Constant-temperature simulation box with circulating air flow

Abstract

The invention relates to the field of constant-temperature simulation boxes, in particular to a constant-temperature simulation box with circulating airflow, which comprises an outer box body and an inner box body, the inner box body is arranged in the outer box body, a mounting box and a speed regulation part are arranged in the inner box body, a fan is arranged in the mounting box, and the mounting box and the speed regulation part are connected through a communicating pipe. Wind power is provided for the speed regulating part through the mounting box; the speed adjusting piece comprises a fixing plate and a nozzle, and a plurality of ventilation holes are formed in the fixing plate. By designing a multi-stage adjustable speed regulation part structure and cooperating with the first adjusting head and the second adjusting head which are driven by the electric telescopic rod, automatic grading regulation and control of the airflow velocity are achieved, the air outlet hole diameter can be flexibly switched according to the characteristics of a test sample, high-speed direct blowing airflow can be provided for impact-resistant and non-thermosensitive samples, the heat exchange efficiency is improved, and the heat exchange efficiency is improved. The impact damage to fragile and thermosensitive samples caused by high-speed airflow can be avoided, and the test adaptation capability of equipment to samples with different characteristics is improved.

Description

Technical Field

[0001] This invention relates to the field of constant temperature simulation chambers, and more particularly to a constant temperature simulation chamber with circulating airflow. Background Technology

[0002] A circulating airflow constant temperature simulation chamber is an experimental device used to simulate various temperature environments. It tests the performance stability and reliability of products under different temperature conditions by precisely controlling the temperature and forcing airflow circulation.

[0003] Currently, the airflow circulation structure of existing constant temperature simulation chambers generally suffers from insufficient control capability. Most devices use a fixed fan speed and fixed outlet diameter for airflow supply, which can only achieve airflow circulation at a single velocity. They cannot adjust the airflow parameters according to the characteristics and size of the test sample. The outlet structure of these devices lacks a graded speed regulation design, and the airflow velocity is fixed when blowing directly. If the sample is impact-resistant or non-thermal sensitive, the insufficient flow velocity can lead to low heat exchange efficiency and poor temperature uniformity within the chamber. If the sample is fragile, thermally sensitive, or soft, the fixed high-speed direct airflow can easily cause impact damage to the sample, or even change the physical properties of the sample, resulting in distorted test results. Summary of the Invention

[0004] The purpose of this invention is to solve the problem of insufficient control capability of existing constant temperature simulation chambers, and to propose a constant temperature simulation chamber with circulating airflow.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A constant temperature simulation chamber with circulating airflow includes an outer chamber and an inner chamber. The inner chamber is disposed inside the outer chamber. An installation box and a speed regulating component are disposed inside the inner chamber. A fan is disposed inside the installation box. The installation box and the speed regulating component are connected by a connecting pipe, and the installation box provides airflow to the speed regulating component.

[0007] The speed regulating component includes a fixed plate and a nozzle. The fixed plate has multiple ventilation holes. The nozzle is mounted on the fixed plate and is connected to the ventilation holes. An adjusting head one and an adjusting head two are sequentially fitted onto the nozzle, and the air outlet diameters of the adjusting head one and the adjusting head two decrease sequentially.

[0008] The fixed plate is provided with multiple electric telescopic rods 1 and 2, and the ends of electric telescopic rods 1 and 2 are respectively provided with a movable base plate and a movable top plate. The adjusting head 1 and the adjusting head 2 are respectively provided on the movable base plate and the movable top plate. By moving the movable base plate and the movable top plate, the adjusting head 1 and the adjusting head 2 are sequentially fitted onto the nozzle.

[0009] Preferably, the inner box is provided with two symmetrically arranged flow guide partitions, which divide the inner box into flow cavity one and flow cavity two. The fixing plate is arranged between the two flow guide partitions, and the speed regulating component is arranged in flow cavity one.

[0010] Preferably, the flow cavity is provided with three lead screws and one rotating rod, and the three lead screws and one rotating rod are arranged in a rectangle. Nuts are sleeved on the outer walls of the three lead screws, and sprockets are provided on the outer walls of the nuts. Synchronizing elements are provided on the outer walls of the rotating rod, and the sprockets are also sleeved on the outer walls of the synchronizing elements. A chain is provided on the outer walls of the four sprockets. The synchronizing elements drive the sprockets on the outer walls to rotate, and the lead screws and rotating rods rotate synchronously under the drive of the chain.

[0011] Preferably, the synchronizing element includes a rotating sleeve and a rotating bushing. The rotating bushing is rotatably disposed inside the rotating sleeve and disposed on the outer wall of the rotating rod. A limiting groove is formed at the upper end of the rotating bushing. A movable ring is disposed on the rotating sleeve, and a limiting plate is disposed on the movable ring. The rotating sleeve and the rotating bushing rotate synchronously by means of the limiting plate being disposed in the limiting groove.

[0012] Preferably, the flow cavity is further provided with a plurality of vertically parallel placement plates, each placement plate having a U-shaped placement groove, and the nut and the rotating sleeve being rotatably disposed within the placement groove.

[0013] Preferably, the second circulation cavity is provided with a plurality of second placement plates, each second placement plate has a mounting frame on its side, the inner box has a mounting groove for mounting the mounting frame, the inner box has a plurality of through holes communicating with the second circulation cavity, each through hole has a mounting block, the mounting block is connected to a fixing bolt by a thread, and the second placement plate has a threaded hole at its side relative to the fixing bolt position, the fixing bolt is screwed into the threaded hole to limit the position of the second placement plate.

[0014] Preferably, the rotating sleeve is provided with two symmetrically arranged mounting plates, the mounting plates are provided with elastic locking blocks, and the moving ring is disposed between the two mounting plates.

[0015] Preferably, the mounting box is provided with multiple flow-limiting ports at both ends, and two inclined air guide plates are also provided at both ends of the mounting box, with the included angle between the air guide plates and the mounting box being 40°-50°. The air guided by the air guide plates flows from the flow-limiting ports into the mounting box.

[0016] Preferably, the outer casing is provided with a door, and a heat exchange box is also provided between the outer casing and the inner casing, with the heat exchange box located on the inner casing.

[0017] Preferably, the fixed plate is provided with a plurality of guide posts, and the movable base plate and the movable top plate are slidably disposed on the guide posts.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. This invention, through the design of a multi-level adjustable speed control component structure, combined with the electric telescopic rod-driven adjustment head one and adjustment head two, realizes the automated graded control of airflow velocity. It can flexibly switch the air outlet diameter according to the characteristics of the test sample, which can provide high-speed direct airflow for impact-resistant and non-heat-sensitive samples to improve heat exchange efficiency, and also avoid impact damage to fragile and heat-sensitive samples caused by high-speed airflow, thereby improving the equipment's adaptability to testing samples with different characteristics.

[0020] 2. This invention divides the interior of the chamber into a direct-flow chamber 1 and an indirect-flow chamber 2 using a flow guide partition, enabling zoned constant-temperature testing of samples with different characteristics. Simultaneously, the first flow chamber is equipped with a synchronously adjustable placement plate 1, and the second flow chamber is equipped with a placement plate 2 with freely adjustable spacing. This allows for flexible adjustment of the placement spacing according to the height and size of the samples, avoiding airflow stagnation caused by overly dense sample placement, ensuring temperature uniformity within the chamber, and improving the utilization rate of sample placement space and testing efficiency.

[0021] 3. The combination of the air guide plate and the flow restrictor in this invention achieves smooth airflow return and pressure stabilization, effectively reducing eddies and stagnation in the airflow circulation process and improving airflow circulation efficiency. At the same time, the double-layer box structure combined with the closed-loop temperature control design of the heat exchange box further reduces heat exchange between the inside and outside of the box, ensuring the accuracy and stability of constant temperature simulation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a constant temperature simulation chamber with circulating airflow proposed in this invention;

[0023] Figure 2 A schematic diagram of the inner casing and heat exchange box structure;

[0024] Figure 3 Schematic diagrams of flow cavity one and flow cavity two;

[0025] Figure 4 This is a schematic diagram of the inner casing and mounting box structure;

[0026] Figure 5 This is a schematic diagram of the flow restriction port and air guide plate structure;

[0027] Figure 6 This is a schematic diagram of the connection between the sprocket and the chain;

[0028] Figure 7 This is a schematic diagram showing the connection between the rotating bushing and the limiting plate;

[0029] Figure 8 An exploded view of the synchronizing element;

[0030] Figure 9 This is a schematic diagram showing the connection between the fixing plate and the guide post;

[0031] Figure 10 Schematic diagrams of electric telescopic pole one and electric telescopic pole two;

[0032] Figure 11 This is a schematic diagram of the fixed plate and ventilation hole structure;

[0033] Figure 12 for Figure 11 Enlarged view of a portion of region A in the middle;

[0034] Figure 13 This is a schematic diagram of the flow guide partition structure;

[0035] Figure 14 for Figure 13 Enlarged view of a portion of region B in the middle.

[0036] In the diagram: 1. Outer casing; 2. Door; 3. Inner casing; 4. Heat exchanger; 5. Flow guide plate; 501. Flow chamber one; 502. Flow chamber two; 6. Mounting box; 601. Flow limiting port; 602. Air guide plate; 7. Placement plate one; 701. Placement slot; 702. Lead screw; 703. Rotating rod; 704. Sprocket; 705. Chain; 8. Rotating sleeve; 801. Rotating bushing; 802. Limiting groove; 803. Guide rod; 804. Moving ring; 805. 806. Limiting plate; 807. Mounting plate; 808. Elastic locking block; 909. Fixing plate; 9001. Guide column; 902. Movable base plate; 903. Movable top plate; 904. Electric telescopic rod one; 905. Electric telescopic rod two; 906. Nozzle; 907. Ventilation hole; 908. Adjusting head one; 909. Adjusting head two; 10. Collection plate; 1001. Mounting block; 1002. Fixing bolt; 1003. Mounting frame; 1004. Mounting groove; 1005. Placement plate two. Detailed Implementation

[0037] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0038] Reference Figures 1-14A constant temperature simulation chamber with circulating airflow includes an outer chamber 1 and an inner chamber 3. The inner chamber 3 is fixedly installed in the center of the outer chamber 1. The outer chamber 1 is made of cold-rolled steel plate with powder coating, which has good protection and sealing performance. The inner chamber 3 is made of SUS304 stainless steel, which is corrosion resistant and easy to clean, and can be adapted to the constant temperature testing environment of various samples. An installation gap is reserved between the outer chamber 1 and the inner chamber 3 to provide installation space for subsequent heat exchange, wiring and other structures, while reducing heat exchange between the inside and outside of the chamber and improving the constant temperature effect.

[0039] The inner casing 3 houses a mounting box 6 and a speed regulating component. The mounting box 6 is a rectangular hollow metal structure, inside which a centrifugal fan is fixedly installed. This fan provides a continuous power source for the circulating airflow of the entire equipment. The air outlet of the mounting box 6 is connected to the speed regulating component through multiple sets of flexible sealed connecting pipes. The connecting pipes are made of temperature-resistant and wear-resistant silicone material, which can not only achieve stable airflow transmission but also buffer the vibration generated during fan operation, preventing vibration from affecting the stability of airflow transmission. Ultimately, the airflow generated by the fan in the mounting box 6 is stably provided to the speed regulating component through the connecting pipes, laying the power foundation for the airflow circulation within the inner casing 3. The speed regulating component includes a fixing plate 9 and nozzles 906. The fixing plate 9 is a rectangular plate made of stainless steel, vertically fixed inside the inner casing 3. Its surface is perpendicular to the length direction of the inner casing 3, which can effectively guide and separate the airflow. Multiple circular ventilation holes 907 are evenly and through the fixing plate 9, arranged in a matrix, providing a smooth and uniform channel for airflow. To prevent airflow deviation due to uneven arrangement of ventilation holes 907, multiple nozzles 906 are welded and fixed to one side of the fixed plate 9, with the internal cavity of the nozzle 906 connected to the ventilation hole 907. The nozzle 906 is a rigid metal tubular structure with its axis perpendicular to the surface of the fixed plate 9, ensuring that the airflow enters the nozzle 906 from the ventilation hole 907 and blows out in a straight direction. Adjusting head 1 908 and adjusting head 2 909 are movably and sequentially fitted onto the nozzle 906. Adjusting head 1 908 Both the regulating head 908 and the regulating head 909 are stepped tubular structures with openings at both ends, and the outlet diameters of the two decrease sequentially. The inner diameter of the air inlet end of the regulating head 908 is matched with the outer diameter of the nozzle 906, and the inner diameter of the air inlet end of the regulating head 909 is matched with the outer diameter of the regulating head 908, ensuring that the two can be tightly fitted onto the nozzle 906 in sequence. The airflow velocity is controlled by changing the outlet diameter. The smaller the diameter, the faster the airflow velocity, and vice versa, thus meeting the airflow velocity requirements of different samples.

[0040] Multiple electric telescopic rods 904 and 905 are fixedly installed on the fixed plate 9. Both electric telescopic rods 904 and 905 are arranged vertically along the surface of the fixed plate 9 and symmetrically on both sides of the nozzle 906. A movable base plate 902 and a movable top plate 903 are fixedly connected to the ends of electric telescopic rods 904 and 905, respectively. Both the movable base plate 902 and the movable top plate 903 are thin metal plates parallel to the fixed plate 9. Adjusting heads 908 and 909 are fixedly installed on the upper surface of the movable base plate 902 and the lower surface of the movable top plate 903, respectively. Multiple cylindrical guide posts 901 are also fixedly installed on the fixed plate 9. The guide posts 901 extend vertically along the surface of the fixed plate 9. The movable base plate 902 and the movable top plate 905 are fixedly connected to the nozzle 906. Each of the three plates has a guide hole adapted to the guide post 901. The movable base plate 902 and the movable top plate 903 are slidably mounted on the guide post 901 through the guide hole. The guide post 901 can provide guidance for the movement of the movable base plate 902 and the movable top plate 903, preventing them from deviating under the drive of the electric telescopic rod, and ensuring that the first adjustment head 908 and the second adjustment head 909 can be fitted onto the nozzle 906. Through the extension and retraction drive of the first electric telescopic rod 904 and the second electric telescopic rod 905, the movable base plate 902 and the movable top plate 903 are driven to move in a straight line along the guide post 901 towards or away from the fixed plate 9, thereby allowing the first adjustment head 908 and the second adjustment head 909 to be fitted onto the nozzle 906 or separated from the nozzle 906 in sequence, realizing multi-stage switching of the air outlet diameter, thereby completing the adjustment of the airflow velocity.

[0041] Two symmetrically arranged flow-guiding partition plates 5 are fixedly installed inside the inner chamber 3. The flow-guiding partition plates 5 are made of thin stainless steel plates, and their height and length are adapted to the internal height and length of the inner chamber 3, respectively. The plate surface is parallel to the plate surface of the fixed plate 9. The two flow-guiding partition plates 5 divide the internal space of the inner chamber 3 into a central flow cavity 1 501 and two symmetrical flow cavities 2 502. The fixed plate 9 is located between the two flow-guiding partition plates 5, and the speed regulating component is installed entirely within the flow cavity 1 501. The flow cavity 1 501 serves as a direct airflow circulation zone, suitable for constant temperature testing of impact-resistant and non-thermal-sensitive samples. The two flow cavities 2 502 on both sides serve as indirect airflow circulation zones, suitable for constant temperature testing of fragile, thermally sensitive samples that are easily affected by airflow impact. The edges of the flow-guiding partition plates 5 are rounded and chamfered to effectively reduce airflow stagnation and eddies at the corners of the flow cavities and improve airflow. To ensure smooth circulation and uniform temperature within the chamber, three lead screws 702 and one rotating rod 703 are installed in the flow chamber 501. These three lead screws 702 and one rotating rod 703 are vertically arranged along the height of the inner chamber 3 and are rectangularly positioned at the four corners of the flow chamber 501. Nuts are threaded onto the outer walls of the three lead screws 702, and sprockets 704 are fixedly fitted onto the outer walls of the nuts. A synchronizing element is installed on the outer wall of the rotating rod 703, and sprockets 704 are also fixedly fitted onto the outer wall of this synchronizing element. A closed chain 705 is fitted onto the outer walls of all four sprockets 704. The chain 705 meshes with all four sprockets 704. The synchronizing element drives the sprockets 704 on its outer wall to rotate, and under the transmission action of the chain 705, the four sprockets 704 rotate synchronously, thereby driving the three lead screws 702 to rotate synchronously, ensuring the smooth lifting and lowering of the subsequent sample placement plate.

[0042] The synchronizing element includes a rotating sleeve 8 and a rotating bushing 801. The rotating bushing 801 is rotatably mounted inside the rotating sleeve 8 via bearings, and its inner wall is fixedly connected to the outer wall of the rotating rod 703, allowing it to rotate synchronously with the rotating rod 703. Multiple limiting grooves 802 are formed along the circumference of the upper outer wall of the rotating bushing 801. A movable ring 804 is slidably mounted on the rotating sleeve 8. A limiting plate 805, adapted to the limiting grooves 802, is fixedly mounted on the inner wall of the movable ring 804, allowing the limiting plate 805 to be embedded within the limiting grooves 802. The limiting plate 805 is set in the limiting groove 802 to enable the rotating sleeve 8 and the rotating shaft sleeve 801 to rotate synchronously, thus completing the power transmission. Four guide rods 803 are also fixedly installed on the rotating sleeve 8, which are evenly arranged around its circumference. The guide rods 803 extend along the axis of the rotating sleeve 8. The moving ring 804 is slidably set on the outer wall of the guide rods 803. The guide rods 803 prevent the moving ring 804 from rotating relative to the rotating sleeve 8, ensuring that the limiting plate 805 can be embedded in the limiting groove 802 and ensuring the stability of power transmission.

[0043] The flow cavity 501 is also equipped with multiple vertically parallel placement plates 7. Each placement plate 7 has a placement groove 701 with a U-shaped structure. Nuts on three lead screws 702 and rotating sleeves 8 are rotatably mounted in the placement grooves 701. When the lead screws 702 rotate, the nuts can move up and down along the axis of the lead screws 702, thereby driving the placement plates 7 to move up and down synchronously. This allows for free adjustment of the distance between two adjacent placement plates 7, adapting to the placement needs of samples of different heights and sizes. Two symmetrically arranged mounting plates 806 are fixedly mounted on the rotating sleeves 8. Elastic blocks 807 are fixedly mounted on the mounting plates 806. The elastic blocks 807 are made of rubber elastic structure and have good elastic limiting ability. The moving ring 804 is located between the two mounting plates 806. The elastic blocks 807 limit the moving ring 804 to prevent it from moving down when not in operation, thus avoiding accidental synchronous rotation of the rotating sleeves 8 and rotating bushings 801 and ensuring the stability of the position of the placement plates 7.

[0044] Multiple placement plates 1005 are provided inside the flow cavity 2 502. Mounting frames 1003 are fixedly installed on both end faces of the placement plates 1005. Mounting slots 1004 for mounting frames 1003 are provided on both inner walls of the inner box 3 along their height direction. Multiple through holes communicating with the flow cavity 2 502 are provided on the inner box 3. Mounting blocks 1001 are fixedly installed in the through holes. Fixing bolts 1002 are threadedly connected to the mounting blocks 1001. Threaded holes are provided on the side ends of the placement plates 1005 at the positions of the fixing bolts 1002. The threaded holes are adapted to the fixing bolts 1002. The placement plates 1005 are limited and fixed by screwing the fixing bolts 1002 into the threaded holes.

[0045] A collection plate 10 is fixedly installed on the mounting block 1001, and the collection plate 10 is located on the outer wall of the inner casing 3. Multiple flow-limiting ports 601 are provided at both ends of the mounting box 6. The flow-limiting ports 601 are rectangular through holes arranged in a matrix on the end face of the mounting box 6. They can limit and stabilize the return airflow, preventing the return airflow velocity from being too fast or too slow, thus affecting the normal operation of the fan and ensuring the service life of the fan. Two inclined air guide plates 602 are also provided at each end of the mounting box 6, with an angle of 45° between the air guide plates 602 and the mounting box 6. The airflow is guided by the 45° inclined air guide plates 602 to the flow-limiting ports 601, allowing the airflow to enter the flow-limiting ports 601 at a 90° refraction angle. The air guide plates 602 are made of stainless steel. Through the arc-shaped guiding effect of the air guide plates 602, the airflow that has completed heat exchange in the inner casing 3 is guided to the flow-limiting ports 601, allowing the airflow to flow from the limited... The flow outlet 601 flows into the installation box 6. The outer box 1 is hinged to a door 2, which is equipped with a sealing strip and a door lock to ensure the airtightness of the outer box 1 after the door 2 is closed, reducing the heat and airflow exchange between the inside and outside of the box and further improving the constant temperature effect. A heat exchange box 4 is also installed in the installation gap between the outer box 1 and the inner box 3, and the heat exchange box 4 is fixedly installed on the outer wall of the inner box 3. The heat exchange box 4 is a mature constant temperature heat exchange structure in the existing technology. It integrates a heater, an evaporator and a high-precision temperature sensor, which can accurately heat or cool the circulating airflow so that the airflow reaches the preset constant temperature when it enters the inner box 3. At the same time, the temperature sensor can monitor the airflow temperature in real time and feed the temperature signal back to the control system to realize closed-loop temperature control, ensuring the accuracy and stability of the internal ambient temperature of the inner box 3 and meeting the requirements of high-precision constant temperature testing.

[0046] The fixed plate 9 is provided with multiple guide posts 901. The movable base plate 902 and the movable top plate 903 are slidably mounted on the guide posts 901. The setting of the guide posts 901 can effectively ensure the linearity of the movement of the movable base plate 902 and the movable top plate 903, avoid the offset of the first adjustment head 908 and the second adjustment head 909 during the installation process, ensure the accuracy of the air outlet diameter adjustment, and thus ensure the stability of the airflow velocity control.

[0047] It should be noted that the specific models and specifications of the electrical components used in this invention, such as the centrifugal fan, electric telescopic rod 904, electric telescopic rod 905, and heat exchange box 4, need to be selected and determined according to the actual specifications of the device. The specific selection and calculation methods adopt existing technology in this field, so they will not be elaborated here.

[0048] The functional principle of this invention can be explained through the following operational methods:

[0049] Before conducting the constant temperature test on the samples, first open the door 2 on the outer chamber 1, and place the samples in sections according to their characteristics. Place the impact-resistant, non-heat-sensitive, and less susceptible to direct airflow on the placement plate 7 in the middle flow chamber 501, and place the fragile, heat-sensitive, and easily affected by airflow on the placement plates 1005 in the two side flow chambers 502. After placement, adjust the distance between the placement plate 7 and the placement plate 1005 according to the height and size of the samples.

[0050] For placement plate 7, by manually pressing the moving ring 804, the moving ring 804 moves downward against the limiting force of the elastic block 807. As the moving ring 804 continues to move downward, the limiting plate 805 moves into the limiting groove 802. At this time, the rotating rod 703 and the rotating sleeve 8 are connected by power. Manually rotating the rotating rod 703 causes the rotating bushing 801 to drive the limiting plate 805 and the moving ring 804 to rotate. The moving ring 804 drives the rotating sleeve 8 to rotate synchronously through the guide rod 803. The rotating sleeve 8 drives the sprocket 704 on the outer wall to rotate. Under the meshing transmission of the chain 705, the remaining three sprockets 704 rotate synchronously, thereby causing the nut to rise and fall along the axis of the screw 702, driving the placement plate 7 to move synchronously, adjusting the distance between two adjacent placement plates 7 until it matches the size of the sample.

[0051] After adjustment, push the moving ring 804 upward to reset it and complete the limit under the action of the elastic block 807, thereby releasing the power connection between the rotating rod 703 and the rotating sleeve 8 and preventing the placement plate 7 from shifting during equipment operation.

[0052] For placement plate 2 1005, by loosening the fixing bolt 1002, the fixing bolt 1002 is separated from the threaded hole on placement plate 2 1005, releasing the limitation on placement plate 2 1005. Then, the fixing bolt 1002 is screwed back into the threaded hole to limit and fix placement plate 2 1005 in the changed position, completing the adjustment of the position between two adjacent placement plates 2 1005 to adapt to the sample placement requirements of different sizes.

[0053] After the samples are placed and the spacing is adjusted, close the chamber door 2 and ensure a good seal. Start the equipment, and the fan inside the installation chamber 6 will start running. The generated airflow is transmitted through the connecting pipe to the ventilation hole 907 of the fixed plate 9, and then enters the nozzle 906 from the ventilation hole 907. After passing through the nozzle 906, the airflow is blown directionally onto the impact-resistant items on the placement plate 7, realizing direct airflow circulation and heat exchange. Subsequently, the airflow passes through the arc-shaped guide plate 5 and enters the flow chamber 502, allowing the circulating air to slowly flow over the surface of fragile or heat-sensitive samples on the placement plate 1005, realizing indirect airflow circulation and heat exchange. This avoids direct airflow from causing impact damage to these samples, ensuring the integrity of the samples and the test results.

[0054] After heat exchange, the airflow is guided to the flow restriction port 601 by the air guide plates 602 at both ends of the mounting box 6. After the flow restriction port 601 limits the flow and stabilizes the pressure, it enters the mounting box 6 and forms a continuous closed-loop airflow circulation through the fan to ensure the uniformity and stability of the internal temperature of the inner box 3.

[0055] When changing to different impact-resistant items and needing to adjust the airflow speed, the control system drives the extension and retraction of electric telescopic rod 1 904 and electric telescopic rod 2 905, causing the moving base plate 902 and moving top plate 903 to move along the guide post 901 towards the fixed plate 9. Adjusting head 1 908 and adjusting head 2 909 are then sequentially fitted onto the nozzle 906. By changing the orifice diameter of the circulating airflow outlet, the airflow speed can be controlled. The smaller the orifice diameter, the faster the airflow speed when it flows out. The appropriate airflow speed can be flexibly adjusted according to the actual testing requirements of the sample to adapt to the constant temperature testing requirements of different items.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A constant temperature simulation chamber with circulating airflow, characterized in that, It includes an outer casing (1) and an inner casing (3). The inner casing (3) is located inside the outer casing (1). The inner casing (3) is equipped with an installation box (6) and a speed regulating component. The installation box (6) is equipped with a fan. The installation box (6) and the speed regulating component are connected by a connecting pipe. The installation box (6) provides airflow to the speed regulating component. The speed regulating component includes a fixed plate (9) and a nozzle (906). The fixed plate (9) has multiple ventilation holes (907). The nozzle (906) is mounted on the fixed plate (9) and connected to the ventilation holes (907). An adjusting head one (908) and an adjusting head two (909) are sequentially mounted on the nozzle (906), and the air outlet diameters of the adjusting head one (908) and the adjusting head two (909) decrease sequentially. The fixed plate (9) is provided with a plurality of electric telescopic rods one (904) and electric telescopic rod two (905), and the ends of electric telescopic rods one (904) and electric telescopic rod two (905) are respectively provided with a movable base plate (902) and a movable top plate (903). The adjusting head one (908) and the adjusting head two (909) are respectively provided on the movable base plate (902) and the movable top plate (903). By moving the movable base plate (902) and the movable top plate (903), the adjusting head one (908) and the adjusting head two (909) are sequentially sleeved on the nozzle (906).

2. The constant temperature simulation chamber with circulating airflow according to claim 1, characterized in that, The inner box (3) is provided with two symmetrically arranged flow guide partitions (5), which divide the inner box (3) into flow cavity one (501) and flow cavity two (502). The fixing plate (9) is arranged between the two flow guide partitions (5), and the speed regulating component is arranged in flow cavity one (501).

3. A constant temperature simulation chamber with circulating airflow according to claim 2, characterized in that, The flow cavity 1 (501) is provided with three lead screws (702) and one rotating rod (703), and the three lead screws (702) and one rotating rod (703) are arranged in a rectangle. Nuts are sleeved on the outer walls of the three lead screws (702), and sprockets (704) are provided on the outer walls of the nuts. Synchronizing elements are provided on the outer walls of the rotating rod (703), and the sprockets (704) are also sleeved on the outer walls of the synchronizing elements. A chain (705) is provided on the outer walls of the four sprockets (704). The synchronizing elements drive the sprockets (704) on the outer walls to rotate, and the lead screws (702) and rotating rods (703) rotate synchronously under the drive of the chain (705).

4. A constant temperature simulation chamber with circulating airflow according to claim 3, characterized in that, The synchronizing element includes a rotating sleeve (8) and a rotating bushing (801). The rotating bushing (801) is rotatably disposed inside the rotating sleeve (8) and disposed on the outer wall of the rotating rod (703). A limiting groove (802) is provided at the upper end of the rotating bushing (801). A moving ring (804) is provided on the rotating sleeve (8), and a limiting plate (805) is provided on the moving ring (804). The rotating sleeve (8) and the rotating bushing (801) rotate synchronously by the limiting plate (805) being disposed in the limiting groove (802).

5. A constant temperature simulation chamber with circulating airflow according to claim 4, characterized in that, The flow cavity (501) is also provided with a plurality of vertically parallel placement plates (7), and the placement plates (7) are provided with a placement groove (701) in a U-shape. The nut and the rotating sleeve (8) are rotatably disposed in the placement groove (701).

6. A constant temperature simulation chamber with circulating airflow according to claim 2, characterized in that, The second circulation cavity (502) is provided with a plurality of second placement plates (1005). The second placement plate (1005) is provided with a mounting frame (1003) on its side. The inner box (3) is provided with a mounting groove (1004) for placing the mounting frame (1003). The inner box (3) is provided with a plurality of through holes that communicate with the second circulation cavity (502). The through holes are provided with mounting blocks (1001). The mounting blocks (1001) are connected to fixing bolts (1002) by threads. The second placement plate (1005) is provided with a threaded hole at the position of the fixing bolt (1002) on its side. The fixing bolt (1002) is screwed into the threaded hole to limit the second placement plate (1005).

7. A constant temperature simulation chamber with circulating airflow according to claim 4, characterized in that, The rotating sleeve (8) is provided with two symmetrically arranged mounting plates (806), and the mounting plates (806) are provided with elastic locking blocks (807). The moving ring (804) is arranged between the two mounting plates (806).

8. A constant temperature simulation chamber with circulating airflow according to claim 1, characterized in that, The mounting box (6) is provided with multiple flow-limiting ports (601) at both ends. The mounting box (6) is also provided with two inclined air guide plates (602) at both ends. The included angle between the air guide plates (602) and the mounting box (6) is 40°-50°. The air guided by the air guide plates (602) flows from the flow-limiting ports (601) into the mounting box (6).

9. A constant temperature simulation chamber with circulating airflow according to claim 1, characterized in that, The outer casing (1) is provided with a door (2), and a heat exchange box (4) is provided between the outer casing (1) and the inner casing (3), and the heat exchange box (4) is provided on the inner casing (3).

10. A constant temperature simulation chamber with circulating airflow according to claim 1, characterized in that, The fixed plate (9) is provided with a plurality of guide posts (901), and the movable base plate (902) and the movable top plate (903) are slidably disposed on the guide posts (901).

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