CN111219793A

CN111219793A - Indoor unit of air conditioner

Info

Publication number: CN111219793A
Application number: CN201811418334.5A
Authority: CN
Inventors: 渡边诚; 王巧智; 魏晋; 吴大伟; 杨震清
Original assignee: Toshiba Carrier Air Conditioning China Co Ltd; Toshiba Carrier Corp
Current assignee: Toshiba Carrier Air Conditioning China Co Ltd; Toshiba Carrier Corp
Priority date: 2018-11-26
Filing date: 2018-11-26
Publication date: 2020-06-02

Abstract

The invention relates to an air-conditioning indoor unit, comprising: a frame body provided with an air inlet (4) and an air outlet (5); a heat exchanger (3) disposed in the housing and configured to exchange heat with air flowing through the heat exchanger; and a blower (2) that is disposed adjacent to the heat exchanger, that draws in indoor air from the air intake opening, and that blows out the drawn-in air from the air outlet opening into the room through the heat exchanger, the air conditioning indoor unit further including: and a wind direction plate (6) which is formed into a honeycomb plate shape formed by arranging a plurality of ventilation pipes and is arranged at the upwind side of the heat exchanger, wherein air blown by the blower passes through the plurality of ventilation pipes and is blown into the heat exchanger at the position where the wind direction plate is arranged. The air conditioner indoor unit can guide the flow direction of the oblique air flow, and the air flow direction is parallel to the fins of the heat exchanger, so that abnormal air supply noise is eliminated.

Description

Indoor unit of air conditioner

Technical Field

The invention relates to an indoor unit of an air conditioner.

Background

In a duct type air conditioning indoor unit equipped with a cooling fan, a fan cover needs to be attached to the outside of the cooling fan in order to guide the air flow. The indoor air is sucked in from the suction port of the fan cover and blown out from the blow-out port of the fan cover. Heat exchange is performed by a fin-tube type heat exchanger of the indoor unit. To save space, a fin-tube type heat exchanger is constructed of a plurality of heat exchanger components.

Disclosure of Invention

Problems to be solved by the invention

The inventor of the application finds that: the airflow blown out from the air outlet of the fan cover enters a relatively large air flow passage space, and the width of the heat exchanger tends to be larger than the areas corresponding to both ends of the air outlet, which causes the airflow blown out from the air outlet of the fan cover to be dispersed and inclined, and finally to come into contact with the fins of the heat exchanger, thereby generating abnormal air flow noise.

The invention aims to provide an air conditioner indoor unit capable of eliminating abnormal air supply noise.

Means for solving the problems

The invention relates to an air-conditioning indoor unit, comprising: a frame body provided with an air suction port and an air blowing port; a heat exchanger disposed in the housing and configured to exchange heat with air flowing through the heat exchanger; and a blower disposed adjacent to the heat exchanger, configured to suck indoor air from the air suction port, and blow the sucked air through the heat exchanger and into the room from the air blow port, the air conditioning indoor unit further including: and a wind direction plate formed in a honeycomb plate shape in which a plurality of ventilation ducts are arranged, the wind direction plate being attached to an upstream side of the heat exchanger, and air blown by the blower is blown into the heat exchanger through the plurality of ventilation ducts.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, the flow direction of the oblique airflow, particularly the airflow that goes beyond the heat exchanger portion corresponding to both ends of the outlet port of the fan cover, can be guided so that the airflow direction is parallel to the fins of the heat exchanger, thereby eliminating abnormal air-feeding noise.

Drawings

Fig. 1 is a perspective view of an air conditioning indoor unit according to the present invention with an upper panel removed.

Fig. 2 is a sectional view showing an outlet of a blower of an indoor unit of an air conditioner according to the present invention.

Fig. 3 is a schematic side view of the air conditioning indoor unit of the present invention with side panels removed.

Fig. 4 is a perspective view of a heat exchanger of an air conditioning indoor unit according to the present invention.

Fig. 5 is a partially enlarged view of fig. 4.

Fig. 6 is a side sectional view showing a method of fixing the wind direction plate and the heat exchanger according to the present invention.

Fig. 7 is a front view showing a fixing member of the wind vane of the present invention.

FIG. 8 is a graph showing the frequency noise relationship for different diameters for prior art and inventive vents.

Fig. 9 is a graph showing the relationship between the frequency noise of the wind direction plate of the prior art and the wind direction plate of the present invention at different widths.

FIG. 10 is a graph showing the frequency noise relationship at different heights for the prior art and the present invention windvane.

Detailed Description

Hereinafter, a specific embodiment of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view of an air conditioning indoor unit according to the present invention with an upper panel removed. As shown in fig. 1, the air conditioning indoor unit of the present embodiment includes a rectangular parallelepiped housing 1. Heat exchangers 3 and fans 2 are disposed in front and rear of the housing 1.

Fig. 3 is a schematic side view of the air conditioning indoor unit of the present invention with side panels removed. As shown in fig. 3, an air inlet 4 is provided on the lower surface of the housing 1, the air inlet 4 may be provided on the rear side by switching the damper to suck air, and an air outlet 5 is provided on the front surface of the housing 1.

As shown in fig. 3, the heat exchanger 3 is composed of three heat exchanger members having the same configuration, and is arranged in a zigzag shape so as to be close to the front surface (front surface) of the housing 1. In fig. 3, the heat exchanger element 3A is located above, the heat exchanger element 3B is located in the middle, and the heat exchanger element 3C is located below. The heat exchanger 3 (i.e., the heat exchanger components 3A to 3C) is a fin-tube type heat exchanger, and includes a plurality of aluminum fins and a plurality of heat transfer tubes. A plurality of aluminum fins are arranged side by side with a predetermined gap therebetween, a plurality of heat transfer tubes are inserted through the aluminum fins, and a heat exchange medium (refrigerant) flows through the tubes. The air flows through the gaps between the fins and exchanges heat with the fins and the heat transfer tubes.

As shown in fig. 1, a blower 2 is disposed behind a heat exchanger 3 in a housing 1, and the blower 2 is composed of two

identical blower members

2A and 2B disposed side by side in the left-right direction. The blower unit 2A includes a motor 20, a fan 21A, and a fan cover 22A. Similarly, the blower unit 2B includes a motor 20, a fan 21B, and a fan cover 22B. The blower part 2A and the blower part 2B share one motor 20. The motor 20 is mounted on the motor base 8.

The fans 21A and 21B are housed in the fan covers 22A and 22B, respectively.

Suction ports

23A and 23B for sucking air are provided on both sides of the fan cover 22A, respectively, and a blow-out port 24A for blowing air to the heat exchanger 3 is also provided. Similarly,

suction ports

23C and 23D for sucking air are provided on both sides of the fan cover 22B, and a discharge port 24B for discharging air to the heat exchanger 3 is provided.

A partition plate 9 is disposed between the heat exchanger 3 and the blower 2, two rectangular windows (see fig. 2) are provided in the partition plate 9 at positions corresponding to the

air outlets

24A, 24B, respectively, and the air blown out from the

air outlets

24A, 24B passes through the rectangular windows and is blown into an air flow passage space S (see fig. 3) between the heat exchanger 3 and the partition plate 9.

As the motor 20 rotates the fans 21A and 21B, the blower 2 sucks in indoor air from the air suction port 4, sucks in the sucked air from the

suction ports

23A, 23B, 23C, and 23D of the fan covers 22A and 22B, blows out the sucked air from the blow-out

ports

24A and 24B, enters the air flow passage space S through the rectangular windows of the partition plate 9, and blows out the air to the heat exchanger 3.

As shown in fig. 3 to 5, the wind direction plate 6 is attached to the windward side of the heat exchanger member 3B by fixing

fasteners

7A, 7B, 7C, 7D, and 7E. As shown in fig. 7, the fixing buckle 7 has a shape in which both side arms of the fixing buckle 7 have a constant tension and can be engaged with the heat transfer pipe of the heat exchange member 3B by elastic deformation.

The wind direction plate 6 is formed by connecting a plurality of ventilation ducts, and the plurality of ventilation ducts are arranged in a honeycomb plate shape, and the wind direction plate 6 of the present embodiment is a resin member. Where the wind direction plate 6 is provided, the air blown from the blower 2 passes through the plurality of ventilation ducts of the wind direction plate 6, is blown into the heat exchanger member 3B, and flows through the gaps between the fins. The air is heat-exchanged in the heat exchanger and then blown into the room from the air outlet 5 of the housing 1.

In the present embodiment, the inside diameter of the draft tube is preferably equal to or less than 12mm, more preferably equal to or less than 10mm, and in the present embodiment, the draft tube is cylindrical with an inside diameter of 10mm and a height of 10 mm. The cross section of the ventilation pipe can be circular, and can also be other shapes such as a polygon. When the cross-sectional shape of the vent pipe is polygonal, the inner diameter of the vent pipe refers to the diameter of an inscribed circle of the cross-section of the vent pipe.

In the present embodiment, the size of the louver 6 is 870mm by 40mm by 10 mm. Here, the size of the wind direction plate 6 is designed according to the size of the heat exchanger member 3B, and is not limited to the present embodiment.

The wind direction plate 6 preferably covers 75% or more of the width of the heat exchanger element 3B, more preferably 90% or more of the width of the heat exchanger element 3B, and further preferably covers the entire heat exchanger element 3B in the width direction. The width of the heat exchanger component 3B refers to the length of the heat exchanger component 3B in the direction in which the heat transfer tubes extend.

The wind direction plate 6 preferably covers 50% or more of the height of the heat exchanger element 3B, and more preferably covers the entire heat exchanger element 3B in the height direction. The height of the heat exchanger element 3B means the length of the heat exchanger element 3B in the up-down direction in fig. 6. In the present invention, the heat exchanger member 3B to which the wind direction plate 6 is attached is vertically disposed, and when the heat exchanger member to which the wind direction plate is attached is obliquely disposed, the height direction of the heat exchanger member is parallel to the plane in which the outlet of the fan cover is located.

The thickness of the wind direction plate 6 is preferably 8mm or more, and the thickness of the wind direction plate 6 is more preferably 10mm or more. The thickness of the wind direction plate 6 is the length of the wind direction plate 6 in the front-rear direction in fig. 6, and is also the length of the ventilation duct.

The principle and effect of the embodiment of the present invention for eliminating abnormal blowing noise will be described below.

As shown in fig. 2 and 3, the air flow passage space S has a rectangular cross section parallel to the partition plate 9 and has an area larger than the areas of the

air outlets

24A and 24B. The air is blown out from the

air outlets

24A, 24B having relatively small areas, and when the air enters the relatively large air flow passage space S, the air flow path also becomes wide.

In the prior art, the wind direction plate 6 according to the embodiment of the present invention is not provided, and due to the difference in area between the cross section of the air flow passage space S and the

air outlets

24A and 24B, especially when both ends of the heat exchanger are far beyond both ends of the air outlets of the fan, the air is blown out from the

air outlets

24A and 24B, then inclines, and finally comes into contact with the fins of the heat exchanger member 3B, thereby generating abnormal air flow noise. According to the data measured in the full-muffling laboratory, under the condition that air is in contact with the fins of the heat exchanger component 3B, the air supply noise in the frequency range of 2KHz to 5KHz is significant, and the frequency range is the most sensitive frequency range of human ears, so that the life quality of a user is affected.

In the embodiment of the present invention, the wind direction plate 6 is attached to the upstream side of the heat exchanger member 3B provided opposite to the

air outlets

24A, 24B, and the axial directions of the plurality of ducts of the wind direction plate 6 are parallel to the direction of the plane in which the plurality of fins are located. The flow direction of the air is guided by the plurality of ventilation ducts of the wind direction plate 6 so that the flow direction of the air blown into the heat exchanger part 3B through the plurality of ventilation ducts is parallel to the fins of the heat exchanger part 3B, thereby eliminating abnormal blowing noise.

Fig. 8 to 10 are graphs showing a comparison between the frequency noise relationship between the conventional art and the embodiment of the present invention.

FIG. 8 is a graph showing the frequency noise relationship for different diameters for prior art and inventive vents. As shown in fig. 8, in the frequency range of 2KHz to 5KHz to which the human ear is most sensitive, a significant effect of eliminating abnormal air supply noise has been obtained in the case of using the wind vane 6 having the ventilation duct with an inner diameter of phi 12mm, and the effect of eliminating abnormal air supply noise is more significant in the case of using the wind vane 6 having the ventilation duct with an inner diameter of phi 10 mm.

Fig. 9 is a graph showing the relationship between the frequency noise of the wind direction plate of the prior art and the wind direction plate of the present invention at different widths. As shown in fig. 9, in the frequency range of 2KHz to 5KHz to which the human ear is most sensitive, in the case where the wind direction plate 6 covers 75% of the width of the heat exchanger element 3B, a significant effect of eliminating abnormal air supply noise is obtained, in the case where the wind direction plate 6 covers 90% of the width of the heat exchanger element 3B, the effect of eliminating abnormal air supply noise is more significant, and in the case where the wind direction plate 6 covers the heat exchanger element 3B entirely in the width direction, the effect of eliminating abnormal air supply noise is the best.

FIG. 10 is a graph showing the frequency noise relationship at different heights for the prior art and the present invention windvane. As shown in fig. 10, in the frequency range of 2KHz to 5KHz to which the human ear is most sensitive, in the case where the wind direction plate 6 covers 50% of the height of the heat exchanger element 3B, a significant effect of eliminating abnormal air supply noise is obtained, and in the case where the wind direction plate 6 covers the heat exchanger element 3B entirely in the height direction, the effect of eliminating abnormal air supply noise is more significant.

The present embodiment is described by taking as an example a case where the heat exchanger 3 is formed of three heat exchanger members and arranged in a zigzag shape, and aims to arrange the heat exchanger members as many as possible in a limited space of a casing of an air conditioning indoor unit. However, the configuration of the heat exchanger 3 is not limited to the embodiment of the present invention, and for example, the heat exchanger may be configured by two heat exchanger members and arranged in a V-shape.

In the present embodiment, the wind direction plate 6 is attached to the windward side of the heat exchanger member 3B provided opposite to the

air outlets

24A and 24B, thereby obtaining the best noise reduction effect. However, the wind direction plate may be attached to another heat exchanger component when the noise reduction effect can be obtained.

In the present embodiment, the wind direction plate 6 is attached to the windward side of the heat exchanger member 3B by fixing

fasteners

7A, 7B, 7C, 7D, and 7E. However, other attachment methods may be adopted, and for example, the wind direction plate 6 may be attached to the windward side of the heat exchanger member 3B.

It is apparent that a person having ordinary knowledge in the art can carry out various modifications and combinations within the technical idea of the present invention.

Claims

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

a frame body provided with an air suction port and an air blowing port;

a heat exchanger disposed in the housing and configured to exchange heat with air flowing through the heat exchanger; and

a blower disposed adjacent to the heat exchanger, sucking indoor air from the air suction port, passing the sucked air through the heat exchanger, and blowing the sucked air from the air blowing port into the room,

the indoor unit of an air conditioner is characterized by further comprising:

and a wind direction plate formed in a honeycomb plate shape in which a plurality of ventilation ducts are arranged, the wind direction plate being attached to an upstream side of the heat exchanger, wherein air blown by the blower is blown into the heat exchanger through the plurality of ventilation ducts at a position where the wind direction plate is attached.

2. An indoor unit of an air conditioner according to claim 1,

the heat exchanger is constructed from a plurality of heat exchanger components,

the blower has a fan and a fan cover covering the outside of the fan, the fan cover is provided with a suction port and a blowing port,

the wind direction plate is attached to an upwind side of the heat exchanger member facing the outlet of the fan cover.

3. An indoor unit of an air conditioner according to claim 1,

the heat exchanger is a fin-tube type heat exchanger and comprises a plurality of fins and a plurality of heat transfer tubes,

the plurality of fins are arranged side by side with a predetermined gap therebetween, the plurality of heat transfer tubes are inserted into the plurality of fins, a heat exchange medium flows through the plurality of heat transfer tubes, and air flows through the gaps of the plurality of fins to exchange heat with the plurality of fins and the plurality of heat transfer tubes,

the axial directions of the ventilation pipes are parallel to the direction of the plane of the fins.

4. An indoor unit of an air conditioner according to any one of claims 1 to 3,

the diameter of an inscribed circle of the cross section of the vent pipe is less than 12 mm.

5. The indoor unit of an air conditioner according to claim 4,

the cross section of the ventilation pipe is circular.

6. The indoor unit of an air conditioner according to claim 4,

the cross section of the ventilation pipe is polygonal.

7. An indoor unit of an air conditioner according to any one of claims 1 to 3,

the wind direction plate covers more than 75% of the width of the heat exchanger.

8. An indoor unit of an air conditioner according to any one of claims 1 to 3,

the wind direction plate covers more than 50% of the height of the heat exchanger.

9. An indoor unit of an air conditioner according to any one of claims 1 to 3,

the thickness of the wind plate is more than 8 mm.