JPH04342801A - Scroll type hydraulic machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor, and more particularly to a scroll type fluid machine in which a cooling fan is provided on the drive shaft.

0002

2. Description of the Related Art FIGS. 3 and 4 show an oil-free package type air compressor as an example of a conventional scroll fluid machine.

In the figure, reference numeral 1 indicates a soundproof case, and the soundproof case 1 includes a flat bottom plate portion 1A, and a plurality of air inlets 1B, 1B, . . . provided on one end side of the bottom plate portion 1A. A plurality of air outlet ports 1D, 1D... (only two are shown) are provided on one side panel 1C and the other end side of the bottom plate portion 1A.
The other side panel 1E in which is perforated, and each panel 1C, 1E
The top plate portion 1G is provided over the upper end side of the belt and includes a top plate portion 1G in which a belt insertion hole 1F is formed. Further, an electric motor 18, which will be described later, is fixed to the upper surface side of the top plate portion 1G.

Reference numeral 2 denotes a casing provided in the soundproof case 1, and the casing 2 includes a large-diameter cylindrical portion 2A in which an orbiting scroll 6, etc., which will be described later, is accommodated, and a length extending from the center of one end side of the large-diameter cylindrical portion 2A. The bearing part 2B has a small diameter and is formed to protrude in the axial direction by a dimension L. In addition, the large diameter cylindrical portion 2
As shown in FIG. 4, A has an inflow hole 2C that communicates with an exhaust port 14D of the air duct 14, which will be described later, and an outflow hole 2D that is provided opposite to the inflow hole 2C and communicates with the inside of the soundproof case 1.
is formed.

3 has a bearing 4 in the bearing portion 2B of the casing 2,
5, the distal end of the drive shaft 3 extends into the large diameter cylindrical portion 2A of the casing 2 to become a crank 3A, and the proximal end extends outside the casing 2. It protrudes and is connected to an electric motor 18 via a pulley 16, which will be described later. Moreover, each of the bearings 4 and 5 has a support span S
The drive shaft 3 is mounted within the bearing portion 2B of the casing 2 at a distance axially apart from the drive shaft 3, and supports both ends of the drive shaft 3 with this support span S.

Reference numeral 6 designates an orbiting scroll located within the large-diameter cylindrical portion 2A of the casing 2 and rotatably provided on the crank 3A of the drive shaft 3. The orbiting scroll 6 includes an end plate 6A formed in a disc shape. It consists of a spiral wrap part 6B that stands up from the head plate 6A with the center side serving as the winding start end and the outer peripheral side serving as the winding end end, and a boss part 6C provided at the center of the back side of the head plate 6A. A crank 3A of the drive shaft 3 is rotatably mounted within the boss portion 6C. Further, on the back side of the orbiting scroll 6, orbiting side heat dissipation fins 19, which will be described later, are provided.

Here, key grooves (not shown) are formed at predetermined intervals in the circumferential direction on the outer peripheral side of the rear surface of the end plate 6A,
An Oldham joint (not shown) as a rotation prevention mechanism is provided in each keyway. And the orbiting scroll 6
When the drive shaft 3 is rotationally driven, the crank 3A gives a circular motion with a predetermined turning radius, and the Oldham joint prevents rotation, so that the drive shaft 3 rotates (revolutions) around the axis of the drive shaft 3. It is designed to continue.

Reference numeral 7 designates a fixed scroll fixed to the end surface of the large-diameter cylindrical portion 2A of the casing 2 so as to cover the other end of the casing 2;
An end plate 7A disposed on the center side so that its center coincides with the axis of the drive shaft 3, and a spiral wrap portion 7B erected from the end plate 7A in the same manner as the wrap portion 6B of the orbiting scroll 6. , is formed to protrude from the outer peripheral side of the end plate 7A,
It is composed of a large-diameter cylindrical portion 2A of the casing 2 and a cylindrical portion 7C that abuts against each other. Furthermore, fixed side heat dissipation fins 20, which will be described later, are provided on the back side of the mirror plate 7A.

Here, the wrap portion 7B of the fixed scroll 7 is disposed opposite to the wrap portion 6B of the orbiting scroll 6 so as to overlap with each other by a predetermined angle. 6B to define a plurality of compression chambers 8, 8, . . . that continuously contract.

Reference numerals 9 and 10 indicate a suction port and a discharge port formed in the fixed scroll 7, respectively, and the suction port 9 is formed in the cylindrical portion 7C so as to communicate with the compression chamber 8 on the outermost peripheral side (low pressure side). The discharge port 10 is bored in the center of the end plate 7A so as to communicate with the compression chamber 8 on the most central side (high pressure side). Further, the suction port 9 is connected to a suction filter 12 outside the soundproof case 1 via a suction pipe 11, and the discharge port 10 is connected to an external air tank (not shown) via a discharge pipe 13.

Reference numeral 14 denotes an air duct provided inside the soundproof case 1, and the air duct 14 is, as shown in FIG.
A fan housing part 14A is formed to cover one end side of the bearing part 2B of the casing 2, and a centrifugal fan 15 (to be described later) is housed therein.The base end communicates with the fan housing part 14A, and the distal end side is connected to the large diameter of the casing 2. Cylindrical portion 2A, fixed scroll 7
It is composed of a discharge pipe 14B extending toward the side. Further, the fan housing portion 14A is formed with an intake port 14C that opens on the other end side (the large-diameter cylinder portion 2A side of the casing 2), and the distal end side of the exhaust pipe 14B is provided with a swirling-side radiation fin 19 for directing the cooling air. Two exhaust ports 14D, 14D are formed for distributing exhaust air to the fixed side heat dissipating fin 20 side and the fixed side radiation fin 20 side.

Reference numeral 15 denotes a fan accommodating portion 14 of the air duct 14.
A is shown a centrifugal fan that is fixed to the drive shaft 3 and is composed of a multi-blade fan or the like.
Air is sucked in from the air intake port 14C of No. 4, and the sucked air is sent into the discharge pipe 14B of the air duct 14 as cooling air.

Reference numeral 16 denotes a fan accommodating portion 14 of the air duct 14.
A pulley is located on one end side and is fitted and fixed to the proximal end of the drive shaft 3, and the pulley 16 is connected to a motor-side pulley 18B of an electric motor 18, which will be described later, via a transmission belt 17. There is.

Reference numeral 18 indicates an electric motor placed on the top plate portion 1G of the soundproof case 1, and the rotation shaft 1 of the electric motor 18
A motor side pulley 18B is fixed to 8A. Further, the rotating shaft 18A of the electric motor 18 is formed to have a length M in the axial direction so that the motor-side pulley 18B is located directly above the pulley 16. The electric motor 18 is driven when an operation switch (not shown) provided on the soundproof case 1 is turned on, and the drive shaft 3 is thereby driven via the motor-side pulley 18B, the transmission belt 17, and the pulley 16. It is rotationally driven.

Reference numeral 19 denotes a rotating side heat radiation fin located on the outer circumferential side of the boss portion 6C of the orbiting scroll 6 and provided on the back side of the end plate 6A, and 20 represents a fixed side heat radiation fin provided on the back side of the end plate 7A of the fixed scroll 7. The radiation fins 19 and 20 radiate the heat of the mirror plates 6A and 7A into the cooling air exhausted from the exhaust port 14D of the air duct 14. Here, the orbiting side radiation fins 19 are formed in a coaxial cylindrical shape surrounding the outer peripheral side of the boss portion 6C of the orbiting scroll 6, and the fixed side radiation fins 20 are used for cooling air exhausted from the exhaust port 14D of the air duct 14. It is formed into a plate shape along the flow direction.

The conventional oil-free packaged air compressor has the above-described configuration, and when the electric motor 18 rotates, this rotational force is applied to each pulley 16, 18B.
etc., to the drive shaft 3, whereby the drive shaft 3
is rotationally driven, and the orbiting scroll 6 orbits around the axis of the drive shaft 3. Due to this swirling movement, the compression chambers 8, 8, . This compressed air is discharged from the discharge port 10 to an external air tank to effect compression.

Further, the centrifugal fan 15 is rotationally driven by the rotation of the drive shaft 3, and thereby the centrifugal fan 15 blows the air sucked in from the air intake port 14C of the air duct 14 in the direction of arrow A in FIG. 4 as cooling air. do. Then, this cooling air is exhausted from each exhaust port 14D via the exhaust pipe 14B of the air duct 14, and is supplied from each exhaust port 14D to the inside of the large diameter cylindrical portion 2A of the casing 2 and to the back side of the fixed scroll 8. As a result, the heat of each end plate 6A, 7A and each wrap portion 6B, 7B whose temperature has increased due to compression heat during compression is radiated via each radiation fin 19, 20, and each wrap portion 6B, 7B, etc. Prevent it from rising.

[0018]

However, in the prior art described above, the centrifugal fan 15 is provided between the bearing portion 2B of the casing 2 and the pulley 16, and the cooling generated by the centrifugal fan 15 is Since the wind is supplied to the rotating side radiation fins 19 and the fixed side radiation fins 20 through the air duct 14, it is possible to cool the end plates 6A, 7A, etc. whose temperature has increased due to compression heat or the like. but,
Since the pulley 16 is provided at the proximal end of the drive shaft 3, the length M of the rotating shaft 18A of the electric motor 18 increases depending on the mounting position of the pulley 16. For this reason, the moment acting on the rotating shaft 18A of the electric motor 18 increases, causing abnormal wear on the bearings and the like that support the rotating shaft 18A within the electric motor 18, which shortens the life of the electric motor 18.
There is a problem in that reliability is significantly reduced.

Furthermore, since the torque of the electric motor 18 is transmitted to the proximal end of the drive shaft 3, the moment acting on the drive shaft 3 also increases, so that the drive shaft 3 can be stably supported. Therefore, it is necessary to lengthen the support span S between the bearings 4 and 5. For this reason, the length dimension L of the bearing part 2B of the casing 2 becomes long, and the workability of the casing 2 is significantly reduced. There is a problem in that it takes time and effort to accurately position and assemble, and the work efficiency of the assembly work is significantly reduced.

Furthermore, in the prior art described above, the casing 2, the centrifugal fan 15, the pulley 16, etc. are housed in the soundproof case 1 for noise and safety reasons. A gap is created between each air inlet 1B of the case 1. Therefore, the outside air from each air inlet 1B of the soundproof case 1 flows into the air duct 14.
The centrifugal fan 15 sucks a large amount of air inside the soundproof case 1 from the direction of arrow B in FIG. However, since the air inside the soundproof case 1 is warmed by compression heat generated in each compression chamber 8, not only does the cooling efficiency by the centrifugal fan 15 decrease significantly, but also
There is a problem in that each wrap portion 6B, 7B thermally expands due to an increase in temperature, and as a result, a galling phenomenon occurs in each wrap portion 6B, 7B, resulting in a significant decrease in reliability and performance.

The present invention was developed in view of the problems of the prior art described above, and it is possible to shorten the length of the rotating shaft of the motor and the bearing portion of the casing, thereby greatly improving workability and assembly workability. An object of the present invention is to provide a scroll type fluid machine that can perform the following functions.

[0022]

[Means for Solving the Problems] The structure adopted by the present invention in order to solve the above-mentioned problems includes a casing consisting of a small diameter bearing part and a large diameter cylindrical part, and a bearing interposed in the bearing part of the casing. The driving shaft is rotatably provided in the casing, and has a distal end extending into the large diameter cylindrical portion of the casing to serve as a crank, a proximal end protruding outside the casing, and a drive shaft located within the large diameter cylindrical portion of the casing. an orbiting scroll that is rotatably mounted on a crank of a shaft and has a spiral wrap section erected on an end plate; A fixed scroll is provided with a spiral wrap section standing upright to form a plurality of compression chambers between the fixed scroll and the fixed scroll, which is located outside the casing and is provided on the proximal end side of the drive shaft, which generates cooling air by rotation of the drive shaft. It consists of a cooling fan that generates electricity, and a pulley that is located on the drive shaft between the bearing part of the casing and the cooling fan, and is connected to a motor via a transmission belt.

Preferably, the cooling fan is a centrifugal fan, and a cooling air passage is provided for supplying cooling air from the centrifugal fan to the large-diameter cylindrical portion of the casing and the fixed scroll.

[0024]

[Operation] With the above configuration, the pulley is located between the bearing part of the casing and the cooling fan, so the pulley is moved from the proximal end of the drive shaft to the casing by approximately the axial length of the cooling fan. Can be installed closer to the bearing part. This allows the length of the motor's rotating shaft to be shortened depending on the pulley installation position, reducing the moment applied to the drive shaft via the pulley and shortening the length of the bearing portion of the casing. .

[0025] Furthermore, if a centrifugal fan is used as the cooling fan and a cooling air passage is provided to supply the cooling air from the centrifugal fan to the large-diameter cylindrical portion of the casing and the fixed scroll side, the cooling air generated by the centrifugal fan can , large diameter cylindrical part of the casing,
The fixed scroll can be cooled.

[0026]

Embodiments Hereinafter, embodiments of the present invention will be explained based on FIGS. 1 and 2. In the embodiment, the same components as those of the prior art shown in FIG. 3 and FIG.

In the figure, reference numeral 21 indicates a soundproof case according to the present embodiment, and the soundproof case 21 is almost the same as the soundproof case 1 described in the prior art, and has a bottom plate portion 21A, one side panel 21B, the other side panel 21C, and a top panel. Although the other side panel 21C and the top plate 21D are formed with a plurality of air outlets 21E, 21E, ..., belt insertion holes 21F, the one side panel 21B has , a duct attachment hole 21G is drilled to which an air duct 26, which will be described later, is attached.

Reference numeral 22 denotes a casing provided within the soundproof case 21, and the casing 22 is roughly composed of a large diameter cylinder portion 22A and a bearing portion 22B, similar to the casing 2 described in the prior art. Although the inflow hole 22C and the outflow hole 22D are formed in the portion 22A as shown in FIG. 2, the bearing portion 22B of the casing 22 has a length shorter than the length L of the bearing portion 2B described in the prior art. Size L1 (
L1<L).

Reference numeral 23 designates a drive shaft, and the drive shaft 23 is rotatably supported by the bearing portion 22B of the casing 22 via bearings 24 and 25, almost like the drive shaft 3 described in the prior art. Although the crank 23A extends into the large diameter cylindrical portion 22A of the casing 22, the drive shaft 2
A centrifugal fan 27 (described later) is attached to the proximal end of the casing 3, and a pulley 28 (described later) is attached to the intermediate portion between the centrifugal fan 27 and the bearing portion 22B of the casing 22. Further, each of the bearings 24 and 25 supports the drive shaft 23 with a support span S1 (S1<S) that is shorter than the support span S between the bearings 4 and 5 described in the prior art.

Reference numeral 26 indicates an air duct as a cooling air passage provided in the soundproof case 21, and as shown in FIG.
A fan accommodating portion 26A is fitted and attached within the casing 22 and is formed to cover the proximal end side of the drive shaft 23. The proximal end communicates with the fan accommodating portion 26A, and the distal end communicates with the large diameter of the casing 22. It is composed of a cylindrical portion 22A and a discharge pipe 26B extending toward the fixed scroll 7 side. Furthermore, a plurality of intake ports 26C, 26C, . 26
D, 26D are formed.

Reference numeral 27 indicates a centrifugal fan as a cooling fan, and the centrifugal fan 27 is similar to the centrifugal fan 1 described in the prior art.
5, the centrifugal fan 27 is located within the fan accommodating portion 26A of the air duct 26 and is fixed to the proximal end of the drive shaft 23.

Reference numeral 28 indicates a pulley located between the bearing portion 22B of the casing 22 and the centrifugal fan 27 and fixed to the intermediate portion of the drive shaft 23, and the pulley 28 is almost the same as the pulley 16 described in the prior art. It is connected to an electric motor 30, which will be described later, via a transmission belt 29 and the like.

Reference numeral 30 indicates an electric motor placed on the top plate portion 21D of the soundproof case 21, and the electric motor 30 is similar to the electric motor 18 described in the prior art. Although the pulley 30B is attached, the rotating shaft 30A has a length shorter than the length M of the rotating shaft 18A of the electric motor 18 described in the prior art so that the motor side pulley 30B is located directly above the pulley 28. Size M
1 (M1 <M).

The package type air compressor according to this embodiment has the above-mentioned configuration, and there is no particular difference in its basic operation from that of the prior art.

However, in this embodiment, the pulley 28 is located between the bearing portion 22B of the casing 22 and the centrifugal fan 27 and is provided in the middle of the drive shaft 23, so as shown in FIG. The mounting position of the pulley 28 is changed from the proximal end of the drive shaft 23 to the bearing portion 22B of the casing 22 by ΔL, which is approximately equal to the axial length of the centrifugal fan 27, compared to the mounting position of the pulley 16 according to the prior art. The length dimension M1 of the rotating shaft 30A of the electric motor 30 is also the same as that of the rotating shaft 18 of the electric motor 18 according to the prior art.
It can be formed to be shorter than the length dimension M of A by ΔL.

Furthermore, since the moment applied to the drive shaft 23 can be reduced, the support span S1 of each bearing 24, 25 can be reduced.
, the length L1 of the bearing portion 22B of the casing 22 is also
The support span S between the bearings 4 and 5 and the length L of the bearing portion 2B of the casing 2 can be reliably made shorter by approximately ΔL, respectively, as described in the prior art.

As a result, the rotating shaft 30A of the electric motor 30
By effectively reducing the moment acting on the rotary shaft 30A, abnormal wear can be prevented from occurring in the bearings supporting the rotating shaft 30A, and the life and reliability of the electric motor 30 can be greatly improved. Also, a bearing 2 supporting the tip side of the drive shaft 23 is provided.
Not only can the life of the bearing 25 be improved by reducing the bearing reaction force applied to the bearing 25, but also the length L1 of the bearing portion 22B of the casing 22 can be shortened.
It is possible to improve the workability of item 2, and the work efficiency of assembly work can be greatly increased.

Furthermore, in this embodiment, since the centrifugal fan 27 is provided at the proximal end of the drive shaft 23, the fan accommodating portion 26A of the air duct 26 is fitted into the duct mounting hole 21G of the soundproof case 21. It is possible to install the fan accommodating portion 26A directly into the fan accommodating portion 26A through the respective intake ports 26C, thereby allowing cold outside air to flow directly into the fan housing portion 26A. As a result, centrifugal fan 2
The temperature of the cooling air generated from the centrifugal fan 7 can be effectively lowered, the cooling efficiency of the centrifugal fan 27 can be greatly improved, and galling phenomenon can be prevented from occurring in each of the lap parts 6B and 7B. , reliability, performance, etc. can be significantly improved.

In the above embodiment, the centrifugal fan 27 made of a multi-blade fan or the like is used as the cooling fan, but instead of this, for example, an axial fan may be used.

Further, in the above embodiment, a package type scroll air compressor was explained as an example of the scroll type fluid machine, but the present invention is not limited to this. electric motor 3 on the support plate
A non-package type configuration in which 0 is installed may also be used.

Furthermore, in the above embodiments, an oil-free scroll air compressor that does not supply any lubricating oil into the casing 22 has been described as an example, but the present invention is not limited to this, and for example, As in JP-A-2-102690, JP-A-2-248675, etc., a seal member is provided between the orbiting scroll and the fixed scroll, and a seal member is provided between the orbiting scroll and the thrust receiving part of the casing, and between the thrust receiving part of the fixed scroll and the like. It can also be used in a scroll-type fluid machine in which lubricating oil is supplied between the lap parts and the head plate, but no lubricating oil is supplied between each wrap part and the end plate.

Furthermore, the scroll type fluid machine of the present invention can be widely applied as a vacuum pump for compressing refrigerants such as fluorocarbon gas, industrial gases such as nitrogen gas, or connecting to a vacuum tank to perform evacuation. be able to.

[0043]

As described in detail above, according to the present invention, there is provided a cooling fan that is located outside a casing and is provided on the base end side of a drive shaft, and that generates cooling air by rotation of the drive shaft; Since a pulley is provided on the drive shaft between the bearing part of the drive shaft and the cooling fan, and is connected to the motor via the transmission belt, the pulley can be connected to the cooling fan from the proximal end of the drive shaft. It can be installed closer to the bearing part of the casing by the axial length dimension, so the length of the motor's rotating shaft can be shortened according to the pulley installation position, and it can be applied to the drive shaft via the pulley. The moment can be reduced and the length of the bearing portion of the casing can be shortened. As a result, the moment acting on the rotating shaft of the motor can be effectively reduced, the life and reliability of the motor can be improved, and the workability of the casing and the efficiency of assembly work can be improved.

In addition, since a centrifugal fan is used as the cooling fan and a cooling air passage is provided to supply the cooling air from the centrifugal fan to the large-diameter cylindrical portion of the casing and the fixed scroll side, the cooling generated by the centrifugal fan is The large-diameter cylindrical part of the casing and fixed scroll can be effectively cooled by the wind, and each wrap part is prevented from increasing in temperature and thermally expanding due to compression heat, etc., and effectively preventing galling. can be prevented and reliability can be improved.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing a scroll air compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along arrow II-II in FIG. 1;

FIG. 3 is a longitudinal sectional view showing a scroll air compressor according to the prior art.

FIG. 4 is a sectional view taken along arrow IV-IV in FIG. 3;

[Explanation of symbols]

6 Orbiting scrolls 6A, 7A End plates 6B, 7B Wrap section 7 Fixed scroll 22 Casing 22A Large diameter cylinder section 22B Small diameter cylinder section 23 Drive shaft 23A Crank 24, 25 Bearing 26 Air duct (cooling air passage) 27 Centrifugal fan (cooling fan) 28 Pulley 29 Transmission belt 30 Electric motor

Claims (2)

[Claims] Claim 1: A casing consisting of a small-diameter bearing part and a large-diameter cylindrical part, and a casing rotatably provided in the bearing part of the casing via a bearing, with a distal end extending into the large-diameter cylindrical part of the casing. A drive shaft that serves as a crank and has a proximal end protruding outside the casing, and is located inside the large diameter cylindrical portion of the casing and is rotatably provided on the crank of the drive shaft, with a spiral wrap portion erected on the end plate. an orbiting scroll fixedly attached to the large-diameter cylindrical portion side of the casing;
a fixed scroll in which a spiral wrap part that forms a plurality of compression chambers between the end plate and the wrap part of the orbiting scroll is erected; a fixed scroll located outside the casing and provided on the proximal end side of the drive shaft; a cooling fan that generates cooling air by rotation of the drive shaft; a pulley that is located on the drive shaft between the bearing part of the casing and the cooling fan and is connected to the motor via a transmission belt; A scroll type fluid machine consisting of. 2. The cooling fan is a centrifugal fan,
2. The scroll fluid machine according to claim 1, further comprising a cooling air passage for supplying cooling air from the centrifugal fan to the large-diameter cylindrical portion of the casing and the fixed scroll side.