JP2000199663A - Protecting device for auger type ice making machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent surely an ice making cylinder of an auger type ice making machine from being iced. SOLUTION: A power supply voltage circuit for a geared motor GM for driving an auger screw for an auger type ice making machine and a refrigerant compressor CM is provided with a low voltage sensor VS. According to this method, where the low voltage sensor VS has detected that the voltage of the power supply voltage circuit is lowered to a value lower than a given value, a normally-open contact X61, closed until this time, is intercepted and the operation of the geared motor GM and the refrigerant compressor CM is stopped whereby the ice making operation of the auger type ice making machine is stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for protecting an apparatus in an auger type ice making machine by preventing ice from forming in an ice making cylinder as an evaporator.

[0002]

2. Description of the Related Art In an auger-type ice making machine, if ice accumulates in the ice making cylinder for some reason, the heat exchange performance of the cylinder is greatly reduced, and the refrigerant in the evaporating tube wound around the ice making cylinder is vaporized. If the liquid refrigerant is sucked into the compressor, the compressor may fail, while the reduction ratio of the gear motor driving the auger screw is extremely high. If the gear motor is suddenly restrained due to the above-mentioned icing during the operation of the gear motor, a repulsive force is generated by the impact between the reduction gears, so that a very large torque acts in the reverse direction, and as a result, the back of the entire gear motor is reduced. The gear motor rotates reversely by the amount of the rush, and at that time, the output shaft is restrained again.
The same large torque acts in the normal rotation direction, causing a hunting phenomenon in which these are repeated, which is one of the causes of damage to the auger screw rotating in the ice making cylinder.

[0003] On the other hand, when icing occurs in the ice making cylinder of the auger type ice making machine, the load of the gear motor driving the auger screw increases, and the current flowing through the gear motor increases. As exemplified in Japanese Patent Publication No. Hei 4-24625, the operation of the auger type ice maker is stopped when the increased current value is detected. However, the supply voltage to the auger type ice maker abnormally decreases. By doing so, the gear motor that drives the auger screw is stopped, but if the compressor continues to run and the ice is frozen, the current value is unlikely to rise to the set value due to the low voltage. There was a problem that the operation stop of the ice making machine became uncertain.

[0004] Further, when ice starts to form in the ice making cylinder of the auger type ice making machine, the heat exchange performance in the ice making cylinder is greatly reduced, and the temperature of the refrigerant in the evaporating tube is abnormally lowered. When this temperature drop is detected by a temperature thermostat or the like, the operation of the auger icemaker may be stopped.However, in this case, the operation of the auger icemaker is stopped immediately before the occurrence of icing. A large load is applied to the gear motor that drives the auger screw until the temperature drop is detected. If such a phenomenon is repeated, the repetitive force may damage the ice making mechanism. There is.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to surely prevent ice from forming in an ice making cylinder in an auger type ice making machine.

[0006]

SUMMARY OF THE INVENTION Therefore, a protective device for an auger type ice making machine according to the present invention is provided in an auger type ice making machine having a gear motor for driving an auger screw in an ice making cylinder. An auger-type ice maker when a low-voltage sensor is provided in a low-voltage circuit connected to the voltage circuit and the low-voltage sensor detects that the voltage of the power supply voltage circuit or the low-voltage circuit has become equal to or lower than a predetermined value; Is stopped or stopped.

That is, when the low-voltage sensor detects that the voltage of the power supply voltage circuit or the low-voltage circuit has become equal to or lower than a predetermined value, the operation of the auger-type ice making machine is stopped or stopped. Is abnormally lowered, the gear motor driving the auger screw is stopped, and the operation of the compressor is continued, so that it is possible to easily prevent ice from occurring in the ice making cylinder, and
When the compressor is started when the power supply voltage circuit is low voltage, it is possible to reliably suppress the large vibration of the compressor, which is often seen when the compressor is started. It is possible to prevent the motor from stopping and hindering the operation of the auger type ice making machine.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention shown in the drawings will be described by assigning the same reference numerals to the same parts. FIG. 1 is a control sequence circuit for a gear motor GM for driving an auger screw of an auger type ice making machine and a refrigerant compressor CM, and an ice making switch S
1, ice storage switch S2, proximity switch S3, float switch FS, electromagnetic switch MS1 of gear motor GM, electromagnetic switch MS2 of compressor CM, pressure switch PS,
Bi-power relays X1 to X7, anti-phase relay RX, transformer TR, timer board TB, cleaning timer TM, anti-phase indicator L1, overload indicator L2, cleaning lamp L3, abnormality indicator L4, rectifier D, water supply valve WV1, cleaning water valve WV2, discharge pipe thermo-Th1, heater thermo-Th2, fan motor FM, condenser C, melting ice heater H, low voltage sensor VS, etc. are provided.

That is, normally, the bi-power relay X6 is excited by the voltage in the power supply voltage circuit, and the normally open contact X61 in the power supply voltage circuit is closed. Therefore, when the ice making switch S1 is closed, the ice making water tank is closed. When the ice making water is sufficiently stored in the tank and the float switch FS is closed, the bi-power relay X3 is excited to close the normally open contact X31. At this time, the ice storage amount of the ice storage tank is insufficient and the ice storage switch S2 is closed. The bi-power relays X1 and X2 of the timer board TB are energized and the normally open contacts X11 and X21
Is closed, the gear motor GM and the refrigerant compressor CM are started, and the normal ice making operation by the auger type ice making machine is performed.

On the other hand, the low-voltage sensor VS has a stop voltage in which the voltage of the power supply voltage circuit is, for example, 30% lower than the rated voltage of 200 V, and a return voltage which is higher than the stop voltage and does not hinder the ice making operation. When the voltage of the power supply voltage circuit decreases to the stop voltage for some reason, the low-voltage sensor VS detects this and the circuit of the bi-power relay X6 is opened. Is demagnetized and the normally open contact X61 is opened, so that the operation of the gear motor GM and the refrigerant compressor CM is stopped, and the ice making operation of the auger type ice making machine is stopped urgently, or the auger type ice making machine itself enters the ice making operation. Stop entering. The bi-power relay X7 of the timer board TB
Is for the segment display section.

[0011] Therefore, a problem that the gear motor GM for driving the aug screw is stopped due to the abnormal drop of the voltage of the power supply voltage circuit and the operation of the compressor CM continues to cause the ice to stick is caused by the auger type ice making. Can be easily prevented by the above-mentioned emergency stop of the ice making operation, and furthermore, by detecting the stop voltage of the low voltage sensor VS,
Prior to the occurrence of ice in the ice making cylinder of the auger type ice machine during the ice making operation, the ice making operation of the auger type ice machine is stopped, and the problem of ice sticking can be reliably solved. By preventing a failure or breakage of the auger screw due to a hunting phenomenon of the load torque, the maintainability of the auger type ice making machine can be greatly improved, and its long-term good operation can be ensured.

When the ice making switch S1 is closed to start the ice making operation, the auger type ice making machine does not operate. Therefore, when the compressor is started when the power supply voltage circuit is at a low voltage, a large vibration of the compressor is often observed. It is possible to reduce the risk of damage to the piping and leakage of refrigerant due to unexpectedly large stress acting on the piping connected to the compressor. Can be eliminated.

[0013] Further, it is possible to prevent various motors such as a water supply motor and a drain motor around the auger type ice making machine from being stopped due to a low voltage of the power supply voltage circuit, thereby preventing the operation of the auger type ice making machine from being hindered. There is a feature that can be.

When the voltage of the power supply voltage circuit, which has been abnormally lowered, recovers to the return voltage, the low voltage sensor VS detects this and demagnetizes the bi-power relay X6, and the normally closed contact X61 is closed. The gear motor GM and the refrigerant compressor CM automatically start operating, and the auger type ice making machine can restart the ice making operation, which is very convenient. By appropriately delaying the excitation and demagnetization of the bi-power relays X1 and X2 by an appropriate delay device provided on the timer board TB, a chattering phenomenon in which the stop and return of the gear motor GM and the refrigerant compressor CM are repeated instantaneously is prevented. Have been.

In the embodiment shown in FIG. 2, a low-voltage circuit in which the rated voltage of the power supply voltage circuit is reduced from 200 V to 24 V by a transformer TR is provided with a low-voltage sensor VS, a discharge pipe thermo-Th1, a bi-power relay X4, and a normally open circuit. There is no particular difference from the above-described embodiment except that the contact 43 is arranged. In this case, the low-voltage sensor VS has a low-voltage circuit voltage of, for example, a stop voltage 30% lower than the rated voltage of 24 V and a stop voltage. It is possible to detect a return voltage which is higher and does not hinder the ice making operation.

For this reason, when the voltage of the low-voltage circuit decreases to the stop voltage for some reason, the low-voltage sensor VS detects this, and the circuit of the bi-power relay X6 is opened. Gear motor G
The operation of the M and the refrigerant compressor CM is stopped, the ice making operation of the auger type ice making machine is stopped urgently, or the auger type ice making machine itself is prevented from entering the ice making operation, and the power supply which has been abnormally lowered is stopped. When the voltage of the voltage circuit recovers to the reset voltage, the low-voltage sensor VS detects this and closes the circuit of the bi-power relay X6, and the gear motor GM and the refrigerant compressor CM are closed as in the case of the above-described embodiment.
Automatically starts operating, and the auger-type ice making machine can resume the ice making operation.

Therefore, since an abnormal decrease in the power supply voltage circuit voltage can be detected by the decrease in the low voltage circuit voltage, the same operation and effect as those of the above embodiment can be obtained.
Even though the voltage of the power supply voltage circuit varies from country to country and region around the world, the voltage of the low-voltage circuit is 24 V
Therefore, there is an advantage that the structure of the protection device can be commonly used in various parts of the world and can contribute to cost reduction.

In each of the above embodiments, when the low voltage sensor VS detects the stop voltage, the ice making operation of the auger type ice making machine is stopped or stopped. The detection of the abnormal decrease can be performed by a program circuit of the microcomputer.

That is, the AC voltage of the power supply voltage circuit or the low voltage circuit is rectified, and as shown in the control flowchart of FIG.
It is constantly monitored whether 1 is greater than the stop voltage V2,
If V1> V2, step S1 is repeated.
If .ltoreq.V2, the process proceeds to the next step S2.

In step S2, it is checked by a time-measuring means such as a timer as to whether or not the time T during which the state continues from the time when V1.ltoreq.V2 exceeds a predetermined time T1, for example, 90 seconds. If the time has not reached the predetermined time T1, the process returns to the step S1, but if the low voltage duration time T exceeds the predetermined time T1, the process proceeds to the step S3.

In step S3, the bi-power relay X6 that has been excited is demagnetized, the normally open contact X61 is opened, the operation of the gear motor GM and the refrigerant compressor CM is stopped, and the ice making operation of the auger type ice making machine is started. The operation is stopped, and the process proceeds to the next step S4.

In step S4, it is checked whether the rectified voltage V1 has recovered to the return voltage V3. If the rectified voltage V1 has not recovered to the return voltage V3, the control flow ends, but the control flow returns to the return voltage V3. If so, the process proceeds to step S5.

In step S5, it is checked whether or not the time T2 during which the state continues from the time when V1.gtoreq.V3 has exceeded a predetermined time T3, for example, 90 seconds, and if the duration T2 has not reached the predetermined time T3. Step S5 is repeated, but if the duration T2 exceeds the predetermined time T3, the process proceeds to step S6.

In step S6, the bi-power relay X6 which has been demagnetized is energized to close the normally open contact X61. Therefore, if various conditions such as closing of the switch S1 are satisfied, the gear motor GM and the refrigerant compressor When the operation of the CM starts, the ice making operation of the auger ice maker is automatically restarted.

Accordingly, even if the voltage of the power supply voltage circuit temporarily drops when the motors such as the refrigerant compressor CM start, the drop is recovered within the predetermined time T1, and the protection device is started by the above-mentioned starting operation. The protection device can be activated for the first time when the voltage of the power supply voltage circuit continuously drops for a predetermined time T1 or more, and the short-circuit time of about the predetermined time T1 can be avoided. In the case of the voltage drop in the above, no icing occurs in the ice making cylinder.
And the operation of the refrigerant compressor CM is stopped, and the ice making operation of the auger type ice making machine is stopped urgently, or the auger type ice making machine itself is stopped from entering the ice making operation, and the same operation as the above-described respective embodiments is performed. In addition to the effect, the chattering phenomenon in which the stop and return of the ice making operation in the auger type ice making machine are repeated instantaneously can be easily prevented.

Further, the rectified voltage V1 of the power supply voltage circuit or the low voltage circuit is restored to the return voltage V3 which does not hinder the ice making operation of the auger type ice making machine, and the voltage recovery continues for a predetermined time T3 or more. Then, the ice making operation of the auger-type ice making machine can be automatically restarted, which is very convenient, and the occurrence of the chattering phenomenon can be easily prevented by monitoring the predetermined time T3. Absent.

On the other hand, in the embodiment of FIG. 2 and the embodiment in which the circuit of the water supply valve WV1 and the circuit of the washing water valve WV2 are connected to the low voltage circuit as shown in FIG. The ice making operation is stopped and started by the low-voltage sensor VS using a microcomputer circuit in the board as shown in FIG.
It is also possible to control based on the control flowchart of FIG.

That is, in step S10, the segment display unit and the gear motor GM connected to the low-voltage circuit
And control circuit of refrigerant compressor CM, water supply valve WV
1. Whether the operating condition of the electric equipment such as the washing water valve WV2 which consumes a relatively large amount of electric power satisfies the low voltage detection condition, for example, whether the control circuit of the refrigerant compressor CM is operating in FIG. In FIG. 4, it is checked whether the control circuit of the refrigerant compressor CM is operating and whether the water supply valve WV1 or the washing water valve WV2 is operating, or whether any of the above-mentioned electric devices is not operating. If the low voltage detection condition is not satisfied, step S10 is repeated. If the low voltage detection condition is satisfied, the process proceeds to the next step S11.

In step S11, the elapsed time t from the start of the establishment of the low voltage detection condition is a predetermined time, that is, the time t1 at which the fluctuation of the voltage generated in the low voltage circuit by the start of the establishment of the low voltage detection condition converges. It is checked whether the elapsed time has exceeded the predetermined time t1. If the elapsed time t has not reached the predetermined time t1, step S11 is repeated. If the elapsed time t exceeds the predetermined time t1, the process proceeds to step S12.

In step S12, step S1 in FIG.
The same control as that described above is performed, and the subsequent steps S13 to S17 are performed corresponding to steps S2 to S6 in FIG. 3, respectively. However, a state in which a plurality of the electric devices are connected to the low-voltage circuit and each of them repeatedly operates and deactivates, so that the low-voltage continuation time T of the low-voltage circuit is detected when the low-voltage detection condition is satisfied. The state in which the detection is stopped appears alternately.
, The rectified voltage V1 in the low-voltage circuit is equal to or less than the predetermined time T2 of the stop voltage V2.
In case A where the low-voltage detection holding time exceeding 1 completely falls within the above-described detection state of one time, the operation of stopping and starting the operation of the ice making device is performed as shown in FIGS. 3 and 5. In cases B to E in which the voltage detection holding time is in the above detection stop state, it is assumed that the low voltage state of the low voltage circuit is not detected, and the control of the stop and start of the operation of the ice making device as shown in FIGS. Is not done.

That is, for example, the control circuit of the refrigerant compressor CM operates in FIG.
When the ice making is being performed by operating the M, the gear motor GM is also operating, and in the case of the auger type ice making machine,
During the operation of the refrigerant compressor CM, the state change does not easily occur in other electric devices connected to the low-voltage circuit, so that the voltage change in the low-voltage circuit is usually small, and the control circuit of the refrigerant compressor CM operates in FIG. And
If the water supply valve WV1 or the washing water valve WV2 is not operated, the state change does not easily occur in other electric devices connected to the low voltage circuit, and the voltage change in the low voltage circuit is usually small, and further, the low voltage is low. Since none of the electric devices connected to the circuit are operating, the voltage change in the low-voltage circuit is usually small, and therefore, only when such a low-voltage detection condition is satisfied, Abnormal voltage drop at, for example, 6
Since the low-voltage sensor VS can reliably detect the drop to about 0%, even if the voltage in the low-voltage circuit temporarily drops when there is no change in the power supply voltage, Can always be detected very accurately. Therefore, similarly to the above-described embodiments, the ice making operation of the auger type ice making machine is urgently stopped by stopping the operation of the gear motor GM and the refrigerant compressor CM, or Further, the auger-type ice making machine itself is prevented from entering the ice making operation, and it is possible to achieve more excellent operational effects than those of the above embodiments.

In addition, a transformer dedicated to the low-voltage circuit to which the low-voltage sensor VS is connected is provided in preparation for a large change in the voltage of the low-voltage circuit according to the operating condition of the electric equipment connected to the low-voltage circuit. There is no need to perform this operation, and only one transformer needs to be installed for the low-voltage circuit. This is advantageous not only in cost and space, but also in the case where the Low voltage sensor VS with the same specifications can be used in low voltage circuits with the same specifications in low voltage circuits that have a common voltage worldwide, even if they differ depending on the country or region of the world. There is an advantage that can be done.

In the case A where the low-voltage detection holding time is completely within the above-described detection state of one time, the operation stop and the operation start of the ice making device are controlled, and in the other cases BE, the ice making device is controlled. In any case, since the low-voltage circuit does not detect the low-voltage state, the operation of stopping and starting the operation of the ice making device is not performed. Therefore, the malfunction of the low-voltage sensor VS is prevented, and the power supply voltage or the low voltage is controlled. Since an abnormal decrease in the circuit voltage can be reliably detected and the operation stop and operation start of the ice making device can be accurately controlled,
Very convenient for practical use.

[0034]

According to the protection device of the auger type ice making machine of the present invention, when the low voltage sensor detects that the voltage of the power supply voltage circuit or the low voltage circuit has become equal to or less than a predetermined value, the auger type ice making machine is protected. When the operation of the machine is stopped or stopped, ice in the ice making cylinder due to abnormally low power supply voltage circuit voltage can be easily prevented. Breakage, etc. can be avoided, and the occurrence of large vibrations when starting the compressor can be reliably suppressed.Moreover, various motors around the auger type ice making machine stop due to abnormal voltage drop of the power supply voltage circuit. , Because it can prevent the risk of hindering the operation of the auger ice machine, greatly improving the maintainability of the auger ice machine,
Good long-term operation can be secured.

[Brief description of the drawings]

FIG. 1 is a control sequence circuit diagram according to an embodiment of the present invention.

FIG. 2 is a control sequence circuit diagram according to another embodiment of the present invention.

FIG. 3 is a control flowchart according to another embodiment of the present invention.

FIG. 4 is a control sequence circuit diagram according to another embodiment of the present invention.

FIG. 5 is a control flowchart in the embodiment of the present invention.

FIG. 6 is a control explanatory diagram in the embodiment of the present invention.

[Explanation of symbols]

 GM Gear motor CM Refrigerant compressor X1 to X7 Relay VS Low voltage sensor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukimasa Takeda 3-16 Hoshizaki Electric Co., Ltd., Sakaemachi Minamikan, Toyoake City, Aichi Prefecture (72) Inventor Shigeaki Tamaki 3rd 16th Sakaemachi Minamikan, Toyoake City, Aichi Prefecture Inside

Claims (4)

[Claims] An auger type ice making machine having a gear motor for driving an auger screw in an ice making cylinder.
A low-voltage sensor is provided in the power supply voltage circuit or a low-voltage circuit connected to the power supply voltage circuit, and the low-voltage sensor detects that the voltage of the power supply voltage circuit or the low-voltage circuit has become equal to or less than a certain value. An auger ice maker protection device configured to stop or stop the operation of the auger ice maker at times. 2. An auger type ice making machine having a gear motor for driving an auger screw in an ice making cylinder.
A low-voltage sensor is provided in the low-voltage circuit connected to the power supply voltage circuit, and the voltage of the low-voltage circuit is equal to or less than a certain value only during a specific operation state of another electric device connected to the low-voltage circuit. An auger-type ice maker protection device configured to stop or stop the operation of the auger-type ice maker when the low-voltage sensor detects that the operation has been completed. 3. The low-voltage sensor according to claim 1, wherein the low-voltage sensor detects that the voltage of the power supply voltage circuit or the low-voltage circuit has become a predetermined value or less, and the low voltage has continued for a predetermined time. An auger-type ice maker protection device configured to stop or stop the operation of the auger-type ice maker when the time measuring means detects that. 4. The method according to claim 1, wherein when the voltage of the power supply voltage circuit or the low voltage circuit which has become equal to or less than a predetermined value is restored to a predetermined return voltage,
An auger-type ice maker protection device configured to automatically restart operation of the auger-type ice maker.