KR100885549B1 - Variable speed driving apparatus using water as working fluid - Google Patents

Abstract

Variable speed drive device using the water according to the present invention as a working medium, the drive shaft for providing a rotational force (10); A driving wheel 11 connected to the driving shaft 10 and rotating; An inner housing (3) integrally coupled with the motor vehicle (11) and containing water (W) as a working fluid therein; A driven vehicle 21 installed in the inner housing 3 and rotating by a flow force of water in the motor vehicle 11 and the inner housing 3; A driven shaft 20 connected to the driven vehicle 21 to rotate; An outer housing (2) surrounding the outside of the motor vehicle (11) and the inner housing (3) and supporting the driving shaft (10) and the driven shaft (20); A water supply pipe 35 for supplying water into the inner housing 3; A scoop tube 30 for discharging water in the inner housing 3 to the outside; And a control lever 33 connected to the swim tube 30, wherein the swim tube 30 has a curved portion 31 and the curve extending in a radial direction of the inner housing in the inner housing 3. A straight portion 32 connected to the portion 31 and extending to the outside of the outer housing 2, wherein the straight portion 32 is rotatable by the operation lever 33, and the straight portion ( Rotation of the 32 allows the curved portion 31 to rotate within the inner housing 3.

Variable Speed, Drive, Fluid Coupling, Power Transmission, Drive Shaft, Drive Shaft, Drive Car, Drive Wheel, Rotator, Pump, Blower, Speed, Rotation

Description

Variable speed driving apparatus using water as working fluid}

Fig. 1 is a sectional view of a variable speed drive device 1 'using lubricating oil according to the prior art.

2 is a schematic cross-sectional view of a variable speed drive apparatus 1 using water as a working medium according to the present invention.

3 and 4 are some broken views illustrating the operating structure of the swim tube 30 shown in FIG.

5 is a control system diagram of a variable speed drive apparatus 1 using water as a working medium according to the present invention.

FIG. 6 shows that the drain 36 is formed on the surface of the inner housing 3 of the variable speed drive device 1 shown in FIG.

* Description of the symbols for the main parts of the drawings *

1 ': Conventional variable speed drive device 1: Variable speed drive device of the present invention

2, 71: outer housing 3, 72: inner housing

10, 50: drive shaft 11, 51: drive car

20, 60: driven shaft 21, 61: driven car

30: scoop tube 30a: water outlet

31: Skew tube curved portion 32: Skew tube straight portion

33: operation lever 35: water supply pipe

35a: water intake 36: drain

38: bowl 38a: connecting hose

50b: drive shaft support bearing 51a: drive shaft support bearing

53: lubricant pump 53a: lubricant pump gear

54: lubricant reservoir 55: lubricant cooler

55a: lubricant supply line 55b: lubricant discharge line

62a, 62b: driven shaft support bearing 75: swim tube

76: swim tube support tube 100: control unit

200: pump, blower 200a: suction line

200b: discharge head 210: pressure sensor

220: electric motor 230: filter

240: solenoid valve 260: check valve

270: actuator L: lubricant

W: water

FIELD OF THE INVENTION The present invention relates to a variable speed drive using water as a working medium, and in particular to use water as a power transmission medium in a conventional fluid coupling used for converting a rotational speed of a driven shaft rotated by a primary shaft. The present invention relates to a variable speed drive device that can simplify an installation, reduce an installation cost, and reduce a failure factor.

Conventionally, AC induction motors, which are often used in industrial facilities, are convenient to use, but they cannot be changed unless additional equipment is installed. Actually, in the field where AC motors are used as the power source, the load of the motor is Depending on the demand, it was necessary to change the number of revolutions of the motor according to the amount of power required by the system.

Looking at the problem caused by not changing the rotational speed of the motor, for example, a centrifugal pump driven by the motor is an example. In the case of a centrifugal pump, since the rotation speed of the motor is constant, the outlet pressure of the pump is always constant at a constant flow rate. However, when the system requires a small pressure and flow rate of the centrifugal pump, a throttle valve must be installed at the outlet of the pump to lower the pressure and flow rate. Going.

The same problem also occurs in the case of a blower. In other words, if the rotational speed of the motor is left as it is, when the flow rate required by the system is small, the flow rate should be reduced by closing the guide vane on the blower suction side or closing the damper at the outlet. There is a problem that loss occurs.

In order to solve this problem, various apparatuses for adjusting the rotational speed of a conventional electric motor have been developed, and according to the operation principle, it can be divided into an electric method and a mechanical method.

Among these, a representative device that electrically converts the rotational speed of the motor is a frequency conversion device (commonly called an inverter), and controls the rotational speed of the motor by adjusting the frequency and voltage of electric power supplied to the motor. . However, the frequency converter is not widely used due to the low reliability of the equipment, such as expensive equipment, requires a lot of installation space, and many problems that are still unresolved, such as harmonics.

On the other hand, as a device for mechanically converting the rotational speed of the electric motor by using the principle of the fluid coupling to change the rotational speed coming from the driving shaft is the most used device for controlling the rotational speed of the driven shaft.

The variable speed drive apparatus using the principle of fluid coupling has low equipment cost, small failure and reliable control, but there is a problem that the device is complicated and the power transmission amount is small due to the use of lubricating oil as the medium of the variable speed drive.

Fig. 1 is a sectional view of a variable speed drive device 1 'using lubricating oil according to the prior art. Referring to Figure 1, the variable speed drive device (1 ') using a conventional lubricating oil is a driving vehicle connected to the driving shaft (50) when the power of the driving station is transmitted to the driving shaft (50) to rotate the driving shaft (50) As the 51 rotates, a working fluid flows, and the driven vehicle 61 is rotated by the flow of the working fluid, so that power is transmitted to the driven shaft 60. Although not shown in FIG. 1, the motor vehicle 51 has a plurality of rotor blades therein, so that the rotor blades of the motor vehicle 51 are rotated by the working fluid (that is, lubricating oil). L)) is rotated and flown. The motor vehicle 51 is integrally coupled to the inner housing 72, and the lubricant as a working fluid is contained in the inner space formed by the motor vehicle 51 and the inner housing 72.

And the outer housing 71 which surrounds the said drive wheel 51 and the inner housing 72 is provided. The outer housing 71 serves to support the driving shaft 50 and the driven shaft 60, and a lubricant reservoir 54 and a lubricant pump 53 are formed at the bottom thereof.

In FIG. 1, reference numeral 50a denotes a prime shaft gear formed on the prime shaft 50, and 53a rotates in engagement with the prime shaft gear 50a as a lubricant pump gear connected to the shaft of the lubricant pump 53. Reference numeral 55a is a lubricating oil supply pipe extending from the lubricating oil cooler 55 to the motor vehicle 51, and 55b is a lubricating oil discharge pipe extending from the lubricating oil pump 53 to the lubricating oil cooler 55. Reference numeral 50b denotes a coaxial support bearing. And 62a and 62b are driven shaft support bearings, and 51a is a motor vehicle support bearing.

In FIG. 1, the motor vehicle 51 having the rotary blades serves as a pump, and the driven vehicle 61 facing the motor vehicle 51 serves as a turbine. Although not shown in FIG. 1, since the driven vehicle 61 also has a plurality of rotary vanes, the driven vehicle 61 is rotated by the flow force of the lubricating oil L generated while the motor vehicle 51 and the inner housing 72 are rotated. Done. That is, in FIG. 1, lubricating oil L is supplied between a pair of rotors serving as a pump and a turbine (that is, a motor 51 serving as a pump and a driven vehicle 61 serving as a turbine). While rotating the driving shaft 50, the lubricating oil (L) transmits power to the driven shaft (60) to turn the driven shaft (60).

At this time, if the amount of lubricating oil (L) to be filled between the driving car 51 and the driven car 61 is adjusted, the speed of the driven car 61 can be increased or decreased even if the speed of the driven car 51 is constant. have. That is, when there is a lot of lubricating oil between the motor vehicle 51 and the driven vehicle 61, power is transmitted well, and the speed of the driven vehicle 61 approaches the speed of the motor vehicle 51, and the lubricating oil therebetween. If less, the power transmission is not good, the speed of the driven car 61 is reduced. In addition, if the amount of lubricating oil L between the driving car 51 and the driven car 61 is small, the driving car 51 also requires a small force, and thus, the amount of the lubricating oil L may be used. The rotation speed of the driven vehicle 61 can be added or decreased.

In summary, when the motor vehicle 51 connected to the motor shaft 50 of the electric motor rotates, the lubricating oil L of the lubricating oil reservoir 54 is circulated by the lubricating oil cooler 55 by the lubricating oil pump 53. Lubricant oil L, which is supplied to the inner space of the vehicle 51 and the inner housing 72 and rotates under centrifugal force by the rotation of the motor vehicle 51, moves the driven vehicle 61 serving as a turbine. This transmission causes the driven car 61 to rotate in the same direction.

At this time, when the scoop tube (75) having a hole at the end is lowered in the downward direction of the inner housing (72), the lubricating oil (L) that transmits power between the motor vehicle 51 and the driven vehicle 61 is It will be taken out and returned to the lubricating oil reservoir 54. When the flow rate of the lubricating oil L taken out from the stop tube 75 is greater than the lubricating oil flow rate supplied from the lubricating oil pump 55 to the inner housing 72, power is transmitted between the prime mover 51 and the driven vehicle 61. Since the quantity of the lubricating oil L to be made becomes small, the driven wheel 61 rotates slower than the driving wheel 51.

According to this principle, since the position of the stop tube 75 becomes the power transmission amount and the speed adjusting tool of the driven vehicle 61, an automatic adjustment device is attached to the stop tube 75 to automatically adjust the speed according to the demand of the system. It is designed to adjust.

In FIG. 1, reference numeral 76 is a scoop tube support tube installed at one side of the outer housing 71 to allow the scoop tube 75 to be inserted therein.

When the variable speed drive device 1 ′ using the conventional lubricating oil described by FIG. 1 is used, the power of the electric motor is reduced and the rotation speed changes according to the demand of the system, thereby enabling smooth control.

However, since the above-described conventional technique uses lubricating oil as a working medium, the lubricating oil reservoir 54 must be provided under the variable speed drive (i.e., under the outer housing 71), and the lubricating oil can be supplied to the variable speed drive. There should also be a lubricating oil pump 53, and there is a problem that the equipment is complicated, such as having to have a lubricating oil cooler 55 to cool the temperature of the lubricating oil rises. In addition, the variable speed drive device 1 ′ using the conventional lubricating oil has a problem that the lubricating oil may leak out of the fog state due to the use of the lubricating oil, and thus cannot be used when hygiene is to be managed, such as the food industry.

In order to solve the above problems, the present invention simplifies the installation, reduces the installation cost, and reduces the source of failure by using water used in any facility as a power transmission medium instead of the lubricant used in the conventional fluid coupling device. It is an object of the present invention to provide a variable speed drive device reduced by.

In addition, the present invention by using water as a working medium instead of lubricating oil, new fluid coupling drive variable speed drive system that has not been used in the food industry due to the contamination problem of the conventional lubricating oil can be widely used in all industries. It is an object to provide a variable speed drive device of the type.

In order to achieve the above object, the variable speed drive device using water provided by the present invention as a working medium includes: a driving shaft 10 for providing a rotational force; A driving wheel 11 connected to the driving shaft 10 and rotating; An inner housing (3) integrally coupled with the motor vehicle (11) and containing water (W) as a working fluid therein; A driven vehicle 21 installed in the inner housing 3 and rotating by a flow force of water in the motor vehicle 11 and the inner housing 3; A driven shaft 20 connected to the driven vehicle 21 to rotate; An outer housing (2) surrounding the outside of the motor vehicle (11) and the inner housing (3) and supporting the driving shaft (10) and the driven shaft (20); A water supply pipe 35 for supplying water into the inner housing 3; A scoop tube 30 for discharging water in the inner housing 3 to the outside; And a control lever 33 connected to the swim tube 30, wherein the swim tube 30 has a curved portion 31 and the curve extending in a radial direction of the inner housing in the inner housing 3. A straight portion 32 connected to the portion 31 and extending to the outside of the outer housing 2, wherein the straight portion 32 is rotatable by the operation lever 33, and the straight portion ( The curved portion 31 is rotatable in the inner housing 3 by the rotation of 32.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and effect of the variable speed drive device using water as a working medium according to the present invention.

2 is a schematic cross-sectional view of a variable speed drive apparatus 1 using water as a working medium according to the present invention. Referring to FIG. 2, the variable speed drive device 1 of the present invention is fluidly coupled in a state in which the driving shaft 10 and the driven shaft 20 are supported by the outer housing 2, whereby the rotational force of the driving shaft 10 is increased. It is transmitted to the driven shaft 20. The driving wheel 11 coupled to the front end of the driving shaft 10 is rotated by the rotation of the driving shaft 10, and the inner housing 3 is integrally coupled to the driving wheel 11 so as to have a working medium therein. That is, it contains water (W). Although not shown in the drawing, the motor vehicle 11 has a plurality of rotor blades so that the water in the inner housing 3 rotates due to the rotation of the motor vehicle 11.

In the space created by combining the motor vehicle 11 and the inner housing 3, the driven vehicle 21 is installed adjacently facing the motor vehicle 11, the driven vehicle is also not shown in Figure 2, but a plurality of rotations Has wings to rotate in the same direction to receive the flow force of water generated by the motor vehicle (11).

In the variable speed drive device 1 of the present invention, a water supply pipe 35 for supplying water into the inner housing 3 is formed, and a stop tube 30 for draining out the water in the inner housing 3 is formed. As shown in FIGS. 3 and 4, the swim tube 30 has a curved portion 31 disposed in a radial direction of the inner housing 3, and the curved portion 31 is connected to a straight portion 32. It extends past the inner housing 3 and the outer housing 2. The operation lever 33 is coupled to the straight portion 32 of the swim tube 30. When the operation lever 33 is moved, the position of the swim tube 30 is as shown in FIGS. 3 and 4. Can be variable. That is, in the present invention, the end of the curved portion 31 of the swim tube 30 (that is, the inlet portion where water begins to enter into the swim tube 30) by the swing tube 30 being rotated in the inner housing 3. ) May be adjacent to the circumferential portion of the inner housing 3 (state of FIG. 3), or may be placed close to the center side away from the circumferential portion of the inner housing 3 (state of FIG. 4).

When the motor shaft 10 is rotated by the electric motor connected to the motor shaft 10, water (W) is introduced into the inner housing (3) through the water supply pipe 35, the motor vehicle 11 and the driven vehicle 21 In between are filled. Subsequently, the water W filled between the motor vehicle 11 and the driven vehicle 21 is slid outwardly in the circumferential direction of the rotation space composed of the motor vehicle 11 and the inner housing 3 by centrifugal force. Rotational power is transmitted to the driven vehicle 21 to rotate.

At this time, if the water in the prime mover 11 and the inner housing 3 is drained out by the swept tube 30, the amount of water between the prime mover 11 and the driven vehicle 21 is also reduced, thereby reducing the power transmission amount. The rotation speed of) decreases.

Since water W present in the inner space of the motor vehicle 11 and the inner housing 3 is subjected to rotational movement between the rotating motor vehicle 11 and the driven vehicle 21, the water W passes through the swim tube 30. When the pressure is changed to have a sufficient circulation force to pass through the water outlet (30a) and the hose (not shown) connected thereto.

In the present invention, instead of lubricating oil, general water is used as a medium for power transmission. Since the water does not have a large flow rate and the specific heat is more than twice that of the lubricating oil, the temperature rise is only less than half even for cooling the same amount of heat. Therefore, in the present invention, if a separate cooler is installed in the variable speed drive device 1, water is cooled and reused by the cooler. If there is no cooler, the coolant may be exposed to the atmosphere and simply cooled.

The variable speed drive device 1 of the present invention can simplify the installation by using water as the power transmission medium as described above, since it does not require a lubricating oil pump, a lubricating oil reservoir, and a lubricating oil cooler, as compared with a conventional lubricating oil. It can save the equipment manufacturing cost and fundamentally eliminate the cause of the failure caused by the complicated equipment.

In addition, since the water used as the working medium in the variable speed drive device 1 according to the present invention has a larger specific gravity than the lubricating oil used in the existing apparatus, the volume of the power transmission device is reduced or the amount of power transmission as much as the specific gravity difference. It is possible to increase the size, and as a result, there is no need for a lubricating oil reservoir and a pump, thereby further reducing the volume of the power transmission device. In the present invention, by improving the conventional swivel tube 30 to perform a rotational movement to reduce the circulating force of the power transmission water while reducing the volume of the drive device.

In FIG. 2, reference numeral 35a is a water intake port connected to the water supply pipe 35, and is preferably connected to an external water supply device by a hose or the like.

3 and 4 are some broken views illustrating the operating structure of the swim tube 30 shown in FIG. 3 and 4, the structure and principle of the improved swim tube 30 according to the present invention will be described. The swim tube 30 may include a curved portion 31 placed along the radial direction inside the inner housing 3. It consists of a straight portion 32 connected to the curved portion 31. Since the end of the straight portion 32 is connected to the control lever 33, when the control lever 33 is rotated by an external operating means (actuator), the curved portion 31 of the scoop tube in the inner housing 3 ) Can be rotated.

In FIG. 3, the curved portion 31 of the swim tube 30 is preferably such that its bent direction faces the direction of rotation of the water W (that is, opposite to the direction of rotation of the motor vehicle 11). In this way, the water (W) that rotates in the inner housing (3) can easily enter the inlet of the curved portion 31 of the swim tube 30, the pressure loss by the swim tube 30 can be minimized in this process have.

3 shows that the swim tube 30 is located in the inner housing 3 radially outward (i.e., the circumferential portion) so that the water W escapes a lot. Accordingly, in the case of FIG. 3, the amount of water between the primary vehicle 11 and the driven vehicle 21 is reduced, so that the rotational speed of the driven vehicle 21 is reduced. On the other hand, FIG. 4 shows that the swim tube 30 is located radially inward (ie, at the center of the motor vehicle and the driven vehicle) in the inner housing 3 so that the water W does not come out of the inner housing 3. On the other hand, since water (W) is continuously supplied into the inner housing (3) through the water supply pipe 35, the amount of water between the prime mover (11) and the driven vehicle (21) is blown, the rotational speed of the driven vehicle (21) Will increase.

According to the present invention, the required shape for adjusting the position of the swim tube 30 can be drastically reduced by forming the swim tube 30 in a curved shape and allowing the curved portion 31 to rotate in the inner housing 3. have. As a result, the present invention can use the space of the variable speed drive device 1 more efficiently, and when the water (W) is introduced into the swim tube 30, the loss of kinetic energy is reduced and the pressure loss can be reduced. have.

5 is a control system diagram of a variable speed drive apparatus 1 using water as a working medium according to the present invention. Referring to Figure 5, the control system of the variable speed drive device 1 of the present invention, when the rotational speed of the pump or blower 200 by the variable speed drive device 1 changes the pressure in the discharge head (200b) The pressure sensor 210 measures and sends a measurement signal to the control unit 100. Since the preset value is input to the controller 100, the controller 100 compares the value actually measured by the discharge head 200b with the set value and calculates a control value at that time through a predetermined control operation. When a driving signal is applied to the actuator 270 by the control value calculated by the controller 100, the actuator 270 rotates the control lever 33 of FIGS. 2 to 4 to adjust the position of the swim tube 30. Variable. When the position of the swim tube 30 is changed, the rate at which power energy generated from the electric motor M is transmitted to the pump or the blower 200 is changed. As a method of control operation performed by the controller 100, it is preferable to use proportional-integral-differential (PID) control which is frequently used for the control of the fluid machine.

In FIG. 5, the water flowing into the variable speed drive device 1 passes through the filter 230 to remove the foreign matter and then passes through the solenoid valve 240. The water discharged from the variable speed drive device 1 through the swim tube 30 is transferred to the outside for cooling, etc. The water discharged once to the outside by installing a check valve 260 on this path Is prevented from flowing back into the variable speed drive device 1 even when the motor is stopped.

In FIG. 5, reference numeral 200a denotes a suction line of the pump or the blower 200.

In FIG. 5, the solenoid valve 240 is opened after a slight time delay until the motor reaches a prescribed speed in order to reduce the starting current of the motor M when the motor M is started. Therefore, the solenoid valve 240 supplies water (W) into the variable speed drive device 1 only after a predetermined time after the start of the electric motor (M). And when the motor (M) is stopped, the solenoid valve 240 is closed to block the supply of water.

In FIG. 5, the present invention is applied to a general pump or blower 200. When starting the pump or blower 200, the point where the spool tube 30 has a minimum power transmission amount (that is, a motor vehicle ( 11) and the point close to the center axis of the driven vehicle 21 to minimize the motor M starting current and protect the motor.

Since the pump or the blower 200 generally aims to control the pressure, the pump 100 or the blower 200 detects the outlet pressure of the pump or the blower 200, converts it into an electronic signal, and sends it to the control unit 100. The control unit 100 controls the preset program. The value is sent to the operating device of the stop tube (actuator 270) to move the stop tube 30 to adjust the speed of the driven shaft 21 to an optimum value.

FIG. 6 shows that the drain 36 is formed on the surface of the inner housing 3 of the variable speed drive device 1 shown in FIG.

