KR200215910Y1 - Rapid food freezer with closed cycle refrigerator and liquid nitrogen - Google Patents

Abstract

The present invention relates to a fast food freezer configured by mixing a freezer using a closed freezer and a freezer using liquid nitrogen, and the food is finally formed by the first cooling unit and the cold of liquid nitrogen which are first precooled by the freezing of the freezer. It consists of a secondary cooling unit that is frozen by the primary cooling unit and the secondary cooling unit is a bayonet is installed in the primary cooling unit, the male bayonet is installed in the primary cooling unit to be separated and assembled between each other. In the meantime, a gasket is installed to prevent leakage of the cold inside the freezer to the outside, and food is introduced into the primary cooling unit along the conveyor belt, forcibly precooled by a heat exchange system, and secondary cooling. When it flows into the part, the temperature inside the freezing chamber is maintained at low temperature by liquid nitrogen, and it is a tunnel-type freezer that is frozen by stirring of cold nitrogen gas. The present invention provides a mixed food quick freezing device having a lower installation cost and a smaller size and a lower operating cost than a liquid nitrogen type freezer.

Description

Rapid food freezer with closed cycle refrigerator and liquid nitrogen

The present invention relates to a food freezing device for rapidly freezing processed foods, and more specifically, precooling using a small-capacity closed freezer in the primary cooling unit, and final freezing using liquid nitrogen in the secondary cooling unit. It relates to a mixed food rapid freezing apparatus using liquid nitrogen.

Generally, two types of food freezing devices, which are used as equipment for rapidly cooling and freezing small processed foods and ice creams, are freezing devices using a closed freezer and freezing devices using liquid nitrogen. In case of freezing, each freezing device has advantages and disadvantages.

Firstly, the freezing device using a closed freezer includes a tunnel type where food is frozen as it passes through a tunnel along a conveyor belt and a spiral type that freezes as it moves along a spiral disc. It takes a large area and the cost of the equipment used to install the freezing device is very high disadvantage.

However, a freezing device using a closed freezer uses a lot of electrical energy, but the overall operating cost is about 10 to 20% cheaper than a freezing device using liquid nitrogen, which is expensive.

However, in order to generate a large amount of cold, the freezing capacity must be large, and a large amount of air convection is needed to effectively deliver the cold of the heat exchanger to food, so a large amount of freezing space is required for convection. It becomes bigger.

In addition, large-capacity freezers have a lot of failures and require careful maintenance compared to small-capacity freezers, and therefore large-capacity freezers have a high maintenance cost compared to small-capacity freezers.

If water from the outside comes into the freezing device during operation with the food is frozen in the heat exchanger there is a problem that the air used as the heat exchange refrigerant is unable to heat exchange with the heat exchanger. In order to prevent this, a large-capacity freezer has a problem of periodically performing rework to remove ice or defrost.

Secondly, the freezing device using liquid nitrogen is relatively smaller than the freezing device using a closed freezer, so the installation area may be smaller. It has a much cheaper advantage compared to the freezing device using.

However, since a freezing device using liquid nitrogen has a relatively high cost of freezing because liquid nitrogen is used as a refrigerant to freeze, many freezing device manufacturers package food before freezing. It is often put in the freezer has a problem of reducing the quality of food.

The present invention to solve the above problems, the present invention, in the fast food freezer to freeze the food rapidly to improve the quality and productivity of the frozen food, using a small capacity closed freezer and liquid nitrogen, It is an object of the present invention to provide a food rapid freezing device which is low in operating cost and easily made available to users.

The present invention, in order to achieve the above object, the present invention, after the pre-cooling for food using a small-capacity closed refrigerator in the primary cooling unit to cool and rapidly freeze small processed food, ice cream, etc. By finally freezing the food in the secondary cooling unit using nitrogen, it significantly reduces the capacity of the freezer, thereby reducing the consumption of electrical energy, making it easy to maintain and using a small amount of liquid nitrogen, thereby effectively reducing the overall operating cost. It is an object of the present invention to provide a closed freezer and a food rapid freezing device using liquid nitrogen that can freeze.

In addition, the present invention, the primary cooling unit for the pre-cooling generates a cold by using a small-capacity closed refrigerator, and transmits the cold to the heat exchanger installed on the inside, the fan is operated by a drive motor installed on the upper air heat exchange Passing through the machine gives a cold and collides with the food coming in through the conveyor belt and delivers the cold directly to the food. The primary cooling unit is composed of two freezing chambers, each of the cooling chambers is provided with one or two heat exchangers according to the capacity of the frozen food, and the temperature of the first chamber and the second chamber is maintained at about -30 ° C and -36 ° C, respectively. do.

The secondary cooling unit is supplied with liquid nitrogen through a pipe that penetrates from the outer lower portion to the inner lower portion, and the liquid nitrogen is supplied to an injection nozzle installed at the inner upper portion, and sprayed in the form of a mist from the injection nozzle to adjust the temperature of the freezing chamber. Dropping, the inside of the nitrogen gas is agitated by the inner fan fixed to the drive motor installed on the upper side to deliver the cold to the incoming food. The secondary cooling unit is divided into three freezing chambers, and the liquid nitrogen is supplied and injected only to the middle chamber located in the middle, and the first chamber and the third chamber are cooled by the cold nitrogen gas flowing from the second chamber. do. The temperature of each freezing chamber depends on the temperature of the second chamber. When the temperature of the second chamber is about -80 ° C, the temperatures of the first chamber and the third chamber are maintained at about -60 ° C and -50 ° C, respectively.

The primary cooling unit and the secondary cooling unit are provided with a female bayonet in the primary cooling unit and a male bayonet in the secondary cooling unit, so that the first cooling unit and the secondary cooling unit can be separated and assembled with each other. In between, a gasket is installed so that the gas inside the freezer does not leak to the outside.

1 is a view showing the overall appearance of the food rapid freezing apparatus of the present invention.

Figure 2 is a view showing in detail the primary cooling unit of the food rapid freezing apparatus of the present invention.

Figure 3 is a view showing in detail the secondary cooling unit of the food rapid freezing apparatus of the present invention.

<Brief description of symbols for the main parts of the drawings>

30: mixed food freezing device 32: frame

34: primary cooling unit 36: upper insulation case

38: lower insulation case 40,78: first freezing chamber

42,80: second freezing chamber 44: heat exchange system

46: female bayonet 48: flange

50: fan drive motor 52: housing

54 fan drive shaft 56 heat exchanger

58: circulation fan 60: gasket

64: insulation wall 68: curtain

70: nitrogen gas vent 72: stirring pan

74: secondary cooling unit 76: male bayonet

82: third freezing chamber 84: liquid nitrogen support plate

86: vacuum insulation pipe 88: liquid nitrogen injection nozzle

90 valve unit 92 conveyor belt

94: conveyor drive motor 96: conveyor belt gear

98: pressure buffer tank 100: temperature sensor

Hereinafter, with reference to the accompanying drawings will be described the configuration and operating state of the present invention.

1 is a view showing the overall appearance of the mixed food rapid freezing apparatus of the present invention, the mixed food freezing apparatus 30 is composed of a primary cooling unit 34 and a secondary cooling unit 74, the primary The female bayonet 46 of the cooling unit 34 and the male bayonet 76 of the secondary cooling unit 74 are integrally formed by mutual coupling in the longitudinal direction, and a conveyor system 92 is formed at the lower end of the inside. do.

The mixed food rapid freezing device 30 is a device incorporating a tunnel-type freezing device using a conventional closed type freezer and a tunnel-type freezing device using liquid nitrogen into a primary cooling unit 34 and a secondary cooling unit 74. Furnace, the mixed food rapid freezing device 30 has a structure that can effectively deliver cold to the food compared to the conventional tunnel-type freezer.

The primary cooling unit 34 and the secondary cooling unit 74 are formed to have a quadrangular structure that is closed by a heat insulating plate in order to insulate the outside of the room temperature and the inside of the low temperature, the primary cooling unit 34 ) And the secondary cooling unit 74 is placed on top of the frame (32).

The insulation plate is provided with an upper insulation case 36 and a lower insulation case 38, and left and right insulation cases and insulation doors, and inlets and outlets through which food is introduced into the front and rear surfaces.

Two freezing chambers are configured in the primary cooling unit 34. The first freezing chamber 40 and the second freezing chamber 42 are integrally formed, and each freezing chamber has a freezing capacity and a freezer of food. The number of heat exchange systems 44 is determined by the capacity of.

One heat exchange system 44 is composed of a circulation fan 58, a housing 52, and a heat exchanger 56 connected to a drive motor 50, and a conveyor belt 92 directly below the heat exchanger 56. Is installed. Each freezing chamber is provided with a curtain 68 at the top of the separation wall 64 and the conveyor belt 92 in order to suppress the mutual insulation and the flow of cold air.

The heat exchange system 44 circulates air to deliver the cold of the heat exchanger 56 to food. That is, the circulation fan 58 fixed to the drive motor 50 forcibly introduces air into the housing 52 and passes the air into the heat exchanger 56, where the air is cold from the heat exchanger 56. It is obtained, and the cold water is transmitted while colliding with the incoming food coming along the conveyor belt (92).

Here, the heat exchanger 56 receives cold from the closed freezer installed outside, and the air passing the cold passes through the lower end of the conveyor and is then transferred to the upper part to be introduced into the circulation fan 58.

In addition, the secondary cooling unit 74 has three independent freezing chambers, and each freezing chamber has a stirring fan 72 operated by a fan driving motor 50 installed on the upper end of the upper insulation case 36. ) Is installed and the upper heat insulating case 36 is provided with a valve unit 90 for controlling liquid nitrogen at the lower end.

The pipe constituting the valve unit 90 is connected to the injection nozzle 88 installed in the upper part of the second freezing chamber 80 through the heat insulating case 38 in the lower part of the second freezing chamber 42. The pipe is a line through which the liquid nitrogen is transferred, and the liquid nitrogen is supplied through the valve unit 90 from the cryogenic liquefied gas storage tank installed outside, and is injected in the form of a mist in the injection nozzle 88. The liquid nitrogen injection amount is determined in the temperature control panel by sensing the temperature of the second freezing chamber 80 and is supplied by a given amount to the valve of the valve unit 90. As the cold gas generated in the second freezing chamber 80 is transferred to the first freezing chamber 78, the temperature of the first freezing chamber 78 is lowered, and the third freezing chamber 82 is a portion of the supercooled food. Provides time for the cold to pass from the surface to the relatively hot core. The food which is pre-cooled in the primary cooling unit 34 on the conveyor belt 92 and then flows into the food is dropped by collision with cold nitrogen gas by a stirring fan.

Like the primary cooling unit 34, the secondary cooling unit 74 is provided with a heat insulating wall 64 and a curtain 68 between each freezing chamber to insulate each freezing chamber.

The mixed food freezing device 30 is a nitrogen gas vent 70 is installed to continuously discharge the nitrogen gas generated in the freezer to the outside, the conveyor drive motor 94 for driving a conveyor system is the secondary It is installed at the rear end of the cooling unit 74.

2 is a view showing in detail the primary cooling unit 34 of the mixed food freezing apparatus of the present invention. The first freezing chamber 40 and the second freezing chamber 42 of the primary cooling section 34 each have two heat exchange systems 44, each freezing chamber 40, 42 having one expansion. The temperature of the coolant drops by the valve and the coolant coolant is simultaneously supplied to the two heat exchangers 56, and the coolant passing through the heat exchanger 56 is collected in the pressure buffer tank 98, and the pressure buffer tank ( The refrigerant collected at 98 is then transferred back to the compressor.

3 is a view showing in detail the secondary cooling unit 74 of the mixed food rapid freezing device of the present invention, the secondary cooling unit 74 between the conveyor belt 92 of the second freezing chamber 80 When the liquid nitrogen support plate 84 is installed and the liquid nitrogen is injected, the liquid nitrogen is collected at the bottom of the lower case so that the liquid nitrogen is easily transferred to the first freezing chamber 78 to prevent the liquid nitrogen from being consumed.

The primary cooling unit is provided with a female bayonet on the right side of the drawing, which is assembled with the male bayonet 76 and the female bayonet installed on the left side of the secondary cooling unit 74, and the female bayonet and male The gasket 60 is installed between the bayonet 76 to prevent the outflow of gas. Where the female bayonet of the primary cooling unit is formed, a flange is formed on the outer circumference thereof so as to be in close contact with each other by using a bolt and a nut.

As can be seen from the configuration, the mixed food rapid freezing device 30 is to improve and mix the problems with the conventional food freezing device, the primary cooling unit 34 and the food, which is a closed freezing unit for pre-cooling food first And the secondary cooling unit 74, which is a liquid nitrogen freezing unit which freezes at a freezing temperature, and forms the structure in which the cold is not leaked from the primary cooling unit 34 and the secondary cooling unit 74. In addition, it is easy to install and dismantle by transporting the products manufactured at the factory since it is formed to be assembled and separated.

The mixed food rapid freezing device using the liquid nitrogen of the present invention is similar in size to the conventional freezing device for liquid nitrogen, but has a much smaller area and a lower cost than the conventional closed freezer, and uses liquid nitrogen. The problem of operating cost pointed out as a disadvantage of the freezing device is completely solved.

In addition, in the closed freezing apparatus, it is difficult to control the production amount because the production amount to be frozen is determined by the freezing amount of the freezer, but the mixed type freezing unit can arbitrarily control the amount of liquid nitrogen, thereby controlling the production amount.

The mixed food freezing device of the present invention is composed of two parts, and the equipment can be assembled and separated from each other in the factory and the field, so that workers can easily transport and install it compared to the conventional freezing device. Will do better.

In particular, the mixed food freezing device of the present invention is economical in terms of equipment cost and operation cost compared to a conventional freezer when freezing the same capacity, and even in a company having a relatively narrow place because the size is similar to a conventional freezing device for liquid nitrogen. It is possible to install it, so it can expect great development in the domestic food freezing market.

Claims (3)

In the tunnel food quick freezing device for freezing food rapidly, the primary cooling unit 34 for pre-cooling the frozen food using the cold of the closed freezer and the final freezing of the frozen food using the cold of liquid nitrogen Comprising a secondary cooling unit 74, and the interconnection of the primary cooling unit 34 and the secondary cooling unit 74 is configured to be assembled and separated using the bayonet (46, 76) In the primary cooling unit 34 and the secondary cooling unit 74, a conveyor belt 92 is installed therein and a curtain is installed at the inlet and the outlet of the freezer, so that no external fluid is introduced. Food quick freezing device. According to claim 1, wherein the primary cooling unit 34 is composed of one or more freezing chamber, each freezing chamber fan drive motor 50, circulation fan 58, housing 52, heat exchanger 56 At least one heat exchange system 44 is installed, and is configured to have a structure in which cold air passing through the heat exchanger can directly collide with food by minimizing the gap between the heat exchanger 56 and the conveyor belt 92. Mixed food quick freezer, characterized in that. The method of claim 1, wherein the secondary cooling unit 74 is composed of two or more freezing chambers, the liquid nitrogen injection nozzle 88 and each of the freezing chambers (78, 80, 82) by sensing the temperature automatically Mixed food quick freezing apparatus characterized in that the valve unit 90 and the control device for supplying the liquid nitrogen is mounted.