JPH1058961A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently secure a heat source of a heating means of two air conditioners, by forming a part of a cooling cycle with the first cooling means, a heating means using the engine cooling water as a heat source, and a heating quantity adjusting means, and comprising the second blower, cooler and condenser, and the heating quantity adjusting means in an air conditioning duct. SOLUTION: A mix door 16 is installed in the downstream of an evaporator 14, for opening and closing a passage to a heat core 18, and a passage for by-passing the heat core 18. Thereby the coolant compressed by a compresser 30, is sent to an internal condenser 19 through the by-pass passage 52 by-passing an external heat exchanger 33, for radiating the heat to the air passing therethrough, thereby the air is condensed, the gas and liquid are separated, and expanded respectively through the electromagnetic valves 35, 36, the heat is absorbed by the evaporators 14, 15 to be evaporated, and the air is regressed. The heat absorbed by the first and second evaporators 14, 15, is radiated by one internal condenser 19, so that the heating capacity can be sufficiently ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for a one-box car having a first air conditioner and a second air conditioner. The present invention relates to a vehicle air conditioner mounted on a vehicle that cannot sufficiently heat the vehicle.

[0002]

2. Description of the Related Art As a conventional vehicle air conditioner, for example, disclosed in Japanese Patent Application Laid-Open No. 5-85141, an evaporator for cooling air passing through a cooling cycle and an engine cooling water as a heat source are provided in an air conditioning duct. The heater core is disposed, the air sent by the blower is cooled by the evaporator, and the cooled air is divided by the mixing door into the air passing through the heater core and the air bypassing, and the downstream side of the heater core These airs are mixed to obtain air adjusted to a desired temperature.

[0003] Japanese Patent Application Laid-Open No. Hei 5-319077 discloses an air conditioner in which an evaporator (evaporator) and a condenser (condenser) are arranged in an air-conditioning duct. The cooling, heating, dehumidifying and heating, and defrosting operations are performed by appropriately switching the flow of the refrigerant between the four-way valves.

Further, the air conditioner disclosed in Japanese Patent Laid-Open No. 6-341732 is capable of switching between operation modes without using a four-way valve, and is arranged in a compressor and an air conditioning duct. A first heat exchanger, a first expansion valve, a third heat exchanger outside the air conditioning duct, an on-off valve or a check valve, a second expansion valve, the second expansion valve, the ventilation amount of which is adjusted by a damper. A second heat exchanger disposed upstream of the first heat exchanger, forming a closed loop in the order of the first heat exchanger, a passage connecting the inflow side and the outflow side of the first expansion valve, and a first heat exchanger; A passage communicating the outlet side of the exchanger with the inlet side of the second expansion valve, a passage communicating the outlet side of the third heat exchanger with the suction side of the compressor, and an on-off valve for opening and closing these passages Having.

[0005]

However, it is intended to improve the combustion efficiency of the engine in order to meet the emission regulations, and as a result, the combustion efficiency of the engine has been improved. Japanese Patent Application Laid-Open No. H05-8-8 discloses an air conditioner for a rear seat.
When two air conditioners as disclosed in Japanese Patent No. 5141 are used, the engine cooling water does not become a sufficient heating heat source. As a result, the heating heat is reduced by as much as 30% particularly in a diesel vehicle.

For this reason, if a PTC electric heater is used as an alternative heat source to obtain the same effect, a large current (3
0A or more), which is not preferable in terms of safety as a vehicle electrical component.

When an air conditioner as disclosed in JP-A-5-319077 and JP-A-6-341732 is used for a front seat and a rear seat, two condensing units are operated in the same cooling cycle. It is impossible to use the heat source as a heat source, and a dedicated cooling cycle for the first and rear seats must be provided in order to secure the heat source. Occurs.

Therefore, an object of the present invention is to provide a vehicle air conditioner which can sufficiently secure a heat source of heating means of two air conditioners.

[0009]

Therefore, a vehicle air conditioner according to the present invention has at least a first air blowing means in an air conditioning duct having an inlet at the most upstream side and an outlet at the most downstream side; First cooling means constituting a part of a cooling cycle, first heating means using engine cooling water as a heat source, and first heating amount adjusting means for adjusting an amount of air passing through the first heating means. And a second air blowing means and at least a part of a cooling cycle in an air conditioning duct having a suction port on the most upstream side and an air outlet on the most downstream side. A second air conditioner including a second cooling unit, a second heating unit that is a condenser of a cooling cycle, and a second heating amount adjusting unit that adjusts an amount of air passing through the second heating unit. And a device (claim 1).

In this vehicle air conditioner, the first and second blowing means are blowers arranged upstream of the air conditioning duct, the first heating means is a heater core, and the second heating means is a condenser of a cooling cycle. It is a vessel. Further, the first and second heating amount adjusting means are mix doors arranged upstream of the first and second heating means, and the first and second heating means are controlled by the degree of opening of the mix door. The air passing through the evaporator is diverted into the air passing through and the air bypassing.

Thus, according to the present invention, the first air conditioner includes first heating means using engine cooling water as a heat source, and the second air conditioner is a second condenser which is a condenser for a cooling cycle. By providing the heating means, the heat sources of the first and second air conditioners can be secured.

Further, the cooling cycle (first cooling cycle) includes a compressor, an external heat exchanger connected in series to the compressor, a bypass passage bypassing the external heat exchanger, and the external heat exchange. Switching means for switching between a passage leading to a vessel and the bypass passage; an internal condenser as the second heating means connected in series with the external heat exchanger and the bypass passage; and a switch between the internal condenser and the compressor. And a first cooling flow path in which a first expansion means for expanding a refrigerant passing therethrough and an evaporator as the first cooling means are arranged in series, and connected in parallel to the first cooling flow path. A second expansion means for expanding the refrigerant passing therethrough and a second cooling flow path in which an evaporator as the second cooling means is arranged in series. There (Claim 2).

[0013] The first and second expansion means are motor-operated valves capable of changing the cross-sectional area of the passage at a rate of 0 to 100% (claim 3). It is preferable that a check valve for preventing backflow from the side of the bypass passage be provided on the downstream side before a junction with the bypass passage (claim 4). Furthermore,
Preferably, the switching means is a three-way valve, and a receiver tank is provided downstream of the internal condenser. Further, instead of the electric valve, a valve in which a solenoid valve for opening and closing a flow path and an expansion valve are connected in series may be used.

In the first cooling cycle having the above configuration,
When both the first and second air conditioners are operated in the dehumidifying and heating operation mode, the three-way valve is switched to switch the compressor from the bypass passage, the second heating means, the first and second air conditioners.
The cooling cycle leading to the cooling flow path is constituted, and the first heating means is operated. Thereby, both the first and second air conditioners perform the heating operation.

When the first and second air conditioners are both operated in a cooling operation, the three-way valve is switched to connect the compressor to the external heat exchanger, the second heating means, the first and second cooling passages. , And air is prevented from flowing to the first and second heating means by the first and second heating amount adjusting means. Thereby, both the first and second air conditioners perform the cooling operation.

Further, when the first air conditioner is in the dehumidifying and heating operation mode and the second air conditioner is in the heating mode, the three-way valve is switched and the electric valve of the second cooling passage is closed. From the compressor, the second heating means, the first
A cooling cycle leading to the cooling flow path of FIG. Thereby, the first air conditioner can be operated in the dehumidifying heating operation mode, and the second air conditioner can be operated in the heating operation mode.

Further, the cooling cycle (second cooling cycle) includes a compressor, an internal capacitor as the second heating means connected in series with the compressor, and an external capacitor connected in series with the internal capacitor. A heat exchanger, first expansion means disposed upstream of the external heat exchanger, a first bypass passage of the external heat exchanger opened and closed by first opening and closing means, and the external heat exchanger A first cooling passage connected between a junction of the bypass passage and the compressor, and having a first expansion unit for expanding the refrigerant passing therethrough and an evaporator as the first cooling unit arranged in series And a second cooling flow passage connected in parallel to the first cooling flow passage, and a second expansion means for expanding the refrigerant passing therethrough and an evaporator as the second cooling means arranged in series, A second bypass passage for connecting the downstream side to the compressor Kigaibu heat exchanger directly, is to include a second opening and closing means for opening and closing the second bypass passage (claim 5).

Therefore, according to the second cooling cycle, the external heat exchanger can be used as an evaporator by switching the first expansion means and communicating the second bypass passage with the second opening / closing means. Therefore, the cooling cycle can be operated without using the evaporators of the first and second air conditioners. In addition to the operation mode of the cooling cycle, only the heating of the first and second air conditioners is operated. Mode can be implemented. Furthermore, it is possible to heat only the second air conditioner.

Further, the cooling cycle (third cooling cycle) includes a compressor, an internal capacitor as the second heating means connected in series with the compressor, and an external capacitor connected in series with the internal capacitor. A heat exchanger, first expansion means disposed upstream of the external heat exchanger, a first bypass passage of the external heat exchanger opened and closed by first opening and closing means, and the external heat exchanger A first cooling passage connected between a junction of the bypass passage and the compressor, and having a first expansion unit for expanding the refrigerant passing therethrough and an evaporator as the first cooling unit arranged in series A second expansion means connected in parallel to the first cooling flow path and expanding a refrigerant passing therethrough, and a second cooling flow path in which an evaporator as the second cooling means is arranged in series. It is to comprise (claim 6).

This third cooling cycle eliminates the second bypass passage and the second opening / closing means of the second cooling cycle, so that the operation mode of the second air conditioner which only heats cannot be performed. However, the cost can be reduced by eliminating the bypass passage and the second opening / closing means.

The first and second expansion means are motorized valves capable of changing the cross-sectional area of the passage at a rate of 0 to 100% (claim 7), and the first and second expansion means are further provided. The third expansion means is a motor-operated valve capable of changing the cross-sectional area of the passage at a rate of 0 to 100% (Claim 8), and the first expansion means is provided downstream of the external heat exchanger. It is desirable that a check valve for preventing backflow from the first bypass passage side be provided before the junction with the bypass passage (claim 9).

Further, in the cooling cycle (fourth cooling cycle), a compressor, an internal capacitor as the second heating means connected in series to the compressor, and a serial connection to the internal capacitor are provided. First
Expansion means, an external heat exchanger disposed downstream of the first expansion valve, a first bypass passage bypassing the internal condenser and the first expansion means, and the internal condenser. Switching means for switching between a passage and the first bypass passage; and a first means connected between the external heat exchanger and the compressor for expanding a refrigerant passing therethrough.
A first cooling passage in which an expansion means and an evaporator as the first cooling means are arranged in series, and a second expansion which is connected in parallel to the first cooling passage and expands a passing refrigerant. A second cooling passage in which means and an evaporator as the second cooling means are arranged in series;
A second bypass passage for bypassing the cooling flow path of the first embodiment, and opening and closing means for opening and closing the second bypass passage.

In the fourth cooling cycle, an operation mode in which the second heating means is bypassed by switching the three-way valve to use the external heat exchanger as a condenser, and the second heating means is switched by switching the three-way valve. Since an operation mode in which the external heat exchanger is used as an evaporator while being used as a condenser is enabled, cooling, heating, and dehumidifying heating can be efficiently performed.

