Detection device

Abstract

The present invention discloses a detection device, which relates to the field of detection. The main purpose is to provide a pressure relay with a steadily increasing air pressure, and then accurately read the starting pressure value of the pressure relay when the pressure relay is triggered, and correctly judge the state of the pressure relay. The main technical scheme of the present invention is: a detection device, which includes: a buffer tank, which is provided with an air inlet, an air outlet and a pressure gauge; the air inlet is used to inject high-pressure gas into the buffer tank, the air outlet is used to connect the pressure relay to be tested, and the pressure gauge is provided at the air outlet to detect the air pressure value at the air outlet. The present invention is mainly used to detect the starting pressure of the pressure relay.

Description

Technical Field

[0001] The present invention relates to the field of detection, and in particular to a detection device. Background Art

[0002] When inspecting the converter transformer, the core equipment of the converter station, a special inspection item is the detection of the on-load tap changer pressure relay. The pressure relay is a device that protects the on-load tap changer. It is installed on the oil chamber of the on-load tap changer. When the pressure in the oil chamber of the on-load tap changer is too high, the pressure relay is triggered to disconnect the main circuit breaker of the converter transformer. By performing pressure detection on the pressure relay, ensuring that the pressure relay operates at the specified pressure value is an important part of the on-load tap changer pressure relay detection.

[0003] The current pressure relay detection method is to connect the air pump to the pressure relay, set a pointer pressure gauge at the connection, and use the air pump to output air pressure to the pressure input end of the pressure relay. When a certain pressure is reached, the pressure relay is triggered, and the value displayed on the pressure gauge is read. The reading is compared with the standard starting pressure value of the pressure relay to determine whether the pressure relay is in a normal state. However, the air pump is directly connected to the pressure relay, and each time the air pump is pumped, the air flow at the connection will be unstable, causing the pressure gauge pointer to fluctuate over a large range, making it impossible to accurately read the exact pressure value when the pressure relay is actuated, thereby affecting the judgment of the pressure relay state. Summary of the invention

[0004] In view of this, an embodiment of the present invention provides a detection device, the main purpose of which is to provide a steadily increasing air pressure to the pressure relay, and then accurately read the starting pressure value of the pressure relay when the pressure relay is triggered, and correctly judge the state of the pressure relay.

[0005] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0006] An embodiment of the present invention provides a detection device, which includes:

[0007] A buffer tank, which is provided with an air inlet, an air outlet and a pressure gauge;

[0008] The air inlet is used to inject high-pressure gas into the buffer tank, the air outlet is used to connect the pressure relay to be tested, and the pressure gauge is set at the air outlet to detect the air pressure value at the air outlet;

[0009] An air guide pipe, wherein the first end of the air guide pipe is connected to the air outlet, the second end of the air guide pipe is connected to the first end of the three-way joint, the second end of the three-way joint is connected to the pressure relay to be tested, the third end of the three-way joint is connected to the pressure gauge, and a control valve is connected between the second end of the three-way joint and the pressure relay to be tested, and the control valve is used to control the on-off of the second end of the three-way joint. Optionally, the air inlet and the air outlet are respectively arranged at the two ends of the buffer tank.

[0010] Optionally, the airflow direction of the air inlet is perpendicular to the airflow direction of the air outlet.

[0011] Optionally, the buffer tank includes a cylindrical side wall and a hemispherical head connected to the edges of both ends of the cylindrical side wall, the air inlet is arranged on the hemispherical head at one end of the buffer tank, and the air outlet is arranged on the cylindrical side wall at the other end of the buffer tank. Optionally, the air inlet is a self-sealing air nozzle.

[0012] Optionally, the pressure gauge is a digital barometer.

[0013] Optionally, the buffer tank is also provided with an exhaust port for exhausting excess gas in the buffer tank.

