Anechoic chamber

Abstract

The utility model relates to the technical field of acoustic detection, and particularly discloses an anechoic chamber, which comprises a wall body provided with an opening; the door assembly comprises a first door plate and a second door plate which are sequentially arranged in the first direction, the first door plate and the second door plate are both located in the opening, and the second door plate is close to the ground relative to the first door plate; the ground wedge module is movably arranged on the ground of the anechoic chamber; wherein the second door plate comprises a first sub-part, a second sub-part and a third sub-part, openings of the first sub-part and the third sub-part are located on the two sides of the opening in the second direction and hinged to the wall body, and the second sub-part is movably arranged between the first sub-part and the third sub-part so as to open and close part of the opening. The ground wedge module is arranged to be movable, the indoor floor and the outdoor floor of the anechoic chamber are designed to be flush so that the ground wedge module can move conveniently, meanwhile, the door assembly is designed, the operation convenience is greatly improved while the cost is reduced, and the working efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of acoustic testing technology, and in particular to an anechoic chamber. Background Technology

[0002] An anechoic chamber provides an acoustic environment that meets testing standards for various sound source acoustic testing, analysis, diagnosis, and improvement experiments, and is an important component of the testing system.

[0003] Anechoic chambers are divided into full anechoic chambers and semi-anechoic chambers. Full anechoic chambers have sound-absorbing wedges on all six interior walls, while semi-anechoic chambers do not have wedges on the floor. As a result, full anechoic chambers have more comprehensive sound absorption performance, while semi-anechoic chambers have stronger load-bearing capacity, thus better meeting the testing needs of large equipment.

[0004] In practical use, in order to meet the needs of equipment ranging from small to large, it is generally necessary to build a fully anechoic chamber or a semi-anechoic chamber independently, which is costly. Utility Model Content

[0005] Embodiments of this application provide an anechoic chamber to balance the testing needs of small and large equipment at a lower cost.

[0006] To address the aforementioned technical problems, embodiments of this application disclose the following technical solutions:

[0007] On the one hand, an anechoic chamber is provided, the anechoic chamber having a first direction and a second direction, the anechoic chamber comprising:

[0008] The wall has openings;

[0009] A door assembly includes: a first door panel and a second door panel sequentially arranged in a first direction, both the first and second door panels being located within an opening, and the second door panel being positioned closer to the ground than the first door panel; and

[0010] The ground wedge module is movably installed on the floor of the anechoic chamber;

[0011] The first door panel is hinged to the wall to open and close a portion of the opening. The second door panel includes a first sub-part, a second sub-part, and a third sub-part. The first and third sub-parts are located on both sides of the opening in a second direction and are respectively hinged to the wall. The second sub-part is movably disposed between the first and third sub-parts to open and close a portion of the opening.

[0012] In addition to one or more of the features disclosed above, or as an alternative, the ground wedge module includes a substrate, a first wedge, and a moving wheel, the moving wheel being disposed on the side of the substrate closer to the ground, and the first wedge being disposed on the side of the substrate away from the ground.

[0013] In addition to one or more of the features disclosed above, or alternatively, the ground wedge module also includes a frame disposed on the side of the substrate away from the ground, the frame surrounding the outer periphery of the wedge.

[0014] In addition to one or more of the features disclosed above, or as an alternative, the second sub-part includes a base plate, a mounting frame, a second wedge, and a roller, the mounting frame being disposed on the outer surface of the base plate, the second wedge being disposed within the mounting frame, and the roller being disposed on the side of the base plate near the ground.

[0015] In addition to one or more of the features disclosed above, or alternatively, the mounting frame has a mounting opening facing the anechoic chamber, with the tip of the second wedge pointing toward the mounting opening.

[0016] In addition to one or more of the features disclosed above, or alternatively, the second sub-part also includes: an auxiliary handle disposed at the end of the mounting frame away from the second wedge.

[0017] In addition to one or more of the features disclosed above, or as an alternative, an auxiliary wheel is also included, disposed on the ground side of the first sub-part and / or the ground side of the third sub-part, the auxiliary wheel being in contact with the ground.

[0018] In addition to one or more of the features disclosed above, or as an alternative, a limiting member is also included, disposed on the side of the first sub-part near the second sub-part, and / or disposed on the side of the third sub-part near the second sub-part;

[0019] The limiting member includes a connecting portion and a limiting portion disposed on the connecting portion. The connecting portion is connected to the first sub-part, and the limiting portion is disposed on the side of the connecting portion away from the first sub-part. In the moving direction of the second sub-part, the limiting portion is at least partially opposite to the second sub-part to stop the second sub-part.

[0020] In addition to one or more of the features disclosed above, or as an alternative, a rotating shaft is also included, which is disposed in the anechoic chamber. In the second direction, the rotating shafts of the first sub-part and the third sub-part are both located on opposite sides of the opening in the second direction, and the first sub-part is provided with a clearance angle on the side near the edge of the opening.

[0021] In addition to one or more of the features disclosed above, or as an alternative, the first door panel includes a first sub-door panel portion and a second sub-door panel portion, which are respectively disposed on opposite sides of the opening in the second direction, and both the first sub-door panel portion and the second sub-door panel portion are hinged to the wall.

[0022] One of the above technical solutions has the following advantages or beneficial effects: In this application, the ground wedge module is designed to be movable. When there is a need for testing a full anechoic chamber, the equipment to be tested can be placed normally on the ground wedge module for testing. When there is a need for testing large equipment, the ground wedge module can be removed, thereby leaving a hard ground surface to improve load-bearing capacity, thus enabling conversion between a full anechoic chamber and a semi-anechoic chamber. It is understandable that due to the testing of large equipment, the anechoic chamber is designed to be very large, and the height of the ground wedge module is usually greater than one meter or even two meters. If it is moved manually, it will be very difficult, making the conversion between a full anechoic chamber and a semi-anechoic chamber very troublesome. Designing a movable ground wedge module can effectively alleviate this situation. However, another problem arises. Because the wedge is set on the side of the door assembly facing the inside of the anechoic chamber, the door assembly is thick and can only open inward. In order to avoid the internal ground wedge module blocking the opening of the door assembly, the top of the ground wedge module must be flush with the outside ground, that is, there is a height difference between the inside and outside of the anechoic chamber, making it difficult to remove the ground wedge module. In this application, in addition to designing the ground wedge module to be movable, a door assembly is also designed. When it is necessary to remove the indoor ground wedge module, the first door panel is opened first, opening the space above the entire door assembly. Then, the second sub-section is moved out by the bottom rollers to expose the opening. Then, the operator enters the anechoic chamber through the opening and pushes the ground wedge module out along the opening. After the ground wedge module has been moved out a certain number of times, it will no longer block the first and third sub-sections from opening inward. At this time, the first and third sub-sections are opened inward, thus completing the overall opening of the door assembly. At this point, large equipment can be directly pushed into the anechoic chamber. Finally, the first door panel, the first sub-section, the third sub-section are closed in sequence, and the second sub-section is moved back to its original position to successfully close the entire door assembly. Therefore, in this solution, the ground inside the anechoic chamber is designed to be flush with the outdoor ground to facilitate the movement of the ground wedge module. At the same time, the door assembly is designed so that the second sub-section can be moved open first to leave a gap, and the ground wedge module that blocks the first and third sub-sections can be taken out through the gap in the second sub-section. Until it no longer blocks the opening of the first and third sub-sections, the entire door assembly can be opened, thereby allowing large equipment to enter and exit. This greatly improves the ease of operation and work efficiency while reducing costs. Attached Figure Description

[0023] The technical solution and other beneficial effects of this application will become apparent from the following detailed description of specific embodiments in conjunction with the accompanying drawings.

[0024] Figure 1 This is an overall structural diagram of the anechoic chamber with outer door frame provided in the embodiments of this application;

[0025] Figure 2 This is an overall structural diagram of the anechoic chamber provided in the embodiments of this application;

[0026] Figure 3 This is a top view of the first door panel removed, provided in an embodiment of this application;

[0027] Figure 4 This is a top view of the embodiment of this application with a first door panel and the ground wedge module removed;

[0028] Figure 5 This is provided by the embodiments of this application. Figure 4 A magnified view of part A in the image;

[0029] Figure 6 This is an overall structural diagram of the ground wedge module provided in an embodiment of this application;

[0030] Figure 7 This is an overall structural diagram provided in an embodiment of this application to illustrate the second sub-part.

[0031] Explanation of reference numerals in the attached figures:

[0032] 100. Anechoic chamber; 110. Door assembly; 111. First door panel; 1111. First sub-door panel; 1112. Second sub-door panel; 112. Second door panel; 1121. First sub-part; 1122. Second sub-part; 112a. Base plate; 112b. Mounting frame; 112c. Second wedge; 112d. Roller; 112e. Auxiliary handle; 112f. Mounting opening; 1123. Three sub-sections; 113, First outer door; 114, Second outer door; 120, Ground wedge module; 121, Base plate; 122, First wedge; 123, Moving wheel; 124, Enclosure frame; 130, Auxiliary wheel; 140, Limiting component; 141, Connecting part; 142, Limiting part; 150, Rotating shaft; 160, Avoidance angle; 170, Wall; 171, Opening; 200, Ground surface; 300, Outer door frame. Detailed Implementation

[0033] To make the objectives, technical solutions, and beneficial effects of this application clearer, the following detailed description, in conjunction with the accompanying drawings and specific embodiments, further illustrates this application. It should be understood that the specific embodiments described in this specification are merely for explaining this application and are not intended to limit it.

[0034] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection, a direct connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0037] To address the aforementioned problems, in the embodiments of this application, reference is made to... Figures 1-4 This application provides an anechoic chamber 100, which has a first direction Z, a second direction X, and a third direction Y that intersect each other. Alternatively, the anechoic chamber 100 may have a first direction Z, a second direction X, and a third direction Y that are perpendicular to each other. Here, "perpendicular" refers to a state where the angle formed by two lines, a line and a surface, or a surface is 89° to 91°.

[0038] For example, the first direction Z is the height direction, the second direction X is the width direction, and the third direction Y is the length direction.

[0039] To explain this solution more clearly, the description will focus on the ground surface 200 and the outer door frame 300. The ground surface 200 is parallel to the ground inside the anechoic chamber 100, and the outer door frame 300 is located outside the opening 171.

[0040] Specifically, the anechoic chamber 100 includes walls 170, door components 110, and floor wedge modules 120.

[0041] Specifically, the wall 170 is provided with an opening 171; for example, in this application, the wall 170 is provided with five sides, and the opening 171 is provided on one of the walls 170. The door assembly 110 includes: a first door panel 111 and a second door panel 112 arranged sequentially in the first direction Z, both the first door panel 111 and the second door panel 112 are located within the opening 171, and the second door panel 112 is arranged relative to the first door panel 111 and closer to the ground; the ground wedge module 120 is movably disposed on the floor of the anechoic chamber.

[0042] Specifically, the first door panel 111 is hinged to the opening 171 of the wall 170 to open and close part of the opening 171. The second door panel 112 includes a first sub-part 1121, a second sub-part 1122, and a third sub-part 1123 in the second direction X. The openings 171 of the first sub-part 1121 and the third sub-part 1123 are located on both sides of the opening 171 in the second direction X and are respectively hinged to the wall 170. The second sub-part 1122 is movably disposed between the first sub-part 1121 and the third sub-part 1123 to open and close part of the opening 171.

[0043] To achieve the above technical solution, the ground wedge module 120 is designed to be movable. When there is a need for testing a full anechoic chamber, the equipment to be tested can be placed normally on the ground wedge module 120 for testing. When there is a need for testing large equipment, the ground wedge module 120 can be removed, thereby leaving a hard ground to improve the load-bearing capacity, thus realizing the conversion of the anechoic chamber 100 between a full anechoic chamber and a semi-anechoic chamber.

[0044] Understandably, due to the testing of large equipment, the anechoic chamber 100 is designed to be very large, and the height of the ground wedge module 120 is usually greater than one meter or even two meters. Manual handling would be extremely difficult, making the conversion between a full anechoic chamber and a semi-anechoic chamber very troublesome. Designing a movable ground wedge module 120 can effectively alleviate this situation. However, this leads to another problem: because the wedge is set on the side of the door assembly 110 facing the inside of the anechoic chamber 100, the door assembly 110 is quite thick and can only open inwards. To avoid the internal ground wedge module 120 obstructing the opening of the door assembly 110, the top of the ground wedge module 120 must be flush with the outside ground, meaning there is a height difference between the inside and outside of the anechoic chamber 100, making the ground wedge module 120 difficult to remove. In this application, in addition to designing the ground wedge module 120 to be movable, the door assembly 110 is also designed. When it is necessary to remove the indoor floor wedge module 120, first open the first door panel 111 to open the space above the entire door assembly 110. Then, move the second sub-part 1122 out through the bottom rollers 112d to expose part of the opening 171. Then, the operator enters the anechoic chamber 100 through the opening 171 and pushes the floor wedge module 120 out along the opening 171. After the floor wedge module 120 has been moved out a certain number of times, it will no longer block the first sub-part 1121 and the third sub-part 1123 from opening inward. At this time, open the first sub-part 1121 and the third sub-part 1123 inward to complete the overall opening of the door assembly 110. At this time, large equipment can be directly pushed into the anechoic chamber 100. Finally, close the first door panel 111, the first sub-part 1121, the third sub-part 1123 in sequence, and finally move the second sub-part 1122 back to its original position to successfully close the entire door assembly 110. Therefore, in this solution, the indoor and outdoor ground of the anechoic chamber 100 are designed to be flush to facilitate the movement of the ground wedge module 120. At the same time, the door assembly 110 is designed so that the second sub-section 1122 can be moved open to leave a partial opening 171. The ground wedge module 120, which is blocking the first sub-section 1121 and the third sub-section 1123, can be taken out through the gap in the second sub-section 1122. Until it no longer blocks the opening of the first sub-section 1121 and the third sub-section 1123, the entire door assembly 110 can be fully opened, thereby allowing large equipment to enter and exit. This greatly improves the ease of operation and work efficiency while reducing costs.

[0045] Reference Figure 3 and Figure 4 A first outer door 113 and a second outer door 114 are also provided on the wall 170 with the opening 171. The first outer door 113 and the second outer door 114 are used to further achieve the protective function.

[0046] In some embodiments, refer to Figure 2 and Figure 6The ground wedge module 120 includes a base plate 121, a first wedge 122 and a moving wheel 123. The moving wheel 123 is disposed on the side of the base plate 121 close to the ground, and the first wedge 122 is disposed on the side of the base plate 121 away from the ground.

[0047] Specifically, the ground wedge module 120 also includes a frame 124, which is disposed on the side of the substrate 121 away from the ground and surrounds the outer periphery of the wedge.

[0048] In some embodiments, the caster wheel 123 is a self-locking omnidirectional wheel, which can fix the ground wedge module 120 when it is moved to a certain position, thereby improving the stability of the ground wedge module 120 and making it easier for operators to operate.

[0049] To achieve the above technical solution, a specific structure of a ground wedge module 120 is proposed. The ground wedge module 120 is modularly set, and each module is independent and easy to operate. Personnel only need to push the frame 124 to easily push the ground wedge module 120. The frame 124 can also provide protection and reduce frictional damage between the first wedges 122.

[0050] In some embodiments, refer to Figure 2 and Figure 7 The second sub-part 1122 includes a base plate 112a, a mounting frame 112b, a second wedge 112c, and a roller 112d. The mounting frame 112b is disposed on the outer surface of the base plate 112a, the second wedge 112c is disposed inside the mounting frame 112b, and the roller 112d is disposed on the side of the base plate 112a near the ground.

[0051] Specifically, the mounting frame 112b has a mounting opening 112f facing into the anechoic chamber 100, and the tip of the second wedge 112c is positioned pointing towards the mounting opening 112f.

[0052] Understandably, if the mounting port 112f faces upwards, the larger size of the second sub-part 1122 would make it difficult to install the second wedge 112c.

[0053] To achieve the above technical solution, the second sub-part 1122 is made into a trolley structure, which is convenient for operators to operate. The mounting port 112f of the mounting frame 112b is set to the side, which facilitates the installation and disassembly of the second wedge 112c and improves the ease of operation.

[0054] It should be noted that in some embodiments, the second sub-part 1122 further includes an auxiliary handle 112e, which is located at the end of the mounting frame 112b away from the second wedge 112c, to facilitate the operator's gripping and operation.

[0055] For example, in this application, considering the stability of the second sub-part 1122 during movement, a counterweight structure can be provided on the base plate 112a to lower the center of gravity of the second sub-part 1122, thereby ensuring stability and safety during movement.

[0056] In some embodiments, the maximum dimension of the second sub-part 1122 in the first direction Z is greater than the maximum dimension of the ground wedge module 120 in the first direction Z, so as to facilitate the transport of the ground wedge module 120 from the notch located in the second sub-part 1122. For example, in this application, taking into account the height of the personnel transporting the ground wedge module 120, the maximum dimension of the second sub-part 1122 in the first direction Z is at least 2m.

[0057] The maximum dimension of the second sub-part 1122 in the second direction X is greater than the maximum dimension of the ground wedge module 120 in the second direction X. For example, in this application, considering the aesthetics of the door assembly 110 arrangement, the maximum dimension of the second sub-part 1122 in the second direction X is an integer multiple of the maximum dimension of the ground wedge module 120 in the second direction X, so as to facilitate the transport of the ground wedge module 120 from the notch located in the second sub-part 1122.

[0058] Back Figures 2-4 As one of the optional embodiments of this solution, the door assembly 110 also includes an auxiliary wheel 130. The auxiliary wheel 130 can be disposed on the side of the first sub-part 1121 near the ground, and the auxiliary wheel 130 can also be disposed on the side of the second sub-part 1122 near the ground. The auxiliary wheel 130 is in contact with the ground.

[0059] To achieve the above technical solution, the auxiliary wheel 130 enables the first sub-part 1121 or the third sub-part 1123 to have rolling friction with the ground, thereby reducing the force required to open and close the door and improving convenience.

[0060] In some embodiments, the anechoic chamber 100 further includes a rotating shaft 150 disposed within the anechoic chamber 100. In the second direction X, the rotating shafts 150 of the first sub-part 1121 and the third sub-part 1123 are both located on opposite sides of the opening 171 in the second direction X. The first sub-part 1121 is provided with a clearance angle 160 on the side near the edge of the opening 171.

[0061] It should be noted that the inner wall of the wall 170, where the opening 171 is located in the anechoic chamber 100, is also equipped with a sound-absorbing wedge. When the door assembly 110 opens inward, the wedge on the door assembly 110 will collide with the wedge on the inner wall of the wall 170. In order to ensure smooth opening, both the wedge on the door assembly 110 and the wedge on the inner wall of the wall 170 are provided with a clearance angle 160. The sum of the clearance angle 160 of the wedge on the door assembly 110 and the clearance angle 160 of the wedge on the inner wall of the wall 170 is ninety degrees. This makes the inward opening angle of the door assembly 110 exactly ninety degrees, avoiding obstruction of the wedge transportation and collision with the ground wedge module 120 due to the impact force when the second sub-part 1122 is reset, thus ensuring the safety of the staff.

[0062] In some embodiments, the opening and closing of the door assembly 110 can be manually controlled by a staff member.

[0063] In some embodiments, the opening angle of the door assembly 110 can also be controlled by an automatic door opening device. For example, the first door panel 111 includes a first sub-door panel portion 1111 and a second sub-door panel portion 1112, which are respectively disposed on opposite sides of the opening 171 in the second direction X, and both the first sub-door panel portion 1111 and the second sub-door panel portion 1112 are hinged to the wall 170. A pneumatic control device, such as a cylinder, is provided in the anechoic chamber 100. The cylinder has a stroke limit, thereby ensuring that the opening angle of the door assembly 110 is controllable in real time, while effectively reducing the physical labor of the operator.

[0064] Reference Figure 4 and Figure 5 To achieve the above technical solution, the first sub-part 1121 and the third sub-part 1123 abut against the walls 170 of the anechoic chamber 100 on both sides of the opening 171 when closed, thereby preventing the first sub-part 1121 and the third sub-part 1123 from opening outward and ensuring the stability of the first sub-part 1121 and the third sub-part 1123 when closed. The design of the avoidance angle 160 is conducive to the smooth opening of the first sub-part 1121 and the third sub-part 1123.

[0065] In some embodiments, the first door panel 111 and the second door panel 112 are spaced apart in the first direction Z, and the distance between the first door panel 111 and the second door panel 112 in the first direction Z is not less than 50mm, so as to ensure that the first door panel 111 and the second door panel 112 can be opened or closed independently without interfering with each other.

[0066] The first sub-part 1121 and the second sub-part 1122 are spaced apart in the second direction X, and the distance between the first sub-part 1121 and the second sub-part 1122 in the second direction X is not less than 25mm, so as to ensure that the first sub-part 1121 and the second sub-part 1122 can be opened or closed independently without interfering with each other.

[0067] The third sub-part 1123 and the second sub-part 1122 are spaced apart in the second direction X, and the distance between the third sub-part 1123 and the second sub-part 1122 in the second direction X is not less than 25mm, so as to ensure that the third sub-part 1123 and the second sub-part 1122 can be opened or closed independently without interfering with each other.

[0068] In some embodiments, both the first sub-part 1121 and the third sub-part 1123 are provided with handles to facilitate workers to open or close the first sub-part 1121 and the third sub-part 1123 using the handles.

[0069] In some embodiments, the anechoic chamber 100 further includes a limiting member 140, which may be disposed on the side of the first sub-part 1121 near the second sub-part 1122, and the limiting member 140 may also be disposed on the side of the third sub-part 1123 near the second sub-part 1122.

[0070] Specifically, the limiting member 140 includes a connecting portion 141 and a limiting portion 142 disposed on the connecting portion 141. The connecting portion 141 is connected to the first sub-part 1121, and the limiting portion 142 is disposed on the side of the connecting portion 141 away from the first sub-part 1121. In the moving direction of the second sub-part 1122, the limiting portion 142 is at least partially opposite to the second sub-part 1122 to stop the second sub-part 1122.

[0071] In this embodiment, the limiting member 140 is L-shaped, with the connecting part 141 perpendicular to the first sub-part 1121 and the limiting part 142 perpendicular to the connecting part 141. Thus, when the first sub-part 1121 or the second sub-part 1122 is fully opened, it forms a 90-degree angle. When the operator closes the door assembly 110, the final step is to push the second sub-part 1122 to block the opening. The limiting member 140 on the first sub-part 1121 or the third sub-part 1123 can act as a barrier to the second sub-part 1122. The operator can determine that the second sub-part 1122 has reached the corresponding position by pushing the second sub-part 1122 until it contacts the limiting part 142. This effectively reduces the workload of the operator, ensures the stability of the second sub-part 1122's position, and prevents the second sub-part 1122 from impacting the ground wedge module 120 and causing damage to it.

[0072] The above steps are provided only to help understand the method, structure, and core ideas of this application. Those skilled in the art can make various improvements and modifications to this application without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. An anechoic chamber, characterized in that, The anechoic chamber has intersecting first and second directions, and the anechoic chamber includes: The wall has openings; A door assembly includes: a first door panel and a second door panel sequentially arranged in a first direction, both the first door panel and the second door panel being located within the opening, and the second door panel being positioned closer to the ground relative to the first door panel; and A ground wedge module is movably installed on the floor of the anechoic chamber; The first door panel is hinged to the wall to open and close part of the opening. The second door panel includes a first sub-part, a second sub-part, and a third sub-part. The first sub-part and the third sub-part are located on both sides of the opening in the second direction and are respectively hinged to the wall. The second sub-part is movably disposed between the first sub-part and the third sub-part to open and close part of the opening.

2. The anechoic chamber as described in claim 1, characterized in that, The ground wedge module includes a base plate, a first wedge, and a moving wheel. The moving wheel is disposed on the side of the base plate close to the ground, and the first wedge is disposed on the side of the base plate away from the ground.

3. The anechoic chamber as described in claim 2, characterized in that, The ground wedge module also includes a frame, which is disposed on the side of the substrate away from the ground and surrounds the outer periphery of the first wedge.

4. The anechoic chamber as described in claim 1, characterized in that, The second sub-part includes a base plate, a mounting frame, a second wedge, and rollers. The mounting frame is disposed on the outer surface of the base plate, the second wedge is disposed inside the mounting frame, and the rollers are disposed on the side of the base plate near the ground.

5. The anechoic chamber as described in claim 4, characterized in that, The mounting frame has a mounting opening facing the anechoic chamber, and the tip of the second wedge is positioned pointing towards the mounting opening.

6. The anechoic chamber as described in claim 5, characterized in that, The second sub-part also includes an auxiliary handle, located at the end of the mounting frame away from the second wedge.

7. The anechoic chamber as described in claim 1, characterized in that, It also includes auxiliary wheels, which are disposed on the side of the first sub-part close to the ground and / or the side of the third sub-part close to the ground, and the auxiliary wheels are in contact with the ground.

8. The anechoic chamber as described in claim 1, characterized in that, It also includes a limiting member disposed on the side of the first sub-part near the second sub-part, and / or disposed on the side of the third sub-part near the second sub-part; The limiting member includes a connecting portion and a limiting portion disposed on the connecting portion. The connecting portion is connected to the first sub-part, and the limiting portion is disposed on the side of the connecting portion away from the first sub-part. In the moving direction of the second sub-part, the limiting portion is at least partially opposite to the second sub-part to stop the second sub-part.

9. The anechoic chamber as described in claim 1, characterized in that, It also includes a rotating shaft disposed in the anechoic chamber. In the second direction, the rotating shafts of the first sub-part and the third sub-part are both located on opposite sides of the opening in the second direction. The first sub-part and / or the third sub-part are provided with a clearance angle on the side near the edge of the opening.

10. The anechoic chamber as described in claim 1, characterized in that, The first door panel includes a first sub-door panel portion and a second sub-door panel portion, which are respectively disposed on opposite sides of the opening in the second direction, and both the first sub-door panel portion and the second sub-door panel portion are hinged to the wall.

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