JPH0660780B2 - Vehicle refrigeration equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a vehicle refrigerating machine, and more specifically to a freezing compartment, a refrigerating machine provided in the refrigerating room, and a defrosting of the refrigerating machine. BACKGROUND OF THE INVENTION 1. Field of the Invention

[Prior Art] Conventionally, in a vehicle refrigerating and refrigerating apparatus that cools a refrigerating compartment and a refrigerating compartment by one refrigerant supply means, for example, one compressor and a condenser, the freezing compartment is extremely low temperature (eg, -18 ° C or lower). In addition, the refrigerating room is at a medium temperature (for example, 0 to 10).
It is known to store and transport fresh foods, frozen foods, etc. in the freezing compartment and vegetables and the like in the refrigerating compartment for storage / transportation (for example, Jikho Sho 56-50362).

In the above-mentioned vehicle freezer-refrigerator, similar to a normal refrigerating machine, water in the air that has entered from the outside when the doors of the freezer compartment and the refrigerator compartment are opened and closed adheres to the evaporator of the cooling unit in each room as frost. . As a result, there occurs a problem that the cooling effect of each evaporator is reduced.
For this reason, conventionally, a process of temporarily flowing a warm refrigerant or the like to each of the evaporators for freezing and refrigerating to remove the attached frost has been performed.

[Problems to be Solved by the Invention] However, in general, the evaporator for refrigeration has a large amount of frost, and the evaporator for refrigeration has a small amount of frost. Therefore, the following problems have been considered in the vehicle refrigerating and refrigerating apparatus in which the warm refrigerant flows through the evaporators for freezing and refrigerating as described above. That is, (1) since the capacity of the power source of the vehicle or the like is limited, it is necessary to disperse the warm refrigerant into the evaporators for freezing and refrigerating in a defrosting manner for the evaporator for freezing with a large amount of frost. Takes too much time, which adversely affects the quality of fresh and frozen foods stored. Alternatively, the temperature of the refrigerating room rises more than necessary, re-cooling takes time, and the cooling efficiency of the refrigerating machine decreases.

(2) In order to avoid the problem of the above (1), if the freezing evaporator and the refrigerating evaporator have different defrosting timings, the refrigerating and refrigerating refrigerant supply means are one. Therefore, the other cooling must be stopped. As a result, there is a risk of adversely affecting stored products such as food in the freezer or the refrigerator.

Therefore, further improvement has been desired regarding defrosting of the vehicle refrigerating and refrigerating apparatus.

Configuration of the Invention [Means for Solving the Problems] The vehicle refrigeration system according to the present invention is configured as follows.

A refrigerating compartment cooling unit for cooling a refrigerating compartment, comprising one refrigerant supplying means for supplying a compressed / liquefied refrigerant, an expanding means and an evaporator in a path of the refrigerant supplied by the refrigerant supplying means, A refrigerating room cooling unit for a vehicle, comprising: an expansion unit and an evaporator connected in parallel to a refrigerant path of the room cooling unit; the refrigerating room cooling unit cooling the refrigerating room; Defrosting signal output means for outputting a defrosting signal when the defrosting condition of the cooling unit for cooling is satisfied, and when the defrosting signal output by the defrosting signal output means is received, the expansion means for freezing is arranged in parallel. The defrosting means for controlling the detour means provided in the defrosting means for directly supplying the refrigerant to the evaporator to defrost the evaporator for freezing, and the defrosting signal output by the defrosting signal output means. When digits,
The inflow of the refrigerant supplied to the refrigerating compartment cooling unit is blocked by a blocking means, and the air circulating means provided in the refrigerating compartment cooling unit is controlled to move the air in the refrigerating compartment to the refrigerating compartment. And a defrosting unit for refrigeration, which is circulated through a cooling unit to defrost the evaporator for refrigeration.

Here, the refrigerant supply means, to the cooling unit for the freezer compartment and the cooling unit for the refrigerating compartment, which are connected in parallel to the path of the refrigerant,
It is a means for supplying compressed and liquefied refrigerant, and is configured to include a compressor and a condenser driven by using a part of the output of the engine as a vehicle power source, or by using a dedicated engine. Various configurations such as a configuration for driving a compressor can be considered.

The expansion means may be any means as long as it expands the compressed / liquefied refrigerant, and it is conceivable to use an expansion valve or a fixed orifice, for example.

The defrosting signal output means outputs a defrosting signal when the defrosting conditions of the freezer compartment and the refrigerating room cooling unit are satisfied, and when both the defrosting conditions of both cooling units are satisfied, or It can be configured to output a defrosting signal when either one of them is satisfied. The establishment of such defrosting conditions means that after the cooling of the freezing compartment and the refrigerating compartment is started by the cooling unit for the freezing compartment and the refrigerating compartment, the evaporator for freezing and / or the frost of a predetermined amount or more on the evaporator for refrigerating adheres. By the passage of time, or by detecting that frost of a predetermined amount or more is attached to each or one of the evaporators by means for detecting the amount of frost formation, for example, an optical detection device or the like, further refrigeration The determination can be made by considering parameters such as the number of times of opening and closing the door of each of the compartment and the refrigerating compartment and the temperature.

The defrosting means for refrigeration means to defrost the evaporator of the cooling unit for the freezer compartment when receiving a defrosting signal.
The refrigerant is directly supplied to the evaporator by controlling the bypass means provided in parallel with the freezing expansion means. Here, the bypass means is realized by disposing an openable / closable valve in a bypass path bypassing the expansion means, or by a configuration in which a refrigerant passage is switched to a bypass path bypassing the expansion means by a three-port valve. You can

The defrosting means for refrigeration is for defrosting the evaporator of the refrigerating unit cooling unit when receiving a defrosting signal,
The cutoff means cuts off the supply of the refrigerant to the evaporator, and the air circulation means is controlled to circulate the air in the refrigerating compartment through the refrigerating compartment cooling unit. Here, the air circulation means can be configured using, for example, a blower that is provided in the refrigerating compartment cooling unit and circulates the cool air in the refrigerating compartment through the evaporator during cooling,
In addition, a configuration using compressed air by a compressor can be considered.

The above-mentioned freezing defrosting means and refrigerating defrosting means each use a contact of a relay driven by a defrosting signal output means or another signal, for example, a freezing intermittent operation (hereinafter, simply FI.
(Referred to as R), a discrete configuration for controlling the detouring means, the blocking means, and the air circulating means in combination with an FIR control signal or the like used at the time, or a configuration for integrally implementing both as a logical operation circuit using a microcomputer or the like. And so on.

[Operation] The vehicle refrigerating apparatus according to the present invention having the above-described configuration operates as follows.

The vehicle freezer-refrigerating apparatus of the present invention supplies the refrigerant compressed and liquefied by the refrigerant supply means to the freezing compartment and the refrigerating compartment cooling unit, respectively, and uses the refrigerant supplied to the freezing compartment and the refrigerating compartment cooling unit. Each works to cool the freezing compartment and the refrigerating compartment, but when the defrosting condition is satisfied, the defrosting signal output means outputs the defrosting signal to the freezing and refrigerating defrosting means, respectively. When receiving this defrost signal, the defrosting means for freezing
The detouring means is controlled so that the refrigerant is directly supplied to the freezing evaporator without passing through the freezing expansion means so as to defrost the freezing evaporator, and the refrigerating defrosting means controls the shut-off means to control the refrigerant. In addition to blocking the inflow to the refrigerating compartment cooling unit, the air circulating means is controlled to forcibly circulate the air in the refrigerating compartment to defrost the refrigerating evaporator. Thereby, during defrosting, the vehicle refrigerating / refrigerating apparatus of the present invention supplies the warm refrigerant supplied by the refrigerant supplying means only to the freezing chamber cooling unit to defrost the evaporator for refrigeration, and to cool the evaporator for refrigeration. It works like defrosting is done by means of air circulation.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a vehicle refrigerating / refrigerating apparatus according to an embodiment of the present invention, and FIG. 2 is an explanatory view showing a refrigerant flow during freezing and defrosting of the vehicle refrigerating / refrigerating apparatus according to the present embodiment. It is a figure.

The vehicle refrigerating / refrigerating apparatus of the present embodiment shown in FIGS. 1 and 2 is mounted on a refrigerating / refrigerating FC, and includes a refrigerating compartment A and a refrigerating compartment B.
Is equipped with a refrigerating unit 1 and a refrigerating unit 2 for cooling each. This freezing unit 1, refrigeration unit 2
The refrigerant supplied to each is supplied via a condenser unit 3 and a receiver 4 to a compressor 5 driven by an engine (not shown). It is composed of a condenser blower 8. The compressor 5 is connected or disconnected from the engine by the clutch CL.

