JPS6329159B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to an oil draining device for a rotating machine, and particularly to a rotating machine that is housed in a casing and is suitable for draining oil from a rotating machine equipped with a forced lubrication type bearing. The present invention relates to an oil drainage device.

[Background of the invention]

The prior art of a rotating machine equipped with a forced lubrication type bearing will be described with reference to FIGS. 1 and 2.

Figure 1 is a cross-sectional view of a conventional oil drain device for rotating machinery.
FIG. 2 is a sectional view of a known improved oil draining device for the rotating machine shown in FIG. In FIG. 2, the same reference numerals as in FIG. 1 are the same parts as in the prior art prior to improvement.

In FIG. 1, 1 is the rotation axis of the rotating body,
This shows the high-speed rotating shaft of a rotating machine such as a reducer. 2 is a bearing that performs forced lubrication and supports the rotating shaft 1. Reference numeral 3 denotes a coupling which connects the rotating body 1 and a mating rotating body, such as a drive device. A casing 4 houses the rotating body 1, the bearing 2, etc., and has a main oil drain chamber 5 at the bottom of the casing near the bearing 2, to which a main oil drain pipe 7 is connected. A coupling cover 6 covers the coupling 3 and has an auxiliary oil drain chamber 6a at its bottom, to which an auxiliary oil drain pipe 8 is connected.
9 is a drain oil collecting pipe. The casing 4 and the coupling cover 6 are provided with an air vent 10.

The oil draining action of the oil draining device for a rotating machine having such a configuration and its problems will be explained.

Most of the lubricating oil squirted out from the gap between the rotating body 1 and the bearing 2 loses its squirt energy and flows into the main oil drain chamber 5.
The oil is then discharged to the outside through the main drain pipe 7 and the drain oil collecting pipe 9.

However, the remaining oil is absorbed by rotating body 1 and coupling 3.
These oils adhere to the coupling hub end face 3.
A and the projections of the flange portion 3b apply centrifugal force, and the oil is scattered into the main oil drain chamber 5 and the coupling cover 6. If the internal space of the main oil drain chamber 5 or the coupling cover 6 is narrow and a sufficient area cannot be secured, in the conventional structure, the scattered oil becomes mist-like oil smoke and is released to the outside from the air vent 10 along with the air. , contaminating the outside area of the machine. Furthermore, if the space between the outer diameter of the flange portion 3b of the coupling ring 3 and the inner wall of the coupling cover 6 is narrow, oil splashed inside the coupling cover 6 may pass through the auxiliary oil drain chamber 6a and the auxiliary oil drain pipe 8. While being discharged, the oil gets caught on the flange 3b of the coupling ring 3, causing the oil to be stirred and splashing again, resulting in an abnormal rise in the temperature of the drained oil.

Next, an improved example of the above-mentioned prior art has been implemented and will be described with reference to FIG.

In addition to the configuration shown in Figure 1, this improved technology also includes bearing 2
Splashing of drain oil from the main oil drain chamber 5 to the auxiliary oil drain chamber 6
An oil draining member is provided to prevent the oil from spreading to a.

Reference numeral 11 indicates an oil cutting plate provided near the exhaust oil spouting portion of the bearing 2, and 12 indicates an oil cutting plate provided close to the outer diameter portion 3c of the coupling hub of the coupling 3.

This oil drain plate 11 is for draining the drained oil to fall into the main oil drain chamber 5 before it reaches the coupling hub end face 3a, and the oil drain plate 12 is for the outer diameter part of the flange portion 3b of the coupling hub 3. This is to prevent waste oil from scattering due to centrifugal force. Both are used alone or in combination.

According to this configuration, it is thought that there is less oil scattering and less oil smoke is generated than the conventional configuration shown in FIG. 1, but there are still problems as follows.

That is, since the oil cutting plate 11 and the rotating body 1 are installed with a certain gap maintained, the waste oil that leaks through the gap through the rotating body 1 into the coupling hub end face 3a and the coupling hub outer diameter portion 3c is prevented. It is impossible to eliminate them all. Therefore, rotating body 1
Rotational energy is generated in the air and oil around the coupling 3 due to the rotation of the coupling 3, and the given energy gradually increases in size due to the air bypass created by the communication between the main oil drain pipe 7 and the auxiliary oil drain pipe 8, and This will cause an abnormal temperature rise inside the ring cover 6 and release of oil smoke to the outside.

Therefore, the oil cutting plates 11 and 12 alone cannot solve the problems of the conventional structure, and eventually the same problems as the conventional technique shown in FIG. 1 will occur.

[Purpose of the invention]

The present invention was made in order to solve the problems of the prior art described above, and is housed in a casing,
An oil drain device for rotating machines that improves the oil drainage of rotating machines equipped with bearings that perform forced lubrication, prevents oil smoke from being released to the outside from the air vent of the casing or coupling cover, and prevents abnormal rises in the temperature of the drained oil. Its purpose is to provide.

[Summary of the invention]

The present invention relates to an oil draining device for a rotating machine.The first aspect of the present invention relates to a rotating body supported by a bearing that performs forced lubrication, a coupling coupling the rotating body and a mating rotating body, and a casing that accommodates a body and is provided with a main oil drain chamber near the bearing and a main oil drain pipe connected thereto; and a coupling ring that covers the coupling ring and includes an auxiliary oil drain chamber and an auxiliary oil drain pipe connected thereto. An oil draining device for a rotating machine comprising a cover and an oil draining member that suppresses scattering of drained oil from the bearing between the main oil drain chamber and the auxiliary oil drain chamber. Either one of the oil drain pipes is a U-shaped drain pipe.

Moreover, the second oil draining device for a rotating machine according to the present invention
The structure of the invention includes a rotating body supported by a bearing that performs forced lubrication, a coupling coupling the rotating body and a mating rotating body, and housing the bearing and the rotating body, and a main oil drain near the bearing. a casing including a chamber and a main oil drain pipe connected thereto; a coupling cover that covers the coupling ring and includes an auxiliary oil drain chamber and an auxiliary oil drain pipe connected thereto; An oil draining device for a rotating machine comprising an oil draining member suppressing between a main oil draining chamber and the auxiliary oil draining chamber, wherein the oil draining member is an oil cutting member having an uneven portion, and the coupling of the coupling A concave portion for draining oil is provided on the end face of the hub, and an uneven portion of the oil draining member for scooping oil is located at a position close to the concave portion.

The ideas that led to the development of the present invention are as follows.

Drained oil adhering to the surface of the rotating body is centrifuged at the end face and flange of the coupling hub, forming cysts and scattering into the oil draining chamber. It is impossible to completely eliminate these scattered cysts. If the space in the main oil drain chamber and coupling cover is narrow, these mist will be further stirred in the space, and by mixing with air, it will be given more rotational energy than air alone, and due to its own weight. Instead of falling naturally, it turns into oily smoke along with the air and is released from the air vent to the outside.

Therefore, in order to prevent oil smoke from being released to the outside and to prevent an increase in internal temperature, it is a good idea to block the flow of air between the main oil drain chamber and the auxiliary oil drain chamber.
The energy imparted to the surrounding area by the rotation of the rotating body and the coupling is relatively small when the surrounding area is only air, but when the surrounding area contains oil, the energy increases as the comparison increases. Therefore,
If the amount of oil is reduced, the energy given to the surrounding area will not increase so much, so it is effective to install an oil cutting member to reduce the amount of oil as much as possible. However, the energy given to the air containing some amount of oil gradually increases in size due to air circulation through communication between the main oil drain pipe and the auxiliary oil drain pipe, causing an abnormal temperature rise inside the oil drain chamber and the release of oil smoke to the outside. Leads to.

The first invention of the present invention is based on this idea,
In addition to installing an oil cutter, we focused on the conventional structure in which the main oil drain pipe and the auxiliary oil drain pipe are connected via the oil drain collection pipe, creating a bypass air flow. This is intended to block the air flow in the oil drain pipe.

Moreover, in order to improve oil drainage and prevent oil from adhering to the coupling hub, the end face and outer diameter of the coupling hub are tapered, and the outer diameter of the coupling hub is tapered. An oil cutting member having a surface parallel to the oil cutting member is provided to effectively drain oil without impairing the conventional function and prevent oil scattering and generation of oil smoke.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.

FIG. 3 is a sectional view of an oil draining device for a rotating machine according to an embodiment of the present invention. In the figure, the first and second
Components with the same reference numerals as those in the drawings are the same parts as in the prior art, so their explanation will be omitted.

In Fig. 3, 20 is an auxiliary oil drain pipe connected to the auxiliary oil drain chamber 6a, and a U-shaped seal 2 related to the U-shaped piping.
0a. The U-shaped seal 20a
is filled with some oil in the initial state of use.

With this configuration, the oil discharged from the auxiliary oil drain pipe 20 gradually accumulates up to the height H of the U-shaped seal portion 20a, but when the amount of drained oil exceeds H, the drain oil is collected by that amount. It is discharged into pipe 9. As a result, the auxiliary oil drain pipe 20 is always connected to the U-shaped seal portion 20.
It has a water head corresponding to the height H of a, and the air flow communicating with the main oil drain pipe 7 can be eliminated.

Therefore, although the drain oil mist centrifuged from the surface of the rotating body 1 is scattered inside the main oil drain chamber 5 and the coupling cover 6, rotational energy does not increase due to the oil drain pipe communication. , the abnormal temperature rise and the release of oil smoke to the outside are eliminated, a part of the scattered oil loses energy and falls naturally, and the remaining mist is also transmitted to the inner wall of the main oil drain chamber 5, the coupling cover 6, and the main oil drain pipe 7. The oil is discharged to the auxiliary oil drain pipe 20.

As described above, according to this embodiment, it is possible to prevent oil smoke from being discharged to the outside without interfering with the functions of the oil drain chamber and oil drain pipe. It becomes possible to prevent temperature rise.

In this embodiment, the auxiliary oil drain pipe is a U-shaped pipe, but the invention is not limited to this, and either the main oil drain pipe or the auxiliary oil drain pipe may be a U-shaped pipe.

Next, another embodiment of the present invention will be described with reference to FIG.

FIG. 4 is an enlarged sectional view of an oil draining device for a rotating machine according to another embodiment of the present invention. In the figure, the same reference numerals as in FIG. 1 are the same parts as those in the prior art, so the explanation thereof will be omitted.

In FIG. 4, reference numeral 22 denotes an oil draining member, which is installed between the casing 4 and the coupling cover 6. 23 is a coupling that connects the rotating body 1 and the other rotating body. The coupling hub end face 23a of the coupling ring 23 is provided with a tapered oil draining recess 23d, and the coupling hub outer diameter portion 23c has a larger diameter on the coupling hub end face 23a side and decreases in diameter toward the flange 23d. It forms a taper in the direction of becoming smaller.

For this coupling 23, the oil cutting member 22
is equipped with uneven parts 22a and 22b for scooping oil,
In particular, the oil scooping concavo-convex portion 22b is formed so as to be located close to the concave portion 23d of the coupling ring. Further, the oil cutting member 22 is formed such that a tapered surface 22c parallel to the taper of the coupling hub outer diameter portion 23c covers the coupling hub outer diameter portion 23c while maintaining a slight gap 24. Reference numeral 22d denotes an oil drain hole, which is bored at a position close to the main oil drain chamber 5.

The oil draining action of the oil draining device for a rotating machine having such a configuration will be explained.

The drained oil ejected from the gap between the rotary body 1 and the bearing 2 flows through the oil drain part 23d of the coupling hub end face 23a.
Due to the centrifugal force of rotation, the particles are scattered along the tapered recess toward the opposite side of the coupling hub end surface 23a.
An oil draining member 22 is provided to prevent this scattered oil from adhering to the outer diameter portion 23c of the coupling hub, and an uneven portion 22a, 22 for scooping oil is provided.
b, etc., and falls into the main oil drain chamber 5. At this time, the uneven portions 22a and 22b for oil scooping allow the oil transmitted through the surfaces to reach the gap 22 on the outer periphery of the coupling hub.
This prevents direct infiltration.

Furthermore, even if some oil enters the gap 24, the rotational centrifugal force causes the oil to flow from the large diameter side, that is, from the coupling hub end face 23a side to the casing 4 along the taper of the coupling hub outer diameter portion 23c.
The outer diameter portion 23c of the coupling hub is pushed back inward.
It is possible to generally prevent oil from adhering to the surface.

Furthermore, the coupling 23 is not pushed back into the casing 4 from the coupling hub outer diameter portion 23c.
Even if there is oil falling to the side, the oil falls into the main oil drain chamber 5 from the oil drain hole 22d located at a position near the main oil drain chamber 5 at the bottom of the oil draining member 22.

As a result, even if the space inside the main oil drain chamber 5, auxiliary oil drain chamber 6a, coupling cover 6, etc. is narrow and a sufficient area cannot be secured, the mist will not be stirred, and oil smoke will be released from the air vent 10 to the outside. It is also possible to prevent the temperature of the drained oil from rising abnormally due to stirring of the mist.

Note that, as described above, the gap 24 is closed by utilizing the centrifugal force of the tapered portion 23c on the outer diameter of the coupling hub.
The oil that has passed through is made to flow backward and pushed back to the casing 4 side. The energy given by the centrifugal force is transferred to the outer diameter portion 23c of the coupling hub by the flange portion 23.
Since the diameter is smaller than that of the flange portion 23b and the surface thereof is smooth, the energy given by the flange portion 23b is much smaller than that of the flange portion 23b.

Therefore, the oil pushed back through the gap 24 will not accumulate energy in the casing 4 and will not cause a rise in temperature.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to improve oil drainage of a rotating machine equipped with a bearing housed in a casing and subjected to forced lubrication, and to release oil smoke to the outside from the air vent of the casing or coupling cover. It is possible to provide an oil draining device for a rotating machine that prevents abnormal rise in temperature of drained oil.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a conventional oil draining device for a rotating machine, FIG. 2 is a sectional view of a known oil draining device for a rotating machine shown in FIG. 1, and FIG. FIG. 4 is an enlarged sectional view of an oil draining device for a rotating machine according to another embodiment of the present invention. 1... Rotating body, 2... Bearing, 3... Coupling, 4... Casing, 5... Main oil drain chamber, 6...
Coupling cover, 6a... Auxiliary oil drain chamber, 7...
Main oil drain pipe, 8... Auxiliary oil drain pipe, 9... Oil drain collecting pipe, 10... Air vent, 11, 12... Oil cutting plate,
20...Auxiliary oil drain pipe, 20a...U-shaped seal, 2
2... Oil draining member, 22a, 22b... uneven portion for scooping oil, 22c... tapered surface, 22d...
Oil drain hole, 23...Cup ring, 23a...
...Coupling hub end face, 23b...Flange portion, 23c...Coupling hub outer diameter portion (tapered portion), 23d...Draining recess.

Claims (1)

[Claims] 1. A rotating body supported by a bearing that performs forced lubrication;
a coupling ring that connects the rotating body and the other rotating body; a casing that houses the bearing and the rotating body; and a casing that includes a main oil drain chamber near the bearing and a main oil drain pipe that connects thereto; and a casing that covers the coupling ring. , a coupling cover including an auxiliary oil drain chamber and an auxiliary oil drain pipe connected thereto, and an oil cutting member that suppresses scattering of drain oil from the bearing between the main oil drain pipe and the auxiliary oil drain chamber. , in an oil draining device for a rotating machine comprising a drain oil collecting pipe that communicates the main oil drain pipe and the auxiliary oil drain pipe, a U-shaped seal is provided in the middle of either the main oil drain pipe or the auxiliary oil drain pipe. An oil draining device for a rotating machine characterized by the following: 2 A rotating body supported by a bearing that performs forced lubrication,
a coupling ring that connects the rotating body and a mating rotating body; a casing that houses the bearing and the rotating body and includes a main oil drain chamber near the bearing and a main oil drain pipe that connects thereto; and a casing that covers the coupling ring. , a coupling cover including an auxiliary oil drain chamber and an auxiliary oil drain pipe connected thereto, and an oil draining member that suppresses scattering of drain oil from the bearing between the main oil drain chamber and the auxiliary oil drain chamber. In an oil draining device for a rotating machine, the oil draining member is an oil draining member having unevenness for scooping oil, and a recess for oil draining is provided on an end surface of the coupling hub of the coupling ring, and
An oil draining device for a rotating machine, characterized in that an oil-scooping uneven portion of the oil draining member is located in a position close to the recessed portion. 3 In what is stated in claim 2,
An oil drain device for rotating machinery, which has a taper with a larger diameter on the end face side of the coupling hub on the outer diameter of the coupling hub of the coupling ring. 4 In what is stated in claim 3,
An oil draining device for a rotating machine, which is provided with an oil draining member having a tapered surface parallel to the taper so as to cover the taper of the outer diameter part of the coupling hub with a small gap. 5. An oil draining device for a rotating machine according to any one of claims 2 to 4, wherein an oil draining hole is provided in a portion of the oil draining member near the main oil draining chamber.