JPS5950035B2 - How to detect ice maker water outage - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ice-making machine that circulates ice-making water supplied in a tank to an ice-making member equipped with a refrigeration system to freeze ice between the end of an ice-making operation and the start of the next ice-making operation. In particular, the present invention is a water outage detection method that focuses on the fact that there is a large difference in refrigeration load when comparing normal times and water outages, which manifests as a difference in the cooling rate of ice making components. To provide a water cutoff detection method and a device for achieving this, which can be widely applied to various types of ice making machines as long as the ice making machine is configured to perform freezing by circulating water in a tank to an ice making member. It is something.

An embodiment of the present invention will be described below based on the drawings.

Fig. 1 shows one type of ice making machine equipped with the device of the present invention, in which 1 is an ice making machine body formed by a heat insulating wall, and an ice making member 3 to which a refrigeration system evaporation pipe 2 is connected is installed at an angle. Below that, there is a water storage tank 6 for storing ice-making water supplied from a water supply pipe 5 connected to a water source via a water supply valve 4, and a circulation pump 7 installed in the tank 6 to create a flowing water circulation type ice-making system. An ice sheet cutting heater device 9 is installed in front of the lower edge of the ice making member 3, and is located above the water storage chamber 8, and receives the dehydrated ice sheet and cuts it into blocks of ice of a predetermined size. It is placed.

The machine room 10 also has an electric compressor 11. A condenser 12, an air cooling fan 13, etc. for the condenser 12 are provided.

Next, the electric circuit of the present invention will be explained based on FIG.

14 is a temperature detecting device such as 1 to a transistor for detecting the temperature of the ice making member 3; 15 is a first judgment circuit that compares the set value by the first dividing resistor 16.17 with the detected value of the temperature detecting device 14; Then, when the detected value reaches the first reduced temperature, an output signal "°1" is generated.

18 is a second determination circuit that compares the set value by the second dividing resistor 19.20 with the detected value of the temperature detection device 14, and determines a second reduced temperature where the detected value is lower than the first reduced temperature. When the output signal 1 is reached, an output signal ``1'' is generated.

21 is a first AND circuit which receives the output signal of the first determination circuit 15 and a clock; 22 is a counter circuit 23;
A timer circuit configured by a comparator 24 and a memory circuit 25 uses a counter circuit 23 to count the clock output from the first AND circuit 21, and when the content of the clock 1 exceeds the set value of the memory circuit 25. Time comparator 2
4 generates an output signal °“1”.

26 is a reset I terminal of the counter circuit 23, which is reset by the output signal "0" of the first determination circuit 15.

27 is a one-shot multivibrator 12 that instantaneously generates a pulse output based on the output signal of the comparator 24.
8 is the output signal of the multivibrator 27 and the second
A second AND circuit which receives the output signal of the judgment circuit 18 as an input, and sends its output to the R-S flip-flop 0 is an inverter that inverts the output signal of the first judgment device 15, and sends its output to the R-S. flip flop 29
This is the reset input.

Furthermore, the first relay 31 is connected to the output Q of the flip-flop 29.
Connect.

31B is a self-holding contact of the first relay 31, 32 is a normally closed manual reset switch, 31a is a normally closed contact of the first relay 31, and 33 connected via the contact 31a is a predetermined lowering temperature of the evaporation temperature. 34 is a second relay, 34B is a thermostat for terminating ice making that detects the
35 is a self-holding contact of the second relay 34; 35 is a dehydration termination thermostat that detects a predetermined temperature increase of the ice-making member 3 that is raised by circulating hot gas in the refrigeration system and terminates the dehydration operation; 34a is a second The circulation pump 7 and the fan 13 are connected through the normally closed contact of the relay 34.

34b is a normally open contact of the second relay 34, which connects the hot gas valve 36 and the water supply valve 4.

37 is a forced water supply switch, and 11 is the electric compressor.

On the other hand, 31b is a normally open contact of the first relay 31, and the contact 3
A water cutoff alarm lamp 3 is installed on the secondary side of the transformer 38 via 1b.
9 is connected.

Next, the operation of the present invention will be explained from the start of ice making.

First, the timer circuit 22 is in a reset state since the output signal of the first determination circuit 15 is input to the reset terminal 26.

On the other hand, the reset input terminal of the flip-flop 29 has a first
Since the output signal "0" of the determination circuit 15 is inputted via the inverter 30, "0" is outputted to the output terminal of the flip-flop 29.

Therefore, the first relay 31 is de-energized, its contact is located at the normally closed contact 31a, and the electric compressor 11 operates, and since the ice-making termination thermostat 33 is open at this time, the second relay 34 is de-energized. Upon excitation, the circulation pump 7 and fan 13 operate via the normally closed contact 34a to start ice-making operation.

When the temperature detection device 14 detects the first temperature drop of the ice making member 3, the first determination circuit 15 generates an output signal °°1''.

Then, the reset of the counter circuit 23 is released, and the counter circuit 23 starts clocking to run 1 of the clock.

On the other hand, the reset input terminal of the flip-flop 29 is “
0゛ is input, but since the input signal of the set input terminal does not change to ``°0'', the flip-flop state ``0'' output is maintained and the first relay 3] continues to be de-energized and the ice making operation continues. continue.

When a time-up signal is generated from the comparator 24 of the timer circuit 22, the one-shot multivibrator 27 instantaneously generates a pulse output.

If this pulse output and the second determination circuit 18 cannot be ANDed, that is, the temperature detection device 14
In a state where the temperature drop is not detected, “°0” continues to be input to the set input terminal of the flip-flop 29.

On the other hand, the reset input terminal of the flip-flop 29 is
“0゛ is input, so it is a flip-flop.

29 continues to maintain the previous state of "0", the first relay 31 continues to be de-energized, and the ice-making operation continues.

Furthermore, after the time-up signal is generated, the temperature detection device 14
Even if the output signal 41 1 41 is generated from the second determination circuit 18 by detecting a decrease in the temperature of The output of the flip-flop 29 does not change to 0, and the ice-making operation does not stop.

When the ice-making termination thermostat I.33 finally closes the contact, the second relay 34 is energized and the contact is switched from the normally closed contact 34a to the normally open contact 34b, and the circulation pump 7
Then, the operation of the fan 13 is stopped to end the ice-making operation, and the condenser I/gas valve 36 and water supply valve 4 are operated, and the condenser 12 is bypassed from the electric compressor 11 which continues to operate, and the condenser 12 is bypassed and the condenser 12 of the refrigeration system is supplied to the evaporation pipe 2. I. gas is supplied to start dehydration of the ice sheets frozen in the ice making member 3, and at the same time water for ice making for the next cycle is supplied to the water storage tank.

When the dehydration operation is started, the temperature of the ice-making member 3 rises, and the ice sheet finally separates from the ice-making member 3 and falls onto the ice-sheet cutting heater device 9.

When the dehydration termination thermostat 35 detects the increased temperature of the ice making member 3 at this time, the contact is opened to de-energize the second relay 34, and the contact is switched from the normally open contact 34b to the normally closed contact 34a again. Start ice-making operation of the cycle.

Note that as the temperature of the ice making member 3 rises due to the dehydration operation, the output of the second judgment circuit 18 and then the first judgment circuit 15 changes from "1" to "0", but the output of the flip-flop 29 changes from "1" to "0".
The output signal °゛0゛ remains unchanged.

Then, when the output of the first determination circuit 15 changes to 410+1, the timer circuit 22 is reset to prepare for the next cycle.

The above describes the normal -cycle circuit operation without water cutoff.

That is, when water is being supplied normally to the water storage tank 6, the ice-making water in the water storage tank 6 is circulated to the ice-making member 3 during the ice-making operation, and heat exchange between this water and the ice-making member 3 is performed. The temperature drop gradient of the ice making member 3 is as shown by A in Figure 3, and since the temperature of the ice making member 3 has not reached the second drop temperature when the time-up signal occurs, the water supply operation is normal in this cycle. It is determined that this has been carried out, and one cycle of ice making operation and dehydration operation is completed as described above.

However, in the case of a water outage where normal water supply operation is not performed to the water storage tank 6, water is not circulated to the ice making member 3 during the ice making operation, so the gradient of the temperature drop of the ice making member 3 is 3.
The slope becomes steep as shown by B in the figure.

The operation in case of water outage will be explained below.

As described above, when the ice making operation is started and the temperature detection device 14 detects the first decreased temperature of the ice making member 3, the first determination circuit 1
5 is a counter circuit 2 to generate an output signal °"1".
3 starts counting the tarokku.

At this time, the output of the fluff 0 fluff 029 is maintained at 0.0'' as if it were overheated, so it is the first.

The ice making operation continues with the relay 31 de-energized.

Therefore, the temperature of the ice making member 3 continues to drop rapidly.

When a time-up signal is generated from the timer circuit 22, the one-shot multivibrator 27 inputs an instantaneous pulse output to the second AND circuit 28 in response to this signal.

At this time, if the temperature detection device 14 detects the second decreased temperature of the ice making member 3, the second determination circuit 18 outputs an output signal "1".
" is generated and this is ANDed with the pulse output, and 1" is inputted to the cellar 1 to input terminals of the flip-flop 29.

At this time, since 0'' is input to the reset input terminal of the flip-flop 29, the flip-flop 4i 1 n is generated.

Therefore, the first reloo 31 is energized and its contacts are switched from the normally closed contact 31a to the normally open contact 31b, making the electric compressor 11, circulation pump 7 and fan 13 inoperable, stopping the ice making operation and protecting the machine. At the same time, power is supplied to the secondary side of the transformer 38 to turn on the water outage notification lamp 39 to notify that there is a water outage.

Note that since the temperature of the ice-making member 3 naturally rises due to the stoppage of the ice-making operation, the output of the second judgment circuit 18 and then the first judgment circuit 15 changes from °1' to °'0', causing the flip-flop 29 to change. Although the first relay 31 is reset, the first relay 31 continues to be energized via its self-holding contact 31B, so the operation will not be resumed in a water cutoff state.

When the water cutoff is canceled, first press the forced water supply switch 37 to supply water to the water storage tank 6, and then release the excitation of the first relay 31 using the reset switch 32 to restart the ice making operation.

In addition, in the embodiment, the temperature detection device 14 is connected to the ice making member 3.
Although the temperature of the evaporation pipe 2 or the suction side piping 2a can be detected by changing each set temperature, water cutoff can also be determined.

As described above, the present invention provides a second method in which the temperature of the ice making member is lower than the first reduced temperature when a predetermined period of time has elapsed since the start of the ice making operation and the temperature of the ice making member reached the first reduced temperature. This ice maker's water outage detection method determines that the water is out when the temperature is below the drop temperature of the ice maker. - Since this is done every cycle, it is possible to quickly determine whether the water is normal or if there is a water outage.

Furthermore, it has the extremely remarkable advantage that it can be widely applied to various types of ice making machines that freeze ice by circulating ice making water through the ice making member.

Furthermore, since the present invention stops the ice making operation based on the water cutoff signal, the ice making machine can be safely protected, and since the water cutoff warning lamp lights up, the user can confirm that the operation has stopped due to the water cutoff. It has the advantage of being able to

[Brief explanation of drawings]

FIG. 1 is a sectional view of the main parts of an ice making machine that can implement the present invention, FIG. 2 is an electric circuit diagram, and FIGS. 3 A and B are diagrams showing the relationship between temperature changes in ice making members over time during normal conditions and during water outages. .

Claims (1)

[Claims] 1. In an ice-making machine that circulates ice-making water supplied into a tank to an ice-making member equipped with a refrigeration system between the end of an ice-making operation and the start of the next ice-making operation, the ice-making operation is started and the ice-making operation described above is performed. When a predetermined period of time has elapsed since the temperature of the ice-making member or the suction-side piping reached the first reduced temperature, the temperature of the ice-making member or the suction-side piping decreases to the first lower temperature.
A method for detecting a water outage in an ice maker, characterized in that a water outage is determined when the temperature is lower than a second temperature drop, which is lower than a second temperature drop.