JP2811271B2 - Ice making equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ice manufacturing system for storing ice for heat storage, which serves as a cold heat source for air conditioning, ice for scattering, indoor / outdoor ski areas, and ice for general cooling / cooling. The present invention relates to an apparatus for continuously and stably producing ice in a closed system using supercooled water.

[0002]

2. Description of the Related Art Conventionally, a supercooled water obtained by cooling water to 0 ° C. or lower has a flocculent (sherbet-like /
As an apparatus for producing liquid-like ice, for example, Japanese Patent Application Laid-Open No. 3-241251, "Ice storage device for air conditioning" is known. In this device, the supercooled water immediately after exiting the cooling pipe of the cooler is released and dropped into the atmosphere, and collides with a shock plate or the like installed below to change the phase of the supercooled water into ice. It produces and produces ice.

However, the apparatus of this method requires (1) a certain vertical distance between the cooler and the impact plate or the like, which limits the height at which the apparatus is installed. (2) Manufacturing There is a spatial limitation between the ice storage tank and the cooler. (3) Once released to the atmosphere, heat exchange occurs with the atmosphere, and part of the produced ice melts. (4) Oxygen dissolves in the circulating water to release to the atmosphere, causing corrosion of piping and equipment. (5) Ice is generated downward by free fall, so it is difficult to transport the formed ice to a distant place. There is.

[0004]

SUMMARY OF THE INVENTION It is a main object of the present invention to provide a supercooling type ice making apparatus which can be installed even in a place where vertical height is not sufficient. Another object of the present invention is to change the phase of supercooled water into ice in an environment shielded from the atmosphere to prevent deterioration of piping due to dissolution of oxygen. Still another object of the present invention is to provide an ice manufacturing apparatus having a degree of freedom such that ice manufactured in an environment shielded from the atmosphere can be transferred to an arbitrary place by pumping the ice through a pipe connected to the ice manufacturing apparatus. To provide.

[0005]

According to the first aspect of the present invention, there is provided a cooler for cooling water to produce supercooled water, and a supercooled state of generated supercooled water is eliminated. And a supercooling release device for continuously converting the mixture into water and ice by mixing the water and ice flowing inside them into an ice manufacturing device in which the mixture is continuously converted to a mixture of water and ice in a closed system.
The supercooling release device includes a large-diameter pipe and a small-diameter pipe.
The flow rate in the pipe at the inlet side of the supercooled water is 2.7 m / s or more
It is made of small diameter pipe so that the small diameter pipe is inside the large diameter pipe.
And protrude from the nozzle
Supercooled water in the large-diameter pipe downstream of the
A phase change inducing device that induces a phase change from ice to ice
Is achieved by an ice making device .

[0006]

In the present invention, the cooler and the supercooling release device are used to seal the water and ice flowing inside, and to produce ice in a closed system. Since no distance is required, the ice making device can be installed even in an existing building where the vertical distance between the cooler and the ice storage tank is not sufficient or the ice storage tank is located above the cooler. . Further, since ice is produced in a closed system, dissolution of oxygen can be prevented, and deterioration of the piping can be prevented.

[0007] In addition, the supercooled water becomes a mixture of water and ice in the closed system by the supercooling release device and is transported in the pipe. Therefore, the pressure of the water sent to the cooler is reduced to the mixture of water and ice. The mixture of water and ice formed here has a small ratio of ice to water, and thus does not have a risk of blocking the inside of the transport pipe. Therefore, ice formed in a closed system
Since it can be transferred to an arbitrary place through the pipe as it is, there is an advantage that the place where the ice storage tank is installed can be freely selected.

The present invention is characterized in that the supercooling canceling device includes a large-diameter pipe and a small-diameter pipe, and the inlet side of the supercooled water has a small-diameter pipe such that the flow velocity in the pipe is 2.7 m / s or more. The small-diameter pipe is disposed in a large-diameter pipe so as to protrude in a nozzle shape, and a phase change that induces a phase change from supercooled water to ice in the large-diameter pipe downstream of the nozzle-shaped portion. A trigger device is provided.

