JPH08121385A - Draining flange - Google Patents

Abstract

PURPOSE: To provide a draining flange which is easily and stably mounted on a rotary shaft in vicinity of a bearing box. CONSTITUTION: A cylinder part is protruded to one side through the periphery of the shaft insertion hole of a plate-form flange body 1 having a shaft insertion hole 3 and a cylinder part 7 and notch parts 5 are formed in a cylinder part and a plurality of tongue pieces 6 having tip parts inclined toward the center of the shaft insertion hole are formed. This constitution mounts the tongue pieces on a shaft in a resilient deformed state and stably attaches a plate-form flange body without deformation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainage collar attached to a rotary shaft in a rotary machine having a bearing such as a pump in order to prevent foreign matter from entering the bearing.

[0002]

2. Description of the Related Art When a rotary shaft is rotatably supported on a machine body, the rotary shaft is supported by a bearing housed in a bearing box provided on the machine body. In this case, a sufficient gap is required between the rotary shaft and the bearing box so that the rotary shaft and the bearing box do not come into contact with each other. However, there is a risk that foreign matter may enter the bearing through this gap, and in order to prevent this, various water drainage collars have conventionally been provided on the rotary shaft as close as possible to the bearing housing.

As the water draining collar, a circular rubber plate having an appropriate thickness and having a shaft insertion hole in accordance with the shaft diameter is widely used. However, this rubber plate is troublesome to mount on the rotating shaft due to frictional force, and if the shaft insertion hole is too small, the rubber plate body deforms and contacts the bearing box, so it is too close to the bearing box. Can not be provided. Further, there is a problem that the anticorrosion property is not sufficient depending on the material of the invading substance and the atmosphere.

Therefore, as shown in FIGS. 3 and 4, the shaft insertion hole 1 is formed in a corrosion-resistant, for example, circular stainless plate 10.
1 and a slit 13 are provided, or a tubular portion 12 is provided around the shaft insertion hole 11 and a slit 13 is provided from the tubular portion 12 to a part of the main body. However, when it is mounted on the shaft, it is a structure that distorts the draining brim body 10 itself, which is a stainless steel plate, by applying an unreasonable force, which is not stable in mounting and requires a large force for mounting work. There is a problem that workability is poor, such as requiring a large jig. Therefore, the present invention is easy to mount on the shaft,
Moreover, it aims at providing the drainage brim with good stability.

[0005]

In order to achieve the above-mentioned object, the present invention provides, in claim 1, a draining collar having a cylindrical portion on one side from the periphery of the shaft insertion hole of a plate-shaped collar body having a shaft insertion hole. A plurality of tongue pieces were formed by projecting in the same direction and forming a notch in this cylindrical portion so that the tip portion is inclined to a smaller diameter than the shaft insertion hole. Further, in the second aspect, the short tubular portion is provided between the plurality of tongue pieces by the notch.

[0006]

EXAMPLE An example of the present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 1 denotes a drainage collar according to the present invention, for example, a stainless steel plate is punched into a circular shape to form a plate-shaped collar body 2, and a rotary shaft S to be mounted at the center thereof.
At the same time as providing the shaft insertion hole 3 for loose fitting, a cylindrical portion 4 is formed on one side of the flange main body 2, and a notch 5 is provided in the cylindrical portion 4, so that a plurality of tongue pieces 6 are formed on the cylindrical portion 4. And short tube portions 7 are alternately provided, and the tip portion of the tongue piece 6 is slightly inclined inward.

Therefore, in order to mount the water draining collar 1 on the rotary shaft S of the pump, as shown in FIG. 2, the tongue piece 6 is positioned on the opposite side of the bearing box 8 and the shaft insertion hole 3 is rotated. It may be fitted to the shaft S and moved to a predetermined position. That is, when mounting the drainage collar 1 on the rotating shaft S, the inner diameters of the base portion and the short tubular portion 7 of the tongue piece 6 are slightly larger than the diameter of the rotating shaft S, and the tip end side of the tongue piece 6 is attached to the rotating shaft S. Since it is elastically deformed and attached, it can be attached very easily.

The number of the tongues 6 can be appropriately changed depending on the diameter of the rotary shaft S, and the mounting direction of the tongues 6 on the rotary shaft S is such that the tongues 6 face the bearing box 8 side. May be. Also, the short tube portion 7 is not always necessary,
Although it may be removed, the presence of the short tubular portion 7 further improves the sealing property with the rotating shaft S. Reference numeral 9 is a bearing.

In the above-described embodiment, the case where the water drainage collar is mounted on the rotary shaft of the pump has been described. The present invention can be applied to an apron mounted on the outer cylindrical portion of the stuffing box of the casing cover so as to prevent the leakage and guide the leaked liquid to the drip pan.

[0010]

As is apparent from the above description, claim 1
According to the invention described in (1), the cylindrical portion is projected to one side from the periphery of the shaft insertion hole of the plate-shaped collar body having the shaft insertion hole, and the notch is provided in the cylindrical portion so that the tip portion is more than the shaft insertion hole. The tongue is formed by forming multiple tongues that are inclined to a small diameter, and is attached to the shaft by elastically deforming the tongue.The plate-shaped collar body does not deform, and the length of the tongue is the length of the collar body. Since it is longer than the thickness and has a large pressure contact area, it can be easily and stably attached to the shaft. Further, since the collar body is not deformed, the clearance with the shaft does not change, and the intrusion of foreign matter from this clearance is extremely small. Furthermore, since no force acts on the collar body, a thin plate can be used, and therefore, the collar body can be easily manufactured at low cost by press working or the like.

According to the second aspect of the invention, the short tubular portion is interposed between the tongue pieces, and this portion covers the shaft by the length of the short tubular portion in addition to the thickness of the collar body. Therefore, it is possible to almost certainly prevent foreign matter from entering through the gap in this portion.

[Brief description of drawings]

FIG. 1 is a perspective view of a draining collar according to the present invention.

FIG. 2 is a cross-sectional view when the water drainage collar of FIG. 1 is attached to a rotary shaft.

FIG. 3 is a perspective view of a conventional drainage collar.

FIG. 4 is a perspective view of a conventional drainage collar.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Water-cutting collar 2, ... Collar main body, 3 ... Shaft insertion hole, 4 ... Notch, 5 ... Notch, 6 ... Tongue piece, 7 ... Short tube part, 8 ... Bearing box, S ... Rotating shaft.

Claims (2)

[Claims] 1. A plate-like collar body having a shaft insertion hole, wherein a cylindrical portion is projected to one side from the periphery of the shaft insertion hole, and a notch is provided in the cylindrical portion so that the tip portion is inclined to a diameter smaller than that of the shaft insertion hole. A drainage brim characterized by forming a plurality of tongues. 2. The water drain collar according to claim 1, wherein a short tube portion is provided between the plurality of tongue pieces by the notch.