CN221074691U - Fresh air fan - Google Patents

Abstract

The utility model provides a fresh air fan. The new trend fan includes: a first volute; the first volute and the second volute are oppositely arranged, and a fresh air channel is enclosed between the first volute and the second volute; the third volute is arranged opposite to the second volute, and an exhaust passage is formed between the third volute and the second volute in a surrounding mode; the first fan blade is arranged between the first volute and the second volute; the second fan blade is arranged between the second volute and the third volute; the driving part is connected with the second volute, and is provided with two output shafts, one of which is connected with the first fan blade, and the other of which is connected with the second fan blade; the driving part drives the first fan blade to rotate, the external fresh air is introduced into the target space through the fresh air channel, the driving part drives the second fan blade to rotate, the air flow in the target space is discharged out of the target space through the exhaust channel, and the problems of large installation space and high cost of two fan systems are solved.

Description

Fresh air fan

Technical Field

The utility model relates to the technical field of fresh air fans, in particular to a fresh air fan.

Background

At present, a fresh air fan is generally designed into a single air path, and external air is sucked from an air suction inlet of the fan after passing through a pipeline and a filtering assembly and is blown into a room from an air outlet of the fan. The fresh air system can only realize unidirectional ventilation and can not lead indoor polluted air to the outside of a room. If outdoor fresh air input and indoor polluted air discharge are to be realized at the same time, two fan systems are required to be arranged. However, the two fan systems have the problems of large installation space requirement, high noise, high cost, complex assembly process and the like.

In view of the above problems, no effective solution has been proposed.

Disclosure of utility model

The utility model mainly aims to provide a fresh air fan, which solves the problems of large installation space requirement, large noise, high cost and complex assembly process of a fan system adopting two sets of fan systems for bidirectional ventilation in the prior art.

In order to achieve the above object, according to one aspect of the present utility model, there is provided a fresh air fan comprising: a first volute; the first volute and the second volute are oppositely arranged, and a fresh air channel is enclosed between the first volute and the second volute; the third volute is arranged opposite to the second volute, and an exhaust passage is formed between the third volute and the second volute in a surrounding mode; the first fan blade is arranged between the first volute and the second volute; the second fan blade is arranged between the second volute and the third volute; the driving part is connected with the second volute, and is provided with two output shafts, one of which is connected with the first fan blade, and the other of which is connected with the second fan blade; the driving part drives the first fan blade to rotate so as to introduce external fresh air into the target space through the fresh air channel, and drives the second fan blade to rotate so as to discharge air flow in the target space out of the target space through the exhaust channel.

Further, the fresh air fan still includes: the filtering module is arranged at the fresh air inlet of the first volute.

Further, the second volute includes: the middle part of the plate body is provided with an annular bulge, a first avoidance channel is formed in the direction of one side of the annular bulge, an inner ring of the annular bulge is used for accommodating at least part of a driving part, one output shaft of the driving part is connected with a first fan blade through the first avoidance channel, and the first fan blade is arranged along the circumferential direction of the annular bulge.

Further, the second volute further includes: the first bounding wall, the circumference extension setting of first bounding wall along the plate body first side, the both ends of first bounding wall have the setting of distance ground to form the new trend export of at least partial new trend passageway, enclose between first bounding wall, plate body and the first spiral case and establish into new trend passageway.

Further, the second volute further includes: the second coaming extends along the circumference of the second side of the plate body, and two ends of the second coaming are arranged at intervals to form an exhaust outlet of at least part of the exhaust channel, and the exhaust channel is surrounded among the second coaming, the plate body and the third volute.

Further, the fresh air fan still includes: the protection cover is connected with at least one of the second volute and the third volute, an accommodating cavity for accommodating the driving part is formed between the protection cover and the annular bulge in a surrounding mode, a second avoidance channel for allowing one output shaft of the driving part to pass through is formed in one side of the protection cover, facing the third volute, of the protection cover, and the maximum outer diameter of the protection cover is smaller than the minimum inner diameter of the second fan blade.

Further, the circumference of the protection cover is provided with a plurality of first connection lugs.

