JPH09159303A - Heating and cooling unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the comfortableness and the heating efficiency in a heating and cooling unit to perform the cooling and heating using the refrigerant heated by the hot gas in the combustion. SOLUTION: A third opening/closing valve 34 is provided parallel to an ejector 8 in the middle of a fifth connection pipe 19, a second throttling device 35 and a second non-return valve 36 are provided in parallel in the middle of a seventh connection pipe 24, and in the case of the heating operation with a large load such as the case in which the operation is started when the outside temperature is low, first and second opening/closing valves 30, 32 are opened, and the third opening/closing valve 34 is closed, and not only the combustion heat of a combustion part 16 but also the outdoor atmospheric heat can be utilized for the heating through an indoor heat exchanger 23, and the room temperature rapidly rises. In the case of the regular heating operation, because the third opening/closing valve 34 is opened, and the vapor refrigerant from a heater 3 is bypassed through an ejector 8, the flow passage resistance can be reduced, and the efficiency of the heating operation can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling / heating apparatus that heats a refrigerant with a high temperature gas such as a combustion gas and cools and heats the heated refrigerant.

[0002]

2. Description of the Related Art Heretofore, as a cooling device for an automobile of this type, a cooling device as disclosed in JP-A-57-134668 has been generally used. The configuration will be described below with reference to FIG. As shown in FIG. 10, a heater 3 that heats and evaporates the refrigerant sent from the refrigerant pump 2 by utilizing the heat of the cooling water of the engine of the automobile flowing through the heat exchange tube 1 and the heat of the exhaust gas, and steam. A condenser 4 for condensing and liquefying a refrigerant, a heater outlet 5 of the heater 3, and a first connecting pipe 6 having one end connected to the inlet and the other end connected to the inlet of the condenser 4.
And, the refrigerant vapor sent from the heater 3 provided in the middle of the first connecting pipe 6 is ejected toward the condenser 4, and the low-pressure refrigerant vapor is sucked from the suction port 7 provided on the side. An ejector 8, a second connecting pipe 10 having one end connected to the liquid refrigerant outlet of the condenser 4 and the other end connected to the inlet side of an evaporator 9 for evaporating the liquid refrigerant, and the outlet side of the evaporator 9. To the third connecting pipe 11 whose one end is connected to the suction port 7 of the ejector 8 and another branching point 12 in the middle of the second connecting pipe 10 to heat the heater 3. Vessel entrance 13
And a fourth connecting pipe 14 connected to the. The refrigerant pump 2 for pumping the liquid refrigerant is provided in the middle of the fourth connecting pipe 14, and further, in the middle of the second connecting pipe 10, from the branch point 12 to the evaporator 9 side. A device 15 is provided.

When the inside of a vehicle is cooled by such a cooling device, the cooling water or exhaust gas of the vehicle engine sent into the heat exchange tube 1 and the liquid refrigerant sent from the refrigerant pump 2 are heaters. Heat is exchanged inside the liquid refrigerant 3, and the liquid refrigerant is evaporated into high-pressure vapor and enters the ejector 8.
This high-pressure vapor refrigerant is ejected at a high speed from the nozzle 8a of the ejector 8, so that the pressure in the mixing chamber 8b of the ejector 8 decreases and becomes a negative pressure. As a result, since the evaporator 9 also has a negative pressure through the third connecting pipe 11 connected to the suction port 7, a part of the liquid refrigerant condensed and liquefied in the condenser 4 is sucked through the third connecting pipe 11. The ejector 8 is sucked from the mouth 7. When this liquid refrigerant evaporates in the evaporator 9, heat is taken from the surroundings to generate a cooling effect. The high-temperature and high-pressure steam sent from the first connecting pipe 6 and the low-temperature and low-pressure steam sent from the third connecting pipe 11 are mixed by the ejector 8, and further enter the condenser 4 to remove the heat of condensation. Discharge to condense and liquefy.
Then, a part of this liquid refrigerant enters the evaporator 9 through the second connecting pipe 10 as described above, and the other refrigerant passes through the fourth connecting pipe 14 and is sucked into the refrigerant pump 2.

The conventional example shown in FIG. 10 is a cooling-only device. By applying the conventional example of FIG. 10, a configuration as shown in FIG. 11 is conceivable as a general cooling and heating device capable of both cooling and heating. Hereinafter, the configuration will be described with reference to FIG. As shown in FIG. 11, this cooling and heating device includes a heater 3 that heats and evaporates the refrigerant sent from the refrigerant pump 2 by using the heat generated in the combustion section 16, and a refrigerant circuit during cooling operation and heating operation. Four-way valve to switch 17
And a fifth connecting pipe 19 having one end connected to the heater outlet 5 of the heater 3 and the other end connected to the first connecting port 18 of the four-way valve 17, and the middle of the fifth connecting pipe 19. An ejector 8 for ejecting the steam sent from the heater 3 provided in the first direction toward the first connection port 18 of the four-way valve 17 and sucking the low-pressure vapor refrigerant from the suction port 7 provided on the side; Four-way valve 1
The second connecting port 20 of 7 has one end connected to the outdoor heat exchanger 21 and a sixth connecting pipe 22 having the other end connected to the outdoor heat exchanger 21 which condenses and liquefies the vapor refrigerant during cooling. A seventh connecting pipe 24 connected to the indoor heat exchanger 23, the other end of which is an evaporator during cooling and a condenser during heating, and one end of which is connected to the indoor heat exchanger 23, and the other end is connected to the four sides. Valve 1
An eighth connecting pipe 26 connected to the third connecting port 25 of 7,
A ninth connecting pipe 28 having one end connected to the fourth connecting port 27 of the four-way valve 17 and the other end connected to the suction port 7 of the ejector 8, and a branch point in the middle of the seventh connecting pipe 24. It is composed of a tenth connecting pipe 29 branched from 12 and connected to the heater inlet 13 of the heater 3. A first on-off valve 30 is provided on the outdoor heat exchanger 21 side from the branch point 12 in the middle of the seventh connection pipe 24, and the indoor heat exchanger 2
A first expansion device 15 and a first check valve 31 are provided in parallel on the third side. Further, a second opening / closing valve 32 is provided in the middle of the ninth connecting pipe 28. Reference numeral 33 is a heater temperature detecting means for detecting the refrigerant temperature of the heater 3.

When the cooling operation is performed by such an air conditioner, the four-way valve 17 has the first and second connection ports 18, 20.
And the four-way valve 17 is switched so that the third and fourth connection ports 25 and 27 are communicated with each other, and further, the first opening / closing valve 3
0 and the second on-off valve 32 are opened. In the case where the heat source of the heater 3 is the cooling water or the exhaust gas of the automobile engine in the case of FIG. 10, there is a difference in the case of the general combustion section 16 in the case of FIG. The description is omitted because it is the same as the case.

Next, when the heating operation is performed, the four-way valve 17 is switched so that the first and third connection ports 18 and 25 and the second and fourth connection ports 20 and 27 of the four-way valve 17 are connected, respectively. The first on-off valve 30 and the second on-off valve 32 are closed. The combustion gas generated in the combustion section 16 and the liquid refrigerant sent from the refrigerant pump 2 exchange heat in the heater 3, and the liquid refrigerant evaporates into high-pressure vapor and enters the ejector 8. Then, this vapor refrigerant passes through the four-way valve 17 and is condensed and liquefied in the indoor heat exchanger 23. When this vapor refrigerant is condensed in the indoor heat exchanger 23, heat is released to the surroundings to generate a heating effect. The condensed liquid refrigerant passes through the check valve 31 and is sucked into the refrigerant pump 2.

[0007]

However, the conventional cooling and heating apparatus has a problem that the heating load is large and the indoor temperature does not rise easily when the heating operation is started when the outdoor temperature is low.

Further, during heating operation, the refrigerant flowing out of the heater 3 becomes high temperature and high temperature due to the flow path resistance of the nozzle 8a of the ejector 8, so that there is a problem that heat radiation loss is large and efficiency is deteriorated.

When the heating operation is stopped, the refrigerant may leak from the four-way valve 17 and the first opening / closing valve 30 into the refrigerant circuit such as the outdoor heat exchanger 21 which is not used during the heating operation. Therefore, when the heating operation is stopped for a relatively long time, the refrigerant in the heating circuit runs short, and when the heating operation is restarted, the heater temperature detecting means 33 provided on the refrigerant passage surface of the heater 3 is provided.
Since the heating operation is stopped by detecting the abnormal overheating of the refrigerant, stable heating operation cannot be performed and there is a problem in terms of comfort.

Further, during the heating operation, the refrigerant may leak from the four-way valve 17 and the first on-off valve 30 into the refrigerant circuit such as the outdoor heat exchanger 21 which is not used during the heating operation.
Therefore, when the heating operation is continued for a long time, the refrigerant in the heating circuit runs short, and the heater temperature detecting means 33 provided on the surface of the refrigerant passage of the heater 3 detects abnormal overheating of the refrigerant during the heating operation, There was a problem in terms of comfort because stable heating operation could not be performed.

The present invention is to solve such a conventional problem and to speed up the start-up of room temperature when the heating load is large, improve the efficiency of heating operation, and ensure stable heating operation. The purpose is to improve comfort during heating.

[0012]

In order to achieve the above-mentioned object, the present invention speeds up the start-up of room temperature when the heating load is large,
Further, in order to improve the efficiency of heating operation, a heater that exchanges heat with the combustion gas generated in the combustion section, a four-way valve that switches the refrigerant circuit during cooling operation and heating operation, and one end at the outlet of the heater, A fifth connecting pipe having the other end connected to the first connecting port of the four-way valve, and a first connecting port of the four-way valve which is provided in the middle of the fifth connecting pipe and is sent from a heater. Ejector that injects toward low temperature and sucks low-pressure vapor refrigerant from the intake port on the side, and one end is connected to the second connection port of the four-way valve, and the other end is condensed and liquefied during cooling. A sixth connecting pipe connected to the outdoor heat exchanger, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which serves as an evaporator during cooling and a condenser during heating. The seventh connecting pipe equipped with the on-off valve and one end is connected to the indoor heat exchanger and the other end is connected. An eighth connecting pipe connected to the third connecting port of the four-way valve and one end of the fourth connecting port of the four-way valve, the other end of which is connected to the intake port of the ejector to form a second opening / closing valve. A ninth connecting pipe provided with, a tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe, connected to the inlet of the heater and provided with a refrigerant pump, and a fifth connecting pipe. The third opening / closing valve provided in parallel with the ejector in the middle of the above, the second throttle device and the second check valve connected in parallel in the middle of the seventh connecting pipe.

According to the present invention, when the heating load is large such as when the heating operation is started at a low outdoor temperature, the high-temperature and high-pressure vapor refrigerant discharged from the heater is sent to the ejector, and the outdoor heat exchanger is discharged from the suction port of the ejector. Since the low-pressure refrigerant is sucked, the outdoor heat of the atmosphere can be added to the heating, so that the heating capacity becomes high and the comfort can be improved. Furthermore, during normal heating operation, the vapor refrigerant that has flowed out of the heater bypasses the ejector and flows, so the refrigerant temperature decreases by the amount that the flow path resistance decreases, and the heat dissipation loss can also decrease. It is possible to improve the efficiency of.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present invention comprises a heater for exchanging heat with the combustion gas generated in the combustion section, and a four-way valve for switching the refrigerant circuit during cooling operation and heating operation.
A fifth connection pipe, one end of which is connected to the outlet of the heater and the other end of which is connected to the first connection port of the four-way valve, and which is provided in the middle of the fifth connection pipe and is fed from the heater An ejector, which ejects toward the first connection port of the four-way valve and sucks low-pressure vapor refrigerant from a suction port provided on the side, and one end of which is connected to the second connection port of the four-way valve, and the other end of which A sixth connecting pipe connected to the outdoor heat exchanger that condenses and liquefies the vapor refrigerant during cooling, and one end is connected to the outdoor heat exchanger, and the other end becomes an evaporator during cooling and a condenser during heating. A seventh connecting pipe connected to the indoor heat exchanger and having a first opening / closing valve, and an eighth connecting one end to the indoor heat exchanger and the other end to the third connecting port of the four-way valve. One end is connected to the connection pipe of and the fourth connection port of the four-way valve, and the other end is connected to the suction port of the ejector. A ninth connection pipe provided with the closed, and the seventh branches from the middle of the branch point of the connecting pipe, the tenth connecting tube provided with the connection to the coolant pump to the inlet of said heater,
A third opening / closing valve provided in parallel with the ejector in the middle of the fifth connection pipe, and a second throttle device and a second check valve connected in parallel in the middle of the seventh connection pipe were provided. It is a thing.

According to the present invention, when the heating load is large such as when the heating operation is started at a low outdoor temperature, the high-temperature and high-pressure vapor refrigerant discharged from the heater is sent to the ejector, and the intake port of the ejector is used to supply the outdoor heat exchanger. Since the low-pressure refrigerant is sucked, the atmospheric heat outside the room can be added to the heating, so that the heating capacity becomes high and the comfort can be improved. Furthermore, during normal heating operation, the vapor refrigerant that has flowed out of the heater bypasses the ejector and flows, so the refrigerant temperature decreases by the amount that the flow path resistance decreases, and the heat dissipation loss can also decrease. It is possible to improve the efficiency of.

According to a second aspect of the present invention, a heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit during cooling operation and heating operation, and one end at the outlet of the heater are provided. A fifth connecting pipe having the other end connected to the first connecting port of the four-way valve, and a first connecting port of the four-way valve which is provided in the middle of the fifth connecting pipe and is sent from the heater. One end is connected to the ejector that ejects toward the ejector and sucks low-pressure vapor refrigerant from the side-intake port and the second connection port of the four-way valve, and the other end is condensed and liquefied during cooling. A sixth connecting pipe connected to the outdoor heat exchanger, one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to the indoor heat exchanger which serves as an evaporator during cooling and serves as a condenser during heating. A seventh connecting pipe equipped with an on-off valve and one end is connected to the indoor heat exchanger, and the other end is connected to the front. An eighth connecting pipe connected to the third connecting port of the four-way valve and one end of the fourth connecting port of the four-way valve are connected, and the other end is connected to the suction port of the ejector to form a second opening / closing valve. A ninth connecting pipe provided, and a tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe, connected to the inlet of the heater and provided with a refrigerant pump, and a fifth connecting pipe. A third on-off valve provided in parallel with the ejector on the way, a second throttle device and a second check valve connected in parallel on the way of the seventh connecting pipe, an outside air temperature detecting means, and a certain setting When the outside air temperature obtained from the outside air temperature detecting means is higher than the predetermined temperature, the atmospheric heat absorption combustion heating operation is performed, and when the outside air temperature is low, the combustion heating operation is performed. And a controller for controlling the opening / closing operation of the opening / closing valve.

According to the present invention, the atmospheric heat absorption combustion heating operation in which the outdoor heat is also added to the heating and the normal combustion heating operation are switched to the more efficient one according to the outside air temperature. It is possible to improve.

According to a third aspect of the present invention, a heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit during the cooling operation and the heating operation, and one end at the outlet of the heater are provided. A fifth connecting pipe having the other end connected to the first connecting port of the four-way valve, and a first connecting port of the four-way valve which is provided in the middle of the fifth connecting pipe and is sent from a heater. Ejector that injects toward low temperature and sucks low-pressure vapor refrigerant from the intake port on the side, and one end is connected to the second connection port of the four-way valve, and the other end is condensed and liquefied during cooling. A sixth connecting pipe connected to the outdoor heat exchanger, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which serves as an evaporator during cooling and a condenser during heating. The seventh connecting pipe equipped with the on-off valve and one end is connected to the indoor heat exchanger and the other end is connected. An eighth connecting pipe connected to the third connecting port of the four-way valve and one end of the fourth connecting port of the four-way valve, the other end of which is connected to the intake port of the ejector to form a second opening / closing valve. A ninth connecting pipe provided with, a tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe, connected to the inlet of the heater and provided with a refrigerant pump, and a fifth connecting pipe. There is a third on-off valve provided in parallel with the ejector in the middle of, a second throttle device and a second check valve connected in parallel in the middle of the seventh connection pipe, and an outside air temperature detecting means. When the outside air temperature obtained from the outside air temperature detecting means is higher than the set predetermined temperature, the atmospheric heat absorption combustion heating operation is performed,
A controller for controlling the opening / closing operations of the first, second and third opening / closing valves so as to perform the combustion heating operation when the temperature is low.

According to the present invention, the atmospheric heat absorption combustion heating operation in which the outdoor heat is also added to the heating and the normal combustion heating operation are switched by the difference between the outside air temperature and the evaporation temperature, so that the efficiency of the heating operation is improved. It will be possible.

According to a fourth aspect of the present invention, there is provided a heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit during the cooling operation and the heating operation, and one end at the outlet of the heater. A fifth connecting pipe having the other end connected to the first connecting port of the four-way valve, and a first connecting port of the four-way valve which is provided in the middle of the fifth connecting pipe and is sent from a heater. Ejector that injects toward low temperature and sucks low-pressure vapor refrigerant from the intake port on the side, and one end is connected to the second connection port of the four-way valve, and the other end is condensed and liquefied during cooling. A sixth connecting pipe connected to the outdoor heat exchanger, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which serves as an evaporator during cooling and a condenser during heating. The seventh connecting pipe equipped with the on-off valve and one end is connected to the indoor heat exchanger and the other end is connected. An eighth connecting pipe connected to the third connecting port of the four-way valve and one end of the fourth connecting port of the four-way valve, the other end of which is connected to the intake port of the ejector to form a second opening / closing valve. A ninth connecting pipe provided with, a tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe, connected to the inlet of the heater and provided with a refrigerant pump, and a fifth connecting pipe. A third on-off valve provided in parallel with the ejector in the middle of the, the second throttle device and the second check valve connected in parallel in the middle of the seventh connecting pipe, the outside air temperature detecting means, and the outdoor Refrigerant temperature detection means provided on the heat transfer tube surface of the heat exchanger, the difference between the outside air temperature obtained from the outside air temperature detection means and the refrigerant temperature obtained from the refrigerant temperature detection means during the atmospheric heat absorption combustion heating operation Consisting of a controller that controls the combustion unit and the refrigerant pump so that the temperature difference becomes a predetermined temperature difference. A.

According to the present invention, during the atmospheric heat absorption combustion heating operation in which the outdoor atmospheric heat is also added to the heating, the combustion amount is controlled so that the evaporation temperature is optimum for the outside air temperature, so that the efficiency of the heating operation is improved. Is possible.

According to a fifth aspect of the present invention, a heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit during cooling operation and heating operation, and one end of the heater at the outlet are provided. A fifth connecting pipe having the other end connected to the first connecting port of the four-way valve, and a first connecting port of the four-way valve which is provided in the middle of the fifth connecting pipe and is sent from the heater. One end is connected to the ejector that ejects toward the ejector and sucks low-pressure vapor refrigerant from the side-intake port and the second connection port of the four-way valve, and the other end is condensed and liquefied during cooling. A sixth connecting pipe connected to the outdoor heat exchanger, one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to the indoor heat exchanger which serves as an evaporator during cooling and serves as a condenser during heating. A seventh connecting pipe equipped with an on-off valve and one end is connected to the indoor heat exchanger, and the other end is connected to the front. An eighth connecting pipe connected to the third connecting port of the four-way valve and one end of the fourth connecting port of the four-way valve are connected, and the other end is connected to the suction port of the ejector to form a second opening / closing valve. A ninth connecting pipe provided, and a tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe, connected to the inlet of the heater and provided with a refrigerant pump, and a fifth connecting pipe. A third opening / closing valve provided in parallel with the ejector on the way, the first,
The controller comprises a controller for controlling opening / closing of the second and third opening / closing valves and switching of the four-way valve.

According to the present invention, when the heating operation is started, the high-temperature and high-pressure vapor refrigerant discharged from the heater is sent to the ejector, and the low-pressure refrigerant of the outdoor heat exchanger is sucked from the intake port of the ejector to allow the refrigerant in the heating refrigerant circuit. Therefore, the required amount of refrigerant can be always secured in the heating refrigerant circuit, stable heating operation can be performed, and comfort can be improved.

According to a sixth aspect of the present invention, there is provided a heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit between the cooling operation and the heating operation, and one end at the outlet of the heater. A fifth connecting pipe having the other end connected to the first connecting port of the four-way valve, and a first connecting port of the four-way valve which is provided in the middle of the fifth connecting pipe and is sent from a heater. Ejector that injects toward low temperature and sucks low-pressure vapor refrigerant from the intake port on the side, and one end is connected to the second connection port of the four-way valve, and the other end is condensed and liquefied during cooling. A sixth connecting pipe connected to the outdoor heat exchanger, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which serves as an evaporator during cooling and a condenser during heating. The seventh connecting pipe equipped with the on-off valve and one end is connected to the indoor heat exchanger and the other end is connected. An eighth connecting pipe connected to the third connecting port of the four-way valve and one end of the fourth connecting port of the four-way valve, the other end of which is connected to the intake port of the ejector to form a second opening / closing valve. A ninth connecting pipe provided with, a tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe, connected to the inlet of the heater and provided with a refrigerant pump, and a fifth connecting pipe. The third on-off valve provided in parallel with the ejector in the middle of the, the heater temperature detection means provided on the heat transfer tube surface of the heater, the refrigerant obtained from the heater temperature detection means during combustion heating operation And a controller for controlling the switching from the combustion heating operation to the refrigerant recovery operation when the temperature is higher than a predetermined set refrigerant temperature.

According to the present invention, the refrigerant temperature of the heater is detected during the heating operation, and when the refrigerant temperature leaks to the cooling-only refrigerant circuit to some extent, the refrigerant is recovered in the heating refrigerant circuit. The required amount of refrigerant can be always secured inside, stable heating operation is possible, and comfort can be improved.

The first embodiment of the present invention will be described below with reference to FIG. FIG. 1 is a system configuration diagram of Embodiment 1 of the present invention.

In FIG. 1, the difference from FIG. 11 of the conventional example is that a third opening / closing valve 34 is provided in parallel with the ejector 8 in the middle of the fifth connecting pipe 19, and further the seventh connecting pipe 24 is provided.
The second throttling device 35 and the second check valve 36 are provided in parallel in the middle of.

The operation of the above configuration will be described. First,
When performing the cooling operation, the four-way valve 17 is switched so that the first and second connection ports 18 and 20 and the third and fourth connection ports 25 and 27 of the four-way valve 17 are connected to each other, and further, the first and second connection ports are connected. The second opening / closing valves 30 and 32 are opened, and the third opening / closing valve 34 is closed. In the case where the heat source of the heater 3 is the cooling water or the exhaust gas of the automobile engine in the case of FIG. 10, there is a difference in the case of the general combustion section 16 in the case of FIG. Since it is similar to the case of FIG. 11 and FIG.

Next, in the case of the atmospheric heat absorption combustion heating operation when the load is large such as the start of operation at low outside air temperature, the first and third connection ports 18 and 25 of the four-way valve 17 and the second and second connection ports are provided. Four-way valve 17 so that the four connection ports 20 and 27 communicate with each other
And the first and second on-off valves 30, 3
2 is opened and the third on-off valve 34 is closed.
The combustion gas generated in the combustion section 16 and the liquid refrigerant sent from the refrigerant pump 2 exchange heat in the heater 3, and the liquid refrigerant evaporates into high-pressure vapor and enters the ejector 8. This high-pressure vapor refrigerant is ejected at a high speed from the nozzle 8a of the ejector 8, so that the pressure in the mixing chamber 8b of the ejector 8 decreases and becomes a negative pressure. As a result, since the outdoor heat exchanger 21 also has a negative pressure through the ninth connecting pipe 28 and the sixth connecting pipe 22 connected to the suction port 7, a part of the liquid refrigerant condensed and liquefied in the indoor heat exchanger 23 is obtained. Is a branch point 12, a seventh connecting pipe 24,
It is sucked from the suction port 7 to the ejector 8 through the outdoor heat exchanger 21, the sixth connecting pipe 22, the ninth connecting pipe 28, and the like. When this liquid refrigerant evaporates in the outdoor heat exchanger 21, it absorbs heat from the outdoor atmosphere. The high-temperature and high-pressure steam sent from the fifth connection pipe 19 and the low-temperature and low-pressure steam sent from the ninth connection pipe 28 are mixed by the ejector 8, and further enter the indoor heat exchanger 23 to be condensed. Liquefy. When condensed and liquefied, the heat of condensation is radiated into the room for heating.
Then, as described above, a part of the liquid refrigerant enters the outdoor heat exchanger 21 through the seventh connection pipe 24, and the other refrigerant is sucked into the refrigerant pump 2 through the tenth connection pipe 29. .

Next, in the case of the normal combustion heating operation, the four-way valve is configured so that the first and third connection ports 18 and 25 and the second and fourth connection ports 20 and 27 of the four-way valve 17 communicate with each other. 17, the first and second on-off valves 3
0 and 32 are closed, and the third opening / closing valve 34 is opened. The combustion gas generated in the combustion unit 16 and the liquid refrigerant sent from the refrigerant pump 2 exchange heat in the heater 3, and the liquid refrigerant evaporates to become vapor, and the third on-off valve 34 and the four-way valve It is condensed and liquefied in the indoor heat exchanger 23 through the valve 17. When this vapor refrigerant is condensed in the indoor heat exchanger 23, heat is released to the surroundings to generate a heating effect. The condensed liquid refrigerant is sucked into the refrigerant pump 2 through the branch point 12.

According to the first embodiment of the present invention, in the heating operation when the load is large such as the start of operation at a low outdoor temperature, the heat from the outdoor atmosphere is also heated in addition to the combustion heat of the combustion section 16. Since it is used for, the large heating capacity can be obtained, the room temperature can be started up quickly, and the heating efficiency can be improved. Also, in the case of normal heating operation, since the vapor refrigerant that has flowed out of the heater flows by bypassing the ejector, the refrigerant temperature decreases as much as the flow path resistance decreases, and the heat radiation loss can also be reduced. Driving efficiency is improved.

The second on-off valve 32 of the first embodiment
Alternatively, a check valve may be used so as to flow from the fourth connection port 27 of the four-way valve 17 toward the suction port 7 of the ejector 8 to obtain the same effect.

Next, a second embodiment of the present invention will be described with reference to FIG. 2 is a system diagram of Embodiment 2 of the present invention.

In FIG. 2, the difference from the first embodiment of FIG. 1 is that the outside temperature obtained by the output signal of the outside temperature detecting means 38 for detecting the outdoor temperature by the controller 37
Controlling the opening / closing operation of the first, second and third opening / closing valves 30, 32, 34.

The operation of the above configuration will be described. There are three types of operation: air-cooling operation, atmospheric heat absorption combustion heating operation when the load is large such as operation start at low outside temperature, and normal combustion heating operation. The operation and action of these three types of operation are the same as those of the first embodiment shown in FIG.

Next, switching between the atmospheric heat absorption combustion heating operation and the normal combustion heating operation during the heating operation will be described. FIG. 3 shows the change in heating efficiency when the outside air temperature changes, with the outside air temperature on the horizontal axis and the efficiency on the vertical axis. In the figure, the dotted line indicates the case of normal combustion heating, and the efficiency does not change much even if the outside air temperature changes. Further, the solid line shows the case of the atmospheric heat absorption combustion heating operation, and the efficiency changes with changes in the outside air temperature. This is because when the high-pressure vapor refrigerant is injected from the nozzle 8a of the ejector 8 at high speed, the pressure in the mixing chamber 8b of the ejector 8 decreases and becomes a negative pressure. As a result, the outdoor heat exchanger 21 also has a negative pressure, but the temperature of the refrigerant in the outdoor heat exchanger 21 at this time becomes a temperature determined by the negative pressure. Further, the amount of heat that the outdoor heat exchanger 21 absorbs from the outdoor atmosphere as an evaporator increases as the temperature difference between the outside air temperature and the temperature of this refrigerant increases, so that the efficiency is as shown in FIG. In the figure, when the outside air temperature at the point where the efficiency of the atmospheric heat absorption combustion heating operation intersects with the efficiency of the normal combustion heating operation is T, if the outside air temperature is higher than T, the atmospheric heat absorption combustion heating operation is performed, and T If it is lower, the normal combustion heating operation will be performed, resulting in efficient operation.

Therefore, if the outside air temperature obtained from the output signal of the outside air temperature detecting means 38 is an outside air temperature higher than T, the controller 37 opens the first and second opening / closing valves 30 and 32, and The atmospheric heat absorption combustion heating operation is performed with the third on-off valve 34 closed. On the contrary, if the outside air temperature obtained from the output signal of the outside air temperature detecting means 38 is the outside air temperature lower than T, the controller 37 causes the first and second on-off valves 30, 32 to be opened.
Is closed and the third on-off valve 34 is opened to perform a normal combustion heating operation.

According to the second embodiment of the present invention, the atmospheric heat absorption combustion heating operation and the normal combustion heating operation are switched to the more efficient one depending on the outside air temperature, so that the efficiency of the heating operation is improved.

The second on-off valve 32 of the second embodiment
Alternatively, a check valve may be used so as to flow from the fourth connection port 27 of the four-way valve 17 toward the suction port 7 of the ejector 8 to obtain the same effect.

Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 4 is a system diagram of Embodiment 3 of the present invention.

In FIG. 4, the difference from the first embodiment of FIG. 1 is that the controller 37 obtains the outside air temperature obtained from the output signal of the outside air temperature detecting means 38 for detecting the outside temperature and the outside heat exchanger 21. Refrigerant temperature detecting means 39 for detecting the refrigerant temperature
The opening / closing operations of the first, second and third opening / closing valves 30, 32, 34 are controlled by the difference with the refrigerant temperature obtained from the output signal.

The operation of the above configuration will be described. There are three types of operation: air-cooling operation, atmospheric heat absorption combustion heating operation when the load is large such as operation start at low outside temperature, and normal combustion heating operation. The operation and action of these three types of operation are the same as those of the first embodiment shown in FIG.

Next, the switching from the atmospheric heat absorption combustion heating operation to the normal combustion heating operation during the heating operation will be described. In the atmospheric heat absorption combustion heating operation, when the high-pressure vapor refrigerant is injected from the nozzle 8a of the ejector 8 at high speed, the pressure in the mixing chamber 8b of the ejector 8 decreases and becomes a negative pressure. As a result, the outdoor heat exchanger 21 also has a negative pressure, but the temperature of the refrigerant in the outdoor heat exchanger 21 at this time becomes a temperature determined by the negative pressure. Further, the amount of heat that the outdoor heat exchanger 21 absorbs from the outdoor atmosphere as an evaporator increases as the temperature difference between the outside air temperature and the temperature of this refrigerant increases. vice versa,
When the outside air temperature becomes lower than the temperature of the refrigerant, the outdoor heat exchanger 21 radiates heat to the outdoor atmosphere as a condenser, which is a waste of energy. Now, the temperature difference obtained by subtracting the temperature of the refrigerant from the outside air temperature at which the outdoor heat exchanger 21 as an evaporator can absorb heat from the outdoor atmosphere is represented by ΔT.

Therefore, during the atmospheric heat absorption combustion heating operation, the refrigerant temperature detecting means 3 for detecting the outside air temperature obtained from the output signal of the outside air temperature detecting means 38 and the refrigerant temperature of the outdoor heat exchanger 21.
The difference from the refrigerant temperature obtained from the output signal of 9 is the temperature difference Δ
If it is larger than T, the controller 37 continues the atmospheric heat absorption combustion heating operation with the opening / closing of the first, second and third opening / closing valves 30, 32, 34 left unchanged. Conversely, the difference between the outside air temperature obtained from the output signal of the outside air temperature detecting means 38 and the refrigerant temperature obtained from the output signal of the refrigerant temperature detecting means 39 for detecting the refrigerant temperature of the outdoor heat exchanger 21 is the temperature difference ΔT. If smaller, the controller 37 closes the first and second opening / closing valves 30 and 32 and opens the third opening / closing valve 34 to perform a normal combustion heating operation.

According to the third embodiment of the present invention, if the difference between the outside air temperature and the refrigerant temperature of the outdoor heat exchanger is small, efficient heating from atmospheric heat absorption combustion heating operation to normal combustion heating operation is performed. Since it is switched to, the efficiency of heating operation is improved.

The second on-off valve 32 of the third embodiment
Alternatively, a check valve may be used so as to flow from the fourth connection port 27 of the four-way valve 17 toward the suction port 7 of the ejector 8 to obtain the same effect.

Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 5 is a system diagram of Embodiment 4 of the present invention.

In FIG. 5, the difference from the first embodiment shown in FIG. 1 is that the controller 37 detects the outside temperature and the outside heat exchanger 21 from the output signal of the outside temperature detecting means 38 for detecting the outside temperature. Refrigerant temperature detecting means 39 for detecting the refrigerant temperature
The difference from the refrigerant temperature obtained from the output signal of the combustion unit 1
6 and the refrigerant pump 2 are controlled.

The operation of the above configuration will be described. There are three types of operation: air-cooling operation, atmospheric heat absorption combustion heating operation when the load is large such as operation start at low outside temperature, and normal combustion heating operation. The operation and action of these three types of operation are the same as those of the first embodiment shown in FIG.

Next, the atmospheric heat absorption combustion heating operation will be described in detail. In the atmospheric heat absorption combustion heating operation, when the high-pressure vapor refrigerant is injected from the nozzle 8a of the ejector 8 at high speed, the pressure in the mixing chamber 8b of the ejector 8 decreases and becomes a negative pressure. As a result, the outdoor heat exchanger 21 also has a negative pressure,
The temperature of the refrigerant in the outdoor heat exchanger 21 at this time is a temperature determined by the negative pressure. In addition, the outdoor heat exchanger 21
As the evaporator, the amount of heat absorbed from the outdoor atmosphere increases as the temperature difference between the outside air temperature and the temperature of the refrigerant increases. On the contrary, when the outside air temperature becomes lower than the temperature of the refrigerant, the outdoor heat exchanger 21 radiates heat to the outdoor atmosphere as a condenser, which is a waste of energy. Also,
The pressure of the refrigerant in the outdoor heat exchanger 21, that is, the evaporation temperature, is related to the flow rate of the refrigerant of the high-pressure steam that is injected at high speed from the nozzle 8a of the ejector 8 as described above. The higher the flow velocity, the lower the refrigerant pressure, that is, the evaporation temperature. Now, the temperature difference obtained by subtracting the temperature of the refrigerant from the outside air temperature at which the outdoor heat exchanger 21 can efficiently absorb heat from the outdoor atmosphere as the evaporator is ΔT.
e.

FIG. 6 shows the change in the evaporation temperature of the outdoor heat exchanger when the combustion amount changes during the atmospheric heat absorption combustion heating operation, with the horizontal axis representing the combustion amount and the vertical axis representing the evaporation temperature. Is. In the figure, the solid line shows the relationship between the combustion amount and the evaporation temperature at the outside air temperature Ta (shown by the one-dot chain line in the figure), and the dotted line shows the evaporation temperature plus the temperature difference ΔTe. As is clear from the figure, the required combustion amount is the combustion amount determined by the intersection of the alternate long and short dash line (outside air temperature Ta) and the dotted line (evaporation temperature + ΔTe).

Therefore, during the atmospheric heat absorption combustion heating operation, the refrigerant temperature detecting means 3 for detecting the outside air temperature obtained from the output signal of the outside air temperature detecting means 38 and the refrigerant temperature of the outdoor heat exchanger 21.
The difference from the refrigerant temperature obtained from the output signal of 9 is the temperature difference Δ
If it is larger than Te, the difference between the two output signals is ΔT.
The controller 37 reduces the combustion amount of the combustor 16 and the rotation speed of the refrigerant pump 2 so that e becomes e. Conversely, the difference between the outside air temperature obtained from the output signal of the outside air temperature detecting means 38 and the refrigerant temperature obtained from the output signal of the refrigerant temperature detecting means 39 for detecting the refrigerant temperature of the outdoor heat exchanger 21 is the temperature difference ΔT. If it is smaller, the controller 37 increases the combustion amount of the combustion section 16 and the rotation speed of the refrigerant pump 2 so that the difference between the two output signals becomes ΔTe.

According to the fourth embodiment of the present invention, the difference between the outside air temperature and the refrigerant temperature of the outdoor heat exchanger is kept constant.
Since the combustion amount of the combustion unit and the rotation speed of the refrigerant pump are controlled, the efficiency of the atmospheric heat absorption combustion heating operation is improved.

The second on-off valve 32 of the fourth embodiment
Alternatively, a check valve may be used so as to flow from the fourth connection port 27 of the four-way valve 17 toward the suction port 7 of the ejector 8 to obtain the same effect.

Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a system diagram of the fifth embodiment of the present invention.

In FIG. 7, what is different from FIG. 11 of the conventional example is that a third opening / closing valve 34 is provided in parallel with the ejector 8 in the middle of the fifth connecting pipe 19, and further the first, second and third parts are provided. Opening / closing operations of the open / close valves 30, 32, 34 and the four-way valve 17
The point is that a controller 37 is provided for controlling the switching operation.

The operation of the above configuration will be described. First,
When performing the cooling operation, as in the first embodiment of the present invention shown in FIG. 1, the first and second connection ports 18 and 2 of the four-way valve 17 are provided.
The four-way valve 17 is switched so that the 0 and the third and fourth connection ports 25 and 27 are communicated with each other, and the first opening / closing valve 30 and the second opening / closing valve 32 are opened, and the third opening / closing valve is opened. 34 is closed. In the case where the heat source of the heater 3 is the cooling water or the exhaust gas of the automobile engine in the case of FIG. 10, there is a difference in the case of the general combustion section 16 in the case of FIG. Since it is similar to the case of FIG. 11 and FIG.

Next, in the heating operation, the controller 37
Switches the four-way valve 17 so that the first and third connection ports 18 and 25 and the second and fourth connection ports 20 and 27 of the four-way valve 17 respectively communicate with each other, and further, the first and second opening / closing valves. The valves 30 and 32 are closed, and the third opening / closing valve 34 is opened. The combustion gas generated in the combustion section 16 and the liquid refrigerant sent from the refrigerant pump 2 exchange heat in the heater 3,
This liquid refrigerant evaporates and becomes vapor, and the third on-off valve 34
Then, it is condensed and liquefied in the indoor heat exchanger 23 through the four-way valve 17. When this vapor refrigerant is condensed in the indoor heat exchanger 23,
Dissipates heat to the surroundings and produces a heating effect. The condensed liquid refrigerant is sucked into the refrigerant pump 2 through the branch point 12.

Next, the case of starting the heating operation will be described. When the heating operation is stopped, the refrigerant may gradually leak from the four-way valve 17 and the first opening / closing valve 30 into the refrigerant circuit of the outdoor heat exchanger 21 or the like that is not used during the heating operation. Therefore, when the heating operation is stopped for a relatively long time, the refrigerant in the heating circuit decreases. Therefore, the refrigerant recovery operation is performed when the heating operation is started. The controller 37 closes the first and third opening / closing valves 30 and 34, opens the second opening / closing valve 32, and further opens the first and third connection ports 18 and 25 of the four-way valve 17 and the third opening / closing valve 32. Second and fourth connection ports 20, 27
The four-way valve 17 is switched so as to communicate with each other. The combustion gas generated in the combustion section 16 and the liquid refrigerant sent from the refrigerant pump 2 exchange heat in the heater 3, and the liquid refrigerant evaporates into high-pressure vapor and enters the ejector 8. This high-pressure vapor refrigerant is ejected at a high speed from the nozzle 8a of the ejector 8, so that the pressure in the mixing chamber 8b of the ejector 8 decreases and becomes a negative pressure. As a result, since the outdoor heat exchanger 21 also has a negative pressure through the ninth connecting pipe 28 and the sixth connecting pipe 22 connected to the suction port 7, the outdoor heat exchanger 21, which is not used during normal heating operation, The refrigerant leaking into the refrigerant circuits such as the sixth connecting pipe 22 and the seventh connecting pipe 24 is sucked into the ejector 8 from the suction port 7. The high-temperature and high-pressure steam sent from the fifth connection pipe 19 and the low-temperature and low-pressure steam sent from the ninth connection pipe 28 are mixed by the ejector 8, and further enter the indoor heat exchanger 23 to be condensed. Liquefy. When condensed and liquefied, the heat of condensation is radiated into the room for heating. Then, this liquid refrigerant is sucked into the refrigerant pump 2 through the tenth connecting pipe 29.

According to the fifth embodiment of the present invention, when the heating operation is started, the high-temperature and high-pressure vapor refrigerant discharged from the heater is sent to the ejector, and the low-pressure refrigerant of the outdoor heat exchanger is sucked from the suction port of the ejector. Since the refrigerant recovery operation for recovering in the heating refrigerant circuit is performed, the required refrigerant amount can be always secured in the heating refrigerant circuit, stable heating operation can be performed, and comfort can be improved. Further, even during the refrigerant recovery operation, the indoor heat exchanger heats with the normal heating capacity, so comfort is not impaired.

The second on-off valve 32 of the fifth embodiment
Alternatively, a check valve may be used so as to flow from the fourth connection port 27 of the four-way valve 17 toward the suction port 7 of the ejector 8 to obtain the same effect.

Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 8 is a system diagram of the sixth embodiment of the present invention.

In FIG. 8, the difference from the fifth embodiment shown in FIG. 7 is that the controller 37 uses the output signal of the heater temperature detecting means 33 for detecting the refrigerant temperature of the heater 3 to cause the second on-off valve 32 to change. And controlling the second opening / closing valve 34.

The operation of the above configuration will be described. There are three types of operation: cooling operation, heating operation, and refrigerant recovery operation during heating operation. Of these, the operation effects of the cooling operation and the heating operation are the same as in the fifth embodiment of FIG. Therefore, the refrigerant recovery operation during the heating operation will be described. The pressure of the heating refrigerant circuit in which the refrigerant flows during the heating operation is high, and the pressure of the cooling-only refrigerant circuit in which the refrigerant does not flow during the heating operation is low. Therefore, during the heating operation, the refrigerant may gradually leak through the four-way valve 17 and the first opening / closing valve 30 into the cooling-only refrigerant circuit such as the outdoor heat exchanger 21 that is not used during the heating operation. Therefore, when the heating operation is continued for a long time, the refrigerant in the heating circuit decreases. Therefore, the refrigerant recovery operation is performed during the heating operation.

In FIG. 9, the horizontal axis represents the amount of refrigerant leakage to the cooling-only refrigerant circuit, and the vertical axis represents the heater refrigerant temperature. When the amount of refrigerant leaks into the cooling-only refrigerant circuit during heating operation, the heater is heated. 3 shows the change in the refrigerant temperature of the above. As is clear from the figure, the refrigerant temperature rise of the heater is small while the leakage amount is small, but the refrigerant temperature of the heater rapidly rises when the leakage amount exceeds a certain amount. An upper limit temperature T is a temperature that is sufficiently lower than the temperature at which the refrigerant thermally decomposes and higher than the heater refrigerant temperature during normal heating operation. Therefore, when the refrigerant temperature of the heater reaches the upper limit temperature T, the heating operation is switched to the refrigerant recovery operation, and the refrigerant leaked to the cooling-only refrigerant circuit is recovered in the heating refrigerant circuit.

The controller 37 closes the third opening / closing valve 34 and opens the second opening / closing valve 32. The combustion gas generated in the combustion section 16 and the liquid refrigerant sent from the refrigerant pump 2 exchange heat in the heater 3, and the liquid refrigerant evaporates into high-pressure vapor and enters the ejector 8. This high-pressure vapor refrigerant is ejected at a high speed from the nozzle 8a of the ejector 8, so that the pressure in the mixing chamber 8b of the ejector 8 decreases and becomes a negative pressure. As a result, the ninth connecting pipe 2 connected to the suction port 7
Since the outdoor heat exchanger 21 also has a negative pressure through 8 and the sixth connecting pipe 22, the refrigerant of the outdoor heat exchanger 21, the sixth connecting pipe 22, the seventh connecting pipe 24, and the like not used during the normal heating operation. The refrigerant that has leaked into the circuit is sucked into the ejector 8 from the suction port 7. The high-temperature and high-pressure steam sent from the fifth connection pipe 19 and the low-temperature and low-pressure steam sent from the ninth connection pipe 28 are mixed by the ejector 8, and further enter the indoor heat exchanger 23 to be condensed. Liquefy. When condensed and liquefied, the heat of condensation is radiated into the room for heating. And
This liquid refrigerant is sucked into the refrigerant pump 2 through the tenth connecting pipe 29.

