JPH08327080A - Air conditioner - Google Patents

Abstract

PURPOSE: To prevent a dripping of water from being carried out on a cross-flow fan by a method wherein the number of rows of heat exchanging tubes of an indoor heat exchanger is set such that the number of rows of heat exchanging tubes in a heat exchanger installed at an upper side is made to be lower than the number of heat exchanging tubes of a heat exchanger placed at the most near lower side of a cross-flow fan. CONSTITUTION: A first indoor heat exchanger 4 is placed at a lower side near a cross- flow fan 2, and a second indoor heat exchanger 7 is placed at an upper side which is a far position from a cross-flow fan 2. The number of rows of heat exchanging tubes 7a of the second indoor heat exchanger 7 is set to be lower than the number of rows of heat exchanging tubes 4a of the first indoor heat exchanger 4. Drain condensed by the first indoor heat exchanger 4 is positively received by a first drain pan 3, drain condensed in the second indoor heat exchanger 7 is reduced in correspondence with the less number of rows of the heat exchanging tubes 7a of the second indoor heat exchanger 7 in view of its volume, the volume does not reach such an amount of overflowed drip against its flowing-down action, but the flow is positively flowed down onto the first indoor heat exchanger 4, and the flow is flowed down into the first drain pan 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner, and more particularly to an indoor unit thereof.

[0002]

2. Description of the Related Art FIG. 8 is a schematic side sectional view of an indoor unit of a conventional air conditioner. The main components are a casing 1, a cross flow fan 2, a first drain pan 3, a first indoor heat exchanger 4,
The second indoor heat exchanger 5 comprises an arrow 6 which indicates the flow of air flow. When an outdoor unit (not shown) is connected to this indoor unit to perform a cooling operation, the first indoor heat exchanger 4 and the second indoor heat exchanger 5 serve as evaporators, and water in the air is condensed and attached. . The attached water is collected as drainage directly in the first drain pan 3 in the case of the first indoor heat exchanger 4, and in the case of the second indoor heat exchanger 5 it travels through the first indoor heat exchanger 4 in the first drain pan 3 Is configured to be recovered.

[0003]

The above conventional air conditioner has the following problems to be solved.

That is, in the conventional indoor unit of the air conditioner, when the second indoor heat exchanger 5 has a large inclination angle, the drainage condensed during cooling can be surely flowed above the first indoor heat exchanger 4. However, there was a problem in that it could not be done and dripping onto the cross flow fan 2 occurred.

Further, the second indoor heat exchanger 5 is separated from the cross flow fan 2, the speed of the air passing therethrough is slow, the water content is likely to be condensed, and the amount of drain is large, which further promotes the above-mentioned problems. There was also the problem that it would be done.

An object of the present invention is to provide an air conditioner that solves the above problems.

[0007]

The present invention is intended to provide an air conditioner described in the following (1) to (10) as a means for solving the above problems.

(1) An indoor heat exchanger equipped with a drain pan is installed on the upstream side of the air flow path, a cross flow fan is installed on the downstream side thereof, and the indoor heat exchanger is vertically moved. In an air conditioner that is divided into two or more parts or is bent and is installed so that a heat exchanger located on the upper side covers the upper side of the cross flow fan, a heat exchange tube of the indoor heat exchanger The number of rows of heat exchange tubes of the heat exchanger located on the upper side is smaller than the number of rows of heat exchange tubes of the heat exchanger located on the lower side closest to the cross flow fan. An air conditioner.

(2) In the air conditioner described in (1) above, the heat exchanger located on the upper side is divided or bent into two or more and installed in a mountain shape so as to surround the upper side of the cross flow fan. An air conditioner characterized by

(3) In the air conditioner according to the above (2), a second drain pan is provided below the heat exchanger located on the lower side among the heat exchangers installed in a mountain shape. An air conditioner characterized by being provided.

(4) In the air conditioner described in (1) above, the pitch of the heat exchange tubes of the heat exchanger located on the upper side is made larger than that of the heat exchanger located on the lower side. A characteristic air conditioner.

(5) In the air conditioner described in (1) above, the thickness dimension of the heat exchanger located on the upper side along the air flow direction is made smaller than that of the heat exchanger located on the lower side. An air conditioner characterized by becoming.

(6) In the air conditioner described in (1) above, the front row of the heat exchangers located on the lower side through the heat exchangers located on the upper side when the refrigerant is cooled with respect to the indoor heat exchanger An air conditioner characterized in that the flow path is configured so that it flows in from the lower part, flows out from the lower part of the rear row, and flows in the opposite direction during heating.

(7) In the air conditioners described in (1) and (2) above, the refrigerant is divided into two circuits to flow into the heat exchanger located on the upper side and the heat exchanger located on the lower side. An air conditioner characterized by having such a flow path configuration.

(8) In the air conditioner described in (7) above, the refrigerant flows into the heat exchanger located on the lower side from the lower part of the front row and flows out from the lower part of the rear row during cooling. An air conditioner characterized in that the flow path is configured so that it flows in the opposite direction when flowing and heating.

(9) In the air conditioner described in (1) above, a heat exchanger located on the upper side and a heat exchanger located on the lower side are connected in series, and a throttle mechanism is provided between both heat exchangers. And an on-off valve connected in parallel to the air conditioner.

(10) In the air conditioner according to (9), the flow path is configured so that the refrigerant flows from the heat exchanger located on the upper side during cooling and dehumidification. .

[0018]

Since the present invention is constructed as described above, it has the following actions.

(1). In the configuration of (1) above, the number of rows of the heat exchange tubes of the indoor heat exchanger is set to be larger than that of the heat exchange tubes of the lower heat exchanger closest to the crossflow fan. Since the number of rows of heat exchange tubes is reduced, the drainage of the upper heat exchanger caused by dew condensation on the surface of the heat exchange tubes is reduced, and the phenomenon of overflow and dripping without falling down does not occur. No drain drops on the fan.

Further, since the number of rows of heat exchange tubes in the upper heat exchanger is less than that in the lower heat exchanger, the air in the upper heat exchanger passes better than before, and from this point as well, the upper heat exchanger The drainage of the vessel is better reduced and there is no downward drainage.

(2). In the configuration of (2) above, the heat exchanger on the upper side of the configuration of (1) above is divided or bent into two or more, and is formed in a mountain shape so as to surround the upper side of the cross flow fan. The number of rows of heat exchange tubes of the heat exchanger on the upper side where there is a possibility that the drain may drip on the flow fan is further reduced, and the action of the above (1) can be more reliably exhibited.

(3). In the configuration of (3) above, of the upper side heat exchangers installed in the mountain configuration of (2) above, a second drain pan is provided under the heat exchanger on the side far from the lower side heat exchanger. Since the drain is provided, even if the drain flows down from the heat exchanger received by the drain pan, it is received by the drain pan and does not drip downward.

(4). In the configuration of (4) above, since the pitch of the heat exchange tubes of the heat exchanger on the upper side of the configuration of (1) above is configured to be larger than that of the heat exchanger on the lower side, heat exchange on the lower side The air passage is better than the container,
The action of (1) above can be more reliably exhibited.

(5). In the configuration of (5) above, since the thickness dimension along the air flow direction of the heat exchanger on the upper side of the configuration of (1) is made smaller than that of the heat exchanger on the lower side, the weight is reduced. Material savings are achieved.

(6). In the configuration of (6) above, during cooling, the refrigerant flows from the lower part of the front row of the lower heat exchanger through the upper heat exchanger of the configuration of (1) and flows out from the lower part of the rear row. Since the flow path is configured so that the refrigerant flows in the opposite direction during heating, the entire heat exchange tube of the upper heat exchanger contributes to dehumidification during cooling and passes without being dehumidified. There is no air. That is, dehumidification is properly performed.

Further, during heating, the refrigerant flows in from the lower part of the rear row of the heat exchanger on the lower side and flows out from the lower part of the heat exchanger on the upper side, so that the inlet and the outlet are not adjacent to each other and the outlet is heated. There is no.

Furthermore, when a non-azeotropic mixed refrigerant is used as the refrigerant, the heat exchanger on the lower side has a counter flow, so that the temperature difference between the refrigerant and the air is secured and the heat exchange performance is high.

(7). In the above configuration (7), since the flow path is configured to flow the refrigerant in two circuits to each of the upper and lower heat exchangers in the configurations (1) and (2), The same effects as the above (1) and (2) are more remarkably exhibited.

(8). In the above configuration (8), the refrigerant flows into the lower heat exchanger of the above configuration (7) from the lower front row of the heat exchanger during cooling, and flows out from the lower rear row of the heat exchanger. Since the flow path is configured so as to flow in the opposite direction during heating, the same effect as (7) above can be more sufficiently exhibited.

(9). In the configuration of (9) above, the upper and lower heat exchangers of the configuration of (1) are connected in series, and the throttle mechanism and the on-off valve are arranged in parallel between the two heat exchangers. Since it is connected, when cooling, the throttling mechanism is closed, the on-off valve is opened, and the upper and lower heat exchangers, in particular, the refrigerant is passed in series through each heat exchange tube, cooling is achieved. At the time of dehumidification, for example, the on-off valve is closed, the throttle mechanism is opened, and the refrigerant flowing through the upper heat exchanger expands (the temperature drops) by the throttle mechanism and flows out through the lower heat exchanger. By doing so, the air is heated in the upper heat exchanger, and the air is cooled and dehumidified in the lower heat exchanger, so that dehumidification is achieved at an appropriate temperature as a whole.

(10). In the configuration of (10) above, since the flow path is configured to allow the refrigerant to flow from the heat exchanger on the upper side of the configuration of (9) during cooling and dehumidification, the action of (9) can be reliably achieved. To be

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First to seventh embodiments of the present invention will be described with reference to FIGS. Since all the drawings are side sectional views of the air conditioner, the description of the drawings is omitted after the second embodiment. Further, the same components as those in the conventional example or the previous example are designated by the same reference numerals, and the description thereof will be omitted unless necessary.

(First Embodiment) A first embodiment will be described with reference to FIG.

FIG. 1 is a schematic side section of an air conditioner according to the present embodiment, 4 is a lower first indoor heat exchanger close to the same crossflow fan 2 as the conventional one, and 7 is a crossflow fan 2
The second indoor heat exchanger on the upper side, which is located farther away from the first indoor heat exchanger 4, is denoted by 4a, and 7a is less than the row of heat exchange tubes 4a of the first indoor heat exchanger 4. It is a heat exchange tube of the two indoor heat exchanger 7. Other configurations are similar to those of the conventional example.

Next, the operation of the above configuration will be described.

The drain condensed in the first indoor heat exchanger 4 is surely received by the first drain pan 3. In addition, the amount of drain condensed in the second indoor heat exchanger 7 decreases as the number of rows of the heat exchange tubes 7a of the second indoor heat exchanger 7 decreases, and the amount of drain overflows to the downflow and drops. It does not reach, and it surely flows down onto the first indoor heat exchanger 4 and flows down into the first drain pan 3 for processing.

Further, as shown in FIG. 1, since the number of rows of the heat exchange tubes 4a of the first indoor heat exchanger 4 close to the cross flow fan is large, the first indoor heat exchanger 4 and the second indoor heat exchanger 7 are arranged. The velocity of the air flow is almost uniform.

(Second Embodiment) A second embodiment will be described with reference to FIG.

As shown in FIG. 2, this embodiment is an example in which the first indoor heat exchanger 8 has three rows of heat exchange tubes 8a and the second indoor heat exchanger 9 has two rows of heat exchange tubes 9a. The function and effect are basically the same as those of the first embodiment.

(Third Embodiment) A third embodiment will be described with reference to FIG.

As shown in FIG. 3, this embodiment shows an example in which the indoor heat exchanger is divided into three. Similarly to the second indoor heat exchanger 7, the third indoor heat exchanger 11 is arranged in one row in a slanted manner on the upper back side of the indoor unit, and the drain during cooling operation is used as the second drain pan 10.
It was designed to be received at. Also in the case of this embodiment, the first
The same operational effect as the embodiment is achieved.

(Fourth Embodiment) A fourth embodiment will be described with reference to FIG.

As shown in FIG. 4, this embodiment shows an example in which the second indoor heat exchanger 12 has a structure in which the thickness dimension 17 along the air flow direction is increased. In the case of the present embodiment, the air resistance with the first heat exchanger 4 can be adjusted not only by the number of rows of the heat exchange tubes 12a but also by increasing the pitch between the tubes. The dew treatment and the operation effect during the cooling operation are the same as those in the first embodiment.

(Fifth Embodiment) A fifth embodiment will be described with reference to FIG.

This embodiment is an example in which the first embodiment is used as a basic structure to change the flow of the refrigerant to improve performance and add a dehumidifying function.

In FIG. 5, 13 is an arrow showing the flow of the refrigerant during the cooling operation, and 14 is an arrow (broken line) showing the flow of the refrigerant during the heating operation. During the cooling operation, the refrigerant enters from the lower part of the second indoor heat exchanger 7 and exits from the upper part of the second indoor heat exchanger 4
It is configured so that it enters from the lower front row and makes a U-turn at the upper part, and exits from the lower rear row. Also, during heating operation, the first indoor heat exchanger 4 is configured to enter from the lower rear row, make a U-turn at the upper portion, exit from the lower front row, enter from the upper portion of the second indoor heat exchanger 7, and exit from the lower portion. There is. Due to this way of flowing the refrigerant, the entire one-row coil portion of the second indoor heat exchanger 7 becomes a wet coil during the cooling operation, and the bypass of undehumidified air is eliminated. Further, during the heating operation, the lower rear row of the first indoor heat exchanger 4 that is the condenser inlet portion and the lower portion of the second indoor heat exchanger 7 that is the outlet portion are not adjacent to each other, and the outlet portion may be heated. Absent. Further, when a non-azeotropic mixed refrigerant is used as the refrigerant, there is an advantage that the first indoor heat exchanger 4 has a counter flow and a temperature difference between the refrigerant and the air can be secured, and the heat exchange performance can be improved.

(Sixth Embodiment) A sixth embodiment will be described with reference to FIG.

This embodiment is an example in which the third embodiment in which the third indoor heat exchanger 11 is arranged on the back side of the indoor unit is used as the basic structure to change the flow of the refrigerant, and during the cooling operation and the heating operation. Both 2
It is a circuit. During the cooling operation, the refrigerant enters from the lower part of the front row of the first indoor heat exchanger 4 and the lower part of the second indoor heat exchanger 7, and exits from the lower part of the rear row of the first indoor heat exchanger 4 and the lower part of the third indoor heat exchanger 11. It has become. During heating operation, as indicated by arrow 14, the flow is opposite to that during cooling operation.

Also in the case of the present embodiment, as in the case of the fifth embodiment, when the refrigerant is a non-azeotropic mixed refrigerant, the first indoor heat exchanger 4 becomes a counter flow during the heating operation, and the temperature difference between the air and the refrigerant can be secured. It has the advantage that it is operated and the heat exchange performance is improved.

(Seventh Embodiment) A seventh embodiment will be described with reference to FIG.

The present embodiment is an example in which the dehumidifying operation is made possible by using the third embodiment as a basic structure. In FIG. 7, 13a is an arrow indicating the flow of the refrigerant during the cooling operation and the dehumidifying operation, and 15
Is a throttle mechanism, and 16 is an opening / closing valve.

During the cooling operation, the opening / closing valve 16 is opened, and the refrigerant enters from the lower portion of the third indoor heat exchanger 11, passes through the second indoor heat exchanger 7 and the opening / closing valve 16, and enters from the front side of the lower portion of the first indoor heat exchanger 4. Enter, and exit from the lower rear side.

During the dehumidifying operation, the on-off valve 16 is closed and the throttle mechanism 15 is set to a predetermined opening. The refrigerant enters from the lower part of the third indoor heat exchanger 11, is condensed in the third indoor heat exchanger 11 and the second indoor heat exchanger 7, is expanded by expansion by the expansion mechanism 15, and is evaporated by the first indoor heat exchanger 4. . Here, air is heated in the second indoor heat exchanger 7 and the third indoor heat exchanger 11,
In the first indoor heat exchanger 4, the air is cooled and dehumidified so that dehumidifying operation can be performed.

This embodiment has an advantage that the drain does not drip from the second indoor heat exchanger 7 during both the cooling operation and the dehumidifying operation.

As described above, according to the first to seventh embodiments, the second indoor heat exchanger farther from the cross flow fan 2 than the number of rows of the heat exchange tubes 4a and 8a of the first indoor heat exchangers 4 and 8. Since the number of rows of the heat exchange tubes 7a, 9a, 12a of 7, 9, 12 is reduced, the drain amount of the second indoor heat exchanger 7, 9 and 12 on the upper side is small and the drain is on the lower side during the cooling operation. There is an advantage that the problem of properly flowing down to the first indoor heat exchanges 4 and 8 and not overflowing and dropping onto the cross flow fan 2 unlike the conventional case does not occur.

Further, the row of heat exchange tubes of the second indoor heat exchangers 7, 9, 12 on the upper side farther from the crossflow fan 2 than the first indoor heat exchangers 4, 8 on the lower side near the crossflow fan 2 are There is an advantage that the above-mentioned advantage is further assisted by suppressing an increase in the amount of drain, which is sparse and easily allows air to flow therethrough and causes insufficient inflow due to the distance from the cross flow fan 2.

Further, according to the fifth and sixth embodiments, in addition to the same advantages as those of the first to fourth embodiments during cooling, when the non-azeotropic mixed refrigerant is used during heating, the first indoor heat Exchanger 4
The counter flow is provided, and the temperature difference between the refrigerant and the air can be secured, and the heat exchange performance is improved.

In the case of the seventh embodiment, the diaphragm mechanism 15,
The combined use of the on-off valve 16 has an advantage that no drain is dropped from the upper second indoor heat exchanger 7 during both the cooling operation and the dehumidifying operation.

[0059]

The present invention has the following effects because it is configured as described above.

(1) By reducing the number of rows of heat exchange tubes of the indoor heat exchanger on the upper side farther from the cross flow fan from the number of rows of heat exchange tubes of the indoor heat exchanger on the lower side, the indoor heat on the upper side is The amount of dehumidification of the exchanger is reduced, and it is possible to prevent the drain from dripping onto the cross flow fan. In addition, the velocity of the airflow passing through the lower and upper indoor heat exchangers can be made uniform.

(2) The heat exchange performance is improved in a system using a non-azeotropic mixed refrigerant as a medium by making the air flow of the lower indoor heat exchanger and the refrigerant flow counter flows during heating operation.

(3) The number of rows of the heat exchange tubes of the upper indoor heat exchanger is made smaller than that of the lower indoor heat exchanger, and the row pitch of the heat exchange tubes of the upper indoor heat exchanger is made smaller. By increasing the size, the velocity of the airflow passing through the indoor heat exchangers on the lower side and the upper side can be made uniform.

(4) The heat transfer area of the indoor unit can be improved by bending the indoor heat exchanger on the upper side into two or more and disposing it so as to surround the cross flow fan.

(5) The lower side and upper side indoor heat exchangers are connected in series, and during the cooling operation, the primary air from the upper side indoor heat exchanger is caused by flowing the refrigerant from the upper side indoor heat exchanger. Bypass can be prevented.

(6) A cycle in which the indoor heat exchangers on the lower side and the upper side bent to two or more are connected in series, and a throttle mechanism and an on-off valve are used between the indoor heat exchangers on the lower side and the upper side. When the dehumidifying operation is performed at, the indoor heat exchanger on the upper side serves as a condenser, and the drain drop on the cross flow fan is eliminated.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view of an air conditioner according to a first embodiment of the present invention,

FIG. 2 is a schematic side sectional view of an air conditioner according to a second embodiment of the present invention,

FIG. 3 is a schematic side sectional view of an air conditioner according to a third embodiment of the present invention,

FIG. 4 is a schematic side sectional view of an air conditioner according to a fourth embodiment of the present invention,

FIG. 5 is a schematic side sectional view of an air conditioner according to a fifth embodiment of the present invention,

FIG. 6 is a schematic side sectional view of an air conditioner according to a sixth embodiment of the present invention,

FIG. 7 is a schematic side sectional view of an air conditioner according to a seventh embodiment of the present invention,

FIG. 8 is a schematic side sectional view of a conventional air conditioner.

[Explanation of symbols]

 1 Casing 2 Cross Flow Fan 3 First Drain Pan 4 First Indoor Heat Exchanger 4a Heat Exchange Tube 7 Second Indoor Heat Exchanger 7a Heat Exchange Tube 8 First Indoor Heat Exchanger 8a Heat Exchange Tube 9 Second Indoor Heat Exchanger 9a Heat exchange tube 10 Second drain pan 11 Third indoor heat exchanger 12 Second indoor heat exchanger 12a Heat exchange tube 15 Throttle mechanism 16 Open / close valve

Claims (10)

[Claims] 1. An indoor heat exchanger equipped with a drain pan at a lower part is installed upstream in an air flow path, a cross flow fan is installed downstream thereof, and the indoor heat exchanger is vertically moved. In an air conditioner that is divided or bent into two or more and the heat exchanger located on the upper side is installed so as to cover the upper side of the cross flow fan, the heat exchange tube of the indoor side heat exchanger is It is characterized in that the number of rows of heat exchange tubes of the heat exchanger located on the upper side is smaller than the number of rows of heat exchange tubes of the heat exchanger located on the lower side closest to the cross flow fan. Air conditioner. 2. The air conditioner according to claim 1, wherein the heat exchanger located on the upper side is divided or bent into two or more, and is installed in a mountain shape so as to surround the upper side of the cross flow fan. An air conditioner characterized by becoming. 3. The air conditioner according to claim 2, wherein among the heat exchangers installed in a mountain shape, a second drain pan is provided below the heat exchanger located on the side farther from the heat exchanger located on the lower side. An air conditioner characterized by becoming. 4. The air conditioner according to claim 1, wherein the pitch of the heat exchange tubes of the heat exchanger located on the upper side is
An air conditioner characterized by being made larger than that of the heat exchanger located on the lower side. 5. The air conditioner according to claim 1, wherein the thickness dimension of the heat exchanger located on the upper side in the air flow direction is smaller than that of the heat exchanger located on the lower side. An air conditioner characterized by. 6. The air conditioner according to claim 1, wherein, when the refrigerant is being cooled, the heat exchanger located on the upper side of the indoor heat exchanger is passed through the heat exchanger located on the lower side of the front row lower part of the heat exchanger located on the lower side. An air conditioner having a flow path structure that allows the air to flow in, flow out from the lower part of the rear row, and flow in the opposite direction during heating. 7. The air conditioner according to claim 1 or 2, wherein a flow passage configuration is provided so that the refrigerant is divided into two circuits to flow to the heat exchanger located on the upper side and the heat exchanger located on the lower side. An air conditioner characterized by 8. The air conditioner according to claim 7, wherein the refrigerant flows into the heat exchanger located on the lower side so as to flow from the lower part of the front row and out of the lower part of the rear row during cooling. An air conditioner characterized in that the flow path is configured to flow in the opposite direction during heating. 9. The air conditioner according to claim 1, wherein a heat exchanger located on the upper side and a heat exchanger located on the lower side are connected in series, and a throttle mechanism and an opening / closing mechanism are provided between both heat exchangers. An air conditioner characterized in that a valve and a parallel circuit are connected. 10. The air conditioner according to claim 9,
An air conditioner having a flow passage structure so that a refrigerant flows from a heat exchanger located on the upper side during cooling and dehumidification.