CN218781409U - Clean fresh air machine with bidirectional flow, no heat recovery and low noise - Google Patents
Clean fresh air machine with bidirectional flow, no heat recovery and low noise Download PDFInfo
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- CN218781409U CN218781409U CN202223062097.8U CN202223062097U CN218781409U CN 218781409 U CN218781409 U CN 218781409U CN 202223062097 U CN202223062097 U CN 202223062097U CN 218781409 U CN218781409 U CN 218781409U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
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Abstract
The utility model discloses a clean fresh air machine with low noise and no heat recovery by bidirectional flow, which comprises a machine body, a fresh air fan, an exhaust fan, a fresh air primary filter and a fresh air high-efficiency filter; the machine body is provided with a fresh air inlet, an air exhaust inlet, a fresh air outlet and an air exhaust outlet; a first fresh air silencing chamber is arranged between the fresh air primary filter and the fresh air fan, and a second fresh air silencing chamber is arranged between the fresh air fan and the fresh air high-efficiency filter; an air exhaust silencing channel is arranged between the air exhaust fan and the air exhaust inlet. The clean fresh air fan is arranged between the primary filter and the wind efficient filter, and is combined with the first fresh air silencing chamber and the second fresh air silencing chamber to form multiple alternative arrangements of sound absorption and silencing so as to reduce the running noise; through the effect of amortization passageway of airing exhaust, reduce the running noise of the fan of airing exhaust, avoid its noise to spread from the entry of airing exhaust to make it have better noise reduction efficiency, can provide clean new trend for indoor simultaneously.
Description
Technical Field
The utility model relates to a clean new fan technical field, concretely relates to be applied to the two-way flow that needs clean ventilation, has higher requirement, nevertheless does not have the place of requirement to heat recovery to the noise and does not take clean new fan of heat recovery and low noise.
Background
In a comfortable home environment, the air quality represents the quality of life, the temperature, the humidity and the cleanliness of air concern the daily life of people, and the poor air environment seriously threatens the physical and mental health of people.
The fresh air machine is an effective air purification device, can circulate indoor air, on one hand, exhausts indoor dirty air outdoors, on the other hand, inputs outdoor fresh air into the room after measures such as sterilization, disinfection, filtration and the like, and ensures that the air in the room is fresh and clean air at every moment.
In the conventional technology, to the clean new fan that needs clean ventilation, has higher requirement to the noise, but does not have the requirement to heat recovery, the clean new fan of suspension type two-way flow that does not have heat recovery promptly, the new trend passes through 1 ~ 3 grades of filtration behind the air intake, its fan arrangement structure is new trend lug connection air outlet, indoor return air is after the return air entry, the individuality product also is equipped with 1 ~ 2 grades of filter screens, is taken out to the open air by the fan of airing exhaust, the fan of new trend and airing exhaust all does not have the amortization passageway. The conventional techniques described above have the following problems: the fresh air outlet is the fan outlet, the fan noise is not subjected to noise reduction treatment, and the distance between the exhaust fan and the indoor return air inlet is short, so that the running noise of the fresh air fan is large, the structure is not suitable for being used as a direct blowing or wall hanging machine, only suitable for pipeline air supply, and the installation mode is a ceiling type.
SUMMERY OF THE UTILITY MODEL
In order to overcome the not enough of prior art, the utility model provides a clean new fan of heat recovery and low noise is not taken to two-way flow solves above-mentioned traditional problem, and it can reduce the running noise of fan in it through reasonable design under the condition of no heat recovery heat exchanger, simultaneously for indoor clean new trend that provides.
The utility model discloses a following technical scheme realizes:
a clean fresh air fan with bidirectional flow, no heat recovery and low noise comprises a machine body, a fresh air fan, an exhaust fan, a fresh air primary filter and a fresh air high-efficiency filter, wherein the fresh air fan, the exhaust fan, the fresh air primary filter and the fresh air high-efficiency filter are arranged in the machine body; the fresh air inlet and the air exhaust inlet are arranged at the same end of the machine body, and the fresh air outlet and the air exhaust outlet are arranged at the other end of the machine body; the fresh air fan is arranged between the fresh air primary filter and the fresh air high-efficiency filter, a first fresh air silencing chamber is arranged between the fresh air primary filter and the fresh air fan, and a second fresh air silencing chamber is arranged between the fresh air fan and the fresh air high-efficiency filter; the exhaust fan is arranged at the exhaust outlet, and an exhaust silencing channel is arranged between the exhaust fan and the exhaust inlet.
Preferably, the area of the first fresh air muffling chamber is larger than that of the second fresh air muffling chamber.
Preferably, an installation plate is arranged between the first fresh air silencing room and the second fresh air silencing room, and the fresh air fan is installed on the installation plate.
Preferably, a third fresh air silencing chamber is arranged between the fresh air primary filter and the fresh air inlet, a fourth fresh air silencing chamber is arranged between the fresh air high-efficiency filter and the fresh air outlet, the first fresh air silencing chamber, the second fresh air silencing chamber, the third fresh air silencing chamber and the fourth fresh air silencing chamber form a fresh air silencing channel, and silencing cotton is attached to the inner wall of the fresh air silencing channel.
Preferably, the length of the exhaust silencing channel is greater than that of the fresh air silencing channel.
Preferably, the exhaust silencing passage is of an inverted-L-shaped structure on a longitudinal section.
Preferably, the inner wall of the exhaust silencing channel is adhered with silencing cotton.
Preferably, the exhaust silencing passage is provided with an exhaust primary filter near the exhaust inlet, and a silencing gap is formed between the exhaust primary filter and the exhaust inlet.
Preferably, the mounting structure of the machine body is one of a floor type structure, a wall-mounted structure and a ceiling type structure.
Preferably, when the mounting structure of the machine body is a floor type structure, the bottom of the machine body is provided with feet, the fresh air inlet is arranged on the back or the bottom of the machine body, the fresh air outlet is arranged on the side or the front of the machine body, the air exhaust inlet is arranged on the side of the machine body, and the air exhaust outlet is arranged on the back or the top of the machine body;
when the mounting structure of the machine body is a wall-mounted structure, the fresh air inlet is arranged on the back surface or the bottom surface of the machine body, the fresh air outlet is arranged on the side surface or the front surface of the machine body, the exhaust air inlet is arranged on the side surface or the bottom surface of the machine body, and the exhaust air outlet is arranged on the back surface or the top surface of the machine body;
when the mounting structure of the machine body is of a ceiling type structure, lifting lugs are arranged at corners of the top bottom surface of the machine body, the fresh air inlet is formed in the bottom surface of the machine body, the fresh air outlet is formed in the side surface of the machine body, the air exhaust inlet is formed in the side surface or the bottom surface of the machine body, and the air exhaust outlet is formed in the top surface of the machine body.
Compared with the prior art, the beneficial effects of the utility model reside in that:
the clean fresh air machine without heat recovery and low noise of the bidirectional flow of the utility model is characterized in that the fresh air machine is arranged between the fresh air primary filter and the fresh air high-efficiency filter, and is also provided with a first fresh air silencing chamber and a second fresh air silencing chamber, thus forming multiple alternative arrangement of sound absorption and silencing to reduce the running noise of the fresh air machine therein; the exhaust fan is arranged at the exhaust outlet, the operation noise of the exhaust fan is reduced under the action of the exhaust silencing channel, and the noise is prevented from being transmitted from the exhaust inlet, so that the new fan still has a good noise reduction effect under the condition of no heat recovery equipment, and clean fresh air can be provided indoors at the same time.
Drawings
FIG. 1 is a schematic front view of a low-noise clean fresh air machine without heat recovery with bi-directional flow according to a preferred embodiment of the present invention;
fig. 2 is a schematic diagram of the internal structure of the clean fresh air machine with bidirectional flow, without heat recovery and low noise shown in fig. 1.
In the figure: 10. a body; 11. a fresh air inlet; 12. an exhaust inlet; 13. a fresh air outlet; 14. an air exhaust outlet; 15. a door lock; 20. a fresh air fan; 21. mounting a plate; 30. an exhaust fan; 31. an exhaust silencing channel; 32. a primary air exhaust filter; 40. a fresh air primary filter; 50. a fresh air high-efficiency filter; 60. a first fresh air muffling chamber; 61. a second fresh air silencing chamber; 62. a third fresh air anechoic chamber; 63. and a fourth fresh air silencing chamber.
Detailed Description
In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, as those skilled in the art will be able to make similar modifications without departing from the spirit and scope of the present invention.
In the description of the present invention, it is to be understood that 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 implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description of the present invention, it will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. In contrast, when an element is referred to as being "directly connected" to another element, there are no intervening elements present.
Please refer to fig. 1 and 2, which are schematic views of a bi-directional flow clean fresh air machine without heat recovery and with low noise according to a preferred embodiment of the present invention, for providing clean fresh air indoors, which is suitable for places requiring clean ventilation, having higher requirements for noise, but having no requirements for heat recovery; specifically, the clean fresh air fan comprises a machine body 10, a fresh air fan 20, an exhaust fan 30, a fresh air primary filter 40 and a fresh air high-efficiency filter 50 which are arranged in the machine body 10; the fresh air inlet 11, the exhaust air inlet 12, the fresh air outlet 13 and the exhaust air outlet 14 are arranged on the machine body 10, the fresh air inlet 11 and the exhaust air inlet 12 are arranged at the same end of the machine body 10, and the fresh air outlet 13 and the exhaust air outlet 14 are arranged at the other end of the machine body 10; the fresh air fan 20 is arranged between the fresh air primary filter 40 and the fresh air high-efficiency filter 50, a first fresh air silencing chamber 60 is arranged between the fresh air primary filter 40 and the fresh air fan 20, and a second fresh air silencing chamber 61 is arranged between the fresh air fan 20 and the fresh air high-efficiency filter 50; the exhaust fan 30 is arranged at the exhaust outlet 14, and an exhaust silencing passage 31 is arranged between the exhaust fan 30 and the exhaust inlet 12. Wherein, the mounting structure of organism 10 is but not limited to one in console mode structure, wall-hanging structure, the suspension type structure, designs as required, and fresh air inlet 11, air exhaust inlet 12, fresh air outlet 13, air exhaust outlet 14 are laid according to the structure of organism 10.
The clean fresh air fan is provided with a first fresh air silencing chamber 60 and a second fresh air silencing chamber 61 by arranging the fresh air fan 20 between the fresh air primary filter 40 and the fresh air high-efficiency filter 50, so that multiple alternative arrangements of sound absorption and silencing are formed, and the running noise of the fresh air fan 20 in the clean fresh air fan is reduced; the exhaust fan 30 is arranged at the exhaust outlet 14, and the operation noise of the exhaust fan 30 is reduced through the effect of the exhaust silencing channel 31, so that the noise is prevented from being transmitted from the exhaust inlet 12, the new fan still has a good noise reduction effect under the condition of no heat recovery equipment, and clean fresh air can be provided for indoor.
In one embodiment, the area of the first fresh air muffling chamber 60 is larger than the area of the second fresh air muffling chamber 61, that is, the area of the first fresh air muffling chamber 60 where the fresh air fan 20 is located is larger, so that the running noise of the machine can be diffused through the muffling chamber, and then the noise decibels of the machine carried by the fresh air are lower when the machine noise flows to the fresh air outlet 13 through the further diffusion of the second fresh air muffling chamber 61, thereby effectively reducing the running noise of the machine. Optionally, the area of the first fresh air muffling chamber 60 is 1.2 to 1.6 times the area of the second fresh air muffling chamber 61. In other embodiments, an installation plate 21 is disposed between the first fresh air muffling chamber 60 and the second fresh air muffling chamber 61, and the fresh air fan 20 is installed on the installation plate 21, that is, the installation plate 21 is used for installing the fresh air fan 20, so that the first fresh air muffling chamber 60 and the second fresh air muffling chamber 61 are separated from each other, thereby blocking noise transmission between the fresh air inlet 11 and the fresh air outlet 13 and buffering the wind speed of the fresh air.
In this embodiment, a third fresh air silencing chamber 62 is arranged between the fresh air primary filter 40 and the fresh air inlet 11, a fourth fresh air silencing chamber 63 is arranged between the fresh air high-efficiency filter 50 and the fresh air outlet 13, the first fresh air silencing chamber 60, the second fresh air silencing chamber 61, the third fresh air silencing chamber 62 and the fourth fresh air silencing chamber 63 form a fresh air silencing channel, and silencing cotton is attached to the inner wall of the fresh air silencing channel. Optionally, the length of the exhaust silencing channel 31 is greater than that of the fresh air silencing channel, the exhaust silencing channel 31 is roughly in an inverted L-shaped structure on the longitudinal section, that is, the exhaust outlet 14 is arranged at the upper end of the fresh air outlet 13, so that the longer the exhaust silencing channel 31 can be, the better the silencing effect is, and meanwhile, the exhaust silencing channel 31 in the L-shaped structure makes the exhaust wind direction form a turning output, so as to buffer the noise caused by the wind speed. Optionally, silencing cotton is attached to the inner wall of the exhaust silencing channel 31 to further silence the inside of the machine body 10, wherein the inner walls of the fresh air fan 20 and the exhaust air fan 30 are both two layers of silencing cotton, so that noise is prevented from being transmitted mutually. The number of the fresh air fans 20 is 2, and the number of the exhaust fans 30 is 1.
In another embodiment, the primary exhaust filter 32 is disposed at the exhaust silencing channel 31 near the exhaust inlet 12, and a silencing gap is formed between the primary exhaust filter 32 and the exhaust inlet 12, so as to increase the primary exhaust filter for sound absorption, thereby meeting the requirement of a user on silencing of indoor noise. Similarly, the fresh air silencing channel can be additionally provided with a middle-effect filter at the front end of the fresh air high-efficiency filter 50, so that the air quality of fresh air can be improved, and sound can be further absorbed on the other hand.
In this embodiment, the back, side or top bottom surface can be selected to the business turn over wind gap of new trend, exhaust, and the mounting means can fall to the ground, hanging, three kinds of selections of furred ceiling, adaptable multiple installation condition of user. When the installation structure of the machine body 10 is a floor type structure, the bottom of the machine body 10 is provided with feet, the fresh air inlet 11 is arranged on the back or bottom surface of the machine body 10, the fresh air outlet 13 is arranged on the side or front surface of the machine body 10, the exhaust air inlet 12 is arranged on the side surface of the machine body 10, and the exhaust air outlet 14 is arranged on the back or top surface of the machine body 10; when the installation structure of the machine body 10 is a wall-mounted structure, the fresh air inlet 11 is arranged on the back or bottom of the machine body 10, the fresh air outlet 13 is arranged on the side or front of the machine body 10, the exhaust air inlet 12 is arranged on the side or bottom of the machine body 10, and the exhaust air outlet 14 is arranged on the back or top of the machine body 10; when the mounting structure of the machine body 10 is a ceiling type structure, the corners of the top and bottom surfaces of the machine body 10 are provided with lifting lugs, the fresh air inlet 11 is arranged on the bottom surface of the machine body 10, the fresh air outlet 13 is arranged on the side surface of the machine body 10, the exhaust air inlet 12 is arranged on the side surface or bottom surface of the machine body 10, and the exhaust air outlet 14 is arranged on the top surface of the machine body 10.
