JP2023062634A - Ice making device and modification method of the same - Google Patents

Abstract

To provide an ice making device which prevents freezing of water remaining at a spray part which sprays water toward an ice making surface to enable smooth ice making even in an intermittent operation.SOLUTION: An ice making device makes ice on an ice making surface and has a spray part which sprays water to the ice making surface. The spray part has spray nozzles 156 each of which inclines downward and has a tip part 154 including an outflow opening and facing the ice making surface. The tip part 154 of the spray nozzle 156 is cut so as to incline obliquely relative to an extending direction of the spray nozzle 156.SELECTED DRAWING: Figure 4

Description

TECHNICAL FIELD The present invention relates to an ice-making device and a repair method for the ice-making device, and more particularly, by preventing freezing of the water remaining in the sprinkling part that sprays water toward the ice-making surface, even in intermittent operation, Ice-making equipment that enables smooth ice-making, and in existing ice-making equipment, by preventing freezing of water remaining in the sprinkling part that sprinkles water toward the ice-making surface, smooth ice-making is possible even in intermittent operation. The present invention relates to a method of repairing an ice-making device that enables ice-making.

Traditionally, reaming ice making methods have been used to make ice.
A reamer-type ice-making device includes a substantially cylindrical ice-making cylinder having an ice-making surface on its inner or outer peripheral surface, and a water sprinkling section for supplying ice-forming water to the inner or outer peripheral surface of the ice-making cylinder. , a reservoir disposed below the ice-making cylinder to receive and store water that has flowed down without freezing in the ice-making cylinder; a reamer, the reamer having a plurality of blades for breaking ice with blade edges spirally arranged around a substantially cylindrical rotary shaft; A thin layer of ice formed on the ice-making surface can be peeled off by rotation about the rotation axis.
The water spraying section has a water spraying nozzle that slopes downward toward the ice making surface, which is the inner or outer peripheral surface of the ice making cylinder, for spraying water. A cross section in a direction substantially perpendicular to the direction is formed in a circular shape, for example, if the water nozzle is a hose with a circular cross section.

The method of using such a reamer type ice making device is determined by the temperature of the feed water used to form ice by freezing, the evaporation temperature of the refrigerant used to freeze the feed water, and the inner circumference of the annularly formed ice layer. In this method, flaky ice pieces are made by adjusting the number of rotations of a reamer that separates flaky ice pieces by biting a rotatable blade concentrically with the ice layer into the surface.
Ice pieces, which are ice-made flaky ice pieces, have been used, for example, by being crushed using an ice crusher into ice particles having a predetermined particle size.
For example, conventionally, an environmental test room has been used in which a complete model vehicle is placed indoors, various natural environments and weather conditions are set, and the load on the vehicle is collected as data and analyzed.
As an example, artificial snow is used to simulate a snowstorm in an environmental test room, and the snowstorm is blown toward the vehicle to deal with problems caused by snow entering the engine room and icing problems such as freezing of suspension parts. is being done.

To this end, the environmental test chamber has a wind tunnel in which the vehicle is located and of sufficient space to blow a snowstorm toward the vehicle, and a snowstorm generator.
The blizzard generating device is simulated by an ice maker that produces flaky ice pieces, an ice crusher that crushes the produced flaky ice pieces into ice particles of a predetermined particle size, and crushed ice particles of a predetermined particle size. It has a pipe for conveying the artificial snow into the wind tunnel, and a blowout nozzle installed at the tip of the pipe and blowing out toward the front of the vehicle.
According to such an environmental test chamber, it is possible to conduct an environmental test simulating the natural environment and weather conditions by blowing a snowstorm toward the vehicle in the wind tunnel using the snowstorm generator.

At this time, in order to conduct an appropriate and effective environmental test, it is necessary to simulate a snowstorm in a natural state. Furthermore, it is important to secure the amount of snow necessary for the test, and to prevent the quality of the artificial snow produced based on the ice pieces made by the ice maker from changing, the ice making by the ice maker is , it is required to make the necessary amount of ice on the spot when conducting the test.
In the conventional ice-making machine, the following technical problems are caused by the repetition of ice-making and stoppage of ice-making by the ice-making machine, that is, intermittent operation.

That is, in the environmental test, ice making by the ice maker is required to make the necessary amount of ice on the spot when the test is conducted. When the spraying of water from the water nozzle to the ice-making surface is stopped, the surface tension of the water tends to cause water to accumulate at the tip of the nozzle that forms the outflow opening. If water remains and the tip of the water nozzle is below the freezing point, the remaining water freezes and clogs the water nozzle, making it difficult to start ice making smoothly when restarting the operation.
In this case, even if ice making by the ice-making machine is stopped, it is possible to continue sprinkling water from the sprinkling nozzle onto the ice-making surface and return the water falling from the ice-making surface to the side of the sprinkling nozzle for circulation. Equipment is required, resulting in an increase in cost.
It should be noted that such technical problems are not limited to the reaming ice making method by physical peeling, but rather the cooling of the water supply from the water spray nozzle with a refrigerant to form a thin ice layer on the ice making surface. , is a common problem insofar as it de-ices it from the ice-making surface and produces ice chips.

SUMMARY OF THE INVENTION In view of the above technical problems, an object of the present invention is to prevent freezing of the water remaining in the water sprinkling section that sprays water toward the ice making surface, thereby enabling smooth ice making even in intermittent operation. To provide an ice making device capable of
SUMMARY OF THE INVENTION In view of the above technical problems, an object of the present invention is to prevent freezing of the water remaining in the water sprinkling section that sprays water toward the ice making surface in an existing ice making apparatus, thereby preventing intermittent operation. Another object of the present invention is to provide a method for repairing an ice-making device that enables smooth ice-making.

In order to achieve the above object, the ice making device of the present invention includes:
In an ice-making device that makes ice on an ice-making surface,
Having a water spraying part for spraying water toward the ice making surface,
the water spray unit has a water spray nozzle inclined downward and having a tip portion including an outflow opening facing the ice making surface;
The tip of the water nozzle is cut obliquely with respect to the extending direction of the water nozzle.

According to the ice-making apparatus having the above configuration, a thin layer of ice is formed on the ice-making surface by sprinkling water onto the ice-making surface whose temperature is controlled, and the thin layer of ice is peeled off from the ice-making surface to form flakes or When plate-shaped ice is made, water is sprayed onto the ice-making surface by water spray nozzles that are inclined downward toward the ice-making surface.
For example, in an environmental test using artificial snow, when artificial snow is supplied to the test object under various conditions, the ice making device must be operated intermittently to make ice. Ice is made by freezing on the ice-making surface, and the ice that is made is used to supply artificial snow to the test object, and the ice that is made is used to supply artificial snow to the test object. During the time interval until the water is supplied again, the remaining water in the sprinkler unit freezes, and in some cases the sprinkler unit is blocked. The tip of the water nozzle, which includes the outflow opening, faces the ice-making surface. By reducing the adhesive force of water that tends to accumulate due to the surface tension of the water, the amount of residual water is reduced, and the residual water in the sprinkler section is suppressed, thereby preventing such a situation and smooth ice making. It becomes possible.

Moreover, it is preferable that the tip portion of the water nozzle is inclined downward in the extending direction of the water nozzle.
Further, the outflow opening at the tip of the watering nozzle is preferably elliptical with a major axis directed downward.
Furthermore, it is preferable that the inclination angle is not less than 20 degrees and not more than 30 degrees.

Further, the ice-making surface is an inner or outer peripheral surface of a cylindrical body, and the water sprinkling portion is an annular body concentric with the cylindrical body. It is preferable that a plurality of water spray nozzles are provided so as to extend radially outward at predetermined angular intervals.
Further, in the ice making device, it is preferable that the method for separating the thin ice layer formed on the ice making surface from the ice making surface is a blade type.
Furthermore, the ice-making apparatus may be of a reamer type for separating the thin ice layer formed on the ice-making surface from the ice-making surface.
In addition, the material of the inner surface of the water nozzle is preferably selected so as to exhibit desired water repellency or hydrophilicity according to the inner diameter of the water nozzle pipe, the nozzle inclination angle, and the inner surface roughness.

In order to achieve the above object, the method for refurbishing an ice-making device of the present invention includes:
An ice making device that makes ice on an ice making surface,
Having a water spraying part for spraying water toward the ice making surface,
In the ice making device, wherein the water spray part has a water spray nozzle that slopes downward and has a tip part including an outflow opening that faces the ice making surface,
The tip of the water nozzle is cut obliquely with respect to the extending direction of the water nozzle.
A method for repairing an ice-making device, characterized by:

Moreover, it is preferable that the tip portion of the water nozzle is slanted downward in the extending direction of the water nozzle.
Furthermore, the inclination angle is preferably 20 degrees or more and 30 degrees or less.

A first embodiment of the reaming ice making method of the present invention will be described in detail below with reference to the drawings, taking as an example the case where ice made is used for an environmental test.
First, the snow environment test system will be described. As shown in FIG. 1, the snow environment test system 10 uses artificial snow made of ice particles and puts the artificial snow on an air current from behind to simulate a snowstorm. , and is configured to blow toward a vehicle V, which is a test specimen, and has a blizzard supply system 12 and an airflow supply system 14 for that purpose.
In particular, when using a required amount of snowstorm with a predetermined snow quality in which ice grain size and moisture content are the main influencing factors, and blowing continuously toward the vehicle V, the entire height of the vehicle V Immediately before the test, a group of ice grains to be used as artificial snow is manufactured under prescribed temperature and humidity control in order to diffuse and possibly achieve the desired snowstorm concentration distribution in the height direction of the vehicle V. It is required to supply it promptly.

More specifically, the snow environment test system 10 includes a wind tunnel 16 in which a vehicle V to be tested is placed, a cold room 18 placed above the wind tunnel 16, and an ice making room placed above the cold room 18. 20, in which an ice-making device 22 is arranged, and in a cold room 18, an ice temperature stabilization conveyor 24, an ice crusher 26, a blower 28, a cooler 30, and a distribution of artificial snow. A device 34 is arranged, and in the wind tunnel 16, a wet snow device 32, an artificial snow blowing nozzle 36, and a snowstorm collecting device 38 are arranged. Artificial snow is produced by crushing ice in a chamber 18 and turning it into ice particles, and the artificial snow is pressure-fed toward a wind tunnel 16. In the wind tunnel 16, the wet snow artificial snow is distributed and converted into a low-temperature air current. It is configured to be placed on and turn into a blizzard and blow toward the vehicle V.

The wind tunnel 16 is an open-type circulation type, and includes an (open-type) measurement chamber 300 in which a vehicle to be measured is installed, and four first to fourth bending tunnels 302, 304, 306, and 308 (bending portions). and is formed in a substantially rectangular shape in plan view. The airflow generated by the blower 25 passes through the second diffusion cavity 310, the third curved cavity 306, the fourth curved cavity 308, the rectification cavity 312 (see FIG. 1), the contraction cavity 314 (see FIG. 1), and the measurement chamber 300. It flows into the measurement chamber 300 from the outlet 316 (see FIG. 1) that opens to the outside, and flows through the first bending cavity 302 and the second bending cavity 304 in this order.
The airflow blown by the blower 25 once decreases the wind speed (dynamic pressure) of the entire airflow to increase the pressure (static pressure) in the intermediate cavity, and then passes through the contraction cavity 314 to measure. The necessary and sufficient amount (air velocity) of airflow can be blown out from the outlet 316 to the measurement chamber 300 for the measurement.

As a result, as will be described later, the ice particles that have been air-conveyed through the ice-making process, ice-breaking process, separation process, and wet-snow process are carried in the measurement chamber 300 by air currents from behind them, and are blown toward the vehicle. By adjusting the wind speed of the airflow with the blower 25, the stationary vehicle can simulate a moving vehicle.
In the case of the circulating wind tunnel 16 for the snowstorm test, a separate snow repair device 38 is provided downstream of the vehicle V in order to separate and collect the snow after the test. In order to separate the snow by the inertia effect, an area is provided downstream of the vehicle V where the airflow is not rectified.

The snow blowing supply system 12 is provided with three systems, each of which includes a snow supply pipe 40 that connects the ice crusher 26 and the blowout nozzle 36, and an air duct 44 that connects the suction port 42 in the wind tunnel 16 and the ice crusher 26. is provided, and in the snow supply pipe 40, the artificial snow distribution device 34 and the wet snow device 32 are connected in this order between the ice crusher 26 and the blowing nozzle 36, while the air duct 44 is connected in the wind tunnel 16 A blower 28 and a cooler 30 are connected between the suction port 42 and the ice crusher 26 .
The reason why the artificial snow distribution device 34 is installed on the upstream side of the wet snow device 32 is that if the artificial snow distribution device 34 is installed on the downstream side, the wet snow is sent to the distribution device 34 and the inside of the distribution device 34 to prevent clogging.

In each system, the reamer type ice making device 22 is a so-called reamer type ice making device 22 that produces flaky ice pieces. is selected from a plurality of reaming ice-making devices 22 that produce ice, and ice is made by the selected reaming ice-making device 22 according to changes in the required amount of artificial snow used in the environmental test. In addition to roughly adjusting the ice making amount per unit, the selected reamer type is selected according to the difference between the required amount of artificial snow and the coarsely adjusted ice making amount per unit time in response to changes in the required amount of artificial snow used in the environmental test. Each ice making device 22 has a control device (not shown) that finely adjusts the amount of ice made per unit time by adjusting the evaporation temperature and/or the water temperature and/or the number of rotations of the reamer. Preferably, the control device has, as a database, for example, a table of the required number of ice machines with respect to the total required amount of artificial snow used in the environmental test and a change table of the required amount of artificial snow used in the environmental test.
In the reamer type ice making device 22, if ice is made in advance before the test and crushed into ice grains and stored as in the conventional method, the quality of the ice will change with the passage of time, making it difficult to conduct an accurate test. On the other hand, even if the reamer-type ice making device 22 is used to make flaky ice chips by reaming, the flaky ice chips will stick to each other and stick together. Since it is troublesome to separate the stuck ice pieces, it is necessary that the ice-making preparations are completed at the time of the test and that the ice-making function is capable of making ice rapidly and continuously during the test. .

Therefore, when cooling the circulating water, which is the material of the ice, with a refrigerant, tap water is usually used. A break-in operation was carried out so that the temperature of the water was stabilized from 0°C to several°C, and when the test was started, ice could be made continuously while adjusting the peeling cycle by adjusting the number of rotations of the reamer. ing.
The temperature of water, which is the material of ice, can be adjusted by a conventionally known method.

More specifically, as shown in FIG. 2, the reamer-type ice making device 22 is of a conventionally known type. A water sprinkling part 104 for sprinkling water toward the inner peripheral surface to form ice, and a water sprinkling part 104 arranged below the ice making cylinder 102 to receive and store the water that flows down without freezing in the ice making cylinder 102. - 特許庁and a reamer 108 that moves along the inner peripheral surface of the ice making cylinder 102 to break the ice.

The ice-making cylinder 102 is a double-structured, substantially cylindrical body 158 having an inner wall with excellent heat transfer properties and an outer wall that is insulated from the outside. An ice-making surface 150 is an inner peripheral surface of an inner wall that is incorporated and cooled by the action of a refrigerant. In the ice making cylinder 102, the water sprayed adheres to the cooled inner peripheral surface and freezes, so that thin ice having a thickness of about 2 mm, for example, can be produced.

Refrigerant introduced into refrigerant flow path 110 of ice making cylinder 102 is a known medium used in a general refrigeration cycle, and detailed description thereof will be omitted. The evaporation temperature of the refrigerant can be adjusted by a conventionally known method such as an evaporation pressure control valve (not shown).

The reamer 108 is formed by integrally attaching a plurality of blades 112 for breaking ice with blade edges spirally arranged around a substantially cylindrical rotating shaft 171 extending in the vertical direction. It is rotatably supported by the support section. The minimum distance between the blade 112 of the reamer 108 and the inner peripheral surface of the ice making cylinder 102 can be set to, for example, about 0.4 to 0.5 mm, which is smaller than the thickness of the ice. In this way, the reamer 108 revolves around the center line of the ice making cylinder 102 and rotates around the central axis 111 to separate the thin ice layer L formed on the ice making surface 150 . The rotation speed of the reamer 108 caused by the revolution about the revolution axis 115 by the drive motor 173 constitutes the flaky ice chip peeling cycle by the reamer. there is

The blade shape of each blade 112 of this reamer 108 is a simple straight blade shape along a spiral curve. , the size of the ice can be varied from granular to clumpy.

The water sprinkling unit 104 is arranged above the ice making cylinder 102 and comprises an annular body 162 arranged concentrically with the rotating shaft 171 , a water storage tank 168 arranged outside, and the water storage tank 168 and the annular body 162 . It is roughly composed of a water supply pipe 170 that communicates and a water recovery pipe that communicates between the space below the ice making cylinder 102 and the water storage tank 168 (located behind the water storage tank 168 in FIG. 2). Water, which is a material for making ice, is circulated between the annular body 162 and the water storage tank 168 via the pipe 170 and the water recovery pipe. A liquid feed pump 169 is provided in the water supply pipe 170 or the water recovery pipe to circulate water.
The annular body 162 has a hollow portion 163 through which the rotating shaft 171 passes, and is connected to the rotating shaft 171 so as to be rotatable about the axis of the rotating shaft 171 as the rotating shaft 171 rotates. , an inner space 165 filled with water is formed inside the annular body 162 .
As shown in FIG. 3, a plurality of watering nozzles 156 (11 nozzles in the drawing) extend radially outward on the outer peripheral surface 160 of the annular body 162 at predetermined angular intervals in the circumferential direction. is provided as follows.
More specifically, a plurality of circular openings are provided at predetermined angular intervals in the circumferential direction of the outer peripheral surface 160 , and the ends of the tubular water spray nozzles 156 are inserted into the respective circular openings so that the inside of the annular body 162 , and a plurality of sprinkler nozzles 156 are communicatively connected. The water nozzle 156 may be fixed to the outer peripheral surface 160 by welding, for example, if the annular body 162 and the water nozzle 156 are made of metal.
As shown in FIG. 4, the ice making cylinder 102 is provided so as to be inclined downward toward the ice making surface 150 , which is the inner peripheral surface of the ice making cylinder 102 . Through each of them, water is sprayed toward the ice making surface 150 which is the inner peripheral surface of the ice making cylinder 102 and flows down the ice making surface 150 . It is preferable to set the inclination angle α in consideration of the spread range of the water sprayed toward the ice making surface 150 from each of the plurality of watering nozzles 156 on the ice making surface 150 .

A tip portion 154 of the water nozzle 156 is cut so as to be inclined with respect to the extending direction of the water nozzle 156 . In particular, it is preferable that the tip portion 154 of the water nozzle 156 is inclined downward in the extending direction of the water nozzle 156 .
As shown in FIG. 5, the outlet opening 152 at the tip 154 of the circular cross-section watering nozzle 156 is elliptical with the long axis l1 pointing downward.
The inclination angle Θ is preferably 20 degrees or more and 30 degrees or less. If the angle is less than 20°, water may fall from the nozzles and the frozen surface may not be sprayed evenly during ice making. Furthermore, if the opening is too large, the force of the water will weaken and the spread on the frozen surface will become smaller. If ice cannot be made efficiently and the temperature exceeds 30°, the possibility of residual water will increase. It should be noted that the inner peripheral surface of the tip 154 of the water nozzle 156 may be coated with a water-repellent coating, so that the inclination angle Θ can be set to 30° or more.
While the rotating shaft 171 rotates once, that is, while the reamer blade 112 and the annular body 162 revolve, a thin ice layer L is formed by water sprayed from the plurality of water spray nozzles 156, and the formed thin ice layer L is formed by the reamer. The blade 112 is configured to be separated as flake ice by the rotation of the blade 112, and water is continuously sprayed from the plurality of water spray nozzles 156 while the rotating shaft 171 is rotationally driven.

According to the above configuration, when the rotating shaft 171 is driven to rotate by the motor, the reamer blade 112 rotates and revolves around the central axis of the rotating shaft 171, and the ice making cylinder 102 also rotates along the rotating shaft. A thin ice layer is formed on the ice making surface 150 by spraying water from each of the plurality of watering nozzles 156 toward the ice making surface 150 while revolving around the central axis of the ice making surface 171 and flowing down the entire ice making surface 150 . Ice flakes L are separated from the ice-making surface 150 by the reamer blade 112 and fall downward so that they can be collected.

The downward inclination angle α of the plurality of watering nozzles 156 does not necessarily have to be uniform. The angle of inclination may be different as long as it is possible.
The clearance d (FIG. 4) between the lowermost projecting portion of the tips 154 of the plurality of watering nozzles 156 and the ice making surface 150 must be set at least so as not to directly contact the ice making surface 150, especially the ice making surface. The thickness of the thin ice layer L formed on the ice making surface 150 is assumed and set, and a clearance may be secured between the upper surface of the thin ice layer L formed on the ice making surface 150 .
In order to prevent the water remaining at the tips 154 of the plurality of water nozzles 156 from freezing while the ice making device is stopped, the tips 154 of the plurality of water nozzles 156 are cut obliquely. While the rotational drive is stopped, the circulation of water between the annular body 162 and the water storage tank 168 may be continued, so that even if there is residual water at the tip 154 of the water spray nozzle 156, it will be frozen. can be prevented more reliably.
When ice is made by the ice making device 22, all of the plurality of watering nozzles 156 are used to sprinkle water toward the ice making surface 150. However, the present invention is not limited to this, and from the viewpoint of improving the quality of ice to be made, A dry thin ice layer L may be formed by thinning out the ice layer by covering it with a lid or the like.

Although each of the plurality of water spray nozzles 156 has been described as having a straight tubular shape with a constant diameter, it is not limited to this, and as long as a constant flow rate of water can be sprayed toward the ice making surface 150, the spray nozzles 156 can be It may also be a tapered tube with a reduced diameter or an expanded diameter.
As shown in FIG. 3, the number of water spray nozzles 156 provided on the outer peripheral surface 160 of the annular body 162 is eleven. The angular intervals between the nozzles 156 are equal angular intervals.
The number of water spray nozzles 156 provided on the outer peripheral surface 160 of the annular body 162 , that is, the angular interval between the water nozzles 156 adjacent in the circumferential direction is determined by the water spray nozzles 156 that allow water to flow down over the entire ice making surface 150 . By doing so, as long as the thin ice layer L is formed over the entire ice making surface 150, it may be set appropriately, and the angular intervals between the water nozzles 156 adjacent in the circumferential direction need not be uniform.

The flow rate of water sprayed from the plurality of water nozzles 156 is determined appropriately as long as the thin ice layer L is formed over the entire ice making surface 150 by the water flowing down the entire ice making surface 150 from the plurality of water nozzles 156. The number of water nozzles 156 provided on the outer peripheral surface 160 of the ring-shaped body 162 of the plurality of water nozzles 156, that is, the angular interval between the water nozzles 156 adjacent in the circumferential direction, allows one water nozzle 156 to reach the ice making surface 150. The angular range in the circumferential direction of the ice making surface 150 that is covered by the water sprayed down should be taken into account when setting.

In the present embodiment, as the new ice making device 22, the tip portion 154 of the water nozzle 156 is cut obliquely with respect to the extending direction of the water nozzle 156. However, the present invention is not limited to this. Alternatively, the tip 154 of the water nozzle 156 may be modified in the existing ice making device 22 and cut so as to be inclined with respect to the extending direction of the water nozzle 156. 154 is preferably inclined downward toward the extending direction of watering nozzle 156, and the angle of inclination is preferably 20 degrees or more and 30 degrees or less.

As a result, before the modification, the remaining water in the water spraying unit 104 freezes during the time interval until the ice that has been made is used to re-supply to the test object as artificial snow. 104 is blocked, and when the next time ice is made, watering itself may become impossible or difficult. Since the water nozzle 156 is provided and the tip 154 of the water nozzle 156 is cut so as to be inclined with respect to the extending direction of the water nozzle 156, the surface tension of the water causes water to pool. , thereby reducing the amount of residual water and suppressing the residual water in the sprinkler section 104, thereby preventing such a situation and enabling smooth ice making.
The material of the inner surface of the water nozzle 156 is selected according to the inner diameter of the water nozzle 156 pipe, the nozzle inclination angle, and the inner surface roughness so as to exhibit desired water repellency or hydrophilicity. If the water repellency is increased, a state in which it is difficult for water to remain in the water nozzle 156 is formed. It is possible to suppress freezing in a state in which the remaining water in the nozzle forms a bridge as if the remaining water is covered in a circular shape.
Whether to increase the water repellency or increase the hydrophilicity may be selected according to the inner surface roughness of a smooth tube, grooved, dimple uneven structure, or the like.
For example, if water repellency is to be enhanced, fluorine-based materials may be used, and if hydrophilicity is to be enhanced, plasma-treated metals, resins, and coatings may be used.

Regarding the ice-making action of the reamer-type ice-making device 22, the inner peripheral surface of the ice-making cylinder 102 is sufficiently cooled to the extent that the water freezes by supplying the refrigerant to the refrigerant flow path 110 in advance even in a situation where no ice is required. At the same time, a cylindrical thin ice layer L is formed on the ice making surface 150 by sprinkling water onto the ice making surface 150 from the water sprinkling unit 104 . More specifically, ice-making preparations are completed at the time of the test, and ice can be made rapidly and continuously during the test. When ice becomes necessary, the movable part is rotated and water is introduced from the outside into the sprinkler part 104 at the top. The water flows down along the inner peripheral surface of the ice making cylinder 102 through each hole of the sprinkler portion 104 . Most of the water in contact with the cooled inner peripheral surface of the ice making cylinder 102 freezes and adheres to the inner peripheral surface as ice. On the other hand, the remaining unfrozen water flows down to reach the lower end of the ice making cylinder 102 and reaches the reservoir 106 . The water temporarily stored in the storage section 106 is returned to the sprinkler section 104 via a pump, piping, or the like.

As described above, in the reamer type ice making device 22 according to the present embodiment, the ice making cylinder 102 is cooled and supplied with water to produce ice on the inner peripheral surface of the ice making cylinder 102. A reamer 108 is provided to break the ice on the inner peripheral surface with the reamer 108 and peel it off from the inner peripheral surface, thereby making ice without bringing the reamer 108 for breaking and peeling off the ice out of contact with the inner peripheral surface of the ice making cylinder 102.例文帳に追加is possible.

Next, the ice temperature stabilization conveyor 24 forcibly ventilates the ice flakes conveyed on the conveyor with an air current to increase the amount of heat exchange between the ice flakes and the air, thereby increasing the amount of heat exchange between the ice flakes and the air. An attempt is made to maintain the temperature of the strip close to the forced draft ambient air temperature.

The ice crusher 26 mainly consists of an upper rotary feeder (not shown) and a lower pair of ice crushing drums (not shown) fed by the ice temperature stabilization conveyor 24. Ice pieces are quantified by a rotary feeder and supplied to a pair of ice crushing drums, and then crushed by the pair of ice crushing drums and supplied to a snow supply pipe 40 as ice particles of a predetermined grain size.

The snow-making distribution device 34 is used to distribute the snow-making carried by the snow supply pipe 40 to a plurality of branch pipes (not shown), more specifically, the blow nozzles 36 at the same level are connected to the vehicle. The snow supply pipes 40 in each system are branched into a plurality of branch pipes in the width direction of the vehicle V so as to be provided in a plurality in the width direction of the vehicle V, and a wet snow device 32 is provided for each branch pipe. A blowout nozzle 36 is provided at a tip portion 154 of the.

The artificial snow distribution device 34 includes a rotating body (not shown) having an upstream end face and a downstream end face parallel to the downstream end face of the snow supply pipe 40 and the upstream end faces of the plurality of branch pipes, respectively; It has a rotation drive section (not shown) that rotates the rotating body at a predetermined rotational speed about its axial direction. ), and the pumping channel has an intake (see FIG. (not shown), and an outlet (not shown) disposed on the downstream end surface in a non-contact manner so as to closely face the inflow openings (not shown) provided on the upstream end surface of each of the plurality of branch pipes. and the discharge port is provided such that the inflow opening of each of the plurality of branch pipes is positioned on the passage trajectory of the discharge port caused by the rotation of the rotating body.

The wet snow device 32 has a hot air supply pipe (not shown) communicating with the snow supply pipe 40, and the hot air supply pipe extends at its downstream end over a predetermined length in the direction in which the snow supply pipe 40 extends. The outer peripheral surface 164 of the snow supply pipe 40 covered by the annular space has a hot air inlet (not shown) forming an annular space covering the entire outer peripheral surface 164 of the snow supply pipe 40 . (not shown) are provided evenly, thereby forming an aging space (heat exchange ripening area) in the snow supply pipe 40 downstream of the portion of the snow supply pipe 40 to which the hot air inlet is attached, It is made to be wet snow there.

Regarding the airflow supply system 14, the wind tunnel 16 is formed in a part of the circulation space, and is configured to blow a snowstorm over the height of the vehicle V in one direction from the front to the rear of the vehicle V. Specifically, the blower 25 installed in the circulation space generates an airflow with a predetermined wind speed in one direction from the front to the rear of the vehicle V. After passing through the vehicle V, the airflow is cooled to a predetermined temperature by the cooler 27. After being cooled, it is returned to the blower 25 to generate an air flow again, and this is repeated.

Regarding the snowstorm generating device, three snowstorm blowout nozzles 36 are arranged at a predetermined distance in front of the vehicle V at predetermined intervals in the height direction over the height of the vehicle V. , the density of the supplied snowstorm can be adjusted for each of the blowing nozzles 36 . A snow collecting device 38 is arranged at a predetermined distance behind the vehicle V, and the blowing snow that has passed through the snow collecting device 38 passes through a suction port 42 in the wind tunnel 16 to a blower arranged in the low-temperature chamber 18 . 28, cooled by the cooler 30, returned to the ice crusher 26, made by the reamer type ice making device 22, mixed with ice grains supplied to the ice crusher 26 by the ice temperature stabilization conveyor 24, and crushed again. It is adapted to be used to blow snow from the blow nozzle 36 through the snow supply pipe 40. - 特許庁The blowing nozzles 36 are arranged along the traveling direction of the airflow, and the blowout port 102 is installed within the band of the airflow blown out from the blower 25 .
In this regard, the blowing snow is blown out from each blowing nozzle 36 by the air blown by the blower 28, and is blown toward the vehicle V by the air current blown from the blower 25. As long as the pipe 40 is not clogged with snow, the speed is preferably as low as possible.
More specifically, when the blizzard is spread by the spreading plate 74 (described later) and blown toward the vehicle V, the high speed of the pumping air increases the speed of the blizzard only at the blow nozzle 36 . , while deviating from a natural snowstorm, by varying the speed of the airflow blown out of the blower 25, it is possible to uniformly vary the speed of the entire spread snowstorm, particularly by the stationary vehicle V, the moving vehicle , it is advantageous to vary the velocity of the airflow blown from the blower 25 .

As shown in FIG. 1 , a diffusion plate 74 is provided in front of each blowout nozzle 36 . The three snow blowing nozzles 36 cooperate with each other to distribute the snow blowing in the front part of the vehicle V in the height direction of the vehicle V. As shown in FIG.
In this regard, since the wind tunnel 16 is not a so-called aerodynamic wind tunnel 16 but a simple wind tunnel 16, the distance between the blowout nozzle 36 and the front of the vehicle V is about 1 to 3 meters. The snow blowing from the blowing nozzle 36 spreads over the entire height at the front of the vehicle V for a short distance.
A plurality of blowout ports 102 are provided at intervals in the height direction so as to cover the entire height of the vehicle V, and the amount of snow blown out from each blowout port 102 can be adjusted independently of each other. , the density distribution of the snowstorm can be adjusted according to the height of the vehicle V.

A facing surface 104 is provided on the side of the diffusion plate 74 facing the blowout port 102, and the facing surface 104 is arranged at a predetermined position outside the blowout port 102 and in front of the direction in which the airflow advances. Snow blowing out from the mouth 102 and riding on the air current and generated along the air current traveling direction hits the facing surface 104 and is deflected to spread outward on the four sides of the facing surface 104.例文帳に追加
The blizzard is blown toward a stationary vehicle placed in a wind tunnel and used to conduct environmental tests on the stationary vehicle, the distance D2 between the outlet 102 and the vehicle V being 1 to 3 meters, When the snowstorm reaches the vehicle V, the space density distribution of the snowstorm is substantially uniform. size is determined.

In particular, three systems of blowing nozzles 36 are arranged at predetermined intervals in the height direction, and for example, for each distributed wet snow, by adjusting the amount of snow blowing toward the specimen per unit time, By setting the density of the blowing snowstorm to be higher for lower nozzles, when a snowstorm occurs when a vehicle in front passes over snow piled up on the road, the height direction of the vehicle is increased. The concentration distribution of snowstorms is higher the closer to the road, so this situation can be simulated. can be simulated.

The operation of the snow environment test system having the above configuration, including the snow environment test method, will be described below.
The snow environment test method includes, in each system, the flaky ice making stage by the reamer type ice making device 22, the ice crushing stage into ice grains by the ice crusher, and the crushed ice grains being pumped and distributed. a distributing step of distributing by a device, a wet snow making step of making each distributed ice grain wet by a wet snow device, a step of blowing out the wet snow ice grains from the blowing nozzle 36, and snow blowing by the diffusion plate 74 While passing through the diffusion stage, the airflow supply system has a stage of supplying an airflow from a blower in order to carry the blowing snow blown out from the blowout nozzles 36 of each system onto the airflow from behind and blow it toward the vehicle.

In this case, first, the test schedule for the snow environment test system, especially the schedule for the amount of ice that is required per unit time, the concentration distribution of the snowstorm in the height direction, and the snow quality of the artificial snow (ice grain size, moisture content) ), the evaporation temperature of the refrigerant, the water temperature, and the rotation speed of the reamer 108 are set in the reamer type ice making device 22 (this point will be described in detail below), and in the ice crusher, a pair of Set the narrowest space between ice crushing drums, set the hot air temperature, humidity and flow rate according to the temperature and flow rate of the compressed air flow in the wet snow device, and set the rotation speed of the rotating body in the distribution device is set, and the distance from the blow nozzle 36 is adjusted in the diffusion plate 74 .

In particular, regarding the step of making flaky ice pieces by the reaming ice making device 22, as shown in FIG. The variable range of the ice-making amount per unit time according to the number of units in operation is grasped in advance. On the other hand, it is assumed that the ice making schedule is determined in advance in the snow environment test, and the required ice making amount per unit time increases as shown in FIG.
That is, at the beginning of the test (phase A), the amount of ice made per unit time for operating two reaming ice-making devices 22 is sufficient, and as the test progresses, two reaming ice-making devices 22 are operated (phase B), and the reaming ice-making device 22 is required for four machines (phase C), and finally, the number of reaming ice making devices 22 for five machines (phase D) is required.

Based on the variable range of the ice-making amount per unit time according to the number of units in operation, five of the reaming ice-making devices 22 of each system are selected in advance in consideration of the ice-making schedule, and each of the five devices is tested. At the start, a cylindrical thin ice layer L is formed after the temperature of the water to be frozen is adjusted to a desired temperature by circulating the refrigerant so that ice can be made by peeling by the reamer 108 .
At that time, after forming the cylindrical thin ice layer L, until the start of the phase A test, all or part of the five reaming ice making devices 22 are stopped driving. The rotational drive is stopped to stop the rotation of the reamer blades 112 and the annular body 162 of the water sprinkling part 104 about the axis of the rotating shaft 171, and the circulation of water between the water storage tank 168 and the annular body 162 in the water sprinkling part 104. Even if the water is stopped, the remaining water in the water spraying part 104 will freeze, and depending on the situation, the water spraying part 104 will be blocked. and has a watering nozzle 156 whose tip part 154 including the outflow opening 152 faces the ice making surface 150, and the tip part 154 of the watering nozzle 156 is cut so as to be inclined with respect to the extending direction of the watering nozzle 156. Therefore, the surface tension of the water reduces the adhesion force of the water that tends to accumulate, thereby reducing the amount of residual water and suppressing the residual water in the water spraying part 104, thereby preventing such a situation. By doing so, smooth ice making is possible.

First, in phase A, when the test is started, two reaming ice making devices 22 in each system make flaky ice pieces from an ice layer by the reaming speed of the reamers 108 . In this case, the required amount of ice is smaller than the maximum ice-making capacity per unit time of two reaming ice-making devices 22. Therefore, for example, in one reaming-type ice-making device 22, the number of reamer rotations constituting the detachment cycle in reamer 108 is set to As a maximum, the maximum amount of ice can be made per unit time. Coarse control by the number of operating ice-making devices 22 and fine control by ice-making parameters of the reamer-type ice-making device 22 make it possible to immediately make the amount of ice required for the test on the spot when required. .
At this time, the driving of the remaining three reamer-type ice making devices 22 is stopped, that is, the rotational driving of the rotating shaft 171 is stopped, and the rotating shaft 171 of the annular body 162 of the reamer blade 112 and the sprinkling portion 104 is stopped. Even if the rotation about the axis of is stopped and the circulation of water between the water storage tank 168 and the annular body 162 in the water spraying section 104 is stopped, the remaining water in the water spraying section 104 freezes, and in some cases the water spraying section 104 When the water is blocked and the next time ice is made, the water sprinkling itself may become impossible or difficult. Since the tip portion 154 of the water nozzle 156 is cut so as to be inclined with respect to the direction in which the water nozzle 156 extends, the adhesion force of the water that tends to accumulate due to the surface tension of the water is reduced. , the amount of residual water is reduced, and residual water in the water sprinkling section 104 is suppressed, thereby preventing such a situation and enabling smooth ice making.
The ice-made flaky ice pieces are crushed into ice particles by an ice crusher 26, and the ice particles are pressure-fed through a snow supply pipe 40 by an air current, distributed to a plurality of branch pipes by a distribution device 34, and distributed to a plurality of branch pipes. The wet snow is made wet by the snow-wetting device 32 and blown out from the blow-out nozzles 36 provided at the tip portions 154 of the respective branch pipes along with the low-temperature airflow from behind the blow-out nozzles 36 , and the blowing snow is spread by the diffusion plate 74 . It is sprayed onto the vehicle with a force and used for various environmental tests. When controlling the amount of ice-making per unit time, a table of the required number of ice-making machines with respect to the total required amount of artificial snow used in the environmental test and a change table of the required amount of artificial snow used in the environmental test are stored as a database, for example. may be created and controlled.

Next, in phase B, it is necessary to operate two reaming ice making devices 22, but compared to phase A, the amount of reduction from the maximum ice making amount per unit time of the two reaming ice making devices 22 is Therefore, in the other reamer-type ice making device 22, the reamer rotation speed of the reamer 108 is increased compared to phase A, thereby adjusting the ice making amount per unit time.

Next, in Phase C, it is necessary to operate four reaming ice making devices 22, and three reaming ice making devices 22 are fully operated to produce the maximum amount of ice per unit time. In one reamer-type ice making device 22 , the amount of ice made per unit time is adjusted by reducing the reamer rotation speed of the reamer 108 .
At this time, the rotation of the rotating shaft 171 of the remaining one of the reaming ice making devices 22 is similarly stopped, and the rotating shaft 171 of the reamer blades 112 and the annular body 162 of the sprinkling section 104 is set to the axis of the rotating shaft 171. Even if the rotation is stopped and the circulation of water between the water storage tank 168 and the annular body 162 in the water sprinkling part 104 is stopped, the remaining water in the water sprinkling part 104 is frozen, and the water sprinkling part 104 is prevented from being blocked in some cases. It is possible.

Finally, in Phase D, it is necessary to operate five reaming ice-making devices 22. Four reaming ice-making devices 22 are fully operated to produce the maximum amount of ice per unit time, In the other reamer-type ice making device 22 , the amount of ice made per unit time is adjusted by reducing the reamer rotation speed of the reamer 108 .
At this time, for all the five reaming ice making devices 22, since the remaining water in the water spraying section 104 is prevented from freezing and blocking the water spraying section 104 in some cases, the water spray itself can be immediately started when making ice. It is possible to start the ice making process smoothly.
In this case, in each system, flaky ice pieces made from a plurality of reaming ice-making devices 22 are mixed and used for an environmental test. It is preferable that the ice making conditions, the water temperature, the refrigerant evaporation temperature, or the reamer rotation speed of the reamer 108 in each reamer type ice making device 22 are the same.

As described above, when the variation in the amount of ice-making per unit time required in the snow environment test is determined in advance, the remaining water in the water spraying unit 104 is frozen before the test starts, and in some cases, the water spraying unit 104 is prevented from being blocked, a plurality of reaming ice-making devices 22 are set in an ice-making preparation state, and rough control by the number of reaming ice-making devices 22 and adjustment of ice-making parameters are performed when necessary. By using fine control together, for example, the required amount of ice can be made on the spot without deteriorating the quality of ice due to ice storage in the state of ice grains after crushing and without making too much ice. Real-time production is possible. Therefore, it contributes to conducting a snow environment test capable of obtaining highly reliable test data.
In addition, when the necessary fluctuation of the ice-making volume per unit time is determined in advance, the required ice-making volume per unit time may vary depending on the progress of the test, but even in such a case It is possible to respond flexibly by using such coarse control and fine control together.

According to the ice making device 22 having the above configuration, a thin layer of ice is formed on the ice making surface 150 by sprinkling water onto the ice making surface 150 whose temperature is controlled, and the thin layer of ice is peeled off from the ice making surface 150. Water is sprayed onto the ice making surface 150 by a water spray nozzle 156 inclined downward toward the ice making surface 150 when flake-shaped or plate-shaped ice is made.
For example, in an environmental test using artificial snow, when artificial snow is supplied to a test object under various conditions, the ice making device 22 must be operated intermittently to make ice. ice is made by freezing water on the ice making surface 150, the ice made is supplied as artificial snow to the test object, and the ice made is used as artificial snow to the test object During the time interval until the water is supplied again to the water spraying unit 104, the remaining water in the water spraying unit 104 freezes, and the water spraying unit 104 may be blocked in some cases. The watering portion 104 is inclined downward, and the tip portion 154 including the outflow opening 152 has a watering nozzle 156 facing the ice making surface 150 . Since it is cut obliquely, the surface tension of water reduces the adhesion force of water that tends to accumulate. By preventing such a situation, smooth ice making becomes possible.

Furthermore, after presetting the maximum thickness of the ice layer formed before breaking into flake-shaped ice pieces by the reamer and the ice temperature of the flake-shaped ice pieces to be made, Then, while maintaining the refrigerant evaporation temperature constant, the amount of ice made per unit time is increased, and the feed water temperature is lowered while increasing the reamer rotation speed. When transporting and using, as long as the necessary amount of ice can be secured per unit time, the thickness of the ice pieces is limited to a certain limit to reduce the obstacles of crushed ice during the ice crushing stage where flaky ice pieces are turned into ice particles. However, by adjusting the ice temperature of the flaky ice pieces, during the transportation stage in which the ice particles are transported through the transportation path, the ice particles adhere to the transportation path, clogging the transportation path, It is possible to efficiently and smoothly make flaky ice pieces having a desired ice temperature and/or desired ice thickness without increasing the size of the ice particles due to adhesion of the ice particles.

In the ice making device 22, various modifications are possible for the form of the ice making surface 150 and the form of peeling off the ice that has been made.
That is, the ice-making device 22 is provided with an ice-making surface 150, and by flowing water along the ice-making surface 150 cooled by a refrigerant, a thin ice layer L is formed on the ice-making surface 150, and the ice-making surface 150 is not contacted. In this embodiment, the thin ice layer L is peeled off from the ice making surface 150 to obtain flaky ice pieces. However, it may also be formed on the outer peripheral surface 160 of the cylindrical drum. Alternatively, the flaky ice pieces are peeled off from the ice making surface 150 by rotating them. You may peel off the ice pieces.
Alternatively, a rotating blade may be used to separate flaky ice pieces from the ice making surface 150 formed on the outer peripheral surface 164 of the fixed cylindrical drum.
In any case, when making ice, as long as water is sprayed from the upper portion of the ice making surface 150 from the water spray nozzles 156 of the water spray unit 104 and allowed to flow down, the remaining water in the water spray unit 104 freezes while the ice making device 22 is stopped. When the ice is made next, the water spraying portion 104 is blocked, and the water spraying itself may become impossible or difficult. A nozzle 156 is provided, and the tip 154 of the water nozzle 156 is cut so as to be inclined with respect to the direction in which the water nozzle 156 extends. By reducing the amount of residual water and thereby suppressing residual water in the sprinkler section 104, such a situation can be prevented, and smooth ice making becomes possible.

Although the embodiments of the present invention have been described in detail above, those skilled in the art can make various modifications and changes without departing from the scope of the present invention.
In the present embodiment, the description has been made on the premise that the ice is made by the reamer type. Combined ice making is also possible.
For example, in the present embodiment, the tip of the water nozzle is inclined downward in the extending direction of the water nozzle, and the outflow opening at the tip of the water nozzle with a circular cross section is elliptical and has a long axis. is directed downward, but as long as it is possible to prevent freezing of residual water at the tip of the sprinkler nozzle, the long axis may be directed upward or sideways, and the outflow opening is elliptical. It doesn't have to be.
In the present embodiment, the reamer type ice making has been described, but the present invention is not limited to this. In the ice making method for making flaky ice pieces by adjusting the peeling speed of peeling the flaky ice pieces from the peripheral surface of the ice layer formed in the ice layer formed before peeling the flaky ice pieces and the ice temperature of the flaky ice pieces to be ice-made, and the amount of ice made per unit time while maintaining the refrigerant evaporation temperature constant according to the set maximum thickness of the ice layer and the ice temperature Alternatively, the temperature of the feedwater used to form ice by freezing, the evaporation temperature of the refrigerant used to freeze the feedwater, and in an ice making method for making flaky ice pieces by adjusting the peeling speed for peeling the flaky ice pieces from the circumferential surface of the ice layer formed in an annular shape, The step of setting the thickness of the ice layer in advance, and increasing the ice making amount per unit time so that the thickness of the ice layer is constant, while decreasing the refrigerant evaporation temperature and decreasing the feed water temperature, increasing the peeling speed. It may also have a step of

For example, in the present embodiment, wet snow is used in the environmental test, but the present invention is not limited to this, and dry snow may be used as long as it can be crushed into ice particles by an ice crusher.
For example, in the present embodiment, the reamer revolves and rotates in the reamer ice making, but the invention is not limited to this, and the number of revolutions may be adjusted only by revolving the reamer.
For example, in the present embodiment, in the environmental test, snow blowing snow from the blowing nozzle is put on the back air current and used as a blowing snow. It may be used as a snowstorm by chiseling, or the ice produced may be used as natural snowfall in an environmental test.

1 is a schematic overall diagram of an environmental test system according to an embodiment of the present invention; FIG. 1 is a perspective view showing the internal structure of an ice maker in an environmental test system according to an embodiment of the present invention; FIG. FIG. 4 is a perspective view showing details of the annular body of the ice maker in the environmental test system according to the embodiment of the present invention; FIG. 4 is a perspective view showing the details of the water nozzle of the annular body of the ice-making machine in the environmental test system according to the embodiment of the present invention; FIG. 4 is a perspective view showing the details of the tip of the water nozzle of the annular body of the ice maker in the environmental test system according to the embodiment of the present invention; 4 is a graph showing rough adjustment of the amount of ice made from artificial snow per unit time in the environmental test system according to the embodiment of the present invention. 4 is a graph showing fine adjustment of the amount of ice made from artificial snow per unit time in the environmental test system according to the embodiment of the present invention.

V Vehicle α Tilt angle Θ Tilt angle
L thin ice layer l1 long axis l2 short axis 10 snow environment test system 12 snow blowing supply system 14 air flow supply system 16 wind tunnel 18 cold room 20 ice making chamber 22 ice making machine 24 ice temperature stabilization conveyor 26 ice crusher 28 blower 30 cooler 32 wet snow Device 34 Distribution device 36 Blow nozzle 38 Snowstorm collector 40 Snow supply pipe 42 Suction port 44 Air duct 102 Ice making cylinder 104 Sprinkler 106 Reservoir 108 Reamer 112 Blade 110 Refrigerant channel 111 Center shaft 150 Ice making surface 152 Outflow opening 154 Tip Part 156 Watering nozzle 158 Cylindrical body 160 Outer peripheral surface 162 Annular body 163 Hollow part 164 Outer peripheral surface 165 Internal space 166 Inner surface 168 Water storage tank 169 Liquid feed pump 170 Water supply pipe 171 Rotary shaft 173 Drive motor 174 Space 175 Casing

Claims (10)

In an ice-making device that makes ice on an ice-making surface,
Having a water spraying part for spraying water toward the ice making surface,
the water spray unit has a water spray nozzle inclined downward and having a tip portion including an outflow opening facing the ice making surface;
The tip of the water nozzle is cut so as to be oblique with respect to the extending direction of the water nozzle.
An ice making device characterized by 2. The ice making apparatus according to claim 1, wherein the tip of said water nozzle is inclined downward in the extending direction of said water nozzle. 3. The ice making apparatus according to claim 2, wherein the outflow opening at the tip of the water nozzle is elliptical with a major axis directed downward. The ice making device according to claim 2 or 3, wherein the inclination angle is 20 degrees or more and 30 degrees or less. The ice-making surface is the inner or outer peripheral surface of a cylindrical body, and the water sprinkling portion is an annular body concentric with the cylindrical body, and each of the water sprinkling parts is formed on the outer peripheral surface of the annular body at a predetermined angle in the circumferential direction. 2. The ice making apparatus of claim 1, wherein a plurality of spaced water spray nozzles are provided extending radially outward. 6. The ice making device according to claim 5, wherein the ice making device uses a blade type and/or a reamer type for separating a thin ice layer formed on the ice making surface from the ice making surface. 7. The ice making according to claim 6, wherein the material of the inner surface of the water nozzle is selected so as to exhibit desired water repellency or hydrophilicity according to the inner diameter of the water nozzle pipe, the nozzle inclination angle, and the inner surface roughness. Device. An ice making device that makes ice on an ice making surface,
Having a water spraying part for spraying water toward the ice making surface,
In the ice making device, wherein the water spray part has a water spray nozzle that slopes downward and has a tip part including an outflow opening that faces the ice making surface,
cutting the tip of the water nozzle so as to be oblique with respect to the extending direction of the water nozzle;
A method for repairing an ice-making device, characterized by: 9. The method for refurbishing an ice making device according to claim 8, wherein the tip of the water nozzle is slanted downward in the extending direction of the water nozzle. 10. The ice making device repair method according to claim 9, wherein the inclination angle is 20 degrees or more and 30 degrees or less.

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