JPS58109771A - Non-contact type mechanical seal - Google Patents

Abstract

PURPOSE:To prevent the contact between opposed surfaces of a stationary ring and a rotary ring from occurring even in the condition of a low pressure and prevent the surfaces from being damaged, by a method wherein at least one of opposed surfaces of a stationary ring and a rotary ring is provided with narrow grooves extending from the outer peripheral end to the inner peripheral end. CONSTITUTION:Sliding surfaces 7, 10 of the stationary ring 6 and the rotary ring 9 are provided with the narrow grooves 11, 12 extending from the outer peripheral end to the inner peripheral end, and a sealing fluid is forcibly passed from a high-pressure side A to a low-pressure side B by a pumping action accompanied by a relative rotational displacement of the sliding surfaces 7, 10, whereby the surfaces 7, 10 are lubricated and are prevented from making contact with each other. Accordingly, the effect of the narrow grooves 11, 12 is displayed particularly at the time of low pressures, while at high pressures, the sealing fluid flows from the high-pressure side A to the low-pressure side B between the sliding surfaces 7, 10 to function similarly to a conventional stationary-type non-contact seal, resulting in an effect comparable to that of the conventional seal.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a modified non-welding layer mechanical seal, in which a thin groove is provided in the rotary and stationary parts of the silent overflow non-contact seal to prevent sliding even under low pressure conditions. The purpose is to prevent contact between the moving surfaces and damage accidents at part #7. In general, Cerasec is used as the sliding material of mechanical seals, so it prevents contact during operation. This rounding may damage the sliding material), but conventionally, the sliding material is held in a non-contact state by fluid pressure. In the type of silent pressure non-contact V-ru, a gap is created between the sliding rain, and the rounding is at least 1k'/
- pressure is required, and the operating conditions are restricted because it is necessary to maintain the gap between the sliding surfaces when rotating.90 In view of the above points, the present invention has been developed to prevent sliding even when the pressure is low. The purpose is to provide a non-contact type mechanical seam that does not come in contact with the moving surfaces, and from p1 onwards, an embodiment thereof will be described with reference to the drawings.

(2) A round shaft hole is drilled in the housing (1), and the rotating shaft (3) is inserted into the wire shaft hole (2).
) to the cylindrical part (4) of the armpit stationary ring (6) through the O-ring (5) in an airtight and axially slidable manner. ) and the sliding surface (IQ) of the rotating ring (9), which is airtightly extrapolated to the rotating shaft (3) via the O-ring (8), with a distance of Vc1m from the inside of the upper 1ed-ru portion. In the sliding video (10) of the rotary ring (9) that is high on the outside, there is a radial shape that is inclined in the direction of rotation (arrow C) that extends from the outer peripheral end to the inner peripheral end, as shown in No. 111. Narrow groove (n) (11)・
The sliding surface (7) of the stationary ring (6) has a relative rotational direction (9) extending from the outer peripheral end to the inner end, as shown in FIG. Radial thin #l inclined in the direction of arrow D) (12) (12)・
... is formed, so the structure (after #IC1IX) is determined by the number 1 direction, shape, depth, etc., taking into consideration the properties of the fluid and the rotation direction. The contact type mechanical coolant is equipped with a fine # (11x12) on the inner sliding surfaces (7x10) of the stationary ring (6) and the rotating ring (9) from the outer peripheral end to the inner peripheral end, and a The pump action moves the high pressure side (A) to the low pressure I.
ll (by forcing the sealing fluid to flow to (B)),
It lubricates the sliding surface (7 10) Since the sealing fluid flows between high pressure III (A) and low pressure flu (B), it is manufactured in the same manner as the conventional static pressure non-contact seal and exhibits the same effect.

As explained above, according to the non-contact mechanical seal of the present invention, f is formed on the sliding surfaces of the stationary ring and the rotating ring.
e. Since the seal member is supplied between both lateral moving surfaces from the narrow groove, lubricated rotation is maintained at all times. ) Generates a pumping effect and provides forced VcV even at low pressure.
In addition, the non-contact type mechanical seal of the present invention has a narrow groove shape formed on the sliding surfaces of the stationary ring and the rotating ring. By changing the direction, number, depth, etc., it is possible to construct a cool device fM suitable for the sealing fluid of Fuumei.It is not a fool's errand, and the narrow grooves can be machined relatively easily. , which does not imitate any special manufacturing technology.Furthermore, in the above-described embodiments, the thin grooves were formed on the inner sliding surfaces of the stationary ring and the rotating ring. The same effect can be achieved even if it is configured only on one of the sliding M surfaces of the ring, and the best effect can be achieved by designing the shape of the a-groove formed on each sliding surface independently. The present invention has excellent effects, such as the ability to

[Brief explanation of the drawing]

The drawings show an example of the non-contact mechanical seal of the present invention, in which Fig. 1 is a half-cut sectional view of the seal portion, Fig. 2 is a front view of the rotating ring, and Fig. 3 is a front view of the stationary ring. It is. (1) Housing (2) Shaft hole (2 rotating shafts (4)
) Cylindrical part (5X8) 0 ring (6) Stationary ring (7Xto) M wb *(9
) Rotating ring (u) (12) ia Is
(A) Pressure side (B) Static cost Figure 1' 2 1 σ 31゛ 4 2 / 1: /9 /10 11 , /6 ? ' \=-7

Claims (2)

[Claims] (1) A non-contact mechanical seal in which a stationary ring and an interlocking cylinder are airtightly provided on the housing side and the rotation axis, respectively, and the two sliders are lubricated and slid through a sealing fluid, The sliding motion of the stationary ring and the sliding motion of the rotating ring shown above are the same as the sliding motion of either one of them. The design is characterized by a round ship and a mechanical seal on the non-contact part. (2) The above-mentioned -IpI is inclined in the relative WA@ direction and arranged in a 9-radial pattern, and the bong effect mechanism that causes fPl in positive rotation forces one seal fluid to flow to both sliding surfaces. A non-contact mechanical seal according to claim 1, characterized in that: