JPWO2018235134A1 - Unit, air conditioner, and method of manufacturing heat exchanger - Google Patents

Abstract

A unit according to the present invention includes a housing, a first heat exchanger unit installed in the housing, and having an upper end inclined when viewed from the side in the installed state, and a first heat exchange unit of the housing. A second heat exchanger unit that is disposed above the heat exchanger unit, and is inclined and disposed such that the lower part is located on the front side and the upper part is located on the rear side when viewed from the side in the installed state; And a blower fan installed on the back side of the housing with respect to the heat exchanger unit and the second heat exchanger unit, wherein the upper end is downward from the upstream to the downstream of the flow of the air sucked by the blower fan. It is inclined.

Description

  The present invention relates to a unit including a fin-and-tube heat exchanger (hereinafter, referred to as a “heat exchanger”), an air conditioner including the unit, and a method for manufacturing a heat exchanger.

  A conventional heat exchanger for an air conditioner includes a heat exchanger arranged in a ventilation path from an air inlet to an air outlet of an air conditioner. The first and second heat exchanger units each have a rectangular parallelepiped shape in which a large number of strip-shaped radiating fins are arranged at a predetermined pitch along one of the first heat exchanger units. A second inclined axis, which is disposed obliquely at a predetermined angle on the bottom side of the road and at which the other second heat exchanger unit intersects the first inclined axis of the first heat exchanger unit at a predetermined angle. A heat exchanger that is disposed above the first heat exchanger unit along the first heat exchanger unit, and in which each of the distal ends of the first heat exchanger unit and the second heat exchanger unit abuts each other. The front end of the unit has a notch The edge of the acute angle portion of the notch is in contact with the top end of the upper surface of the first heat exchanger unit. reference).

JP 2015-183860 A

  At present, many heat exchangers have been subjected to a surface treatment for improving the hydrophilicity of the fin surface in order to improve drainage of dew condensation water attached to the fin surface. However, depending on the environment in which the heat exchanger is provided, for example, oil particles generated during oil cooking or grilled meat cooking adhere to the fins, causing the fin surfaces to be water-repellent and deteriorating the fin surface conditions. There is. In addition, chemical components generated from new building materials or contaminated air may dissolve into the dew condensation water, deteriorating the hydrophilicity of the surface-treated fins and deteriorating the surface condition of the fins.

  In general, during the cooling operation or the dry operation of the air conditioner, in the initial state of the indoor unit, the condensed water generated on the long side facing upwards of the fins immediately permeates between the fins, and the lower part of the heat exchanger. And is discharged to the outside of the fuselage.

  However, when the surface condition of the fins deteriorates, the condensed water generated and grown on the long side facing upwards of the fins slides on the long side and follows the condensed water generated below it one after another. To form larger water droplets and move downward at an increased speed. The condensed water that has moved vigorously may jump to a nearby filter or a suction unit of an indoor unit at the lowermost end of the long side of the fin facing upward. Further, the condensed water that has flowed out leaks out of the airframe without being collected in the dew tray. As a result, there arises a problem that a floor or the like in a room near the position where the indoor unit is installed becomes dirty.

  The present invention has been made in order to solve the problems as described above, and provides a unit capable of suppressing jumping of water droplets, an air conditioner including the unit, and a method of manufacturing a heat exchanger. It is aimed at.

  A unit according to the present invention includes a housing, a first heat exchanger unit installed in the housing, and having an upper end inclined when viewed from the side in the installed state, and the first heat exchanger unit of the housing. A second heat exchanger unit that is disposed above the first heat exchanger unit and that is inclined so that the lower part is located on the front side and the upper part is located on the rear side when viewed from the side in the installed state; And a blower fan installed on the back side of the housing with respect to the first heat exchanger unit and the second heat exchanger unit, wherein the upper end portion of the air sucked by the blower fan is provided. The flow is inclined downward from upstream to downstream.

  An air conditioner according to the present invention includes the above-described unit and a heat-source-side unit, and has a refrigerant circuit formed by pipe-connecting element devices mounted on each unit. .

  The method for manufacturing a heat exchanger according to the present invention includes a first heat exchanger unit including a plurality of first heat transfer tubes and a plurality of first heat radiation fins into which the first heat transfer tubes are inserted; A second heat transfer unit, a plurality of second radiating fins through which the second heat transfer tube is inserted, and a second heat exchanger unit different from the first heat exchanger unit. In a manufacturing method, a rectangular plate-like member serving as the first radiator fin and the second radiator fin is cut into two, and one of the cut plate-like members is used as the first radiator fin, A heat exchanger unit is formed, and the other of the cut plate-shaped members is used as the second radiating fin to form the second heat exchanger unit, wherein the first heat exchanger unit and the second heat exchanger unit are A cut portion of the plate-like member serving as the first radiating fin; Serial in which the heat exchanger is formed by a cutting portion of the plate-like member made of a second heat radiation fins arranged as a boundary.

  According to the unit according to the present invention, since the upper end of the first heat exchanger unit is inclined downward from the upstream to the downstream of the air flow, the first heat exchanger unit can be moved from the second heat exchanger unit to the first heat exchanger unit. The water drops flowing down on the upper end portion flow toward the direction of gravity, so that the water drops can be prevented from jumping out.

FIG. 2 is a schematic configuration diagram illustrating an example of a refrigerant circuit configuration of the air conditioner according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram schematically showing a configuration of a central portion of the first unit according to Embodiment 1 of the present invention when viewed from a side. FIG. 5 is a side view schematically showing a state where the heat exchanger mounted on the first unit according to Embodiment 1 of the present invention is viewed from the side. FIG. 4 is an enlarged side view showing a part of the heat exchanger shown in FIG. 3 in an enlarged manner. It is explanatory drawing of the conventional example which showed typically an example of the flow of the water droplet in the situation in which the radiation fin of the 2nd heat exchanger unit is not made water-repellent. It is explanatory drawing of the conventional example which showed typically an example of the flow of the water droplet in the state which made the radiation fin of the 2nd heat exchanger unit water-repellent. It is explanatory drawing of the conventional example which showed typically another example of the flow of the water droplet in the state which made the radiation fin of the 2nd heat exchanger unit water-repellent. FIG. 3 is a table showing angles φ, angles θ, and how water droplets move. It is an expanded side view which expands and shows the state which looked at a part of modification of the heat exchanger mounted in the 1st unit concerning Embodiment 1 of the present invention from the side. It is an expanded side view which expands and shows the state which looked at a part of modification of the heat exchanger mounted in the 1st unit concerning Embodiment 1 of the present invention from the side. It is an expanded side view which expands and shows the state which looked at a part of modification of the heat exchanger mounted in the 1st unit concerning Embodiment 1 of the present invention from the side. It is an expanded side view which expands and shows the state which looked at a part of modification of the heat exchanger mounted in the 1st unit concerning Embodiment 1 of the present invention from the side. It is a schematic diagram for explaining a part of the manufacturing method of the heat exchanger according to Embodiment 2 of the present invention. FIG. 14 is a schematic diagram for explaining a heat exchanger formed by the manufacturing method of FIG. 13. 14 is a graph showing a relationship between an angle α, an angle β, and BG / CD in the heat exchanger formed by the manufacturing method of FIG. 16 is a graph showing an area X shown in FIG. 15 in an enlarged manner. FIG. 9 is a schematic diagram for explaining a modification of the heat exchanger formed by the method for manufacturing a heat exchanger according to Embodiment 2 of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following drawings including FIG. 1, the size relationship of each component may be different from the actual one. In addition, in the drawings including FIG. 1, the same reference numerals denote the same or corresponding components, and this is common throughout the entire specification. Further, the forms of the components shown in the entire text of the specification are merely examples, and the present invention is not limited to these descriptions.

Embodiment 1 FIG.
FIG. 1 is a schematic configuration diagram illustrating an example of a refrigerant circuit configuration of an air conditioner 100 according to Embodiment 1 of the present invention. In FIG. 1, the flow of the refrigerant during the cooling operation is indicated by solid arrows, and the flow of the refrigerant during the heating operation is indicated by broken arrows.

<Configuration of air conditioner 100>
As shown in FIG. 1, the air conditioner 100 includes a first unit 100A and a second unit 100B.
The first unit 100A corresponds to a “unit” of the present invention.

The first unit 100A is used as an indoor unit (use side unit), and includes a heat exchanger 30 and a blower fan 20.
The second unit 100B is used as an outdoor unit (heat source side unit), and includes a heat source side heat exchanger 53, a heat source side blower fan 55, a compressor 51, a four-way switching valve 52, and an expansion valve 54. I have.
The first unit 100A and the second unit 100B are connected to each other by a refrigerant pipe 58 including a gas-side communication pipe 56 and a liquid-side communication pipe 57, thereby forming a refrigerant circuit 70.

  In the air conditioner 100, the cooling operation and the heating operation can be switched by switching the path of the four-way switching valve 52. In the case of the path of the four-way switching valve 52 shown by a solid line in FIG. 1, the air conditioner 100 performs a cooling operation. On the other hand, in the case of the path of the four-way switching valve 52 shown by the broken line in FIG. 1, the air conditioner 100 performs the heating operation.

(1st unit 100A)
The first unit 100A is installed in a space that supplies cold or warm heat to the space to be air-conditioned, and has a function of cooling or heating the space to be air-conditioned by cold or hot heat supplied from the second unit 100B. Examples of the space that supplies cold or warm heat to the air-conditioned space include an indoor air-conditioned space or another space connected to the air-conditioned space via a duct or the like.

The heat exchanger 30 functions as a condenser during a heating operation and functions as an evaporator during a cooling operation. The heat exchanger 30 is constituted by a fin-and-tube heat exchanger.
The blower fan 20 supplies air, which is a heat exchange fluid, to the heat exchanger 30. The blower fan 20 can be constituted by a propeller fan or a cross flow fan having a plurality of blades.

(2nd unit 100B)
The second unit 100B is installed in a space (outdoor) different from the space to be air-conditioned, and has a function of supplying cold or warm heat to the first unit 100A.

The heat source side heat exchanger 53 functions as an evaporator during the heating operation and functions as a condenser during the cooling operation.
The heat source side blower fan 55 supplies air, which is a heat exchange fluid, to the heat source side heat exchanger 53. The heat source side blower fan 55 can be configured by a propeller fan having a plurality of blades.

  The compressor 51 compresses and discharges the refrigerant. The compressor 51 can be composed of a rotary compressor, a scroll compressor, and the like. When the heat source side heat exchanger 53 functions as a condenser, the refrigerant discharged from the compressor 51 is sent to the heat source side heat exchanger 53 through the refrigerant pipe 58. When the heat source side heat exchanger 53 functions as an evaporator, the refrigerant discharged from the compressor 51 passes through the refrigerant pipe 58, passes through the first unit 100A, and is sent to the heat source side heat exchanger 53.

The four-way switching valve 52 is provided on the discharge side of the compressor 51, and switches the flow of the refrigerant between the heating operation and the cooling operation.
When the refrigerant is circulated in one direction, the four-way switching valve 52 is not an essential component. Further, as a substitute for the four-way switching valve 52, a combination of a two-way valve or a three-way valve may be used.

The expansion valve 54 expands the refrigerant that has passed through the heat exchanger 30 or the heat source side heat exchanger 53 to reduce the pressure. The expansion valve 54 may be constituted by an electric expansion valve or the like capable of adjusting the flow rate of the refrigerant.
Note that the expansion valve 54 may be arranged in the first unit 100A instead of the second unit 100B.

  The refrigerant circuit 70 included in the air conditioner 100 is configured such that the compressor 51, the heat exchanger 30, the expansion valve 54, and the heat source side heat exchanger 53, which are component devices mounted on each unit, are connected by a refrigerant pipe 58. Connected and formed.

<Operation of air conditioner 100>
Next, the operation of the air conditioner 100 will be described together with the flow of the refrigerant. Here, the operation of the air conditioner 100 will be described by taking as an example a case where the heat exchange fluid that exchanges heat with the refrigerant in the heat exchanger 30 and the heat source side heat exchanger 53 is air.

First, a cooling operation performed by the air conditioner 100 will be described.
By driving the compressor 51, a refrigerant in a high-temperature and high-pressure gas state is discharged from the compressor 51. Hereinafter, the refrigerant flows according to the solid arrows. The high-temperature and high-pressure gas refrigerant (single-phase) discharged from the compressor 51 flows through the four-way switching valve 52 into the heat source side heat exchanger 53 functioning as a condenser. In the heat source side heat exchanger 53, heat exchange is performed between the flowing high-temperature and high-pressure gas refrigerant and air supplied by the heat source-side blowing fan 55, and the high-temperature and high-pressure gas refrigerant condenses and has a high pressure. It becomes a liquid refrigerant (single phase).

  The high-pressure liquid refrigerant sent from the heat-source-side heat exchanger 53 is turned into a two-phase refrigerant of a low-pressure gas refrigerant and a liquid refrigerant by the expansion valve 54. The refrigerant in the two-phase state flows into the heat exchanger 30 functioning as an evaporator. In the heat exchanger 30, heat exchange is performed between the flowing two-phase refrigerant and the air supplied by the blower fan 20, and the liquid refrigerant among the two-phase refrigerant evaporates to produce a low-pressure gas. It becomes a refrigerant (single phase). This heat exchange cools the room. The low-pressure gas refrigerant sent from the heat exchanger 30 flows into the compressor 51 via the four-way switching valve 52, is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 51 again. Hereinafter, this cycle is repeated.

Next, a heating operation performed by the air conditioner 100 will be described.
By driving the compressor 51, a refrigerant in a high-temperature and high-pressure gas state is discharged from the compressor 51. Hereinafter, the refrigerant flows according to the dashed arrows. The high-temperature and high-pressure gas refrigerant (single phase) discharged from the compressor 51 flows through the four-way switching valve 52 into the heat exchanger 30 functioning as a condenser. In the heat exchanger 30, heat exchange is performed between the flowing high-temperature and high-pressure gas refrigerant and the air supplied by the blower fan 20, and the high-temperature and high-pressure gas refrigerant is condensed and the high-pressure liquid refrigerant Phase). This heat exchange heats the room.

  The high-pressure liquid refrigerant sent from the heat exchanger 30 is turned into a two-phase refrigerant of a low-pressure gas refrigerant and a liquid refrigerant by the expansion valve 54. The refrigerant in the two-phase state flows into the heat source side heat exchanger 53 functioning as an evaporator. In the heat source side heat exchanger 53, heat exchange is performed between the two-phase refrigerant flowing in and the air supplied by the heat source side blower fan 55, and the liquid refrigerant among the two-phase refrigerant evaporates. To a low-pressure gas refrigerant (single phase). The low-pressure gas refrigerant sent from the heat source side heat exchanger 53 flows into the compressor 51 via the four-way switching valve 52, is compressed to become a high-temperature and high-pressure gas refrigerant, and is discharged from the compressor 51 again. Hereinafter, this cycle is repeated.

<Details of Unit (First Unit) According to Embodiment 1 of the Present Invention>
Next, the first unit 100A according to Embodiment 1 of the present invention will be described in detail. FIG. 2 is a schematic diagram schematically showing the configuration of the central portion of the first unit 100A as viewed from the side. The first unit 100A will be specifically described based on FIG.

(Configuration of the first unit 100A)
As shown in FIG. 2, the first unit 100A includes a housing 10, a blower fan 20, a casing 15, a heat exchanger 30, a filter 42, left and right flaps 13, an upper flap 16, and a lower flap. 17, a front grille 12, and a nozzle 18. Hereinafter, each component will be described individually.

  The housing 10 is formed in a horizontally long rectangular parallelepiped shape when installed. The housing 10 forms an outer shell of the first unit 100A, and an opening functioning as a suction port 11 is formed on a top surface, and an opening functioning as an air outlet 14 is formed on a lower surface and a front surface. ing. In addition, the suction port 11 may be formed in the upper portion of the front surface of the housing 10 or in both the top surface and the upper portion of the front surface. Further, the outlet 14 may be formed on the lower surface or the front surface. The housing 10 includes a blower fan 20, a casing 15, a heat exchanger 30, a filter 42, a drain pan 41, and an electric component box (not shown).

  The blower fan 20 is installed inside the housing 10 and sucks air and blows out the sucked air. The blower fan 20 is installed in an air passage 40 extending from the inlet 11 to the outlet 14 at a substantially central portion when the casing 10 is viewed from the side. When the blower fan 20 is driven, air is sucked into the casing 10 through the suction port 11 and supplied to the heat exchanger 30. It will be blown out of the body 10. The blower fan 20 can be configured by a cross flow fan, a propeller fan, or the like.

The casing part 15 is installed inside the housing 10 and guides the wind blown by the blower fan 20 to the blower outlet 14, and determines the blowout direction of the air blown from the blower fan 20. The casing portion 15 is formed in a curved shape in a side view so as to extend from the back side of the blower fan 20 to the outlet 14.
In some cases, a wind having a high wind speed collides with the casing portion 15, and water droplets flying through the heat exchanger 30 adhere to the casing portion 15.

  The heat exchanger 30 generates conditioned air by exchanging heat of the air sucked by the blower fan 20 with the refrigerant flowing through the refrigerant circuit 70. Specifically, the heat exchanger 30 is disposed between the suction port 11 and the blower fan 20, and reconciles the air sucked from the suction port 11. The heat exchanger 30 includes a heat transfer tube 50 and a radiation fin 60 through which the heat transfer tube 50 is inserted. The air conditioned by the heat exchanger 30 includes cooling air during a cooling operation, heating air during a heating operation, and dehumidification air during a dehumidification operation. The arrangement of the heat exchanger 30 will be described later in detail.

The filter 42 is installed inside the housing 10 and on the upstream side of the air flow of the heat exchanger 30, and captures dust contained in the air sucked by the blower fan 20. The filter 42 is installed detachably.
Note that the filter 42 is not an essential component.

  The left and right flaps 13 change the direction of the air blown out from the outlet 14 in the left-right direction. The left and right flaps 13 are composed of flat wind direction plates having various outer shapes formed of resin, and a plurality of the left and right flaps 13 are provided in the width direction of the housing 10 and serve to deliver air blown out from the air outlet 14 in the left and right direction.

The upper flap 16 and the lower flap 17 change the direction of air blown from the outlet 14 in the vertical direction. The upper flap 16 and the lower flap 17 are configured by flat wind direction plates having various outer shapes formed of resin, and are installed so as to close the air outlet 14 at the time of stoppage, and supply air blown out of the air outlet 14 at the time of operation. It has the role of sending it up and down.
Although the case where the upper and lower wind directions are changed by two flaps is shown as an example, the number of flaps may be one or three or more. Further, it is not always necessary to close the air outlet 14 when stopping.

The nozzle 18 is located below the heat exchanger 30 and is provided from the front grill 12 toward the blower fan 20. The upper surface of the nozzle 18 (on the side of the heat exchanger 30) functions as a drain pan 41.
The drain pan 41 is provided below the heat exchanger 30 and stores water (condensed water, condensed water, and the like, the same hereinafter) generated in the heat exchanger 30.
The electrical component box stores electrical components such as a control board.
The front grille 12 is attached to the front surface of the housing 10 so as to be openable and closable and detachable, and serves as a design surface of the first unit 100A.

  2, the heat exchanger 30 is arranged so as to surround the top surface and the front surface of the blower fan 20, but the arrangement of the heat exchanger 30 is limited to the arrangement shown in FIG. is not.

<Details of heat exchanger>
FIG. 3 is a side view schematically showing a state where the heat exchanger mounted on the first unit according to Embodiment 1 of the present invention is viewed from the side. FIG. 4 is an enlarged side view showing a part of the heat exchanger shown in FIG. 3 in an enlarged manner. The configuration of the heat exchanger 30 will be described in detail with reference to FIGS.
In FIG. 4, the flow of water is indicated by a thick arrow. Further, in FIG. 4, the angle formed by the upper end 31a with respect to the horizontal direction, that is, the angle formed by the upper end 31a and the horizontal line is shown as an angle φ. In FIG. 4, the angle formed by the lower end 32a with respect to the horizontal direction, that is, the angle formed by the lower end 32a and the horizontal line is shown as an angle θ.

As shown in FIG. 3, the heat exchanger 30 includes a first heat exchanger unit 31 installed below the front side of the housing 10 and a second heat exchanger unit 32 installed above the front side of the housing 10. , And a third heat exchanger unit 33 installed above the rear side of the housing 10.
Further, since the heat exchanger 30 is a fin-and-tube heat exchanger, each of the first heat exchanger unit 31, the second heat exchanger unit 32, and the third heat exchanger unit 33 includes a plurality of heat exchangers. It includes a heat transfer tube 50 and a plurality of radiating fins 60 through which the heat transfer tube 50 is inserted.

The heat transfer tube 50 is configured as a circular tube. A plurality of heat radiation fins 60 are joined to the heat transfer tube 50.
The radiation fins 60 are made of a thin aluminum plate. The heat transfer tube 50 and the radiation fins 60 are joined by brazing.
Although the case where the heat transfer tube 50 is a circular tube is shown here as an example, a flat tube having a flat cross section may be used as the heat transfer tube 50.

In the first heat exchanger unit 31, the radiation fins 60 have a trapezoidal shape when viewed from the side when installed in the housing 10. At this time, the short side portion located above the first heat exchanger unit 31 is referred to as an upper end 31a, and the long side portion located on the front side is referred to as a first front side end 31e. Further, a corner located at the upper front side of the first heat exchanger unit 31 is referred to as a corner A, and a corner located at the upper rear side of the first heat exchanger unit 31 is referred to as a corner B.
Note that the radiation fins 60 of the first heat exchanger unit 31 need not be strictly trapezoidal when viewed from the side.

In the second heat exchanger unit 32, the radiation fins 60 have a rectangular shape when viewed from the side when installed in the housing 10. The second heat exchanger unit 32 is disposed above the first heat exchanger unit 31 of the housing 10, the lower part is located on the front side when viewed from the side in the installed state, and the upper part is located on the rear side. It is inclined to be located. At this time, a short side portion located below the second heat exchanger unit 32 is referred to as a lower end portion 32a, and a long side portion located on the front side is referred to as a second front side end portion 32e. The corner located at the lower part on the front side of the second heat exchanger unit 32 is called a corner C, and the corner located at the lower part on the back side of the second heat exchanger unit 32 is called a corner D.
Note that the radiation fins 60 of the second heat exchanger unit 32 need not be strictly rectangular when viewed from the side.

In the third heat exchanger unit 33, the radiation fins 60 have a rectangular shape when viewed from the side while being installed in the housing 10.
The radiating fins 60 of the second heat exchanger unit 32 and the radiating fins 60 of the third heat exchanger unit 33 need not be strictly rectangular when viewed from the side.

The first heat exchanger unit 31 and the second heat exchanger unit 32 are arranged such that an extension of the second front end 32 e of the second heat exchanger unit 32 intersects the upper end 31 a of the first heat exchanger unit 31. A heat exchanger unit 32 is arranged.
In addition, as shown in FIG. 4, when the first heat exchanger unit 31 is installed in the housing 10, the upper end 31a is inclined at an angle φ with respect to the horizontal direction. The upper end 31a is inclined so as to descend from the front side to the rear side. That is, the upper end portion 31a is inclined downward from the upstream to the downstream of the flow of the air sucked by the blower fan 20.

  Next, the flow of water droplets from the second heat exchanger unit to the first heat exchanger unit will be described based on a conventional example. FIG. 5 is an explanatory diagram of a conventional example schematically showing an example of a flow of water droplets in a situation where the radiation fins of the second heat exchanger unit are not made water repellent. FIG. 6 is an explanatory view of a conventional example schematically showing an example of the flow of water droplets in a state where the radiation fins of the second heat exchanger unit are made water-repellent. FIG. 7 is an explanatory view of a conventional example schematically showing another example of the flow of water droplets in a state where the radiation fins of the second heat exchanger unit are made water-repellent.

  5 to 7, the heat transfer tube is illustrated as a heat transfer tube 50X. Further, the radiation fins are illustrated as radiation fins 60X. Further, the first heat exchanger unit is illustrated as a first heat exchanger unit 31X. Further, the second heat exchanger unit is illustrated as a second heat exchanger unit 32X. The upper end is illustrated as an upper end 31aX. The lower end is illustrated as a lower end 32aX. In addition, the second front side end is illustrated as a second front side end 32eX. Further, the radiation fins 60X of the first heat exchanger unit 31X have a rectangular shape when viewed from the side. 5 to 7, the flow of water is indicated by a thick arrow.

