JP3102042B2 - Ice making equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice making apparatus in which water or an aqueous solution in an ice storage tank is circulated and supercooled, and then the supercooled state is eliminated by recooling to produce slurry ice. In particular, it relates to the cooling performance of the supercooling elimination section.

Conventionally, a water circulation circuit for circulating water in an ice storage tank between a heat exchanger connected to a cooling device and an ice storage tank has been provided, and the water in the ice storage tank is slurried by the heat exchanger. For example, as an ice making device that is made into a compound,
As disclosed in Japanese Patent No. 217171, an inclined gutter is formed so that the outlet side of the water circulation path is directed downward at the upstream side and the outlet end is opened at a certain height above the water surface of the ice storage tank. A vessel is interposed between the gutters, and the water supercooled by the heat exchanger in the water circulation path is released from the supercooled state at the outlet of the gutter to be turned into a slurry, and the iced material is stored in an ice storage tank. It is a known technique to drop it on the surface. Also,
As disclosed in Japanese Utility Model Laid-Open Publication No. 1-112345, a baffle plate and an inclined gutter are provided, and water supercooled by the heat exchanger is released into the atmosphere and collides with the baffle plate to reduce the supercooled state of water. It is also a well-known technique to dissolve the water to make the water ice and drop it into an ice storage tank via a gutter.

[0003]

In these prior arts, since water or an aqueous solution is transferred by falling using a gutter, there are design restrictions such as arrangement of equipment. In order to solve this problem, the applicant has disclosed in Japanese Patent Application No. 2-1055952 a supercooling elimination unit for recooling in a pipe in the middle of a water circulation path for circulating water or an aqueous solution in an ice storage tank. It was proposed to send the iced water or aqueous solution in the form of a slurry to an ice storage tank through a closed conduit. A certain flow rate is required to flow the slurry-like iced matter without settling, and the flow rate should be high in order to prevent the adhesion of ice to the inner wall of the pipeline. However, when the flow velocity is high, the water or the aqueous solution flows away before the temperature of the water or aqueous solution is sufficiently decreased in the subcooling elimination section. To prevent this, lower the temperature of the subcooling elimination section and increase the temperature difference with water or aqueous solution to increase the cooling capacity, or increase the heat transfer area of the supercooling elimination section to increase the cooling capacity. However, the former requires a device for generating a low-temperature cooling source for cooling the subcooling elimination part, and the latter has a disadvantage that the device has a large capacity. The present invention has been made in view of such a point, and an object of the present invention is to efficiently eliminate a supercooled state of water or an aqueous solution with a small device.

[0004]

To achieve the above object, the present invention provides an ice storage tank (5) for storing a slurry of ice or water or an aqueous solution as shown in FIG.
A main heat exchanger (22) connected to the cooling device (2) for supercooling water or an aqueous solution, and the main heat exchanger (2).
2) is provided in a flow path in a return line (51B) connecting the ice storage tank (5) to the ice storage tank (5) to remove a supercooled state of water or an aqueous solution to form a slurry-like hydrate. It is assumed that the ice making device includes a cooling canceling unit (8).

As shown in FIGS. 3 to 12, a first solution is to use a return pipe (51) as a structure of a subcooling elimination section (8).
A concave portion (83) bulging outward from the inner surface of the tube of (B) is formed, and the inner surface of the concave portion (83) is used as a cooling heat transfer surface (81) of the subcooling eliminating portion (8). is there.

As shown in FIGS. 13 to 18, a second solution is provided around the cooling heat transfer surface (81) of the subcooling elimination section (8), and in the vicinity of the cooling heat transfer surface (81). And a barrier (82) for locally reducing the flow rate of water or aqueous solution.

As shown in FIGS. 19 to 22, the third solving means is provided in close proximity to the supercooling elimination section (8) in addition to the first or second solving means, and Department (8)
And a freezing prevention unit (9) for heating the return pipe (51B) so as to dissociate the adhered icy matter generated on the pipe wall to the pipe wall.

As shown in FIG. 2 and FIG. 23, a fourth solution means includes a cooling device (2) in addition to the first or second solution means, and a compressor (11), (21), Condenser (1
2) A cooling device (2) including a refrigerant circuit (1) in which a pressure reducing mechanism (23) and a main heat exchanger (22) acting as an evaporator are sequentially connected. The supercooled water or aqueous solution is cooled by heat exchange with the refrigerant of the refrigerant circuit (1), and the liquid inlet (35) of the refrigerant circuit (1) and the refrigerant inlet of the supercool elimination unit (8). End (86)
And the refrigerant outlet end (87) of the subcooling eliminating section (8) is connected to the low pressure section (25) of the refrigerant circuit (1). is there.

The fifth solution is, as shown in FIGS. 2 and 24, a cooling device (2) in addition to the third solution.
To the main heat exchanger (2) acting as compressors (11), (21), condenser (12), pressure reducing mechanism (23) and evaporator.
2) is a cooling device (2) including a refrigerant circuit (1) which is sequentially connected, and the supercooling elimination unit (8) is provided with water or supercooled water by heat exchange with the refrigerant in the refrigerant circuit (1). The antifreeze section (9) cools the aqueous solution, and the supercooling eliminating section (8) is formed by heat exchange with the refrigerant in the refrigerant circuit (1).
The refrigerant inlet end (96) of the anti-freezing part (9) is connected to the liquid pipe part (35) of the refrigerant circuit (1), and the supercooling elimination part (8) is heated. The refrigerant outlet end (87) is connected to the low pressure part (25) of the refrigerant circuit (1), and the refrigerant outlet end (97) of the freeze prevention part (9) and the refrigerant inlet end (86) of the subcooling elimination part (8). ) Is connected via a decompression unit (C4). Sixth solution
Is a return line (51) as a configuration of the supercooling elimination section (8).
Water or water in the return line (51B) outward to the inner surface of the tube of B)
Forms a retention part (83) through which the aqueous solution can flow, and
Cooling heat transfer surface of subcooling elimination section (8) on inner surface of stagnation section (83)
(81) is provided.

[0010]

According to the first aspect of the present invention,
In the depression (83) of the supercooling elimination section (8), a so-called quasi-stationary state in which the flow of the water or the aqueous solution is stagnant and slows down. When cooling through the cooling heat transfer surface, the water or aqueous solution will flow away before the temperature drops sufficiently if the flow is fast. However, the depression (8) of the subcooling eliminating part (8) of the present invention.
In 3), since the flow rate of water or aqueous solution becomes slow,
The temperature of the water or the aqueous solution is sufficiently lowered by the cooling heat transfer surface (81) on the inner surface of the concave portion (83), so that the cooling capacity is improved and the supercooling is efficiently eliminated. Further, since the flow rate of the water or the aqueous solution is not reduced, the flow of the produced icy substance does not deteriorate, so that the return pipe (51) is not blocked. The reason why the supercooled state of the whole water or the aqueous solution can be eliminated without recooling the whole of the water or the aqueous solution is that iced material is formed in the depression (83), and this iced material becomes a core.

According to the second aspect of the present invention, the supercooling eliminating section (8)
Of the water or the aqueous solution, the flow rate of the water or the aqueous solution becomes slower at the place where it contacts the cooling heat transfer surface (81) of the subcooling eliminating section (8). Further, since the overall flow rate of water or the aqueous solution is not reduced, the cooling capacity is improved, the supercooling is efficiently performed, and the flow of the icy substance is deteriorated, as in the first aspect of the present invention. Does not occur in the return line (51B).

According to a third aspect of the present invention, in addition to the first or second aspect of the present invention, the supercooling elimination section (9) for heating the pipe wall around the supercooling elimination section (8) eliminates the supercooling. The iced product generated in the section (8) is dissociated from adhering to the tube wall in the vicinity of the subcooling elimination section (8) to prevent freezing of the subcooling elimination section (8) and the tube wall in the vicinity thereof, thereby making ice. Improve efficiency.

According to a fourth aspect of the present invention, in addition to the first or second aspect, the main heat exchanger (22) is connected to the refrigerant circuit (1) of the cooling device (2). In the cooling elimination unit (8), the liquid refrigerant in the refrigerant circuit (1) is cooled by circulating a low-temperature refrigerant decompressed by the decompression unit (C4), so that supercooling can be eliminated without providing a separate cooling device. Done.

According to a fifth aspect of the present invention, in addition to the third aspect of the invention, the main heat exchanger (22) is connected to the refrigerant circuit (1) of the cooling device (2), ), The relatively high-temperature liquid refrigerant of the refrigerant circuit (1) flows, while the supercooling elimination unit (8) is cooled by heat exchange with the refrigerant in the antifreezing unit (9), and further cooled by the decompression unit (C4). Since the low-temperature refrigerant decompressed in step (1) flows, the supercooling is eliminated and the freezing is prevented without providing a separate heating and cooling device. Claim 6
According to the invention, the stagnation part (83) of the subcooling elimination part (8) is
And the flow of water or aqueous solution stagnates and slows down.
Cooling of the subcooling elimination section (8) provided on the inner surface of the section (83).
The temperature of water or aqueous solution is sufficiently lowered by the heat transfer surface (81).
To It also slows down the flow rate of water or the entire aqueous solution.
, Cooling capacity is improved as in the first aspect of the invention.
However, supercooling is efficiently eliminated and the flow of
Blockage in the return line (51B)
No.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. FIG. 2 shows an embodiment of an air conditioner provided with the ice making device of the present invention, and the refrigerant circuit (1) of the cooling device (2) is configured as follows. (11) is a first compressor, (12) is an outdoor heat exchanger disposed on the discharge side of the first compressor (11) and exchanges heat between refrigerant and outdoor air, and (13) is an outdoor heat exchanger. An outdoor electric expansion valve for adjusting or reducing the flow rate of refrigerant in an exchanger (12), wherein the devices (11) to (13) are connected in series in a first pipe (14). . (21) is the second compressor,
(22) is disposed on the discharge side of the second compressor (21), and is a main heat exchanger for supercooling water or an aqueous solution in an ice storage tank (5) described later, and (23) is a main heat exchanger. A water-side electric expansion valve that adjusts the flow rate of the refrigerant when the device (22) functions as a condenser, and reduces the pressure of the refrigerant when the device (22) functions as an evaporator; They are connected in series in a line (24).

Incidentally, (SD1) and (SD2) are oil separators provided in discharge pipes of the compressors (11) and (21), respectively, and (C1) and (C2) are oil separators (SD1). ,
(SD2) oil return pipes (R
T1) and (RT2) depressurized capillary tubes, respectively. Further, (32), (32)
Are indoor heat exchangers arranged in each room, (33), (3)
3) an indoor electric expansion valve as a pressure reducing valve for reducing the pressure of the refrigerant,
Each of the devices (32) and (33) is connected in series, and each set thereof is connected in parallel in the third conduit (34). Reference numeral (35) denotes a liquid pipe section connecting the outdoor electric expansion valve (13) and the water-side electric expansion valve (23). And, the first pipe (14) and the second pipe (24) are the third pipe.
It is connected in parallel to the conduit (34). In addition,
(AC) is an accumulator provided in the third pipe (34) on the suction side of each of the compressors (11) and (21). (10) connects the gas pipe of the outdoor heat exchanger (12) and the gas pipe of the indoor heat exchangers (32), (32) to the discharge side or the suction side of each of the compressors (11), (21). A four-way switching valve (10) for switching communication, the four-way switching valve (1
When 0) is switched to the solid line side in the figure, the outdoor heat exchanger (12) functions as a condenser, the main heat exchanger (22) or the indoor heat exchangers (32), (32) function as evaporators, When the four-way switching valve (10) is switched to the dashed line in the drawing, the outdoor heat exchanger (12) is an evaporator, the main heat exchanger (22) or the indoor heat exchangers (32), (32) are condensate evaporators. Function as Furthermore, a low-pressure section (25) that bypass-connects the suction side of each of the compressors (11) and (21), and a main heat exchanger (2).
A water-side switching valve (26) for switchingly communicating the gas pipe of (2) with the discharge pipe of the second compressor (21) and the low-pressure part (25) is provided. The water-side switching valve (26) utilizes three ports of the four-way switching valve to form the water-side switching valve (26).
Is switched to the solid line side in the figure, the main heat exchanger (2
2) functions as an evaporator, while the water-side switching valve (26)
Is switched to the broken line side in the figure, the main heat exchanger (2
2) the gas pipe communicates with the discharge pipe of the second compressor (21),
The main heat exchanger (22) functions as a condenser. Note that (C3) is a capillary tube interposed in the piping on the dead port side of the water-side switching valve (26).

Further, a bypass path (3) for connecting discharge pipes of the first compressor (11) and the second compressor (21).
A check valve (4) that allows only refrigerant flow from the discharge pipe side of the second compressor (21) to the discharge pipe side of the first compressor (11) is provided in the bypass passage (3). ) Is interposed. That is, when the outdoor heat exchanger (12) and the main heat exchanger (22) function as condensers, the main heat exchanger (2)
When the condensing temperature in 2) is high and the pressure is high, the discharge gas of the second compressor (21) is allowed to escape to the outdoor heat exchanger (12) side, so that the amount of heat radiation can be distributed. Here, the ice making device is provided with an ice storage tank (5) for storing slurry or iced water or aqueous solution as a heat storage medium, and the ice storage tank (5) and the main heat exchanger are provided. The connection with (22) is connected so that water or an aqueous solution is circulated by a water circulation path (51). The water circulation path (51) extends from the lower part of the ice storage tank (5) to the main heat exchanger (2).
2) an outgoing pipeline (51A) for supplying water or aqueous solution, and a return pipeline (51B) for returning slurry or iced water or aqueous solution from the main heat exchanger (22) to the upper part of the ice storage tank (5). And a strainer (53) for removing solids such as icing and dust in water or an aqueous solution in the water circulation path (51) downstream of the pump (52) in the outward pipe (51A). A preheat heat exchanger (6) for preheating water or an aqueous solution supplied to the main heat exchanger (22) is further provided downstream of the strainer (53). On the other hand, the liquid line of the refrigerant circuit (1) is provided with a preheating bypass passage (61) for passing a part of the liquid refrigerant to the preheating heat exchanger (6) by bypassing the water-side electric expansion valve (23). And
On the downstream side of the preheating heat exchanger (6) in the preheating bypass passage (61), a preheating electric expansion valve (62) having a refrigerant pressure reducing function and a flow rate control function (62) is provided. The preheating electric expansion valve (62) and the water-side electric expansion valve (23) regulate the refrigerant flow rate in the preheating bypass path (61) and reduce the pressure of the refrigerant during the ice making operation of the main heat exchanger (22). Has also been made to do.

Further, in the return line (51B) of the water circulation path (51), downstream of the main heat exchanger (22), water or an aqueous solution in the return line (51B) is cooled to perform main heat exchange. A recooler is provided as a supercooling elimination unit (8) for eliminating the supercooled state of the water or the aqueous solution supercooled by the cooler (22), and a pipe line is provided around the supercooling elimination unit (8). An anti-freezing section (9) having a heating heat transfer surface (91) for preventing freezing is provided. Further, between the supercooling eliminating section (8) and the main heat exchanger (22), Return line (51
A heat-retaining heat exchanger (7) as a freezing prevention part for preventing freezing of B) from progressing to the main heat exchanger (22).
Is provided. Further, while the liquid refrigerant flows from the liquid pipe portion (35) of the refrigerant circuit (1) to the heat retaining heat exchanger (7), the elimination bypass path (85) branches off from the liquid pipe portion (35) and extends. The elimination bypass (85) corresponds to FIG.
As shown in FIG. 4, the refrigerant inlet end (96) of the anti-freezing part (9)
To the refrigerant outlet end (9) of the freeze prevention section (9).
7) is connected to the refrigerant inlet end (86) of the subcooling elimination unit (8) via a pressure reducing unit (C4) composed of a pressure reducing valve or a capillary tube, and has a refrigerant outlet end (8).
7) is connected to a low-pressure section (25) on the suction side of the compressors (11) and (21). That is, in the supercooling elimination section (8), the water or the aqueous solution supercooled in the main heat exchanger (22) is recooled by heat exchange with the refrigerant that has been decompressed in the decompression section (C4) and cooled down, The supercooled state is eliminated and the slurry is iced, and the slurry ice is circulated to the ice storage tank (5) via the return line (51B), while being condensed in the antifreezing section (9). By bypassing the refrigerant liquid, the pipe wall is heated to dissociate the adhered icy matter to the pipe wall caused by the elimination of the supercooled state.

Further, in the heat-retaining heat exchanger (7), heating is performed by exchanging heat with the liquid refrigerant in the liquid line, and the water or the aqueous solution is super-cooled in the sub-cooling eliminating section (8) or the return line (51B). The frozen matter generated by the dissolution is prevented from adhering to the pipe wall of the return pipe (51B) and freezing to propagate to the main heat exchanger (22). When cooling in the room during operation of the air conditioner, the four-way switching valve (10) is switched to the solid line side in the figure. When the water-side switching valve (26) is switched to the solid line side in the figure, each compressor (1
After the refrigerant discharged from (1) and (21) are both condensed in the outdoor heat exchanger (12), each indoor heat exchanger (32),
Evaporation in (32) cools the room. Also, when the water-side switching valve (26) is switched to the broken line side in the figure, the refrigerant discharged from the first compressor (11) flows to the outdoor heat exchanger (12), while the refrigerant discharged from the second compressor (21). The discharged refrigerant flows to the main heat exchanger (22), and after being condensed, circulates so as to evaporate in each of the indoor heat exchangers (32), (32). A cold storage operation for storing cold in the tank (5) is performed. That is, the four-way switching valve (10) and the water-side switching valve (26) are switched to the solid line side in the figure, and the indoor electric expansion valves (33), (3)
3) is closed, and the refrigerant discharged from each of the compressors (11) and (21) is condensed by the outdoor heat exchanger (12), and then the water-side electric expansion valve (23) or the preheating electric expansion valve (62). By depressurizing and evaporating the water or the aqueous solution in the ice storage tank (5) by evaporating the water or the aqueous solution in the ice storage tank (5), the water or the aqueous solution in the ice storage tank (5) is frozen to store cold heat. It has been done.

Here, in the present invention, the main heat exchanger (22)
In the downstream return line (51B), the main heat exchanger (2
The supercooled water or aqueous solution in 2) is the subcooling cancellation part (8)
The supercooled state is eliminated, and the slurry is forcibly circulated to the ice storage tank (5) in a slurry state, and the iced substance in the slurry state is stored in the ice storage tank (5), which is necessary for daytime cooling operation. Cold heat is stored. At this time, if the overall flow velocity of the water or aqueous solution in the return line (51B) is high, the water or aqueous solution flows away before the temperature of the water or aqueous solution is sufficiently lowered in the subcooling elimination section (8). Also, if the overall flow rate of the water or the aqueous solution in the return line (51B) is reduced, ice adheres to the inside of the conduit of the slurry of the iced product and the conduit is blocked.

Therefore, in the embodiment according to the first aspect of the present invention, a concave portion (83) bulging outward with respect to the inner surface of the pipe in the return pipe (51B) is formed, and the concave portion (83) is formed.
By making the inner surface the cooling heat transfer surface (81) of the subcooling elimination section (8), the flow rate of water or aqueous solution is locally reduced on the cooling heat transfer surface (81) of the supercooling elimination section (8). Therefore, the residence time of the water or the aqueous solution on the cooling heat transfer surface (81) becomes longer, the temperature of the water or the aqueous solution can be sufficiently lowered, and the cooling capacity is improved. Therefore, without increasing the heat transfer area of the cooling heat transfer surface (81),
Further, supercooling can be efficiently eliminated without preparing a particularly low-temperature cooling source for the supercooling eliminating section (8). FIGS. 3 and 4 show the shape of the cooling heat transfer surface (81) of the subcooling eliminating section (8) according to the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view, and FIG. 4 is a transverse sectional view thereof.
The inner surface of the cylindrical recess (83) is the cooling heat transfer surface (8).
1), the residence time of the water or the aqueous solution is prolonged in the cylindrical concave portion (83), and the temperature is sufficiently lowered. Therefore, the cooling capacity of the supercooling eliminating portion (8) is high, and Elimination is performed efficiently.

Here, as a means for cooling the cooling heat transfer surface (81), the cooling heat transfer surface (81) is cooled by the refrigerant introduced from the refrigerant inlet end (86) of the supercool elimination section (8), and the refrigerant is cooled. From the refrigerant outlet end (87) of the subcooling eliminating section (8). As this refrigerant, it is desirable to use the refrigerant circuit (2) of the cooling device (1) as in the invention of claim 4, but in the invention of claim 1, a separate cooling device may be provided and the refrigerant may be used. However, the present invention is not limited to the one using the refrigerant of the refrigerant circuit (2) of the cooling device (1).
In the first aspect of the present invention, the shape of the depression (83) of the subcooling eliminating section (8) is not limited to FIGS. 5 to 12 show modifications of the first embodiment,
Each odd-numbered figure is a vertical cross-sectional view, and each even-numbered figure is a cross-sectional view corresponding to the previous numbered figure. Here, FIGS. 5 and 6 show the case where the shape of the recess (83) is a cone, and FIGS. 7 and 8 show the case where the shape of the recess (83) is a hemisphere.
FIG. 11 shows a case where there are three cylindrical recesses (83).
FIG. 12 shows a case in which the recessed part (83) is connected around the cross section of the pipe. Also in these modified examples, the flow rate of the water or the aqueous solution is locally reduced and the temperature is sufficiently lowered, so that the cooling capacity of the subcooling elimination unit (8) is high, and the supercooling is efficiently eliminated. In addition, a depression (83) having a shape such as a triangular prism or a rectangular parallelepiped shows the same effect.

Next, an embodiment according to the second aspect of the present invention will be described. FIGS. 13 and 14 show a longitudinal section and a transverse section, respectively, of the cooling heat transfer surface (81) of the subcooling eliminating section (8).
In the present invention, the cooling heat transfer surface (81) of the subcooling eliminating section (8)
Is surrounded by a hollow cylindrical barrier portion (82), one end of which is in contact with the supercooling elimination portion (8) and is closed, and water or aqueous solution is only provided from the opening at the other end. As water flows in and out, the flow of water or aqueous solution is obstructed, and the flow velocity is locally reduced on the cooling heat transfer surface (81). Therefore, the residence time of the water or the aqueous solution on the cooling heat transfer surface (81) is prolonged, and the temperature is sufficiently lowered.
Has a high cooling capacity, and supercooling is efficiently eliminated.
Although the configuration of the supercooling elimination section (8) is different, the same effect as the first aspect of the present invention is exhibited. Here, the cooling means of the cooling heat transfer surface (81) is the same as in claim 1.

In this embodiment, the barrier portion (82) shown in FIGS. 13 and 14 has a cylindrical shape. However, the barrier portion (82) may have any shape as long as it surrounds the cooling heat transfer surface (81) of the subcooling eliminating portion (8). , A rectangular parallelepiped or a triangular prism.
In the invention, the cooling heat transfer surface (8)
The shapes of 1) and the barrier portion (82) are not limited to FIGS. FIGS. 15 to 18 show modifications of the above embodiment. Each of the odd-numbered figures is a vertical sectional view, and each of the even-numbered figures is a transverse sectional view corresponding to the preceding figure. FIG.
5, FIG. 16 shows a cooling heat transfer surface (81) of the subcooling eliminating section (8).
Has a cylindrical shape, protrudes into the pipeline, and is surrounded by a hollow cylindrical barrier portion (82) larger than the supercooling elimination portion (8), and one of the barrier portions (82) The end is closed in contact with the subcooling eliminating portion (8), and the other end is open. FIGS. 17 and 18 show the supercooling elimination section (8).
The cooling heat transfer surface (81) has a cylindrical shape, and the return line (5)
1B), and a plate-like barrier portion (82) is provided upstream and downstream of the water or aqueous solution on the cooling heat transfer surface (81). Also in these modified examples, the flow rate of the water or the aqueous solution is slowed and the temperature is sufficiently lowered, so that the cooling capacity of the subcooling elimination section (8) is high, and the supercooling is efficiently eliminated. Further, since the flow rate of the water or the aqueous solution is not reduced, the flow of the produced icy substance does not deteriorate, so that the return pipe (51) is not blocked. In addition,
The supercooled state of the whole water or aqueous solution can be eliminated without cooling the whole water or aqueous solution because iced products are formed in the depression (83), and the iced products become nuclei.
In the embodiments according to the first and second aspects of the present invention, without recooling the whole water or aqueous solution,
The reason why the supercooled state of the water or the aqueous solution can be eliminated is that iced matter is formed inside the recessed part (83) or the barrier part (82) of the present invention, and this iced matter becomes a core.

The embodiment according to the third aspect of the present invention is the same as the embodiment according to the first or second aspect of the present invention, except that the freezing is performed near the cooling heat transfer surface (81) of the subcooling eliminating section (8). A heating heat transfer surface (91) of the prevention unit (9) is provided.
FIGS. 19 and 20 show an embodiment according to the first aspect of the present invention, in which an antifreeze section (9) is provided. The freezing prevention part (9) adjacent to the supercooling elimination part (8) can dissociate the adhered icy matter generated in the supercooling elimination part (8) to the tube wall. Clogging due to the adhesion and growth of water can be prevented. In particular, since the supercooling elimination section (8) according to the embodiment of the first or second aspect of the present invention has a high cooling capacity, the cooling heat transfer surface (81) can be reduced. Therefore, the heating heat transfer surface (91) of the adjacent freeze prevention unit (9)
Can also be reduced. Here, as a means for heating the heating heat transfer surface (91), the heating heat transfer surface (81) is heated by a heat medium introduced from the refrigerant inlet end (96) of the freeze prevention unit (9), and the heat medium is frozen. The liquid flows out from the refrigerant outlet end (97) of the preventing portion (9). The antifreeze section (9) and the supercooling elimination section (8) of this embodiment are double circular tubes, and the heat medium is supplied to the antifreeze section (9) outside the supercooling elimination section (8). Through the space, the refrigerant flows from the refrigerant inlet end (96) of the freeze prevention unit (9) to the refrigerant outlet end (97) of the freeze prevention unit (9). Also,
As means for cooling the cooling heat transfer surface (81), the cooling heat transfer surface (81) is cooled by the refrigerant introduced from the refrigerant inlet end (86) of the subcooling elimination unit (8), and the refrigerant is supercooled. The refrigerant is discharged from the refrigerant outlet end (87) of (8). As the heat medium and the refrigerant, it is desirable to use the refrigerant circuit (2) of the cooling device (1) as in the invention of claim 5, but the invention of claim 3 provides a separate heating and cooling device and The cooling device (1) is not limited to the one using the refrigerant of the refrigerant circuit (2).
FIGS. 21 and 22 show a modification of the embodiment according to the third aspect of the present invention, which is an embodiment according to the second aspect of the present invention in which an antifreeze section (9) is provided.

According to a fourth aspect of the present invention, in the above-described first or second aspect of the present invention, the cooling device (2) is used as a cooling heat source for cooling the subcooling eliminating section (8). In the embodiment shown in FIG. 2, after the elimination bypass path (85) is connected to the freezing prevention section (9), the subcooling elimination section (8) is used.
In this embodiment, the anti-freezing part (9)
The elimination bypass path (85) is directly connected to the subcooling elimination section (8) except for the above. Specifically, as shown in FIG. 23, the elimination bypass path (85) branched from the liquid pipe section (35) on the outlet side of the outdoor heat exchanger (12) as a condenser is connected to a decompression section (85). C4), it is connected to the subcooling elimination section (8), and the outlet end of the supercooling elimination section (8) is connected to the low-pressure section (25) on the suction side of the compressors (11) and (21). is there. That is, the refrigerant liquid whose temperature has been lowered by the decompression unit (C4) is caused to flow to the subcooling elimination unit (8) to cool the water or the aqueous solution. Therefore, there is no need to provide a separate cooling device.

According to a fifth aspect of the present invention, in the embodiment of the third aspect of the present invention, a cooling device is used as a heat source for cooling the supercooling eliminating section (8) and heating the antifreezing section (9). The liquid refrigerant branched from the refrigerant circuit (1) of (2) is used. As shown in FIG. 2 and FIG. 24, the liquid pipe on the outlet side of the outdoor heat exchanger (12) as a condenser is used. The elimination bypass path (85) branched from the section (35) is connected to the refrigerant inlet end (96) of the freeze prevention section (9), and the refrigerant outlet end (97) of the freeze prevention section (9) is further connected to the decompression section (C).
4), the refrigerant inlet end (8) of the subcooling elimination section (8).
6), and the refrigerant outlet end (87) of the subcooling eliminating section (8) is connected to the low pressure section (25) on the suction side of the compressors (11) and (21). That is, the condensed liquid refrigerant is used for heating the pipe wall adjacent to the supercooling elimination unit (8) by the antifreezing unit (9), and the temperature of the liquid refrigerant is further reduced by the decompression unit (C4) to reduce the temperature. The water or the aqueous solution is cooled by flowing to the cooling canceling section (8). Therefore, there is no need to provide a separate heating and cooling device. FIG. 25 and FIG.
Reference numeral 6 denotes a main part of each modification of the embodiment according to the fifth aspect of the present invention. In the embodiment of FIG. 25, a capillary tube is used as the pressure reducing section (C4), and the outlet end of the capillary tube (C4) as the refrigerant inlet end (86) of the subcooling eliminating section (8) is used in order to reduce the cooling loss. It is provided near the cooling heat transfer surface (81). The embodiment of FIG.
As 4), an orifice provided on a wall surface between the supercooling eliminating section (8) and the freeze preventing section (9) is used. In this embodiment, the refrigerant outlet end (97) of the freeze prevention unit (9), and the refrigerant inlet end (8) of the decompression unit (C4) and the supercool elimination unit (8).
6) is so close and practically integral that the structure is simplified. In the embodiments according to these inventions, it is possible to eliminate the supercooled state of the water or the aqueous solution without recooling the whole of the water or the aqueous solution.
3) or ice is formed inside the barrier portion (82);
This is because the iced material becomes a nucleus.

[0028]

As described above, according to the first aspect of the present invention, the cooling heat transfer surface (81) of the subcooling elimination unit (8) for eliminating the supercooling state is used in the return pipe (51B). By forming a dent portion (83) bulging outward with respect to the inner surface of the pipe and using the inner surface of the dent portion (83), the flow rate of water or aqueous solution is slowed down at the dent portion (83), and After the temperature has dropped, it flows away, so that the cooling capacity can be improved. Further, the flow rate of the water or the aqueous solution is controlled by the depression (83).
, And can be kept fast as a whole, so that the flow of the icy matter generated in the subcooling elimination section (8) does not deteriorate, and there is no clogging in the return pipe (51B).
In addition, since the supercooling can be efficiently eliminated by the concave portion (83), the cooling heat transfer surface (81) of the supercooling eliminating portion (8) can be reduced, or a particularly low-temperature cold heat source does not need to be prepared. .

