JP5863436B2 - Fluid machinery - Google Patents

Description

  The present invention relates to a fluid machine including a plurality of rotating mechanisms.

  A fluid machine in which two rotating mechanisms are housed in a housing is known. In this fluid machine, for example, a compressor is provided on one end side of an output shaft (hereinafter, simply referred to as a shaft) of a motor, and an expander is provided on the other end side. In this fluid machine, since the shaft needs to be extended from the compressor on one end side to the expander on the other end side, the shaft becomes longer than that of a fluid machine having one rotating mechanism. Therefore, as in Patent Document 1, there are cases where the shaft is divided into two parts and then connected to each other.

  As in Patent Document 1, an oil supply passage for supplying lubricating oil to a sliding portion inside a compressor or an expander or a shaft bearing may be formed in the shaft. The lubricating oil stored at the bottom of the housing is pumped up by a pump, and the lubricating oil is supplied to a necessary place through an oil supply passage. If the lubricating oil leaks from the connecting portion of the shaft, the amount of oil supply on the downstream side of the connecting portion is insufficient. Therefore, in Patent Document 1, two shafts are provided inside the bearing provided between the motor and the expander. By connecting these, the leakage of the lubricating oil from the connecting portion of the shaft is suppressed.

JP 2007-270818 A

As described above, the fluid machine including the two rotation mechanisms has a long shaft, and accordingly, the oil supply path also becomes long. For this reason, the closer to the end point of the oil supply path, the more easily the amount of oil supply becomes insufficient due to pressure loss. Therefore, it is not sufficient to suppress the leakage of the lubricating oil from the connecting portion as in Patent Document 1, and it is necessary to stably supply the oil further to the downstream side of the oil supply passage.
In addition, since the two shafts cannot always be connected inside the bearing, it is desirable to secure a means that can contribute to the stability of oil supply in addition to suppressing the leakage of the lubricating oil by covering the connecting portion with the bearing.

  An object of this invention is to provide the fluid machine which can perform oil supply stably through the oil supply path formed in the some shaft connected based on said subject.

The fluid machine of the present invention includes a motor that outputs a rotational driving force, a first rotating mechanism that is driven by the output of the motor, a second rotating mechanism that is driven by the output of the motor, a first rotating mechanism, The output of the motor is transmitted to the second rotation mechanism, and an output shaft in which an oil path through which the lubricating oil passes is formed, and an oil storage portion in which the lubricating oil is stored.
The output shaft has a first output shaft and a second output shaft.
The first output shaft is formed with a first oil path through which lubricating oil is supplied from the oil reservoir. Further, the second output shaft is formed with a second oil path that communicates with the first oil path and is supplied with the lubricating oil through the first oil path.
The fluid machine of the present invention, than the first oil path toward the second oil path, the eccentricity from the axis of the output shaft is rather large, between the first oil path and the second oil path, the lubricant An oil sump that allows oil to pass through is formed, and the oil sump has an opening diameter that includes both the first oil passage and the second oil passage .

According to this invention, since the amount of eccentricity from the axis of the output shaft is larger in the second oil path than in the first oil path, when the output shaft rotates, the first oil path changes to the second oil path. The centrifugal pump effect generated in the flowing lubricating oil promotes the flow of the lubricating oil toward the second oil path. As a result, the decrease in flow rate due to pressure loss is compensated, so that lubrication can be performed stably without running out of lubricating oil even in the sliding portion that is lubricated through the second oil path.
In addition, the first oil path and the second output path formed on the first output shaft are formed compared to the case where the first oil path and the second oil path are formed eccentric to each other on a single output shaft. Since the second oil path may be processed in a straight line, the output shaft can be easily manufactured.

In the fluid machine of the present invention, the cross-sectional area of the first oil path can be made larger than that of the second oil path.
Lubricating oil is supplied to the required sliding part in the process of being supplied from the first oil path (upstream side) to the second oil path (downstream side). Therefore, the flow rate of the lubricating oil needs to be increased on the upstream side, but may be small on the downstream side. Therefore, by enlarging the cross-sectional area of the first oil path, it is possible to sufficiently secure a flow rate that combines the oil supply of the first oil path and the oil supply of the second oil path while suppressing pressure loss. . On the other hand, in the second oil path located on the downstream side, a small flow rate corresponding to the amount of oil supplied by itself is sufficient, so that pressure loss can be suppressed even if the cross-sectional area is small.

The fluid machine of the present invention, between the first oil path and a second oil path communicating with each other, the oil reservoir to pass the lubricating oil is formed from the first oil path to the second oil path.
Since the second oil path is eccentric with respect to the first oil path, if the flow path at the connecting portion becomes narrow, pressure loss occurs. Therefore, by providing an oil reservoir and avoiding pressure loss at the connecting portion, the lubricating oil can flow smoothly from the first oil path toward the second oil path.
The oil reservoir in the present invention is preferably cylindrically recessed from one end face of the first output shaft and the second output shaft, or from both end faces of the first output shaft and the second output shaft.

In the fluid machine of the present invention, the second oil path can be formed so that the amount of eccentricity from the axis gradually increases as the distance from the first oil path increases in the axial direction.
According to this invention, since the centrifugal pump effect is continuously obtained while the lubricating oil flows through the second oil path, it can contribute to the stabilization of the oil supply.

In the fluid machine of the present invention, it is also preferable to include a positive displacement pump that pumps the lubricating oil in the oil reservoir to the oil path.
According to the present invention, by providing the positive displacement pump, the oil supply is more stable than the case where the lubricating oil is pumped only by the centrifugal pump effect, and the oil can be reliably supplied by each sliding portion. As the positive displacement pump, for example, a gear pump, a vane pump, a screw pump, or the like can be employed.

  According to the fluid machine of the present invention, the amount of eccentricity from the shaft center of the output shaft is larger in the second oil path than in the first oil path, so that oil supply in the entire first oil path and second oil path is achieved. Is stabilized. In addition, according to the fluid machine of the present invention, the first oil path and the second oil path which are provided with the first output shaft and the second output shaft and are eccentric from each other are connected to the first output shaft and the second output shaft. Since the first oil path and the second oil path are formed on the integrated output shaft, the output shaft can be easily manufactured.

It is a longitudinal section of the fluid machine concerning a 1st embodiment of the present invention. It is a longitudinal cross-sectional view of the connection part of a 1st shaft and a 2nd shaft. It is a longitudinal cross-sectional view which shows 2nd Embodiment of this invention. It is a longitudinal cross-sectional view which shows 3rd Embodiment of this invention. It is a longitudinal cross-sectional view which shows 4th Embodiment of this invention. It is a longitudinal cross-sectional view which shows 5th Embodiment of this invention.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
In the following description, the same reference numerals are given to the same components as those already described, and the description thereof is omitted or simplified.
[First Embodiment]
As shown in FIG. 1, the fluid machine 10 includes a sealed housing 108, a rolling piston type compression mechanism 101 as a first rotating mechanism housed in the sealed housing 108, and a scroll type as a second rotating mechanism. A compression mechanism 102 and a motor 103 (electric motor) are provided.

The hermetic housing 108 is configured in a cylindrical shape extending along the vertical vertical direction, and a rolling piston type compression mechanism 101 is provided below the inside thereof, and a scroll type compression mechanism 102 is provided above. ing. Between these rolling piston type compression mechanism 101 and scroll type compression mechanism 102, a motor 103 for driving both compression mechanisms 101, 102 is provided.
Further, the bottom of the hermetic housing 108 is an oil storage portion 105 in which the lubricating oil 104 supplied to each portion of the compression mechanisms 101 and 102 and the bearing is stored.

  A first shaft 110 is provided between the motor 103 and the rolling piston type compression mechanism 101, and a second shaft 210 coaxial with the first shaft 110 is provided between the motor 103 and the scroll type compression mechanism 102. Is provided. The first shaft 110 and the second shaft 210 constitute a shaft 100 that connects the two compressors 101 and 102 and the motor 103. The shaft center of the shaft 100 is indicated by S in FIGS.

A first oil path 141 and a second oil path 142 through which the lubricating oil 104 flows are formed in the first shaft 110 and the second shaft 210, respectively, as schematically shown in FIG. The first oil passage 141 penetrates from one end of the first shaft 110 to the other end, and the second oil passage 142 penetrates from one end of the second shaft 210 to the other end. The first oil path 141 and the second oil path 142 constitute an oil supply path (oil path) 14 for supplying the lubricating oil 104 to each sliding portion of the fluid machine 10. In the present embodiment, the first oil path 141 and the second oil path 142 have the same opening diameter.
In addition, a rotary positive displacement pump using a rotational driving force output from the motor 103 as a power source is provided at a lower end portion 110b of the first shaft 110 where the first oil passage 141 is opened (see FIG. 17 is provided). The suction port 17 is immersed in the lubricating oil 104 in the oil reservoir 105.

The sliding part which is the oil supply object by the oil supply path 14 says the part which mutually slides among the members which demonstrate a structure below. The sliding portion includes the inside of the bearing (the portion that slides with the outer peripheral surface of the first shaft 110 or the second shaft 210).
More specific contents of the oil supply passage 14 will be described after explaining the configuration of the two compression mechanisms 101 and 102 and the multistage compression process (low-stage compression and high-stage compression) by these compression mechanisms 101 and 102.

  The motor 103 is press-fitted and supported by the inner wall of the hermetic housing 108, and is disposed inside the stator 103a. And a rotor 103b. The rotor 103b and the first and second shafts 110 and 210 are provided coaxially.

  The first shaft 110 and the second shaft 210 are connected via the rotor 103b by being press-fitted into the shaft hole 103c of the rotor 103b. A portion where the first shaft 110 and the second shaft 210 are connected may be referred to as a connecting portion 24.

  As shown in FIG. 2, a convex portion 35 is formed on the upper end portion 110 a of the first shaft 110, while a concave portion 36 in which the convex portion 35 is fitted is formed on the lower end portion 210 b of the second shaft 210. Yes. The shape of the convex portion 35 and the concave portion 36 in a plan view is, for example, rectangular, so that the relative rotation of the two shafts 110 and 210 is restricted.

The scroll-type compression mechanism 102 includes a fixed scroll 111 and a turning scroll 116 that is positioned below the fixed scroll 111 and revolves around the axis of the fixed scroll 111.
The fixed scroll 111 is erected on the end plate 112 so as to surround the wrap 113, and is fixed to the inner wall of the hermetic housing 108. A peripheral wall 114 fixed to the frame 120 by bolts 111b or the like is provided.
The orbiting scroll 116 includes an end plate 117 and a spiral wrap 118 standing on the end plate 117. A cylindrical boss 119 projects from the center of the back surface (lower surface) of the end plate 117. Further, the rear surface of the end plate 117 is slidably supported by a horizontal receiving surface 121 of the frame 120.
Both scrolls 111 and 116 are assembled so that the wraps 113 and 118 are engaged with each other. Between the wraps 113 and 118, a plurality of crescent-shaped sealed spaces SA surrounded by end plates 112 and 117 are formed.

The frame 120 is formed with a through hole 120a into which the upper end side of the second shaft 210 is inserted. A bearing 122 is interposed between the inner wall of the through hole 120a and the outer peripheral surface of the second shaft 210, and the second shaft 210 is rotatably supported by the bearing 122.
An eccentric pin 123 that is eccentric from the axis of the second shaft 210 is fixed to the upper end surface 210t of the second shaft 210 that faces the end plate 117 of the orbiting scroll 116 from below. The eccentric pin 123 is slidably inserted into the boss portion 119 of the end plate 117. Further, the eccentric pin 123 is formed with a through hole 123 a that communicates with the second oil path 142 of the second shaft 210.
Further, between the peripheral wall 114 of the fixed scroll 111 and the end plate 117 of the orbiting scroll 116, an Oldham ring (not shown) that prevents the orbiting scroll 116 from rotating is interposed.

Next, the rolling piston type compression mechanism 101 includes a cylinder 130 and a main bearing body 131 and a sub bearing body 132 that sandwich the cylinder 130 from above and below. Inside the cylinder 130, a cylindrical cylinder chamber 133 is formed in which the upper and lower sides are surrounded by the main bearing body 131 and the auxiliary bearing body 132. In the cylinder chamber 133, a compressor rotor 134 and a blade (not shown) that partitions the cylinder chamber 133 into a suction port side and a discharge port side (not shown) are provided.
The inner circumferential surface of the compressor rotor 134 is fixed to an eccentric cam portion 135 provided on the outer circumferential surface of the first shaft 110.

When the fluid machine 10 is activated by exciting the motor 103, the rotational force of the motor 103 is transmitted to the rolling piston compression mechanism 101 by the first shaft 110 and also transmitted to the scroll compression mechanism 102 by the second shaft 210. The
At this time, in the rolling piston compression mechanism 101, the compressor rotor 134 rotates eccentrically in the cylinder chamber 133 with the eccentric rotation of the eccentric cam portion 135 due to the rotation of the first shaft 110. Thus, the working gas is sucked into the cylinder chamber 133 through the suction pipe 136 and the suction port (not shown) of the cylinder chamber 133 and is compressed in the cylinder chamber 133. Thereafter, the working gas is once discharged from the discharge port to the outside of the rolling piston compression mechanism 101 (inside the sealed housing 108).
By the compression step here, the working gas is compressed from a low pressure to an intermediate pressure (low-stage compression).

On the other hand, in the scroll compression mechanism 102, the orbiting scroll 116 orbits with respect to the fixed scroll 111 as the eccentric pin 123 rotates due to the rotation of the second shaft 210. Then, as the volume of the sealed space SA between the wraps 113 and 118 gradually decreases, the working gas in the sealed housing 108 is sucked into the sealed space SA through the passage 137 provided in the frame 120 and the peripheral wall 114. Compressed.
The compressed working gas is sequentially supplied to a discharge port 115 formed on the end plate 112, a check valve 128 for preventing backflow, a discharge cavity 127 formed on the end plate 112, and an upper wall of the hermetic housing 108. Then, the gas is discharged to the outside of the hermetic housing 108 through a discharge pipe 129 extending through the tube and extending to the outside.
By the compression step here, the working gas is compressed from an intermediate pressure to a high pressure (high-stage compression).

  Now, when the 1st shaft 110 and the 2nd shaft 210 rotate with starting of the fluid machine 10, the lubricating oil 104 in the oil storage part 105 will be in the oil supply path 14 by the positive displacement pump 17 from the lower end part 110b of the 1st shaft 110. The lubricating oil 104 is supplied to each sliding portion of the fluid machine 10 in the process of rising in the oil supply passage 14.

Hereinafter, the structure of the oil supply passage 14 in the first shaft 110 and the second shaft 210 will be described.
The first oil path 141 of the first shaft 110 is as shown in FIG. It is formed coaxially with the first shaft 110. The second oil path 142 of the second shaft 210 is formed along the axis (axis S) of the first shaft 110. However, the opening center of the second oil path 142 is eccentric from the axis S. The first oil path 141 and the second oil path 142 are in communication with each other at the connecting portion 24 between the first shaft 110 and the second shaft 210.
In addition to the first and second oil paths 141 and 142, the first and second shafts 110 and 210 have branch paths that branch from the first and second oil paths 141 and 142, respectively, although not shown. Have. Lubricating oil 104 is supplied from this path toward each sliding part.

When the first and second shafts 110 and 210 rotate in accordance with the rotation of the motor 103, the lubricating oil 104 in the oil reservoir 105 is removed from the first shaft 110 by the positive displacement pump and the centrifugal pump effect described later. The lubricating oil 104 is pumped up from the lower end portion 110 b to the first oil path 141, and rises along the first oil path 141. In the middle, oil is supplied to the inside of the cylinder 130, the main bearing body 131, and the auxiliary bearing body 132 through the branch path.
Furthermore, when the lubricating oil 104 flows into the second oil path 142 from the first oil path 141 through the connecting portion 24 of the first and second shafts 110 and 210, the receiving surface 121 of the frame 120 through the branch path, Oil is supplied to the bearing 122. Then, the lubricating oil 104 that has flowed into the through hole 123a of the eccentric pin 123 from the upper end of the second oil path 142 overflows from the upper end of the through hole 123a and is between the outer peripheral surface of the eccentric pin 123 and the inner peripheral surface of the boss portion 119. Is refueled.
Thereafter, the lubricating oil 104 dripped from each sliding part is stored in the oil storage part 105.

As described above, the lubricating oil 104 is supplied to each sliding portion of the fluid machine 10, but pressure loss occurs in the process in which the lubricating oil 104 rises in the first oil path 141 and the second oil path 142. This pressure loss increases as it goes up, that is, as it goes downstream in the oil path, so that the supply of the lubricating oil 104 to the upper sliding portion of the fluid machine 10 is hindered. Moreover, the pressure loss increases at the connecting portion 24. This is because the first oil path 141 and the second oil path 142 are eccentric from each other in the connecting portion 24, so that the opening diameter is reduced.
However, since the amount of eccentricity from the shaft center S is larger in the second oil path 142 than in the first oil path 141, the centrifugal force is larger at the lower end of the second oil path 142 than at the upper end of the first oil path 141. . The pressure difference in the vicinity of the shaft center S accompanying this causes a centrifugal pump effect in which the lubricating oil 104 is pumped from the first oil path 141 toward the second oil path 142, and thus the upward flow of the lubricating oil 104 is promoted. The Therefore, according to the fluid machine 10 of the present embodiment, the lubricating oil 104 is stably supplied to the sliding portion disposed above without being insufficient.
Here, even if the present embodiment is not provided with a positive displacement pump, the lubricating oil 104 in the oil reservoir 105 can be pumped up to the first oil path 141 due to the centrifugal pump effect. It is not essential to prepare. However, if the positive displacement pump 17 is provided, the ability to pump up the lubricating oil 104 increases, so that the oil supply is more stable without being affected by the viscosity of the lubricating oil 104 and the operating state (the number of rotations) of the fluid machine 10, Oil can be reliably supplied by each sliding part.

  In the present embodiment, the first oil path 141 is formed concentrically with the axis S of the shaft 100 and the amount of eccentricity from the axis S of the first oil path 141 is “0”. The present invention is not limited to this. Even if the first oil path 141 is eccentric from the axis S, the centrifugal pump effect can be obtained if the amount of eccentricity is smaller than the amount of eccentricity from the axis S of the second oil path 142. Accomplished.

Incidentally, the first and second oil paths 141 and 142 can be formed by preparing solid materials for the first and second shafts 110 and 210 and cutting them. In this case, the tool may be penetrated from one end of each of the first shaft material and the second shaft material toward the other end.
On the other hand, in the case of a single shaft (material) that is not divided, after cutting from one end to a predetermined depth to form the first oil path 141, cutting from the other end to a predetermined depth. Thus, the second oil path 142 is formed. In that case, in order to form the 2nd oil path 142 after forming the 1st oil path 141, in addition to changing the direction of the shaft material, it is necessary to adjust the cutting depth.
Therefore, according to the present embodiment in which the shaft 100 is divided into the first and second shafts 110 and 210, the first and second oil paths 141 and 142 are formed eccentrically with each other in a single shaft material. As compared with the above, the first and second oil paths 141 and 142 can be easily formed.

  In addition, as a processing method which forms the 1st, 2nd oil path | route 141,142, it is not restricted to cutting, Drawing or extrusion can be employ | adopted. Further, the first and second shafts 110 and 210 having the oil passages 141 and 142 can be manufactured by casting.

