JPH01285766A - Refrigerator - Google Patents

Abstract

PURPOSE:To maintain the temperature in the refrigerator at that of the storage temperature of cooled objects while freezing the refrigerant by providing a refrigerator cooler and a refrigerant freezer, controlling the refrigerant supply to the refrigerator cooler by means of a valve, and regulating the control of the valve and compressor based on the refrigerator. CONSTITUTION:The interior space A of the refrigerator is cooled by a refrigerator cooler 17 as a refrigerant compressor 14 is operated and a valve 21 is opened. When the temperature in the refrigerator interior space A drops, the valve 21 is closed, and the cooling is performed solely by a freezer 18 for refrigerant 25. At the refrigerator interior space temperature of -0.5 deg.C, the compressor 14 is stopped, whereupon about 50% of refrigerant is frozen. At the refrigerator interior space temperature of 0.5 deg.C, the compressor 14 is started to resume the cooling of refrigerant 25, which is stopped at the refrigerator interior space of -0.5 deg.C. At this time, about 65% of refrigerant 25 is frozen, and, as the process advances, the operating time of the compressor 14 becomes shorter, while the cooled objects are stored without being frozen. This way, the refrigerant 25 can be frozen while the temperature of the refrigerator interior space A is maintained at a set level.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a refrigerator capable of cooling objects to be cooled by a cooler and cooling objects to be cooled by latent heat of fusion of a cold storage agent.

(b) Prior art As a technology prior to the present invention, Japanese Patent Application Laid-Open No. 62-210369
There is a refrigerator equipped with a cold storage agent described in the publication. In a refrigerator, a cold storage agent is disposed within an insulating box body, and an internal cooler of a refrigeration cycle and a cold storage agent freezing cooler are connected in series. The temperature inside the refrigerator is maintained at a set temperature by stopping the compressor using a temperature control device.

Since the compressor is controlled by a temperature control device, it takes a long time to completely freeze the refrigerant, so the operation circuit of the pressurized rabbit machine is configured until the refrigerant is frozen. The compressor continues to be driven regardless of whether the temperature control device is opened or closed.

It takes about 6 hours to freeze the cold storage agent even if the compressor continues to be driven, and by freezing the cold storage agent, the evaporation temperature of the cooler is about -15 to -20°C. When the cold storage agent is completely frozen, the temperature inside the refrigerator is cooled by the refrigerator cooler.
The temperature will be -15 to -20°C.

Therefore, if you put the object to be cooled in the refrigerator until the cold storage agent is frozen, the object to be cooled will freeze. It was not possible to freeze the cold storage agent when it contained objects to be cooled that did not require cooling.

Furthermore, by storing the objects to be cooled in the refrigerator after the cold storage agent has frozen, even if the loading time of the objects to be cooled is reduced to about 3 minutes with the opening/closing door open, the temperature inside the refrigerator will rise and the outside temperature will increase. If the temperature control device does not perform additional cooling for about 30 minutes after loading the objects to be cooled, the cooling time by the regenerator will be shortened.

Furthermore, this type of refrigerator cools the interior of the refrigerator using a cold storage agent without using electricity, so when used as a mobile refrigerator for shipping cooled items to the market, shipping can be done quickly and early in the morning. Since this must be done within hours, it is particularly necessary to shorten the time for loading the objects to be cooled and the time for additional cooling.

(C) Problems to be Solved by the Invention The technical problem of the present invention is to provide a refrigerator that can simultaneously freeze a cold storage agent and store objects to be cooled inside the refrigerator. .

(2) Means for Solving the Problems The present invention provides an insulating box for storing objects to be cooled and having an opening/closing door, a cold storage agent disposed inside the insulating box, and an internal cooler for cooling the inside of the insulating box. , a cold storage agent freezing cooler that freezes the cold storage agent, an internal cooler and a cold storage agent freezing cooler are connected in parallel,
A refrigeration cycle consisting of a compressor, a condenser, etc., a refrigerant flow path opening/closing device connected in series to an internal cooler, and a first temperature control device that controls the operation of the compressor to maintain the set internal temperature. This problem is solved by a means formed by a second temperature control device that controls opening and closing of the refrigerant passage opening/closing device in a range of temperature inside the refrigerator that is higher than the set temperature inside the refrigerator.

The first temperature control device and the second temperature control device are formed individually and placed at predetermined locations within the refrigerator where the temperature inside the refrigerator can be appropriately detected without malfunction. The first temperature control device stops the compressor within a range of about ±1 degree of the preset internal temperature, and the second temperature control device stops the compressor within a range of about ±1 degree from the preset internal temperature. Open/close the switchgear within a range that does not overlap with the internal temperature control range.

However, if the control temperature difference between the first temperature control device and the second temperature control device is large, the temperature inside the refrigerator will not be sufficiently controlled.
A temperature sensor is installed inside the refrigerator so that the point temperature can be set appropriately, and the signal from the temperature sensor is used to generate the open and close signals of the opening/closing device, and the stop and operation signals of the compressor. It is also possible to form a temperature control device that can output enough output, and to use the first and second temperature control devices as both temperature control devices.In this case, the temperature that is manually set by the temperature control device may be determined based on ease of use. It is preferable to set the temperature inside the refrigerator as the set temperature, and the temperature for controlling the opening/closing device and the compressor is automatically set based on the set temperature inside the refrigerator.

The operation control of the compressor may be stoppage control or capacity control.

There are no particular limitations on the material of the cold storage agent, and any material known at the time of filing can be used as appropriate in accordance with the specifications of the refrigerator.

Since the present invention uses a cold storage agent for cooling, it is effective during transportation when it is difficult to secure power to the compressor.
It can be conveniently used when shipping and distributing materials to be supplied to a chain cafeteria in one place, and for this purpose, it is more convenient to use if the cooling warehouse is provided with wheels for transportation.

(E) Function The present invention, when the temperature inside the refrigerator approaches the set temperature, closes the opening/closing device and supplies refrigerant only to the cold storage agent freezing cooler, cools and freezes the cold storage agent, and lowers the temperature inside the refrigerator. When the temperature rises, the opening/closing device is opened to directly cool the inside of the refrigerator using the internal cooler.If the temperature changes around the set temperature, indirect cooling is performed using a cold storage agent and the compressor is stopped to maintain the set temperature. do.

EXAMPLE 1 Taking a mobile refrigerator 1 as an example, the structure of the present invention will be concretely explained based on FIGS. 1 to 4.

The mobile refrigerator 1 includes an insulating box 3 that can be opened and closed by a front opening/closing door 2, a machine room 4 formed on the lower surface of the insulating box 3, and the insulating box 3 and the machine room 4. It has wheels 5 that allow it to move freely. The heat insulating box body 3 is formed of both inner and outer boxes 6.7 made of metal plates such as stainless steel plates, and a heat insulating material 8 that can be filled with foam between the two boxes 6.7. The front opening/closing door 2 is formed of front and rear boxes 9.10 made of metal plates such as stainless steel plates, and a heat insulating material 11 filled with foam between the two boxes 9.10. The upper and lower parts are attached to the front opening and side edges of the heat insulating box 3 with pins 12 so that they can be opened and closed. When the opening of the heat insulating box body 3 is closed with the front opening/closing door 2, it is opened so as to have airtight heat insulating properties, and a handle 13 which also serves as a lock prevents it from being opened inadvertently.

In the machine room 4, there is a refrigerant press machine 14 that forms a refrigeration cycle.
The compressor 14, etc., which is a zero-weight object that houses the condenser 15, the air blower 16 for blowing air to the condenser 15, etc., is arranged so as to be located in a space surrounded by wheels 5, and is a mobile type. The refrigerator 10 incorporates a stopper to ensure stability when running and to prevent the vehicle from running when parked. The coolers constituting the refrigeration cycle include an internal cooler 17 disposed on the outer surface of each of the back, left, and right walls of the inner box 6 of the insulation box 3, that is, on the side of the insulation material 8;
It is connected in parallel with a heat storage agent freezing/cooling device 18 disposed on the outer surface of the upper wall of the inner box 6, that is, on the side surface of the heat insulating material 8. On the condenser 15 side of each cooler 17, 18, a refrigerant throttling device 19 for an internal cooler and a refrigerant throttling device 20 for a cold storage agent freezing cooler are connected in series. Refrigerant throttling device 19 for internal cooler
On the condenser 15 side, there is a switching device 21 consisting of a refrigerant solenoid valve, etc.
are connected in series. A dryer 22 is connected to the refrigerant outlet of the condenser 15, and an accumulator 23 and a check valve 24 are connected to the refrigerant inlet of the compressor 14.

The internal cooler 17 and the cold storage agent freezing cooler 18 are formed by a tube-on-sheet method in which cooling pipes are arranged in the inner box 6 in a meandering manner. To cool the interior A of the refrigerator which stores the objects to be cooled, first the inner box 6 is cooled by the evaporation action of the reduced pressure liquid refrigerant passing through the cooling pipe of the interior cooler 17, and then the interior of the refrigerator is cooled by the radiant heat from the inner box 6. The air in A is cooled and caused to flow naturally. Cooling by the internal cooler 17 in the internal refrigerator A is as follows:
When the refrigeration cycle is performed only during operation, and when the compressor 14 is de-energized and the refrigerator 1 is moved, the cold storage capacity of the cold storage agent 25 disposed in the upper wall of the inner box 6 is increased. It will be held at

The cold storage agent 25 is composed of a large number of cylindrical cold storage bodies, and the cold storage bodies are made of a press-deformable plastic bag and a gel agent such as potassium chloride filled in the plastic bag. Fixing plate 26 formed of a metal plate etc. with holes formed therein.
By fixing the inner box 6 to the inner surface of the upper wall with alligator screws, the cold storage agent 25 is suppressed to flatten deformation due to being sandwiched between the fixing plate 26 and the inner box 6 at R-a. Then, a cold storage agent freezing cooler 18 is installed to improve the adhesion to the wall J of the inner box 6. In order to cool and efficiently freeze the cold storage agent 25, it is only necessary to efficiently exchange heat with the cold storage agent freezing cooler 18, and the cooling pipes of the cold storage agent freezing cooler 18 and the inner box 6 are The cold storage agent 25 is made to meander in a ridge shape.
The fixing plate 26 is fixed to the inner box 6 with screws, but the fixing plate 26 can be removed if necessary, and the cool storage agent 25 can be replaced.

Refrigerant diaphragm! The resistance value of 19.20 means that when the switchgear 21 is open, the evaporation temperature of the coolers 17 and 18 is -1
If the opening/closing device 21 is closed and the refrigerant flows only to the refrigerant restrictor rjt 20 for the cold storage agent freezing cooler, lower the evaporation temperature to -5 to -30°C.
It is set so that the cold storage agent 25 is more likely to freeze more quickly.

Since the cold storage agent freezing cooler 18 is covered with the cold storage agent 25, the cold storage by the cold storage agent 25 is not performed sufficiently until the cold storage agent 25 freezes, and conversely, the inside cooler 17 is not able to maintain the cold sufficiently. The cooling of A is the cold air inside the refrigerator and is used to cool the portion of the cold storage agent 25 between the inside of the refrigerator. As the freezing rate of the cold storage agent 25 progresses, the cold retention power to the refrigerator interior A increases.

The opening/closing control of the opening/closing device ff21 and the stoppage control of the pressure 4a machine 14 are performed by detecting the temperature inside the refrigerator A.

The stoppage control of the compressor 14 is performed to maintain the set internal temperature Tstl-, and the opening/closing control of the opening/closing device 21 is performed within a range of internal temperature higher than the set internal temperature Ts.

The opening/closing bag [21 is performed by the second temperature control device, and the compressor 1
4 is performed by the first temperature control device, but in this structure, temperature discrimination control bags c and 28 receive a detection signal from a temperature sensor 27 disposed in the refrigerator interior A and determine the temperature of the refrigerator interior A. Accordingly, the pressure 41 is used to control the machine 14 and the opening/closing device 121. The temperature discrimination control device 28 controls the compression #! 14 operating temperatures 1. and the stop temperature t, the compressor 14
a first temperature control device that outputs a stop signal, and a switching device f.
A second temperature control device that detects the opening temperature t of the opening/closing device 221 and the closing temperature t of the opening/closing device 221 and outputs an opening/closing signal for the opening/closing device 221 is integrally formed. The temperature discrimination control device 28 is formed in this structure so that the internal temperature Ts can be set appropriately.
The adjustment range is 1°C to +1010°C.

When setting the internal temperature Ts, each temperature Ll, L*, t
3. In a zero-wire structure in which t4 is automatically set at the initially set temperature difference, the operation t is (
T s -0,5>'C. Opening temperature t.

can be set to (T s + 2 + 0.5>''C, and the closing temperature t4 can be set to (T s + 2-0.5)'C.The temperature difference between each temperature t3, tl, ji, and ji is The temperature is set to 1°C. Specifically, in Figure 4, Ts 0°C, t -0.5°C, tt - 0.5°C,
i, m2.5°C, t, -1.5°C, and the temperature inside the vehicle is adjusted within a range in which the objects to be cooled do not freeze. This temperature control is performed only when the compressor 14 is energized, and while the refrigerator 1 is being moved, the cold storage capacity of the frozen cold storage agent 25 is used to maintain the temperature inside the refrigerator at the temperature when the energization is stopped. It is maintained for a certain period of time. Various cold storage capacities can be set depending on the cold storage power and quantity of the S cooling door 25, but with this structure, the time that the internal temperature can be maintained at O''C is approximately 6 hours at an outside temperature of 30''C unless the opening/closing door 2 is opened. I'm trying to make time.

Based on the operation chart for dealing with internal temperature change in FIG. 4, the process until the cool storage agent 25 in the refrigerator 1 reaches 212fIs will be explained.

t l-0,5'C,t, -0,5°C, ts-
The temperature will be explained assuming that the temperature is 2.5°C and ta"1.5°C.

When the object to be cooled is stored in the chamber A and the cold storage agent 25 freezes,
When the 11tR is put in so that it can be shipped and delivered as is, cooling operation begins. At the beginning of the J conversion, the temperature inside the refrigerator A is about the same as the outside air temperature, and if the object to be cooled is chilled food, the food inside the refrigerator A will be cooled, but normally, unless it is winter, In summer, the temperature is around 20°C. By operating the refrigerant compressor 14 and opening the opening/closing device 21, the inside of the refrigerator A
is cooled by the internal cooler 17 to lower its temperature. Since the refrigerant is flowing through the cold storage agent freezing cooler 18, the cold storage agent 25 is also frozen, but this does not have a large effect on lowering the temperature inside the refrigerator A.
When the temperature drops below 1.5°C, the opening/closing device 21 is closed, the cooling of the interior A by the interior cooler 17 is stopped, and the cold storage agent 2
Only cooling by the cold storage agent freezing cooler 18 of No. 5 is performed. Although the inside A of the refrigerator is indirectly cooled by cooling the cold storage agent 25, it is not so bad when the temperature is below 1.5° C., and its capacity is mainly used for cooling the cold storage agent 25. Therefore, when the temperature inside the refrigerator A is 1.5°C, the compressor 1
It took about 2 hours and 8 degrees for the temperature to drop to 105 degrees Celsius, which is when the operation of No. 4 was stopped, and the temperature inside the refrigerator A reached 1045 degrees Celsius.
Compressor 14 stops. At this time, about 50% of the cold storage agent 25 is frozen. When the operation of the compressor 14 is stopped, the temperature inside the refrigerator rises due to the loss from the outside air temperature due to the cooling of that part and the insulation capacity of the insulation box because the cold storage agent 25 is not frozen inside the refrigerator, and the temperature inside the refrigerator rises to 0. Seven compressions jJ1 resulting in .5°C
14 starts, and cooling of the cold storage agent 25 is restarted.

When the operation of the compressor 14 is restarted, the temperature inside the refrigerator decreases, and -
When the temperature reaches 0.5'C, the compressor 14 stops again. At this time, about 65% of the cold storage agent 25 is frozen, and when the compressor 14 is stopped, the cold storage agent 25 usually freezes to 100% in about 6 hours. The later the time, the longer the compressor 14 stops.
Driving time becomes shorter. In this state, it operates like a normal refrigerator, and the items to be cooled can be stored without freezing. Therefore, compared to the conventional method in which the object to be cooled is inserted after freezing the cold storage agent 25, there is no need to perform recooling by storing the object to be cooled.

When the opening/closing door 2 is fully opened and closed while the refrigerator 1 is in operation, the cold air inside the refrigerator A escapes, and the temperature inside the refrigerator rapidly rises to about 10° C., as shown in FIG. 4. When the temperature inside the refrigerator rises and the opening temperature j, m of the opening/closing device 21 exceeds 2.5°C, refrigerant is supplied to the refrigerator interior cooler 17, and the refrigerator interior A is directly cooled by the refrigerator interior cooler 17. It is restarted and cooled down to the set internal temperature Ts=O°C in a short time.

In the present invention, cooling of the refrigerator interior A and cooling of the cold storage agent 25 can be individually controlled, and the cold storage agent 25 can be frozen while maintaining the refrigerator interior A at the refrigerator interior set temperature T8. By controlling so that the set temperature Ta inside the refrigerator is maintained, the cold storage agent 25
The cold storage agent 25 can be frozen while preserving the object to be cooled without requiring a special freezing time. Therefore, products that are scheduled to be shipped the next morning can be stored in the refrigerator 1 the night before, making the shipping process more efficient, and the items to be cooled can also be stored in the refrigerator 1, which requires less storage space. .

If power is supplied to the compressor 14 again at the store where it was delivered after transportation, it can be stored for a long time, or at a supermarket, it can be used as a temporary storage until it is stored in a showcase. Since the power supply hood to the compressor 14 becomes a hindrance during transportation, it is preferable to form a storage box, a winding section, a cord reel, etc. for the power supply hood in the refrigerator 1.

(g) Effects of the Invention The present invention forms an internal cooler for cooling the inside of the refrigerator and a cold storage agent freezing cooler for cooling the cold storage agent, and controls the supply of refrigerant to the internal cooler by an opening/closing device. By controlling the opening/closing device and the compressor based on the difference in temperature inside the refrigerator, the inside of the refrigerator can be maintained at the storage temperature of the object to be cooled while cooling and freezing the cold storage agent. It is easy to use and can always be transported.

[Brief explanation of the drawing]

The figures show the present invention, and Fig. 1 is a main part refrigeration cycle and electric circuit diagram, Fig. 2 is a sectional view, and Fig. 35! J is a perspective view, and FIG. 4 is an operation chart. 1... Refrigerator, 2... Opening/closing door, 3... Insulating box body,
4... Machine room, 14... Compressor, 15... Condenser, 17... Internal cooler, 18... Cold storage agent freezing cooler, 21... Switching device, 25...・Cold storage agent, 27...
Temperature detection body, 28...Temperature discrimination control bag

Claims (1)

[Claims] 1. An insulated box with an opening/closing door for storing objects to be cooled;
A cold storage agent placed inside the insulated box, an internal cooler that cools the inside of the insulated box, and a cold storage agent freezing cooler that freezes the cold storage agent.
An internal cooler and a refrigerant freezing cooler are connected in parallel, and a refrigeration cycle consisting of a compressor, a condenser, etc., a refrigerant passage opening/closing device connected in series to the internal cooler, and a set internal temperature are controlled. A refrigerator having a first temperature control device that controls the operation of a compressor so as to maintain the temperature within the refrigerator, and a second temperature control device that controls opening and closing of a refrigerant flow path opening/closing device at an internal temperature range higher than a set temperature in the refrigerator.