JPS636759B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) This invention provides a female threaded hole formed in a stator with an oval cross-sectional inner surface on the engagement surface for a male threaded rotor, and the male threaded rotor has an eccentric A drive device for a uniaxial eccentric screw pump that engages and rotates around a rotor shaft,
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.

By the way, the male-threaded rotor performs a pumping action by engaging and rotating with the wall surface of the female-threaded hole in the stator, but when the rotor is stationary, the stator, which is made of a hard elastic member, is firmly connected to the rotor due to its elastic force. The static friction force between the two was large, and the starting force of the rotor required approximately twice the running power.

FIG. 7 shows a conventional single-shaft eccentric screw pump for deep wells, but only one drive unit A is used as the 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 if the drive device is an electric motor,
Solar cells are often used as a power source, but solar cells with a large power capacity are very expensive, and during running operation, only about half of the capacity of the drive unit and solar cells are used, which is wasteful. The disadvantage was that there were a lot of

Furthermore, some pumps of this type have a structure in which the rotor is driven by rotating a manual handle using a drive device, but in the case of this structure, everything is done manually, so It is difficult to work and puts 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 running-only drive device to the end of the drive shaft connected to the eccentric rotor shaft of a single-shaft eccentric screw pump, and also enables the drive shaft to move from a stopped state. A cam clutch mechanism is installed that rotates in conjunction with the drive shaft only while the pump is in the starting state, and a driving force exclusively for starting can be auxiliary transmitted to the drive shaft through the cam clutch mechanism when the pump is started. The main points are as follows.

(Function) According to the pump drive device of the present invention, at 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) Hereinafter, an example of the present invention will be described based on the drawings.

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

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 nipple 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.

11 is a pump housing that constitutes 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
The housing 11 communicates with the upper end opening of the casing 1 through a closed cavity 13 that separates the upper and lower parts of the housing 11 . 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.

Then, as shown in FIG.
The output shaft 14a of No. 4 is connected to the drive shaft 2 by a drive connection shaft 16. Reference numeral 17 denotes a known cam clutch mechanism that rotates in conjunction with the drive shaft 2 only when the rotation speed of the drive shaft 2 falls below a predetermined rotation speed.
It is attached to the middle part of the The cam clutch mechanism 17
For example, as shown in FIGS. 3 and 5, an inner ring 19 is rotatably arranged concentrically with respect to an outer ring 18, and an intermediate ring 20 is arranged between the outer ring 18 and the outer ring 18 within an annular gap between the inner and outer rings 18 and 19. A substantially sector-shaped cam 22 is pivotally mounted in a plurality of recesses 21 equally spaced in the circumferential direction of the intermediate ring 20 so as to be horizontally swingable, and is supported by a spring 23. It is biased toward the inner ring 19 side. Therefore, when the outer ring 18 is stopped or at a rotational speed lower than a predetermined speed (at least until it is started), the inner and outer rings 18 and 19 are integrally rotated together via the fan-shaped cam 22 (see FIG. 5a).
), but when the rotational speed of the outer ring 18 exceeds a predetermined rotational speed, each fan-shaped cam 22 swings outward against the spring 22 due to centrifugal force, and the contact with the inner ring 19 is released, and only the outer ring 18 The structure is such that it rotates (Fig. 5b).

By the way, the outer ring 18 is mounted to be rotatable integrally with respect to the drive connection shaft 16, while the inner ring 19 is arranged to be rotatable with respect to the drive connection shaft 16. Further, a screw gear 24 is fixed to the upper part of the inner ring 19.

Furthermore, 25 is a screw gear that meshes with the screw gear 24 orthogonally, and this screw gear 25 is connected to the housing 1 together with the rotating shaft 15a of the manual handle 15.
The handle 15 is mounted on an intermediate shaft 25a that is rotatably arranged laterally with respect to the handle 15, and a gear 26 is mounted as a speed increasing device between the rotating shaft 15a and the intermediate shaft 25a. The inner ring 19 of the cam clutch mechanism 17 is rotated by increasing the speed of the cam clutch mechanism 17.

In addition, 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, the rotational force is increased and the drive shaft 2 is rotated via the cam clutch mechanism 17, and at the same time, the rotor 4 starts rotating. If the electric motor 14 is driven in this state,
Since the rotor 4 has already started rotating, the rotor 4 is rotated by the electric motor 14.
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. , the transmission of rotational force between the handle 15 and the drive shaft 2 is released, and the handle 15 is manually operated.
When the rotation of the handle 15 is stopped, the handle 15 becomes in 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 action between the rotor 4 and the female threaded hole 8 of the stator 7, and the sphere 10 floats up by suction and the suction port 9
opens, groundwater is sucked into 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 failure or the like, water can be pumped by rotating only the manual handle 15. Further, 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 only by the manual handle 15, but the speed increasing device is omitted. Alternatively, a reduction gear can be used instead.

FIG. 6 shows another embodiment, in which the manual handle 15 is replaced by a deceleration mechanism 3 dedicated to starting the pump.
Along with deploying an electric motor 35 with 5a,
Speed increasing device 2 between the rotating shaft 15a and the intermediate shaft 25a
The difference is that 6 is replaced with a reduction gear 36. Therefore, in this second embodiment, after the electric motor 35 has started the pump, the electric motor 14 can cause 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 operation electric motor 14 automatically starts rotating and the electric motor 35 stops rotating. It is convenient.

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

(1) Since the pump can be started using a dedicated drive source for starting, a dedicated drive unit can be used for running operation, and the capacity of the drive unit can be reduced to about half that of conventional drive units, making it more economical. It is true.

(2) If a manual handle rotation drive mechanism is used as the 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 reduction gear to increase the torque, making it possible to drive with extremely small capacity. Therefore, 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 drive 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 invention, FIG. 2 is a partial side view of FIG. 1, and FIG. 3 is a second
4 is a sectional view taken along the line - in FIG. 3, FIGS. 5a and 5b are partial sectional views of the cam clutch mechanism, and FIG. FIG. 7 is a partial side view showing a cross section, and FIG. 7 is an overall schematic sectional view of a conventional general pump for deep wells. 1... Cylindrical casing, 2... Drive shaft, 5...
Male threaded rotor, 6... Stator, 7... Female threaded hole, 14... Electric motor, 15... Manual handle, 17... Cam clutch mechanism, 26... Speed increaser, 35... Electric motor, 36... Reduction device .

Claims (1)

[Claims] 1. A female threaded hole formed in the stator is formed as an inner surface with an oval cross-sectional shape on an engagement surface for a male threaded rotor, and the male threaded rotor has a uniaxial shaft that engages and rotates around an eccentric rotor axis. In the eccentric screw pump, the output shaft of the running drive device is connected to the end of the drive shaft serving as the eccentric rotor shaft, and the drive shaft rotates in conjunction with the drive shaft only while the drive shaft changes from a stopped state to at least a start-up state. A drive device for a single-shaft eccentric screw pump, characterized in that the driving force for starting can be transmitted to the drive shaft via a cam clutch mechanism. 2. The driving 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 electric power, and the electric force is generated by an electric motor with a speed reduction mechanism.