Constant-temperature aging oven

Abstract

The utility model provides a constant temperature aging oven, which belongs to the technical field of aging ovens and comprises an oven body, a fan and a heating pipe, a heating cavity is arranged in the oven body, a cavity partition plate is transversely arranged at the top of the heating cavity and divides the heating cavity into an upper heating cavity and a lower heating cavity, and two ends of the cavity partition plate and the oven body form an air outlet and an air return port respectively. A heating pipe and a fan are arranged at the top end of the upper heating cavity, an air outlet of the fan faces the heating pipe, and the circulating hot airflow air duct structure comprises an air outlet air duct, an air return air duct, a mesh-shaped partition plate, an air outlet opening, an air return opening and an air return baffle. The two sides of the heating cavity are provided with an air outlet channel communicating with the air outlet and an air return channel communicating with the air return opening correspondingly. According to the constant-temperature aging oven, the temperature uniformity in the temperature rising process can be highly consistent, the aging effect is guaranteed, the temperature rising time can be shortened, and energy consumption is reduced.

Description

Technical Field

[0001] The utility model relates to a constant-temperature aging oven, belonging to the technical field of aging ovens. Background Technique

[0002] With the increasingly wide use of OLED light-emitting diodes, the usage environments of OLED light-emitting diodes are also various. In order to meet the requirements of various usage environments, it is necessary to conduct screening tests on OLED light-emitting diodes during the production of OLED light-emitting diodes.

[0003] The screening test refers to the test conducted to select products with certain characteristics or eliminate early-failure products. The screening test mainly refers to the test conducted to eliminate early-failure products. It is a non-destructive test for all products. By applying environmental stress according to a certain procedure, potential design and manufacturing defects of the products are stimulated, so as to eliminate early-failure products and reduce the failure rate.

[0004] Among them, the reverse voltage aging of OLED light-emitting diodes is to apply a reverse voltage to the product at high temperature. Since the leakage current increases at high temperature, under the action of temperature and electric field, poor-quality devices will fail. This method can be used to judge the quality of the production batch, especially the level of high-temperature performance.

[0005] It can be seen that the temperature in the aging state determines the final aging effect. Due to production capacity requirements, the current aging ovens are all large in volume, mostly about 5 m³. Their heating methods are all that the fan blows through the heating pipes to make the hot air circulate in the whole box. The specific differences mainly lie in the installation positions of the heating pipes and the fans and the circulating air mode. One is to set the fan and heating pipes at the top of the box, and the central fan vertically guides the heat into the oven for turbulent flow; the other way is to set the fan and heating pipes at the top of the box, and the hot air flow is brought into the box by the air duct. There are one air outlet and one air return opening on each of the left and right sides in the box to make the hot air flow circulate in the box in a large cycle.

[0006] In the above setting method, when no items are placed in the box of the aging oven, the thermal uniformity is normal. However, since the products need to be placed in multiple layers in the aging oven and there are obstructions in the up-down and front-back directions, the actual temperature difference is ±5°C, that is, the temperature difference is 10°C, as Figure 1 shown. The aging temperature is generally set between 60~90°C. For the products aged at different temperatures, the leakage current differences at different temperature differences can be clearly distinguished through leakage current tests. Therefore, temperature uniformity is crucial in OLED aging. Content of the Utility Model

[0007] The purpose of the utility model is to provide a constant-temperature aging oven to solve the problems in the prior art that the temperature uniformity in the box of the aging oven is poor when products are placed in multiple layers, and the aging effect is poor due to the long heating time.

[0008] The technical solution of the present utility model is as follows:

[0009] A constant-temperature aging oven, comprising a box body, a blower and heating tubes. A heating cavity is provided inside the box body. A cavity partition is horizontally arranged at the top of the heating cavity. The cavity partition divides the heating cavity into an upper heating cavity and a lower heating cavity. Both ends of the cavity partition respectively form an air outlet and an air return opening with the box body. Heating tubes and a blower are provided at the top end of the upper heating cavity, and the air outlet of the blower faces the heating tubes. It is characterized in that: it further comprises a circulating hot air flow duct structure, which includes an air outlet duct, an air return duct, a mesh-shaped partition, an air outlet opening, an air return opening and an air return baffle. An air outlet duct communicating with the air outlet and an air return duct communicating with the air return opening are respectively provided on both sides of the heating cavity, and both the air outlet duct and the air return duct are open ducts arranged from bottom to top. The air outlet duct is successively an upper-layer air outlet area, a middle-layer air outlet area and a lower-layer air outlet area from bottom to top. A mesh-shaped partition is provided in the lower-layer air outlet area. The middle-layer air outlet area and the upper-layer air outlet area are both air outlet openings. The air return duct is successively a lower-layer air return area, a middle-layer air return area and an upper-layer air return area from bottom to top. The upper-layer air return area is an air return opening. Air return baffles are provided in both the middle-layer air return area and the lower-layer air return area.

[0010] Furthermore, an air guiding plate is provided between the blower and the heating tubes. The air guiding plate is provided with an air guiding opening, and the air guiding opening communicates with the air outlet of the blower.

[0011] Furthermore, the heating tubes are connected to a temperature control device, and the temperature control device is arranged outside the box body.

[0012] Furthermore, several layers of placing plates are provided in the lower heating cavity.

[0013] Furthermore, the heating tubes are arranged on one side at the top end of the upper heating cavity.

[0014] Furthermore, a rolling door is provided on the side of the box body.

[0015] Furthermore, the lower-layer air outlet area, the middle-layer air outlet area and the upper-layer air outlet area have the same height, and the lower-layer air return area, the middle-layer air return area and the upper-layer air return area have the same height.

[0016] The beneficial effects of the present utility model are as follows: For this kind of constant-temperature aging oven, it can achieve a highly consistent temperature uniformity during the heating process, ensure the aging effect, can shorten the heating time and save energy consumption. Through the design of the circulating hot air flow duct, the high-speed circulation of the hot air flow is realized, so that the temperature inside the box body can be rapidly increased, and the long-time continuous heating time due to the local failure to reach the set value range during the heating process can be reduced. Since the heating process is shortened by more than 20%, and the temperature balance is strong, the process power does not need to be supplied frequently, and more than 30% of the electric energy can be saved. Description of the Drawings

[0017] Figure 1It is a schematic diagram of the temperature rise curves in each area of the existing aging oven;

[0018] Figure 2 It is a schematic structural diagram of the constant temperature aging oven according to the embodiment of the present invention;

[0019] Figure 3 It is a schematic structural diagram of the constant temperature aging oven after removing the cavity partition board in the embodiment;

[0020] Figure 4 It is a schematic structural diagram of the box body and the return air duct in the embodiment;

[0021] Figure 5 It is a schematic structural diagram of the box body and the return air duct after removing the cavity partition board in the embodiment;

[0022] Figure 6 It is a schematic diagram of the temperature rise curves in each area of the heating cavity in the embodiment;

[0023] Wherein: 1 - box body, 2 - fan, 3 - heating tube, 4 - cavity partition board, 5 - upper heating cavity, 6 - lower heating cavity, 7 - air outlet, 8 - air return opening, 9 - air outlet duct, 10 - air return duct, 11 - mesh-like partition board, 12 - air outlet opening, 13 - air return opening, 14 - air return baffle, 15 - air guiding plate, 16 - temperature control device, 17 - rolling shutter door;

[0024] 91 - lower air outlet area, 92 - middle air outlet area, 93 - upper air outlet area;

[0025] 101 - lower air return area, 102 - middle air return area, 103 - upper air return area. Detailed implementation manners

[0026] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0027] The embodiment provides a constant temperature aging oven, as Figure 2 、 Figure 3 and Figure 4, including a box body 1, a fan 2 and a heating pipe 3. A heating cavity is provided inside the box body 1. A cavity partition 4 is horizontally arranged at the top of the heating cavity. The cavity partition 4 divides the heating cavity into a heating upper cavity 5 and a heating lower cavity 6. Both ends of the cavity partition 4 respectively form an air outlet 7 and an air return opening 8 with the box body 1. The top end of the heating upper cavity 5 is provided with the heating pipe 3 and the fan 2, and the air outlet 7 of the fan 2 faces the heating pipe 3. It also includes a circulating hot air flow duct structure. The circulating hot air flow duct structure includes an air outlet duct 9, an air return duct 10, a mesh-shaped partition 11, an air outlet opening 12, an air return opening 13 and an air return baffle 14. An air outlet duct 9 communicating with the air outlet 7 and an air return duct 10 communicating with the air return opening 8 are respectively arranged on both sides of the heating cavity. Both the air outlet duct 9 and the air return duct 10 are open ducts arranged from bottom to top. The air outlet duct 9 is successively a lower-layer air outlet area 91, a middle-layer air outlet area 92 and an upper-layer air outlet area 93 from bottom to top. The lower-layer air outlet area 91 is provided with the mesh-shaped partition 11. Both the middle-layer air outlet area 92 and the upper-layer air outlet area 93 are air outlet openings 12. The air return duct 10 is successively a lower-layer air return area 101, a middle-layer air return area 102 and an upper-layer air return area 103 from bottom to top. The upper-layer air return area 103 is an air return opening 13. Both the middle-layer air return area 102 and the lower-layer air return area 101 are provided with the air return baffle 14.

[0028] This constant-temperature aging oven can achieve a highly consistent temperature uniformity during the heating process, ensure the aging effect, shorten the heating time and save energy consumption. Through the design of the circulating hot air flow duct, the high-speed circulation of the hot air flow is realized, so that the temperature inside the box body 1 rises rapidly, and the long-term continuous heating time due to the local temperature not reaching the set value range during the heating process is reduced. Since the heating process is shortened by more than 20% and the temperature balance is strong, the process power does not need to be supplied frequently, and more than 30% of the electric energy can be saved.

[0029] This constant-temperature aging oven, such as Figure 3 and Figure 5, an air guiding plate 15 is provided between the fan 2 and the heating pipe 3. The air guiding plate 15 is provided with an air guiding opening which is connected to the air outlet 7 of the fan 2, so as to separate the hot air outlet and return air through the air guiding plate 15. The fan 2 is arranged in the middle of the top of the upper heating cavity 5, and the air outlet 7 of the fan 2 faces the heating pipe 3, without hindrance to the air flow relay, playing a connecting role and better circulating and alternating the cold and hot air flows. The heating pipe 3 is arranged on one side of the top of the upper heating cavity 5 for rapid heating. The heating pipe 3 is arranged on one side to save energy consumption, and the heat is rapidly radiated and diffused. A plurality of layers of placing plates are arranged in the lower heating cavity 6 (the placing plates are not shown in the figure) for placing OLED organic light emitting diodes. A rolling door 17 is arranged on the side of the box body 1. The lower air outlet area 91, the middle air outlet area 92 and the upper air outlet area 93 have the same height, and the lower air return area 101, the middle air return area 102 and the upper air return area 103 have the same height. By removing the baffles in the middle air outlet area 92 and the upper air outlet area 93 of the air outlet duct 9, the hot air flow at the air outlet 7 is evenly diffused in the box body 1, and by blocking the middle air return area 102 and the lower air return area 101 of the air return duct 10, the hot air flow quickly circulates to the air return opening 13 of the upper air return area 103 and is quickly introduced into the air return port 8.

[0030] For this kind of constant temperature aging oven, the fan 2 is arranged at the center position of the top of the upper heating cavity 5. Taking the example that the air outlet duct 9 is arranged on the right side and the air return duct 10 is arranged on the left side inside the 5m³ aging oven, the motor power is not less than 0.75KW and 1400r / min (the air flow has large fluidity), and a 15KW heating pipe 3 is arranged on the right side of the heating cavity to achieve rapid heating. The heating pipe 3 is connected to the temperature control device 16, and the temperature control device 16 is arranged outside the box body 1. Due to the design of the air ducts on both sides inside the box body 1 and the combination of the power of the fan 2 and the rotation speed of the fan 2, the hot air flow enters the air outlet duct 9 through the air outlet 7, and then the hot air flow is sucked in through the air return opening 13 of the left air return duct 10, so as to realize that the hot air flow is quickly introduced from the lower right to the upper left to form a rapid circulation air duct. Such as Figure 6 , for this kind of constant temperature aging oven, after optimization, the temperature difference in each area is within ±2°C, and the heating curves are highly consistent.

[0031] For this kind of constant-temperature aging oven, the air outlet duct 9 and the air return duct 10 on both sides of the box body 1 are optimized in design by controlling the flow direction cycle and temperature change of the hot air flow through the mesh-shaped partition 11 and the air return baffle 14, that is, the heat flow of the air outlet duct 9 is large, and the fan 2 quickly overflows the hot air flow through the right mesh-shaped partition 11. At this time, the thermal radiation in the upper middle part has little influence, so there is a temperature difference of nearly 20 °C between the temperature at the bottom in the initial stage of heating. To improve the uniformity of the air outlet, a mesh-shaped partition 11 is set at the bottom end of the air outlet channel, and there is no partition design in the middle and upper layers, so that the hot air flow at the air outlet 7 can quickly diffuse into the entire box body 1. At the same time, the design of the air return duct 10 is optimized, that is, through the design of the air outlet 7, the hot air flow at the bottom is sufficient, the middle and lower layers of the air return duct 10 are blocked (no air return can be carried out), and the left upper air return baffle 14 is removed. The hot air flow at the bottom of the air outlet duct 9 is quickly lifted to the air return opening 13 at the top of the air return duct 10, so as to achieve the purpose of rapid circulation.

[0032] For this kind of constant-temperature aging oven, by optimizing the position settings of the fan 2 and the heating tube 3 and the design of the circulating hot air flow duct, the temperature uniformity during the heating process is highly consistent, the temperature difference inside the box body 1 can be reduced, the aging effect can be guaranteed, the heating time can be shortened, and the energy consumption can be saved. During the heating process, the thermostat outputs 100% power, and after reaching the set temperature, the power is output intermittently according to the temperature change. Since the heating process is shortened by more than 20% and the temperature balance is strong, the process power does not need to be supplied frequently, and more than 30% of the electric energy can be saved. This kind of constant-temperature aging oven is applicable to the OLED test aging in the manufacturing process of display panels, and is also universal in the fields of electronic manufacturing and large-scale baking.

[0033] The above is only the implementation mode of the present invention and is not used to limit the present invention. For those skilled in the art, various changes and modifications can be made to the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A constant temperature aging oven, comprising a box, a fan and a heating tube, wherein a heating cavity is arranged in the box, a cavity partition is arranged transversely on the top of the heating cavity, the cavity partition divides the heating cavity into an upper heating cavity and a lower heating cavity, the two ends of the cavity partition respectively form an air outlet and an air return port with the box, a heating tube and a fan are arranged on the top of the upper heating cavity, and the air outlet of the fan faces the heating tube, characterized in that: The heat release device further comprises a circulating hot air flow duct structure, which comprises an outlet duct, a return air duct, a mesh partition, an outlet opening, a return air opening and a return air baffle. An outlet duct connected to the outlet and a return air duct connected to the return air outlet are respectively provided on both sides of the heating chamber, and both the outlet duct and the return air duct are open ducts arranged from bottom to top. The outlet duct is sequentially divided into a lower outlet area, a middle outlet area and an upper outlet area from bottom to top, the lower outlet area is provided with a mesh partition, the middle outlet area and the upper outlet area are both outlet openings, the return air duct is sequentially divided into a lower return air area, a middle return air area and an upper return air area from bottom to top, the upper return air area is a return air opening, and the middle return air area and the lower return air area are both provided with return air baffles.

2. The constant temperature aging oven according to claim 1, characterized in that: An air induced plate is arranged between the fan and the heating pipe, the air induced plate is provided with an air induced port, and the air induced port is connected to the air outlet of the fan.

3. The constant temperature aging oven according to claim 1, characterized in that: The heating pipe is connected to a temperature control device, and the temperature control device is arranged outside the box.

4. The constant temperature aging oven according to any one of claims 1 to 3, characterized in that: A plurality of layers of storage plates are arranged in the lower heating chamber.

5. The constant temperature aging oven according to any one of claims 1 to 3, characterized in that: The heating tube is arranged on one side of the top end of the heating upper cavity.

6. The constant temperature aging oven according to any one of claims 1 to 3, characterized in that: A rolling door is provided on the side of the box.

7. The constant temperature aging oven according to any one of claims 1 to 3, characterized in that: The lower air outlet area, the middle air outlet area and the upper air outlet area have the same height, and the lower air return area, the middle air return area and the upper air return area have the same height.

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