JPH0972583A - Thermal storage type cold water device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly melt ice in a thermal storage tank to utilize the cold heat effectively and sufficiently by improving the action at the time of a cold utilization operation in a cold water device of the ice thermal storage type. SOLUTION: In a thermal storage type cold water device in which ice 1 is produced around heat transfer tubes 7a in a thermal storage tank 60 and cooling water W is circulated between the tank 60 and a thermal load to take out cold while the ice I is being melted, an intake pipe 43 at a downstream side of an outward line 41 for introducing cooling water W from the thermal load to the tank 60 is introduced into the bottom of the tank 60 to change the direction of flow of the water W by means of a horizontal feed water port 43e provided in the pipe 43 so that the water W is mixed into the water W in the tank 60, whereby the influence of dynamic pressure on the water W, which is mixed into the tank, is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention stores ice as a cold heat source in a heat storage tank, melts the ice to take out cold water at a predetermined temperature, and cools the cold water to cool various equipment and cool indoors. Relating to a heat storage type cold water device for use in
Measures for smooth melting of ice when using cold heat.

[0002]

2. Description of the Related Art Conventionally, a so-called direct expansion type, as disclosed in Japanese Patent Laid-Open No. 6-74499, is known as one type of heat storage type cold water device. This type of heat storage type cold water device includes a chilling unit including a compressor, a condenser and the like, and a heat storage unit including a heat storage tank for storing water for ice making, and extends from the chilling unit in the heat storage tank of the heat storage unit. A heat transfer tube is provided. And
During the heat storage operation, water is cooled while evaporating the liquid refrigerant from the chilling unit in the heat transfer tube, ice is generated on the outer peripheral surface of the heat transfer tube, and cold heat is stored in the heat storage tank. Also, during cold heat utilization operation, water is circulated between the heat storage tank and the heat load so that the circulating water melts the ice around the heat transfer tubes while cooling heat is taken out from the heat storage tank to cool the heat load. I have to.

[0003]

By the way, in this type of heat storage type chilled water device, in order to effectively utilize the cold heat during the cold heat utilization operation and to efficiently extract the cold heat, the ice is smoothed over the entire heat storage tank. Need to be melted.

However, in the conventional configuration, for example, FIG.
As shown in Fig. 10, the water flow in the heat storage tank (a) is biased depending on the connection position of the water supply pipe (b) and the drain pipe (c) to the heat storage tank (a) (see the arrow in Fig. 10), which causes partial Remaining ice
(i) will occur. In this case, it cannot be said that the effective use of cold heat is sufficiently achieved, and cold water at a predetermined temperature cannot be taken out from the drain pipe (c), so there is a limit to improving the performance of the device.

The present invention has been made in view of these points. By improving the operation during cold heat utilization operation, the ice is smoothly melted in the heat storage tank, and the effective use of cold heat is sufficiently achieved. The purpose is to plan.

[0006]

In order to achieve the above object, the invention according to claim 1 eliminates the influence of the dynamic pressure on the water flow in the heat storage tank, and causes the water flow in the heat storage tank by static pressure. I did it.

Specifically, a heat storage tank (60) for storing the ice making liquid (W), and a heat transfer tube (7) immersed in the ice making liquid (W).
a), an inlet pipe (43) for introducing the ice making liquid (W) into the heat storage tank (60), and an outlet pipe (44) for leading out the ice making liquid (W) from the heat storage tank (60). And the above heat transfer tube (7
A heat exchange fluid is circulated in a), heat exchange is performed between the heat exchange fluid and the ice making liquid (W), and the ice making liquid (W) is cooled to below the freezing point and the heat transfer tube (7a ) Is used to store cold heat in the heat storage tank (60) by making ice on the outer peripheral surface, and during the operation utilizing cold heat, the liquid for ice making is stored in the heat storage tank (60) through the introduction pipe (43).
While introducing (W), the ice making liquid (W) is led out from the heat storage tank (60) by the outlet pipe (44), and ice (I) is made by the ice making liquid (W) flowing in the heat storage tank (60). It is premised on a heat storage type cold water device that takes out cold heat by melting. Then, the downstream end portion (43b) of the introduction pipe (43) is immersed in the ice-making liquid (W) in the heat storage tank (60), and the ice-making liquid (W) in the introduction pipe (43) is stored in the heat storage tank. The water supply hole (43e) introduced into the (60) is formed so as to penetrate the downstream end portion (43b) of the introduction pipe (43) in a direction substantially orthogonal to the extension direction thereof.

In such a structure, the ice making liquid (W) supplied from the introduction pipe (43) into the heat storage tank (60) is the introduction pipe (43).
After flowing along the extension direction of the downstream end part (43b) of the, the ice-making liquid (W) in the heat storage tank (60) passes through the water supply hole (43e) extending in a direction substantially orthogonal to this direction. Will be mixed in. In other words, due to the change in the flow direction, no dynamic pressure acts on the ice-making liquid (W), and the ice-making liquid (W) is introduced into the heat storage tank (60) only by the static pressure. Therefore, the drift of the ice-making liquid due to the influence of the dynamic pressure as in the conventional case is avoided, and the ice-making liquid (W) flows evenly in the heat storage tank, and the generation of local residual ice is prevented.

According to a second aspect of the present invention, in the heat storage type cold water device according to the first aspect, the introduction pipe (43) is provided with a pipe member (43c) whose lower side is opened, and the bottom face (60a) of the heat storage tank (60). ) To form a liquid supply path (A) for ice making between the two (43c, 60a), and the water supply hole (43e) is provided to the pipe member (43).
The side part (43d) of c) is formed so as to penetrate horizontally.

With this structure, it is possible to manufacture the introducing pipe (43) having a simple structure and capable of obtaining the operation according to the invention described in claim 1.

According to a third aspect of the present invention, in the heat storage type cold water apparatus according to the first aspect, the upstream end portion (4) of the outlet pipe (44) is
4b) is immersed in the ice-making liquid (W) in the heat storage tank (60), and the pipe member (44c) whose lower side is opened is attached to the bottom surface (60) of the heat storage tank (60).
a), the liquid discharge channel for ice making (B) between the two (44c, 60a)
The pipe member (44c) is provided with a drainage hole (44e) horizontally formed through the side portion (44d) of the pipe member (44c).

With this configuration, even in the portion where the ice-making liquid (W) is taken out from the heat storage tank (60), the ice-making liquid (W) can be evenly flowed in the heat storage tank (60). (6
The occurrence of local residual ice around the extraction part in 0) is avoided.

According to a fourth aspect of the present invention, a plurality of storage chambers are provided in the heat storage tank so that air bubbles are supplied to each storage chamber during the cold heat utilization operation. The supply state of bubbles was changed depending on the presence or absence of.

Specifically, a heat storage tank (60) having a plurality of storage chambers (6b, 6b '...) And storing the ice making liquid (W) in each storage chamber (6b, 6b'...); The heat transfer tubes (7a, 7a ', ...) immersed in the ice-making liquid (W) in each storage chamber (6b, 6b' ...) and the above storage chambers (6b, 6b '...) A bubble supply means (82) for supplying air from the bottom of the storage chamber (6b, 6b '...) is provided, and a heat exchange fluid is circulated through the heat transfer tubes (7a, 7a', ...) During the ice making operation. Heat exchange between the heat exchange fluid and the ice making liquid (W), the ice making liquid (W) is cooled to below the freezing point, and the outer peripheral surface of each heat transfer tube (7a, 7a ', ...) Cold heat is stored in the heat storage tank (60) by making ice in the storage chamber (6b, by the bubbles generated by the bubble supply means (82) during the cold heat utilization operation.
6b '…) Liquid for ice making in heat storage tank (60) while stirring the inside
It is premised on a heat storage type cold water device in which ice (I) is melted by (W) and cold water is taken out by drawing out this ice making liquid (W) from the heat storage tank (60). Then, the remaining ice amount detecting means (LS) for detecting the remaining ice amount in each of the storage chambers (6b, 6b '...) When it is detected that the residual ice is gone, the bubble supply operation of the bubble supply means (82) of the storage chamber (6b) is stopped, and the air supplied to the storage chamber (6b) is removed from the remaining storage chamber (6b). (6b ') is supplied to the bubble supply means (82), and the amount of bubble supply means (51) for increasing the amount of bubble supply to the remaining storage chamber (6b') is provided.

In such a structure, when the remaining ice amount is detected by the remaining ice amount detecting means (LS) in each of the storage chambers (6b, 6b '...) During the cold heat utilization operation, the bubble supply means (82)
To supply ice to each storage chamber (6b, 6b '…)
Promotes melting of (I). Then, when it is detected that the remaining ice is exhausted in a part of the storage chamber (6b), the operation of supplying bubbles to the storage chamber (6b) is stopped, and the storage chamber (6b) is stopped.
The air supplied to b) is supplied to the remaining storage chamber (6b ') to increase the amount of bubbles supplied to the remaining storage chamber (6b'). As a result, melting of the residual ice is promoted and local generation of residual ice is prevented throughout the heat storage tank.

According to a fifth aspect of the present invention, in the heat storage type cold water device according to the fourth aspect, the storage chambers (6b, 6b '...) Allow the ice making liquid (W) to flow through each other, and the cold heat utilization operation is performed. At some times, the ice (I) is melted while the liquid for ice making (W) is sequentially passed from the predetermined storage chamber (6b) to the other storage chamber (6b ').
In addition, the means for detecting the amount of remaining ice is used as the
The water level sensor (LS) detects the water level of (W) and detects the amount of residual ice based on the water level. Furthermore, the bubble amount adjusting means (51)
When the water level of the ice making liquid (W) in the heat storage tank (60) detected by the water level sensor (LS) reaches a predetermined water level or less, the operation of supplying bubbles to the upstream storage chamber (6b) is stopped, It is configured to increase the amount of bubbles supplied to the storage chamber (6b ') on the downstream side.

According to this structure, the detection of the water level by the water level sensor (LS) facilitates the complete melting of the ice (I) in the upstream storage chamber (6b) where the ice (I) easily melts. The storage chamber (6
The switching operation for increasing the bubble supply amount to b ') can be accurately performed.

[0018]

BEST MODE FOR CARRYING OUT THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described in detail below with reference to the drawings.

As shown in FIGS. 1 and 2, the heat storage type cold water device (10) is configured by connecting a heat storage unit (30) to a chilling unit (20) and produces a cooling water (W). Are configured.

The chilling unit (20) includes a compressor (21)
An oil separator (22), an air heat exchanger (23) that is a heat source side heat exchanger equipped with a fan (2F), a receiver (24), and a chilling side solenoid valve (SV-1), A capillary tube (25) that is an expansion mechanism and a water heat exchanger (26) that is a liquid heat exchanger are sequentially connected by a refrigerant pipe (2a). The water heat exchanger (26) is a shell-and-tube heat exchanger, one end of which is connected to the capillary tube (25) and the other end of which is connected to the suction side of the compressor (21). As shown in FIG. 2, an outward path (41) and a return path (42) of a water system (40) in which cooling water (W) that is an ice making liquid circulates are connected.

Further, the compressor (21) and each solenoid valve described later.
(SV-1, SV-2) and electric three-way valve (4V)
0), the controller (50) is connected to the compressor (21)
It is designed to control the operating capacity and the opening / closing operation of each valve (SV-1, SV-2, 4V).

The heat storage unit (30) includes a liquid side refrigerant pipe (3
L) and the gas side refrigerant pipe (3G) are connected to the chilling unit (20), and the heat storage unit (30) and the chilling unit (20) allow the refrigerant to circulate in a closed circuit refrigerant circuit.
It constitutes (11). And the liquid side refrigerant pipe (3L)
Is connected between the receiver (24) and the capillary tube (25) via a heat storage side solenoid valve (SV-2), while the gas side refrigerant pipe (3G) is connected via a one-way valve (CV). Connected to the suction side of the compressor (21).

In the heat storage unit (30), as shown in FIG. 3, the inside of the heat storage tank (60) in which the cooling water (W) is stored is divided into a plurality of storage chambers by partition plates (6a, 6a ', ...). It is divided into (6b, 6b, ...), and the heat storage heat exchangers (70, 70, ...) are stored in each storage chamber (6b, 6b, ...). This heat storage heat exchanger (7
0) is equipped with a heat transfer tube (7a) bent at multiple points,
As shown in Fig. 1, both ends of this heat transfer tube (7a) are connected to the liquid side refrigerant pipe (3
L) and the branch pipe (3L-a, 3G-a) of the gas side refrigerant pipe (3G), respectively. The liquid branch pipe (3L-a) is provided with a temperature-sensitive heat storage expansion valve (31), and a liquid is provided between the liquid branch pipe (3L-a) and the gas branch pipe (3G-a). A gas heat exchanger (32) is provided, and the gas branch pipe (3G-a) has a temperature sensing part (31-a) of the heat storage expansion valve (31) on the downstream side of the liquid gas heat exchanger (32). It is provided. In addition, each of the partition plates (6a, 6a ', ...) Has a first partition plate (6a) whose upper end is lower than the water surface of the cooling water (W).
And the lower end is higher than the bottom surface of the heat storage tank (60)
The partition plates (6a ') are alternately arranged. As a result, the respective storage chambers (6b, 6b, ...) Are in communication with each other via the space above or below the partition plate (6a, 6a '), and therefore, inside the heat storage tank (60). Cooling water (W) is stored in each storage chamber (6b, 6
It can flow between b,…). In this way, since the storage chambers (6b, 6b) communicate with each other, the storage chambers (6b, 6b)
The water levels of (b,…) coincide with each other, and this water level becomes higher as the amount of ice making in the entire heat storage tank (60) increases.