[0014] A detection device proposed in an embodiment of the present invention has the main purpose of providing a pressure relay with a steadily increasing air pressure, and then accurately reading the starting pressure value of the pressure relay when the pressure relay is triggered, and correctly judging the state of the pressure relay. In the prior art, an air pump is connected to the pressure relay to output air pressure to the pressure relay, and a pointer pressure gauge is provided at the connection. Each time the air pump is pumped, the air flow at the connection is unstable, causing the pressure gauge pointer to fluctuate widely. When the pressure relay is triggered, the exact air pressure at the time of the pressure relay action cannot be accurately read, thereby affecting the judgment of the state of the pressure relay. Compared with the prior art, The detection device in the present application document is provided with a buffer tank. During the pressure relay detection process, air is pumped into the buffer tank from the air inlet of the buffer tank. After the gas is buffered in the buffer tank and becomes a stable airflow, a steadily increasing air pressure is provided to the pressure relay through the air outlet of the buffer tank. The pressure gauge reads the air pressure value at the air outlet of the buffer tank. Since the air pressure at the air outlet of the buffer tank increases steadily, the pressure gauge reads accurately when the pressure relay is triggered, thereby avoiding the problem of being unable to accurately judge the starting pressure of the pressure relay due to unstable airflow when the air pump is directly connected to the pressure relay. This ensures the accuracy of the pressure relay detection and the stable operation of the converter transformer. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram of the structure of a detection device provided by an embodiment of the present invention;

[0016] Figure 2A schematic structural diagram of a buffer tank in a detection device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0017] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0018] like Figure 1 As shown, an embodiment of the present invention provides a detection device, which includes:

[0019] A buffer tank 1, wherein the buffer tank 1 is provided with an air inlet 2, an air outlet 3 and a pressure gauge 4;

[0020] The air inlet 2 is used to inject high-pressure gas into the buffer tank 1 , the air outlet 3 is used to connect the pressure relay to be tested, and the pressure gauge 4 is arranged at the air outlet 3 to detect the air pressure value at the air outlet 3 .

[0021] Among them, the buffer tank 1 is used to buffer the incoming air. The buffer tank 1 can be a micro tank. Since the gas storage space of the micro tank is relatively small, the air pressure at the outlet 3 can quickly reach the starting pressure of the pressure relay, shortening the time period of the pressure relay detection. In addition, the pressure relay is usually located at a higher position from the ground. The micro tank is light in weight and easy to carry and operate. The air inlet 2 on the buffer tank 1 can be connected to a variety of gas output devices, such as an air pump, an air pump, etc. The air inlet 2 fits tightly with the gas outlet of the gas output device. The gas output device pumps air into the buffer tank 1 through the air inlet 2. After the gas enters the buffer tank 1, it is buffered inside the buffer tank 1, so that the air pressure at the air outlet 3 of the buffer tank 1 slowly increases. The air outlet 3 is connected to the pressure input port of the pressure relay to provide the pressure relay with slowly increasing air pressure. At the same time, a pressure gauge 4 is provided at the air outlet 3 to detect the air pressure value received by the pressure relay. When the air pressure at the air outlet 3 reaches a certain value, the pressure relay is triggered. At this time, the data of the pressure gauge 4 is read and compared with the standard pressure relay action pressure value to determine whether the pressure relay is in a normal state. Since the air pressure at the air outlet 3 increases steadily without a large fluctuation in the air flow, the data of the pressure gauge 4 can be read accurately.

[0022] Specifically, the pressure relay is connected to a judgment device, the judgment device is connected to the input end of the controller, and the output end of the trigger action is connected to the gas output device. The judgment device detects in real time whether the pressure relay is triggered. When the pressure relay reaches a certain air pressure to trigger the action, the judgment device sends a pause signal to the controller. The controller controls the gas output device to stop inputting gas into the buffer tank 1 according to the signal sent by the judgment device, so that the pressure value in the buffer tank 1 remains unchanged at the pressure value at the time of the pressure relay action, so that the staff can have sufficient time to read the pressure value, making the reading more accurate.

[0023] A detection device proposed in an embodiment of the present invention has the main purpose of providing a pressure relay with a steadily increasing air pressure, and then accurately reading the starting pressure value of the pressure relay when the pressure relay is triggered, and correctly judging the state of the pressure relay. In the prior art, an air pump is connected to the pressure relay to output air pressure to the pressure relay, and a pointer pressure gauge is provided at the connection. Each time the air pump is pumped, the air flow at the connection is unstable, causing the pressure gauge pointer to fluctuate widely. When the pressure relay is triggered, the exact air pressure at the time of the pressure relay action cannot be accurately read, thereby affecting the judgment of the state of the pressure relay. Compared with the prior art, The detection device in the present application document is provided with a buffer tank. During the pressure relay detection process, air is pumped into the buffer tank from the air inlet of the buffer tank. After the gas is buffered in the buffer tank and becomes a stable airflow, a steadily increasing air pressure is provided to the pressure relay through the air outlet of the buffer tank. The pressure gauge reads the air pressure value at the air outlet of the buffer tank. Since the air pressure at the air outlet of the buffer tank increases steadily, the pressure gauge reads accurately when the pressure relay is triggered, thereby avoiding the problem of being unable to accurately judge the starting air pressure of the pressure relay due to unstable airflow when the air pump is directly connected to the pressure relay. This ensures the accuracy of the pressure relay detection and the stable operation of the converter transformer.

[0024] Since pumping air into the buffer tank will cause the air flow at the air inlet 2 to fluctuate, the air inlet 2 and the air outlet 3 are arranged at relatively distant positions on the buffer tank 1. Specifically, they can be arranged at the two ends of the buffer tank 1 respectively. The gas output device generates a high-speed airflow that enters from the air inlet 2 at one end of the gas storage tank 1. The airflow speed decreases after being buffered by the stable gas in the buffer tank 1, and the gas volume in the buffer tank 1 increases, thereby increasing the air pressure at the air outlet 3 of the buffer tank 1. Since the air outlet 3 is far away from the air inlet 2, the air pressure at the air outlet 3 increases steadily and is not affected by the high-speed airflow at the air inlet 2, thereby avoiding the problem of air pressure fluctuation at the air outlet 3 caused by direct connection between the air outlet 3 and the air inlet 2.

[0025] Specifically, the airflow direction of the air inlet 2 is perpendicular to the airflow direction of the air outlet 3. Since the pressure relay is not easy to disassemble, it is necessary to install the detection equipment near the location of the pressure relay to detect the pressure relay. The pressure relay is usually set at a higher position, which requires the detection equipment to be small in size and light in weight. Therefore, the detection equipment uses a small buffer tank. Since the distance between the two ends of the small buffer tank is short, when the airflow enters from the air inlet 2 of the buffer tank 1, the buffer tank 1 cannot fully decelerate the high-speed airflow in time, which will cause the air pressure at the air outlet 3 to be affected and fluctuate. Therefore, the air inlet 2 is set perpendicular to the airflow direction of the air outlet 3. For example, the buffer tank 1 is a cylindrical buffer tank, the air inlet 2 is set on the circular surface of one end, and the air outlet 3 is set on the side wall of the other end. Even if the airflow is not fully decelerated in the buffer tank 1, it will be rapidly decelerated due to the contact with the circular surface of the other end of the cylindrical buffer tank, so that the gas pressure in the buffer tank is uniform and stable, so it will not cause fluctuations in the air pressure at the air outlet 3, so that when the buffer tank is small in size, it can also provide a stable and increased air pressure for the pressure relay.

[0026] The shape of the buffer tank 1 can be various. Specifically, the buffer tank 1 can be a cylindrical buffer tank, including a cylindrical side wall 11 and a hemispherical head 12 connected to the edges of both ends of the cylindrical side wall 11. The air inlet 2 is arranged on the hemispherical head 12 at one end of the buffer tank 1, and the air outlet 3 is arranged on the cylindrical side wall 11 at the other end of the buffer tank 1. Since the starting pressure of the pressure relay may be very large, the buffer tank 1 is required to have a certain pressure bearing capacity. The hemispherical head 11 makes the head strength equal to that of the tank body. Among them, the cylindrical side wall 11 and the hemispherical head 12 are an integrally formed structure. On the one hand, the pressure bearing capacity of the buffer tank 1 is increased, and the occurrence of air leakage in the buffer tank 1 is avoided. On the other hand, the integrated hemispherical head 12 and the cylindrical side wall 11 make the interior of the entire buffer tank 1 smooth and without right angles, avoiding the generation of a small range of airflow self-circulation, and ensuring that the air pressure in the buffer tank 1 is quickly stabilized. Specifically, the buffer tank 1 is made of metal material to increase the strength of the buffer tank 1.

[0027] Furthermore, an air duct 5 is provided at the air outlet 3 of the buffer tank 1, the first end of the air duct 5 is connected to the air outlet 3, and the second end of the air duct 5 is connected to the pressure input end of the pressure relay to be tested. When gas is injected into the buffer tank 1, the air flow in the buffer tank 1 fluctuates, and the air pressure rises rapidly. Although there is no air flow fluctuation at the air outlet 3, the air pressure rises rapidly, so that the air pressure at the air outlet 3 rises in a step-like manner as the gas continues to enter, which can easily cause the pressure relay to malfunction. The air duct 5 is a metal round tube, and the cross-sectional diameter of the air duct 5 is smaller than the cross-sectional diameter of the buffer tank. Since the air duct 5 is thinner than the buffer tank 1, the gas in the buffer tank 1 slowly provides air pressure to the pressure relay through the air duct 5, so that the pressure input end of the pressure relay changes more slowly than the pressure change at the air outlet 3, which is conducive to the pressure gauge 4 to accurately display the pressure value and the accuracy of the triggering action of the pressure relay.

[0028] Furthermore, a three-way joint 6 is connected to the second end of the air duct 5, the first end of the three-way joint 6 is connected to the second end of the air duct 5, the second end of the three-way joint 6 is connected to the pressure input end of the pressure relay to be tested, and the third end of the three-way joint 6 is connected to the pressure gauge 4. Specifically, the first end of the three-way joint 6 and the third end of the three-way joint 6 are located in the same straight line, the second end of the three-way joint 6 is perpendicular to the first end of the three-way joint 6 and the third end of the three-way joint 6, the pressure gauge 4 can accurately detect the air pressure value of the pressure input end of the pressure relay to be tested through the three-way joint 6, and the three-way joint 6 is easy to disassemble, and the relative positions of the pressure gauge 4, the pressure relay to be tested and the buffer tank 1 can be flexibly changed according to the position of the pressure relay to be tested, thereby increasing the application range of the detection device.

[0029] Among them, a control valve 7 is connected between the second end of the three-way connector 6 and the pressure input end of the pressure relay to be tested, and the control valve 7 is used to control the on-off of the second end of the three-way connector. During the pressure relay detection process, close the control valve 7 to inflate the buffer tank 1, and observe the pressure gauge reading at the same time. When the air pressure is close to the starting pressure of the pressure relay, wait until the air pressure is stable, connect the detection device to the pressure relay, open the control valve 7 to continue to inflate the buffer tank 1, which can save detection time, and there is a large amount of gas in the buffer tank 1 before connecting to the pressure relay, so that the gas injected after connecting to the pressure relay can be better buffered. In addition, closing the control valve 7 makes the detection device a closed space, and inflating the buffer tank 1 through the air inlet 2 can be used to test the tightness of the detection device.

[0030] Optionally, the air inlet 3 is a self-sealing air nozzle, which automatically opens when air is inletted and automatically closes when the airflow is interrupted, so as to ensure the air intake efficiency of the buffer tank 1 and the consistency of the airflow direction of the air inlet 2, and avoid the backflow of the airflow at the air inlet 2. The air outlet 3 is connected to the pressure input end of the pressure relay by a quick connector 8. Specifically, one end of the control valve 7 is connected to the second end of the three-way connector 6, and the other end of the control valve 7 is connected to the quick connector 8. The quick connector 8 is provided with a sealing cap. When it is not connected to the pressure relay, the quick connector 8 is in a closed state. When the pressure relay needs to be connected, the sealing cap of the quick connector 8 is removed, and the quick connector 8 is connected to the pressure input end of the pressure relay. The assembly speed is fast and easy to operate.

[0031] An exhaust port is also provided on the buffer tank 1 to discharge excess gas in the gas tank. When the detection device detects different pressure relays, different air pressures need to be provided for the pressure relays. For example, if the starting pressure of the pressure relay is relatively high, after the detection is completed, the air pressure in the buffer tank 1 is relatively high and there is more gas. If the gas is released through the air outlet 3, the speed is slow and the efficiency is low. By setting the exhaust port, after a detection is completed, the excess gas can be quickly released through the exhaust port to improve the detection efficiency. At the same time, the same pressure relay usually needs to be repeatedly tested many times to ensure that the accurate starting pressure is read. After a detection is completed, the gas in the buffer tank 1 needs to be released to reduce the air pressure in the buffer tank 1 to below the starting pressure for another detection. By setting the exhaust port, there is no need to disassemble the detection device between multiple detections of the same pressure relay, which greatly increases the efficiency and convenience of the detection.

[0032] Specifically, the pressure gauge 4 is a digital barometer, which uses digital measurement technology to convert continuous air pressure signals into discontinuous, discrete air pressure values ​​and display them. In the prior art, a pointer-type barometer is used to measure the air pressure at the pressure input end of the pressure relay. It has a single function, low precision, and inconvenient reading. It often requires experienced personnel to read the readings, which increases labor costs and has low accuracy. A digital barometer is used instead of a pointer-type barometer. It has high precision, strong anti-interference ability, and is easy to read. It increases the accuracy of air pressure measurement and saves labor costs. Furthermore, a controller can be set to be connected to the digital barometer to automatically record the air pressure value detected by the digital barometer when the pressure relay is detected to trigger the action, thereby avoiding the time difference when manually reading the pressure gauge value.

[0033] Furthermore, the detection device is also provided with a bracket 9, which is used to make the detection device stand on a plane or be fixed on the edge of an operating table, so as to facilitate the use of the detection device.

[0034] Through the description of the above implementation methods, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general hardware, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which is stored in a readable storage medium, such as a computer floppy disk, hard disk or optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0035] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A detection device, characterized in that: include: A buffer tank, wherein the buffer tank is provided with an air inlet, an air outlet and a pressure gauge; The air inlet is used to inject high-pressure gas into the buffer tank, the air outlet is used to connect the pressure relay to be tested, and the pressure gauge is arranged at the air outlet to detect the air pressure value at the air outlet; An air duct, wherein the first end of the air duct is connected to the air outlet, the second end of the air duct is connected to the first end of the three-way joint, the second end of the three-way joint is connected to the pressure relay to be tested, the third end of the three-way joint is connected to the pressure gauge, a control valve is connected between the second end of the three-way joint and the pressure relay to be tested, the control valve is used to control the on-off of the second end of the three-way joint, and the cross-sectional diameter of the air duct is smaller than the cross-sectional diameter of the buffer tank; The pressure relay is connected with a judgment device, which is connected to the input end of the controller, and the output end of the trigger action is connected to the gas output device. The judgment device detects in real time whether the pressure relay is triggered. When the pressure relay reaches a certain air pressure and triggers the action, the judgment device sends a pause signal to the controller. The controller controls the gas output device to stop inputting gas into the buffer tank according to the signal sent by the judgment device, so that the pressure value in the buffer tank remains unchanged at the pressure value at the time when the pressure relay is actuated; The air inlet and the air outlet are respectively arranged at two ends of the buffer tank; The airflow direction of the air inlet is perpendicular to the airflow direction of the air outlet; The buffer tank comprises a cylindrical side wall and a hemispherical head connected to the edges of both ends of the cylindrical side wall, the air inlet is arranged on the hemispherical head at one end of the buffer tank, and the air outlet is arranged on the cylindrical side wall at the other end of the buffer tank; The air inlet is a self-sealing air nozzle; The buffer tank is a miniature storage tank; The air outlet is connected to the pressure input end of the pressure relay by a quick connector, one end of the control valve is connected to the second end of the three-way connector, and the other end of the control valve is connected to the quick connector. The quick connector is provided with a sealing cap. When it is not connected to the pressure relay, the quick connector is in a closed state. When the pressure relay needs to be connected, the sealing cap of the quick connector is removed and the quick connector is connected to the pressure input end of the pressure relay.

2. The detection device according to claim 1, characterized in that: The pressure gauge is a digital barometer.

3. The detection device according to claim 1, characterized in that: The buffer tank is also provided with an exhaust port for exhausting excess gas in the buffer tank.

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