JPS6233155B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a liquid supply device in which pressurized water from a pump is piped to be branched and introduced into a water tank and a supply valve via a solenoid valve. To provide a device that can control the drive of a pump to distinguish between temporary stop and permanent stop depending on the cause of the abnormality.

Figure 1 shows a carbonated beverage supply device, 11
1 is a water supply pipe, 1 is a rotary pump that pressurizes water connected to the water supply pipe 11, and 3 is a carbonator that introduces water through a solenoid valve 2, a flow rate regulator 12, and a check valve 13, and at the same time supplies carbon dioxide gas in a carbon dioxide gas cylinder 14. is introduced through the pressure regulating pulp 15. 4A and 4B are a weakly carbonated beverage supply valve and a strongly carbonated beverage supply valve, respectively, for supplying carbonated beverages with different carbonic acid contents. Carbonated water in the carbonator 3 is introduced into the strongly carbonated beverage supply valve 4B through a conduit 16, and syrup of type A is also introduced through a conduit 17, and the syrup and carbonated water are mixed and poured out. In addition, the weakly carbonated beverage supply valve 4A has a check valve 1.
8, dilution water is introduced through a conduit 19, class B syrup is introduced through a conduit 20, and carbonated water is introduced through a check valve 21 and a conduit 22, and the syrup, carbonated water, and dilution water are mixed and poured out. Supply valves 4A and 4B
is opened by pressing the supply levers 5A and 5B,
Further, in the case of the supply valve 4A, a reed switch (not shown) is configured to close the contact point in conjunction with the pressing operation.

Therefore, when the supply lever 4A is pressed to supply a weakly carbonated beverage, the contacts of the reed switch are closed, the pump 1 and the solenoid valve 2 are driven, and dilution water is introduced from the conduit 19 into the supply valve 4A.

Further, at this time, when comparing the pressures in the conduits 19 and 23, the pressure in the conduit 19 is low, and dilution water is not introduced into the conduit 23. When the water level of the carbonator 3 falls to the lower level, the pump 1 and the solenoid valve 2 are driven based on the output of the sensor 7C, and pressurized water is supplied to the carbonator 3 unless the supply valve 4A is in the open state, and the water level falls to the upper level. When the pump 1 and the solenoid valve 2 recover, based on the output of the sensor 7B,
stops and ends the supply operation.

In this way, the pressurized water from the pump 1 is branched to the supply valve 4A and the water tank 3 (carbonator in the above explanation) via the solenoid valve 2, and in conjunction with the pressing operation of the supply valve 4A, the contact point is closed during the pressing operation period. It is equipped with a closing switch device, and when the contact is closed, the pump 1 and the solenoid valve 2 are driven to introduce pressurized water into the supply valve 4A, and when the liquid in the water tank 3 is insufficient, the pump 1 and the solenoid valve 2 are activated by a detection signal from the sensor.
In a liquid supply device that drives pressurized water to introduce pressurized water into the water tank 3, an abnormality often occurs in which the water level in the water tank 3 reaches the highest dangerous level. At this time, in the conventional device, when the water level in the water tank 3 reaches a dangerous level by the sensor 7A, the function immediately stops. However, when considering the cause of this problem, there are two cases: a failure of the device, particularly the solenoid valve 2, and a difference in the timing at which the reed switch and the supply valve 4A end their operations. In the former case, the pressure of the tap water is high and the water is introduced even if the pump 1 is not operating, and if the solenoid valve 2 is out of order, the water may further flow into the water tank 3, resulting in an abnormality. However, in the latter case, the timing of closing the supply valve 4A by releasing the pressure on the operating lever 5A and the reed switch being turned ON.
There is a difference between the timing when the reed switch switches to OFF, and if the reed switch timing is long, pump 1 and solenoid valve 2
This is an abnormality that occurs when the machine operates for a short period of time. In such a state, pressurized water is supplied to the water tank 3 as described above, that is, water is replenished regardless of the amount of water in the water tank 3 during this lag time. Depending on how the reed switch is installed or how quickly or quickly the pressure on the operating lever 5A is released, the maximum time lag can reach 4 seconds. The amount of water replenished during the lag time may be greater than the amount of water poured out at the time. Therefore, if such a situation is repeated, the water level may reach a dangerous level even though the equipment is not malfunctioning.
Therefore, even when the water level reaches a dangerous level due to such a cause, it would be extremely inefficient and inconvenient as a liquid supply device.

Based on the above points, the present invention, when the water level in the water tank reaches a dangerous level, determines whether the cause is due to a failure of the solenoid valve or the above-mentioned deviation, and temporarily or permanently stops the function. There is a distinction between

The present invention will be explained below using the carbonated beverage dispensing apparatus shown in FIG.

FIG. 2 explains the principle of the present invention. Reference numeral 6 is a reed switch that closes the contact in conjunction with the pressing operation of the supply valve 4A. When the reed switch 6 is turned on, the pulse generation circuit 24 generates an output pulse and the flip-flop circuit 8 is set. Furthermore, the reset terminal R of the flip-flop circuit 8 is connected to the timer circuit 2.
5, the timer circuit 25 outputs a reset signal when a predetermined time period longer than the time required to dispense at least one dose (approximately one cup) of liquid after the reed switch 6 is turned on has elapsed. There is. 26 is a detection circuit that determines whether the water level has reached a dangerous level based on the detected voltage between the sensor 7A and the common sensor 7D, and outputs a high level output when the water level is at the dangerous level. Flip-flop circuit 8
is connected to the Q output terminal of. On the other hand, the AND gate 28 includes the detection circuit 26 and the flip-flop circuit 8.
The flip-flop circuit 33 is set at the output of the AND gate 28.
And 29 is sensor 7C and common sensor 7D
The flip-flop circuit 30 is set by the output of the AND gate 27, and the flip-flop circuit 30 is set by the output of the AND gate 27, and the detection circuit 30 is set by the output of the AND gate 27. Reset on output. The relay 31 constitutes a temporary stop control device 9 together with the flip-flop circuit 30.
is connected to the Q output terminal of the amplifier via an amplification circuit 32. On the other hand, the relay 34 is a flip-flop circuit 33
Together with the stop control device 10 , it is connected to the Q output terminal of the flip-flop circuit 33 via an amplification circuit 35. Also, contacts 36 and 37 of relays 31 and 34 are connected to pump motor 1 and solenoid valve 2, respectively.
are connected in series to a parallel circuit. The pump motor 1 and the solenoid valve 2 are energized and driven by the terminals L ₁ L ₂ while the reed switch 6 is on or when the water level is at a lower level with the contacts 36 and 37 closed. When the water level is at a lower level and the device is driven, the current is cut off when the water level returns to the upper level, but this energizing circuit is not directly related to the present invention and will therefore be omitted. Further, 38 and 39 are display devices indicating that the pump 1 is in a temporary stop state or a stopped state.

With this configuration, when the supply lever 5A is pressed and the reed switch 6 is turned on, an output pulse is generated from the pulse generation circuit 24, and the flip-flop circuit 8 memorizes that a dispensing operation has been performed from the supply valve 4A. In addition, since the timer circuit 25 outputs a reset signal at predetermined time intervals longer than the time required to dispense one dose of liquid, the flip-flop circuit 8, which is set based on the operation of the supply lever 5A, outputs a reset signal when the liquid for one dose is dispensed from the supply valve 4A. Even after being released, it remains in memory for a while. When the water level in the water tank 3 reaches a dangerous level, a high level signal is output from the detection circuit 26 based on the detected voltage between the sensor 7A and the common sensor 7D. At this time, if the flip-flop circuit 8 is in the memory state,
An output is obtained at the AND gate 27, the flip-flop circuit 30 is set, the relay 31 is energized, and the contact 36 is opened, thereby cutting off the energizing path of the pump 1 and the solenoid valve 2. This is immediately after the liquid is poured out, and the supply valve 4
This is a measure to be taken when the reed switch 6 is turned OFF later than the closing timing of A, pressurized water is abnormally supplied to the water tank 3, and the water level reaches a dangerous level. Therefore, the driving of the pump 1 and the solenoid valve 2 is prohibited from now on by opening the contact point 36, and pressurized water is not introduced into the conduit 19 even if the supply lever 5A is pressed, and only syrup B and carbonated water are injected from the supply valve 4A. Served. When the water level in the water tank 3 reaches a lower level after several times of pouring, a high level signal is output from the detection circuit 29 based on the detection voltage between the sensor 7C and the common sensor 7D, and the flip-flop circuit 30 is reset. When the relay 31 is demagnetized, the drive prohibition state of the pump 1 and the solenoid valve 2 is canceled by closing the contact 36, and the pump 1 and the solenoid valve 2 are driven until the water level reaches the upper level.

Thereafter, when the supply lever 5A is pressed, the pump 1 and the solenoid valve 2 are driven, and dilution water, syrup B, and carbonated water are normally poured out from the supply valve 4A.

In this way, when the flip-flop circuit 30 is set, it controls the temporary stopping of the pump 1 and the solenoid valve 2 until the water level reaches the lower level, and this situation is displayed on the display device 38.

Furthermore, if the water level in the water tank 3 reaches a dangerous level and a high-level signal is generated from the detection circuit 26 before it has been immediately poured out from the supply valve 4A, the flip-flop circuit 8 has been reset, so the AND gate 2
An output is obtained at 8, the flip-flop circuit 33 is set, the relay 34 is energized, and the contact 37 is opened, cutting off the energizing path of the pump 1 and the solenoid valve 2. This is a measure to be taken when the tap water pressure is high and the electromagnetic valve 2 is out of order, causing water to be abnormally supplied to the water tank 3 and reaching a dangerous water level. The flip-flop circuit 33 will not be reset unless the equipment administrator notices this accident and operates the predetermined maintenance switch 40, and the pump 1 and solenoid valve 2 will be reset.
The drive prohibited state is maintained permanently, and the display device 39 displays that dispensing is not possible.

FIG. 3 shows a case where the present invention is implemented under the control of a microcomputer 41. The output port A of the microcomputer 41 is connected to three sensors 7A, 7B, and 7C through an amplification circuit 42, and the output port B is connected to a common sensor 7D through an amplification circuit 43. Outputs a high level signal to output port A and a low level signal to output port B. Also, the microcomputer 41 uses 4 bits from the output port C ₀ C ₁ C ₂ C _3.
16 types of digital information are output sequentially and any sensor 7A, 7B, 7C and common sensor 7
By determining the detection voltage generated between D, it is determined whether the water level has reached the sensor. That is, the D/A conversion circuit 44 outputs 16 analog reference voltages based on the digital information that is sequentially input.
Comparators 45, 46, and 47 corresponding to the sensors 7A, 7B, and 7C compare the detected voltage and the reference voltage, and when they match, introduce a matching signal to the input ports _D0 , _D1, and _D2 of the microcomputer 41. is configured to do so. Therefore, the microcomputer 41 determines whether the water level has reached the sensor based on the bit pattern output from the output port C ₀ C ₁ C ₂ C ₃ at the time when the coincidence signal is input. Furthermore, the interrupt terminal INT of the microcomputer 41 is connected to the reed switch 6.
The reed switch 6 is pressed by the supply lever 5A.
When it is turned on, an interrupt occurs, interrupting the program that has been running up to that point, and storing the fact that the dispensing operation has started in memory. Then, the microcomputer 41 outputs a control signal from the output port E when the water level falls to a lower level or when an interrupt occurs due to ON of the reed switch 6, and excites the relay 49 via the current amplification circuit 48. to drive the pump 1 and the solenoid valve 2. When the water level is at a lower level and the pump 1 and solenoid valve 2 are driven, the microcomputer 41 outputs a high level signal to the output port A and a low level signal to the output port B, and also outputs the above 16 types of signals. Repeatedly output digital information. Then, at which digital information is output, the detected voltage is determined based on whether the matching signal is input from the comparator 45 to the input port _D2 , and it is determined whether the water level has reached the upper level, and the water level has reached the upper level. In this case, the relay 49 is demagnetized.

Although FIG. 4 is a flowchart showing the above control by the microcomputer 41, only the abnormality detection flow of the electromagnetic valve according to the present invention is shown.
First, the microcomputer 41 outputs a high-level signal to the output port A and a low-level signal to the output port B, and also outputs a 16-level signal to the A/D conversion circuit 44.
Street digital information output to input port D ₂
It is determined whether the water level has reached a dangerous level based on the input of a matching signal. When the dangerous level has been reached, it is confirmed that a dispensing operation occurred immediately before by using the memory that stores the fact that the reed switch 6 was turned on due to an interrupt. If the danger level has not been reached, this memory is set and the process moves to the main flow. If there is a pouring operation, the memory is reset due to the above-mentioned timing difference, and the process moves to the main flow on the condition that the excitation of the relay 49 is temporarily prohibited until the water level reaches the lower level. Therefore, when it is detected that the water level has reached a lower level during operation of the main flow, the prohibited state of excitation of the relay 49 is canceled and the pump 1 and the electromagnetic valve 2 are enabled to operate as appropriate.

However, if the dispensing operation is not confirmed from the memory, the flow will stop due to a failure of the solenoid valve 2, the relay 49 will not be energized, and the pump 1
And solenoid valve 2 is not driven. In this case, after repairing the electromagnetic valve 2 to reduce the water level to at least a dangerous level, the normal state can be restored by turning the power back on.
In addition, while the control flow and main flow are repeated, the memory is constantly reset, and furthermore, if an interrupt occurs and a dispensing operation is started, the program is interrupted and restarted when the dispensing is completed, so the memory is When an operation occurs, it remains in memory for a longer time than the pouring time, and the timer function explained in FIG. 2 is performed by the program.

According to the present invention described in detail above, when the liquid supply device detects that the water level in the water tank reaches a dangerous level, the cause of this abnormality is clarified by checking whether or not a pouring operation occurred immediately before the detection. It is something to do.

If the abnormality is not due to a failure of the solenoid valve, the operation of the pump will be stopped as an operational inconvenience until the water level falls to a lower level, but the pump will still be able to continue dispensing. However, if the abnormality is due to a failure of the electromagnetic valve, the pump is prohibited from being driven regardless of the water level, and the abnormality is displayed on the display. Therefore, there is provided a liquid supply device that is equipped with a self-diagnosis function and is easy to manage because it automatically restores the function if the abnormality is not caused by a failure.

[Brief explanation of the drawing]

FIG. 1 shows a piping diagram of a carbonated beverage supply device, FIG. 2 shows a control circuit according to the present invention, FIG. 3 shows a control circuit using a microcomputer, and FIG. 4 shows a flowchart in the case of program control. 1... Pump, 2... Solenoid valve, 3... Carbonator, 4A... Supply valve, 5A... Supply lever, 6
...Switch device, 7A...Sensor, 8...Storage device, 9 ...Pause control device, 10 ...Stop control device.

Claims (1)

[Claims] 1. In a liquid supply device configured with piping so that pressurized water from a pump is branched and introduced into a water tank and a water supply valve via a solenoid valve, when it is detected that the water level in the water tank has fallen to a lower level, the pump and the solenoid valve are a lower level sensor that generates a signal to drive a valve; and an upper level sensor that generates a signal to stop driving the pump and the solenoid valve when it detects that the water level in the aquarium rises to the upper level; a supply lever that opens the supply valve in conjunction with a pressing operation; a switch device that detects that the supply lever is pressed and generates a signal for driving the pump and the electromagnetic valve within a detection period; a dangerous level sensor for detecting when the water level in said aquarium rises to a dangerous level that is higher than said upper level; and said switch device is set based on the generation of a signal to dispense at least one supply of liquid. a storage device that is kept in the set state for a period longer than the period during which the supply lever is pressed and operated; and when the danger level sensor detects the danger level and the storage device is in the set state, the lower level sensor A temporary stop control device prohibits driving of the pump until a lower level is detected, and when the dangerous level sensor detects a dangerous level and the storage device is in a non-set state, the dangerous level sensor or the upper level sensor or the lower level sensor is activated. A liquid supply device comprising a stop control device that prohibits the pump from being driven thereafter regardless of any output of a level sensor.