Freezer

Abstract

To provide a food and drink freezing method which can complete freezing in a short time.SOLUTION: In a freezing method, a food or drink E is placed in a low temperature coolant A to freeze the food or drink E. The coolant A is flowed to rotate the food or drink E around a vertical axis L and thereby freeze the food or drink E while carrying heat away from the food or drink E. The food or drink E is a bottled alcohol N and the bottled alcohol N is vertically set to be rotated. The bottled alcohol N is rotated in a high speed rotation area to generate stirring flow of the alcohol in a bottle B.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] This issue Ming is frozen Regarding the device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, there is known a freezing device that freezes food by placing it in a cooling liquid (an aqueous ethyl alcohol solution) at a low temperature (for example, around −30° C.) (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2008-70035 A Summary of the Invention [Problem to be solved by the invention]

[0004] However, Patent Document 1 Frozen The device requires a sufficient amount of time for the food and drink to be supercooled before it is placed in the cooling liquid, which overall results in a laborious and time-consuming process.

[0005] Therefore, the present invention is capable of completing freezing in a short time. Cutting and freezing The present invention aims to provide an apparatus. [Means for solving the problem]

[0006] The present invention Related refrigeration The device includes a bottomed cylinder containing a low-temperature cooling liquid, bottomed The cylindrical body is provided with a food and beverage holder for holding food and beverage, and a propeller fixed to the bottom wall side of the food and beverage holder, and the food and beverage holder is rotated by spraying the cooling liquid onto the propeller to rotate the propeller.

[0007] The cooling device further includes a bottomed cylinder for accommodating a low-temperature cooling liquid and a bottle of alcohol. bottomed The cylinder is equipped with a bottle holder for inserting the bottled alcohol from above and holding it therein, and a propeller fixed to the bottom wall side of the bottle holder, and is configured so that the coolant is sprayed onto the propeller to rotate it, thereby rotating the bottled alcohol.

[0008] In addition, multiple bottomed A cylindrical body is provided, and each of the above bottomed The bottle holder and the propeller are provided in a cylindrical body, and a plurality of the bottomed The cylindrical body is placed on a mounting table, and a cooling device for cooling the cooling liquid, a tank for storing the cooling liquid, and a cooling tank for storing the cooling liquid are provided in the mounting table. bottomed A pump for delivering the liquid into the cylindrical body is provided. bottomed The cylindrical body is configured to share the cooling device, the tank, and the pump.

[0009] In addition, the cooling liquid is injected from an injection port to the propeller. bottomed The cooling liquid is discharged from the cooling outlet provided at a lower position of the cylindrical body. bottomed It is provided at an upper position of the cylindrical body.

[0010] The cooling system further includes a liquid tank for accommodating a low-temperature cooling liquid, and a plurality of bottomed cylinders for accommodating a bottle of alcohol are provided in the liquid tank. bottomed The cylinder is provided with a bottle holder for inserting the bottled alcohol from above and holding it therein, and a propeller fixed to the bottom wall side of the bottle holder, and the cooling liquid is sprayed onto the propeller to rotate the propeller, thereby rotating the bottled alcohol. bottomed The cooling liquid is provided at a lower position of the cylindrical body. bottomed The liquid is configured to overflow from the upper end edge of the cylindrical body, bottomed A discharge port for discharging the cooling liquid that overflows from the upper edge of the cylinder is provided above the liquid tank.

[0011] Moreover, the above propeller, Rotation speed: 100 rpm or more and 600 rpm or less The rotation is performed by rotating the rotating shaft.

[0012] In addition, bottomed The cylindrical body is equipped with a forward rotation nozzle for spraying the cooling liquid onto the propeller to rotate it in the forward direction, and a reverse rotation nozzle for spraying the cooling liquid onto the propeller to rotate it in the reverse direction, and is configured so that the propeller can be switched between forward and reverse rotation at predetermined time intervals by selectively spraying the cooling liquid from either the forward rotation nozzle or the reverse rotation nozzle. The cooling liquid is intermittently sprayed onto the propeller, and the propeller is repeatedly rotated and stopped at predetermined time intervals. Effect of the Invention

[0013] This issue Ming Frozen The device allows freezing to be completed in a short period of time. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view showing a first embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. 4 is a simplified cross-sectional view of a main portion showing the flow of a cooling liquid. [Figure 6] FIG. 11 is a simplified cross-sectional plan view of a main portion showing a second embodiment. [Figure 7] FIG. [Figure 8] FIG. 13 is a partially cutaway perspective view showing a fifth embodiment. [Figure 9] FIG. [Figure 10] FIG. [Figure 11]FIG. 4 is a simplified cross-sectional view of a main portion showing the flow of a cooling liquid. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will be described in detail below based on the illustrated embodiments. 1 and 2 show a first embodiment of the present invention. The refrigeration device of the present invention freezes food and drink E, and includes a plurality of bottomed cylinders 1 (three in the embodiment of FIG. 1) that contain low-temperature cooling liquid A. The low-temperature cooling liquid A is, for example, an ethyl alcohol aqueous solution (alcohol concentration: about 60%) at a temperature between -35°C and -25°C. Each cylinder 1 includes a food and drink holder 2 for holding food and drink E, and a propeller 3 fixed to the bottom wall 15 side of the food and drink holder 2. In the present invention, "fixed to the bottom wall side" includes both a case where the propeller 3 is fixed directly to the bottom wall and a case where the propeller 3 is fixed via a shaft connected to the bottom wall. The food and drink holder 2 is rotated by injecting cooling liquid A (by a pump not shown) to the propeller 3 to rotate the propeller 3 continuously.

[0016] A case where the food and drink E is bottled alcohol N (for example, Japanese sake, particularly unpasteurized sake) will be described as an example. Each cylinder 1 is for containing one bottle of bottled alcohol N. Inside the cylinder 1, there is provided a bottle holder 16 for inserting the bottled alcohol N from above and holding it, and a propeller 3 fixed to the bottom wall 18 side of the bottle holder 16. The propeller 3 is configured to rotate by injecting a cooling liquid A into the propeller 3 to rotate it continuously, thereby rotating the bottled alcohol N. The food and drink holder 2 (bottle holder 16) is, for example, in the shape of a saucer with many holes. A rotary bearing 4 is provided to rotatably support the rotary shaft 3A of the propeller 3. The rotary bearing 4 is not limited to the ball bearing of FIG. 2, but may be a metal bearing.

[0017] A plurality of cylinders 1 are placed on a mounting table 17. A chiller for cooling the cooling liquid A, a tank for storing the cooling liquid A, and a pump for sending the cooling liquid A into the cylinders 1 are disposed within the mounting table 17 (the chiller, tank, and pump are not shown). The chiller, tank, and pump are configured to be shared by a plurality of cylinders 1. The chiller, tank, and pump are appropriately connected to the cylinders 1 by piping not shown.

[0018] The outer peripheral surface of the cylinder 1 is provided with a heat insulating material 12 for suppressing the transfer of heat between the cooling liquid A and the outside. The heat insulating material 12 is made of, for example, urethane foam. An injection port 5 for injecting the cooling liquid A onto the propeller 3 is provided at a lower position of the cylinder 1, and an outlet 6 for discharging the cooling liquid A is provided at an upper position of the cylinder 1.

[0019] 3 is a plan view showing the positional relationship between the injection port 5 and the exhaust port 6. The two-dot chain line P in FIG. 3 indicates the path that the outermost point of the propeller 3 (see FIG. 2) traces during rotation. The injection port 5 opens at a position eccentric to the rotation axis of the propeller 3, where the coolant A is injected. It is preferable that the exhaust port 6 be provided so that it opens at a position eccentric to the rotation axis of the propeller 3 in the opposite direction to the injection port 5. The propeller 3 is rotated in the direction indicated by the arrow Y in FIG. 3. 3 Rotate in the opposite direction (counterclockwise).

[0020] As shown in Figs. 1 and 2, the device is provided with a lid 7 that can be opened and closed to cover the cylindrical body 1. An electromagnetic lock 13 is provided to keep the lid 7 closed. As shown in Fig. 4, the device is provided with a pressing member 8 that presses the stopper S of the bottled alcohol N from above, a spring member 9 that resiliently biases the pressing member 8 downward, and a rotary bearing 10 that holds the pressing member 8 rotatably around a vertical axis L. The pressing member 8 and other members prevent the bottle B from becoming misaligned or falling over. As shown in Fig. 5, the cooling liquid A flows in a spiral shape. Note that the propeller 3, the bottle holder 16, and other elements are omitted from Fig. 5.

[0021] Bottled alcohol N is held in food and beverage holder 2 (bottle holder 16), and propeller 3 is configured to rotate in a high-speed rotation range. An agitating flow of alcohol is generated inside bottle B. The high-speed rotation range is 100 rpm or more and 600 rpm or less, and preferably 250 rpm or more and 500 rpm or less. When the rotation speed is within the above range, the heat transfer rate (between bottle B and cooling liquid A) is fast, and bottled alcohol N can be frozen efficiently in a short time. When the rotation speed is less than 100 rpm, the agitating flow generated in the alcohol inside bottle B is weak, and the heat transfer rate is slow. When the rotation speed exceeds 600 rpm, the heat transfer rate slows (this is thought to be because reattachment of the separated flow becomes prominent, making it more difficult to agitate near the center).

[0022] The gap dimension T (see Figs. 2 and 5) between the outer surface of the bottled alcohol N and the inner surface of the cylinder 1 is set to 5 mm or more and 15 mm or less. When the gap dimension T is within the above range, the gap between the bottle B and the inner surface of the cylinder 1 is narrow, the flow rate of the cooling liquid A is fast, the heat transfer coefficient is increased, and the cooling effect is enhanced. Furthermore, the thermal resistance is reduced. In other words, the bottled alcohol N can be frozen in a shorter time. When the gap dimension T is less than 5 mm, pressure is applied to the bottled alcohol N, and there is a risk that the bottled alcohol N will float up (especially when the pressing member 8, etc. is omitted, the bottled alcohol N will float up). When the gap dimension T is more than 15 mm, the flow rate of the cooling liquid A is slowed down, the heat transfer coefficient is reduced, and the effect of reducing the time required for freezing is reduced.

[0023] 6 and 7 show a second embodiment. A cylindrical body 1 rotates a propeller 3 (see FIG. 2) in the forward direction (arrow Y in FIG. 6). 1 The propeller 3 is rotated in the forward direction (arrow Y in FIG. 7). 2The third embodiment is provided with a forward rotation nozzle 5A and a reverse rotation nozzle 5B at the same height below the cylindrical body 1, which spray coolant A onto the propeller 3 to change the propeller direction (rotation direction). By selectively spraying coolant A from the forward rotation nozzle 5A and the reverse rotation nozzle 5B, the propeller 3 is configured to switch between forward and reverse rotation at predetermined time intervals (for example, by using an electromagnetic valve). The other configurations are the same as those of the first embodiment.

[0024] The third embodiment will be described. The cooling liquid A is intermittently injected to the propeller 3, and the propeller 3 is configured to rotate and stop repeatedly at predetermined time intervals. Specifically, the cooling liquid A is intermittently injected to the propeller 3 so that the propeller 3 repeatedly rotates forward and stops. The other configurations are the same as those of the first embodiment.

[0025] A fourth embodiment will be described. In the refrigeration system shown in Figures 6 and 7, cooling liquid A is intermittently injected to the propeller 3 so that the propeller 3 repeats a cycle of forward rotation, stopping, reverse rotation, and stopping in that order. That is, cooling liquid A is injected from the forward rotation nozzle 5A, then the injection is stopped, and then the coolant A is injected from the reverse rotation nozzle 5B, and the injection is stopped again, in that order, so that the rotation and stopping of the propeller 3 are repeated at predetermined time intervals. The other configurations are the same as those of the second embodiment.

[0026] 8 to 11 show a fifth embodiment. The liquid tank 14 contains a low-temperature cooling liquid A. The liquid tank 14 has a heat insulating material 22. The heat insulating material 22 is made of, for example, urethane foam. The liquid tank 14 contains a plurality of bottomed cylinders 1 each containing a bottle of alcohol N. Each cylinder 1 contains a bottle holder 16 for inserting the bottled alcohol N from above and holding it, and a propeller 3 fixed to the bottom wall 18 side of the bottle holder 16. The bottled alcohol N is rotated by injecting the cooling liquid A into the propeller 3 to rotate the propeller 3. An injection port 5 for injecting the cooling liquid A into the propeller 3 is provided at a lower position of the cylinder 1, and the cooling liquid A is configured to overflow from the upper edge of the cylinder 1.

