JP4451073B2 - Freezing detection method for ice manufacturing apparatus and ice manufacturing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention includes a heat exchanger that brings water into a supercooled state, a closed system releaser that releases supercooled water, and a connecting pipe that connects the outlet of the heat exchanger and the inlet of the releaser. The present invention relates to a method for detecting freezing in an ice manufacturing apparatus, and an ice manufacturing apparatus capable of performing the method.
[0002]
[Prior art]
When freezing occurs in the heat exchanger that produces supercooled water, the flow rate in the heat exchanger is gradually blocked by ice, so the circulation flow rate decreases, and finally the water circulation flow rate becomes zero. Otherwise, the heat exchanger will be damaged. Therefore, in order to prevent such a situation, it is possible to avoid damage to the heat exchanger by quickly capturing such a change in flow rate and switching to the freeze release operation.
[0003]
In principle, this decrease in flow rate can be detected using only a flow meter that measures the total circulating water volume of the supercooled water. However, in practice, fluctuations in the flow rate are constantly occurring due to pump pressure fluctuations, inhomogeneous flow in the downstream piping, changes in the ice storage state in the heat storage tank, and switching of the downstream piping system. It is difficult to determine whether the change in the flow rate is due to freezing or other factors. For this reason, in order to reliably recognize that the cause of the flow rate decrease is due to freezing, it is necessary to increase the threshold value of the flow rate fluctuation range, but there is a problem that detection of freezing is delayed. Conversely, if the threshold value of the flow rate fluctuation range is reduced to increase the sensitivity, there is a problem that the freeze release operation may start (malfunction) even though it is not actually frozen. .
[0004]
Conventionally, there are the following technologies to improve this. First, instead of detecting a change in flow rate, there is one that detects freezing by detecting a pressure change at the inlet of a heat exchanger (Patent Document 1). In addition, there has been proposed a method for determining freezing using two independent methods (a method using a thermometer and a method using a flow meter). (Patent Document 2).
[0005]
[Patent Document 1]
JP-A-6-300398 [Patent Document 2]
Japanese Patent No. 3087629 [0006]
[Problems to be solved by the invention]
However, even if the freezing is detected by detecting the pressure change at the heat exchanger inlet as in the technique disclosed in Japanese Patent Laid-Open No. 6-300398, whether the detected pressure fluctuation is caused by the freezing. It is difficult to instantly determine whether it is due to other factors.
In the technique disclosed in Japanese Patent No. 3087629, the ice generation detection sensor first detects a sudden temperature change from −2 ° C. to 0 ° C., so that the ice making determination means determines the start of the ice making operation, and the ice generation detection sensor. Calibration of the supercooling water temperature sensor is performed based on the indicated value, and when the supercooling water temperature sensor detects a sudden temperature change from -2 ° C to 0 ° C, the occurrence of freezing is detected. .
However, in this method, for example, when freezing occurs in the heat exchanger before the ice making determination means determines the start of the ice making operation, both the ice generation detection sensor and the cooling water temperature sensor change from −2 ° C. to 0 ° C. In order to detect a rapid temperature change, the freezing may be mistaken as the start of ice making operation.
[0007]
This invention is made | formed in view of this point, and when freezing generate | occur | produces in the heat exchanger which manufactures supercooled water, it aims at providing the technique which detects this rapidly and correctly. .
[0008]
Means to be Solved by the Invention
In order to achieve the above object, in the present invention, a heat exchanger for bringing water into a supercooled state, a closed system releaser for releasing supercooled water, an outlet of supercooled water from the heat exchanger, In an ice manufacturing apparatus having a connecting pipe connecting the inlet to the releaser, a bypass pipe connecting the upstream pipe of the water inlet of the heat exchanger and the connecting pipe is provided. Then, the flow rate or flow rate of water flowing through the upstream pipe and the flow rate or flow rate of water flowing through the bypass pipe are measured, and the flow rate or flow rate of the upstream pipe obtained by the measurement is increased per predetermined time. Freezing in the heat exchanger is detected based on a decreasing tendency and an increasing / decreasing tendency of the flow rate or flow rate of water flowing through the bypass pipe per predetermined time.
