A backflow prevention pressure calibration device and method

Abstract

The present invention discloses an anti-backflow pressure calibration device and method, the anti-backflow pressure calibration device comprises: a gas source component for providing the gas required for calibration; a first pressure regulating component, the first pressure regulating component is connected to the gas source component, and is used to regulate the gas provided by the gas source component to a standard gas; an anti-backflow component, the anti-backflow component comprises a first opening and closing valve, a bypass pipe and a gas-liquid isolating component sequentially arranged on the calibration pipeline, the first opening and closing valve is arranged downstream of the first pressure regulating component, and is used to control the opening and closing of the calibration pipeline, the bypass pipe is used to absorb gas impurities refluxed in the calibration pipeline, and the gas-liquid isolating component is used to isolate liquid impurities in the calibration pipeline; an output component, the output component comprises a test interface, and the part to be calibrated is connected to the test interface. The present invention solves the problem in the prior art that the part to be calibrated is easy to cause contamination and damage to the pressure calibration device.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure calibration, and in particular, relates to an anti-backflow pressure calibration device and method. Background Art

[0002] At present, pressure instruments, pressure sensors and pressure transmitters have been widely used in various industries. In order to ensure the accuracy and reliability of their measurement values, these instruments, sensors, transmitters, etc. need to be calibrated regularly.

[0003] For some special industries, there will be certain pollution sources in the used pressure instrument equipment. For example, after the use of pressure instruments, sensors, and transmitters in the nuclear power field, there are mostly a small amount of radioactive materials and radioactive particles inside. When the pressure calibration device is used to calibrate or calibrate them, the radioactive materials and radioactive particles will flow with the gas medium and flow back into the pressure calibration device, causing pollution or even damage to the pressure calibration device. The radioactive or radioactive materials are directly discharged into the air through the pressure controller, which will also cause pollution to the surrounding environment.

[0004] As can be seen from the above, in the prior art, there is a problem that the part to be calibrated easily causes contamination and damage to the pressure calibration device. Summary of the invention

[0005] The object of the present invention is to provide a backflow prevention pressure calibration device and method, so as to solve the problem in the prior art that the calibrated part is prone to cause contamination and damage to the pressure calibration device.

[0006] In order to achieve the above-mentioned purpose, one aspect of the present invention provides an anti-backflow pressure calibration device, comprising: a gas source assembly, used to provide the gas required for calibration; a first pressure regulating component, the first pressure regulating component is connected to the gas source assembly, and is used to adjust the gas provided by the gas source assembly to a standard gas; an anti-backflow assembly, the anti-backflow assembly comprises a first opening and closing valve, a bypass pipe and a gas-liquid isolation component which are sequentially arranged on the calibration pipeline, the first opening and closing valve is arranged downstream of the first pressure regulating component, and is used to control the opening and closing of the calibration pipeline, the bypass pipe is used to absorb gas impurities refluxed in the calibration pipeline, and the gas-liquid isolation component is used to isolate liquid impurities in the calibration pipeline; an output assembly, the output assembly comprises a test interface, and the part to be calibrated is connected to the test interface.

[0007] Furthermore, the backflow prevention component also includes a first filter element and a second filter element, the first filter element is arranged between the first opening and closing valve and the first pressure regulating element, and the second filter element is arranged between the gas-liquid isolation element and the bypass tube, and the filtering directions of the first filter element and the second filter element are opposite to the flow direction of the standard gas.

[0008] Furthermore, the anti-backflow pressure calibration device also includes a pressure relief exhaust pipeline and a gas recovery and purification processing component. One end of the pressure relief exhaust pipeline is connected in parallel to the calibration pipeline and the connection point is located between the bypass tube and the second filter element. The other end of the pressure relief exhaust pipeline has an exhaust port, and the gas recovery and purification processing component is connected to the exhaust port of the pressure relief exhaust pipeline.

[0009] Furthermore, the anti-backflow pressure calibration device also includes a third filter element, which is arranged between the gas recovery and purification processing component and the exhaust port.

[0010] Furthermore, the anti-backflow assembly also includes a second on-off valve and a second pressure regulating member which are sequentially arranged on the pressure relief exhaust pipeline, the second on-off valve is used to control the opening and closing of the pressure relief exhaust pipeline, and the second pressure regulating member is used to adjust the pressure of the gas discharged from the pressure relief exhaust pipeline.

[0011] Furthermore, the backflow prevention assembly also includes a standard sensor, which is arranged between the second on-off valve and the second pressure regulating member and is used to detect the pressure of the test interface when the pressure is relieved and the exhaust is performed.

[0012] Furthermore, the backflow prevention assembly also includes a two-position three-way valve, two interfaces of which are connected to the calibration pipeline and are located between the gas-liquid isolation component and the test interface, and the third interface of the two-position three-way valve is connected in parallel to the pressure relief exhaust pipeline and the connection point is located between the second pressure regulating component and the exhaust port.

