WO2014017022A1

WO2014017022A1 - Air-conditioning system

Info

Publication number: WO2014017022A1
Application number: PCT/JP2013/003990
Authority: WO
Inventors: 進和久田; 馬場　公一郎; 大村　充世; 大輔瀬戸口; 小川　規子; 康浩赤堀
Original assignee: トヨタ車体株式会社
Priority date: 2012-07-25
Filing date: 2013-06-26
Publication date: 2014-01-30
Also published as: JP5849885B2; JP2014024413A

Abstract

This air-conditioning system is equipped with: a first air-conditioning unit (12) which is provided at one location in the passenger compartment and blows air-conditioning wind from a first evaporator (5); a second air-conditioning unit (13) which is provided at another location in the passenger compartment and blows air-conditioning wind from a second evaporator (6); a car refrigerator which constitutes a limited-space air-conditioning unit (4) for cooling the inside of a locally defined limited space (4a) by means of a dedicated evaporator (7); and a compressor (9) for pumping a refrigerant to the first and second evaporators (5, 6) and the dedicated evaporator (7). When only the limited-space air-conditioning unit, which cools only the inside of the limited space (4a) by using the dedicated evaporator (7), is in operation, a small amount of air-conditioning wind which has passed the first evaporator (5) or the second evaporator (6) is blown toward a window (1w) in the passenger compartment (2). Consequently, fogging of the window in the passenger compartment can be prevented when only the limited-space air-conditioning unit is in operation.

Description

Air conditioner

Cross-reference of related applications

This application is based on Japanese Patent Application No. 2012-165024 filed on July 25, 2012, the disclosure of which is incorporated herein by reference.

The present disclosure relates to an air conditioner including an air conditioning unit that air-conditions a limited space and an air conditioning unit that air-conditions another space.

Conventionally, the air conditioner described in Patent Document 1 is a dual cycle of a front seat evaporator and a rear seat evaporator of a vehicle, and the rear seat evaporator is not noticed when the front seat evaporator is operated independently. The purpose is to operate and return the oil. Therefore, in a dual refrigeration cycle that uses a front seat evaporator and a rear seat evaporator, when the front seat is operated independently, the wind is not blown into the passenger compartment while the wind flows through the rear seat evaporator. In the side trim (inside the vehicle side surface interior member) or the drain hose, the rear seat evaporator is operated without being noticed by the occupant, thereby eliminating the discomfort of the occupant.

JP 2009-241773 A

By the way, there is a need to operate, for example, a vehicle refrigerator (also referred to as a limited space air-conditioning unit), which is a limited space air-conditioning unit, in a dual (including triple or more) cycle using the limited-space air conditioning unit. In a limited space air conditioning unit that uses a refrigeration cycle, when the maximum cooling performance is required, if the limited space air conditioning unit is used, the air conditioning capability is deprived, so the ejector cycle method or the parallel cycle method is adopted. In the case of such a cycle method, a control valve such as an electromagnetic valve that controls opening / closing of the refrigerant flow (on / off) may not be provided in each refrigerant passage that flows in a branched manner in consideration of cost.

In such a state, if the limited space air conditioning unit can be operated independently, the ejector cycle system connects the front seat evaporator and the limited space air conditioning unit with a pipe. The refrigerant cannot be stopped. Even in the case of the parallel cycle system, the limited space air-conditioning unit cannot be operated independently because there is no control valve in each refrigerant passage flowing in parallel. For example, if the compressor is stopped, the limited space air-conditioning unit cannot be cooled, and only the blower motor in the warehouse operates, and conversely, the interior of the limited-space air conditioning unit may be warmed by the motor operating heat. The control valve is eliminated not only for cost reduction but also as a countermeasure against hammer noise when the control valve is activated.

In this case, when the idea of Patent Document 1 is simply applied, the limited space air-conditioning unit is operated, and the wind flows to the other evaporators (for example, the front seat evaporator and the rear seat evaporator), It will be discharged from the side trim and drain hose. In this way, it is possible to make it appear as if only the limited space air-conditioning unit is operating without performing air conditioning using the front seat evaporator or the rear seat evaporator. However, in this case, the wind passing through the front seat evaporator or the rear seat evaporator is not blown into the vehicle interior. Therefore, there is a possibility that the window in the passenger compartment is fogged.

This indication is made paying attention to the above-mentioned point, and the purpose is provided in the first air-conditioning part which is provided in one place in the room and blows off the conditioned air, and is provided in the other place in the room. In the air conditioner using the second air conditioning unit that blows out the conditioned air and the third air conditioning unit that cools the locally limited space, the window in the vehicle compartment is used when the third air conditioning unit is operated independently. It is in suppressing cloudiness.

According to one aspect of the present disclosure, an air conditioner includes a first air conditioner that includes a first evaporator provided at one place in a room and that blows conditioned air that has passed through the first evaporator, and the other air conditioner in the room. A second air-conditioning unit that is provided in a location and that includes the second evaporator and blows out the conditioned air that has passed through the second evaporator; and a locally-limited space is cooled using the third evaporator. 3 air-conditioning part, and the compressor which pumps a refrigerant | coolant to a 1st and 2nd evaporator and a 3rd evaporator. When the single operation of the third air conditioning unit that cools only the limited space using the third evaporator is set, the first air conditioning unit or the second air conditioning unit blows conditioned air into the room.

According to this, when switching to the single operation of the third air conditioning unit, the conditioned air that has passed through the first evaporator or the second evaporator is blown into the room despite the third operation of the third air conditioning unit. Therefore, the indoor window fogging can be suppressed.

The air conditioner may further include a display unit that displays an operating state of the first air conditioning unit or the second air conditioning unit. In this case, in the independent operation of the third air conditioning unit, the display unit seems to be inoperative although the first air conditioning unit or the second air conditioning unit is in operation. May be displayed. According to this, it can be emphasized that it is an independent operation of the third air conditioning unit.

It is a schematic diagram of an air-conditioner for vehicles in a 1st embodiment of this indication. It is the schematic which shows the refrigerant cycle for the vehicle air conditioner in 1st Embodiment. It is the schematic which shows the air-conditioning control apparatus in 1st Embodiment. It is the schematic which shows the refrigerant cycle for the vehicle air conditioner in 2nd Embodiment of this indication.

Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also the embodiments are partially combined even if they are not clearly specified unless there is a problem with the combination. It is also possible.
(First embodiment)
The structure of the vehicle air conditioner according to the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 3. The vehicle 1 has a driver seat, a front passenger seat, and a rear seat disposed on the rear side of the front seat in a passenger compartment 2 that is a room. The vehicle compartment 2 forms a long space in the front-rear direction of the vehicle 1. The vehicle compartment 2 has a floor surface 3. Moreover, the refrigerator 4 for vehicles used as an example of the limited space air-conditioning part (3rd air-conditioning part) in which a passenger | crew cools a drink etc. is provided. The vehicular refrigerator 4 has an internal space 4a that forms a limited space that is locally limited. The limited space may be a partitioned partition space. The limited space may be a normally closed space.

The air conditioner has a refrigeration cycle including a plurality of

evaporators

5, 6, and 7 (first evaporator, second evaporator, and third evaporator). This refrigeration cycle includes a compressor 9 that is driven via an electromagnetic clutch 8 by a vehicle engine (not shown). The gas phase refrigerant is compressed to a high temperature and a high pressure by the compressor 9.

The refrigeration cycle includes a condenser 10 that exchanges heat between the gas-phase refrigerant discharged from the compressor 9 and the outside air blown by a cooling fan (not shown) to liquefy and condense. The refrigeration cycle includes a liquid receiver 11 that separates the refrigerant that has passed through the condenser 10 into a liquid phase refrigerant and a gas phase refrigerant and retains the liquid phase refrigerant therein.

The vehicle air conditioner according to the first embodiment includes a plurality of air conditioners 12, 13 (first air conditioner, second air conditioner) and vehicle refrigerator 4 (limited section air conditioner, third air conditioner). That is, it is a dual air conditioner type vehicle air conditioner having the vehicle refrigerator 4. The vehicular refrigerator 4 has a dedicated evaporator 7 (third evaporator) of the vehicular refrigerator 4 that cools the internal space (limited space) 4a.

First, the front seat air conditioning unit 12 as an example of the first air conditioning unit will be described. In the present embodiment, the first air conditioning unit is the front seat air conditioning unit 12, but has an evaporator 5 (first evaporator) provided at a position closer to the compressor 9 than the rear seat evaporator 6. Can be defined as a part.

The front seat air-conditioning unit 12 is disposed inside an instrument panel (not shown) in the foremost part in the passenger compartment 2. The front seat air conditioning unit 12 air-conditions the front seat area in the passenger compartment 2. The front seat air conditioning unit 12 includes a front seat case 14 that forms an air passage. An inside air inlet and an outside air inlet (not shown) are formed on the upstream side of the front seat case 14. In addition, a front seat switching door, which is an inside / outside air switching door (not shown) for opening and closing both inlets, is provided.

The front seat air conditioning unit 12 includes a front seat expansion valve 15 that expands the liquid-phase refrigerant flowing out of the liquid receiver 11 to a low temperature and a low pressure. The front seat air conditioning unit 12 includes a front seat evaporator 5 as an example of a first evaporator that evaporates the low-temperature and low-pressure refrigerant flowing out from the front seat expansion valve 15 by absorbing heat from the conditioned air.

The front seat expansion valve 15 is a temperature type expansion valve that automatically adjusts the valve opening so as to maintain the refrigerant superheat degree at the outlet of the front seat evaporator 5 at a predetermined value. The front seat air conditioning unit 12 includes a front seat blower 16 that blows the inside air or the outside air to the front seat evaporator (first evaporator) 5. The front seat blower 16 is an electrically driven electric blower.

The compressor 9, the condenser 10, and the liquid receiver 11 are mounted in an engine room 17 on the front side of the vehicle compartment (indoor) 2. On the other hand, the front seat blower 16, the front seat evaporator 5, and the front seat expansion valve 15 are provided inside the front seat case 14.

The front seat evaporator 5 is disposed downstream of the front seat blower 16 in the front seat case 14. The front seat air conditioning unit 12 includes an evaporator temperature sensor 18 immediately downstream of the front seat evaporator 5 in the front seat case 14. In addition, the front seat air conditioning unit 12 includes a front seat heater core 19 that heats the conditioned air with hot water from the vehicle engine as a heat exchanger for heating on the downstream side of the front seat evaporator 5 in the front seat case 14. .

Further, a bypass path 20 formed of an air passage is formed on the side of the front seat heater core 19 in the front seat case 14. The front seat air-conditioning unit 12 is a plate that adjusts the air volume ratio between the warm air heated through the front seat heater core 19 and the cold air passing through the bypass passage 20 according to the rotation position to adjust the blown air temperature. The front seat air mix door 21 is provided. The front seat air mix door 21 is provided adjacent to the front seat heater core 19.

Next, at the downstream end of the front seat case 14, a front seat defroster opening 13a, a front seat face opening 13b, and a front seat foot opening 13c are formed as is well known. The three

openings

13a, 13b, and 13c are the only openings that are provided to blow out the conditioned air to the front seat. The front seat defroster opening 13a blows conditioned air having a temperature equal to or higher than the outside air temperature toward the inner surface of the window 1w (windshield) of the vehicle 1 in the differential mode (also referred to as defroster mode). The front seat face opening 13b blows conditioned air toward the head of the front seat occupant. The front seat foot opening 13c blows conditioned air toward the foot.

These three

openings

13a, 13b, and 13c are provided with front seat mode doors that open and close the openings. The front seat mode door includes a front seat defroster door, a front seat face door, and a front seat foot door. These three mode doors are controlled to open and close in accordance with the front seat blowing mode. The front seat defroster door opens and closes the front seat defroster opening 13a. The front seat face door opens and closes the front seat face opening 13b. The front seat foot door opens and closes the front seat foot opening 13c.

Next, the rear seat air conditioning unit 13 as an example of the second air conditioning unit will be described. In the present embodiment, the second air conditioning unit is the rear seat air conditioning unit 13, but the rear seat evaporator 6 (second evaporator) provided at a position farther from the front seat evaporator 5 than the compressor 9 is provided. It can also be defined as having an air conditioning unit.

The rear seat air-conditioning unit 13 constituting the second air-conditioning unit is disposed in the rear part of the passenger compartment 2. The rear seat air conditioning unit 13 air-conditions the area of the rear seat in the passenger compartment 2. The rear seat air conditioning unit 13 includes a rear seat case 22 that forms a rear seat air passage. Inside the rear seat case 22, an inside air inlet and an outside air inlet (not shown) are formed. In addition, a rear seat switching door (not shown) for opening and closing both inlets is provided.

The rear seat air conditioning unit 13 includes a rear seat expansion valve 23 that expands the liquid-phase refrigerant that has flowed out of the receiver 11 to low temperature and low pressure. The rear seat air conditioning unit 13 includes a rear seat evaporator 6 as an example of a second evaporator that absorbs low-temperature and low-pressure refrigerant from the conditioned air to evaporate. The rear seat expansion valve 23 is a temperature type expansion valve that automatically adjusts the valve opening so as to maintain the refrigerant superheat degree at the outlet of the rear seat evaporator 6 at a predetermined value. The rear seat air conditioning unit 13 includes a rear seat blower 24 that blows the inside air or the outside air to the rear seat evaporator 6. The rear seat blower 24 is an electrically driven electric blower.

The rear seat blower 24, the rear seat evaporator 6 and the rear seat expansion valve 23 are provided inside the rear seat case 22. The rear seat evaporator 6 is disposed downstream of the rear seat blower 24 in the rear seat case 22. The inlet side of the rear seat expansion valve 23 is connected to the inlet side of the front seat expansion valve 15 via the underfloor high-pressure pipe 25. On the other hand, the outlet side of the rear seat evaporator 6 is connected to the outlet side of the front seat evaporator 5 via the underfloor low-pressure pipe 26.

The underfloor high-pressure pipe 25 and the underfloor low-pressure pipe 26 are provided in an underfloor space 27 formed below the floor surface 3 of the passenger compartment 2. Further, the underfloor high-pressure pipe 25 and the underfloor low-pressure pipe 26 are arranged at a position lower than the suction pipe 28 of the compressor 9 by a predetermined dimension L. In the present embodiment, the predetermined dimension L is about 600 mm.

The rear seat air conditioning unit 13 includes a rear seat heater core 29 that heats the conditioned air with hot water from the vehicle engine on the downstream side of the rear seat evaporator 6 in the rear seat case 22. A bypass path 30 is formed on the side of the rear seat heater core 29 in the rear seat case 22.

The rear seat air conditioning unit 13 is a plate that adjusts the air flow rate ratio between the warm air heated through the rear seat heater core 29 and the cold air passing through the bypass passage 30 according to the rotation position to adjust the blown air temperature. A rear seat air mix door 31 is provided. The rear seat air mix door 31 is provided adjacent to the rear seat heater core 29.

A rear seat face opening 31a is provided immediately downstream of the rear seat evaporator 6 of the rear seat case 22. The rear seat face opening 31a includes a rear seat face duct 31d. The rear seat face duct 31d has a rear seat face introduction port (same as the rear seat face opening 31a) for introducing the cool air cooled by the rear seat evaporator 6, and the introduced cool air is directed toward the head of the rear seat occupant. And has a ceiling outlet 31b.

On the other hand, a rear seat foot opening is provided on the downstream side of the rear seat heater core 29 of the rear seat case 22. The rear seat foot opening includes a rear seat foot duct. The rear seat foot duct has a rear seat foot inlet for introducing warm air heated by the rear seat heater core 29 and a rear seat foot outlet 31c for blowing the introduced warm air toward the feet of the rear seat occupant. is doing.

The opening provided for blowing the conditioned air to the rear seat is only these two rear seat foot outlets 31c and the ceiling outlet 31b. A rear seat mode door is provided at the rear seat foot outlet 31c and the ceiling outlet 31b. The rear seat mode door is a rear seat face door and a rear seat foot door. These two mode doors (rear seat face door and rear seat foot door) are controlled to open and close in accordance with the rear seat blowing mode. The rear seat face door opens and closes the rear seat face introduction port. The rear seat foot door opens and closes the rear seat foot inlet.

A dedicated evaporator 7 is provided in the vehicular refrigerator 4 that is an example of a limited space air-conditioning unit that stores and cools beverages or the like in a space inside the limited space. The vehicular refrigerator 4 includes a limited space expansion valve 32 that expands the liquid-phase refrigerant flowing out of the liquid receiver 11 to a low temperature and a low pressure. The limited space expansion valve 32 is a temperature type expansion valve that automatically adjusts the valve opening so as to maintain the refrigerant superheat degree at the outlet of the dedicated evaporator 7 at a predetermined value. The vehicle refrigerator 4 includes a limited space blower 33 that blows air to the dedicated evaporator 7. The limited space blower 33 is an electrically driven electric blower.

The limited space blower 33, the dedicated evaporator 7, and the limited space expansion valve 32 are provided inside the heat insulating case of the vehicular refrigerator 4. Further, the inlet side of the limited space expansion valve 32 is connected to the inlet side of the front seat expansion valve 15 via the underfloor high-pressure pipe 25. On the other hand, the outlet side of the dedicated evaporator 7 is connected to the outlet side of the front seat evaporator 5 via the underfloor low-pressure pipe 26.

Next, in FIG. 2, the refrigerant discharged from the compressor 9 branches and flows through the condenser 10 toward the front seat evaporator 5, the rear seat evaporator 6, and the dedicated evaporator 7. Even when an independent operation of only 7 is required, the refrigerant flows through the front seat evaporator 5 and the rear seat evaporator 6. Thereby, even if there is no control valve capable of individually blocking the refrigerant flow in the parallel refrigerant flow paths, it is necessary to enable only the fake dedicated evaporator 7 to operate independently. At this time, a vehicle air conditioner that can reduce the cost by omitting the control valve by blowing the conditioned air that has passed through the front seat evaporator 5 or the rear seat evaporator 6 into the passenger compartment 2 and without causing window fogging. It is composed.

In FIG. 2, it is easy to operate the

evaporators

5, 6, 7 in all the air conditioning units and to stop the dedicated evaporator 7 by closing the electromagnetic valve unit of the limited space expansion valve 32. However, since there is no control valve, it is difficult to operate by any one of the

evaporators

5, 6, and 7 in all the air conditioning units.

In addition, the air conditioner includes the air conditioning control device 40 shown in FIGS. 2 and 3. The air conditioning control device 40 includes a microcomputer and peripheral circuits. The air conditioning control device 40 performs predetermined arithmetic processing according to a preset program, outputs a control signal, and controls the air conditioning equipment.

The air conditioning control device 40 is connected to a front seat operation panel 42 provided with various sensors and a display unit 41, a rear seat operation panel 43, and front seat equipment, rear seat equipment, and limited space air conditioning equipment related equipment. . The front seat evaporator temperature sensor 18 (FIGS. 1 and 3) detects the front seat evaporator outlet air temperature Te and outputs it to the air conditioning control device 40.

In addition, the outside air sensor 44 that detects the outside air temperature Tam that is the temperature of the air outside the vehicle interior, the inside air sensor 45 that detects the room temperature Tr, the solar radiation sensor 46, and the water temperature sensor 47 are respectively the outside air temperature Tam, The inside air temperature Tr, the solar radiation amount Ts, and the hot water temperature Tw are detected and output to the air conditioning control device 40.

Also, a limited space temperature sensor 48 that detects a limited space temperature Tc that detects the internal temperature of the refrigerator 4 for the vehicle is connected to the air conditioning control device 40.

The front seat operation panel 42 is provided with a front seat operation section that performs operations for setting the temperature in the passenger compartment 2, adjusting the air volume, switching between the inside and outside air modes, and switching the blow-out mode. An air conditioner switch (not shown), a first air conditioning unit (front seat air conditioning unit) operation switch, a second air conditioning unit (rear seat air conditioning unit) operation switch, and the like are provided in a part of the front seat operation unit. The operation unit of the vehicular refrigerator 4 is in the door of the vehicular refrigerator 4, but may be in the front seat operation panel 42 or the rear seat operation panel 43.

The operating states of the front seat air-conditioning unit 12, the vehicle refrigerator 4, and the rear seat air-conditioning unit 13 have two states: an operating state that is a driving state and a stopped state that is a stopped state. The operating state includes, for example, a state where a defrosting operation is performed.

The front seat operation panel 42 outputs a front seat operation signal input from the front seat operation unit and the air conditioner switch to the air conditioning control device 40. On the other hand, the rear seat operation panel 43 includes a rear seat operation section (not shown) that performs operations for adjusting the air volume of the rear seat, switching the rear seat inside / outside air mode, and switching the rear seat blowing mode. The rear seat operation panel 43 outputs the rear seat operation signal input by the rear seat operation unit to the air conditioning control device 40.

As each air conditioner of the front seat air conditioning unit 12, the vehicle refrigerator 4, and the rear seat air conditioning unit 13, the limited space blower 33 that blows air to the dedicated evaporator 7 in the vehicle refrigerator 4, the electromagnetic clutch 8, the front seat Blower 16, front seat switching door (not shown), front seat air mix door 21, front seat mode door, rear seat blower 24, rear air inlet (not shown) and rear air inlet (not shown) It includes motor-using devices such as a door, a rear seat air mix door 31, and a rear seat mode door.

The air conditioning control device 40 performs predetermined arithmetic processing on the motor-using equipment M of these air conditioning equipment and outputs a control signal as shown in FIG. 3 to control these air conditioning equipment. Furthermore, the air conditioning control device 40 includes an oil return control unit 50 that collects the retained lubricating oil.

The oil return control unit 50 can be introduced or used by referring to Patent Document 1. Therefore, only the outline of the oil return control unit 50 will be described. The oil return control unit 50 includes a timer T, a detection unit 51, a determination unit 52, a first control unit 53, and a second control unit 54. The detection unit 51 detects the operating state of the compressor 9, the operating state of the front seat blower 16, the operating state of the rear seat blower 24, the operating state of the timer T, and its count value.

The determination unit 52 determines whether or not these operating states and count values detected by the detection unit 51 require oil return control. The first control unit 53 controls the rear seat face door and the rear seat foot door to be closed.

The closed state here means that the rear seat face door and the rear seat foot door are closed without a gap, or the occupant seated in the rear seat is uncomfortable even if the blown air leaks through the gap between the rear seat blowing mode doors. To the extent you cannot feel it. The second control unit 54 controls the rear seat blower 24 to the operating state for a predetermined time Tn stored in the memory.

As shown in FIGS. 1 and 2, the air conditioner includes a front seat air conditioning unit 12, a vehicle refrigerator 4, and a rear seat air conditioning unit 13 that include a case in which an opening that provides conditioned air to the vehicle interior is formed. The front-seat evaporator 5 provided in the front-seat air conditioning unit 12, the dedicated evaporator 7 in the vehicular refrigerator 4, and the rear-seat evaporator 6 provided in the rear-seat air-conditioning unit 13 are connected in parallel to the compressor 9. With a refrigeration cycle.

In addition, the air conditioning control that closes all the

openings

13a, 13b, 13c, 31b, and 31c for sending the conditioned air to the passenger compartment 2 and applies the intermittent heat load to the front seat evaporator 5 to allow the refrigerant flow. A device 40 is provided. As a result, a heat load is applied to the front-seat evaporator 5 provided in the stopped front-seat air conditioning unit 12, and the refrigerant flow is allowed. As a result, it is possible to return the compressor lubricating oil staying in the front seat evaporator 12 and the piping bypassing the rear seat evaporator 6 to the compressor 9 side.

And since the air-conditioning control apparatus 40 has made all the

opening parts

13a, 13b, 13c, 31b, and 31c which send an air-conditioning wind into the vehicle interior 2 into a closed state, the front seat evaporator 5 is intermittently provided in an oil return operation. The influence of the heat load on the vehicle interior 2 does not reach the vehicle interior 2. Therefore, it becomes possible to suppress the discomfort of the passenger in the air-conditioned space.

During the oil return operation, the air conditioning control device 40 applies a heat load to the front seat evaporator 5 by the front seat blower 16 that blows air to the front seat evaporator 5, and is a temperature-type expansion valve. 15, the refrigerant flow is allowed to be allowed intermittently. Thereby, a heat load is given to the front seat evaporator 5 by the air blown from the front seat blower 16. The refrigerant whose temperature rises due to the heat load opens the front seat expansion valve 15 which is a temperature type expansion valve. As a result, the front seat air conditioning unit 12 is in an operating state, and the air conditioning control device 40 can execute oil return control. Further, the air conditioning control device 40 closes all the

openings

13a, 13b, 13c, 31b, 31c after the stop state of the front seat air conditioning unit 12 and the operation state of the rear seat air conditioning unit 13 have continued for a predetermined time. Then, a heat load is applied to the front seat evaporator 5 to allow the refrigerant to flow.

If the rear seat air-conditioning unit 13 is continuously operated for a predetermined time, the lubricating oil for the compressor tends to stay in the front seat evaporator 5 and the pipe bypassing the rear seat evaporator 6. As a result, it is necessary to control the retained lubricating oil to be effectively returned to the compressor 9 side.

The set voltage Vn applied to the rear seat blower 24 during the oil return control is set to a value between the starting voltage that can drive the rear seat blower 24 and the minimum set voltage during normal operation. The air blown by the rear-seat blower 24 passes through the rear-seat evaporator 6 and is then exhausted into a trim (not shown) (interior such as sheet fabric, carpet, lining, or the like) or exhausted from a drain hose (not shown) to the outside of the vehicle. .

Next, the operation of the vehicle air conditioner in the first embodiment will be described. In the front seat air-conditioning unit 12 (FIG. 1) during operation, after the inside air or the outside air is selected by the front seat switching door, the air blown by the front seat blower 16 is cooled and dehumidified by the front seat evaporator 5.

Then, it is reheated by the front seat heater core 19. Here, the air volume ratio of the cool air and the warm air is arbitrarily adjusted by the front seat air mix door 21 to adjust the temperature at which air is blown out to the front seat. And according to blowing mode, conditioned air is blown out from each opening part to the vehicle interior 2 to a front seat.

On the other hand, in the rear seat air conditioning unit 13 during operation, after the inside air or the outside air is selected by the rear seat switching door, the air blown by the rear seat blower 24 is cooled and dehumidified by the rear seat evaporator 6. Thereafter, reheating is performed by the rear seat heater core 29. Further, the rear seat air conditioning unit 13 switches the blowing mode to the face mode or the foot mode by the rear seat mode door.

In the face mode, the cool air that has been cooled and dehumidified by the rear seat evaporator 6 is blown out from the ceiling outlet 31b to the head of the rear seat occupant through the rear seat face duct 31d. In the foot mode, after the blown air passes through the rear seat evaporator 6, the warm air heated by the rear seat heater core 29 is passed through the rear seat foot duct from the rear seat foot outlet 31 c to the foot portion of the rear seat occupant. Blow out.

When the front seat air conditioning unit 12 and the rear seat air conditioning unit 13 are simultaneously operated as described above, the opening degree of the front seat expansion valve 15 is adjusted by the front seat expansion valve 15 by the front seat expansion valve 15. The opening is adjusted to correspond to the heat load. Further, the opening degree of the rear seat expansion valve 23 is adjusted by the rear seat expansion valve 23 to an opening degree corresponding to the thermal load of the rear seat evaporator 6. That is, the

expansion valves

15 and 23 can adjust the flow rate of the refrigerant flowing into the

evaporators

5 and 6 to a flow rate corresponding to the heat load.

When the

air conditioning units

12 and 13 are in an operating state, the refrigerant is always flowing. However, when an occupant is only in the front seat and no occupant is in the rear seat, the rear seat blower 24 is stopped by a switch operation on the rear seat operation panel 43. Thus, no air is blown to the rear seat evaporator 6 and the air conditioning operation of the rear seat air conditioning unit 13 is stopped, so that only the front seat air conditioning unit 12 is operated.

During this front seat independent operation, the rear seat expansion valve 23 repeats minute opening and closing. Thereby, the liquid-phase lubricating oil is accumulated in the rear seat evaporator 6, the underfloor high-pressure pipe 25, and the underfloor low-pressure pipe 26. Therefore, oil return control is performed on the rear seat air-conditioning unit 13 when stopped, and the lubricating oil is recovered to the compressor 9.

In the oil return control, a heat load is applied to the rear-seat evaporator 6 that is stopped by blowing air to the rear-seat evaporator 6. Then, the rear seat expansion valve 23 is opened, and the refrigerant flows through the rear seat evaporator 6. Accordingly, it is possible to return the lubricating oil for the compressor in the rear seat evaporator 6, the underfloor high-pressure pipe 25, and the underfloor low-pressure pipe 26 that stays while the rear seat air-conditioning unit 13 is stopped to the compressor 9 side. Become.

In addition, the air-conditioning control device 40 always controls the rear seat blower 24 to the operating state after all the rear seat mode doors are closed. Thereby, the air blown from the rear seat blower 24 does not leak into the vehicle interior 2. Therefore, it is possible to perform control that suppresses passenger discomfort.

Next, the independent operation of the vehicle refrigerator will be described. In the refrigerant circuit in which the refrigerant flows into the

evaporators

5, 6, 7 in parallel as shown in FIG. 2, if the control valve in each parallel flow path is omitted, the

evaporators

5, 6 are connected even when the vehicle refrigerator 4 is operated alone. The refrigerant will flow. Therefore, in the single operation of the vehicle refrigerator 4 which is an example of the limited space air conditioning unit, a small amount of air is also sent to the evaporators 5 and 6 (or only the evaporator 5) other than the dedicated evaporator 7 in the vehicle refrigerator 4. The occupant blows only the air volume based on a predetermined isolated operation air volume Vn (air volume when the limited space air-conditioning unit is operated independently), which is a minute amount that does not give a sense of incongruity to the independent operation of the vehicular refrigerator. Blow out. The single operation air volume Vn is preset and stored in a memory in the air conditioning control device 40. The independent operation air volume Vn may be different from the air volume Vn at the time of oil return control.

It also solves window fogging by blowing it out towards the window 1w. Further, when the air is blown out to the window 1w, the outside haze is further eliminated by raising the blowing temperature and blowing it out. Thereby, window fogging can be prevented while performing control that makes it appear as if only the vehicle refrigerator 4 is operating.

When the independent operation control of the vehicular refrigerator 4 is an independent operation of only the vehicular refrigerator 4, the front seat air conditioner 12 that forms the front seat air conditioner has a minimum air volume in the differential mode (the air volume of the blower voltage Vn, simply the air volume Vn. The target blowout temperature is limited so that the blowout temperature does not become lower than the outside air temperature.

At this time, all the operation displays of the front seat air conditioning unit 12 and the rear seat air conditioning unit 13 in the display unit 41 in the front seat operation panel 42 are turned off (the display is turned off to make it appear not to operate). With this display off, it is possible to make it appear that the occupant is hardly aware of the operation of the front seat air conditioning unit 12 and the rear seat air conditioning unit 13 and is operating only the vehicle refrigerator 4 alone. Accordingly, it becomes difficult for the passenger to notice the operation of the front seat air conditioning unit 12 and the rear seat air conditioning unit 13, and the inside of the vehicle refrigerator 4 can continue to operate while being refrigerated.

The operation and effect of the first embodiment will be described. In the first embodiment, the front seat air conditioning unit 12 that is provided at one location in the vehicle interior 2 and blows the conditioned air from the front seat evaporator 5, and the rear seat is provided at the other location in the vehicle interior 2. Rear seat air-conditioning unit 13 that blows conditioned air from the seat evaporator 6, a vehicle refrigerator 4 that cools the interior space 4a, which is a locally limited space, by the dedicated evaporator 7, and the front seat And a compressor 9 for pumping the refrigerant to the rear-

seat evaporators

5 and 6 and the dedicated evaporator 7. Then, when the vehicle refrigerator independent operation for cooling only the inside of the vehicle refrigerator 4 is set by the dedicated evaporator 7 of the vehicle refrigerator 4, the conditioned air that has passed through the front seat evaporator 5 or the rear seat evaporator 6 is set. Is blown into the passenger compartment 2.

According to this, when the vehicle refrigerator 4 is switched to the single operation, the conditioned air that has passed through the front-seat evaporator 5 or the rear-seat evaporator 6 despite the single operation of the vehicle refrigerator 4 Since the air is blown to 2, fogging of the window 1w in the vehicle interior 2 can be suppressed.

In addition, when the conditioned air that has passed through the front seat evaporator 5 or the rear seat evaporator 6 is blown into the vehicle interior 2, the air is blown at a preset air volume based on the single operation air volume Vn of the vehicle refrigerator 4. According to this, it is as if the vehicle refrigerator 4 is operated alone, and window fogging in the passenger compartment 2 can be suppressed with a reduced air volume that feels that the front seat air conditioning unit 12 and the rear seat air conditioning unit 13 are not operating. .

Furthermore, the conditioned air that has passed through the front seat evaporator 5 is blown toward the window 1w in the differential mode with the air volume based on the single operation air volume Vn of the vehicle refrigerator 4 preset in the vehicle interior 2. According to this, since the air is blown toward the window 1w in the differential mode, it is possible to reliably suppress the window fogging.

In addition, the air flow with the air volume based on the preset independent operation air volume Vn of the vehicular refrigerator 4 is blown at a temperature equal to or higher than the outdoor temperature Tam which is the outdoor temperature. According to this, since the air is blown toward the window 1w in the differential mode and the blowout temperature is controlled so as not to be lower than the outside air temperature Tam, the fogging of the window can be more reliably suppressed.

Next, a display unit 41 for displaying the operating state of the front seat air conditioning unit 12 or the rear seat air conditioning unit 13 is provided, and the front seat air conditioning unit 12 or the rear seat air conditioning unit 13 in the display unit 41 when the vehicle refrigerator 4 is operated independently. The operation display is displayed as inactive even though the front seat air conditioning unit 12 or the rear seat air conditioning unit 13 is operating. Specifically, the operation status display of the blower, the opening / closing status display of the air outlet, and the like are turned off.

According to this, when the vehicle refrigerator 4 is operated alone, it is displayed as inactive despite the front seat air conditioning unit 12 or the rear seat air conditioning unit 13 being operated. It can be emphasized that it is driving.

Further, when the refrigerant discharged from the compressor 9 branches and flows through the front seat evaporator 5, the rear seat evaporator 6, and the dedicated evaporator 7, and the independent operation of only the dedicated evaporator 7 is required, The refrigerant flows through the seat evaporator 5 and the rear seat evaporator 6. Then, the conditioned air that has passed through the front seat evaporator 5 or the rear seat evaporator 6 is blown into the passenger compartment 2 to the extent that there is no discomfort to the passenger. According to this, even if there is no control valve capable of individually blocking the refrigerant flow in the parallel

refrigerant flow paths

5p, 6p, 7p, it is possible to operate only the dedicated evaporator 7 as a fake and the inside of the passenger compartment 2 Further, since the conditioned air that has passed through the front-seat evaporator 5 or the rear-seat evaporator 6 is blown out, there is no window fogging, and an air conditioner that can reduce costs by omitting the control valve can be provided.

Further, the first air conditioning unit is composed of a front seat air conditioning unit 12 in the vehicle, the second air conditioning unit is composed of a rear seat air conditioning unit 13 in the vehicle, and the limited space air conditioning unit is composed of a vehicle refrigerator 4. According to this, when the vehicle refrigerator 4 is switched to the single operation, the conditioned air that has passed through the front-seat evaporator 5 or the rear-seat evaporator 6 despite the single operation of the vehicle refrigerator 4 Since the air is blown to 2, fogging of the window 1w in the vehicle compartment 2 can be suppressed.
(Second Embodiment)
Next, a second embodiment of the present disclosure will be described. In the following embodiments, the same components as those in the first embodiment described above are denoted by the same reference numerals, description thereof will be omitted, and different configurations and features will be described. FIG. 4 illustrates a vehicle air conditioner having a cycle with an ejector as a second embodiment of the present disclosure. In the cycle with an ejector of the present embodiment, the discharge side of the compressor 9 → the condenser 10 constituting the radiator → the front seat expansion valve 15 (flow rate control valve) → the ejector 15 x → the front seat evaporator 5 → the suction side of the compressor 9. The main refrigerant circulation path leading to is provided.

The condenser 10 cools the high-pressure refrigerant by exchanging heat between the high-pressure refrigerant discharged from the compressor 9 and outside air (air outside the passenger compartment) blown by a cooling fan (not shown). In the present embodiment, the condenser 10 as the condenser 10, the gas-liquid separator that separates the gas-liquid refrigerant condensed in the condenser, and the liquid-phase refrigerant separated by the gas-liquid separator are supercooled. A condenser with an integrated supercooling section is used.

The ejector 15x is a depressurizing unit that depressurizes the fluid and is a momentum transporting pump that transports the fluid by the entrainment action of the working fluid ejected at high speed. The ejector 15x is arranged in the same space as the nozzle portion 15xn for reducing the passage area of the refrigerant flowing in from the front seat expansion valve 15 and expanding the refrigerant in an isentropic manner, and the refrigerant outlet of the nozzle portion 15xn. A refrigerant suction port 15 s for sucking the gas-phase refrigerant from the dedicated evaporator 7 in the vehicular refrigerator 4 is provided.

Furthermore, a diffuser portion 15xd that constitutes a pressure increasing portion is disposed at the downstream side of the refrigerant flow of the nozzle portion 15xn and the suction port 15s. The diffuser portion 15xd is formed in a shape that gradually increases the refrigerant passage area, and acts to decelerate the refrigerant flow to increase the refrigerant pressure, that is, to convert the velocity energy of the refrigerant into pressure energy.

The refrigerant that has flowed out of the diffuser portion 15xd of the ejector 15x flows into the front seat evaporator 5. The front seat evaporator 5 is installed in the ventilation path of the front seat air-conditioning unit 12 and performs the cooling action of the front seat area.

Specifically, the conditioned air in the front seat is blown to the front seat evaporator 5 by the front seat blower 16 of the front seat air conditioning unit 12, and the low-pressure refrigerant decompressed by the ejector 15 x becomes the front seat evaporator 5 in the front seat evaporator 5. By absorbing heat from the conditioned air and evaporating, the conditioned air in the front seat is cooled and exhibits cooling capacity. The gas-phase refrigerant evaporated in the front seat evaporator 5 is sucked into the compressor 9 and circulates again through the main refrigerant circulation path.

In the main refrigerant circulation path,

branch passages

5p, 6p, and 7p branched into three at the outlet of the condenser 10 are provided. The passage 7p is a refrigerant passage from the outlet portion of the condenser 10 to the refrigerant suction port 15s of the ejector 15x. The passage 7p includes an electromagnetic valve portion and a throttle mechanism from the upstream side to the downstream side of the refrigerant flow. The limited space expansion valve 32 and the dedicated evaporator 7 are arranged in series. The electromagnetic valve portion of the limited space expansion valve 32 forms an open / close valve that blocks the refrigerant flow in the passage 7p. The throttle mechanism reduces the high-pressure liquid refrigerant at the outlet of the condenser 10 to a low-temperature and low-pressure gas-liquid two-phase refrigerant and adjusts the refrigerant flow rate of the dedicated evaporator 7.

The dedicated evaporator 7 is disposed in the vehicular refrigerator 4 and cools the blown air (inside air) of the limited space blower 33 for the refrigerator. In the present example, a fixed throttle is used as the throttle mechanism because the fluctuating heat load of the refrigerator is small. Of course, an appropriate variable aperture may be used as the aperture mechanism. The electromagnetic valve and the throttle mechanism of the limited space expansion valve 32 are configured as one integral part, but may be separate.

The passage 6p is a refrigerant passage from the outlet of the condenser 10 to the suction side of the compressor 9, and the passage 6p includes the rear seat expansion valve 23 and the rear seat from the upstream side to the downstream side of the refrigerant flow. The evaporator 6 is arrange | positioned in series. Here, the rear seat evaporator 6 is installed in the ventilation path of the rear seat air conditioning unit 13 and cools the rear seat area.

Specifically, the rear seat air blower 24 blows the rear seat air conditioned air to the rear seat evaporator 6, and the low pressure refrigerant decompressed by the rear seat expansion valve 23 is fed into the rear seat evaporator 6. By absorbing heat from the conditioned air in the rear seat and evaporating, the conditioned air in the rear seat is cooled and exhibits cooling capacity. As the rear seat expansion valve 23, in this example, a temperature type expansion valve that adjusts the valve opening degree so as to adjust the refrigerant flow rate so that the degree of superheat of the outlet refrigerant of the rear seat evaporator 6 becomes a predetermined value is used.

The effect of 2nd Embodiment is demonstrated. In the second embodiment, the ejector 15x is provided upstream of the refrigerant flow of the front seat evaporator 5, and the refrigerant that has passed through the dedicated evaporator 7 passes through the front seat evaporator 5 via the refrigerant suction port 15s of the ejector 15x. Flowing. According to this, even in the refrigeration cycle using the ejector 15x, even if there is no control valve capable of individually blocking the refrigerant flow in all of the

refrigerant flow paths

5p, 6p, 7p that flow in a diverted manner, the fake dedicated evaporator 7 Alone, and the conditioned air that has passed through the front-seat evaporator 5 or the rear evaporator 6 is blown into the passenger compartment, so there is no window fogging, and the cost can be reduced by omitting the control valve.
(Other embodiments)
In the above embodiment, the set voltage Vn applied to the rear seat blower 24 during the oil return operation is set to a value between the starting voltage that can drive the rear seat blower 24 and the minimum set voltage during normal operation. However, the rear seat blowing mode is set to the fully closed mode by the first controller 50c. Therefore, the air flow rate Vn may be an air flow rate that does not make the passenger sitting in the rear seat feel uncomfortable even if the blown air leaks from the gap between the rear seat blowing mode doors.

In addition, the independent operation air volume that is the air volume of the conditioned air that passes through the

evaporator

5 or 6 during the independent operation of the vehicle refrigerator is also referred to as the air volume Vn. It is not necessary to set a value between that and the minimum set voltage during normal operation, and it is sufficient if the air volume is comfortable for the occupant. Moreover, it is not necessary to make it the same as the air volume Vn at the time of oil return control.

In the above embodiment, the rear seat air conditioner 13 is provided with the rear seat evaporator 6 and the rear seat heater core 29. However, the rear seat air conditioning unit 13 may have only a cooler function in which the rear seat heater core 29 is not provided.

Furthermore, in the said embodiment, the front seat air-conditioning part 12 and the rear seat air-conditioning part 13 are provided. However, it may have three or more air conditioning units. Furthermore, in the above embodiment, the present disclosure is used for a vehicle air conditioner. However, you may use for a domestic air conditioner or a commercial air conditioner.

In the home air conditioner, the air conditioner is provided in one room, which is one place in the room, and is provided in the other room, which is the other place in the room, and the first air conditioner that blows the conditioned air from the first evaporator. A second air conditioning unit that blows out conditioned air from the second evaporator, and a limited space air conditioning unit that cools the drying chamber of the bathroom, which is a locally limited space, with a dedicated evaporator. Moreover, the limited space air-conditioning part independent operation which is equipped with the compressor which pumps a refrigerant | coolant to the 1st and 2nd evaporator and an exclusive evaporator, and cools only the inside of a limited space air-conditioning part with the exclusive evaporator in a drying chamber was set. Sometimes, the conditioned air that has passed through the first evaporator or the second evaporator is slightly blown into the room.

According to this, when switching to the single operation of the drying chamber, the conditioned air that has passed through the first evaporator or the second evaporator is slightly blown into the room despite the single operation of the limited space air conditioning unit. , Indoor window fogging and dew generation can be suppressed.

Claims

A first air conditioner (12) including a first evaporator (5) provided at one place in the room (2) and blowing out the conditioned air that has passed through the first evaporator (5);
A second air conditioner (13) that includes a second evaporator (6) provided at the other location in the room (2) and blows out conditioned air that has passed through the second evaporator (6);
A third air conditioner (4) that includes a third evaporator (7) in a locally limited space (4a) and cools using the third evaporator (7);
A compressor (9) for pumping refrigerant to the first and second evaporators (5, 6) and the third evaporator (7),
When the single operation of the third air conditioner (4) for cooling only the limited space (4a) using the third evaporator (7) is set, the first air conditioner (12) or the first 2 An air conditioner in which the air conditioning unit (13) blows the conditioned air into the room (2).
At the time of the independent operation of the third air conditioning unit (4), the first air conditioning unit (12) or the second air conditioning unit (13) is configured so that the conditioned air flows into the room (2) in advance. The air conditioner according to claim 1, wherein the air is blown with an air volume based on Vn).
In the single operation of the third air conditioning unit (4), the first air conditioning unit (12) or the second air conditioning unit (13) blows the conditioned air toward the window (1w) in a differential mode. Item 3. The air conditioner according to item 1 or 2.
The temperature of the conditioned air blown into the room (2) in the independent operation of the third air conditioning unit (4) is equal to or higher than an outdoor temperature (Tam) that is an outdoor temperature. The air conditioner according to one item.
A display unit (41) for displaying an operating state of the first air conditioning unit (12) or the second air conditioning unit (13);
In the single operation of the third air-conditioning unit (4), the display unit (41) is arranged in spite of the operation of the first air-conditioning unit (12) or the second air-conditioning unit (13). The air conditioner according to any one of claims 1 to 4, wherein the first air conditioner (12) or the second air conditioner (13) is displayed so as to be inactive.
The refrigerant discharged from the compressor (9) branches and flows toward the first evaporator (5), the second evaporator (6), and the third evaporator (7),
The air conditioner according to any one of claims 1 to 5, wherein the refrigerant flows through the first evaporator (5) and the second evaporator (6) even during the single operation.
The first air conditioning unit (12) includes a front seat air conditioning unit in the vehicle, the second air conditioning unit (13) includes a rear seat air conditioning unit in the vehicle, and the third air conditioning unit (4) is for a vehicle. The air conditioner according to any one of claims 1 to 6, comprising a refrigerator.
An ejector (15x) is provided upstream of the refrigerant flow of the first evaporator (5);
The air conditioner according to claim 6, wherein the refrigerant that has passed through the third evaporator (7) flows through the first evaporator (5) through the refrigerant inlet (15s) of the ejector (15x).