JP2726484B2 - Bearing lubrication system for horizontal shaft rotating machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a bearing lubrication device for a horizontal rotating machine.

[Conventional technology]

Conventionally, lubrication methods for horizontal shaft rotating machines and the like are of the oil ring type, which lubricates the bearing using the rotation of the main shaft, the scraping method using an oil disk, or the self-lubricating type, such as a viscous pump, and an external hydraulic pump. And a system in which a lubricating oil is forcibly supplied by installing a cooling device or a cooling device. However, the oil ring and oil disk systems have a small amount of lubrication and are unstable, so their application range is narrowly limited. On the other hand, in the forced lubrication system, equipment costs such as a hydraulic device are required, and maintenance such as troubles in a pump and an electric system is required. Therefore, from the viewpoints of energy saving and maintenance-free, a proposal of a stable and reliable self-lubrication system from low speed to high speed is desired.

As a lubrication system using a viscous pump capable of increasing the amount of lubrication from such a background, as disclosed in Japanese Patent Application Laid-Open No. 62-41492, a bearing for supporting a rotating spindle, lubricating oil is provided under the bearing. A bearing housing to be stored, a disk integrally formed with the main shaft, and a loosely fitted mount on the outer peripheral portion thereof, and an oil suction groove portion provided from the lower portion to the upper portion symmetrically with one half of the inner peripheral surface or left and right, Oil is supplied by a pump mechanism comprising an oil suction section at the lower end and an oil ring having an oil discharge section at the upper end. That is, when the rotating disk is started, the lubricating oil in contact with the disk induces a pumping action by viscous frictional action of the oil, and is sequentially sucked up from the lower suction pipe. The oil that has flowed through the oil suction groove in the inner peripheral portion of the oil ring is boosted in pressure at the terminal end thereof, and is supplied to the bearing portion communicating from the oil discharge portion to perform lubrication and cooling.

Japanese Patent Application Laid-Open No. 62-72995 discloses that the above-mentioned viscous pump device is disposed substantially in the atmosphere, so that it is parallel to both sides of an oil suction groove formed in the center of an oil ring and in a circumferential direction. The auxiliary groove is machined to a length almost the same as that described above, and an oil suction portion is provided only at the lower end thereof.The oil introduced into the auxiliary grooves on both sides by the rotation of the disk has no oil discharge portion. A high pressure distribution is formed from the oil suction groove portion. Accordingly, the structure of the pump improves the performance of the pump by preventing air from entering from the side of the pump and preventing the oil suction groove from leaking sideways.

Further, Japanese Patent Application Laid-Open No. Sho 62-151658 discloses that by installing side covers on both end surfaces of an oil ring of a viscous pump configured in the same manner as described above, a portion of a rotating disk portion immersed in lubricating oil is increased, It is disclosed that a stable pump function can be obtained at the time of restart even if the oil level is slightly lowered by the operation described above, and that a disk agitation loss preventing structure by raising the oil level is disclosed.

[Problems to be solved by the invention]

Conventional viscous pumps have an annular oil ring (hereinafter
Only one half of the pump case)
The other has a structure without a pump function.

As a result, the main shaft starts rotating and a pump internal pressure is generated on the pump side, a pressure distribution is formed in the oil suction groove, and most of the pressurized oil flows out of the oil discharge portion, but adheres to the surface of the rotating disk. The drained oil flows through the gap with the pump case and flows to the side opposite to the pump. This oil is small and the pressure distribution on the opposite side of the pump is equal to nothing. Therefore, a force due to the pressure distribution difference acts on the pump side of the pump case, so that the gap on the side opposite to the pump side is reduced. Furthermore, the torque of the viscous friction of the oil acts on the pump case due to the rotation of the disk. However, since the detent device is located at the top of the pump, its vector is determined by the combined force of the pump's own weight and the friction torque. And the pump case is pulled toward the pump.

As described above, in the conventional structure, the force due to the oil film pressure and the viscous friction torque acts on the pump case, and the force concentrates on the pump side. It could lead to a pump case burnout accident. Therefore, it is not advisable to arrange the detent on the upper part of the pump case.

In addition, hydropower equipment may stop several times in a year, especially when restarting at low temperatures in winter, because the viscosity of the lubricating oil increases, so the viscous friction torque also increases and the pump case is abnormal. Will be subjected to a large force.

Thus, the prior art does not consider the dynamic action between the rotating disk and the pump case,
In addition to the contact between the pump case and the disk, there was concern that an abnormal rise in the lubricating oil temperature, the incorporation of wear powder, and the failure of the pump could lead to a bearing burnout accident.

The present invention has been made in view of the above points, and exhibits an effective pump performance from a low temperature start to a high speed range regardless of the surrounding environment, and supplies lubricating oil to the bearing during rotation to improve reliability. It is an object of the present invention to provide a bearing oil supply device for a horizontal shaft rotating machine.

[Means for solving the problem]

The object is to provide a pump device, projecting lands respectively provided on the upper and lower sides of an inner peripheral surface of a pump case, oil chambers respectively provided between the left and right pump cases and the disk of the upper and lower lands, An oil discharge section provided in a pump case at one upper end of the oil chamber and communicating with a bearing; an oil suction section provided in a pump case at one lower end of the oil chamber and opened to lubricating oil;
This is achieved by having the pump case detent means provided below the pump case and securing an oil chamber.

[Action]

Since the above means is provided, the pump performance corresponding to the viscosity change of the lubricating oil can be obtained, the oil chamber is secured, the lubricating oil is smoothly supplied to the bearing, and the reliability is improved. A possible bearing lubrication device is obtained.

That is, the lubricating oil introduced into the oil chamber of the pump case from the oil suction portion disposed below the oil level by viscous pump action is dammed by the land provided on the upper side of the oil chamber, and the pressure increases. Most of the pressurized lubricating oil flows out of the oil discharge portion to the outside and is supplied to the bearing. Further, the lubricating oil adhering to the surface layer of the rotating disk flows out to the oil chamber on the side opposite to the pump through a gap provided with the land provided on the upper side. The amount of the oil is small, but is not interrupted, and the lubricating oil is filled and circulated in the oil chamber.

On the other hand, when starting in a low temperature state, the viscosity of the lubricating oil increases, and the viscous friction torque also increases.However, the friction torque acting on the pump case acts on the opposite side of the pump because the rotation preventing means is arranged at the lower part of the pump case. I do. Accordingly, since the oil film pressure due to the pump internal pressure and the force due to the viscous friction torque act on the pump case in opposite directions, the imbalance of the forces is reduced.

As described above, the lubricating oil fills and circulates in the oil chamber, so that not only is the imbalance in force reduced, but also the eccentricity of the pump case is prevented by the oil film pressure generated on the land, and the lubricating oil is supplied to the bearing. A room is secured.

〔Example〕

Hereinafter, the present invention will be described based on the illustrated embodiments.
1 to 7 show an embodiment of the present invention. The bearing lubricating device of the horizontal shaft rotating machine is supported by a bearing frame 3 provided in a bearing housing 2 for storing the lubricating oil 1, and is provided on a sliding bearing 5 supporting a horizontal shaft type rotary main shaft 4, and on a rotary main shaft 4. A rotatable disk 6 which is concentric with the main shaft 4 and whose end is immersed in the lubricating oil 1 in the bearing housing 2, and an annular pump case 7 which is loosely mounted on the outer peripheral side of the disk 6. Lubricating oil 1 with a pump device having
(See FIG. 1). In the present embodiment, the pump device is replaced with a pump case 7 in the bearing lubrication device configured as described above.
Projecting lands 8 respectively provided on the upper and lower sides of the inner peripheral surface of the inner peripheral surface of the oil tank 9, oil chambers 9 provided between the left and right pump cases 7 and the disk 6 of the upper and lower lands 8, and the oil chambers 9. The oil suction unit 11 is provided in the pump case 7 at one upper end of the oil chamber, the oil discharge unit 10 communicating with the bearing 5, and the pump case 7 at the lower end of one side of the oil chamber 9. , Pump case 7
Is provided below the pump case 7 to secure the oil chamber 9 (see FIG. 2). By doing so, the pump performance corresponding to the viscosity change of the lubricating oil 1 can be obtained, the oil chamber 9 is secured, and the lubricating oil 1 is smoothly supplied to the bearing 5, and the surrounding environment is improved. Regardless, it is possible to obtain a bearing lubricating device for a horizontal rotating machine that exhibits effective pump performance from a low temperature start up to a high speed range and supplies the lubricating oil 1 to the bearing 5 during rotation to improve reliability. it can.

That is, as shown in FIGS. 2 to 6, the lubrication mechanism for the bearing has a disk 6 formed integrally with the rotating main shaft disposed in the vicinity of the bearing, and is loosely fitted on the outer peripheral portion of the disk 6. It is composed of a pump case 7 to be bridged and side covers 12 having sealing functions provided on both end surfaces thereof. Further, on the inner circumferential surface of the pump case 7, projecting lands 8 are formed at symmetrical positions in the vertical and horizontal directions, respectively, and a recess between the lands 8 is used as an oil chamber 9, and a horizontal land 8a on the pump side is formed. An oil passage 13 is formed at the center of the oil passage 9 so as to communicate with the upper and lower oil chambers 9, and a step groove 14 is formed on the inlet side of the horizontal land 8b on the opposite side of the pump. Further, an oil suction part 11 is opened at the lower end of the oil chamber 9, and is connected to a suction pipe 11a which is always installed below the oil level. The leading end of the suction pipe 11a is loosely fitted in a through hole 16 drilled in the opposed oil guide 15a and is installed extending downward, so that the suction pipe 11a serves as a device for preventing the pump case 7 from rotating. An oil discharge section 10 is opened at the upper end of the oil chamber 9 and connected to a discharge pipe 10a (see FIGS. 2 to 5).

Side covers 12 are provided on both end surfaces of the pump case 7 as described above. A circumferential seal groove 17 is formed on the inner surface of the pump 6 opposite to the side surface of the disk 6, and a cutout is formed at a lower portion thereof. A groove 18 is provided to conduct to the lubricating oil 1 to facilitate oil suction (see FIG. 3).

In the bearing lubrication device in which the pump device is configured as described above,
When the rotating spindle is started and rotated, the disk 6 integrated with the spindle also rotates as shown in FIG. 2, but the lower part of the disk 6 is set below the oil level, Since the lubricating oil 1 adheres to the disk 6, the lubricating oil 1 flows in the direction of rotation of the disk 6 as indicated by the arrow in the figure, and the pump action is induced by the viscous friction action. Due to the pumping action, the lubricating oil 1 introduced into the oil chamber 9 of the pump case 7 from the suction pipe 11a installed below the oil level,
Via the oil passage groove 13 (see FIG. 4), the pressure is blocked by the stepped portion between the upper end portion of the oil chamber 9 and the land 8, and the pressure rises, and the oil film pressure shown in FIG. pressure distribution such as P ₁ is formed. The lubricating oil 1 pressurized in this way is supplied to the discharge pipe 10a.
And is supplied to a bearing part communicating with the bearing part via the

On the other hand, the lubricating oil 1 of the surface layer of the disk 6 flows the gap g ₁ between the top of the land 8 to the oil chamber 9 of the through connexion anti pump side.
Although this amount of oil is smaller than the amount flowing out of the discharge pipe 10a, it is not interrupted. An oil film is also formed in the seal groove 17 of the side cover 12 provided on both end surfaces of the pump case 7 by viscous action of the lubricating oil 1. However, since this oil curtain prevents air from being mixed, Oil chamber 9
The inside is filled with lubricating oil 1 and introduced into a step groove 14 as shown in FIG.
Oil film pressure P _3, as shown in Figure 6 is formed in 8b.

The reaction force of the sub connexion, the gap g ₂ of Yotsute F ₁ becomes a force in the oil film pressure P ₁ which occurs in the pump side acts counter pump side is low shrinkage, oil film pressure P ₃ in the horizontal lands 8b anti pump side Occurs, and the effect of the step groove 14 is exerted to balance the forces, so that the sliding portions do not come into contact with each other.

Incidentally although during startup in cold conditions increases also the viscous friction torque F ₂ to increase the viscosity of the lubricating oil 1, the viscous friction torque F ₂ acting on the pump casing 7 is a detent on the suction pipe 11a of the lower pump casing Since it has been set, it acts on the side opposite to the pump as shown by the arrow in FIG.

Thus, the pump case 7 has the oil film pressure P _{1 of the} pump.
Since the force F ₁ and the viscous friction torque F ₂ by acting each other in the opposite direction, imbalance force is reduced.

FIG. 7 shows the relationship between the oil temperature and the force acting in the horizontal direction of the pump case by taking the oil temperature on the horizontal axis and the force acting in the horizontal direction of the pump on the vertical axis. As apparent from the figure, the gap g ₁ of the pump-side because the viscous friction torque F ₂ increases in a low temperature region but (a see FIG. 6) is reduced,
Force due to the oil film pressure P ₁ of the pump side as the temperature increases
F ₁ is a tendency to increase. Normally, the lubricating oil temperature during the main engine operation is in the range of 50 to 70 ° C., so that during normal operation, the lubricating oil is eccentric toward the anti-pump side. The load can be sufficiently borne by the oil film on the horizontal land 8b on the pump side.

Further, low temperature sets the orifice to discharge tube 10a, even cowpea to increasing the oil film pressure P ₁ of the pump-side control the flow rate are possible control shaft eccentricity, improved viscous pump Q-H characteristics Can be achieved.

As described above, the present pump device is operated while the disk 6 is slidably held through the oil film pressure generated on the lands 8 (8a, 8b) of the pump case 7, so that good pump performance can be obtained. it can.

As described above, according to the present embodiment, efficient pump performance can be obtained from a low-temperature start up to a rated operation region by the plurality of land effects formed in the pump case and an appropriate detent. Accordingly, the oil guide 15b, the labyrinth seal 19, the inner wall 20, the heat sink 21, the oil discharge chamber 22, the oil suction chamber 23, the flow path 24, the relay tank 25, the inlet 26, the oil dam 27, etc., also shown in FIG. The cooled lubricating oil 1 can always be supplied to the bearing 5 from the provided bearing oil supply device, and the reliability of the bearing 5 can be improved.

FIG. 8 shows another embodiment of the present invention. In the present embodiment, the circumferential length of the horizontal land 8a on the pump side is increased. Even in this case, the same operation and effect as those described above can be obtained.

That is, when the pump case 7 is eccentric to the opposite side of the pump, the load surface pressure of the horizontal land 8a on the pump side needs to be reduced, and when the land area is increased, the land width a shown in FIG. expanded to above, oil passing groove width l ₁ is less shrinkage, spike pressure in the lower oil chamber 9, significantly inhibits the suction from the oil suction portion 11. For this reason, the oil passage groove width l ₁ is determined and limited by the relative ratio to the pump width l.
It is better to extend 8a in the circumferential direction in terms of pump performance.

FIG. 9 shows still another embodiment of the present invention.
In this embodiment, the pump case 7 is supported by three lands 8. The pump side and the lower lands are formed eccentrically to reduce pump loss, and the oil suction portion 11 and the lower lands 8 are connected to each other. Are separated to improve the suction performance. In this case, the same operation and effect as in the above case can be obtained.

FIG. 10 shows still another embodiment of the present invention.
In this embodiment, as in the embodiment of FIG. 8, the load surface pressure on the pump side is reduced, and a plurality of horizontal lands 8a on the pump side are formed. As a result, a centering effect can be expected even if the vector of the force acting on the horizontal land 8a is slightly shifted.

〔The invention's effect〕

As described above, the present invention exerts effective pump performance from a low temperature start to a high speed range regardless of the surrounding environment, and supplies lubricating oil to the bearing during rotation so that reliability can be improved. Regardless, it is possible to obtain a bearing lubricating device for a horizontal shaft rotating machine that exhibits effective pump performance from a low temperature start up to a high speed range, and supplies lubricating oil to the bearing during rotation to improve reliability.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view of one embodiment of a bearing oil supply device for a horizontal shaft rotating machine according to the present invention, FIG. 2 is a front sectional view of a pump device of the same embodiment, and FIG. FIG. 4 is a perspective view on the rotating side of the pump case of one embodiment, FIG. 5 is a perspective view of the anti-rotating side of the pump case of one embodiment, and FIG. 6 is one embodiment of the same. FIG. 7 is a characteristic diagram showing the relationship between the oil temperature and the force acting in the horizontal direction of the pump in the same embodiment, and FIGS. 8 to 10 show the present invention. It is a front sectional view of a pump device which shows a different example of a bearing oil supply device of a horizontal axis rotating machine, respectively. DESCRIPTION OF SYMBOLS 1 ... Lubricating oil, 2 ... Bearing housing, 3 ... Bearing frame, 4 ... Rotating spindle, 5 ... Slide bearing, 6 ... Disk, 7 ... Pump case, 8 ... Land, 8a ... Pump Horizontal land on the side of the pump, 8b ... Horizontal land on the opposite side of the pump, 9
... oil chamber, 10 ... oil discharge part, 11 ... oil suction part, 13 ... oil passage groove, 14 ... step groove.

Continuing from the front page (72) Inventor Tomoaki Inoue 502 Kandate-cho, Tsuchiura-shi, Ibaraki Machinery Research Laboratory, Hitachi, Ltd. (72) Inventor Yuji Yamamoto 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Inside the factory (72) Inventor Hiroto Imai 2-9-1, Aise-cho, Hitachi City, Ibaraki Prefecture Within Hitachi Service Engineering Co., Ltd. 198798 (JP, U)

Claims (8)

(57) [Claims] 1. A sliding bearing which is supported by a bearing frame provided in a bearing housing for storing lubricating oil and supports a horizontal-shaft rotary spindle, is provided on said rotary spindle, and said spindle is concentric with said rotary spindle. A rotatable disk whose end is immersed in lubricating oil in a bearing housing, and a horizontal shaft rotating machine that supplies lubricating oil by a pump device having an annular pump case loosely mounted on the outer peripheral side of the disk. In the bearing lubrication device of the above, the pump device is provided with projecting lands provided respectively on the upper and lower sides of the inner peripheral surface of the pump case, and between the left and right pump cases and the disk of the upper and lower lands. The oil chamber provided is provided in a pump case at an upper end on one side of the oil chamber, and is provided in an oil discharge portion communicating with the bearing, and a pump case at a lower end on one side of the oil chamber. Opened to Suction unit, wherein the detent means of the pump casing is constructed with a lower portion of the pump casing, the bearing lubrication system of horizontal axis rotating machine is characterized in that so as to ensure the oil chamber. 2. The lower part of the pump case, wherein the detent means of the pump case acts so that the oil film pressure generated by the pump function of the pump device and the force by viscous friction torque act in opposite directions to each other. The bearing lubricating device for a horizontal shaft rotating machine according to claim 1, wherein the bearing lubricating device is disposed in a bearing. 3. A pump and a pump-side horizontal land provided at predetermined positions on a horizontal upper and left side surface of an inner peripheral surface of the pump case, and an oil passage groove is provided at a central portion of the pump-side horizontal land. A step groove is provided on the inlet side of the horizontal land opposite to the pump side.
A bearing lubrication device for a horizontal shaft rotating machine according to any one of the preceding claims. 4. A bearing lubrication system for a horizontal shaft rotating machine according to claim 1, wherein the lands provided on the inner peripheral surface of said pump case are formed symmetrically in a vertical direction and a horizontal direction, respectively. . 5. A bearing lubricating device for a horizontal shaft rotating machine according to claim 1, wherein said oil discharging portion of said pump device is provided with a discharge throttle at an outlet end thereof. 6. An oil discharge portion of the pump device, wherein a control valve made of a bimetal or shape memory alloy is provided at an outlet end of the oil discharge portion so that a flow passage area changes according to a change in temperature of the lubricating oil. 2. The bearing lubrication device for a horizontal shaft rotating machine according to claim 1, wherein: 7. Horizontal lands on the pump side and the non-pump side provided at predetermined positions on the left and right sides of the inner peripheral surface of the pump case,
The bearing lubrication device for a horizontal shaft rotating machine according to claim 1, wherein the horizontal length of the horizontal land on the pump side is formed larger than that of the horizontal land on the opposite pump side. 8. A bearing lubrication system for a horizontal shaft rotating machine according to claim 1, wherein a plurality of horizontal lands on the pump side are formed.