JP2020085310A - Heat exchanger and air conditioner - Google Patents

Abstract

To provide a heat exchanger capable of reducing a size in a depth direction in a case of being housed in an air conditioner.SOLUTION: A heat exchanger comprises a plurality of fins provided with intervals, and a plurality of heat transfer tubes provided orthogonally to the plurality of fins. The plurality of fins are provided with a plurality of convex corner parts and a plurality of concave corner parts at both ends in a longitudinal direction. The plurality of heat transfer tubes are arranged in a zigzag manner in a plurality of stages in the longitudinal direction of the fins and in a plurality of rows in a lateral direction. A distance connecting the centers of adjacent heat transfer tubes can be made evenly.SELECTED DRAWING: Figure 6

Description

Embodiments of the present invention relate to a heat exchanger and an air conditioner.

In a conventional air conditioner, a heat exchanger having a Z shape as a whole by combining a plurality of heat exchangers is used.

International Publication No. 2015/097821

However, the Z-shaped heat exchanger can reduce the size of the air conditioner main body in the depth direction as compared with the straight-shaped heat exchanger, but in order to obtain the required performance with a limited housing size, If the front area of the exchanger needs to be large and the height dimension is limited, the depth dimension cannot be reduced.

The embodiment of the present invention has been made in consideration of such circumstances, and an object thereof is to provide a heat exchanger capable of reducing the dimension in the depth direction when housed in an air conditioner.

A heat exchanger according to an embodiment of the present invention includes a plurality of fins provided with a gap, and a plurality of heat transfer tubes provided orthogonal to the plurality of fins,
The plurality of fins are provided with a plurality of convex corner portions and a plurality of concave corner portions at both ends in the longitudinal direction, and the plurality of heat transfer tubes are staggered in a plurality of rows in the longitudinal direction of the fin and in a plurality of rows in the lateral direction. And the distances connecting the centers of the adjacent heat transfer tubes are equal to each other.

The perspective view which shows the indoor unit of the air conditioning apparatus of 1st Embodiment. Sectional drawing which shows the indoor unit of the air conditioning apparatus of 1st Embodiment. Sectional drawing which shows the indoor unit at the time of cooling operation of 1st Embodiment. Sectional drawing which shows the indoor unit at the time of heating operation of 1st Embodiment. Sectional drawing which shows the airflow in the room of 1st Embodiment. The figure which shows the heat exchanger of 1st Embodiment. The figure which shows the heat exchanger of 1st Embodiment, and a comparative example.

Hereinafter, the present embodiment will be described with reference to the accompanying drawings. First, the indoor unit of the air conditioner of the first embodiment will be described with reference to FIGS. 1 to 6. Hereinafter, the left side of the paper surface of FIGS. 2 to 6 will be referred to as the front side (front side), and the right side of the paper surface will be referred to as the back side (rear side). Reference numeral 1 in FIG. 1 is an indoor unit of an air conditioner that adjusts the temperature of the indoor air. As shown in FIG. 5, the indoor unit 1 is arranged in a corner of the room where the ceiling T and the wall K meet. The air conditioner A is configured by connecting the indoor unit 1 and the outdoor unit B provided outside the room through a connection pipe P.

In this embodiment, the ceiling-suspended indoor unit 1 that is suspended on the ceiling T is illustrated. The indoor unit 1 may be a ceiling-embedded type that is embedded in the ceiling T, a wall-mounted type that is attached to a high place in the room, or a floor-standing type that is installed on the floor.

As shown in FIGS. 1 and 2, the indoor unit 1 includes a horizontally long box-shaped housing 2. The housing 2 is an element that forms the outer shell of the indoor unit 1, and includes an upper surface portion 2a, a lower surface portion 2b, a rear surface portion 2c, and a side surface portion 2d. The upper surface portion 2a is inclined downward from the rear side of the housing 2 toward the front side. The lower surface portion 2b is inclined upward from the rear side of the housing 2 toward the front side. That is, the housing 2 is formed such that the height of the housing becomes smaller from the rear side toward the front side.

As shown in FIG. 2, a first ventilation port 5 is provided on the front side of the housing 2 so as to open in the front direction (first direction; horizontal direction). The lower surface of the rear side of the housing 2 is provided with a second ventilation port 6 that opens downward (second direction). The second ventilation port 6 is provided below the first ventilation port 5 and is opened in a direction different from the opening direction of the first ventilation port 5.

The first ventilation port 5 is composed of a main ventilation port 5a (hereinafter referred to as the first main ventilation port 5a) and an auxiliary ventilation port 5b (hereinafter referred to as the first auxiliary ventilation port 5b). The second ventilation port 6 is composed of a main ventilation port 6a (hereinafter referred to as the second main ventilation port 6a) and an auxiliary ventilation port 6b (hereinafter referred to as the second auxiliary ventilation port 6b).

A ventilation passage 7 is formed inside the housing 2 from the first ventilation port 5 to the second ventilation port 6. The ventilation passage 7 is formed by the inner wall portion 3 and the guide portion 4. The air passage 7 is provided with a heat exchanger 8, a first fan 9 arranged on the front side and a second fan 10 arranged on the rear side so as to sandwich the heat exchanger 8.

The inner wall 3 is provided from the upper front side to the lower rear side inside the housing 2, and has a first recess 3a on the front side, a second recess 3b in the middle, and a third recess 3c on the rear side. There is. The first fan 9 is arranged in the first concave portion 3a, the heat exchanger 8 is arranged in the second concave portion 3b, and the second fan 10 is arranged in the third concave portion 3c.

The guide part 4 is provided from the lower part on the front side to the lower part on the rear side inside the housing 2, and the first guide part 4a, the second guide part 4b corresponding to the first fan 9, and the second fan 10 are provided on the front side. It has a corresponding third guide portion 4c. The first guide portion 4a partitions the first main ventilation port 5a and the first auxiliary ventilation port 5b and guides the air blown by the first fan 9 to the first main ventilation port 5a.

Inside the housing 2, below the heat exchanger 8, a drain pan 20 for receiving water droplets separated from air by the heat exchanger 8 is provided. The drain pan 20 is located between the second guide portion 4b and the third guide portion 4c, and forms a part of the ventilation passage 7 together with the guide portion 4.

The heat exchanger 8 is composed of a plurality of fins 81 provided with a gap and a plurality of heat transfer tubes 82 provided orthogonal to the plurality of fins 81. The heat exchanger 8 is arranged in the housing 2 such that the upper side is inclined toward the rear side of the housing 2.
The heat exchanger 8 exchanges heat between the air passing between the fins 81 and the refrigerant when flowing through the heat transfer tube 82. The heat exchanger 8 functions as an evaporator during the cooling operation and reduces the temperature of the surrounding air. Further, the heat exchanger 8 functions as a condenser during the heating operation and raises the temperature of the surrounding air.

The first fan 9 and the second fan 10 are cross flow fans. The first fan 9 is rotated counterclockwise by the first fan motor 91. The second fan 10 is rotated clockwise by the second fan motor 101. Further, the first fan motor 91 and the second fan motor 101 can have different rotation speeds, so that the rotation speeds of the first fan 91 and the second fan 101 can be different from each other. Further, the first fan motor 91 and the second fan motor 101 can drive either one and stop the other.

In the first ventilation port 5, the first main ventilation port 5a has a first horizontal louver 11 and a first vertical louver 13, and a first horizontal louver motor and a first vertical louver motor (both not shown) for adjusting the respective angles. Is provided. A first opening/closing plate 15 and a first opening/closing plate motor (not shown) for opening/closing the first opening/closing plate 15 are provided in the first auxiliary ventilation port 5b.

In the second ventilation port 6, the second main ventilation port 6a has a second horizontal louver 12 and a second vertical louver 14, and a second horizontal louver motor and a second vertical louver motor (both not shown) for adjusting the respective angles. Is provided. A second opening/closing plate 16 and a second opening/closing plate motor (not shown) for opening/closing the second opening/closing plate 16 are provided at the second auxiliary ventilation port 6b.

The first horizontal louver 11 and the second horizontal louver 12 are plate members having substantially the same size as the openings of the first main ventilation port 5a and the second main ventilation port 6a. The first horizontal louver and the second horizontal louver have the same shape, and the second horizontal louver 12 is attached to the second main ventilation port 6a with its left and right sides reversed with respect to the first horizontal louver.

The first opening/closing plate 15 and the second opening/closing plate 16 are plate members having substantially the same size as the openings of the first auxiliary ventilation port 5b and the second auxiliary ventilation port 6b. The first opening/closing plate 15 and the second opening/closing plate 16 have the same shape.

The first vertical louvers 13 and the second vertical louvers 14 are fan-shaped plate portions, and are provided in parallel in the width direction of the housing 2. The first vertical louver 13 and the second vertical louver 14 have the same shape, and the second vertical louver 14 is attached to the second main ventilation port 6a with the right and left reversed with respect to the first vertical louver 13. ..

As shown in FIG. 2, a filter section 21 is provided below the drain pan 20. The filter unit 21 includes an air filter 22 and a filter driving unit 23 that slides the air filter 22 back and forth. The air filter 22 is flexible and is provided with a rack 23 that constitutes a part of the filter driving unit 23. The filter drive unit 23 includes a pinion 24 housed in a lower portion on the front side of the drain pan 20 and a motor (not shown) that rotates the pinion 24. By rotating the pinion 24 of the filter driving unit 23, the air filter 22 provided with the latch 23 can be moved back and forth. A filter guide portion 25 that guides the air filter 22 is provided inside the housing 2.

The filter portion 21 moves the rear end portion 22B of the air filter 22 to a position where it abuts against the third recess 3c of the inner wall portion 3 to remove dust of the air sucked from the second ventilation port 6 (first filter position). (See FIG. 3) and a second filter position for removing the dust of the air sucked from the first ventilation port 5 by moving the front end 22F of the air filter 22 to a position where it abuts against the first recess 3a of the inner wall portion 3. The air filter 22 can be arranged at two positions (see FIG. 4).

Further, when the air filter 22 moves from the first filter position to the second filter position, the air filter 22 passes between the first guide portion 4a and the second guide portion 4b. This portion is provided with a backflow prevention plate 26 that prevents a part of the air directed to the first main air outlet 5a from flowing toward the first auxiliary air outlet 5b during the first air blow described later. The backflow prevention plate 26 is rotatably attached to the second guide portion 4b. The backflow prevention plate 26 blocks the space between the first guide portion 4a and the second guide portion 4b when the air filter 22 is in the first filter position, and the first guide portion when the air filter 22 is in the second filter position. 4a and the 2nd guide part 4b are comprised so that it may open.

In the present embodiment, the air filter 22 is arranged at the first filter position when the air conditioner A performs the first blow (mainly the cooling operation). On the other hand, when the air conditioner A performs the second air blowing (mainly the heating operation), the second air filter 30 is arranged in the second arrangement portion 32. By doing so, dust can be removed regardless of the direction in which air passes through the heat exchanger 8.

As shown in FIG. 2, a controller 31 is provided in the space on the rear side of the housing 2.
The controller 31 communicates with the outdoor unit B, a remote controller (not shown), etc., and controls the indoor unit 1 according to commands from the remote controller and inputs from various sensors.

As shown in FIG. 3, during the cooling operation, the indoor unit 1 of the present embodiment opens both the second horizontal louver 12 and the second opening/closing plate 16 to suck in the air C from the second ventilation port 6, and The first horizontal louver 11 is opened to perform the first air blowing (cooling air blowing) that blows out the air C from the first main ventilation port 5a. At this time, the first horizontal louver 11 adjusts the vertical airflow direction, and the first vertical louver 13 adjusts the horizontal airflow direction. The filter unit 21 also arranges the air filter 22 at the first filter position. Then, as shown in FIG. 5, in the first ventilation mode, the air C blown out from the main first ventilation port 5a flows along the ceiling T and also descends along the wall K facing the indoor unit 1. Then, the air C flows along the floor surface U, rises along the wall K provided with the indoor unit 1, and is sucked in through the second ventilation port 6.

As shown in FIG. 4, in the indoor unit 1 of the present embodiment, during the heating operation, both the first horizontal louver 11 and the first opening/closing plate 15 are opened to suck the air H from the first ventilation port 5, and The horizontal louver 12 is opened to perform the second air blowing (heating air blowing) in which the air H is blown out from the second main ventilation port 6a. At this time, the second horizontal louver 12 adjusts the vertical airflow direction, and the second vertical louver 14 adjusts the horizontal airflow direction. The filter unit 21 also arranges the air filter 22 at the second filter position. Then, as shown in FIG. 5, in the second blowing mode, the air H blown out from the main second ventilation port 6 descends along the wall K and flows along the floor surface U. Then, the air H rises along the wall K facing the indoor unit 1, flows along the ceiling T, and is sucked from the first ventilation port 5.

