JPH06257912A - Ice maker - Google Patents

Abstract

PURPOSE:To clarify a point of a trouble when a skew double-acting time of a water tray exceeds a normal value in a so-called reverse cell type ice maker. CONSTITUTION:A microcomputer 25 of a controller 20 works to repeat a skew double-acting of a water tray within such a range that a water tray position detection switch will not invert again when the double-acting time of the water tray exceeds a normal value until the water tray position detection switch ASW reverses from the start of the operation.

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 horizontally closed position, water is sprayed from the fountain holes formed on 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 chamber, the high temperature high pressure refrigerant from the compressor is supplied to the cooler. It is configured to perform a deicing process by sinking and heating. 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. To prevent damage.

[0004]

However, when the tilting time of the water tray exceeds the normal value as described in the above publication, the drive motor is simply stopped to temporarily move the water tray position detecting switch. Operation cannot be continued in the event of a failure. Further, it is not possible to determine where the breakdown is occurring just by stopping, and it is necessary to inspect each part individually, which causes a problem of complicated maintenance and repair work.

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. The purpose is to enable normal operation to be continued in the case of temporary failure.

[0006]

[Means for Solving the Problems] That is, an ice making machine according to a first aspect of the present invention is a cooler having a plurality of downwardly opening ice making chambers defined therein, and a tiltable water tray for closing each ice making chamber. With a water fountain hole formed on the surface of the water tray, a circulation pump is used to spray water into each ice making chamber to perform the ice making process, and the cooler is heated to perform the ice removing process. A driving device that moves, a water tray position detection switch that is reversed by the movement of the water tray and detects a predetermined tilt open position and horizontal closed position of the water tray, and driven based on the reversing operation of the water tray position detection switch. The control means for controlling the device and the circulation pump and other devices and the time means for accumulating the tilting time of the water tray are provided, and the control means is based on the time means, and the tilting time of the water tray is Set the normal value from the start of operation until the water tray position detection switch reverses. If it was example, in which repeated 傾復 dynamic water dish within never inverted water pan position detecting switch again.

An ice making machine according to a second aspect of the present invention is provided with a cooler in which a large number of downwardly opening ice making chambers are defined, and a water tray capable of tilting back and forth for closing each ice making chamber. A fountain is formed from the fountain hole on the surface of the plate to irrigate the ice making chambers by the circulation pump to perform the ice making process, and the cooling device is heated to perform the ice removing process, and a drive device for tilting the water tray. A non-contact type water tray position detection switch which is reversed by the movement of the water tray and detects a predetermined inclined open position and horizontal closed position of the water tray, and a drive device based on the reversing operation of the water tray position detection switch. The control means controls the circulation pump and other devices, and the control means is based on the timed means, and the tilting time of the water tray is a normal value from the start of operation until the water tray position detection switch is reversed. If it exceeds, return the water tray to the state before the operation, It is intended to degrees tilt or backward.

Further, in the above-mentioned ice making machine according to a third aspect of the present invention, the control means executes a predetermined alarm operation when the tilting movement time exceeds a normal value, and tilts or returns the water tray again. It is characterized in that the alarm operation is stopped when the normal state is restored.

[0009]

According to the ice making machine of the first aspect of the present invention, when the tilting time of the water tray exceeds the normal value from the start of operation to the time when the water tray position detection switch is reversed, the control means reactivates the water. Since the water tray repeats the tilting movement within the range where the tray position detection switch does not reverse, if the water tray position detection switch malfunctions, the water tray will repeat the tilting movement in small increments. . Therefore, the tilting movement of the water tray enables the user to easily confirm the malfunction of the water tray position detection switch.

According to the ice making machine of the invention of claim 2,
When the tilting time of the water tray exceeds the normal value from the start of operation until the non-contact type water tray position detection switch is reversed,
Since the water tray is returned to the state before the operation is started and tilted or moved back again, for example, in the case of an optical water tray position detection switch, the water tray position detection switch may temporarily malfunction due to dirt or the like. When it comes to normal operation by the tilting movement performed again, the ice making machine will be able to return to normal operation and continue.

Further, according to the ice making machine of the third aspect of the present invention, in the above, the control means executes a predetermined alarm operation when the tilting movement time exceeds the normal value, so that the user can detect the position of the water tray. The malfunction of the switch can be recognized quickly, and when the water tray is tilted or moved back again to return to the normal state, the alarm operation is stopped, so in the case of a temporary malfunction, After that, the operation can be continued without any trouble.

[0012]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is an electric circuit diagram of a control device 20 of the ice making machine I of the present invention, and FIG. 2 is a partially cutaway side view of the ice making machine I. Ice machine I
Is a so-called reverse cell type ice making machine, which has a large number of downwardly opening ice making chambers 1A, a cooler 1 in which an evaporation pipe 2 of a cooling device is arranged on an outer surface of an upper wall, and a predetermined horizontal At the closing position, each ice making chamber 1A is closed from below with a sufficient margin, and a water tray 5 having a fountain hole 3 and a return hole 4 corresponding to each ice making chamber 1A on the surface and a water tray 5 fixed to the water tray 5 are provided. A water tank 6 communicating with the hole 4, a circulation pump 9 for ejecting the water in the water tank 6 from the fountain hole 3 through the water supply pipe 7 and the distribution pipe 8, and circulating the water to each ice making chamber 1A, and the water tray 5. A drive unit 11 including a deceleration motor 10 having a high gear ratio capable of tilting and reciprocating rotations, a sprinkler 13 that sprinkles water on the surface of the water tray 5 when the water supply solenoid valve 12 is opened, and the bottom of the water tank 6. In the float tank 14A communicating with the
The water level switch WLSW is activated by B, and the water tank 6
The water level detection device 14 and the like for detecting the predetermined full water level.

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 for detecting the horizontal closed position and the tilted 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 the drive cam 17 rotates counterclockwise in FIG. Then, when the water tray 5 is in the tilt open position, the second arm 17B contacts the water tray position detection switch ASW, whereby the contact of the water tray position detection switch ASW is closed and switched to the reverse side. To be done.

When the drive cam 17 rotates clockwise in FIG. 2 due to the reverse rotation of the deceleration motor 10, the first arm 17A becomes the water tray position detection switch ASW when the water tray 5 reaches the horizontal closed position. The contact of the water tray position detection switch ASW is opened by this contact, and is switched and inverted to the tilting side. Next, in the control device 20 of FIG. 1, the following circuits are connected to the power supply AC via the operation switch 35. That is, the compressor 21 that constitutes the cooling device is connected in series with the relay R1, and the condenser cooling fan 22 that cools the condenser (not shown) of the cooling device is the relay R2.
Are connected in series. The circulation pump 9 is a relay R
3, a hot gas solenoid valve 23 for controlling the supply of hot gas (high-temperature high-pressure gas refrigerant) to the evaporation pipe 2 of the cooler 1 is connected in series with the relay R7, and the water supply solenoid The valve 12 is connected in series with the relay R4. The deceleration motor 10 is connected in series with a relay R5 and a switching relay R6. This switching relay R6 has a contact a
The speed reduction motor 10 is normally rotated by closing the switch to the contact side and is switched to the contact b side to rotate the speed reduction 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 contacts are closed when a predetermined amount of full ice in an ice storage (not shown) located in the lower part of FIG. 2 is detected. The ice storage switch BSW is connected. A sensor 26 for detecting the temperature of the cooler 1 and a sensor 31 for detecting the temperature of the condenser are connected to the input of the microcomputer 25, and an alarm lamp 27 is connected to the output of the microcomputer 25. .

Next, the operation of the ice making machine I of the present invention will be described based on the flowcharts showing the program of the microcomputer 25 of FIGS. 3 and 4 and the operation process charts of the ice making machine I shown in FIGS. . After installing the ice maker I, or because it has not been used for a long time, or due to an instantaneous power failure, the power supply AC
After the power is cut off, the operation switch 35 is closed again and the ice making machine I
It is assumed that the power is turned on (ON). At this time water tray 5
The position of is not determined, and is the horizontal closed position, or the inclined open position, or the inclined state in the middle,
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 depending on the open / close 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, in the microcomputer 25, 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. If there is (Fig. 5
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). If not, the process proceeds to step S9 and the water tray position detection switch is restarted. 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 is mainly supplied to the water tank 6 through the return hole 4. Next, in step S8, the water level switch W
The LSW determines whether or not the water level in the water tank 6 has reached a predetermined full water level. If not, the process proceeds to step S9.

Thereafter, the water tray 5 is moved to the horizontal closing position (see FIG. 2).
When 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, and the return movement of the water tray 5 is stopped. . On the other hand, when the power tray AC is turned on (ON), the contact of the water tray position detection switch ASW is closed and is on the backward movement side (state of FIG. 5).
When the water tray 5 is in the inclined open position or in the backward 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, and reverse the deceleration motor 10 to rotate the water. Move the dish 5 back. After that, the process proceeds to step S6, and thereafter step S9 as described above.
Then, the backward movement is continued until the water tray position detection switch ASW is reversed to the tilting side, and the water tray 5 is similarly stopped at the horizontal closed position.

In this way, the microcomputer 25 determines the state of the water tray 5 according to the open / close state of the contact of the water tray position detection switch ASW when the power is turned on (ON), and the water tray 5
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 S7 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 3 into the ice making chamber 1A, and is circulated in the route from the return hole 4 back to the water tank 6. As a result, dust and water stains accumulated or attached in the circulating water passage are washed, and the dust clogging the fountain hole 3 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, and if not, the process returns to step S12 to continue the cleaning. In this way, the ice maker I executes the first washing step after turning on the power source to wash the inside of the circulating water channel.
Is surely set to the horizontal closed position, so that the inconvenience that water is sprayed from the fountain hole 3 in a state where the water tray 5 is inclined can be reliably prevented. Therefore, the lower ice storage was flooded and created,
Alternatively, it is possible to prevent the inconvenience that the ice generated thereafter is damaged.

After the cleaning is performed for 30 seconds, the microcomputer 25 executes steps S13 to S14.
Then, the relay R1 is closed, the compressor 21 is started, and at the same time, the ice removal process below is performed. That is, the ice maker I does not activate the compressor 21 during the first washing process after the power is turned on. Here, when the power is immediately turned on after the momentary power failure and the compressor 21 is operated at the same time, the pressure difference between the high pressure side and the low pressure side in the refrigerant circuit of the cooling device is large, and a large load is applied to the startup of the compressor 21. . Therefore, in the state where the pressure difference is large, there is a risk that startup failure such as inability to start the compressor 21 may occur, but in the present invention, the compressor 21 is not started during the first cleaning step after power-on. Therefore, the high / low pressure difference in the refrigerant circuit is alleviated during that time, and therefore the above-described start-up failure is prevented.

In particular, since the forced stop period of the compressor 21 is ensured by the operating time of the water tray 5 and the timer for setting the period (30 seconds) for cleaning, a special motor timer or a micro as in the prior art is used. The program of the computer 25 is unnecessary, and the configuration of the control device 20 of the ice making machine I can be simplified. In addition, during the 30 seconds in which the cleaning is performed before the compressor 21 is started, the microcomputer 25 opens the hot gas solenoid valve 23, so that the pressure equilibrium in the refrigerant circuit is performed more quickly. The start-up failure of the compressor 21 can be prevented more reliably.

Then, in the ice removal process, the microcomputer 25 opens the relays R2 and R3, stops the condenser cooling fan 22 and the circulation pump 9, and relays R5.
The relay R7 is closed, the switching relay R6 is closed to the contact a side, the deceleration motor 10 is normally rotated, and the water tray 5 is tilted. Further, since the hot gas solenoid valve 23 is opened, the hot gas discharged from the compressor 21 is circulated through the evaporation pipe 2 to heat the cooler 1.

When the water tray 5 tilts to a predetermined tilt open position (fully opened) as shown by the broken line in FIG. 2, the drive cam 1
2nd arm 17B of 7 is a water tray position detection switch ASW
Then, the microcomputer 25 opens the relay R5 and stops the deceleration motor 10 to 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. Then, the temperature of the cooler 1 taken in by the sensor 26 is, for example, +
It is determined whether the temperature is higher than the ice removal completion temperature such as 9 ° C., and if it is higher, the relay R5 is closed, the switching relay R6 is closed to the contact b to reverse the deceleration motor 10, and the water tray 5 is moved upward. I will move it back.

When the water tray 5 is returned to a predetermined horizontal closed position (fully closed) as shown by the solid line in FIG. 2 by such a returning movement, the first arm 17A of the drive cam 17 contacts the 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 because the tilting side is reversed. Then, the microcomputer 25 proceeds to step S15 and relay R
1 is closed, and the compressor 21 is operated to shift to the following ice making process. Note that the microcomputer 25 closes the relay R4 and opens the water supply solenoid valve 12 15 seconds before the water tray 5 is completely closed, and starts water supply to the water tank 6 as described above.

In the ice making process, the hot gas refrigerant discharged from the compressor 21 is condensed and liquefied by the condenser and decompressed by a decompression device such as a capillary tube (not shown).
It is supplied to the evaporation pipe 2 where it evaporates and cools the cooler 1. Further, the microcomputer 25 has a relay R
2 and the relay R4 are closed to operate the condenser cooling fan 22 while supplying water, and the relay R3 is closed to operate the circulation pump 9 to move the water in the water tank 6 from the fountain holes 3 to each ice making chamber 1A. The ice making operation is started by circulating.

After that, the microcomputer 25 judges whether or not 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. Further, the microcomputer 25 uses the sensor 26 to cool the cooler 1
When the temperature reaches, for example, 0 ° C., the microcomputer 25 starts the integration of the ice making timer having the function.

By the ice making operation, the ice making chamber 1 of the cooler 1
When ice is gradually generated in A and the integrated value of the ice making timer is timed 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 9 To stop. Next, the relays R5 and R7 are closed, and
The switching relay R6 is closed to the contact a side, the deceleration motor 10 is rotated in the normal direction, the tilting of the water tray 5 is started, and the hot gas solenoid valve 23 is opened to circulate the hot gas in the evaporation pipe 2 to cool the cooler 1. Is heated and the frozen ice in the ice making chamber 1A is transferred to the ice removing step.

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, the water tray position detecting switch AS by the microcomputer 25 will be described with reference to the flowchart of FIG.
The operation failure detection operation of W will be described. In each of the operation steps, the tilting time of the water tray 5 by the reduction motor 10 (the time required to reach from the horizontal closed position to the tilt open position) and the return time (required to reach from the tilt open position to the horizontal close position). Time) is, for example, 50 when the power supply AC is 50 HZ
Seconds. Therefore, the microcomputer 25 determines in step S20 of FIG. 8 whether or not the water tray 5 has started the tilting or returning motion, and if it has started, in step S21 the microcomputer 25 has a defect as its function. Count the detection timer. Next, in step S22, it is determined whether the water tray position detection switch ASW is tilted or reversed to the return side, and if not, step S2
In 3, it is determined whether the count of the defect detection timer has reached 60 seconds, and if not, the process returns to step S21 and is repeated.

If the water tray position detection 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 detection 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 detection switch ASW being reversed from the start of the operation of the water tray 5, it is apparent that the water tray position detection switch ASW has malfunctioned and the drive cam 17 The first arm 17A or the second arm 17B is a water tray position detection switch AS.
Moving past W and moving for 10 seconds. In that case,
The water tray position detection switch ASW cannot detect the horizontal closed position or the tilted open position of the water tray 5, and if left unattended, it will also cause damage to other devices.

Therefore, if the water tray position detection switch ASW does not reverse even after 60 seconds have passed from the start of the 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. Etc. to stop other equipment and prevent damage to them.
Next, in step S26, an alarm is issued by the alarm lamp 27 to notify the user that an operation failure of the water tray position detection switch ASW has occurred. Next, in step S27, the deceleration motor 10 is reversely rotated for 5 seconds (reverse of the rotational direction until 60 seconds elapse), and again forwardly rotated for 5 seconds (rotational direction until 60 seconds elapse).

As a result, the first arm 17A or the second arm 17B (water tray 5) passes through the water tray position detecting switch ASW, and then the water tray position detecting switch ASW is not reversed again (55). The tilting movement is repeated in small increments within the range of 60 seconds. Therefore,
The tilting movement of the water tray 5 allows the user to easily confirm the malfunction of the water tray position detection switch ASW and repair it. In particular, since the water tray 5 repeats tilting movement within a range in which the water tray position detection switch ASW does not reverse, the water tray position detection switch ASW is not damaged.

The case where the contact type water tray position detecting switch ASW is used has been described above. However, 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.
The malfunction detection operation of the water tray position detection switch ASW by the microcomputer 25 in such a case will be described with reference to the flowchart of FIG. In each of the operation steps, the tilting time and the returning time of the water tray 5 by the deceleration motor 10 are 50 seconds when the power source AC is 50HZ. The microcomputer 25 executes step S28 in FIG.
Similarly, it is determined whether or not the water tray 5 has started the tilting or returning operation, and if it has started, the defect detection timer is counted in step S29. Next, in step S30, it is determined whether or not the contact of the water tray position detection switch ASW is tilted or reversed, and if not, whether or not the count of the defect detection timer reaches 60 seconds in step S31. If not, the process returns to step S29 and is repeated.

If the contact of the water tray position detection switch ASW is reversed before 60 seconds have elapsed from the start of operation of the water tray 5, the microcomputer 25 determines that the water tray position detection switch ASW has no malfunction. After making a determination, the process proceeds from step S30 to step S32 to clear the defect detection timer, cancel the forced stop of other devices in step S33, and stop the alarm in step S34.

However, when 60 seconds have passed since the contact of the water tray position detecting switch ASW was not reversed since the operation of the water tray 5 was started, the operation of the water tray position detecting switch ASW is obviously defective due to, for example, dirt on the lens. The first arm 17A or the second arm 17B of the drive cam 17 moves for 10 seconds after passing through the optical path of the water tray position detection switch ASW.

Therefore, when the contact of the water tray position detection switch ASW does not reverse even after 60 seconds have elapsed from the start of the operation of the water tray 5, the microcomputer 25 proceeds to step S31.
To step S35, it is determined whether or not this is the second time, and if not, the process proceeds to step S36 to clear the defective timer. Next, in step S37, the deceleration motor 1
0 is reversely rotated (reverse of the rotation direction until 60 seconds have passed), and the water tray 5 is reversely operated. Then, in step S38, the defect timer is counted, and in step S39, it is determined whether or not the defect timer count reaches 60 seconds, and the reverse operation is continued until the count is reached. Then, after 60 seconds have elapsed, when the water tray 5 returns to the state (horizontal closed position or tilt open position) before the operation is started, the process proceeds to step S40, the defective timer is cleared, and the deceleration motor 10 is restarted at step S41.
Is reversely rotated (reverse of the rotation direction until the last 60 seconds elapse, that is, the first rotation direction).

Then, returning to step S28, the operation detection of the water tray position detection switch ASW is started again. And before the elapse of 60 seconds, the water tray position detection switch ASW
If is reversed, the microcomputer 25 determines that the operation has returned to normal operation due to a temporary malfunction, and the process proceeds from step S30 to step S32 to return to normal operation.

On the other hand, if the contact of the water dish position detection switch ASW does not reverse even after 60 seconds have passed again in step S31, the process proceeds to step S35, and this time is the second time, so the process proceeds to step S42 and the circulation pump 9 And other devices such as the compressor 21 are forcibly stopped to prevent damage to them. Next, in step S43, the alarm lamp 27
Alerts the user, and the water tray position detection switch AS is displayed to the user.
Notify that a malfunction of W has occurred. Next, step S
After proceeding to 36, the tilting movement of the water tray 5 (horizontal closing position and tilting open position) is similarly repeated.

Even when the water tray position detection switch ASW normally operates in step S30 during the subsequent tilting movement,
The procedure proceeds from step S30 to step S32 and step S33 to cancel the forced stop of the other device, and then to step S3.
At 4, the alarm operation by the alarm lamp 27 is stopped. As a result, the microcomputer 25 thereafter returns to normal operation.

As described above, in the microcomputer 25, when the water tray position detecting switch ASW is a non-contact type such as an optical type, when the water tray position detecting switch ASW fails to operate, If the water tray 5 is returned to the above state, and if it tilts or retreats again to operate normally, it will return to normal operation and continue, so the water tray position is temporarily detected due to dirt or the like. Switch AS
When W becomes malfunctioning, the normal state can be restored and the operation can be continued.

Particularly, when the water tray 5 is tilted or moved back again to return to the normal state, the alarm operation by the alarm lamp 27 is stopped, so that even if a temporary malfunction occurs, the operation can be performed without any trouble thereafter. It can be continued. Then, when the water tray position detection switch ASW is completely out of order, the alarm is continued and the user can quickly recognize it, and at that time, the water tray 5 repeats the tilting movement. Therefore, the user can quickly recognize that the water tray position detection switch ASW is malfunctioning.

[0047]

As described above in detail, according to the invention of claim 1, when the tilting time of the water tray exceeds a normal value from the start of the operation until the water tray position detection switch is reversed, control is performed. Since the means repeats the tilting movement of the water tray within the range in which the water tray position detecting switch does not reverse again, if the water tray position detecting switch malfunctions, the water tray will tilt in small increments. repeat. Therefore, the user can easily confirm the malfunction of the water tray position detection switch by the tilting movement of the water tray, and the quick and appropriate repair can be performed. Further, since the water tray repeats tilting movement within a range in which the water tray position detection switch does not reverse, damage to the water tray position detection switch can be prevented especially when the water tray position detection switch is a contact type.

According to the second aspect of the present invention, when the tilting time of the water tray exceeds a normal value from the start of operation until the non-contact type water tray position detection switch is reversed, Is returned to the state before the operation is started and tilted or returned again, so that when the water tray position detection switch temporarily malfunctions due to dirt or the like, the tilting is performed again so that the water pan position detection switch operates normally. After that, the ice making machine will be able to return to normal operation and continue.

In particular, according to the third aspect of the present invention, in the above, when the tilting movement time exceeds the normal value, the control means executes a predetermined alarm operation, so that the user operates the water tray position detection switch. You can quickly recognize defects,
When the water tray is tilted or moved back again to return to the normal state, the alarm operation is stopped. Therefore, in the case of the temporary malfunction as described above, the operation can be continued without any trouble. Is.

[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 partially cutaway side view of the ice making machine.

FIG. 3 is a flowchart showing a program of a microcomputer.

FIG. 4 is a flowchart showing a program of the same microcomputer.

FIG. 5 is an operation process diagram of the ice maker.

FIG. 6 is likewise an operation process chart of the ice making machine.

FIG. 7 is also an operation process chart of the ice maker.

FIG. 8 is a flowchart showing a program of a microcomputer regarding detection of a malfunction of the water tray position detection switch.

FIG. 9 is a flow chart showing another program of the microcomputer regarding detection of malfunction of the water tray position detection switch.

[Explanation of symbols]

 ASW Water tray position detection switch I Ice maker 1 Cooler 1A Ice maker 2 Evaporation pipe 3 Fountain hole 5 Water tray 9 Circulation pump 10 Reduction motor 17 Drive cam 17 17A First arm 17B Second arm 20 Controller 21 Compressor 25 microcomputer

Claims (3)

[Claims] 1. A circulation pump provided with a cooler in which a large number of downwardly opening ice making chambers are defined and formed, and a tiltable water tray for closing each ice making chamber, and a fountain hole formed in the surface of the water tray. By performing an ice making process by spraying water into each ice making chamber, in an ice making machine that heats the cooler to perform an ice removing process, a drive device that tilts and tilts the water tray, and is reversed by movement of the water tray, A water tray position detecting switch for detecting a predetermined tilt open position and a horizontal closed position of the water tray, and a control means for controlling the drive device, the circulation pump and other devices based on the reversing operation of the water tray position detecting switch. And a time limit means for accumulating the tilting time of the water tray, wherein the control means is based on the time limit means, and the tilting time of the water tray is from the start of operation to the water tray position detection switch. If the value exceeds the normal value until An ice making machine characterized in that the tilting movement of the water tray is repeated within a range in which the water tray position detection switch does not reverse. 2. A circulation pump provided with a cooler in which a large number of downwardly opening ice making chambers are defined and formed, and a tiltable water tray for closing each ice making chamber, and a fountain hole formed in the surface of the water tray. By performing an ice making process by spraying water into each ice making chamber, in an ice making machine that heats the cooler to perform an ice removing process, a drive device that tilts and tilts the water tray, and is reversed by movement of the water tray, A non-contact type water tray position detection switch for detecting a predetermined tilt open position and a horizontal closed position of the water tray, and controls the drive unit, the circulation pump and other devices based on the reversing operation of the water tray position detection switch. When the tilting time of the water tray exceeds a normal value from the start of operation to the time when the water tray position detection switch is reversed, the control means is provided with In, return the water tray to the state before the start of operation, An ice making machine characterized by tilting or returning again. 3. The control means executes a predetermined alarm operation when the tilting time exceeds a normal value, and tilts or moves the water tray again to restore the normal state.
The ice machine according to claim 2, wherein the alarm operation is stopped.