JPS60252200A - Loosening stopper for impeller nut to be utilized for synthetic resin magnet pump - Google Patents

Abstract

PURPOSE:To improve the anti-loosening effect by forming the loosening stopper with an impeller nut loosening stopper seat metal fixed at the front side of impeller and an impeller nut provided on the pump spindle while pressure contacting against the front face of said seat metal. CONSTITUTION:A loosening stopper seat metal 26 for impeller nut is made of special corrosion-resistant alloy having higher hardness than the synthetic resin impeller nut 25 while provided with rotation stopping section for transmitting the rotary force of spindle 6 and engaged with the spindle 6 to rotate integrally. The seat metal 26 is provided with inclined faces in the tightening direction (a) of nut 25 at the pressure contacting face with the impeller nut 25 and radial projections 26b having engaging faces 26c. In front of the impeller 18, the rotation stopping section of the seat metal 26 is fixed to the rotation stopping section 6a of the spindle 6 and upon tightening of the impeller 25, the projections 26b will bite into the pressure contacting face of nut 25 to increase the binding force and since the impeller nut 25 will never rotate reversely on the stopping face 26c, anti-loosening effect of impeller nut 25 is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to an invera round 1-yuru 7 and stopper device for synthetic resin magnets, pumps, etc.

(Prior art and its problems) Conventional synthetic resin magnet pumps, rubber lining pumps, etc. are mostly used to transport highly corrosive liquids such as acids and alkaline liquids, and there are many restrictions on pump materials and structures. The impeller nut used to secure the impeller to the main shaft of the pump is difficult to apply a loosening prevention device to the in-plane nut 1, which uses a double nut such as a general-purpose metal pump. Therefore, as shown in Figure 1, the impeller that is fixed to the pump main shaft is fixed only by force when tightening the impeller nut using the threaded part at the tip of the pump main shaft. Reverse rotation of the pump due to backflow from piping toward the pump, etc.
Alternatively, the screw of the impeller nut loosens due to vibrations caused by cavitation, etc. that occur in the eye/pull, and the impeller falls off the main shaft of the pump and flies out in front of the axial thrust acting on the pump suction side, causing damage to the casing, etc. Contact may cause fatal damage to the pump.

(Structure of the Invention) This invention employs the following structure for the purpose of eliminating the above drawbacks.

The rotation stop part () is used to attach the impeller (18) to the pump main shaft (6) in the front casing (]) and transmit rotational force.
6a), and a male threaded part (6b) for fixing the impeller (]8) by tightening the impeller nut
) is installed on the front side of the impeller 08), the impeller nut loosening lock washer 2 installed on the front side of the impeller 08) and the pump main shaft (6) should be in pressure contact with the front 1 washer 2 [Hf]. It features an impeller nut (c) and a loosening prevention device.

(Description of Embodiments) The embodiments of the present invention described above will be explained with reference to FIGS. 2 to 11. FIG. FIG. 3 is a longitudinal cross-sectional view showing an example of a stopping device, and FIG. 3 is a cross-sectional view thereof.
5 and 5 show one embodiment of the impeller lock washer, and FIGS. 6 and 7 show other embodiments.

Example 1 As shown in Figures 4 and 5, the impeller nut loosening washer (a) is harder than the impeller nut made of elastic synthetic resin, such as alumina ceramic, silicon carbide, stainless steel, or special It is made of corrosion-resistant alloy, etc., and has a rotation stopper (2) to transmit the rotational force of the pump main shaft (6).
6a), and is adapted to engage with the shaft (6) and rotate integrally therewith. The washer (>p indicates a protrusion (26+) inclined in the tightening direction of the impeller nut (C) (arrow a direction)) is provided radially on the pressure contact surface with the impeller nut (C). This protrusion (26)) gradually climbs up the slope and when combined with the locking surface (26c) that descends in the vertical direction, the rotation stopper (26a) of the washer (4) is placed on the front side of the impeller (c). )
When the is attached to the rotation prevention part (6a) of the main shaft (6) and the impeller nut (C) is tightened, the protrusion (26b) bites into the pressure contact surface of the impeller nut (C), thereby preventing the connection with the impeller nut (A). The power increases and the impeller nut (c)
Since there is no reverse rotation on the locking surface (26c), the impeller nut (c) is prevented from loosening.

Embodiment 2 As shown in FIGS. 6 and 7, the impeller nut loosening prevention washer (a) is harder than the impeller nut (c) made of elastic synthetic resin, such as alumina ceramic, carbonized 11; Made of stainless steel, special corrosion-resistant alloy, etc.
) It has a rotation prevention part (27a) for transmitting the rotational force of the pump main shaft (6). The washer (A) has a plurality of protrusions (27b), for example, 8-1.2 protrusions, each having a slight convexity (27d) in the tightening direction of the impeller nut (in the direction of the arrow) on the pressure contact surface with the impeller nut (C). It is provided on the circumference. , this protrusion (27b) has a chamfer (27()) at one place on the flat surface, and when the perpendicular locking surfaces (27c) at both ends of the protrusion 1μ part (a) are aligned, the impeller (I) is formed. ) on the front side of the washer (A).
), and when the impeller nut (c) is tightened, the protrusion (27b) bites into the pressure contact surface of the impeller nut (a), so the bonding force with the impeller nut (l-E") is high. Now, impeller nut (c) (1st section 1.
, f-[fil (27c) does not rotate in the opposite direction, thus confirming the loosening effect of the impeller nut (c).

Next, FIGS. 8 to 10 show examples of impeller nuts.

As shown in FIG. 8, the impeller nut (
In-vehicle flatness l-E'G of the contact surface between a) and washer (c)
As shown in FIGS. 9 and 10, at least a slight protrusion (25b) having a curve (25c) in the tightening direction (direction of arrow C) is provided. This protrusion (25b) has a flat surface on the other end of the flat surface ([1 straight locking surface (25c) and the locking surfaces (26c) and (27c) of the washer (a), respectively, are aligned to form an impeller nut) Since the impeller nut (c) does not rotate in the opposite direction, the effect of preventing the impeller nut (c) from loosening increases.4. As an example, Fig. 11 shows the case where it is installed on a synthetic resin magnetic pot and knob.

The partition plate (3) provided between the front casing ('') and the rear casing (2) is supported through the front bushing (4) and the rear bushing (5), respectively. Insert the pump shaft (6) into the rear caning (2).
At the end of the day, the motor main shaft C1) was attached to the outside of the first rotation.
The front casing (1) rotates once by the drive magnet (7) and the driven magnet (8), which is attached to the main shaft (6) J2 in the rear casing (2). ) is attached to the front side of the impeller (18) mounted on the main shaft (6) in ) through the impeller nut loosening lock washer (a).
: Tighten the female thread on the impeller nut C→ to the male thread on the tip of the support (6) (Put J to fix the impeller 08) 1
This is an impeller nut loosening device installed in a synthetic resin magnet pump constructed as follows. Although the embodiment shows an example of a synthetic resin magnetic pump, it can also be widely used to fix the impeller of other pumps.

(Effect of lighting) Since the present invention adopts the configuration shown in letter L, the impeller nut loosening prevention device is capable of preventing bolts and bolts due to backflow from the discharge distribution toward the pump when the pump is in reverse phase operation or when the pump is stopped. By rotating the pump in the opposite direction, the impeller nut screws will no longer loosen due to vibrations caused by cavitation in the pump, etc. 1)
It can prevent fatal accidents caused by contact between the pump casing and the impeller, and is a useful means for extending the life of the pump and preventing accidents caused by careless pump operation.

[Brief explanation of drawings]

Fig. 1 is a vertical cross-sectional view showing an impeller and impeller nut attached to a conventional synthetic resin magnet pump, etc. Fig. 2 is a longitudinal cross-sectional view showing an example of a structure in which the impeller nut loosening prevention device of the present invention is installed, Fig. 3 is a cross-sectional view taken along the line /l-A in FIG. FIG. 4 is a front view showing an example of the impeller nut loosening lock washer of the present invention, FIG. 5 is an enlarged sectional view taken along line B-B in FIG. 4, and FIG. 6 is an example of the impeller nut loosening lock washer of the present invention. Front view showing an example, Fig. 7 is C-, -C of Fig. 6
8 is a longitudinal sectional view of the impeller nut, FIG. 9 is a front view of the pressure contact surface of the impeller nut, and FIG.
The drawings are an enlarged sectional view taken along line 1)-D in FIG. 9, and FIG. 11 is a longitudinal sectional view of a synthetic resin magnet pump showing an example of an embodiment in which the impeller nut loosening prevention device of the present invention is installed. (1)...Front casing (6)...Pump main shaft (
6a)...Bo,...-ノ'1-Around the shaft (6b)
...Porbuyo) Shaft male thread (18) Impeller @ Impeller nut Q cape Invera nut I Loosen stop P4 metal Fig. 1 S2 Fig. J Fig. 3 w744 Fig. 5 Fig. 5 a-#□ Figure 6 7 Figure 7 bφ-1111 Figure 9'' et 10

Claims (1)

[Claims] Attach the impeller 08) to the pump main shaft (6) inside the front casing (1) (with the rotation prevention part (for transmitting rotational force)
6a), and a male threaded part (6a) for fixing the impeller 08) by tightening the impeller nut (A) with a screw.
1)) In the case of magnetic pumps made by
An impeller nut loosening prevention device consisting of an impeller nut (A) provided so as to be brought into pressure contact with the front surface of a J-shaped impeller nut loosening washer.