controlling valve 220, the second end of the second pressure controlling valve 220 is connected to the first end of the first stop valve 410, the second end of the first stop valve 410 is connected to the first atmospheric interface 130, the first pressure chamber 310 is connected to the measuring end of the first pressure measuring module 610, the output end of the first pressure measuring module 610 is coupled to the control end 411 of the first stop valve 410, the second end of the second pressure controlling valve 220 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510, and the low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140.

[0054] The pressure detection process can refer to the aforementioned content of the embodiments of the present application. Further improvements can be made by pre-setting the cutoff pressure / conduction pressure in the first stop valve 410, and the first pressure measuring module 610 measures the medium pressure of the first pressure chamber 310, and periodically transmits the first measurement result to the first stop valve 410. When the first measurement result reaches the aforementioned set cutoff pressure / conduction pressure, the first stop valve 410 can automatically switch to the cutoff state / conduction state. Compared with manual control by the detection personnel based on the measurement results of the instrument to be tested 010, the response accuracy and timeliness of the first stop valve 410 can be improved, thereby improving the pressure control accuracy of the second pressure control valve 220, and then improving the pressure control accuracy of the entire pressure detection system.

[0055] Exemplarily, the pressure detection system also includes: the second end of the aforementioned second pressure control valve 220 is connected to the second pressure chamber 320 through a pipeline, including: a first one-way valve 710, the input end 711 of the first one-way valve 710 is connected to the second end of the second pressure control valve 220 through a pipeline, and the output end 712 of the first one-way valve 710 is connected to the second pressure chamber 320. When the medium pressure at the output end 712 of the first one-way valve 710 is higher than the medium pressure at the input end 711 of the first one-way valve 710, the first one-way valve 710 is in a cut-off state.

[0056] Exemplarily, the pressure detection system also includes: a third pressure control valve 230, the first end of the third pressure control valve 230 is connected to the first end of the first pressure control valve 210 through a pipeline, and the second end of the third pressure control valve 230 is connected to the second pressure chamber 320; a second pressure measuring module 620, for measuring the medium pressure of the second pressure chamber 320, the measuring end 621 of the second pressure measuring module 620 is connected to the second pressure chamber 320, and the output end 622 of the second pressure measuring module 620 is coupled to the control end 231 of the third pressure control valve 230.

[0057] Specifically, if Figure 4 As shown, the pressure detection system includes a pressure output port 110, a pressure input port 120, a first atmospheric interface 130, a second atmospheric interface 140, a first pressure control valve 210, a second pressure control valve 220, a third pressure control valve 230, a first pressure chamber 310, a second pressure chamber 320, a first stop valve 410, a first pressure reducer 510, a first pressure measuring module 610, a second pressure measuring module 620 and a first one-way valve 710; wherein, the pressure generating device 020 is connected to the pressure input port 120, the pressure input port 120 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, the first pressure chamber 310 is connected to the pressure output port 110, the first pressure chamber 310 is connected to the first end of the second pressure control valve 220, the second end of the second pressure control valve 220 is connected to the first end of the first stop valve 410, and the first stop valve The second end of the pressure regulating valve 410 is connected to the first atmospheric interface 130, the first pressure chamber 310 is connected to the measuring end of the first pressure measuring module 610, the output end of the first pressure measuring module 610 is coupled to the control end 411 of the first shut-off valve 410, the second end of the second pressure controlling valve 220 is connected to the input end 711 of the first one-way valve 710, the output end 712 of the first one-way valve 710 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510, the low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140, the pressure input port 120 is connected to the first end of the third pressure controlling valve 230, the second end of the third pressure controlling valve 230 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the measuring end of the second pressure measuring module 620, and the output end of the second pressure measuring module 620 is coupled to the control end of the third pressure controlling valve 230.

