JPH0542252B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a frozen dessert manufacturing apparatus for manufacturing frozen desserts such as ice cream shakes.

(B) Prior Art Frozen desserts generally have a tenacity peculiar to the milk fat content, and this tenacity becomes particularly noticeable the smaller the ice crystals, ie, the ice particles, in the frozen dessert. Therefore, by growing the ice crystal to a large size, the persistent feeling can be alleviated to some extent.

Conventional frozen dessert manufacturing equipment, for example,
As disclosed in Publication No. 35034, Publication Utility Model Publication No. 58-35034, etc., most of the devices simply control the cooling operation on and off, and such frozen dessert manufacturing equipment that only has a cooling function has a pull-down operation. Therefore, first microscopic ice crystals grow, and then by repeating the cooling operation on and off, the microscopic ice crystals become a source of stress, and although the ice crystals gradually grow larger, the frozen dessert becomes more persistent. It took a considerable amount of time to alleviate the problem.

(c) Problems to be Solved by the Invention In view of the above-mentioned conventional drawbacks, the present invention aims to accelerate the growth of ice crystals and alleviate the persistent feeling peculiar to frozen desserts in a short time after the pull-down operation is completed.

(d) Means for solving the problems In order to achieve the above object, the present invention provides a cooling chamber for cooling and stirring the supplied mix, an evaporation pipe provided on the outer periphery of the cooling chamber, and a cooling chamber for cooling and stirring the supplied mix. A frozen dessert extractor attached to the front of the chamber, a cooling means for cooling the cooling chamber by cooling the cooling chamber by condensing the high-temperature, high-pressure refrigerant compressed by the compressor and flowing it through the evaporation pipe in the condenser, and the high-temperature, high-pressure refrigerant. Frozen confectionery manufacturing comprising a hot gas heating means for directly flowing the gas into the evaporation pipe and heating the cooling chamber, and a heating control means for performing a heating operation after a cooling operation at startup and then shifting to a normal cooling operation. It is a device.

(e) Effect In the above configuration, when the pull-down operation is completed, the heating operation of the cooling chamber is performed. As a result, a portion of the frozen dessert base that has once hardened is thawed and separated into fat and water, and when normal cooling operation is performed in this state, microscopic ice crystals with some of the separated water remaining will burn together. Promotes consolidation.

(F) Embodiment An embodiment of the present invention will be described below based on the drawings. FIG. 1 shows a diagram of the cooling system of the present invention, including a front compressor 30, a front air-cooled condenser 31, and a double-tube front water-cooled condenser through which water passes through an inner tube (not shown in detail) and refrigerant passes through an outer tube. 32, a front cooling system in which a front receiver tank 33, a front cooling solenoid valve 34, a front expansion valve 35 employed as a pressure reducing device, a front evaporation pipe 36, and a front accumulator 37 are connected in an annular manner; A compressor 38, a rear air-cooled condenser 39, and a rear water-cooled condenser 4 having the same configuration as the front water-cooled condenser 32.
0, rear receiver tank 41, rear cooling solenoid valve 42, rear expansion valve 43 adopted as a pressure reducing device,
Rear evaporation pipe 44 and rear accumulator 4
5 are connected in a ring to form a rear cooling system.

Of these, the front evaporation pipe 30 of the front cooling system is wound around the front outer circumference of the cooling chamber 3 equipped with the extractor 4 on the front, and the rear evaporation pipe 44 of the rear cooling system is wound around the front outer circumference of the cooling chamber 3 equipped with the extractor 4 on the front side. By wrapping around the outer circumference of the rear part, the front cooling system can independently cool the front part of the cooling chamber 3, and the rear cooling system can independently cool the rear part of the cooling chamber 3. becomes. In the embodiment, the rear evaporation pipe 4 is approximately twice the winding area of the front evaporation pipe 36.
Although the winding area of 4 is set, this was determined in consideration of the capabilities of the front compressor 30 and the rear compressor 38, etc., and is not necessarily limited to the ratio of the example. The rear evaporation pipe 44 is not limited to a branched configuration, but may be a single pipe wound configuration. The present invention is further not limited to the pipe winding method, but extends to those that constitute a front evaporation region and a rear evaporation region.

The system also includes a front fan 46 that air-cools both the front air-cooled condenser 31 and the front water-cooled condenser 32 as a related device of the front cooling system, and responds to the condensing pressure when the pressure reaches a predetermined high pressure. A front water-saving valve 47 that opens is provided, and at the same time, the rear cooling system is also provided with a rear fan 48 and a rear water-saving valve 49 that air-cool both the rear air-cooled condenser 39 and the rear water-cooled condenser 40. According to this configuration, the water-cooled condensers 32 and 40 can fully expect that the refrigerant passing through the outer tubes will be cooled by the fans 46 and 48 even when water is not flowing through the inner tubes, which is extremely Become efficient. Furthermore, the configuration of the front bypass pipe 50 and the front hot gas solenoid valve 51 added to the front cooling system, and the configuration of the rear bypass pipe 52 and the rear hot gas solenoid valve 53 added to the rear cooling system are similar to ice crystals, which will be described later. , which acts to create ice particles.

Thus, the cooling operation of the front cooling system is independently controlled based on the temperature sensing operation of the front temperature detection element 54 using a thermistor, and the rear cooling system is independently controlled based on the temperature sensing operation of the front temperature detection element 55 using a thermistor. The cooling operation is independently controlled based on the temperature operation, and the front thermistor 54 is placed at the front end of the cooling chamber 3 near the extractor 4, and the rear thermistor 55 is placed at the front end of the cooling chamber 3 near the extractor 4, and the rear thermistor 55 is placed in a mix tank or other mix supply source. It is arranged at the rear end in the cooling chamber 3 near the inlet 14A to the cooling chamber 3 of the mix supply pipe 14 whose ends are connected. Note that the present invention has the front thermistor 54 as described above.
Although a direct temperature detection method is adopted in which the rear thermistor 55 is placed inside the cooling chamber 3, it is also possible to adopt an indirect temperature detection method in which these are attached to the outer wall surface of the cooling chamber 3.

Next, the structure of the extractor 4 attached to the front of the cooling chamber 3 will be described in detail based on FIG. A resin cover 81 that closes the front surface of the cooling chamber 3 has a cylindrical vertical hole 82 that is open at both ends, and a cylindrical horizontal hole 8 that extends toward the cooling chamber 3 from approximately the middle of the vertical hole 82 and has an open end.
3 is formed. At the opening edge of this side hole 83 on the side of the cooling chamber 3, a bearing plate 8 is provided with an outlet 84 formed at the lower part.
5 is screwed to the bearing plate 85, and the bearing plate 85 slidably supports a shaft 87 extending rearward from an umbrella-shaped valve 86. Further, a coil spring 88 is arranged between the bearing plate 85 and the valve 86 so as to surround the shaft 87.
The spring 88 presses a step 89 normally formed in the middle of the lateral hole 83 so that the valve 86 closes the lateral hole 83. Although the valve 86 is mainly made of stainless steel, the stepped portion 8
The portion pressed by 9 is made of silicone material to improve sealing performance.

On the other hand, the mechanism for moving the valve 86 rearward against the spring force and opening the horizontal hole 83 has a sliding mechanism in which the rear end is in contact with the tip of the valve 86 and the front end is inserted through the cover 81 and protrudes forward. operating rod 9
0, a lever 92 whose lower part is rotatably connected to the front part of the actuating rod 90 to reciprocate the actuating rod 90, and a lever 92 having a rotation fulcrum 91 connected to the cover 81 at the upper part thereof; It is comprised of a solenoid device 94 having a plunger 94A connected to an operating pin 93 perpendicular to the upper rear surface of the lever 92, and a return spring 178 for returning the lever 92 to its normal state. According to this configuration, the valve 86 is opened and closed automatically based on the operation of the solenoid 94, and can also be opened and closed by manually operating the lever 92.

