CN219868174U - Air conditioner indoor unit and guide rod thereof - Google Patents

Abstract

The utility model provides an air conditioner indoor unit and a guide rod thereof. The guide rod is used for being arranged at an air supply outlet of the shell of the air conditioner indoor unit and used for allowing air flow in the shell to bypass the guide rod and then blow out to the outside of the shell. The guide rod is of a hollow structure and is formed by mutually covering and clamping a strip-shaped first cover plate and a strip-shaped second cover plate. And the inner side surface of the first cover plate is provided with a plurality of first clamping parts, the inner side surface of the second cover plate is provided with a plurality of second clamping parts, and each first clamping part is clamped with one second clamping part. The utility model saves the cost of the guide rod, reduces the weight of the guide rod and optimizes the assembly structure of the guide rod.

Description

Air conditioner indoor unit and guide rod thereof

Technical Field

The utility model relates to the technical field of air conditioning, in particular to an air conditioner indoor unit and a guide rod thereof.

Background

The air flow in the shell bypasses the guide rod and then is blown out of the shell.

When the position of the guide rod is positioned at the inner side of the air supply port, the air flow can be guided to the air channel wall of the tapered section of the air channel adjacent to the air outlet by the guide rod, and the air flow is guided to be gradually polymerized by the air channel wall, so that the polymerized air supply effect is formed, and the wind power and the air supply distance are improved.

When the position of the guide rod is positioned at the outer side of the air supply opening, the air flow of the air outlet can be divided into two parts by the guide rod, so that a split-flow air supply effect is formed, the air supply is prevented from directly blowing the human body, and the air flow is more dispersed and comfortable.

Disclosure of Invention

An object of the present utility model is to provide a guide bar, which saves the cost of the guide bar, reduces the weight of the guide bar, and optimizes the assembly structure of the guide bar.

Another object of the present utility model is to provide an indoor unit of an air conditioner having the above-mentioned guide rod.

In one aspect, the present utility model provides a guide rod for an indoor unit of an air conditioner, configured to be installed at an air supply port of a casing of the indoor unit of the air conditioner, and configured to allow an air flow in the casing to bypass the guide rod and blow out to the outside of the casing;

the guide rod is of a hollow structure and is formed by mutually covering and clamping a strip-shaped first cover plate and a strip-shaped second cover plate; and is also provided with

The inner side surface of the first cover plate is provided with a plurality of first clamping parts;

the inner side surface of the second cover plate is provided with a plurality of second clamping parts, and each first clamping part is clamped with one second clamping part.

Optionally, the plurality of first clamping parts are distributed at intervals at two edges in the width direction of the first cover plate; and is also provided with

The second clamping portions are distributed at two edges of the second cover plate in the width direction at intervals.

Optionally, each first clamping portion is an elastic claw, and each second clamping portion has a clamping hole allowing the first clamping portion to be clamped in.

Optionally, when each of the first clamping portions is clamped into the clamping hole, the first clamping portion is located at a side of the second clamping portion away from the center of the second cover plate in the width direction.

Optionally, each edge of the first cover plate in the width direction has a positioning strip protruding toward the second cover plate; and is also provided with

Each edge of the second cover plate in the width direction is provided with a positioning groove, and each positioning strip is embedded into one positioning groove so as to restrict the relative position of the second cover plate and the first cover plate.

Optionally, each of the positioning strips extends along an edge in the width direction of the first cover plate; and is also provided with

Each of the positioning grooves is elongated extending along an edge in the width direction of the second cover plate.

Optionally, the thickness of each of the locating strips decreases gradually from the root to the end.

Optionally, the first cover plate comprises an arc-shaped plate-shaped main body plate and two end plates positioned at two ends of the main body plate in the length direction, and each end plate is used for forming two ends of the guide rod in the length direction; and is also provided with

The second cover plate is in an arc plate shape as a whole.

In another aspect, the present utility model also provides an indoor unit of an air conditioner, including:

a shell provided with an air supply port; and

at least one deflector rod according to any one of the preceding claims, which is arranged at the air supply opening so that the air flow in the housing is blown out of the housing after bypassing the deflector rod.

Optionally, an air duct connected with the air supply port is formed in the casing, and the distance between two opposite air guide walls of the air duct adjacent to the air supply port is gradually reduced along the air flow direction to form a tapered section;

the air guide rods are arranged in the air duct, and respectively define air outlet gaps with the two air guide walls, and are used for guiding the air flow blown to the air supply opening to the two air guide walls, so that the air flow gradually flows out of the air supply opening towards the air flow center in a polymerization manner under the guidance of the air duct converging section.

The guide rod is of a hollow structure, so that the cost of the guide rod can be saved, the weight of the guide rod can be reduced, and the middle collapse deformation of a longer guide rod can be reduced.

In addition, the guide rod is formed by buckling the first cover plate and the second cover plate, so that the guide rod is convenient to process, the first cover plate and the second cover plate are connected in a clamping manner, and the guide rod is more convenient to assemble and free of looseness.

Furthermore, in the guide rod, the first cover plate and the second cover plate are positioned in the width direction through the positioning strip and the positioning strip, so that after the first cover plate and the second cover plate are assembled, the joint of the outer surfaces of the first cover plate and the second cover plate can be aligned better.

The above, as well as additional objectives, advantages, and features of the present utility model will become apparent to those skilled in the art from the following detailed description of a specific embodiment of the present utility model when read in conjunction with the accompanying drawings.

Drawings

Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:

fig. 1 is a schematic view of an air conditioner indoor unit according to an embodiment of the present utility model;

fig. 2 is an enlarged view of a cross-sectional view of the indoor unit of the air conditioner shown in fig. 1;

FIG. 3 is a schematic view of a deflector rod according to an embodiment of the present utility model;

FIG. 4 is an exploded view of the deflector rod of FIG. 3;

FIG. 5 is a schematic view of the structure of FIG. 4 after the second shroud plate has been flipped 180;

FIG. 6 is an enlarged view at A of FIG. 5;

FIG. 7 is a cross-sectional view of the diverter stem of FIG. 3;

FIG. 8 is a schematic view of the deflector rod of FIG. 7 in an exploded condition where the first shroud plate meets the second shroud plate;

fig. 9 is a schematic end structure of the first cover plate.

Detailed Description

An air conditioner indoor unit and a guide rod thereof according to an embodiment of the present utility model are described below with reference to fig. 1 to 9. Where the terms "front", "rear", "upper", "lower", "top", "bottom", "inner", "outer", "transverse", etc., refer to an orientation or positional relationship based on that shown in the drawings, this is merely for convenience in describing the utility model and to simplify the description, and does not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the utility model.

The terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may include at least one, i.e. one or more, of the feature, either explicitly or implicitly. In the description of the present utility model, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise. When a feature "comprises or includes" a feature or some of its coverage, this indicates that other features are not excluded and may further include other features, unless expressly stated otherwise.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," "coupled," and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. Those of ordinary skill in the art will understand the specific meaning of the terms described above in the present utility model as the case may be.

In one aspect, the present utility model provides a guide bar for an indoor unit of an air conditioner. The indoor unit of the air conditioner is an indoor part of a split air conditioner or an indoor end machine type of a central air conditioner. Air conditioners are used to condition indoor air, including adjusting the temperature, humidity, air quality of the air, humidifying the indoor air, dehumidifying, introducing fresh air, and the like. The air conditioner may be constituted by an evaporator, a condenser, a compressor, a throttle device and other necessary elements to form a vapor compression refrigeration cycle system to output cool/hot air through a fan to achieve cooling and heating of an indoor environment. The air conditioning indoor unit may specifically be a wall-mounted air conditioning indoor unit, as shown in fig. 1 and 2, or may be a vertical air conditioning indoor unit.

Fig. 1 is a schematic view of an air conditioner indoor unit according to an embodiment of the present utility model; fig. 2 is an enlarged view of a cross-sectional view (not a cross-sectional view) of the air conditioning indoor unit shown in fig. 1. The direction of flow of the air stream is indicated by arrows in fig. 2.

The guide rod 30 of the embodiment of the utility model is used for being installed at the air supply port 11 of the casing 10 of the indoor unit of the air conditioner, and is used for allowing the air flow in the casing 10 to bypass the guide rod 30 and then be blown out of the casing 10.

In some embodiments, the deflector rod 30 functions to achieve a collective air delivery effect. As shown in fig. 1 and 2, an air duct 15 connected to the air supply port 11 is formed inside the casing 10, and the distance between two opposite air guiding walls 151 (in particular, ba sections thereof) and 152 (in particular, ed sections thereof) of the air duct 15 adjacent to the air supply port 11 is gradually reduced along the air flow direction to form a tapered section. In other words, the flow cross section of the duct 15 becomes gradually smaller in the air flow direction in the vicinity of the air supply port 11. The guide rod 30 is disposed in the air duct 15, and defines air outlet gaps 154 and 155 with the two air guiding walls 151 and 152, respectively, and is used for guiding the air flow blown to the air supply port 11 to the two air guiding walls 151 and 152, so that the air flow gradually flows out of the air supply port 11 toward the air flow center in a converging manner under the guidance of the air duct converging section.

Due to the addition of the guide rods 30, the flow cross section of the air outlet gaps 154 and 155 is necessarily smaller than that of the original air duct 15, so that the air flow speed is faster. Under the guidance of the tapering section of the air duct 15, the high-speed air flow gradually converges towards the air flow center direction in the outward flowing process, so as to form a converging effect, so that the wind power is very strong, the air supply distance is longer, the requirements of the wall-mounted air conditioner indoor unit on long-distance air supply and strong air supply are met, the air supply range is larger, the refrigerating/heating speed of the indoor space is more uniform, and the human body feel is more comfortable.

In other embodiments, the deflector rod 30 functions to achieve a split air supply effect. Specifically, the air guiding rod 30 is disposed at the outer side of the air supplying opening 11 (i.e. the air guiding rod 30 is adapted to move forward on the basis of fig. 2), so that after the air flow flowing out of the air supplying opening 11 is directed towards the air guiding rod 30, the air flows out of two sides of the air guiding rod 30 in the width direction respectively, so as to form two air supplying air flows, and a diversion effect is formed, so that the air flows are more dispersed and comfortable.

FIG. 3 is a schematic view of a deflector rod according to an embodiment of the present utility model; FIG. 4 is an exploded view of the deflector rod 30 of FIG. 3; FIG. 5 is a schematic view of the structure of FIG. 4 after the second shroud 200 has been flipped 180; FIG. 6 is an enlarged view at A of FIG. 5; fig. 7 is a cross-sectional view (not shown) of the deflector rod 30 of fig. 3.

As shown in fig. 3 to 7, the guide rod 30 in the embodiment of the present utility model is a hollow structure, which is formed by buckling a strip-shaped first cover plate 100 and a strip-shaped second cover plate 200 with each other, and the length directions of the two cover plates form the length direction of the guide rod 30, and the length direction is denoted as the x direction in the figure. The surfaces of the first and second cover plates 100 and 200 located inside the guide rods 30 are both inner side surfaces. The inner side surface of the first cover plate 100 is provided with a plurality of first clamping parts 110, the inner side surface of the second cover plate 200 is provided with a plurality of second clamping parts 210, and each first clamping part 110 is clamped with one second clamping part 210.

The guide rod 30 of the embodiment of the utility model is of a hollow structure, so that the cost of the guide rod 30 can be saved, the weight of the guide rod 30 can be reduced, and the middle collapse deformation of a longer guide rod can be reduced. In addition, the guide rod 30 in the embodiment of the utility model is formed by buckling the first cover plate 100 and the second cover plate 200, so that the processing is very convenient, and the first cover plate 100 and the second cover plate 200 are connected in a clamping manner, so that the assembly is more convenient and looseness can not occur.

In some embodiments, as shown in fig. 4, 5 and 7, the second cover plate 200 may be formed in an arc-shaped plate shape as a whole, and the first cover plate 100 may include an arc-shaped plate-shaped body plate 101 and two end plates 102 at both ends of the length direction of the body plate 101. The axis of the arc is parallel to the length of the deflector rod 30. Each of the end plates 102 is used to constitute both ends in the longitudinal direction of the deflector rod 30. In this way, the whole guide rod 30 forms a rod structure with an olive-shaped section, so as to be beneficial to playing the role of aggregation air supply or diversion air supply.

In some embodiments, referring to fig. 5, the plurality of first clamping portions 110 may be spaced apart at two edges of the first cover plate 100 in the width direction, i.e. two long edges f-edge and k-edge. The plurality of second catching portions 210 are spaced apart at both edges of the second cover plate 200 in the width direction, i.e., two long sides m and n. By such design, the connection between the long sides of the first cover plate 100 and the second cover plate 200 can be more tightly focused, so that serious flashing seams are avoided to influence the appearance. And, be convenient for the operator to observe when the assembly, be convenient for the alignment of first joint portion 110 and second joint portion 210.

In some embodiments, referring to fig. 6, each first clamping portion 110 may be an elastic claw, and each second clamping portion 210 has a clamping hole 211 for allowing the first clamping portion 110 to be clamped in, so as to achieve clamping. The first clamping portion 110 may be a plastic piece integrally formed with other portions of the first cover plate 100 so as to have elasticity and form an elastic claw.

Further, when each first engaging portion 110 is engaged into the engaging hole 211, the first engaging portion 110 is located on a side of the second engaging portion 210 away from the widthwise center of the second cover plate 200, so that it is convenient for an operator to observe to insert the first engaging portion 110 (elastic claw) into the engaging hole 211.

Fig. 8 is a schematic view showing an exploded state of the guide rods 30 of fig. 7 where the first cover plate 100 is connected to the second cover plate 200.

In some embodiments, referring to fig. 6 to 8, each edge of the first cover plate 100 in the width direction may be provided with a positioning bar 105 protruding toward the second cover plate 200. Each edge of the second cover plate 200 in the width direction has a positioning groove 205, and each positioning bar 105 is embedded in one positioning groove 205 to restrict the relative position of the second cover plate 200 and the first cover plate 100. Specifically, as shown in fig. 6, each of the positioning strips 105 may be extended along the edge in the width direction of the first cover plate 100. Each of the positioning grooves 205 is made in an elongated shape extending along the edge in the width direction of the second cover plate 200.

In the guide rod 30 of the embodiment of the utility model, the first cover plate 100 and the second cover plate 200 are positioned in the width direction by the positioning strips 105 and the positioning strips 105, so that after the assembly of the first cover plate 100 and the second cover plate 200 is completed, the joint of the outer surfaces of the first cover plate 100 and the second cover plate 200 can be aligned better, and the influence of dislocation on the appearance is avoided.

Further, as shown in fig. 8, the thickness of each of the positioning strips 105 may be gradually reduced from the root to the end to constitute a wedge-like structure to facilitate insertion of the positioning strips 105 into the positioning grooves 205.

In some embodiments, as shown in fig. 5, the inner side of the first cover plate 100 may be formed with at least one first reinforcing rib 120 extending in the length direction of the first cover plate 100 and at least one second reinforcing rib 130 extending in the width direction thereof, and the inner side of the second cover plate 200 may be formed with at least one third reinforcing rib 220 extending in the length direction of the second cover plate 200 and at least one fourth reinforcing rib 230 extending in the width direction thereof. By such design, the strength of the first cover plate 100 and the second cover plate 200 can be enhanced, and serious deformation such as bending, collapse and the like can be avoided after long-term use.

Specifically, the at least one second reinforcing rib 130 is a plurality in number, which are arranged at intervals along the length direction (x direction) of the first cover plate 100. The number of the at least one fourth reinforcing rib 230 is plural, which is arranged at intervals in the length direction x direction of the second cover plate 200). All the first and second reinforcing ribs 120 and 130 are crossed to be net-shaped, all the third and fourth reinforcing ribs 220 and 230 are crossed to be net-shaped, and the crossing points can be connected and fixed with each other to further improve the strength.

Fig. 9 is a schematic end structure of the first cover plate 100.

In some embodiments, as shown in fig. 9, the first cover plate 100 may further have a plurality of connection ribs 140, where each connection rib 140 is connected between the main body plate 101 and the end plate 102, so that the structure of the end plate 102 is more stable and the strength is higher, and thus the whole guide rod 30 is more stable when being mounted on the casing 10.

In some embodiments, as shown in fig. 6 and 9, at least one plugboard 202 extending towards the first cover plate 100 may be respectively provided at two ends of the second cover plate 200 in the length direction, at least one clamping groove 160 is provided on the inner side of each end plate 102, and after the first cover plate 100 is fastened to the second cover plate 200, each plugboard 202 is inserted into one clamping groove 160 to restrict the relative positions of the first cover plate 100 and the second cover plate 200, so as to achieve the limit and restriction of the first cover plate 100 and the second cover plate 200, and avoid the dislocation of the two in the length direction of the guide rod 30 to affect the appearance.

Specifically, as shown in fig. 9, at least one clamping plate 161 may be connected to the inner side of each end plate 102, and each clamping plate 161 and the inner side of the end plate 102 define a clamping groove 160. Each clamping plate 161 includes a first section 1611 extending normally from the inner side of the end plate 102 and a second section 1612 extending bent from the end of the first section 1611 and spaced from the inner side of the end plate 102, i.e., the clamping plate 161 is "L" -shaped, to define the clamping groove 160.

In some embodiments, referring to fig. 5, the number of the slots 160 of one end plate 102 may be one, and the number of the slots 160 of the other end plate 102 may be two, and accordingly, one plug board 202 may be provided at one end of the second cover plate 200 in the length direction, and two plug boards 202 may be provided at the other end. The three clip grooves 160 are located at three vertexes of an isosceles triangle, thus forming a triangle-shaped stabilizing structure, which makes the positioning of the first cover plate 100 and the second cover plate 200 more stable.

In another aspect, the utility model provides an air conditioner indoor unit.

The indoor unit of the air conditioner is an indoor part of a split air conditioner or an indoor end machine type of a central air conditioner. Air conditioners are used to condition indoor air, including adjusting the temperature, humidity, air quality of the air, humidifying the indoor air, dehumidifying, introducing fresh air, and the like. The air conditioner may be constituted by an evaporator, a condenser, a compressor, a throttle device and other necessary elements to form a vapor compression refrigeration cycle system to output cool/hot air through a fan to achieve cooling and heating of an indoor environment. The air conditioning indoor unit may specifically be a wall-mounted air conditioning indoor unit, as shown in fig. 1 and 2, or may be a vertical air conditioning indoor unit.

The indoor unit of an air conditioner according to an embodiment of the present utility model includes a casing 10 and at least one guide bar 30 as described in any of the above embodiments, which is disposed at the air supply port 11, so that the air flow in the casing 10 bypasses the guide bar 30 and is blown out of the casing 10.

In some embodiments, as shown in fig. 1 and 2, an air duct 15 connected to the air supply port 11 is formed inside the casing 10, and the distance between two opposite air guiding walls 151 (in particular, ba segments thereof) and 152 (in particular, ed segments thereof) of the air duct 15 adjacent to the air supply port 11 is gradually reduced along the air flow direction, so as to form a tapered section. In other words, the flow cross section of the duct 15 becomes gradually smaller in the air flow direction in the vicinity of the air supply port 11. The guide rod 30 is disposed in the air duct 15, and defines air outlet gaps 154 and 155 with the two air guiding walls 151 and 152, respectively, and is used for guiding the air flow blown to the air supply port 11 to the two air guiding walls 151 and 152, so that the air flow gradually flows out of the air supply port 11 toward the air flow center in a converging manner under the guidance of the air duct converging section.

In some embodiments, as shown in fig. 2, for the wall-mounted air conditioner indoor unit, the bottom wall of the casing 10 is provided with a lower air supply port 12 which is opened downward and is connected with an air duct 15. In this way, air can be blown from the lower air blowing port 12 to the right lower side of the air conditioning indoor unit. Downward air supply is more favorable for accelerating the temperature rising speed of the lower space of the house in the heating mode, so that a human body can feel the heating effect more quickly. An air deflector 60 may be provided at the lower air supply opening 12. The air deflector 60 is rotatably installed to the cabinet 10 for opening or closing the lower air supply port 12 and guiding the air supply direction of the lower air supply port 12.

As shown in fig. 2, the wall-mounted air conditioner indoor unit may be an indoor unit of an air conditioner that performs cooling/heating by a vapor compression refrigeration cycle system, and further includes a heat exchanger 40 and a fan 50. The heat exchanger 40 is disposed in the housing 10, and is configured to exchange heat with an air flow flowing therethrough to form a heat exchange air flow, i.e., cold air or hot air, which may be a three-stage fin heat exchanger. The fan 50 is disposed in the casing 10, and is used for driving indoor air to enter the casing 10 through the air inlet 13 at the top of the casing 10, so that the indoor air exchanges heat with the heat exchanger 40 to become heat exchange air flow, and then driving the heat exchange air flow to the air supply port 11 and the lower air supply port 12 through the air duct 15, and finally blowing the indoor air from the air supply port 11 and/or the lower air supply port 12.

By now it should be appreciated by those skilled in the art that while a number of exemplary embodiments of the utility model have been shown and described herein in detail, many other variations or modifications of the utility model consistent with the principles of the utility model may be directly ascertained or inferred from the present disclosure without departing from the spirit and scope of the utility model. Accordingly, the scope of the present utility model should be understood and deemed to cover all such other variations or modifications.

Claims (10)

1. A guide rod for an air conditioner indoor unit, which is arranged at an air supply port of a shell of the air conditioner indoor unit and used for allowing air flow in the shell to bypass the guide rod and blow out to the outside of the shell,

the guide rod is of a hollow structure and is formed by mutually covering and clamping a strip-shaped first cover plate and a strip-shaped second cover plate; and is also provided with

The inner side surface of the first cover plate is provided with a plurality of first clamping parts, the inner side surface of the second cover plate is provided with a plurality of second clamping parts, and each first clamping part is clamped with one second clamping part.

2. The diverter stem of claim 1, wherein the diverter stem comprises a valve,

the plurality of first clamping parts are distributed at intervals at two edges of the first cover plate in the width direction; and is also provided with

The second clamping portions are distributed at two edges of the second cover plate in the width direction at intervals.

3. The diverter stem of claim 1, wherein the diverter stem comprises a valve,

each first clamping part is an elastic claw, and each second clamping part is provided with a clamping hole allowing the first clamping part to be clamped in.

4. The guide rod according to claim 3, wherein,

when each first clamping part is clamped into the clamping hole, the first clamping part is positioned at one side of the second clamping part, which is far away from the center of the second cover plate in the width direction.

5. The diverter stem of claim 1, wherein the diverter stem comprises a valve,

each edge of the first cover plate in the width direction has a positioning strip protruding toward the second cover plate; and is also provided with

Each edge of the second cover plate in the width direction is provided with a positioning groove, and each positioning strip is embedded into one positioning groove so as to restrict the relative position of the second cover plate and the first cover plate.

6. The diverter stem of claim 5,

each of the positioning strips extends along an edge in the width direction of the first cover plate; and is also provided with

Each of the positioning grooves is elongated extending along an edge in the width direction of the second cover plate.

7. The diverter stem of claim 6, wherein the diverter stem comprises a valve,

each of the locating strips gradually decreases in thickness from the root to the end.

8. The diverter stem of claim 1, wherein the diverter stem comprises a valve,

the first cover plate comprises an arc-shaped plate-shaped main body plate and two end plates positioned at two ends of the main body plate in the length direction, and each end plate is used for forming two ends of the guide rod in the length direction; and is also provided with

The second cover plate is in an arc plate shape as a whole.

9. An indoor unit of an air conditioner, comprising:

a shell provided with an air supply port; and

at least one deflector rod according to any one of claims 1 to 8, which is provided at the air supply port so that the air flow in the casing is blown out of the casing after bypassing the deflector rod.

10. The indoor unit of claim 9, wherein the indoor unit of the air conditioner,

an air duct connected with the air supply port is formed in the casing, and the distance between two opposite air guide walls of the air duct adjacent to the air supply port is gradually reduced along the air flow direction to form a tapered section;

the air guide rods are arranged in the air duct, and respectively define air outlet gaps with the two air guide walls, and are used for guiding the air flow blown to the air supply opening to the two air guide walls, so that the air flow gradually flows out of the air supply opening towards the air flow center in a polymerization manner under the guidance of the air duct converging section.