[go: up one dir, main page]

CN110671025A - Steel ventilation sound insulation anti-theft door and sound insulation method - Google Patents

Steel ventilation sound insulation anti-theft door and sound insulation method Download PDF

Info

Publication number
CN110671025A
CN110671025A CN201910978397.4A CN201910978397A CN110671025A CN 110671025 A CN110671025 A CN 110671025A CN 201910978397 A CN201910978397 A CN 201910978397A CN 110671025 A CN110671025 A CN 110671025A
Authority
CN
China
Prior art keywords
sound insulation
steel plate
door
layer
theft door
Prior art date
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.)
Pending
Application number
CN201910978397.4A
Other languages
Chinese (zh)
Inventor
王林昌
贾猛虎
王赐轩
白启军
李飞
白培飞
刘桂峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CN201910978397.4A priority Critical patent/CN110671025A/en
Publication of CN110671025A publication Critical patent/CN110671025A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/10Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes
    • E06B5/11Doors, windows, or like closures for special purposes; Border constructions therefor for protection against air-raid or other war-like action; for other protective purposes against burglary
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/04Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00Layered products comprising a layer of metal
    • B32B15/18Layered products comprising a layer of metal comprising iron or steel
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B3/00Window sashes, door leaves, or like elements for closing wall or like openings; Layout of fixed or moving closures, e.g. windows in wall or like openings; Features of rigidly-mounted outer frames relating to the mounting of wing frames
    • E06B3/70Door leaves
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00Doors, windows, or like closures for special purposes; Border constructions therefor
    • E06B5/20Doors, windows, or like closures for special purposes; Border constructions therefor for insulation against noise
    • EFIXED CONSTRUCTIONS
    • E06DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06BFIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B7/00Special arrangements or measures in connection with doors or windows
    • E06B7/02Special arrangements or measures in connection with doors or windows for providing ventilation, e.g. through double windows; Arrangement of ventilation roses
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/10Properties of the layers or laminate having particular acoustical properties
    • B32B2307/102Insulating

Landscapes

  • Engineering & Computer Science (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Specific Sealing Or Ventilating Devices For Doors And Windows (AREA)

Abstract

A steel ventilation sound insulation anti-theft door and a sound insulation method. The anti-theft door comprises an entrance door opening, wherein the entrance door opening is provided with the anti-theft door, the anti-theft door is provided with an inner steel plate layer and an outer steel plate layer, the outer steel plate layer and the inner steel plate layer are clamped by an anti-theft door steel frame, the thickness of the outer steel plate layer is 3mm, the thickness of the inner steel plate layer is 3mm, the inner composite inner damping layer of the inner steel plate layer is compounded with a layer of steel plate, the outer composite damping layer of the layer of steel plate is compounded with a layer of steel plate, and a cavity body is arranged between the inner steel plate layer and the outer steel plate layer. The invention is used for the sound insulation anti-theft door.