In addition, a lower end opening is provided at the bottom of the vertical hole 82 as an extraction port 9.
A stirring blade 97 is used as a mixing chamber 95 of 5A, and has a large number of through holes 96 in the mixing chamber 95.
is placed. This stirring blade 97 is connected to the lower part of a rotating shaft 99 that extends upward through a sliding bearing 98 press-fitted into the upper part of the vertical hole 82 .
Further, the rotating shaft 99 is connected to a flexible cable 101 passing within the protective tube 100, and rotation is transmitted by connecting the end of this cable 101 to a motor (not shown). A cylindrical bearing 103 that is screwed onto the rear surface of the cover 81 and projects inward of the cooling chamber 3 supports the front portion of the stirrer 72. The mixing chamber 95 is provided for mixing the frozen dessert base in the cooling chamber 3 and the syrup supplied to the mixing chamber 95 from another route.

The support 74 for placing the cup 73 at a position facing below the extraction port 95A of the mixing chamber 95 consists of a conical base 74A and four support plates arranged on the outer surface of the conical base 74A at intervals of 90 degrees in the vertical direction. 74B, and a fitting stepped portion 74C is formed at the corner of the support plate 74B to fit into the lower surface of the cup 73 to stably support the cup 73. A weight detection device 105 is configured in combination with this support 74. The device 105 includes a magnet 106 fixed to the lower surface of the base 74A, and a base 1
Hall element 108 attached to the back surface of 07,
Placed between the magnet 106 and the base 107, the magnet 1
06 in a predetermined position away from the Hall element 108, and further includes a base 107 so that when a load is applied to the support 74, the support 74 is lowered with almost no horizontal movement. A cylindrical lower guide 110 protruding upward from
A cylindrical upper guide 111 that protrudes downward from the lower surface of the base 74A and has a slightly larger diameter than the lower guide 110 is provided.

In such a weight detection device 105, when the support 74 is lowered due to the weight of the frozen dessert extracted into the cup 73, the magnet 106 approaches the Hall element 108, and the gap between the magnet 106 and the Hall element 108 is caused by this. The extraction operation is automatically terminated based on the output voltage of the Hall element 108 in response to a change in the magnet.

Next, the electric circuit configuration of the present invention is shown in FIGS. 3 and 4.
This will be explained based on the diagram. 112 is a power switch, 1
13 is an operation switch having a cooling contact 113A and a preparation contact 113B; 16 is a mix supply solenoid valve connected to the mix supply pipe 14;
A switch 17A that opens when a predetermined amount of mix is supplied to the switch 17A is connected in series. 127 is a cooling control circuit that collectively controls the front compressor 30, the rear compressor 38, the front cooling solenoid valve 34, the rear cooling solenoid valve 42, the front hot gas solenoid valve 51, and the rear hot gas solenoid valve 54.

As shown in detail in FIG. 4, the cooling control circuit includes a front cooling system control circuit 128 that controls the operation of the above-mentioned front cooling system, and a rear cooling system control circuit 129 that controls the operation of the rear cooling system.
and a hot gas control circuit 130 for making ice crystals, of which the front cooling system control circuit 128 and the rear cooling system control circuit 129 have the same configuration except that the set temperature is different.

The specific circuit configurations of these will be explained below.
First, in the front cooling system control circuit 128, 131 is a bridge circuit composed of the above-mentioned front thermistor 54, resistors 132, 133, 134, and 135, and a variable resistor 136, and 137 is a bridge circuit that changes the resistance value of the thermistor 54. An amplifier 138 amplifies the unbalanced voltage generated in the bridge by the positive input terminal 138.
A first comparator 1 connected to A and having the output of amplifier 137 connected to negative input terminal 138B;
41 connects the output of the amplifier 137 to the positive input terminal 14
1A and the midpoint of the resistors 140 and 142 is connected to the negative input terminal 141B, and the output of the first comparator 138 is connected to the first transistor 1 via the diode 143.
44 and the collector of the second transistor 145, and the output of the second comparator 141 is connected between the collector of the first transistor 144 and the second transistor 14 through the diode 146.
It is connected between the bases of 5. 147 is a third transistor connected between the second transistor 145 and the ground via dividing resistors 148 and 148 connected in series.

On the other hand, in the rear cooling system control circuit 129, the internal configuration of the temperature detection circuit 150 to which the rear thermistor 55 is connected is the same as that of the front cooling system control circuit 128 described above, so a description thereof will be omitted. However, the difference between the two is that the rear cooling system control circuit 129 has a slightly higher temperature setting than the front cooling system control circuit 128.

Further, 151 is an AND circuit that inputs the output taken out from the collector of the third transistor 147 and the output taken out from the rear temperature detection circuit 150, and 152 inputs the collector output of the third transistor 147, and its inverted output. AND circuit 153
An inverter 154 inputs the output of the rear temperature detection circuit 150 and inputs its inverted output to the AND circuit 153. An inverter 155 inputs the output of the AND circuit 153 and inputs the output of the AND circuit 151 to the diode 156. A flip-flop 158 receives the reset input via the output of the inverter 152 and the flip-flop 155.
159 is an AND circuit that receives the output of the inverter 154 and the flip-flop 155; 160 is an inverter that receives the output of the flip-flop 155;
1 is a time constant circuit made up of a resistor 161A and a capacitor 161B, 162 is an AND circuit to which the inverted output of the inverter 160 and the output of the time constant circuit 161 are input, 163 is the output of the AND circuit 162 as a set input, and the reset terminal is connected to the ground 164. A flip-flop connected to
57 as a reset input for the flip-flop 155. 165 is the AND circuit 1
168 is an AND circuit that receives the collector output of the third transistor 147 and the inverted output of the inverter 165;
169 is an AND circuit that inputs the output of the rear temperature detection circuit 150 and the inverted output of the inverter 165; 170 is a fourth transistor that receives the output of the AND circuit 168 and becomes conductive;
The first relay 171 is energized by the ON of 70.
are connected. 172 is a fifth transistor that becomes conductive upon receiving the output of the AND circuit 169;
Relay 173 is connected. A sixth transistor 174 becomes conductive upon receiving the output of the AND circuit 158, and is connected to a third relay 175 that is excited when the transistor 174 is turned on. 17
6 is a seventh circuit that receives the output of the AND circuit 159 and conducts.
, and the transistor 176 is turned on.
A fourth relay 177 is connected to the fourth relay 177, which is excited by.

Therefore, in FIG. 3, the front cooling solenoid valve 34
normally open contact 171 of the first relay 171 in series with
A, the normally open contact 173A of the second relay 173 is connected in series with the rear cooling solenoid valve 42, the normally open contact 175A of the third relay 175 is connected in series with the front hot gas solenoid valve 51, The normally open contact 177A of the fourth relay 177 is connected in series with the rear hot gas solenoid valve 53, and the normally open contact 1 of the first relay 171 is connected in series with the front compressor 30.
71B and a parallel circuit of normally open contact 175B of third relay 175 are connected, and a parallel circuit of normally open contact 173B of second relay 173 and normally open contact 177B of fourth relay 177 is connected in series with rear compressor .

Next, the operation of the present invention will be explained. The operation starts with supplying the mix to the mix cooling chamber 3. When the operation switch 113 is first placed at the preparation contact 113B and the power switch 112 is turned on, the mix supply solenoid valve 16 is opened. As a result, the mix is fed to the cooling chamber 3 through the mix supply pipe 14 from the rear inlet 14A. The pressure switch 17A, which supplies a predetermined amount of mix to the cooling chamber 3, opens and closes the mix supply solenoid valve 16, ending the supply of mix.

After that, the operating switch 113 is connected to the cooling contact 11.
When switched to 3A, the cooling control circuit 27 starts a cooling operation, that is, a pull-down operation. The circuit operation at this time will be explained based on FIGS. 3 and 4. Since the temperature of the mix supplied to the cooling chamber 3 is high, the resistance values of the front thermistor 54 and the rear thermistor 55 are small.
Its positive input voltage is high, and its output voltage is also high. The output of this amplifier 137 is connected to the minus input terminal 138B of the first comparator 138 and the plus input terminal 141A of the second comparator 141. Here, the output voltage of the amplifier 137 is preset to be higher than the fixed voltages V ₁ and V ₂ when the temperature is high, and is preset to be lower than the fixed voltages V ₁ and V ₂ when the temperature is low. be done. As a result, the output voltage of the first comparator 138 becomes "L" and the output voltage of the second comparator 141 becomes "H". At this time, the voltage of V ₃ is pulled to "L" through the diode 143, so the first transistor 144 is turned OFF, and the voltage of V ₄ becomes "H" due to the reverse bias of the diode 146, as the first transistor 144 is turned OFF. As a result, the second transistor 145 is also turned off. Furthermore, since the collector voltage of the second transistor 145 is "L", the third transistor 147 is also turned off. Therefore, the collector voltage of the third transistor 147 becomes "H". Similarly to this, the rear temperature detection circuit 15
The output voltage of 0 also becomes "H".

In response to this, the output voltage of AND circuit 151 becomes "H" and the output voltages of inverters 152 and 154 become "L". At this time, flipflop 155
Since the output voltage "H" of the AND circuit 151 is inputted to the reset input of the flip-flop 155 through the diode 156, the output voltage of the flip-flop 155 is "L". In response to these signals, the output voltages of AND circuits 158 and 159 become "L". On the other hand, since the collector voltage of the third transistor 147 and the output voltage of the inverter 165 are both "H", the output voltage of the AND circuit 168 is "H".
Since both the output voltage of the rear temperature detection circuit 150 and the output voltage of the inverter 165 are "H", the output voltage of the AND circuit 169 is "H".
Therefore, the fourth transistor 170 and the fifth transistor 172 are turned on, the first relay 171 and the second relay 173 are energized, and the normally open contacts 171A and 171B of the first relay 171 shown in FIG.
and the normally open contacts 173A and 17 of the second relay 173
Close 3B. As a result, the front compressor 30 is operated, the front cooling solenoid valve 34 is opened, and cooling operation by the front cooling system is started, and the rear compressor 38 is operated, and the rear cooling solenoid valve 42 is opened. The valve also starts cooling operation by the rear cooling system. At this time, the front fan 46 and the rear fan 48 also rotate to cool the front capacitors 31 and 32 and the rear capacitors 39 and 40.

By the way, the output voltage of the inverter 160 is "H" because the output voltage "L" of the flip-flop 155 is input, and the output voltage "L" of the flip-flop 155 is passed through this and the resistor 161A.
The output calculation of the AND circuit 162 inputting is "L".
becomes. Since this is connected to the set input of the flip-flop 163, the flip-flop 163 has a set input "L" and a reset input always "L", so the output voltage of the flip-flop 163 maintains the "L" condition.

As the mix supplied to the cooling chamber 3 is cooled, it gradually hardens and is finished as a frozen dessert base. As the frozen dessert base temperature decreases, the resistance values of the front thermistor 54 and the rear thermistor 55 increase. For example, if the front thermistor 54 detects a predetermined temperature drop of the frozen dessert base, the positive input voltage of the amplifier 137 becomes low, and the output voltage of the amplifier 137 also becomes low. At this time, the output voltage of the amplifier 137 becomes lower than the fixed voltages V ₁ and V ₂ and the output voltage of the first comparator 1 becomes lower than the fixed voltages V 1 and V 2 .
38 output voltage is "H", second comparator 14
The output voltage of 1 becomes "L". This results in _V3
The voltage at V4 is unaffected by the reverse bias of the diode 143, and the voltage at _V4 is the voltage at the second comparator 14.
1, a potential difference is generated between the base and emitter of the second transistor 145, and the second transistor 145 is turned on, and the first transistor 144 is also turned on. Furthermore, since the collector voltage of the second transistor 145 is "H", the third transistor 147 is also turned on. Therefore, the collector voltage of the third transistor 147 becomes "L".

On the other hand, if the rear thermistor 55 does not detect the predetermined temperature drop of the frozen dessert base and the output voltage of the rear temperature detection circuit 150 is maintained at "H", the output voltage of the AND circuit 151 is " The output voltage of the inverter 152 becomes "H", and the output voltage of the inverter 154 becomes "L".
As a result, the output voltage to the AND circuit 153 becomes "L".
Since both the set and reset input voltages of the flip-flop 155 become "L", the output of the flip-flop 155 remains "L". In response to this, AND circuits 158 and 159
The output voltage becomes "L". On the other hand, AND circuit 1
68, since the collector voltage of the third transistor 147 is "L" and the output voltage of the inverter 165 is "H", its output voltage is "L", and the AND circuit 169 outputs the output of the rear temperature detection circuit 150 and the inverter 165. Since both voltages are "H", the output voltage continues to be "H". Therefore, the fourth transistor 170 is turned off, and the first relay 171 is turned off.
is de-energized and the normally open contact 1 of the relay 171
71A and 171B are opened. By this,
When the front compressor 30 is stopped, the front cooling solenoid valve 34 is closed, and the operation of the front cooling system is stopped. On the other hand, the fifth transistor 172
The normally open contact 173A of the second relay 173 continues to be ON, and the second relay 173 continues to be in the excited state.
The operation of the rear compressor 38 and the rear cooling solenoid valve 42 continues through the terminals 173B and 173B, and only the rear cooling system is operated.

When the rear thermistor 55 detects a predetermined temperature drop of the frozen dessert base, the rear temperature detection circuit 1
The output voltage of 50 is also "L". Then, when the collector voltage of the third transistor 147 and the output voltage of the rear temperature detection circuit 150 both become "L",
The output voltage of the AND circuit 151 is "L", and the output voltages of the inverters 152 and 154 are "H".
As a result, the output voltage of the AND circuit 153 becomes "H".
Therefore, the set input voltage of the flip-flop 155 becomes "H", the reset input voltage becomes "L", and the output voltage of the flip-flop 155 changes to "H". As a result, the output voltages of the AND circuits 158 and 159 become "H", and the output voltage of the AND circuit 169 becomes "L". Therefore, the fifth transistor 172 is turned off, the excitation of the second relay 173 is released, and the normally open contact 173A of the relay 173 is turned off.
and 173B are opened. This closes the rear cooling solenoid valve 42 and stops the operation of the rear cooling system.

As mentioned above, when the initial cooling operation by the front cooling system and the rear cooling system both stop,
The output voltages of AND circuits 158 and 159 both become "H". Therefore, the sixth transistor 174
The seventh transistor 176 is turned on, the third relay 175 and the fourth relay 177 are excited, and the normally open contacts 175A and 175B of the third relay 175 are turned on.
and the normally open contacts 177A and 1 of the fourth relay 177.
77B is closed. As a result, the front compressor 34 is operated, and the front hot gas solenoid valve 51
opens to start heating operation of the front part of the cooling chamber 3 which circulates the hot gas to the front evaporation vibrator 36 through the bypass pipe 50. At the same time, the rear compressor 38 is operated, and the rear hot gas solenoid valve 53 opens to circulate the hot gas to the front evaporation vibrator 36 through the bypass pipe 50. 52 to circulate the hot gas to the rear evaporation pipe 44 to start heating the rear part of the cooling chamber 3.

Such heating operation of the cooling chamber 3 is carried out by thawing the microscopic ice crystals contained in the once hardened frozen dessert base to separate it into fat and water, and by re-cooling in this state, the separated water is removed. promotes the sintering action of the remaining minute ice crystals, allowing the ice crystals to grow larger in a shorter time, and these ice crystals are effective in eliminating the stickiness of the final frozen dessert. . The heating operation for making ice crystals can be solved by performing it once during bulldown, with some exceptions. In other words, once ice crystals of a certain size are made, even if new ice is supplied, the ice crystals already present in the cooling chamber 3 will act as a stimulus and the ice crystals will easily grow. be.

By the way, when the output voltage of the flip-flop 155 changes to "H", the output voltage of the inverter 160 becomes "L", so the output voltage of the AND circuit 162 becomes "L", and both the set and reset input voltages of the flip-flop 163 become "L". Therefore, the output voltage of the flip-flop 163 is maintained at "L".

When the cooling chamber 3 is heated and the temperature of the frozen dessert base becomes high, and the front thermistor 54 detects a predetermined temperature of the frozen dessert base, the resistance value of the front thermistor 54 becomes small, and as described above, the temperature of the frozen dessert base becomes high. The collector voltage of the third transistor 147 changes to "H" again. At this time, if the output voltage of the rear temperature detection circuit 150 is maintained at "L", the internal voltage of the AND circuit 151 is "L", and the inverter 152
The output voltage of the inverter 154 is also "L", and the output voltage of the inverter 154 is "H". Originally, the output voltage of the AND circuit 153 receiving the outputs of the inverters 152 and 154 becomes "L". At this time, since both the set and reset input voltages of the flip-flop 155 are "L", the internal voltage of the flip-flop 155 is maintained at "H". Therefore, the AND circuit 158
The output voltage of the sixth transistor 1 becomes "L", and the output voltage of the sixth transistor 1 becomes "L".
74 is turned off, the excitation of the third relay 175 is released, and the normally open contacts 175A and 175B of the relay 175 are opened. As a result, the front compressor 30 stops and the front hot gas solenoid valve 51 closes to stop heating the front part of the cooling chamber 3.
Only the heating operation of the rear part of the cooling chamber 3 continues. In addition,
The output voltage of the AND circuit 159, which is at "H" at this time, is input to the AND circuit 168 via the inverter 165, so the output voltage is "L" and the fourth transistor 170 is not turned on. Cooling operation of the front cooling system is not started.

When the rear thermistor 55 detects a predetermined rise in temperature of the frozen dessert base, the rear thermistor 55
The resistance value becomes small, and the output voltage of the rear temperature detection circuit 150 changes to "H" again as described above. Then, the output voltage of the AND circuit 159 becomes "L", turning off the seventh transistor 176 and turning off the fourth transistor.
When the relay 177 is de-energized, the relay 17
No. 7 normally open contacts 177A and 177B open.
As a result, the rear hot gas solenoid valve 53 closes and the heating operation of the rear part of the cooling chamber 3 is stopped. Note that the rear compressor 38 continues to operate as described below.

In this way, the condition that the collector voltage of the third transistor 147 and the output voltage of the rear temperature detection circuit 150 are both "H" under which the heating operation of both the front and rear parts of the cooling chamber 3 is stopped is the above-mentioned cooling operation full-down condition. The conditions are the same as at the start of operation, and the fourth transistor 170 and the fifth transistor 172 are ON.
Then, the first relay 171 and the second relay 173 are excited, and the normally open contact 171A of the first relay 171
and 171B and the normally open contact 17 of the second relay 173
3A and 173B are closed. As a result, the front compressor 30 is operated, the front cooling solenoid valve 34 is opened, and the cooling operation of the front cooling system is restarted, and the rear compressor 38 is connected and operated via the normally open contact 173B. , the rear cooling solenoid valve 42 is opened and the cooling operation of the rear cooling system is resumed.

Here, when the output voltage of the flip-flop 155 changes from "H" to "L", the inverter 16
0's output voltage changes from "L" to "H", but the input voltage of the AND circuit 162 through the resistor 161 slowly changes from "H" to "L" due to the discharge time of the time constant circuit 161. change. At this time, the output voltage of the AND circuit 162 becomes "H" instantly. As a result, the set input voltage of the flip-flop 163 becomes "H" and the reset input voltage becomes "L", and the output voltage of the flip-flop 163 becomes "H". Once the output voltage of this flip-flop 163 becomes "H", the output voltage of this flip-flop 163 becomes "H".
Since the reset input voltage always remains “L”,
After that, the output voltage of the flip-flop 163 is "H".
remains unchanged. Furthermore, since the output of flip-flop 163 is connected to the reset input of flip-flop 155 through diode 157, the output voltage of flip-flop 155 is also low.
It will never change.

Therefore, from now on, AND circuits 158 and 15
The sixth and seventh transistors 174 and 176 are turned on because the output voltage of the transistor 9 never becomes "H".
Therefore, the front and rear hot gas solenoid valves 5
1 and 53 do not operate and heating operation is not performed.
Also, since the input voltage of one of the AND circuits 168 and 169 remains "H", the AND circuit 168
and 169, the output voltage is determined by the other input state. That is, the AND circuit 168 changes its output depending on the state of the output voltage based on the detection operation of the front thermistor 54, and the AND circuit 169 changes its output depending on the state of the output voltage based on the detection operation of the rear thermistor 55. As a result, the front cooling system control circuit 128
Based on the detection operation of The cooling operation of the rear cooling system is independently controlled based on the detection operation of the thermistor 55, thereby maintaining the frozen dessert base at the rear of the cooling chamber 3 in an ideal hardness state.

The operation of extracting the final frozen dessert by mixing syrup with the frozen dessert base in the cooling chamber 3 that has been finished as described above will be explained below. When an extraction command is issued, the solenoid 94 is energized, the plunger 94A is attracted, and the operating pin 93 is moved to the lever 9.
Pull 2 forward. Then, the lever 92 moves to the fulcrum 91
The operating eave 90 is moved rearward. Due to this rearward movement of the operating eave 90, the valve 86
is pressed rearward against the spring 88 to open the horizontal hole 83. As a result, the frozen dessert base in the cooling chamber 3 is delivered by the stirrer 72 from the outlet 84 to the mixing chamber 95 through the side hole 83. At the same time, syrup is fed into the mixing chamber 95.

The frozen dessert base and syrup that are continuously supplied to the mixing chamber 95 are mixed at high speed by the stirring blade 97 and finished as a frozen dessert.
It is extracted continuously from cup 73. Cup 7
When the weight detection device 105 detects that a predetermined amount of frozen dessert has been extracted in step 3, the supply of syrup is stopped, the excitation to the solenoid 94 is released, and the lever 92 is returned to its normal position by the action of the return spring 178. , the operating eave 90 following this also returns to the forward position. As a result, the valve 86 is pressed against the step 89 of the horizontal hole 83 by the coil spring 88, closing the horizontal hole 83 and stopping the supply of the frozen dessert base.Furthermore, the stirring blade 97 is stopped and the frozen dessert extraction operation is stopped. end.

(G) Effects of the Invention As described above, the present invention performs a heating operation after the pull-down operation to thaw the once hardened frozen dessert base and separate it into fat and water, and then performs a normal cooling operation. As a result, the separated moisture promotes the mutual sintering effect of minute amounts of ice crystals, speeding up the growth of ice crystals, and allowing a less sticky frozen dessert to be extracted from the pull-down in a short time. It offers significant advantages.

[Brief explanation of the drawing]

Fig. 1 is a cooling system diagram of the frozen dessert manufacturing apparatus of the present invention, Fig. 2 is a side sectional view showing the internal structure of the extractor,
FIG. 3 is a schematic electrical circuit diagram of the present invention, and FIG. 4 is an electrical circuit diagram of the main part of the present invention. 3...Cooling chamber, 4 ...Extractor, 30...Front compressor, 31...Front air cooling condenser, 32
...Front water-cooled condenser, 36... Front evaporation pipe, 38... Rear compressor, 39... Rear air-cooled condenser, 40... Rear water-cooled condenser, 4
4... Rear evaporation pipe, 50... Front bypass pipe, 51... Front hot gas solenoid valve, 52... Rear bypass pipe, 53... Rear hot gas solenoid valve,
54...Front thermistor, 55...Rear thermistor, 128 ...Front cooling system control circuit, 12
9... Rear cooling system control circuit, 130 ... Hot gas control circuit.

Claims (1)

[Claims] 1. A cooling chamber for cooling and stirring the supplied mix, an evaporation pipe provided on the outer periphery of the cooling chamber, and a frozen dessert extractor attached to the front of the cooling chamber;
The refrigerant compressed in the compressor to a high temperature and high pressure is condensed in a condenser and then flowed into an evaporation pipe to cool the cooling chamber. 1. A frozen dessert manufacturing apparatus characterized by being provided with a hot gas heating means for heating, and a heating control means for controlling to perform a heating operation after a cooling operation at startup and then shift to a normal cooling operation.