KR100643079B1 - Energy-saving air conditioner using heat pump - Google Patents

Abstract

The present invention relates to an air conditioner using a heat pump, comprising an evaporator, an expansion valve for an evaporator, a reheat condenser, and a vaporization humidifier, and after the indoor air is introduced through an indoor air inlet, it is cooled, heated, dehumidified, or humidified. A first heat exchange chamber discharged to the room; An expansion valve for a first heat exchanger, a first heat exchanger, a second heat exchanger and an expansion valve for a second heat exchanger connected in parallel with the first heat exchanger, and an indoor air inlet and an outdoor air inlet through an indoor air intake and an outdoor air intake. A second heat exchange chamber for condensing or evaporating the refrigerant and introducing the mixed air to the first heat exchange chamber or the compressor; And between the evaporator, the expansion valve for the evaporator, the reheat condenser, the first heat exchanger, the expansion valve for the first heat exchanger, the second heat exchanger, the expansion valve for the second heat exchanger, and the compressor, which are connected by a pipe and constitute a refrigerant circulation circuit. A switching means for switching a refrigerant flow, wherein the switching means includes any one of the first heat exchanger or the second heat exchanger when the high pressure tube pressure of the compressor-> compressor is lower than a predetermined pressure during cooling. 1 If the pressure of the high pressure pipe of the heat exchanger and the compressor is equal to or higher than the preset pressure, switch to the first heat exchanger and the second heat exchanger-> evaporator expansion valve-> evaporator-> compressor, and when heating, the refrigerant is converted to the compressor-> reheater condenser. -> If the low pressure tube temperature of the compressor is equal to or higher than the preset temperature, the expansion valve for the first heat exchanger or the expansion valve for the second heat exchanger or the low pressure tube temperature of the compressor is the preset temperature. If less than the expansion valve for the first heat exchanger and the expansion valve for the second heat exchanger-> The heat exchanger connected to the expansion valve through which the refrigerant flows in the first heat exchanger or the second heat exchanger-> compressor, the refrigerant during the dehumidification- > Reheat condenser-> Expansion valve for evaporator-> Evaporator-> Compressor, characterized in that, according to the present invention, by improving the condensation efficiency and evaporation efficiency of the heat pump used in the power-saving air conditioner, While maximizing the amount of heat released during heating, it automatically blocks excessive rise of the refrigerant discharge pressure of the compressor due to the condensation failure of the condenser in the cold season, and the pressure of the refrigerant flowing into the compressor due to the poor evaporation during the cold season is excessively lowered and the refrigerant It automatically cuts off the flow of wet coolant at low temperature, preventing damage caused by excessive power consumption and compressor overload. There.

Heat Pumps, Air Conditioners

Description

Power-saving air conditioner using heat pump {POWER-SAVING AIR CONDITIONER USING HEAT PUMP}

1 is a block diagram of a power-saving air conditioner using a heat pump according to the present invention.

2 is a refrigerant flow chart during the cooling operation of the power-saving air conditioner using a heat pump according to the present invention.

3 is a flow chart of a refrigerant during heating operation of a power saving air conditioner using a heat pump according to the present invention.

4 is a flow chart of a refrigerant during dehumidification operation of a power saving air conditioner using a heat pump according to the present invention.

           Explanation of symbols on the main parts of the drawings

3: indoor side air outlet 5: first heat exchange room

7a, 7b: Indoor side air intake 9, 11, 15, 17: Damper

12: bulkhead 13a, 13b: outdoor side air intake

19: outdoor air outlet 21: second heat exchange room

23: antibacterial air filter 25: water hose

27: pre-carbon filter 29: ultraviolet lamp

31: nozzle 33: vaporized humidification element

35, 37, 39: filter drier 41: low pressure filter

43: high and low pressure switch 45, 47: high pressure switch

49: low pressure gauge 51: high pressure gauge

53: temperature sensor CO: compressor

HE1, HE2: Heat exchanger EV, EV1, EV2: Expansion valve

E: Evaporator RC: Reheat condenser

LR: Receiver AC: Liquid Separator

S1: Four-way valve S2, S3: Three-way valve

S4 ~ S7: Solenoid valve C1 ~ C9: Check valve

The present invention relates to an air conditioner using a heat pump, and more particularly, the inside of one housing is separated into two heat exchange chambers by a diaphragm and each heat exchange chamber is used as an indoor unit and an outdoor unit, while cooling regardless of the temperature of the outside air. The present invention relates to a power-saving air conditioner using a heat pump that exhibits an efficient refrigeration effect and maximizes the amount of heat emitted during heating.

The heat pump is a steam compression refrigeration cycle (usually a "refrigeration cycle" or "refrigeration cycle" or "composed by a pipe connected to a compressor, a first heat exchanger (condenser or evaporator), an expansion valve and a second heat exchanger (evaporator or condenser) in sequence). Is a cooling and heating system capable of performing both cooling and heating by switching the circulation direction of the refrigerant in the refrigerant circulation circuit. The switching means for switching the circulation direction of the refrigerant in the heat pump is usually used four-way, and each heat exchanger also acts as a condenser to release the latent heat of condensation depending on the refrigerant circulation direction, and also act as an evaporator to absorb the latent heat of evaporation.

The pipe connecting the compressor, the condenser, and the expansion valve in which the refrigerant maintains a high temperature and high pressure gas refrigerant or liquid refrigerant state is called a high pressure pipe or a high pressure side, and the refrigerant maintains a low temperature or low pressure liquid refrigerant or gas refrigerant state. The pipe connecting the expansion valve, the evaporator and the compressor is called a low pressure pipe or a low pressure side.

During the cooling operation by heat pump, the refrigerant should release the latent heat of condensation from the condenser to condense the refrigerant well. When the condensation is well done, the supercooling of the high-pressure refrigerant increases, so that the temperature and pressure drop from the expansion valve without generating fresh gas. When the temperature and pressure of the expansion valve are properly dropped, the absorption of latent heat of evaporation in the evaporator increases, which can increase the freezing effect. In addition, the condenser must be well condensed to lower the condensing pressure and the discharge pressure of the compressor, thereby reducing the compression work and consequently the power consumption. That is, the latent heat of evaporation absorbed in the evaporator of the heat pump is highly dependent on the condensation of the refrigerant in the condenser, and the smooth condensation in the condenser is possible only when the heat dissipation is smoothly performed in the condenser.

However, the cooling operation by the heat pump is mainly performed in summer. Therefore, in summer, condensation occurs in the outdoor unit and the refrigerant is circulated to evaporate in the indoor unit. In summer, the ambient temperature of the outdoor condenser is high, and heat dissipation does not occur sufficiently. As a result, condensation defects and latent heat of evaporation are reduced. This means that even if the cooling operation by the heat pump can not sufficiently obtain the cooling effect. In addition, in the cold season, the discharge pressure of the compressor may be increased too high due to the condensation failure of the condenser, which may cause excessive power consumption and may also cause damage due to the overload of the compressor. Therefore, when the discharge pressure of the compressor reaches the limit in the cold season, a device that can automatically drop the discharge pressure of the compressor is required.

Conventionally, various methods have been attempted to smoothly radiate the condenser in an air conditioner. For example, an air-cooling type that improves condensation efficiency by passing some of the indoor air cooled in outdoor air and passing the mixed air having a lowered temperature as a whole is passed through the condenser. The method, the method of using an air-cooled condenser and a water-cooled condenser, and selectively using them etc. are mentioned. Particularly, in Korean Patent Application Publication No. 10-354132, the present invention not only cools a condenser by using mixed air mixed with outdoor air and cooled indoor air during cooling, but also installs a cooling water sprayer on the front side of the condenser. A method of cooling a condenser by condensate of an evaporator is disclosed after installing a condensate pump capable of forcibly circulating the condensate falling into the evaporator drain plate at one side of the evaporator drain plate to force it to the cooling water sprayer. have. However, the condenser cooling method using the mixed air cooled by reducing the temperature as a whole by mixing some of the indoor air cooled in the outdoor air can increase the amount of heat emitted from the condenser to some extent, but by sacrificing part of the cold air, the indoor cooling is sacrificed as much. Therefore, there is a limit that can not increase the mixing amount of the cooled indoor air, in particular, there is a problem that the heat can not bring enough refrigerant condensation even if the indoor air is partially mixed with the outdoor air. In order to solve this problem, the present invention proposes a method of increasing condensation efficiency by supplying condensate collected in an evaporator drain plate with a pump and spraying the condenser with a nebulizer, but for this purpose, a pump, a cooling water sprayer, and a pipe are separately provided. Since the air conditioner has to be further complicated, the cost of manufacturing increases. In addition, in a condenser having a constant refrigerant capacity, by simply injecting condensate into the condenser without changing the capacity of the condenser, it is possible to prevent the compressor from being burned by rapidly decreasing the discharge pressure of the compressor when the discharge pressure of the compressor reaches the limit value. It is not there.

When heating by a heat pump, the refrigerant absorbs the latent heat of evaporation sufficiently to evaporate well, and when the evaporation is well done, the low pressure refrigerant has a high degree of saturation or superheat, which makes compression well in the compressor. It must be well done to reduce the compression load and consume less power, reduce the specific volume of the suction refrigerant in the condenser, and consequently increase the amount of heat generated for condensation. That is, the amount of heat released from the condenser of the heat pump is highly dependent on the evaporation of the refrigerant in the evaporator or the low pressure tube, and the smooth evaporation in the evaporator or the low pressure tube is sufficient to supply the latent heat of evaporation necessary for the refrigerant to evaporate around the evaporator or the low pressure tube. It should be possible.

However, the heating operation by the heat pump is mainly necessary in winter, and in winter, the refrigerant is circulated to condense in the indoor unit and evaporate in the outdoor unit, so that the heat source of latent heat of evaporation is insufficient around the evaporator or low pressure pipe of the outdoor unit. This results in poor evaporation and reduced heat of condensation. This means that even if the heating operation by the heat pump can not obtain the heating effect.

In the heating operation by the heat pump, there may be two methods for sufficiently supplying the latent heat of evaporation around the evaporator or the low pressure pipe. One of the methods is to supply a constant amount of heat around the evaporator or low pressure tube so that the temperature around the evaporator or low pressure tube does not become too low. As a method of supplying latent heat of evaporation around an evaporator or a low pressure pipe, Korean Patent Publication No. 10-496376 discloses a method of providing a heat exchange between a high pressure pipe and a low pressure pipe by providing an auxiliary heat exchange unit. However, according to the invention No. 10-496376, there is a drawback that the heating effect is hardly expected in the cold season because the amount of heat emitted from the condenser is excessively reduced during the heating operation by the heat pump. In addition, even in accordance with the invention No. 10-496376, in the cold weather, if the outside air temperature drops too much, the refrigerant does not sufficiently absorb the latent heat of evaporation, the evaporator is frozen, the refrigerant also does not evaporate and enters the compressor in the wet refrigerant state Therefore, there is a problem that causes an overload of the compressor and thereby causes a burnout of the compressor.

The present invention has been made to solve the problems of the air conditioner using the conventional heat pump described above is to improve the condensation efficiency and evaporation efficiency of the air-saving type air conditioner using a heat pump that can maximize the cooling effect when cooling and the amount of heat emitted during heating The purpose is to provide.

It is another object of the present invention to automatically block the excessive rise of the refrigerant discharge pressure of the compressor due to the condensation failure of the condenser in the cold season, and the pressure of the refrigerant flowing into the compressor due to the poor evaporation in the cold season is excessively lowered and the refrigerant is The present invention provides a power saving air conditioner using a heat pump that automatically cuts off a wet refrigerant state and prevents burnout due to excessive power consumption and compressor overload.

Energy-saving air conditioner using a heat pump according to the present invention to achieve the above object

A first heat exchange chamber having an evaporator, an expansion valve for an evaporator, a reheat condenser, and a vaporized humidifier, and introducing indoor air through an indoor air inlet and then cooling, heating, dehumidifying, or humidifying and discharging the indoor air;

An expansion valve for a first heat exchanger, a first heat exchanger, a second heat exchanger and an expansion valve for a second heat exchanger connected in parallel with the first heat exchanger, and an indoor air inlet and an outdoor air inlet through an indoor air intake and an outdoor air intake. A second heat exchange chamber for condensing or evaporating the refrigerant and introducing the mixed air to the first heat exchange chamber or the compressor; And

Refrigerant between the evaporator, the expansion valve for evaporator, the reheat condenser, the expansion valve for the first heat exchanger, the expansion valve for the first heat exchanger, the expansion valve for the second heat exchanger, and the second heat exchanger, which are connected by a pipe and constitute a refrigerant circulation circuit. Switching means for switching the flow; including, but the switching means

 At the time of cooling, the refrigerant is converted into either one of the first heat exchanger or the second heat exchanger if the pressure of the high pressure tube of the compressor-> compressor is lower than the preset pressure, or the first heat exchanger if the pressure of the high pressure tube of the compressor is equal to or higher than the preset pressure. Switch to the second heat exchanger-> evaporator expansion valve-> evaporator-> compressor,

In case of heating, if the low pressure tube temperature of the compressor-> reheat condenser-> compressor is higher than the preset temperature, the expansion valve for the first heat exchanger or the expansion valve for the second heat exchanger or the low pressure tube temperature of the compressor is preset If the temperature is lower than the expansion valve for the first heat exchanger and expansion valve for the second heat exchanger-> the first heat exchanger or the heat exchanger connected to the expansion valve through which the refrigerant flows in the second heat exchanger-> switch to the compressor,

During dehumidification, the refrigerant is converted into a compressor-> reheat condenser-> evaporator expansion valve-> evaporator-> compressor.

Hereinafter, with reference to the accompanying drawings will be described a preferred embodiment of a power saving air conditioner using a heat pump according to the present invention.

1 is a block diagram of a power saving air conditioner using a heat pump according to the present invention, Figure 2 is a flow chart of the refrigerant during the cooling operation of the power saving air conditioner using a heat pump according to the present invention, Figure 3 4 is a flowchart illustrating a refrigerant during heating operation of a power saving air conditioner using a heat pump, and FIG. 4 is a flowchart illustrating a refrigerant during dehumidifying operation of a power saving air conditioner using a heat pump according to the present invention.

Referring to FIG. 1, the air conditioner according to the present invention separates a single housing by a partition wall 12 and performs a function of an indoor unit, and a second heat exchange chamber performing a function of an outdoor unit ( 21).

The first heat exchange chamber 5 includes an indoor side air inlet 7a for introducing indoor air, an outdoor side air inlet 13a for introducing outdoor air, a malodorous component in the introduced air, suspended matter or bacteria, and the like. Antibacterial air filter 23 capable of removing the air, an indoor air outlet 3 capable of discharging the heat-exchanged air into the room, and an air flow formed between the air inlets 7a and 13a and the air outlet 3 A first blower F1 is provided. The indoor air suction opening 7a and the outdoor air suction opening 13a are provided with dampers 9 and 15 for adjusting the amount of intake air. In addition, the first heat exchange chamber (5) has a water hose (25) connected to direct water or a pump, a pre-carbon filter (27) for purifying water passing through the water hose (25), for humidification operation; An ultraviolet lamp tube 29 for sterilizing water passing through the water hose 25, a nozzle 31 provided at the tip of the water hose 25 to spray water, and disposed below the nozzle 31. And vaporization type humidification element 33 for natural water vaporization by the air passing while holding the water injected from the nozzle 31, and an evaporation type consisting of an electromagnetic valve S7 for opening and closing the water hose 25 It is preferable to further provide a humidifier.

The second heat exchange chamber 21 has an indoor side air suction port 7b for introducing indoor air, an outdoor side air suction port 13b for introducing outdoor air, and a room for discharging heat-exchanged air into the room. A second air blower (F2) is formed to form a flow of air between the side air outlet (19) and the air inlet (7b, 13b) and the air outlet (19). Dampers 11 and 17 for adjusting the amount of intake air are also provided at the indoor side air suction opening 7b and the outdoor side air suction opening 13a of the second heat exchange chamber 21.

FIG. 1 exemplarily illustrates a case in which the indoor side air suction opening 7a of the first heat exchange chamber 5 and the indoor side air suction opening 7b of the second heat exchange chamber 21 are adjacent to each other with the diaphragm 12 interposed therebetween. Although shown, these indoor side air intakes 7a and 7b are not necessarily arranged adjacently because they are connected to the room by ducts. In addition, FIG. 1 illustrates an example in which the outdoor air inlet 13a of the first heat exchange chamber 5 and the outdoor air intake 13b of the second heat exchange chamber 21 are adjacent to each other with the diaphragm 12 interposed therebetween. Although shown as, these outdoor side air intakes (13a, 13b) are connected to the outdoors by the duct does not necessarily have to be adjacent to each other. However, the indoor air suction opening 7a and the outdoor air suction opening 13a of the first heat exchange chamber 5 should be arranged to allow the air introduced into the first heat exchange chamber 5 to be mixed with each other in the indoor and outdoor spaces. In addition, the indoor air suction opening 7a and the outdoor air suction opening 13a of the second heat exchange chamber 21 should also be arranged to allow the air introduced into the second heat exchange chamber 21 to be mixed with each other.

The indoor air outlet 3 and the outdoor air outlet 21 are also connected to the indoor and outdoor by ducts, respectively.

One of the features of the present invention is provided with an evaporator (E) and a reheat condenser (RC) in the first heat exchange chamber (5), two heat exchangers (HE1, HE2) are provided in the second heat exchange chamber (21). Thus, during the cooling, heating, and dehumidification operation, an appropriate refrigerant circulation circuit is formed therebetween, and the air flowing in from the indoor air intakes 7a and 7b and the outdoor air intakes 13a and 13b is appropriately mixed. By maximizing the condensation efficiency and evaporation efficiency, it is possible to protect components such as compressors in the cold or cold weather.

Accordingly, the first heat exchange chamber 5 includes not only the vaporized humidifier 33 but also an evaporator E, an evaporator expansion valve EV, and a reheat condenser RC. 21) a first heat exchanger HE1, an expansion valve EV1 for the first heat exchanger, a second heat exchanger HE2 and an expansion valve EV2 for the second heat exchanger connected in parallel with the first heat exchanger HE1. It is provided.

As shown in FIG. 1, the evaporator E, the expansion valve EV for the evaporator, the reheat condenser RC, the first heat exchanger HE1, the expansion valve EV1 for the first heat exchanger, and the second heat exchanger (HE2) and the second heat exchanger expansion valve (EV2) is connected to the compressor (CO) and the valves (S1 to S6, C1 to C9), which are means for switching the refrigerant circulation path, to form a refrigerant circulation circuit. In the refrigerant circulation circuit, rotten liquid refrigerant is separated from the receiver LR for temporarily receiving the condensed refrigerant and supplying the expansion valves EV, EV1, and EV2 to the low pressure gas refrigerant recovered to the compressor CO. It is preferable to further provide a liquid separator AC.

Opening / closing control of the refrigerant circulation path switching valves S1 to S6 and water hose opening / closing valve S7, on / off control of the compressor CO and the blowers F1 and F2, and the dampers 9, 11, Control of the opening and closing of the air conditioners 15 and 17 or the wind speed control of the blowers F1 and F2 is performed by a conventional air conditioner controller (not shown in the drawing for convenience).

Another feature of the present invention is to circulate the refrigerant so that condensation occurs only in any one heat exchanger of the first heat exchanger (HE1) or the second heat exchanger (HE2) when the pressure of the high pressure pipe of the compressor (CO) is lower than a predetermined pressure during cooling. When the pressure of the high pressure tube of the compressor is equal to or higher than the preset pressure, the refrigerant is circulated so that condensation occurs in both the first heat exchanger HE1 and the second heat exchanger HE2. By doing so, not only can the condensation efficiency be maximized, but also the overload of the compressor due to the poor condensation in the cold condenser can be prevented.

To this end, the high pressure pipe of the compressor CO is provided with a first high pressure switch 45. The first high pressure switch 45 outputs a corresponding power signal to the controller when the pressure of the high pressure pipe of the compressor CO rises above the set value due to the condensation failure in the condenser HE1 or HE2, and the controller is a valve. The first heat exchanger HE1 and the second heat exchanger HE2 are simultaneously connected to the high pressure side of the compressor C by the opening and closing control of S3, so that the first heat exchanger HE1 and the second heat exchanger are Refrigerant is introduced into both (HE2). As a result, the heat dissipation area is increased momentarily, condensation becomes active, and the high pressure tube pressure of the compressor CO is also lowered in a short time. The set pressure of the first high pressure switch 45 is different depending on the RT (Refrigeration Tone) of the compressor used, but it is generally preferred to be around 17Kg / cm 2.

The high pressure pipe of the compressor CO is further provided with a second high pressure switch 47, and the second high pressure switch 47 has the second blower when the pressure of the high pressure pipe of the compressor C is higher than or equal to a set pressure. Outputs a voltage signal necessary for accelerating the rotational speed (wind speed) of F2) to the controller, and the controller accelerates the second blower F2 according to the voltage signal of the second high pressure switch 47 to condenser It is preferable to increase the amount of heat emitted from (HE1, HE2). At this time, the set pressure of the second high pressure switch 47 also varies depending on the RT (Refrigeration Tone) of the compressor used, but it is generally preferred to be around 25Kg / cm 2.

In addition, the high pressure pipe and the low pressure pipe of the compressor (CO) is provided with a high low pressure switch 43 for outputting the pressure of the high pressure pipe and the low pressure pipe to the controller, the controller is a high pressure pipe of the compressor (CO) It is preferable to turn off the power of the compressor CO when the pressure rises above the set value or when the low pressure pipe pressure of the compressor CO falls below the set value. At this time, the setting pressure of the high and low pressure switch 43 also varies depending on the RT (Refrigeration Tone) of the compressor used, but the high pressure setting value is about 30Kg / cm 2, and the low pressure setting value is preferably 3Kg / cm 2.

Preferably, the high pressure pipe and the low pressure pipe of the compressor CO are provided with a high pressure gauge 51 and a low pressure gauge 49 capable of visually confirming the pressure of the high pressure pipe and the low pressure pipe.

According to another aspect of the present invention, when the low pressure tube temperature of the compressor CO during heating is greater than or equal to a preset temperature, the refrigerant may be evaporated only in any one heat exchanger of the first heat exchanger HE1 or the second heat exchanger HE2. The refrigerant is circulated so that evaporation occurs in both the first heat exchanger HE1 and the second heat exchanger HE2 when the low pressure tube temperature of the compressor CO is lower than or equal to a preset temperature.

To this end, the low pressure tube of the compressor CO is provided with a temperature sensor 53. The temperature sensor 53 outputs a corresponding power signal to the controller when the pressure of the compressor CO low pressure pipe falls below a set value due to poor evaporation in the evaporator HE1 or HE2, and the controller is used for the first heat exchanger. The solenoid valve S5 provided at the front end of the expansion valve EV1 and the solenoid valve S4 provided at the front end of the expansion valve EV2 for the second heat exchanger are opened to open the first heat exchanger HE1 and the second heat exchanger ( At the same time, the evaporation takes place simultaneously in both HE2). As a result, the evaporation area is broadened momentarily, so that the evaporation becomes active and the low pressure tube temperature of the compressor (CO) rises to the normal evaporation temperature in a short time. The set temperature of the temperature sensor 53 is different depending on the RT (Refrigeration Tone) of the compressor used, but is usually about -5 ℃.

Another feature of the present invention is to change the refrigerant during the dehumidification in the compressor (CO)-> reheat condenser (RC)-> evaporator expansion valve (EV)-> evaporator (E)-> compressor (CO), Dehumidification is performed without deterioration. That is, during the dehumidification, condensation takes place in the reheat condenser RC provided in the first heat exchange chamber 5, and a refrigerant circulation circuit is performed so that evaporation occurs in the evaporator E provided in the first heat exchange chamber 5. By constitution, the dehumidification is possible without deterioration of the room temperature because the reheated condenser RC is reheated and discharged before the cooled air is discharged to the room while the water vapor is desorbed from the evaporator E.

Another feature of the present invention is that the two heat exchangers HE1 and HE2 provided in the second heat exchange chamber 21 alternately use the condenser during cooling and the evaporator during heating, whereas the first heat exchange chamber 5 In the reheat condenser (RC), which is one of the two heat exchangers (RC, E) provided in the condenser, the condenser is used for heating and dehumidification at all times, and the other evaporator (E) always evaporates. It is configured to be used only for cooling. Such a configuration is particularly advantageous in performing a constant temperature function in a room in which equipment sensitive to temperature change is installed by an air conditioner. That is, in constant temperature operation, if the indoor air is excessively cooled by overcooling during cooling, it is necessary to immediately raise the room temperature by temporary heating operation. At this time, when the evaporator used for cooling is immediately converted into a condenser, the thermal efficiency is reduced. It will fall greatly. If the room air is overheated even during heating, it is necessary to lower the room temperature by the temporary cooling operation. At this time, if the condenser used for heating is immediately converted to the evaporator, the cooling effect is greatly reduced. Therefore, it is preferable that the heat exchanger for condensation or evaporation is provided in the 1st heat exchange chamber 5 used for an indoor unit.

The refrigerant switching means may be configured by a combination of various valves, but in the embodiment illustrated in FIGS. 1 to 4, one four-way valve S1 (in this specification, a four-way solenoid valve is simply referred to as a “four-way valve”). ), Two three-way valves (S2, S3) (three-way solenoid valve is simply referred to herein as "three-way valve"), three solenoid valves (S4 to S6) (in this specification, the two-way solenoid valve is simply referred to as "solenoid valve) ") And nine check valves (C1 to C9) are shown as an example.

Referring to FIG. 1, the high pressure pipe of the compressor CO may be formed through the four-way valve S1, the first three-way valve S2, the second three-way valve S3, and the check valves C2 and C3. It is connected to the first heat exchanger HE1 and the second heat exchanger HE2, and the first heat exchanger HE1 and the second heat exchanger HE2 are connected to the receiver LR via check valves C4 and C5. Is connected to the expansion valve EV for the evaporator via the solenoid valve S6 and the filter drier 35, the expansion valve is connected to the evaporator E, and the evaporator E) is connected to the liquid separator (AC) via a check valve (C9) and the four-way valve (S1), the liquid separator (AC) is a suction observation filter 41 for filtering foreign matter from the refrigerant gas It is connected to the compressor CO via.

In addition, the high pressure pipe of the compressor (CO) is connected to the reheat condenser (RC) via the four-way valve (S1) and the check valve (C8), the reheat condenser (RC) via the check valve (C6). Connected to the receiver LR, the receiver LR is connected to the check valve (C5) or check valve (C4) in parallel with the solenoid valve S5, filter drier 39 and the first heat exchanger expansion valve (EV1) Or the first heat exchanger HE1 and the second heat exchanger HE2 via the solenoid valve S4, the filter drier 37, and the expansion valve EV2 for the second heat exchanger. HE1 and the second heat exchanger HE2 are connected to the four-way valve S1 via a check valve C1, and the four-way valve S1 connects the liquid separator AC and the suction observation filter 41. Via a compressor.

In addition, the high pressure pipe of the compressor (CO) is connected to the reheat condenser (RC) via the four-way valve (S1), the first three-way valve and the check valve (C7), the reheat condenser (RC) is a check valve It is connected to the receiver LR via C6, and the receiver is connected to the expansion valve EV for the evaporator via the solenoid valve S6 and the filter drier 35, and the expansion valve EV for the evaporator. ) Is connected to the evaporator (E), the evaporator (E) is connected to the compressor (CO) via the check valve (C9), the four-way valve (S1), the liquid separator (AC) and the suction observation filter (41). Connected.

Hereinafter, a cooling operation, a heating operation, a humidification operation, and a dehumidification operation method of a power saving air conditioner using a heat pump according to the present invention having the above-described configuration will be described in detail with reference to FIGS. 2 to 4. In FIG. 2 to FIG. 4, the pipe and the heat exchanger through which the refrigerant does not flow are indicated by dotted lines, and the pipe and the heat exchanger through which the refrigerant flows are indicated by solid lines.

Referring to FIG. 2, for cooling operation, the controller connects a b port connected to a high pressure tube of the compressor CO among the ports of the four-way valve S1 to a port of the first three-way valve S2, The d port connected to the liquid separator AC is connected to the c port connected to the evaporator E among the ports of the four-way valve S1. In addition, the controller closes the b port of the first three-way valve (S2) and connects the a port connected to the four-way valve (S1) to the c port connected to the second three-way valve (S3).

The opening and closing control of the second three-way valve S3 by the controller varies according to the high pressure stage pressure of the compressor CO sensed by the first pressure switch 45. That is, when the high pressure stage pressure of the compressor CO is less than the preset pressure, the b port connected to the second heat exchanger HE2 among the ports of the second three-way valve S3 is closed and connected to the first three-way valve S2. The c port is connected to the a port connected to the first heat exchanger HE1, or the a port is closed, and the c port is connected to the b port. In addition, when the high pressure stage pressure of the compressor CO is higher than or equal to a preset pressure, the c port is connected to both the a port and the b port.

In addition, the controller closes the solenoid valve S5 provided on the flow path of the expansion valve EV1 for the first heat exchanger and the solenoid valve S4 provided on the flow path of the expansion valve EV2 for the second heat exchanger, and receives the receiver LR. And the solenoid valve S6 provided between the evaporator (E) side filter drier 35 is opened.

When cooling by the opening and closing of the above-described valves S1 to S6, the refrigerant is the first heat exchanger HE1 or the second heat exchanger when the pressure of the high pressure tube of the compressor CO-> compressor CO is less than the preset pressure. If the pressure of the high-pressure tube of any one heat exchanger or compressor of HE2) is equal to or higher than the preset pressure, the first heat exchanger HE1 and the second heat exchanger HE2-> expansion valve for the evaporator (EV)-> evaporator (E)- Condensation takes place in the first heat exchanger HE1 or the second heat exchanger HE2 while circulating the compressor CO, and evaporation occurs in the evaporator E. At this time, the indoor air intake dampers 9 and 11 of the first heat exchange chamber 5 and the second heat exchange chamber 21 are opened, and the outdoor air intake damper 15 of the first heat exchange chamber 5 is opened. The outdoor air intake damper 17 of the second heat exchange chamber 21 is opened. By doing so, the indoor air is cooled while being circulated in the first heat exchange chamber 5, and the first heat exchanger HE1 or the second heat exchanger is cooled in the second heat exchange chamber 21 while the cooled indoor air is mixed with the outdoor air. The refrigerant is condensed while passing through HE2. Even during cooling, it is preferable to periodically open the outdoor air intake damper 15 of the first heat exchange chamber 21 so that outdoor air is periodically introduced into the room.

Referring to FIG. 3, for the heating operation, the controller connects the b port connected to the high pressure tube of the compressor CO among the ports of the four-way valve S1 to the c port connected to the reheat condenser RC. A port d of the four-way valve S1 connected to the liquid separator AC is connected to a port d connected to the first heat exchanger HE1 and the second heat exchanger HE2. In addition, the controller closes the first three-way valve (S2), the second three-way valve (S3) and the solenoid valve S6.

The opening and closing control of the solenoid valves S4 and S5 by the controller depends on the low pressure stage temperature of the compressor CO sensed by the temperature sensor 53. That is, when the low pressure stage temperature of the compressor CO is higher than or equal to the preset temperature, the solenoid valve of the solenoid valve S4 or S5 is opened to open the expansion valve EV1 for the first heat exchanger or the expansion valve EV2 for the second heat exchanger. If the expansion of the refrigerant occurs in one of the expansion valves and the low pressure stage temperature of the compressor CO is lower than the preset temperature, the solenoid valves S4 and S5 are simultaneously opened to expand the expansion valve EV1 for the first heat exchanger and the expansion for the second heat exchanger. The expansion of the refrigerant occurs in both the valves EV2.

When the refrigerant is heated by the opening and closing of the valves S1 to S6 described above, the expansion valve for the first heat exchanger when the refrigerant pressure of the compressor (CO)-> reheat condenser (RC)-> compressor (CO) is higher than or equal to a preset temperature. (1) expansion valve (EV1) or expansion valve (EV2) for the second heat exchanger, if the low pressure tube temperature of the compressor (CO) is less than a predetermined temperature, the expansion valve (EV1) for the first heat exchanger and the expansion valve for the second heat exchanger ( EV2)-> Condensation occurs in the reheat condenser (RC) while circulating the heat exchanger-> compressor (CO) connected to the expansion valve through which the refrigerant flows in the first heat exchanger (HE1) or the second heat exchanger (HE2). Evaporation takes place in the heat exchanger HE1 or the second heat exchanger HE2. At this time, the indoor air intake dampers 9 and 11 of the first heat exchange chamber 5 and the second heat exchange chamber 21 are opened, and the outdoor air intake damper 15 of the first heat exchange chamber 5 is opened. The outdoor air intake damper 17 of the second heat exchange chamber 21 is opened. By doing so, the indoor air is circulated and heated in the first heat exchange chamber 5, and the first heat exchanger HE1 or the second heat exchanger is heated in the second heat exchange chamber 21 while the heated indoor air is mixed with the outdoor air. Passing through HE2 provides the latent heat of evaporation to the refrigerant. When heating, it is preferable to periodically open the outdoor air intake damper 15 of the first heat exchange chamber 21 so that outdoor air is periodically introduced into the room.

Referring to FIG. 4, for the dehumidification operation, the controller connects b port and a port connected to the high pressure pipe of the compressor CO among the ports of the four-way valve S1, and a port of the four-way valve S1. Port a of the first three-way valve (S2) connected to the port b of the first three-way valve (S2) connected to the reheat condenser (RC). In addition, the c port of the first three-way valve (S2) is closed to block the refrigerant from entering the first heat exchanger (HE1) or the second heat exchanger (HE2). The solenoid valve S6 is opened, and the second three-way valve S3, the solenoid valve S4 and the solenoid valve S5 are closed.

When dehumidifying by opening / closing the valves S1 to S6 described above, the refrigerant is supplied to the compressor (CO)-> reheat condenser (RC)-> evaporator expansion valve (EV)-> evaporator (E)-> compressor (CO). While circulating, condensation takes place in the reheat condenser (RC), and evaporation and dehumidification take place in the evaporator (E). At this time, all the dampers 11, 15, and 17 except for the indoor side air intake damper 9 of the first heat exchange chamber 5 are closed. As a result, dehumidification is performed while indoor air is circulated in the first heat exchange chamber 5, and refrigerant circulation is blocked in the first heat exchanger HE1 or the second heat exchanger HE2.

According to the present invention having the above-described configuration, while improving the condensation efficiency and evaporation efficiency of the heat pump used in the power-saving air conditioner to maximize the cooling effect during cooling and the amount of heat emitted during heating, the refrigerant of the compressor due to the condensation failure of the condenser in the heat Excessive increase in discharge pressure is automatically cut off, and the pressure of the refrigerant flowing into the compressor due to poor evaporation in cold weather is excessively lowered, and the refrigerant is automatically blocked from flowing into the low temperature wet refrigerant state. There is an effect that can prevent damage caused by overload of the compressor.

Claims (1)

Evaporator (E), expansion valve (EV) for evaporator, reheat condenser (RC) and evaporative humidification element (33) are provided, and the indoor air is introduced through the indoor air intake (7a), and then cooled, heated, and dehumidified. Or a first heat exchange chamber 5 that humidifies and discharges the room; And a first heat exchanger (HE1), an expansion valve (EV1) for the first heat exchanger, a second heat exchanger (HE2) connected in parallel with the first heat exchanger (HE1), and an expansion valve (EV2) for the second heat exchanger. The mixed air of the indoor air and the outdoor air is introduced through the indoor air suction port 7b and the outdoor air suction port 13b, and the refrigerant is condensed or evaporated and sent to the first heat exchange chamber 5 or the compressor CO. A second heat exchange chamber 21; The evaporator (E), the evaporator expansion valve (EV), the reheat condenser (RC), the first heat exchanger (HE1), the first heat exchanger expansion valve (EV1), which are connected by a pipe and constitute a refrigerant circulation circuit, And a switching means for switching a refrigerant flow between the second heat exchanger HE2, the expansion valve EV2 for the second heat exchanger, and the compressor CO. The switching means At the time of cooling, if the pressure of the high pressure tube of the compressor (CO)-> compressor (CO) is less than the preset pressure, the heat exchanger of any one of the first heat exchanger (HE1) or the second heat exchanger (HE2) and the high pressure tube of the compressor If the pressure is equal to or greater than the preset pressure, switch to the first heat exchanger HE1 and the second heat exchanger HE2-> expansion valve for the evaporator (EV)-> evaporator (E)-> compressor (CO), When heating, the refrigerant is supplied to the first heat exchanger expansion valve (EV1) or the second heat exchanger expansion valve (EV2) when the temperature of the low pressure pipe of the compressor (CO)-> reheat condenser (RC)-> compressor (CO) is equal to or higher than the preset temperature. ), The expansion valve EV1 for the first heat exchanger and the expansion valve EV2 for the second heat exchanger EV2 to the first heat exchanger HE1 when the low pressure tube temperature of the expansion valve or the compressor CO is lower than the preset temperature. The second heat exchanger (HE2) is switched to the heat exchanger-> compressor (CO) connected to the expansion valve flowing refrigerant, During dehumidification, the refrigerant is converted into a compressor (CO)-> reheat condenser (RC)-> evaporator expansion valve (EV)-> evaporator (E)-> compressor (CO). Conditioner.

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