A sound insulation test chamber

Abstract

This invention relates to a soundproof testing chamber in the field of uninterruptible power supply technology. The chamber includes a soundproof chamber body, a base, and a soundproof chamber door. The soundproof chamber body comprises a steel outer shell, an outer soundproof composite layer, an inner soundproof composite layer, and a steel soundproof inner liner. On one hand, sound inside the soundproof testing chamber can be gradually absorbed and attenuated through the steel soundproof inner liner, the inner soundproof composite layer, and the outer soundproof composite layer. On the other hand, sound outside the soundproof testing chamber can also be gradually absorbed and attenuated through the outer soundproof composite layer, the inner soundproof composite layer, and the steel soundproof inner liner, effectively isolating workshop noise. Furthermore, several inner cavity wall dampers are installed inside the hollow vibration damping cavity. The first square tube frame plate and the second square tube frame plate are movably connected through the base wall dampers. This structure can effectively reduce the impact of low-frequency vibrations generated by cylinders, robotic arms, and other mechanical equipment in the workshop on the steel soundproof inner liner within the soundproof chamber body.

Description

Technical Field

[0001] This invention relates to the field of uninterruptible power supply technology, specifically to a soundproof testing chamber. Background Technology

[0002] In recent years, with the rapid development of electronic products, consumers have increasingly higher demands for the quality of these products, making the testing of electronic products more and more complex. Acoustic audio testing is an important part of the functional testing of electronic products. To accurately test the audio performance of electronic products, the testing process needs to be conducted in a soundproof room unaffected by external noise. Soundproof rooms can also be used in fields such as machinery, air conditioning, and medical equipment. Most existing soundproof rooms are constructed of reinforced concrete or gypsum board, requiring the object under test to be placed inside a test chamber for further testing.

[0003] An acoustic testing soundproof box is described in Chinese invention application CN108019061A. The structure includes walls, a top plate, and a bottom plate, which together form a square soundproof chamber. The walls include a front plate, a rear plate, and left and right side plates. A soundproof door is provided on the front plate, comprising an outer soundproof door and an inner soundproof door. The inner surfaces of the walls, top plate, and bottom plate are all provided with protrusions, the dimensions of which are smaller than the outer surface dimensions of the walls, top plate, and bottom plate. Adjacent protrusions can fit together. The walls, top plate, and bottom plate are fixedly connected by bolts. This acoustic testing soundproof box has a simple structure and can effectively isolate outdoor noise.

[0004] However, the aforementioned acoustic testing soundproof box is only suitable for use in relatively quiet environments without low-frequency vibrations, such as soundproof rooms. In production workshops, the presence of numerous cylinders, robotic arms, and other noise sources causes low-frequency vibrations that are transmitted to the acoustic testing soundproof box, affecting the accuracy of acoustic testing. This necessitates making acoustic testing a separate process, rendering the acoustic testing soundproof box unsuitable for production workshops and hindering the seamless integration of product testing and production processes.

[0005] Therefore, there is an urgent need for a soundproof testing chamber to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a sound insulation testing chamber to better solve the technical problem that the presence of a large number of cylinders, robotic arms, linear slides and other noise factors in the production workshop affects the accuracy of acoustic testing of products in the sound insulation testing chamber.

[0007] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0008] A sound insulation test chamber includes a sound insulation chamber body, a base, and a sound insulation chamber door. The sound insulation chamber body is disposed on the top of the base, and the side wall of the sound insulation chamber body has an opening. The sound insulation chamber door is disposed on the side wall of the sound insulation chamber body and can be closed.

[0009] The soundproof chamber includes a steel outer shell, an outer soundproof composite layer, an inner soundproof composite layer, and a steel soundproof inner liner. The interior of the steel soundproof inner liner is a hollow structure for placing the item to be tested. The steel outer shell, the outer soundproof composite layer, and the inner soundproof composite layer are sequentially arranged on the surface of the steel soundproof inner liner from the outside to the inside. A hollow damping cavity is provided between the outer soundproof composite layer and the inner soundproof composite layer. The interior of the hollow damping cavity is provided with several inner cavity wall dampers.

[0010] The base includes a first square tube frame plate and a second square tube frame plate. The first square tube frame plate is located above the second square tube frame plate. The first square tube frame plate and the second square tube frame plate are movably connected by a base wall shock absorber. The first square tube frame plate and the second square tube frame plate have a hollow structure. Sound insulation cotton boards are provided between the first square tube frame plate and the second square tube frame plate and on the top surface of the first square tube frame plate.

[0011] In the above description, as a further embodiment, both the outer and inner sound insulation composite layers have openings at their bottoms. The inner sound insulation composite layer is fixedly connected to the outer wall of the steel sound insulation inner liner through the openings, and the outer sound insulation composite layer is fitted over the inner sound insulation composite layer through the openings. One end of the inner cavity wall damper is fixedly connected to the inner side wall of the outer sound insulation composite layer, and the other end of the inner cavity wall damper is fixedly connected to the outer side wall of the inner sound insulation composite layer. The bottoms of both the outer and inner sound insulation composite layers are fixedly connected to the first square tube frame plate.

[0012] As a further solution, the opening on the side wall of the soundproof chamber is provided with a door frame that matches the soundproof chamber door. The outer wall of the door frame is fixedly connected to the steel shell, the outer soundproof composite layer, the inner soundproof composite layer and the steel soundproof inner liner. The outer wall of the soundproof chamber door is clearance-fitted to the inner wall of the door frame. The soundproof chamber door can be embedded and fixed inside the door frame.

[0013] As a further embodiment of the above description, the door frame is composed of a bent door panel and a cement sealing layer. The two ends of the bent door panel abut against the openings in the side wall of the soundproof chamber, and the cement sealing layer is placed between the bent door panel and the soundproof chamber.

[0014] As a further solution, the inner wall of the steel soundproof inner liner is provided with a microporous mesh layer at the top. The microporous mesh layer is composed of a microporous mesh and sound-absorbing cotton filling. The interior of the microporous mesh has a porous structure, and the sound-absorbing cotton filling is placed inside the microporous mesh.

[0015] As a further solution, the inner wall of the steel soundproof inner liner is provided with a sound-absorbing cotton padding layer. The surface of the sound-absorbing cotton padding layer has several upward-protruding sound-absorbing protrusions, and the protrusions are arranged in a wave-like structure.

[0016] As a further embodiment of the above description, the steel soundproof inner liner is composed of a steel plate, a first gypsum board, a first keel support layer, and a first sound-absorbing cotton layer. The first keel support layer has a frame-shaped hollow structure. The first gypsum board and the steel plate are fixedly connected to the top and bottom surfaces of the first keel support layer in sequence. The first sound-absorbing cotton layer is disposed inside the first keel support layer.

[0017] As a further embodiment of the above description, both the outer and inner sound insulation composite layers are composed of a second gypsum board, a second keel support layer, and a second sound-absorbing cotton layer. The second keel support layer has a frame-shaped hollow structure. The second gypsum board is fixedly connected to the top and bottom surfaces of the second keel support layer, and the second sound-absorbing cotton layer is disposed inside the second keel support layer.

[0018] As a further solution described above, the soundproof cabin door is composed of an outer steel plate, a calcium silicate board, rock wool, a third gypsum board, and an inner steel plate, which are stacked sequentially from the outside to the inside.

[0019] As a further solution, the base is provided with a support frame at the bottom for installation on the ground. The bottom of the support frame has several support feet, which are composed of shock absorbers from the base wall.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] The present application discloses a sound insulation testing chamber. First, the sound insulation chamber body includes a steel outer shell, an outer sound insulation composite layer, an inner sound insulation composite layer, and a steel sound insulation inner liner. On the one hand, the sound inside the sound insulation testing chamber can be gradually absorbed and attenuated through the steel sound insulation inner liner, the inner sound insulation composite layer, and the outer sound insulation composite layer. On the other hand, the sound outside the sound insulation testing chamber can also be gradually absorbed and attenuated through the outer sound insulation composite layer, the inner sound insulation composite layer, and the steel sound insulation inner liner, which can effectively isolate the noise in the workshop.

[0022] Secondly, a hollow isolation structure, known as a "room within a room," is formed between the outer and inner sound insulation composite layers through a hollow vibration damping cavity. Several inner cavity wall dampers are installed inside the hollow vibration damping cavity. The first square tube frame plate and the second square tube frame plate are movably connected through the base wall dampers. The above structure can effectively reduce the impact of low-frequency vibrations generated by cylinders, robotic arms, and other mechanical equipment in the workshop on the steel sound insulation inner liner in the sound insulation chamber. Attached Figure Description

[0023] Figure 1 This is a three-dimensional structural diagram of a sound insulation testing chamber according to the present invention;

[0024] Figure 2 This is a schematic diagram of the internal structure of a sound insulation test chamber according to the present invention;

[0025] Figure 3 for Figure 2 A magnified schematic diagram of the structure of part A in the diagram;

[0026] Figure 4 This is a cross-sectional view of the soundproof chamber door in a soundproof testing chamber according to the present invention;

[0027] Figure 5 This is a cross-sectional structural diagram of the outer sound insulation composite layer and the inner sound insulation composite layer in a sound insulation test chamber according to the present invention;

[0028] Figure 6 This is a cross-sectional view of the steel soundproof inner liner in a soundproof testing chamber according to the present invention.

[0029] Figure 7 This is a schematic cross-sectional view of the door frame structure in a sound insulation test chamber according to the present invention;

[0030] Figure 8 This is a schematic diagram illustrating the sound attenuation effect in a steel soundproof inner liner within a soundproof testing chamber as described in this invention.

[0031] Figure 9 This is a schematic diagram illustrating the attenuation effect of sound propagation into a steel soundproof inner liner in a soundproof testing chamber according to the present invention.

[0032] In the diagram: 1-Soundproof chamber, 11-Steel outer shell, 12-Outer soundproof composite layer, 1201-Second gypsum board, 1202-Second keel support layer, 1203-Second sound-absorbing cotton layer, 13-Hollow vibration damping cavity, 14-Inner soundproof composite layer, 15-Steel soundproof inner liner, 1501-Steel plate, 1502-First gypsum board, 1503-Keel support layer, 1504-First sound-absorbing cotton layer, 2-Soundproof chamber door, 21-Outer steel plate 22-Calcium silicate board, 23-Third sound-absorbing cotton layer, 24-Third gypsum board, 25-Interior steel plate, 3-Base, 31-First square tube frame plate, 32-Second square tube frame plate, 4-Support frame, 41-Support foot, 5-Door frame, 51-Bent door panel, 52-Cement sealing layer, 6-Microporous mesh plate layer, 7-Sound-absorbing cotton pad layer, 71-Sound-absorbing protrusion, 8-Sound insulation cotton board, 9-Inner cavity wall vibration damper, 10-Base wall vibration damper. Detailed Implementation

[0033] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention. The present invention will be described in detail below with reference to the accompanying drawings. The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] Please see Figure 1-9 The specific implementation of the sound insulation test chamber includes a sound insulation chamber body 1, a base 3, and a sound insulation chamber door 2. The sound insulation chamber body 1 is set on the top of the base 3. The side wall of the sound insulation chamber body 1 has an opening. The sound insulation chamber door 2 is closed and set on the side wall of the sound insulation chamber body 1. The sound insulation chamber body 1 includes a steel shell 11, an outer sound insulation composite layer 12, an inner sound insulation composite layer 14, and a steel sound insulation inner liner 15. The interior of the steel sound insulation inner liner 15 is a hollow structure for placing the item to be tested. The steel shell 11, the outer sound insulation composite layer 12, and the inner sound insulation composite layer 14 are sequentially covered on the surface of the steel sound insulation inner liner 15 from the outside to the inside. The bottom of the base 3 is provided with a support frame 4 for setting on the ground. The bottom of the support frame 4 has several support feet 41, which are composed of base wall shock absorbers 10.

[0035] On the one hand, the sound inside the sound insulation test chamber can be gradually absorbed and attenuated through the steel sound insulation inner liner 15, the inner sound insulation composite layer 14 and the outer sound insulation composite layer 12. On the other hand, the sound outside the sound insulation test chamber can also be gradually absorbed and attenuated through the outer sound insulation composite layer 12, the inner sound insulation composite layer 14 and the steel sound insulation inner liner 15. This can effectively reduce the impact of workshop noise on the sound insulation test inside the steel sound insulation inner liner 15.

[0036] Furthermore, a hollow damping cavity 13 is provided between the outer sound insulation composite layer 12 and the inner sound insulation composite layer 14. The hollow damping cavity 13 is provided with several inner cavity wall dampers 9. The base 3 includes a first square tube frame plate 31 and a second square tube frame plate 32. The first square tube frame plate 31 is located above the second square tube frame plate 32. The first square tube frame plate 31 and the second square tube frame plate 32 are movably connected by the base wall damper 10. The space between the first square tube frame plate 31 and the second square tube frame plate 32 is a hollow structure. Sound insulation cotton board 8 is provided between the first square tube frame plate 31 and the second square tube frame plate 32 and on the top surface of the first square tube frame plate 31.

[0037] The outer sound insulation composite layer 12 and the inner sound insulation composite layer 14 are connected by a hollow damping cavity 13 to form a hollow isolation structure of "room within a room". Several inner cavity wall dampers 9 are provided inside the hollow damping cavity 13. The first square tube frame plate 31 and the second square tube frame plate 32 are movably connected by a base wall damper 10. The above structure can effectively reduce the impact of low-frequency vibrations generated by cylinders, robotic arms and other mechanical equipment in the workshop on the steel sound insulation inner liner 15 in the sound insulation chamber 1.

[0038] Specifically, such as Figure 2 and Figure 9 As shown, both the outer sound insulation composite layer 12 and the inner sound insulation composite layer 14 have openings at their bottoms. The inner sound insulation composite layer 14 is fixedly connected to the outer wall of the steel sound insulation inner liner 15 through the openings. The outer sound insulation composite layer 12 is fitted over the inner sound insulation composite layer 14 through the openings. One end of the inner cavity wall damper 9 is fixedly connected to the inner side wall of the outer sound insulation composite layer 12, and the other end of the inner cavity wall damper 9 is fixedly connected to the outer side wall of the inner sound insulation composite layer 14. The bottoms of both the outer sound insulation composite layer 12 and the inner sound insulation composite layer 14 are fixedly connected to the first square tube frame plate 31.

[0039] Both the outer sound insulation composite layer 12 and the inner sound insulation composite layer 14 are sequentially layered onto the surface of the steel sound insulation inner liner 15 through openings. When external noise from the production workshop propagates into the steel sound insulation inner liner 15, it can be gradually attenuated by the blocking effect of the outer sound insulation composite layer 12 and the inner sound insulation composite layer 14, thereby reducing the impact of workshop noise on the sound insulation test inside the steel sound insulation inner liner 15.

[0040] Specifically, such as Figure 2 As shown, the opening on the side wall of the soundproof chamber 1 is provided with a door frame 5 that matches the soundproof chamber door 2. The outer side wall of the door frame 5 is fixedly connected to the steel outer shell 11, the outer soundproof composite layer 12, the inner soundproof composite layer 14 and the steel soundproof inner liner 15. The outer side wall of the soundproof chamber door 2 is clearance-fitted with the inner side wall of the door frame 5. The soundproof chamber door 2 can be embedded and fixed inside the door frame 5.

[0041] The door frame 5 consists of a bent door panel 51 and a cement sealing layer 52. Both ends of the bent door panel 51 abut against the openings in the side wall of the soundproof chamber 1, and the cement sealing layer 52 is positioned between the bent door panel 51 and the soundproof chamber 1. By having the bent door panel 51 abut against the openings of the steel outer shell 11, the outer soundproof composite layer 12, the inner soundproof composite layer 14, and the steel soundproof inner liner 15, and by injecting the cement sealing layer 52 into the side of the bent door panel 51 closest to the soundproof chamber 1, the door frame 5 can be effectively connected and fixed to the soundproof chamber 1. Furthermore, the method of injecting the cement sealing layer 52 into the bent door panel 51 improves the sealing between the door frame 5 and the soundproof chamber 1, reducing the transmission of sound through the air.

[0042] In some specific embodiments, such as Figure 2 As shown, the top of the inner wall of the steel soundproof inner liner 15 is provided with a microporous mesh plate (not shown) layer 6. The microporous mesh plate (not shown) layer 6 is composed of a microporous mesh plate (not shown) and sound-absorbing cotton filling (not shown). The interior of the microporous mesh plate (not shown) has a porous structure, and the sound-absorbing cotton filling (not shown) is placed inside the microporous mesh plate (not shown). The surface and interior of the microporous mesh plate (not shown) have multiple interconnected pore structures, which facilitates the entry of sound from inside the steel soundproof inner liner 15 into the interior of the microporous mesh plate (not shown). At the same time, the sound-absorbing cotton filling (not shown) inside the microporous mesh plate (not shown) has strong sound absorption characteristics, which effectively absorbs sound from inside the steel soundproof inner liner 15 and prevents sound from inside the steel soundproof inner liner 15 from propagating outward.

[0043] In some specific embodiments, such as Figure 2 and Figure 8 As shown, the inner wall of the steel soundproof inner liner 15 is provided with a sound-absorbing cotton padding layer 7. The surface of the sound-absorbing cotton padding layer 7 has several upward-protruding sound-absorbing protrusions 71, which are arranged in a wave-like structure. The sound emitted by the test object inside the steel soundproof inner liner 15 can propagate to the sound-absorbing cotton padding layer 7 on the inner wall of the steel soundproof inner liner 15. The sound can be refracted between the several wave-like sound-absorbing protrusions 71. The sound-absorbing cotton padding layer 7 has strong sound absorption characteristics, and the sound emitted by the test object can be attenuated after multiple refractions, reducing the reverberation of the sound emitted by the test object and affecting the accuracy of the sound insulation test inside the steel soundproof inner liner 15.

[0044] In specific embodiments, such as Figure 6 As shown, the steel soundproof inner liner 15 is composed of a steel plate 1501, a first gypsum board 1502, a first keel support layer 1503, and a first sound-absorbing cotton layer 1504. The first keel support layer 1503 has a frame-shaped hollow structure. The first gypsum board 1502 and the steel plate 1501 are sequentially fixed to the top and bottom surfaces of the first keel support layer 1503. The first sound-absorbing cotton layer 1504 is disposed inside the first keel support layer 1503.

[0045] In specific embodiments, such as Figure 5 As shown, both the outer sound insulation composite layer 12 and the inner sound insulation composite layer 14 are composed of a second gypsum board 1201, a second keel support layer 1202, and a second sound-absorbing cotton layer 1203. The second keel support layer 1202 has a frame-shaped hollow structure. The second gypsum board 1201 is fixedly connected to the top and bottom surfaces of the second keel support layer 1202, respectively. The second sound-absorbing cotton layer 1203 is disposed inside the second keel support layer 1202.

[0046] In specific embodiments, such as Figure 4 As shown, the soundproof door 2 is composed of an outer steel plate, a calcium silicate board, rock wool, a third gypsum board, and an inner steel plate 25. The outer steel plate 21, the calcium silicate board 22, the third sound-absorbing cotton layer 23, the third gypsum board 24, and the inner steel plate 25 are stacked sequentially from the outside to the inside.

[0047] A sound insulation test chamber constructed from the above structure and its cross-sectional structural materials was used to conduct noise tests in an environment simulating external noise levels not exceeding 80 dB. The data from multiple simulated tests are shown in Table 1.

[0048]

[0049] A sound insulation test chamber constructed from the above structure and its cross-sectional structural materials was used to conduct air compressor vibration + dodecahedral acoustic noise tests in an environment where the simulated external noise level did not exceed 80 dB. The data from multiple simulated tests are shown in Table 2.

[0050]

[0051] The above experimental data table shows that a sound insulation effect of over 50 dB can be achieved in both static and dynamic environments, which is only the effect of a preferred embodiment of the present invention.

[0052] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A soundproof testing chamber, comprising a soundproof chamber body, a base, and a soundproof chamber door, wherein the soundproof chamber body is disposed on top of the base, the side wall of the soundproof chamber body has an opening, and the soundproof chamber door is closably disposed on the side wall of the soundproof chamber body, characterized in that: The soundproof chamber includes a steel outer shell, an outer soundproof composite layer, an inner soundproof composite layer, and a steel soundproof inner liner. The interior of the steel soundproof inner liner is a hollow structure for placing the item to be tested. The steel outer shell, the outer soundproof composite layer, and the inner soundproof composite layer are sequentially arranged on the surface of the steel soundproof inner liner from the outside to the inside. A hollow damping cavity is provided between the outer soundproof composite layer and the inner soundproof composite layer. The interior of the hollow damping cavity is provided with several inner cavity wall dampers. The base includes a first square tube frame plate and a second square tube frame plate. The first square tube frame plate is located above the second square tube frame plate. The first square tube frame plate and the second square tube frame plate are movably connected by a base wall shock absorber. The first square tube frame plate and the second square tube frame plate have a hollow structure. Sound insulation cotton boards are provided between the first square tube frame plate and the second square tube frame plate and on the top surface of the first square tube frame plate.

2. The sound insulation testing chamber according to claim 1, characterized in that: Both the outer and inner sound insulation composite layers have openings at their bottoms. The inner sound insulation composite layer is fixedly connected to the outer wall of the steel sound insulation inner liner through the openings. The outer sound insulation composite layer is fitted over the inner sound insulation composite layer through the openings. One end of the inner cavity wall damper is fixedly connected to the inner side wall of the outer sound insulation composite layer, and the other end of the inner cavity wall damper is fixedly connected to the outer side wall of the inner sound insulation composite layer. The bottoms of both the outer and inner sound insulation composite layers are fixedly connected to the first square tube frame plate.

3. The sound insulation testing chamber according to claim 1, characterized in that: The opening on the side wall of the soundproof chamber is provided with a door frame that matches the soundproof chamber door. The outer wall of the door frame is fixedly connected to the steel shell, the outer soundproof composite layer, the inner soundproof composite layer and the steel soundproof inner liner. The outer wall of the soundproof chamber door is clearance-fitted to the inner wall of the door frame. The soundproof chamber door can be embedded and fixed inside the door frame.

4. The sound insulation testing chamber according to claim 3, characterized in that: The door frame is composed of bent door panels and a cement sealing layer. The two ends of the bent door panels abut against the openings in the side wall of the soundproof chamber, and the cement sealing layer is placed between the bent door panels and the soundproof chamber.

5. A sound insulation testing chamber according to any one of claims 1-4, characterized in that: The inner wall of the steel soundproof inner liner is provided with a microporous mesh layer at the top. The microporous mesh layer is composed of a microporous mesh and sound-absorbing cotton filling. The interior of the microporous mesh has a porous structure, and the sound-absorbing cotton filling is placed inside the microporous mesh.

6. A sound insulation testing chamber according to any one of claims 1-4, characterized in that: The inner wall of the steel soundproof inner liner is provided with a sound-absorbing cotton pad, and the surface of the sound-absorbing cotton pad has several upward-protruding sound-absorbing protrusions, which form a wave-like structure.

7. A sound insulation testing chamber according to any one of claims 1-4, characterized in that: The steel soundproof inner liner is composed of a steel plate, a first gypsum board, a first keel support layer and a first sound-absorbing cotton layer. The first keel support layer is a frame-shaped hollow structure. The first gypsum board and the steel plate are fixedly connected to the top and bottom surfaces of the first keel support layer in sequence. The first sound-absorbing cotton layer is located inside the first keel support layer.

8. A sound insulation testing chamber according to any one of claims 1-4, characterized in that: Both the outer and inner sound insulation composite layers are composed of a second gypsum board, a second keel support layer, and a second sound-absorbing cotton layer. The second keel support layer has a frame-shaped hollow structure. The second gypsum board is fixedly connected to the top and bottom surfaces of the second keel support layer, and the second sound-absorbing cotton layer is located inside the second keel support layer.

9. A sound insulation testing chamber according to any one of claims 1-4, characterized in that: The soundproof door is composed of an outer steel plate, a calcium silicate board, rock wool, a third gypsum board, and an inner steel plate, which are stacked sequentially from the outside to the inside.

10. A sound insulation testing chamber according to any one of claims 1-4, characterized in that: The base is provided with a support frame for installation on the ground. The bottom of the support frame has several support feet, which are composed of shock absorbers from the base wall.

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