JP2005003231A - Method and device for manufacturing slurry ice - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To manufacture a slurry ice by adjusting the content of ice without impairing the separability of ice crystal and inhibiting the smooth discharge of the slurry ice. <P>SOLUTION: In a refrigerating cycle 2 composed of an evaporator 6, a compressor 3, a condenser 4 and an expansion valve 5, a supply pipe conduit provided with a supply pump 11 is connected with an inlet 6c of an inner pipe of the evaporator 6, and a discharge pipe conduit 8 is connected with an outlet 6d. A refrigerant of the refrigerating cycle 2 is supplied to an annular space formed between an outer pipe and an inner pipe of the evaporator 6 through an inflow port 6a, and discharged through an outflow port 6b. Further, a brine is supplied to the inner pipe of the evaporator 6 through a supply circuit 7 and a supply pump 11 to be stirred by a rotating member rotated in the inner pipe of the evaporator 6, the ice crystal produced on an inner peripheral face of the inner pipe of the evaporator 6 is liberated in the brine, and the slurry ice is discharged to the discharge pipe conduit 8. Further, a bypass pipe conduit 9 provided with a circulating pump 12 is mounted between the discharge pipe conduit 8 and the supply pipe conduit 7 at a downstream side of the supply pump 11. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and apparatus for producing slurry ice.
[0002]
[Prior art]
Conventionally, in a refrigeration cycle comprising an evaporator, a compressor, a condenser, and an expansion valve, the evaporator is rotated into a cylindrical outer tube, a cylindrical inner tube inserted into the outer tube, and an inner tube. A rotating member provided freely, and provided with an inlet and an outlet for the refrigerant communicating with an annular space formed between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube, and the inner tube It is known to use as an ice making machine by providing an inlet and an outlet for communicating brine. That is, the refrigerant circulating in the refrigeration cycle is supplied to the annular space of the evaporator through the inlet, discharged through the outlet, and the brine is supplied to the inner pipe through the inlet through the supply line and the supply pump. The brine is agitated by a rotating rotating member to release ice crystals generated on the inner peripheral surface of the inner tube into the brine, and a liquid in which fine ice and brine are mixed (hereinafter referred to as slurry ice) is passed through the outlet. Discharging to a discharge pipe has been put into practical use (see, for example, Patent Document 1).
[0003]
[Patent Document 1]
Japanese Patent No. 3251187 [0004]
[Problems to be solved by the invention]
By the way, in the ice making machine disclosed in Patent Document 1, the brine flow supplied to the evaporator and the swirl flow by the rotating member that rotates around the evaporator center cause the refrigerant and brine to transfer to the inner peripheral surface of the inner pipe that is the heat transfer surface. At the same time as generating ice crystals, the ice crystals are liberated in the brine without adhering to the heat transfer surface, generating microspherical ice. As a result of the decrease in the peelability of ice crystals from the surface, ice adheres to the heat transfer surface and operation is hindered. In addition, since the ice crystals separated in the brine are discharged through the outlet of the evaporator by the brine flow, if the supply amount of the brine is reduced too much, the ice crystals stay near the outlet of the evaporator and become slurry ice. Smooth discharge is hindered.
[0005]
On the other hand, in this ice making machine, the ice content in the slurry ice discharged from the evaporator is controlled by the supply amount of the brine. For the reasons described above, the supply amount of the brine must be ensured above a certain level. For this reason, in an evaporator with a small ice making capacity, ice making could only be performed with a low ice content.
[0006]
Specifically, when slurry ice is produced from 28 ° C. brine using the evaporator 6 having an ice making capacity of 4.5 kw, the heat transfer efficiency decreases when the brine flow rate is 6.0 liters per minute or less. Further, when the amount is 2.0 liters or less per minute, ice crystals stay near the outlet of the evaporator, and smooth slurry ice discharge is hindered, making it impossible to make ice. On the other hand, in order to set the ice concentration in the slurry ice to 10%, the brine flow rate needs to be 1.7 liters per minute. However, as described above, this brine flow rate cannot make ice. is there.
[0007]
The present invention has been made in view of such problems, and even in an evaporator having a small ice making capacity, it does not deteriorate the peelability of ice crystals and inhibits smooth discharge of slurry ice. The present invention provides a slurry ice production method and apparatus capable of producing slurry ice by adjusting the ice content.
[0008]
[Means for Solving the Problems]
A method for producing slurry ice of the present invention includes a cylindrical outer tube, a cylindrical inner tube inserted into the outer tube, and a rotating member provided rotatably in the inner tube, and an inner peripheral surface of the outer tube. An evaporator having an inlet and an outlet for a refrigerant communicating with an annular space formed between the inner pipe and an outer peripheral surface of the inner pipe, and an inlet and an outlet for a brine communicating with the inner pipe, a compressor, A refrigerating cycle comprising a condenser and an expansion valve, wherein the refrigerant circulating in the refrigerating cycle is supplied to the annular space through the inflow port and discharged through the outflow port, and the brine is supplied through the supply line and the supply pump. The brine is supplied to the inner pipe through the inlet, and the brine is stirred by the rotating rotating member to release the ice crystals generated on the inner peripheral surface of the inner pipe into the brine, and the slurry ice is discharged to the discharge pipe through the outlet. Sura to -In the ice production method, the slurry ice is circulated between the discharge pipe, the bypass pipe, the supply pipe and the inner pipe of the evaporator through a circulation pump, while the brine is supplied to the supply pipe through a supply pump. While supplying, slurry ice with a flow rate corresponding to the amount of brine supplied by the supply pump is discharged from the other end of the discharge pipe.
[0009]
According to the present invention, the supply pump is driven to supply brine to the inner pipe of the evaporator through the supply line, and the circulation pump is driven to pass the brine discharged to the discharge line through the bypass line. By joining the supply line, the brine is filled into the discharge line, the bypass line, the supply line, and the inner pipe of the evaporator, and a constant flow rate of brine is circulated between them. At this time, the brine having a flow rate corresponding to the supply amount of the supply pump becomes excessive and is discharged from the other end of the discharge pipe.
[0010]
On the other hand, if the refrigeration cycle is operated in this state, the refrigerant circulates between the compressor, the condenser, the expansion valve, and the evaporator. At this time, since the refrigerant supplied to the annular space of the evaporator through the expansion valve evaporates in the annular space and performs a cooling action, the brine filled in the inner pipe of the evaporator is in heat transfer with the refrigerant. Ice crystals are generated on the inner peripheral surface of the inner tube, which is the surface. Further, since the rotating member of the evaporator is rotated, ice crystals generated on the inner peripheral surface of the inner tube by the swirling flow of the brine accompanying the rotation of the rotating member are released into the brine. After that, slurry ice, which is a brine containing ice, is discharged to the discharge pipe by the brine flow, and circulates between the discharge pipe, the bypass pipe, the supply pipe and the inner pipe of the evaporator via a circulation pump. At the same time, slurry ice having a flow rate corresponding to the amount of brine supplied by the supply pump becomes excessive and is discharged from the other end of the discharge pipe.
[0011]
Here, if the amount of slurry ice circulated by the circulation pump is set to a flow rate that does not reduce the heat transfer efficiency of the evaporator, the slurry ice will not deteriorate the detachability of the ice crystals and the smoothness of the slurry ice. It smoothly circulates between the discharge pipe, the bypass pipe, the supply pipe, and the inner pipe of the evaporator without hindering the discharge. Since the brine at an arbitrary flow rate supplied by the supply pump becomes a new supply amount to the evaporator, the same amount of slurry ice having an ice concentration corresponding to the supply amount is discharged from the other end of the discharge pipe. Is done.
[0012]
As a result, even in an evaporator having a small ice-making ability, slurry ice can be obtained by adjusting the ice content without degrading ice crystal detachability and without hindering smooth discharge of slurry ice. it can.
[0013]
An apparatus for producing slurry ice of the present invention includes a cylindrical outer tube, a cylindrical inner tube inserted into the outer tube, and a rotating member provided rotatably in the inner tube, and an inner peripheral surface of the outer tube. An evaporator having an inlet and an outlet for a refrigerant communicating with an annular space formed between the inner pipe and an outer peripheral surface of the inner pipe, and an inlet and an outlet for a brine communicating with the inner pipe, a compressor, A refrigeration cycle comprising a condenser and an expansion valve, wherein a supply line provided with a supply pump is connected to an inlet communicating with the inner pipe, and a discharge line is connected to the outlet of the refrigeration cycle. The refrigerant circulating through the inlet is supplied to the annular space through the inlet, discharged through the outlet, the brine is supplied to the inner pipe through the supply circuit and the supply pump, and the brine is stirred by the rotating member that rotates. Ice generated on the inner surface of In a slurry ice manufacturing apparatus that releases crystals into brine and discharges slurry ice to a discharge pipe, a bypass in which a circulation pump is disposed between the discharge pipe and a supply pipe downstream of the supply pump It is characterized by connecting pipes.
[0014]
According to the present invention, the supply pump is driven to supply brine to the inner pipe of the evaporator through the supply line, and the circulation pump is driven to pass the brine discharged to the discharge line through the bypass line. By joining the supply line, the brine is filled into the discharge line, the bypass line, the supply line, and the inner pipe of the evaporator, and a constant flow rate of brine is circulated between them. At this time, the brine having a flow rate corresponding to the supply amount of the supply pump becomes excessive and is discharged from the other end of the discharge pipe.
[0015]
On the other hand, if the refrigeration cycle is operated in this state, the refrigerant circulates between the compressor, the condenser, the expansion valve, and the evaporator. At this time, since the refrigerant supplied to the annular space of the evaporator through the expansion valve evaporates in the annular space and performs a cooling action, the brine filled in the inner pipe of the evaporator is in heat transfer with the refrigerant. Ice crystals are generated on the inner peripheral surface of the inner tube, which is the surface. Further, since the rotating member of the evaporator is rotated, ice crystals generated on the inner peripheral surface of the inner tube by the swirling flow of the brine accompanying the rotation of the rotating member are released into the brine. After that, slurry ice, which is a brine containing ice, is discharged to the discharge pipe by the brine flow, and circulates between the discharge pipe, the bypass pipe, the supply pipe and the inner pipe of the evaporator via a circulation pump. At the same time, slurry ice having a flow rate corresponding to the amount of brine supplied by the supply pump becomes excessive and is discharged from the other end of the discharge pipe.
[0016]
In this case, the brine having a set flow rate supplied by the supply pump becomes a new supply amount to the evaporator, and the ice concentration in the brine is determined by the supply amount, so that it eventually corresponds to the supply amount of brine by the supply pump. The same amount of slurry ice having an ice concentration can be discharged from the other end of the discharge pipe.
[0017]
As a result, by connecting a bypass line having a circulation pump between the discharge line and the supply line on the downstream side of the supply pump, the slurry can be removed without reducing the peelability of ice crystals. Slurry ice can be produced by adjusting the ice content without hindering smooth discharge of ice.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0019]
FIG. 1 shows an embodiment of the slurry ice production apparatus 1 of the present invention.
[0020]
The manufacturing apparatus 1 includes a compressor 3 constituting a refrigeration cycle 2, a condenser 4, an expansion valve 5, an evaporator 6 serving as an ice making machine, and a brine having one end connected to the evaporator 6; 1 comprises a supply line 7 and a discharge line 8 for sodium chloride solution (seawater), and a bypass line 9 connected between the discharge line 8 and the supply line 7. The other end is connected to a storage tank 10 for storing seawater, while a supply pump 11 is provided in the supply line 7, and a circulation pump 12 is provided in the bypass line 9. Yes. In this case, the bypass conduit 9 is located on the downstream side of the supply pump 11 and connected to the supply conduit 7.
[0021]
Although not shown in detail, the evaporator 6 has a cylindrical outer tube, a cylindrical inner tube fitted into the outer tube, and a rotating member rotatably provided in the inner tube, as described above. The refrigerant inlet 6a and the outlet 6b communicating with the annular space formed between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube are provided, and the brine (seawater) communicates with the inner tube. The inlet 6c and the outlet 6d are provided.
[0022]
Next, the operation of the manufacturing apparatus 1 will be described.
[0023]
First, seawater is pumped into the storage tank 10 via a pump (not shown). In this state, the supply pump 11 is driven, and the seawater in the storage tank 10 is supplied to the inner pipe of the evaporator 6 through the supply line 7 and the inlet 6c. Supply. At the same time, the circulation pump 12 is driven, and the seawater discharged to the discharge pipe 8 through the outlet 6 d of the evaporator 6 is joined to the supply pipe 7 through the bypass pipe 9 and supplied to the evaporator 6 again.
[0024]
Therefore, the seawater is filled in the discharge pipe 8, the bypass pipe 9, the supply pipe 7 and the inner pipe of the evaporator 6, and a constant flow of seawater is discharged by the circulation pump 12 to the discharge pipe 8, the bypass pipe 9, and the supply pipe. At the same time as circulating between the passage 7 and the inner pipe of the evaporator 6, surplus seawater with a flow rate corresponding to the supply amount of the supply pump 11 is discharged from the other end of the discharge pipe 8.
[0025]
If the refrigeration cycle 2 is operated in this state, a refrigerant such as chlorofluorocarbon is compressed by the compressor 3 and discharged into the condenser 4 as a high-temperature and high-pressure refrigerant gas. Thereafter, the refrigerant gas is condensed by the condenser 4 and supplied to the expansion valve 5 as a high-pressure refrigerant liquid. Next, the refrigerant liquid becomes wet gas by the expansion valve 5, is supplied to the annular space through the inlet 6 a of the evaporator 6, evaporates in the annular space and performs a cooling action, and then passes through the outlet 6 b as the refrigerant gas. It is sucked into the compressor 3. Thus, the refrigerant circulates through the compressor 3, the condenser 4, the expansion valve 5, and the evaporator 6 of the refrigeration cycle 1.
[0026]
Then, by operating the refrigeration cycle 2, the refrigerant evaporates in the annular space of the evaporator 6 and performs a cooling action. Therefore, the seawater filled and circulated in the inner pipe of the evaporator 6 Ice crystals are generated on the inner peripheral surface of the inner tube, which is the heat transfer surface. At this time, since the rotating member of the evaporator 6 is rotating, the ice crystals generated on the inner peripheral surface of the inner pipe are freed in the seawater by the swirling flow of the seawater accompanying the rotation of the rotating member. Let Thereafter, slurry ice, which is seawater containing ice, is discharged to the discharge pipe 8 through the outlet 6d by the seawater flow by the supply pump 11, and, as described above, the discharge pipe 8, bypass pipe through the circulation pump 12. While circulating between the passage 9, the supply pipe 7 and the inner pipe of the evaporator 6, the slurry ice having a flow rate corresponding to the supply amount of seawater supplied by the supply pump 11 becomes surplus and the other of the discharge pipe 8. Discharged from the edge.
[0027]
Accordingly, if seawater having an arbitrary flow rate is supplied by the supply pump 11, the same amount of slurry ice having an ice concentration corresponding to the flow rate can be discharged from the other end of the discharge pipe 8.
[0028]
For example, when slurry ice is produced from seawater at 28 ° C., which is a temperature corresponding to midsummer seawater temperature, using the evaporator 6 having an ice making capacity of 4.5 kw, a flow rate of 6.0 liters per minute by the circulation pump 12 At the same time, the slurry ice is circulated at the same time as the supply pump 11 supplies seawater from the storage tank 10 at a flow rate of 1.7 liters per minute, whereby slurry ice having an ice concentration of 10% is discharged from the other end of the discharge pipe 8. It can be taken out.
[0029]
Similarly, by supplying seawater at a flow rate of 1.4 liters per minute by the supply pump 11, the ice concentration of the slurry ice from the other end of the discharge pipe 8 is about 20%. By supplying seawater at a flow rate of 2 liters, the ice concentration of the slurry ice from the other end of the discharge pipe 8 becomes about 30%, and slurry ice having an arbitrary ice concentration can be obtained.
[0030]
In the above-described embodiment, the manufacturing apparatus 1 can be installed not only on land, for example, on a fishing port, but also on a fishing boat.
[0031]
【The invention's effect】
Thus, according to the present invention, even in an evaporator having a small ice making capacity, the ice content in the slurry ice can be reduced without deteriorating the peelability of the ice crystals and without hindering smooth discharge of the slurry ice. It can be adjusted to produce slurry ice.
[Brief description of the drawings]
FIG. 1 is a schematic view schematically showing an embodiment of the slurry ice production apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Manufacturing apparatus 2 Refrigeration cycle 3 Compressor 4 Condenser 5 Expansion valve 6 Evaporator (ice machine)
7 Supply line 8 Discharge line 9 Bypass line 10 Storage tank 11 Supply pump 12 Circulation pump

Claims (2)

A cylindrical outer tube, a cylindrical inner tube inserted into the outer tube, and a rotating member rotatably provided in the inner tube, and between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube An evaporator having a refrigerant inlet and outlet communicating with the formed annular space and a brine inlet and outlet communicating with the inner pipe, a compressor, a condenser, and an expansion valve are provided. A refrigerant that circulates through the refrigeration cycle is supplied to the annular space through the inlet, is discharged through the outlet, and the brine is supplied to the inner pipe through the inlet through the supply line and the supply pump. In the method for producing slurry ice, the brine is stirred by a rotating rotating member to release ice crystals formed on the inner peripheral surface of the inner pipe into the brine, and the slurry ice is discharged to the discharge pipe through the outlet. The slurry ice is circulated between the discharge pipe, the bypass pipe, the supply pipe and the inner pipe of the evaporator through the pump, while the brine is supplied to the supply pipe through the supply pump, A method for producing slurry ice, characterized in that slurry ice having a flow rate corresponding to the supply amount of the slurry is discharged from the other end of the discharge pipe. A cylindrical outer tube, a cylindrical inner tube inserted into the outer tube, and a rotating member rotatably provided in the inner tube, and between the inner peripheral surface of the outer tube and the outer peripheral surface of the inner tube An evaporator having a refrigerant inlet and outlet communicating with the formed annular space and a brine inlet and outlet communicating with the inner pipe, a compressor, a condenser, and an expansion valve are provided. A refrigeration cycle comprising a supply pipe provided with a supply pump connected to an inlet communicating with the inner pipe, a discharge pipe connected to the outlet thereof, and a refrigerant circulating in the refrigeration cycle passing through the inlet through the annular space The ice crystals are generated on the inner peripheral surface of the inner pipe by being discharged by the outlet and supplying the brine to the inner pipe through the supply circuit and the supply pump, and stirring the brine by the rotating rotating member. In the brine and In the slurry ice manufacturing apparatus for discharging ice to the discharge pipe, a bypass pipe having a circulation pump is connected between the discharge pipe and a supply pipe downstream of the supply pump. An apparatus for producing slurry ice.

Images