[0013] Furthermore, the backflow prevention component also includes an air container, which is arranged between the first on-off valve and the bypass pipe.

[0014] Another aspect of the present invention provides a backflow prevention pressure calibration method, which uses the above-mentioned backflow prevention pressure calibration device to implement pressure calibration, and the method includes: step S1: adjusting the output pressure of the first pressure regulating component to a predetermined purge pressure value, opening the first on-off valve and keeping the second on-off valve of the backflow prevention component closed, and adjusting the two-position three-way valve of the backflow prevention component to be connected to the pressure relief exhaust pipeline and disconnected from the test interface, and purging the calibration pipeline; step S2: adjusting the output pressure of the first pressure regulating component to a predetermined first target pressure value in turn, so as to adjust the gas provided by the gas source component to a standard gas, adjusting the two-position three-way valve to be disconnected from the pressure relief exhaust pipeline and connected to the test interface, connecting the part to be calibrated to the test interface, so as to perform a pressure-boosting calibration on the part to be calibrated; step S3: boosting After the calibration is completed, close the first on-off valve and open the second on-off valve, and simultaneously and sequentially adjust the output pressures of the first pressure regulating component and the second pressure regulating component of the anti-backflow assembly to the predetermined second target pressure value, so that the gas in the calibration pipeline located downstream of the first on-off valve is depressurized and discharged from the pressure relief exhaust pipeline, and the gas located upstream of the first on-off valve is depressurized and discharged through the first pressure regulating component, thereby depressurizing the system; Step S4: After both ends of the first on-off valve are depressurized to the second target pressure value and a static pressure equilibrium state is reached, open the first on-off valve and close the second on-off valve, and adjust the output pressure of the first pressure regulating component to a predetermined depressurization target pressure value, wherein the second target pressure value is greater than the depressurization target pressure value, so that the gas in the calibration pipeline is depressurized and discharged through the first pressure regulating component, thereby completing the pressure relief calibration.

[0015] Furthermore, step S1 also includes: after the purging is completed, closing the first on-off valve so that the gas in the calibration pipeline located downstream of the first on-off valve is depressurized and discharged from the pressure relief exhaust pipeline; adjusting the output pressure of the first pressure regulating component to 0, so that the gas located upstream of the first on-off valve is depressurized and discharged through the first pressure regulating component.

[0016] Furthermore, the second target pressure value is greater than the pressure relief target pressure value by 1% to 2%.

[0017] According to the anti-backflow pressure calibration device and method of the above aspects of the present invention, by setting an anti-backflow component, the anti-backflow component includes a first on-off valve, a bypass tube and a gas-liquid isolation piece which are sequentially arranged on the calibration pipeline. The first on-off valve is arranged downstream of the first pressure regulating piece and is used to control the opening and closing of the calibration pipeline. The bypass tube is used to absorb gas impurities that flow back in the calibration pipeline. The gas-liquid isolation piece is used to isolate liquid impurities in the calibration pipeline. In this way, when the pressure calibration device calibrates the parts to be calibrated for special purposes, such as pressure instruments and meters used in the nuclear power field, the impurities such as radioactive substances and radioactive particles inside the parts will be isolated and absorbed by the gas-liquid isolation piece and the bypass tube even if they flow back into the pressure calibration device with the gas flow, so that they cannot cause pollution and damage to the pressure calibration device, thereby ensuring the normal use of the pressure calibration device and solving the problem in the prior art that the parts to be calibrated are prone to cause pollution and damage to the pressure calibration device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings used in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work:

[0019] Figure 1 is a schematic structural diagram of a backflow prevention pressure calibration device according to an embodiment of the present invention;

[0020] Figure 2 is a flow chart of a method for calibrating a backflow prevention pressure according to an embodiment of the present invention;

[0021] The above drawings include the following reference numerals:

[0022] 1. Gas source; 2. Pressure reducing valve; 3. First pressure regulating component; 4. First filter component; 5. First opening and closing valve; 6. Gas container; 7. Flow bypass tube; 8. Second filter component; 9. Gas-liquid isolation component; 10. Two-position three-way valve; 11. Second pressure regulating component; 12. Standard sensor; 13. Second opening and closing valve; 14. Third filter component; 15. Gas recovery and purification treatment component; 16. Test interface; 17. Exhaust port; 18. Calibration pipeline; 19. Pressure relief exhaust pipeline. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0024] In order to solve the problem in the prior art that the component to be calibrated easily causes contamination and damage to the pressure calibration device, an embodiment of the present invention provides an anti-backflow pressure calibration device. Figure 1 It is a schematic structural diagram of an anti-backflow pressure calibration device according to an embodiment of the present invention.

[0025] like Figure 1 As shown, the anti-backflow pressure calibration device includes an air source assembly, a first pressure regulating component 3, an anti-backflow assembly and an output assembly. The air source assembly is used to provide the gas required for calibration. The first pressure regulating component 3 is connected to the air source assembly, and is used to adjust the gas provided by the air source assembly to a standard gas. The anti-backflow assembly includes a first on-off valve 5, a bypass pipe 7 and a gas-liquid isolation component 9 which are sequentially arranged on the calibration pipeline 18. The first on-off valve 5 is arranged downstream of the first pressure regulating component 3, and is used to control the opening and closing of the calibration pipeline 18. The bypass pipe 7 is used to absorb gas impurities that reflux in the calibration pipeline 18. The gas-liquid isolation component 9 is used to isolate liquid impurities in the calibration pipeline 18. The output assembly includes a test interface 16, and the part to be calibrated is connected to the test interface 16.

[0026] The pressure calibration device of the embodiment of the present invention is provided with an anti-backflow component, which includes a first on-off valve 5, a bypass tube 7 and a gas-liquid isolation piece 9 which are sequentially arranged on the calibration pipeline 18. The first on-off valve 5 is arranged downstream of the first pressure regulating piece 3, and is used to control the opening and closing of the calibration pipeline 18. The bypass tube 7 is used to absorb gas impurities that reflux in the calibration pipeline 18. The gas-liquid isolation piece 9 is used to isolate liquid impurities in the calibration pipeline 18. In this way, when the pressure calibration device calibrates a part to be calibrated for special purposes, such as pressure instruments used in the nuclear power field, impurities such as radioactive substances and radioactive particles inside the part will be isolated and adsorbed by the gas-liquid isolation piece 9 and the bypass tube 7 even if they flow back into the pressure calibration device with the gas flow, so that the pressure calibration device cannot be contaminated or damaged, thereby ensuring the normal use of the pressure calibration device.

[0027] like Figure 1 As shown, the gas source assembly includes a gas source 1 and a pressure reducing valve 2. The gas source 1 provides a gas medium as an input of the first pressure regulating component 3. In this embodiment, the gas source 1 is generally an industrial gas cylinder or other high-pressure gas supply equipment. The pressure reducing valve 2 reduces the pressure of the gas output by the gas source 1 to provide the first pressure regulating component 3 with a suitable input gas source pressure.

[0028] like Figure 1As shown, the backflow prevention assembly also includes a first filter 4 and a second filter 8. The first filter 4 is arranged between the first opening and closing valve 5 and the first pressure regulating member 3, and the second filter 8 is arranged between the gas-liquid isolation member 9 and the bypass pipe 7, and the filtering directions of the first filter 4 and the second filter 8 are opposite to the flow direction of the standard gas. That is to say, the first filter 4 and the second filter 8 in this embodiment are installed in opposite directions, so that when the standard gas flows from the first pressure regulating member 3 to the test interface 16, the first filter 4 and the second filter 8 will not hinder the standard gas, and when the pressure is released, the first filter 4 and the second filter 8 can filter impurities such as water, oil, particulate matter, aerosol, especially special particulate matter such as nuclear radiation material, to prevent the special material remaining in the calibrated part at the test interface 16 from flowing back, polluting or even damaging the first pressure regulating member 3. Further, the provision of two filters can improve the filtering effect of special materials and ensure that the first pressure regulating member 3 is not polluted or damaged.

[0029] In the present embodiment, the bypass tube 7 is a spiral stainless steel tube. Specifically, the bypass tube 7 can be formed by winding a stainless steel tube with an outer diameter of 1 / 16 inches of about 1 meter, and winding about 10 turns, so as to increase the air resistance and allow the tiny particles to settle in the bypass tube 7. During the pressure relief process of the calibration process, the gas medium refluxes, and after being filtered by the gas-liquid isolation element 9 and the second filter element 8, most of the impurities have been filtered out, and there are still tiny particles, especially nuclear radiation and radioactive particles that continue to reflux. Adding the bypass tube 7 between the second filter element 8 and the first opening and closing valve 5 can increase the air resistance when the gas refluxes, slow down the flow rate of the gas, and allow the tiny particles to be sufficiently precipitated and attached to remain in the bypass tube 7 to prevent them from flowing back into the first pressure regulating element 3 and causing pollution or even damage to the first pressure regulating element 3.

[0030] like Figure 1 As shown, the anti-backflow pressure calibration device also includes a pressure relief exhaust pipeline 19, one end of which is connected in parallel to the calibration pipeline 18 and the connection point is located between the bypass tube 7 and the second filter element 8, and the other end of the pressure relief exhaust pipeline 19 has an exhaust port 17.

[0031] like Figure 1As shown, the backflow prevention assembly also includes a second on-off valve 13 and a second pressure regulating member 11 which are sequentially arranged on the pressure relief exhaust pipeline 19. The second on-off valve 13 is used to control the opening and closing of the pressure relief exhaust pipeline 19, and the second pressure regulating member 11 is used to adjust the pressure of the gas discharged from the pressure relief exhaust pipeline 19. Specifically, the second pressure regulating member 11 is mainly used for pressure relief adjustment, which relieves most of the pressure, so that the first pressure regulating member 3 end and the test interface 16 end bounded by the first on-off valve 5 reach a static pressure balance, and then accurately relieves the small pressure through the first pressure regulating member 3. During pressure relief, the main gas pressure is quickly relieved through the second pressure regulating member 11 and discharged from the exhaust port 17. During pressure relief, the first on-off valve 5 is closed to cut off the calibration pipeline 18, and the second on-off valve 13 is opened to connect the pressure relief exhaust pipeline 19. The static pressure balance state is that after the device relieves the main pressure and the device is stable, the first pressure regulating member 3 end and the test interface 16 end bounded by the first on-off valve 5 reach a pressure balance state. After the device releases the main pressure and reaches the static pressure balance state, the first on-off valve 5 is opened, and then the first pressure regulating component 3 is used to accurately release the tiny pressure. At this time, since the difference from the target pressure relief pressure is very small, the gas flow rate in the gas path is very slow during pressure relief. After filtering and sedimentation through the gas-liquid isolation component 9, the second filter component 8, the bypass tube 7 and the first filter component 6, the gas returns to the first pressure regulating component 3 for discharge, which can effectively prevent the backflow of nuclear radiation materials and the like from polluting or even damaging the first pressure regulating component 3, and can prevent the direct discharge of nuclear radiation materials from causing pollution to the surrounding environment.

[0032] In this embodiment, the first on-off valve 5 and the second on-off valve 13 are both solenoid valves.

[0033] like Figure 1 As shown, the backflow prevention assembly further includes a standard sensor 12. The standard sensor 12 is disposed between the second on-off valve 13 and the second pressure regulating member 11, and is used to detect the pressure of the test interface 16 during pressure relief and exhaust.

[0034] like Figure 1 As shown, the anti-backflow assembly also includes a two-position three-way valve 10. The two interfaces of the two-position three-way valve 10, namely interfaces a and b, are connected to the calibration pipeline 18 and are located between the gas-liquid isolation component 9 and the test interface 16. The third interface c of the two-position three-way valve 10 is connected in parallel to the pressure relief exhaust pipeline 19 and the connection point is located between the second pressure regulating component 11 and the exhaust port 17. By setting the two-position three-way valve 10, the test interface 16 can be selectively connected or closed. When purging or pressure relief exhaust is required, the gas in the standard pipeline 18 can directly enter the pressure relief exhaust pipeline 19 through the two-position three-way valve 10, and then be discharged to the outside of the anti-backflow pressure calibration device.

[0035] like Figure 1As shown, the backflow prevention assembly further includes an air container 6, which is disposed between the first on-off valve 5 and the bypass pipe 7. The air container 6 can store air, thereby stabilizing the gas flow rate and allowing the pressure increase and decrease process to proceed smoothly.

[0036] like Figure 1 As shown, the anti-backflow pressure calibration device also includes a gas recovery and purification component 15, and the gas recovery and purification component 15 is connected to the exhaust port 17 of the pressure relief exhaust pipeline 19. Further, the anti-backflow pressure calibration device also includes a third filter 14, and the third filter 14 is arranged between the gas recovery and purification component 15 and the exhaust port 17. Through the above arrangement, the third filter 14 can filter the exhausted gas, and the gas recovery and purification component 15 further purifies the gas filtered by the third filter 14 before discharging it, so as to prevent the gas from carrying radioactive substances and the like directly discharged into the surrounding environment.

[0037] In this embodiment, the anti-backflow pressure calibration device further includes a controller, which is electrically connected to the first pressure regulating member 3 and the first opening and closing valve 5. Furthermore, the controller is also electrically connected to the second pressure regulating member 11, the second opening and closing valve 13, the two-position three-way valve 10 and other components, so as to automatically control the opening or closing of each component according to demand, and realize automatic control of the purge, pressure increase and decrease, calibration, pressure relief and exhaust and other operations of the anti-backflow pressure calibration device in this embodiment.

[0038] An embodiment of the present invention further provides a backflow prevention pressure calibration method, which uses the above-mentioned backflow prevention pressure calibration device to implement pressure calibration. Figure 2 FIG. 1 is a flow chart of a method for calibrating a backflow prevention pressure according to an embodiment of the present invention. Figure 2 As shown, the pressure calibration method of the embodiment of the present invention includes:

[0039] Step S1: adjust the output pressure of the first pressure regulating member 3 to a predetermined purge pressure value, open the first on-off valve 5 and keep the second on-off valve 13 of the anti-backflow assembly closed, and adjust the two-position three-way valve 10 of the anti-backflow assembly to be connected to the pressure relief exhaust pipeline 19 and disconnected from the test interface 16, and purge the calibration pipeline 18;

[0040] Step S2: sequentially adjusting the output pressure of the first pressure regulating member 3 to a predetermined first target pressure value, so as to adjust the gas provided by the gas source assembly to the standard gas, adjusting the two-position three-way valve 10 to be disconnected from the pressure relief exhaust pipeline 19 and connected to the test interface 16, and connecting the part to be calibrated to the test interface 16 to perform pressure boost calibration on the part to be calibrated;

[0041] Step S3: After the pressure boost calibration is completed, the first on-off valve 5 is closed and the second on-off valve 13 is opened, and the output pressures of the first pressure regulating member 3 and the second pressure regulating member 11 of the anti-backflow assembly are simultaneously and sequentially lowered to a predetermined second target pressure value, so that the gas located downstream of the first on-off valve 5 in the calibration pipeline 18 is depressurized and discharged from the pressure relief exhaust pipeline 19, and the gas located upstream of the first on-off valve 5 is depressurized and discharged through the first pressure regulating member 3, thereby depressurizing the system;

[0042] Step S4: After both ends of the first on-off valve 5 are depressurized to the second target pressure value and reach a static pressure equilibrium state, the first on-off valve 5 is opened and the second on-off valve 13 is closed, and the output pressure of the first pressure regulating component 3 is adjusted to a predetermined depressurization target pressure value, and the second target pressure value is greater than the depressurization target pressure value, so that the gas in the calibration pipeline 18 is depressurized and discharged through the first pressure regulating component 3, thereby completing the pressure relief calibration.

[0043] In this embodiment, the predetermined purge pressure value in step S1 can be preset according to the required purge intensity.

[0044] In this embodiment, the first target pressure value predetermined in step S2 and the second target pressure value predetermined in step S3 can be pre-set according to the test points of the pressure boost calibration and the pressure relief calibration, respectively. The entire pressure calibration process includes the pressure boost calibration and the pressure relief calibration, wherein there are multiple test points for the pressure boost calibration and the pressure relief calibration, so as to completely test the accuracy of the part to be calibrated at various pressure values.

[0045] In this embodiment, the second target pressure value is greater than the pressure relief target pressure value by 1% to 2%.

[0046] In this embodiment, step S1 further includes:

[0047] After the purging is completed, the first on-off valve 5 is closed, so that the gas in the calibration pipeline 18 located downstream of the first on-off valve 5 is discharged from the pressure relief exhaust pipeline 19;

[0048] The output pressure of the first pressure regulating member 3 is adjusted to 0, so that the gas located upstream of the first on-off valve 5 can be discharged through the first pressure regulating member 3 to relieve pressure.

[0049] In this embodiment, the purge process is as follows:

[0050] Gas source 1 → pressure reducing valve 2 → first pressure regulating element 3 → first filter element 4 → first opening and closing valve 5 → gas container 6 → bypass pipe 7 → second filter element 8 → gas-liquid isolation element 9 → two-position three-way valve 10 → exhaust port 17 → third filter element 14 → gas recovery and purification treatment component 15.

[0051] Specifically, the gas source 1 provides the pressure medium for the device, and the pressure is reduced through the pressure reducing valve 2, and the pressure gas source covering the upper limit range of the first pressure regulating part 3 is provided as the input of the first pressure regulating part 3. The purge pressure value is set for the first pressure regulating part 3. When the upper limit of the first pressure regulating part 3 is greater than or equal to 2MPa, the purge pressure value is set to 2MPa purge; when the upper limit of the first pressure regulating part 3 is less than 2MPa, the purge pressure value is set to the upper limit pressure purge of the first pressure regulating part 3. Open the first on-off valve 5 and keep the second on-off valve 13 turned on and closed, connect the a and c ends of the two-position three-way valve 10 (the b end is disconnected), and the large amount of gas output by the first pressure regulating part 3 quickly passes through the first filter 4, the first on-off valve 5, the gas container 6, the bypass pipe 7, the second filter 8, the gas-liquid isolation part 9, and the two-position three-way valve 10 and then directly enters the exhaust port 17. Since the gas flows rapidly from the end of the first pressure regulating member 3 to the exhaust port 17 under a certain pressure, the nuclear radioactive material particles remaining in the filter element and the bypass pipe 7 can be taken away and discharged directly from the exhaust port 17, and then discharged after filtering and purification by the third filter element 14 and the gas recovery and purification component 15 arranged at the rear end of the exhaust port 17. The purge time can be set between 30s and 60s. After the purge, the first opening and closing valve 5 is disconnected first, and the gas downstream of the first opening and closing valve 5 is directly discharged to the atmosphere from the exhaust port 17 through the third filter element 14 and the gas recovery and purification component 15, and the pressure downstream of the first opening and closing valve 5 becomes 0. After the first opening and closing valve 5 is disconnected, the target pressure value of the first pressure regulating member 3 is set to 0, so that the pressure upstream of the first opening and closing valve 5 is relieved to 0 through the first pressure regulating member 3, and the initial state is restored, and the purge process is completed.

[0052] In this embodiment, the pressure regulation and boosting process of the first pressure regulating member 3 is specifically as follows:

[0053] Gas source 1 → pressure reducing valve 2 → first pressure regulating element 3 → first filter element 4 → first opening and closing valve 5 → gas container 6 → bypass pipe 7 → second filter element 8 → gas-liquid isolation element 9 → two-position three-way valve 10 → test interface 16.

[0054] Specifically, the gas source 1 provides the device with a pressure medium, which is reduced in pressure through the pressure reducing valve 2, and provides a pressure gas source covering the upper limit range of the first pressure regulating component 3 as the input of the first pressure regulating component 3. According to the first preset test point required by the part to be calibrated, the output pressure of the first pressure regulating component 3 is adjusted to the first target pressure value in sequence, so that the first pressure regulating component 3 performs target pressure control, the first on-off valve 5 is opened and the second on-off valve 13 is kept in a closed state when it is turned on, and the a and b ends of the two-position three-way valve 10 are connected (the c end is disconnected), and the standard pressure gas generated by the first pressure regulating component 3 is output to the test interface 16 after passing through the first filter element 4, the first on-off valve 5, the gas container 6, the bypass pipe 7, the second filter element 8, the gas-liquid isolation element 9, and the two-position three-way valve 10, for calibration of the pressure boosting process of the part to be calibrated. At this time, the first filter element 4, the second filter element 8 and the gas-liquid isolation element 9 are installed in reverse and do not play the role of filtering and isolation. When the device is pressurized, the pressure will push the gas to flow in the forward direction. At this time, there will be basically no reflux of radioactive substances. However, when the pressure gradually tends to a balanced state, the device pressure is balanced, and some water, oil, particulate matter, especially radioactive substances may reflux slightly in the reverse direction. When flowing in the reverse direction, the first filter element 4, the second filter element 8, and the gas-liquid isolation element 9 will play a major filtering role and filter out most of the impurities. The bypass tube 7 precipitates the remaining small amount of tiny particles, thereby providing sufficient protection for the first pressure regulating element 3.

[0055] In this embodiment, the pressure relief process is as follows:

[0056] Main pressure relief: test interface 16 → two-position three-way valve 10 → gas-liquid isolation component 9 → second opening and closing valve 13 → standard sensor 12 → second pressure regulating component 11 → exhaust port 17 → third filter element 14 → gas recovery and purification treatment component 15.

[0057] Accurate pressure relief: first pressure regulating component 3 → first filter component 4 → first opening and closing valve 5 → air container 6 → bypass pipe 7 → second filter component 8 → gas-liquid isolation component 9 → two-position three-way valve 10 → test interface 16.

[0058] Specifically, during the decompression process of the device, since the gas will flow back from the end of the part to be calibrated to the end of the first pressure regulating part 3, if the end of the part to be calibrated contains radioactive substances, it will flow into the first pressure regulating part 3 along with the reverse flow of the gas medium, causing contamination or even damage to the first pressure regulating part 3, and will also cause pollution to the surrounding environment. There is a certain pressure in the device. When the decompression operation needs to be performed, it is necessary to close the first on-off valve 5 first, open the second on-off valve 13, connect the a and b ends of the two-position three-way valve 10, and set the same second target pressure value that is 1% to 2% higher than the decompression target pressure value for the second pressure regulating part 11 and the first pressure regulating part 3. The pressure at the end of the part to be calibrated separated by the first opening and closing valve 5 will flow from the end of the part to be calibrated through the test interface 16, the two-position three-way valve 10, the gas-liquid isolation element 9, the second filter element 8, the second opening and closing valve 13, and the standard pressure sensor 12 to the second pressure regulating element 11. During the process, the gas-liquid isolation element 9 and the second filter element 8 will filter out most of the gas impurities and radioactive substances. The filtered gas will be exhausted to the exhaust port 17 through the second pressure regulating element 11 and then discharged from the device. The gas pressure between the first pressure regulating element 3 separated by the first opening and closing valve 5 and the first opening and closing valve 5 is directly discharged by the first pressure regulating element 3. When the pressures at both ends of the boundary of the first opening and closing valve 5 are both lowered to the second target pressure value and stabilized, the pressures at both ends of the first opening and closing valve 5 are the same, the device reaches a static pressure equilibrium state, and there is only a small difference from the pressure relief target pressure value. At this time, the first opening and closing valve 5 is opened, the second opening and closing valve 13 is closed, and then the first pressure regulating component 3 is set to the pressure relief target pressure value. The device pressure is refluxed from the calibrated component through the test interface 16, the two-position three-way valve 10, the gas-liquid isolation component 9, the second filter component 8, the bypass tube 7, the gas container 6, the first opening and closing valve 5, and the first filter component 4 to the first pressure regulating component 3, and is discharged from the first pressure regulating component 3. During the reflux process, the gas passes through the gas-liquid isolation element 9 to remove liquid impurities such as water and oil, and then passes through the two-stage filtration of the first filter element 4 and the second filter element 8, as well as the air blocking and precipitation of the bypass tube 7, so as to remove impurities in the gas medium and harmful radioactive substances, so that the gas medium flowing back to the first pressure regulating element 3 is clean and pollution-free. In this way, it can effectively prevent the reflux of nuclear radiation substances and the like from polluting or even damaging the first pressure regulating element 3, and can prevent the nuclear radiation substances from being discharged along with the gas medium when it is discharged through the first pressure regulating element 3 and polluting the surrounding environment.

[0059] In a specific embodiment, the specific use process of the anti-backflow pressure calibration device of the present invention is as follows:

[0060] 1. Open the gas source 1 and the pressure reducing valve 2, and adjust the pressure reducing valve 2 to an appropriate output pressure;

[0061] 2. The first pressure regulating member 3 and the backflow prevention assembly are turned on and purged according to the above purging process;

[0062] 3. After the purge process is completed, the device is preheated according to the preheating time of the first pressure regulating member 3 specified in the verification procedure or calibration specification;

[0063] 4. Connect the part to be calibrated to the test interface 16;

[0064] 5. The device is pressurized to the upper limit pressure required for calibration, and a leak test fluid is used to detect the air tightness of the pipe joints. After the test is completed, the pressure is reduced to 0;

[0065] 6. Carry out formal calibration of the calibration parts as needed, and perform step-up and step-down operations according to the procedures or specifications until the test is completed;

[0066] 7. After the test is completed, reduce the pressure of the device to 0 point to complete the calibration.

[0067] From the above description, it can be seen that the above-mentioned embodiments of the present invention achieve the following technical effects: by setting an anti-backflow component, the anti-backflow component includes a first on-off valve 5, a bypass tube 7 and a gas-liquid isolation member 9 which are sequentially arranged on the calibration pipeline 18, the first on-off valve 5 is arranged downstream of the first pressure regulating member 3, and is used to control the opening and closing of the calibration pipeline 18, the bypass tube 7 is used to adsorb gas impurities refluxed in the calibration pipeline 18, and the gas-liquid isolation member 9 is used to isolate liquid impurities in the calibration pipeline 18. In this way, when the pressure calibration device calibrates the calibrated parts for special purposes, such as pressure instruments used in the nuclear power field, the radioactive substances and radioactive particles and other impurities inside the parts will be isolated and adsorbed by the gas-liquid isolation member 9 and the bypass tube 7 even if they flow back into the pressure calibration device with the gas flow, so that the pressure calibration device cannot be contaminated or damaged, thereby ensuring the normal use of the pressure calibration device.

[0068] It should be noted that, in the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In addition, the terms used here are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should also be understood that when the terms "comprising" and / or "including" are used in this specification, it indicates the presence of features, steps, work, devices, components and / or combinations thereof.

[0069] In addition, the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A backflow prevention pressure calibration device, characterized in that: include: Gas source assembly, used to provide the gas required for calibration; A first pressure regulating member (3), the first pressure regulating member (3) being connected to the gas source component and being used for regulating the gas provided by the gas source component to a standard gas; A backflow prevention component, the backflow prevention component comprising a first on-off valve (5), a bypass pipe (7) and a gas-liquid isolation element (9) which are sequentially arranged on a calibration pipeline (18), the first on-off valve (5) being arranged downstream of the first pressure regulating element (3) and used for controlling the opening and closing of the calibration pipeline (18), the bypass pipe (7) being used for absorbing gas impurities that reflux in the calibration pipeline (18), and the gas-liquid isolation element (9) being used for isolating liquid impurities in the calibration pipeline (18); An output component, the output component comprising a test interface (16), the part to be calibrated being connected to the test interface (16); The backflow prevention assembly further comprises a first filter element (4) and a second filter element (8), wherein the first filter element (4) is arranged between the first on-off valve (5) and the first pressure regulating element (3), and the second filter element (8) is arranged between the gas-liquid isolation element (9) and the bypass pipe (7), and the filtering directions of the first filter element (4) and the second filter element (8) are opposite to the flow direction of the standard gas; The anti-backflow pressure calibration device further comprises a pressure relief exhaust pipeline (19), one end of the pressure relief exhaust pipeline (19) being connected in parallel to the calibration pipeline (18) and the connection point being located between the bypass pipe (7) and the second filter element (8); The anti-backflow assembly further comprises a second on-off valve (13) and a second pressure regulating member (11) which are sequentially arranged on the pressure relief exhaust pipeline (19); the second on-off valve (13) is used to control the opening and closing of the pressure relief exhaust pipeline (19); and the second pressure regulating member (11) is used to regulate the pressure of the gas discharged from the pressure relief exhaust pipeline (19).

2. The backflow prevention pressure calibration device according to claim 1, characterized in that: The anti-backflow pressure calibration device further comprises a gas recovery and purification processing component (15); the other end of the pressure relief exhaust pipeline (19) has an exhaust port (17); and the gas recovery and purification processing component (15) is connected to the exhaust port (17) of the pressure relief exhaust pipeline (19).

3. The backflow prevention pressure calibration device according to claim 2, characterized in that: The anti-backflow pressure calibration device further comprises a third filter element (14), wherein the third filter element (14) is arranged between the gas recovery and purification processing component (15) and the exhaust port (17).

4. The anti-backflow pressure calibration device according to any one of claims 1 to 3, characterized in that: The backflow prevention assembly further comprises a standard sensor (12), wherein the standard sensor (12) is arranged between the second on-off valve (13) and the second pressure regulating member (11) and is used to detect the pressure of the test interface (16) during pressure relief and exhaust.

5. The backflow prevention pressure calibration device according to claim 2 or 3, characterized in that: The anti-backflow assembly further comprises a two-position three-way valve (10), two interfaces of the two-position three-way valve (10) being connected to the calibration pipeline (18) and being located between the gas-liquid isolation component (9) and the test interface (16), and the third interface of the two-position three-way valve (10) being connected in parallel to the pressure relief exhaust pipeline (19) and the connection point being located between the second pressure regulating component (11) and the exhaust port (17).

6. The anti-backflow pressure calibration device according to any one of claims 1 to 3, characterized in that: The backflow prevention assembly further comprises an air container (6), wherein the air container (6) is arranged between the first on-off valve (5) and the bypass pipe (7).

7. A backflow prevention pressure calibration method, characterized in that: The pressure calibration is performed using the anti-backflow pressure calibration device according to any one of claims 1 to 6, the method comprising: Step S1: adjusting the output pressure of the first pressure regulating member (3) to a predetermined purging pressure value, opening the first on-off valve (5) and keeping the second on-off valve (13) of the anti-backflow assembly closed, and adjusting the two-position three-way valve (10) of the anti-backflow assembly to be connected to the pressure relief exhaust pipeline (19) and disconnected from the test interface (16), and purging the calibration pipeline (18); Step S2: sequentially adjusting the output pressure of the first pressure regulating component (3) to a predetermined first target pressure value, so as to adjust the gas provided by the gas source component to the standard gas, adjusting the two-position three-way valve (10) to be disconnected from the pressure relief exhaust pipeline (19) and connected to the test interface (16), connecting the part to be calibrated to the test interface (16), so as to perform a pressure-boosting calibration on the part to be calibrated; Step S3: After the pressure increase calibration is completed, the first on-off valve (5) is closed and the second on-off valve (13) is opened, and the output pressures of the first pressure regulating component (3) and the second pressure regulating component (11) of the anti-backflow assembly are simultaneously and sequentially lowered to a predetermined second target pressure value, so that the gas located downstream of the first on-off valve (5) in the calibration pipeline (18) is depressurized and discharged from the pressure relief exhaust pipeline (19), and the gas located upstream of the first on-off valve (5) is depressurized and discharged through the first pressure regulating component (3), thereby depressurizing the system; Step S4: After both ends of the first on-off valve (5) are depressurized to the second target pressure value and a static pressure equilibrium state is reached, the first on-off valve (5) is opened and the second on-off valve (13) is closed, and the output pressure of the first pressure regulating component (3) is adjusted to a predetermined depressurization target pressure value, wherein the second target pressure value is greater than the depressurization target pressure value, so that the gas in the calibration pipeline (18) is depressurized and discharged through the first pressure regulating component (3), thereby completing the depressurization calibration.

8. The anti-backflow pressure calibration method according to claim 7, characterized in that: The step S1 further comprises: After the purging is completed, the first on-off valve (5) is closed, so that the gas in the calibration pipeline (18) located downstream of the first on-off valve (5) is depressurized and discharged from the pressure relief exhaust pipeline (19); The output pressure of the first pressure regulating member (3) is adjusted to 0, so that the gas located upstream of the first on-off valve (5) is depressurized and discharged through the first pressure regulating member (3).

9. The anti-backflow pressure calibration method according to claim 7 or 8, characterized in that: The second target pressure value is 1% to 2% higher than the pressure relief target pressure value.

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