According to the second aspect of the present invention, the flow of the water or the aqueous solution is hindered by providing the barrier section (82) around the cooling heat transfer surface (81) of the subcooling eliminating section (8). The temperature is reduced at a position in contact with the heat transfer surface (81), and flows away after the temperature is sufficiently lowered, so that the cooling capacity can be improved.
Further, the flow rate of water or aqueous solution is controlled by the cooling heat transfer surface (81).
, And can be kept fast as a whole, so that the flow of iced matter generated in the subcooling elimination section (8) becomes worse, and it is possible to prevent the flow in the return pipe (51B) from being blocked. Absent. Further, since the supercooling can be efficiently eliminated by the supercooling elimination section (8) having the barrier section (82), the cooling heat transfer surface (81) of the supercooling elimination section (8) can be made small, or particularly, at a low temperature. It is not necessary to prepare a cold heat source.

According to the third aspect of the present invention, in addition to the first or second aspect of the present invention, the ice formed in the subcooling eliminating section (8) is provided near the subcooling eliminating section (8). A freezing prevention section (9) for heating the return pipe (51B) so as to dissociate the adhesion of the compound to the pipe wall prevents freezing of the supercooling elimination section (8) and the pipe wall in the vicinity thereof. In addition, the ice making efficiency of the subcooling eliminating section (8) is improved. In particular, the cooling heat transfer surface (8) of the subcooling elimination section (8) according to the first or second aspect of the present invention.
Since 1) can be made smaller, the heat transfer surface (91) of the anti-freezing portion (9) can also be made smaller.

According to a fourth aspect of the present invention, in addition to the first or second aspect, the main heat exchanger (22) is connected to the refrigerant circuit (1) of the cooling device (2), Since the liquid refrigerant in the refrigerant circuit (1) is decompressed in the decompression section (C4) and flows at a low temperature in the subcooling elimination section (8), it is not necessary to provide a separate cooling device, so that the size and cost of the apparatus can be reduced. Can be reduced.

According to the fifth aspect of the present invention, in addition to the third aspect of the present invention, the main heat exchanger (22) is connected to the refrigerant circuit (1) of the cooling device (2), In 9), the liquid refrigerant in the refrigerant circuit (1) is circulated, while the supercooling elimination section (8) is cooled by heat exchange with the refrigerant in the antifreezing section (9), and is further cooled in the decompression section (C4). Since the refrigerant which has been decompressed and cooled to a low temperature flows in the step (2), it is not necessary to provide a separate heating and cooling device, so that the size and cost of the device can be reduced. According to the invention of claim 6, supercooling
The cooling heat transfer surface (8)
1) is outside the pipe inner surface in the return line (51B).
Water or aqueous solution in the return pipe (51B)
A retaining portion (83) is formed and provided on the inner surface of the retaining portion (83).
The flow rate of the water or the aqueous solution is reduced by the
Slows down and flows away after the temperature drops enough,
The cooling capacity can be improved. In addition, the flow rate of water or aqueous solution
Is slowed down only in this stagnation section (83), and as a whole
Occurred in the subcooling elimination section (8)
The flow of iced material deteriorates and blocks in the return line (51B).
There is no such thing. In addition, the efficiency of the stay (83)
Since supercooling can be eliminated well, the cooling
The heat transfer surface (81) can be made smaller, or especially a cold heat source
Need not be prepared.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a basic configuration of an ice making device of the present invention.

FIG. 2 is a refrigerant piping system diagram showing an embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a main part showing an embodiment of the invention of claim 1;

FIG. 4 is a cross-sectional view of a main part showing an embodiment of the invention of claim 1;

FIG. 5 is a vertical sectional view of an essential part showing an embodiment of the invention of claim 1;

FIG. 6 is a cross-sectional view of an essential part showing an embodiment of the invention of claim 1;

FIG. 7 is a longitudinal sectional view of an essential part showing an embodiment of the invention of claim 1;

FIG. 8 is a cross-sectional view of a main part showing an embodiment of the invention of claim 1;

FIG. 9 is a longitudinal sectional view of an essential part showing an embodiment of the invention of claim 1;

FIG. 10 is a cross-sectional view of a main part showing an embodiment of the first invention.

FIG. 11 is a vertical sectional view of an essential part showing an embodiment of the invention of claim 1;

FIG. 12 is a cross-sectional view of a main part showing an embodiment of the first invention.

FIG. 13 is a longitudinal sectional view of a main part showing an embodiment of the invention of claim 2;

FIG. 14 is a main part transverse sectional view showing an embodiment of the invention of claim 2;

FIG. 15 is a vertical sectional view of an essential part showing an embodiment of the invention of claim 2;

FIG. 16 is a main part transverse sectional view showing an embodiment of the invention of claim 2;

FIG. 17 is a longitudinal sectional view of an essential part showing an embodiment of the invention of claim 2;

FIG. 18 is a main part transverse sectional view showing an embodiment of the invention of claim 2;

FIG. 19 is a vertical sectional view of a main part showing an embodiment of the third invention.

FIG. 20 is a main part transverse sectional view showing an embodiment of the invention of claim 3;

FIG. 21 is a longitudinal sectional view of a main part showing an embodiment of the invention of claim 3;

FIG. 22 is a main part transverse sectional view showing an embodiment of the invention of claim 3;

FIG. 23 is a longitudinal sectional view of an essential part showing an embodiment of the invention of claim 4;

FIG. 24 is a longitudinal sectional view of a main part showing an embodiment of the invention of claim 5;

FIG. 25 is a longitudinal sectional view of a main part showing an embodiment of the invention of claim 5;

FIG. 26 is a vertical sectional view of an essential part showing an embodiment of the invention of claim 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerant circuit 2 Cooling device 5 Ice storage tank 8 Supercooling elimination part 9 Freezing prevention part 22 Main heat exchanger 25 Low pressure part 35 Liquid pipe part 51B Return line 81 Cooling heat transfer surface of supercooling elimination part 82 Supercooling elimination part 83 Depressed portion of supercooled elimination part 85 Elimination bypass passage 86 Refrigerant inlet end of supercooled elimination part 87 Refrigerant outlet end of supercooled elimination part 96 Refrigerant inlet end of antifreeze part 97 Refrigerant outlet end of antifreeze part C4 Decompression section

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-2-97893 (JP, A) JP-A-63-14063 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25C 1/00 F24F 5/00

Claims (6)

(57) [Claims] An ice storage tank (5) for storing a slurry of ice or water or an aqueous solution, and a main heat exchanger (superheater) connected to a cooling device (2) for supercooling the water or the aqueous solution. 2
2) and a flow path in a return pipe (51B) connecting the main heat exchanger (22) and the ice storage tank (5) to eliminate a supercooled state of water or an aqueous solution. In an ice making device provided with a supercooling elimination part (8) for making slurry-like iced material, a dent part (83) bulging outward with respect to the inner surface of the pipe in the return pipe (51B) is formed. An ice making apparatus characterized in that an inner surface of the recess (83) is used as a cooling heat transfer surface (81) of the subcooling eliminating portion (8). 2. An ice storage tank (5) for storing icy slurry in the form of water or an aqueous solution, and a main heat exchanger connected to a cooling device (2) for supercooling the water or the aqueous solution. 2
2) and a flow path in a return pipe (51B) connecting the main heat exchanger (22) and the ice storage tank (5) to eliminate a supercooled state of water or an aqueous solution. In an ice making device provided with a supercooling elimination section (8) for converting into a slurry-like iced material, the icemaking apparatus is provided around a cooling heat transfer surface (81) of the supercooling elimination section (8), and is provided with water or an aqueous solution. Set the flow velocity to the cooling heat transfer surface (8
An ice making device comprising a barrier portion (82) for locally slowing in (1). 3. A return pipe (51B), which is provided adjacent to the subcooling elimination section (8), and heats the return pipe (51B) so as to dissociate the adhesion of the hydrate generated in the supercooling elimination section (8) to the tube wall. The ice making device according to claim 1 or 2, further comprising an anti-freezing portion (9). 4. The cooling device (2) includes a compressor (11),
(21) a refrigerant circuit (1) in which a condenser (12), a pressure reducing mechanism (23), and a main heat exchanger (22) acting as an evaporator are sequentially connected. The supercooled water or aqueous solution is cooled by heat exchange with the refrigerant of the refrigerant circuit (1), and the liquid inlet (35) of the refrigerant circuit (1) and the refrigerant inlet of the supercool elimination unit (8). End (86)
Are connected via a pressure reducing section (C4), and the refrigerant outlet end (87) of the subcooling eliminating section (8) is connected to the low pressure section (25) of the refrigerant circuit (1). Claim 1
Or the ice making device according to claim 2. 5. The cooling device (2) includes a compressor (11),
(21) a refrigerant circuit (1) in which a condenser (12), a pressure reducing mechanism (23), and a main heat exchanger (22) acting as an evaporator are sequentially connected. The supercooled water or the aqueous solution is cooled by heat exchange with the refrigerant in the refrigerant circuit (1), and the antifreeze section (9) eliminates supercooling by heat exchange with the refrigerant in the refrigerant circuit (1). The pipe wall adjacent to the section (8) is heated, and the refrigerant inlet end (96) of the freeze prevention section (9) is connected to the liquid pipe section (35) of the refrigerant circuit (1), and the supercooling elimination section The refrigerant outlet end (87) of (8) is connected to the low-pressure part (25) of the refrigerant circuit, and the refrigerant outlet end (97) of the freezing prevention part (9) and the refrigerant inlet end (86) of the subcooling elimination part (8). 4. The ice making device according to claim 3, wherein the device is connected via a decompression unit (C4). 6. A slurry of iced water or aqueous solution is stored.
Ice storage tank (5) for storing and cooling device (2)
The main heat exchanger (2) for subcooling water or aqueous solution
2), the main heat exchanger (22) and the ice storage tank (5) are connected.
Is provided in the flow path in the return line (51B)
Eliminate the supercooled state of the aqueous solution to form slurry-like ice
Ice making device equipped with a supercooling elimination section (8)
Outside the inner surface of the pipe in the return pipe (51B).
Water or aqueous solution in the return pipe (51B)
Forming a retaining portion (83), and on the inner surface of the retaining portion (83),
The cooling heat transfer surface (81) of the supercooling elimination section (8) is provided.
An ice making device, characterized in that: