Portable pressure interlocking test device

Abstract

The invention relates to the technical field of electric power detection, and discloses a portable pressure interlocking test device which comprises a connecting pipeline, one end of the bottom of the connecting pipeline is detachably connected with a first stop valve, the bottom of the first stop valve is detachably connected with a communicating pipeline, and the bottom of the communicating pipeline is in threaded connection with a first quick connector. One end of the top of the connecting pipeline is detachably connected with a second stop valve, the top of the second stop valve is detachably connected with a second quick connector, the top of the second quick connector is detachably connected with a to-be-tested pressure switch, and the end, away from the second stop valve, of the top of the connecting pipeline is detachably connected with a third stop valve. When the unit normally operates or starts debugging, the pressure switch is tested on line, whether the operating value of the pressure switch is consistent with the design value or not is determined, the problem of operating value deviation is found, equipment faults or unit damage caused by switch abnormity is avoided, verification can be completed without dismounting the switch, the important protection exit risk is reduced, and unit safety and stable operation are guaranteed.

Description

Technical Field

[0001] This invention relates to the field of power testing technology, specifically a portable pressure interlocking test device. Background Technology

[0002] To ensure the long-term stable operation of the generating unit, some equipment is designed with redundancy and backup. The alarm, interlock, and protection functions of these devices are implemented through pressure switches. However, during long-term operation, the operating environment or other factors can cause the pressure switch's operating value to deviate, affecting the normal operation of the equipment or system, and in severe cases, causing damage to the generating unit. A portable pressure interlock testing device is a pressure switch testing device that can test the pressure switch during normal operation or start-up and commissioning of the unit to ensure that the pressure switch's operating value is consistent with the design value, or to promptly send the pressure switch for inspection and calibration if a significant difference is found.

[0003] The portable pressure interlock testing devices in the existing technology cannot conduct online and accurate tests on the pressure switch during normal operation or start-up and commissioning of the unit. They can only observe the switch action status and cannot confirm whether the action value is consistent with the design value. It is difficult to detect the deviation of the pressure switch action value in time, which can easily lead to equipment failure or unit damage accidents. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a portable pressure interlock testing device, which solves the problem that existing portable pressure interlock testing devices are unable to detect pressure switch action value deviations in a timely manner, which can easily lead to equipment failures or unit damage accidents.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a portable pressure interlocking test device, comprising a connecting pipeline, a shut-off valve 1 detachably connected to one bottom end of the connecting pipeline, a connecting pipeline detachably connected to the bottom of the shut-off valve 1, a quick connector 1 threadedly connected to the bottom of the connecting pipeline, a shut-off valve 2 detachably connected to one top end of the connecting pipeline, a quick connector 2 detachably connected to the top of the shut-off valve 2, a pressure switch to be tested detachably connected to the top of the quick connector 2, a shut-off valve 3 detachably connected to the top of the connecting pipeline away from the shut-off valve 2, a quick connector 3 threadedly connected to the top of the shut-off valve 3, a standard pressure gauge threadedly connected to the top of the quick connector 3, and an unloading valve detachably connected to the bottom end of the connecting pipeline away from the shut-off valve 1.

[0006] Preferably, the connecting pipe is provided with a throttling orifice, the orifice having a diameter of 1.2 mm.

[0007] Preferably, the first shut-off valve and the connecting pipeline are fixedly connected by a compression fitting, and the first shut-off valve is a needle valve.

[0008] Preferably, quick connector one is a pressure gauge male connector, quick connector two is a pressure gauge female connector, and quick connector one and quick connector two are each equipped with at least two types of adapters.

[0009] Preferably, the measurement accuracy of the pressure gauge is not less than 0.4 grade, and the pressure gauge can be replaced according to the design pressure range of the pressure switch to be tested.

[0010] Preferably, the connecting pipe is made of stainless steel, and the inner wall of the connecting pipe is polished, with an inner wall roughness Ra≤0.8μm.

[0011] Preferably, the seals of the first, second and third stop valves are made of fluororubber, and the unloading valve is a manually adjustable structure.

[0012] Preferably, the interfaces of quick connector one, quick connector two and quick connector three are all provided with sealing gaskets, and the sealing gaskets are made of oil-resistant nitrile rubber material.

[0013] Preferably, the outer wall of the connecting pipe is wrapped with a heat-insulating layer to prevent scalding, and the heat-insulating layer is made of silicone rubber.

[0014] This invention provides a portable pressure interlocking testing device. It has the following advantages: 1. This invention can test the pressure switch online during normal operation or start-up and commissioning of the unit, accurately confirm whether its action value is consistent with the design value, promptly detect the deviation of the action value, avoid equipment failure or unit damage due to switch abnormality, and complete the verification without removing the switch, reduce the risk of important protection being deactivated, and ensure the safety and stable operation of the unit.

[0015] 2. This invention is equipped with multi-specification conversion connectors, which can be adapted to pressure switches and pressure sources of different specifications; standard pressure gauges can be replaced as needed, the operation process is clear, solving the pain point of traditional online testing being unable to determine the action value, providing an efficient solution for pressure switch calibration, and improving the convenience and adaptability of testing. Attached Figure Description

[0016] Figure 1 This is an overall structural diagram of the present invention.

[0017] The components are as follows: 1. Quick connector one; 2. Throttling orifice; 3. Shut-off valve one; 4. Connecting pipeline; 5. Shut-off valve two; 6. Quick connector two; 7. Shut-off valve three; 8. Unloading valve; 9. Standard pressure gauge; 10. Quick connector three; 11. Pressure switch to be tested; 12. Connecting pipeline. Detailed Implementation

[0018] The technical solutions in 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.

[0019] Please see the appendix Figure 1 This invention provides a portable pressure interlock testing device, including a connecting pipe 4. A shut-off valve 3 is detachably connected to one bottom end of the connecting pipe 4, used to cut off the pressure source. A connecting pipe 12 is detachably connected to the bottom of the shut-off valve 3, and a quick connector 1 is threadedly connected to the bottom of the connecting pipe 12. A shut-off valve 5 is detachably connected to one top end of the connecting pipe 4, used to cut off the pressure source of the pressure switch to be tested. A quick connector 6 is detachably connected to the top of the shut-off valve 5, used for... The pressure switch to be tested is connected. The top of the quick connector 2 6 is detachably connected to the pressure switch 11 to be tested. The top end of the connecting pipe 4 away from the shut-off valve 2 5 is detachably connected to the shut-off valve 3 7. The shut-off valve 3 7 cuts off the pressure source of the standard pressure gauge. The top of the shut-off valve 3 7 is threadedly connected to the quick connector 3 10. The top of the quick connector 3 10 is threadedly connected to the standard pressure gauge 9. The bottom end of the connecting pipe 4 away from the shut-off valve 1 3 is detachably connected to the unloading valve 8. The unloading valve 8 is used to release the pressure inside the device so that the pressure switch can operate normally.

[0020] The connecting pipe 12 has an internal throttling orifice 2 with a diameter of 1.2 mm. The purpose of the orifice 2 is to control the flow rate entering the device so that it does not affect the system pressure during testing. The shut-off valve 3 and the connecting pipe 12 are fixedly connected by a compression fitting. The shut-off valve 3 is a needle-type shut-off valve. The quick-connect coupling 1 is a male pressure gauge coupling, and the quick-connect coupling 6 is a female pressure gauge coupling. Both quick-connect couplings 1 and 6 are equipped with at least two types of adapters. The measuring accuracy of the standard pressure gauge 9 is not less than 0.4 grade. The standard pressure gauge 9 can... The pressure switch 11 can be replaced according to its design pressure range. The connecting pipe 4 is made of stainless steel and its inner wall is polished with a roughness Ra≤0.8μm. The seals of the first stop valve 3, the second stop valve 5 and the third stop valve 7 are made of fluororubber. The unloading valve 8 is a manually adjustable structure. The interfaces of the first quick connector 1, the second quick connector 6 and the third quick connector 10 are all equipped with sealing gaskets made of oil-resistant nitrile rubber. The outer wall of the connecting pipe 4 is wrapped with a heat-insulating layer made of silicone rubber. First, seal the quick connector 1 to the pressure source of the unit. Connect the device to the pressure switch 11 to be tested via quick connector 2 6, and install a standard pressure gauge 9 matching the system pressure on quick connector 3 10. Before use, completely close the unloading valve 8 to block the pressure relief channel. Then, fully open the stop valves 1 3, 2 5, and 3 7 to allow the pressure medium from the pressure source to enter the device through the throttle orifice 2. Observe the standard pressure gauge 9 at this time. After the pressure value it displays is completely consistent with the reading of the unit system pressure gauge, confirm that the device pressure transmission is normal and there is no leakage. Then, slowly open the unloading valve 8 to control the pressure inside the device to decrease slowly. The operator simultaneously observes the change in the reading of the standard pressure gauge 9 and the status of the pressure switch 11 to be tested. When the pressure switch 11 to be tested... When the pressure switch 11 activates, such as by issuing an alarm signal or triggering an interlock command, immediately record the pressure value displayed on the pressure gauge 9. This value is the actual activation value of the pressure switch. After recording the activation value, slowly close the unloading valve 8. The pressure inside the device gradually rises with the replenishment of the pressure source. When the activation signal of the pressure switch 11 under test is reset, record the reading of the pressure gauge 9 at this time as the retrace value of the pressure switch. After the test data acquisition is completed, first close the shut-off valve 3 and shut-off valve 5 to disconnect the pressure source from the switch under test. Then open the unloading valve 8 to completely release the residual pressure inside the device. After the pressure gauge 9 displays zero pressure, remove the test device and restore the pressure switch 11 under test to its original working state to complete the entire test process.

