JP4445601B2 - Protective device for auger ice machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for protecting equipment by preventing the occurrence of ice in an ice making cylinder as an evaporator in an auger type ice making machine.
[0002]
[Prior art]
In an auger type ice maker, if ice is generated in the ice making cylinder for some reason, the heat exchange performance in the cylinder is greatly reduced, so that the refrigerant in the evaporation tube around which the ice making cylinder is wound cannot be completely vaporized. If the liquid refrigerant is sucked into the compressor, the compressor may fail. On the other hand, the gear motor that drives the auger screw has an extremely large reduction ratio. If the gear motor is suddenly restrained due to the above-mentioned ice during operation, a repulsive force due to an impact is generated between the reduction gears, and a very large torque acts in the reverse direction. As a result, the gear motor is moved by the backlash of the entire gear motor. Reverse rotation will cause the output shaft to be restrained again, so the same large torque will act in the forward direction. , Happening hunting phenomenon which they are repeated, Augustine Kurio rotating in the ice-making cylinder had become a cause of breakage.
[0003]
On the other hand, when ice is generated in the ice making cylinder of the auger type ice making machine, the load of the gear motor that drives the auger screw is increased and the current value flowing through the gear motor is increased. As exemplified in Japanese Patent No. 24625, the operation of the auger type ice maker was stopped when this increased current value was detected, but the supply voltage to the auger type ice maker was abnormally lowered. The gear motor that drives the auger screw stops, but if the compressor is frozen due to continued operation, the current value is unlikely to rise to the set value due to the low voltage. There was a problem that the shutdown was uncertain.
[0004]
In addition, when ice begins to occur in the ice making cylinder of an auger type ice making machine, the heat exchange performance in the ice making cylinder is greatly reduced, so the refrigerant temperature in the evaporator tube drops abnormally. However, in this case, the operation of the auger ice maker is stopped just before the occurrence of ice, so the temperature thermo A great load is applied to the gear motor that drives the auger screw until the decrease is detected. When such a phenomenon is repeated, the ice making mechanism may be damaged by the repeated force.
[0005]
[Problems to be solved by the invention]
An object of the present invention is to reliably prevent the occurrence of ice in an ice making cylinder in an auger type ice making machine.
[0006]
[Means for Solving the Problems]
For this reason, the protection device for an auger type ice making machine according to the present invention is a power supply voltage circuit or a low voltage circuit connected to the power supply voltage circuit in an auger type ice making machine having a gear motor for driving an auger screw in an ice making cylinder. When the low voltage sensor detects that the voltage of the power supply voltage circuit or the low voltage circuit is below a certain value, the operation of the auger type ice making machine is stopped or stopped. It is configured.
[0007]
That is, when the low voltage sensor detects that the voltage of the power supply voltage circuit or the low voltage circuit is below a certain value, the operation of the auger type ice making machine is stopped or stopped, so that the voltage of the power supply voltage circuit becomes abnormal. By lowering, the gear motor that drives the auger screw stops and the compressor continues to operate, so that it is possible to easily prevent ice formation in the ice making cylinder and the power supply voltage circuit is low voltage. When the compressor is started, it is possible to reliably suppress the large vibrations of the compressor, and various motors around the auger type ice maker stop due to the low voltage of the power supply voltage circuit. The risk of hindering the operation of the ice making machine can be prevented.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the following, each embodiment of the present invention shown in the drawings will be described with the same reference numerals given to the equivalent parts.
FIG. 1 shows 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. The ice making switch S1, the ice storage switch S2, the proximity switch S3, the float switch FS, and the electromagnetic opening and closing of the gear motor GM. MS1, electromagnetic switch MS2 of compressor CM, pressure switch PS, bi-power relays X1 to X7, reciprocal relay RX, transformer TR, timer board TB, cleaning timer TM, reciprocal indicator lamp L1, overload indicator lamp L2, Cleaning lamp L3, abnormality indicator lamp L4, rectifying element 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. Yes.
[0009]
That is, during normal operation, 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 filled with ice making water. Is sufficiently stored and the float switch FS is closed, the bi-power relay X3 is excited and the normally open contact X31 is closed. At this time, if 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 excited, the normally open contacts X11 and X21 are closed, the gear motor GM and the refrigerant compressor CM are activated, and the normal ice making operation by the auger type ice making machine is performed.
[0010]
On the other hand, the low voltage sensor VS detects a stop voltage in which the voltage of the power supply voltage circuit is 30% lower than the rated voltage 200 V, for example, and a return voltage that is higher than the stop voltage and does not interfere with ice making operation. If, for some reason, the voltage of the power supply voltage circuit decreases to the stop voltage, the low-voltage sensor VS detects this and the circuit of the bi-power relay X6 is opened, so that the bi-power relay X6 is demagnetized. Since 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 urgently stopped, or the auger type ice making machine itself enters the ice making operation. Stop. The bi-power relay X7 of the timer board TB is for the segment display section.
[0011]
Therefore, the problem that the ice motor is caused by the gear motor GM driving the auger screw being stopped and the compressor CM being continuously operated due to the abnormal drop in the voltage of the power supply voltage circuit is the auger type ice making operation. The auger type ice making machine can be easily prevented by the emergency stop, and the ice voltage is generated in the ice making cylinder of the auger type ice making machine during the ice making operation by detecting the stop voltage of the low voltage sensor VS. The ice making operation of the auger ice machine can be surely solved by preventing the failure of the compressor due to the suction of the liquid refrigerant and the damage of the auger screw due to the hunting phenomenon of the load torque. Maintainability can be greatly improved and good operation over the long term can be ensured.
[0012]
In addition, even if the ice making switch S1 is closed and the ice making operation is started, the auger type ice making machine does not operate. Therefore, the large vibration of the compressor, which is often seen when the compressor is started when the power supply voltage circuit is low, is generated. Since it is possible to suppress it reliably, it is easy to eliminate the possibility of unexpectedly large stress acting on the pipe connected to the compressor and damaging the pipe or leaking refrigerant. Can do.
[0013]
Furthermore, the low voltage of the power supply voltage circuit can stop various motors such as water supply motors and drainage motors around the auger type ice making machine and prevent the auger type ice making machine from operating. There is.
[0014]
Further, when the voltage of the power supply voltage circuit that has been abnormally reduced recovers to the return voltage, the low voltage sensor VS detects this, demagnetizes the bi-power relay X6, and the normally closed contact X61 is closed, so the gear motor GM And the refrigerant compressor CM starts automatically and the auger type ice making machine can restart the ice making operation, which is very convenient.
It should be noted that the excitation and demagnetization of the bi-power relays X1 and X2 are appropriately delayed by an appropriate delay device provided on the timer board TB so as to prevent the chattering phenomenon in which the gear motor GM and the refrigerant compressor CM are repeatedly stopped and returned instantaneously. Has been.
[0015]
In the embodiment shown in FIG. 2, a low voltage sensor VS, a discharge pipe thermostat Th1, a bipower relay X4, and a normally open contact 43 are provided in a low voltage circuit in which the rated voltage 200V of the power supply voltage circuit is dropped to 24V by the transformer TR. The low voltage sensor VS in this case has a stop voltage that is 30% lower than the rated voltage 24V, for example, and is higher than the stop voltage. A return voltage that does not interfere with ice making operation can be detected.
[0016]
For this reason, when the voltage of the low voltage circuit decreases to the stop voltage for some reason, this is detected by the low voltage sensor VS and the circuit of the bi-power relay X6 is opened, as in the above embodiment. The operation of the gear motor GM and the refrigerant compressor CM is stopped, the ice making operation of the auger type ice making machine is urgently stopped, or the auger type ice making machine itself is prevented from entering the ice making operation, and is abnormally lowered. When the voltage of the power supply voltage circuit recovers to the return voltage, the low voltage sensor VS detects this and the circuit of the bi-power relay X6 is closed, and the gear motor GM and the refrigerant compressor CM are closed as in the above embodiment. Starts automatically, and the auger ice maker can resume the ice making operation.
[0017]
Accordingly, since an abnormal drop in the power supply voltage circuit voltage can be detected due to a decrease in the low voltage circuit voltage, the same effect as the above embodiment can be obtained, while the voltage of the power supply voltage circuit is Although the voltage of the low voltage circuit is 24V in common throughout the world, the structure of the protective device can be commonly used in various parts of the world, and there is an advantage that it can contribute to cost reduction. .
[0018]
In each of the above embodiments, when the low voltage sensor VS detects a stop voltage, the ice making operation of the auger type ice making machine is stopped or stopped. Detection can be performed by a program circuit of a microcomputer.
[0019]
That is, the AC voltage of the power supply voltage circuit or the low voltage circuit is rectified, and as shown in the control flow chart of FIG. 3, whether or not the rectified voltage V1 is larger than the stop voltage V2 is always monitored in step S1, and V1 If> V2, step S1 is repeated. If V1 ≦ V2, the process proceeds to the next step S2.
[0020]
In step S2, whether or not the time T during which the state continues from the time when V1 ≦ V2 has exceeded a predetermined time T1, for example, 90 seconds, is checked by a timing means such as a timer, and the low voltage duration T is set to the predetermined time. If it has not reached T1, the process returns to step S1, but if the low voltage duration T exceeds the predetermined time T1, the process proceeds to step S3.
[0021]
In step S3, the bi-power relay X6 that has been energized so far 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 stopped. The process proceeds to the next step S4.
[0022]
In step S4, it is checked whether or not 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 is terminated, but if the rectified voltage V1 has recovered to the return voltage V3. Proceed to step S5.
[0023]
In step S5, it is checked whether or not the time T2 during which the state continues from the time when V1 ≧ V3 exceeds a predetermined time T3, for example, 90 seconds. If the time T2 has not reached the predetermined time T3, step S5 is executed. Again, if the duration T2 exceeds the predetermined time T3, the process proceeds to step S6.
[0024]
In step S6, the depowered bi-power relay X6 is energized and the normally open contact X61 is closed. Therefore, if various conditions such as closing of the switch S1 are satisfied, the operation of the gear motor GM and the refrigerant compressor CM is performed. The ice making operation of the auger type ice making machine is automatically resumed.
[0025]
Therefore, even if the voltage of the power supply voltage circuit temporarily decreases when the motors such as the refrigerant compressor CM are started, the reduction is recovered within a predetermined time T1, so that the protection device is activated by the start operation. Such a problem can be avoided reliably, and if the voltage of the power supply voltage circuit continuously decreases for a predetermined time T1 or more, the protective device is activated for the first time, and the voltage drop in a short time of about the predetermined time T1. In the ice making cylinder, no ice is formed, 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 urgently stopped, as in the case of each of the above embodiments, or The auger type ice making machine itself can be prevented from entering the ice making operation, and the same effects as the above embodiments can be obtained. Stop, there is an advantage that can easily prevent the occurrence of chattering phenomenon return is repeated instantly.
[0026]
If the rectified voltage V1 of the power supply voltage circuit or the low voltage circuit is restored to the return voltage V3 that does not interfere with the ice making operation of the auger type ice making machine, and the voltage recovery continues for a predetermined time T3 or more, Needless to say, the ice making operation of the auger type ice making machine can be automatically resumed, which is very convenient, and the occurrence of the chattering phenomenon can be easily prevented by monitoring the predetermined time T3.
[0027]
On the other hand, in the embodiment of FIG. 2 and in the embodiment in which the circuit of the water supply valve WV1 and the washing water valve WV2 is connected to the low voltage circuit as shown in FIG. 4, the low voltage disposed in the low voltage circuit. The stop and start of the ice making operation can be controlled by the sensor VS based on the control flowchart of FIG.
[0028]
That is, in step S10, the operation status of the electric devices with relatively large power consumption such as the segment display unit connected to the low voltage circuit, the control circuit for the gear motor GM and the refrigerant compressor CM, the water supply valve WV1, the washing water valve WV2, etc. Whether or not the low voltage detection condition is satisfied, for example, whether or not the control circuit of the refrigerant compressor CM is operated in FIG. 2, or the control circuit of the refrigerant compressor CM is operated in FIG. 4 and the water supply valve WV1 or washing It is checked whether or not the water valve WV2 is not operating, or whether any of the electrical devices is operating, and if the low voltage detection condition is not satisfied, step S10 is repeated. If the voltage detection condition is satisfied, the process proceeds to the next step S11.
[0029]
In step S11, whether or not the elapsed time t from the start of establishment of the low voltage detection condition exceeds a predetermined time, that is, the time t1 at which the fluctuation of the voltage generated in the low voltage circuit due to the start of establishment of the low voltage detection condition has converged. 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.
[0030]
In step S12, control equivalent to step S1 of FIG. 3 is performed, and subsequent steps S13 to S17 are respectively controlled corresponding to steps S2 to S6 of FIG.
However, a state in which a low voltage duration time T of the low voltage circuit is detected by the establishment of the low voltage detection condition in order that each of the plurality of electrical devices is connected to the low voltage circuit, and each of them repeatedly operates and deactivates, The state in which the detection is stopped alternately appears. As illustrated in FIG. 6 with circles, the low voltage exceeding the predetermined time T1 of the rectified voltage V1 ≦ the stop voltage V2 in the low voltage circuit. In case A where the detection holding time is completely within the above detection state, the ice making device is stopped and started as shown in FIGS. 3 and 5, but the low voltage detection holding time is controlled. In cases B to E related to the detection stop state, the control of the operation stop and start of the ice making device as shown in FIGS. 3 and 5 is not performed, assuming that the low voltage state of the low voltage circuit is not detected.
