JPH04203873A - On-vehicle refrigerator - Google Patents

Abstract

PURPOSE:To control the inside temperature of a refrigerator even when the cooling speed of the inside temperature and the freezing speed of cold heat accumulating material are quick and a power supply for a condensing unit is cut off by a method wherein a temperature, whereat a fan motor is put ON/OFF, is set so as to be higher than the ON/OFF temperature of a compressor. CONSTITUTION:The detecting temperature of a temperature sensor 8 for the inside of a refrigerator, whereat a compressor is put ON/OFF, is set so as to be lower than the detecting temperature of another temperature sensor 7 for an evaporator putting an inside fan motor 5 ON/OFF. When the inside temperature as arrived at an objective temperature, the temperature sensor 8 for the inside of a refrigerator, whose set temperature is high, detects the temperature and stops the inside fan motor 5. At this time, the cold heat accumulating material 4 is not frozen sufficiently and, therefore, the driving of the compressor of a condensing unit 6 is continued. Then, the temperature sensor 7 for an evaporator detects the temperature when the temperature of the cold heat accumulating material 4 has become a set temperature and a power supply for the condensing unit 6 is put OFF. Next, when the current of the condensing unit 6 is cut OFF, the frozen cold heat accumulating material 4 can keep a cold heat keeping temperature for a given period of time.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a vehicle-mounted refrigerator.

In recent years, more and more tour buses and private passenger cars are equipped with refrigerators. In addition, transport trucks that transport supplies that need to be stored at low temperatures either have loading beds or refrigerators.

However, the only power sources for refrigerators in automobiles are an engine-based generator and a battery, which has a limited capacity.

[Conventional technology]

FIG. 6 is an explanatory diagram of a conventional vehicle-mounted refrigerator. In FIG. 6, the in-vehicle refrigerator 21 has a cabinet 22
For example, a condensing unit 26 consisting of a compressor (not shown), and a controller 27 that controls the temperature inside the refrigerator. A connected evaporator 23 is provided in the upper part of the chamber. The evaporator 23 includes:
It is attached in direct contact with the cold storage material 24. Also,
An internal temperature sensor 25 for detecting the temperature inside the refrigerator is attached to the evaporator 23. Therefore, in the vehicle refrigerator 21 equipped with one temperature sensor as described above, the temperature near the evaporator 23 is detected by the internal temperature sensor 25 attached to the evaporator 23, and the controller 27 is activated depending on the temperature. , the temperature inside the refrigerator is estimated and controlled.

[Invention or problem to be solved]

However, since the temperature inside the refrigerator is controlled by the temperature sensor 25 installed near the evaporator 23 as described above, the temperature inside the refrigerator is not uniformly cooled at the initial stage after the switch is turned on. When the temperature drops below a certain level near the evaporator 23, the internal temperature sensor 25
It works and turns off the power. In addition, the cold storage material 24
Similarly, when the cold storage material 24 is frozen, the internal temperature sensor 25 turns off the power due to the temperature in the vicinity, even though the cold storage material 24 is not frozen. In such a case, the compressor of the condensing unit 26 restarts cooling the inside of the refrigerator only after the internal temperature sensor 25 detects a rise in temperature near the evaporator 23 .

Therefore, the conventional temperature detection means described above has a problem in that it takes time to equalize the temperature inside the refrigerator.

Furthermore, even if the temperature near the refrigerator internal temperature sensor 25 reaches a specified value or lower and the cold storage material 24 is frozen at the initial stage of turning on the power as described above, the temperature in the area far from the refrigerator internal temperature sensor 25 is The problem is that the cold storage material 24 is not frozen.

Furthermore, after the power to the condensing unit 26 is turned off, the temperature inside the refrigerator is determined by the melting of the cold storage material 24 near the temperature sensor 25 for the refrigerator. In other words, if a portion of the cool storage material 24 that is far from the internal temperature sensor 25 is sufficiently frozen, there is a problem in that energy is wasted even though the internal temperature can be controlled. .

The present invention is intended to solve the above problems.
To provide an on-vehicle refrigerator that cools the temperature inside the refrigerator and freezes a cold storage material quickly, and can control the temperature inside the refrigerator even if the power to a condensing unit is cut off.

Another object of the present invention is to provide an on-vehicle refrigerator that consumes less power.

[Means to solve the problem]

In order to achieve the above object, the in-vehicle refrigerator of the present invention has the following features:
A first temperature sensor has a cold storage material installed in contact with the evaporator inside the refrigerator, and detects the temperature near the evaporator to control ON/OFF of the compressor. a second temperature sensor that controls a fan motor that circulates cold air in the compressor;
The temperature is configured to be set higher than the temperature for FF.

The second temperature sensor in the present invention is configured to control the louvers that circulate cold air in the refrigerator, and to set the temperature at which the louvers in the refrigerator are opened and closed to be higher than the temperature at which the compressor is turned on and off.

[For production]

The ON-OFF temperature of the fan motor that circulates cold air inside the refrigerator is set to be higher than the ON-OFF temperature of the compressor, so the ON-CUFF of the fan motor is set so that the temperature inside the refrigerator remains constant. repeat. During this time, since the compressor is in the ON state, it operates to freeze the cold storage material. In particular, when the fan motor is stopped, much of the compressor's cooling energy is spent on freezing the cold storage material.

In other words, since the temperature inside the refrigerator and the temperature of the cold storage material can be controlled by separate temperature sensors, the time it takes to reach the target temperature inside the refrigerator and the time until the cold storage material freezes is faster than in conventional car refrigerators. became.

Also, the power to the condensing unit is turned OFF.
Even if the compressor does not operate in the cold, the target temperature inside the refrigerator can be controlled by the fan motor as long as there is cold storage energy in the frozen cold storage material. The fan motor and the controller that controls the fan motor require less power than the compressor.

Moreover, since the evaporator and cold storage material are isolated from the interior of the refrigerator by the louver inside the refrigerator, it is possible to perform the same operation as the fan motor described above by opening and closing the looper.

〔Example〕

The in-vehicle refrigerator of the present invention will be explained with reference to FIG. In FIG. 1, an on-vehicle refrigerator 1 includes a cabinet 2, a condensing unit 6 comprising, for example, a compressor (not shown), and a controller 9 that controls the temperature inside the refrigerator.

An evaporator 3 connected to the condensation song 22-1-6 is provided in the upper part of the refrigerator. The self-illuminated evaporator 3 is, for example, formed in a cylindrical shape as shown in FIG. 1, and is provided around the cylindrical shape so as to be in direct contact with the cool storage material 4. Further, a fan motor 5 is attached to one open end of the cylindrical evaporator 3 to circulate cold air inside the refrigerator. Further, an evaporator temperature sensor 7 is attached to a part of the evaporator 3. An internal temperature sensor 8 is provided at a predetermined position inside the cabinet 2 .

The condensing unit 6, the evaporator temperature sensor 7, and the internal temperature sensor 8 are each controlled by a controller 9. At this time, the temperature detected by the internal temperature sensor 8 that turns on and off the compressor is set to be lower than the temperature detected by the evaporator temperature sensor 7 that turns the internal fan motor 5 on and off.

Next, the operation of the in-vehicle refrigerator of the present invention will be explained with reference to FIGS. 3 to 5.

It is assumed that the in-vehicle refrigerator 1 initially starts cooling at an ambient temperature of 30 degrees Celsius. The evaporator 3 cools the cold storage material 4 and the temperature inside the refrigerator by the compressor (not shown) of the condensing unit 6, as shown in FIG.

If the temperature inside the refrigerator reaches the target temperature shown in Figure 3,
The temperature sensor 8 for inside the refrigerator, which has a high set temperature, detects the temperature and stops the fan motor 5 inside the refrigerator. At this point, the cold storage material 4 is not sufficiently frozen, so the compressor of the condensing unit 6 continues to drive.

Then, when the temperature reaches -110 degrees Celsius, which is the set temperature of the cold storage material 4, the evaporator temperature sensor 7 detects the temperature and turns off the power to the condensing unit 6.

In this manner, when each temperature sensor reaches its respective set temperature, the fan motor 5 and the condensing unit 6 repeat ON and OFF independently, and operate as shown in FIG. 4, for example.

Next, turn the power supply of the condensing unit 6 to 0FF (5th
(See Figure 3), the frozen cold storage material 4 can maintain the cold storage temperature for a certain period of time. If there is a small amount of electric power, the fan motor 5 and controller 9 can be operated,
Cold storage can be performed using the cold storage material 4. That is, as shown in Fig. 5, the fan motor 5 is controlled to keep the temperature inside the refrigerator at a constant temperature during the time period from when the power is turned OFF to when the cold storage material 4 is no longer able to maintain the cold temperature. keep.

Another embodiment will be described with reference to FIG. Second
In the figure, parts that are the same as those in the embodiment shown in FIG. 1 are given corresponding symbols, and their explanations will be omitted. The difference between the two is that instead of the fan motor 5 in the embodiment shown in FIG.
1 is provided with a louver opening/closing actuator 12 for opening and closing the louver. Since the fan motor 5 is not provided, the shape of the evaporator 3 and the cold storage material 4 need not be cylindrical, and the internal looper 11 isolates the evaporator 3 and the cold storage material 4 from the inside of the refrigerator. It is set up like this. Therefore, if the evaporator 3 and the cold storage material 4 are shaped as shown in FIG. 2, the area inside the refrigerator can be effectively taken.

In addition, similarly to the above embodiment, the compressor is turned on and off.
The temperature detected by the temperature sensor 8 for inside the refrigerator is set to be higher than the temperature detected by the temperature sensor 7 for the evaporator, which controls the actuator 12 for opening and closing the looper 11 for the refrigerator from ON to FF.

Similar to the embodiment described above, when the vehicle refrigerator 1 is turned on, the evaporator 3 and the cold storage material 4 are cooled to the target internal temperature by a compressor (not shown), as shown in FIG. 3. . Thereafter, the internal temperature sensor 8 having a high set temperature detects the temperature and operates the actuator 12 to close the internal looper 11.

At this point, the cold storage material 4 is not sufficiently frozen, so the compressor of the condensing unit 6 continues to be driven to cool the cold storage material 4. When the set temperature of the cold storage material 4 reaches 110 degrees Celsius, the evaporator temperature sensor 7 detects the temperature and stops the power supply to the condensing unit 6.

In this way, when each temperature sensor reaches its respective set temperature, the actuator 12 that opens and closes the internal looper 11 and the condensing unit 6 are turned on independently.
-OFF is repeated, and the fan motor 5 operates as shown in (1) to (2) shown in FIG.

Next, turn the power supply of the condensing unit 6 to 0FF (5th
(See Figure 3), the frozen cold storage material 4 can maintain the cold storage temperature for a certain period of time. A small amount of electric power is required to open the internal looper 11 (operate the actuator 12 and controller 9), so the cold storage material 4 can maintain the internal temperature at a constant temperature. In other words, as shown in FIG. As shown in the figure, the internal looper 11 is controlled to open and close to maintain the internal temperature of the refrigerator at a constant temperature during the period from (1) when the power is turned off to (2) shown in FIG.

〔Effect of the invention〕

According to the present invention, the temperature sensor for the refrigerator controls the temperature inside the refrigerator to reach the target temperature, and the temperature sensor for the evaporator controls the temperature to freeze the cold storage material. The time it takes for the material to reach its freezing temperature becomes faster.

According to the present invention, the temperature inside the refrigerator can be controlled as long as the cold storage energy remains in the cold storage material after the power to the compressor is turned off.

According to the present invention, since the temperature inside the refrigerator and the temperature of the cold storage material are controlled separately, the number of times the compressor is turned on and off is relatively small, and the power consumption of the vehicle battery is reduced.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of a vehicle-mounted refrigerator according to the present invention, FIG. 2 is an explanatory diagram of another embodiment of the present invention, FIG. 3 is an explanatory diagram of the relationship between the cold storage material and the temperature inside the refrigerator according to the present invention, and FIG. FIG. 5 is an explanatory diagram of the ON-OFF state of the fan motor and condensing unit. Figure 5 is an explanatory diagram of the relationship between the internal temperature of the refrigerator and the temperature of the cold storage material after the condensing unit is turned off. Figure 6 is an explanatory diagram of the conventional car refrigerator. be. l... Vehicle refrigerator 2... Cabinet 3... Evaporator 4... Cold storage material 5... Fan motor 6... Condensing unit 7... Temperature sensor for evaporator 8... Inside the refrigerator Temperature sensor 9...Controller 11...Inner looper 12...Actuator rc Hiroshi Mori, Patent Attorney (2 others) Car refrigerator 1 Car refrigerator I Car refrigerator 21 Fig. 6

Claims (2)

[Claims] (1) In an on-vehicle refrigerator that has a cold storage material installed in contact with an evaporator inside the refrigerator, there is a first temperature sensor that detects the temperature near the evaporator and controls ON/OFF of the compressor, and a first temperature sensor that controls the temperature inside the refrigerator. a second temperature sensor that detects and controls a fan motor that circulates cold air in the refrigerator; Features of this in-vehicle refrigerator. (2) The second temperature sensor controls the opening and closing of the internal louvers that circulate the cold air in the refrigerator, and is set so that the temperature at which the internal louvers are opened and closed is higher than the temperature at which the compressor is turned on and off. Claim (1) characterized in that
) In-vehicle refrigerators listed.