JP2003279073A - Outdoor unit of air conditioner - Google Patents

Abstract

(57) [Summary] An outdoor unit of a small, high-performance, and inexpensive air conditioner is provided. A unit body provided with a suction port and an air outlet, and a plurality of plate-shaped heat transfer fins housed in the unit body and superimposed at predetermined intervals on a heat transfer tube are stacked in a plurality of stages. In an outdoor unit of an air conditioner having a partially curved heat exchanger, an electric fan that blows the heat exchanger, and a bell mouth provided around the outlet,
The heat exchanger includes split fins divided at least in part for each heat exchanger section, and the inner step section is provided such that a step section is provided between the inner-stage heat exchanger section and the outer-stage heat exchanger section. An end plate having a substantially L-shaped cross section is attached to the end of the inner heat exchanger section so as to be shorter and closer to the bell mouth from the heat exchanger section toward the outer heat exchanger section. An outdoor unit of an air conditioner, characterized in that:

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outdoor unit of an air conditioner, and more particularly to an outdoor unit of an air conditioner in which an end plate having a substantially L-shaped cross section is attached to an end of an inner stage heat exchanger section. .

[0002]

2. Description of the Related Art As shown in FIG. 10, an outdoor unit 21 of a conventional air conditioner has a plurality of plate-shaped heat transfer fins 23 superposed on a heat transfer tube 22 and having a predetermined gap. The outer stage heat exchanger portion 2 of the heat exchanger 24, a part of which is curved
4c is screwed to the bottom plate 27 of the unit body 26 via the short end plate 25.

Therefore, in the outdoor unit 21 of the conventional air conditioner, the innermost heat exchanger portion 24b and the bell mouth 28 are prevented from interfering with each other by the variation of the bending for bending the heat exchanger 24, so that the innermost heat is prevented. Exchanger part 24c and bell mouth 2
I had no choice but to make a big gap with 8. As a means for increasing the gap g, a method of reducing the diameter of the fan 29 or widening the width of the heat exchanger has been used. However, the former has a problem that the performance is deteriorated, and the latter has a problem that the outdoor unit 21 of the air conditioner becomes large in size and expensive, and there is no suitable means in either case. Further, when the short end plate 25 is attached to the outer stage heat exchanger portion 24c, the U-shaped portion 22b of the heat transfer tube 22 in which part of the blown air is exposed at the end portion of the innermost heat exchanger portion 24b is used. A short circuit that flows back through occurs, and the heat exchange performance of the step portion 24a was not maximized.

Further, in the outdoor unit of the conventional air conditioner, as shown in FIG. 11, the outer stage heat exchanger portion 24c expands outward due to the springback during bending, so that the inner stage heat exchanger portion is expanded. There is a problem that a gap g ₁ is formed between 24 b and the heat exchange efficiency is lowered. Further, in order to prevent springback, it is necessary to separately provide a stopper for locking, which causes a problem of cost increase.

[0005]

Therefore, there is a demand for an outdoor unit for an air conditioner that is small in size, high in performance, and inexpensive.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a small-sized outdoor unit for an air conditioner with high performance.

[0007]

In order to achieve the above object, according to one aspect of the present invention, a unit main body provided with a suction port and a blow-out port, and a unit body housed in the unit main body and fixed to a heat transfer tube. A heat exchanger with a large number of plate-shaped heat transfer fins superposed at intervals and stacked in a plurality of stages, a part of which is curved, an electric fan for blowing air to the heat exchanger, and provided around the air outlet. In an outdoor unit of an air conditioner having a bell mouth, the heat exchanger includes at least a part thereof divided fins for each heat exchanger part, and an inner stage heat exchanger part and an outer stage are formed. The inner stage heat exchanger part is formed to be shorter toward the outer stage heat exchanger part so that a step portion is provided between the heat exchanger parts, and a cross section is formed at an end of the inner stage heat exchanger part. Has a substantially L-shaped end plate close to the bell mouth Outdoor unit of an air conditioner is provided, characterized in that attached to the earthenware pots. As a result, a compact, high-performance, inexpensive outdoor unit for an air conditioner is realized.

In a preferred example, the end plate has a cutout portion for preventing contact with the bell mouth.

As a result, the diameter of the fan can be increased while keeping the gap between the arc portion of the bell mouth and the end plate, the air volume can be increased at the same noise level, and the heat exchange performance can be improved.

In another preferable example, the end plate is
On the other side, which is orthogonal to the one side facing the heat transfer fins, there is a hole corresponding to the space between the surface on the one side and the U-shaped portion of the heat transfer tube. As a result, the U-shaped portion and the open end of the heat transfer tube can be held and fixed to perform the tube expansion work, and the length contraction of the heat transfer tube at the time of tube expansion can be reduced.

In another preferred example, the end plate is
The plate thickness is 0.5 mm or more. Thus, even if the outdoor unit of the air conditioner is dropped during transportation, the end plate will not be deformed.

In another preferable example, the outermost heat exchanger section is pressed against an engaging projection provided on the bottom plate of the unit body. As a result, springback of the outer heat exchanger part is suppressed, formation of a gap with the inner heat exchanger part is prevented, and heat exchange efficiency can be improved.
There is no need to provide a separate stopper for locking.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION A first embodiment of an outdoor unit for an air conditioner according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a sectional view of a first embodiment of an outdoor unit of an air conditioner according to the present invention, and FIG. 2 is a partially enlarged perspective view of FIG.

As shown in FIGS. 1 and 2, an outdoor unit 1 of an air conditioner has a unit body 2 provided with a suction port 2a and a blowout port 2b, and a transmission unit in which the refrigerant flows so that a refrigerant flows. A heat exchanger 5 in which a large number of plate-shaped heat transfer fins 4 superposed at predetermined intervals are superposed on the heat pipe 3 and a part of which is curved, and an electric fan 6 for blowing air to the heat exchanger 5. , And a bell mouth 7 provided around the air outlet 2b.

As shown in FIG. 2, in the heat exchanger 5, the step portion 5a has an inner stage heat exchanger portion 5b and an outer stage heat exchanger portion 5b.
It is formed so as to be shorter between the inner stage heat exchanger portion 5b and the outer stage heat exchanger portion 5c so as to be provided between c and the end plate 8 is provided at the end portion 5b ₁ of the inner stage heat exchanger portion 5b. Installed. Further, the large number of plate-shaped heat transfer fins 4 superposed on the heat transfer tubes 3 are at least partly formed, for example, all of them are divided fins for each row of the heat transfer tubes and are composed of superposed split fins. The inner stage heat exchanger portion 5b and the outer stage heat exchanger portion 5c are in a state of being divided over the entire length.

In the above heat exchanger, the inner heat exchanger portion and the outer heat exchanger portion do not necessarily have to be divided over the entire length, but a part of the heat exchanger is composed of split fins, and the rest is It may be a combination type heat exchanger including integral fins integrally polymerized with the heat transfer tubes of the inner heat exchanger part and the outer heat exchanger part.

As shown in FIG. 3, the end plate 8 has a plate thickness t of 0.5 mm or more, a substantially L-shaped cross section and an angled shape, and has an L-shape facing the heat transfer fins 4. A plurality of insertion holes 8a ₁ into which the heat transfer tubes 3 of the inner stage heat exchanger portion 5b are inserted are formed on one side, and the other side orthogonal to the one side is connected to the surface on the one side. A plurality of elliptical elongated holes 8a2 are bored corresponding to the space of the U-shaped portion 3a of the heat pipe 3, and a mounting screw hole 8b is bored in the lower end portion on the other side. A portion 8c is provided. By setting the thickness of the end plate 8 to 0.5 mm or more, even if the outdoor unit 1 of the air conditioner is dropped during transportation, the end plate will not be deformed. If the plate thickness is smaller than 0.5 mm, the end plate is deformed when dropped.

Further, as shown in FIG. 4, the end plate 8 is screwed to the rising portion 2c ₁ of the bottom plate 2c of the unit main body 2 by a screw 9 penetrating the mounting screw hole 8b. Thereby, even if there is variation in the bending of the inner stage heat exchanger portion 5b, the end plate 8 can reliably fix the inner stage heat exchanger portion 5b at a predetermined position. Also, the inner stage heat exchanger portion 5b
Prior to bending, the outer heat exchanger portion 5c allows the heat transfer tube 3 and the heat transfer fin 4 to be tightly fixed to each other by expanding the heat transfer tube 3. This expansion is fixed by the U-shaped part 3 of the heat transfer tube (U-shaped tube)
A mechanical tube expanding method is preferred in which the bottom part (hairpin part) and the tube opening end are held and fixed, and a tube expanding mandrel is inserted from the tube opening to expand the tube. This mechanical tube expanding method can reduce the shrinkage of the length of the heat transfer tube 3 after expanding, and can achieve high quality and cost reduction.

Conventionally, if an end plate is provided on the side of the U-shaped portion 3b of the heat transfer tube 3, it is difficult to hold and fix the U-shaped portion 3b at the time of expanding the tube. Therefore, the expansion of the length of the heat transfer tube 3 is small. Was difficult to adopt, but it becomes possible by providing the long hole 8a ₂ on the other side of the end plate 8 as described above. Long hole 8a
_The shape of ₂ is not limited to an elliptical shape, and may be any shape.

As shown in FIG. 2 and FIG. 5, since the end plate 8 is interposed between the inner stage heat exchanger portion 5b and the bell mouth 7 provided around the blowout port 2b, the end plate 8 is close to the end plate 8. The inner stage heat exchanger portion 5b arranged in such a manner does not interfere with the bell mouth 7. Further, since the end plate 8 and the bell mouth 7 are provided close to each other to form a substantially sealed state, the U of the inner stage heat exchanger portion 5b is blown from the outlet 2b.
A short circuit that flows backward to the vicinity of the U-shaped portion 3c of the character portion 3b and the outer stage heat exchanger portion 5c is prevented, and the vicinity of the step portion 5a formed between the inner stage heat exchanger portion 5b and the outer stage heat exchanger portion 5c. The heat exchange performance of can be maximized.

Reference numeral 10 is a compressor for compressing the refrigerant, and in this embodiment, it is housed in the unit main body 2 and
Although it forms an outdoor unit, the outdoor unit of the air conditioner according to the present invention may have the compressor housed in the unit body or installed outside the unit body.

Next, heat exchange of the outdoor unit of the air conditioner according to the present invention will be described.

As shown in FIGS. 1 and 2, the air sucked from the suction port 2a by the action of the electric fan 6 exchanges heat with the heat exchanger 5 and is blown out of the unit body 2 from the blowout port 2b. In this heat exchange process, the suction port 2a and the step portion 5a become negative pressure due to the action of the electric fan 6, but the air flow is provided with the end plate 8 close to the bell mouth 7 to form a substantially sealed state. Therefore, unlike the conventional case, there is no occurrence of a short circuit in which the backflow flows from the air outlet to the vicinity of the U-shaped portion of the heat exchanger, and the backflow from the air outlet to the vicinity of the U-shaped portion of the heat exchanger is prevented. Therefore, the heat exchange performance in the vicinity of the step portion 5a can be maximized.

The effect of the present invention is not limited to two rows of heat exchangers, and can be expected in a plurality of rows such as three rows or four rows.

A second embodiment of the outdoor unit of the air conditioner according to the present invention will be described.

In the second embodiment, the end plate used in the first embodiment has an end plate formed with a cutout portion for accommodating the bell mouth end part.

For example, as shown in FIG. 6, the end plate 8A is
A plurality of insertion holes 8Aa ₁ into which the heat transfer tubes 3 of the inner stage heat exchanger portion 5b are inserted on one side of the L-shape facing the heat transfer fins 4.
Is drilled, and on the other side that is orthogonal to this one side,
A plurality of long holes 8Aa ₂ is provided, at the central portion is formed bell mouth end housing notches 8Ad trapezoidal, further mounting collision of mounting screw holes 8Ab is bored at the lower end The section 8Ac is provided.

Therefore, as shown in FIGS. 6 to 8, the diameter of the fan 6A can be increased while keeping the gap 11A between the arcuate portion of the bell mouth 7A and the end plate 8A, which is substantially circular, by the notch portion 8Ad. As a result, the air volume at the same noise level is increased and the heat exchange performance can be improved. The cutout portion is not limited to the trapezoidal shape, and may have any shape as long as it can avoid interference with the arc portion of the bell mouth.

Since the other structure is not different from the outdoor unit of the air conditioner shown in FIG. 1, the same reference numerals are given and the description thereof will be omitted.

A third embodiment of the outdoor unit of the air conditioner according to the present invention will be described.

In the third embodiment, the outer stage heat exchanger part of the first embodiment is arranged parallel to the flat rising part of the bottom plate, while the outer stage heat exchanger part is engaged. It is designed to be pressed against the rising portion provided with a stop projection.

For example, as shown in FIG. 9, a locking protrusion 2Ba _{2 is} provided on a rising portion 2Ba 1 of a bottom plate 2Ba of the unit body 2B.
Is provided, and the heat exchanger 5 is attached to the locking protrusion 2Ba _2.
The outer stage heat exchanger portion 5Bc of B is in contact. Therefore,
Even if the outer stage heat exchanger section 5Bc tries to expand outward due to springback during bending, its movement is suppressed, and it is possible to prevent a gap from being formed between the outer stage heat exchanger section 5Bc and the inner stage heat exchanger section 5Bb. The heat exchange efficiency can be improved. Moreover, since it is not necessary to separately provide a stopper for locking, the cost can be reduced.

[0034]

EXAMPLE An outdoor unit for an air conditioner according to the present invention is used, and the end plates used for the outdoor unit have a thickness of 0.3 to 0.8 m.
A drop test was conducted by changing the distance to m up to every 0.1 mm, and the presence or absence of deformation of the end plate was investigated.

Results: Shown in Table 1.

[0036]

[Table 1]

To eliminate the deformation of the end plate when dropped, 0.5
It was found that a plate thickness of mm or more is necessary.

[0038]

According to the outdoor unit for an air conditioner of the present invention, it is possible to provide a compact, high-performance, inexpensive outdoor unit for an air conditioner.

[Brief description of drawings]

FIG. 1 is a sectional view of a first embodiment of an outdoor unit of an air conditioner according to the present invention.

FIG. 2 is an enlarged perspective view showing a portion A of FIG.

FIG. 3 is a perspective view of an end plate used in the first embodiment of the outdoor unit of the air conditioner according to the present invention.

FIG. 4 is a perspective view showing an attached state of an end plate used in the first embodiment of the outdoor unit of the air conditioner according to the present invention.

5 is a cross-sectional view showing an enlarged part A of FIG.

FIG. 6 is a perspective view of an end plate used in a second embodiment of an outdoor unit for an air conditioner according to the present invention.

FIG. 7 is an enlarged perspective view showing an end plate portion of an outdoor unit for an air conditioner according to a second embodiment of the present invention.

FIG. 8 is a conceptual diagram showing a part of an end plate of a second embodiment of an outdoor unit for an air conditioner according to the present invention.

FIG. 9 is an enlarged sectional view showing the vicinity of an end plate of a third embodiment of the outdoor unit for an air-conditioning apparatus according to the present invention.

FIG. 10 is a conceptual diagram of an outdoor unit of a conventional air conditioner.

FIG. 11 is a conceptual diagram of an outdoor unit of a conventional air conditioner.

[Explanation of symbols]

1 Outdoor unit of air conditioner 2 unit body 2a Suction port 2b outlet 2c bottom plate 2c1 rising 3 heat transfer tubes 3a U-shaped part 3b U-shaped part 4 Plate-shaped heat transfer fins 5 heat exchanger 5a step 5b Inner stage heat exchanger section 5c Outer stage heat exchanger section 5c1 end 6 heat exchange electric fan 7 Bellmouth 8 end plates 8a insertion hole 8b Mounting screw hole 8c Mounting protrusion 9 screws 10 compressor

Claims (5)

[Claims] 1. A unit main body having a suction port and an outlet, and a large number of plate-shaped heat transfer fins housed in the unit main body and superposed at predetermined intervals on a heat transfer tube in a plurality of stages. In an outdoor unit of an air conditioner having a heat exchanger whose part is curved, an electric fan that blows air to the heat exchanger, and a bell mouth provided around the air outlet, the heat exchanger, At least a part of the heat exchanger includes split fins for each heat exchanger section, and the inner heat exchanger section is provided with a stepped portion between the inner heat exchanger section and the outer heat exchanger section. An end plate having a substantially L-shaped cross section is attached to the end of the inner stage heat exchanger so as to be close to the bell mouth. The outdoor unit of the air conditioner. 2. The outdoor unit for an air conditioner according to claim 1, wherein the end plate has a cutout portion for preventing contact with a bell mouth. 3. The outdoor unit for an air conditioner according to claim 1, wherein the end plate is connected to a surface of the one side on the other side orthogonal to the one side facing the heat transfer fins. An outdoor unit for an air conditioner, which has holes corresponding to the spaces between the U-shaped portions of the heat pipes. 4. The outdoor unit for an air conditioner according to claim 1, wherein the end plate has a plate thickness of 0.5 mm or more. Outdoor unit. 5. The outdoor unit for an air conditioner according to claim 1, wherein the outermost-stage heat exchanger section is pressed against an engagement protrusion provided on a bottom plate of the unit body. The outdoor unit of the characteristic air conditioner.