Shielded main pump motor stator leak detection test high-pressure inflation device
By designing the series and parallel connection of low-pressure nitrogen cylinder group, high-pressure nitrogen storage tank and booster pump, the problem of insufficient nitrogen pressure in the stator leakage detection test of the shielded main pump motor is solved, and efficient nitrogen utilization and test pressure are achieved. The device is simple and cost-effective.
Patent Information
- Application Number
- CN202422135845.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-07-08
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The prior art cannot meet the high-pressure nitrogen supply required for the stator leak detection test of shielded main pump motors, and the nitrogen utilization rate is low.
A high-pressure inflation device consisting of a low-pressure nitrogen cylinder group, a high-pressure nitrogen storage tank, a pressure reducing valve and a booster pump is designed. Through series and parallel connections, the booster and storage of nitrogen is realized, ensuring the test pressure requirements, and the efficient utilization of nitrogen is achieved through the pressure relief branch.
The high-pressure nitrogen supply required for the stator leak detection test is realized, which improves the utilization rate of nitrogen, and the device design is simple and easy to maintain and has a low cost.
Smart Images
Figure CN223076726U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a high-pressure gas charging device for leakage detection test of the stator of a canned motor pump. Background Art
[0002] The canned motor pump has the characteristics of high safety, full sealing, compact structure, small floor area, and stable operation. The motor of the canned motor pump houses the motor and all rotor components within its pressure-bearing housing. The pressure-bearing housing includes a stator housing and a stator end cover, and bears all the pressures of the reactor coolant system. And in the event of the most hypothetical accident, it contains the radioactive products generated by the fission reaction. Summary of the Invention
[0003] The purpose of the utility model is to provide a high-pressure gas charging device for leakage detection test of the stator of a canned motor pump, which has a relatively simple design, is easy to maintain, has a lower cost, and has achieved good results in use. The technical solution of the utility model is as follows: a high-pressure gas charging device for leakage detection test of the stator of a canned motor pump, which is composed of a low-pressure nitrogen gas cylinder group (11), a high-pressure nitrogen gas storage tank (10), a pressure reducing valve (7), and a booster pump (13). The low-pressure nitrogen gas cylinder group (11) is connected in series with a high-pressure gas source group (15). The high-pressure gas source group (15) is successively composed of a second stop valve (14), a booster pump (13), a third stop valve (12), a high-pressure nitrogen gas storage tank (10), and a fourth stop valve (9) connected in series. A first stop valve (8) is connected in parallel with the high-pressure gas source group (15) and then successively connected to a pressure reducing valve (7), a second pressure gauge (6), a fifth stop valve (5), and a first pressure gauge (2), and finally connected to the winding cavity of the stator (1). A pressure relief branch (16) is provided between the pipeline of the fifth stop valve (5) and the first pressure gauge (2). The open end of the pressure relief branch (16) leads to the external atmosphere. The pressure relief branch (16) is composed of a sixth stop valve (3) and an overpressure rupture disc (4) connected in parallel.
[0004] Working Principle of the Utility Model
[0005] As Figure 1 shown, it is a schematic diagram of the high-pressure gas charging device for leakage detection test of the stator of the canned motor pump of the utility model, which is connected and composed of a stator (1), a first pressure gauge (2) and a second pressure gauge (6), a first stop valve (8), a second stop valve (14), a third stop valve (12), and a fourth stop valve (9), an overpressure rupture disc (4), a pressure reducing valve (7), a high-pressure storage tank (10), a booster pump (13), and a standard nitrogen gas cylinder group (11).
[0006] The leak detection process is divided into four steps: First step, with the first shut-off valve (8) and the fourth shut-off valve (9) closed, open the third shut-off valve (12) and the second shut-off valve (14), supply low-pressure nitrogen to the booster pump (13) through the low-pressure nitrogen cylinder bank (11), and then charge high-pressure nitrogen into the high-pressure storage tank (10) to 35 MPa. Second step, keep the first shut-off valve (8), the fourth shut-off valve (9), the third shut-off valve (12) and the second shut-off valve (14) in the closed state, open the first shut-off valve (8), adjust the low-pressure outlet pressure of the pressure reducing valve (7) to 8 MPa, open the fifth shut-off valve (5), charge nitrogen into the stator until the pressure reaches 8 MPa, and then close the fifth shut-off valve (5). Third step, keep the sixth shut-off valve (3), the first shut-off valve (8), the third shut-off valve (12) and the second shut-off valve (14) in the closed state, open the fourth shut-off valve (9), adjust the low-pressure outlet pressure of the pressure reducing valve (7) to 19 MPa, open the fifth shut-off valve (5), charge nitrogen into the stator until the pressure reaches 18.9 MPa, and then close the fifth shut-off valve (5) to start pressure holding. During the process, monitor the pressure of the workpiece through the first pressure gauge (2) and judge whether there is leakage in the workpiece. Fourth step, after the pressure holding ends, open the sixth shut-off valve (3) to discharge the high-pressure nitrogen in the stator to the outside of the workshop at a certain flow rate.
[0007] Technical effects of the present utility model:
[0008] The internal space volume of the shielded motor stator is large (1000 L), and the gas pressure required for the leak detection test is high (18.9 MPa). The pressure in the purchased low-pressure nitrogen cylinders is about 14 MPa, which cannot meet the test requirements. It is necessary to boost the nitrogen pressure to 35 MPa and store it in the high-pressure storage tank. The remaining 8 MPa of nitrogen after the low-pressure nitrogen cylinder bank fills the stator can be pumped into the high-pressure storage tank through the booster pump, improving the utilization rate of nitrogen.
[0009] This set of high-pressure gas charging device is relatively simple in design, easy to maintain, and has a low cost, achieving good results in use. Description of the Drawings
[0010] Figure 1 Schematic diagram of the pipeline connection of the high-pressure gas charging device for the leak detection test of the shielded main pump motor stator of the present utility model Detailed Embodiment
[0011] As Figure 1As shown in the figure, a high-pressure gas charging device for shielding the stator leakage detection test of a main pump motor is composed of a low-pressure nitrogen cylinder group 11, a high-pressure nitrogen storage tank 10, a pressure reducing valve 7, and a booster pump 13. The low-pressure nitrogen cylinder group 11 is connected in series with a high-pressure gas source group 15. The high-pressure gas source group 15 is successively composed of a second stop valve 14, a booster pump 13, a third stop valve 12, a high-pressure nitrogen storage tank 10, and a fourth stop valve 9 connected in series. A first stop valve 8 is connected in parallel with the high-pressure gas source group 15 and then successively connected to a pressure reducing valve 7, a second pressure gauge 6, a fifth stop valve 5, and a first pressure gauge 2, and finally connected to the winding cavity of the stator 1. A pressure relief branch 16 is provided between the pipeline of the fifth stop valve 5 and the first pressure gauge 2. The open end of the pressure relief branch 16 leads to the external atmosphere. The pressure relief branch 16 is composed of a sixth stop valve 3 and an overpressure rupture disc 4 connected in parallel.
Claims
1. A high-pressure gas charging device for shielding the stator leakage detection test of a main pump motor, characterized in that: It consists of a low-pressure nitrogen cylinder bank (11), a high-pressure nitrogen storage tank (10), a pressure reducing valve (7), and a booster pump (13). The low-pressure nitrogen cylinder bank (11) is connected in series with a high-pressure gas source group (15). The high-pressure gas source group (15) is successively composed of a second stop valve (14), a booster pump (13), a third stop valve (12), a high-pressure nitrogen storage tank (10), and a fourth stop valve (9) connected in series. The first stop valve (8) is connected in parallel with the high-pressure gas source group (15) and then successively connected to a pressure reducing valve (7), a second pressure gauge (6), a fifth stop valve (5), and a first pressure gauge (2), and finally connected to the winding cavity of the stator (1). A pressure relief branch (16) is provided between the pipeline of the fifth stop valve (5) and the first pressure gauge (2). The open end of the pressure relief branch (16) leads to the external atmosphere. The pressure relief branch (16) is composed of a sixth stop valve (3) and an overpressure rupture disk (4) connected in parallel.