A test oven

Abstract

The utility model relates to product high temperature resistant test field especially, and a kind of test oven, including cabinet, temperature sensor and heater are equipped in cabinet, it is characterized in that, cabinet is equipped with with outside heat exchange air exchange mechanism, air exchange mechanism includes air exchange valve, and one-way flow introduction runner, export runner, air exchange valve has the opening angle of the gas cross-sectional area change, the gas is the cold flow and hot flow respectively guided by introduction runner, export runner;The utility model sends out heat energy and introduces cold flow in the form of air exchange when facing high heat load, reach the purpose of the balance inside cabinet, in the whole air exchange process, the heat quantity of load in heavy load operation is fully utilized to heat cold flow, to reduce the output power of heater, even, in part temperature test environment, the operation of heater can be stopped, for this, select this more clean, environmental protection cooling means, so that the overall power consumption is significantly reduced.

Description

Technical Field

[0001] This utility model relates to the field of high temperature resistance testing, and more particularly to a testing oven. Background Technology

[0002] Product aging is an inevitable process of product lifespan reduction.

[0003] Aging screening tests are used to accelerate the wear and tear of a product's lifespan. Typically, this is achieved by overusing the product, causing its runtime to reach one-tenth of its total usage time prematurely. Once the usage time exceeds one-tenth, the product is considered to be in a stable range.

[0004] By conducting aging screening tests, products are brought into a stable zone where occasional failures occur. Faulty products are kept in the factory, while products that do not show any faults are left for users, ensuring that the products delivered to users are reliable.

[0005] Traditional high-load test ovens are constructed by adding an exhaust fan, inlet and outlet air ducts, and valves to the structure of a standard oven. During load testing, the inlet and outlet air valves are opened, and the exhaust fan blows cold air into the oven through the inlet valve while simultaneously expelling hot air through the outlet valve. The exhaust air carries away the heat generated by the load to maintain temperature balance inside the oven. Therefore, the fan specifications must be selected based on the maximum load heat generation, and the cooling capacity of the supplied air must be greater than or equal to the heat generation of the test load. The cool air is blown into the oven by the fan, and then heated by an auxiliary heater to maintain temperature balance inside the oven.

[0006] However, the current valve structure dictates that the inflow and outflow of gas are constant. In order to control the temperature testing environment inside the chamber, the auxiliary heater operates continuously. The operation of this auxiliary heater has a significant impact on the overall power consumption and is not environmentally friendly. Utility Model Content

[0007] To address the aforementioned problems, this utility model provides a testing oven designed to solve the issue of high power consumption.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a test oven, comprising a chamber, wherein a temperature sensor and a heater are provided inside the chamber, characterized in that the chamber is provided with a ventilation mechanism for heat exchange with the outside, the ventilation mechanism comprising a ventilation valve, and a unidirectional flow inlet channel and an outlet channel, the ventilation valve having an opening and closing angle that changes the cross-sectional area of ​​the gas, wherein the gas is a cold flow and a hot flow guided by the inlet channel and the outlet channel, respectively.

[0009] The beneficial effects of this utility model are:

[0010] When faced with high heat loads, this invention delivers heat and introduces cold air through ventilation to achieve internal balance within the enclosure. During the entire ventilation process, the heat generated by the load under heavy operation is fully utilized to heat the cold air, thereby reducing the output power of the heater. Furthermore, in certain temperature testing environments, the heater can be stopped. Therefore, this cleaner and more environmentally friendly cooling method significantly reduces overall power consumption.

[0011] Specifically, the ventilation mechanism includes a ventilation shell with an open structure at the top and bottom. Two independent inlet and outlet channels are formed by partitions inside the ventilation shell. The ventilation valve is rotatably connected to the bottom of the partitions. During rotation, either end of the valve is screwed into the inlet channel and the other end is screwed out of the outlet channel, or vice versa. The advantage of this structure is that it can be compatible with drive methods that have linear adjustment capabilities (e.g., controlling a stepper motor with analog signals to achieve a linear output, resulting in a gradual change in the opening angle of the ventilation valve). This significantly expands the adjustable temperature range, allowing the ventilation valve's opening angle to be automatically adjusted based on the heat generated by the load inside the chamber, thus controlling the temperature stability within the chamber through valve opening reduction or adjustment.

[0012] In this specific embodiment, the ventilation valve synchronously adjusts the opening and closing angles of the inlet and outlet channels.

[0013] Advantageously, the enclosure is equipped with a circulating fan, creating a unidirectional gas flow channel within the enclosure, as seen in the cross-section. Figure 2 As you can see, the gas flows in the direction of the arrow; in addition, this cross-sectional view demonstrates the fully open state of the circulating air duct inside the chamber when the ventilation valve is closed: during operation, the heater and heat load inside the chamber heat up together, so that the temperature test environment quickly rises to the target value;

[0014] Figure 3 With the ventilation valve fully open (when the temperature is very high during heavy-load operation), the internal circulation duct of the box is closed: During operation, the circulating fan draws in the cold air outside the box, heats the cold air, and then sends the heated air into the inside of the box to remove the heat inside the box and guide the heat out through the outlet duct to achieve the requirement of rapid cooling.

[0015] Figure 4The control and adjustment state of the ventilation valve is as follows: When the temperature inside the chamber reaches the set temperature value, the temperature controller PID calculates and controls the opening degree of the ventilation valve, controlling the intake and exhaust of the ventilation valve to open synchronously; the circulating airflow of the circulating fan inside the chamber creates an air pressure difference between the inlet channel, the outlet channel and the outside of the chamber, the outlet channel is under positive pressure to discharge some of the hot air inside the chamber; the inlet channel is under negative pressure to draw in the cold air outside the chamber; after being stirred by the circulating fan, the air circulates inside the chamber, still maintaining the high temperature uniformity requirement of the chamber.

[0016] In other words, part of the heat generated by the heat load is discharged to the outside of the chamber through the opening of the ventilation valve, and the other part of the heat is used to maintain the temperature balance inside the chamber. The constant temperature process can maintain the temperature inside the chamber without the need for the heater to work, thereby achieving the purpose of energy saving.

[0017] A better design is that the ventilation shell is located at the top of the chamber, which facilitates heat exchange between gases.

[0018] The air supply method of this utility model is a forced ventilation circulation; in this specific embodiment, it has the following parameters:

[0019] 1. Temperature range: +50℃~+150℃ (ambient temperature less than 25℃);

[0020] 2. Temperature fluctuation: ±0.5℃;

[0021] 3. Temperature uniformity: ±3.0℃;

[0022] 4. Heating time: Approximately 90 minutes to heat from 50℃ to 150℃ under no-load conditions;

[0023] 5. Internal load: DC fan, total power 6kW, total weight 150kg (including fixtures).

[0024] The measured load-carrying capacity of this specific embodiment:

[0025] Serial Number Test conditions / ℃ Temperature output / % Ambient temperature / °C Can store the product's heat output 1 60 1.6 30±2℃ 9kW

[0026] Measured heating and cooling rates: RT = 30 ± 2℃ under no-load conditions;

[0027] Heating rate: 30℃→150℃ 45min 2.7℃ / min;

[0028] Cooling rate: 150℃→50℃ 11min 9.1℃ / min.

[0029] Actual energy consumption calculation:

[0030] Serial Number Test conditions / ℃ Ambient temperature / °C power consumption Load conditions 1 50 30±2℃ 0.5kW*h Unloaded 2 80 30±2℃ 0.9kW*h Unloaded 3 100 30±2℃ 1.1kW*h Unloaded 4 150 30±2℃ 1.8kW*h Unloaded 5 70 30±2℃ 0.58kW*h 6kW

[0031] It should be noted that the enclosure consists of an outer casing and an inner casing. The inner casing is located inside the outer casing and is used to house the heat load. The inner casing has at least one pair of symmetrical sides with ventilation holes. The ventilation shell, heater, and circulating fan are located inside the outer casing and above the inner casing. Only then will the airflow follow a unidirectional flow process. Attached Figure Description

[0032] Figure 1 This is a perspective view of the present invention.

[0033] Figure 2 This is a cross-sectional view showing the gas flow when the ventilation valve is closed. (Green represents cold flow, and red represents hot flow).

[0034] Figure 3 This is a cross-sectional view showing the gas flow when the ventilation valve is fully open.

[0035] Figure 4 This is a cross-sectional view showing the flow of gas when the ventilation valve is adjusted.

[0036] Figure 5 This is a perspective view of the present invention in cross-section. Detailed Implementation

[0037] Please see Figure 1-5 As shown, a test oven includes a chamber 4, inside which a temperature sensor and a heater 1 are provided. The chamber 4 is characterized by having a ventilation mechanism for heat exchange with the outside environment. The ventilation mechanism includes a controllable ventilation valve 21 and a unidirectional flow inlet channel 22 and outlet channel 23. The opening of the ventilation valve 21 synchronously cuts off or opens the fluid in the inlet channel 22 and outlet channel 23.

[0038] A test oven includes a chamber body 4, inside which a temperature sensor and a heater 1 are provided. The chamber body 4 is characterized by having a ventilation mechanism for heat exchange with the outside environment. The ventilation mechanism includes a ventilation valve 21 and a unidirectional flow inlet channel 22 and an outlet channel 23. The ventilation valve 21 has an opening and closing angle that changes the cross-sectional area of ​​the gas. The gas is a cold flow and a hot flow guided by the inlet channel 22 and the outlet channel 23, respectively.

[0039] The beneficial effects of this utility model are:

[0040] When facing a high heat load 5, this utility model uses ventilation to send out heat energy and introduce cold air, so as to achieve a temperature change towards the calibrated value. In the whole process, there is no need to use a fan to send cold air into the oven body 4. The cooling method adopts a cleaner and more environmentally friendly approach, which ultimately achieves the effect of reducing power consumption. The heater 1 operates in a low power consumption mode, or even does not work at all.

[0041] When facing a high-heat load 5, this invention delivers heat and introduces cold air through ventilation to achieve internal balance within the housing 4. During the entire ventilation process, the heat generated by the load under heavy load is fully utilized to heat the cold air, thereby reducing the output power of the heater 1. Furthermore, under certain temperature testing conditions, the operation of the heater 1 can be stopped. Therefore, this cleaner and more environmentally friendly cooling method significantly reduces the overall power consumption.

[0042] Specifically, the ventilation mechanism includes a ventilation housing 24, which has an open structure at its upper and lower ends. Two independent inlet channels 22 and outlet channels 23 are formed by setting a partition 25 inside the ventilation housing 24. The ventilation valve 21 is rotatably connected to the bottom of the partition 25. When rotating, either end of the ventilation valve 21 is screwed into the inlet channel 22 and the other end is screwed out of the outlet channel 23, or either end of the ventilation valve 21 is screwed into the outlet channel 23 and the other end is screwed into the outlet channel 23. The advantage of this structure is that it can fit the linear adjustment drive mode, which makes the temperature adjustable range larger. Thus, the opening and closing angle of the ventilation valve 21 can be automatically adjusted according to the heat generation of the heat load 4 in the chamber, and the temperature inside the chamber 4 can be stabilized by controlling the reduction of the opening of the ventilation valve 21.

[0043] The use of a drive method with linear adjustment function (for example, controlling a stepper motor through analog signals so that the stepper motor has a linear output, ultimately causing the opening and closing angle of the ventilation valve 21 to change gradually) significantly expands the temperature adjustable range. This allows the opening and closing angle of the ventilation valve 21 to be automatically adjusted according to the amount of heat generated by the four heat loads in the chamber, thereby controlling the stability of the temperature inside the chamber by reducing or decreasing the opening of the ventilation valve 21.

[0044] In this specific embodiment, the ventilation valve synchronously adjusts the opening and closing angles of the inlet and outlet channels.

[0045] Preferably, a circulating fan 5 is installed inside the housing 4, creating a unidirectional gas flow channel within the housing 4, as seen in the cross-section. Figure 2 As you can see, the gas flows in the direction of the arrow; in addition, this cross-sectional view shows the fully open state of the circulating air duct inside the box 4 when the ventilation valve 21 is closed: during operation, the heater 1 and the heat load 5 inside the box 4 heat up together, quickly raising the temperature to the target value;

[0046] Figure 3With the ventilation valve 21 fully open (when the temperature is very high during heavy-load operation), the internal circulation duct of the box 4 is closed: During operation, the circulating fan 5 draws in the cold air outside the box 4, sends the air into the box 4 to remove the heat inside the box 4, and guides the heat out through the outlet duct 23 to achieve the requirement of rapid cooling.

[0047] Figure 4 The control and adjustment state of the ventilation valve 21 is as follows: When the temperature inside the chamber 4 reaches the set temperature value, the temperature controller PID calculates and controls the opening degree of the ventilation valve 21, controlling the intake and exhaust of the ventilation valve 21 to open synchronously; using the circulating airflow of the circulating fan 5 inside the chamber 4, a pressure difference is formed between the inlet channel 22, the outlet channel 23 and the outside of the chamber 4. The outlet channel 23 is under positive pressure to discharge some of the hot air inside the chamber 4; the inlet channel 22 is under negative pressure to draw in the cold air outside the chamber 4; after being stirred by the circulating fan 5, the air circulates inside the chamber 4, still maintaining the high temperature uniformity requirement of the chamber 4.

[0048] In other words, part of the heat generated by the heat load 5 is discharged to the outside of the chamber 4 through the opening of the ventilation valve 21, and the other part of the heat is used to maintain the temperature balance inside the chamber 4. The constant temperature process can maintain the temperature inside the chamber 4 without the heater 1 working, thereby achieving the purpose of energy saving.

[0049] Preferably, the ventilation shell 24 is located at the top of the housing 4, which facilitates heat exchange between gases.

[0050] The air supply method of this utility model is a forced ventilation circulation; in this specific embodiment, it has the following parameters:

[0051] 1. Temperature range: +50℃~+150℃ (ambient temperature less than 25℃);

[0052] 2. Temperature fluctuation: ±0.5℃;

[0053] 3. Temperature uniformity: ±3.0℃;

[0054] 4. Heating time: Approximately 90 minutes to heat from 50℃ to 150℃ (under no-load conditions);

[0055] 5. Internal load: DC fan, total power 6kW, total weight 150kg (including fixtures).

[0056] The measured load-carrying capacity of this specific embodiment:

[0057] Serial Number Test conditions / ℃ Temperature output / % Ambient temperature / °C Can store the product's heat output 1 60 1.6 30±2℃ 9kW

[0058] Measured heating and cooling rates: RT = 30 ± 2℃ under no-load conditions;

[0059] Heating rate: 30℃→150℃ 45min 2.7℃ / min;

[0060] Cooling rate: 150℃→50℃ 11min 9.1℃ / min.

[0061] Actual energy consumption calculation:

[0062] Serial Number Test conditions / ℃ Ambient temperature / °C power consumption Load conditions 1 50 30±2℃ 0.5kW*h Unloaded 2 80 30±2℃ 0.9kW*h Unloaded 3 100 30±2℃ 1.1kW*h Unloaded 4 150 30±2℃ 1.8kW*h Unloaded 5 70 30±2℃ 0.58kW*h 6kW

[0063] It should be noted that the housing 4 includes an outer housing 41 and an inner housing 42. The inner housing 42 is located inside the outer housing 41. The interior of the inner housing 42 is used to place the heat load 5. The inner housing 42 has at least a pair of symmetrical sides, and the sides have ventilation holes 42a. The ventilation housing 24, the heater 1, and the circulating fan 5 are located inside the outer housing 41 and above the inner housing 42. Only then will the airflow follow a unidirectional flow process.

[0064] Additionally, it should be noted that the outer casing 41 is provided with an air inlet, and the air inlet 41-a is connected to the inlet channel 22.

[0065] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A test oven, comprising a chamber, wherein a temperature sensor and a heater are disposed within the chamber, characterized in that, The enclosure is equipped with a ventilation mechanism for heat exchange with the outside environment. The ventilation mechanism includes a ventilation valve and a one-way flow inlet channel and outlet channel. The ventilation valve has an opening and closing angle that changes the cross-sectional area of ​​the gas. The gas is a cold flow and a hot flow guided by the inlet channel and outlet channel, respectively.

2. The test oven according to claim 1, characterized in that, The ventilation valve synchronously adjusts the opening and closing angles of the inlet and outlet flow channels.

3. A test oven according to claim 1, characterized in that, The ventilation mechanism includes a ventilation housing with an open structure at the top and bottom. Two independent inlet and outlet channels are formed by setting a partition inside the ventilation housing. The ventilation valve is rotatably connected to the bottom of the partition. When rotating, either end of the ventilation valve is screwed into the inlet channel and the other end is screwed out of the outlet channel, or either end of the ventilation valve is screwed into the outlet channel and the other end is screwed into the outlet channel.

4. A test oven according to claim 3, characterized in that, The chamber is equipped with a circulating fan, which creates a unidirectional gas flow channel inside the chamber.

5. A test oven according to claim 3, characterized in that, The ventilation shell is located at the top of the enclosure.

6. A test oven according to claim 4, characterized in that, The enclosure consists of an outer casing and an inner casing. The inner casing is located inside the outer casing and is used to house the heat load. The inner casing has at least one pair of symmetrical sides with ventilation holes. The ventilation shell, heater, and circulating fan are located inside the outer casing and above the inner casing.

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