JPH08261614A - Harvest type ice making device - Google Patents

Abstract

PURPOSE: To provide a harvest type ice making device which makes it possible to reduce cost per an ice making board dramatically and increase the degree of freedom about size and enlarge its capacity and increase dramatically an ice making power for a unit area of the ice making board and make compact the entire device. CONSTITUTION: To embody ice making based on a liquid circulation system, there are provided an ice making board 8 which comprises an aluminum alloy extrusion molded body forming a refrigerant passage inside and a water spray nozzle 12 which supplies water to the surface of the ice tray 8 and a compressor 1 which supplies refrigerants to the refrigerant passage and a condenser 2 and an expansion valve 3 and a flash tank 5 and a refrigerant pump 6 and a refrigeration circuit provided with a pipeline which connects the above units and automatic valves 7a and 7b which are installed in the refrigeration circuit and circulate refrigerants under low temperature and low pressure in the ice making board 8 during ice making and change over the circuit to circulate refrigerants under high temperature and high pressure during ice removal.

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 having improved ice making efficiency.

[0002]

2. Description of the Related Art Harvest-type ice-making equipment sprays cold water onto the surfaces of a plurality of ice-making plates in which the refrigerant in a refrigeration circuit is circulated to freeze them, and when they have grown to a certain thickness, they are replaced with the refrigerant. The refrigerant hot gas on the outlet side of the compressor in the refrigeration circuit is circulated, the ice is separated from the ice making plate and dropped by its own weight to be stored in the heat storage tank.

This device is used for building air-conditioning systems that use night-time power, for district cooling and heating air-conditioning systems, for refrigerating foods and selected products, for emergency or rapid cooling in chemical reaction processes, and for artificial snowfall. 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 meanderingly bent refrigerant passage, Since the structure is seam-welded at the periphery, a high processing technology is required, the cost per sheet is high, and it is difficult to increase the size due to the limitation of the size of the seam welding machine. Further, since the refrigerant in the ice making plate is a 100% liquid refrigerant at the inlet side and is completely gasified at the outlet part, which is a so-called direct expansion type, the structure and strength for securing the cross section of the refrigerant flow path are high. Due to the limitation, it was difficult to cope with the large capacity. Therefore, a large number of ice making plates are required to secure the required ice making amount, and a refrigerating circuit scale is required accordingly.

Another problem in this ice making device is how to control the time of ice formation and the timing of deicing.
That is, as the crystallized ice grows on the surface of the ice making plate, the heat exchange efficiency, that is, the ice making capacity decreases, and the amount of ice obtained per unit time decreases, and the generated ice includes the left and right ends of the ice making plate. If the entire circumference is surrounded by the ice, it will take a long time to fall due to its own weight during ice removal, and an ice removal error will occur. In order to prevent this, if the water supply part to the surface of the ice making plate is restricted so that the right and left ends of the ice making plate are not splashed, the effective area for ice making will be reduced accordingly.

Further, particularly during unmanned operation, if the operation is continued without noticing a mistake in de-icing, the thickness of the ice gradually increases, and the ice including the adjacent ice-making plates may be blocked to stop functioning as an ice-making device. For this reason, it is necessary to set a sufficient de-icing time in anticipation of safety, which has been a factor that reduces the ice making efficiency.

The present invention is intended to solve the above problems, and an object thereof is to greatly reduce the cost per sheet of ice making plate, and also to achieve the degree of freedom in size and the increase in capacity. (EN) Provided is a harvest-type ice making device in which the ice making capacity per unit area of an ice making plate is significantly increased to make the whole device compact.

Another object of the present invention is to provide a harvesting type ice making device in which the ice produced without reducing the ice making effective area of the ice making plate is prevented from being produced at the left and right ends of the ice making plate and does not surround the entire circumference. It is provided.

Still another object of the present invention is to provide a harvesting type ice making device which does not cause a mistake in deicing.

Still another object of the present invention is to provide a harvest-type ice making device capable of shortening de-icing time and enhancing ice making efficiency.

[0011]

In order to achieve the above-mentioned object, the invention according to claim 1 is a harvest type ice making device, which comprises an ice making plate made of an aluminum alloy extruded body in which a refrigerant passage is formed. A liquid circulation method is adopted as a refrigerant supply method to the refrigerant flow path.

According to a second aspect of the present invention, the ice making plate is
An ice making plate main body in which a plurality of refrigerant flow paths are opened inside along the extrusion direction and inner fins for expanding the surface area of the refrigerant flow paths by 1.1 times or more are formed, and above and below the main body. And an upper and lower header having a plurality of refrigerant distribution pores connected to the refrigerant pipe at one or both ends and communicating with the refrigerant flow path, the lower header being 10 mm in addition to the thickness of the ice making plate body. It is characterized in that it is formed with the following thickness.

The invention according to claim 3 is characterized in that 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 left and right end portions of the ice making plate body and the lower header are shaped bodies having an obtuse angle with the ice making plate.

According to a fifth aspect of the present invention, the ice-making plate comprises a light projector and a light-receiver which are arranged to face each other under the ice-making plate. Is included.

[0016]

According to the structure of the first aspect, since the ice making plate uses the aluminum alloy extruded body, it is possible to have a structure suitable for the liquid circulation system. That is, in the liquid circulation system, since only a part of the refrigerant liquid supplied to the ice making plate is evaporated, it is necessary to shorten the channel length as compared with the direct expansion type when the refrigerant channel sectional areas are the same. With stainless steel ice plate,
Since there is only one refrigerant flow path and the refrigerant flows over the entire surface of the ice making plate while folding back, the flow path length is long, but in the aluminum alloy extrusion molded body, multiple flow paths are provided through the upper and lower headers. Therefore, the flow path length can be shortened, and the ice making plate having a configuration suitable for the liquid circulation system can be obtained. It is also possible to have a multi-folded structure by providing partitions on the upper and lower headers if necessary, so even if the height of the ice making plate is short, you can freely select the gas-liquid ratio at the refrigerant outlet. It is possible to

As described above, the refrigerant passage cross-sectional area, the passage length, the refrigerant flow rate, etc. 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.

In addition, the ice-making plate made of an aluminum extrusion molding has a body made of the ice-making plate and upper and lower headers made of TIG or MI.
Since it can be manufactured by G welding, it is not limited by a seam welding machine such as a stainless steel ice plate and has a large degree of freedom with respect to the size of the ice plate to be manufactured.

Therefore, it is possible to use an ice making plate which is larger and more practical than the conventional ice making plate. Further, by adopting the refrigerant circulation system, the forced flow evaporation of the refrigerant on the entire surface of the ice making plate is secured, and the evaporation heat transfer is performed. The coefficient increases and the ice making capacity increases significantly. As a result, the required ice making plate area is reduced and the required number of ice making plates is reduced, so that the ice making device can be made compact, and an inexpensive harvesting type ice making device can be provided.

According to the second aspect of the invention, the inner fins are formed in the cross section of the refrigerant passage to increase the inner area and the diameter of the passage, 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 channel inside the ice making plate, causing uniform refrigerant evaporation over the entire ice making plate,
It is used as an effective ice-making surface. Further, the thickness of the lower header is controlled to less than the thickness of the ice making plate main body +10 mm to facilitate de-icing, and the de-icing time is shortened, that is, the ratio of the ice making time to the operating time is increased.

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

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

According to the fourth aspect of the present invention, it is possible to prevent the generation of ice on the left and right ends of the ice making plate, and to make the shape of the ice making plate form an obtuse angle to facilitate the peeling of the ice. , Deicing is done more smoothly.

According to the fifth aspect of the invention, in the harvest type ice making device, if deicing fails, ice blocking occurs, so it is necessary to prolong the deicing time for safety. If ice failure is detected and measures are taken automatically, the de-icing time can be set to the minimum necessary, the proportion of ice-making time in operating time can be increased, and ice-making efficiency can be improved. .

[0025]

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

FIG. 1 is a schematic view showing the overall structure of a harvest type ice making device 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 a pipe connecting them, and two pairs of automatic switching lines are provided above and below the pipe path. Valve 7
A plurality of ice-making plates 8 made of an aluminum alloy extruded body are arranged in which refrigerant channels are connected via a and 7b. Although the figure shows a state in which two ice making plates 8 are arranged, in actuality, the number is larger than that, and they are arranged in a column.

A water 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. A mixture of cold water or ice water stored therein is circulated to an air conditioner (not shown). To be done. In addition, during ice making, the water stored here passes through the cold water pump 11 to the sprinkling tank 9
And is sprayed onto each ice making plate 8 through the nozzle 12 provided here.

The refrigerating circuit alternately repeats the ice making cycle and the deicing cycle on the ice making plate 8.
It has the following effects.

[Ice Making Cycle] In the ice making cycle, first of all the automatic valves 7a and 7b, the automatic ice making valve 7a is opened and the automatic ice removing valve 7b is closed. The refrigerant gas is adiabatically compressed by the compressor 1 to become high-temperature high-pressure hot gas, which 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, and part of it evaporates into low-temperature low-pressure gas, and the rest becomes low-temperature low-pressure liquid, which is separated into two phases inside the flash tank 5. It can be stored.

Of these, 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 refrigerant flow path inside the ice making plate from the lower part to the upper part. The water sprinkled on the outer surface of the ice making plate 8 is cooled by the evaporation of a part thereof, 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 is a flash tank. Returning to step 5, only the refrigerant gas separated from the entrained liquid is supplied to the compressor 1 side, and the above cycle is repeated.

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

Due to the heat of condensation of the hot gas supplied to the inside of the ice making plate 8, the ice melts at the contact surface with the surface of the ice making plate 8, and the ice blocks growing on the surface of the ice making plate 8 drop off by their own weight, and the heat storage tank The amount of ice stored in the heat storage tank 10 increases every time the ice making and de-icing cycles are sequentially repeated.

The high-temperature high-pressure refrigerant condensed after passing through the ice making plate 8 passes through the expansion valve 4 and undergoes adiabatic expansion, and the flash tank 5
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 treating the surface of the aluminum alloy 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 environment of use is poor and the corrosion resistance of the aluminum alloy is poor. can do.

Further, by arranging the ice-making plates 8 densely in each of a plurality of blocks and alternately repeating the ice-making and de-icing cycle for each block, the ice can be constantly supplied to the heat storage tank 10. In addition, although the case where the heat storage tank is installed below the ice making plate is illustrated in FIG. 1, when the heat storage tank is installed apart from the ice making plate, the heat storage tank can be transferred by the ice water transport device.

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

When only cold water is to be obtained, only the ice making cycle is continued and the evaporation temperature of the refrigerant in the ice making plate 8 is raised, or water having a temperature higher than that at the time of ice making is applied to the surface of the ice making plate 8. If sprayed, cold water can be sequentially obtained by heat exchange. In this case, if the water stored in the heat storage tank 10 is sprayed without being circulated, it is possible to avoid an extreme drop in water temperature and the formation of ice.

On the contrary, when it is desired to obtain only ice, the above-mentioned ice making,
The deicing cycle may be repeated alternately, and a perforated belt conveyor for ice-water separation may be arranged on the heat storage tank 10 so that only ice is separated and transferred to another storage location by the conveyor.

If 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.

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

The ice making plate 8 in the figure is made of an aluminum alloy extruded body formed in a plate shape having a predetermined thickness t, and has a plurality of refrigerant flow passages 20a formed therein in parallel at a predetermined pitch along the extrusion direction. The ice-making plate main body 20 and the upper header 21 which is integrated with the upper portion of the main body 20 and has one or both ends connected to the refrigerant pipe of the refrigeration circuit and which is made of an aluminum alloy extruded body communicating with the refrigerant flow passage 20a. And the one end or both ends are connected to the refrigerant pipe of the refrigeration circuit and are integrated with the lower portion of the main body 20, and the refrigerant flow path 2
Lower header 22 made of an aluminum alloy extruded body communicating with 0a, and a side plate 23 (shaped body) made of rubber, Teflon, etc., which is attached to both sides of the main body 20 and the lower header 22 and has an obtuse angle of wetting angle θ. It consists of

The cross-sectional shape of each refrigerant flow passage 20a in the main body 20 can be freely selected such as a circle, an ellipse, and a square. Further, as shown in FIGS. Is formed by extrusion molding, and the inner fin 20b reduces the equivalent diameter and increases the internal heat transfer area, thereby increasing the heat transfer coefficient on the refrigerant side. be able to.

As shown in FIG. 4, the thickness T of the lower header 22 is at least the thickness t of the main body 20 + 10 m.
By setting the thickness t to be equal to or less than m, the ice can be smoothly dropped at the time of deicing, and a plurality of long-hole-shaped refrigerant passages 22a opened in the longitudinal direction are orthogonal to each other. The pores 22b are formed so as to communicate with the respective refrigerant passages 20a on the main body 20 side.

The diameter of each of the fine holes 22b is set to be sufficiently smaller than that of the refrigerant flow path 22a so that it also serves as a distribution box for the refrigerant, and the refrigerant flowing in the lower header 22a is in the respective refrigerant flow paths 20a through the fine holes 22b. Is evenly distributed and supplied, which allows the entire surface area of the main body 20 to be effectively utilized as a heat exchange surface. The shared passage 22 is provided at the outlet of the pore 22b.
By providing c, the positions of the pores 22b are set to the refrigerant flow path 20.
It can be provided without considering the position of a.

The shape of the side plate 23 is shown in FIG.
It was set according to the circumstances shown in (c).

That is, as shown in FIG.
When the side plates 23 are not arranged on both left and right sides of 0, 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 a grown in the ice making cycle is The front and back sides of 20 are tied together to form ice around the entire periphery thereof, which interferes with the deicing cycle, prolongs the deicing time, and causes deicing mistakes.

In order to prevent this, it is first conceivable to mount the ones corresponding to the walls 23 'on both sides so that the ice does not go around as shown in FIG. 9B, but in reality, the wall 23' is actually used. It was difficult to peel off the ice because it was still stuck in the corners of and, and smooth deicing was not performed. Then, as a result of examining various side plate shapes, as shown in FIGS. 3C and 3D and FIG. 3, the side plates 23 having an obtuse wetting angle θ make the deicing smooth, and this shape is Proved to be effective.

In order to realize the present invention, it is possible to use an aluminum alloy extruded product having both ends of the ice making plate main body 8 having obtuse angles, but as described above, rubber, Teflon or the like is used. The method of attaching the shaped body to both ends of the ice making plate will also work sufficiently.

Next, the detection means for switching the above-mentioned ice making and de-iceing will be described with reference to FIGS. This detection means is shown in FIG.
In the lower part of the plurality of ice-making plates 8 arranged in line as shown in FIG. 2, a pair of light projectors 30 and a light receiver 31 composed of a photoelectric conversion element are provided so as to face each other, and an optical axis L of the light projector 30 is provided. Is fixedly arranged toward the light receiving surface of the light receiver 31, and when the ice a grows to a position where the ice a interferes with the optical axis in the lower part of each ice making plate 8, the light receiver 3
Utilizing the fact that the amount of received light of 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.
In the initial state of equipment operation, first the ice making cycle (step 1)
Becomes The amount of light received by the light receiver 31 is kept constant when the ice is not growing, and its output exceeds the set lower limit value. When ice a grows to a predetermined thickness d or more in the lower part of the ice making plate 8 from this state, a part of the light emitted from the projector 30 is scattered by the ice a, so that the amount of light received by the light receiver 31 decreases. 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 a has fallen, the amount of light received by the light receiver 31 is restored to the initial value again, and as a result, the set lower limit value is exceeded, and when de-icing is confirmed (step 4), this signal is received and the switching circuit automatically restarts. The ice making cycle of step 1 is repeated again by opening the valve 7a and closing the automatic valve 7b. The heat storage tank 10
When the state becomes full of ice (step 5), the operation stop processing (step 6) is performed to stop all the operations.

It should be noted that the lower end thickness d of the ice a 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 de-icing. This structure is economical because it is detected only by the pair of light emitters / receivers 30, 31 in spite of the large number of ice making plates 8.
Since the original amount of received light cannot be restored unless deicing is performed at all points, there is an advantage that no deicing mistake occurs.

In addition, the light emitters / receivers 30, 31 are
In systems where deicing is performed by a timer or other method, it can be used as a means of preventing ice blocking by detecting ice overgrowth.

Further, at the time of deicing, the sprinkling nozzles 12 provided in the sprinkling tank 9 are closed, or the sprinkling tank 9 is partitioned into blocks of the ice making plate, and the cold water supply to the portion corresponding to the block being deiced is stopped. Thus, by stopping the supply of cold water to the ice making plate 8 during deicing, it is possible to shorten the deicing time and improve the ice making efficiency.

[0055]

As described above in detail with reference to the embodiments, in the harvest type ice making device according to the invention of claim 1, since the ice making plate is made of the aluminum alloy extruded body, the liquid circulation system is adopted. It is possible to improve the heat transfer efficiency compared to the conventional direct expansion type by adopting the liquid circulation method.
It is possible to provide a compact and inexpensive harvesting type ice making device.

According to the second aspect of the invention, by forming the inner fins, the heat transfer coefficient of the refrigerant vaporization can be further increased, and by providing the header with a plurality of distribution pores, the ice making plate main body can be obtained. Refrigerant can be uniformly supplied to each refrigerant flow path in the inside, and the entire surface of the ice making plate can be effectively used. Further, by making the lower header the thickness of the ice making plate main body +10 mm or less, de-icing is performed. It can be done 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 pore-sealing agent so that the ice-making water is highly corrosive or the use environment is bad. It can be used when the corrosion resistance is poor.

According to the structure of claim 4, it is possible to prevent the generation of ice at the end portion of the ice making plate, and to perform deicing smoothly. In addition, the ice making plate forms an obtuse angle with the ice making plate, so that deicing can be performed more smoothly.

With the structure of claim 5, in the harvest type ice making device, if deicing fails, blocking of the ice occurs, so it is necessary to lengthen the deconcreting time for safety. Detects de-icing failure,
Since measures can be taken automatically, the deicing time can be minimized and the ice making efficiency can be improved.

Therefore, according to the present invention, an ice-making device for a building air-conditioning system, a cold-storage system for night-time electricity use such as district heating and cooling, or an ice-making device for refrigerating foods, fresh foods, etc. It is suitable for use in an ice making device for rapid cooling, and further as an ice making device for artificial snowfall.

[Brief description of 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.

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

FIG. 4 is a sectional view taken along line BB in FIG.

5 (a), (b) and (c) are plan views for explaining the process of defining the shape of the side plate.

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 an apparatus using the light emitting and receiving device.

[Explanation of symbols]

 1 Compressor 2 Condenser 3, 4 Expansion valve 5 Flash tank 6 Refrigerant pump 6 Refrigerator pump 8 Ice plate 9 Water sprinkling tank 10 Heat storage tank 11 Cold water pump 12 Nozzle 20 Ice plate body 20a Refrigerant flow passage 20b Inner fin 21 Upper header 22 Lower header 22a Refrigerant channel 22b Pore 23 Side plate (shaped body) 30 Emitter 31 Light receiver

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[Procedure amendment]

[Submission date] July 7, 1995

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 5

[Correction method] Change

[Correction content]

FIG. 5 is a plan view for explaining the process of defining the shape of the side plate.
It

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 7]

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Tetsuo Kataoka 3-22 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture 3-22 Kansai Electric Power Co., Inc. (72) Katsuhito Fujiwara 3--3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture No.22 in Kansai Electric Power Co., Inc. (72) Inventor Masahiko Fujise, 3-3 Nakanoshima, Kita-ku, Osaka City, Osaka Prefecture No. 22 In Kansai Electric Power Co., Inc. (72) Keizo Kadono, 4-7 Takeshima, Nishiyodogawa-ku, Osaka City, Osaka Prefecture No. 32 Sakura Corporation (72) Hiroshi Kashiwagi 4-7 Takeshima, Nishiyodogawa-ku, Osaka City, Osaka Prefecture 32 No. 32 Sakura House Co., Ltd. (72) Masahiro Adachi 4-73 Takeshima, Nishiyodogawa-ku, Osaka City, Osaka Prefecture Inside Sakura Co., Ltd. (72) Inventor Shunji Hachisuka 4-3 Kitahama East, Chuo-ku, Osaka City, Osaka Prefecture Obayashi Corporation Main Store (72) Inventor Yoshiki Kitamura Osaka Prefecture Osaka City Chuo-ku Kitahama East 4-33, Ltd. Obayashi Corporation Main Store (72) Inventor Yoshio Gomachi 4-33 Kitahama East Chuo-ku, Osaka City, Osaka Prefecture Obayashi Corporation Main Store

Claims (5)

[Claims] 1. A harvest-type ice making apparatus comprising an ice-making plate made of an aluminum alloy extruded product having a refrigerant passage formed therein, and a liquid circulation method being adopted as a refrigerant supply method to the refrigerant passage. apparatus. 2. An ice making plate main body having inner fins formed therein, wherein a plurality of refrigerant flow passages are opened along the extrusion direction and the surface area of the refrigerant flow passages is enlarged 1.1 times or more. The upper and lower headers are integrated into the upper and lower parts of the main body, and one end or both ends are connected to the refrigerant pipe and have a plurality of distribution pores communicating with the refrigerant flow path, and the lower header is the thickness of the ice making plate body. In addition to the thickness, the harvesting type ice making device according to claim 1, which is formed to have a thickness of 10 mm or less. 3. The harvest-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 harvest type according to claim 1, wherein the ice making plate main body and the lower header have at both ends thereof a shape body having an obtuse angle with respect to the ice making plate. Ice maker. 5. The ice-making plate comprises a light emitter and a light-receiver arranged to face each other below the ice-making plate, and has means for detecting that the ice generated at the lower part of the ice-making plate has a certain thickness due to a confusion state of light. The harvest type ice making device according to any one of claims 1 to 4, wherein