CN112253534A

CN112253534A - Oil seal for compressor

Info

Publication number: CN112253534A
Application number: CN202011112362.1A
Authority: CN
Inventors: 金镇亨
Original assignee: Hanwha Power Systems Corp
Current assignee: Hanwha Power Systems Corp
Priority date: 2012-04-16
Filing date: 2013-04-16
Publication date: 2021-01-22
Anticipated expiration: 2033-04-16
Also published as: KR101912799B1; CN103375427A; KR20130116676A; CN112253534B

Abstract

An oil seal for a compressor is provided. The oil blanket is installed on the rotation axis of compressor, the oil blanket includes: a hollow cylindrical body having a hole through which the rotation shaft passes; a protrusion protruding radially outward from the main body along an outer circumference of the main body; a groove formed on an upstream side of a moving direction of the oil with respect to the protrusion, wherein the oil moves toward the protrusion along an outer surface of the main body during operation of the compressor; an oil discharger through which the oil introduced into the groove is discharged.

Description

Oil seal for compressor

The application is a divisional application of an invention patent application with application date of 2013, 16/04, application number of 201310132106.2 and invention name of "oil seal for compressor".

Technical Field

The present invention relates to an oil seal for a compressor, and more particularly, to an oil seal for a compressor, which is designed to discharge oil flowing along a surface thereof during operation of the compressor.

Background

Generally, a compressor receives fluid from the outside, compresses the fluid, and supplies the compressed fluid to another device. A rotary shaft and an impeller coupled to the rotary shaft may be installed in the compressor. Specifically, an impeller is disposed about the diffuser and collector such that fluid flows through the impeller.

A bearing may also be provided in the compressor to support the rotation of the rotating shaft. Oil may be supplied to a rotating member, such as a bearing or a rotating shaft, to facilitate rotation of the rotating member. The supplied oil may flow in different directions when the bearing and the rotation shaft rotate. Specifically, the oil may flow from the bearing toward an impeller mounted to the rotating shaft.

When the oil flows as described above, the oil may contaminate the impeller or other devices in the vicinity of the impeller. In particular, when oil leaks through the collector, the leaking oil may seriously affect the operation of the apparatus using the fluid supplied from the collector. In order to suppress the flow of oil, an oil seal for a compressor may be installed by being inserted into a rotating shaft.

An oil seal for a compressor is described in detail in Japanese patent application laid-open No. 1996 + 135458 (applicant: Toyota automobile Co., Ltd.) relating to the structure of an oil seal for a supercharger.

Prior art references:

japanese patent application laid-open No. 1996-135458

Japanese patent application laid-open No. 1998-

Disclosure of Invention

The present invention provides an oil seal for a compressor, which is designed to prevent oil from flowing to and leaking through a gas seal.

According to an aspect of the present invention, there is provided an oil seal for a compressor, the oil seal being mounted on a rotating shaft of the compressor, the oil seal comprising: a hollow cylindrical body having a hole through which the rotation shaft passes; a protrusion protruding radially outward from the main body along an outer circumference of the main body; a groove formed on an upstream side of a moving direction of the oil with respect to the protrusion, wherein the oil moves toward the protrusion along an outer surface of the main body during operation of the compressor; an oil discharger through which the oil introduced into the groove is discharged.

The grooves may be multi-stepped.

The groove may include: an oil sump in which oil flows; and an oil ring groove disposed between the protrusion and the oil groove and recessed more toward the center of the main body than the oil groove, wherein the oil ring is fixedly inserted into the oil ring groove.

The groove may be continuously formed along the outer circumference of the body to be connected with the drain.

An oil seal for a compressor is designed to prevent oil from entering and leaking through a gas seal, thereby effectively retaining oil required to lubricate a rotating shaft. In addition, the oil intercepted by the groove can be discharged to a safe place, thereby preventing contamination of the oil seal for the compressor or its adjacent area, thus extending the life of the compressor.

Drawings

The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings, in which:

FIG. 1 is a perspective view of an oil seal for a compressor according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line II-II in FIG. 1;

fig. 3 is a sectional view of a compressor to which the oil seal for a compressor of fig. 1 is mounted;

fig. 4 is an enlarged sectional view of a portion a shown in fig. 3.

Detailed Description

Exemplary embodiments will now be described more fully hereinafter with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey exemplary embodiments to those skilled in the art. The terminology used in the description is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. It will be understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. It will be further understood that, although the terms first, second, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms.

Fig. 1 is a perspective view of an oil seal 100 for a compressor according to an embodiment of the present invention. Fig. 2 is a sectional view taken along line II-II in fig. 1.

