JP2001336480A - Pump drive mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a mechanism capable of performing the drive of a water supply pump 3 without using wastful energy with a low cost and lower the cost and time for repairing in case of out of order. SOLUTION: A toroidal type stepless regulator 2 is installed between a water supply pump 3 and an electric motor 1. The water supply quantity can be changed by changing the transmission ratio of the toroidal type stepless regulator 2 while conducting the constant-speed operation of an electric motor 1. Also the abnormality of the toroidal type stepless regulator 2 can freely be detected by a sensor such as a acceleration pick-up sensor 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The pump driving apparatus according to the present invention is installed, for example, in a basement room of a building, and is used for lifting water used in the building into a water supply tank installed on the roof of the building. Alternatively, it can be used for various purposes such as pumping water into agricultural or industrial reservoirs or water tanks.

[0002]

2. Description of the Related Art For example, in the case of a building, it is impossible to directly supply water to an upper floor by the pressure of water flowing in an underground water pipe. For this reason, in the case of a general building, a water storage tank and a water pump are provided in the basement, and water injected into the water storage tank from the water supply is transferred to another water tank installed on the roof by the water pump. The water used in the building is supplied from the water tank installed on the roof to each floor using the head pressure. Incidentally, as a pump used in such a case, a turbo-type pump (particularly, a centrifugal pump) such as a centrifugal pump, a mixed flow pump, and an axial flow pump is generally used.

[0003] As a method for changing the amount of water sent to a rooftop water storage tank or the like with the above-described water pump, a "fluid machine handbook" issued by Asakura Shoten, for example, has conventionally been used.
And the like, the following methods are known. The opening of the flow control valve provided between the pump and the water storage tank is changed. A plurality of pumps are provided in parallel with each other, and the number of pumps operating simultaneously is changed. The rotation speed of the electric motor for rotating the pump is changed.

[0004]

In the case of any of the above-mentioned methods (1) to (4), the energy required to operate the water pump when the amount of water supply is reduced is wasted. That is, as described in the above-mentioned "Fluid Machine Handbook", even if the opening of the flow control valve is reduced to reduce the amount of water supply, the power required to drive the pump is still the amount of water supplied. Is not so small as to reduce the energy, and energy is wasted correspondingly.

In the case of the method (1), it is necessary to install a plurality of pumps which may be operated at the same time. In order to control the rotation of the motor, a large-sized inverter facility is required, which causes a problem such as an increase in cost (in the case). The present invention has been made in view of the above circumstances, by changing the operating speed of the pump while the driving source such as the electric motor is operated at a constant speed, even if the flow path on the downstream side of the pump is not restricted by the flow control valve. The present invention has been made in order to realize a pump driving device capable of freely adjusting a water supply amount and improving energy efficiency when the water supply amount is reduced. At the same time, the present invention aims to reduce the cost and time required for repair by minimizing damage to components even in the event of a failure.

[0006]

A pump driving apparatus according to the present invention comprises a driving source such as an electric motor or an engine and a pump driven by the driving source, similarly to a conventionally known pump driving apparatus. And In particular, in the pump drive device of the present invention, a toroidal-type continuously variable transmission or a toroidal-type continuously variable transmission that can continuously change the gear ratio is incorporated between the pump and the drive source. A continuously variable transmission is arranged. The drive shaft of the drive source and the input of the toroidal-type continuously variable transmission or the continuously variable transmission are connected to the output of the toroidal-type continuously variable transmission or the continuously variable transmission and the rotary shaft of the pump. , Respectively, so as to freely transmit the rotational force. Further, there is provided an abnormality detecting means for detecting an abnormality occurring in the toroidal type continuously variable transmission.

[0007]

In the case of the pump driving apparatus of the present invention constructed as described above, the toroidal type continuously variable transmission or the toroidal type continuously variable transmission is operated while the driving sources such as the electric motor and the engine are operated at a constant speed. By changing the gear ratio of the continuously variable transmission incorporating the above, the operating speed of the pump can be changed and the amount of water supplied by the pump can be adjusted. For this reason, wasteful energy consumption can be eliminated by making the amount of water supplied and the energy required for the operation of the pump substantially proportional. In addition, since a plurality of pumps and a large-sized inverter that operate at the same time are not required, there is no increase in equipment cost and installation space. Furthermore, since the abnormality detecting means for detecting an abnormality of the toroidal-type continuously variable transmission is provided, when the toroidal-type continuously variable transmission fails, it is possible to immediately take measures such as stopping the drive source. For this reason, it is possible to prevent the toroidal-type continuously variable transmission from being greatly damaged, or the drive source and the pump from being damaged.

[0008]

FIG. 1 shows a first example of an embodiment of the present invention corresponding to claims 1 and 2. In the pump drive device of the present example, an electric motor 1, which is a drive source, a toroidal-type continuously variable transmission 2, and a water pump 3 are arranged in series with each other in the direction of power transmission. That is, the drive shaft 4 of the electric motor 1 and the input shaft 5 which is an input part of the toroidal type continuously variable transmission 2 are coaxially connected to each other. An output gear 6 which is an output part of the toroidal type continuously variable transmission 2 and a rotating shaft 7 of the water supply pump 3 are
They are connected via a transmission gear 8.

The toroidal-type continuously variable transmission 2 is disclosed, for example, in Japanese Utility Model Laid-Open No. 62-71465 and Japanese Utility Model Application No. 63-6929.
No. 3 (Japanese Utility Model Laid-Open No. 1-173552), JP-A-1-169169, and 1-31-2226.
No. 6, No. 10-196759, No. 11-63
It is described in a number of documents such as Japanese Patent No. 146, and is widely known in the past. In the illustrated example, as the toroidal-type continuously variable transmission 2, a so-called double cavity in which two input-side disks 9 and 9 and two output-side disks 10 and 10 are arranged in parallel with each other in the power transmission direction. I am using a type. Power rollers 11 and 11 (see FIG. 4 showing an embodiment to be described later; omitted in other drawings) are provided between the input disks 9 and 9 and the output disks 10 and 10, respectively. Multiple pieces are pinched. When the drive shaft 4 of the electric motor 1 rotates, the input disks 9, 9 rotate while being pressed by the output disks 10, 10 by the action of a pressing device such as a loading cam device. Then, the rotation of each of the input-side disks 9, 9 is transmitted to the output-side disks 10, 10 via the power rollers 11, 11. The rotation of each of the output-side disks 10 and 10 is taken out from the output gear 6 and drives the water supply pump 3 to rotate.

On the outer surface of the casing 12 accommodating the toroidal type continuously variable transmission 2 described above, an acceleration pickup 13 which is a sensor for detecting the state of the toroidal type continuously variable transmission 2 is installed. . A detection signal of the acceleration pickup 13 is transmitted to a controller 14 having a built-in microcomputer for controlling the electric motor 1.
Are input as indicated by arrows in FIG. This controller 1
Reference numeral 4 denotes a control signal also indicated by an arrow in FIG. 4 to the electric motor 1 when the value of the vibration of the casing 12 detected by the acceleration pickup 13 exceeds a predetermined value. Power supply to 1 is stopped.
That is, as shown in FIG. 2, the controller 14 compares the measured value of the vibration shown by the curve a in the figure with the set value shown by the straight line b in the figure. Then, when the measured value exceeds the set value, the electric motor 1 is stopped.

In the case of the pump driving apparatus of the present embodiment constructed as described above, the speed ratio of the toroidal-type continuously variable transmission 2 is changed while the electric motor 1 is operated at a constant speed. By changing the operation speed of the water supply pump 3, the amount of water supplied by the water supply pump 3 can be adjusted. That is, the amount of water supply is substantially proportional to the rotation speed of the water supply pump 3 and the rotation speed of the water supply pump 3 is proportional to the rotation speed of the output gear 6. By adjusting by changing the gear ratio of the step transmission 2,
The water supply amount can be adjusted without changing the rotation speed of the drive shaft 4 of the electric motor 1.

For example, the peripheral surface of each of the power rollers 11, 11 is brought into contact with a portion near the inner diameter of each of the input disks 9, 9 and a portion near the outer diameter of each of the output disks 10, 10, If the speed ratio of the toroidal-type continuously variable transmission 2 is set on the reduction side, the water supply amount can be reduced. In this state, the torque required to rotationally drive the input shaft 5 of the toroidal type continuously variable transmission 2 is small, and the amount of electricity to the electric motor 1 is small. On the other hand, the peripheral surface of each of the power rollers 11 and 11 is provided with a portion near the outer diameter of each of the input disks 9 and 9 and each of the output disks 1 and 9.
The water supply amount can be increased by bringing the toroidal type continuously variable transmission 2 into contact with the inner diameter portions 0 and 10 and increasing the speed ratio of the toroidal-type continuously variable transmission 2 to the speed increasing side. In this state, the torque required to rotationally drive the input shaft 5 of the toroidal-type continuously variable transmission 2 increases, and the amount of power to the electric motor 1 increases.

Next, FIG. 3 corresponds to claims 1 and 2.
9 shows a second example of the embodiment of the present invention. In the case of this example, a signal indicating the rotation speed of the electric motor 1 and a signal indicating the rotation speed of the water pump 3 are input to a controller 14 for controlling the electric motor 1. Then, the controller 14 determines whether at least one of the rotation speed of the electric motor 1 and the rotation speed of the water supply pump 3 becomes an abnormal value, or when there is no consistency between these two rotation speeds. Then, the electric motor 1 is stopped.

That is, the input side of the toroidal type continuously variable transmission 2 provided between the electric motor 1 and the water pump 3,
Output side disks 9 and 10 and power rollers 11 and 11
When a slippage occurs in the contact portion with FIG. 4 (FIG. 4), the rotation speed of the electric motor 1 sharply increases (blows up).
At the same time, the rotation speed of the water pump 3 suddenly decreases (further stops). In such a case, the controller 14 stops energizing the electric motor 1, so that the electric motor 1 can be prevented from being damaged.

Further, when an abnormality occurs in the control hydraulic system for performing the shift control of the toroidal type continuously variable transmission 2, the shift control of the toroidal type continuously variable transmission 2 cannot be performed. In this case, the rotation speed of the electric motor 1 and the rotation speed of the water pump 3 or the controller 14
In this case, the electric motor 1 is stopped even in such a case, because there is no consistency between the command value and the actual rotational speed. In order to detect the abnormality of the toroidal-type continuously variable transmission 2 by measuring the rotation speed of a predetermined portion in this way, as shown in the drawing, the rotation speed of the electric motor 1 and the rotation speed of the water pump 3 are determined. In addition to detecting the rotation speed, the rotation speed of another portion may be detected. For example, instead of the rotational speed of the electric motor 1, the input shaft 5 of the toroidal type continuously variable transmission 2, the input disks 9, 9, and the loading cam 16 of the pressing device 15 are used.
And the like can be detected. Instead of the rotation speed of the water pump 3, the rotation speed of the output gear 6 or the output disks 10, 10 of the toroidal-type continuously variable transmission 2 may be detected.

Next, FIG. 4 corresponds to claims 1 and 2.
13 shows a third example of the embodiment of the present invention. In the case of this example, a sensor 17 for detecting the inclination angle of the power roller 11 constituting the toroidal type continuously variable transmission 2 is provided. The detection signal from the sensor 17 is input to a controller 14 for controlling the electric motor 1. And
When the consistency between the detection signal of the sensor 17 and the command value is lost, the controller 14 controls the electric motor 1
To stop.

That is, the toroidal type continuously variable transmission 2 includes:
In order to adjust the gear ratio in accordance with the target value of the rotation speed of the water supply pump 3, the inclination angle of each of the power rollers 11, 11 is adjusted. It is probable that a failure occurred. Therefore, in such a case, the electric motor 1 is stopped to prevent the failure from spreading. In the illustrated example, the sensor 17
Is provided only on one power roller 11, but all the power rollers 11, 11 are provided with sensors 17 so that it is possible to determine whether or not these power rollers 11, 11 are inclined in synchronization. You can do it. That is, in order to stably transmit power between the input-side disks 9 and 9 and the output-side disks 10 and 10, all the power rollers 11 and 11 need to be tilted synchronously. is there. Therefore,
The inclination of one of the power rollers 11 is different from that of the other power roller 1.
If not synchronized with 1 and 11, the water pump 3
To stop the failure from spreading.

Next, FIG. 5 corresponds to claims 1-3.
14 shows a fourth example of an embodiment of the present invention. In the case of this example, the electric motors 1 and 1 and the toroidal-type continuously variable transmission 2
2 and two sets of water pumps 3 and 3 are installed in parallel with each other. And each of these toroidal type continuously variable transmissions 2, 2
Acceleration pickups 13, 1
3, and the detection signals of the respective acceleration pickups 13, 13 are input to a controller 14 for controlling the electric motors 1, 1. The controller 14 controls one of the pair of electric motors 1, 1.
While driving only the other electric motor 1 and stopping the other electric motor 1, water is supplied from one of the water supply pumps 3 to the upper water storage tank 19 from the lower water storage tank 18, as indicated by a broken line arrow in FIG.

In the case of this embodiment having such a configuration, when an abnormality occurs in one of the sets of the toroidal type continuously variable transmission 2 used for water supply from the lower water storage tank 18 to the upper water storage tank 19 at that time. Then, the one set of the electric motors 1 is stopped, and the other set of the electric motors 1 which has been stopped is activated. For this reason, in the case of this example, the supply of water to the upper water storage tank 19 is stopped, and it is possible to prevent a building or the like in which the upper water storage tank 19 is installed from being cut off. In addition, the structure of this example can also be implemented by a structure in which three or more sets of the electric motors 1, 1 and the toroidal-type continuously variable transmissions 2, 2 and the water pumps 3, 3 are installed in parallel with each other.

The abnormality detecting means for detecting an abnormality occurring in the toroidal-type continuously variable transmission includes acceleration (vibration), rotation speed of the input / output unit, rotation speed of the input / output unit as described in each of the above embodiments. The present invention is not limited to the one that detects the inclination angle of the power roller, and the one that detects the following (1) to (4) can also be adopted. Oil temperature Lubricating oil (traction oil) is continuously supplied and discharged inside the toroidal type continuously variable transmission to ensure lubrication and transmission efficiency. However, internal bearings may be damaged,
If the contact state between each output side disk and the power roller becomes poor, the temperature of the discharged oil increases due to the increase in the internal temperature caused by the increase in the frictional heat. Therefore, by continuously observing the temperature of the discharged oil or observing the difference between the temperature of the supplied oil and the temperature of the discharged oil, it is possible to detect the occurrence of an abnormality. That is, when an abnormality occurs, the drive source such as the electric motor is stopped because the discharged oil temperature rises rapidly or the difference between the supply oil temperature and the discharged oil temperature becomes large. Driving Torque of Electric Motor When the toroidal type continuously variable transmission is damaged, the torque required to drive the toroidal type continuously variable transmission increases. Therefore, when the driving torque of the electric motor becomes larger than the water supply amount, it is determined that an abnormality has occurred in the toroidal-type continuously variable transmission, and the driving source such as the electric motor is stopped. To change the gear ratio of the control hydraulic toroidal-type continuously variable transmission, the above-described Japanese Utility Model Application No. 63-69293 (Japanese Utility Model Application Laid-Open No. 1-173552) is used.
As described in many documents such as the microfilm of No. 1), a trunnion supporting a power roller is translated by a hydraulic cylinder. Therefore, in order to change the gear ratio appropriately, the hydraulic pressure supplied to and discharged from the hydraulic cylinder must be appropriate. If an abnormality such as a failure of a pump for generating pressure oil or a blockage of an oil supply passage for supplying / discharging the pressure oil to / from the hydraulic cylinder occurs, the gear ratio cannot be controlled. Then, it is determined whether or not the hydraulic pressure of the hydraulic cylinder portion is appropriate. If it is determined that the hydraulic pressure is not appropriate, the drive source such as the electric motor is stopped. Abnormal signal output from the water pump If foreign matter is clogged or seized in the water pump, if operation is continued as it is, excessive torque exceeding the designed value will be applied to the toroidal type continuously variable transmission and drive source, and these toroidal type It also damages the step transmission and the drive source.
Therefore, a sensor is installed in the water supply pump, and when the rotation torque, the flow rate, or the acceleration (vibration) of the water supply pump becomes an abnormal value, the drive source such as the electric motor is stopped.

The above description has been made on the case where the toroidal type continuously variable transmission is used alone as the continuously variable transmission constituting the pump driving device of the present invention. In the case where the driving torque is small, for example, when driving a motor, a continuously variable transmission having another structure such as a belt-type continuously variable transmission can be used. Alternatively, when the driving torque is particularly large, for example, when a large water pump is rotated at a high speed, as described in Japanese Patent Application Laid-Open No. H10-196759, a toroidal-type continuously variable transmission and a planetary gear are used. A continuously variable transmission called a power circulation type, which is combined with a gear mechanism, can also be used.

Further, the structure for detecting the abnormality of the toroidal-type continuously variable transmission and stopping the drive source to prevent the failure from expanding, as in the respective examples shown in the drawings, includes a water pump such as a water pump using an electric motor or an engine. The present invention can be applied not only to the apparatus for driving the pump described above, but also to a toroidal type continuously variable transmission used as an automatic transmission for an automobile and also as a transmission for another general machine such as a machine tool. In this case, when an abnormality occurs in the toroidal-type continuously variable transmission, the coupling between the toroidal-type continuously variable transmission and the traveling engine is cut off to prevent the engine from being damaged. Alternatively, the coupling between the toroidal-type continuously variable transmission and the driving wheels is cut off, and the driving wheels are locked to prevent the running stability from being impaired.

[0023]

Since the present invention is constructed and operates as described above, it can be easily installed in a small space at low cost.
Moreover, it is possible to realize a pump drive device that requires less energy during operation. Further, even when a failure occurs, the cost and time required for repair can be reduced by minimizing damage to the components.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first example of an embodiment of the present invention.

FIG. 2 is a diagram showing a vibration level detected by an acceleration pickup and a reference value;

FIG. 3 is a schematic sectional view showing a second example of the embodiment of the present invention.

FIG. 4 is a schematic sectional view showing the third example.

FIG. 5 is a schematic sectional view showing the fourth example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric motor 2 Toroidal type continuously variable transmission 3 Water pump 4 Drive shaft 5 Input shaft 6 Output gear 7 Rotating shaft 8 Transmission gear 9 Input side disk 10 Output side disk 11 Power roller 12 Casing 13 Acceleration pickup 14 Controller 15 Pressing device 16 Loading cam 17 Sensor 18 Lower water storage tank 19 Upper water storage tank

 ────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takashi Imanishi 1-5-50 Kugenuma Shinmei, Fujisawa-shi, Kanagawa F-term in NSK Ltd. (reference) 3H045 AA06 AA09 AA12 AA16 AA23 BA19 BA41 CA00 CA09 CA12 CA22 CA29 DA02 EA38 3H075 AA06 CC25 CC37 DB22 DB32 EE02 EE04 EE06 EE12 3J051 AA03 BA03 BD01 BE09 CA05 CB07 ED11 FA10

Claims (3)

[Claims] 1. A pump drive device comprising a drive source and a pump rotated by the drive source, wherein a toroidal-type continuously variable transmission or a toroidal-type continuously variable transmission is provided between the pump and the drive source. A continuously variable transmission incorporating a transmission is disposed, and the drive shaft of the drive source and an input portion of the toroidal type continuously variable transmission or the continuously variable transmission are connected to the toroidal type continuously variable transmission or the continuously variable transmission. And the rotary shaft of the pump are connected to each other so as to be able to transmit rotational force, and abnormality detecting means for detecting an abnormality occurring in the toroidal type continuously variable transmission is provided. Characteristic pump drive. 2. A toroidal-type continuously variable transmission having a sensor for detecting a state of the toroidal-type continuously variable transmission, and a drive source when a detection value of the sensor exceeds a predetermined value. The pump driving device according to claim 1, wherein the pump driving device is stopped. 3. A drive source and two sets of a toroidal type continuously variable transmission or a continuously variable transmission and a pump are installed in parallel with each other, and when an abnormality occurs in one of the sets, the drive source of the one set is used. 3. The pump driving device according to claim 2, wherein the driving of the other set is stopped and the other set of driving sources which has been stopped is activated.