JP4532201B2 - How to operate an automatic ice machine - Google Patents

Description

  The present invention relates to an operation method of an automatic ice making machine that removes an ice block with hot gas supplied to an evaporator disposed in an ice making unit during a deicing operation.

  A spray type automatic ice making machine that continuously supplies ice making water by spraying ice making water from below into many ice making chambers that open downwards is suitable for use in facilities such as coffee shops and restaurants, and other kitchens. Yes. As shown in FIG. 5, in the ice making mechanism 10 of the automatic ice making machine, a large number of ice making chambers 12a open downward are defined in an ice making chamber (ice making section) 12 disposed horizontally in the main body. At the same time, an evaporator 14 communicating with a refrigeration circuit 24 including a compressor CM, a condenser CD, an expansion means EV, a fan motor FM and the like is closely and meanderingly arranged on the upper surface of the ice making chamber 12. A water dish 16 is pivotally supported via a support shaft 16a directly below the ice making chamber 12, and an ice making water tank 18 for storing a predetermined amount of ice making water is integrally formed at the lower part of the water dish 16. Provided.

  In the ice making mechanism 10, the ice making chamber 12 a is forcedly supplied by circulating and supplying vaporized refrigerant to the evaporator 14 in a state where the water tray 16 is held in a closed position where the ice making chamber 12 a is closed from below during ice making operation. The ice making water in the ice making water tank 18 is sprayed and supplied to the ice making small chamber 12a through the water tray 16 to generate ice blocks M in the small chamber 12a. When the first temperature detecting means TH1 disposed in the ice making chamber 12 detects the formation of the ice mass M, the ice making operation is shifted to the deicing operation, and hot gas is circulated and supplied to the evaporator 14 via the bypass circuit 26. Then, the ice making chamber 12 is heated, and the water tray 16 is tilted to the opening position obliquely downward about the support shaft 16a by the water tray opening / closing mechanism AM to open the ice making chamber 12a. In this deicing operation, the frozen portion of the ice making chamber 12a and the ice block M is melted by circulating supply of hot gas, and the ice block M separates from the ice making chamber 12a by its own weight and slides down on the water tray 16 in the open position. And stored in the stocker 22. The completion of detachment of the ice block M from the ice making chamber 12 is detected by the first temperature detecting means TH1, so that the deicing operation is shifted to the ice making operation, and the water tray 16 is again closed by the water tray opening / closing mechanism AM. It is configured to return to

For example, as an ice making device that performs deicing with hot gas, a pair of hot gas valves are inserted in parallel with a bypass circuit that supplies hot gas to the evaporator, and one of the hot gas valves is opened at the start of the deicing operation, A small amount of hot gas is supplied to the evaporator to melt the frozen part of the water dish and ice block, and then the other hot gas valve is opened after a lapse of time to supply a large amount of hot gas to the evaporator. There has been proposed a structure in which an icing portion between the ice and the ice block is melted (see Patent Document 1).
JP 61-8579 A

  By the way, in the deicing operation, the temperature of the hot gas supplied to the evaporator 14 also changes depending on the installation environment of the automatic ice making machine. For example, when the installation environment becomes a high temperature of about 35 ° C., the hot gas is 90 ° C. to The temperature may be as high as about 100 ° C. That is, by supplying high-temperature hot gas to the evaporator 14, the ice mass M rapidly melts, and the ice mass separated from the ice making chamber 12a and stored in the stocker 22 freezes and blocks. There is a risk of it. In addition, before the frozen portion between the water dish 16 and the ice block M is melted, the frozen portion between the ice making chamber 12a and the ice block M may be melted. In this case, the ice block M is frozen on the water plate 16. By leaving the ice tray 16 as it is tilted, the ice making chamber 12a is detached, and the generation of deformed ice or the erroneous detection that it has been completely deiced causes the ice block M to be caught. This leads to damage to the water pan 16 or the water tray opening / closing mechanism AM. In addition, the ice making chamber 12 cooled to below the freezing point rapidly rises with the supply of high-temperature hot gas, so that it is pointed out that the ice making chamber 12 is rapidly deteriorated due to a thermal shock. Further, since the hot gas exchanges heat with the ice making chamber 12 from the inlet side of the evaporator 14 in the process of flowing through the evaporator 14, the temperature of the hot gas flowing differs between the inlet side and the outlet side of the evaporator 14, The more hot the hot gas is supplied, the more the temperature distribution in the ice making chamber 12 becomes more uneven, the ice making chamber 12 cannot be heated uniformly, and the timing of detachment of the ice mass M is different, resulting in the detrimental effect of deicing efficiency. be pointed out. However, the ice making device disclosed in Patent Document 1 cannot cope with these adverse effects caused by high-temperature hot gas.