For example, when a floor type installation pipeline is selected for air supply, the bottom is additionally provided with bottom feet, a fresh air outlet 13 is connected with the pipeline from the left side for air supply to the indoor, and a fresh air inlet 11 of the fresh air outlet can be connected with the pipeline from the back or the bottom for air supply from the outdoor; the air exhaust inlet 12 is arranged at the lower part of the right side, the air exhaust outlet 14 is arranged at the back or the top of the upper part, and the connecting pipe exhausts the indoor dirty air to the outside; when floor type direct blowing wind is selected, the fresh air outlet 13 is arranged at the upper part of the front surface of the machine, and the rest is the same as the above;
for example, when a wall-mounted installation pipeline is selected for air supply, the fresh air outlet 13 is arranged on the left side, and the fresh air inlet 11 is arranged on the lower part or the bottom surface of the back; the air exhaust inlet 12 can be arranged at the lower part or the bottom surface of the right side and is connected with an air exhaust pipe to an indoor air return inlet, the air exhaust outlet 14 can be arranged at the upper part or the top of the back surface and is connected with a pipe to be led outdoors; when wall-mounted direct blowing wind is selected, the fresh air outlet 13 is arranged at the upper part of the front surface, and the exhaust air inlet 12 can be arranged at the lower part of the right side or the bottom surface without connecting a pipeline;
for example, when the suspended ceiling is selected to be installed, lifting lugs are installed at four corners of the top and bottom surfaces, the fresh air outlet 13 is arranged at the upper left portion, the fresh air inlet 11 is arranged at the left portion of the bottom surface, the exhaust air outlet 14 is arranged at the top surface, the exhaust air inlet 12 is arranged at the lower right portion or the right portion of the bottom surface, and the inlets and the outlets are connected with pipelines.
The utility model discloses a bidirectional flow does not take clean new fan's of heat recovery and low noise theory of operation to be:
the fresh air fan 20 introduces outdoor fresh air (fresh air) from a fresh air inlet 11, sequentially passes through the filter screens of the fresh air primary filter 40 and the fresh air high-efficiency filter 50 (the middle effect can be increased according to the needs of users), and is sent into the room from a fresh air outlet 13, wherein the noise of the fresh air fan 20 passes through 2-4 silencing chambers of the fresh air and is silenced through the filter screens of the fresh air primary filter 40 and the fresh air high-efficiency filter 50 (the middle effect can be added according to the needs of the users); the air exhaust fan 30 introduces indoor dirty air from the air exhaust inlet 12, and exhausts the air to the outdoor through the filter screen of the primary air exhaust filter 32 (the user has high requirement on indoor noise), and the air exhaust silencing channel 31 silences the air and exhausts the air to the outdoor.
In this embodiment, as shown in fig. 1, an access door and a door lock 15 are provided on a side surface of the machine body 10 to open the machine body 10 for access. The front of the body 10 is provided with a display control screen for controlling the start and stop of the device and setting of the device.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A clean fresh air fan with low noise and no heat recovery in bidirectional flow is characterized by comprising a machine body, a fresh air fan, an exhaust fan, a fresh air primary filter and a fresh air high-efficiency filter, wherein the fresh air fan, the exhaust fan, the fresh air primary filter and the fresh air high-efficiency filter are arranged in the machine body; the fresh air inlet and the air exhaust inlet are arranged at the same end of the machine body, and the fresh air outlet and the air exhaust outlet are arranged at the other end of the machine body; the fresh air fan is arranged between the fresh air primary filter and the fresh air high-efficiency filter, a first fresh air silencing chamber is arranged between the fresh air primary filter and the fresh air fan, and a second fresh air silencing chamber is arranged between the fresh air fan and the fresh air high-efficiency filter; the exhaust fan is arranged at the exhaust outlet, and an exhaust silencing channel is arranged between the exhaust fan and the exhaust inlet.
2. A bi-directional flow clean fresh air machine without heat recovery and with low noise as claimed in claim 1 wherein the area of said first fresh air muffling chamber is larger than the area of said second fresh air muffling chamber.
3. A bi-directional flow clean fresh air machine without heat recovery and with low noise as claimed in claim 2 wherein a mounting plate is provided between said first fresh air anechoic chamber and said second fresh air anechoic chamber, said fresh air machine being mounted on said mounting plate.
4. The clean fresh air machine with low noise and no heat recovery of bidirectional flow of claim 2, wherein a third fresh air silencing chamber is arranged between the fresh air primary filter and the fresh air inlet, a fourth fresh air silencing chamber is arranged between the fresh air high-efficiency filter and the fresh air outlet, the first fresh air silencing chamber, the second fresh air silencing chamber, the third fresh air silencing chamber and the fourth fresh air silencing chamber form a fresh air silencing channel, and silencing cotton is attached to the inner wall of the fresh air silencing channel.
5. The clean fresh air machine with low noise and without heat recovery of bi-directional flow of claim 4, wherein the length of the exhaust silencing passage is greater than the length of the fresh air silencing passage.
6. The clean fresh air machine with bidirectional flow, no heat recovery and low noise according to claim 5, wherein the exhaust silencing channel has an inverted L-shaped longitudinal section.
7. The clean fresh air machine with low noise and no heat recovery of bi-directional flow of claim 6, wherein the inner wall of the exhaust silencing channel is adhered with silencing cotton.
8. The clean fresh air machine with low noise and without heat recovery of bi-directional flow of claim 1, wherein the exhaust silencing passage is provided with an exhaust primary filter near the exhaust inlet, and a silencing gap is provided between the exhaust primary filter and the exhaust inlet.
9. The clean fresh air machine with bidirectional flow, no heat recovery and low noise of claim 1, wherein the installation structure of the machine body is one of a floor type structure, a wall-mounted structure and a ceiling type structure.
10. The clean fresh air machine with bidirectional flow, no heat recovery and low noise as claimed in claim 9, wherein when the installation structure of the machine body is a floor type structure, the bottom of the machine body is provided with feet, the fresh air inlet is arranged on the back or bottom surface of the machine body, the fresh air outlet is arranged on the side or front surface of the machine body, the exhaust air inlet is arranged on the side surface of the machine body, and the exhaust air outlet is arranged on the back or top surface of the machine body;
when the mounting structure of the machine body is a wall-mounted structure, the fresh air inlet is arranged on the back surface or the bottom surface of the machine body, the fresh air outlet is arranged on the side surface or the front surface of the machine body, the exhaust air inlet is arranged on the side surface or the bottom surface of the machine body, and the exhaust air outlet is arranged on the back surface or the top surface of the machine body;
when the mounting structure of the machine body is of a ceiling type structure, lifting lugs are arranged at corners of the top bottom surface of the machine body, the fresh air inlet is formed in the bottom surface of the machine body, the fresh air outlet is formed in the side surface of the machine body, the air exhaust inlet is formed in the side surface or the bottom surface of the machine body, and the air exhaust outlet is formed in the top surface of the machine body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223062097.8U CN218781409U (en) | 2022-11-18 | 2022-11-18 | Clean fresh air machine with bidirectional flow, no heat recovery and low noise |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223062097.8U CN218781409U (en) | 2022-11-18 | 2022-11-18 | Clean fresh air machine with bidirectional flow, no heat recovery and low noise |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218781409U true CN218781409U (en) | 2023-03-31 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223062097.8U Active CN218781409U (en) | 2022-11-18 | 2022-11-18 | Clean fresh air machine with bidirectional flow, no heat recovery and low noise |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218781409U (en) |
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2022
- 2022-11-18 CN CN202223062097.8U patent/CN218781409U/en active Active
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