JPH043867A - Ice making device - Google Patents

Abstract

PURPOSE:To perform a predetermined cold heat accumulation while simplifying a configuration of a water pipe of a water circulation passage by a method wherein a return pipe passage at a downstream side of a main heat exchanger is provided with an over-cooling eliminating part for eliminating an over-cooled state of water or aqueous solution over-cooled by the main heat exchanger and making it into a slurry ice form. CONSTITUTION:When water in a heat accumulating tank 5 or the like is forcedly circulated and over-cooled with a main heat exchanger 22 to make ice, a return pipe 51B at a down stream of the main heat exchanger 22 is provided with an over-cooling eliminating part 8 for eliminating the over-cooled state of the over-cooled water or the like and making it into slurry ice form, so that either water or iced aqueous solution is circulated in an ice accumulation tank 5 under its slurry form and then the ices are stored in the ice storing tank 5. In this case, the over-cooled state of water or the like is eliminated in the midway of the return pipe passage 51B, so that there is no limitation of a duty that an over-cooling state eliminating part should be disposed near the ice storing tank 5 in its design, and a piping corresponding to a state of installing site can become possible and at the same time water or the like is not exposed to air, but circulated up to the ice storing tank 5, resulting in that no heat loss caused by a heat exchanging with air is found and an efficiency of ice making operation is improved.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention circulates water, etc. in the ice storage tank through a circulation path, performs heat exchange, and supercools the water, thereby producing slurry-like ice in the ice storage tank. This invention relates to an improvement in an ice-making device that stores chemical substances.

(Prior art) Conventionally, a water circulation path has been provided to circulate water in the ice storage tank between a heat exchanger installed in a refrigerant circuit and an ice storage tank. For example, as an ice making device that turns water in a tank into slurry ice,
As disclosed in Japanese Patent Publication No. 217171, the outlet side of the water circulation path is an inclined gutter that faces downward on the upstream side and is formed such that the outlet end opens at a certain height above the water surface of the ice storage tank, and a heat exchanger is provided. A container is interposed between the gutters, and the water that has been cooled by the heat exchanger in the water circulation path is removed from the supercooled state at the outlet of the gutters and becomes frozen into a slurry, and this frozen product is stored in an ice storage tank. It is a known technique to prevent the water circulation path from freezing due to the progress of water freezing by dropping the water.

In addition, as disclosed in Japanese Utility Model Application Publication No. 1-112345, the outlet end of the water circulation path is opened above the ice storage tank, and an inclined gutter with a baffle plate is installed in front of the outlet end, and a heat exchanger is used for supercooling. By releasing the water into the atmosphere and colliding with the baffle plate, the supercooled state of the water is eliminated and the water turns into ice, which then falls into the ice storage tank through the gutter, making it more reliable. Techniques that attempt to prevent water circulation paths from freezing are also known.

(Problem to be solved by the invention) However, in the latter of the above conventional ones,
Because a supercooling elimination section is provided above the ice storage tank,
If the distance between the heat exchanger and the supercooling elimination section is long, there is a risk that the supercooling state will be eliminated in the piping between them. Therefore, since the heat exchanger must be provided near the ice storage tank, there is a problem in that there are significant design restrictions, such as making it difficult to bend the water pipes or otherwise process them.

On the other hand, in the former of the above-mentioned conventional systems, it is necessary to install a gutter with a considerable height difference above the ice storage tank as a supercooling eliminating section, which again imposes a large design restriction. In addition, since the exposure time to the atmosphere is long, there is a problem in that a large amount of heat is wasted due to heat exchange with the atmosphere.

The present invention has been made in view of the above points, and its main purpose is to provide a means to eliminate the supercooled state of water, etc. in the middle of the circulation path, and to send the frozen material in the form of slurry to the ice storage tank. By this, while simplifying the configuration of water piping in the water circulation path,
The objective is to store heat in a predetermined manner.

Another object of the present invention is to eliminate supercooling of water in the middle of the circulation path, since ice formation tends to progress along the pipe walls where the flow velocity is slow. Focusing on the fact that freezing occurs near the pipe walls of heat exchangers, which causes a decrease in heat exchange efficiency, we effectively prevent freezing of heat exchangers by taking measures to prevent ice from forming on the pipe walls. It's about doing.

(Means for Solving the Problems) In order to achieve the above object, the first solution of the present invention, as shown in FIG. An ice storage tank (5) for storage, a main heat exchanger (22) connected to a cooling device for supercooling water or an aqueous solution, and the main heat exchanger (22) and an ice storage tank (5).
) for circulating water or aqueous solution between
1A) and a return pipe (51B).

The return pipe (51) downstream of the main heat exchanger (22) is
B) is provided with a supercooling elimination section (8) that eliminates the supercooled state of the water or aqueous solution supercooled in the main heat exchanger (22) and freezes it into a slurry.

As shown in FIG. 1 (including the broken line portion), the second solution includes, in addition to the configuration of the first solution, a main heat exchanger (22) and a supercooling elimination section (8). Return pipeline between (51B
) is provided with a freeze progress prevention part (
7).

A third solution is the same as the second solution, but in which the freeze progress prevention section (7) heats the return pipe (51B).

A fourth solution, as shown in FIG. 2, uses a refrigerant circuit (1) of an air conditioner as the cooling device in the configuration of the second solution.

The freeze progress prevention section (7) is constituted by a heat exchanger that heats the return pipe through heat exchange with the refrigerant of the refrigerant circuit (1).

As shown in FIG. 5, a fifth solution is a configuration in which the main heat exchanger (22) and the freeze progress prevention section (7) are provided integrally in the configuration of the fourth solution. be.

A sixth solution, as shown in FIG. 6, is the same as the fifth solution, except that the freeze progress prevention section (7) has a double pipe structure.

A seventh solution is, as shown in FIGS. 7 and 8, in which the main heat exchanger (22) and the freeze progress prevention section (7) have a shell end tube type structure in the fifth solution. The structure has a double tube plate at the tube end.

The structure is such that the freeze progress prevention section (7) is interposed between the double tube plates.

The eighth solution is as shown in FIG. In the configuration of the sixth or seventh solving means, the main heat exchanger (two
2) is configured such that a supercooling eliminating section (8) is provided integrally therewith.

The ninth solution is shown in FIGS. 5, 6, and 7.

As shown in FIGS. 8 and 9, the above-mentioned 4. 5th゜6th
．． In addition to the configuration of the seventh or eighth solution means, the main heat exchanger (22) is integrated with a preheating section (6) for preheating the water or aqueous solution supplied to the main heat exchanger (22). It is installed in the opposite direction.

As shown in FIG. 3, a tenth solution is to prevent the progress of freezing in the second solution by forming a part of the return pipe (51B) with a tube (71) made of a heat insulating material. This consists of part (7).

The eleventh solution is as shown in FIG.
In this solution, the freezing progress prevention part (7) is provided with fins (72) for performing heat exchange with the air on the outer periphery of the return pipe (51B).

As shown in FIG. 3, the twelfth solution is the same as the second solution, in which an anti-icing material is provided on the inner wall of the return pipe (51B), and the freezing progress prevention part (7) is It is composed of

A thirteenth solution is that in the second solution, the inner wall of the return pipe (51B) is formed of a porous tube (74) containing oil such as sintered metal, thereby preventing the progress of freezing. (7).

(Function) With the above configuration, in the invention of claim (1), the heat storage l6
When the water, etc. in (5) is forced to circulate and is supercooled and frozen in the main heat exchanger (22), the supercooled water is transferred to the return pipe (51B) on the downstream side of the main heat exchanger (22). Since a supercooling elimination section (8) is provided that eliminates the supercooled state of water etc. and freezes it into a slurry, the iced water or aqueous solution is circulated in the slurry in the ice storage tank (5). The ice is stored in an ice storage tank (5).

At that time, since the supercooled state of water, etc. is eliminated in the middle of the return pipe (51B), there are design considerations such as having to provide a supercooling elimination section near the ice storage tank (5). There are no restrictions and piping can be configured according to the conditions of the installation site, and since water, etc. is circulated to the ice storage tank (5) without being exposed to the air, there is no heat loss due to heat exchange with the air.
Ice making efficiency will be improved.

In the invention of claim [2], in the return pipe (51B),
Immediately downstream of the supercooling elimination section (8) and the main heat exchanger (22), frozen matter will be generated due to the elimination of the supercooled state of water, etc., and will adhere to the pipe walls and progress toward the main heat exchanger (22). However, the frozen matter adhering to the pipe wall is dissociated in the freeze progress prevention part (7),
This will prevent a decrease in heat exchange efficiency due to freezing near the tube wall of the main heat exchanger (22). Therefore, the return pipeline (
Together with the supercooling elimination section (8) provided in the middle of the cooling section 51B), the cold storage heat efficiency is significantly improved.

In the invention of claim (3), in the invention of claim (2), the freezing progress prevention part (7)
is heated, the adhesion of frozen substances to the pipe wall of the return pipe (51B) is more reliably dissociated, and the effect of preventing the progress of freezing becomes significant.

In the invention of claim (4), the medium for supercooling water etc. in the storage heat exchanger (22) is the refrigerant of the refrigerant circuit (1) of the air conditioner, and the freeze progress prevention section (7) is the refrigerant of the refrigerant circuit (1). Since this is a heat exchanger that heats water etc. by heat exchange with the refrigerant (1), the amount of heat taken away due to heat exchange with the refrigerant is transferred to the refrigerant circuit (1).
), and the compressor input does not change, so power consumption is reduced compared to providing a separate heating source such as an electric heater.

In the invention of claim (5), in the invention of claim (4), since the main heat exchanger (22) and the freeze progress prevention section (7) are provided in one direction, the main heat exchanger ( 22), and both parties (22),
Integration of (7) simplifies piping design.

In the invention of claim (6), in the invention of claim (5), the main heat exchanger (22) and the freeze progress prevention part (7) are integrated with a double pipe structure, so that the outlet side Even if the flow of supercooled water is disturbed by the header, etc., and the supercooling state is resolved, the return pipe is restored by heat exchange between the refrigerant and water through the pipe wall of the small diameter pipe of the double pipe on the upstream side. (51B) is heated, and the resulting frozen product is prevented from progressing to the main heat exchanger (22).

In the invention of claim (7), in the invention of claim (5), the main heat exchanger (22) and the freeze progress prevention part (7) are integrated into a shell end tube structure, and the heat exchange efficiency is improved. do. Furthermore, in such a shell end tube structure, the flow stagnates near the tube end, the supercooling becomes strong, and the supercooling tends to be eliminated, but in the present invention, the end of the tube has a double tube plate structure, Since the tube section sandwiched between the double tube plates is used as the freeze progress prevention section (7), the vicinity of the tube end is heated.
Freezing near the pipe end due to flow stagnation is prevented.

In the invention of claim (8), since the main heat exchanger (22), the freeze progress prevention section (7), and the supercooling elimination section (8) are provided in the negative direction, slurry-like This makes it possible to generate frozen products, increasing the degree of freedom in piping design.

In the invention of claim (9), the above claims (4], (51)
, (6L (7) or (4), the preheating section (6L)
) are provided integrally with the main heat exchanger (22), thereby preventing the main heat exchanger (22) from freezing due to the inflow of ice kernels from the outgoing pipe (51A) side.

In the invention of claim 0 (11), the return pipe line (51B) between the main heat exchanger (22) and the supercooling elimination section (8) is made of a heat insulating member (
71), the low temperature of the supercooling elimination section (8) is prevented from being conducted to the main heat exchanger (22), and the progress of freezing to the main heat exchanger (22) is prevented. .

In the invention of claim (11), cold heat is released from the fins (72) provided on the outer periphery of the return pipe (51B) between the supercooling elimination section (8) and the main heat exchanger (22). Therefore, the progress of freezing due to the temperature rise of the return pipe (51B) is prevented.

In the invention of claim 02, since the inner wall of the return pipe line (51B) between the supercooling elimination section (8) and the main heat exchanger (22) is formed of the swimsuit prevention material, frozen products are prevented from returning. Pipeline (51B)
If it tries to adhere to the inner wall of the pipe, it will be repelled, preventing the progress of freezing.

In the invention of claim (13), since an oil film is always formed on the inner wall of the porous tube (74), frozen substances do not adhere to the porous tube (74), and the progress of freezing is prevented.

(Example) Hereinafter, an example of the present invention will be described based on the drawings from FIG. 2 onwards.

FIG. 2 shows the configuration of the refrigerant circuit (1) of the air conditioner of the first embodiment, where (1]) is the first compressor, and (12) is the first compressor.
An outdoor heat exchanger (13) is arranged on the discharge side of the compressor (11) and performs heat exchange between the refrigerant and outdoor air, and (13) adjusts the refrigerant flow rate of the outdoor heat exchanger (12) or reduces the pressure. In the outdoor electric expansion valve, the above-mentioned devices (11) to (13) are connected in series in a first conduit (14).

Further, (21) is a second compressor, (22) is arranged on the discharge side of the second compressor (21), and is used to generate main heat for supercooling the water or aqueous solution in the ice storage tank (5), which will be described later. The water heat exchanger (23) is a water-side electric expansion valve that adjusts the refrigerant flow rate when the water heat exchanger (22) functions as a condenser, and reduces the pressure of the refrigerant when it functions as an evaporator. The above-mentioned devices (21) to (23) are connected to the second pipe line (24).
are connected in series inside.

In addition, (SD+) and (SD: ) are the oil separators installed in the discharge pipes of each compressor (11) and (21), respectively, and (
C+), (C2) is each oil M container (SD+),
Oil return pipes (RT+), (RT2) provided from (SD2) to the suction side of each compressor (11), (21), respectively
) is a capillary tube for depressurization installed in each.

Further, (32) and (32) are indoor heat exchangers disposed in each room, (33) and (33) are indoor electric expansion valves as pressure reducing valves that reduce the pressure of refrigerant, and each of the above-mentioned devices (3
2) and (33) are each connected in series, and each set thereof is connected in parallel in the third conduit (34).

The first pipe line (14) and the second pipe line (24) are connected in parallel to the third pipe line (34), forming a closed circuit in which the refrigerant circulates.

Note that (Ac) is an accumulator provided in the third pipe line (34) on the suction side of each compressor (11), (21).

In addition, (2) connects the gas pipes of the outdoor heat exchanger (12) and the gas pipes of the indoor heat exchangers (32) and (32) to each compressor (
11), a four-way switching valve (2) that switches to communicate alternately with the discharge side or suction side of (21), and when the four-way switching valve (2) switches to the solid line side in the figure, the outdoor heat Exchanger (12) is a condenser, indoor heat exchanger (32), (32)
functions as an evaporator and performs cooling operation indoors, while when the four-way switching valve (2) switches to the side shown by the broken line in the figure, the outdoor heat exchanger (12) functions as an evaporator and the indoor heat exchanger (32) .

(32) functions as a condenser and performs heating operation indoors.

Furthermore, the gas pipes of the water heat exchanger (22) and each compressor (1
1), a branch path (
25), and a water side switching valve (26) that alternately connects the gas pipe of the water heat exchanger (22) to the discharge pipe of the second compressor (21) and the branch passage (25). There is. The water side switching valve (26) uses three boats of the four-way switching valve, and when the water side switching valve (26) switches to the solid line side in the figure, the water heat exchanger (22) The gas pipe is a branch path (25
) side, that is, the suction side of each compressor (11), (21), and the water heat exchanger (22) functions as an evaporator, while
When the water side switching valve (26) switches to the side shown by the broken line in the figure, the gas pipe of the water heat exchanger (22) communicates with the discharge pipe of the second compressor (21), and the water heat exchanger (22) It is designed to function as a condenser. Note that (C3) is a capillary tube interposed in the dead boat side piping of the water side switching valve (26).

Furthermore, a bypass path (3) is provided that connects the discharge pipes of the first compressor (11) and the second compressor (21), and the bypass path (3) is provided with the second compressor (21). A check valve (4) is provided that allows refrigerant to flow only from the discharge pipe side of the first compressor (11) to the discharge pipe side of the first compressor (11).