[0058] The pressure detection process can refer to the aforementioned content of the embodiment of the present application. During the pressure detection process, the first atmospheric interface 130 is connected to the atmosphere, the second atmospheric interface 140 is connected to the atmosphere, the pressure output port 110 is connected to the instrument to be tested 010, and the pressure medium flows from the pressure generating device 020 into the pressure input port 120. The medium pressure of the pressure generating device 020 is positive pressure and higher than the target pressure. The pressure medium flows into the second pressure chamber 320 through the pressure input port 120 and the third pressure control valve 230, so that the medium pressure of the second pressure chamber 320 increases. When the difference between the medium pressure of the second pressure chamber 320 and the atmospheric pressure is greater than the set pressure of the first pressure reducer 510, the first pressure reducer 510 is in a conducting state until the second pressure chamber 320 is closed. When the difference between the medium pressure in the pressure chamber 320 and the atmospheric pressure decreases to the set pressure of the first pressure reducer 510, the first pressure reducer 510 returns to the cut-off state. The output end of the second pressure measuring module 620 is coupled to the control end of the third pressure control valve 230. In some cases, the third pressure control valve 230 can control its on / off state based on the second measurement result of the second pressure measuring module 620. If the second measurement result is lower than the set cut-off pressure, the third pressure control valve 230 is in the on state, and the pressure medium continues to enter the second pressure chamber 320, causing the medium pressure in the second pressure chamber 320 to increase. If the second measurement result is higher than or equal to the set cut-off pressure, the third pressure control valve 230 is in the cut-off state.The second end of the second pressure control valve 220 is connected to the input end 711 of the first one-way valve 710, and the output end 712 of the first one-way valve 710 is connected to the second pressure chamber 320. Due to the setting of the first pressure reducer 510, the difference between the medium pressure of the second pressure chamber 320 and the atmospheric pressure is stable at the set pressure of the first pressure reducer 510. When the medium pressure of the second pressure chamber 320 is greater than the medium pressure at the second end of the second pressure control valve 220, due to the one-way conduction / guided cutoff characteristics of the first one-way valve 710, the pressure medium cannot flow from the second pressure chamber 320 to the second end of the second pressure control valve 220. When the medium pressure of the second pressure chamber 320 is less than the medium pressure at the second end of the second pressure control valve 220, the pressure medium can flow from the second end of the second pressure control valve 220 to the second pressure chamber 320. Furthermore, the setting of the first one-way valve 710 can be coordinated with the connection structure of the third pressure control valve 230. For example, the pressure detection system starts to increase pressure from atmospheric pressure. In the first stage of the pressure increase process, the pressure difference between the medium pressure of the first pressure chamber 310 and the atmospheric pressure is less than the pressure threshold. When the second pressure control valve 220 is in the on state, the pressure medium flows through the second pressure control valve 220 and the first stop valve 410. The rate is small. During this stage, the medium pressure in the second pressure chamber 320 may be higher than the medium pressure at the second end of the second pressure control valve 220. However, due to the setting of the first one-way valve 710, the control of the second pressure control valve 220 will not be affected. In the second stage of the pressure increase process, the pressure difference between the medium pressure in the first pressure chamber 310 and the atmospheric pressure is greater than the pressure threshold, and the first stop valve 410 is in the cut-off state. Since the medium pressure at the high-pressure end 511 of the first pressure reducer 510 is lower than the detection pressure, when the medium pressure in the first pressure chamber 310 reaches the detection pressure, the medium pressure in the first pressure chamber 310 is When the pressure difference between the test pressure and the second pressure chamber 320 is greater than zero, the pressure medium can flow from the first pressure chamber 310 through the first one-way valve 710 into the second pressure chamber 320. The first pressure reducer 510 then controls the flow rate based on the pressure difference between the two ends. During this stage, the pressure difference between the first pressure chamber 310 and the second pressure chamber 320 is less than the pressure difference between the first pressure chamber 310 and atmospheric pressure. Therefore, even if there is a large pressure difference between the test pressure and atmospheric pressure, the rate at which the pressure medium flows through the second pressure control valve 220 is low, resulting in higher pressure control accuracy for the second pressure control valve 220.

[0059] Exemplarily, the pressure detection system also includes: a third pressure chamber 330, the second end of the second pressure control valve 220 is connected to the third pressure chamber 330; a third atmospheric interface 150, for connecting to the atmosphere; a second pressure reducer 520, the high-pressure end 521 of the second pressure reducer 520 is connected to the third pressure chamber 330, and the low-pressure end 522 of the second pressure reducer 520 is connected to the third atmospheric interface 159 through a pipeline, the medium pressure of the high-pressure end 521 of the second pressure reducer 520 is higher than the medium pressure of the low-pressure end 522 of the second pressure reducer 520, and the medium pressure of the high-pressure end 521 of the second pressure reducer 520 is higher than the medium pressure of the high-pressure end 511 of the first pressure reducer 510, and is lower than the detection pressure.

[0060] Exemplarily, the pressure detection system further includes: the second end of the aforementioned second pressure control valve 220 is connected to the third pressure chamber 320, including: a second one-way valve 720, the input end 721 of the second one-way valve 720 is connected to the second end of the second pressure control valve 220 through a pipeline, and the output end 722 of the second one-way valve 720 is connected to the third pressure chamber 320. When the medium pressure at the output end 722 of the second one-way valve 720 is higher than the medium pressure at the input end 721 of the second one-way valve 720, the second one-way valve 720 is in a state of being ... 720 is in the cut-off state; the fourth pressure control valve 240, the first end of the fourth pressure control valve 240 is connected to the first end of the first pressure control valve 210 through a pipeline, and the second end of the fourth pressure control valve 240 is connected to the third pressure chamber 330; the third pressure measuring module 630 is used to measure the medium pressure of the third pressure chamber 330, the measuring end 631 of the third pressure measuring module 630 is connected to the third pressure chamber 330, and the output end 632 of the third pressure measuring module 630 is coupled to the control end 241 of the fourth pressure control valve 240.