According to the sixth embodiment of the present invention, when the refrigerant in the heating refrigerant circuit leaks to the cooling-only refrigerant circuit during the heating operation, the high-temperature and high-pressure vapor refrigerant discharged from the heater is sent to the ejector, Since the refrigerant recovery operation is performed in which the low-pressure refrigerant of the outdoor heat exchanger is sucked from the intake port of the ejector and is recovered in the heating refrigerant circuit, it is possible to always secure the required amount of refrigerant in the heating refrigerant circuit, which is stable. Heating operation is possible and comfort can be improved. Further, even during the refrigerant recovery operation, the indoor heat exchanger heats with the normal heating capacity, so comfort is not impaired.

The second on-off valve 32 of the sixth embodiment
Alternatively, a check valve may be used so as to flow from the fourth connection port 27 of the four-way valve 17 toward the suction port 7 of the ejector 8 to obtain the same effect.

[0069]

As described above, according to the cooling and heating device of the present invention, the following effects can be obtained.

A third on-off valve is provided in parallel with the ejector in the middle of the fifth connecting pipe, and a second throttle device and a second check valve are provided in parallel in the middle of the seventh connecting pipe. For heating operation when the load is large, such as starting operation at low outside temperature, switch the four-way valve so that the first and third connection ports and the second and fourth connection ports of the four-way valve are connected to each other. Moreover, since the first and second on-off valves are opened and the third on-off valve is closed, heat from the outdoor atmosphere can be used for heating in addition to the combustion heat of the combustion section. , A large heating capacity is obtained, the room temperature starts up faster,
This has the effect of improving the efficiency of heating.

In the normal heating operation, the four-way valve is switched so that the first and third connection ports and the second and fourth connection ports of the four-way valve are connected to each other, and the first and third connection ports are further connected. Since the second on-off valve is in the closed state and the third on-off valve is in the open state, since the vapor refrigerant flowing out of the heater flows by bypassing the ejector, the refrigerant temperature decreases as much as the flow path resistance decreases, The heat radiation loss can be reduced, and the heating operation efficiency can be improved.

Since the atmospheric heat absorption combustion heating operation and the normal combustion heating operation are switched to the more efficient one according to the outside air temperature based on the output signal from the outside air temperature detecting means, the efficiency of the heating operation is improved. Have.

Based on the two output signals from the outside air temperature detecting means and the refrigerant temperature detecting means provided in the heater, if the difference between the outside air temperature and the refrigerant temperature of the outdoor heat exchanger is small, then atmospheric heat absorption combustion Since the heating operation is switched to the normal combustion heating operation for more efficient heating, there is an effect that the efficiency of the heating operation is improved.

Based on the two output signals from the outside air temperature detecting means and the refrigerant temperature detecting means provided in the heater, the difference between the outside air temperature and the refrigerant temperature of the outdoor heat exchanger is kept constant.
Since the combustion amount of the combustion section and the rotation speed of the refrigerant pump are controlled, there is an effect that the efficiency of the atmospheric heat absorption combustion heating operation is improved.

Further, a third opening / closing valve is provided in parallel with the ejector in the middle of the fifth connecting pipe, and a controller for controlling opening / closing operations of the first, second and third opening / closing valves is provided for heating. When the operation is started, the controller 37 closes the first and third on-off valves, opens the second on-off valve, and further opens the first and third connection ports and the fourth connection port of the four-way valve. Since the four-way valve is switched so that the second and fourth connection ports communicate with each other,
To perform high-temperature high-pressure vapor refrigerant discharged from the heater to the ejector at the start of the heating operation, and to suck the low-pressure refrigerant of the outdoor heat exchanger from the ejector inlet to recover the refrigerant in the heating refrigerant circuit. In addition, the required amount of refrigerant can be always secured in the heating refrigerant circuit, stable heating operation can be performed, and comfort can be improved.

Further, it is judged from the output signal from the heater temperature detecting means that the refrigerant in the heating refrigerant circuit has leaked to the cooling-only refrigerant circuit during the heating operation, and at this time, the high-temperature high-pressure steam discharged from the heater is judged. Refrigerant is sent to the ejector, and a low-pressure refrigerant of the outdoor heat exchanger is sucked from the intake port of the ejector and is recovered in the heating refrigerant circuit.Therefore, the required refrigerant amount is always secured in the heating refrigerant circuit. Therefore, stable heating operation can be performed, and comfort can be improved. Further, even during the refrigerant recovery operation, since the indoor heat exchanger heats with the normal heating capacity, there is an effect that comfort is not impaired.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of an air conditioner according to Embodiment 1 of the present invention.

FIG. 2 is a system configuration diagram of an air conditioner according to Embodiment 2 of the present invention.

FIG. 3 is an explanatory diagram showing a change in heating efficiency with respect to an outside air temperature according to the second embodiment.

FIG. 4 is a system configuration diagram of an air conditioner according to a third embodiment of the present invention.

FIG. 5 is a system configuration diagram of an air conditioner according to Embodiment 4 of the present invention.

FIG. 6 is an explanatory diagram showing changes in the evaporation temperature of the outdoor heat exchanger with respect to the combustion amount during the atmospheric heat absorption combustion heating operation according to the fourth embodiment.

FIG. 7 is a system configuration diagram of an air conditioner according to Embodiment 5 of the present invention.

FIG. 8 is a system configuration diagram of an air conditioner according to Embodiment 6 of the present invention.

FIG. 9 is an explanatory diagram showing changes in the refrigerant temperature of the heater when the refrigerant leaks into the cooling-only refrigerant circuit according to the sixth embodiment.

FIG. 10 is a system configuration diagram of a cooling device in a conventional example.

FIG. 11 is a system configuration diagram of a cooling and heating device that can be considered as a cooling device in a conventional example.

[Explanation of symbols]

 2 Refrigerant pump 3 Heater 7 Suction port 8 Ejector 15 First expansion device 16 Combustion part 17 Four-way valve 19 Fifth connecting pipe 21 Outdoor heat exchanger 22 Sixth connecting pipe 23 Indoor heat exchanger 24 Seventh connecting Pipe 26 Eighth connecting pipe 28 Ninth connecting pipe 29 Tenth connecting pipe 30 First opening / closing valve 31 First check valve 32 Second opening / closing valve 34 Third opening / closing valve 35 First throttling device 36 Second check valve

Claims (6)

[Claims] 1. A heater for exchanging heat with combustion gas generated in a combustion section, a four-way valve for switching a refrigerant circuit during a cooling operation and a heating operation, one end of an outlet of the heater, and a first end of the four-way valve. A fifth connecting pipe having the other ends connected to the connecting ports respectively, and a jet provided toward the first connecting port of the four-way valve, which is provided in the middle of the fifth connecting pipe and is sent from the heater, side An ejector for sucking low-pressure vapor refrigerant from a suction port provided on one side and one end is connected to the second connection port of the four-way valve, and the other end is connected to an outdoor heat exchanger that condenses and liquefies the vapor refrigerant during cooling. A sixth connecting pipe, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which functions as an evaporator during cooling and a condenser during heating, and which includes a first opening / closing valve. One end is connected to the seven connection pipe and the indoor heat exchanger, and the other end is the third connection port of the four-way valve. A connected eighth connecting pipe, and a ninth connecting pipe having one end connected to the fourth connecting port of the four-way valve and the other end connected to the suction port of the ejector and having a second opening / closing valve, A tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe and connected to the inlet of the heater and equipped with a refrigerant pump, and a tenth connecting pipe provided in parallel with the ejector in the middle of the fifth connecting pipe. A cooling and heating device comprising three on-off valves, a second expansion device and a second check valve connected in parallel in the middle of the seventh connecting pipe. 2. A heater for exchanging heat with combustion gas generated in a combustion section, a four-way valve for switching a refrigerant circuit during cooling operation and heating operation, one end of the outlet of the heater, and a first end of the four-way valve. A fifth connecting pipe having the other ends connected to the connecting ports respectively, and a jet provided toward the first connecting port of the four-way valve, which is provided in the middle of the fifth connecting pipe and is sent from the heater, side An ejector for sucking low-pressure vapor refrigerant from a suction port provided on one side and one end is connected to the second connection port of the four-way valve, and the other end is connected to an outdoor heat exchanger that condenses and liquefies the vapor refrigerant during cooling. A sixth connecting pipe, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which functions as an evaporator during cooling and a condenser during heating, and which includes a first opening / closing valve. One end is connected to the seven connection pipe and the indoor heat exchanger, and the other end is the third connection port of the four-way valve. A connected eighth connecting pipe, and a ninth connecting pipe having one end connected to the fourth connecting port of the four-way valve and the other end connected to the suction port of the ejector and having a second opening / closing valve, A tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe and connected to the inlet of the heater and equipped with a refrigerant pump, and a tenth connecting pipe provided in parallel with the ejector in the middle of the fifth connecting pipe. Three open / close valves, a second throttle device connected in parallel in the middle of the seventh connecting pipe, a second check valve, an outside air temperature detecting means, and the outside air above a certain preset temperature. When the outside air temperature obtained from the temperature detecting means is higher, the atmospheric heat absorption combustion heating operation is performed, and when the outside air temperature is low, the opening / closing operation of the first, second and third opening / closing valves is controlled. An air conditioner consisting of a controller to perform. 3. A heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit during cooling operation and heating operation, and one end of the outlet of the heater for the first of the four-way valve. A fifth connecting pipe having the other ends connected to the connecting ports respectively, and a jet provided toward the first connecting port of the four-way valve, which is provided in the middle of the fifth connecting pipe and is sent from the heater, side An ejector for sucking low-pressure vapor refrigerant from a suction port provided on one side and one end is connected to the second connection port of the four-way valve, and the other end is connected to an outdoor heat exchanger that condenses and liquefies the vapor refrigerant during cooling. A sixth connecting pipe, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which functions as an evaporator during cooling and a condenser during heating, and which includes a first opening / closing valve. One end is connected to the seven connection pipe and the indoor heat exchanger, and the other end is the third connection port of the four-way valve. A connected eighth connecting pipe, and a ninth connecting pipe having one end connected to the fourth connecting port of the four-way valve and the other end connected to the suction port of the ejector and having a second opening / closing valve, A tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe and connected to the inlet of the heater and equipped with a refrigerant pump, and a tenth connecting pipe provided in parallel with the ejector in the middle of the fifth connecting pipe. Three open / close valves, a second throttle device connected in parallel in the middle of the seventh connecting pipe, a second check valve, an outside air temperature detecting means, and the outside air above a certain preset temperature. When the outside air temperature obtained from the temperature detecting means is higher, the atmospheric heat absorption combustion heating operation is performed, and when the outside air temperature is low, the opening / closing operation of the first, second and third opening / closing valves is controlled. An air conditioner consisting of a controller to perform. 4. A heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching a refrigerant circuit during cooling operation and heating operation, and one end of the outlet of the heater, the first of the four-way valve. A fifth connecting pipe having the other ends connected to the connecting ports respectively, and a jet provided toward the first connecting port of the four-way valve, which is provided in the middle of the fifth connecting pipe and is sent from the heater, side An ejector for sucking low-pressure vapor refrigerant from a suction port provided on one side and one end is connected to the second connection port of the four-way valve, and the other end is connected to an outdoor heat exchanger that condenses and liquefies the vapor refrigerant during cooling. A sixth connecting pipe, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which functions as an evaporator during cooling and a condenser during heating, and which includes a first opening / closing valve. One end is connected to the seven connection pipe and the indoor heat exchanger, and the other end is the third connection port of the four-way valve. A connected eighth connecting pipe, and a ninth connecting pipe having one end connected to the fourth connecting port of the four-way valve and the other end connected to the suction port of the ejector and having a second opening / closing valve, A tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe and connected to the inlet of the heater and equipped with a refrigerant pump, and a tenth connecting pipe provided in parallel with the ejector in the middle of the fifth connecting pipe. Three open / close valves, a second expansion device connected in parallel in the middle of the seventh connecting pipe, a second check valve, an outside air temperature detecting means, and a heat transfer pipe surface of the outdoor heat exchanger. And a refrigerant temperature detecting means for burning so that the difference between the outside air temperature obtained by the outside air temperature detecting means and the refrigerant temperature obtained by the refrigerant temperature detecting means during the atmospheric heat absorption combustion heating operation becomes a predetermined temperature difference. Cooling and heating device including a controller for controlling the cooling section and the refrigerant pump. 5. A heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit during cooling operation and heating operation, one end of the outlet of the heater, and a first end of the four-way valve. A fifth connecting pipe having the other ends connected to the connecting ports respectively, and a jet provided toward the first connecting port of the four-way valve, which is provided in the middle of the fifth connecting pipe and is sent from the heater, side An ejector for sucking low-pressure vapor refrigerant from a suction port provided on one side and one end is connected to the second connection port of the four-way valve, and the other end is connected to an outdoor heat exchanger that condenses and liquefies the vapor refrigerant during cooling. A sixth connecting pipe, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which functions as an evaporator during cooling and a condenser during heating, and which includes a first opening / closing valve. One end is connected to the seven connection pipe and the indoor heat exchanger, and the other end is the third connection port of the four-way valve. A connected eighth connecting pipe, and a ninth connecting pipe having one end connected to the fourth connecting port of the four-way valve and the other end connected to the suction port of the ejector and having a second opening / closing valve, A tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe and connected to the inlet of the heater and equipped with a refrigerant pump, and a tenth connecting pipe provided in parallel with the ejector in the middle of the fifth connecting pipe. An air conditioner comprising a third opening / closing valve and a controller for controlling opening / closing of the first, second and third opening / closing valves and switching of the four-way valve. 6. A heater for exchanging heat with the combustion gas generated in the combustion section, a four-way valve for switching the refrigerant circuit during cooling operation and heating operation, one end of the outlet of the heater, and a first end of the four-way valve. A fifth connecting pipe having the other ends connected to the connecting ports respectively, and a jet provided toward the first connecting port of the four-way valve, which is provided in the middle of the fifth connecting pipe and is sent from the heater, side An ejector for sucking low-pressure vapor refrigerant from a suction port provided on one side and one end is connected to the second connection port of the four-way valve, and the other end is connected to an outdoor heat exchanger that condenses and liquefies the vapor refrigerant during cooling. A sixth connecting pipe, and one end of which is connected to the outdoor heat exchanger, and the other end of which is connected to an indoor heat exchanger which functions as an evaporator during cooling and a condenser during heating, and which includes a first opening / closing valve. One end is connected to the seven connection pipe and the indoor heat exchanger, and the other end is the third connection port of the four-way valve. A connected eighth connecting pipe, and a ninth connecting pipe having one end connected to the fourth connecting port of the four-way valve and the other end connected to the suction port of the ejector and having a second opening / closing valve, A tenth connecting pipe branched from a branch point in the middle of the seventh connecting pipe and connected to the inlet of the heater and equipped with a refrigerant pump, and a tenth connecting pipe provided in parallel with the ejector in the middle of the fifth connecting pipe. Three on-off valves, heater temperature detecting means provided on the surface of the heat transfer tube of the heater, refrigerant temperature obtained from the heater temperature detecting means during combustion heating operation, and there is set a predetermined refrigerant temperature And a controller that controls switching from the combustion heating operation to the refrigerant recovery operation at a higher temperature.