Hydrostatic test device

Abstract

The invention belongs to the technical field of test devices, and particularly relates to a water pressure test device. Comprising a liquid storage tank, a test body, an air compressor and a pressurizing device, the pressurizing device comprises a first liquid level switch, a second liquid level switch, a liquid discharge pump, a pressurizing pump and a mechanical pressure release valve, the first liquid level switch and the second liquid level switch are both installed on the liquid storage tank, the test body is connected with the liquid storage tank through two pipelines, the pressurizing pump is installed on the first pipeline, and the mechanical pressure release valve is installed on the second pipeline. Branch pipes are connected between the two pipelines and the liquid storage tank, a liquid discharge pump is installed on the first branch pipe, a mechanical pressure release valve is installed on the second branch pipe, the air compressor is connected with the second pipeline, and an air-drying air inlet valve and an air-drying air outlet valve are installed on the air compressor. Practical training operation is carried out by maintenance personnel, whether installation is correct or not and whether leakage occurs or not are verified, and safety is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of test devices, and particularly relates to a hydrostatic test device. Background Art

[0002] The function of the mechanical seal of the thermocouple in the nuclear reactor pressure vessel is to seal the thermocouple bundle tube and the pressure vessel top cover. It is one of the weakest links in the primary loop pressure boundary. During the operation of the unit, it bears the effects of high temperature, high pressure, and water flow impact of the primary loop boric acid water. Once the pressure boundary leaks, it will directly lead to irreversible serious consequences such as shutdown, reactor trip, and state withdrawal. Therefore, the safety test of the sealing device is particularly important. Install the thermocouple sealing device to simulate the on-site working conditions. After installation, conduct a hydrostatic test on the sealing device to test and evaluate the installation sealing effect. The process of the hydrostatic test generally includes: installing the sealing device, inflating and draining water, boosting pressure and maintaining pressure, and relieving pressure and draining water; among them, the pressure test of the pressure vessel is generally carried out with water as the medium. When the pressure vessel is subjected to a hydrostatic test, first, the vessel to be pressurized needs to be filled with water and air discharged to fill the inner cavity of the vessel to be pressurized with water, and then the pressure is increased to the test pressure through a pressure pump. During the water injection process, it is necessary to ensure that the gas in the vessel can be fully discharged. Otherwise, the air remaining in the equipment will accumulate in the vessel, resulting in the inability to fill the vessel with water; and the remaining gas in the vessel will also cause the pressure indication to be unstable during pressurization, the pressurization time to become longer, etc., affecting the result of the hydrostatic test of the vessel. Summary of the Invention

[0003] The purpose of the present invention is to provide a hydrostatic test device for maintenance personnel to carry out practical training operations, verify whether the installation is correct, whether there is leakage, and ensure safety.

[0004] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0005] A hydrostatic test device includes a liquid storage tank, a test body, an air compressor, and a pressurizing device. The pressurizing device includes a first liquid level switch, a second liquid level switch, a liquid discharge pump, a pressurizing pump, and a mechanical pressure relief valve. The first liquid level switch and the second liquid level switch are both installed on the liquid storage tank. The test body is connected to the liquid storage tank through two pipelines. Among them, a pressurizing pump is installed on the first pipeline. Branch pipes are connected between the two pipelines and the liquid storage tank. Among them, a liquid discharge pump is installed on the first branch pipe, and a mechanical pressure relief valve is installed on the second branch pipe. The air compressor is connected to the second pipeline, and an air drying inlet valve and an air drying outlet valve are installed on the air compressor.

[0006] It also includes an electric control cabinet, which includes a contactor, a main circuit breaker, and a PLC controller. The signal input terminal and signal output terminal of the PLC controller are connected to the contactor, and the main circuit breaker is respectively connected to the PLC controller and the contactor; the first liquid level switch, the second liquid level switch, the pressure pump, the liquid discharge pump, and the air compressor are all electrically connected to the contactor.

[0007] The PLC controller is externally connected to an operation screen.

[0008] The main circuit breaker is powered by an externally provided power input.

[0009] A stop valve, a first electric needle valve, and a first pressure sensor are installed on the first pipeline. The first electric needle valve and the first pressure sensor are located between the pressure pump and the test body, and the stop valve is located between the pressure pump and the liquid storage tank; the first pressure sensor and the first electric needle valve are both electrically connected to the contactor.

[0010] A second electric needle valve b is also installed on the first pipeline, and the second electric needle valve b is connected to the liquid storage tank; the second electric needle valve b is electrically connected to the contactor.

[0011] A first flowmeter and a second electric needle valve a are also installed on the first branch pipeline. The first flowmeter is located between the liquid discharge pump and the liquid storage tank, and the second electric needle valve a is located between the liquid discharge pump and the test body; the first flowmeter and the second electric needle valve a are both electrically connected to the contactor.

[0012] A second flowmeter, a third electric needle valve, a fourth electric needle valve, a sixth electric needle valve, and a fifth pressure sensor are installed on the second pipeline in sequence from left to right. The sixth electric needle valve is connected to the air compressor, and a fourth pressure sensor is installed on the fourth electric needle valve; the second flowmeter, the sixth electric needle valve, the fourth pressure sensor, the fourth electric needle valve, the fifth pressure sensor, and the third electric needle valve are all electrically connected to the contactor.

[0013] A fifth electric needle valve and a second pressure sensor are connected to the test body, and a third pressure sensor is installed on the fifth electric needle valve; the second pressure sensor, the fifth electric needle valve, and the third pressure sensor are all electrically connected to the contactor.

[0014] A drain valve is installed on the liquid storage tank.

[0015] The beneficial effects obtained by the present invention are as follows:

[0016] 1. In this application, processes such as automatic water filling, air exhausting, pressure boosting, pressure maintaining, pressure reducing, and pressure relieving can be achieved; it supports dynamic flow block display, the operation status of the equipment is more obvious and vivid, water pressure test monitoring can be carried out, and other curves such as dynamic generation of water pressure curves can be performed.

[0017] 2. In this application, the historical alarm data of the device can be queried according to time, and the alarm information of the device and the alarm information released can be displayed. The setting is simple. You only need to add a function button and select the corresponding function item to complete the setting in one step. With built-in storage function, this machine can store historical alarm data and support U disk export;

[0018] 3. In this application, after the test is completed, click the pressure relief button on the control screen, the control system automatically controls the drainage pump to start, and opens the first electric needle valve to automatically discharge the water in the pipe system. During the operation, when there is water flowing in the pipe system, the control screen can dynamically display the direction of the water flow in the pipe in real time, which is more intuitive and safer;

[0019] 4. In this application, during the test, when the pressure does not meet the set value, it is necessary to perform a pressure replenishment operation. Click the pressure replenishment button on the control screen, the control system automatically starts the pressure pump, and opens the third electric needle valve to perform the pressure replenishment operation;

[0020] 5. In this application, the liquid storage tank is semi-closed to prevent solution evaporation and air dust pollution; due to the high pressure, all internal sensors are high-pressure resistant, and the circulation pipeline uses stainless steel 304 hard pipe;

[0021] 6. In this application, the entire device is formed by sheet metal bending and welding, and the internal skeleton is reinforced; a mechanical pressure relief valve is installed inside the device to reduce safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 Shown is a schematic structural diagram of a water pressure test device provided by the present invention;

[0023] Figure 2 Shown is a schematic structural diagram of a pressurizing device;

[0024] Figure 3 Shown is a schematic diagram of the structure of the compressed air system.

[0025] 11-first liquid level switch; 12-second liquid level switch; 13-boosting pump; 14-drain valve; 15-drain pump; 16-first flow meter; 17-second flow meter; 18-stop valve; 19-PLC controller; 20-main circuit breaker; 21-contactor; 22-power supply; 23-air compressor; 24-sixth electric needle valve; 25-fourth pressure sensor; 26-fourth electric needle valve; 27-second pressure sensor; 28-fifth electric needle valve; 29-third pressure sensor; 30-fifth pressure sensor; 31-second electric needle valve a; 32-first pressure sensor; 33-first electric needle valve; 34-second electric needle valve b; 35-third electric needle valve; 36-mechanical pressure relief valve; 37-control screen. DETAILED DESCRIPTION

[0026] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0027] A hydrostatic test device includes a liquid storage tank, a test body, an electric control cabinet, a compressed air system, and a pressurizing device. The pressurizing device includes a first liquid level switch, a second liquid level switch, a liquid discharge pump, a pressurizing pump, a mechanical pressure relief valve, and pipelines. The first liquid level switch and the second liquid level switch are both installed on the liquid storage tank. The test body is connected to the liquid storage tank through two pipelines. A pressurizing pump is installed on the first pipeline. Branch pipelines are connected between the two pipelines and the liquid storage tank. A liquid discharge pump is installed on the first branch pipeline, and a mechanical pressure relief valve is installed on the second branch pipeline. The compressed air system is an air compressor. The air compressor is connected to the second pipeline, and an air drying inlet valve and an air drying outlet valve are installed on the air compressor. Each electrical component is electrically connected to the electric control cabinet.