The refrigeration path for supplying the refrigerant to the refrigeration unit 1 is provided with a refrigeration valve 10 in front of the refrigeration unit 1 and an accumulator 11 and a check valve 12 on the outlet side thereof. The freezing valve 10 is closed during a so-called refrigerating operation in which only the refrigerating compartment B is cooled. The accumulator 11 is for separating the refrigerant into liquid and gas and returning only the gas to the compressor 5, and the check valve 12 is for preventing the reverse flow of the refrigerant.

During the freezing operation, the freezing valve 10 is opened and the refrigerant flows into the freezing unit 1. This refrigeration unit 1 includes a defrost valve 14, a refrigeration evaporator 15, and a refrigeration blower 1 arranged in parallel with a known refrigeration expansion valve 13.
6, the refrigerant flows through the freezing expansion valve 13 and the freezing evaporator 15 to be expanded and vaporized during the freezing operation.

On the other hand, in the refrigerating path for supplying the refrigerant to the refrigerating unit 2,
A refrigeration valve 18 is provided in front of the refrigeration unit 2, and an FIR valve 19 used at the outlet side for freezing intermittent operation (hereinafter, simply referred to as FIR) is provided. Refrigeration valve 18
Is closed during a so-called freezing operation for cooling only the freezing compartment A or during defrosting (which will be described later in detail), and the FIR valve 19 is turned on / off at predetermined intervals during the freezing / refrigerating operation to reduce the back pressure. It is for adjusting and flowing a refrigerant into each of the refrigerating unit 1 and the refrigerating unit 2. The refrigerating unit 2 includes a refrigerating expansion valve 20, a refrigerating evaporator 21,
The refrigerating blower 22 and the refrigerating fan 22 are provided, and the refrigerant flows through the refrigerating expansion valve 20 and the refrigerating evaporator 21 to be expanded and vaporized during the refrigerating operation. In addition, the refrigeration car F
The control panel in the C operation room is provided with a freezing switch SW1 for starting the freezing operation, and a SW3 (not shown) for instructing the start of other defrosting of the refrigerating switch SW2 for starting the refrigerating operation. When the refrigerating operation is performed, or when it is determined that defrosting is necessary, the switch SW1, SW2, SW3 is used to perform the above processing.

Next, the flow of the refrigerant during freezing and refrigeration will be described with reference to FIG.

First, at the time of freezing and refrigeration, the low-temperature low-pressure gaseous refrigerant is compressed by the compressor 5 to become a high-temperature high-pressure gaseous refrigerant and sent to the condenser 7. The gaseous refrigerant is cooled by the condenser 7, becomes liquid, flows into the receiver 4, and is temporarily stored. The liquid refrigerant that has exited the receiver 4 flows into the freezing path and the refrigerating path after removing dust, water, etc. by a dryer or the like (not shown).

The high-temperature, high-pressure liquid refrigerant flowing into the refrigeration path via the refrigeration valve 10 is rapidly expanded by the refrigeration expansion valve 13, becomes a low-temperature, low-pressure mist, and flows into the refrigeration evaporator 15. The refrigerant flowing into the freezing evaporator 15 takes heat from the air on the surface of the freezing evaporator 15 (air in the freezing compartment A) and evaporates to become a gaseous refrigerant. The refrigerant discharged from the freezing evaporator 15 flows into the accumulator 11, is separated into liquid and gas, and only gas flows into the compressor 5 via the check valve 12.

Similarly, the high-temperature / high-pressure liquid refrigerant that has flowed into the refrigerating path via the refrigerating valve 18 is also rapidly expanded by the refrigerating expansion valve 20, becomes a low-temperature / low-pressure atomized state, and flows into the refrigerating evaporator 21 to cool the refrigerating evaporator 21. 21
Heat is taken from the surface air (air in the refrigerating room B) to evaporate and become a gaseous refrigerant, which flows into the compressor 5 via the FIR valve 19.

