JPH071139B2 - Refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a refrigerator that can cool an object to be cooled by a cooler and an object to be cooled by latent heat of fusion of a regenerator.

(B) Conventional Technique As a technique prior to the present invention, there is a refrigerator provided with a cold storage agent described in JP-A-62-210369. In a refrigerator, a regenerator is arranged in a heat insulating box, and an in-compartment cooler of a refrigeration cycle and a regenerator freeze cooler are connected in series. The temperature inside the refrigerator is controlled by stopping the compressor so as to maintain the temperature inside the refrigerator.

Since the compressor is controlled by the temperature control device, it takes a long time to completely freeze the cold storage agent, so the operating circuit of the compressor is configured until the cold storage agent is frozen. The compressor continues to be driven regardless of the opening / closing operation of the temperature control device.

It takes about 6 hours to freeze the cool storage agent even if the compressor is continuously driven. By freezing the cool storage agent, the evaporation temperature of the cooler is about -15 to -20 ° C. When the agent is completely frozen, the temperature inside the refrigerator will be -15 to
It becomes -20 ℃.

Therefore, if the object to be cooled is placed in the refrigerator until the cold storage agent is frozen, the object to be cooled will freeze and the object to be cooled that needs to be refrigerated or stored at ice temperature or frozen at a low temperature. It was not possible to freeze the regenerator in a state in which an object to be cooled that does not require was stored.

In addition, by storing the object to be cooled in the cooling box after the cold storage agent has frozen, even if the loading time of the object to be cooled with the open / close door is set to about 3 minutes, the temperature inside the room rises and the outside air temperature rises. If the additional cooling by the temperature control device is not performed for about 30 minutes after loading the objects to be cooled, the cooling time by the regenerator will be shortened.

Further, in this type of refrigerating box, the inside of the refrigerating box is cooled by a regenerator without cooling with electric power, so that when the object to be cooled is used in a mobile refrigerating box for shipping to the market, the shipping can be shortened early in the morning. Since it has to be carried out in time, it is particularly necessary to shorten the loading time of the objects to be cooled and the additional cooling time.

(C) Problem to be Solved by the Invention An object of the present invention is to provide a refrigerating cabinet that can simultaneously freeze a regenerator and store an object to be cooled in the refrigerator. .

(D) Means for Solving the Problems The present invention provides an insulating box body having an opening / closing door for storing an object to be cooled, a cool storage agent arranged in the insulating box body, and an inside cooler for cooling the inside of the insulating box body. , A cool storage agent freeze cooler that freezes the cool storage agent, and an in-compartment cooler and a cool storage agent freeze cooler are connected in parallel,
A refrigeration cycle including a compressor, a condenser, etc., a refrigerant flow path opening / closing device connected in series to an internal cooler, and operation control of the compressor based on the difference between the internal preset temperature and the internal temperature With the means formed by the temperature control device and the second temperature control device that controls the opening / closing of the refrigerant flow path opening / closing device based on the difference between the second preset temperature higher than the preset temperature in the refrigerator and the preset temperature Is the solution.

The first temperature control device and the second temperature control device are individually formed, and are arranged at a predetermined place in the refrigerating cabinet where proper detection of the in-compartment temperature can be performed without malfunction. In the first temperature control device, the compressor is stopped within a range of about ± 1 degree of the set temperature in the refrigerator, and in the second temperature control device, the second temperature control which is higher than the set temperature in the refrigerator by a constant temperature. Within the range of ± 1 ℃ of the device,
The switchgear is opened and closed within the range that does not overlap with the control range of the internal temperature.

However, if the control temperature difference between the first temperature control device and the second temperature control device is large, the temperature control of the internal temperature will not be sufficiently performed, so that the ON / OFF point temperature of each temperature control device will be reduced. A temperature detector is installed in the refrigerator so that the setting can be properly performed, and the temperature at which the open / close signal of the switchgear and the stop signal / operation signal of the compressor are output according to the signal of the temperature detector. A controller may be formed so that the first and second temperature controllers are combined into a single temperature controller. In this case, the temperature manually set by the temperature control device should be set to the set temperature in the refrigerator considering the convenience of use, and the switchgear and the compressor are automatically controlled based on the set temperature set in the refrigerator. Temperature is set.

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

The material and the like of the cold storage agent are not particularly limited, and any material known at the time of application can be appropriately used according to the specifications of the refrigerator.

INDUSTRIAL APPLICABILITY The present invention is effective during transportation in which it is difficult to secure a power source for the compressor because the cooling agent is used for cooling,
It can be conveniently used when the materials to be supplied to the chained cafeteria are separately shipped and distributed at one place, and for that purpose, it becomes easier to use by forming a moving wheel in the cooling box.

(E) Operation When the inside of the refrigerator is close to the set temperature, the present invention closes the switchgear and supplies the refrigerant only to the cool storage agent freezing cooler to cool and freeze the cool storage agent. When the temperature rises, the switchgear is opened and the inside cooler is used to directly cool the inside of the refrigerator.For temperature changes near the set temperature, the temperature is maintained at the set temperature by performing indirect cooling with the cold storage agent and stopping the compressor. To do.

(F) Example A mobile cooling cabinet 1 will be described as an example to embody the configuration of the present invention with reference to FIGS. 1 to 4.

The mobile cooling box 1 moves including the heat insulation box 3 opened and closed by the front opening / closing door 2, the machine room 4 formed on the lower surface of the heat insulation box 3, the heat insulation box 3 and the machine room 4. It has a wheel 5 which can be freely rotated. The heat insulating box 3 is formed by both inner and outer boxes 6 and 7 made of a metal plate such as a stainless steel plate and a heat insulating material 8 foamed and filled between the both boxes 6 and 7. The front opening / closing door 2 is formed of front and rear boxes 9 and 10 made of a metal plate such as a stainless steel plate, and a heat insulating material 11 foam-filled between the boxes 9 and 10. The front opening / closing door 2 is mounted on the upper and lower sides on one side edge of the front opening of the heat insulating box 3 by means of a binge 12 so as to be freely opened and closed. When the opening of the heat insulating box 3 is closed by the front opening / closing door 2, it is closed so as to have an airtight heat insulating property, and the handle 13 also serving as the lock device does not open it carelessly.

In the machine room 4, a refrigerant compressor 14, which forms a refrigeration cycle,
The condenser 15 and the air blower 16 for blowing air to the condenser 15 are housed. The compressor 14 and the like, which are heavy objects, are arranged so as to be located in a space surrounded by the wheels 5 to ensure stability during traveling of the mobile cooling cabinet 1 and stability during parking installation. There is. The wheels 5 are provided with stoppers for preventing careless travel. The cooler which constitutes the refrigeration cycle includes the outer surface of the inner box 6 of the heat insulating box 3, the outer surface of the left and right outer walls, that is, the heat insulating material 8.
It is formed by connecting in parallel with the inside cooler 17 arranged on the side surface and the regenerator freeze cooler 18 arranged on the outer surface of the upper wall of the inner box 6, that is, the surface on the side of the heat insulating material 8. Condenser 15 for each cooler 17, 18
On the side, a refrigerant expansion device 19 for the internal cooler and a refrigerant expansion device 20 for the cold storage agent freeze cooler are connected in series. An opening / closing device 21 including a refrigerant electromagnetic valve and the like is connected in series to the condenser 15 side of the refrigerant cooler device 19 for the inside cooler. The refrigerant outlet of the condenser 15 is connected to the dryer 22, and the refrigerant inlet of the compressor 14 is connected to the accumulator 23 and the check valve 24.

The inside cooler 17 and the regenerator freeze cooler 18 are formed by a tube-on-sheet method in which cooling tubes are arranged in a meandering manner in the inner box 6. Cooling of the inside A for storing the object to be cooled is performed by first cooling the inner box 6 by the evaporative vaporization action of the decompressed liquid refrigerant passing through the cooling pipe of the inside cooler 17, and then radiating heat from the inner box 6 to cool the inside. Natural convection is performed while cooling the air of A. Cooling of the inside A by the inside cooler 17 is performed only while the refrigeration cycle is in operation. When the compressor 14 is de-energized to move the inside of the refrigerator 1, the inside A of the inside wall 6 This is performed by the cold insulation power of the cold storage agent 25 arranged on the saw surface.

The cool storage agent 25 is composed of a large number of cylindrical cool storage bodies, and the cool storage body is made of a press-deformable vinyl bag and a gel agent such as potassium chloride filled in the vinyl bag. The cool storage agent 25 is formed by a metal plate or the like having a large number of ventilation holes. A fixing plate 26 is fixed to the inner wall of the upper wall of the inner box 6 with a crocodile screw to fix the fixing plate 26 and the inner box 6. She is stuck in between. With this clinging, the cold storage agent 25 is pressed and deforms flat, and the cold storage agent freeze cooler is cooled.
The adhesion with the upper wall of the inner box 6 equipped with 18 is improved. In order to cool the cold storage agent 25 and freeze it efficiently, heat exchange with the cold storage agent freeze / cooler 18 may be performed efficiently, and the cooling pipe of the cold storage agent freeze / cooler 18 and the inner box 6 form the inside of the refrigerator. The contact area with the cool storage agent 25 may be increased by making it meander like a ridge. Although the fixing plate 26 is fixed to the inner box 6 with a screw, the fixing plate 26 can be removed as necessary and the cold storage agent 25 can be replaced.

When the switchgear 21 is open, the resistance values of the refrigerant expansion devices 19 and 20 are such that the evaporation temperatures of the coolers 17 and 18 are about −15 to −20 ° C., the switchgear 21 is closed, and the cold storage is performed. When the refrigerant flows only through the refrigerant expansion device 20 for the agent freeze cooler, the evaporation temperature is lowered to about -25 to -30 ° C so that the cold storage agent 25 is set to freeze more quickly and easily.

Since the cold storage agent freeze cooler 18 is covered with the cold storage agent 25, the cold storage by the cold storage agent 25 is not sufficiently performed until the cold storage agent 25 is frozen, and conversely, the cold storage agent 17 cools the inside A The cooling will be used to cool the inside portion of the cold storage agent 25 by the cold air in the refrigerator. As the freezing rate of the cold storage agent 25 increases, the cold insulation power to the inside A of the refrigerator increases.

