JP2010133628A - Chill tray evaporator and ice-making machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly efficient and economical chill tray evaporator reducing use amount of brazing filler metal disadvantageous in terms of thermal conductivity and corrosion resistance and improving heat transfer rate between ice making water and a refrigerant. <P>SOLUTION: In a connection plate 7 constituting the chill tray evaporator 1, brazing filler metal 5, 6 is not interposed in a portion with which the refrigerant R comes into contact and a portion with which ice I or the ice making water W comes into contact. Due to this configuration, a heat transfer route is shortened so as to enable improvement of the heat transfer rate from the ice making water W to the refrigerant R. As a result, ice making capacity of an ice-making machine can be enhanced and energy consumption for ice making can be reduced. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ice tray evaporator in which a refrigerant flow path is formed on the bottom surface of an ice tray and a function as a cooler is added, and an ice making apparatus including the ice tray evaporator as a cooler.

  In recent years, high-spec models and energy-saving models have also been developed in the field of commercial ice makers, and as a result, higher efficiency of cooling system related parts is required. The demand for higher efficiency is also increasing for ice tray evaporators, one of the related parts.

  On the other hand, the demand for rationalization of component materials has been increased due to soaring raw materials, and in addition to improving cooling performance, further cost reduction has been demanded.

  As an example, the movement of changing the copper and copper alloy ice tray evaporator to an aluminum alloy is also remarkable.

  Conventionally, this type of ice tray evaporator made of aluminum alloy is known (see, for example, Patent Document 1).

  8 and 9 show a conventional ice tray evaporator described in Patent Document 1.

  As shown in FIG. 8, the ice tray evaporator 30 includes an aluminum alloy refrigerant plate 31, a lattice plate 33 partitioned by an aluminum alloy lattice plate 32, and aluminum alloy brazing materials 34 and 35 on both sides. The connecting plate 36 is made of a clad aluminum alloy.

  A groove portion 37 extending in a serpentine shape is formed in the refrigerant plate 31 in advance, and a refrigerant flow path is formed by bonding the connection plate 36 together. A refrigerant inlet 38 is formed at one end of the refrigerant flow path, and a refrigerant outlet 39 is formed at the other end.

  The ice tray evaporator 30 configured as described above is disposed in an ice making machine (not shown) in a state of opening downward, and flows the refrigerant R through the refrigerant flow path and is partitioned by a lattice plate 32 from below. It is used in a state where water W is jetted toward the lattice plate 33 formed.

  In FIG. 9, the heat transfer path of the injected water W is transmitted to the grid plate 32, is conducted through the grid plate 32, and is transmitted to the brazing material 34 clad on the connection plate 36 joined to the grid plate 32. It consists of a path and a path that transmits directly to the brazing material 34 clad on the connecting plate 36 and conducts through the brazing material 34.

  Further, the heat transmitted to the brazing material 34 is transmitted to the connection plate 36, is conducted in the connection plate 36, is transmitted to the brazing material 35 clad on the back surface of the connection plate 36, and is conducted in the brazing material 35. Next, the heat transmitted to the brazing material 35 is divided into a path for direct transmission to the refrigerant, and a path for transmission from the brazing material 35 to the refrigerant plate 31, conduction through the refrigerant plate 31 and transmission to the refrigerant R. However, the heat transfer path with the highest heat flux is selected as a path for direct transmission to the brazing material 34 clad on the connecting plate 36 and for conduction through the brazing material 34 and a path for direct transmission from the brazing material 35 to the refrigerant. . And the heat of the water W is deprived and the refrigerant | coolant R which flows through a refrigerant | coolant flow path evaporates sequentially.

  Due to the continuous heat transfer, the water W is frozen and ice I is formed in the lattice dish 33.

  In addition, when a brazed sheet is referred to as a brazing sheet, a brazing material is referred to as a skin material, and a plate material is referred to as a core material, a general brazing sheet uses an alloy in the 4000 series defined by the aluminum alloy standard. The core material uses an alloy in the 3000 series defined by the aluminum alloy standard.

In addition, considering the workability, weldability, and corrosion resistance, the refrigerant plate 31 and the lattice plate 32 are in the 1000s or 3000s defined by the aluminum alloy standards. Therefore, the conventional configuration has a low structural strength and requires an appropriate thickness.
Japanese Patent Laid-Open No. 54-024350

  However, in the conventional configuration described above, there are many factors for reducing the heat transfer coefficient due to the large number of paths for heat conduction and heat transfer and the presence of the brazing materials 34 and 35 having a relatively low heat conductivity. Due to the existence, it has been difficult to improve the ice making capacity of the ice making machine.

  Further, the brazing material 34 clad on the connection plate 36 is in direct contact with the fountain, but it is difficult to uniformly form an oxide film by a relatively cheap alumite treatment or boehmite treatment as a corrosion-resistant surface treatment of aluminum. There were drawbacks. Therefore, in order to make it difficult to lower the corrosion resistance, an oxide film having a lower thermal conductivity than necessary is formed on the surface, and it is therefore difficult to improve the ice making capacity of the ice making machine.

  Therefore, even in the ice making machine using the ice tray evaporator 30, it takes time to obtain a predetermined amount of ice making, and it is difficult to reduce power consumption.

  The present invention solves the above-mentioned conventional problems, and even when the shape and size of the generated ice is maintained, the structure / pressure strength is ensured and the heat transfer coefficient between water and the refrigerant is improved. It is an object of the present invention to provide an efficient and economical ice tray evaporator, and in an ice making device using the ice tray evaporator, it is possible to reduce energy consumption such as electric power required for ice making.

  In order to solve the above-described conventional problems, an ice tray evaporator according to the present invention includes a refrigerant plate having a refrigerant channel, a lattice plate in which a plurality of ice making spaces are formed in a lattice shape, the refrigerant plate, and the lattice plate. In the brazing configuration of the sandwiched connection plate, at least the refrigerant flowing through the refrigerant flow path is the shortest in which the brazing material does not intervene in either the portion in contact with the connection plate or the portion in which the ice-making water contacts the connection plate A heat transfer portion is provided.

  As a result, the heat transfer path can be shortened because heat transfer of the coolant and ice-making water can be performed through the shortest heat transfer portion of the connection plate where the brazing filler metal layer is not formed on the connection plate, which is the heat transfer path with the highest heat flux. As a result, the heat transfer rate from the ice-making water to the refrigerant is improved, and an ice-making tray evaporator having high ice-making ability can be obtained.

  Further, the ice making device of the present invention can increase the ice making capacity by shortening the ice making time by incorporating the ice making plate evaporator into the refrigeration cycle, thereby reducing the energy consumption.

  The ice tray evaporator according to the present invention can improve the heat transfer rate between the water for ice making and the refrigerant by using an inexpensive configuration, and the time required for ice making can be shortened. Moreover, in the ice making device using such an ice tray evaporator, it is possible to shorten the operation time required for ice making and to save energy.

  The invention according to claim 1 is a metal refrigerant plate having a refrigerant flow path through which refrigerant flows, a metal lattice plate in which a plurality of ice making spaces in contact with ice making water are formed in a lattice shape, and the refrigerant plate And an ice tray evaporator brazed with the metal connection plate sandwiched between the lattice plates, and at least a portion where the refrigerant contacts the connection plate, or a portion where the ice-making water contacts the connection plate Either one is provided with the shortest heat transfer portion where the brazing material is not interposed.

  By adopting such a configuration, the heat transfer path can be shortened because the heat of the refrigerant or the water for ice making can be transmitted to the connection plate, which is the heat transfer path having the highest heat flux, without the brazing material. As a result, the heat transfer rate from the ice making water to the refrigerant is improved, and the ice making capacity of the ice tray evaporator can be increased.

  According to a second aspect of the present invention, in the first aspect of the present invention, the brazing material is applied only to the contact portion between the refrigerant plate and the connection plate, or the brazing material is applied only to the contact portion between the lattice plate and the connection plate. By interposing it, the shortest heat transfer portion is configured.

  By adopting such a configuration, there is no melting of the brazing material at an unnecessary portion, wasteful consumption of the brazing material can be eliminated, and the material cost can be reduced.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the coolant plate is provided with a groove portion that forms the coolant channel by contact with the connection plate, and the brazing material is By forming a thin film sheet, and cutting the sheet-shaped brazing material into a shape of a contact surface between the refrigerant plate and the connection plate or a shape of a contact surface between the lattice plate and the connection plate The shortest heat transfer portion is formed.

  By adopting such a configuration, there is no melting of the brazing material in unnecessary portions, and unnecessary consumption of the brazing material can be eliminated. In addition, the brazing material in the cut-off portion can be recycled and reused, and the material cost is reduced. Further reduction is possible.

  According to a fourth aspect of the present invention, in the invention according to any one of the first to third aspects, the contact surface shape of the refrigerant plate and the connection plate is formed on one of the refrigerant plate and the connection plate. By applying a paste-like brazing material and applying a paste-like brazing material to the contact surface shape of the lattice plate and the connection plate on one of the lattice plate and the connection plate, the shortest heat transfer portion Is formed.

  By adopting such a configuration, it is possible to reduce the cost including the processing cost because the brazing material sheet is not cut off or recycled.

  The invention according to claim 5 is the invention according to any one of claims 1 to 4, wherein the flux treatment is applied only to the portion where the brazing material is interposed.

  By setting it as this structure, the application quantity of the flux which removes the oxide film on the aluminum surface can be reduced, and the cost of the auxiliary material used for brazing can be reduced.

  The invention according to claim 6 is the invention according to claim 1 or 2, wherein the connection plate is constituted by a brazing sheet clad with the brazing material.

  As a result, there is no melting of the brazing material at unnecessary locations, wasteful consumption of the brazing material can be eliminated, and the material cost can be reduced. The number of parts involved can be reduced, and parts management can be simplified and facilitated.

  A seventh aspect of the present invention is the invention according to any one of the first to sixth aspects, wherein the refrigerant plate, the connecting plate, and the lattice plate are made of pure aluminum in the 1000s defined by an aluminum alloy standard. It is made.

  As a result, a material having the highest thermal conductivity among aluminum is used for the ice tray evaporator, and the overall heat transfer rate from the ice making water to the refrigerant of the ice tray evaporator is improved, thereby improving the ice making capacity. it can. Moreover, recyclability can be improved by increasing the aluminum purity of the ice tray evaporator body.

  The invention described in claim 8 is a refrigeration cycle in which an ice tray evaporator accompanied by a compressor, a condenser, a pressure reducing device, and an evaporator function is connected in a ring shape through a pipe, and ice-making water is supplied to the ice tray evaporator. The ice making device provided with a water supply device, wherein the ice tray evaporator is the ice tray evaporator according to any one of claims 1 to 7.

  Since such an ice making device forms a shortened path in the heat transfer path of the ice tray evaporator without using a brazing material, ice making can be performed with high ice making capacity. Therefore, the operation time required for ice making can be shortened, and energy consumption can be reduced and ice making can be performed.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a perspective view of an ice tray evaporator according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the ice tray evaporator before assembly. FIG. 3 is a cross-sectional view of a main part for explaining the heat transfer state of the ice tray evaporator. FIG. 4 is a plan view of the lattice dish side showing a different structure of the connection plate constituting the ice tray evaporator. FIG. 5 is a plan view of the connection plate on the refrigerant plate side.

  1 and 2, the ice tray evaporator 1 is partitioned by an aluminum alloy refrigerant plate 2 and an aluminum alloy lattice plate 3 on which a plurality of ices I are formed, and has ice making spaces 4a in a lattice shape. It is composed of a lattice plate 4, an aluminum alloy connecting plate 7 sandwiched between the refrigerant plate 2 and the lattice plate 4 and joined by brazing materials 5 and 6 made of aluminum alloy.

  In addition, a groove 8 a extending in a serpentine shape is formed in the refrigerant plate 2 in advance by a mold forming process or the like, and the refrigerant flow path 8 is formed by bonding the connection plate 7. Therefore, one end of the refrigerant flow path 8 becomes the refrigerant inlet 9 and the other end becomes the refrigerant outlet 10.

  The coolant plate 2 and the lattice plate 3 are made of aluminum alloys in the 1000s or 3000s defined by the aluminum alloy standards, and the brazing materials 5 and 6 are 4000 defined by the aluminum alloy standards. A series aluminum alloy is used, and the connecting plate 7 is made of a 3000 series aluminum alloy defined by the aluminum alloy standard.

  Further, as shown in FIG. 2, the brazing material 5 interposed between the connection plate 7 and the lattice dish 4 is formed in a thin sheet shape. A cut-out portion 5a that is cut off so as to be in contact with only the end face that forms the lattice of the plate 3 is provided.

  Further, the brazing material 6 interposed between the connection plate 7 and the refrigerant plate 2 is also formed in a thin sheet shape, and in a portion corresponding to the groove 8 (space) formed in the refrigerant plate 2. The cut-out portion 6a is provided by cutting-off processing.

  In other words, the brazing material 5 is processed into the same shape as the surface where the lattice plate 4 including the lattice plate 3 and the connection plate 7 contact, and the brazing material 6 is processed into the same shape as the surface where the refrigerant plate 2 and the connection plate 7 contact. Has been.

  In the above configuration, the ice tray evaporator 1 is assembled as shown in FIG. It is completed by integrating the refrigerant plate 2, the connection plate 7, and the grid plate 4 through the brazing materials 5 and 6 using appropriate means such as heating inside. If necessary, pipes 11 and 12 for connecting a refrigeration cycle pipe may be attached to the refrigerant inlet 9 and the refrigerant outlet 10 as shown in FIG.

  Therefore, the space 4 a formed by the lattice dish 4 is in a state surrounded by the portion directly facing the connection plate 7 and the portion facing the lattice plate 3.

  In the ice tray evaporator 1 configured as described above, ice making and heat transfer in which ice is generated will be described with reference to FIG.

  In generating ice, the ice tray evaporator 1 according to the first embodiment is arranged in a state where the ice making space 4a is opened downward, as in the prior art, and in that state, the water is directed toward the respective ice making spaces 4a from below. (Equivalent to the ice making water of the present invention) W is jetted. And the low-temperature refrigerant | coolant R has flowed through the refrigerant | coolant flow path 8, and the water W injected into the ice making space 4a is heat-exchanged with the refrigerant | coolant R, and becomes film-form ice, and gradually passes over time. The thickness increases, grows and fills the ice making space 4a, and the ice generation process is completed.

  In the ice generation process described above, the heat transfer of the water W is transmitted to the lattice plate 3, is conducted through the lattice plate 3, and is transmitted to the brazing material 5 joining the lattice plate 3 and the connection plate 7. A path B that is transmitted to the connection plate 7 and is conducted through the connection plate 7 to exchange heat with the refrigerant R; a path C that is conducted through the connection plate 7 and is transmitted to the brazing material 6 side; and the brazing material 6 is transmitted to the refrigerant plate 2 and conducted through a path D through which heat is exchanged with the refrigerant through the refrigerant plate 2.

  In the heat transfer paths A to D, unlike the conventional path, the path B is a path in which the heat of the ice I or the water W is directly transferred to the connection plate 7 and is conducted through the connection plate 7 to directly exchange heat with the refrigerant R. It has become. In other words, the path B is in a state where the length of the heat transfer path is shortened because the brazing materials 5 and 6 are not interposed between the portion where the refrigerant R contacts and the portion where the ice I or the water W contacts. This constitutes the shortest heat transfer part.

  In addition, as the brazing materials 5 and 6, an aluminum alloy in the 4000 series generally defined by the aluminum alloy standard is adopted, and the thermal conductivity λ of this material is about 160 [W / m · ° C.], and the aluminum alloy standard 1000 The thermal conductivity λ1 (230 [W / m · ° C.]) of the material in the range and the thermal conductivity λ 2 (190 [W / m · ° C.]) of the material in the aluminum alloy standard 3000 range are Low and heat exchange efficiency is poor.

  Therefore, the formation of the heat transfer path B can secure a heat transfer path that eliminates the intervention of the brazing filler metals 5 and 6 having a relatively low thermal conductivity λ, and eliminates the inclusion of the brazing filler metals 5 and 6. As a result, the length of the heat transfer path can be shortened. As a result, the heat transfer rate from the water W to the refrigerant R can be improved, and the ice making capacity (ice making capacity) of the ice tray evaporator 1 can be increased. .

  In addition, the heat transfer coefficient from the water W to the refrigerant R can be further improved by adopting a pure aluminum material of the aluminum alloy standard 1000 series for all of the refrigerant plate 2, the lattice plate 3, and the connection plate 7. The ice making capacity of the ice tray evaporator 1 can be further increased.

  Further, since the brazing members 5 and 6 are provided with the hollow portions 5a and 6a so as to be interposed only in the contact surfaces necessary for brazing the refrigerant plate 2, the connection plate 7, and the lattice plate 4, the refrigerant plate 2, the connection plate 7, The brazing of the lattice tray 4 is not wasted, the amount of material used for brazing can be reduced, and in addition, the brazing materials 5 and 6 deleted as the hollow portions 5a and 6a can be reused. As a result, cost can be reduced.

  Furthermore, since the flux for removing the oxide film on the aluminum surface is applied only to the portions necessary for brazing, the amount of flux to be used can be reduced.

  Therefore, the cost of the auxiliary material can be reduced.

  Further, the configuration excluding the connection plate 7 and the brazing materials 5 and 6 is the same as that shown in FIG. 1, and the connection plate 7, as shown in FIGS. A brazing sheet 7a in which the brazing materials 5 and 6 are clad only at the portions where the lattice plate 3 and the lattice plate 4 come into contact with each other can also be used. In such a case, the number of parts can be reduced.

  In view of a slight decrease in ice making efficiency, only one of the brazing materials 5 and 6 is provided with the hollow portions 5a and 6a, and the other is brazed as a sheet-like brazing material having no hollow portion. Similarly, when assembled, the shortest heat transfer portion can be formed. Similarly, in the configurations of FIGS. 4 and 5, either one may be configured to be clad with a one-side brazing material.

  Further, in the first embodiment, the case where the ice generation by the ice tray evaporator 1 is performed while spraying the water W into the ice making space 4a has been described as an example, but the water W is injected into the ice making space 4a in advance. The present invention can also be applied to a type in which ice making is performed by the heat of the refrigerant R flowing through the refrigerant flow path 8 of the refrigerant plate 2.

  Further, in the ice tray evaporator 1, the refrigerant plate 2, the lattice plate 3, the lattice plate 4, and the connection plate 7 are made of an aluminum alloy. However, even if any of these is made of a similar metal, It can be configured in the same manner, and the same effect can be expected.

(Embodiment 2)
FIG. 6 is an exploded perspective view of the ice tray evaporator according to the second embodiment of the present invention before assembly. Note that the same constituent elements as those in the first embodiment are denoted by the same reference numerals, and here, differences from the first embodiment will be mainly described.

  In FIG. 6, the configuration different from that of the first embodiment uses a paste-like brazing material 13 used for assembling the ice tray evaporator 1, and in the plane portion excluding the groove 8 a of the refrigerant plate 2 and the connection plate 7, A paste-like brazing material 13 is applied to the outer end surface of the lattice plate 4 that contacts the connection plate 7 and the end surface portion of the lattice plate 3 that forms the lattice, and brazing assembly is performed with the connection plate 7 sandwiched therebetween. is doing. In addition, at the time of this assembly, a paste-like flux (not shown) can be applied in advance to a place where the brazing filler metal 13 is applied in advance.

  Assembling the ice tray evaporator 1 configured as described above is similar to the first embodiment, in which the refrigerant plate 2, the connection plate 7 and the lattice plate 4 each coated with the brazing material 13 are stacked in layers and filled with nitrogen gas. By heating in the furnace, the refrigerant plate 2, the connection plate 7, and the lattice dish 4 can be integrated via the brazing material 13.

  Then, the ice tray evaporator 1 is arranged with the ice making space 4a opened downward, and in that state, water W is jetted from below toward each ice making space 4a as in the first embodiment. Ice making is generated.

  Even in such a configuration, as in the first embodiment, in the heat transfer path between the water W and the refrigerant R, a path in which the brazing filler metal 13 is not interposed, that is, the path B in the first embodiment via the connection plate 7 is equivalent. Therefore, the heat transfer rate from the water W to the refrigerant R can be improved, and the ice tray evaporator 1 having a high ice making capacity can be obtained.

  Further, since the paste-like brazing material 13 is interposed only on the contact surfaces necessary for brazing the refrigerant plate 2, the connection plate 7, and the grid plate 4, and the flux treatment is performed on the necessary contact surface, the refrigerant There is no waste in brazing the plate 2, the connection plate 7, and the lattice tray 4, the amount of material used for brazing can be reduced, and the cost of secondary materials can be reduced.

  Further, since the brazing material 13 is in the form of a paste, the workability can be improved because it is not accompanied by the drilling (cutting) process that is essential for the sheet-like brazing material.

  In the brazing of the refrigerant plate 2, the connecting plate 7, and the grid plate 4, the paste-like brazing material 13 is interposed only on one of the contact surfaces, and the remaining one is the drilling described in the first embodiment. It can also be set as the structure brazed using the sheet-like brazing material which comprises a part.

  In addition, in anticipation of a slight decrease in ice making efficiency, in the brazing of the refrigerant plate 2, the connection plate 7, and the lattice dish 4, the paste-like brazing material 13 is applied only to one of the contact surfaces, and the remaining one is As in the prior art, the connecting plate 7 can be brazed with a brazing material clad on one side.

  Furthermore, in the second embodiment, an example has been described in which ice generation by the ice tray evaporator 1 is performed while water W is jetted into the ice making space 4a. However, the water W is injected into the ice making space 4a in advance. The present invention can also be applied to a type in which ice making is performed by the heat of the refrigerant R flowing through the refrigerant flow path 8 of the refrigerant plate 2.

  Further, in the ice tray evaporator 1, the refrigerant plate 2, the lattice plate 3, the lattice plate 4, and the connection plate 7 are made of an aluminum alloy. However, even if any of these is made of a similar metal, It can be configured in the same manner, and the same effect can be expected.

(Embodiment 3)
FIG. 7 is a schematic diagram showing a system configuration of an ice making device provided with the ice tray evaporator according to Embodiment 3 of the present invention.

  In FIG. 7, an ice making device 21 includes a refrigeration cycle in which a compressor 22, a condenser 23, a decompression device 24, and the ice making plate evaporator 1 described in the first or second embodiment are connected in a ring shape via a pipe. Yes.

  Further, the ice making device 21 includes an injection device (corresponding to a water supply device of the present invention) 25 having a number of nozzles 25a corresponding to an ice making space (not shown) of the ice making evaporator 1. The water W is supplied from a water supply source (not shown) such as a water pipe through the pipe 26, and the water W is jetted from the nozzle 25a.

  The generation of ice by the ice making device 21 described above is performed as follows.

  As shown in FIG. 3, the ice tray evaporator 1 is arranged with its ice making space opened downward, and each nozzle 25 a of the injection device 25 is positioned to face each ice making space.

  Then, the compressor 22 is operated and the refrigerant circulates, whereby the ice tray evaporator 1 is cooled according to a known principle.

  On the other hand, as the injection device 25 is operated and water W is injected into each ice making space from each nozzle 25a, heat exchange with the refrigerant in the ice making space proceeds, the water freezes, and the ice layer gradually thickens. And ice is produced.

  In this ice making process, as described in the first and second embodiments, the ice tray evaporator 1 forms a shortened path in the heat transfer path without using the brazing material, and thus has a high ice making capacity. Make ice with.

  Therefore, the ice making device 21 can perform ice making in which the operation time required for ice making is shortened and energy consumption is reduced.

  As described above, the ice tray evaporator of the present invention can improve the ice making capacity by improving the heat transfer rate from water or ice to the refrigerant, thereby saving energy and shortening the ice making time. It can be widely applied to such as.

The perspective view of the ice tray evaporator in Embodiment 1 of this invention An exploded perspective view of the ice tray evaporator before assembly Sectional drawing of the principal part explaining the heat transfer state of the ice tray evaporator A plan view of the lattice dish side showing a different structure of the connecting plate constituting the ice tray evaporator Plan view on the refrigerant plate side of the connection plate The exploded perspective view before the assembly of the ice tray evaporator in Embodiment 2 of this invention The schematic diagram which shows the system configuration | structure of the ice making apparatus which comprised the ice tray evaporator in Embodiment 3 of this invention. Perspective view of ice tray evaporator showing conventional example Sectional view of the main part of the ice tray evaporator

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Ice tray evaporator 2 Refrigerant plate 3 Lattice plate 4a Ice making space 4 Lattice plate 5 Brazing material 5a Drilling part 6 Brazing material 6a Drilling part 7 Connection plate 7a Brazing sheet 8 Refrigerant flow path 8a Groove part 13 Brazing material 21 Ice making apparatus 22 Compressor 23 Condenser 24 Pressure reducing device 25 Injection device (water supply device)
B path (shortest heat transfer part)
I ice R refrigerant W water (ice making water)

Claims (8)

  A metal refrigerant plate having a refrigerant flow path through which refrigerant flows, a metal lattice plate in which a plurality of ice making spaces in contact with ice making water are formed in a lattice shape, and a metal sandwiched between the refrigerant plate and the lattice plate In an ice tray evaporator having a connecting plate made of solder and brazing them, the brazing material is at least one of a portion where the refrigerant contacts the connecting plate or a portion where the ice-making water contacts the connecting plate. Ice tray evaporator with the shortest heat transfer part that does not intervene.   2. The shortest heat transfer portion is configured by interposing a brazing material only in a contact portion between the refrigerant plate and the connection plate or by interposing a brazing material only in a contact portion between the lattice plate and the connection plate. Ice tray evaporator.   The coolant plate is provided with a groove portion that forms the coolant flow path by contact with the connection plate, and the brazing material is formed into a thin film sheet, and the sheet-like brazing material is connected to the coolant plate and the connection. The ice tray evaporator according to claim 1 or 2, wherein the shortest heat transfer portion is formed by performing a cutting process so as to have a shape of a contact surface of a plate or a shape of a contact surface of the lattice plate and the connection plate. .   A paste-like brazing material is applied to one of the refrigerant plate and the connection plate on the contact surface of the refrigerant plate and the connection plate, and the lattice plate is applied to either the lattice plate or the connection plate. The ice tray evaporator according to any one of claims 1 to 3, wherein the shortest heat transfer portion is formed by applying a paste-like brazing material to a contact surface shape of the connection plate.   The ice tray evaporator as described in any one of Claim 1 to 4 which performed the flux process only to the location where the said brazing material interposes.   The ice tray evaporator according to claim 1 or 2, wherein the connection plate is composed of a brazing sheet clad with the brazing material.   The ice tray evaporator according to any one of claims 1 to 6, wherein the refrigerant plate, the connection plate, and the lattice tray are made of pure aluminum of 1000 series defined by an aluminum alloy standard.   In an ice making apparatus equipped with a compressor, a condenser, a decompression device, a refrigeration cycle in which an ice tray evaporator with an evaporator action is connected in a ring shape through a pipe, and a water supply device for supplying ice making water to the ice tray evaporator, An ice making device, wherein the ice tray evaporator is the ice tray evaporator according to any one of claims 1 to 7.