JPS635046B2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention is directed to the control of a frozen dessert manufacturing apparatus that appropriately supplies mix into a freezing cylinder connected to a freezing system and takes out frozen desserts manufactured in the freezing cylinder. Regarding equipment.

(b) Conventional technology Publication of Utility Model Publication No. 58-35033 describes a soft-serve ice cream manufacturing machine equipped with a mix tank, a freezing cylinder, etc., which detects the condition of the soft-serve ice cream based on the temperature of the freezing cylinder and turns on/off the cooling operation. A soft serve ice cream making machine is shown that includes a first temperature sensing device that controls OFF.

(c) Problems to be Solved by the Invention In the above-mentioned conventional technology, the state of the soft-serve ice cream in the freezing cylinder is indirectly detected based on the temperature of the freezing cylinder by the first temperature sensing device;
Since ON/OFF of the cooling operation is controlled, when taking out the soft serve ice cream from the frozen cylinder, the temperature of the frozen cylinder increases due to the first temperature sensing device compared to the increase in the temperature of the soft serve ice cream inside the frozen cylinder due to the supply of mixes. Detection is delayed, and as a result, the start of the cooling operation is delayed, causing a temperature rise in the soft-serve ice cream inside the freezing cylinder, causing the problem that the soft-serve ice cream becomes soft and its quality deteriorates. It is an object of the present invention to solve the above-mentioned problems and to achieve uniform quality of frozen desserts such as soft serve ice cream.

(d) Means for Solving the Problems The present invention provides a frozen dessert in which mix is appropriately supplied into a freezing cylinder connected to a freezing system, and frozen desserts such as soft serve ice cream produced in the freezing cylinder are taken out to the outside. In the manufacturing apparatus, a detection device is attached to the refrigeration cylinder and includes a heat-sensitive element and a heating resistor that heats the element, and a control that controls the operation of the refrigeration system based on the temperature detected by the heat-sensitive element. and a timer circuit that energizes the heat generating resistor for a predetermined time when the frozen dessert is taken out from the freezing cylinder, and when the heat sensitive element is heated by the heat generated by the heat generating resistor and reaches a predetermined temperature, the control circuit The above-mentioned problem is solved by a control device for a frozen dessert manufacturing apparatus in which operation of the refrigeration system is started.

(E) Effect When taking out frozen desserts from the freezing cylinder, the heating resistor of the detection element is energized for a predetermined period of time by the operation of a timer circuit, and the detection device is heated by the heat generated by the heating resistor and its temperature rises. The heat-sensitive element detects this temperature, and the control circuit operates to start the operation of the refrigeration system.

(F) Embodiment Hereinafter, an embodiment of the present invention will be described in detail based on FIGS. 1 to 5.

In Fig. 3, 1 is a mix tank that stores so-called mix, which is a raw material for frozen desserts such as shakes and soft serve ice cream, and 2 is a freezing cylinder that is a chamber for producing the frozen desserts. , a condenser 4, and a pressure reducing device 5, and a cylinder cooling pipe (hereinafter referred to as cooling pipe) 7, which is an evaporation pipe, is wound around the cylinder. 8 is a detection device according to the present invention, 2A is a stirring device provided in the freezing cylinder 2, M is a driving electric motor (hereinafter referred to as a motor) for this stirring device, and the detection device 8 is designed to be unaffected by the evaporation temperature. It is attached to the surface of the freezing cylinder 2 at a distance from the cooling pipe 7 so as to detect the freezing state (temperature) based on the temperature of the freezing cylinder 2. The detection device 8 has a heat-sensitive element 9 such as a thermistor heated by a heating resistor 10, and in the embodiment, they are integrally molded so as to be embedded in a heat-conductive resin 8A such as epoxy. This is what I did. Furthermore, stirring device 2A
stirs the cooled mix in the freezing cylinder 2, and serves as a delivery mechanism when supplying frozen desserts. Further, reference numeral 11 denotes a frozen dessert removal device attached to the front of the freezing cylinder 2, and this frozen dessert removal device 11 includes a plunger 13A that connects and disconnects the inside of the freezing cylinder 2 and the supply port 12, and an automatic return type that operates this plunger. It consists of a take-out switch S, etc.

FIG. 1 is a schematic operating circuit diagram of the frozen dessert manufacturing apparatus, and 15, 16, and 17 are operational amplifiers (hereinafter referred to as amplifiers) connected between the DC power lines L ₁ and L ₂ of the control circuit C and forming a bridge circuit. , first, second
It is a comparator. Also, R ₁ and R ₂ are resistors, 18 is a variable resistor, and is connected to the negative input terminal of the amplifier 15 via resistor R ₃ , R ₄ and R ₅ are resistors, and 9 is a heat-sensitive element, which is connected to the negative input terminal of the amplifier 15. Connected to the positive input terminal, _R6 is a feedback resistor. Further, R ₇ to R ₉ are resistors, and the output terminal of the amplifier 15 is connected to the negative input terminal of the first comparator 16 and the positive input terminal of the second comparator 17 . 20, 21 more
are first and second transistors, and the power supply line L ₁ is connected to the collector of the second transistor 21 via resistors R ₁₀ , R ₁₁ , R ₁₂ and a diode 22 . Further, 23 is a diode provided with the direction of the output terminal of the first comparator 16 as the forward direction, and 24
is a diode whose forward direction is the direction of the output terminal of the second comparator 17. Furthermore, R ₁₃ and R ₁₄ are resistances,
RC ₁ is a first relay coil that is energized when the second transistor 21 is turned on.

Further, 25 is a switch circuit that operates when taking out frozen desserts, 26 is a power supply control circuit for the heating resistor 10, and the switch circuit 25 includes a take-out switch S connected to an AC power source 30, a diode 31, resistors R ₁₅ , R ₁₆ ,
Light emitting diode 32A, resistor R ₁₇ , capacitor C ₁
It is composed of etc. Further, the energization control circuit 26 includes a light receiving element 32B that is turned on by light emission from the light emitting diode 32A, a capacitor C ₂ , a first inverter circuit 34, a diode 35, and a first inverter circuit 3.
2nd and 3rd inverter circuits 3 inputting the output of 4.
6, 37, a third transistor 38 that is turned on and off based on the output of the third inverter circuit 37, a heating resistor 10 connected between the collector of the third transistor and the power supply line _L1 , and further
C ₃ is a capacitor, 40 is the third inverter circuit 3
6 is a variable resistor for adjusting the input potential, R ₂₀ to R ₂₅ are resistors, and R ₂₆ 38A is a resistor and a diode, respectively. Further, a second relay coil RC ₂ for controlling the motor M is connected in parallel with the heating resistor 10 .

Further, 40 is an operating circuit that controls power supply from the AC power source to the electric compressor 3 and motor M, RS ₁ is a first relay switch that is turned on by energization of the first relay coil RC, and RS ₂ is a circuit that controls power supply to the electric compressor 3 and motor M. This is a second relay switch that is turned on by energizing the second relay coil _RC2 connected in series with the second relay coil RC2. Further, a third relay switch RS ₃ is connected in parallel with the second relay switch RS ₂ and is turned on when the first relay coil RC ₁ is energized.

The operation of the frozen dessert manufacturing apparatus will be explained below.

