JP2012047414A - Auger type ice-making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stably produce ices by uniformly cooling an entire cooling cylinder even if a refrigerant having a temperature glide is used.SOLUTION: The auger type ice-making machine IM continuously produces ice chips by shaving off ices produced on the inner wall of the cooling cylinder 15 by the rotary blade 16 of an auger 14, and transferring them upward and compressing the shaved-off ices. The auger type ice-making machine includes a compressor 3, a condenser 4, an expansion valve 5, and an evaporation pipe 2, and is filled with a non-azeotropic refrigerant mixture. The evaporation pipe 2 is spirally wound in a flattened state around the outer wall of the cooling cylinder 15. The flattening of the evaporation pipe 2 is set higher as it goes to the refrigerant outlet 2B of the evaporation pipe 2.

Description

  The present invention relates to an auger type ice making machine including a compressor, a condenser, a decompression device, and an evaporation pipe, and a refrigeration device filled with a non-azeotropic refrigerant mixture.

  Conventionally, this type of auger type ice making machine inserts an auger into a cooling cylinder having a cooling device evaporator (evaporation pipe) attached to the outer periphery, and supplies ice-making water from the bottom into the cooling cylinder. The ice grown on the inner surface of the steel is scraped with a rotating auger blade and sent upward (scraped up), compressed by an upper bearing for ice compression molding attached to the top of the cooling cylinder, and the ice pieces are continuously Is to be generated.

  The evaporation pipe constitutes a refrigeration cycle together with a compressor, a condenser, a decompression device, etc., and the refrigerant compressed by the compressor is condensed by the condenser and decompressed by the decompression device, and then the refrigerant is evaporated by the evaporation pipe. At this time, the water in the cooling cylinder is cooled by the evaporation of the refrigerant. At this time, the lower side of the evaporation pipe wound around the outer wall of the cooling cylinder is a refrigerant inlet, and the upper side is a refrigerant outlet. Then, the ice-making water supplied from the lower part of the cooling cylinder is cooled by the refrigerant flowing through the evaporation pipe, and the ice moving from the bottom to the top is gradually cooled and hardened to perform ice making.

  Here, when a refrigerant having a small or no temperature glide such as the pseudo-azeotropic mixed refrigerant R404A or the single component refrigerant R134a is used as the refrigerant, the evaporating temperature of the refrigerant in the evaporating pipe is constant. If is not completed, the temperature difference between the refrigerant inlet side and the refrigerant outlet side is small.

  On the other hand, in recent years, various types of non-azeotropic refrigerant mixtures have been developed, and there are refrigerants that are excellent in performance and refrigerants that have a low environmental load (see, for example, Patent Document 1).

JP 2010-60159 A

  However, non-azeotropic refrigerants such as those mentioned above have different dew points and boiling points of the constituent components in the course of evaporation and condensation, so even if evaporation has not been completed on the evaporation pipe outlet side, the temperature on the inlet side of the evaporation pipe In comparison, the temperature on the outlet side may be 5 to 15 degrees higher.

  Therefore, the lower side in the cooling cylinder grows faster, the upper side grows slower, and the generated ice becomes inhomogeneous. The ice produced in the fast-growing part has a higher hardness than the others, and the scraping load in the part is increased, which causes a problem of eccentricity of the rotating shaft that rotates the auger.

  The present invention has been made to solve the conventional technical problems, and even when a refrigerant having a temperature glide is used, the entire cooling cylinder is uniformly cooled to realize stable ice making. Provide an auger type ice maker.

  The auger type ice making machine of the invention of claim 1 comprises a cooling cylinder having an evaporation pipe provided on an outer wall thereof, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger. The ice produced on the inner wall of the cooling cylinder is scraped off by an auger, and transferred upward and compressed to produce ice pieces continuously, comprising a compressor, a condenser, a decompression means, and A refrigerant circuit is configured from the evaporation pipe and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture. The evaporation pipe is spirally wound around the outer wall of the cooling cylinder in a flat state. The rate is increased as it approaches the refrigerant outlet of the evaporation pipe.

  An auger type ice making machine according to a second aspect of the present invention comprises: a cooling cylinder having an evaporation pipe provided on an outer wall; an auger inserted concentrically and rotatably in the cooling cylinder; and an auger motor for rotationally driving the auger. The ice produced on the inner wall of the cooling cylinder is scraped off by an auger, and transferred upward and compressed to produce ice pieces continuously, comprising a compressor, a condenser, a decompression means, and The evaporative pipe is provided with a refrigeration system that is composed of a refrigerant circuit and is filled with a non-azeotropic refrigerant mixture. The evaporative pipe is spirally wound around the outer wall of the cooling cylinder, and solder is placed in the gap between the cooling cylinder and the evaporative pipe. Is injected, and the amount of the solder injected is increased toward the refrigerant outlet of the evaporation pipe.

  An auger type ice making machine according to a third aspect of the present invention comprises a cooling cylinder having an evaporation pipe provided on an outer wall, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger. The ice produced on the inner wall of the cooling cylinder is scraped off by an auger, and transferred upward and compressed to produce ice pieces continuously, comprising a compressor, a condenser, a decompression means, and A refrigerant circuit is constructed from the evaporation pipe and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture. The evaporation pipe is spirally wound around the outer wall of the cooling cylinder, and a heat insulating material is provided outside the cooling cylinder. At the same time, the thickness dimension of the heat insulating material is increased as it approaches the refrigerant outlet of the evaporation pipe.

  An auger type ice making machine according to a fourth aspect of the present invention comprises: a cooling cylinder having an evaporation pipe on an outer wall; an auger inserted concentrically and rotatably in the cooling cylinder; and an auger motor for rotationally driving the auger. The ice produced on the inner wall of the cooling cylinder is scraped off by an auger, and transferred upward and compressed to produce ice pieces continuously, comprising a compressor, a condenser, a decompression means, and A refrigerant circuit is configured from the evaporation pipe and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture.The evaporation pipe is spirally wound around the outer wall of the cooling cylinder, and the gap between the cooling cylinder and the auger is It is characterized by being made small as it approaches the refrigerant outlet of the evaporation pipe.

  An auger type ice making machine according to a fifth aspect of the present invention comprises a cooling cylinder having an outer wall provided with an evaporation pipe, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger. The ice produced on the inner wall of the cooling cylinder is scraped off by an auger, and transferred upward and compressed to produce ice pieces continuously, comprising a compressor, a condenser, a decompression means, and The evaporative pipe is provided with a refrigeration system that is composed of a refrigerant circuit and filled with a non-azeotropic refrigerant mixture. The evaporative pipe is spirally wound around the outer wall of the cooling cylinder and is formed on the outer surface of the auger. The pitch of the blade is characterized by being made smaller as it approaches the refrigerant outlet of the evaporation pipe.

  According to a sixth aspect of the present invention, in the above inventions, the refrigerant inlet of the evaporating pipe is arranged at the lower part of the cooling cylinder and the refrigerant outlet is arranged at the upper part, the flatness of the evaporating pipe is changed, the amount of solder injected is changed, the heat insulating material The change of the thickness dimension of the above, the change of the gap between the cooling cylinder and the auger, or the change of the pitch of the blade of the auger is performed in an area excluding the lower part of the cooling cylinder.

  According to the invention of claim 1, in the auger type ice making machine provided with the refrigeration apparatus filled with the non-azeotropic mixed refrigerant, the evaporation pipe constituting the refrigeration apparatus is spirally formed on the outer wall of the cooling cylinder in a flat state. In addition, the flatness of the evaporation pipe is increased toward the refrigerant outlet of the evaporation pipe, so that the refrigerant having a low boiling point evaporates first on the refrigerant inlet side, and the refrigerant gradually evaporates. On the refrigerant outlet side, the refrigerant having a high boiling point evaporates, so that the temperature tends to increase as it goes from the refrigerant inlet side to the refrigerant outlet side. Since the flatness of the pipe is increased, it is possible to increase the cooling efficiency of the cooling cylinder of the evaporation pipe as it gets closer to the refrigerant outlet while reducing the pressure loss of the refrigerant flow on the refrigerant inlet side. , It is possible to uniformly cool the entire cooling cylinder.

  Therefore, the generated ice can be made homogeneous by eliminating the cooling unevenness in the cooling cylinder. Stable ice making can be realized by eliminating an increase in the scraping load at a specific location.

  According to the invention of claim 2, in the auger type ice making machine provided with the refrigeration apparatus filled with the non-azeotropic refrigerant mixture, the evaporation pipe constituting the refrigeration apparatus is spirally wound around the outer wall of the cooling cylinder. In addition, solder is injected into the gap between the cooling cylinder and the evaporation pipe, and the amount of the solder injected increases as it approaches the refrigerant outlet of the evaporation pipe. The refrigerant gradually evaporates, and on the refrigerant outlet side, the refrigerant having a high boiling point evaporates, so that the temperature tends to increase as it goes from the refrigerant inlet side to the refrigerant outlet side. Since the amount of solder injected into the gap between the cooling cylinder and the evaporation pipe increases as it approaches the refrigerant outlet of the evaporation pipe, the connection between the evaporation pipe and the cooling cylinder and the heat conduction performance increase as the refrigerant outlet approaches Can It is possible to uniformly cool the entire 却円 tube.

  Therefore, the generated ice can be made homogeneous by eliminating the cooling unevenness in the cooling cylinder. Stable ice making can be realized by eliminating an increase in the scraping load at a specific location.

  According to the invention of claim 3, in the auger type ice making machine provided with the refrigeration apparatus filled with the non-azeotropic refrigerant mixture, the evaporation pipe constituting the refrigeration apparatus is spirally wound around the outer wall of the cooling cylinder, A heat insulating material is provided outside the cooling cylinder, and the thickness dimension of the heat insulating material is increased toward the refrigerant outlet of the evaporation pipe, so that the refrigerant having a low boiling point evaporates first on the refrigerant inlet side, The refrigerant gradually evaporates, and on the refrigerant outlet side, the refrigerant having a high boiling point evaporates, and the temperature tends to increase as it goes from the refrigerant inlet side to the refrigerant outlet side. Since the thickness dimension of the heat insulating material that covers the outside of the cooling cylinder is increased as it approaches the refrigerant outlet, the heat insulation efficiency can be increased as the refrigerant outlet is approached, thereby uniformly cooling the entire cooling cylinder. Possible That.

  Therefore, the entire cooling cylinder can be cooled uniformly, and the generated ice can be made homogeneous. Stable ice making can be realized by eliminating an increase in the scraping load at a specific location.

  According to the invention of claim 4, in the auger type ice making machine provided with the refrigeration apparatus filled with the non-azeotropic refrigerant mixture, the evaporation pipe constituting the refrigeration apparatus is spirally wound around the outer wall of the cooling cylinder. At the same time, the gap between the cooling cylinder and the auger is made smaller toward the refrigerant outlet of the evaporation pipe, so that the refrigerant having a low boiling point evaporates first on the refrigerant inlet side, and the refrigerant gradually evaporates. On the side, as the refrigerant with a high boiling point evaporates, more ice tends to grow on the refrigerant inlet side as compared to the refrigerant outlet side. By reducing the gap between the augers, the amount of ice scraped over the entire cooling cylinder can be made uniform. Thereby, stable ice making can be realized.

  According to the invention of claim 5, in the auger type ice making machine including the refrigeration apparatus filled with the non-azeotropic refrigerant mixture, the evaporation pipe constituting the refrigeration apparatus is spirally wound around the outer wall of the cooling cylinder. At the same time, the pitch of the spiral blade formed on the outer surface of the auger is made smaller as it approaches the refrigerant outlet of the evaporation pipe, so that the refrigerant having a low boiling point evaporates first on the refrigerant inlet side, and the refrigerant gradually evaporates. On the refrigerant outlet side, the refrigerant having a high boiling point evaporates, so that more ice tends to grow on the refrigerant inlet side than on the refrigerant outlet side. Since the pitch of the spiral blade is made smaller as it approaches the refrigerant outlet of the evaporation pipe, the amount of ice scraping in the entire cooling cylinder can be made uniform. Thereby, stable ice making can be realized.

  According to the invention of claim 6, in each of the above inventions, the refrigerant inlet of the evaporation pipe is arranged at the lower part of the cooling cylinder and the refrigerant outlet is at the upper part, and the change of the flatness of the evaporation pipe, the change of the injection amount of solder, Changing the thickness of the insulation, changing the gap between the cooling cylinder and the auger, or changing the pitch of the auger blade is done in the area except for the lower part of the cooling cylinder. Except for the lower part of the cooling cylinder where there is a large amount of ice, it is possible to realize more effective and stable ice making by making each change in a region where ice growth with little liquid occurs.

It is a schematic block diagram of the auger type ice making machine to which the freezing apparatus of this invention is applied. Example 1 It is the schematic of the state by which the evaporation pipe was wound around the cooling cylinder. Example 1 It is the schematic of the state by which the evaporation pipe was wound around the cooling cylinder. (Example 2) It is a partial expanded sectional view of the cooling cylinder of the state by which the evaporation pipe was wound. (Example 3) It is a partial expanded sectional view of the cooling cylinder of the state by which the evaporation pipe was wound. Example 4 It is the schematic of the cooling cylinder of the state coat | covered with the heat insulating material. (Example 5) It is a partial expanded sectional view of the cooling cylinder of the state by which the evaporation pipe was wound. (Example 6) It is a partial expanded sectional view of the cooling cylinder of the state by which the evaporation pipe was wound. (Example 7)

  The auger type ice making machine IM of the present invention will be described below with reference to the schematic configuration diagram of FIG. The auger type ice making machine IM includes an evaporating pipe 2 for generating ice from ice making water, a compressor 3 constituting a refrigerant circuit 6 together with the evaporating pipe 2, a condenser 4, and an expansion valve 5 serving as a pressure reducing means. Are connected in order to constitute a refrigeration apparatus R. Reference numeral 7 denotes a condensing fan for air-cooling the condenser 4.

  The refrigerant circuit 6 is filled with a non-azeotropic refrigerant mixture such as R407A, R407B, and R407C. Since this non-azeotropic refrigerant mixture is generally composed of a plurality of types of refrigerants, the vaporization or liquefaction temperature is different, and the dew point and boiling point of the constituent components are different in the evaporation and condensation processes, and thus there is a temperature glide. Therefore, even if evaporation is not completed on the evaporation pipe outlet side, the refrigerant outlet side temperature of the evaporation pipe 2 is higher than the temperature on the refrigerant inlet side.

  On the other hand, the cooling cylinder 15 provided with the evaporation pipe 2 is constituted by a stainless steel cylinder whose inner wall is a smooth cylindrical inner surface, and a stainless steel helical auger 14 is also concentrically and rotatable inside. Inserted. The outer wall of the cooling cylinder 15 is tightly wound in a spiral manner with the evaporation pipe 2 being flat as described in detail in each embodiment. Solder is injected into the gap between the cooling cylinder 15 and the evaporation pipe 2 for the purpose of improving the coupling and heat conduction performance between them. A heat insulating material 24 is provided outside the cooling cylinder 15.

  On the other hand, in order to supply ice-making water (tap water) as a medium cooled by the evaporation pipe 2 to the cooling cylinder 15, the cooling cylinder 15 has a water tank 9 for storing ice-making water. The stored water is introduced into the lower part of the cooling cylinder 15 by the water supply pipe 12, and unnecessary water is drained by the drain pipe 13. The water supply pipe 12 and the drain pipe 13 are configured to communicate with each other in the lower part of the cooling cylinder 15.

  Further, the auger 14 has a spiral rotary blade 16 formed on the outer surface, a lower part supported by a lower bearing 17 and an upper part supported by an upper bearing 18 constituting an ice compression path, and an auger motor 20. It is rotationally driven by. Further, the ice compressed by the upper bearing 18 is led out to a shooter 19 provided on the upper part.

  On the other hand, the refrigerant inlet side end of the pipe-shaped evaporation pipe 2 wound around the outer wall of the cooling cylinder 15 is connected to a refrigerant inlet pipe 21 having one end connected to the expansion valve 5, and is connected to the refrigerant outlet side end. Is connected to the low-pressure side pipe 22 leading to the compressor 3.

  The operation of the auger type ice making machine IM will be described with the above configuration. When the ice making operation is started, the auger motor 20 is energized and the auger 14 is rotated. When the compressor 3 is started, the high-temperature and high-pressure refrigerant compressed by the compressor 3 is condensed by the condenser 4 and then reaches the expansion valve 5 via the high-pressure side pipe 23. The high-pressure side pipe 23 is heat-exchanged with the low-pressure side pipe 22 through which the refrigerant flowing out of the evaporation pipe 2 flows, so that the refrigerant flowing in the high-pressure side pipe 23 is further cooled by the refrigerant flowing through the low-pressure side pipe 22. Is done.

  The refrigerant reaching the expansion valve 5 is decompressed by the expansion valve 5 and flows into the evaporation pipe 2 wound around the cooling cylinder 15 via the refrigerant inlet pipe 21. The liquid refrigerant that has flowed into the evaporation pipe 2 sequentially evaporates and exhibits a cooling action to cool the inside of the cooling cylinder 15 below the freezing point.

  At this time, since the water for ice making is supplied into the cooling cylinder 15 from the lower part, the auger 14 having the rotary blade 16 formed on the outer surface in the cooling cylinder 15 rotates slowly, so that the inner wall of the cooling cylinder 15 is formed. The ice layer that has grown to a predetermined thickness or more is scraped off by the rotary blade 16, transferred to the upper part of the cooling cylinder 15 (scraped up), and compressed in the ice compression path of the upper bearing 18 to continuously ice. Generate a piece. The generated ice pieces are led out to a shooter 19 provided in the upper part and stored in an ice storage (not shown).

  Here, in this embodiment, a non-azeotropic refrigerant mixture having temperature glide is used as the refrigerant. Therefore, the refrigerant having a low boiling point evaporates first in the evaporation pipe 2 on the refrigerant inlet side, and evaporates on the refrigerant outlet side. In the pipe 2, the refrigerant having a high boiling point evaporates. Therefore, the inside of the cooling cylinder 15 is cooled so that the temperature increases as it goes from the refrigerant inlet to the refrigerant outlet. Hereinafter, an embodiment for uniformly cooling the cooling cylinder 15 around which the evaporation pipe 2 is wound will be described in detail with reference to Examples 1 to 7.

  First, Example 1 will be described with reference to FIG. FIG. 2 is a schematic view showing a state where the evaporation pipe 2 is wound around the cooling cylinder 15. The evaporating pipe 2 in the first embodiment is configured in a substantially hairpin shape by connecting a straight tubular forward pipe 30, a return pipe 31, and end portions thereof with a U-bend pipe 32 having a predetermined curvature. One end of the forward pipe 30 is a refrigerant inlet 2A of the evaporation pipe 2, and the refrigerant that has passed through the expansion valve 5 as a decompression means flows in. The backward pipe 31 is connected to the other end of the forward pipe 30 by a U bend pipe 32. The other end of the return pipe 31 serves as the refrigerant outlet 2B of the evaporation pipe 2.

  The forward pipe 30 and the backward pipe 31 are wound in a spiral shape in a state of being adjacent to each other and flattened, and the cooling cylinder 15 is inserted therein and fixed by soldering. As a result, the forward pipe 30 and the return pipe 31 are adjacent to each other and alternately wound spirally around the outer wall of the cooling cylinder 15.

  In the first embodiment, the refrigerant inlet 2A and the refrigerant outlet 2B positioned at the end portions of the forward pipe 30 and the backward pipe 31 constituting the evaporation pipe 2 are disposed at the upper part of the cooling cylinder 15, and the forward pipe 30 and the backward pipe 31 are disposed at the upper part of the cooling cylinder 15. The U-bend pipe 32 to be connected is arranged in a spirally wound state so as to be the lower part of the cooling cylinder 15.

  With such a configuration, when the refrigerant decompressed by the expansion valve 5 flows into the forward pipe 30 from the refrigerant inlet 2A, a non-azeotropic refrigerant mixture having a temperature glide is used as the refrigerant. In the forward pipe 30 located at the position of the refrigerant, the refrigerant having a low boiling point evaporates first, and the refrigerant gradually evaporates in the process of flowing through the U-bend pipe 32 to the backward pipe 31, and the backward pipe located on the refrigerant outlet 2B side. In 31, the refrigerant having a high boiling point evaporates, and the temperature tends to increase as it goes from the forward pipe 30 to the backward pipe 31.

  However, in the present embodiment, as described above, the outward pipe 30 and the return pipe 31 are alternately wound around the outer wall of the cooling cylinder 15 in a spiral manner, so that the temperature of the refrigerant flowing in the forward pipe 30 and the return pipe 31 are increased. The difference in cooling efficiency of the cooling cylinder 15 due to the difference between the temperature of the refrigerant flowing in the interior can be reduced, and the entire cooling cylinder 15 can be cooled uniformly.

  Therefore, the generated ice can be made uniform by eliminating the cooling unevenness in the cooling cylinder 15. Stable ice making can be realized by eliminating an increase in the scraping load caused by the rotary blade 16 of the auger 14 at a specific location.

  In the embodiment, the connecting portion between the forward pipe 30 and the return pipe 31 uses the U-bend pipe 32 having a predetermined radius of curvature, so that the pressure loss of the refrigerant flow at the connecting portion can be reduced.

  In the first embodiment, the opening degree of the expansion valve 5 is controlled by the control device at the refrigerant outlet 2B of the return pipe 31 so that the refrigerant is in a gas-liquid mixed state or the degree of superheat becomes small. By doing in this way, the refrigerant passing through the evaporation pipe 2 flows in the forward pipe 30 with a high ratio of liquid refrigerant on the refrigerant inlet 2A side, and gradually exhibits a cooling action in the process. When the refrigerant evaporates and flows in the return pipe 31, the ratio of the gas refrigerant becomes higher than that of the liquid refrigerant, so that the flow rate of the refrigerant increases.

  Therefore, the refrigerant flowing in the forward pipe 30 from the refrigerant inlet 2A flows from the upper part to the lower part along the outer wall of the cooling cylinder 15, so that its own weight can be added and the flow velocity can be secured, and the inside of the return pipe 31 The refrigerant flowing through the refrigerant outlet 2B is directed from the lower part to the upper part along the outer wall of the cooling cylinder 15, and thus the flow rate of the refrigerant can be increased by increasing the ratio of the gas refrigerant to the liquid refrigerant. Therefore, the oil circulating in the refrigerant circuit together with the refrigerant can be smoothly returned to the compressor 3 together with the liquid refrigerant whose flow rate is increased. Oil return can be promoted.

  Next, Example 2 will be described with reference to FIG. FIG. 3 is a schematic view showing a state where the evaporation pipe 2 is wound around the cooling cylinder 15. In the second embodiment, a case where a capillary tube is used as the decompression means will be described. In the second embodiment, similarly to the first embodiment, the evaporation pipe 2 is constituted by the forward pipe 30, the backward pipe 31, and the U-bend pipe 32, and the forward pipe 30 and the backward pipe 31 are adjacent to each other. Alternately and in a flat state, the outer wall of the cooling cylinder 15 is spirally wound.

  In this case, the refrigerant inlet 2A and the refrigerant outlet 2B located at the ends of the forward pipe 30 and the backward pipe 31 constituting the evaporation pipe 2 are connected to the lower part of the cooling cylinder 15, and the forward pipe 30 and the backward pipe 31 are connected to each other. The bend pipe 32 is arranged in a spirally wound state so as to be an upper part of the cooling cylinder 15.

  Even in such a configuration, similarly to the first embodiment, the forward pipe 30 and the return pipe 31 are alternately wound around the outer wall of the cooling cylinder 15 in a spiral shape, so that the temperature of the refrigerant flowing in the forward pipe 30 and the return path The difference in the cooling efficiency of the cooling cylinder 15 due to the difference between the temperature of the refrigerant flowing in the pipe 31 can be reduced, and the entire cooling cylinder 15 can be uniformly cooled.

  Further, at this time, by using a capillary tube as the pressure reducing means, most of the refrigerant may become a gas refrigerant in the process of flowing through the evaporation pipe 2. Even in this case, the return pipe 31 is arranged from the upper part to the lower part along the outer wall of the cooling cylinder 15, so that the refrigerant flowing into the return pipe 31 is almost a gas refrigerant. The oil circulating in the refrigerant circuit together with the refrigerant can flow toward the refrigerant outlet 2B by its own weight. Therefore, it is possible to promote oil return.

  Next, Example 3 will be described with reference to FIG. FIG. 4 shows a partially enlarged cross-sectional view of the cooling cylinder 15 with the evaporation pipe 2 wound thereon. In the third embodiment, ice (water) is conveyed from the bottom to the top in the direction of gravity in the cooling cylinder 15, whereas the refrigerant inlet 2 </ b> A of the evaporation pipe 2 is connected to the cooling cylinder 15 on the outer wall of the cooling cylinder 15. The refrigerant outlet 2B is spirally wound so as to be the upper part, and the flow direction of the refrigerant in the evaporation pipe 2 is set to be the same as the conveying direction of the ice.

  In this way, by circulating the refrigerant from the bottom to the top in the direction of gravity, the gas refrigerant flowing out from the refrigerant outlet 2B of the evaporation pipe 2 is preferentially discharged, and the liquid refrigerant is retained in the evaporation pipe 2. It is possible to promote evaporation.

  Here, in this embodiment, the evaporation pipe 2 is spirally wound around the outer wall of the cooling cylinder 15 in a flattened state so that the flattening rate increases as the refrigerant outlet 2B is approached.

  As a result, the refrigerant having the low boiling point evaporates first on the refrigerant inlet 2A side of the evaporation pipe 2 and gradually evaporates, and the refrigerant having the high boiling point evaporates on the refrigerant outlet 2B side. The temperature tends to increase as it goes from the side to the refrigerant outlet 2B side. Thus, the flattening rate of the evaporation pipe 2 increases as it approaches the refrigerant outlet 2B of the evaporation pipe 2, The closer to the refrigerant outlet 2B, the larger the contact area between the evaporation pipe 2 and the cooling cylinder 15.

  Thereby, in the refrigerant | coolant inlet 2A side, ie, the location farther from the refrigerant outlet 2B, the pressure loss of the refrigerant flow due to flattening can be reduced, and cooling by the refrigerant flowing in the evaporation pipe 2 as it approaches the refrigerant outlet 2B. The cooling efficiency of the cylinder 15 can be increased.

  Therefore, on the refrigerant inlet 2A side where the evaporation temperature is low, the contact area between the evaporation pipe 2 and the cooling cylinder 15 is limited, and as the evaporation temperature increases, that is, the closer to the refrigerant outlet 2B, the evaporation pipe 2 and the cooling cylinder. By increasing the contact area with 15, the entire cooling cylinder 15 can be uniformly cooled.

  Thereby, the generated ice can be made uniform by eliminating the cooling unevenness in the cooling cylinder 15. Stable ice making can be realized by eliminating an increase in the scraping load at a specific location.

  Since the vicinity of the lower portion of the cooling cylinder 15 has a lot of ice containing a large amount of liquid, the change in the flattening ratio of the evaporation pipe 2 may be performed from an area excluding the lower portion of the cooling cylinder 15. This makes it possible to achieve effective and stable ice making.

  Next, Example 4 will be described with reference to FIG. FIG. 5 shows a partially enlarged cross-sectional view of the cooling cylinder 15 with the evaporation pipe 2 wound thereon. In the fourth embodiment, in consideration of the cooling efficiency of the cooling cylinder 15 as in the third embodiment, the refrigerant inlet 2A of the evaporation pipe 2 is spirally wound so that the lower part of the cooling cylinder 15 and the refrigerant outlet 2B become the upper part.

  In the fourth embodiment, the amount of solder 25 injected into the gap between the evaporation pipe 2 and the cooling cylinder 15 is changed so as to increase toward the refrigerant outlet 2B. In addition, the change of the injection amount of the solder 25 may be increased by increasing the temperature so as to approach the coolant outlet 2B when soldering.

  As a result, the refrigerant having a low boiling point evaporates first on the refrigerant inlet 2A side of the evaporation pipe 2 and gradually evaporates, and the refrigerant having a high boiling point evaporates on the refrigerant outlet 2B side. Although the temperature tends to increase as it goes from the side to the refrigerant outlet 2B side, the amount of solder 25 injected into the gap between the cooling cylinder 15 and the evaporation pipe 2 increases as the temperature approaches the refrigerant outlet 2B of the evaporation pipe 2 in this way. Therefore, the closer to the refrigerant outlet 2B, the higher the coupling between the evaporation pipe 2 and the cooling cylinder 15 and the heat conduction performance thereof, and the entire cooling cylinder 15 can be uniformly cooled.

  Therefore, the generated ice can be made uniform by eliminating the cooling unevenness in the cooling cylinder 15. Stable ice making can be realized by eliminating an increase in the scraping load at a specific location.

  In addition, since there is a lot of ice containing a lot of liquid near the lower portion of the cooling cylinder 15, the injection amount of the solder 25 may be changed from an area excluding the lower portion of the cooling cylinder 15. This makes it possible to achieve effective and stable ice making.

  Next, Example 5 will be described with reference to FIG. FIG. 6 shows a schematic view of the cooling cylinder 15 covered with the heat insulating material 24. In the fifth embodiment, similarly to the third embodiment, the cooling efficiency of the cooling cylinder 15 is taken into consideration, and the refrigerant inlet 2A of the evaporation pipe 2 is spirally wound so that the lower part of the cooling cylinder 15 and the refrigerant outlet 2B become the upper part.

  In Example 5, the thickness dimension of the heat insulating material 24 provided outside the cooling cylinder 15 and covering the cooling cylinder 15 and the evaporation pipe 2 wound around the cooling cylinder 15 is set at the refrigerant outlet 2B of the evaporation pipe 2. It has been changed to become larger as it gets closer.

  As a result, the refrigerant having the low boiling point evaporates first on the refrigerant inlet 2A side of the evaporation pipe 2 and gradually evaporates, and the refrigerant having the high boiling point evaporates on the refrigerant outlet 2B side. The temperature tends to increase as it goes from the side to the refrigerant outlet 2B side, but the thickness dimension of the heat insulating material 24 covering the outside of the cooling cylinder 15 is increased as the temperature approaches the refrigerant outlet 2B of the evaporation pipe 2 as described above. Therefore, the heat insulation efficiency can be increased as it approaches the refrigerant outlet 2B, whereby the entire cooling cylinder 15 can be uniformly cooled.

  Therefore, the entire cooling cylinder 15 can be cooled uniformly, and the generated ice can be made homogeneous. Stable ice making can be realized by eliminating an increase in the scraping load at a specific location.

  Note that the vicinity of the lower portion of the cooling cylinder 15 has a lot of ice containing a large amount of liquid, and thus the thickness of the heat insulating material 24 may be changed from the region excluding the lower portion of the cooling cylinder 15. This makes it possible to achieve effective and stable ice making.

  Next, Example 6 will be described with reference to FIG. FIG. 7 shows a partially enlarged cross-sectional view of the cooling cylinder 15 with the evaporation pipe 2 wound thereon. In the sixth embodiment, in consideration of the cooling efficiency of the cooling cylinder 15 as in the third embodiment, the refrigerant inlet 2A of the evaporation pipe 2 is spirally wound so that the lower part of the cooling cylinder 15 and the refrigerant outlet 2B become the upper part.

  In the sixth embodiment, the clearance 27 between the cooling cylinder 15 and the rotary blade 16 formed in a spiral shape on the outer surface of the auger 14 inserted into the cooling cylinder 15 as described above is a refrigerant of the evaporation pipe 2. It changes so that it may become so small that it approaches the exit 2B.

  That is, the gap 27 between the rotary blade 16 of the auger 14 and the inner surface of the cooling cylinder 15 is narrower (smaller) on the refrigerant outlet 2B side, and becomes wider (larger) as the distance from the refrigerant outlet 2B is closer to the refrigerant inlet 2A. Is provided.

  With such a configuration, the refrigerant having a low boiling point evaporates first on the refrigerant inlet 2A side of the evaporation pipe 2, the refrigerant gradually evaporates, and the refrigerant having a high boiling point evaporates on the refrigerant outlet 2B side. The temperature tends to increase as it goes from the refrigerant inlet 2A side to the refrigerant outlet 2B side. As a result, thicker ice is formed in the cooling cylinder 15 closer to the refrigerant inlet 2A, and thinner ice is closer to the refrigerant outlet 2B. Will be formed.

  On the other hand, the rotary blade 16 of the auger 14 is such that the closer to the refrigerant inlet 2A, the wider (larger) the gap 27 with the inner surface of the cooling cylinder 15, and the closer to the refrigerant outlet 2B, the narrower (smaller) the gap 27 becomes. Therefore, the amount of ice scraped off by the rotary blade 16 by the rotation of the auger 14 can be made uniform throughout the cooling cylinder 15. As a result, the ice can be transferred to the upper ice compression path while being scraped evenly in the process of transferring the ice from the lower part to the upper part of the cooling cylinder 15, and stable ice making can be realized.

  In addition, since there is a lot of ice containing a lot of liquid in the vicinity of the lower portion of the cooling cylinder 15, the change in the size of the gap 27 between the cooling cylinder 15 and the rotary blade 16 of the auger 14 is an area excluding the lower portion of the cooling cylinder 15. You may go from. This makes it possible to achieve effective and stable ice making.

  Next, Example 7 will be described with reference to FIG. FIG. 8 shows a partially enlarged sectional view of the cooling cylinder 15 in a state where the evaporation pipe 2 is wound. In the seventh embodiment, similarly to the third embodiment, the cooling efficiency of the cooling cylinder 15 is taken into consideration, and the refrigerant inlet 2A of the evaporation pipe 2 is spirally wound so that the lower part of the cooling cylinder 15 and the refrigerant outlet 2B become the upper part.

  In the seventh embodiment, the pitch P of the rotary blade 16 formed in a spiral shape on the outer surface of the auger 14 inserted into the cooling cylinder 15 as described above becomes smaller as it approaches the refrigerant outlet 2B of the evaporation pipe 2. Has been changed to be.

  That is, the pitch P of the rotary blade 16 formed in a spiral on the auger 14 is provided so as to become narrower (smaller) as it approaches the refrigerant outlet 2B and to become wider (larger) as it approaches the refrigerant inlet 2A. As shown in FIG. 8, the pitch P1 located on the refrigerant outlet 2B side is smaller than the pitch P2 located on the refrigerant inlet 2A side.

  With such a configuration, the refrigerant having a low boiling point evaporates first on the refrigerant inlet 2A side of the evaporation pipe 2, the refrigerant gradually evaporates, and the refrigerant having a high boiling point evaporates on the refrigerant outlet 2B side. The temperature tends to increase as it goes from the refrigerant inlet 2A side to the refrigerant outlet 2B side. As a result, thicker ice is formed in the cooling cylinder 15 closer to the refrigerant inlet 2A, and thinner ice is closer to the refrigerant outlet 2B. Will be formed.

  On the other hand, since the pitch of the spiral rotary blade 16 formed on the outer surface of the auger 14 is configured to become smaller as it approaches the refrigerant outlet 2B of the evaporation pipe 2, the pitch of the auger 14 is reduced by one rotation. The amount of ice scraped off by the rotary blade 16 is reduced at locations away from the refrigerant outlet 2B having a large pitch because the transfer dimension of the rotary blade 16 is large, and at locations near the refrigerant outlet 2B having a small pitch, the rotary blade 16 is removed. Since the transfer dimension is small, it increases.

  Therefore, the scraping amount of ice can be made uniform in the entire cooling cylinder 15. As a result, the ice can be transferred to the upper ice compression path while being scraped evenly in the process of transferring the ice from the lower part to the upper part of the cooling cylinder 15, and stable ice making can be realized.

  Note that since there is a lot of liquid-rich ice near the lower portion of the cooling cylinder 15, the pitch of the rotating blade 16 of the cooling cylinder 15 and the auger 14 can be changed from an area excluding the lower portion of the cooling cylinder 15. good. This makes it possible to achieve effective and stable ice making.

R refrigeration equipment IM auger type ice making machine 2 evaporation pipe 2A refrigerant inlet 2B refrigerant outlet 3 compressor 4 condenser 5 expansion valve (pressure reducing means)
6 Refrigerant Circuit 12 Water Supply Pipe 14 Auger 15 Cooling Cylinder 16 Rotating Blade 21 Refrigerant Inlet Pipe 22 Low Pressure Side Pipe 23 High Pressure Side Pipe 24 Thermal Insulation Material 25 Solder 27 Clearance 30 Outward Pipe 31 Return Pipe 32 U Bend Pipe

Claims (6)

A cooling cylinder provided with an evaporation pipe on the outer wall, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger, and ice generated on the inner wall of the cooling cylinder In the auger type ice making machine that continuously generates ice pieces by scraping with the auger, transferring upward and compressing,
A refrigerant circuit is constructed from the compressor, the condenser, the decompression means, and the evaporation pipe, and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture,
The evaporation pipe is spirally wound around the outer wall of the cooling cylinder in a flat state, and the flatness of the evaporation pipe is increased toward the refrigerant outlet of the evaporation pipe. Ogre type ice machine. A cooling cylinder provided with an evaporation pipe on the outer wall, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger, and ice generated on the inner wall of the cooling cylinder In the auger type ice making machine that continuously generates ice pieces by scraping with the auger, transferring upward and compressing,
A refrigerant circuit is constructed from the compressor, the condenser, the decompression means, and the evaporation pipe, and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture,
The evaporation pipe is spirally wound around the outer wall of the cooling cylinder, and solder is injected into a gap between the cooling cylinder and the evaporation pipe, and the injection amount of the solder approaches the refrigerant outlet of the evaporation pipe. An auger type ice maker characterized by being increased in quantity. A cooling cylinder provided with an evaporation pipe on the outer wall, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger, and ice generated on the inner wall of the cooling cylinder In the auger type ice making machine that continuously generates ice pieces by scraping with the auger, transferring upward and compressing,
A refrigerant circuit is constructed from the compressor, the condenser, the decompression means, and the evaporation pipe, and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture,
The evaporation pipe is spirally wound around the outer wall of the cooling cylinder, and a heat insulating material is provided on the outer side of the cooling cylinder, and the thickness of the heat insulating material increases as it approaches the refrigerant outlet of the evaporation pipe. An auger type ice maker characterized by being made. A cooling cylinder provided with an evaporation pipe on the outer wall, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger, and ice generated on the inner wall of the cooling cylinder In the auger type ice making machine that continuously generates ice pieces by scraping with the auger, transferring upward and compressing,
A refrigerant circuit is constructed from the compressor, the condenser, the decompression means, and the evaporation pipe, and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture,
The evaporation pipe is spirally wound around the outer wall of the cooling cylinder, and the gap between the cooling cylinder and the auger is made smaller as it approaches the refrigerant outlet of the evaporation pipe. Ice machine. A cooling cylinder provided with an evaporation pipe on the outer wall, an auger inserted concentrically and rotatably in the cooling cylinder, and an auger motor for rotationally driving the auger, and ice generated on the inner wall of the cooling cylinder In the auger type ice making machine that continuously generates ice pieces by scraping with the auger, transferring upward and compressing,
A refrigerant circuit is constructed from the compressor, the condenser, the decompression means, and the evaporation pipe, and includes a refrigeration apparatus filled with a non-azeotropic refrigerant mixture,
The evaporation pipe is spirally wound around the outer wall of the cooling cylinder, and the pitch of the spiral blade formed on the outer surface of the auger is made smaller as it approaches the refrigerant outlet of the evaporation pipe. An auger type ice machine.   The refrigerant inlet of the evaporation pipe is arranged at the lower part of the cooling cylinder and the refrigerant outlet is at the upper part, and the change in the flatness of the evaporation pipe, the change in the amount of solder injected, the change in the thickness of the heat insulating material, The change of the gap between the cooling cylinder and the auger or the change of the pitch of the blade of the auger is performed in a region excluding the lower part of the cooling cylinder. The auger type ice maker according to any one of the above.

Images