JP2011064338A - Air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner improved in wind speed distribution and achieved in compatibility between both the improvement of energy saving performance and reduction in noise. <P>SOLUTION: The air conditioner includes: a casing having an air suction port and an air blowout port; an air fan provided in the casing; and an approximately inverted V-shaped indoor heat exchanger having fins and heat transfer tubes penetrating the fins and arranged to surround the air fan. The indoor heat exchanger includes a front face side indoor heat exchanger and a back face side indoor heat exchanger. The front face side indoor heat exchanger includes two linear parts and a curved part with both ends connected to the two linear parts, and an arrangement interval of the heat transfer tubes in the curved part is set smaller than that in the linear part. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an air conditioner provided with an indoor heat exchanger.

  As a conventional air conditioner, there is one that includes an indoor heat exchanger that includes a front heat exchanger and a rear heat exchanger (see, for example, Patent Document 1 (FIGS. 1 and 3)). The front heat exchanger described in Patent Document 1 is configured to bend in the fan direction by three straight portions and two curved portions.

  The basic characteristics of the air flow passing through the heat exchanger having such a curved portion will be described with reference to FIG. FIG. 7 shows the air flow when the resistor 37 having a uniform internal air resistance is placed in a uniform air flow. As shown in FIG. 7, the resistor has two straight portions and a curved portion having both ends connected to the two straight portions. The thick arrows in FIG. 7 indicate air flow lines, and the thin arrow group 39 indicates the flow velocity distribution of the air flow downstream of the resistor.

  The air flowing from the left passes through the resistor 37 and flows to the right. In general, air has a property of flowing in a shortest path from a high pressure to a low pressure. Therefore, in the upper part of the resistor 37 having a right-up shape, the air flow that is directed rightward in the upstream of the resistor 37 becomes a right-down flow in the resistor 37, and this air flow passes through the resistor 37. After that, since it goes further downstream, it becomes the original rightward flow. Similarly, in the lower part of the resistor 37 having a right-down shape, the air flow that is directed to the right upstream of the resistor 37 becomes a right-up flow, and after the air flow passes through the resistor 37, the air flow is further increased. Since it goes downstream, it becomes the original rightward flow.

  Thus, the flow direction changes between the upper part and the lower part of the resistor 37, so that the flow is concentrated in the central part 38 of the resistor 37, and the flow is accelerated. That is, the distribution of the wind speed passing through the resistor 37 becomes non-uniform. If the same phenomenon occurs in the heat exchanger, the amount of heat exchanged may be reduced due to non-uniform wind speed distribution, or the non-uniform wind speed distribution may act on the downstream fan to increase noise. There is sex.

JP 2006-250366 A

  It is an object of the present invention to provide an air conditioner that improves wind speed distribution and achieves both energy saving and noise reduction.

  In order to solve the above problems, an air conditioner according to the present invention has a housing having an air inlet and an air outlet, a blower fan provided in the housing, a fin and a heat transfer tube penetrating the fin. A substantially inverted V-shaped indoor heat exchanger disposed so as to surround the blower fan, and the indoor heat exchanger includes a front side indoor heat exchanger and a back side indoor heat exchanger, the front side The indoor heat exchanger has two straight portions and a curved portion in which both ends are connected to the two straight portions, and the arrangement interval of the heat transfer tubes in the curved portion is smaller than the arrangement interval of the heat transfer tubes in the linear portion.

  According to the present invention, it is possible to provide an air conditioner that improves the wind speed distribution and achieves both improved energy saving and noise reduction.

The figure which shows arrangement | positioning of the heat exchanger tube of a front side indoor heat exchanger. The figure which shows the structure of a refrigerating cycle. The figure which shows the structure of a cross fin tube type heat exchanger. The figure which shows the cross section of an indoor unit. The figure which shows the shape of a front side indoor heat exchanger. The figure which shows arrangement | positioning of the heat exchanger tube of a front side indoor heat exchanger. The figure which shows the airflow which passes the resistor which has a bending part.

  Embodiments of the present invention will be described below with reference to the drawings.

  A first embodiment according to the present invention will be described with reference to FIGS. First, a basic configuration of the air conditioner according to the present embodiment will be described. FIG. 2 is a configuration diagram of the refrigeration cycle. The air conditioner according to the present embodiment functions when the outdoor unit 1 and the indoor unit 7 are connected by the connection pipe 10. The outdoor unit 1 includes a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, a throttle device 6, and a propeller fan 5. The indoor unit 7 includes an indoor heat exchanger 8 and a blower fan. A cross-flow fan 9 can be used as the blower fan.

  Next, the operation of each component during cooling operation will be described first. The high-pressure gaseous refrigerant compressed by the compressor 2 is condensed by dissipating heat to the outside air in the outdoor heat exchanger 4, and becomes a high-pressure liquid refrigerant. This liquid refrigerant is depressurized by the action of the expansion device 6, becomes a low-temperature low-pressure gas-liquid two-phase state, and flows to the indoor unit 7 through the connection pipe 10. The refrigerant that has entered the indoor unit 7 is evaporated by absorbing the heat of the indoor air in the indoor heat exchanger 8. The refrigerant evaporated in the indoor unit returns to the outdoor unit 1 through the connection pipe 10 and is compressed again by the compressor 2 through the four-way valve 3.

  In the heating operation, the refrigerant flow path is switched by the four-way valve 3, and the high-pressure gaseous refrigerant compressed by the compressor 2 flows to the indoor unit 7 through the four-way valve 3 and the connection pipe 10. The refrigerant that has entered the indoor unit 7 is condensed by dissipating heat to the indoor air in the indoor heat exchanger 8, and becomes a high-pressure liquid refrigerant. This liquid refrigerant flows into the outdoor unit 1 through the connection pipe 10. The liquid refrigerant that has entered the outdoor unit 1 is depressurized by the action of the expansion device 6 and enters a low-temperature low-pressure gas-liquid two-phase state. The low-temperature and low-pressure gas-liquid two-phase refrigerant flows into the outdoor heat exchanger 4 and evaporates by absorbing the heat of the outdoor air to become a gaseous refrigerant. This gaseous refrigerant passes through the four-way valve 3 and is compressed again by the compressor 2.

  FIG. 3 shows the structure of a cross fin tube type heat exchanger. This heat exchanger is configured such that a plurality of aluminum fins 11 are penetrated by U-shaped copper heat transfer tubes 12. By expanding the heat transfer tube 12 inserted into the fins hydraulically or mechanically, the fin 11 and the heat transfer tube 12 are brought into close contact with each other. Further, a joint part 13 is welded to the end of the heat transfer tube 12 to form a refrigerant flow path.

  FIG. 4 is a sectional view of the indoor unit of the air conditioner (cross section perpendicular to the axis of the heat transfer tube). An air suction port (specifically, a front air suction port 22 on the front surface of the housing and a top air suction port 23 on the top surface of the housing) is provided above the housing, and an air outlet is disposed below the housing. 24 is provided. A cross-flow fan 9 is disposed in the housing, and a cross-fin tube type heat exchanger is disposed in the middle of the air path from the air suction port to the cross-flow fan. The indoor heat exchanger 8 includes a front side indoor heat exchanger 20 and a back side indoor heat exchanger 21. The front-side indoor heat exchanger 20 and the back-side indoor heat exchanger 21 are arranged in a substantially inverted V shape so as to surround the cross-flow fan 9. When the cross-flow fan 9 is operated, the room air flows in from the air suction port, exchanges heat with the internal refrigerant in the indoor heat exchanger 8, and blows out from the air outlet 24, thereby air-conditioning the room air.

  Next, the details of the cross-sectional shape of the front-side indoor heat exchanger 20 will be described with reference to FIG. At the windward leading edge of the front side indoor heat exchanger 20, the leading edge side straight portion 25 and the leading edge side straight portion 26 are connected by a leading edge side curved portion 28, and the leading edge side straight portion 26 and the leading edge side straight portion 27 are connected. It is connected by the leading edge side curved portion 29. Further, at the leeward trailing edge of the front side indoor heat exchanger 20, the trailing edge side straight portion 30 and the trailing edge side straight portion 31 are connected by the trailing edge side curved portion 33, and the trailing edge side straight portion 31 and the trailing edge side straight portion 32 are connected. Are connected by the curved portion 34 on the trailing edge side. With such a configuration, the front-side indoor heat exchanger is formed to be curved toward the cross-flow fan 9.

  The shaded portion on the upper side of FIG. 5 shows a heat exchanger curved portion 35 surrounded by a leading edge side curved portion 28 of the windward leading edge and a trailing edge side curved portion 33 of the leeward trailing edge. Further, the shaded portion on the lower side of FIG. 5 shows a heat exchanger curved portion 36 surrounded by a leading edge side curved portion 29 of the windward leading edge and a trailing edge side curved portion 34 of the leeward trailing edge. The portions not shaded include a heat exchanger straight line 50 surrounded by a leading edge side straight part 25 of the windward leading edge and a trailing edge side straight part 30 of the leeward trailing edge, and a leading edge side straight part 26 of the windward leading edge. And the heat exchanger straight line 51 surrounded by the trailing edge side straight part 31 of the leeward trailing edge, the heat surrounded by the leading edge side straight part 27 of the windward leading edge and the trailing edge side straight part 32 of the leading edge side leeward trailing edge. This is the exchanger straight section 52. Here, both ends of the heat exchanger curve portion 35 are connected to the heat exchanger straight portion 50 and the heat exchanger straight portion 51, and both ends of the heat exchanger curve portion 36 are connected to the heat exchanger straight portion 51 and the heat exchanger straight portion. 52. As described with reference to FIG. 7, the heat exchanger curve portions 35 and 36 are more easily accelerated in air flow than the heat exchanger linear portions 50, 51 and 52.

Next, arrangement | positioning of the heat exchanger tube in the cross section of the front side indoor heat exchanger 20 of a present Example is demonstrated using FIG. In the front-side indoor heat exchanger 20, three rows of heat transfer tubes are arranged in the air flow direction, and twelve stages are arranged in a direction perpendicular to the air flow direction. The broken line in a figure shows the part bent in the U shape of the inserted heat exchanger tube. Here, L0 indicates the arrangement interval of the heat transfer tubes in the heat exchanger linear portion. L1 and L2 indicate the arrangement interval of the smallest heat transfer tubes among the arrangement intervals of the heat transfer tubes in the heat exchanger curve portion 35 and the heat exchanger curve portion 36. In the present embodiment, the relationship between L0, L1, and L2 is as follows.
L1 <L0
L2 <L0
That is, the arrangement interval of the heat transfer tubes in the heat exchanger curve portions 35 and 36 in which air is easily accelerated is narrower than the arrangement interval of the heat transfer tubes in the heat exchanger linear portions 50, 51 and 52, and the heat exchanger curve portions are relatively. Since the ventilation resistance in 35 and 36 becomes large, acceleration of the airflow in the heat exchanger curve portions 35 and 36 can be suppressed. That is, nonuniformity in the wind speed distribution of the air passing through the heat exchanger can be reduced, and both energy saving and noise reduction can be achieved.

  Increasing the ventilation resistance of the heat exchanger curved portions 35 and 36 can be realized by reducing the arrangement interval of the heat transfer tubes in any row from the first row to the third row. By the way, when air is cooled during cooling and moisture in the air condenses and condensation occurs on the fins of the heat exchanger, the air with the highest humidity passes through the first row, so that A lot of condensed water adheres to the fins of the eyes. When condensed water adheres to the fins, the portion through which air can pass decreases, so the ventilation resistance increases. That is, when the ventilation resistance is increased by reducing the arrangement interval of the tubes, it is more effective to reduce the arrangement interval of the heat transfer tubes in the first windward as in this embodiment. .

  In the present embodiment, the heat transfer tube arrangement interval in the heat exchanger curve portions 35, 36 is made smaller than the heat transfer tube arrangement interval in the heat exchanger linear portions 50, 51, 52 so that the air is easily accelerated. By suppressing the acceleration of the air flow in the heat exchanger curve portions 35 and 36, nonuniformity in the wind speed distribution of the air passing through the heat exchanger was reduced. However, the present invention is not limited to an indoor heat exchanger having a heat exchanger linear part and a heat exchanger curved part as in the present embodiment, but only a heat exchanger curved part without a heat exchanger linear part. Even in the case where the curvature of the heat exchanger curve portion is changed, a region where air is easily accelerated is generated, and the wind speed distribution of the air passing through the indoor heat exchanger becomes non-uniform. It is also effective in some cases. In such a case, what is necessary is just to make the arrangement | positioning space | interval of the heat exchanger tube in the part with a larger curvature of a front surface side heat exchanger smaller than the arrangement | positioning space | interval of the heat exchanger tube in the part with a smaller curvature of a front surface side heat exchanger. By reducing the arrangement interval of the heat transfer tubes in the portion where the curvature of the front side heat exchanger is larger than the arrangement interval of the heat transfer tubes in the portion where the curvature is smaller, the air flow in the portion where the curvature is easy to be accelerated is reduced. Since acceleration can be prevented, the nonuniformity of the wind speed distribution of the air passing through the heat exchanger can be reduced.

  As described with reference to FIG. 3, the cross fin tube type heat exchanger uses a U-shaped bent heat transfer tube. Therefore, in order to vary the arrangement interval of the heat transfer tubes, the U-shaped It is necessary to make the bending radii of the heat transfer tubes bent differently (that is, it is necessary to prepare a plurality of types of heat transfer tubes). However, in this embodiment, the arrangement interval between adjacent heat transfer tubes of the two U-shaped heat transfer tubes is reduced (that is, the adjacent U-shaped heat transfer tubes are set to L0, L1, and L2. Therefore, the heat exchanger can be configured with only one type of U-shaped heat transfer tube without requiring a plurality of types of heat transfer tubes.

  A second embodiment according to the present invention will be described with reference to FIG. Since the basic configuration of the air conditioner according to the present embodiment is the same as that of the first embodiment, detailed description thereof will be omitted, and only differences will be described.

FIG. 6 shows the arrangement of the heat transfer tubes of the front side indoor heat exchanger in the present embodiment. In the front side indoor heat exchanger in the present embodiment, three rows of heat transfer tubes are arranged in the air flow direction, and twelve stages are arranged in a direction perpendicular to the air flow direction. The broken line in a figure shows the part bent in the U shape of the inserted heat exchanger tube. Here, L0 indicates the arrangement interval of the heat transfer tubes in the heat exchanger linear portion. L1 and L2 indicate the arrangement interval of the smallest heat transfer tubes among the arrangement intervals of the heat transfer tubes in the heat exchanger curve portion 35 and the heat exchanger curve portion 36. In the present embodiment, the relationship between L0, L1, and L2 is as in the following equation, as in the first embodiment.
L1 <L0
L2 <L0
That is, the arrangement interval of the heat transfer tubes in the heat exchanger curve portions 35 and 36 in which air is easily accelerated is narrower than the arrangement interval of the heat transfer tubes in the heat exchanger linear portions 50, 51 and 52, and the heat exchanger curve portions are relatively. Since the ventilation resistance in 35 and 36 becomes large, acceleration of the airflow in the heat exchanger curve portions 35 and 36 can be suppressed. That is, nonuniformity in the wind speed distribution of the air passing through the heat exchanger can be reduced, and both energy saving and noise reduction can be achieved.

  Here, in the first embodiment, the portion bent in the U shape of the heat transfer tube (the broken line portion shown in FIG. 6) does not exist in the portion where the heat transfer tube arrangement interval is small. However, in the present embodiment, the portion bent in the U shape of the heat transfer tube (the broken line portion shown in FIG. 6) exists in the portion where the arrangement interval of the heat transfer tubes is small. That is, the arrangement interval of the heat transfer tubes is reduced by using the heat transfer tubes 40 whose U-shaped portion has a smaller bending radius than other heat transfer tubes.

DESCRIPTION OF SYMBOLS 1 Outdoor unit 2 Compressor 3 Four-way valve 4 Outdoor heat exchanger 5 Propeller fan 6 Throttle device 7 Indoor unit 8 Indoor heat exchanger 9 Cross-flow fan 10 Connection pipe 11 Fin 12 Heat transfer tube 13 Joint part 14 Indoor unit back side housing 15 Indoor unit front side housing 16 Indoor unit front panel 17 Wind direction control plate 18 Indoor unit upper front case 19 Pre-filter frame 20 Front side indoor heat exchanger 21 Rear side indoor heat exchanger 22 Front air inlet 23 Upper surface air suction Port 24 Air outlet 25, 26, 27 Leading edge side straight part 28, 29 Leading edge side curved part 30, 31, 32 Trailing edge side straight part 33, 34 Trailing edge side curved part 35, 36 Heat exchanger curve part 37 Resistor 38 Resistance Body center portion 39 Thin arrow group 40 Heat transfer tubes 50, 51, 52 where the bending radius of the U-shaped portion is small Heat exchanger linear portion

Claims (5)

A housing having an air inlet and an air outlet;
A blower fan provided in the housing;
A substantially reverse V-shaped indoor heat exchanger having fins and heat transfer tubes penetrating the fins and arranged to surround the blower fan,
The indoor heat exchanger has a front side indoor heat exchanger and a back side indoor heat exchanger,
The front-side indoor heat exchanger has two straight portions and curved portions whose both ends are connected to the two straight portions,
The air conditioner characterized in that an arrangement interval of the heat transfer tubes in the curved portion is smaller than an arrangement interval of the heat transfer tubes in the linear portion.   2. The air conditioner according to claim 1, wherein an arrangement interval of the heat transfer tubes in the windward row in the curved portion is smaller than an arrangement interval of the heat transfer tubes in the linear portion. A housing having an air inlet and an air outlet;
A blower fan provided in the housing;
A substantially reverse V-shaped indoor heat exchanger having fins and heat transfer tubes penetrating the fins and arranged to surround the blower fan,
The indoor heat exchanger has a front side indoor heat exchanger and a back side indoor heat exchanger,
The front-side indoor heat exchanger is formed so as to bend in the direction of the blower fan,
The air is characterized in that an arrangement interval of the heat transfer tubes in a portion where the curvature of the front side indoor heat exchanger is large is smaller than an arrangement interval of the heat transfer tubes in a portion where the curvature of the front side indoor heat exchanger is smaller. Harmony machine.   4. The arrangement interval of the heat transfer tubes in a portion where the curvature of the front side indoor heat exchanger is smaller than the arrangement interval of the heat transfer tubes in the windward upper row in the portion where the curvature of the front side indoor heat exchanger is large. Air conditioner characterized by being smaller than.   The indoor heat exchanger according to any one of claims 1 to 4, wherein the indoor heat exchanger is a cross fin tube type indoor heat exchanger configured by a plurality of heat transfer tubes bent in a U shape, and is bent in the U shape. An air conditioner characterized in that the bending radii of the heat transfer tubes are all equal.

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