  In FIG. 5, the radiation fins 60X of the second heat exchanger unit 32X are not water-repellent. In this case, the water generated in the second heat exchanger unit 32X becomes water droplets, flows in the direction of gravity, and penetrates between the radiation fins 60X so as not to jump out of the housing. I have.

  On the other hand, in FIG. 6, the radiation fins 60X of the second heat exchanger unit 32X are made water-repellent. In this case, the water generated in the second heat exchanger unit 32X becomes water droplets, flows downward along the second front end 32eX of the second heat exchanger unit 32X, and jumps out of the housing as it is. Would.

  Alternatively, as shown in FIG. 7, the water generated in the second heat exchanger unit 32X becomes water droplets and flows downward along the second front end 32eX of the second heat exchanger unit 32X. It falls on the upper end 31aX of the first heat exchanger unit 31X. The water droplet that has fallen on the upper end 31aX jumps out of the housing as it is.

  However, in any of the cases shown in FIGS. 6 and 7, some water droplets penetrated between the radiation fins 60X of the first heat exchanger unit 31X, and the jumping out of water droplets could be reduced. .

  In FIG. 7, the first heat exchanger unit 31X and the second heat exchanger unit 32X are arranged such that an extension of the second front end 32eX crosses the upper end 31aX parallel to the horizontal direction. An example of the arrangement state is shown. That is, the first heat exchanger unit 31 </ b> X and the second heat exchanger unit 31 </ b> X are arranged such that the portion located on the front side of the second front end 32 eX is located on the back side of the portion located on the front side of the upper end 31 aX. Two heat exchanger units 32X are arranged.

  On the other hand, in the heat exchanger 30, as shown in FIG. 4, the extension of the second front end 32 e of the second heat exchanger unit 32 is inclined at an angle φ with respect to the horizontal direction. It crosses the upper end 31a of the heat exchanger unit 31.

  In this way, the water generated in the second heat exchanger unit 32 becomes water droplets, flows downward along the second front side end 32e of the second heat exchanger unit 32, and then flows into the first heat exchanger. It falls on the upper end 31a of the exchanger unit 31. Then, the air flows downward along the upper end 31a of the inclined first heat exchanger unit 31. Part of the water droplets penetrates between the radiation fins 60 of the first heat exchanger unit 31 and flows in the direction of gravity. In other words, the water droplets flowing from the second heat exchanger unit 32 to the first heat exchanger unit 31 can flow to the inside of the housing 10, and the water droplets can be prevented from jumping out of the housing 10.

  FIG. 8 is a table showing the angle φ, the angle θ, and how the water droplet moves. Based on FIG. 8, the angle φ, the angle θ, and the manner of movement of a water droplet depending on each angle will be described. The angle θ is fixed at 45 degrees.

When the angle φ was 0 degree, the water droplet jumped out of the housing 10.
When the angle φ was 5 degrees, the water droplets did not jump out of the housing 10 but collided with the upper end portion 31 a and then permeated between the radiation fins 60.
When the angle φ was 10 degrees, the water droplets did not jump out of the housing 10 and permeated between the heat radiation fins 60 after colliding with the upper end 31a.
From the above, it has been found that by setting the angle φ to 5 degrees or more and the angle θ or less, water droplets can permeate between the radiation fins 60 without jumping out of the housing 10 and can prevent dew dropping.

As described above, the extension of the second front side end 32e intersects with the upper end 31a, and the upper end 31a is inclined, so that water droplets that have moved from the second front side end 32e can be removed. Can be prevented from moving outward. Therefore, according to the heat exchanger 30, dew dropping can be suppressed, and the reliability of collecting water droplets in the drain pan 41 is improved.
The angle θ may be any angle at which the lower end 32a does not contact the upper end 31a.

<Modification of heat exchanger 30>
FIGS. 9 to 12 are enlarged side views showing a part of a modification of the heat exchanger mounted on the first unit according to Embodiment 1 of the present invention in an enlarged manner as viewed from the side. The configuration of a modified example of the heat exchanger 30 will be described with reference to FIGS.

  In FIG. 9, when the first heat exchanger unit 31 installed in the housing 10 is viewed from the side, the upper end 31a of the first heat exchanger unit 31 is curved so as to be convex downward. Is shown. As described above, the upper end 31a of the first heat exchanger unit 31 may have a curved shape. By forming the upper end 31a of the first heat exchanger unit 31 into a curved shape, water droplets are less likely to splash and less likely to dew.

  In FIG. 10, the radiation fins 60 of the second heat exchanger unit 32 have a trapezoidal shape when the second heat exchanger unit 32 installed in the housing 10 is viewed from the side. That is, the angle Ψ formed by the lower end 32a of the corner C and the second front end 32e is larger than 90 degrees, the angle of the corner D is smaller than 90 degrees, and the lower end 32a is inclined. ing. As described above, the lower end 32a of the second heat exchanger unit 32 may have a slanted shape. By making the lower end 32a of the second heat exchanger unit 32 have an inclined shape, water droplets are less likely to splash and less likely to dew. Further, water droplets easily fall from the second heat exchanger unit 32 to the first heat exchanger unit 31.

  Further, according to the shape shown in FIG. 10, the corner C is located on the far side of the housing 10 as compared with the shape shown in FIG. Therefore, the probability that water droplets from the second heat exchanger unit 32 fall outside beyond the corner A of the first heat exchanger unit 31 is reduced, and the water droplets from the second heat exchanger unit 32 easily fall on the first heat exchanger unit 31. Is also obtained.

  FIG. 11 shows a state in which the first heat exchanger unit 31 installed in the housing 10 is in a side view and the first heat exchanger unit 31 has a chamfered portion A1 at a corner A of the first heat exchanger unit 31. Is shown. In this way, the first heat exchanger unit 31 may have a shape in which the front side corner of the upper end 31a is obliquely cut. By adopting such a shape, it is difficult for water droplets to bounce and dew to fly, and the upper end 31a of the first heat exchanger unit 31 does not protrude, so that an increase in the size of the housing 10 can be suppressed. However, the chamfered portion A1 is on the front side from a position intersecting with an extension of the second front end 32e.

  In particular, if the inclined side formed by the chamfered portion A1 is made substantially parallel to the second front side end 32e, the first heat exchanger unit 31 does not protrude and the second heat exchanger unit 32 It is also possible to maintain the ease of dropping water drops from the water into the first heat exchanger unit 31.

  FIG. 12 illustrates a state in which the second heat exchanger unit 32 installed in the housing 10 is in a side view and the second heat exchanger unit 32 has a chamfered portion C1 at a corner C of the second heat exchanger unit 32. Is shown. In this manner, the lower end 32a of the second heat exchanger unit 32 may have a shape in which the front side corner is obliquely cut. With such a shape, water droplets that have moved on the lower end 32a are more likely to collide with the upper end 31a, so that dew flying can be suppressed with a higher probability.

As described above, in the unit according to Embodiment 1 of the present invention, the upper end portion 31a is inclined downward from the upstream to the downstream of the flow of the air sucked by the blower fan 20.
Therefore, according to the unit according to Embodiment 1 of the present invention, water droplets flowing down from the second heat exchanger unit 32 to the first heat exchanger unit 31 flow downward along the upper end 31a. In this way, it is possible to prevent water drops from jumping out.

In the unit according to Embodiment 1 of the present invention, when viewed from the side, an extension of the second front end 32e, which is the front end of the second heat exchanger unit 32, intersects with the upper end 31a. Things.
Therefore, according to the unit according to Embodiment 1 of the present invention, the water droplets that have flowed down from the second heat exchanger unit 32 to the first heat exchanger unit 31 are more easily guided to the upper end 31a, and the water droplets jump out. Can be further suppressed.

In the unit according to Embodiment 1 of the present invention, when the angle between the upper end 31a and the horizontal line is angle φ, and the angle between the lower end 32a and the horizontal line is angle θ, the angle φ is 5 degrees. The angle is not less than the angle θ.
Therefore, according to the unit according to Embodiment 1 of the present invention, the water droplets that have flowed down from the second heat exchanger unit 32 to the first heat exchanger unit 31 are more easily guided to the upper end 31a, and the water droplets jump out. Can be further suppressed.

In the unit according to Embodiment 1 of the present invention, when the first heat exchanger unit 31 and the second heat exchanger unit 32 are installed in the housing 10 and the upper end 31a is convex downward when viewed from the side. It is curved so that
Therefore, according to the unit according to the first embodiment of the present invention, since the upper end portion 31a is curved, water droplets are less likely to splash, and less likely to dew.

The unit according to the first embodiment of the present invention is configured such that the angle of the corner C is larger than 90 degrees, the angle of the corner D is smaller than 90 degrees, and the lower end of the second heat exchanger unit 32 is formed. The portion 32a is inclined.
Therefore, according to the unit according to Embodiment 1 of the present invention, the water droplets are more likely to fall from the second heat exchanger unit 32 to the first heat exchanger unit 31 without the water droplets jumping out of the housing 10. .

The unit according to the first embodiment of the present invention has a structure in which the first heat exchanger unit 31 and the second heat exchanger unit 32 are installed in the housing 10 and, when viewed from the side, the front surface of the first heat exchanger unit 31. A chamfered part A1 is provided at a corner A at the upper side.
Therefore, according to the unit according to Embodiment 1 of the present invention, since the chamfered portion A1 is provided at the corner A, the upper end 31a of the first heat exchanger unit 31 does not protrude, and the casing 10 has a large size. Can be suppressed.

The unit according to Embodiment 1 of the present invention has a structure in which the first heat exchanger unit 31 and the second heat exchanger unit 32 are installed in the housing 10 and, when viewed from the side, the front surface of the second heat exchanger unit 32. A chamfered portion C1 is provided at a corner C at the lower side.
Therefore, according to the unit according to Embodiment 1 of the present invention, since the chamfered portion C1 is provided at the corner C, the water droplets can be easily guided to the upper end 31a of the first heat exchanger unit 31.

The air conditioner according to Embodiment 1 of the present invention includes a first unit 100A that is the above-described unit and a second unit 100B that is a heat source-side unit, and includes an element device mounted on each unit. It has a refrigerant circuit 70 formed by connecting pipes.
Therefore, according to the air conditioner according to Embodiment 1 of the present invention, since the air conditioner includes the above-described unit, it is possible to prevent water droplets from jumping out of the unit, and to improve comfort.

Embodiment 2 FIG.
FIG. 13 is a schematic diagram for explaining a part of the method for manufacturing the heat exchanger according to Embodiment 2 of the present invention. FIG. 14 is a schematic diagram for explaining a heat exchanger formed by the manufacturing method of FIG. FIG. 15 is a graph showing the relationship between the angle α, the angle β, and BG / CD in the heat exchanger formed by the manufacturing method of FIG. FIG. 16 is a graph showing the region X shown in FIG. 15 in an enlarged manner. A method for manufacturing a heat exchanger according to Embodiment 2 of the present invention will be described with reference to FIGS. The description of the second embodiment will focus on the differences from the first embodiment, and the same parts as those of the first embodiment will be denoted by the same reference numerals and description thereof will be omitted.

  As described in the first embodiment, the first heat exchanger unit 31 and the second heat exchanger unit 32 include the plurality of heat transfer tubes 50 and the plurality of heat radiation fins 60 through which the heat transfer tubes 50 are inserted. ing. Here, the heat transfer tubes 50 forming the first heat exchanger unit 31 are referred to as first heat transfer tubes 50a, and the radiating fins 60 forming the first heat exchanger unit 31 are referred to as first radiating fins 60a. . Further, the heat transfer tubes 50 forming the second heat exchanger unit 32 are referred to as second heat transfer tubes 50b, and the radiating fins 60 forming the second heat exchanger unit 32 are referred to as second radiating fins 60b.

  FIG. 13 shows a state in which one heat exchanger is divided into two, and the first heat exchanger unit 31 and the second heat exchanger unit 32 are formed with the divided part as a boundary. Specifically, the plate-shaped member that becomes the heat radiation fin 60 is cut into two, and one of the divided is used as the first heat radiation fin 60a of the first heat exchanger unit 31, and the other is divided into the second heat exchanger unit. 32 second radiation fins 60b. Specifically, the angle of both the corner A and the corner B of the cut portion serving as the first radiating fin 60a is different, and the angle of both the corner C and the corner D of the cut portion serving as the second fin 60b. The plate-shaped member is cut so as to be different.

  Then, either the first radiating fin 60a or the second radiating fin 60b is reversed, and the first heat exchanger unit 31 and the second heat exchanger unit 32 are arranged. Further, the first heat exchanger unit 31 is arranged such that the upper end 31a is inclined downward from the upstream to the downstream of the flow of air when viewed from the side while being installed in the housing 10. Further, the second heat exchanger unit 32 is arranged adjacent to the first heat exchanger unit 31 with the cut portion as a boundary. As described above, when the first heat exchanger unit 31 and the second heat exchanger unit 32 are formed, waste when forming the heat exchanger 30 can be reduced, and the productivity is improved.

  The length of the upper end 31a of the first heat exchanger unit 31 thus formed and the length of the lower end 32a of the second heat exchanger unit 32 are the same. Further, the angle α of the acute angle A of the first heat exchanger unit 31 and the angle α of the acute angle D of the second heat exchanger unit 32 are the same. Further, the angle of the obtuse corner B of the first heat exchanger unit 31 and the angle of the obtuse corner C of the second heat exchanger unit 32 are the same.

  FIG. 14 shows a side view of a part of the heat exchanger formed by the manufacturing method of FIG. In FIG. 14, a long side portion opposite to the first front side end portion 31e is a first back side end portion 31d, and a long side portion opposite to the second front side end portion 32e is a second back side end portion 32d. It is illustrated in FIG. In FIG. 14, the front-rear and vertical relationship of the second heat exchanger unit 32 does not always match the front-rear and vertical relationship described in the first embodiment, but the names used in the first embodiment are used as they are. And

  Also in the second embodiment, a corner formed by the first front end 31e of the first heat exchanger unit 31 and the upper end 31a is referred to as a corner A. A corner formed by the first rear end 31d of the first heat exchanger unit 31 and the upper end 31a is referred to as a corner B. The corner formed by the second front side end 32e of the second heat exchanger unit 32 and the lower end 32a is referred to as a corner C. A corner formed by the second rear end 32d of the second heat exchanger unit 32 and the lower end 32a is referred to as a corner D.

A perpendicular line L1 is drawn from the corner C to the second back side end 32d, and an intersection of the perpendicular L1 and the second back side end 32d is defined as a point E.
In addition, a perpendicular L2 is drawn from the corner B to the first front end 31e, and an intersection between the perpendicular L2 and the first front end 31e is defined as a point F.
Then, the distance between the vertex of the corner A and the vertex of the corner B is represented as AB, and the distance between the vertex of the corner C and the vertex of the corner D is represented as CD.
The distance between the vertex of the corner D and the point E is represented as DE.

Further, the angle between CD and DE, that is, the angle of corner D, is defined as angle α, and the angle between CD and AB is defined as angle β.
The point of intersection between the extension of the second front end 32 e of the second heat exchanger unit 32 and the upper end 31 a of the first heat exchanger unit 31 is point G.
The distance between the vertex of the corner B and the point G is represented as BG.

  Even if water droplets flowing in the direction of gravity from the second heat exchanger unit 32 attempt to fly away from the second heat exchanger unit 32 and collide with the first heat exchanger unit 31, the first heat exchanger unit 31 Flows in the direction of gravity along with, and dew flying can be suppressed. In order to do this, it is necessary that BG <CD.

This can be expressed by the following equation.
BG = L1 · sin (α) <CD = L1 · sin (π−α−β)
Therefore, it is desirable that BG / CD = sin (α) / sin (π−α−β) <1. In particular, if the angle α ≦ 45 degrees, it does not depend on the angle β.
Here, FIG. 15 is a graph in which numerical values are assigned to the angles α and β, and the horizontal axis is the angle β and the vertical axis is BG / CD.

As described above, a condition that BG / CD is less than 1 is desirable.
When BG / CD is set to 1 or more, water droplets transmitted through the second front end 32 e of the second heat exchanger unit 32 do not reach the corner B of the first heat exchanger unit 31. Then, there is a possibility that the water droplet collides with the filter 42 and the inner surface of the housing 10 and jumps out of the first unit 100A, resulting in a dew drop failure.
On the other hand, if the BG / CD is set to less than 1, the water droplets transmitted through the second front end 32e of the second heat exchanger unit 32 reach the corner B of the first heat exchanger unit 31. Then, the water droplets flow toward the rear side of the housing 10 along the upper end 31a of the first heat exchanger unit 31 without being ejected to the outside of the first unit 100A, and can be collected by the drain pan 41.

  When bare fins are used as the first radiating fins 60a and the second radiating fins 60b, and the heat exchanger 30 is formed, the BG / CD is 0.96, the angle α is 65 degrees, and the angle β is 45 degrees. It was verified that no dewdrop occurred.

<Modification of heat exchanger 30>
FIG. 17 is a schematic diagram for explaining a modified example of the heat exchanger formed by the method for manufacturing a heat exchanger according to Embodiment 2 of the present invention. A configuration of a modification of the heat exchanger 30 formed by the method for manufacturing a heat exchanger according to Embodiment 2 of the present invention will be described based on FIG.

  As shown in FIG. 17, the same can be considered for the case where the first heat exchanger unit 31 is arranged at an angle. Specifically, the first heat exchanger unit 31 is inclined such that the angle δ between the perpendicular and the first front end 31e, that is, the upper side is located on the front side and the lower side is located on the back side, It may be arranged. By arranging the first heat exchanger unit 31 in this manner, the flow of the air sucked by the blower fan 20 can be made to follow the first heat exchanger unit 31 and the size of the housing 10 can be suppressed from increasing. .

The angle between the second heat exchanger unit 32 and the perpendicular is γ.
The angle formed between the first front-side end 31e of the first heat exchanger unit 31 and the perpendicular is δ.
β = γ + δ.
At this time, when the angle δ was set to 30 degrees, the angle α was set to 65 degrees, and the angle β was set to 45 degrees, it was verified that no dewdrop occurred.

As described above, it is necessary that BG <CD to suppress the dew drop.
When β = γ + δ is applied to the above equation,
BG = L1 · sin (α) <CD = L1 · sin (π−α−γ−δ).
Therefore, it is desirable that BG / CD = sin (α) / sin (π−α−γ−δ) <1. In particular, if the angle α ≦ 45 degrees, it does not depend on the angles γ and δ.

  As described above, if the extension of the second front side end 32e is configured to intersect the upper end 31a, the positions of the corners C and D do not need to be coincident with each other. This has the effect of reducing the amount of dew flying.

As described above, in the method for manufacturing the heat exchanger according to Embodiment 2 of the present invention, the plate-shaped member that becomes the heat radiating fin 60 is cut obliquely into two, one being the first heat fin 60a, and the other being the first heat fin 60a. The second radiation fin 60b is used.
Therefore, according to the method for manufacturing a heat exchanger according to Embodiment 2 of the present invention, waste in forming the heat exchanger 30 is eliminated, and productivity is increased.

  Since the air conditioner 100 includes the first unit 100A and the second unit 100B connected to the first unit 100A, the air conditioner 100 has all the effects of the first unit 100A.

  In the above description, the present invention has been described by taking the first unit 100A installed on the wall surface of the living room as an example. However, the present invention is not limited to this, and the indoor unit may have another structure, for example, a floor-standing indoor unit. The present invention can be applied.

  DESCRIPTION OF SYMBOLS 10 Case, 11 inlet, 12 front grille, 13 right and left flaps, 14 outlet, 15 casing part, 16 upper flap, 17 lower flap, 18 nozzle, 20 blower fan, 30 heat exchanger, 31 first heat exchanger Unit, 31C first heat exchanger unit, 31X first heat exchanger unit, 31a upper end, 31aX upper end, 31d first back side end, 31e first front side end, 32 second heat exchanger Unit, 32X second heat exchanger unit, 32a lower end, 32aX lower end, 32d second rear end, 32e second front end, 32eX second front end, 33 third heat exchanger Unit, 40 air duct, 41 drain pan, 42 filter, 50 heat transfer tube, 50a first heat transfer tube, 50b second heat transfer tube, 50X heat transfer tube, 51 compressor, 52 Four-way switching valve, 53 heat source side heat exchanger, 54 expansion valve, 55 heat source side blower fan, 56 gas side communication pipe, 57 liquid side communication pipe, 58 refrigerant pipe, 60 radiating fin, 60a first radiating fin, 60b second Radiator fin, 60X Radiator fin, 70 Refrigerant circuit, 100 air conditioner, 100A first unit, 100B second unit, A corner, A1 chamfer, B corner, C corner, C1 chamfer, D corner L1 Perpendicular, L2 Perpendicular, X region.

Claims (10)

A housing;
A first heat exchanger unit that is installed in the housing and has an upper end inclined when viewed from the side in the installed state;
The case is disposed above the first heat exchanger unit of the housing, and a lower portion is disposed on the front side when viewed from the side in the installed state, and the upper portion is inclined and disposed such that the upper portion is disposed on the back side. Two heat exchanger units,
A blower fan installed on the back side of the housing than the first heat exchanger unit and the second heat exchanger unit,
The upper end,
A unit that is inclined downward from the upstream side to the downstream side of the flow of the air sucked by the blower fan. When the first heat exchanger unit and the second heat exchanger unit installed in the housing are viewed from the side,
The unit according to claim 1, wherein an extension of a front end of the second heat exchanger unit intersects the upper end. When the first heat exchanger unit and the second heat exchanger unit installed in the housing are viewed from the side,
The angle between the upper end and the horizontal line is an angle φ,
When the angle between the lower end of the second heat exchanger unit and the horizontal line is angle θ,
The unit according to claim 1, wherein the angle φ is not less than 5 degrees and not more than an angle θ. When the first heat exchanger unit and the second heat exchanger unit installed in the housing are viewed from the side,
The upper end,
The unit according to any one of claims 1 to 3, wherein the unit is curved so as to be convex downward. When the first heat exchanger unit and the second heat exchanger unit installed in the housing are viewed from the side,
The lower front corner of the second heat exchanger unit is configured to be larger than 90 degrees, and the lower rear corner of the second heat exchanger unit is configured to be smaller than 90 degrees. The unit according to any one of claims 1 to 4, wherein a lower end of the exchanger unit is inclined. When the first heat exchanger unit and the second heat exchanger unit installed in the housing are viewed from the side,
The unit according to any one of claims 1 to 5, wherein a chamfer is provided at an upper corner of the front side of the first heat exchanger unit. When the first heat exchanger unit and the second heat exchanger unit installed in the housing are viewed from the side,
The unit according to any one of claims 1 to 6, wherein a chamfered portion is provided at a lower corner on the front side of the second heat exchanger unit. A unit according to any one of claims 1 to 7,
A heat source side unit,
An air conditioner having a refrigerant circuit formed by connecting element devices mounted on each unit by piping. A first heat exchanger unit including a plurality of first heat transfer tubes and a plurality of first radiating fins through which the first heat transfer tubes are inserted;
A heat exchanger comprising: a plurality of second heat transfer tubes; and a plurality of second heat radiation fins through which the second heat transfer tubes are inserted, and a second heat exchanger unit different from the first heat exchanger unit. A method of manufacturing an exchanger,
Cutting the rectangular plate-like member to be the first radiating fin and the second radiating fin into two,
Forming the first heat exchanger unit using one of the cut plate-like members as the first radiating fin,
Forming the second heat exchanger unit using the other of the cut plate-shaped members as the second radiating fins,
The first heat exchanger unit and the second heat exchanger unit,
A heat exchanger is formed by arranging a cut portion of the plate member serving as the first radiating fin and a cut portion of the plate member serving as the second radiating fin as a boundary. Production method. Cutting the plate-shaped member so that the angle of both corners of the cut portion serving as the first radiating fin is different, and the angle of both corners of the cut portion serving as the second radiating fin is different;
Reversing either the first radiating fins or the second radiating fins,
The method for manufacturing a heat exchanger according to claim 9, wherein the first heat exchanger unit and the second heat exchanger unit are arranged.

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