JP2003065271A - Oil-free scroll fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heating of a bearing part in a scroll fluid machinery. SOLUTION: A connecting board 32 provided with a driving bearing 40 is fixed to a panel board 24 of a turning scroll 4 with an insulating material 34 interposed, and a crank part 29 of a driving shaft 13 is supported by this driving bearing 40 to constitute the connecting body and the turning scroll 4 integrally in capable of a turning motion. To this connecting board 32, a bearing 38 can be provided for rotatably supporting one end of a crank shaft 37 which prevents rotation of the turning scroll 4 by connecting the connecting board 32 to an inner wall of a casing 5, and the driving shaft 13 is inserted into a shaft hole 28 of the turning scroll 4 so that a predetermined interval is formed between an inner circumferential face of the shaft hole 28 and an outer circumferential face of the driving shaft 13. By this, heat of the turning scroll 4 is not directly transmitted to the turning bearing 40 or the bearing 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil-free scroll fluid machine which prevents heat transfer between members in a scroll fluid machine used for air compressors, gas compressors and vacuum pumps.

[0002]

2. Description of the Related Art In a conventional oil-free scroll fluid machine, as shown in FIG. 2, a scroll wrap 10 of an orbiting scroll 104 is attached to a scroll scroll wrap 103 protruding from one end plate 102 of a fixed scroll 101.
5, the working fluid is compressed by meshing with each other, and the compressed working fluid is formed in the central portion of the fixed scroll 101.
6 is configured so as to be pressure-fed to the consumer side (Japanese Patent Laid-Open No. 2-212058).
000-205156).

In the oil-free scroll fluid machine, each scroll wrap 1 forms a compression action space 107 by the compression heat generated by the compression action of the action fluid.
03, 105 and a casing main body 108 for accommodating the scroll, and main bearings 110 and 111 for supporting the drive shaft 109, a slewing bearing 112, a rotation preventing mechanism bearing 113, and the like, are constantly exposed to high temperatures to operate. is doing.

Of these, the end plate 114 of the orbiting scroll, which is particularly adjacent to the compression space 107, has a high temperature due to the reception of the compression heat. By doing so, the compression action space is indirectly cooled, and at the same time, each part in the machine is cooled.

[0005]

[Problems to be solved by the invention] Conventional oil-free
In the case of the scroll fluid machine, the orbiting bearing 112 is provided on the connecting plate 116 arranged at a predetermined distance from the end plate 114 of the orbiting scroll 104, but the heat of the orbiting scroll 104 heated by the transfer of the compression heat is , The radiation fin 115 and the connecting portion 117 of the connecting plate
Since the heat is directly transferred to the connecting plate 116 via the connecting plate 116, the connecting plate 116 gradually becomes hot.

Therefore, the slewing bearing 112 and the rotation preventing mechanism bearing 113 provided on the connecting plate 116 have a much higher temperature than the other bearings 110 and 111.

Generally, in the case of an oil-free scroll fluid machine, it is usual to use a lubricant-filled bearing in which a lubricant such as grease is filled in each bearing, so that the bearing portion is exposed to a high temperature for a long period of time. If the lubricant is gradually deteriorated when it is continuously operated at, or the bearing seal member that seals and holds the lubricant deteriorates and the lubricant enclosed inside leaks out, the durability of the bearing decreases. Further, this has also been a cause of causing abnormal wear of the sliding parts.

Therefore, the present invention has been made in order to solve the above-mentioned drawbacks of the prior art, and the heat generated during the compression of the working fluid is applied to the orbiting bearing and the bearing of the rotation preventing mechanism via the orbiting scroll. It is possible to prevent deterioration of the bearing durability due to deterioration of the lubricant of the bearing and deterioration of the bearing seal member, etc., and abnormal wear of the sliding parts due to this, by providing a configuration that can prevent direct transmission Another object of the present invention is to provide an oil-free scroll fluid machine that can prevent the occurrence of other adverse effects.