[0031]
That is, for example, when ice making is performed by operating the control circuit of the refrigerant compressor CM and operating the refrigerant compressor CM in FIG. 2, the gear motor GM is also operating. During the operation of the compressor CM, it is difficult for a state change to occur in other electrical equipment connected to the low voltage circuit. Therefore, 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 activated, the state change is unlikely to occur in other electrical devices connected to the low voltage circuit, and the voltage change in the low voltage circuit is usually small. Because none of the above electrical devices connected to the low voltage circuit is operating, normally the voltage change in the low voltage circuit is Therefore, the low voltage sensor VS reliably detects an abnormal voltage drop in the low voltage circuit, for example, a drop to about 60% of the normal voltage only when such a low voltage detection condition is satisfied. Therefore, even if the voltage in the low-voltage circuit temporarily drops when there is no change in the power supply voltage, this can always be detected very accurately. As in the case of the embodiment, by stopping the operation of the gear motor GM and the refrigerant compressor CM, the ice making operation of the auger type ice making machine is urgently stopped, or the auger type ice making machine itself is prevented from entering the ice making operation. It is possible to achieve more excellent operational effects than the above embodiments.
[0032]
Moreover, it is necessary to install a transformer dedicated to the low-voltage circuit to which the low-voltage sensor VS is connected in preparation for the voltage of the low-voltage circuit greatly changing according to the operating status of the electrical equipment connected to the low-voltage circuit. Since there is no need to install a single transformer for low-voltage circuits, not only cost and space are advantageous, but the voltage of the power supply voltage circuit is Low voltage sensor VS of the same specification can be used for low voltage circuits with the same voltage value in the world even at different regions, and can be used at low cost in common throughout the world. is there.
[0033]
Further, only the case A in which the low voltage detection holding time is completely within the above detection state is performed, the above-described operation stop and start control of the ice making device are performed, and the other cases B to E are all low. If the low voltage state of the voltage circuit is not detected, the operation stop and the start control of the ice making device are not performed, so that the low voltage sensor VS is prevented from malfunctioning and the power supply voltage or the low voltage circuit voltage is Abnormal drop can be reliably detected, and it is possible to accurately control the stop and start of operation of the ice making device, which is practically convenient.
[0034]
【The invention's effect】
In the protection device for an auger type ice making machine according to the present invention, the operation of the auger type ice making machine is stopped when the low voltage sensor detects that the voltage of the power supply voltage circuit or the low voltage circuit is below a certain value. Or, it can be prevented to easily prevent ice in the ice making cylinder due to an abnormal drop in the power supply voltage circuit voltage, thereby avoiding the failure of the compressor due to the suction of liquid refrigerant or the damage of the auger screw due to the hunting phenomenon of the load torque. In addition, the generation of large vibrations at the start of the compressor can be reliably suppressed, and various motors around the auger type ice machine are stopped due to an abnormal voltage drop in the power supply voltage circuit. As a result, the maintenance of the auger ice maker can be greatly improved to ensure good operation over the long term. Rukoto can.
[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 in 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 an explanatory diagram of control in the embodiment of the present invention.
[Explanation of symbols]
GM Gear motor CM Refrigerant compressor X1 to X7 Relay VS Low voltage sensor

Claims (4)

In 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 power supply voltage circuit or the low voltage An auger type ice making device protection device configured to stop or stop the operation of an auger type ice making machine when the low voltage sensor detects that the voltage of the circuit is below a certain value. In an auger type ice making machine equipped with a gear motor that drives an auger screw in an ice making cylinder, a low voltage sensor is provided in a low voltage circuit connected to a power supply voltage circuit, and other electric devices connected to the low voltage circuit An auger type configured to stop or stop the operation of the auger type ice making machine when the low voltage sensor detects that the voltage of the low voltage circuit is below a certain value only in a specific operating situation. Protection device for ice machine. 3. The time measuring means 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 machine protection device configured to stop or stop operation of an auger type ice machine when detected. 4. The operation of the auger type ice making machine is automatically performed when the voltage of the power supply voltage circuit or the low voltage circuit, which has become a predetermined value or less, recovers to a predetermined return voltage. Protective device for an auger ice machine configured to be resumed.

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