TW202033917A - air conditioner - Google Patents

Abstract

The present invention provides an air conditioner comprising an indoor unit and an outdoor unit, wherein: the indoor unit has an indoor heat exchanger; the outdoor unit has an expansion valve; the indoor heat exchanger has a two-row heat exchanger in which heat transfer pipes are arranged in two rows, and a one-row heat exchanger in which heat transfer pipes are arranged in one row; and the expansion valve is connected to the one-row heat exchanger via at least part of one row of the two-row heat exchanger and also via at least part of the other row of the two-row heat exchanger.

Description

air conditioner

The present invention relates to an air conditioner equipped with an indoor unit and an outdoor unit.

The air conditioner is equipped with an outdoor unit and an indoor unit, and each of the outdoor unit and the indoor unit is equipped with a heat exchanger that exchanges heat between air and refrigerant, and a blower that generates air flow. During air-conditioning operation, low-temperature refrigerant flows inside the heat exchanger installed in the indoor unit, and the air inside the building flows outside the heat exchanger, thereby cooling the air inside the building . At this time, a part of the water vapor contained in the air in the building is cooled on the surface of the heat exchanger. As a result of this, condensation occurs. Condensed water on the surface of the heat exchanger is discharged from the drain pipe to the outdoors through the fins of the heat exchanger and through the drain pan.

When there is a temperature distribution in the heat exchanger, a part of the air may be excessively cooled and a part of the air may become insufficiently cooled. When such air with a temperature difference is blown from the heat exchanger, condensation may occur on the air blowing path of the blow-out portion of the indoor unit. Condensation on the air supply path may be blown out into the room from the air outlet along with the wind or drip into the room via the air supply path. In contrast to this, Patent Document 1 discloses a technique in which in order to prevent condensation inside the indoor unit, a temperature sensor is installed at the heat exchanger of the indoor unit, and by responding to the measured value The temperature of the expansion valve is controlled so as not to generate a temperature difference inside the heat exchanger. Also, from the viewpoint of cost reduction and compaction, it is expected to be applied by A heat exchanger composed of one heat exchanger and two heat exchangers. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Laid-Open No. 8-159538

[The problem to be solved by the invention]

However, in a heat exchanger composed of one row of heat exchangers and two rows of heat exchangers, compared to the two rows of heat exchangers, the air is easier to flow in the one row of parts. Therefore, there is a problem that the temperature of the air after passing through the heat exchanger is likely to be different.

The present invention was made in view of such problems, and its purpose is to use a heat exchanger equipped with one row of heat exchangers and two rows of heat exchangers while also preventing condensation inside the indoor unit. prevent. [Means to solve the problem]

Therefore, the present invention is an air conditioner provided with an indoor unit and an outdoor unit, characterized in that the indoor unit is equipped with an indoor heat exchanger, the outdoor unit is equipped with an expansion valve, and the indoor heat exchanger , Is equipped with two rows of heat exchangers arranged with two rows of heat pipes, and a row of heat exchangers arranged with one row of heat pipes, the aforementioned two rows of heat exchangers are arranged in the aforementioned indoor unit On the front side, the one row of heat exchangers is arranged on the back side of the indoor unit. During cooling operation, the expansion valve is through at least a part of one of the two rows of heat exchangers and the two rows of heat exchange At least a part of the other row of the heat exchanger is connected to the heat exchanger of the first row, and the flow path of the indoor heat exchanger is formed by one passage.

Another aspect of the present invention is an air conditioner equipped with an indoor unit and an outdoor unit, characterized in that the indoor unit is equipped with an indoor heat exchanger, the outdoor unit is equipped with an expansion valve, and the indoor heat exchange The heat exchanger is equipped with two rows of heat exchangers arranged with two rows of heat pipes and a row of heat exchangers arranged with one row of heat pipes. The two rows of heat exchangers are arranged in the indoor unit On the front side, the indoor heat exchanger is provided with a first row of heat exchangers and a second row of heat exchangers. The first row of heat exchangers are arranged in the indoor unit. On the back side, the second row of heat exchangers is arranged below the two rows of heat exchangers. During cooling operation, the expansion valve passes through at least a part of one of the two rows of heat exchangers. And at least a part of the other row of the two rows of heat exchangers is connected to the one row of heat exchangers, and the flow path of the indoor heat exchanger is formed with one passage.

Yet another form is an air conditioner provided with an indoor unit and an outdoor unit, characterized in that the indoor unit is equipped with an indoor heat exchanger, the outdoor unit is equipped with an expansion valve, and the indoor heat exchanger , Is equipped with two rows of heat exchangers arranged with two rows of heat pipes, and a row of heat exchangers arranged with one row of heat pipes, the aforementioned two rows of heat exchangers are arranged in the aforementioned indoor unit On the front side, the one row of heat exchangers is arranged on the back side of the indoor unit. During cooling operation, the expansion valve is connected to the one row of heat exchangers via at least a part of the two rows of heat exchangers. For connection, the aforementioned two rows of heat exchangers are piping so that the temperature of the connecting part of the aforementioned one row of heat exchangers and the aforementioned two rows of heat exchangers will be the temperature determined in accordance with the dew point temperature. The flow path of the indoor heat exchanger is formed with one passage.

Yet another form is an air conditioner provided with an indoor unit and an outdoor unit, characterized in that the indoor unit is equipped with an indoor heat exchanger, the outdoor unit is equipped with an expansion valve, and the indoor heat exchanger , Is equipped with two rows of heat exchangers arranged with two rows of heat pipes, the first row of heat exchangers arranged with one row of heat pipes, and the second row of heat pipes arranged with one row One row of heat exchangers, the aforementioned two rows of heat exchangers are arranged on the front side of the indoor unit, the aforementioned first row of heat exchangers are arranged on the back side of the indoor unit, and the aforementioned second row of heat exchangers One row of heat exchangers is arranged below the two rows of heat exchangers. During cooling operation, the expansion valve is heated by the first row of heat exchangers through at least a part of the two rows of heat exchangers. The heat exchangers are connected and the first row of heat exchangers are connected. The two rows of heat exchangers are used so that the temperature of the junction between the two rows of heat exchangers and the first row of heat exchangers will be dependent on the dew point The temperature is determined by the temperature method, and is used as a pipe, and the flow path of the aforementioned indoor heat exchanger is formed with one passage.

Yet another form is an air conditioner provided with an indoor unit and an outdoor unit, characterized in that the indoor unit is provided with an indoor heat exchanger, and the indoor heat exchanger is provided with two rows of Two rows of heat exchangers with heat pipes and one row of heat exchangers with one row of heat pipes. The two rows of heat exchangers are placed on the front side of the indoor unit. The one row of heat exchangers, It is arranged on the back side of the indoor unit. The outdoor unit is equipped with an expansion valve. During cooling operation, the expansion valve passes through all the flow paths of the two rows of heat exchangers in the two rows of heat exchangers. More than half of the flow paths are connected to the aforementioned one row of heat exchangers, and the flow paths of the aforementioned indoor heat exchanger are formed with one path.

Yet another form is an air conditioner provided with an indoor unit and an outdoor unit, characterized in that the indoor unit is provided with an indoor heat exchanger, and the indoor heat exchanger is provided with two rows of Two rows of heat exchangers with heat pipes, and the first row of heat exchangers with one row of heat pipes, and the second row of heat exchangers with one row of heat pipes, the aforementioned two rows The heat exchanger is arranged on the front side of the indoor unit, the first row of heat exchangers is arranged on the lower side of the two rows of heat exchangers, and the second row of heat exchangers is It is arranged on the back side of the indoor unit. The outdoor unit is equipped with an expansion valve. During cooling operation, the expansion valve passes through all the flow paths of the two rows of heat exchangers in the two rows of heat exchangers. More than half of the flow path is connected to the first row of heat exchangers and the second row of heat exchangers, and the flow path of the indoor heat exchanger is formed with one path.

Yet another form is an air conditioner provided with an indoor unit and an outdoor unit, characterized in that the indoor unit is equipped with an indoor heat exchanger, the outdoor unit is equipped with an expansion valve, and the indoor heat exchanger , Is equipped with m rows of heat exchangers arranged with m rows of heat conducting tubes, and n rows of heat exchangers arranged with n rows of heat conducting tubes, where m is an integer of 2 or more, and n is 1 or more And an integer smaller than m. The m rows of heat exchangers are arranged on the front side of the indoor unit, and the n rows of heat exchangers are arranged on the back side of the indoor unit. During cooling operation, The expansion valve is connected to the n rows of heat exchangers via at least a part of the first row of the m rows of heat exchangers and at least a portion of the second row of the m rows of heat exchangers, and the indoor heat exchange The flow path of the device is formed with one path.

Yet another form is an air conditioner provided with an indoor unit and an outdoor unit, characterized in that the indoor unit is equipped with an indoor heat exchanger, the outdoor unit is equipped with an expansion valve, and the indoor heat exchanger , Is equipped with m rows of heat exchangers arranged with m rows of heat pipes, the first n row of heat exchangers arranged with n rows of heat pipes, and the second row of heat pipes arranged with n rows N rows of heat exchangers, where m is an integer greater than or equal to 2; n is an integer greater than or equal to 1 and smaller than m. The m rows of heat exchangers are arranged on the front side of the indoor unit. The first n-row heat exchanger is arranged below the m-row heat exchanger, and the second n-row heat exchanger is arranged on the back side of the indoor unit. During cooling operation, the aforementioned The expansion valve is connected to the first n rows of heat exchangers and the second row via at least a part of the first row of the m rows of heat exchangers and at least a portion of the second row of the m rows of heat exchangers. N rows of heat exchangers are connected, and the flow path of the aforementioned indoor heat exchanger is formed with one passage. [Effects of Invention]

According to the present invention, it is possible to prevent condensation inside the indoor unit while using a heat exchanger provided with one row of heat exchangers and two rows of heat exchangers.

Hereinafter, the embodiments of the present invention will be described in detail using drawings. However, the present invention is not limited to the following embodiments. Various modifications or application examples in the technical concept of the present invention are also It is included in the scope of the present invention.

(First Embodiment) Fig. 1 is a diagram showing the structure of an indoor unit 100 of an air conditioner according to the first embodiment. FIG. 1 is a cross-sectional view perpendicular to the back 120 of the indoor unit 100 and parallel to the vertical direction of the indoor unit 100. Hereinafter, the x-axis direction (the depth direction of the paper) in the general three-dimensional coordinates as shown in FIG. 1 is taken as the horizontal direction of the indoor unit 100, and the y-axis direction (the vertical direction of the paper) is taken as the top and bottom of the indoor unit 100 The direction (the upper side of the paper is the upper direction), and the z-axis direction (the horizontal direction of the paper) is the depth direction of the indoor unit 100.

The indoor unit 100 is installed near the ceiling of the room so that the back 120 faces the wall A. In FIG. 1, on the lower left side of the paper, a room that is an air-conditioned space is expanded, and the indoor unit 100 has a structure that allows wind to flow by adjusting the temperature of the room.

Inside the indoor unit 110, an indoor heat exchanger 110 and an indoor fan 102 are mounted. In the indoor heat exchanger 110, air is blown in from the indoor fan 102 to perform heat exchange. The indoor unit 100 is further provided with a filter device 103, a rear housing 104, a front housing 105, louvers 106, and longitudinal louvers 107.

The air is sucked into the indoor unit 100 from the upper side of FIG. 1, that is, from the upper side of the indoor unit 100, and the larger dust is removed by the filter device 103, and passes through the indoor heat Exchanger 110. The indoor fan 102 blows air to the indoor heat exchanger 110. For the indoor fan 102, a cross-flow fan can be used. In the case of using a cross flow fan, a front nose 109 is provided on the front side of the indoor fan 102, and a rear nose 108 is provided on the rear side (on the back side 120 side). With the front nose 109 and the rear nose 108, the air suction side and the air blowing side of the indoor fan 102 are separated, and the indoor fan 102 performs a blowing function.

When the air is sucked in from above the indoor heat exchanger 110 and the wind flows toward the space below as in FIG. 1, the indoor fan 102, as shown in FIG. 1, is in the depth direction from the right. When observed, it rotates toward a clockwise direction. After the air is blown out by the indoor fan 102, it passes through the air path made by the front nose 109 and the rear housing 104, and the blowing direction is changed by the louvers 106 and the longitudinal louvers 107. Control, and flow out to the room. The louver 106 controls the direction of the wind blown up and down. The vertical louver 107 controls the wind direction in the horizontal direction (left-right direction).

