JP2567729B2 - Cooling operation control device for frozen dessert production equipment - Google Patents

Description

TECHNICAL FIELD The present invention relates to an apparatus for producing frozen desserts such as soft ice cream and ice cream shakes, and more particularly to an apparatus for producing frozen desserts for controlling a mix in an appropriate cooled state. Is.

(B) Conventional technology In this type of device, in order to provide a frozen dessert, for example, a soft ice cream having an appropriate product temperature and hardness, the mix as the raw material is cooled and stirred to soft ice cream. It is necessary to properly control the cooling of the cooling cylinder that manufactures. As the cooling control, two systems of a temperature type cooling control and a torque control type are generally used. As shown in Japanese Utility Model Application Laid-Open No. 63-58586, the temperature type cooling control is performed by indirectly detecting the temperature of the soft cream from outside the cooling cylinder and performing cooling control. That is, when the thermo-sensitive part reaches the set value (OFF point) by cooling, the cooling operation is stopped, and when the thermo-sensitive part rises to the ON point, the cooling operation is restarted and the cooling operation is continued until the thermo-sensitive part reaches the OFF point. By repeating this operation, the soft serve temperature is maintained in an appropriate temperature range.

The temperature setting can be changed to accommodate various soft cream mixes. As a method similar to the above, there is a method of detecting and controlling the refrigerant temperature and the refrigerant pressure of the cooler.

On the other hand, as shown in Japanese Patent Application Laid-Open No. 63-52843, the torque control method, as the soft cream is completed,
It is a control system that utilizes the increase of stirring power, and it can detect the increase of the stirring load mechanically or the increase of the input of the stirring motor electrically to make it appropriate by operating or stopping the stirring. I am trying to get the best quality. Even with this method, various soft ice cream mixes can be supported, so the torque setting can be changed.

(C) Problems to be Solved by the Invention However, in the former temperature control method, the cooling stop depends on the set value of the cooling OFF point. , Cooling is off
There is a possibility that the cooling may be continued for a long time until the temperature is reduced, and then there is a problem that the ice cream becomes too hard and too cold, or an uneconomic situation due to the long-term cooling.

On the other hand, in the latter torque control method, stirring is the main constituent, but when the soft cream is excessively stirred, the structure of the soft cream is destroyed and softened due to the so-called "fell", and the temperature is cold. However, there is an inconvenience that the cone cannot be arranged in a good condition.

Thus, it cannot be said that satisfactory cooling control can always be performed by the conventional method. Generally, the relationship between soft ice cream product temperature and cooling operation time in a soft ice cream freezer and the relationship between agitator (beater) motor input and cooling operation time are
It looks like Figure 18. From this figure, it can be seen that the temperature of the soft ice cream or the input of the beater motor changes up to a certain point, but does not change thereafter no matter how much the cooling operation is continued. This is because the stirring load increases as the soft ice cream cools and becomes harder, and the cooling capacity reaches equilibrium.

On the other hand, when the soft serve ice cream is excessively agitated, "sagging" occurs as described above. Therefore, it is necessary to set the temperature or the torque so that the cooling operation is performed intermittently. In this case, there is no problem as long as the adjustment range of the freezer temperature setting or torque setting is always within the range of continuous operation, but in order to correspond to various commercially available mixes, set the setting range to some extent and use At present, it is necessary to set the temperature or the torque suitable for the mix to be performed. Therefore, if the setting by the user is not appropriate, continuous cooling and excessive agitation occur, and the quality of the soft serve is significantly impaired.

The present invention has been made in view of the above problems. Regardless of whether the temperature setting by the user is appropriate or not, when the cooling continuously continues for more than the limit, the set value is automatically corrected and intermittent. It is possible to maintain the quality of soft serve ice cream by enabling the operation and returning the initial setting value to control the cooling operation again after the lapse of a predetermined time after the cooling operation is controlled with the corrected setting value. It is intended to provide a cooling operation control device for a frozen dessert manufacturing apparatus for the purpose.

(D) Means for Solving the Problems In order to achieve the above object, the present invention cools and stirs a mix supplied from a hopper to produce frozen dessert, and cools the cooling cylinder to a predetermined set temperature. In a cooling operation control device for a frozen dessert manufacturing apparatus including a freezing device, a cooling monitoring timer for monitoring a continuous cooling operation time, means for correcting the set temperature when a predetermined time has elapsed by the cooling monitoring timer, and setting by the means A release timer that starts when the temperature is corrected and returns the corrected set temperature to the set temperature before correction when a predetermined time has elapsed, and means for controlling the operation of the refrigeration system based on the set temperature before or after correction It is a cooling operation control device of a frozen dessert manufacturing apparatus provided with.

(E) Operation According to the present invention, if the cooling state does not drop to the initially set temperature even after being kept for a predetermined period of time, the set temperature is automatically corrected upward to this new corrected set temperature. Since the cooling operation is controlled on the basis of the cooling operation, the cooling operation can be stopped, and it is possible to prevent the soft ice cream from becoming too hard due to being too cold or from becoming a soft ice cream with fatigue due to excessive stirring. Also, if the cooling operation control is continued at the corrected set temperature indefinitely, cooling will be insufficient in the future, so by returning the corrected set temperature to the initial set temperature,
It is possible to prevent insufficient cooling of the soft serve ice cream.

(F) Example An example of the present invention will be described below with reference to the drawings.

FIG. 1 (a) is a schematic side view of the internal structure of a soft ice cream production device according to one embodiment of the present invention, FIG. 1 (b) is a front view of the soft ice cream production device, and FIG. 2 is a refrigerant circuit diagram. As shown, two kinds of soft ice creams, for example, a vanilla soft ice cream and a chocolate soft ice cream, are manufactured in the same apparatus. Therefore, two sets of the apparatus configuration shown in FIG. And, as the soft ice cream that can be extracted, three types of vanilla soft ice cream, chocolate soft ice cream, and a mixed soft ice cream obtained by mixing these are available for sale.

First, in FIG. 1A, (1) is the device body,
(2) is a hopper for storing a raw material of frozen dessert (soft ice cream), that is, a so-called mix, which has a hopper cover (3) to be removed at the time of replenishing the mix, and a hopper cooling coil wound around the hopper (2) At 4, the mix is kept cool. Further, the impeller (5) provided on the inner bottom is rotated by the impeller motor (6),
The mix is agitated to prevent freezing. Further, this impeller (5) is rotationally driven even when a predetermined amount or more of the mix is put in the hopper (2) and the hopper cooling coil (4) is heated and sterilized by a refrigerant gas that flows in the opposite direction to the cooling, that is, hot gas. To be done. (7) is the hopper (2)
In the mix level sensor that detects whether the mix has a predetermined amount or more, consisting of a pair of conductive electrodes, if the mix is insufficient and below the predetermined amount, the interruption of the conductive state through the mix is detected and the heat sterilization described later. The hot gas flow is stopped so that the process is not performed, and the impeller (5) is not rotated. Reference numeral (8) is a cooling cylinder for producing a frozen dessert by rotating and stirring the mix appropriately supplied from the hopper (2) by the mix supply device (9) by a beater (10), and an evaporator (11) is arranged around the cooling cylinder. ing. The beater (10) is rotated via a beater motor (12), a drive transmission belt, a speed reducer (13), and a rotary shaft. The manufactured frozen dessert is taken out by operating the take-out lever (15) arranged on the freezer door (14) to move the plunger (16) up and down to open the extraction path (17). Here, in this device, three take-out levers are provided as shown in FIG. That is, the left eject lever (15A) is for vanilla, the right eject lever (15B) is for chocolate, and the central eject lever (15C) is for vanilla and chocolate. Therefore, as shown in Fig. 2, another cooling cylinder (8B) is provided.
The cooling cylinder (8A) is for vanilla soft ice cream production, the cooling cylinder (8B) is for chocolate soft ice cream production, and the takeout lever (15A) and cooling cylinder (8
As a one-to-one correspondence between the A) and the extraction lever (15B) and the cooling cylinder (8B) through the extraction passage (17B). To extract chocolate, while the extraction lever (15
For C), the mixed soft ice cream can be extracted by establishing a communication relationship with both cooling cylinders (8A) and (8B) via extraction paths (17C) and (17C).
When the frozen dessert is taken out, each beater (10) (the other one is not shown) rotates to also serve the function of delivering the frozen dessert.

Next, a refrigerating device for cooling the hopper (2) and the cooling cylinder (8) will be described. (18) is a compressor, (19) is a four-way valve that switches the flow direction of the refrigerant discharged from the compressor (18) between the freezing cycle (solid line state) and the heating cycle (dotted line state), and (20) water cooling The condenser condenses and liquefies the high-temperature, high-pressure refrigerant gas flowing through the check valve (21) into a liquefied refrigerant.
The liquefied refrigerant splits into two parts when it comes out of the dryer (23) through the check valve (22), and one of them is separated into the evaporator (1) via the cooling cylinder valve (24) and the cooling cylinder capillary tube (25).
1), where it evaporates and vaporizes, and the cooling cylinder (8)
To cool. Then, the other flows into the hopper cooling coil (4) through the cooling hopper valve (26) and the hopper capillary tube (27) in the previous stage, and similarly evaporates and vaporizes here to cool the hopper (2), and then the latter stage. Exit via the capillary tube (28). Then, the refrigerant gas after cooling the cooling cylinder (8) and the hopper (2) joins the accumulator (30) and then forms a refrigeration cycle that returns to the compressor (18) via the four-way valve (19),
A cooling operation is performed in which the refrigerant flows in the direction of the solid line. By the way, in this cooling operation, the cooling cylinder (8) and the hopper (2) are set in a predetermined set temperature range (cooling cylinder; about -3 ° C to -8 ° C, hopper;
It is necessary to keep cooling at ℃ to 10 ℃. Therefore, the cylinder sensor (31) that detects the temperature of the cooling cylinder (8)
With this sensor (31), the cooling cylinder valve (24) is turned on (open) and the compressor (18) is turned on at the preset upper limit set temperature, and cooling is performed at the lower limit set temperature. Cooling operation control is performed by closing (OFF) the cylinder valve (24) and turning off the compressor (18). Similarly, a hopper sensor (32) for detecting the temperature of the hopper (2) is also provided for the hopper (2), and cooling hopper valves (26) are respectively set at preset upper and lower preset temperature values.
Open and close and turn on and off the compressor (18).
However, the cooling cylinder (8) is controlled with priority, and under the condition that the cooling cylinder valve (24) is OFF,
The cooling hopper valve (26) is turned on.

After being sold under the cooling operation described above, when the store is closed, the mix is sterilized by the heating method.
In this case, the refrigeration system is switched from the refrigeration cycle to the operation of the heating cycle. That is, the four-way valve (19) is operated to flow the refrigerant as shown by the dotted arrow. Then, the high-temperature, high-pressure refrigerant gas from the compressor (18), that is, hot gas, splits into two parts via the four-way valve (19) and accumulator (30), one directly to the evaporator (11) and the other non-return. Through the valve (33) into the hopper cooling coil (4),
A heat radiating action is generated in each, and the cooling cylinder (8) and the hopper (2) are heated at a specified sterilization temperature for a predetermined time. After radiating heat, the liquefied refrigerant merges through the hot gas cylinder valve (34) and hot gas hopper valve (35), respectively, and is separated into gas and liquid by the water-cooled condenser (20). A heating cycle is formed through (36) and the reverse capillary tube (37), through the four-way valve (19) and back to the compressor (18).
(38) is a sterilization cold-keeping sensor that detects the heating temperature of the cooling cylinder (8), which has set temperature values of the upper limit and lower limit of a predetermined range predetermined to maintain the specified sterilization temperature for the mix. ON / OFF control the hot gas cylinder valve (34) and the compressor (18). The hopper sensor (32) is also used for heating control of the hopper (2), and the hot gas hopper valve (35) and the compressor (18) are turned on and off at the same set temperature value set in the cooling cylinder (8).
It is designed to be controlled. In addition, the sterilization / cooling sensor (38) described above shifts to cooling after heat sterilization,
ON / OFF control of the compressor (18) and cooling cylinder valve (24), cooling hopper valve (26) so as to maintain a certain low temperature state until the time of sale on the next day, that is, a cool temperature (+ 8 ° C to + 10 ° C) ON / OFF control of.

The cooling cylinder (8) has a supercooling sensor (40).
(See FIG. 5 (e)) is also provided to detect an abnormally low temperature, and its function will be described later. (41) is a water-saving valve, and during the heating cycle, at the end of the heating cycle, due to the reduction of the heating load (cooling cylinder, hopper), the refrigerant gas returns at a high temperature and flows into the compressor (18) for overload operation. Gas pressure sensor (42) that detects the refrigerant gas pressure in the water-cooled condenser (20) to prevent
When the specified gas pressure value is exceeded, the gas pressure sensor (42) opens the water-saving valve (41), the water flows through the water supply channel (43) as shown by the one-dot chain arrow, and the high temperature refrigerant gas radiates heat to the compressor. Adjust the suction pressure. (44) is an electrical box, and (45) is a front drain receiver. See also (46)
Is a water tap, which is supplied during mix cleaning.

FIG. 2 shows a refrigerant circuit diagram relating to this device equipped with two cooling cylinders (8A) and (8B), and is the same as that of the type A (vanilla soft cream) and type B (chocolate soft cream) frozen desserts. A and B are attached to the same components as the same numbers shown in FIG. 1 (a).

By the way, the freezer door (1
As shown in FIG. 1 (b), the operation panel (50) is arranged at the upper position of 4), and the operation panel (50) is located at the third position.
As shown in the figure, two sets of switches and indicators having the same function are arranged on the left and right around the sterilization switch (51) and the sterilization monitor display (52). That is, each set is an operation unit corresponding to a type A frozen dessert and a type B frozen dessert. Here, each switch will be described. When the cooling operation switch (53) is pressed, the cooling temperature of the cooling cylinder and the hopper is controlled to be within a predetermined set temperature range to manufacture a frozen dessert. (54) is an energy-saving cooling operation switch, which is pressed in a time zone in which the customer's feet are far away, and cooling control is performed at a set value temperature with a slight shift up of the cooling temperature for economical operation. (55) is a defrost switch, which is pressed when softening the mix for the recovery of the miken from the cooling cylinder or when softening the softened ice cream because it has not been sold for a long time. To raise the temperature of the cooling cylinder to a certain temperature. In this case, the temperature rises higher during recovery than during softening and regeneration. (56) is a washing switch, and when it is pressed, the beater (10) is driven to rotate for a predetermined limit time. When collecting the mix after defrosting or after collecting the mix, the water tap is used to cool the hopper and cool. It is operated when washing with water filled in the cylinder. Note that when the defrost switch (55) is pressed while the cleaning switch (56) is being pressed during mix collection, the defrost is started, the mix in the cooling cylinder is softened, and then the cleaning switch (56) is pressed again. The beater is rotated and discharged. On the other hand, when softening the mix, the defrost switch (5
When 5) is pressed, it is used so that the softening of the mix automatically shifts to recooling. (51) is a sterilization switch that is pressed at the end of the day's business to enter the heat gas sterilization process of the cooling cylinder and hopper by hot gas. When heat-sterilizing the mix, there is a stipulation that the heating temperature is + 68 ° C for 30 minutes or longer, and in order to satisfy that, in this example, the temperature is 70 ° C or higher for about 30 minutes, and the sterilization process is started. Sterilization monitor lamps L ₀ , L ₁ , L ₂ , L ₃ , L ₄ (hereinafter abbreviated as sterilization 0 to ₄ LEDs) are provided, which are sequentially switched from 0 stage to 4 stages when sterilization is completed. 4LED L ₄ is a sterilization completion lamp. (57) is a stop switch that stops all control operations (cooling, defrosting, cleaning, sterilization). (58) is a mix replenishment lamp, which lights up when the mix is not in contact with the mix level sensor (7) in the hopper (2) and informs the user of replenishment of the mix. Reference numeral (59) is an abnormality alarm lamp, which blinks or lights up when various abnormal situations occur in addition to the above-described mix exhaustion (in this case, blinking and indication of disinfection preparation failure). The same applies to each switch and each display lamp on the right side. And the abnormal contents reported by the abnormal alarm lamp (59) include water cutoff, beater motor overload relay (OLR) operation, supercooling, softening alarm,
There are sterilization preparation failure, cold insulation failure, power failure, sterilization failure, sensor failure, etc., but these are arranged inside the front lower plate (1a) of the device body (1) as shown in FIG. A separate operation panel (60) is provided for each device 7
Codes are displayed on the segment display (61). The code display content is sent and displayed by the changeover switch (62). Reference numeral (63) is a reset button for the beater motor (12), and reference numeral (64) is a shake / soft changeover switch. (75) and (76) are temperature adjustment volumes corresponding to shake and software.

FIG. 5 (a) shows a configuration diagram of a system control device mounted on the soft ice cream maker according to the present embodiment. The system control devices are arranged on the left and right when viewed from the front of the soft ice cream maker. There are two in total, one for each of the cooling cylinders (8A), (8B), but only one of them is shown in the figure for the control device of the right system, and the others are omitted. And this one control device is configured on the control board (70A),
One controller is also configured on the other control board (70B). Details of the system control device include cylinder sensor (31), hopper sensor (32), supercooling sensor (4
0), the signal from the sterilization / cooling sensor (38), and the signal from the current sensor (71) that detects the compressor motor current and the current sensor (72) that detects the beater motor current are passed through the amplification circuit (73) .... AD converter (74)
In addition to the input signal to the A / D converter (74), the output signal from the soft adjusting volume (75) for adjusting and adjusting the cooling temperature of the cooling cylinder to suit the soft ice cream production and the ice In the case of cream shake production, the output signal from the shake adjusting volume (76) for setting and adjusting the cooling temperature suitable for the cream shake is also input and A-D converted. Where the supercooling sensor (40)
Regarding mix, if the mix is not replenished near the end of business hours and if the mix contained in the freezing cylinder is kept on sale, the mix in the cooling cylinder gradually decreases and the cooling load (mix) decreases. And a supercooled state occurs. Then, the evaporator is cooled to a predetermined temperature, so that the supercooling sensor (40) performs a detection operation and controls to enter the defrost. After defrosting, if the mix is not added, it will be overcooled again, and if the number of times of supercooling is two, it has a safety protection function that stops all operations. The current sensor (71) related to the compressor follows the suction pressure of the compressor. That is, when the end of the heating cycle is reached, heat exchange in the cooling cylinder decreases, the heat returns to high-temperature, high-pressure gas, and the compressor becomes overloaded. The increase in the current value is detected, the reverse valve (36) is closed, and the flow rate of the circulating refrigerant is adjusted to reduce the load. Then, the current sensor (72) related to the beater motor detects the beater motor current that changes depending on the hardness of the mix due to cooling, and when it becomes too hard to cool, only cooling stops and stirring continues, and the frozen dessert reaches the set temperature. When this happens, the stirring operation is stopped to reduce the load when the beater motor restarts. A CPU (central processing unit) (77) executes processing according to the converted digital signal by an AD converter (74). On the other hand, CPU (7
7) through the buffer (78), the mix cut signal,
Water cutoff signal, compressor overload signal, beater motor overload signal, type A frozen dessert extraction signal, type B frozen dessert extraction signal are mixed level sensor (electrode) (7), mix out detection circuit (79), water cutoff switch (80). ), Compressor overload relay (OLR) switch (81), beater motor overload relay (OLR) switch (82), extraction SW ₁
Input with (83) and Extraction SW ₂ (84). Further, the buffer (78) receives the power frequency signal from the power frequency detection circuit (85).
Further, the key input from each operation switch of the operation panel (50) is also input via the input to the CPU (77).

Therefore, the CPU (77) executes processing according to the digital signal from the AD converter (74) and the signal from the buffer (78), and outputs a device drive stop command, a display signal and the like. That is, for the device drive stop command, a control command is output from the CPU (77) via the buffer (86), and the relays RY ₁ , RY ₂ , R
_{Y 3, RY 4, RY 5} , RY 6, RY 7, RY 8, RY 9 operates and its operation contact Ry
(B) of ₁ , Ry ₂ , Ry ₃ , Ry ₄ , Ry ₅ , Ry ₆ , Ry ₇ , Ry ₈ , Ry ₉
Compressor motor CM (18M), beater motor BM (12), mix stirring motor KM (6), cooling cylinder valve FS (24), cooling hopper valve FH (26), hot gas cylinder valve HS (34) , Hot gas hopper valve FH
(35), four-way valve QV (19) and reverse valve RV (36) are drive-controlled. Then, the progress status of sterilization, mix shortage, device abnormality alarm, etc. are lit or blinked on the display LED (87), and the content of the abnormality is displayed on the 7-segment display (61). Further, the information processed and executed by the CPU (77) is bidirectionally communicated with the other board (70B), that is, the system controller of the type B frozen dessert, through the transmission line (88).