Incidentally, also in the fourth cooling cycle,
The first, second, and third expansion means are motor-operated valves capable of changing the cross-sectional area of the passage at a rate of 0 to 100% (claim 11), and are provided on the first bypass passage. ,
It is desirable to provide a check valve for preventing backflow from the downstream junction of the first bypass passage (claim 12). Further, a check valve is provided between the first expansion means and a downstream junction of the first bypass passage to prevent a backflow from a downstream junction of the first bypass passage. (Claim 13) is desirable.

Preferably, the first air conditioner is a front air conditioner for air conditioning the driver's seat side, and the second air conditioner is a rear air conditioner for air conditioning the rear passenger seat.

[0026]

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

The vehicle air conditioner 1 according to the present invention comprises a first air conditioner (front air conditioner) 2 and a second air conditioner (rear air conditioner).

The front-side air conditioner 2 has an outside air inlet 6 and an inside air inlet 8 which are opened on the upstream side of the air conditioning duct 4, and further selectively opens the outside air inlet 6 and the inside air inlet 8 as appropriate. The intake door 10 is provided. A blower 12 is arranged downstream of the intake door 10, and an evaporator (first evaporator) 14 as a cooling heat exchanger is arranged downstream of the blower 12.
A mix door 16 is provided downstream of the evaporator 14, and opens and closes a passage leading to a heater core 18 as a heating heat exchanger and a passage bypassing the heater core 18. The heater core 18 heats the air passing therethrough using the engine cooling water as a heat source, and the amount of air adjusted by the mix door 16 passes therethrough. Further, the air conditioning duct 4
A differential outlet 20, a vent outlet 22, and a foot outlet 24 are opened at the most downstream side of the air conditioner, and are appropriately opened by a mode door 26 according to the operation mode of the air conditioner.

The rear air conditioner 3 normally has only an inside air inlet 9 which opens on the upstream side of the air conditioning duct 5. However, it is also possible to form an outside air inlet and selectively open and close as appropriate with an intake door. A blower 13 is arranged downstream of the inside air inlet 9, and an evaporator (second evaporator) 15 as a cooling heat exchanger is arranged downstream of the blower 13.
A mixing door 17 is provided downstream of the second evaporator 15 so that a passage in which an internal condenser 19 as a heat exchanger for heating is arranged and a passage bypassing the internal condenser 19 are appropriately opened and closed. Has become. The internal condenser 19 is for heating the air passing therethrough using the refrigerant of the cooling cycle as a heat source.
The amount of air regulated by 7 is passed through. Further, a differential air outlet 21, a vent air outlet 23 and a foot air outlet 25 are opened at the most downstream side of the air conditioning duct 5, and are appropriately opened by a mode door 27 according to the operation mode of the air conditioner.

The cooling cycle (first cooling cycle) of the front air conditioner 2 and the rear air conditioner 3 is as follows.
The compressor 30, the external heat exchanger 33, the internal condenser 19, the receiver tank 34, the first electric valve 3
5 and a first cooling passage 90 formed by connecting the first evaporator 14 in series, and the first cooling passage 90
A second cooling passage 91 formed by connecting the second motor-operated valve 36 and the second evaporator 15 in series, and an accumulator 37 disposed on the suction side of the compressor 30. You. In addition, this first
In the cooling cycle, a bypass passage 52 that bypasses the external heat exchanger 33 is provided, and the three-way valve 32 selects a passage leading to the external heat exchanger 33 and the bypass passage 52. . Further, a check valve 53 for preventing a backflow from a junction with the bypass passage 52 is disposed downstream of the external heat exchanger 33.

A control unit 38 is provided to control the vehicle air conditioner 1 having the above configuration. In the control unit 38, a setting signal from an operation panel 39 for manually setting each operation mode or performing temperature setting, and at least an outside air temperature sensor 40,
Detection signals from the front side inside air temperature sensor 41, the rear side inside air temperature sensor 42, the solar radiation sensor 43, the temperature sensor 44 for detecting the evaporator temperature of the front side air conditioner, and the temperature sensor 45 for detecting the evaporator temperature of the rear side air conditioner Is input, processed by a predetermined program, and output from each control device as a control signal. The control devices of the vehicle air conditioner 1 include an actuator 46 for driving the intake door 10, a blower 12,
13, actuators 48 and 49 for driving the mix doors 16 and 17, actuators 50 and 51 for driving the mode doors 26 and 27, an external heat exchanger fan 34, an electric motor 31 for driving the compressor 30, first and second.
And the three-way valve 32. In this embodiment, the electric motor 31 of the compressor 30 is driven by the electric motor 31 for the purpose of reducing the load on the traveling engine and enabling heating of the rear air conditioner 3 even when the engine is stopped. However, the drive may be performed by being connected to a traveling engine via an electromagnetic clutch. In addition, the electric valve,
The cross-sectional area of the passage can be changed in a range of 0 to 100%. The passage can be made to function as an expansion valve by inserting a predetermined restriction, and the passage itself can be shut off. It has both the function and the function of the solenoid valve.

The operation mode of the vehicle air conditioner 1 having the first cooling cycle described above is, for example, as shown in Table 1 below.
It is shown in FIG. First, the first operation mode will be described. In this operation mode, both the front air conditioner (FRONT) 2 and the rear air conditioner (REAR) 3 are set to the dehumidifying heating mode. In this case, the three-way valve 3
2 communicates with the external heat exchanger 33 side (B), and the first electric valve 35 on the front side and the second electric valve 36 on the rear side are opened (in this case, the opening for performing the function as an expansion valve). This means the degree control, not the full opening), and the front and rear side mix doors 1
6 and 17 are also opened (indicating a state in which a passage leading to the heater cores 18 and 19 is opened), and the front and rear blowers 12 and 13 are set to operate. The heater core 18 is basically supplied with engine cooling water as a heat source. When the heater core 18 is unnecessary, the passage to the heater core 18 is closed by the mix door 16.

[0033]

[Table 1]

Thus, the refrigerant compressed by the compressor 30 is sent to the internal condenser 19 through the bypass passage 52 that bypasses the external heat exchanger 33, and radiates heat to the air passing there to condense. The condensed refrigerant passes through the receiver tank 34 to separate gas and liquid, passes through the electric valves 35 and 36, expands, and absorbs the heat of the air passing through the evaporators 14 and 15. And evaporate. Then, the operation returns from the accumulator 37 to the compressor 30. In this cooling cycle, the heat absorbed by the first and second evaporators 14 and 15 is radiated by one internal capacitor 19, so that the heating capacity of the internal capacitor 19 can be sufficiently ensured.

Further, regarding the front and rear air conditioners 2 and 3, the air (outside air or inside air) sucked by the blowers 12 and 13 is supplied to the evaporator 1.
It cools and dehumidifies by passing through 4,15. Then, the dehumidified air is heated to a predetermined temperature by passing through the heater core 18 and the internal condenser 19, and is blown out from the outlet selected by the mode doors 26 and 27. Thereby, the dehumidifying and heating mode is achieved on the front side and the rear side.

In the second operation mode, both the front and rear air conditioners 2 and 3 are set to the cooling mode. In this case, the three-way valve 32 is set to the (A) side, the first and second electric valves 35 and 36 are opened, the mix doors 16 and 17 are closed, and the blowers 12 and 13 are operated. Is set to

As a result, the compressed refrigerant discharged from the condenser 30 passes through the external heat exchanger 33 from the three-way valve 32, most of the heat is condensed by radiating heat, and is completely condensed by passing through the internal condenser 19. I do. At this time, since the heat is also radiated from the internal capacitor 19, the mix door 17 needs to be completely closed. And
After passing through the receiver tank 34, gas-liquid separation is performed.
The air passing through the first and second evaporators 14 and 15 is expanded by passing through the first and second evaporators 14 and 15, thereby absorbing the heat of the air passing therethrough and evaporating. And the accumulator 37
And returns to the compressor 30 via the.

The front and rear air conditioners 2,
3, the air sucked by the operation of the blowers 12 and 13 is supplied to the first and second evaporators 14 and 1.
5, the cooling mode can be set in the front and rear air conditioners 2 and 3.

In the third operation mode, the front air conditioner 2 is set to the dehumidifying and heating mode, and the rear air conditioner 3 is set to the off mode. In this case, such as when there are few occupants in the rear seats, there is a case where sufficient temperature control is possible by operating only the front air conditioner 2.

In this case, the three-way valve 32 is set to the (A) side, the first motor-operated valve 35 is opened, and the second motor-operated valve 36 is closed. Further, the front side mix door 16 is opened, the front side blower 12 is set to ON (ON), and the rear side blower 13 is set to stop (OFF). Although the rear mix door 17 is set to be closed in the front, it is not necessary to set the rear mix door 17 because the rear air conditioner 3 itself is in a stopped state.

Thus, the compressed refrigerant discharged from the compressor 30 flows through the three-way valve 32 to the external heat exchanger 3.
3 and is radiated and condensed in the external heat exchanger 33. Then, the gas passes through the internal condenser 19, expands at the first electric valve 35, absorbs heat at the first evaporator 14, and evaporates. Then, the flow returns to the compressor 30 via the accumulator 37. Therefore, the dehumidifying and heating mode of only the front air conditioner 2 can be performed.

Further, in the fourth operation mode, only the front side air conditioner is set to the cooling mode, the three-way valve 32 is set to the (A) side, the first motor-operated valve is opened, and the second motor-operated valve is operated. The front side mix door 16 is closed, the front side blower 12 is turned on, and the rear side blower 13 is turned off.
Thereby, the front side air conditioner flea cooling mode can be implemented.

The fifth operation mode is a mode in which the front air conditioner 2 is in the dehumidifying heating mode, the rear air conditioner 3 is in the heating (MAX heating) mode, and the three-way valve 32 is set to the (B) side. Then, the first motor-operated valve 35 is opened, the second motor-operated valve 36 is closed, and the front and rear side mix doors 1 are opened.
6 and 17 are both opened, and both the blowers 12 and 13 are set to ON. Thus, the refrigerant compressed by the compressor 30 is sent to the internal condenser 19 through the bypass passage 52 via the three-way valve 32. This internal capacitor 19
In, the refrigerant radiates heat to the passing air and condenses, expands at the first electric valve 35 via the receiver tank 34, absorbs the heat of the air passing at the first evaporator 14, and evaporates. Then, the flow returns to the compressor 30 via the accumulator 37.

Therefore, in the front air conditioner 2, the air sucked by the blower 12 is cooled and dehumidified by the first evaporator 14, and is heated by the heater core 18 to obtain air heated to a desired temperature. . Also, in the rear air conditioner 3, the second evaporator 15 is not operating, so that the air sucked by the blower 13 passes through the internal condenser 19 and is heated. Thus, the fifth operation mode can be performed. In the rear air conditioner 3, since the second cooling passage leading to the second evaporator 15 is closed, the cooling of the air by the evaporator 15 is not performed. (MAX heating) in the table. The same applies hereinafter.

A second cooling cycle according to the present invention is as shown in FIG. This second cooling cycle includes a compressor 30 and an internal condenser 19 disposed in the rear air conditioner 3 connected to the compressor 30.
From the internal capacitor 19 to the first solenoid valve (SV1) 6
An external heat exchanger 33 connected through a circuit in which the heat exchanger 6 and the expansion valve 67 are connected in parallel; a fourth external heat exchanger 33 connected to the external heat exchanger 33 via a check valve 69 and a receiver tank 34;
A first cooling passage 90 in which an electromagnetic valve (SV4) 61 and an expansion valve 63 are connected in series, and a fifth electromagnetic valve (SV5) 62 connected in parallel to the first cooling passage 90 A second cooling passage 91 in which a valve 64 is arranged in series, an accumulator 37 connected in series to the first cooling passage 90 and the second cooling passage 91, and a first solenoid valve (SV1). A first bypass passage 70 which bypasses the circuit in which the expansion valve 67 and the expansion valve 67 are connected in parallel, bypasses the external heat exchanger 33 and the check valve 69, and directly connects the internal condenser 19 and the receiver tank 34. A second solenoid valve (SV2) 65 for opening and closing the first bypass passage 70;
And a third solenoid valve (SV3) 68 that opens and closes the second bypass passage 72. The second solenoid valve (SV3) 68 opens and closes the second bypass passage 71. In the second embodiment, the first and second cooling passages 90 and 91 are formed by connecting fourth and fifth solenoid valves 61 and 62 and expansion valves 63 and 64 in series. Used in the first embodiment.
And a second motor-operated valve.

In the second cooling cycle having the above configuration, for example, the operation modes shown in Table 2 below are set. First, in the first operation mode, both the front air conditioner 2 and the rear air conditioner 3 are set to the dehumidifying and heating mode, the first solenoid valve (SV1) 66 is closed, and the second solenoid valve (SV2) 65, the third solenoid valve (SV3) 68 is opened, the fourth and fifth solenoid valves (SV4) and (SV5) 61 and 62 are opened, the mix doors 16 and 17 are both opened, and the blower 12 is opened. And 13 both operate (ON)
And Thereby, in this operation mode, the first solenoid valve 66 is closed, so that the internal capacitor 1
Since the refrigerant having discharged 9 passes through the expansion valve 67, the external heat exchanger 33 functions as an evaporator. Further, since the first and second bypass passages 70 and 71 are connected by the second solenoid valve 65 and the third solenoid valve 68,
Three cooling passages are formed downstream of the internal condenser 19. Therefore, the first and second evaporators 14 and 15 of the first and second cooling passages 90 and 91 are provided.
Since the heat absorbed by the external heat exchanger and the heat absorbed by the external heat exchanger are radiated by the internal condenser 19, the heating amount of the rear air conditioner 5 can be sufficiently secured.

[0047]

[Table 2]

Accordingly, the air cooled and dehumidified by the first and second evaporators 14 and 15 can be heated to a desired temperature by the heater core 18 and the internal condenser 19. The dehumidifying and heating mode can be performed.

In the second operation mode, both the front and rear air conditioners 2 and 3 are set to the cooling mode. The first solenoid valve 66 is opened, the second solenoid valve 65 is closed,
The third solenoid valve 68 is closed, and the fourth and fifth solenoid valves 6 are closed.
1,62 open, mix doors 16 and 17 open, blower 1
2 and 13 are operated (ON). Thus, the second and third bypass passages 70 and 71 are closed. Then, since the first electromagnetic valve 66 is opened, the refrigerant bypasses the expansion valve 67, and the external heat exchanger 33 becomes an external heat exchanger.

Therefore, the refrigerant discharged from the compressor 30 is condensed in the internal condenser 19 and the external heat exchanger 33, and flows through the receiver tank 34 to the first and second cooling passages 90 and 91. In the first and second evaporators 14 and 15 of the first and second cooling passages 90 and 91, the heat of the air passing through the first and second evaporators 14 and 15 is absorbed to cool the air. Do. In particular, in the rear air conditioner 3, although the heat is generated from the internal condenser 19, the cooling mode is achieved by closing the passage leading to the internal condenser 19 with the mix door 17.

In the third operation mode, only the front side is set to the dehumidifying and heating mode. The first solenoid valve 66 is closed, the second solenoid valve 65 is opened, the third solenoid valve 68 is opened, The fourth solenoid valve 61 is opened, the fifth solenoid valve 62 is closed, the front mix door 16 is opened, and the rear mix door 17 is opened.
Is closed, and only the front blower 12 is operated. Thereby, since the rear air conditioner 3 is stopped in the first operation mode, the dehumidifying and heating mode of only the front air conditioner 2 can be performed.

In the fourth operation mode, only the front side is set to the cooling mode. This is also a configuration in which the rear air conditioner 3 is stopped in the second operation mode. Thereby, only the front side air conditioner 2 can be set to the cooling mode.

The fifth operation mode is for setting the front side to the dehumidification heating mode and the rear side to the heating mode.
, The second solenoid valve 65 is opened, the third solenoid valve 68 is opened, the fourth solenoid valve 61 is opened, and the fifth solenoid valve 62 is opened.
Closed, mix doors 16 and 17 closed, blowers 12 and 13
Is to operate. Therefore, compressor 3
The refrigerant discharged from 0 passes through the internal condenser 19 to radiate heat and condense, and the two evaporators to be arranged in parallel by the first and second bypass passages 70 and 71 communicated with each other. The heat is absorbed and evaporated by the heat exchanger 33 and the first evaporator 14. The second
Of the cooling passage 91 is closed. Thereby, the front side air conditioner 2 can operate in the dehumidifying heating mode. Further, the rear air conditioner 3 operates in the heating mode because the second cooling passage 91 is closed.

The sixth operation mode is a mode in which both the front side and the rear side are set to the heating mode, and is enabled by the second cooling cycle. in this case,
The first solenoid valve 66 is closed, the second solenoid valve 65 is closed, the third solenoid valve 68 is opened, the fourth and fifth solenoid valves 61 and 62 are closed, the mix doors 16 and 17 are opened, 12 and 13 are turned on. Thereby, the refrigerant discharged from the compressor 30 radiates heat in the internal condenser 19 and condenses,
The heat is expanded in the expansion valve 67 and evaporates in the external heat exchanger 33 serving as an evaporator. Since this cooling cycle operates only for the rear air conditioner 3, the heating amount of the rear air conditioner 3 can be sufficiently secured. In the front-side air conditioner, only the heater core 18 is operated, and the mix door 16 is connected to the heater core 18.
Open the passage to. As a result, the heating mode is enabled in the front and rear air conditioners 2 and 3.

The third cooling cycle shown in FIG. 3 is obtained by removing the second bypass passage 71 and the third solenoid valve 68 from the second cooling cycle shown in FIG. As a result, although the operation mode in which both the front and rear air conditioners 2 and 3 are in the heating mode becomes impossible,
The cost can be reduced.

In the third cooling cycle, the first operation mode shown in Table 3 below sets both the front and rear air conditioners 2 and 3 to the dehumidifying and heating mode. 65, the fourth and fifth solenoid valves 6
1 and 62 are opened, the mix doors 16 and 17 are opened, and the blowers 12 and 13 are operated. In this case, although the first solenoid valve 66 is closed, the refrigerant flows little through the external heat exchanger 33 because the first bypass passage 70 is connected.

[0057]

[Table 3]

As a result, the refrigerant discharged from the compressor 30 is radiated and condensed in the internal condenser 19, and flows from the first bypass passage 70 to the first and second cooling passages 90 and 91. Therefore, since the air cooled and dehumidified by the first and second evaporators 14 and 15 can be heated by the heater core 18 and the internal condenser 19, the dehumidifying and heating mode can be performed in the front and rear air conditioners 2 and 3. .

The second operation mode is for setting the front and rear air conditioners 2 and 3 to the cooling mode.
, The second electromagnetic valve 65 is closed, the fourth and fifth electromagnetic valves 61 and 62 are opened, the mix doors 16 and 17 are closed, and the blowers 12 and 13 are operated. Thereby, the refrigerant discharged from the compressor 30 is:
The external heat exchanger 33 which is condensed by the internal condenser 19 and becomes a condenser by opening the first solenoid valve 66.
The heat is condensed. Then, the first and second cooling passages 9
At 0 and 91, expansion is performed by the first and second expansion valves 63 and 64, and endothermic evaporation is performed by the first and second evaporators. Further, in the rear air conditioner 3, the passage leading to the internal condenser 19 is closed by the mix door 17, so that the front and rear air conditioners 2, 3 are operated in a cooling mode.

In the third operation mode, only the front side is set to the dehumidifying and heating mode. The first solenoid valve 66 is closed, the second solenoid valve 65 is opened, the fourth solenoid valve 61 is opened, The fifth solenoid valve 62 is closed, the front mix door 16 is opened, the rear mix door 17 is closed, and only the front blower 12 is operated. As a result, the rear air conditioner 3 is stopped in the first operation mode.
Only the dehumidifying and heating mode can be performed.

In the fourth operation mode, only the front side is set to the cooling mode. This is also a configuration in which the rear air conditioner 3 is stopped in the second operation mode. Thereby, only the front side air conditioner 2 can be set to the cooling mode.

The fifth operation mode is for setting the front side to the dehumidifying heating mode and the rear side to the heating mode.
, The second solenoid valve 65 is opened, the fourth solenoid valve 61 is opened, the fifth solenoid valve 62 is closed, and the mix door 1 is closed.
6 and 17 are opened, and the blowers 12 and 13 are operated. As a result, the refrigerant discharged from the compressor 30 is radiated and condensed by the internal condenser 19, and then passes through the first bypass passage 70 to reach the first cooling passage 90. Then, the heat is absorbed and evaporated by the first evaporator 14 and returns to the compressor 30. Therefore, in the front side air conditioner 2, the first evaporator 1
4 is heated by the heater core 18 and heated in the heater core 18 to be in a dehumidifying and heating mode. In the rear air conditioner 3, the second evaporator 15 does not operate. Is the internal capacitor 19
Heating mode, so that the heating mode is set.

The fourth cooling cycle shown in FIG. 4 includes a compressor 30, an internal condenser 19 arranged in the rear air conditioner 3, a third motor-operated valve (EMV 3) 82, and an external heat exchanger 33. A first cooling passage 90 having a first motor-operated valve (EMV1) 35 and a first evaporator 14;
And the second motor-operated valve
A second cooling passage 91 having an (EMV2) 36 and a second evaporator 15; an accumulator 37; and a third bypass passage 85 bypassing the internal condenser 19 and the third electric valve 82. A three-way valve 8 provided in the vicinity of the discharge port of the compressor 30 for switching between the internal condenser 19 side and the first bypass passage 85 side
6, a check valve 84 provided on the third bypass passage 85 for preventing a backflow from the junction of the third bypass passage 85, and a check valve 84 similarly disposed on the outflow side of the third electric valve 82. A check valve 83 for preventing backflow from the junction of the third bypass passage 85 and a fourth bypass passage 81 for bypassing the first and second cooling passages 90 and 91.
And a sixth solenoid valve 80 that opens and closes the fourth bypass passage 81.

In the fourth cooling cycle of this configuration,
The first operation mode shown in Table 4 below sets both the front and rear air conditioners 2 and 3 to the dehumidifying and heating mode, switches the three-way valve 86 to the (D) side, and sets the sixth operation mode to the sixth operation mode.
, The third electric valve 82 is opened, the first and second electric valves 35 and 36 are opened, the mix doors 16 and 17 are opened, and the blowers 12 and 13 are operated.
When the third motor-operated valve 82 is opened, the opening degree control is performed as necessary in order to use the third motor-operated valve 82 as an expansion valve.

[0065]

[Table 4]

As a result, the refrigerant discharged from the compressor 30 flows through the three-way valve 86 through the internal condenser 19.
And heat is condensed here. And the third motor-operated valve 8
2 and is evaporated in the external heat exchanger 33.
The evaporation in the external heat exchanger 33 is performed by the third electric valve 82.
Controls the degree of evaporation. Specifically, the first
The first and second evaporators 14 and 15 in the second cooling passages 90 and 91 are controlled so that the remaining evaporation is performed. Therefore, the first and second evaporators 14 and 15 can cool and defrost the air passing therethrough at a predetermined rate, and the cooled air is heated by the heater core 18 or the internal condenser 19. The front and rear air conditioners 2, 3
, The dehumidifying and heating mode is performed.

In the second operation mode, both the front and rear air conditioners 2 and 3 are set to the cooling mode, the three-way valve 86 is switched to the (C) side, and the sixth solenoid valve 80 is operated. This is for closing, opening the first and second electric valves 35 and 36, closing the mix doors 16 and 17, and operating the blowers 12 and 13. Thereby, the compressor 30
The refrigerant discharged from the first heat exchanger passes through the third bypass passage 85 via the three-way valve 86 and reaches the external heat exchanger 33. Then, the heat is condensed by radiating the external heat exchanger 33 as an external heat exchanger and reaches the first and second cooling passages 90 and 91. In the first and second cooling passages 90 and 91, the first and second electric valves 35 and 36 expand, and
And the second evaporators 14 and 15 perform endothermic evaporation. Accordingly, since the air passing through the first and second evaporators 14 and 15 is cooled, the cooling mode is performed in the front and rear air conditioners 2 and 3.

In the third operation mode, the dehumidifying and heating mode is performed only on the front side, the three-way valve 86 is switched to the (C) side, the sixth solenoid valve 80 is closed, and the first electric valve 3 is closed.
5, the second electric valve 36 is closed, the mix door 16 is opened, the mix door 17 is closed, and only the blower 12 is operated. As a result, the refrigerant discharged from the compressor 30 is radiated and condensed in the external heat exchanger 33,
, And is absorbed and evaporated by the first evaporator 14. Therefore, the rear side air conditioner 3 is stopped, and the cooling / dehumidifying saleta air can be heated by the heater core 18 by the first evaporator 14, so that only the front side air conditioner 2 is dehumidified and heated.

In the fourth operation mode, only the front side performs the cooling mode. The three-way valve 86 moves to the (C) side, the sixth solenoid valve 80 closes, the first motor-operated valve 35 opens, and the fourth operation mode. 2 motorized valve 36 closed, mix doors 16 and 17 closed, blower 1
Only 2 is operated. Thus, since the mix door 16 is closed with respect to the third operation mode, the heating process in the heater core 18 is omitted, and the cooling mode of only the front air conditioner 2 is performed. Things.

In the fifth operation mode, the front side is set to the dehumidifying heating mode and the rear side is set to the heating mode. The three-way valve 86 is set to (D), the sixth solenoid valve 80 is closed, and the third electric valve is set. 82 is opened (opening degree control), the first electric valve 35 is opened, the second electric valve 36 is closed, the mix doors 16 and 17 are opened, and the blowers 12 and 13 are operated. Thus, the refrigerant discharged from the compressor 30 is radiated and condensed by the internal condenser 19, and is absorbed and evaporated by the external heat exchanger 33 in an amount adjusted by the third electric valve 82. Further, the refrigerant is expanded by the first motor-operated valve 35 and is absorbed and evaporated by the first evaporator 14. Thereby, in the front side air conditioner 2, the cooling power of the first evaporator pad 14 is adjusted by the third and first electric valves 82 and 35, and the passing air is cooled and dehumidified by the adjusted capacity.
Then, since the air is heated by the heater core 18, the dehumidifying and heating mode is performed in the front air conditioner 2. The heat absorbed by the external heat exchanger 33 and the first evaporator 14 is transferred to the internal condenser 1.
Since the heat is radiated at 9, the heating capacity of the rear air conditioner 3 can be sufficiently ensured.

In the sixth operation mode, both the front side and the rear side are set to the heating mode. The three-way valve is set to (D), the sixth solenoid valve 80 is opened, and the first and second electric valves 35 are set. , 36 are closed, the mix doors 16 and 17 are opened, and the blowers 12 and 13 are operated. As a result, the refrigerant discharged from the compressor 30 reaches the internal condenser 19 from the three-way valve 86 and radiates and condenses here. Then, the refrigerant expands in the third motor-operated valve 82, and then absorbs and evaporates in the external heat exchanger 33. Then, it passes through the second bypass passage 81 to reach the accumulator 37 and returns to the compressor 30. Therefore, in the front air conditioner 2 and the rear air conditioner 3, the evaporators 14 and 15 do not operate, and only the heat exchange by the heater core 18 and the internal condenser 19 as the heating means is performed. The heating operation in the devices 2 and 3 becomes possible.

[0072]

As described above, according to the present invention, the heating means of one air conditioner is a heater core using engine cooling water as a heat source, and the heating means of the other air conditioner is a heat radiation step of a cooling cycle. By using the condenser, the shortage of capacity as a heat source of the engine cooling water can be compensated.

Further, since the heat radiation process of the refrigerant is used as a heat source, the air conditioner has a rapid warming property, so that the responsiveness of air conditioning can be improved. Can be performed.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a vehicle air conditioner provided with a first cooling cycle.

FIG. 2 is an explanatory diagram showing a configuration of a second cooling cycle.

FIG. 3 is an explanatory diagram showing a configuration of a third cooling cycle.

FIG. 4 is an explanatory diagram showing a configuration of a fourth cooling cycle.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vehicle air conditioner 2 Front side air conditioner 3 Rear side air conditioner 12, 13 Blower 14 1st evaporator 15 2nd evaporator 16, 17 Mix door 18 Heater core 19 Internal condenser 30 Compressor 33 External heat exchanger 90 1st Cooling passage 91 Second cooling passage

Claims (13)

[Claims] 1. An air-conditioning duct having at least a suction port on the most upstream side and an air outlet on the most downstream side, a first air blowing unit, a first cooling unit constituting a part of a cooling cycle,
A first air conditioner comprising: first heating means using engine cooling water as a heat source; and first heating amount adjusting means for adjusting an amount of air passing through the first heating means; A second air blowing means, a second cooling means constituting a part of a cooling cycle, and a second cooling means, a condenser of a cooling cycle, are provided in an air-conditioning duct having an inlet on the side and an outlet on the most downstream side. An air conditioner for a vehicle, comprising: a second air conditioner having a second heating means and a second heating amount adjusting means for adjusting an amount of air passing through the second heating means. 2. The cooling cycle includes a compressor, an external heat exchanger connected in series to the compressor, a bypass passage bypassing the external heat exchanger, a passage leading to the external heat exchanger, and the bypass. Switching means for switching the passage, an internal condenser as the second heating means connected in series to the external heat exchanger and the bypass passage, and disposed between the internal condenser and the compressor;
A first cooling channel in which a first expansion unit for expanding the passing refrigerant and an evaporator as the first cooling unit are arranged in series; and a first cooling channel is connected in parallel to the first cooling channel and passes therethrough. The vehicle air conditioner according to claim 1, further comprising: a second expansion unit that expands the refrigerant; and a second cooling channel in which an evaporator as the second cooling unit is arranged in series. 3. A vehicle air conditioner according to claim 2, wherein said first and second expansion means are motor-operated valves capable of changing a cross-sectional area of a passage at a rate of 0 to 100%. apparatus. 4. A non-return valve for preventing back flow from the side of the bypass passage is provided downstream of the external heat exchanger before a junction with the bypass passage. The vehicle air conditioner according to claim 2 or 3. 5. The cooling cycle includes: a compressor; an internal condenser as the second heating means connected in series with the compressor; an external heat exchanger connected in series with the internal condenser; A first expansion means arranged upstream of the heat exchanger; a first expansion means of an external heat exchanger opened and closed by the first opening and closing means;
A first expansion means connected between the junction of the external heat exchanger and the bypass path and the compressor, and an evaporator as the first cooling means, for expanding the refrigerant passing therethrough; , A second expansion means connected in parallel to the first cooling flow path for expanding the refrigerant passing therethrough, and an evaporator as the second cooling means are arranged in series. A second cooling passage, a second bypass passage that directly connects the downstream side of the external heat exchanger and the compressor, and a second opening / closing unit that opens and closes the second bypass passage. The vehicle air conditioner according to claim 1, wherein 6. The cooling cycle includes: a compressor; an internal condenser as the second heating means connected in series to the compressor; an external heat exchanger connected in series to the internal condenser; A first expansion means arranged upstream of the heat exchanger; a first expansion means of an external heat exchanger opened and closed by the first opening and closing means;
A first expansion means connected between the junction of the external heat exchanger and the bypass path and the compressor, and an evaporator as the first cooling means, for expanding the refrigerant passing therethrough; , A second expansion means connected in parallel to the first cooling flow path for expanding the refrigerant passing therethrough, and an evaporator as the second cooling means are arranged in series. The vehicle air conditioner according to claim 1, further comprising a second cooling channel provided. 7. The first expansion means has a solenoid valve and an expansion valve connected in parallel, and the second and third expansion means have a solenoid valve and an expansion valve connected in series. The vehicle air conditioner according to claim 5 or 6, wherein: 8. The first, second and third inflation means,
The vehicle air conditioner according to claim 5, 6 or 7, wherein the motor-operated valve is capable of changing the cross-sectional area of the passage at a rate of 0 to 100%. 9. A non-return valve for preventing a back flow from the first bypass passage is provided downstream of the external heat exchanger before a junction with the first bypass passage. The vehicle air conditioner according to claim 5, 6 or 7, wherein 10. The cooling cycle includes: a compressor; an internal condenser as the second heating means connected in series to the compressor; a first expansion means connected in series to the internal condenser; An external heat exchanger disposed downstream of a first expansion valve; a first bypass passage bypassing the internal condenser and the first expansion means; a passage leading to the internal condenser; Switching means for switching between a bypass passage and a first expansion means connected between the external heat exchanger and the compressor for expanding a refrigerant passing therethrough and an evaporator as the first cooling means are arranged in series; A first cooling flow path, a second expansion means connected in parallel to the first cooling flow path and expanding the refrigerant passing therethrough, and an evaporator as the second cooling means. A second cooling passage in which data is arranged in series, a second bypass passage for bypassing the first and second cooling passages, and an opening / closing means for opening and closing the second bypass passage. The vehicle air conditioner according to claim 1, further comprising: 11. A motor-operated valve according to claim 10, wherein said first, second and third expansion means are motorized valves capable of changing the cross-sectional area of the passage at a rate of 0 to 100%. Vehicle air conditioners. 12. The check valve according to claim 10, wherein a check valve is provided on the first bypass passage to prevent a backflow from a downstream junction of the first bypass passage. An air conditioner for a vehicle as described in the above. 13. A check valve for preventing backflow from a downstream junction of the first bypass passage between the first expansion means and a downstream junction of the first bypass passage. 12. The device according to claim 10, wherein the device is provided.
3. The vehicle air conditioner according to 2.