JPH03191751A - Production device of chilled confectionaries - Google Patents

Abstract

PURPOSE:To prevent liquid sealing and to eliminate chattering sound of solenoid valves caused by the change of pressure by opening for a given time such of the solenoid valves in piping paths, circulating a liquefied refrigerant and a hot gas, when switching the freezing cycle and the hot gas cycle through a four-way valve. CONSTITUTION:When the switching between a freezing cycle and a hot gas cycle is carried out by a four-way valve 19, a cooling cylinder valve 24, a cooling hopper valve 26, a HG cylinder valve 34 and a HG hopper valve 35, which control the circulation of each liquefied refrigerant and high-temperature refrigerant gas responding to a hopper 2 receiving cooling action and heating action and a cooling cylinder 8, are opened for a given time.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to an apparatus for manufacturing frozen desserts such as soft ice cream, and in particular, to an apparatus for manufacturing frozen desserts such as soft ice cream, and in particular, a refrigeration apparatus capable of switching between a freezing cycle and a hot gas cycle using valve means. , frozen dessert production and cleaning,
The present invention relates to a frozen dessert manufacturing apparatus that is compatible with sterilization and is suitable for preventing vibration noise, liquid sealing phenomenon, etc. occurring in a refrigerant circuit during switching.

(b) Conventional technology As disclosed in Japanese Utility Model Publication No. 63-20304, this type of equipment is equipped with a refrigeration system consisting of a compressor, a condenser, a throttle, and a cooler installed in a cylinder and a mix tank. The refrigeration cycle is reversible using a four-way valve, and when manufacturing frozen desserts, liquefied refrigerant flows through the cooler to cool the cylinder and mix tank, and when sterilizing and cleaning mixes and equipment, high-temperature refrigerant gas (hot gas) from the compressor is cooled. There is one that heats cylinders and mix tanks by radiating heat through a cooler and making the cooler act as a heater.

(c) Problems to be Solved by the Invention However, in a refrigeration system having this reversible refrigeration cycle configuration, the refrigeration cycle circuit includes the four-way valve, each electromagnetic valve for refrigerant gas and hot gas distribution, and a non-return valve. Valve etc.
Many valves are interposed. Therefore, there are problems such as a liquid seal occurring between the solenoid valve and the check valve when switching the four-way valve, and chattering noise of the valve due to sudden pressure changes.

A liquid seal impairs the cycle switching response, and frequent valve chatter noises are not only undesirable as they lead to valve failures and are unpleasant to the ears.

The present invention has been made in view of the above points, and is a frozen dessert manufacturing apparatus capable of smoothly switching between a refrigeration cycle and a hot gas cycle, extending the life of a valve device, and performing a switching operation without noise. The purpose is to provide

(d) Means for Solving the Problem In a frozen dessert manufacturing apparatus in which a mix stored in a hopper is supplied into a cooling cylinder, and soft ice cream, etc. produced in the cooling cylinder is taken out by a takeout device, a compressor is used. , a condenser, and a four-way switching valve formed in a refrigeration system consisting of a cooler attached to the hopper and the cooling cylinder, respectively, and the hopper and the cooling cylinder receive cooling and heating effects by the four-way switching valve For the cylinder,
A cooling solenoid valve and a heating solenoid valve are provided for controlling the flow of liquefied refrigerant and high-temperature refrigerant gas, respectively, and means is provided for opening all of the solenoid valves for a certain period of time when the four-way valve is switched.

(e) Function When switching between the refrigeration cycle and the hot gas cycle is performed using a four-way valve, all solenoid valves in the piping paths through which liquefied refrigerant and hot gas flow are opened for a predetermined period of time to prevent liquid sealing. This eliminates chattering noise caused by solenoid valves due to pressure changes.

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

FIG. 1(a) is a schematic side view of the internal configuration of a soft serve ice cream manufacturing apparatus according to an embodiment of the present invention, FIG. 1(b) is a front view of the soft serve ice cream manufacturing apparatus, and FIG. 2 is a refrigerant circuit diagram. Two types of soft-serve ice cream, for example, vanilla soft-serve ice cream and chocolate soft-serve ice cream, are manufactured in the same apparatus, and therefore two sets of apparatus configurations shown in the same figure (, ) are provided. There are three types of soft serve ice cream that can be sold: vanilla soft serve ice cream, chocolate soft serve ice cream, and mixed soft serve ice cream that is a mixture of these.

First, in the same figure (a), l is the main body of the device, 2 is the frozen dessert (
The hopper is used to store the so-called mix, which is a raw material for soft serve ice cream, and has a hopper cover 3 that is removed when replenishing the mix, and the mix is kept cold by a hopper cooling coil 4 wound around the hopper 2. Further, an impeller 5 provided at the inner bottom is rotated by an impeller motor 6 to stir the mix to prevent it from freezing. The impeller 5 is also driven to rotate when a predetermined amount or more of the mix is put into the hopper 2 and the mixture is heated and sterilized by the refrigerant gas, that is, hot gas, which flows through the hopper cooling coil 4 in the opposite direction to the cooling operation. 7 is a mix level sensor that detects whether there is more than a predetermined amount of mix in the hopper 2, and it consists of a pair of conductive electrodes. The flow of hot gas is stopped and the impeller 5 is not rotated so as not to perform the heat sterilization process described later. 8 is supplied to hopper 2 by mix feeder 9
This is a cooling cylinder for producing frozen desserts by rotating and stirring the mix appropriately supplied from a beater IO, and an evaporator 11 is arranged around the cooling cylinder. The beater 10 is rotated via a beater motor 12, a drive transmission belt, a reduction gear 13, and a rotating shaft. The manufactured frozen desserts.

When a take-out lever 15 arranged on the freezer door 14 is operated, the plunger 16 moves up and down, opening the extraction passage 17 and taking out the freezer. Here, this device is provided with three take-out levers, as shown in FIG. 3(b).

That is, the left take-out lever 15A is for vanilla, the right take-out lever 15B is for chocolate, and the center take-out lever 15C is for a mix of vanilla and chocolate. For this purpose, as shown in FIG.
Another cooling cylinder 8A is provided for manufacturing vanilla soft serve ice cream, and another cooling cylinder 88 is for producing chocolate soft serve ice cream.
5A and the cooling cylinder 8A communicate with each other via the extraction path 17A, and the extraction lever 15B and the cooling cylinder 8B communicate with each other via the extraction path 17A.
Vanilla and chocolate are extracted in a one-to-one correspondence with communication between them via the extraction channel 17B, while extraction levers ] and 5C are connected to the extraction channels 17C and 17C.
By communicating with both cooling cylinders 8A and 8B via the cooling cylinders 8A and 8B, it is possible to extract mixed soft serve ice cream. Incidentally, when taking out the frozen dessert, each of the beaters 1 and 0 (the other is not shown) rotates and also serves to deliver the frozen dessert.

Next, a refrigeration system for cooling the hopper 2 and the cooling cylinder 8 will be explained. 18 is a compressor, 19 is a compressor that uses the discharged refrigerant from the compressor I8 during the refrigeration cycle (
20 is a water-cooled condenser; 20 is a water-cooled condenser;
The high-temperature, high-pressure refrigerant gas flowing through the check valve 21 is condensed and liquefied to form a liquefied refrigerant. When the liquefied refrigerant exits the dryer 23 through the check valve 22, it is divided into two parts, one of which is the cooling cylinder valve 24 and the other is the cooling cylinder capillary tube 2.
5 into the evaporator 11, where it is evaporated and vaporized to cool the cooling cylinder 8. The other part flows into the hopper cooling coil 4 via the cooling hopper valve 26 and the capillary tube 27 for the hopper in the previous stage, where it similarly evaporates and cools the hopper 2, and then exits through the capillary tube 28 in the latter stage. go. After cooling the cooling cylinder 8 and the hopper 2, the refrigerant gas joins the accumulator 30 and then passes through the four-way valve 19 to the compressor 18.
A refrigeration cycle is formed that returns to , and a cooling operation is performed in which the refrigerant flows in the direction of the solid line. By the way, in this cooling operation, in order to obtain high-quality frozen desserts, the cooling cylinder 8 and hopper 2 are kept within a predetermined set temperature range (cooling cylinder; approximately -3
It is necessary to maintain cooling at 5°C to -8°C, hopper: 5°C to 10°C. Therefore, a cylinder sensor 31 is provided to detect the temperature of the cooling cylinder 8, and this sensor 31 detects the temperature of the cooling cylinder valve 24 at a preset upper limit temperature.
ON (open), the compressor 18 is turned ON to perform cooling, and the cooling cylinder valve 24 is closed (OF
F), perform cooling operation control by turning off the compressor 18. Similarly, for hopper 2, hopper 2
A hopper sensor 32 is provided to detect the temperature of the cooling water, and the cooling water is heated at preset upper and lower temperature limits.
The valve 26 is opened and closed, and the compressor 18 is turned on and off. However, the control is such that priority is given to cooling the cooling cylinder 8, and the cooling hopper valve 2G is turned ON under the condition that the cooling cylinder valve 24 is OFF.

After sales have been completed under the cooling operation described above, the mix will be sterilized by heating when the store is closed. In this case, the refrigeration system is switched from a refrigeration cycle to a heating cycle. That is, the four-way valve 19 is operated to flow the refrigerant in the direction of the dotted arrow.

Then, the high-temperature, high-pressure refrigerant gas, that is, the hot gas, from the compressor 18 passes through the four-way valve I9 and the accumulator 30 and is divided into two parts, one of which is directly sent to the evaporator 11, and the other is sent to the hopper cooling coil via the check valve 33. The cooling cylinder 8 and the hopper 2 are heated at a specified sterilization temperature for a predetermined period of time. After heat dissipation, the liquefied refrigerant is transferred to the hot gas cylinder valve 3.
4. After merging through the hot gas hopper valve 35, gas and liquid are separated in the water-cooled condenser 20, and the refrigerant gas passes through a reverse solenoid valve 36 and a reverse capillary tube 37 installed in parallel, and then passes through a four-way valve 19 to the compressor 18. and back to form a heating cycle. 38 is the cooling cylinder 8
The hot gas cylinder valve 34 and the compressor 18 are activated by the sterilization/cold storage sensor that detects the heating temperature of the mix at the upper and lower set temperature values of a predetermined range to maintain the specified sterilization temperature for the mix. ON, OFF
Control. The hopper sensor 32 is also used to control the heating of the hopper 2, and the ON/OFF control of the hot gas hopper valve 35 and the compressor 18 is performed at the same set temperature value set for the cooling cylinder 8. In addition, the above-mentioned sterilization/cold storage sensor 38
After heat sterilization, the product is cooled down to a low temperature that lasts until the next day's sales, i.e., at a cold storage temperature (+8℃ to +10℃).
Turn on the compressor 18 to maintain the
Performs OFF control and ON/OFF control of the cooling cylinder valve 24 and cooling water valve valve 26.

Note that the cooling cylinder 8 is also provided with a supercooling sensor 40 (see FIG. 5(a)) for detecting abnormally low temperatures, the function of which will be described later. 41 is a water saving valve, which is used to prevent overload operation caused by the refrigerant gas returning in a high temperature state and flowing into the compressor 18 due to a reduction in the heating load (cooling cylinder, hopper) at the end of the heating cycle. It is equipped with a gas pressure sensor 42 that detects the refrigerant gas pressure inside the water-cooled condenser 20, and when the gas pressure exceeds a predetermined value, the water saving valve 4 is activated by the gas pressure sensor 42.
1 is opened, water flows through the water supply channel 43 as shown by the dashed-dotted line arrow, and the high temperature refrigerant gas radiates heat to adjust the compressor suction pressure. 44 is an electrical box, and 45 is a front drain receiver. Further, 46 is a water supply faucet, which is supplied with water during mix cleaning.

Figure 2 shows a refrigerant circuit diagram of this device equipped with two cooling cylinders 8^ and 8B.
In accordance with the frozen desserts of type B and B (chocolate soft-serve ice cream), major identical components are designated with A and B, respectively, in addition to the same numbers shown in FIG. 1(a).

By the way, as shown in FIG. 1(b), an operation panel 50 is arranged above the freezer door 14 on the front side of the main body 1, and the operation panel 50 has a sterilization switch 51 as shown in FIG. Two sets of switches and indicators with the same function are arranged on the left and right sides of the sterilization monitor display 52. That is, each set is an operation section corresponding to A type of frozen dessert and B type of frozen dessert.

Here, each switch will be explained. 53 is a cooling operation switch which, when pressed, controls the cooling temperature of the cooling cylinder and hopper to a predetermined set temperature range to produce frozen desserts. Reference numeral 54 denotes an energy-saving cooling operation switch, which is operated to suppress the operation during times when there are fewer customers, and controls the cooling at a set temperature that is slightly shifted up to achieve economical operation. 55 is a defrost switch, which is pressed when collecting the mix from the cooling cylinder by softening it and taking it out, or when regenerating soft serve ice cream that has become soft because it is not sold for a long time.At that time, hot gas is flowed to cool it. Raise the temperature of the cylinder to a certain level. In this case, the temperature rises higher during recovery than during softening and regeneration. Reference numeral 56 is a cleaning switch, and when pressed, the beater 10 is driven to rotate for a predetermined time limit. Operated when flushing with filled water. In addition, when collecting the mix, if the defrost switch 55 is pressed while the cleaning switch 56 is pressed, the defrost is entered and the mix in the cooling cylinder is softened, and then the beater is rotated by pressing the cleaning switch 55 again. is discharged. On the other hand, when the defrost switch 55 is pressed while the cooling operation switch 53 is being pressed during the softening and regeneration of the mix, the mix is used in such a way that it automatically shifts from softening to re-cooling. Reference numeral 51 is a sterilization switch, which is pressed at the end of a day's work to begin the heating sterilization process of the cooling cylinder and hopper using hot gas. When heat sterilizing the mix, there is a regulation that the heating temperature should be +68℃ for at least 30 minutes.
In order to satisfy this requirement, in this example, the sterilization process was carried out at a temperature of 70°C or higher for about 30 minutes, and the sterilization process started at 0.
Sterilization monitor lamp L, t t,, ILx-L3- that blinks sequentially in four stages from stage to completion of sterilization
L* (hereinafter abbreviated as sterilization θ~4 LED) is provided.

Sterilization 4 LED L4 is a sterilization completion lamp. 5
7 is a stop switch that stops all control operations (cooling, defrosting, cleaning, sterilization). Reference numeral 58 denotes a mix replenishment lamp, which lights up when there is a shortage of mix in the hopper 2 described above, such as not touching the mix level sensor 7, and notifies the user that the mix is to be replenished. Reference numeral 59 denotes an abnormality alarm lamp, which flashes or lights up when various abnormal situations occur, in addition to the above-mentioned mix being out (in this case, it flashes to indicate that sterilization is not ready). The same applies to each switch and each indicator lamp on the right side. The abnormalities reported by the abnormality alarm lamp 59 include water outage, beater motor overload relay (OLR) operation, overcooling, softening alarm, poor sterilization preparation, poor cooling insulation, power outage, poor sterilization, and defective sensors. However, these are the front lower plate 1 of the device main body 1.
When a is removed, codes are displayed on a seven-segment display 61 provided corresponding to each device on another operation panel 60 shown in FIG. 4 disposed inside the a. The contents of the code display are forwarded and displayed using the changeover switch 62. 63 is a reset button for the beater motor 12;
4 is a shake/soft changeover switch. 75.
76 is a temperature adjustment volume corresponding to shake and soft.

FIG. 5(a) shows a configuration diagram of the system control device installed in the soft ice cream manufacturing device of this embodiment, and this system control device is arranged on the left and right when viewed from the front of the soft ice cream manufacturing device. cooling cylinder 8A
There are two in total, one each corresponding to , 8B, and in the figure one of them is shown on the right.

Only the stem control lit is shown, and the others are omitted. And this one control device is the control board 70A.
The other control device is also connected to another control board 70B.
It is composed of In detail, the system control device is a current sensor 71 that detects signals from the cylinder sensor 31, hopper sensor 32, supercooling sensor 40, sterilization/cooling sensor 38, and compressor motor current.
A signal from a current sensor 72 that detects the beater motor current is sent to an A-D converter 74 via an amplification circuit 73 .
In addition, this ^-D converter 74 receives an output signal from a soft adjustment volume 75 that sets and adjusts the cooling temperature of the cooling cylinder to suit the production of soft ice cream, and an output signal for the production of ice cream shakes. In case of A
-D converted. Here, regarding the supercooling sensor 40, if the mix is not replenished near the end of business,
If we continue to sell only the mix contained in the freezing cylinder, the mix in the cooling cylinder will gradually decrease.
The cooling load (mix) decreases and a supercooled state occurs. Then, the temperature of the evaporator drops to a predetermined temperature, so that the supercooling sensor 40 detects the temperature and controls the defrost mode. After defrosting, if no mix is added, it will become supercooled again and has a safety protection function that will stop all operations if it is supercooled twice. Further, a current sensor 71 related to the compressor follows the suction pressure of the compressor. That is, at the end of the heating cycle, heat exchange in the cooling cylinder decreases and returns as high temperature, high pressure gas, resulting in compressor overload. This increase in current value is detected and the reverse valve 3G is closed to adjust the flow rate of circulating refrigerant to reduce the load. The current sensor 72 associated with the beater motor detects the beater motor current, which changes depending on the hardness of the mix due to cooling. If the mix becomes hard due to excessive cooling, only cooling will be stopped and stirring will continue, and the frozen dessert will reach the set temperature. It is involved in the function of stopping the stirring when the beater motor reaches this point, thereby reducing the load upon restarting the beater motor.

cpu (central processing unit) 77 is an A-D converter 74
Processing is executed according to the converted digital signal.

On the other hand, the mix level sensor (electrode) 7 receives a mix out signal, a water cutoff signal, a compressor overload signal, a beater motor overload signal, a type A frozen dessert extraction signal, and a type B frozen dessert extraction signal to the CPU 77 via a buffer 78. , mix break detection circuit 79, water cutoff switch 80, compressor overload relay (OLR) switch 81, beater motor overload relay (OLR) switch 82, and water cutoff switch 80.
Input by W183, extraction 5I11284.

Furthermore, a power supply frequency signal is input to the buffer 78 via a power supply frequency detection circuit 85, and key input from each operation switch on the operation panel 50 is inputted to the CPU 77.

Therefore, the CPU 77 executes processing according to the digital signal from the A-D converter 74 and the signal from the buffer 78, and outputs an instruction to stop driving the device, a display signal, etc.

That is, regarding a command to stop driving the equipment, a control command is output from the CPU 77 via the buffer 86, and a control command is sent to the relay RY.

RY, ,RY3. RY, ,RY, ,RYG,RY
, ,RY, ,RY, and its operation contact Ry IRyZ IRy31RY4 tRys rRYa r
RYt rRYa rRYa As shown in the same figure (b), compressor motor CM18M, beater motor BMI2, mix stirring motor KM6, cooling cylinder valve F, S24, cooling hopper valve F, H26, hot gas cylinder valve H, S34 , hot gas hopper valve F,)13
5. Driving and controlling the four-way valve QV19 and reverse valve RV36. Then, the sterilization progress status, mix out, abnormality alarm of the device, etc. are displayed on the display LED 87 by lighting or blinking, and the contents of the abnormality are displayed on the 7-segment display 61. Furthermore, the information being processed and executed by the CPU 77 is communicated with another board 70B, that is, the system control device for the 8 types of cold dishes, via a transmission line 88.

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

(1) Cooling operation or energy-saving cooling operation (1)-1 Normal cooling operation By pressing the cooling operation switch 53, the normal refrigeration cycle, that is, the cooling cylinder 8 is activated by the cylinder sensor 3.
1, the lower limit temperature (set value) and upper limit temperature (set value + 0.
The compressor 18, the cooling cylinder valve 24, the cooling water collar valve 26, and the beater motor 12 are configured so that the hopper 2 is cooled in the temperature range of +8°C to +10°C by the hopper sensor 32. ON, OFF
Control. Thereby, soft ice cream is produced in the cooling cylinder 8 and extracted each time it is sold.

(I)-2 Cooling control correction operation when cooling is insufficient In this cooling operation (sales condition), the lower limit set temperature is too low and cooling continues, even after the predetermined limit time (30 minutes) has passed. If the cooling is not achieved, the set temperature is slightly shifted up, and this shifted temperature set value is used as the new set temperature to control the cooling operation.If the temperature is not satisfied, the set temperature is shifted up again until the predetermined limit set temperature (0℃) is reached. The system automatically shifts in stages to prevent quality deterioration of the soft serve ice cream due to overcooling, and also to reduce the load and operating rate of the compressor 18 and protect it.

(1)-3 Energy-saving cooling operation When the user selects the energy-saving operation switch 54 during night business hours or other times when there are fewer customers, the set temperature is shifted up from the normal refrigeration cycle. Cooling operation control is performed based on the value (energy-saving cooling operation) (1)-4 Cooling operation at the beginning of sales After heat sterilization at the end of business the day before, at the beginning of sales the next day,
Cooling control is performed by shifting down the set temperature (set value -0.2°C) until a certain number (40) of soft serve ice creams are sold. This allows the mix, which has been heat sterilized and is at a cold storage temperature, to be cooled to a temperature lower than that of a fresh mix, making it possible to produce good-quality soft serve ice cream without stickiness from the beginning of sale.

(II) Sterilization/cold storage operation (n)-i 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, and the hot gas is cooled. It is supplied to the cylinder 8 and hopper 2 and is heat sterilized. Both cooling cylinder 8 and hopper 2 are sterilized within the heating temperature range of +70°C to +72°C for a total heating time of approximately 40 minutes.
Due to the functions of the cold storage sensor 38 and the hopper sensor 32, the compressor 18 and the hot gas cylinder valve 34
, the hot gas hopper valve 35 is controlled to be turned on and off. The heat sterilization process is displayed by sterilization O to 4 LEDs, 0 LED blinks at the start, and when the temperature of the cooling cylinder 8 reaches +72°C, ILED starts blinking, and 0 LED switches from blinking to lighting. Heating time above +70℃ is 1
The quantity ratio ED continues to flash for 3 minutes, and after 13 minutes, the ratio ED
is switched to lighting and 2 LEDs start blinking. More than 1m! 1
3 LED and 4 LED blink every 3 minutes, and when 4 LED blinks, it takes about 40 minutes (actually 13 minutes x 3 = 39 minutes)
The specified heating state has been achieved, the sterilization operation is completed, and the cooling operation is started. That is, the blinking of the 4 LEDs indicates that the cold storage operation has started.

(II)-2 Cold preservation operation In the cold preservation operation that follows the sterilization operation, the cooling cylinder 8 and hopper 2 are heated to +8℃ to +10℃ under the condition that the temperature falls below the predetermined temperature (+13℃) within the predetermined time (90 minutes). The sterilization/cold storage sensor 38 and the hopper sensor 32 are connected to the compressor motor 18M, so that the temperature is kept cool within the temperature range.
Turn on the cooling cylinder valve 24 and cooling hopper valve 26,
OFF control.

(m) Cleaning operation When the store is closed, the cleaning switch 56 is pressed and activated.

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). After collection, water is supplied to the hopper 2 and the cooling cylinder 8 through the water tap 46, and the beater 10 performs stirring and cleaning.

(rV) Defrost (mix softening action) operation (r
V)-1 In order to facilitate mix recovery during the defrost cleaning operation during mix recovery, the cooling cylinder 8 is heated to a predetermined temperature (+5° C.) with hot gas to soften the mix. It is activated by suppressing the defrost switch 55, and heating control is performed by controlling the hot gas cylinder valve 34 to turn on and off using the sterilization/cooling sensor 38.

(IV)-2 Defrost during cooling (energy saving) operation When the defrost switch 55 is pressed during cooling operation, the cooling cylinder 8 is heated with hot gas to raise the mix to a predetermined temperature (+0°C). Then, cooling operation continues to cool the mix to the set temperature again. Similarly, heating control is performed by turning on the hot gas cylinder valve 34 using the sterilization/cooling sensor 38.

OFF control is performed.

In addition to the above operations, there are other necessary protective operations.

(V) Protective operation of four-way valve The present invention is characterized by operation control in this case.

Four-way valve 19 related to cooling cycle←→heating cycle switching
Immediately after the switching, the cooling cylinder valve 24, cooling hopper valve 26, H, G cylinder valve 34, H
, G hopper valve 35 is opened.

(VI) Beater motor overcurrent protection When an overload condition occurs due to frozen desserts that have become hard due to overcooling, the current sensor 72 determines the load condition by detecting the beater motor current value, and the current sensor 72 detects the beater motor current value. When the value exceeds the set value of 4.7A, only cooling is stopped (compressor motor (18M) OFF) and stirring operation is continued. When the stirring resistance of the frozen dessert in the cooling cylinder 8 decreases to below the set value of 4.2A, recooling is performed (compressor motor (18M) is turned on), and the cylinder sensor 31
The cooling continues until the temperature reaches the set temperature or the set time elapses from the start of cooling. This avoids the inconvenience of the beater motor becoming overloaded.

(■) Compressor operation protection during heat sterilization (reverse valve control) As the heating load decreases in the latter stages of heating, the reverse valve 36 adjusts (reduces) the amount of gas sucked into the compressor to reduce the compressor operating load. do.

Therefore, the compressor motor current is detected by the current sensor 71.
is detected, and the reverse valve 36 is turned off at a predetermined value of 5.3 A or more.
F L, the reverse valve 36 is turned ON when the predetermined value is 3.5 A or less.

The operations (1) to (VI) above are executed under the system control device shown in FIG. 5, and the overall flow of processing operations is performed according to the main flowchart shown in FIG. 6. Further, 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, FIGS. 9(a) and 9(b) show a flowchart of the sterilization operation, FIG. 10 shows a flowchart of the cooling operation, and FIG. 11 shows a time chart of equipment related to the same operation. Below, Fig. 12 is a flowchart of the cleaning operation, and Fig. 13 is a flowchart of the cleaning operation.
The flowchart of the defrost operation is shown in the figure.
Figure 4 shows a time chart of equipment related to the same operation.

The flowcharts in FIGS. 15, 16, and 17 relate to four-way valve operation protection, beater motor overcurrent protection, and reverse valve control, respectively.

First, explanation will be given according to the main flowchart shown in FIG.

It is determined whether the stop switch 57 is pressed or not (101)
, if YES, all operation flags are set and all operations are stopped (102). If no, run switch 5
3 or the energy saving switch 54 is pressed (103), and if YES, check the sterilization operation flag (103).
4) If the sterilization operation flag is set to NO, set the operation/energy-saving operation flag and reset the other operation flags (105). Also, if the sterilization operation flag is set and the sterilization operation is in progress, set the operation/energy-saving operation flag. is not set. Then, if the determination (103) is NO, it is determined whether the sterilization switch 51 has been pressed (106), YE
If it is S, it is necessary to judge whether the mix is out or not (107), NO
If the mix is not out, the sterilization operation flag is set and the other operation flags are reset (ioa). YE
If S is out of mix, output an indication that sterilization is not ready.1
09), the sterilization operation flag is not set. It should be noted that this indication of unpreparedness for sterilization is flashed on the abnormality alarm display lamp 59, and a code can be displayed on the 7-segment display 61. If the judgment (106) is No, the cleaning switch 5
6 is pressed (110), if YES, check the sterilization operation flag (111), and if the sterilization operation flag is reset NO, set the cleaning operation flag and reset the other operation flags (110). 112). If the sterilization operation flag is set and the sterilization operation is in progress, the cleaning operation flag is not set. 6 If the determination (110) is NO, it is determined whether the defrost switch 55 has been pressed (113).

If YES, check the sterilization operation flag (114), and if the sterilization operation flag is reset (NO), check the cooling/energy saving operation flag or cleaning operation flag (115), and if either flag is set (YES) A defrost operation flag is set (116).

In this way, each operation flag is set by operating each switch. Each operation is executed according to this set flag. In other words, look at the cooling/energy saving operation flag (11
7) When the flag is set, the cooling/energy saving operation is performed (118), and when the flag is reset, the cooling/energy saving operation is stopped. The sterilization operation flag is checked (119), and when the flag is set, the sterilization operation is performed (120), and when the flag is reset, the sterilization operation is stopped.

Next, the cold preservation operation flag is checked (121), and if the flag is set, the cold preservation operation is performed (122), and if it is reset, the cold preservation operation is stopped.

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

In this main flowchart, the following advantages can be obtained in the operation flow shown in judgment (107) and processing (109). That is, even if the sterilization switch 51 is pressed,
In the judgment (107), it is detected whether the mix is out or not, and if the mix is out, the sterilization operation is not performed. At the same time, a warning lamp 59 indicates that the preparation for sterilization is insufficient.

As a result, conventionally, heat sterilization is performed regardless of the presence or absence of mix, and the small amount of mix M in the hopper 2 foams, resulting in a mix that contains excess air, resulting in a lack of mix supply and quality. The disadvantage of metamorphosis is prevented. Specifically, as shown in Fig. 1(a), a mix level detection sensor 7 consisting of a pair of current-carrying electrodes is set at a predetermined height position from the inner bottom surface of the hopper 2, and as shown in Fig. 1(a). When there is enough mix, the mix level detection sensor 7 is in a conductive state through the mix, and when the mix liquid level becomes lower than the position of the sensor 7, the conductive state is cut off, and based on the detection signal at that time, It is designed to indicate that the sterilization process is not working or that the sterilization preparation is inadequate.

The processing procedure for the cooling/energy-saving operation described above is performed according to the flowchart shown in FIG. 7, and the operation timings of the related equipment are as shown in FIG. 8.

It is determined whether or not the defrost switch 55 is pressed during the cooling/energy saving operation (201), and if it is pressed, a flag is set and defrost is entered. If it is not pressed, determine whether the supercooling defrost flag is set (202),
If it is not set, the supercooling sensor 40 will determine whether the temperature has fallen below -20°C 203), and if it is below -20°C, it will determine whether the number of supercoolings has been 2 or not 204), 2
If it is less than the number of times, count up the number of times of supercooling (205).
, sets a supercooling defrost flag (206).

In other words, in the judgment (203), the supercooling sensor is 120 degrees Celsius.
When the following conditions occur, set the flag and enter defrost.

Then, after defrosting during supercooling, if the number of times of supercooling is 2 when it is recooled and supercooled again, in that case, all operation flags are reset by judgment (204),
All operations are stopped (207). Judgment (203) is N
If o, then determine whether there is a set value shift flag (2
08). Here, the set value shift flag means that the cylinder sensor 31 does not reach the set value and the cooling cylinder valve 24 is turned ON.
When 30 minutes have passed continuously, a 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 (20g) is YES, a process (209) is performed in which the temperature of the cylinder sensor 31 after 30 minutes is set as the set value. Therefore, judgment (208) and processing (2
09), the setting value is selected.

If the set value shift flag is not generated, it is determined whether the cooling operation or the energy saving operation is to be performed (210). When the cooling switch is pressed, the cooling operation is performed, and when the energy saving switch is pressed, the energy saving operation is performed. In each case of cooling and energy saving,
Determine whether it is a soft setting value or a shake setting value (211) (
21, 2) L, , When the selector switch 64 is on the soft side, the soft cream temperature setting value becomes (213) (
214), and when it is on the shake side, it becomes the shake temperature set value (215) (216). Next, it is determined whether there is a flag that is set after sterilization, that is, a post-sterilization flag 217), and it is determined whether there is a flag and the number of units sold to date after sterilization has exceeded 40 (218). , the set value shall be -0.2℃ lower than the set value until it exceeds the set value (219
). If it exceeds 40, reset the flag after sterilization 220
), the normal setting value. Please note that this sales number is calculated at the start of cooling/energy-saving operation, each take-out/< -16A, 16B
, 16C is operated in conjunction with the eject switch.

In this way, the preset temperature of the mix after sterilization is lowered to quickly eliminate the sticky phenomenon of the mix that accompanies the heat sterilization process. Next, it is determined whether the cooling cylinder valve 24 is ON or not (221), and further determination is made (222) (223).
), when the cylinder sensor 31 detects a temperature higher than the set value and +0.5°C or higher relative to the set value, the cooling cylinder valve 24 is turned on (224), the cylinder cooling operation is executed, and the compressor Motor 1gM is also turned ON. During cooling, the beater motor delay timer is cleared (225) and the beater motor is turned on (226). On the other hand, in judgments (222) and (223), the cylinder sensor 31 is below the set value or +0 with respect to the set value.
．． When a temperature of 5°C or lower is detected, turn the cooling cylinder valve 24 to O.
FF Toshiki 227) and stop cooling.

When the cooling cylinder valve is turned OFF (cooling stopped), clear the number of supercooling L (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. Activate the beater motor delay timer that determines this, and in the case of software, determine whether 5 seconds have elapsed (230), keep the beater motor ON until 5 seconds have elapsed (231), and then turn 0F.
Let it be F (232). Similarly, in the case of shaking, it is necessary to judge whether 30 seconds have elapsed or not (233), turn the beater motor to 0N (231) until 30 seconds have elapsed, then turn it to 0FF (233).
32). Therefore, the flow starts from judgment (221) and ends with each process (226), (231), and (232).
It becomes FF control.

Starting from the next judgment (234), processing (238) (2
The flow leading to 39) is 0N10F of the cooling hopper valve 26.
This is related to F control.

First, the judgment (234) is YES if the cooling cylinder valve is ON.
In this case, the cooling hopper valve must be turned off (2)
39). That is, the cooling operation of the cooling cylinder valve 24 is performed with priority. Cooling cylinder valve is OFF
If NO, judgment 235 and judgment (236) (2
In step 37), the cooling water valve 26 is turned ON at temperatures above 10°C (238) and turned OFF at temperatures below 8°C (239), thereby performing valve opening/closing control to cool the hopper 2. When the cooling water valve 26 is ON, the compressor motor 18M
is also turned on. The flow starting from the next judgment (240) relates to processing for shifting the set temperature by monitoring the cooling time, and based on the processing results, the selection of the cooling temperature set value in the judgment (208) and processing (209) described above is made. Ru.

Therefore, first, it is determined whether the cooling cylinder valve 24 is ON or not (240), and if it is ON, the cooling monitoring timer is activated, and if it is OFF, the cooling monitoring timer is cleared (241), and the cooling monitoring timer is in the cooling operation. continues for 30 minutes, and the cylinder sensor temperature at that time is 0℃.
If it is below, the timer sets the sensor temperature at that point as the shift temperature set value and stops cooling. Therefore, 30 minutes have passed in judgment (242), and 0 in judgment (243).
If it is determined that the temperature is below 0.degree. C., a set value shift flag is set (244), the cylinder sensor temperature is changed to the shift temperature set value (245), and the cooling monitoring timer is cleared (246). Furthermore, if the cylinder sensor temperature at that time is 0° C. or higher, a cylinder sensor abnormality is output and all operations are stopped (247).

As a result, if the set temperature is not reached even after continuous cooling for a certain period of time, the set temperature will be set to the sensor temperature at that point and the situation will be settled to cooling stop.
It is possible to prevent unnecessary cooling from continuing indefinitely at a low set temperature.

The processing procedure for 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. 11.

During the sterilization operation, the beater motor 12 operates continuously. The four-way valve 19 also operates continuously. Therefore, the beater motor O
N. Under execution 301 of turning on the four-way valve, it is determined by the sterilization monitoring timer whether two hours have elapsed since the start of sterilization (302). The mix may change in quality due to heating, so set a time limit for heating. Therefore, after two hours have elapsed, a sterilization failure alarm is output (303), and after the time has elapsed, the sterilization operation flag is reset, the cold preservation operation flag is set (304), and the process shifts to the cold preservation operation. Judgment (3
If NO in 02), determine whether the H, G cylinder valve 34 is ON or not 305), and also determine (306) (307
), when the sterilization/cooling sensor temperature is 72℃ or higher, H,
The G cylinder valve is turned OFF (308), and the direction valve is turned ON when the temperature is below 70°C (309). When the H0G cylinder valve 34 is turned on, the compressor motor 18M is also turned on. Next, it is determined whether the H6G hopper valve 35 is ON or not (310), and when the hopper sensor temperature is 72°C or higher in the determinations 311 and 312, the H and G hopper valves are turned ON.
When the temperature is below 70°C, the control valve is turned on (314).

Then, when the I(, G hopper valve 35 is turned on), the compressor motor 18M is also turned on.

Using a sterilization step counter, the sterilization process is divided into 5 divisions of θ to 4, and the progress status of each is indicated numerically. Therefore, first, when starting heating, the H and G cylinder valves 3
4, H, and G hopper valves 35 begin to rise in temperature at ONL. At first, the sterilization step counter is not 4, so the judgment (315) is No, and since the step counter has not reached 1, the judgment (316) is No, and the 1 judgment (3
17) Unless both the H0G cylinder valve 34 and the H and G hopper valves 35 are turned OFF at (31g), that is, the sterilization/cold storage sensor 38 and the hopper sensor 32 are turned off.
It is determined that the sterilization step counter is 0 until the temperature reaches 72°C (319), and the sterilization 0 LED is blinked and the sterilization 1 to 4 LEDs are turned off (320), in other words, 72°C.
When it reaches 3, the sterilization step counter counts up (3).
21) is performed and the sterilization step counter becomes 1.

If the judgment (316) is YES, it is determined whether the sterilization/cold storage sensor and the hopper sensor are 70°C or higher (322) (323), and if both are 70°C or higher, the duration has exceeded 13 minutes. Please judge whether or not 324
), if the sterilization timer has not elapsed, add up the sterilization timer.
5) It is determined that the sterilization step counter is still 1 (326), the sterilization 0 LED is lit, the sterilization ratio ED is blinking,
Sterilization 2-4 LEDs turn off 327 continues. Here, the sterilization timer (13-minute integration timer) integrates the timer when the sterilization/cold storage sensor and hopper sensor are at 70°C or higher, and stops the timer integration when the temperature is lower than 70°C. Judgment 3
When 13 minutes have elapsed at 24, the sterilization step counter is incremented to 2 (328), and the sterilization timer is cleared (329). When it is determined that the sterilization step counter is 2 (330), sterilization is 0. ILED lights up, sterilization 2 LED blinks, sterilization 3.4 LED turns off (331)
. Thereafter, judgment (332) and processing (333) are carried out in the same manner (
334), step UP every 13 minutes, sterilization 3
1ED, transition to sterilized female ED blinking. Therefore, when the sterilization step counter reaches 4, the sterilization process is completed, which means that the sterilization 0 to 3 LEDs are lit, and the sterilization 4 LED is lit.
When the self-sterilization process is completed by the 0 judgment (315) displayed in blinking, a process 335 is performed in which a self-sterilization end flag is set and transferred to the other board 70B by communication. On the other hand, the heat sterilization process of the other cooling cylinder 8B and hopper 2B is also performed, and when the other sterilization process is completed, the sterilization completion flag is set and sent by communication from the other board 70B. Therefore, it is determined whether or not a sterilization end flag has been sent from another board (336) L.
When the sterilization process for the own substrate and the sterilization process for other substrates are completed, a sterilization operation flag is set, and a cooling operation flag is set (304). In this way, the sterilization operation is completed and the cooling operation begins.

Here, processing (335), judgment (336), processing (304)
) flow has the following advantages: That is, in the case of two cooling cylinders 8A and 8B, the central take-out lever 15
C is an extraction path 1 that communicates with both cylinders 8A and 8B.
7C and 17C (see Figure 2). Therefore each cooling cylinder 8A.

When the operation and stop of the sterilization process of 8B are controlled independently, when one side is in heat sterilization and the other is in cooling operation, the central plunger 15 is influenced by the cooled mix on the cooling side, There was a possibility that some parts of the heating side did not reach the sterilization temperature, resulting in poor sterilization. this,
By communicating the sterilization process status of each other, the sterilization operation flag is reset only after both sides confirm that the sterilization process has been completely completed. It enables sterilization.

The processing procedure for the cold preservation operation is performed according to the flowchart shown in FIG.

The sterilization/cold storage sensor or hopper sensor determines whether the temperature is 13°C or higher (401) (402), and 13
If the temperature is above 13°C, a security monitoring timer is activated, and it is determined whether the temperature has been above 13°C for 90 consecutive minutes (403).
When the time elapses, a cold insulation failure indication is output (404). After the sterilization process is complete, switch to the refrigeration cycle for cooling (pulldown)
However, if there is no abnormality in the cooling operation, the temperature will reach 13 in about 90 minutes.
It is assumed that the temperature will reach ℃ and determines whether or not there is a cooling defect. Therefore, if the sterilization/cold preservation sensor and hopper sensor become lower than 13° C. within 90 minutes, the safety monitoring timer is cleared (405), that is, the safety monitoring timer determines that the cold preservation is insufficient.

Next, determine whether the cooling cylinder valve is ON or not (406),
When the temperature of the sterilization/cold storage sensor is 10° C. or higher based on the judgment (407) (408), the cooling cylinder valve and the beater motor are turned on (409) (410). Also, when the temperature is below 8℃, the cooling cylinder valve and beater motor are turned off (411) (412), and the cooling cylinder valve is turned on.
At this time, the compressor motor is also turned on. That is, the cooling cylinder valve is controlled to be 0N10FF. Next, it is determined whether the cooling hopper valve is ON or not (413), and then (41)
4) When the temperature of the hopper sensor is 10° C. or higher according to (415), the cooling hopper valve is turned on (416). 8 again
When the temperature is below ℃, it is turned off (417). When the cooling water valve is turned on, the compressor motor is also turned on. That is, the cooling hopper valve is controlled to be 0N10FF.

Next, in judgment (418), it is checked whether or not there is a self-board cooling end flag, and in judgments (419) and (420), if the cooling cylinder valve is OFF L and the self-sterilization end flag is set, the self-board cooling end flag is set. Set the cold storage flag. Further, when the self-board cooling end flag is set, a process (421) of transferring the board to the other board via communication is performed. Then, in the judgment (422), it is checked whether or not the cold storage completion flag is sent from the other board 70B via communication, and if it is also sent from the other board 70B, the post-sterilization flag is set (423), and all the LED ~4 is turned on (424). Therefore judgment 418
The flow starting from is similar to the communication method related to the above-mentioned determination of completion of sterilization, and is an operation flow related to determination of completion of cold preservation and mutual communication.

Next, the processing procedure for the defrost operation is performed according to the flowchart shown in Figure 13, and the operation timing of the related equipment at that time is shown in Figure 14a for defrost during cooling, and as shown in Figure 14a for defrost during cleaning. As shown. When the defrost operation starts, the elapsed time of the defrost timer is judged (501) (502), and the H and G cylinder valves are kept ONL until 1 minute has elapsed within 5 minutes (506).
), force the defrost.

When five minutes have elapsed, the H and G cylinder valves 34 are turned off (507), the defrost operation flag is forcibly reset (508), and the defrost is ended. Defross 8
After 1 minute, it is determined (503) that defrosting during cooling/energy-saving operation turns off the H and G cylinder valves 34 when the sterilization/cold storage sensor is at 0°C based on determination (504).
At the same time as 507), the defrost operation flag is reset (508), and the defrost is finished. As a result, the mix temperature rises to nearly 0° C., and freezing of the mix that would occur under continued cooling is prevented by pressing the defrost switch 55 and the cooling operation switch 53 at any time, and the mix is softened and regenerated into a high-quality mix.

Similarly, after 1 minute of defrosting, if the judgment (503) is for cleaning, the sterilization/cooling sensor is set to 5°C by the judgment (505).
In this case, processes (507) and (508) are executed to end the defrost. In this case, the mix is heated to a temperature higher than the defrost temperature during cooling to achieve a more sufficient softened state, making it easier to recover the mix from the freezing cylinder.

Note that when the H and G cylinder valves 35 are turned on, the compressor motor 18M is also turned on.

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

It is determined whether the cleaning timer has elapsed for 3 minutes (601
), turn on the beater motor until it has elapsed (602).
, after 3 minutes, turn off the beater motor 603
), the cleaning operation flag is reset (604), and the cleaning ends.

According to the present invention, the protective operation during operation of the four-way valve is carried out according to the flowchart shown in FIG.

This device has many solenoid valves (for cooling gas and hot gas).
, a check valve, and a four-way valve are arranged, and the four-way valve 19 switches the heat medium flow path between the refrigeration cycle and the heating cycle during cooling and heat sterilization. During this switching, liquid sealing and chattering noise occur between the solenoid valve and the check valve. In order to prevent this, all solenoid valves are opened for a predetermined period of time at the time of switching so that the pressure in the piping can be equalized.

Therefore, it is determined whether it is a cooling operation or a sterilization operation (701).
, the four-way valve is turned off during the cooling operation (702).

Furthermore, the cooling cylinder valve 24 and the cooling water valve valve 26 are turned on.
Then, turn the H, G cylinder valve 34 and H, G hopper valve 35 to O.
Perform FF (703). When sterilizing, turn on the four-way valve.
(704), and further turns off the cooling cylinder valve 24 and the cooling hopper valve 36.
Turn on the G hopper valve 35 (705), judge (706)
), when the four-way valve 19 is ONL by judgment (707), set the four-way valve rise flag 708), reset the four-way valve fall flag 709), clear the four-way valve delay timer (710), and then Valve ON
Judgment (706) L, the four-way valve rising flag is set, so the judgment (707) is YES, and the judgment (707) is YES.
11) until the four-way valve delay timer elapses for 30 seconds, that is, all valves are turned on for 30 seconds (712
), sterilization → cooling is also switched, and the four-way valve 19 is turned off.
In this case, the four-way valve rising flag is reset (714), the four-way valve falling flag is set (715), and the four-way valve delay timer is cleared (716), thereby turning off the four-way valve. Judgment (706) L: Since the four-way valve fall flag has been set, the judgment (713) becomes YES, and all valves are turned on for 30 seconds based on the judgment (711) (712).

That is, by controlling the four-way valve delay timer, the four-way valve 19
Immediately after turning ONL or turning OFF L, the cooling cylinder valve 24, cooling hopper valve 26, H, G cylinder valve 34, and H, G hopper valve 35 are turned ON for 30 seconds.

Next, the beater motor overcurrent protection operation is performed according to the flowchart of FIG. 16.

To determine whether the beater motor 12 is ON or not (801),
If No, the beater motor overcurrent flag is reset (809); if YES, it is determined whether the beater motor overcurrent flag is set (802). Judgment (
803) (804) beater motor current is 4.7A
In this case, a flag is set (805) and the compressor motor 18M is turned off (806). When the beater motor current is less than 4゜2A, reset the flag.80
7) Turn on the compressor motor 18M (808
). If this is a method that simply detects an overload condition based on the large or small value of the beater motor current, which depends on the degree of freezing of the mix, and performs 0N10FF control, it will be necessary to cool down when restarting immediately after overload detection. Since the blade tries to scrape off the hard cream adhering to the inner wall of the cylinder, there was a drawback that an excessive load was applied to the beater motor 12 again, but due to this flow, when an overcurrent was detected,
Only the cooling is stopped, the beater motor 12 is allowed to continue stirring, and when the cooling is stopped and the temperature becomes uniform, the stirring operation is stopped, and the compressor motor 18M is turned on again to perform recooling. In this way, it is possible to protect the rotating parts by reducing the load at the time of start-up, to ensure stable quality of frozen desserts by uniformly temperatureizing them, and to prevent overload conditions.

The control operation of the reverse valve 36 is performed according to the flowchart shown in FIG. Determine that it is a heating cycle 90
1 to determine whether the compressor motor overcurrent flag is present (902), determine (903), set the flag when the compressor motor current is 5.38 or higher (904) (905), and turn off the reverse valve 36. (9
06). 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). As a result, the high temperature gas generated at the end of conventional superheat sterilization is input to the compressor,
By closing the reverse valve, the circulating flow rate, which used to have a negative impact on the compressor, can be reduced in stages to protect the compressor.

(G) Effects of the Invention As described above, according to the present invention, immediately after switching the four-way valve that switches between the refrigeration cycle and the hot gas cycle, all the various solenoid valves arranged in the piping are opened for a certain period of time. Since it is controlled in such a way that the pressure inside the piping is equalized, there is no chattering noise from liquid seals or valves. Therefore, it is possible to provide a frozen dessert manufacturing apparatus that can smoothly switch between the refrigeration cycle and the hot gas cycle, prevent valve failures, and operate quietly.

[Brief explanation of drawings]

Fig. 1 is an explanation of a soft ice cream manufacturing apparatus showing one embodiment of the present invention, in which Fig. 1(a) is a schematic side view of its internal configuration, Fig. 1(b) is its front view, and Fig. 2 shows two Fig. 3 is an explanatory diagram of the heat medium piping route configuration during cooling and heat sterilization in the soft ice cream manufacturing apparatus of the present invention, which is configured with a cooling cylinder and a hopper. An explanatory diagram of the display operation panel,
FIG. 4 is an explanatory diagram of another display operation panel arranged behind the front panel of the same manufacturing apparatus, and FIG. 5 shows one system section of the control section of the soft ice cream manufacturing apparatus of FIG.
Fig. 6(a) is a configuration diagram of its control circuit, Fig. 6(b) is an operating circuit diagram of each housing component to be driven and controlled, and Fig. 6 is a main flowchart showing the overall processing operation by the control unit. Figure 7 (a), (b) i;! A flowchart showing processing operations related to cooling/energy-saving operation, Fig. 8 is a time chart of the cooling/energy-saving operation, and Fig. 9 (
a) and (b) are flowcharts showing processing operations related to sterilization operations, Fig. 1O is a flowchart showing processing operations related to cold storage operations, and Fig. 11 is a flowchart showing processing operations related to sterilization/cold storage operations shown in Figs. 9 and 10. Related time charts, FIG. 12 are flowcharts showing processing operations related to cleaning operations, and FIG. 13 is a related time chart.
The figure is a flowchart showing processing operations related to defrost operation, and Figure 14 is a time chart of defrost operation, where (a) is a time chart for defrost during cooling, and (b) is a time chart for defrost during cleaning. Fig. 15 is a flowchart showing the processing operation related to the protection operation when the four-way valve is activated, Fig. 16 is a flowchart showing the processing operation related to the beater motor overcurrent protection operation, and Fig. 17 is the flowchart showing the processing operation related to the protection operation when the four-way valve is operated. 5 is a flowchart showing processing operations related to control operations. 2... Hopper, 4... Hopper cooling coil, 5...
...Impeller for mix stirring, 6...Impeller motor. 7...Mix detection means, 8...Cooling cylinder, l
O... Beater 111... Evaporator, I2... Beater motor, 15... Take-out lever, 16... Plunger, 17... Extraction path, 18... Compressor, 19... ...Four-way valve, 20...Water-cooled condenser, 2
4... Cooling cylinder valve, 26... Cooling hopper valve,
28...Late stage capillary tube, 31...Cylinder sensor, 32...Hopper sensor, 34...
・Hot gas (H, G) cylinder valve, 35... Hot gas (H, G) hopper valve, 36... Reverse valve, 3
8... Sterilization/cold storage sensor, 41... Water saving valve, 50
...Operation panel, 51...sterilization switch, 53...
・Cooling operation switch, 54...Energy saving operation switch,
55...Defrost switch, 56...Cleaning switch, 57...Stop switch, 58...Mix out lamp, 59...Abnormality alarm lamp, 61...7 segment display, ILED~4LED・...LED for sterilization monitor. Figure 1 (b) Figure 4 Figure 12 Figure 13 Figure (a) 4 Figure 5 (b) Figure 16 Figure 7

Claims (1)

[Claims] A frozen dessert manufacturing apparatus in which a mix stored in a hopper is supplied into a cooling cylinder, and soft ice cream, etc. produced in the cooling cylinder is taken out by a takeout device, which includes a compressor, a condenser, and a link between the hopper and the cooling cylinder. A refrigeration system consisting of a cooler, etc. attached to each of the hoppers is provided with a four-way switching valve that forms a hot gas cycle, and a four-way switching valve is provided for the hopper and the cooling cylinder, which receive a cooling action and a heating action by the four-way switching valve. A cooling solenoid valve and a heating solenoid valve are arranged to control the flow of liquefied refrigerant and high-temperature refrigerant gas, respectively.
A frozen dessert manufacturing apparatus characterized by comprising means for opening all of the solenoid valves for a certain period of time when switching the four-way valve.