JP2002202084A - Impellor variable speed pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impellor variable speed pump driving a pump at variable speed with low cost. SOLUTION: This pump is provided with a planetary gear mechanism 40 transmitting the rotation of a drive shaft 10 rotating at constant speed to an output shaft 20, a sun gear rotation means 60 rotating a sun gear 41 of the planetary gear mechanism 40, and a control means 51 controlling rotation speed of the output shaft 20 by adjusting rotation speed of the sun gear 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impeller variable speed pump for changing the rotation speed of a pump for pumping water.

[0002]

2. Description of the Related Art Conventionally, pumps used for pumping and the like are:
It is driven via a speed reducer that reduces the rotational speed given by the prime mover. Such a conventional pump drive device is shown in FIGS. The driving device of this pump electrically controls the rotation speed of the prime mover E by the control device 100 and transmits the rotational speed to the pump S via the speed reducer 101, as shown in FIG. Between the transmission fluid coupling 103 and the transmission fluid coupling 103.
The mechanical control shown in FIG. 6 is used to transmit the driving force to the pump S by changing the transmission torque by adjusting the oil amount of the fluid coupling oil supply pump 104.

[0003]

However, a control device 100 for electrically controlling the rotation speed of the prime mover E is provided.
Is large and requires not only installation costs but also large operating costs. In addition, the speed change fluid coupling 103
Mechanical control requires a separate fluid coupling oil supply pump 104. In addition, the transmission fluid coupling 103 has a large slip loss in the variable speed range, and a device for cooling the heat generated by the slip is also required, which is problematic in terms of cost.

[0004] The present invention has been made in view of such problems, and a transmission device for driving a pump at a variable speed is provided.
It is intended to be realized at low cost.

[0005]

According to a first aspect of the present invention, there is provided an impeller for variably transmitting a rotational speed from a drive shaft rotating at a constant speed to an output shaft for driving a pump. A variable speed pump, a planetary gear mechanism for transmitting rotation of a drive shaft to an output shaft, sun gear rotating means for rotating a sun gear of the planetary gear mechanism, and a rotation speed of the sun gear by the sun gear rotating means. And control means for controlling the rotation speed of the output shaft by adjusting. The impeller variable speed pump according to the present invention adjusts the rotation of the sun gear of the planetary gear mechanism while changing the speed of the rotation of the drive shaft via the planetary gear mechanism and transmitting the speed to the output shaft. A variable-speed impeller can be provided at a low cost, which can efficiently control the rotation of the output shaft without providing the pump.

According to a second aspect of the invention, there is provided the impeller variable speed pump according to the first aspect, further comprising a drive transmission system for transmitting the rotation of the drive shaft to the planetary gear mechanism, wherein the sun gear rotating means is driven by a drive source. The gear is rotated, and the ring gear of the planetary gear mechanism is provided with external teeth, and the drive transmission system is a gear train for rotating the external teeth. In the impeller variable speed pump according to the present invention, the sun gear is rotated by the drive source, and the rotation speed of the sun gear can be adjusted by adjusting the speed of the drive source, so that the rotation speed of the output shaft is easily controlled. be able to. Further, since the ring gear is rotated by the gear train, the output shaft can be reliably rotated.

According to a third aspect of the present invention, in the impeller variable speed pump according to the second aspect, the drive source includes an oil pump driven by a drive shaft and a hydraulic motor driven by the oil pump. The means adjusts the rotation speed of the sun gear by controlling at least one of the oil supply amount of the oil pump and the rotation speed of the hydraulic motor to control the rotation speed of the output shaft. Since the impeller variable speed pump uses the rotation of the drive shaft to rotate the sun gear, no separate device is required, so that the installation cost and the operating cost can be reduced.

[0008] The invention according to claim 4 is based on claim 2.
In the impeller variable speed pump, the driving source has an electric motor, and the control means controls the rotation speed of the sun gear by controlling the rotation speed of the electric motor to control the rotation speed of the output shaft. Features. This impeller variable speed pump does not require large power to rotate the sun gear, so the sun gear is rotated by the electric motor. Therefore, an easy-to-maintain and inexpensive impeller variable speed pump is provided. Can be.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of an impeller variable speed pump according to the present invention.
FIG. 2 is a schematic diagram showing a pump drive device using the impeller variable speed pump. This impeller variable speed pump is a motor E
The drive shaft 10 is rotated at a constant speed by the planetary gear mechanism 40 via a drive transmission system (gear train) 70 to rotate the output shaft 20 orthogonal to the drive shaft 10. It is configured to drive the connected pump S.

The drive shaft 10 rotates the ring gear 44 via a gear train 70. That is, in order to transmit the rotation of the drive shaft 10 to the planetary gear mechanism 40 whose axis is orthogonal to the drive shaft 10, a bulky gear 10a is attached to the end of the drive shaft 10.
The drive transmission shaft 12 is provided with a bulky gear 71. Further, the drive transmission shaft 12 has a spur gear 72 that meshes with external teeth 44 b provided on the ring gear 44.
Is provided. When the gear 10a of the drive shaft 10 and the gear 71 of the drive transmission shaft 12 mesh with each other, the drive shaft 1
The rotation of 0 is transmitted to the drive transmission shaft 12, and the ring gear 44 is rotated via the gear 72 (FIG. 2A).

Further, the drive transmission shaft 12 is provided with a drive gear 11 at an end thereof. The drive gear 11 meshes with a gear 52 a provided on the oil pump 52 and also meshes with a gear 30 a provided on the oil supply pump 30. Therefore, when the drive shaft 10 is rotated by the prime mover E, the ring gear 44 is rotated, and the drive transmission shaft 12 is rotated, so that the oil pump 52 and the oil supply pump 30 are driven. These gears 5
The meshing of 2a, 30a and 11 is shown in FIG.

As shown in FIG. 2 (a), the planetary gear mechanism 40 has a planetary gear 42 meshed with a sun gear 41, and a planetary frame 43 supporting these planetary gears 42 has an output shaft as shown in FIG. The output shaft 20 is connected to one end of the output shaft 20 so as to rotate integrally with the output shaft 20. Further, the planetary gear 42 meshes with the internal teeth 44 a of the ring gear 44.

The sun gear 41 is provided at the end of the central shaft 61 and is rotated by sun gear rotating means 60. That is, the sun gear rotating means 60 includes an oil pump (drive source) 52 driven by the rotation of the drive shaft 10, and a piston-type hydraulic motor (drive source) 53 that is supplied with high-pressure oil from the oil pump 52 and rotates. And a control means 51 for adjusting the rotation speed and the rotation direction by adjusting the angle of the swash plate of the hydraulic motor 53 and the like, and the central shaft 61 is rotated by the hydraulic motor 53. That is, the rotation speed and the rotation direction of the central shaft 61 (sun gear 41) can be adjusted by the control means 51. (Note that the planetary gear mechanism 40 and the gear train 70 are lubricated by being supplied with oil by the oil supply pump 30 operated by the gear 30a.)

Although the control means 51 may be operated manually, it detects the discharge water amount and discharge water pressure of the pump S which is connected to and driven by the output shaft 20, and supplies a constant water amount or water pressure based on this detection signal. Such automatic control is also possible.

The impeller variable speed pump constructed as described above operates as follows. First, when the prime mover E is driven and the drive shaft 10 is rotated, the drive transmission shaft 12 is rotated via the gear 10a and the gear 71, and the drive gear 11 rotates the gear 52a and the gear 30a. The rotation of the gear 52a drives the oil pump 52, and the oil pump 52 drives the hydraulic motor 53. The speed and direction of the rotation of the hydraulic motor 53 are adjusted by the control means 51, and the rotation rotates the central shaft 61, thereby rotating the sun gear 41 at an arbitrary rotation speed and direction.

While the sun gear 41 is rotated in this manner, the ring gear 44 is rotated by the gear 72.
The planetary gear 42 meshing with the ring gear 44 revolves while meshing with the sun gear 41 and revolves around the planetary frame 43.
And the output shaft 20 is rotated. This output shaft 20
Is changed from the rotation speed of the drive shaft 10 in accordance with the number of teeth of each gear constituting the planetary gear mechanism 40. That is, since the rotation speed of the planetary frame 43 is the sum or difference of the rotation speeds of the sun gear 41 and the ring gear 44, the rotation speed of the sun gear 41 and the rotation speed of the sun gear 41 are controlled by the control unit 51 for the ring gear 44 rotated at a constant speed. By adjusting the rotation direction, the revolution speed of the planetary gear 42, that is, the planetary frame 4
3, the rotation speed of the output shaft 20 can be controlled.

For example, the number of teeth of the inner teeth 44a of the sun gear 41 and the ring gear 44 is ZS1, ZS2 (ZS1 <
Suppose that the sun gear 41 is given a rotation speed of nS1 as ZS2). When the ring gear 44 is not rotated, the rotation speed nA1 of the planet frame 43 is nA1 = nS1 / (1+ (ZS2 / ZS1)).

Conversely, when the sun gear 41 is not rotated and the ring gear 44 is given a rotation speed of nS2, the planetary frame 43
Is the rotation speed nA2 of nA2 = nS2 / (1+ (ZS1 / ZS2)).

Therefore, the sun gear 41 and the ring gear 4
4 are nS1 and nS2 respectively, the planetary frame 4
The rotation speed nA of 3 is as follows: nA = nS1 / (1+ (ZS2 / ZS1)) + nS2 /
(1+ (ZS1 / ZS2)) Since nS2, ZS1, and ZS2 are constant, the rotation speed (= nA) of the output shaft 20 changes according to the rotation speed nS1 of the sun gear 41.

As described above, the rotation of the output shaft 20 transmitted from the drive shaft 10 can be changed only by adjusting the speed of the hydraulic motor 53 driven by the drive shaft 10 rotating at a constant speed. An oil pump 30 for supplying oil to the planetary gear mechanism 40 and an oil pump 5 for driving the hydraulic motor 53 are provided.
2 can be driven by the rotation of the drive shaft 10,
Since the structure is simple, maintenance of the device is easy.

