JP2002202083A - 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 rotation of a drive shaft 10 rotated at a constant speed to an output shaft 20, a ring gear rotation means 50 rotating a ring gear 44 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 ring gear 44 with the ring gear rotation means 50.

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. The transmission fluid coupling 103 is disposed between the transmission fluid coupling 103 and the transmission fluid coupling 103.
A mechanically controlled configuration as shown in FIG. 6 is used in which the transmission torque is changed by adjusting the oil amount of No. 03 by the fluid connection oil supply pump 104 to transmit the driving force to the pump S.

[0003]

However, the control device 100 for electrically controlling the driving force of the prime mover E is large-scale and requires not only installation costs but also large operating costs. Further, the speed change fluid coupling 103
Mechanical control requires a separate oil supply pump 104 for fluid connection. Further, the speed change fluid coupling 10
No. 3 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]

In order to solve the above-mentioned problems, the invention according to claim 1 variably transmits a rotational speed from a drive shaft that rotates at a constant speed to an output shaft that drives a pump impeller. An impeller variable speed pump, a planetary gear mechanism for transmitting rotation of a drive shaft to an output shaft, ring gear rotating means for rotating a ring gear of the planetary gear mechanism, and a rotation speed of the ring gear by the ring gear rotating means And control means for controlling the rotational speed of the output shaft by adjusting the rotational speed of the output shaft. The impeller variable speed pump according to the present invention adjusts the rotation of the ring 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. It is possible to provide a low-cost impeller variable speed pump that can control the rotation of the output shaft without providing the pump.

According to a second aspect of the present invention, in the impeller variable speed pump according to the first aspect, the ring gear rotating means includes:
The ring gear is rotated from a drive source via a drive transmission system.

According to a third aspect of the present invention, in the impeller variable speed pump according to the second aspect, the ring gear is provided with external teeth, and the drive transmission system is a gear train for rotating the external teeth. Features.

[0008] The invention according to claim 4 is the invention according to claim 2 or 3.
In the impeller variable speed pump, the drive source includes an oil pump driven by a drive shaft, and a hydraulic motor driven by the oil pump, and the control unit controls the oil supply amount of the oil pump and the rotation of the hydraulic motor. It is characterized in that the rotational speed of the output gear is controlled by adjusting the rotational speed of the ring gear by adjusting at least one of the speeds. This impeller variable speed pump uses the rotation of the drive shaft to rotate the ring gear, and does not require a separate device, so that installation costs and operation costs can be reduced.

According to a fifth aspect of the present invention, in the impeller variable speed pump according to the second or third aspect, the drive source has an electric motor, and the control means adjusts the rotation speed of the electric motor to control the ring gear. It is characterized in that the rotation speed of the output shaft is controlled by adjusting the rotation speed. In this impeller variable speed pump, since a large power is not required to rotate the ring gear, the ring gear is rotated by the electric motor, so that an easy-to-maintain and inexpensive impeller variable speed pump is provided. Can be.

[0010]

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 speed is changed by the planetary gear mechanism 40 from the drive shaft 10 rotated at a constant speed by the output shaft 2, which is concentric with the drive shaft 10.
And the pump S connected to the output shaft 20 is driven.

As shown in FIGS. 2A and 2B, the drive shaft 10 is provided with a center gear 41 of a planetary gear mechanism 40 at an end opposite to the prime mover E, and a drive is provided at an intermediate portion. A gear 11 is provided. The drive gear 11 meshes with a gear 52 a provided on the oil pump 52, and when the drive shaft 10 is rotated by the prime mover E, the center gear 4
1 is rotated, and the gear 52a is rotated to drive the oil pump 52. The drive gear 11 meshes with a gear 30a provided in the lubrication oil supply pump 30, and can also drive the oil supply pump 30.

The planetary gear mechanism 40 has a planetary gear 42 meshed with a center gear 41 provided at one end of the drive shaft 10, and a planetary frame 43 supporting these planetary gears 42 is connected to the output shaft 2.
0 and is provided so as to rotate integrally with the output shaft 20. Further, the planetary gear 42 is a ring gear 44
With the internal teeth 44a.

Further, the ring gear 44 is rotated by ring gear rotating means 50 via external teeth 44b provided on the outer periphery. The ring gear rotating means 50 includes an oil pump (drive source) 52 driven by rotation of the drive shaft 10.
A piston-type hydraulic motor (drive source) 53 which is supplied with high-pressure oil from the oil pump 52 and rotates; and a gear 54a rotated by the hydraulic motor 53 is a first stage, and a ring gear is formed by a final stage gear 54b. 44 external teeth 44b
Gear train (drive transmission system) 54 that meshes with the hydraulic motor 5
And control means 51 for adjusting the rotation speed and the rotation direction by adjusting the angle of the swash plate 3 and the like. This control means 5
With 1, the rotation speed and the rotation direction of the ring gear 44 can be adjusted. (Note that the ring gear rotating means 50 and the planetary gear mechanism 40 are lubricated by being supplied with oil by the oil supply pump 30 operated by the drive gear 11.)

The control means 51 may be manually operated. However, the control means 51 is connected to the output shaft 20 to detect the discharge water amount and the discharge water pressure of the pump S to be driven, and to perform an automatic control such as supplying a constant water amount or water pressure. Is also possible.

The impeller variable speed pump constructed as described above operates as follows. First, when the prime mover E is driven to rotate the drive shaft 10, the center gear 41 provided at the end of the drive shaft 10 rotates. The planetary gear 42 meshing with the center gear 41 revolves while rotating and rotates the planetary frame 43 from the meshing with the ring gear 44, so that the output shaft 20 is rotated. The rotation speed of the output shaft 20 depends on the planetary gear mechanism 4.
The speed is changed from the rotation speed of the drive shaft 10 according to the number of teeth of each gear constituting 0.

On the other hand, a drive gear 11 provided in the middle of the drive shaft 10 drives an oil pump 52,
2 drives the hydraulic motor 53. Hydraulic motor 5
The speed and direction of the rotation of 3 can be adjusted by the control means 51. The rotation of the hydraulic motor 53 adjusted to rotate at any speed and direction allows the ring gear 44 to rotate at any speed and direction via the gear train 54. The rotation speed of the planetary frame 43 is the sum or difference of the rotation speeds of the center gear 41 and the ring gear 44.
By adjusting the rotation speed and the rotation direction of the ring gear 44, the revolution speed of the planetary gear 42, that is, the planetary frame 43 is adjusted.
The rotation speed of the can be adjusted. Therefore, by adjusting the rotation speed and direction of the hydraulic motor 53,
The rotation speed of the output shaft 20 can be controlled.

For example, the number of internal teeth 44a of the center gear 41 and the ring gear 44 is set to ZS1, ZS2 (ZS1 <
Suppose that the central 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 planetary frame 43 is as follows: nA1 = nS1 / (1+ (ZS2 / ZS1)) (1)

Conversely, when the ring gear 44 is given a rotation speed of nS2 without rotating the center gear 41, the planetary frame 43
Is the rotation speed nA2 of nA2 = nS2 / (1+ (ZS1 / ZS2)) (2)

Therefore, the center gear 41, the ring gear 4
4 are nS1 and nS2 respectively, the planetary frame 4
Since the rotation speed nA of 3 is nA = nA1 + nA2 (3), from the equations (1), (2) and (3), nA = nS1 / (1+ (ZS2 / ZS1)) + nS2 /
(1+ (ZS1 / ZS2)). Therefore, since nS1, ZS1, and ZS2 are constant, the rotation speed (= nA) of the output shaft 20 changes according to the rotation speed nS2 of the ring gear 44.

As described above, by the planetary gear mechanism 40,
By simply adjusting the speed of the hydraulic motor 53 driven by the drive shaft 10 rotating at a constant speed, the rotation of the output shaft 20 transmitted from the drive shaft 10 can be changed. Further, the oil supply pump 30 for supplying oil to the planetary gear mechanism 40 and the hydraulic motor 53
Can be driven by the rotation of the drive shaft 10, so that the structure is simple and the 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 ring gear 44 and can adjust the rotation speed, and is easier to maintain than the hydraulic motor 53. By using the electric motor 55, it is necessary to further provide a motor driving power source 56, but since the power required to rotate the ring gear 44 is small, the impeller variable speed is easy to maintain without increasing the size of the device. Implement a 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. Although the rotation speed of the output shaft 20 is controlled by adjusting the rotation speed of the hydraulic motor 53 in the above embodiment, the oil pressure of the oil pump 52 may be adjusted, or the rotation speed of the hydraulic motor 53 and the rotation speed of the oil pump 52 may be adjusted. The capacity may be adjusted together. Furthermore, a plurality of gear trains having different reduction ratios are provided, and by switching these, the ring gear 4
4 can also be adjusted. Further, the drive transmission system can be constituted not only by the gear train 54 but also by, for example, a belt or a chain.

[0023]

As described above, in the impeller variable speed pump according to the first aspect, the speed of the rotation of the drive shaft is changed and transmitted to the output shaft via the planetary gear mechanism, and the ring of the planetary gear mechanism is rotated. By adjusting the rotation of the gear, the rotation of the output shaft can be controlled without providing a large-scale device, so that the impeller variable speed pump can be installed and operated at low cost.

In the impeller variable speed pump according to the second aspect, the ring gear rotating means rotates the ring gear from the drive source via the drive transmission system, so that the ring gear is adjusted by adjusting the drive source or the drive transmission system. Can be adjusted, so that it is possible to obtain an impeller variable speed pump capable of efficiently controlling the rotation speed of the output shaft.

In the impeller variable speed pump according to the third aspect,
Since the ring gear provided with the external teeth is rotated via the gear train, the ring gear can be surely rotated.

In the impeller variable speed pump according to the fourth aspect,
In order to rotate the ring gear using the rotation of the drive shaft,
Since there is no need for a separate device to rotate the ring gear,
Installation costs and operating costs can be reduced.

In the impeller variable speed pump according to the fifth aspect, the ring gear, which can be rotated without requiring large power, is rotated by the electric motor, so that maintenance is easy and the cost is reduced. 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 Center gear 42 Planetary gear 43 Planetary frame 44 Ring gear 44a Internal tooth 44b External tooth 50 Ring gear rotating means 51 Control means 52 Oil pump (drive source) 53 Hydraulic motor (drive source) 54 Gear train (drive transmission system) 30a, 54a, 54b Gear 55 Electric motor (drive source) 56 Power supply for motor drive E Motor S pump

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F04D 15/00 F04D 15/00 F 3J053 29/00 29/00 Z F16H 3/72 F16H 3/72 A 61 / 42 61/42 Z F term (reference) 3H020 AA01 BA04 BA06 BA18 CA01 CA04 DA04 DA07 3H022 AA01 BA03 CA06 DA09 DA20 3H045 AA06 AA08 AA09 AA12 AA23 BA12 BA19 BA20 BA28 CA01 CA03 CA06 DA05 DA10 3H075 AA06 BB08 DB21 EE03 EE12 EE13 EE17 3J028 EB10 EB35 EB37 EB63 FB03 FB13 FC13 FC23 FC62 FD11 GA40 3J053 AB01 AB32 DA21 DA30

Claims (5)

[Claims] 1. An impeller variable speed pump for variably transmitting a rotation speed from a drive shaft rotating at a constant speed to an output shaft for driving a pump impeller, wherein rotation of the drive shaft is transmitted to the output shaft. A planetary gear mechanism, a ring gear rotating means for rotating a ring 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 ring gear by the ring gear rotating means. Control means for changing the speed to a variable speed. 2. The impeller variable speed pump according to claim 1, wherein the ring gear rotating means rotates the ring gear from a drive source via a drive transmission system. 3. An impeller variable speed pump according to claim 2, wherein said ring gear is provided with external teeth, and said drive transmission system is a gear train for rotating said external teeth. 4. 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 4. 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 ring gear by adjusting at least one of the rotation speeds of the impeller. 5. The driving source includes an electric motor, and the control means controls a rotation speed of the output shaft by adjusting a rotation speed of the ring gear by adjusting a rotation speed of the electric motor. The impeller variable speed pump according to claim 2 or 3, wherein: