JPH08338678A - Refrigerating equipment - Google Patents

Abstract

PURPOSE: To provide refrigerating equipment which is capable of cooling and further freezing foodstuffs and insulating them in a frozen state to a satisfactory state and preferable in terms of their quality, and further, acceptable to a relatively small equipment area and easy to expand the equipment. CONSTITUTION: There are provided an electric type refrigerator 20 and a liquefied gas type refrigerator 1 in a freezer compartment 8 where there are provided a control means which controls the operation and shutdown both refrigerators respectively and a freezer compartment temperature detection mechanism 16 which detects the temperature in the freezer compartment and a memory means which stores a freezing temperature of frozen foodstuffs. There is also provided in the control means a freezing temperature passage freezing control means which operates the liquefied gas type refrigerator 1 in the case when the detected freezer compartment temperature is close to the freezing temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a freezing facility for freezing various foods in a freezer.

[0002]

2. Description of the Related Art As a refrigerating facility used for freezing a large amount of food at a time in a freezer, a freezer provided with a so-called electric refrigerator (vapor compression refrigerator),
Furthermore, a liquefied gas refrigerant such as liquefied carbon dioxide gas or liquefied nitrogen gas is introduced into the freezer from a liquefied gas source such as a cylinder, and is injected to cool the inside of the refrigerator. Some refrigerators are equipped.

[0003]

However, each of the above prior arts has the following drawbacks. Disadvantages of refrigeration equipment provided with an electric refrigerator This is because cooling the inside of the refrigerator by heat exchange between the refrigerant and the air in the refrigerator requires a considerable amount of time to lower the temperature to a predetermined temperature. Further, even if the temperature inside the refrigerator drops to a predetermined temperature, the food in the refrigerator is cooled by touching the chilled air, so the heat transfer coefficient during that period is poor, and the food is frozen satisfactorily and efficiently. Can not do it. Therefore, rapid freezing cannot be performed and it may be difficult to obtain a product having a preferable quality as a frozen food. Disadvantages of refrigeration equipment equipped with a liquefied gas refrigerator This is because liquefied gas, which is a refrigerant, is jetted from a nozzle and immediately vaporized, which cools food and freezes it by the cold heat of the gas. Is a consumable item, the freezing cost is higher than that of an electric refrigerator. Further, when the frozen food is kept cold for a long time, the cost is high, and when the liquefied gas is used up, there is a problem that it becomes a mere heat insulation container.

The above is the problem of the refrigerating equipment equipped with each refrigerator. Recently, the types and demands of frozen foods have rapidly increased, and each manufacturer has expanded the refrigerating equipment to cope with such a situation. However, in order to newly add a refrigerating facility equipped with either one of the refrigerators with the same configuration, the facility cost is high and a relatively large installation area is required. Therefore, it is often impossible to add equipment in a practical sense.

An object of the present invention is to solve the above-mentioned problems, and it is possible to satisfactorily cool foods, freeze them, and keep them cold in a frozen state, and also in terms of quality, a relatively small equipment area is required. The purpose is to obtain refrigeration equipment that can be easily expanded.

[0006]

To achieve this object, a first characteristic configuration of a refrigerating facility according to claim 1 according to the present invention is provided with equipment constituting a vapor compression refrigeration cycle, and is provided in a freezer. An electric refrigerator capable of freezing the provided freezing room using electricity as a power source, and introducing the liquefied gas from the liquefied gas source into the freezer and injecting the liquefied gas from a nozzle to freeze the freezing room A liquefied gas type refrigerator, each of the electric refrigerator and the liquefied gas type refrigerator, operation means, control means for controlling the operation stop, a freezer compartment temperature detection mechanism for detecting the temperature of the freezer compartment, And a storage means for storing a freezing temperature of a frozen object food to be frozen in the freezing room, the freezing room temperature detected by the freezing room temperature detection mechanism is in the vicinity of the freezing temperature The freezing temperature passes the freezing control means for operating operates said liquefied gas chiller is to provided to the control means. Further, in the refrigeration equipment of the first characteristic configuration of the present application, the nozzle is a flat nozzle that ejects the liquefied gas in a planar manner, and a forced circulation fan that induces a circulation flow in the freezing chamber is provided in the freezer. It is preferable that a diffusion injection surface of the liquefied gas, which is diffused and ejected in a planar manner from the flat nozzle, is disposed across the blowing direction of the forced circulation fan. This is claim 2.
It is the second characteristic configuration of the refrigeration equipment related to. The actions and effects thereof are as follows.