[0009]
During normal ice making or pre-cooling operation, the flow rate or flow rate of water flowing through the upstream pipe and bypass pipe of the heat exchanger water inlet is a certain value.
However, when freezing occurs in the heat exchanger, the flow resistance between the inlet and outlet of the heat exchanger increases because the water flow path in the heat exchanger is blocked by the phase change. As a result, the flow rate or flow velocity of the water flowing through the pipe upstream of the connection with the bypass pipe in the upstream pipe shows a decreasing tendency. At this time, since the pressure difference at the inlet and outlet of the heat exchanger increases, the flow rate or flow velocity of the water flowing through the bypass pipe tends to increase. Thus, when the flow rate or flow velocity of water flowing through the pipe upstream of the inlet of the heat exchanger decreases and the flow rate or flow velocity of water flowing through the bypass pipe increases, the flow rate fluctuation and flow velocity fluctuation are caused by freezing. It can be judged that it is.
[0010]
On the other hand, in the case of flow rate fluctuations and flow rate fluctuations due to factors other than freezing of the heat exchanger, the flow rate or flow rate of water flowing in the upstream pipe and the flow rate or flow speed of water flowing in the bypass pipe both show a decreasing trend. Both show an increasing trend. Furthermore, when the flow rate or flow rate of water flowing through the pipe upstream of the inlet of the heat exchanger increases and the flow rate or flow rate of water flowing through the bypass pipe decreases, it can be determined that the bypass pipe is clogged.
[0011]
Therefore, as in the present invention, the flow rate or flow rate of water flowing through the upstream pipe and the flow rate or flow rate of water flowing through the bypass pipe are measured, and the flow rate or flow rate of water in the upstream pipe obtained by the measurement is measured. It is possible to detect freezing in the heat exchanger by investigating the increasing / decreasing tendency of the flow rate per predetermined time and the increasing or decreasing tendency of the flow rate of water flowing through the bypass pipe or the flow velocity per predetermined time. is there. Further, according to the present invention, even when the operation is performed with the circulating flow rate of water being changed, it is possible to accurately determine the freezing without changing the set value or the like. Furthermore, errors in the flow meter and velocimeter (systematic error) do not affect the determination of freezing.
In addition, the measurement part of the flow rate and flow velocity of the upstream side pipe may be on the upstream side or the downstream side of the connection portion with the bypass pipe in the upstream side pipe. However, in the actual construction, considering the degree of freedom in the installation location, a device for measuring the flow rate and flow velocity is installed upstream of the connection with the bypass pipe in the upstream pipe, and the bypass pipe in the upstream pipe is installed. How to measure the flow velocity and the flow rate of water flowing to the upstream side of the pipe connection portion of the preferred.
[0012]
When a flow meter is used to measure the flow rate and examine its increasing / decreasing tendency, the flow meter has a “resolution” with respect to full scale, but in the present invention, the increasing / decreasing tendency per predetermined time is examined. Therefore, the measured value after a predetermined time, for example, 10 seconds after the first measurement, is compared with the first measured value, and the increase or decrease at that time may be examined. According to the resolution, when the flow rate is measured at a predetermined time, for example, every 10 seconds, for example, when a flow meter with a resolution of 1% is used, the flow rate is increased by about 1/100 of full scale. If there is a decrease, it may be determined as “increase or decrease” in the present invention.
[0013]
The object to be measured may be the flow rate or the flow rate of both the water flowing through the pipe upstream of the connection with the bypass pipe in the upstream pipe and the water flowing through the bypass pipe. The flow rate and the other one may be the flow rate.
[0014]
Furthermore, since the flow rate and flow rate of water flowing in the bypass pipe are determined by the differential pressure of the heat exchanger, the flow rate and flow rate of the water flowing through the upstream pipe are measured when water is flowed to a certain fixed value. If the flow rate and flow rate of water flowing in the bypass pipe are monitored, the flow rate and flow speed of water flowing in the bypass pipe increase as the heat exchanger becomes dirty. This also makes it possible to measure the contamination of the heat exchanger.
[0015]
If the connection pipe is provided with a propagation preventing means for preventing the supercooling release from propagating from the releaser to the heat exchanger side, the bypass pipe is connected to the upstream pipe at the inlet of the heat exchanger. It is preferable that the pipe is connected to the upstream side of the propagation preventing means in the pipe. Or you may make it connect with a propagation prevention means like embodiment mentioned later. The upstream side of the propagation prevention means is a place where supercooled water that does not undergo phase change flows, and thus water piping from the inlet to the outlet of the heat exchanger where phase change does not occur in normal ice making operation is provided. This is because, by connecting with the bypass pipe, it is possible to prevent the phase change in the supercooling releaser from giving disturbance to the measurement of flow rate and flow velocity, and to realize more accurate detection of freezing.
[0018]
Note that the connecting pipe in the present invention may not be a straight pipe, and may be partly divided as described later, for example.
[0019]
Further, according to the present invention, there are provided a heat exchanger for bringing water into a supercooled state, a closed system releaser for releasing supercooled water, an outlet of the supercooled water of the heat exchanger, and the releaser. In an ice manufacturing apparatus having a connecting pipe connecting an inlet, an external container that covers the outer periphery of the connecting pipe in a water-tight manner, a bypass pipe connecting the inside of the outer container and an upstream pipe of the inlet of the heat exchanger, and the upstream A first measuring device for measuring a flow rate or a flow velocity of water flowing in a pipe upstream of a connection portion with a bypass pipe in a side pipe, and a second measuring device for measuring a flow rate or a flow velocity of water flowing in the bypass pipe; There is also provided an ice manufacturing apparatus, wherein the connecting pipe is divided over the entire circumference through a gap in the outer container.
[0020]
In the ice manufacturing apparatus of the present invention having such a configuration, the water supplied at 0 ° C. or higher flowing through the bypass pipe to the upstream side pipe of the inlet of the heat exchanger is supplied to the entire inner wall surface of the connecting pipe. A liquid film of water of 0 ° C. or higher is formed on the entire inner wall surface of the connecting pipe on the downstream side. By this liquid film, it is possible to prevent the ice from adhering to the inner wall of the connecting pipe and the propagation of the phase change to the upstream side. Also, inside the liquid film of 0 ° C or higher formed on the wall surface, it will not grow even if ice nuclei are present, and will eventually melt or flow downstream. water does not phase change beyond the part that supplies propagates to the upstream side.
[0021]
And the 1st measuring device which measures the flow volume or flow velocity of the water which flows through the piping upstream of the connection part with the bypass pipe in the above-mentioned upstream piping, and the 2nd which measures the flow volume or flow velocity of the water which flows in the above-mentioned bypass pipe By examining the increasing / decreasing tendency per unit time of the flow rate or flow rate of water in the upstream pipe obtained by the measurement of the measuring device and the increasing / decreasing tendency per unit time of the flow rate or flow rate of water flowing through the bypass pipe, The judgment method described above makes it possible to detect freezing in the heat exchanger.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows an outline of an ice manufacturing apparatus 1 according to the present embodiment. A heat exchanger 2 performs heat exchange between a brine flowing in a brine transport pipe 3 and water flowing in a water pipe 4, and It has the function of turning water into supercooled water below ℃. In the brine transfer pipe 3, for example, brine of a predetermined temperature from a brine cooling means 5 such as a refrigerator flows through a brine pump 6 and circulates between the heat exchanger 2 and the brine cooling means 5. As the heat exchanger 2, various heat exchangers such as a plate type and a shell and tube type, and a supercooler can be used.
[0023]
Water taken from the ice heat storage tank 11 flows through the water pipe 4, and is heated to 0 ° C. or more, for example, about 0.5 ° C. by the preheating means 12, and then to the heat exchanger 2 by the water pump 13. Sent. Examples of the preheating means include an electric heater, a condenser of a refrigerator, and a heat exchanger that uses the heat of cooling water exiting the refrigerator. Then, after it is generated in the supercooling water at −2 ° C. or lower in the heat exchanger 2, the connecting pipe 14 (the supercooling heat exchanger and the supercooling release unit are connected, more specifically, the supercooling is connected). The outlet part of the heat exchanger for use and the inlet part of the subcooler are connected to the closed subcooler 15 where sherbet-like ice is produced. The supercooling release unit 15 used in the present embodiment has a function of canceling the supercooling state of the supercooling water that has flowed in through the connecting pipe 14, changing the phase to generate slurry-like ice, and discharging it to the outside. Have. As a trigger for canceling the supercooling, for example, an ultrasonic wave from an ultrasonic transducer is used. As this type of hermetic releaser 15, a known one can be used as appropriate.
[0024]
The connection pipe 14 is provided with a propagation preventing means 16 for preventing the freezing from propagating to the heat exchanger 2 side. As the propagation preventing means 16, in addition to the so-called divided connection pipe described later, a propagation preventing portion is constituted by a straight pipe as disclosed in, for example, Japanese Patent Laid-Open No. 2001-241705, and the flow rate of the supercooling water is determined. It is possible to propose that the supercooled water be circulated at a rate of 4 m / s or higher.
[0025]
The sherbet-shaped ice produced by the supercooling releaser 15 is sent to the secondary load 22 through the transfer pipe 21 and is sent to the ice heat storage tank 11 after the load treatment. Further, the transfer pipe 21 is connected to a transfer pipe 23 that directly communicates with the ice storage tank 11, and when the load is not treated by the secondary load 22, the sherbet-like ice produced by the supercooling release unit 15 is directly iced. It is sent to the heat storage tank 11 and is subjected to ice storage operation. The transfer pipes 21 and 23 are provided with corresponding flow rate adjusting valves 24 and 25, respectively, and the main pipes of the transfer pipes 21 and 23 are pumps (not shown) for pushing and transporting sherbet-like ice. ) Is provided.
[0026]
A bypass pipe 31 that bypasses the heat exchanger 2 is piped between the water pipe 4 upstream of the inlet of the heat exchanger 2 and the connecting pipe 14. In the present embodiment, the connecting portion between the bypass pipe 31 and the connecting pipe 14 is set on the upstream side of the propagation preventing means 16 in the connecting pipe 14.
[0027]
The bypass pipe 31 is provided with a first measuring device 32 such as a flow meter for measuring the flow rate of the water flowing in the bypass pipe 31, and on the upstream side of the connection with the bypass pipe 31 in the water pipe 4. A second measuring device 33 such as a flow meter is provided for measuring the flow rate of water flowing through the water pipe 4.
[0028]
The ice manufacturing device 1 according to the present embodiment has the above-described configuration, and the detection of the freezing of the heat exchanger 2 is performed at a predetermined time of the first measuring device 32 and the second measuring device 33. Based on the increasing and decreasing trend, the following judgment is made.
That is,
Increase in flow rate of the first measurement device 32, increase in flow rate of the second measurement device 33 → Flow rate fluctuation other than freezing Decrease in flow rate of the first measurement device 32, Decrease in flow rate of the second measurement device 33 → Flow rate fluctuation other than freezing The flow rate of the first measuring device 32 is increased, the flow rate of the second measuring device 33 is decreased, the flow rate of the frozen first measuring device 32 is decreased, the flow rate of the second measuring device 33 is increased, and the bypass pipe 31 is clogged. Here, the predetermined time means an interval for measuring the flow rate, and for the purpose of the invention, the shorter the time, the more instantaneous detection can be made. For example, a length of about 1 to 10 seconds can be proposed.
[0029]
In the above embodiment, the flowmeter for measuring the flow rate is used for both the first measuring device 32 and the second measuring device 33, but either or both of them measure the flow velocity of the water in the pipe. An anemometer may be used. The determination at that time is the same as in the case of the above flow meter, and the same determination method may be followed instead of replacing the flow rate with the flow velocity.
[0030]
Next, a reference example will be described. FIG. 2 shows an outline of the ice manufacturing apparatus 51 according to the reference example , and the members and apparatuses indicated by the same reference numerals shown in FIG. 1 are the same as the ice manufacturing apparatus 1 according to the first embodiment. The members and apparatus are shown. The ice manufacturing apparatus 51 according to the reference example does not include the bypass pipe 31 in the ice manufacturing apparatus 1 according to the first embodiment, and the first pressure measuring device 52 and the heat exchanger are provided on the inlet side of the heat exchanger 2. The second pressure measuring device 53 is provided on the two outlet sides.
[0031]
According to the ice manufacturing device 51 having such a configuration, the detection of the freezing of the heat exchanger 2 is performed based on the increasing and decreasing trends of the first pressure measuring device 52 and the second pressure measuring device 53 over the predetermined time. It is made with such a judgment.
Pressure rise of the first pressure measuring device 52, pressure rise of the second pressure measuring device 53 → pressure fluctuation other than freezing pressure drop of the first pressure measuring device 52, pressure drop of the second pressure measuring device 53 → freezing Pressure fluctuation other than the pressure rise of the first pressure measuring device 52, the pressure drop of the second pressure measuring device 53 → the pressure drop of the frozen first pressure measuring device 52, the pressure rise of the second pressure measuring device 53 → pressure Abnormal measurement device or reverse flow.
[0032]
As described above, according to the ice manufacturing apparatus 51 according to the reference example , the freezing of the heat exchanger 2 can be detected quickly and accurately based on the tendency of the pressure at the inlet / outlet of the heat exchanger 2 to increase or decrease. Moreover, it is not necessary to install bypass pipes, so it is only necessary to install pressure gauges at two locations with respect to existing equipment.
[0033]
Next, another embodiment will be described. FIG. 3 shows an outline of an ice manufacturing apparatus 61 according to another embodiment. In this embodiment, a so-called shell and tube configuration is used as a heat exchanger for generating supercooled water. The subcooler 62 having
[0034]
One end of the connecting pipe 14 is connected to the outlet side of the subcooler 62, that is, the discharge port 63 with a reduced diameter, and the other end of the connecting pipe 14 is connected to the hermetic supercooler 15. ing. One end of a bypass pipe 64 is connected to the downstream side of the water pump 13 in the water pipe 4, and the other end is connected to an external container 65 that covers the outer periphery of the connecting pipe 14 in a watertight manner.
[0035]
As shown in FIG. 4, the connecting pipe 14 is divided at right angles to the axial direction so as to create a gap d in the outer container 65, and is divided into an upstream connecting pipe 14a and a downstream connecting pipe 14b. It has been. Therefore, when water is fed from the bypass pipe 64 into the outer container 65, the water that has entered the connecting pipe 14 from the gap d flows along the wall of the downstream connecting pipe 14b along the flow in the connecting pipe 14 on the downstream side. A liquid film of water injected into the wall surface of the downstream connecting pipe 14b is formed. The pressure applied to the water flowing through the bypass pipe 64 by the water pump 13 is maintained up to the outer container 65, so there is no problem in pushing the water into the connecting pipe 3 from the gap d.
[0036]
A first measuring device 32 is provided on the upstream side of the connection portion of the water pipe 4 with the bypass pipe 64, and a second measuring device 33 is provided on the bypass pipe 64.
[0037]
The ice manufacturing apparatus 61 according to another embodiment has the above-described configuration, and the first measuring apparatus is performed by the same technique as the ice manufacturing apparatus 1 according to the first embodiment described above. The freezing of the subcooler 62 can be detected on the basis of the increase and decrease tendency of the flow rate due to 32 and the increase and decrease tendency of the flow rate due to the second measuring device 33.
[0038]
According to the ice manufacturing apparatus 61 according to the other embodiment, the outer container 65 can be used as a propagation preventing means by the combination of the bypass pipe 64 and the outer container 65 installed for determining whether the supercooler 62 is frozen. Function. That is, for example, when water at 0 ° C. is taken from the heat storage tank 11, the temperature is raised to 0.5 ° C. by the preheater 12. The water at 0.5 ° C. is cooled to, for example, a −2 ° C. supercooled state in the supercooler 62, and is sent to the supercooler 15 as it is through the connecting pipe 14. The state is released and, for example, 0 ° C. slurry-like ice is produced and continuously discharged to the outside.
[0039]
On the other hand, 0.5 ° C. water branched from the water pipe 4 and flowing into the bypass pipe 64 is poured into the outer container 65 and enters the connection pipe 14 from a divided portion of the connection pipe 14, that is, from the gap d. As it is, it flows downstream along the flow of supercooled water. At this time, since the air gap d extends over the entire circumference, the water at 0.5 ° C. flows along the wall surface of the inner wall of the downstream side connecting pipe 14b, and as a result, 0.5 ° C. over the entire wall surface. A liquid film of water is formed. In addition, the junction (water injection / accepting opening) of the bypass pipe 64 and the external container 65 is set with a predetermined distance by shifting the axis from the gap d. This is a configuration for uniformly injecting water from the entire wall surface.
[0040]
Therefore, even if the supercooling release performed in the supercooling releaser 15 is to propagate upstream along the wall surface, a liquid film of 0 ° C. or more is formed on the wall surface of the inner wall of the downstream connecting pipe 14b. , Propagation to the upstream side, that is, propagation to the subcooler 62 is prevented. Also, inside the liquid film of 0 ° C or higher formed on the wall surface, it will not grow even if ice nuclei exist, and will eventually melt or be flowed downstream by the flow of supercooled water. , The phase change does not propagate upstream beyond the outlet of the connecting pipe 14. Therefore, freezing at the outlet of the connecting pipe 14 and the subcooler 62 is prevented, and slurry-like ice can be produced continuously and stably.
[0041]
In addition, the system which cools the water which flows through the heat exchanger for supercooling is not ask | required. For example, the cooling may be performed by evaporating the refrigerant without using the brine.
[0042]
【Example】
Next, the result of the inventor actually performing the freeze detection method according to the present invention will be described. The basic configuration of the apparatus is as shown in FIG. 1, and the flow rate between the bypass pipe 31 and the water pipe 4 is measured and detected. The flow meter of the first measuring device 32 used in this experiment has a full scale of 100 [l / min] and a resolution of 1% [1 l / min], and the flow meter of the second measuring device 33 has a full scale. Of 2000 [l / min] and a resolution of 0.3% [6 l / min] were used. The measurement interval was 10 seconds (0.166 minutes). Therefore, if the absolute value of the product A × B of each flow rate deviation is less than 6, this is not a significant change.
That is, | A × B | ≧ 1 × 6 = 6.
Therefore, in the determination of freezing in this experiment, | A × B | is set to 15 or more in consideration of the influence of noise on the flow rate signal (in principle, it may be 6 or more as described above). . That is, when the value of | A × B |
[0043]
The measurement results are shown in the table of FIG. In addition, about the thing judged to be freezing, it shows by "*" in a table | surface, and the data from immediately after a measurement start to 222.0 minutes were abbreviate | omitted on account of drawing.
As can be seen from this result, it was determined that the temperature was frozen after 223.5 minutes from the measurement, and the examination revealed that the heat exchanger 2 was actually frozen. Prior to this time, the freezing condition was not satisfied, and the heat exchanger 2 was not actually frozen. Therefore, it was confirmed that the present invention can make a quick and accurate determination of freezing.
[0044]
【The invention's effect】
According to the present invention, when freezing occurs in a heat exchanger that produces supercooled water, it can be detected quickly and accurately. In addition, since the judgment is made based on the flow rate, flow velocity, or pressure increasing / decreasing tendency at two locations, even if the operation is performed with the circulating water flow rate changed, accurate freezing judgment can be made without changing the set value. Furthermore, even if there is an error (systematic error) in the flowmeter, flowmeter, or pressure gauge used to measure the flow rate, flow velocity, or pressure, the determination of freezing will not be affected.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a system of an ice making device according to a first embodiment.
FIG. 2 is an explanatory diagram showing a system of an ice making device according to a reference example .
FIG. 3 is an explanatory diagram showing a system of an ice making device according to another embodiment.
FIG. 4 is an explanatory diagram showing an internal state of a communication pipe of an ice making device according to another embodiment.
FIG. 5 is a table showing measurement results of Examples.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,51,61 Ice production apparatus 2 Heat exchanger 4 Water piping 14 Connection pipe 15 Supercooling release device 16 Propagation prevention means 31, 64 Bypass pipe 32 1st measuring device 33 2nd measuring device

Claims (5)

A heat exchanger for supercooling water, a closed system releaser for releasing supercooled water, and a connecting pipe connecting the outlet of the supercooling water and the releaser of the heat exchanger. In the ice production equipment,
Providing a bypass pipe connecting the upstream pipe of the water inlet of the heat exchanger and the connecting pipe;
Measure the flow rate or flow rate of water flowing through the upstream pipe and the flow rate or flow rate of water flowing through the bypass pipe,
Based on the increase / decrease tendency per unit time of the flow rate or flow rate of water in the upstream pipe obtained by the measurement and the increase / decrease trend per unit time of the flow rate or flow rate of water flowing through the bypass pipe, A method for detecting freezing in an ice production device, characterized by detecting freezing in an exchanger.   When the connection pipe is provided with a propagation preventing means for preventing the supercooling release from propagating from the releaser to the heat exchanger side, the bypass pipe is an upstream pipe at the inlet of the heat exchanger. 2. The method for detecting freezing of an ice manufacturing apparatus according to claim 1, wherein the pipe is connected to connect the upstream side of the propagation preventing means in the connecting pipe or the propagation preventing means. A heat exchanger for the water to a supercooled state, and a closed system of release device for releasing the supercooled state of water, and a connecting pipe connecting the inlet of said decompressor and outlet of supercooled water of the heat exchanger In the ice production equipment,
A bypass pipe connecting the upstream pipe of the inlet of the heat exchanger and the connecting pipe;
A first measuring device for measuring a flow rate or a flow velocity of water flowing through the upstream pipe;
A second measuring device for measuring the flow rate or flow velocity of water flowing in the bypass pipe;
An ice manufacturing apparatus characterized by comprising: Propagation preventing means for preventing the supercooling release from propagating from the releaser to the heat exchanger side is provided in the connecting pipe,
The bypass pipe is piped so as to connect an upstream pipe at an inlet of the heat exchanger and an upstream side of the propagation preventing means in the connecting pipe or the propagation preventing means. The ice manufacturing apparatus described in 1. A heat exchanger for supercooling water, a closed system releaser for releasing supercooled water, and a connecting pipe connecting the outlet of the supercooling water and the releaser of the heat exchanger. In the ice production equipment,
An external container that covers the outer periphery of the connecting pipe in a water-tight manner, and a bypass pipe that connects the inside of the external container and an upstream pipe at the inlet of the heat exchanger;
A first measuring device for measuring a flow rate or a flow velocity of water flowing through the upstream pipe;
A second measuring device for measuring a flow rate or a flow velocity of water flowing in the bypass pipe,
In the external container, the connecting pipe is divided over the entire circumference through a gap.

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