KR20110030302A - Air conditioner - Google Patents

Abstract

PURPOSE: An air conditioner is provided to reduce noise and to improve energy saving efficiency by improving wind velocity distribution. CONSTITUTION: An air conditioner comprises a housing, a blowing fan, and an indoor heat exchanger(8). The housing comprises an air inlet and an air outlet. The blowing fan is installed inside the housing. The indoor heat exchanger is arranged to cover the blowing fan and has fins and a heat exchange tubes(10). The heat exchange tubes pass through the fins.

Description

Air conditioner {AIR CONDITIONER}

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

Some conventional air conditioners include an indoor heat exchanger composed of a front side heat exchanger and a rear side heat exchanger (see, for example, Patent Document 1 (FIGS. 1 and 3)). The front side heat exchanger of patent document 1 is comprised so that it may be curved in a fan direction by three linear parts and two curved parts.

The basic characteristic of the flow of air passing through the heat exchanger which has such a curved part is demonstrated using FIG. FIG. 7 shows the flow of air in the case where the resistor 37 having a uniform internal air resistance is placed in a uniform air flow. As shown in FIG. 7, the resistor has a curved portion in which two straight portions and both ends are connected to the two straight portions. The thick arrow in FIG. 7 shows the streamline of air, and the thin arrow group 39 shows the flow velocity distribution of the air flow downstream of a resistor.

Air flowing from the left side flows through the resistor 37 to the right side. In general, air has the property of flowing from the high pressure to the low to take the shortest path. Therefore, in the upper portion of the resistor 37 having the right-side up shape, the air flow that is in the right direction upstream of the resistor 37 becomes a flow that descends to the right in the resistor 37, and the air flow is the resistor ( After passing through 37), it is also directed downstream, so that the flow is in the original right direction. Similarly, in the lower portion of the resistor 37 having the right downward shape, the air flow in the right direction upstream of the resistor 37 becomes a flow rising to the right, and after the air flow passes through the resistor 37, And also downstream, so that the flow is in the original right direction.

Thus, since the direction of flow changes in the upper part and the lower part of the resistor 37, in the center part 38 of the resistor 37, it becomes the axial flow which a flow concentrates, and flow accelerates. That is, the distribution of the wind speed passing through the resistor 37 becomes uneven. If the same phenomenon occurs in the heat exchanger, the amount of exchange heat decreases due to the unevenness of the wind speed distribution, or the uneven wind speed distribution may act on the fan on the downstream side to increase the noise.

[Patent Document 1] Japanese Patent Application Laid-Open No. 2006-250366

An object of the present invention is to provide an air conditioner which improves the distribution of wind speeds and achieves both an energy saving improvement and quietness.

In order to solve the said subject, the air conditioner which concerns on this invention has a housing which has an air intake port and an air blower outlet, the blower fan provided in the housing, and the heat exchanger tube which penetrates a fan and a fin, and is arrange | positioned so that it may surround the blower fan. A V-shaped indoor heat exchanger is provided, and the indoor heat exchanger has a front side heat exchanger and a rear side indoor heat exchanger, and the front side heat exchanger has a curved portion in which two straight portions and both ends are connected to two straight portions. The spacing of heat transfer tubes in the curved portion is smaller than the spacing of heat transfer tubes in the straight portion.

According to the present invention, the air conditioner can be improved to provide an air conditioner that can achieve both energy saving and quietness.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the arrangement | positioning of the heat exchanger tube of a front side side indoor heat exchanger.
2 is a diagram illustrating a configuration of a refrigeration cycle.
3 shows the structure of a cross fin tubular heat exchanger;
4 is a diagram showing a cross section of the indoor unit;
Fig. 5 is a diagram showing the shape of the front surface side indoor heat exchanger;
Fig. 6 is a diagram showing the arrangement of heat transfer tubes of the front side heat exchanger.
FIG. 7 is a view showing an air flow passing through a resistor having a bent portion; FIG.

Best Mode for Carrying Out the Invention Embodiments of the present invention will be described below using the drawings.

(First embodiment)

A first embodiment of the present invention will be described with reference to Figs. 1 to 5 and 7. First, the basic configuration of the air conditioner according to the present embodiment will be described. 2 is a block diagram of a refrigeration cycle. The air conditioner according to the present embodiment functions by connecting the outdoor unit 1 and the indoor unit 7 by the connecting pipe 10. The outdoor unit 1 includes a compressor 2, a four-way valve 3, an outdoor heat exchanger 4, an orifice device 6, and a propeller fan 5. The indoor unit 7 includes an indoor heat exchanger 8 and a blowing fan. In addition, the blowing fan 9 can be used as a blowing fan.

Next, the effect | action of each component at the time of cooling operation is demonstrated first. The high-pressure gaseous refrigerant compressed by the compressor 2 is condensed by radiating heat to the outside air by the outdoor heat exchanger 4 to form a high-pressure liquid refrigerant. The liquid refrigerant is depressurized by the action of the orifice device 6 to form a gas-liquid two-phase state of low temperature and low pressure, and flows to the indoor unit 7 through the connection pipe 10. The refrigerant entering the indoor unit 7 evaporates by absorbing heat of indoor air by the indoor heat exchanger 8. The refrigerant generated in the indoor unit is returned to the outdoor unit 1 through the connecting pipe 10 and is compressed back to the compressor 2 through the four-way valve 3.

In the case of 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 is passed through the four-way valve 3 and the connecting pipe 10 to the indoor unit 7. Flows). The refrigerant entering the indoor unit 7 is condensed by radiating heat into the indoor air by the indoor heat exchanger 8 to form a high pressure liquid refrigerant. This liquid refrigerant flows to the outdoor unit 1 through the connection pipe 10. The liquid refrigerant entering the outdoor unit 1 is reduced in pressure by the action of the orifice device 6, and the gas-liquid two-phase state of low temperature and low pressure is reduced. The refrigerant in a low-temperature, low-pressure gas-liquid two-phase state flows to the outdoor heat exchanger 4, and evaporates by absorbing heat of outdoor air, thereby becoming a gaseous refrigerant. This gaseous refrigerant is compressed back to the compressor 2 via a four-way valve 3.

3 shows the structure of a cross fin tubular heat exchanger. This heat exchanger is comprised so that the copper heat exchanger tube 12 bent in a U shape may penetrate the some fin 11 made from aluminum. The fin 11 and the heat transfer tube 12 closely contact each other by hydraulically or mechanically expanding the heat transfer tube 12 inserted into the fin. Moreover, the joint part 13 is welded to the edge part of the heat exchanger tube 12, and the flow path of a refrigerant | coolant is comprised.

4 is a cross-sectional view (cross section perpendicular to the axis of the heat pipe) of the indoor unit of the air conditioner. An air inlet (specifically, a front air inlet 22 and an upper air inlet 23 on the upper surface of the housing) is formed above the housing. An air blower outlet 24 is formed below the housing. A perfusion fan 9 is arranged in the housing, and a cross fin tube heat exchanger is arranged in the middle of the air path from the air intake port to the perfusion fan. The indoor heat exchanger 8 is composed of a front side indoor heat exchanger 20 and a back side indoor heat exchanger 21. In addition, the front side indoor heat exchanger 20 and the rear side indoor heat exchanger 21 are arranged in a substantially inverted V shape so as to surround the perfusion fan 9. When the perfusion fan 9 is operated, indoor air flows in from the air intake port, heat exchanges with the internal refrigerant in the indoor heat exchanger 8, and blows it out from the air blower outlet 24, thereby air conditioning the indoor air.

Next, the detail of the cross-sectional shape of the front surface side indoor heat exchanger 20 is demonstrated using FIG. In the upstream front corner of the front side indoor heat exchanger 20, the front edge side straight portion 25 and the front edge side straight portion 26 are connected by the front edge side curved portion 28, and the front edge side straight line. The portion 26 and the front corner side straight portion 27 are connected by the front corner side curved portion 29. Further, in the downstream rear corner portion of the front side indoor heat exchanger 20, the rear corner side straight portion 30 and the rear corner side straight portion 31 are connected by the rear corner side curved portion 33, and the rear edge. The side straight portion 31 and the rear corner straight portion 32 are connected by the rear corner curved portion 34. By such a configuration, the front surface side indoor heat exchanger is formed to be curved in the direction of the perfusion fan 9.

The upper hatched portion in FIG. 5 shows the heat exchanger curve 35 surrounded by the front edge side curved portion 28 of the upstream front edge and the rear edge side curved portion 33 of the downstream rear edge. Further, the lower hatched portion in FIG. 5 shows the heat exchanger curve 36 surrounded by the front edge side curved portion 29 of the upstream front edge and the rear edge side curved portion 34 of the downstream rear edge. The part which the net is not shown by hatching is the heat exchanger straight part 50 surrounded by the front edge side straight part 25 of an upstream front edge, and the rear edge side straight part 30 of a downstream rear edge, and the front edge side of an upstream front edge. Heat exchanger straight part 51 surrounded by the straight part 26 and the rear edge side straight part 31 of the downstream rear edge, the front edge side straight part 27 of the upstream front edge, and the rear edge of the downstream rear edge The heat exchanger straight portion 52 surrounded by the side straight portion 32. Here, both ends of the heat exchanger curve part 35 are connected to the heat exchanger straight part 50 and the heat exchanger straight part 51, and both ends of the heat exchanger curve part 36 are the heat exchanger straight part 51 and the heat exchanger. It is connected to the linear part 52 previously. As described with reference to FIG. 7, the heat exchanger curved portions 35 and 36 are more likely to accelerate the flow of air than the heat exchanger straight portions 50, 51 and 52.

Next, arrangement | positioning of the heat exchanger tube in the cross section of the front surface side indoor heat exchanger 20 of a present Example is demonstrated using FIG. In the front surface side heat exchanger 20, three rows of heat transfer tubes are arranged in the air flow direction, and 12 steps are arranged in the direction perpendicular to the air flow direction. The broken line in the figure shows a portion bent in a U shape of the inserted heat pipe. L0 is an arrangement | positioning space of the heat exchanger tube in a heat exchanger linear part here. L1 and L2 represent an arrangement interval of the smallest heat transfer tube among the arrangement intervals of the heat transfer tubes in the heat exchanger curve portion 35 and the heat exchanger curve portion 36. In this embodiment, the relationship between L0, L1, and L2 is as follows.

L1 <L0

L2 <L0

That is, the arrangement intervals of the heat transfer tubes in the heat exchanger curve portions 35 and 36 that are easily accelerated by air are narrower than the arrangement intervals of the heat transfer tubes in the heat exchanger curve portions 50, 51 and 52, and thus the heat exchanger curves are relatively small. Since the ventilation resistance in the sections 35 and 36 becomes large, acceleration of the air flow in the heat exchanger curve sections 35 and 36 can be suppressed. That is, the nonuniformity of the wind speed distribution of the air passing through the heat exchanger can be reduced, so that the shape of the energy saving property and the silence can be compatible.

In order to increase the ventilation resistance of the heat exchanger curve parts 35 and 36, it can implement | achieve by making small the space | interval of the heat exchanger tube of arbitrary rows of 1st row | paragraph 3rd row. By the way, when the air is cooled during condensation and moisture in the air condenses, and condensation occurs on the fins of the heat exchanger, the air having the highest humidity passes through the first row, so that the first row of fins Condensation water is attached. When the condensation water adheres to the pins, the portion through which air can pass decreases, thereby increasing the ventilation resistance. In other words, 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 of the first row that is the most upstream as in the present embodiment.

In this embodiment, the arrangement intervals of the heat transfer tubes in the heat exchanger curved sections 35 and 36 are made smaller than the arrangement intervals of the heat transfer tubes in the heat exchanger straight sections 50, 51, and 52, and the air accelerates. By suppressing the acceleration of the air flow in the heat exchanger curved sections 35 and 36, which are likely to occur, the variation in the wind speed distribution of the air passing through the heat exchanger is reduced. However, the present invention is not limited to the heat exchanger straight portion and the heat exchanger curved portion as well as the indoor heat exchanger having the heat exchanger straight portion as in the present embodiment. By changing the curvature in the air, an area where air tends to be accelerated is generated, which is also effective when the wind speed distribution of the air passing through the indoor heat exchanger becomes uneven. In such a case, the arrangement interval of the heat transfer tubes in the portion where the curvature of the front side heat exchanger is larger may be smaller than the arrangement intervals of the heat transfer tube in the portion where the curvature of the front side heat exchanger is smaller. Acceleration of the air flow in the portion where the curvature which is easy to accelerate air is smaller by making the arrangement | positioning space of a heat exchanger tube in the part with a larger curvature of a front side heat exchanger smaller than the arrangement | positioning interval of a heat exchanger tube in a part with a lower curvature. Since it can prevent, the nonuniformity of the wind speed distribution of the air passing through a heat exchanger can be reduced.

In addition, as described with reference to FIG. 3, since the heat exchanger tube bent in a U shape is used for the heat exchanger of the cross fin tube type, it is necessary to change the bending radius of the heat exchanger tube bent in the U shape in order to change the arrangement interval of the heat transfer tube. (Ie, it is necessary to prepare a plurality of types of heat pipes). However, in the present embodiment, a plurality of types of heat transfer tubes are arranged by reducing the arrangement interval of neighboring heat transfer tubes among two U-shaped heat transfer tubes (that is, adjusting the adjacent U-shaped heat transfer tubes to be L0, L1, L2). The heat exchanger can be comprised only by one type of U-shaped heat exchanger tube, without requiring this.

(2nd Example)

A second embodiment of 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 the differences will be described.

Fig. 6 shows the arrangement of heat transfer tubes of the front surface side indoor heat exchanger in this embodiment. In the front surface side indoor heat exchanger in this embodiment, three rows of heat transfer tubes are arranged in the air flow direction, and are arranged in 12 stages in a direction perpendicular to the air flow direction. The broken line in the figure shows a portion bent in a U shape of the inserted heat pipe. L0 is an arrangement | positioning space of the heat exchanger tube in a heat exchanger linear part here. L1 and L2 represent an arrangement interval of the smallest heat transfer tube among the arrangement intervals of the heat transfer tubes in the heat exchanger curve portion 35 and the heat exchanger curve portion 36. In this embodiment, the relationship between L0, L1, and L2 is the same as that of the first embodiment as follows.

L1 <L0

L2 <L0

That is, the arrangement intervals of the heat transfer tubes in the heat exchanger curve portions 35 and 36 that are easily accelerated by air are narrower than the arrangement intervals of the heat transfer tubes in the heat exchanger straight portions 50, 51 and 52, and thus the heat exchanger curves are relatively small. Since the ventilation resistance in the sections 35 and 36 becomes large, acceleration of the air flow in the heat exchanger curve sections 35 and 36 can be suppressed. That is, the nonuniformity of the wind speed distribution of the air passing through the heat exchanger can be reduced, and the improvement of energy saving property and the quietness can be made compatible.

Here, in the first embodiment, the portion (broken line portion shown in Fig. 6) curved in the U-shape of the heat transfer tube does not exist in the portion where the arrangement interval of the heat transfer tube is small. However, in this embodiment, the part (broken part shown in FIG. 6) bent in the U-shape of a heat exchanger tube exists in the part with a small space | interval of arrangement | positioning of a heat exchanger tube. That is, by using the heat exchanger tube 40 whose curve radius of a U-shaped part is smaller than other heat exchanger tubes, the arrangement | interval space of a heat exchanger tube is made small.

1: outdoor unit
2: compressor
3: 4-way valve
4: outdoor heat exchanger
5: propeller fan
6: orifice device
7: indoor unit
8: indoor heat exchanger
9: perfusion fan
10: connection piping
11: pin
12: heat pipe
13: joint parts
14: indoor unit rear side housing
15: indoor unit front side housing
16: indoor unit front panel
17: Wind direction control panel
18: indoor unit upper front side housing
19: frame of pre filter
20: front side indoor heat exchanger
21: rear side indoor heat exchanger
22: front air intake
23: top air intake
24: air outlet
25, 26, 27: front edge side straight part
28, 29: front edge side curved portion
30, 31, 32: straight edge side
33, 34: rear corner side curved portion
35, 36: curve of heat exchanger
37: resistor
38: center portion of the resistor
39: thin arrow group
40: heat transfer tube with small U-shaped curve radius
50, 51, 52: heat exchanger straight part

Claims (5)

A housing having an air inlet and an air outlet,
A blowing fan installed in the housing;
An indoor heat exchanger having a fin and a heat pipe passing through the fin, wherein the indoor heat exchanger has a substantially inverted V shape arranged to surround the blowing 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 connected at both ends thereof to the two straight portions,
The arrangement | positioning space of the said heat exchanger tube in the said curved part is smaller than the arrangement | positioning interval of the said heat exchanger tube in the said straight part, The air conditioner characterized by the above-mentioned. The air conditioner according to claim 1, wherein an arrangement interval of the heat transfer tubes of the most upstream heat in the curved portion is smaller than an arrangement interval of the heat transfer tubes in the straight portion. A housing having an air inlet and an air outlet,
A blowing fan installed in the housing;
An indoor heat exchanger having a fin and a heat pipe passing through the fin, wherein the indoor heat exchanger has a substantially inverted V shape arranged to surround the blowing 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 to be curved in the direction of the blowing fan,
The arrangement | positioning interval of the said heat exchanger tube in the part with a large curvature of the said front surface side indoor heat exchanger is smaller than the arrangement | positioning interval of the said heat exchanger tube in the part where the curvature of the front side side indoor heat exchanger is smaller, Air conditioner. The space | interval of arrangement | positioning of the said heat exchanger tube in the part in which the arrangement | positioning space of the uppermost heat | fever heat transfer tube in the part with a large curvature of the said front surface side indoor heat exchanger is smaller. Air conditioner characterized by a 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 constituted by a plurality of heat transfer tubes bent in a U shape, and all bending radii of the heat transfer tube bent in the U shape are all. Air conditioner, characterized in equality.

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