JPH11248290A - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide dehumidification operation which is close to a genuine reheating whole degradation of heating efficiency is suppressed. SOLUTION: An indoor heat exchanger comprises heat exchangers 22 and 23 which, provided windward, act as an evaporator at dehumidification operation, a heat exchanger 24 which, and provided leeward of the heat exchanger 23, acts as a reheater at dehumidification operation, and a heat exchanger 21 which, provided adjoining the heat exchanger 22, acts as a reheater at dehumidification operation. Since, a worm air from the heat exchanger 21 at high temperature, a chilled air from the heat exchanger 22 at low temperature, and an air from the heat exchanger 24 at near room temperature are sucked, in layer in a fan 33, 3 kinds of air is efficiently mixed, for dehumidification operation close to a genuine reheating while degradation of heating efficiency suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner capable of efficiently performing a dehumidifying operation while suppressing a decrease in heating efficiency.

[0002]

2. Description of the Related Art Conventionally, a dehumidifying operation (hereinafter referred to as a dry operation) performed to reduce indoor humidity is mainly performed by a weak cooling operation. In the dehumidification by the weak cooling operation, the saturated steam of the air is reduced by cooling the indoor air.

Therefore, if the dehumidified air is directly blown into the room, there is a problem that the room temperature is lowered. Further, when the room temperature approaches the set temperature or when the set temperature is high, the compressor enters an intermittent operation state, so that there is a problem that the dehumidifying efficiency is reduced.

[0004] From such a viewpoint, two heat exchangers are arranged side by side in the indoor unit such that one is on the leeward side and the other is on the leeward side. This is called full-scale reheating in which the air is cooled and dehumidified by acting as a heat exchanger, and the heat exchanger arranged on the leeward side is acted as a reheater to warm the air dehumidified and cooled by the evaporator and blow it indoors. A scheme has been proposed.

[0005] The reheater operates on the same principle as the condenser, but in order to reheat the air once cooled,
In this specification, it is described as a reheater, and in special cases, it shall be described.

[0006] Further, there is a system called an air mixing system in which two heat exchangers are arranged vertically adjacent to an indoor unit, and air passing through each heat exchanger is mixed and blown into the room. Proposed.

In such an air mix system, during the dry operation, one of the heat exchangers acts as an evaporator to obtain cooled and dehumidified cool air, and the other heats a reheater (in this case, the indoor air is directly warmed). ) To obtain warm air, mix these air, and send it indoors.

[0008]

However, in the full-scale reheating method, the refrigerant warmed by the heat exchanger on the windward side is supplied first from the heat exchanger on the windward side during the heating operation. When passing through the heat exchanger, there is a problem that heat is taken away by the heat exchanger on the downwind side and the heating efficiency is reduced.

On the other hand, the air mix system mixes cold air and warm air and blows air into the room. Therefore, when the mixing is not performed sufficiently, a temperature distribution occurs in the room, and the room becomes cold in some places. There is a problem that becomes humid elsewhere. The occurrence of such a temperature distribution becomes significant near the discharge port of the indoor unit.

Therefore, the present invention suppresses a decrease in the heating efficiency as in the full-scale reheating method, and reduces the discharge of air in which the mixture of the cool air and the warm air as in the air mix method is insufficient, thereby achieving a high efficiency. An object of the present invention is to provide an air conditioner capable of performing efficient and comfortable air conditioning.

[0011]

In order to solve the above-mentioned problems, the invention according to claim 1 is directed to an outdoor unit provided with a compressor for compressing a refrigerant, and a method in which the refrigerant from the outdoor unit and the indoor air are heated. In an air conditioner having an indoor unit having an indoor heat exchanger to be exchanged and a fan that draws air from the room, passes air through the indoor heat exchanger, and then blows the air into the room, the indoor heat exchanger is located on the windward side. And a first heat exchanger that functions as an evaporator during the dehumidifying operation, and that is smaller than the first heat exchanger and that is disposed on the leeward side of the first heat exchanger. A second heat exchanger acting as a reheater, and a position adjacent to the first heat exchanger and capable of passing indoor air that does not pass through the first heat exchanger, and acts as a reheater during the dehumidifying operation. Having a third heat exchanger for heating effect Characterized in that so as to perform efficient dehumidification operation without lowering the like.

According to a second aspect of the present invention, the second heat exchanger is disposed at a position where the amount of air passing through the first heat exchanger is largest, so that reheating can be performed efficiently. And

According to a third aspect of the present invention, there is provided a main decompression device for depressurizing or reducing the refrigerant during the cooling / heating operation, a bypass valve for opening and closing a bypass circuit so that the refrigerant bypasses the main decompression device during the dehumidification operation, By providing a dehumidifying decompression device in which the first heat exchanger acts as an evaporator and the second and third heat exchangers act as a reheater, the dehumidifying operation can be performed efficiently without lowering the heating efficiency. It is characterized in that it can be performed.

According to a fourth aspect of the present invention, the first heat exchanger and the second heat exchanger are connected by a refrigerant pipe, and the second heat exchanger and the third heat exchanger are connected by a refrigerant pipe. The pressure reducing device is provided in a refrigerant pipe connected to the first heat exchanger and the second heat exchanger.

According to a fifth aspect of the present invention, the refrigerant pipe and the first heat exchanger are connected so that the heat of the refrigerant flowing through the refrigerant pipe connecting the second heat exchanger and the third heat exchanger is not transmitted to the first heat exchanger. The heat exchanger is provided at a predetermined distance from the heat exchanger.

According to a sixth aspect of the present invention, the refrigerant pipe and the first
The distance from the heat exchanger is at least 10 cm or more.

[0017] The invention according to claim 7 is characterized in that the area of the front surface of the second heat exchanger is less than half the area of the front surface of the first heat exchanger.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an indoor unit of an air conditioner according to an embodiment, and FIG. 2 is a refrigerant circuit diagram of the air conditioner. The air conditioner mainly has an outdoor unit disposed outdoors and an indoor unit disposed indoors.

The outdoor unit includes a compressor 11 for compressing the refrigerant, an outdoor heat exchanger 12 for exchanging heat between the refrigerant and the outside air,
It has a main pressure reducing device 13 capable of adjusting the flow rate for reducing or reducing the refrigerant, a bypass valve 15 for controlling whether or not the refrigerant flows into the main pressure reducing device 13, and the like.

The indoor unit is provided with an indoor heat exchanger. The indoor heat exchangers are the first heat exchangers 22, 23 and the second heat exchanger, as shown in FIG. It is formed by the heat exchanger 24 and the heat exchanger 21 as the third heat exchanger, and is provided in the indoor unit.

The heat exchanger 21 and the heat exchanger 24 are connected by a refrigerant pipe 27, and the heat exchanger 24 is connected to the heat exchangers 22 and 23 via a dehumidifying decompression device 25.

Further, the heat exchanger 21 is connected to the main pressure reducing device 13 of the outdoor unit, and the heat exchangers 22 and 23 are connected to the compressor 11 via the four-way valve 16 of the outdoor unit. Refrigerant from the unit flows sequentially through the heat exchangers 22, 23, 24, 21 of the indoor unit.

The indoor unit is provided with a dehumidifying decompression device 25 and a fan 33. Further, a front suction port 31 is provided at the front of the indoor unit, an upper suction port 32 is provided at the upper surface, and a discharge port 34 is provided at the lower surface. Have been.

The main pressure reducing device 13 and the bypass valve 15
May be provided on the indoor unit side.

The heat exchangers 22 and 23 function as an evaporator during the cooling operation and the dry operation, and as a condenser during the heating operation.

The first heat exchanger is divided into heat exchangers 22 and 23 to make the indoor unit compact,
3 is provided on the front suction port 31 side, and the heat exchanger 22 is provided over the front suction port 22 and the upper suction port 32. However, this is not essential, and these are integrally formed. There may be.

The heat exchanger 23 is provided on the leeward side of the heat exchanger 23 where the heat exchanger 23 and the fan 33 are closest to each other, that is, where the amount of air passing through the heat exchanger 23 is the largest. The heat exchanger 24 and the heat exchanger 21 provided on the upper surface suction port 32 side function as an evaporator during the cooling operation, as a condenser during the heating operation, and as a reheater during the dry operation.

At this time, the heat exchanger 23 and the heat exchanger 24 are arranged at a predetermined distance from each other, and the air is
3 flows toward the heat exchanger 24, even if the heat exchanger 24 acts as a reheater during the dry operation, the heat of the heat exchanger 24 becomes difficult to be transmitted to the heat exchanger 23, and the heat exchange The reduction of the condensation efficiency in the vessel 23 can be suppressed.

Further, since the heat exchanger 24 is provided at the place where the amount of indoor air passing is the largest, the indoor air can be efficiently reheated during the dry operation even if the heat exchanger 24 is small.

In order to suppress a decrease in the heating capacity during the heating operation while efficiently reheating during the dry operation, the surface area on the windward side of the heat exchanger 24 is limited to the first heat exchanger 2.
30% to 50% of the surface area on the windward side of 2,23 is suitable.

Next, a detailed configuration will be described while explaining the operation. During the cooling operation, the bypass valve 15 is closed, the main pressure reducing device 13 is opened by a predetermined amount, the dehumidifying pressure reducing device 25 is fully opened, and the refrigerant is circulated by the four-way valve 16 in the direction indicated by the solid line arrow.

The refrigerant which has been compressed by the compressor 11 to become a hot gas is supplied to the outdoor heat exchanger 12 and exchanges heat with the outside air in the outdoor heat exchanger 12 to be condensed. At this time, since the bypass valve 15 is closed, the condensed refrigerant is decompressed or throttled by the main decompression device 13 to be supplied to the indoor unit as a liquid-gas mixed refrigerant.

The refrigerant supplied to the indoor unit sequentially flows through the heat exchangers 21, 24, 23 and 22. At this time, since the dehumidifying decompression device 25 is fully opened, the refrigerant that has passed through the heat exchanger 24 is directly supplied to the heat exchangers 22 and 23, returns to the compressor 11, and one cycle ends.

Therefore, the heat exchangers 21 to 24 all function as evaporators, and can efficiently cool the sucked air.

During the heating operation, the bypass valve 15 is closed, the main pressure reducing device 13 is opened by a predetermined amount, the dehumidifying pressure reducing device 25 is fully opened, and the refrigerant is circulated by the four-way valve 16 in the direction indicated by the dotted arrow. I do.

The hot gas from the compressor 11 is sequentially supplied to the heat exchangers 22 and 23 of the indoor unit, and sequentially circulates through the heat exchangers 24 and 21 via the dehumidifying decompression device 25.

Since the dehumidifying decompression device 25 is fully opened, all the heat exchangers 21 to 24 function as condensers.

In this case, the refrigerant is supplied to the heat exchangers 22, 23,
Since the heat exchangers 24 and 21 are sequentially circulated, the heat exchangers 22 and 23 are warmer than the heat exchangers 21 and 24.

Therefore, the air warmed through the heat exchanger 23 is deprived of heat by the heat exchanger 24.
Since the air heated through the heat exchanger 22 is not deprived of heat in this way, it is possible to improve the heating efficiency as compared with the full-scale reheating system.

As described above, the refrigerant is supplied to the heat exchanger 2
2, 23, 24, and 21 are sequentially circulated, so that the heat of the refrigerant supplied to the heat exchanger 24 is compared with a case where the refrigerant is sequentially circulated through the heat exchangers 22, 23, 21, and 24, for example. And the heat of the air from the heat exchanger 23 taken away by the heat exchanger 24 can be reduced.

At the time of the dry operation, the bypass valve 15 is fully opened, the main pressure reducing device 13 is fully closed, the dehumidifying pressure reducing device 25 is opened by a predetermined amount, and the refrigerant is supplied by the four-way valve 16 by a dashed line arrow. Circulates in the direction indicated by.

The refrigerant that has become hot gas from the compressor 11 exchanges heat with the outside air in the outdoor heat exchanger 12 to be condensed, and is sequentially supplied to the heat exchangers 21 and 24 via the bypass valve 15.

The refrigerant from the heat exchanger 24 is substantially adiabatically expanded by the dehumidifying decompression device 25 to become a low-temperature liquid-gas mixed refrigerant, which is supplied to the heat exchangers 22 and 23 sequentially.

Thus, the cold air which has passed through the heat exchanger 23 and cooled and dehumidified passes through the heat exchanger 24 and is warmed. On the other hand, the air that has passed through the heat exchanger 22 is cooled and dehumidified to become cool air, and the air that has passed through the heat exchanger 21 is warmed and becomes warm air.

Therefore, the warm air from the heat exchanger 21 having a high temperature, the cool air from the heat exchanger 22 having a low temperature, and the air from the heat exchanger 24 having a temperature substantially at room temperature form a layer in the fan 33. So that mixing can be performed efficiently.

In particular, the fan 33 is connected to each heat exchanger 21
Since the cross-flow fan extends in the longitudinal direction of up to 24, the three kinds of air forming the layer are mixed in the layer in the vertical direction, so that the mixing effect is high.

Therefore, air with a uniform temperature can be blown into the room as compared with the case of the air mix system, and a comfortable dry operation can be performed.

The refrigerant from the heat exchanger 21 is supplied to the heat exchanger 24 via the refrigerant pipe 27. Since the warm refrigerant flows through the refrigerant pipe 27 as described above, It is preferable to separate the heat exchangers 22 and 23 from the heat exchangers 22 and 23 so that the heat exchangers 22 and 23 are not heated by the heat of the heat exchanger. It is preferable that they are separated from each other.

The refrigerant circulated to the heat exchanger 22 as described above returns to the compressor 11 via the four-way valve 16 and makes one cycle.

[0050]

As described above, according to the first aspect of the present invention, the first heat exchanger which is disposed on the windward side of the indoor heat exchanger and functions as an evaporator during the dehumidifying operation is provided. A second heat exchanger that is smaller than the first heat exchanger and that is disposed downstream of the first heat exchanger and that acts as a reheater during the dehumidifying operation; The third heat exchanger is provided at a position where room air that does not pass through the first heat exchanger can pass therethrough, and acts as a reheater during the dehumidifying operation.
Since it is constituted by the heat exchanger, the dehumidifying operation can be performed efficiently without lowering the heating efficiency and the like.

According to the second aspect of the present invention, since the second heat exchanger is disposed at the position where the amount of air passing through the first heat exchanger is largest, reheating can be performed efficiently.

According to the third aspect of the invention, the bypass valve for opening and closing the bypass circuit and the first heat exchanger function as an evaporator so that the refrigerant bypasses the main pressure reducing device during the dehumidifying operation, and the second and the second heat exchangers are operated. (3) Since the dehumidifying depressurizing device or the like that makes the heat exchanger function as a reheater is provided, the dehumidifying operation can be performed efficiently without lowering the heating efficiency and the like.

According to the fourth aspect of the present invention, the first heat exchanger, the second heat exchanger, and the third heat exchanger are sequentially connected by the refrigerant pipe, and the dehumidifying decompression device is connected to the first heat exchanger and the first heat exchanger. Since it is provided between the two heat exchangers, the dehumidifying operation can be performed efficiently without lowering the heating efficiency and the like.

According to the fifth aspect of the invention, the heat of the refrigerant flowing through the refrigerant pipe connecting the second heat exchanger and the third heat exchanger is not transmitted to the first heat exchanger. The first and second heat exchangers can function efficiently.

According to the invention according to claim 6, the distance between the refrigerant pipe connecting the second heat exchanger and the third heat exchanger and the first heat exchanger is at least 10 cm or more. The heat of the flowing refrigerant is not transmitted to the first heat exchanger, and the first and second heat exchangers can function efficiently.

According to the seventh aspect of the present invention, the area of the front surface of the second heat exchanger is reduced to less than half of the area of the front surface of the first heat exchanger, so that the heating efficiency and the like can be efficiently reduced. Dehumidification operation can be performed.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an indoor unit applied to an embodiment of the present invention.

FIG. 2 is a refrigerant circuit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Compressor 12 Outdoor heat exchanger 13 Main decompression device 15 Bypass valve 21 Heat exchanger (3rd heat exchanger) 22, 23 Heat exchanger (1st heat exchanger) 24 Heat exchanger (2nd heat exchanger) 25 Dehumidifying decompression device 31 Front intake port 32 Top intake port 33 Fan 34 Discharge port

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yugo Tomami 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd.

Claims (7)

[Claims] An outdoor unit having a compressor for compressing a refrigerant; an indoor heat exchanger for exchanging heat between the refrigerant from the outdoor unit and indoor air; In the air conditioner having an indoor unit having a fan that blows the air into the room after the air is passed, the indoor heat exchanger is disposed on the windward side and operates as an evaporator during the dehumidifying operation. A second heat exchanger that is smaller than the first heat exchanger and that is located downstream of the first heat exchanger and that acts as a reheater during the dehumidifying operation; An air conditioner provided with a third heat exchanger adjacent to the heat exchanger and capable of passing indoor air that does not pass through the first heat exchanger, and acting as a reheater during the dehumidifying operation. . 2. The air conditioner according to claim 1, wherein the second heat exchanger is disposed at a position where the amount of air passing through the first heat exchanger is largest. 3. A main decompression device for depressurizing or throttling a refrigerant during a cooling / heating operation, a bypass valve for opening a bypass circuit so that the refrigerant bypasses the main decompression device during a dehumidification operation, and a first heat exchanger during a dehumidification operation. The air conditioner according to claim 1 or 2, further comprising: a dehumidifying depressurizing device that functions as an evaporator and the second and third heat exchangers function as a reheater. 4. The dehumidifying decompression device, wherein the first heat exchanger and the second heat exchanger are connected by a refrigerant pipe, and the second heat exchanger and the third heat exchanger are connected by a refrigerant pipe. 4. The air conditioner according to claim 3, wherein a refrigerant pipe connected to the first heat exchanger and the second heat exchanger is provided. 5. The refrigerant pipe and the first heat exchanger so that heat of the refrigerant flowing through the refrigerant pipe connecting the second heat exchanger and the third heat exchanger is not transmitted to the first heat exchanger. The air conditioner according to any one of claims 1 to 4, wherein the exchanger is provided at a predetermined distance from the exchanger. 6. The air conditioner according to claim 5, wherein a distance between the refrigerant pipe and the first heat exchanger is at least 10 cm or more. 7. The air conditioner according to claim 1, wherein the area of the front surface of the second heat exchanger is less than half the area of the front surface of the first heat exchanger. .