JP3207331B2 - Harvest type 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 a harvesting type ice making device, and more particularly to an ice making device with improved ice making efficiency.

[0002]

2. Description of the Related Art In a harvest type ice making apparatus, cold water is sprinkled on the surfaces of a plurality of ice making plates in which a refrigerant of a refrigeration circuit is circulated, and the ice is frozen. The refrigerant hot gas at the compressor outlet side in the refrigeration circuit is circulated to separate the ice from the ice making plate, drop it by its own weight, and store it in the heat storage tank.

[0003] This device is used for air conditioning in buildings using night power, for air conditioning systems for district heating and cooling, for refrigeration of foods and selected products, for emergency or rapid cooling in chemical reaction processes, artificial snowfall, etc. It is suitable as an ice making device in a device or the like.

[0004]

However, in the conventional ice making plate used in the above ice making device, two stainless steel thin plates are closed by molding to form a meandering curved refrigerant passage. Since the periphery is formed by seam welding, advanced processing technology is required, the cost per sheet is increased, and it is difficult to increase the size due to the limitation due to the size of the seam welding machine. In addition, the refrigerant in the ice making plate is a 100% liquid refrigerant on the inlet side, and is completely gasified at the outlet part, which is a so-called direct expansion type. Due to restrictions, it was difficult to cope with the increase in capacity. Therefore, a large number of ice making plates are required to secure the required amount of ice making, and the size of the refrigeration circuit is required accordingly.

Another problem with the ice making device is how to determine the time for ice formation and the timing of deicing.
That is, the heat exchange efficiency, that is, the ice making capacity is reduced as the ice crystallized on the surface of the ice making plate grows, the amount of ice obtained per unit time is reduced, and the generated ice includes the left and right ends of the ice making plate. If the entire surrounding area is surrounded by this, it takes time to fall due to its own weight during deicing, and deicing mistakes may occur. In order to prevent this, if the supply of water to the surface of the ice making plate is restricted so that water does not splash on the left and right ends of the ice making plate, the area effective for ice making is reduced accordingly.

In addition, if the operation is continued without noticing a de-icing error, especially during unmanned operation, the ice thickness gradually increases, and ice including the adjacent ice making plate is blocked, so that the function of the ice making device may be stopped. For this reason, it is necessary to set a sufficient deicing time in consideration of safety, and this is a factor that lowers ice making efficiency.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to greatly reduce the cost per ice making plate and to enable the freedom of size and the increase in capacity. An object of the present invention is to provide a harvest-type ice making device in which the ice making capacity per unit area of an ice making plate is greatly increased and the whole device is made compact.

Another object of the present invention is to provide a harvesting type ice making apparatus in which ice generated without reducing the ice making effective area of the ice making plate is prevented from being formed at both left and right ends of the ice making plate and does not surround the entire periphery. To provide.

It is another object of the present invention to provide a harvesting type ice making apparatus which does not cause a deicing error.

Still another object of the present invention is to provide a harvest type ice making apparatus which can shorten the deicing time and increase the ice making efficiency.

[0011]

According to a first aspect of the present invention, there is provided an ice making plate made of an extruded aluminum alloy body having a refrigerant flow passage formed therein in a harvest type ice making device. And as a refrigerant supply system to the refrigerant passage, a part of the refrigerant supplied to the ice making plate is evaporated.
And a liquid circulation system in which the refrigerant after passing through the ice making plate becomes a gas-liquid two-phase flow .

[0012] In the invention according to claim 2, the ice making plate includes:
An ice making plate main body in which a plurality of refrigerant flow paths are opened along the extrusion direction, and an inner fin in which the surface area of the refrigerant flow path is increased 1.1 times or more; Upper and lower headers having one or both ends connected to the refrigerant pipe and having a plurality of refrigerant distribution pores communicating with the refrigerant flow path, and the lower header has a thickness of 10 mm in addition to the thickness of the ice making plate main body. It is characterized by being formed to the following thickness.

According to a third aspect of the present invention, the surface of the ice making plate is treated with zinc or zinc and a sealing agent.

The invention according to claim 4 is characterized in that the ice making plate body and the lower header are provided at both left and right end portions with a shape whose wetting angle with the ice making plate is obtuse.

According to a fifth aspect of the present invention, there is provided a light emitting device, comprising: a light projector and a light receiving device arranged opposite to each other at a lower portion of the ice making plate. Characterized in that it has means for detecting

[0016]

According to the first aspect of the present invention, since the ice making plate employs an extruded aluminum alloy, the ice making plate is supplied to the ice making plate.
Refrigerant after evaporating part of the refrigerant and passing through the ice making plate
Can be configured to be suitable for a liquid circulation system in which a gas-liquid two-phase flow is achieved. That is, in the liquid circulation system, only a part of the refrigerant liquid supplied to the ice making plate is evaporated, so that when the cross-sectional area of the refrigerant channel is the same, the length of the channel needs to be shorter than that of the direct expansion type. The stainless steel ice making plate, the coolant flow path has only one place, but refrigerant ice making plates for passage length flowing while folded over the entire surface becomes long, the aluminum alloy extruded body, a plurality through upper and lower headers Since the flow path is provided, the length of the flow path can be shortened, and an ice making plate suitable for a liquid circulation system can be obtained. In addition, if necessary, a plurality of folded structures can be provided by providing partitions on the upper and lower headers, so that the gas-liquid ratio at the refrigerant outlet can be freely selected even when the height of the ice making plate is short. It is possible to

As described above, since the cross-sectional area of the refrigerant flow path, the flow path length, the flow rate of the refrigerant and the like of the ice making plate can be freely selected,
It is possible to select an ice making plate having an optimum shape for various conditions as an ice making device.

An ice making plate made of an extruded aluminum body is formed by connecting the ice making plate main body and the upper and lower headers by TIG or MI.
Since it can be manufactured by G welding, there is no restriction on the size of a seam welder such as a stainless steel ice plate, and the degree of freedom with respect to the size of the ice plate to be manufactured is large.

Therefore, it is possible to employ an ice making plate having a larger size and a more practical size than the conventional ice making plate. Further, by adopting the refrigerant circulation system, the forced flow evaporation of the refrigerant over the entire surface of the ice making plate is ensured. The coefficient is increased and the ice making capacity is greatly increased. As a result, the required ice making plate area is reduced, and the ice making device is reduced in size due to the reduction in the number of required ice making plates, so that an inexpensive harvest-type ice making device can be provided.

According to the second aspect of the present invention, the inner fin is formed in the cross section of the refrigerant flow path to increase the inner area and decrease the equivalent diameter of the flow path, thereby increasing the evaporation heat transfer coefficient. By providing a plurality of refrigerant distribution pores in the lower header, the refrigerant is evenly supplied to each refrigerant flow path inside the ice making plate, causing uniform refrigerant evaporation over the entire ice making plate,
Use as an effective ice making surface. In addition, the thickness of the lower header is kept to be equal to or less than the thickness of the ice making plate main body +10 mm or less, so that deicing is easily performed, and the deicing time is reduced, that is, the ratio of the ice making time to the operation time is increased.

As a result, the ice making capacity per unit area of the ice making plate is increased to further support the object of claim 1.

According to the third aspect of the present invention, the surface of the aluminum alloy is treated with zinc or zinc and a sealing agent, so that the water sprayed on the ice making plate is highly corrosive, or the use environment is poor due to the poor use environment. It can be used when the corrosion resistance of the alloy is poor.

According to the fourth aspect of the present invention, ice can be prevented from being formed at both left and right ends of the ice making plate, and the shape of the ice making plate forms an obtuse angle with the ice making plate so that the ice can be easily separated. De-icing is performed more smoothly.

According to the fifth aspect of the present invention, in the harvesting type ice making device, if deicing fails, ice blocking occurs. Therefore, it is necessary to prolong the deicing time for safety. If ice failure is detected and measures are taken automatically, the setting of the deicing time can be minimized, and the ratio of the ice making time to the operating time increases, and the ice making efficiency can be increased. .

[0025]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 schematically shows the overall configuration of a harvest type ice making apparatus according to the present invention. The refrigeration circuit in FIG. 1 includes a compressor 1, a condenser 2, expansion valves 3 and 4, a flash tank 5, a refrigerant pump 6, and piping connecting these, and two pairs of automatic switches for switching above and below this piping route. Valve 7
A plurality of ice making plates 8 made of an extruded aluminum alloy body connected to the refrigerant flow path via a and 7b are arranged. Although FIG. 2 shows a state in which two ice making plates 8 are arranged, actually, there are more ice making plates 8 arranged in a tandem state.

A sprinkling tank 9 is arranged above each ice making plate 8, and a heat storage tank 10 is arranged below the ice making plate 8. The mixture of cold water or ice water stored here is circulated and supplied to an air conditioner (not shown). Is done. At the time of ice making, the water stored here is supplied to a watering tank 9 through a cold water pump 11.
And sprayed to each ice making plate 8 through a nozzle 12 provided here.

The refrigeration circuit alternately repeats an ice making cycle and a deicing cycle with respect to the ice making plate 8,
The following actions are performed.

[Ice-Making Cycle] First, in the ice-making cycle, of the automatic valves 7a and 7b, the ice-making automatic valve 7a is opened and the de-ice automatic valve 7b is closed. The refrigerant gas is adiabatically compressed by the compressor 1 to become a high-temperature and high-pressure hot gas, and is condensed in the condenser 2. The condensed high-temperature and high-pressure refrigerant is
It is guided to the flash tank 5 through the expansion valve 3 and adiabatically expanded, a part of which evaporates to a low-temperature low-pressure gas, and the rest becomes a low-temperature low-pressure liquid. It is stored.

The refrigerant liquid is supplied from the lower part of the flash tank 5 to each ice making plate 8 by the refrigerant pump 6 through the automatic valve 7a, and flows through the internal refrigerant flow path from the lower part to the upper part of the ice making plate. By evaporating a part of the water, the water sprayed on the outer surface of the ice making plate 8 is cooled, and ice is generated on the surface.

In this system, a refrigerant circulation system in which only a part of the refrigerant is evaporated in the ice making plate 8 is adopted, and the refrigerant after passing through the ice making plate 8 becomes a gas-liquid two-phase flow and becomes a flash tank. Returning to step 5, only the refrigerant gas separated from the entrained liquid is supplied to the compressor 1, and the above cycle is repeated.

[De-Icing Cycle] When the ice has grown to a predetermined thickness by the above-described ice-making cycle, the automatic valve 7a is closed, the automatic valve 7b is opened, and the high-temperature high-pressure hot gas at the outlet of the compressor 1 is supplied to the ice-making plate. 8 is supplied from the upper side to the lower side.

The ice melts at the contact surface with the surface of the ice making plate 8 due to the heat of condensation of the hot gas supplied to the inside of the ice making plate 8, and the ice blocks that have grown on the surface of the ice making plate 8 fall off by their own weight, and become a heat storage tank. Each time the ice making and deicing cycles are repeated, the amount of ice in the heat storage tank 10 increases.

The high-temperature and high-pressure refrigerant that has passed through the ice making plate 8 and condensed passes through the expansion valve 4 and is adiabatically expanded.
Returning to the inside, the gas is sucked into the compressor, and the liquid becomes a part of the circulating refrigerant supplied into the ice making plate 8.

By subjecting the surface of the aluminum alloy to treatment with zinc or zinc and a sealing agent, it can be used even when the water for ice making is highly corrosive or when the use environment is poor and the corrosion resistance of the aluminum alloy is poor. can do.

Further, the ice making plates 8 are densely arranged for each of a plurality of blocks, and the cycle of ice making and deicing is alternately repeated for each block so that ice is always supplied to the heat storage tank 10. Although FIG. 1 illustrates the case where the heat storage tank is installed below the ice making plate, when the heat storage tank is installed separately from the ice making plate, the heat storage tank can be transferred by the ice water transfer device.

Further, the above-mentioned ice making device can produce not only ice water but also cold water only, ice only and warm water. Although FIG. 1 illustrates the case where the heat storage tank is installed below the ice making plate, when the heat storage tank is installed separately from the ice making plate, the heat storage tank can be transferred by the ice water transfer device.

When it is desired to obtain only cold water, only the ice making cycle is continued and the evaporation temperature of the refrigerant in the ice making plate 8 is increased, or water at a temperature higher than that during ice making is applied to the surface of the ice making plate 8. If sprayed, cold water is obtained sequentially by heat exchange. In this case, if the water stored in the heat storage tank 10 is sprayed without circulating, it is possible to avoid extremely lowering of the water temperature and generation of ice.

Conversely, if you want to obtain only ice,
The deicing cycle may be repeated alternately, and a perforated belt conveyor for ice-water separation or the like may be arranged on the heat storage tank 10, and only the ice may be separated and transferred to another storage place by the conveyor.

When it is desired to obtain hot water, the water that has exchanged heat with the hot gas through the ice making plate 8 is sequentially heated by continuing only the deicing cycle. In this case, the obtained hot water can be used for air conditioning for heating in winter and the like.

Next, details of the ice making plate 8 will be described with reference to FIGS.

The ice making plate 8 in the figure is formed of an aluminum alloy extruded product formed in a plate shape having a predetermined thickness t, and has a plurality of refrigerant passages 20a formed therein in parallel with a predetermined pitch along the extrusion direction. And an upper header 21 made of an extruded aluminum alloy and integrated at one end or both ends with a refrigerant pipe of the refrigeration circuit and connected to the refrigerant flow path 20a. And one end or both ends connected to a refrigerant pipe of the refrigeration circuit, and
0a, a lower header 22 made of an extruded aluminum alloy, and a side plate 23 (shaped body) made of rubber, Teflon, or the like, which is attached to both sides of the main body 20 and the lower header 22 and has a wetting angle θ of an obtuse angle. It consists of

The cross-sectional shape of each refrigerant passage 20a in the main body 20 can be freely selected such as a circle, an ellipse, a square, and the like. As shown in FIGS. Is formed by extrusion molding, and the inner diameter of the inner fin 20b is reduced by 1.1 times or more. The inner fin 20b reduces the equivalent diameter and increases the internal heat transfer area to increase the refrigerant-side heat transfer coefficient. be able to.

As shown in FIG. 4, the thickness T of the lower header 22 is at least the thickness t + 10 m of the main body 20.
m is set to a thickness t equal to or less than m, so that the falling of ice at the time of deicing is smooth, and a plurality of coolant channels 22a orthogonal to one long hole-shaped refrigerant passage 22a opened in the longitudinal direction are provided. Micropores 22b are formed and communicate with the respective coolant channels 20a on the main body 20 side.

Each of the fine holes 22b is set to have a diameter sufficiently smaller than that of the refrigerant flow path 22a, so that it also serves as a refrigerant distribution box, and the refrigerant flowing through the lower header 22a passes through the fine holes 22b into each of the refrigerant flow paths 20a. , So that the entire surface area of the main body 20 can be effectively used as a heat exchange surface. Note that the common passage 22 is provided at the outlet of the pore 22b.
c, the position of the pore 22b is
It can be provided without considering the position of a.

The shape of the side plate 23 is shown in FIGS.
This was set according to the details shown in FIG.

That is, as shown in FIG.
When the side plates 23 are not arranged on both left and right sides of the ice making plate, when water is supplied to the entire surface of the ice making plate, the wet surface of the water increases with the generation of ice, and as a result, the ice b grown in the ice making cycle is The ice is formed by connecting the front and back surfaces of the 20 and surrounding the entire area, which hinders the deicing cycle, prolongs the deicing time or causes a deicing mistake.

In order to prevent this, it is conceivable to first attach a member corresponding to the wall 23 'on both sides so as to prevent ice from entering as shown in FIG. It was difficult to peel off the ice while it was fixed at the corner where the ice was fixed, and smooth deicing was not performed. Therefore, as a result of examining various side plate shapes, as shown in FIGS. 3 (c), 3 (d) and FIG. 3, the side plate 23 having a shape in which the wetting angle θ is an obtuse angle facilitates deicing, and this shape is improved. It turned out to be effective.

In order to realize the present invention, it is possible to use an aluminum alloy extruded product having obtuse angles at both ends of the ice making plate main body 8, but as described above, rubber or Teflon or the like may be used. A method in which the shaped body is attached to both ends of the ice making plate also works well.

Next, the detecting means for detecting the switching between ice making and deicing will be described with reference to FIGS. This detecting means is shown in FIG.
As shown in the figure, a plurality of ice making plates 8 arranged in a row, a pair of light emitting devices 30 and a light receiving device 31 composed of a photoelectric conversion element are provided on both sides of the ice making plates 8, and the optical axis L of the light emitting device 30 is provided. Is fixedly arranged toward the light receiving surface of the light receiver 31. When the ice b grows to a thickness d or more below the position where the ice b interferes with the optical axis at the lower part of each ice making plate 8, the light receiver 3
Utilizing the fact that the amount of received light 1 decreases, this is taken out as a detection signal and used as an operation control element of the device by a microcomputer or the like.

FIG. 7 shows the operation sequence.
First, the ice making cycle (Step 1)
Becomes When the ice b is not growing, the amount of light received by the light receiver 31 is kept constant, and its output exceeds the set lower limit. When the ice b grows to a predetermined thickness d or more below the ice making plate 8 from this state, a part of the light emitted from the light projector 30 is scattered by the ice b, and the amount of light received by the light receiver 31 decreases. Then, the growth of the amount of ice due to icing is confirmed (step 2). As a result, a switching circuit (not shown) is driven to close the automatic valve 7a, open the automatic valve 7b, and switch to the deicing cycle (step 3). When all the ice b has fallen, the light receiving amount of the light receiver 31 is restored to the initial value again. As a result, when the deicing is confirmed (step 4), this signal is received and the automatic switching circuit is again operated through the switching circuit. By opening the valve 7a and closing the automatic valve 7b, the ice making cycle of Step 1 is repeated again. The heat storage tank 10
When the vehicle becomes full ice (step 5), an operation stop process (step 6) is performed, and all operations are stopped.

The lower end thickness d of the ice b and the light emitter / receiver 30,
The positional relationship of 31 is set in consideration of the amount of ice to be generated and factors that are convenient for deicing. This structure is economical because the detection is performed only by the pair of light emitting and receiving devices 30 and 31 irrespective of the large number of ice making plates 8.
Unless all parts are de-iced, the amount of received light does not return to the original amount, so that there is an advantage that a de-icing error does not occur.

The light emitters and receivers 30 and 31 are used for making ice.
In systems where deicing is performed by a timer or other method, it can be used as a means to prevent ice blocking by detecting ice overgrowth.

Further, at the time of deicing, the watering nozzle 12 provided in the watering tank 9 is closed, or the watering tank 9 is partitioned for each block of the ice making plate, and the supply of cold water to a portion corresponding to the block being deiced is stopped. When the supply of the cold water to the ice making plate 8 during the deicing is stopped, the deicing time can be shortened, and the ice making efficiency can be improved.

[0055]

As described in detail in the above embodiment, in the harvesting type ice making device according to the first aspect of the present invention, since the ice making plate is made of an aluminum alloy extruded product ,
A part of the refrigerant supplied to the ice making plate is evaporated and passed through the ice making plate.
A liquid circulation system in which the refrigerant after passing through becomes a gas-liquid two-phase flow can be adopted, and by adopting the liquid circulation system, the heat transfer efficiency becomes higher than the conventional direct expansion type, resulting in a compact and inexpensive harvest type. An ice making device can be provided.

According to the second aspect of the present invention, the heat transfer coefficient of refrigerant evaporation can be further increased by forming the inner fins, and by providing the header with a plurality of distribution pores, the ice making plate main body can be formed. The refrigerant can be uniformly supplied to each of the refrigerant passages in the inside, the entire surface of the ice making plate can be effectively used, and the lower header is made to be less than the thickness of the ice making plate main body + 10 mm or less, so that deicing can be performed. It can be performed smoothly, and the ice making capacity per unit area can be greatly increased.

According to the third aspect of the present invention, the surface of the aluminum alloy is treated with zinc or zinc and a sealing agent so that the water for ice making is highly corrosive, or the use environment is poor and the aluminum alloy is poor. Can be used when the corrosion resistance is poor.

According to the structure of the fourth aspect, ice can be prevented from being generated at the end of the ice making plate, and deicing can be performed smoothly. In addition, the deicing is performed more smoothly because the shape of the ice making plate forms an obtuse angle.

According to the fifth aspect of the present invention, in the harvest type ice making device, if deicing fails, ice blocking occurs. Therefore, it is necessary to prolong the deconcreting time for safety. Detects deicing failure,
Since measures can be taken automatically, the deicing time can be kept to a minimum and the ice making efficiency can be increased.

Therefore, according to the present invention, an ice making device for a cold storage system using night electric power, such as for building air conditioning, district heating and cooling, or an ice making device for refrigeration of food and fresh products, and an emergency use in a scientific reaction process and the like. It is suitable for use in an ice making device for rapid cooling and an ice making device for artificial snowfall.

[Brief description of the drawings]

FIG. 1 is a system diagram showing an overall configuration of a harvest type ice making device according to the present invention.

FIG. 2 is a front view of an ice making plate used in the apparatus.

FIGS. 3A and 3B are cross-sectional views taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

FIG. 5 is a plan view for explaining the process of determining the shape of the side plate.
You .

FIG. 6 is an explanatory diagram showing a positional relationship between an ice making plate and a light emitting and receiving device for detection.

FIG. 7 is a flowchart showing an operation sequence of the device using the light emitting and receiving device.

[Description of Signs] 1 Compressor 2 Condenser 3, 4 Expansion valve 5 Flash tank 6 Refrigerant pump 8 Ice plate 9 Watering tank 10 Heat storage tank 11 Cold water pump 12 Nozzle 20 Ice plate main body 20a Refrigerant flow path 20b Inner fin 21 Upper part Header 22 Lower header 22a Refrigerant channel 22b Pores 23 Side plate (shape) 30 Projector 31 Receiver

Continuing from the front page (72) Inventor Katsuhito Fujiwara 3-3-22 Nakanoshima, Kita-ku, Osaka-shi, Osaka Inside Kansai Electric Power Co., Inc. (72) Inventor Masahiko 3-2-2 Nakanoshima, Kita-ku, Osaka, Kansai Electric Power Co., Ltd. (72) Inventor Keizo Kadono 4-73-32 Takeshima, Nishiyodogawa-ku, Osaka-shi, Osaka Prefecture Inside Sasakura Inc. (72) Inventor Hiroshi Kashiwagi 4-7-132 Takeshima, Nishiyodogawa-ku, Osaka-shi, Osaka Inside Sasakura (72) Inventor Masahiro Adachi 4-7-32 Takeshima, Nishiyodogawa-ku, Osaka-shi, Osaka Prefecture Inside Sasakura Inc. (72) Inventor Shunji Hachisuka 4-33 Kitahamahigashi, Chuo-ku, Osaka-shi, Osaka Obayashi Corporation Inside the main store (72) Yoshihiro Kitamura, Kita-hama East 4-33, Chuo-ku, Osaka-shi, Osaka Prefecture Inside the Obayashi-gumi head office (72) Inventor Yoshio Gomachi 4-33, Kitahama-higashi, Chuo-ku, Osaka-shi, Osaka Obayashi head office (56) References JP-A-5-240474 (JP, A) JP, U) Japanese Utility Model Hei 7-2865 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25C 1/12 F24F 5/00

Claims (5)

(57) [Claims] 1. An ice making plate made of an extruded aluminum alloy body having a cooling medium passage formed therein, wherein a part of the cooling medium supplied to the ice making plate is provided as a cooling medium supply method to the cooling medium flow path.
Evaporates and the refrigerant after passing through the ice making plate becomes a gas-liquid two-phase flow.
Harvest ice making apparatus characterized in that the employed liquid circulation method comprising. 2. An ice making plate main body in which a plurality of refrigerant flow paths are opened inside in the extrusion direction, and an inner fin in which the surface area of the refrigerant flow path is increased to 1.1 times or more is formed. An upper and lower header integrated at the top and bottom of the main body, having one or both ends connected to the refrigerant pipe and having a plurality of distribution pores communicating with the refrigerant flow path, wherein the lower header has a thickness of the ice making plate main body. The harvesting type ice making device according to claim 1, further comprising a thickness of 10 mm or less. 3. The harvesting type ice making device according to claim 1, wherein the surface of the ice making plate is treated with zinc or zinc and a sealing agent. 4. The harvesting type according to claim 1, wherein both ends of the ice making plate main body and the lower header have a shape whose wetting angle with the ice making plate becomes an obtuse angle. Ice making equipment. 5. A means comprising a light projector and a light receiver arranged opposite to a lower portion of the ice making plate, and having a means for detecting that ice generated at a lower portion of the ice making plate has a constant thickness due to a light scattering state. The harvesting type ice making device according to any one of claims 1 to 4, wherein: