JP3443508B2 - Ice storage device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice heat storage device for storing a heat source for air conditioning using latent heat of ice. 2. Description of the Related Art Generally, an ice heat storage device is used in a system for generating ice using inexpensive midnight power and performing cooling operation in the daytime by utilizing the cold heat of the generated ice. Have been. [0003] The ice heat storage devices are roughly classified into a static type in which hard ice is stored around a heat transfer tube and a dynamic type in which sherbet-shaped ice is stored according to a method of generating ice. [0004] An ice heat storage device using a dynamic type ice making method can perform additional ice making compared to a static type ice heat storage device, so that ice can be used efficiently, and further improvements and developments are underway. [0005] Among the dynamic ice storage devices,
In particular, a method of generating ice in the form of sherbet by cooling ice to a supercooled state and releasing the supercooled state in the tank tends to be frequently used because a large amount of ice can be stored at low cost. [0006] However, the sherbet-like ice generated in the dynamic type ice heat storage device has a bulk density, so that the size of the heat storage tank can be reduced in comparison with the static type heat storage tank. There is a drawback that it is difficult to achieve and the ice filling rate (ice making rate) cannot be increased. [0007] For example, Japanese Utility Model Publication No. 6-5535 discloses a dynamic type ice heat storage device, in which a supercooling release device is disposed above the water surface of a heat storage tank, so that the generated ice is stored in the heat storage device from the air. To fall. In this case, there is no problem in operation,
A large space for the supercooling release device is required above the heat storage tank, and there is a problem that the heat storage tank must be enlarged. Japanese Utility Model Publication No. 7-34267 also discloses an ice heat storage device. Here, a primary filter is provided opposite to the water intake of the heat storage tank so that ice chips that cause freezing in the supercooler do not enter the water pipe from the water intake. [0010] A main filter is provided in the middle of a water pipe connected to the water intake section, and a de-ice preventing water capture filter is provided as a secondary filter in order to prevent re-ice in the water pipe. However, in order to ensure a predetermined flow rate of water for a long period of time without clogging due to dust or impurities, it is necessary to ensure a large flow passage area for each filter. Then, since the nucleus of the ice that causes freezing is very small, the nucleus easily passes through the filter and does not particularly function as a water capture filter for preventing defrosting. Therefore, in Japanese Utility Model Publication No. Hei 6-41063, a heating device such as a heater is provided in the middle of a water pipe as a substitute for the above-mentioned trapping filter for preventing defrosting to prevent freezing due to mixing of ice nuclei into the supercooler. Is being planned. However, even in this case, a separate filter for ice chips and ice nuclei is required, and the risk of clogging still exists. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a compact ice heat storage device capable of sufficiently increasing an ice filling space and capable of increasing an ice making rate. Things. According to the present invention , there is provided an ice heat storage device having an opening at an upper surface for storing water or an aqueous solution and having a water intake section on a bottom wall. A pump that takes in water or an aqueous solution from the water intake section of the heat storage tank and feeds the water or an aqueous solution that is sent from the pump to exchange heat with a refrigerant in a refrigeration cycle and cools the refrigerant to a temperature below the freezing point. A supercooler for changing to cooling water, a nozzle for jetting supercooled water guided from the supercooler, and receiving the supercooled water jetted from the nozzle, cancels the supercooled state, and removes the generated ice as described above. A supercooling canceling body for supplying into the heat storage tank, the supercooling canceling body receiving supercooling water jetted from the nozzle, canceling a supercooled state and generating ice, and a heat storage tank. Partition the intake section inside In addition, a filter unit for conducting only water or an aqueous solution is integrally formed . By providing means for solving the above-mentioned problems, all of the upper part of the heat storage tank between the nozzle and the supercooled release body becomes an ice filling space, and the ice making rate is reduced. improves. In addition, the filter portion of the supercooling release body separates the heat storage tank into an ice filling space and a water filling space, and the pump can reliably take up water or an aqueous solution. [0018] In some embodiments, the entire area above the heat storage tank between the nozzle and the supercooling canceling member is an ice filling space, and the ice making rate is improved. In addition, the filter portion of the supercool release unit separates the heat storage tank into an ice filling space and a water filling space, so that the pump can reliably take water or an aqueous solution. Since the release portion is shared with the heat storage tank side wall, it can be further ice filling space and expansion I
You . Further, in some embodiments, the supercooled water supplied into the heat storage tank becomes a jet that expands straight, and the supercooled water can be supplied widely in the width direction of the heat storage tank. It is possible to achieve a higher ice making rate. Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a heat storage tank having an open upper surface, which stores water or an aqueous solution. On one side of the heat storage tank 1, a subcooling release body 2 described later is provided.