Further, a first clamping structure group and a second clamping structure group are respectively arranged on the outer surface of the second volute, each of the first clamping structure group and the second clamping structure group comprises a plurality of clamping structures, the second volute is clamped with the first volute through the first clamping structure group, and the second volute is clamped with the third volute through the second clamping structure group.

Further, the clamping structure is a protrusion convexly arranged on the outer surface of the second volute, and the first volute and the third volute are provided with clamping holes matched with the protrusion.

Further, the edge of the first volute and the edge of the third volute are convexly provided with clamping blocks matched with the protrusions, and clamping holes are formed in the clamping blocks.

Further, at least one of the first volute and the third volute is provided with a guide post, and the first coaming and the second coaming are provided with guide structures for the guide post to be inserted, wherein the guide structures comprise at least one of guide grooves and guide gaps.

Further, the first coaming and the second coaming are provided with connecting posts, and the first volute and the third volute are provided with second connecting protrusions matched with the connecting posts.

Further, the plane of the fresh air outlet of the fresh air channel is perpendicular to the plane of the air exhaust outlet of the air exhaust channel.

Further, the flow area of the fresh air channel is Q1, and the flow area of the exhaust channel is Q2, wherein Q1/Q2 is less than or equal to 1.4.

Further, the first fan blade and the second fan blade comprise blades and annular impellers, the blades are arranged at intervals along the circumferential direction of the annular impellers, the first ends of the blades are arranged close to the outer ring of the annular impellers, the second ends of the blades extend towards one side of the inner ring of the annular impellers gradually along the circumferential direction of the annular impellers, wherein an included angle between an extension line of an air guide surface at the first end of each blade and a tangent line at the first end of the corresponding blade is beta, and the included angle is 153 degrees or more and less than or equal to 163 degrees.

Further, the diameter of the outer ring was 148mm and the diameter of the inner ring was 125mm.

By applying the technical scheme of the utility model, the fresh air fan is provided with the first volute, the second volute and the third volute, a fresh air channel is arranged between the first volute and the second volute in a surrounding manner, an exhaust channel is arranged between the third volute and the second volute in a surrounding manner, one of two output shafts of the driving part is connected with the first fan blade, the other output shaft is connected with the second fan blade, the driving part drives the first fan blade to rotate so as to introduce external fresh air into a target space through the fresh air channel, and the driving part drives the second fan blade to rotate so as to exhaust air flow in the target space outside the target space through the exhaust channel. According to the fresh air fan, outdoor fresh air input and indoor dirty air discharge can be simultaneously realized by using one fan system, the scheme that two fan systems are respectively used for outdoor fresh air input and indoor dirty air discharge in the prior art is replaced, and the problems that the fan systems adopting two fan systems for bidirectional ventilation in the prior art are large in installation space requirement, large in noise, high in cost and complex in assembly process are solved.

Drawings

The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model. In the drawings:

fig. 1 shows a schematic structural view of a first embodiment of a fresh air fan according to the utility model;

FIG. 2 shows a schematic structural view of a second embodiment of a fresh air blower according to the utility model;

FIG. 3 shows a schematic structural view of a third embodiment of a fresh air fan according to the present utility model;

Fig. 4 shows a schematic structural view of a fourth embodiment of a fresh air fan according to the utility model;

FIG. 5 shows a schematic structural view of a fifth embodiment of a fresh air blower according to the utility model;

FIG. 6 shows a schematic structural view of a sixth embodiment of a fresh air blower according to the utility model;

FIG. 7 shows a schematic structural view of a seventh embodiment of a fresh air blower according to the utility model;

FIG. 8 shows a schematic structural view of an eighth embodiment of a fresh air blower according to the present utility model;

FIG. 9 shows a schematic structural view of a ninth embodiment of a fresh air blower according to the utility model;

fig. 10 shows a schematic structural view of a tenth embodiment of a fresh air fan according to the present utility model.

