A high-low temperature test chamber for improving temperature uniformity

Abstract

This application provides a high and low temperature test chamber for improving temperature uniformity, relating to the field of high and low temperature testing equipment. It includes a chamber body and a circulation device, the circulation device comprising a base and a circulation mechanism. The circulation mechanism includes a limiting ring and several bottom pipes arranged radially along the limiting ring; an air inlet pipe is rotatably connected to the air outlet of the chamber body, and a top pipe corresponding to the bottom pipes is connected to the air inlet pipe; the bottom pipes and top pipes are connected by a connecting pipe, which contains rotating blades. Airflow drives the rotating blades to rotate, causing the circulation mechanism to rotate around the base. The inner wall of the connecting pipe has a spiral groove structure. Airflow, guided by the spiral groove, generates an axial force, driving the connecting pipe to extend and retract, and under the action of the connecting elastic element, forms a reciprocating motion, achieving spatial sweeping airflow over the test product. This application utilizes the kinetic energy of the airflow itself to achieve dynamic airflow without motor drive, effectively eliminating temperature dead zones, significantly improving temperature uniformity within the chamber, and featuring a simple structure, low energy consumption, and high reliability.

Description

Technical Field

[0001] This application relates to the field of high and low temperature testing equipment, and in particular to a high and low temperature test chamber for improving temperature uniformity. Background Technology

[0002] High and low temperature test chambers are widely used for environmental reliability testing of electronic products, materials and components. They simulate the working state of products under different temperature environments by precisely controlling the temperature inside the chamber.

[0003] Existing high and low temperature test chambers typically achieve temperature regulation and uniform distribution by incorporating heating, cooling, and circulating fans to create air circulation within the chamber. To further improve airflow distribution, some test chambers also feature internal baffles or multiple air outlets to guide the airflow direction.

[0004] However, in actual use, due to the limited internal space of the chamber and the diverse arrangement of test products, the airflow is easily obstructed during the flow process, resulting in low airflow velocity in some areas or the formation of stagnant zones, thus creating temperature dead zones and causing uneven temperature distribution inside the chamber, affecting the accuracy and consistency of the test results.

[0005] In addition, the airflow circulation structures in existing technologies are mostly fixed structures, meaning that the air outlet direction and range of action are relatively fixed. Even if the fan power is increased or the number of air outlets is adjusted, the airflow distribution can only be improved to a certain extent, and it is still difficult to achieve full coverage of the entire test space.

[0006] Some technical solutions introduce rotating or oscillating structures to change the direction of airflow. However, such structures usually rely on independent driving devices, are complex, consume a lot of energy, and mostly only achieve movement in a single direction. The airflow disturbance is relatively simple and still cannot effectively eliminate the temperature stratification phenomenon in the space.

[0007] Meanwhile, existing airflow channels mostly employ smooth or simple guiding structures, whose main function is to reduce flow resistance or guide the direction of airflow. They fail to effectively utilize the kinetic energy of the airflow itself to achieve dynamic changes in structural movement or airflow distribution range, resulting in low airflow utilization efficiency.

[0008] Therefore, how to improve the temperature uniformity inside the high and low temperature test chamber by utilizing the characteristics of airflow itself, increasing the degree of airflow disturbance, and achieving dynamic coverage of the test space without significantly increasing structural complexity and energy consumption has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0009] To address the aforementioned technical problems, this application provides a high and low temperature test chamber for improving temperature uniformity.

[0010] This application provides a high and low temperature test chamber for improving temperature uniformity, employing the following technical solution: A high and low temperature test chamber for improving temperature uniformity includes a chamber body, and a circulation device is provided inside the chamber body. The circulation device includes: A base, on which a support frame for placing the test product is provided; A circulation mechanism, which is rotatably connected to the base and arranged around the support frame; The circulation mechanism includes: Rotate the limiting ring connected to the base; Several bottom tubes are arranged radially along the limiting ring; An air outlet is provided inside the box, and an air inlet pipe is rotatably connected to the air outlet. A top pipe corresponding to the bottom pipe is connected to the air inlet pipe. The bottom pipe and the top pipe are connected by a connecting pipe, which is a telescopic structure. The bottom pipe, top pipe, and connecting pipe are all equipped with air nozzles for blowing air toward the support frame. A driving mechanism is provided inside the connecting pipe. The driving mechanism includes rotating blades disposed inside the connecting pipe. Airflow enters the connecting pipe and drives the rotating blades to rotate, thereby causing the bottom pipe, top pipe and connecting pipe to rotate around the base. The connecting pipe includes an air outlet pipe and a first positioning pipe that is slidably connected to both ends of the air outlet pipe. The bottom pipe and the top pipe are respectively provided with a second positioning pipe at their ends, and the first positioning pipe is sleeved on the second positioning pipe; A connecting elastic element is provided between the first positioning tube and the air outlet tube; The inner walls of the bottom pipe, top pipe and air outlet pipe are provided with a spiral groove structure. The airflow forms a rotating flow path under the guidance of the spiral groove and generates an axial component force, which drives the air outlet pipe to move axially relative to the first positioning pipe and forms a reciprocating motion under the action of the connecting elastic element. This allows the connecting pipe to simultaneously generate circumferential rotation and axial reciprocating motion under the action of airflow, thereby achieving spatial sweeping airflow on the test product on the support frame.

[0011] Furthermore, the connecting elastic element is a compression spring, which is sleeved on the outside of the first positioning tube, and its two ends abut against the first positioning tube and the air outlet tube respectively.

[0012] Furthermore, the spiral grooves are continuously spirally distributed along the inner wall of the tube, with a spiral angle of 10° to 60°.

[0013] Furthermore, the rotating blade is an inclined turbine blade.

[0014] Furthermore, the spiral groove structure has a gradually deepening transition section at the bottom of the groove near the first positioning tube end of the air outlet pipe. The depth of the transition section gradually changes from 10% to 2% of the pipe diameter to smooth the initial generation of axial force and avoid sudden impact on the connecting elastic element.

[0015] Furthermore, the trailing edge of the rotating blade is provided with a sawtooth vortex generator, the height of which is 20% to 40% of the blade thickness, to enhance the airflow separation vortex and improve the driving efficiency of the rotating blade for airflow.

[0016] Furthermore, the inner and outer walls of the joint between the first and second positioning tubes are both machined with micro-spiral textures to form a lubricating oil film, reduce sliding friction, and assist in axial positioning.

[0017] Furthermore, an airflow divider plate is provided in the middle of the air outlet of the connecting pipe. The divider plate is cross-shaped and divides the interior of the air outlet into four uniform airflow channels. The surface of the divider plate is machined with guide grooves that are consistent with the direction of the spiral grooves, so as to distribute the airflow evenly to each air outlet and further improve the temperature uniformity.

[0018] In summary, this application includes at least one of the following beneficial technical effects: By using a combination of circumferential rotation and axial reciprocating motion driven by airflow, the test products on the support frame are subjected to spatial sweeping airflow, which effectively eliminates the temperature dead zones and stratification caused by traditional fixed air outlets. The temperature uniformity inside the chamber is improved, making it particularly suitable for batch testing of complex shapes or multiple products, thereby improving the repeatability and reliability of test results.

[0019] The coordinated design of the rotating blades and spiral groove structure inside the connecting pipe utilizes the kinetic energy of the airflow itself to achieve dynamic sweeping without motor drive, avoiding the independent drive device required by traditional rotating air supply mechanisms, reducing energy consumption and simplifying the mechanical structure, and improving system reliability and maintenance convenience.

[0020] The optimized combination of the spiral groove gradually deepening transition section, the sawtooth vortex generator, and the micro-spiral texture lubrication structure makes the axial reciprocating motion smooth and stable, improves the blade driving efficiency, reduces the sliding friction coefficient, ensures fault-free reciprocating cycles, and significantly extends the service life of the equipment.

[0021] The cross-shaped airflow splitter and guide channel design ensures that the airflow is evenly distributed to each air outlet, further optimizing the three-dimensional flow field distribution and maintaining temperature uniformity under rapid heating and cooling conditions, thus meeting the requirements of high-precision environmental reliability testing. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of an embodiment of this application.

[0023] Figure 2 This is a schematic diagram of the structure of the circulation device according to an embodiment of this application.

[0024] Figure 3 This is a schematic diagram of the driving mechanism in an embodiment of this application.

[0025] Figure 4 This is a schematic diagram of the connection structure of the connecting pipe in an embodiment of this application.