That is, the outdoor heat exchanger (12) and the water heat exchanger (22)
) functions as a condenser, and if the condensation temperature in the water heat exchanger (22) is high and the pressure is high, the discharge gas of the second compressor (2]) is released to the outdoor heat exchanger (12) side. This makes it possible to distribute the amount of heat dissipated.

Here, the air conditioner includes an ice storage tank (5
) is arranged, and the ice storage tank (5) and the water heat exchanger (2
2) is connected by a water circulation path (51) so that water or an aqueous solution can be circulated. The water circulation path (51) includes an outgoing pipe (51A) that supplies water etc. from the bottom of the ice storage tank (5) to the water heat exchanger (22), and an outgoing pipe (51A) that supplies water etc. from the bottom of the ice storage tank (5) to the water heat exchanger (22). It consists of an incoming pipe (51B) that returns frozen substances in the form of slurry such as water to the upper part of the water circulation pipe (51) by a pump (52) installed in the outgoing pipe (51A). The water or aqueous solution in the ice storage tank (5) is forced to circulate.

Further, on the downstream side of the pump (52) of the outbound pipe (51A) of the water circulation path (51), a strainer (
Further, a preheating heat exchanger (6) for preheating water and the like supplied to the water heat exchanger (22) is 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) that allows a part of the liquid refrigerant to bypass the water side electric expansion valve (23) and flow to the preheating heat exchanger (6). A preheating electric expansion valve (62) having a refrigerant pressure reduction function and a flow rate control function is provided on the downstream side of the preheating heat exchanger (6) in the preheating bypass path (61). The preheating electric expansion valve (
62) and the water side electric expansion valve (23), the refrigerant flow rate in the preheating bypass path (61) is adjusted, and the pressure of the refrigerant is also reduced during the ice making operation of the water heat exchanger (22). There is.

Here, as a feature of the present invention, in the return pipe (51B) of the water circulation path (51), on the downstream side of the water heat exchanger (22), the water, etc. of the return pipe (51B) is cooled. A recooler (8) is provided as a supercooling eliminating section that eliminates the supercooled state of water etc. that has been supercooled by the water heat exchanger (22), and the water heat exchanger (8) is further provided. A heat retention heat exchanger (7) is provided between the pipe and the water heat exchanger (22) as a freeze progress prevention part to prevent the freezing of the return pipe (51B) from progressing to the water heat exchanger (22). It is being

In addition, a heat retention bypass path (36) is provided for bypassing and circulating the liquid refrigerant from the liquid line of the refrigerant circuit (1) to the heat retention heat exchanger (7). A recooling bypass path (37) extends from the liquid line downstream of the heat retention bypass path (36), and the recooling bypass path (37) is used for recooling via a recooling capillary tube (C4). After being distributed to the container (8),
A branch path (25) that becomes the suction side of the compressors (11) and (21)
)It is connected to the.

That is, in the recooler (8), by heat exchange with the refrigerant depressurized in the recooling capillary tube (C4),
The supercooled water etc. is re-cooled by the water heat exchanger 15 (22), the supercooled state is eliminated, and the slurry is frozen.
Slurry-like frozen material is stored as ice via the return pipe (51B)
While circulating it to I (5), it is heated by heat exchange with the liquid refrigerant in the liquid line in the heat retention heat exchanger (7), and water, etc. It is designed to prevent frozen products generated by the elimination of supercooling from adhering to the pipe wall of the return pipe line (51B) and from progressing to the water heat exchanger (22).

When the air conditioner is operated to perform cooling operation indoors, the four-way switching valve (2) 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, the refrigerant discharged from each compressor (11), (21) is condensed in the outdoor heat exchanger (12). , each indoor heat exchanger (32), (32) performs evaporation to cool the room. In addition, the water side switching valve (26
) is switched to the dashed 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) flows to the water heat exchanger. (2
2), each is condensed and then transferred to each indoor heat exchanger (3).
2) and (32) for evaporation.

Moreover, when electricity is cheap, such as at night, a cold storage heat operation is performed in which cold heat is stored in the ice storage tank (5). That is, the four-way switching valve (2) and the water side switching valve (26) are switched to the solid line side in the figure, each indoor electric expansion valve (33) (3B) is closed, and each compressor (11), (21) is closed. After condensing the discharged refrigerant in the outdoor heat exchanger (12), the water side electric expansion valve (23) (or preheating electric expansion valve (62)) reduces the pressure and transfers it to the water heat exchanger (22).
), the water or aqueous solution in the ice storage tank (5) is supercooled, the water, etc. in the ice storage tank (5) is frozen, and cold heat is stored.

At that time, in the invention of claim (1), in the water circulation path (51) of the ice storage tank (5), the water heat exchanger (main heat exchanger) (
22) A water heat exchanger (22
) is provided with a recooler (supercooling elimination section) (8) that eliminates the supercooled state of water etc. that has been supercooled in the ice storage tank (5) and freezes it into a slurry. By forcedly circulating the frozen material in the form of a slurry, the frozen material in the form of a slurry can be stored in the ice storage tank (5), and cold energy can be stored.

At that time, since the supercooled state of water etc. is eliminated in the middle of the return pipe (51B), the ice storage tank (5) like the conventional one mentioned above is used.
There are no design constraints due to eliminating supercooling nearby, and piping can be done according to the conditions at the installation site, etc., and the ice storage tank (
5), there is no heat loss due to heat exchange with air, and therefore it is possible to improve the cold storage heat efficiency.

In the invention of claim (21), in the return pipe (51B),
A heat-retaining heat exchanger between the recooler (8) and the water heat exchanger (22) for disassociating frozen material from sticking to the pipe wall to prevent the progress of freezing to the water heat exchanger (22). (Freeze Progress Prevention Department)
(7), immediately downstream of the recooler (8) and the water heat exchanger (22), frozen matter is generated due to the elimination of the supercooled state of water, etc., and adheres to the pipe wall. Heat exchanger (22)
Even if the freezing of the pipe wall progresses to a maximum of
) can effectively prevent a decrease in heat exchange efficiency caused by freezing. That is, in the invention of claim (1) above,
Together with the provision of the recooler (8) for eliminating supercooling in the middle of the return pipe (51B), it is possible to significantly improve the cold storage heat efficiency.

In the inventions of claims (1) and (2), the supercooling eliminating section and the freezing progress preventing section are not limited to the configuration of the first embodiment. (81) is a protrusion provided on the pipe wall of the return pipe (51B), (82) is a bent portion provided immediately downstream of the protrusion (81), and 81), the area of the return pipe (51B) is narrowed to increase the flow velocity of water, etc., and the water, etc. collides at the bend (82) to eliminate the supercooled state of the water, etc. Further, (71) is a heat insulating member made of synthetic resin tubing that constitutes a part of the return pipe line (51B) between the protrusion (81) and the water heat exchanger (22), and the heat insulating member (71) prevents cold heat from being conducted from the supercooling eliminating section (8) to the water heat exchanger (22).

That is, in the invention of claim QO), the return pipe (51B)
Since a part of the water heat exchanger (71) is made up of the heat insulating member (71), it is possible to prevent the conduction of the low temperature of the supercooling eliminating section (8) to the water heat exchanger (22). 22) can be prevented from progressing to freezing.

Further, in this case, by using a resin material having water-repellent properties such as silicone resin or fluorocarbon resin, it is possible to effectively prevent frozen substances from adhering to the wall surface, that is, to prevent formation of swimsuits. That is, in the invention of claim (12), since the inner wall of the return pipe line (51B) is formed of the resin tube (71) which serves as a swimsuit prevention material, even if frozen substances come into contact with the pipe wall surface, the frozen substances will not be removed. The water between the wall and the wall is repelled from the wall, preventing frozen matter from adhering to the wall, thereby effectively preventing the progress of freezing.

In this case, the entire pipe does not need to be made of a water-repellent resin material; for example, silicone resin or the like may be applied to the inner wall.

In the invention of claim (3), in the invention of claim (2), the return pipe (51B) is heated by the heat retention heat exchanger (7) serving as the freeze progress prevention part, as in the above embodiment. Therefore, it is possible to more reliably dissociate frozen substances from the pipe wall of the return pipe (51B), and therefore, it is possible to exhibit a remarkable effect in preventing the progress of freezing.

It goes without saying that the means for heating the return pipe (51B) is not limited to the heat exchange with the refrigerant as described above, but may also be performed by, for example, heating with an electric heater or the like.

In addition, in each invention of the above-mentioned claims (1) to (3), the means for supercooling water etc. with the water heat exchanger (22) is not necessarily limited to the refrigerant circuit (1) of the air conditioner; For example, it goes without saying that water or the like may be supercooled in the water heat exchanger (22) via brine or the like.

In the invention of claim (4), the medium for supercooling water etc. in the water heat exchanger (22) is the refrigerant of the refrigerant circuit (1) of the air conditioner, and the insulating heat exchanger ( 7) heats water, etc. by heat exchange with the refrigerant in the refrigerant circuit (1), so it not only makes it possible to dissociate frozen substances from the pipe walls, but also reduces power consumption. be able to. That is, as shown in the Mollier diagram of Fig. 4, a cycle in which no protection against freezing is added (in other words, a cycle when there is no thermal insulation heat exchanger (7)) is indicated by ■-■ in the diagram.
-■-■ However, when the heat retention heat exchanger (7) is added, the cycle becomes ■-■-■'-■' in the figure, and ■
The amount of heat taken away by -■' will be recovered by -■'. Therefore, since the human power required for each compressor (11), (21) does not change, power consumption can be reduced compared to providing a separate heating source such as an electric heater.

Next, a second embodiment according to the invention of claims (5) and (6) will be described. FIG. 5 shows the refrigerant piping system in this embodiment, which is the same as the first embodiment except that the heat retention heat exchanger (7) is provided integrally with the water heat exchanger (22). The same is true. That is, as shown in FIG. 6, the water heat exchanger (22) includes a refrigerant pipe (22a) formed in a curved pipe shape and a small-diameter water pipe (51a) provided inside the refrigerant pipe (22a). The water circulation path (51) has a double pipe structure consisting of a water pipe (51a) on the outgoing pipe path (51A) side, and a double pipe is configured with a water pipe (51a) to conduct the refrigerant of the preheating bypass path (61). Preheating heat exchanger (6) that circulates
A refrigerant pipe (6a) and an inlet header (6b) on the inlet side of the refrigerant pipe (6a) are provided, while a water circulation path (5
On the return pipe (51B) side of 1), there is a refrigerant pipe (7a) which constitutes a double pipe with the water pipe (51a) and allows the refrigerant of the heat insulation bypass pipe (36) to flow, and the refrigerant pipe (7a). ) is provided with an outlet header (7b) on the outlet side of the water heat exchanger (22), a preheating heat exchanger (6) and a heat retention heat exchanger (
7) are integrally formed as one kit.

Therefore, in the invention of claim (5), the above claim (4)
) invention, a water heat exchanger (main heat exchanger) (22)
Since the and the heat retention heat exchanger (7) are provided in one direction, it is possible to effectively prevent the progress of freezing to the water heat exchanger (22), and the water heat exchanger (22), ( 7
) in one kit, the refrigerant circuit (1
) and the water circulation path (51) are simplified in design.

In the invention of claim (6), in the invention of claim (5), since the water heat exchanger (22) and the heat retention heat exchanger (7) are integrated with a double pipe structure, the header ( 7b
) etc. Even if the flow of supercooled water is disturbed and the supercooled state is resolved, the refrigerant pipe (7a) of the upstream heat retention heat exchanger (7)
The return pipe line (51B) is heated by heat exchange between the refrigerant and water through the pipe wall of the water pipe (51a), and the freezing of the resulting frozen product in the water heat exchanger (22) is effectively prevented. can be prevented.

Next, a third embodiment according to the invention of claim (7) will be described. FIG. 7 shows a water heat exchanger (22
), and the refrigerant piping system is the same as in the second embodiment above. In this embodiment, each heat exchanger (22), (
6),' (7) is the outer refrigerant pipe (22a),
(6a), (7a) and a large number of thin tube-shaped water pipes (5lb) installed inside the pipes, and has a so-called shell end tube structure. The end of the tube is divided into two disks (CP+) and (CP2) to form a double tube plate structure, and each double tube plate (CP+), (
The pipe portions sandwiched between CP: ) are used as a preheating heat exchanger (6) and a heat retention heat exchanger (7).

Therefore, in the invention of claim (7), the above claim (5)
), the heat exchangers (22) and (7) are integrated into a shell end tube structure, thereby improving heat exchange efficiency. Furthermore, in such a shell end tube structure, the flow stagnates near the tube end, and supercooling becomes strong, making it easy to eliminate supercooling, but in the present invention, the end has a double tube plate structure, Double tube plate (C
Since the tube section sandwiched between P+ ) and (CP2) is used as a thermal insulation heat exchanger (7), the vicinity of the tube end is heated, and freezing in the vicinity of the tube end due to elimination of supercooling can be effectively prevented. .

In addition, in the second and third embodiments, the water heat exchanger (21) has a curved pipe structure, but the water heat exchanger (22) may have a straight pipe structure.

FIG. 8 shows a modification of the third embodiment, in which a straight refrigerant pipe (22b) and a water pipe (
51C) is provided. Other configurations are listed in the second section above.
This is similar to the example. This modified example can also exhibit the same effects as the second or third embodiment.

Next, regarding the fourth embodiment according to the invention of claim (8),
explain. FIG. 9 shows a refrigerant piping system of an air conditioner according to a fourth embodiment. In addition to the configuration shown in FIG. 5 in the third embodiment, this embodiment includes a water heat exchanger (22), a preheating Exchanger (6), heat retention heat exchanger (7) and recooler (8)
) are integrally provided. The other configurations are the same as those of the third embodiment.

Therefore, in the invention of claim (8), each heat exchanger (2
2), (7), and (8) are provided integrally, so
A slurry-like frozen product can be produced within one casing. Therefore, the water heat exchanger (22) and the recooler (
8) and the water heat exchanger (22) using the frozen product generated in the recooler (8).
The water circulation path (51
), etc. can be improved.

In the invention of claim (9), the above claims (4) and (5)
, +6).

In the invention of (7) or (8), the water heat exchanger (22)
Since the preheating heat exchanger (6) for preheating the water etc. supplied to the system is integrally provided, in addition to the effects of the above-mentioned inventions,
It is possible to simplify the piping structure while effectively preventing freezing of the water heat exchanger (22) by melting ice nuclei contained in the water etc. supplied to the water heat exchanger (22).

In addition, in the above-mentioned first to fourth embodiments, the heat retention heat exchanger (
7), the liquid refrigerant from the liquid line of the refrigerant circuit (1) is made to flow, but the present invention is not limited to this example, and the refrigerant supply source in the invention of claim (4) As a result, refrigerant from each part of the refrigerant circuit (1) can be used.

FIGS. 10 to 12 respectively show first to third modifications of the fourth embodiment, in which the heat insulation bypass path (36) uses refrigerant from various parts of the refrigerant circuit (1).

In the first modification, as shown in FIG. 10, the second compressor (
A heat retention bypass passage (36) extends from the discharge pipe of the compressor (21) and returns to the suction side of each compressor (11), (21). That is, in the first modification, since the discharged gas is introduced into the insulation heat exchanger (7) via the insulation bypass passage (36), the amount of heating is increased, and there is an advantage that the effect of preventing the progress of freezing is large.

In the second modification, as shown in FIG. 11, the heat insulation bypass passage (36) is connected to the oil separator (SD2
) and return to its cavity tube (C2). In other words, the oil return pipe (RT2) is used. Therefore, in the second modification, the amount of heating can be increased similarly to the first modification, and since the ura return circuit is utilized, there is an advantage that the configuration is simpler.

In the third modification, as shown in FIG. 12, the heat insulation bypass passage (36) extends from the dead port of the water side switching valve (26) that switches the operation mode of the water heat exchanger (22), and extends from the capillary tube ( C4). Therefore, in the third modification as well, the amount of heating in the heat retention heat exchanger (7) can be increased by introducing the discharge gas, and the same advantages as in the second modification can be obtained.

Next, regarding the fifth embodiment according to the invention of claim Gll,
This will be explained based on FIG.

FIG. 13 shows a part of the water circulation path (51), and the refrigerant piping system diagram and the entire water piping are omitted. In the figure, a return pipe (51B) between the water heat exchanger (22) and the recooler (8) is shown.
) A large number of fins (72), . . . are provided on the outer periphery, and a fan (73) for blowing air is further attached to the fins (72), . i.e. fan (73)
The fins (72
)... to warm the return pipe (51B) to prevent freezing from progressing from the recooler (8) to the water heat exchanger (22). A part of the pipe (51B) and the fins (72) on the outer periphery constitute a freeze progress prevention section (7).

Therefore, in the invention of claim (11), the fin (72
),..., cold heat is released from the return pipe (51B) between the recooler (8) and the water heat exchanger (22), so the temperature of the return pipe (51B) can be effectively reduced. Therefore, the progress of freezing from the recooler (8) to the water heat exchanger (22) can be effectively prevented. Note that in the present invention, although the fan (73) is not necessarily required, the effect of preventing the progress of freezing can be more significantly exerted by blowing air from the fan (73).

Next, a sixth embodiment according to the invention of claim (13) will be described based on FIG. 14. In Figure 14, (7
4) is a porous tube that is provided between the water heat exchanger (22) and the recooler (8) and is made of sintered metal and serves as a freeze progress prevention part, and (75) is the porous tube. (74
) is an oil tank for supplying oil to the tank.

That is, in the invention of claim (13), since an oil film is always formed on the inner wall of the porous tube (74) containing oil, even if frozen matter occurs in the pipe, the frozen matter does not adhere to the wall surface. Therefore, the progress of freezing can be effectively prevented.

(Effects of the Invention) As explained above, according to the invention of claim (1), an ice storage tank for storing a slurry-like frozen product of water or an aqueous solution can be used for supercooling water, etc. In an ice making device in which a main heat exchanger is connected via an outgoing pipe line and an incoming pipe line, and water, etc. is circulated through the pipe line to form ice, water, etc. that has been supercooled by the main heat exchanger, etc. We installed a supercooling elimination section in the middle of the return pipe that eliminates the supercooled state and turns it into a slurry-like frozen product.
In addition to ensuring flexibility in piping design, it is possible to improve ice-making efficiency by returning frozen material in the form of slurry directly from the return pipe to the ice storage tank.

According to the invention of claim (2), in addition to the invention of claim (1), a freezing progress prevention part is provided between the supercooling elimination part of the return pipe and the main heat exchanger, and By preventing the ice from adhering to the pipe walls and preventing the progress of freezing to the main heat exchanger, it is possible to effectively prevent a decrease in heat exchange efficiency due to freezing of the main heat exchanger, and thus to improve ice making. Efficiency can be improved.

According to the invention of claim (3), in the invention of claim (2), since the return pipe is heated in the freeze progress prevention section, the adhesion of frozen substances to the pipe wall can be reliably separated by angle q. Therefore, the effect of the invention of claim (2) can be significantly exhibited.

According to the invention of claim (4), since the refrigerant in the refrigerant circuit of the air conditioner is used as the cooling source of the main heat exchanger, the input to the compressor of the air conditioner is not increased. , it is possible to perform heating to prevent the progress of freezing in the freeze progress prevention section, and thus it is possible to reduce power consumption.

According to the invention of claim (5), in the invention of claim (4), since the main heat exchanger and the freeze progress prevention section are integrally provided, it is possible to simplify the piping (& construction). can.

According to the invention of claim (6), in the invention of claim (5), since the main heat exchanger and the freeze progress prevention part have a double pipe structure, supercooling may occur due to flow turbulence at the pipe outlet etc. Even if the ice is removed and frozen matter is formed, the progress of freezing to the main heat exchanger can be effectively prevented.

According to the invention of claim (7), in the invention of claim (5), the main heat exchanger has a shell end tube structure, and the tube ends have a double tube sheet structure, so that freezing progress between the double tube sheets is prevented. Since the prevention portion is provided, it is possible to effectively prevent freezing due to flow stagnation at the tube end while improving the heat exchange rate due to the shell end tube structure.

According to the invention of claim (8), the above claim (5), (
6) Or (In the invention of Chikara, the supercooling elimination section is provided integrally with the main heat exchanger and the freeze progress prevention section, so it is possible to generate a slurry-like frozen product within a single casing, and the main It is possible to improve the degree of freedom in piping design while effectively preventing the progression of freezing to the heat exchanger.

According to the invention of claim (9), the above claim (41, +5
) +6), +7) or (8) In the invention, a preheating section for preheating water, etc. is provided on the upstream side of the main heat exchanger integrally with the main heat exchanger, so that main heat exchange by introducing ice nuclei is possible. The piping structure can be simplified while preventing the vessel from freezing.

According to the invention of claim QO), in the invention of claim (2), a part of the return pipe line is formed of a heat insulating material as the freeze progress prevention part, so that the flow from the supercooling elimination part to the main heat exchanger is The conduction of cold heat is prevented, and therefore, the progress of freezing can be effectively prevented.

According to the invention of claim (+1), in the invention of claim (2), fins for exchanging heat with the air are provided on the outer periphery of the return pipe as the freezing progress prevention part, so that the supercooling eliminating part The return pipe between the main heat exchanger and the main heat exchanger is heated, thus effectively preventing the progress of freezing.

According to the invention of claim 02), in the invention of claim (2), the inner wall of the return pipe is formed of a water stone prevention material as the freeze progress prevention part, so that hydrates do not adhere to the wall surface. Therefore, the progress of freezing can be effectively prevented.

According to the invention of claim (13), in the invention of claim (2), a part of the return pipe is made of an oil-containing porous tube such as sintered metal as the freeze progress prevention + Ix part. Since the oil film is always formed on the inner wall, it is possible to prevent frozen substances from adhering to the wall surface, thereby effectively preventing the progress of freezing.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the invention according to claims (1) to (3). Figures 2 to 4 show the first embodiment, Figure 2 is a cold tofu piping system diagram showing the configuration of the air conditioner, and Figure 3 is
The figure shows a longitudinal section of a part of the return pipeline according to the modified example.
FIG. 4 is a Mollier diagram for detailed explanation of the invention of claim (4), FIGS. 5 and 6 show the second embodiment, and FIG. 5 is a refrigerant piping system diagram of an air conditioner; FIG. 6 is a perspective view showing the double tube structure of the water heat exchanger, FIGS. 7 and 8 show the third embodiment, and FIG. 7 is a perspective view showing the bent shell end tube structure. Fig. 8 is a perspective view showing the straight shell end tube structure, Fig. 9 is a refrigerant piping system diagram of the air conditioner according to the fourth embodiment, and Figs.
Modifications of the embodiment are shown; FIG. 10 is a refrigerant piping system diagram of an air conditioner according to a first modification, FIG. 11 is a refrigerant piping system diagram of an air conditioner according to a second modification, and FIG. 12 is a diagram of a refrigerant piping system of an air conditioner according to a second modification. A refrigerant piping system diagram of an air conditioner according to the third modification, FIG. 13 is a front view showing a part of the water circulation path in longitudinal section according to the fifth embodiment, and FIG. 14 is a water circulation path according to the sixth embodiment. FIG. 1 Refrigerant circuit 5 Ice storage tank 6 Preheating heat exchanger (preheating section) 7 Heat retention heat exchanger (freezing progress prevention section) 8 Recooler (supercooling elimination section) 22 Water heat exchanger (main heat exchanger) 51A Conduit 51B Return conduit 71 Insulating tube 72 Fin 74 Porous tube refrigerant circuit Ice storage tank Preheating heat exchanger (preheating section) Heat retention heat exchanger (freezing progress prevention section) Recooler (supercooling elimination section) 22 Water heat Exchanger (main heat exchanger) 51A Outgoing pipe line 51B Return pipe line 71 Insulating tube 72 Fin 74 Porous tube

Claims (13)

[Claims] (1) An ice storage tank (5) that stores frozen slurry of water or an aqueous solution, a main heat exchanger (22) that is connected to a cooling device and supercools the water or an aqueous solution, and the main heat Exchanger (
an outgoing pipe (51A) and a return pipe (51B) for circulating water or an aqueous solution between the ice storage tank (5) and the ice storage tank (5), and a return pipe downstream of the main heat exchanger (22). (51B) and a supercooling eliminating section (8) that eliminates the supercooled state of the water or aqueous solution that has been supercooled in the main heat exchanger (22) and turns it into slurry. Featured ice making device. (2) Provided in the return pipe line (51B) between the main heat exchanger (22) and the supercooling elimination section (8), so as to prevent freezing from progressing to the main heat exchanger (22). The ice making apparatus according to claim 1, further comprising a freeze progress prevention part (7) for preventing the ice from adhering to the pipe wall. (3) The ice making apparatus according to claim (2), wherein the freeze progress prevention section (7) heats the return pipe (51B). (4) The cooling device is the refrigerant circuit (1) of the air conditioner, and the freeze progress prevention section (7) is a heat exchanger that heats the return pipe by heat exchange with the refrigerant of the refrigerant circuit (1). The ice making device according to claim (3). (5) The ice making apparatus according to claim (4), wherein the main heat exchanger (22) and the freeze progress prevention section (7) are provided integrally. (6) The ice making apparatus according to claim (5), wherein the freeze progress prevention section (7) has a double pipe structure. (7) The main heat exchanger (22) and the freeze progress prevention section (7) have a shell end tube type structure and are equipped with a double tube plate at the tube end, and the freeze progress prevention section (7) has the structure described above. The ice making device according to claim 5, wherein the ice making device is interposed between double tube plates. (8) Claim (5), (6) or (7), wherein the main heat exchanger (22) is integrally provided with a subcooling eliminating section (8).
The ice making device described. (9) The main heat exchanger (22) includes a preheating section (6) for preheating water or aqueous solution supplied to the main heat exchanger (22).
Claims (4), (5), (
6), (7), or the ice making device described in (8). (10) The ice making device according to claim (2), wherein the freeze progress prevention section (7) is formed by forming a part of the return pipe (51B) with a tube made of a heat insulating material. (11) The freeze progress prevention part (7) includes fins (72) for performing heat exchange with air on the outer periphery of the return pipe (51B),...
The ice making device according to claim (2), comprising: (12) The freezing progress prevention part (7) is a structure in which an anti-icing material is provided on the inner wall of the return pipe (51B).
The ice making device described in 2). (13) The freeze progress prevention part (7) connects a part of the return pipe (51B) to a porous tube (74) containing oil such as sintered metal.
) The ice making device according to claim (2).