Further, as shown in FIG. 2, the inlet side and the outlet side of the heat storage tank (60) are connected to the outward path (41) of the water system (40), and the inlet side is connected by an electric three-way valve (4V). Outbound of water system (40) (41)
It is connected to the. Further, at the bottom of the heat storage tank (60) near the inlet side, there is a cooling water introduction pipe (43) as an introduction pipe connected to the outward path (41) of the water system (40), and at the bottom near the outlet side there is a water system.
Cooling water outlet pipe as an outlet pipe connected to the outward path (41) of (40)
(44) are provided respectively, the cooling water (W) introduced from the inlet side is introduced into the heat storage tank (60) from the cooling water introduction pipe (43), and the partition plates (6a, 6a ') After passing through the upper side or the lower side and flowing through each storage chamber (6b, 6b, ...) in order, it is led out from the outlet side through the cooling water lead-out pipe (44) (see arrow in FIG. 3). ).

The feature of this embodiment lies in the structure of the cooling water introducing pipe (43) and the cooling water discharging pipe (44). Further, the configurations of the cooling water introduction pipe (43) and the cooling water discharge pipe (44) are substantially the same, and therefore the configuration of the cooling water introduction pipe (43) will be mainly described here. This cooling water introducing pipe (43) is arranged at the bottom of the uppermost stream side storage chamber (6b) as shown in FIG. 3, and as shown in FIG.
A header portion (43a) connected to (41) and a plurality of water supply pipe portions (43b, 43b, ...) Connected to the lower end of the header portion (43a) are provided. The header section (43a) has a water pipe (4) whose upstream end constitutes the outward path (41) of the water system (40), as shown by a broken line in FIG.
While being connected to 1a), after extending downward from this connection position, it is slightly curved toward the center of the heat storage tank (60),
Width direction at the downstream end (left and right direction in FIGS. 4 and 6)
Water supply pipes (43b, 43b, 43b, 43b,
...) is connected. This water supply pipe part (43b) has a hat-shaped cross-section piping member (4
3c) is attached to the bottom plate (60a) of the heat storage tank (60) by means such as welding, and forms a cooling water flow passage (A) between the two (43c, 60a) (see FIG. 4). ). In addition, the piping member (43c) is closed at the tip (the end on the side opposite to the position where the header is connected), and the side surfaces (43d, 43d) facing each other in the width direction have , Small diameter water supply hole (43
, e) are formed so as to penetrate through the piping member (43c) at a plurality of positions at equal intervals in the longitudinal direction. Therefore, the water system
The cooling water (W) introduced into the cooling water introduction pipe (43) from the outward path (41) of (40) passes through the header part (43a) and the water supply pipe parts (43b, 4b).
3b, ...), and the water is supplied from the water supply pipes (43b, 43b, ...) to the heat storage tank (60) through the water supply holes (43e, 43e, ...). That is, as shown by the dashed-dotted line arrow in FIG. 6, in the water supply pipe portion (43b), after the flow direction of the cooling water flowing along the extension direction of the pipe member (43c) is changed by about 90 °, It is configured to be mixed with the cooling water in the heat storage tank (60).

Further, the cooling water lead-out pipe (44) is arranged at the bottom of the storage chamber (6b) on the most downstream side and has the same structure as the cooling water introduction pipe (43). To explain using this, the drainage pipe part (44b) is provided with a pipe part agent (44c) that forms a cooling water flow passage (B) with the bottom plate (60a) of the heat storage tank (60), and its side surface part. Multiple discharge holes (44e, 44e,
…) Is formed. In FIG. 5, (44a) is a drain side header part, and (41b) is an outlet side water pipe.

As shown in FIG. 2, the water system (40) has a circulation pump (4P) provided on the outward path (41) and is connected to a cooling unit (not shown) as a heat load. ing.
Then, the cooling water (W) flows into the water heat exchanger (26) from the return path (42) of the water system (40) to be cooled, and then the water system (40).
From the forward path (41) to the heat storage unit (30) in whole or in part via the electric three-way valve (4V), and after being cooled again, the forward path
Returning to (41), the cooling water from the water heat exchanger (26) and the cooling water from the heat storage unit (30) have a predetermined temperature (for example, 2 ° C.).
It will be merged so that it will flow to the cooling unit.

Further, the heat storage tank (60) is provided with a water level sensor (LS) for detecting the amount of residual ice, while the air system
(80) is connected. The air system (80) is an air pump.
The supply pipe (82) and the suction pipe (83) connected to the (81) are connected to the heat storage tank (6
0) and the supply pipe (82) is a one-way valve (CV1).
It is introduced into the lower part of the heat storage tank (60) via the. And
The air system (80) supplies bubbles to the cooling water (W) in the heat storage tank (60) to stir the cooling water (W) to promote ice making and deicing. Further, the supply pipe (82) is provided with a plurality of solenoid valves (SV-5, SV-6), and each storage chamber (6
b, 6b, ...) are operated by these solenoid valves (SV-5, SV
By the switching operation of -6), it is possible to switch between the bubble supply state and the supply stop state for each storage chamber (6b, 6b, ...).
The opening control of each of these solenoid valves (SV-5, SV-6) is performed by the bubble amount adjusting means (51) provided in the controller (50).

An overflow pipe is provided in the heat storage tank (60).
(6f) is provided to prevent the water level in the heat storage tank (60) from becoming higher than a predetermined water level. Also, the heat storage tank (60)
Is a drain pipe for discharging the cooling water (W) in the heat storage tank (60).
A make-up water pipe (6P) for supplying cooling water (W) is connected to the inside of (6d) and the heat storage tank (60), and one is connected to the drain pipe (6d).
Directional valve (CV2) and solenoid valve (SV-3), makeup water pipe (6P) is equipped with solenoid valve (SV-4), and these solenoid valves (SV-3, SV-4)
The cooling water (W) is supplied and drained with the switching operation of.

Next, the operation of the heat storage type cold water device (10) will be described. First, in heat storage operation, the chilling side solenoid valve (SV-1) is closed and the heat storage side solenoid valve (SV-2) is closed.
Is opened, the high pressure refrigerant discharged from the compressor (21) is condensed in the air heat exchanger (23) to become a liquid refrigerant, and the receiver (2
It is temporarily stored in 4). Then, the liquid refrigerant is used in the water heat exchanger.
It does not flow to (26) but flows to the heat storage unit (30) and is distributed to the heat transfer tubes (7a, 7a, ...) of each heat storage heat exchanger (70, 70, ...), and the heat storage expansion valves (31, 31). After decompressing with the heat transfer tubes (7a, 7)
a) is evaporated and becomes a gas refrigerant and returns to the compressor (21).

Then, each heat storage heat exchanger (70, 70, ...)
To exchange heat with the cooling water (W), cool the cooling water (W) and generate ice (I) on the surface of each heat transfer tube (7a, 7a, ...) (see Fig. 3) to store cold heat. It will be stored in the tank (60). The ice-making amount of the generated ice (I) uses the fact that the water level of the cooling water (W) rises as the ice-making amount increases.
It will be recognized by detecting the water level by S).

During the cooling operation utilizing the cold heat (cold heat utilization operation), the chilling side solenoid valve (SV-1) is opened, the heat storage side solenoid valve (SV-2) is closed, and the compressor ( The high-pressure refrigerant discharged from 21) is condensed in the air heat exchanger (23) to become a liquid refrigerant, and is temporarily stored in the receiver (24). afterwards,
The liquid refrigerant does not flow into the heat storage unit (30), is decompressed by the capillary tube (25) and evaporated in the water heat exchanger (26), and becomes a gas refrigerant and returns to the compressor (21). .

On the other hand, the cooling water is so-called feed water temperature controlled and flows from the return path (42) of the water system (40) to the water heat exchanger (26),
It is cooled by exchanging heat with the refrigerant, for example, cooling water is cooled to 7 ° C. Then, all or part of the cooling water exiting the water heat exchanger (26) flows into the heat storage tank (60) through the electric three-way valve (4V), that is, the cooling water cooled in the heat storage unit (30). And the cooling water cooled only by the water heat exchanger (26).

The cooling water flowing into the heat storage tank (60) is cooled while melting the ice (I) generated on the surface of the heat transfer tubes (7a, 7a, ...) And then cooled, and then the water system (40). Returning to the forward route (41), the cooling water cooled only by the water heat exchanger (26)
It joins with (W) and is controlled by cooling water (W) at 2 ° C., for example. The cooled cooling water (W) flows into the cooling section and exchanges heat with air or the like in the cooling section. Further, during this cooling operation, the air is supplied from the supply pipe (82) of the air system (80) to the storage chamber (6b,
Bubbles are supplied to the storage chambers (6b, 6b,…)
The stirring of the inside promotes the melting of ice.

During such a cooling operation, when the cooling water (W) is introduced from the cooling water introducing pipe (43) into the heat storage tank (60), as described above, the piping member (43c) After the flow direction of the cooling water flowing along the extension direction is changed by about 90 °, it will be mixed with the cooling water in the heat storage tank (60). Therefore, the mixed cooling water (W) is circulated. Pump (4
It is in a state where the influence of the dynamic pressure given by P) has almost disappeared and is mixed in the heat storage tank (60) only by the static pressure.
Further, since the mixed cooling water has a relatively higher temperature than the cooling water existing in the heat storage tank (60), this temperature difference causes the entire area of the storage chamber (6b) to float evenly. . Since the cooling water is supplied in this way, the cooling water (W) flowing in the heat storage tank (60) flows locally to only a part of the heat storage tank due to the dynamic pressure of the pump as in the conventional case. The situation that residual ice is generated in the
As the uneven flow of (W) is prevented, the ice can be uniformly and smoothly melted in the entire heat storage tank (60), and the effective utilization of cold heat can be sufficiently achieved. Further, it is possible to avoid generation of local residual ice at the end of the cooling operation, so that it is possible to avoid blocking of ice at the time of ice making again, and thereby it is possible to effectively utilize cold heat.

On the other hand, in the cooling water outlet pipe (44), the cooling water (W) is evenly flowed and discharged through the entire area of the most downstream storage chamber (6b). The uneven flow of cooling water in the inside can be avoided, and local residual ice can be prevented from occurring.

In this embodiment, the holes of the piping members (43c, 44c) are
(43e, 44e) was formed through the horizontal direction.
It may be formed on the upper surface of c, 44c).

(Second Embodiment) Next, a second embodiment according to the present invention will be described. Since the configuration and the heat storage operation of the heat storage type cold water device of the present embodiment are substantially the same as those of the above-described first embodiment, description thereof will be omitted.

The feature of this embodiment is that during the cooling operation (cooling heat utilization operation), the supply pipe (8) of the air system (80) is
It is in the bubble supply operation from 2). Here, in order to make it easier to understand the ice making operation, the inside of the heat storage tank (60) has two storage chambers.
The case of being partitioned into (6b, 6b ') will be described. And in this embodiment, before starting the heat storage operation, the heat storage tank (60)
Recognize the water level in the absence of ice (I) as the initial water level in advance.

In the cooling operation, the cooling water returned from the heat load passes through the upstream storage chamber (6b) and then flows into the downstream storage chamber (6b '). While the melting of ice (I) is promoted in the storage chamber (6b) of the above, almost no ice (I) is melted in the storage chamber (6b ') on the downstream side. In the present embodiment, utilizing such characteristics, while estimating the amount of residual ice in each storage chamber (6b, 6b ') by the water level, the solenoid valve (SV-5, SV-6) of the air system (80) Switch the supply pipe (82)
The bubble supply operation from is changed.

Specifically, at the beginning of the cooling operation, as shown in FIG.
As shown in, the upstream storage chamber (6b) and the downstream storage chamber
(6b ') Both solenoids (SV-5,
Both SV-6) are opened and air bubbles are supplied to each storage chamber (6b, 6b ') to melt ice (I) while improving the efficiency of collecting cold heat. Then, when this cooling operation is continuously performed for a predetermined time and the remaining ice amount becomes equal to or less than the predetermined amount, it is determined that there is no remaining ice in the upstream storage chamber (6b) as shown in FIG. Upon determination, the solenoid valve (SV-5) of the supply pipe (82) of the upstream storage chamber (6b) is closed to stop the supply of bubbles to the upstream storage chamber (6b). Along with this, all the air discharged from the air pump (81) is supplied to the storage chamber (6b ′) on the downstream side. In other words, the amount of bubbles supplied to the storage chamber (6b ') on the downstream side is increased, whereby the stirring operation inside the storage chamber (6b') on the downstream side is increased, and the storage chamber (6b ') on the downstream side is increased. 6b ')
Melting of ice (I) can be performed evenly and quickly. The water level for determining that there is no residual ice in the upstream storage chamber (6b) is the initial water level (the water level when there is no ice in the heat storage tank) and the water level at the start of cooling operation. When the water level drops to the intermediate position (when the melting rate reaches 50%), the bubble supply switching operation is performed.

As described above, in the present embodiment, the bubbles are not supplied to the portion where the ice (I) is completely melted, but the bubbles are intensively supplied to the storage chamber (6b ') containing the residual ice. Therefore, the ice can be uniformly and smoothly melted in the entire heat storage tank (60), and the effective use of cold heat can be sufficiently achieved. Also,
Also in this embodiment, it is possible to avoid local residual ice from being generated at the end of the cooling operation, and thus it is possible to avoid blocking of ice during ice making again.

In each of the above-described embodiments, the inside of the heat storage tank is divided into two or four storage chambers, but the present invention may be applied to a heat storage tank in a divided state other than these. .

Further, the present invention is applicable not only to the direct expansion type cold water device but also to the interexpansion type cold water device.

[0045]

As described above, according to the present invention, the following effects can be obtained. According to the invention of claim 1, the downstream end portion of the introduction pipe for introducing the ice-making liquid into the heat storage tank is immersed in the ice-making liquid in the heat storage tank, and the introduction pipe is substantially extended in the extending direction thereof. Since the water supply hole extending in the orthogonal direction is formed so as to penetrate the water supply hole, the flow direction of the ice making liquid introduced into the heat storage tank is changed so that the ice making liquid is not subjected to dynamic pressure. In addition, the drift of the ice-making liquid due to the influence of the dynamic pressure as in the conventional art is avoided. Therefore, the ice can be uniformly and smoothly melted in the entire heat storage tank, and the effective use of cold heat can be sufficiently achieved. In addition, since it is possible to avoid local residual ice from being generated at the end of the cold heat utilization operation, it is possible to avoid blocking of ice during ice making again, and it is possible to effectively utilize the cold heat.

According to the second aspect of the invention, the introduction pipe is
Since the piping member whose lower side is opened is attached to the bottom surface of the heat storage tank so as to form the liquid supply path for ice making therebetween, the effect according to the invention of claim 1 described above with a simple configuration. It is possible to manufacture an introduction pipe capable of obtaining the above, and to improve the practicality of the introduction pipe.

According to the third aspect of the invention, since the lead-out pipe for leading out the ice making liquid from the heat storage tank has the same structure as the above-mentioned introduction pipe of the first and second aspects, the heat storage tank is used for making ice. Even in the part where the liquid is taken out, the ice-making liquid can be made to flow evenly in the heat storage tank, and it is possible to avoid the occurrence of local residual ice around the take-out part in this heat storage tank, and to block the ice when re-making ice. Can be avoided, and effective use of cold heat can be achieved.

According to the invention described in claim 4, when it is detected that the remaining ice is depleted in the storage chamber during the cold heat utilization operation, the bubble supply operation to the storage chamber is stopped, and the storage chamber is supplied with the bubbles. Since the air that has been stored is supplied to the remaining storage chamber to increase the amount of bubbles supplied to the remaining storage chamber, the ice can be uniformly and smoothly melted throughout the heat storage tank, It is possible to sufficiently utilize the cold heat. Further, it is possible to avoid generation of local residual ice at the end of the cooling operation, so that it is possible to avoid blocking of ice during ice making again.

According to the invention of claim 5, the remaining ice amount is detected by detecting the water level in the heat storage tank by the water level sensor,
When the detected water level reaches or falls below a predetermined water level, the bubble supply operation to the upstream storage chamber is stopped and the amount of bubble supply to the downstream storage chamber is increased, so that the water level sensor detects the water level. By this, it is possible to easily recognize that the ice has completely melted in the upstream storage chamber where the ice is likely to melt, and the switching operation that increases the bubble supply amount to the downstream storage chamber where the residual ice is likely to occur. Can be done accurately. Therefore, the reliability of the bubble supply switching operation can be improved, and the effect according to the invention described in claim 4 can be more reliably obtained.

[Brief description of drawings]

FIG. 1 is a refrigerant piping system diagram of a heat storage type cold water device according to an embodiment.

FIG. 2 is a water piping system diagram of a heat storage type cold water device.

FIG. 3 is a sectional view showing the internal structure of the heat storage tank.

4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a view on arrow V in FIG.

FIG. 6 is a plan view showing a peripheral portion of a cooling water introducing pipe according to the first embodiment.

FIG. 7 is a view showing a sectional shape of a piping member.

FIG. 8 is a diagram for explaining a bubble supply operation at the initial stage of a cooling operation in the second embodiment.

FIG. 9 is a diagram for explaining an operation when switching a bubble supply state.

FIG. 10 is a diagram showing a conventional ice melting operation.

[Explanation of symbols]

 (10) Heat storage type cold water system (43) Cooling water inlet pipe (44) Cooling water outlet pipe (43b) Water supply pipe part (44b) Drain pipe part (43c, 44c) Piping member (43d, 44d) Side part (43e) Water supply hole (44e) Drain hole (51) Bubble amount adjusting means (60) Heat storage tank (6a) Bottom plate (6b) Storage chamber (7a) Heat transfer pipe (W) Cooling water (liquid for ice making) (I) Ice (A, B) Cooling water flow passage

Claims (5)

[Claims] 1. A heat storage tank (60) for storing an ice making liquid (W)
And a heat transfer pipe (7a) immersed in the ice making liquid (W), and an introduction pipe (4) for introducing the ice making liquid (W) into the heat storage tank (60).
3) and a lead-out pipe for leading out the ice-making liquid (W) from the inside of the heat storage tank (60).
(44) and, during the ice making operation, a heat exchange fluid is circulated through the heat transfer tube (7a) to perform heat exchange between the heat exchange fluid and the ice making liquid (W), Cool the working liquid (W) to below freezing point and
Cold heat is stored in the heat storage tank (60) by performing ice making on the outer peripheral surface of a), and during the operation utilizing cold heat, the ice making liquid (W) is introduced into the heat storage tank (60) through the above-mentioned introduction pipe (43). While using the outlet pipe (44), the heat storage tank
A heat storage type cold water device in which the ice making liquid (W) is derived from the inside of the (60) and the cold heat is taken out by melting the ice (I) by the ice making liquid (W) flowing in the heat storage tank (60). In, the downstream end portion (43b) of the introduction pipe (43) is immersed in the ice making liquid (W) in the heat storage tank (60), the ice making liquid (W) in the introduction pipe (43) The water supply hole (43e) introduced into the heat storage tank (60) is
A heat storage type cold water device characterized in that it is formed so as to penetrate the downstream end portion (43b) of the introduction pipe (43) in a direction substantially orthogonal to the extension direction thereof. 2. The introduction pipe (43) has a pipe member (43c) whose lower side is opened on the bottom surface (60a) of the heat storage tank (60).
0a) is formed so as to form an ice making liquid supply path (A) between the water supply holes (43e) and the piping member (43c).
The heat storage type cold water device according to claim 1, wherein the side part (43d) is formed so as to penetrate therethrough in the horizontal direction. 3. The upstream end portion (44b) of the outlet pipe (44) is immersed in the ice making liquid (W) in the heat storage tank (60), and the piping member (44c) whose lower side is opened stores heat. On the bottom (60a) of the tank (60),
It is attached so as to form a liquid discharge passage (B) for ice making between the two (44c, 60a).
On the side (44d) of the
e) is provided, The heat storage type cold water apparatus of Claim 1 characterized by the above-mentioned. 4. A heat storage tank (6) comprising a plurality of storage chambers (6b, 6b '...) And storing the ice making liquid (W) in each storage chamber (6b, 6b' ...).
0), the heat transfer tubes (7a, 7a ', ...) immersed in the ice making liquid (W) in the storage chambers (6b, 6b' ...), and the storage chambers (6b, 6b '...). The storage chambers (6b, 6
b '...) with a bubble supply means (82) for supplying air from the bottom, and during the ice making operation, a heat exchange fluid is circulated through each of the heat transfer tubes (7a, 7a', ...) to perform the heat exchange. Perform heat exchange between the working fluid and the ice-making liquid (W), cool the ice-making liquid (W) to below freezing, and perform ice-making on the outer peripheral surface of each heat transfer tube (7a, 7a ', ...). Cold heat is stored in the heat storage tank (60) by the heat storage tank (60) while agitating the inside of the storage chamber (6b, 6b '...) by the bubbles generated by the bubble supply means (82) during the cold heat utilization operation. Melt ice (I) with the ice-making liquid (W) in
In the heat storage type cold water device in which cold heat is taken out by drawing out this ice making liquid (W) from the heat storage tank (60), the residual ice for detecting the amount of remaining ice in each of the storage chambers (6b, 6b '...) The amount detection means (LS) and the residual ice amount detection means (LS) during cold heat operation
When it is detected that there is no residual ice in b), the storage chamber
The bubble supply operation of the bubble supply means (82) of (6b) is stopped, and the air supplied to this storage chamber (6b) is retained in the remaining storage chamber (6b ').
Of the remaining storage chamber (6b ') by supplying to the bubble supply means (82) of
And a bubble amount adjusting means (51) for increasing the bubble supply amount to the heat storage type cold water device. 5. Each of the storage chambers (6b, 6b '...) Is capable of circulating an ice making liquid (W) with each other, and during a cold heat utilization operation, from a predetermined storage chamber (6b) to another storage chamber (6). The ice (I) is melted while flowing the ice making liquid (W) in order toward 6b '), and the residual ice amount detecting means is the ice making liquid (W) in the heat storage tank (60). A water level sensor (LS) for detecting the water level of, and detecting the amount of residual ice based on the water level, wherein the bubble amount adjusting means (51) is a heat storage tank (60) detected by the water level sensor (LS). When the water level of the ice making liquid (W) in the inside reaches a predetermined level or below, the bubble supply operation to the upstream storage chamber (6b) is stopped and the amount of bubble supply to the downstream storage chamber (6b ') is stopped. The heat storage type cold water device according to claim 4, wherein the heat storage type cold water device is increased.