Wherein the above figures include the following reference numerals:

10. a first volute; 100. a guide post; 101. a guide structure; 11. a fresh air inlet;

20. A second volute; 200. a plate body; 201. an annular protrusion; 202. a first avoidance channel; 203. a first coaming; 204. a second coaming; 205. a connecting column;

21. A fresh air channel; 211. a fresh air outlet;

22. A first clamping structure group; 23. the second clamping structure group;

30. a third volute; 300. a second connection protrusion;

31. An exhaust passage; 311. an exhaust outlet;

40. A first fan blade;

50. A second fan blade;

60. a driving section;

70. A filtration module;

80. A protective cover; 81. a second avoidance channel; 82. a first connection lug;

90. And a clamping block.

Detailed Description

It should be noted that, without conflict, the embodiments of the present utility model and features of the embodiments may be combined with each other. The utility model will be described in detail below with reference to the drawings in connection with embodiments.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

Exemplary embodiments according to the present application will now be described in more detail with reference to the accompanying drawings. These exemplary embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of these exemplary embodiments to those skilled in the art, that in the drawings, it is possible to enlarge the thicknesses of layers and regions for clarity, and that identical reference numerals are used to designate identical devices, and thus descriptions thereof will be omitted.

Referring to fig. 1 to 10, a fresh air fan is provided according to an embodiment of the present utility model.

Specifically, this new trend fan includes: the first volute 10, the second volute 20, the third volute 30, the first fan blade 40, the second fan blade 50 and the driving part 60 are arranged opposite to the second volute 20, and a fresh air channel 21 is defined between the first volute 10 and the second volute 20; the third volute 30 is arranged opposite to the second volute 20, and an exhaust passage 31 is enclosed between the third volute 30 and the second volute 20; the first fan blade 40 is arranged between the first volute 10 and the second volute 20; the second fan blade 50 is arranged between the second volute 20 and the third volute 30; the driving part 60 is connected with the second volute 20, the driving part 60 is provided with two output shafts, one of the two output shafts is connected with the first fan blade 40, and the other output shaft is connected with the second fan blade 50; the driving portion 60 drives the first fan blade 40 to rotate so as to introduce external fresh air into the target space through the fresh air channel 21, and the driving portion 60 drives the second fan blade 50 to rotate so as to discharge air flow in the target space out of the target space through the air exhaust channel 31.

In this embodiment, as shown in fig. 1, a first volute 10, a second volute 20, and a third volute 30 are provided, a fresh air channel 21 is defined between the first volute 10 and the second volute 20, an exhaust channel 31 is defined between the third volute 30 and the second volute 20, one of two output shafts of a driving part 60 is connected with a first fan blade 40, the other output shaft is connected with a second fan blade 50, the driving part 60 drives the first fan blade 40 to rotate, so as to introduce external fresh air into a target space through the fresh air channel 21, and the driving part 60 drives the second fan blade 50 to rotate, so that air flow in the target space is exhausted out of the target space through the exhaust channel 31. The fresh air fan can realize outdoor fresh air input and indoor dirty air discharge simultaneously by using a fan system with simple installation, replaces the scheme that two sets of fan systems are respectively used for outdoor fresh air input and indoor dirty air discharge in the prior art, reduces the number of parts, facilitates assembly and later maintenance and replacement, saves installation space, reduces use cost, solves the problems that the fan system with two sets of fan systems for bidirectional ventilation in the prior art has large installation space requirement, high noise, high cost and complex assembly process, and improves the practicability of the fresh air fan.

Further, the fresh air fan further comprises a filtering module 70, and the filtering module 70 is arranged at the fresh air inlet 11 of the first volute 10.

In this embodiment, as shown in fig. 2, the filtering module 70 is disposed at the fresh air inlet 11 of the first volute 10, so as to filter and purify the outdoor fresh air, and the filtered air is input into the room through the fresh air inlet 11 and the fresh air channel 21, and the flow path of the outdoor air into the room is shown in the direction a in fig. 2.

Further, the second volute 20 includes a plate body 200, an annular protrusion 201 is disposed in the middle of the plate body 200, a first avoidance channel 202 is disposed on one side of the annular protrusion 201 facing the first volute 10, an inner ring of the annular protrusion 201 is used for accommodating at least part of the driving portion 60, one output shaft of the driving portion 60 is connected with the first fan blade 40 through the first avoidance channel 202, and the first fan blade 40 is disposed along a circumferential direction of the annular protrusion 201.

