JPS6015218A - Air conditioner for automobile - Google Patents

Abstract

PURPOSE:To increase chilling or heating performance of an air conditioner by setting an auxiliary vehicular room outside heat exchanger provided to a refrigerator in the discharge path of air in the vehicular room. CONSTITUTION:When a cooler is operated by the switch of an air conditioner, the inport 2A, outport 2B, in-out port 2C and outport 2D of a four-way valve 2 are connected, a refrigerant flows to the direction of the full line arrow, and chilling operation is made. When a heater is operated, the valve 2 is connected to the direction of the broken line, the refrigerant flows to the direction of broken line arrow, and heating operation is made. A heat is given to air sent in an indoor device 5 for front seat by discharged refrigerant from a compressor 1, the refrigerant is liquefied and adiabatically expanded in a decompressor 55, and the refrigerant heat-exchanges the open air of its heat in an outdoor device 3 and flows into an accumulator 7. When heating switch for the back seat is pushed then, a solenoid valve 63 is opened, the refrigerant is adiabatically expanded, vaporized by the heat of indoor air flowing to the outsude of the vehicular body in the exhaust hole 40 of an auxiliary outdoor device 4, joined with refrigerator in the flow path 13, and supplied to the outdoor device 3. The performance of the heat exchanger can thus be increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to increasing the opening capacity or heating capacity of an air conditioning system for an automatic FJJ equipped with a refrigeration system.

As an air conditioner for an automobile, there is a refrigerant compressor that is intermittently driven by the engine via an electromagnetic clutch, a condenser that is an indoor/outdoor heat exchanger (hereinafter referred to as the outdoor unit), and a liquid receiving i! 8? (receiver), pressure reduction device, heat exchanger on the inside of the vehicle (hereinafter referred to as indoor unit)] - A dedicated cooling device using a refrigeration device that is equipped with a vaporator and forms a closed cycle for refrigerant, or a compressor. , a four-way valve, an outdoor unit, a pressure reducing device, an indoor unit, and A4: A heating and cooling system using a heat pump type refrigeration system (hereinafter referred to as pump to heat 1) equipped with a combulator. Conventionally, this type of In an automobile air conditioner using a refrigeration system (1), the outdoor unit is installed in a place where it can easily come into contact with outside air, such as at the very front of the engine room, and the inside air of the vehicle (hereinafter referred to as inside air) cannot be used. However, except for a short period at the beginning of operation, the inside air is lower than the outside air during cooling, and higher than the outside air during heating. J1 air vents are installed in the conductor's bow to allow the outside air introduced through the outside air intakes to be exhausted smoothly, and are used in the car's air conditioner during cooling and heating. 43, where outside air is mainly introduced, a large amount of inside air is exhausted from the exhaust hole.

SUMMARY OF THE INVENTION An object of the present invention is to provide an air conditioner for an automobile that can improve the efficiency of a refrigeration system by effectively utilizing the inside air discharged from an inside air exhaust path or exhaust hole.

The automotive air conditioner of the present invention is an automotive air conditioner equipped with a refrigeration system comprising at least a refrigerant compressor, a single indoor heat exchanger, a pressure reducing device, and a vehicle exterior heat exchanger. The apparatus is provided with an auxiliary vehicle exterior heat exchanger, and the auxiliary vehicle exterior heat exchanger is disposed in a discharge path for air inside the vehicle.

With this configuration, the automotive air conditioner of the present invention can achieve the following effects.

b) During cooling operation, the cooling capacity can be increased because the refrigerant can be sufficiently condensed in the auxiliary outdoor unit.

During heating operation, the Ml ratio of the refrigerant in the auxiliary outdoor unit is high, so the heat exchange rate in the indoor unit increases and the heating capacity can be improved.

Therefore, the driving time of the compressor can be shortened, the engine output consumption by the compressor can be reduced, and the fuel consumption of the automobile can also be reduced.

Next, the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 is a block diagram of a heat pump, and FIG. 2 shows the arrangement of the heat pump when it is mounted on a passenger car.

