Normal-pressure temperature-resistant test box for testing electric heater

Abstract

The invention relates to a normal-pressure temperature-resistant test box for testing an electric heater in the field of test boxes, which comprises a control cabinet, the side end of the control cabinet is connected with a test cabinet, the control cabinet is fixedly connected with a plurality of sub-control boxes, the sub-control boxes are provided with control switches and temperature controllers, and two pairs of vertical brackets are arranged in the test cabinet. A plurality of ceramic terminal strips matched with the sub-control boxes are installed in the control cabinet, auxiliary test structures are installed in the sub-test boxes and comprise guide beams, and the lower ends of the guide beams are fixedly connected with a plurality of placement plates used for placing the film heaters to be tested; the side end of the guiding beam is rotatably connected with an auxiliary heat exchange plate used for cooling through a stepping motor, and a pair of induced draft fans used for air inlet and air outlet of the guiding beam are installed on the branch test box. According to the invention, independent temperature regulation and control and performance test can be carried out on the plurality of film heaters at the same time, and the test accuracy and efficiency are effectively improved.

Description

Technical Field

[0001] The present invention relates to a test box for testing an electric heater, and in particular to a normal pressure and temperature resistance test box for testing an electric heater, which is applied in the field of test boxes. Background Art

[0002] Existing test chambers for electric heaters are specifically designed to simulate and test the performance of electric heaters. They typically include one or more heating units that provide precise temperature control and distribution to simulate various operating environments and conditions. The chambers are equipped with temperature sensors and data logging systems to monitor and record key parameters such as temperature changes, power consumption, and thermal efficiency during testing. Furthermore, the chambers are equipped with safety features to ensure safe operation during testing. These tests enable manufacturers to assess heater performance, reliability, and durability to meet industry standards and customer requirements.

[0003] The specification of Chinese invention patent CN116159605A discloses a baking device suitable for high-temperature testing of thin-film heaters, including a thin-film heater suspension plate, a lamp array, a suspension mechanism, a connection mechanism, and a fixed support mechanism. In this invention, a large number of external heat flow simulation heaters can simultaneously perform high-temperature baking and degassing test tasks in a vacuum and low-temperature environment to check whether there are manufacturing defects during the pasting process of multi-layer insulation material components. It has the characteristics and advantages of simple structure and convenient implementation.

[0004] The specification of Chinese invention patent CN108536192B discloses a heater test control device and control method. The heater test control device is electrically connected to an electronic control unit and a vehicle heater. This embodiment of the invention allows the heater to be tested in conjunction with the entire vehicle. During the vehicle performance test, the heater can determine the heating status based on the status of the vehicle engine and can monitor and collect the heater test data in real time.

[0005] Existing test chambers are inconvenient for independent temperature control testing of multiple heaters, have low test efficiency, are easily disturbed by ambient temperature, and lack the ability to handle abnormal situations during temperature control testing. Summary of the Invention

[0006] In view of the above-mentioned existing technologies, the technical problem to be solved by the present invention is that the existing test chamber is inconvenient for independent temperature control testing of multiple heaters, the test efficiency is low, it is easily disturbed by the ambient temperature, and it lacks the ability to handle abnormal situations during the temperature control test.

[0007] To solve the above problems, the present invention provides a normal pressure temperature resistance test chamber for testing electric heaters, comprising a control cabinet, a test cabinet connected to the side end of the control cabinet, a plurality of sub-control boxes fixedly connected to the control cabinet, a control switch and a temperature controller installed on the sub-control boxes, two pairs of vertical brackets installed in the test cabinet, a plurality of ceramic terminal blocks respectively matched with the sub-control boxes installed in the control cabinet, and a plurality of evenly distributed terminals fixedly connected to the ceramic terminal blocks;

[0008] A sub-test box matching the ceramic terminal block is detachably connected to the control cabinet, and an auxiliary test structure is installed in the sub-test box. The auxiliary test structure includes a guide beam, and a plurality of placement plates for placing the thin film heaters to be tested are fixedly connected to the lower end of the guide beam, and the placement plates are provided with terminal blocks for connecting the thin film heaters. The guide beam is connected to a terminal block matching the plurality of terminal blocks, and the terminal block is electrically connected to the ceramic terminal block.

[0009] The side end of the guide beam is connected to an auxiliary heat exchange plate through a stepper motor, and a temperature sensor is installed on the placement plate. The placement plate and the auxiliary heat exchange plate are arranged in pairs to form a test unit.

[0010] An air intake channel and an exhaust channel are provided in the guide beam, a pair of conduits are connected between the auxiliary heat exchange plate and the guide beam and are communicated with the air intake channel and the exhaust channel respectively, and an air duct communicating with the pair of conduits is provided in the auxiliary heat exchange plate;

[0011] A pair of exhaust fans are installed on the sub-test box to guide the air intake and exhaust of the beam respectively.

[0012] In the above-mentioned normal pressure temperature resistance test chamber for testing electric heaters, independent temperature control and performance testing of multiple thin film heaters are achieved simultaneously. Real-time monitoring, analysis and processing of test data are achieved through the auxiliary test system, effectively improving the accuracy and efficiency of the test.

[0013] As a further improvement of the present application, each test unit is provided with a corresponding number, and the temperature controller displays the monitoring data of the temperature sensors at each placement plate in each numbered test unit.

[0014] As a further improvement of the present application, a three-way solenoid valve matching each test unit is installed in the air intake channel, a flow valve is installed at the input end of the solenoid valve, an exhaust cover connected to the upper output end of the three-way solenoid valve is fixedly connected to the upper end of the guide beam, and the side output end of the three-way solenoid valve is connected to a conduit.

[0015] As a further improvement of the present application, a refrigeration device is installed at the bottom of the test cabinet, the lower end of the ceramic terminal row is fixedly connected to a guide beam matching the guide beam, and a conduit for connecting the guide beam and the refrigeration device is connected to the vertical guide rail.

[0016] As another improvement of the present application, ambient temperature detectors are installed on both the inside and outside of the sub-test box, and wires for connecting the ambient temperature detectors to the ceramic terminal block are embedded in the sub-test box. One end of the sub-test box is open and an observation window is installed at the other opposite end.

[0017] As another improved supplement of the present application, an auxiliary test system is also included, the auxiliary test system includes a processor, and the processor is connected to a monitoring module, a control module and a data processing module;

[0018] The monitoring module is used to collect monitoring data from each sub-test chamber; the temperature sensor and the ambient temperature detector are both connected to the monitoring module signal;

[0019] The data processing module is used to process and analyze monitoring data and select processing strategies based on the monitoring data;

[0020] The control module is used to control the designated equipment to work according to the processing strategy selected by the data processing module; the induced fan, refrigeration equipment and auxiliary test structure are all connected to the control module signal.

[0021] As another improved supplement to the present application, when conducting tests in the test chamber, the temperature changes on the surface of the test piece are monitored, and the temperature measuring element displays the temperature changes on the temperature controller. When the temperature is abnormal, the temperature controller outputs a signal to the input end of the relay, affecting the on and off of the heating circuit connected to the output end, so that the test piece to be tested can stop heating. When the surface temperature of the test piece to be tested drops to a set range, the temperature controller outputs a signal to the signal input end of the relay, and the ceramic terminal block of the relay controls the connection of the heating circuit connected to the output end, so that the temperature of the test piece to be tested rises, and the above work is repeated to realize the temperature control test of the test piece to be tested.

[0022] As another improvement of the present application, during the test process conducted in the test chamber, when an abnormal temperature of the test piece is detected, the heating of the test piece is stopped, and then it can be actively cooled to reduce its temperature to the set value; then after waiting for other test pieces to complete a temperature control test, heating control is unified with other test pieces.

[0023] As another improvement of the present application, during the test process conducted in the test chamber, when an abnormal temperature of the test piece is detected, the heating of the test piece is stopped, and then it can be actively cooled to reduce its temperature to the set value; then after waiting for other test pieces to complete a temperature control test, heating control is unified with other test pieces.

[0024] In summary, the independent temperature control and performance testing of multiple thin film heaters were achieved simultaneously. The auxiliary test system realized real-time monitoring, analysis and processing of test data, effectively improving the accuracy and efficiency of the test. At the same time, the test chamber has a compact structure and comprehensive functions, which can make full use of space resources and facilitate the conduct of multiple groups of tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a three-dimensional diagram of the test box without the cabinet door according to the first embodiment of the present application;

[0026] Figure 2 for Figure 1 Schematic diagram of the structure at A in the middle;

[0027] Figure 3 This is a perspective view of the back of the test box according to the first embodiment of the present application;

[0028] Figure 4 This is a side sectional view of the test cabinet according to the first embodiment of the present application;

[0029] Figure 5 for Figure 4 Schematic diagram of the structure at B in the middle;

[0030] Figure 6 This is a front cross-sectional view of the first embodiment of the present application;

[0031] Figure 7 for Figure 6 Schematic diagram of the structure at C in the middle;

[0032] Figure 8 This is a system block diagram of the second implementation method of this application.

[0033] Description of the numbers in the figure:

[0034] 1. Control cabinet; 2. Test cabinet; 3. Sub-control box; 4. Ceramic terminal block; 5. Sub-test box; 6. Auxiliary test structure; 61. Guide beam; 62. Placement plate; 63. Auxiliary heat exchange plate; 64. Conduit; 65. Exhaust cover. DETAILED DESCRIPTION

[0035] The following describes three implementation methods of the present application in detail with reference to the accompanying drawings.

[0036] The first implementation method:

[0037] Figure 1-7It is shown that a normal pressure temperature resistance test chamber for testing electric heaters includes a control cabinet 1, a test cabinet 2 is connected to the side end of the control cabinet 1, a plurality of sub-control boxes 3 are fixedly connected to the control cabinet 1, and a control switch and a temperature controller are installed on the sub-control box 3. The sub-control box 3 mainly controls the surface temperature of the test piece, sets the heating time of the test piece, and switches the heating circuit on and off. The test observation cabinet can place multiple groups of test pieces and conduct normal pressure temperature resistance tests at the same time. The data acquisition system records the test data to facilitate data analysis.

[0038] During the test, the heating circuit is powered by a DC regulated power supply with a maximum output voltage of 300V, a current of 5A, a maximum power of 1.5kW, and a display accuracy of 4 digits.

[0039] During the test, the temperature controller limits the heating temperature of the test piece. The measurement accuracy is better than ±0.5°C, facilitating subsequent over-temperature alarm and over-temperature disconnection functions. The timer can be used to set the heating time and heating cycle. The relay acts as a bridge between the temperature control circuit and the heating circuit, receiving the output signal of the temperature controller to control the on and off of the heating circuit, ensuring that the surface temperature of the test piece is maintained within the target temperature range of the temperature controller.

[0040] Two pairs of vertical brackets are installed in the test cabinet 2, and multiple ceramic terminal blocks 4 matching each sub-control box 3 are installed in the control cabinet 1. Multiple evenly distributed terminals are fixedly connected to the ceramic terminal blocks 4;

[0041] A sub-test box 5 matching the ceramic terminal block 4 is detachably connected to the control cabinet 1. A cabinet door is installed at one end of the test cabinet 2 facing the opening of the sub-test box 5. When the cabinet door is closed, the opening of the sub-test box 5 is sealed. A honeycomb mesh is opened at the other end, and a filter is installed on the honeycomb mesh. The honeycomb mesh is opposite to the observation window on the sub-test box 5. On the one hand, it is used to observe the sub-test box 5, and on the other hand, it is convenient for the fan to introduce external airflow.

[0042] An auxiliary test structure 6 is installed in the sub-test box 5. The auxiliary test structure 6 includes a guide beam 61. The lower end of the guide beam 61 is fixedly connected to a plurality of placement plates 62 for placing the thin film heaters to be tested. The placement plates 62 are provided with terminal blocks for connecting the thin film heaters. The guide beam 61 is connected to a terminal block that matches the plurality of terminal blocks, and the terminal block is electrically connected to the ceramic terminal block 4.

[0043] The side end of the guide beam 61 is connected to the auxiliary heat exchange plate 63 through a stepper motor. The stepper motor is embedded in the guide beam 61 and can be installed by a person skilled in the art using a suitable stepper motor in the prior art, such as a 42BYG hybrid stepper motor.

[0044] The bottom of the auxiliary heat exchange plate 63 is provided with heat exchange fins, and a temperature sensor is installed on the placement plate 62; the temperature sensor adopts a T-shaped thermocouple, which can achieve the requirements of measuring temperature range of -200℃~+350℃ and measurement accuracy of ±0.3℃~1℃;

[0045] The placement plate 62 and the auxiliary heat exchange plate 63, which are arranged in pairs, are organized into a test unit. In the initial position, the auxiliary heat exchange plate 63 is perpendicular to the placement plate 62. At this time, the auxiliary heat exchange plate 63 can be used to isolate two adjacent placement plates 62. The auxiliary heat exchange plate 63 is rotated 90 degrees to face the placement plate 62, and the placement plate 62 and the auxiliary heat exchange plate 63 maintain a set distance. At this time, the auxiliary heat exchange plate 63 is in contact with the thin film heater on the placement plate 62.

[0046] An air intake channel and an air exhaust channel are defined within the guide beam 61. A pair of conduits 64 are connected between the auxiliary heat exchange plate 63 and the guide beam 61, communicating with the air intake channel and the air exhaust channel, respectively. An air passage communicating with the pair of conduits 64 is defined within the auxiliary heat exchange plate 63, and heat exchange fins are inserted into the air passage.

[0047] A pair of exhaust fans connected to the auxiliary test structure 6 are installed on the sub-test box 5; the pair of exhaust fans both pass through one end of the sub-test box 5, the output end of one exhaust fan communicates with the air inlet channel in the guide beam 61, and the other exhaust fan communicates with the exhaust channel in the guide beam 61. The pair of exhaust fans are used to guide the beam 61 for air intake and exhaust respectively.

[0048] The function of the induced air fan is to provide external airflow to the auxiliary heat exchange plate 63 or the guide beam 61 , so as to quickly cool the auxiliary heat exchange plate 63 by exchanging heat with the thin film heater.

[0049] Each test unit is provided with a corresponding number, and the temperature controller displays the monitoring data of the temperature sensors at each placement plate 62 in each numbered test unit.

[0050] A three-way solenoid valve matching each test unit is installed in the air intake channel, a flow valve is installed at the input end of the solenoid valve, an exhaust cover 65 connected to the upper output end of the three-way solenoid valve is fixedly connected to the upper end of the guide beam 61, the side output end of the three-way solenoid valve is connected to a conduit 64, and the other conduit 64 is connected to the exhaust channel.

[0051] In this solution, the DC regulated power supply provides output voltage and current. The output current is within 5A. The thermal load on the surface of the test piece (film heater to be tested) is P=I 2R, different test piece resistance values ​​correspond to different temperature increases; a relay is set in the heating circuit. When the temperature measured by the temperature controller reaches the set target temperature, the temperature controller can control the relay to switch, so that the surface temperature of the test piece is controlled within the set range; during the test, the ceramic terminal block can be connected in parallel to multiple test pieces. When the test piece needs to be heated for different cycles, the timer can be selected to set multiple groups of time switches to meet the technical indicator requirements of setting 16 groups of switching times; the temperature change of the thermocouple is used as the initial output information, which will be received by the information acquisition system and the temperature information at different times will be saved;

[0052] When conducting the test, connect the film heater to be tested to the terminal, and attach the temperature sensor on the guide beam 61 to the temperature measurement area of ​​the film heater; then turn on the power switch of the sub-control box 3, operate the temperature controller, and set the test target temperature; turn on the control switch, gradually increase the output voltage of the DC regulated power supply, and the temperature sensor transmits temperature data to the temperature controller, and the temperature controller displays that the temperature of the film heater has risen; when the temperature of the film heater reaches the target temperature, the temperature controller controls the relay switch to operate, and the temperature of the film heater is stabilized within the target temperature setting range; set the timing switch to realize the start and stop of the test; turn on and set the data acquisition function, the temperature sensor transmits temperature data to the data collector to realize real-time temperature monitoring, and save the data after the test.

[0053] At the start of the test, the target temperature is set using a temperature controller. As the heating process progresses, the surface temperature of the thin film heater gradually rises. During the test, if the temperature of a thin film heater rises above the set temperature, the temperature controller immediately sends a signal to stop heating the thin film heater. At this time, the stepper motor controls the auxiliary heat exchange plate 63 corresponding to the thin film heater to rotate until it is in contact with it. Air is then introduced into the auxiliary heat exchange plate 63 to rapidly cool it. During the cooling process, the induced draft fan continuously provides airflow to the auxiliary heat exchange plate, exchanging heat between the heat exchange fins and the airflow in the airway, effectively reducing the temperature of the test piece. When the temperature drops to the set value, the system waits for the other test pieces to complete a temperature control test.

[0054] After all test pieces have completed a temperature control test, the system uniformly controls the heating of each test piece and continues the subsequent test process. During the entire test process, the data acquisition system records the test data in real time, including key parameters such as temperature, heating time, and heating power, providing strong support for subsequent data analysis.

[0055] The test chamber also features over-temperature alarm and disconnection. When the test piece's temperature exceeds the set safety range, the system automatically shuts off the heating circuit, ensuring a safe and reliable test process. A timer allows for setting the heating time and cycle, enabling automated test control and improving test efficiency and accuracy.

[0056] In summary, the atmospheric pressure temperature resistance test chamber for testing electric heaters not only enables independent temperature control and performance testing of multiple thin-film heaters simultaneously, but also, through its auxiliary test structure and data acquisition system, enables real-time monitoring, analysis, and processing of test data, effectively improving test accuracy and efficiency. Furthermore, the chamber's compact structure and comprehensive functionality make full use of space resources, facilitate multiple test runs, and provide strong technical support for performance testing of electric heaters.

[0057] The sub-test box 5 of this embodiment realizes efficient temperature control and test environment support; ensures independent temperature control of each individual thin film heater during the test process, and facilitates adjustment of the internal environment of the test environment.

[0058] In summary, the sub-test chamber 5 of this embodiment plays a key role in the normal pressure temperature resistance test chamber for electric heater testing, effectively improving the accuracy and efficiency of the test, and making full use of space resources to facilitate the conduct of multiple groups of tests.

[0059] Second implementation method:

[0060] Figure 8 As shown, a refrigeration device is installed at the bottom end of the test cabinet 2, and a guide beam matching the guide beam 61 is fixedly connected to the lower end of the sub-test box 5, and the guide beam is connected to the air inlet channel in the guide beam 61;

[0061] A conduit for connecting the guide beam and the refrigeration equipment is connected to the vertical guide rail. A person skilled in the art can select a suitable refrigeration equipment in the prior art for installation. The refrigeration equipment is used to output cooling airflow; and the refrigeration equipment is provided with dual output ends, one output end is connected to the conduit, and the other output end is directed into the test cabinet 2, so that the refrigeration equipment can input cooling airflow into each sub-test box 5, and can also input cooling airflow into the environment inside the test cabinet 2;

[0062] Ambient temperature detectors are installed on both the inside and outside of the sub-test box 5. Wires for connecting the ambient temperature detectors to the ceramic terminal block 4 are embedded in the sub-test box 5. One end of the sub-test box 5 is open, and an observation window is installed on the other opposite end.

[0063] The ambient temperature detector realizes real-time monitoring and precise control of the ambient temperature in the test chamber, ensuring that abnormal environments inside and outside the test chamber can be discovered in time, providing reliable data support for the performance test of the thin film heater.

[0064] In this embodiment, the ambient temperature detector detects the temperature inside and outside the sub-test box 5. When the monitored temperature data is abnormal (for example, when the temperature sensor detects that the sampled value exceeds the set value by ±5°C for three consecutive times, it is determined to be a temperature abnormality), the refrigeration equipment is controlled to cool the inside and outside of the sub-test box 5.

[0065] When cooling the inside of the sub-test box 5, the refrigeration equipment guides the cooling airflow through the duct, the guide beam and the air inlet channel in the guide beam to the exhaust cover 65, and discharges the cooling airflow through the exhaust cover 65 to cool the internal environment of the sub-test box 5;

[0066] When cooling the outside of the sub-test box 5, if more than a set number of sub-test boxes 5 detect that the external ambient temperature data is greater than the set value, the refrigeration equipment will output cooling air to the test cabinet 2 to cool the environment inside the test cabinet 2;

[0067] This implementation achieves precise control of the test chamber's internal and external environments, effectively preventing the impact of ambient temperature on thin-film heater performance testing and improving test accuracy and reliability. Furthermore, by integrating refrigeration equipment with ambient temperature sensors, this solution enables intelligent temperature management, reduces manual intervention, and improves test efficiency.

[0068] The third implementation method:

[0069] Figure 8 As shown, it also includes an auxiliary test system, which includes a processor, and the processor is connected to a monitoring module, a control module and a data processing module;

[0070] The monitoring module is used to collect monitoring data at each sub-test box 5; the temperature sensor and the ambient temperature detector are both connected to the monitoring module signal; the monitoring module is connected to a data collector for monitoring data collection, and a suitable data collector in the prior art is selected by a technician in this field to monitor data collection, such as: DAQ970A.

[0071] The data processing module is used to process and analyze monitoring data and select processing strategies based on the monitoring data;

[0072] The control module is used to control the designated equipment to work according to the processing strategy selected by the data processing module; the induced fan, refrigeration equipment and auxiliary test structure 6 are all connected to the control module signal.

[0073] When the test is carried out in the test chamber 5, the temperature change of the surface of the test piece is monitored, and the temperature measuring element displays the temperature change on the temperature controller. When the temperature is abnormal (such as when the temperature sensor detects that the temperature sampling value exceeds the set value ±5℃ for a set number of consecutive times), the temperature controller outputs a signal to the input end of the relay, and the heating circuit connected to the output end is turned on and off, so that the test piece to be tested can stop heating. When the surface temperature of the test piece to be tested drops to the set range, the temperature controller outputs a signal to the signal input end of the relay, and the relay controls the heating circuit connected to its output end through the ceramic terminal block 4 to make the temperature of the test piece to be tested rise. This cycle is repeated to achieve the temperature control effect of the test piece to be tested.

[0074] During the test in the sub-test chamber 5, if the thin film heater detects that the temperature of the test piece is abnormal, the heating of the test piece is stopped, and then the test piece can be actively cooled to reduce its temperature to the set value; then, after the other test pieces have completed a temperature control test, heating control is unified with the other test pieces;

[0075] In summary, this solution enables independent temperature control and performance testing of multiple thin-film heaters simultaneously. The auxiliary test system enables real-time monitoring, analysis, and processing of test data, effectively improving test accuracy and efficiency. Furthermore, the compact and comprehensive test chamber makes full use of space resources and facilitates the conduct of multiple tests.

[0076] In view of current actual needs, the protection scope of the above-mentioned implementation mode adopted in this application is not limited to this. Various changes made within the knowledge scope of technical personnel in this field without departing from the concept of this application still fall within the protection scope of the present invention.

Claims

1. A normal pressure temperature resistance test chamber for testing electric heaters, comprising a control cabinet (1), a test cabinet (2) connected to the side end of the control cabinet (1), a plurality of sub-control boxes (3) fixedly connected to the control cabinet (1), a control switch and a temperature controller installed on the sub-control boxes (3), and two pairs of vertical brackets installed in the test cabinet (2), characterized in that: A plurality of ceramic terminal blocks (4) respectively matched with the sub-control boxes (3) are installed in the control cabinet (1), and a plurality of evenly distributed terminals are fixedly connected to the ceramic terminal blocks (4); A sub-test box (5) matching the ceramic terminal block (4) is detachably connected to the control cabinet (1), an auxiliary test structure (6) is installed in the sub-test box (5), and the auxiliary test structure (6) includes a guide beam (61), a lower end of the guide beam (61) is fixedly connected to a plurality of placement plates (62) for placing the thin film heater to be tested, and the placement plates (62) are provided with terminal blocks for connecting the thin film heaters, and a terminal block matching the plurality of terminal blocks is connected to the guide beam (61), and the terminal block is electrically connected to the ceramic terminal block (4); The side end of the guide beam (61) is connected to an auxiliary heat exchange plate (63) through a stepping motor, and a temperature sensor is installed on the placement plate (62); the placement plate (62) and the auxiliary heat exchange plate (63) arranged in pairs are organized into a test unit; An air intake channel and an air exhaust channel are provided in the guide beam (61); a pair of conduits (64) communicating with the air intake channel and the air exhaust channel respectively are connected between the auxiliary heat exchange plate (63) and the guide beam (61); an air passage communicating with the pair of conduits (64) is provided in the auxiliary heat exchange plate (63); A pair of induced-air fans are installed on the sub-test box (5) for guiding the air intake and exhaust of the beam (61) respectively.

2. The normal pressure temperature resistance test chamber for testing electric heaters according to claim 1, characterized in that: Each of the test units is provided with a corresponding number, and the temperature controller displays the monitoring data of the temperature sensors at each placement plate (62) in each numbered test unit.

3. The normal pressure temperature resistance test chamber for testing electric heaters according to claim 1, characterized in that: A three-way solenoid valve matching each test unit is installed in the air intake channel, a flow valve is installed at the input end of the solenoid valve, an exhaust cover (65) communicating with the upper output end of the three-way solenoid valve is fixedly connected to the upper end of the guide beam (61), and a side output end of the three-way solenoid valve is communicated with a conduit (64).

4. The normal pressure temperature resistance test chamber for testing electric heaters according to claim 1, characterized in that: A refrigeration device is installed at the bottom end of the test cabinet (2), a flow guide beam matching the guide beam (61) is fixedly connected to the lower end of the sub-test box (5), and a conduit for connecting the flow guide beam and the refrigeration device is connected to the vertical guide rail.

5. The normal pressure temperature resistance test chamber for testing electric heaters according to claim 1, characterized in that: Ambient temperature detectors are installed on both the inner and outer sides of the sub-test box (5), and a wire for connecting the ambient temperature detector to the ceramic terminal block (4) is embedded in the sub-test box (5). One end of the sub-test box (5) is open, and an observation window is installed on the other opposite end.

6. The normal pressure temperature resistance test chamber for testing electric heaters according to claim 1, characterized in that: It also includes an auxiliary test system, which includes a processor, and the processor is connected to a monitoring module, a control module and a data processing module; The monitoring module is used to collect monitoring data at each sub-test box (5); the temperature sensor and the ambient temperature detector are both connected to the monitoring module signal; The data processing module is used to process and analyze monitoring data and select a processing strategy based on the monitoring data; The control module is used to control the designated equipment to work according to the processing strategy selected by the data processing module; the induced draft fan, refrigeration equipment and auxiliary test structure (6) are all connected to the control module signal.

7. The normal pressure temperature resistance test chamber for testing electric heaters according to claim 1, characterized in that: When the test is carried out in the sub-test box (5), the temperature change of the surface of the test piece is monitored, and the temperature measuring element displays the temperature change on the temperature controller. When the temperature is abnormal, the temperature controller outputs a signal to the input end of the relay, affecting the on-off of the heating circuit connected to the output end, so that the test piece to be tested can stop heating. When the surface temperature of the test piece to be tested drops to a set range, the temperature controller outputs a signal to the signal input end of the relay, and the ceramic terminal block (4) of the relay controls the on-off of the heating circuit connected to the output end, so that the temperature of the test piece to be tested is increased. The above work is repeated to realize the temperature control test of the test piece to be tested.

8. The normal pressure temperature resistance test chamber for testing electric heaters according to claim 7, characterized in that: During the test in the sub-test box (5), when it is detected that the temperature of the test piece is abnormal, the heating of the test piece is stopped, and then it can be actively cooled to reduce its temperature to the set value; then, after waiting for other test pieces to complete a temperature control test, heating control is unified with the other test pieces.

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