In this embodiment, as shown in fig. 3, an annular protrusion 201 is disposed in the middle of the plate body 200, a cavity formed by the annular protrusion 201 is used for placing the driving portion 60, and, as shown in fig. 1, one of output shafts of the driving portion 60 is connected with the first fan blade 40 through a first avoiding channel 202, so as to realize power transmission when the driving portion 60 drives the first fan blade 40 to rotate, the first fan blade 40 is disposed along the circumferential direction of the annular protrusion 201, so that the first fan blade 40 rotates, and outdoor fresh air filtered by the filtering module 70 is sucked into the fresh air inlet 11 and then is input into a room through the fresh air channel 21, so that input of the outdoor fresh air is completed.

Further, the second volute 20 further includes a first shroud 203, where the first shroud 203 extends along a circumference of the first side of the plate 200, two ends of the first shroud 203 are disposed with a distance therebetween to form at least a part of a fresh air outlet 211 of the fresh air channel 21, and the fresh air channel 21 is defined between the first shroud 203, the plate 200 and the first volute 10.

Referring to fig. 3, in this embodiment, a fresh air channel 21 is defined between the first shroud 203, the plate 200 and the first volute 10, and after outdoor fresh air filtered by the filter module 70 is sucked into the fresh air inlet 11, the fresh air is input into the room from a fresh air outlet 211 through the fresh air channel 21.

Further, the second volute 20 further includes a second shroud 204, where the second shroud 204 extends along a circumferential direction of the second side of the plate body 200, two ends of the second shroud 204 are disposed with a distance therebetween to form at least part of the exhaust outlet 311 of the exhaust channel 31, and the exhaust channel 31 is defined between the second shroud 204, the plate body 200 and the third volute 30.

In this embodiment, as shown in fig. 1 and 3, the exhaust channel 31 is enclosed between the second shroud 204, the plate 200 and the third volute 30, the driving part 60 drives the second fan blade 50 to rotate, and indoor dirty air is sucked into the exhaust channel 31 and then led out of the room through the exhaust outlet 311, so as to complete the discharge of indoor dirty air, and the flow path of indoor air outside the room is shown as the direction B in fig. 2.

Further, the fresh air fan further comprises a protection cover 80, the protection cover 80 is connected with at least one of the second volute 20 and the third volute 30, an accommodating cavity for accommodating the driving part 60 is enclosed between the protection cover 80 and the inner ring of the annular protrusion 201, a second avoiding channel 81 for allowing one output shaft of the driving part 60 to pass through is formed in one side of the protection cover 80 facing the third volute 30, and the maximum outer diameter of the protection cover 80 is smaller than the minimum inner diameter of the second fan blade 50.

As shown in fig. 1 and 3, an accommodating cavity for accommodating the driving part 60 is enclosed between the protective cover 80 and the inner ring of the annular protrusion 201, a second avoiding channel 81 is formed on one side of the protective cover 80 facing the third volute 30, one output shaft of the driving part 60 outputs power to drive the second fan blade 50 to rotate, indoor dirty air is sucked into the exhaust channel 31 and then is led out of the room through the exhaust outlet 311, and the exhaust of the indoor dirty air is completed, wherein the flow path of the indoor air outside the room is shown as a direction B in fig. 2.

Further, the protective cover 80 is circumferentially provided with a plurality of first connection lugs 82.

As shown in fig. 1, the first connecting lug 82 in the present embodiment is used for mounting and fixing the protection cover 80 such that a receiving chamber for receiving the driving part 60 is defined between the protection cover 80 and the inner ring of the annular protrusion 201.

Further, a first clamping structure set 22 and a second clamping structure set 23 are respectively arranged on the outer surface of the second volute 20, the first clamping structure set 22 and the second clamping structure set 23 comprise a plurality of clamping structures, the second volute 20 is clamped with the first volute 10 through the first clamping structure set 22, and the second volute 20 is clamped with the third volute 30 through the second clamping structure set 23.

In this embodiment, the second volute 20 is clamped with the first volute 10 through the first clamping structure group 22, the second volute 20 is clamped with the third volute 30 through the second clamping structure group 23, and the second volute 20 is connected in a clamping manner, so that the installation process and the disassembly process of the fresh air fan are more convenient, the installation is convenient, the installation efficiency is improved, the material cost is saved, the later maintenance difficulty and the maintenance cost are reduced, and the application range of the fresh air fan is enlarged.

Further, the clamping structure is a protrusion convexly arranged on the outer surface of the second volute 20, and the first volute 10 and the third volute 30 are provided with clamping holes matched with the protrusion.

In this embodiment, the installation process of the fresh air fan is simpler and more convenient due to the arrangement, the number of used parts is reduced, and meanwhile, the labor cost and the time cost are saved.

Further, the edges of the first volute 10 and the third volute 30 are convexly provided with a clamping block 90 matched with the protrusion, and the clamping block 90 is provided with a clamping hole.

Referring to fig. 1 and 3, in this embodiment, the second volute 20 is clamped with the clamping block 90 on the first volute 10 through the first clamping structure group 22, and the second volute 20 is clamped with the clamping block 90 on the first volute 10 through the second clamping structure group 23 and the third volute 30, so that the installation process and the disassembly process of the fresh air fan are more convenient, and the fresh air fan is convenient to disassemble, assemble and maintain.

Further, at least one of the first scroll casing 10 and the third scroll casing 30 is provided with a guide post 100, and the first shroud 203 and the second shroud 204 are provided with a guide structure 101 for the guide post 100 to be inserted, wherein the guide structure 101 includes at least one of a guide groove and a guide notch.

Referring to fig. 1, in this embodiment, the third volute 30 is provided with a guide post 100, the second coaming 204 is provided with a guide structure 101 for inserting the guide post 100, and the guide post 100 and the guide structure 101 cooperate to complete the axial positioning of the first volute 10, the second volute 20 and the third volute 30 before installation, so that the installation process is more convenient and accurate, and the installation efficiency of the fresh air fan is improved.

Further, the first shroud 203 and the second shroud 204 are each provided with a connection post 205, and the first volute 10 and the third volute 30 are each provided with a second connection protrusion 300 that mates with the connection post 205.

In this embodiment, as shown in fig. 3, the first shroud 203 and the second shroud 204 are both provided with the connection post 205, and as shown in fig. 1, the first scroll 10 and the third scroll 30 are both provided with the second connection protrusion 300 matched with the connection post 205, and in the process of installing the first scroll 10, the second scroll 20 and the third scroll 30, the connection post 205 and the second connection protrusion 300 play a role in axial positioning, besides, the connection of the connection post 205 and the second connection protrusion 300 can further strengthen the installation strength between the first scroll 10, the second scroll 20 and the third scroll 30 of the second scroll 20, increase the installation stability of the fresh air fan, make the connection of the first scroll 10, the second scroll 20 and the third scroll 30 of the second scroll 20 more firm, and improve the reliability of the fresh air fan.

Further, the plane of the fresh air outlet 211 of the fresh air channel 21 is perpendicular to the plane of the air exhaust outlet 311 of the air exhaust channel 31. In this embodiment, as shown in fig. 4, this is so arranged that the outdoor fresh air input and the indoor dirty air discharge are performed simultaneously, without interfering with each other.

Further, the flow area of the fresh air channel 21 is Q1, and the flow area of the exhaust channel 31 is Q2, wherein Q1/Q2 is less than or equal to 1.4. Referring to fig. 2 and 5 and 6, in an embodiment of the present application, the flow area of the fresh air channel 21 is Q1, q1=4036 mm ², the flow area of the exhaust channel 31 is Q2, q2=2905 mm ², and q1/q2≡1.39, so that the fresh air fan co-workers can be better ensured to complete the operation of outdoor fresh air input and indoor dirty air.

Further, the first fan blade 40 and the second fan blade 50 each include a blade and an annular impeller, the plurality of blades are arranged at intervals along the circumferential direction of the annular impeller, the first end of each blade is arranged near the outer ring of the annular impeller, the second end of each blade extends gradually towards one side of the inner ring of the annular impeller along the circumferential direction of the annular impeller, wherein an included angle between an extension line of the air guiding surface at the first end of the blade and a tangent line at the first end of the corresponding blade is beta, and the included angle is 153 degrees or more and less than or equal to 163 degrees.

Referring to fig. 7, an included angle between an extension line of the air guiding surface at the first end of the first fan blade 40 and a tangent line at the first end of the corresponding fan blade is β, and an included angle between an extension line of the air guiding surface at the first end of the first fan blade 40 and a tangent line at the first end of the corresponding fan blade is β, β=158°, so that the air guiding efficiency of the first fan blade 40 can be improved, and the operation efficiency of the fresh air fan is improved.

In another embodiment of the present application, as shown in fig. 8, an included angle between an extension line of the air guiding surface at the first end of the second fan blade 50 and a tangent line at the first end of the corresponding blade is β, and an included angle between an extension line of the air guiding surface at the first end of the second fan blade 50 and a tangent line at the first end of the corresponding blade is β, β=158°, so that the air guiding efficiency of the first fan blade 40 and the second fan blade 50 can be improved, and further the operation efficiency of the fresh air fan is improved.

Further, in another embodiment of the application, the diameter of the outer ring of the fresh air fan is 148mm, and the diameter of the inner ring is 125mm. The diameter of the fresh air fan is limited, so that the purposes of small occupied space and convenience in installation are achieved, and the application range of the fresh air fan is wider.

In another embodiment of the present application, as shown in fig. 9 and 10, the maximum outer diameter of the protection cover 80 is 88.6mm, the height of the protection cover 80 is 26.5mm, the minimum inner diameter of the protection cover 80 is 41.5mm, and the height of the annular flange at the second avoidance channel 81 in the protection cover 80 is 4.7mm, so that the structure of the fresh air fan is more compact and convenient to install.

From the above description, it can be seen that the above embodiments of the present utility model achieve the following technical effects:

The first volute 10, the second volute 20 and the third volute 30 are arranged, a fresh air channel 21 is formed between the first volute 10 and the second volute 20 in a surrounding mode, an exhaust channel 31 is formed between the third volute 30 and the second volute 20 in a surrounding mode, one of two output shafts of the driving part 60 is connected with the first fan blade 40, the other output shaft is connected with the second fan blade 50, the driving part 60 drives the first fan blade 40 to rotate so as to introduce external fresh air into a target space through the fresh air channel 21, and the driving part 60 drives the second fan blade 50 to rotate so as to exhaust air flow in the target space outside the target space through the exhaust channel 31. The fresh air fan can realize outdoor fresh air input and indoor dirty air discharge simultaneously by using a fan system with simple installation, replaces the scheme that two sets of fan systems are respectively used for outdoor fresh air input and indoor dirty air discharge in the prior art, reduces the number of parts, facilitates assembly and later maintenance and replacement, saves installation space, reduces use cost, solves the problems that the fan system with two sets of fan systems for bidirectional ventilation in the prior art has large installation space requirement, high noise, high cost and complex assembly process, and improves the practicability of the fresh air fan.

The first shroud 203 extends along the circumference of the first side of the plate 200, and two ends of the first shroud 203 are arranged at a distance to form at least part of the fresh air outlet 211 of the fresh air channel 21, and the fresh air channel 21 is surrounded among the first shroud 203, the plate 200 and the first volute 10. One of the output shafts of the driving part 60 is connected with the first fan blade 40 through the first avoiding channel 202 so as to realize power transmission when the driving part 60 drives the first fan blade 40 to rotate, the first fan blade 40 is arranged along the circumference of the annular bulge 201, the first fan blade 40 is convenient to rotate, and outdoor fresh air filtered by the filtering module 70 is sucked into the fresh air inlet 11 and then is input into a room through the fresh air channel 21, so that the input of the outdoor fresh air is completed.