[0061] Exemplarily, the pressure detection system also includes: the second end of the aforementioned second pressure control valve 220 is connected to the second pressure chamber 320 through a pipeline, including: the second end of the second pressure control valve 220 is connected to the first end of the second stop valve 420 through a pipeline, the second end of the second stop valve 420 is connected to the second pressure chamber 320, the control end 421 of the second stop valve 420 is coupled to the output end 612 of the first pressure measuring module 610, and the first pressure measuring module 610 is used to measure the medium pressure of the first pressure chamber.

[0062] Exemplarily, the pressure detection system also includes: the low-pressure end 512 of the aforementioned first pressure reducer 510 is connected to the second atmospheric interface 140 through a pipeline, including: the low-pressure end 512 of the first pressure reducer 510 is connected to the first end of the third stop valve 430 through a pipeline, the second end of the third stop valve 430 is connected to the second atmospheric interface 140 through a pipeline, the control end 431 of the third stop valve 430 is coupled to the output end 612 of the first pressure measuring module 610, and the first pressure measuring module 610 is used to measure the medium pressure of the first pressure chamber.

[0063] Specifically, for example, refer to Figure 5 As shown, the pressure detection system includes a pressure output port 110, a pressure input port 120, a first atmospheric interface 130, a second atmospheric interface 140, a third atmospheric interface 150, a first pressure control valve 210, a second pressure control valve 220, a first pressure chamber 310, a second pressure chamber 320, a third pressure chamber 330, a first stop valve 410, a first pressure reducer 510, a second pressure reducer 520, a first pressure measuring module 610, a first one-way valve 710 and a second one-way valve 720; wherein, the pressure generating device 020 and the pressure output port 120 are connected to each other. The pressure inlet 120 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, the first pressure chamber 310 is connected to the pressure output port 110, during the pressure detection process, the pressure output port 110 is connected to the instrument to be tested 010, the first pressure chamber 310 is connected to the first end of the second pressure control valve 220, the second end of the second pressure control valve 220 is connected to the first end of the first stop valve 410, and the second end of the first stop valve 410 is connected to the first stop valve 410. The first atmospheric interface 130 is connected. During the pressure detection process, the first atmospheric interface 130 is connected to the atmosphere, the first pressure chamber 310 is connected to the measuring end of the first pressure measuring module 610, the output end of the first pressure measuring module 610 is coupled to the control end of the first shut-off valve 410, the second end of the second pressure control valve 220 is connected to the input end 711 of the first one-way valve 710, the output end 712 of the first one-way valve 710 is connected to the second pressure chamber 320, and the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510. The low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140, the second end of the second pressure control valve 220 is connected to the input end 721 of the second one-way valve 720, the output end of the second one-way valve 720 is connected to the third pressure chamber 330, the third pressure chamber 330 is connected to the high-pressure end 521 of the second pressure reducer 520, and the low-pressure end 522 of the second pressure reducer 520 is connected to the third atmospheric interface 150. During the pressure detection process, the second atmospheric interface 140 and the third atmospheric interface 150 are both connected to the atmosphere.

[0064] During the pressure detection process, since the medium pressure at the high-pressure end 521 of the second pressure reducer 520 is higher than the medium pressure at the high-pressure end 511 of the first pressure reducer 510, that is, the set pressure of the second pressure reducer 520 is greater than the set pressure of the first pressure reducer 510, and the medium pressure at the high-pressure end 521 of the second pressure reducer 520 is less than the detection pressure, it can be understood that more options can be provided for the connection pressure of the second end of the second pressure control valve 220. On the one hand, during the pressure boosting process, if the first stop valve 410 is in the on state, the pressure medium flows through the second pressure chamber 310 according to the pressure difference between the first pressure chamber 310 and the atmospheric pressure. The second pressure-control valve 220, if the first stop valve 410 is in the cut-off state, the pressure medium flows through the second pressure-control valve 230 according to the pressure difference between the first pressure chamber 310 and the second pressure chamber 320. Furthermore, if the pressure resistance of the second pressure chamber 320 is large, the flow is insufficient or it is in the cut-off state, the medium pressure at the second end of the second pressure-control valve 220 continues to rise. When the medium pressure at the second end of the second pressure-control valve 220 is higher than the medium pressure of the third pressure chamber 330, the pressure medium flows through the second pressure-control valve 230 according to the pressure difference between the first pressure chamber 310 and the third pressure chamber 330.

[0065] Specifically, for example, referring to Figure 6As shown, the pressure detection system includes a pressure output port 110, a pressure input port 120, a first atmospheric interface 130, a second atmospheric interface 140, a third atmospheric interface 150, a first pressure control valve 210, a second pressure control valve 220, a third pressure control valve 230, a fourth pressure control valve 240, a first pressure chamber 310, a second pressure chamber 320, a third pressure chamber 330, a first stop valve 410, a second stop valve 420, a first pressure reducer 510, a second pressure reducer 520, a first pressure measuring module 610, a second pressure measuring module 620, a third pressure measuring module 630, and a second one-way valve 720;Among them, the pressure generating device 020 is connected to the pressure input port 120, the pressure input port 120 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, the first pressure chamber 310 is connected to the pressure output port 110, during the pressure detection process, the pressure output port 110 is connected to the instrument to be tested 010, the first pressure chamber 310 is connected to the first end of the second pressure control valve 220, the second end of the second pressure control valve 220 is connected to the first end of the first stop valve 410, and the second end of the first stop valve 410 is connected to the first atmospheric interface 1 30 is connected. During the pressure detection process, the first atmospheric interface 130 is connected to the atmosphere, the first pressure chamber 310 is connected to the measuring end of the first pressure measuring module 610, the output end of the first pressure measuring module 610 is coupled to the control end of the first shut-off valve 410, the second end of the second pressure control valve 220 is connected to the first end of the second shut-off valve 420, the second end of the second shut-off valve 420 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510, the low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140, and the first pressure measuring module 610 is connected to the control end of the first shut-off valve 410. The output end of the pressure module 610 is coupled to the control end of the second stop valve 420. During the pressure detection process, the second atmospheric interface 140 is connected to the atmosphere, the second end of the second pressure control valve 220 is connected to the input end 721 of the second one-way valve 720, the output end of the second one-way valve 720 is connected to the third pressure chamber 330, the third pressure chamber 330 is connected to the high-pressure end 521 of the second pressure reducer 520, the low-pressure end 522 of the second pressure reducer 520 is connected to the third atmospheric interface 150, and during the pressure detection process, the third atmospheric interface 150 is connected to the atmosphere, and the pressure input port 120 is connected to the third control valve 220. The first end of the third pressure control valve 230 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the measuring end of the second pressure measuring module 620, the output end of the second pressure measuring module 620 is coupled to the control end of the third pressure control valve 230, the pressure input port 120 is connected to the first end of the fourth pressure control valve 240, the second end of the fourth pressure control valve 240 is connected to the third pressure chamber 330, the third pressure chamber 330 is connected to the measuring end of the third pressure measuring module 630, and the output end of the third pressure measuring module 630 is coupled to the control end of the fourth pressure control valve 240.

[0066] During the pressure detection process, the third pressure control valve 230 can be switched on / off according to the second measurement result of the second pressure measuring module 620, and in conjunction with the first pressure reducer 510, the difference between the medium pressure of the second pressure chamber 320 and the atmospheric pressure can reach the set pressure of the first pressure reducer 510. The fourth pressure control valve 240 can be switched on / off according to the third measurement result of the third pressure measuring module 630, and in conjunction with the second pressure reducer 520, the difference between the medium pressure of the third pressure chamber 330 and the atmospheric pressure can reach the set pressure of the second pressure reducer 510. The medium pressure of the third pressure chamber 330 is greater than the medium pressure of the second pressure chamber 320 and is less than the detection pressure. In the embodiment of the present application, the second stop valve 420 and the first one-way valve 710 can replace each other in whole or in part, and the two work together to achieve the following results: In other words, when the second stop valve 420 or the first one-way valve 710 is in the cut-off state, the pressure medium cannot flow from the second pressure chamber 320 to the second end of the second pressure control valve 220. The difference between the two is that the one-way valve automatically switches between the cut-off state / on-state based on the pressure difference at its two ends, and the stop valve switches between the cut-off state / on-state based on the control of its control end. Therefore, the one-way valve has better stability and reliability, and the stop valve has more flexible control performance. It can be understood that the second one-way valve 720 can also be replaced in whole or in part by another stop valve. Furthermore, when more complex cut-off state / on-state switching is required to achieve better pressure control effect, the stop valve is preferably used. When a more stable and reliable cut-off state / on-state switching is required, the one-way valve is preferably used.

[0067] Specifically, for example, referring to Figure 7As shown, the pressure detection system includes a pressure output port 110, a pressure input port 120, a first atmospheric interface 130, a second atmospheric interface 140, a third atmospheric interface 150, a first pressure control valve 210, a second pressure control valve 220, a third pressure control valve 230, a fourth pressure control valve 240, a first pressure chamber 310, a second pressure chamber 320, a third pressure chamber 330, a first stop valve 410, a third stop valve 430, a first pressure reducer 510, a second pressure reducer 520, a first pressure measuring module 610, a second pressure measuring module 620, a third pressure measuring module 630, and a second one-way valve 720;Among them, the pressure generating device 020 is connected to the pressure input port 120, the pressure input port 120 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, the first pressure chamber 310 is connected to the pressure output port 110, during the pressure detection process, the pressure output port 110 is connected to the instrument to be tested 010, the first pressure chamber 310 is connected to the first end of the second pressure control valve 220, the second end of the second pressure control valve 220 is connected to the first end of the first stop valve 410, and the second end of the first stop valve 410 is connected to the first atmospheric interface 1 30 is connected. During the pressure detection process, the first atmospheric interface 130 is connected to the atmosphere, the first pressure chamber 310 is connected to the measuring end of the first pressure measuring module 610, the output end of the first pressure measuring module 610 is coupled to the control end of the first shut-off valve 410, the second end of the second pressure control valve 220 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510, the low-pressure end 512 of the first pressure reducer 510 is connected to the first end of the third shut-off valve 430, the second end of the third shut-off valve 430 is connected to the second atmospheric interface 140, and the first pressure measuring module 610 is connected to the measuring end of the first pressure measuring module 610. The output end of the pressure module 610 is coupled to the control end of the third stop valve 430. During the pressure detection process, the second atmospheric interface 140 is connected to the atmosphere, the second end of the second pressure control valve 220 is connected to the input end 721 of the second one-way valve 720, the output end of the second one-way valve 720 is connected to the third pressure chamber 330, the third pressure chamber 330 is connected to the high-pressure end 521 of the second pressure reducer 520, the low-pressure end 522 of the second pressure reducer 520 is connected to the third atmospheric interface 150, during the pressure detection process, the third atmospheric interface 150 is connected to the atmosphere, the pressure input port 120 is connected to the third control valve 220, and the pressure input port 120 is connected to the third control valve 220. The first end of the third pressure control valve 230 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the measuring end of the second pressure measuring module 620, the output end of the second pressure measuring module 620 is coupled to the control end of the third pressure control valve 230, the pressure input port 120 is connected to the first end of the fourth pressure control valve 240, the second end of the fourth pressure control valve 240 is connected to the third pressure chamber 330, the third pressure chamber 330 is connected to the measuring end of the third pressure measuring module 630, and the output end of the third pressure measuring module 630 is coupled to the control end of the fourth pressure control valve 240.

[0068] In the embodiment of the present application, the second stop valve 420 and the third stop valve 430 can replace each other in whole or in part. The common function of the two is that when the second stop valve 420 or the third stop valve 430 is in the cut-off state, the pipeline where the second pressure chamber 320 is located forms a closed chamber, thereby limiting the pressure medium from flowing from the second pressure chamber 320 to the second end of the second pressure controlling valve 220. The difference between the two is that when the second stop valve 420 is in the cut-off state, the pressure medium can no longer flow between the second pressure chamber 320 and the second end of the second pressure controlling valve 220. When the third stop valve 430 is in the cut-off state, the medium pressure at the second end of the second pressure controlling valve 220 can be adjusted according to the second measurement result. Therefore, based on the impact on the pressure control effect of the second pressure controlling valve 220, the setting of the second stop valve 420 has better stability, and the medium pressure of the second pressure chamber 320 is stable at the associated value of the set pressure based on the setting of the first reducing valve 510. The setting of the third stop valve 430 has better operability. It can cooperate with the third pressure control valve 230 to make the medium pressure of the second pressure chamber 320 reach a pressure above the associated value of the set pressure. Furthermore, the setting of the third stop valve 430 can also cooperate with the pipeline where the third pressure chamber 330 is located. When the third stop valve 430 is in a conducting state, the medium pressure of the third pressure chamber 330 is higher than the medium pressure of the second pressure chamber 320, and the pressure between the two is discontinuous. When the third stop valve 430 is in a cut-off state, it can be adjusted by the medium pressure of the second pressure chamber so that it gradually approaches the medium pressure of the third pressure chamber 330, thereby realizing the connection between the different pressures at the second end of the second pressure control valve 220, reducing pressure fluctuations, and improving the pressure control stability during the pressure change process. It can be understood that the second stop valve 420 and the third stop valve 430 can also be set together, so as to respectively exert their respective beneficial effects.

[0069] Exemplarily, the pressure detection system also includes: the first end of the aforementioned first pressure control valve 210 is connected to the pressure input port 120 through a pipeline, including: a fifth pressure control valve 250, the first end of the fifth pressure control valve 250 is connected to the pressure input port 120 through a pipeline, and the second end of the fifth pressure control valve 250 is connected to the first end of the first pressure control valve 210 through a pipeline; a differential pressure measuring module 650, the first end of the differential pressure measuring module 650 is connected to the first end of the first pressure control valve 210 through a pipeline, and the second end of the differential pressure measuring module 650 is connected to the second end of the first pressure control valve 210 through a pipeline, the differential pressure measuring module 650 is used to measure the pressure difference between the first end of the differential pressure measuring module 650 and the second end of the differential pressure measuring module 650, and the output end 651 of the differential pressure measuring module 650 is coupled to the control end 251 of the fifth pressure control valve 250.

[0070] Specifically, if Figure 8As shown, the pressure detection system includes a pressure output port 110, a pressure input port 120, a first atmospheric interface 130, a second atmospheric interface 140, a first pressure control valve 210, a second pressure control valve 220, a third pressure control valve 230, a fifth pressure control valve 250, a first pressure chamber 310, a second pressure chamber 320, a first stop valve 410, a first pressure reducer 510, a first pressure measuring module 610, a second pressure measuring module 620, a differential pressure measuring module 650 and a first one-way valve 710; wherein, the pressure generating device 020 is connected to the pressure input port 120, and the pressure input port 120 is connected to the fifth pressure control valve 250. The first end of the valve 250 is connected, the second end of the fifth pressure control valve 250 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, the first end of the differential pressure measuring module 650 is connected to the first end of the first pressure control valve 210, the second end of the differential pressure measuring module 650 is connected to the second end of the first pressure control valve 210, the output end 651 of the differential pressure measuring module 650 is coupled to the control end 251 of the fifth pressure control valve 250, the first pressure chamber 310 is connected to the pressure output port 110, and during the pressure detection process, the pressure output port 110 is connected to the first end of the first pressure control valve 210. The instrument to be tested 010 is connected, the first pressure chamber 310 is connected to the first end of the second pressure control valve 220, the second end of the second pressure control valve 220 is connected to the first end of the first stop valve 410, and the second end of the first stop valve 410 is connected to the first atmospheric interface 130. During the pressure detection process, the first atmospheric interface 130 is connected to the atmosphere, the first pressure chamber 310 is connected to the measuring end of the first pressure measuring module 610, the output end of the first pressure measuring module 610 is coupled to the control end of the first stop valve 410, and the second end of the second pressure control valve 220 is connected to the input end 711 of the first one-way valve 710. The output end 712 of the first one-way valve 710 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510, the low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140, the first end of the first pressure control valve 210 is connected to the first end of the third pressure control valve 230, the second end of the third pressure control valve 230 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the measuring end of the second pressure measuring module 620, and the output end of the second pressure measuring module 620 is coupled to the control end of the third pressure control valve 230.

[0071] In the embodiment of the present application, a fifth pressure control valve 250 is provided between the pressure input port 120 and the first pressure control valve 210, and a differential pressure measuring module 650 is further provided for measuring the pressure difference at both ends of the first pressure control valve 210. The differential pressure measuring module 650 is coupled to the fifth pressure control valve 250, so that the fifth pressure control valve 250 can control the switching of the cut-off state / on state of the fifth pressure control valve 250 according to the differential pressure measurement result of the differential pressure measuring module 650. For example, a pressure threshold can be set in the fifth pressure control valve 250. When the differential pressure measurement result is greater than the pressure threshold, the fifth pressure control valve 250 is controlled to be in the cut-off state, so that in the subsequent pressure control process, the pressure medium flows from the first pressure chamber 310 to the instrument to be tested 010, or the pressure medium flows from the first pressure chamber 310 of the second pressure control valve 220 to the instrument to be tested 010. The pressure medium flows from the fifth pressure control valve 250 to the first end of the first pressure control valve 210, and the differential pressure measurement result gradually increases until it is equal to the pressure threshold. In some cases, the aforementioned pressure threshold may also be a pressure range. It is understandable that the setting of the fifth pressure control valve 250 can make a preliminary adjustment to the pressure of the medium input to the pressure input port 120 according to the requirement of the detection pressure. Accordingly, the control accuracy of the first pressure control valve 210 on the medium pressure can be improved. Furthermore, based on the combination of the differential pressure measurement module 650 and the differential pressure measurement result, the fifth pressure control valve 250 can be automatically controlled.

[0072] Exemplarily, the pressure detection system also includes: at least two instrument interfaces 160 for fixedly connecting the pressure instrument 010; a pressure matching pipeline 170, the first end of the pressure matching pipeline 170 is connected to the pressure output port 110, and at least two second ends of the pressure matching pipeline 170 are respectively connected to at least two instrument interfaces 160; the capacity of the pressure matching pipeline 170 is greater than the capacity of the first pressure chamber 310.

[0073] Exemplarily, the pressure detection system also includes: a fourth pressure measuring module 650 for measuring the medium pressure, the measuring end 651 of the fourth pressure measuring module 650 is detachably connected to an instrument interface 160, and the output end 642 of the fourth pressure measuring module 650 is coupled to the control end 411 of the first shut-off valve 410.

[0074] Specifically, if Figure 9As shown, the pressure detection system includes a pressure output port 110, a pressure input port 120, a first atmospheric interface 130, a second atmospheric interface 140, an instrument interface 160, a pressure distribution pipeline 170, a first pressure control valve 210, a second pressure control valve 220, a third pressure control valve 230, a fifth pressure control valve 250, a first pressure chamber 310, a second pressure chamber 320, a first stop valve 410, a first pressure reducer 510, a second pressure measuring module 620, a fourth pressure measuring module 640, a differential pressure measuring module 650, and a pressure measuring device 660. The pressure measuring module 650 and the first one-way valve 710 are connected; wherein the pressure generating device 020 is connected to the pressure input port 120, the pressure input port 120 is connected to the first end of the fifth pressure control valve 250, the second end of the fifth pressure control valve 250 is connected to the first end of the first pressure control valve 210, the second end of the first pressure control valve 210 is connected to the first pressure chamber 310, the first end of the differential pressure measuring module 650 is connected to the first end of the first pressure control valve 210, and the differential pressure measuring module 650 is connected to the first end of the first pressure control valve 210. The second end of the differential pressure measuring module 650 is connected to the second end of the first pressure control valve 210. The output end 651 of the differential pressure measuring module 650 is coupled to the control end 251 of the fifth pressure control valve 250. The first pressure chamber 310 is connected to the pressure output port 110. The pressure output port 110 is connected to the pressure distribution pipeline 170. The pressure distribution pipeline 170 is provided with at least two instrument interfaces 160. The measuring end 641 of the fourth pressure measuring module 640 is connected to one of the instrument interfaces 160. During the pressure detection process, at least one instrument interface 160 is connected to the instrument 010 to be tested. The first pressure chamber 310 is connected to the first end of the second pressure control valve 220. The second end of the second pressure control valve 220 is connected to the first end of the first stop valve 410. The second end of the first stop valve 410 is connected to the first atmospheric interface 130. The output end 642 of the fourth pressure measuring module 640 is coupled to the control end of the first stop valve 410. During the pressure detection process, the first atmospheric interface 130 is connected to the atmosphere. The second end of the second pressure control valve 220 is connected to the input end 711 of the first one-way valve 710, the output end 712 of the first one-way valve 710 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the high-pressure end 511 of the first pressure reducer 510, the low-pressure end 512 of the first pressure reducer 510 is connected to the second atmospheric interface 140, the first end of the first pressure control valve 210 is connected to the first end of the third pressure control valve 230, the second end of the third pressure control valve 230 is connected to the second pressure chamber 320, the second pressure chamber 320 is connected to the measuring end of the second pressure measuring module 620, and the output end of the second pressure measuring module 620 is coupled to the control end of the third pressure control valve 230.

[0075] In the embodiment of the present application, by providing a pressure distribution line 170, and the capacity of the pressure distribution line 170 is greater than the capacity of the first pressure chamber 310, the influence of the medium pressure fluctuation of the first pressure chamber 310 on the medium pressure measured by the instrument to be tested 010 can be reduced, and the stability of the medium pressure at the instrument to be tested 010 can be improved, thereby improving the stability of the pressure detection result.

[0076] In some examples of the present application, the first stop valve 410 is coupled to the first pressure measuring module 610, and the on / off state switching of the first stop valve 410 is controlled according to the first measurement result. In the process of boosting, when the medium pressure of the first pressure chamber 310 reaches the pressure threshold, the first measurement result reaches the pressure threshold, and the first stop valve 410 switches from the on state to the off state. In some examples of the embodiments of the present application, since the pressure distribution pipeline 170 is set, and the capacity of the pressure distribution pipeline 170 is greater than the capacity of the first pressure chamber 310, it may occur in the aforementioned state, waiting The measuring instrument 010 may be lower than the pressure threshold. Different from these examples, in the embodiment of the present application, a fourth pressure measuring module 640 is further provided, and the fourth pressure measuring module 640 is coupled to the first stop valve 410. Since the fourth pressure measuring module 640 and the instrument to be measured 010 are both connected to the instrument interface 160, when the fourth measurement result of the fourth pressure measuring module 640 reaches the pressure threshold, the instrument to be measured 010 also reaches the pressure threshold. At this time, the on-state / off-state switching of the first stop valve 410 is controlled according to the fourth measurement result, which can improve the pressure control accuracy of the pressure detection system.

[0077] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A pressure detection system for detecting a pressure instrument, characterized in that: include: A pressure input port is used to connect a pressure generating device, wherein the medium pressure provided by the pressure generating device is higher than the detection pressure required for detecting the pressure instrument; a first pressure control valve, wherein a first end of the first pressure control valve is connected to the pressure input port through a pipeline; a first pressure chamber for accommodating a pressure medium, wherein the second end of the first pressure control valve is connected to the first pressure chamber; a second pressure control valve, wherein a first end of the second pressure control valve is connected to the first pressure chamber; a first stop valve, wherein a first end of the first stop valve is connected to a second end of the second pressure control valve through a pipeline; a first atmospheric interface, for connecting to the atmosphere, wherein the second end of the first stop valve is connected to the first atmospheric interface via a pipeline; a second pressure chamber for accommodating a pressure medium, wherein the second end of the second pressure control valve is connected to the second pressure chamber via a pipeline; The second atmospheric interface is used to connect to the atmosphere; a first pressure reducer, wherein a high-pressure end of the first pressure reducer is connected to the second pressure chamber, and a low-pressure end of the first pressure reducer is connected to the second atmospheric interface via a pipeline, a medium pressure at the high-pressure end of the first pressure reducer is higher than a medium pressure at the low-pressure end of the first pressure reducer, and a medium pressure at the high-pressure end of the first pressure reducer is lower than the detection pressure; The pressure output port is used to connect to the pressure instrument, and the pressure output port is connected to the first pressure chamber.

2. The pressure detection system according to claim 1, characterized in that: Also includes: The first pressure measuring module is used to measure the medium pressure of the first pressure chamber. The measuring end of the first pressure measuring module is connected to the first pressure chamber, and the output end of the first pressure measuring module is coupled to the control end of the first shut-off valve.

3. The pressure detection system according to claim 1, characterized in that: The second end of the second pressure control valve is connected to the second pressure chamber through a pipeline, comprising: A first one-way valve, wherein the input end of the first one-way valve is connected to the second end of the second pressure control valve through a pipeline, and the output end of the first one-way valve is connected to the second pressure chamber. When the medium pressure at the output end of the first one-way valve is higher than the medium pressure at the input end of the first one-way valve, the first one-way valve is in a cut-off state.

4. The pressure detection system according to claim 2, characterized in that: Also includes: a third pressure-controlling valve, wherein a first end of the third pressure-controlling valve is connected to a first end of the first pressure-controlling valve via a pipeline, and a second end of the third pressure-controlling valve is connected to the second pressure chamber; The second pressure measuring module is used to measure the medium pressure of the second pressure chamber. The measuring end of the second pressure measuring module is connected to the second pressure chamber, and the output end of the second pressure measuring module is coupled to the control end of the third pressure control valve.

5. The pressure detection system according to claim 1, characterized in that: Also includes: a third pressure chamber, the second end of the second pressure control valve being connected to the third pressure chamber; The third atmospheric interface is used to connect to the atmosphere; A second pressure reducer, wherein the high-pressure end of the second pressure reducer is connected to the third pressure chamber, the low-pressure end of the second pressure reducer is connected to the third atmospheric interface through a pipeline, the medium pressure at the high-pressure end of the second pressure reducer is higher than the medium pressure at the low-pressure end of the second pressure reducer, the medium pressure at the high-pressure end of the second pressure reducer is higher than the medium pressure at the high-pressure end of the first pressure reducer, and is lower than the detection pressure.

6. The pressure detection system according to claim 5, characterized in that: The second end of the second pressure control valve is connected to the third pressure chamber, comprising: a second one-way valve, wherein an input end of the second one-way valve is connected to the second end of the second pressure control valve via a pipeline, and an output end of the second one-way valve is connected to the third pressure chamber, and when the medium pressure at the output end of the second one-way valve is higher than the medium pressure at the input end of the second one-way valve, the second one-way valve is in a closed state; a fourth pressure control valve, wherein a first end of the fourth pressure control valve is connected to the first end of the first pressure control valve via a pipeline, and a second end of the fourth pressure control valve is connected to the third pressure chamber; The third pressure measuring module is used to measure the medium pressure of the third pressure chamber. The measuring end of the third pressure measuring module is connected to the third pressure chamber, and the output end of the third pressure measuring module is coupled to the control end of the fourth pressure control valve.

7. The pressure detection system according to claim 5, characterized in that: The second end of the second pressure control valve is connected to the second pressure chamber via a pipeline, including: the second end of the second pressure control valve is connected to the first end of the second stop valve via a pipeline, the second end of the second stop valve is connected to the second pressure chamber, and the control end of the second stop valve is coupled to the output end of the first pressure measuring module, and the first pressure measuring module is used to measure the medium pressure of the first pressure chamber; or, The low-pressure end of the first pressure reducer is connected to the second atmospheric interface through a pipeline, including: the low-pressure end of the first pressure reducer is connected to the first end of the third stop valve through a pipeline, the second end of the third stop valve is connected to the second atmospheric interface through a pipeline, and the control end of the third stop valve is coupled to the output end of the first pressure measuring module, and the first pressure measuring module is used to measure the medium pressure of the first pressure chamber.

8. The pressure detection system according to claim 1, characterized in that: The first end of the first pressure control valve is connected to the pressure input port through a pipeline, comprising: a fifth pressure-controlling valve, wherein a first end of the fifth pressure-controlling valve is connected to the pressure input port via a pipeline, and a second end of the fifth pressure-controlling valve is connected to the first end of the first pressure-controlling valve via a pipeline; A differential pressure measuring module, wherein the first end of the differential pressure measuring module is connected to the first end of the first pressure control valve via a pipeline, and the second end of the differential pressure measuring module is connected to the second end of the first pressure control valve via a pipeline. The differential pressure measuring module is used to measure the pressure difference between the first end of the differential pressure measuring module and the second end of the differential pressure measuring module, and the output end of the differential pressure measuring module is coupled to the control end of the fifth pressure control valve.

9. The pressure detection system according to claim 1, characterized in that: Also includes: At least two instrument interfaces for fixedly connecting the pressure instrument; a pressure distribution pipeline, wherein a first end of the pressure distribution pipeline is connected to the pressure output port, and at least two second ends of the pressure distribution pipeline are respectively connected to the at least two instrument interfaces; The capacity of the pressure distribution pipeline is greater than the capacity of the first pressure chamber.

10. The pressure detection system according to claim 9, characterized in that: Also includes: The fourth pressure measuring module is used to measure the medium pressure. The measuring end of the fourth pressure measuring module is detachably connected to one of the instrument interfaces. The output end of the fourth pressure measuring module is coupled to the control end of the first shut-off valve.

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