JP2019078468A - Ice maker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control an electronic expansion valve so as to have an appropriate opening even when the temperature of an ice-making portion fluctuates greatly due to ice-making water such as at the start of ice-making operation. An ice maker 10 expands a liquefied refrigerant that has been pressure-fed from a compressor 31 and liquefied by a condenser 32 by an electronic expansion valve 33 whose opening degree is controlled by a control device. The ice making section 11 is cooled by the heat of vaporization vaporized by the evaporator 34, and the ice making water sent by the water supply pump 25 is cooled by the cooled ice making section 11 while the unfrozen ice making water is cooled in the ice making water tank 21. The ice is collected and the ice making water is gradually frozen in the ice making section 11 to produce ice. When the ice making water in the ice making water tank 21 is started to be sent to the ice making section 11 by the water supply pump 25, the electronic expansion valve 33 The opening degree was controlled to be equal to or larger than a predetermined opening degree. [Selection diagram] Fig. 1

Description

  The present invention relates to an ice making machine in which an electronic expansion valve whose opening degree is controlled by a control device is adopted as an expansion valve of a refrigeration system for cooling an ice making unit.

  Patent Document 1 discloses an ice making machine that produces ice in an ice making unit. The ice making machine of Patent Document 1 comprises an ice making unit that freezes ice making water to produce ice, and an ice making water tank that stores ice making water that is circulated and supplied between the ice making unit; ice making unit in the ice making water tank. And a control device for controlling the operation of the refrigeration system and the water pump. The freezing apparatus of the ice making machine includes a compressor for compressing the refrigerant, a condenser for cooling and liquefying the refrigerant pumped from the compressor, and an electronic expansion valve for expanding the liquefied refrigerant liquefied by the condenser. An electronic expansion valve is used to vaporize the liquefied refrigerant expanded by the electronic expansion valve to cool the ice making section, and the liquefied refrigerant pressure-fed from the compressor and liquefied by the condenser is expanded by the electronic expansion valve to expand it. The ice making unit is cooled by the heat of vaporization of the liquefied refrigerant thus vaporized by the evaporator. In addition, an inlet temperature sensor and an outlet temperature sensor are provided at each of the refrigerant inlet and outlet of the evaporator in the ice making unit, and the control device comprises an inlet temperature sensor and an outlet temperature sensor. The opening degree of the electronic expansion valve is controlled from the difference between the two detected temperatures. In this ice making machine, the ice making water in the ice making water tank is jetted and delivered to the ice making unit cooled by the freezing apparatus by the water supply pump, and the ice making water delivered is cooled while circulating between the ice making water tank and the ice making unit. The ice making water freezes in the ice making unit and becomes ice.

JP 10-339533 A

  In the ice making machine of Patent Document 1 described above, the degree of opening of the electronic expansion valve is controlled based on the difference between the temperatures detected by the inlet temperature sensor and the outlet temperature sensor. When the load fluctuation such as when the ice making water in the ice making water tank is started to be delivered to the ice making unit at the start of the ice making operation is large, the opening degree of the electronic expansion valve is controlled based on the temperature difference between the temperatures detected by both temperature sensors. The response of the electronic expansion valve could not be controlled well. The present invention relates to an ice making machine in which the opening degree of the electronic expansion valve of the refrigeration system for cooling the ice making unit is controlled by the control device, and when the water making pump in the ice making water tank starts sending out the ice making water to the ice making unit. An object of the present invention is to make it possible to deliver a large amount of refrigerant with high responsiveness to the ice making unit.

  In order to solve the above problems, the present invention comprises an ice making water tank for storing ice making water that is supplied by circulating between an ice making unit that freezes ice making water to produce ice, and ice making water in an ice making water tank. A water pump for delivery to the ice making unit, a temperature sensor for detecting the temperature of the ice making unit, a compressor for compressing the refrigerant, a condenser for cooling and liquefying the refrigerant pumped from the compressor, and a condenser Control the operation of the water pump and the refrigeration system, including a refrigeration unit having an electronic expansion valve for expanding the liquefied refrigerant, and an evaporator for evaporating the liquefied refrigerant expanded by the electronic expansion valve to cool the ice making unit In the ice making operation including the control unit and producing ice in the ice making unit, the control unit controls the opening degree of the liquefied refrigerant pressure-fed from the compressor and liquefied in the condenser based on the detection temperature of the temperature sensor Inflated by the electronic expansion valve The ice making unit is cooled by the heat of vaporization of the liquefied refrigerant thus vaporized by the evaporator, and the ice making unit sent by the water pump is cooled by the ice making unit while the unfreezed ice making water is recovered by the ice making water tank The ice making machine is an ice making machine that gradually freezes the ice making water in the ice making unit to produce ice, and the delivery of the ice making water in the ice making water tank to the ice making unit by the water pump An ice making machine is provided which is controlled to have an opening degree or more.

  In the ice making machine configured as described above, when the load fluctuation at the time of cooling the ice making unit such as when the ice making water in the ice making water tank is started to be delivered to the ice making unit by the water pump Since the opening degree is controlled to be equal to or more than the predetermined opening degree, a large amount of refrigerant can be delivered with good responsiveness to the ice making unit, and the time of ice making operation, in particular, cooling of ice making water It was possible to prevent the time required from becoming unnecessarily long.

  In the ice making machine configured as described above, when the ice making operation is performed as the predetermined opening degree, the opening degree of the electronic expansion valve to be controlled when the temperature of the ice making unit becomes 0 ° C. or lower Is preferred. Also, the opening degree of the electronic expansion valve is controlled to be equal to or more than the predetermined opening degree after the ice making water in the ice making water tank is started to be delivered to the ice making unit by the water pump and the rise of the temperature detected by the temperature sensor stops It is preferable to do.

FIG. 1 is a schematic view of an ice maker according to the present invention. It is a block diagram of a control device.

  Hereinafter, an embodiment of an ice making machine of the present invention will be described using the drawings. As shown in FIG. 1, the ice making machine 10 closes a plurality of downward-opening ice making compartments 13 provided in the ice making unit 11 with a water plate 22 so as to be openable and closable. It is a so-called closed cell type ice making machine that jets water out and produces ice. The ice making machine 10 produces ice by alternately executing an ice making operation in which ice making water is frozen in the ice making unit 11 and a deicing operation in which the ice frozen in the ice making unit 11 is removed from the ice making unit 11. The electronic expansion valve 33 whose opening degree can be adjusted by the control of the control device 40 is adopted as the expansion valve of the freezing apparatus 30 which cools and heats the ice making unit 11.

  The ice making unit 11 is in the form of a shallow box having a horizontally-arranged lower surface opened, and a plurality of ice making compartments 13 are formed by the partition member 12. In addition, below the ice making unit 11, an ice storage 14 for storing the ice manufactured in each ice making chamber 13 is provided.

  The ice making machine 10 is provided with a water supply unit 20 for delivering ice making water to the ice making unit 11. The water supply unit 20 includes a water tray 22 integrally provided with an ice making water tank 21 at the lower part. The ice making water tank 21 stores ice making water that is circulated and supplied to the ice making unit 11. The water tray 22 is tiltably supported between a closed position where the ice making unit 11 approaches to the lower side of the ice making unit 11 to close the ice making chamber 13 and an open position where the ice making unit 13 is released away from the lower side of the ice making unit 11 It is done. The water tray 22 is provided with an open / close mechanism 23 for tilting between the closed position and the open position, and the water tray 22 opens / closes the ice making chamber 13 of the ice making unit 11 by the open / close mechanism 23. The opening and closing mechanism 23 includes an actuator motor 23a, and tilts the water pan 22 between a closed position and an open position by driving the actuator motor 23a.

  The water supply unit 20 is provided with a water supply means 24 for supplying ice making water to the ice making water tank 21 and a water feeding pump 25 for injecting and making the ice making water in the ice making water tank 21 to the ice making chamber 13. The water supply means 24 includes a water supply pipe 24a connected to the ice making water tank 21 and a water supply valve 24b interposed in the water supply pipe 24a, and the ice making water sent from the water supply pipe 24a is the ice making water tank by opening the water supply valve 24b. 21 is supplied. The ice making water supplied to the ice making water tank 21 is injected and delivered to the ice making chamber 13 by the water feeding pump 25.

  The ice making machine 10 includes a freezing device 30 that cools and heats the ice making unit 11. The refrigeration unit 30 expands the low-pressure liquefaction by expanding the compressor 31 which compresses the refrigerant, the condenser 32 which cools and liquefies the refrigerant pressure-fed from the compressor 31, and the liquefaction refrigerant liquefied in the condenser 32. The electronic expansion valve 33 as a refrigerant, and the evaporator 34 which vaporizes the liquefied refrigerant expanded by the electronic expansion valve 33 and cools the ice making unit 11 are provided. In the refrigeration apparatus 30, a compressor 31, a condenser 32, an electronic expansion valve 33, and an evaporator 34 are annularly connected by a refrigerant pipe to constitute a refrigeration circuit. The electronic expansion valve 33 is an expansion valve (electric expansion valve) whose opening degree can be adjusted by a control signal of a control device 40 described later. The evaporator 34 is disposed in a meandering manner on the upper surface of the ice making unit 11, and the ice making unit 11 is cooled by heat of vaporization when the liquefied refrigerant passing through the evaporator 34 is vaporized.

  In addition, the refrigeration system 30 includes a hot gas pipe (hot gas path) 35 for supplying hot gas to the evaporator 34 when performing deicing operation. The hot gas pipe 35 connects the downstream of the compressor 31 and the upstream of the evaporator 34 so as to lead the hot gas from the compressor 31 to the evaporator 34. A hot gas valve 36 is interposed in the hot gas pipe 35, and the hot gas sent from the compressor 31 is led to the evaporator 34 through the hot gas pipe 35 by opening the hot gas valve 36. During the deicing operation, when the hot gas is introduced to the evaporator 34 by opening the hot gas valve 36, the inside of the ice making compartment 13 of the ice making unit 11 is heated by the hot gas, and the ice frozen in the ice making compartment 13 is deiced. Be done.

  The ice making unit 11 is provided with a temperature sensor 37, and the temperature sensor 37 detects the temperature of the ice making unit 11. The temperature sensor 37 is not only used to control the opening degree of the electronic expansion valve 33 when performing an ice making operation, but also complete the ice making when performing an ice making operation and complete the deicing when performing an ice removing operation. Used to detect In this embodiment, although the temperature sensor 37 is provided at the central portion of the ice making unit 11, the present invention is not limited to this, and the temperature sensor 37 may be used as a refrigerant inlet of the evaporator 34 of the ice making unit 11 The temperature sensor 37 may be provided in the ice making water tank 21 to indirectly detect the temperature of the ice making unit 11 from the temperature of the ice making water. May be

  The ice making machine 10 includes a control device 40. As shown in FIG. 2, the control device 40 includes an actuator motor 23a of the open / close mechanism 23, a water supply valve 24b, a water pump 25, and a compressor 31 of the refrigeration system 30. , A hot gas valve 36 and a temperature sensor 37. The control device 40 has a microcomputer (not shown), and the microcomputer has a CPU, a RAM, a ROM and a timer (all not shown) connected respectively via a bus. The control device 40 performs an ice making program which repeatedly executes an ice making operation of freezing ice making water in the ice making unit 11 to produce ice and a deicing operation of making ice frozen in the ice making unit 11 by the ice making operation. Have.

  Next, the ice making program of the ice making machine 10 will be described. At the start of the ice making machine 10, the deicing operation is preliminarily carried out, and it is assumed that ice is not always left in the ice making compartment 13 of the ice making unit 11. In the deicing operation, the hot gas valve 36 is opened in a state where the compressor 31 is operated, and the water pan 22 is tilted to the open position by the actuator motor 23a of the open / close mechanism 23. The hot gas delivered from the compressor 31 is led to the evaporator 34 through the hot gas pipe 35 to heat the ice making compartments 13 of the ice making unit 11. When the temperature detected by the temperature sensor 37 reaches 5 ° C. or higher as a predetermined temperature for detecting completion of deicing, the control device 40 does not have ice remaining in the ice making compartment 13 of the ice making unit 11, that is, deicing is complete. And the hot gas valve 36 is closed. When the hot gas valve 36 is closed, the refrigerant pressure-fed from the compressor 31 does not pass through the hot gas pipe 35 and is sent to the condenser 32 so that the liquefied refrigerant liquefied by the condenser 32 has electronic expansion. The expansion is performed by the valve 33 to be a low pressure liquefied refrigerant, and the low pressure liquefied refrigerant is vaporized by the evaporator 34 to cool the ice making unit 11. Further, the controller 40 tilts the water tray 22 to the closing position by the actuator motor 23a of the opening / closing mechanism 23 and supplies the ice making water to the ice making water tank 21 by opening the water supply valve 24b. When the ice making water tank 21 reaches a predetermined water level, the control device 40 closes the water supply valve 24 b to end the water supply.

  After performing the deicing operation in advance in the ice making unit 11, the control device 40 repeatedly executes the ice making operation and the deicing operation in the ice making unit 11. As described above, when the hot gas valve 36 is closed, the refrigerant pressure-fed from the compressor 31 is liquefied by the condenser 32 to become a liquefied refrigerant, and the liquefied refrigerant is expanded by the electronic expansion valve 33 to become a low pressure liquefied refrigerant It is then sent to the evaporator 34 of the ice making unit 11. At this time, since it is not necessary to cool the ice making water until the water making pump 11 starts delivering the ice making water to the ice making unit 11, the load required to cool the ice making unit 11 is small. The opening degree of the valve 33 is smaller than the middle between the maximum and the minimum, and specifically, the opening degree equivalent to the opening degree of the electronic expansion valve 33 controlled when the temperature of the ice making unit 11 becomes 0 ° C. or less It is controlled to become. As described above, when the load required to cool the ice making unit 11 is small, the opening degree of the electronic expansion valve 33 is squeezed to be small, and the ice making unit 11 is quickly cooled by the low temperature refrigerant. .

  In the ice making operation, with the ice making unit 11 sufficiently cooled as described above, the ice making water in the ice making water tank 21 is started to be delivered to the ice making compartments 13 of the ice making unit 11 by the water supply pump 25. The temperature of the ice making water in the ice making water tank 21 is not low because it is before it is circulated between the ice making unit 11 and the load for cooling the ice making water in the ice making unit 11 is high. If the temperature of the ice making unit 11 becomes 0 ° C. or less when the ice making water is started to be supplied to the ice making unit 11, the refrigerant is sent to the ice making unit 11 with the same opening degree of the electronic expansion valve 33 to be controlled. The refrigerant necessary for cooling may not be delivered to the entire ice making unit 11. Moreover, although it is necessary to send many refrigerants to the ice making unit 11, if the opening degree of the electronic expansion valve 33 is controlled based on the temperature detected by the temperature sensor 37, the opening degree of the electronic expansion valve 33 is responsive There is a possibility that it can not be controlled. Therefore, when the controller 40 of the ice making machine 10 starts the delivery of the ice making water in the ice making water tank 21 to the ice making compartments 13 of the ice making unit 11 by the water feeding pump 25, the opening degree of the electronic expansion valve 33 is predetermined. The opening degree is controlled to be larger than the opening degree of the electronic expansion valve 33 which is controlled when the temperature of the ice making unit 11 becomes 0 ° C. or lower. Thus, when the ice making water in the ice making water tank 21 is started to be delivered to the ice making chamber 13 of the ice making unit 11 by the water feeding pump 25, the opening degree of the electronic expansion valve 33 is sufficiently based on the detection temperature of the temperature sensor 37. It became possible to send out a large amount of refrigerant with good responsiveness to the ice making unit 11 by controlling at an opening degree at which the refrigerant can be sent out.

  Also, as described above, the electronic expansion valve 33 is opened by a predetermined degree until the start of delivery of the ice making water in the ice making water tank 21 to the ice making unit 11 by the water supply pump 25 and the rise of the temperature detected by the temperature sensor 37 is stopped. By controlling as described above, a large amount of refrigerant is responsively delivered to the ice making unit 11 until the ice making water in the ice making water tank 21 is sufficiently cooled, and the ice making water in the ice making water tank 21 is cooled. To reduce the time it takes to The ice making water in the ice making water tank 21 circulates between the ice making unit 11 and is gradually cooled, and in order to freeze the ice making water in the ice making chamber 13 of the ice making unit 11, the evaporator 34 of the ice making unit 11 is used. It is necessary to lower the temperature of the ice making unit 11 to lower the temperature of the ice making unit 11 by increasing the degree of superheat by suppressing the flow rate of the refrigerant to be sent. Therefore, when the ice making water in the ice making water tank 21 is cooled to a certain extent and the temperature detected by the temperature sensor 37 starts to decrease, the opening degree of the electronic expansion valve 33 is controlled to be small. Thereafter, the control device 40 controls the opening degree of the electronic expansion valve 33 to be gradually decreased based on the temperature detected by the temperature sensor 37 to freeze the ice making water in the ice making chamber 13 of the ice making unit 11. Let In particular, when the detection temperature of the ice making unit 11 detected by the temperature sensor 37 becomes 0 ° C. or lower, the load for cooling the ice making water in the ice making unit 11 is small. By narrowing the opening degree, the ice making unit 11 is cooled so that the ice making water is frozen by the refrigerant whose opening degree is reduced and the temperature is lowered.

  The ice making unit 11 is cooled in a state where the opening degree of the electronic expansion valve 33 is controlled based on the temperature detected by the temperature sensor 37, and ice making water jetted out from the ice making water tank 21 is gradually frozen in the ice making chamber 13 The ice making water in the ice making water tank 21 gradually decreases. At this time, if the opening degree of the electronic expansion valve 33 is controlled so that the detection temperature of the temperature sensor 37 becomes −5 ° C. to −15 ° C., it is possible to manufacture ice with a high degree of transparency with few cracks. As detection of the completion of ice making based on the temperature detected by the temperature sensor 37, a unit which is the product of the temperature detected by the temperature sensor 37 and the unit time detected every unit time from when the temperature of the ice making unit 11 reaches 0 ° C. The integrated value is obtained, and when the addition total value obtained by sequentially adding these unit integrated values becomes the target integrated value, the control device 40 detects that the block-shaped ice is formed in the ice making compartment 13 and the ice making is completed. The driving of the water supply pump 25 is stopped to end the ice making operation. Note that, by increasing the opening degree of the electronic expansion valve 33 from the timing immediately before the completion of ice making, it is possible to suppress that the frozen ice sticks in the ice making compartments 13.

  In the deicing operation after the ice making operation, the control device 40 opens the hot gas valve 36 in a state where the compressor 31 is operated, and tilts the water tray 22 to the open position by the actuator motor 23a of the open / close mechanism 23. The hot gas delivered from the compressor 31 is led to the evaporator 34 through the hot gas pipe 35 to heat the ice making compartments 13 of the ice making unit 11. The temperature of the ice making unit 11 at the time of completion of ice making is approximately −20 ° C., but the ice separates from the inside of the ice making chamber 13 while the temperature of the ice making unit 11 gradually rises. When the temperature detected by the temperature sensor 37 reaches 5 ° C. or higher as a predetermined temperature for detecting completion of deicing, the control device 40 does not have ice remaining in the ice making compartment 13 of the ice making unit 11, that is, deicing is complete. It is detected that the hot gas valve 36 is closed, the deicing operation is ended, and the ice making operation is performed again as described above. As described above, by repeatedly executing the ice making operation and the deicing operation by the control device 40, block-shaped ice is continuously produced in the ice making unit 11.

  In the ice making machine 10 configured as described above, the ice making unit 11 is provided with the temperature sensor 37, and the ice making unit 11 is provided with the electronic expansion valve 33 whose opening degree is controlled based on the temperature detected by the temperature sensor 37. It is cooled by the device 30. The ice making water in the ice making water tank 21 circulates between the ice making unit 11 cooled by the freezing device 30 and is cooled, and the ice making water is gradually frozen in the ice making chamber 13 of the ice making unit 11 to form ice.

  When the ice making water in the ice making water tank 21 is started to be delivered to the ice making compartments 13 of the ice making unit 11 by the water supply pump 25, the temperature of the ice making water in the ice making water tank 21 is before circulating between the ice making unit 11 and the temperature. As a result, it was newly found that it is necessary to send a large amount of refrigerant to the evaporator 34 of the ice making unit 11 because For this reason, in the ice making machine 10, when the control device 40 starts sending the ice making water in the ice making water tank 21 to each ice making chamber 13 of the ice making unit 11 by the water feeding pump 25, the opening degree of the electronic expansion valve 33 The opening degree is controlled to be larger than the opening degree of the electronic expansion valve 33 which is controlled when the temperature of the ice making unit 11 becomes 0 ° C. or less. As a result, when the ice making water in the ice making water tank 21 is started to be sent out to the ice making unit 11 by the water feeding pump 25, it becomes possible to send out a large amount of refrigerant with good responsiveness to the ice making unit 11, It was possible not to unnecessarily lengthen the time, in particular the time required to cool the ice-making water.

  In addition, as described in Patent Document 1, in the ice making machine in which the opening degree of the electronic expansion valve is controlled using two temperature sensors that detect the temperatures of the inlet and the outlet of the ice making unit, the two temperatures are Not only the cost required for parts is high by using a sensor, but when the load fluctuation of the ice making unit is large, the opening degree of the electronic expansion valve is finely controlled based on the temperature difference between these two temperature sensors. However, expensive control devices have to be used, and the cost for parts has been further increased. On the other hand, in this ice making machine 10, even when the load fluctuation of the ice making unit 11 is large, such as when ice water is started to be supplied to the ice making unit 11, responsiveness to the ice making unit 11 is not based on detection by the temperature sensor. Since many refrigerants can be delivered well, cost reduction can be realized.

  Also, as described above, the electronic expansion valve 33 is opened by a predetermined degree until the start of delivery of the ice making water in the ice making water tank 21 to the ice making unit 11 by the water supply pump 25 and the rise of the temperature detected by the temperature sensor 37 is stopped. Since it controlled by the above, until the ice making water in the ice making water tank 21 is fully cooled, a large amount of refrigerant can be sent out with good responsiveness to the ice making unit 11.

  In the ice making machine of this embodiment, a large number of ice making compartments 13 opened downward in the ice making unit 11 are closed freely openable and closable by the water tray 22, and the ice making water is jetted and supplied from the water tray 22 to each ice making compartment 13. The present invention is a so-called closed cell type ice making machine for producing dry ice, but the present invention is not limited to this, and a so-called open cell type ice making machine for making ice by injecting ice making water with the ice making chamber open. The ice making machine may be a flow down type ice making machine in which the ice making compartment is opened horizontally and the ice making water is allowed to flow down into the ice making compartment, or the ice making water is allowed to flow down the ice making plate which is vertically erected. It is also good.

  DESCRIPTION OF SYMBOLS 10 ... Ice making machine, 11 ... Ice making part, 21 ... Ice water tank, 25 ... Water supply pump, 31 ... Compressor, 32 ... Condenser, 33 ... Electronic expansion valve, 34 ... Evaporator, 37 ... Temperature sensor, 40 ... Control apparatus.

Claims (3)

An ice making unit that freezes ice water to produce ice;
An ice making water tank for storing ice making water to be circulated and supplied between the ice making unit;
A water pump for delivering ice making water in the ice making water tank to the ice making unit;
A temperature sensor for detecting the temperature of the ice making unit;
A compressor for compressing the refrigerant, a condenser for cooling and liquefying the refrigerant pressure-fed from the compressor, an electronic expansion valve for expanding the liquefied refrigerant liquefied in the condenser, and expansion by the electronic expansion valve A refrigeration unit having an evaporator for vaporizing the liquefied refrigerant to cool the ice making unit;
And a controller for controlling the operation of the water pump and the refrigeration system.
In the ice making operation of producing ice in the ice making unit, the control device controls the opening degree of the liquefied refrigerant pressure-fed from the compressor and liquefied in the condenser based on the temperature detected by the temperature sensor. The ice making section is cooled by the heat of vaporization of the liquefied refrigerant expanded by the electronic expansion valve and vaporized by the evaporator.
Ice making is performed by collecting unfrozen ice making water in the ice making water tank while cooling the ice making water delivered by the water pump in the cooled ice making unit and gradually freezing the ice making water in the ice making unit to produce ice Machine,
An ice making machine characterized in that when the ice making water in the ice making water tank is started to be delivered to the ice making unit by the water feeding pump, the opening degree of the electronic expansion valve is controlled to be a predetermined opening degree or more. In the ice making machine according to claim 1,
An ice making machine characterized in that the predetermined opening degree is an opening degree that is larger than the opening degree of the electronic expansion valve controlled when the temperature of the ice making unit becomes 0 ° C. or lower when the ice making operation is performed. . In the ice making machine according to claim 1 or 2,
When the ice making water in the ice making water tank is started to be delivered to the ice making unit by the water feeding pump, and until the rise of the temperature detected by the temperature sensor is stopped, the opening degree of the electronic expansion valve is not less than the predetermined opening degree An ice maker characterized by being controlled to be

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