JP2003148841A - Method and device for making slurry ice - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for making slurry ice by efficiently and continuously separating ice layers composed of ice crystal deposited on a heat conductive face of an inner face of an inner cylinder of a double cylinder, to stably and continuously make the ice friendly to the environment by applying the direct expansion-type cooling method using only a small amount of refrigerant, or applying the indirect cooling by a low temperature brine. SOLUTION: This slurry ice making machine forming a slurry ice making device is provided with the double cylindrical vessel 11 composed of the inner cylinder 17 for depositing ice crystal from an aqueous solution, an outer cylinder 18 forming a jacket-type channel 16 where the cooling medium for making the ice crystal flows, with the inner cylinder 17, a pressing roller for forming and separating a thin ice layer by the ice crystal deposited on the heat conductive face 17a of the inner cylinder 17, a pressing and separating means 15 composed of a rotary frame 13 supporting the roller 12 and being rotated in the inner cylinder, and a driving part 14a for rotating the rotary frame 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a slurry produced by cooling an aqueous solution containing an antifreeze to produce a slurry ice which is mainly used for storing heat, high-density heat transport, freezing and separating an aqueous solution, and storing fresh fish. The present invention relates to an ice making method and an ice making device.

[0002]

2. Description of the Related Art As an ice making device for slurry ice, a proposal relating to the device is disclosed in, for example, Japanese Patent Publication No. 44-29028. As shown in FIG. 8, the schematic structure thereof is such that a coolant flow path is provided inside an outer pipe 51 in which a coolant is circulated, and an inner pipe 50 through which an ice-making aqueous solution is circulated is disposed inside the coolant flow passage. A rotor 53 having a plurality of blade-shaped scraping members 55 that are constantly in contact with the ice-making surface generated on the inner surface of the inner pipe 50 is provided, and the ice-making inside the inner pipe 50 is performed by the refrigerant inside the outer pipe 51. The aqueous solution is cooled to generate ice, and the ice is forcibly scraped by the blade-shaped scraping member 55 of the rotating body 53.

The blade-shaped scraping member 55 is swingable toward the outside on the front side in the rotating direction of the rotating body by directing the tip end portion thereof in the rotating direction of the rotating body (direction of arrow A). When the rotating body rotates, the tip of the blade-shaped scraping member bites into the ice making surface of the inner pipe to scrape the ice.

The scraping method is well known as a scraping surface heat exchanger for cooling and heating a slurry containing a highly viscous fluid and solid particles. Also, in the cooling method, a method of using a large amount of refrigerant such as a refrigerant full liquid type or a liquid pump type is used in order to make the heat flow rate constant over the entire ice making surface.

[0005]

The slurry ice making device according to the prior art has the following problems. a. In the conventional blade-shaped scraping member, the blade-shaped cutting edge is set to scrape the ice by making it bite into the ice making surface of the inner pipe. Therefore, a large load is applied to the rotating body during the scraping operation. When the ice making operation is performed, the scraping power becomes large and the motor for driving the rotating body is overloaded under the operation condition where the amount of ice making is large. b. If continuous ice making is performed under the above conditions, the frictional resistance between the blade-shaped scraping member and the ice making surface is large, and the blade may be worn at the contact surface and the durability of other members may be impaired. is there. c. When a large amount of refrigerant is used for cooling, environmental problems are caused when fluorocarbon is used, and safety such as flammability becomes a problem when natural refrigerant such as ammonia or hydrocarbon is used. Further, in the refrigerant full type or the liquid pump type, there is a high possibility that refrigerating machine oil stays in the refrigerant passage and the cooling performance is deteriorated during long-term use.

The present invention has been made in view of the above problems, and efficiently peels and continuously spreads an ice layer formed of ice crystals deposited on the heat transfer surface of the inner surface of the inner cylinder of the double cylinder. Aims to provide a stable ice-making method for environment-friendly slurry ice by using a direct expansion type cooling method that requires a small amount of refrigerant or indirect cooling with low-temperature brine, and to provide an ice-making device therefor. Is.

[0007]

Therefore, in the method for making slurry ice of the present invention, an aqueous solution containing an antifreeze liquid is circulated in an inner cylinder of a double cylinder, and a flow path provided between the inner cylinder and the outer cylinder is provided. In the ice making method of receiving cold heat from the inside of the inner cylinder to precipitate ice crystals on the heat transfer surface of the inner cylinder, the pressing movement of the roller parallel to the inner cylinder axis to the ice crystal precipitation surface and the movement thereof Slurry ice is generated by generation of an ice layer due to rolling of the roller and separation of the ice layer due to negative pressure generated on the back surface of the roller due to the rolling.

In the method for making slurry ice of the present invention described above, an aqueous solution containing an antifreeze solution is used, and only water in the aqueous solution is cooled by a cooling medium to precipitate ice crystals, and the deposited ice crystals are removed from the heat transfer surface. It relates to an ice making method of slurry ice that is separated and taken out with an aqueous solution to obtain slurry ice, and along with a heat transfer surface of the inner surface of the inner cylinder, a roller parallel to the inner cylinder axis is pressed and moved. Due to the rolling of the rollers,
An ice layer is formed on the heat transfer surface, a negative pressure is formed on the back surface of the roller by the rolling, and the ice layer is separated from the heat transfer surface by the negative pressure to generate slurry ice. In other words,
By the above-mentioned generation method, only water is precipitated as an ice crystal from an aqueous solution containing an antifreeze solution, a thin ice layer is formed by rolling contact of a roller that press-moves the precipitated ice crystal, and a negative pressure on the roller back surface immediately after formation. It is peeled off from the precipitation surface to prevent the accumulation of ice crystals on the precipitation surface and enables stable continuous ice making. Further, the formed slurry ice can obtain a medium having high heat transfer performance without causing bridging.

Further, it is preferable that the cold heat is subjected to direct expansion type cooling by an evaporated refrigerant gas generated via an expansion valve of a cold heat source.

The above-mentioned invention specifies the cooling method used in the method for making slurry ice according to the present invention. The vaporized refrigerant gas generated through the expansion valve of the cold heat source is supplied to the cold heat supply passage in a double cylinder. The refrigerant is supplied between the inner cylinder and the outer cylinder to form the evaporation part of the refrigeration cycle, and the direct expansion type cooling system is used to minimize the amount of refrigerant used.

The cold heat may be indirectly cooled by a low temperature brine formed by the cold heat source.

The above invention describes another cooling method for the cooling method used in the method for making slurry ice according to the present invention, wherein the cold heat to be supplied is indirectly cooled by the low temperature brine formed by the cold heat source. But good.

Further, the supply of the cold heat forms a high-speed spiral flow through the flow path between the inner cylinder and the outer cylinder to increase the heat transfer area and the heat transfer coefficient. Preferably.

According to the invention, since the cold heat supply passage is provided in a spiral shape, highly efficient cooling is possible corresponding to the direct expansion type cooling system or the indirect type cooling system.

A preferred slurry ice making apparatus utilizing the method for producing slurry ice according to the present invention supplies the cold heat through the flow path between the inner cylinder and the outer cylinder of the double cylindrical container. Then, an aqueous solution containing an antifreeze solution is allowed to flow into the inner cylinder, and a slurry ice ice-making device comprising a slurry ice ice-making machine that precipitates ice crystals on a heat transfer surface formed on the inner surface of the inner cylinder, wherein the slurry ice-making machine is A rotary frame that rotates inside the inner cylinder about the axis of the double cylindrical container as a rotation axis; a rotatable longitudinal roller provided along the inner cylinder generatrix on the rotary frame; It is characterized in that a pressing means for pressing and rolling is provided, and an ice layer peeling means composed of the pressing means is provided, and a spiral partition is provided in the cold heat passage to suppress the flow passage cross-sectional area small.

The above invention relates to a structure of a slurry ice ice making machine which constitutes a slurry ice ice making apparatus using the slurry ice making method of the present invention, and comprises a double cylindrical container having an inner cylinder and an outer cylinder. Then, a flow path of a heat medium that receives cold heat is formed between the inner cylinder and the outer cylinder, an aqueous solution containing an antifreeze liquid is allowed to flow into the inner cylinder, and ice crystals are deposited on the heat transfer surface of the inner surface of the inner cylinder. A slurry ice ice-making device comprising a slurry ice ice-making machine, wherein in the slurry ice ice-making machine, a vertically long rotatable roller provided along a generatrix of the inner surface of the inner cylinder of the double cylindrical container,
A rotary frame that holds the roller and rotates the inside of the cylinder around the axis of the inner cylinder, and an elastic member that presses the inner surface of the inner cylinder with a predetermined pressure for the roller provided on the rotary frame. The pressing means and the ice layer peeling means are further configured, and a rotatable vertical roller provided along the inner cylinder bus is provided.
Hold the inner cylinder axis on the rotating frame as the axis of rotation,
The inside of the inner cylinder is rotated, and the ice crystals deposited on the heat transfer surface of the inner surface of the inner cylinder are pressed and brought into contact by centrifugal force and the pressing means,
The rotatable roller is rolled to form a thin ice layer. The thin ice layer formed next is so designed that the negative pressure on the back surface of the roller causes the entire amount of the thin ice layer to be peeled off from the deposition surface immediately thereafter.

The generation and peeling of the thin ice layer are continuously carried out, and stable generation of slurry ice is possible without causing bridging of the generated ice layer. Further, as described above, the power required to rotate the rotation frame of the roller may be a small power required to roll the roller on the ice layer under a light pressing force.

The structure of the flow path of the cooling medium for supplying the cold heat has a cross-sectional structure with a spiral partition to increase the flow rate of the refrigerant and to expand the heat transfer area, thereby making the structure capable of efficient cooling. ing.

The slurry ice maker is preferably a direct expansion type ice maker forming an evaporator of a refrigeration cycle for supplying the cold heat.

The above invention describes a direct expansion type ice making machine which functions as an evaporator of the cold heat source by using the evaporated refrigerant gas immediately after passing through the expansion valve of the cold heat source in the cooling method of the slurry ice making machine. Thus, a more efficient direct expansion type cooling system can be formed by an electronic expansion valve provided with a steam superheat meter at the outlet of the ice making machine flow path forming the evaporator outlet.
Further, the amount of the refrigerant used is minimized by the direct expansion cooling, which enables ice-making using the environment-friendly refrigerant.

Further, it is preferable that the slurry ice maker is an indirect type ice maker operated by a low temperature brine formed by the refrigerating cycle for supplying the cold heat.

In the above invention, a low temperature brine formed by the cold heat source is used for cooling the slurry ice maker of the slurry ice maker and an indirect cooling flow path is formed by the low temperature brine. Is.

The roller used in the slurry ice maker of the slurry ice maker is preferably made of resin or metal and is grooved.

According to the above invention, the parallel grooving or spiral grooving of the roller surface is used to improve the efficiency of the peeling operation of the ice layer.

[0025]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc. of the components described in this embodiment are merely illustrative examples, not the intention to limit the scope of the present invention thereto, unless otherwise specified. . Figure 1
FIG. 1 is a diagram showing a schematic configuration of a slurry ice maker that constitutes a slurry ice maker of the present invention, FIG. 2 is a sectional view of FIG. 1, and FIG. FIG. 4, FIG. 4 is a view showing a roller shape used for the pressing roller of FIG. 1, (A) is a smooth roller, (B) is a parallel grooved roller, and (C) is a spiral grooved roller, Figure 5
FIG. 2 is a diagram showing a configuration of a flow path of a cooling medium provided between the outer cylinder and the inner cylinder of FIG. 1. FIG. 6A is a diagram showing a schematic configuration of a slurry ice making device when a direct expansion type ice making machine is used in the slurry ice making machine of FIG. 1, and FIG. 6B is a slurry when an indirect type ice making machine is used. It is a figure which shows schematic structure of an ice-making device. FIG. 7 is a view showing a flow sheet when a direct expansion type ice making machine is used in the slurry ice making device of FIG.

As shown in FIG. 1, a slurry ice maker 10 constituting a slurry ice maker according to the present invention comprises an inner cylinder 17 for introducing an aqueous solution containing an antifreeze liquid and cooling the aqueous solution to produce ice crystals. A double cylindrical container 11 composed of an outer cylinder 18 into which a cooling medium for supplying cold heat for producing ice crystals is introduced to form a jacket-like flow path 16 outside the inner cylinder, and the inner cylinder 17 A thin ice layer is formed from the ice crystals deposited on the inner heat transfer surface 17a, and the formed ice layer is used as the heat transfer surface 17a.
A rotatable pressing roller 1 provided to be separated from a.
2 and a rotary frame 1 that holds the roller 12 along the generatrix of the inner cylinder 17 and rotates the inner side of the inner cylinder 17 around the main shaft 14.
3, pressing and peeling means 15 for pressing and rolling ice crystals formed on the heat transfer surface by the pressing roller 12 to form and peel off a thin ice layer, and the rotary frame 1
The drive unit 14a is composed of a deceleration motor that rotates the motor 3.

As shown in FIG. 2, the pressing / separating means 15 is a normal-direction pressing / sliding mechanism having a built-in spring 15a provided on the roller support arm of the rotating frame 13, and the rotating frame 13 supports the main shaft 14. When rotating in the direction of arrow A about the center, as shown in the schematic view of FIG. 3, the heat transfer surface 1 is generated by the centrifugal force F ₁ of the pressing roller 12 and the pressing force of the spring.
The pressing roller 12 presses the ice crystal 22 deposited on 7a with an arrow B.
Press while rolling in the direction to form a thin ice layer. A negative pressure F ₂ is generated between the rolling pressure roller 12 and the inner surface of the inner cylinder, so that the formed thin ice layer is easily separated from the heat transfer surface 17a. Since the peeling of the ice layer does not depend on the scraping operation using a blade or the like seen in the conventional example, not only the power required for the peeling operation is small, but in the case of the present invention, it is due to the negative pressure due to the rolling of the rollers. Therefore, there is no wear of the peeling member as seen in the conventional example, the deposited ice crystals 22 are peeled off without accumulating, bridging does not occur, and high-quality slurry ice with high heat transfer efficiency is obtained. .

The pressing roller 12 is made of resin or metal, and its surface shape is as shown in FIG.
As can be seen from (B) and (C), the smooth plain shape (plane roller 12a), the parallel groove shape (parallel groove roller 12b), and the spiral groove shape (spiral groove roller 12c) are It can be used properly according to the situation.

It should be noted that, in FIG. 1, the inner cylinder 17 is provided at a lower portion thereof with an inlet 2 for an aqueous solution containing the antifreeze liquid to be cooled.
1a is provided, an outlet 21b for slurry ice generated as a result of cooling is provided at the upper part, and a jacket-like flow passage 16 formed between the inner cylinder 17 and the outer cylinder 18 is provided with a cooling medium inlet port 20a at the lower part. The cooling medium outlet 20b is provided in the upper portion.

FIG. 5 shows the structure of the flow path of the cooling medium for supplying cold heat provided between the inner cylinder 17 and the outer cylinder 18 of the double cylindrical container 11 of FIG. As shown in the figure, the space formed between the inner cylinder 17 and the outer cylinder 18 is partitioned by the spiral fins 19 shown by the phantom lines of the dotted line and the chain double-dashed line in FIG. The narrow cross section enables high-speed fluidization of the cooling medium, and the heat transfer area of the spiral fin 19 is increased to increase the inner cylinder 17
It enables highly efficient precipitation of ice crystals on the inner heat transfer surface 17a.

As described above, the spiral flow path having high heat transfer efficiency is used for the direct expansion type cooling system in which the evaporated refrigerant gas immediately after passing through the expansion valve is used as the cooling medium for supplying the cold heat, and the low temperature formed by the cold heat source. An indirect cooling system using brine can be used, and FIG. 6 (A) shows a schematic structure of a slurry ice making device including a direct expansion type ice making machine using the direct expansion type cooling system. In the case of the above-mentioned direct expansion type ice maker, the amount of refrigerant used can be minimized, and in this case, the refrigeration cycle forms the evaporator with the condensing unit 35 including the compressor 25, the condenser 26 and the like. It comprises a direct expansion type ice making machine 10a and an expansion valve 27. An expansion valve 27 is provided in front of the cooling medium inflow port 20a of the direct expansion type ice making machine 10a to operate the spiral flow path as an evaporator, and to superheat downstream of the cooling medium outlet 20b as described later. A thermometer is provided and an electronic expansion valve is provided in the expansion valve to control the superheat degree of the refrigerant gas at the outlet 20b, generate slurry ice, and store it in the ice heat storage tank 29.
The above-mentioned superheat degree control uses a dedicated electronic expansion valve when ammonia is used as the refrigerant.

FIG. 6 (B) shows a schematic structure of a slurry ice making device comprising an indirect ice making machine 10b using a low temperature brine separately formed by a cold heat source as a cooling medium for supplying cold heat. In this case, the refrigeration cycle includes a compressor 25,
The indirect ice maker 10 includes a condenser 26, an expansion valve 27, and an evaporator 30, and the evaporator 30 generates low-temperature brine.
b is circulated to generate slurry ice, which is stored in the ice heat storage tank 29.

FIG. 7 shows a flow sheet when a direct expansion type ice making machine is used in the slurry ice making device of FIG.
As shown in the figure, the present slurry ice-making device includes a condensing unit 35, a liquid-gas heat exchanger 36, and a liquid receiver 3.
7, a plurality of ice-making machines including a direct expansion type ice-making machine 10a each having a superheat meter 38 and an electronic expansion valve 27a, and an ice heat storage tank 29, and a liquid-gas heat exchanger 36.
The refrigerant gas that radiates heat is compressed by the condensing unit 35, the refrigerant condensate that is condensed after compression is cooled by the liquid-gas heat exchanger 36, and is passed through the liquid receiver 37 in each of the plurality of ice making machines. Direct expansion type cooling is performed via the electronic expansion valve 27a to obtain slurry ice, which is stored in the ice heat storage tank 29, and an aqueous solution containing an antifreeze solution that remains in the lower portion of the heat storage tank is returned to the ice making machine group. is there.

[0034]

EFFECTS OF THE INVENTION Since the pressing and peeling means of the roller is used for peeling the ice layer from the ice crystal deposition surface, stable peeling with no wear on the peeling member and eventually stable formation of slurry ice can be achieved. it can. In addition, the structure of the direct expansion type ice making machine using the direct expansion type cooling allows the use of a very small amount of refrigerant, does not cause environmental problems, and can cope with the use of natural refrigerants such as ammonia and hydrocarbons. Further, since the slurry ice is generated by the pressing and peeling means using the roller, it is possible to obtain the slurry ice having high heat transfer efficiency without causing bridging.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic configuration of a slurry ice maker of a slurry ice maker of the present invention.

FIG. 2 is a sectional view of FIG.

FIG. 3 is a schematic diagram showing a state of ice layer formation and peeling by the pressing peeling means of FIG.

4A and 4B are views showing a roller shape used for the pressing roller of FIG. 1, FIG. 4A is a view showing a smooth roller, FIG. 4B is a view showing a parallel grooved roller, and FIG. It is a figure which shows a roller.

5 is a diagram showing a configuration of a flow path of a cooling medium provided between the outer cylinder and the inner cylinder of FIG.

6A is a diagram showing a schematic configuration of a slurry ice making device when a direct expansion type ice making machine is used in the slurry ice making machine of FIG. 1, and FIG. 6B is a case where an indirect type ice making machine is used. It is a figure which shows schematic structure of the slurry ice making device of.

FIG. 7 is a diagram showing a flow sheet of the slurry ice maker when a direct expansion type ice maker is used in the slurry ice maker of FIG.

FIG. 8 is a sectional view showing a schematic configuration of an ice scraping method of a conventional slurry ice making machine.

[Explanation of symbols]

10a Direct expansion ice machine 10b Indirect ice machine 11 Double cylindrical container 12 Pressing roller 12a plain roller 12b Parallel grooved roller 12c Roller with spiral groove 13 rotating frame 14 spindle 14a drive unit 15 Press release means 16 jacket-like channels 17 Inner cylinder 17a Heat transfer surface 18 outer cylinder 19 spiral fin 20a Coolant inlet 20b Coolant outlet 21a Inflow port for aqueous solution 21 Slurry ice exit 25 compressor 26 condenser 27 Expansion valve 27a Electronic expansion valve 29 Ice storage tank 30 evaporator 35 Condensing Unit 36 Liquid-gas heat exchanger 37 Receiver 38 Superheat meter

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Akito Machida             2-13-1, Peony, Koto-ku, Tokyo Stock market             Shamaegawa Works (72) Inventor Kazuyuki Iwase             2-13-1, Peony, Koto-ku, Tokyo Stock market             Shamaegawa Works (72) Inventor Kenta Sasaki             2-13-1, Peony, Koto-ku, Tokyo Stock market             Shamaegawa Works

Claims (8)

[Claims] 1. A heat transfer surface on the inner surface of the inner cylinder, wherein an aqueous solution containing an antifreeze liquid is circulated in the inner cylinder of the double cylinder, and cold heat is supplied through a flow path provided between the inner cylinder and the outer cylinder. In the ice making method for precipitating ice crystals on the ice crystal, the roller is pressed and moved parallel to the inner surface of the inner surface of the ice crystal on the ice crystal precipitation surface, an ice layer is generated by rolling of the roller accompanied by the movement, and a roller by the rolling. A method of making slurry ice, characterized in that the ice layer is peeled by a negative pressure generated on the back surface to generate slurry ice. 2. The method for making slurry ice according to claim 1, wherein the cold heat is subjected to direct expansion type cooling by an evaporated refrigerant gas generated via an expansion valve of a cold heat source. 3. The ice making method for slurry ice according to claim 1, wherein the cold heat is subjected to indirect cooling with a low temperature brine formed by the cold heat source. 4. The supply of cold heat forms a flow in a high-speed spiral shape through a flow path between the inner cylinder and the outer cylinder,
The method for making slurry ice according to claim 1, wherein the heat transfer area is increased and the heat transfer coefficient is improved. 5. The cold heat is supplied through a flow path between an inner cylinder and an outer cylinder of a double-cylindrical container, an aqueous solution containing an antifreeze liquid is allowed to flow into the inner cylinder, and is formed on the inner surface of the inner cylinder. In a slurry ice ice-making device comprising a slurry ice ice-making machine for precipitating ice crystals on the heat transfer surface, the rotation of the slurry ice-making machine rotates inside the inner cylinder with the axis of the double cylindrical container as the rotation axis. A frame, a rotatable vertical roller provided in parallel to the inner cylinder generatrix on the rotary frame, a pressing means for rolling the roller against the inner surface of the inner cylinder, and an ice layer peeling means. In addition, the cold ice flow passage is provided with a spiral partition to reduce the flow passage cross-sectional area to a small extent, and a slurry ice making device. 6. The slurry ice making machine according to claim 5, wherein the slurry ice making machine is a direct expansion type ice making machine forming an evaporator of a refrigerating cycle for supplying the cold heat. 7. The slurry ice maker according to claim 5, wherein the slurry ice maker comprises an indirect ice maker operated by a low temperature brine formed by the refrigerating cycle for supplying the cold heat. 8. The slurry ice making device according to claim 5, wherein the roller is made of resin or metal and has a grooved structure.