Expansion and shrinkage fatigue test device for corrugated radiator

Abstract

The utility model discloses a corrugated radiator expansion and shrinkage fatigue experiment device, and belongs to the technical field of transformer testing. The corrugated radiator expansion and shrinkage fatigue experiment device comprises an equipment box body, a corrugated radiator, an air supply assembly and a pressure detection assembly, and the repeated expansion and shrinkage process of the corrugated radiator in the use process of a transformer can be simulated by inflating or exhausting air into a first cavity and a second cavity through the air exhaust assembly. The corrugated radiator expansion and shrinkage fatigue test device is used for testing the expansion and shrinkage fatigue life of the corrugated radiator and the welding quality of the corrugated radiator and an equipment box body, the safety and energy saving performance of the corrugated radiator expansion and shrinkage fatigue test device can be improved, and the operation difficulty of the corrugated radiator expansion and shrinkage fatigue test device can also be reduced. According to the corrugated radiator expansion and shrinkage fatigue experiment device, the expansion and shrinkage strength of the corrugated radiator can be more accurately controlled through the compressibility of the gas, the experiment conditions can be monitored and adjusted in real time through matched use of the pressure detection assembly and the gas supply assembly, and the accuracy of the experiment result is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to transformer test technical field, especially a kind of corrugated radiator expansion and contraction fatigue experimental device. BACKGROUND

[0002] With the progress of science and technology and the development of electric power industry, as the basic equipment of power transmission and distribution, transformer is widely used in industry, agriculture, transportation, urban community and other fields, and transformer is a device for changing alternating voltage by electromagnetic induction. Oil-immersed transformer is a new type of high-performance transformer with more reasonable structure and better performance. Oil-immersed transformer uses transformer oil as insulation and heat dissipation medium to ensure its normal operation at high temperature.

[0003] At present, oil-immersed transformer usually includes core, winding, oil tank, oil pillow, insulating sleeve, tap changer and gas relay, wherein the oil tank is usually corrugated sheet oil tank, and the corrugated sheet oil tank includes tank body and corrugated radiator distributed around the tank body. When the load of transformer or the ambient temperature changes, the transformer oil in the transformer will also change in volume due to thermal expansion and contraction, and the corrugated radiator has the functions of heat dissipation and compensation of volume change of transformer oil.

[0004] Since the load of transformer changes constantly during operation, the corrugated radiator needs to withstand repeated expansion and contraction changes, so it is particularly important for technicians to know the process parameters under which the corrugated radiator of transformer has a longer expansion and contraction fatigue life. Therefore, an experimental device capable of testing the expansion and contraction fatigue of corrugated radiator is urgently needed. UTILITY MODEL CONTENT

[0005] The utility model embodiment provides a kind of corrugated radiator expansion and contraction fatigue experimental device. It can solve the problem of the prior art that an experimental device capable of testing the expansion and contraction fatigue of corrugated radiator is urgently needed, and the technical solution is as follows:

[0006] The corrugated radiator expansion and contraction fatigue experimental device includes equipment tank body, corrugated radiator, gas supply assembly and pressure detection assembly.

[0007] The corrugated radiator is installed on the equipment tank body, the equipment tank body has a first chamber, the corrugated radiator has a second chamber, and the first chamber and the second chamber are communicated.

[0008] The gas supply assembly is communicated with the first chamber, and is used to deliver gas into the first chamber and the second chamber, or extract gas in the first chamber and the second chamber.

[0009] The pressure detection assembly is installed on the equipment tank body, and is used to detect the air pressure in the first chamber and the second chamber.

[0010] Optionally, the air supply assembly comprises an air charging unit, an air exhausting unit and a valve unit, the air charging unit, the air exhausting unit and the valve unit are electrically connected with the pressure detection assembly;

[0011] The valve unit is capable of switching between a first open state and a second open state, when the valve unit is in the first open state, the valve unit is in communication with the air charging unit and the first chamber respectively, when the valve unit is in the second open state, the valve unit is in communication with the air exhausting unit and the first chamber respectively.

[0012] Optionally, the air charging unit comprises an air charging pump and a first pipeline;

[0013] The air charging pump is electrically connected with the pressure detection assembly;

[0014] The first pipeline is in communication with the air charging pump and the valve unit respectively.

[0015] Optionally, the air exhausting unit comprises an air exhausting pump and a second pipeline;

[0016] The air exhausting pump is electrically connected with the pressure detection assembly;

[0017] The second pipeline is in communication with the air exhausting pump and the valve unit respectively.

[0018] Optionally, the valve unit comprises a three-way electromagnetic valve and a third pipeline;

[0019] The three-way electromagnetic valve comprises an air inlet end, an air outlet end and a communication end, the air inlet end is in communication with the first pipeline, the air outlet end is in communication with the second pipeline;

[0020] The third pipeline is in communication with the communication end of the three-way electromagnetic valve and the first chamber respectively.

[0021] Optionally, the pressure detection assembly comprises a pressure sensor and a comparator, the pressure sensor is electrically connected with the comparator, the comparator is electrically connected with the air supply assembly.

[0022] Optionally, the corrugated radiator expansion and contraction fatigue experiment device further comprises an alarm unit, the alarm unit is electrically connected with the pressure detection assembly, and is used for issuing an alarm according to an output level of the pressure detection assembly.

[0023] Optionally, the alarm unit comprises at least one of a sound alarm assembly and an optoelectronic alarm assembly;

[0024] The sound alarm assembly and the optoelectronic alarm assembly are installed on the outside of the equipment box body.

[0025] Optionally, the corrugated radiator expansion and contraction fatigue experiment device further comprises a counting component.

[0026] The counting component is electrically connected with at least one of the inflation unit, the air extraction unit and the valve unit, and is configured to record the opening times of at least one of the inflation unit, the air extraction unit and the valve unit.

[0027] Optionally, the gas comprises air or inert gas.

[0028] The technical scheme provided by the embodiment of the utility model has at least the following beneficial effects:

[0029] The utility model discloses a kind of corrugated radiator expansion and contraction fatigue experiment devices, comprising: equipment cabinet, corrugated radiator, gas supply component and pressure detection component, by air extraction component to first chamber and second chamber inflation or air extraction, can simulate the process that corrugated radiator repeatedly expands and contracts in the use process of transformer, to test the expansion and contraction fatigue life of corrugated radiator and the welding quality of corrugated radiator and equipment cabinet, can improve the security and energy saving of corrugated radiator expansion and contraction fatigue experiment device, also can reduce the operation difficulty and test cost of corrugated radiator expansion and contraction fatigue experiment device.And the compressibility of gas makes that corrugated radiator expansion and contraction fatigue experiment device can more accurately control the expansion and contraction intensity of corrugated radiator, by the cooperation of pressure detection component and gas supply component, can real-time monitoring and adjustment experimental condition, improve the accuracy of experimental result. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in embodiment description, obviously, the drawing in the following description is only some embodiments of the utility model, for those skilled in the art, under the premise of not paying creative labor, other drawings can also be obtained according to these drawings.

[0031] Figure 1 It is the structure schematic diagram of a kind of corrugated radiator expansion and contraction fatigue experiment device provided by the embodiment of the utility model;

[0032] Figure 2 It is the connection structure schematic diagram of a kind of three-way electromagnetic valve provided by the embodiment of the utility model. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical scheme and advantage of the utility model more clearly, the following will be further detailed to the embodiment of the utility model with the drawings.

[0034] While the present application can be susceptible to embodiment in different forms, there are shown in the drawings, and will be described herein in detail, specific embodiments with the understanding that the present disclosure is to be considered an exemplification of the principles of the application, and is not intended to limit the application to that as illustrated and described herein.

[0035] It is to be understood that every feature that is described in this specification is to be considered as an example of a characteristic of the present application. It is also to be understood that every combination of features that is described in this specification is to be considered as an example of a combination of characteristics of the present application. Thus, the present application is not to be considered as being limited to the specific embodiments that are described herein.

[0036] In the embodiments shown in the drawings, the indications of direction, such as up, down, left, right, front and rear, are used to explain the structure and movement of the various elements of the present application are not absolute but relative. These indications are appropriate when the elements are in the position shown in the drawings. If the position of the elements is changed, the indications of direction are changed accordingly.

[0037] The oil-immersed transformer generally comprises a core, a winding, an oil tank, an oil pillow, an insulating sleeve, a tapping switch and a gas relay, wherein the oil tank is generally a corrugated sheet oil tank, which comprises a tank body and corrugated radiators distributed around the tank body. The oil-immersed transformer has the characteristics of simple structure, light weight and easy automation mass production. When the oil-immersed transformer operates, heat is generated, causing a temperature difference inside the transformer, so that the transformer oil in the transformer produces natural convection, and the transformer oil with increased temperature flows back to the tank after being cooled by the corrugated radiators, so as to reduce the internal temperature of the transformer.

[0038] When the load of the transformer changes during operation or the ambient temperature of the transformer changes, the temperature of the transformer oil in the transformer will also change, causing the volume of the transformer oil in the transformer to change due to thermal expansion and contraction. Since the wall thickness of the tank in the oil-immersed transformer is greater than that of the corrugated radiator, the expansion and contraction of the corrugated radiator is generally relied on to compensate for the volume change of the transformer oil caused by temperature changes, that is, the corrugated radiator has the functions of heat dissipation and compensation of the volume change of the transformer oil.

[0039] Since the load of the transformer during operation is constantly changing, the corrugated radiator needs to withstand repeated expansion and contraction changes, therefore the welding quality of the corrugated radiator in the transformer, that is, the expansion and contraction fatigue life of the corrugated radiator is an important factor to measure the performance of the corrugated radiator. Usually, the welding method of the corrugated radiator adopts argon arc welding, which is a welding process that does not add welding materials during welding, and relies on the electric arc between the electrode and the workpiece to melt the workpiece together at high temperature. Since the welding quality of the corrugated radiator has a great relationship with the process parameters of the welding machine during welding, therefore through the expansion and contraction fatigue life test of the corrugated radiator, the number of expansion and contraction changes that the corrugated radiator welded under which process parameters can withstand the most can be experimented, so that the best process parameters of the welded corrugated radiator can be obtained through the experiment.

[0040] In a kind of corrugated radiator expansion and contraction fatigue experimental method, directly use oil-immersed transformer as experimental device, adopt transformer oil as the carrier of test, by extracting and injecting pressure oil, simulate the test of corrugated radiator expansion and contraction condition, test whether expansion and contraction of corrugated radiator under specified number will damage.

[0041] However, using transformer oil as the carrier of expansion and contraction experiment has the following problems: when the corrugated radiator in the experiment is damaged after many experiments, the transformer oil leakage caused may pollute the environment, so that the corrugated radiator expansion and contraction fatigue experimental device needs complex recovery and processing system; transformer oil is a kind of special chemical substance, which needs strict safety management measures during use and storage, which includes special requirements for storage container, fire and explosion prevention measures, and strict safety procedures during transportation and operation, to prevent oil leakage or fire accident, etc., the above problems increase the operation difficulty, test cost and safety risk of corrugated radiator expansion and contraction fatigue experimental device.

[0042] The above part and all technical problems can be optimized by the limited embodiments of the utility model.

[0043] Please refer to Figure 1 , Figure 1 is a structure schematic view of a corrugated radiator expansion and contraction fatigue experimental device provided by the embodiments of the utility model, and the corrugated radiator expansion and contraction fatigue experimental device can include: equipment box body 11, corrugated radiator 12, gas supply assembly 13 and pressure detection assembly 14.

[0044] The equipment box body 11 can have a first chamber, and the equipment box body 11 can be equivalent to the box body for accommodating the core and winding in the oil-immersed transformer. The corrugated radiator 12 can be installed on the equipment box body 11, and the corrugated radiator 12 can have a second chamber, and the first chamber and the second chamber are communicated. The corrugated radiator 12 can be welded and connected with the equipment box body 11, so that the sealing between the first chamber and the second chamber is better.

[0045] The gas supply assembly 13 is in communication with the first chamber and is used to supply gas into the first chamber and the second chamber or to extract gas from the first chamber and the second chamber. The device box 11 can have a connecting through hole, and the gas supply assembly 13 can be in communication with the connecting through hole to communicate with the first chamber of the device box 11 through the connecting through hole. The connecting through hole can serve as both a gas inlet hole and a gas outlet hole.

[0046] The pressure detection assembly 14 can be installed on the device box 11 to detect the pressure in the first chamber and the second chamber. The device box 11 can have a test through hole, and the pressure detection assembly 14 can be installed outside the test through hole. The test end of the pressure detection assembly 14 can extend into the interior of the device box 11 through the test through hole to detect the pressure in the first chamber and the second chamber. Since the first chamber and the second chamber are in communication, the gas pressure in the first chamber is the same as the gas pressure in the second chamber.

[0047] The first chamber and the second chamber can be referred to as a gas chamber. The gas supply assembly 13 can be used to supply gas into the gas chamber to increase the gas pressure in the gas chamber. The pressure detection assembly 14 can monitor the pressure in the gas chamber in real time. When the gas pressure in the gas chamber reaches a first target pressure, the supply of gas into the gas chamber is stopped. The first target pressure can be an upper limit pressure set by an experimenter according to the maximum expansion pressure that the corrugated radiator 12 can withstand during the actual use of the oil-immersed transformer. For example, the upper limit pressure can be in the range of 20 kPa to 50 kPa, and the upper limit pressure can be 30 kPa.

[0048] After the gas pressure in the gas chamber reaches the first target pressure, the gas supply assembly 13 can extract gas from the gas chamber to decrease the gas pressure in the gas chamber. When the gas pressure in the gas chamber reaches a second target pressure, the extraction of gas from the gas chamber is stopped. The second target pressure can be a lower limit pressure set by an experimenter according to the maximum contraction pressure that the corrugated radiator 12 can withstand during the actual use of the oil-immersed transformer. In this way, without injecting transformer oil into the device box 11 and the corrugated radiator 12, the gas supply assembly can be used to supply gas or extract gas from the first chamber and the second chamber to simulate the expansion and contraction process of the corrugated radiator 12 during the use of the transformer to test whether the corrugated radiator 12 will be damaged (e.g., gas leakage) after a specified number of expansions and contractions. This can improve the safety and energy efficiency of the corrugated radiator expansion and contraction fatigue test device. It also reduces the difficulty of operating the corrugated radiator expansion and contraction fatigue test device and the cost of the test.

[0049] In the embodiment of the utility model, gas is used as the test carrier, which can avoid the pollution caused by the leakage of transformer oil to the environment, and can reduce the negative impact on the environment. Moreover, without complex oil recovery and processing system, the equipment cost and maintenance cost are reduced. At the same time, the use and operation of gas are relatively simple, without special oil storage and processing equipment, the convenience of test operation is improved.

[0050] In addition, the compressibility of the gas enables the corrugated radiator expansion and contraction fatigue test device to more accurately control the expansion and contraction strength of the corrugated radiator 12, and through the cooperation of the pressure detection assembly 14 and the gas supply assembly 13, the experimental conditions can be monitored and adjusted in real time, and the accuracy of the experimental results is improved.

[0051] In summary, the utility model discloses a kind of corrugated radiator expansion and contraction fatigue test device, comprising: equipment cabinet 11, corrugated radiator 12, gas supply assembly 13 and pressure detection assembly 14, by air extraction component to first chamber and second chamber Inflation or air extraction, the process that corrugated radiator 12 repeatedly expands and contracts in the use process of transformer can be simulated, to test the expansion and contraction fatigue life of corrugated radiator 12 and the welding quality of corrugated radiator 12 and equipment cabinet 11, the safety and energy saving of corrugated radiator expansion and contraction fatigue test device can be improved, the operation difficulty and test cost of corrugated radiator expansion and contraction fatigue test device can also be reduced. Moreover, the compressibility of the gas enables the corrugated radiator expansion and contraction fatigue test device to more accurately control the expansion and contraction strength of the corrugated radiator 12, and through the cooperation of the pressure detection assembly 14 and the gas supply assembly 13, the experimental conditions can be monitored and adjusted in real time, and the accuracy of the experimental results is improved.

[0052] Please refer to Figure 1 In an alternative embodiment, the gas supply assembly 13 can include an inflation unit 131, an air extraction unit 132 and a valve unit 133, one end of the valve unit 133 is connected with the equipment cabinet 11, the other end of the valve unit 133 is connected with the inflation unit 131 and the air extraction unit 132 respectively, and the inflation unit 131, the air extraction unit 132 and the valve unit 133 are electrically connected with the pressure detection assembly 14.

[0053] The valve unit 133 can be switched between the first open state and the second open state, when the valve unit 133 is in the first open state, the valve unit 133 is in communication with the inflation unit 131 and the first chamber respectively, when the valve unit 133 is in the second open state, the valve unit 133 is in communication with the air extraction unit 132 and the first chamber respectively. In this way, the valve unit 133 can be used in cooperation with the inflation unit 131 to deliver gas to the first chamber and the second chamber, and the valve unit 133 can also be used in cooperation with the air extraction unit 132 to extract gas from the first chamber and the second chamber.

[0054] And, the state of the valve unit 133 can be switched according to the real-time pressure in the gas chamber by the gas pressure in the gas chamber detected by the pressure detection component 14.

[0055] In an alternative embodiment, the inflation unit 131 can include an inflation pump 1311 and a first pipeline 1312; the inflation pump 1311 is electrically connected with the pressure detection component 14; the first pipeline 1312 is respectively communicated with the inflation pump 1311 and the valve unit 133. The inflation unit 131 can be turned on or off by the gas pressure in the gas chamber detected by the pressure detection component 14.

[0056] In an alternative embodiment, the exhaust unit 132 can include an exhaust pump 1321 and a second pipeline 1322; the exhaust pump 1321 is electrically connected with the pressure detection component 14; the second pipeline 1322 is respectively communicated with the exhaust pump 1321 and the valve unit 133. The inflation unit 131 can be turned on or off by the gas pressure in the gas chamber detected by the pressure detection component 14.

[0057] Please refer to Figure 2 , Figure 2 is a connection structure schematic diagram of a three-way electromagnetic valve provided by the embodiment of the utility model, in an alternative embodiment, the valve unit 133 can include a three-way electromagnetic valve 1331 and a third pipeline 1332; the three-way electromagnetic valve 1331 can include an air inlet end d1, an air outlet end d2 and a communication end d3, the air inlet end d1 is communicated with the first pipeline 1312, the air outlet end d2 is communicated with the second pipeline 1322; the third pipeline 1332 is respectively communicated with the communication end d3 of the three-way electromagnetic valve 1331 and the first chamber. The air inlet and air outlet of the gas chamber can be controlled respectively by the three-way electromagnetic valve 1331, and the structure of the corrugated radiator expansion and contraction fatigue test device can be simplified.

[0058] In an alternative embodiment, the pressure detection component 14 includes a pressure sensor 141 and a comparator, the pressure sensor 141 is electrically connected with the comparator, and the comparator is electrically connected with the gas supply component 13. The positive phase input end of the comparator is electrically connected with the output end of the pressure sensor 141, and the negative phase input end is connected with a preset target pressure threshold or reference voltage. When the pressure monitored by the pressure sensor 141 exceeds the first target pressure threshold, the sampling signal voltage will be higher than the first reference voltage, and the comparator can output a first level signal, otherwise, when the pressure monitored by the pressure sensor 141 is lower than the second target pressure threshold, the sampling signal voltage will be lower than the reference voltage, and the comparator can output a second level signal. The three-way electromagnetic valve 1331, the inflation pump 1311 and the exhaust pump 1321 can receive the output signal from the comparator, and adjust the state of turning on or off according to the level state of the signal.

[0059] In an exemplary embodiment, the equipment cabinet 11 can have an exhaust valve, and the pressure sensor 141 can be installed on the exhaust valve of the equipment cabinet 11.

[0060] In an exemplary embodiment, the bellows radiator expansion and contraction fatigue test device can further comprise a controller 15, the comparator can be integrated in the controller 15, and the pressure sensor 141 can be electrically connected with the controller 15. The controller 15 comprises a programmable logic controller 15 for controlling the test process, and a touch screen for human-computer interaction, facilitating the experimental personnel to set the experimental parameters. The controller 15 can be wired or wirelessly connected with the pressure sensor 141, the three-way electromagnetic valve 1331, the air charging pump 1311 and the air exhausting pump 1321 respectively.

[0061] In an exemplary embodiment, the bellows radiator expansion and contraction fatigue test device further comprises an alarm unit 16, which is electrically connected with the pressure detection assembly 14 and used for issuing an alarm according to the output level of the pressure detection assembly 14. When an abnormal situation occurs during the experiment, for example, the pressure detection assembly 14 detects that the pressure in the first chamber and the second chamber is much greater than the first target pressure, that is, the alarm pressure is reached, indicating that the air supply assembly 13 may be malfunctioning. In this case, the experimental personnel can be reminded in time by the alarm unit 16 to stop the machine in time to avoid the damage from expanding. The alarm unit 16 can also be electrically connected with the controller 15.

[0062] In an exemplary embodiment, the alarm unit 16 comprises at least one of a sound alarm component and an optoelectronic alarm component; the sound alarm component and the optoelectronic alarm component are installed on the outside of the equipment cabinet 11. For example, the sound alarm component can comprise a buzzer. The optoelectronic alarm component can comprise an LED lamp. Alternatively, the alarm information can also be displayed on the touch screen, and when the alarm information is displayed on the touch screen, the worker can timely understand the on-site situation to make corresponding emergency treatment mode.

[0063] In an alternative embodiment, the bellows radiator expansion and contraction fatigue test device can further comprise a counting assembly; the counting assembly is electrically connected with at least one of the air charging unit 131, the air exhausting unit 132 and the valve unit 133, and is used for recording the opening times of at least one of the air charging unit 131, the air exhausting unit 132 and the valve unit 133. The counting assembly can be integrated in the controller 15, the controller 15 can automatically and repeatedly perform the expansion and contraction fatigue test according to the set parameters, and record the times to facilitate the experimental personnel to organize the experimental data. Moreover, when the experimental times reach the experimental requirements, the experiment can be automatically ended.

[0064] It should be noted that the corrugated radiator expansion and contraction fatigue test device in the embodiment of the utility model can also include: power socket, switching power supply, relay and other components to ensure the normal operation of the corrugated radiator expansion and contraction fatigue test device. The controller 16 can be integrated in the control system, which can include a PLC control system.

[0065] In an alternative embodiment, the gas includes air or inert gas. For example, the gas can include nitrogen or helium and other stable gases with high stability, which can improve the actual operability and safety performance of the experimental device.

[0066] In an exemplary embodiment, the experimental method of the corrugated radiator expansion and contraction fatigue test device provided by the embodiment of the utility model can include the following steps:

[0067] Step 201, turn on the controller 15, set the required inflation upper limit pressure, exhaust lower limit pressure, alarm pressure, test number zero and other operations through the touch screen, and click the start button.

[0068] Step 202, the controller 15 outputs a control signal to switch the three-way electromagnetic valve 1331 to communicate with the inflation pump 1311, and starts the inflation pump 1311. The gas supply assembly 13 inflates the equipment box 11 and the corrugated radiator 12.

[0069] Step 203, when the pressure sensor 141 detects that the pressure inside the equipment box 11 and the corrugated radiator 12 reaches the inflation upper limit pressure, the controller 15 outputs a control signal to switch the electromagnetic valve to be connected with the vacuum pump, stops the inflation pump 1311, and starts the vacuum pump. The gas supply assembly 13 exhausts from the equipment box 11 and the corrugated radiator 12.

[0070] Step 204, when the pressure sensor 141 detects that the pressure reaches the exhaust lower limit pressure, the controller 15 outputs a control signal to switch the electromagnetic valve back to be connected with the inflation pump 1311 again, stops the vacuum pump and starts the inflation pump 1311.

[0071] Step 205, repeatedly charge and exhaust the process in steps 202-204 to simulate the expansion and contraction of the transformer, so as to test the expansion and contraction fatigue life of the corrugated radiator 12 and the weld between the corrugated radiator 12 and the equipment box 11.

[0072] Step 206, during the execution of the above steps 201-205, the controller 15 records the expansion and contraction times, and when the expansion and contraction times reach the test requirement, the test is automatically ended, and the electromagnetic valve is switched to be connected with the vacuum pump, and the vacuum pump is stopped.

[0073] Step 207, the corrugated radiator 12 is detected by the experimenter to determine whether the corrugated radiator 12 has a gas leakage point, or whether the other parameters of the corrugated radiator 12 meet the requirements.

[0074] And, in the process of executing the above steps 201-206 during the test process, when the pressure sensor 141 detects that the pressure exceeds the pre-set alarm pressure, the controller 15 automatically stops the test and issues an alarm.

[0075] To sum up, the utility model embodiment provides a kind of corrugated radiator expansion and contraction fatigue experimental device, comprising: equipment box 11, corrugated radiator 12, gas supply component 13 and pressure detection component 14, by air extraction component to first chamber and second chamber inflation or air extraction, can simulate the process that corrugated radiator 12 repeatedly expands and contracts in the process of transformer use, to test the expansion and contraction fatigue life of corrugated radiator 12 and the welding quality of corrugated radiator 12 and equipment box 11, can improve the safety and energy saving of corrugated radiator expansion and contraction fatigue experimental device, also can reduce the operation difficulty and test cost of corrugated radiator expansion and contraction fatigue experimental device.And, the compressibility of gas makes that corrugated radiator expansion and contraction fatigue experimental device can more accurately control the expansion and contraction intensity of corrugated radiator 12, by the cooperation of pressure detection component 14 and gas supply component 13, can real-time monitoring and adjustment experimental condition, improve the accuracy of experimental result.

[0076] It should be noted that in the drawings, the dimensions of the regions can be exaggerated for clarity. Also, it is to be understood that when a certain element is referred to as being on another element, it can be directly on the other element or intervening elements can also be present. In addition, it is to be understood that when a certain element is referred to as being under another element, it can be directly under the other element or one or more intervening elements can also be present. In addition, it is to be understood that when a certain element is referred to as being between two elements, it can be the only element between the two elements or one or more intervening elements can also be present. Like reference numerals refer to like elements throughout.

[0077] In the utility model, the terms "first" and "second" are used only for descriptive purposes and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more, unless otherwise explicitly limited.

[0078] The above description is only optional embodiments of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A corrugated heat sink expansion and contraction fatigue test device, characterized by, The device box, the corrugated radiator, the air supply assembly and the pressure detection assembly are included. The corrugated radiator is installed on the device box, the device box has a first chamber, the corrugated radiator has a second chamber, and the first chamber and the second chamber are communicated. The air supply assembly is communicated with the first chamber and is used for conveying air into the first chamber and the second chamber or extracting air in the first chamber and the second chamber. The pressure detection assembly is installed on the device box and is used for detecting air pressure in the first chamber and the second chamber. The air supply assembly includes an air charging unit, an air extraction unit and a valve unit, one end of the valve unit is connected with the device box, the other end of the valve unit is connected with the air charging unit and the air extraction unit respectively, and the air charging unit, the air extraction unit and the valve unit are electrically connected with the pressure detection assembly.

2. The bellows heat sink expansion fatigue test apparatus according to claim 1, wherein The valve unit can be switched between a first opening state and a second opening state, when the valve unit is in the first opening state, the valve unit is communicated with the air charging unit and the first chamber respectively, when the valve unit is in the second opening state, the valve unit is communicated with the air extraction unit and the first chamber respectively. The air charging unit includes an air charging pump and a first pipeline.

3. The bellows heat sink expansion fatigue test apparatus of claim 2, wherein The air charging pump is electrically connected with the pressure detection assembly. The first pipeline is communicated with the air charging pump and the valve unit respectively. The air extraction unit includes an air extraction pump and a second pipeline.

4. The bellows heat sink expansion fatigue test apparatus of claim 3, wherein The air extraction pump is electrically connected with the pressure detection assembly. The second pipeline is communicated with the air extraction pump and the valve unit respectively. The valve unit includes a three-way electromagnetic valve and a third pipeline.

5. The bellows heat sink expansion fatigue test apparatus of claim 4, wherein The three-way electromagnetic valve includes an air inlet end, an air outlet end and a communication end, the air inlet end is communicated with the first pipeline, and the air outlet end is communicated with the second pipeline. The third pipeline is communicated with the communication end of the three-way electromagnetic valve and the first chamber respectively. The pressure detection assembly includes a pressure sensor and a comparator, the pressure sensor is electrically connected with the comparator, and the comparator is electrically connected with the air supply assembly.

6. The bellows fatigue test apparatus for corrugated heat spreaders according to any one of claims 1 to 5, characterized by The corrugated radiator expansion and contraction fatigue test device further includes an alarm unit, the alarm unit is electrically connected with the pressure detection assembly, and is used for issuing an alarm according to an output level of the pressure detection assembly.

7. The bellows heat sink expansion and contraction fatigue test apparatus according to any one of claims 1 to 5, characterized by The alarm unit includes at least one of a sound alarm assembly and an optoelectronic alarm assembly.

8. The bellows heat sink expansion fatigue test apparatus of claim 7, wherein, The sound alarm assembly and the optoelectronic alarm assembly are installed on the outside of the device box. The corrugated radiator expansion and contraction fatigue test device further includes a counting assembly.

9. The bellows heat sink expansion fatigue test apparatus of claim 2, wherein The counting assembly is electrically connected with at least one of the air charging unit, the air extraction unit and the valve unit respectively, and is used for recording the opening times of at least one of the air charging unit, the air extraction unit and the valve unit. The air includes air or inert gas.

10. The bellows heat sink expansion fatigue test apparatus of claim 1, wherein, ​

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