WO2017033273A1

WO2017033273A1 - Air conditioner outdoor unit

Info

Publication number: WO2017033273A1
Application number: PCT/JP2015/073799
Authority: WO
Inventors: 彰彦竹内
Original assignee: 三菱電機株式会社
Priority date: 2015-08-25
Filing date: 2015-08-25
Publication date: 2017-03-02
Also published as: CN206905148U; JPWO2017033273A1; JP6486476B2

Abstract

This air conditioner outdoor unit is provided with: a casing; a heat exchanger that is disposed in the casing; a supporting component, which supports a lower end portion of the heat exchanger by covering the lower end portion from the lower side, and which has a drainage hole for draining water to the outside, said water having entered inside; and an insulating sheet, which is disposed between the supporting component and a bottom plate of the casing, and which covers the bottom surface of the supporting component.

Description

Air conditioner outdoor unit

The present invention relates to an outdoor unit of an air conditioner, and particularly to a bottom plate of a casing of the outdoor unit.

Some conventional air conditioners are equipped with heat exchangers that use aluminum for fins and piping. In an outdoor unit of an air conditioner equipped with this type of heat exchanger, when the heat exchanger lower end and the bottom plate of the outdoor unit are in contact with each other, the material of the bottom plate is electrically more precious than aluminum. That is, if the metal has a low ionization tendency, pitting corrosion of the aluminum piping occurs.

In order to prevent the electric corrosion, conventionally, a metal or resin supporting part that is electrically base on aluminum is interposed between the heat exchanger and the bottom plate. However, moisture such as rain water and drain water may accumulate in the support component, and the lower end portion of the heat exchanger may cause electrolytic corrosion due to metal components and acidic components contained in the accumulated moisture.

For this reason, Patent Document 1 describes a structure in which a drainage hole is provided in the support component, and water in the support component is drained from the drainage hole, thereby preventing a puddle from being generated in the support component. .

JP 2013-160444 A

However, the substance discharged from the drain hole of the support part stays and accumulates in the nearby bottom plate, and the accumulated solid matter can contact the bottom plate and the lower end of the heat exchanger through the drain hole provided in the support part. There is sex. When the solid matter contains moisture in this state, there is a problem in that the bottom plate and the lower end portion of the heat exchanger are in electrical communication, and electrolytic corrosion occurs. In addition, solids such as dust and corrosives from surrounding metal parts may accumulate around the support parts of the bottom plate. In this case as well, heat exchange with the bottom plate is caused by the accumulated solids through the drain holes. There was a problem that the lower end of the vessel was in electrical communication and electrolytic corrosion occurred.

The present invention has been made against the background of the above-described problems. Even when a drainage hole is provided in the support component, a highly reliable outdoor unit of an air conditioner that can suppress electrolytic corrosion at the lower end of the heat exchanger. The purpose is to obtain.

An outdoor unit of an air conditioner according to the present invention includes a casing, a heat exchanger disposed in the casing, and a component that covers and supports the lower end portion of the heat exchanger from below, and the water that enters the interior A support component having a drainage hole for draining water to the outside, and an insulating sheet interposed between the support component and the bottom plate of the casing and covering the bottom surface of the support component.

According to the present invention, it is possible to obtain a highly reliable outdoor unit of an air conditioner that can suppress electrolytic corrosion at the lower end of the heat exchanger due to the presence of the insulating sheet even when the drainage hole is provided in the support component.

It is a perspective view of the outdoor unit 100 of the air conditioner according to Embodiment 1 of the present invention. It is a disassembled perspective view of the outdoor unit 100 of the air conditioner according to Embodiment 1 of the present invention. It is the schematic of the heat exchanger 200 installed in the outdoor unit 100 of the air conditioner which concerns on Embodiment 1 of this invention. It is a schematic perspective view of the support component 201 of the outdoor unit 100 for an air conditioner according to Embodiment 1 of the present invention. It is a top view of the support component 201 of the outdoor unit 100 of the air conditioner which concerns on Embodiment 1 of this invention. It is the schematic plan view which extracted the baseplate 300 of the outdoor unit 100 of the air conditioner which concerns on Embodiment 1 of this invention, the support component 201, and those related members. FIG. 7 is a main part schematic enlarged view of the AA cross section of FIG. 6. FIG. 9 is a schematic enlarged view of a main part of the AA cross section of FIG. 6 as in FIG. 7, and shows a state where a deposit 500 is deposited around the support component 201. It is a schematic plan view of the baseplate 300 of the outdoor unit 100 of the air conditioner according to Embodiment 2 of the present invention. FIG. 10 is a main part schematic enlarged view of the BB cross section of FIG. 9.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof is omitted or simplified as appropriate. Moreover, the shape, size, arrangement, and the like of the configurations described in the drawings can be appropriately changed within the scope of the present invention.

Embodiment 1 FIG.
FIG. 1 is a perspective view of an outdoor unit 100 for an air-conditioning apparatus according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the outdoor unit 100 for an air-conditioning apparatus according to Embodiment 1 of the present invention.

As shown in FIG. 1, the casing 100 a of the outdoor unit 100 includes a top plate 101, a front plate 102, a side plate 103, and a bottom plate 300, and further includes a fan grill 104, a connection terminal protective cover 105, and the like. The refrigerant pipe protective cover 106 is provided. As shown in FIG. 2, a heat exchanger 200, a compressor 110, a partition plate 111, a fan motor 112, a fan motor support member 113, a propeller fan 114, and the like are mainly arranged inside the casing 100a of the outdoor unit 100. ing.

The inside of the casing 100a is divided into a machine room 150a and a blower room 150b by a partition plate 111, and a compressor 110 and the like are arranged in the machine room 150a. A member 113, a propeller fan 114, and the like are disposed.

The bottom plate 300 has a box shape with an upper surface opened, and constitutes the bottom of the outdoor unit 100. Parts such as the heat exchanger 200 accommodated in the outdoor unit 100 are installed on the bottom plate 300.

The heat exchanger 200 is formed in a substantially L shape in plan view across the left side surface and the back surface of the blower chamber 150b, and heat exchanger support parts 201 described later are provided at two upper and lower ends on the left front side. (201a, 201b) are provided. Next, the configuration of the heat exchanger 200 will be described in detail with reference to FIG.

FIG. 3 is a schematic diagram of the heat exchanger 200 installed in the outdoor unit 100 of the air conditioner according to Embodiment 1 of the present invention. FIG. 3 shows a state before the heat exchanger 200 is bent into an L shape.
As shown in FIG. 3, the heat exchanger 200 is arranged in parallel with the

header pipes

250 and 251 extending in the vertical direction spaced apart from each other and the

header pipes

250 and 251 spaced apart in the vertical direction. And a plurality of corrugated radiating fins 253 disposed between the adjacent flat tubes 252. The flat tube 252 is a heat transfer tube in which a flow path for circulating a refrigerant is provided, and is arranged extending in the horizontal direction. Both ends of the flat tube 252 are joined to the

header pipes

250 and 251 by, for example, a brazing material so that the inside of the header pipe communicates with each flow path of each flat tube 252.

In order to suppress deformation of the radiation fins 253 on the outer surface side of each of the uppermost and lowermost radiation fins 253 in FIG. Side plate 256 is provided.

A header pipe partition plate 257 is provided in the header pipe 250 so that efficient heat exchange is performed inside the heat exchanger 200. The header pipe partition plate 257 moves the header pipe 250 up and down. It is partitioned. Of the upper and lower rooms of the header pipe 250 partitioned by the header pipe partition plate 257, the connection pipe 254 is connected to the upper side, and the connection pipe 255 is connected to the lower room. The

connection pipes

254 and 255 are connected to a refrigerant channel pipe (not shown).

Note that the structure of the heat exchanger 200 is not limited to this structure. For example, a flat plate-like fin may be used instead of the corrugated fin. Moreover, although the structure which provided the header pipe partition plate 257 in the header pipe 250 was shown, it is good also as a structure where the header pipe partition plate 257 is not provided, or a structure provided with two or more header pipe partition plates 257. Good.

The

header pipes

250 and 251, the flat tubes 252, the radiation fins 253, the

connection pipes

254 and 255, the side plates 256 and the header pipe partition plate 257 are all made of aluminum. Note that aluminum includes aluminum alloy.

The lower end 251a and the upper end 251b of the header pipe 251 are covered with heat

exchanger support parts

201a and 201b as shown in FIG. Hereinafter, these may be collectively referred to as a support component 201. The support component 201 is made of a base metal or resin that is lower than aluminum, and serves to avoid contact between the header pipe 250 and the bottom plate 300, in other words, contact between the lower end portion of the heat exchanger and the bottom plate 300. FIG. 2 shows an example in which two support components 201 are installed above and below one end side (left end side) of the heat exchanger 200 in the left-right direction, but they are also installed on the other end side (right end side). Also good. The support component 201 supports the heat exchanger 200 and avoids contact between the heat exchanger 200 and the bottom plate 300, and the number and position are not particularly limited.

FIG. 4 is a schematic perspective view of support component 201 of outdoor unit 100 for the air conditioner according to Embodiment 1 of the present invention. FIG. 5 is a plan view of support component 201 of outdoor unit 100 for the air conditioner according to Embodiment 1 of the present invention.
The support component 201 includes a bottom surface portion 202a and a side surface portion 202b provided on the outer periphery of the bottom surface portion 202a, and has a bottomed cylindrical shape with one end closed. A drainage hole 210 is formed in the side surface portion 202b of the support component 201 for discharging unnecessary substances such as moisture flowing into the support component 201 to the outside. By providing the drain hole 210, corrosion of the header pipe 250 and refrigerant leakage due to moisture or the like flowing in through the gap between the support components 201 can be suppressed.

FIG. 6 is a schematic plan view in which the bottom plate 300, the support component 201, and their related members of the outdoor unit 100 for an air conditioner according to Embodiment 1 of the present invention are extracted. In the drawing, the support component 201 and the heat exchanger 200 are indicated by broken lines.
The bottom plate 300 is formed with a main discharge hole 301 that is a first discharge hole for discharging unnecessary substances such as rainwater flowing into the bottom plate 300. The main discharge hole 301 is provided below the heat exchanger 200. An insulating sheet 310 is disposed on the bottom plate 300. The insulating sheet 310 will be described with reference to FIGS.

FIG. 7 is a schematic enlarged view of the main part of the AA cross section of FIG.
As shown in FIGS. 6 and 7, the insulating sheet 310 is interposed between the support component 201 and the bottom plate 300 and is provided so as to cover the bottom surface of the support component 201. Specifically, the insulating sheet 310 is configured in a plate shape having a size larger than the bottom surface of the support component 201 and is installed so as to be in contact with the entire bottom surface of the support component 201. The insulating sheet 310 is provided to prevent the lower end portion 251 a of the header pipe 250 and the bottom plate 300 of the casing 100 a from conducting through the drain hole 210. The material of the insulating sheet 310 is an electrical insulator such as butyl rubber or polyester. Moreover, in order for the insulating sheet 310 to fix the position with respect to the baseplate 300, it is preferable to comprise the grounding surface with the baseplate 300 with an adhesive.

FIG. 8 is a schematic enlarged view of the main part of the AA cross section of FIG. 6 as in FIG. 7, and shows a state in which the deposit 500 is deposited around the support component 201.
The deposit 500 is a solid in which dust or sand containing moisture in the air is deposited, or a fluid such as rain water is accumulated. The deposit 500 is integrally deposited on the inner side and the outer side of the side surface portion 202 b of the support component 201 through the drainage hole 210. Although the deposit 500 is not in the initial stage of use, it can be accumulated and flown in with the use of an air conditioner and the passage of years.

When the insulating sheet 310 is not installed, the deposit 500 becomes a conduction path, and the bottom plate 300 and the header pipe 251, which are different metals, are conducted through the drain hole 210, and electric corrosion occurs. However, even if the deposit 500 is generated due to the installation of the insulating sheet 310, if the deposit 500 is smaller than the size of the insulating sheet 310, conduction between the bottom plate 300 and the header pipe 251 can be prevented. Corrosion can be suppressed. Moreover, the installation of the insulating sheet 310 can increase the spatial distance between the bottom plate 300 and the lower end portion 251a of the header pipe 251 and increase the insulation distance between them.

As described above, according to the first embodiment, since the insulating sheet 310 is interposed between the bottom plate 300 of the casing 100a and the support component 201, corrosion and refrigerant leakage due to electrolytic corrosion at the lower end of the heat exchanger. Thus, the outdoor unit 100 for an air conditioner that is highly reliable over a long period of time can be provided.

