Automatic pressure charging device and method for pressure cooker

Abstract

The present application belongs to the technical field of isotope separation, and particularly relates to an automatic pressure charging device and method for a pressure tank. The present application comprises an exhaust pipeline I, an air compressor, a three-way electric valve, a nitrogen cylinder, an exhaust pipeline II and a gas charging gasket. The air outlet of the air compressor is connected with the exhaust pipeline I through a pipeline. The air outlet of the air compressor is connected with the first three-way through a pipeline. The second way of the first three-way is connected with the pressure tank. The third way of the first three-way is connected with the first interface of the three-way electric valve. The second interface of the three-way electric valve is connected with the nitrogen cylinder. The third interface of the three-way electric valve is connected with the exhaust pipeline II and the gas charging gasket in parallel. The present application has the functions of automatic pressure charging, pressure monitoring, pressure alarm, power failure alarm and automatic interlocking conversion to nitrogen pressure charging after power failure, and can realize one-key automatic pressure tank airtightness detection. The present application can solve the problems of complicated airtightness detection process, long time and large consumption of manpower.

Description

Technical Field

[0001] This invention belongs to the field of isotope separation technology, specifically relating to an automatic pressurization device and pressurization method for a pressure vessel. Background Technology

[0002] Autoclaves are used for liquefaction and homogenization in isotope separation processes. Liquefaction and homogenization involves loading a 3m thick container with the working substance... 3 (C) The container is placed in a pressure vessel, and the working substance is fully liquefied by step heating to achieve uniform abundance.

[0003] The doors of autoclaves are heavy, and gravity causes deformation during long-term use. Wear and tear reduces the fit between the tank body and the door. Existing extruded rubber ring seals cannot fully compensate for the deformation, and their sealing performance is substandard. Therefore, a new type of inflatable sealing gasket is adopted.

[0004] Currently, the existing pressurization devices in China involve manual operation of starting the air compressor, monitoring and recording the pressurization pressure, and opening and closing valves for pressurization and depressurization. Because the testing process is lengthy, cumbersome, time-consuming, and labor-intensive, there are also issues such as power outages that are difficult to detect in a timely manner.

[0005] Due to technological blockades and barriers imposed by the uranium enrichment industry abroad on similar equipment, it is currently impossible to understand the relevant technologies of the autoclave sealing device. Summary of the Invention

[0006] The technical problem solved by this invention is that it provides an automatic pressurization device and method for a compressive heat vessel, which has functions such as automatic pressurization, pressure monitoring, pressure alarm, power failure alarm, and automatic interlocking to switch to nitrogen pressurization after power failure. It can realize one-click automatic airtightness detection of the compressive heat vessel and solve the problems of cumbersome, time-consuming and labor-intensive airtightness detection process of the compressive heat vessel.

[0007] The technical solution adopted in this invention is as follows:

[0008] An automatic pressurization device for a compressor includes an exhaust pipe, an air compressor, a three-way electric valve, a nitrogen cylinder, an exhaust pipe, and an inflation gasket. The air outlet of the air compressor is connected to the exhaust pipe, the air delivery end of the air compressor is connected to the first three-way valve, the second port of the first three-way valve is connected to the compressor, the third port of the first three-way valve is connected to the first port of the three-way electric valve, the second port of the three-way electric valve is connected to the nitrogen cylinder, and the third port of the three-way electric valve is connected in parallel to the exhaust pipe and the inflation gasket.

[0009] An electric valve is installed on the connecting pipe between the air compressor and the exhaust pipe.

[0010] The pipeline between the air compressor and the pressure vessel is equipped with an electric valve 2, a remote digital pressure gauge 1, a mechanical pressure gauge 1, and an electric valve 3. The electric valve 2 is connected to the electric valve 3. The remote digital pressure gauge 1 and the mechanical pressure gauge 1 are installed in parallel on the pipeline between the two valves. The end of the electric valve 3 without a pressure gauge is connected to the pressure vessel.

[0011] An electric valve is installed on the pipeline connecting the third port and the first interface.

[0012] The second interface is connected to the nitrogen cylinder via a pipeline equipped with a remote digital pressure gauge 2, a pressure reducing valve, a remote digital pressure gauge 3, and an electric valve 5. The second interface is connected to the low-pressure end of the pressure reducing valve, and a remote digital pressure gauge 2 is installed on the pipeline between the second interface and the pressure reducing valve. The high-pressure end of the pressure reducing valve is connected to the electric valve 5, and a remote digital pressure gauge 3 is installed on the pipeline between the electric valve 5 and the nitrogen cylinder.

[0013] The exhaust pipe 2 is equipped with an electric valve 6.

[0014] A remote digital pressure gauge and a mechanical pressure gauge are installed on the pipe between the exhaust pipe and the inflatable gasket.

[0015] The pressurization method for an automatic pressurization device for a compressive heat vessel includes the following steps:

[0016] After checking that the compressor is in good condition, the second port of the three-way electric valve is automatically closed, and the electric valve is automatically opened. The five-way electric valve is checked to see if the reading of the remote digital pressure gauge is greater than 0.75 MPa. If it is greater, it is normal; if it is lower, it is abnormal to indicate that the nitrogen cylinder is in an abnormal state.

[0017] The device self-tests the valves, automatically resetting them to their initial state: electric valve one is closed, electric valve two is closed, electric valve three is closed, electric valve four is open, the second port of the three-way electric valve is cut off, and electric valve six is ​​closed.

[0018] The compressor starts automatically and closes when the pressure at digital pressure gauge 4 is between 0.65-0.75 MPa. Electric valve 4 then closes automatically, while electric valve 2 and electric valve 3 open.

[0019] The air compressor continues to operate until the remote digital pressure gauge reaches 0.65 MPa, then automatically closes electric valves 2 and 3, cutting off the pressure tank.

[0020] Then, the electric valve four is automatically opened, and the air compressor maintains the pressure at four points on the remote digital pressure gauge between 0.65-0.75 MPa to ensure the pressure inside the air gasket and achieve a sealing effect.

[0021] After closing the electric valve 2, the vacuum test begins, and the value PN of the remote digital pressure gauge 1 is automatically recorded every hour.

[0022] The system automatically determines every hour whether ΔP = PN - PN + 1 < 1 kPa / h; otherwise, it displays an unqualified result and triggers an audible and visual alarm.

[0023] After the airtightness of the autoclave is checked and found to be qualified, liquefaction work is carried out. Electric valves 1, 2, 6, and the second port of the electric three-way valve will automatically close, while electric valve 4 will automatically open, automatically starting the air compressor and maintaining the pressure at four points on the remote digital pressure gauge between 0.65-0.75 MPa. After the work is completed, the workers can choose to stop the air compressor and open electric valve 6 to release pressure and exhaust air.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] (1) The present invention provides an automatic pressurizing device and pressurizing method for a pressure vessel, which improves the work efficiency of staff and saves time and effort.

[0026] (2) The present invention provides an automatic pressurizing device and pressurizing method for a compressor, which has a spare nitrogen cylinder that can replace the air compressor when the power is off, ensuring that the system works without interruption during power outages and ensuring the airtightness of the compressor.

[0027] (3) The present invention provides an automatic pressurization device and pressurization method for a pressure vessel, which has the ability to detect the pressure status of a nitrogen cylinder and has an alarm reminder function.

[0028] (4) The present invention provides an automatic pressurizing device and pressurizing method for a pressure vessel, which fully automates the process of pressure vessel air tightness detection and can automatically record pressure vessel data and determine whether the air tightness is qualified.

[0029] (5) The present invention provides an automatic pressurization device and pressurization method for a pressure vessel, which has functions such as automatic pressurization, pressure monitoring, pressure alarm, power failure alarm and automatic interlocking to nitrogen pressurization after power failure. It can realize one-click automatic air tightness detection of the pressure vessel; it can solve the problem that the air tightness detection process of the pressure vessel is cumbersome, time-consuming and consumes a lot of manpower. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an automatic pressurizing device and pressurizing method for a pressure vessel provided by the present invention.

[0031] In the diagram: 1. Exhaust pipe one; 2. Electric valve one; 3. Air compressor; 4. Electric valve two; 5. Remote digital pressure gauge one; 6. Mechanical pressure gauge one; 7. Electric valve three; 8. Autoclave; 9. Electric valve four; 10. Three-way electric valve; 11. Remote digital pressure gauge two; 12. Pressure reducing valve; 13. Remote digital pressure gauge three; 14. Electric valve five; 15. Nitrogen cylinder; 16. Electric valve six; 17. Exhaust pipe two; 18. Remote digital pressure gauge four; 19. Mechanical pressure gauge two; 20. Inflatable gasket. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] like Figure 1As shown, the present invention provides an automatic pressurizing device and pressurizing method for a compressor tank, comprising an exhaust pipe 1, an electric valve 2, an air compressor 3, an electric valve 4 9, a three-way electric valve 10, a nitrogen cylinder 15, an electric valve 6 16, an exhaust pipe 2 17, a remote digital pressure gauge 4 18, a mechanical pressure gauge 2 19, and an inflation gasket 20. The air outlet of the air compressor 3 is connected to the exhaust pipe 1 via a pipe, and an electric valve 2 is installed on the connecting pipe. The air supply end of the air compressor 3 is connected to the first three-way valve, and the second port of the first three-way valve is connected to the compressor tank 8. An electric valve 2 4, a remote digital pressure gauge 5, a mechanical pressure gauge 6, and an electric valve 3 7 are installed on the pipeline between the air compressor 3 and the compressor tank 8. Electric valve 2 4 is connected to electric valve 3 7. A remote digital pressure gauge 5 and a mechanical pressure gauge 6 are installed in parallel on the pipeline between the two valves. The end of electric valve 3 7 without a pressure gauge is connected to the compressor tank 8. The third port of the first tee is connected to the first interface of the tee electric valve 10. An electric valve 9 is installed on the connecting pipe. The second interface of the tee electric valve 10 is connected to the nitrogen cylinder 15. A remote digital pressure gauge 11, a pressure reducing valve 12, a remote digital pressure gauge 13, and an electric valve 14 are installed on the connecting pipe. The second interface is connected to the low-pressure end of the pressure reducing valve 12. A remote digital pressure gauge 11 is installed on the pipe between the pressure reducing valve 12 and the pressure reducing valve 12. The high-pressure end of the pressure reducing valve 12 is connected to the electric valve 14. A remote digital pressure gauge 13 is installed on the pipe between the electric valve 14 and the nitrogen cylinder 15. The third interface of the tee electric valve 10 is connected in parallel to the electric valve 16 and the inflation gasket 20. A remote digital pressure gauge 18 and a mechanical pressure gauge 19 are installed on the pipe between the electric valve 16 and the inflation gasket 20. The electric valve 16 is connected to the exhaust pipe 17.

[0036] The present invention provides a method for pressurizing a pressure vessel, comprising the following steps:

[0037] S1. Power-on self-test: The PLC checks and closes the second interface of the three-way electric valve 10, automatically opens the electric valve 14, and the remote digital pressure gauge 13 collects the pressure and transmits it to the PLC. The PLC checks whether the reading is greater than 0.75 MPa. If it is less than 0.75 MPa, it outputs to the human-machine interface to show that the nitrogen cylinder 15 is in an abnormal state and provides an audible and visual reminder.

[0038] S2, PLC controls the electric valves to automatically reset to their initial state: Electric valve 1 (2) closed, electric valve 2 (4) closed, electric valve 3 (7) closed, electric valve 4 (9) open, three-way electric valve 10 (second port cut off), electric valve 6 (16) closed, electric valve 5 (14) open.

[0039] S3, PLC executes automatic start of air compressor 3.

[0040] S4. After starting the air compressor 3, the remote digital pressure gauge 418 collects the pressure value and transmits it to the PLC. When the PLC determines that the value is between 0.65-0.75 MPa, it closes the electric valve 49 and opens the electric valves 24 and 37 to pressurize the pressure tank 8.

[0041] S5, the remote digital pressure gauge 5 collects data and transmits it to the PLC. After the compressor starts, it checks whether the data collected by the remote digital pressure gauge 5 is greater than 0.34 MPa 2.5 hours later. If it is not reached, the compressor stops and the human-machine interface displays an abnormal status and provides an audible and visual warning.

[0042] S6. The remote digital pressure gauge 5 collects data and transmits it to the PLC. When the PLC determines that the value reaches 0.65 MPa, it automatically closes the electric valve 4. After the compressor starts, it checks the data collected by the remote digital pressure gauge 5 after 6.5 hours to see if it is greater than 0.65 MPa. If it is not, it stops the compressor, displays an abnormal status on the human-machine interface, and provides an audible and visual warning.

[0043] After the S7 and PLC control closes the electric valve 4, it controls the opening of the electric valve 9, and maintains the pressure at the remote digital pressure gauge 18 between 0.65-0.75 MPa by controlling the start / stop of the air compressor 3.

[0044] S8. After closing the electric valve 4, the vacuum test begins, and the value PN of the remote digital pressure gauge 5 is automatically recorded every hour and displayed on the human-machine interface.

[0045] S9. Automatically determine △P=PN-PN+1<1kpa / h every hour; otherwise, display "unqualified" and issue an audible and visual alarm.

[0046] S10, 12 hours later, if there is no unqualified △P, it will be displayed as qualified, and the PLC will control the automatic shutdown of the air compressor 3, open electric valve 1, 2, and electric valve 5 to exhaust.

[0047] S11. If a power outage occurs during this period, the UPS will be started to provide power. The PLC will control electric valve 4 and electric valve 9 to automatically close, and electric three-way valve 10 port 2 will be automatically connected, and an audible and visual alarm will be issued.

[0048] S12. Non-airtightness test of the autoclave: During liquefaction operation, the PLC controls electric valve 12, electric valve 24, electric valve 616, and electric three-way valve 10 interface 2 to automatically close, while electric valve 49 is automatically opened, and the air compressor 3 is automatically started. By repeatedly starting and stopping the air compressor, the pressure at the remote digital pressure gauge 418 is maintained between 0.65-0.75 MPa.

[0049] This invention is applicable to the automatic pressurization and sealing inspection of the gas-filled sealing ring of a compressor. The pressurization device features automatic pressurization, pressure monitoring, pressure alarm, power outage alarm, and automatic interlocking to nitrogen pressurization after a power outage. It can achieve one-button automatic airtightness testing of the compressor, providing constant pressure to the gas-filled sealing ring of the compressor and ensuring its normal operation.

[0050] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0051] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An automatic pressurizing device for a pressure vessel, characterized in that, Includes exhaust pipe one (1), air compressor (3), three-way electric valve (10), nitrogen cylinder (15), exhaust pipe two (17), and inflation gasket (20). The air outlet of the air compressor (3) is connected to exhaust pipe one (1) through a pipe. The air delivery end of the air compressor (3) is connected to the first three-way valve. The second port of the first three-way valve is connected to the pressure heat tank (8). The third port of the first three-way valve is connected to the first interface of the three-way electric valve (10). The second interface of the three-way electric valve (10) is connected to the nitrogen cylinder (15). The third interface of the three-way electric valve (10) is connected in parallel to exhaust pipe two (17) and inflation gasket (20). An electric valve (2) is provided on the connecting pipe between the air compressor (3) and the exhaust pipe (1). The pipeline between the air compressor (3) and the pressure vessel (8) is equipped with an electric valve 2 (4), a remote digital pressure gauge 1 (5), a mechanical pressure gauge 1 (6), and an electric valve 3 (7). The electric valve 2 (4) is connected to the electric valve 3 (7). The remote digital pressure gauge 1 (5) and the mechanical pressure gauge 1 (6) are installed in parallel on the pipeline between the two valves. The electric valve 3 (7) without a pressure gauge is connected to the pressure vessel (8). An electric valve four (9) is installed on the pipeline connecting the third port of the first tee to the first interface. The second interface is connected to the nitrogen cylinder (15) via a pipeline equipped with a remote digital pressure gauge 2 (11), a pressure reducing valve (12), a remote digital pressure gauge 3 (13), and an electric valve 5 (14). The second interface is connected to the low-pressure end of the pressure reducing valve (12), and a remote digital pressure gauge 2 (11) is installed on the pipeline between the pressure reducing valve (12). The high-pressure end of the pressure reducing valve (12) is connected to the electric valve 5 (14). A remote digital pressure gauge 3 (13) is installed on the pipeline between the pressure reducing valve (12) and the electric valve 5 (14). The electric valve 5 (14) is connected to the nitrogen cylinder (15). The exhaust pipe 2 (17) is equipped with an electric valve 6 (16); A remote digital pressure gauge four (18) and a mechanical pressure gauge two (19) are installed on the pipe between the exhaust pipe two (17) and the inflatable gasket (20).

2. The pressurization method based on the automatic pressurization device for a compressive heat vessel according to claim 1, characterized in that, Includes the following steps: After checking that the compressor (3) is in good condition, the second port of the three-way electric valve (10) is automatically closed, and the electric valve five (14) is automatically opened. The remote digital pressure gauge three (13) is judged to see if the reading is greater than 0.75 MPa. If it is greater, it is normal; if it is lower, it is abnormal. The device self-tests the valves and automatically resets them to the initial state. Electric valve one (2) is closed, electric valve two (4) is closed, electric valve three (7) is closed, electric valve four (9) is open, the second port of the three-way electric valve (10) is cut off, and electric valve six (16) is closed. Automatically start the air compressor (3) until the pressure at digital pressure gauge four (18) is 0.65-0.75 MPa, then automatically close electric valve four (9), open electric valve two (4), and open electric valve three (7); The compressor (3) continues to work until the remote digital pressure gauge (5) reaches 0.65 MPa, then automatically closes the electric valve (4) and electric valve (7) to cut off the pressure tank (8). Then the electric valve four (9) is automatically opened, and the air compressor (3) maintains the pressure at the remote digital pressure gauge four (18) between 0.65-0.75 MPa to ensure the pressure inside the air gasket and provide a sealing effect. After closing the electric valve 2 (4), the vacuum test begins, and the value P of the remote digital pressure gauge 1 (5) is automatically recorded every hour. N .

3. The method according to claim 2, characterized in that, Automatically determine △P=P every hour N -P N＋1 <1 kPa / h, otherwise it will display as unqualified and trigger an audible and visual alarm.

4. The method according to claim 3, characterized in that, After the air tightness of the autoclave is checked and found to be qualified, liquefaction work is carried out. Electric valve 1 (2), electric valve 2 (4), electric valve 6 (16), and the second port of the three-way electric valve (10) are automatically closed, electric valve 4 (9) is automatically opened, and the air compressor (3) is automatically started to maintain the pressure at the remote digital pressure gauge 4 (18) between 0.65-0.75 MPa. After the work is completed, the staff selects to stop the air compressor (3) and opens electric valve 6 (16) to release pressure and exhaust air.

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