Liquid seal, shaft seal apparatus and pump apparatus using the same
A technology of fluid sealing and sealing parts, which is applied in the field of shaft sealing devices and pump devices, which can solve the problems of reduced safety pressure, increased service life of seals, increased wear of seals, etc., and achieves the effect of reducing liquid leakage and reducing leakage.
Inactive Publication Date: 2012-05-16
ADVICS CO LTD
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Problems solved by technology
However, installation in reverse posture will cause oil to squeeze out from the sliding contact side to the atmosphere side, causing the oil in the intermediate chamber to leak to the outside
[0016] As described above, since the second sealing part of the pump device of Patent Document 2 is used with the lipped fluid seal in the above-mentioned reverse posture, it has a decompression function on the one hand, but on the other hand, the sealing performance is lowered, so the intermediate chamber Increased amount of oil leakage to the outside
[0017] In addition, in general, if the lip length L3 of a fluid seal with a lip is increased, the lip is easy to bend, and the safety pressure decreases when used in a reverse posture, and the liquid will leak from the sealing surface even if the liquid chamber side does not reach an abnormally high pressure.
Although the amount of leakage is small, if the seal is used for a long time, the amount of leakage will exceed the allowable value
[0018] In addition, if the reduction of the safety pressure is suppressed by shortening the lip length, thickening the wall thickness of the lip, or increasing the hardness of the material rubber, the lubricity or the followability to the vibration of the rotating shaft will deteriorate, thereby increasing the sealing performance. Wear and leakage of liquid from seals
Method used
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[0081] Prototype Figure 4 The fluid seal 1. The following to the fluid seal 1 Figure 8 The dimensions of the parts shown are described.
[0082] Dimensions of Fluid Seal 1
[0083] Outer diameter D1: φ14mm; overall length L1: 5mm; fixed part length L2: 4.5mm; lip length L3: 1.6mm; distance L4 from the fixed part end to the front end of the lip: 4.5mm; lip outer diameter D2: φ10mm; Lip inner diameter D3: φ6mm; inclination angle α of the inclined surface on the front end side of the lip of the sealing lip: 25°; inclination angle β of the inclined surface 4b on the base end side of the lip: 30°; offset L of the spring 7: 0.2mm .
[0084] Use the fluid seal (prototype 1) of the above specifications and the fluid seal (prototype 2) with the same specifications as the prototype 1 except for the spring offset L: 0.3mm, and set it in Figure 5 The diameter of the pump unit: φ7mm. The pump drive is closed with the outer periphery of the rotating shaft. Of course, the fluid seal...
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A liquid seal (1) has an annular lip portion (2) and an annular fixing portion (3) to be fixed to an inner peripheral surface of a shaft hole(12), in which the lip portion (2) is connected to the fixing portion (3) and is provided so that a tip thereof is extended in an axial direction, a spring (7)pressing a seal lip (4)against an outer periphery of the rotation shaft (13)is fitted onto the lip portion (2). The seal lip (4) forms a mountain shape in which an edge (4c)of the apex in the cross section, which is cut along a plane passing through a center axis of the seal, protrudes to the inner diameter side, and the pressure center of the seal lip (4) due to the spring is disposed between the tip side of the lip portion (2) further than the edge (4c) of the apex of the mountain of the seal lip (4) in the axial direction.
Description
technical field [0001] The present invention relates to a fluid seal for sealing a gap between parts that will rotate relatively, for example, a gap between a rotating shaft and a part through which the rotating shaft penetrates, and a shaft seal device and a pump device using the fluid seal . Background technique [0002] Among well-known fluid seals that seal the outer periphery of a rotating shaft, there is, for example, a structure disclosed in Patent Document 1 below. In the fluid seal described in this document, a seal lip formed of an elastic body is attached to an attachment ring fitted into a shaft hole. [0003] The base end of the seal lip is fixed to the inner diameter portion of the mounting ring, and the front end (free end) extends in the axial direction from the base end. In addition, the radially inner side of the seal lip is formed into a mountain shape in which the edge at the apex protrudes inward in the radial direction, and the periphery of the edge a...
Claims
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Patent Timeline
Login to View More IPC IPC(8): F16J15/32F16J15/54F04C2/10F04C15/00F04B53/00F16J15/3232F16J15/324F16J15/3252
CPCF16J15/3252F01C19/005F16J15/3276F04C15/0038F01C19/125F04C2240/52F04C15/0073F04C2/10
Inventor 久田庆武渕田刚
Owner ADVICS CO LTD