JP4845843B2 - Ice machine - Google Patents

Description

  The present invention relates to a so-called reverse cell type ice making machine including a cooler in which a large number of ice making chambers opening downward are defined and a tiltable water tray that closes each ice making chamber.

  This type of conventional ice making machine, in particular, a reverse cell type ice making machine, stores an ice making unit in a main body made of a heat insulating box, and an ice door that can be opened and closed on the front side. It consisted of the ice storage we had and the machine room. The ice making unit includes a cooler in which a large number of ice making chambers opened downward are formed, and a tiltable water tray that closes each ice making chamber below the cooler. Then, in a state where the ice tray closes the ice making chamber, the high-temperature and high-pressure refrigerant discharged from the compressor provided in the machine chamber is condensed by the condenser, decompressed by the decompression device, and then flows into the cooler. The ice making chambers are cooled to cool the ice making chambers, and the ice making water stored in the water tank is sprayed into the ice making chambers from the fountain holes formed on the surface of the water pans by a circulation pump. However, in a state where each ice making chamber is opened, the high-temperature and high-pressure refrigerant from the compressor is flowed to the evaporator, heated to perform an ice removing process, and the ice desorbed from each ice making chamber is stored in an ice storage. It was.

Further, the tilting movement of the water pan is controlled by a driving device having a high speed gear ratio reduction motor capable of forward and reverse rotation. And the position of the said water pan was detected by the contact-type water pan position detection switch attached to the mounting plate fixed to the support beam. That is, one end of the arm of the drive cam attached to the output shaft of the reduction motor contacts this switch at the inclined open position, and the other end contacts the switch at the horizontal closed position and is turned on and off. This is a method of detecting each position (see, for example, Patent Document 1).
JP-A-10-332236

  However, the above-described conventional water pan position detection switch is a mechanical system that detects the position of the water pan when both ends of the arm of the drive cam are alternately in contact with the switch and switched on and off. For this reason, there is a problem that the switch cannot be switched at a desired position due to an error when the water pan position detection switch is assembled. In addition, there is a problem that the arm does not operate even if it comes into contact. When such a switching failure occurs, for example, the water pan moves backward to close the ice making chamber, but the motor further rotates in the backward movement direction (the closing direction). In addition, there was a risk of overloading and structural parts, leading to failure. In addition, there are cases where the movement of the water dish cannot be properly determined.

  The present invention has been made in order to solve the conventional technical problems, and an object thereof is to provide an ice making machine capable of controlling the opening and closing of a water tray more accurately.

The ice making machine of the present invention includes a cooler in which a large number of ice making chambers opening downward are defined, and a tiltable water tray that closes each ice making chamber, and the water tray closes the ice making chamber. In the horizontal blockage position, the ice trays are fountained into the ice making chambers from the water trays, and the ice trays are opened by heating the cooler at a predetermined inclined opening position where the water trays open the ice making chambers. And a motor for tilting the water pan, and a non-contact type water pan position detecting means for detecting a horizontal closing position and an inclination opening position of the water pan, the water pan position detecting means, A magnet that moves with the tilting movement of the water pan, and a magnetic reaction element that reacts to the magnetic lines of force of the magnet at the horizontal closed position and the tilt open position of the water tray, respectively, and the magnet is attached to the output shaft of the motor And the magnetic reaction element to the motor around the output shaft. Ri attached, even after a lapse of a predetermined time from the control for the backward operation from the inclined open position the water tray by driving the motor is the water tray position detecting means determines that said water tray is in the tilted open position In this case, the microcomputer for controlling the operation of the ice making machine is restarted, and when the number of restarts reaches a predetermined number, the ice making machine is stopped and a control means for giving an alarm is provided. Features.

  The ice making machine of the invention of claim 2 is characterized in that, in the above invention, the end of the water dish is connected to an arm attached to the output shaft of the motor, and the magnet is attached to the arm.

According to the present invention, there are provided a cooler in which a large number of ice making chambers opening downward are formed, and a tiltable water tray that closes each ice making chamber, wherein the water tray closes the ice making chamber. A so-called reverse cell in which the ice tray is fountained from the water tray into the ice making chamber at the horizontal blocking position, and the ice tray is opened by heating the cooler at a predetermined inclined open position where the water tray opens the ice making chamber. Type ice making machine has non-contact type water pan position detection means for detecting the horizontal blocking position and the tilt opening position of the water tray, compared with the case of using a conventional contact type water tray position detection switch. In addition, it is possible to more accurately control the opening and closing of the water pan, and it is also possible to prevent malfunctions due to water immersion. In addition, it is possible to reduce the installation space and the number of parts and reduce the manufacturing cost.
Also, by attaching a magnet to the motor output shaft that tilts the water pan and attaching a magnetic reaction element to the motor around the output shaft, wiring becomes easy, improving assembly workability and reducing assembly errors. The occurrence of the accompanying malfunction can be effectively avoided.
Further , a water pan position detection comprising a magnet that moves with the tilting movement of the water pan driven by a motor, and a Hall element that reacts to the magnetic lines of force of the magnet at the horizontal closed position and the tilt open position of the water dish, respectively. Means for driving the motor so that the water pan moves backward from the tilt open position, and the water pan position detecting means has the water pan in the tilt open position even after a predetermined time has elapsed. When it is judged, the microcomputer for controlling the operation of the ice making machine is restarted, and when the number of restarts reaches a predetermined number, the ice making machine is stopped and a control means for giving an alarm is provided. Therefore, after the water tray has started moving backward from the tilt opening position, the control means has detected an abnormality if the water tray position detection means has detected the tilt opening position of the water dish even after a predetermined time has elapsed. Judgment Runode, for some reason, such as failure of the reduction motor, so that the abnormal water dish would be longer remains tilted open position can not be backward to accurately detect can be addressed. Also, at that time, if the number of restarts reaches a predetermined number, the control means does not restart after stopping the operation and activates an alarm. If an abnormality leading to a serious failure has occurred, further operation can be stopped to prompt repair.

  And in this invention, since the magnet was attached to the arm attached to the output shaft of the motor and connected to the other end of the water dish, it becomes possible to use the magnet mounting tool in the arm as well. Reduction can be achieved.

  An object of the present invention is to accurately detect the position of a water dish of a so-called reverse cell type ice making machine and to control the opening and closing of the water dish more accurately. The purpose of accurately controlling the opening and closing of the water pan was realized by providing a non-contact type water pan position detecting means for detecting the horizontal closed position and the inclined open position of the water tray. Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 is a front view of an ice making machine I according to an embodiment of the present invention, FIG. 2 is a side view of the ice making machine I, and FIG. 3 is an electric circuit diagram of a control device 20 of the ice making machine I. The ice making machine I according to the embodiment includes a heat insulating door 4 that can be opened and closed on the front surface of a main body 3 formed of a heat insulating box, and an ice storage S is configured in the main body 3 closed by the heat insulating door 4. An ice making unit IU is arranged in the main body 3 at the upper part of the ice storage S, and a machine room M in which a compressor 21, an auxiliary condenser 41, a condenser 42 and the like of the cooling device R, which will be described later, are housed is configured in the lower part. Has been.

  The ice making machine I of the embodiment includes an ice making unit IU having a cooler 1 in which a large number of ice making chambers 1A opening downward are partitioned and water trays 5 closing each ice making chamber 1A. At a predetermined horizontal closing position that closes the ice making chamber 1A, water is sprayed from the water tray 5 to each ice making chamber 1A to perform an ice making process, and the cooler 1 is opened at a predetermined inclination opening position where the water tray opens the ice making chamber 1A. It is a so-called reverse cell type ice making machine that performs an ice removing process by heating. Here, the configuration of the ice making unit IU will be described in detail with reference to FIGS. 4 is a side view of the ice making unit IU of the ice making machine I in a state where the water tray is in the horizontally closed position, and FIG. 5 is a diagram illustrating a reduction motor 10 as a motor of the ice making unit IU in FIG. 4 and an output shaft 10A of the reduction motor 10. FIG. 6 is a front view of the reduction motor 10 with the arm of FIG. 5 removed, and FIG. 7 is an enlarged view of FIG. 8 is a side view of the reduction motor 10 of FIG. 6, and FIG. 9 is a plan view of the reduction motor 10 of FIG.

  The ice making unit IU includes the ice making chambers 1A, the cooler 1 provided with the evaporation pipe 2 of the cooling device R on the outer surface of the ice making chamber 1A, and the ice making chambers 1A at the predetermined horizontal closing positions as shown in FIG. The water tray 5 is formed with fountain holes and return holes (not shown) corresponding to the ice making chambers 1A on the surface, and a water tank 6 fixed to the water tray 5 and communicating with the return holes. The water in the water tank 6 through the water supply pipe 7 and further through a distribution pipe (not shown), the circulation pump 9 for circulating the water to each ice making chamber 1A, and the forward / reverse rotation for tilting and returning the water tray 5 A drive unit 11 as a drive means having a reduction motor 10 with a high gear ratio possible, a sprinkler 13 for sprinkling water on the surface of the water tray when the water supply electromagnetic valve 12 is opened, and a float provided in the water tank 6 Operates and detects the predetermined full water level of the water tank 6 That consists in the water level switch WLSW and the like.

The speed reduction motor 10 is supported by a mounting plate 16 fixed to a support beam 15, and the output shaft 10A of the speed reduction motor 10 has arms extending in opposite directions in the radial direction of the output shaft 10A. A drive cam 17 having a first arm 17A and a second arm 17B is attached. One end of a coil spring 18 (FIG. 12) is attached to the end of the first arm 17 </ b> A of the drive cam 17, and the other end of the coil spring 18 is connected to the side surface of the other end of the water dish 5. . As a result, the other end of the water dish 5 is connected to the end of the first arm 17 </ b> A via the coil spring 18. Further, one end of the water dish 5 is pivotally supported by the support beam 15 via a rotation shaft 19. Note that the base side of the output shaft 10A is cut off at one side when facing the axial direction, and the cross section is substantially D-shaped.

  Reference numeral 30 denotes a water pan position detection switch as a non-contact type water pan position detecting means for detecting a predetermined horizontal blocking position and a tilt opening position of the water tray 5. The water pan position detection switch 30 includes a magnet 32 that moves with the tilting movement of the water pan 5, and a magnetic reaction element 33 that reacts to the magnetic lines of force of the magnet 32 at the horizontal closed position and the tilt open position of the water dish 5. Non-contact water pan position detecting means. In the present embodiment, the magnet 32 is disposed at the tip of the fixture 35 attached to the output shaft 10A of the reduction motor 10 that tilts the water tray 5 and the magnetic reaction element 33 is connected to the output shaft 10A side of the reduction motor 10. Is provided around the output shaft 10A.

Here, the water pan position detection switch 30 of the embodiment will be described in detail. The water pan position detection switch 30 according to the embodiment includes the magnet 32 and the magnetic reaction element 33 as described above. The magnet 32 is attached to the output shaft 10A of the reduction motor 10 (the reduction motor 10 side of the drive cam 17), and the distal end portion of the attachment 35 that extends in the radial direction of the output shaft 10A along the first arm 17A. It is arranged. In this embodiment, Hall elements 33A and 33B are used as the magnetic reaction element 33 that reacts to the magnetic lines of force of the magnet 32.

  In this case, as shown in FIGS. 6 and 7, the Hall elements 33A and 33B are arranged on the printed wiring on one surface (the lower surface in the drawing) of the substrate 37 having a notch that is curved so as to surround the output shaft 10A. It is provided at both ends. Then, a mounting base 36 having substantially the same shape as the board 37 is prepared, and the printed wiring side (hall element side) of the board 37 is brought into close contact with and fixed to the mounting base 36 as shown in FIG. The circumference is sealed with a sealing member 38 in a watertight manner. The mounting base 36 is on the speed reduction motor 10 side, the output shaft 10A is disposed in the cutout portion, and is attached to one surface of the speed reduction motor 10 so as to surround the output shaft 10A.

  In this state, one Hall element 33A is positioned above the output shaft 10A, and the other Hall element 33B is positioned below the opposite output shaft 10A. The hall element 33A rotates the drive cam 17 counterclockwise as indicated by an arrow in FIGS. 5 and 7 by the reverse rotation of the reduction motor 10, and when the water tray 5 reaches the horizontal closing position, It arrange | positions so that it may correspond to the arrange | positioned magnet 32. FIG. When the magnet 32 reaches a position corresponding to the Hall element 33A, the Hall element 33A detects the magnetic lines of force of the magnet 32 and generates an output (hereinafter referred to as ON. The magnetic lines of force of the magnet 32 are detected. When it is not, it is OFF.) By this, the horizontal closing position of the water tray 5 is detected without contact.

  The hall element 33B rotates the drive cam 17 clockwise as indicated by an arrow in FIGS. 13 and 14 (described later) by forward rotation of the speed reduction motor 10, and the magnet 32 when the water tray 5 reaches the tilt opening position. It is arranged to correspond to. When the magnet 32 reaches the position corresponding to the Hall element 33B in this way, the Hall element 33B detects the magnetic lines of force of the magnet 32 and generates an output (hereinafter referred to as ON. The magnetic lines of force of the magnet 32 are detected. When it is not, it is OFF.) By this, the tilt open position of the water tray 5 is detected without contact.

  Further, stoppers 34A and 34B are integrally formed on the mounting base 36. The stoppers 34 </ b> A and 34 </ b> B are regulating members for regulating the rotation of the fixture 35, and are formed by projecting two edges on the notch portion side of the surface of the mounting base 36 against which the substrate 37 abuts. ing. In this case, in the stopper 34A, the fixture 35 rotates to the backward side (the arrow side shown in FIG. 7), and the magnet 32 attached to the fixture 35 reaches a position corresponding to the Hall element 33A. The stopper 37 and the fixture 35 are disposed at a position where they come into contact with each other when the plate 5 passes through a position where it reaches the horizontal closing position and further rotates. Therefore, since the stopper 34A can restrict the rotation of the fixture 35 on the backward movement side, the inconvenience of the fixture 35 rotating further on the backward movement side can be avoided. Moreover, the stopper 34B rotates the fixture 35 to the tilt side (arrow side shown in FIG. 14), the magnet 32 of the fixture 35 reaches the position corresponding to the Hall element 33B, and the water tray 5 is in the tilt open position. The stopper 34B and the fixture 35 are disposed at a position where the stopper 34B comes into contact with the fixture 35 when it further rotates after passing through the position reached. Therefore, the stopper 34B can regulate the rotation of the fixture 35 on the tilt side, and the inconvenience of the fixture 35 rotating further on the tilt side can be avoided.

  Furthermore, both stoppers 34A and 34B are positioned when the fixture 35 is attached to the output shaft 10A. In other words, when attaching the fixture 35 to the output shaft 10A, it may be attached so as to extend between the stoppers 34A, 34B and toward the substrate 37 (that is, the right side in FIG. 7). Accordingly, it is possible to reliably eliminate the inconvenience of attaching to the opposite side (that is, the left side in FIG. 7) by mistake when attaching the fixture 35. Further, since the outer peripheral edge of the fixing portion between the mounting base 36 and the substrate 37 is sealed by the sealing member 38 over the entire circumference, the Hall element 33A provided on one surface of the substrate 37 (surface on the speed reduction motor side). 33B and the printed wiring are not submerged, and the occurrence of failure due to the submersion is also eliminated.

  Next, the cooling device R of the present embodiment will be described with reference to the refrigerant circuit diagram of FIG. In the cooling device R of the embodiment, the compressor 21, the auxiliary condenser 41, the condenser 42, the three-way pipe 43, the liquid receiver 44, the dryer 45, the expansion valve 46, the cooler 1, the accumulator 47, and the like are connected by piping. It is comprised by. That is, the discharge side pipe of the compressor 21 is connected to the inlet of the three-way pipe 43. One outlet of the three-way pipe 43 is connected to the condenser 42. The condenser 42 is a heat dissipating means for cooling the high-temperature and high-pressure refrigerant gas compressed by the compressor 21, and a condenser cooling fan 22 as a condenser cooling means is provided in the vicinity of the condenser 42. is set up. A pipe connected to the outlet of the condenser 42 is connected to an inlet of an expansion valve 46 as a pressure reducing device via a liquid receiver 44 and a dryer 45, and a pipe exiting the expansion valve 46 is an inlet of the evaporation pipe 2. To. The pipe connected to the outlet of the evaporation pipe 2 constitutes an annular cycle that returns to the suction side of the compressor 21 via the accumulator 47.

  On the other hand, a hot gas pipe 48 is connected to the other outlet of the three-way pipe 43, and a hot gas electromagnetic valve 23 is interposed in the middle of the hot gas pipe 48. The hot gas electromagnetic valve 23 is an electromagnetic valve for controlling the flow of the high-temperature and high-pressure refrigerant gas compressed by the compressor 21 into the evaporation pipe 2, and the compressor is in a state where the hot gas electromagnetic valve 23 is open. The high-temperature and high-pressure refrigerant gas (hot gas) discharged from 21 is supplied directly to the evaporation pipe 2 (without passing through the condenser 42, the liquid receiver 44, the dryer 45, and the expansion valve 46).

  In the figure, reference numeral 41 denotes an auxiliary condenser for cooling the high-temperature and high-pressure refrigerant gas compressed by the compressor 21, and the refrigerant gas cooled by the auxiliary condenser 41 is returned to the compressor 21 once. After that, the pipe 21 connected to the discharge side is discharged to the outside of the compressor 21.

  Next, in the control device 20 of FIG. 3, the following circuits are connected to the power source AC via the operation switch 65. That is, the compressor 21 of the cooling device R is connected in series with the relay R1, and the fan 22 that cools the condenser 42 of the cooling device R is connected in series with the relay R2.

  The pump motor 9M of the circulation pump 9 is connected in series with the relay R3, the hot gas solenoid valve 23 is connected in series with the relay R7, and the water supply solenoid valve 12 is connected in series with the relay R4. The reduction motor 10 is connected in series with the relay R5 and the switching relay R6. The switching relay R6 is closed to the contact a side to rotate the reduction motor 10 forward, and is switched to the contact b side to reverse the reduction motor 10.

  These relays R1 to R7 are controlled by a general-purpose microcomputer 25 as control means. The microcomputer 25 is connected to the water level switch WLSW and the hall terminals 33A and 33B constituting the water pan position detection switch 30 and contact points when a predetermined full ice amount in the ice storage S is detected. Is connected to the ice storage switch BSW. Further, an input of the microcomputer 25 includes an ET sensor 26 that detects the temperature of the cooler 1, a CT sensor 31 that detects the outlet temperature of the condenser 42 (the temperature of the condenser 42), and the water tank 6. A WT sensor 51 for detecting the water temperature and an AT sensor 52 for detecting the outside air temperature are connected, a forced water supply switch 53 for forcibly supplying water by the water supply electromagnetic valve 12, and a forced ice removal for forcibly deicing. A switch 55 and a feed switch 54 for switching the display of the display 29 to be described later and for fast-forwarding the time are respectively connected. The forced water supply switch 53, the forced ice removal switch 55, and the feed switch 54 are arranged in parallel on the substrate 37 in this order.

  A monitor 27 and a display 29 are connected to the output of the microcomputer 25. For example, when the control device 20 determines that an abnormality has occurred, the display 29 is a display unit for displaying the occurrence of the abnormality, and is configured by a 7-segment two-digit LED. The microcomputer 25 is connected with a memory 28 made of, for example, an EEPROM, and the memory 28 keeps the stored contents without losing the stored contents even when the ice making machine I is de-energized. Erase the stored contents.

  Next, the operation of the ice making machine I with the above configuration will be described. It is also assumed that after installing the ice making machine I, for a long period of non-use, or after the power supply AC was cut off due to a momentary power failure, the operation switch 65 was closed again and the ice making machine I was turned on (ON). . At this time, the position of the water pan 5 is not fixed, and is in the horizontal closed position (FIG. 4) or the tilt opening position (FIG. 12), or in the middle of the tilt state, and the tilt state is also in the middle of tilting. It is thought that it is in the middle of returning.

  However, the state can be distinguished into three types depending on the state of the Hall element 33A and the Hall element 33B of the water pan position detection switch 30. That is, when the hall element 33A of the water pan position detection switch 30 is ON and the hall element 33B is OFF, the water dish 5 is in the horizontal closed position, the hall element 33A is OFF, and the hall element 33B is ON. When the water pan 5 is in the inclined open position, the water pan 5 is in the middle of tilting or in the middle of returning when both the hall elements 33A and 33B are OFF.

  Therefore, when the operation switch 65 is closed and the power source AC is turned on (ON), the microcomputer 25 determines the state of the water pan position detection switch 30, the Hall element 33A is ON, and the Hall element 33B is OFF. When the water tray 5 is in the horizontal closing position, the relay R5 is closed, the switching relay R6 is closed to the contact a side, the speed reduction motor 10 is rotated forward, and the water tray 5 is tilted. Then, the state of the water pan position detection switch 30 is determined again, and if it is in the middle of tilting, that is, if the Hall element 33A and the Hall element 33B are OFF, the tilting operation is continued. When the water pan 5 reaches the predetermined tilt open position and the hall element 33B of the water pan position detection switch 30 is turned ON, the microcomputer 25 closes the switching relay R6 to the contact side and reverses the speed reduction motor 10 to reverse the water pan 5 Start the return.

  The microcomputer 25 next determines whether or not the water pan 5 has been closed (horizontal closed position) for 15 seconds (predetermined time). If not, the microcomputer 25 again determines the state of the water pan position detection switch 30 and restores it. If the Hall element 33A and the Hall element 33B are in the OFF state during the movement, the reverse operation is continued, and the relay R4 is closed and the water supply solenoid valve 12 is opened (ON) 15 seconds before. When the water supply solenoid valve 12 is opened, water is sprinkled from the sprinkler 13 to the surface of the water tray 5, and mainly supplied through the return hole to the water tank 6. Next, the water level of the water tank 6 is determined by the water level switch WLSW. It is determined whether or not the full water level is reached. If not, the above water supply is continued.

  Thereafter, when the water tray 5 is in the horizontal closing position (FIG. 4) and the hall element 33A of the water tray position detection switch 30 is turned on, the microcomputer 25 stops the backward movement of the water tray 5.

  On the other hand, when the power source AC is turned on (ON), the hall element 33A of the water pan position detection switch 30 is turned off and the hall element 33B is turned on and the water tray 5 is in the inclined open position. If both 33A and Hall element 33B are OFF and the water tray 5 is in the middle of tilting or returning, the microcomputer 25 closes the relay R5 and closes the switching relay R6 to the contact b side to reduce the motor 10 Is reversed and the water tray 5 is moved backward. Thereafter, the backward movement is continued until the hall element 33A of the water dish detection switch 30 is turned ON, and the water dish 5 is stopped in the same manner when the water dish 5 is in the horizontal closed position.

  Thus, when the microcomputer 25 is turned on (ON), the state of the water dish 5 is determined according to the output state of the hall element 33A and the hall element 33B of the water dish position detection switch 30, and the water dish 5 is horizontally closed. When the position is determined, the water dish 5 is once tilted and then moved backward to a predetermined horizontal closing position, and the water dish 5 is determined to be in the inclined open position, in the middle of tilting, or in the middle of backward movement. In this case, the water tray 5 is moved backward to the horizontal closing position. In any case, according to the ice making machine I of the present invention, after the power is turned on, the water tray 5 is always initialized to the horizontal closing position.

  Thereafter, when the water level switch WLSW detects the full water level in the water tank 6, the relay R4 is opened and the water supply electromagnetic valve 12 is stopped (OFF). Next, the microcomputer 25 closes the relays R3 and R7, operates the pump motor 9M of the circulation pump 9 (ON), and opens the hot gas solenoid valve 23 (ON).

  When the pump motor 9M of the circulation pump 9 is operated, water in the water tank 6 is fountained from the fountain hole to the ice making chamber 1A and circulated through a path returning from the return hole to the water tank 6. As a result, dust and water stains accumulated or adhering in the circulation channel are washed, and dust clogged in the fountain hole is also removed.

  Next, the microcomputer 25 determines whether or not the count of the timer included as the function is 30 seconds, and if not, the cleaning is continued. After such cleaning is executed for 30 seconds, the microcomputer 25 closes the relay R1, starts the compressor 21, and shifts to the following ice removal process.

  In this icing process, the microcomputer 25 opens the relay R2 and the relay R3, stops the condenser cooling fan 22 and the pump motor 9M of the circulation pump 9, closes the relay R5 and the relay R7, and contacts the switching relay R6. The speed reduction motor 10 is normally rotated by closing to the a side, and the water tray 5 is tilted.

  On the other hand, when the compressor 21 is started, the high-temperature and high-pressure refrigerant gas compressed by the compressor 21 is discharged from the compressor 21 and flows into the auxiliary condenser 41 to radiate heat. The refrigerant gas radiated by the auxiliary condenser 41 once returns to the compressor 21 and is discharged again to reach the three-way pipe 43. Here, since the hot gas solenoid valve 23 of the hot gas pipe 48 connected to the other outlet of the three-way pipe 43 is open as described above, the high-temperature and high-pressure refrigerant gas from the compressor 21 passes through the hot gas pipe 48. Then, it is supplied directly to the evaporation pipe 2 and the cooler 1 is heated.

  Then, when the water pan 5 is tilted to a predetermined tilt open position (full open) as shown in FIG. 12, the magnet 32 of the fixture 35 moves to a position corresponding to the hall element 33B of the water pan position detection switch 30 (FIG. 13 and FIG. 14), the Hall element 33B is turned ON. Thereby, the microcomputer 25 opens the relay R5, stops the reduction motor 10, and stops the tilting of the water tray 5. When the water tray 5 is in the inclined open position, the circulating water in the water tank 6 is drained to a drainage section (not shown) located immediately below the water tank 6. Then, it is determined whether or not the temperature of the cooler 1 taken in by the ET sensor 26 has become higher than the deicing completion temperature of, for example, + 9 ° C. If it is higher, the relay R5 is closed and the switching relay R6 is closed to the contact b. Then, the speed reduction motor 10 is reversely rotated, and the water tray 5 is moved back upward.

  When the water tray 5 returns to a predetermined horizontal closed position (fully closed) as shown in FIG. 4 by such backward movement, the magnet 32 provided on the fixture 35 moves to a position corresponding to the Hall element 33A on the substrate 37. Since the hall element 33A is turned on, the microcomputer 25 opens the relay R5 and the relay R7, closes the hot gas solenoid valve 23, stops the speed reduction motor 10, and stops the return movement of the water tray 5. Then, the microcomputer 25 closes the relay R1, and proceeds to the following ice making process while operating the compressor 21. The microcomputer 25 closes the relay R4 and opens the water supply electromagnetic valve 12 15 seconds before the water tray 5 is fully closed, and starts water supply to the water tank 6 as described above.

  In this ice making process, the microcomputer 25 operates the fan 22 for cooling the condenser while closing the relays R2 and R4 and supplying water, and closes the relay R3 and operates the pump motor 9M of the circulation pump 9. Water in the water tank 6 is circulated from the fountain hole to each ice making chamber 1A.

  Then, when the compressor 21 is started, heat is radiated by the auxiliary condenser 41 compressed by the compressor 21 as described above, and once returned to the compressor 21, it is discharged again and flows into the three-way valve 43. Since the hot gas solenoid valve 23 is closed as described above, all of the refrigerant gas flows into the condenser 42 without being supplied directly from the hot gas pipe 48 to the evaporation pipe 2.

  The high-temperature and high-pressure refrigerant gas that has flowed into the condenser 42 is air-cooled and condensed by the ventilation of the fan 22 in the process of passing through the condenser 42, and then exits the condenser 42 and passes through the receiver 44 and the dryer 45. It reaches the expansion valve 46 as a pressure reducing device. The refrigerant is depressurized by the expansion valve 46 and flows into the evaporation pipe 2 and is evaporated by absorbing heat from the cooler 1. Thereby, the water supplied to each ice making chamber 1A of the cooler 1 is cooled. Then, the refrigerant exiting the evaporation pipe 2 repeats a cycle of returning to the compressor 21 via the accumulator 47.

  On the other hand, the microcomputer 25 determines whether or not the water level switch WLSW is closed, and when a predetermined amount of water is supplied into the water tank 6 and the water level switch WLSW detects and closes the predetermined water level, the relay R4 is opened to supply water. The solenoid valve 12 is closed to stop water supply. The microcomputer 25 takes in the water temperature in the water tank 6 based on the output of the WT sensor 51 and determines whether or not the water temperature has reached, for example, + 3 ° C. or lower for 3 seconds. Then, the process waits until this condition is satisfied. Next, if the integrated value of the ice making timer that the microcomputer 25 has as its function does not reach the predetermined integrated value, the integration of the ice making timer is continued. By the ice making operation, ice is gradually generated in the ice making chamber 1A of the cooler 1.

  When the ice making timer reaches a predetermined integrated value, the microcomputer 25 opens the relay R2 and the relay R3, and stops the condenser cooling fan 22 and the pump motor 9M of the circulation pump 9. Next, the relay R5 and the relay R7 are closed, the switching relay R6 is closed to the contact a side, the speed reduction motor 10 is rotated forward, the tilting of the water dish 5 is started, and the hot gas solenoid valve 23 is opened to evaporate. The high-temperature and high-pressure refrigerant gas (hot gas) is circulated through the pipe 2, and the cooler 1 is heated to shift to the deicing process of ice frozen in the ice making chamber 1 </ b> A.

  This deicing process is performed in the same manner as described above, and the ice generated in the ice making chamber 1A falls on the tilting water tray 5, and further falls and stored in the ice storage S below. When the water pan 5 is tilted to the predetermined tilt open position (full open) as described above, the magnet 32 moves to the position corresponding to the hall element 33B and the hall element 33B is turned on, the microcomputer 25 turns on the relay R5. It opens and the deceleration motor 10 is stopped and the tilting of the water tray 5 is stopped. During this ice removal process, the microcomputer 25 determines whether or not the ice storage switch BSW is closed. When a predetermined amount of ice is stored in the ice storage S, the relay R1 and the relay R7 are opened, and the compression is performed. The operation of the machine 21 and the circulation pump 9 is stopped. Further, the relay R4 is opened, the water supply electromagnetic valve is closed, and the process proceeds to the ice storage stroke.

  The ice storage process is continued until the ice in the ice storage S is used (consumed), decreases, and the ice storage switch BSW is closed. When the ice storage switch BSW is closed, the microcomputer 25 returns to the ice making process again.

  As described above, by providing the non-contact type water pan position detection switch 30 for detecting the horizontal blocking position and the tilt opening position of the water tray 5 as compared with the case of using the conventional contact type water tray position detection switch. Thus, the opening and closing of the water tray 5 can be controlled more accurately. Here, a conventional contact-type water pan position detection switch will be described with reference to FIGS. The ice making machine shown in FIGS. 24 to 27 is an ice making machine provided with a water pan position detection switch ASW as a conventional contact-type water pan position detecting means. FIG. 24 shows that the water tray 5 of the ice making machine CI is horizontal. 25 is a partial plan view of FIG. 24, FIG. 26 is a side view of the ice making unit with the water tray of the ice making machine CI in the inclined open position, and FIG. FIG. 26 shows a partial plan view of FIG. 24 to 27, the same reference numerals as those in FIGS. 1 to 23 of the present invention are given the same or similar functions, and the description thereof is omitted.

  As shown in FIGS. 24 to 27, the conventional contact-type water pan position detection switch ASW is a contact type for detecting the horizontal closing position and the tilt opening position of the water tray 5 according to the open / closed state of the contact of the switching lever 100. This is a water pan position detection switch. The water pan position detection switch ASW is provided on the mounting plate 16 fixed to the support beam 15, and the switching lever 100 of the water pan position detection switch 30 is connected to the first and second arms 17 A and 17 A of the drive cam 17. It is arranged at a position where 17B abuts. Then, when the drive cam 17 rotates counterclockwise in FIGS. 24 and 26 due to the normal rotation of the reduction motor 10, the second arm 17B comes into contact with the switching lever 100 when the water dish 5 reaches the inclined open position. Thereby, the contact point of the water pan position detection switch ASW is closed and switched to the reverse side. That is, when the second arm 17B comes into contact with the front side (right side in FIG. 26) of the switching lever 100 of the water pan position detection switch ASW and is pushed rearward (left side in FIG. 26), the switching lever 100 is switched. The contact is closed and switched to the reverse side.

  Further, when the drive cam 17 rotates clockwise in FIGS. 24 and 26 by the reverse rotation of the reduction motor 10, the first arm 17A comes into contact with the switching lever 100 when the water tray 5 reaches the horizontal closing position, thereby The contact point of the water pan position detection switch ASW is opened and switched to the tilt side. That is, when the first arm 17A abuts from the rear side (left side in FIG. 24) of the switching lever 100 of the water pan position detection switch ASW and is pushed forward (right side in FIG. 24), the switching lever 100 is switched. Thus, the contact is opened and switched to the tilt side.

  In the conventional contact-type water pan position detection switch ASW described above, the switch may not be switched at a desired position due to an error when the switching lever 100 of the water tray position detection switch ASW is assembled. In addition, there is a problem that the first arm 17A or the second arm 17B does not operate even if it comes into contact. In particular, since the switching lever 100 of the water pan position detection switch ASW is installed on the mounting plate 16 separated from the output shaft of the reduction motor 10, it is difficult to position the switching lever 100, and an assembly error is likely to occur. Further, the switch ASW may be submerged and become defective. Further, since the switching is performed by the contact between the lever and the arm, the deterioration over time has become severe, and there has been a problem that the switch switching failure occurs due to these causes. When such a switch switching failure occurs, for example, although the water tray 5 moves backward and closes the ice making chamber 1A, it further rotates in the direction in which the reduction motor 10 moves backward (close direction). An excessive load is applied to the reduction motor 10 and the structural parts, and a failure occurs.

  On the other hand, in the ice making machine I of the present invention, a conventional contact-type water pan position detection switch is used by providing a non-contact-type water pan position detection switch 30 for detecting the horizontal blocking position and the tilt opening position of the water tray 5. As compared with the case, it is possible to control the opening and closing of the water tray 5 more accurately, and it is also possible to prevent malfunction due to water immersion. In particular, the water pan position detection switch 30 such as the ice making machine I of the present embodiment is moved to the magnet 32 that moves with the tilting movement of the water tray 5, and the magnetic lines of the magnet 32 at the horizontal closed position and the tilt open position of the water dish 5. By comprising the magnetic reaction elements 33 such as the Hall element 33A and the Hall element 33B that react with each other, it becomes possible to reliably achieve improvement in controllability and cost reduction. In addition, the mounting space and the number of parts can be reduced, and the manufacturing cost can be reduced.

  Further, the magnet 32 is attached to the fixture 35, the fixture 35 is attached to the output shaft 10 </ b> A of the reduction motor 10 that tilts the water dish 5, and the magnetic reaction element 33 is attached to the periphery of the output shaft 10 </ b> A of the reduction motor 10. Mounting on the substrate 37 facilitates wiring and improves assembly workability. Further, by attaching the substrate 37 to a predetermined position of the reduction motor 10, it is possible to easily avoid the occurrence of a malfunction due to an assembly error.

  In the ice making machine I of the present embodiment described in detail above, the output cam 10A of the reduction motor 10 is provided with a drive cam 17 having first and second arms 17A and 17B extending in opposite directions. The other end of the coil spring 18 connected to the end of the first arm 17A of the drive cam 17 is connected to the side surface of the other end of the water dish 5. In the case where the water position detection switch 30 is used, the second arm 17B can be eliminated, the material cost can be reduced, and the manufacturing cost can be further reduced.

  Further, as described above, in the ice making machine I according to the present embodiment, the attachment 35 having the magnet 32 of the water pan position detection switch 30 attached to the output shaft 10A of the reduction motor 10 is attached. As shown, a magnet may be attached to the first arm 17A. 22 and 23 show an embodiment in which the magnet 32 is attached to the first arm 17A, and FIG. 22 shows the first reduction motor 10 and the first motor 10 in the ice making unit IU in a state where the water tray 5 is in the horizontal water blocking position. FIG. 23 is a front view of the speed reduction motor 10 and the first arm 17A of the ice making unit IU in a state where the water tray 5 is in the inclined open position.

  In this case, since the attachment of the magnet 32 can be shared by the first arm 17A, the number of parts can be further reduced.

  By the way, in such an ice making machine I, troubles in the tilting operation of the water tray 5 occur due to a failure of the speed reduction motor 10, wiring failure such as wiring disconnection or poor contact, or noise entering the wiring. Thus, there arises a problem that the speed reduction motor 10 operates even though the microcomputer 25 has not issued a command to operate the water tray 5.

  When such an abnormality occurs, it is desirable for the microcomputer 25 to detect the abnormality early and determine and deal with it appropriately. The determination of each abnormality detection of the microcomputer 25 of the present invention will be described in detail with reference to the flowcharts of FIGS.

(1) Detection of water dish open abnormality First, although the microcomputer 25 is controlled to tilt the water dish 5 from the horizontally closed position, the water dish 5 is caused by a failure of the speed reduction motor 10 or any other cause. Detecting an abnormality in the case where the lens cannot be tilted and remains in the horizontally closed position (so-called opening abnormality) will be described with reference to FIG. When the microcomputer 25 starts tilting the water pan 5 from the horizontal blocking position and the water tray position detection switch 30 detects the horizontal blocking position of the water tray 5 even after a predetermined time has elapsed, an opening abnormality has occurred. Judge that.

  That is, when the water dish 5 is tilted from the horizontal closing position, the microcomputer 25 issues a forward rotation command for the water dish 5 in step S1 of FIG. 15, and proceeds to step S2 to determine whether or not the hall element 33A is turned off. To do. When the hall element 33A is turned off, it is determined that no such opening abnormality has occurred, and the process proceeds to step S3 and proceeds to the next control.

  On the other hand, if the hall element 33A is ON in step S2, the microcomputer 25 proceeds to step S4 and starts counting a timer that has the function. In step S5, the timer starts counting to determine whether or not a predetermined time t1 has elapsed (for example, several seconds). If not, the process returns to step S2 and the output determination of the Hall element 33A is executed again. . If the predetermined time t1 has elapsed in step S5 without the Hall element 33A being turned OFF and the timer count ends, the microcomputer 25 proceeds to step S6 and determines that an abnormality has occurred, and then Shifts to the control at the time of abnormality described.

(2) Control at the time of abnormality When it is determined that an abnormality has occurred as described above, the microcomputer 25 next proceeds to control at the time of abnormality. FIG. 20 is a flowchart showing the control when the microcomputer 25 determines that there is an abnormality. If it is determined that an abnormality has occurred as described above, the microcomputer 25 stops the operation of the ice making machine I in step S51 of FIG. That is, the microcomputer 25 opens the relays R1 to R5 and R7 in step S51 and stops the operations of the compressor 21, the reduction motor 10 and other devices of the ice making machine I. Next, the process proceeds to step S52, where it is determined whether or not the number of restarts has reached the predetermined number n. If not, the microcomputer 25 proceeds to step S53 and resets itself.

  Next, the microcomputer 25 restarts the ice making machine I in step S54, proceeds to step S55, counts the number of restarts as a function thereof (the count number is not reset in step S52), and then Transition to control. As a result, the ice making machine I is restarted from the above-described operation when the power is turned on.

  As described above, when the microcomputer 25 determines that an abnormality has occurred, it resets the ice making machine I in step S53 and restarts it. Driving can be resumed.

  On the other hand, when the restart occurs a plurality of times, the microcomputer 25 controls to stop the operation and not restart. That is, when the operation is stopped in step S51 and the number of restarts reaches a predetermined number n in step S52, the microcomputer 25 proceeds to step S56 and activates the indicator 29 and an alarm device (not shown). Let

  As described above, when the number of restarts reaches the predetermined number n, the microcomputer 25 stops the operation and then does not restart, and operates the indicator 29 and the alarm device. In the event of an abnormality that leads to a serious failure that cannot be resolved even after resetting, further operation can be stopped and repairs can be encouraged.

  When an abnormality occurs according to the present invention as described in detail above, the microcomputer 25 can detect and determine the occurrence of the abnormality at an early stage and deal with the abnormality appropriately.

  Further, as in the present invention, the water pan position detection switch 30 detects the magnet 32 that moves together with the tilting movement of the water pan 5 described above, and the magnetic lines of force of the magnet 32 at the horizontal closed position and the tilt open position of the water dish 5, respectively. By comprising the hall elements 33A and 33B, it becomes possible to realize more accurate water dish opening / closing control and determination of occurrence of abnormality.

(3) Another control at the time of abnormality In the above-described control at the time of abnormality, the microcomputer 25 resets and restarts the ice making machine I immediately after stopping the operation. After stopping the operation, it may be reset and restarted after a lapse of a predetermined time. An example of this case will be described with reference to FIG. When the microcomputer 25 determines that an abnormality has occurred as in the case of the abnormal time control, the operation of the ice making machine I is stopped in step S51. Next, the microcomputer 25 proceeds to step S52 and determines whether or not the number of restarts has reached the predetermined number n. If not, the microcomputer 25 proceeds to step S57 and functions as the function. Start counting timer with.

  Next, the microcomputer 25 starts counting the timer in step S58 and determines whether or not a predetermined time t4 has elapsed. If not, the microcomputer 25 continues counting. When the count of the timer is executed for a predetermined time t4, the microcomputer 25 proceeds to step S59 and resets itself. Next, the microcomputer 25 restarts the ice making machine I in step S60, proceeds to step S61, counts the number of restarts as its function, and then proceeds to the next control.

  On the other hand, the microcomputer 25 stops the operation in step S51, and when the number of restarts reaches the predetermined number n in step S52, the microcomputer 25 proceeds to step S56 similarly to the above-described control, and displays 29 and An alarm device (not shown) is activated.

  Even when the microcomputer 25 is controlled as described above, since it is restarted after reset in step S59 as described above, it is possible to eliminate the abnormality due to a temporary factor and automatically restart the operation. it can. Further, when the number of restarts reaches a predetermined number n, the operation is stopped and then the restart is not performed, and the display 29 and the alarm device are operated, resulting in a serious failure. If an abnormality has occurred, it is possible to stop further operation and prompt repair.

  Furthermore, according to this control, when the microcomputer 25 determines that an abnormality has occurred, the operation is stopped, and after a predetermined time t4 has elapsed, the microcomputer 25 is reset and restarted. Can be resolved and the operation can be automatically resumed.

  As described above, according to the ice making machine I of the present invention, after the microcomputer 25 starts to tilt the water dish 5 from the horizontal closing position, the Hall element 33A of the water dish detection position switch 30 remains in place even after the predetermined time t1 has elapsed. In the ON state, it is determined that an abnormality has occurred. Therefore, due to some cause such as a failure of the speed reduction motor 10, the opening abnormality in which the water pan 5 cannot be tilted and remains in the horizontal closed position is accurately detected. Can be detected and dealt with.

(4) Detection of water dish occlusion abnormality Next, although the microcomputer 25 controls the water dish 5 to move backward from the tilt opening position, the water dish 5 cannot be moved back and tilted. Detection of a so-called occlusion abnormality that remains in the position will be described with reference to FIG. When the microcomputer 25 starts tilting the water tray 5 from the horizontal blocking position and the water tray position detection switch 30 detects the tilt opening position of the water tray 5 even after a predetermined time has elapsed, a blocking abnormality has occurred. Judge that.

  That is, when the water dish 5 is moved backward from the inclined open position, the microcomputer 25 issues a reversal command for the water dish 5 in step S11 of FIG. 16, and proceeds to step S12 to determine whether or not the hall element 33B is turned off. Determine. When the Hall element 33B is turned off, it is determined that such a blockage abnormality has not occurred, and the process proceeds to Step S13 and proceeds to the next control.

  On the other hand, if the hall element 33B is ON in step S12, the microcomputer 25 proceeds to step S14 and starts counting a timer having the function. In step S15, the timer starts counting and it is determined whether or not a predetermined time t2 has elapsed. If not, the process returns to step S12 to determine the output of the Hall element 33B again. If the output of the Hall element 33B is not turned OFF and the predetermined time t2 has elapsed and the timer count ends in step S15, the microcomputer 25 proceeds to step S16 and determines that an abnormality has occurred. Then, the control shifts to the above-described control at the time of abnormality (2) or (3).

  As described above, according to the ice making machine I of the present invention, the hall element 33B of the water pan position detection switch 30 does not move even after the predetermined time t2 has elapsed after the microcomputer 25 starts moving the water pan 5 back from the inclined open position. When the ON state is detected, it is determined that an abnormality has occurred, so that the water pan 5 cannot move backward due to some cause such as a failure of the reduction motor 10 and remains in the inclined open position. It is possible to accurately detect and deal with abnormalities that are present.

(5) Detection of an abnormal stoppage in the middle of the water dish Next, detection of a so-called intermediate stop abnormality in which the water dish 5 remains stopped during the tilting or reverse movement will be described with reference to FIG. . When the water pan position detection switch 30 has not detected either the horizontal closing position or the tilt opening position of the water tray 5 for a predetermined time (t3), the macro computer 25 determines that an intermediate stop abnormality has occurred.

  That is, the microcomputer 25 executes the above-described controls after the ice making machine I is turned on (ON), and determines whether the water pan 5 is abnormally stopped as shown in FIG. In this case, the microcomputer 25 determines in step S21 whether or not either the hall element 33A or the hall element 33B of the water pan position detection switch 30 is ON. If either one of the hall elements 33A and 33B is ON, it is determined that no abnormal stoppage has occurred, and the process proceeds to step S22 to shift to the next control.

  On the other hand, if both the contact points of the Hall elements 33A and 33B are OFF in step S21, the microcomputer 25 proceeds to step S23 and starts counting a timer having the function. In step S24, the timer starts counting, and it is determined whether or not a predetermined time t3 (a time sufficiently longer than the time required for the tilting movement of the water tray 5) has elapsed. If not, the process returns to step S21. The determination of the output state of both Hall elements 33A and 33B is executed again. If neither of the Hall elements 33A and 33B is turned on until the timer count in step S24 is executed for a predetermined time t3, the microcomputer 25 proceeds to step S25 and an abnormality has occurred. It shifts to the control at the time of abnormality of (2) or (3) mentioned above.

  As described above, according to the ice making machine I of the present invention, the microcomputer 25 uses the hall element 33A and the hall element 33B of the water dish position detection switch 30 to determine both the horizontal closed position and the tilt opening position of the water dish 5 in advance. If the time (t3) has not been detected, that is, if neither of the Hall elements 33A and 33B is turned ON even after the predetermined time t3 has elapsed, it is determined that an abnormality has occurred. Due to the cause, it is possible to accurately detect and deal with an abnormality in which the water tray 5 remains stopped halfway between the horizontal closed position and the inclined open position.

(6) Detection of electrical abnormality 1
Next, the output of both hall elements 33A and 33B of the water pan position detection switch 30 is simultaneously turned on due to a wiring failure or noise entering the wiring, etc. (a pseudo input in which both hall elements are simultaneously turned on by noise) 18), detection of so-called electrical abnormality in which the microcomputer 25 simultaneously detects both the horizontally closed position and the inclined open position of the water dish 5 will be described with reference to FIG. . The microcomputer 25 determines that an electrical abnormality has occurred when the water pan position detection switch 30 detects both the horizontal blocking position and the tilt opening position of the water tray 5 at the same time.

  That is, the microcomputer 25 executes each of the above-described controls after the ice making machine I is turned on (ON), and also determines the electrical abnormality of the water tray 5 shown in FIG. In this case, the microcomputer 25 determines in step S31 whether or not both the hall element 33A and the hall element 33B of the water pan position detection switch 30 are ON at the same time. If it is determined that the error has not occurred, the process proceeds to step S32 to shift to the next control.

  On the other hand, if both the Hall element 33A and the Hall element 33B are ON at the same time in Step S31, the microcomputer 25 proceeds to Step S33 and determines that an abnormality has occurred, and the above-described (2) or The control shifts to (3) at the time of abnormality.

  As described above, according to the ice making machine I of the present invention, the microcomputer 25 uses the Hall element 33A and the Hall element 33B of the water dish position detection switch 30 to simultaneously set both the horizontal blocking position and the tilt opening position of the water dish 5. If detected, that is, if both the Hall element 33A and the Hall element 33B are ON at the same time, it is determined that an abnormality has occurred. Therefore, an abnormality in which erroneous detection information has occurred due to the influence of wiring failure or noise. Can be accurately detected and dealt with.

(7) Electrical abnormality detection 2
Next, the output of the water pan position detection switch 30 is output even though the microcomputer 25 has not issued a command for operating the speed reduction motor 10 due to a failure of the speed reduction motor 10 or wiring or noise entering the wiring. The detection of another electrical abnormality in which changes will be described with reference to FIG. The microcomputer 25 indicates that another electrical abnormality has occurred when the output of the water pan position detection switch 30 changes while the speed reduction motor 10 is stopped (a command to operate the speed reduction motor 10 is not issued). to decide.

  That is, the microcomputer 25 executes each of the above-described controls after the ice making machine I is turned on (ON), and also determines another electrical abnormality of the water tray 5 shown in FIG. In this case, the microcomputer 25 determines whether or not the reduction motor 10 is operated in step S41, that is, whether or not a command for operating the reduction motor 10 (forward or reverse) is issued. And when the reduction motor 10 is operated, it progresses to step S42 and transfers to the next control.

  On the other hand, if the reduction motor 10 is not operated in step S41, that is, if a command for operating the reduction motor 10 is not issued, the microcomputer 25 proceeds to step S43, and the water pan position switch 30 is set. The outputs of the Hall element 33A and the Hall element 33B are determined. That is, in step S43, the microcomputer 25 determines whether or not a change has occurred in the outputs of the Hall element 33A and the Hall element 33B. If not, it is determined that such an electrical abnormality has not occurred, It progresses to step S42 and transfers to the next control.

  On the other hand, in step S43, for example, both the Hall elements 33A and 33B, or any of the Hall elements (either the Hall element 33A or the Hall element 33B) output state from ON to OFF, or from OFF to ON. If there is a change in the output of the Hall element 33A and the Hall element 33B, such as a change, the microcomputer 25 proceeds to step S44 and determines that an abnormality has occurred, and the above (2) or (3) Shifts to control at the time of abnormality.

  As described above, according to the ice making machine I of the present invention, the microcomputer 25 causes an abnormality if the output of the hall element 33A and the hall element 33B of the water pan position detection switch 30 changes while the reduction motor 10 is stopped. Therefore, it is possible to accurately detect an abnormality in which the speed reduction motor 10 malfunctions due to a failure of the speed reduction motor 10, wiring, noise, or the like.

  In addition, although the water pan position detection switch 30 of the present embodiment is configured by the magnet 31 and the hall elements 32A and 32B that react to the magnetic lines of force of the magnet 31, they are not limited to this, and the reaction of the magnetic line of magnetic force of the magnets. Thus, the magnetic reaction element may be constituted by a reed switch whose contact is opened and closed, and in this case also, the opening and closing of the water dish can be accurately controlled.

It is a front view of the ice making machine of one Example of this invention. It is a side view of the ice making machine of one Example of this invention. It is an electric circuit diagram of the control apparatus of the ice making machine of one Example of this invention. It is a side view of the ice making part of the ice making machine in a state where the water tray is in the horizontal closing position. It is a front view of the reduction motor and arm of the ice making part of FIG. FIG. 6 is a front view of the reduction motor with the arm of FIG. 5 removed. It is an enlarged view of the reduction motor of FIG. It is a side view of the reduction motor of FIG. It is a top view of the reduction motor of FIG. It is sectional drawing of a board | substrate. It is a refrigerant circuit figure of the freezing apparatus of the ice making machine of this invention. It is a side view of the ice making part of the ice making machine in a state where the water tray is in the inclined open position. It is a front view of the reduction motor and arm of the ice making part of FIG. It is a front view of the state which removed the arm of FIG. It is a flowchart which shows the program of the microcomputer for judging the opening abnormality of a water tray. It is a flowchart which shows the program of the microcomputer for judging the obstruction | occlusion abnormality of a water tray. It is a flowchart which shows the program of the microcomputer for judging the middle stop abnormality of a water tray. It is a flowchart which shows the program of the microcomputer for judging the electrical abnormality of a water tray. It is a flowchart which shows the program of the microcomputer for judging that it is another electrical abnormality of a water tray. It is a flowchart which shows control when a microcomputer judges that it is abnormal. It is a flowchart which shows the other control when a microcomputer judges that it is abnormal. It is a front view of the speed reduction motor and arm of the ice making part of the ice making machine in the state where the water tray of another embodiment of the present invention is in the horizontally closed position. It is a front view of the reduction motor and arm of the ice making part of the ice making machine in the state where the water tray of another embodiment of the present invention is in the inclined open position. It is a side view of the ice making part of the state which has the water tray of the ice making machine provided with the conventional water tray position detection switch in a horizontal obstruction | occlusion position. It is a top view of the reduction motor and arm of the ice making part of FIG. It is a side view of the ice making part in the state in which the water tray of the ice maker provided with the conventional water tray position detection switch exists in the inclination open position. It is a top view of the reduction motor and arm of the ice making part of FIG.

Explanation of symbols

I ice making machine IU ice making part M machine room S ice storage 1 evaporator 1A ice making room 2 evaporation pipe 3 main body 4 heat insulation door 5 water tray 6 water tank 7 water supply pipe 9 circulation pump 10 speed reduction motor 11 drive unit 12 water supply solenoid valve 13 watering 17 Drive cam 17A 1st arm 17B 2nd arm 18 Coil spring 19 Rotating shaft 20 Control device 21 Compressor 22 Condenser fan 23 Hot gas solenoid valve 25 Microcomputer 27 Monitor 28 Memory 29 Display device 30 Dish position detection switch 32 Magnet 33 Magnetic reaction element 33A, 33B Hall element 34A, 34B Stopper 35 Mounting tool 36 Mounting base 37 Substrate 38 Seal member 41 Auxiliary condenser 42 Condenser 43 Three-way pipe 44 Liquid receiver 45 Dryer 46 Expansion valve 47 Accumulator 48 Hot Gas pipe

Claims (2)

A cooler in which a large number of ice making chambers opening downward are formed, and a tiltable water tray that closes each ice making chamber, and the water tray closes the ice making chamber at a predetermined horizontal closing position. In the ice making machine that performs the ice making process by fountaining the ice making chambers from the water dishes, and performing the ice removing process by heating the cooler at a predetermined inclined open position where the water dishes open the ice making chambers. ,
A motor for tilting the water pan; and a non-contact type water pan position detecting means for detecting a horizontal closing position and an inclination opening position of the water pan, the water pan position detecting means being connected to the water tray. A magnet that moves with tilting movement, and a magnetic reaction element that reacts to the magnetic field lines of the magnet at the horizontal closing position and the tilt opening position of the water dish, and the magnet is attached to the output shaft of the motor, and A magnetic reaction element is attached to the motor around the output shaft,
When the water pan position detecting means determines that the water pan is in the tilt open position even after a predetermined time has elapsed since the motor is driven to control the water pan to move backward from the tilt open position. The microcomputer for controlling the operation of the ice making machine is restarted, and has control means for stopping the operation of the ice making machine and giving an alarm when the number of restarts reaches a predetermined number. Ice machine.   2. The ice making machine according to claim 1, wherein an end of the water tray is connected to an arm attached to an output shaft of the motor, and the magnet is attached to the arm.