Internal air cooling device of high and low temperature test chamber

Abstract

The utility model relates to a kind of high-low temperature test box internal air cooling device inside high-low temperature test box, mechanical characteristic test bench, control mechanism, three-phase adjustable power supply, wherein, three-phase adjustable power supply is connected high-low temperature test box through control mechanism, high-low temperature test box is connected mechanical characteristic test bench;High-low temperature test box is equipped with the clamping tool for fixing the test product inside, and to the test product applies crosswind axial fan, for the feedback crosswind anemograph, for measuring the thermocouple of high-low temperature test box inner environment temperature, for measuring the displacement sensor of test product mechanical performance;Anemograph is arranged on the upper and lower sides of clamping tool, and thermocouple is arranged at clamping tool side.This high-low temperature test box internal air cooling device can be satisfied with the temperature measurement to test product, can also apply crosswind to test product and measure wind speed, while improving test effect, improve the operation reliability and result accuracy of test system.

Description

Technical Field

[0001] This utility model relates to the field of electrical performance testing, specifically to an internal air-cooling device for a high and low temperature test chamber. Background Technology

[0002] High and low temperature testing is a crucial test item in the performance inspection of high-voltage electrical appliances, and it is of great significance to the reliability and stability of electrical appliances during use. Currently, the high and low temperature testing equipment in electrical laboratories consists of a high and low temperature test chamber, a mechanical characteristic testing platform, test fixtures, and measuring sensors. During the test, parameters such as the mechanical characteristics of the tested product are measured. The new testing standard requires: For circuit breakers equipped with an oil tank heater to prevent gas liquefaction under low ambient temperature conditions, an average wind speed of 10 km / h (±20%) perpendicular to the longitudinal axis of the test specimen should be simulated; crosswinds should be applied according to the test procedure described in the standard; the test location should include at least 5 points along the longitudinal axis of the test specimen at a distance of 0.5 m (±0.1 m) from the outside of the specimen casing; the distance between each measurement point should be approximately 0.3 m; the number of measurement points should ensure that the measurement length extends at least 0.5 m beyond both ends of the test specimen; the deviation of the wind speed measured individually at each measurement point from the average wind speed value should not exceed ±50%; the ambient air temperature should be measured using thermocouples at half the height of the test specimen and 1 m away from the specimen. Although the high and low temperature test chambers currently in use can measure the temperature inside the test chamber, they do not meet the requirements for temperature measurement in the new regulations, and they cannot apply crosswinds and measure wind speed, making it difficult for the test process to meet the requirements of the new testing standards. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the defects of existing high and low temperature test chambers, which do not meet the new regulations for temperature measurement and cannot apply crosswinds to the test specimens while measuring the wind speed. This utility model provides an internal air-cooling device for high and low temperature test chambers, which can perform satisfactory temperature measurement on the test specimens and apply crosswinds to the test specimens while measuring the wind speed. This improves the test effect and enhances the operational reliability and accuracy of the test system.

[0004] The internal air-cooling device of this high and low temperature test chamber includes a high and low temperature test chamber, a mechanical property testing platform, a central control mechanism, and a three-phase adjustable power supply. The three-phase adjustable power supply is connected to the high and low temperature test chamber via the central control mechanism, and the high and low temperature test chamber is connected to the mechanical property testing platform. The high and low temperature test chamber is equipped with a clamping fixture for fixing the test specimen, an axial flow fan for applying crosswind to the test specimen, an anemometer for feedback of crosswind speed, a thermocouple for measuring the ambient temperature inside the high and low temperature test chamber, and a displacement sensor for measuring the mechanical properties of the test specimen. The anemometer is arranged on the upper and lower sides of the clamping fixture, and the thermocouple is arranged on one side of the clamping fixture.

[0005] Furthermore, the centralized control mechanism includes a PLC controller and control terminal connected via wired / wireless communication, as well as a frequency converter.

[0006] Furthermore, the output terminals of the anemometer and the thermocouple are respectively connected to the feedback signal input terminal of the PLC controller.

[0007] Furthermore, the output terminal of the displacement sensor is connected to the detection signal input terminal of the mechanical characteristic test bench.

[0008] Furthermore, one of the three-phase adjustable power supplies is connected to the test sample, another is connected to the high and low temperature test chamber via a PLC controller, and the third is connected to the axial flow fan via a PLC controller and frequency converter.

[0009] Specifically, at least three anemometers are installed on the top and bottom of the clamping fixture, and the thermocouples are installed on one side of the clamping fixture; the innermost anemometer is installed 0.5m away from the clamping fixture, the distance between adjacent anemometers is 0.3m, and the innermost anemometer is 0.5m away from the clamping fixture; the thermocouples are installed 1m horizontally away from the clamping fixture and are located slightly above the plane of the clamping fixture.

[0010] This utility model discloses an internal air-cooling device for a high and low temperature test chamber, which overcomes the shortcomings of existing high and low temperature test chambers, such as temperature measurement not conforming to the new regulations and inability to apply crosswinds to the test specimens while simultaneously measuring wind speed. Its beneficial effects are: it can perform satisfactory temperature measurement on the test specimens, and at the same time apply crosswinds to the test specimens and measure wind speed, thereby improving the test effect and enhancing the operational reliability and accuracy of the test system. Attached Figure Description

[0011] The following description, in conjunction with the accompanying drawings, further illustrates the internal air-cooling device of this utility model for a high and low temperature test chamber:

[0012] Figure 1 This is a schematic diagram of the internal layout of the high and low temperature test chamber, which is described by the internal air-cooling device.

[0013] Figure 2 This is a wireframe diagram illustrating the component connection logic of the internal air-cooling device in this high and low temperature test chamber.

[0014] In the picture:

[0015] 1-High and low temperature test chamber, 2-Mechanical property test bench, 3-Centralized control mechanism, 4-Three-phase adjustable power supply;

[0016] 11-Axial flow fan, 12-Anemometer, 13-Thermocouple, 14-Displacement sensor, 31-PLC controller, 32-Control terminal, 33-Frequency converter. Detailed Implementation

[0017] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0018] In the description of this utility model, it should be understood that the terms "left", "right", "front", "rear", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] The present invention will be further described below with specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0020] Implementation method 1: such as Figure 1 , 2 As shown, the internal air-cooling device of this high and low temperature test chamber includes a high and low temperature test chamber 1, a mechanical property testing platform 2, a central control mechanism 3, and a three-phase adjustable power supply 4. The three-phase adjustable power supply 4 is connected to the high and low temperature test chamber 1 via the central control mechanism 3, and the high and low temperature test chamber 1 is connected to the mechanical property testing platform 2. The high and low temperature test chamber 1 is equipped with a clamping fixture for fixing the test specimen, an axial flow fan 11 for applying crosswinds to the test specimen, an anemometer 12 for feedback of the crosswind speed, a thermocouple 13 for measuring the ambient temperature inside the high and low temperature test chamber, and a displacement sensor 14 for measuring the mechanical properties of the test specimen. The anemometer 12 is arranged on the upper and lower sides of the clamping fixture, and the thermocouple 13 is located on one side of the clamping fixture. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0021] Implementation method 2: such as Figure 2As shown, the centralized control mechanism 3 of the internal air-cooling device of this high and low temperature test chamber includes a PLC controller 31 and a control terminal 32 connected via wired / wireless communication, as well as a frequency converter 33. The control terminal communicates with the PLC controller for remote control and real-time monitoring; the frequency converter adjusts the power supply frequency of the axial flow fan according to the control signal from the PLC controller to achieve wind speed regulation. The output terminals of the anemometer 12 and thermocouple 13 are respectively connected to the feedback signal input terminal of the PLC controller 31. The anemometer collects wind speed signals and feeds them back to the PLC controller, which automatically adjusts the wind speed; during the low temperature test, the thermocouple measures the temperature and feeds it back to the PLC controller, which then regulates the temperature of the high and low temperature test chamber. The output terminal of the displacement sensor 14 is connected to the detection signal input terminal of the mechanical characteristic test bench 2. The displacement sensor sends the mechanical characteristic signals measured under high voltage, rated voltage, and low voltage conditions to the mechanical characteristic test bench, which processes the signals and then displays, stores, and uploads them. The three-phase adjustable power supply 4 is connected in three ways: one to the test sample, one to the high and low temperature test chamber via PLC controller 31, and one to the axial flow fan 11 via PLC controller 31 and frequency converter 33. The one connected to the test sample provides high voltage, rated voltage, and low voltage to the test sample for performance testing; the one connected to the high and low temperature test chamber supplies power to the heating and cooling mechanisms of the chamber and uses the PLC for power supply start / stop regulation; the one connected to the axial flow fan supplies power to the fan motor and uses the PLC and frequency converter for power supply start / stop and frequency regulation. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0022] Implementation method 3: such as Figure 1 As shown, the internal air-cooling device of this high and low temperature test chamber has at least three anemometers 12 installed above and below the clamping fixture, and thermocouples 13 installed on one side of the clamping fixture. The innermost anemometer 12 is located 0.5m from the clamping fixture, with a spacing of 0.3m between adjacent anemometers 12. The innermost anemometer 12 is 0.5m from the clamping fixture. The thermocouples 13 are located 1m horizontally from the clamping fixture and are positioned slightly above the plane of the clamping fixture. This layout of the wind speed and temperature measuring devices maximizes compliance with the new testing requirements. The remaining structures and components are as described in Embodiment 1 and will not be repeated.

[0023] During operation: The three-phase adjustable power supply provides one power source for the PLC controller and another for the test product. One power source for the PLC controller supplies power to both the high and low temperature test chamber and the axial flow fan. The test product is fixed in the test fixture within the high and low temperature test chamber and equipped with a displacement sensor. The control terminal sets the wind speed and chamber temperature, sending this information to the PLC controller. The PLC controller controls the frequency converter to rotate the axial flow fan, generating crosswinds. The wind speed measured by the anemometer is converted into an electrical signal and fed back to the PLC controller. The PLC uses this wind speed feedback to adjust the frequency converter output, thereby controlling the axial flow fan speed. The ambient temperature is measured by thermocouples around the test product, and the thermocouple signals are fed back to the PLC controller. The test temperature of the high and low temperature test chamber is comprehensively controlled based on the feedback signals from the temperature sensors and thermocouples. The test product's power supply is adjusted via the three-phase adjustable power supply, and the displacement sensor sends mechanical characteristic parameters at high voltage, rated voltage, and low voltage to the mechanical characteristic test bench. The control terminal can perform remote monitoring, including setting test parameters such as voltage, high and low temperatures and wind speed of the test object, and at the same time monitor the test results of the mechanical characteristic test bench.

[0024] The internal air-cooling device of this high and low temperature test chamber overcomes the shortcomings of existing high and low temperature test chambers, such as temperature measurement not meeting the new regulations and inability to apply crosswinds to the test specimens while simultaneously measuring wind speed. It can perform satisfactory temperature measurement on the test specimens and apply crosswinds to the test specimens while measuring wind speed, thereby improving the test effect and enhancing the operational reliability and accuracy of the test system.

[0025] The above description illustrates the main features, basic principles, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments or examples described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the above embodiments or examples should be considered exemplary and not restrictive. The scope of this utility model is defined by the appended claims rather than the foregoing description, and therefore all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0026] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. An internal air-cooling device for a high and low temperature test chamber, characterized in that: The test chamber includes a high and low temperature test chamber (1), a mechanical property test bench (2), a central control mechanism (3), and a three-phase adjustable power supply (4). The three-phase adjustable power supply (4) is connected to the high and low temperature test chamber (1) via the central control mechanism (3), and the high and low temperature test chamber (1) is connected to the mechanical property test bench (2). The high and low temperature test chamber (1) is equipped with a clamping fixture for fixing the test specimen, an axial flow fan (11) for applying crosswind to the test specimen, an anemometer (12) for feeding back the crosswind speed, a thermocouple (13) for measuring the ambient temperature inside the high and low temperature test chamber, and a displacement sensor (14) for measuring the mechanical properties of the test specimen. The anemometer (12) is arranged on the upper and lower sides of the clamping fixture, and the thermocouple (13) is arranged on one side of the clamping fixture.

2. The internal air-cooling device of the high and low temperature test chamber according to claim 1, characterized in that: The centralized control mechanism (3) includes a PLC controller (31) and a control terminal (32) connected by wired / wireless communication, as well as a frequency converter (33).

3. The internal air-cooling device of the high and low temperature test chamber according to claim 2, characterized in that: The output terminals of the anemometer (12) and thermocouple (13) are respectively connected to the feedback signal input terminal of the PLC controller (31).

4. The internal air-cooling device of the high and low temperature test chamber according to claim 3, characterized in that: The output end of the displacement sensor (14) is connected to the detection signal input end of the mechanical characteristic test bench (2).

5. The internal air-cooling device of the high and low temperature test chamber according to claim 4, characterized in that: The three-phase adjustable power supply (4) is connected to the test sample in one phase, to the high and low temperature test chamber via the PLC controller (31), and to the axial flow fan (11) via the PLC controller (31) and frequency converter (33).

6. The internal air-cooling device of the high and low temperature test chamber according to claim 5, characterized in that: At least three anemometers (12) are installed on the top and bottom of the clamping fixture, and the thermocouples (13) are installed on one side of the clamping fixture. The innermost anemometer (12) is installed 0.5m away from the clamping fixture, and the distance between adjacent anemometers (12) is 0.3m. The innermost anemometer (12) is 0.5m away from the clamping fixture. The thermocouples (13) are installed 1m away from the clamping fixture at a horizontal distance and are located slightly above the plane of the clamping fixture.

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