JP2001271764A - Single shaft eccentric screw pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single shaft eccentric screw pump capable of facilitating disassembly and assembly, and shortening a time for maintenance. SOLUTION: A geared motor having a hollow wheel shaft which is coaxially rotated while sliding a phase from a motor shaft is mounted on a pump, a hollow shaft is inserted and supported to the wheel shaft, and is fixed by a key and the like. A taper part of a flexible shaft is inserted into a taper hole disposed on one end part of the hollow shaft. A rod which is mounted on the flexible shaft, and which is inserted on the hollow shaft is fastened at the other end part of the hollow shaft by a bolt, and the flexible shaft is joined with the hollow shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a structure of a single-shaft eccentric screw pump.

[0002]

2. Description of the Related Art Conventionally, a uniaxial eccentric screw pump has been used to transfer a high-viscosity liquid or a solid mixture. FIG. 3 shows the structure of a conventional uniaxial eccentric screw pump. In the figure,
Reference numeral 1 denotes a stator supported by a pump casing and formed with internal threads. Reference numeral 2 denotes a stator that is fitted and engaged with the stator 1,
This is a rotor having an external screw that rotates eccentrically.

Reference numeral 3 denotes a flexible shaft, one end of which is connected to the rotor 2 by bolts or pins to be integrated. The other end of the bending shaft 3 is formed in a tapered shape, and the tapered portion is inserted into a tapered hole formed in the shaft 4,
It is pulled by the fastening bolt 5 and connected to the shaft 4.

[0004] The shaft 4 is connected to the output side of a motor 8 by a shaft coupling 6. Reference numeral 7 denotes the entire pump, and the motor 8 is attached to the pump 7 with a flange. A is a pump suction port, and B is a pump discharge port. With such a configuration, the rotor 2 is rotated via the shaft joint 6, the shaft 4, and the flexible shaft 3 by driving the motor 8.

[0005] Incidentally, this type of pump requires disassembly and maintenance. When disassembling the conventional uniaxial eccentric screw pump shown in FIG. 3, first, a fastening bolt is removed from a window (not shown) provided in the pump 7, and the coupling between the shaft coupling 6 and the shaft 4 is released. The motor 8 is removed from the pump 7 so that the shaft 4 is exposed.

Next, the tightening bolt 5 is loosened and extracted from the end face of the shaft 4, and the connection between the shaft 4 and the flexible shaft 3 is released. Then, after removing the base of the pump discharge port B, the rotor 2 having the flexible shaft 3 and the stator 1 are pulled out from the discharge port B. When assembling, an operation reverse to the above procedure is performed.

As described above, in the conventional single-shaft eccentric screw pump, it is necessary to remove and move the motor during disassembly and assembly. For this reason, in maintenance, the work of removing and fastening the fastening bolts between the shaft coupling and the shaft and the work of removing and attaching the motor have to be performed, and the time required for such work has been required.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the drawbacks of the related art, and can be easily disassembled and assembled.
An object of the present invention is to provide a single-shaft eccentric screw pump that can reduce the time required for maintenance.

[0009]

SUMMARY OF THE INVENTION In a uniaxial eccentric screw pump in which a rotor integrally having a flexible shaft is meshed with a stator and rotated, a geared motor having a hollow wheel shaft that rotates coaxially with a phase shifted from the motor shaft is used for the pump. Attached, the hollow shaft was inserted into the wheel shaft and fixed, and at the same time, the tapered portion of the flexible shaft was inserted into the tapered hole provided at one end of the hollow shaft, and the flexible shaft was mounted and inserted through the hollow shaft. Use the bolts to tighten the rod,
The other end of the hollow shaft was tightened to connect the flexible shaft to the hollow shaft.

Further, a hollow wheel shaft having a long dimension and having a tapered hole formed in an extended end portion is used, and a hollow shaft is also used. Further, the bolt receiver at the end of the hollow shaft is mounted so as to be exposed from the end of the wheel shaft.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a single-shaft eccentric screw pump according to the present invention. The same parts as those of the conventional type are denoted by the same reference numerals, and detailed description is omitted. 1 is a stator, 2 is a rotor, and 3 is a flexible shaft.

One end of the flexible shaft 3 is connected to the rotor 2 by bolts or pins, and is integrated with the rotor 2. Also,
The other end of the bending shaft 3 is formed in a tapered shape. 9
Is a rod mounted on the flexible shaft 3 by screwing and inserted through a hollow shaft described later.

A hollow shaft 10 has a tapered hole formed at one end, the tapered portion of the flexible shaft 3 is inserted, and a bolt receiver 12 is fixed at the other end. A tightening bolt 11 screwed to the tip of the rod 9 mounted on the flexible shaft 3 is received.
By screwing the fastening bolt 11, the rod 9
Is pulled, and the flexible shaft 3 is connected to the hollow shaft 10.

Reference numeral 18 denotes a geared motor mounted on a pump 17, which comprises a motor and a gear mechanism having a hollow wheel shaft 13 which is coaxially rotated with a phase shifted from the motor shaft. The wheel shaft 13 is supported by a gear case 14. The hollow shaft 10 is inserted into the wheel shaft 13 and fixed by a key stopper 15 or the like. The hollow shaft 10 is rotated integrally with the wheel shaft 13.

The end of the hollow shaft 10 is
3 to facilitate operation of the tightening bolt 11. With such a configuration, by rotating the geared motor 18, the wheel shaft 13,
The rotor 2 is rotated around the hollow shaft 10 and the flexible shaft 3.

Now, when disassembling the uniaxial eccentric screw pump of the present invention, the tightening bolt 11 can be suddenly loosened and pulled out. Thereby, the bending shaft 3 and the hollow shaft 1
0, the rotor 2 having the flexible shaft 3 integrated therewith, and the stator 1 with the base of the pump discharge port B removed.
It can be pulled out from the pump discharge port B. Note that the rod 9 is also pulled out together with the bending shaft 3.

At this time, the geared motor 18 is connected to the pump 1
7 remains attached. Also, when assembling the uniaxial eccentric screw pump of the present invention, it is possible to assemble the geared motor 18 by attaching the pump 17 to the pump 17 in the reverse order of the above disassembly.

FIG. 2 shows another embodiment of the present invention.
Reference numeral 16 denotes an elongated hollow wheel shaft having a tapered hole formed at an extended tip portion, a base portion of which is supported by a gear case 14 and is rotated by a gear mechanism. I have. That is, the hollow shaft 10 in the above-described embodiment is also used.
No fixing means such as a key stopper 15 is required, and the bolt receiver 12 is attached to the end of the wheel shaft 16. Action and effect are equivalent.

[0019]

According to the present invention, a pump is provided with a geared motor having a hollow wheel shaft which rotates coaxially out of phase with the motor shaft, and a hollow shaft is inserted into the wheel shaft and fixed. The tapered portion of the flexible shaft was inserted into the hole, and the rod attached to the flexible shaft and inserted through the hollow shaft was tightened at the end of the hollow shaft.

[0020] With this configuration, when disassembling and assembling the single-shaft eccentric screw pump, it is only necessary to remove and insert the tightening bolts, and to remove or connect the coupling and the hollow shaft, and to remove the motor. This eliminates the need to perform the work of mounting the pump, and also saves time for the work, facilitates maintenance of the pump, and shortens the maintenance time.

[Brief description of the drawings]

FIG. 1 is a sectional view of a single-shaft eccentric screw pump according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the single-shaft eccentric screw pump according to the present invention.

FIG. 3 is a sectional view of a conventional uniaxial eccentric screw pump.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Stator 2 Rotor 3 Flexure shaft 4 Shaft 5 Bolt 6 Shaft coupling 7 Pump 8 Motor 9 Rod 10 Hollow shaft 11 Bolt 12 Bolt receiver 13 Wheel shaft 14 Gear case 15 Key 16 Hollow shaft 17 Pump 18 Geared motor A Suction port B Discharge port

Claims (3)

[Claims] 1. A single-shaft eccentric screw pump in which a rotor integrally having a flexible shaft is meshed with a stator and rotated, a geared motor having a hollow wheel shaft that rotates coaxially with a phase shifted from the motor shaft is mounted on the pump. Insert the hollow shaft into the shaft, fix it, insert the tapered portion of the flexible shaft into the tapered hole provided at one end of the hollow shaft, tighten the rod that is attached to the flexible shaft and inserted through the hollow shaft A uniaxial eccentric screw pump characterized in that a flexible shaft is connected to a hollow shaft by fastening the other end of the hollow shaft with a bolt. 2. A single-shaft eccentric screw pump according to claim 1, wherein the pump is long and has a tapered hole formed at an extended end thereof, and a wheel shaft serving also as a hollow shaft is used. 3. The uniaxial eccentric screw pump according to claim 1, wherein a bolt receiver at an end of the hollow shaft is mounted so as to be exposed from an end of the wheel shaft.