JPH0125259Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an in-vehicle refrigerator using an in-vehicle air conditioner.

Traditionally, in-vehicle air conditioning systems (including cooling systems)
Refrigerators that use a (3) A device that directs a portion of the cold air from the air conditioner into the refrigerator to cool the refrigerator. Among these, in the case of the refrigerator mentioned in (3) above, it is easy to install the refrigerator in any location according to the space of the car, and it is relatively easy to install the refrigerator as an option only for people who need it. However, the temperature of the cold air often fluctuates greatly depending on the driving conditions of the car, and especially once the engine is stopped for a while or when the driving speed is low, the temperature of the cold air increases. It is necessary to send a considerable amount of cold air into the refrigerator, and the interior of the refrigerator is stirred with a considerable amount of air. There was a drawback that the temperature of the stored material would rise rapidly if the temperature was higher than that of the conventional method.

In order to eliminate the above-mentioned drawbacks of the conventional method, the present invention is designed to introduce only low-temperature cold air into the refrigerator.Examples will be described below.

FIG. 1 is a configuration explanatory diagram showing one embodiment of a vehicle-mounted refrigerator of the present invention, and FIG. 2 is an electric circuit diagram thereof.
In the figure, 1 is an air passage, 2a is an intake port for air outside the vehicle, 2b is an intake port for air inside the vehicle, 3 is a blower motor, 4 is an evaporator, 5 is an air mix damper, 6 is a heater core, 7a, 7b,
7c are air outlets for VENT, DEF, and FLOOR, respectively, and these are connected to the air conditioner 10 along with a refrigerant circuit such as a compressor (not shown) and a hot water supply source.
Configure.

Reference numeral 11 denotes a refrigerator body, the entire surface of which is covered with a heat insulating material, and a cold air inlet 12 is provided at the lower part of the refrigerator body, and a cold air outlet 13 is provided at the upper part. A rubber hose 14 is connected to the introduction port 12.
One end of the rubber hose 14 is attached, and the other end of the rubber hose 14 is attached to an opening 1a provided on the outlet side of the evaporator 4 of the passage 1. The outlet side of the exhaust port 13 communicates with the interior of the vehicle, and is provided with a leaf valve 15 made of rubber or the like.

Reference numeral 16 is an on-off valve, such as a solenoid valve, provided in the middle of the rubber hose 14, and is operated by a signal from a control circuit to be described later.
Open and close 4. A temperature sensor 17, such as a thermistor, detects the temperature _T1 of the cold air, and is provided near the opening 1a of the passage 1. Further, 18 is a thermistor that detects a predetermined temperature, here the temperature T ₂ inside the refrigerator main body 11, and is provided at a suitable location inside the refrigerator main body 11.

19 is a control circuit, which includes resistors R1 to R5, comparators OP1 and OP2, and transistors TR1 and TR2.
, a variable resistor VR, and relays RL1 and RL2. Also, 20 is an ignition switch, 21 is a fuse, 22 is a battery, 23
is the blower switch, 24 is the compressor magnetic clutch, 25 is the air conditioner and refrigerator switch, rl
1 and RL2 are make contacts of relays RL1 and RL2.

Next, the operation will be explained. Initially, it is assumed that the ignition switch 20 is in the on state and the engine (not shown) is in the operating state. First, the blower switch 23 is operated to rotate the blower motor 3 at a desired air volume, and the switch 25 is turned on to supply power to the control circuit 19. In the control circuit 19, the voltage V ₁ corresponding to the temperature detected by the thermistor 17, that is, the temperature T ₁ of the cold air, is compared with the voltage V ₀ corresponding to the set temperature T ₀ of the variable resistor VR by a comparator OP1. Normally, when cooling starts, the temperature T ₁ is higher than the temperature T ₀ , so V ₁ >V ₀ , and the comparator OP1
The output becomes high level, transistor TR1 is turned on, and current flows through relay RL1. As a result, the make contact rl1 is turned on, the magnetic clutch 24 is operated, and the compressor starts operating. The air taken in from the air intake port 2a or 2b is blown into the passage 1 by the blower motor 3, and is cooled by the evaporator 4 which receives refrigerant from the refrigerant circuit.
After being dehumidified, the air mix damper 5 controls the amount of air passing through the heater core 6, which heats the air, and the temperature is controlled.
It is blown out into the car from 7c. As the air cools down, the temperature detected by the thermistor 17 becomes lower, and V ₁ <V ₀
When this happens, the output of comparator OP1 becomes low level.
As a result, the transistor TR1 is turned off, the magnetic clutch 24 is disconnected, the supply of refrigerant to the evaporator 4 is stopped, and the cooling of the air is stopped. Thereafter, the temperature inside the vehicle is controlled by repeatedly turning the magnetic clutch 24 on and off.

On the other hand, the voltage V ₁ corresponding to the temperature T ₁ detected by the thermistor 17 is applied to the thermistor 18 by the detector OP2.
, that is, the voltage V ₂ corresponding to the temperature T ₂ inside the refrigerator main body 11 . Normally, since temperature T ₂ is larger than temperature T ₁ , V ₂ > V ₁ , and the comparator
The output of OP2 becomes high level. As a result, transistor TR2 is turned on, current flows through relay RL2, make contact rl2 is turned on, and solenoid valve 16 is opened. Therefore, a part of the air cooled by the evaporator 4 is introduced into the refrigerator main body 11 from the opening 1a via the rubber hose 14, thereby cooling the inside of the refrigerator main body 11 and the stored items (not shown). Here, if the engine is stopped for a while or the running speed decreases, that is, the function of the refrigerant circuit stops or decreases, and the detected temperature T ₁ of the thermistor 17 changes.
When the detected temperature T ₂ of 8 is exceeded and V ₂ <V ₁ , the output of the comparator OP2 becomes a low level, which turns off the transistor TR2 and closes the solenoid valve 16. For this reason, the refrigerator body 11
Air with a temperature higher than that inside the refrigerator main body 11 is not introduced into the refrigerator body 11, and the temperature of stored items does not rise. Further, when the temperature T ₁ becomes smaller than the temperature T ₂ after this, the solenoid valve 16 opens again, and the following steps are performed.
Similarly, only air whose temperature is lower than that temperature is introduced into the refrigerator main body 11 and is cooled.

In order to reduce costs, the control circuit 19 in the above embodiment was designed to also perform on/off control of the magnetic clutch 24 of the air conditioner. In particular, when a refrigerator is retrofitted to a car equipped with a normal air conditioner, there is no duplication of parts, which is advantageous in terms of cost. Also,
In the above embodiment, the predetermined temperature is the refrigerator main body 11.
Although a temperature T ₂ within a range of 100° C. was used, a certain temperature (for example, 7 to 8° C.) may also be used. Further, in the above embodiment, the thermistor 17 for detecting the temperature T ₁ of the cold air was provided near the opening 1a of the passage 1, in other words, near the outlet side of the evaporator 4, but it may be attached to the evaporator 4 itself.

As explained above, according to the present invention, in an on-vehicle refrigerator that cools the refrigerator by introducing cold air from an on-vehicle air conditioner into the refrigerator, a temperature sensor that detects the temperature of the cold air, and a temperature sensor for introducing the cold air into the refrigerator are provided. Since it includes an on-off valve for the route provided in the middle of the route, and a control circuit that operates to open the on-off valve only when the temperature of the cold air is below a predetermined temperature based on the detection signal of the temperature sensor. When the engine stops or the vehicle speed decreases and the cooling function in the air conditioner decreases, this prevents hot air from entering the refrigerator and prevents the temperature of stored items from rising rapidly. , it has the advantage of being able to maintain a low temperature at all times.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is an explanatory diagram of the configuration of a vehicle-mounted refrigerator, and FIG. 2 is an electric circuit diagram. 4... Evaporator, 11... Refrigerator body, 14...
Rubber hose, 16...Solenoid valve, 17,
18... thermistor, 19... control circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In an on-vehicle refrigerator that cools the refrigerator by introducing cold air from an on-vehicle air conditioner into the refrigerator, a temperature sensor that detects the temperature of the cold air, and a temperature sensor that introduces the cold air into the refrigerator. The method includes an on-off valve for the route provided in the middle of the route, and a control circuit that operates to open the on-off valve only when the temperature of the cold air is below a predetermined temperature based on the detection signal of the temperature sensor. An on-vehicle refrigerator featuring: (2) The in-vehicle refrigerator according to claim 1 of the utility model registration claim, characterized in that the temperature inside the refrigerator is a predetermined temperature. (3) The vehicle-mounted refrigerator according to claim 1 or 2 of the utility model registration claim, characterized in that a temperature sensor is attached to the evaporator or near the outlet side of the evaporator.