When performing the first blowing, the first fan 9 is rotated at high speed and the second fan 10 is rotated at low speed. When performing the second blowing, the second fan 10 is rotated at high speed and the first fan 9 is rotated at low speed. That is, the first blower 9 and the second blower 10 can be switched between the first blower and the second blower by making the rotation speeds of the first fan 9 and the second fan 10 different from each other. That is, the flow of air passing through the heat exchanger 8 can be reversed. The mode in which the rotation speeds of the first fan 9 and the second fan 10 are different includes a mode in which the rotation of either the first fan 9 or the second fan 10 is stopped.

With the above configuration, the indoor unit 1 of the present embodiment is capable of two ventilation modes, that is, the first ventilation mode and the second ventilation mode, and the air ejection port is the first ventilation port 5 or the second ventilation port. Since the wind direction can be adjusted with any of the mouths 6, the airflow C suitable for the cooling operation or the airflow H suitable for the heating operation can be generated in the indoor space N.
Further, regardless of whether the air intake port is the first ventilation port 5 or the second ventilation port 6, the area of the intake port can be increased, which is the case during either the cooling operation or the heating operation. However, a sufficient amount of air can be obtained.
As a result, the temperature distribution of the air in the indoor space N can be made uniform even in either the cooling operation or the heating operation.

Next, the heat exchanger 8 of this embodiment will be described with reference to FIGS. 6 and 7. As shown in FIG. 6, the fin 81 of the heat exchanger 8 is formed in a serrated shape at both ends in the short-side direction (X direction), which is the direction in which air flows. This notched shape is formed by a plurality of convex corner portions 81a and a plurality of concave corner portions 81b. The angle of each convex corner portion 81a is 120°, and the angle of each concave corner portion 81b is 240°.

The heat transfer tubes 82 are arranged in a zigzag manner in a plurality of rows in the lateral direction and a plurality of rows in the longitudinal direction. The heat transfer tubes 82 are provided with the same distance L connecting the centers 82c of the adjacent heat transfer tubes 82. In the present embodiment, the heat transfer tubes 82 of the heat exchanger 8 are configured in 3 rows and 16 stages.

At one end portion (front end portion) 81F of the fin 81, five convex corner portions 81a and four concave corner portions 81b are alternately provided in the longitudinal direction (Y direction), and similarly the other end portion ( Also on the rear side end portion) 81B, five convex corner portions 81a and four concave corner portions 81b are alternately provided in the longitudinal direction. Assuming that the number of convex corners 81a provided at one end 81F, 81B in the lateral direction of the fin 81 is n, the number of concave corners 81b is set to n-1. Although the number n of the convex corners 81a is set to 5 in the present embodiment, the number n is not limited to this and may be any integer of 2 or more.

At the front end 81F of the fin 81, convex corners 81a are formed at the positions of the first stage (lowermost stage), the fifth stage, the seventh stage, the eleventh stage, and the thirteenth stage of the heat transfer tube 82. Is provided. Then, the concave corner portions 81b are provided at the positions of the fourth, sixth, eighth, and twelfth stages of the heat transfer tube 82.
On the other hand, the rear end portion 81B of the fin 81 has convex angles at the positions of the fourth, sixth, eighth, twelfth, and sixteenth stages (uppermost stage) of the heat transfer tube 82. The portion 81a is provided. Then, concave corner portions 81b are provided at the fifth, seventh, eleventh and thirteenth positions of the heat transfer tube 82.

Further, the convex corner portion 81a and the concave corner portion 81b of the fin 81 have apex v of each corner portion on extension lines SL1 to SL16 of a line connecting the centers of the heat transfer tubes 82 in the same step. For example, on the extension line SL4 connecting the centers of the fourth-stage heat transfer tubes 82, the apex v of the concave corner 81b is provided at the front end 81F of the fin 81, and the rear end of the fin 81 is provided. The apex v of the convex corner portion 81a is provided on the portion 81B. Similarly, on the extension line SL13 connecting the centers of the thirteenth heat transfer tubes 82, the apex v of the convex corner 81a is provided at the front end 81F of the fin 81, and the rear side of the fin 81 is provided. The apex v of the concave corner portion 81b is provided at the end portion 81B.

A concave corner portion 81b corresponding to the convex corner portion 81a of the front end portion 81F is provided on the rear end portion 81B of the lowermost step (first step), which is one end portion in the longitudinal direction of the fin 81. Absent. Similarly, a concave corner portion 81b corresponding to the convex corner portion 81a of the rear side end portion 81B is provided at the front end portion 81F of the uppermost step (16th step) which is the other end portion in the longitudinal direction of the fin 81. Not not. That is, the concave corner portions 81b are not provided at both ends of the fin 81 in the longitudinal direction. As a result, since the projection 81t as shown by the broken line in FIG. 6 is not formed on the fin 81, when the heat exchanger 8 is installed in the indoor unit 1, the projection 81t is crushed and drainage drainage performance deteriorates. And the ventilation resistance does not increase.

FIG. 7: is a figure which shows the difference of the length dimension of a lateral direction by the difference in the number n of the convex corners provided in the heat exchanger 8.
In FIG. 7, the heat exchanger 8 of the present embodiment (n=5; jagged shape), the heat exchanger 8′ of Comparative Example 1 (n=2; Z shape) and the heat exchanger 8″ of Comparative Example 2″ (n =1; straight shape) of the three heat exchanger fins are overlapped and displayed. The short-side dimensions of these three heat exchangers 8, 8′, 8″ are c, c′, c, respectively. ”
Further, the three heat exchangers 8, 8 ′, 8 ″ are heat exchangers in which the heat transfer tubes 82 in three rows and 16 stages are arranged in a zigzag manner, and the distances connecting the centers of the adjacent heat transfer tubes 82 are equal to each other. Yes, the front area is the same.
As shown in FIG. 7, the heat exchanger 8 of this embodiment has the smallest dimension in the lateral direction of the three heat exchangers. That is, the heat exchanger 8 of the present embodiment can have a smaller dimension in the lateral direction than the Z-shaped heat exchanger 8′ of Comparative Example 1.
In particular, when the heat exchanger is arranged between the two fans 9 and 10 as in the indoor unit 1 of the present embodiment, the distance between the heat exchanger and the fan is larger than in Comparative Example 1 and Comparative Example 2. Since the size can be made smaller, the size of the indoor unit 1 in the depth direction can be made smaller.

With the configuration described above, the heat exchanger 8 of the present embodiment can reduce the dimension in the lateral direction while maintaining the front surface area. Furthermore, by using the heat exchanger 8 of this embodiment, the size of the indoor unit 1 can be made more compact.

Although the embodiments of the present invention have been described, the embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiment can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the spirit of the invention. The modifications of the embodiments are included in the invention described in the claims and the equivalents thereof as well as included in the scope and the gist of the invention.

DESCRIPTION OF SYMBOLS 1... Indoor unit, 2... Housing|casing, 3... Inner wall part, 4... Guide part, 5... 1st ventilation port, 6... 2nd ventilation port, 7... Ventilation path, 8... Heat exchanger, 81... Fin, 82 ... Heat transfer tube, 9... First fan, 10... Second fan, 11... First horizontal louver, 12... Second horizontal louver, 20... Drain pan, 21... Filter section, 31... Controller, A... Air conditioner, B... Outdoor unit, C... Air (air flow), H... Air (air flow), K... Wall, N... Indoor space, T... Ceiling, U... Floor surface

Claims (6)

A plurality of fins provided with a gap,
A plurality of heat transfer tubes provided orthogonal to the plurality of fins,
In a heat exchanger equipped with
The plurality of fins are provided with a plurality of convex corner portions and a plurality of concave corner portions at both ends in the lateral direction,
The plurality of heat transfer tubes are arranged in a staggered manner in a plurality of stages in the longitudinal direction of the fins and a plurality of rows in the lateral direction, and the distances connecting the centers of the adjacent heat transfer tubes are equal to each other. The heat exchanger according to claim 1, wherein each of the plurality of convex corner portions has an angle of 120°, and each of the plurality of concave corner portions has an angle of 240°. The heat exchange according to claim 2, wherein the number of the plurality of convex corner portions provided at one end in the lateral direction of the fin is an integer n of 2 or more, and the number of the plurality of concave corner portions is n-1. vessel. With the apex of the convex corner portion or the concave corner portion on the extension line of a straight line connecting the centers of the same stage of the heat transfer tube,
When the convex corner portion is provided at one end portion in the lateral direction of the fin, the concave corner portion is provided at the other end portion in the same step,
The heat exchanger according to claim 3, wherein when the concave corner portion is provided at one end portion in the lateral direction of the fin, the convex corner portion is provided at the other end portion of the same stage. The heat exchanger according to claim 4, wherein the concave corners are not provided at both ends of the fin in the longitudinal direction. An air conditioner comprising the heat exchanger according to any one of claims 1 to 5.

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