JP2002013492A - Scroll type fluid machine - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To directly guide cooling air from a cooling fan to the rear side of a fixed scroll and the rear side of a revolving scroll, respectively.
The cooling efficiency of each of these scrolls is increased. SOLUTION: Fixed scrolls 7A and 7B and electric motor 11 are provided.
The eccentric bearings 14A and 14B are provided between the eccentric bearings 14A and 14B. Further, the rotating shaft 2 is attached to the inner rings 20A, 20B of the eccentric bearings 14A, 14B.
2 are provided at both ends of the turning shaft 22.
Orbiting scrolls 28A and 28B are fixedly provided via 4A and 24B. The cooling fan 41 is located on the outer peripheral side of the casing 1 at a position where the suction ports 39A and 39B are opened.
A, 41B are provided, and the cooling air from the cooling fans 41A, 41B flows through the fixed scroll side passages 45A, 45B and the orbiting scroll side passages 46A, 46B.

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 suitably used as, for example, an air compressor.

[0002]

2. Description of the Related Art Generally, a scroll-type fluid machine includes a casing, a fixed scroll provided on the casing and having a spiral wrap portion provided on a head plate, a drive shaft rotatably provided on the casing. A rotary scroll provided in the casing so as to be rotatable at the tip end side of the drive shaft and having a lap portion on a head plate and overlapping with the wrap portion of the fixed scroll to define a plurality of compression chambers. It is known (for example, JP-A-8-100777).

A conventional scroll type fluid machine of this type is provided on the outer peripheral side of a fixed scroll by rotating a driving shaft from the outside and orbiting the orbiting scroll with a fixed eccentricity relative to the fixed scroll. While sucking a fluid such as air from the suction port, the fluid is sequentially compressed in each compression chamber between the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll, and compressed from the discharge port provided at the center of the fixed scroll. Discharge the fluid to the outside.

In this prior art, a base end of a drive shaft is projected outside a casing, and a cooling fan is provided integrally with the projected end of the drive shaft. During the compression operation, the cooling fan is driven to rotate by the drive shaft, and the cooling air from the cooling fan is directed to the rear side of the fixed scroll and the rear side of the orbiting scroll through a duct provided on the side surface (outer peripheral side) of the casing. It is configured to guide and cool each of these scrolls.

[0005]

By the way, in the above-mentioned scroll type fluid machine according to the prior art, the cooling fan is arranged at a position opposite to the fixed scroll with the casing interposed therebetween. Since the cooling air duct is routed from the cooling fan side to the rear side of the fixed scroll via the side surface of the casing, the entire length of the duct becomes relatively long, and cooling in the duct The wind pressure loss increases in proportion to the length of the duct and the like.

As a result, when the cooling air from the cooling fan reaches the fixed scroll side and the orbiting scroll side through the duct, the flow velocity of the cooling air decreases, and the cooling efficiency of these scrolls cannot be sufficiently increased. is there.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and an object of the present invention is to eliminate the need for a duct for a cooling fan, and to allow the cooling air from the cooling fan to rotate on the rear side of the fixed scroll. An object of the present invention is to provide a scroll-type fluid machine in which the fixed scroll and the orbiting scroll are guided directly to the rear side of the scroll so that the fixed scroll and the orbiting scroll can be efficiently cooled.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a scroll type fluid machine according to the present invention comprises a casing and a fixed scroll provided on the casing and having a spiral wrap portion standing upright on a head plate. A fixed-side member, a drive shaft rotatably provided in the casing, and a plurality of compression chambers overlapped with the wrap portion of the fixed scroll on the end plate provided rotatably on the tip side of the drive shaft in the casing. A revolving scroll on which a defining lap portion is provided.

A feature of the structure adopted by the first aspect of the present invention is that a cooling fan that supplies cooling air to the back side of the fixed scroll and the back side of the orbiting scroll is provided on the outer peripheral side of the fixed side member. The configuration is provided.

[0010] With this configuration, the cooling air from the cooling fan can be directly supplied to the rear side of the fixed scroll during the compression operation, and the fixed scroll can be efficiently cooled. Also, the cooling air from the cooling fan can be directly supplied to the back side of the orbiting scroll, and the cooling efficiency of the orbiting scroll can be increased.

Further, according to the present invention, a suction port for sucking a fluid into the compression chamber is provided on an outer peripheral side of the fixed side member,
The cooling fan is arranged at a position where the suction port is opened. Thus, during the compression operation, the periphery of the suction port can be cooled by the cooling fan, and the temperature of the fluid sucked into the suction port can be kept low. Further, the external fluid can be smoothly guided from the suction port into the compression chamber using the cooling fan.

Further, according to the present invention, a fixed scroll side passage for supplying cooling air from a cooling fan is provided on the back side of the fixed scroll, and cooling air from the cooling fan is provided on the back side of the orbiting scroll. An orbiting scroll side passage to be supplied is provided. Thereby, the cooling air from the cooling fan can be smoothly circulated along the fixed scroll side passage and the orbiting scroll side passage, and the fixed scroll and the orbiting scroll can be cooled more efficiently.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a scroll type air compressor will be described in detail as an example of a scroll type fluid machine according to an embodiment of the present invention with reference to the accompanying drawings.

FIG. 1 to FIG. 9 show an embodiment of the present invention, and 1 is a cylinder which forms an outer frame of a scroll type air compressor and forms a fixed member together with fixed scrolls 7A and 7B which will be described later. Shows a casing in the shape of
Is constituted by a cylindrical portion 2 having an axis O1-O1 (see FIG. 3) and lid portions 3A and 3B described later.

Reference numerals 3A and 3B denote first and second lids which are located on both ends of the cylindrical portion 2 of the casing 1 and are fixed to bearing mounting cylinders 5A and 5B, which will be described later. 3A is formed in a bottomed cylindrical shape, and its upper outer peripheral side has a cooling fan 4 described later.
1A is a flat portion 3A1 to be attached. Also,
A substantially rectangular opening 3A2 (see FIG. 2) is formed in the flat portion 3A1 of the lid 3A at the outer peripheral side of a fixed scroll 7A described later. And this opening 3A2
Communicates with a later-described suction port 39A and constitutes a part of the suction port 39A.

The flat portion 3A1 of the lid 3A has
As shown in FIG. 3, a substantially rectangular ventilation hole 3A3 is formed at a distance from the opening 3A2 in the axial direction of the casing 1, and another ventilation hole 3A4 substantially similar to the ventilation hole 3A3 is formed on the lower side of the lid 3A. Are formed. These ventilation holes 3A3 and 3A4 are opened on the outer peripheral side of the orbiting scroll 28A to be described later, and allow cooling air from the cooling fan 41A to flow through the orbiting scroll side passage 46A to be described later.

Further, on the bottom end surface of the lid 3A,
A plurality of radiating fins 4A, 4A,... Each of the radiation fins 4A radiates the compression heat and the like transmitted from the compression chamber 34A described later to the fixed scroll 7A side into the fixed scroll side passage 45A described later. In the lid 3A, a fixed scroll side passage 45A described later is provided between the heat radiation fins 4A.

The flat portion 3B 1,
It has an opening 3B2, a ventilation hole 3B3 and another ventilation hole 3B4, and a plurality of radiation fins 4B, 4B on its bottom end surface.
B, ... are erected.

Reference numerals 5A and 5B denote first and second bearing mounting cylinders provided between the cylindrical portion 2 and the lid portions 3A and 3B, respectively, and forming a part of the casing 1. The outer peripheral side of the bearing mounting cylinder 5A is fixedly attached to the cylindrical section 2 together with the lid 3A with bolts 6A, and an eccentric bearing 14A described later is mounted on the inner peripheral side.

The bearing mounting cylinder 5A has two receiving holes 5 located on the side facing the thrust receiving plate 24A to be described later.
A1 (only one is shown) is provided. The receiving hole 5A1 is provided in the receiving hole 25A2 of the thrust receiving plate 24A.
And a bearing 36 described later is accommodated therein.

The second bearing mounting cylinder 5B is similarly constructed, and is fixed to the cylinder 2 together with the lid 3B by bolts 6B.

Reference numerals 7A and 7B denote first and second fixed scrolls which are located on both sides in the axial direction of the casing 1 and are fixedly provided on the inner peripheral side of the tubular portion 2, respectively. , Formed in a substantially disk shape, and arranged such that the center thereof coincides with the axis O1 -O1 of the casing 1, and a head plate 8A,
Spiral wrap portion 9A erected on the surface of end plate 8A
And a fitting tube portion 10A that protrudes in the axial direction so as to surround the wrap portion 9A from the outer peripheral side of the end plate 8A and is fitted to the inner peripheral side of the cylindrical portion 2.

The second fixed scroll 7B is also constituted by a head plate 8B, a wrap portion 9B, and a fitting cylindrical portion 10B.

An electric motor 11 is provided between the fixed scrolls 7A and 7B and provided at an intermediate portion in the casing 1. The electric motor 11 includes a stator 12 fixedly provided on the inner peripheral side of the casing 1, A rotor 13 is provided on the inner peripheral side of the stator 12 so as to be rotated by the stator 12. The axis of the stator 12 and the axis of the rotor 13 are arranged on the same axis as the axis O1 -O1 of the casing 1. Have been. The electric motor 11 drives a rotating shaft 21 described later by rotating the rotor 13.

14A and 14B are fixed scrolls 7A and 7
B and the motor-mounted motor 11
A first and second eccentric bearings provided on the inner peripheral side of A and 5B, the first eccentric bearing 14A includes an outer ring 15A and a plurality of spheres serving as outer rolling elements on the inner peripheral side of the outer ring 15A. 16A, an outer middle wheel 17A fixed to the outer peripheral side of the rotating shaft 21, an inner middle wheel 18A fixed to the inner peripheral side of the rotating shaft 21, and an inner peripheral side of the inner middle wheel 18A. And an inner ring 20A rotatably provided by a plurality of spheres 19A serving as inner rolling elements.

Here, the outer ring 15A is press-fitted and mounted on the inner peripheral side of the bearing mounting cylinder 5A, and is disposed on the axis O1-O1. Further, the outer middle wheel 17A is positioned on the inner peripheral side of the outer wheel 15A by the sphere 16A, and the axis O1-O1 is formed.
Is placed on top. Then, in this state, the sphere 16A rolls about the axis O1-O1 between the outer ring 15A and the outer middle wheel 17A.

On the other hand, the inner middle wheel 18A is
It is arranged on an eccentric axis O2-O2 which is eccentric by a fixed dimension δ in the radial direction with respect to the axis O1-O1 of A. Also,
The inner race 20A is positioned on the inner peripheral side of the inner middle race 18A by the sphere 19A, and is disposed on the eccentric axis O2-O2. Then, in this state, the sphere 19A is moved to the eccentric axis O2.
Roll around -O2.

Thus, the eccentric bearing 14A has the outer middle ring 1
7A and the inner middle wheel 18A rotate integrally with the rotating shaft 21 so that the inner ring 20A integrated with the turning shaft 22 makes a turning motion having a turning radius of dimension δ about the axis O1-O1. It is.

The second eccentric bearing 14B also
Outer ring 15B, sphere 16B, outer middle wheel 17B, inner middle wheel 1
8B, a sphere 19B and an inner ring 20B.

Numeral 21 is a rotating shaft provided on eccentric bearings 14A and 14B at both ends with the rotor 13 of the electric motor 11 interposed therebetween.
The rotating shaft 21 is formed as a hollow shaft body, and
And is fixedly provided by being inserted into the inner peripheral side of the rotor 13. The rotating shaft 21 is fixedly attached at both ends to the inner peripheral side of the outer middle wheel 17A and the outer peripheral side of the inner middle wheel 18A, respectively. This is for rotating the middle wheel 18A.

As shown in FIG. 3, the rotating shaft 21 has a thickness d1 at a portion opposite to the eccentric axis O2-O2 with respect to the axis O1-O1, and the eccentric axis O2-O2 side. Is defined as d1> d2. For this reason, the outer peripheral side of the rotating shaft 21 is the outer ring 15A,
On the other hand, the inner peripheral side is disposed on an eccentric axis O2 -O2 which is eccentric by a fixed dimension δ in the radial direction with respect to the axis O1 -O1.

Reference numeral 22 denotes a rotary shaft 21 which is provided so as to be loosely fitted therein.
A rotating shaft as a drive shaft fixedly supported by inner rings 20A, 20B of the eccentric bearings 14A, 14B;
Are formed as solid cylinders with eccentric axes O2-O2
Is placed on top. Further, both ends of the revolving shaft 22 are inserted and fixed to the inner peripheral sides of the inner rings 20A, 20B, and are rotatable inside the casing 1.

Here, mounting holes 23A and 23B, each of which is a circular hole having a bottom, to which the thrust receiving plate 24A is mounted are provided on both end surfaces of the turning shaft 22. Screw holes 23A1 and 23B1 are formed on the bottom side of the mounting holes 23A and 23B at positions substantially corresponding to the axes O1 -O1. Then, the orbiting shaft 22 orbits integrally with the inner races 20A and 20B by the rotation of the rotating shaft 21 to thereby move the orbiting scrolls 28A and 28B to the thrust receiving plate 24.
A and 24B are turned together.

Reference numeral 24A denotes a first thrust receiving plate which is located on the back side of the orbiting scroll 28A and is fixed to one end of the orbiting shaft 22 and forms a part of the orbiting shaft 22; The receiving plate 24A is composed of a disk portion 25A formed with an outer diameter larger than the turning shaft 22, and a stepped cylindrical fitting protrusion 26A protruding from the center of the rear surface of the disk portion 25A. It is configured.

The disk portion 25A of the thrust receiving plate 24A
On the outer peripheral side, arc-shaped projections 25A1 and 25A1 that are spaced apart in the circumferential direction and project in the radial direction are provided. The arc-shaped projection 25A1 has an accommodation hole 5 of the bearing mounting cylinder 5A.
Another accommodating hole 25A2 comprising a bottomed circular hole is provided at a position substantially corresponding to A1, and a bearing 37 described later is accommodated in the accommodating hole 25A2.

Further, the thrust receiving plate 24A has a bolt insertion hole 2 at a position substantially corresponding to the eccentric axis O2-O2.
4A1 is drilled. And thrust receiving plate 24A
In this state, the fitting projection 26A is fitted into the mounting hole 23A of the rotating shaft 22, and in this state, the fixing bolt 27A is inserted into the bolt inserting hole 24A1 from the front surface side of the disk portion 25A, thereby turning the rotating shaft 22A. Are fastened together in a detented state. Further, the thrust receiving plate 24A is provided with the orbiting scroll 28.
A comes into contact with the rear side of the end plate 29A of the
2 supports the thrust load F1 (see FIG. 1) acting on the orbiting scroll 28A at the end side.

Reference numeral 24B denotes a second thrust receiving plate which is located on the back side of the orbiting scroll 28B and is fixed to the other end of the orbiting shaft 22, and forms a part of the orbiting shaft 22. 24B is substantially the same as the thrust receiving plate 24A, and has a bolt insertion hole 24B1, a disk portion 25B, and a fitting projection 26B. Then, the thrust receiving plate 24B is fastened to the mounting hole 23B of the orbiting shaft 22 by the fixing bolt 27B, and the end plate 29B of the orbiting scroll 28B.
By contacting the rear side, the thrust load F2 acting on the orbiting scroll 28B at the end of the orbiting shaft 22 (FIG. 1)
See). Here, the thrust receiving plate 2
4B, an arc-shaped projection 2 provided on the thrust receiving plate 24A.
5A1 has been abolished.

28A, 28B are fixed scrolls 7A, 7
B, the first and second orbiting scrolls fixedly provided on both ends in the axial direction of the orbiting shaft 22 so as to face the first B.
Of the orbiting scroll 28A is a mirror plate 2 formed in a disk shape.
9A, and a spiral wrap portion 30A that stands in the axial direction from the front side of the end plate 29A. Further, an annular projection 31A extending substantially in a “C” shape along the circumferential direction is provided on the rear surface side of the end plate 29A of the orbiting scroll 28A.
Are integrally formed.

Further, a plurality of radiating fins 32A are formed on the end plate 29A.
Extend parallel to each other inside the end plate 29A. In the orbiting scroll 28A, an orbiting scroll side passage 46A to be described later is provided between the radiation fins 32A. The radiating fins 32A radiate compression heat and the like transmitted from the compression chamber 34A to the orbiting scroll 28A into the orbiting scroll side passage 46A.

The orbiting scroll 28A is positioned radially with respect to the thrust receiving plate 24A by fitting the annular projection 31A to the outer peripheral side of the thrust receiving plate 24A. The orbiting scroll 28A is provided with a head plate 29.
A is brought into contact with the thrust receiving plate 24A, and a plurality of fixing bolts 33A (see FIGS. 4 and 7) are attached to the end plate 2 in this state.
The thrust receiving plate 24A is inserted from the surface side of 9A.
It is integrally attached to.

As a result, the orbiting scroll 28A makes a revolving motion having a revolving radius of the dimension δ integrally with the revolving shaft 22. And the wrap portion 3 of the orbiting scroll 28A
0A is disposed so as to overlap with the wrap portion 9A of the fixed scroll 7A by, for example, 180 degrees, and a plurality of compression chambers 34A, 34A are provided between the wrap portions 9A and 30A.
34A,... Are defined.

During operation of the scroll air compressor, air is sucked into a compression chamber 34A on the outer peripheral side from a suction port 39A, which will be described later, and this air is supplied to the orbiting scroll 28A.
Compresses sequentially in each compression chamber 34A during the revolving motion, and finally discharges compressed air from the center compression chamber 34A to the outside through a discharge port 40A described later.

The second orbiting scroll 28B is also constituted by a head plate 29B, a wrap portion 30B, an annular projection 31B, a radiation fin 32B and the like. The orbiting scroll 28B is integrally attached to the thrust receiving plate 24B by the fixing bolt 33B, and defines a plurality of compression chambers 34B with the fixed scroll 7B.
Here, the orbiting scroll 28B is different from the orbiting scroll 28A in that an annular protrusion 31B is formed in an annular shape as shown in FIG.

Reference numerals 35 and 35 denote crankshafts as rotation preventing mechanisms provided between the bearing mounting cylinder 5A and the thrust receiving plate 24A. The crankshaft 35 accommodates the bearing mounting cylinder 5A as shown in FIG. One side shaft portion 35A rotatably supported by bearing 36 in hole 5A1, and thrust receiving plate 24A
And the other side shaft portion 35B rotatably supported by the bearing 37 in the accommodation hole 25A2.

The crankshaft 35 is connected to the other shaft portion 35.
B is eccentrically arranged by a dimension δ with respect to the one side shaft portion 35A, and these shaft portions 35A and 35B
The relative rotation within A1 and 25A2 prevents rotation of the orbiting scroll 28A integrated with the thrust receiving plate 24A.

Reference numerals 39A and 39B denote fixed scrolls 7A and 7B.
The first and second suction ports provided on the lid portions 3A and 3B of the casing 1 are located on the outer peripheral side of the wrap portions 9A and 9B of the casing B. Room 34A
The outside air is sucked into the compression chamber 34A from the opening 3A2 of the lid 3A. Further, the second suction port 39B is configured similarly to the suction port 39A.

Reference numerals 40A and 40B denote fixed scrolls 7A and 7B.
B located at the center side of the wrap portions 9A and 9B,
Outlets provided in the lids 3A and 3B of the
As for A, the base end side is opened inside the compression chamber 34A on the outermost circumference side, and the front end side penetrates a rear cover 44A described later and protrudes to the outside. The discharge port 40A discharges the compressed air in the compression chamber 34A to the outside. Further, the second discharge port 40B is configured in substantially the same manner as the discharge port 40A.

Reference numerals 41A and 41B denote first and second cooling fans provided in the casing 1 at positions where the suction ports 39A and 39B are opened. The first cooling fan 41A is a flat portion 3A1 of the lid 3A. A fan casing 42A fixedly attached to the fan casing 42A; a blade 43A rotatably provided in the fan casing 42A;
A is substantially constituted by a motor (not shown) provided at A and driving the blade portion 43A by an external power supply.

The fan casing 42A of the cooling fan 41A has an opening 3A2 of the lid 3A, a vent 3A3.
Further, it is arranged so as to cover the ventilation hole 44A1 of the rear cover 44A described later from the outside (upper side).

For this reason, the cooling fan 41A is
3A to the fixed scroll side passage 4
5A, a supply is provided to the back side of the fixed scroll 7A and the back side of the orbiting scroll 28A through the orbiting scroll side passage 46A. Also, the cooling fan 41A
Guides the outside air toward the suction port 39A side,
The periphery of the suction port 39A is cooled by cooling air, and
It also has the function of keeping the temperature of the air sucked into 9A low.

The second cooling fan 41B also has a fan casing 42 like the cooling fan 41A.
B, blades 43B and a motor (not shown).

Reference numerals 44A and 44B denote fixed scrolls 7A and 7B.
B provided on the casing 1 on the back side of
In the second back cover, the first back cover 44A is formed as a bottomed cylindrical body, and the opening end side thereof is fixedly attached to the lid 3A side of the casing 1 integrally. A substantially rectangular vent hole 44A1 (see FIG. 2) is formed on the upper side of the rear cover 44A, and another vent hole 44A2 substantially similar to the vent hole 44A1 is also formed on the lower side of the rear cover 44A. Have been. The ventilation holes 44A1 and 44A2 allow the cooling air from the cooling fan 41A to flow through the fixed scroll side passage 45A.

Further, the second rear cover 44B is configured in substantially the same manner as the rear cover 44A, and has a ventilation hole 44B.
1 and another vent hole 44B2.

.. Are fixed scrolls 7A.
, A plurality of first fixed scroll side passages 45B, 45B,...
Indicates a plurality of second fixed scroll-side passages provided on the back side of the fixed scroll 7B and provided between the radiation fins 4B.

Then, the first fixed scroll side passage 45
A extend parallel to each other along the upper and lower directions in the rear cover 44A. And the fixed scroll side passage 45A
Is the fixed scroll 7 for cooling air from the cooling fan 41A.
The fixed scroll 7A is supplied to the rear side of A and is cooled together with the lid 3A.

The second fixed scroll side passage 45B
Is configured similarly to the fixed scroll side passage 45A.

46A, 46A,...
A plurality of first orbiting scroll-side passages 46B, 46 provided between the radiation fins 32A and located on the back side of A.
B,... Indicate a plurality of second orbiting scroll-side passages located on the back side of the orbiting scroll 28B and provided between the radiation fins 32B.

Then, the first orbiting scroll side passage 46
A is formed as an elongated through-hole extending in parallel with each other through the inside of the end plate 29A of the orbiting scroll 28A, and supplies cooling air from the cooling fan 41A to the back side of the orbiting scroll 28A to cool the orbiting scroll 28A. Is what you do.

The second orbiting scroll side passage 46B
Are configured similarly to the orbiting scroll side passage 46A.

Reference numerals 47, 47 denote a plurality of other radiating fins provided on the outer peripheral side of the cylindrical portion 2 of the casing 1 at intervals in the axial direction.

The scroll-type air compressor according to the present embodiment has the above-described configuration, and its operation will be described next.

First, when the rotor 13 of the electric motor 11 is rotated, the rotating shaft 21 integrated with the rotor 13 rotates by the spheres 16A and 16B of the eccentric bearings 14A and 14B. Spheres 19A, 19B
As a result, it rotates on the inner peripheral side of the rotating shaft 21.

Here, the spheres 16A and 16B rotate about the axis O1-O1 of the casing 1 (outer rings 15A and 15B), while the spheres 19A and 19B move radially with respect to the axis O1-O1. Since the rotation is made about the eccentric axis O2-O2 eccentric by the dimension δ, the spherical bodies 19A, 1
Turning shaft 2 integrated with inner rings 20A, 20B by 9B
Reference numeral 2 indicates a revolving motion having a revolving radius of dimension .delta. Around the axis O1-O1, and the revolving scrolls 28A and 28B are revolved by the revolving shaft 22, respectively.

The orbiting scroll 28
When A and 28B orbit, orbiting scrolls 28A and 28A
28B is prevented from rotating by the crankshaft 35, and performs only revolution.

As a result, each of the compression chambers 34A defined between the fixed scroll 7A and the orbiting scroll 28A is continuously reduced, so that the outside air sucked from the suction port 39A of the fixed scroll 7A is compressed. The compressed air is stored in an external air tank (not shown) from the discharge port 40A of the fixed scroll 7A while being sequentially compressed at 34A.

Also, the compression chambers 34B defined between the fixed scroll 7B and the orbiting scroll 28B are continuously reduced to store compressed air in the air tank or the like.

Here, in the present embodiment, the cooling fan 4
1A, the fixed scroll 7A and the orbiting scroll 28
A is attached to the outer peripheral side of the lid 3A of the casing 1 in which the cooling air is accommodated.
3 and 8, the cooling air can be directly supplied to the back side of the fixed scroll 7A through the fixed scroll side passage 45A as shown by an arrow A in FIG. 3 and FIG.
As described above, the air can be supplied directly to the back side of the orbiting scroll 28A through the orbiting scroll side passage 46A.

Similarly, cooling air from the cooling fan 41B is also passed through the fixed scroll side passage 45B and the orbiting scroll side passage 46B.
B and the back side of the orbiting scroll 28B.

Thus, in the present embodiment, the cooling air from cooling fans 41A and 41B is supplied to fixed scrolls 7A and 7B.
It is not necessary to use a duct or the like as described in the related art in order to guide to the B side and the orbiting scrolls 28A and 28B side, and it is possible to minimize the pressure loss of the cooling air.

Therefore, during the compression operation, the cooling fan 41
A, 41B allows the fixed scrolls 7A, 7B and the orbiting scrolls 28A, 28B to be efficiently cooled, and reduces the thermal expansion of the wrap portions 9A, 9B, 30A, 30B to increase the degree of sealing in the compression chambers 34A, 34B. Compression efficiency can be increased. Then, breakage due to contact between the wrap portions 9A and 9B and the wrap portions 30A and 30B can be eliminated, and the performance, reliability, and the like of the air compressor can be improved.

In this embodiment, the cooling fan 4
1A and 41B, the suction ports 39A and 3
9B is arranged at a position where the opening is opened, so that during the compression operation, external air can be smoothly guided from the suction ports 39A, 39B into the compression chambers 34A, 34B by using the cooling fans 41A, 41B. Compression efficiency can be improved.

The cooling air from the cooling fans 41A and 41B can cool the surroundings of the suction ports 39A and 39B, so that the compression chambers 34A and 34B can be cooled through the suction ports 39A and 39B.
The temperature of the air sucked into B can be kept low, which can also increase the compression efficiency of the air compressor.

In this embodiment, thrust receiving plates 24A and 24B having an outer diameter larger than that of the turning shaft 22 are fixedly provided at both ends of the turning shaft 22, and the thrust receiving plates 24A and 24B are fixed to the thrust receiving plates 24A and 24B. Since the orbiting scrolls 28A and 28B are fixedly mounted, the orbiting scroll 28
The thrust receiving plates 24A, 24B can be brought into contact with the end plates 29A, 29B of A, 28B from the back side thereof with a wide contact area, and the thrust loads F1, F2 acting on the orbiting scrolls 28A, 28B can be received by the thrust receiving plates. 24
A and 24B can be dispersed and supported on the entire disk portions 25A and 25B.

Thus, the orbiting scrolls 28A, 28
B can stabilize the behavior, and the orbiting scroll 2
The wrap portions 30A and 30B of the fixed scrolls 7A and 7B do not interfere with the wrap portions 9A and 9B of the fixed scrolls 7A and 7B, thereby preventing wear of the wrap portions 9A, 9B, 30A and 30B and reducing noise. The performance and reliability of the air compressor can be improved.

Further, in order to prevent the orbiting scroll 28A from rotating, one side shaft portion 35A of the crankshaft 35 is rotatably provided in the housing hole 5A1 of the bearing mounting cylinder 5A via a bearing 36, and the other side shaft portion is provided. 35B is provided rotatably in the receiving hole 25A2 of the thrust receiving plate 24A via the bearing 37, so that the bearings 36 and 37 can prevent the crankshaft 35 from rattling in the receiving holes 5A1 and 25A2.
The behavior of the orbiting scrolls 28A, 28B can be further stabilized.

In the above embodiment, the case where the middle wheel used for the eccentric bearing 14A is composed of two members, the outer middle wheel 17A and the inner middle wheel 18A, has been described as an example. As in the first modified example shown in FIG. 10, the eccentric bearing 51A is formed integrally with the outer middle wheel 17A and the inner middle wheel 18A according to the embodiment, so that the middle wheel 54A is formed by one member. You may.

Here, the eccentric bearing 51A is connected to the outer ring 52A.
And a sphere 53 serving as an outer rolling element on the inner peripheral side of the outer ring 52A.
A is provided rotatably by A and is fitted and fixed to the end of the rotating shaft 21 and a rotating shaft rotatably provided by a sphere 55A serving as an inner rolling element on the inner peripheral side of the middle wheel 54A. The inner ring 56A is fixed to the outer peripheral side of the inner ring 22.

In the embodiment, the thrust receiving plate 24
A circular projection 25A1 is provided on the outer peripheral side of the disk portion 25A of A,
Although the case where the accommodating hole 25A2 is provided in the arc-shaped protruding portion 25A1 has been described as an example, instead of this, for example, FIG.
As in the second modification shown in FIG. 7, the circular projection 25A of the embodiment is formed from the disk portion 25A 'of the thrust receiving plate 24A'.
1 is abolished, and the disk portion 25A 'is formed to have a larger diameter than the disk portion 25A according to the embodiment.
A configuration may be adopted in which the accommodation holes 25A2 'and 25A2' are provided in A '.

Here, the thrust receiving plate 24A 'has a bolt insertion hole 24A1', a disk portion 25A ', a receiving hole 25A2' and a fitting projection 26A 'in substantially the same manner as the thrust receiving plate 24A according to the embodiment. Have.

In the embodiment, the thrust receiving plates 24A and 24B are provided at both ends of the orbiting shaft 22, and the orbiting scrolls 28A and 28B are provided on the thrust receiving plates 24A and 24B. However, instead of this, the thrust receiving plates 24A and 24B according to the embodiment are abolished, as in a third modified example shown in FIG.
First and second orbiting scrolls 2 at both ends of the orbiting shaft 22 '
8A 'and 28B' may be directly fitted and fixed.

Here, the orbiting scrolls 28A ', 28
B 'is the orbiting scroll 28A, 28 according to the embodiment.
B, the end plates 29A 'and 29B', the wrap portion 3
0A ', 30B' and radiation fins 32A ', 32B'
And so on. And the orbiting scroll 2
8A 'is prevented from rotating by, for example, an Oldham ring 61 provided between itself and the bearing mounting cylinder 5A.

Further, in the embodiment, two orbiting scrolls 28A and 28B are provided on both ends of the orbiting shaft 22, and two orbiting scrolls 28A and 28B are provided on both sides of the casing 1 in two fixed scrolls 7A. , 7B has been described as an example, but the present invention is not limited to this. For example, the fixed scroll 7A and the orbiting scroll 28A are abolished, and the fixed scroll 7B is removed. And the orbiting scroll 28B alone may constitute a scroll air compressor.

Further, in the embodiment, the thrust receiving plate 2
4A and 24B, the fitting projections 26A and 26B are fitted to the mounting holes 23A and 23B recessed at both ends of the revolving shaft 22, for example. Alternatively, for example, the mounting hole is recessed on the thrust receiving plate side, fitting projections are protruded at both ends of the turning shaft, and the thrust receiving plate is turned by fitting the fitting projections into the mounting holes. It may be configured to be attached to a shaft.

Further, in the embodiment, a description will be given of a scroll type fluid machine in which the rotary shaft and the orbiting shaft are respectively mounted on eccentric bearings so that the orbiting scroll provided integrally with the orbiting shaft is orbited. However, the present invention is not limited to this. For example, a general scroll in which a drive shaft having a crankshaft end is rotatably provided on a casing, and a orbiting scroll is provided on the crankshaft of the drive shaft via a orbit bearing. The present invention is also applicable to a fluid machine.

On the other hand, in the embodiment, a scroll type air compressor has been described as an example of a scroll type fluid machine, but the present invention is not limited to this, and can be widely applied to, for example, a refrigerant compressor. .

[0086]

As described in detail above, according to the first aspect of the present invention, the cooling fan is provided on the outer peripheral side of the fixed member.
Since the cooling air from the cooling fan is supplied to the rear side of the fixed scroll and the rear side of the orbiting scroll, the cooling air from the cooling fan is supplied to the rear side of the fixed scroll and the rear side of the orbiting scroll. The supply can be directly performed from the outer peripheral side of the fixed side member without using a duct or the like as described in the related art, and the pressure loss of the cooling air can be minimized.

For this reason, during the compression operation, the fixed scroll and the orbiting scroll can be efficiently cooled from the back side by the cooling fan, the thermal expansion of the wrap portions is suppressed to a small extent, and the damage due to the contact between the wrap portions is eliminated, and Life, performance, etc. can be improved.

Further, according to the second aspect of the present invention, a fluid suction port is provided on the outer peripheral side of the fixed side member, and the cooling fan is arranged at a position where the suction port is opened. Can be smoothly guided from the suction port into the compression chamber using the cooling fan, and the compression efficiency can be increased. Further, since the surroundings of the suction port can be cooled by the cooling air from the cooling fan, the temperature of the fluid sucked into the compression chamber from the suction port can be kept low, thereby also increasing the compression efficiency of the fluid machine. Can be.

Further, according to a third aspect of the present invention, a fixed scroll side passage for supplying cooling air from a cooling fan is provided on the back side of the fixed scroll, and cooling air from the cooling fan is provided on the back side of the orbiting scroll. Since the orbiting scroll side passage to be supplied is provided, the cooling air from the cooling fan can be smoothly circulated along the fixed scroll side passage and the orbiting scroll side passage, and the fixed scroll and the orbiting scroll can be more efficiently used. Can be cooled.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the scroll-type air compressor according to the embodiment as viewed from the direction of arrows II-II in FIG.

FIG. 3 is a partially enlarged sectional view showing a fixed scroll, an orbiting scroll, an eccentric bearing, a cooling fan, and the like in FIG. 1 in an enlarged manner.

FIG. 4 is a cross-sectional view of the casing, the first thrust receiving plate, the crankshaft, and the like, as viewed from the direction of arrows IV-IV in FIG.

FIG. 5 is a rear view of the first thrust receiving plate in FIG. 1 viewed from the rear side alone.

FIG. 6 is a cross-sectional view of the casing, the second thrust receiving plate, and the like as viewed from the direction of arrows VI-VI in FIG.

FIG. 7 shows a casing, a first orbiting scroll, and a first orbiting scroll.
FIG. 7 is a cross-sectional view of the orbiting scroll side passage and the like viewed from the direction of arrows VII-VII in FIG. 1.

FIG. 8 is a cross-sectional view of the back cover, the first fixed scroll side passage, and the like, as viewed from the direction of arrows VIII-VIII in FIG.

9 is an exploded cross-sectional view showing the orbital shaft, the first thrust receiving plate, and the first orbiting scroll in FIG. 1 in an exploded manner.

FIG. 10 is a cross-sectional view of a fixed scroll, an orbiting scroll, an eccentric bearing, a cooling fan, and the like according to a first modification of the present invention, as viewed from the same position as in FIG. 3;

FIG. 11 is a rear view of a first thrust receiving plate according to a second modified example of the present invention viewed from the rear side alone.

FIG. 12 is a longitudinal sectional view showing a scroll type air compressor according to a third modification of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Casing (fixed side member) 5A, 5B Bearing mounting cylinder 7A, 7B Fixed scroll 8A, 8B, 29A, 29A ', 29B, 29B' End plate 9A, 9B, 30A, 30A ', 30B, 30B' Lapping part 11 Motor 12 Stator 13 Rotor 14A, 14B, 51A Eccentric bearing 16A, 16B, 53A Spherical body (outer rolling element) 19A, 19B, 55A Spherical body (inner rolling element) 21 Rotation axis 22, 22 'Swing axis (drive axis) 28A, 28A', 28B, 28B 'Orbiting scroll 34A, 34B Compression chamber 39A, 39B Suction port 41A, 41B Cooling fan 45A, 45B Fixed scroll side passage 46A, 46B Orbiting scroll side passage

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H029 AA02 AA15 AA23 AB03 AB08 BB12 BB32 CC04 CC09 CC47 3H039 AA02 AA05 AA10 AA14 BB13 CC33 CC49

Claims (3)

[Claims] 1. A fixed-side member comprising a casing, a fixed scroll provided on the casing, and a spiral wrap portion provided upright on a head plate, a drive shaft rotatably provided on the casing, and a casing inside the casing. A scrolling fluid machine comprising: a revolving scroll provided rotatably at the tip end side of the drive shaft; The scroll fluid machine according to claim 1, wherein a cooling fan for supplying cooling air to a rear side of the fixed scroll and a rear side of the orbiting scroll is provided on an outer peripheral side of the fixed side member. 2. The cooling fan according to claim 1, wherein a suction port for sucking a fluid into the compression chamber is provided on an outer peripheral side of the fixed side member, and the cooling fan is arranged at a position where the suction port is opened. Scroll type fluid machine. 3. A fixed scroll side passage for supplying cooling air from the cooling fan is provided on a back side of the fixed scroll, and a turning scroll for supplying cooling air from the cooling fan is provided on a back side of the turning scroll. The scroll-type fluid machine according to claim 1, further comprising a side passage.