JP2005291694A - Air conditioner indoor unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce a problem that an air conditioner having only an upper suction port cannot obtain a sufficient wind speed by a lower heat exchanger and a fan input becomes large.
SOLUTION: In an air conditioner that is an upper suction port, a large number of plate-like fins 1 that are arranged in parallel and through which air flows are inserted into the plate-like fins 1 at right angles, and a working fluid passes through the inside. The heat exchanger 4 is provided with a plurality of heat transfer tubes 2 provided in a step direction perpendicular to the air passage direction, and the heat exchanger 4 arranged so as to surround the cross-flow fan 5 is a front lower heat exchanger 4a and a front upper heat exchange. It manufactured separately with the heat exchanger 4b and the back surface heat exchanger 4c, and made the air side pressure loss of the front lower heat exchanger 4a smaller than other heat exchangers.
[Selection] Figure 1

Description

  The present invention relates to an indoor unit of an air conditioner using a finned tube heat exchanger for exchanging heat between fluids such as air.

A conventional air conditioner having a finned tube heat exchanger has a grill that sucks air at the top and front, and the heat exchanger used for the indoor unit eliminates a part of the cut-up and the heat exchanger When used as an evaporator, there is an attempt to improve drainage of condensed water (for example, see Patent Document 1).
In addition, the cut and raised provided on the plate-like fins is only on one side of the front and back of the plate-like fins in the first row from the windward side, and the second row is on both sides, and the heat exchange capacity is reduced while eliminating the decrease in ventilation resistance. It is intended to improve (see Patent Document 2).
Japanese Patent Laid-Open No. 11-183077 (page 3, FIG. 1, FIG. 2) JP 2000-179993 A (page 3, FIGS. 1 and 2)

In the conventional air conditioner disclosed in Patent Document 1, the dew condensation water from the upper heat exchanger does not collect at the upper end of the fins of the lower heat exchanger, and flows down between the fins to the lower dew receiving unit. The fin surface at the uppermost front part of the exchanger is not cut up and raised, and the air conditioner of Patent Document 1 has two suction ports, but in the air conditioner with only the upper suction port, the lower heat exchanger However, a sufficient wind speed cannot be obtained, resulting in a problem that the fan input becomes large.
Moreover, when the fin of the heat exchanger of patent document 2 is similarly used for the heat exchanger of an air conditioner with a suction port only at the upper part, in the lower heat exchanger, by cutting and raising the first and second rows, There is a problem that sufficient wind speed cannot be obtained, and the fan input becomes large. Moreover, since the cut and raised are on both sides in the second row, when air flows into the blower after leaving the heat exchanger, there is a problem in that the blades in the blower cause separation and increase the blower input. .

The present invention has been made in order to solve the above problems, and has a heat exchanger that can obtain a sufficient wind speed, prevents an increase in blower input, and has a good heat transfer performance. It aims at providing the indoor unit of an air conditioner.
Moreover, it aims at providing the indoor unit of the air conditioner using the heat exchanger which is excellent also in an assembly property.

  An indoor unit of an air conditioner according to the present invention includes a suction port, a plurality of finned-tube heat exchangers in which plate-like fins are stacked and a heat transfer tube is penetrated, a blower, an air flow passage, and an outlet. The plurality of fin tube heat exchangers are arranged so as to surround the blower, and the suction from the air pressure loss of the heat exchanger arranged on the suction port side among the plurality of fin tube heat exchangers The air pressure loss of the heat exchanger arranged further away from the heat exchanger on the suction port side with respect to the mouth is reduced.

  In the indoor unit of the air conditioner according to the present invention, the heat disposed further away from the heat exchanger on the suction port side with respect to the suction port than the air pressure loss of the heat exchanger disposed on the suction port side. Since the air pressure loss of the exchanger has been reduced, the heat exchanger located away from the suction port can also obtain sufficient air speed, prevent the fan input from becoming large, and heat with good heat exchanger heat transfer performance An exchanger can be provided.

Embodiment 1 FIG.
1 is a cross-sectional view showing an indoor unit of an air conditioner using a heat exchanger according to Embodiment 1 of the present invention, and FIG. 2 is a diagram showing a flow of air in the indoor unit of FIG. FIG. 3 is a characteristic diagram showing characteristics of pressure loss and air volume of the blower of the indoor unit of FIG.
In these drawings, the indoor unit of the air conditioner of the present embodiment includes an air inlet 7 of the upper grille, and a heat exchanger 4 arranged so as to surround the once-through fan 5 on the upstream side of the air flow. , The upper grill, the heat exchanger 4, the air flow path 6 formed by a casing for guiding the air that has passed through the once-through blower 5 to the outlet 17, the condensate receiver 19 below the heat exchanger 4, and the front panel 8 and the like. Therefore, the air flow of the indoor unit is mainly sucked from above and blown out forward in the lower part.

The heat exchanger 4 is a front lower heat exchanger 4a installed substantially vertically at the lower front part of the indoor unit, the front upper part, the upper grill side to the lower front lower heat exchanger 4a side, and the upper part rearward. The front upper heat exchanger 4b installed with the lower part inclined slightly forward and the rear heat exchange installed with the upper part forward and the lower part inclined slightly rearward from the upper grill side to the lower indoor unit. 4c, which are arranged so as to surround the once-through fan 5.
The heat exchanger 4 is a finned tube heat exchanger composed of laminated plate-like fins 1 and heat transfer tubes 2 inserted perpendicularly to the plate-like fins 1, and the lamination direction of the plate-like fins 1. The pitch Fp of Fp is 0.0011 m, the fin thickness Ft is Ft = 0.0001 m, and the fin width in the long axis direction of the flat tube is L = 0.0254 m. The front wind speed Uf (average wind speed of the entire heat exchanger) of the heat exchanger is Uf = 1.0 m / s, and the distance Dp between the centers of the heat transfer tubes adjacent in the stage direction of the heat exchanger is Dp = 0. 0254 m.
The plate-like fins 1 of the front lower heat exchanger 4a have a flat shape without the cut and raised 3 provided. The front upper heat exchanger 4b and the rear heat exchanger 4c are provided with a plurality of trapezoidal cuts 33 on the plate-like fin 1, and both the heat exchangers 4b and 4c have the same shape and are manufactured on the same production line. . Further, the rear heat exchanger 4c has a part of the outer shape processed to form a portion 21 where the plate-like fins 1 are tilted, and is placed in the rear guider.
The front lower heat exchanger 4a, the front upper heat exchanger 4b, and the rear heat exchanger 4c are configured as separate bodies without all the heat exchangers 4 being joined, and each heat exchanger 4a, 4b, 4c The slit pattern can be easily changed.

In FIG. 2, the air flow in the heat exchanger 4 is mainly shown in the direction of air flow in the front lower heat exchanger 4a (indicated by arrows). A once-through vortex 9 is generated in the once-through fan 5 by the air flow of the front lower heat exchanger 4a.
Since the front panel 8 does not allow air to pass therethrough, if the front lower heat exchanger 4a is cut and raised like the front upper heat exchanger 4b and the rear heat exchanger 4c and the entire surface 3 is provided, the front lower heat exchange is performed. The wind speed in the vicinity of the heat exchanger 4a is very small compared to the wind speed in the vicinity of the front upper heat exchanger 4b and the rear heat exchanger 4c.
For this reason, in this Embodiment, it was set as the form which does not cut and raise 3 in the front lower heat exchanger 4a. That is, of the plurality of fin tube heat exchangers 4a, 4b, and 4c, the air pressure loss of the heat exchangers 4b and 4c disposed on the suction port 7 side causes the suction port 7 side to be closer to the suction port 7 side. The air pressure loss of the heat exchanger 4a arranged further away from the heat exchangers 4b and 4c was reduced. Therefore, the pressure loss on the air side of the front lower heat exchanger 4a is lower than that of the front upper heat exchanger 4b and the rear heat exchanger 4c, the local wind speed at the lower part of the heat exchanger is increased, and the inside of the once-through fan 5 The turbulence intensity around the vortex increases. At this time, the static pressure in the vortex is lowered and the efficiency of the blower is improved.
In this way, the front panel 8 does not allow air to pass, and the suction port is the air suction port 7 of the upper grill, and the front lower heat exchanger 4a is cut and raised so that 3 is not provided. Compared to the case where there is a suction port, the front surface is cleaner by design, noise can be eliminated, and the heat exchanger located away from the suction port can also obtain sufficient wind speed, increasing the fan input. Prevent heat exchanger heat transfer performance.

FIG. 3 is a characteristic diagram showing the characteristics of pressure loss ΔP and air volume Ga at the same rotational speed of the blower. Here, the solid line 10a is a fan characteristic when the front lower heat exchanger 4a is cut and raised 3 and the broken line 10b is a fan characteristic when the front lower heat exchanger 4a is not raised and 3 is provided, a solid line 11a is a heat exchanger pressure loss characteristic when the front lower heat exchanger 4a is cut and raised 3, and a broken line 11b is a heat exchanger pressure loss when the front lower heat exchanger 4a is not raised and 3 is provided. Show properties.
The black circle 12a is a unit operating point when the front lower heat exchanger 4a is cut and raised 3 and the white circle 12b is the unit operating point when the front lower heat exchanger 4a is not cut and raised 3.
When the front lower heat exchanger 4 a is not provided with the cut and raised 3, the pressure loss of the front lower heat exchanger 4 a is lower than when the cut and raised 3 is provided. Further, the blower characteristic moves to the side where the pressure loss is larger. Thus, since the unit operating point is moved from 12a to 12b, the air volume Ga increases at the same rotational speed. That is, the air volume Ga increases when the cut-up 3 is not provided.
Moreover, the rotational torque in the once-through blower 5 can be stabilized, and the backflow of the air upstream and downstream of the blower hardly occurs.
Moreover, when used as an evaporator, when the front lower heat exchanger 4a is not provided with the cut and raised 3, the drainage of the condensed water adhering to the plate-like fin 1 compared to the case where the cut and raised 3 is provided. Performance is improved and pressure loss is reduced.

  If the front lower heat exchanger 4a is not provided with the uplift 3, the same air volume will be lower than when the uplift 3 is provided, but the air volume will increase significantly when compared with the same speed, and heat exchange Ability increases.

  In the heat exchanger of the present embodiment, the front upper heat exchanger 4b and the rear heat exchanger 4c are manufactured to have the same shape, and the plate-like fins of the portion that are in contact with the rear guider 18 of the rear heat exchanger 4c in post-processing. 1 is formed, the number of production lines can be reduced and the production cost can be greatly reduced as compared to the case where the front upper heat exchanger 4b and the rear heat exchanger 4c are produced in different shapes.

  FIG. 4 shows the front upper heat disposed on the suction port 7 side on the upstream side in the air inflow direction of the auxiliary heat exchangers 4d and 4e that are not cut and raised in the heat exchanger 4 of the first embodiment. It is provided in the exchanger 4b and the back heat exchanger 4c. In this case as well, the heat exchanger 4 has the same effect as the heat exchanger of FIG. 1 and the capacity of the heat exchanger 4 is improved by the auxiliary heat exchangers 4d and 4e.

  FIG. 5 shows the auxiliary heat exchangers 4d and 4e shown in FIG. Also in this case, the heat exchanger 4 has the same effect as that of the heat exchanger 4 in FIG. 1, and the capacity of the heat exchanger 4 is further improved by the auxiliary heat exchangers 4d and 4e with the cut and raised portions 3.

FIG. 6 shows only the lowermost portion 3 in the row direction (the row direction is indicated by an arrow) of the lowermost end portion (the lowest end portion in the gravity direction indicated by the arrow g) of the plate-like fin 1 of the lower front heat exchanger 4a. The rest is made flat. Since the wind speed of the most downstream part of the lower part of a heat exchanger can be increased, the same effect as the heat exchanger 4 of FIG. 1 can be exhibited.
Further, when the cut-and-raised part 3 is not left in the most downstream portion, a vortex with a slow flow velocity is formed in the wake of the heat transfer tube 2 in the air flow direction, causing deterioration in heat transfer performance and noise value in the once-through fan 5. However, it is possible to prevent them by leaving the cut and raised 3 in the most downstream portion.

