CN111885326A - Shell structure for tuner - Google Patents
Shell structure for tuner Download PDFInfo
- Publication number
- CN111885326A CN111885326A CN202010669309.5A CN202010669309A CN111885326A CN 111885326 A CN111885326 A CN 111885326A CN 202010669309 A CN202010669309 A CN 202010669309A CN 111885326 A CN111885326 A CN 111885326A
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- Prior art keywords
- waterproof
- cover
- casing
- ring
- tuner
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007789 sealing Methods 0.000 claims description 7
- 230000003746 surface roughness Effects 0.000 claims description 3
- 230000013011 mating Effects 0.000 claims description 2
- 239000003292 glue Substances 0.000 abstract description 16
- 238000003466 welding Methods 0.000 abstract description 9
- 238000005452 bending Methods 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 6
- 230000004927 fusion Effects 0.000 description 5
- 230000006872 improvement Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 238000010009 beating Methods 0.000 description 2
- 230000002950 deficient Effects 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000004026 adhesive bonding Methods 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/50—Tuning indicators; Automatic tuning control
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/063—Hermetically-sealed casings sealed by a labyrinth structure provided at the joining parts
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Physics & Mathematics (AREA)
- Astronomy & Astrophysics (AREA)
- General Physics & Mathematics (AREA)
- Details Of Aerials (AREA)
- Casings For Electric Apparatus (AREA)
Abstract
The invention discloses a shell structure for a tuner, which comprises a waterproof shell and a waterproof cover, wherein the waterproof shell comprises a hollow cylinder and a hollow horn body extending from one end of the hollow cylinder in the forward direction, the waterproof cover comprises a cover body and a cover side body extending from the periphery of the cover body in a bending mode, the hollow horn body and the cover side body are fastened and fixed, and are in interference fit, sealed and fixed, so that the waterproof cover and the waterproof shell are fixed and sealed and separately assembled, glue fixing or ultrasonic welding fixing is not needed, the structure and the assembly are simple, the assembly is firm, and the waterproofness is good.
Description
Technical Field
The invention relates to the technical field of high-frequency tuners, in particular to a shell structure for a high-frequency tuner.
Background
The low noise down converter of satellite TV is also called high frequency head (LNBF), which is composed of band-pass filter, high frequency amplifier, mixer, local oscillator and intermediate frequency amplifier. The tuner is used for amplifying weak signals received by the antenna, respectively carrying out down-conversion on signals with a frequency band of 3.4-4.2 GHz and a Ku frequency band of 10.75-12.75 GHz to a frequency band of 950-1450 MHz and a frequency band of 950-2150 MHz, then carrying out amplification output, transmitting the signals to a satellite audio-visual signal receiver through a coaxial cable, demodulating satellite signals transmitted by the tuner through the satellite audio-visual signal receiver, and demodulating satellite image signals and accompanying sound signals.
The tuner is often attacked by heavy rain and heavy rain outdoors and often encounters heavy snow and heavy fog weather, so that the high waterproof capability is required, and the waterproof grade is required to be over IP-67 so as to ensure that the product is intact and has normal function. Conventional tuner casing includes shell main part and lid among the prior art, glues waterproof fixed or ultrasonic bonding's mode waterproof fixation through beating between shell main part and the lid, wherein beats and glues waterproof fixed can increase the glue cost, beats and need carry out glue after gluing and solidify for a certain time, and manual beat to glue the speed slow, production efficiency is low, and during outdoor use tuner, glue exists ageing phenomenon easily, loses water-proof effects. In addition, the glue for the tuner is made of special materials, is unconventional high-viscosity glue and is mainly used for waterproof performance and low viscosity, so after the glue is cured, the cohesiveness is not firm, the cover body falls off or the cured glue breaks away from the cover body and the shell main body to cause cracks, and the waterproof effect is lost.
And ultrasonic welding theoretically can be firmer than a glue mode. But because send the ultrasonic wave and fuse main part and lid contact part, ultrasonic power, time, butt fusion position etc. all can influence the butt fusion effect, when big product uses ultrasonic fusion in batches, have defective products hidden danger easily (if the partial local butt fusion is incomplete and appears cavity or crack), need frequently debug, ultrasonic fusion output efficiency ratio is lower moreover, and ultrasonic welding also can produce the noise. In addition, ultrasonic welding cannot detect if a defective product is produced because ultrasonic welding is to penetrate through a product assembled outside and to weld and fix the surface between two products, and therefore whether the surface between the two products is welded completely or not cannot be detected by visual inspection, and the stability of waterproof performance depends on the stability of operation with a machine jig and a person.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a shell structure for a tuner, wherein a waterproof shell and a waterproof cover of the shell structure are fastened, fixed and sealed and fixed with a cover side body through a hollow horn body, so that the waterproof cover and the waterproof shell are fixed and sealed and separately assembled, and the shell structure is firm and stable in assembly, simple in structure and good in waterproofness.
The technical effect to be achieved by the invention is realized by the following scheme: the utility model provides a shell structure for tuner, includes waterproof casing and waterproof cover, the waterproof casing includes hollow cylinder and the hollow horn body that extends by the one end cisoid of hollow cylinder, the waterproof cover is including the lid body and the lid side body that extends of buckling by the periphery of lid body, hollow horn body with lid side body lock joint is fixed and the fixed and sealed separate assembly that realizes waterproof cover and waterproof casing of interference fit seal.
Preferably, the cover side body comprises a first side split body and a second side split body which extend downwards in the same direction, a first U-shaped groove is formed between the first side split body and the second side split body, a first protruding ring extends outwards in the lateral direction of the outer side of the first side split body, and a second protruding ring extends outwards in the lateral direction of the outer side of the second side split body.
Preferably, the hollow horn body includes the first post side body and the second post side body that the syntropy upwards extends, form the second U-shaped groove between the first post side body and the second post side body, an annular channel has been seted up to the inboard of first post side body, during the assembly first side components of a whole that can function independently extend to the second U-shaped inslot just first protruding ring is fixed with the annular channel lock joint, the second post side body extends to first U-shaped inslot just the inboard interference fit sealing fixed connection of second protruding ring and second post side body.
Preferably, the waterproof shell is made of PP or PE, and the waterproof cover is made of PP or PE.
Preferably, the interference amount of the first raised ring and the annular groove is 0.2mm-0.6mm on one side.
Preferably, the interference amount between the second bulge loop and the second column side body is 0.1mm-0.7mm of a single side, and the surface roughness of the matching surface of the second column side body and the second bulge loop is smooth and free of shrinkage pits.
Preferably, the thickness of the second column side body ranges from 0.5mm to 2.0 mm.
Preferably, the first protrusion ring has a trapezoidal cross-sectional shape, and the second protrusion ring has an arc cross-sectional shape.
Preferably, the end of the second side division body is also provided with a guide slope.
The invention has the following advantages:
1. the waterproof cover and the waterproof shell are hermetically assembled by buckling, matching and fixing the hollow horn body and the cover side body and sealing and fixing the hollow horn body and the cover side body in an interference fit manner, glue fixing or ultrasonic welding fixing is not needed, the structure and assembly are simple, the assembly is firm, and the waterproof performance is good;
2. the waterproof shell and the waterproof cover are separately extended into the second U-shaped groove by adopting the first side, the first protruding ring is fixedly clamped with the annular groove, and the waterproof shell and the waterproof cover are firmly fixed by adopting the whole-circle buckling position connection; extend to first U-shaped inslot just through the second post side body again the sealed fixed connection of inboard interference fit of the protruding ring of second and the second post side body realizes the sealed effect between waterproof casing and the waterproof cover, makes fixed knot between waterproof casing and the waterproof cover construct separately with waterproof, can not influence waterproof function because of the fixed slight error of waterproof casing and waterproof cover joint, waterproof nature is good when the assembly is firm.