Is arranged. A water intake 3 which is a water intake is opened in the bottom wall 1a on the side where the subcooling cancellation body 2 is arranged. One end of a water pipe 4 is connected to the water intake 3. The other end of the water pipe 4 is connected to a nozzle 5 provided at the upper end of the side opposite to the side where the subcooling canceling body 2 is arranged. A pump 6, a water heater 7, a strainer 8 and a supercooler 9 are provided at predetermined intervals in the middle of the water pipe 4 from the water intake 3 side. The pump 6 sucks water or an aqueous solution in the heat storage tank 1 from the water intake port 3 and discharges the water or the aqueous solution to the water heater 7. The water heater 7 is, for example, a heater and is connected to the heater. Water or aqueous solutions can be heated. The strainer 8 only needs to have a filtering ability enough to capture impurities, dust and the like entering the water heater 7 and the subcooler 9. The supercooler 9 is a heat exchanger that is provided side by side with and integrated with an evaporator 11 that constitutes a refrigerator 10 described later. It is designed to be cooled until it reaches a cooling state. Although the nozzle 5 is provided directly on the outlet side of the supercooler 9 in the drawing, it may actually be mounted on the side wall of the heat storage tank 1 and communicated with the water pipe 4. on the other hand,
In the refrigerator 10, a compressor 13, a decompression device 14, and a condenser 15 are accommodated in a refrigerator main body 12. The evaporator 11 is disposed outside the refrigerator main body 12, and the compressor 13, the evaporator 11, the decompression device 14, and the condenser 15 are sequentially connected via a refrigerant pipe 16 to form a refrigeration cycle. You. Next, the subcooling canceling member 2 will be described in detail. The subcooling canceling body 2 is constituted by a simple rectangular plate body 20. The width of the plate 20 is substantially the same as the distance between the inner surfaces of the heat storage tank 1, and there is no gap between the plate 20 and the inner surface of the tank when the plate 20 is disposed in the tank 1. The upper end of the plate 20 is formed on one side wall 1b of the heat storage tank 1.
Although it abuts along the upper edge, the lower end rests on the bottom wall 1a at a position separated from the side wall. That is, the plate body 20 is accommodated in a state of being inclined with respect to the heat storage tank side wall 1b, and the water intake port 3 is located between the lower end portion and the heat storage tank one side wall 1b. The plate 20 is divided into a part immersed in water or an aqueous solution contained in the heat storage tank 1 and a part protruding from the water surface. The immersion portion below the water surface is provided with an opening 21 having almost the entire area thereof, and a filter portion 22 which is a mesh filter is provided in this opening. Therefore, the plate body 20 constituting the supercooling canceling body 2 partitions the intake port 3 side of the heat storage tank 1 into a triangular cross section, but the water or aqueous solution contained in the heat storage tank is filtered by the filter section 22. It is possible to freely conduct the inside of the tank through this. However, solids (here, ice pieces) having a diameter equal to or larger than the opening diameter of the filter unit 22 are prevented from flowing between the partitions by the filter unit 22. On the other hand, the portion above the water surface that is always exposed from the water surface remains plate-like, and serves as a release portion 23 for the supercooled water. The release unit 23 and the filter unit 2
2 are integrated and constitute the above-mentioned supercooling release body 2. The operation of the thus constructed ice heat storage device during the ice making operation is as follows. The ice making operation is performed using, for example, inexpensive midnight power. Pump 6 and compressor 13 in refrigerator 10
Is driven, and the pump 6 takes in water or aqueous solution from the water intake 3 of the heat storage tank 1 and sends it to the water heater 7 side. The water heater 7 heats the sent water or aqueous solution, so that the mixed ice chips are melted. Then, it is led to the strainer 8 to capture and remove impurities and dust, and is led to the supercooler 9 to be cooled by the refrigerator 10.
Is exchanged with the evaporator 11. Next, it is guided to the nozzle 5 and is ejected from the tip toward the heat storage tank side wall 1b, and is all collected in the tank. Then, the water is again taken from the water intake port 3 and circulates in the above-mentioned route. In the refrigerator 10, a refrigeration cycle operation is performed to cool water or an aqueous solution flowing through the supercooler 9. When the water or the aqueous solution is guided to the supercooler 9 in a state where the temperature of the water or the aqueous solution has decreased near the freezing point, the water or the aqueous solution is further cooled to a temperature lower than the freezing point, that is, a so-called supercooled state. This supercooled water or aqueous solution, that is, supercooled water, is guided to the nozzle 5 and jetted into the atmosphere.
The water or the aqueous solution jetted from the nozzle 5 flies over the opening on the upper surface of the heat storage tank 1 and collides with the releasing portion 23 constituting the supercooling releasing body 2 which is a position facing the nozzle 5. The supercooled water is released from the supercooled state by colliding with the release section 23, and is separated into water and sherbet-like ice. That is, newly generated water and sherbet-like ice are collected in the heat storage tank 1. The water or the aqueous solution in the heat storage tank 1 is freely conducted in the tank via the filter section 22 integrated with the release section 23, and is again guided from the water intake port 3 to the water pipe 4 to be described above. The route is circulated. The sherbet-like ice generated in the releasing section 23 is fixed to the releasing section as it is, but subsequently, the nozzle 5
The supercooled water is blown out from the water and ice is generated, so that the sherbet-like ice sticking to the release portion is enlarged. Eventually, it descends from the release portion 23 along the surface of the plate 20 by its own weight, and floats on the water surface in the heat storage tank 1. The process of forming sherbet-like ice in the heat storage tank 1 will be described with reference to FIG. In FIG. 1A, this is an early stage of ice making, and the generated sherbet-like ice floats on the surface of water or an aqueous solution as a lump. Then, the water surface is entirely covered with the passage of time, but the ice thickness is relatively thin. Also at this time, the release unit 23
In this case, sherbet-like ice is generated. In FIG. 3B, the thickness of the sherbet-like ice covering the entire surface of the water increases. And since it flows down along the plate body 20 from the release part 23, the generated ice enlarges from the part along the said filter part 22. Finally, the sherbet-like ice generated by the release unit 23 and the ice floating on the water surface are connected and integrated. Also at this time, the water or the aqueous solution existing between the ice particles of the sherbet-like ice circulates freely to the water intake port 3 side through the filter unit 22. In FIG. 3 (C), the generated ice fills most of the heat storage tank 1 below the water surface. Thereafter, newly generated sherbet-like ice accumulates above the generated ice on the water surface. At this time, the water or the aqueous solution separated from the ice is always taken through the filter section 22 while being in contact with the ice below the release section 23, so that the unreleased water (supercooled state) Even if there is, it is released in the water, and it is possible to reliably prevent the ice from returning to the water pipe 4. In FIG. 4D, the position for releasing the supercooling is separated from the releasing section 23 and moves to the upper portion of the accumulated ice. During this time, since new ice is being generated, the release position gradually moves to the nozzle 5 side. In this state, since no device is present on the upper surface of the heat storage tank 1 and there is no member that prevents the filling of ice, the upper surface of the heat storage tank is effectively used as an ice filling space. Become. In the heat storage tank 1, the water or the aqueous solution existing between the ice particles of the sherbet-like ice freely circulates to the water inlet 3 through the filter part 22, so that the water or the water is not used for the water of the pump 6. There is no defect. The applicant has filed an application (Japanese Patent Application No. 7-5625).
As described in No. 7), when 0.8% by weight or less of ethylene glycol or propylene glycol is added to water, the fluidity of the generated ice increases, so that the ice filling effect is further exhibited. It could be confirmed. In particular, since the generated ice moves smoothly in the water even when the generated ice is accumulated on the filter portion 22 of the subcooling canceling body 2, the water surface which is the tank opening from the subcooling canceling body side to the nozzle 5 side is formed. This is useful for allocating the upper space to the ice filling space. The ice making rate was about 60%, and a high ice making rate could be realized. Further, on both sides of the subcooling canceling body 2, an ice filling space and a storage space for only water or an aqueous solution are separated, so that ice larger than at least the diameter of the water intake 3 is not guided to the water intake 3. Filter section 22
Therefore, the flow rate of water circulation by the pump 6 did not decrease even at an ice making rate of about 60%. Even if the fine ice passes through the filter section 22 and is sent by the pump 6, it is heated and melted by the water heater 7 provided on the discharge side. Therefore, it is possible to prevent the fine ice from entering the subcooler 9 and freezing. The opening diameter of the filter section 22 is:
It was confirmed that by setting the thickness to about 0.1 mm, stable supercooled water could be supplied only by the heating action of the water heater 7. And since the filter part 22 is integrally provided with the subcooling cancellation | release body 2, the flow path area of water can be enlarged.
That is, a fine filter that captures fine substances such as ice chips and ice nuclei in the middle of the water pipe 4 can be dispensed with, so that the transport power of the pump 6 can be reduced by that much, and the running cost can be reduced. This is also advantageous for maintenance. FIGS. 4 and 5 show an ice heat storage device according to another embodiment. Except for a supercooling canceling body 2A, which will be described later, the heat storage tank 1, the water intake port 3 and the nozzle 5 provided in the heat storage tank, and the water pipes 4 and the water pipes connecting the water intake ports and the nozzles are provided in the middle part. The configurations of the pump 6, the water heater 7, the strainer 8, and the subcooler 9 are not changed at all.
The configuration of the refrigerator 10 is exactly the same. The supercooling canceling body 2A is composed of a portion 23A on the water surface, which is the side surface portion 1b of the heat storage tank facing the nozzle 5, and a plate body 20A which is almost entirely immersed in water. An opening 21 is opened in this plate body 20A,
This is the same as being covered by the filter unit 22. That is, the release portion 23A is formed in common with the side wall 1b of the heat storage tank 1, and the release portion 23A
And the filter section 22 are formed separately from each other. In this type of ice heat storage device, the supercooled water jetted from the nozzle 5 collides with the heat storage tank side wall 1b, which is the release portion 23A, and the supercooled state is released. Other functions are the same as those described above. In this case, since the heat storage tank side wall 1b is shared as the release portion 23A, the position of the release portion is retracted more than in the above-described embodiment. In other words, the heat storage tank 1
The ice filling space on the surface of the water inside is expanded. Alternatively, the heat storage tank 1 can be made compact by keeping the ice filling space constant. Further, the nozzle 5 is provided with the release portions 23 and 23A.
However, the supercooled water is supplied in a spot-like manner, but the present invention is not limited to this. The supply may be performed by using a nozzle 5A as shown in FIG. FIG. 5A shows the nozzle 5.
FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 1C is a side view. To be more specific, although the water pipe connection side of the nozzle 5A is formed in a circular shape, the distal end edge W is an opening which is flat in the lateral direction. In addition, as shown in FIG.
Furthermore, it is formed in an expanded shape at the leading edge W. Therefore, when this type of nozzle 5A is used, as shown in FIG.
From the tip of the flat. Release unit 23 (23
In (A), the expansion width dimension of the supercooled water is set to the release portion 23 (2
If it is set to be almost the same as the width dimension of 3A),
The generated ice is accumulated in the heat storage tank 1 in a uniform state, and a higher ice making rate is obtained. As described above, in the present invention , since the subcooling release plate and the filter unit are integrated, the ice filling space at the opening of the heat storage tank is expanded. Alternatively, the size of the heat storage tank can be reduced. The filter section completely separates the ice filling space from the water or aqueous solution space, which makes it possible to make the space in the heat storage tank effective and increases the ice making rate. There is no need for a fine filter for repairing ice nuclei in the middle of the water pipe, so that it is possible to reduce the pumping power, which is advantageous for maintenance. [0060]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic configuration diagram of an ice heat storage device and a refrigerator, showing an embodiment of the present invention. FIG. 2 is a diagram illustrating a state in a heat storage tank according to the embodiment. FIGS. 3A to 3D are diagrams for sequentially explaining states of ice formation according to the embodiment; FIGS. FIG. 4 is a schematic configuration diagram of an ice heat storage device and a refrigerator according to another embodiment. FIG. 5 is a diagram illustrating a state in the heat storage tank according to the embodiment. FIG. 6A is a plan view of a nozzle according to still another embodiment. (B) is a front view of the nozzle. (C) is a side view of the nozzle. FIG. 7 is a view for explaining the ejection state of the nozzle according to the embodiment. [Description of Signs] 3 ... Water intake port, 1 ... Heat storage tank, 6 ... Pump, 9 ... Subcooler, 5 ... Nozzle 2 ... Subcooling release body, 23 ... Release section, 22 ... Filter section.

Continuation of the front page (56) References JP-A-6-147561 (JP, A) JP-A-7-190577 (JP, A) JP-A-2-97872 (JP, A) JP-A-6-41063 (JP) , Y2) JP 7-34267 (JP, Y2) JP 6-5535 (JP, Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F24F 5/00 102 F25C 1/00

Claims (1)

(57) [Claims 1] A heat storage tank having an open upper surface for storing water or an aqueous solution and having a water intake section on a bottom wall thereof, and water or an aqueous solution from the water intake section of the heat storage tank. A pump for taking water and sending water, a supercooler for introducing water or an aqueous solution sent from the pump to exchange heat with refrigerant in a refrigeration cycle and to change the supercooled water to a temperature below the freezing point; A nozzle for ejecting supercooled water guided from the nozzle, and a supercooled canceling body for canceling the supercooled state by receiving the supercooled water ejected from the nozzle and supplying the generated ice into the heat storage tank. The supercooling canceling unit receives a supercooling water jetted from the nozzle, cancels the supercooling state, and generates ice,
An ice heat storage device comprising: a water storage section in a heat storage tank; and a filter section configured to conduct only water or an aqueous solution.