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Shaft-sealing device

A technology of shaft seals and seals, applied in the field of shaft seal devices, can solve the problems such as the reduction of the pressing force of the sealing lip 60, the mixing of the atmosphere, the leakage of the sealing fluid to the atmosphere side, etc. Effect

Active Publication Date: 2014-07-02
EAGLE INDS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the shaft sealing device that coats the sliding surface of the lip or the surface of the target shaft, and the shaft sealing device that optimizes the surface roughness of the target shaft, there is such a problem that it is only effective at the initial stage, and as time goes by , cannot continue low friction due to wear
[0008] But when Figure 10 In the shaft sealing device of prior art 1 shown, the sealing edge portion 53 of the lip seal 51 is in contact with the arrow-shaped groove portion 55 formed of a high-hardness material provided in the contact portion area 54 on the surface of the rotating shaft. With this structure, the wear of the sealing edge portion 53 is quick, and each groove 56 of the arrow-shaped groove portion 55 forms a “く-shaped” shape directly connecting the atmosphere side and the sealed fluid side along the axial direction, and the sealing edge portion 53 is not in contact with the く-shaped groove 56, so the sealed fluid side and the atmospheric side are always in a state of communication, so there is a possibility that the sealed fluid leaks to the atmospheric side in the static state of the device
In general oil seals, it is known that when the surface roughness of the shaft reaches 2.5 μm or more, leakage will occur at rest. In the case of prior art 1, if the depth of the groove 56 is more than 2.5 μm, leakage will occur at rest. serious leak
[0009] In addition, in the shaft seal device provided with a spiral groove instead of the arrow-shaped groove portion of prior art 1, since the atmospheric side and the sealed fluid side are also directly communicated by means of the spiral groove, there is a difference from the prior art. 1 same problem
[0010] and, in Figure 11 In the shaft seal device of the prior art 2 shown, there is a problem that the pressing force of the seal lip 60 is reduced due to the low torque of the seal lip 60, so that the sealing performance of the seal lip 60 is reduced, and air is mixed into the Sealed fluid side

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0058] figure 1 It is a longitudinal sectional view showing the shaft seal device according to Embodiment 1 of the present invention.

[0059] exist figure 1 In the casing 1, a rotating shaft through hole 3 is provided for inserting the rotating shaft 2, and the rotating shaft 2 is inserted through the rotating shaft through hole 3, and bearings, not shown, etc. The rotary shaft 2 is supported with play.

[0060] Here, among the rotating member and the fixing member arranged concentrically in the radially inner and outer sides, the housing 1 corresponds to the fixing member, and the rotating shaft 2 corresponds to the rotating member.

[0061] The shaft sealing device 10 is disposed between the rotating shaft 2 and the peripheral wall of the rotating shaft through hole 3 , and seals the sealed fluid side L and the atmospheric side A.

[0062] exist figure 1 Among them, the right side is the sealed fluid side L, and the left side is the atmospheric side A.

[0063] The ...

Embodiment approach 2

[0070] figure 2 It is a longitudinal sectional view showing the shaft seal device according to Embodiment 2 of the present invention.

[0071] exist figure 2 in, with figure 1 The same reference numerals as marked in the figure 1 Components that are the same as those in , detailed descriptions are omitted.

[0072] The shaft seal device 30 includes a lip seal 31 and is configured to partition an annular space where the casing 1 and the rotating shaft 2 face each other into two spaces, the sealed fluid side L and the atmospheric pressure side A, to isolate the inside and outside. The lip seal 31 is provided with a resin sealing lip member 32 having an L-shaped cross section, and the sealing lip member 32 is sandwiched between an outer joining metal ring 33 having a substantially L-shaped cross section and an inner pressing metal ring 34 having a substantially L-shaped cross section. hold.

[0073] A cylindrical lip 35 is formed on the inner peripheral side of the seali...

Embodiment approach 3

[0081] image 3 It is a longitudinal sectional view showing a shaft seal device according to Embodiment 3 of the present invention.

[0082] exist image 3 in, with figure 2 The same reference numerals as marked in the figure 1 Components that are the same as those in , detailed descriptions are omitted.

[0083] In the third embodiment, the sealing sleeve 4 is different from the second embodiment in that the rotating shaft 2 is fitted, but the other structure is the same as that of the second embodiment. On the outer peripheral surface S of the sleeve 4 , continuous The suction part 20 is formed in such a way that the suction action is generated by the relative rotation and sliding between the sealing lip member 32 and the rotating shaft 2 . Here, the sleeve 4 corresponds to a rotating member.

[0084] In addition, the structure of the suction part 20 is demonstrated in detail below.

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PUM

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Abstract

Provided is a shaft-sealing device capable of not leaking when stationary, preventing leakage and operating by fluid lubrication when rotating, including when starting to rotate, and balancing sealing and lubricating. A lip-seal shaft-sealing device provided with a lip seal is used for sealing the space between a rotating member and a fixed member which are arranged concentrically inside and outside one another in the radial direction thereof. The shaft-sealing device is characterized in that: the outer-circumferential surface of the rotating member has a pumping part for causing a pumping action to occur as a result of the relative rotating and sliding of the lip seal and the rotating member, and formed so as to connect in the circumferential direction; the pumping part is configured in a manner such that an intake pumping part for pumping fluid to be sealed in an intake direction and a discharge pumping part for pumping the fluid to be sealed in a discharge direction are each independently positioned; and with the exception of one section on the fluid-to-be-sealed side of the pumping part, the lip of the lip seal extends in the axial direction on the atmosphere side.

Description

technical field [0001] The present invention relates to a shaft sealing device of a lip seal for sealing between a casing and a rotating shaft. Background technique [0002] In the past, in the lip seal installed in the fixed housing and slidingly sealed on the surface of the rotating shaft, in order to cope with environmental problems, by optimizing the shape, size and material of the lip, the sliding surface of the lip or the surface of the target shaft Low friction can be achieved by optimizing the coating and the surface roughness of the target shaft. [0003] In the shaft sealing device that applies a coating to the sliding surface of the lip or the surface of the target shaft, and the shaft sealing device that optimizes the surface roughness of the target shaft, there is a problem that it is effective only at the initial stage, and as time goes by , cannot continue low friction due to wear. [0004] On the other hand, as a shaft seal device with good lubricating prop...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16J15/32
CPCF16J15/3244
Inventor 大岛宏树真田雅光细江猛
Owner EAGLE INDS