[0021] The practical value of this device was fully verified during the start-up and commissioning of the steam turbine. During the overall start-up of the steam turbine, after the turbine reached its constant speed, the pressure in the lubricating oil pump outlet header dropped from 0.51 MPa to 0.485 MPa. At this time, the low pressure switch (PS1303) in the lubricating oil pump outlet header activated, triggering the start-up of the standby AC oil pump. The lubricating oil pressure subsequently rose from 0.485 MPa to 0.52 MPa, but the activation signal of the pressure switch failed to automatically reset. The individual calibration report of the pressure switch (PS1303) showed that its activation value was 0.454 MPa and the return value was 0.503 MPa, which fully met the design and operational requirements. Based on the on-site fault phenomenon, the technicians determined that the activation value of the pressure switch may have drifted due to factors such as ambient temperature and medium erosion during operation, and the activation value needed to be accurately recalibrated. Before the test, the low pressure switch in the lubricating oil pump outlet header was fully retested using this device. The retest results are shown in the table below: Table 1: Lubricating Oil Pressure Switch Re-inspection Record.

[0022] Switch position Switch number Action value (MPa) Return value (MPa) Set value (MPa) Low pressure switch for machine lubricating oil pump outlet header PS1303 0.478 0.539 0.45 The pressure switch on the outlet header of the lubricating oil pump was found to be low upon retesting, and the value differed significantly from the calibration value, failing to meet operational requirements. The pressure switch was then recalibrated and recalibrated, and the recalibration results are shown in Table 2. Table 2: On-site calibration record of lubricating oil pressure switch.

[0023] Switch position Switch number Action value (MPa) Return value (MPa) Setting value (MPa) Low pressure switch for machine lubricating oil pump outlet header PS1303 0.454 0.503 0.45 After recalibrating the pressure switch on-site, the low oil pressure test of the unit's lubrication system was repeated. The test results were normal, and the unit's lubrication system was then put into operation with associated interlocks and protections.

[0024] To ensure the accuracy of the operating values ​​of other switches, the power plant required that important pressure switches in other systems also be retested. The data before and after the retest are shown in Table 3.

[0025] Table 3: Data before retesting of other switches. Upon inspection, the pressure switch for the jacking oil header was found to be significantly different from the deviation value due to low pressure. The same method was used to readjust the switch, and the results are shown in the table below: Table 4: Data after setting the top shaft oil pressure switch.

[0026] Switch position Switch number Action value (MPa) Return value (MPa) Setting value (MPa) PS-1311 Low jacking oil outlet pressure 10.128 10.680 10 In summary, the on-site fabrication of this device took one day, and the testing took a total of three hours. Compared to the longer time required for sending the switch for testing, the time savings are significant.

[0027] Compared with traditional pressure switches, this device can be reused after it is manufactured, and the economic benefits are very obvious as the number of pressure switches increases.

[0028] This device is suitable for testing pressure measuring points and switches that are inconvenient to remove during unit operation, and is of great significance to the safe and stable operation of the unit.

[0029] Working principle: First, connect the quick connector 1 to the pressure source in a sealed manner, and connect the quick connector 6 to the pressure switch 11 to be tested. Install a standard pressure gauge 9 with a range matching the system pressure on the quick connector 10. Before use, close the unloading valve 8 to block the pressure release channel. Then, open the shut-off valves 3, 5, and 7 to allow the pressure from the pressure source to enter the device and the pressure switch 11 to be tested sequentially through the connecting pipe 4. After confirming that the pressure transmission is accurate, the pressure value displayed on the standard pressure gauge 9 matches the reading of the system pressure gauge. Then, slowly open the unloading valve 8 to allow the pressure inside the device to drop steadily. At the same time, closely observe the changes in the reading of the standard pressure gauge 9 and the status of the pressure switch 11 to be tested. When the pressure switch 11 under test activates, the pressure value displayed on the standard pressure gauge 9 is immediately recorded as the activation value. Then, the unloading valve 8 is slowly closed to allow the pressure inside the device to gradually rise under the pressure source replenishment. When the pressure switch 11 under test returns to its initial state, the reading of the standard pressure gauge 9 is recorded as the return value. Finally, the shut-off valve 3 and shut-off valve 5 are closed to isolate the pressure source from the pressure switch 11 under test. The unloading valve 8 is then opened again to completely release the residual pressure inside the device until the reading of the standard pressure gauge 9 returns to zero. The test device is then removed and the pressure switch 11 under test is restored to its original working state. This completes the accurate verification of the pressure switch activation characteristics without affecting the normal operation of the unit.

[0030] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A portable pressure interlocking test device, comprising a connecting pipeline (4), characterized in that, The bottom end of the connecting pipe (4) is detachably connected to a stop valve (3), the bottom of the stop valve (3) is detachably connected to a connecting pipe (12), the bottom of the connecting pipe (12) is threadedly connected to a quick connector (1), the top end of the connecting pipe (4) is detachably connected to a stop valve (5), the top of the stop valve (5) is detachably connected to a quick connector (6), the top of the quick connector (6) is detachably connected to a pressure switch (11) to be tested, the top end of the connecting pipe (4) away from the stop valve (5) is detachably connected to a stop valve (7), the top of the stop valve (7) is threadedly connected to a quick connector (10), the top of the quick connector (10) is threadedly connected to a standard pressure gauge (9), and the bottom end of the connecting pipe (4) away from the stop valve (3) is detachably connected to an unloading valve (8).

2. The portable pressure interlocking testing device according to claim 1, characterized in that, The connecting pipe (12) is provided with a throttling orifice (2) with a diameter of 1.2 mm.

3. The portable pressure interlocking testing device according to claim 1, characterized in that, The shut-off valve (3) and the connecting pipeline (12) are fixedly connected by a ferrule, and the shut-off valve (3) is a needle valve.

4. The portable pressure interlocking testing device according to claim 1, characterized in that, The quick connector one (1) is a male pressure gauge connector, and the quick connector two (6) is a female pressure gauge connector. Both quick connector one (1) and quick connector two (6) are equipped with at least two types of conversion connectors.

5. A portable pressure interlocking testing device according to claim 1, characterized in that, The measurement accuracy of the standard pressure gauge (9) is not less than 0.4 grade, and the standard pressure gauge (9) can be replaced according to the design pressure range of the pressure switch (11) to be tested.

6. A portable pressure interlocking testing device according to claim 1, characterized in that, The connecting pipe (4) is made of stainless steel, and the inner wall of the connecting pipe (4) is polished, with an inner wall roughness Ra≤0.8μm.

7. A portable pressure interlocking testing device according to claim 1, characterized in that, The seals of the first (3), the second (5) and the third (7) stop valves are made of fluororubber, and the unloading valve (8) is a manually adjustable structure.

8. A portable pressure interlocking testing device according to claim 1, characterized in that, The quick connector one (1), quick connector two (6) and quick connector three (10) are all provided with sealing gaskets, which are made of oil-resistant nitrile rubber.

9. A portable pressure interlocking testing device according to claim 1, characterized in that, The outer wall of the connecting pipe (4) is wrapped with a heat-insulating layer, which is made of silicone rubber.

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