JPH0719272Y2 - Frozen dessert making equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an apparatus for producing frozen desserts such as soft serve ice cream freezer.

[Conventional technology]

FIG. 4 shows a refrigerant circuit of a conventional soft serve ice freezer.

In FIG. 4, a compressor 1, a condenser 2, a first opening / closing valve 3, a first
The expansion device 4, the cylinder cooler 5, and the mix tank cooler 6 are connected in this order by refrigerant pipes.
A refrigerant in which a second opening / closing valve 7 and a second expansion device 8 are serially inserted in this order in parallel with the first opening / closing valve 3, the first expansion device 4 and the cylinder cooler 5. The pipe is connected. The first on-off valve 3 is open until the cylinder is sufficiently cooled by the cylinder cooler 5, but
Closes when fully cooled. In addition, the second on-off valve 7
Is open until the mix tank cooler 6 sufficiently cools the mix tank, but closes when the mix tank is sufficiently cooled.

Then, the refrigerant discharged from the compressor 1 enters the condenser 2, where it radiates heat to be condensed and liquefied to reach the first on-off valve 3 and the second on-off valve 7. When both the cylinder and the mix tank are not sufficiently cooled, both the first on-off valve 3 and the second on-off valve 7 are open, so that part of the liquid refrigerant passes through the first on-off valve 3. After entering the first expansion device 4 and adiabatically expanding by being throttled here, it enters the cooler 5 for cylinders, where it is evaporated and vaporized by cooling the cylinders.

On the other hand, the remaining part of the liquid refrigerant enters the second expansion device 8 through the second opening / closing valve 7, is adiabatically expanded by being throttled here, and then merges with the refrigerant flowing out from the cylinder cooler 5 to mix tank. When it enters the cooling device 6 for cooling and cools the mix tank there, it evaporates and vaporizes itself. Then, in this state, the compressor 1 is returned to.

When the cylinder is sufficiently cooled by continuing the above operation, the first opening / closing valve 3 is closed, so that all the liquid refrigerant that has exited the condenser 2 is discharged to the second opening / closing valve 7, the second opening / closing valve 7. After entering the cooler 6 for the mix tank through the expansion device 8, the mix tank is cooled.

On the contrary, when the mix tank is sufficiently cooled, the second opening / closing valve 7 is closed, so that all the liquid refrigerant exiting the condenser 2 flows through the first opening / closing valve 3 and the first expansion device 4. After that, it enters the cooler 5 for the cylinder, cools the cylinder here, and then enters the cooler 6 for the mix tank, where the mix tank is cooled.

When the temperature of the mix tank becomes higher than the appropriate temperature range due to heat sterilization of the mix tank or the like, the second opening / closing valve 7 is opened, so that the refrigerant does not pass through the cylinder cooler 5 and flows to the mix tank cooler 6. Inlet to cool mix tank rapidly. Then, once the temperature of the mix tank is once cooled to an appropriate temperature, the second on-off valve 7 is closed, and thereafter, every time the first on-off valve 3 is opened, the mix tank cooler is passed through the cylinder cooler 5. The mix tank is cooled by the refrigerant flowing into 6, and the mix tank is maintained in an appropriate temperature range.

[Problems to be solved by the device]

In the above-mentioned conventional device, the temperature of the mix tank is maintained in an appropriate temperature range by opening and closing the first on-off valve 3 according to the temperature of the cylinder during the normal operation.

Therefore, when more products are taken out of the cylinder, such as when the sales frequency of products such as soft serve ice cream is high, the amount of mix supplied from the mix tank to the cylinder increases, and the temperature of the cylinder rises above the optimum temperature range. Then, the first on-off valve 3 is opened.

As a result, the refrigerant flows into the cylinder cooler 5 and the mix tank cooler 6 to cool the mix tank more frequently, so that the mix in the mix tank eventually freezes and cannot be supplied to the cylinder. was there.