[0028] Preferably, the electric control cabinet includes a control mechanism, a main circuit breaker, and a PLC controller. The signal input end and the signal output end of the PLC controller are connected to the control mechanism. The main circuit breaker is respectively connected to the PLC controller and the control mechanism. Each electrical component is electrically connected to the control mechanism.

[0029] Preferably, the PLC controller is externally connected to a control screen, and the main circuit breaker is powered by an externally provided power input.

[0030] Preferably, a stop valve, a first electric needle valve, and a first pressure sensor are installed on the first pipeline. The first electric needle valve and the first pressure sensor are located between the pressurizing pump and the test body, and the stop valve is located between the pressurizing pump and the liquid storage tank.

[0031] Preferably, a second electric needle valve b is also installed on the first pipeline. The second electric needle valve b is connected to the liquid storage tank.

[0032] Preferably, a first flow meter and a second electric needle valve a are also installed on the first branch pipeline. The first flow meter is located between the liquid discharge pump and the liquid storage tank, and the second electric needle valve a is located between the liquid discharge pump and the test body.

[0033] Preferably, a second flow meter, a third electric needle valve, a fourth electric needle valve, a sixth electric needle valve, and a fifth pressure sensor are installed on the second pipeline from left to right. The sixth electric needle valve is connected to the air compressor, and a fourth pressure sensor is installed on the fourth electric needle valve.

[0034] Preferably, a fifth electric needle valve and a second pressure sensor are connected to the test body, and a third pressure sensor is installed on the fifth electric needle valve.

[0035] Preferably, a drain valve is installed on the liquid storage tank.

[0036] Preferably, the control mechanism is a contactor, and the first liquid level switch, the second liquid level switch, the pressure pump, the liquid discharge pump, the first flowmeter, the second flowmeter, the air compressor, the sixth electric needle valve, the fourth pressure sensor, the fourth electric needle valve, the second pressure sensor, the fifth electric needle valve, the third pressure sensor, the fifth pressure sensor, the second electric needle valve a, the first pressure sensor, the first electric needle valve, the second electric needle valve b, and the third electric needle valve are all electrically connected to the contactor.

[0037] Please refer to Figures 1-3 , the present invention provides the following embodiments:

[0038] A hydrostatic test device, comprising a liquid storage tank, a test body, an electric control cabinet, a compressed air system, and a pressurizing device. The pressurizing device includes a first liquid level switch 11, a second liquid level switch 12, a liquid discharge pump 15, a pressure pump 13, a mechanical pressure relief valve 36, and pipelines. The first liquid level switch 11 and the second liquid level switch 12 are both installed on the liquid storage tank. The test body is connected to the liquid storage tank through two pipelines. Among them, a pressure pump 13 is installed on the first pipeline. Branch pipelines are connected between the two pipelines and the liquid storage tank. Among them, a liquid discharge pump 15 is installed on the first branch pipeline, and a mechanical pressure relief valve 36 is installed on the second branch pipeline. The compressed air system is an air compressor 23. The air compressor 23 is connected to the second pipeline, and an air drying inlet valve and an air drying outlet valve are installed on the air compressor 23. Each electrical component is electrically connected to the electric control cabinet.

[0039] Specifically, the electric control cabinet includes a control mechanism, a main circuit breaker 20, and a PLC controller 19. The signal input end and the signal output end of the PLC controller 19 are connected to the control mechanism. The main circuit breaker 20 is respectively connected to the PLC controller 19 and the control mechanism. Each electrical component is electrically connected to the control mechanism.

[0040] Specifically, the PLC controller 19 is externally connected to an operation screen 37, and the main circuit breaker 20 is powered by an externally provided power supply 22.

[0041] Specifically, a stop valve 18, a first electric needle valve 33, and a first pressure sensor 32 are installed on the first pipeline. Among them, the first electric needle valve 33 and the first pressure sensor 32 are located between the pressure pump 13 and the test body, and the stop valve 18 is located between the pressure pump 13 and the liquid storage tank.

[0042] Specifically, a second electric needle valve b34 is also installed on the first pipeline, and the second electric needle valve b34 is connected to the liquid storage tank.

[0043] Specifically, a first flowmeter 16 and a second electric needle valve a31 are also installed on the first branch pipe. The first flowmeter 16 is located between the liquid discharge pump 15 and the liquid storage tank, and the second electric needle valve a31 is located between the liquid discharge pump 15 and the test body.

[0044] Specifically, a second flowmeter 17, a third electric needle valve 35, a fourth electric needle valve 26, a sixth electric needle valve 24, and a fifth pressure sensor 30 are sequentially installed on the second pipeline from left to right. Among them, the sixth electric needle valve 24 is connected to the air compressor 23, and a fourth pressure sensor 25 is installed on the fourth electric needle valve 26.

[0045] Specifically, a fifth electric needle valve 28 and a second pressure sensor 27 are connected to the test body, and a third pressure sensor 29 is installed on the fifth electric needle valve 28.

[0046] Specifically, a drain valve 14 is installed on the liquid storage tank.

[0047] Specifically, the control mechanism is a contactor 21. The first liquid level switch 11, the second liquid level switch 12, the pressure pump 13, the liquid discharge pump 15, the first flowmeter 16, the second flowmeter 17, the air compressor 23, the sixth electric needle valve 24, the fourth pressure sensor 25, the fourth electric needle valve 26, the second pressure sensor 27, the fifth electric needle valve 28, the third pressure sensor 29, the fifth pressure sensor 30, the second electric needle valve a31, the first pressure sensor 32, the first electric needle valve 33, the second electric needle valve b34, and the third electric needle valve 35 are all electrically connected to the contactor 21.

[0048] Specifically, the liquid storage tank is semi-closed to prevent solution evaporation and air dust pollution; due to the high pressure, all internal sensors adopt high-pressure resistant types, and the circulation pipeline adopts stainless steel 304 hard pipes; the overall device is formed by sheet metal bending and welding, with an internal skeleton reinforcement design; a mechanical pressure relief valve is installed inside the device to reduce potential safety hazards.

[0049] The specific implementation method of this embodiment is as follows: After the external pipeline connection is completed and the liquid storage tank solution is replenished, the system conducts self-checks to detect various sensors and electrical components. When there is no fault, set the pressure value that needs to be maintained on the control screen 37 and click the "maintain pressure" button to automatically start the exhaust and pressure maintenance work.

[0050] After receiving the instruction, the system performs exhaust and pressure holding operations. It closes the first electric needle valve 33, opens the second electric needle valve, the third electric needle valve 35, and the fourth electric needle valve 26 to start exhausting. After the second flowmeter 17 detects the water flow, the system determines that the exhaust is completed, closes the fourth electric needle valve 26, and starts pressurizing. By means of stagewise PID control, the closing of the third electric needle valve 35 is adjusted to ensure a stable pressure rising rate. The pressure is judged whether it reaches the set value by detecting the values of the second pressure sensor 27 and the fourth pressure sensor 25 or the values of the third pressure sensor 29 and the fifth pressure sensor 30 (the second pressure sensor 27 and the fourth pressure sensor 25 are high-pressure detection sensors with a range of 25 mpa, the third pressure sensor 29 and the fifth pressure sensor 30 are medium-pressure sensors with a range of 6 mpa, where the first pressure sensor 32 and the third pressure sensor 29 are main sensors, and the fourth pressure sensor 25 and the fifth pressure sensor 30 are auxiliary sensors for correction and deviation judgment). After the pressure reaches the required pressure, the second electric needle valve is closed for pressure holding timing (the pressure holding duration is displayed in real time on the control screen 37, and a sound and light prompt is given after the duration reaches 30 minutes). At the same time, the third electric needle valve 35 is slowly opened to relieve pressure and the pressure pump 13 is closed;

[0051] If a pressure replenishment operation is required during the pressure holding process, click the "Pressure Replenishment" operation on the control screen 37. After receiving the instruction, the system performs the pressure replenishment operation, opens the third electric needle valve 35 and starts the pressure pump 13, then slowly closes the third electric needle valve 35 until the pressure detected by the first pressure sensor 32 is close to the pressure inside the system, and then opens the second electric needle valve for pressure replenishment. After replenishing to the set pressure, the second electric needle valve is closed and the pressure holding timing is restarted (the pressure holding duration is displayed in real time on the control screen 37, and a sound and light prompt is given after the duration reaches 30 minutes). At the same time, the third electric needle valve 35 is slowly opened to relieve pressure and the pressure pump 13 is closed;

[0052] After the test is completed, click the "Pressure Relief" button on the control screen 37. After receiving the instruction, the fourth electric needle valve 26 is slowly opened for pressure relief. After the pressure relief is completed, the fourth electric needle valve 26 remains open. The first electric needle valve 33 is opened and the drain pump 15 is started for liquid drainage. It is judged whether the solution in the container is drained completely by detecting through the first flowmeter 16. After the drainage is completed, the drain pump 15 is closed and wait for air drying;

[0053] After the pressure relief is completed, the air compressor 23 is started and the sixth electric needle valve 24 is opened for air drying. After the air drying is completed, all electric needle valves are closed and the drain pump 15 is closed to prepare for the next stage of the test.

[0054] It should be noted that the device has intelligent automatic operation, fault self-diagnosis and emergency capabilities, and can achieve unattended operation;

[0055] The control adopts intelligent group control, and the device takes measures of self-diagnosis of faults and early warning protection of faults to improve the safety of the device;

[0056] Operating mode of the device

[0057] a. After the device is powered on, through the inspection of a series of sensors, all parts of the device indicate normal, and the device enters the ready state. At this time, the device can be directly started;

[0058] b. Pressurization mode: After receiving the pressurization instruction, the device enters the full-automatic operation state according to the built-in control strategy, automatically exhausts and detects whether the exhaust is completed. After the exhaust is completed, pressurization is carried out, and the pressure is increased to the set value range of ±0.5 mpa. After the device pressurization is completed, it enters the automatic pressure-holding mode;

[0059] c. Pressure compensation mode: During the pressure-holding process, the pressure compensation operation can be carried out through the manual button;

[0060] d. Drainage mode: After the test of the test body is completed, the pressurization mode is manually turned off, and the drainage mode is manually turned on. In the drainage mode, the pressure is automatically and slowly relieved. After the pressure relief is completed, the solution in the test body is automatically evacuated by the drainage pump. After the drainage is completed, automatic air blowing and drying are carried out. After the drying is completed, the drainage switch is reset.

Claims

1. A hydrostatic test device, characterized in that: It includes a liquid storage tank, a test body, an air compressor, and a pressurizing device. The pressurizing device includes a first liquid level switch, a second liquid level switch, a drain pump, a pressurizing pump, and a mechanical pressure relief valve. The first liquid level switch and the second liquid level switch are both installed on the liquid storage tank. The test body is connected to the liquid storage tank through two pipelines. Among them, a pressurizing pump is installed on the first pipeline. Branch pipes are connected between the two pipelines and the liquid storage tank. Among them, a drain pump is installed on the first branch pipe, and a mechanical pressure relief valve is installed on the second branch pipe. The air compressor is connected to the second pipeline, and an air drying inlet valve and an air drying outlet valve are installed on the air compressor.

2. The hydrostatic test device according to claim 1, wherein: It further includes an electric control cabinet. The electric control cabinet includes a contactor, a main circuit breaker, and a PLC controller. The signal input terminal and the signal output terminal of the PLC controller are connected to the contactor. The main circuit breaker is respectively connected to the PLC controller and the contactor; the first liquid level switch, the second liquid level switch, the pressurizing pump, the drain pump, and the air compressor are all electrically connected to the contactor.

3. The hydrostatic test device according to claim 2, wherein: The PLC controller is externally connected to a control screen.

4. The hydrostatic test device according to claim 2, characterized in that: The main circuit breaker is powered by an externally provided power input.

5. The hydrostatic test device according to claim 2, characterized in that: A stop valve, a first electric needle valve, and a first pressure sensor are installed on the first pipeline. Among them, the first electric needle valve and the first pressure sensor are located between the pressurizing pump and the test body, and the stop valve is located between the pressurizing pump and the liquid storage tank; the first pressure sensor and the first electric needle valve are both electrically connected to the contactor.

6. The hydrostatic test device according to claim 2, characterized in that: A second electric needle valve b is also installed on the first pipeline. The second electric needle valve b is connected to the liquid storage tank; the second electric needle valve b is electrically connected to the contactor.

7. The hydrostatic test device according to claim 2, wherein: A first flowmeter and a second electric needle valve a are also installed on the first branch pipe. The first flowmeter is located between the drain pump and the liquid storage tank, and the second electric needle valve a is located between the drain pump and the test body; the first flowmeter and the second electric needle valve a are both electrically connected to the contactor.

8. The hydrostatic test device according to claim 2, characterized in that: A second flowmeter, a third electric needle valve, a fourth electric needle valve, a sixth electric needle valve, and a fifth pressure sensor are installed on the second pipeline from left to right. Among them, the sixth electric needle valve is connected to the air compressor, and a fourth pressure sensor is installed on the fourth electric needle valve; the second flowmeter, the sixth electric needle valve, the fourth pressure sensor, the fourth electric needle valve, the fifth pressure sensor, and the third electric needle valve are all electrically connected to the contactor.

9. The hydrostatic test device according to claim 2, characterized in that: A fifth electric needle valve and a second pressure sensor are connected to the test body, and a third pressure sensor is installed on the fifth electric needle valve; the second pressure sensor, the fifth electric needle valve, and the third pressure sensor are all electrically connected to the contactor.

10. The hydrostatic test device according to claim 1, characterized in that: A drain valve is installed on the liquid storage tank.

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