[0027] As shown in Fig. 10, a branch pipe 21 is connected from a common base pipe 20 to each cylinder 1. An outlet 19 (see Fig. 8) for discharging cooling liquid A that overflows from the upper edge of the cylinder 1 is provided above the liquid tank 14. As shown in Fig. 11, the cooling liquid A flows in a spiral shape. Note that the propeller 3, bottle holder 16, etc. are omitted in Fig. 11. The other configurations are the same as those of the first embodiment.

[0028] Next, the present invention Using a refrigeration device A method for freezing food and drink will be described. Food and drink E is placed in low-temperature cooling liquid A and frozen. Specifically, the cooling liquid A is run through the food and drink E, causing it to rotate around a vertical axis L, and the heat is removed from the food and drink E while it is frozen. For example, if the food and drink E is bottled alcohol N, the bottled alcohol N is placed vertically and frozen while being rotated around the vertical axis L.

[0029] The bottled alcohol N is rotated in a high speed rotation region to generate an agitated flow of the alcohol inside the bottle B.

[0030] The cooling liquid A is configured to circulate so that after being discharged from the cylinder 1, it flows back into the cylinder 1 (via a cooling machine, tank, pump, etc.). The shape and structure of the food and drink holder 2 is adapted to the shape and properties of the food and drink E (not limited to a tray shape with many holes). The bottled alcohol N may be wine, shochu, shochu wine, etc. The food and drink E may be any food or drink, including (vacuum-packed) meat, fish, etc., soft drinks, non-alcoholic drinks, and seasonings such as mirin and soy sauce.

[0031] The present invention is open to design modifications, and for example, the number of cylinders 1 can be increased or decreased (each cylinder 1 has a food and beverage holder 2 and a propeller 3 inside). For example, the number of cylinders 1 may be 1, 8, 12, etc. Also, the pressing member 8, spring member 9, and rotary bearing 10 may be omitted. Also, a separate type may be used in which the cooler, tank, and pump for cooling the cooling liquid A are installed in a different location (rather than being built into the mounting table 17).

[0032] Also, the food and drink E may be held in the food and drink holder 2, and the propeller 3 may be rotated in a high-speed rotation range. Also, a small hole may be formed in the base pipe 20 or the branch pipe 21, and the cooling liquid A may be sprayed (into the inside of the cylinder 1) and also to the outside of the cylinder 1. Also, the basic configuration may be the same as that of the refrigeration device of the fifth embodiment shown in FIG. 8, etc., and the cylinder 1 may be provided with a forward rotation nozzle 5A and a reverse rotation nozzle 5B, and the forward and reverse rotation of the propeller 3 may be switched at predetermined time intervals. Also, a refrigeration device having the basic configuration of the refrigeration device of the fifth embodiment may be configured to intermittently spray the cooling liquid A to the propeller 3, and to repeatedly rotate and stop the propeller 3 at predetermined time intervals.

[0033] As described above, the present invention is a freezing method in which food or beverage E is placed in low-temperature cooling liquid A and the food or beverage E is frozen. By flowing the cooling liquid A, the food or beverage E is rotated around the vertical axis L, and heat is removed from the food or beverage E while it is frozen, thereby increasing the heat transfer coefficient and enabling the food or beverage E to be frozen in a short period of time.

[0034] Furthermore, since the food and drink E is bottled alcohol N, and the bottled alcohol N is placed vertically and rotated, the bottled alcohol N can be frozen efficiently.

[0035] In addition, the bottled alcohol N is rotated in a high-speed rotation region to generate an agitated flow of alcohol inside the bottle B, so that the bottled alcohol N can be frozen in an even shorter time.

[0036] Also, the device is provided with a bottomed cylinder 1 that contains low-temperature cooling liquid A, a food and drink holder 2 for holding food and drink E within the cylinder 1, and a propeller 3 fixed to the bottom wall 15 side of the food and drink holder 2, and the food and drink holder 2 is rotated by spraying the cooling liquid A onto the propeller 3 to rotate the propeller 3, thereby making it possible to have a simple configuration that does not require a drive motor.Food and drink E can be frozen in a short time.

[0037] Also, the device is equipped with a bottomed cylinder 1 that contains low-temperature cooling liquid A and also contains one bottle of bottled alcohol N, a bottle holder 16 for inserting the bottled alcohol N from above into the cylinder 1 and holding it, and a propeller 3 fixed to the bottom wall 18 side of the bottle holder 16, and is configured so that the cooling liquid A is sprayed onto the propeller 3 to rotate the propeller 3, thereby rotating the bottled alcohol N, thereby making it possible to have a simple configuration that does not require a drive motor.Food and drink E can be frozen in a short time.

[0038] In addition, the system is provided with a plurality of cylindrical bodies 1, each of which is provided with the bottle holder 16 and the propeller 3. The plurality of cylindrical bodies 1 are placed on a mounting table 17, and within the mounting table 17 are disposed a chiller for cooling the cooling liquid A, a tank for storing the cooling liquid A, and a pump for sending the cooling liquid A into the cylindrical bodies 1. The chiller, tank, and pump are shared for the plurality of cylindrical bodies 1, making the system more compact than a case in which a plurality of refrigeration devices each equipped with a chiller, etc., are installed.

[0039] In addition, an injection port 5 for injecting the cooling liquid A onto the propeller 3 is provided at a lower position of the cylinder 1, and an outlet port 6 for discharging the cooling liquid A is provided at an upper position of the cylinder 1, so that the cooling liquid A can be made to flow in a spiral shape, and the bottled alcohol N can be frozen efficiently.

[0040] The device is also provided with a liquid tank 14 for containing a low-temperature cooling liquid A, and a plurality of bottomed cylinders 1 for containing a bottle of alcohol N in the liquid tank 14, and each cylinder 1 is provided with a bottle holder 16 for inserting the bottled alcohol N from above and holding it, and a propeller 3 fixed to the bottom wall 18 side of the bottle holder 16, and configured to rotate the bottled alcohol N by spraying the cooling liquid A onto the propeller 3 to rotate the propeller 3, and a spray nozzle 5 for spraying the cooling liquid A onto the propeller 3 is provided below the cylinder 1, and configured so that the cooling liquid A overflows from the upper edge of the cylinder 1, and a discharge port 19 for discharging the cooling liquid A overflowing from the upper edge of the cylinder 1 is provided above the liquid tank 14, so that a simple configuration is achieved without the need for a drive motor. Food and drink E can be frozen in a short time. Moreover, the overflowing coolant A accumulates around the cylindrical body 1, so that the temperature of the coolant A inside the cylindrical body 1 can be efficiently kept low.

[0041] In addition, since the propeller 3 is configured to rotate in a high speed rotation range, it is possible to appropriately freeze the food and drink E in an even shorter time. For example, bottled alcohol N can be frozen in 15 to 20 minutes (while it would take about 100 minutes to freeze it without the flow of cooling liquid A).

[0042] Moreover, the cylinder 1 is provided with a forward rotation nozzle 5A for spraying the cooling liquid A onto the propeller 3 to rotate the propeller 3 forward, and a reverse rotation nozzle 5B for spraying the cooling liquid A onto the propeller 3 to rotate the propeller 3 backward, and the forward and reverse rotations of the propeller 3 are switched at predetermined time intervals by selectively spraying the cooling liquid A from the forward rotation nozzle 5A and the reverse rotation nozzle 5B, so that the alcohol in the bottle B is sufficiently stirred and the cooling efficiency is increased. In other words, the bottled alcohol N can be frozen in a shorter time.

[0043] In addition, the cooling liquid A is intermittently sprayed onto the propeller 3, and the propeller 3 is configured to rotate and stop repeatedly at predetermined time intervals, which further promotes the stirring of the alcohol inside the bottle B, and the bottled alcohol N can be frozen in an even shorter time. [Explanation of symbols]

[0044] 1 (bottomed) cylindrical body 2 Food and drink holder 3 Propeller 5 Nozzle 5A Forward rotation injection port 5B Reverse rotation nozzle 6 Outlet 14 Liquid tank 15 Bottom wall 16 Bottle holder 17 Placement table 18 Bottom wall 19 Outlet A Cold coolant E drinking food N Bottled alcohol

Claims

1. In a refrigeration method of placing food or drink (E) in a low-temperature coolant (A) and freezing the food or drink (E), the method is characterized in that by flowing the coolant (A), the food or drink (E) is rotated around a vertical axis (L), and heat is taken from the food or drink (E) while freezing.

2. The refrigeration method of food or drink according to claim 1, wherein the food or drink (E) is bottled alcohol (N), and the bottled alcohol (N) is placed vertically and rotated.

3. The refrigeration method of food or drink according to claim 2, wherein the bottled alcohol (N) is rotated in a high-speed rotation region so as to generate a stirring flow of alcohol inside the bottle (B).

4. A bottomed cylindrical body (1) for containing a low-temperature coolant (A) is provided, inside the cylindrical body (1), a food or drink holder (2) for holding food or drink (E) and a propeller (3) fixed to the bottom wall (15) side of the food or drink holder (2) are provided, A refrigeration device is characterized in that the coolant (A) is injected into the propeller (3) to rotate the propeller (3), thereby rotating the food or drink holder (2).

5. A bottomed cylindrical body (1) for containing a low-temperature coolant (A) and containing one bottled alcohol (N) is provided, inside the cylindrical body (1), a bottle holder (16) for inserting and holding the bottled alcohol (N) from above and a propeller (3) fixed to the bottom wall (18) side of the bottle holder (16) are provided, A refrigeration device is characterized in that the coolant (A) is injected into the propeller (3) to rotate the propeller (3), thereby rotating the bottled alcohol (N).

6. A plurality of the cylindrical bodies (1) are provided, and inside each of the cylindrical bodies (1), the bottle holder (16) and the propeller (3) are provided, the plurality of the cylindrical bodies (1) are installed on a mounting table (17), inside the mounting table (17), a cooler for cooling the coolant (A), a tank for containing the coolant (A), and a pump for sending the coolant (A) into the cylindrical body (1) are arranged, The refrigeration device according to claim 5, wherein the cooler, the tank, and the pump are configured to be shared for the plurality of the cylindrical bodies (1).

7. The refrigeration device according to claim 5 or 6, wherein an injection port (5) for injecting the coolant (A) into the propeller (3) is provided at a lower position of the cylindrical body (1), and a discharge port (6) for discharging the coolant (A) is provided at an upper position of the cylindrical body (1).

8. A liquid tank (14) for storing a low-temperature coolant (A) is provided, and a plurality of bottomed cylindrical bodies (1) for storing a bottle of alcohol (N) are provided in the liquid tank (14). Each of the cylindrical bodies (1) is provided with a bottle holder (16) for inserting and holding the bottled alcohol (N) from above, and a propeller (3) fixed to the bottom wall (18) side of the bottle holder (16). The bottled alcohol (N) is configured to be rotated by injecting the coolant (A) into the propeller (3) to rotate the propeller (3). An injection port (5) for injecting the coolant (A) into the propeller (3) is provided at a lower position of the cylindrical body (1), and the coolant (A) is configured to overflow from the upper edge of the cylindrical body (1). A refrigeration device, characterized in that a discharge port (19) for discharging the coolant (A) that has overflowed from the upper edge of the cylindrical body (1) is provided above the liquid tank (14).

9. The refrigeration device according to claim 4, 5, 6 or 8, wherein the propeller (3) is configured to rotate in a high-speed rotation region.

10. The cylindrical body (1) is provided with a forward rotation injection port (5A) for injecting the coolant (A) into the propeller (3) to rotate the propeller (3) forward, and a reverse rotation injection port (5B) for injecting the coolant (A) into the propeller (3) to rotate the propeller (3) in reverse. The forward rotation and reverse rotation of the propeller (3) are configured to be switched every predetermined time by selectively injecting the coolant (A) from the forward rotation injection port (5A) and the reverse rotation injection port (5B). The refrigeration device according to claim 5, 6 or 8.

11. The refrigeration device according to claim 5, 6 or 8, wherein the coolant (A) is intermittently injected into the propeller (3), and the rotation and stop of the propeller (3) are repeated every predetermined time.

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