JPH0620086Y2 - Shaft runout detection device for pump spindle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a shaft runout detecting device for a pump main shaft.

[Conventional technology]

The conventional device for detecting the shaft runout of the pump main shaft has a shaft runout detection sensor in which a nut is directly fastened to a bearing stand of the main shaft and the like.

[Problems to be solved by the device]

However, according to the conventional device, there is a problem that the vibration of the pump itself is directly transmitted to the shaft shake detection sensor, which adversely affects the detection accuracy. Further, there is a problem that the mounting position of the shaft shake detection sensor with respect to the main shaft cannot be easily adjusted.

The present invention has been made in view of the above problems, and the detection accuracy of the shaft shake detection sensor is less likely to be affected by the vibration of the pump itself, and at the same time, the mounting position of the shaft shake detection sensor can be easily adjusted. The present invention relates to a shaft runout detecting device for a pump main shaft.

[Means for Solving the Problems]

A shaft runout detecting device for a pump main shaft according to the present invention is configured such that a shaft runout detection sensor is inserted into a nut and a sensor mount is fixed to a distal end of the tubular member. While being inserted into the mounting hole formed in the straightening plate, the outer end of the tubular member is fixed to the suction casing and the shaft runout detection sensor is exposed to the main shaft end, and the sensor mount is A tongue piece made of an annular member, in which the collar-shaped positioning portion formed on the outer periphery of the annular member is in contact with the wall surface of the mounting hole, and the tongue pieces provided at a plurality of positions in the circumferential direction of the annular member are It is elastically contacted with the wall surface of the mounting hole.

[Action]

With this configuration, the shaft shake detecting device is housed inside the straightening vane, so that the shaft shake detecting device does not project into the fluid passage of the pump casing and disturb the fluid flow. Also,
The tongue of the annular member that constitutes the sensor mounting tool helps to absorb the vibration of the pump itself, and the shaft runout detection sensor is not attached directly to the bearing base by tightening the nut, so it is retained on the sensor mounting tool. The vibration of the pump itself is difficult to be transmitted to the shaft shake detection sensor. Nevertheless, since the cylindrical positioning portion of the annular member is in contact with the wall surface of the mounting hole of the straightening vane, the mounting state of the shaft shake detection sensor becomes stable. Further, the mounting position of the shaft shake detecting sensor is adjusted by changing the insertion allowance of the shaft shake detecting sensor with respect to the sensor fitting.

〔Example〕

FIG. 1 shows a mixed flow pump equipped with a shaft runout detecting device for a pump main shaft according to an embodiment of the present invention. Reference numeral 1 is a building floor, and a pump casing 3 is attached to the floor 1 via a pump base 2. The pump casing 3 has a suction casing 4 at its lower end. Reference numeral 5 denotes a pump main shaft (hereinafter referred to as a main shaft), which is connected to a motor rotating shaft (not shown) and extends through the bearing housing 6 provided in the pump casing 3 to the inside of the suction casing 4. The end is supported by a bearing 8 with a cap arranged in the center of the suction casing 4. The bearing 8 is supported by the current plate 7 provided in the suction casing 4. A rotary blade 9 is fixed to the main shaft 5. 10 is a shaft sealing mechanism.

In FIG. 4, 13 is a sensor mount, which is a cylindrical member 1.
A sensor attachment 15 made of an annular member is concentrically fixed to the tip of the cylindrical member 4, and a flange 16 is fixed to the outer end of the cylindrical member 14. As is apparent from FIGS. 4 and 5, the annular member forming the sensor mounting member 15 has a flange-shaped positioning on the outer periphery thereof, which has the same or substantially the same diameter as the inner diameter of the mounting hole 12. The portion 17 is provided, and thin tongue pieces 18 are provided at a plurality of circumferential positions spaced apart from the positioning portion 17. Each tongue piece 18 is individually divided by a notch-shaped recess 19, and further projects slightly outward from the positioning portion 17. On the other hand, the tubular member 14 has a cutout 20 at a location near the sensor fitting 15.

As shown in detail in FIG. 3, the casing 22 of the shaft runout detection sensor 21 is provided with a male screw, and nuts 24 and 23 can be screwed into both sides of the casing 22 with the casing 22 inserted in the sensor fixture 15. The shaft shake detection sensor 21 is nut-fastened to the sensor mounting tool 22.

A shaft shake detecting device A according to the present invention is attached to the current plate 7. Fig. 2 is an enlarged cross-sectional view of the mounting location.
As shown in the figure, the straightening plate 7 has an inner tube 1 extending over its entire length.
1 is embedded, and the cylindrical member 14 of the sensor mounting base 13 is inserted into the mounting hole 12 formed by the inner pipe 11. Then, by fixing the flange 16 to the mounting surface 4a of the suction casing 4, the outer end of the tubular member 14 is fixed to the suction casing 4, and the shaft runout detection sensor 21 faces the outer peripheral surface of the end of the main shaft 5. ing. Further, the positioning portion 17 of the sensor attachment 15 has its entire circumferential surface abutting against the wall surface of the attachment hole 12, and the shaft shake detection sensor 21
Is prevented from being displaced in the radial direction, thereby stabilizing the mounting state of the shaft shake detection sensor 21. On the other hand, the plurality of tongue pieces 18 of the sensor attachment 15 are the third
As can be inferred from the figure, it is in elastic contact with the wall surface of the mounting hole 12, and the vibration of the pump itself is absorbed by the elastic deformation of the tongue piece 18, and the vibration is not transmitted to the shaft shake detection sensor 21 as directly as possible. Has become. The tongue piece 18 is pressed into the mounting hole 12 as the tubular member 14 is inserted into the mounting hole 12.

When adjusting the mounting position of the shaft shake detection sensor 21 with respect to the main shaft 5, loosen the nuts 24 and 23 to move the shaft shake detection sensor 21 forward or backward by a predetermined width, and when the proper mounting position is reached, the nut 22, All you have to do is to tighten 23.

The notch 20 provided in the tubular member 14 is used for tightening the nuts 24 and 23 when the shaft shake detection sensor 21 is attached to the sensor mount 15, and for moving the shaft shake detection sensor 21 back and forth to attach the position. Nut 2 when adjusting
Used to loosen and tighten 4,23. Therefore, by providing the notch 20 in the tubular member 14, the attachment position of the shaft shake detection sensor 21 described above can be adjusted more easily.

As is apparent from FIG. 2, the shaft runout detecting device A is opposed to the main shaft 5 at two positions which are separated by 90 degrees. It is designed to detect the shaft runout width. Further, the straightening plate 7 provided with the shaft runout detecting device A has an outer surface corresponding to the mounting hole 12 that swells in a streamlined shape as indicated by a broken line in the figure, thereby minimizing the fluid resistance. It's kept to the limit.

In FIG. 2, reference numeral 25 denotes a cable led from the shaft shake detection sensor 21, which is drawn out through the inside of the tubular member 14. Then, the tube joint 27 is fitted into the insertion portion of the cable flange 26 that is superposed on the outer surface of the flange 16, and the tube joint 27 is inserted.
This prevents water leakage from the mounting hole 12. Reference numeral 30 is a bearing temperature detecting device, which is not directly related to the invention of the present application, and a detailed description thereof will be omitted.

[Effect of device]

As described above, since the axial runout detecting device for the pump main shaft according to the present invention is mounted inside the straightening plate of the pump using the straightening plate of the pump, it is not necessary to provide a special mounting member, and the fluid passage is not required. The shaft shake detecting device does not project into the inside to disturb the fluid flow.

Further, since the vibration of the pump itself is absorbed by the tongue piece of the annular member that constitutes the sensor attachment, the vibration of the pump itself is less likely to be transmitted to the shaft shake detection sensor, and the vibration of the pump itself does not adversely affect the detection accuracy. . Nevertheless, since the cylindrical positioning portion of the annular member is in contact with the wall surface of the mounting hole of the straightening plate, the mounting state of the shaft runout detection sensor becomes stable, and further, the sensor mounting fixture Since the mounting position of the shaft shake detection sensor can be adjusted simply by changing the insertion allowance of the shaft shake detection sensor, it is easy to adjust the mounting position.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a mixed flow pump to which a shaft runout detecting device for a pump main shaft according to an embodiment of the present invention is attached, and FIG. 2 is an enlarged cross-sectional view of a mounting portion of the shaft runout detecting device. FIG. 4 is an enlarged cross-sectional view of the main part of FIG. 2, FIG. 4 is a cross-sectional view of the shaft shake detection sensor mount, and FIG. 5 is an enlarged view of FIG. 4 ... Suction casing, 5 ... Main shaft, 7 ... Rectifier plate, 12 ... Mounting hole, 13 ... Sensor mount, 14 ... Cylindrical member, 15 ...
Sensor fixture, 16 ... Flange, 17 ... Positioning part,
18 ... Tongue piece, 21 ... Shaft shake detection sensor, A ... Shaft shake detection device of pump main shaft.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Yukio Tamaki 1-1-1, Nakamiya Oike, Hirakata-shi, Osaka Prefecture Hokukata Works, Kuboda Iron Works Co., Ltd. (72) Masahiro Taniguchi 1-1-1, Nakamiya Oike, Hirakata-shi, Osaka Prefecture No. 1 Kubota Iron Works Co., Ltd. Hirakata Factory

Claims (1)

[Scope of utility model registration request] 1. A cylindrical member of a sensor mounting base, in which a sensor mounting tool for tightening a nut in a state where a shaft shake detection sensor is inserted is fixed to a tip end portion of the cylindrical member, is formed on a straightening plate of a suction casing. While being inserted into the mounting hole,
The outer end of the cylindrical member is fixed to the suction casing, the shaft runout detection sensor is exposed to the end of the main shaft, the sensor attachment is made of an annular member, and is formed on the outer periphery of the annular member. The collar-shaped positioning portion is in contact with the wall surface of the mounting hole, and tongues provided at a plurality of circumferential positions of the annular member are elastically contacted with the wall surface of the mounting hole. A shaft runout detector for the pump main shaft.