  That is, the present invention has been proposed in order to suitably solve these problems inherent in the operation method of the automatic ice making machine according to the prior art, and the ice making unit is heated uniformly and efficiently. An object of the present invention is to provide an operation method of an automatic ice making machine capable of performing the deicing operation.

In order to overcome the above-mentioned problems and achieve the intended purpose, an operation method of the automatic ice making machine according to the present invention is as follows.
An ice making unit having an evaporator communicating with a refrigeration circuit, and a water tray provided so that the ice making unit can be opened and closed . During ice making operation, a vaporized refrigerant is circulated and supplied to the evaporator, and the ice making unit is closed Ice making water is supplied from the pan to the ice making section to generate ice blocks. During the deicing operation, the hot gas valve inserted in the bypass circuit of the refrigeration circuit is opened to supply hot gas to the evaporator and the water pan is In the operation method of the automatic ice maker, in which the ice blocks are detached from the opened ice making unit by tilting ,
When the timer means has counted the closing time of the preset hot gas valve from the start of the deicing operation, vaporized by stopping the hot gas supply to the front Symbol evaporator by closing the hot gas valve performing a step of supplying a refrigerant, when the timer means counts an open time of the hot gas valve that is set in advance from closing of the hot gas valve, the hot gas supply to the evaporator by opening the hot gas valve once again A process,
The step of closing the hot gas valve and supplying the vaporized refrigerant to the evaporator is started at least between the start of tilting the water pan and the complete opening thereof.

According to the operation method of the automatic ice maker according to the present invention, simultaneously with the start of the deicing operation, the hot gas valve is opened and the closing time by the timer means is started, and the timer means counts the closing time. When the hot gas valve is closed, the hot gas supply to the evaporator is stopped and vaporized refrigerant is supplied. When the timer means counts the open time from the closing of the hot gas valve, the hot gas valve the by setting to again perform the hot gas supply to open to the evaporator, with can suppress excessive temperature rise of the ice making unit, because can evenly temperature rise across ice making unit, the generation of deformed ice By avoiding, the deicing efficiency can be improved. By setting the control unit to open and close the hot gas valve a plurality of times, the load on the compressor can be reduced. Further, by driving the fan motor in conjunction with the closing of the hot gas valve, the ice making unit to efficiently cool effectively suppress an excessive temperature rise of the ice portion, more improved deicing efficiency Can be made. Furthermore, a temperature detection means is provided in the bypass circuit, and the cooling operation during the deicing operation is performed only when the temperature detection means detects a set value or more, so that not only when the hot gas is at a high temperature. In addition, an efficient deicing operation can be performed by effectively using the temperature of the hot gas at a low temperature of the hot gas.

  Next, the operation method of the automatic ice making machine according to the present invention will be described below with reference to the accompanying drawings by giving a preferred embodiment. For convenience of explanation, the same reference numerals are used for the same elements as those of the automatic ice making machine shown in FIG.

  FIG. 1 is a schematic diagram showing an ice making mechanism 10 of an automatic ice making machine according to an embodiment and a refrigeration circuit 30 communicating with an evaporator 14 for cooling and heating an ice making chamber (ice making part) 12 of the ice making mechanism 10. The ice making mechanism 10 according to the embodiment is a so-called closed cell type, and is arranged horizontally inside the main body and includes an ice making chamber 12 having a large number of ice making chambers 12a opened downward, and the ice making chamber 12a can be opened and closed. It is basically composed of a water tray 16 that is closed and integrally includes an ice making water tank 18 that stores ice making water. On the upper surface of the ice making chamber 12, an evaporator 14 communicating closely with the refrigeration circuit 30 is closely arranged to circulate the vaporized refrigerant during ice making operation to forcibly cool the ice making chamber 12a and hot during deicing operation. Gas (high-temperature, high-pressure refrigerant) is supplied to promote the removal of the ice block M. The water tray 16 is pivotally supported by a support shaft 16a. The water tray 16 and the ice making water tank 18 are horizontally positioned during ice making operation and are held in parallel with the ice making chamber 12, and during ice removing operation. It is urged by a water tray opening / closing mechanism AM and tilts downward about the support shaft 16a to open the ice making chamber 12a. Further, ice making water is supplied to the ice making water tank 18 from a water supply pipe 20 having a water supply valve WV inserted therein, and during ice making operation, a pump motor PM communicated with the ice making water tank 18 is driven, thereby making an ice making chamber. Ice making water is supplied to each ice making chamber 12a from a water tray 16 that closes 12a.

  The refrigeration circuit 30 includes a compressor CM, a condenser CD, a fan motor FM, an expansion means EV, and the like disposed in a machine room (not shown) and an evaporator 14 disposed on the back surface of the ice making chamber 12. 32 is basically constructed. In the main circuit 32, devices are arranged so that the refrigerant circulates in the order of the compressor CM, the condenser CD, the expansion means EV, and the evaporator 14, and the devices are connected in communication by a refrigerant pipe 34. That is, the vaporized refrigerant compressed by the compressor CM is condensed and liquefied by the condenser CD via the refrigerant pipe 34, then depressurized by the expansion means EV, flows into the evaporator 14 and expands at once. Then, it evaporates and exchanges heat with the ice making chamber 12 to forcibly cool the ice making chamber 12 to below the freezing point. The vaporized refrigerant evaporated and heat-exchanged by the evaporator 14 repeats a cycle of returning to the compressor CM via the refrigerant pipe 34. The fan motor FM functions to cool the condenser CD.

  In addition to the main circuit 32 described above, the refrigeration circuit 30 includes a bypass circuit 40 that supplies hot gas to the evaporator 14 during the deicing operation. The bypass pipe 42 of the bypass circuit 40 has a start end connected to the refrigerant pipe 34 between the discharge side of the compressor CM and the suction side of the condenser CD, and the end thereof is a refrigerant pipe 34 on the suction side of the evaporator 14. It is connected to the. Further, a hot gas valve HV is inserted in the bypass circuit 40 so that the bypass circuit 40 can be opened and closed. As the hot gas valve HV, an electromagnetic valve, an electric valve or the like is preferably employed, but it is particularly limited as long as it can be arbitrarily operated (opening and closing of the bypass pipe 42) under the control of the control means C (see FIG. 2). In the ice making operation, the bypass pipe 42 is closed to interrupt the circulation of the refrigerant, and in the deicing operation, the bypass pipe 42 is opened based on the control of the control means C. Further, in the vicinity of the discharge side of the hot gas valve HV in the bypass pipe 42, second temperature detection means (temperature detection means) TH2 for detecting the temperature of the bypass pipe 42 is installed.

  The control means C includes a first temperature detection means TH1 disposed in the ice making chamber 12, and a timer means TM for measuring a predetermined time (closing time and opening time) in conjunction with opening and closing of the hot gas valve HV. And predetermined information is input from the second temperature detection means TH2 and the like disposed in the bypass pipe 42, and based on this input information and various settings input from a control panel (not shown), the compressor CM, the fan Control is performed to operate devices constituting the refrigeration circuit 30 such as the motor FM and the hot gas valve HV, and devices constituting the ice making mechanism 10 such as the water tray opening / closing mechanism AM, the pump motor PM, and the water supply valve WV (FIG. 2). That is, in the automatic ice making machine, operation switching such as switching from the ice making operation to the deicing operation when the ice making is completed, or switching from the deicing operation to the ice making operation due to the completion of the removal of the ice block M is performed by the first ice making temperature detecting means TH1. This is performed by the control means C based on the detected temperature of the ice making chamber 12.

  In the deicing operation, the automatic ice maker opens the hot gas valve HV for hot gas that is compressed by the compressor CM of the refrigeration circuit 30 and flows between the compressor CM and the condenser CD. As a result, the evaporator 14 is branched and supplied to the evaporator 14 via the bypass circuit 40, and the ice making chamber 12 is increased in temperature by increasing the temperature of the evaporator 14. At this time, by detecting the temperature of the bypass pipe 42 by the second temperature detection means TH2, the temperature of the circulating hot gas is detected. If the temperature of the hot gas is higher than a set value, the timer means TM When the timing is started, the hot gas valve HV is opened and closed a predetermined number of times, the process moves to a high temperature deicing process in which hot gas is intermittently supplied to the evaporator 14, and the temperature of the hot gas is lower than a set value. The timer means TM is not started, and the deicing operation is configured to shift to a normal deicing process in which hot gas is supplied to the evaporator 14 over the entire period. In the high temperature deicing step, when the timer means TM counts the closing time of the hot gas valve HV preset in the timer means TM, the hot gas valve HV opened at the same time as the deicing operation is started is closed. Thus, the supply of hot gas to the evaporator 14 is stopped and the vaporized refrigerant is supplied to the evaporator 14, and the timer means TM again starts counting the open time preset in the timer means TM. Yes. When the hot gas valve HV is closed, a cooling operation is performed by supplying vaporized refrigerant to the evaporator 14 via the main circuit 32. When the timer means TM counts the opening time, the hot gas valve HV is opened and hot gas is supplied to the evaporator 14 again.

  In the high temperature deicing process of the deicing operation, the hot gas valve HV is opened or closed by the control means C a predetermined number of times (in the embodiment, 2 times) in conjunction with the closing time and the opening time of the timer means TM. The hot gas is intermittently supplied to the evaporator 14. The opening / closing operation of the hot gas valve HV of the embodiment is performed until the water tray 16 is completely opened by the water tray opening / closing mechanism AM driven simultaneously with the start of the deicing operation (when the water tray opening / closing mechanism AM is driven downward). ), The closing time and opening time of the timer means TM and the number of times of opening and closing the hot gas valve HV are set. The opening / closing operation of the hot gas valve HV is not limited to when the water pan 16 is tilted downward, but may be performed until the temperature of the ice making chamber 12 becomes uniform. The closing time and opening / closing time are set in consideration of the size of the ice making chamber 12, the capacity of the refrigeration circuit 30, and the like, and the time for improving the deicing efficiency without applying a load to the compressor CM or the like of the refrigeration circuit 30. (For example, about 10 to 40 seconds).

  Further, the automatic ice maker is configured such that the fan motor FM is driven or stopped in conjunction with the hot gas valve HV opened and closed by the timer means TM in the high temperature deicing process of the deicing operation. That is, although the fan motor FM is stopped simultaneously with the start of the deicing operation, the fan motor FM is driven in conjunction with the closing of the hot gas valve HV and then stopped again in conjunction with the opening of the hot gas valve HV. (See FIG. 4).

(Effects of Example)
Next, the operation of the operation method of the automatic ice maker according to the embodiment will be described with reference to the flowchart of FIG. 3 and the timing chart of FIG. First, in the ice making operation, when the compressor CM and the fan motor FM are driven, the refrigerant circulates through the main circuit 32 in the refrigeration circuit 30, and the ice making chamber 12 is forcibly cooled by the vaporized refrigerant supplied to the evaporator 14. The The pump motor PM is driven to supply ice making water from the water tray 16 to the ice making chamber 12a, and ice blocks M are generated in the ice making chamber 12a (step S1). At this time, the hot gas valve HV is closed and the flow of the refrigerant to the bypass circuit 40 is blocked. In the ice making operation, when the first temperature detecting means TH1 detects a preset temperature, the ice making operation is completed and the operation proceeds to the deicing operation (step S2).

  When the deicing operation is started, the pump motor PM that has supplied the ice making water to the ice making chamber 12a and the fan motor FM that has cooled the condenser CD are stopped, and the hot gas valve HV is opened to open the evaporator. 14 is supplied with hot gas via the bypass pipe 42, and the water tray opening / closing mechanism AM is driven to urge the water tray 16 downward (step 3). When hot gas flows through the bypass pipe 42, the evaporator 14 is heated by the hot gas to gradually increase the temperature of the ice making chamber 12 whose temperature has dropped below the freezing point, and at the same time, the second temperature detecting means TH2 causes hot gas to flow. When the temperature of the hot gas is higher than a set value n ° C. (for example, n = about 50 ° C.), the process proceeds to a high temperature deicing process (step 4). When the process goes to the high temperature deicing step, the timer means TM starts counting the closing time while maintaining the fan motor FM stopped and the hot gas valve HV open (step 5). When the timer means TM counts the closing time, the hot gas valve HV is closed to stop the supply of hot gas to the evaporator 14, and the fan motor FM is driven to drive the condenser CD. Cooling is started (step 6). The timer means TM that has counted up the closing time starts counting the opening time that sets the opening timing of the hot gas valve HV.

  In step 6, when the hot gas valve HV is closed, the refrigerant circulates in the main circuit 32, and the cooling process is performed by the devices CM, CD, EV constituting the main circuit 32, and the vaporized refrigerant is supplied to the evaporator 14. Is supplied to cool the ice making chamber 12. At this time, by driving the fan motor FM in conjunction with the closing operation of the hot gas valve HV, the condenser CD is cooled and the cooling efficiency of the ice making chamber 12 by the evaporator 14 can be improved. That is, since the ice making chamber 12 can be cooled in a short time, the excessive heating state of the ice making chamber 12 due to the circulation of high-temperature hot gas is preferably released, and the temperature rise in the ice making chamber 12 can be made uniform, Since the closing time of the hot gas valve HV can be set short, the deicing operation as a whole can be shortened as compared with the case where the fan motor FM is not driven. Moreover, by operating the fan motor FM intermittently, the load on the compressor CM during the deicing operation can be reduced.

  By opening the hot gas valve HV based on the count of the opening time of the timer means TM, hot gas is supplied to the evaporator 14 and the ice making chamber 12 is heated again, and the fan motor FM is Stopped (step 7). Steps 6 and 7 are set to be repeated a predetermined number of times. If the number of repetitions is less than the set value, the timer means TM is reset (step 8), and then the process proceeds to step 5 again. Steps 6 and 7 are repeated. In the deicing operation, ice water is supplied to the water tray 16 from the water supply pipe 20 by opening the water supply valve WV for a predetermined time in order to melt the ice adhering to the water tray 16.

  In the high-temperature deicing process of the deicing operation, although the hot gas valve HV is opened and heated by the hot gas when deicing starts, the evaporator 14 is heated based on the counting up of the closing time by the timer means TM. The hot gas valve HV can be closed and cooled by the vaporized refrigerant supplied from the main circuit 32. In this way, by opening and closing the hot gas valve HV, the hot gas is not constantly supplied from the bypass circuit 40 to the evaporator 14, but intermittently supplying the hot gas to the evaporator 14. When the ice making chamber 12 is closed, the ice making chamber 12 is cooled by the vaporized refrigerant supplied to the evaporator 14 via the main circuit 32, and the temperature rise of the ice making chamber 12 heated excessively by the high-temperature hot gas can be mitigated. That is, the temperature of the ice making chamber 12 is not excessively increased, and the melting of the ice block M does not proceed rapidly, so that blocking of the ice blocks M released from the ice making chamber 12 and stored in the stocker 22 can be suppressed. At the same time, before the frozen state between the water dish 16 and the ice block M is released, the frozen state between the ice making chamber 12a and the ice block M is not released, which is caused by the generation of deformed ice or defective deicing. Occurrence of the ice mass M or the like can be avoided. In addition, the ice making chamber 12 cooled to below the freezing point can be prevented from suddenly rising in temperature, the ice making chamber 12 can be prevented from being deteriorated by a thermal shock, and the life of the ice making chamber 12 can be improved.

  By repeating the process of supplying the vaporized refrigerant after the hot gas to the evaporator 14 a plurality of times, an ice making chamber portion in contact with the region on the inlet side of the hot gas in the evaporator 14 and an ice making chamber portion in contact with the region on the outlet side The difference in temperature distribution between the two can be reduced, and a local rapid temperature increase can be suppressed. That is, since the ice making chamber 12 rises uniformly in temperature during the deicing operation, the melting of the iced portions of the ice making chambers 12a and the ice blocks M proceeds substantially simultaneously, and the timing of the removal of each ice block M is substantially the same. As a result, the ice block M can be prevented from biting, and the deicing time can be shortened to improve the deicing efficiency. Therefore, even if the temperature of the hot gas supplied to the evaporator 14 becomes high depending on conditions such as the installation environment, an efficient deicing operation can be performed.

  Moreover, since the closing time and opening time of the timer means TM can be arbitrarily set according to the installation environment of the automatic ice maker, the capacity of the refrigeration circuit 30, etc., the timing of opening and closing the hot gas valve HV according to various conditions And efficient deicing operation can be performed. Also, the number of times the hot gas valve HV is repeatedly opened and closed can be set so that no load is applied to the equipment such as the compressor CM and the deicing efficiency can be improved according to various conditions.

  Then, the ice block M is released from the ice making chamber 12a, and the first temperature detecting means TH1 detects the deicing completion temperature by the ice making chamber 12, whereby the deicing operation is completed, and the hot gas valve HV is closed, The fan motor FM is driven and the water tray opening / closing mechanism AM is driven to tilt the water tray 16 opened downward to close the ice making chamber 12a (step 11). Further, by opening the water supply valve WV, ice making water is supplied to the ice making water tank 18 through the water supply pipe 20, and the pump motor PM is driven to start the ice making operation (step 12).

  If the temperature detected by the second temperature detecting means TH2 is lower than the set value, the process moves to the normal deicing process (step 10). In this normal deicing process, the hot gas valve HV is opened until the first temperature detecting means TH1 detects the deicing completion temperature, and the hot gas valve HV is continuously connected to the evaporator 14 during the deicing operation. The fan motor FM is also stopped during the entire period of the deicing operation. Thus, an efficient deicing operation can be performed by selecting the deicing process according to the temperature of the hot gas (bypass pipe 42) detected by the second temperature detecting means TH2. That is, when the temperature of the hot gas is high (for example, about 90 to 100 ° C.), the temperature does not rise uniformly in the ice making chamber 12, and there is a problem such as generation of deformed ice due to excessive temperature rise. When the temperature of the gas is low (for example, 50 ° C. or lower), an excessive temperature rise is unlikely to occur in the ice making chamber 12, and the continuous heating of the ice making chamber 12 with hot gas is a relatively low hot gas. This is advantageous in reducing the deicing time and improving the deicing efficiency. Further, by detecting the temperature of the hot gas by the second temperature detecting means TH2, the refrigerant flow path (main circuit 32, bypass circuit 40) is determined according to the temperature rise accompanying the rise in refrigerant pressure and the installation environment. Therefore, there is an advantage that the load on the compressor CM can be reduced. Furthermore, since the second temperature detecting means TH2 is disposed in the vicinity of the discharge side of the hot gas valve HV in the bypass pipe 42, the temperature of the hot gas flowing through the bypass pipe 42 can be reliably detected.

In the embodiment, the fan motor FM is configured to be interlocked with the opening / closing operation of the hot gas valve HV in the deicing operation. However, the fan motor FM may not be driven during the deicing operation. The second temperature detecting means TH2 not essential also, when the transition to deicing operation from the ice-making operation can always adopted structure having a high temperature deicing step and starts counting the timer means T M. Further, when the hot gas valve HV is repeatedly opened and closed, the first temperature detecting means TH1 performs the deicing completion temperature or another set temperature (for example, a predetermined temperature that is lower than the deicing completion temperature and before the ice block falls). By repeating the process until it is detected, reliable deicing can be performed. Furthermore, although the opening and closing of the gas valve HV is set to be repeated a plurality of times (twice), the hot gas valve HV may be opened and closed once.

1 is a schematic view showing an automatic ice making machine according to a preferred embodiment of the present invention. It is a control block diagram of the automatic ice making machine of an Example. It is a flowchart figure which shows the deicing operation | movement of the automatic ice maker of an Example. It is a timing chart figure which shows the deicing operation | movement of the automatic ice maker of an Example. It is the schematic which shows the conventional automatic ice making machine.

Explanation of symbols

12 ice making room (ice making part), 14 evaporator, 30 freezing circuit, 40 bypass circuit,
M ice block, HV hot gas valve, C control means, TM timer means, CD condenser,
FM fan motor, TH2 second temperature detection means (temperature detection means)

Claims (4)

An ice making part (12) having an evaporator (14) communicating with the refrigeration circuit (30), and a water tray (16) provided so that the ice making part (12) can be opened and closed. 14) circulating the vaporized refrigerant and supplying ice- making water from the water tray (16) with the ice-making unit (12) closed to the ice-making unit (12) to generate ice blocks (M), deicing operation Sometimes by opening the hot gas valve (HV) inserted in the bypass circuit (40) of the refrigeration circuit (30) to supply hot gas to the evaporator (14 ) and tilting the water dish (16) , In the operation method of the automatic ice making machine so that the ice block (M) is detached from the opened ice making unit (12),
Timer means (TM) is preset hot gas valve closing time (HV) when counted from the start of the deicing operation, the hot gas valve (HV) before Symbol evaporator by closing ( a step of supplying a hot gas supply vaporized refrigerant is stopped to 14), the opening time of said timer means (hot gas valve TM) is pre-set from closing of the hot gas valve (HV) (HV) Counting, the hot gas valve (HV) is reopened to supply hot gas to the evaporator (14) ,
The step of closing the hot gas valve (HV) and supplying the vaporized refrigerant to the evaporator (14) starts at least from when the water pan (16) starts to tilt until it completely opens. A method for operating an automatic ice maker characterized in that: The control means (C) is set to open and close the hot gas valve (HV) multiple times in conjunction with the time of closing and opening of the hot gas valve (HV) by the timer means (TM). and,
The method for operating an automatic ice making machine according to claim 1 , wherein the opening time is set in a range of 10 seconds to 40 seconds . The hot gas valve (HV) is closed by counting the closing time of the hot gas valve (HV) by the timer means (TM), thereby stopping supply of hot gas to the evaporator (14) and evaporating refrigerant. And the step of supplying the hot gas to the evaporator (14) by reopening the hot gas valve (HV) by counting the open time of the hot gas valve (HV) by the timer means (TM). And between the start of tilting the water pan (16) until it is fully opened,
When the hot gas valve (HV) is closed in the deicing operation, the fan motor (FM) for cooling the condenser (CD) constituting the refrigeration circuit (30) is driven, and the hot gas valve (HV) The method for operating an automatic ice making machine according to claim 1 or 2, wherein the fan motor (FM) is set to stop when opened. The bypass circuit (40) is provided with a temperature detection means (TH2), and the hot gas for the evaporator (14) is provided only when the temperature detected by the temperature detection means (TH2) at the start of the deicing operation is higher than a set value. The operation method of the automatic ice making machine as described in any one of Claims 1-3 set so that the operation | movement which pauses supply of may be performed.

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