JPS6342206Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sealing device. More specifically, the present invention relates to a sealing device such as a water pump.

The prior art related to this invention is
There are mechanical seals used in pumps and the like as shown in Figures 1 and 4 of Publication No. 3150. However, this type of mechanical seal has a complicated structure, which makes maintenance difficult, and the overall length in the axial direction is long, resulting in an increase in the number of installation locations, which may make it structurally impossible to install. There is.

Furthermore, there is a device shown in FIG. 1 that solves this problem of not being able to be attached.

This type of shaft seal device uses fluid pressure applied to a fixed wall plate 51 to bring the sliding end 53 of an elastic annular seal member 50 fitted around the outer periphery of a rotating shaft 52 into contact with one side wall surface of the fixed wall. This is an end-face sliding type that seals between the fixed wall plate 51 and the rotating shaft 52.

In this shaft sealing device, since the elastic annular sealing member 50 is made of an elastic material such as rubber,
Although it has excellent self-sealing properties, it has a large friction coefficient, so when high fluid pressure is applied, the contact pressure on the sliding surface with the fixed wall plate increases, and the frictional resistance becomes abnormally high, causing seizure of the elastic annular seal member. It also had the disadvantage of causing abnormal wear. On the other hand, when the fluid pressure is low,
The centrifugal force generated when the seal member 50 rotates weakens the close contact between the sliding end 53 and the fixed wall plate 51, resulting in a problem in sealing performance.

The present invention was developed in view of the above-mentioned problems, and the technical problem is to provide a sealing device that has sealing ability regardless of the pressure of the sealed fluid and has durability. There is a particular thing.

The technical means of the present invention for solving this technical problem is configured as follows. In other words, the free end side slides in a truncated conical shape with respect to the radial surface of the fixed part fixed to the mounting part of one of the two members that rotate relative to each other and the other member that slides relative to each other. It has a lip portion whose surfaces are in close contact with each other, and
A sliding ring plate comprising a sealing member made of a rubber-like elastic material in which a fixed part and a lip are integrally joined by both ends of a bent support part, and the sliding surface of the lip part has a small coefficient of friction. and has a plate spring that has a shape substantially similar to the cross-sectional shape of the seal member and is integrally joined or overlapped so that the sliding surface of the lip can be pressed against the radial surface. It is.

Hereinafter, one embodiment of the present invention will be described in detail based on the drawings. FIG. 2 is a sectional view of a sealing device showing an embodiment of the present invention, and FIG. 3 is a partial side view of FIG. 2. A sealing device disposed between one member 1 that rotates with a radial surface 3 and the other member 2 that has a mounting portion 4 that rotates relative to the one member 1 has an annular fixed portion 5 and a radial surface. It has a lip part 6 formed in the shape of a truncated cone with respect to the surface 3, and the fixing part 5 and the lip part 6 are integrally connected by a supporting part 7 bent in the radial direction. A seal member 8 made of an elastic material is provided. The sliding surface 9 of the lip portion 6 of this sealing member 8 is formed by a sliding ring plate 10 made of a resin material being integrally adhered to the lip portion 6. Furthermore, an annular plate spring 11 made of a metal material is bonded to the outer peripheral side of the sealing member 8 from the free end side of the lip portion 6 to the fixed portion 5 .
In addition to the resin material, the sliding ring plate 10 may be made of a material with a small coefficient of friction such as oil-impregnated sintered material. Furthermore, the sliding ring plate 10 has a sealing portion 12 in the form of a screw-shaped convex or concave portion on the sliding surface 9.
is provided. Further, the leaf spring 11 is made of a resin material or the like in addition to a metal material. This is because, in order to generate the required surface pressure of the sliding ring plate 10, each material is selected according to its characteristics. Further, the leaf spring 11 has a large number of slits 13 radially extending in the radial direction on the side of the lip portion 6, and is designed to be easily elastically deformed.
Instead of providing the leaf spring 11, the leaf spring 11 may be divided along the circumferential direction of the seal member 8. Furthermore, the integration of the leaf spring 11 with the seal member 8 is similar to that of the seal member 8.
It may be possible to connect only the root side to the fixed part 5 of the sealing member 8 without adhering it to the lip part 6 of the sealing member 8, or it may be buried and integrated.

In the sealing device configured as described above, the fixed portion 5 is fitted into the mounting portion 4 of the other member 2, and the sliding surface 9 of the lip portion 6 is brought into close contact with the radial surface 3 of the one member 1. Therefore, the following effects are achieved. Since the sealing device is provided with a support part 7 bent to have elastic force, the radial surface 3 is moved so that the sliding surface 9 is provided with the required surface pressure by the support member 7. can be elastically pressed. As a result, it is possible to form a surface pressure such that the surface pressure effect of the lip portion 6 is not influenced (decreased) by each pressure of the fluid to be sealed. This effect is further improved by providing the leaf spring 11. In other words, since the leaf spring 11 has a bent portion like the support portion 7, only this elasticity allows the lip portion 6 to be reliably pressed against the radial surface 3, and the lip portion 6 is covered. On the contrary, the pressure against the radial surface 3 due to the sealing fluid pressure is prevented by the reaction force of the leaf spring. Furthermore, it is possible to prevent the lip portion 6 from being expanded in the radial direction due to the action of centrifugal force due to the rotation of the one member 1, thereby weakening the contact force. This can be further improved by providing . Since the sliding surface 9 is formed of the sliding ring plate 10 with a small coefficient of wear, it is possible to effectively prevent the sliding surface from being worn even if it is strongly pressed by the elastic force of the support section 7. In particular, it is expected that the sealing effect will be further improved by providing the sliding surface 9 with screw-shaped recesses or protrusions 12. Furthermore, providing the sliding ring plate 10 forming the sliding surface 9 can greatly improve the durability of the sliding surface of the sealing device.

In addition, since the support part 7 and the leaf spring 11 having elastic force can form the necessary pressing force on the lip part 6, the sealing device can be made compact and can be made larger like a mechanical seal. It can effectively remove the complexity of the process.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional shaft sealing device, FIG. 2 is a sectional view of a sealing device of the present invention, and FIG. 3 is a partial side view of FIG. 2. 1... One member, 2... Other member, 3... Radial direction surface,
4... Attachment part, 5... Fixed part, 6... Lip part, 7... Support part, 8... Seal member, 9... Sliding surface, 10... Sliding ring plate, 11... Leaf spring, 12... Seal part, 13
...Slit, 50...Sealing member, 51...Fixed wall plate, 52...Rotating shaft, 53...Sliding end.

Claims (1)

[Scope of utility model registration request] A fixed part 5 fixed to the mounting part 4 of one of the two members that rotate relative to each other and a radial surface 3 of the other member.
On the other hand, a support part 7 has a lip part 6 formed in a truncated conical shape and in which the sliding surface 9 on the free end side is in close contact with each other, and the fixed part 5 and the lip part 6 are bent.
The sliding surface 9 of the lip portion 6 is formed by a sliding ring plate 10 having a small coefficient of friction, and the seal member 8 is integrally connected by both ends of the lip portion 6 and is made of a rubber-like elastic material. A sealing device provided with a leaf spring 11 having a shape substantially similar to the cross-sectional shape of the member 8 and integrally joined or stacked so as to be able to press the sliding surface 9 against the radial surface 3.