JPH1071848A - Brine type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cooling responsiveness in starting in a brine type air conditioner to perform the cooling in a cabin by circulating brine in an incabin cooler. SOLUTION: A brine type air conditioner is provided with a refrigeration cycle 2 to cool the brine using the flammable gas as the refrigerant, a brine circuit 10 in which the cooled brine is circulated, a hot water circuit 22 in which he hot water heated by an engine 9 is circulated, a front air conditioning unit 13 to perform the air-conditioning of a front part in a cabin, and a rear air conditioning unit 14 to perform the air-conditioning of a rear part in the cabin. The front air conditioning unit is provided with a cooler 15 to cool the conditioned air by the brine, a heater 17 to heat the conditioned air with hot water, and a fan 16, and the rear air conditioning unit is provided with a air-conditioning heat exchanger 18 commonly used for cooling and heating which is capable of cooling the conditioned air with the brine and heating the conditioned air with the hot water, and a fan 19. In addition, a heat storage tank 21 to store the low temperature brine is provided, and when the cooling is started, the low temperature brine in the heat storage tank 21 is circulated through the cooler 15 and the air-conditioning heat exchanger 18 to cool the conditioned air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brine type air conditioner for circulating brine cooled by a brine-refrigerant heat exchanger provided in a refrigeration cycle to a cooler in a room to cool the room. is there.

[0002]

2. Description of the Related Art In recent years, in order to prevent global warming, an air conditioner for a vehicle has been proposed in which a refrigerant in a refrigeration cycle is changed from chlorofluorocarbon to a flammable gas such as propane gas to cool a room. For example, see Japanese Utility Model Laid-Open No. 58-54904). In the above-described vehicle air conditioner, a cooler (evaporator) that cools the conditioned air by the latent heat of vaporization of the flammable gas is installed in the vehicle interior. There is a danger of leaking into the interior of the vehicle.

Therefore, in order to avoid gas leakage into the vehicle interior, the present inventors have installed a brine-refrigerant heat exchanger in an engine room (open space to the atmosphere) outside the vehicle interior. In this case, the brine (water to which the component for lowering the freezing temperature is added) is once cooled by the latent heat of vaporization of the combustible gas, and the low-temperature brine is circulated to a cooler installed in the vehicle interior to cool the room. We are trying to develop an air conditioner for vehicles.

[0004]

However, in a brine type air conditioner which circulates the brine to the indoor cooler and cools the interior of the room, since the heat capacity of the brine is large, the air is directly cooled by the refrigerant. Compared with the method, the temperature drop time of the brine is significantly longer. Therefore, it takes time to lower the temperature in the indoor cooler at the time of starting the cooling or the dehumidifying start, which causes a problem that the cooling responsiveness at the start is poor.

[0005] The present invention has been made in view of the above points,
An object of the present invention is to increase cooling responsiveness at the time of startup in a brine type air conditioner that circulates brine to an indoor cooler and cools a room.

[0006]

In order to achieve the above object, the present invention employs the following technical means. According to the first aspect of the present invention, a flammable gas is used as a refrigerant,
In the refrigerant heat exchanger (7), a refrigeration cycle (2) for cooling the brine by absorbing the latent heat of vaporization of the refrigerant from the brine, and a brine for circulating the brine cooled in the brine-refrigerant heat exchanger (7). A circuit (10) and a hot water circuit (22) in which hot water heated by a hot water source (9) circulates.
And a first air conditioning unit (1
3) and a second air-conditioning unit (14) for air-conditioning a second section of the room. The first air-conditioning unit (13) includes a cooler (15) for cooling the conditioned air by the brine of the brine circuit (10). ), A heater (17) arranged downstream of the cooler (15) in the air and heating the conditioned air with the hot water of the hot water circuit (22), and a blower (16) for blowing the conditioned air. The second air-conditioning unit (14) has a cooling / heating combined air-conditioning heat capable of cooling the conditioned air by the brine of the brine circuit (10) and heating the conditioned air by the hot water of the hot water circuit (22). Exchanger (18) and a blower (1) for blowing the conditioned air.
9), and a heat storage tank (21) for storing the brine of the brine circuit (10) at a low temperature. When the cooling is started, the low-temperature brine in the heat storage tank (21) includes the cooler (15) and the air conditioning heat. It is characterized in that it circulates through the exchanger (18) to cool the conditioned air.

Therefore, according to the first aspect of the present invention, in a brine type air conditioner in which there is no danger of the flammable gas leaking into the room, the low temperature brine in the heat storage tank (21) is used to start the operation. Cooling responsiveness can be increased. According to the second aspect of the present invention, the heat storage tank (21) is used as a shared passage portion (18a) for flowing both the brine of the brine circuit (10) and the hot water of the hot water circuit (22) to the air conditioning heat exchanger (18). And the cold storage and the hot water circuit (2) of the low temperature brine of the brine circuit (10) by the heat storage tank (21).
It is characterized in that both of 2) heat storage of high-temperature hot water is performed.

