JPWO2014199514A1 - Outdoor unit for air conditioner and method for manufacturing outdoor unit for air conditioner - Google Patents

Abstract

The outdoor unit of the air conditioner of the present invention includes a heat exchanger 5 having a plurality of pipes 10, a bottom plate 6 provided below the heat exchanger 5, and a lower end of the heat exchanger 5 among the plurality of pipes 10. And a gap member 15 provided in a gap between the lowermost pipe 11 and the bottom plate 6 arranged.

Description

  The present invention relates to an outdoor unit for an air conditioner and a method for manufacturing the same.

  In an outdoor unit of an air conditioner installed in a building or a commercial facility, a heat exchanger is disposed on the back and side surfaces, and a fan is disposed on the top surface. In the heat exchanger, fins for radiating heat transferred from the circular tube or the flat tube are skewered in a vertical direction with respect to the circular tube or the flat tube in which the refrigerant moves in the tube.

  Conventionally, a heat exchanger is disposed on a bottom plate, bent into, for example, a substantially U-shape, and then lifted across the top of the heat exchanger and attached to an air-conditioning outdoor unit.

However, since the heat exchanger is arranged on the bottom plate, there are the following problems.
Of the pipes connected to flow the refrigerant to the heat exchanger, the pipe arranged at the bottom (hereinafter referred to as “bottom pipe”) has a short distance from the bottom plate.
For this reason, the dew condensation water which the moisture contained in the air heat-exchanged with the heat exchanger condensed may remain between the lowest stage piping and the bottom plate. The accumulated condensed water causes corrosion of the lowermost piping. Further, when the condensed water that has accumulated is frozen, the volume expands, which causes breakage and breakage of the lowermost pipe. Further, when the lowermost pipe and the bottom plate are different types of metal, different metal corrosion (electrolytic corrosion) is likely to occur.
Further, when the lowermost pipe vibrates due to vibration during operation or transportation of the outdoor unit, the lowermost pipe and the bottom plate come into contact with each other, causing breakage and breakage of the lowermost pipe.

  In addition, a connection pipe for supplying a refrigerant to the heat exchanger or a connection pipe such as a U-bend pipe for connecting a plurality of pipes of the heat exchanger to each other is connected to the heat exchanger pipe by brazing. The The brazed portion may swell more than the pipe diameter, and the distance from the bottom plate is further shortened. For this reason, said problem is more remarkable.

In the conventional outdoor unit of an air conditioner, the following techniques have been proposed in order to prevent freezing of water accumulated on the bottom plate of the outdoor unit.
In the technique described in Patent Document 1, a drain outlet is provided at a position of the bottom plate facing the lower surface of the heat exchanger, and condensed water from the heat exchanger is discharged from the drain outlet.
In the technique described in Patent Document 2, a drain port is provided at a position corresponding to the compressor of the bottom plate, and a water channel having a gradient for guiding water toward the drain port is provided.
In the technique described in Patent Document 3, a plurality of louver-like cut-ups are provided at positions corresponding to the heat exchangers on the bottom plate to discharge condensed water.
In the technique described in Patent Document 4, a heat pipe is laid between the heat exchanger and the bottom plate to heat the condensed water, thereby preventing the condensed water from freezing.

JP 2012-225563 A (Claim 1) JP-A-7-41327 (Claim 2) JP-A-9-145095 (Claim 1) JP 2007-10269 (Claim 1)

  In the technique of Patent Document 1, it is necessary to open a drain outlet below the heat exchanger of the bottom plate. The bottom plate is a component that supports a structure such as a heat exchanger, and there is a problem that the strength of the bottom plate decreases when a drain port is opened in the bottom plate.

  The technique of patent document 2 has provided the water channel which has the gradient for guide | inducing water toward a drain outlet. However, depending on the angle of the slope, condensed water may stay on the bottom plate. For this reason, there existed a subject that dew condensation water stagnates between the lowermost piping and bottom plate of a heat exchanger.

  In the technique of Patent Document 3, since a plurality of louver-like cuts are provided on the bottom plate, the opening area of the bottom plate increases. For this reason, the air which flowed into the outdoor unit flowed out from the opening of the bottom plate, and there was a problem that the air volume of the air passing through the heat exchanger was reduced and the heat exchange performance was lowered. In addition, since the opening area of the bottom plate is large, there is a possibility that invasion of small animals, snow, and the like is promoted from the opening of the bottom plate.

  The technique of Patent Document 4 has a problem that the manufacturing cost increases because it is necessary to dispose a heat pipe. Moreover, when the heater provided in the heat pipe broke down, there was a problem that the condensed water was frozen.

  Moreover, in any technique of Patent Documents 1 to 4, when the lowermost pipe vibrates due to vibration during operation or transportation of the outdoor unit, the lowermost pipe and the bottom plate come into contact with each other, and the lowermost pipe is easily damaged. There was a problem.

  Moreover, in the outdoor unit of an air conditioner, when a heat exchanger is arranged on the bottom plate, a member (positioning member) is required to determine the position of the heat exchanger in order to arrange the heat exchanger at a desired position. Become. For example, the heat exchanger is positioned by forming claws on a sheet metal provided in the heat exchanger and inserting the claws into the opening of the bottom plate. However, there is a problem that the manufacturing cost increases by providing such a positioning member.

The present invention was made in order to solve the above problems, and the first object is to make it difficult for dew condensation water to stay between the lowermost piping and the bottom plate of the heat exchanger. An outdoor unit for an air conditioner and a method for manufacturing the outdoor unit for an air conditioner are obtained.
The second object is to obtain an outdoor unit for an air conditioner and a method for manufacturing the outdoor unit for an air conditioner that can prevent contact between the lowermost piping of the heat exchanger and the bottom plate.
The third object is to obtain an outdoor unit for an air conditioner and a method for manufacturing the outdoor unit for an air conditioner that can suppress corrosion of different metals.
The fourth object is to obtain an outdoor unit for an air conditioner and a method for manufacturing the outdoor unit for an air conditioner that can suppress an increase in manufacturing cost.

  An outdoor unit of an air conditioner according to the present invention is disposed at a lower end of a heat exchanger having a plurality of pipes, a bottom plate provided below the heat exchanger, and the plurality of pipes. And a gap member provided in a gap between the lowermost pipe and the bottom plate.

  The present invention makes it difficult for dew condensation water to stay between the lowermost pipe of the heat exchanger and the bottom plate. Further, it is possible to prevent contact between the lowermost pipe of the heat exchanger and the bottom plate.

It is a perspective view of the outdoor unit of the air conditioner which concerns on Embodiment 1 of this invention. It is a perspective view which shows the state by which the heat exchanger of the outdoor unit of the air conditioner which concerns on Embodiment 1 of this invention was mounted on the bottom plate. It is the perspective view which expanded the A section of FIG. It is a perspective view which shows the state which attached the clearance gap member to the lowest stage piping of the heat exchanger of the outdoor unit of the air conditioner which concerns on Embodiment 1 of this invention. It is a perspective view of the clearance gap member of the outdoor unit of the air conditioner concerning Embodiment 1 of the present invention. It is a perspective view of the clearance gap member of the outdoor unit of the air conditioner concerning Embodiment 1 of the present invention.

Embodiment 1 FIG.
1 is a perspective view of an outdoor unit for an air-conditioning apparatus according to Embodiment 1 of the present invention.
As shown in FIG. 1, the outdoor unit 1 of an air conditioner has a large and vertically long casing. Air suction ports 2 for taking air into the interior are provided on the side and back of the housing. The air inlet 2 is formed on three of the four side surfaces of the housing. On the front surface of the housing, a front panel upper 3_1 and a front panel lower 3_2 that are opened and closed when the inside of the housing is maintained are provided. Inside the housing, a heat exchanger 5 is arranged along the air inlet 2. An air outlet 4 for blowing out air is provided on the upper surface of the housing. A fan is installed in the vicinity of the air outlet 4. When the fan rotates, air is sucked from the air suction port 2, passes through the heat exchanger 5, and is blown out from the air outlet 4.
In the first embodiment, a so-called top pro type outdoor unit that takes in air from the air inlet 2 on the side surface of the housing and blows out air from the air outlet 4 on the upper surface of the housing will be described as an example. However, the present invention is not limited to this.

FIG. 2 is a perspective view showing a state in which the heat exchanger of the outdoor unit of the air conditioner according to Embodiment 1 of the present invention is mounted on the bottom plate.
FIG. 3 is an enlarged perspective view of portion A in FIG. FIG. 3 shows a state in which a gap member 15 described later is not attached.
As shown in FIGS. 2 and 3, the heat exchanger 5 is disposed on, for example, an iron bottom plate 6. The heat exchanger 5 includes a plurality of heat radiation fins 8 and a plurality of heat transfer tubes 7. The heat exchanger 5 performs heat exchange between a gas such as air passing between the plurality of heat radiating fins 8 and a refrigerant flowing through the plurality of heat transfer tubes 7. The heat exchanger 5 is formed in, for example, a substantially U shape so as to follow the air suction port 2. In addition, the shape of the heat exchanger 5 is not limited to this.

  The radiation fin 8 is made of, for example, aluminum or an alloy containing aluminum, and has a plate shape. A plurality of the radiation fins 8 are stacked at a predetermined interval, and a gas such as air flows between them. In addition, openings for inserting a plurality of heat transfer tubes 7 are formed in the radiation fins 8, and the heat transfer tubes 7 are inserted into the openings and joined to the plurality of heat transfer tubes 7.

  The plurality of heat transfer tubes 7 are made of, for example, aluminum or an alloy containing aluminum, and are heat transfer tubes having a flat cross-sectional outer shape. The plurality of heat transfer tubes 7 are arranged in a plurality of rows in a row direction intersecting with the air flow direction, and a plurality of rows are arranged in a row direction along the air flow direction. The heat transfer tube 7 is arranged such that the direction of the long axis of the flat tube is parallel to the surface of the bottom plate 6. That is, the plurality of heat transfer tubes 7 are arranged with the flat major axis direction in the air flow direction (row direction) and the flat minor axis direction (step direction) at intervals.

  The heat transfer tube 7 is connected to one end face 9 of the heat exchanger 5 with a plurality of pipes 10 for flowing a refrigerant. The plurality of pipes 10 are made of, for example, aluminum or an alloy containing aluminum. In addition, in this Embodiment 1, although the structure where the piping 10 is connected to the heat exchanger tube 7 is shown, this invention is not restricted to this, You may form the heat exchanger tube 7 and the piping 10 integrally. That is, the heat transfer tube 7 may be extended from the end face 9 of the heat exchanger 5, and the extended portion of the heat transfer tube 7 may be the pipe 10.

  Moreover, the other end surface side (right side in FIG. 2) of the heat exchanger 5 has a shape in which the heat transfer tube 7 is bent in a U shape on the end side in the axial direction. In addition, although the case where the heat exchanger tube 7 is bent in U shape is demonstrated here, this invention is not limited to this. For example, the end of the heat transfer tube 7 in the axial direction may be connected to the heat transfer tube 7 at another stage using a U-bend tube or the like.

  A lead pipe 20 is connected to each of the plurality of pipes 10. The lead pipe 20 is made of, for example, aluminum or an alloy containing aluminum. The lead pipe 20 functions as, for example, a joint for connecting a flat tube and a circular tube. The lead pipe 20 is connected to the pipe 10 by brazing 14. The lead pipe 20 includes a U-bend pipe connected to the heat transfer pipe 7 at the other stage, a distributor for distributing the refrigerant, a refrigerant pipe for connecting the heat exchanger 5 and other components, and the like. Is connected.

Here, the positional relationship between the piping arranged at the lowermost stage of the heat exchanger 5 and the bottom plate 6 will be described.
As shown in FIG. 3, the pipe disposed at the lowermost stage of the heat exchanger 5 (hereinafter referred to as “lowermost pipe 11”) is close to the bottom plate 6.
In a state where a gap member 15 to be described later is not attached, condensed water in which moisture contained in the heat-exchanged air is condensed may stay in the gap 12 between the lowermost pipe 11 and the bottom plate 6. The accumulated condensed water causes corrosion of the lowermost pipe 11. In addition, when the condensed water that has accumulated is frozen, the volume expands, which causes breakage and breakage of the lowermost pipe 11.

  Moreover, when the shape of the lowermost stage piping 11 of the heat exchanger 5 is a flat shape, the area close | similar to the baseplate 6 increases compared with a circular pipe. That is, the amount of dew condensation water staying between the flat bottom pipe 11 and the bottom plate 6 increases. Therefore, the corrosion of the lowermost pipe 11 is likely to proceed as compared with the circular pipe. In addition, the area where the condensed water freezes increases, and the possibility that the lowermost pipe 11 is broken is increased as compared with the circular pipe.

  In addition, when the lowermost pipe 11 and the bottom plate 6 are different types of metal, the condensed water that has accumulated is connected between the lowermost pipe 11 and the bottom plate 6, and a potential difference is generated, thereby causing corrosion of different metals. Also become.

Further, when the lowermost pipe 11 vibrates as shown by the vibration width 13 in FIG. 3 due to vibration during operation or transportation of the outdoor unit 1, the lowermost pipe 11 and the bottom plate 6 come into contact with each other, and the lowermost pipe 11 There is a possibility of breaking.
In particular, the lowermost pipe 11 and the lead pipe 20 are connected by a brazing 14, and the brazing 14 is raised more than the pipe diameter of the lowermost pipe 11. For this reason, the gap 12 between the brazing 14 and the bottom plate 6 is further shortened, and when the lowermost piping 11 vibrates, the lowermost piping 11 and the bottom plate 6 are easily in contact with each other.

For this reason, the outdoor unit 1 of the air conditioner in the first embodiment has a gap 12 between the bottom plate 6 and at least one of the lowermost pipe 11 and the lead pipe 20 connected to the lowermost pipe 11. A gap member 15 is provided on the surface. Hereinafter, the details of the gap member 15 will be described.
The lowermost pipe 11 and the lead pipe 20 connected to the lowermost pipe 11 correspond to the “lowermost pipe” in the present invention.

FIG. 4 is a perspective view showing a state in which the gap member is attached to the lowermost piping of the heat exchanger in the outdoor unit of the air conditioner according to Embodiment 1 of the present invention.
5 and 6 are perspective views of a gap member of the outdoor unit of the air conditioner according to Embodiment 1 of the present invention.
The gap member 15 is made of resin, for example. The gap member 15 is provided in the gap between the lowermost pipe 11 and the bottom plate 6. The gap member 15 may be provided in the gap between the lead pipe 20 connected to the lowermost pipe 11 and the bottom plate 6. Further, the gap member 15 may be provided in both the gap between the lowermost pipe 11 and the bottom plate 6 and the gap between the lead pipe 20 connected to the lowermost pipe 11 and the bottom plate 6.
As described above, by providing the gap member 15 in the gap between the lowermost pipe 11 and the bottom plate 6, it is possible to prevent the dew condensation water from staying in the gap. Further, when the lowermost pipe 11 vibrates due to vibration during operation or transportation of the outdoor unit 1, the gap member 15 functions as a cushioning material, and contact between the lowermost pipe 11 and the bottom plate 6 can be prevented.
The material of the gap member 15 is not limited to resin. For example, it may be made of rubber. In addition, by making the material of the clearance member 15 into a material which has insulation, between the lowermost stage piping 11 and the baseplate 6 can be insulated, dissimilar metal corrosion can be suppressed. Moreover, the vibration of the lowermost stage piping 11 can be suppressed by making the material of the clearance member 15 into the material which has elasticity.

The gap member 15 has a recess 18 having a U-shaped cross section. The burr portions 17 that form both side surfaces of the recess portion 18 are formed with a narrow upper width corresponding to the shape of the lowermost pipe 11. When the lowermost pipe 11 is fitted into the recess 18 of the gap member 15, the gap member 15 is clamped and fixed by the burr portion 17.
In addition, the fixing method of the gap member 15 is not limited to this. For example, the width of the burr 17 that forms both side surfaces of the recess 18 may be slightly narrower than the outer shape of the lowermost pipe 11, and the lowermost pipe 11 may be sandwiched by the elastic force of the burr 17. Further, for example, instead of the concave portion 18, a cylindrical section having a flat cross section is formed, and the end of the lowermost pipe 11 is inserted into the cylindrical portion of the gap member 15, so that the gap member 15 is connected to the lowermost pipe. 11 may be fixed.
As described above, the gap member 15 has a structure that can be fixed to the lowermost pipe 11 without using a tool.

The gap member 15 has a protrusion 16 formed on the bottom plate 6 side. The protrusion 16 has a shape corresponding to an opening 19 (see FIG. 3) formed at a position facing the gap member 15 of the bottom plate 6. When the heat exchanger 5 is placed on the bottom plate 6, the placement position of the heat exchanger 5 is determined by fitting the protrusion 16 of the gap member 15 into the opening 19 of the bottom plate 6.
The opening 19 of the bottom plate 6 is, for example, a quadrangle. The protrusion 16 of the gap member 15 has a cubic shape corresponding to the opening 19. In addition, the shape of the opening 19 and the projection part 16 is not limited to this. For example, the opening 19 may be circular and the protrusion 16 may be cylindrical. The opening 19 may be circular and the protrusion 16 may be cylindrical. Moreover, it is good also as arbitrary shapes, such as trapezoid. That is, the shape of the opening 19 and the protrusion 16 may be any shape as long as the positioning application is satisfied.
Thus, the gap member 15 also has a structure as a component for positioning when the heat exchanger 5 is arranged on the bottom plate 6.

Next, the manufacturing method of the outdoor unit 1 of the air conditioner in Embodiment 1 will be described.
The manufacturing method of the outdoor unit 1 of an air conditioner includes at least the following steps.
Before placing the heat exchanger 5 on the bottom plate 6, the gap member 15 is fitted and fixed to at least one of the lowermost pipe 11 and the lead pipe 20 connected to the lowermost pipe 11.
Next, the protrusion 16 of the gap member 15 is fitted into the opening 19 of the bottom plate 6 to position the heat exchanger 5 on the bottom plate 6.
Thus, the gap member 15 functions as a component that performs positioning when the heat exchanger 5 is disposed on the bottom plate 6. Therefore, it is not necessary to separately provide a component for positioning, and the manufacturing cost can be suppressed.

As described above, in the first embodiment, the gap member 15 is provided in the gap between the lowermost pipe 11 and the bottom plate 6.
For this reason, the dew condensation water from the heat exchanger 5 can be made difficult to stay between the lowermost pipe 11 of the heat exchanger 5 and the bottom plate 6. Further, it is possible to prevent contact between the lowermost pipe 11 and the bottom plate 6 of the heat exchanger 5 due to vibration during operation or transportation of the outdoor unit 1. Therefore, corrosion, breakage, and breakage of the lowermost pipe 11 can be prevented.

Further, in the first embodiment, the gap member 15 is formed with a concave portion 18 having a U-shaped cross section, and the lowermost pipe 11 is fitted and fixed to the concave portion 18.
For this reason, the gap member 15 can be fixed to the lowermost pipe 11 without using a tool. Therefore, an increase in manufacturing cost can be suppressed.

In the first embodiment, the bottom plate 6 is formed with an opening 19 at a position facing the gap member 15, and the gap member 15 is formed with a protrusion 16 that fits into the opening 19 on the bottom plate 6 side. Yes.
For this reason, the gap member 15 functions as a component for positioning when the heat exchanger 5 is disposed on the bottom plate 6. Therefore, it is not necessary to separately provide a component for positioning, and manufacturing costs can be suppressed.

In the first embodiment, the gap member 15 is an insulating material.
For this reason, it is possible to insulate between the lowermost pipe 11 and the bottom plate 6, and even if the lowermost pipe 11 and the bottom plate 6 are different types of metal, it is possible to suppress the corrosion of different metals.

In the first embodiment, the lowermost pipe 11 is a flat tube, and the direction of the long axis of the flat tube is arranged parallel to the surface of the bottom plate 6.
In this way, even when condensed water is likely to stay between the flat bottom pipe 11 and the bottom plate 6 as compared with the circular pipe, the gap between the bottom pipe 11 and the bottom plate 6 can be reduced. Since the gap member 15 is provided, the condensed water from the heat exchanger 5 can be made difficult to stay. Therefore, corrosion, breakage, and breakage of the lowermost pipe 11 can be prevented.

  DESCRIPTION OF SYMBOLS 1 Outdoor unit, 2 Air inlet, 3_1 Front panel top, 3_2 Front panel bottom, 4 Air blower outlet, 5 Heat exchanger, 6 Bottom plate, 7 Heat exchanger tube, 8 Radiation fin, 9 End face, 10 Piping, 11 Bottom piping , 12 gap, 13 vibration width, 14 brazing, 15 gap member, 16 protrusion, 17 burr, 18 recess, 19 opening, 20 lead pipe.

An outdoor unit of an air conditioner according to the present invention is disposed at a lower end of a heat exchanger having a plurality of pipes, a bottom plate provided below the heat exchanger, and the plurality of pipes. A gap member provided in a gap between the lowermost pipe and the bottom plate, and the lowermost pipe is a flat tube, and the orientation of the long axis of the flat tube is parallel to the surface of the bottom plate The gap member is formed with a U-shaped recess, and the width of the upper part of the burr that forms both side surfaces of the recess is formed to be narrower than the long axis of the lowermost pipe, A burr portion sandwiches the lowermost pipe, and the lowermost pipe is fitted and fixed to the recess .

Claims (7)

A heat exchanger having a plurality of pipes;
A bottom plate provided below the heat exchanger;
A gap member provided in a gap between the lowermost pipe arranged at the lower end of the heat exchanger and the bottom plate among the plurality of pipes,
An air conditioner outdoor unit characterized by comprising: The gap member is formed with a U-shaped concave section,
The outdoor unit for an air conditioner according to claim 1, wherein the lowermost pipe is fitted and fixed to the recess. The bottom plate is formed with an opening at a position facing the gap member,
3. The outdoor unit for an air conditioner according to claim 1, wherein the gap member is formed with a protrusion that fits into the opening on the bottom plate side. 4. The gap member is an insulating material,
The outdoor unit for an air conditioner according to any one of claims 1 to 3, wherein the lowermost pipe and the bottom plate are different types of metals. The lowermost pipe is aluminum or an alloy containing aluminum,
The outdoor unit of an air conditioner according to claim 4, wherein the bottom plate is iron. The lowermost pipe is a flat pipe,
The outdoor unit of the air conditioner according to any one of claims 1 to 5, wherein a direction of a long axis of the flat tube is arranged in parallel with a surface of the bottom plate. A method of manufacturing an outdoor unit of an air conditioner comprising a heat exchanger having a plurality of pipes, and a bottom plate,
A step of fitting a gap member formed with a U-shaped concave section into a lowermost pipe disposed at the lower end of the heat exchanger among the plurality of pipes and fixing the gap member;
A step of fitting a protrusion formed on the bottom plate side of the gap member into an opening of the bottom plate and positioning the heat exchanger on the bottom plate;
The manufacturing method of the outdoor unit of the air conditioner characterized by having.

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