JPH0633796B2 - Shaft fixing device for ceramic impeller for submersible pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention The present invention relates to a shaft fixing device for a ceramic impeller for a submersible pump.

Since the pump used in water sucks in sand and sand, the metal impeller is heavily worn, and if worn, it needs to be replaced with a new one in order not to deteriorate the pump performance. There is a problem in that repair costs are high.

Recently, ceramics such as silicon carbide have been attracting attention as a material that is lightweight, has high hardness, and is excellent in abrasion resistance, but has the drawback that it is extremely difficult to process and is weak against impact. Precise finishing is required because the shaft hole of the boss portion must be statically fitted to the pump shaft and the key groove must be engraved in the boss portion. Further, when the impeller is removed, a method of applying a spanner or the like to the back surface of the back plate and hitting it with a hammer is often used, so that it is necessary to have a strength capable of withstanding the impact. Therefore, it has been considered practically difficult to make the impeller made of ceramic.

In the present invention, a ceramic having a high hardness is used for a portion requiring abrasion resistance, and a metal or an inflexible synthetic resin having excellent workability is used for a portion requiring precision finishing. An object of the present invention is to provide a shaft fixing device that configures an impeller having excellent durability that can exhibit the characteristics of different materials and that can be easily attached to and removed from the pump shaft of the impeller.

(2) Structure of the invention In the shaft fixing device for a ceramic impeller for a submersible pump according to the present invention, the shaft fixing device is made of metal or inflexible synthetic resin in which a shaft hole is bored in the central part and a locking flange is projected at one end. The boss material is formed as a set of two, and a boss material fitting hole is formed at the center of the back plate of the ceramic impeller, and the boss material is fitted into the boss material fitting hole from both sides of the back plate. When the outer peripheral portion of the fitting hole is clamped by the locking collar, a slight gap is formed between the facing surfaces of both boss members. By bringing the locking collar into contact with the step portion of the pump shaft and tightening the tightening nut screwed on the tip of the pump shaft in the axial direction, the outer periphery of the boss fitting hole is sandwiched between the locking collars. It is configured to be fixed in a shape.

Referring to the drawings of the embodiment, 1a and 1b are a pair of boss members made of metal or inflexible synthetic resin, each of which has a shaft hole 2 at the center thereof and a locking collar 3 at one end. Is projected. K is a key groove formed in the shaft hole 2. Reference numeral 4 denotes an impeller made of ceramic such as silicon carbide. A boss material fitting hole 5 for fitting the boss materials 1a and 1b is formed at the center of the back plate. Reference numeral 6 is a pump shaft, and 7 is a tightening nut screwed onto the tip of the pump shaft 6.

When the boss members 1a and 1b are fitted into the boss member fitting holes 5 from both sides of the back plate and the outer peripheral portions 8a and 8b of the fitting holes 5 are clamped by the locking flanges 3 and 3, both boss members are A slight gap g is formed between the facing surfaces of 1a and 1b.
The pump shaft 6 is inserted into the pump shaft 6 and the locking flange 3 of the one boss 1a is brought into contact with the step portion 9 of the pump shaft 6, and the tightening nut 7 screwed on the tip of the pump shaft 6 is axially moved. If you tighten,
The outer peripheral portion of the boss material fitting hole 5 is fixed between the locking flanges 3 and 3 in a clinging manner.

Further, if the tightening nut 7 is removed and the boss member 1b is separated, it is extremely easy to use the impeller 4 without using any tools.
Can be extracted.

(3) Effect of the Invention According to the device of the present invention, when the boss members 1a and 1b are fitted into the boss member fitting holes 5, a slight gap g is formed between the facing surfaces of the boss members 1a and 1b. Therefore, by screwing the tightening nut 7, the outer peripheral surfaces 8a, 8b of the boss material fitting hole 5 are firmly fixed in a clasping manner between the locking collars 1a, 1b, and the tightening nut 7 By removing the boss member 1b, the impeller 4 can be easily extracted by removing, and there is no need to detach the impeller while tapping it with a wooden hammer as in the conventional case. Therefore, it is possible to provide the shaft fixing device which is easily mounted and extracted by using the impeller 4 made of ceramic and having excellent wear resistance. And the boss material 1
Since only a and 1b are made of metal or plastic with good workability, the shaft hole 2 that slides with the pump shaft 6
Can be precisely drilled, and the keyway K can be easily engraved.

[Brief description of drawings]

FIG. 1 is a side view of a longitudinal section of an essential part showing a shaft fixing device of the present invention. FIG. 2 is a side view of an essential part of the axial fixing device showing a state in which the boss material is unclipped. FIG. 4 is a plan view of the impeller of the invention shaft fixing device as seen from the front side, FIG. 4 is a half cross-sectional view showing a state in which two pairs of boss members of the invention shaft fixing device are opposed, and FIG. It is a top view which shows the state which developed the opposing surface of the boss material of one set in a fixing device. 1a, 1b ...... 2 sets of 1 boss, 2 ... Shaft hole, 3 ...
Locking collar, 4 ... Ceramic impeller, 5 ... Boss fitting hole, 6 ... Pump shaft, 7 ... Tightening nut, 8a, 8b ...
... Outer peripheral part of boss material fitting hole, 9 ... step, g ... gap.

Claims (1)

[Claims] 1. Two bosses (1a) (1b) made of metal or inflexible synthetic resin having a shaft hole (2) at the center and a locking collar (3) protruding at one end. A boss member fitting hole (5) is formed at the center of the back plate of the ceramic impeller (4), and the boss members (1a) and (1b) are fitted from both sides of the back plate. When the outer peripheral portions (8a) and (8b) of the fitting hole (5) are fitted into the hole (5) and held by the locking brims (3) and (3), both boss members (1a) and (1b). A slight gap (g) is formed between the facing surfaces of the pump shaft (6) in the shaft hole (2) and the locking collar (3) of the one boss (1a) is pumped. By contacting the stepped portion (9) of the shaft (6) and axially tightening a tightening nut (7) screwed to the tip of the pump shaft (6), a boss material fitting hole (5) Outer periphery (8a) (8b) Engagement flange (3) (3) shaft fixing apparatus ceramic impeller submersible pump brought configured to be secured to the clamping manner between.