JPH07103621A - Air-conditioning device - Google Patents

Abstract

PURPOSE:To provide an air-conditioning device which does not impair comfortableness by controlling a defrosting operation only for a frosted part while continuing a heating operation for an unfrosted part. CONSTITUTION:A first and second outdoor heat exchangers 51, 52 which are connected in series are provided, and a second throttling/switching means 41 interconnecting the first and second outdoor heat exchangers, and a first throttling/switching means 40, and first and second fans 71, 72 provided respectively corresponding to the first and second outdoor heat exchangers are controlled. By this method, when the heat exchanger 51 on the inlet side has frosted, a heating operation can be continued by the heat exchanger 52, while controlling a defrosting operation of the outdoor heat exchanger on the inlet side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner using a non-azeotropic mixed refrigerant.

[0002]

2. Description of the Related Art As an air conditioner using a non-azeotropic mixed refrigerant of this type, there is one having a refrigeration cycle as shown in FIG. In FIG. 5, the outdoor unit 1 is composed of main components such as a compressor 2, a four-way valve 3, an expansion valve 4, an outdoor heat exchanger 5, an outdoor heat exchanger temperature sensor 6, and the indoor unit 10 is an indoor heat exchanger. It is composed of main parts such as the container 11.

In the conventional air conditioner thus constructed, in the heating operation, the high-temperature and high-pressure refrigerant gas compressed by the compressor 2 is guided to the indoor unit 10 after passing through the four-way valve 3. While flowing through the heat exchanger 11, it exchanges heat with the indoor air by an indoor blower (not shown), so that heat is released into the room and condensed. Then, the liquefied refrigerant returns to the outdoor unit 1, is decompressed by the expansion valve 4, and then exchanges heat with the outdoor air by an outdoor blower (not shown) in the outdoor heat exchanger 5 to complete the evaporation process. The heated refrigerant gas enters the compressor 2 again,
The high-temperature high-pressure refrigerant gas is discharged and discharged, and one cycle during heating is completed. When the outdoor heat exchanger 5 is frosted at a low outdoor temperature, the expansion valve 4 loosens the throttle to remove the frost from the outdoor heat exchanger 5.

In the above-mentioned air conditioner, when a non-azeotropic mixed refrigerant is evaporated at a constant pressure, unlike a single refrigerant, the composition of the refrigerant changes as it evaporates.
Evaporation temperature rises. Therefore, even if the pressure inside the outdoor heat exchanger 5 which is an evaporator is constant, the temperature of the inlet portion 5a near the expansion valve 4 becomes lower than the temperature of the outlet portion 5b near the four-way valve 3. To do. As a result, during the heating operation, it freezes from the inlet portion 5a of the outdoor heat exchanger 5 and frost adheres to it, and the effective area of the heat exchanger that can be used as an evaporator decreases with the passage of time. As shown, it will cause a decline in ability. Then, the defrosting operation is performed in order to remove the attached frost. When the defrosting operation is started during the heating operation, the blowout temperature and the room temperature are lowered.

As a conventional device for reducing such a phenomenon, for example, Japanese Patent Application Laid-Open No. 60-93265 discloses that an evaporator is divided into two parts, and a throttle and an opening / closing mechanism are provided in the middle of connecting pipes for both. However, this conventional device is a natural convection evaporator.

[0006]

As described above, in the air conditioner using the non-azeotropic mixed refrigerant, the temperature of the inlet of the outdoor heat exchanger, which is the evaporator, becomes lower than the temperature of the outlet thereof. As a result, frost adheres, which often causes defrosting operation, which causes a decrease in heating capacity. Then, a method of dividing the evaporator into two parts has been conventionally proposed in order to reduce such a phenomenon. However, this conventional method is a natural convection method, and there is a problem that the effect is very thin.

The present invention has been made in view of the above,
The purpose is to defrost control only the frozen part, and to keep the heating operation in the non-frozen part,
An object is to provide an air conditioner that does not impair comfort.

[0008]

In order to achieve the above object, an air conditioner of the present invention includes an outdoor unit having a compressor, a four-way valve, a first throttle / opening / closing means and an outdoor heat exchanger, and indoor heat exchange. An indoor unit having an air conditioner, and an air conditioner using a non-azeotropic mixed refrigerant as a refrigerant, wherein the outdoor heat exchanger includes first and second outdoor heat exchangers connected in series. A second throttle / opening / closing means having a throttle mechanism and an opening / closing function is connected between the first and second outdoor heat exchangers, and each of the first and second outdoor heat exchangers is connected to the first and second outdoor heat exchangers. Having an air volume control means for controlling the air volume,
By controlling the first and second throttle / opening / closing means and the air volume control means, the outdoor heat exchanger on the inlet side of the first and second outdoor heat exchangers connected in series is frozen. In this case, the gist is that the heating operation can be continued by the other outdoor heat exchanger while defrosting the outdoor heat exchanger on the inlet side.

Further, the air conditioner of the present invention comprises a compressor,
An outdoor unit having a four-way valve, a first throttle / opening / closing means and an outdoor heat exchanger, and an indoor unit having an indoor heat exchanger,
An air conditioner using a non-azeotropic mixed refrigerant as a refrigerant, wherein the outdoor heat exchanger has first and second outdoor heat exchangers connected in series, and the first and second outdoor heat exchangers are connected in series. A second throttling / opening / closing means having a throttling mechanism and an opening / closing function is connected between the outdoor heat exchangers, and the first and second outdoor heat exchangers can be controlled so as to control an air flow rate to each of the first and second outdoor heat exchangers. And second outdoor heat exchangers respectively provided with corresponding first and second blowing fans, and the first and second throttle / opening / closing means and the first and second blowing fans. When the outdoor heat exchanger on the inlet side of the first and second outdoor heat exchangers connected in series is frozen, the outdoor heat exchanger on the inlet side is defrost-controlled by controlling However, the heating operation can be continued by the other outdoor heat exchanger. And summarized in that can.

Further, the air conditioner of the present invention comprises a compressor,
An outdoor unit having a four-way valve, a first throttle / opening / closing means and an outdoor heat exchanger, and an indoor unit having an indoor heat exchanger,
An air conditioner using a non-azeotropic mixed refrigerant as a refrigerant, wherein the outdoor heat exchanger has first and second outdoor heat exchangers connected in series, and the first and second outdoor heat exchangers are connected in series. A blowing mechanism for connecting a second throttling / opening / closing means having a throttling mechanism and an opening / closing function between the outdoor heat exchangers, and controlling the air blowing to the first and second outdoor heat exchangers, and the first and the second blowing means. Of the two outdoor heat exchangers, there is provided louver means for variably controlling the air blowing from the air blowing means to the outdoor heat exchanger on the inlet side, and the first and second throttle / opening / closing means, the air blowing means, and the By controlling the louver means, when the outdoor heat exchanger on the inlet side of the first and second outdoor heat exchangers connected in series is frozen, the outdoor heat exchanger on the inlet side is defrosted. Controlling the other outdoor heat exchanger And summarized in that it is possible to continue a more heating operation.

[0011]

In the air conditioner of the present invention, the first and second outdoor heat exchangers connected in series are provided, and the second throttle connected between the first and second outdoor heat exchangers. By controlling the opening / closing means, the first throttle / opening / closing means, and the air volume control means, when the outdoor heat exchanger on the inlet side is frozen, the other side is controlled while defrosting the outdoor heat exchanger on the inlet side. Heating operation can be continued by the outdoor heat exchanger of.

Further, in the air conditioner of the present invention, the first and second outdoor heat exchangers connected in series are provided, and the second outdoor heat exchanger is connected between the first and second outdoor heat exchangers. Aperture / opening / closing means, first aperture / opening / closing means, first and second
When the outdoor heat exchanger on the inlet side is frozen by controlling the blower fan, the heating operation is continued by the other outdoor heat exchanger while controlling the defrosting on the outdoor heat exchanger on the inlet side. You can

Further, in the air conditioner of the present invention, the first and second outdoor heat exchangers connected in series are provided, and the second outdoor heat exchanger is connected between the first and second outdoor heat exchangers. When the outdoor heat exchanger on the inlet side is frozen by controlling the throttling / opening / closing means, the first throttling / opening / closing means, the air blowing means, and the louver means for variably controlling the air blowing to the outdoor heat exchanger on the inlet side. While the defrosting control is performed on the outdoor heat exchanger on the inlet side, the heating operation can be continued by the other outdoor heat exchanger.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing the structure of a refrigeration cycle of an air conditioner according to an embodiment of the present invention. The air conditioner shown in FIG. 1 uses a non-azeotropic mixed refrigerant as a refrigerant, but is composed of an indoor unit 10 and an outdoor unit 100, and the indoor unit 10 is composed of main components such as an indoor heat exchanger 11 and the like. The outdoor unit 100 includes the compressor 2, the four-way valve 3, the first throttle / opening / closing means 40, the first outdoor heat exchanger 51, the second outdoor heat exchanger 52, and the first and second outdoor heat. Exchanger 5
A second aperture / opening / closing means 41 connected between 1, 52,
First and second fans 71, 72 provided corresponding to the first and second outdoor heat exchangers 51, 52, first
A first temperature sensor 61 provided on the inlet side of the outdoor heat exchanger 51, and a second temperature sensor 62 provided at a point somewhere from the middle part to the outlet part of the second outdoor heat exchanger 52. It is composed of main parts.

In the air conditioner of this embodiment constructed as described above, the outdoor heat exchanger 5 is divided into two parts in the conventional air conditioner shown in FIG. 5 described above, and the first and second outdoor heat exchangers are exchanged. The heat exchangers 51 and 52 are provided, and the outdoor heat exchangers 51 and 5 are provided.
A second aperture / opening / closing means 41 is provided between the two
A major difference is that the outdoor heat exchangers 51 and 52 are provided with first and second fans 71 and 72, respectively.

The first and second aperture / opening / closing means 4
Reference numerals 0 and 41 both have a throttle mechanism and an opening / closing function, and are composed of, for example, a thermal expansion valve and a two-way valve, a capillary and a two-way valve, an electric expansion valve, and the like.

FIG. 2 shows the first and second temperature sensors 6
It is a figure showing a frost formation state judgment by 1, 62, and the horizontal axis shows the position from the inlet side of the first outdoor heat exchanger 51 to the outlet side of the second outdoor heat exchanger 52, and each of these The temperature at the position is shown on the vertical axis. Further, the horizontal axis indicates the position of the first temperature sensor 61 located on the inlet side of the first outdoor heat exchanger 51 and the position of the second temperature sensor 62 located on the outlet side of the second outdoor heat exchanger 52. The positions are shown, and the temperatures detected by the temperature sensors 61 and 62 at these positions are shown.

Thus, the first and second temperature sensors 6
1, 62 detect the temperatures of the inlet of the first outdoor heat exchanger 51 and the outlet of the second outdoor heat exchanger 52, respectively, so that the first and second outdoor heat exchangers 51, 5
It is used to determine the frost formation state of No. 2.

As can be seen from FIG. 2, the temperature at the inlet of the first outdoor heat exchanger 51 detected by the first temperature sensor 61 is the second outdoor temperature detected by the second temperature sensor 62. It is lower than the temperature at the outlet of the heat exchanger 52, as described in the related art. In FIG.
The line indicated by (1) is the first and second outdoor heat exchangers 51,
52 shows the characteristic at the time of normal operation without freezing, (2)
The line indicated by indicates the characteristic when the first outdoor heat exchanger 51 is frozen and the second outdoor heat exchanger 52 is not frozen, and the line indicated by (3) is the first and second The characteristics when both the outdoor heat exchangers 51 and 52 are frozen are shown.

Next, the operation will be described.

First, during the normal heating operation shown by the characteristic (1) in FIG. 2, the first throttle / opening / closing means 40 is the throttle of the refrigerating cycle, the second throttle / opening / closing means 41 is the full open, and the first and the second. The fans 71 and 72 are set to ON and used.
In the state set as described above, the high-temperature and high-pressure refrigerant gas compressed by the compressor 2 is guided to the indoor unit 10 after passing through the four-way valve 3, and is not illustrated while flowing through the indoor heat exchanger 11. By exchanging heat with the indoor air by the indoor blower, heat is released into the room and condensed. Then, the liquefied refrigerant returns to the outdoor unit 100, is decompressed by the first throttle / opening / closing means 40, and then flows through the first and second outdoor heat exchangers 51, 52 to provide the first and second fans. 71 and 72 exchange heat with the outdoor air to complete the evaporation process. The heated refrigerant gas enters the compressor 2 again, and is discharged as high-temperature and high-pressure refrigerant gas.

Next, the operation at the time of defrosting the inlet portion shown by the characteristic (2) in FIG. 2 will be described. In this case, since the first outdoor heat exchanger 51 is frosted, the defrosting operation is performed only on the first outdoor heat exchanger 51, and the second outdoor heat exchanger 52 is frosted. Since this is not done, the heating operation is controlled to continue.

That is, in this case, the diaphragm of the first diaphragm / opening / closing means 40 is loosened, the first fan 71 is stopped,
As a result, the first outdoor heat exchanger 51 and the indoor heat exchanger 11 are used as condensers for defrosting. Further, the second throttle / opening / closing means 41 is used as a throttle of the refrigeration cycle, whereby the second outdoor heat exchanger 52 is used as an evaporator, and the heating operation is continuously performed. By controlling in this manner, it is possible to defrost only the frozen portion while performing the heating operation.

Next, as shown by the characteristic (3) in FIG.
When both the second outdoor heat exchangers 51 and 52 are frozen and frost is attached to the entire surface, the first and second outdoor heat exchangers 51 and 52 are frozen.
Both throttles of the throttle / opening / closing means 40, 41 are loosened, whereby the normal defrosting control is performed on the entire first and second outdoor heat exchangers 51, 52.

FIG. 3 is a diagram showing the structure of a refrigeration cycle of an air conditioner according to another embodiment of the present invention. The air conditioner shown in the figure is the first one in the embodiment shown in FIG.
Also, the two fans of the second fans 71 and 72 are integrated into one large common fan 70, and the wind from the common fan 70 is controlled so as to hit or not hit the first outdoor heat exchanger 51. A louver 80 is provided between the common fan 70 and the second outdoor heat exchanger 52, and other configurations are the same as those in the embodiment of FIG.

In such a structure, during normal heating operation, the first throttle / open / close means 40 is the throttle of the refrigeration cycle, the second throttle / open / close means 41 is fully open, the common fan 70 is on, and the louver is on. In order to blow air also to the first outdoor heat exchanger 51, 80 is set to an open state as shown in FIG. 4A, and the heating operation is performed as in the case of FIG.

Further, at the time of defrosting the inlet portion shown by the characteristic (2) in FIG. 2, since the first outdoor heat exchanger 51 is frosted, only the first outdoor heat exchanger 51 is defrosted. Since the operation is performed and the second outdoor heat exchanger 52 is not frosted, in order to control to continue the heating operation, the first throttle /
The throttle of the opening / closing means 40 is loosened and the louver 80 is closed as shown in FIG. 4 (b) to prohibit air from being blown to the first outdoor heat exchanger 51, whereby the first outdoor heat exchanger 51 and the indoor Defrosting is performed using the heat exchanger 11 as a condenser. Also,
The second throttle / opening / closing means 41 is used as a throttle of the refrigeration cycle, whereby the second outdoor heat exchanger 52 is used as an evaporator, and the heating operation is continuously performed. By controlling in this manner, it is possible to defrost only the frozen portion while performing the heating operation.

Further, the first and second outdoor heat exchangers 5
When both 1 and 52 are frozen and frost is attached to the entire surface, both the first and second aperture / opening / closing means 40 and 41 are loosened, whereby the first and second outdoor Normal defrost control is performed on the entire heat exchangers 51, 52.

[0030]

As described above, according to the present invention,
First and second outdoor heat exchangers connected in series are provided, and a second throttle / opening / closing means and a first throttle / opening / closing means connected between the first and second outdoor heat exchangers. By controlling the air volume control means, when the outdoor heat exchanger on the inlet side is frozen, while controlling the defrosting on the outdoor heat exchanger on the inlet side, the heating operation is continued by the other outdoor heat exchanger. Therefore, comfort is not impaired, and since only the frozen portion is defrosted and the non-frozen portion is not defrosted, energy saving and economy can be achieved.

Further, in the air conditioner of the present invention, the first and second outdoor heat exchangers connected in series are provided, and the second outdoor heat exchanger connected between the first and second outdoor heat exchangers. Aperture / opening / closing means, first aperture / opening / closing means, first and second
When the outdoor heat exchanger on the inlet side is frozen by controlling the blower fan, the heating operation is continued by the other outdoor heat exchanger while controlling the defrosting on the outdoor heat exchanger on the inlet side. As a result, the comfort is not impaired, and since only the frozen portion is defrosted and the non-frozen portion is not defrosted, it is possible to save energy and achieve economy.

Further, in the air conditioner of the present invention, the first and second outdoor heat exchangers connected in series are provided, and the second outdoor heat exchanger connected between the first and second outdoor heat exchangers. When the outdoor heat exchanger on the inlet side is frozen by controlling the throttling / opening / closing means, the first throttling / opening / closing means, the air blowing means, and the louver means for variably controlling the air blowing to the outdoor heat exchanger on the inlet side. , The heating operation can be continued by the other outdoor heat exchanger while controlling the defrosting of the outdoor heat exchanger on the inlet side, so that comfort is not impaired and only the frozen part is defrosted. Since the non-frozen part is not defrosted, it is possible to achieve energy saving and economy.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a refrigeration cycle of an air conditioner according to an embodiment of the present invention.

FIG. 2 is the first used in the air conditioner shown in FIG.
It is a frosting state determination figure by the 2nd temperature sensor.

FIG. 3 is a diagram showing a configuration of a refrigeration cycle of an air conditioner according to another embodiment of the present invention.

4 is a diagram showing an operating state of a louver used in the air conditioner of FIG.

FIG. 5 is a diagram showing a configuration of a refrigeration cycle of a conventional air conditioner.

FIG. 6 is a diagram showing a change in capacity with respect to a change in time in a conventional air conditioner.

[Explanation of symbols]

 2 Compressor 3 Four-way valve 10 Indoor unit 11 Indoor heat exchanger 40, 41 First and second throttle / opening / closing means 51, 52 First and second outdoor heat exchanger 61, 62 First and second temperature Sensors 71, 72 First and second fans 100 Outdoor unit

Claims (3)

[Claims] 1. A non-azeotropic mixed refrigerant is used as a refrigerant, comprising an outdoor unit having a compressor, a four-way valve, a first throttle / opening / closing means and an outdoor heat exchanger, and an indoor unit having an indoor heat exchanger. In the above air conditioner, the outdoor heat exchanger has first and second outdoor heat exchangers connected in series,
A throttle mechanism and a second throttle / opening / closing means having an opening / closing function are connected between the first and second outdoor heat exchangers, and an air flow rate for each of the first and second outdoor heat exchangers is controlled. Of the first and second outdoor heat exchangers connected in series by controlling the first and second throttle / opening / closing means and the air volume control means. When the outdoor heat exchanger of 1 is frozen, the heating operation can be continued by the other outdoor heat exchanger while defrosting the outdoor heat exchanger on the inlet side. 2. A non-azeotropic mixed refrigerant is used as a refrigerant, comprising an outdoor unit having a compressor, a four-way valve, a first throttle / opening / closing means and an outdoor heat exchanger, and an indoor unit having an indoor heat exchanger. In the above air conditioner, the outdoor heat exchanger has first and second outdoor heat exchangers connected in series,
A throttle mechanism and a second throttle / opening / closing means having an opening / closing function are connected between the first and second outdoor heat exchangers, and an air flow rate for each of the first and second outdoor heat exchangers is controlled. So that each of the first and second outdoor heat exchangers is provided with a corresponding first and second blower fan, the first and second throttle / opening / closing means and the By controlling the first and second blower fans, when the outdoor heat exchanger on the inlet side of the first and second outdoor heat exchangers connected in series is frozen, the outdoor heat on the inlet side is frozen. An air conditioner characterized in that the heating operation can be continued by the other outdoor heat exchanger while controlling the defrosting of the exchanger. 3. An outdoor unit having a compressor, a four-way valve, a first throttle / opening / closing means and an outdoor heat exchanger, and an indoor unit having an indoor heat exchanger, wherein a non-azeotropic mixed refrigerant is used as the refrigerant. In the above air conditioner, the outdoor heat exchanger has first and second outdoor heat exchangers connected in series,
A blower that connects a throttle mechanism and a second throttle / opener / closure means having an opening / closing function between the first and second outdoor heat exchangers, and controls the air blown to the first and second outdoor heat exchangers. Means and louver means for variably controlling blown air from the blower means to the outdoor heat exchanger on the inlet side of the first and second outdoor heat exchangers, and the first and second throttle / opening / closing means When the outdoor heat exchanger on the inlet side of the first and second outdoor heat exchangers connected in series is frozen by controlling the blower means and the louver means, the inlet side An air conditioner characterized by being able to continue heating operation by the other outdoor heat exchanger while controlling the outdoor heat exchanger for defrosting.