JPH0512683U - Rotating machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a rotary machine capable of reliably supplying lubricating oil to an oil passage formed in a rotating shaft even when the rotating shaft is installed in a horizontal posture. [Structure] An oil passage 31 for guiding a lubricating oil 17 to a main bearing 13 is formed in a horizontal rotary shaft 4 rotatably supported by a casing 1. An oil pump 34 is provided at an axially intermediate portion of the rotary shaft, and the oil pump sucks the lubricating oil into the oil passage from the inner lower portion of the casing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a device such as a scroll compressor (hereinafter, this device is referred to as a rotary machine) in which a rotating object is arranged inside a casing having an oil reservoir.

[0002]

[Prior Art]

 Conventionally, as an example of a rotary machine, a casing that separates the inside and the outside, a fixed scroll that is held by the casing, a movable scroll that cooperates with the fixed scroll to perform fluid compression, and a driving force are applied to the movable scroll. Scroll compressors that include a rotating shaft for transmission are known. An oil pool is formed inside the casing, and the lubricating oil used to lubricate each sliding portion is stored therein.

Some scroll compressors of this type are installed with their rotation axes in a vertical posture. In that case, lubricating oil is supplied to each sliding portion through an oil passage formed along the axis of the rotating shaft. To supply this lubricating oil, an oil pump is provided at the lower end of the rotary shaft. The oil pump serves to suck the lubricating oil into the oil passage according to the rotation of the rotating shaft and supply the lubricating oil to each sliding portion through the oil passage. (For example, refer to JP-A-63-36076)

[0004]

[Problems to be solved by the device]

 However, the oil supply structure described above is not suitable when the scroll compressor is installed so that the rotating shaft is in a horizontal posture. Specifically, there is a problem in supplying the lubricating oil to the oil passage formed on the rotating shaft.

Therefore, an object of the present invention is to provide a rotating machine that can reliably supply lubricating oil to an oil passage formed in a rotary shaft even when the rotary shaft is installed in a horizontal posture. To provide.

[0006]

[Means for Solving the Problems]

 According to the present invention, the casing having an oil reservoir for containing the lubricating oil for lubricating the sliding portion and the oil passage for guiding the lubricating oil to the sliding portion are provided, and the casing is rotatable. In a rotary machine including a rotating shaft supported by an oil pump and an oil pump for sucking the lubricating oil in the oil reservoir into the oil passage, the oil pump is provided in an axially intermediate portion of the rotating shaft. A rotating machine that does

[0007]

【Example】

 FIG. 1 shows a rotary machine according to an embodiment of the present invention. This rotary machine is, for example, a scroll compressor that is included in a refrigeration circuit and performs a compression action of a refrigerant gas. This scroll compressor includes a casing 1 that separates the inside and the outside, a fixed scroll 2 held by the casing 1, a movable scroll 3 that cooperates with the fixed scroll 2 to compress a fluid, and a movable scroll 3 that moves. It includes a rotating shaft 4 for transmitting a driving force to the scroll 3. The rotation of the rotary shaft 4 drives the movable scroll 3 in the same manner as in the above publication, and as a result, a predetermined fluid compression action is obtained. This point is a conventionally known technique and will not be described.

The casing 1 is composed of first, second and third casing parts 6, 7 and 8. The first casing part 6 is formed with a gas discharge hole 11 for discharging the compressed refrigerant gas. The second casing part 7 is integrally provided with a bearing support 12 inside. The bearing support 12 rotatably supports a part of the rotary shaft 4 via a main bearing 13. The third casing part 8 rotatably supports the other part of the rotating shaft 4 via the auxiliary bearing 14. The third casing part 8 is formed with a gas suction hole 16 for sucking the refrigerant gas to be compressed.

The oil sumps defined by the second and third casing parts 7 and 8 contain lubricating oil 17 for lubricating various sliding parts. In order to prevent the lubricating oil 17 from obstructing the movement of the balance weight 18 fixed to the rotary shaft 4, a cylindrical cover 19 as shown in FIG. 2 is provided so as to surround the rotary shaft 4. One end of the cylindrical cover 19 in the axial direction is closely fitted to a part of the bearing support 12, and the other end of the cylindrical direction is tightly fitted to a part of the third casing part 8. As a result, the inside and outside of the cover 19 are completely isolated. In this way, the cover 19 serves to remove the lubricating oil 17 so as to separate it from the rotating shaft 4 and the balance weight 18. The scroll compressor is arranged so that the rotary shaft 4 is substantially horizontal, and therefore, in the illustrated example, the lubricating oil is accumulated above the cover 19. If the amount of lubricating oil accumulated in the oil reservoir is small, a semi-cylindrical cover 19 'as shown in FIG. 3 may be used.

On the outside of the casing 1, an electromagnetic clutch device 20 for engaging and disengaging the rotational force with respect to the rotary shaft 4 is provided. Since this electromagnetic clutch device 20 is conventionally known, its description is omitted here.

Further, a ring plate-shaped leaf spring 21 as an elastic object is sandwiched between the first and second casing parts 6 and 7 via gaskets 22 and 23 as seal materials. In addition, the first and second casing parts 6 and 7, the leaf spring 21, and the gaskets 22 and 23 are fastened and fixed to each other by the plurality of bolts 24 screwed into the third casing part 8. There is. The leaf spring 21 extends inward of the casing 1. The flange portion 26 of the fixed scroll 2 is fixed to the inner portion of the leaf spring 21 by a plurality of bolts (not shown).

According to this, the fixed scroll 2 is held slightly movable in the axial direction. Therefore, by assembling the fixed scroll 2 against the movable scroll 3 in the axial direction, the fixed scroll 2 and the movable scroll 3 are separated from each other. The axial clearance of can be easily adjusted to a suitable value. Further, when the pressure of the compressed gas between the fixed scroll 2 and the movable scroll 3 excessively rises, the fixed scroll 2 slightly moves in the axial direction and automatically releases the compressed gas. There is no problem. The leaf spring 21 may be fixed to the first and second casing parts 7 and 8 by another fixing means such as welding.

The rotating shaft 4 is provided with an oil passage 31 extending along the center thereof and a plurality of oil supply holes 32 extending radially from the oil passage 31 and communicating with the main bearing 13. On the other hand, the bearing support 12 is formed with an oil suction hole 33 communicating with the inner lower portion of the casing 1. A trochoidal type oil pump 34 connected to the oil passage 31 and the oil suction hole 33 is provided at an axially intermediate portion of the rotary shaft 4. The oil pump 34 is arranged in a space formed by the bearing support 12 and the side plate 35 fixed to the bearing support 12.

Referring to FIG. 4, oil pump 34 includes an outer rotor 36 and an inner rotor 37. The outer rotor 36 is supported by the bearing support 12 so as to be rotatable around an axis that is eccentric with respect to the rotating shaft 4. The inner rotor 37 is fitted in the rotating shaft 4, is locked by a key 38, and rotates concentrically with the rotating shaft 4. The inner rotor 37 is arranged in a space inside the outer rotor 36. A space 39 is formed between the outer rotor 36 and the inner rotor 37 based on these unique shapes. When the rotary shaft 4 rotates in the direction of the arrow 41, the space 39 contracts in the upper part and increases in the lower part.

Referring to FIG. 5, the upper end 42 of the oil suction hole 33 is opened in a crescent shape extending along the outside of the main bearing 13 so as to face the lower portion of the void 39. Referring to FIGS. 6 and 7, the side plate 35 has a cutout portion 43. The cutout portion 43 faces the upper portion of the void 39. Returning to FIG. 1, the rotary shaft 4 has a plurality of oil introduction holes 44 extending in the radial direction and communicating the oil passage 31 with the cutout portion 43 of the side plate 35. Incidentally, 49 is a snap ring.

Now, when the rotary shaft 4 rotates in the direction indicated by the arrow 41 in FIG. 4, the void 39 contracts in the upper part and increases in the lower part, so that the flow of the lubricating oil as shown by the thick arrow in FIG. Occurs. That is, the lubricating oil 17 in the lower portion of the casing 1 is sucked into the oil suction hole 33, passes through the oil pump 34, the notch 43, and the oil introduction hole 44 and enters the oil passage 31, and further passes through the oil supply hole 32. It is supplied to the bearing 13. Therefore, the lubricating oil is reliably supplied to the main bearing 13 even though the rotating shaft is installed in a horizontal posture.

The lubricating oil in the oil passage 31 may be supplied to the sub bearing 14, or may be supplied to the drive bearing 46 provided in the movable scroll 3. Further, although the scroll compressor has been described above, it goes without saying that other types of rotary machines such as rolling piston type and reciprocating type compressors can be similarly implemented and have equivalent effects. Yes.

[0018]

[Effect of the device]

 As described above, according to the present invention, even when the rotary shaft is installed in a horizontal posture, the lubricating oil can be reliably supplied to the oil passage formed in the rotary shaft. Is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll compressor as a rotary machine according to an embodiment of the present invention.

FIG. 2 is a perspective view showing an example of a cover included in the scroll compressor of FIG.

FIG. 3 is a perspective view showing another example of a cover included in the scroll compressor of FIG.

4 is a cross-sectional view of only a main part taken along line IV-IV of FIG.

5 is a cross-sectional view of only a main part taken along line VV of FIG.

6 is a sectional view of only a main part taken along line VI-VI in FIG.

7A and 7B show an example of a side plate included in the scroll compressor of FIG. 1, in which FIG. 7A is a front view and FIG. 7B is a central sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 2 Fixed scroll 3 Movable scroll 4 Rotating shaft 6 1st casing part 7 2nd casing part 8 3rd casing part 12 Bearing support 13 Main bearing 17 Lubricating oil 19 Cover 19 'Cover 31 Oil passage 32 Oil supply Hole 33 Oil suction hole 34 Oil pump 35 Side plate 36 Outer rotor 37 Inner rotor 43 Notch 44 Oil introduction hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Norio Kitano, 20 Shouden-cho, Isesaki-shi, Gunma Sanden Co., Ltd.

Claims (3)

[Scope of utility model registration request] 1. A casing having an oil reservoir for accommodating a lubricating oil used to lubricate a sliding portion, and an oil passage for guiding the lubricating oil to the sliding portion, wherein the casing is rotatable. A rotary machine including a supported rotating shaft and an oil pump that sucks lubricating oil in the oil reservoir into the oil passage, wherein the oil pump is provided in an axially intermediate portion of the rotating shaft. machine. 2. The rotating machine according to claim 1, wherein the oil pump is a trochoid type pump. 3. The rotary machine according to claim 1, further comprising an oil suction hole, one end of which is connected to the oil pump and the other end of which is opened to an inner lower portion of the casing, and the rotary shaft extends substantially horizontally. .