In this aspect, the phase change from the supercooled water to the mixture of water and ice in the subcooling release device is performed as follows. 1. The flow velocity is greater than the phase change propagation velocity by passing the supercooled water created by the cooler through a small diameter pipe .
Was accelerated up to 7m / s or more, and by rapidly increasing the cross-sectional area of the flow path end of the small diameter pipe protrudes large diameter tube to the nozzle shape, even if there is ice on the large diameter tube water The phase change from ice to ice does not propagate upstream. Once ice nuclei are generated in supercooled water with a slow flow rate by the phase change inducing device, the water corresponding to the degree of supercooling changes into ice, and the supercooled water becomes a mixture of water and ice. Thereafter, the ice becomes an ice nucleus and undergoes a continuous phase change. In order to induce a phase change, the molecular arrangement of supercooled water is changed using methods such as cavitation in water, collision or friction between solids in water, or strong turbulence in water,
Supplies the energy required for a stable ice structure in part. By the above operation, the supercooled water can be continuously changed to a mixture of water and ice.

[0010] In a second aspect of the present invention, in the second aspect of the present invention, the ice producing apparatus is configured to extend from the vicinity of the downstream end of the large-diameter pipe of the subcooling canceling device to the periphery of the portion of the small-diameter pipe that protrudes in a nozzle shape. And a bypass pipe for circulating and flowing water and ice. As a result, the flow of water and ice in the large-diameter pipe flows inside by mixing the main flow to the pipe connected downstream and the bypass flow by the bypass pipe. Accordingly, it is possible to prevent ice from adhering to the vicinity of the tip of the nozzle portion, and it is possible to stably produce ice.
Further, even if the ice formed in the large diameter pipe accumulates, the accumulated ice portion is removed by the bypass flow, mixed with water, and the accumulated ice is removed.

[0011] The ice making device according to the present invention can be further implemented in several aspects. Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

FIG. 1 shows an entire ice making system (primary side) including an ice making device 24 using supercooled water according to a preferred embodiment of the present invention. Water from an ice storage tank 8 is introduced into the cooler 1 by a water circulation pump 9, and the water passing through the inside of the cooler 1 is cooled to a temperature below freezing (supercooling). Refrigerator 2 is used for cooling water, and brine (non-freezing liquid) is supplied to refrigerator 2 by brine circulation pump 3.
Is supplied. The water 10 that has reached supercooling is sent into the subcooling release device 23.

The supercooling canceling device 23 includes a large-diameter pipe 5 and a small-diameter pipe 4, and water that has reached supercooling in the cooler 1 is first sent out into the small-diameter pipe 4, After the flow velocity is increased to 2.7 m / s or more therein, it is blown out from the nozzle-like tip 4A (FIG. 2) of the small-diameter pipe 4 extended into the large-diameter pipe 5. Supercooled water 10 flowing into large diameter pipe 5
Was changed from water to ice 11 by the phase change inducing device 7 for changing the phase of the supercooled water into ice, and flowed downstream in the large-diameter tube 5 to become cotton-like (sherbet-like / liquid-like). The ice 11 and the water are transported into the ice storage tank 8.

In the embodiment of FIG. 1, the phase change inducing device 7
Although installed around the large-diameter tube 5 downstream of the nozzle-shaped tip portion 4A of the small-diameter tube 4, the position of the phase change inducing device 7 can be changed as described later.

In FIG. 1, a bypass pipe 6 is connected from the vicinity of the downstream end of the large-diameter pipe 5 to the periphery of the nozzle-shaped tip 4A of the small-diameter pipe 4.
A bypass flow of water and some ice is formed. The phase change ratio of supercooled water to ice is determined by the temperature of the supercooled water. The temperature of the supercooled water is Tw (° C.), and the latent heat of melting of ice is Q ice (= 79.
6 kcal / kg), (-Tw / Q ice) × 10
0 (%). That is, when the supercooling water temperature is -2 ° C,
(2 / 79.6) × 100 = 2.5% of the supercooled water changes into ice. The phase-changed ice is small ice crystals that float in the water and become cottony (sherbet-like / liquid-like).

The effect of the bypass flow from the downstream of the large diameter pipe 5 is to prevent clogging with ice as shown in FIG. If there is no bypass pipe (FIG. 2A), the small-diameter pipe 4
A vortex is formed near the outlet from the nozzle-shaped tip 4A of
The generated small ice gradually accumulates, and finally the accumulated ice 13
Covers the cross section of the large diameter pipe 5 and eventually causes blockage. When the bypass pipe 6 is provided (FIG. 2B), the nozzle-like tip from the downstream side of the large-diameter pipe 5 due to the pressure difference between the negative pressure around the nozzle-like tip 4A and the pressure of the bypass pipe take-out part downstream of the large-diameter pipe 5. Water and some ice flow in the direction of 4A. Due to this bypass flow, ice generated around the nozzle-shaped tip 4A is prevented from accumulating, and clogging due to accumulated ice in the tube is eliminated.

The bypass pipe 6 is connected to the large-diameter pipe 5 at one or more locations along the circumferential direction of the large-diameter pipe 5 as shown in FIGS. Is connected in such a manner that a bypass flow is formed in the large-diameter pipe 5 in a spiral shape with respect to the supercooled water 10 flowing from the pipe. The spiral water flow prevents the supercooled water 10 from directly contacting the surface of the large-diameter pipe 5, so that the accumulation of ice on the inner surface of the large-diameter pipe 5 can be prevented.

As shown in FIG. 4, the phase change inducing device 7 for changing the phase of the supercooled water 10 is installed on the inner wall of the large-diameter pipe 5 (FIG. 4A). A return pipe 14 for releasing supercooling is provided between the downstream side and the downstream side to forcibly generate a bypass flow by the pump P to induce a phase change (FIG. 4B), or provided in the middle of the bypass pipe 6. There is a method (FIG. 4C), a method of providing a pump P in the middle of the bypass pipe 6 to induce a phase change, and forcibly return the bypass flow (FIG. 4D).

When the phase change start temperature of the supercooled water 10 is low, the pipe itself is cooled to the phase change start temperature, and after the phase change starts, ice adheres to the pipe surface, and the adhered ice The phase-changed ice from the supercooled water adheres to and accumulates in the tube, blocking the pipe. Therefore, in order to generate a phase change of the supercooled water in a closed system, the phase change is performed at a supercooled water temperature as high as possible from 0 ° C. to −0.5 ° C. in order to prevent blockage in the pipe. Must wake up. As a method for satisfying this condition, it is possible to use the cavitation generated by a rotating body (a propeller, a pump impeller, etc.), the cavitation generated by an ultrasonic vibrator, a change in molecular arrangement caused by collision or friction between solids, and the like.

FIG. 5 shows an example of the phase change inducing device 7 as described above. FIG. 5A shows a method in which a rotating shaft 17 is driven by a motor 15 to rotate a propeller 18 at high speed to generate cavitation to perform a phase change.
FIG. 5B shows a method of forcibly bringing the tips of the rotating blades 20 and 22 into contact with the inner surface of the cylinder 19 in the cylinder 19 to generate a phase change by solid contact. The relationship between the cylinder 19 and the rotary blade 20 is shown in the cross-sectional view of FIG. 5D. By providing the opening 25 on the wall surface of the cylinder 19, a collision due to solid contact occurs and the effect is further enhanced. FIG. 5C shows a method of causing the ultrasonic transducer 21 to generate cavitation in water to cause a phase change.

When the phase change inducing device 7 causes a phase change of the supercooled water for the first time, ice generated in the large-diameter pipe 5 is present. The generated ice is constantly supplied to the nozzle-shaped tip portion 4A of the bore tube 4, and this ice triggers the next phase change.
Even if the operation of is stopped, the operation is continuously performed. That is, if the phase change inducing device 7 functions at the time of the first supercooled water phase change,
Note that in the subsequent phase change, the generated ice itself becomes an ice nucleus and the phase change is performed continuously.

[0022]

As described in detail above, according to the present invention, since it is not necessary to allow the supercooled water to fall freely, the ice making apparatus can be installed even in a place where the height in the vertical direction cannot be sufficiently obtained. Becomes possible. Further, since the supercooled water is changed into ice in an environment shielded from the atmosphere, deterioration of the pipe due to dissolution of oxygen can be prevented. Further, the technical effect of the produced ice is extremely remarkable, for example, it can be transported to an arbitrary place by pumping the produced ice through a pipe.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an entire ice making system including an ice making device according to the present invention.

FIG. 2 is a partial cross-sectional view showing a flow of ice at a connection portion between a large diameter pipe and a small diameter pipe.

FIG. 3 is a partial cross-sectional view illustrating a connection structure between a large diameter pipe and a bypass pipe.

FIG. 4 is a schematic diagram showing a position of a phase change inducing device in a subcooling release device.

FIG. 5 is a schematic sectional view showing the structure of a phase change inducing device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooler 2 Refrigerator 3, 9 Pump 4 Small diameter pipe 4A Nozzle-like tip part 5 Large diameter pipe 6 Bypass pipe 7 Phase change inducing device 8 Ice storage tank 10 Supercooled water 11 Ice 13 Deposited ice 23 Supercool release device 24 Ice Manufacturing equipment

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25C 1/00 F24F 5/00

Claims (7)

(57) [Claims] A cooler for cooling water to produce supercooled water;
A supercooling release device that eliminates the supercooled state of the generated supercooled water and continuously converts the supercooled water into a mixture of water and ice is provided in a system in which the water and ice flowing inside them are sealed and the water and ice are mixed. In an ice making device that is continuously converted into a mixture , the supercooling release device includes a large-diameter tube and a small-diameter tube, and
The flow velocity in the pipe at the inlet side of the water is 2.7m / s or more
The small diameter pipe is made of a small diameter pipe, and the small diameter pipe is
The nozzle-shaped part
Downstream from the supercooled water to ice
A phase change inducing device for inducing a phase change shall be provided.
And an ice producing apparatus . 2. A bypass pipe for circulating and flowing water and ice from near the downstream end of the large-diameter pipe to around the nozzle-shaped portion of the small-diameter pipe is connected.
The ice manufacturing device according to claim 1 . 3. The ice making apparatus according to claim 2, wherein the bypass pipe is connected along a circumferential direction of the large diameter pipe so as to generate a spiral flow along a wall surface of the bypass pipe. . 4. A cooler for cooling water to produce supercooled water,
Eliminate the supercooled state of the generated supercooled water
A supercooling release device for continuously converting the mixture
Mixed water and ice in a closed system with water and ice flowing inside them.
In an ice making device that is continuously converted into a compound, the supercooling release device includes a large-diameter pipe and a small-diameter pipe,
The inlet side of the recirculating water is made of a small-diameter pipe so that the flow velocity in the pipe becomes 2.7 m / s or more, and the small-diameter pipe is arranged so as to protrude into a large-diameter pipe in a nozzle shape. A bypass pipe for circulating and flowing water and ice is connected from the vicinity of the downstream end to the area around the nozzle of the small-diameter pipe, and a phase change from supercooled water to ice is connected to the bypass pipe. Japanese to induce a phase change induced device is provided
Ice manufacturing apparatus for the butterflies. 5. The claims wherein the phase change induced device adapted to induce a phase change by collision or friction between the solid
5. The ice producing apparatus according to 1 or 4 . 6. A return pipe for circulating water and ice from a downstream side to an upstream side of the supercooling release device is provided, and a phase change is induced by a pump provided in the middle of the return pipe. The ice making device according to claim 1, wherein 7. The method of claim 4 adapted to induce a phase change by a pump provided in the middle of the bypass tube
An ice manufacturing apparatus as described in the above.