In the present invention, the use of water as the working medium has a number of advantages over the conventional lubricating oil, but if there is any foreign matter in the water supplied to the variable speed drive device (1) when the equipment is continuously operated foreign matter There is a possibility of concentration inside this rotor wheel (i.e., the motor vehicle 11 and the inner housing 3). Accumulation of foreign matter accumulated in the inside of the rotor not only decreases the performance of the driving device but also shortens the life, so that the water supplied to the driving device 1 is filtered and then supplied through the filtering device (see FIG. 5).

However, in the case where the equipment in which the variable speed drive device 1 of the present invention is installed is operated continuously for a long time, even if the supply water filtration device 230 (Fig. 5) is installed, the outside of the rotor 11 and the inner housing 3 rotor Since foreign matter may be concentrated, at least one small drainage hole 36 is drilled in the circumferential portions of the motor vehicle 11 and the inner housing 3 so as to be minute at the time of rotation of the motor vehicle 11 and the inner housing 3. Continuous leakage of water can prevent premature failure due to the concentration of foreign matter.

In FIG. 6, one or more drain holes 36 are perforated on the inner housing 3 of the variable speed drive device 1 or the circumferential surface of the motor vehicle 11 of the present invention, and discharged through the drain holes 36. The water is preferably collected by the support bowl 38 and then discharged to the outside through the connection hose 38a.

The present invention has the greatest feature in that water is used as a power transmission medium instead of lubricating oil in order to improve the problems of the variable speed drive device using the conventional lubricating oil as a power transmission medium. By using all of the coolant as a power transmission medium for the variable speed drive, no reuse of the medium is required, no separate storage tank is required, no separate pump is needed to circulate the water, and no cooling system is required. There is an advantage that can be configured very simply, such as no.

The variable speed drive device using water as a working medium according to the present invention simplifies the installation and lowers the equipment cost by using water, which can be easily obtained and handled in general, as a power transmission medium instead of the lubricating oil that was used as the power transmission medium. In addition, there is an advantage in that the variable speed drive device can be widely used in a food factory by eliminating the source of health hazards due to the scattering of lubricating oil.

In the prior art, when lubricating oil is used in a variable speed drive device, the lubricating oil should be periodically replaced or refined. However, the present invention eliminates the need for such equipment by using water, thereby reducing equipment costs and simplifying the equipment. The use of variable speed drive can be increased due to the reduction of the element, and it can be easily modified and applied to existing facilities. In addition, the variable speed drive device using the water according to the present invention as a working medium to increase the efficiency of power transmission to reduce the power required in the industry, it can be effective to contribute to the activation of the industry because the control is simple.

In particular, since the variable speed drive device according to the present invention reduces the volume of the device as compared with the prior art, it is possible to greatly contribute to power savings by easily adding to an existing facility that is already installed and operating.

Claims (4)

A driving shaft 10 for providing rotational force; A driving wheel 11 connected to the driving shaft 10 and rotating; An inner housing (3) integrally coupled with the motor vehicle (11) and containing water (W) as a working fluid therein; A driven vehicle 21 installed in the inner housing 3 and rotating by a flow force of water in the motor vehicle 11 and the inner housing 3; A driven shaft 20 connected to the driven vehicle 21 to rotate; An outer housing (2) surrounding the outside of the motor vehicle (11) and the inner housing (3) and supporting the driving shaft (10) and the driven shaft (20); A water supply pipe 35 for supplying water into the inner housing 3; A scoop tube 30 for discharging water in the inner housing 3 to the outside; And And a manipulation lever 33 connected to the swim tube 30. The swim tube 30 is connected to the curved portion 31 and the curved portion 31 extending radially of the inner housing in the inner housing 3 and a straight line extending to the outside of the outer housing 2. It includes a portion 32, the straight portion 32 is rotatable by the operation lever 33, the curved portion 31 by the rotation of the linear portion 32 is the inner housing (3) A variable speed drive using water as a working medium, characterized in that it can rotate within. The method according to claim 1, wherein the curved portion 31 of the swim tube 30 is arranged such that its inlet faces the direction of rotation of water in the inner housing 3. Variable speed drive. The variable speed drive device according to claim 1, wherein at least one drain hole is formed on the inner housing (3) or on the circumferential surface of the motor vehicle (11). The method of claim 1, An actuator 270 for operating the operation lever 33; A sensor (210) for detecting a rotational speed of the driven shaft (20) or a physical quantity corresponding to the rotational speed; And And a controller 100 which compares an output of the sensor 210 with a preset value and applies a driving signal to the actuator 270 to adjust the position of the swim tube 30. , Variable speed drive using water as working medium.

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