7 is a cross-sectional view of the indoor unit similar to FIG. 1, and FIGS. 8A, 8B, and 8C are cross-sectional views taken along line AA of the heat exchanger 4 in FIG. -B line sectional drawing, CC line sectional drawing. This indoor unit is the same as the indoor unit of FIG. 1 except that the front lower heat exchanger 4a is also cut and raised 3, and the fin pitch ha between the plate-like fins 1 is changed to the front lower heat exchange in order to reduce the air pressure loss. The fin pitches hb and hc of the plate-like fins 1 of the heat exchanger 4b and the back heat exchanger 4c are larger.
By doing in this way, the pressure loss at the time of an air flow passing the front lower heat exchanger 4a becomes smaller than the front lower heat exchanger 4b and the back heat exchanger 4c, and passes the front lower heat exchanger 4a. Wind speed increases. Therefore, the same effect as the heat exchanger of FIG. 1 can be produced.

9A, 9B, and 9C are respectively a cross-sectional view taken along line AA, a cross-sectional view taken along line BB, and a cross-sectional view taken along line CC in FIG. It is.
In this indoor unit, in order to reduce the air pressure loss of the front lower heat exchanger 4a, the height Sa of the cut and raised 3 provided in the plate-like fin 1 of the front lower heat exchanger 4a is set to the front lower heat exchanger. 4b and the plate-like fins 1 of the back heat exchanger 4c are made smaller than the heights Sb and Sc of the cut-and-raised 3 provided respectively. Others are the same as FIG.
In this indoor unit, the plate-like fins 1 of the front lower heat exchanger 4a, the front lower heat exchanger 4b, and the rear heat exchanger 4c are cut and raised 3, and are provided on the plate fins 1 of the front lower heat exchanger 4a. Since the height Sa of the cut and raised 3 is smaller than the height Sa and Sc of the cut and raised 3 provided on the plate-like fins 1 of the lower front heat exchanger 4b and the rear heat exchanger 4c, the air flow is reduced to the front. The pressure loss when passing through the lower heat exchanger 4a is smaller than that of the front lower heat exchanger 4b and the rear heat exchanger 4c, and the wind speed passing through the front lower heat exchanger 4a is increased. Therefore, the same effect as the heat exchanger form of FIG. 1 can be produced.
In addition, regarding the plate-like fin 1, if both countermeasures described in FIGS. 8 and 9 are taken, the wind speed passing through the front lower heat exchanger 4a increases.

10 is a cross-sectional view showing the indoor unit, FIG. 11 is a cross-sectional view taken along line AA of the heat exchanger 4 in FIG. 10, and FIGS. 10 (a), 10 (b), and 10 (c). It is a BB line sectional view and a CC line sectional view.
The heat exchanger 4 of the present indoor unit is the one in which the countermeasure for the plate-like fin 1 of FIG. 8 is taken in the heat exchanger 4 of the indoor unit of FIG.
The heat exchanger 4 of this indoor unit has a flat bottom shape with the cut-and-raised 3 of the lowermost plate-like fin 1 of the front lower heat exchanger 4a remaining in the row pitch direction, and the other is a flat lower heat exchanger. 4b, the plate-like fin 1 of the back heat exchanger 4c is cut and raised 3, and the pitch ha of the plate-like fin 1 of the front lower heat exchanger 4a is set to the plate shape of the front lower heat exchanger 4b and the back heat exchanger 4c. The pitches hb and hc of the fin 1 are larger. By doing in this way, the pressure loss at the time of an air flow passing the front lower heat exchanger 4a becomes smaller than the front lower heat exchanger 4b and the back heat exchanger 4c, and the wind speed which passes the back heat exchanger 4a Will increase. Therefore, the same effect as the heat exchanger form of FIG. 1 can be produced.

FIG. 12 shows the heat exchanger 4 of the indoor unit of FIG. 1, in which the front lower heat exchanger 4a is cut and raised 3 like the other heat exchangers 4b and 4c, and the auxiliary heat exchanger 4f It arrange | positions in the air flow upstream of the lower heat exchanger 4a, and provided the clearance gap 20 through which air passes between the front panel 8 and the condensed water receiver 19. FIG.
By providing the auxiliary heat exchanger 4f, the pressure loss at the lower part of the front surface increases, but by providing a gap 20 through which air passes between the front panel 8 and the condensate receiver 19, only air flowing from the upper grille is provided. Instead, air flows in from the gap 20 and the wind speed at the lower part of the front surface increases. Therefore, the same effect as the heat exchanger form of FIG. 1 can be produced.

  FIG. 13 shows a configuration in which the auxiliary heat exchanger 4e is arranged on the upstream side of the air flow of the rear heat exchanger 4c in the form of the heat exchanger 4 of FIG. Also in this case, the same effect as that of the heat exchanger 4 shown in FIG. 12 can be obtained. Further, the front panel 8 has a structure in which the upper air inlet 7 side is inclined and opened at a predetermined angle. When the front panel 8 is opened as shown in FIG. 14, the wind speed of the lower heat exchanger 4a is similarly increased.

  FIG. 15 shows the configuration of the heat exchanger 4 of FIG. 12 in which the auxiliary heat exchanger 4f is not disposed in the front lower heat exchanger 4a, and only the auxiliary heat exchanger 4e is disposed upstream of the air flow in the rear heat exchanger 4c. It is installed. Also in this case, the wind speed of the lower front heat exchanger 4a is further increased, and the same effect as that of the heat exchanger 4 in FIG. 12 can be obtained.

  FIG. 16 shows the cut-and-raised part 3 of the plate-like fin 1 that is closest to the blower 5 in the heat exchanger 4 of the indoor unit of FIG. The angle of the cut and raised 3 is a parallelogram having an angle of θ in the downward direction with respect to the column direction, and the other cut and raised 3 is trapezoidal.

As shown in FIG. 17 (a), if all the cut-and-raised parts 3 of the front lower heat exchanger 4a have a conventional trapezoidal shape, the air flow after exiting the front lower heat exchanger 4a flows to the once-through fan 5. Since it goes straight in the row direction, a separation vortex 14 is generated on the pressure surface in the once-through fan 5, and the fan input deteriorates.
On the other hand, as shown in the flow in the blades of the blower 5 in FIG. 17B, the cut-and-raised 3 of the plate-like fin 1 in the portion closest to the blower 5 of the front lower heat exchanger 4a is formed. Only in the most downstream part in the row direction, the angle of the cut and raised 3 is a parallelogram having an angle of θ downward with respect to the row direction, so that the air flow after leaving the front lower heat exchanger 4a is the once-through fan 5 On the other hand, it flows downward and generally follows the angle of attack of the blades in the once-through fan 5, so that the separation vortex 14 does not occur on the pressure surface and the fan input is improved.

FIG. 18A is a partial cross-sectional view showing the vicinity of the joint between the upper part of the front upper heat exchanger 4b and the rear heat exchanger 4c of the conventional indoor unit, and has a grill that allows air to pass through the front of the indoor unit. 1 shows a conventional heat exchanger.
As described above, in the heat exchanger 4 of the conventional indoor unit, the front upper heat exchanger 4b and the rear heat exchanger 4c are in line contact, and the air flow is concentrated in the vicinity of the joint and passes through the heat exchanger. In many cases, the sealing material 16 that prevents air from passing through the joint portion is used so as to prevent the air from being lost. In this case, since the air flow completely bypasses the sealing portion, the heat transfer area is reduced. It could be reduced, pressure loss increased, and fan input could increase.

As shown in FIG. 18B, the joint 17 at the upper part of the front upper heat exchanger 4b and the rear heat exchanger 4c of this indoor unit is connected to the end face 35 of the front upper heat exchanger 4b and the rear heat exchanger 4c. Since the air flow is in surface contact with the side surface, the air flow also passes through the heat exchangers 4b and 4c in the vicinity of the joint, so that the pressure loss is smaller than that of the conventional heat exchanger and the heat transfer area is not impaired.
Further, in this indoor unit, a panel 8 that does not allow air to pass through the front is used, and a grill is used that allows the wind speed near the joint between the front upper heat exchanger 4b and the rear heat exchanger 4c to pass air to the front. Compared to the case of using a grill that allows air to pass through the front surface, the above-described effect increases.
In addition, formation of the junction part of the upper part of the front upper heat exchanger 4b and the back surface heat exchanger 4c like this can be applied together with the configuration (measure) for reducing the air pressure loss of the front lower heat exchanger 4a. .

  The indoor unit of the air conditioner according to the present embodiment further includes a front upper heat exchanger 4b and a rear heat exchanger 4c, which are heat exchangers arranged on the suction port 7 side, and a heat exchanger on the suction port 7 side. Since all the lower front heat exchangers 4a, which are heat exchangers arranged separately, are manufactured separately, it is easy to change the slit patterns of the heat exchangers 4a, 4b, 4c.

  Further, in the indoor unit of the air conditioner of the present embodiment, the main air inflow direction is from above, a large number of them are arranged in parallel, and the plate fins 1 in which air flows between each, and the plate fins 1 is inserted at a right angle, the working fluid (refrigerant) passes through the inside, the heat transfer pipe 2 provided in a plurality of stages in a step direction perpendicular to the air passage direction, a once-through fan 5, and the once-through fan 5 are surrounded. The heat exchanger 4 includes a plurality of heat exchangers 4 arranged in the manner described above, and each of the heat exchangers 4 is manufactured separately, and includes a front lower heat exchanger 4a at the lower front, a front upper heat exchanger 4b at the upper front, and an upper rear. In addition, since the air-side pressure loss of the lower front heat exchanger 4a is smaller than that of the upper front heat exchanger 4b and the rear heat exchanger 4c, the heat exchange efficiency is high and the pressure is reduced. Low loss and good assembly The air conditioner of the indoor unit.

  Further, in the indoor unit of the air conditioner of the present embodiment, the main air inflow direction is from above, a large number of them are arranged in parallel, and the plate fins 1 in which air flows between each, and the plate fins 1 is inserted at a right angle, the working fluid (refrigerant) passes through the inside, the heat transfer pipe 2 provided in a plurality of stages in a step direction perpendicular to the air passage direction, a once-through fan 5, and the once-through fan 5 are surrounded. The heat exchanger 4 includes a plurality of heat exchangers 4 arranged in the manner described above, and each of the heat exchangers 4 is manufactured separately, and includes a front lower heat exchanger 4a at the lower front, a front upper heat exchanger 4b at the upper front, and an upper rear. Further, the auxiliary heat exchanger 4f is disposed upstream of the front lower heat exchanger 4a in the air flow direction, and air passes between a part of the front panel 8 and the condensed water receiver 19. Since the gap 20 is provided, the heat exchange efficiency is improved. Ku, the pressure loss is small, the input of the once-through blower is small, the assembling of good indoor unit of an air conditioner.

  Further, in the indoor unit of the air conditioner of the present embodiment, the main air inflow direction is from above, a large number of them are arranged in parallel, and the plate fins 1 in which air flows between each, and the plate fins 1 is inserted at a right angle, the working fluid (refrigerant) passes through the inside, the heat transfer pipe 2 provided in a plurality of stages in a step direction perpendicular to the air passage direction, a once-through fan 5, and the once-through fan 5 are surrounded. A plurality of heat exchangers 4 arranged in such a manner that each of the heat exchangers 4 is manufactured individually, the front lower heat exchanger 4a at the lower front, the front upper heat exchanger 4b at the upper front and the upper rear Further, the front upper heat exchanger 4b and the rear heat exchanger 4c have the same shape, and the joint 17 at the upper part of the front upper heat exchanger 4b and the rear heat exchanger 4c is in surface contact. Seal material to prevent air leakage Because we do not have the heat exchange efficiency is high, the pressure loss is reduced, and the assembling of good indoor unit of an air conditioner.

Embodiment 2. FIG.
FIG. 19 is a refrigerant circuit diagram illustrating a refrigerant circuit of an air conditioner that uses the heat exchanger according to the second embodiment.
The refrigerant circuit shown in the figure includes a compressor 26, a condensing heat exchanger 27, an expansion device 28, an evaporating heat exchanger 29, and a blower 30. By using the heat exchanger according to Embodiment 1 in the above-described embodiment for the condensation heat exchanger 27, the evaporating heat exchanger 29, or both, an air conditioner with high energy efficiency can be realized.
Here, energy efficiency is constituted by the following equation.
Heating energy efficiency = indoor heat exchanger (condenser) capacity / all inputs Cooling energy efficiency = indoor heat exchanger (evaporator) capacity / all inputs

  In addition, about the heat exchanger 4 described in the above-mentioned Embodiment 1 and Embodiment 2 and the air conditioner using the same, HCFC (R22) and HFC (R116, R125, R134a, R14, R143a, R152a, R227ea, R23, R236ea, R236fa, R245ca, R245fa, R32, R41, RC318, etc., and several mixed refrigerants R407A, R407B, R407C, R407D, R407E, R410A, R410B, R404A, R507A, R508, etc. ), HC (butane, isobutane, ethane, propane, propylene, etc., and some mixed refrigerants of these refrigerants), natural refrigerant (air, carbon dioxide, ammonia, etc., and some mixed refrigerants of these refrigerants), and these refrigerants Some mixed refrigerants such as Be used, such types of refrigerant, can achieve its effect.

  Moreover, although the example of air and a refrigerant | coolant was shown as a working fluid, even if it uses other gas, liquid, and gas-liquid mixed fluid, there exists the same effect.

  The heat transfer tube 2 and the plate fin 1 are often made of different materials, but the same material such as copper is used for the heat transfer tube 2 and the plate fin 1 and aluminum is used for the heat transfer tube 2 and the plate fin 1. By using it, the plate-like fins 1 and the heat transfer tubes 2 can be brazed, the contact heat transfer rate between the plate-like fins 1 and the heat transfer tubes 2 is dramatically improved, and the heat exchange capability is greatly improved. Moreover, recyclability can also be improved.

  As a method for bringing the heat transfer tube 2 and the plate-like fin 1 into close contact, when brazing in the furnace, the brazing in the case of pre-treatment is performed by post-processing to apply a hydrophilic material to the plate-like fin 1. The burning of the hydrophilic material inside can be prevented.

  Moreover, the heat transfer performance can be improved by applying a heat radiation coating that promotes heat transfer by radiation on the plate-like fins 1.

  The heat exchanger 4 and the air conditioner using the heat exchanger 4 described in the first and second embodiments are not limited to mineral oil, alkylbenzene oil, ester oil, ether oil, fluorine oil, and the like. The effect can be achieved with any refrigeration oil, whether the oil is soluble or not.

It is a cross-sectional view which shows the indoor unit of the air conditioner of Embodiment 1 of this invention. It is a figure which shows the flow of the air of the indoor unit of FIG. It is a characteristic view which shows the relationship between the pressure loss of the air blower of the indoor unit of FIG. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is sectional drawing which shows the plate-shaped fin of the heat exchanger of the indoor unit of FIG. It is sectional drawing which shows the plate-shaped fin of the heat exchanger of another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is sectional drawing which shows the plate-shaped fin of the heat exchanger of the indoor unit of FIG. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a cross-sectional view which shows the state which opened the front panel of the indoor unit of FIG. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a cross-sectional view which shows another indoor unit of the air conditioner of Embodiment 1 of this invention. It is a figure explaining the flow of the air of the heat exchanger of the indoor unit of FIG. It is a figure explaining the flow of the air of the heat exchanger of the indoor unit of the air conditioner of Embodiment 1 of this invention. It is a refrigerant circuit diagram which shows the refrigerant circuit of Embodiment 2 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Plate-like fin, 2 Heat exchanger tube, 3 Cutting and raising 4 (4a, 4b, 4c) Tube type heat exchanger, 4a Front lower heat exchanger, 4b Front upper heat exchanger, 4c Rear heat exchanger, 4f
Auxiliary heat exchanger, 5 blower, 6 air flow passage, 7 inlet, 17 outlet, 20 gap, 35 end face, 36 side face.

Claims (10)

A plurality of finned tube heat exchangers, in which a suction port, plate-like fins are laminated, and a heat transfer tube is passed through, a blower, an air flow passage, and a blowout port,
The plurality of finned tube heat exchangers are disposed so as to surround the blower,
Among the plurality of finned tube heat exchangers, the air pressure loss of the heat exchanger disposed on the suction port side is disposed further away from the heat exchanger on the suction port side than the suction port. An air conditioner indoor unit characterized in that the air pressure loss of the heat exchanger is reduced.   The suction port is provided in the upper portion, and the heat exchanger on the suction port side of the plurality of fin tube heat exchangers is on the upper front side, downward from the suction port side of the upper portion, and the upper portion is lower in the rear direction. A front upper heat exchanger installed at a slight forward angle and a rear heat exchange installed on the upper rear side from the suction port side of the upper part downward, with the upper part facing forward and the lower part inclined slightly rearward And the heat exchanger disposed away from the suction port is a lower front heat exchanger installed at a lower part of the front and substantially vertically following the upper front heat exchanger. The air conditioner indoor unit according to claim 1.   The plate fin of the heat exchanger on the suction port side is cut and raised, and the heat exchanger arranged away from the suction port is not cut and raised on the plate fin. The indoor unit of the air conditioner according to claim 1 or 2.   The plate-like fin of the heat exchanger on the suction port side is cut and raised, and the heat exchanger arranged away from the suction port is also cut and raised. The indoor unit of an air conditioner according to claim 1 or 2, wherein at the lowest end in the gravitational direction, only the most downstream part in the row direction is cut and raised, and the upstream side is not formed. .   The plate fin of the heat exchanger on the suction port side is cut and raised, and the heat exchanger arranged away from the suction port is also cut and raised. The shape of the furthest downstream part of the air flow is a parallelogram that forms a predetermined angle downward with respect to the row direction by cutting the plate fin portion that is approaching. The indoor unit of the air conditioner according to claim 1 or 2.   The fin pitch of the plate-like fins of the heat exchanger arranged away from the suction port is larger than the fin pitch of the plate-like fins of the heat exchanger on the suction port side. The indoor unit of the air conditioner according to claim 5.   The height of the cut-and-raised provided on the plate-like fin of the heat exchanger arranged away from the suction port is higher than the height of the cut-and-raised provided on the plate-like fin of the heat exchanger on the inlet side. The indoor unit of an air conditioner according to any one of claims 1 to 6, wherein the indoor unit is small. A plurality of finned tube heat exchangers, laminated with plate-like fins and penetrated through heat transfer tubes, a blower, an air flow passage, and a blowout port;
The plurality of finned tube heat exchangers includes a heat exchanger on the suction port side, and a heat exchanger disposed further away from the heat exchanger on the suction port side with respect to the suction port, These are arranged to surround the blower,
An auxiliary heat exchanger is added to the upstream side of the air flow of the heat exchanger arranged further away from the suction port, and a gap for sucking air is formed in the front panel on the front surface of the auxiliary heat exchanger. An air conditioner indoor unit characterized by the above.   The heat exchanger on the suction port side is located on the upper front side, downward from the upper suction port side, the upper upper heat exchanger installed at the rear and the lower at the front slightly inclined, and the upper rear side And a rear heat exchanger installed with the upper part at the front and the lower part at the rear with a slight inclination, and the two heat exchangers have the same shape, The indoor unit of an air conditioner according to any one of claims 1 to 8, wherein one end face and the other side face are connected in surface contact on the suction port side. Front upper heat exchanger and rear heat exchanger, which are heat exchangers arranged on the inlet side, and lower front heat exchanger, which is a heat exchanger arranged further away from the heat exchanger on the inlet side The air conditioner indoor unit according to any one of claims 1 to 9, wherein each is manufactured separately.

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