[0009]

In order to solve the above problems, the oil-free scroll fluid machine of the present invention is
The scroll wrap 19 of the fixed scroll 2 fixed to the casing 5, and the scroll wrap 2 of the orbiting scroll 4 meshing with the scroll wrap 19 of the fixed scroll 2.
In the scroll fluid machine, the drive shaft 13 is inserted through the respective central portions of the drive shafts 5, and both ends of the drive shaft are supported by the casing 5 and the fixed scroll 2.
A main bearing 2 which is formed at a substantially central position in the longitudinal direction of the drive shaft and is formed with a crank portion 29 which is eccentric to the shaft center of the both end portions and which is provided on the end wall 20 of the casing 5, respectively.
2 and a bearing 14 provided on the fixed scroll 2, and faces the side surface of the orbiting scroll 4 on the side opposite to the surface on which the scroll wrap 25 of the orbiting scroll 24 stands, to form a connecting body (connecting plate 32). ) Are arranged at a predetermined interval, the connecting body is integrally fixed to the orbiting scroll 4, and the orbiting bearing 40 provided in the central portion of the connecting body is supported by the crank portion 29 of the drive shaft 13 and The connecting body and the orbiting scroll 4 can be integrally orbitally moved, and the connecting portion 33 between the orbiting scroll 4 and the connecting body is formed.
The heat insulating material 34 is interposed between the two (claim 1).

A bearing 38 for an anti-rotation mechanism is rotatably supported on one end of a crankshaft 37 for preventing rotation of the orbiting scroll 4 by connecting the connecting body and the inner wall of the casing 5 to the connecting body. It can be provided (Claim 2).

Further, a shaft hole 28 through which the drive shaft 13 is inserted is provided at the center of the scroll wrap 25 of the orbiting scroll 4, and a predetermined distance is provided between the inner peripheral surface of the shaft hole 28 and the outer peripheral surface of the drive shaft 13. It is characterized in that a space is formed (Claim 3).

[0012]

DETAILED DESCRIPTION OF THE INVENTION An embodiment of the present invention will be described below with reference to FIG.

The oil-free scroll fluid machine of the present invention (hereinafter simply referred to as a scroll fluid machine) accommodates the orbiting scroll 4 in a casing 5 having an opening at one end and an end wall 20 at the other end, and the opening is provided. The flange portion 6 formed on the peripheral edge of the fixed scroll 2 and the peripheral portion of the fixed scroll 2 are integrally connected by a fastening member 7a such as a bolt and a positioning knock pin.
Is attached.

In the present embodiment, the one end opening of the casing 5 has a shape that is partially covered by the peripheral edge of the fixed scroll 2 and the peripheral edge of the fixed scroll 2.
An air guide port for introducing cooling air is formed in the casing 5 with a gap formed between the peripheral edges of the one end opening of the casing 5.

Further, in the present embodiment, an intake port 9 for the working fluid A is opened in the outer wall 8 formed at the outer periphery of the fixed scroll 2, and the inside of the outer wall 8 is for inhaling a scroll wrap described later. An intake passage 10 for the working fluid that communicates with the mouth is formed.

Further, a through hole 12 is formed in a center boss 11 formed in the central portion of the end plate 3 of the fixed scroll 2, and one of the drive shafts 13 is inserted through the through hole with a slight gap. However, it is supported by a bearing 14 fitted to the outer end thereof. A shaft sealing means 15 is provided near the orbiting scroll of the through hole 12, and seals a gap between the through hole 12 and the drive shaft 13 formed on both sides of the shaft sealing means.

An axial flow type cooling fan 16 is fixed to one end of the drive shaft 13, and the end plate 3 of the fixed scroll is provided between the peripheral edge of the cooling fan 16 and the outer wall 8 of the fixed scroll. A cooling air guide duct 18 is detachably provided so as to cover the projecting radiating fins 17 and the bearing 14, and an inner side thereof forms a cooling air guide passage.

A plurality of radiating fins 17 are provided on the end plate 3 of the fixed scroll with a space at an appropriate interval so as to project. The space between the radiating fins is formed in a substantially concave shape to form a ventilation passage for cooling air. At the same time, a fixed scroll wrap 19 which is continuous with the center boss 11 and stands upright at a right angle to the mirror plate 3 and which is formed in a spiral shape is provided on the opposite surface sandwiching the mirror plate 3.

On the other hand, a bearing box 21 is provided at the center of the end wall 20 formed on the side opposite to the flange portion 6 of the casing that is coupled to the fixed scroll 2, and the main bearing 22 is fitted therein and the main bearing 22 is fitted therein. The other end is supported, and a pulley 23, which is a power transmission means for transmitting power from a drive motor (motor or engine) (not shown) via a V-belt, is fixed to the shaft end thereof.

Further, one end plate 24 of the orbiting scroll 4 arranged in the casing 5 is provided with a spiral orbiting scroll wrap 25 standing upright at a right angle to the end plate, which is formed on the fixed scroll 2. Scroll wrap 1
The compression action space 26 is formed by meshing with a small gap that does not interfere with 9.

Further, a boss 27 is provided on the side opposite to the surface on which the scroll wrap 25 is erected with the end plate 24 sandwiched in the central portion of the scroll wrap 25 of the orbiting scroll, and with respect to the shaft hole 28 bored in the boss. A crank portion 29, which is an eccentric shaft portion of the drive shaft 13, is inserted. In addition, this bearing 14
As the main bearing 22, a lubricant-filled bearing in which grease or other lubricant is filled in the bearing is used.

Further, on the side opposite to the surface on which the orbiting scroll wrap 25 sandwiching the end plate 24 is erected, radiating fins 31 are projected from the peripheral edge of the boss 27 and the outer peripheral edge thereof with a space at an appropriate interval. A substantially concave cooling air passage (not shown) is formed between the fins.

Further, a connecting portion 33 is projected on the side opposite to the surface on which the orbiting scroll wrap 25 is erected so as to sandwich the end plate 24, and a connecting plate 32, which is a connecting body, is arranged in the tip direction of the connecting portion 33. A heat insulating material 34 is sandwiched between the connecting portion 33 and the connecting plate 32, and a fastening member 7a such as a bolt is provided therebetween.
The end plate 24 of the orbiting scroll 4 and the connecting plate 32 are integrally fixed at a predetermined interval, and the heat from the end plate 24 of the orbiting scroll 4 is directly applied to the orbiting bearing 40 provided in the central portion of the connecting plate 32. It is configured not to be transmitted.

This connecting member is used for the end plate 2 of the orbiting scroll 4.
4 may have any shape as long as the slewing bearing 40 can be arranged at a predetermined interval, but in the present embodiment, a plate-like coupling body in which the slewing bearing 40 is provided in the central portion (this specification) The term "connecting plate" is used in the book.

The coupling plate 32 is preferably provided with rotation preventing mechanism bearings 38 at a plurality of positions in the peripheral portion thereof, and the crank shaft 37 is provided by the rotation preventing mechanism bearings 38.
Of the bearing 3 formed on the inner wall surface of the end wall 20 of the casing 5 while supporting the other end of the crankshaft 38.
A rotation preventing mechanism 36 is rotatably supported by 6 to prevent the connecting plate 32 and the orbiting scroll 4 from rotating, and at the same time, can rotate around the axis 45 of the drive shaft 13.

The heat insulating material 34 shields between the connecting plates 32 the high-temperature transfer heat transferred from the end plate 24 of the orbiting scroll adjacent to the compression space 26 via the radiation fins 31 and the connecting portions 33 of the connecting plates. It prevents the transmission of high-temperature heat to the connecting plate side, and various known materials can be used for the material. As an example, a heat insulating resin,
Wood, paper or leather pressboard products, non-asbestos,
A heat resistant material that can withstand high temperatures for a long period of time such as reinforced glass fiber is used.

Further, in order to make the heat of the orbiting scroll 4 less likely to be transferred to the orbiting bearing 40, the inner peripheral surface of the shaft hole 28 formed in the orbiting scroll 4 and the shaft hole 28 are inserted into the shaft hole 28. A slight gap is provided between the outer peripheral surface of the crank portion 29 of the drive shaft 13 and the heat of the orbiting scroll 4 is prevented from being directly transferred to the drive shaft 13. By thus preventing the heat transfer of the orbiting scroll 4 to the drive shaft 13, the drive shaft 1
The heat of the orbiting scroll 4 is prevented from being transferred to the orbiting bearing 40 via 3.

When a slight gap is provided between the inner peripheral surface of the shaft hole 28 and the outer peripheral surface of the crank portion 29 of the drive shaft 13 as described above, the compressed fluid in the compression working space is passed through this gap. It is preferable to provide a shaft sealing means 30 for preventing the oil from leaking.

The connecting plate 32 includes a crank 37 of a rotation preventing mechanism 36 provided on the end wall of the casing 5 and the rotation preventing bearing 3.
8 and a swivel bearing 40 fitted in a second bearing box 39 provided at the center of the swivel scroll 8 and the swivel scroll 4 are rotatably supported on the crank 29. A plurality of openings 41 are formed in the peripheral edge of the second bearing box and serve as a flow passage for the cooling air passing between the radiation fins 31 of the orbiting scroll.

The crank portion 29 has a shaft center 45 of the drive shaft 13.
Is formed eccentrically with respect to the dimension e and is integrally formed with the drive shaft. When the drive shaft 13 is rotated by the operation of a drive motor (not shown), the connecting plate 32 and the orbiting scroll 4 are integrally formed with the shaft center 45. The orbital motion is performed with the eccentric dimension e as the radius. With this orbital motion, the orbiting scroll 4
Apparently cooperates with the rotation prevention mechanism 36 to apparently have the axis 4 of the drive shaft.
A turning motion with a radius e centered at 5 is performed.

A balance weight 46 is integrally provided on the drive shaft 13 between the crank portion 29 and the main bearing 22 fitted in the casing 5, and the balance weight and one of the drive shaft 13 are provided. A second shaft is provided on the drive shaft 13 between the cooling fan 16 provided at the shaft end and the fixed scroll 2.
The balance weight 46b and the third balance weight 46c integral with the pulley 23 provided at the other shaft end of the drive shaft 13 cause the rotation of the drive shaft 13 and the orbiting motion of the orbiting scroll 4 accompanying the rotation. The centrifugal force is offset to suppress the generation of vibration and the whirling phenomenon of the orbiting scroll accompanying the orbiting motion as small as possible.

An air guide path 49 for cooling air communicating with the above-mentioned air guide port is formed in the space between the inner peripheral surface of the casing 5 and the outer peripheral edges of the orbiting scroll 4 and the connecting plate 32, and the end plate 24 of the orbiting scroll is formed. Connecting portion 33 with the connecting plate protruding from
And a through hole 41 that communicates with the concave space formed between the heat dissipation fins 31 and that is open to the periphery of the bearing box 39 of the connecting plate.
It also communicates with.

Therefore, the orbiting scroll 4 and the connecting plate 32 form a passage for the cooling air passing through the inside of the machine in the air guide passage 49.

An air flow direction plate 51 is formed on the casing 5 so as to project from the inner wall surface thereof toward the drive shaft 13. The tip end of the air flow direction plate 51 in the direction of projection is the orbiting scroll 4 of the connecting plate 32. It is arranged close to the side opposite to the side.

An exhaust port 52 for exhausting the cooling air introduced into the casing 5 is formed on the wall surface of the casing 5 from the position where the air flow direction plate 51 projects to the outer periphery of the main bearing 22. 5 is formed so as to penetrate the wall surface.

In the wind direction plate 51 thus formed, the cooling air introduced into the air guiding passage 49 through the above-mentioned air guiding port becomes an obstacle when it directly goes to the air exhaust port 52, and the cooling air flows. It is prevented that the air is directly discharged to the outside of the machine through the air outlet 52 without passing between the end plate 24 and the connecting plate 32.

Therefore, the cooling air B introduced from the above-mentioned air guide port has the air guide passage 4 formed on the inner peripheral edge of the casing.
After colliding with the outer peripheral edge of the connecting plate 32 and the wind direction plate 51 via 9, the groove is introduced into the space between the end plate 24 and the connecting plate 32 of the orbiting scroll and guided in the direction of the boss 27 to form the concave shape of the heat radiation fin 31 of the orbiting scroll 4. Cool each part through the space.

After that, it bypasses in the wall surface direction of the connecting plate 32, passes through the passage 41, and is discharged to the outside from the air outlet 52 opening to the casing end wall 20.

Next, the operation of the present invention will be described. The pulley 23 fixed to the end of the drive shaft on the casing 5 side is connected to a drive prime mover (not shown) such as a motor or an engine by a power transmission means of a V-belt, and when the drive shaft 13 is rotated by the operation of the drive prime mover, The crank portion 29 of the drive shaft revolves around the shaft center 45.

Along with this revolving movement, the connecting plate 32 supported on the crank portion 29 and the orbiting scroll 4 are integrally united to perform the orbiting movement around the axis 45, and after the working fluid A is sucked from the intake port 9. , And flows into the compression space 26 formed between the fixed scroll wrap 18 and the orbiting scroll wrap 25 via the intake passage 10. After that, the scroll wraps 1 are gradually contracted in volume in the compression action space.
After continuously moving toward the center of 9, 25 and performing an efficient compressing action, it is discharged from a discharge port 47 formed near the center of the end plate 3 of the fixed scroll 2 and supplied to the consumer side.

On the other hand, the cooling air B blown by the cooling fan 16 passes through the concave space formed between the heat dissipating fins 17 of the fixed scroll to cool the heat dissipating fins and the bearings 14, and then to the peripheral edge of the end plate 3 of the fixed scroll. The outer peripheral edge and the wind direction of the connecting plate that protrudes outward from the outer periphery of the orbiting scroll 4 through an air guide passage 49 formed on the inner peripheral surface of the casing from an air guide port formed between the peripheral edges of the one end opening of the casing 5. After colliding with the plate 51, the circular plate 24 of the orbiting scroll and the boss 27 are detoured / deflected to pass through the concave space of the heat radiation fin 31 of the orbiting scroll to pass through the mirror plate 24, the heat radiation fin 31, and the connecting plate 32 of the orbiting scroll. The wall surface 35, the second bearing box 39, etc. are evenly cooled. Then, the gas passes through the through-hole 41 opening to the wall surface 35 of the connecting plate and is discharged to the outside from the air outlet 52 of the casing end wall 20.

In this way, the cooling air blown into the inside of the machine by the cooling fan 16 passes through the above-mentioned air guide port toward the exhaust air outlet 52 opening in the end wall of the casing to cool each part of the inside of the machine. The end plate 24 of the orbiting scroll and the wall surface 35 of the connecting plate 32, which have the highest temperature, are preferably cooled.

On the other hand, the compression heat generated by the compression action of the working fluid is transmitted to the end plate 3 of the fixed scroll and the end plate 24 of the orbiting scroll to raise the temperature of the end plate. Then, the compressed working fluid is indirectly cooled by radiating heat by the cooling air passing between the radiating fins 17 and 31 projecting from the end plate.

Of these, the heat transferred to the joint 33 with the connecting plate 32 and the radiation fins 31 through the end plate 24 of the orbiting scroll is transferred by the heat insulating material 34 sandwiched in the joint 33 with the connecting plate. Since it is shielded, heat transfer to the connecting plate 32 side is blocked.

The heat transferred from the end plate 24 of the orbiting scroll to the connecting plate 32 via the drive shaft 13 is the outer periphery of the crank portion 29 of the drive shaft 13 and the shaft hole 2 of the orbiting scroll.
Since it is shielded by the gap formed between the inner peripheries of the eight plates, heat transfer to the connecting plate 32 side is blocked.

As described above, the connecting plate 32 is cooled by the cooling air passing through the inside of the machine and is shielded from the transferred heat by the heat insulating material 34 or the like sandwiched in the joint portion 33 with the orbiting scroll. Bearing 40 and rotation preventing bearing 3
8 will operate under suitable conditions without any thermal effects.

[0047]

As described above, according to the present invention, the compression heat generated by the compression action of the working fluid is obtained by connecting the rotating school and the connecting body (connecting plate) having the rotating bearing through the heat insulating material. Can be prevented from being directly transmitted to the slewing bearing, and deterioration of the bearing durability due to deterioration of the lubricant of the bearing and deterioration of the bearing seal member can be prevented, and the sliding parts It was possible to provide an oil-free scroll fluid machine capable of preventing abnormal wear and other adverse effects.

Further, when a bearing which constitutes a rotation preventing mechanism is provided on the connecting body (connecting plate), it is possible to prevent deterioration of durability of the bearing as well.

Further, there is an oil-free scroll fluid machine in which a slight gap is provided between the inner peripheral surface of the shaft hole formed in the central portion of the orbiting scroll and the outer peripheral surface of the drive shaft inserted in this shaft hole. As a result, it was possible to prevent the heat generated in the orbiting scroll from being transferred to the orbiting bearing via the drive shaft.

[Brief description of drawings]

FIG. 1 is a sectional view of an oil-free scroll fluid machine of the present invention.

FIG. 2 is a cross-sectional view of a conventional oil-free scroll fluid machine.

[Explanation of symbols]

1 Fluid machine body 2 fixed scroll 3 End plate 4 orbiting scroll 5 casing 11 Center Boss 12 through holes 13 Drive axis 14 bearings 16 cooling fan 19 Fixed scroll wrap 22 Main bearing 24 End plate 25 Orbiting scroll wrap 26 compression space 29 Crank part 31 radiating fins 32 connecting plate 33 Connection 34 Insulation 40 slewing bearing 45 Drive shaft axis core

Continued front page    F-term (reference) 3H029 AA02 AA17 AA24 AB02 AB06                       BB14 BB44 CC01 CC02 CC08                       CC09 CC16 CC17 CC20 CC38                       CC47                 3H039 AA02 AA09 AA11 AA12 BB04                       BB14 CC02 CC03 CC08 CC09                       CC12 CC13 CC17 CC19 CC31                       CC33 CC35 CC49

Claims (3)

[Claims] 1. A drive shaft is inserted through the respective central portions of a scroll wrap of a fixed scroll fixed to a casing and a scroll wrap of an orbiting scroll that meshes with the scroll wrap of the fixed scroll, and the casing and the fixed scroll have the above-mentioned structure. In a scroll fluid machine supporting both end portions of a drive shaft, a crank portion is formed at a substantially central position in the length direction of the drive shaft, the crank portion being eccentric to the shaft center of the both end portions, and the both end portions of the drive shaft. Each of them is supported by a main bearing provided on the end wall of the casing and a bearing provided on the fixed scroll, and faces the side surface of the orbiting scroll end plate opposite to the surface on which the scroll wrap stands, and is connected. The bodies are arranged at a predetermined interval, the connecting body is integrally fixed to the orbiting scroll, and the body is provided in the central portion of the connecting body. The orbiting bearing is supported by the crank portion of the drive shaft so that the connecting body and the orbiting scroll can be integrally orbitally moved, and a heat insulating material is interposed in the connecting portion between the orbiting scroll and the connecting body. An oil-free scroll fluid machine characterized by 2. A rotation prevention mechanism bearing for rotatably bearing one end of a crankshaft for preventing rotation of the orbiting scroll by connecting the connection body and an inner wall of the casing to the connection body. The oil-free scroll fluid machine according to claim 1, wherein 3. A shaft hole through which the drive shaft is inserted is provided in a central portion of a scroll wrap of the orbiting scroll, and a predetermined space is formed between an inner peripheral surface of the shaft hole and an outer peripheral surface of the drive shaft. The oil-free scroll fluid machine according to claim 1 or 2, characterized in that.