As described above, the soft ice cream manufacturing apparatus according to the present embodiment has the apparatus configuration and the control circuit configuration shown in FIGS. 1 to 5, and the actual condition of the operating condition will be described in detail below.

(I) Cooling operation or energy-saving cooling operation (I) -1 Normal cooling operation By pressing the cooling operation switch (53), the normal refrigeration cycle, that is, the cooling cylinder (8) is cooled by the cylinder sensor (31) to the lower limit temperature ( Compressor (18) so that the hopper (2) is cooled by the hopper sensor (32) within the temperature range of + 8 ° C to + 10 ° C. , ON / OFF control of the cooling cylinder valve (24), the cooling hopper valve (26) and the beater motor (12). As a result, soft ice cream is produced in the cooling cylinder (8) and extracted every time it is sold.

(I) -2 Cooling control correction operation In this cooling operation (non-sale state), even if the lower limit setting temperature is too low or appropriate, cooling continues, and the lower limit setting is made even after a predetermined limit time (15 minutes) has passed. If it is not cooled to the value temperature, the set temperature is shifted up a little, and this shift temperature set value is used as a new correction set temperature for cooling operation control,
If not satisfied, shift up again, and automatically shift stepwise to a predetermined limit set temperature (0 ° C),
Prevents deterioration of soft serve ice cream due to overcooling,
Also, reduce the load and operating rate of the compressor (18) to protect it.

On the other hand, when a predetermined time (1 hour) has elapsed after the initial set value temperature was corrected to the shift temperature set value, the set value shift is canceled and the shift temperature set value is returned to the initial set value temperature. This can prevent insufficient cooling.

(I) -3 Cooling operation by energy saving If the user selects the energy saving operation switch (54) during night hours or during other hours when customers are far away, the set temperature is shifted up from that during the normal refrigeration cycle, and Cooling operation control is performed based on the set temperature value (energy-saving cooling operation) (I) -4 Cooling operation at the beginning of sales After heat sterilization at the end of business on the previous day, a fixed number (40 pieces) of software at the beginning of sales on the next day Until cream sales
Shift down the set temperature (set value -0.2 ° C) to control cooling. This allows the mix at the cold storage temperature to be cooled to a lower temperature than that of the fresh mix after heat sterilization, and a good soft ice cream with no stickiness can be taken out from the beginning of sales. That is, it becomes possible to provide a frozen dessert having excellent shape-retaining properties as well as a frozen dessert produced by cooling and stirring a fresh mix and extending the keeping time.

(II) Sterilization / cooling operation (II) -1 Sterilization operation When the sterilization switch (51) is pressed, it starts under the condition that the mix does not run out, and the four-way valve (19) switches from the refrigeration cycle to the heating cycle. Hot gas is supplied to the cooling cylinder (8) and the hopper (2) for heat sterilization. +70 for both cooling cylinder (8) and hopper (2)
Compressor (18), hot gas cylinder valve (34) by the functions of sterilization, cold insulation sensor (38) and hopper sensor (32) so as to satisfy the total heating time of about 40 minutes in the heating temperature range of ℃ to +72 ℃ , Hot gas hopper valve (3
5) is ON / OFF controlled. The process of heat sterilization is 0-4
Displayed by LED, 0 LED blinks at the start, and when the temperature of the cooling cylinder (8) reaches + 72 ° C, 1 LED blinks, and 0 LED switches from blinking to lighting. 1LED keeps blinking while heating time of + 70 ℃ or more continues for 13 minutes, and 1L after 13 minutes
The ED switches to lighting and the 2 LED blinks. Every 13 minutes thereafter
Following the blinking of 3LED and 4LED, the stipulated heating state was carried out for about 40 minutes (actually 13 minutes x 3 = 39 minutes) at the time of blinking of 4LED, which means that the sterilization operation is completed and the cold preservation operation is started. That is, 4L
The blinking ED indicates that the cold storage operation has started.

(II) -2 Cooling operation In the cooling operation following the sterilization operation, a predetermined time (90
The temperature of the cooling cylinder (8) and the hopper (2) are kept within a temperature range of + 8 ° C to + 10 ° C under the condition that the temperature falls below a predetermined temperature (+ 13 ° C) within a minute).
8) and hopper sensor (32) are compressor motor (18M), cooling cylinder valve (24), cooling hopper valve (2)
6) ON / OFF control.

(III) Cleaning operation The cleaning switch (56) is pressed to operate when the store is closed. The beater motor (12) is turned on for a predetermined period of time, the take-out lever is opened, and the mix is collected (discharged). Further, after the collection, the hopper (2) and the cooling cylinder (8) are supplied with water by the water supply plug (46) and washed with stirring by the beater (10).

(IV) Defrost (mix softening action) operation (IV) -1 Defrost during mix recovery In order to facilitate mix recovery during cleaning operation, the cooling cylinder (8) is heated to a predetermined temperature (+ 5 ° C) with hot gas. And soften the mix. It operates by pressing the defrost switch (55), and heating control is performed by the sterilization / cold sensor (38) O of the hot gas cylinder valve (34).
It is made by N, OFF control.

(IV) -2 Defrost during cooling (energy saving) operation When the defrost switch (55) is pressed during cooling operation, it operates and warms the cooling cylinder (8) with hot gas to bring the mix to the specified temperature (+ 0 ° C). After that, the cooling operation is continuously performed, and the mix is cooled to the set temperature again. Similarly, for the heating control, the sterilization / cooling sensor (38) controls ON / OFF of the hot gas cylinder valve (34).

 In addition to the above operation, there is a required protective operation.

(V) Four-way valve protection operation Four-way valve (1
9) To prevent liquid sealing and chattering noise in the refrigerant line that occurs during switching, immediately after the switching, a predetermined time (30 seconds) cooling cylinder valve (24), cooling hopper valve (26), HG cylinder valve (3
4) Open the HG hopper valve (35).

(VI) Beater motor overcurrent protection When an overload condition occurs due to a frozen dessert that has hardened due to overcooling, the current sensor (72) determines the load condition by detecting the current value of the beater motor,
When the current value exceeds the set value of 4.7A), stop cooling only (compressor motor (18M) OFF) and continue stirring operation. When the stirring resistance of the frozen dessert in the cooling cylinder (8) becomes less than the set value of 4.2A, recooling (compressor motor (18M) ON) is performed and the cylinder sensor (31) reaches the set temperature or cools. It continues until the set time elapses from the start. This avoids the disadvantage of the beater motor falling into an overload situation.

(VII) Compressor operation protection during heat sterilization (reverse valve control) As the compressor load increases in the latter stage of heating, the reverse valve (36) adjusts (reduces) the amount of gas sucked into the compressor to operate the compressor. Reduce the load. Therefore, the compressor motor current is detected by the current sensor (71), and the reverse valve (36) is detected when the value is 5.3A or more.
Is turned off, and the reverse valve (36) is turned on when the specified value is 3.5 A or less.