Drawings
FIG. 1 is a three-dimensional exploded view of a tuner housing according to the present invention;
FIG. 2 is a schematic cross-sectional view of the housing structure for a tuner of the present invention after assembly;
FIG. 3 is a schematic half-sectional perspective view of the assembled housing structure for a tuner of the present invention;
fig. 4 is a schematic cross-sectional view of a waterproof cover in a housing structure for a tuner according to the present invention;
fig. 5 is a schematic half-sectional perspective view of a waterproof cover in a housing structure for a tuner according to the present invention;
fig. 6 is a schematic cross-sectional view of a waterproof casing in the casing structure for a high-frequency tuner of the present invention;
fig. 7 is a schematic half-sectional perspective view of a waterproof casing in the casing structure for a high-frequency tuner according to the present invention.
Detailed Description
The invention is described in detail below with reference to the drawings, wherein examples of the embodiments are shown in the drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second", "third" 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, a feature defined as "first," "second," or "third" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "disposed," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or may be connected through the interconnection of two elements or through the interaction of two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
With reference to fig. 1 to 7, an embodiment of the present invention provides a housing structure for a tuner, including a waterproof housing 100 and a waterproof cover 200, where the waterproof housing 100 includes a hollow cylinder 110 and a hollow horn 120 extending from one end of the hollow cylinder 110 in a forward direction, the waterproof cover 200 includes a cover body 210 and a cover side body 220 extending from an outer periphery of the cover body 210 in a bending manner, and the hollow horn 120 and the cover side body 220 are fastened and fixed, and are in interference fit, sealed and fixed to achieve separate assembly of the waterproof cover 200 and the waterproof housing 100, so that one fixing step can be achieved to simultaneously complete assembly fixing and waterproof sealing, without glue fixing or ultrasonic welding fixing, and the structure and the assembly are simple, and the assembly is firm and has good waterproof performance. The glue beating mode and the ultrasonic welding mode in the prior art are all assembled through a plurality of steps, and the rising of cost can be caused to glue cost, curing time cost, ultrasonic debugging cost, ultrasonic equipment cost etc. moreover, only need butt joint assembly can be accomplished after waterproof casing 100 and the waterproof cover 200 shaping of this application, do not have other cost expenditures, also provide the possibility for follow-up realization automatic assembly.
Specifically, as shown in fig. 1 to 3, the planar shape of the cover body 210 is a circular shape, the cross section of the hollow cylinder 110 is a circular ring shape, the waterproof cover 200 is formed above the waterproof housing 100 in an up-down assembly structure, and the cover side 220 extends downward so as to be vertically aligned and matched with the hollow horn 120 extending upward. As shown in fig. 4, the cover side body 220 includes a first side division body 221 and a second side division body 222 extending downward in the same direction, a first U-shaped groove 223 is formed between the first side division body 221 and the second side division body 222, a first protruding ring 224 extends laterally outward from the outer side of the first side division body 221, and a second protruding ring 225 extends laterally outward from the outer side of the second side division body 222. As shown in fig. 6, the hollow horn 120 includes a first pillar side 121 and a second pillar side 122 extending upward in the same direction, a second U-shaped groove 123 is formed between the first pillar side 121 and the second pillar side 122, an annular groove 124 is formed on the inner side of the first pillar side 121, the first side sub-body 221 extends into the second U-shaped groove 123 and the first protrusion ring 224 is fastened and fixed with the annular groove 124 during assembly, and the second pillar side 122 extends into the first U-shaped groove 223 and the second protrusion ring 225 is in interference fit with the inner side of the second pillar side 122 for sealing and fixing.
