JP2005061317A - Vertical shaft pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vertical shaft pump capable of effectively suppressing propagation of vibration generated by a pump impeller and a bowl part to an upper part with a relatively simple structure without increasing pump weight. <P>SOLUTION: A flexible pipe 3 is put between the bowl part 1 and a column pipe or in a middle of the column pipe in the vertical shaft pump of a structure in which the bowl part 1 storing the pump impeller 2 and the column pipes 4-1, 2, 3, 4 are connected and main shafts 7-1, 2, 3 connected to a rotary shaft 5 of the pump impeller 2 are arranged in the column pipes 4-1, 2, 3, 4. Consequently, propagation of generated vibration can be effectively suppressed by a relatively simple structure without making the pump of a strong structure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vertical shaft pump having a structure in which a bowl portion accommodating a pump impeller and a pumping pipe are connected in a vertical direction.

  Conventionally, this type of vertical shaft pump has a configuration in which a bowl portion that accommodates a pump impeller and a pumping pipe are connected in series in a vertical direction, and a main shaft that is connected to a rotating shaft of the pump impeller is disposed in the pumping pipe. In the vertical pump configured as described above, the pump generates vibration in the following cases (A) to (C). In order to suppress this vibration, measures have been taken to prevent vibration such as making the pump structure sturdy or providing a support member on the pumping pipe and fixing the support member to the inner wall of the suction water tank. However, if the pump structure is made rugged, there is a problem that the pump weight increases, and the anti-vibration measures for providing a support member on the pumping pipe also require construction such as fixing the support member to the inner wall surface of the water tank. There is a problem that it is difficult to install in an existing aquarium.

  (A) When the pump is operated in a state where the water level of the suction tank is low, when the shape of the suction tank is inappropriate, or when the amount of water is increased by updating the pump in the existing suction tank (by increasing the flow velocity in the tank) If the pump sucks the air suction vortex or submerged vortex that occurs. (B) When cavitation occurs in the pump impeller. (C) In the preceding standby pump, from the air-water mixing operation to the air lock (the preceding standby pump enters air from the air pipe when the suction water level becomes low, enters the air-water mixing operation, and a larger amount of air is sucked, Pumping is impossible and airlock operation is performed).

  The present invention has been made in view of the above points, and eliminates the above problems and transmits vibrations generated in the pump impeller and the bowl to the upper part with a relatively simple configuration without increasing the pump weight. It is an object of the present invention to provide a vertical shaft pump that can effectively suppress the above.

  In order to solve the above-mentioned problem, the invention according to claim 1 has a configuration in which a bowl portion accommodating a pump impeller and a pumping pipe are connected, and a main shaft connected to a rotating shaft of the pump impeller is arranged in the pumping pipe. The vertical shaft pump is characterized in that a flexible pipe is interposed between the bowl portion and the pumping pipe or in the middle of the pumping pipe.

  According to a second aspect of the present invention, there is provided a vertical shaft pump according to the first aspect, wherein a plurality of chains or stays are connected between a bowl portion located at both ends of the flexible tube and an end portion of the pumping pipe or an end portion of the pumping tube. It is connected with bolts.

  According to a third aspect of the present invention, in the vertical shaft pump according to the first or second aspect, a flexible shaft coupling is interposed between the rotary shaft of the pump impeller and the main shaft or in the middle of the main shaft.

  According to the first aspect of the present invention, since the flexible pipe is interposed between the bowl portion and the pumping pipe or in the middle of the pumping pipe, the vibration of the pump impeller and the bowl portion is absorbed by the flexible pipe. Therefore, it is possible to provide a vertical shaft pump that can effectively suppress the propagation of vibrations generated with a relatively simple configuration without making the pump structure sturdy. Moreover, it can be attached to an existing suction water tank in the same manner as a conventional vertical shaft pump.

  According to the invention described in claim 2, the bowl portion located at both ends of the flexible tube and the end portion of the pumping tube or the ends of the pumping tube are connected by a plurality of chains or stay bolts. Since the tube and the load below it can be supported, and the device load below it is not applied to the flexible tube, the vibration absorption action of the flexible tube is not impaired and the transmission of vibration is effectively suppressed. be able to.

  According to the third aspect of the present invention, the flexible shaft joint is also bent in conjunction with the bending of the flexible tube by interposing the flexible shaft joint between the rotation shaft and the main shaft of the pump impeller or in the middle of the main shaft. Therefore, the rotational force of the main shaft can be smoothly transmitted to the pump impeller.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a configuration of a vertical shaft pump according to the present invention. A flexible pipe 3 is connected to the upper end of the bowl portion 1 in which the pump impeller 2 is accommodated, and a plurality of pumping pipes 4-1, 4-2, 4-3 are connected to the upper side of the flexible pipe 3. -1 and 16-2 are connected vertically and in series. A curved pumping pipe 4-4 is connected to the upper end of the pumping pipe 4-3.

  A rotary shaft 5 of the pump impeller 2 is rotatably supported in the bowl portion 1 by a thrust bearing 6, and a main shaft 7-1 is connected to the main shaft 7-1 through a flexible shaft joint 16. Main shafts 7-2 and 7-3 are sequentially connected through 8-1, 8-2, and a rotary shaft 10 of a motor (not shown) is connected to the upper end of the main shaft 7-3 through a shaft coupling 9. The main shafts 7-1, 7-2, and 7-3 are pumped-up pipes 4-1 and 4-4 through radial bearings 11-1, 11-2, and 11-3 attached in the connecting pipes 16-1 and 16-2. 2, 4-3 and 4-4 are rotatably supported. The reason why the thrust bearing 6 is also provided in the bowl portion 1 so as to receive the load of the pump impeller 2 and the hydraulic thrust load is that the bending shaft coupling 16 cannot transmit the thrust force.

  A flange 12 and a flange 13 are provided at the upper end of the bowl portion 1 located at both ends of the flexible tube 3 and the lower portion of the pumping pipe 4-1, respectively. The flange 12 and the flange 13 are formed by a plurality of chains 14. It is connected. Thereby, the lower equipment load is supported by the chain 14 from the pumping pipe 4-1. It should be noted that the equipment loads of the vertical shaft main shafts 7-1 to 7-3, the bowl portion 1 and the pump impeller 2 and the like are sucked into a suction water tank (not shown) via a gantry 17 fixed to the pumping pipes 4-1 to 4-4. )) Is supported by a pump bed 18 provided above.

  In the vertical shaft pump having the above-described configuration, the rotary shaft 10 of the prime mover for starting the prime mover (not shown) rotates, and the rotational force of the rotary shaft 5 of the pump impeller 2 via the main shafts 7-3 to 7-1 and the flexible shaft joint 16. And the pump impeller 2 is rotated. The water sucked from the lower end of the bell mouth 15 by the rotation of the pump impeller 2 is pumped through the bowl portion 1 and the pumping pipes 4-1 to 4-4. At this time, in the cases (A) to (B), vibrations are generated in the pump impeller 2 and the bowl part 1, and the vibrations are flexibly interposed between the upper end of the bowl part 1 and the pumping pipe 4-1. It is accommodated in the tube 3 and is not transmitted to the upper part.

  2A and 2B are diagrams showing a configuration example of the flexible tube 3, in which FIG. 2A is called a rubber bellows type, and FIG. 2B is a rubber straight type. The rubber bellows type has a configuration in which the base portions 22 are attached to both ends of the flexible rubber portion 21 of the bellows-shaped cylinder as shown in FIG. The upper ends of the bowl portion 1 and the lower end of the main shaft 7-1 shown in FIG. Also, the rubber straight type has a configuration in which the cap parts 24, 24 are inserted and fixed at both ends of the flexible rubber part 23 of the straight cylinder as shown in FIG. 2 (b). The upper ends of the bowl portion 1 and the lower end of the main shaft 7-1 shown in FIG. 2A and 2B are one configuration example of the flexible tube 3, and the flexible tube 3 is naturally not limited to this.

  FIG. 3 is a diagram illustrating a configuration example of the flexible shaft coupling 16. The elastic rubber 25 formed in a polygonal shape is attached to the flange 26 provided at the end of the rotating shaft 5 of the pump impeller 2 and the flange 27 provided at the end of the main shaft 7-1 with bolts 28. It is a configuration. FIG. 3 shows an example of the configuration of the flexible shaft coupling 16, and the flexible shaft coupling 16 is naturally not limited to this.

  Further, in the above example, the flange 12 and the flange 13 are connected by a plurality of chains 14, and the lower equipment load from the pumping pipe 4-1 is supported by the plurality of chains 14, but instead, Although not shown, the flange 12 and the flange 13 may be connected using a plurality of stay bolts.

  Moreover, in the said example, although the flexible tube 3 is interposed between the bowl part 1 and the pumping-up pipe 4-1, it is not limited to this, For example, the middle of the pumping-up pipe 4-1, or the pumping-up pipe 4- Naturally, it may be provided in the middle of the pumping pipe such as No. 1 and the pumping pipe 4-2 (however, the one closer to the bowl portion 1 is more effective in suppressing vibration propagation). In the above example, the flexible shaft coupling 16 is interposed between the rotary shaft 5 and the main shaft 7-1 of the pump impeller 2, but the main shaft 7-1 is in the middle or between the main shafts 7-1 and 7-2. It may be provided in the middle (however, it may be provided at substantially the same position as the flexible tube 3).

  Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made within the scope of the technical idea described in the claims and the specification and drawings. Is possible.

It is a figure which shows the structural example of the vertical shaft pump which concerns on this invention. It is a figure which shows the structural example of a flexible tube. It is a figure which shows the structural example of a bending shaft coupling.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bowl part 2 Pump impeller 3 Flexible pipe 4-1 Pumping pipe 4-2 Pumping pipe 4-3 Pumping pipe 4-4 Pumping pipe 5 Rotating shaft 6 Thrust bearing 7-1 Main shaft 7-2 Main shaft 7-3 Main shaft 8 -1 shaft coupling 8-2 shaft coupling 9 shaft coupling 10 rotating shaft 11-1 radial bearing 11-2 radial bearing 11-3 radial bearing 12 flange 13 flange 14 chain 15 bell mouth 16 flexible shaft coupling 17 mount 18 pump floor

Claims (3)

In a vertical pump having a configuration in which a bowl portion accommodating a pump impeller and a pumping pipe are connected, and a main shaft connected to a rotating shaft of the pump impeller is disposed in the pumping pipe,
A vertical shaft pump characterized in that a flexible pipe is interposed between the bowl portion and the pumping pipe or in the middle of the pumping pipe. The vertical shaft pump according to claim 1, wherein
A vertical shaft pump characterized in that the bowl portion located at both ends of the flexible pipe and the end of the pumping pipe or the ends of the pumping pipe are connected by a plurality of chains or stay bolts. In the vertical shaft pump according to claim 1 or 2,
A vertical shaft pump characterized in that a flexible shaft coupling is interposed between a rotation shaft and a main shaft of the pump impeller or in the middle of the main shaft.

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