WO2023245970A1

WO2023245970A1 - Non-steady-state wall heat transfer characteristic testing device

Info

Publication number: WO2023245970A1
Application number: PCT/CN2022/132118
Authority: WO
Inventors: 田国华; 刘朋; 李任; 张丽娟; 缪正坤; 王东
Original assignee: 江苏建筑职业技术学院
Priority date: 2022-06-20
Filing date: 2022-11-16
Publication date: 2023-12-28
Also published as: CN115096934B; CN115096934A; ZA202303707B

Abstract

A non-steady-state wall heat transfer characteristic testing device comprises a hot box (1), a cold box (2) and a test piece frame installed between the hot box (1) and the cold box (2), wherein the test piece frame comprises a U-shaped fixed frame (3) and a movable bearing frame (4); two sides of the U-shaped fixed frame (3) are respectively connected in a sealed mode to the hot box (1) and the cold box (2); and a wall body (5) is assembled on the movable bearing frame (4) and is inserted into or separated from the U-shaped fixed frame (3) by means of an opening of the U-shaped fixed frame (3), and then the wall body (5) can be pushed to enter the hot box (1) and the cold box (2) for heat transfer characteristic test operation, or can be separated from the hot box (1) and the cold box (2). Under the action of a driving member, a driven member and linkage members, when the wall body (5) enters the hot box (1) and the cold box (2), monitoring plates (6) can be driven to move towards the wall body (5), and are automatically attached to the wall body (5) for temperature monitoring; and when the wall body (5) moves away from the hot box (1) and the cold box (2), the two monitoring plates (6) can automatically reset to be away from the wall body (5), so that the sealing performance of the hot box (1) and the cold box (2) is improved, a window for a human entering the hot box (1) and the cold box (2) for attachment operation is not needed to be reserved, and the use is more convenient and reliable.

Description

An unsteady wall heat transfer characteristic testing device

Technical field

The invention relates to the technical field of heat transfer characteristic testing, specifically an unsteady wall heat transfer characteristic testing device.

Background technique

Wall heat transfer characteristics are generally tested using the calibrated hot box method, which includes a cold box, a hot box, a specimen rack and a data acquisition device. In the boxes (hot box and cold box) on both sides of the specimen, all the After the required temperature, wind speed and radiation conditions reach a stable state, the air temperature, the surface temperature of the specimen and the inner wall of the box and the power input to the metering box are measured, and the heat transfer coefficient of the specimen can be calculated according to the formula. The existing calibrated hot box method test device, the cold and hot box temperatures are both constant temperatures, which is a steady-state test, and can only match the test of one height of wall, and the test installation and disassembly of the wall are relatively complicated and require It is time-consuming and labor-intensive to transport the wall into the box and install the artifact data collection device on the wall. Therefore, there is an urgent need for an unsteady wall heat transfer characteristic testing device to solve the above problems.

Contents of the invention

The present invention provides an unsteady-state wall heat transfer characteristic testing device that matches walls of various heights, has simple wall disassembly and assembly operations, and improves testing efficiency to solve the above-mentioned problems existing in the prior art.

In order to achieve the above object, the present invention provides the following technical solution: an unsteady wall heat transfer characteristic testing device, including a hot box and a cold box, and a test specimen frame installed between the hot box and the cold box. The component frame includes a U-shaped fixed frame and a movable load-bearing frame. The two sides of the U-shaped fixed frame are sealed with the hot box and the cold box respectively. The wall is assembled on the movable load-bearing frame, and is opened by the U-shaped fixed frame. Inserting or detaching the U-shaped holder;

At least a pair of monitoring boards are symmetrically and slidingly installed in the hot box and the cold box. Several high temperature sensors and heat flow sensors are installed on the monitoring board, wherein a follower is installed on the U-shaped fixing frame. A driving part is installed on the movable bearing frame, and a linkage piece is installed between each monitoring board of the driven part. As the movable bearing frame is inserted into or separated from the U-shaped fixed frame, a pair of monitoring boards are controlled to move close to each other and fit in the on the wall, or reset away from each other.

Preferably, the hot box uses a resistance heater as the heat source to control the temperature fluctuation range in the hot box to room temperature -50°C. The heat source is equipped with an insulated reflective cover that shields radiation, and the cold box is equipped with refrigeration equipment. , controlling the temperature fluctuation range in the cold box to be -15°C - room temperature.

Preferably, the top of the U-shaped fixing frame is provided with a through slot along the sliding direction of the movable bearing frame, and a positioning plate is slidably installed in the through slot. One end of the positioning plate extends into the U-shaped fixing frame, and the positioning plate extends into the U-shaped fixing frame. The end is located on one side of the opening of the U-shaped fixing frame and is arranged in an arc shape. As the movable bearing frame is inserted into or separated from the U-shaped fixing frame, the positioning plate is driven to move up or down for reset.

Preferably, a corrugated telescopic sleeve is installed at the top of the U-shaped fixing frame at the slot, and one end of the positioning plate extends out of the U-shaped fixing frame and is located in the corrugated telescopic sleeve. As the positioning plate moves up or down, the corrugated telescopic sleeve is driven. The sleeve stretches or contracts to reset.

Preferably, the extending end of the positioning plate is provided with a chute, and a counterweight is slidably installed in the chute at the opening of the U-shaped fixing frame. An elastic block is installed between the counterweight and the side wall of the chute close to the opening. The elastic member tends to drive the counterweight block to move toward the opening direction. A push plate is spliced at the top center of the wall. It enters the U-shaped fixing frame with the wall. The push plate slide slides until it contacts the counterweight block. weight, and push the counterweight to the center of the extending end of the positioning plate.

Preferably, the movable carrier includes a vertical plate for sealing the opening of the U-shaped fixed frame and a bottom plate perpendicular to the vertical plate. The bottom of the bottom plate is provided with moving wheels, and a receiving plate is installed on the top surface of the bottom plate. , The top of the receiving plate is provided with a first groove for carrying the bottom end of the wall, and the side of the U-shaped fixing frame away from the opening is provided with a second groove for receiving one side wall of the wall.

Preferably, first airbags are installed on both sides of the notches of the first groove and the second groove, and second airbags are provided in the first groove and the second groove away from the notches. Communicated with the second air bag, it is inserted into the first groove and the second groove along with the wall, pushing the gas in the second air bag into the first air bag, so that the first air bag is closely attached to the wall.

Preferably, a clamp block is installed in both the first groove and the second groove, and the clamp block is installed in the first air bag and the second air bag, and is controlled when the second air bag is pressed. The clamping block is inserted into the wall in a closed direction.

Preferably, the driving member includes a first rack mounted on the side wall of the base plate, the driven member includes a driven gear installed at the center of the bottom end of the U-shaped fixing frame, and the linkage member includes a pair of A pulley, a linkage gear and a second rack. The pair of pulleys are coaxially connected to the driven gear and the linkage gear respectively, and the two pulleys are connected through a linkage belt. The second rack is installed on the On the monitoring board, the linkage gear meshes with the second rack.

Preferably, a temperature sensor for measuring the temperature on the wall of the box is installed on the side walls of the hot box and the cold box.

Compared with the prior art, the beneficial effects of the present invention are: In the present invention, a specimen frame is installed between the hot box and the cold box, and under the action of the U-shaped fixed frame and the movable bearing frame, the wall is placed On the movable load-bearing frame, the wall panel can be pushed into the hot box and cold box for heat transfer characteristic testing operations, or separated from the hot box and cold box, and under the action of the driving parts, driven parts and linkage parts, when the wall When the board enters the hot box and cold box, it can drive the monitoring board to move toward the wall board and automatically fit on the wall board for temperature monitoring. When the wall board moves away from the hot box and cold box, the two monitoring boards can automatically Resetting away from the wall panel makes it more convenient to use, improves the sealing of the hot box and cold box, and eliminates the need to reserve windows for manual entry into the hot box and cold box for lamination operations;

Among them, in the present invention, through the function of the positioning plate, it can enter the U-shaped fixing frame along with the wall, and automatically lift the positioning plate according to the height of the wall, thereby automatically matching the height of different walls to be measured and avoiding different wall heights. , there is a gap between the top of the U-shaped fixing frame and the wall, which affects the test accuracy. Through the action of the counterweight block, the gravity can be configured at the opening in the initial state to facilitate the entry of the wall. The positioning plate is lifted, and when the wall is fully inserted, it drives the counterweight block to move to the center of the top of the U-shaped fixing frame, so that the entire positioning block applies force evenly to the top of the wall, improving the sealing effect of the contact.

In addition, in the present invention, the wall can be restricted and fixed through the first groove and the second groove, and through the action of the first air bag and the second air bag, the grooves of the first groove and the second groove can be fixed. The opening is sealed, and with the function of the clamping block, the inserted wall can be clamped and fixed to improve the stability of the insertion.

Description of the drawings

The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. They are used to explain the present invention together with the embodiments of the present invention and do not constitute a limitation of the present invention.

In the attached picture:

Figure 1 is a schematic structural diagram of the heat transfer characteristic testing device of the present invention;

Figure 2 is a schematic structural diagram of the specimen frame of the present invention;

Figure 3 is a front view of the specimen frame of the present invention;

Figure 4 is a schematic structural diagram of the U-shaped fixing frame of the present invention;

Figure 5 is a schematic structural diagram of the movable bearing frame of the present invention;

Figure 6 is a front view of the movable bearing frame of the present invention;

Figure 7 is a schematic structural diagram of area A in Figure 6 of the present invention;

Numbers in the figure: 1. Hot box; 2. Cold box; 3. U-shaped fixed frame; 31. Second groove; 4. Movable bearing frame; 41. Vertical plate; 42. Bottom plate; 43. Moving wheel; 44. Accepting plate; 45. First groove; 5. Wall; 6. Monitoring board; 61. Support rod; 62. Elastic sealing gasket; 7. High temperature sensor; 8. Heat flow sensor; 9. Through slot; 10. Positioning Plate; 11. Corrugated telescopic sleeve; 12. Chute; 13. Counterweight block; 14. Elastic member; 15. Push plate; 16. First air bag; 17. Second air bag; 18. Clamp block; 181. Fixed plate ; 182. Inclined plate; 183. Trigger plate; 19. First rack; 20. Driven gear; 21. Pulley; 22. Linkage gear; 23. Second rack; 24. Slide; 25. Guide rod; 26. Slot; 27. Boot slot.

Detailed ways

The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Embodiment: As shown in Figure 1, an unsteady wall heat transfer characteristic testing device includes a hot box 1 and a cold box 2, and a test specimen frame installed between the hot box 1 and the cold box 2. The test piece The frame includes a U-shaped fixed frame 3 and a movable bearing frame 4. The two sides of the U-shaped fixed frame 3 are sealed with the hot box 1 and the cold box 2 respectively. The wall 5 is assembled on the movable bearing frame 4 and is fixed by the U-shaped frame. The opening of the frame 3 is inserted into or separated from the U-shaped fixed frame 3. At least a pair of monitoring boards 6 are symmetrically and slidingly installed in the hot box 1 and the cold box 2. Several high temperature sensors 7 and heat flow sensors 8 are installed on the monitoring boards 6, among which , a follower is installed on the U-shaped fixed frame 3, a driving part is installed on the movable load-bearing frame 4, and linkage parts are installed between each monitoring board 6 of the driven member, and the movable load-bearing frame 4 is inserted into or out of the U-shaped fixed frame. 3. Control a pair of monitoring boards 6 to move closer to each other and fit against the wall 5, or to reset away from each other.

Among them, the wall of the hot box 1 is a thermal uniform body to ensure uniform temperature on the inner surface of the box wall, and a computer-programmed automatically controlled resistance heater is used as a heat source in the box to control the temperature fluctuation range in the hot box 1 to room temperature -50°C. , the heat source should be shielded by an insulating reflector to minimize the radiant heat radiated to the metering box wall and wall 5;

Computer-programmed automatic control refrigeration equipment is installed in the cold box 2. The temperature fluctuation range in the cold box 2 is controlled to be -15℃-room temperature, which can realize automatic control of the harmonic temperature curve. A resistance heater can be set at the evaporator outlet of the refrigeration equipment. , to accurately adjust the temperature of the cold box 2. In order to evenly distribute the air temperature in the box, a guide screen can be installed. And the motors, fans and evaporators of the refrigeration equipment are all radiation shielded.

Referring to Figures 2 and 3, slideways 24 are installed in both hot box 1 and cold box 2. A support rod 61 is installed at the bottom of the monitoring board 6. A slider is installed at the bottom of the support rod 61. The slider is slidably installed on the In the slideway 24, an elastic sealing gasket 62 surrounds the edge of the monitoring board 6 close to the wall 5. As the monitoring board 6 approaches the wall 5, the elastic sealing gasket 62 closely fits the wall 5, which can not only buffer, This avoids collision of the monitoring board 6 and seals the edges of the monitoring board 6, thereby improving the monitoring accuracy of the high temperature sensor 7 and the heat flow sensor 8 on the monitoring board 6.

Refer to Figure 4, which is a diagram of a U-shaped fixed frame 3, in which a through groove 9 is provided at the top of the U-shaped fixed frame 3 along the sliding direction of the movable bearing frame 4, and a positioning plate 10 is slidably installed in the through groove 9. The positioning plate 10 One end extends into the U-shaped fixing frame 3, and the extending end of the positioning plate 10 is located on the opening side of the U-shaped fixing frame 3 and is arranged in an arc. The movable load-bearing frame 4 is inserted into or out of the U-shaped fixing frame 3, and the wall 5 is connected to the arc. The shaped part contacts, and the positioning block is pushed upward to the top area of the wall 5 to automatically match the height of the wall 5 to avoid leaving gaps at the top of the wall 5. A corrugated telescopic sleeve is installed at the top of the U-shaped fixing frame 3 at the slot 9 11. One end of the positioning plate 10 extends out of the U-shaped fixing frame 3 and is located in the corrugated telescopic sleeve 11. As the positioning plate 10 moves up or down, the corrugated telescopic sleeve 11 is stretched or shrunk and reset, thereby improving the sealing and preventing heat from passing through the slot 9 Loss everywhere;

A guide rod 25 and a guide groove are provided at the bottom end of the U-shaped fixed frame 3 for splicing with the movable carrier frame 4 .

Among them, as shown in 3, a chute 12 is provided at the extending end of the positioning plate 10. A counterweight 13 is slidably installed in the chute 12 at the opening of the U-shaped fixing frame 3. The counterweight 13 is close to the chute 12. An elastic member 14 is installed between one side wall of the opening. The elastic member 14 tends to drive the counterweight 13 to move toward the opening. A push plate 15 is spliced at the top center of the wall 5 and enters the U-shaped fixing frame 3 along with the wall 5 , the push plate 15 slides the chute 12 until it contacts the counterweight block 13, and pushes the counterweight block 13 to the center of the extending end of the positioning plate 10, so that the gravity can be placed at the opening in the initial state to facilitate the wall 5 When entering, the entire positioning plate 10 can be lifted, and when the wall 5 is completely entered, the counterweight block 13 is driven to move to the center of the top of the U-shaped fixing frame 3, so that the entire positioning block exerts force on the top of the wall 5 evenly. , improve the sealing effect of the contact.

Referring to Figures 5-7, the movable carrier 4 includes a vertical plate 41 for sealing the opening of the U-shaped fixed frame 3 and a bottom plate 42 perpendicular to the vertical plate 41. The bottom plate 42 is provided with a moving wheel 43 for easy pushing. The movable bearing frame 4 moves, and a receiving plate 44 is installed on the top surface of the bottom plate 42. The receiving plate 44 is provided with a slot 26 at one end away from the vertical plate 41, and enters the U-shaped fixed frame 3 with the movable bearing frame 4. The bottom plate 42 is along the The guide groove enters, and the slot 26 is sleeved on the guide rod 25 to improve the tightness of the connection between the movable bearing frame 4 and the U-shaped fixed frame 3. A first groove 45 is provided at the top of the receiving plate 44 to bear the bottom end of the wall 5. The bottom end of the wall 5 is inserted into the first groove 45. A second groove 31 for receiving one side wall of the wall 5 is provided in the U-shaped fixing frame 3 on the side away from the opening. The wall 5 enters the U-shaped fixing frame 3 along with the wall 5. , one side wall of the wall 5 is inserted into the second groove 31, wherein, as shown in FIG. 7, first air bags 16 are installed on both sides of the first groove 45 and the second groove 31. A second airbag 17 is provided in the groove 45 and the second groove 31 away from the groove opening. The first airbag 16 is connected with the second airbag 17 and is inserted into the first groove 45 and the second groove 31 along with the wall 5 , pushing the gas in the second air bag 17 into the first air bag 16, so that the first air bag 16 is closely attached to the wall 5, that is, when the wall 5 is inserted into the first groove 45 and the second groove 31, The second air bag 17 is pressurized, and the gas in the second air bag 17 flows into the first air bag 16. The first air bag 16 expands and fits the wall 5, thereby improving the sealing performance of the connection between the wall 5 and the slot. A clamp block 18 is installed in both the first groove 45 and the second groove 31, and the clamp block 18 is installed in the first air bag 16 and the second air bag 17, and is pressed by the second air bag 17 to control the clamp block 18 to be inserted into the wall. The body 5 is closed in the direction. In this embodiment, a clamping block 18 is provided. As shown in FIG. 7 , the clamping block 18 includes a fixed plate 181, an inclined plate 182 and a triggering plate 183. The triggering plate 183 is arranged in a triangle on the third In the second air bag 17, the top corner of the trigger plate 183 is hinged. A return spring is installed between the hinge and the first groove 45 and the second groove 31. The inclined plate 182 is arranged in the receiving plate 44 and the inclined plate 182 is arranged in the receiving plate 44. The center of 182 is rotated and fixed, and the fixed plate 181 is arranged in the first air bag 16. One end of the inclined plate 182 is hinged with the fixed plate 181, and the other end is hinged with one end of the trigger plate 183. When the second air bag 17 is pressed, the triangular trigger plate is squeezed. The compression return spring of 183 moves downward, and the end of the trigger plate 183 expands outward, pushing the inclined plate 182 to rotate around the center. The other end of the inclined plate 182 pushes the fixed plate 181 to move toward the center of the notch until it contacts the wall 5, facing the wall. Body 5 is clamped and fixed.

Referring to Figure 2, the driving member includes a first rack 19 installed on the side wall of the base plate 42, the driven member includes a driven gear 20 installed at the center of the bottom end of the U-shaped fixed frame 3, and the linkage member includes a pair of pulleys. 21. The linkage gear 22 and the second rack 23. A pair of pulleys 21 are coaxially connected to the driven gear 20 and the linkage gear 22 respectively, and the two pulleys 21 are connected through a linkage belt. The second rack 23 is installed on the monitoring On the plate 6, the linkage gear 22 meshes with the second rack 23.

In this embodiment, a temperature sensor 7 for measuring the temperature on the wall of the box is installed on the side walls of the hot box 1 and the cold box 2, and the temperature of the wall is monitored by monitoring the temperature inside the box and the temperature of the side wall of the wall 5. 5 heat transfer characteristics are comprehensively considered.

Finally, it should be noted that the above are only preferred examples of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still Modify the technical solutions described in the foregoing embodiments, or make equivalent replacements for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

An unsteady wall heat transfer characteristic testing device, characterized by: including a hot box and a cold box, and a specimen frame installed between the hot box and the cold box, the specimen frame including a U-shaped fixing frame and A movable bearing frame, wherein the two sides of the U-shaped fixing frame are sealedly connected to the hot box and the cold box respectively, the wall is assembled on the movable bearing frame, and the U-shaped fixing frame is inserted into or separated from the U-shaped fixing frame through the opening;

At least a pair of monitoring boards are symmetrically and slidingly installed in the hot box and the cold box. Several high temperature sensors and heat flow sensors are installed on the monitoring board, wherein a follower is installed on the U-shaped fixing frame. A driving part is installed on the movable bearing frame, and a linkage piece is installed between each monitoring board of the driven part. As the movable bearing frame is inserted into or separated from the U-shaped fixed frame, a pair of monitoring boards are controlled to move close to each other and fit in the on the wall, or reset away from each other.
An unsteady wall heat transfer characteristic testing device according to claim 1, characterized in that: the heat box uses a resistance heater as a heat source, and the temperature fluctuation range in the heat box is controlled to be room temperature-50°C. , the heat source is equipped with an insulating reflective cover that shields radiation; refrigeration equipment is installed in the cold box, and the temperature fluctuation range in the cold box is controlled to be -15°C-room temperature.
An unsteady wall heat transfer characteristic testing device according to claim 1, characterized in that: the top of the U-shaped fixed frame is provided with a through groove along the sliding direction of the movable bearing frame, and a sliding groove is installed in the through groove. Positioning plate, one end of the positioning plate extends into the U-shaped fixing frame, and the extending end of the positioning plate is located on one side of the opening of the U-shaped fixing frame in an arc shape. The positioning plate is driven when the movable bearing frame is inserted into or out of the U-shaped fixing frame. Move up or down to reset.
An unsteady wall heat transfer characteristic testing device according to claim 3, characterized in that: the top of the U-shaped fixing frame is installed with a corrugated telescopic sleeve at the through slot, and the positioning plate extends out of the U-shaped fixing frame. One end of the frame is located on the corrugated telescopic sleeve, and moves up or down along with the positioning plate, driving the corrugated telescopic sleeve to stretch or shrink and reset.
An unsteady wall heat transfer characteristic testing device according to claim 4, characterized in that: the extending end of the positioning plate is provided with a chute, and the chute is located at the opening of the U-shaped fixing frame for sliding installation. There is a counterweight block, and an elastic member is installed between the counterweight block and the side wall of the chute close to the opening. The elastic member tends to drive the counterweight block to move toward the opening. There is a push plate spliced at the top center of the wall, which moves along with the wall. The body enters the U-shaped fixing frame, the push plate slide slides until it contacts the counterweight block, and pushes the counterweight block to the center of the extending end of the positioning plate.
An unsteady wall heat transfer characteristic testing device according to claim 1, characterized in that: the movable bearing frame includes a vertical plate for sealing the opening of the U-shaped fixed frame and a vertical plate perpendicular to the The bottom plate of the vertical plate is provided with moving wheels. A receiving plate is installed on the top surface of the base plate. A first groove is provided at the top of the receiving plate to carry the bottom end of the wall. The side of the U-shaped fixing frame away from the opening is A second groove is provided for receiving one side wall of the wall.
An unsteady wall heat transfer characteristic testing device according to claim 6, characterized in that: first air bags are installed on both sides of the notch of the first groove and the second groove, and the first air bag is installed on both sides of the first groove and the second groove. A second air bag is provided in the groove and the second groove away from the groove opening. The first air bag is connected with the second air bag and is inserted into the first groove and the second groove along with the wall to push the gas in the second air bag to enter. In the first air bag, the first air bag is closely attached to the wall.
An unsteady wall heat transfer characteristic testing device according to claim 7, characterized in that: clamping blocks are installed in both the first groove and the second groove, and the clamping blocks are installed in the In the first air bag and the second air bag, and with the pressure of the second air bag, the direction of the clamping block inserted into the wall is controlled to close.
An unsteady wall heat transfer characteristic testing device according to claim 8, characterized in that: the driving member includes a first rack installed on the side wall of the bottom plate, and the driven member includes a first rack installed on the side wall of the base plate. The driven gear at the center of the bottom end of the U-shaped fixed frame, the linkage component includes a pair of pulleys, a linkage gear and a second rack, the pair of pulleys are coaxially connected to the driven gear and the linkage gear respectively, The two pulleys are connected through a linkage belt, the second rack is installed on the monitoring board, and the linkage gear meshes with the second rack.
An unsteady wall heat transfer characteristic testing device according to claim 1, characterized in that: a high temperature sensor for measuring the wall surface of the box is installed on the side walls of the hot box and the cold box.