JPH07119672A - Scroll type fluid machinery - Google Patents

Abstract

PURPOSE:To effectively cool a rotary scroll and a rotary bearing, and on the other hand, to realize reduction of size and reduction of cost. CONSTITUTION:A spiral body 7 is provided on the back side of a rotary scroll 6, and the spiral body 7 is blocked by a plate body to form a spiral space S between the rotary scroll 6 and the plate body 9, and a vent hole 11 comprising a central vent 11A, and an air passage 11B and a branch passage 11C is bored in the plate body 9. Cooling air is supplied into the spiral space S through a duct by a centrifugal fan 16 to cool the rotary scroll 6, and then the cooling air is sequentially circulated through the central vent 11A, the air passage 11B and the branch passage 11C of the vent hole 11 to cool a rotary bearing 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine suitable for use in, for example, an air compressor or a vacuum pump,
In particular, it relates to an oil-free scroll fluid machine.

[0002]

2. Description of the Related Art Generally, a casing, a drive shaft rotatably supported on one end side of the casing, and a drive shaft having a front end located inside the casing as a crank, and fixed to the other end side of the casing, A fixed scroll in which a spiral wrap portion is erected on the back surface, and a spiral wrap that is disposed in the casing so as to face the fixed scroll and that overlaps the fixed scroll wrap portion on the front surface of the end plate. And an orbiting scroll having a boss portion on the back surface, and an orbiting scroll which is provided between the boss portion of the orbiting scroll and the crank of the drive shaft and rotatably supports the orbiting scroll with respect to the crank. Scroll fluid machines consisting of bearings are known.

When this type of scroll fluid machine is used as an air compressor, the orbiting scroll is orbited by rotating the drive shaft from the outside by an electric motor or the like, and the orbiting scroll is rotated between the orbiting scroll and the fixed scroll. While compressing the air sucked from the outside in the plurality of compression chambers formed, this compressed air is discharged from the discharge port toward the external air tank or the like.

Here, in the conventional air compressor,
During the compression action, compression heat is generated in each compression chamber, and the wrap portion of the fixed scroll or the wrap portion of the orbiting scroll undergoes thermal expansion or strain deformation due to non-uniform temperature, and this heat of compression is transmitted to the orbiting bearing and However, there is a problem that the slewing bearing generates heat due to friction during rotation and grease or the like in the slewing bearing leaks to damage the slewing bearing. Then, in order to solve such a problem, what took the following means is known.

First, in the first prior art, Japanese Patent Laid-Open No. 59-59
As shown in Japanese Patent No. 34494, it is known that a heat insulating material or a heat insulating space is provided between the orbiting scroll and the orbiting bearing to prevent the heat of compression generated in the compression chamber from being conducted to the orbiting bearing.

Further, in the second conventional technique, the actual construction of Sho 63-
As shown in Japanese Patent No. 184, a cooling air passage is formed in a casing, and cooling air is generated by a multi-blade fan and a centrifugal fan to cool an orbiting scroll, an orbiting bearing, and the like.

[0007]

By the way, in the above-mentioned first prior art, since the heat insulating material is provided between the orbiting scroll and the orbiting bearing, it is possible to effectively transmit the compression heat to the orbiting bearing. It can be prevented. However, since this compression heat is conducted to the fixed scroll and the orbiting scroll, the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll are subject to thermal expansion and strain deformation, which interferes with the orbiting motion, resulting in durability and reliability. However, there is a problem in that

In the second conventional technique, cooling air is generated by the multi-blade fan and the centrifugal fan to cool the orbiting scroll, the orbiting bearing and the like. However, since the centrifugal fan is provided in the casing, the entire device becomes large and complicated, and a driving source having a large driving force is required to rotate both the multi-blade fan and the centrifugal fan. However, there is a problem that the manufacturing cost becomes high.

The present invention has been made in view of the above-mentioned problems of the prior art, and provides a scroll fluid machine capable of effectively cooling an orbiting scroll, an orbiting bearing, and at the same time downsizing and cost reduction. It is intended to be provided.

[0010]

In order to solve the above-mentioned problems, a scroll fluid machine according to the present invention includes a casing, a rotatably supported one end side of the casing, and a tip side located inside the casing of a crank. And a fixed scroll that is fixed to the other end of the casing and has a spiral wrap portion erected on the back surface of the end plate, and is disposed in the casing so as to face the fixed scroll. Between the orbiting scroll and the orbiting scroll provided on the front surface of the end plate with a vortex winding wrap portion overlapping the wrap portion of the fixed scroll, and the vortex winding body provided on the back side of the orbiting scroll. In order to form a spiral space, a ventilation hole that is fixed to the orbiting scroll in a state where the spiral body is closed and that allows cooling air to escape from the spiral space is provided at the center. In addition, a plate-shaped body having a boss portion on the back surface is provided between the boss portion of the plate-shaped body and the crank of the drive shaft, and the plate-shaped body and the orbiting scroll are rotated with respect to the crank. It is composed of a slewing bearing that is freely supported, and a slewing means that supplies cooling air from the spiral space through the ventilation hole to cool the slewing scroll and the slewing bearing.

[0011]

With the above structure, the orbiting scroll can be cooled from its rear surface by supplying the cooling air to the spiral space by the blowing means and blowing the cooling air toward the central portion in the spiral space. The slewing bearing can be effectively cooled by letting this cooling air escape from the central portion of the spiral winding space to the outside of the spiral winding space through the ventilation hole of the plate member.

[0012]

Embodiments of the present invention will be described below with reference to FIGS.

In the drawings, reference numeral 1 denotes a casing forming the outer shape of a scroll fluid machine, and the casing 1 is
Formed in a box shape from the top, bottom, left, right side plates and back plate,
A casing body 1A having an opening on the front side, a cylindrical bearing portion 1B protruding from one end side (rear end side) of the casing body 1A, and a casing body 1A integrally formed on the other end side (front end side). And a flange portion 1C. A duct 18 described below is connected to the right side plate of the casing body 1A, and a cooling air supply port 1D for allowing air to flow from the duct 18 into the casing body 1A is formed. The upper plate of 1A is provided with a cooling air exhaust port 1E for exhausting the air inside the casing body 1A to the outside.

Reference numeral 2 designates a bearing 3 in a bearing portion 1B of the casing 1.
4 shows a drive shaft that is rotatably supported via 4, and the tip end side of the drive shaft 2 extends into the casing body 1A of the casing 1 to form a crank 2A, and the axis of the crank 2A is the axis of the drive shaft 2. It is eccentric to the axis by a certain dimension.
The drive shaft 2 extends from one end side of the bearing portion 1B to the outside through a fan casing 15 described later, and a centrifugal fan 16 and a pulley (not shown) described later are provided on the base end side thereof. The drive shaft 2 is rotatably driven by an electric motor (neither is shown) via a belt on the pulley.

Reference numeral 5 denotes a fixed scroll fixed to the flange portion 1C of the casing 1 via bolts or the like (not shown). The fixed scroll 5 has a rectangular flat end plate 5A and the flange portion 1C. The mounting flange portion 5B formed so that the rear side outer edge of the end plate 5A is projected so as to correspond to the frame shape, and the rear end of the end plate 5A is erected upright, and the center side of the end plate 5A is the winding start end. , A spiral-shaped wrap portion 5C having an outer peripheral end as a winding end, and a large number of radiating fins 5 provided in parallel on the front surface of the end plate 5A.
., And a receiving surface 5E for slidingly contacting an end plate 6A of the orbiting scroll 6 which will be described later to receive a load in the thrust direction is formed on the outer side in the radial direction of the wrap portion 5C. .

A suction port 5F is formed on the upper side of the fixed scroll 5, and the suction port 5F communicates with the outermost peripheral compression chamber R1 which is the lowest pressure side among the compression chambers R described later. There is. A discharge port 5G is formed in the center of the end plate 5A of the fixed scroll 5, and the discharge port 5G communicates with the most central compression chamber R2 of the compression chambers R, which is the highest pressure side.

Reference numeral 6 denotes an orbiting scroll arranged in the casing body 1A of the casing 1 so as to face the fixed scroll 5, and the orbiting scroll 6 has a disk-shaped end plate 6A and the end plate 6A. The end plate 6A is erected on the front surface, and is generally constituted by a spiral wrap portion 6B in which the center side of the end plate 6A is the winding start end and the outer peripheral side is the winding end end.

Here, the wrap portion 6 of the orbiting scroll 6
B is arranged so as to overlap with the wrap portion 5C of the fixed scroll 5 by a predetermined angle and overlap with each other.
A plurality of compression chambers R, R, ... that are continuously reduced are formed between the wrap portion 5C of the fixed scroll 5 and the wrap portion 6B of the orbiting scroll 6 during the orbit. When the drive shaft 2 is rotated by the electric motor and the orbiting scroll 6 orbits together with the vortex body 7 described later, the suction port 5F is introduced into the compression chamber R1 on the outermost peripheral side, which is the lowest pressure side of each compression chamber R.
The outside air is sucked in through the compression chamber R
While sequentially compressing inside, it is sequentially fed into the high-pressure compression chamber R of each compression chamber R located on the central side, and is discharged from the highest-pressure side compression chamber R2 through the discharge port 5G to an external air tank or the like (not shown). ).

Reference numeral 7 denotes a spiral scroll provided on the back side of the orbiting scroll 6, and the spiral scroll 7 is integrally formed on the rear side of the end plate 6A of the orbiting scroll 6, as shown in FIG. The center side of the end plate 6A is a winding start end and the outer peripheral side is a winding end end. Then, one side of the spiral body 7 is closed by a plate-shaped body 9 described later, so that between the plate-shaped body 9 and the end plate 6A of the orbiting scroll 6, the spiral body 7 and the orbiting scroll are formed. A spiral plate-shaped space S is defined by the end plate 6A of 6 and the plate-shaped body 9.

.. are end plates 6A of the orbiting scroll 6.
A large number of cooling fins projecting from the back side into the spiral space S are shown, and each cooling fin 8 is a spiral winding of the heat generated in the orbiting scroll 6 by the compression of air in each compression chamber R. The heat is dissipated in the space S. That is, when the cooling air is blown into the spiral space S, the cooling air is blown on the respective cooling fins 8 to effectively cool the orbiting scroll 6. Further, the respective cooling fins 8 are provided so that the number thereof increases toward the center of the spiral space S. Thereby, the orbiting scroll 6 having the highest temperature in the central portion is cooled more effectively.

Reference numeral 9 denotes a plate-like body which is located on the rear side of the end plate 6A of the orbiting scroll 6 and is arranged so as to sandwich the vortex winding body 7 with the end plate 6A. The plate-like body 9 is the orbiting scroll. A disk portion 9A formed in a disk shape having substantially the same diameter as the end plate 6A of No. 6, and a swivel bearing 12 (described later) formed at the center of the back surface of the disk portion 9A so as to project toward one side in the axial direction. It is generally composed of a boss 9B to be housed. The plate-shaped member 9 is fixed to and integrated with the end plate 6A of the orbiting scroll 6 by a plurality of fixing members 10 such as bolts while closing one side of the spiral member 7 on the front surface side of the disk portion 9A.

Reference numeral 11 denotes a ventilation hole formed at the center of the disk portion 9A of the plate-like body 9 so as to allow the cooling air from the spiral space S to escape to the periphery of the boss portion 9B. A central ventilation hole 11A formed in the plate-like body 9 so as to communicate with the inner peripheral side of the boss 9B and a radial end of the plate-like body 9 in the radial direction as shown in FIG. , A plurality of ventilation passages 11B, 11B, ..., which extend through the central ventilation hole 11A to communicate the spiral space S with the ventilation space T in the casing body 1A, and the respective ventilation holes. Branch passages 11C, 11C, ... Branched from the middle of the passage 11B, extended in the axial direction to one side in the boss portion 9B, and formed so as to open to the ventilation space T at the tip end side of the boss portion 9B. ing.

As a result, the air (cooling air) flowing into the spiral space S through the duct 18 by the centrifugal fan 16 described later in the direction of arrow A in FIGS. 3 and 4 is the spiral space. It circulates in S in the direction of the arrow B in FIG. 4, and central ventilation hole 11A of ventilation hole 11, each ventilation passage 11B and each branch passage 1
1C flows in the direction of arrow C in FIG. 3 and flows out to the ventilation space T in the casing body 1A.

Reference numeral 12 denotes a slewing bearing inserted in the inner peripheral side of the boss portion 9B of the plate-like body 9. The crank 2A of the drive shaft 2 is inserted in the inner peripheral side of the slewing bearing 12, and the slewing bearing is attached. Reference numeral 12 supports the plate-shaped body 9 and the orbiting scroll 6 so as to be orbitable with respect to the crank 2A of the drive shaft 2.

Reference numeral 13 indicates an auxiliary crank (only one is shown in the drawing) which is located on the outer peripheral side of the orbiting scroll 6 and which is provided, for example, three in the circumferential direction. One side of each auxiliary crank 13 is a rear plate of the casing body 1A. Is rotatably supported via a bearing 13A, and the other side is rotatably supported by an end plate 6A of the orbiting scroll 6 via a bearing 13B. And
Each of the auxiliary cranks 13 prevents the orbiting scroll 6 from rotating within the casing body 1A. Reference numeral 14 indicates a counterweight fixed to the drive shaft 2, and the counterweight 14 balances the rotation of the drive shaft 2.

Reference numeral 15 denotes a fan casing attached to one end side of the bearing portion 1B of the casing 1. The fan casing is formed in a bottomed cylindrical shape, and the other side thereof is located on the outer peripheral side of the bearing portion 1B of the casing 1. Cooling air suction port 15A,
A plurality of 15A, ... Are provided in the circumferential direction. Further, a duct 18 described later is connected to a part of the outer peripheral side of the fan casing 15, and a cooling air blowing port (not shown) for blowing cooling air from the fan casing 15 to the duct 18 is formed. Has been done.

Reference numeral 16 denotes a centrifugal fan located inside the fan casing 15 and fixed to the outer peripheral side of the drive shaft 2 by a fixing member 17. The centrifugal fan 16 constitutes a blower means together with a duct 18 described later. There is. Then, the centrifugal fan 16 rotates together with the drive shaft 2, and the fan casing 1
External air is sucked into the fan casing 15 from the cooling air suction port 15A of No. 5, and this air is used as cooling air from the cooling air blowing port through the duct 18 described later to the casing body 1A.
It is intended to blow air toward.

Reference numeral 18 denotes a duct for guiding the air blown by the centrifugal fan 16 to the casing body 1A. One end side of the duct 18 is connected to the cooling air blowing port of the fan casing 15, and the other end side thereof is the casing body 1A. Is connected to the cooling air supply port 1D.

Here, the cooling air supply port 1D of the casing body 1A is bored so as to be located in the vicinity of the winding end end of the vortex winding body 7. As a result, when the centrifugal fan 16 rotates together with the drive shaft 2, the fan casing 15
The air (cooling air) that is sucked from the cooling air intake port 15A and is blown from the cooling air blowing port to the casing body 1A through the duct 18 is the cooling air supply port 1 of the casing body 1A.
From D, it flows into the spiral space S in the casing body 1A in the direction of arrow A in FIGS. 3 and 4.

The scroll fluid machine according to the present embodiment has the above-mentioned structure. When the drive shaft 2 is rotationally driven by the electric motor, this rotation is transmitted from the crank 2A to the orbiting scroll 6 via the orbiting bearing 12. .
At this time, the orbiting scroll 6 is prevented from rotating about its axis by the auxiliary crank 13, and makes an orbiting motion with a predetermined radius of gyration about the axis of the drive shaft 2. The compression chambers R, R, ... Defined between the wrap portions 5C, 6B are continuously contracted by this swiveling motion, and the external air sucked from the suction port 5F of the fixed scroll 5 is continuously reduced. The compressed air is sequentially compressed in the compression chamber R while the compressed scroll 5
From the discharge port 5G to an external air tank or the like.

Next, the operation of cooling the orbiting scroll 6, the orbiting bearing 12 and the like using the spiral space S and the ventilation hole 11 will be described.

That is, when the drive shaft 2 is rotationally driven by the electric motor, the orbiting scroll 6 orbits and starts the compression operation of air, and at the same time, the centrifugal fan 16 rotates. As a result, external air is sucked into the fan casing 15 from the cooling air intake port 15A of the fan casing 15, and this air is used as cooling air from the cooling air blowing port of the fan casing 15 via the duct 18 to the casing body 1
The air is blown toward the cooling air supply port 1D of A.

Then, this cooling air flows into the casing body 1
When it flows into A, it flows into the spiral space S in the direction of arrow A in FIGS. 3 and 4, and flows in the spiral space S in the direction of arrow B in FIG. 4 toward the center of the spiral. . At this time, the cooling air is blown onto each cooling fin 8 to remove heat conducted to each cooling fin 8, that is, compression heat generated by compression of air in each compression chamber R, from the orbiting scroll 6. The orbiting scroll 6 is cooled.

Further, while cooling the orbiting scroll 6,
The cooling air that has reached the center of the spiral space S flows into the central ventilation hole 11A of the ventilation holes 11 of the plate-like body 9 and the boss portion 9B.
Through the ventilation passages 11B and the branch passages 11C, and flow out into the ventilation space T in the casing body 1A. At this time, this cooling air removes the heat of the boss portion 9B, that is, the heat generated in the orbiting bearing 12 due to the rotation of the drive shaft or the like, and cools the orbiting bearing 12. The cooling air that has flowed into the ventilation space T is discharged to the outside via the cooling air exhaust port 1E of the casing body 1A.

Thus, in this embodiment, the spiral scroll 7 is provided on the back side of the orbiting scroll 6, and the spiral scroll 7 is closed by the plate-like body 9, whereby the orbiting scroll 6 and the plate-like body 9 are separated. A spiral-shaped space S is defined between them, and the plate-shaped body 9 has a central ventilation hole 11A, each ventilation passage 11B and a branch passage 1.
A ventilation hole 11 made of 1C is bored, cooling air is sent into the spiral space S through the duct 18 by the centrifugal fan 16, and the cooling air is circulated in the spiral space S. Each ventilation passage 11 from the central ventilation hole 11A to the boss portion 9B
B and each branch passage 11C are circulated.

As a result, when the cooling air flows in the spiral space S, the orbiting scroll 6 can be cooled from the back side via the respective cooling fins 8, and the wrap portion of the orbiting scroll 6 is compressed by the heat of compression. 6B and the like can be surely prevented from thermal expansion and strain deformation, and the orbiting scroll 6
It is possible to reliably prevent the compression heat conducted to the fixed scroll 5 from being transmitted to the fixed scroll 5 to cause thermal expansion or strain deformation in the wrap portion 5C and the like of the fixed scroll 5, and to greatly improve durability and reliability. You can

Further, when the cooling air flows through the ventilation passages 11B and the branch passages 11C of the ventilation hole 11, heat can be taken from the boss portion 9B and the orbiting bearing 12 can be cooled effectively. it can. As a result, the slewing bearing 12
It is possible to improve the life of the grease and the like enclosed in the bearing, and to reliably prevent the grease and the like in the slewing bearing 12 from leaking and being damaged, and to extend the life thereof.

Further, the ventilation hole 11 is provided from within the spiral space S.
By sequentially circulating the cooling air to the orbiting scroll 6 and the orbiting bearing 1 without providing a plurality of fans such as a centrifugal fan and a multi-blade fan as in the second conventional technique.
2 can be effectively cooled, and the scroll fluid machine can be prevented from becoming large and complicated.

Furthermore, since the spiral scroll 7 is erected on the back side of the orbiting scroll 6, the spiral scroll 7 serves as a rib of the orbiting scroll 6, and the strength of the orbiting scroll 6 can be improved. Yes, orbiting scroll 6
Can be effectively prevented from being deformed by the pressure of compressed air, compression heat, or the like. As a result, the end plate 6A of the orbiting scroll 6 can be made thinner than the current state, and the orbiting scroll 6
Manufacturing cost can be reduced.

In the above embodiment, the spiral scroll 7 is integrally provided upright on the back side of the orbiting scroll 6, and the spiral scroll 7 is
Although it has been described that one side is closed by the plate-like body 9, the present invention is not limited to this, and the plate-like body 2 as shown in FIG.
1, a thick disk portion 21A, a spiral body 21B integrally provided on the front surface of the disk portion 21A, and the disk portion 21.
The plate-like body 21 is generally composed of a boss portion 21C provided at the center on the back side of A, and the plate-like body 21 has a central ventilation hole 22A formed at the center of the disc portion 21A and a disc portion from inside the central ventilation hole 22A. The ventilation hole 22 may be formed by a plurality of ventilation passages 22B and 22B that are formed by obliquely extending toward the rear side of 21A.

Further, the present invention may be constructed such that the orbiting scroll, the spiral body and the plate-like body are integrally processed or integrally cast.

Further, although the scroll air compressor has been described as an example in the above embodiment, the present invention is not limited to this, and may be used for a scroll vacuum pump or the like.

[0043]

As described above in detail, according to the present invention, the spiral scroll is provided on the back side of the orbiting scroll, and the spiral scroll is closed by the plate-like body so that the space between the orbiting scroll and the plate-like body is closed. A spiral-shaped space is defined, and cooling air is supplied to the spiral-shaped space by blower means to cool the orbiting scroll from the back side, and the cooling air is supplied from the ventilation holes of the plate-shaped body to the spiral space. Since the orbiting bearing is cooled by letting it escape to the outside, the orbiting scroll and the orbiting bearing can be effectively cooled, and the wrap portion of the orbiting scroll is securely deformed by the compression heat generated when the air is compressed. It is possible to prevent damage to the slewing bearing due to compression heat, heat generated by rotation of the drive shaft, etc.
Durability and reliability can be greatly improved.

[Brief description of drawings]

FIG. 1 is an external view showing a scroll fluid machine according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged vertical cross-sectional view showing an orbiting scroll, a plate-shaped body and the like in FIG.

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

5 is a sectional view taken along the line VV in FIG.

FIG. 6 is a vertical cross-sectional view showing a modification of the plate-shaped body at the same position as in FIG.

[Explanation of symbols]

 1 Casing 1A Casing body 1B Bearing part 2 Drive shaft 2A Crank 5 Fixed scroll 5A End plate 5C Wrap part 6 Orbiting scroll 6A End plate 6B Wrap part 7 Whirlpool 9 Plate-like body 9A Disk part 9B Boss part 10 Fixing tool 11 Vent hole 11A Central ventilation hole 11B Ventilation passage 11C Branch passage 12 Slewing bearing 13 Auxiliary crank 16 Centrifugal fan (blowing means) 18 Duct S Whirlpool space

Claims (1)

[Claims] 1. A casing, a drive shaft rotatably supported on one end side of the casing, and a drive shaft having a tip side located inside the casing serving as a crank, and fixed to the other end side of the casing, and attached to the rear surface of the end plate. A fixed scroll in which a spiral wrap portion is erected, and a spiral scroll wrap portion that is disposed inside the casing so as to face the fixed scroll and that overlaps the fixed scroll wrap portion on the front surface of the end plate. In order to form a spiral space between the orbiting scroll and the orbiting scroll provided on the back side of the orbiting scroll and the orbiting scroll, the orbiting scroll is closed in the state where the orbiting scroll is closed. It is fixed to the scroll and has a vent hole at the center to let the cooling air from the spiral space escape.
A plate-shaped body having a boss portion on the back surface, and a boss portion of the plate-shaped body and a crank of the drive shaft, and the plate-shaped body and the orbiting scroll are rotatably supported by the crank. A scroll fluid machine comprising a revolving bearing, a revolving scroll, and a blower for supplying cooling air from the spiral space through the ventilation hole to cool the revolving scroll.