CN106537004A - Sealing device - Google Patents

Abstract

The present invention provides a sealing device (100) capable of easily performing an installation operation for sealing an annular gap between a shaft housing (200) and a shaft (300) that rotates relative to each other, the sealing device (100) comprising: the shaft seal device comprises a sleeve (110) fixed to a shaft (300), a housing (130) fixed to a shaft housing (200), an end face seal (140) fixed to the sleeve (110) and having a lip (141) that slides freely with respect to an end face of the housing (130), and an attachment plate (150) that temporarily fixes the sleeve (110) and the housing (130), and is detached after the housing (130) is fixed to the shaft housing (200) and the sleeve (110) is fixed to the shaft (300).

Description

Sealing means

technical field

The invention relates to a sealing device with end face sealing.

Background technique

Conventionally, there is known a technique using an end face seal in order to seal an annular gap between a relatively rotating shaft and a shaft housing. For example, a technique is known in which a sleeve is fixed to a shaft, a housing is fixed to a shaft housing, and an end face seal having a lip that slides freely with respect to the end face of the housing is fixed to the sleeve (see Patent Document 1). Conventionally, with this technique, after fixing the sleeve to the shaft, the end face seal is fixed to the sleeve in a state where the end seal is positioned, and then the housing is attached to the shaft housing. Thus, it is necessary to sequentially fix the sleeve, the face seal, and the housing to the device having the shaft and the shaft housing, and the installation operation takes time.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2014-74430

Contents of the invention

The problem to be solved by the present invention

The object of the present invention is to provide a sealing device which can be easily installed.

means to solve the problem

In order to solve the above-mentioned problems, the present invention employs the following means.

That is, the sealing device of the present invention is used to seal the annular gap between the relatively rotating shaft and the shaft housing, and the sealing device is characterized in that it has:

a sleeve fixed to the shaft;

a housing fixed to the axle housing;

a face seal secured to the sleeve and having a lip that slides freely relative to the face of the housing; and

The mounting plate, which temporarily fixes the sleeve and the housing, is removed after fixing the housing to the shaft housing and fixing the sleeve to the shaft.

It should be noted that the sequence of fixing the shell to the shaft shell and the sleeve to the shaft can be reversed.

According to the present invention, by temporarily fixing the sleeve and the case with the mounting plate while the end seal is fixed to the sleeve, the sleeve, the end seal, and the housing can be fixed while being positioned. Thereby, the sealing device including the sleeve, the end face seal, and the housing can be handled as a single component. In addition, after the housing is fixed to the shaft housing and the sleeve is fixed to the shaft, it is only necessary to detach the mounting plate, so that the sealing device can be easily mounted.

Preferably the housing has:

the cylindrical portion; and

an inward flange portion extending radially inward from the end portion of the cylindrical portion on the side opposite to the sealing object,

The lip portion of the end face seal is slidable with respect to the end face of the inward flange portion on the sealing target side.

Thereby, it is possible to seal between the end seal and the housing in a state where the end seal is accommodated in the housing.

Preferably the housing has:

an annular portion extending from the inward flange portion to the opposite side to be sealed; and

an annular groove provided on the outer peripheral surface side of the annular portion,

An annular protrusion protruding radially outward is provided on the outer peripheral surface side of the sleeve, and

The mounting plate has:

a first protrusion engaged with the annular groove; and

a second protrusion clamped between the annular portion and the annular protrusion,

The mounting plate is fixed to the sleeve in a state where the first protrusion is engaged with the annular groove, and the second protrusion is in close contact with both the annular portion and the annular protrusion, The housing and the sleeve are thereby positioned axially.

In addition, it is preferable that the mounting plate is fixed to the sleeve in a state where the mounting plate and the annular portion abut in the radial direction, and the mounting plate is fixed at a plurality of locations in the circumferential direction, whereby The housing and the sleeve are positioned radially.

Invention effect

As described above, according to the present invention, the installation operation of the sealing device can be easily performed.

Description of drawings

Fig. 1 is a top view of a sealing device according to an embodiment of the present invention.

Fig. 2 is a perspective view of the mounting plate of the embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view showing a state during installation of the sealing device of the embodiment of the present invention.

Fig. 4 is a schematic sectional view showing the usage state of the sealing device according to the embodiment of the present invention.

detailed description

Hereinafter, referring to the drawings, embodiments for implementing the present invention will be described in detail based on examples. However, the scope of the present invention is not limited to the dimensions, materials, shapes, relative arrangements, and the like of the constituent elements described in this embodiment, unless otherwise specified.

(Example)

Referring to FIGS. 1 to 4 , a sealing device according to an embodiment of the present invention will be described.

<Structure of sealing device>

In particular, the structure of the sealing device of this embodiment will be described with reference to FIGS. 1 to 3 . Fig. 1 is a top view of a sealing device according to an embodiment of the present invention. Fig. 2 is a perspective view of the mounting plate of the embodiment of the present invention. Fig. 3 is a schematic cross-sectional view showing a state during installation of the sealing device of the embodiment of the present invention. It should be noted that the sealing device in FIG. 3 is a sectional view along AA in FIG. 1 .

The sealing device 100 of this embodiment serves to seal the annular gap between the relatively rotating shaft 300 and the shaft housing 200 . Furthermore, the sealing device 100 includes a metal sleeve 110 fixed to the shaft 300 , a metal housing 130 fixed to the shaft housing 200 , and an end face seal 140 made of elastic material such as rubber fixed to the sleeve 110 .

A metal sleeve ring 120 as an annular protrusion protruding radially outward is provided on the outer peripheral surface side of the sleeve 110 . The sleeve 110 and the sleeve ring 120 are provided with through holes 111 and 121 , and internal threads are respectively formed on the inner peripheral surfaces thereof. The sleeve ring 120 is fixed to the sleeve 110 by screwing the set screws 181 into the through holes 111 and 121 . In addition, the sleeve 110 can be fixed to the shaft 300 together with the sleeve ring 120 by the set screw 181 . By removing the set screw 181 , the sleeve ring 120 can be removed from the sleeve 110 and the sleeve 110 can also be removed from the shaft 300 . In addition, an annular groove 112 is formed on the inner peripheral surface side of the sleeve 110 , and a seal ring 161 is mounted in the annular groove 112 . Thereby, the annular gap between the shaft 300 and the sleeve 110 is sealed.

The housing 130 integrally includes a cylindrical portion 131 , an outward flange portion 132 , an inward flange portion 133 , and an annular portion 134 extending from the inward flange portion 133 to the side (L) opposite to the sealing target side (H). The outward flange portion 132 is configured to extend radially outward from the end portion of the cylindrical portion 131 on the sealing target side (H). A gasket 162 is attached between the outward flange portion 132 and the end surface (L) of the axle housing 200 opposite to the sealing target side (H). Thereby, the gap between the shaft housing 200 and the housing 130 is sealed. In addition, the outward flange portion 132 is provided with a plurality of through holes 132 a (four in the illustrated example) through which shaft portions of bolts 183 for fixing the sealing device 100 to the shaft housing 200 are inserted.

The inward flange portion 133 is configured to extend radially inward from the end portion of the cylindrical portion 131 on the side (L) opposite to the sealing target side (H). A gap is formed between the inner peripheral end of the inward flange portion 133 and the sleeve 110 so as not to affect the rotation of the shaft 300 which rotates together with the sleeve 110 . Further, an annular groove 135 is provided on the outer peripheral surface side of the annular portion 134 extending from the inner peripheral end portion of the inward flange portion 133 to the side (L) opposite to the sealing target side (H). It should be noted that, in the case of a large device and a large case 130, the following ring-shaped case can also be used. The annular case is formed by dividing the parts divided in the circumferential direction by using bolts and tapered pins. etc. are fixed, and thus obtained by connecting multiple parts. In this way, maintenance can be facilitated.

The end face seal 140 is fixed to the outer peripheral surface of the sleeve 110 in a state where the end face seal 140 is positioned in the axial direction. It should be noted that “axial” refers to the direction of the centerline of the shaft 300 . The following are the same. In addition, the end face seal 140 includes a lip portion 141 that is slidable with respect to the end face of the sealing target side (H) of the inward flange portion 133 of the housing 130 . Thus, in a state where the end seal 140 is accommodated in the housing 130 , it is possible to seal between the end seal 140 and the housing 130 . In addition, the end face seal 140 is provided with a load bearing portion 142, and the posture of the end face seal 140 can be maintained even if the pressure of the sealing target fluid from the sealing target side (H) is high. It should be noted that when the fluid pressure is high, the posture of the end face seal 140 can be maintained by the load bearing portion 142 abutting against the end face on the seal target side (H) of the inward flange portion 133 . In addition, a garter spring 170 for increasing the fastening force of the end seal 140 to the sleeve 110 is attached to the outer peripheral surface side of the end seal 140 .

Furthermore, in this embodiment, the mounting plate 150 made of resin such as ABS is provided, and the sealing device 100 including the sleeve 110, the end seal 140, and the housing 130 can be handled as a single component. Since the mounting plate 150 is provided for temporarily fixing the sleeve 110 and the housing 130 , it is removed after the housing 130 is fixed to the shaft housing 200 and the sleeve 110 is fixed to the shaft 300 .

As shown in FIG. 2 , the mounting plate 150 is formed by forming a first protrusion 151 , a second protrusion 152 , and a through-hole 153 on a substantially flat member. In addition, the first protruding portion 151 is used to engage with the annular groove 135 provided on the outer peripheral surface side of the annular portion 134 in the housing 130 . The second protruding portion 152 is used to be clamped between the annular portion 134 on the housing 130 and the sleeve ring 120 when the mounting plate 150 is fixed to the sleeve 110 . Furthermore, the mounting plate 150 is fixed to the sleeve 110 by passing the bolt 182 through the through hole 153 and screwing it into the through hole 122 provided in the sleeve ring 120 . It should be noted that a female thread is formed on the inner peripheral surface of the through hole 122 .

In a state where the first protrusion 151 is engaged with the annular groove 135 and the second protrusion 152 is in close contact with both the annular portion 134 and the sleeve ring 120 , the mounting plate 150 and the sleeve configured as above are connected by bolts 182 . The cartridge 110 is fixed. Thus, the housing 130 and the sleeve 110 are fixed in a state where the housing 130 and the sleeve 110 are positioned in the axial direction.

In addition, the mounting plate 150 and the sleeve 110 are fixed in a state where the mounting plate 150 is in radial contact with the annular portion 134 of the housing 130 . It should be noted that, in order to make the mounting plate 150 abut against the annular portion 134 in the radial direction, it is only necessary to abut the first protruding portion 151 of the mounting plate 150 against the groove bottom of the annular groove 135 . Alternatively, the portion of the annular portion 134 not provided with the annular groove 135 may abut against the portion between the first protrusion 151 and the second protrusion 152 on the mounting plate 150 . Then, the mounting plate 150 is fixed at multiple positions in the circumferential direction (four positions in this embodiment), so that the housing 130 and the sleeve 110 are positioned in the radial direction. 110 fixed.

With the above structure, the sealing device 100 including the sleeve 110, the end face seal 140, and the housing 130 can be handled as a single component. And, the sleeve 110 , the end face seal 140 and the housing 130 are fixed in a state where they are positioned in the axial and radial directions.

<How to install the seal>

A method of attaching the sealing device 100 to a device including the shaft 300 and the shaft housing 200 will be described with particular reference to FIGS. 3 and 4 . As described above, the sealing device 100 including the sleeve 110, the end seal 140, and the housing 130 can be handled as a single component. First, the sealing device 100 is fixed to the shaft housing 200 with a plurality of (four in this embodiment) bolts 183 . It should be noted that, in a state where the shaft portion of the bolt 183 is inserted into the through hole 132a provided in the outward flange portion 132 of the housing 130, the bolt 183 is fixed to the shaft housing 200, whereby the sealing device 100 is fixed to the shaft housing. 200. At this time, the sealing device 100 is fixed in a state where the gasket 162 is attached between the outward flange portion 132 and the end surface of the shaft housing 200 . Next, the sleeve 110 is fixed to the shaft 300 by screwing in the set screw 181 . It should be noted that the order of fixing the housing 130 to the shaft housing 200 and fixing the sleeve 110 to the shaft 300 may be reversed. FIG. 3 shows a state where the housing 130 is fixed to the shaft housing 200 and the sleeve 110 is fixed to the shaft 300 .

In this way, after the housing 130 is fixed to the shaft housing 200 and the sleeve 110 is fixed to the shaft 300 , the mounting plate 150 is detached by detaching the bolt 182 . FIG. 4 shows the state after the mounting plate 150 is removed. By completely removing the mounting plate 150 , the sleeve 110 is not constrained by the housing 130 . However, since the sleeve 110 is fixed to the shaft 300 and the housing 130 is fixed to the shaft housing 200 , the positional relationship between the sleeve 110 and the housing 130 can be maintained in the axial direction. Also, for example, when the shaft 300 rotates relative to the stationary shaft housing 200 , the housing 130 fixed to the shaft housing 200 can remain stationary, and the sleeve 110 and the face seal 140 rotate together with the shaft 300 . In addition, since the positional relationship between the sleeve 110 and the housing 130 is maintained in the axial direction, the sliding state of the lip portion 141 of the end face seal 140 and the inward flange portion 133 can be stably maintained. Therefore, leakage of the sealing target fluid from the sealing target side (H) to the opposite side (L) can be suppressed.

<Advantages of the sealing device of this embodiment>

According to the sealing device 100 of this embodiment, when the end face seal 140 is fixed to the sleeve 110, the sleeve 110 and the housing 130 are temporarily fixed by the mounting plate 150, so that the sleeve 110, the end face seal 140 and the sleeve 110 can be fixed. The casing 130 is fixed in a state where it is positioned. Thus, the sealing device 100 including the sleeve 110, the end face seal 140, and the housing 130 can be handled as a single component. Furthermore, after the housing 130 is fixed to the shaft housing 200 and the sleeve 110 is fixed to the shaft 300, only the installation plate 150 needs to be detached, so the sealing device 100 can be easily installed.

(other)

In the above-described embodiment, the case where the sleeve ring 120 as the annular protrusion is detachably attached to the sleeve 110 is shown in order to easily replace the end face seal 140 . However, there may be cases where the sleeve ring 120 does not need to be attached or detached from the sleeve 110 when a method different from the above-described method is adopted as the replacement method of the end face seal 140 . In this case, an annular protrusion corresponding to the sleeve ring 120 may be integrally provided with the sleeve 110 .

Explanation of reference signs

100 sealing device

110 sleeve

111 through hole

112 Annular groove

120 sleeve ring

121, 122 through holes

130 shell

131 Cylindrical part

132 Outward flange

132a Through hole

133 Inward flange part

134 Annulus

135 annular groove

140 face seal

141 Lips

142 load-bearing part

150 mounting plate

151 First protrusion

152 Second protrusion

153 through hole

161 sealing ring

162 Spacers

170 garter spring

181 set screw

182, 183 bolts

200 shaft housing

300 axis

Claims (4)

1. a kind of sealing device, which is used to sealing the annular gap between the axle and axle housing for rotating against, the sealing device It is characterised by possessing：

Sleeve, which is fixed on the axle；

Shell, which is fixed on the axle housing；

End face seal, which is fixed on the sleeve, and the lip with the end face relative to the shell slidably；And

Installing plate, which is fixed temporarily to the sleeve and shell, and the shell is being fixed on the axle housing and will be described After sleeve is fixed on the axle, it is disassembled.

2. sealing device according to claim 1, it is characterised in that

The shell possesses：

Cylindrical portion；And

Inward flange portion, which extends from the end of the sealed object opposition side of the cylindrical portion to radially inner side,

The lip of the end face seal relative to the sealed object side in the inward flange portion end face slidably.

3. sealing device according to claim 2, it is characterised in that

The shell possesses：

Annulus, which extends from the inward flange portion to sealed object opposition side；And

Endless groove, which is arranged on the periphery surface side of the annulus,

In the periphery surface side of the sleeve, the cyclic lug prominent to radial outside is set, and

The installing plate possesses：

First connecting portion, which is engaged with the endless groove；And

Second connecting portion, which is clamped between the annulus and cyclic lug,

Engage with the endless groove in first connecting portion, and second connecting portion is close with the both sides of the annulus and cyclic lug In the state of conjunction, the installing plate is fixed on into the sleeve, thus in the axial direction the shell and sleeve are positioned.

4. sealing device according to claim 3, it is characterised in that

In the state of the installing plate is diametrically abutted with the annulus, the installing plate is fixed on into the sleeve, And the installing plate is fixed in circumferential multiple positions, and thus diametrically the shell and sleeve are positioned.