[0026] Explanation of reference numerals in the attached drawings: 1. Box body; 2. Base; 3. Support frame; 4. Limiting ring; 5. Bottom pipe; 6. Air inlet pipe; 7. Top pipe; 8. Connecting pipe; 9. Air outlet pipe; 10. First positioning pipe; 11. Second positioning pipe; 12. Connecting elastic element; 13. Rotating blade. Detailed Implementation

[0027] The terminology used in the following embodiments is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. As used in the specification and appended claims of this application, the singular expressions “a,” “an,” “the,” “the,” “the,” and “this” are intended to also include expressions such as “one or more,” unless the context clearly indicates otherwise. It should also be understood that in the following embodiments of this application, “at least one” and “one or more” refer to one, two, or more than two. The term “and / or” is used to describe the relationship between related objects, indicating that three relationships may exist; for example, A and / or B can indicate: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character “ / ” generally indicates that the preceding and following related objects are in an “or” relationship.

[0028] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0029] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail. Example 1

[0030] This embodiment provides a high and low temperature test chamber for improving temperature uniformity, including a chamber body 1. A circulation device is installed inside the chamber body 1. The circulation device includes a base 2, on which a support frame 3 for placing test products is fixedly mounted. The support frame 3 adopts a mesh or multi-layer tray structure to ensure stable placement of the test products and allow airflow from multiple directions.

[0031] The circulation device also includes a circulation mechanism, which is rotatably connected to the base 2 via bearings or balls and is arranged around the support frame 3 to achieve 360° rotation coverage.

[0032] The circulation mechanism specifically includes a limiting ring 4, which is rotatably connected to the upper surface of the base 2 to provide rotational guidance. Several bottom tubes 5 are evenly arranged radially along the limiting ring 4, preferably 4 to 8 in this embodiment, in a radial distribution. One end of the bottom tube 5 is fixed to the limiting ring 4, and the other end extends to the bottom of the support frame 3.

[0033] An air outlet is provided on the top or side wall of the housing 1. An air inlet pipe 6 is rotatably connected to the air outlet via a bearing. The lower end of the air inlet pipe 6 is connected to a top pipe 7 that corresponds one-to-one with the bottom pipe 5. The number of top pipes 7 is the same as that of the bottom pipes 5.

[0034] The bottom pipe 5 and the corresponding top pipe 7 are connected by a connecting pipe 8, which has a telescopic structure. Specifically, the connecting pipe 8 includes an air outlet pipe 9 and first positioning pipes 10 that are slidably connected to both ends of the air outlet pipe 9. Second positioning pipes 11 are respectively provided at the ends of the bottom pipe 5 and the top pipe 7, and the first positioning pipes 10 are sleeved on the second positioning pipes 11 to achieve axial sliding connection. A connecting elastic element 12 is provided between the first positioning pipe 10 and the air outlet pipe 9. The connecting elastic element 12 is a compression spring, sleeved on the outside of the first positioning pipe 10, with its two ends abutting against the stepped surface of the first positioning pipe 10 and the inner end face of the air outlet pipe 9, respectively. The compression spring is made of high-temperature resistant stainless steel, and the spring stiffness is matched according to the airflow pressure to ensure smooth reciprocating motion without jamming. Multiple air outlets facing the support frame 3 are provided on the bottom pipe 5, the top pipe 7, and the connecting pipe 8. The air outlets are distributed in a slit-like or circular hole array to ensure that the airflow directly blows onto the surface of the test product.

[0035] A drive mechanism is installed inside the connecting pipe 8. The drive mechanism includes rotating blades 13 installed inside the outlet pipe 9. The rotating blades 13 are inclined turbine blades with an installation angle of 25° to 40° and 6 to 12 blades. The blades are made of corrosion-resistant aluminum alloy or engineering plastic to ensure long-term reliable rotation within a test temperature range of -70°C to +180°C. A sawtooth vortex generator is provided on the trailing edge of the rotating blades 13. The serration height is 20% to 40% of the blade thickness, preferably 30% in this embodiment. This vortex generator can enhance the airflow separation vortex, improve the driving efficiency of the rotating blades 13 on the airflow, and further improve the overall rotation speed and sweeping coverage effect.

[0036] After the airflow enters the connecting pipe 8 from the air inlet pipe 6, it drives the rotating blade 13 to rotate at high speed, thereby causing the bottom pipe 5, top pipe 7, and connecting pipe 8 to rotate circumferentially around the limiting ring 4 on the base 2.

[0037] Reference Figure 3 and Figure 4 The inner walls of the bottom pipe 5, top pipe 7, and outlet pipe 9 are all equipped with spiral groove structures. The spiral grooves are continuously spirally distributed along the inner wall of the pipe, with a spiral angle of 10° to 60°, preferably 30° to 45° in this embodiment. The groove depth is 5% to 15% of the pipe diameter, and the groove width is 8% to 12% of the pipe diameter to ensure that the rotational kinetic energy of the airflow is fully converted into axial driving force. When the airflow passes through the spiral grooves, it is guided to form a high-speed rotating flow path, and at the same time, a significant axial component force is generated, driving the outlet pipe 9 to move axially relative to the first positioning pipe 10, and forming a high-frequency reciprocating motion under the action of the connecting elastic element 12. The connecting pipe 8 generates circumferential rotational motion and axial reciprocating motion simultaneously under the drive of the airflow, so that each air outlet can achieve spatial sweeping airflow to the test product on the support frame 3, effectively eliminating the temperature dead zone and stratification phenomenon generated by the traditional fixed circulation structure.

[0038] The spiral groove structure has a gradually deepening transition section at the bottom of the groove near the first positioning tube 10 at the end of the air outlet duct 9. The depth of the transition section gradually changes from 10% to 2% of the pipe diameter, and the length is 1 to 2 times the diameter of the air outlet duct 9. This transition section is used to smooth the initial generation of axial force, avoid sudden impact on the connecting elastic element 12, and extend the service life of the components.

[0039] The inner and outer walls of the first positioning tube 10 and the second positioning tube 11, as well as the sleeve joint, are all machined with micro-spiral textures (pitch 0.5-2mm, depth 0.05-0.15mm) to form a dynamic lubricating oil film (using high-temperature grease) during sliding, which significantly reduces the sliding friction coefficient and assists in axial positioning to prevent jamming or excessive shaking.

[0040] An airflow divider is provided in the middle of the air outlet duct 9 of the connecting pipe 8. The divider is cross-shaped and divides the interior of the air outlet duct 9 into four uniform airflow channels. The surface of the divider is machined with guide grooves that are aligned with the spiral grooves to ensure that the airflow is evenly distributed to each air outlet, further improving temperature uniformity and preventing unilateral airflow bias.

[0041] When the circulating fan of the high and low temperature test chamber starts, the airflow enters the inlet pipe 6 from the outlet, then flows sequentially through the top pipe 7, connecting pipe 8, and bottom pipe 5, finally exiting from each blower. During this process: The airflow drives the rotating blade 13 to rotate, achieving circumferential sweeping of the entire circulation mechanism; The spiral groove structure causes the airflow to generate a combined rotational and axial motion, which drives the connecting pipe 8 to reciprocate and expand axially. The compression spring provides the restoring force, forming a stable reciprocating cycle; Micro-spiral textures, flow dividers, and vortex generators further optimize airflow distribution and motion efficiency.

[0042] The above structure requires no additional motor or drive device, and fully utilizes the kinetic energy of the airflow to achieve three-dimensional dynamic air blowing in space. Compared with the fixed or single rotating structure in the prior art, it can significantly eliminate temperature dead zones and improve the temperature uniformity inside the box 1 (measured to within ±0.5℃). It has a simple structure, low energy consumption, and high reliability, and perfectly solves the problems of insufficient airflow coverage, temperature stratification, and complex structure in the prior art.

[0043] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Those skilled in the art can make various improvements and modifications without departing from the spirit and scope of the present invention, and these improvements and modifications should also be considered within the protection scope of the present invention. Example 2

[0044] The difference from Embodiment 1 is that the pitch or depth of the spiral groove gradually changes along the airflow direction. This causes the axial thrust generated by the airflow to change non-linearly, resulting in uneven expansion and contraction speeds of the connecting pipe 8, forming a special motion pattern of "fast advance and slow retreat" or "slow advance and slow deceleration". This irregular motion can more effectively disperse dead zones in the airflow and avoid the generation of new standing waves or stable vortex regions due to periodic motion.

[0045] The outer wall of the air outlet duct 9 is equipped with spiral or intermittent flexible baffles or brushes. When the connecting pipe 8 rotates circumferentially, these baffles directly agitate the outside air like fan blades, and can also adsorb impurities in the air; when it reciprocates axially, the baffles sweep across the space around the support frame 3. This is equivalent to adding a dynamic baffle device outside the air outlet without increasing energy consumption, with internal and external linkages greatly improving the uniformity of airflow.

[0046] The above are merely preferred embodiments of this application. The scope of protection of this application is not limited to the above embodiments. Any equivalent modifications or changes made by those skilled in the art based on the content disclosed in this application should be included within the scope of protection recorded in the claims.

Claims

1. A high and low temperature test chamber for improving temperature uniformity, comprising a chamber body (1), characterized in that: The housing (1) is equipped with a circulation device, which includes: A base (2), on which a support frame (3) for placing test products is provided; A circulation mechanism, which is rotatably connected to the base (2) and arranged around the support frame (3); The circulation mechanism includes: Rotate the limiting ring (4) connected to the base (2); A plurality of bottom tubes (5) are arranged radially along the limiting ring (4); An air outlet is provided inside the box (1), and an air inlet pipe (6) is rotatably connected to the air outlet. A top pipe (7) corresponding to the bottom pipe (5) is connected to the air inlet pipe (6). The bottom pipe (5) and the top pipe (7) are connected by a connecting pipe (8), which is a telescopic structure; The bottom pipe (5), top pipe (7) and connecting pipe (8) are all provided with air outlets for blowing air toward the support frame (3); A driving mechanism is provided inside the connecting pipe (8). The driving mechanism includes a rotating blade (13) disposed inside the connecting pipe (8). When the airflow enters the connecting pipe (8), it drives the rotating blade (13) to rotate, thereby causing the bottom pipe (5), top pipe (7) and connecting pipe (8) to rotate around the base (2). The connecting pipe (8) includes an air outlet pipe (9) and a first positioning pipe (10) that is slidably connected to both ends of the air outlet pipe (9); The bottom pipe (5) and the top pipe (7) are respectively provided with a second positioning pipe (11), and the first positioning pipe (10) is sleeved on the second positioning pipe (11); A connecting elastic element (12) is provided between the first positioning tube (10) and the air outlet tube (9); The inner walls of the bottom pipe (5), top pipe (7) and air outlet pipe (9) are provided with a spiral groove structure. The airflow forms a rotating flow path under the guidance of the spiral groove and generates an axial component force, which drives the air outlet pipe (9) to move axially relative to the first positioning pipe (10) and forms a reciprocating motion under the action of the connecting elastic member (12). This causes the connecting pipe (8) to simultaneously generate circumferential rotation and axial reciprocating motion under the action of airflow, thereby realizing spatial sweeping airflow on the test product on the support frame (3).

2. The high-low temperature test chamber for improving temperature uniformity according to claim 1, wherein: The connecting elastic element (12) is a compression spring, which is sleeved on the outside of the first positioning tube (10) and its two ends abut against the first positioning tube (10) and the air outlet tube (9) respectively.

3. A high and low temperature test chamber for improving temperature uniformity according to claim 2, characterized in that: The spiral grooves are continuously spirally distributed along the inner wall of the tube, with a spiral angle of 10° to 60°.

4. A high and low temperature test chamber for improving temperature uniformity according to claim 2, characterized in that: The pitch or depth of the spiral groove gradually changes along the airflow direction.

5. A high and low temperature test chamber for improving temperature uniformity according to claim 2, characterized in that: Spiral or intermittent flexible baffles or brushes are provided on the outer wall of the air outlet duct (9).

6. A high and low temperature test chamber for improving temperature uniformity according to claim 1, characterized in that: The rotating blade (13) is an inclined turbine blade.

7. A high and low temperature test chamber for improving temperature uniformity according to any one of claims 3 or 4, characterized in that: The spiral groove structure has a gradually deepening transition section at the bottom of the groove at the end of the air outlet pipe (9) near the first positioning pipe (10). The depth of the transition section gradually changes from 10% to 2% of the pipe diameter to smooth the initial generation of axial force and avoid sudden impact on the connecting elastic element (12).

8. A high and low temperature test chamber for improving temperature uniformity according to claim 6, characterized in that: The trailing edge of the rotating blade (13) is provided with a sawtooth vortex generator. The height of the sawtooth is 20% to 40% of the blade thickness. This is used to enhance the airflow separation vortex and improve the driving efficiency of the rotating blade (13) for the airflow.

9. A high and low temperature test chamber for improving temperature uniformity according to any one of claims 3-5, characterized in that: The inner and outer walls of the joint between the first positioning tube (10) and the second positioning tube (11) are both processed with micro-spiral textures to form a lubricating oil film, reduce sliding friction and assist in axial positioning.

10. A high and low temperature test chamber for improving temperature uniformity according to claim 1, characterized in that: An airflow divider is provided in the middle of the air outlet pipe (9) of the connecting pipe (8). The divider is cross-shaped and divides the interior of the air outlet pipe (9) into four uniform airflow channels. The surface of the divider is machined with a guide groove that is consistent with the direction of the spiral groove, so as to distribute the airflow evenly to each air outlet and further improve the temperature uniformity.

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