A refrigerant compressor 1 is driven by the engine 100 via a J-shaped transmission bell h101, compresses the gas phase refrigerant sucked in from the suction port 1A, and discharges it from the discharge port 1B into the refrigerant flow path (hereinafter referred to as flow path) 11. 103 is the input pulley of the compressor 1
The electromagnetic clutch 2 provided in the flow path 105
1 to contact import 2A, in-out bow 1-2B
and a four-way valve 3, which is an electromagnetic switching valve equipped with a 2C1 outport 2D, is installed in front of the radiator 107 of the engine, and one end is connected to the flow path 12 communicating with the in-out port 2B of the four-way valve, and the other end 109 is an engine cooling fan that also serves as a fan of the outdoor unit 3 and a radiator fan; 4 is attached to the inside air exhaust path 40 provided in the rear part 111 of the passenger compartment 110 of the automobile. In this embodiment, one end is connected to a branch flow path 13A branched from the flow path 13,
The other end is connected to the flow path 14. 5 has one end connected to a branch flow path 13B branched from the flow path 13, and the other end connected to a branch flow path 15A of the flow path 15 connected to the inner 1-port 2G of the four-way valve 2. , a front seat indoor unit installed in the automobile air conditioner 50 installed in the front panel of the front of the vehicle compartment 110, 51 a blower for blowing air of the indoor unit 5, 53 and 55 the branch flow paths 13
The solenoid valve and pressure reducing device 6 inserted into B have one end connected to the flow path 14 communicating with the auxiliary outdoor unit 4, the other end connected to the flow path 153 branched from the flow path 15, and the other end connected to the flow path 153 branched from the flow path 15, 61 is a blower for blowing air for the rear seat indoor unit 6; Onibi 65 is the flow path 1
A solenoid valve and a pressure reducing device inserted in 4, 7 communicate with the four-way valve ARA 1 to BO H2D through a flow path 16, an import 7A, and an inlet port 1A of the compressor through a flow path 17. Equipped with out port 7B, compressor inlet 1A
This is an accumulator that prevents liquid phase refrigerant from being sucked into the compression III 1.

In this embodiment, as described above, the indoor unit is a so-called decoal type in which the front seat indoor unit 5 and the rear seat indoor unit 6 are arranged in parallel in the refrigerant flow path, and the auxiliary outdoor unit 4 is the front seat indoor unit 5. The machine frame 4 is arranged in parallel with the rear seat indoor unit 6, and has stays 41, 42, 43, 44 attached to both sides as shown in FIG.
The duct 4G is fitted into the inside of the duct 4G and fixed to the entrance of the inside air exhaust passage 40 constituted by the ducts 4G to 46 by being fastened to flanges 47 and 48 provided at both ends of the duct 4G.

This air conditioner for automobiles operates as follows6- do,.

The electromagnetic clutch 103 and the electromagnetic valve 53 are energized by operating a J air conditioner switch (not shown) provided in the driver's seat, and the clutch is engaged and the electromagnetic valve 53 is opened. As a result, the refrigerant compressor 1 is driven by one engine via the bells 1 to 101, and the compressed refrigerant is provided from the flow path 11 to the four-way valve.

Air: When switch 1 is set to cooler operation, four-way valve 2 is connected in the direction of the solid line shown in the figure, and invoice 1~
2Δ and Inara 1 are connected to boat 213 h<, and 20 is connected to Inara 1 to Inara 1 to Bo 1 to 2C, and refrigerant flows in the direction of the solid line arrow, and cooling operation is performed. First, the refrigerant is cooled and liquefied in the outdoor unit 3, and the pressure reducing device 55
The air is inflated adiabatically and supplied to the indoor unit 5 for the front seat. In the indoor unit 5 for the front seat (31), the air comes into contact with the air blown from the blower 51, and the air is cooled and vaporized at the same time, and flows into the Aki comb generator 7 via the four-way valve (1). Air is blown from the blower 51 cooled by the front seat indoor unit 5 through the ventilation outlet 120.
It is blown out into the vehicle compartment 110 from the air. f with Aki comb meter 7
, 1 gas-liquid portion η1 is made, and only the gas phase refrigerant is supplied to the compressor 1.

When the rear seat cooling switch (not shown) installed in the driver's seat is pressed, the solenoid valve 63 is also turned on, and the refrigerant is discharged from the cabin via the auxiliary outdoor unit 4 via the branch flow path 13△. It exchanges heat with the inside air that is discharged outside the vehicle through the air filter 40, obtains a degree of supercooling, is adiabatically expanded in the pressure reducing device 65, and is brought into contact with the air blown by the blower 61 in the rear seat indoor unit 6. When the kite is cooled η, it is vaporized in the same port 1 and merges with the refrigerant in the C flow path 15 through the flow path 15B. is blown out from the air outlet 121 into the vehicle compartment 110. At this time, the inside air is low compared to the outside air, except for the period after the start of the cooling operation.
This makes it possible to exchange a large amount of heat with any heat exchanger, and the general theory of refrigerants is sufficient.

When the L air conditioner switch is set to heater operation, the four-way valve 2 is connected in the direction of the broken line shown in the figure, and the inboard 2
When △ and in-out boat 2B and in-out boat 1-20 contact L, in-out boat 2B and in-out boat 1-20 communicate with each other, refrigerant flows in the direction of the dashed arrow, and heating operation is performed.

The 01 output refrigerant from the compressor 1 supplies heat to the blower 51 in the front seat indoor unit 5! It is then liquefied, depressurized (adiabatic expansion) by the pressure reducing device 55, vaporized by absorbing the heat of the outside air in the outdoor unit 3, and flowing into the Agicomb generator 7 via the four-way valve 2.At this time, the rear seat heating switch (Fig. (not shown), the solenoid valve 63 is also opened, the air is adiabatically expanded by the pressure reducing device 65, the exhaust hole 40 of the auxiliary outdoor unit 4 takes away the heat of the inside air flowing out of the middle room, and vaporizes the air. The refrigerant from 13B is combined and the outdoor unit 3
supplied to

Even in this case, since the inside air that comes into contact with the auxiliary outdoor unit 4 is considerably higher in temperature than normal outside air, a high heat exchange rate can be achieved with a compact heat exchanger.

In addition, in the example described in -1-, the rear seat car air conditioning design 6
Although the embodiment has been described in the case of a Decoal type equipped with 0, it goes without saying that the auxiliary outdoor unit 4 can be similarly applied to the case where the indoor unit is 9-.

FIG. 4 J3 and FIG. 5 show other embodiments of the present invention.

The same symbols as in FIGS. 1 and 2 indicate the same function.

In this embodiment, the refrigeration system is a cooling-only system, and the compressor 1
,] An outdoor unit 3, a no-ceiver 8, and an indoor unit 5 for the front seat, an indoor unit 6 for the rear seat, and an indoor unit 6 for the rear seat, which are vaporizers, respectively, are parallel to the flow path. It consists of an auxiliary outdoor unit 4, a solenoid valve 63, and a pressure reducing device 65 inserted in series upstream. The function of this air conditioner for automobiles is
This is almost the same as during the cooling operation of the embodiment shown in FIG. d3 and FIG. 2, and the refrigerant flows in the direction of the arrow during the cooling operation.

The Tagawa refrigerant from the compressor 1 is cooled in the outdoor unit 3, and only the liquid phase refrigerant is sent to the receiver 8 indoors 2! At +5, the vaporizer 1 "returns to the compressor 1. When the solenoid valve 63 is activated by pressing the operation switch of the rear seat automobile air conditioner," the blower 61 is driven to rotate. As a result, the liquid phase refrigerant is supplied from the receiver 10-8 to the auxiliary outdoor unit 4, and the auxiliary outdoor unit 4 obtains a sufficient degree of supercooling, and the pressure reducing device 65 expands the refrigerant during insulation, and the refrigerant is supplied to the rear seat indoor unit. 6, the air is evaporated and the air blown by the blower 61 is cooled. The vaporized refrigerant is sucked into the compressor 111, and the cooled air is blown out into the vehicle interior. Even at this time, heat is exchanged from the auxiliary outdoor unit 4 to the inner room whose temperature is lower than that of the outside air, so a large heat exchange rate can be achieved with a compact heat exchanger.

FIG. 6 shows a Mollier diagram of the cycle.

Point A on the diagram is the outlet of the receiver 8 or the pressure reducing device 55
The state of the entrance section is as follows. However, since the refrigerant at the entrance of the pressure reducing device 55 is further cooled by the auxiliary outdoor unit 4,
Take the supercooling degree SC and move to point B.

FIG. 7 shows the relationship between the degree of supercooling SC, the cooling capacity Q, and the coefficient of performance COP. By having a moderate degree of supercooling SC, the cooling capacity Q and the coefficient of performance COP are improved.

[Brief explanation of drawings]

Fig. 1 is a refrigerant circuit diagram of an air conditioner for an automobile according to an embodiment of the present invention, Fig. 2 is a diagram of its arrangement in a vehicle, and Fig. 3 is an installation state of an auxiliary vehicle outdoor heat exchanger. A perspective view illustrating the
FIG. 4 is a refrigerant circuit diagram of an air conditioning neck for an automobile according to an embodiment of the present invention, FIG. 5 is a diagram of its arrangement in a vehicle, and FIG.
The figure is a Mollier diagram of the cycle, and FIG. 7 is a graph showing the relationship between supercooling 1a and cooling capacity. In the diagram 1...Cold OI! Compression n2...Four-way valve 3...
・Vehicle outside heat exchanger 4...Auxiliary outside heat exchanger 5・
... Indoor heat exchanger for front seats 6 ... Middle indoor heat exchanger for rear seats 1 ... Accumulator 8 ... Receiver 4゜ ... Discharge hole Fig. 4 8 Fig. 5 □- --=-1 No. JP-A-Sho fin-15218 (6) Sixthly, FIG. 7 1, /10<H-4U! ! 63 C-τ1:1 1111 "One'-----" -9 Mh force immediate SC ('C)

Claims (1)

[Scope of Claims] 1) An air conditioner for an automobile equipped with a refrigeration system comprising a refrigerant compressor, a heat exchanger on the inside of the vehicle interior, a pressure reducing device, and a heat exchanger on the inside and outside of the vehicle, comprising: 1. An air conditioner for an automobile, characterized in that the device is provided with an auxiliary vehicle exterior heat exchanger, and the auxiliary vehicle exterior heat exchanger is disposed in a discharge path for air inside the vehicle.