Embodiment 2. FIG.
FIG. 9 is a schematic plan view of the bottom plate 300 of the outdoor unit 100 for an air conditioner according to Embodiment 2 of the present invention. FIG. 10 is a schematic enlarged view of the main part of the BB cross section of FIG. The following description will focus on the differences of the second embodiment from the first embodiment.
The second embodiment is characterized in that the bottom plate 300 of the first embodiment shown in FIG. 6 further includes a sub discharge hole 350 that is a second discharge hole configured by a through hole. That is, the bottom plate 300 is provided with a main discharge hole 301 and a sub discharge hole 350, and the sub discharge hole 350 is disposed in the vicinity of the insulating sheet 310, in other words, below the periphery of the insulating sheet 310. And In the second embodiment, the sub discharge hole 350 is provided to further enhance the effect of suppressing the generation of the deposit 500.

The effect of suppressing the occurrence of the deposit 500 is affected by the position of the sub discharge hole 350. Specifically, when the horizontal distance α from the end of the insulating sheet 310 on the sub discharge hole 350 side to the end of the sub discharge hole 350 on the insulating sheet 310 side is “0”, that is, the end of the insulating sheet 310 and the sub discharge hole 350 side. When the end of the discharge hole 350 overlaps, the effect of suppressing the generation of the deposit 500 is the highest.

On the other hand, when the distance α is negative, that is, when the insulating sheet 310 is covered on the sub discharge hole 350, the drainage capacity of the sub discharge hole 350 is reduced, and the effect of suppressing the generation of the deposit 500 is reduced. For this reason, the arrangement in which the distance α is negative is inappropriate. In addition, the insulating sheet 310 is often bonded to the bottom plate 300 with an adhesive substance in order to fix the installation position of the insulating sheet 310. However, when the distance α is negative, the adhesive bonding is peeled off.

From the above, the installation where the distance α is “0” is most preferable. However, it is difficult to maintain the distance of α at “0” in any outdoor unit from the viewpoint of manufacturing variations, and if the value is negative, the effect is reduced. For this reason, the distance α is preferably set to about 0 mm to 3 mm.

As described above, according to the second embodiment, the same effects as those of the first embodiment can be obtained, and the following effects can be obtained by further providing the sub discharge hole 350 in the bottom plate 300. That is, it is possible to promote the discharge of unnecessary materials (rain water and foreign matter) in the vicinity of the support component 201 and further suppress the generation of the deposit 500.

Further, since the horizontal distance α between the sub discharge hole 350 and the insulating sheet 310 is set in the range of 0 mm to 3 mm, the drainage ability of the sub discharge hole 350 and the effect of suppressing the generation of the deposit 500 can be obtained. it can.

100 outdoor unit, 100a casing, 101 top plate, 102 front plate, 103 side plate, 104 fan grill, 105 connection terminal protection cover, 106 refrigerant pipe protection cover, 110 compressor, 111 partition plate, 112 fan motor, 113 fan motor Support member, 114 propeller fan, 150a machine room, 150b blower room, 200 heat exchanger, 201 heat exchanger support part, 201a heat exchanger support part, 201b heat exchanger support part, 202a bottom part, 202b side part, 210 Drain hole, 250 header pipe, 251 header pipe, 251a lower end, 251b upper end, 252 flat tube, 253 heat radiation fin, 254 connection piping, 255 connection piping, 256 side plate, 257 header pipe partition Plate, 300 a bottom plate, 301 main discharge hole, 310 insulation sheet, 350 sub-discharge hole, 500 deposits.

Claims

A casing,
A heat exchanger disposed in the casing;
A component that covers and supports the lower end of the heat exchanger from below, and has a drainage hole that drains the water that has entered inside to the outside, and
An outdoor unit of an air conditioner comprising an insulating sheet interposed between the support component and a bottom plate of the casing and covering a bottom surface of the support component.
The outdoor unit of an air conditioner according to claim 1, wherein the bottom plate has a first discharge hole and a second discharge hole for discharging unnecessary materials that have flowed onto the bottom plate.
The outdoor unit of an air conditioner according to claim 2, wherein the first discharge hole is provided below the heat exchanger, and the second discharge hole is provided below the periphery of the insulating sheet.
The outdoor unit for an air conditioner according to claim 2 or 3, wherein a horizontal distance between the second discharge hole and the insulating sheet is set in a range of 0 mm to 3 mm.
The heat exchanger includes a vertically extending header pipe disposed at a distance from each other, a plurality of fins and a plurality of heat transfer tubes provided between the header pipes, and the lower end portion of the heat exchanger. The outdoor unit for an air conditioner according to any one of claims 1 to 4, which is a lower end portion of the header pipe.