JPS6128139Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a spring for a mechanical seal.

Conventionally, in a mechanical seal that seals fluid by a fixed seal ring 2 that is in surface contact with a seat ring 1 that is fitted onto a rotating shaft and rotates together as shown in Fig. 4, the seat ring 1 and the seal ring 2 are generally Pressure is applied to the contact surface, and this pressure is applied by compressing one or more coil springs 5 incorporated within the rubber sealing material 3. Therefore, in order to give as uniform a load as possible to the driven seal ring 2, the upper and lower end surfaces of the coil spring 5 are polished flat as shown in FIG. 5, and the upper surface of the coil spring 5 is A spring seat 4 is fitted to ensure an even load. However, since the coil spring 5, which is usually formed by bending a single wire, has a tendency to concentrate its repulsion at one point, it is difficult to obtain an equal repulsion force on both end faces, and it is difficult to obtain a strong and smooth repulsion force. If you want to achieve this, the only solution is to increase the overall length even if the wire diameter is thicker, or to use multiple wires, which increases costs, requires a large installation space, and makes assembly work troublesome. There were some shortcomings. Furthermore, polishing both end faces of the coil spring 5 to make them horizontal requires a very troublesome process, which increases the cost.

The present invention eliminates these drawbacks and provides a flat spring for mechanical seals that does not take up much space and provides uniform pressure.

To explain the present invention based on the drawings, as shown in Fig. 1, three or more slits 6 each having circular arcs with different diameters connected in a hook shape are inserted into a ring-shaped spring metal plate having a desired strength. , the slits 6 do not intersect or touch each other, and the outer slit 6a and the inner slit 6b are substantially concentric circular arcs, each end of which is a slit 6 facing toward the center.
A ring-shaped spring metal plate is provided at a distance so as not to intersect or touch part c, and is separated into an outer circumferential part and an inner circumferential part by the slit 6. The outer circumferential part and the inner circumferential part of the ring-shaped spring metal plate are arranged vertically as shown in Fig. 2. Flat spring A for mechanical seals that is staggered and kept horizontal to each other
get.

The flat spring A has a strong flat ring-shaped surface on the upper and lower surfaces similar to the spring part 7, and between these two rings there are three or more spring parts 7 having a spring effect as shown in FIG. Moreover, since the plurality of spring parts 7 support each ring surface (the number of spring parts 7 is determined by the number of slits 6), an average spring effect is exerted on both the upper and lower ring surfaces, and a uniform exert force. In order to apply a pressing force to the fixed seal ring 2 which is in surface contact with the seat ring 1 which is fitted onto the rotating shaft and rotates together with the flat spring A as shown in FIG. When installed inside, the seal ring 2 is pressed against the seat ring 1 with a uniform force. Furthermore, the strength of the compressive repulsive force of the flat spring A can be adjusted as desired by changing the spring constant of the material of the flat spring, the height dimensions of the upper and lower surfaces of the ring, the number of slits, etc. In addition to being able to obtain a flat spring A with a repulsion force of 1,000 yen, manufacturing costs can be greatly reduced because punching with a power press, slitting, and plastic working up to a predetermined size on the top and bottom can be done in one step.

As described above, according to the present invention, uniform pressure is applied to the seat ring, and the cost is low and simple, and the space for the fitting part of the mechanical seal can be reduced, resulting in a compact and low-cost mechanical seal. It has excellent effects such as being able to obtain

[Brief explanation of drawings]

FIG. 1 is a plan view of the flat spring of the present invention. FIG. 2 is a front view of the flat spring of the present invention. FIG. 3 is a sectional view of the mechanical seal with the flat spring of the present invention installed. FIG. 4 is a sectional view of a mechanical seal equipped with a conventional spring. FIG. 5 is a front view of a conventional spring. A...Flat spring, 6...Slit,
6a...Slit on the outer circumference side, 6b...Slit on the inner circumference side, 6c...Slit facing toward the center, 7...
Spring part.

Claims (1)

[Scope of utility model registration request] A mechanical seal consists of a mechanical seal in which either one rotates with the rotating shaft and has smooth sliding surfaces perpendicular to the rotating shaft, and the contact pressure between the two sliding surfaces prevents leakage of the sealed fluid. The spring has three or more slits in which circular arcs with different diameters are connected in a hook shape in a ring-shaped spring metal plate, and the outer circumference side slit and the inner circumference side slit are almost concentric circular arcs without intersecting each other. A flat spring for mechanical seals whose tips are arranged so that they do not intersect with the slit in the center direction, and whose outer and inner circumferential parts are shifted vertically and kept horizontal.