Therefore, during winter heating, the heat storage tank (2)
By the heat storage of the high-temperature hot water according to 1), it is also possible to increase the responsiveness at the time of starting heating. In addition, since one heat storage tank (21) can be used for both cold storage of low-temperature brine and heat storage of high-temperature hot water, the configuration is simple. Furthermore, in the invention of claim 6, during cooling, the cooler (15) and the heater (17) of the first air conditioning unit (13) and the air conditioning heat exchanger (18) of the second air conditioning unit (14). ) Is characterized by setting a mode in which the brine of the brine circuit (10) flows.

As a result, the three heat exchangers (15, 1
7, 18), the cooling capacity can be improved. Further, in the invention according to claim 7, during heating, the cooler (15) and the heater (17) of the first air conditioning unit (13) and the air conditioning heat exchanger (18) of the second air conditioning unit (14). In each of the modes (1) and (2), a mode in which the hot water in the hot water circuit (22) flows is set.

Thus, the three heat exchangers (15, 1
7, 18), the heating capacity can be improved. In a ninth aspect of the present invention, a flammable gas is used as the refrigerant, and the brine-refrigerant heat exchanger (7) includes:
A refrigeration cycle (2) for cooling the brine by absorbing the latent heat of vaporization of the refrigerant from the brine, a brine circuit (10) for circulating the brine cooled by the brine-refrigerant heat exchanger (7), and a room installed indoors. A cooler (15) for cooling the conditioned air by the brine of the brine circuit (10);
A blower (16) for blowing the conditioned air, and a heat storage tank (21) for storing the brine of the brine circuit (10) at a low temperature are provided.
The low temperature brine in 1) is circulated to the cooler (15) to cool the conditioned air.

[0011] Thus, similarly to the first aspect of the present invention, the low-temperature brine in the heat storage tank (21) is utilized to
The cooling responsiveness at the time of starting can be improved. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) FIGS. 1 and 2 show a first embodiment in which the present invention is applied to an air conditioner for a vehicle. FIG. 1 is a schematic plan layout view of an automobile showing a state in which the air conditioner of the present invention is mounted. is there. The traveling engine 9 is mounted under the floor of the cabin of the automobile, and the engine room 1 is formed. A refrigeration cycle 2 using a combustible gas such as propane gas as a refrigerant is installed in an engine room 1 below the floor.

The refrigeration cycle 2 includes a compressor 3 for compressing and discharging the refrigerant, and the refrigerant discharged from the compressor 3 is cooled by the condenser 4 and condensed. The refrigerant from the condenser 4 is stored in the liquid receiver 5 where gas and liquid of the refrigerant are separated. Next, the liquid refrigerant from the liquid receiver 5 is decompressed by an expansion valve 6 as a decompression means, and is brought into a gas-liquid two-phase state. The refrigerant decompressed by the expansion valve 6 flows into the brine-refrigerant heat exchanger 7, where it absorbs heat and evaporates to cool the brine. The gas refrigerant evaporated in the heat exchanger 7 is sucked into the compressor 3 again and compressed.

The above-mentioned brine is made of antifreeze obtained by adding a component for lowering the freezing temperature, a rust-preventive component and the like to water, and may be the same as the engine cooling water circulating in the hot water circuit 22 described later. Although FIGS. 1 and 2 show the arrangement of the compressor 3 away from the vehicle engine 9, the compressor 3 is actually arranged close to the vehicle engine 9 and the compressor 3 is rotated by the rotation of the vehicle engine 9. It is driven by power via an electromagnetic clutch 8 (FIG. 2).

The brine-refrigerant heat exchanger 7 includes a refrigerant passage portion 7a through which the refrigerant in the refrigeration cycle passes and evaporates, and a brine passage portion 7b disposed so as to exchange heat with the refrigerant passage portion 7a. Have. Next, the brine circuit 10 in which the brine cooled in the brine-refrigerant heat exchanger 7 circulates will be described. The brine circuit 10 includes an electric water pump 11 for circulating brine in the engine room 1. It is installed adjacent to the refrigerant heat exchanger 7.

On the other hand, a front air-conditioning unit (first air-conditioning unit) 13 is installed around the instrument panel in front of the cabin of the automobile, and a rear air-conditioning unit (second air-conditioning unit) 14 is installed behind the cabin. Have been. The front air-conditioning unit 13 has a low-temperature brine (cold water) circulating through the brine circuit 10.
A cooler 15, an air blower 16 and a heater 17 for cooling the air are provided, and the heater 17 is installed downstream of the cooler 15 in the air flow. The heater 17 reheats air using cooling water (warm water) of the engine 9 as a heat source. After the conditioned air passes through the heater 17 and is temperature-adjusted, the conditioned air passes through the front side (the 1 area).

The rear air conditioning unit 14 is provided with an air conditioning heat exchanger 18 for both cooling and heating. The air-conditioning heat exchanger 18 cools air by inflow of low-temperature brine circulating through the brine circuit 10.
Is provided in parallel with the cooler 15. A blower 19 is installed in the rear air-conditioning unit 14, and the blown air exchanges heat with the air-conditioning heat exchanger 18 to be cooled or heated, and then blows out to the rear side of the passenger compartment.

Since the air-conditioning heat exchanger 18 is used for both cooling and heating, the cold / hot water switching valve 20 is connected to the air-conditioning heat exchanger 1.
8, the engine cooling water (hot water) from the hot water circuit 22 and the low-temperature brine from the brine circuit 10 can be switched and introduced into the air-conditioning heat exchanger 18 by the switching valve 20. It is. For this purpose, a common passage 18a for flowing both hot water and brine is provided in the air-conditioning heat exchanger 18, and the hot water circuit 22 on the inlet side of the common passage 18a to the air-conditioning heat exchanger 18 is provided.
A cold / hot water switching valve 20 is disposed at the junction of the cooling water and the brine circuit 10.

The cold / hot water switching valve 20 is driven to be opened and closed by an electric actuator such as a motor. In this embodiment, a valve body (rotor) having a T-shaped flow path 20a as shown in FIG. The configuration is such that the flow path is switched by rotating the 20b. Next, the hot water circuit 22 that circulates engine cooling water will be described. The vehicle engine 9 is a water-cooled type, and also serves as a hot water source. A radiator 24 having a water pump 23 driven directly by the vehicle engine 9 and circulating engine cooling water with the water pump 23, and a bypass circuit 25 provided in parallel with the radiator 24 are provided.

Further, the radiator 24 and the bypass circuit 2
5 is provided with a well-known thermostat (temperature-responsive valve) 26 for switching the flow of the cooling water at the junction of the cooling water from the cooling water 5 and when the temperature of the cooling water becomes equal to or higher than a predetermined temperature (for example, 80 ° C.). 26 opens the circuit to the radiator 24, and the radiator 24 cools the engine cooling water. In the front air conditioning unit 13,
On the cooling water inlet side of the heater 17, an electric open / close valve 28 for intermittently supplying the cooling water to the heater 17 is provided.

A well-known air mix door 29 is provided in the ventilation path of the front air conditioning unit 13 for adjusting the ratio of the amount of warm air passing through the heater 17 and the amount of cool air bypassing the heater 17. I have. This air mix door 29 plays a role as a temperature adjusting means for adjusting the temperature of the air blown into the vehicle interior. FIG. 3 is an electric control block diagram. The air-conditioning electronic control device 30 is based on a switch operation signal from an air-conditioning operation panel 31 and a detection signal from an air-conditioning sensor group 32 etc. Figures 1 and 2
The operation of each electric device shown in (1) is controlled.

Next, the operation of the above configuration will be described.
Now, in summer, when a cooling operation is set based on a switch operation on the air conditioning operation panel 30 and a sensor detection signal, the electromagnetic clutch 8 is turned on, the compressor 1 is driven by the engine 9, and the refrigeration cycle 2 operates. .
Further, the valve body 20b of the cold / hot water switching valve 20 is operated in the brine (cold water) flowing state shown in FIG. 1 (that is, the state in which the inlet side of the common passage portion 18a of the air-conditioning heat exchanger 18 is connected to the brine circuit 10). At the same time, the water pump 11 of the brine circuit 10 is activated.

When the maximum cooling is not being performed, the on-off valve 2
Since the valve 8 is opened, the hot water circulates through the heater 17 of the front air conditioning unit 13. By the operation of the refrigeration cycle 2, the latent heat of evaporation of the refrigerant is absorbed by the brine of the brine circuit 10 in the brine-refrigerant heat exchanger 7, and the brine is cooled. Further, by the operation of the water pump 11, in the brine circuit 10, the brine circulates in the cooler 15 of the front air conditioning unit 13 → the brine-refrigerant heat exchanger 7 → the closed circuit of the water pump 11, and the cold / hot water switching valve 20. →
The brine circulates in the closed circuit of the heat storage tank 21 → the air conditioning heat exchanger 18 of the rear air conditioning unit 14 → the brine-refrigerant heat exchanger 7 → the water pump 11.

Therefore, by operating the blowers 16 and 19, the blown air is cooled by the cooler 15 and the air-conditioning heat exchanger 1.
8, the front and rear sides of the passenger compartment can be cooled. In addition, in the front air conditioning unit 13, as is well known, the ratio of the amount of cool air to the amount of warm air is adjusted by the degree of opening of the air mix door 29, and the amount of reheating by the heater 17 is adjusted. The temperature of the air blown into the room can be adjusted.

Since the brine of the brine circuit 10 is made of water having a low freezing temperature and has a large heat capacity, it takes time to cool the brine at the start of cooling. However, the cooling in the heat storage tank 21 is carried out by the previous cooling operation. Since the cooled brine is stored at a low temperature, the low-temperature brine in the heat storage tank 21 is pushed out to the air-conditioning heat exchanger 18 side of the rear air-conditioning unit 14 by the operation of the water pump 11, so that the air-conditioning heat exchanger 18 , The cooling capacity on the rear side of the passenger compartment can be increased from the start.

The low-temperature brine in the heat storage tank 21 passes through the air conditioning heat exchanger 18 and
Is mixed with the brine flowing out of the cooler 15, and thereafter, is sucked into the water pump 11 through the brine-refrigerant heat exchanger 7. Accordingly, since the water pump 11 discharges the mixed brine, the low-temperature brine in the heat storage tank 21 and the brine outside the heat storage tank 21 circulate in the cooler 15 in a mixed state. Thus, the cooling capacity of the cooler 15 on the front side of the vehicle compartment can be increased from the start.

However, in the case of the cooler 15 of the front air conditioning unit 13, the brine outside the heat storage tank 21 is mixed with the low temperature brine in the heat storage tank 21, as compared with the air conditioning heat exchanger 18 of the rear air conditioning unit 14. Since the circulation is performed in the state, the cooling start-up effect at the time of starting is slightly reduced. Of course, at the time of cooling start, by closing the flow control valve 28 and fully closing the air mix door 29 on the heater 17 side passage, the reheating amount by the heater 17 is reduced to zero (the amount of hot air: zero). , To provide maximum cooling capacity.

The brine outlet side (upper end in FIG. 1) of the air conditioning heat exchanger 18 of the rear air conditioning unit 14 is always connected to the hot water circuit 22.
2 does not flow to the air-conditioning heat exchanger 18 and the air-conditioning heat exchanger 18 is connected to the hot-water circuit 22 by a long hot-water pipe. However, there is no danger that the temperature will rise.

When it is not necessary to cool the rear side of the passenger compartment, the blower 19 of the rear air conditioning unit 14 may be stopped. In this case, heat exchange in the air-conditioning heat exchanger 18 is eliminated, and the air-conditioning heat exchanger 18 becomes a mere brine passage. Next, in the middle season such as the spring and fall, the dehumidification / heating operation is set based on the switch operation on the air conditioning operation panel 30 and the sensor detection signal. During the dehumidifying / heating operation, when the temperature of the air blown into the vehicle compartment is on the relatively low temperature side below a predetermined temperature, the air mixing door 29
The operation of each device is set in the same state as in the above-described cooling except that is slightly opened by a small amount.

When the air mix door 29 is opened, a part of the blown air passes through the heater 17 side passage and is heated to become hot air. Thereby, the cooler 1 of the front air conditioning unit 13
In step 5, the cooled cold air is once again heated to a desired temperature by the heater 17, and the dehumidifying / heating operation can be performed. In addition, since the rear air conditioning unit 14 does not have a heater, the dehumidification / heating operation cannot be performed. Therefore,
In the rear air conditioning unit 14, only the cooling operation by the air conditioning heat exchanger 18 is performed, and the cooling capacity can be adjusted by adjusting the air volume of the blower 19.

During the dehumidifying / heating operation, when the temperature of the air blown into the vehicle compartment is on the relatively high temperature side which is higher than a predetermined temperature, the cold / hot water switching valve 20 controls the rear air conditioning unit 14.
The inlet side of the common passage portion 18 a of the air conditioning heat exchanger 18 is cut off from the brine circuit 10 and connected to the hot water circuit 22. Thereby, the hot water of the hot water circuit 22 flows to both the heater 17 and the air conditioning heat exchanger 18, and the brine of the brine circuit 10 flows only to the cooler 15 of the front air conditioning unit 13. Therefore, at this time, the air conditioning heat exchanger 18 performs a heating operation.

If the operation of the rear air conditioning unit 14 is not required during the dehumidifying / heating operation, the blower 19 may be stopped. By the way, in winter, in order to increase the heating capacity, in the state of the dehumidification and heating operation,
The air flow rate of the warm air may be increased by increasing the opening of the air mix door 29, and the air volumes of the blowers 13, 19 in the front and rear air conditioning units 13, 14 may be increased.

Further, according to the first embodiment, when the maximum heating operation in winter is set, it is possible to improve the heating capacity by flowing hot water also to the cooler 15 as described below. That is, when the maximum heating operation is set, the electromagnetic clutch 8 is turned off, the compressor 3 is stopped, and the refrigeration cycle 2 is stopped. On the other hand, at the same time, the valve body 20b of the cold / hot water switching valve 20 is operated to the position shown in FIG.
8 is disconnected from the brine circuit 10 and connected to the hot water circuit 22, and the cooler 15 is also connected to the hot water circuit 22.

As a result, the hot water in the hot water circuit 22 flows in parallel to the heater 17 and the air-conditioning heat exchanger 18, and at the same time, the hot water also flows to the cooler 15 through the following route. That is, engine 9 → cold / hot water switching valve 20 → cooler 15 → water pump 23
The hot water flows in the path on the suction side of the, and the cooler 15 acts as a heater. As a result, the hot water in the hot water circuit 22 circulates through the cooler 15 and the heater 17 of the front air conditioning unit 13 and the air conditioning heat exchanger 18 of the rear air conditioning unit 14.
The warm air heated by the three heat exchangers 15, 17, and 18 is blown out from the front and rear of the cabin to heat the cabin.

In the first embodiment, the heat storage tank 21 is connected to the air conditioning heat exchanger 1 of the rear air conditioning unit 14.
8 is disposed on the inlet side of the common passage portion 18a, but the heat storage tank 21 is disposed on the outlet side of the common passage portion 18a of the air conditioning heat exchanger 18.
May be arranged. (Second Embodiment) FIG. 4 shows a second embodiment. In the first embodiment, the heat storage tank 21 is connected to the rear air conditioning unit 1.
In the second embodiment, the heat storage tank 21 is disposed on the front air conditioning unit 13 side. Along with this, four cold / hot water switching valves 20, 200,
201 and 202 are used.

The operation of the second embodiment will be described. During summer cooling, when the maximum cooling capacity is exhibited, the refrigeration cycle 2 is operated and the four cold / hot water switching valves 20, 2
Operate 00, 201 and 202 to the positions where the following brine channels are formed. That is, the water pump 11 → the cooler 15 of the front air conditioning unit 13 → the closed circuit of the brine-refrigerant heat exchanger 7 The water pump 11 → the cold / hot water switching valve 20 → the air conditioning heat exchanger 18 of the rear air conditioning unit 14 → the cold / hot water switching Valve 202 → closed circuit of brine-refrigerant heat exchanger 7 water pump 11 → cold / hot water switching valve 200 → heat storage tank 21
→ Opening / closing valve 28 of front air-conditioning unit 13, heater 17 → Cold / hot water switching valve 201 → Closed circuit of brine-refrigerant heat exchanger 7 As described above, brine is supplied to all three heat exchangers (15, 17, 18). It can be used to cool the passenger compartment.

In this case, similarly to the first embodiment, at the time of the previous cooling, the low-temperature brine stored in the heat storage tank 21 is flown to the three heat exchangers (15, 17, 18) to start cooling. The responsiveness of the cooling effect at the time can be enhanced. During normal cooling other than the maximum cooling, 4
The brine flow path and the hot water flow path are switched to the following paths by the two cold / hot water switching valves 20, 200, 201, and 202.

That is, the water pump 11 → the cooler 15 of the front air conditioning unit 13 → the closed circuit of the brine-refrigerant heat exchanger 7 The water pump 11 → the cold / hot water switching valve 20 → the air conditioning heat exchanger 18 of the rear air conditioning unit 14 → Cold / hot water switching valve 202 → brine-closed circuit of refrigerant heat exchanger 7 Engine 9 → cold / hot water switching valve 200 → heat storage tank 21 →
The open / close valve 28 of the front air conditioning unit 13, the heater 17 → the cold / hot water switching valve 201 → the closed circuit of the water pump 23 As described above, low-temperature brine is circulated through the cooler 15 and the air-conditioning heat exchanger 18 to cool the blown air. At the same time, hot water is supplied to the heater 15 of the front air conditioning unit 13, and the temperature of the blown air of the front air conditioning unit 13 can be controlled by reheating by the heater 15.

Next, in the middle season such as spring and autumn,
Dehumidification / heating operation is set based on a switch operation on the air conditioning operation panel 30 and a sensor detection signal. In the dehumidifying / heating operation, when the temperature of the air blown into the vehicle compartment is on the relatively low temperature side below a predetermined temperature, the operation of each device is set to the same state as in the normal cooling described above. During the dehumidifying / heating operation, when the temperature of the air blown into the vehicle compartment is on the relatively high temperature side that is equal to or higher than the predetermined temperature, the rear air conditioning is performed by switching the flow paths of the four cold / hot water switching valves 20, 200, 201, and 202. The air conditioning heat exchanger 18 of the unit 14 is disconnected from the brine circuit 10 and connected to the hot water circuit 22.

That is, water pump 11 → cooler 15 of front air conditioning unit 13 → closed circuit of brine-refrigerant heat exchanger 7 engine 9 → cold / hot water switching valve 20 → rear air conditioning unit 1
4 air-conditioning heat exchanger 18 → cold / hot water switching valve 202 → closed circuit of water pump 23 engine 9 → cold / hot water switching valve 200 → heat storage tank 21 →
A closed circuit of the open / close valve 28 of the front air conditioning unit 13 and the heater 17 → the cold / hot water switching valve 201 → the water pump 23 is formed.

When the hot water flows in parallel with the above closed circuit, the hot water of the hot water circuit 22 flows to both the heater 17 and the air conditioning heat exchanger 18, and the brine of the brine circuit 10 cools the front air conditioning unit 13. It flows only to the vessel 15. Therefore, at this time, the air conditioning heat exchanger 18 performs a heating operation. By the way, in winter, in order to increase the heating capacity, in the above-mentioned dehumidification / heating operation state, the air flow rate of the hot air is increased by increasing the opening degree of the air mix door 29, and the blower 1 in the front and rear air conditioning units 13 and 14 is increased.
What is necessary is just to increase the air volume of 3,19.

Further, when the maximum heating operation is set in winter, it is possible to improve the heating capacity by flowing hot water also through the cooler 15 as described below. That is, when the maximum heating operation is set, the electromagnetic clutch 8 is turned off, the compressor 3 is stopped, and the refrigeration cycle 2 is stopped. Meanwhile, at the same time, the four cold / hot water switching valves 20, 200, 201, 202
The following three hot-water-side closed circuits are configured by the flow path switching.

Engine 9 → Cool and hot water switching valve 20 → Air conditioning heat exchanger 18 of rear air conditioning unit 14 → Cool and hot water switching valve 20
2 → closed circuit of water pump 23 engine 9 → cold / hot water switching valve 200 → heat storage tank 21 →
Opening / closing valve 28 of front air conditioning unit 13, heater 17 → cold / hot water switching valve 201 → closed circuit of water pump 23 Engine 9 → cold / hot water switching valve 20 → front air conditioning unit 1
3 cooler 15 → cooled / hot water switching valve 202 → closed circuit of water pump 23 As a result, hot water flows through all of cooler 15, heater 17 and air conditioning heat exchanger 18, and cooler 15 acts as a heater. Therefore, the warm air heated by the three heat exchangers 15, 17, and 18 can be blown out from the front and rear of the passenger compartment to heat the passenger compartment.

In the second embodiment, the cold / hot water switching valve 202 is omitted, the cold / hot water outlet side of the air-conditioning heat exchanger 18 is directly connected to the suction side of the water pump 9, and the cold / hot The water outlet side may be connected to the suction side of the water pump 9 via the cold / hot water switching valve 201. (Third Embodiment) FIG. 5 shows a third embodiment. In the first embodiment, the heat storage tank 21 is connected to the rear air conditioning unit 1.
4 in the common passage portion 18a of the air conditioning heat exchanger 18, and in the second embodiment, the heat storage tank 21 is connected to the front air conditioning unit 1
In the third embodiment, the heat storage tank 21 is disposed between the front air-conditioning unit 13 and the rear air-conditioning unit 14 in the third embodiment. That is, in this example, the cold / hot water switching valves 203 and 20 are provided on both the inlet side and the outlet side of the heat storage tank 21, and the inlet side of the heat storage tank 21 is connected to the brine circuit 10 and the hot water circuit 22 by the inlet side switching valve 203. Switch to connect. Then, the outlet side of the heat storage tank 21 is switched to and connected to the air conditioning heat exchanger 18 and the heater 17 by the outlet side switching valve 20.

Further, the outlet side of the cooler 15, the heater 17 and the air-conditioning heat exchanger 18 and the water pump 2 of the hot water circuit 22
3 is provided with a cold / hot water switching valve 204 for switching between a suction side and a suction side. Next, the operation of the third embodiment will be described. During summer cooling, the refrigeration cycle 2 is operated and the three cooling / hot water switching valves 20, 203, and 204 are operated to the positions where the following brine flow paths are formed. .

That is, the water pump 11 → the cooler 15 of the front air conditioning unit 13 → the closed circuit of the brine-refrigerant heat exchanger 7 The water pump 11 → the cold / hot water switching valve 203 → the heat storage tank 21
→ Cooling and hot water switching valve 20 → Air conditioning heat exchanger 18 of rear air conditioning unit 14 → Closed circuit of brine-refrigerant heat exchanger 7 With the operation of water pump 11, in brine circuit 10, air conditioning heat exchange with cooler 15 Since the brine circulates through both of the heat exchangers 18, the air blown by the blowers 16 and 19 is cooled by the cooler 15 and the air-conditioning heat exchanger 18, so that the front and rear sides of the passenger compartment can be cooled.

When the maximum cooling is not performed, the on-off valve 2
Since the valve 8 is in the open state, hot water circulates through the heater 17 of the front air conditioning unit 13. Thereby, the temperature of the air blown into the vehicle compartment can be adjusted by adjusting the ratio of the amount of the cool air and the amount of the hot air according to the opening of the air mix door 29. In addition, at the time of starting the cooling, the low-temperature brine in the heat storage tank 21 circulates through the cooler 15 and the air-conditioning heat exchanger 18, so that the cooling capacity can be increased from the start.

At the time of maximum cooling, the opening / closing valve 28 is closed and the air mix door 29 is set to the opening degree of zero (the amount of hot air: zero). Furthermore, at the time of maximum cooling, a mode in which the low-temperature brine is circulated through the heater 17 so that the heater 17 acts as a cooler can also be set. That is, in the maximum cooling mode, the three cold / hot water switching valves 2
0, 203 and 204 constitute a brine flow path as follows.

That is, the water pump 11 → the cooler 15 of the front air conditioning unit 13 → the closed circuit of the brine-refrigerant heat exchanger 7 The water pump 11 → the cold / hot water switching valve 203 → the heat storage tank 21
→ Cool and hot water switching valve 20 → Air-conditioning heat exchanger 18 of rear air conditioning unit 14 → Closed circuit of brine-refrigerant heat exchanger 7 Water pump 11 → Cool and hot water switching valve 203 → Heat storage tank 21
→ Cool and hot water switching valve 20 → Open / close valve 2 of front air conditioning unit 13
8, heater 17 → cold / hot water switching valve 204 → brine-closed circuit of refrigerant heat exchanger 7 As described above, all the brine is passed through the three heat exchangers (15, 17, 18) to cool the passenger compartment. Therefore, the cooling capacity can be improved.

Next, in the middle season such as spring and fall,
Dehumidification / heating operation is set. During the dehumidifying / heating operation, when the temperature of the air blown into the vehicle compartment is relatively low below a predetermined temperature, the operation of each device is set to a state similar to that of the normal cooling except the above-described maximum cooling. Is done. And
During the dehumidifying / heating operation, when the temperature of the air blown into the vehicle compartment is on the relatively high temperature side which is equal to or higher than the predetermined temperature, the air conditioning of the rear air conditioning unit 14 is performed by switching the flow paths of the three cold / hot water switching valves 20, 203, and 204. Heat exchanger 18 is disconnected from brine circuit 10 and coupled to hot water circuit 22.

That is, the water pump 11 → the cooler 15 of the front air conditioning unit 13 → the closed circuit of the brine-refrigerant heat exchanger 7 The engine 9 → the opening / closing valve 28 → the heater 17 of the front air conditioning unit 13 → the cold / hot water switching valve 204 → closed circuit of water pump 23 Engine 9 → cold / hot water switching valve 203 → heat storage tank 21 →
The cold / hot water switching valve 20 → the air conditioning heat exchanger 18 of the rear air conditioning unit 14 → the cold / hot water switching valve 204 → the closed circuit of the water pump 23 By flowing the closed water in parallel with the above closed circuit,
The hot water of the hot water circuit 22 flows to both the heater 17 and the air conditioning heat exchanger 18, and the brine of the brine circuit 10 flows only to the cooler 15 of the front air conditioning unit 13. Therefore, at this time, the air conditioning heat exchanger 18 performs a heating operation.

By the way, in winter, in order to increase the heating capacity, in the above-mentioned dehumidification / heating operation state, the air flow rate of the hot air is increased by increasing the opening degree of the air mixing door 29, and the air conditioning units 13 and 14 before and after. It is only necessary to increase the air volume of the blowers 13 and 19 in. In addition, when the maximum heating operation is set in winter, it is possible to improve the heating capacity by flowing hot water also through the cooler 15 as described below. That is, when the maximum heating operation is set, the electromagnetic clutch 8 is turned off, the compressor 3 is stopped, and the refrigeration cycle 2 is stopped.
To stop. On the other hand, at the same time, the following three hot water side closed circuits are configured by switching the flow paths of the three cold / hot water switching valves 20, 203, and 204.

Engine 9 → cold / hot water switching valve 203 → heat storage tank 21 → cold / hot water switching valve 20 → rear air conditioning unit 14
Air conditioner heat exchanger 18 → cold / hot water switching valve 204 → water pump 2
3 closed circuit Engine 9 → open / close valve 28 → heater 17 of front air conditioning unit 13 → cold / hot water switching valve 204 → closed circuit of water pump 23 Engine 9 → cold / hot water switching valve 203 → cooler of front air conditioning unit 13 15 → cold / hot water switching valve 204 → water pump 23
As a result, warm water flows through all of the cooler 15, the heater 17, and the air-conditioning heat exchanger 18, and the cooler 15 acts as a heater, so that the three heat exchangers 15, 17, 18 The heated hot air can be blown out from the front and rear of the cabin to heat the cabin.

In the first to third embodiments, in the operation mode in which the hot water circulates in the heat storage tank 21 (dehumidification / heating mode or heating mode), the heat storage tank 2
Since high-temperature hot water can be stored in the storage tank 1, the high-temperature hot water in the heat storage tank 21 is used at the next engine start to promote warming-up of the engine 9 and to speed up the start of heating (immediate effect). Heating). (Fourth Embodiment) FIG. 6 shows a fourth embodiment, in which the rear air conditioning unit 14 is abolished and the present invention is applied to a vehicle air conditioner having only a front air conditioning unit 13. In this example, the heat storage tank 21 is provided between the water pump 11 and the cooler 15 of the brine circuit 10. Thereby, the responsiveness at the time of starting the cooling can be improved. (Other Embodiments) In the first to fourth embodiments,
The air mixing door 2 is installed in the ventilation path of the front air conditioning unit 13.
9 is provided, and the air mix method of adjusting the air volume ratio between the cold air and the hot air to adjust the blown air temperature is adopted.
The open / close valve 28 may be configured as a flow control valve for controlling the flow rate of hot water, and a hot water flow rate adjustment method may be used in which the flow rate of the hot air to the heater 17 is adjusted by adjusting the opening of the flow control valve to adjust the temperature of the blown air.

In the first to fourth embodiments, the case where the compressor 3 is driven by the vehicle running engine 9 has been described. However, in the case of an electric vehicle or the like, an electric type in which the compressor 3 is driven by a motor is used. I just need. Also, electric vehicles,
In a hybrid vehicle having both an engine and a motor as a prime mover, the present invention can be similarly implemented by installing an electric water pump as a water pump for circulating hot water to the heater 17 and the like. .

The present invention can be similarly applied to uses other than those for vehicles.

[Brief description of the drawings]

FIG. 1 is a schematic plan layout view of a vehicle showing a first embodiment of the present invention.

FIG. 2A is a circuit diagram of a refrigeration cycle, a hot water circuit, and a brine circuit of the first embodiment, and FIG. 2B is a partial circuit diagram showing another operation position of the cold / hot water switching valve shown in FIG. .

FIG. 3 is an electric control system diagram of the first embodiment.

FIG. 4 is a circuit diagram of a refrigeration cycle, a hot water circuit, and a brine circuit according to a second embodiment.

FIG. 5 is a circuit diagram of a refrigeration cycle, a hot water circuit, and a brine circuit according to a third embodiment.

FIG. 6 is a circuit diagram of a refrigeration cycle, a hot water circuit, and a brine circuit according to a fourth embodiment.

[Explanation of symbols]

1 ... engine room, 2 ... refrigeration cycle, 3 ... compressor,
4 condenser, 6 expansion valve, 7 brine-refrigerant heat exchanger, 9 vehicle engine, 10 brine circuit, 13 front air conditioning unit, 14 rear air conditioning unit, 15 cooler, 16, 19 ... blower, 17 ... heater, 18 ... air-conditioning heat exchanger, 18a ... common passage, 20, 200-204 ...
Cold / hot water switching valve, 21: heat storage tank, 22: hot water circuit.

Claims (9)

[Claims] 1. A closed circuit including a compressor (3), a condenser (4), a pressure reducing means (6), and a brine-refrigerant heat exchanger (7) circulates a flammable gas as a refrigerant. In a brine-refrigerant heat exchanger (7), a refrigeration cycle (2) for absorbing and evaporating the refrigerant decompressed by the pressure reducing means (6) from the brine, and cooling in the brine-refrigerant heat exchanger (7). A brine circuit (10) for circulating the supplied brine, a hot water circuit (22) for circulating hot water heated by a hot water source (9), and a first air conditioning unit (13) for air-conditioning a first section of the room
A second air conditioning unit (14) for air conditioning a second section of the room, wherein the first air conditioning unit (13) includes a cooler (15) for cooling conditioned air by brine of the brine circuit (10). ), A heater (17) which is arranged downstream of the cooler (15) in the air and heats the conditioned air with the hot water of the hot water circuit (22), and a blower (16) for blowing the conditioned air. The second air conditioning unit (14) includes a cooling / heating unit that cools the conditioned air with the brine of the brine circuit (10) and that can heat the conditioned air with the hot water of the hot water circuit (22). Dual-use air conditioning heat exchanger (1
8) and a blower (19) for blowing the conditioned air, and a heat storage tank (21) for storing the brine of the brine circuit (10) at a low temperature. When the cooling is started, the heat storage tank (21) is provided. The low temperature brine in the above) is the cooler (15) and the heat exchanger (18).
A brine type air conditioner, which circulates air to cool conditioned air. 2. The heat storage tank (21) has a shared passage (18a) for flowing both the brine of the brine circuit (10) and the hot water of the hot water circuit (22) to the air conditioning heat exchanger (18). 2) wherein the heat storage tank (21) performs both cold storage of low-temperature brine of the brine circuit (10) and heat storage of high-temperature hot water of the hot water circuit (22). The described brine type air conditioner. 3. The heat storage tank (21) is disposed on the inlet side of the common passage portion (18a) of the air conditioning heat exchanger (18), and the heat storage tank (21) is provided on the inlet side of the heat storage tank (21). 3. A brine type as claimed in claim 2, wherein a switching valve (20) for switching the medium flowing into the brine circuit (10) between the brine of the brine circuit (10) and the hot water of the hot water circuit (22) is provided. Air conditioner. 4. The heat storage tank (21) is provided on the medium inlet side of the heater (17), and when cooling, the brine of the brine circuit (10) is passed through the heat storage tank (21) and the heater ( A mode in which the brine of the brine circuit (10) circulates to the cooler (15) and the air conditioning heat exchanger (18) while being circulated to the cooler (15).
A brine type air conditioner according to claim 1. 5. The medium storage valve means (20) is provided on both the medium inlet and outlet sides of the heat storage tank (21).
3, 20), and the inlet side of the heat storage tank (21) is switched and connected to the brine circuit (10) and the hot water circuit (22) by the valve means (203) on the inlet side; The heat storage tank (2)
2. The brine type air conditioner according to claim 1, wherein the outlet side of 1) is switched and connected to the air conditioning heat exchanger (18) and the heater (17). 3. 6. The first air conditioning unit (1) during cooling.
Setting a mode in which the brine of the brine circuit (10) flows through all of the cooler (15) and the heater (17) of 3) and the air conditioning heat exchanger (18) of the second air conditioning unit (14). The brine type air conditioner according to any one of claims 1, 2, 3, and 5, wherein: 7. During heating, the first air conditioning unit (1)
The mode in which the hot water of the hot water circuit (22) flows is set to all of the cooler (15) and the heater (17) of 3) and the air conditioning heat exchanger (18) of the second air conditioning unit (14). 7. The method according to claim 1, wherein:
The brine type air conditioner according to any one of the above. 8. A brine type air conditioner according to claim 1, wherein the air conditioner is mounted on a vehicle, and the first air conditioner unit (13) is arranged at a front portion in a vehicle interior, and is provided with a vehicle. The second air-conditioning unit (14) is arranged at the rear of the vehicle compartment to air-condition the rear of the vehicle compartment, and the hot water source is provided at the rear of the vehicle. A brine type air conditioner, which is an engine (9). 9. A closed circuit including a compressor (3), a condenser (4), a pressure reducing means (6), and a brine-refrigerant heat exchanger (7), circulating a combustible gas as a refrigerant, In a brine-refrigerant heat exchanger (7), a refrigeration cycle (2) for absorbing and evaporating the refrigerant decompressed by the pressure reducing means (6) from the brine, and cooling in the brine-refrigerant heat exchanger (7). A brine circuit (10) through which the circulated brine is circulated; a cooler (15) installed indoors and cooling the conditioned air by the brine of the brine circuit (10); and a blower (16) for blowing the conditioned air. A heat storage tank (21) for storing the brine of the brine circuit (10) at a low temperature, and at the time of cooling start, the low temperature brine in the heat storage tank (21) circulates through the cooler (15) to conditioned air. Brine type air conditioner which is characterized in that cooled.