JPH0735449A - Ice-making machine - Google Patents

Abstract

PURPOSE:To clarify a troubled location in a so-called inverse cell type ice making machine in the case that a water pan-inclining time exceeds a normal value, and to eliminate an over-load to be applied to a driving device when it is troubled. CONSTITUTION:A micro-computer 25 of a control device 20 reversely operates a water pan for s sufficient longer hour than an exceeding time in the case that a water pan inclining time exceeds a normal value ranging from a starting of operation to a time until a water pan position sensing switch ASW is reversed and further the water pan inclining movement is repeated at a shorter period than a difference between a reversing operation time and the elapsing time.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called reverse cell type ice making machine.

[0002]

2. Description of the Related Art Conventionally, this type of ice making machine is disclosed in, for example, Japanese Unexamined Patent Publication No.
As shown in Japanese Patent No. 93266 (F25C1 / 04), a tiltable water tray is provided below a cooler that defines a large number of downwardly opening ice making compartments, and the water tray closes the ice making compartment. At the horizontal closed position, water is sprinkled from the surface of the water tray to each ice making chamber to perform the ice making process, and at the inclined open position where the water tray opens the ice making room, the high temperature and high pressure refrigerant from the compressor is flowed to the cooler and heated. It is configured to perform an ice clearance stroke. The tilting movement of the water tray is realized by a drive motor capable of rotating in the normal and reverse directions. However, in order to stop the drive motor when the water tray reaches the predetermined tilt open position and horizontal closed position, the water tray is usually operated by the water. A water tray position detection switch that is reversed by the movement of the tray is provided.

Further, according to the above-mentioned publication, when the tilting time of the water tray exceeds a normal value, it is judged that the rotating mechanism of the water tray has failed, and the energization of the drive motor is stopped, whereby the motor is stopped. Was to prevent damage.

[0004]

However, when the tilting time of the water tray exceeds the normal value as described in the above publication, it is not possible to determine where the failure is caused by simply stopping the drive motor. Since it is necessary to inspect each part individually, there is a problem that maintenance and repair work becomes complicated.

The present invention has been made in order to solve the problems of the prior art, and in a so-called reverse cell type ice making machine, the failure point is clarified when the tilting time of the water tray exceeds a normal value. It is intended to eliminate the overload applied to the drive device and the like at the time of the failure.

[0006]

That is, an ice making machine I according to a first aspect of the present invention comprises a cooler 1 in which a large number of downwardly opening ice making chambers 1A are defined, and a tilting movement for closing each ice making chamber 1A. The water tray 5 is provided with a possible water tray 5, and the circulation pump 9 sprays water to each ice making chamber 1A to perform an ice making step, and the cooler 1 is heated to perform an ice removing step. 5, a drive device 11 for tilting back and forth, a water tray position detecting means for detecting a predetermined tilt open position and a horizontal closed position of the water tray 5, and a drive device 11 and circulation based on the output of the water tray position detecting means. The pump 9 is provided with a control means (microcomputer) 25 for controlling other devices and a time limit means for accumulating the tilting time of the water tray 5, and the control means is based on the time limit means. When the return time exceeds the normal value and is sufficiently longer than the excess time It causes reverse operation of the water tray 5, in which repeated 傾復 dynamic water dish 5 in a shorter period than the difference between the inverse operation time and the overtime period.

In the ice making machine I of the second aspect of the present invention, the cooler 1 has a large number of downwardly opening ice making chambers 1A.
And a water tray 5 capable of tilting back and forth that closes each ice making chamber 1A. From this water tray 5, a circulating pump 9 sprays water into each ice making chamber 1A to perform an ice making process, and heats the cooler 1. A drive device 11 for tilting the water tray 5 for performing an ice-freezing stroke
And a water tray position detection switch ASW which is reversed by the movement of the water tray 5 and detects a predetermined tilt open position and horizontal closed position of the water tray 5, and is driven based on a reversing operation of the water tray position detection switch ASW. Control means (microcomputer) 25 for controlling the device 11 and the circulation pump 9 and other devices
And a time limit means for accumulating the tilting movement time of the water tray 5, and the tilting time of the water tray 5 is controlled by the control means based on the timing means from the start of operation to the water tray position detection switch ASW. When exceeding the normal value before reversing, the water tray 5 is reversely operated for a time sufficiently longer than the excess time, and the water tray 5 is tilted at a cycle shorter than the difference between the reverse operation time and the excess time. It is to repeat the return movement.

[0008]

According to the ice making machine I of the present invention, when the tilting time of the water tray 5 exceeds the normal value, the control means uses the time limit means to operate the water tray 5 for a time sufficiently longer than the excess time. Since the reverse operation is performed and thereafter the tilting movement of the water tray 5 is repeated at a cycle shorter than the difference between the reverse operation time and the excess time, an abnormality occurs in the water tray position detecting means (water tray position detecting switch) ASW. In the case of the water tray 5, the water tray 5 repeats the tilting movement in small increments. Therefore, the tilting movement of the water tray 5 allows the user to easily confirm the abnormality of the water tray position detecting means (water tray position detecting switch) ASW.

In particular, control means (microcomputer)
25 reverses the water tray 5 for a time sufficiently longer than the excess time and repeats the tilting movement of the water tray 5 at a cycle shorter than the difference between the reverse operation time and the excess time, so that the water tray 5 tilts. In the middle of the open position and the horizontal closed position, the water tray position detecting means (water tray position detecting switch) ASW performs small tilting movements within a range in which the position of the water tray 5 is not detected (reversed). Therefore, it is possible to reliably prevent the inconvenience that an overload is applied to the drive device 11 and other components during the tilting movement.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. 1 is an electric circuit diagram of a control device 20 of an ice making machine I of the present invention, and FIG. 2 is an ice making machine I in a state where a water tray 5 is in a horizontal closed position.
3 is a side view of the ice making chamber portion of FIG. 3, FIG. 3 is a side view of the ice making chamber portion of the ice making machine I with the water tray 5 in the inclined open position, and FIG. 4 is a refrigerant circuit diagram of the cooling device R of the ice making machine I.

2 and 3, the ice making machine I of the present invention is shown.
2 is a so-called reverse cell type ice making machine, which has a large number of downwardly opening ice making chambers 1A, and a cooler 1 in which an evaporation pipe 2 of a cooling device R is arranged on the outer surface of the upper wall, and FIG. At a predetermined horizontal closing position such as described above, each ice making chamber 1A is closed from below with a sufficient margin, and a water tray 5 having fountain holes and return holes (not shown) corresponding to each ice making chamber 1A, and the water tray 5 are provided. A water tank 6 fixed to the communication hole and communicating with the return hole,
The water in the water tank 6 is circulated through the water supply pipe 7 and a distribution pipe (not shown) from the fountain hole to circulate the water in the ice making chamber 1A, and the water tray 5 can be rotated forward and backward. Drive device 1 including a reduction motor 10 having a high gear ratio
1, a sprinkler 13 that sprinkles water on the surface of the water tray 5 when the water supply solenoid valve 12 of FIG. 4 is opened, and a float provided in the water tank 6 to operate the water tank 6 so that a predetermined full water level is reached. It is composed of a water level switch WLSW for detecting.

Then, the mounting plate 1 fixed to the support beam 15
An output shaft of the reduction motor 10 supported by the first and second arms 17 </ b> A and 1 </ b> A extending in mutually opposite directions.
7B is connected to the drive cam 17, and the coil spring 18 is attached to the end of the first arm 17A of the drive cam 17.
The other end of the water tray 5 is connected to the side portion of the water tray 5, and the rear portion of the water tray 5 is supported by the rotating shaft 19.

The ASW is a contact type water tray position detecting switch as a water tray position detecting means for detecting the horizontal closed position and the inclined open position of the water tray 5 by opening and closing the contacts. The water tray position detection switch ASW is in a positional relationship in which the first and second arms 17A and 17B of the drive cam 17 come into contact with each other, and when the drive cam 17 rotates counterclockwise in FIG. When the water tray 5 is at the tilt open position, the second arm 17B contacts the water tray position detection switch ASW as shown in FIG.
As a result, the contact of the water tray position detection switch ASW is closed and switched to the backward movement side.

When the drive cam 17 rotates clockwise in the figure due to the reverse rotation of the deceleration motor 10, the first arm 17A detects the position of the water tray when the water tray 5 is in the horizontal closed position as shown in FIG. The switch contacts the switch ASW, whereby the contact of the water dish position detection switch ASW is opened and switched and inverted to the tilting side.

The above are the components provided on the ice making room side of the ice making machine I. On the machine room side of the ice making machine I, the compressor 21, the auxiliary condenser 41 and the condenser of the cooling device R as shown in FIG. A container 42 and the like are provided. Next, the refrigerant circulation in the cooling device R will be described with reference to the refrigerant circuit diagram of FIG.
The high-temperature and high-pressure gas refrigerant discharged from 1 is the auxiliary condenser 4
After flowing into 1 and radiating heat, it returns to the compressor 21 once, and is discharged again to reach the three-way pipe 43. The refrigerant discharged from one outlet of the three-way pipe 43 is air-cooled and condensed in the condenser 42, reaches the expansion valve 46 via the liquid receiver 44 and the drier 45. The refrigerant throttled by the expansion valve 46 flows into the evaporation pipe 2 to evaporate, and absorbs heat from the cooler 1 to cool it. The refrigerant exiting the evaporation pipe 2 is returned to the compressor 21 via the accumulator 47. Further, a hot gas pipe 48 in which a hot gas solenoid valve 23 is interposed is connected from the other outlet of the three-way valve 43 to the outlet side of the expansion valve 46, and the hot gas solenoid valve 23 is opened and the compressor is opened. High-temperature high-pressure gas refrigerant (hot gas) discharged from 21
Is directly supplied to the evaporation pipe 2.

Next, in the controller 20 of FIG. 1, the following circuits are connected to the power source AC via the operation switch 35. That is, the compressor 21 that constitutes the cooling device R is connected in series with the relay R1, and the condenser cooling fan 22 that cools the condenser 42 of the cooling device R is the relay R2.
Are connected in series. The circulation pump 9 is a relay R
3 is connected in series, the hot gas solenoid valve 23 is connected in series with the relay R7, and the water supply solenoid valve 12 is connected.
Is connected in series with relay R4. Further, 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 deceleration motor 10 in the forward direction and switched to the contact b side to rotate the deceleration motor 10 in the reverse direction.

These relays R1 to R7 are controlled by a general-purpose microcomputer 25 as a control means. The water level switch WLSW and the water tray position detection switch ASW are connected to the input of the microcomputer 25, and the ice storage switch BSW that closes the contacts when a predetermined full ice amount in the ice storage (not shown) is detected is connected. . Further, the input of the microcomputer 25 is an ET sensor 26 for detecting the temperature of the cooler 1, a CT sensor 31 for detecting the outlet temperature of the condenser 42, and a WT sensor 51 for detecting the water temperature in the water tank 6. Also, an AT sensor 52 for detecting the outside air temperature is connected, and further, a forced water supply switch 53 for forcibly supplying water by the water supply solenoid valve 12, a forced ice removal switch 55 for forced ice removal, and a display described later. Switch the display of the container 29,
A feed switch 54 for fast-forwarding the time is connected to each. And these forced water switch 5
3, the forced ice removal switch 55 and the feed switch 54 are arranged in parallel in this order on the substrate.

A monitor 27 and a display 29 are connected to the output of the microcomputer 25, and the display 29 is composed of a 7-segment 2-digit LED.
Further, the microcomputer 25 has, for example, EEPRO.
A memory 30 composed of M is connected, and the memory 30 continues to retain the stored contents even if the power supply to the ice making machine I is cut off, and erases the stored contents by a clear operation described later.

Next, the operation of the ice making machine I will be described based on the flowcharts showing the program of the microcomputer 25 of FIGS. 5 and 6 and the operation process charts of the ice making machine I shown in FIGS. It is assumed that the operation switch 35 is closed again and the ice maker I is turned on (ON) after the ice maker I has been installed, or because the power supply AC has been cut off due to a long-term non-use or due to an instantaneous power failure. At this time, the position of the water tray 5 is not fixed, and it is either the horizontal closed position (FIG. 2) or the tilt open position (FIG. 3), or the tilted state in the middle (FIG. 10, FIG. 11), The tilted state may be in the middle of tilting or in the middle of returning.

However, such a state can be discriminated into two types by the open / closed state of the contact of the water tray position detecting switch ASW. That is, when the contact of the water tray position detection switch ASW is open and is on the tilt side, the water tray 5 is in the horizontal closed position or in the middle of tilting, and the contact of the water tray position detection switch ASW is closed and is on the return side. At one time, the water tray 5 is in the inclined open position or in the middle of returning.

Therefore, when the operation switch 35 is closed and the power supply AC is turned on (ON), the microcomputer 25 determines the state of the water tray position detection switch ASW in step S1, and the contact point is opened to the tilting side. If there is (Fig. 7
Situation. The water tray 5 is in the horizontal closed position or in the middle of tilting),
In step S2, the relay R5 is closed and the switching relay R
6 is closed to the contact a side, the deceleration motor 10 is normally rotated, and the water tray 5 is tilted. Then, in step S4, the state of the water tray position detection switch ASW is discriminated again, and if it is still on the tilt side, the process returns to step S2 to continue tilting. The water tray 5 comes to the predetermined tilt open position, and the water tray position detection switch AS
When the contact point of W is closed and reversed to the return side, the microcomputer 25 proceeds from step S4 to step S5 and this time closes the switching relay R6 to the contact point b side, and the deceleration motor 10
Reverse and start the return movement of the water tray 5.

Next, in step S6, the microcomputer 25 determines whether or not it is 15 seconds before the water tray 5 is completely closed (horizontal closed position), and if it is not, the process proceeds to step S9 and the water tray position detection switch is again executed. The state of the ASW is judged, and if it is still on the backward movement side, the procedure returns to step S5 to continue the backward movement. Then, 15 seconds before, the process proceeds from step S6 to step S7, the relay R4 is closed and the water supply solenoid valve 12 is opened (ON). When the water supply solenoid valve 12 is opened, water is sprayed from the sprinkler 13 onto the surface of the water tray 5, and mainly through the return hole to the water tank 6.
Will be supplied with water. Next, in step S8, the water level switch WL
It is determined by SW whether or not the water level in the water tank 6 has reached a predetermined full water level, and if not, the process proceeds to step S9.

After that, when the water tray 5 is in the horizontal closed position (FIG. 2) and the contact of the water tray position detection switch ASW is opened and inverted to the tilting side, the microcomputer 25 returns from step S9 to step S6. Therefore, the return movement of the water tray 5 is stopped.

On the other hand, when the contact of the water tray position detection switch ASW is closed and is on the backward movement side when the power supply AC is turned on (the situation of FIG. 7. The water tray 5 is in the inclined open position or the backward movement position). During the movement), the microcomputer 25 proceeds from step S1 to step S3 to close the relay R5, close the switching relay R6 to the contact b side, reverse the deceleration motor 10, and move the water tray 5 back. After that, the process proceeds to step S6, and thereafter, the return movement is continued until the water dish position detection switch ASW is reversed to the tilt side in step S9 as described above, and the water dish 5 is similarly stopped at the horizontal closed position.

Thus, the microcomputer 25 determines the state of the water tray 5 according to the open / closed state of the contact of the water tray position detection switch ASW when the power is turned on (ON),
If it is judged that the horizontal closing position or the tilting is in progress, the water tray 5
Is temporarily tilted and then returned to a predetermined horizontal closing position, and when it is judged that the water tray 5 is in the tilt open position or in the middle of returning, the water tray 5 is moved back to the horizontal closing position. 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 closed position.

After that, when the water tank 6 becomes full, the process proceeds from step S8 to step S10 in FIG.
4 is opened and the water supply solenoid valve 12 is stopped (OFF). Next, the microcomputer 25 proceeds to step S12 to close the relays R3 and R7, operate (ON) the circulation pump 9 and open the hot gas solenoid valve 23 (O).
N).

When the circulation pump 9 is operated, the water in the water tank 6 is sprayed from the fountain hole into the ice making chamber 1A, and is circulated in the route from the return hole to the water tank 6. As a result, the dust and water stains accumulated or attached in the circulating water passage are washed, and the dust clogging the fountain hole is also removed.

Next, the microcomputer 25 determines in step S13 whether or not the count of the timer having the function is 30 seconds. If not, the process returns to step S12 to continue the cleaning. After such cleaning is performed for 30 seconds, the microcomputer 25 executes step S
From 13 to step S14, the relay R1 is closed, the compressor 21 is started, and at the same time, the following ice removing process is performed.

In this ice removal process, the microcomputer 2
Numeral 5 opens the relays R2 and R3, stops the condenser cooling fan 22 and the circulation pump 9, closes the relays R5 and R7, closes the switching relay R6 to the contact a side, and causes the deceleration motor 10 to rotate normally. , Tilt the water tray 5. Further, since the hot gas solenoid valve 23 is opened, the high-temperature high-pressure gas refrigerant (hot gas) discharged from the compressor 21 is circulated through the evaporation pipe 2 to heat the cooler 1.

When the water tray 5 is tilted to a predetermined tilt open position (fully opened) as shown in FIG. 3, the second arm 17B of the drive cam 17 contacts the water tray position detection switch ASW and moves to the return side. Since it is inverted, the microcomputer 2
5 opens the relay R5 to stop the deceleration motor 10 and stop the tilting of the water tray 5. When the water tray 5 is at 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. The temperature of the cooler 1 taken in by the ET sensor 26 is, for example, +9.
It is judged whether the temperature is higher than the completion temperature of ice removal such as ℃, and if it is higher, the relay R5 is closed and the switching relay R
6 to the contact b to rotate the deceleration motor 10 in the reverse direction,
To move upwards.

When the water tray 5 is returned to a predetermined horizontal closed position (fully closed) as shown in FIG.
1st arm 17A of 7 is a water tray position detection switch ASW
The microcomputer 25 opens the relays R5 and R7, closes the hot gas solenoid valve 23, and stops the deceleration motor 10 to stop the return movement of the water tray 5. Then, the microcomputer 25 proceeds to step S15 to close the relay R1 and operate the compressor 21 to shift to the following ice making process. It should be noted that the microcomputer 25 closes the relay R4 15 seconds before the water tray 5 is completely closed to close the water supply solenoid valve 1.
2 is opened, and water supply to the water tank 6 is started as described above.

In the ice making process, the refrigerant discharged from the compressor 21 is condensed and liquefied by the auxiliary condenser 41 and the condenser 42 as described above, is squeezed by the expansion valve 46, and then is supplied to the evaporation pipe 2, where it is supplied. Evaporate to cool the cooler 1. Also,
The microcomputer 25 includes a relay R2 and a relay R.
4 is closed to operate the condenser cooling fan 22 while supplying water, and the relay R3 is closed to operate the circulation pump 9 to circulate the water in the water tank 6 from the fountain holes to the respective ice making chambers 1A. The ice making operation is started by.

After that, the microcomputer 25 judges whether the water level switch WLSW is closed, a predetermined amount of water is supplied to the water tank 6, and the water level switch WLSW detects a predetermined full water level and closes the relay R4. The water supply solenoid valve 12 is opened and the water supply is stopped. In addition, the microcomputer 25 starts integration of an ice making timer which the microcomputer 25 has as its function when the temperature has fallen to + 3 ° C. or lower for 3 seconds based on the water temperature in the water tank 6 taken in by the WT sensor 51. To do.

By the ice making operation, the ice making chamber 1 of the cooler 1
When the ice is gradually generated in A and the integrated value of the ice making timer is up, the microcomputer 25 proceeds to step S16 to open the relay R2 and the relay R3 to open the condenser cooling fan 22 and the circulation pump. Stop 9. Next, the relays R5 and R7 are closed, and the switching relay R6 is closed to the contact a side to reduce the speed of the deceleration motor 10.
And the tilting of the water tray 5 is started, and the hot gas solenoid valve 23 is opened to circulate the high-temperature high-pressure gas refrigerant (hot gas) in the evaporation pipe 2 to heat the cooler 1 to heat the ice making chamber 1A. The ice-freezing process of frozen ice is started.

This ice removing process is executed in the same manner as described above. Then, during this ice removal process, the microcomputer 25 determines whether or not the ice storage switch BSW is closed. If a predetermined amount of ice is stored in the ice storage (not shown), the microcomputer 25 proceeds to step S17 and relays R1 and relays. R7 is opened, the operation of the compressor 21 is stopped, and the ice storage process is started. After that, the ice in the ice storage decreases and the ice storage switch BSW
Is maintained until it is closed, and when the ice storage switch BSW is closed, the ice making process is executed again.

Next, referring to FIGS. 10 and 11, and FIG.
Based on the flowchart of FIG.
A malfunction detection operation of the water tray position detection switch ASW by the above will be described. In each of the operation steps, the tilting time of the water tray 5 by the deceleration motor 10 (the time required to reach from the horizontal closed position to the tilt open position) and the return time (the time required to reach from the tilt open position to the horizontal close position). The time is, for example, 50 seconds (normal value) when the power supply AC is 50 HZ.
Therefore, the microcomputer 25 determines in step S20 of FIG. 12 whether or not the water tray 5 has started the tilting or returning motion, and if it has started, in step S21 the time limit that the microcomputer 25 has as its function is limited. A failure detection timer as a means is counted. next,
In step S22, it is determined whether or not the water tray position detection switch ASW is tilted or reversed to the return side. If not, the count of the defect detection timer is 6 in step S23.
It is determined whether or not 0 seconds have been reached, and if not, step S
Return to 21 and repeat.

If the water tray position detecting switch ASW is reversed before 60 seconds have elapsed from the start of the operation of the water tray 5, the microcomputer 25 detects the water tray position detecting switch ASW.
It is determined that no malfunction has occurred in step S22.
From step S24, the defect detection timer is cleared.

However, when 60 seconds elapse without the water tray position detecting switch ASW being reversed from the start of the operation of the water tray 5, the water tray position detecting switch is obviously 10 seconds beyond the normal value of 50 seconds. ASW is malfunctioning,
The first arm 17A or the second arm 17B of the drive cam 17 moves for 10 seconds (excess time) past the water tray position detection switch ASW. In that case,
The water tray position detection switch ASW is a horizontal closing position of the water tray 5,
Alternatively, the tilt open position cannot be detected.

Particularly, when the horizontal closed position cannot be detected, the deceleration motor 10 continues to rotate in the reverse direction even after the first arm 17A of the drive cam 17 has passed the water tray position detection switch ASW. The first arm 17A comes into contact with the edge of the notch 16A of the mounting plate 16 (when the time exceeds about a second). Further, when the tilt open position cannot be detected, the deceleration motor 10 continues to rotate in the normal direction even after the second arm 17B of the drive cam 17 has passed the water tray position detection switch ASW. It is stretched so that it wraps around on the other side. Therefore, if these are left unattended, an overload (torque) is applied to the entire drive device 11 including the reduction motor 10, the drive cam 17, or the like, or the coil spring 18 is forcibly extended, which damages or deteriorates them. Will cause it.

Therefore, if the water tray position detection switch ASW does not reverse even after 60 seconds have elapsed from the start of operation of the water tray 5, the microcomputer 25 proceeds from step S23 to step S25 and circulates the pump 9 and the compressor 21. Forcibly stop other devices such as. Next, in step S26, a predetermined warning display (code) is displayed on the display 29, and the water tray position detection switch ASW is stored in the memory 30.
The abnormal data of is stored. Next, in step S27, the water tray 5 is reversely operated for 20 seconds, which is a time sufficiently longer than the excess time (10 seconds). That is, in the middle of the backward movement (when the horizontal closed position cannot be detected), as shown in FIG.
11 is tilted, and when tilting is in progress (when the tilt open position cannot be detected), it is moved back to the position shown in FIG.

As a result, the first arm 17A or the second arm 17B passes through the water tray position detecting switch ASW, and the water tray 5 is positioned between the horizontal closed position and the tilt open position. After that, the microcomputer 25 proceeds to step S28 and reverses the deceleration motor 10 for 5 seconds (20 seconds when the reverse operation time is returned for 20 seconds) which is a time sufficiently shorter than the difference between the reverse operation time (20 seconds) and the excess time (10 seconds). The opposite of the direction of rotation)
Then, the tilting movement (cycle 5 seconds) is repeated for 5 seconds in the normal rotation (rotation direction returned by 20 seconds).

By such control, the first arm 17A or the second arm 17B (water tray 5) passes through the water tray position detection switch ASW and returns to an intermediate position between the horizontal closed position and the tilt open position, and then the water is again fed. The tilting movement is repeated in small increments within a range (40 seconds to 45 seconds) where the dish position detection switch ASW does not come into contact. Therefore, the water tray 5 concerned
The tilting movement of the switch allows the user to easily confirm the malfunction of the water tray position detection switch ASW and repair it.

In particular, since it is surely prevented that the first arm 17A abuts the notch 16A of the mounting plate 16 and the coil spring 18 is unreasonably extended, the deceleration motor 10 can be operated during the tilting movement. The overload applied to the entire drive device 11 including the drive cam 17 or the coil spring 18 can be reliably eliminated, and the occurrence of damage to them can be prevented in advance.

Although the case where the contact type water tray position detection switch ASW is used has been described above, the first arm 17A or the second arm 17B shields the light so that the contact is tilted or returned. For example, an optical non-contact type water tray position detection switch ASW which is turned upside down may be used.

Here, the microcomputer 25 causes the display 29 to display the water tray position detection switch ASW as described above.
The memory 3 is displayed even if the power supply to the ice making machine I is cut off by the user after that.
Since 0 holds the abnormal data, if the service person turns on the power again when repairing, the microcomputer 25 continues to display an alarm on the display 29. Therefore, it is possible to reliably notify the service person of the occurrence of the abnormality. Further, the microcomputer 25 clears the abnormality data in the memory 30 when the serviceman repairs the abnormality of the water tray position detection switch ASW and presses both the forced water supply switch 53 and the feed switch 54 at the same time. , The forced stop and the alarm display are stopped. Therefore, it is possible to prevent confusion with an abnormality that occurs thereafter.

At this time, since the clearing is performed when both the forced water supply switch 53 and the feed switch 54 are pressed at the same time, it is not necessary to provide a special clearing switch, so that the number of parts can be reduced and the board can be reduced. Wiring can be simplified. In particular, since the clear operation is performed only when both the forced water supply switch 53 and the feed switch 54, which are separated from each other by the forced ice removal switch 55, are pressed at the same time, the alarm display disappears due to an erroneous operation. The inconvenience of becoming less likely to occur.

[0047]

As described above in detail, according to the present invention, when the tilting time of the water tray exceeds the normal value, the control means is based on the time limit means and the water tray is sufficiently longer than the excess time. Is reversely operated, and thereafter, the tilting movement of the water tray is repeated at a cycle shorter than the difference between the reverse operation time and the excess time, so that an abnormality occurs in the water tray position detecting means (water tray position detecting switch). In this case, the water tray repeatedly tilts back and forth. Therefore,
Due to the tilting movement of the water tray, the user can easily confirm the abnormality of the water tray position detecting means (water tray position detecting switch), and quick and accurate repair can be performed.

In particular, the control means reverses the water tray for a time sufficiently longer than the excess time, and repeats the tilting movement of the water tray at a cycle shorter than the difference between the reverse operation time and the excess time. The tray is in the middle of the inclined open position and the horizontal closed position, and the water tray position detecting means (water tray position detecting switch)
Will make small tilt movements within a range that does not detect (reverse) the position of the water tray. Therefore, it is possible to reliably prevent the inconvenience that an overload is applied to the drive device and other components during the tilting movement.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a control device for an ice making machine according to the present invention.

FIG. 2 is a side view of an ice making chamber portion of the ice making machine with the water tray in a horizontal closed position.

FIG. 3 is a side view of an ice making chamber portion of the ice making machine in a state where the water tray is in the inclined open position.

FIG. 4 is a refrigerant circuit diagram of the cooling device of the ice making machine of the present invention.

FIG. 5 is a flowchart showing a program of a microcomputer.

FIG. 6 is a flow chart showing a program of the same microcomputer.

FIG. 7 is an operation process diagram of the ice maker.

FIG. 8 is likewise an operation process chart of the ice maker.

FIG. 9 is also an operation process chart of the ice making machine.

FIG. 10 is a side view of the ice making chamber portion of the ice making machine for explaining the operation of the water tray position detection switch when the operation is defective.

FIG. 11 is a side view of the ice making chamber portion of the ice making machine for explaining the operation of the water tray position detection switch at the time of malfunction.

FIG. 12 is a flowchart showing a program of a microcomputer regarding detection of a malfunction of a water tray position detection switch.

[Explanation of symbols]

 ASW Water tray position detection switch I Ice maker R Cooling device 1 Cooler 1A Ice maker 2 Evaporating pipe 5 Water tray 9 Circulating pump 10 Decelerating motor 17 Drive cam 17 17A First arm 17B Second arm 20 Controller 21 Compressor 25 microcomputer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hideyuki Katayanagi 2-18-18 Keihan Hondori, Moriguchi City, Osaka Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. A cooler in which a large number of downwardly opening ice making chambers are defined and formed, and a tiltable water tray that closes each ice making chamber, and a fountain is spun from the water tray to each ice making chamber by a circulation pump. In the ice making machine that performs the ice making process and heats the cooler to perform the ice removing process, a drive device for tilting and returning the water tray and a predetermined tilt open position and horizontal closed position of the water tray are detected. A water tray position detecting means, a control means for controlling the drive unit, the circulation pump and other devices based on the output of the water tray position detecting means, and a time limit means for accumulating the tilting time of the water tray. The control means, based on the time limit means, when the tilting time of the water tray exceeds a normal value, reversely operates the water tray for a time sufficiently longer than the excess time, and The water has a cycle shorter than the difference between the reverse operation time and the excess time. An ice machine that repeats the tilting movement of the plate. 2. A cooler in which a large number of downwardly opening ice making chambers are defined and formed, and a tiltable water tray that closes each ice making chamber, and a fountain is circulated from the water tray to each ice making chamber by a circulation pump. In the ice making machine that performs the ice making process and heats the cooler to perform the ice removing process, the drive device that tilts and moves the water tray, and the water tray is reversed by the movement of the water tray, A water tray position detection switch for detecting the tilt open position and the horizontal closed position, a control means for controlling the drive unit, the circulation pump and other devices based on the reversing operation of the water tray position detection switch, and a tilt of the water tray. And a time means for accumulating the return time, wherein the control means is based on the time means.
When the tilting time of the water tray exceeds a normal value from the start of operation until the water tray position detection switch is reversed, the water tray is reversely operated for a time sufficiently longer than the excess time, and An ice making machine characterized in that tilting movement of the water tray is repeated at a cycle shorter than a difference between a reverse operation time and the excess time.