Description

Steel ventilation sound insulation anti-theft door and sound insulation method
Technical Field
The invention relates to a steel ventilation sound-insulation anti-theft door and a sound insulation method.
Background
Most of existing houses are north-south transparent and are transparent, so that although ventilation effect is good in the rooms, the security door is usually closed for safety, indoor ventilation is achieved, the security door needs to be kept open, the security door can be opened through ventilation, potential safety hazards are caused to indoor people and property at the moment, and personal privacy can be influenced. In order to achieve multiple functions of room burglary prevention, ventilation, air exchange, indoor private environment and the like, researchers and researchers develop a ventilation and sound insulation burglary-resisting door which has a plurality of practical necessary meanings. The ventilation function can be opened to the owner at indoor burglary-resisting door that lives, but the theftproof function of theftproof soundproof door is not influenced, has realized indoor outer ventilation, but the personnel activity brows in corridor and the stairwell and can not cause the influence indoor, and indoor family talks or other privacy can not let outdoor corridor and stairwell listen to equally yet, has protected indoor privacy. Although the anti-theft, ventilation and sound insulation are contradictory, the contradictory oppositions are achieved through the acoustic technology, and the unified result is achieved. The entrance door has multiple functions of sound insulation, ventilation, theft prevention and the like.
Disclosure of Invention
The invention aims to provide a sound insulation and anti-theft door which is reasonable in structure and has sound insulation and anti-theft functions in a ventilation state
The above purpose is realized by the following technical scheme:
the steel ventilation and sound insulation anti-theft door comprises an entrance door opening, wherein the entrance door opening is provided with an anti-theft door body, the anti-theft door body is provided with an inner steel plate layer and an outer steel plate layer, a steel frame of the anti-theft door body is clamped between the outer steel plate layer and the inner steel plate layer, the thickness of the outer steel plate layer is 3mm, the thickness of the inner steel plate layer is 3mm, the inner composite inner damping layer of the inner steel plate layer is compounded with a layer of steel plate, the outer composite damping layer of the layer of steel plate is compounded, and a cavity body is arranged between the inner steel plate layer and the outer steel plate layer.
The steel ventilation and sound insulation anti-theft door is characterized in that the thickness of the inner damping layer is 3mm, the thickness of the outer damping layer is 3mm, and the thickness of the laminated steel plate is 1.5 mm.
A sound insulation method of a steel ventilation sound insulation anti-theft door is characterized in that a group of transversely arranged partitions are arranged in a steel frame of the anti-theft door, a cavity body is divided into 4 expansion cavities by the partitions, each partition is reserved with a vent, the cross sections of the vent and the expansion cavity are not smaller than 1/7, an air inlet is reserved at the bottom of a sound insulation structure on the outer side of the anti-theft door, the cross section of the air inlet is 50 x 700mm, the cross section of the air inlet is 1/10 of the expansion ratio of the cross section of a first expansion cavity, an indoor air outlet of the ventilation sound insulation door is located in the center of the upper portion 1/4 of the sound insulation structure on the inner side of the door, the size of the air outlet is 150 x 210mm, the ratio of the air outlet to a fourth expansion cavity reaches 1/4, outdoor air enters the.
Advantageous effects
1. The ventilation of the metal ventilation sound-proof door is realized by the indoor and outdoor temperature difference principle, and the indoor and outdoor temperature difference can form indoor and outdoor air pressure difference so as to ensure that the indoor air inlet window of the ventilation sound-proof door is opened to realize indoor and outdoor gas exchange.
The invention has the capabilities of ventilation, sound insulation and noise reduction, the cavity and the expansion cavity are realized by partition, the structure is reasonable, and the sound insulation effect is good.
The invention is a technology capable of insulating air sound outdoors in a ventilation state.
Drawings
Fig. 1 is a schematic structural diagram of the product.
FIG. 2 is a sectional view of the sound-proof anti-theft door.
Detailed Description
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.
Example 1
The steel ventilation and sound insulation anti-theft door comprises an entrance door opening 1, wherein the entrance door opening is provided with an anti-theft door body, the anti-theft door body is provided with an inner steel plate layer 2 and an outer steel plate layer 3, the outer steel plate layer and the inner steel plate layer are clamped by an anti-theft door steel frame 4, the thickness of the outer steel plate layer is 3mm, the thickness of the inner steel plate layer is 3mm, an inner composite inner damping layer 5 of the inner steel plate layer is arranged, an inner damping layer is compounded with a layer of steel plate 6, an outer steel plate compound damping layer 7 is compounded with a layer of steel plate, and a cavity body is arranged between the inner steel plate layer and the outer steel plate layer.
Example 2
The steel ventilation and sound insulation anti-theft door in embodiment 1 is characterized in that the thickness of the inner damping layer is 3mm, the thickness of the outer damping layer is 3mm, and the thickness of the laminated steel plate is 1.5 mm.
Example 3
A sound insulation method of a steel ventilation sound insulation anti-theft door is characterized in that a group of transversely arranged partitions 8 are arranged in a steel frame of the anti-theft door, the partitions divide a cavity into 4 expansion cavities 9, each partition is provided with a vent 10, the cross sections of the vent and the expansion cavity are not smaller than 1/7, an air inlet 11 is reserved at the bottom of a sound insulation structure on the outer side of the anti-theft door, the cross section of the air inlet is 50 x 700mm, the cross section of the air inlet and the expansion ratio of a first expansion cavity are 1/10, an indoor air outlet of the ventilation sound insulation door is arranged in the center of the upper portion 1/4 of the sound insulation structure on the inner side of the door, the size of the air outlet is 150 x 210mm, the ratio of the air outlet and a fourth expansion cavity reaches 1/4, outdoor air enters the interior of the door and undergoes.
Example 4
The steel ventilation and sound insulation anti-theft door comprises an entrance door opening, wherein an anti-theft door is installed at the entrance door opening, the anti-theft door is composed of an inner anti-theft structure and an outer anti-theft structure, the anti-theft structures are multi-layer steel plates which are respectively 3mm, 1.5mm and 3mm, and the steel plates are bonded through damping layers, so that the composite structure has a better anti-theft effect than the traditional anti-theft door; the hinge lock adopted by the anti-theft sound-insulation ventilating door is special for the anti-theft door, so that the anti-theft function of the anti-theft ventilating door is ensured, the lock can ensure the sealing of the sound-insulation door leaf and the door frame through experiments, and the anti-theft ventilating door has the basic function of a sound-insulation door.
Because the inside and outside veneer structure of burglary-resisting door that theftproof sound insulation air door adopted is the steel sheet of the different thickness of multilayer and between steel sheet and the steel sheet through the damping layer and the bonding together, make the inside and outside theftproof structure of its burglary-resisting door not only possess higher air sound insulation volume, possess the effect of fine impact sound attenuation simultaneously. The sound insulation structure is characterized in that the sound insulation structure and the sound insulation structure are disconnected through the damping layer through the multilayer sound insulation structure, so that steel plates with different thicknesses are free from the restriction of mass density on the sound insulation quantity of the structure, the air sound pressure level received by each layer of structure in an outer channel is gradually decreased layer by layer, the sound insulation structure is characterized in that the impact sound pressure level of the sound insulation structure is attenuated layer by layer from outside to inside under the constraint of the damping layer through the damping layer, the noise energy with different air sound and impact sound is effectively attenuated, and the better sound insulation effect of the anti-theft ventilation sound insulation door is achieved. The sound insulation structure is detected by researchers through a building environment detection center of Qinghua university, and the conclusion is that the air sound insulation quantity of a 152mm composite structure reaches 54dB and the impact sound insulation quantity reaches 18dB through detection (two layers of 12mm cement pressure plates, damping layers are additionally arranged between the plates and an original building structure, namely 120 mm). The 152mm composite structure has the air sound insulation amount exceeding 250mm, and the sound insulation member only has the air sound insulation amount and does not have the attenuation of the sound insulation amount of impact sound. The same structure obtains the sound insulation quantity and attenuation of different noises. Every layer and make the steel sheet that adopts different thickness and have interior steel sheet layer and outer steel sheet layer between the multilayer steel sheet, outer steel sheet layer with interior steel sheet layer between centre gripping burglary-resisting door steel frame, the thickness on outer steel sheet layer be 3mm, the thickness on interior steel sheet layer be 3mm, the inboard compound interior damping layer on interior steel sheet layer, the compound layer steel sheet that adds of interior damping layer, add the compound outer damping layer of layer steel sheet, interior steel sheet layer with outer steel sheet layer between have the cavity body.
Example 5
In the sound insulation method of the steel ventilation and sound insulation security door described in embodiment 3, a group of transversely arranged partitions is arranged in a steel frame of the security door, the partitions divide a cavity body into 4 expansion chambers, each partition is provided with a vent, the cross sections of the vent and the expansion chamber are not smaller than 1/7, an air inlet is reserved at the bottom of a sound insulation structure on the outer side of the security door, the cross section of the air inlet is 50 × 700mm, the cross section of the air inlet is 1/10 of the expansion ratio of the cross section of the first expansion chamber, an indoor air outlet of the ventilation and sound insulation door is located in the center of the upper part 1/4 of the sound insulation structure on the inner side of the door, the size of the air outlet is 150 × 210mm, the ratio of the air outlet to a fourth expansion chamber reaches 1/4, outdoor air enters the room and undergoes five times of gas expansion.
Example 6
In the embodiment of the steel ventilation and sound insulation anti-theft door, in order to enable the entrance door to have an anti-theft function, the door body is made of a 3mm steel plate, and the hinge lock adopts the professional hardware of the anti-theft door, so that the anti-theft function of the ventilation soundproof door is met, how the sound insulation door has the sound insulation function, the inner and outer sound insulation structure (simultaneously, the steel structure of the anti-theft door) of the metal door is a 3.0mm steel plate, in order to enhance the air sound insulation quantity and the attenuation of impact sound energy, two 3mm damping layers are compounded on the inner sides of the 3.0mm steel plates on the inner and outer surfaces of the door, and a 1.5mm steel plate is added between the two damping layers, so that the inner and outer structures of the soundproof door become a compound sound insulation structure, the composite sound insulation structure has the advantages that the air sound insulation detection and the impact sound attenuation detection are respectively carried out, the impact sound attenuation 18dB and the 120mm steel-concrete structure are adopted, and the air sound insulation amount of the two layers of 12mm cement pressure plates is increased to Rw54 dB. The ventilation function of the steel anti-theft sound insulation door is realized by forming an inner sound insulation structure cavity and an outer sound insulation structure cavity of the door, the inner cavity of the door is 90mm, the door height is 2000mm, the cavity of the door is divided into 4 expansion cavities through partitions, each partition is provided with a vent, the cross section area of each vent and the cross section area of each expansion cavity are not less than 1/7, an air inlet is reserved at the bottom of the sound insulation structure on the outer side of the sound insulation door, the cross section area of each air inlet is 50 x 700mm, so that the cross section area of each air inlet and the first expansion cavity generate an expansion ratio of 1/10, an indoor air outlet of the ventilation sound insulation door is designed at the central position of an upper part 1/4 of the sound insulation structure on the inner side of the door, and the size of the air outlet is. The air outside the room can be expanded for five times when entering the room, and the inner cavity of the sound insulation door is designed to be a reactive muffler. In order to prevent reverberation in the cavity of the metal structure from affecting the sound insulation effect of the ventilation sound insulation door, a sound absorption structure of 20mm is added in each expansion wall. In order to solve the problem of indoor heat preservation in winter, a window sash is additionally arranged at an indoor air inlet.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims (3)

1. The steel ventilation and sound insulation anti-theft door comprises an entrance door opening and is characterized in that the entrance door opening is provided with an anti-theft door, the anti-theft door is provided with an inner steel plate layer and an outer steel plate layer, an anti-theft door steel frame is clamped between the outer steel plate layer and the inner steel plate layer, the thickness of the outer steel plate layer is 3mm, the thickness of the inner steel plate layer is 3mm, an inner damping layer is compounded on the inner side of the inner steel plate layer, a steel plate is compounded on the inner damping layer, an outer damping layer is compounded on the steel plate, and a cavity is arranged between the inner steel plate layer and the outer steel plate layer.
2. The steel ventilation and sound insulation anti-theft door as claimed in claim 1, wherein the thickness of the inner damping layer is 3mm, the thickness of the outer damping layer is 3mm, and the thickness of the laminated steel plate is 1.5 mm.
3. A sound insulation method of a steel ventilation and sound insulation anti-theft door is characterized in that a group of transversely arranged partitions are arranged in a steel frame of the anti-theft door and divide a cavity body into 4 expansion cavities, each partition is provided with a ventilation opening, the cross sections of the ventilation opening and the expansion cavities are not smaller than 1/7, an air inlet is reserved at the bottom of a sound insulation structure on the outer side of the anti-theft door, the cross section of the air inlet is 50 x 700mm, the cross section of the air inlet is 1/10 of the expansion ratio of the first expansion cavity to the cross section of the air inlet, an indoor air outlet of the ventilation and sound insulation door is located in the center of the upper portion 1/4 of the sound insulation structure on the inner side of the door, the size of the air outlet is 150 x 210mm, the ratio of the air outlet to a fourth expansion cavity reaches 1/4, outdoor air.
CN201910978397.4A 2019-10-15 2019-10-15 Steel ventilation sound insulation anti-theft door and sound insulation method Pending CN110671025A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910978397.4A CN110671025A (en) 2019-10-15 2019-10-15 Steel ventilation sound insulation anti-theft door and sound insulation method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910978397.4A CN110671025A (en) 2019-10-15 2019-10-15 Steel ventilation sound insulation anti-theft door and sound insulation method

Publications (1)

Publication Number Publication Date
CN110671025A true CN110671025A (en) 2020-01-10

Family

ID=69082602

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910978397.4A Pending CN110671025A (en) 2019-10-15 2019-10-15 Steel ventilation sound insulation anti-theft door and sound insulation method

Country Status (1)

Country Link
CN (1) CN110671025A (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201460648U (en) * 2009-09-10 2010-05-12 重庆文理学院 Laboratory ventilation soundproof anti-peep anti-theft door
CN102296917A (en) * 2011-06-14 2011-12-28 何昌云 Daylighting, ventilating and soundproofing door and window
CN202862698U (en) * 2012-09-28 2013-04-10 常熟华冶薄板有限公司 Color coated steel plate with vibration reduction and noise reduction functions
CN103670223A (en) * 2012-09-20 2014-03-26 贵阳铝镁设计研究院有限公司 Production method and structure for steel sound-proof fireproof door
EP2809713B1 (en) * 2012-02-03 2016-01-27 Knauf Insulation Composite fibre panel
CN106761296A (en) * 2016-12-12 2017-05-31 南京大学 Ventilating sound-proof door
CN206221072U (en) * 2016-12-06 2017-06-06 广州市亚虎动力设备有限公司 A kind of diesel-driven generator noise reduction Sound absorption louver window
CN107097485A (en) * 2017-07-06 2017-08-29 安徽机电职业技术学院 Composite damping steel plate for automobile oil pan
CN206530632U (en) * 2017-03-16 2017-09-29 麻城市通达阻尼材料股份有限公司 A kind of composite damping steel plate

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201460648U (en) * 2009-09-10 2010-05-12 重庆文理学院 Laboratory ventilation soundproof anti-peep anti-theft door
CN102296917A (en) * 2011-06-14 2011-12-28 何昌云 Daylighting, ventilating and soundproofing door and window
EP2809713B1 (en) * 2012-02-03 2016-01-27 Knauf Insulation Composite fibre panel
CN103670223A (en) * 2012-09-20 2014-03-26 贵阳铝镁设计研究院有限公司 Production method and structure for steel sound-proof fireproof door
CN202862698U (en) * 2012-09-28 2013-04-10 常熟华冶薄板有限公司 Color coated steel plate with vibration reduction and noise reduction functions
CN206221072U (en) * 2016-12-06 2017-06-06 广州市亚虎动力设备有限公司 A kind of diesel-driven generator noise reduction Sound absorption louver window
CN106761296A (en) * 2016-12-12 2017-05-31 南京大学 Ventilating sound-proof door
CN206530632U (en) * 2017-03-16 2017-09-29 麻城市通达阻尼材料股份有限公司 A kind of composite damping steel plate
CN107097485A (en) * 2017-07-06 2017-08-29 安徽机电职业技术学院 Composite damping steel plate for automobile oil pan

Similar Documents

Publication Publication Date Title
CN210032167U (en) Low-frequency noise insulation board and sound insulation cover
US7562743B2 (en) Acoustical window and door covering
CN209742125U (en) Sound-proof fireproof heat-insulation external wall
CN103670223A (en) Production method and structure for steel sound-proof fireproof door
CN110671025A (en) Steel ventilation sound insulation anti-theft door and sound insulation method
CN206091811U (en) Sound proof window
JPH08144390A (en) Structure of translucent sound absorbing panel
CN215565536U (en) Natural draft soundproof window
CN103089125A (en) Wooden sound-insulation fireproof door
CN112177508B (en) Ventilation and noise reduction windows
CN201045271Y (en) Energy-saving soundproof windows
CN210530418U (en) Superstrong sound insulation ventilation faces building
CN112854991A (en) Double-layer aluminum alloy sound insulation door and window structure
CN223104468U (en) Single soundproof fire door
CN211115620U (en) Sound insulation suit door
CN215718305U (en) Multifunctional heat and sound insulation door
CN222478514U (en) A multi-layer wooden door
CN213807402U (en) Fireproof door leaf and suit door with fireproof door leaf
CN212898222U (en) Household soundproof door
CN222863257U (en) Steel-wood heat-insulation sound-insulation fireproof door
CN104775726A (en) Shell and tube type soundproof window
CN209976375U (en) Fireproof and sound-proof multi-material composite durable door
CN217131493U (en) Indoor fresh air return opening structure based on passive room
CN2727365Y (en) Ventilating sound-insulating window
CN208280855U (en) Fire resistant doorsets with sound absorption function

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200110

RJ01 Rejection of invention patent application after publication