JP5487804B2 - Rotating machine - Google Patents

Description

  The present invention relates to a rotating machine including a dynamo, an alternator and other generators, and an electric motor such as a motor, and more particularly to a rotating machine having a bearing cooling function.

  2. Description of the Related Art Conventionally, in a rotating machine that uses oil in a bearing portion, in order to make the rotation of a rotating shaft smooth, one in which oil is circulated through a bearing is known (see, for example, Patent Document 1 and Patent Document 2). ).

  In the case of such a configuration, as illustrated in FIG. 5, the bearing lubricating oil circulated from the tank T through the suction oil circulation line 103 exists between the bearing 122 and the rotating shaft 121. In order to prevent leakage from the gap, a rotating machine having a configuration for sucking the oil lubricated to the bearing 122 by making the return-side flow path a negative pressure return line 142 connected to the oil suction pump P1. 101 is known.

  Specifically, as shown in the figure, the oil sucked up from the tank T by the pump P and circulated in the rotating machine main body 102 is not shown for cooling the rotating machine main body 102 itself such as the rotor R and the stator S. It branches into a pressure line 131 that goes to the internal circulation circuit and a bearing lubrication line 104 that goes to the bearing. Here, in the vicinity of the bearing 122, the air pressure in the vicinity of the rotating shaft 121 tends to be relatively lower on the outer side of the rotating machine body 102 due to an airflow generated outside the casing 120 due to the rotation of the rotating shaft 121. For this reason, the oil in the bearing lubrication line 104 leaks outward from the gap 120a between the inside and the outside of the casing 120. Therefore, in order to prevent such oil leakage, a negative pressure is generated in the return flow path 142 from the bearing 122 by disposing the oil suction pump P1 in the return flow path 142 to the tank T in the bearing lubrication line 104. Therefore, the oil is prevented from leaking out of the casing 120 from the bearing 122.

  In the illustrated example, the oil discharged from the internal circulation circuit is returned to the tank T through the pressure return line 132. In addition, oil is also supplied to the coil end CE, and the oil supplied to the coil end CE is returned to the tank T through the atmosphere release return line 133.

JP 2000-152553 A JP 2008-61468 A

  However, in the case of the rotating machine 101 adopting the mode shown in FIG. 5, the flow rate of the bearing lubricant is as small as, for example, several ml per minute. In order to generate a pressure difference until the oil is not leaked from the gap portion 120a serving as the boundary, it is necessary to suck in air having a capacity of several tens of thousands times the oil flow rate. In other words, the oil suction pump P1 originally intended to suck a liquid such as lubricating oil is forced to use an unfavorable method of mainly sucking air.

  Of course, the oil sucked into the oil suction pump P1 is returned to the tank T again. However, since most of the oil suction pump P1 returns air, a large amount of air is introduced into the tank T. In addition to increasing the size of the tank, there may be a problem that unnecessary bubbles, oil mist, etc. are generated.

  The present invention pays attention to such inconveniences, and provides a rotating machine having a structure capable of sucking bearing lubricating oil and preventing oil leakage without using an electric external device such as a pump. It is aimed.

  In order to achieve such an object, the present invention takes the following measures.

That rotary machine according to the present invention, the oil circulation line for circulating the oil from the tank, at least a portion is provided in the casing, rolling journaling the rotary shaft part of the oil in the oil circulation line and the bearing lubrication lines for lubricating and supplied to the bearing, negative pressure generating means for generating a bearing return negative pressure in the line from the rolling bearing by utilizing the flow of oil of the oil circulation line in the bearing lubrication lines And the starting end of the bearing return line through which the oil supplied to the rolling bearing is guided is located at a position axially outward of the rotating shaft in the gap between the rotating shaft and the casing. It is provided in .

  If this is the case, the rotating shaft is supported while effectively avoiding the use of an electrical external device such as a pump by utilizing the oil pressure for supplying and circulating the oil into the rotating machine. It is possible to forcibly suck out the bearing lubricant oil. In other words, the present invention uses the oil circulation line originally possessed by the rotating machine, thereby effectively avoiding the need to separately arrange the tank, thereby making the rotating machine itself and the tank more compact. In addition, the power consumption of the rotating machine and the maintenance work can be effectively reduced, and the generation of oil mist and the like can be effectively reduced.

  And as a structure for the negative pressure generating means to effectively generate the negative pressure, the oil circulation line has a pressure return line for returning the oil after cooling inside the casing to the tank, An embodiment in which the generating means is provided in the pressure return line can be mentioned.

Further, in order to effectively use the bearing lubricating oil, it is desirable that the end of the bearing return line is connected to the tank via the negative pressure generating means.

The other hand, if the oil circulation line is bearing lubricating open circuit for supplying oil from the casing outside the other bearing provided relative to the rolling bearing, the said negative pressure generating means It is preferable to effectively generate the negative pressure by providing the pressure supply line in the bearing lubrication open circuit.

In addition to more effectively prevent the leakage from the bearing lubricant rolling bearing to the outside of the casing, the said negative pressure generating means, which generates a negative pressure lower than the pressure of the rolling bearing near the outer casing It is preferable that

  As a specific mode for suitably realizing the negative pressure generating means, there can be mentioned one in which an aspirator is applied as the negative pressure generating means.

  According to the present invention, by utilizing the oil circulation line originally possessed by the rotating machine, it is possible to avoid arranging an electric external device such as a pump separately and to reduce the size of the rotating machine itself and the tank. It becomes possible to comprise. That is, by reducing the number of electrical external devices, it is possible to effectively reduce not only power consumption but also maintenance work required for the electrical external devices, which contributes to a reduction in oil mist.

The whole block diagram of the rotary machine which concerns on one Embodiment of this invention fractured | ruptured. The schematic diagram which shows the flow path of the line for oil circulation which concerns on the embodiment and the modification. The typical figure which shows the other modification which concerns on the flow path of the oil of the embodiment. The schematic diagram which shows the principal part which concerns on the other modification of the embodiment. The whole block diagram which fractured | ruptured partially showing the rotary machine which concerns on a prior art example.

  Hereinafter, an embodiment of the present invention and modifications thereof will be described with reference to FIGS. 1, 2, 3, and 4.

Rotating machine 1 according to this embodiment, the generator of such dynamo or alternator, or is intended to be used as an electric motor such as a motor for driving the fan, rolling rotatably journaling the rotary shaft 21 to the casing 20 It mainly includes a rotating machine body 2 having a bearing 22 and an oil circulation line 3 in which an oil pump P for circulating oil from a tank T is arranged in the rotating machine body 2.

In particular, the rotating machine 1 according to this embodiment, the bearing lubrication to be added to the oil circulation line 3, to supply oil to the rolling bearings 22 for rotatably supporting the rotary shaft 21 is branched from the oil circulation line 3 lubrication It includes the use line 4, by utilizing the flow of oil in the oil circulation line 3 and a bearing return aspirator 5 serving negative pressure generating means for generating a negative pressure in the line 42 from the bearing 22 rolling in a bearing lubrication line 4 It is characterized by that.

  Hereinafter, the oil circulation line 3 and the bearing lubrication line 4 in the configuration of the rotating machine 1 will be mainly described.

  The oil circulation line 3 is for cooling the inside of the casing 20, and includes a pressurized supply line 31 that supplies oil to the casing 20 and an oil supplied from the pressurized supply line 31 that circulates inside. An internal circulation circuit 30 (see FIG. 2) for cooling the rotating machine main body 2 itself such as the rotor R and the stator S and the oil circulated to cool the rotating machine main body 2 in the casing 20 are returned to the tank T. A pressure return line 32 for returning the oil, and an oil release return line 33 for returning the oil that has cooled the coil end CD and the like attached to the rotating machine body 2 to the tank through a path different from the pressure return line 32. And a distribution manifold 34 that distributes oil supplied from the pressurized supply line 31 to the internal circulation circuit 30, the bearing lubrication line 4, and the like.

Bearing lubrication line 4, at least a part thereof is intended to provided in the casing 20, the supply branched from the manifold 34, the rolling bearing supply line 41 for supplying oil to the bearing 22, the rolling bearing 22 A bearing return line 42 is connected to the aspirator 5 to guide the oil to the tank T. In the bearing return line 42, the starting end to which oil supplied to the rolling bearing 22 is guided is provided at a position outside the rolling bearing 22 in the axial direction of the rotating shaft 21 in the gap 20 a between the rotating shaft 21 and the casing 20. Yes.

Thus rotating machine 1 according to this embodiment, by attaching the aspirator 5 in a closed-pressure returning Ri line 32, the bearing back by generating a negative pressure in the line 42, suitably tank is supplied to the rolling bearing 22 oil It can be returned to T.

The aspirator 5 includes a pressure supply port 51 connected to the pressure return line 32, a discharge port 52 connected to the tank T, and a suction port 53 connected to the bearing return line 42. . And this aspirator 5, the negative pressure, near the bearing 22 rolling in particular capable of sucking the gas or liquid to the suction port 53 by the flow of oil, from organic pressure returning Ri line 32 to the outlet 52 flows from the pressure supply port 51 by generating the bearing return line 42 a lower pressure than the casing 20 outside the pressure bearing back encourage the flow of returning direction of the oil in the line 42, the oil leaks from the rolling bearing 22 to the casing 20 outside along the axial direction It has become a thing that can be effectively suppressed and the child.

  The operation of the rotating machine 1 according to this embodiment having such a configuration will be described below.

First, when the oil pump P is operated by the motor M to cool the rotating machine 1 in accordance with the operation of the rotating machine 1, the oil flowing into the pressurized supply line 31 through the distribution manifold 34 enters the internal circulation circuit 30. By circulating along the inside of the casing 20 and by circulating oil through the internal circulation circuit 30, the temperature rise of the rotating machine body 2 itself including the rotor R, the stator S, and the coil end CE is effectively suppressed. . At the same time, by guided to the bearing lubricating line 4 branched from the distribution manifold 34 oil meets the bearing 22 rolling by a bearing supply line 41, wear and temperature rise due to friction of the rolling bearing 22 can be effectively avoided .

Here, since the aspirator 5 is attached to the pressure return line 32 described above, a negative pressure is generated on the suction port 53 side by the flow of oil from the pressure supply port 51 to the discharge port 52 of the aspirator 5. It will be. That is, since the suction port 53 is connected to the bearing return line 42, negative pressure is similarly generated on the bearing return line 42 side. At that time, the bearing return line 42 becomes a negative pressure lower than the pressure in the vicinity of the rolling bearing 22 in the outside of the casing 20 in detail. Therefore, without oil supplied to the rolling bearing 22 to leak from the rotary shaft 21 and the gap 20a of the casing 20, a gap 20a of the casing 20 inside and the outside in other words, it is guided to the bearing return line 42. Thereafter, the oil guided to the bearing return line 42 is introduced from the suction port 53 into the aspirator 5 and returned from the discharge port 52 to the tank T.

As described above, the rotating machine 1 according to this embodiment, negative for generating negative pressure by utilizing the flow of oil in the oil circulation line 3 to the bearing return line 42 from the bearing 22 rolling in a bearing lubrication line 4 By providing the aspirator 5 as a pressure generating means, it is possible to rotate while effectively avoiding the use of separate electric power only by using the oil pressure for supplying and circulating oil into the rotating machine 1. the oil return side of the discharge oil supplied to the rolling bearing 22 supporting the shaft 21 can be forcibly sucked. In other words, the present invention uses the oil circulation line 3 that the rotating machine 1 originally has, thereby effectively avoiding the arrangement of the pump P1 as shown in FIG. The machine 1 and the tank T itself are more compactly configured, and the power consumption of the rotating machine 1 and further the maintenance work can be effectively reduced.

  In the present embodiment, the aspirator 5 is removed from the casing 20 as a configuration for quickly returning the oil from the bearing return line 42 sucked by the aspirator 5 while effectively generating the negative pressure in the aspirator 5 as the negative pressure generating means. Since the mode provided in the pressure return line 32 is applied, the oil on the way back to the tank T is effective for generating negative pressure without affecting the supply state of the oil for cooling the inside of the casing 20. Can be used.

Further, in the present embodiment in order to effectively utilizing the lubricated rolling bearing 22 oil, the bearing return line 42, to the same tank T and the tank T to the oil circulation line 3 through the aspirator 5 is connected Since they are connected, the oil and the tank T can be efficiently operated as a whole.

More specifically, in the present embodiment, since the set to generate a low negative pressure than pressure in the vicinity of the rolling bearing 22 of the outer casing 20 by the aspirator 5, rolling bearing rolling bearing 22 is an oil after lubricating The leakage from the casing 20 to the outside of the casing 20 can be more accurately prevented.

As mentioned above, although one Embodiment of this invention was described, this invention is not limited only to the structure of said embodiment. In other words, the configurations described in the modifications described below can be applied as appropriate. In addition, in each of the modified examples, the same reference numerals are given to the components corresponding to the same components as in the present embodiment, and the detailed description thereof is omitted.
<Modification 1>

In the present embodiment, as schematically shown in FIG. 2A, the internal circulation circuit 30 of the oil circulation line 3 is positioned around the rotary shaft 21 and the casing 20 at the position of the distribution manifold 34 as shown. Although the mode in which oil flows while separating toward both sides from the side is adopted, as schematically shown in FIG. 5 (b), the internal circulation circuit 30a is introduced and circulated without distributing oil from the side. It is good.
<Modification 2>

As further shown in FIG. 3, with structurally suppress leakage of oil by configuring the labyrinth portion 22a into the gap 20a or the like of the rotary shaft 21 and the casing 20, in the vicinity of the rolling bearing 22 in the casing outward rotation A shielding plate 22b for blocking back pressure from a rotating body such as a fan (not shown) provided on the front end side of the shaft 21 and airflow generated near the front end of the rotating shaft 21 may be provided.

In accordance with this arrangement, to avoid that the structurally addition to oil is configured to hardly leak, pressure rolling bearing 22 outside the influence of the rotating shaft 21 near the air flow from being excessively lowered, aspirator The negative pressure generated by 5 can be stably reduced below the external atmospheric pressure.
<Modification 3>

  And this invention can also be set as the aspect which distribute | arranged the aspirator to the open circuit other than the aspect which distributes the aspirator 5 to the pressure line in a closed circuit like the said embodiment.

That is, as shown in FIG. 4, the rotating machine 1 </ b> A according to this modification is a so-called double-axis type rotating electrical machine in which the rotating shafts 21 and 21 </ b> A are projected from both ends of the casing 20, and is applied to the rotating machine body 2. the oil circulation line according to the present invention, and a bearing lubricating open circuit 4A for supplying oil from the casing 20 outside the other bearing 22A provided relative to the rolling bearing 22.

Therefore, in this modification, the aspirator 5 serving as the negative pressure generating means is provided in the pressurized supply line 41A that supplies oil to the other bearing 22A. Then, the oil supplied to the other of the bearing 22A reaches the bearing 22 rolling after flowing along the casing 20 to the rotary shaft 21 is guided to the negative pressure returning Ri line 42 which connects to the suction port 53 of the aspirator 5. And in the case of this modification, the point which is not collect | recovered to the tank T like the said embodiment, and the oil which returned through the negative pressure return line 42 is again supplied to other bearing 22A is the said embodiment. Are different.

With such a configuration, since the aspirator 5 serving negative pressure generating means prior Yu pressure supply line 41A leading to the rotating machine main body 2 is able to become the arranged, with respect to the negative-pressure returning Ri line 42 from the rolling bearing 22, a greater since the structure capable of generating a negative pressure, becomes capable of further effectively suppressing the leakage of oil from the rolling bearing 22.

  As mentioned above, although embodiment and each modification of this invention were demonstrated, the specific structure of each part is not limited only to embodiment mentioned above, A various deformation | transformation is possible in the range which does not deviate from the meaning of this invention. It is.

  For example, in the above embodiment, the configuration in which the oil from the negative pressure return line is directly returned to the tank is disclosed as an example. However, since air actually flows through the negative pressure supply line, the air and oil are separated from each other. It is good also as a structure which returns only an oil to a tank after that through this means. In addition, the specific modes such as the specific circulation path of oil, the specific arrangement of the aspirator, and the scale of the rotating machine itself are not limited to those of the above-described embodiment, and the gist of the present invention. Various modifications can be made without departing from the scope.

T ... Tank 1 ... Rotating machine 3 ... Oil circulation line 4 ... Bearing lubrication line 4A ... Bearing lubrication open circuit 5 ... Negative pressure generating means (aspirator)
20 ... casing
20a ... gap 21 ... rotating shaft 22 ... rolling bearing 22A ... other bearing 32 ... perforated pressure returning Ri line 42 ... bearing return line 41A ... Yes pressure supply line

Claims (6)

An oil circulation line for circulating the oil from the tank;
At least partially disposed in the casing, and the bearing lubricating lines for lubricating and supplies to the rolling bearing for supporting the rotating shaft part of the oil in the oil circulation line,
; And a negative pressure generating means for generating a bearing return negative pressure in the line from the rolling bearing by utilizing the flow of oil of the oil circulation line in the bearing lubrication lines,
The starting end of the bearing return line through which the oil supplied to the rolling bearing is guided is provided at a position outside the rolling bearing in the axial direction in the gap between the rotating shaft and the casing. Features a rotating machine.   The said oil circulation line has a pressurized return line for returning the oil after cooling the inside of a casing to a tank, The said negative pressure generating means is provided in the said pressurized return line. Rotating machine. The rotating machine according to claim 1 or 2, wherein a terminal end of the bearing return line is connected to the tank to which the oil circulation line is connected via the negative pressure generating means. From the casing outside the other bearing the oil circulation line is provided relative to the rolling bearing is a bearing lubricating open circuit for supplying oil, the negative pressure generating means of the bearing lubricating open circuit The rotating machine according to claim 1, wherein the rotating machine is provided in a pressure supply line. The negative pressure generating means, the rotating machine of claim 1, 2, 3 or 4, wherein those which generate a negative pressure lower than the pressure of the rolling bearing near the outer casing. The rotating machine according to claim 1, 2, 3, 4, or 5, wherein the negative pressure generating means is an aspirator.

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