JPH0737829B2 - Compression spring for mechanical seal and method of manufacturing the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compression spring for a mechanical seal used in a shaft sealing device for a submersible pump and a method for manufacturing the compression spring.

[0002]

2. Description of the Related Art In mechanical seals used in shaft sealing devices for submersible pumps, an annular corrugated spring having a plurality of wave numbers is often used as a compression spring. This has the advantage that the mounting length (hereinafter referred to as the span) can be shortened as compared with the coil spring, but since the spring constant of the wave spring itself is relatively large, it is difficult to obtain a large amount of bending.

Therefore, conventionally, a plurality of corrugated springs are superposed on each other so that the peaks of the corrugated springs are in contact with each other, and the contact peaks are welded by spot welding or the like to integrate the corrugated springs. As a result, a device capable of obtaining a large amount of bending has been developed and used.

[0004]

In the conventional mechanical seal compression spring having the above-described structure, when assembling a plurality of corrugated springs, the operator aligns the respective peaks of the corrugated springs with each other, and the concentric cores are formed. It is necessary to carefully adjust the degree of welding before welding the contact crests, which is time-consuming for the alignment work, and easily displaces when welding the crests of the corrugated springs. However, there is a problem in that the yield is deteriorated due to the variation in.

The present invention has been made in order to solve the above-mentioned problems, and can be efficiently assembled without causing the positional displacement of a plurality of wave springs, and has an effective spring characteristic. An object of the present invention is to provide a secure compression spring for a mechanical seal and a manufacturing method thereof.

[0006]

In order to achieve the above-mentioned object, a compression spring for a mechanical seal according to the present invention has a plurality of annular corrugated springs having a plurality of wave numbers superposed on each other in a state where the mountain portions contact each other. A compression spring for a mechanical seal, which is welded and integrated at its contact crests, wherein a positioning recess or protrusion is formed at at least one position in the circumferential direction on the outer peripheral surface of each wavy spring, The concave or convex portions are aligned with each other and the corrugated springs are welded and integrated at the contact peaks.

Further, in the method for manufacturing a compression spring for a mechanical seal according to the present invention, a positioning recess or protrusion is formed on the outer peripheral surface of an annular spring plate member,
The spring plate material is formed into a plurality of corrugations having a wave number based on the concave or convex portion thereof, and then a plurality of corrugated springs are superposed so that the respective mountain portions contact each other, and these corrugated springs are respectively formed. The concave portion or the convex portion is supported by the welding table so that the concave portion or the convex portion fits into the positioning convex portion or the concave portion on the side of the welding table, and in this supporting state, a plurality of wave springs are fused at the contact crest portion to be integrated.

[0008]

According to the present invention, when a plurality of corrugated springs are assembled, if adjacent ones are aligned in their concave portions or convex portions, it becomes easy to obtain concentricity of these corrugated springs, and at the same time, the mountain portion is formed. It is easy to match the contact positions of each other, and these wave springs can be rapidly welded and integrated without any relative displacement, and preferable spring characteristics as a compression spring can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a shaft sealing device for a submersible pump using a compression spring for a mechanical seal according to an embodiment of the present invention.

In FIG. 1, 1 is a main body, 2 is a cover, and 3
Is an O-ring interposed between the main body 1 and the cover 2,
Reference numeral 4 denotes a rotary shaft that penetrates the main body 1 and the cover 2. Reference numeral 5 denotes an annular floating sheet externally fitted to the rotary shaft 4, and an O-ring 6 is interposed between the outer peripheral surface thereof and the inner peripheral surface of the cover 2. Reference numeral 7 is a seal ring having a substantially L-shaped cross section which is fitted onto the rotary shaft 4 via an O-ring 8 while being in contact with one end surface of the floating sheet 5. Reference numeral 9 denotes a stopper ring which is externally mounted on the rotary shaft 4 and fixed by a screw 10, and which prevents the seal ring 7 from axially moving so as to prevent the seal ring 7 from rotating.
Are projected at a plurality of points along the axis. Reference numeral 11 denotes an annular plate that faces the stopper ring 9 and is fitted to the rotary shaft 4. Between the annular plate 11 and the stopper ring 9, the seal ring 7 is interposed between the annular plate 11 and the stopper ring 9. A compression spring 13 which elastically presses the end face and constitutes a mechanical seal 12 together with the seal ring 7 and the stopper ring 9 is interposed.

The compression spring 13 includes a plurality of, for example, two annular wave springs 14 (14A, 14B).
As shown in FIG. 2, each of the wave springs 14A and 14B has a plurality of wave numbers, that is, a plurality of peaks 14a. A positioning recess 15 is formed. Both of these wave springs 14A and 14B are formed in the mountain portion 14
a. The ridges 1 are overlapped with each other so that they contact each other, and the recesses 15 are aligned with each other.
They are integrated by welding spots 4a to each other by spot welding 16.

Next, a method of manufacturing the compression spring 13 will be described.

First, a stainless steel plate having excellent corrosion resistance is prepared as a spring plate material. A tool steel plate or the like may be used if corrosion resistance is not required. An annular spring plate material 31 as shown in FIG. 3 is molded from this stainless steel plate by a press working method or the like. At this time, at the same time,
A recess 15 such as a cutout groove is formed at one location on the outer peripheral surface of the spring plate member 31. Next, the respective annular spring plate members 31 are positioned with reference to the recesses 15 and formed into a corrugated shape as shown in FIG.
(14A, 14B) is created. At this time, the recess 15
Therefore, the waveform is not deviated.

Then, the above-mentioned both wave springs 14A, 1
4B is piled up so that the mountain portions 14a face each other, and FIG.
With respect to the welding table 51 having two surfaces 51a and 51b which are perpendicular to each other as shown in FIG. 2, two points on the outer peripheral surface, which are perpendicular to each other, are set in contact with the two surfaces 51a and 51b.
The welding table 51 is provided with a recess 1 of the wave spring 14.
5 is provided with a positioning convex portion 52, the corrugated springs 14A, 14B are provided on the convex portion 52.
The respective concave portions 52 are fitted and positioned. In this state, if the portions of the contact crest portion 14a are spot-welded and welded to be integrated, the compression spring 1 as shown in FIG.
3 is produced.

As described above, since the concave portions 15 of the wave springs 14A and 14B are fitted to the convex portions 52 on the side of the welding table 51 to perform positioning, the wave springs 14A and 14B are at least overlapped. The automation up to the welding process becomes easy. In particular, if the wave springs 14A and 14B are set on the welding table 51 in an overlapping manner, the wave springs 14A and 14B are aligned with each other, and the contact crests 14a are aligned with each other without any deviation. Springs 14A, 14B
Are integrated with each other in a proper positional relationship.

Since both wave springs 14A and 14B are integrated while maintaining a proper positional relationship, the spring characteristics are not adversely affected, so the compression spring 1
It is possible to exhibit excellent performance by making full use of the characteristics of 3.

The recesses 15 formed on the outer peripheral surface of the wave spring 14 may be provided at a plurality of positions in the circumferential direction.

Further, the concave portion 15 may be replaced by a convex portion. In that case, naturally, the concave portion may be formed on the welding table 51 side.

Further, in the above embodiment, the compression spring 13 is described as being composed of two wave springs 14A and 14B, but it may be composed of three or more wave springs.

[0021]

As described above, according to the present invention, positioning recesses or projections are formed on at least one position in the circumferential direction on the outer peripheral surfaces of a plurality of wave springs that are superposed on each other, and the positioning recesses are formed. Alternatively, since the protrusions are aligned with each other and the two wavy springs are welded and integrated at the contact crests, the wavy springs can be accurately aligned, and the contact crests do not shift in position. The corrugated spring can be assembled, and as a result, the spring characteristics as a compression spring can be maintained satisfactorily, and the mechanical seal can be used so as to reliably exhibit a predetermined function.

According to the method of manufacturing a compression spring of the present invention, a plurality of corrugated springs are superposed after the corrugated molding is performed with reference to the positioning recess or protrusion formed on the annular spring plate material. Since the concave portions or convex portions are supported by the welding table so that they fit into the positioning convex portions or concave portions on the welding table side, the contact crests are welded, so that not only the waveform shaping but also the positioning at the time of welding is ensured. Achieved, facilitating automation of assembly of both wave springs.

[Brief description of drawings]

FIG. 1 is a half cross-sectional view showing a shaft sealing device for a submersible pump using a compression spring for a mechanical seal according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a compression spring.

FIG. 3 is a plan view showing an annular spring plate member before waveform shaping of the compression spring.

FIG. 4 is a perspective view showing a corrugated spring formed by corrugating an annular spring plate material.

FIG. 5 is a diagram showing a state in which two wave springs are overlapped with each other and positioned and set on a welding table.

[Explanation of symbols]

 14A, 14B Wave spring 14a Mountain portion 15 Positioning concave portion (convex portion) 16 Welding portion 31 Annular spring plate material 51 Welding table 52 Positioning convex portion (concave portion)

Claims (2)

[Claims] 1. A compression spring for a mechanical seal, wherein a plurality of annular wave springs having a plurality of wave numbers are superposed in such a manner that their mountain portions contact each other, and are welded and integrated at the contact mountain portions. Then, a positioning recess or projection is formed at at least one position in the circumferential direction on the outer peripheral surface of each wavy spring, and the positioning recesses or projections are aligned with each other so that the wavy spring is contacted by the contact crests. A compression spring for mechanical seals, characterized by being welded and integrated. 2. A positioning recess or protrusion is formed on the outer peripheral surface of an annular spring plate member, and the spring plate member is formed into a plurality of wave shapes having wave numbers based on the recess or protrusion, and then, A plurality of wave springs are piled up so that the mountain portions contact each other, and these wave springs are attached to the welding table so that the concave portions or the convex portions fit into the positioning convex portions or concave portions on the welding table side. A method of manufacturing a compression spring for a mechanical seal, which comprises supporting and corrugating the wave spring at the contact crest portion so as to be integrated.