The above operations (I) to (VI) are executed under the system controller of FIG. 5, and the flow of the overall processing operation is performed according to the main flowchart of FIG. FIGS. 7 (a) and 7 (b) show a flowchart of the cooling / energy-saving operation, and FIG. 8 shows a time chart of equipment related to the operation. Similarly, FIG. 9 (a),
(B) is a flowchart of the sterilization operation, FIG. 10 is a flowchart of the cool operation, and FIG. 11 is a time chart of the equipment related to both operations. Hereinafter, FIG. 12 shows a flow chart of the cleaning operation, FIG. 13 shows a flow chart of the defrost operation operation, and FIG. 14 shows a time chart of equipment related to the operation. The flowcharts in FIGS. 15, 16, and 17 relate to protection during operation of the four-way valve, beater motor overcurrent protection, and control of the reverse valve, respectively.

First, a description will be given according to the main flowchart of FIG. Determine whether the stop switch (57) has been pressed (10
1) If YES, reset all operation flags and stop all operations (102). If NO, the operation switch (5
3) Or it is judged whether the energy saving switch (54) is pressed (103), and if YES, look at the sterilization operation flag (10
4) If the sterilization operation flag is NO, the operation / energy saving operation flag is set, and other operation flags are reset (105). If the sterilization operation flag is set and the sterilization operation is being performed, the operation / energy saving operation flag is not set. If the judgment (103) is NO, the sterilization switch (5
It is judged whether or not 1) was pressed (106), if YES, it is judged whether or not the mix is out (107), and if it is not NO, the sterilization operation flag is set and other operation flags are reset. Yes (108). If YES is out of mix,
A sterilization preparation failure display is output (109) and the sterilization operation flag is not set. The indication of the sterilization preparation failure is made to blink on the abnormality alarm display lamp (59), and the 7-segment display (61) can display a code. Judgment (10
If 6) is NO, it is judged whether the cleaning switch (56) has been pressed (110), and if YES, the sterilization operation flag is checked (11).
1) If the sterilization operation flag is NO for reset, the cleaning operation flag is set and the other operation flags are reset (112). If the sterilization operation flag is set and the sterilization operation is being performed, the cleaning operation flag is not set. Judgment (110) is N
If it is O, it is judged whether or not the defrost switch (55) is pressed (113), and if it is YES, the sterilization operation flag is checked (11
4) If the sterilization operation flag is NO for reset, look at the cooling / energy saving operation flag or the cleaning operation flag (115), and if either flag is set, set the defrost operation flag (116).

Thus, each operation flag is set by operating each switch. Each operation is executed by the set flag. That is, look at the cooling / energy saving operation flag (11
7) If the flag is set, cooling / energy saving operation is performed (118), and if reset, the cooling / energy saving operation is stopped. Looking at the sterilization operation flag (119), if the flag is set, the sterilization operation is performed (120), and if it is reset, the sterilization operation is stopped. Next, look at the cool operation flag (12
1), when the flag is set, the cool operation is performed (12
2) When it is reset, the cold insulation operation stops.

Next, looking at the cleaning operation flag (123), if the flag is set, the cleaning operation is performed (124), and if it is reset, the cleaning operation is stopped. Looking at the defrost operation flag (125), if the flag is set, the defrost operation is performed (126), and if it is reset, the defrost operation is stopped. After each operation is executed, a four-way valve protection operation (127), a beater motor overcurrent protection operation (128), and a reverse valve control operation (129) are executed.

In the main flowchart described above, according to the operation flow shown in the judgment (107) and the processing (109), even if the sterilization switch (51) is pressed, the judgment (107) detects whether or not the mix is out, When the mix runs out, sterilization is not performed. At the same time, a warning lamp (59) informs the user of the disinfection preparation failure.

As a result, conventionally, the heat sterilization is operated with or without the mix, and a small amount of the mix M in the hopper (2) is foamed, resulting in a mix containing extra air, resulting in a short supply of the mix. The drawback of quality deterioration is prevented in advance. As a concrete means, a mix level detection sensor (7) consisting of a pair of energizing electrodes is set at a predetermined height position from the inner bottom surface in the hopper (2), and when the mix is sufficient as shown in FIG. The mix level detection sensor (7) is in a conductive state via the mix M, and when the liquid level of the mix becomes lower than the position of the sensor (7), the conductive state is interrupted as shown in FIG. Based on the detection signal, the sterilization process is not operated and sterilization preparation failure is displayed.

The processing procedure of the cooling / energy saving operation operation described above is performed according to the flowchart shown in FIG. 7, and the operation timing of the related equipment at that time is as shown in FIG.

It is judged whether or not the defrost switch (55) is pressed during the cooling / energy saving operation (201), and if pressed, a flag is set and the defrost operation is started. If it is not pressed, it is judged whether or not the supercooling defrost flag is set (202),
If it is not set, it is judged whether or not the supercooling sensor (40) is below -20 ° C (203), and if it is below -20 ° C, it is judged whether or not the number of times of supercooling is 2 times (204). If it is 2 times or less, the number of supercooling is counted up (205) and the supercooling defrost flag is set (206).

That is, when the temperature of the supercooling sensor becomes lower than −20 ° C. in the judgment (203), a flag is set and the process enters the defrosting mode. Then, after defrosting at the time of supercooling, recooling is performed, and the number of times of supercooling becomes two again according to the supercooling. In this case, all the operation flags are reset by the determination (204), and all the operations are stopped ( 207). If the determination (203) is NO, it is next determined whether or not there is a set value shift flag (208). Here, the set value shift flag means that the cylinder sensor (31) has not reached the set value and the cooling cylinder valve (24) is ON continuously.
After a lapse of minutes, the set value shift flag is set, and the temperature of the cylinder sensor (31) at that time is set as the set value. Therefore, if the determination (208) is YES, a process (209) of setting the temperature of the cylinder sensor (31) when 30 minutes has passed as a set value is performed. Therefore, judgment (208) and processing (209)
The setting value selection is executed by and.

If the set value shift flag has not been generated, it is determined whether the operation is the cooling operation or the energy saving operation (210), and the cooling operation is performed when the cooling switch is pressed, and the energy saving operation is performed when the energy saving switch is pressed. And in each case of cooling and energy saving,
Judge whether it is software setting value or shake setting value (211) (212)
Then, when the changeover switch (64) is on the soft side, it becomes the soft ice cream temperature set value (213) (214), and when it is on the shake side, it becomes the shake temperature set value (215) (216). next,
It is determined whether or not there is a flag set after the sterilization, that is, a post-sterilization flag (217), and it is determined whether or not the number of sales up to the present after the sterilization is over 40 (21).
8) Until the value is exceeded, the set value is -0.2 ° C lower than the set value (219). If it exceeds 40, reset the post-sterilization flag (2
20), Use normal setting values. Please note that this sales volume
At the start of energy saving operation, each extraction lever (16A), (16B),
It is designed to be counted by the operation of the take-out switch linked to (16C).

In this way, the set temperature of the mix after sterilization is lowered to quickly eliminate the stickiness of the mix accompanying the heat sterilization process. That is, by shifting down the set temperature, the freezing rate of the frozen dessert is increased, so that it becomes possible to provide a frozen dessert excellent in shape retention and shape retention time like the new mix. Next, it is judged whether the cooling cylinder valve (24) is ON (221), and further judgment (222).
In (223), when the cylinder sensor (31) detects a temperature above the set value and above + 0.5 ° C, the cooling cylinder valve (24) is turned on (224) to cool the cylinder. Execute the operation and turn on the compressor motor (18M). During cooling, the beater motor delay timer is cleared (225) and the beater motor is turned on (226). On the other hand, if the judgment (222) (223) detects that the cylinder sensor (31) has a temperature below the set value or below + 0.5 ° C with respect to the set value, the cooling cylinder valve (24) is turned off (227) and cooling is performed. Stop. When the cooling cylinder valve is turned off (cooling stopped), the number of supercools is cleared (228), and depending on whether it is soft or shake (229), the delay operation of the beater motor is 5 seconds for soft and 30 seconds for shake. The beater motor delay timer to be decided is started, and in the case of software, it is judged whether 5 seconds have passed (230), the beater motor is turned on until 5 seconds have passed (231), and when it has passed, it is turned off (232). Similarly, in the case of shaking, it is determined whether or not 30 seconds have passed (233), the beater motor is turned on (231) until 30 seconds have passed, and turned off (232) when the time has passed. Therefore, it starts with judgment (221), and each process (226) (231) (2
The flow up to 32) is the ON / OFF control of the cooling cylinder valve (24) and the beater motor (12). The flow starting from the next judgment (234) to the processing (238) (239) relates to the ON / OFF control of the cooling hopper valve (26).

First, when the cooling cylinder valve is ON at YES in the judgment (234), the process (239) for turning off the cooling hopper valve is executed without fail. That is, the cooling operation of the cooling cylinder valve (24) is preferentially performed. If the cooling cylinder valve is OFF, NO,
Judgment (235) and judgment (236) (237) turn on the cooling hopper valve (26) at 10 ° C or higher (238) and turn it off at 8 ° C or lower (239), perform valve opening / closing control, and operate the hopper ( Cool 2). And when the cooling hopper valve (26) is ON,
The compressor motor (18M) also turns on. Next judgment (24
The flow starting from 0) is related to the processing of the set temperature shift by monitoring the cooling time, and based on the processing result, the cooling temperature set value of the determination (208) and the processing (209) is selected.

Therefore, first, it is judged whether or not the cooling cylinder valve (24) is ON (240), and if it is ON, the cooling monitoring timer is activated, and if it is OFF, the cooling monitoring timer is cleared (24
1). The cooling monitoring timer sets the shift sensor temperature as the shift temperature set value if the cooling operation continues for 30 minutes and the cylinder sensor temperature at that time is 0 ° C or less.
It is a timer that stops cooling. Therefore judgment (242)
If 15 minutes has passed and the determination (243) determines that the temperature is 0 ° C. or less, the set value shift flag is set (244), and the cylinder sensor temperature is changed to the shift temperature set value (245)
To clear the cooling monitoring timer (246).
If the cylinder sensor temperature at that time is equal to or higher than 0 ° C. according to the judgment (243), a cylinder sensor abnormality is output and all operations are stopped (247). As a result, if the set temperature does not reach the set temperature even after continuous cooling for a certain period of time or more, the set temperature is set to the sensor temperature at that time to settle the cooling stop situation. Prevents waste even if cooling continues.

Then, when the set value shift flag is set and the set value is corrected to the shift temperature set value, it is determined whether or not the set value shift flag is present (248), and if YES, the set value shift release timer operates. If NO, clear the release timer (252). When the release timer has passed the predetermined time (1 hour) by the determination (249), the set value shift flag is reset (250) and the release timer is cleared (251). When the set value flag is reset in this way, the above determinations (208), (210), (211) are then performed.
Then, the processing (213) is performed and the set value is returned to the original value. As a result, the operation at the shift temperature set value is not continued forever, and insufficient cooling of the soft serve ice cream can be prevented.

As described above, the cooling monitoring timer and the release timer control the operation of the refrigerating device at the optimum set value for maintaining the quality of the soft serve ice cream in good condition.

The processing procedure of the sterilization operation is performed according to the flowchart shown in FIG. 9, and the operation timing of the related equipment at that time is as shown in FIG.

The beater motor (12) operates continuously during sterilization. And the four-way valve (19) also operates continuously. Therefore, under the execution of the beater motor ON and the four-way valve ON (301), the sterilization monitoring timer determines whether or not the elapsed time after the start of sterilization is 2 hours (302). There is a possibility that the heating will change the quality of the mix, so set a time limit. Therefore, after the elapse of 2 hours, a sterilization failure alarm is output (303), and after the elapse of the time, the sterilization operation flag is reset, the cool operation flag is set (304), and the operation shifts to the cool operation. Judgment (302)
If the answer is NO, it is judged whether the HG cylinder valve (34) is ON (305), and if the sterilization / cold sensor temperature is 72 ° C or higher, the H / G cylinder valve is judged by judgment (306) (307). Set to OFF (3
08), the valve is turned on when the temperature is 70 ° C or less (309). Then, when the HG cylinder valve (34) is ON, the compressor motor (18M) is also ON. Next, the HG hopper valve (35)
It is judged whether or not it is ON (310), and if it is judged (311), (312) that the hopper sensor temperature is 72 ° C or higher, the HG hopper valve is turned OFF (313), and if it is 70 ° C or less, the valve is turned ON. And (31
Four). Then, when the HG hopper valve (35) is ON, the compressor motor (18M) is also ON.

Using a sterilization step counter, the sterilization process was performed as
Divide into divisions, and represent the progress of each by numbers. Therefore, at the beginning of heating, the HG cylinder valve (3
4) and HG hopper valve (35) are turned on and the temperature starts to rise. Initially, since the sterilization step counter is not "4", the determination (315) is NO, and since the step counter has not reached "1", the determination (316) is NO and the determination (317).
(318) with HG cylinder valve (34), HG hopper valve (35)
Unless both are turned off, that is, until the sterilization / cooling sensor (38) and the hopper sensor (32) reach 72 ° C, the sterilization step counter is judged to be “0” (319), and the sterilization 0 LED is blinked. , Turn off the sterilization 1-4 LEDs (320). In other words, when the temperature reaches 72 ° C., the sterilization step counter is counted up (321) and the sterilization step counter becomes “1”. If the judgment (316) is YES, the sterilization / cooling sensor and the hopper sensor are 70 ° C.
It is judged whether or not it is above (322) (323), and if both are above 70 ° C, it is judged whether or not the duration time has passed 13 minutes (324), and if not, the sterilization timer (325), it is determined that the sterilization step counter is still “1” (326), and 0 sterilization LED lighting, 1 sterilization LED flashing, and 2-4 sterilization extinguishing lights (327) are continued. Here, the sterilization timer (13 minutes integration timer) integrates the timer when the sterilization / cooling sensor and the hopper sensor are 70 ° C or higher, and stops the timer integration when the temperature is lower than 70 ° C. Judgment (32
When 13 minutes have passed in 4), the sterilization step counter is incremented to "2" (328) and the sterilization timer is cleared (329). When it is judged that the sterilization step counter is "2" (330), the sterilization 0,1 LED is turned on, the sterilization 2 LED is blinked, and the sterilization 3,4 LED is turned off (331). Similarly, the judgment (332) and the processes (333) and (334) are carried out to step up every 13 minutes, and the sterilization 3LED and the sterilization 4LED are blinked.
Therefore, when the sterilization step counter becomes "4", the sterilization process is completed, which means that sterilization 0 to 3 LED: lighting, sterilization 4LE
D: It is displayed blinking. When the self sterilization process ends in the judgment (315), a process (335) of setting a self sterilization end flag and transferring to another board (70B) by communication is performed. On the other hand, the heat sterilization process of the other cooling cylinder (8B) and hopper (2B) is also performed. When the other sterilization process is completed, the sterilization completion flag is set from the other board (70B) and sent by communication. Is coming. Therefore, it is judged whether or not the sterilization completion flag is sent from the other board (336).
Then, when the sterilization process of the self substrate and the sterilization process of the other substrate are completed and sent, the process (304) of resetting the sterilization operation flag and setting the cold insulation operation flag is performed. In this way, the sterilization operation is completed, and the operation becomes a cold preservation operation.

Here, the flow of the process (335), the judgment (336), and the process (304) has the following advantages. That is, in the case of the two cooling cylinders (8A) and (8B), the central extraction lever (15C) is connected to both the cylinders (8A) and (8B) through the extraction path (17
C), (17C) (see FIG. 2). Therefore, if the operation and stop of the sterilization process of each cooling cylinder (8A) and (8B) are controlled independently, if one is in the heat sterilization and the other is in the cooling operation, the central plunger (15) will cool. Under the influence of the cooled mix on the heating side, there is a possibility that a portion that does not reach the sterilization temperature is generated on the heating side, resulting in poor sterilization. By communicating the sterilization process status of each other with each other, confirming that both sterilization processes have been completed, the sterilization operation flag is reset for the first time, that is, both sterilization operations are stopped. And complete sterilization is possible.

The processing procedure of the cool keeping operation is performed according to the flowchart of FIG.

It is judged (401) (402) whether or not the temperature is 13 ° C or higher by the sterilization / cooling sensor or the hopper sensor.
It is judged whether or not minutes have elapsed (403), and when it has elapsed, a cold insulation defect display is output (404). After the sterilization process is completed, the refrigeration cycle is switched to cooling (pull-down), but if there is no abnormality in the cooling operation, it is considered that it will reach 13 ° C in about 90 minutes, and it is judged whether there is a defective cold insulation. Therefore, if the sterilization / cold sensor and hopper sensor become lower than 13 ℃ within 90 minutes, the security monitoring timer is cleared (40
Five). That is, the operation of judging whether the cold insulation is defective is performed by the security monitoring timer.

Next, it is determined whether or not the cooling cylinder valve is ON (406), and when the sterilization / cooling sensor is 10 ° C. or higher by the determinations (407) and (408), the cooling cylinder valve and the beater motor are turned ON (409) (410). . When the temperature is lower than 8 ° C., the cooling cylinder valve and the beater motor are turned off (411) and (412). And when the cooling cylinder valve is ON, the compressor motor is also ON
To do. That is, ON / OFF control of the cooling cylinder valve is performed. Then, it is judged whether or not the cooling hopper valve is ON (413), and when the judgment (414) (415) shows that the hopper sensor is 10 ° C. or higher, the cooling hopper valve is turned ON (416). When the temperature is below 8 ° C, it is turned off (417). When the cooling hopper valve is ON, the compressor motor also turns ON. That is, ON / OFF control of the cooling hopper valve is performed. Next, in judgment (418), it is checked whether or not there is a self-substrate cooling end flag, and judgment (419) is made.
At (420), when the cooling cylinder valve is turned off and the self-sterilization end flag is set, the self-substrate cold insulation flag is set. When the self-cooling completion flag is set, a process (412) of transferring to the other substrate by communication is performed. Then, in the judgment (422), it is checked whether or not the cold insulation completion flag is sent from the other board (70B) by communication, and if it is also sent from the other board (70B), the post-sterilization flag is set (423 ), All LEDs 0-4 are turned on (424). Therefore, the flow starting from the judgment (418) is the same as the communication method related to the sterilization end judgment described above, and is an operation flow related to the cold insulation end judgment and mutual communication.

Next, the processing procedure of the defrost operation is performed according to the flowchart of FIG. 13, and the operation timing of the related equipment at that time is shown in FIG. 14 (a) in the case of cooling defrost, and in FIG. 14 in the case of cleaning defrost. This is as shown in (b). When the defrost operation is started, the HG cylinder valve is turned ON (506) until the elapsed time of the defrost timer is determined (501) and (502) for 1 minute within 5 minutes, and the defrost operation is forcibly started. When 5 minutes have passed, the HG cylinder valve (34) is turned off (507), the defrost operation flag is forcibly reset (508), and the defrost is completed.
After 1 minute of defrost, the judgment (503) for defrost during cooling / energy-saving operation is based on the judgment (504). When the sterilization / cooling sensor is 0 ° C, the HG cylinder valve (34) is turned off (507). Reset the defrost operation flag ((5
08), finish the defrost. As a result, the mix temperature rises to near 0 ° C, and the mix freezing that occurs in the continuous cooling condition is prevented by pressing the defrost switch (55) and the cooling operation switch (53) at any time, and softens to a good quality mix. Is played.

Similarly, after one minute of defrosting, if the cleaning is performed in the judgment (503), the processing (507) and (508) are executed when the sterilization / cooling sensor is at 5 ° C. in the judgment (505) and the defrosting is ended. In this case, the mixture is heated to a mix temperature higher than the defrost temperature at the time of cooling, and is set in a more sufficiently softened state to facilitate the collection of the mix from the freezing cylinder. In addition, H.
When the G cylinder valve (35) turns on, the compressor motor (18M) also turns on.

The processing procedure of the cleaning operation is performed according to the flowchart of FIG.

It is determined whether the cleaning timer has elapsed for 3 minutes (60
1) Turn on the beater motor until it elapses (602), 3
After a lapse of minutes, the beater motor is turned off (603), the cleaning operation flag is reset (604), and the cleaning is completed. The protection operation during the four-way valve operation is performed according to the flowchart of FIG.

This device is equipped with a number of solenoid valves (for cooling gas and hot gas), check valve, and four-way valve, and the four-way valve (19) switches the heat medium flow path in the refrigeration cycle during cooling and heat sterilization. Are doing. At the time of this switching, liquid sealing and chatter noise are generated between the solenoid valve and the check valve. In order to prevent this, at the time of switching, all solenoid valves are opened for a predetermined time so that the pressure in the pipe can be equalized.

Therefore, determine whether it is a cooling operation or a sterilization operation (70
1) Turn off the four-way valve during cooling operation (702). Turn on the cooling cylinder valve (24) and cooling hopper valve (26),
Turn off the HG cylinder valve (34) and HG hopper valve (35) (703). At the time of the sterilization operation, the four-way valve is turned on (704).
In addition, install a cooling cylinder valve (24) and a cooling hopper valve (36).
Turn off and turn on the HG cylinder valve (34) and HG hopper valve (35).
N (705). When the four-way valve (19) is turned on by judgment (706) and judgment (707), the four-way valve rising flag is set (708) and the four-way valve falling flag is reset (70
9) Clear the 4-way valve delay timer (710). Next, it is judged whether the four-way valve is ON (706), and the four-way valve rising flag is set, so the judgment (707) becomes YES, and the judgment (71
1) until the four-way valve delay timer reaches 30 seconds,
That is, all valves are turned on for 30 seconds (712). Similarly, when switching to sterilization cooling and the four-way valve (19) is turned off, the four-way valve rising flag is reset (714) and the four-way valve falling flag is set (71) at judgments (706) (713).
5) Clear the 4-way valve delay timer (716). As a result, the four-way valve is judged to be OFF (706), and the four-way valve falling flag is set, so the judgment (713) is YES, and the judgment (711) turns all valves ON for 30 seconds.
2). That is, by controlling the four-way valve delay timer, immediately after the four-way valve (19) is turned on or off, the cooling cylinder valve (24), the cooling hopper valve (26), the HG cylinder valve (34), and the HG hopper valve. Turn on (35) for 30 seconds.

Next, the operation of the beater motor overcurrent protection is performed according to the flowchart of FIG.

Determine if the beater motor (12) is ON (801), N
If it is O, reset the beater motor overcurrent flag (8
09). If YES, it is determined whether the beater motor overcurrent flag is set (802). Judgment (803) (804)
When the beater motor current is 4.7A or more, set the flag (805) and turn off the compressor motor (18M) (8
06). When the beater motor current is 4.2A or less, the flag is reset (807) and the compressor motor (18M) is turned on (808). This is a method that simply detects the overload state based on the magnitude of the beater motor current value that depends on the degree of freezing of the mix and controls its ON / OFF, when restarting immediately after detecting the overload. Since the blade tries to scrape off the hard cream adhering to the inner wall of the cooling cylinder, the beater motor (12) is overloaded again, but this flow only cools it when overcurrent is detected. Then, the beater motor (12) continues stirring, and when cooling is stopped, the stirring operation is stopped after the temperature becomes uniform, and the compressor motor (18M) is turned on again to recool. In this way, it is possible to obtain the effect of protecting the driving parts by reducing the load at the time of starting, the stable quality of the frozen dessert evenly heated, and the effect of preventing the overload condition.

The control operation of the reverse valve (36) is performed according to the flowchart of FIG. It is confirmed by the judgment (901) that it is a heating cycle, it is judged whether or not the compressor motor overcurrent flag is present (902), and the judgment (903) (904) sets the flag when the compressor motor current is 5.3 A or more ( 905), reverse valve (36) is turned off (906). When the compressor motor current is 3.5 A or less, the flag is reset (907) and the reverse valve (36) is turned on (908). Thus, although the compressor has been adversely affected by the input of high-temperature gas to the compressor at the end of the conventional overheat sterilization, the circulation flow rate can be reduced stepwise by closing the reverse valve, and the compressor can be protected.

(G) Effect of the Invention The present invention monitors the cooling operation time, corrects the set temperature when cooling continues for a predetermined limit time or longer, and stops the cooling operation of the refrigeration apparatus by the corrected set temperature. Therefore, continuous cooling operation is prevented, quality deterioration of the soft serve is prevented, and a soft serve having an appropriate viscosity can be provided. At the same time, there is an advantage that unnecessary operation of the refrigeration system is suppressed and the durability of the system is improved.

Also, once the refrigeration system is operated for a predetermined time at the corrected set temperature, it is possible to prevent the viscosity of the soft serve ice from decreasing due to insufficient cooling by returning to the original set temperature again. It is possible to prevent the soft serve ice cream from being settled due to hardening or excessive stirring.

As described above, according to the present invention, the operation of the refrigerating apparatus can be controlled at the optimum set temperature, so that it is possible to always provide the soft serve ice cream of good quality.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanation of a soft ice cream manufacturing apparatus showing an embodiment of the present invention, FIG. 1 (a) is a schematic side view of its internal structure, and FIG. 1 (b) is its front view. FIG. 2 is an explanatory view of a heat medium piping path configuration during cooling and heat sterilization according to the soft ice cream manufacturing apparatus of the present invention configured to include two cooling cylinders and a hopper, and FIG. 3 is soft ice. Explanatory drawing of the display operation panel arranged on the front of the cream manufacturing device,
FIG. 4 is an explanatory view of another display operation panel arranged inside the front plate behind the manufacturing apparatus, and FIG. 5 shows one system unit of a control unit of the soft ice cream manufacturing apparatus of FIG.
6A is a control circuit configuration diagram, FIG. 6B is an operation circuit diagram of each drive component to be drive-controlled, FIG. 6 is a main flowchart showing the entire processing operation by the control unit, FIG. 7 (a) and 7 (b) are flowcharts showing processing operations relating to the cooling / energy saving operation, FIG. 8 is a time chart of the cooling / energy saving operation, and FIGS. 9 (a) and 9 (a).
(B) is a flowchart showing a processing operation relating to the sterilization operation, FIG. 10 is a flowchart showing a processing operation relating to the cold insulation operation, FIG. 11 is a time relating to the sterilization / cool insulation operation shown in FIG. 9 and FIG. Chart, FIG. 12 is a flow chart showing the processing operation relating to the cleaning operation, FIG. 13 is a flow chart showing the processing operation relating to the defrosting operation, and FIG. 14 is a time chart of the defrosting operation. Time chart for defrost, same figure (b) is for defrost at the time of cleaning, Figure 15 is a flow chart showing the processing operation related to protection operation at the time of four-way valve operation, and Figure 16 is for beater motor overcurrent. FIG. 17 is a flowchart showing the processing operation related to the protection operation, FIG. 17 is a flowchart showing the processing operation related to the control operation of the reverse valve, and FIG. That soft ice cream product temperature and the cooling operation time and stirrer (beater) is an explanatory view illustrating a relationship between the motor input and the cooling operation time. (2) …… Hopper, (8)… Cooling cylinder, (11)
…… Evaporator, (18) …… Compressor, (31) …… Cylinder sensor, (77) …… Microcomputer.

Claims (1)

(57) [Claims] 1. A cooling operation control device for a frozen dessert manufacturing apparatus, comprising: a cooling cylinder for cooling and stirring a mix supplied from a hopper to produce a frozen dessert; and a refrigerating device for cooling the cooling cylinder to a predetermined set temperature. A cooling monitor timer for monitoring the continuous cooling operation time, a means for correcting the set temperature when a predetermined time elapses by the cooling monitor timer, and a start when the set temperature is corrected by the means, and a correction after the predetermined time elapses. A cooling operation of the frozen dessert manufacturing apparatus, comprising: a release timer for returning the set temperature to the set temperature before correction and means for controlling the operation of the refrigerating device based on the set temperature before or after the correction. Control device.