The freezing compartment A and the refrigerating compartment B are cooled by repeating the above operation. The air on the surface of the condenser 7 is exchanged with the air outside the refrigerating / refrigerating vehicle FC by the condenser blower 8, and the air on the surfaces of the evaporator 15 and the refrigerating evaporator 21 are respectively the refrigerating blower 16 and the refrigerating blower 22.
Thus, the freezing room A and the refrigerating room B are circulated to efficiently cool each room.

During defrosting, the condenser blower 8 and the freezing blower 16 are stopped, the refrigeration valve 18 is closed, the defrost valve 14 is opened, and the compressor 5 is operated. As a result, the high-temperature, high-pressure gaseous refrigerant in the compressor 5 is not sufficiently cooled by the condenser 7 and is sent to the refrigeration evaporator 15 alone via the defrost valve 14 as it is at high temperature and high pressure. As a result, the frozen evaporator 15 is defrosted. On the other hand, defrosting of the refrigerating evaporator 21 is performed by stopping the inflow of the refrigerant by the refrigerating valve 18 and forcibly circulating the air in the refrigerating compartment B by the refrigerating blower 22. This is because the temperature in the refrigerating compartment B is 0 ° to 10 ° C., so that the refrigerating evaporator 21 can be sufficiently defrosted only by circulating the indoor air.

Although the flow of the refrigerant has been described in the freezing / refrigerating operation,
It goes without saying that the flow of each refrigerant is the same during the freezing operation or the single operation during the refrigerating operation.

The configuration of the refrigerating and refrigerating cooling unit and the like has been described above centering on the flow of the refrigerant. However, the above-described valves and motors are configured by the combination of the FIR amplifier 30 and the literary sequence as shown in FIG. Driven and controlled. Therefore, the electrical configuration of the vehicle refrigerating and refrigerating apparatus of this embodiment will be described next, and the operation timing of each valve, motor and the like will be described in detail.

The vehicle refrigerator / refrigerator of this embodiment is equipped with a vehicle-mounted battery BA.
The FIR amplifier 30, which operates using T as a power source, operates by receiving this power source voltage at its terminals, and this FIR amplifier 3
Each relay 31, 32, 3 controlled and operated by 0
3, 34, 35, a defrosting tray 36 that operates when a defrosting instruction is received by the push button switch SW3, a refrigeration valve relay 37, and a refrigeration blower relay 3 that always operates during refrigeration operation.
8. Freezing thermostat TS1, refrigerating thermostat TS2, defrosting thermostat TS3, and fuse S that determine the end timing of the freezing operation, the refrigerating operation, and the defrosting operation
1, S2, S3, S4, etc. are provided.

First, the refrigeration switch SW2 connected to the power supply line is connected to the input terminal of the FIR amplifier 30 via the thermostat TS2, and the defrost valve relay 31, the FIR valve relay 32, and the magnet clutch relay, which are also connected to the power supply line respectively. 33, condenser blower relay 3
4 are input terminals of the FIR amplifier 30 ,.
It is connected to the. The refrigerating thermostat TS2 is provided in the refrigerating compartment B, and is turned off when the temperature becomes lower than a predetermined temperature (for example, 5 ° C.). The make contact 32 a of the FIR valve relay 32 is provided between the power supply line and the FIR valve 19 and the make contact 33 a of the magnet clutch relay 33.
Are provided between the power supply line and the clutch CL, and the make contact 31a of the defrost valve relay 31 is provided between the power supply line and the defrost valve 14 via the refrigeration switch SW1 and the condenser blower relay 34. Make contact 34a
Are respectively interposed between the power supply line and the condenser blower 8 via the fuse S3. The FIR amplifier 30 is a logical operation circuit having a timer function and the like, and its operation will be described later in detail.

On the other hand, the refrigeration switch SW also connected to the power line
1 is connected to the input terminal of the FIR amplifier, the input terminal of the FIR amplifier directly, the push button switch SW3, and the freezing valve 10 via the refrigeration thermostat TS1 and then via the refrigeration blower relay 35. Push button switch SW
3 is further connected to a defrost relay 36 and a refrigeration valve relay 37 via a defrost thermostat TS3.
Also, the make contact 36a of the defrost relay 36 is connected in parallel to the push button switch SW3.
a is connected to the input terminal of the FIR amplifier 30.
Further, the make contact 35a of the refrigeration blower relay 35 is provided between the refrigeration blower 16 and the power supply line via the fuse S4. In addition, the above-mentioned frozen thermostat TS1
Is provided in the freezer compartment A, and is turned off when the temperature becomes lower than a predetermined temperature (for example, −28 ° C.). The defrosting push button switch SW3 is pressed by the driver or the like when it is determined that defrosting should be performed. It works as a defrosting signal output means. The defrost thermostat TS3 is provided in the vicinity of the outlet pipe of the freezing evaporator 15 and is turned off when the temperature exceeds a predetermined temperature (for example, 5 ° C).

