CN213025380U - Portable adjustable head sound absorption and insulation cover - Google Patents
Portable adjustable head sound absorption and insulation cover Download PDFInfo
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- CN213025380U CN213025380U CN202022170284.2U CN202022170284U CN213025380U CN 213025380 U CN213025380 U CN 213025380U CN 202022170284 U CN202022170284 U CN 202022170284U CN 213025380 U CN213025380 U CN 213025380U
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Abstract
The utility model provides a head sound absorption and insulation cover with adjustable it is portable. This sound proof cover is inhaled to portable adjustable head includes inhales the sound insulation piece by the lower part, the sound insulation piece is inhaled on upper portion, the sound insulation piece is inhaled at the top and outside flip inhales the sound insulation piece and encloses the cover body of establishing formation, the cover body has the appearance chamber that is suitable for human head, be equipped with the local opening of being convenient for human breathing and activity in the outside below of the cover body, the sound insulation piece is inhaled on upper portion, the sound insulation piece is inhaled at the top and outside flip inhales between the sound insulation piece articulated and the nested setting each other, the sound insulation piece is inhaled in the lower part to upper portion, the sound insulation piece is inhaled in the top can shrink to inhale the sound insulation piece local overlapping with upper portion, outside flip inhales the sound insulation piece and can overturn and contract to inhale the sound insulation piece local overlapping with the top, inhale the sound insulation piece in the lower part. The head sound absorption and insulation cover has the advantages of portability, adjustability, remarkable sound absorption and insulation effect and the like.
Description
Technical Field
The utility model belongs to the technical field of making an uproar falls in indoor local environment and specifically relates to a head sound absorption and insulation cover with adjustable it is portable.
Background
With the continuous development of modern society, various noise sources such as traffic, social life, building construction, indoor household appliances and the like increasingly influence the daily life of people, particularly interfere the normal rest of people, seriously influence the sleep quality of people, even cause a series of diseases such as neurasthenia, insomnia, hypertension, endocrine disorders and the like, and bring negative effects to work, life and study.
How to effectively eliminate the noise interference and ensure and improve the sleep quality is a problem to be solved urgently in the modern society.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a head sound absorption and insulation cover with adjustable it is portable, this head sound absorption and insulation cover has advantages such as portable, adjustable, inhale the sound insulation effect and show.
The utility model provides a sound-proof cover is inhaled to head with adjustable it is portable, include and inhale the sound insulation piece by the lower part, sound insulation piece is inhaled on upper portion, the top is inhaled sound insulation piece and outside flip and is inhaled the sound insulation piece and enclose the cover body of establishing formation, the cover body has the appearance chamber that is suitable for human head, outside below at the cover body is equipped with the local opening of being convenient for human breathing and activity, sound insulation piece is inhaled on upper portion, sound insulation piece and outside flip are inhaled at the top and inhale mutual articulated and nested setting between the sound insulation piece, sound insulation piece top is inhaled in the lower part to upper portion is inhaled the sound insulation piece and is fixed, sound insulation piece can shrink to inhale sound insulation piece local overlapping with upper portion in the top, outside flip inhales the sound insulation piece and can overturn and contract to inhale sound insulation piece local overlapping with the top, inhale sound insulation piece in the lower part, sound insulation.
Furthermore, the lower sound absorption and insulation piece, the upper sound absorption and insulation piece, the top sound absorption and insulation piece and the outer turnover cover sound absorption and insulation piece are respectively provided with a cambered surface shell, and the sound absorption and insulation layer is arranged on the inner side of the cambered surface shell.
Furthermore, a breathable facing layer is arranged on the outer side of the sound absorption and insulation layer, and a damping layer is arranged on the inner side of the sound absorption and insulation layer.
Further, a low-speed micro fan is arranged on the inner side of the cover body.
Furthermore, an air inlet silencing pipeline is arranged on the cover body, an air inlet of the air inlet silencing pipeline is communicated with the outside, and an air outlet of the air inlet silencing pipeline is communicated with the low-speed micro fan.
Furthermore, the cover body is provided with a distributed air supply channel, the distributed air supply channel is pre-buried and distributed in the cover body, an air inlet of the distributed air supply channel is communicated with an air outlet of the low-speed micro fan, and an air outlet of the distributed air supply channel is communicated with the accommodating cavity through a hole formed in the inner side of the cover body.
Further, the utility model discloses a sound-proof cover is inhaled to portable adjustable head still includes spacer pin and spacing piece, the spacer pin is worn to locate upper portion and is inhaled sound insulation piece, top and inhale sound insulation piece and outside flip and inhale between the sound insulation piece, spacing piece is fixed at the both ends of spacer pin.
Furthermore, the upper sound absorption and insulation piece, the top sound absorption and insulation piece and the outer flip sound absorption and insulation piece are nested and hooked to limit each other through the limit shoulder and the limit hanging shoulder.
Furthermore, an LED reading lamp and/or a charging device with a USB interface are/is arranged on the cover body.
Furthermore, a flip cover handle is arranged below the outer flip cover sound absorption and insulation piece.
The portable adjustable head sound absorption and insulation cover of the utility model is suitable for sleeping on a couch, has suitable structure and size, keeps local openings on the reverse side of the body due to unstable thinking when the user just begins to fall asleep, and has the characteristics of portability, convenient movement, good sealing performance and air permeability, suitability for modular manufacture and assembly and the like; meanwhile, the upper sound absorption and insulation piece, the top sound absorption and insulation piece and the outer flip sound absorption and insulation piece are arranged in a mutually hinged and nested mode, so that the opening and closing degree of the cover body is adjustable, and the cover is more convenient to use. Through field measurement, the sound absorption and insulation effect of the head sound absorption and insulation cover is remarkable, the acoustic environment under the prone sleeping condition can be greatly improved, the interference of surrounding environment noise is eliminated, the sleeping is promoted, and the efficiency of entering deep sleeping from superficial sleeping is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural view of a portable adjustable head sound-absorbing and sound-insulating cover according to an embodiment of the present invention;
fig. 2 is a schematic structural view of a lower sound absorption and insulation member according to an embodiment of the present invention;
fig. 3 is a schematic view of an inner side structure of an upper sound absorption and insulation member according to an embodiment of the present invention;
fig. 4 is a schematic outer side view of an upper sound absorption and insulation member according to an embodiment of the present invention;
fig. 5 is a schematic structural view of a top sound absorption and insulation member according to an embodiment of the present invention;
fig. 6 is a schematic structural view of an outside flip sound absorption and insulation member according to an embodiment of the present invention;
FIG. 7 is a schematic sectional view taken along line A-A of FIG. 5;
fig. 8 is a schematic view of a hinge structure according to an embodiment of the present invention;
fig. 9 is a schematic view of an arrangement structure of a sound absorption and insulation layer according to an embodiment of the present invention;
FIG. 10 is a comparison graph of noise spectra at 0.1m measuring points outside the left and right auricles with or without the portable adjustable head sound-absorbing and insulating cover;
FIG. 11 is a comparison graph of noise reduction effect at 0.1m measuring point outside the left and right auricles with or without the portable adjustable head sound-absorbing and insulating cover.
Description of reference numerals:
1: the outer side flip sound absorption and insulation piece; 2: a sound absorbing and insulating member at the top; 3: an upper sound absorbing and insulating member; 4: a lower sound absorption and insulation member; 5: a spacing pin; 6: a limiting sheet; 7: a limiting hanging shoulder; 8: a limiting shoulder; 9: a pore; 10: an LED reading lamp; 11: a low speed micro fan; 12: a flip-top handle; 13: a charging device with a USB interface; 14: a breathable facing layer; 15: a sound absorption and insulation layer; 16: a damping layer; 17: a cambered surface housing; 18: an air inlet silencing pipeline; 19: distributed air supply channels.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 9, the portable adjustable head sound absorption and insulation cover of the present invention comprises a cover body formed by a lower sound absorption and insulation member 4, an upper sound absorption and insulation member 3, a top sound absorption and insulation member 2 and an outer side flip sound absorption and insulation member 1, wherein the cover body has a cavity suitable for the head of a human body, a local opening convenient for human breathing and movement is arranged below the outer side of the cover body, the upper sound absorption and insulation piece 3, the top sound absorption and insulation piece 2 and the outer side flip sound absorption and insulation piece 1 are hinged and nested, the upper sound absorption and insulation piece 3 is fixed above the lower sound absorption and insulation piece 4, the top sound absorption and insulation piece 2 can be contracted to be partially overlapped with the upper sound absorption and insulation piece 3, the outer side flip sound absorption and insulation piece 1 can be overturned and contracted to be partially overlapped with the top sound absorption and insulation piece 2, and sound absorption and insulation layers 15 are arranged on the inner sides of the lower sound absorption and insulation piece 4, the upper sound absorption and insulation piece 3, the top sound absorption and insulation piece 2 and the outer turnover cover sound absorption and insulation piece 1.
As shown in fig. 2, the lower sound absorption and insulation member 4 is a base enclosure sound absorption and insulation member, and has an inner sound absorption and insulation plate and sound absorption and insulation enclosing plates oppositely arranged at two sides of the inner sound absorption and insulation plate, a local opening for human breathing and activity is formed below the two sound absorption and insulation enclosing plates, and a sound absorption and insulation layer 15 is arranged in a cavity of the lower sound absorption and insulation member 4.
As shown in fig. 3 and 4, the upper sound absorbing and insulating member 3 is an inner acute-angle sound absorbing and insulating member, and has a corner for connecting the lower sound absorbing and insulating member 4 and the top sound absorbing and insulating member 2, and the corner is an acute angle; it can be understood that the lower end of the upper sound absorption and insulation piece 3 is matched with the upper end of the lower sound absorption and insulation piece 4, so that the lower sound absorption and insulation piece 4 can be conveniently and well fixed above the lower sound absorption and insulation piece 4, and the lower sound absorption and insulation piece 4 and the upper sound absorption and insulation piece 3 jointly form an inner side sound absorption and insulation piece; the fixing modes of the two are not strictly limited, and a proper fixing mode can be adopted according to actual needs.
As shown in fig. 5, the top sound absorbing and insulating member 2 is a middle acute angle flip sound absorbing and insulating plate, which is mainly disposed on the top of the sound absorbing and insulating cover, and has a corner for connecting the upper sound absorbing and insulating member 3 with the outer flip sound absorbing and insulating member 1, and the corner is also an acute angle.
As shown in fig. 6, the outside flip sound absorption and insulation member 1 is arranged outside the sound absorption and insulation cover in a reversible manner; the upper end of the outside flip sound absorption and insulation piece 1 is hinged to the top sound absorption and insulation piece 2, and the outside flip sound absorption and insulation piece 1 is hermetically arranged at the lower part of the outside flip sound absorption and insulation piece 4, the upper part of the outside flip sound absorption and insulation piece 3 and the top sound absorption and insulation piece 2 to enclose the outer side of a cavity formed.
Under the above-mentioned mode of setting, enclose between each inhale the sound insulation piece and establish and form and can provide comparatively airtight sound insulation space for the prone position rest personnel, inhale the local opening of sound insulation 4 the place ahead downside through setting up in the lower part, make it be suitable for when the prone position rest personnel shoulder neck horizontal put and upset, when utilizing this to inhale the sound insulation cover noise elimination and fall the noise, ensure the normal breathing of the oronasal of the sleeper and spit gas.
The utility model does not strictly limit the concrete shape and structure of the lower sound absorption and insulation piece 4, the upper sound absorption and insulation piece 3, the top sound absorption and insulation piece 2 and the outer flip sound absorption and insulation piece 1; it can be understood that each of the arc-shaped housings 17 is provided with a sound absorption and insulation layer 15 to eliminate the interference of surrounding environment noise, so as to ensure the sound absorption and insulation effect of the head sound absorption and insulation cover.
The sound absorption and insulation layer 15 is mainly used for absorbing and isolating external noise, is not strictly limited, and can be made of a conventional sound absorption and insulation material in the field; furthermore, a breathable facing layer 14 may be provided on the outside (i.e., the side facing the cavity) of the sound absorption and insulation layer 15, and a damping layer 16 may be provided on the inside of the sound absorption and insulation layer 15.
More specifically, as shown in fig. 9, each sound absorption and insulation member is composed of a cambered surface outer shell 17, a damping layer 16, a sound absorption and insulation layer 15 and a breathable facing layer 14 which are sequentially arranged from outside to inside; the damping layer 16 may be made of conventional damping materials and the air-permeable facing layer 14 may be composed of a perforated facing layer or a porous woven air-permeable facing layer 14 having apertures 9 for air permeability. The parameters such as the geometric dimension, the size, the mesh number, the perforation rate and the like of the pore structure arranged on the breathable facing layer 14 and the pore diameter of the porous weaving pores are not strictly limited, and can be designed and adjusted according to the specific sound absorption and insulation performance requirements.
As shown in fig. 3, in the present invention, a low-speed micro-fan 11 may be provided inside the cover body as needed; the position of the low-speed micro fan 11 on the cover is not limited, and may be provided inside the upper sound absorbing/insulating member 3, for example.
In addition, as shown in fig. 4, an air inlet muffling pipeline 18 may be disposed on the cover body, an air inlet of the air inlet muffling pipeline 18 may be communicated with the outside, and an air outlet of the air inlet muffling pipeline 18 may be communicated with the low-speed micro fan 11, so as to facilitate introduction of outside air; the specific size of the intake silencer duct 18 is not strictly limited, and the inside diameter of the intake silencer duct 18 may be matched with the outside diameter of the blades of the low-speed micro fan 11, for example.
Further, as shown in fig. 4, a distributed air supply channel 19 may be further disposed on the cover body, the distributed air supply channel 19 may be pre-buried and distributed at a suitable position inside the cover body, an air inlet of the distributed air supply channel 19 may be communicated with an air outlet of the low-speed micro fan 11, an air outlet of the distributed air supply channel 19 may be communicated with the cavity through a hole 9 disposed at an inner side of the cover body, and the distributed air supply channel 19 may be matched with an outer diameter of a blade of the low-speed micro fan 11. The materials of the air intake silencing pipe 18 and the distributed air supply channel 19 are not strictly limited, and for example, food-grade high-temperature resistant lightweight materials such as PE and PP plastics can be adopted.
External air can be sent into the surfaces of different positions of the cover body through the breathable facing layer 14 through the air inlet silencing pipeline 18 and the distributed air supply channels 19, and then flows into the sound insulation cover through the pores 9 arranged on the breathable facing layer 14, so that the supply of the external cold and warm suitable air to a relatively closed space in the sound insulation cover is enhanced, the local direct blowing to the head of a human body is avoided, and the supply of fresh air is ensured.
The utility model discloses in, inhale sound insulation piece 3, top to upper portion and inhale sound insulation piece 2 and outside flip inhales articulated and nested mode between the sound insulation piece 1 and do not do strict limitation, as long as can realize the top and inhale sound insulation piece 2 shrink to inhale sound insulation piece 3 local overlap with upper portion, outside flip inhales sound insulation piece 1 upset and shrink to inhale the relevant function that sound insulation piece 2 local overlaps with the top can.
As shown in fig. 8, in an embodiment, the hinge structure may include a limiting pin 5 and a limiting sheet 6, the limiting pin 5 is inserted between the upper sound absorbing and insulating member 3, the top sound absorbing and insulating member 2, and the outer flip sound absorbing and insulating member 1, and the limiting sheet 6 is fixed at two ends of the limiting pin 5. In addition, as shown in fig. 9, the upper sound absorbing and insulating member 3, the top sound absorbing and insulating member 2, and the outer flip sound absorbing and insulating member 1 can be nested and hooked to each other for limitation by a limiting shoulder 8 and a limiting hanging shoulder 7 which can rotate an angle.
Under the above-mentioned mode of setting, sound insulating piece 3 is inhaled on upper portion, sound insulating piece 2 is inhaled at the top and sound insulating piece 1 is inhaled to outside flip through spacing shoulder 8 and spacing string shoulder 7 that can rotation angle nest each other, the hookup is spacing, the three along 5 central rotations of spacer pin, dislocation each other and local overlap to can make the degree of opening and close of the cover body become adjustable, it is more convenient to use.
Further, as shown in fig. 3 and 4, the cover body may further be provided with other auxiliary structural members such as an LED reading lamp 10, a charging device 13 with a USB interface, and the like, so as to provide auxiliary functions such as illumination and charging for people in prone reading.
In addition, as shown in fig. 6, a flip handle 12 may be provided below the outside flip sound absorbing and insulating member 1, thereby facilitating the flip of the outside flip sound absorbing and insulating member 1.
The portable adjustable head sound absorption and insulation cover of the utility model is suitable for sleeping on a couch, has suitable structure and size, keeps local openings on the reverse side of the body due to unstable thinking when the user just begins to fall asleep, and has the characteristics of portability, convenient movement, good sealing performance and air permeability, suitability for modular manufacture and assembly and the like; meanwhile, the upper sound absorption and insulation piece 3, the top sound absorption and insulation piece 2 and the outer flip sound absorption and insulation piece 1 are arranged in a mutually hinged and nested mode, so that the opening and closing degree of the cover body is adjustable, and the cover is more convenient to use. Through field measurement, the sound absorption and insulation effect of the head sound absorption and insulation cover is remarkable, the acoustic environment under the prone sleeping condition can be greatly improved, the interference of surrounding environment noise is eliminated, the sleeping is promoted, and the efficiency of entering deep sleeping from superficial sleeping is improved.
The utility model discloses a portable adjustable head sound absorption and insulation cover is used for under certain bedroom condition, the noise test of 50mm measurement stations in the auricle outside about the sleeping personnel head region of sleeping in the prone position state, and the noise test result of 50mm measurement stations in the auricle outside about the sleeping personnel head region of sleeping in the prone position state under the condition of having or not sound absorption and insulation cover sees table 1.
TABLE 1 test results of 50mm measuring point noise outside the left and right auricles and noise reduction amount of sound absorption and insulation cover
FIG. 10 shows a noise spectrum pair at 0.1m measurement points outside the left and right auricles with or without the portable adjustable head sound-absorbing and insulating cover; the noise reduction effect at the 0.1m measuring point outside the left and right auricles under the condition of the existence of the portable adjustable head sound absorption and insulation cover is shown in fig. 11.
Through the comparison of the test results in the above table 1 and fig. 10 and fig. 11, it can be found that the sound absorption and insulation cover of the present invention has good sound absorption, insulation and noise reduction effects, and the noise reduction amount thereof reaches 5.5-6.5 dBA.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. The utility model provides a sound proof cover is inhaled to head with adjustable it is portable, a serial communication port, include and inhale the sound insulation piece by the lower part, sound insulation piece is inhaled on upper portion, sound insulation piece is inhaled at the top and the outside flip inhales the sound insulation piece and encloses the cover body of establishing formation, the cover body has the appearance chamber that is suitable for human head, be equipped with the local opening of being convenient for human breathing and activity in the outside below of the cover body, sound insulation piece is inhaled on upper portion, sound insulation piece and outside flip are inhaled and articulate each other and nested setting between the sound insulation piece, sound insulation piece top is inhaled to upper portion and is fixed and inhale sound insulation piece top, sound insulation piece can shrink to inhale sound insulation piece local overlapping with upper portion in the top, sound insulation piece is inhaled to outside flip can overturn and shrink to inhale sound insulation piece local overlapping with the top, inhale sound insulation piece in the lower part, sound insulation piece.
2. The portable adjustable head sound absorption and insulation cover according to claim 1, wherein the lower sound absorption and insulation member, the upper sound absorption and insulation member, the top sound absorption and insulation member and the outer flip sound absorption and insulation member are respectively provided with a cambered surface shell, and the sound absorption and insulation layer is arranged on the inner side of the cambered surface shell.
3. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 1, wherein a breathable facing layer is arranged on the outer side of the sound-absorbing and sound-insulating layer, and a damping layer is arranged on the inner side of the sound-absorbing and sound-insulating layer.
4. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 1, wherein a low-speed micro fan is provided inside the cover body.
5. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 4, wherein the cover body is provided with an air inlet sound-insulating pipeline, an air inlet of the air inlet sound-insulating pipeline is communicated with the outside, and an air outlet of the air inlet sound-insulating pipeline is communicated with the low-speed micro fan.
6. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 4, wherein the cover body is provided with a distributed air supply channel, the distributed air supply channel is pre-embedded and distributed in the cover body, an air inlet of the distributed air supply channel is communicated with an air outlet of the low-speed micro fan, and an air outlet of the distributed air supply channel is communicated with the accommodating cavity through a hole arranged on the inner side of the cover body.
7. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 1, further comprising a limiting pin and a limiting sheet, wherein the limiting pin is arranged between the upper sound-absorbing and sound-insulating member, the top sound-absorbing and sound-insulating member and the outer flip sound-absorbing member in a penetrating manner, and the limiting sheet is fixed at two ends of the limiting pin.
8. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 1, wherein the upper sound-absorbing and sound-insulating member, the top sound-absorbing and sound-insulating member and the outer flip sound-absorbing and sound-insulating member are nested and hooked to each other for limitation through a limiting shoulder and a limiting hanging shoulder.
9. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 1, wherein an LED reading lamp and/or a charging device with a USB interface are/is provided on the cover body.
10. The portable adjustable head sound-absorbing and sound-insulating cover according to claim 1, wherein a flip handle is provided below the outer flip sound-absorbing and sound-insulating member.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022170284.2U CN213025380U (en) | 2020-09-28 | 2020-09-28 | Portable adjustable head sound absorption and insulation cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022170284.2U CN213025380U (en) | 2020-09-28 | 2020-09-28 | Portable adjustable head sound absorption and insulation cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213025380U true CN213025380U (en) | 2021-04-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022170284.2U Active CN213025380U (en) | 2020-09-28 | 2020-09-28 | Portable adjustable head sound absorption and insulation cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213025380U (en) |
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2020
- 2020-09-28 CN CN202022170284.2U patent/CN213025380U/en active Active
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