JPH0635877B2 - Multi-stage pull-out vertical shaft pump - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a pull-out type vertical shaft pump provided with impellers in upper and lower stages.

(Prior Art) As is well known, in a pull-out vertical shaft pump, in order to prevent an increase in crane capacity due to an increase in size of the pump, only a rotary system including a pump main shaft and an impeller is used as a fixed system such as a pumping pipe and an outer casing. It can be taken out with the installed, and the maintenance weight can be easily checked, such as reducing the lifting weight.The vertical shaft pump with multiple stages of impellers has a pull-out type. Nakatsuta. That is, the multi-stage equipment of the impeller is used in combination such that, for example, a lower-stage impeller having good suction performance is used and an upper-stage impeller having excellent pumping performance is used. Despite the fact that the impeller's multi-stage equipment causes a significant increase in pump weight, it has never been possible to consider a pull-out type with a reduced crane capacity.

(Problems to be Solved by the Invention) In the case where the multistage vertical shaft pump is of pull-out type, the simplest conceivable structure is to employ a double barrel structure as shown in FIG. In this case, the discharge bowls B and C are separated from the pumping pipe A and are arranged inside the pumping pipe A. The impellers D and E are placed in the discharge bowls B and C, respectively.
Is intended to be stored. According to this, pumping pipe A
By using a straight pipe type, the rotating system can be lifted.
However, since the lifting is performed with the discharge bowls B and C that are not rotating systems, the lifting weight is increased accordingly, and the crane capacity must be set large, and at the same time the pumping pipe diameter is unreasonably large. The overall weight increases. Therefore, in order to realize the pull-out type of the multi-stage vertical shaft pump without impairing the effect of the original pull-out function, only the rotary system is discharged while leaving the bowl on the pumping pipe side like the single-stage pull-out vertical pump 8. Must be able to be lifted.

In view of this point, the present invention has an object to provide a multi-stage pull-out type vertical shaft pump capable of hoisting only the rotary system of the pump, and particularly a guide vane type vertical shaft pump having a configuration for pulling out.

(Means for Solving the Problem) In the present invention, a discharge bowl that bulges outward in a vertically multi-stage manner is continuously provided between a bell mouth and a pump pipe, and the discharge bowl has a diameter smaller than the pump pipe inner diameter. Along with the boss, the inner diameter of the connecting portion between the upper and lower discharge bowls should be the same as or larger than the inner diameter of the boss, while the pump spindle should have an impeller that fits in each discharge bowl and each blade. A bearing support base for gripping the pump main shaft via a bearing is attached to a portion directly above the vehicle, and the bearing support base has a shape suitable for insertion into and removal from a boss portion, and a lower stage provided on the lower stage side bearing support base. The fixed projecting plate serving as the side guide vane and the fixed projecting plate serving as the upper stage side vane provided on the upper bearing support base are connected by the suction cover body located inside the connecting portion, and the suction cover body and the fixed projecting body are connected. By the board A guide passage is formed to concentrate pump water pumped by the lower-stage impeller toward the center of the upper-stage impeller, and the fixed protruding plate as the lower-side guide vane and the fixed protruding plate as the upper-side guide vane are used as the upper-side bearing support base. It is characterized in that it is provided at a portion inside the outer diameter of.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, between the pumping pipe 1 and the bell mouth 2, two upper and lower discharge bowls 3 and 4 are connected in series. These discharge bowls 3 and 4 have a shape that bulges slightly outward with respect to the pumping pipe 1, and boss portions 5 and 6 are supported and fixed to the pump pumping guide plates 7 and 8 inside thereof. The pump pumping guide plates 7 and 8 are provided outside the bosses 5 and 6, respectively.
Form 0. The inner diameters of the bosses 5 and 6 are slightly smaller than the inner diameter of the pumping pipe 1. Further, the upper and lower discharge bowls 3 and 4 are connected by a straight pipe connecting pipe 11, and the inner diameter of the connecting pipe 11 is at least equal to or slightly larger than the inner diameter of the upper boss portion 5.

The pump main shaft 12 has the discharge bowls 3, 4 at the lower end thereof.
Corresponding to the above, the impellers 13 and 14 are fixed to the upper and lower two stages so as to rotate integrally, and the bearing supports 15 and 16 are attached to the portions directly above the impellers 13 and 14, respectively. These bearing support 1
5 and 16 support the pump main shaft 12 via bearings 17 and 18, and the upper stage bearing support 15 is properly fitted into the boss portion 5 of the upper discharge side so that it can be inserted into and removed from the boss 5 of the bowl 3, and the lower stage bearing support is shown. 16 is properly fitted into the boss portion 6 of the lower-stage discharge bowl 4 so that it can be inserted into and removed from the boss portion 6. Therefore, the pump main shaft 12 and the impellers 13 and 14 are attached to the boss portions 5 and 6 by bearing support bases 15 and 16, respectively.
It is stably supported through.

Reference numeral 19 is a protective tube for the pump main shaft 12, and the upper bearing support 15 is connected to the protective tube 19.

The upper bearing support 15 and the lower bearing support 16 are located inside the connecting pipe 11, and the suction cover body 20 is provided.
Connected by. Simultaneously with this connecting action, the suction cover body 20 guides the pump pumped water sucked from the bell mouth 2 by the lower stage side impeller 14 and pumped to the pump pumping flow passage 10 to the central part of the upper stage side impeller 13. The lower end is connected to the fixed protruding plate 21 of the lower bearing support 16 and the upper end is connected to the fixed protruding plate 22 of the upper bearing support 15. The fixed protruding plate 21 forms a guide passage for communicating the pump pumping flow passage 10 with the inside of the suction cover body 20, and the fixed protruding plate 22 has a guide passage for communicating the inside of the suction cover body 20 with the pump pumping passage 7. Is what creates. Therefore, these fixed projecting plates 21 and 22 serve as guide vanes at the upper and lower stages of the multi-stage guide vane vertical shaft pump. Further, these fixed projecting plates 21 and 22 are provided so as to project at a portion inside the outer diameter of the bearing support 15.

In this way, when the pump main shaft 12 is suspended by a crane (not shown) for maintenance and inspection, the upper stage bearing support 15 is pulled out upward from the upper stage boss portion 5, and the upper stage impeller 13
Also comes out of the upper boss portion 5 from the lower side to the upper side, and the suction cover body 20 has the connecting pipe 1 having the same diameter as the inner diameter of the boss portion 5.
Since it is inside 1, the upper boss portion 5 is also inserted.
Further, the lower bearing support 16 and the lower impeller 14
Goes through the lower boss portion 6 upward, and then inserts the upper boss portion 5. Therefore, as is apparent from FIG. 2, the pump main shaft 12, the upper and lower impellers 13, 14, the upper and lower bearing supports 15, 16 and the suction cover body 20 are lifted,
The fixed system of the pumping pipe 1, the bell mouth 2, the upper and lower discharge bowls 3 and 4, the connecting pipe 11, and the upper and lower boss portions 5 and 6 is left.

In FIG. 1, the outer diameter of the lower bearing member 16 is made slightly smaller than that of the upper bearing member 15 in the drawing to facilitate the upward lifting, but the same diameter may be adopted even if the same is used. Good, in that case, the inner diameters of the upper and lower boss portions 5 and 6 are the same.

(Effects) As described in detail above, according to the present invention, the pump is a single-body type in which the pump discharges to the pump pipe and the bowl is integrally connected, and a boss portion having a diameter smaller than the pump pipe inner diameter is provided in the discharge bowl. In addition, the inner diameter of the connecting portion between the upper and lower discharge bowls should be the same as or larger than the inner diameter of the boss portion, while the bearing support base on the pump spindle side should be properly fitted to the boss portion, and the upper and lower bearings Connect the support base with the suction cover body located inside the continuous portion, and fix the fixed protruding plate as a guide vane that connects the upper and lower bearing support bases to the suction cover body more than the outer diameter of the upper bearing support base. Since the pump main shaft, the impeller, the bearing support and the suction cover body can be integrally lifted by being provided at the inner portion, even in the guide vane type pull-out vertical shaft pump in which the impeller is provided in multiple stages, Fig. 3 The weight of the suspended part can be significantly reduced compared to the double-cylinder structure, and the crane capacity can be reduced. Moreover, since the pumping pipe diameter is not unnecessarily expanded, the weight of the pump can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical sectional front view showing an embodiment of a multistage pullout type vertical shaft pump according to the present invention, and FIG. 2 is a vertical sectional front view showing a state in which a rotary system is lifted in FIG. FIG. 3 is a schematic diagram showing the simplest possible structure for pulling out a multistage vertical shaft pump. 1 ... Pumping pipe, 2 ... Bell mouth, 3, 4 ... Discharging bowl, 5, 6 ... Boss part, 11 ... Connection pipe (continuous connection part),
12 ... Pump spindle, 13, 14 ... Impeller, 15, 1
6 ... Bearing support, 20 ... Suction cover body

Claims (1)

[Claims] 1. Discharging bowls (3, 4), which bulge outward in a vertically multi-stage manner, are continuously provided between a bell mouth (2) and a pumping pipe (1), and these discharging bowls (3, 4) are provided. A boss part (5, 6) smaller than the inner diameter of the pumping pipe (1) is provided inside, and the inner diameter of the continuous part (11) between the upper and lower discharge bowls (3, 4) is set to the above boss part (5, 6). ) The inner diameter is the same as or larger than the inner diameter, while the pump spindle (12) has an impeller (13, 14) that fits into each discharge bowl (3, 4) and each impeller (1
Located directly above (3,14) and bearing (1) for the pump main shaft (12).
Attach the bearing support base (15, 16) that grips via the (7, 18), and the bearing support base (15, 16) has a shape that fits properly into the boss part (5, 6) so that it can be inserted and removed, and the lower side The fixed protruding plate (21) provided as a lower guide vane provided on the bearing support base (16) and the fixed protruding plate (22) provided as an upper guide vane provided on the upper bearing support base (15) are connected in series. Connected by the suction cover body (20) located inside the portion (11), the suction cover body (20) and the fixed projecting plates (21, 22) are used to pump the pump water by the lower stage impeller (14) to the upper stage blades. A fixed projecting plate that forms a guide passage that concentrates toward the center of the vehicle (15) and serves as the lower guide vane.
(21) and fixed protruding plate (22) as upper guide vane
A multi-stage pull-out vertical shaft pump in which the upper stage bearing support (15) is provided inside the outer diameter.