[Means for Solving the Problems]

The present invention has been invented to solve the above-mentioned problems, and the gist thereof is a compressor, a condenser, a first
The on-off valve, the first throttle device, the cooler for the cylinder and the cooler for the mix tank are connected in this order, and the second on-off valve, the first throttle device and the cooler for the cylinder are connected in parallel to each other. In the frozen dessert manufacturing apparatus in which the on-off valve and the second expansion device are connected to each other to form a refrigerant circuit, a third embodiment is provided between the cylinder cooler and the mix tank cooler.
The throttling device, and one end of the bypass pipe is connected between the cylinder cooler and the third throttling device, and the other end is connected between the mix tank cooler and the compressor. Further, the third on-off valve and the fourth throttle device are connected in parallel to the machine condenser and the second on-off valve, and the second on-off valve and the third on-off valve are attached to the mix tank. A frozen dessert manufacturing apparatus is characterized in that opening / closing control is performed according to the temperature detected by the temperature sensor.

[Action]

Since the frozen dessert manufacturing apparatus of the present invention has the above-mentioned configuration, during the normal operation, when the first opening / closing valve is opened, most of the refrigerant flowing out of the cylinder cooler flows to the compressor through the bypass pipe, and Only the part flows into the cooler for the mix tank through the third expansion device to cool it, and then flows to the compressor. The amount of refrigerant flowing into the cooler for the mix tank depends on the throttle amount of the third expansion device and the resistance of the bypass pipe, and when the temperature sensor attached to the mix tank raises the temperature above a predetermined temperature. , The second on-off valve is opened, and the refrigerant liquid from the condenser is passed through the second expansion device to the cooler for the mix tank to cool the mix tank, and when the temperature falls below a predetermined temperature, the third on-off valve is opened. It is opened, and the temperature of the mix tank is maintained within a certain range by introducing high temperature refrigerant gas into the cooler for the mix tank to heat the mix tank.

〔Example〕

 FIG. 1 shows an embodiment of the present invention.

As shown in FIG. 1, a third expansion device 30 is interposed between the cylinder cooler 5 and the mix tank cooler 6,
The other end of a bypass pipe 31 having one end connected between the third expansion device 30 and the cylinder cooler 5 is connected between the mix tank cooler 6 and the compressor 1. And
A resistor 32 is interposed in the bypass pipe 31.

Further, a third on-off valve 9 and a fourth on-off valve, one end of which is connected between the compressor 1 and the condenser 2, and the other end of which is connected between the second on-off valve 7 and the second expansion device 8. A refrigerant pipe 40 having a throttling device is provided in parallel with the condenser 2 and the second on-off valve 7, and the third on-off valve 9 and the second on-off valve 7 are attached to the surface of the mix tank 6. The temperature sensor (thermistor) 50 controls the opening and closing as shown in FIG.

Other configurations are similar to those of the conventional one shown in FIG. 4, and corresponding members are designated by the same reference numerals.

When the first on-off valve 3 is opened during normal operation, most of the refrigerant flowing out of the cylinder cooler 5 is bypass pipe.
Through 31 and resistor 32. Then, only a part of the refrigerant enters the cooler 6 for the mix tank through the third expansion device 30, where it is evaporated and vaporized, and then merges with the refrigerant flowing through the bypass pipe 31 and flows into the compressor 1. To do. Therefore, the third diaphragm device
The amount of refrigerant flowing into the mix tank cooler 6 can be controlled to an appropriate amount by appropriately selecting the throttle amount of 30 and the resistance of the bypass pipe 31 itself or the value of the resistor 32 interposed therein. .

On the other hand, a temperature sensor 50 mounted on the outer surface of the mix tank
When the detected temperature rises to a temperature of T4 or higher, the second opening / closing valve 7 is opened as shown in FIG. 2, and a part of the liquid refrigerant from the condenser 2 is discharged to the second opening / closing valve 7 and the second throttle device. It flows through 8 to the cooler 6 for mix tanks, evaporates here, cools the mix tanks, and when the temperature becomes T3 or lower, the second on-off valve 7 is closed. Further, when the temperature of the mix tank further decreases to T1 or less, the third opening / closing valve 9 opens, and a part of the high-temperature refrigerant gas from the compressor 1 partially discharges the third opening / closing valve 9 and the fourth expansion device.
The mixture flows through 10 and the second expansion device 8 to the cooler for the mix tank to heat the mix tank, and when the temperature becomes T2 or higher, the third opening / closing valve 9 is closed.

In this way, the temperature of the mix tank is kept within a certain range to prevent the mix from cooling.

Although the above control is control linked to the operation of the compressor 1, the second on-off valve 7 is opened only when the temperature detected by the temperature sensor 50 is T4 or higher for a certain time after the compressor 1 is stopped. By doing so, the mix tank can be cooled more quickly.

FIG. 3 shows an embodiment in which the present invention is applied to a soft serve ice cream freezer with a heating function. In Fig. 3, 1 is a compressor, 2 is a condenser, 4,8,10,16,18,19,30 are throttle devices, 5 is a cylinder cooler, 6 is a mix tank cooler, and 11 is a cooler. Four-way switching valve, 12 is a heat exchanger, 13, 14, 17, 20,
Reference numeral 21 is a check valve, 3, 7, 9, 15, 22 are opening / closing valves, 31 is a bypass pipe, 40 is a refrigerant pipe, and 50 is a temperature sensor.

During normal cooling operation, the four-way switching valve 11 is switched as shown by the solid line. Therefore, the refrigerant discharged from the compressor 1 enters the condenser 2 via the four-way switching valve 11 as shown by the solid line arrow, and radiates heat there to condense and liquefy, and the first on-off valve 3 and the first on-off valve 3 2 to the on-off valve 7.

Now, when both the cylinder and the mix tank are not sufficiently cooled, the first opening / closing valve 3 and the second opening / closing valve 7 are both open, so that part of the liquid refrigerant is part of the first opening / closing valve 3. After entering the first expansion device 4, it is adiabatically expanded by being throttled here. Next, since the on-off valve 22 is closed, this refrigerant enters the heat exchanger 12 and exchanges heat there. Since the on-off valve 15 is closed, the refrigerant flowing out of the heat exchanger 12 enters the cylinder cooler 5 via the check valve 13 and is evaporated and vaporized by cooling the cylinder here.
Most of the refrigerant flowing out of the cylinder cooler 5 flows through the bypass pipe 31 and the check valve 20 interposed therein, but part of the refrigerant flows through the throttle valve of the third throttle device 30 and the on-off valve 7. The resistance of the cooler 6 for the mix tank flowing together with the passed refrigerant and the resistance of the bypass pipe 31 and the check valve 20 enter the cooler 6 for the mix tank by an amount corresponding to the resistance of the bypass tank 31 and the refrigerant through the on-off valve 7. Cool the tank. Then, this refrigerant gas merges with the refrigerant flowing through the bypass pipe 31 and heads for the four-way switching valve 11.

On the other hand, when the temperature detected by the temperature sensor 50 is T4 or higher and the second opening / closing valve 7 is open, the liquid refrigerant that has not flowed into the first opening / closing valve 3 passes through the second opening / closing valve 7 and the check valve 14. After entering the second expansion device 8 and being adiabatically expanded by being throttled here, it merges with the refrigerant from the third expansion device 30 and flows into the mix tank cooler 6.

The gas refrigerant that has flowed through the four-way switching valve 11 enters the heat exchanger 12 where it exchanges heat with the liquid refrigerant that has flowed through the first expansion device 4 to eliminate the degree of superheat and then the check valve 21. After that, the flow returns to the compressor 1 to complete the refrigeration cycle.

When the cylinder is sufficiently cooled by continuing the above operation, the first opening / closing valve 3 is closed. Therefore,
All of the liquid refrigerant exiting the condenser 2 is the second on-off valve 7, check valve 1
4, It enters into the cooler 6 for mix tanks via the 2nd expansion device 8, and cools a mix tank.

On the other hand, when the mix tank is sufficiently cooled and the temperature becomes T ₃ or less, the second on-off valve 7 is closed, so that the cooler 6 for the mix tank thereafter includes the first on-off valve 3, The refrigerant flows through the first expansion device 4, the heat exchanger 12, the check valve 13, the cylinder cooler 5, and the third expansion device 30. When the temperature of the mix tank falls below T ₁ , the third on-off valve 9 opens, and the gas refrigerant at the temperature flowing out from the four-way switching valve 11 causes the third on-off valve 9, the throttle device 10, the check valve 14, It flows into the cooler 6 for the mix tank through the second expansion device 8 to heat the mix tank, and keeps the mix tank temperature within a certain range.

On the other hand, during heating operation, the four-way switching valve 11 is switched as shown by the broken line. Then, the gas refrigerant discharged from the compressor 1 enters the mix tank cooler 6 through the four-way switching valve 11 as shown by the broken line arrow, and after radiating a part of the gas refrigerant, most of the gas refrigerant is discharged to the third throttle. After entering the cylinder cooler 5 through the device 30, the heat dissipation is completed and the condensation and liquefaction are completed. Most of the liquid refrigerant passes through the on-off valve 15 and the expansion device.
After entering 16 and being decompressed here, enter heat exchanger 12,
It is cooled here, but part of it goes through the expansion device 18 and the check valve 21.
Flow into. On the other hand, a part of the refrigerant flowing out from the cooler 6 for the mix tank passes through the on-off valve 22 and the expansion device 19, then merges with the refrigerant flowing out from the heat exchanger 12, and enters the condenser 2 via the check valve 17. Here, the refrigerant that has entered the condenser 2 takes heat from the surroundings to evaporate and vaporize, and then enters the heat exchanger 12 through the four-way switching valve 11 and exchanges heat with the refrigerant that has flowed out of the expansion device 16, thereby causing the degree of superheat. After the elimination, the refrigerant is merged with the decompressed refrigerant through the expansion device 18, the temperature of the refrigerant gas is further lowered and the refrigerant is returned to the compressor 1 to complete the refrigeration cycle.

Here, the third throttling device 30 is selected to have a size sufficient to flow the refrigerant liquid during the heating operation, and a resistance gas refrigerant gas during the cooling operation. In this way, the mix in the mix tank and cylinder is heat-sterilized.

[Effect of device]

In the present invention, a third expansion device is interposed between the cylinder cooler and the mix tank cooler and one end is connected between the cylinder cooler and the third expansion device. Since the other end of the bypass pipe was connected between the cooler for the mix tank and the compressor, during its normal operation, most of the refrigerant flowing out from the cooler for the cylinder was made to flow to the compressor via the bypass pipe, and Only the amount of refrigerant commensurate with the throttling amount of the No. 3 expansion device and the resistance of the bypass pipe flows into the cooler for the mix tank through the third expansion device to cool the mix tank. The temperature sensor attached to the mix tank controls the second on-off valve and the third on-off valve to keep the temperature of the mix tank within a certain temperature range. It is possible to prevent the mix from freezing due to overdosing.

[Brief description of drawings]

FIG. 1 is a refrigerant circuit diagram showing a first embodiment of the present invention, and FIG.
FIG. 3 is a diagram for explaining the opening / closing operation of the on-off valve, FIG. 3 is a refrigerant circuit diagram showing a second embodiment of the present invention, and FIG. 4 is a refrigerant circuit diagram of a conventional frozen dessert manufacturing apparatus. Compressor …… 1, condenser …… 2, first on-off valve …… 3, first expansion device …… 4, cylinder cooler …… 5, mix tank cooler …… 6, second Open / close valve …… 7, second throttle device …… 8,
Third on-off valve …… 9, fourth expansion device …… 10, third expansion device …… 30, bypass pipe …… 31, refrigerant pipe …… 40, temperature sensor …… 50.

Claims (1)

[Scope of utility model registration request] 1. A compressor, a condenser, a first on-off valve, a first throttle device, a cylinder cooler and a mix tank cooler are connected in this order, and the first on-off valve and the first throttle are connected. In a frozen dessert manufacturing apparatus in which a second on-off valve and a second expansion device are connected in parallel to a device and a cylinder cooler to form a refrigerant circuit, the cylinder cooler and the mix tank cooler are provided. A third expansion device is interposed between the compressor and the other end of a bypass pipe whose one end is connected between the cylinder cooler and the third expansion device and the other end of which is the mix tank cooler and the compressor. And a third opening / closing valve and a fourth throttle device in parallel with the condenser and the second opening / closing valve, and connecting the second opening / closing valve and the third opening / closing valve. The temperature detected by the temperature sensor attached to the above mix tank Ri ice confection producing device which is characterized in that so as to open and close control.