The second volute 20 further includes a second shroud 204, where the second shroud 204 extends along a circumferential direction of the second side of the plate body 200, two ends of the second shroud 204 are disposed with a distance therebetween to form an exhaust outlet 311 of at least a part of the exhaust passage 31, and the exhaust passage 31 is defined between the second shroud 204, the plate body 200, and the third volute 30. The housing cavity for housing the driving part 60 is enclosed between the protective cover 80 and the inner ring of the annular bulge 201, the second avoidance channel 81 is formed on one side of the protective cover 80 facing the third volute 30, one output shaft of the driving part 60 outputs power to drive the second fan blade 50 to rotate, indoor dirty air is sucked into the exhaust channel 31 and then is guided out of the room through the exhaust outlet 311, and the indoor dirty air is discharged.

The second spiral case 20 passes through first joint structure group 22 and first spiral case 10 joint, and second spiral case 20 passes through second joint structure group 23 and third spiral case 30 joint, uses the mode of joint to be connected, makes new trend fan's installation and dismantlement process all more convenient, and the installation of being convenient for promotes installation effectiveness, saves material cost, reduces later maintenance degree of difficulty and cost of maintenance, has increased the application scope of this new trend fan.

The third spiral case 30 is provided with the guide post 100, and the second coaming 204 is provided with the guide structure 101 for the guide post 100 to be inserted, and the guide post 100 and the guide structure 101 are matched to complete the axial positioning of the first spiral case 10, the second spiral case 20 and the third spiral case 30 before installation, so that the installation process is more convenient and accurate, and the installation efficiency of the fresh air fan is improved.

The first coaming 203 and the second coaming 204 are both provided with a connecting post 205, and in combination with the illustration in fig. 1, the first volute 10 and the third volute 30 are both provided with a second connecting protrusion 300 matched with the connecting post 205, and in the process of installing the first volute 10, the second volute 20 and the third volute 30, the connecting post 205 and the second connecting protrusion 300 play a role in axial positioning, besides, the connection of the connecting post 205 and the second connecting protrusion 300 can further strengthen the installation strength between the first volute 10, the second volute 20 and the third volute 30, and the installation stability of the fresh air fan is increased.

Spatially relative terms, such as "above … …," "above … …," "upper surface on … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition to the foregoing, references in the specification to "one embodiment," "another embodiment," "an embodiment," etc., indicate that the particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the utility model, as generally described. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is intended that such feature, structure, or characteristic be implemented within the scope of the utility model.

In the foregoing embodiments, the descriptions of the embodiments are emphasized, and for parts of one embodiment that are not described in detail, reference may be made to related descriptions of other embodiments.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (16)

1. A fresh air fan, characterized by comprising:

a first volute (10);

The first volute (10) and the second volute (20) are oppositely arranged, and a fresh air channel (21) is formed between the first volute (10) and the second volute (20) in a surrounding mode;

The third volute (30) is arranged opposite to the second volute (20), and an exhaust channel (31) is formed between the third volute (30) and the second volute (20) in a surrounding mode;

The first fan blade (40) is arranged between the first volute (10) and the second volute (20);

The second fan blade (50) is arranged between the second volute (20) and the third volute (30);

The driving part (60), the driving part (60) is connected with the second volute (20), the driving part (60) is provided with two output shafts, one of the two output shafts is connected with the first fan blade (40), and the other output shaft is connected with the second fan blade (50);

The driving part (60) drives the first fan blade (40) to rotate so as to introduce external fresh air into a target space through the fresh air channel (21), and the driving part (60) drives the second fan blade (50) to rotate so as to discharge air flow in the target space out of the target space through the air exhaust channel (31).

2. The fresh air fan of claim 1, further comprising:

The filtering module (70) is arranged at the fresh air inlet (11) of the first volute (10).

3. Fresh air fan according to claim 1 or 2, characterized in that the second volute (20) comprises:

The novel fan blade comprises a plate body (200), wherein an annular protrusion (201) is arranged in the middle of the plate body (200), a first avoidance channel (202) is formed in one side of a first volute (10) in the direction of the annular protrusion (201), an inner ring of the annular protrusion (201) is used for accommodating at least part of a driving part (60), one output shaft of the driving part (60) is connected with a first fan blade (40) through the first avoidance channel (202), and the first fan blade (40) is arranged along the circumferential direction of the annular protrusion (201).

4. A fresh air fan according to claim 3, wherein the second volute (20) further comprises:

The first coaming (203), the circumference extension setting of first coaming (203) along plate body (200) first side, the both ends of first coaming (203) have the distance ground setting to form at least part fresh air outlet (211) of fresh air passageway (21), enclose between first coaming (203) plate body (200) with first spiral case (10) become fresh air passageway (21).

5. Fresh air fan according to claim 4, characterized in that the second volute (20) further comprises:

The second coaming (204), the second coaming (204) is followed the circumference extension setting of plate body (200) second side, the both ends of second coaming (204) have the distance ground setting to form at least part exhaust outlet (311) of exhaust passageway (31), enclose between second coaming (204) plate body (200) and third spiral case (30) and establish exhaust passageway (31).

6. The fresh air fan of claim 3, further comprising:

The protection cover (80), protection cover (80) with at least one of second spiral case (20) and third spiral case (30) is connected, protection cover (80) with enclose between the inner circle of annular protruding (201) and establish to be used for holding hold chamber that holds of drive portion (60), the orientation of protection cover (80) one side of third spiral case (30) has been seted up and is used for supplying one of them of drive portion (60) the second that the output shaft passed dodges passageway (81), the biggest external diameter of protection cover (80) is less than the minimum internal diameter of second fan blade (50).

7. Fresh air fan according to claim 6, characterized in that the protective cover (80) is provided with a plurality of first connection lugs (82) in the circumferential direction.

8. The fresh air fan according to claim 1, wherein a first clamping structure group (22) and a second clamping structure group (23) are respectively arranged on the outer surface of the second volute (20), the first clamping structure group (22) and the second clamping structure group (23) comprise a plurality of clamping structures, the second volute (20) is clamped with the first volute (10) through the first clamping structure group (22), and the second volute (20) is clamped with the third volute (30) through the second clamping structure group (23).

9. The fresh air fan according to claim 8, wherein the clamping structure is a protrusion convexly arranged on the outer surface of the second volute (20), and the first volute (10) and the third volute (30) are provided with clamping holes matched with the protrusion.

10. Fresh air fan according to claim 9, characterized in that the edges of the first volute (10) and the third volute (30) are convexly provided with a clamping block (90) matched with the protrusion, and the clamping block (90) is provided with the clamping hole.

11. The fresh air fan according to claim 5, wherein at least one of the first volute (10) and the third volute (30) is provided with a guide post (100), and the first shroud (203) and the second shroud (204) are provided with a guide structure (101) into which the guide post (100) is inserted, wherein the guide structure (101) comprises at least one of a guide groove and a guide notch.

12. The fresh air fan according to claim 5, wherein the first shroud (203) and the second shroud (204) are provided with connecting posts (205), and the first volute (10) and the third volute (30) are provided with second connecting protrusions (300) matched with the connecting posts (205).

13. Fresh air fan according to claim 1, characterized in that the plane of the fresh air outlet (211) of the fresh air channel (21) is arranged perpendicular to the plane of the air outlet (311) of the air exhaust channel (31).

14. Fresh air fan according to claim 1, characterized in that the flow area of the fresh air channel (21) is Q1, and the flow area of the exhaust channel (31) is Q2, wherein Q1/Q2 is less than or equal to 1.4.

15. Fresh air fan according to claim 1, wherein the first fan blade (40) and the second fan blade (50) each comprise a blade and an annular impeller, a plurality of blades are arranged at intervals along the circumferential direction of the annular impeller, the first end of each blade is arranged close to the outer ring of the annular impeller, the second end of each blade extends towards one side of the inner ring of the annular impeller gradually along the circumferential direction of the annular impeller, wherein an included angle between an extension line of an air guiding surface at the first end of the blade and a tangent line at the first end of the corresponding blade is beta, and the included angle is 153 degrees less than or equal to beta is less than or equal to 163 degrees.

16. The fresh air fan of claim 15, wherein the outer race has a diameter of 148mm and the inner race has a diameter of 125mm.