The indoor heat exchanger 110 is provided with a heat pipe for allowing refrigerant to flow, and fins connected to the periphery of the heat pipe. In FIG. 1, the plural circles 110a shown inside the indoor heat exchanger 110 represent heat pipes. The heat pipe extends in the depth direction, and is connected with a U-shaped pipe at the right or left end to form a flow path (1 path) of the refrigerant. The fins are aluminum plates with a thickness of about 0.1 mm and are connected in the horizontal direction of the indoor heat exchanger 110 at intervals of about 1 mm. The fin and the heat-conducting pipe are closely attached to each other, and the refrigerant passes through the inside of the heat-conducting pipe.

In the cooling operation, a refrigerant having a lower temperature than the indoor air temperature is supplied from the outdoor unit 200 to the indoor heat exchanger 110. The temperature of the fin of the indoor heat exchanger 110 is close to the temperature of the supplied refrigerant. The warm air in the room flows by the indoor fan 102 and is cooled by the indoor heat exchanger 110. When the temperature of the fin of the indoor heat exchanger 110 is lower than the dew point of the indoor air flowing in the indoor heat exchanger 110, the moisture in the air is condensed on the surface of the fin of the indoor heat exchanger 110 . The condensed water is conducted on the fins and flows below the indoor heat exchanger 110, and is conducted through the drainage channel provided inside the casing and flows out to the outdoors. In this way, during the cooling operation, moisture in the air may condense at the indoor heat exchanger 110. In addition, although the air passing through the indoor heat exchanger 110 is cooled by the indoor heat exchanger 110 and part of the moisture is condensed, the relative humidity is kept close to 100%.

FIG. 2 is a diagram showing the structure of the indoor heat exchanger 110. The indoor heat exchanger 110 includes two rows of heat exchangers 111, one row of heat exchangers 112 on the front side, and one row of heat exchangers 113 on the back side. The two rows of heat exchangers 111 are on the front of the indoor unit 100 On the upper side, two rows of heat transfer pipes are arranged along the depth direction. In the two rows of heat exchangers 111, two rows of heat transfer pipes are arranged along the direction in which the air flows when the indoor fan 102 is driven. The front side of the two rows of heat exchangers 111, that is, the row on the windward side, is referred to as the windward row 1111. In addition, the rear side of the two rows of heat exchangers 111, that is, the row on the leeward side, is referred to as the leeward row 1112. The heat exchanger 112 of one row on the front side is arranged so as to extend downward from the lower side of the heat exchanger 111 of the two rows. One row of heat exchangers 113 on the back side is arranged so as to extend from the upper side of the two rows of heat exchangers 111 toward the back side. In addition, the lowest stage 111a of the two rows of heat exchangers 111, which becomes the inlet for the refrigerant during the cooling operation, is connected to the expansion valve of the outdoor unit via a pipe. In addition, the lowermost stage 13b of the back side heat exchanger 113, which becomes the outlet of the refrigerant during cooling operation, is connected to the four-way valve of the outdoor unit via a pipe.

The indoor heat exchanger 110 of this embodiment is equipped with one row part in this way. In the heat exchanger of the prior art, two rows of heat exchangers are often used on both the front side and the back side. On the other hand, the indoor heat exchanger 110 of this embodiment reduces the material of the heat exchanger by setting a part of the front side and the back side as one row of heat exchangers. As a result, not only can resources be effectively used, but also the effect of maintaining compactness and energy saving can be expected.

However, in the case of row 1 and row 2, the ventilation resistance of air at the same wind speed will be different by a factor of about one. Therefore, if the simple consideration is based on the wind speed, the air volume passing through one row of heat exchangers and the air volume passing through two rows of heat exchangers will also be 1.4 times different. In addition, in fact, since the air is sucked from the ceiling side (upper side) of the indoor unit 100, the arrangement of the indoor heat exchanger 110 shown in FIG. The position of the exchanger 111 is based on the row of heat exchangers 112 on the front side below, making it more difficult to suck in air. Therefore, it is conceivable that the difference in air volume will become 1.4 times and smaller. At the heat exchanger 113 on the back side, the rear nose 108 may be a wall that hinders the air flow from the heat exchanger 113 on the back side to the indoor fan 102. Therefore, in the heat exchanger 113 of one row on the back side, it is similarly difficult to suck in air compared to the heat exchanger 111 of the two rows. That is, the heat exchange efficiency of the two rows of heat exchangers 111 is higher than that of the front row of heat exchangers 112 and the back row of heat exchangers 113.

In addition, as described above, the indoor heat exchanger 110 of the present embodiment is configured as a single passage that does not branch the refrigerant passage in the middle. The reason for this is to reduce the risk of leakage by reducing the number of welds caused by divergence and the like to simplify the passage of the refrigerant in the heat exchanger when using flammable refrigerant. As the flammable refrigerant, propane (R290) and the like can be cited. Moreover, as a flammable refrigerant, difluoromethane (R32) or 2,3,3,3-tetrafluoropropene (R1234yf), etc. are mentioned.

Furthermore, in this embodiment, the heat pipe system is made of aluminum or aluminum alloy. In this way, when aluminum or aluminum alloy is used for the heat pipe, the weldability is not good compared to copper pipes. Therefore, by reducing the number of welds, it is helpful to improve the productivity of the heat exchanger. Compared with copper, it is conceivable that aluminum is buried in a larger amount. In order to realize a sustainable society, it is conceivable that it is effective to reduce the copper used and replace it with aluminum. Also, the part where the aluminum pipe and the copper pipe are joined may be corroded if condensation occurs. Therefore, it is expected that excessive condensation will not occur as much as possible. For the above reasons, one passage is used in the two-row heat exchanger 111 in this embodiment.

During cooling operation, near the inlet of the two rows of heat exchangers 111, the refrigerant is in a state where there are many liquid phases. When passing through the two rows of heat exchangers 111, the air is gradually reduced by the liquid phase of the refrigerant. cool down. Therefore, when passing through the two rows of heat exchangers 111, the gas phase in the refrigerant gradually increases. Therefore, in the flow path of the refrigerant in the two rows of heat exchangers 111, the speed of the refrigerant will gradually increase. In the heat exchanger of the prior art, a branch is provided at the piping of the heat exchanger, and the pressure loss of the refrigerant in the two rows of heat exchangers is reduced by dividing the flow of the refrigerant. In contrast, in the two-row heat exchanger 111 of the present embodiment, since one passage is used, the acceleration system of the refrigerant due to pressure loss becomes larger than that in the case of two passages. Due to the increased pressure loss, in the second half of the flow path of the two rows of heat exchangers 111, the pressure is lowered compared to the first half, and the saturation temperature is also lowered along with this. Because of this, the temperature difference of the refrigerant inside the heat exchanger becomes larger. On the other hand, the indoor heat exchanger 110 of this embodiment can prevent condensation caused by this temperature difference by the following structure.

The arrows shown in Figure 2 represent the flow of refrigerant during cooling operation. During the cooling operation, it is decompressed by the expansion valve of the outdoor unit described later and becomes a low-temperature two-phase refrigerant. The lowermost section 111a of the air train 1111 above the two-row heat exchanger 111 is used as the inlet. It flows into the two rows of heat exchangers 111. After that, the refrigerant flows in the upwind train 1111 in the direction opposite to the direction of gravity, that is, upwards. If it flows to the uppermost section 111b, then it flows into the downwind train 1112. In the downwind train 1112, the refrigerant flows downward from the uppermost section 111c, and if it flows to the lowermost section 111d, it then flows into the uppermost section 112a of the heat exchanger 112 in the front row. Similarly, at the heat exchanger 112 in the front row, the refrigerant flows downward, and if it flows to the lowest stage 112b, it flows into the heat exchanger 113 in the rear row. In the heat exchanger 113 in the row on the back side, the refrigerant flows downward from the uppermost stage 113a to the lowermost stage 113b, and flows out with the lowermost stage 113b as an outlet.

In the above configuration, the refrigerant on the cold air inlet side of the indoor heat exchanger 110 exchanges heat with the air in two rows of heat exchangers 111 with a large heat transfer area. Furthermore, the refrigerant whose temperature is lowered due to passing through the two rows of heat exchangers 111 is mixed with air at the front side row of heat exchangers 112 and the back side row of heat exchangers 113. Heat exchange. With this, the temperature of the air after passing through the indoor heat exchanger 110 can be made close to uniform. That is, it is possible to suppress the occurrence of dew condensation in the air supply path downstream of the indoor heat exchanger 110.

In addition, it is preferable that the refrigerant flowing out of the two rows of heat exchangers 111 flows into the one row of heat exchangers 112 on the front side and the row of heat exchangers 113 on the back side as close as possible to the two rows of heat exchangers. 111 position. From this point of view, in this embodiment, the same applies to the heat exchanger 112 in the front row and the heat exchanger 113 in the back row, and the refrigerant flows into the uppermost stage 112a, 113a. The way is made piping.

In addition, in FIG. 2, although the flow of the refrigerant during the cooling operation is shown, the flow of the refrigerant during the heating operation is opposite to that during the cooling operation. During heating operation, the piping that becomes the inlet of the refrigerant during cooling is the outlet. During the heating operation, a gas refrigerant flows into the indoor heat exchanger 110 and is liquefied due to warming the air. At the heating outlet of the indoor heat exchanger 110, the refrigerant is cooled and almost becomes liquid, which is lower than the inlet and flows out. Therefore, in order to obtain as large a temperature difference as possible with the air and conduct heat to the air, it is better to use the windward side that is in contact with the air that does not pass through the indoor heat exchanger 110. In addition, the passage on the heating outlet side is designed to flow from the upper stage to the lower stage according to gravity, and the liquid becomes easy to flow, and the retention of the refrigerant can be suppressed. The indoor heat exchanger 110 of this embodiment is based on these viewpoints, and the outlet during heating, that is, the heat exchange inlet during cooling, is set as the lowermost section of the air row 1111 above the two rows of heat exchangers 111 111a, and set it to flow from there to the upper section.

Furthermore, the lowermost stage 112b of the heat exchanger 112 in the row on the front side and the uppermost stage 113a of the heat exchanger 113 in the row on the back side are connected by piping. This piping will also become a factor of pressure loss. Therefore, this piping is set to be thicker than other piping. Furthermore, in order to avoid heat exchange with other than blown air, it is set to be covered with an insulating material.

Fig. 8 is a diagram showing a heat exchanger 800 of a comparative example. The heat exchanger 800 is the same as the indoor heat exchanger 110 of this embodiment, and includes two rows of heat exchangers 801, one row of heat exchangers 802 on the front side, and one row of heat exchangers 803 on the back side. One row of heat exchangers 802 on the front side is arranged below the two rows of heat exchangers 801, and one row of heat exchangers 803 on the back side is extended from the upper side of the two rows of heat exchangers 801. It is set on the back side.

In the heat exchanger 800, the refrigerant flows into the heat exchanger 800 with the lowermost section 801a of the air train 8011 above the two heat exchangers 801 as an inlet. After that, the refrigerant flows upward in the upwind row 8011, and if it flows to the uppermost stage 801b, it then flows into the uppermost stage 802a of the heat exchanger 802 in the front row. The refrigerant flows upward from the lowermost stage 802a to the uppermost stage 802b, and then flows upward from the lowermost stage 801c of the air train 8012 under the two heat exchangers 801 to the uppermost stage 801d. After that, the refrigerant flows downward from the uppermost stage 803a of the row of heat exchangers 803 on the back side to the lowermost stage 803b.

In the above configuration, the temperature of the refrigerant near the inlet side of the cold air is not sufficiently lowered. Therefore, before the refrigerant in only one of the two rows of heat exchangers 801 flows, one row of heat exchangers 802 on the front side, The system cannot perform sufficient heat exchange, and the cooling and dehumidification system becomes insufficient. On the other hand, under the two rows of heat exchangers 801, the wind row 8012 is particularly near the uppermost section 801d. Since it is a two-row section and flows with a refrigerant whose temperature has been lowered, compared to the others, The temperature reduction system becomes significant. Therefore, the cold air near the downwind train 8012 and the warm air near the heat exchanger 802 on the front side are mixed with each other, which may cause condensation in the air supply path.

On the other hand, as shown in FIG. 2, the indoor heat exchanger 110 of the present embodiment is configured to pass through all of the two rows of heat exchangers 111 and then flow into the front row of heat exchangers 112. In general piping. As a result, in the two rows of heat exchangers 111 where the temperature of the air is easily lowered, the refrigerant on the inlet side of the cold air having a relatively high temperature flows. On the other hand, the heat exchanger 112 in the row on the front side and the heat exchanger 113 in the row on the back side flow refrigerant whose temperature has been lowered. By this, the difference in air temperature in the entire indoor heat exchanger 110 can be reduced.

Fig. 3 is a diagram showing a modification of the indoor heat exchanger 110. FIG. 9 is a diagram showing a comparative example corresponding to the modification shown in FIG. 3. In the example shown in FIG. 3, the refrigerant flows through two rows of heat exchangers 111, and flows through one row of heat exchangers 112 on the front side, and then flows into the bottom of the row of heat exchangers 113 on the back side. In 113b, it flows upward to the uppermost stage 113a. In this way, the inlets for the refrigerant in one row of heat exchangers may not absolutely be arranged at the position closest to the two rows of heat exchangers.

On the other hand, in the heat exchanger 900 of the comparative example shown in FIG. 9, the refrigerant flows downward from the uppermost stage 901a of the two-row heat exchanger 901 to the lowermost stage 901b, and then flows in Before going to the leeward side, it enters the lowermost stage 902a of the heat exchanger 902 of the front row, and flows upward to the uppermost stage 902b. Then, the refrigerant flows from the lowermost section 901c on the wind side of the two rows of heat exchangers 901 toward the uppermost section 901d, and then flows from the uppermost section 903a of the heat exchanger 113 on the back side to the lowermost section 903b. .

In the indoor heat exchanger 110 of the modified example shown in Fig. 3, based on the theoretical calculation under the rated conditions of the cold air, the cold air inlet temperature is 16.2°C, and the temperature of the uppermost section 111c of the two rows of heat exchangers 111 is 15.7°C The temperature of the lowermost stage 112b of the heat exchanger 112 on the front side is 14.5°C, and the temperature of the uppermost stage 113a, which is the outlet of the heat exchanger 113 on the back side, is 13.2°C. On the other hand, in the heat exchanger 900 of the comparative example shown in FIG. 9, the cold air inlet temperature is 16.3°C, the temperature of the lowermost stage 902a of the heat exchanger 902 on the front side is 15.8°C, and the uppermost stage 902b The temperature is 15.3°C, the temperature of the uppermost stage 901d of the two rows of heat exchangers 901 is 14.3°C, and the temperature of the lowermost stage 803b of the heat exchanger 903 on the back side, which is the outlet, is 13.1°C.

As described above, it can be seen that in the comparative example, the lowermost stage 902a of the heat exchanger 902 on the front side has insufficient cooling and insufficient dehumidification, while the uppermost stage 901d becomes supercooled. In contrast, in the indoor heat exchanger 110 of the modified example, the temperature of the lowermost stage 112a of the heat exchanger 112 in the row on the front side is lower than the corresponding position (lowest stage 902a) of the comparative example. It can be seen that the system is sufficiently cooled. In addition, in the indoor heat exchanger 110 of the modified example, the temperature of the uppermost section 111c of the two rows of heat exchangers 111 is higher than the corresponding position of the comparative example (the uppermost section 901d), and it can be seen that The overcooling situation is eliminated. As described above, in this embodiment, it is possible to prevent condensation inside the indoor unit 100 while using the indoor heat exchanger 110 equipped with one row of heat exchangers and two rows of heat exchangers.

FIG. 4 is an overall configuration diagram of the air conditioner 10 including the indoor unit 100. The air conditioner 10 includes an indoor unit 100 and an outdoor unit 200. The indoor unit 100 and the outdoor unit 200 are connected by a refrigerant connection pipe. The outdoor unit 200 includes a four-way valve 201, a compressor 202, an accumulator 203, an expansion valve 204, an outdoor heat exchanger 205, and an outdoor fan 206.

The arrow 12 represents the flow direction of the refrigerant during heating operation. In the heating operation, the outdoor unit 200 supplies high-temperature and high-pressure gas refrigerant to the indoor unit 100. The refrigerant flowing in the indoor heat exchanger 110 warms the indoor air supplied by the indoor fan 102. On the contrary, the gas refrigerant is cooled by low-temperature air, so it condenses and becomes a high-pressure liquid refrigerant. The refrigerant liquefied in the indoor unit 100 flows toward the outdoor unit 200 and reaches the expansion valve 204.

The high-pressure liquid refrigerant is decompressed and lowered at the expansion valve 204, and becomes a gas-liquid two-phase flow. It becomes a low-pressure, low-temperature refrigerant and reaches the outdoor heat exchanger 205. At the outdoor heat exchanger 205, outdoor air flows by the outdoor fan 206. Since the refrigerant is decompressed at the expansion valve 204 so that it becomes lower in temperature than the outside air, the outdoor heat exchanger 205 is warmed by the outside air, and the liquid refrigerant evaporates and becomes Gas refrigerant.

The low-pressure, low-temperature refrigerant vaporized in the outdoor heat exchanger 205 reaches the four-way valve 201. At this time, the four-way valve 201 is switched so that the gas refrigerant flowing out of the outdoor heat exchanger 205 returns to the suction side of the compressor 202 via the accumulator 203. The low-temperature and low-pressure gas refrigerant passes through the four-way valve 201, passes through the accumulator 203 and reaches the compressor 202. The accumulator 203 has a function of preventing a large amount of liquid refrigerant from flowing into the compressor 202.

Arrow 11 represents the flow direction of refrigerant during cooling operation. The compressor 202 compresses the refrigerant in the low temperature and low pressure state and discharges the gas refrigerant in the high temperature and high pressure state. The high-temperature, high-pressure gas refrigerant discharged by the compressor 202 reaches the four-way valve 201. At the four-way valve 201, the valve is switched so that the gas refrigerant flowing from the compressor 202 flows toward the outdoor heat exchanger 205 side. In the case of cooling operation, a high temperature and high pressure gas refrigerant flows into the outdoor heat exchanger 205. The outdoor air whose temperature is lower than that of the gas refrigerant flows to the outdoor heat exchanger 205. The outdoor heat exchanger 205 cools and condenses the gas refrigerant and changes the phase into a liquid refrigerant. At the outdoor heat exchanger 205, a part or all of the gas refrigerant is liquefied and reaches the expansion valve 204, where it is decompressed. Due to the decompression, part of the refrigerant is vaporized, and the temperature of the refrigerant is reduced by the heat of vaporization. However, this low-temperature refrigerant flows to the indoor unit 100 through the refrigerant connection pipe.

The decompression amount of the refrigerant at the expansion valve 204 can be adjusted by the opening degree of the valve inside the expansion valve 204. If the opening degree is decreased, the decompression amount becomes larger and the refrigerant becomes lower. On the other hand, if the degree of opening is increased, the amount of pressure reduction is reduced, and the temperature drop of the refrigerant becomes smaller. Under the air-conditioning operation condition, the opening degree of the expansion valve 204 is adjusted in such a way that the temperature of the refrigerant reaching the indoor unit 100 becomes lower than the temperature of the indoor air.

In addition, as a first modification, the indoor heat exchanger 110 is designed so that the refrigerant flows into the front side after passing at least a part of the upper air train 1111 and at least a part of the lower air train 1112 of the two heat exchangers 111. One row of heat exchanger 112 or one row of heat exchanger 113 on the back side may be piping, and other piping states are not limited by the embodiment.

For example, the system can also allow the refrigerant to pass through a part of the upwind train 1111, pass through all the heat pipes of the downwind train 1112, then pass through the remaining flow path of the upwind train 1111, and then flow into the front row 1 The heat exchanger 112 or one row of heat exchangers 113 on the back side are used as piping. Also, for example, it is also possible to pipe the refrigerant through all of the two rows of heat exchangers 111, pass through the back side heat exchanger 113, and then flow into the front side heat exchanger 112. . In addition, for example, the refrigerant can flow into the heat exchanger 112 of the front row with the uppermost stage 111b and 111c of the two rows of heat exchangers 111, and then pass through the two rows of heat exchangers. After the uppermost stages 111b and 111c of the exchanger 111, it flows into the heat exchanger 113 on the back side and is used as a pipe.

However, from the viewpoint of preventing condensation, when flowing from the two rows of heat exchangers 111 to the front row of heat exchangers 112 and 113, the refrigerant system must be sufficiently cooled. Ideally, the temperature of the refrigerant should be constant. It is cooled to a temperature close to the dew point. Therefore, the indoor heat exchanger 110 passes through the two rows of heat exchangers 111, and the connecting portion between the first row of heat exchangers 112 and the two rows of heat exchangers 111 on the front side becomes a temperature determined in accordance with the dew point temperature. The flow path from the two rows of heat exchangers to the one row of heat exchangers is piped. Here, the connection part is an area from the two rows of heat exchangers 111d to the uppermost stage 112a of the one row of heat exchangers 112. In addition, the temperature determined in response to the dew point temperature may also be the dew point temperature, or may be set to a value higher or lower than the dew point temperature by a certain temperature. In addition, the temperature determined in response to the dew point temperature may have a specific temperature range.

In addition, from the viewpoint of preventing condensation, it may be configured such that the refrigerant in the two rows of heat exchangers 111 passes through more than half of the flow paths of the indoor heat exchanger 110, and then flows into The method in one row of heat exchangers is set to heat the expansion valve and the front side through the flow paths of the two rows of heat exchangers 111 through the flow paths of more than half of all the flow paths of the indoor heat exchanger 110 The switch 112 serves as a linker.

As a second modification, the indoor heat exchanger 110 may be provided with a plurality of heat exchangers with different number of rows, and the combination of the number of rows is not limited by the embodiment. For example, the indoor heat exchanger 110 may include three rows of heat exchangers and two rows of heat exchangers. In this case, in the same way, the indoor heat exchanger 110 is configured such that the refrigerant passes through a heat exchanger with a large number of rows first, and after passing a distance that will be cooled to the vicinity of the dew point temperature, The way to flow into the heat exchanger where the number of rows is small is used as piping. Furthermore, for example, it is also possible to provide heat exchangers with three or more rows in a general manner such as three rows of heat exchangers, two rows of heat exchangers, and one row of heat exchangers. In this case, similarly, the indoor heat exchanger 110 is configured to serve as a pipe so that the refrigerant passes through a heat exchanger with a larger number of rows in accordance with the number of rows.

(Second Embodiment) Next, the indoor heat exchanger 110 of the second embodiment will be mainly described in terms of differences from the indoor heat exchanger 110 of the first embodiment. Fig. 5 is a cross-sectional view of the indoor heat exchanger 110 according to the second embodiment. In the indoor heat exchanger 110 of the second embodiment, the refrigerant flows into the two rows of heat exchangers 111 in one flow path, and the two rows of heat exchangers 111 branch into two flow paths (2 path). The expansion valve and the lowest stage 111a of the two rows of heat exchangers 111 are connected via piping. As shown in FIG. 5, the refrigerant flows into the lowest stage 111a of the two rows of heat exchangers 111. The flow path that flows upward from the bottom section 111a is located at the third section 111e from the top of the upwind row 111, and is divided into two flow paths. One of the flow paths is “from the third section 111e and then moves to the upper section 111f, the uppermost section 111b, and then flows to the downwind column 1112 from the upper second section 111g, and then flows to the most The upper stage 111c then flows from the uppermost stage 113a of the heat exchanger 113 on the back side to the lowermost stage 113b". The flow path on the other side is "from the upper wind row 1111 from the upper third section 111e, flows to the lower wind row 1112 from the upper third section 111h, and then flows downward in the lower wind row 1112 It flows in the same direction, and then flows from the uppermost stage 112a of the heat exchanger 112 on the front side to the lowermost stage 112b".

In this way, by using the two-pass configuration, the pressure loss of the refrigerant in the heat transfer pipe of the indoor heat exchanger 110 is reduced. However, since the pressure loss is not zero, the temperature of the refrigerant on the inlet side is high, and the temperature of the refrigerant on the outlet side of the refrigerant becomes low. Therefore, in this two-channel configuration, the same is true, and the configuration is configured to first flow the refrigerant through the two rows of heat exchangers 111 and then flow the refrigerant to the front side heat exchanger 112 or the back side 1 row. Passage at heat exchanger 113. By this, after the branch is divided into two passages, it is possible to flow a sufficiently cooled refrigerant regardless of the heat exchanger 112 in the row on the front side and the heat exchanger 113 in the row on the back side. Therefore, the insufficient cooling of the air is eliminated, and the temperature difference of the air temperature after passing through the indoor heat exchanger 110 can be reduced.

As a modification of the second embodiment, the branch position and the flow path after the branch are not limited to the embodiment. However, the branch position is preferably set in the two-row heat exchanger 111. In addition, it is ideal to determine the position of the branch in such a way that the distance between the paths after the branch is equal. Also, in the indoor heat exchanger 110 of the second embodiment, the outlet of the indoor heat exchanger 110 is set to be provided in one row of heat exchangers 112 on the front side or one row of heat exchangers 113 on the back side. Virgin.

(Third Embodiment) Next, the indoor heat exchanger of the third embodiment will be mainly described in terms of differences from the indoor heat exchangers of other embodiments. Fig. 6 is a cross-sectional view of an indoor heat exchanger 210 according to a third embodiment. The indoor heat exchanger 210 of the third embodiment replaces the two rows of heat exchangers 111 and one row of heat exchangers 112 on the front side of the indoor heat exchanger 110 of the first embodiment. Two rows of heat exchangers 221 are integrally formed on the ground.

In this structure, the same is true. The refrigerant that has flowed into the indoor heat exchanger 210 during the cooling operation first passes through the two rows of heat exchangers 221 and then flows to the back side of the row of heat exchangers 222. The way to make piping. In addition, the flow path of the refrigerant is one path. In the indoor heat exchanger 210 of this embodiment, during the cooling operation, the refrigerant first flows into the two rows of heat exchangers 221 using the lowest section 221a of the air row 2211 above the two rows of heat exchangers 221 as the inlet. . Thereafter, the refrigerant flows upward from the lowermost stage 221a to the uppermost stage 221b, and then flows downward from the uppermost stage 221c of the downwind row 2212 to the lowermost stage 221d. After that, the refrigerant flows into the uppermost stage 222a of the heat exchanger 222 in the row on the back side, flows downward to the lowermost stage 222b, and flows out with the lowermost stage 222b as an outlet.

In the indoor heat exchanger 210 of the third embodiment, similar to the indoor heat exchangers in the other embodiments, the refrigerant first flows into the two rows of heat exchangers 221, and after passing through the two rows of heat After all the flow paths of the exchanger 221, the refrigerant flows into the row of heat exchangers 222 on the back side. That is, into the heat exchanger 222 in the row on the back side, a sufficiently cooled refrigerant flows in. Therefore, the temperature difference of the air temperature after passing through the indoor heat exchanger 210 can be reduced, and condensation can be prevented.

(Fourth Embodiment) Next, the indoor heat exchanger 210 of the fourth embodiment will be mainly described in terms of differences from the indoor heat exchanger 210 of the third embodiment. Fig. 7 is a cross-sectional view of the indoor heat exchanger 210 according to the fourth embodiment. In the indoor heat exchanger 210 of the fourth embodiment, the refrigerant flows into the two rows of heat exchangers 221 through one flow path, and the two rows of heat exchangers 221 are branched into two flow paths.

As shown in FIG. 7, the refrigerant system flows into the fifth stage 221e from the bottom of the air train 2211 above the two heat exchangers 221. The refrigerant flows upward from the fifth stage 221e to the uppermost stage 221b. The flow path is at the uppermost section 221b and is divided into two flow paths. One of the flow paths is designed to allow the refrigerant to flow from the uppermost section 221b of the upwind train 2211 to the tenth section 221f from the top of the downwind train 2212, and flow upward to the uppermost section 221c. , And flow into the uppermost section 222a of the heat exchanger 222 in the row on the back side, and use the fourth section 222c from above as the outflow port". The flow path on the other side is designed to allow the refrigerant to flow from the uppermost section 221b of the upwind train 2211 to the sixth section 221g from the bottom of the downwind train 2212, and from above through the next section 221g. The fourth section 221i of the wind train 2211 from below flows downward to the lowest section 221a, and flows into the lowest section 222b of the heat exchanger 222 on the back side, and the fourth section 222d from below is used as the outlet "path of.

As explained in the second embodiment, the same is true in the two-pass configuration. In this way, the refrigerant first flows to the two rows of heat exchangers 221, and then the refrigerant flows to the back side 1 In the row heat exchanger 222, the difference in air temperature after passing through the indoor heat exchanger 210 can be reduced. Furthermore, in this embodiment, the outlets of each passage are all provided in the heat exchanger 222 in the row on the back side. If the outlet of one of the passages is installed in the heat exchanger 222 on the back side, and the outlet of the other passage is installed in the two rows of heat exchangers 221, the refrigerant on the outlet side with a lower temperature will pass In the two rows of heat exchangers 221, there is a possibility that the air may be excessively cooled. In order to avoid such excessive cooling, in this embodiment, as described above, the outlet of each passage is configured to be provided in the heat exchanger 222 in the row on the back side.

10: Air conditioner 100: Indoor unit 110: heat exchanger 111: 2 rows of heat exchangers 112: 1 row heat exchanger on the front side 113: 1 row heat exchanger on the back side

[Figure 1] is a diagram showing the structure of the indoor unit. [Figure 2] is a cross-sectional view of the indoor heat exchanger. [Figure 3] is a diagram showing a modification of the indoor heat exchanger. [Figure 4] is a diagram of the overall structure of the air conditioner. [Fig. 5] is a cross-sectional view of the indoor heat exchanger according to the second embodiment. [Fig. 6] is a cross-sectional view of the indoor heat exchanger according to the third embodiment. [Fig. 7] is a cross-sectional view of the indoor heat exchanger according to the fourth embodiment. [Figure 8] is a diagram showing a heat exchanger of a comparative example. [Figure 9] is a diagram showing a heat exchanger of a comparative example.

100: Indoor unit

102: Indoor fan

103: Filter device

104: rear shell

105: front shell

106: louver

107: Longitudinal louver

108: back nose

109: front nose

110: Indoor heat exchanger

110a: plural circle

120: back

A: Wall

Claims (17)

An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned outdoor unit is equipped with an expansion valve, The aforementioned indoor heat exchanger is provided with a two-row heat exchanger in which two rows of heat transfer pipes are arranged, and a one-row heat exchanger in which one row of heat transfer pipes are arranged, and The two rows of heat exchangers are arranged on the front side of the indoor unit, The one row of heat exchangers is arranged on the back side of the indoor unit, During the cooling operation, the expansion valve is connected to the one row of heat exchangers via at least a part of one of the two rows of heat exchangers and at least a portion of the other row of the two rows of heat exchangers. The flow path of the aforementioned indoor heat exchanger is formed with one passage. An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned outdoor unit is equipped with an expansion valve, The aforementioned indoor heat exchanger is provided with a two-row heat exchanger in which two rows of heat transfer pipes are arranged, and a one-row heat exchanger in which one row of heat transfer pipes are arranged, and The two rows of heat exchangers are arranged on the front side of the indoor unit, The aforementioned indoor heat exchanger is provided with a first row of heat exchangers and a second row of heat exchangers, The first row of heat exchangers are arranged on the back side of the indoor unit, The first row of heat exchangers in the second row is arranged below the heat exchangers in row two, During the cooling operation, the expansion valve is connected to the one row of heat exchangers via at least a part of one of the two rows of heat exchangers and at least a portion of the other row of the two rows of heat exchangers. The flow path of the aforementioned indoor heat exchanger is formed with one passage. Such as the air conditioner described in claim 1 or 2, in which: The aforementioned expansion valve is connected to at least a part of the aforementioned other row via all of the aforementioned one row. The air conditioner described in any one of claims 1 to 3, wherein: The expansion valve is connected to the one row of heat exchangers through all the flow paths in the two rows of heat exchangers. The air conditioner described in any one of claims 1 to 4, wherein: The aforementioned two-row heat exchangers are piped in such a way that the temperature of the connecting portion of the aforementioned one-row heat exchanger and the aforementioned two-row heat exchanger becomes a temperature determined in accordance with the dew point temperature. The air conditioner described in any one of claims 1 to 5, wherein: The expansion valve is connected to the one row of heat exchangers through more than half of the flow paths of the two rows of heat exchangers in the two rows of heat exchangers. The air conditioner described in any one of claims 1 to 6, wherein: The two rows of heat exchangers are connected to the heat pipes in the one row of heat exchangers that are located closest to the two rows of heat exchangers. The air conditioner described in any one of claims 1 to 7, wherein: One of the two rows of heat exchangers is piped in a direction opposite to the direction of gravity from the expansion valve side. The air conditioner described in any one of claims 1 to 8, wherein: One of the aforementioned rows is arranged on the upwind side of the wind flowing into the aforementioned two rows of heat exchangers, The other row is arranged on the leeward side of the wind flowing into the two rows of heat exchangers. The air conditioner described in any one of claims 1 to 9, wherein The outlet of the aforementioned indoor heat exchanger during cooling operation is provided in the aforementioned row of heat exchangers. The air conditioner described in any one of claims 1 to 10, wherein: The heat pipe of the aforementioned indoor heat exchanger is formed of aluminum or aluminum alloy. An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned outdoor unit is equipped with an expansion valve, The aforementioned indoor heat exchanger includes a two-row heat exchanger in which two rows of heat transfer pipes are arranged, and a one-row heat exchanger in which one row of heat transfer pipes are arranged, The two rows of heat exchangers are arranged on the front side of the indoor unit, The one row of heat exchangers is arranged on the back side of the indoor unit, During the cooling operation, the expansion valve is connected to the one row of heat exchangers via at least a part of the two rows of heat exchangers. The aforementioned two rows of heat exchangers are piped in such a way that the temperature of the connecting part of the aforementioned one row of heat exchangers and the aforementioned two rows of heat exchangers will be a temperature determined in accordance with the dew point temperature. The flow path of the aforementioned indoor heat exchanger is formed with one passage. An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned outdoor unit is equipped with an expansion valve, The aforementioned indoor heat exchanger is provided with two rows of heat exchangers arranged with two rows of heat pipes, a first row of heat exchangers arranged with one row of heat pipes, and a row of heat exchangers arranged with one row The second row heat exchanger of the heat pipe, The two rows of heat exchangers are arranged on the front side of the indoor unit, The first row of heat exchangers are arranged below the two rows of heat exchangers, The second row of heat exchangers are arranged on the back side of the indoor unit, During cooling operation, the expansion valve is connected to the first row of heat exchangers and the second row of heat exchangers via at least a part of the two rows of heat exchangers. The aforementioned two-row heat exchangers are piping so that the temperature of the connecting portion between the aforementioned two-row heat exchangers and the aforementioned first row of heat exchangers becomes a temperature determined in accordance with the dew point temperature. The flow path of the aforementioned indoor heat exchanger is formed with one passage. An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned indoor heat exchanger includes a two-row heat exchanger in which two rows of heat transfer pipes are arranged, and a one-row heat exchanger in which one row of heat transfer pipes are arranged, The two rows of heat exchangers are arranged on the front side of the indoor unit, The one row of heat exchangers is arranged on the back side of the indoor unit, The aforementioned outdoor unit is equipped with an expansion valve, During cooling operation, the expansion valve is connected to the first row of heat exchangers through more than half of the flow paths of the two rows of heat exchangers in the two rows of heat exchangers. The flow path of the aforementioned indoor heat exchanger is formed with one passage. An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned indoor heat exchanger is provided with two rows of heat exchangers arranged with two rows of heat pipes, a first row of heat exchangers arranged with one row of heat pipes, and a row of heat exchangers arranged with one row The second row heat exchanger of the heat pipe, The two rows of heat exchangers are arranged on the front side of the indoor unit, The first row of heat exchangers are arranged below the two rows of heat exchangers, The second row of heat exchangers are arranged on the back side of the indoor unit, The aforementioned outdoor unit is equipped with an expansion valve, During the cooling operation, the expansion valve is connected to the first row of heat exchangers and the first row of heat exchangers through more than half of the flow paths of the two rows of heat exchangers in the two rows of heat exchangers. The aforementioned second row of heat exchangers are connected, The flow path of the aforementioned indoor heat exchanger is formed with one passage. An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned outdoor unit is equipped with an expansion valve, The aforementioned indoor heat exchanger is provided with m rows of heat exchangers arranged with m rows of heat transfer tubes and n rows of heat exchangers arranged with n rows of heat transfer tubes, where m is an integer of 2 or more, n is an integer greater than 1 and smaller than m, The m rows of heat exchangers are arranged on the front side of the indoor unit, The n rows of heat exchangers are arranged on the back side of the indoor unit, During cooling operation, the expansion valve is connected to the n rows of heat exchangers via at least a part of the first row of the m rows of heat exchangers and at least a portion of the second row of the m rows of heat exchangers , The flow path of the aforementioned indoor heat exchanger is formed with one passage. An air conditioner is an air conditioner with an indoor unit and an outdoor unit, and is characterized by: The aforementioned indoor unit is equipped with an indoor heat exchanger, The aforementioned outdoor unit is equipped with an expansion valve, The aforementioned indoor heat exchanger is provided with m rows of heat exchangers arranged with m rows of heat transfer tubes, the first n rows of heat exchangers arranged with n rows of heat transfer tubes, and n rows of heat exchangers. The second n-row heat exchanger of the heat pipe, where m is an integer greater than 2 and n is an integer greater than 1 and smaller than m, The m rows of heat exchangers are arranged on the front side of the indoor unit, The first n-row heat exchanger is arranged below the m-row heat exchanger, The second n-row heat exchanger is arranged on the back side of the indoor unit, During the cooling operation, the expansion valve is heat-exchanged with the first n rows via at least a part of the first row of the m rows of heat exchangers and at least a portion of the second row of the m rows of heat exchangers And the aforementioned second n-row heat exchanger for connection, The flow path of the aforementioned indoor heat exchanger is formed with one passage.

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