CN212962155U

CN212962155U - Fresh air port structure and fresh air fan comprising same

Info

Publication number: CN212962155U
Application number: CN202021274044.0U
Authority: CN
Inventors: 古展彰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2020-07-02
Filing date: 2020-07-02
Publication date: 2021-04-13
Anticipated expiration: 2030-07-02

Abstract

The utility model discloses a fresh air tuyere structure and a fresh air fan comprising the same, wherein the fresh air tuyere structure comprises a tubular tuyere component so as to form a channel for outdoor air to enter in the tuyere component, and the air outlet end of the tuyere component is provided with an annular flange for connecting a unit shell; the air inlet component is arranged on the air inlet component and used for opening and closing the channel, and the air detection device is arranged in the channel and used for detecting the outdoor air condition and is positioned on one side, close to the air inlet end of the air inlet component, of the air valve component. So set up, design into an organic whole with blast gate subassembly and empty gas detection survey device and wind gap subassembly, connect the wind gap subassembly again on the unit casing, do not occupy unit inner space, because empty gas detection survey device is located the air inlet side of blast gate subassembly, when the operation inner loop mode, the passageway is closed, still can detect outdoor air situation, automatic switch operation mode.

Description

Fresh air port structure and fresh air fan comprising same

Technical Field

The utility model relates to a new fan technical field, more specifically say, relate to a new trend wind gap structure and including new trend fan of this new trend wind gap structure.

Background

Generally, the fresh air machine has two modes of total heat exchange and bypass, and in order to improve the capacity of the fresh air machine for dealing with outdoor severe air conditions, the fresh air machine is also provided with an internal circulation mode. When the new fan opened the inner loop mode, the indoor air of introducing the unit can be sent to indoorly through the inner loop passageway again, and in-process indoor air can reach air purification's effect through the filter screen, and new fan just is equivalent to an air purifier at this moment. When the unit starts the internal circulation mode, outdoor fresh air is not introduced, so when the outdoor temperature is lower than the unit operation temperature or the air condition is severe, the unit can still operate, and the unit operation range is enlarged.

In order to realize the internal circulation mode, an air valve is required to be installed at the fresh air inlet structure and used for closing the fresh air inlet so that outdoor air cannot enter the unit. However, in the existing fresh air machine, the fresh air inlet structure and the air valve are respectively installed on the machine set shell. The newly-increased blast gate occupies the space of unit like this, has increased the unit size, and in addition, the empty gas detection survey device of unit is generally installed inside the unit, when the unit when the operation inner loop mode, has closed the new trend entry, empty gas detection survey device can't detect outdoor air situation, the unit just also can't be according to outdoor air situation, automatic switch unit operational mode.

Therefore, how to solve the problem that the running mode of the unit cannot be automatically switched due to the fact that the air valve occupies the unit space, the unit size is increased, and the outdoor air condition cannot be detected when the unit runs in the internal circulation mode in the prior art becomes an important technical problem to be solved by technical personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a new trend wind gap structure reaches new fan including this new trend wind gap structure to solve prior art medium wind valve and occupy the unit space, increase unit size and the unable outdoor air situation of detection of unit when the operation inner loop mode, lead to the problem of unable automatic switch-over unit operational mode.

The utility model aims at realizing through the following technical scheme:

the utility model provides a fresh air tuyere structure, which comprises a tuyere component with a tubular structure, so that a channel for outdoor air to enter is formed inside the tuyere component, and the air outlet end of the tuyere component is provided with an annular flange for connecting a unit shell; the air inlet component is arranged on the air inlet component and used for opening and closing the air valve component of the channel, and the air detection device is arranged in the channel and used for detecting the outdoor air condition, and the air detection device is positioned on one side, close to the air inlet end of the air inlet component, of the air valve component.

Preferably, the air valve assembly comprises a rotatable air door for opening and closing the passage, a driving device for driving the air door to rotate, and a fixing frame for supporting the air door and connecting with the air port assembly.

Preferably, the air door is provided with a rotating shaft, and the air port assembly and the fixing frame are correspondingly provided with mounting grooves which are located at two ends of the rotating shaft and used for accommodating the rotating shaft.

Preferably, annular flanges are arranged at two ends of the rotating shaft, the air port assembly and the fixing frame are provided with limit grooves matched with the annular flanges, and the annular flanges extend into the limit grooves to limit axial displacement of the rotating shaft.

Preferably, the tuyere assembly and the fixing frame are correspondingly provided with first mounting holes for inserting fasteners, and the fasteners penetrate through the fixing frame and extend into the tuyere assembly so as to fixedly connect the tuyere assembly and the fixing frame.

Preferably, a clamping block is further arranged on the other side, opposite to the first mounting hole, of the tuyere assembly, and a clamping groove matched with the clamping block and allowing the clamping block to extend into is formed in the fixing frame.

Preferably, the driving device comprises a motor connected with one end of the rotating shaft and used for driving the rotating shaft to rotate, the motor is connected with the fixing frame, and the air port assembly is provided with a second accommodating cavity matched with the motor and used for accommodating the motor.

Preferably, the fixing frame is provided with a convex column for connecting the motor, and the motor is provided with a second mounting hole which is matched with the convex column and used for inserting the convex column.

Preferably, the fixing frame comprises an annular frame body and shaft seats which are arranged at two ends of the rotating shaft and connected with the annular frame body, the mounting groove is arranged on the shaft seats, the outer contour of the annular frame body is consistent with the inner contour of the channel, and the inner contour of the annular frame body is consistent with the outer contour of the air door.

Preferably, the air detection device is located on one side, close to the air inlet end, of the annular frame body, the air detection device is provided with a step structure matched with the annular frame body, and the annular frame body abuts against the step structure so as to fix the air detection device in the channel.

Preferably, the damper is circular or square, or comprises a square half body and a circular half body which are connected.

Preferably, the tuyere assembly further comprises a connecting pipe section for connecting a ventilation pipeline and a connecting section for connecting the connecting pipe section with the annular flange, and the annular flange is provided with a plurality of third mounting holes which are distributed along the circumferential direction of the annular flange and are used for connecting the unit shell.

Preferably, the rotation shaft is located at a middle position of the damper.

Preferably, the outdoor air condition comprises the temperature, and/or humidity, and/or particulate matter concentration, and/or volatile organic compound concentration of the outdoor air.

The utility model also provides a new fan, include as above arbitrary new trend wind gap structure.

In the technical scheme provided by the utility model, a fresh air tuyere structure comprises a tuyere component with a tubular structure, so that a channel for outdoor air to enter is formed inside the tuyere component, and an annular flange for connecting a unit shell is arranged at the air outlet end of the tuyere component; the air inlet component is arranged on the air inlet component and used for opening and closing the channel, and the air detection device is arranged in the channel and used for detecting the outdoor air condition and is positioned on one side, close to the air inlet end of the air inlet component, of the air valve component. So set up, design into an organic whole with blast gate subassembly and empty gas detection survey device and wind gap subassembly, connect the wind gap subassembly on the unit casing again, do not occupy the inside space of unit, and because empty gas detection survey device is located the air inlet side of blast gate subassembly, when the operation inner loop mode, the passageway is closed, still can detect outdoor air situation, automatic switch operation mode, thereby solved among the prior art blast gate occupation unit space, increase unit size and unit can't detect outdoor air situation when the operation inner loop mode, lead to the problem of unable automatic switch unit operation mode.

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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only 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 view of a fresh air port structure in an embodiment of the present invention;

FIG. 2 is an exploded view of the fresh air inlet structure in the embodiment of the present invention;

FIG. 3 is a partial schematic view of FIG. 2 at A;

FIG. 4 is a schematic view of the connection between the rotating shaft and the motor according to the embodiment of the present invention;

FIG. 5 is a partial schematic view of FIG. 4 at B;

fig. 6 is another schematic structural diagram of the damper according to the embodiment of the present invention.

In fig. 1-6:

1-air outlet end; 2-an annular flange; 3-an air detection device; 4-air inlet end; 5-a damper; 6, fixing a frame; 7-a rotating shaft; 8-mounting grooves; 9-an annular flange; 10-a limiting groove; 11-a fastener; 12-a first mounting hole; 13-a cartridge; 14-a card slot; 15-a motor; 16-a first accommodating cavity; 17-a second accommodating cavity; 18-a convex column; 19-a second mounting hole; 20-an annular frame; 21-axle seat; 22-a step structure; 23-a pipe connecting section; 24-a connecting segment; 25-a third mounting hole; 26-flat shaft; 27-a fourth mounting hole; 28-edge clamping; 29-a groove; 30-convex.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. It is to be understood that the embodiments described are only some embodiments of the invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments described below do not limit the scope of the invention described in the claims. Further, the entire contents of the configurations shown in the following embodiments are not limited to those necessary as a solution of the invention described in the claims.

Referring to fig. 1-6, the fresh air tuyere structure provided in this embodiment includes a tuyere assembly having a tubular structure, such that a channel for outdoor air to enter is formed inside the tuyere assembly, and an air outlet end 1 of the tuyere assembly is provided with an annular flange 2 for connecting a casing of a unit, thereby fixing the tuyere assembly on the unit. The fresh air port structure further comprises an air valve assembly arranged on the air port assembly and used for opening and closing the channel, and the air valve assembly is arranged at the air outlet end 1 and is convenient to install and maintain. Fig. 1 shows the state of opening the passage, when the unit is in the internal circulation mode, the air valve assembly can close the passage, and the outdoor air cannot enter the unit from the air outlet end 1. Fresh air wind gap structure is still including setting up in the passageway, an empty gas detection surveys device 3 for detecting outdoor air situation, as shown in fig. 3, the position that is close to air-out end 1 in the passageway is equipped with the first holding chamber 16 with empty gas detection surveys device 3 matched with, is used for placing empty gas detection surveys device 3, and empty gas detection surveys device 3 and is located the one side that the air valve subassembly is close to the air inlet end 4 of wind gap subassembly, that is to say, when the passageway was closed, empty gas detection surveys device 3 and is located the air inlet side, still can contact with outdoor air, detect outdoor air situation. So set up, with blast gate subassembly and empty gas detection survey device direct mount on the wind gap subassembly, connect the wind gap subassembly on the unit casing again, do not occupy the inside space of unit, make the wind gap subassembly have automatic switch-over channel switch and empty gas detection's function simultaneously, and because empty gas detection survey device is located the air inlet side of blast gate subassembly, when the operation inner loop mode, the passageway is closed, still can detect outdoor air situation, automatic switch operation mode, thereby solved prior art blast gate occupation unit space, increase unit size and unit unable detection outdoor air situation when the operation inner loop mode, lead to the problem of unable automatic switch-over unit operation mode.

As shown in fig. 1, the air valve assembly includes a rotatable air door 5 for opening and closing the passage, a driving device for driving the air door 5 to rotate, and a fixing frame 6 for supporting the air door 5 and connected to the air port assembly. When the machine set operates in the internal circulation mode, the driving device drives the air door to rotate, and the channel is closed. In the prior art, the air valve assembly is separately installed on the unit housing, and generally includes a lower base, an upper cover plate, an air door, a driving device, and the like. In the embodiment, the air port assembly is used as the mounting base and matched with the fixing frame, the air door and the driving device are mounted on the air port assembly, the number of structural parts is small, the assembly is simple and easy, and the mounting time is reduced.

Specifically, the air door 5 is provided with a rotating shaft 7, and the air port assembly and the fixing frame 6 are correspondingly provided with mounting grooves 8 which are located at two ends of the rotating shaft 7 and used for accommodating the rotating shaft 7. As shown in fig. 2, at both ends of the rotating shaft 7, the tuyere assembly and the fixing frame 6 are provided with mounting grooves 8 which are matched with the rotating shaft 7. Generally, the rotating shaft 7 is a circular shaft, and the mounting groove 8 can be correspondingly designed as a circular arc groove. At one end of the rotating shaft 7, two opposite mounting grooves 8 are enclosed to form a mounting space for accommodating and supporting the rotating shaft 7. Thus, the two ends of the rotating shaft 7 form an installation space for the rotating shaft to rotate, and the driving device can stably and effectively drive the rotating shaft 7 to rotate.

As shown in fig. 2, the two ends of the rotating shaft 7 are provided with annular flanges 9, the tuyere assembly and the fixing frame 6 are provided with limiting grooves 10 matched with the annular flanges 9, and the annular flanges 9 extend into the limiting grooves 10 to limit the axial displacement of the rotating shaft 7. Optionally, the limiting groove 10 is formed in the middle of the mounting groove 8, the structure is compact, the rotating shaft 7 is effectively prevented from moving along the axial direction of the rotating shaft, and the air door 5 is guaranteed to be driven to rotate stably.

In this embodiment, the tuyere assembly and the fixing frame 6 are correspondingly provided with first mounting holes 12 for inserting fasteners 11, and the fasteners 11 penetrate through the fixing frame 6 and extend into the tuyere assembly to fixedly connect the tuyere assembly and the fixing frame 6. Specifically, as shown in fig. 2, the air outlet end 1 of the tuyere assembly is provided with a plurality of first mounting holes 12, and the fixing frame 6 is fastened on the tuyere assembly by tightening screws. In order to enhance the connection reliability of the air inlet assembly and the air outlet assembly, a clamping block 13 is further arranged on the other side, opposite to the first mounting hole 12, of the air inlet assembly, and a clamping groove 14 matched with the clamping block 13 and allowing the clamping block 13 to extend into is formed in the fixing frame 6. During design, one end of the rotating shaft is provided with a plurality of first mounting holes 12, and the other end of the rotating shaft is provided with a clamping structure of a clamping block and a clamping groove. During the installation, insert the fixture block in the draw-in groove, cooperate the screw fastening simultaneously, install more firmly stable like this to fix the blast gate subassembly reliably on the wind gap subassembly. Moreover, the connecting structure is easy to disassemble, the screws on the fixing frame can be disassembled from the access hole of the unit, the air valve assembly can be disassembled for maintenance, and the overhauling is very convenient.

As shown in fig. 4, the driving device includes a motor 15 connected to one end of the rotating shaft 7 for driving the rotating shaft 7 to rotate, and the motor 15 is a stepping motor and can realize forward and reverse rotation. As shown in fig. 5, a flat shaft 26 is disposed at an end of an output shaft of the motor 15, a fourth mounting hole 27 matched with the flat shaft 26 is disposed at an end of the rotating shaft 7, and the flat shaft 26 is inserted into the fourth mounting hole 27, so that the flat shaft and the fourth mounting hole are tightly matched, and the rotating shaft 7 is effectively driven to rotate. When the machine set operates in the internal circulation mode, the stepping motor can be automatically controlled to drive the rotating shaft to rotate, so that the air door closes the channel. The motor 15 is connected with the fixed frame 6, and the air port assembly is provided with a second accommodating cavity 17 which is matched with the motor 15 and used for accommodating the motor 15. As shown in fig. 1, the air outlet end of the air outlet assembly is provided with a second accommodating cavity 17, the size of which is determined by the size of the motor 15, so that the motor 15 can be placed and the axial movement of the motor 15 can be limited.

Specifically, the fixing frame 6 is provided with a convex column 18 for connecting the motor 15, and the motor 15 is provided with a second mounting hole 19 which is matched with the convex column 18 and used for inserting the convex column 18. In order to install the motor 15, the fixing frame 6 is provided with an installation side plate, the installation side plate is provided with two convex columns 18 which are symmetrically distributed, and two second installation holes 19 in the motor 15 are respectively sleeved on the convex columns 18, so that the motor 15 in the second accommodating cavity 17 is suspended and fixed on the fixing frame 6, and the installation is convenient.

In this embodiment, the fixing frame 6 includes an annular frame 20 and shaft seats 21 disposed at two ends of the rotating shaft 7 and connected to the annular frame 20, and the mounting groove 8 is disposed on the shaft seats 21. Correspondingly, the air outlet end of the air outlet assembly is also correspondingly provided with an axle seat, and the mounting groove is arranged on the axle seat and used for supporting the rotating shaft. The outer contour of the annular frame 20 corresponds to the inner contour of the passage, and the inner contour of the annular frame 20 corresponds to the outer contour of the damper 5. The design like this, the axle bed at pivot both ends is fixed, is supported air door and pivot, and the installation of being convenient for guarantees the installation reliability, and annular framework cooperates with passageway, air door for the sealed between air door and the passageway. As an alternative embodiment, the damper 5 is circular or square. Alternatively, as shown in fig. 6, the damper 5 includes a square half and a circular half connected. As shown in fig. 4, the rotating shaft 7 is located at the middle position of the damper 5, and the air flow is facilitated when the damper 5 is opened.

In the preferred embodiment, the air detection device 3 is located on the side of the annular frame 20 close to the air inlet end 4, as shown in fig. 3, the air detection device 3 is provided with a step structure 22 matched with the annular frame 20, and the annular frame 20 abuts against the step structure 22 to fix the air detection device 3 in the channel. In order to better fix the air detection device 3, the annular frame body 20 is provided with the protrusion 30, the bottom surface of the protrusion 30 is a plane, the contact area is large when the protrusion abuts against the step structure 22, and the pressing effect is good. In addition, as shown in fig. 3, the air detection device 3 is further provided with clamping edges 28 at both sides thereof, and the tuyere assembly is correspondingly provided with grooves 29 which are matched with the clamping edges 28. During installation, the air detection device 3 is inserted into the first receiving cavity 16, the clamping edges 28 at two sides are respectively inserted into the grooves 29, and then the annular frame 20 abuts against the step structure 22, so that the air detection device 3 is effectively fixed.

In the embodiment of the utility model, the wind gap subassembly is still including being used for connecting air pipe's takeover section 23 and being used for connecting takeover section 23 and ring flange 2's linkage segment 24, and ring flange 2 is equipped with a plurality of third mounting holes 25 along 2 circumference evenly distributed of ring flange, be used for connecting the unit casing. Generally, the pipe connecting section 23 is a circular pipe, which is convenient for connecting with a ventilation pipeline and introducing outdoor fresh air, and the connecting section 24 plays a role in connecting the pipe connecting section 23 with the annular flange 2. The annular flange 2 of the air outlet end 1 is provided with four third mounting holes 25 which are screw holes and used for fixing the air port assembly. During installation, the air door, the stepping motor and the air detection device are arranged at corresponding positions of the air port assembly, the air port assembly is matched with the fixing frame and fixed at the air outlet end of the air port assembly through screws and clamping positions, and then the air port assembly is fixed on the whole machine through the screws. When the air valve assembly and the air detection device of the fresh air port need to be overhauled, the screws on the fixing frame can be detached from the overhauling port of the whole machine, so that the fixing frame can be detached to simultaneously bring the air door, the stepping motor and the air detection device, the whole air port assembly does not need to be detached, and simple overhauling is realized.

In this embodiment, the outdoor air condition includes the temperature, and/or humidity, and/or particulate matter concentration, and/or Volatile Organic Compound (VOC) concentration of the outdoor air. That is, the air detection device 3 may detect one or more of the temperature, humidity, particulate matter concentration, and VOC concentration of the air, which may be specifically determined according to the use requirement. The air detection device is installed on the air port assembly, when the air door is opened, the air condition of introduced fresh air can be detected, when the air door is in an operation internal circulation mode, the air door is closed, and due to the fact that the air detection device is arranged on the air inlet side of the air valve assembly, outdoor air condition can be detected still, and the operation mode is switched automatically.

This embodiment still provides a new fan, includes as above-mentioned description new trend wind gap structure. So set up, designed a new trend wind gap with blast gate and empty gas detection surveys device, be equipped with blast gate and empty gas detection surveys device on the wind gap, but the closing of automatic control wind gap and real-time detection outdoor air situation. The air valve, the air detection device and the air port are designed into a whole, the space inside the unit is not occupied, the number of assembly parts is reduced, and the assembly time is reduced. When the air valve is closed, the air detection device arranged on the air port can still detect the outdoor air condition, and the automatic switching of the operation mode of the unit is facilitated. The derivation process of the beneficial effect is approximately similar to that of the fresh air port structure, and therefore the derivation process is not repeated herein.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fresh air tuyere structure is characterized by comprising a tuyere component with a tubular structure so as to form a channel for outdoor air to enter inside the tuyere component, wherein an air outlet end (1) of the tuyere component is provided with an annular flange (2) for connecting a unit shell; the air inlet component is arranged on the air inlet component and used for opening and closing the air valve component of the channel, the air detection device (3) is arranged in the channel and used for detecting outdoor air conditions, and the air detection device (3) is located on one side, close to the air inlet end (4) of the air inlet component, of the air valve component.

2. Fresh air tuyere structure according to claim 1, characterized in that the air valve assembly comprises a rotatably disposed damper (5) for opening and closing the passage, a driving means for driving the damper (5) to rotate, and a holder (6) for supporting the damper (5) and connected to the tuyere assembly.

3. The fresh air tuyere structure of claim 2, wherein the air door (5) is provided with a rotating shaft (7), and the tuyere assembly and the fixing frame (6) are correspondingly provided with mounting grooves (8) which are located at both ends of the rotating shaft (7) and used for accommodating the rotating shaft (7).

4. The fresh air tuyere structure of claim 3, wherein annular flanges (9) are provided at both ends of the rotating shaft (7), the tuyere assembly and the fixing frame (6) are provided with limiting grooves (10) engaged with the annular flanges (9), and the annular flanges (9) extend into the limiting grooves (10) to limit axial displacement of the rotating shaft (7).

5. The fresh air tuyere structure of claim 2, wherein the tuyere assembly and the fixing frame (6) are correspondingly provided with first mounting holes (12) for inserting fasteners (11), and the fasteners (11) penetrate through the fixing frame (6) and extend into the tuyere assembly to fixedly connect the tuyere assembly and the fixing frame (6).

6. The fresh air tuyere structure of claim 5, wherein a clamping block (13) is further disposed on the other side of the tuyere assembly opposite to the first mounting hole (12), and a clamping groove (14) matched with the clamping block (13) and allowing the clamping block (13) to extend into is disposed on the fixing frame (6).

7. The fresh air tuyere structure of claim 3, wherein the driving device comprises a motor (15) connected with one end of the rotating shaft (7) for driving the rotating shaft (7) to rotate, the motor (15) is connected with the fixed frame (6), and the tuyere assembly is provided with a second accommodating cavity (17) which is matched with the motor (15) and is used for accommodating the motor (15).

8. The fresh air vent structure of claim 7, wherein the fixing frame (6) is provided with a convex column (18) for connecting the motor (15), and the motor (15) is provided with a second mounting hole (19) which is matched with the convex column (18) and is used for inserting the convex column (18).

9. The fresh air tuyere structure of claim 3, wherein the fixing frame (6) comprises an annular frame (20) and shaft seats (21) disposed at both ends of the rotating shaft (7) and connected with the annular frame (20), the mounting groove (8) is disposed on the shaft seat (21), the outer contour of the annular frame (20) is consistent with the inner contour of the passage, and the inner contour of the annular frame (20) is consistent with the outer contour of the air door (5).

10. The fresh air vent structure of claim 9, wherein the air detection device (3) is located on one side of the annular frame body (20) close to the air inlet end (4), the air detection device (3) is provided with a step structure (22) matched with the annular frame body (20), and the annular frame body (20) abuts against the step structure (22) to fix the air detection device (3) in the channel.

11. Fresh air tuyere structure according to claim 2, characterized in that the air door (5) is circular or square, or the air door (5) comprises a square half and a circular half connected together.

12. The fresh air tuyere structure of claim 1, wherein the tuyere assembly further comprises a pipe connecting section (23) for connecting a ventilation pipe and a connecting section (24) for connecting the pipe connecting section (23) with the annular flange (2), and the annular flange (2) is provided with a plurality of third mounting holes (25) distributed along the circumference of the annular flange (2) for connecting a casing of a unit.

13. Fresh air tuyere structure according to claim 3, wherein the rotation shaft (7) is located at a middle position of the damper (5).

14. The fresh air tuyere structure of claim 1, wherein the outdoor air condition includes a temperature, and/or a humidity, and/or a particulate matter concentration, and/or a volatile organic compound concentration of outdoor air.

15. A fresh air blower comprising a fresh air tuyere structure of any one of claims 1 to 14.