JPS6248276B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a hot water supply control device for a vending machine that sells hot coffee, for example.

(Prior Art) A vending machine that sells hot coffee in cups houses a hot water tank, and the water in the hot water tank is heated by a heating element to supply a fixed amount at the time of sale. The capacity of hot water tanks used in such devices is determined to cover a certain amount of sales, and for this reason, one heating element is insufficient, so two heating elements are usually provided, one above the other. For example, Jitsugyo
There are techniques shown in Japanese Unexamined Patent Publication No. 50-152796 and Japanese Utility Model Application Publication No. 150400/1983. In the former, a first heating device is provided in the upper tank, a second heating device is provided in the lower tank, and a through hole is formed in the partition wall that separates the upper tank and the lower tank. Therefore,
Although it is possible to extremely reduce the temperature drop of the hot water in the upper tank, it is conceivable to energize the first and second heating devices at the same time, and it is necessary to increase the amount of power supplied. On the other hand, the latter is divided into a first tank and a second tank, each of which is provided with an electric heater separately, and the first tank is equipped with an electric heater only for one of the tanks and has a hot water outlet. The electric heater in the tank is energized preferentially. Therefore, the amount of power supplied becomes smaller.

By the way, when hot coffee is sold in a vending machine, hot coffee includes, for example, instant coffee and fresh coffee. For instant coffee, it is sufficient to supply hot water at around 85°C, but for fresh coffee, the coffee is obtained by extraction, so water at a temperature close to the boiling point is required.

However, in each of the above techniques, the temperature of hot water in a tank provided with a hot water outlet is controlled to a predetermined value by controlling the supply of electricity to an electric heater, and then the hot water is discharged. Therefore, although it is possible to obtain the optimum water temperature for either instant coffee or fresh coffee, it is not possible to obtain the optimum water temperature for both at the same time.

(Problems to be Solved by the Invention) As described above, it is not possible to obtain a different optimal water temperature for each hot coffee, for example.

SUMMARY OF THE INVENTION An object of the present invention is to provide a hot water supply control device for a vending machine that can obtain different optimum water temperatures for each vending product with a small amount of power supplied.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a first heating element and a first heating element provided at the upper and lower parts of a hot water tank having a water inlet at the lower part and a hot water outlet at the upper part. 2 heating elements, and a 1st heating element.
A first heating element control thermometer that detects the water temperature near the heating element and turns off when it reaches a preset temperature; and a first heating element control thermometer that is installed near the water outlet and turns off when the water temperature reaches a preset temperature, which is lower than the boiling point. A second heating element control thermometer that detects the water temperature near the second heating element and turns it off when the water temperature reaches the boiling point, which is the second sales temperature, and a start switch. a first relay that is activated and self-maintained via a first heating element control thermostat and its own normally closed contact; and a second heating element having a switching contact connected to the first and second heating elements; a second relay that is energized and controlled via the body control thermostat and the normally closed contact of the first relay; and a third relay that has a switching contact that is connected to the first sales mechanism and is energized and controlled via the appropriate temperature thermostat. The above objective is achieved by providing a relay having a switching contact connected to the second sales mechanism and controlled to be energized via the switching contact of the second heating element control thermometer and the third relay. This is a hot water supply control device for vending machines.

(Function) By providing such means, the first heating element keeps the first heating element control thermostat and the second relay normally closed until the water temperature near the heating element at the bottom of the hot water tank reaches the set temperature. When the water temperature exceeds the set temperature, the second relay is activated and the second heating element is energized through the second heating element control thermo and the normally open contact of the second relay. . When the water temperature rises and reaches the first sales temperature, the appropriate temperature thermostat is turned on, the third relay responds to this, energizes the first sales mechanism, and the water temperature reaches the second sales temperature. When this temperature is reached, the second vending mechanism is energized in response to the second heating element control thermostat.

(Example) Figures 1 to 3 show examples of the present invention, and 1 is a closed type with a water supply port 2 provided on the lower side and two outlet ports 3 and 4 provided on the upper side. hot water tank. The interior of the hot water tank 1 is partitioned into two layers, upper and lower, by providing a partition plate 5 with a plurality of small holes above both the drain ports 3 and 4. A first heating element 6 is provided to protrude from the inside of the bottom of the hot water tank 1, and a second heating element 7 is provided to protrude from the inside of the top. A cistern 8 for adjusting the amount of water in the hot water tank 1 is provided at the upper side of the hot water tank 1, and a pipe 9 communicates the bottom of the cistern 8 with the water supply port 2 of the hot water tank 1. There is a water supply port 1 on the upper side of the cistern 8.
0 is provided, and this water supply port 10 communicates with a water supply 12 via a solenoid valve 11. A float 13 is floated in the cistern 8, and when the water level inside reaches a predetermined water level, a float switch 14 is operated to close the electromagnetic valve 11. A first heating element control thermostat 15 is provided on the side of the first heating element 6. A pipe 16 for releasing steam is provided at the top of the hot water tank 1.
6 communicates with the outside air via a heat exchanger 17.
A second heating element control thermostat 18 is provided near the pipe 16 in the heat exchanger 17.
The one outlet 3 communicates with the auxiliary tank 0 via the solenoid valve 19, and the other outlet 4 communicates with the solenoid valve 2.
1 to an instant coffee vending mechanism (not shown) as a first vending mechanism.
The bottom of the auxiliary tank 20 is connected to a pump 23 driven by a motor 22, and the pump 23 is connected to a pipe 24, a booster coil 25 that is wound around the second heating element 7 and constitutes a heat exchanger, and a pipe. It communicates with a fresh coffee extraction section 27 via 26. A resale prevention thermostat 28 is installed on the outside of the side surface of the upper part of the hot water tank 1 that is partitioned by the partition plate 5.
An appropriate temperature thermostat 29 is provided on the outside of the side surface located below the drain port 4 in the lower layer. A float switch 30 is provided in the auxiliary tank 20 to determine the water level so that the tank 20 always contains a certain amount of water.

FIG. 2 is a circuit diagram of a main part, in which a first relay 33 is connected to an AC power supply 31 via the first heating element control thermostat 15 and an automatic reset type start switch 32 in series, and a first relay 33 is connected via the appropriate temperature thermostat 29. A third relay 34 is connected thereto. The first switch in the first relay 33 is connected to the start switch 32.
The normally open sides of the switching contacts 331 are connected in parallel. Further, a fourth relay 3 is connected to the AC power supply 31 through the resale prevention thermostat 28 and the normally closed side of the second switching contact 332 of the first relay 33 in series.
5 is connected, and a fifth relay 36 is connected via the second heating element control thermostat 18 and the normally closed side of the second switching contact 342 of the third relay 34 in series. The normally open side of the first switching contact 361 of the fifth relay 36 is connected in parallel to the normally closed side of the second switching contact 342 of the third relay 34 . In addition, the AC power source 31
the second heating element control thermostat 18, the normally open side of the second switching contact 342 in the third relay 34, and the third switching contact 33 in the first relay 33.
A second relay 37 is connected in series through the normally closed side of No. 3. Furthermore, the AC power source 31 is connected to the first
The heating element control thermo 15, the first heating element temperature overrise prevention thermo 38, the normally closed side of the switching contact 371 in the second relay 37, the normally closed side of the switching contact 351 in the fourth relay 35, and the dry heating prevention thermo 3
9 in series, and the second heating element control thermostat 18, the second heating element temperature overrise prevention thermostat 40, and the switching contact 371 of the second relay 37. The second heating element 7 is connected through the normally open side, the normally closed side of the switching contact 351 of the fourth relay 35, and the dry heating prevention thermostat 39 in series. Then, power is supplied to the instant coffee vending mechanism through the normally open side of the first switching contact 341 in the fourth relay 34, and power is supplied through the normally closed side of the second switching contact 362 in the fifth relay 36. power is supplied to a fresh coffee sales mechanism (not shown) as a second sales mechanism. The instant coffee vending mechanism opens the solenoid valve 21 for a predetermined period of time to discharge a predetermined amount of hot water and sell instant coffee when a predetermined amount of coins and a selection switch are inserted while the power is supplied. Instant coffee is sold in cups by releasing powder, sugar, and cream. In addition, when the fresh coffee sales mechanism inserts a predetermined amount of coins and a selection switch while the power is being supplied, the solenoid valve 1
9 is opened for a certain period of time, the motor 22 is operated for a certain period of time, and coffee powder is supplied to the fresh coffee extracting section 27 to obtain a coffee extract, and sugar and cream are released into the coffee extract to produce fresh coffee. Sell cups.

The first heating element control thermostat 15 has a temperature of 90°C, for example.
It turns on when below, turns off when it exceeds 90℃, and the second
The heating element control thermo 18 turns on at temperatures below 60°C, for example, and turns off when the second sales temperature exceeds 100°C, and the resale prevention thermo 28 turns on at temperatures below 63°C, and turns off when it exceeds 63°C. In addition, the appropriate temperature thermostat 29 is set to turn off at temperatures below 85°C, which is the first sales temperature, and to turn on when the temperature exceeds 85°C.

Next, the operation of the embodiment of the present invention constructed as described above will be described based on FIG.

The current time when the water temperature in hot water tank 1 is 30℃
When the start switch 32 is pressed at t ₀ ,
Since the first heating element control thermostat 15 is on, the first relay 33 operates. From then on, the first relay 33 switches on its own first relay until the control thermostat 15 turns off.
is self-retained via the normally open side of the switching contact 331. The operation of the fourth relay 35 is stopped by the operation of the first relay 33. Electricity is then started to be applied to the first heating element 6, and the water in the hot water tank 1 is heated. Then, at time t ₁ , the water temperature in hot water tank 1 becomes
When the temperature exceeds 63℃, the resale prevention thermometer 28 turns off.
Further, at time _t2 , when the water temperature in the hot water tank 1 exceeds 85℃, the appropriate temperature thermostat 29 turns on, and the third relay 3
4 works. As a result, power supply to the instant coffee selling mechanism is started via the normally open side of the first switching contact 341 in the third relay 34, and instant coffee can be sold. Further, even if the normally open side of the second switching contact 342 is closed due to the operation of the third relay 34, since the first relay 33 is operating, the second relay 37
No energizing path is formed. Further, at time _t3 , when the water temperature in the hot water tank 1 exceeds 90°C, the first heating element control thermometer 15 is turned off, thereby stopping the power supply to the first heating element 6. Further, since the operation of the first relay 33 is stopped by turning off the first heating element control thermostat 15, the second Relay 37 is operated and its switching contact 371
is switched. This time, however, energization of the second heating element 7 is started. As a result, the water temperature in the upper layer of the hot water tank 1 rises rapidly and reaches the boiling point of 100° C. at time _t4 . Therefore, the steam in the hot water tank 1 escapes to the outside via the pipe 16, and the heat exchanger 1
It is cooled down at 7. As a result, the detected temperature of the second heating element control thermostat 18 exceeds 100° C. and is turned off. In this way, the power supply to the second heating element 7 is stopped. Further, the self-holding of the fifth relay 36 is released, and the fresh coffee vending mechanism can thereafter operate. Thereafter, the water temperature in the upper layer of the hot water tank 1 decreases, and when no steam is released, the second heating element control thermometer 18 is turned on again and the second heating element 7 is operated again. In this way, the operation of the second heating element 7 is repeated intermittently, so that the water temperature in the upper layer of the hot water tank 1 increases from 98°C to 98°C as shown in graph ○A in Fig. 3.
Maintained at 100℃. On the other hand, the water temperature in the lower part of the hot water tank 1 is maintained at a little less than 90° C., as shown in the graph ○ in FIG. 3, only slightly due to the influence of the second heating element 7. After that, from time t ₅ , coffee sales are carried out continuously and the hot water in the hot water tank 1 is discharged, and water is supplied from the cistern 8 to the water inlet 2 of the hot water tank 1 via the pipe 9. The temperature of the lower layer of 1 decreases. Then, at time t ₆ , when the temperature falls below 85°C, the appropriate temperature thermometer 29 is turned off, the operation of the third relay 34 is stopped, the sale of instant coffee is stopped, and the second heating element control thermometer 18 is activated. Power supply to the second heating element 7 is stopped regardless. Further, when the temperature detected by the second heating element control thermometer 18 becomes 60° C. or lower, the fifth relay 36 is activated and the sale of fresh coffee is stopped. In this way, the second relay 37 and the fourth relay 35 become inactive, so that energization of the first heating element 6 is started. When the water supply from the water supply port 2 is finished, the water in the lower layer of the hot water tank 1 starts rising again. Then, at time _t7 , when the water temperature in the lower layer exceeds 85°C, the appropriate temperature thermostat 29 is turned on again, and this causes the second relay 3
7 is turned on, the power supply to the heating element is switched from the first heating element 6 to the second heating element 7, and the temperature of the upper layer of the hot water tank 1 rises to the boiling point again.
After the water temperature in the upper layer reaches the boiling point, the same operations as those from time _t4 to _t5 described above will be performed. Thereafter, when the AC power supply 31 is cut off at time _t8 , no current is applied to the two heating elements 6 and 7, so the water temperature in the hot water tank 1 gradually decreases.
Then, at time _t9 , when the water temperature in the upper layer of the hot water tank 1 drops to 63° C. or lower, the resale prevention thermometer 28 is turned on. However, even if the power supply 31 is turned on again from now on, the fourth relay 35 operates and the energization path to both heating elements 6 and 7 is cut off, so the selling operation will be resumed unless the start switch 32 is operated again. You won't be hit.

In this way, in the above embodiment, the appropriate temperature thermometer detects the temperature of the water that is energized to the instant coffee vending mechanism, and the second heating element control thermometer is used to detect the temperature of the water that is energized to the fresh coffee vending mechanism. The optimum water temperature for instant coffee is 85°C or higher, and for fresh coffee it is close to the boiling point.

Furthermore, even if the first and second heating elements 6 and 7 are provided at the lower and upper parts of the hot water tank 1, the two heating elements do not perform the heating operation at the same time, and only one of them is always on, so the amount of power supplied is It is possible to use a power source with a small supply amount of power as long as the amount corresponds to one heating element. Further, the temperature of each hot water used for instant coffee and fresh coffee can be changed, and in particular, the hot water for fresh coffee can be brought to a temperature close to the boiling point by the booster coil 25. That is, it is possible to supply sufficiently heated hot water at an optimum temperature to the fresh coffee extracting section 27, and also to supply instant coffee with hot water at an optimum temperature.

[Effects of the Invention] As detailed above, the present invention provides a hot water supply control device for a vending machine that can obtain a different optimum water temperature for each vending product with a small amount of power supplied. can.

[Brief explanation of the drawing]

1 and 2 are configuration diagrams showing an embodiment of a hot water supply control device for a vending machine according to the present invention, in which FIG. 1 is a configuration diagram of a water temperature tank, FIG. 2 is a main circuit diagram, FIG. 3 is a diagram showing changes in water temperature in the hot water tank. 1... Hot water tank, 2... Water supply port, 3, 4...
Exhaust port, 6...first heating element, 7...second heating element, 15...first heating element control thermostat, 18...
...Second heating element control thermostat, 19...Solenoid valve, 2
7...Fresh coffee extraction section, 31...AC power supply, 32...Start switch, 33...First
relay, 37... second relay.

Claims (1)

[Claims] 1. Detecting a first heating element and a second heating element provided at the upper and lower parts of a hot water tank having a water supply port at the bottom and a hot water outlet at the top, respectively, and the water temperature near the first heating element. a first heating element control thermostat that is turned off when the temperature reaches a preset temperature, and an appropriate temperature thermometer that is installed near the outlet and that is turned on when the first sales temperature that is lower than the boiling point is reached; a second heating element control thermostat that detects the water temperature near the second heating element and turns off when the water temperature reaches a boiling point, which is a second sales temperature; a heating element control thermostat; a first relay self-held via its own normally closed contact; and a switching contact connected to the first and second heating elements, the second heating element control thermostat; a second relay that is energized and controlled via the normally closed contact of the first relay; and a third relay that has a switching contact that is connected to the first sales mechanism and that is energized and controlled via the appropriate temperature thermostat. and a relay that has a switching contact connected to a second sales mechanism and is energized and controlled via the switching contacts of the second heating element control thermometer and the third relay. Hot water supply control device for vending machines.