JPS6214452Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a mechanical seal suitable for sealing water in a water pump of an engine, for example.

Technology The conventional mechanical seal was developed in 1986-110865.
As shown in the publication, the sliding surface was small because the contact area was created only by force in the thrust direction, and it was necessary to increase the surface pressure on the sliding surface in order to obtain sufficient sealing function. It was hot. As a result, deterioration such as heat generation, cracking, deterioration, cracking, etc., occurred from the sliding surfaces during operation, which could lead to water leakage. In addition, the conventional type has no flexibility, and even a slight dimensional error or vibration may cause water leakage, resulting in poor followability of the sliding surface.

Problems to be Solved by the Invention The present invention addresses the above-mentioned drawbacks by making the sliding surface multifaceted, including not only the surface in the thrust direction but also the inner and outer surfaces in the radial direction. The objective is to obtain a mechanical seal that relieves pressure, improves adhesion performance, and has high resistance to vibration and combination roughness.

Means for Solving the Problems The mechanical seal of the present invention has a seal portion on the outer circumferential surface and an inner circumferential surface, to which a thrust load is applied, and also has a seal portion on the side surface. a sealing member, a radial biasing member disposed between the annular sealing members and for radially separating the respective annular sealing members; and a radial biasing member movable relative to the annular sealing member; It has a structure consisting of a seal body that integrally has a seal portion that is in sliding contact with each seal portion on the outer circumferential surface, inner circumferential surface, and side surface.

Embodiment To explain the present invention based on an embodiment, it includes a holding frame 2 in contact with a pump body 1, a movable carbon plate 3 serving as an annular seal member with double inner and outer circumferences,
Between 4 and 4 is a drive shaft 6 wrapped in rubber 5.
There are two thrust load springs 7, 8, large and small, which produce a thrust load concentric with . Furthermore, eight radial load springs 9, which are biasing members, are arranged at equal intervals between the carbon plates 3 and 4 so as to separate them from each other in the radial direction. In addition, a wall in contact with the vane 10 having a U-shaped cross section is made of a two-layer structure consisting of a holding frame 11 and a ceramic plate 12 serving as a sealing body. It is movable relative to the inner circumferential seal portion 4a and the side seal portions 3b, 4b to integrally form a sliding contact surface.
Although eight radial load springs 9 are used in this embodiment, the number may be changed to an appropriate number.

Next, the operation of the embodiment of the present invention will be described. The thrust load spring 7 uses the protrusion of the holding frame 2 as a guide plate to press the carbon plate 3 against the ceramic plate 12 from the side, thereby creating a sliding surface. Similarly, the thrust load spring 8 presses the carbon plate 4 against the ceramic plate 12 from the side, creating a sliding surface. Also, the radial load spring 9 presses the carbon plate 3 against the ceramic plate 12 from the inside to create a sliding outer peripheral surface, and simultaneously presses the carbon plate 4 against the ceramic plate 12 from the outside to create a sliding inner peripheral surface. Create a total of three sliding surfaces.

Effects of the Invention As explained above, the present invention has a mechanical seal structure in which the sliding surfaces are formed on the outer peripheral surface, inner peripheral surface, and side surfaces respectively using loading means in the radial direction and the thrust direction. Improves water performance and durability. In addition, even if there is a slight dimensional error in the location where the mechanical seal is used, the accuracy of the combination is improved, so the water sealing performance of the mechanical seal will not deteriorate, making it suitable for use in engine water pumps. When used, it has the effect of maintaining good operation of the pump itself and the engine as a whole.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view of an embodiment of the present invention, and FIG. 2 is a side sectional view of the same half. 1... Pump body, 2... Holding frame, 3, 4
...Carbon plate, 5...Rubber, 6...Drive shaft, 7, 8...Thrust load spring, 9...
...Radial load spring, 10...Vane, 1
1... Holding frame, 12... Ceramic plate.

Claims (1)

[Scope of utility model registration request] Each has a seal portion on the outer circumferential surface and the inner circumferential surface,
A double ring-shaped seal member on the inner and outer peripheries to which a thrust load is applied and also has a seal portion on the side surface, and a radial biasing member that is located between these ring-shaped seal members and separates each ring-shaped seal member in the radial direction. and a mechanical seal body that is movable relative to the annular seal member and integrally has a seal portion that is in sliding contact with each seal portion on the outer circumferential surface, inner circumferential surface, and side surface of the annular seal member. sticker.