Referring to fig. 1 and 2, an oil seal 100 for a compressor includes a hollow cylindrical body 110 having a hole through which a rotating shaft (not shown) passes. In this case, the body 110 may have a ring shape to accommodate the rotation shaft.

The oil seal 100 for a compressor may include a protrusion 120 protruding radially outward from the main body 110 along the outer circumference of the main body 110. The protrusion 120 extends outwardly from the body 110 and may be inserted into a gearbox housing (not shown) described below to be secured to the gearbox housing.

The oil seal 100 for a compressor may have a groove 130, and the groove 130 is formed on an upstream side in a direction in which oil flows, as compared to the protrusion 120 located on the main body 110. The groove 130 may be continuously formed along the outer circumference of the body 110. The groove 130 may also be multi-stepped.

More specifically, the height of the groove 130 may decrease as the groove 130 proceeds from the upstream side toward the downstream side in the oil inflow direction, as compared to the protrusion 120. For example, the distance from the center of the body 110 to the bottom surface of the groove 130 on the upstream side of the oil inflow direction may be greater than the distance from the center of the body 110 to the bottom surface of the groove 130 on the downstream side of the oil inflow direction.

The groove 130 includes: an oil groove 131 through which oil flows; and an oil ring groove 133 disposed between the protrusion 120 and the oil groove 131. In this case, the oil ring groove 133 may be recessed more toward the center of the body 110 than the oil groove 131. The oil ring 150 may be inserted into the oil ring groove 133, thereby preventing oil from flowing toward the protrusion 120.

The oil seal 100 for a compressor may further include an oil discharger 140, and the oil discharger 140 discharges oil introduced and collected in the groove 130. The oil discharger 140 may be connected to the groove 130 to discharge the oil flowing in the groove 130.

Specifically, the oil discharger 140 has an oil storage space 141 for temporarily storing the oil flowing in the groove 130. The oil discharger 140 may also be provided on an outer surface of the body in a gravity direction to discharge oil. Specifically, the oil discharger 140 may be provided at a lower end of the body 110 shown in a sectional view in fig. 2.

Now, the installation and operation of the oil seal 100 for a compressor will be described in more detail with reference to fig. 3 and 4.

Fig. 3 is a sectional view of a compressor 1000 to which the oil seal 100 for a compressor in fig. 1 is mounted, and fig. 4 is an enlarged sectional view of a portion a shown in fig. 3.

Referring to fig. 3 and 4, the compressor 1000 includes: a housing 200 into which air is introduced from the outside; an impeller 300 rotatably installed in the housing 200; a diffuser 400 provided on the casing 200 and located at a side of the impeller 300; scroll 500 is provided on the side of housing 200. The compressor 1000 may further include a rotation shaft 600 coupled with the impeller 300 to rotate the impeller 300 and a driven gear 700 engaged with a portion of the rotation shaft 600 at a predetermined angle to rotate with the rotation shaft 600.

The compressor 1000 further includes: a gear box case 800 enclosing a portion of the driven gear 700 and a portion of the rotation shaft 600; an oil seal 100 for a compressor, which is accommodated in the gear case housing 800 and is adjacent to the impeller 300; and a gas seal 900 disposed between the oil seal 100 for the compressor and the impeller 300. Since the compressor 1000 has substantially the same structure as that of a general compressor except for the oil seal 100 for the compressor, a detailed description of the same structure is omitted herein. Hereinafter, for convenience of explanation, the oil seal 100 for the compressor is mainly described.

An oil seal 100 for a compressor is provided on an outer surface of a rotating shaft 600, and the rotating shaft 600 is inserted into the oil seal 100. In this case, an oil seal 100 for the compressor may be installed.

Alternatively, two oil seals 100 for a compressor may be employed to seal the outer circumference of the rotating shaft 600. For example, the oil seal 100 for a compressor may include a first oil seal for a compressor provided on a front portion of the rotary shaft 600 and a second oil seal for a compressor provided on a rear portion of the rotary shaft 600 to face the first oil seal 100 for a compressor. For convenience of explanation, it is assumed hereinafter that an oil seal 100 for a compressor is inserted into the rotary shaft 600. If the oil seal 100 for the compressor includes the first oil seal and the second oil seal, the oil seal 100 may also be installed or operated in the same manner as the oil seal 100 including a single oil seal is installed or operated.

After the oil seal 100 for the compressor is installed in the rotary shaft 600 as described above, the rotary shaft 600 may be installed in the compressor 1000. In this case, the impeller 300 is disposed on the rotating shaft, and the gas seal 900 is interposed between the impeller 300 and the oil seal 100 for the compressor. The protrusion 120 is engaged in the gearbox housing 800. To this end, the protrusion 120 may be inserted into the gearbox housing 800. Specifically, a bearing member (not shown) is coupled with the rotation shaft 600 to rotatably support the rotation shaft 600.

When the compressor 1000 having the above structure is operated, the rotation shaft 600 may be rotated. When the rotation shaft 600 rotates, the rotation shaft 600 may contact a plurality of components, causing friction between the rotation shaft 600 and the plurality of components. For example, during rotation, friction may occur at a portion of the rotation shaft 600 that contacts the bearing member. In order to reduce such friction caused by the rotation of the rotation shaft 600, oil may be supplied to the bearing member and the area around the rotation shaft 600. The supplied oil may be collected between the bearing member and the oil seal 100 for the compressor.

When the oil seal 100 for a compressor is installed as described above, a gap may be formed between the gear box housing 800 and the outer surface of the oil seal 100 for a compressor. More specifically, a gap may be formed between an outer surface of the body 110 or an outer surface of the protrusion 120 and the gearbox housing 800.

Specifically, during engagement between the gearbox housing 800 and the protrusion 120, a force is applied to the gearbox housing 800 and the gearbox housing 800 engages with the protrusion 120, thereby creating a gap between the gearbox housing 800 and the protrusion 120. The oil collected between the bearing member and the oil seal 100 for the compressor may flow into the gap by capillary action.

Further, the impeller 300 mounted on the rotation shaft 600 is disposed in front of the oil seal 100 for the compressor to rotate. As the impeller 300 rotates, external air is introduced and moves through a gap between the casing 200 and the air seal 900. The air may splash oil flowing through the clearance to the area around the gas seal 900 and oil seal 100. The splashed oil contaminates the inner space of the compressor 1000.

When oil passes through the oil seal 100 for a compressor and flows toward the gas seal 900, the oil may leak into the impeller 300 or leak to the outside through a gap between the gas seal 900 and the casing 200.

Oil flowing along the outer surface of the oil seal 100 for the compressor may be collected in the groove 130. More specifically, when oil flows along the outer surface of the oil seal 100 for a compressor toward the protrusion 120 and reaches the oil groove 131, the oil may move along the oil groove 131. More specifically, since a space is created between the oil groove 131 and one side of the gear case housing 800, the oil does not undergo any further movement due to capillary action but moves through the oil groove 131. Further, when the oil ring 150 is disposed in the oil ring groove 133, the oil does not pass through the oil groove 131 and moves further toward the protrusion 120.

The oil may move in one direction through the oil groove 131. Specifically, the oil may move in the direction of gravity due to gravity.

In this case, when the oil reaches the oil discharger 140, the oil does not undergo any further movement but is temporarily stored in the oil storage space 141. When oil accumulates in the oil drain 140 such that the weight of the oil exceeds a predetermined weight, the oil may be pumped out through the oil drain 140.

The oil seal 100 for the compressor is designed to prevent oil from flowing to the gas seal 900 and leaking through the gas seal 900, thereby effectively retaining oil required to lubricate the rotating shaft 600. In addition, the oil intercepted by the groove 130 may be discharged to a safe place, thereby preventing contamination of an oil seal for the compressor or its adjacent area, thus extending the life of the compressor.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.

Claims

1. An oil seal for a compressor, the oil seal being mounted on a rotating shaft of the compressor, the oil seal comprising:

a hollow cylindrical body having a hole through which the rotation shaft passes;

a protrusion protruding radially outward from the main body along an outer circumference of the main body;

a groove formed on an upstream side of a moving direction of the oil with respect to the protrusion, wherein the oil moves toward the protrusion along an outer surface of the main body during operation of the compressor;

an oil discharger through which the oil introduced into the groove is discharged,

wherein the groove comprises: an oil sump in which oil flows; an oil ring groove provided between the protrusion and the oil groove, into which the oil ring is fixedly inserted,

the oil discharger has an oil storage space for temporarily storing the oil flowing in the groove,

wherein the oil groove is located between the oil ring groove and the oil storage space in an axial direction of the rotary shaft,

wherein a distance from a bottom surface of the oil storage space to a center of the hollow cylindrical body is smaller than a distance from a bottom surface of the oil groove to the center of the hollow cylindrical body.

2. An oil seal as defined in claim 1, wherein the groove is multi-stepped.

3. An oil seal as defined in claim 1, wherein the oil ring groove is recessed more toward the center of the main body than the oil groove.

4. An oil seal as defined in claim 1, wherein the groove is formed continuously along the outer periphery of the main body to connect with the oil drain.