JP2003028308A - Annular member attaching structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily prevent erroneous attachment in a surface-back inverting state of an annular member such as a slinger or a seal ring. SOLUTION: An engaging groove 42 extending from an upper surface of a lower housing 41 along a circumferential direction is formed in a storage portion 33 of an attaching groove 31 in one side portion side of the lower housing 41. A projecting portion 43 inserted in the engaging groove 42 when fitted with the attaching groove 31 is provided in a lower half side of slingers 21, 22. The slingers 21, 22 are prohibited to be fitted with the attaching groove 31 in a surface-back inverting state, and a problem such as a fault of a seal due to surface-back inverting erroneous attachment is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure for an annular member such as an oil drainer provided in a main oil pump or the like which is connected to a main shaft of a steam turbine or the like and supplies lubricating oil to a driving portion. is there.

[0002]

2. Description of the Related Art Conventionally, a steam turbine or the like is provided with a main oil pump which is connected to a main shaft of the steam turbine and supplies lubricating oil to each drive portion. This main oil pump is shown in FIGS.
As shown in FIG. 3, a lower housing 1 and an upper housing 2 attached to the upper portion of the lower housing 1 are provided with a housing 3 in which a rotation connected to a rotor 4 of a steam turbine is performed. The shaft 5 is supported horizontally. An oil suction port 6 and an oil discharge port 7 are formed in the housing 3, and a suction pipe line 8 is connected to the oil suction port 6 so that lubricating oil is returned from each drive unit. A discharge pipe line 9 is connected to 7 so that the lubricating oil is sent to each drive unit.

In the housing 3, a spiral oil flow passage 11 communicating with the oil suction port 6 and the oil discharge port 7 is formed. Further, the rotary shaft 5 is provided with a pump impeller 12, and when the pump impeller 12 is rotated together with the rotary shaft 5, the lubricating oil sent from the oil suction port 6 passes through the oil passage 11. The oil is discharged to the oil discharge port 7. In the main oil pump having the above structure, the oil drainers 21, 2 are provided between the rotary shaft 5 and the housing 3 and between the shroud 12a of the pump impeller 12 and the housing 3.
2 is provided, and these oil drainers 21 and 22 allow the leakage of lubricating oil from the inside of the housing 3 to the outside and the discharge side flow path to the suction side flow path 11a in the oil flow path 11 formed in the housing 3. The leak from 11b is suppressed. As shown in FIG. 8, the oil drainers 21 and 22 are formed in an annular shape having spiral-shaped seal grooves 21a and 22a formed in a direction in which the leakage of the lubricating oil is suppressed with respect to the rotation direction of the rotating shaft 5. Has been done.

As shown in FIGS. 9 to 11, the oil drainers 21 and 22 are divided into halves, and by connecting the halved members to each other with a pin 23, a ring shape is obtained. Has become. Also, this oil drainer 21, 2
On the outer peripheral surface on the lower side of the second member 2, a rotation stopping protrusion 24 is formed which gradually protrudes in the rotation direction of the rotating shaft 5. The oil drainers 21 and 22 are shown in FIG. 12 and FIG.
As shown in FIG. 3, the lower half on which the rotation stopping protrusion 24 is formed is an arc-shaped mounting groove 31 formed on the lower housing 1.
Further, the upper half is fitted and held in an arcuate mounting groove 32 formed in the upper housing 2.

Here, an arcuate storage portion 33 is formed in the mounting groove 31 formed in the lower housing 1 so as to extend in the circumferential direction, and an oil drainer is formed in the mounting groove 31 in the storage portion 33. When 21 and 22 are fitted, the rotation stopper ridge 24
Are arranged. Further, according to the main oil pump having the oil drainers 21 and 22 having the above structure, the rotary shaft 5
Is rotated by the sealing surface formed of the inner peripheral surface having spiral-shaped sealing grooves 21a, 22a formed in the direction of suppressing the leakage of the lubricating oil with respect to the rotation direction of the rotating shaft 5. The seal of the lubricating oil in the axial direction around the rotary shaft 5 is reliably maintained. At this time, the rotating shaft 5 acts on the oil drainers 21 and 22 in the same direction as the rotation direction of the rotating shaft 5. Since the rotation stopping ridge 24 is formed so as to gradually project in the rotation direction, the rotation stopping ridge 24 contacts the upper housing 2 and is prevented from being rotated together with the rotation shaft 5.

[0006]

By the way, in the main oil pump having the above structure, there is a risk that the oil drainers 21 and 22 may be confused with those facing each other when assembled during maintenance or the like. That is, as shown in FIG. 14, there is a risk that one of the oil drainers 21 and 22 may be fitted into the other mounting groove 31 on the opposite side in a state of being turned upside down. In this way, when the mounting groove 31 is mounted in the other mounting groove 31 on the opposite side in the state of being turned upside down, the spiral seal grooves 21a and 22a formed on the inner peripheral surface, which is the seal surface, are reversed. Therefore, when the rotating shaft 5 is rotated, the lubricating oil may leak through the seal grooves 21a and 22a.

Further, in the case where the rotary shaft 5 is mounted upside down as described above, the oil drainers 21 and 22 are rotated along with the rotation of the rotary shaft 5, and as shown in FIG. Of the rotation stopper ridge 24, and the oil drainers 21 and 22 are cut into the mounting groove 32 of the rotation stopper protrusion 24.
Displaced to the side opposite to the side that bites into 2, and the oil drainers 21, 22
There is a risk that the sealing surface, which is the inner peripheral surface of, will come into contact with the outer peripheral surface of the rotating shaft 5 and adversely affect it.

The present invention has been made in view of the above circumstances, and provides a mounting structure of an annular member which can very easily prevent erroneous mounting such as oil draining when the annular member is turned upside down. The purpose is to do.

[0009]

In order to achieve the above-mentioned object, the mounting structure for an annular member according to claim 1 has a rotating shaft supported rotatably in a housing composed of a lower housing and an upper housing. In the structure for mounting a plurality of annular members such as oil drainers and seal rings in the axial direction on the housing, the lower housing has a mounting groove into which the lower half of the annular member can be fitted. Is formed in the mounting groove on one side of the lower housing,
An engagement groove communicating with the upper surface side of the lower housing is formed, and when the front half and the back surface of the annular member are fitted in the mounting groove in a predetermined direction, It is characterized in that a projection portion to be inserted into the engagement groove is provided.

In this way, the engaging groove communicating with the upper surface of the lower housing is formed in the mounting groove on one side of the lower housing, and when the lower half of the annular member is fitted into the mounting groove, Since the protrusions that are inserted into the engagement grooves are provided, the fitting of the annular member into the mounting groove in the inverted state is prohibited. As a result, for example, when applied to an annular member having a spiral sealing groove formed on the inner peripheral surface and having a fixed sealing direction, such as an oil drainer provided around the rotation axis of the main oil pump, Problems such as inadequate seals due to reversed installation are eliminated.

According to a second aspect of the present invention, there is provided an annular member attachment structure according to the first aspect, wherein the annular members have front and back asymmetrical outer shapes and are opposed to each other around the rotation axis. And the mounting grooves formed in the lower housing into which the annular members are fitted are formed in a cross-sectional shape that allows the pair of opposed annular members to be fitted in predetermined directions on the front and back sides, respectively. It is characterized by that.

That is, even if one of the pair of annular members provided so as to face each other is turned upside down and fitted into the mounting groove into which the other annular member is fitted, the protrusion provided on the annular member. Since the part interferes with the edge of the mounting groove, erroneous mounting is surely prohibited.

The ring member mounting structure according to claim 3 is the ring member mounting structure according to claim 1 or 2, wherein the ring member is formed in the lower half of the ring member and is formed in the upper housing. It is characterized in that a rotation stop ridge is formed which is engaged with an edge portion of the fitting groove to be fitted and which inhibits rotation of the rotary shaft due to rotation.

As described above, since it is prohibited to mount the annular member by reversing the inside and outside, it is possible to surely make the function of the rotation by the rotation stopping ridge act, and the rotation causes the annular member to be eccentric. , The problem of contact with the rotating shaft is eliminated.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of an annular member mounting structure of the present invention will be described below with reference to the drawings. In addition, the same reference numerals are given to the same structural parts as those of the conventional technique, and the description thereof will be omitted. In FIG. 1, reference numeral 41 is a lower housing that constitutes the housing 3, and the lower housing 41 has a lower housing 41 as shown in FIGS. 2 and 3.
An engaging groove 42 is formed in a part of a side wall forming the housing portion 33 of the mounting groove 31 on one side. The engagement groove 42 is formed at the opening edge of the storage portion 33, and
1 is communicated with the upper surface side and further formed along the circumferential direction.

Further, on the lower half side of the oil drainers 21 and 22 which are annular members fitted into the mounting groove 31 having the housing portion 33 in which the engagement groove 42 is formed, the rotation stopping projection 24 is provided.
Is provided on the side surface in the vicinity of the end portion of the, and when the oil drainers 21 and 22 are fitted into the mounting groove 31,
The protrusion 43 is formed in the engagement groove 42 formed on the side wall of the storage portion 33.
Is to be inserted. The protrusion 43 is composed of a screw or the like screwed into a screw hole formed on the side surface of the rotation stopper protrusion 24 of the oil drainer 21, 22.

In the oil drainers 21 and 22, one of the connecting portions of the divided bodies by the pin 23 is arranged in the vicinity of the end portion of the rotation stopper ridge 24, and the other connecting portion is one of the connecting portions. It is provided on the opposite side of the location.

Next, the case of assembling the main oil pump in the above structure will be described. First, the lower split bodies 21b and 22b, which are fitted into the mounting groove 31 of the lower housing 41, are arranged in the mounting groove 31 while inserting the protrusion 43 into the engaging groove 42. . At this time, if the split bodies 21b and 22b are turned upside down and fitted into the other mounting groove 31, the split body 21b
Since the protrusions 43 provided on the b and 22b interfere with the opening edge of the storage portion 33, the fitting into the mounting groove 31 in this state is prevented.

When the lower split bodies 21b, 22b of the oil drainers 21, 22 are fitted into the mounting groove 31, the lower split bodies 21
The protrusions 43 of b and 22b are rotated so as to be pushed inward of the engagement groove 42 (see FIG. 4). By doing so, the lower divided bodies 21b and 22b and the upper divided bodies 21c and 22 are
The respective connection points with c are arranged near the upper surface of the lower housing 41.

In this state, the rotary shaft 5 is arranged, and the upper divided bodies 21c and 22c are butted against each other from above, and the lower divided bodies 21b and 22b and the upper divided body 21 are arranged.
c and 22c are connected by a pin 23 (see FIG. 5). In this way, when the lower divided bodies 21b, 22b and the upper divided bodies 21c, 22c are connected, the oil drainer 2
1 and 22 are slightly rotated so that the ends of the anti-rotation protrusions 24 are substantially flush with the upper surface of the lower housing 41.
Then, in this state, by mounting the upper housing 2 on the upper surface side of the lower housing 41, as shown in FIG. 3, the oil drainers 21 and 22 are placed in the regular positions and the main oil pump is placed. Is assembled.

As described above, the oil drainer 2 of the above-described embodiment is used.
According to the mounting structure of the annular members such as 1 and 22, the housing portion 33 of the mounting groove 31 on one side of the lower housing 41.
Is formed with an engaging groove 42 extending from the upper surface of the lower housing 41 in the circumferential direction, and is inserted into the engaging groove 42 when fitted into the mounting groove 31 on the lower half side of the oil drainers 21, 22. Since the protrusions 43 are provided, it is possible to prohibit the fitting of the oil drainers 21 and 22 into the mounting groove 31 in the state of being turned upside down. As a result, it is possible to surely eliminate a defect such as a defective seal due to an erroneous mounting in which the front and back are reversed.

In particular, one of a pair of oil cuts 21 and 22 provided to face each other is turned upside down and fitted into a mounting groove 31 into which the other oil cut 21 and oil cut 22 are fitted. Even in such a case, the protrusion 43 interferes with the edge of the mounting groove 31, so that the erroneous mounting can be surely prohibited. Further, since it is prohibited to mount the oil drainers 21 and 22 by reversing the inside and outside, it is possible to surely operate the function of the rotation by the rotation stop projection 24, and the oil drains 21 and 22 can be operated by the rotation. Problems such as eccentricity and contact with the rotating shaft 5 can be eliminated.

In the above example, the oil drainers 21 and 22 provided in the main oil pump were described as an example of the annular member. However, the annular member is not limited to the oil drainers 21 and 22, but may be, for example, a turbine. Needless to say, it can be applied to a seal ring or the like provided in the above.

[0024]

As described above, according to the mounting structure of the annular member of the present invention, the following effects can be obtained. According to the mounting structure of the annular member according to claim 1, an engagement groove communicating with the upper surface of the lower housing is formed in the mounting groove on one side of the lower housing, and the lower half of the annular member is connected to the mounting groove. Since the protrusion that is inserted into the engaging groove when fitted is provided, it is possible to prohibit fitting of the annular member into the mounting groove in the state of being turned upside down. As a result, for example, when applied to an annular member having a spiral sealing groove formed on the inner peripheral surface and having a fixed sealing direction, such as an oil drainer provided around the rotation axis of the main oil pump, It is possible to reliably eliminate defects such as inadequate seals due to erroneous mounting by reversing.

According to the annular member mounting structure of the second aspect, one of a pair of annular members provided so as to face each other is turned upside down and fitted into a mounting groove into which the other annular member is fitted. Even if it is attempted to do so, the protrusion provided on the annular member interferes with the edge of the mounting groove, so that erroneous mounting can be reliably prohibited.

According to the annular member mounting structure of the third aspect, since it is prohibited to mount the annular member by reversing the front and back, it is possible to surely make the rotation stop ridge function as a circulator. Therefore, it is possible to eliminate the problem that the annular member is eccentric due to the rotation and contacts with the rotating shaft.

[Brief description of drawings]

FIG. 1 is a plan view of a lower housing of a main oil pump illustrating a mounting structure of an annular member according to an embodiment of the present invention.

FIG. 2 is a perspective view of a part of an oil drainer fitted into a mounting groove for explaining a mounting structure of an annular member according to an embodiment of the present invention.

FIG. 3 is a schematic cross-sectional view of a housing of a main oil pump equipped with an oil drainer for explaining a mounting structure of an annular member according to an embodiment of the present invention.

FIG. 4 is a schematic cross-sectional view of a lower housing in which a lower split body is fitted in a mounting groove for explaining how to mount an oil drainer in the mounting groove in the mounting structure for the annular member according to the embodiment of the present invention. .

FIG. 5 is a schematic cross-sectional view of a lower housing in which an oil cutout is fitted into the mounting groove for explaining how to install the oil cutout in the mounting groove in the mounting structure for the annular member according to the embodiment of the present invention.

FIG. 6 is a cross-sectional view of a main oil pump illustrating the configuration and structure of the main oil pump.

FIG. 7 is a side view of the main oil pump illustrating the configuration and structure of the main oil pump.

FIG. 8 is a schematic cross-sectional view of a main oil pump illustrating a mounting structure of an oil drainer in the main oil pump.

FIG. 9 is a perspective view of an oil drainer for explaining a conventional example of the oil drainer mounted on the main oil pump.

FIG. 10 is a side view of an oil drainer for explaining a conventional example of the oil drainer mounted on the main oil pump.

FIG. 11 is a front view of an oil drainer for explaining a conventional example of the oil drainer mounted on the main oil pump.

FIG. 12 is a schematic cross-sectional view of a main oil pump for explaining a mounting state of an oil cutout in the main oil pump.

FIG. 13 is a schematic plan view of a lower housing of the main oil pump for explaining a mounting state of an oil drainer in the main oil pump.

FIG. 14 is a schematic cross-sectional view of a main oil pump for explaining a mounting state of an oil cutout in the main oil pump.

FIG. 15 is a schematic cross-sectional view of a main oil pump for explaining a mounting state of an oil cutout in the main oil pump.

[Explanation of symbols] 2 Upper housing 3 housing 5 rotation axes 21, 22 Oil drainer (annular member) 24 Rotation stop ridge 31, 32 mounting groove 41 Lower housing 42 engagement groove 43 Projection

Claims (3)

[Claims] 1. A ring-shaped member such as an oil drainer or a seal ring, which is provided in a plurality around the rotation shaft rotatably supported in a housing composed of a lower housing and an upper housing, in the housing. A mounting structure, wherein a mounting groove into which the lower half of the annular member can be fitted is formed in the lower housing, and the mounting groove is provided at one side of the lower housing with an upper surface of the lower housing. An engaging groove communicating with the side is formed, and the lower half of the annular member that is fitted into the mounting groove has the engaging groove when the front and back are fitted in the mounting groove in a predetermined direction. A mounting structure for an annular member, characterized in that a protrusion to be inserted is provided. 2. The mounting member formed in the lower housing, wherein the annular members have asymmetrical front and back sides and are provided in pairs around the rotation shaft so as to face each other, and the annular members are fitted to each other. The mounting structure for an annular member according to claim 1, wherein the pair of annular members facing each other are formed in a cross-sectional shape that can be fitted in predetermined directions on the front and back sides, respectively. 3. The annular member has a lower half thereof engaged with an edge portion of a mounting groove formed in the upper housing and into which the annular member is fitted, so that the annular member is provided with rotation. The mounting structure for an annular member according to claim 1 or 2, wherein a rotation stop ridge for preventing rotation is formed.