JP3341930B2 - Scroll type fluid machine - Google Patents

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 or a vacuum pump, and more particularly to an oilless scroll type fluid machine.

[0002]

2. Description of the Related Art Conventionally, a cylindrical casing having a bearing at a base end thereof, a drive shaft rotatably provided at a bearing of the casing and having a distal end extending into the casing to serve as a crank; A orbiting scroll provided rotatably on the crank of the drive shaft; and a fixed scroll provided on the distal end side of the casing opposite to the orbiting scroll and forming a plurality of compression chambers between the orbiting scroll and the orbiting scroll. Such scroll type fluid machines are known.

When this kind of scroll type fluid machine is used as an air compressor, the orbiting scroll is orbited by driving the drive shaft from the outside with an electric motor or the like, so that the orbiting scroll and the fixed scroll are rotated. The compressed air is discharged from the discharge port to an external air tank or the like while compressing the air sucked from the outside in the compression chamber formed at the outside.

Here, in the conventional air compressor,
Prevents the generation of heat of compression in each compression chamber during the compression action, thereby preventing the fixed scroll, the orbiting scroll, etc. from being deformed due to thermal expansion or temperature unevenness, and the generation of frictional heat from bearings provided in the casing. For this purpose, a cooling fan for air cooling is provided outside the casing, the whole is accommodated in a box-shaped fan casing, and cooling air generated by rotation of the cooling fan is circulated between the casing and the casing inside the fan casing. It is common practice to air-cool from outside.

[0005]

However, in the case where a cooling fan or a fan casing is provided outside the casing of an air compressor as in the above-mentioned prior art, the entire apparatus becomes large and complicated, and the production cost increases. Would.

Further, since the cooling air only flows outside the casing, it is difficult to cool the orbiting scrolls, bearings, and the like in the casing by the cooling air, and in particular, there is no oil supply without an oil reservoir in the casing. In the air compressor of the type, there is a problem that it is difficult to cool portions of the casing where sliding and heat generation are severe with cooling air from a cooling fan.

The present invention has been made in view of the above-mentioned problems of the prior art, and the present invention provides a cooling fan in a casing, which can prevent the entire apparatus from being enlarged, and can slide and generate heat in the casing. It is an object of the present invention to provide a scroll-type fluid machine capable of efficiently cooling a part.

[0008]

In order to solve the above problems SUMMARY OF THE INVENTION The feature of the configuration invention of claim 1 is employed, casings
Provided in the casing for flowing cooling air through the casing.
Between the bearing and the orbiting scroll of the casing.
And a cooling fan that is rotationally driven by a drive shaft, and is provided outside the casing and the fixed scroll.
And the opening of the fixed scroll is
Extended toward the inlet of the casing through the surface side
And a duct for rotating the cooling fan.
The outside air sucked from the opening portion is moved to the fixed scroll.
From the back side of the casing through the inlet of the casing
The structure is such that the cooling air is circulated into the airbag . Further, according to the invention of claim 2, the fixed scrow
The metal outlet is made of a metal material with high thermal conductivity.
And a discharge pipe extending through the duct.
And

[0009]

According to the above construction, since the cooling fan is provided in the casing, the entire apparatus can be reduced in size, and the cooling air can be generated directly in the casing by the cooling fan, and the inside of the casing can be efficiently cooled by the cooling air. it can. In addition, the casing and the fixed scroll
The duct provided on the outside is turned by the rotation of the cooling fan
Outside air sucked from the opening of the fixed scroll
Cooling air into the casing via the casing inlet
As it is distributed as
The rear side of the tool can be cooled by cooling air.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 using an oilless scroll type air compressor as an example.

In FIG. 1, reference numeral 1 denotes a stepped tubular casing. The casing 1 has a bottom 1A, a large-diameter tubular portion 1B extending from the outer periphery of the bottom 1A to the distal end, and a large-diameter tubular portion 1B.
And a bottom 1A integrally formed on the tip side of the
And a small-diameter cylindrical bearing portion 1D protruding from the center toward the base end side in the axial direction. On the inner peripheral side of the large-diameter cylindrical portion 1B, three bearing accommodating portions 1E (only one is shown) projecting inward in the radial direction are slidably in contact with the back surface of the orbiting scroll 7 described later. A thrust receiving portion 1F for receiving a load in the thrust direction is formed. In addition, a cooling air inlet 1 which is located at the upper end in FIG. 1 and communicates between the inside and outside of the casing 1 is provided at the base end side of the large-diameter cylindrical portion 1B.
G and an outlet 1H are formed. Further, the flange portion 1C corresponds to the position of the cooling air inlet 1G,
The inflow port 1G is provided with a ventilation hole 1J for communicating a ventilation path 17 described later.

Reference numeral 2 denotes a fixed scroll fixed to a flange portion 1C of the casing 1 via bolts or the like (not shown). The fixed scroll 2 has a center coincident with an axis OO of a drive shaft 3 described later. A mirror plate 2A disposed at the center, a spiral wrap portion 2B erected with the center side of the mirror plate 2A as a winding start end and an outer peripheral side as a winding end end, and a radial direction of the wrap portion 2B. A thrust receiving portion 2C formed on the outside and slidingly contacting a head plate 7A of the orbiting scroll 7 described later to receive a load in the thrust direction, and a flange portion 1C formed on the radially outside of the thrust receiving portion 2C and formed on the thrust receiving portion 2C. And a flange portion 2D which abuts with the flange portion 2D. The flange portion 2D is formed with a ventilation hole 2E similar to the ventilation hole 1J provided in the flange portion 1C of the casing 1.

Reference numeral 3 denotes a bearing 4 on the bearing portion 1D of the casing 1.
5 shows a drive shaft rotatably supported via 5, and the distal end side of the drive shaft 3 extends into the large-diameter cylindrical portion 1 </ b> B of the casing 1 to become a crank 3 </ b> A, and the crank 3 </ b> A The axis O'-O 'is eccentric by a predetermined dimension d with respect to the axis OO. A pulley 6 is provided on the base end side of the drive shaft 3 projecting from the bearing portion 1D of the casing 1 to the outside. The drive shaft 3 is connected to the pulley 6 via an electric motor (not shown) via a belt. Is driven to rotate.

Reference numeral 7 denotes an orbiting scroll which is located in the casing 1 and is rotatably attached to the crank 3A of the drive shaft 3. The orbiting scroll 7 comprises a disk-shaped head plate 7A and a head plate 7A. A spiral wrap portion 7B is provided with the center side serving as a winding start end and the outer periphery side serving as a winding end end, and a boss portion 7C provided at the center of the rear surface of the end plate 7A.
The crank 3A of the drive shaft 3 is mounted in the boss portion 7C via a turning bearing 8.

Here, a wrap portion 7 of the orbiting scroll 7 is provided.
B is disposed so as to overlap the wrap portion 2B of the fixed scroll 2 by a predetermined angle, and
Are formed so as to continuously reduce with the wrap portion 7B during the rotation of the compression chambers 9, 9,....

Reference numeral 10 denotes an auxiliary crank (only one is shown) which is located between the bearing accommodating portion 1E of the casing 1 and the end plate 7A of the orbiting scroll 7 and is provided in the circumferential direction and is provided with, for example, three auxiliary cranks. The auxiliary crank 10 has a large-diameter main shaft portion 10A provided on one side, and a small-diameter eccentric shaft portion 10B protrudingly provided on the other side of the main shaft portion 10A. The main shaft portion 10A is rotatably supported in the bearing receiving portion 1E of the casing 1 via a ball bearing 11, and the eccentric shaft portion 10B is mounted on the back side of the orbiting scroll 7 via a ball bearing 12, The auxiliary crank 10 is the orbiting scroll 7
When turning, the eccentric shaft portion 10B revolves around the main shaft portion 10A with a turning radius of a distance d.

Reference numeral 13 denotes a suction port formed on the outer peripheral side of the fixed scroll 2, and reference numeral 14 denotes a discharge port formed on the end plate 2A of the fixed scroll 2, and the suction port 13 is the outermost side (lowest pressure side). The discharge port 14 communicates with the compression chamber 9 on the most central side (highest pressure side).

Reference numeral 15 denotes a duct provided on the casing 1 and the fixed scroll 2 so as to cover the fixed scroll 2 from the outside. The duct 15 is formed in a closed cylindrical shape so as to cover the end plate 2A from the back side. A lid 15A fixed to the back side of the scroll 2; and an extension duct 15B extending from the outer periphery of the lid 15A toward the inlet 1G of the casing 1 and having a substantially U-shaped cross section. Approximately. Here, the duct 15 has a lid 1
An opening 15C communicating with the outside air is formed on the lower surface side of 5A, and a fixed scroll cooling space 16 communicating with the opening 15C is defined between the lid 15A of the duct 15 and the fixed scroll 2. I have. In addition, the extension duct 15
A ventilation path 17 communicating with the fixed scroll cooling space 16 is formed between the fixed scroll cooling cavity 16 and the fixed scroll cooling space 16. It is connected to one inlet 1G.

When a cooling fan 19, which will be described later, rotates, the duct 15 sucks outside air from the opening 15C into the fixed scroll cooling space 16, and circulates the outside air as cooling air in the direction of arrow A in FIG. The fixed scroll 2 and the ventilation holes 2 of the flange portions 2D, 1C of the casing 1
E, 1J, the inflow port 1G, and the like allow the air to flow into the casing 1 from the ventilation path 17.

Numeral 18 denotes a balance weight. The balance weight 18 is a disk-shaped member fixed on the drive shaft 3 so that its center coincides with the axis OO of the drive shaft 3, as shown in FIG. The support portion 18A is formed in an arc shape with a predetermined projecting dimension from the outer peripheral side of the support portion 18A.
A weight portion 18C having a substantially C-shaped cross section having a cutout portion 18B on the A side, and a bow-shaped balance adjustment hole 18D formed in the support portion 18A and located between the cutout portion 18B and the drive shaft 3. Have been. The balance weight 18 rotates integrally with the drive shaft 3 and balances the orbiting scroll 7 when the drive shaft 3 rotates.

Reference numeral 19 denotes a cooling fan located between the bearing portion 1D of the casing 1 and the orbiting scroll 7 and mounted radially outside the balance weight 18. The cooling fan 19 is concentric with the balance weight 18. Arranged,
It rotates integrally with the drive shaft 3 inside a cooling air guide 20 described later. The cooling fan 19 generates a negative pressure in the large-diameter cylindrical portion 1B of the casing 1 at the time of rotation, and cools the cooling air sucked from the opening 15C of the duct 15 through an inflow hole 22A of a fan plate 22 described later. The air is sucked into the cooling air guide 20 and exhausted to the outside through the outlet 1H of the casing 1.

Reference numeral 20 denotes a cooling air guide which is located around the cooling fan 19 and is provided in the casing 1. The cooling air guide 20 is composed of a vortex plate 21 and a fan plate 22, which will be described later, mounted on the bottom 1A. It is roughly composed of

Reference numeral 21 denotes a spiral plate mounted on the bottom 1A of the casing 1 via a fixing pin or the like.
As shown in FIG. 2, is formed in a spiral shape around the axis O-O of the drive shaft 3, one end 21A covers the outside of the cooling fan 19 through a minute gap, and the other end 21B gradually becomes. While making a round around the cooling fan 19, and inscribed in the outlet 1 </ b> H of the casing 1. And the spiral plate 21
A radial gap 21C is formed between the one end 21A and the other end 21B, and the gap 21C communicates with the outlet 1H.

Reference numeral 22 denotes a fan plate attached to the tip of the spiral plate 21. The fan plate 22 has a cooling air inflow hole 22 opened in the cooling fan 19 at the center.
A is formed, and the outer peripheral side of the fan plate 22 closes the distal end side of the spiral plate 21. The fan plate 22 draws cooling air into the cooling fan 19 through the inflow hole 22A, and rotates the cooling fan 19 to exhaust the cooling air from the outlet 1H of the casing 1 to the outside of the casing 1. Arrow A in 1
The cooling air in the direction is circulated.

Reference numeral 23 denotes a discharge pipe, and the discharge pipe 2
3 is a tube portion 23A made of a metal material having high thermal conductivity.
And a plurality of radiating fins 23B, 23B,... Protruding and formed radially apart from each other in the axial direction of the pipe portion 23A. The base end is connected to the discharge port 14 of the fixed scroll 2, and the front end is attached so as to penetrate the lid 15 </ b> A of the duct 15. The discharge pipe 23 communicates with the compression chamber 9 formed at the center of the fixed scroll 2,
The compressed air discharged from the compression chamber 9 and the fixed scroll 2 heated by the heat of the compressed air are cooled by the cooling air in the fixed scroll cooling space 16 to each of the radiation fins 23.
Cooling is performed through B.

The scroll type air compressor according to the present embodiment has the above-described structure. When the drive shaft 3 is driven to rotate by an electric motor, this rotation is transmitted from the crank 3A to the orbiting scroll 7 via the orbiting bearing 8. Can be At this time, the rotation movement of the orbiting scroll 7 is prevented by the auxiliary crank 10 and the orbiting scroll 7 makes a orbital movement with a turning radius of the dimension d around the axis OO of the drive shaft 3. The compression chambers 9, 9,... Defined between the wrap portions 2B, 7B due to this swirling motion are continuously reduced, and the suction ports 13 are formed.
The compressed air is discharged from the discharge port 14 to an external air tank or the like via the discharge pipe 23 while compressing the air sucked in from the compression chamber 9 sequentially.

In this embodiment, the fixed scroll 2
A duct 15 extending toward the inlet 1G of the casing 1 from the back side of the casing 1 is provided outside the casing 1 and the fixed scroll 2, and a cooling fan 19 that rotates integrally with the drive shaft 3 is provided in the casing 1; Plate 21 that surrounds the periphery of the spiral in a spiral shape, and a cooling air guide 20 that includes a fan plate 22 that closes the distal end side of the spiral plate 21 and allows cooling air to flow into the cooling fan 19 from the inflow hole 22A.
And the outside air sucked from the opening 15C of the duct 15 is allowed to flow as cooling air from the inlet 1G of the casing 1 into the casing 1 in the direction indicated by the arrow A and discharged from the outlet 1H. The operation and effect described above are achieved.

That is, the outside air from the inflow port 1G is sucked into the cooling fan 19 through the inflow hole 22A of the cooling air guide 20 by the rotation of the cooling fan 19, and at this time, from inside the casing 1 from outside in the radial direction. A cooling wind in the direction of arrow A is generated toward the center. Here, since the orbiting scroll 7 is performing a revolving motion in the casing 1, the cooling wind rotates on the thrust receiving portion 1F, the auxiliary crank 10, the end plate 7A of the orbiting scroll 7 and the like while revolving in the same direction as the orbiting scroll 7. Air cooling from.

The cooling air sucked into the cooling fan 19 from the inflow hole 22A of the cooling air guide 20 cools the surfaces of the boss portion 7C of the orbiting scroll 7, the orbiting bearing 8, the crank 3A and the like while cooling the surface. The part also flows through the balance adjusting hole 18D of the balance weight 18 to the bearing part 1D side to cool the bearing 4 by air.

Thus, according to the present embodiment, the cooling fan 19 can be compactly accommodated in the casing 1 and can be cooled by the cooling fan 19 at a position close to the bearings 4, 5, 8 and the orbiting scroll 7 in the casing 1. Since the wind can be generated, the bearings 4, 5, 8 and the orbiting scroll 7 and the like can be effectively cooled by a cooling wind having a high flow velocity, and these sliding and heat-prone portions are reliably air-cooled from the inside of the casing 1. Can be.

Further, a duct 15 for defining a fixed scroll cooling space 16 is provided between the fixed scroll 2 and the fixed scroll 2 on the back side of the fixed scroll 2 so as to allow cooling air to flow through the casing 1. A discharge pipe 23 made of a metal material having high thermal conductivity and having a plurality of radiating fins 23B, 23B,... Is provided in the middle of the cooling space 16 so as to be connected to the discharge port 14 of the fixed scroll 2. The fixed scroll 2 which is heated by the compressed air discharged from the compression chamber 9 formed at the most central side of the fixed scroll 2 and the high heat from the compressed air is cooled by the cooling air flowing through the fixed scroll cooling space 16. Thus, thermal deformation of the end plate 2A and the wrap portion 2B of the fixed scroll 2 can be effectively prevented.

Therefore, according to the present embodiment, the casing 1
The cooling fan 19 and the cooling air guide 20 can be housed in a compact manner, and the size of the entire apparatus can be reduced as compared with the prior art. Receiving part 1F, auxiliary crank 1
0 and the end plate 2A of the orbiting scroll 7 and the like can be efficiently cooled, and the entire device can be reduced in size and lengthened in life.

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

[0034]

As described above in detail, according to the calling <br/> light according to claim 1, the inlet of the cooling air provided in the casing,
An outlet, a cooling fan provided between the bearing portion of the casing and the orbiting scroll and provided in the casing and driven to rotate by a drive shaft;
Opening that is provided outside the fixed scroll and sucks outside air
Part from the case through the back side of the fixed scroll
A duct extending toward the inlet of the housing.
Is sucked from the opening by the rotation of the cooling fan.
Air from the rear side of the fixed scroll.
Cooling air flows into the casing through the
Treasure and configured to pass, a cooling fan in the casing can be accommodated in <br/> compact, it is possible reduce the size of the entire apparatus, bearing in Ke pacing, crank, etc. orbiting scroll, severe particular sliding, the heating The part can be cooled effectively. And casing and fixed scroll
Is provided by the rotation of the cooling fan.
Outside air sucked from the opening of the fixed scroll
Cooling air into the casing via the casing inlet
As it is distributed as
The rear side of the tool can be cooled by cooling air. Ma
According to the invention of claim 2, the fixed scrow
The metal outlet is made of a metal material with high thermal conductivity.
And a discharge pipe extending through the duct is provided.
Pressure from the fixed scroll discharge port
Fixed screw heated by high heat from compressed air and compressed air
The roll is cooled by cooling air flowing through the duct
Can effectively prevent thermal deformation of the fixed scroll.
Can be

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view taken in the direction of arrows II-II in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Casing 1D Bearing part 2 Fixed scroll 3 Drive shaft 3A crank 7 Orbiting scroll 9 Compression chamber 15 Duct 16 Fixed scroll cooling space 17 Ventilation path 19 Cooling fan 20 Cooling air guide 21 Vortex plate 22 Fan plate

Claims (2)

(57) [Claims] 1. A tubular casing having a base end serving as a bearing portion, a fixed scroll fixed to and fixed to a distal end of the casing so as to close the distal end of the casing.
A drive shaft rotatably provided on a bearing portion of the casing, a tip end side of which is a crank; and a revolving scroll which is rotatably provided on a crank of the drive shaft and forms a plurality of compression chambers with the fixed scroll. in the scroll fluid machine comprising a said for circulating cooling air in the casing Keshi
Inlet of the cooling air provided in the ring, an outlet, provided in the casing positioned between the bearing portion and the orbiting scroll before Symbol casing, a cooling fan that is rotationally driven by the drive shaft, Provided outside the casing and the fixed scroll.
And the back of the fixed scroll
Extending toward the inlet of the casing through the side
The duct is connected to the opening by rotation of the cooling fan.
From outside of the fixed scroll
Cooling air flows into the casing through the casing inlet.
A scroll-type fluid machine characterized by having a configuration for circulation . A discharge port of the fixed scroll;
Formed of a highly conductive metal material, penetrating the duct
The scroll according to claim 1, further comprising a discharge pipe that extends.
Fluid machine.