[0007]

In the refrigerating equipment equipped with the first characteristic configuration of the present application,
Both an electric refrigerator and a liquefied gas refrigerator are provided. Therefore, for example, the refrigeration equipment of the present application can be obtained by simply attaching the liquefied gas refrigerator to the existing electric refrigerator. Further, since the control means can be provided to independently control the operation / stop of the electric refrigerator and the liquefied gas refrigerator, the refrigerating capacity can be varied by selectively operating the refrigerator according to the refrigerating load. . Further, the freezing room temperature detection mechanism detects the freezing room temperature. Further, this equipment is provided with a storage means, and the freezing temperature of the food to be frozen is stored in this storage means. Then, the liquefied gas refrigerator is operated by the freezing temperature passage freezing control means when the temperature of the freezing chamber is near the freezing temperature. Therefore, in the refrigeration equipment of the present application, liquefied gas type refrigeration is performed at the time when the food passes the freezing temperature when the refrigeration operation is performed. As a result, for example, when the food is cooled to near the freezing temperature and kept cold in the frozen state by the electric refrigerator, and the freezing temperature passage refrigeration control means freezes the liquefied gas refrigerator, the consumption of the liquefied gas is reduced. Good cooling, freezing and storage can be continuously performed with the amount kept to a minimum. That is, in the refrigeration equipment of the present application, the electric refrigerator that can be operated economically and the merits of the liquefied gas refrigerator that can supply a large amount of cold heat in a short time according to the load are respectively adopted to freeze various foods. On the other hand, it becomes possible to perform the refrigerating operation while making the optimum cooling rate compatible with the economical efficiency.

Further, in the refrigerating equipment having the second characteristic constitution of the present application, by providing the forced circulation fan in the freezer, the forced circulation fan induces the circulation flow circulating in the freezing chamber. A flat nozzle is used as a nozzle for liquefied gas injection provided in the liquefied gas refrigerator. From this nozzle, the liquefied gas is diffused and ejected in a planar manner. Then, the surface of this diffusion injection is set to be a direction transverse to the blowing direction of the forced circulation fan. Therefore, the liquefied gas blown out from the nozzle is further diffused in the circulating flow direction in the diffused state and circulates in the freezing chamber. Therefore, the positional relationship between the forced circulation fan and the diffusion injection surface can be tightly narrowed, the liquefied gas can be sprayed in a relatively narrow space with sufficient and even diffusion, and the cooling by the liquefied gas can be effectively performed. , Can be frozen.

[0009]

Therefore, for example, it becomes possible to suppress the amount of liquefied gas required for freezing to only the amount required for freezing the water content of the food to be frozen, and to control the speed of passing through the maximum ice crystal formation zone by the liquefied gas method. It can be accelerated as well as when using only a refrigerator, and the quality of food can be improved. result,
Cooling and freezing of foods, and moreover, cooling in a frozen state can be performed satisfactorily and economically, and in terms of quality, it is possible to perform a desired freezing operation in a relatively small equipment area. We were able to obtain a refrigeration facility that is capable and easy to expand.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An example of the refrigerating equipment of the present invention will be described below with reference to the drawings. FIG. 1 is a system explanatory view showing the configuration of the main part of the refrigeration equipment of the present invention. In the figure, reference numeral 3 is a food freezer, 8 is a freezer compartment, 20 is an electric refrigerator (vapor compression refrigerator), and 1 is a liquefied gas refrigerator (injection refrigerator). The electric refrigerator 20 of this example is already installed in the freezer 3. Further, FIG. 2 shows a front view of this equipment.

The electric refrigerator 20 includes an evaporator 33 and a compressor 3 which are components of a vapor compression refrigeration cycle.
0, condenser 31, pressure sensor (not shown), expansion valve 3
5 and the liquid receiving tank 32 and the like, and a piping system through these. Here, as shown in the figure, the evaporator 33 and the expansion valve 35 are inside the freezer 3, and the other parts are inside the freezer 3.
Installed outside. The evaporator 33 is provided with an evaporator fan 34. This evaporator fan 34
Is configured so that it can be operated independently of other devices provided in the electric refrigerator 20 in conjunction with the operation of the liquefied gas refrigerator 1. By adopting this configuration, it is possible to operate the evaporator fan 34 during operation of the liquefied gas refrigerator 1 and solve the problem of liquefied gas sticking to the evaporator 33.

The liquefied gas refrigerator 1 is newly added to the freezer 3 having the electric refrigerator 20.
As shown in FIG. 1, a nozzle 4, a liquefied gas cylinder 2 as a liquefied gas source, a liquefied gas supply pipe 7, a liquefied gas introduction pipe 6, a solenoid valve 5, a liquefied gas bypass pipe 9, a safety valve 10, a forced circulation fan 12 and the like are provided. Is configured. Of these, the nozzle 4, the liquefied gas introduction pipe 6, and the forced circulation fan 12 are the freezer 3.
It is installed inside, and other than that is installed outside the freezer 3. The forced circulation fan 12 is configured so that it can operate in conjunction with the operation of the electric refrigerator 20. That is, even when, for example, only the electric refrigerator 20 is operated to cool food to a temperature near the freezing temperature, the fan 1
2 is driven. In this cooling process, the food is mainly cooled at a temperature equal to or higher than the freezing point, and the temperature difference corresponding to the driving force of heat transfer can be sufficiently secured. Therefore, the effect of increasing the heat transfer coefficient with the increase in the air flow velocity by the forced circulation fan 12 is achieved. It is possible to rapidly cool a food having a large temperature and a high initial temperature to near the freezing temperature (freezing point). The nozzle 4
Is composed of a flat nozzle for injecting liquefied gas in a plane shape. The diffusion injection surface of the liquefied gas (specifically, nitrogen) diffused and ejected in a plane shape by this plane nozzle is It is configured to traverse the blowing direction. Specifically, in FIG. 1, the liquefied gas is jetted from the back side to the front side (left side to right side in FIG. 2) in the front and back direction of the paper, and is diffused and jetted into a plane having a width in the vertical direction of the paper. .

An exhaust port 13 is provided on the wall surface of the freezer 3, and an electric exhaust damper 14 is provided at the exhaust port 13. The electric exhaust damper 14 opens and closes in conjunction with the solenoid valve 5 provided in the liquefied gas refrigerator 1. As will be described later, by adopting this configuration, the consumption amount of liquefied gas can be reduced. Furthermore, the freezer compartment 8
A temperature sensor 16 forming a freezing room temperature detecting mechanism is installed at the center of the right side surface of the inside and half the height of the freezing room 8. The temperature sensor 16 detects the temperature of the freezer compartment 8.

For operation control of the electric refrigerator 20 and the liquefied gas refrigerator 1, as shown in FIG.
00 is provided. This has a built-in sequence controller 101 as a control means, and the electric refrigerator 2
0 and the operation and stoppage of the liquefied gas refrigerator 1 are freely selected and controlled. The control by the sequence controller 101 has priority over the operation of the operation changeover switch 111 and the cooling switch 112 described below, and according to the procedure stored in the sequence controller 101, both the refrigerators 1 and 20 are selectively or in a combined state. It is possible to drive at the same time. Naturally, it is possible to control the operation start temperature, the stop temperature, the operation time, etc. in each refrigerator. Furthermore, the sequence controller 101
Is provided with a storage unit 102 including a memory that stores the freezing temperature of the frozen food to be frozen.
In this memory, the freezing temperature (freezing point), which is necessary when the food to be frozen is frozen by the liquefied gas refrigerator 1,
The processing time, the processing start temperature, the processing stop temperature, and the like are stored, and these pieces of information can be written and changed. From this memory, appropriate information can be given to the freezing temperature passage refrigeration control means 103 which is the control software described later. That is, when the freezing room temperature detected by the temperature detection sensor 16 forming the freezing room temperature detecting mechanism is in the vicinity of the freezing temperature, the freezing temperature passage freezing control means 103 for operating the liquefied gas refrigerator 1 is operated. It is stored in the sequence controller 101 as the above-mentioned control means. Regarding the operation of the existing electric refrigerator 20, the sequence controller 101 controls a power source (not shown) of the electric refrigerator 20, a door heater power source (not shown), and a power source of the evaporator fan 34. . On the other hand, regarding the operation of the liquefied gas refrigerator 1, the temperature controller 15,
The solenoid valve 5, the forced circulation fan 12 in the refrigerator, and the electric exhaust damper 14 are controlled.

In the operation panel 110 provided for the operation operation panel 100, the operation changeover switch 111 of each of the refrigerators 1 and 20, the cooling switch 112, and the first operation time control of the liquefied gas refrigerator 1 are controlled. Timer 113,
A second timer 114, various alarm lamps 115, and a buzzer 1 for controlling the initial operation time of the electric refrigerator 20 in the combined operation of the liquefied gas refrigerator 1 and the electric refrigerator 20.
16, a liquefied gas pressure gauge 11 and the like are provided.

The liquefied gas refrigerator 1 starts its operation when the operation changeover switch 111 of the operation control panel 100 is in the liquefied gas type position and the cooling switch 112 (operation switch) is pushed. However, the operation is also possible in which the instruction from the sequence controller 101 gives priority to these switches. When you start driving,
The temperature sensor 16 detects the temperature inside the refrigerator, and if it is equal to or higher than the temperature set by the temperature controller 15, the electromagnetic valve 5 is opened and the liquefied gas is introduced into the freezer compartment 8 through the liquefied gas introduction pipe 6. The liquefied gas that has flowed in is vaporized by the nozzle 4, exchanges heat with the air in the refrigerator, and is cooled. Further, at the same time when the solenoid valve 5 is opened, the electric exhaust damper 14 is opened, and the exhaust gas after the liquefied gas is vaporized and heat-exchanged is exhausted through the exhaust port 13 to the freezer 3.
Discharge to the outside. When the internal temperature reaches the set temperature of the temperature controller 15, the first timer 113 for liquefied gas is activated,
The liquefied gas is controlled by opening and closing the solenoid valve 5 so that the temperature inside the refrigerator is kept at the temperature set by the temperature controller 15 for the time set by the first timer 113, and the temperature inside the refrigerator is accurately controlled.
On the other hand, when the electromagnetic valve 5 is closed at the time of introducing the liquefied gas, the electric exhaust damper 1 is provided so as not to let the cold air in the freezer compartment 8 escape.
A configuration is adopted in which the exhaust port 13 is closed by closing 4 to save energy. Further, as a closing time of the electric exhaust damper 14, a delay mechanism considering the time until the liquefied gas accumulated in the liquefied gas introduction pipe 6 (the one between the solenoid valve 5 and the nozzle 4) is completely exhausted (Fig. (Not shown) is provided to prevent the pressure inside the freezer compartment 8 from increasing due to vaporization of the remaining liquefied gas. Further, the safety valve 10 provided in the liquefied gas refrigerator 1 is provided inside the liquefied gas supply pipe 7 between the liquefied gas cylinder main valve and the solenoid valve 5 when the main valve (not shown) of the liquefied gas cylinder 2 is closed. In order to prevent damage and malfunction of the Bourdon tube type pressure gauge 11 and the solenoid valve 5 when the liquefied gas accumulated in the gas is vaporized to a high pressure, the safety valve 10 is opened and liquefied when the pressure exceeds a predetermined pressure. It is introduced into the freezing chamber 8 through the gas bypass pipe 9 and plays a role of reducing the pressure of the liquefied gas in the liquefied gas supply pipe 7.

The electric refrigerator 20 is operated when the operation changeover switch 111 of the operation control panel 100 is electric and the cooling switch 112 (operation switch) is pushed. However, an operation in which the instruction from the sequence controller 101 has priority over these switches is also possible. When the operation is started, as is well known in the art, a device forming a vapor compression refrigeration cycle operates, and a circulation flow formed in the freezer 3 by the evaporator fan 34 and heat exchange between the evaporator 33 cause the circulation flow. Can be cooled.

In the refrigerating equipment 1 of the present application, two kinds of refrigerating operation methods can be selected. That is, the first refrigerating operation method is a method of sequentially operating and refrigerating each refrigerator such as an electric type, a liquefied gas type, and an electric type, and the other one is a method using both an electric type and a liquefied gas type. Is. In the case of automatic operation, cooling, freezing, and cold keeping can be automatically performed by inputting an operation procedure into the sequence controller 101 described above.

First, the first refrigerating operation system will be described in detail. This first freezing operation method is a freezing method used when the food to be frozen has a high temperature and a temperature considerably higher than the freezing point. First, the electric refrigerator 20 is operated to cool the food to near the freezing temperature (freezing point). Then, the cold heat required to pass the freezing temperature thereafter is supplied by the liquefied gas type refrigerator 1 to perform freezing rapidly. Operation of the liquefied gas refrigerator 1 is started and stopped by the above-mentioned freezing temperature passage refrigeration control means 10
3 is performed on the basis of temperature and time from the start of operation. At this time, depending on the food, the freezing temperature may be controlled by the electric refrigerator 2.
Since the temperature may be set lower than the boiling point of the refrigerant of 0, the operation of the electric refrigerator 20 is stopped in advance. However, the evaporator fan 34 is continuously operated in order to cope with the low temperature during the operation of the liquefied gas refrigerator 1, and the sticking is prevented. Further, since the operating time of the liquefied gas refrigerator 1 at this time varies depending on various foods, the relationship between the core temperature and the holding time of the foods is obtained in advance in a preliminary freezing experiment or the like and stored in the storage means 102. Every 1st timer 1
Set 13 to that time. Then, when the set time of the first timer 113 ends, the operation of the electric refrigerator 20 is restarted, but when the temperature inside the freezer compartment 8 at this time is equal to or lower than the boiling point of the refrigerant of the electric refrigerator 20, or when there is an abnormality. If there is, a pressure switch (not shown), which is one of the safety switches of the electric refrigerator 20 itself, works, and the electric refrigerator 20
Does not work. When the cold heat in the freezer compartment 8 is used for heat dissipation and other over-freezing of food, and the temperature in the freezer compartment 8 rises, the electric refrigerator 20 operates and the frozen food storage operation is performed.
By adopting such a refrigeration system, the amount of liquefied gas required for freezing can be suppressed to only the amount required for freezing the water content of the frozen object, and the speed of passing through the maximum crystal formation zone is
As in the case of using only the liquefied gas refrigerator 1, the speed can be increased, and the quality of frozen food can be improved.

The operation of the forced circulation fan 12 in the case of adopting this refrigeration system will be described. At the initial operation of the electric refrigerator 20, the forced circulation fan 12 provided in the liquefied gas refrigerator 1 is operated. Therefore, the heat transfer coefficient is improved and rapid cooling is possible. On the other hand, when storage refrigeration is started after freezing, only the evaporator fan 34 is operated in the same manner as the normal electric refrigerator 20 is operated.

The above is a description of the structure of the main part of the refrigeration equipment of the present application and the main operation system thereof.
The actual operating state will be described. The outline of the refrigeration equipment used in the implementation and the outline of the foods to be frozen are listed in Table 1.

[0022]

[Table 1] Refrigerator equipment capacity Freezer compartment capacity 350 liters Food receiving rack 75 aluminum trays 430 mm deep and 450 mm wide
Equipped with 14 stages at mm intervals Electric refrigeration functional power Nominal 1100W Refrigerant R-22 Food related foods to be frozen 45 g of bread dough before fermentation, 43 pieces per aluminum tray are filled, and a total of 14 in the freezer 602 in steps
Pieces of dough were filled. Total filling amount is 27.09kg by weight

The operation status will be described below. 1 No-load operation (operation without freezing food) Fig. 3 shows the relationship between the elapsed time and the temperature in the refrigerator when the electric refrigerator alone or the liquefied gas refrigerator alone is operated without load. As can be seen from the result, it takes 2 hours and 30 minutes even if no load is applied to lower the temperature of the freezing chamber from room temperature (20 ° C) to -40 ° C only by operating the electric refrigerator. On the other hand, the liquefied gas type can cool the freezing chamber in a little over 4 minutes, and the cooling rate of the freezing chamber can be obtained in about 1/40 hours of the electric type.

2 Alternate operation of both refrigerators accompanied by freezing of foods The results of freezing the above-mentioned bread dough before fermentation using each refrigerator are shown in FIG. In this example, the freezing chamber is previously set to -4.
It was cooled to 0 ° C., and once the operation was stopped, the aluminum tray was quickly filled in the freezing compartment to start the freezing operation. From the start to 24 minutes, the electric refrigerating machine and the circulation fan are commonly used, and after that, the liquefied gas refrigerating machine is independently operated. A temperature sensor was attached to the center of the bread dough located in the center in the aluminum tray of 1, 4, 7, 10, and 14 stages from the top of the freezer to measure the core temperature. As can be seen from the figure, it takes about 4 minutes for the average core temperature of the dough to pass the freezing point of -7 to -8 ° C, which is the same as the liquefied gas type,
The superfreezing temperature of 10 ° C was only 32 minutes. The liquid nitrogen consumption at this time was about 12.5 kg, and freezing was possible with the consumption amount of 2/3 when only the liquefied gas refrigerator was used. Here, for freezing, in the actual machine operation, the operation during the freezing zone from 26 minutes to 30 minutes is sufficient. 3 Operation of Electric Freezer Alone with Freezing of Foods The result of freezing the dough before fermentation similar to the above example with only the electric freezer is shown in FIG. In this example, the freezing compartment is cooled to -40 ° C in advance before freezing, the operation of the electric refrigerator is stopped, and then the aluminum tray filled with the bread dough is quickly filled into the freezing compartment to start the freezing operation. did. The core temperature was also measured as in the above example. As can be seen from the figure, it takes about 20 minutes for the average core temperature of the bread dough to pass through the freezing point of -7 to -8 ° C, and it takes 70 minutes to reach the superfreezing temperature of -10 degrees.

4 Operation of Liquefied Gas Type Refrigerator Alone with Freezing of Foods The result of freezing the dough before fermentation similar to the above example only with the liquefied gas type refrigerator is shown in FIG. In this example, the freezing is performed from the completely stopped state, and the freezing room temperature is the same as the outside air temperature. In this state, the aluminum tray was quickly loaded into the freezing compartment and the freezing operation was started. The core temperature was also measured as in the above example. As can be seen from the figure, the average core temperature of the bread dough is very fast, about 4 minutes, before passing through the freezing point of -7 to -8 ° C, and it is only 1 at the superfreezing temperature of -10 ° C.
It was 8 minutes. The amount of liquid nitrogen consumed at this time was about 19 kg, but the amount of liquid nitrogen consumed can be reduced by cooling the freezing chamber in advance. Further, the rate of reaching the set temperature of -40 ° C is the same 4 minutes as when no load is applied, and the set temperature can be rapidly cooled regardless of the load amount. As can be seen from this result, the production capacity of frozen foods can be increased by about four times that of electric refrigerators. Furthermore, the speed of passing through the freezing point is about 5 times faster than that of the electric type, and frozen foods with excellent quality can be obtained.

In the above example, electric type and liquefied gas type cooling, freezing, and cold keeping were selectively performed by alternately operating two kinds of refrigerators. Depending on the case, both methods can be applied simultaneously. An example of such a case will be described below. In this second refrigerating operation method, the electric refrigerator 20 is always operated, and when passing through the maximum ice crystal production zone of food, the liquefied gas refrigerator 1 is simultaneously operated and the temperature zone thereof is rapidly increased. When the food is superfrozen after that, the electric refrigerator 20 is only operated. Foods to be frozen that can be applied to such a system include liquid frozen products (bag soups, etc.) having a low initial temperature and a thin frozen product. In this case, since the heat transfer area of the food itself is large and it is not necessary to lower the set temperature in the liquefied gas refrigerator 1 to the set temperature of the electric refrigerator 20 or less, the electric refrigerator 20 is always operated. The liquefied gas refrigerator 1 can be operated at the same time near the freezing temperature to perform freezing with the amount of liquefied gas suppressed as much as possible.

As described above, when the electric type and the liquefied gas type are used together,
The production amount of frozen foods can be increased about twice as much as that of electric refrigerators, and since the speed of passing through the freezing point (temperature) can be the same as that of liquefied gas type, the quality is good and the liquid nitrogen consumption is Can be reduced. In other words, it was possible to obtain a refrigeration facility capable of improving the refrigeration capacity, improving the quality, and reducing the refrigeration cost.

Furthermore, during operation of the liquefied gas refrigerator 1,
By linking the exhaust damper 14 with the operating state of the solenoid valve 5,
The effect of preventing the cold air in the freezer compartment 8 from escaping from the exhaust port will be described below by the inventors' examination. The inside of the freezing compartment 8 was emptied, the inside of the freezing compartment 8 was kept at the same temperature as the outside air temperature, and the liquefied gas refrigerator 1 was operated from that state. In operation, the state where the electric exhaust damper 14 is fully opened (described as a fully open type) and the opening and closing in conjunction with the solenoid valve 5 as described above (when the solenoid valve 5 is open, the electric exhaust damper 14 is open, and when it is closed, it is closed). (However, as described above, the closing operation of the damper 14 is performed with some delay), and the liquid nitrogen consumption amounts in the state (described as an open / close type) were compared.
FIG. 7 shows the changes in the internal temperature and the liquid nitrogen consumption in these cases. As can be seen from FIG. 7, when the freezer compartment 8 is kept at the set temperature of −40 ° C. for 40 minutes and the electric exhaust damper 14 is fully opened, 15.2 kg of liquid nitrogen is consumed, and the electric exhaust damper is consumed. When 14 is opened and closed in conjunction with the solenoid valve 5, the amount of liquid nitrogen is as small as 14 kg and 1.2 kg. That is, by opening and closing the electric exhaust damper 14 in conjunction with the electromagnetic valve 5, it is possible to prevent a heat loss corresponding to 30 g of liquid nitrogen per minute.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a system explanatory view showing a configuration of a main part of a refrigeration facility of the present invention.

[Figure 2] Front view of refrigeration equipment

FIG. 3 is a diagram showing changes in the temperature inside the refrigerator in an unloaded state.

FIG. 4 is a diagram showing a temperature inside the refrigerator, a dough core temperature, and a liquid nitrogen consumption amount when the combined operation is performed.

FIG. 5 is a temperature inside the refrigerator when only the electric refrigerator is operated,
Diagram showing the dough core temperature

FIG. 6 is a diagram showing the internal temperature, bread dough core temperature, and liquid nitrogen consumption when only the liquefied gas refrigerator is operated.

FIG. 7 is a diagram showing the temperature inside the refrigerator and the amount of liquid nitrogen consumed when the opening and closing of the exhaust port is controlled and when the exhaust port is maintained in the fully opened state.

[Explanation of symbols]

 1 Liquefied Gas Refrigerator 3 Freezer 4 Nozzle 8 Freezing Chamber 16 Freezing Chamber Temperature Detection Mechanism 20 Electric Refrigerator 101 Control Means 102 Storage Means 103 Freezing Temperature Passage Refrigeration Control Means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takaaki Asakura 1-4-2 Kyomachibori, Nishi-ku, Osaka City, Osaka Prefecture Liquid Gas Co., Ltd.

Claims (2)

[Claims] 1. A freezer compartment (8) provided with equipment constituting a vapor compression refrigeration cycle and provided in a freezer (3).
Is an electric refrigerator (2
0) and a liquefied gas refrigerator (1) capable of freezing the freezing chamber (8) by introducing the liquefied gas from the liquefied gas source into the freezer and injecting the liquefied gas from the nozzle (4). A control means (101) for controlling the operation and shutdown of the electric refrigerator (20) and the liquefied gas refrigerator (1) separately, and a refrigerating compartment temperature for detecting the refrigerating compartment temperature. A detection means (16), and a storage means (102) for storing a freezing temperature of a frozen food to be frozen in the freezing room (8), and the freezing room temperature detection mechanism (16) detects the freezing temperature. The freezing temperature passage refrigeration control means (103) for operating the liquefied gas type refrigerator (1) when the temperature of the freezing chamber is near the freezing temperature, the control means (101)
Refrigeration equipment in preparation for. 2. The freezer (3) is provided with a forced circulation fan (12) for inducing a circulating flow in the freezing chamber (8), wherein the nozzle (4) is a flat nozzle for injecting the liquefied gas in a planar manner. The refrigerating equipment according to claim 1, wherein a diffusion injection surface of the liquefied gas, which is provided inside and is diffused and ejected in a planar manner from the flat nozzle, is arranged across the blowing direction of the forced circulation fan.