CN205482051U - Compound frozen machine of large -scale tunnel type compressor liquid nitrogen - Google Patents

Abstract

The utility model belongs to the technical field of food quick frozen, concretely relates to compound frozen machine of large -scale tunnel type compressor liquid nitrogen, cell body, cross -section are last lid, the compressor refrigerating unit of U -shaped structure under including, lower cell body on be equipped with the conveyer belt, go up the lid lid in the conveyer belt top, go up the lid and form the tunnel type structure with cell body down, the anterior segment of tunnel type structure, middle section, back period number put and are equipped with fan and axial fan, the well period number of tunnel type structure puts and still is equipped with liquid nitrogen dispersion sprayer, two sections still are equipped with multilayer finned evaporator around the tunnel type structure, and the tunnel type structure around two sections all be connected with compressor refrigerating unit, lower cell body and last lid between still be equipped with elevating system, still be equipped with intelligence control system on the lower cell body. The utility model discloses can realize higher refrigeration speed and lower refrigeration cost, and the ice crystal of quick -freeze is tiny, the cell wall of vegetables and fruits class food can not pricked during the quick -freeze.

Description

Large Tunnel Compressor Liquid Nitrogen Composite Quick Freezer

technical field

The utility model belongs to the technical field of food quick-freezing, in particular to a large-scale tunnel compressor liquid nitrogen compound quick-freezing machine.

Background technique

The existing food quick-freezers on the market mainly have two refrigeration modes. One is to use compressor refrigeration units for refrigeration, and the other is to use liquid nitrogen for refrigeration. The compressor refrigeration units are characterized by large equipment volume and low cost of quick-freezing, but refrigeration Slow speed and high dry consumption; liquid nitrogen refrigeration quick freezer is characterized by compact equipment, extremely fast refrigeration speed, and low dry consumption, but the refrigeration cost is two or three times higher than that of compressor refrigeration, and the refrigeration speed and refrigeration cost are serious constraints There are two important reasons for the application of quick-frozen food industry and the quality of the industry.

Contents of the invention

The utility model aims at the disadvantages of slow cooling speed or high cooling cost in the two refrigeration modes adopted by the food quick-freezing machine in the prior art, and provides a large-scale tunnel-type compressor liquid nitrogen composite quick-freezing machine. The cover forms a tunnel structure, the front and rear sections of the tunnel structure are connected to the compressor refrigeration unit, and the middle section of the tunnel structure is equipped with a liquid nitrogen dispersion injector, that is, the front and rear sections of the tunnel structure adopt compressor refrigeration mode, and the tunnel The middle section of the type structure adopts the liquid nitrogen injection refrigeration mode, and the mixed refrigeration of the two modes can achieve higher refrigeration speed and lower refrigeration cost.

The purpose of the invention of the utility model is achieved through the following technical solutions: a large-scale tunnel-type compressor liquid nitrogen composite quick-freezing machine, including a lower tank body, an upper cover body with a U-shaped cross-section, and a compressor refrigeration unit. There is a conveyor belt on the lower tank, and the upper cover covers the conveyor belt. The upper cover and the lower tank form a tunnel structure. Fans and axial fans are installed in the front, middle and rear sections of the tunnel structure. There is also a liquid nitrogen dispersing injector in the middle of the tunnel structure, as long as the liquid nitrogen dispersing injector is a device capable of spraying liquid nitrogen into the tunnel structure, the liquid nitrogen dispersing injector can be composed of a liquid nitrogen storage tank and It is composed of a pipeline with a nozzle, and the front and rear sections of the tunnel structure are also equipped with multi-layer finned evaporators, and the front and rear sections of the tunnel structure are connected to the compressor refrigeration unit; the lower tank body and There is also a lifting mechanism between the upper covers, and an intelligent control system is provided on the lower tank. The intelligent control system is composed of a touch screen, PLC module, frequency converter, frequency conversion motor, AC contactor, relay and temperature sensor.

As a preference, a polyurethane foam insulation layer is provided in the lower tank body. Both sides of the polyurethane foam insulation layer are welded with 304 stainless steel, that is, the structure of the lower tank body is 304 stainless steel, polyurethane foam insulation layer, and 304 stainless steel from outside to inside. The effect of thermal insulation, when the utility model is quick-frozen food, the polyurethane foam insulation layer can make the quick-freezing effect better and save more energy consumption.

As a preference, a polyurethane foam insulation layer is provided inside the upper cover. The structure of the upper cover from the outside to the inside is also 304 stainless steel, polyurethane foam insulation layer, and 304 stainless steel.

Preferably, the polyurethane foam insulation layer has a thickness of 150-200 mm. After many tests, the thickness of the polyurethane foam insulation layer reaches the standard within this range, and the occupied position and volume are also small. If the thickness is too small, it will easily lead to poor insulation effect, and if the thickness is too large, the volume of the utility model will increase. .

Preferably, the lifting mechanism includes a geared motor, a telescopic rod, a coupling, a transmission shaft, and a corner gear. The upper end of the lifting rod is connected to the upper cover, and the lower end of the lifting rod is connected to the lower tank. The lifting mechanism can adjust the distance between the lower tank body and the upper cover body, and the adjustment lifting mechanism can separate the lower tank body and the upper cover body by 500-800mm, so as to clean, maintain and maintain the utility model.

Preferably, the bottom of the lower tank is provided with several supporting feet. The supporting legs can separate the lower tank body from the ground. When the utility model is working, the impact of the ground temperature on the utility model can be reduced, and at the same time, the food to be quick-frozen can be prevented from being polluted by ground pollutants, which is more hygienic.

As a preference, the compressor refrigerating unit adopts a common compression refrigerating machine on the market, and the compressor refrigerating unit is composed of a compressor, an evaporator, a liquid receiver, an expansion valve, a separator, an expansion valve, etc., and a liquid nitrogen solenoid valve, a liquid nitrogen Nitrogen pipes and connections. All connecting pipes of the utility model need heat preservation treatment, and vacuum tubes or polyurethane foam heat preservation treatment are used to reduce liquid nitrogen or refrigerant loss.

Compared with the prior art, the utility model has the following beneficial effects: food quick-freezing is generally divided into three stages: 1. from normal temperature to 0°C, 2. from 0°C to -5°C, and 3. from -5°C to - 18°C. The core is that the largest ice crystal growth zone from 0°C to -5°C in the second stage must be cooled quickly. The ice crystal growth zone within 10CM is best passed within 30 minutes, and the ice crystal growth zone of 10-20CM is best in Pass within 1 hour, the ice crystals will be fine, and the cell walls of fruits and vegetables will not be punctured. The cooling speed of the first stage and the second stage does not require rapid cooling. The utility model adopts the refrigeration mode combining the compressor refrigeration mode and the liquid nitrogen refrigeration mode. The compressor refrigeration mode is adopted in the front section of the tunnel structure, and the liquid nitrogen refrigeration mode is used in the middle section of the tunnel structure for rapid freezing. The latter section adopts the compression refrigeration mode to continue to complete the subsequent quick freezing until the whole quick freezing is completed. Under the same amount of quick-freezing food, due to the existence of the intermediate liquid nitrogen quick-freezing area, the utility model has a better quick-freezing effect than the pure compressor quick-freezing line, smaller size, lower purchase cost, and because it only uses Liquid nitrogen quickly freezes the largest ice crystal growth zone in the middle section of the tunnel structure, and the two sections before and after the tunnel structure are pre-cooled and continued to cool with a compressor, saving about half of the cost of liquid nitrogen.

To sum up, the utility model can achieve higher cooling speed and lower cooling cost, and the quick-frozen ice crystals are small, and the cell walls of fruits and vegetables will not be punctured during quick-freezing.

Description of drawings

Fig. 1 is a structural representation of the utility model;

Marks in the figure: 1. Lower tank body, 2. Upper cover body, 3. Compressor refrigeration unit, 4. Conveyor belt, 5. Fan and axial fan, 6. Liquid nitrogen dispersion injector, 7. Multi-layer fins Type evaporator, 8. Lifting mechanism, 9. Intelligent control system, 10. Polyurethane foam insulation layer, 11. Geared motor, 12. Telescopic rod, 13. Coupling, 14. Transmission shaft, 15. Corner, 16 , Supporting feet.

detailed description

The utility model will be further described below in conjunction with the embodiment represented by accompanying drawing:

Example 1

As shown in Figure 1, a large-scale tunnel-type compressor liquid nitrogen compound quick-freezing machine includes a lower tank body 1, an upper cover body 2 with a U-shaped cross-section, and a compressor refrigeration unit 3. There is a conveyor belt 4, the upper cover body 2 covers the top of the conveyor belt 4, the upper cover body 2 and the lower tank body 1 form a tunnel structure, and the front, middle and rear sections of the tunnel structure are equipped with fans and axial fans 5. The middle section of the tunnel structure is also equipped with a liquid nitrogen dispersion injector 6, and the front and rear sections of the tunnel structure are also equipped with multi-layer finned evaporators 7, and the front and rear sections of the tunnel structure are refrigerated with compressors. The unit 3 is connected; the lower tank body 1 and the upper cover body 2 are also provided with a lifting mechanism 8, and the lower tank body 1 is also provided with an intelligent control system 9. The compressor refrigerating unit 3 adopts a general-purpose compression refrigerating machine on the market. All connecting pipes of the utility model need to be insulated, and vacuum tubes or polyurethane foaming are used to reduce liquid nitrogen or refrigerant loss.

The lower tank body 1 is provided with a polyurethane foam insulation layer 10 . Both sides of the polyurethane foam insulation layer 10 are welded with 304 stainless steel, that is, the structure of the lower tank body 1 is 304 stainless steel, polyurethane foam insulation layer 10, and 304 stainless steel from the outside to the inside; There is also a polyurethane foam insulation layer 10 inside, and the structure of the upper cover body 2 from outside to inside is also successively 304 stainless steel, polyurethane foam insulation layer 10, and 304 stainless steel. The thickness of the polyurethane foam insulation layer 10 is 180mm. The polyurethane foam insulation layer 10 plays the role of thermal insulation. When the utility model carries out quick-freezing of food, the polyurethane foam insulation layer 10 can make the quick-freezing effect better and save more energy consumption.

The lifting mechanism 8 comprises a reduction motor 11, a telescopic rod 12, a shaft coupling 13, a transmission shaft 14, and a corner gear 15. The upper end of the lifting rod 12 is connected to the upper cover 2, and the lower end of the lifting rod 12 is connected to Lower tank body 1. The lifting mechanism 8 can separate the lower tank body 1 from the upper cover body 2, so as to clean, maintain and maintain the utility model. The bottom of the lower tank body 1 is provided with supporting feet 16 . The supporting feet 16 can separate the lower tank body 1 from the ground. When the utility model is working, the impact of the ground temperature on the utility model can be reduced, and the food to be quick-frozen can be prevented from being polluted by ground pollutants, which is more hygienic.

The specific embodiments described herein are only examples to illustrate the spirit of the present utility model. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (6)

1. a large tunnel formula compressor liquid nitrogen is combined instant freezer, including lower groove (1), cross section is the upper cover body (2) of U-shaped structure, compressor cooling unit (3), it is characterized in that, described lower groove is provided with conveyer belt (4), upper cover body lid side on the conveyor belt, upper cover body forms tunnel structure with lower groove, the leading portion of tunnel structure, stage casing, rear fragment position is designed with blower fan and aerofoil fan (5), the middle section position of tunnel structure is additionally provided with liquid nitrogen dispersing ejector (6), before and after tunnel structure, two sections are additionally provided with multilamellar finned evaporator (7), and before and after tunnel structure two sections be all connected with compressor cooling unit；It is additionally provided with elevating mechanism (8) between described lower groove and upper cover body, lower groove is additionally provided with intelligence control system (9).

Large tunnel formula compressor liquid nitrogen the most according to claim 1 is combined instant freezer, it is characterised in that be provided with polyurethane foamed thermal-insulating layer (10) in described lower groove.

Large tunnel formula compressor liquid nitrogen the most according to claim 1 is combined instant freezer, it is characterised in that be provided with polyurethane foamed thermal-insulating layer in described upper cover body.

4. it is combined instant freezer according to the large tunnel formula compressor liquid nitrogen described in Claims 2 or 3, it is characterised in that the thickness of described polyurethane foamed thermal-insulating layer is 150 ~ 200mm.

Large tunnel formula compressor liquid nitrogen the most according to claim 1 is combined instant freezer, it is characterized in that, described elevating mechanism includes that reducing motor (11), expansion link (12), shaft coupling (13), power transmission shaft (14), gyrator (15) form, the upper end of telescopic rod is connected to upper cover body, and the lower end of telescopic rod is connected to lower groove.

Large tunnel formula compressor liquid nitrogen the most according to claim 1 is combined instant freezer, it is characterised in that be provided with some spikes (16) bottom described lower groove.