When the electric compressor 3 has stopped operating and the heat-sensitive element 3 detects the rising temperature of the refrigeration cylinder 2 and the resistance value gradually decreases, the positive input voltage of the amplifier 15 increases and the output voltage also gradually rises. Therefore, the input voltages at the negative input terminal of the first comparator 16 and the positive input terminal of the second comparator 17 gradually increase. As shown in FIG. 5, when the temperature T detected by the heat-sensitive element 9 reaches the upper limit temperature T ₁ of the preset temperature, for example, when the frozen dessert is soft serve ice cream, it reaches -4.5°C.
The negative input terminal of the comparator 16 is higher than the positive input terminal, and the first comparator outputs a low signal instead of a high signal. Further, the potential of the plus side input terminal of the second comparator 17 becomes higher than that of the minus side input terminal, and this second comparator outputs a high level signal. Therefore, the base potential of the first transistor 20 becomes low, turning on the first transistor 20, and this turning on increases the base potential of the second transistor 21, turning on the second transistor 21 and turning the first relay coil RC _{1 on.} is energized, the first relay switch RS ₁ is turned on, the electric compressor 3 is energized, the operation of the refrigeration system is started, and the refrigerant circulates through the cooling pipe 6 to increase the temperature of the refrigeration cylinder 2 and the frozen dessert in this cylinder. gradually decreases. At this time, the third relay switch _RS3 is also turned on, the motor M starts operating, and the frozen dessert in the freezing cylinder 2 is stirred by the operation of the stirring device 2A.

Further, as the temperature of the freezing cylinder 2 gradually decreases, the resistance value of the heat-sensitive element 9 gradually increases, the positive input voltage of the amplifier 15 gradually decreases, and the output voltage also gradually decreases. When the temperature drops to a preset temperature, the first comparator 16 outputs a high level signal. As shown in FIG. 5, when the temperature further decreases and the temperature detected by the heat-sensitive element 9 reaches the lower limit temperature T ₂ of the set temperature, for example, as mentioned above, when the frozen dessert is soft serve ice cream, the second comparison is made. The potential of the positive input terminal of the comparator 17 becomes lower than the potential of the negative input terminal of the second comparator 1.
7 outputs a low level signal. Then, the base potential of the second transistor 21 becomes low, turning off the second transistor 21, and further, the base potential of the first transistor 20 becomes high, turning off the first transistor. Therefore, the first relay coil
RC ₁ is de-energized and the 1st and 3rd relay switches are turned off.
Both RS ₁ and RS ₃ are turned off, and both the electric compressor 3 and the motor M stop operating. Thereafter, in the same manner as the above operation, the heat-sensitive element 9 changes as the temperature of the freezing cylinder 2 changes.
The operation of the electric compressor 3 and the motor M is controlled based on the change in the resistance value, and the temperature of the frozen dessert in the freezing cylinder 2 is kept substantially constant. Incidentally, FIG. 5 is a time course diagram showing the relationship between the change in temperature T detected by the heat-sensitive element 9 and the operation of the electric compressor 3.

As described above, when the operation of the frozen dessert manufacturing apparatus is controlled and the first transistor 21 is turned off and the operation of the refrigeration system is stopped, when the take-out switch S is turned on when taking out the frozen dessert, the light emitting diode 32A
is lit and the light receiving element 32B is turned on. When the light receiving element 32B is turned on, the capacitor C ₂ starts charging, and due to the time constant of the resistor R ₂₁ and the capacitor C ₂ , the first inverter circuit 34 inputs a low level signal until its input rises to a predetermined level, and then goes high. Outputs level signal. Then, while the first inverter circuit 34 is outputting a high level signal, the capacitor _C3 is charged in a short time via the diode 35 and the resistor _R22 , and as a result, the second inverter circuit 36
inputs a high level signal and outputs a low level signal, the third inverter circuit 37 outputs a high level signal, the third transistor 38 is turned on, the heating resistor 10 is energized, and heat generation starts. Due to this heat generation, the temperature of the detection device 8 gradually rises.
Also, at this time, the second relay coil _RC2 is energized and the second relay coil RC2 is energized.
The relay switch _RS2 is turned on, the motor M starts operating, and the stirring device 2A is operated. Then, when sufficient time has elapsed after the light receiving element 32B is turned on and the charging of the capacitor _C3 is completed, the charging of the capacitor _C2 causes the first inverter circuit 35 to
When the input of the first inverter circuit 34 reaches a predetermined high level, the output of the first inverter circuit 34 becomes a low level. Thereafter, the input potential of the second inverter circuit 36 gradually decreases based on the discharge time constant of the resistors R ₂₃ and R ₂₄ serving as a timer circuit, the variable resistor 40, and the capacitor C ₃ . Even after the time from when the take-out switch S for taking out the frozen dessert to one cup has passed until it is turned off, that is, the time for taking out the frozen dessert (for example, 2 to 6 seconds), the second
The inverter circuit 36 inputs a high level signal continuously for, for example, 9 seconds after the takeout switch S is turned on.
The third inverter circuit 37 outputs a high level signal. When the input potential of the second inverter circuit 36 drops to, for example, 1/2 Vc.c., the second inverter circuit 36 outputs a high level signal, and the third inverter circuit 37 outputs a low level signal. Then, the transistor 38 is turned off and the heating resistor 10
The power supply to will be stopped. Therefore, as shown in FIG. 4, the energization time t ₂ of the heating resistor 10 is kept constant regardless of the change in the on-time t ₁ of the take-out switch S, and this energization time t ₂ is adjusted by adjusting the variable resistor 40. Adjusted by.

When the eject switch S is turned on as described above,
When the detected temperature of the refrigeration cylinder 2 by the thermal element 9 is low and the amplifier 15 outputs a low level signal and the electric compressor 3 and motor M are stopped,
The detection device 8 is warmed by the heat generated by the heat generating resistor 10, the temperature of the heat sensitive element 9 rises and its resistance value decreases, the output of the amplifier 15 increases and reaches the upper limit temperature, and the first transistor 21 is turned on. , the first relay coil _RC1 is energized, and when the take-out switch S is turned on, the electric compressor 3 and the motor M almost start operating. The freezing cylinder 2 is cooled by the operation of the freezing system, and the frozen dessert inside is also cooled, and the frozen dessert is stirred by the stirring device 2A.
When the take-out switch S is turned on and the removal of the frozen dessert is completed, and a predetermined period of time has elapsed since the take-out switch S was turned on, the power supply to the heating resistor 10 is stopped as described above. continues to operate, the temperature drop in the refrigeration cylinder 2 is transmitted to the heat sensitive element 9, the resistance value of the heat sensitive element 9 increases, the output of the amplifier 15 gradually decreases, and when the detected temperature of the heat sensitive element 9 falls to the lower limit temperature. The operation of the electric compressor 3 and the stirring device 2A is stopped.

Further, when the electric compressor 3 is stopped and the temperature of the frozen dessert is relatively high and the temperature of the heat-sensitive element 9 is close to the upper limit of the set temperature, when the take-out switch S is turned on, the heating resistor 10 is turned on as described above. The electric compressor 3 is started because the temperature of the heat sensitive element 9 increases significantly due to the heat generated by the electricity, and the temperature of the heat sensitive element 9 exceeds the upper limit of the set temperature. Since the temperature of the heat-sensitive element 9 considerably exceeds the upper limit of the set temperature, the difference from the lower limit of the set temperature is large, and the electric compressor 3
The driving time will be longer.

Furthermore, when the take-out switch S is turned on as described above, for example, the refrigeration system is in operation until just before the switch is turned on, and the temperature of the refrigeration cylinder 2 and the detection device 8 is low, and the heat generation resistor 10 generates heat. However, when the temperature detected by the heat-sensitive element 9 does not rise to the upper limit temperature, the second transistor 21 is not turned on and the operation of the refrigeration system is not started.
Then, when the eject switch S is turned on,
When the temperature of the temperature sensing element 9 rises due to the heat generated by the heating resistor 10 and reaches the upper limit temperature, the first and second transistors 20 and 21 are turned on, the first relay coil RC ₁ is energized, and the electric compressor 3 and motor are turned on. Operation of M is started.

In addition, if the electric compressor 3 and motor M were being operated when the take-out switch S was turned on,
Each operation continues.

Therefore, when taking out frozen desserts from the frozen dessert manufacturing apparatus, when the take-out switch S is turned on, the resistive heating element 10 is energized, and the heat sensing element 9 embedded in the detecting device 8 is immediately activated by the heat generated by the heating resistor. When the temperature of the thermosensing element rises and reaches the upper limit temperature, the amplifier 15 outputs a high level signal to turn on the first and second transistors 20 and 21, thereby energizing the first relay coil RC _1. According to
By turning on the first relay switch RS ₁ , the operation of the electric compressor 3 can be started. Therefore, when the frozen dessert is taken out and the mix is supplied from the mix tank 1 to the freezing cylinder 2, the rise in the temperature of the frozen dessert in the freezing cylinder 2 can be suppressed slightly, the softening point of the frozen dessert does not occur, and the quality is reduced. We can supply good frozen desserts.

Further, the operation of the electric compressor 3 is started due to the increased temperature of the heat-sensitive element 9 due to the heat generated by the heating resistor 10, and after the heating resistor 10 stops generating heat, the detection device 8 detects the transmission from the refrigeration cylinder 2. When the temperature of the heat-sensitive element 9 drops to a predetermined temperature, the amplifier 15 outputs a low level signal, the operation of the electric compressor 3 is automatically stopped, and the operation of the refrigeration system is stopped. Refrigeration cylinder 2
Also, the frozen dessert in the freezing cylinder is not overcooled, and the temperature of the frozen dessert is kept almost constant, so that the quality of the frozen dessert can be maintained even better.

(g) Effects of the Invention Since the present invention is a frozen dessert manufacturing apparatus configured as described above, when taking out a frozen dessert from a freezing cylinder, the heating resistor is energized by the operation of the take-out switch, and the heating resistor is heated. This allows the temperature of the heat-sensitive element to rise quickly, and when the predetermined temperature is reached, the operation of the refrigeration system can be started. This makes it possible to slightly suppress the rise in the temperature of the frozen dessert inside the freezing cylinder when taking out the frozen dessert, thereby improving quality. It is possible to provide good frozen desserts, and the temperature sensing element, whose temperature has temporarily risen due to the heat generated by the heating resistor, cools down due to heat transfer from the freezing cylinder when the heat generation stops, and when the temperature drops to a predetermined temperature, the refrigeration system starts operating. The freezing cylinder and the frozen desserts in the freezing cylinder are not overcooled, and the quality of the frozen desserts can be maintained in a better condition.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention,
Figure 1 is a schematic operating circuit diagram of the frozen dessert manufacturing equipment, Figure 2 is a schematic vertical sectional view of a detection device such as an electric compressor, and Figure 3 is a schematic longitudinal sectional view of a detection device such as an electric compressor.
4 is a diagram showing the operating characteristics of the take-out switch and the heating resistor, and FIG. 5 is a diagram showing the relationship between the temperature change of the heat-sensitive element and the operation of the electric compressor. 2... Refrigeration cylinder, 8... Detection device, 9...
...thermal element, 10... heating resistor, C... control circuit.

Claims (1)

[Claims] 1. In a frozen dessert manufacturing apparatus that appropriately supplies mix into a freezing cylinder connected to a freezing system and takes out frozen desserts such as soft serve ice cream produced in the freezing cylinder to the outside, a heat-sensitive element attached to the freezing cylinder is provided. and a heating resistor that heats the element; a control circuit that controls the operation of the refrigeration system based on the temperature detected by the heat-sensitive element; and a timer circuit that energizes the heat generating resistor for a predetermined period of time, and when the heat sensitive element is heated by the heat generated by the heat generating resistor and reaches a predetermined temperature, the control circuit starts operating the refrigeration system. Control device for frozen dessert manufacturing equipment.