A high and low temperature test chamber

Abstract

The application relates to the technical field of product quality detection equipment, in particular to a high-low temperature experiment box, which comprises a box body, an air supply channel, a shallow water tray, a flow guide wall, a tray body, an electric heating rod, a water inlet, a rotating shaft, a driving shaft and an embedded groove. The pure water in the shallow water tray which is detachably installed in the box body groove at the bottom of the air supply channel is gradually heated by the electric heating rod in the tray body, so that the water temperature is increased to be slightly higher than that of the high-temperature air in the air supply channel. On the basis of properly increasing the water vapor pressure, the high-temperature air in the air supply channel is used for convection, so that the water evaporation and diffusion in the shallow water tray are accelerated.

Description

Technical Field

[0001] This invention relates to the field of product quality testing equipment technology, specifically a high and low temperature test chamber. Background Technology

[0002] With the development of society, the use of various electronic and electrical materials, metals, rubber, and communication materials is becoming increasingly frequent, and their application in different scenarios and environments is also increasing. To ensure that manufactured products or materials can function properly under possible usage scenarios, especially extreme ones, it is necessary to test their performance and usage under these conditions in advance. High and low temperature test chambers are one type of quality testing equipment used for the aforementioned industrial products and materials.

[0003] High and low temperature test chambers, also known as high and low temperature alternating damp heat test chambers, are characterized by their ability to simulate various harsh environments, such as high temperature, low temperature, and humid conditions, to test the performance of products or materials. When using high and low temperature test chambers to simulate humidity environments, the mainstream humidification methods are steam humidification and shallow water pan humidification. Steam humidification has a short operating time and is simple and reliable to control, but because the steam used for humidification carries heat, it usually affects the ambient temperature, increasing the difficulty of temperature control. Shallow water pan humidification, on the other hand, involves installing a water pan with a heater in the test chamber to appropriately increase the water temperature. As the temperature of the water pan increases, the water vapor pressure on the surface increases, increasing the difference between the water vapor partial pressure and the water vapor partial pressure in the air inside the chamber, thus intensifying water vapor diffusion and convective mass exchange. This significantly reduces the superheat of the water vapor, thus not excessively increasing the heat inside the test chamber. This facilitates temperature control when simulating high temperature and high humidity environments, and also provides a high humidity environment when simulating low temperatures.

[0004] Shallow water tray humidification relies on the heat and humidity exchange at the boundary between the water surface and saturated air, causing water to evaporate into the air and increasing humidity. To improve humidification efficiency, the surface area of ​​the shallow water tray in the test chamber is usually large. However, the water surface area is still small relative to the space of the test chamber. Therefore, the diffusion and convection processes between the surface of the shallow water tray and the air are not very intense, limiting the rate of water evaporation and making it difficult to quickly increase the humidity of the air.

[0005] In view of this, in order to overcome the above-mentioned technical problems, the present invention proposes a high and low temperature test chamber. Summary of the Invention

[0006] To overcome the shortcomings of the existing technology, the technical solution adopted by the present invention to solve its technical problem is: a high and low temperature test chamber as described in the present invention, comprising a chamber body;

[0007] An air supply duct, which is used to deliver high-temperature or low-temperature gas into the chamber;

[0008] Also includes:

[0009] A shallow water tray is detachably installed in a recessed area at the bottom of the air supply duct; the top of the shallow water tray is flush with the bottom of the air supply duct.

[0010] A flow guide wall is located on the air supply channel at the front end of the shallow water tray. The flow guide wall is composed of a convex arc wall at the bottom and a concave arc wall at the top. The curvature of the convex arc wall and the concave arc wall of the flow guide wall is the same.

[0011] Preferably, the shallow water tray includes:

[0012] The disc body is a frustum-shaped design that is narrower at the bottom and wider at the top;

[0013] Multiple electric heating rods are installed in the same direction and evenly inside the plate to heat the pure water contained in the plate.

[0014] The water inlet is located at the top of the pan and is used to replenish the water in the pan when the water level is low.

[0015] Preferably, the heating rod has an elliptical cross-section and is rotatably connected to the disc body via a rotating shaft; one end of the rotating shaft extends out of the disc body and is rotatably and sealed to the disc body; the end of the rotating shaft extending out of the disc body is nested and connected to the drive shaft of the drive device inside the housing.

[0016] Preferably, the cross-section of the drive shaft is a regular polygon, and the end face of the rotating shaft near the drive shaft is provided with a similar regular polygonal fitting groove, through which the drive shaft is connected to the rotating shaft.

[0017] Preferably, the heating rod is provided with a sliding groove at one end near the driving device, and the end of the rotating shaft extending out of the disc is slidably connected in the sliding groove.

[0018] Preferably, a pressure airbag is placed between the sliding groove and the rotating shaft of the extended disc portion.

[0019] Preferably, a sealing mechanism is installed in the air supply channel above the disc body, the sealing mechanism comprising:

[0020] A drive cylinder, one end of which is fixedly connected to a mounting groove on the inner wall of the air supply channel;

[0021] The disc cover is a shallow frustum-shaped cover plate with the same slope as the disc body, and the disc cover is fixedly connected to the output end of the drive cylinder.

[0022] Preferably, the top surface of the cover is flush with the top of the air supply channel before the drive cylinder extends downward.

[0023] Preferably, the water inlet is a rectangular water inlet with a narrow width, and when the cover is moved to the bottom, its top is flush with the bottom of the air supply channel, and the side wall of the cover just closes the water inlet.

[0024] Preferably, the driving cylinder is a multi-stroke cylinder.

[0025] The beneficial effects of this invention are as follows:

[0026] 1. The purified water in the shallow water tray, which is detachably installed in the recess of the box at the bottom of the air supply channel, is gradually heated by the electric heating rod inside the tray to a temperature slightly higher than that of the high-temperature air in the air supply channel. By appropriately increasing the water-air pressure and taking advantage of the convection effect of the high-temperature air in the air supply channel, the evaporation and diffusion of water in the shallow water tray are accelerated.

[0027] 2. A water inlet is opened at the upper edge of the pan to maximize the minimum liquid level. If the water level in the shallow pan falls below the inlet, it can be replenished immediately through the inlet. The inlet is designed as a narrow rectangular inlet to limit the amount of water flowing into the shallow pan. This prevents a large amount of room temperature pure water from rushing in and causing the water temperature in the shallow pan to drop below the temperature of the air flowing above, thus ensuring the stability of the water vapor evaporation efficiency in the shallow pan. Attached Figure Description

[0028] The invention will now be further described with reference to the accompanying drawings.

[0029] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0030] Figure 2 This is a three-dimensional structural diagram of the air supply channel of the present invention;

[0031] Figure 3 This is a three-dimensional structural cross-sectional view of the air supply channel of the present invention in a humidification state;

[0032] Figure 4 This is a three-dimensional structural cross-sectional view of the air supply channel of the present invention when humidification is no longer performed.

[0033] Figure 5 This is a three-dimensional structural diagram of the shallow water tray of the present invention;

[0034] Figure 6 This is a top sectional view of the shallow water tray of the present invention.

[0035] In the diagram: 1. Box body; 2. Air supply channel; 3. Shallow water tray; 4. Guide wall; 5. Tray body; 6. Heating rod; 7. Water inlet; 8. Rotating shaft; 9. Drive shaft; 10. Fitting groove; 11. Sliding groove; 12. Pressure airbag; 13. Sealing mechanism; 14. Drive cylinder; 15. Tray cover. Detailed Implementation

[0036] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] like Figures 1 to 6 As shown, an embodiment of the present invention provides a high and low temperature test chamber, including a chamber body 1;

[0038] Air supply channel 2, which is used to deliver high temperature or low temperature gas into the housing 1;

[0039] Also includes:

[0040] Shallow water tray 3, which is detachably installed in the groove of the box 1 at the bottom of the air supply channel 2; the top of the shallow water tray 3 is flush with the bottom of the air supply channel 2 at the location therein;

[0041] The guide wall 4 is located on the air supply channel 2 at the front end of the shallow water tray 3. The guide wall 4 is composed of a convex arc wall at the bottom and a concave arc wall at the top. The curvature of the convex arc wall and the concave arc wall of the guide wall 4 is the same.

[0042] In one embodiment of the present invention, the shallow water tray 3 includes:

[0043] The disc body 5 is a frustum-shaped design that is narrower at the bottom and wider at the top;

[0044] Electric heating rod 6, there are multiple electric heating rods 6, which are installed in the same direction and evenly inside the plate body 5, for heating the pure water contained in the plate body 5;

[0045] Water inlet 7 is located at the upper end of the plate body 5 and is used to replenish the water in the plate body 5 in a timely manner when the water level is insufficient.

[0046] Taking the use of a high and low temperature test chamber to conduct extreme environmental tests on test samples under high temperature and high humidity conditions as an example, after placing the test sample inside the chamber 1 and closing the door, the staff adjusts the temperature and humidity parameters to the target values ​​via the control panel outside the chamber 1. The nickel-chromium alloy electric heating wire inside the chamber 1 then starts working, and the heat is transferred to the test chamber through the circulating fan along the air supply channel 2, causing the temperature inside the test chamber to rise rapidly. Simultaneously, the purified water in the shallow water tray 3, which is detachably installed in the groove of the chamber 1 at the bottom of the air supply channel 2, is gradually heated to a level slightly higher than the high-temperature air inside the air supply channel 2 by the heating rod 6 inside the tray 5. Based on an appropriate increase in water and air pressure, the temperature is further increased... The convection of high-temperature air within the air supply channel 2 accelerates the evaporation and diffusion of water in the shallow water tray 3. Furthermore, a guide wall 4, consisting of a convex arc wall at the bottom and a concave arc wall at the top, is designed on the air supply channel 2 at the front end of the shallow water tray 3. This guides the high-temperature air as it passes through the guide wall 4, causing it to tilt downwards in its forward direction. As a result, after passing through the guide wall 4, some of the air comes into contact with the water surface in the shallow water tray 3, carrying some water vapor into the housing 1. On the other hand, the downward-sloping airflow further causes the pure water in the shallow water tray 3 to fluctuate, thereby increasing the evaporation rate of the pure water. However, if the high-temperature airflow is fast, after it bends in direction after passing through the guide wall 4, it may blow the liquid water in the shallow water tray 3 away and fall into the air supply channel 2, which may easily lead to the growth of microbial contamination in the air supply channel 2. To address this, the tray body 5 of the shallow water tray 3 is designed as an inverted frustum-shaped structure that is narrow at the bottom and wide at the top. This ensures that even if the high-temperature air blows the liquid water in the shallow water tray 3, the liquid water will fall back on the inclined surface of the open tray body 5 and will not be blown into the air supply channel 2, thereby reducing the possibility of contamination of the air supply channel 2. On the other hand, the design of the tray body 5, which is narrow at the bottom and wide at the top, can also increase the surface area of ​​pure water exposed to the air within the same volume, thereby also increasing the water vapor evaporation rate of the shallow water tray 3 to a certain extent.

[0047] In one embodiment of the present invention, the heating rod 6 has an elliptical cross-section and is rotatably connected to the disc 5 via a rotating shaft 8; one end of the rotating shaft 8 extends out of the disc 5 and is rotatably and sealed to the disc 5; the end of the rotating shaft 8 extending out of the disc 5 is nested and connected to the drive shaft 9 of the drive device inside the housing 1.

[0048] In one embodiment of the present invention, the cross section of the drive shaft 9 is a regular polygon, and the same regular polygonal fitting groove 10 is provided on one end face of the rotating shaft 8 near the drive shaft 9. The drive shaft 9 is connected to the rotating shaft 8 through the fitting groove 10.

[0049] During operation, a regular polygonal fitting groove 10 is opened at one end of the rotating shaft 8 extending from the plate body 5. After the drive shaft 9 is inserted into the fitting groove 10, the drive shaft 9 can drive the rotating shaft 8 and the electric heating rod 6 connected to the rotating shaft 8 to rotate together in the plate body 5 under the action of the drive device. This causes the pure water in the entire shallow water plate 3 to be continuously disturbed by the rotation of the electric heating rod 6 and the rotating shaft 8, thereby increasing the evaporation rate of water vapor in the shallow water plate 3. In particular, the electric heating rod 6 is designed as an elliptical rod, so that it can more violently disturb the pure water in the shallow water plate 3 during the rotation with the rotating shaft 8, thereby further increasing the evaporation rate of the pure water in the shallow water plate 3, increasing the amount of water vapor evaporation in the shallow water plate 3 within a certain period of time, and achieving a rapid increase in humidity in the box body 1 under the action of high temperature airflow.

[0050] In one embodiment of the present invention, the electric heating rod 6 is provided with a sliding groove 11 at one end near the driving device, and the rotating shaft 8 extends out of the disc body 5 and is slidably connected in the sliding groove 11.

[0051] In one embodiment of the present invention, a pressure airbag 12 is placed between the sliding groove 11 and the rotating shaft 8 extending out of the disc body 5.

[0052] During operation, when conducting high and low temperature experiments, the evaporation rate of water vapor in the shallow water pan 3 should ideally match the water vapor produced per unit time with the gas flow rate through the air supply channel 2 during that time. If too little water vapor is produced, the humidity inside the chamber 1 will increase slowly; if too much is produced, the humidity will increase too quickly per unit time. The air circulation system inside the chamber 1 will then struggle to distribute the excess water vapor evenly within the chamber 1 in a short time, potentially causing some areas inside the chamber 1 to reach the set humidity requirement first, resulting in a false alarm from the humidity sensor inside the chamber 1. To address this, the rotating shaft 8 of the heating rod 6 near the drive device is configured to be slidably connected to the sliding groove 11 of the heating rod 6, and the sliding groove 11... An adjustable pressure airbag 12 is placed inside the chamber 1. This allows the number of heating rods 6 in the shallow water tray 3, the size of the tray 5 itself, and the compatibility between them to be adjusted according to the required temperature and humidity parameters. This can be achieved by compressing the pressure airbag 12 to remove part of the rotating shaft 8 and the heating rods 6 connected to it; or by adjusting the size of the tray 5 and then distributing the heating rods 6 accordingly. This ensures that the water vapor evaporation rate in the shallow water tray 3 within the air supply channel 2 is always compatible with the gas flow rate within the air supply channel 2, thus maintaining a high degree of consistency between the final humidity obtained in the chamber 1 and the humidity parameters set before the experiment.

[0053] In one embodiment of the present invention, a sealing mechanism 13 is installed in the air supply channel 2 above the disc body 5, and the sealing mechanism 13 includes:

[0054] A drive cylinder 14, one end of which is fixedly connected to a mounting groove on the inner wall of the air supply channel 2;

[0055] The disc cover 15 is a shallow frustum-shaped cover plate with the same slope as the disc body 5, and the disc cover 15 is fixedly connected to the output end of the drive cylinder 14.

[0056] In one embodiment of the present invention, when the drive cylinder 14 has not yet extended downwards, the top surface of the disc cover 15 is flush with the top of the air supply channel 2.

[0057] In one embodiment of the present invention, the water inlet 7 is a rectangular water inlet with a narrow width. When the cover 15 is moved to the lowest point, its top end is flush with the bottom end of the air supply channel 2, and the side wall of the cover 15 just closes the water inlet 7.

[0058] In one embodiment of the present invention, the drive cylinder 14 is a multi-stroke cylinder.

[0059] During operation, since the evaporation rate of water vapor in the shallow water tray 3 is closely related to the height of the water surface and the distance of the airflow in the air supply channel 2, a water inlet 7 is opened at the upper edge of the tray body 5 to maximize the minimum liquid level. Once the water level in the shallow water tray 3 is lower than the water inlet 7, it can be replenished immediately through the water inlet 7. The water inlet 7 is designed as a narrow rectangular water inlet 7 to limit the amount of water flowing into the shallow water tray 3, thus preventing a large amount of room temperature pure water from rushing in and causing the water temperature in the shallow water tray 3 to be lower than the temperature of the air flowing above, ensuring the stability of the water vapor evaporation efficiency of the shallow water tray 3. Once the humidity inside the chamber 1 reaches the set humidity, the shallow water tray 3 can be sealed in time by the sealing mechanism 13. Specifically, when the humidity sensor inside the chamber 1 detects that the humidity meets the set parameter value, the control system immediately turns off the heating rod 6 of the shallow water tray 3 and opens the drive cylinder 14, causing the cover 15 fixedly connected to the output end of the drive cylinder 14 to fall down, sealing the opening of the shallow water tray 3 and blocking the water inlet 7. This avoids the water vapor generated by the natural evaporation of pure water in the shallow water tray 3 under the action of air convection from affecting the humidity inside the chamber 1, thus improving the accuracy of the humidity inside the chamber 1. During the temperature and humidity changes throughout the experimental chamber, before the humidity reaches the target value, the top plane of the cover 15 is flush with the top of the air supply channel 2. Therefore, the height of the top of the shallow water tray 3 within the air supply channel 2 is lower than other locations due to the thickness of the cover 15. This allows the airflow in the air supply duct to approach the shallow water tray 3 more closely, further improving the evaporation efficiency of the shallow water tray 3. After the humidity reaches the target value, the cover 15 falls, sealing the shallow water tray 3. Its top is then flush with the bottom of the air supply channel 2, reducing the impact of the sealing mechanism 13 on the airflow within the air supply channel 2. Using a multi-stroke cylinder to drive the cover 15 up and down reduces the depth required for vertical installation of the sealing mechanism 13, lowering the volume occupied by the sealing mechanism 13 in the chamber 1. This provides more space for experiments within the chamber 1, improving the practicality of the device.

[0060] The foregoing has shown and described the basic principles, main features, and significant advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the specific embodiments described above. Without departing from the spirit and scope of the present invention, various changes and improvements may be made to adapt to different usage environments and customer needs, and all such changes and improvements fall within the protection scope of the present invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high and low temperature test chamber, comprising a chamber body (1); Air supply channel (2), the air supply channel (2) is used to send high temperature or low temperature gas into the box (1); Its features are, Also includes: Shallow water tray (3), which is detachably installed in the groove of the box (1) at the bottom of the air supply channel (2); The top of the shallow water tray (3) is flush with the bottom of the air supply channel (2); The guide wall (4) is located on the air supply channel (2) at the front end of the shallow water tray (3). The guide wall (4) is composed of a convex arc wall at the bottom and a concave arc wall at the top. The curvature of the convex arc wall and the concave arc wall of the guide wall (4) is the same. The shallow water tray (3) includes: The disc body (5) is a frustum-shaped design that is narrow at the bottom and wide at the top, which is used to reduce the possibility of the air supply channel (2) being contaminated, while increasing the surface area of ​​pure water exposed to the air. Electric heating rod (6), there are multiple electric heating rods (6) and they are installed in the same direction and evenly inside the plate (5) for heating the pure water contained in the plate (5); Water inlet (7) is located at the upper end of the plate (5) and is used to replenish the water in the plate (5) in a timely manner when the water volume is insufficient.

2. The high and low temperature test chamber according to claim 1, characterized in that: The electric heating rod (6) has an elliptical cross-section and is rotatably connected to the plate (5) via a rotating shaft (8); one end of the rotating shaft (8) extends out of the plate (5) and is rotatably and sealed to the plate (5); the end of the rotating shaft (8) extending out of the plate (5) is nested and connected to the drive shaft (9) of the drive device inside the housing (1).

3. A high and low temperature test chamber according to claim 2, characterized in that: The drive shaft (9) has a regular polygonal cross section. The rotating shaft (8) has a regular polygonal fitting groove (10) on one end face close to the drive shaft (9). The drive shaft (9) is connected to the rotating shaft (8) through the fitting groove (10).

4. A high and low temperature test chamber according to claim 3, characterized in that: The heating rod (6) has a sliding groove (11) at one end near the driving device, and the rotating shaft (8) extends out of the disc (5) and is slidably connected in the sliding groove (11).

5. A high and low temperature test chamber according to claim 4, characterized in that: A pressure airbag (12) is placed between the sliding groove (11) and the rotating shaft (8) of the part extending out of the disc (5).

6. A high and low temperature test chamber according to claim 1, characterized in that: A sealing mechanism (13) is installed in the air supply channel (2) above the plate body (5), and the sealing mechanism (13) includes: A drive cylinder (14) is fixedly connected at one end to the mounting groove on the inner wall of the air supply channel (2); The disc cover (15) is a shallow frustum-shaped cover plate with the same slope as the disc body (5), and the disc cover (15) is fixedly connected to the output end of the drive cylinder (14).

7. A high and low temperature test chamber according to claim 6, characterized in that: When the drive cylinder (14) has not yet extended downwards, the top surface of the cover (15) is flush with the top of the air supply channel (2).

8. A high and low temperature test chamber according to claim 7, characterized in that: The water inlet (7) is a narrow rectangular water inlet (7). When the cover (15) is moved to the bottom, its top is flush with the bottom of the air supply channel (2), and the side wall of the cover (15) just closes the water inlet (7).

9. A high and low temperature test chamber according to claim 8, characterized in that: The drive cylinder (14) is a multi-stroke cylinder.

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