Further, the input terminal of the FIR amplifier 30 is connected to the refrigeration blower relay 38, and the refrigeration valve relay 3 is connected.
7 is connected to the refrigerating valve 18 via a break contact 37a.

The operation of the vehicle freezer-refrigerating apparatus of the present embodiment having the above configuration will be described with reference to the timing chart shown in FIG.

Now, assuming that only the refrigerating switch SW1 is turned on by the driver (timing chart SW1 in FIG. 4), the FIR clutch 30 causes the magnet clutch relay 33, the condenser blower relay 34, and the refrigeration blower relay 35 to operate. The ON state (the timing chart of FIG. 4 magnet clutch relay 33, the condenser blower relay 34, the refrigeration blower relay 35) is set, and the refrigeration valve 10, the clutch CL, the condenser blower 8 and the refrigeration blower 16 are each turned on by being supplied with power. At this time, the refrigeration valve 18, the FIR valve 19, the refrigeration blower 22
Is in the off state, and only the so-called freezing operation in which only the freezing compartment A is cooled is executed. When the freezer compartment A is cooled and the temperature of the freezer compartment becomes equal to or lower than the predetermined temperature -28 [deg.] C., the freezer thermostat TS2 is turned off, a so-called cold keeping operation is executed, and the freezer compartment A is kept at the predetermined temperature.

Subsequently, when the refrigerating switch SW2 is turned on (timing chart SW2 in FIG. 4), the refrigeration blower relay 38 is turned on (timing chart in FIG. 4, refrigeration blower relay 38) and the FIR amplifier 30 is turned on. Function, the FIR valve relay 32 is turned on and off at predetermined time intervals (timing chart F in FIG. 4).
IR valve relay 32). As a result, the refrigerant is also supplied to the refrigerating compartment B, and the so-called refrigerating / refrigerating operation in which the refrigerating compartment B is cooled together with the cooling of the freezing compartment A is executed. When the refrigerating room B is also cooled to a predetermined temperature of 5 ° C. or lower, the refrigerating thermostat TS2 works to perform the cold keeping operation.

Next, when the driver judges that it is time to defrost and depresses the defrost push button switch SW3 (FIG. 4, timing chart defrost push button switch SW3), the defrost relay 36 is in the ON state, and the refrigeration valve. The relays 36 and 37 are turned on (timing chart in FIG. 4) to the defrost relay 36 and the refrigeration valve relay 37), and the operation of the FIR amplifier 30 causes the defrost valve relay 31 and the FIR valve relay 32 to operate.
Are in the on state (FIG. 4 timing chart defrost valve relay FIR valve relay 32), condenser blower relay 34, refrigeration blower relay 35, refrigeration valve relay 3
7 is in an off state (condenser blower relay 34, refrigeration blower relay 35, refrigeration valve relay 37) in the timing chart of FIG. As a result, the warm refrigerant that is not cooled by the condenser blower 8 flows only into the freezing evaporator 15, and the freezing evaporator is rapidly defrosted.
On the other hand, the refrigerating blower 22 works to forcibly circulate the air in the refrigerating compartment B, so that the refrigerating evaporator 21 is also defrosted. This defrosting operation is performed when the surface temperature of the freezing evaporator 15 becomes 4 ° C. or higher.
When the defrosting thermostat TS3 provided in the unit is turned off (timing defrosting thermostat TS3 in FIG. 4), the process ends.

According to the vehicle freezer-refrigerator of the present embodiment described in detail above, at the time of defrosting, the refrigerating valve 18 is closed to supply the warm refrigerant only to the refrigerating evaporator 15 to defrost the refrigerating evaporator 15 and to perform refrigerating. Defrosting of the evaporator 21 is performed by forced circulation of air in the refrigerating compartment B by the refrigerating blower 22. As a result, the defrosting of the frozen evaporator 15 is performed in a short time, and fresh food, frozen food, etc. can be stored / transported without impairing the quality of the fresh food, frozen food, etc. loaded in the freezing compartment A. Has the effect. Further, since the temperature in the refrigerating room B does not rise more than necessary, it does not adversely affect the food and the like in the refrigerating room B, and it does not take extra time to recool the refrigerating room. It also has the effect of not lowering the cooling efficiency.

In this embodiment, the defrosting push-button switch SW3 is configured to be turned on by being pushed by a driver or the like, but it goes without saying that it may be configured to be turned on / off at predetermined intervals. Is. Further, when defrosting can be performed, at least when the freezing operation is performed, but it may be configured so that it can be performed only during the refrigeration operation.

EFFECTS OF THE INVENTION According to the vehicle refrigerating and refrigerating apparatus of the present invention, at the time of defrosting, the warm refrigerant is supplied only to the refrigerating evaporator having a large amount of frost, and the defrosting of the refrigerating evaporator is performed by using the air circulation means or the like. ing. Thereby, there is an extremely excellent effect that defrosting of the frozen evaporator can be performed in a short time. As a result, there is an effect that the stored products loaded in the freezing compartment, such as fresh food and frozen food, can be stored and transported without impairing the quality. Moreover, since the temperature in the refrigerating room does not rise more than necessary, it does not adversely affect the food etc. in the refrigerating room, and it does not take extra time to recool the refrigerating room, and the cooling efficiency is improved. Does not cause a decrease in

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing the configuration of a vehicle refrigerating / refrigerating apparatus according to an embodiment of the present invention, FIG. 2 is an explanatory diagram for explaining the flow of the refrigerant, and FIG. 3 is a relay control circuit diagram used for the control. FIG. 4 is a timing chart showing the control timing. 1 ... Refrigeration unit 2 ... Refrigeration unit 3 ... Condenser unit 4 ... Receiver 5 ... Compressor 8 ... Condenser blower 10 ... Refrigeration valve 11 ... Accumulator 12 ... Check valve 14 ... Defrost valve 16 ... Refrigeration blower 18 ... Refrigeration valve 19 ... FIR Valve 22 ... Refrigeration blower 30 ... FIR amplifier 31 ... Defrost valve relay 32 ... FIR valve relay 33 ... Magnet clutch relay 34 ... Capacitor blower relay 35 ... Refrigeration blower relay 36 ... Defrost relay 37 ... Refrigeration valve relay 38 ... Refrigeration blower relay A ... Freezer room B ... Refrigerator room BAT ... Battery CL ... Clutch FC ... Refrigerator / refrigerator vehicle SW1 ... Refrigerator switch SW2 ... Refrigerator switch SW3 ... Defrost push button switch TS1 ... Refrigerator thermostat TS2 ... Refrigerator thermostat TS3 ... Defrost thermostat S1, S2, S3, S4 ... Fuse

Claims (1)

[Claims] 1. Cooling for a freezer compartment for cooling a freezer compartment, comprising one refrigerant supply means for supplying a compressed / liquefied refrigerant, and an expansion means and an evaporator in a path of the refrigerant supplied by the refrigerant supply means. A refrigerating / cooling device for a vehicle, comprising: a unit; an expansion unit and an evaporator connected in parallel to a refrigerant path of the cooling unit for the freezing chamber; When the defrosting conditions of the refrigerating room and the refrigerating room cooling unit are satisfied, the defrosting signal output means for outputting a defrosting signal and the defrosting signal output by the defrosting signal output means are used for freezing. The defrosting means for defrosting the evaporator for freezing by controlling the bypass means provided in parallel with the expansion means and supplying the refrigerant directly to the evaporator, and the output of the defrost signal output means You When receiving the defrosting signal,
The inflow of the refrigerant supplied to the refrigerating compartment cooling unit is blocked by a blocking means, and the air circulating means provided in the refrigerating compartment cooling unit is controlled to move the air in the refrigerating compartment to the refrigerating compartment. A refrigerator / refrigerator for vehicles, comprising: a defroster for refrigeration, which is circulated through a cooling unit to defrost the evaporator for refrigeration.