JPS6196193A - Driving gear of single-shaft eccentric screw pump - Google Patents

Abstract

PURPOSE:To obtain a driving gear having good efficiency by transmitting to be backed up the driving force for the exclusive use of starting via a cam-clutch mechanism to a single-shaft eccentric screw pump at the time of starting. CONSTITUTION:A motor shaft 14a for running is connected to a driving shaft 2 of a single-shaft eccentric screw pump via a cam-clutch mechanism 17. To this cam-clutch mechanism, an auxiliary power transmitting gear for the exclusive use of starting, for example, a manually operated handwheel etc. is connected via a speed up gears 26. Thus, since it is not necessary to use a large capacity running motor to meet starting torque and it becomes sufficient to use a small capacity motor, the running cost and the cost of equipment can be reduced.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is characterized in that a female threaded hole formed in a stator is formed as an inner surface with an oval cross section on an engaging surface for a male threaded rotor, and the male threaded rotor is provided with an eccentric shape. The present invention relates to a drive device for a single-shaft eccentric screw pump that engages and rotates around a core rotor shaft, and the pump is used, for example, as a pump for deep wells.

(Prior Art) This type of pump has the above-described structure, and since the male-threaded rotor rotates eccentrically, it is usually configured to transmit the rotation of the drive shaft to the eccentric rotor shaft via a universal joint. There is.

Incidentally, a male-threaded rotor performs a pumping action by engaging and rotating with the female thread of the stator and the wall surface of the threaded hole, but when the rotor is stationary, the stator, which is made of a hard elastic member, firmly engages with the rotor due to its elastic force. Because of this, the static friction between the two was enormous, and Rogue's starting power required approximately twice the running power.

Fig. 7 shows a conventional general eccentric shaft screw pump for deep wells, but only one drive device A is used as its drive source, and therefore a large drive capacity is required when starting the pump. The drive device A needed to be large.

(Problems to be Solved by the Invention) ``The above-mentioned single-shaft eccentric screw pump for deep wells is installed in large numbers mainly in developing countries such as countries in the Middle East. However, in these countries, the power supply is insufficient, so when the drive device is an electric motor, solar cells are often used as the power source, but solar cells with a large power capacity are very expensive. Furthermore, during running operation, only approximately half of the capacity of the drive device and solar cell is used, resulting in a large amount of waste.

Furthermore, some pumps of this type have a structure in which the rotor is driven by rotating a manual handle without using a drive device, but in the case of this structure, everything is done manually, so there is no work required. This method has disadvantages in that it is difficult to pump, which places a heavy burden on the user, and it is not suitable for pumping up large amounts of water.

This invention was made in view of the above points.The driving force required when starting the pump is small, and a dedicated drive device is used during running operation. It is an object of the present invention to provide a drive device for an eccentric screw pump.

(Means for Solving the Problems) This invention connects the output shaft of a drive device exclusively for running to the end of the drive shaft connected to the eccentric rotor shaft of a -axis eccentric screw pump, and the drive shaft is in a stopped state. Equipped with a cam clutch mechanism that rotates in conjunction with the drive shaft only during the period from 1 to the start state, and when the pump is started, the driving force exclusively for starting can be auxiliary transmitted to the drive shaft via the cam clutch mechanism. The gist is what has been constructed.

(Function) According to the pump drive device of the present invention, at the time of startup, the rotor is driven by transmitting manual force or the drive force of a small capacity drive device equipped with a speed reduction mechanism to the drive shaft, and After the rotor starts to drive, the connection between the drive source dedicated to starting and the drive shaft is automatically released, and the rotor is driven by a dedicated drive device to perform running operation.

(Example) Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 to 5, a drive shaft 2 is rotatably disposed at the axial center of a cylindrical casing 1 serving as a suction pipe buried underground. A male-threaded rotor 5 is eccentrically connected to the end surface of the rotor 5 at the tip of the drive shaft 2 via a connecting shaft 3 having universal joints 4 attached to both ends.

Reference numeral 6 denotes a stator made of a hard elastic member in which a spiral female threaded hole 7 having an oval cross section is formed. It is well equipped.

Further, a nimple 8 having a suction port 9 is attached to the tip of the casing 1, and a sphere 10 is placed on the suction port 9 in the casing 1 so that the suction port 9 can be opened and closed.

Reference numeral 11 denotes a pump housing constituting the above-ground part. A discharge pipe 12 is provided laterally protruding from the middle part of the housing 11, and the inner opening of the discharge pipe 12 is a closed cavity separating the upper and lower parts of the housing 11. It communicates with the upper end opening of the casing 1 via 13. Reference numeral 14 indicates an electric motor as a driving device exclusively for running, which is installed at the upper end of the housing 11, and reference numeral 15 indicates a manually rotating handle for starting the pump.

As shown in FIG. 1, an output shaft 14a of the electric motor 14 is connected to the drive shaft 2 by a drive connection shaft 16. 17 is a known force clutch mechanism that rotates in conjunction with the drive shaft 2 only when the rotation speed of the drive shaft 2 is below a predetermined rotation speed, and this cam clutch mechanism 17 is attached to the middle part of the drive connection shaft 16. be done. As shown in FIGS. 3 and 5, for example, the cam clutch mechanism 17 includes an inner ring 19 rotatably disposed concentrically with respect to an outer ring 18, and an intermediate ring 19 disposed in an annular gap between inner and outer gastric rings 18 and 19. 20 wheels imported 18
The substantially fan-shaped cam 2 is fixedly interposed in a plurality of recesses 21 that are equally spaced in the circumferential direction of the intermediate ring 20.
2 is pivotally mounted so as to be horizontally swingable, and is urged toward the inner ring 19 by a sprung ring 23.

Therefore, when the outer ring 18 is stopped or at a rotation speed below a predetermined speed (at least until it is started), the fan-shaped cam 22
The inner and outer rings 18 and 19 are integrally rotated in conjunction with each other (see Fig. 5a), but when the rotational speed of the outer ring 18 exceeds a predetermined rotational speed, each fan-shaped cam 22 is rotated by the spring 23 due to centrifugal force. The structure is such that the outer ring 18 only rotates (FIG. 5b), as the outer ring 18 swings outward to release contact with the inner ring 19.

By the way, the outer ring 18 is mounted so as to be able to rotate integrally with the drive connection shaft 16, while the inner ring 19 is attached to the drive connection shaft 16.
It is arranged so that it can rotate freely.

Further, a screw gear 24 is fixed to the upper part of the inner ring 19.

Furthermore, 25 is a screw gear that meshes orthogonally with the screw gear 24, and this screw gear 25 is an intermediate shaft that is arranged to be rotatable laterally with respect to the housing 11 together with the rotary ring 15a of the manual handle 15. 25a, and a gear 26 as a speed increasing device is installed between the rotary shaft 15a and the intermediate shaft 25a, and increases the rotational speed of the handle 15 to rotate the inner ring 19 of the cam clutch mechanism 17. It is configured to allow
1. In the figure, 27 indicates a bearing.

Next, the operation of the above embodiment will be explained. first,
To start the pump, by rotating the manual handle 15, this rotational force is increased and the cam clutch mechanism 1 is activated.
The drive shaft 2 rotates via the rotor 7, and at the same time the rotor 4 starts rotating.

If the electric motor 14 is driven in this state, the rotor 4 will be rotated by the electric motor 14 since the rotor 4 has already started rotating. In other words, when the rotor 4 reaches a predetermined rotational speed or higher, the fan-shaped cam 22 of the cam clutch mechanism 17 swings outward against the spring 23, and the connection between the inner and outer rings 18 and 19 is released. As a result, the transmission of rotational force between the handle 15 and the drive shaft 2 is released, and the handle 1 is manually operated.
When the rotation of the handle 15 is stopped, the handle 15 comes to a stopped state. Therefore, from now on, the rotor 4 is rotated only by the electric motor 14.

Under this condition, a pumping action is performed by the engagement between the rotor 4 and the female threaded hole 8 of the stator 7, the sphere 10 floats up by suction, the suction port 9 opens, and groundwater is sucked into the casing 1. It passes through the casing 1 and is discharged from the upper discharge pipe 12.

In addition, when pumping a small amount of water or when the electric motor 14 cannot be used due to a malfunction, the manual handle 15
Water can be pumped up by rotating it. Also,
In this embodiment, a speed increasing device 26 is interposed between the rotating shaft 15a of the handle and the intermediate shaft 25a so that water can be pumped up using only the manual handle 15, but the speed increasing device 26 may be omitted or replaced. A speed reduction device can also be used instead.

FIG. 6 shows another embodiment, in which the manual handle 15
The difference is that an electric motor 35 with a speed reduction mechanism 35a dedicated to starting the pump is provided instead, and the speed increase device 26 between the rotating shaft 15a and the intermediate shaft 25a is replaced with a speed reduction device 36. Therefore, in this second embodiment, after the electric motor 35 starts the pump, the electric motor 1
4 allows the pump to run.

A sequence circuit is provided so that after a certain period of time has elapsed since the starting electric motor 35 starts rotating, the running electric motor 14 automatically starts rotating and the electric motor 35 stops rotating. (And convenient.

(Effects) As explained above, since the drive device for the eccentric pump of the present invention has the above-described configuration, it produces the following effects.

(1) Since the pump starting operation can be performed using a drive source exclusively for starting, a dedicated drive device can be used for running operation, and the capacity of the drive device can be reduced to about half that of conventional drive devices, making it economical. It is.

(2) If a manual handle rotation drive mechanism is used as a drive source exclusively for starting, it becomes possible to pump water only by manual operation, which is convenient.

(3) Even when a drive device such as an electric motor is used as a drive source exclusively for starting, the driving force of the drive device can be significantly reduced by a speed reduction device to increase torque.
An extremely small-capacity drive device can be used, so even when combined with a running-only drive device, the capacity can be considerably smaller than that of conventional drive devices, and at the same time, the capacity of the power source for driving the drive device can also be reduced accordingly. This is particularly effective when using expensive solar cells.

[Brief explanation of the drawing]

FIG. 1 is an overall vertical sectional view showing an embodiment of the present invention, FIG. 2 is a partial side view of FIG. 1, FIG. 3 is a sectional view taken along the line ■-■ in FIG. 2, and FIG. 5A and 5A are partial sectional views of the cam clutch mechanism, FIG. FIG. 7 is an overall schematic sectional view of a conventional general deep well pump. DESCRIPTION OF SYMBOLS 1... Cylindrical casing, 2... Drive shaft, 5... Male screw rotor, 6... Stator, 7... Female thread hole, 14... Electric motor, 15... Manual handle,
17... Cam clutch mechanism, 26... Speed increase device, 3
5...Electric motor, 36...Reduction device. Sorrow

Claims (3)

[Claims] (1) In a uniaxial eccentric screw pump in which the internal threaded hole formed in the stator is formed as an inner surface with an oval cross-sectional shape on the engagement surface for the male threaded rotor, and the male threaded rotor engages and rotates around the eccentric rotor shaft. The output shaft of the running drive device is connected to the end of the drive shaft serving as the eccentric rotor shaft, and a cam clutch mechanism is provided that rotates in conjunction with the drive shaft only while the drive shaft changes from a stopped state to at least a starting state. 1. A drive device for a uniaxial eccentric screw pump, characterized in that a driving force for starting can be transmitted to a drive shaft through the drive shaft. (2) The drive device for a uniaxial eccentric screw pump according to claim 1, wherein the starting driving force is a manual force, and the manual force is generated by rotating a handle. (3) The drive device for a uniaxial eccentric screw pump according to claim 1, wherein the starting driving force is an electric force, and the electric force is generated by an electric motor with a speed reduction mechanism.