Pressure control method, detection host and pressure control device

Abstract

The application provides a pressure control method applied to a pressure detection system, the pressure detection system comprising a pressure controller and a gas-liquid separator, and the method comprises the following steps: controlling the pressure controller to generate pressure; when the detection pressure reaches a first pressure threshold, controlling the pressure controller to stop generating pressure; when the detection pressure is between the first pressure threshold and a second pressure threshold, controlling the gas-liquid separator to periodically discharge liquid with a small time proportion, and the first pressure threshold is greater than the second pressure threshold; and when the detection pressure is less than the second pressure threshold, controlling the gas-liquid separator to periodically discharge liquid with a large time proportion. On the one hand, the small liquid discharge period time proportion ensures the safety of liquid discharge under a large detection pressure; on the other hand, the large liquid discharge period time proportion improves the liquid discharge efficiency under a small detection pressure, and the safe and efficient discharge of the liquid working medium is realized.

Description

Technical Field

[0001] This application relates to the field of pressure detection technology, specifically, a pressure control method that coordinates with the drainage process before and after pressure detection, and a detection host and pressure control device for implementing the pressure control method. Background Technology

[0002] A pressure instrument may be one of the instruments or devices with pressure measurement capabilities, such as a pressure gauge, pressure switch, pressure transmitter, or differential pressure flow meter, or it may be a pressure measurement component used in other equipment, such as a pressure module or pressure sensor. When testing a pressure instrument, a test pressure source is required. This test pressure source may be a pressure controller or other similar pressure testing device. During the testing process, the test pressure source and the pressure instrument under test are in a connected state, and the working medium can be transferred between them through a connecting pipeline.

[0003] In some cases, the pressure source uses a gaseous working medium as a carrier to output the test pressure. In contrast, the pressure instrument under test may be used to measure the pressure of a liquid working medium or a gas-liquid mixture before testing. In this case, the residual liquid working medium in the pressure instrument under test may also be transmitted into the pressure source through the aforementioned connecting pipeline. This situation may affect the control accuracy of the pressure source and may even directly damage important pressure control components such as pressure control valves.

[0004] In the process of realizing this application, the inventors discovered that by using a gas-liquid separator to connect the detection pressure source and the pressure gauge under test, the gas-liquid separation of the working medium can be achieved. However, the general gas-liquid separation process only transfers the liquid discharge process. After the gas-liquid separator has been working for a period of time, it still faces the problem of discharging the liquid working medium. The existing technology does not have a safe and efficient method for discharging liquid. Summary of the Invention

[0005] The technical problem to be solved is how to safely and efficiently achieve gas-liquid separation and discharge the liquid working medium.

[0006] This application provides a pressure control method applied to a pressure detection system. The pressure detection system includes a pressure controller and a gas-liquid separator. The pressure controller outputs the detection pressure using a gaseous working medium, and the gas-liquid separator is used to separate the gaseous working medium and the liquid working medium during the transmission of the detection pressure. The pressure control method includes:

[0007] The pressure controller is controlled to generate pressure, so that the pressure controller outputs the gas working medium, and the detected pressure tends to a first pressure threshold.

[0008] When the detected pressure reaches the first pressure threshold, the pressure controller is controlled to stop generating pressure.

[0009] When the detected pressure is between the first pressure threshold and the second pressure threshold, the gas-liquid separator is controlled to perform periodic liquid discharge at a small time ratio, and the first pressure threshold is greater than the second pressure threshold.

[0010] When the detected pressure is less than the second pressure threshold, the gas-liquid separator is controlled to perform periodic liquid discharge at a larger time ratio.

[0011] Preferably, the pressure detection system further includes a pressure measurement module and a main control module. The pressure controller includes a first detection pressure output port, and the pressure controller outputs the detection pressure as a gaseous working medium at least through the first detection pressure output port. The gas-liquid separator includes a first detection pressure interface, a first gas-liquid separation chamber, a first tested pressure interface, a first drain port, and a first drain valve. The first gas-liquid separation chamber is connected to the first detection pressure interface at a first position, connected to the first tested pressure interface at a second position, and connected to the first drain port at a third position, with the first position being higher than the third position. The first drain valve is connected to the first drain port and is used to control the opening and closing of the first drain port. The first detection pressure interface is connected to the first detection pressure output port. The first tested pressure interface is used to connect to the pressure measurement port of the tested pressure instrument. The pressure measurement module is connected to the first detection pressure output port and is used to measure the detection pressure. The main control module is connected to the pressure controller, the gas-liquid separator, and the pressure measurement module. The pressure control method includes: the main control module obtaining the pressure measurement value of the detection pressure from the pressure measurement module; The control of the pressure controller to generate pressure includes: the main control module sending a first pressure control signal to the pressure controller, causing the pressure controller to output the gaseous working medium at a first output rate; controlling the pressure controller to stop generating pressure includes: when the pressure measurement value reaches a first pressure threshold, the main control module sending a stop pressure generation signal to the pressure controller, causing the pressure controller to stop outputting the gaseous working medium; controlling the gas-liquid separator to perform periodic drainage at a small time ratio includes: when the pressure measurement value is less than the first pressure threshold and greater than a second pressure threshold, ... The main control module sends a first discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a first duty cycle. When powered on, the first discharge valve is in the open state, and the working medium in the first gas-liquid separation chamber is discharged through the first discharge port. The first duty cycle is less than or equal to a first proportional threshold. Controlling the gas-liquid separator to perform periodic discharge at a larger time ratio includes sending a second discharge signal to the gas-liquid separator when the pressure measurement value is less than the second pressure threshold, causing the first discharge valve to periodically open and close according to a second duty cycle, where the second duty cycle is greater than the first duty cycle.

[0012] Preferably, the product of the first pressure threshold and the first duty cycle is less than or equal to twice the product of the second pressure threshold and the second duty cycle, and greater than or equal to half the product of the second pressure threshold and the second duty cycle.

[0013] Preferably, the processing of the pressure measurement value includes processing the pressure measurement value at at least two time points to obtain a first pressure change rate; when the first pressure change rate is less than or equal to a first change threshold, sending a second pressure control signal to the pressure controller, so that the pressure controller outputs the gas working medium at a second output rate.

[0014] Preferably, the processing of the pressure measurement value includes: when the first pressure change rate is greater than or equal to the second change threshold, sending a stop pressure generation signal to the pressure controller, wherein the second change threshold is greater than the first change threshold; when the first pressure change rate is greater than the first change threshold and less than the second change threshold, sending a third pressure control signal to the pressure controller, causing the pressure controller to output the gas working medium at a third output rate, wherein the third output rate is less than the second output rate.

[0015] Preferably, when the liquid working medium is discharged from the first drain port, the pressure measurement values ​​at the at least two times are obtained to determine the first change threshold; when the gaseous working medium is discharged from the first drain port, the pressure measurement values ​​at the at least two times are obtained to determine the second change threshold.

[0016] Preferably, the processing of the pressure measurement value includes: when the first pressure change rate is less than or equal to the first change threshold and the pressure measurement value is less than or equal to the third pressure threshold, sending a third discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a third duty cycle; when the first pressure change rate is less than or equal to the first change threshold and the pressure measurement value is greater than the third pressure threshold, sending a fourth discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a fourth duty cycle, wherein the fourth duty cycle is greater than the third duty cycle.

[0017] Preferably, the third pressure threshold is determined based on the cumulative drainage time of the gas-liquid separator, and the longer the cumulative drainage time, the smaller the third pressure threshold.

[0018] Preferably, when the pressure measurement value is less than or equal to the first pressure threshold and greater than the second pressure threshold, the fourth duty cycle is greater than the first duty cycle; when the pressure measurement value is less than or equal to the second pressure threshold, the third duty cycle is less than the second duty cycle.

[0019] Preferably, the gas-liquid separator further includes a drain pump, the inlet of which is connected to the first drain valve, and the outlet of which is used to discharge the working medium. The pressure control method includes at least partially generating a drain control signal simultaneously, the main control module sending a pump control signal to the gas-liquid separator, so that the drain pump drives the working medium from the inlet to the outlet. The drain control signal includes a first drain signal and a second drain signal.

[0020] Preferably, the processing of the pressure measurement value includes: when the pressure measurement value reaches zero pressure for the first time, sending a fifth discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a fifth duty cycle; at least partially simultaneously with generating the fifth discharge signal, sending a pump control signal to the gas-liquid separator, causing the detected pressure to tend towards a negative pressure value; when the pressure measurement value reaches a fourth pressure threshold, sending a pump stop signal to the gas-liquid separator, causing the discharge pump to shut down, and the fourth pressure threshold to be less than zero pressure; when the pressure measurement value is less than zero pressure, sending a fourth pressure control signal to the gas-liquid separator, causing the pressure controller to output the gas working medium according to a fourth output rate, and the detected pressure to tend towards zero pressure; when the pressure measurement value reaches zero pressure for the second time, sending a stop pressure generation signal to the pressure controller; when the pressure measurement value reaches zero pressure for the second time, sending a stop discharge signal to the gas-liquid separator, causing the first discharge valve to remain normally closed.

[0021] Preferably, the fourth output rate is less than the first output rate.

[0022] Preferably, the pressure controller further includes a second pressure detection output port. The pressure controller outputs differential pressure through the first pressure detection output port and the second pressure detection output port. The gas-liquid separator further includes a second pressure detection interface, a second gas-liquid separation chamber, a second pressure-detected interface, a second drain port, and a second drain valve. The second gas-liquid separation chamber is connected to the second pressure detection interface at a fourth position, to the second pressure-detected interface at a fifth position, and to the second drain port at a sixth position. The fourth position is higher than the sixth position. The second drain valve is connected to the second drain port for controlling the... The second drain port is switched on and off. The inlet of the drain pump is also connected to the second drain valve. The second detection pressure interface is connected to the second detection pressure output port. The first detected pressure interface is used to connect to another pressure measurement port of the detected pressure instrument. The pressure control method includes at least partially generating the first drain signal simultaneously. The main control module sends a sixth drain signal to the gas-liquid separator, causing the second drain valve to periodically open and close according to a sixth duty cycle. The sixth duty cycle is greater than the first duty cycle. When the first drain valve is in the open state, the second drain valve is in the closed state.

[0023] Preferably, the sixth duty cycle is determined based on the cumulative drainage time of the gas-liquid separator, and the longer the cumulative drainage time, the smaller the difference between the sixth duty cycle and the first duty cycle.

[0024] This application also provides a detection host for pressure detection. The detection host includes a main control module, a first connection module, and a second connection module. The main control module is connected to the first connection module and the second connection module. The first connection module is used to connect to a pressure controller, which outputs a detection pressure as a gaseous working medium at least through a first detection pressure output port. The second connection module is used to connect to a gas-liquid separator, which separates the gaseous working medium and the liquid working medium during the detection pressure output process. The main control module is configured to: acquire the pressure measurement value of the detection pressure from the first connection module; and send a pressure control signal to the first connection module to control the pressure controller, such that the pressure... The controller outputs the working gas medium, and the detected pressure tends towards a first pressure threshold. When the pressure measurement value reaches the first pressure threshold, a stop pressure generation signal is sent to the first connection module to control the pressure controller, causing the pressure controller to stop generating pressure. When the pressure measurement value is between the first pressure threshold and the second pressure threshold, a first drain signal is sent to the second connection module to control the gas-liquid separator, causing the gas-liquid separator to perform periodic draining at a relatively small time ratio, where the first pressure threshold is greater than the second pressure threshold. When the pressure measurement value is less than the second pressure threshold, a second drain signal is sent to the second connection module, causing the gas-liquid separator to perform periodic draining at a relatively large time ratio.

[0025] This application also provides a pressure control device for pressure detection. The pressure control device includes a pressure control mechanism, a main control module, a pressure measurement module, and a main communication module. The pressure control mechanism outputs a detection pressure via a gaseous working medium through at least a first detection pressure output port. The pressure measurement module is connected to the first detection pressure output port and is used to measure the detection pressure and generate a pressure measurement value. The main control module is connected to the pressure control mechanism, the pressure measurement module, and the main communication module. The first detection pressure output port is used to connect to a first detection pressure interface of a gas-liquid separator. The main communication module is used to communicate with the gas-liquid separator. The main control module is configured to: acquire the pressure measurement value from the pressure measurement module; and send a pressure control signal to the pressure control mechanism for... The pressure control mechanism is controlled such that the first pressure detection output port outputs the gas working medium, and the detected pressure tends towards a first pressure threshold. When the pressure measurement value reaches the first pressure threshold, a stop pressure generation signal is sent to the pressure control mechanism to control the pressure control mechanism, causing the pressure controller to stop pressure generation. When the pressure measurement value is between the first pressure threshold and the second pressure threshold, a first drain signal is sent to the main communication module to control the gas-liquid separator, causing the gas-liquid separator to perform periodic draining at a small time ratio, where the first pressure threshold is greater than the second pressure threshold. When the pressure measurement value is less than the second pressure threshold, a second drain signal is sent to the main communication module, causing the gas-liquid separator to perform periodic draining at a larger time ratio.

[0026] Beneficial effects:

[0027] By using a certain detection pressure, the discharge of liquid working medium is effectively promoted. On the one hand, by using a smaller discharge cycle time ratio, the discharge safety under a larger detection pressure is ensured. On the other hand, by using a larger discharge cycle time ratio, the discharge efficiency under a smaller detection pressure is improved. By controlling the detection pressure, safe and efficient discharge of liquid working medium is achieved. Attached Figure Description

[0028] Figure 1 This is a flowchart illustrating a pressure control method as an example.

[0029] Figure 2 This is a three-dimensional schematic diagram of a gas-liquid separation device as an example.

[0030] Figure 3 This is a schematic cross-sectional view of the first gas-liquid separation chamber of the gas-liquid separation device as an example.

[0031] Figure 4 The diagram shows a cross-sectional view of the first and second gas-liquid separation chambers of the gas-liquid separation device as an example.

[0032] Figure 5 This is a schematic diagram of the structure of the device base as an example.

[0033] Figure 6 This is a schematic diagram of the pipeline connection of an example gas-liquid separation device.

[0034] Figure 7 This is a schematic diagram of the system connection of a gas-liquid separation device as an example.

[0035] Figure 8 This is a schematic diagram showing the pipeline connection between a pressure detection system and the pressure gauge being tested, as an example.

[0036] Figure 9 This is a schematic diagram of the system connections for an example pressure detection system.

[0037] Figure 10 This is a flowchart illustrating the pressure control method during the pre-drainage stage, as an example.

[0038] Figure label:

[0039] 100. Air pump; 110. Initial pressure output port; 200. Pressure controller; 210. Initial pressure input port; 221. First pressure control valve; 222. Second pressure control valve; 223. Third pressure control valve; 224. Fourth pressure control valve; 230. Pressure regulator; 240. Atmospheric pressure module; 251. First pressure detection output port; 252. Second pressure detection output port; 260. Main control module; 270. Main communication module; 280. Pressure measurement module; 300. Gas-liquid separator; 3 10. First separation tube body; 311. First gas-liquid separation chamber; 320. Second separation tube body; 321. Second gas-liquid separation chamber; 330. Device base; 331. First base side; 332. Second base side; 340. Device top seat; 341. First top seat side; 342. Second top seat side; 351. First pressure detection interface; 352. Second pressure detection interface; 353. First pressure under test interface; 354. Second pressure under test interface; 361. First drain port; 362. 363, 364, 365, 366, 367, 368, 371, 372, 373, 374, 380, 381, 382, ​​390, 391, 392, 393, 394, 395, 396, 397, 388, 399, 390, 391, 392, 393, 394, 395, 396, 397, 398, 39 ... 2. Second internal air inlet, 410. First drain valve, 411. First valve passage end, 412. Second valve passage end, 420. Second drain valve, 421. Third valve passage end, 422. Fourth valve passage end, 430. Drain pump, 431. Inlet pump port, 432. Outlet pump port, 440. Drain controller, 450. Drain communication module, 460. Control panel, 470. Battery module, 500. Pressure gauge under test, 510. High pressure measuring port, 520. Low pressure measuring port.

[0040] Specific implementation method

[0041] The technical solutions of this application are described below based on the embodiments. However, the technical solutions of this application are not limited to these embodiments. In the detailed description of the technical solutions below, some specific details are described in detail. It should be understood that these details are not a limitation on the scope of protection of this application. For those skilled in the art, this application can be fully understood without the description of these details. It can also be understood that these details are based on non-creative modifications, obvious changes, and substitutions of conventional technical means in the prior art.

[0042] This embodiment provides the main feasible solutions and improved solutions to the main feasible solutions. It is understood that the main feasible solutions can solve the technical problem independently, and the improved solutions can solve the technical problem better or solve new technical problems. The combination of some improved solutions can solve the technical problem better or solve new technical problems. All of these feasible combinations are within the scope of the content disclosed in this embodiment.

[0043] like Figure 1 As shown, a pressure control method is applied to a pressure detection system. The pressure detection system includes a pressure controller and a gas-liquid separator. The pressure controller outputs the detection pressure with a gaseous working medium, and the gas-liquid separator is used to separate the gaseous working medium and the liquid working medium during the output of the detection pressure.

[0044] This embodiment provides a pressure control method. In some cases, this pressure control method can be used before pressure detection. After the pressure controller obtains the target pressure value, it will prompt or automatically determine whether pre-drainage is required. If pre-drainage is required, the pressure control method of this embodiment is performed before pressure detection. In other cases, this pressure control method can also be used after pressure detection. For example, after the pressure controller has completed the control of all target pressure values, it will prompt or automatically determine whether post-detection drainage is required. If post-detection drainage is required, the pressure control method of this embodiment is performed after pressure detection.

[0045] The pressure control method of this embodiment includes:

[0046] S101, control the pressure controller 200 to generate pressure, so that the pressure controller 200 outputs gas working medium, and detects the pressure tending to the first pressure threshold.

[0047] In some cases, S101 is usually executed first. Specifically, taking the pre-drainage mode as an example, before pre-drainage, preparations such as connecting the pressure transmission pipeline have been completed, and the system is in a state where pressure detection is required and can be performed. The first controlled object in the pre-drainage mode is the pressure controller 200, and its first action is pressure building. This pressure building process does not require special control requirements; it can be performed according to the normal pressure building method of the pressure controller 200. During the pressure building process, the pressure controller 200 continuously outputs the gaseous working medium. In terms of the detected pressure, as the amount of gaseous working medium gradually increases, the detected pressure gradually increases and changes towards the first pressure threshold.

[0048] S201. When the detected pressure reaches the first pressure threshold, control the pressure controller 200 to stop pressurizing.

[0049] In some cases, S201 generally occurs after S101 has been executed for a period of time. As mentioned above, during S101, the detection pressure gradually increases. Therefore, in S201, the detection pressure is monitored. When the detection pressure reaches the first pressure threshold, the pressure controller 200 stops pressurizing. Without the addition of gas working medium, the detection pressure will not continue to increase. In some cases, S201 is not a step with a fixed execution order, but a step triggered by conditions. It is understandable that before the detected pressure reaches the first pressure threshold for the first time, the working medium will not be transmitted outwards because the pressure transmission pipeline is sealed. Therefore, the detected pressure is a continuously rising process. After the detected pressure reaches the first pressure threshold for the first time, due to the existence of the subsequent two triggering conditional processes S301 and S302, the detected pressure will gradually decrease. Combined with other subsequent schemes in this embodiment, it can be seen that under some triggering conditions, the pressure controller 200 may continue to build pressure for a period of time. If this is done, if the subsequent pressure building rate is less than the discharge rate of the working medium in S301, S302, or other similar steps, S201 will not be triggered again. If the subsequent pressure building rate is greater than the discharge rate of the working medium in S301, S302, or other similar steps, S201 will be triggered again when the detected pressure reaches the first pressure threshold.

[0050] S301. When the detected pressure is between the first pressure threshold and the second pressure threshold, the gas-liquid separator 300 is controlled to perform periodic liquid discharge at a small time ratio, where the first pressure threshold is greater than the second pressure threshold.

[0051] S302. When the detected pressure is less than the second pressure threshold, control the gas-liquid separator 300 to perform periodic liquid discharge at a larger time ratio.

[0052] In some cases, S301 will be triggered simultaneously with S201 because they share the same edge condition: the detection pressure reaches the first pressure threshold. Due to the presence of S201, the detection pressure will not rise. Due to the presence of S301, the working medium (which may be a gaseous working medium, a liquid working medium, or a mixed working medium) will be discharged from the gas-liquid separator, thereby reducing the detection pressure. Correspondingly, after executing S301 for a period of time, the trigger condition of S302 will be met, which is that the detection pressure is less than the second pressure threshold, and S302 will be triggered.

[0053] Since the gas-liquid separator is part of the pipeline that transmits the detection pressure, after the S101 process is executed, the pressure inside the gas-liquid separator is generally greater than that of the outside atmosphere. This causes the working medium to form a discharge pressure difference near the drain port of the gas-liquid separator. This discharge pressure difference can push the working medium (including the liquid working medium if present) to be discharged quickly from the gas-liquid separator, achieving the purpose of rapid liquid discharge.

[0054] Theoretically, the greater the testing pressure, the greater the aforementioned pressure difference in the discharge, and the faster the discharge speed. This pursuit of higher pressure and testing safety are sometimes contradictory. Generally, the pressure during the pressure testing process can reach 10MPa or even higher, and even the lower pressure can reach about 1MPa, which is on the same or higher order of magnitude as the pressure of a high-pressure water gun. If the liquid working medium is discharged at this pressure, it may pose a safety risk to the testing personnel.

[0055] S301 and S302 avoid the aforementioned risks. For example, the first pressure threshold can be 2 MPa or even higher. In S301, drainage begins. Due to the large drainage pressure difference, the liquid working medium flows rapidly out of the gas-liquid separator with a high instantaneous velocity and flow rate. Since the liquid discharge from the gas-liquid separator is through a pipeline, the liquid working medium does not immediately fly out of the gas-liquid separator but moves a certain distance in the drainage pipeline. Because drainage in S301 is performed periodically at a small time ratio—that is, there are multiple consecutive drainage cycles—with only a small proportion of time in each drainage cycle being in the drainage state, and a longer proportion of time before and after the drainage state being in the non-drainage state, the liquid working medium from the previous cycle moves a longer distance in the drainage pipeline. Because of the large proportion of non-drainage time, the liquid working medium in the next cycle can catch up with the previous cycle's liquid working medium. At this time, the liquid working medium in the next cycle also loses its original high velocity. Therefore, when the liquid working medium is finally discharged from the gas-liquid separator, there is no possibility of high-pressure jetting, ensuring personnel safety. In S302, due to the existence of a small drainage pressure difference, the instantaneous velocity and instantaneous flow rate of the liquid working medium are relatively small. Correspondingly, in S302, the periodic drainage is carried out with a large proportion of time. That is, a large proportion of time in each drainage cycle is in the drainage state. This allows the liquid working medium of the previous cycle to catch up with the liquid working medium of the next cycle after a very short distance in the drainage pipeline, thus ensuring the outflow velocity of the liquid working medium. At the same time, due to the corresponding low pressure value, there is no risk to personnel.

[0056] It should be noted that the above process only provides one possible combination order of S101, S201, S301 and S302. This combination order is not limited. In other cases, S201, S301 and S302 may have other possible combinations with other execution steps.

[0057] like Figures 2 to 9 As shown, the pressure detection system includes a pressure controller and a gas-liquid separator.

[0058] For example, in one case, the pressure controller includes a pressure output port 251, a pressure control mechanism, a first control module 260, and a first communication module 270. The pressure control mechanism consists of a pressure transmission pipeline and multiple pressure control valves distributed in the pressure transmission pipeline. By controlling the multiple pressure control valves, the gas working medium flowing through the pressure transmission pipeline can be controlled, thereby ensuring that the output gas working medium meets certain detection pressure requirements. Specifically, in some cases, the pressure control mechanism may include an initial pressure pump; in other cases, the initial pressure pump 100 is external. The corresponding initial pressure pump 100 includes an initial pressure output port 110. The pressure control mechanism includes an initial pressure valve 221, a pressure vessel 230, a pressure coarse adjustment valve 222, and a pressure... The fine-tuning valve 223 and the pressure measurement module 280 are connected. The initial pressure pump 100 outputs initial pressure through the initial pressure output port 110, which is connected to the initial pressure input port 210. The initial pressure input port 210 is connected to one valve passage of the initial pressure valve 221. The other valve passage of the initial pressure valve 221 is connected to the pressure vessel 230. The other valve passage of the initial pressure valve 221 and the pressure vessel 230 are also connected to one valve passage of the pressure coarse-tuning valve 222. The other valve passage of the pressure coarse-tuning valve 222 is connected to one valve passage of the pressure fine-tuning valve 223. The other valve passage of the pressure fine-tuning valve 223 is connected to the pressure output port 251. The pressure measurement module 280 is also connected to the pressure output port 251. The first control module 260 is connected to the initial pressure valve 221, the coarse pressure adjustment valve 222, the fine pressure adjustment valve 223, and the pressure measurement module 280. Based on the pressure measurement information fed back by the pressure measurement module 280, the first control module 260 controls the initial pressure valve 221, the coarse pressure adjustment valve 222, and the fine pressure adjustment valve 223 to make the detected pressure value, that is, the pressure measurement information fed back by the pressure module, reach the target pressure value. The first communication module 270 is connected to the first control module 260. Through the first communication module 270, the first control module 260 can send and receive information.

[0059] For example, the gas-liquid separator includes a first gas-liquid separation chamber 311, a first pressure-tested interface 353, a first pressure-detecting interface 351, a first air intake pipe 380, and a liquid discharge mechanism.

[0060] The first gas-liquid separation chamber 311 includes a chamber capable of containing a liquid working medium; in some cases, the first gas-liquid separation chamber is in a closed state in all locations except for specific locations or components that are clearly connected to it.

[0061] The first pressure-tested interface 353 is used to connect to the pressure gauge under test. This connection means that during the testing process, the first pressure-tested interface and the pressure measurement interface of the pressure gauge are connected. Simultaneously, the area surrounding the first pressure-tested interface is sealed, ensuring that, on the one hand, the test pressure can be transmitted to the pressure gauge through the first pressure-tested interface, and on the other hand, no leakage of test pressure occurs near the first pressure-tested interface. The first pressure-tested interface is connected to the first gas-liquid separation chamber. Therefore, the gaseous working medium carrying the test pressure enters the first gas-liquid separation chamber and then the first pressure-tested interface. Simultaneously, the liquid medium from the pressure gauge under test enters the first gas-liquid separation chamber after passing through the first pressure-tested interface.

[0062] The first detection pressure interface 351 is used to connect to a detection pressure source. Connecting to the detection pressure source means that during the detection process, the first detection pressure interface is connected to the pressure output port of the detection pressure source. Simultaneously, the area surrounding the first detection pressure interface is sealed, ensuring that, on the one hand, the detection pressure from the detection pressure source can enter the first gas-liquid separation chamber through the first detection pressure interface; on the other hand, the detection pressure will not leak near the first detection pressure interface. The detection pressure source generates detection pressure through a gaseous working medium. Generally, the detection pressure source includes a pressure control mechanism, a detection controller, and a pressure output port. The detection controller controls the pressure control mechanism, which includes several pressure control valves to control the gaseous working medium flowing through it. The pressure output port outputs the controlled gaseous working medium, i.e., the detection pressure.

[0063] The first inner air intake port 382 of the first air intake tube 380 is connected to the first gas-liquid separation chamber 311, and the first outer air intake port 381 of the first air intake tube 380 is connected to the first pressure detection interface 351. Specifically, as a component of a tube structure, the first air intake tube includes two ports in different positions. One port is located at one position of the first air intake tube and is connected to the first gas-liquid separation chamber, while the other port is located at another position of the first air intake tube and is connected to the first pressure detection interface. The interior of the first air intake tube has a connection between the first inner air intake port and the first outer air intake port. The built-in tube body, understandably, is located between the first internal air intake port and the first external air intake port, the inner and outer sides of the first air intake tube are not directly connected; in some cases, the first internal air intake port is opened on the side wall of the first gas-liquid separation chamber, in some cases, the first air intake tube is at least partially inserted into the first gas-liquid separation chamber, and the first internal air intake port is opened on the first air intake tube located in the first gas-liquid separation chamber; in some cases, the first external air intake port is connected to the first detection pressure interface through other connecting structures, and in some cases, the first external air intake port is directly connected to the first detection pressure interface.

[0064] The draining mechanism includes a draining pipeline, a first draining valve 410, a draining pump 430, and a second control module 440. The first draining port 361 of the draining pipeline is connected to the first gas-liquid separation chamber 311, and the second draining port 362 of the draining pipeline is used to discharge the liquid working medium. The first valve passage end 411 of the first draining valve 410 is connected to the first draining port 361, the second valve passage end 412 of the first draining valve 410 is connected to the inlet pump port 431 of the draining pump 430, and the outlet pump port 432 of the draining pump 430 is connected to the second draining port 362. The second control module 440 is connected to the first draining valve 410 and the draining pump 430 and is used to control the operation of the first draining valve and the draining pump.

[0065] The drainage pipeline includes at least two ports and a pipeline structure connecting the at least two ports. Specifically, the drainage pipeline includes a first drainage port, a second drainage port, and a connecting pipeline connecting the first drainage port and the second drainage port. Through the drainage pipeline, the first drainage port is connected to the first valve passage end of the first drainage valve, the second valve passage end of the first drainage valve is connected to the inlet of the drainage pump, and the outlet of the drainage pump is connected to the second drainage port.

[0066] The second control module is connected to the first drain valve and the drain pump. Through this connection, the second control module can send control signals to the first drain valve and the drain pump, which can switch the first drain valve between open and closed states, and can also switch the drain pump between start and stop states.

[0067] In the working state, the position of the first internal air intake port 382 is higher than the position of the first drain port 361.

[0068] For example, during pressure testing, the first pressure testing interface is connected to the pressure output port of the pressure controller, and the first pressure under test interface is connected to the pressure gauge under test. When a test pressure is required, the second control module controls the first drain valve to be closed and the drain pump to be stopped. The gas-liquid separator is sealed in the area outside the first pressure testing interface and the first pressure under test interface. At this time, if the pressure controller outputs a working gaseous medium loaded with the test pressure, the working gaseous medium reaches the first external air inlet through the first pressure testing interface, then enters the first air inlet pipe through the first external air inlet pipe, passes through the first air inlet pipe, reaches the first internal air inlet pipe, flows out from the first internal air inlet pipe, enters the first gas-liquid separation chamber, enters the first pressure under test interface from the first gas-liquid separation chamber, and finally reaches the pressure gauge under test through the first pressure under test interface. The pressure gauge under test measures the test pressure. Simultaneously with the aforementioned pressure transmission process, liquid working medium may remain in the pressure gauge under test. This liquid working medium flows into the first gas-liquid separator through the first pressure under test interface. Inside the cavity, under the influence of gravity, the liquid working medium falls downwards to the bottom of the first gas-liquid separation chamber, accumulating at the first drain pipe inlet. Since the first inner air inlet is higher than the first drain pipe inlet, and the first outer air inlet and other parts of the first air inlet are not directly connected to the first gas-liquid separation chamber, nor is the first pressure detection port directly connected, the liquid working medium does not enter the first air inlet, thus achieving gas-liquid separation. Subsequently, after completing the pressure detection process, the second... The controller controls the first drain valve to be open and the drain pump to be started. The suction force of the drain pump is transmitted to the first drain port through the drain pipeline, thereby drawing the liquid working medium into the drain pipeline. The liquid working medium passes through the first drain port, a part of the drain pipeline, the first drain valve, and another part of the drain pipeline to reach the drain pump. It is then discharged from the outlet of the drain pump to the second drain port. Finally, it is discharged from the second drain port to the outside of the gas-liquid separator, thus achieving the result of removing the liquid working medium from the detection pressure transmission pipeline.

[0069] In some cases, the gas-liquid separator also includes a second gas-liquid separation chamber 321, a second pressure-tested interface 354, a second pressure-detecting interface 352, and a second air inlet pipe 390. The drain structure also includes a second drain valve 420.

[0070] The second gas-liquid separation chamber 321 includes a chamber capable of containing a liquid working medium. In some cases, the second gas-liquid separation chamber is in a closed state except for specific locations or components that are clearly connected to it. In some cases, the structure of the second gas-liquid separation chamber may be partially the same as or completely identical to the structure of the first gas-liquid separation chamber. In some cases, the volumes of the second gas-liquid separation chamber and the first gas-liquid separation chamber may be the same or differ to some extent. Based on the foregoing embodiments, it can be understood that the first gas-liquid separation chamber and the second gas-liquid separation chamber are two independent gas-liquid separation chambers.

[0071] The second pressure testing interface 354 is used to connect to the pressure gauge under test. This connection means that during the testing process, the second pressure testing interface and the pressure measurement interface of the pressure gauge are connected. Simultaneously, the area surrounding the second pressure testing interface is sealed, ensuring that the test pressure can be transmitted to the pressure gauge through the second pressure testing interface while preventing leakage of the test pressure near the second pressure testing interface. The second pressure testing interface and the first pressure testing interface are connected to the same pressure gauge. In some cases, the pressure gauge is a differential pressure gauge with two pressure measurement ports. The first pressure testing interface is connected to one of these ports, and the second pressure testing interface is connected to the other. The second pressure testing interface is connected to the second gas-liquid separation chamber. Therefore, the gaseous working medium carrying the test pressure enters the second gas-liquid separation chamber and then the second pressure testing interface. Simultaneously, the liquid medium from the pressure gauge under test enters the second gas-liquid separation chamber after passing through the second pressure testing interface.

[0072] The second detection pressure interface 352 is used to connect to the detection pressure source. Connecting to the detection pressure source means that during the detection process, the second detection pressure interface is connected to the pressure output port of the detection pressure source. Simultaneously, the area surrounding the second detection pressure interface is sealed, ensuring that, on the one hand, the detection pressure from the detection pressure source can enter the second gas-liquid separation chamber through the second detection pressure interface; on the other hand, the detection pressure will not leak near the second detection pressure interface. In this embodiment, if the pressure instrument under test is a differential pressure instrument, then the corresponding output of the detection pressure source is the differential pressure detection pressure. That is, at this time, the detection pressure source outputs the detection pressure through two pressure output ports: the first detection pressure interface is connected to one of the pressure output ports, and the second detection pressure interface is connected to the other pressure output port. More specifically, there is a corresponding relationship between the pressure measurement port, the pressure interface under test, the detection pressure interface, and the pressure output port of the pressure instrument under test. For example, if the high-pressure measurement port is connected to the first pressure interface under test, then the low-pressure measurement port is connected to the second pressure interface under test; the high-pressure output port is connected to the first detection pressure interface, and the low-pressure output port is connected to the second detection pressure interface.

[0073] The second inner air inlet 392 of the second air inlet tube 390 is connected to the second gas-liquid separation chamber 321, and the second outer air inlet 391 of the second air inlet tube 390 is connected to the second pressure detection interface 352. Specifically, as a tube structure component, similar to the first air inlet tube, the second air inlet tube also includes two inlets in different positions, namely, a second inner air inlet and a second outer air inlet. One inlet of the second air inlet tube is located at one position of the second air inlet tube and is connected to the second gas-liquid separation chamber, while the other inlet is located at another position of the second air inlet tube and is connected to the second pressure detection interface. The inner air inlet of the second air inlet tube... The unit has an internal tube connecting the second internal air intake port and the second external air intake port. It is understood that the inner and outer sides of the second air intake tube are not directly connected at the position between the second internal and external air intake ports. In some cases, the second internal air intake port is located on the side wall of the second gas-liquid separation chamber; in other cases, the second air intake tube at least partially extends into the second gas-liquid separation chamber, with the second internal air intake port located on the second air intake tube within the second gas-liquid separation chamber; in some cases, the second external air intake port is connected to the second detection pressure interface through other connecting structures; and in other cases, the second external air intake port is directly connected to the second detection pressure interface. The second air intake tube and the first air intake tube are independent of each other and are generally not directly connected.

[0074] The draining mechanism also includes a second draining valve 420, a third draining port 363 of the draining pipeline connected to the second gas-liquid separation chamber 321, a valve passage end 421 of the second draining valve 420 connected to the third draining port 363, and another valve passage end 422 of the second draining valve connected to the inlet pump port 431. As described in the foregoing embodiments, the entire drainage pipeline includes two drainage valves, three drainage ports, and one drainage pump. From a connectivity perspective, one side of the first drainage port connects to the first gas-liquid separation chamber, and the other side connects to the first valve passage of the first drainage valve. The first drainage valve includes a first valve passage and a second valve passage. Switching the first drainage valve controls the connection / disconnection (or shut-off) between the first and second valve passages. The second valve passage of the first drainage valve connects to the inlet of the drainage pump. One side of the third drainage port connects to the second gas-liquid separation chamber, and the other side connects to the third valve passage of the second drainage valve. The second drainage valve includes a third valve passage and a fourth valve passage. Switching the second drainage valve controls the connection / disconnection between the third and fourth valve passages. The fourth valve passage is connected to the inlet of the discharge pump. In some cases, the second and fourth valve passages can be connected to a common discharge pipeline, which is then connected to the inlet of the discharge pump. In other cases, the second and fourth valve passages can be connected to the inlet of the discharge pump through different discharge pipelines. In still other cases, if there are two or more inlet pumps, the second valve passage can be connected to one of the inlet pumps, and the fourth valve passage can be connected to another inlet pump. The discharge pump includes an inlet pump and an outlet pump, which can transfer liquid or gaseous media from the inlet pump to the outlet pump. The outlet pump of the discharge pump is connected to the second discharge pipe. Since the discharge pump has a certain driving force for the flowing liquid and gaseous media, it can easily discharge the liquid and gaseous media from the second discharge pipe.

[0075] The second control module 440 is also connected to the second drain valve 420 and is used to control the operation of the second drain valve. Specifically, the controller can transmit control signals to the second drain valve, and the second drain valve can switch between open and closed states according to the control signals.

[0076] In operation, the position of the second internal air intake port 392 is higher than the position of the third drain port 363.

[0077] For example, during pressure testing, the pressure instrument under test is a differential pressure instrument. The first pressure under test interface is connected to the high-pressure measuring port of the pressure instrument under test, and the first detection pressure interface is connected to the high-pressure output port of the pressure controller. The second pressure under test interface is connected to the low-pressure measuring port of the pressure instrument under test, and the second detection pressure interface is connected to the low-pressure output port of the pressure controller. When the detection pressure needs to be provided, the second control module controls the first drain valve to be closed, controls the second drain valve to be closed, and controls the drain pump to be stopped. The gas-liquid separator forms two independent pressure transmission channels that meet the airtight connection requirements. The pressure controller outputs the differential pressure detection pressure through the high-pressure measuring port and the low-pressure measuring port. The high-pressure gas working medium enters the first external gas inlet through the first detection pressure interface, then enters the first gas inlet pipe through the first external gas inlet pipe, passes through the first gas inlet pipe, reaches the first internal gas inlet pipe, flows out from the first internal gas inlet pipe, enters the first gas-liquid separation chamber, enters the first pressure under test interface, and finally reaches the high-pressure measuring port of the pressure instrument under test through the first pressure under test interface. Simultaneously, the low-pressure gas working medium enters the second external gas inlet through the second detection pressure interface, then enters the second gas inlet pipe through the second external gas inlet pipe, passes through the second gas inlet pipe, reaches the second internal gas inlet pipe, flows out from the second internal gas inlet pipe, enters the second gas-liquid separation chamber, enters the second pressure under test interface, and finally reaches the low-pressure measuring port of the pressure instrument under test through the second pressure under test interface. The pressure instrument under test measures the relative pressure of its two pressure measuring ports to obtain the differential pressure measurement result.Simultaneously with the aforementioned pressure transmission process, the pressure gauge under test may contain residual liquid working medium. If the liquid working medium is located inside the high-pressure measuring port, it flows into the first gas-liquid separation chamber through the first pressure under test interface. At this time, due to gravity, the liquid working medium will fall to the bottom of the first gas-liquid separation chamber, accumulating initially at the location of the first drain pipe opening. Since the first internal air inlet is higher than the first drain pipe opening, and the first external air inlet and other locations of the first air inlet are not directly connected to the first gas-liquid separation chamber, and the first pressure testing interface is also not directly connected to the first gas-liquid separation chamber, the liquid working medium will not enter the first gas-liquid separation chamber. The air tube achieves gas-liquid separation. Simultaneously, if the liquid working medium is located inside the low-pressure measuring port, it flows into the second gas-liquid separation chamber through the second pressure-detected interface. At this point, due to gravity, the liquid working medium falls to the bottom of the second gas-liquid separation chamber, accumulating at the position of the third drain pipe opening. Since the position of the second inner air inlet is higher than the position of the third drain pipe opening, and the second outer air inlet and other positions of the second air inlet are not directly connected to the second gas-liquid separation chamber, nor is the second pressure-detecting interface directly connected, the liquid working medium does not enter the second air inlet, thus achieving gas-liquid separation. Subsequently, after the pressure detection process is completed, the second control module controls the first drain valve to be open, controls the second drain valve to be open, and controls the drain pump to be started. The suction force of the drain pump is transmitted to the first drain port and the third drain port through the drain pipeline, thereby drawing the liquid working medium in the first gas-liquid separation chamber and the second gas-liquid separation chamber into the drain pipeline. The liquid working medium reaches the drain pump through the first drain port / third drain port, a part of the drain pipeline, the first drain valve / second drain valve, and another part of the drain pipeline. Then it is discharged from the outlet of the drain pump to the second drain port. Finally, it is discharged from the second drain port to the outside of the gas-liquid separator, thus achieving the result of removing the liquid working medium from the pressure detection transmission pipeline.

[0078] In some cases, the gas-liquid separator of this embodiment also includes a device base 330; a second drain port 362 is provided on the first base side 331 of the device base 330, a fourth drain port 364 is provided on the second base side 332 of the device base 330, the second drain port 362 is connected to the fourth drain port 364, the fourth drain port 364 is connected to the outlet pump port 432, and the drain pump 430 is sealed and connected to the device base 330 around the fourth drain port 364. Specifically, this embodiment provides a device base. In some cases, the device base has an internal connecting pipe. One end of the connecting pipe is connected to the second drain port on the first base side of the device base, and the other end is connected to the fourth drain port on the second base side of the device base. In other cases, all or part of the connecting pipe can be located outside the device base. During installation, the drain pump is installed on the device base, with the side of the drain pump with the outlet contacting the side of the device base with the fourth drain port. The outlet is directly opposite the fourth drain port, thus connecting the outlet and the fourth drain port. The device base and the drain pump are sealed around the fourth drain port. Based on this connection, on the one hand, the drain pump can be fixed on the device base through the sealed connection, ensuring the stability of the overall structure. On the other hand, the built-in or external pipes of the device base provide a fixed pipe structure, avoiding the disorganization and instability of the connecting pipes. Furthermore, the sealed connection between the drain pump and the device base provides a larger sealing space, better sealing effect, and lower sealing difficulty.

[0079] In some cases, the second base side 332 of the device base 330 is also provided with a drain valve port (366, 367) and a fifth drain pipe port 365. The first drain valve 410 is provided at the drain valve port (366, 367), the fifth drain pipe port 365 is connected to the drain valve port (366, 367), and the inlet pump port 431 is connected to the fifth drain pipe port 365. The first drain valve 410 is sealed and connected to the device base 330 around the drain valve port (366, 367), and the drain pump 430 is sealed and connected to the device base 330 around the fifth drain pipe port 365. Specifically, in this embodiment, based on the aforementioned improved example one, a fifth drain port and a drain valve port are further provided on the device base. In some cases, a connecting pipe is provided inside, outside, or in combination with the device base. One end of the connecting pipe is connected to the drain valve port, and the other end of the connecting pipe is connected to the fifth drain port. The positions of the fifth drain port and the fourth drain port correspond to the positions of the inlet and outlet pump ports on the drain pump. Thus, when the drain pump is arranged in contact with the device base, the inlet pump port of the drain pump is directly opposite to and connected to the fifth drain port, and the outlet pump port of the drain pump is directly opposite to and connected to the fourth drain port. The design of the drain valve port corresponds to the first drain valve. The first drain valve is set at the drain valve port. On the one hand, the first drain valve and the device base can be fixed by the sealed connection between the first drain valve and the device base. On the other hand, the required connection structure can be achieved without additional pipelines by the pre-installed air passage on the device base.

[0080] In some cases, the second base side 332 of the device base 330 is provided with a first drain port 361, and the drain valve ports (366, 367) include a sixth drain port 366 and a seventh drain port 367. The sixth drain port 366 is connected to the first drain port 361, the first valve passage end 411 is connected to the sixth drain port 366, the second valve passage end 412 is connected to the seventh drain port 367, the seventh drain port 367 is connected to the fifth drain port 365, and the drain pump 430 is sealed and connected to the device base 330 around the sixth drain port 366 and the seventh drain port 367. Specifically, in this embodiment, based on the aforementioned improved example two, the first drain valve can encapsulate the valve body, valve needle, and other structures within its internal structure. The first valve passage end and the second valve passage end flow directly out of the first drain valve. During installation, the first drain valve is sealed and connected to the device base. The first valve passage end is aligned with and connected to the sixth drain port, and the second valve passage end is aligned with and connected to the seventh drain port. Through pre-installed pipelines inside or outside the device base, the first drain port is connected to the sixth drain port, and the seventh drain port is connected to the fifth drain port. This allows the pipeline connection with the first drain valve to be completed simultaneously with the sealed installation of the first drain valve.

[0081] In some cases, in this embodiment, the gas-liquid separator further includes a device top seat 340; a first top seat side 341 of the device top seat 340 is provided with a first pressure-tested interface 353, and a second top seat side 342 of the device top seat 340 is provided with a first test connection port 373, the first pressure-tested interface 353 is connected to the first test connection port 373, and the first test connection port 373 is connected to the first gas-liquid separation chamber 311; a first base side 331 is also provided with a first detection pressure interface 351, and a second base side... 332 is also provided with a first detection connection port 371, a first detection pressure interface 351 connected to the first detection connection port 371, the first detection connection port 371 connected to the first external air intake port 381, one end of the first air intake pipe 380 is sealed and connected to the device base 330 around the first detection connection port 371, and the other end of the first air intake pipe 380 is fixedly connected to the device top seat 340; in the working state, the projections of the first detection connection port 373 and the first internal air intake port 382 on the horizontal plane are different. Specifically, a structure for setting up a first air intake tube is provided. Specifically, a first pressure-to-be-tested interface and a first connection port are provided on the top seat of the device. The first pressure-to-be-tested interface is located on the first top seat side of the top seat, and the first connection port is located on the second top seat side of the top seat. A first pressure-to-detection interface and a first connection port are provided on the base of the device. The first pressure-to-be-tested interface is located on the first base side of the base, and the first connection port is located on the second base side of the base. In this configuration, the second top seat side and the second base side are opposite to each other, while the first top seat side and the first base side are opposite to each other. A connecting tube with good sealing performance is configured. One end of the connecting tube can be sealed to the top seat, enclosing the first connection port within a sealed environment. The other end of the connecting tube can be sealed to the base, enclosing the first connection port and the first drain pipe opening within a sealed environment. This ensures that the top seat and the connecting tube... The device base and the device itself form the aforementioned first gas-liquid separation chamber. One end of the first air intake tube is fixedly connected to the top of the device, and the other end of the first air intake tube is connected to the device base. This connection includes a connecting connection, a sealing connection, and a fixed connection. The connecting connection means that the other end of the aforementioned first air intake tube is provided with the aforementioned first external air intake port, and the first external air intake port is connected to the first detection connection port. The sealing connection and the fixed connection are achieved by the same structure, that is, one end of the first air intake tube is sealed and connected to the device base around the first detection connection port. Since the projections of the first detection connection port and the first internal air intake port on the horizontal plane are different in the working state, when the liquid working medium flows out from the first detection connection port, it will not fall into the first internal air intake port or its vicinity. Since the first internal air intake port is opened on the first air intake tube, when the liquid working medium flows out from the first detection connection port, it will not fall onto the first air intake tube.

[0082] In some cases, the gas-liquid separator also includes a second communication module 450, which is connected to the second control module 440. The second communication module 450 can be a wired communication interface, a wireless communication module, or both. Through the second communication module 450, it can communicate with external devices, such as pressure controllers, thereby combining the gas-liquid separation process and the pressure detection process for control operations, improving detection efficiency.

[0083] In some cases, the volume of the first gas-liquid separation chamber is greater than or equal to 2 ml and less than or equal to 20 ml. Analysis revealed that when the volume of the gas-liquid separator is greater than or equal to 2 ml, it allows for complete detection of all points on the pressure gauge under test without the need for draining during a single test. This means that most pressure gauges under test contain 1.5 ml or less of liquid working medium. Theoretically, the larger the chamber volume of the gas-liquid separator, the more liquid working medium it can hold, and the lower the frequency of draining operations. However, a larger chamber volume is not always better, as an excessively large chamber volume leads to increased gas capacity, which in turn affects the pressure control efficiency of the detection pressure source. Analysis showed that when the volume of the gas-liquid separator is between 2-10 ml, reducing the number of draining operations results in a greater gain in detection efficiency. When the volume of the gas-liquid separator exceeds 10-15 ml (depending on the test situation), the detrimental effect of the gas capacity on detection efficiency becomes increasingly significant. When the volume of the gas-liquid separator exceeds 20 ml, the impact of the gas capacity becomes very obvious, which is detrimental to the control of the detection pressure.

[0084] In some cases, the gas-liquid separator also includes a battery module 470, which is electrically connected to the second control module 440. In some cases, the gas-liquid separator may not be equipped with a battery module and may be powered by a power interface on the device. In other cases, the battery module can power the various electrical components. In some cases, power can be supplied by both the power interface and the built-in battery module.

[0085] In some cases, the gas-liquid separator also includes a gas-filled material (not shown in the figure, but its specific location can be referenced to the position of the first gas-liquid separation chamber 311). The gas-filled material is located in the first gas-liquid separation chamber and occupies part of the volume of the first gas-liquid separation chamber. In order to achieve a universal design for the gas-liquid separator, a larger gas-liquid separation tube design that meets various conditions can be adopted, such as 20ml. In this case, in order to solve the problem that the gas volume of the gas-liquid separation tube causes to the detection efficiency and detection pressure control, a gas-filled material can be arranged in the gas-liquid separation tube according to different test conditions. The gas-filled material will occupy a certain space in the gas-liquid separation tube, thereby reducing the gas volume of the gas-liquid separation tube, so as to achieve the technical effect of meeting the test conditions of different types of pressure instruments with a standard gas-liquid separator.

[0086] In some cases, the gas-liquid separator also includes a control panel 460, which is connected to the second control module 440. The control panel 460 is used for human-machine interaction. The control panel can be a touch screen, a button, a display screen, an indicator light, or a combination of all or some of the above methods.

[0087] The pressure detection system can detect both micro-pressure gauges and differential pressure gauges, and includes an air pump 100, a pressure controller 200, and a gas-liquid separator 300.

[0088] The air pump 100 includes an initial pressure output port 110, through which the air pump outputs an initial pressure (in the form of a gaseous working medium).

[0089] The pressure controller 200 includes an initial pressure input port 210, a first pressure control valve 221, a pressure regulator 230, a second pressure control valve 222, a third pressure control valve 223, a fourth pressure control valve 224, an atmospheric pressure module 240, a first detection pressure output port 251, a second detection pressure output port 252, and a connecting gas path. The pressure controller 200 also includes a first control module 260 and a first communication module 270, and a pressure measurement module 280. The first detection pressure output port 251 is equivalent to the aforementioned first pressure output port, the second detection pressure output port 252 is equivalent to the aforementioned second pressure output port, the first control module 260 is equivalent to the aforementioned detection controller, and the first communication module 270 is equivalent to the aforementioned detection communication module.

[0090] The initial pressure output port 110 is connected to the initial pressure input port 210. The initial pressure input port 210 is connected to one valve passage of the first pressure control valve 221. The other valve passage of the first pressure control valve 221 is connected to one valve passage of the second pressure control valve 222. The initial pressure input can be controlled through the first pressure control valve 221. The pressure regulator 230 is a pressure vessel connected between the first pressure control valve 221 and the second pressure control valve 222. The pressure regulator 230 can stably control the input gas working medium to avoid sudden excessively high or low pressure. The other valve passage of the second pressure control valve 222 is connected to... One valve passage of the third pressure control valve 223 is connected to the other valve passage of the third pressure control valve 223, which is connected to the first detection pressure output port 251. The second pressure control valve 222 is a coarse adjustment shut-off valve, and the third pressure control valve 223 is a fine adjustment shut-off valve. The flow of the working gas can be regulated through the second and third pressure control valves 222 and 223 to ensure that the flow to the first detection pressure output port 251 meets the control requirements. The fourth pressure control valve 224 is a pressure relief valve connected between the third pressure control valve 223 and the first detection pressure output port 251. The pressure measurement module is connected to the first detection pressure output port 251. The atmospheric pressure module 240 is connected to the second detection pressure output port 252.

[0091] Through the first detection pressure output port 251, the pressure controller 200 can output the detection pressure of gauge pressure or absolute pressure. Through the first detection pressure output port 251 and the second detection pressure output port 252, the pressure controller 200 can output the detection pressure of differential pressure.

[0092] The first control module 260 is connected to the pressure measurement module 280, the first pressure control valve 221, the second pressure control valve 222, the third pressure control valve 223, and the fourth pressure control valve 224 respectively. During operation, the first control module 260 acquires the target pressure value, and then controls the first pressure control valve 221, the second pressure control valve 222, the third pressure control valve 223, and the fourth pressure control valve 224 respectively based on the current pressure value and the target pressure value fed back by the pressure measurement module 280, so that the detected pressure eventually reaches the target pressure value.

[0093] The first control module 260 is also connected to the first communication module 270. The first control module 260 stores a coordinated control strategy for the gas-liquid separator 300. During the pressure detection process, the first control module 260 can determine whether to execute control of the gas-liquid separator 300 based on the current target pressure value. If it is executed, a control signal for the gas-liquid separator 300 is generated and transmitted to the first communication module 270.

[0094] The gas-liquid separator 300 includes a first separation tube 310, a second separation tube 320, a device base 330, and a device top 340. The device base 330 indicates that in some cases, this component can be located at the lower part or bottom of the entire gas-liquid separator 300. The device top 340 indicates that in some cases, this component can be located at the upper part or top of the entire gas-liquid separator 300. It is understood that the device base 330 and the device top 340 are only relative concepts under a certain posture and do not indicate any limitation on the working posture or placement position.

[0095] The device base 330 has a first base side 331 with a first pressure detection interface 351, a second pressure detection interface 352, and a second drain outlet 362. The first pressure detection interface 351 is connected to the first pressure detection output port 251, and the second pressure detection interface 352 is connected to the second pressure detection output port 252. The second drain outlet 362 can be directly connected to the atmosphere or to a container or other similar container to collect the waste liquid discharged from the second drain outlet 362. The second base side 332 of the base 330 is provided with a first drain port 361, a third drain port 363, a fourth drain port 364, a fifth drain port 365, a sixth drain port 366, a seventh drain port 367, an eighth drain port 368, a ninth drain port 369, a first detection connection port 371, and a second detection connection port 372. The first drain port 361 is connected to the sixth drain port 366 via a connecting pipe located within the device base 330, and the second drain port 362 is connected to... The device base 330 is connected to the fourth drain port 364 via a connecting pipe. The third drain port 363 is connected to the eighth drain port 368 via a connecting pipe within the device base 330. The fifth drain port 365 is connected to the seventh drain port 367 and the ninth drain port 369 via a connecting pipe within the device base 330. The first detection connection port 371 is connected to the first detection pressure interface 351 via a connecting pipe within the device base 330. The second detection connection port 372 is connected to... The device is connected to the second detection pressure interface 352 via a connecting pipe located in the device base 330. For ease of installation, the positions of the first drain port 361 and the first detection connection port 371 are close together, the positions of the third drain port 363 and the second detection pressure interface 352 are close together, the positions of the fourth drain port 364 and the fifth drain port 365 are close together, the positions of the sixth drain port 366 and the seventh drain port 367 are close together, and the positions of the eighth drain port 368 and the ninth drain port 369 are close together.

[0096] The first top seat side 341 of the device top seat 340 faces away from the device base 330. The first top seat side 341 is provided with a first pressure test interface 353 and a second pressure test interface 354. The second top seat side 342 of the device top seat 340 is arranged opposite to the first top seat side 341. The second top seat side 342 is provided with a first test connection port 373 and a second test connection port 374. The first test connection port 373 is connected to the first pressure test interface 353 through a connecting pipe located in the device top seat 340. The second test connection port 374 is connected to the second pressure test interface 354 through a connecting pipe located in the device top seat 340.

[0097] The first separation tube 310 is disposed between the device top seat 340 and the device base 330. The first separation tube 310 and the device top seat 340 are sealed together, and the first test connection port 373 is enclosed inside the first separation tube 310. The first separation tube 310 and the device base 330 are sealed together, and the first drain port 361 and the first test connection port 371 are enclosed inside the first separation tube 310. Thus, the first separation tube 310, the device top seat 340 and the device base 330 form the first gas-liquid separation chamber 311.

[0098] The first air intake tube 380 is at least partially located within the first gas-liquid separation chamber 311. The first end of the first air intake tube 380 is fixedly connected to the device base 330. The first end of the first air intake tube 380 is provided with a first external air intake port 381, which is connected to the first detection connection port 371. The first air intake tube 380 and the device base 330 are sealed together around the first detection connection port 371, so that the working medium cannot directly enter the first detection connection port 371. The first air intake tube 380 extends within the first gas-liquid separation chamber 311. The second end of the first air intake tube 380 is fixedly connected to the device top seat 340. The first air intake tube 380 is provided with a first internal air intake port 382 near its second end. The first internal air intake port 382 is connected to the first external air intake port 381 through a connecting pipe located within the first air intake tube 380. Since they belong to two different components, the positions of the first internal air intake port 382 and the first detection connection port 373 are significantly different.

[0099] The second separation tube 320 is also disposed between the device top seat 340 and the device base 330. The second separation tube 320 and the device top seat 340 are sealed together, and the second test connection port 374 is wrapped inside the second separation tube 320. The second separation tube 320 and the device base 330 are sealed together, and the third drain port 363 and the second test connection port 372 are wrapped inside the second separation tube 320. Thus, the second separation tube 320, the device top seat 340 and the device base 330 form the second gas-liquid separation chamber 321.

[0100] The second air intake tube 390 is at least partially located within the second gas-liquid separation chamber 321. The first end of the second air intake tube 390 is fixedly connected to the device base 330. The first end of the second air intake tube 390 is provided with a second external air intake port 391, which is connected to the second detection connection port 372. The second air intake tube 390 and the device base 330 are sealed together around the second detection connection port 372, so that the working medium cannot directly enter the second detection connection port 372. The second air intake tube 390 extends within the second gas-liquid separation chamber 321. The second end of the second air intake tube 390 is fixedly connected to the device top seat 340. The second air intake tube 390 is provided with a second internal air intake port 392 near its second end. The second internal air intake port 392 is connected to the second external air intake port 391 through a connecting pipe located within the second air intake tube 390. Since they belong to two different components, the positions of the second internal air intake port 392 and the second detected connection port 374 are significantly different.

[0101] Outside the first gas-liquid separation chamber 311 and the second gas-liquid separation chamber 321, a first drain valve 410, a second drain valve 420, and a drain pump 430 are provided.

[0102] The first drain valve 410 includes a first valve passage end 411 and a second valve passage end 412. The first drain valve 410 can control the connection between the first valve passage end 411 and the second valve passage end 412 through a built-in valve structure. When the first drain valve 410 is in the open state, the first valve passage end 411 and the second valve passage end 412 are connected. When the first drain valve 410 is in the closed state, the first valve passage end 411 and the second valve passage end 412 are sealed and not connected. The first valve passage end 411 of the first drain valve 410 is connected to the sixth drain port 366, and the second valve passage end 412 of the first drain valve 410 is connected to the seventh drain port 367. The first drain valve 410 and the device base 330 are fixedly connected, and the first drain valve 410 and the device base 330 are sealed around the sixth drain port 366 and the seventh drain port 367.

[0103] The second drain valve 420 includes a third valve passage 421 and a fourth valve passage 422 (the third valve passage 421 and the fourth valve passage 422 do not indicate that the second drain valve 420 has three or more valve passages, but are used to distinguish it from the first valve passage 411 and the second valve passage 412. It is understood that a shut-off valve at two valve passages can also meet the design requirements of the second drain valve 420). The second drain valve 420, through its built-in valve structure, can control the connection between the third valve passage 421 and the fourth valve passage 422. When the second drain valve 420 is open... When the second drain valve 420 is in the closed state, the third valve passage 421 and the fourth valve passage 422 are connected. When the second drain valve 420 is in the closed state, the third valve passage 421 and the fourth valve passage 422 are sealed and not connected. The third valve passage 421 of the second drain valve 420 is connected to the eighth drain port 368, and the fourth valve passage 422 of the second drain valve 420 is connected to the ninth drain port 369. The second drain valve 420 and the device base 330 are fixedly connected, and the second drain valve 420 and the device base 330 are sealed around the eighth drain port 368 and the ninth drain port 369.

[0104] The discharge pump 430 includes an inlet pump port 431 and an outlet pump port 432. The discharge pump 430 can be a suction pump body or a discharge pump body. Regardless of the type of pump body, in the working state, the discharge pump 430 has driving force for the process of transferring the working medium from the inlet pump port 431 to the outlet pump port 432. In the non-working state (e.g., the non-energized state), in some cases, the discharge pump 430 allows the working medium to move naturally in one direction from the inlet pump port 431 to the outlet pump port 432. The outlet pump port 432 is connected to the fourth discharge pipe port 364, and the inlet pump port 431 is connected to the fifth discharge pipe port 365. The discharge pump 430 and the device base 330 are fixedly connected, and the discharge pump 430 and the device base 330 are sealed around the fourth discharge pipe port 364 and the fifth discharge pipe port 365.

[0105] The gas-liquid separator 300 also includes a second control module 440 (equivalent to the device controller in the aforementioned embodiment), a second communication module 450, a control panel 460, and a battery module 470. The second control module 440 is connected to the second communication module 450, the control panel 460, and the battery module 470, respectively. The second communication module 450 is communicatively connected to the first communication module 270.

[0106] In this embodiment, during the preparation stage of the pressure detection process, the high-pressure measuring port 510 of the pressure gauge 500 under test is connected to the first pressure interface 353 under test, and the low-pressure measuring port 520 of the pressure gauge 500 under test is connected to the second pressure interface 354 under test.

[0107] It should be noted that the foregoing description of the feasible gas-liquid separator and pressure controller connection or structural configuration in this embodiment is exemplary and not limiting. Unless it contributes to solving the technical problem, these exemplary descriptions are generally not intended to limit the scope of protection of this application.

[0108] In some cases, in this embodiment, the pressure detection system further includes a pressure measurement module and a main control module. The pressure controller includes a first detection pressure output port, and the pressure controller outputs the detection pressure as a gaseous working medium at least through the first detection pressure output port. The gas-liquid separator includes a first detection pressure interface, a first gas-liquid separation chamber, a first tested pressure interface, a first drain port, and a first drain valve. The first gas-liquid separation chamber is connected to the first detection pressure interface at a first position, connected to the first tested pressure interface at a second position, and connected to the first drain port at a third position. The first position is higher than the third position. The first drain valve is connected to the first drain port and is used to control the opening and closing of the first drain port. The first detection pressure interface is connected to the first detection pressure output port. The first tested pressure interface is used to connect to the pressure measurement port of the tested pressure instrument. The pressure measurement module is connected to the first detection pressure output port and is used to measure the detection pressure. The main control module is connected to the pressure controller, the gas-liquid separator, and the pressure measurement module, respectively.

[0109] Based on the aforementioned pressure detection system, the pressure control method includes: the main control module acquiring the pressure measurement value from the pressure measurement module; the aforementioned control of the pressure controller to generate pressure in this embodiment includes: the main control module sending a first pressure control signal to the pressure controller, causing the pressure controller to output the gas working medium at a first output rate; the aforementioned control of the pressure controller to stop generating pressure in this embodiment includes: when the pressure measurement value reaches a first pressure threshold, the main control module sending a stop pressure generation signal to the pressure controller, causing the pressure controller to stop outputting the gas working medium; the aforementioned control of the gas-liquid separator to periodically drain liquid at a small time ratio in this embodiment includes... When the measured pressure value is less than a first pressure threshold and greater than a second pressure threshold, the main control module sends a first discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a first duty cycle. Upon power-up, the first discharge valve is in the open state, and the working medium in the first gas-liquid separation chamber is discharged through the first discharge port. The first duty cycle is less than or equal to a first proportional threshold. In this embodiment, controlling the gas-liquid separator to perform periodic discharge at a larger time ratio includes, when the measured pressure value is less than the second pressure threshold, sending a second discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a second duty cycle, which is greater than the first duty cycle. The product of the first pressure threshold and the first duty cycle is less than or equal to twice the product of the second pressure threshold and the second duty cycle, and greater than or equal to half the product of the second pressure threshold and the second duty cycle.

[0110] Specifically, this embodiment provides a method for controlling the time ratio in periodic drainage by controlling the duty cycle. It can be understood that the first drainage valve used to control the drainage is a solenoid valve. The solenoid valve becomes open when energized and closes when de-energized. Correspondingly, by directly controlling the duty cycle of the first drainage valve, the first drainage valve can be opened and closed in a controlled manner.

[0111] One of the key design features of this embodiment is the establishment of a proportional relationship between the first pressure threshold, the first duty cycle, the second pressure threshold, and the second duty cycle. It is understood that this proportional relationship is not fixed, depending on the length of the drainage pipe. If the drainage pipe is long, the product of the first pressure threshold and the first duty cycle is also large. In extreme cases, the product of the first pressure threshold and the first duty cycle can reach twice the product of the second pressure threshold and the second duty cycle. This means that a higher outflow velocity is allowed under high pressure conditions, while the risk is reduced by relying on the drainage pipe. If the drainage pipe is short, the product of the first pressure threshold and the first duty cycle is also small. In extreme cases, the product of the first pressure threshold and the first duty cycle can reach half the product of the second pressure threshold and the second duty cycle. This is because, with a reasonably set second pressure threshold, the aforementioned limit already provides a relatively safe outflow velocity.

[0112] It is understood that in some cases, the main control module in this embodiment may be part of the pressure controller. For example, the main control module and the first control module may be at least partially integrated. In some cases, the pressure measurement module may also be part of the pressure controller, such as the pressure measurement module that is integrated into the pressure controller.

[0113] In some cases, the aforementioned processing of pressure measurement values ​​in this embodiment includes processing pressure measurement values ​​at at least two time points to obtain a first pressure change rate; when the first pressure change rate is less than or equal to a first change threshold, sending a second pressure control signal to the pressure controller, causing the pressure controller to output the gas working medium at a second output rate.

[0114] One of the key design features of this embodiment is that, upon analysis, the detection pressure is reflected through a gaseous working medium and a liquid working medium (if a liquid working medium is present). The gaseous working medium is manifested through compression. In the presence of compressed gaseous working medium, the liquid working medium can only affect the detection pressure through its level and volume. Further analysis reveals that in this embodiment, the liquid working medium exists only in a residual form; its quantity is relatively small and does not fill the entire pressure transmission pipeline, nor is it directly connected to the pressure controller. Therefore, the liquid level has almost no effect on the detection pressure. Consequently, when the working medium flow rate is constant or roughly equal, changes in the quantity of liquid working medium result in small changes in its volume, thus having a minimal impact on the detection pressure. However, changes in the quantity of gaseous working medium directly affect its compression, thus having a greater impact on the detection pressure.

[0115] Based on the foregoing analysis, in this embodiment, when the duty cycle is constant, the opening and closing status of the first drain valve is also determined. Correspondingly, the amount of working medium that can pass through per unit time is also determined (a function determined by the change of the detected pressure value). One way to determine the first change threshold in this embodiment is to arrange a relatively large amount of liquid working medium in the gas-liquid separator, so that when the first drain valve is opened, only liquid working medium is discharged for a period of time. The pressure change rate of this process of only liquid working medium being discharged is statistically analyzed and used as the first change threshold.

[0116] Based on the design of this embodiment, the discharge status of the liquid working medium can be determined according to the change in detection pressure, thereby determining the residual liquid working medium in the gas-liquid separator. If it is determined that a large amount of liquid working medium is being discharged, it indicates that a large amount of liquid working medium remains in the gas-liquid separator. In this case, the pressure controller is controlled by the second pressure control signal to generate pressure, providing sufficient internal pressure to the gas-liquid separator to promote the rapid discharge of the liquid working medium. Conversely, if it is determined that very little liquid working medium is being discharged or even that no liquid working medium is being discharged, it indicates that there is no or only a very small amount of liquid working medium in the gas-liquid separator. In this case, the aforementioned process can be omitted. As can be seen from the aforementioned technical solution of this embodiment, the pressure generation action stops when the first pressure threshold is reached for the first time. That is to say, the subsequent natural emptying relies on the detection pressure inside the gas-liquid separator. This natural emptying process can also solve the problem of discharging a very small amount of liquid working medium.

[0117] In some cases, the aforementioned processing of pressure measurements in this embodiment includes: when the first pressure change rate is greater than or equal to a second change threshold, sending a stop pressure generation signal to the pressure controller, wherein the second change threshold is greater than the first change threshold; when the first pressure change rate is greater than the first change threshold but less than the second change threshold, sending a third pressure control signal to the pressure controller, causing the pressure controller to output the gaseous working medium at a third output rate, wherein the third output rate is less than the second output rate. When the liquid working medium is discharged from the first drain port, pressure measurements are acquired at least two times to determine the first change threshold; when the gaseous working medium is discharged from the first drain port, pressure measurements are acquired at least two times to determine the second change threshold.

[0118] One of the key design features of this embodiment is that the discharge stage of the liquid working medium is divided into three phases: discharge of the entire liquid working medium, discharge of the entire gaseous working medium, and discharge of the gas-liquid mixed working medium. Based on the aforementioned analysis, the rate of change of the detected pressure is lowest during discharge of the entire liquid working medium, highest during discharge of the entire gaseous working medium, and falls between the two during discharge of the gas-liquid mixed working medium. In this case, given the first change threshold determined by the aforementioned technical solution, a second change threshold is determined. Generally, the rate of change of the detected pressure during discharge of the entire gaseous working medium is determined as the second change threshold. In the subsequent pressure control process, the following stages are generally encountered: First, the first pressure change rate is less than the first change threshold, meaning that the discharged working medium is entirely liquid. A gaseous working medium is then output at a relatively high output rate. Simultaneously, the existence of the upper limit of the first pressure threshold... This ensures that the detection pressure within the gas-liquid separator is always at a safe maximum value, thus facilitating the rapid discharge of the liquid working medium. This process may last for some time. Afterward, as the residual liquid working medium decreases, gaseous working medium begins to be discharged. At this point, the first pressure change rate exceeds the first change threshold but is less than the second change threshold, entering the gas-liquid mixing discharge stage. In this more pronounced gas-liquid mixing discharge stage, a certain amount of liquid medium remains. Discharging the gaseous working medium at a lower output rate maintains the detection pressure within a reasonable range, preventing a rapid decrease as the working medium is discharged. It also avoids overfilling with gaseous working medium, which could affect the normal evacuation rate. This process may continue for some time. Finally, the liquid working medium is largely discharged, with primarily gaseous working medium being discharged. At this point, the first pressure change rate is greater than or equal to the second change threshold, and pressure generation can be stopped. It is understood that, depending on the actual situation, one or more of the aforementioned three stages may be skipped. Therefore, the solution presented in this embodiment does not execute each discharge stage sequentially, but rather the main controller directly determines the process based on changes in the detection pressure, achieving a technical advantage that is fully applicable to various situations.

[0119] In some cases, the aforementioned processing of the pressure measurement value in this embodiment includes: when the first pressure change rate is less than or equal to the first change threshold and the pressure measurement value is less than or equal to the third pressure threshold, sending a third discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a third duty cycle; when the first pressure change rate is less than or equal to the first change threshold and the pressure measurement value is greater than the third pressure threshold, sending a fourth discharge signal to the gas-liquid separator, causing the first discharge valve to periodically open and close according to a fourth duty cycle, which is greater than the third duty cycle. The third pressure threshold is determined based on the cumulative discharge time of the gas-liquid separator; the longer the cumulative discharge time, the smaller the third pressure threshold. When the pressure measurement value is less than or equal to the first pressure threshold and greater than the second pressure threshold, the fourth duty cycle is greater than the first duty cycle; when the pressure measurement value is less than or equal to the second pressure threshold, the third duty cycle is less than the second duty cycle.

[0120] One of the key design features of this embodiment is that, during the process of determining whether the liquid working medium is being discharged, further subdivision is performed based on the current pressure measurement value and the third pressure threshold. For example, when the pressure measurement value is less than or equal to the first pressure threshold and greater than the second pressure threshold, the aforementioned third duty cycle can be equal to the aforementioned first duty cycle, or equivalent to the smaller value of the first duty cycle, and the aforementioned fourth duty cycle can be greater than the aforementioned first duty cycle, or equivalent to the larger value of the first duty cycle. As another example, when the pressure measurement value is less than or equal to the second pressure threshold, the aforementioned third duty cycle can be less than the aforementioned second duty cycle, or equivalent to the smaller value of the second duty cycle, and the aforementioned fourth duty cycle can be equal to the aforementioned second duty cycle, or equivalent to the larger value of the second duty cycle.

[0121] Based on the aforementioned scheme, when the first pressure change rate is less than or equal to the first change threshold, due to the input of the gas working medium, there may be several scenarios: Scenario 1: The duty cycle of the first drain valve is small, and the discharge volume of the working medium is less than the input volume of the gas working medium; Scenario 2: The duty cycle of the first drain valve is moderate, and the discharge volume of the working medium exceeds the input volume of the gas working medium, but the excess is not significant; Scenario 3: The discharge volume of the working medium significantly exceeds the input volume of the gas working medium. The basis for judging the aforementioned three scenarios is the aforementioned third pressure threshold. The third pressure threshold can be a function of the cumulative drain time, similar to an ideal change curve of the detected pressure during the drain process. If the detected pressure exceeds this ideal curve, then Scenario 1 or part of Scenario 2 may exist. Correspondingly, a higher duty cycle is used to accelerate the change in detected pressure. If the detected pressure is lower than this ideal curve, then Scenario 3 or Scenario 2 may exist. Correspondingly, a lower duty cycle is used to slow down the change in detected pressure. Furthermore, it can be understood that if one or two situations exist, a higher duty cycle can increase the discharge rate of the liquid working medium and improve the evacuation efficiency. If three or two situations exist, a lower duty cycle can prevent the liquid working medium from flowing out too quickly, ensuring the safety of the testing personnel.

[0122] As described above in this embodiment regarding the pressure detection system, in some cases, the gas-liquid separator further includes a drain pump. The inlet of the drain pump is connected to a first drain valve, and the outlet of the drain pump is used to discharge the working medium. The pressure control method includes, at least partially simultaneously, generating a drain control signal. The main control module sends a pump control signal to the gas-liquid separator, causing the drain pump to drive the working medium from the inlet to the outlet. The drain control signal includes a first drain signal and a second drain signal. It is understood that the drain pump and the drain valve are energized simultaneously in at least some cases to ensure rapid discharge of the liquid working medium.

[0123] For solutions involving a drain pump, the aforementioned processing of the pressure measurement value in this embodiment includes: when the pressure measurement value first reaches zero pressure, a fifth drain signal is sent to the gas-liquid separator, causing the first drain valve to periodically open and close according to a fifth duty cycle; simultaneously, at least partially, a pump control signal is sent to the gas-liquid separator to generate the fifth drain signal, causing the detected pressure to tend towards a negative pressure value; when the pressure measurement value reaches a fourth pressure threshold, a pump stop signal is sent to the gas-liquid separator, causing the drain pump to shut down, and the fourth pressure threshold is less than the zero pressure value; when the pressure measurement value is less than the zero pressure value, a fourth pressure control signal is sent to the gas-liquid separator, causing the pressure controller to output the gas working medium according to a fourth output rate, and the detected pressure tends towards zero pressure; when the pressure measurement value reaches zero pressure for the second time, a stop pressure generation signal is sent to the pressure controller; when the pressure measurement value reaches zero pressure for the second time, a stop drain signal is sent to the gas-liquid separator, causing the first drain valve to remain normally closed. The fourth output rate is less than the first output rate.

[0124] Reference Figure 10 As shown, one of the key design features of this embodiment is that, in the pre-drainage stage of gauge pressure and differential pressure detection, firstly, based on the aforementioned drainage process, when the detected pressure is above zero, it changes from high to low. Then, maintaining this trend, the first drainage valve is periodically opened via the fifth drainage signal, and the drainage pump continuously extracts the working medium via the pump control signal, turning the detected pressure negative. At this point, the detected pressure in the gas-liquid separator is less than zero, until the detected pressure reaches the fourth pressure threshold, which is a preset threshold less than zero. After this, drainage continues. When the pump is powered off, the pressure medium in the gas-liquid separator is no longer actively extracted. Due to its internal structure, the drain pump only allows the pressure medium to move unidirectionally. Simultaneously with the power-off of the drain pump, the gas pressure medium is output at a relatively small output rate via the fourth pressure control signal, which allows the detection pressure to rise slowly. The detection pressure changes from the fourth pressure threshold to the zero pressure point. After that, the detection pressure eventually returns to the zero pressure point. Once the detection pressure reaches the zero pressure point again, the control pressure controller stops pressurizing, closes the first drain valve, and the pressure transmission pipeline is no longer connected for draining, completing the draining and zeroing process.

[0125] Understandably, before the aforementioned process, the trend of pressure change is from high to low, which is the return stroke in pressure detection. This deviates from the subsequent outgoing stroke pressure detection. After the aforementioned process, the trend of pressure change is from low to high, which can be normally connected with the outgoing stroke of pressure detection, thus achieving the goal of improving pressure detection efficiency.

[0126] The pressure controller described above in this embodiment also includes a second pressure detection output port. The pressure controller outputs differential pressure through the first pressure detection output port and the second pressure detection output port. The gas-liquid separator described above in this embodiment also includes a second pressure detection interface, a second gas-liquid separation chamber, a second pressure-tested interface, a second drain port, and a second drain valve. The second gas-liquid separation chamber is connected to the second pressure detection interface at the fourth position, to the second pressure-tested interface at the fifth position, and to the second drain port at the sixth position. The fourth position is higher than the sixth position. The second drain valve is connected to the second drain port and is used to control the opening and closing of the second drain port. The inlet of the drain pump is also connected to the second drain valve. The second pressure detection interface is connected to the second pressure detection output port. The first pressure-tested interface is used to connect to another pressure measurement port of the pressure gauge under test.

[0127] Based on the aforementioned pressure controller and gas-liquid separator, the pressure control method in this embodiment includes, at least partially simultaneously, generating a first discharge signal, and the main control module sending a sixth discharge signal to the gas-liquid separator, causing the second discharge valve to periodically open and close according to a sixth duty cycle, where the sixth duty cycle is greater than the first duty cycle, and the second discharge valve is closed when the first discharge valve is open. The sixth duty cycle is determined based on the cumulative discharge time of the gas-liquid separator; the longer the cumulative discharge time, the smaller the difference between the sixth duty cycle and the first duty cycle.

[0128] One of the key design features of this embodiment is that the drainage in the second detection pressure transmission channel is controlled by a first detection pressure transmission channel with controllable detection pressure. By combining a larger sixth duty cycle with a drainage pump, the technical problem of low detection pressure and difficulty in natural drainage in the second detection pressure transmission channel is overcome.

[0129] The aforementioned main control module in this embodiment can be used as or included in a detection host for pressure detection. The detection host includes a main control module, a first connection module, and a second connection module. The main control module is connected to both the first and second connection modules. The first connection module connects to a pressure controller, which outputs detection pressure as a gaseous working medium at least through a first detection pressure output port. The second connection module connects to a gas-liquid separator, which separates the gaseous and liquid working media during the detection pressure output process. The main control module is configured to acquire the measured pressure value from the first connection module and send a pressure control signal to the first connection module. This system controls the pressure controller to output a working gas medium and detects that the pressure is approaching a first pressure threshold. When the measured pressure reaches the first pressure threshold, a stop pressure generation signal is sent to the first connection module to control the pressure controller and stop it from generating pressure. When the measured pressure is between the first and second pressure thresholds, a first drain signal is sent to the second connection module to control the gas-liquid separator, causing it to drain periodically at a relatively small time ratio, where the first pressure threshold is greater than the second pressure threshold. When the measured pressure is less than the second pressure threshold, a second drain signal is sent to the second connection module, causing the gas-liquid separator to drain periodically at a relatively large time ratio.

[0130] In this embodiment, the aforementioned main control module can be included in a pressure control device, for example, integrated with the first control module in a pressure controller. This pressure control device is used for pressure detection and includes a pressure control mechanism, a main control module, a pressure measurement module, and a main communication module. The pressure control mechanism outputs the detection pressure at least through a first detection pressure output port using a gaseous working medium. The pressure measurement module is connected to the first detection pressure output port and is used to measure the detection pressure and generate a pressure measurement value. The main control module is connected to the pressure control mechanism, the pressure measurement module, and the main communication module. The first detection pressure output port is used to connect to the first detection pressure interface of a gas-liquid separator. The main communication module is used for communication connection to the gas-liquid separator. The main control module is configured to: acquire pressure from the pressure measurement module... The system measures the pressure; sends a pressure control signal to the pressure control mechanism to control the pressure control mechanism, causing the first detection pressure output port to output the working gas medium, and the detection pressure to approach the first pressure threshold; when the pressure measurement value reaches the first pressure threshold, it sends a stop pressure generation signal to the pressure control mechanism to control the pressure control mechanism, causing the pressure controller to stop pressure generation; when the pressure measurement value is between the first and second pressure thresholds, it sends a first drain signal to the main communication module to control the gas-liquid separator, causing the gas-liquid separator to perform periodic draining at a small time ratio, and the first pressure threshold is greater than the second pressure threshold; when the pressure measurement value is less than the second pressure threshold, it sends a second drain signal to the main communication module, causing the gas-liquid separator to perform periodic draining at a larger time ratio.

[0131] The above are merely preferred embodiments of this application. Based on the ability to solve the technical problems, some technical features of this embodiment may be omitted or modified into equivalent technical features. For those skilled in the art, this application may have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this application should be included within the protection scope of this application.

Claims

1. A pressure control method, characterized in that, An application is made in a pressure detection system, the pressure detection system including a pressure controller and a gas-liquid separator, the pressure controller outputting the detection pressure with a gaseous working medium, and the gas-liquid separator used to separate the gaseous working medium and the liquid working medium during the transmission of the detection pressure, the pressure control method including: The pressure controller is controlled to generate pressure, so that the pressure controller outputs the gas working medium, and the detected pressure tends to a first pressure threshold. When the detected pressure reaches the first pressure threshold, the pressure controller is controlled to stop generating pressure. When the detected pressure is between the first pressure threshold and the second pressure threshold, the gas-liquid separator is controlled to perform periodic liquid discharge at a small time ratio, and the first pressure threshold is greater than the second pressure threshold. When the detected pressure is less than the second pressure threshold, the gas-liquid separator is controlled to perform periodic liquid discharge at a larger time ratio. The smaller time proportion refers to the existence of multiple consecutive drainage cycles, in which only a small proportion of the time in each drainage cycle is in the drainage state, and the longer proportion of the time before and after the drainage state is in the non-drainage state, so that the liquid working medium of the previous cycle can travel a longer distance in the drainage pipeline, and the liquid working medium of the next cycle can catch up. The larger time proportion refers to the fact that a large proportion of the time in each drainage cycle is in the drainage state, so that the liquid working medium of the previous cycle can catch up with the liquid working medium of the next cycle after traveling a very short distance into the drainage pipeline.

2. The pressure control method according to claim 1, characterized in that, The pressure detection system further includes a pressure measurement module and a main control module. The pressure controller includes a first detection pressure output port, and the pressure controller outputs the detection pressure as a gaseous working medium at least through the first detection pressure output port. The gas-liquid separator includes a first detection pressure interface, a first gas-liquid separation chamber, a first tested pressure interface, a first drain port, and a first drain valve. The first gas-liquid separation chamber is connected to the first detection pressure interface at a first position, connected to the first tested pressure interface at a second position, and connected to the first drain port at a third position, with the first position being higher than the third position. The first drain valve is connected to the first drain port and is used to control the opening and closing of the first drain port. The first detection pressure interface is connected to the first detection pressure output port. The first tested pressure interface is used to connect to the pressure measurement port of the tested pressure instrument. The pressure measurement module is connected to the first detection pressure output port and is used to measure the detection pressure. The main control module is connected to the pressure controller, the gas-liquid separator, and the pressure measurement module respectively. The pressure control method includes: The main control module obtains the pressure measurement value of the detected pressure from the pressure measurement module; The control of the pressure controller to generate pressure includes the main control module sending a first pressure control signal to the pressure controller, causing the pressure controller to output the gas working medium at a first output rate; The method of controlling the pressure controller to stop pressurization includes: when the pressure measurement value reaches a first pressure threshold, the main control module sends a stop pressurization signal to the pressure controller, causing the pressure controller to stop outputting the gas working medium; The control of the gas-liquid separator to perform periodic liquid discharge at a relatively small time ratio includes: when the pressure measurement value is less than the first pressure threshold and greater than the second pressure threshold, the main control module sends a first liquid discharge signal to the gas-liquid separator, causing the first liquid discharge valve to open and close periodically according to a first duty cycle. When powered on, the first liquid discharge valve is in the open state, and the working medium in the first gas-liquid separation chamber is discharged through the first liquid discharge port. The first duty cycle is less than or equal to the first ratio threshold. The control of the gas-liquid separator to perform periodic liquid discharge at a larger time ratio includes sending a second liquid discharge signal to the gas-liquid separator when the pressure measurement value is less than the second pressure threshold, so that the first liquid discharge valve opens and closes periodically according to a second duty cycle, wherein the second duty cycle is greater than the first duty cycle.

3. The pressure control method according to claim 2, characterized in that, include, The pressure measurements at at least two time points are processed to obtain a first pressure change rate; When the first pressure change rate is less than or equal to the first change threshold, a second pressure control signal is sent to the pressure controller, causing the pressure controller to output the gas working medium at a second output rate.

4. The pressure control method according to claim 3, characterized in that, include, When the first pressure change rate is greater than or equal to the second change threshold, the pressure controller is sent a stop pressure generation signal, where the second change threshold is greater than the first change threshold. When the first pressure change rate is greater than the first change threshold and less than the second change threshold, a third pressure control signal is sent to the pressure controller, causing the pressure controller to output the gas working medium at a third output rate, wherein the third output rate is less than the second output rate.

5. The pressure control method according to claim 3, characterized in that, include, When the first pressure change rate is less than or equal to the first change threshold and the pressure measurement value is less than or equal to the third pressure threshold, a third discharge signal is sent to the gas-liquid separator, causing the first discharge valve to open and close periodically according to the third duty cycle. When the first pressure change rate is less than or equal to the first change threshold and the pressure measurement value is greater than the third pressure threshold, a fourth discharge signal is sent to the gas-liquid separator, causing the first discharge valve to open and close periodically according to a fourth duty cycle, which is greater than the third duty cycle.

6. The pressure control method according to any one of claims 2-5, characterized in that, The gas-liquid separator further includes a drain pump, the inlet of which is connected to the first drain valve, and the outlet of which is used to discharge the working medium. The pressure control method includes... At least partially simultaneously, a discharge control signal is generated. The main control module sends a pump control signal to the gas-liquid separator, causing the discharge pump to drive the working medium from the inlet pump port to the outlet pump port. The discharge control signal includes the first discharge signal and the second discharge signal.

7. The pressure control method according to claim 6, characterized in that, include, When the pressure measurement value reaches zero pressure for the first time, a fifth discharge signal is sent to the gas-liquid separator, causing the first discharge valve to open and close periodically according to the fifth duty cycle. At least partially simultaneously, the fifth discharge signal is generated, and the pump control signal is sent to the gas-liquid separator, causing the detected pressure to tend towards a negative pressure value; When the pressure measurement value reaches the fourth pressure threshold, a pump stop signal is sent to the gas-liquid separator, causing the discharge pump to be powered off, and the fourth pressure threshold is less than the pressure zero point; When the measured pressure value is less than the zero pressure point, a fourth pressure control signal is sent to the gas-liquid separator, causing the pressure controller to output the gas working medium at a fourth output rate, and the detected pressure tends to the zero pressure point; When the pressure measurement value reaches the zero pressure point for the second time, a stop pressure generation signal is sent to the pressure controller; When the pressure measurement value reaches zero for the second time, a stop discharge signal is sent to the gas-liquid separator, causing the first discharge valve to remain closed.

8. The pressure control method according to claim 6, characterized in that, The pressure controller further includes a second pressure detection output port. The pressure controller outputs differential pressure through the first pressure detection output port and the second pressure detection output port. The gas-liquid separator further includes a second pressure detection interface, a second gas-liquid separation chamber, a second pressure-detected interface, a second drain port, and a second drain valve. The second gas-liquid separation chamber is connected to the second pressure detection interface at a fourth position, to the second pressure-detected interface at a fifth position, and to the second drain port at a sixth position. The fourth position is higher than the sixth position. The second drain valve is connected to the second drain port and is used to control the opening and closing of the second drain port. The inlet of the drain pump is also connected to the second drain valve. The second pressure detection interface is connected to the second pressure detection output port. The first pressure-detected interface is used to connect to another pressure measurement port of the pressure gauge under test. The pressure control method includes... At least partially simultaneously with the generation of the first discharge signal, the main control module sends a sixth discharge signal to the gas-liquid separator, causing the second discharge valve to periodically open and close according to a sixth duty cycle, the sixth duty cycle being greater than the first duty cycle, and when the first discharge valve is in the open state, the second discharge valve is in the closed state.

9. A detection host for pressure detection, characterized in that, The detection host includes a main control module, a first connection module, and a second connection module. The main control module is connected to the first connection module and the second connection module. The first connection module is used to connect to a pressure controller, which outputs detection pressure as a gaseous working medium at least through a first detection pressure output port. The second connection module is used to connect to a gas-liquid separator, which separates the gaseous working medium and the liquid working medium during the detection pressure output process. The main control module is configured to... The pressure measurement value of the detected pressure is obtained from the first connection module; A pressure control signal is sent to the first connection module to control the pressure controller, so that the pressure controller outputs the gas working medium and the detected pressure tends to a first pressure threshold. When the pressure measurement value reaches the first pressure threshold, a stop pressure generation signal is sent to the first connection module to control the pressure controller, so that the pressure controller stops generating pressure. When the pressure measurement value is between the first pressure threshold and the second pressure threshold, a first drainage signal is sent to the second connection module to control the gas-liquid separator so that the gas-liquid separator performs periodic drainage at a small time ratio, and the first pressure threshold is greater than the second pressure threshold. When the pressure measurement value is less than the second pressure threshold, a second drain signal is sent to the second connection module, so that the gas-liquid separator performs periodic drain at a larger time ratio; The smaller time proportion refers to the existence of multiple consecutive drainage cycles, in which only a small proportion of the time in each drainage cycle is in the drainage state, and the longer proportion of the time before and after the drainage state is in the non-drainage state, so that the liquid working medium of the previous cycle can travel a longer distance in the drainage pipeline, and the liquid working medium of the next cycle can catch up. The larger time proportion refers to the fact that a large proportion of the time in each drainage cycle is in the drainage state, so that the liquid working medium of the previous cycle can catch up with the liquid working medium of the next cycle after traveling a very short distance into the drainage pipeline.

10. A pressure control device for pressure detection, characterized in that, The pressure control device includes a pressure control mechanism, a main control module, a pressure measurement module, and a main communication module. The pressure control mechanism outputs a detection pressure using a gaseous working medium at least through a first detection pressure output port. The pressure measurement module is connected to the first detection pressure output port and is used to measure the detection pressure and generate a pressure measurement value. The main control module is connected to the pressure control mechanism, the pressure measurement module, and the main communication module. The first detection pressure output port is used to connect to the first detection pressure interface of the gas-liquid separator. The main communication module is used to communicate with the gas-liquid separator. The main control module is configured as follows: The pressure measurement value is obtained from the pressure measurement module; A pressure control signal is sent to the pressure control mechanism to control the pressure control mechanism so that the first detection pressure output port outputs the gas working medium and the detection pressure tends to a first pressure threshold. When the pressure measurement value reaches the first pressure threshold, a stop pressure generation signal is sent to the pressure control mechanism to control the pressure control mechanism to stop pressure generation. When the pressure measurement value is between the first pressure threshold and the second pressure threshold, a first drainage signal is sent to the main communication module to control the gas-liquid separator so that the gas-liquid separator performs periodic drainage at a small time ratio, and the first pressure threshold is greater than the second pressure threshold. When the pressure measurement value is less than the second pressure threshold, a second drain signal is sent to the main communication module, so that the gas-liquid separator performs periodic draining at a larger time ratio. The smaller time proportion refers to the existence of multiple consecutive drainage cycles, in which only a small proportion of the time in each drainage cycle is in the drainage state, and the longer proportion of the time before and after the drainage state is in the non-drainage state, so that the liquid working medium of the previous cycle can travel a longer distance in the drainage pipeline, and the liquid working medium of the next cycle can catch up. The larger time proportion refers to the fact that a large proportion of the time in each drainage cycle is in the drainage state, so that the liquid working medium of the previous cycle can catch up with the liquid working medium of the next cycle after traveling a very short distance into the drainage pipeline.

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