JP3166335U - Swirling / removal mechanism of centrifugal pump impeller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an impeller attachment / detachment mechanism capable of tightening / loosening a presser foot of an impeller and restraining a pump shaft on the shaft end side. SOLUTION: A key groove is provided on an impeller presser foot 16 to share a key 12 of an impeller shaft, a hexagonal or notched tool hook is provided on the outer periphery of the presser foot, and a screw hole or an extension screw shaft is provided at a shaft end. To give. [Selection diagram] Fig. 1

Description

  The present invention is based on the “Japanese Patent Application No. 2009-241185: Centrifugal Pump Integrated with Electric Motor” (hereinafter referred to as “Invention 1”) and “Japanese Patent Application No. 2009-165327: Centrifugal Pump and Pump Unit” (hereinafter referred to as “Invention”). 2), the impeller drive side is related to the impeller attaching / detaching mechanism of the pump having a closed structure on the drive side.

  In the conventional centrifugal pump, the shaft joint connected to the electric motor is exposed, the shaft end side of the pump casing is opened, and when installing and removing the impeller, a tool is put on the shaft joint to restrain the pump shaft, The impeller presser foot bolt or presser nut can be tightened and loosened on the shaft end side to install and remove the impeller.

  In a motor-integrated centrifugal pump with a pump set length shortened by connecting the motor and the pump body to a flange, the drive shaft system of the impeller is all closed, so that the pump shaft is similar to the bolt or presser nut of the presser foot. For restraint, it is necessary to bring a tool from the shaft end side of the pump casing opening and to work safely and reliably.

  In order to solve the above problems, an impeller attaching / detaching mechanism capable of working on the shaft end side is provided for tightening and loosening the presser foot of the impeller and restraining the pump shaft.

Means to solve the problem

  The key of the impeller boss is pressed by the presser plate part that touches the end face of the impeller and has an outer hexagon or notch that is applied with a tool, and a short cylindrical part that is fitted in the impeller boss and has a key groove. The impeller attaching / detaching mechanism is configured in which the pump shaft is constrained by a working tool from the shaft end side, a screw hole is provided in the pump shaft end, and the presser foot can be tightened or loosened with a bolt.

  The above-mentioned bolt has a plurality of (2 to 3) hexagon socket head bolts at the end of the large-diameter pump shaft, and the stirring of the impeller suction liquid is limited by the sinking head from the surface of the presser foot. The exposed head of the bolt may be used, all of which prevent loosening of a spring washer or the like.

  This can be applied to large pumps to reduce the pump shaft length, which is advantageous for saving the motor removal space for inspection of insulation and opening of the bearings.

  For medium and small pumps with a small shaft end, an extended screw shaft with a small diameter from the bottom of the keyway is provided instead of the screw hole, and the presser foot can be tightened or loosened with a nut.

  The pump shaft constraining tool (box spanner or protruding tool) applied to the outer periphery of the presser foot is temporarily fixed with the casing cover mounting bolt, and the presser bolt or nut tool (hexagon wrench or box spanner) is coaxial. It is convenient for the stable operation of the tool to insert and tighten and loosen the presser foot.

  Since the impeller boss is attached to the pump shaft end with a light interference fit (H7 / j6) or dead-fit (H7 / h6), screw holes on the boss end face (both suction type) or side plate (single suction type) of the impeller And attach the impeller pulling tool from the shaft end side, and push the blade boss end face by light hitting or warm fitting to perform removal and attachment of the impeller.

Effect of device

  Since the presser foot is mounted without play by the short cylindrical part fitted to the impeller boss and the common key, it is not affected by operating vibration and fluid vibration, and it is difficult to cause loosening of the tightening bolt and nut. Therefore, use a spring washer to prevent loosening.)

  The shaft end of the large-capacity pump only needs to be close to the end of the impeller boss, and the pump shaft length can be reduced to save the motor removal space. The small-capacity pump has little effect on the shaft length of the extension screw shaft.

  Since the pump shaft end can be all turned and key grooved, in addition to the bore and tapping of the large diameter shaft end, the machining process of a standard standard motor can be adopted. Other than chipping, turning and punching are sufficient.

  Side sectional view of the centrifugal pump with the impeller attachment / detachment mechanism according to the first embodiment of the present invention.   Structural view of presser foot of impeller attaching / detaching mechanism of embodiment 1 of the present invention   Side sectional view of a centrifugal pump provided with an impeller attaching / detaching mechanism according to Embodiment 2 of the present invention.   Structure figure of presser foot of impeller attaching / detaching mechanism of embodiment 2 of the present invention   Structure figure of another plan of the presser foot of the impeller attaching / detaching mechanism of the second embodiment of the present invention {the main part also applies to the first embodiment}

  In a pump having a closed impeller drive portion, such as the motor-integrated centrifugal pumps of the above-described invention 1 and invention 2, the shaft restraint and the bolt or nut of the impeller presser foot are fixed on the shaft end side of the pump casing opening. The impeller can be manually attached and detached by tightening and loosening, and an embodiment thereof will be described below with reference to the drawings.

  In FIG. 1, if the periphery of the impeller and the pump shaft end according to the present invention is shown, an electric motor 2 is coupled to the pump casing 1 by flanges 1f and 2f, and the electric motor shaft 3 is extended jointlessly so that the pump shaft 3 ), Supported by the bearing 4, having a drainer 5, a boss 7 disposed on the suction flow path shell 6, a shaft seal mechanical seal 8, a boss 11 of the impeller 10, a key 12, and a pump 12. It is connected to the shaft end 9.

  The flange-coupled casing cover 13 is removed from the pump casing 1 so that the shaft end side is opened, and an opening 14 in the casing inner casing slightly larger than the outer diameter of the impeller 10 appears.

  As shown in the enlarged view of the main part of the present invention in FIG. 2, a screw hole 15 is machined in the shaft end 9, and the impeller boss 11 is tightened by the presser foot 16 and the bolt 17, and the spring isher 18 is used to prevent loosening. The presser foot 16 has a hexagonal outer periphery or a presser plate portion 16p with a circular notch as shown in FIG. 5 and a short cylindrical portion 16c fitted into the impeller boss 11 and provided with a key groove 16k as shown in the AA arrow view. And the key 12 of the impeller boss 11 is shared.

  Therefore, in the mounted state of the impeller 10, the presser foot 16 is fitted and coupled to the shaft end 9 together with the impeller boss 11 with the key 12, and the bolt 17 is screwed into the screw hole 15 of the shaft end 9 to be tightened. Integrates without inertia due to starting torque and pump operating vibration. When attaching / detaching the impeller 10, the pump shaft 3 is restrained by the tool 19 applied to the outer periphery hexagon or notch of the presser foot 16, and the tool 20 is used to tighten the bolt. The impeller 10 can be attached and detached by tightening and loosening 17.

  In the case of a plurality of bolts 17, the presser plate portion 16 p of the presser foot 16 uses a hexagon socket bolt to thicken the presser plate portion 16 p to be a sinking head (not shown), and the stirring resistance of the suction fluid of the impeller 10 Can be avoided.

  The handle (not shown) of the hollow tool 19 is temporarily fixed by using the mounting bolt 21 of the casing cover 13 and is tightened and loosened with the tool 20 (the handle portion is not shown) coaxially inserted into the tool 19. Is safe and secure.

  A screw hole 22 is provided on the end face of the impeller boss 11, the presser foot 16 is removed, and a pulling tool (not shown) is attached, so that the impeller 10 can be removed from the shaft end 9.

  3, the periphery of the impeller 10 and the pump shaft end 9 according to the present invention, and the enlarged view of the main part of the present invention in FIG. 4, the extension screw shaft 23 and the nut 24 of the shaft end 9 are connected to the screw holes 15 of the first embodiment. In addition, it is the same as the first embodiment except that the impeller boss 11 is tightened and loosened by the presser foot 16 instead of the bolt 17.

  Since the screw diameter of the extension screw shaft 23 can be taken to the key groove bottom of the shaft end 9, it can be made larger than the shaft end screw hole 15 of the first embodiment, and is preferably applied to a medium / small capacity pump.

  In the medium / small capacity pump, the impeller 10 is of a single suction type, and its suction inner diameter is made small and the end face diameter of the boss 11 is restricted. Therefore, as shown in FIG. 19 is applied (can also be applied to the first embodiment in which the diameter of the shaft end 9 is large), and a screw hole for extraction is preferably formed in the thick part of the side plate 25 of the impeller 10 while avoiding the blade end. (This screw hole balances the hydraulic pressures on both sides of the side plate 25 of the impeller 10 and contributes to reducing the thrust of the shaft 3).

Industrial applicability

  The features of the existing centrifugal pumps of the first invention and the second invention in which the space of the conventional centrifugal pump is reduced, the number of parts is reduced, the structure is simple, the shaft end side is opened, and the maintenance front is opened. It will be completed with a de-mechanism, and it will be used as an auxiliary machine for large / medium caliber seawater / fresh water / lubricating oil systems in ship engines.

DESCRIPTION OF SYMBOLS 1 Pump main body, pump casing 1f Coupling flange 2 Electric motor 2f Coupling flange 3 Motor shaft, pump shaft 4 Bearing 5 Water drainage 6 Channel inner shell 7 Shaft seal boss 8 Shaft seal, mechanical seal 9 Shaft end 10 Impeller 11 Impeller Boss 12 Key 13 Casing cover 14 Casing inner shell opening 15 Shaft end screw hole 16 Presser foot 16p Presser plate portion 16c Short cylindrical portion 16k Key groove bottom portion 17 Presser bolt, bolt 18 Spring washer 19 Shaft restraint tool, tool 20 Tightening / loosening Tool, tool 21 Bolt for casing cover, bolt 22 Screw hole for boss extraction, screw hole 23 Extension screw shaft 24 Presser nut, nut 25 Impeller side plate, side plate

Claims (2)

Use the impeller shaft key as the presser foot on the shaft end side of the impeller boss, and apply a hexagonal or notched tool hook on the outer periphery of the presser foot to constrain the pump shaft and provide screw holes at the shaft end of the impeller. A centrifugal pump impeller attachment / detachment mechanism that can be tightened and loosened with bolts so that the work can be performed on the shaft end side as well as pulling out the impeller. The impeller shaft key on the shaft end side of the impeller boss shares the impeller shaft key, and a hexagonal or notched tool hook is applied to the outer periphery of the presser foot to constrain the pump shaft, and the extension screw shaft at the shaft end of the impeller A centrifugal pump impeller attachment / detachment mechanism that is configured so that the work clamp can be tightened and loosened with a nut and the impeller can be pulled out and all operations can be performed on the shaft end side.

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