A vacuum breaking and vacuum pumping device and method dedicated to uranium enrichment main equipment

Abstract

The present invention belongs to the technical field of uranium enrichment processes and specifically discloses a vacuum breaking and evacuation device and method specifically designed for uranium enrichment main equipment. The device comprises an outer housing, an industrial control computer, a cart, a buffer tank, and a piping and valve system, the piping and valve system including an electric regulating valve. The outer housing is mounted on the top surface of the cart, the industrial control computer is mounted on the top surface of the outer housing, the buffer tank is mounted on the inner bottom of the cart, and the piping and valve system is mounted on the inner side of the cart. The buffer tank is connected to the piping and valve system, which is connected to a pressure meter. The electric regulating valve is equipped with a valve controller, and the pressure meter outputs signals to the industrial control computer, which establishes a bidirectional communication connection with the valve controller. The present invention can effectively improve control accuracy, reduce process time, and enhance efficiency.

Description

Technical Field

[0001] The present invention belongs to the technical field of uranium enrichment process, and in particular relates to a vacuum breaking and vacuum pumping device and method dedicated to uranium enrichment main equipment. Background Art

[0002] The overhaul of major equipment at a uranium enrichment plant involves a phased vacuum break / evacuation process for the main engine sections. This process requires over ten vacuum break / evacuation operations on the main engine sections. The main equipment in the centrifuge process is highly precise and operates under vacuum. To protect the centrifuges, the vacuum break / evacuation process places strict requirements on the rate of change of pressure within the target volume, as shown in Table 1.

[0003] Table 1 Requirements for pressure change rate during vacuum breaking / vacuuming

[0004]

[0005] Current vacuum breaker / evacuation control devices require an on-site operator to fine-tune a hand valve and control the rate of pressure change using a "timer." These devices imprecisely control the air intake rate, easily exceeding the required rate, and consume significant time and manpower. A single vacuum breaker or evacuation cycle takes approximately five hours, requiring the coordinated operation of five personnel for operation, monitoring, and parameter measurement. Summary of the Invention

[0006] The purpose of the present invention is to provide a vacuum breaking and vacuum pumping device and method dedicated to uranium enrichment main equipment. The device solves the problems of existing devices such as inaccurate control of the air intake rate and the need for a large amount of time and manpower. It eliminates the dependence of vacuum breaking / vacuum pumping operations on personnel, can effectively improve control accuracy, reduce process time, and improve efficiency.

[0007] The technical solution for achieving the purpose of the present invention is as follows:

[0008] A vacuum breaking and pumping device dedicated to uranium enrichment main equipment comprises: an outer cover, an industrial control computer, a cart, a buffer tank, and a pipeline and valve system, wherein the pipeline and valve system comprises an electric regulating valve; the outer cover is mounted on the top surface of the cart, the industrial control computer is mounted on the top surface of the outer cover, the buffer tank is mounted on the inner bottom of the cart, the pipeline and valve system is mounted on the inner side of the cart, the buffer tank is connected to the pipeline and valve system, the pipeline and valve system are connected to a pressure instrument, the electric regulating valve is equipped with a valve controller, the pressure instrument outputs a signal to the industrial control computer, and the industrial control computer and the valve controller are connected in a two-way communication manner.

[0009] The pipeline and valve system includes: a vacuum device interface, a nitrogen source interface, a centrifuge space interface, a first manual right-angle valve, a second manual right-angle valve, a third manual right-angle valve, a fourth manual right-angle valve, an electric regulating valve, a fifth manual right-angle valve, a flow limiting orifice plate and a seventh manual right-angle valve; the nitrogen source interface is connected to the centrifuge space interface via a buffer tank, the seventh manual right-angle valve, the first manual right-angle valve, the electric regulating valve, the second manual right-angle valve, the fifth manual right-angle valve and the flow limiting orifice plate; the centrifuge space interface is connected to the vacuum device interface via a flow limiting orifice plate, the fifth manual right-angle valve, the fourth manual right-angle valve, the electric regulating valve and the third manual right-angle valve.

[0010] The pipeline and valve system further includes a sixth right-angle valve, which is connected in parallel with the flow-limiting orifice plate and the fifth manual right-angle valve and serves as a bypass valve of the flow-limiting orifice plate.

[0011] The electric regulating valve is a one-way air intake regulating valve.

[0012] The buffer tank includes: a cylinder, a partition, a head, a concave flange, a container support, a hose bracket and a quick connector. One end of the cylinder is welded to the head, and the other end of the cylinder is installed with a quick connector. The bottom of the cylinder is welded to the container support. A hose bracket is installed on the side of the container support for placing a hose connected to the evaporation rack; the cylinder is installed with a partition to prevent the airflow from the inlet end of the cylinder from flowing directly to the outlet end; the end of the head is welded to the concave flange; the cylinder is connected to the cart through the container support.

[0013] The cart comprises a handle, a frame and casters, wherein the handle is installed on the side of the frame, the casters are installed on the bottom of the frame, and a bracket is installed inside the frame.

[0014] The outer cover includes: a protective cover, a front baffle, a rear baffle and side baffles. An industrial control computer bracket is installed on the top surface of the protective cover; an adjustment table bracket, a servo controller bracket, a pressure gauge bracket, a power supply bracket and a cable bracket are installed inside the protective cover; a cabinet door is installed on the rear baffle, the cabinet door is connected to the rear baffle by a hinge, and a door lock is installed on the cabinet door.

[0015] A method for breaking vacuum in a uranium enrichment main device, comprising the following steps:

[0016] Step (A1), check that the nitrogen source pressure and flow are stable, and connect the vacuum breaking operation circuit;

[0017] Step (A2): Power on the entire device and check whether the vacuum breaking operation circuit is normal;

[0018] Step (A3): close the electric regulating valve and open the right-angle valve of the vacuum breaking operation circuit;

[0019] Step (A4): pressurize the entire device. After receiving the pressure data, the industrial control computer adjusts the opening of the electric control valve so that the pressure increases according to the pressure change rate limit.

[0020] A method for vacuuming a uranium enrichment main device, comprising the following steps:

[0021] Step (B1), check that the vacuum pumping device is in standby mode and connect the vacuum pumping operation circuit;

[0022] Step (B2), power the entire device and check that the vacuum operation circuit is normal;

[0023] Step (B3), close the electric regulating valve and open the right-angle valve of the vacuum operation circuit;

[0024] Step (B4): evacuate the entire device, and the industrial control computer adjusts the opening of the electric control valve after receiving the pressure data, so that the pressure is reduced according to the pressure change rate limit requirement.

[0025] The beneficial technical effects of the present invention are:

[0026] The vacuum breaking and vacuum pumping device for uranium enrichment main equipment provided by this invention is automatically controlled by an electric regulating valve, eliminating the need for manual intervention. This effectively reduces reliance on operator skill, improves the pressure control accuracy of the centrifuge chamber, and reduces damage to the centrifuge caused by excessive airflow control during maintenance. This improves the safety, reliability, and automation level of the maintenance process, contributing to the intelligent development of the industry.

[0027] 2. The vacuum breaking and vacuum pumping device provided by the present invention for uranium enrichment main equipment effectively improves the vacuum breaking / vacuum pumping rate and work efficiency through the automatic control of the electric regulating valve and the design of the vacuum breaking circuit and vacuum pumping circuit.

[0028] 3. The vacuum breaking and vacuum pumping device provided by the present invention for uranium enrichment main equipment effectively reduces the number of operators and reduces labor costs through the automatic control of the electric regulating valve and the design of the vacuum breaking circuit and the vacuum pumping circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of a vacuum breaking / vacuum pumping device in the prior art;

[0030] Figure 2 This is a schematic structural diagram of a vacuum breaking and vacuum pumping device dedicated to a uranium enrichment main equipment provided by the present invention;

[0031] Figure 3 This is a schematic structural diagram of a cart in a vacuum breaking and vacuum pumping device dedicated to a uranium enrichment main equipment provided by the present invention;

[0032] Figure 4 This is a structural diagram of the pipeline and valve system in a vacuum breaking and vacuum pumping device dedicated to a uranium enrichment main equipment provided by the present invention;

[0033] Figure 5 This is a schematic diagram of a vacuum breaking and vacuum pumping device dedicated to a uranium enrichment main equipment provided by the present invention;

[0034] Figure 6 This is a schematic structural diagram of a buffer tank in a vacuum breaking and vacuum pumping device dedicated to a uranium enrichment main equipment provided by the present invention;

[0035] Figure 7 This is a schematic diagram of the front structure of the outer cover of a vacuum breaking and vacuum pumping device dedicated to a uranium enrichment main equipment provided by the present invention;

[0036] Figure 8 This is a schematic diagram of the back structure of the outer cover of a vacuum breaking and vacuum pumping device dedicated to a uranium enrichment main equipment provided by the present invention;

[0037] Figure 9 This is a control logic diagram of a vacuum breaking and vacuum pumping device dedicated to uranium enrichment main equipment provided by the present invention.

[0038] In the picture:

[0039] 1-outer cover; 2-industrial control computer; 3-cart; 4-buffer tank; 5-pipeline and valve system;

[0040] 11-adjustment table bracket; 12-protective cover; 13-industrial control computer bracket; 14-servo controller bracket; 15-pressure gauge bracket; 16-cabinet door; 17-door lock; 18-hinge; 19-power supply bracket; 110-cable bracket;

[0041] 31-handle; 32-frame; 33-castor;

[0042] 41-cylinder; 42-partition; 43-head; 44-concave flange; 45-container support; 46-hose bracket; 47-quick connector;

[0043] 51- Vacuum device interface; 52- Nitrogen source interface; 53- Centrifuge space interface; 55- First manual right-angle valve; 56- Second manual right-angle valve; 57- Third manual right-angle valve; 58- Fourth manual right-angle valve; 59- Electric regulating valve; 510- Fifth manual right-angle valve; 511- Flow limiting orifice; 512- Sixth manual right-angle valve; 513- Seventh manual right-angle valve; 514- Capacitive film pressure sensor. DETAILED DESCRIPTION

[0044] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0045] The principle diagram of vacuum breaking / vacuum pumping device in the prior art is as follows Figure 1 shown.

[0046] like Figure 2 As shown, the present invention provides a vacuum breaking and evacuation device specifically designed for uranium enrichment main equipment, comprising: an outer housing 1, an industrial control computer 2, a cart 3, a buffer tank 4, and a piping and valve system 5, the piping and valve system 5 including an electric control valve. The outer housing 1 is mounted on the top surface of the cart 3, and the industrial control computer 2 is mounted on the top surface of the outer housing 1, facilitating parameter viewing and electric control valve control. The buffer tank 4 is mounted on the inner bottom of the cart 3, and the piping and valve system 5 is mounted on the inner side of the cart 3, facilitating line switching and manual valve operation. The buffer tank 4 is connected to the piping and valve system 5, and power is supplied to the entire device via an external power supply. The piping and valve system 5 is connected to a pressure meter, and the electric control valve is equipped with a valve controller. The pressure meter outputs signals to the industrial control computer 2, and the industrial control computer 2 and the valve controller communicate bidirectionally.

[0047] The pipeline and valve system 5 has three pipe interfaces, connecting the centrifuge space, the nitrogen source, and the vacuum pump. During the vacuum break operation, gas from the nitrogen source enters the buffer tank 4, the electric control valve 59, the flow restriction orifice 511, and the centrifuge space in sequence. During the vacuum operation, nitrogen from the centrifuge space enters the electric control valve 59, the flow restriction orifice 511, and the vacuum pump in sequence.

[0048] like Figure 3 As shown, the cart 3 includes a handle 31, a frame 32, and casters 33. The handle 31 is mounted on the side of the frame 32, and the casters 33 are mounted on the bottom. Brackets are installed inside the frame 32 to secure the buffer tank 4 and the pipe and valve system 5. The main body of the frame 32 is welded from 60×40×2.5 and 40×40×2 stainless steel square tubes (S30408). The pipe brackets are 40×40×2 stainless steel square tubes (S30408). The handle 31 is bent from Φ32×2.5 stainless steel pipe. To enhance the cart's flexibility and convenience, the casters 33 are Fomar casters.

[0049] like Figure 4 As shown, the pipeline and valve system 5 includes: a vacuum device interface 51, a nitrogen source interface 52, a centrifuge space interface 53, a first manual right-angle valve 55, a second manual right-angle valve 56, a third manual right-angle valve 57, a fourth manual right-angle valve 58, an electric regulating valve 59, a fifth manual right-angle valve 510, a flow limiting orifice 511, a sixth manual right-angle valve 512 and a seventh manual right-angle valve 513.

[0050] The nitrogen source interface 52 is connected to the centrifuge space interface 53 through the buffer tank 4, the seventh manual right-angle valve 513, the first manual right-angle valve 55, the electric regulating valve 59, the second manual right-angle valve 56, the fifth manual right-angle valve 510, and the flow limiting orifice 511; the centrifuge space interface 53 is connected to the vacuum device interface 51 through the flow limiting orifice 511, the fifth manual right-angle valve 510, the fourth manual right-angle valve 58, the electric regulating valve 59, and the third manual right-angle valve 57.

[0051] The sixth right-angle valve 512 is connected in parallel with the flow-limiting orifice 511 and the fifth manual right-angle valve 510. It is a bypass valve of the flow-limiting orifice 511 and opens when the gas flow of the device is insufficient. The electric regulating valve 59 can only allow air to flow in one direction.

[0052] During the vacuum breaking operation, the seventh manual right-angle valve 513, the first manual right-angle valve 55, the second manual right-angle valve 56, and the fifth manual right-angle valve 510 are in the open state, and the third manual right-angle valve 57, the fourth manual right-angle valve 58, and the sixth manual right-angle valve 512 are in the closed state. The gas passes through the nitrogen source interface 52, the buffer tank 4, the seventh manual right-angle valve 513, the first manual right-angle valve 55, the electric regulating valve 59, the second manual right-angle valve 56, the fifth manual right-angle valve 510, the flow limiting orifice 511, and the centrifuge space interface 53 in sequence.

[0053] During the vacuum operation, the third manual right-angle valve 57, the fourth manual right-angle valve 58, and the fifth manual right-angle valve 510 are in the open state, and the first manual right-angle valve 55, the second manual right-angle valve 56, the sixth manual right-angle valve 512, and the seventh manual right-angle valve 513 are in the closed state. The gas passes through the centrifuge space interface 53, the flow limiting orifice 511, the fifth manual right-angle valve 510, the fourth manual right-angle valve 58, the electric regulating valve 59, the third manual right-angle valve 57, and the vacuum device interface 51 in sequence.

[0054] Pipeline and valve system 5 primarily consists of Φ32×2.5 stainless steel pipes, tees, elbows, manual right-angle valves, metal hoses, orifice plates, and other components. The manual right-angle valves are DN25 manual right-angle flapper valves. Except for the electric regulating valve, which is flange-connected, all other valves and pipelines are connected using quick-connect technology. The elbows, tees, and stainless steel pipes are connected using argon arc welding.

[0055] like Figure 6 As shown, the buffer tank 4 includes: a cylinder 41, a partition 42, a head 43, a concave flange 44, a container support 45, a hose bracket 46 and a quick connector 47.

[0056] One end of the cylinder 41 is welded to a sealing head 43, and the other end is fitted with a quick-connect fitting 47. The bottom of the cylinder 41 is welded to a container support 45. A hose bracket 46 is mounted on the side of the container support 45, which is used to accommodate the hose connected to the evaporation rack. A partition 42 is installed on the cylinder 41 to prevent airflow from the inlet to the outlet of the cylinder 41. The end of the sealing head 43 is welded to a recessed flange 44. The cylinder 41 is connected to the cart 3 via the container support 45. For ease of installation and maintenance, the container support 45 and the cart 3 are bolted together.

[0057] Buffer tank 4 has a capacity of 40L and a maximum operating pressure of 0.5MPa. It is welded together with a cylinder 41 made of a Φ377×6 S30408 steel pipe, a matching head 43, and a container support 45. The partition is made of 5mm thick S30408 steel plate.

[0058] like Figure 7-8 As shown, the housing 1 comprises a protective cover 12, a front baffle, a rear baffle, and side baffles. An industrial control computer bracket 13 is mounted on the top of the protective cover 12; inside the protective cover 12, a control gauge bracket 11, a servo controller bracket 14, a pressure gauge bracket 15, a power supply bracket 19, and a cable bracket 110 are mounted. A cabinet door 16 is mounted on the rear baffle, connected to the rear baffle via a hinge 18 and equipped with a door lock 17.

[0059] The outer cover 1 and the trolley 3 are connected by stainless steel bolts. All components on the outer cover 1 are made of S30408 with a material thickness of 2 mm. They are made by a bending forming process, and the parts are connected by argon arc spot welding.

[0060] The vacuum breaking and vacuum pumping device provided by the present invention is specially designed for uranium enrichment main equipment. The working principle of vacuum breaking and vacuum pumping is as follows:

[0061] The pressure meter is temporarily installed in the centrifuge space to measure the actual pressure P in the centrifuge space. The pressure data P is transmitted to the industrial control computer and processed to generate the pressure change rate ΔP. When P is in different pressure ranges, the industrial control computer calculates the target opening of the electric control valve by comparing the current opening of the electric control valve with the pressure control target value (see Table 1). The opening data is transmitted to the valve controller equipped with the electric control valve, and the electric control valve adjusts the opening to control the vacuum breaking-vacuuming rate. Its control logic is as follows: Figure 9 shown.

[0062] A method for breaking the vacuum of a uranium enrichment main equipment using a vacuum breaking and vacuum pumping device provided by the present invention specifically includes the following steps:

[0063] Step (A1): Check the nitrogen source pressure and flow rate to be stable and connect the vacuum breaking circuit.

[0064] Will Figure 5 The nitrogen source interface 52 is connected to the nitrogen source, the centrifuge space interface 53 is connected to the centrifuge space, and the pressure instrument is connected to the centrifuge space. Check that the sealing performance of the connection points is qualified.

[0065] Step (A2): Power on the entire device and check that the vacuum breaking circuit is normal.

[0066] Turn on the power supply of the device, supply power to the industrial control computer 2, the electric regulating valve 59, and the pressure instrument, check that the industrial control computer 2 operates normally, the pressure instrument readings are normal, and the opening control of the electric regulating valve 59 is normal.

[0067] Step (A3): Close the electric regulating valve 59 and open the right-angle valve of the vacuum breaking operation circuit.

[0068] Fully close the electric regulating valve 59, open the seventh manual right-angle valve 513, the first manual right-angle valve 55, the second manual right-angle valve 56, and the fifth manual right-angle valve 510, and close the third manual right-angle valve 57, the fourth manual right-angle valve 58, and the sixth manual right-angle valve 512.

[0069] Step (A4): pressurize the entire device. After receiving the pressure data, the industrial control computer 2 adjusts the opening of the electric regulating valve so that the pressure increases according to the pressure change rate limit in Table 1.

[0070] Open the nitrogen source valve to pressurize the entire device, and start industrial control computer 2. Industrial control computer 2 receives pressure data P transmitted by the pressure instrument connected to the centrifuge space, and generates a pressure change rate ΔP after processing. The pressure control target value is determined according to the pressure range in which P is located. Industrial control computer 2 calculates the target opening of the electric control valve by comparing the current opening of the electric control valve with the pressure control target value. The opening data is transmitted to the valve controller equipped with the electric control valve, and the electric control valve adjusts the opening so that the pressure increases according to the pressure change rate limit requirements in Table 1.

[0071] A method for vacuuming a uranium enrichment main equipment using a vacuum breaking and vacuuming device provided by the present invention specifically comprises the following steps:

[0072] Step (B1): Check that the vacuum pump is in standby mode and connect the vacuum pump circuit.

[0073] Will Figure 5 The vacuum device interface 51 is connected to the vacuum device, the centrifuge space interface 53 is connected to the centrifuge space, and the pressure instrument is connected to the centrifuge space. Check that the sealing performance of the connection points is qualified.

[0074] Step (B2): Power on the entire device and check that the vacuum operation circuit is normal.

[0075] Turn on the power supply of the device, supply power to the industrial control computer 2, the electric regulating valve 59, and the pressure instrument, check that the industrial control computer 2 operates normally, the pressure instrument readings are normal, and the opening control of the electric regulating valve 59 is normal.

[0076] Step (B3): Close the electric regulating valve 59 and open the right-angle valve of the vacuum operation circuit.

[0077] Fully close the electric regulating valve 59, open the third manual right-angle valve 57, the fourth manual right-angle valve 58, and the fifth manual right-angle valve 510, and close the first manual right-angle valve 55, the second manual right-angle valve 56, the sixth manual right-angle valve 512, and the seventh manual right-angle valve 513.

[0078] Step (B4): vacuumize the entire device. After receiving the pressure data, the industrial control computer 2 adjusts the opening of the electric regulating valve so that the pressure is reduced according to the pressure change rate limit in Table 1.

[0079] Start the vacuuming device to evacuate the entire device, and start the industrial control computer 2. The industrial control computer 2 receives the pressure data P transmitted by the pressure instrument connected to the centrifuge space, generates the pressure change rate ΔP after processing, and determines the pressure control target value according to the pressure range in which P is located. The industrial control computer 2 calculates the target opening of the electric control valve by comparing the current opening of the electric control valve with the pressure control target value, and transmits the opening data to the valve controller equipped with the electric control valve. The electric control valve adjusts the opening so that the pressure is reduced according to the pressure change rate limit requirements in Table 1.

[0080] By using the vacuum breaking and vacuum pumping device for uranium enrichment main equipment provided by the present invention to perform vacuum breaking / vacuum pumping operations, the need for manual control of airflow rate is eliminated. Through experimental tests, the actual vacuum breaking / vacuum pumping rate can be increased to 90% of the maximum limit, or even higher, thereby shortening the vacuum breaking / vacuum pumping process time from 5 hours to 1.5 hours, greatly improving work efficiency.

[0081] At the same time, the device of the present invention improves the control accuracy of the pressure change rate from the original ±45% to 5%, making the centrifuge safer during vacuum breaking / vacuuming and reducing damage.

[0082] In addition, the use of the new device can reduce the number of vacuum breaking / vacuuming operators from 5 to 2, avoiding waste of human resources.

[0083] This shows that the control performance of the vacuum breaking / vacuuming automatic control device is reliable and effective. Based on the above results, the following evaluation is made on the device of the present invention:

[0084] Take our company's existing original device as an example to analyze the application of the device of the present invention

[0085] 1. Effectively save labor costs

[0086] Using the original device, a single vacuum break or vacuum pumping operation took approximately 5 hours. Overhauling a single-section centrifuge fleet required at least 6 vacuum breaks and 9 vacuum pumping operations, totaling 75 hours of vacuum break and vacuum pumping time. This operation required constant monitoring of the pressure gauge, recording and calculating the rate of pressure change, and adjusting the manual valve opening at all times, requiring the coordinated efforts of five operators on-site. Using the device of the present invention, a single vacuum break or vacuum pumping operation took approximately 1.5 hours, totaling 22.5 hours. The operation only required preparation, which was completed automatically after the device was turned on, requiring only two operators on-site. The new device is expected to reduce the maintenance time of a single-section centrifuge fleet from 375 man-hours to 45 man-hours. If all centrifuge operations used the new device for vacuum break / vacuum pumping, it is expected to save 14,850 man-hours. Based on an average labor cost of 100 yuan per person-hour, this translates to a total savings of 1.485 million yuan.

[0087] 2. Effectively shorten the separation work cost generated by the construction period

[0088] Using the original device, the maintenance cycle of a single-section centrifuge group was about 16 days. After using the new device, the maintenance cycle was reduced to 9 days.

[0089] If the centrifugal engineering uses the device of the present invention to perform vacuum breaking / vacuum pumping operations, the section exit time can be reduced by 315 days, and the average daily separation work benefit of a single section is 17,700 yuan, thus generating a separation work benefit of approximately 5.57 million yuan.

[0090] In summary, after the new device is applied in the current uranium enrichment field, for centrifuge engineering, each centrifuge maintenance can save economic benefits of approximately 7.055 million yuan.

[0091] In addition, if the device is used at the start of a newly built centrifugal project, it can greatly reduce manpower consumption and shorten the construction period, and the economy will be better.

[0092] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. A vacuum breaking and vacuum pumping device dedicated to uranium enrichment main equipment, characterized in that: The device comprises: an outer cover (1), an industrial control computer (2), a cart (3), a buffer tank (4) and a pipeline and valve system (5), wherein the pipeline and valve system (5) comprises an electric regulating valve; the outer cover (1) is mounted on the top surface of the cart (3), the industrial control computer (2) is mounted on the top surface of the outer cover (1), the buffer tank (4) is mounted on the inner bottom of the cart (3), the pipeline and valve system (5) is mounted on the inner side of the cart (3), the buffer tank (4) is connected to the pipeline and valve system (5), the pipeline and valve system (5) are connected to a pressure meter, the electric regulating valve is equipped with a valve controller, the signal of the pressure meter is output to the industrial control computer (2), and the industrial control computer (2) and the valve controller are connected in a two-way communication manner; The pipeline and valve system (5) includes: a vacuum device interface (51), a nitrogen source interface (52), a centrifuge space interface (53), a first manual right-angle valve (55), a second manual right-angle valve (56), a third manual right-angle valve (57), a fourth manual right-angle valve (58), an electric regulating valve (59), a fifth manual right-angle valve (510), a flow limiting orifice (511) and a seventh manual right-angle valve (513); the nitrogen source interface (52) is connected to the buffer tank (4), the seventh manual right-angle valve (511) and the seventh manual right-angle valve (513). The right-angle valve (513), the first manual right-angle valve (55), the electric regulating valve (59), the second manual right-angle valve (56), the fifth manual right-angle valve (510), and the flow-limiting orifice (511) are connected to the centrifuge space interface (53); the centrifuge space interface (53) is connected to the vacuum device interface (51) via the flow-limiting orifice (511), the fifth manual right-angle valve (510), the fourth manual right-angle valve (58), the electric regulating valve (59), and the third manual right-angle valve (57); The pipeline and valve system (5) further includes a sixth right-angle valve (512), which is connected in parallel with the flow-limiting orifice plate (511) and the fifth manual right-angle valve (510), and serves as a bypass valve of the flow-limiting orifice plate (511); The buffer tank (4) comprises: a cylinder (41), a partition (42), a head (43), a concave flange (44), a container support (45), a hose bracket (46) and a quick connector (47); one end of the cylinder (41) is welded to the head (43); the other end of the cylinder (41) is installed with the quick connector (47); the bottom of the cylinder (41) is welded to the container support (45); a hose bracket (46) is installed on the side of the container support (45) for placing a hose connected to the evaporation rack; the cylinder (41) is installed with a partition (42) to prevent airflow from the inlet end of the cylinder (41) directly flowing to the outlet end; the end of the head (43) is welded to the concave flange (44); the cylinder (41) is connected to the trolley (3) through the container support (45); The cart (3) comprises a handle (31), a frame (32) and casters (33); the handle (31) is installed on the side of the frame (32); the casters (33) are installed on the bottom of the frame (32); and a bracket is installed inside the frame (32).

2. A vacuum breaking and vacuum pumping device dedicated to uranium enrichment main equipment according to claim 1, characterized in that: The electric regulating valve (59) is a one-way air intake regulating valve.

3. The vacuum breaking and vacuum pumping device for uranium enrichment main equipment according to claim 1, characterized in that: The outer cover (1) comprises: a protective cover (12), a front baffle, a rear baffle and side baffles; an industrial control computer bracket (13) is installed on the top surface of the protective cover (12); a regulating meter bracket (11), a servo controller bracket (14), a pressure gauge bracket (15), a power supply bracket (19) and a cable bracket (110) are installed inside the protective cover (12); a cabinet door (16) is installed on the rear baffle, the cabinet door (16) is connected to the rear baffle through a hinge (18), and a door lock (17) is installed on the cabinet door (16).

4. A method for breaking vacuum in a main uranium enrichment device, using a vacuum breaking and vacuum pumping device dedicated to a main uranium enrichment device according to claim 2, characterized in that: The method comprises the following steps: Step (A1), check that the nitrogen source pressure and flow are stable, and connect the vacuum breaking operation circuit; Step (A2): Power on the entire device and check whether the vacuum breaking operation circuit is normal; Step (A3), closing the electric regulating valve (59), and opening the right-angle valve of the vacuum breaking operation circuit; Step (A4): pressurize the entire device. After receiving the pressure data, the industrial control computer (2) adjusts the opening of the electric regulating valve so that the pressure increases according to the pressure change rate limit.

5. A method for vacuuming a main uranium enrichment device, using a vacuum breaking and vacuuming device dedicated to a main uranium enrichment device according to claim 2, characterized in that: The method comprises the following steps: Step (B1), check that the vacuum pumping device is in standby mode and connect the vacuum pumping operation circuit; Step (B2), power the entire device and check that the vacuum operation circuit is normal; Step (B3), closing the electric regulating valve (59), and opening the right-angle valve of the vacuum operation circuit; Step (B4): evacuate the entire device, and the industrial control computer (2) adjusts the opening of the electric regulating valve after receiving the pressure data, so that the pressure is reduced according to the pressure change rate limit requirement.

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