In the present embodiment, the first shaft 110 and the second shaft 210 are connected inside the rotor 103b, but this connection position is arbitrary. For example, the first shaft 110 and the second shaft 210 may be coupled within the bearing 122, the main bearing body 131, or the auxiliary bearing body 132. That is, the length distribution of the two shafts 110 and 210 constituting the shaft 100 can be arbitrarily changed.
Here, if the first shaft 110 and the second shaft 210 are connected at a position about ½ of the entire length of the shaft 100, the machining length per shaft can be kept short when drilling the oil path. Since it can be done (drill length can be shortened), it is easy to process, and the dimensional accuracy of the oil path is easy to achieve.

  Further, the means for restricting the relative rotation between the first shaft 110 and the second shaft 210 at the connecting portion 24 is not limited to the convex portion 35 and the concave portion 36, and any configuration can be adopted. For example, both can be connected via a sleeve fitted to the upper end portion 110 a of the first shaft 110 and the lower end portion 210 b of the second shaft 210. For example, the sleeve can be disposed inside the rotor 103b and can be integrally fixed to the rotor 103b.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG.
A cylindrical oil reservoir 28 is formed in the upper end portion 110a of the first shaft 110 and is recessed downward from the end face 110s.
The lower side of the oil reservoir 28 is continuous with the opening end of the first oil path 141, and the upper side thereof is opposed to the opening end of the second oil path 142. That is, the first oil path 141 and the second oil path 142 communicate with each other through the oil reservoir 28. The oil reservoir 28 has an opening having a size that includes the first oil path 141 and the second oil path 142 in the planar direction.

The oil reservoir 28 functions as follows.
(1) As described above, the oil reservoir 28 communicates with both the first and second oil paths 141 and 142 and has an opening size that includes both the first and second oil paths 141 and 142. Has a caliber. This oil reservoir 28 can eliminate pressure loss that occurs at the boundary between the first and second oil paths 141 and 142.
(2) When the first and second oil paths 141 and 142 are directly communicated without passing through the oil reservoir 28, the first and second oil paths 141 and 142 may be displaced due to the processing accuracy. If it does so, dispersion | variation will arise in the aperture diameter of the aperture_diaphragm | restriction of the boundary part of the 1st, 2nd oil path | route 141,142. However, if the oil reservoir 28 is interposed, this variation is eliminated, so that the lubricating oil 104 can be stably supplied from the first oil path 141 to the second oil path 142.
(3) If the amount of eccentricity of the second oil path 142 with respect to the first oil path 141 is increased, the two do not overlap in the planar direction, and therefore the first and second oil paths 141 and 142 cannot be directly communicated with each other. is there. However, by providing the oil reservoir 28, the lubricating oil 104 can be supplied from the first oil path 141 toward the second oil path 142 even in such a case.

Here, the opening diameter and further the depth of the oil reservoir 28 are set so that the above functions can be exhibited. For example, as an index, the opening diameter D at the connecting portion 24 is higher than that when the first and second oil paths 141 and 142 having the same opening diameter are arranged concentrically with each other. , 142 becomes smaller by the difference (D ₀ −D) from the opening diameter D ₀ and the flow rate passing therethrough decreases, so that the opening diameter and depth are set so as to compensate for this.
If the volume of the oil reservoir 28 is excessively increased, the amount of the lubricating oil 104 stored therein increases, and there is a possibility that the supply of the lubricating oil 104 downstream cannot be performed quickly. Therefore, it is desirable to take this into consideration when setting the size and shape of the oil reservoir 28. If set appropriately, the time required to fill with the lubricating oil 104 from the upstream side to the downstream side of the oil supply passage 14 including the oil reservoir 28 is shortened, so that oil supply to each sliding portion through the oil supply passage 14 is performed quickly. Accordingly, the compressor rotor 134, the rotor 103b, and the orbiting scroll 116 can be smoothly driven immediately after the compressor 10 is started.

  The oil reservoir 28 can be formed on the end surface 210s of the lower end portion 210b of the second shaft 210, or can be formed on both the end surface 110s of the first shaft 110 and the end surface 210s of the second shaft 210. . The oil reservoir 28 may be interposed between the first oil path 141 and the second oil path 142 regardless of the specific form.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG.
In the present embodiment, when the opening diameter D1 of the first oil path 141 and the opening diameter D2 of the second oil path 142 are compared, D1 is larger and D2 is smaller. In other words, the cross-sectional area of the first oil path 141 is larger and the cross-sectional area of the second oil path 142 is smaller.
The lubricating oil 104 is supplied to a necessary sliding portion in the process of flowing from upstream to downstream. Therefore, the flow rate of the lubricating oil 104 needs to be secured more on the upstream side, but may be smaller on the downstream side. The main point of the third embodiment is to determine the opening diameter D1 and the opening diameter D2 based on the difference in the supply amount of the lubricating oil 104 between the upstream and downstream.

By increasing the cross-sectional area of the first oil path 141, while suppressing the pressure loss of the lubricating oil 104 passing through the first oil path 141, the oil supply to the sliding portion that the first oil path 141 bears and the slide that the second oil path 142 bears A sufficient flow rate of the lubricating oil 104 required for supplying oil to the moving part is ensured.
On the other hand, in the second oil path 142 following the first oil path 141, the flow rate is sufficient to supply oil to the sliding portion carried by the second oil path 142, so that the cross-sectional area corresponding to the flow rate is small. Since the flow rate is small, pressure loss can be suppressed even if the cross-sectional area is small. Further, when the cross-sectional area of the second oil path 142 is reduced, the flow velocity of the lubricating oil 104 flowing therethrough can be increased. For this reason, since the lubricating oil 104 is rapidly filled to the downstream of the oil supply path 14, the fluid machine 10 can be driven smoothly immediately after starting.
From the above, by making the cross-sectional area of the first oil path 141 relatively large and the cross-sectional area of the second oil path 142 relatively small, the pressure in both the first and second oil paths 143 and 142 is increased. The fluid machine 10 can be driven smoothly immediately after startup while ensuring a necessary flow rate while maintaining a balance with the loss.

[Fourth Embodiment]
Next, a fourth embodiment of the present invention will be described with reference to FIG.
The second shaft 230 of the present embodiment has a second oil path 144 that is eccentric from the axis S thereof. The amount of eccentricity from the axis S of the second oil path 144 gradually increases from the lower end 144b toward the upper end (not shown). That is, the second oil path 144 is inclined with respect to the vertical direction. The lower end 144b of the second oil path 144 coincides with the hole position of the first oil path 141, but the upper end (not shown) of the second oil path 144 is, for example, the second oil path of the first embodiment (FIG. 2). It is eccentric from the axis S with the same amount of eccentricity as 142.

Since the amount of eccentricity from the axis S of the second oil path 144 gradually increases from the lower side toward the upper side, the centrifugal pump effect is continuously obtained while the lubricating oil 104 flows through the second oil path 144.
Furthermore, in the present embodiment, the positions of the first oil path 141 and the second oil path 144 having the same opening diameter in the connecting portion 24 coincide with each other, so that the opening diameter is constant before and after the connecting portion 24. Therefore, in the fourth embodiment, no pressure loss due to the restriction of the connecting portion 24 occurs, so that the stability of oil supply is superior to that of the first embodiment.

[Fifth Embodiment]
Next, a fifth embodiment of the present invention will be described with reference to FIG.
As shown in FIG. 6A, an annular shape is formed between the upper end portion 110a of the first shaft 110 and the lower end portion 210b of the second shaft 210 so as to surround the first oil passage 141 and the second oil passage 142. O-ring 31 is provided.
The O-ring 31 is held by an annular groove 110g formed on the tip surface of the upper end portion 110a (the top portion of the convex portion 35), and is compressed by its elasticity with the lower end portion 210b of the second shaft 210. It is provided in the state that was done.

Since the O-ring 31 seals the connection portion between the first oil passage 141 and the second oil passage 142 with respect to the outside, leakage of the lubricating oil 104 from the connection portion to the outside can be more reliably prevented.
Further, as shown in FIG. 6B, a metal gasket 32 can be provided in place of the O-ring 31. Even if it does in this way, the same effect is acquired.
The position where the O-ring 31 and the gasket 32 are provided is arbitrary as long as the O-ring 31 and the gasket 32 are provided. For example, the O-ring 31 and the gasket 32 are provided between the base portion 33 of the convex portion 35 and the side wall tip portion 34 of the concave portion 36 of the second shaft 210. You can also.

  In the above embodiment, the example in which two shafts are provided between the two rotation mechanisms and the motor has been described. However, the present invention allows the rotation mechanism and the shaft to be three or more. Of course, the number of rotating mechanisms may be different from the number of connected shafts.

  In addition to those described above, the configurations described in the above embodiments can be selected or modified as appropriate to other configurations without departing from the gist of the present invention.

DESCRIPTION OF SYMBOLS 10 Fluid machine 14 Oil supply path 24 Connection part 28 Recessed part 31 O-ring (seal member)
32 Gasket (seal member)
33 Base 34 Side wall tip 35 Projection 36 Concave 100 Shaft 101 Rolling piston compression mechanism (first rotation mechanism)
102 Scroll type compression mechanism (second rotation mechanism)
103 Motor 103a Stator 103b Rotor 104 Lubricating oil 105 Oil reservoir 108 Sealed housing 110 First shaft 110a Upper end 110b Lower end 110g Groove 110s End surface 111 Fixed scroll 111b Bolt 112 End plate 113 Lap 114 Circumferential wall 116 Orbiting scroll 117 End plate 118 Lap 119 Boss portion 120 Frame 120a Through hole 121 Receiving surface 122 Bearing 123 Eccentric pin 123a Through hole 127 Discharge cavity 128 Check valve 129 Discharge pipe 130 Cylinder 131 Main bearing body 132 Sub bearing body 133 Cylinder chamber 134 Compressor rotor 135 Eccentric cam section 136 Suction pipe 137 Passages 141, 143 First oil paths 142, 144 Second oil path 144b Lower end 210, 230 Second shaft 211 Outer peripheral surface 210b Lower end 210s End surface 2 0t upper surface S axis SA closed space

Claims (6)

A motor that outputs rotational driving force;
A first rotation mechanism driven by the output of the motor;
A second rotating mechanism driven by the output of the motor;
An output shaft that transmits the output of the motor to the first rotating mechanism and the second rotating mechanism, and in which an oil path through which lubricating oil passes is formed;
An oil storage part in which the lubricating oil is stored;
A fluid machine comprising:
The output shaft is
A first output shaft formed with a first oil path through which the lubricating oil is supplied from the oil reservoir;
A second output shaft that communicates with the first oil path and is formed with a second oil path to which the lubricating oil is supplied via the first oil path.
Towards the second oil path than the first oil path, the eccentricity from the axis of the output shaft is rather large,
An oil sump for allowing the lubricating oil to pass therethrough is formed between the first oil path and the second oil path,
The oil sump has an opening diameter large enough to include both the first oil path and the second oil path.
A fluid machine characterized by that. The first oil path has a larger cross-sectional area than the second oil path,
The fluid machine according to claim 1.   The oil sump is
  From one end surface of the first output shaft and the second output shaft, or from both end surfaces of the first output shaft and the second output shaft, is recessed in a cylindrical shape,
The fluid machine according to claim 1 or 2. As the second oil path is separated from the first oil path, the amount of eccentricity from the axis gradually increases.
The fluid machine according to any one of claims 1 to 3. A seal member is provided for sealing between the first output shaft and the second output shaft;
The fluid machine according to any one of claims 1 to 4. A positive displacement pump that pumps the lubricating oil in the oil reservoir into the oil path;
The fluid machine according to any one of claims 1 to 5.

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