In the embodiment of the invention, the waterproof shell 100 and the waterproof cover 200 extend into the second U-shaped groove 123 by adopting the first side split body 221, the first raised ring 224 is fastened and fixed with the annular groove 124, and the waterproof shell 100 and the waterproof cover 200 are firmly fixed by adopting the whole-circle fastening position connection; extend to in first U-shaped groove 223 through second lateral body 122 again just the inboard interference fit fixed connection of second protruding ring 225 and second lateral body 122 realizes the sealed effect between waterproof casing 100 and waterproof cover 200, make fixed knot between waterproof casing 100 and the waterproof cover 200 construct with waterproof structure separately, adopt the mode that synchronous assembly operation is nevertheless fixed and sealed separately to set up, can not influence waterproof function because of the tiny error that waterproof casing 100 and waterproof cover 200 lock joint are fixed, can not influence waterproof function because of ultrasonic welding is incomplete between waterproof casing 100 and the waterproof cover 200 yet, waterproof nature is good when the assembly is firm.
As a further improvement of the present invention, the waterproof housing 100 is made of PP or PE, and is ejected from the mold by a strong demolding manner, and the interference between the first protruding ring 224 and the annular groove 124 is 0.2mm to 0.6mm on one side, which is good in sealing performance and easy to assemble.
As a further improvement of the present invention, the waterproof cover 200 is made of PP or PE, which has a certain bending resistance, so that the second protruding ring 225 disposed on the second side body 222 and the second side body 122 can achieve an effective waterproof purpose when they are in interference fit. The interference amount between the second protrusion ring 225 and the second sidewall body 122 is 0.1mm-0.7mm on a single side, and the surface roughness of the matching surface of the second sidewall body 122 and the second protrusion ring 225 is smooth without shrinkage pit, i.e. the surface is smooth without shrinkage pit.
In the embodiment of the present invention, the cross-sectional shape of the first protrusion ring 224 is a trapezoid shape, but not limited thereto, and the trapezoid shape is more favorable for the firm fastening of the waterproof housing 100 and the waterproof cover 200. The cross-sectional shape of the second protrusion ring 225 is an arc shape, but not limited thereto, and within a certain angle, one surface of the arc surface can be attached to the mating surface, so that the second protrusion ring 225 and the second pillar side body 122 are in interference fit and more closely attached, and the size of the arc surface is easier to measure and control.
As a further improvement of the present invention, as shown in fig. 4, the end of the second side body 222 further has a guiding inclined surface 226, which plays a guiding function, so that the second protrusion ring 225 can smoothly slide into interference fit connection with the inner side wall of the second side body 122. The first side division body 221 is gradually narrowed toward the second U-shaped groove 123, so that the first side division body 221 can smoothly slide into the second U-shaped groove 123.
In the embodiment of the present invention, the cap body 210 and the cap side body 220 are integrally formed by injection molding, and the hollow cylinder 110 and the hollow horn 120 are integrally formed by injection molding. As a further improvement of the present invention, since the second pillar body 122 and the second protrusion ring 225 cannot have a sink phenomenon, the thickness of the second pillar body 122 is preferably in the range of 0.5mm to 2.0mm, the sink phenomenon is not easily generated, and a sink phenomenon may occur after the thickness is greater than 2.0mm, which may affect the waterproof performance.
The assembly mode of this application waterproof casing 100 and waterproof cover 200, through mould and the control of the size of moulding plastics, utilize wider interference size scope can both reach waterproof function, and sealing performance is very stable.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention and not for limiting the same, and although the embodiments of the present invention are described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the embodiments of the present invention, and these modifications or equivalent substitutions cannot make the modified technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. The utility model provides a shell structure for tuner, includes waterproof casing and waterproof cover, the waterproof casing includes hollow cylinder and the hollow horn body that extends by the one end cisoid of hollow cylinder, the waterproof cover is including the lid body and the lid side body that extends by the periphery of lid body is buckled, its characterized in that, the hollow horn body with lid side body lock joint is fixed and the sealed fixed waterproof cover and waterproof casing's of realization is assembled separately with sealed.
2. The casing structure for a high-frequency tuner as claimed in claim 1, wherein the cover side body comprises a first side division body and a second side division body which extend downwards in the same direction, a first U-shaped groove is formed between the first side division body and the second side division body, a first convex ring extends outwards in the transverse direction on the outer side of the first side division body, and a second convex ring extends outwards in the transverse direction on the outer side of the second side division body.
3. The casing structure for a high-frequency tuner as claimed in claim 2, wherein the hollow horn includes a first pillar side body and a second pillar side body extending upward in the same direction, a second U-shaped groove is formed between the first pillar side body and the second pillar side body, an annular groove is formed on the inner side of the first pillar side body, the first side split body extends into the second U-shaped groove and the first protrusion ring is fastened and fixed with the annular groove during assembly, and the second pillar side body extends into the first U-shaped groove and the second protrusion ring is in interference fit with the inner side of the second pillar side body for sealing and fixing.
4. A casing structure for a high-frequency tuner as claimed in any one of claims 1 to 3, wherein the waterproof casing is made of PP or PE, and the waterproof cover is made of PP or PE.
5. A casing structure for a high-frequency tuner as claimed in claim 3, wherein the interference amount of the first projecting ring with the annular groove is 0.2mm to 0.6mm on a single side.
6. The housing structure for a high-frequency tuner as claimed in claim 3, wherein the interference between the second projecting ring and the second cylindrical side body is 0.1mm to 0.7mm on a single side, and the surface roughness of the mating surface of the second cylindrical side body and the second projecting ring is smooth and free from sink marks.
7. A casing structure for a high-frequency tuner as claimed in claim 6, wherein the thickness of said second column-side body is in the range of 0.5mm to 2.0 mm.
8. A casing structure for a high-frequency tuner as claimed in claim 3, wherein the first raised ring has a trapezoidal cross-sectional shape and the second raised ring has a circular arc cross-sectional shape.
9. A casing structure for a high-frequency tuner as claimed in claim 3, wherein the end of the second side division body further has a pilot slope.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010669309.5A CN111885326B (en) | 2020-07-13 | 2020-07-13 | A kind of high frequency Shell structure of head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010669309.5A CN111885326B (en) | 2020-07-13 | 2020-07-13 | A kind of high frequency Shell structure of head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111885326A true CN111885326A (en) | 2020-11-03 |
| CN111885326B CN111885326B (en) | 2024-08-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010669309.5A Active CN111885326B (en) | 2020-07-13 | 2020-07-13 | A kind of high frequency Shell structure of head |
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| Country | Link |
|---|---|
| CN (1) | CN111885326B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116092270A (en) * | 2022-12-19 | 2023-05-09 | 英思科传感仪器(上海)有限公司 | Single gas detection alarm |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203879647U (en) * | 2014-04-23 | 2014-10-15 | 浙江吉利控股集团有限公司 | Anti-disengagement cylinder head cover sealing gasket |
| CN207604076U (en) * | 2017-12-25 | 2018-07-10 | 考克（福建）工业设计有限公司 | A kind of dual waterproof box body |
| US20190348797A1 (en) * | 2018-05-09 | 2019-11-14 | J.S.T. Mfg. Co., Ltd. | Waterproof connector and waterproof structure of device case |
| CN212231608U (en) * | 2020-07-13 | 2020-12-25 | 深圳市平方兆赫科技有限公司 | Shell structure for tuner |
-
2020
- 2020-07-13 CN CN202010669309.5A patent/CN111885326B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203879647U (en) * | 2014-04-23 | 2014-10-15 | 浙江吉利控股集团有限公司 | Anti-disengagement cylinder head cover sealing gasket |
| CN207604076U (en) * | 2017-12-25 | 2018-07-10 | 考克（福建）工业设计有限公司 | A kind of dual waterproof box body |
| US20190348797A1 (en) * | 2018-05-09 | 2019-11-14 | J.S.T. Mfg. Co., Ltd. | Waterproof connector and waterproof structure of device case |
| CN212231608U (en) * | 2020-07-13 | 2020-12-25 | 深圳市平方兆赫科技有限公司 | Shell structure for tuner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116092270A (en) * | 2022-12-19 | 2023-05-09 | 英思科传感仪器(上海)有限公司 | Single gas detection alarm |
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| Publication number | Publication date |
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| CN111885326B (en) | 2024-08-20 |
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