Opening / closing control of the opening / closing device 21 and stop control of the compressor 14 are performed by detecting the temperature of the inside A. The stop control of the compressor 14 is performed so as to maintain the inside temperature Ts in the refrigerator, and the opening / closing control of the switchgear 21 is based on the difference between the second preset temperature Te higher than the preset temperature Ts in the refrigerator and the inside temperature. Will be performed. The opening / closing device 21 is operated by the second temperature control device, and the compressor 14 is operated by the first temperature control device.
The temperature discriminating control device 28 for discriminating the temperature of the inside A of the refrigerator in response to the detection signal from the temperature detecting body 27 arranged in
14 and the switchgear 21 are controlled. The temperature determination control device 28 is operated when the temperature detected by the temperature detector 27 is equal to or higher than the operating temperature t ₁ of the compressor 14, and the first temperature control device which outputs a stop signal when the temperature is equal to or lower than the stop temperature t _2; Is integrally formed with a second temperature control device that outputs an opening / closing device 21 opening signal when the opening temperature t ₃ of the refrigerant passage opening / closing device is equal to or higher than the opening temperature t ₃ and outputs a closing signal when the opening temperature is equal to or lower than the closing temperature t ₄ . In this structure, the temperature discrimination control device 28 is formed so that the set temperature Ts in the refrigerator can be appropriately set, and its adjustment range is -5 ° C to + 10 ° C. When the set temperature Ts in the refrigerator is set, each temperature
Te, t ₁ , t ₂ , t ₃ and t ₄ are automatically set to the initially set temperature difference. In this structure, the second temperature is
The set temperature Te is set to (Ts + 2) ° C. The operating temperature t ₁ is set to (Ts + 0.5) ° C and the stop temperature t ₂ is (Ts−0.5) ° C.
Is set to. The opening temperature t ₃ is set to (Ts + 2 + 0.5) ° C, the closing temperature t ₄ is set to (Ts + 2-0.5) ° C, and the temperature difference between each temperature t ₁ , t ₂ and t ₃ , t ₄ is 1 ° C. Is set. Specifically, in FIG. 4, Ts = 0 ° C.,
t ₁ = 0.5 ° C., t ₂ = −0.5 ° C., t ₃ = 2.5 ° C., t ₄ = 1.5 ° C., and the temperature inside the refrigerator is adjusted within the range where the object to be cooled does not freeze. This temperature control is performed only when the compressor 14 is energized, and the cold storage power of the cold storage agent 25 frozen during the movement of the refrigerating compartment 1 causes the temperature inside the compartment to be the temperature at which the energization is stopped. It is maintained for a certain period of time. Various cold storage capacities can be set by the cold storage capacity and amount of the cold storage agent 25, but with this structure, the time to keep the inside temperature at 0 ° C is about 6 hours at the outside air temperature of 30 ° C unless the door 2 is opened. I am trying.

The process until the cold storage agent 25 in the refrigerator 1 freezes will be described based on the internal temperature change response operation chart of FIG. t ₁ = 0.5
_{℃, t 2 = -0.5 ℃,} t 3 = 2.5 ℃, described as t ₄ = 1.5 ℃.

When the object to be cooled is stored in the storage A and the cold storage agent 25 freezes, it can be shipped and delivered as it is, and when the power is turned on,
Cooling operation starts. At the beginning of the operation, the inside A is at the same temperature as the outside air temperature, and if the object to be cooled is a cooled food, the inside A will be cooled by the food, but unless it is usually winter, It is about 20 ℃ in the summer. When the refrigerant compressor 14 is operated and the switchgear 21 is opened, the inside A is cooled by the inside cooler 17 and its temperature is lowered. Since the refrigerant flows through the cold storage agent freeze cooler 18, freezing of the cold storage agent 25 is also performed, but it does not greatly affect the lowering of the temperature of the inside A. When the temperature of the inside A lowers to 1.5 ° C. or less, the switchgear 21 is closed and the inside cooler 17 controls the inside A.
Cooling of the cold storage agent is stopped, and the cold storage agent of the cold storage agent 25 is frozen 18
Only the cooling by is performed. Although there is an indirect cooling of the cold storage A by cooling the cold storage agent 25, it does not occur so much when it becomes 1.5 ° C. or less, and its capacity is mainly used for cooling the cold storage agent 25. Therefore, the temperature of the inside A is 1.5
It takes about 2 hours from ℃ to stop the operation of the compressor 14 to -0.5 ℃, and the temperature of the inside A is -0.5 ℃.
Then, the compressor 14 is stopped. At this time, the cold storage agent 25 is 50%
It is frozen to some extent. When the operation of the compressor 14 is stopped, the inside temperature of the cold storage agent 25 rises due to a loss from the outside air temperature due to the cooling of that part and the heat insulation capacity of the heat insulating box body because the inside of the cold storage agent 25 is not frozen, and 0.5 When the temperature reaches ℃, the operation of the compressor 14 is started, and the cooling of the cold storage agent 25 is restarted. When the operation of the compressor 14 is restarted, the internal cold storage temperature decreases, and when it reaches −0.5 ° C., the compressor 14 stops again. At this time, the cold storage agent 25 is frozen by about 65%, and when the compressor 14 is stopped, the cold storage agent 25 is normally frozen by 100% in about 6 hours. Compressor 14 in the latter half
The stop time is long and the operation time is short. In this state, the operation is the same as a normal refrigerator, and the object to be cooled is stored without freezing. Therefore, it is not necessary to freeze the cold storage agent 25 and then perform recooling by storing the object to be cooled, as compared with the conventional case in which the object to be cooled is put.

When the opening / closing door 2 is opened / closed during the operation of the refrigerator 1, the cold air in the refrigerator A escapes, so that the temperature inside the refrigerator rapidly rises to about 10 ° C. as shown in FIG. When the opening temperature of the switchgear 21 exceeds the opening temperature t ₃ = 2.5 ° C. due to the rise in the internal temperature, the refrigerant is supplied to the internal cooler 17, and the direct cooling by the internal cooler 17 in the internal compartment A is restarted. Then, it is cooled to the set temperature Ts = 0 ° C. in a short time.

In the present invention, the cooling of the inside A and the cooling of the regenerator 25 can be individually controlled, while the inside A is maintained at the inside set temperature Ts,
The cold storage agent 25 can be frozen. By controlling so that the set temperature Ts in the refrigerator is maintained, the cool storage agent 25 can be frozen while the object to be cooled is stored without requiring a special time for freezing the cool storage agent 25. . Therefore, for example, a product scheduled to be shipped the next morning can be stored in the cooling box 1 the night before, so that the efficiency of the shipping operation can be improved, and the objects to be cooled can be stored in the cooling box 1 and the storage space is small. .

The power supply to the compressor 14 can be used as a long-term storage if it is carried out again at the delivery shop after transportation, and as a temporary storage until it is stored in a showcase if it is a supermarket. Since the power supply cord to the compressor 14 becomes a hindrance during transportation, a storage box for the power supply cord, a winding portion, a cord reel, etc. may be formed in the cooler 1.

(G) Effect of the Invention The present invention forms an internal cooler for cooling the inside of the cold storage and a cold storage agent freezing cooler for cooling the cold storage agent, and controls the supply of the refrigerant to the internal cooler by the opening / closing device. By controlling the switchgear and compressor with a predetermined temperature difference from the set temperature inside the refrigerator, the cold storage agent is cooled and frozen while the inside of the refrigerator is maintained at the storage temperature of the object to be cooled. Therefore, it is easy to use and can always be in a transportable state.

[Brief description of drawings]

FIG. 1 shows the present invention, FIG. 1 is a main part refrigeration cycle and electric circuit diagram, FIG. 2 is a sectional view, FIG. 3 is a perspective view, and FIG. 4 is an operation chart. 1 ... Cooling box, 2 ... Open / close door, 3 ... Insulation box, 4 ...
Machine room, 14 ... Compressor, 15 ... Condenser, 17 ... Inside cooler, 18 ... Regenerator freeze cooler, 21 ... Switchgear, 25 ...
Cooling agent, 27 ... Temperature detector, 28 ... Temperature discrimination control device.

Claims (1)

[Claims] 1. A heat-insulating box body having an opening / closing door for storing an object to be cooled, a cool storage material arranged in the heat-insulating box body, an inside cooler for cooling the heat-insulating box body, and a cool storage material for freezing the cool storage material. A freezing cooler, an in-compartment cooler and a cold storage material freezing cooler are connected in parallel, a refrigeration cycle consisting of a compressor, a condenser, and the like, and a refrigerant passage opening / closing device connected in series to the in-compartment cooler, A first temperature control device for controlling the operation of the compressor based on the difference between the set temperature in the refrigerator and the temperature in the refrigerator, and a second temperature control device which is higher than the set temperature in the refrigerator by a predetermined temperature.
A cooling box having a second temperature control device that controls opening / closing of the refrigerant flow path opening / closing device based on the difference between the set temperature and the internal temperature.