Environmental test box for high-power load

Abstract

The utility model relates to a high-power load environment test box which comprises a box body, a mounting frame and an air volume adjusting assembly. The box body is provided with a mounting cavity. The mounting frame is arranged in the mounting cavity, and the mounting frame is used for bearing a plurality of to-be-detected pieces; the air volume adjusting assembly is arranged in the mounting cavity and is arranged on the air inlet side of the mounting frame, the air volume adjusting assembly comprises an air outlet cover plate and a channel adjusting plate which are connected with each other, a plurality of air outlet holes are formed in the air outlet cover plate, and the channel adjusting plate can move relative to the air outlet cover plate so as to adjust the sizes of the air outlet holes. The air outlet cover plate is provided with the channel adjusting plate, and the channel adjusting plate can move relative to the air outlet cover plate, so that the size of the air outlet hole is adjusted, and the size of airflow passing through the air outlet hole is also adjusted. According to the environment test box with the high-power load, by arranging the air volume adjusting assembly, the air inlet volume of the air inlet side of the mounting frame is adjusted, the influence on an experiment due to the fact that the air inlet volume cannot be adjusted and controlled is reduced, and the experiment precision is improved.

Description

Technical Field

[0001] The present application relates to the technical field of environmental test chambers, and in particular to an environmental test chamber for high-power loads. Background Art

[0002] An environmental test chamber is a test equipment that can simulate different environments such as high temperature, high pressure, low temperature, negative pressure, high radiation, snowfall, rain or sand and dust. The test chamber can test a very wide range of products, such as: aerospace, aviation, petroleum, chemical, military, automobile, shipbuilding, communications, electronics and other fields. Among them, the temperature test chamber is an environmental testing equipment that can simulate high and low temperatures. After multiple pieces to be tested are arranged at intervals and placed in the temperature test chamber, the thermal stress and strain of multiple pieces to be tested in extreme high temperature environments or extreme low temperature environments can be tested. However, the air intake at multiple pieces to be tested cannot be adjusted, which easily affects the experimental results. Utility Model Content

[0003] Based on this, it is necessary to provide an environmental test chamber with a high-power load to address the problem of uneven experimental temperature of multiple test pieces.

[0004] An environmental test chamber for a high-power load, the environmental test chamber for a high-power load comprising:

[0005] A box body having a mounting cavity;

[0006] A mounting frame, disposed in the mounting cavity, and used for carrying a plurality of parts to be detected;

[0007] An air volume regulating component is arranged in the installation cavity and on the air inlet side of the installation frame. The air volume regulating component includes a connected air outlet cover plate and a channel regulating plate. The air outlet cover plate is provided with a plurality of air outlet holes. The channel regulating plate can move relative to the air outlet cover plate to adjust the size of the air outlet holes.

[0008] The environmental test chamber for high-power loads mentioned above is provided with a plurality of air outlet holes on the air outlet cover plate of the air volume regulating component by arranging an air volume regulating component on the air inlet side of the mounting frame, and the airflow in the mounting cavity can flow into the mounting frame through the air outlet holes, thereby regulating the experimental temperature of the plurality of parts to be tested carried on the mounting frame. A channel regulating plate is connected to the air outlet cover plate, and the channel regulating plate can move relative to the air outlet cover plate, thereby adjusting the size of the air outlet holes, and also adjusting the size of the airflow passing through the air outlet holes. The environmental test chamber for high-power loads provided in the present application adjusts the air intake on the air inlet side of the mounting frame by arranging an air volume regulating component, thereby reducing the influence of the uncontrollable air intake on the experiment and improving the accuracy of the experiment.

[0009] In one embodiment, the channel adjustment plate is provided with a plurality of adjustment holes, and the size of the adjustment holes is equal to the size of the air outlet;

[0010] The channel adjustment plate has a first state and a second state. When in the first state, the adjustment hole is aligned with the air outlet hole. When in the second state, the adjustment hole is staggered with the air outlet hole so that the channel adjustment plate covers a partial area of ​​the air outlet hole.

[0011] In one of the embodiments, the connecting member passes through the channel adjustment plate and is threadedly connected to the air outlet cover plate to connect the channel adjustment plate and the air outlet cover plate.

[0012] In one of the embodiments, the air volume adjustment assembly further includes a driving member, an output end of which is connected to the channel adjustment plate, and the driving member is capable of driving the channel adjustment plate to move so as to adjust the relative position between the channel adjustment plate and the air outlet cover plate.

[0013] In one embodiment, a plurality of channel adjustment plates are provided, and each of the plurality of channel adjustment plates is connected to the air outlet cover plate.

[0014] In one of the embodiments, it further includes an air volume sensor disposed on the air inlet side of the mounting bracket, wherein the air volume sensor is used to detect the air volume at the air inlet side of the mounting bracket.

[0015] In one of the embodiments, the mounting frame includes a plurality of supporting plates arranged at intervals along the height direction of the box body, and the air volume sensor is installed on the air inlet side of each supporting plate.

[0016] In one of the embodiments, two of the air volume sensors are installed on each of the supporting plates, and the two air volume sensors are arranged along a first direction, wherein the first direction is perpendicular to an air inlet direction on the supporting plate.

[0017] In one of the embodiments, the installation cavity is provided with an installation communication port;

[0018] The high-power load environmental test chamber also includes a damper assembly, which includes an actuator and a damper plate connected to each other. The damper plate has a closed state abutting against the installation connecting port, and an open state with a gap between the installation connecting port. The actuator drives the damper plate to rotate to switch between the closed state and the open state.

[0019] In one embodiment, the damper assembly further includes a damper shaft connected to the actuator, the damper plate includes a first door plate portion and a second door plate portion arranged in parallel, the first door plate portion and the second door plate portion are both connected to the damper shaft and are respectively arranged on both sides of the damper shaft, and the actuator can drive the damper shaft to rotate, so as to drive the first door plate portion and the second door plate portion to rotate;

[0020] When in the closed state, the first door panel portion and the second door panel portion are both in contact with the hole wall of the installation connecting port. When in the open state, there is a gap between at least one of the first door panel portion and the second door panel portion and the hole wall of the installation connecting port. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] FIG1 is a schematic structural diagram of the air volume adjustment assembly provided in the present application from a first perspective.

[0022] FIG. 2 is a schematic diagram of the structure of the channel adjustment plate provided in the present application.

[0023] FIG3 is a schematic diagram of the partial structure of the air volume adjustment assembly provided in the present application from a second viewing angle.

[0024] FIG4 is a schematic structural diagram of the channel adjustment plate provided in the present application in a first state.

[0025] FIG5 is a schematic structural diagram of the channel adjustment plate provided in the present application in the second state.

[0026] FIG6 is a schematic diagram of the structure of the damper plate provided in the present application when it is in a closed state.

[0027] FIG. 7 is a partial enlarged view of point A in FIG. 6 .

[0028] FIG8 is a schematic diagram of the structure of the damper plate provided in the present application when it is in an open state and half-open.

[0029] FIG. 9 is a partial enlarged view of point B in FIG. 8 .

[0030] FIG. 10 is a schematic structural diagram of the damper plate provided in the present application when it is in an open state and fully open.

[0031] FIG. 11 is a partial enlarged view of point C in FIG. 10 .

[0032] FIG. 12 is a schematic diagram of the structure of the damper assembly provided in the present application.

[0033] In the figure:

[0034] 100, box body; 110, installation cavity; 111, installation connection port; 120, installation frame; 130, air inlet; 140, air outlet; 150, insulation layer;

[0035] 200, air volume adjustment component; 210, air outlet cover plate; 211, air outlet hole; 220, channel adjustment plate; 221, adjustment hole; 230, connector;

[0036] 300, damper assembly; 310, actuator; 320, damper plate; 321, first door plate portion; 322, second door plate portion; 330, damper shaft. DETAILED DESCRIPTION

[0037] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0038] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0039] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0042] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0043] The present application provides an environmental test chamber for a large power load, as shown in Figures 1 to 12, the environmental test chamber for a large power load includes a box body 100, a mounting frame 120 and an air volume adjustment component 200, the box body 100 has a mounting cavity 110; the mounting frame 120 is arranged in the mounting cavity 110, and the mounting frame 120 is used to carry a plurality of parts to be tested; the air volume adjustment component 200 is arranged in the mounting cavity 110 and on the air inlet side of the mounting frame 120, the air volume adjustment component 200 includes an air outlet cover plate 210 and a channel adjustment plate 220 connected to each other, the air outlet cover plate 210 is provided with a plurality of air outlet holes 211, and the channel adjustment plate 220 can move relative to the air outlet cover plate 210 to adjust the size of the air outlet holes 211.

[0044] The environmental test chamber for high-power loads is provided with an air volume regulating assembly 200 on the air inlet side of the mounting frame 120, and a plurality of air outlet holes 211 are provided on the air outlet cover plate 210 of the air volume regulating assembly 200. The air flow in the mounting cavity 110 can flow into the mounting frame 120 through the air outlet 140, thereby regulating the experimental temperature of the plurality of parts to be tested carried on the mounting frame 120. A channel regulating plate 220 is connected to the air outlet cover plate 210, and the channel regulating plate 220 can move relative to the air outlet cover plate 210, thereby regulating the size of the air outlet hole 211, and also regulating the size of the air flow passing through the air outlet hole 211. The environmental test chamber for high-power loads provided in the present application is provided with an air volume regulating assembly 200, thereby regulating the air volume on the air inlet side of the mounting frame 120, reducing the influence of the uncontrollable air volume on the experiment, and improving the accuracy of the experiment.

[0045] In some embodiments, as shown in FIGS. 1 to 6 , a plurality of adjustment holes 221 are provided on the channel adjustment plate 220, and the size of the adjustment holes 221 is equal to the size of the air outlet 211; the channel adjustment plate 220 has a first state and a second state, and when in the first state, the adjustment holes 221 are aligned with the air outlet 211, and when in the second state, the adjustment holes 221 are staggered with the air outlet 211, so that the channel adjustment plate 220 blocks a part of the air outlet 211. A plurality of adjustment holes 221 are provided on the channel adjustment plate 220, and the channel adjustment plate 220 is moved. When the channel adjustment plate 220 is in the first state, the adjustment holes 221 are aligned with the air outlet 211 (as shown in FIG. 4 ), at which time the adjustment holes 221 do not block the air outlet 211, and the air outlet 211 is fully opened, and at this time the air intake into the mounting frame 120 through the air outlet 211 is at a maximum. Move the channel adjustment plate 220. When the channel adjustment plate 220 is in the second state, the adjustment hole 221 is staggered with the air outlet 211 (as shown in FIG. 5). At this time, the channel adjustment plate 220 blocks a portion of the air outlet 211. At this time, the amount of air flowing into the mounting frame 120 through the air outlet 211 is relatively small.

[0046] It is understandable that the air intake volume will be different if the area of ​​the air outlet 211 blocked by the channel adjustment plate 220 is of different sizes.

[0047] In some embodiments, as shown in FIGS. 1 to 6 , the connector 230 passes through the channel adjustment plate 220 and is threadedly connected to the air outlet cover plate 210 to connect the channel adjustment plate 220 and the air outlet cover plate 210. After the size of the air outlet hole 211 is adjusted, the channel adjustment plate 220 and the air outlet cover plate 210 are connected by setting the connector 230.

[0048] In some embodiments, the channel adjustment plate 220 can be manually pushed to move relative to the air outlet cover plate 210. After the relative positions of the channel adjustment plate 220 and the air outlet cover plate 210 are adjusted, the channel adjustment plate 220 and the air outlet cover plate 210 are connected via the connector 230.

[0049] In some embodiments, as shown in FIGS. 1 to 6 , the air volume adjustment assembly 200 further includes a driving member, the output end of which is connected to the channel adjustment plate 220, and the driving member can drive the channel adjustment plate 220 to move so as to adjust the relative position between the channel adjustment plate 220 and the air outlet cover plate 210. By providing the driving member, the channel adjustment plate 220 is mechanically pushed to move relative to the air outlet cover plate 210, and after the relative position of the channel adjustment plate 220 and the air outlet cover plate 210 is adjusted, the channel adjustment plate 220 and the air outlet cover plate 210 are connected through the connecting member 230.

[0050] In some embodiments, as shown in Figures 1 to 6, a plurality of channel adjustment plates 220 are provided, and the plurality of channel adjustment plates 220 are connected to the air outlet cover plate 210. By providing a plurality of channel adjustment plates 220, each channel adjustment plate 220 correspondingly adjusts the air intake volume of different areas of the air outlet cover plate 210.

[0051] In some embodiments, each channel adjustment plate 220 is configured with a driving member so that each channel adjustment plate 220 can move independently relative to the air outlet cover plate 210 .

[0052] In some embodiments, the plurality of channel adjustment plates 220 are all controlled uniformly by one driving member.

[0053] In some embodiments, the environmental test chamber for high power load further includes an air volume sensor disposed on the air inlet side of the mounting frame 120, and the air volume sensor is used to detect the air volume on the air inlet side of the mounting frame 120. By installing the air volume sensor on the air inlet side of the mounting frame 120, the air volume on the air inlet side of the mounting frame 120 can be detected, and the relative positions of the channel adjustment plate 220 and the air outlet cover plate 210 are adjusted according to the detection result of the air volume sensor, that is, the air volume on the air inlet side of the mounting frame 120 is adjusted according to the detection result of the air volume sensor.

[0054] Specifically, the mounting frame 120 includes a plurality of bearing plates arranged at intervals along the height direction of the box body 100, and an air volume sensor is installed on the air inlet side of each bearing plate. The bearing plates arranged at intervals along the height direction of the box body 100 can each carry a part to be detected, and an air volume sensor is installed on the air inlet side of each bearing plate, so that the air inlet volume of the corresponding bearing area of ​​each bearing plate can be detected.

[0055] More specifically, two air volume sensors are installed on each carrier plate, and the two air volume sensors are arranged along a first direction, wherein the first direction is perpendicular to the air inlet direction on the carrier plate. The two air volume sensors are arranged at intervals along the first direction, that is, the two air volume sensors are arranged along the width direction of the box body 100, that is, air volume sensors are installed in the front and rear directions of each carrier plate, and the air volume sensors are used to detect the air inlet volume on the front and rear sides of each carrier plate.

[0056] Further, as shown in FIGS. 6 to 12 , the installation cavity 110 is provided with an installation connection port 111; the high-power load environmental test chamber further includes a damper assembly 300, the damper assembly 300 includes an actuator 310 and a damper plate 320 connected thereto, the damper plate 320 has a closed state abutting against the installation connection port 111, and an open state with a gap with the installation connection port 111, and the actuator 310 drives the damper plate 320 to rotate to switch between the closed state and the open state. By providing the damper assembly 300, the actuator 310 of the damper assembly 300 drives the damper plate 320 to rotate, so that the damper plate 320 is in a closed state, at which time the damper plate 320 abuts against the hole wall of the installation connection port 111, thereby blocking the installation connection port 111, limiting the connection between the installation cavity 110 and the outside, and facilitating the rapid increase of the temperature in the installation cavity 110 to meet the experimental requirements. When it is necessary to lower the temperature in the installation cavity 110, the actuator 310 drives the damper plate 320 to rotate so that there is a gap between the damper plate 320 and the installation connecting port 111, so that the damper plate 320 is in the second state. At this time, the high-temperature air in the installation cavity 110 can flow out to the outside through the gap, thereby reducing the temperature in the installation cavity 110.

[0057] Specifically, as shown in Figures 6 to 12, the damper assembly 300 also includes a damper shaft 330 connected to the actuator 310, and the damper plate 320 includes a first door plate portion 321 and a second door plate portion 322 arranged in parallel, the first door plate portion 321 and the second door plate portion 322 are both connected to the damper shaft 330 and are respectively arranged on both sides of the damper shaft 330, and the actuator 310 can drive the damper shaft 330 to rotate to drive the first door plate portion 321 and the second door plate portion 322 to rotate; when in a closed state, the first door plate portion 321 and the second door plate portion 322 are both in contact with the hole wall of the installation connecting port 111, and when in an open state, there is a gap between at least one of the first door plate portion 321 and the second door plate portion 322 and the hole wall of the installation connecting port 111. By providing the damper shaft 330 , not only the output end of the actuator 310 is connected to the damper plate 320 , but also the damper shaft 330 connects the first damper plate portion 321 and the second damper plate portion 322 .

[0058] Specifically, as shown in FIGS. 6 to 12 , the box body 100 is provided with an air inlet 130 and an air outlet 140 that are connected to the installation communication port 111. The air inlet 130 is provided on the box body 100, and the outside air can flow into the installation cavity 110 through the air inlet 130 and the installation communication port 111 in sequence. By providing the air outlet 140, the air in the installation cavity 110 can flow out to the outside through the installation communication port 111 and the air outlet 140.

[0059] It is understandable that when the damper plate 320 is in a closed state, the first door plate portion 321 and the second door plate portion 322 of the damper plate 320 are both in contact with the hole wall of the installation communication port 111, and the air outside the installation communication port 111 cannot flow into the installation cavity 110, and the air inside the installation cavity 110 cannot flow out to the outside. When the damper plate 320 is in an open state, the air outlet 140 and the air inlet 130 are both connected to the installation communication port 111, and the outside air can flow into the installation cavity 110 through the installation communication port 111, and the air inside the installation cavity 110 can also flow out to the outside through the installation communication port 111.

[0060] It should be noted that when the damper plate 320 is in the open state, the different rotation angles of the damper plate 320 result in different air inlet and outlet volumes of the installation cavity 110. As shown in FIGS. 9 and 10 , the damper plate 320 is in the open state, and the damper plate 320 is in a half-open state, and the air inlet and outlet volumes are small at this time. The damper plate 320 is further rotated, as shown in FIGS. 10 and 11 , and the damper plate 320 is in the open state, and the damper plate 320 is in a fully open state, and the air inlet and outlet volumes are maximum at this time.

[0061] Specifically, as shown in FIGS. 6 to 12 , a heat-insulating layer 150 is disposed in the box body 100 , and the heat-insulating layer 150 surrounds and forms the installation cavity 110 .

[0062] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0063] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. An environmental test chamber for high power loads, characterized in that: The environmental test chamber for high power loads includes: The box body (100) has a mounting cavity (110); A mounting frame (120) is disposed in the mounting cavity (110), and the mounting frame (120) is used to carry a plurality of components to be detected; An air volume adjustment component (200) is arranged in the installation cavity (110) and on the air inlet side of the installation frame (120), the air volume adjustment component (200) comprising an air outlet cover plate (210) and a channel adjustment plate (220) connected to each other, the air outlet cover plate (210) being provided with a plurality of air outlet holes (211), and the channel adjustment plate (220) being able to move relative to the air outlet cover plate (210) to adjust the size of the air outlet holes (211).

2. The environmental test chamber for high power load according to claim 1, characterized in that: The channel adjustment plate (220) is provided with a plurality of adjustment holes (221), and the size of the adjustment holes (221) is equal to the size of the air outlet hole (211); The channel adjustment plate (220) has a first state and a second state. When in the first state, the adjustment hole (221) is aligned with the air outlet hole (211). When in the second state, the adjustment hole (221) is staggered with the air outlet hole (211), so that the channel adjustment plate (220) covers a partial area of ​​the air outlet hole (211).

3. The environmental test chamber for high power load according to claim 2, characterized in that: The connecting piece (230) passes through the channel adjustment plate (220) and is threadedly connected to the air outlet cover plate (210) so as to connect the channel adjustment plate (220) and the air outlet cover plate (210).

4. The environmental test chamber for high power load according to claim 2, characterized in that: The air volume adjustment component (200) further comprises a driving member, the output end of which is connected to the channel adjustment plate (220), and the driving member is capable of driving the channel adjustment plate (220) to move so as to adjust the relative position between the channel adjustment plate (220) and the air outlet cover plate (210).

5. The environmental test chamber for high power load according to claim 2, characterized in that: A plurality of the channel adjustment plates (220) are provided, and each of the plurality of channel adjustment plates is connected to the air outlet cover plate (210).

6. The environmental test chamber for high power load according to claim 1, characterized in that: It also includes an air volume sensor arranged on the air inlet side of the mounting frame (120), the air volume sensor being used to detect the air volume at the air inlet side of the mounting frame (120).

7. The environmental test chamber for high power load according to claim 6, characterized in that: The mounting frame (120) comprises a plurality of supporting plates arranged at intervals along the height direction of the box body (100), and the air volume sensor is installed on the air inlet side of each supporting plate.

8. The environmental test chamber for high power load according to claim 7, characterized in that: Two of the air volume sensors are installed on each of the supporting plates, and the two air volume sensors are arranged along a first direction, wherein the first direction is perpendicular to the air inlet direction on the supporting plate.

9. The environmental test chamber for high power load according to claim 1, characterized in that: The installation cavity (110) is provided with an installation communication port (111); The high-power load environmental test chamber further comprises a damper assembly (300), wherein the damper assembly (300) comprises an actuator (310) and a damper plate (320) connected to each other, wherein the damper plate (320) has a closed state abutting against the installation communication port (111), and an open state with a gap between the installation communication port (111), and the actuator (310) drives the damper plate (320) to rotate so as to switch between the closed state and the open state.

10. The environmental test chamber for high power loads according to claim 9, characterized in that: The damper assembly (300) further comprises a damper shaft (330) connected to the actuator (310); the damper plate (320) comprises a first door plate portion (321) and a second door plate portion (322) arranged in parallel; the first door plate portion (321) and the second door plate portion (322) are both connected to the damper shaft (330) and are respectively arranged on two sides of the damper shaft (330); the actuator (310) is capable of driving the damper shaft (330) to rotate, thereby driving the first door plate portion (321) and the second door plate portion (322) to rotate; When in the closed state, the first door panel portion (321) and the second door panel portion (322) are both in contact with the hole wall of the installation connecting port (111); when in the open state, there is a gap between at least one of the first door panel portion (321) and the second door panel portion (322) and the hole wall of the installation connecting port (111).

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