JP2005300045A - Ice heat storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ice heat storage device capable of preventing ice small pieces from flowing into the water sent to a cooling means, preventing the cooling means from being affected by impact shock when ice collapses in an ice storage tank, and stably making ice. <P>SOLUTION: In this ice heat storage device comprising the cooling means 5 for supercooling the water stored in an ice storage tank 1, a cushion area 16 partitioned by a first suction filter 17 composed of a filtering material such as a metallic mesh is sectioned around an intake opening for the water sent from the ice storage tank to the cooling means, a second suction filter 18 composed of the filtering material such as the metallic mesh is mounted on an intake opening body 2 attached to the intake opening, the first suction filter and the second suction filter are separated by the cushion area, the first suction filter is coarser than the second suction filter, and a water circulating area of the first suction filter is larger than that of the second suction filter. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an ice heat storage device that generates ice slurry from supercooled water, stores the ice slurry in an ice storage tank, and supplies cold heat to a load side using water in the tank as a cold heat source.

  The ice heat storage device supplies cold energy to the load side by circulating water in the tank between the inside of the ice tank and the load side using the cold heat of the ice stored in the ice storage tank as a cold heat source. In the ice heat storage device, there is a dynamic type that supplies ice from the outside to the ice storage tank, and in this dynamic type, water in the ice storage tank is sent to cooling means outside the tank to generate ice, The generated ice is returned to the ice storage tank.

  In the above-described dynamic type, water is supercooled in the cooling means, and then the supercooled water is shocked to release the supercooled state, so that a so-called sherbet-like mixture of fine ice pieces and water is mixed. The ice slurry is generated, and the ice slurry is stored in an ice storage tank.

Therefore, when taking out the water supplied to the cooling means from the ice storage tank from the inside of the tank, the punching metal is formed in a cylindrical shape in order to prevent the ice pieces from being sent to the cooling means. Intake pipes with a filter function that are sealed with punching metal or have a number of drilling holes (for example, 40% open area x about 4.0 mm hole diameter) made of synthetic resin such as vinyl chloride. It is attached to.
In addition, there exists a thing (refer patent document 1) of the structure which made the opening part of a water intake port partition with a metal mesh.

  As described above, the flow of the ice pieces into the cooling means is prevented when the ice pieces flow into the cooling means together with the water, and the ice pieces become ice nuclei inside the cooling means. This is because the ice is frozen before the cooling state is reached, and it becomes impossible to stably supply ice into the ice storage tank.

  However, even if a water intake tube having a filter function is provided at the water intake as described above, the effect of preventing the inflow of ice flakes is slight, and it cannot be said to be sufficient.

  There is also an ice heat storage device in which the water for generating ice is not a fresh water but an aqueous solution such as brine, so that low-temperature cold heat can be supplied to the load side as compared with the case where fresh water is used. In the case of using the above, the ice particles generated by the cooling means have a smaller diameter than in the case of fresh water, and it is more difficult to prevent ice pieces from flowing into the cooling means.

  It is possible to suppress the inflow of ice strips by providing a finer metal mesh or the like suction filter at the intake port mentioned above, but the suction filter made of finer metal mesh or the like is clogged by ice. In particular, since the fine ice that has just flowed into the ice storage tank has high fluidity in the tank, it is easily attracted to the water intake and accumulates, and clogging of the wire mesh or the like is likely to be promoted.

  In addition, the ice deposited on the suction filter tends to be dense due to the fine particles originally, and therefore the water intake resistance at the intake port when using an aqueous solution is larger than when using fresh water, and relatively ice storage. Even when the amount is small, poor water intake (pump cavitation) occurs.

  In addition, ice that has accumulated densely around the intake port may suddenly collapse due to the suction pressure and weight of the pump during the ice storage process. fluctuate.

The fluctuation in the flow rate reaches the supercooled water in the cooling means, and the supercooling state of the supercooling water is released inside the cooling means and freezes. This also prevents stable ice supply. .
Japanese Patent Laid-Open No. 10-160207 (pages 1 to 6 and FIGS. 2 to 5)

  The object of the present invention is to prevent the ice pieces from flowing into the water sent to the cooling means, and even if the ice collapses in the ice storage tank, the impact has almost no influence on the cooling means. An object of the present invention is to provide an ice heat storage device that can stably generate ice without giving it.

  In order to achieve the above object, an ice heat storage device according to the present invention is provided with a cooling means for supercooling water stored in an ice storage tank, and releases the supercooled state of the supercooled water to form fine ice. Ice storage device that generates ice slurry mixed with small pieces of water and stores this ice slurry in an ice storage tank, and sends the water or ice slurry in this ice storage tank to the load side to use as a cold heat source In addition, a cushion area partitioned by a first suction filter made of a filter material such as a wire mesh is provided around the intake port of water sent from the ice storage tank to the cooling means, and a metal mesh is attached to the intake port body attached to the intake port. A second suction filter made of a filter material such as a first suction filter and a second suction filter spaced apart by a cushion area, and the first suction filter being coarser than the second suction filter And the first suction pipe The flow area of water in the data than the second suction filter is as a configuration in which as a large becomes.

  Further, the ice storage tank has a configuration in which a slope that is inclined downward toward the water intake side is attached to the inner bottom surface of the ice storage tank, and the water intake is provided at a lower position in the ice storage tank.

  Furthermore, a top plate is provided in the upper part of the cushion area, and the top plate is configured by a downward slope from the inner side wall of the ice storage tank toward the center of the tank.

  According to the apparatus of the present invention, when the ice pieces in the ice storage tank pass through the first suction filter, since the surface area of the suction filter is large, the flow velocity of the ice filter is small. Since the first suction filter is not easily attracted to the first suction filter, and the first suction filter is rough, it is unlikely to be clogged. Most of the ice pieces that have passed through the first suction filter are melted while flowing through the cushion area, but the remaining ice pieces are not allowed to flow into the intake pipe in the second suction filter. Be blocked.

  Therefore, the inflow of ice pieces to the cooling means is reduced as much as possible, and stable cooling in the cooling means can be performed.

  In addition, even if the ice that has accumulated near the water intake has collapsed, a cushion area is provided between the first and second suction filters, so the liquid layer in this cushion area absorbs the shock caused by the ice collapse. Therefore, the flow rate fluctuation (load fluctuation) of the water sent to the cooling means is suppressed, freezing (supercooling failure) due to the release of the supercooling state of the supercooling water inside the cooling means is prevented, and the ice storage tank Ice can be supplied stably.

  Further, since the bottom of the inner bottom surface of the ice storage tank is provided with a gradient so that the water in the tank can easily flow in the direction of the water intake body, the ice storage ratio in the ice storage tank ( IPF) can be increased, the occurrence of water intake failure (pump cavitation) accompanying the decrease in the liquid ratio can be delayed, and the IPF in the ice storage tank can be increased.

  In addition, since the upper part of the cushion area is partitioned by a top plate and has a downward slope from the inner side wall of the ice storage tank toward the center of the tank, the first and second suction due to the ice load in the tank The filter can be prevented from being damaged, and the water in the tank easily flows down to the inner bottom of the ice storage tank due to the inclination of the top plate, which also enables smooth ice making.

Embodiments of an ice heat storage device according to the present invention will be described below in detail with reference to the accompanying drawings.
The other end of the intake pipe 3, one end of which is connected to the intake body 2 in the ice storage tank 1, is connected to the inlet of the supercooling heat exchanger 5 as cooling means via the intake pump 4. A nozzle 7 provided at the other end of the supercooled water pipe 6 having one end connected to the outlet of the heat exchanger faces the upper part in the ice storage tank 1.

  The supercooling heat exchanger 5 is supplied with refrigerant from a refrigerator (not shown) and is lower than the freezing point of the water in the ice storage tank 1 without freezing the water (brine). When the supercooled water is supplied to the ice storage tank 1 at the nozzle 7 or from the nozzle 7 to the ice storage tank 1, the supercooled state is released. Thus, an ice slurry, which is so-called sherbet-like ice in which fine ice pieces and water are mixed, is generated.

  Further, the other end of the cold water feed pipe 9 whose one end is connected to the water intake 8 provided separately from the water intake body 2 is connected to the cooling coil 13 of the air conditioner 12 provided in the cooled room 11 via the water supply pump 10. The other end of the water return pipe 14 connected to the inlet and connected to the outlet of the coil is opened in the ice storage tank 1.

  Thus, the inner bottom surface 1a of the ice storage tank 1 is inclined toward the intake body 2 and is provided in a cushion area 15 provided at the lowest position in the ice storage tank. The cushion area is partitioned by a top plate 16 having a downward slope from the inner side wall of the ice storage tank toward the center of the tank, and a first suction filter 17.

  As shown in the enlarged view of FIG. 2, the water intake body 2 is provided with a second suction filter 20 around the cylinder 19 having a large number of holes 18, 18, and is branched from the center of the cylinder 19. The intake pipe 3 is connected to the part 19a.

  Each of the first and second suction filters 17 and 20 is for preventing a small piece of ice 21 in the ice storage tank 1 from flowing into the intake pipe 3, and for example, a net such as a wire mesh. It consists of

  The first suction filter 17 is coarser than the second suction filter 20, and its surface area is much larger than the water intake opening area of the water intake body 2. The suction filter 17 is configured such that the flow rate of water is lower than the flow rate of the second suction filter 20.

Next, the operation of the apparatus of the present invention configured as described above will be described.
By driving the water intake pump 4, the water in the ice storage tank 1 passes through the first suction filter 17 and flows into the cushion area 15, and further passes through the second suction filter 20 to be the water intake body 2. It flows into the intake pipe 3 through the inside.

  When the ice pieces in the ice storage tank 1 pass through the first suction filter, since the surface area of the suction filter is large, the flow velocity of the ice pieces is small. Since the first suction filter is difficult to be attracted to the filter and is also coarse, clogging is also difficult, and there is almost no possibility that the water intake resistance is increased by the first suction filter.

  Further, most of the ice pieces that have passed through the first suction filter 17 are melted while flowing through the cushion area 15, but the remaining ice pieces remain in the intake pipe in the second suction filter 20. Inflow is prevented.

  The water flowing into the intake pipe 3 is not frozen in the supercooling heat exchanger 5 and is cooled to a temperature lower than the freezing point of the water to be in a supercooled state. The supercooled state is released when the nozzle 6 is fed into the ice storage tank at the nozzle 7 or from the nozzle 7 to become an ice slurry, and is stored in the ice storage layer.

  Then, the water in the tank cooled to a low temperature by contact with the ice 21 stored in the ice storage tank 1 is sent to the cooling coil 13 of the air conditioner 12 by the cold water feed pipe 9 by driving the water pump 10. The air exchanged with the cold water in the coil is sent into the air-conditioned room, and the water after the heat exchange is returned to the ice storage tank by the water return pipe 14.

  In the apparatus having the above-described configuration, even if the ice accumulated around the intake port collapses, the liquid layer in the cushion area 15 between the first and second suction filters 17 and 20 is shocked by the ice collapse. Therefore, the flow rate fluctuation (load fluctuation) reaching the water supply pipe 3 is reduced as much as possible, and freezing (supercooling failure) due to the release of the supercooling state of the supercooling water in the supercooling heat exchanger 5 is caused. Thus, the ice supply to the ice storage tank 1 can be stably performed.

  In addition, the gradient of the bottom of the inner bottom surface 1a of the ice storage tank 1 makes it easier for water in the tank to flow toward the intake body, and therefore it is possible to increase the ice storage ratio (IPF) in the ice storage tank. In addition, it is possible to delay the occurrence of poor water intake (pump cavitation) associated with a decrease in the liquid ratio and increase the IPF in the ice storage tank.

Further, since the upper part of the cushion area 15 is partitioned by the top plate 16, it is possible to prevent the first and second suction filters 17 and 20 from being damaged by the load of the ice 21 in the tank.
In addition, since the top plate has a slope that goes down from the inner wall of the ice storage tank toward the center of the tank, the water in the tank tends to flow down to the bottom of the ice storage tank, which also makes smooth ice making Can do.

  Depending on the design of the ice heat storage device, the load of the ice 21 extending above the cushion area may be small. In such a case, the top plate 16 portion is also made of the same material as the first suction filter 17. There is also a case.

The block diagram which shows the Example of the ice thermal storage apparatus which concerns on this invention. The partially broken plan view which expands and shows the surroundings of a water intake body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ice storage layer 2 Water intake body 3 Water intake pipe 4 Water intake pump 5 Supercooling heat exchanger 6 Supercooling water pipe 7 Nozzle 8 Water intake 9 Cold water feed pipe 10 Water supply pump 11 Cooled room 12 Air conditioner 13 Cooling coil 14 Water Return pipe 15 Cushion area 16 Top plate 17 First suction filter 18 Hole 19 Cylindrical body 20 Second suction filter 21 Ice

Claims (3)

  A cooling means for supercooling the water stored in the ice storage tank is provided, and the supercooled state of the supercooled water is canceled to generate an ice slurry in which fine ice pieces and water are mixed. In an ice heat storage device that stores slurry in an ice storage tank and sends the water or ice slurry in the ice storage tank to the load side and uses it as a cold heat source, around the intake port of water sent from the ice storage tank to the cooling means And providing a cushion area partitioned by a first suction filter made of a filter material such as a wire mesh, and providing a second suction filter made of a filter material such as a wire mesh on a water intake body attached to the water intake port. The filter and the second suction filter are separated by a cushion area, and the first suction filter is configured with a coarser mesh than the second suction filter, and the water flow area in the first suction filter Larger than 2 suction filters Ice thermal storage apparatus comprising as shall.   The ice heat storage device according to claim 1, wherein the ice storage tank is provided with a slope inclined downward toward the water intake side on the inner bottom surface of the ice storage tank, and the water intake is provided at a lower position in the ice storage tank.   The ice heat storage device according to claim 1, wherein a top plate is provided at an upper portion of the cushion area, and the top plate is configured to have a downward slope from the inner side wall of the ice storage tank toward the center of the tank.

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