KR20050001386A - Air conditioner - Google Patents

Abstract

PURPOSE: An air conditioner is provided to improve the capability according to increase in flow of injection gas, and improve the efficiency of recovering engine heat. CONSTITUTION: A refrigerant discharged from a compressor(11) driven according to an engine(61) is circulated through outdoor heat exchangers(15) and indoor heat exchangers(35). Cooling operation and heating operation are executed by heat exchange action of the refrigerant. Bypass lines(51,52) returning refrigerant gas to the compressor are directly and/or indirectly connected with a liquid line(45) moving a liquid refrigerant to the outdoor heat exchangers from the indoor heat exchangers in heating operation. The heat exchangers evaporate the liquid refrigerant sent to the bypass lines, and evaporated refrigerant gas is returned to the compressor.

Description

Air Conditioner {AIR CONDITIONER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner that circulates a refrigerant by driving a compressor for refrigerant compression to perform cooling and heating. In particular, it is possible to provide a liquid using a system arrangement (for example, the engine arrangement when driving a compressor by an engine). An air conditioner for vaporizing a refrigerant to obtain an injection gas to improve air conditioning capability.

In the air conditioner, for example, in the case of heating operation, the gas refrigerant from the compressor is circulated from the indoor heat exchanger to the outdoor heat exchanger. At this time, when the outside air temperature is low, it becomes difficult to obtain sufficient heating capacity. Therefore, the gas injection which isolate | separates the gas refrigerant mixed in the liquid refrigerant which flows into an outdoor heat exchanger, and returns the gas refrigerant separated by that to the compressor is performed. As a result, the gas refrigerant is compressed by the compressor and supplied to the indoor heat exchanger, thereby improving the overall heating capacity.

As for the air conditioner which performs such gas injection, it is described in Unexamined-Japanese-Patent No. 11-142001, for example. In this air conditioner, a gaseous separator is placed in a liquid pipe between an indoor heat exchanger and an outdoor heat exchanger, and a bypass valve composed of an on / off valve is provided in the bypass pipe between the gas liquid separator and the suction side of the compressor.

In the gas-liquid separator, the gas refrigerant and the liquid refrigerant are separated up and down, and when the bypass valve is opened, the suction force from the compressor acts in the gas-liquid separator, and the upper portion is passed through the bypass pipe opening near the upper wall of the gas-liquid separator. The gas refrigerant on the side is sucked out and returned to the compressor. Moreover, the air conditioner of the said publication aims at preventing the liquid refrigerant from mixing in the injection gas especially because the height of the liquid surface of the liquid refrigerant in a gas-liquid separator becomes high. This is because when the liquid refrigerant is sucked into the compressor, liquid compression occurs, and if this continues, the compressor is broken and reliability is lowered.

[Patent Document 1]

Japanese Patent Application Laid-Open No. 11-142001 (2nd to 4th pages, Fig. 1)

As mentioned above, in the conventional air conditioner, in order to improve the air-conditioning capability according to the high load demand, the gas injection which returns the gas refrigerant separated by the gas-liquid separator to the compressor is performed. At that time, it is necessary to prevent liquid mixing in order to maintain the reliability of the compressor, and a gaseous refrigerant is also used in the injection gas, and a general way of thinking about actively excluding the liquid refrigerant has been common.

However, only returning the gas refrigerant to the compressor has a limitation in the flow rate of the injection gas through which the bypass pipe flows, and cannot significantly demand an improvement in the air conditioner. On the other hand, there has been a problem that the air conditioner itself is enlarged, such as increasing the diameter of the pipe, if the flow rate is to be secured above.

Then, an object of this invention is to provide the air conditioner which improved the capability by increasing the flow volume of injection gas, in order to solve such a subject.

1 is a block diagram showing a refrigerant circulation line of an air conditioner of a first embodiment;

Fig. 2 is a block diagram showing a refrigerant circulation line of the air conditioner of the second embodiment.

3 is a block diagram showing a refrigerant circulation line of the air conditioner of the third embodiment;

4 is a circuit diagram of a gasification system of a liquid refrigerant using an engine arrangement.

Fig. 5 is a graph showing the relationship between the air conditioning demand load and the control capability width in the air conditioner of the embodiment;

<Explanation of symbols for the main parts of the drawings>

1: air conditioner

10, 30: outdoor unit

11: compressor

12, 27: Accumulator

15: outdoor heat exchanger

17: receiver tank

26: heat exchanger

35: indoor heat exchanger

41: common line

51, 52: bypass line

61: gas engine

The air conditioner of the present invention circulates a refrigerant discharged from a compressor driven in accordance with an engine through an outdoor heat exchanger and an indoor heat exchanger, and performs cooling operation and heating operation by a heat exchange action of the refrigerant. The returning bypass line is directly or indirectly connected to the liquid line through which liquid refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger during the heating operation, and the liquid refrigerant supplied to the bypass line is on the line. It is characterized by evaporating and evaporating by the installed heat exchanger and returning the vaporized refrigerant gas to the compressor.

And as an embodiment which connects a bypass line to a liquid line, it is preferable that it is the following structures.

For example, a receiver tank for separating a gas refrigerant and a liquid refrigerant is provided in the liquid line, and the bypass line is connected to the liquid layer portion of the receiver tank.

In addition, a receiver tank for separating a gas refrigerant and a liquid refrigerant is provided in the liquid line, and the bypass line is connected to the gas layer and the liquid line of the receiver tank, respectively, via an open / close valve.

According to the air conditioner of the present invention having such a configuration, since the liquid refrigerant flows through the bypass line and is vaporized by a heat exchanger to obtain the injection gas, the injection gas is compared with the conventional gas which has been returned as the injection gas as it is. The flow rate of can be obtained. Therefore, a large flow rate of injection gas can be returned to the compressor, whereby a large power can be obtained from the compressor, and the heating capability can be improved.

In addition, if a receiver tank is provided and connected indirectly, the gas injection (rejected gas) from which the gas refrigerant (injection gas) can be taken out can be used in combination with the compressor, so that it is possible to cope with the high load demand during cooling.

In addition, the air conditioner of the present invention is preferably such that the heat exchanger provided on the bypass line flows cooling water obtained by obtaining heat from the engine so as to flow the cooling water to evaporate the liquid refrigerant to obtain the injection gas.

Therefore, according to the air conditioner of the present invention, when the heating and air conditioning capability is improved by the backflow of the injection gas vaporizing the liquid refrigerant, the engine array is used in the process of obtaining the injection gas from the liquid refrigerant, so that the engine array is recovered. The efficiency is good.

Moreover, it is preferable that the air conditioner of this invention has a gas-liquid separator in the said bypass line at the said compressor side of the said heat exchanger.

Therefore, according to the air conditioner of the present invention, in the case of returning the injection gas vaporized into the liquid refrigerant, or returning the gas refrigerant as the injection gas as it is, by preventing the liquid return to the compressor by separating the liquid from the injection gas Therefore, the fall of the reliability by the damage of a compressor can be prevented.

In addition, the air conditioner of the present invention has a gas-liquid separation receiver for circulating and separating the refrigerant returning to the compressor into a gas refrigerant and a liquid refrigerant, and a common line connecting the compressor, and the compressor side of the bypass line. Is connected to the common line, and the operation is switched between the injection operation and the reduce operation by opening and closing the on / off valve provided in the common line.

Therefore, according to the air conditioner of the present invention, both the injection operation and the reduce operation are enabled, and in the past, only a narrow range by the engine performance (speed control range) was able to meet the load demand, By adjusting the flow rate of the refrigerant, it is possible to respond linearly to a wide range of load demands.

Next, one Embodiment of the air conditioner which concerns on this invention is described below, referring drawings. 1 is a block diagram showing a refrigerant circulation line of the air conditioner of the first embodiment.

The air conditioner 1 cools or heats a room, and is comprised from the outdoor unit 10 and the indoor unit 30. As shown in FIG. The outdoor unit 10 is a compressor 11 which is driven by combustion of fuel gas and is driven by the gas engine 61 and the gas engine 61, and the compressor 11 which sucks and compresses the gas-type refrigerant of the accumulator 12. ), An accumulator 12 for accommodating a gaseous refrigerant (gas refrigerant) and a liquid refrigerant (liquid refrigerant) in a separated state, and an outdoor heat exchanger 15 as a heat exchanger for exchanging refrigerant for air conditioning. It is. The other indoor unit 30 is composed of an indoor heat exchanger 35 serving as a heat exchanger for exchanging refrigerant for air conditioning, an expansion valve 32 for expanding the refrigerant, and the like.

In the air conditioner 1 of this embodiment, the variable displacement type of a scroll rotation type is employ | adopted as the compressor 11 provided in the outdoor unit 10, and the gas engine 61 is a drive source through a power transmission member, such as a timing belt. It is connected. The compressor 11 is provided with a suction port 11b for sucking the refrigerant from the accumulator 12 into the compression chamber and a discharge port 11a for discharging the high pressure refrigerant compressed in the compression chamber. The compressor 11 and the accumulator 12 are connected to the common port 11c and the replenisher by a common line 53 in addition to the suction port 11b and the suction port 12b connected by the suction line 41. The deuce port 12c is also connected.

In the air conditioner 1, a receiver tank 17 for gas-liquid separating gas and liquid refrigerants is piped into a line 45 connecting the outdoor heat exchanger 15 and the indoor heat exchanger 35, The gas layer part is connected to the outdoor heat exchanger 15 side, and the liquid layer part is connected to the indoor heat exchanger 35 side, respectively. In the present embodiment, the bypass line 51 is connected to the liquid layer portion that is particularly satisfied with the liquid refrigerant in the receiver tank 17. An electromagnetic expansion valve 25 is piped to the bypass line 51 connected to the receiver tank 17, and is connected to the heat exchanger 26. The heat exchanger 26 is configured such that a coolant for cooling the gas engine 61 flows, such as the double tube heat exchanger 22 and the like, so as to obtain an injection gas by evaporating the liquid refrigerant using the engine arrangement.

Moreover, the accumulator 27 for gas-liquid separation is provided in the bypass line 52 connected to the secondary side of this heat exchanger 26, and it is comprised so that the injection gas which excludes liquid may be conveyed to the compressor 11. As shown in FIG. The accumulator 27 functions effectively when all of the liquid refrigerant cannot be gasified. Therefore, the accumulator 27 may be configured to exclude the liquid refrigerant when all of the liquid refrigerant can be gasified. Moreover, although the accumulator 12 is provided in addition to this accumulator 27 in the indoor unit 10, the former corresponds to the gas-liquid separator of Claim 5, and the latter corresponds to the gas-liquid separator of Claim 6.

The bypass line 52 connected to the accumulator 27 is connected to a common line 53 for returning the injection gas to the compressor 11 through the check valve 28, and the common line 53 is connected to the accumulator 27. It is connected to the common port 11c of the compressor 11.

By the way, as mentioned above, the gas refrigerant separated by gas-liquid separation by the receiver tank 17 was returned to the compressor as injection gas. However, in this embodiment, the injection of the liquid refrigerant is carried out by feeding the heat exchanger 26 to vaporization. As a heat source for vaporizing the liquid refrigerant, in the air conditioner 1 of the present embodiment in which the system arrangement of the air conditioner, in particular, the compressor 11 is driven by the gas engine 61, the engine arrangement is used. It is configured to use. Fig. 4 is a circuit diagram of a gasification system of liquid refrigerant using such an engine arrangement.

The engine arrangement is taken from the cooling water for cooling the gas engine 61, and is assembled in the cooling water circuit thereby. The cooling water circuit has a pump 60 for transferring and circulating the cooling water to the gas engine 61, and a gas engine 61 and an exhaust heat exchanger 62 are connected to the secondary side thereof. In this way, the cooling water conveyed by the pump 60 is calorific | heat amount from the gas engine 61, and also calorific value can also be obtained from waste gas by the exhaust heat exchanger 62. FIG. The three-way valve 63 is piped to the secondary side of the exhaust heat exchanger 62 to switch between the heat exchanger 26 and the radiator 64 to allow the cooling water to flow. A thermo valve 65 is piped to the primary side of the pump 60 and is connected to the pump 60 side and the three-way valve 63 beyond the gas engine 61 and the exhaust heat exchanger 62 so as to be switchable. . In addition, although the gasification system of such a refrigerant | coolant is not shown in figure, the outdoor heat exchanger 15, the double tube heat exchanger 22, and the heat exchanger 26 are similarly connected.

By the way, in the air conditioner 1 of this embodiment, the common line 53 to which the bypass line 52 is connected is the common port 11c of the compressor 11, and the reduce port 12c of the accumulator 12. It is connected to), and both the injection operation and the reduce operation are possible. That is, when the air conditioning demand load is high, the refrigerant flow rate per unit time supplied to the compressor 11 is increased by the injection operation. On the contrary, when the air conditioning demand load is low, the excess refrigerant in the compressor 11 is reduced to the accumulator by the reduce operation. It is a structure which returns. The common line 53 is provided with an electromagnetic expansion valve 29 for switching between the injection operation and the reduce operation.

The reason why the injection operation and the reduce operation is performed is to supplement the engine performance so that the air conditioner 1 has a capability width that can cope with a wide range from low load to high load. For example, since the gas engine 61 is used as the driving means in the air conditioner 1, the minimum rotational speed (idling rotational speed) is limited, but the engine 61 can operate in accordance with the reduce operation. It enables unprecedented low load output.

By the way, in this air conditioner 1, various apparatuses, such as the electromagnetic expansion valve 29 for switching between such injection operation and reduce operation, are controlled by the control apparatus which is not shown in figure.

Next, the operation of cooling the room with respect to the air conditioner will be described. When the gas engine 61 is driven according to the fuel gas, the compressor 11 is driven, and the gas refrigerant of the accumulator 12 is sucked into the compressor 11 from the suction port 12b through the suction line 41 and is Compressed in the compression chamber. The gas refrigerant, which has become a high temperature and high pressure by compression, is discharged from the discharge port 11a of the compressor 11. The discharged gas refrigerant reaches the oil separator 13 via the line 42, so that the oil can be separated to obtain a pure gas refrigerant. Such gas refrigerant flows to the line 43 from the first port 14a of the four-way valve 14, which is a flow path switching valve, and is transferred to the outdoor heat exchanger 15.

The high temperature and high pressure gas refrigerant is cooled by heat radiation in the outdoor heat exchanger 15, and condensed into a high temperature liquid. Thereafter, the liquid refrigerant flows down the line 44 and is decompressed by the electromagnetic expansion valve 16, but the state becomes a two-phase refrigerant from the high pressure to the low pressure therein, so that the gas refrigerant and the liquid refrigerant in the receiver tank 17 It is received separately. The liquid refrigerant having sufficient latent heat of evaporation passes from the receiver tank 17 through the filter drier 18, the ball valve 19, the line 45, and the strainer 31 through the expansion valve 32 to the expansion valve thereof. It becomes low temperature by depressurizing to (32).

Therefore, the coolant, which is a low-temperature / low-pressure two-phase coolant and is transferred from the strainer 33 to the indoor heat exchanger 35, absorbs heat from the air side when evaporated here, generates cold air, and cools the room. Thereafter, the low-temperature and low-pressure gas refrigerant flows from the line 46 and the ball valve 20 to the four-way valve 14 via the line 47. In the four-way valve 14, it enters from the 3rd port 14c, exits to the 2nd port 14b, and flows to the double pipe heat exchanger 22 further. In the cooling operation, since the double tube heat exchanger 22 does not function, the refrigerant passes through without endotherm. Then, after passing through the line 48, the accumulator 12 enters from the return port 12a and returns. The refrigerant returned in this way is accommodated in the accumulator 12 in a state separated into a liquid refrigerant and a gas refrigerant, and is again sucked and transferred to the compressor 11.

Next, the operation | movement at the time of heating a room about the air conditioner 1 is demonstrated. When the gas engine 61 is driven by the fuel gas, the compressor 11 is driven, and gaseous refrigerant in the accumulator 12 is sucked into the compressor 11 from the suction port 12b through the suction line 41. It is compressed in the compression chamber. The refrigerant thus compressed to high temperature and high pressure is discharged from the discharge port 11a of the compressor 11 and fed to the oil separator 13 from the line 42. The pure gas refrigerant from which the oil is separated by the oil separator 13 is transferred from the third port 14c of the four-way valve 14 to the indoor heat exchanger 35 through the line 47. At the time of heating, this indoor heat exchanger 35 functions as a condenser, and the high temperature and high pressure gas refrigerant turns into a high temperature liquid. Therefore, in the indoor heat exchanger 35, the refrigerant is heat-exchanged to release heat to the room to heat the room.

The refrigerant in the gas-liquid two-phase state, which is depressurized through the indoor heat exchanger 35, is transferred from the strainer 33 through the expansion valve 32 and from the strainer 31 to the line 45. Then, the ball valve 19, the filter drier 21, and the receiver tank 17 are transferred to the ball valve 19. Since a line 44 is connected to the gas layer portion of the receiver tank 17, the gas refrigerant is transferred to the outdoor heat exchanger 15 through the line 44. The gas refrigerant then enters from the first port 14a at the four-way valve 14 and exits to the second port 14b through the line 48 from the double tube heat exchanger 22 and from the return port 12a to the accumulator ( Return to 12). At this time, the cooling water of the engine flows between the indoor heat exchanger 35 and the double tube heat exchanger 22, and the gas refrigerant takes heat away from the cooling water to promote gasification and return it to the accumulator 12. The refrigerant returned in this way is accommodated in the accumulator 12 in a state separated into a liquid refrigerant and a gas refrigerant, and is sucked again and transferred to the compressor 11.

When cooling or heating operation is performed in this manner, in the air conditioner 1 of the present embodiment, if a high load request is made, the capacity increase by returning the injection gas to the compressor 11 is executed. In the air conditioner 1 shown in FIG. 1, it is comprised especially for the purpose of the improvement of heating capability. Therefore, when there is a high load request at the time of heating operation, injection operation is performed with the electromagnetic expansion valve 25 on the bypass line 51 being opened, and the electromagnetic expansion valve 29 on the common line 53 closed. Is done.

When the electromagnetic expansion valve 25 is opened, the liquid refrigerant in the receiver tank 17 flows to the bypass line 51 and is transferred to the heat exchanger 26 through the electromagnetic expansion valve 25. And the cooling water which became high temperature by the engine arrangement flows through the heat exchanger 26. As shown in FIG. That is, as shown in Fig. 4, the coolant flowing through the gas engine 61 and the exhaust heat exchanger 62 obtains heat therein, and thus the temperature becomes, for example, about 70 to 80 ° C. It is transferred to the heat exchanger 26 by switching of 63).

Therefore, the liquid refrigerant flowing through the heat exchanger 26 takes heat from the high temperature cooling water, evaporates, vaporizes it, and becomes an injection gas. In this way, the injection gas obtained from the liquid refrigerant by the heat exchanger 26 flows to the accumulator 27 and is separated into a liquid refrigerant and a gas refrigerant. Then, only the injection gas excluding the liquid flows through the bypass line 52 to the common line 53 and flows back from the common port 11c to the compressor 11. Therefore, the refrigerant which increased the flow volume per unit time is discharged from the discharge port 11a of the compressor 11, and high load operation is performed.

On the other hand, when there is a low load request, the electromagnetic expansion valve 25 on the bypass line 51 is closed, and on the contrary, the electromagnetic expansion valve 29 on the common line 53 is opened to reduce the operation. That is, surplus refrigerant in the compressor 11 flows out from the common port 11c to the common line 53 and returns to the accumulator 12. Therefore, the coolant which reduced the flow volume per unit time is discharged from the discharge port 11a of the compressor 11, and low load operation is performed.

In this way, in the air conditioner 1 of this embodiment, since the dense liquid refrigerant was taken out from the receiver tank 17, and injection gas was obtained, the injection gas compared with the conventional thing which returned the gas refrigerant as an injection gas as it is. The flow rate of can be obtained. Therefore, a large flow rate of injection gas can be returned to the compressor 11, whereby a large power can be obtained from the compressor 11, and the heating capability can be improved.

In addition, in the air conditioner 1 of this embodiment, when raising the heating air-conditioning capacity by returning the injection gas in this way, the engine array is used in the process of obtaining the injection gas from the liquid refrigerant, and therefore, the recovery efficiency of the engine array. Also became good.

Moreover, in the air conditioner 1 of this embodiment, since both the injection operation and the reduce operation were made possible, the height and width of the air-conditioning ability were widened, and the load request could be made linear. That is, as shown in Fig. 5, in the conventional air conditioner, the load request can only be satisfied by the performance (speed control range) of the gas engine 61 in the range indicated by the solid line. The range of load requirements could be expanded by extending the range of control capability. In particular, the injection range at the time of heating operation improves significantly compared with the conventional gas injection as mentioned above.

Next, a second embodiment of the air conditioner will be described. Fig. 2 is a block diagram showing the refrigerant circulation line of the air conditioner of the second embodiment. The air conditioner 2 of the present embodiment is configured to cool or heat the room in the same manner as the first embodiment. The air conditioner 2 includes the outdoor unit 70 and the indoor unit 30. However, the configuration is similar to that of the first embodiment. Since many structures are common to the air conditioner 1, the same code | symbol is attached | subjected to the same structure and detailed description is abbreviate | omitted.

The feature of this embodiment is that in the injection operation, the gas refrigerant is removed from the receiver tank 17 during the cooling operation, and the liquid refrigerant is directly extracted from the line 45 during the heating operation. As a result, the line 45 and the bypass line 51 are connected through the solenoid valve 72, and the receiver tank 17 has the bypass line 51 through the solenoid valve 71 in the gas layer part. Connected.

Therefore, in the cooling operation, the gas refrigerant is condensed in the outdoor heat exchanger 15 and separated into the gas refrigerant and the liquid refrigerant in the receiver tank 17. The liquid refrigerant in the meantime flows through the line 45 to the indoor heat exchanger 35 of the indoor unit 30, where the refrigerant absorbs heat from the air side when the refrigerant evaporates to generate cold air to cool the room.

And when the high load request | required at the time of such cooling, the solenoid valve 71 opens with the solenoid valve 72 closed. As a result, a gas injection is performed in which the gas refrigerant in the receiver tank 17 flows through the bypass lines 51 and 52 and the common line 53 and flows back to the compressor 11. In addition, since it is not necessary to warm a refrigerant | coolant by engine arrangement at the time of cooling, heat exchange is not performed in the heat exchanger 26, without cooling water flowing. That is, in the cooling water circuit shown in FIG. 4, the cooling water conveyed by the pump 12 passes through the gas engine 61 and the exhaust heat exchanger 62, and then the radiator 64 is switched by switching the three-way valve 63. ) And heat is dissipated there.

Next, in the case of heating operation of the air conditioner 2, similarly to the air conditioner 1 of the first embodiment, the indoor heat exchanger 35 functions as a condenser, and the high-temperature / high-pressure gas refrigerant has a high temperature. Becomes a liquid, and the refrigerant is heat-exchanged, whereby heat is released to the room to heat the room. And when there is a high load request, the solenoid valve 72 opens with the solenoid valve 71 closed. In this case, the refrigerant flowing from the indoor heat exchanger 35 through the line 45 is transferred to the bypass line 51, and the heat exchanger 26 takes heat from the high-temperature cooling water to vaporize it, and becomes an injection gas to form a compressor. It is returned to (11).

Therefore, in the air conditioner 2 of this embodiment, it became possible to improve a cooling capability by the gas injection at the time of cooling in addition to the improvement of a heating capability like the said 1st Embodiment.

In addition, as in the first embodiment, when the heating and air-conditioning capacity is increased by the return of the injection gas, the engine array is used in the process of obtaining the injection gas from the liquid refrigerant, so the recovery efficiency of the engine array is also improved. In addition, since both the injection operation and the reduce operation can be performed, the height and width of the air-conditioning capability can be widened to correspond to the load demand linearly (see Fig. 5).

Next, a third embodiment of the air conditioner will be described. 3 is a block diagram showing a refrigerant circulation line of the air conditioner of the third embodiment. The air conditioner 3 of the present embodiment is configured to cool or heat the room in the same manner as the first and second embodiments. The air conditioner 3 includes the outdoor unit 80 and the indoor unit 30, but the configuration thereof is the first. Since many structures are common to the air conditioner 1 of embodiment, the same code | symbol is attached | subjected to the same structure and detailed description is abbreviate | omitted.

A feature of the present embodiment is that, in the injection operation, an injection gas is obtained from the liquid refrigerant, similarly to the first embodiment, to improve the heating capacity. And although the receiver tank 17 was provided in the said 1st Embodiment, in this embodiment, the bypass line 51 is directly connected to the line 45. As shown in FIG.

Therefore, when there is a high load request in the case of heating operation of the air conditioner 2, the hot liquid refrigerant condensed by the indoor heat exchanger 35 flows in the line 45, from which the solenoid valve 72 The heat is transferred to the open bypass line 51, and heat is evaporated from the high-temperature cooling water in the heat exchanger 26 to return to the compressor 11 as an injection gas.

Therefore, in the air conditioner 3 of this embodiment, it became possible to improve a heating capability similarly to the said 1st embodiment. In particular, by excluding the receiver tank 17, the effect of simplifying the configuration and lowering the cost is obtained.

In addition, similarly to the first and second embodiments, when the heating and air conditioning capability is increased by the reflux of the injection gas, the engine array is used in the process of obtaining the injection gas from the liquid refrigerant, so that the recovery efficiency of the engine array is also improved. It became. In addition, since both the injection operation and the reduce operation can be performed, the height and width of the air conditioning capacity can be increased to correspond to the load demand linearly (see Fig. 5).

As mentioned above, although one Embodiment of the air conditioner which concerns on this invention was described, various changes are possible for this invention in the range which does not deviate from the meaning, without being limited to this.

The present invention connects a bypass line returning injection gas to a compressor directly or indirectly to a liquid line through which liquid refrigerant flows from an indoor heat exchanger to the heat exchanger during heating operation, and is fed to the bypass line. Since the liquid refrigerant is evaporated and vaporized by a heat exchanger installed on the line, and the vaporized injection gas is returned to the compressor, it is possible to provide an air conditioner having improved capability as the flow rate of the injection gas increases. It became.

In addition, the present invention is configured to evaporate the liquid refrigerant to obtain the injection gas by flowing heat from the engine to a heat exchanger installed on the bypass line to obtain a heat amount from the engine, so that when the heating air conditioning capacity is increased, By using the engine array in the process of obtaining the injection gas, it is possible to provide an air conditioner with improved recovery efficiency of the engine array.

In addition, the present invention is to connect the accumulator and the compressor in a common line, to connect the compressor side of the bypass line to the common line, and to switch the operation to injection operation and reduce operation by opening and closing the on-off valve provided in the common line. Since it is comprised, it becomes possible to provide the air conditioner which can respond linearly to the load request in a wide range by adjusting the flow volume of a refrigerant | coolant with a compressor.

Claims (6)

In an air conditioner in which a refrigerant discharged from a compressor driven by an engine is circulated through an outdoor heat exchanger and an indoor heat exchanger, and a refrigerant operation and a heating operation are performed by a heat exchange action of the refrigerant. A bypass line for returning refrigerant gas to the compressor is directly or indirectly connected to a liquid line through which liquid refrigerant flows from the indoor heat exchanger to the outdoor heat exchanger during heating operation, and the liquid fed into the bypass line. And evaporating the refrigerant by a heat exchanger provided on the line to return the vaporized refrigerant gas to the compressor. The air conditioner according to claim 1, wherein a receiver tank for separating a gas refrigerant and a liquid refrigerant is provided in the liquid line, and the bypass line is connected to a liquid layer portion of the receiver tank. 2. A receiver tank according to claim 1, wherein a receiver tank for separating a gas refrigerant and a liquid refrigerant is provided in the liquid line, and the bypass line is connected to the gas layer and the liquid line of the receiver tank, respectively, via an open / close valve. Air conditioner. The heat exchanger installed on the bypass line is configured to evaporate a liquid refrigerant to obtain a refrigerant gas by flowing a cooling water that obtains heat from the engine and heats it at a high temperature. Air conditioner. The air conditioner according to any one of claims 1 to 3, wherein the bypass line has a gas-liquid separator on the compressor side of the heat exchanger. The gas-liquid separation receiver according to any one of claims 1 to 3, which has a refrigerant that circulates and returns to the compressor, separated into a gas refrigerant and a liquid refrigerant, and a common line connecting the compressor. And the compressor side of the bypass line is connected to the common line, and the operation is switched between the injection operation and the reduce operation by opening and closing the on / off valve provided in the common line.