FIG. 3 shows another embodiment of the present invention. This uses an electric motor 55 that can rotate the sun gear 41 and can adjust the rotation speed, and is easier to maintain than the hydraulic motor 53. In this embodiment, by using the electric motor 55, it is necessary to further provide a motor driving power supply 56. However, since the power required to rotate the sun gear 41 is small, maintenance is easy without increasing the size of the apparatus. Implements a variable impeller variable speed pump.

It should be noted that the shapes, combinations, and the like of the components shown in the above-described embodiment are merely examples, and can be variously changed without departing from the spirit of the present invention. In the above embodiment, the rotation speed of the output shaft 20 is controlled by adjusting the rotation speed of the hydraulic motor 53. However, the oil pressure of the oil pump 52 may be adjusted, or the speed of the hydraulic motor 53 and the capacity of the oil pump 52 may be adjusted. May be adjusted together. Further, a plurality of gear trains having different speed ratios may be provided between the hydraulic motor 53 and the central shaft 61, and the rotation speed of the sun gear 41 may be adjusted by switching these gear trains. Further, the drive transmission system for transmitting the rotation of the drive shaft 10 does not need to use the gear train 70, and may be, for example, a belt or a chain.

[0023]

As described above, in the impeller variable speed pump according to the first aspect, the rotation of the drive shaft is reduced and transmitted to the output shaft via the planetary gear mechanism, and the sunshade of the planetary gear mechanism is reduced. By adjusting the rotation of the gears, it is possible to provide a low-cost impeller variable speed pump that can efficiently control the rotation of the output shaft without providing a large-scale device.

In the impeller variable speed pump according to the second aspect, since the sun gear is rotated by the drive source, the rotation speed of the sun gear can be adjusted by adjusting the speed of the drive source. Can be easily controlled. Further, since the ring gear is rotated by the gear train, the output shaft can be reliably rotated.

In the impeller variable speed pump according to the third aspect,
Since the sun gear is rotated using the rotation of the drive shaft, no separate device is required, so that installation costs and operation costs can be reduced.

In the impeller variable speed pump according to the fourth aspect, the sun gear, which can be rotated without requiring large power, is rotated by the electric motor, so that maintenance is easy and the cost is low. Can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an impeller variable speed pump according to the present invention.

FIG. 2 is a schematic diagram showing gear engagement of an impeller variable speed pump according to the present invention.

FIG. 3 is a sectional view showing another embodiment of the impeller variable speed pump according to the present invention.

FIG. 4 is a schematic diagram showing a configuration of a pump driving device using the impeller variable speed pump according to the present invention.

FIG. 5 is a schematic diagram showing a configuration of a conventional pump driving device.

FIG. 6 is a schematic diagram showing a configuration of a conventional pump driving device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Drive shaft 11 Drive gear 20 Output shaft 30 Oil pump 40 Planetary gear mechanism 41 Sun gear 42 Planetary gear 43 Planetary frame 44 Ring gear 44a Internal tooth 44b External tooth 51 Control means 52 Oil pump (drive source) 53 Hydraulic motor (drive source) 30a, 71, 72 Gear 55 Electric motor (drive source) 56 Motor drive power source 60 Sun gear rotating means 61 Center shaft 70 Drive transmission system (gear train) E Primer motor S Pump

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H020 DA04 DA07 3H075 AA02 BB01 CC08 CC12 CC30 CC40 DA30 DB04 DB22 DB50 EE04 EE13 3J028 EA07 EB33 EB35 EB37 EB63 FB05 FB13 FC13 FC23 FC32 FC38 FC42 FC64 FD11 FD21 GA40

Claims (4)

[Claims] 1. An impeller variable speed pump for variably transmitting a rotation speed of an output shaft for driving a pump impeller from a drive shaft rotating at a constant speed, wherein the rotation of the drive shaft is transmitted to the output shaft. A planetary gear mechanism, a sun gear rotating means for rotating a sun gear of the planetary gear mechanism, and a rotation of the output shaft connected to the planetary gear by adjusting a rotation speed of the sun gear by the sun gear rotating means. Control means for changing the speed to a variable speed. 2. A drive transmission system for transmitting rotation of the drive shaft to the planetary gear mechanism, wherein the sun gear rotation means includes:
The sun gear is rotated at a variable speed by a drive source, the ring gear of the planetary gear mechanism is provided with external teeth, and the drive transmission system is a gear train for rotating the external teeth. 2. The impeller variable speed pump according to 1. 3. The drive source includes an oil pump driven by the drive shaft, and a hydraulic motor driven by the oil pump. The control unit controls an oil supply amount of the oil pump and the hydraulic motor 3. The impeller variable speed pump according to claim 2, wherein the rotation speed of the output shaft is controlled by adjusting the rotation speed of the sun gear by adjusting at least one of the rotation speeds of the impeller. 4. The driving source includes an electric motor, and the control means controls the rotation speed of the sun gear by adjusting the rotation speed of the electric motor to control the rotation speed of the output shaft. The impeller variable speed pump according to claim 2, characterized in that: