JP4737926B2 - Vertical electric pump - Google Patents

Description

  The present invention relates to a saddle type electric pump in which the pump height can be easily lowered by improving the bearing structure.

  In the conventional vertical electric pump, the rotor inserted in the stator supports the non-load side lead-out portion of the motor shaft by the bearing in the upper bearing case, and the load-side lead-out portion of the motor shaft extended downward is the lower portion. A structure is adopted in which the bearing is supported by a bearing in the bearing case (see, for example, Patent Documents 1-4).

  In this way, in the structure in which the bearing case and the bearing are arranged in each of the load side lead-out part and the anti-load side lead-out part of the motor shaft, the length of the motor shaft becomes long and as a result, the pump height increases and the center of gravity increases It is easy to tip over in an unstable installation location, and when using it in a place where there is a restriction on the height such as under the floor and cannot be installed vertically, it is unavoidable to lay down the vertical pump and install it forcibly. Cannot be lowered to the bottom of the water, and therefore cannot be drained to the bottom water level.

  For the purpose of lowering the pump height, a cantilever support structure has been proposed in which the bearing on the non-load side lead-out portion of the motor shaft is omitted and only the load-side lead-out portion is supported by a double row bearing (for example, a patent Reference 5).

However, in the cantilever support structure with only the load side lead-out part, even if it is a double row bearing, not only does the shaft run out and the bearing is easily worn, but the rotor is greatly eccentric due to slight shaft runout of the motor shaft, There is also a possibility of causing a serious result that the eccentric rotation of the rotor causes contact with the stator.
JP 11-75345 A (Fig. 1-2) JP 2003-166493 A (FIG. 1) JP 2003-166494 A (FIG. 1) Japanese Patent Laid-Open No. 10-266995 (FIG. 3-4) JP-A-6-249184 (FIG. 1)

  The problem to be solved is that the vertical electric pump can be configured without causing shaft runout and with a low pump height.

The present invention has a bearing structure that does not cause shaft runout and has a low pump height. Therefore, the bearing on the non-load side lead-out portion of the motor shaft is omitted, the bearing on the load side is kept, and the rotor and stator An anti-load-side rolling bearing is attached to each annular groove recessed near the upper end of the insertion surface, and the rotor is pivotally supported in the stator by the rolling bearing and the load-side bearing. The main feature is that it is configured as described above.

  According to the vertical type electric pump of the present invention, since a part having a larger diameter than the load side lead-out part of the motor shaft is supported by the rolling bearing, a bearing having a much larger size than the conventional bearing is used and allowed. There is no risk of shaft runout due to an increased load, and the life of the bearing itself is significantly prolonged. Further, by omitting the bearing on the non-load-side lead-out portion of the motor shaft, there is no bearing case part for housing the bearing, and the length of the motor shaft can be shortened, so that the pump height is reduced. Therefore, the center of gravity is low and it is difficult to fall even in unstable setting places. Also, when used in places where the height is restricted, such as under the floor, the pump can be installed in an upright position without lying down. Therefore, there is an advantage that the water can be drained to the bottom water level while the pump suction port is lowered to the bottom. Furthermore, since the rotor, the motor shaft, and the bearings on the load side and the anti-load side can be lifted upward in the combined state, there is a secondary effect that assembly and disassembly are easy. It will be.

  1 and 2 of the embodiment, 1 is a pump casing, 2 is an oil casing provided on the pump casing 1, and 3 is erected above the pump casing 1 via the oil casing 2. A motor frame, 3A is a bearing on the load side mounted on the housing 3B on the lower surface of the motor frame, 4 is a stator housed in the motor frame 3, 5 is a rotor inserted in the stator 4, and 6 is the center of the rotor 5. The pump shaft 1 is guided to the pump casing 1 by a bearing 3A, and a guided tip 6a is mounted on an impeller 7 in the pump casing 1.

  An annular groove 8 is recessed in the outer periphery near the upper end of the rotor 5, and the depth thereof is adapted to the inner diameter of the inner ring 9 a of the rolling bearing 9 on the opposite load side described later. An annular groove 8b is recessed in the inner periphery near the upper end of the stator 4 and is recessed extremely shallowly to match the outer diameter of the outer ring 9b of the rolling bearing 9 on the opposite load side. Reference numeral 9 denotes a rolling bearing, and the inner ring 9 a on the opposite side to the load is fitted into the annular groove 8 provided in the outer periphery near the upper end of the rotor 5, and is provided in the inner periphery near the upper end of the stator 4. Further, the outer ring 9b of the anti-load-side rolling bearing is mounted in the annular groove 8b, and the rotor 5 is disposed in the stator 4 by interposing the trochanter 9c between the opposed surfaces of the inner ring 9a and the outer ring 9b. It is constituted so that it can be pivoted in a freely rotating manner. With this configuration, the rotor 5, the motor shaft 6, the load-side bearing 3 </ b> A, and the anti-load-side bearing 9 can be lifted upward in the combined state. Note that the recess of the annular groove 8b in the inner periphery of the stator 4 is not an essential requirement, and the point is that the outer ring 9b may be structured to be stably mounted on the inner periphery near the upper end portion of the stator 4.

It is a principal part vertical side view of the vertical electric pump of this invention. It is a principal part enlarged view of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Pump casing 2 Oil casing 3 Motor frame 3A Load side bearing 3B Housing 4 Stator 5 Rotor 6 Motor shaft 6a Leading tip 7 Impeller 8 Ring groove
8b Ring groove 9 Rolling bearing on the opposite load side 9a Inner ring 9b Outer ring 9c Trochanter

Claims (1)

The stator is housed in a motor frame that is erected above the pump casing via an oil casing. The motor shaft is led out from the center of the rotor inserted into the stator, and the outer peripheral surface thereof is formed on the housing on the lower surface of the motor frame. A vertical electric pump that is supported by a mounted load-side bearing and whose leading end is mounted on an impeller in the pump casing, and is formed in an annular groove that is recessed in the outer periphery near the upper end of the rotor. The inner ring of the anti-load-side rolling bearing is fitted, the outer ring of the anti-load-side rolling bearing is mounted in the annular groove recessed in the inner periphery near the upper end of the stator, and the inner ring and the outer ring are opposed to each other. A saddle type electric pump characterized in that a rotor is pivotally supported in a stator by a mode in which a trochanter is interposed between faces.

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