JP3516016B2 - Scroll fluid machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention relates to a working fluid
Refrigeration and air conditioning compressors, air compressors and vacuum
Oil-free type compact and lightweight oil pump used for pumps
It relates to a crawl fluid machine. [0002] 2. Description of the Related Art Oil-free scroll fluid machines have been developed.
For the purpose, the rotating scroll end plate and fixed scroll
Or formed of an elastic body between the housing supporting the shaft
The above-mentioned operation is provided by providing a cylindrical seal member.
The suction side space of the room and the motor and drive shaft are housed
Shuts off the machine room and the fluid in each space flows in and out
With a swivel seal mechanism configured to prevent
A known example of a roll fluid machine is disclosed in Japanese Patent No. 2753317.
There is an official gazette. [0003] One of the means for reducing the size and weight is to use an end.
A pair of plates provided with spiral projection wraps or spiral grooves
Of the scroll members mesh with each other's spiral projections and grooves
Together with the compression chamber, and
The height of the tap and the depth of the groove are gradually reduced toward the center.
Use of stepped wrap to greatly increase tooth height and reduce diameter
As a well-known example of a method of forming a fence, Japanese Patent No. 1296413
There is an official gazette. In this known example, the capacity of a pair of compression chambers is formed.
Symmetrical wrap shape with the same product and planar shape
Regarding asymmetric wrap shapes with different volumes and plane shapes
Stairs described but applied to asymmetrical wrap shapes
There is no specific description about the attached wrap and the groove shape. [0005] The problem to be solved by the present invention
The challenge we are trying to address is that the drive system for the orbiting scroll
The lubricating oil enclosed in the machine room
For the purpose of oil free so that it does not flow into a certain working chamber
And the orbit provided between the orbiting scroll end plate and the housing.
Endurance of pressure seal mechanism to pressure difference between working chamber and machine room
To greatly improve the performance and durability against turning motion
At the same time, it is necessary to reduce the size and weight. A revolving seal mechanism is formed of an elastic body.
One end of the closed cylindrical seal film is the outer periphery of the orbiting scroll end plate.
The other end is fixed to the housing side.
Is defined. However, the side fixed to the turning scroll
Is centrifugal acting on orbiting scroll in orbital motion on circular orbit
Turning due to overturning moment due to force and gas compression load
Do a precession that turns when the scroll is tilted
Lubrication from damage caused by a large load acting on the seal film
There was a problem that oil leaked into the working chamber. The rigidity of this seal film
Significantly lowers the ability to follow the turning motion
In this case, the pressure difference between the inside and outside of the seal
Had the problem of being damaged. On the other hand, the floor applied to the symmetrical wrap shape
In a stepped wrap, the maximum enclosed space formed at two places at the same time
Step walls are formed at the center of each compression chamber.
So, about half the floor of the crescent-shaped compression chamber
Shallow groove depth reduces maximum enclosed space volume
Therefore, there is a problem that the size and weight cannot be reduced. further,
Looking at the behavior of such a stepped wall during one rotation of the shaft, it can be seen that
The stepped wrap and the groove are the closest to each other.
In the compression chamber
It is a section that communicates with each other. However, the orbiting scroll has a rotational moment.
Rotation within the circumferential gap of the anti-rotation mechanism
By rotating around the axis of the rotating bearing, two stairs
One of the gaps between the stepped wall between the wrap and the groove is reduced
Because the other expands a little, based on this rotation moment
It is not possible to reduce both gaps simultaneously. So
Therefore, it is necessary to seal between the compression chambers between the stepped walls.
Even if the shaft before turning into a closed space makes a half turn, the gap between the step walls
And the working gas leaks from the compression chamber to the suction chamber.
There was a problem that the performance was greatly reduced due to the occurrence of Further, for the purpose of simply reducing the size and weight,
The wrap strength can be obtained by simply increasing the tooth height of the wrap using
Gas compression acting on the side wall surface of the compression chamber lap only by securing
Centrifugal force acting on the center of load and the orbiting scroll
Center of gravity and slewing bearing assumed to be inside the end plate related to
The distance from the center between the cylindrical end faces of the
Reduction of overturning moment acting on orbiting scroll
The precession of the orbiting scroll becomes unstable
Damage to the rotary seal mechanism and the slewing bearing and thrust bearing.
Invitation reliability had been reduced. [0010] Further, manufacturing defects and severe use, etc.
The rotary seal mechanism is broken and the lubricating oil from the machine room
Is not expected to flow into
There was no function to detect leaked lubricating oil.
In the event of a leak, the entire system breaks down over time and
There was a problem that caused harm. [0011] Means for Solving the Problems Here,At firstoil
The orbital seal mechanism related to the free scroll compressor,
Next, conventional scroll shapes related to miniaturization and weight reduction
Means for solving the above problem will be described. Very thin flexible rubber or synthetic resin
One end of a cylindrical seal thin film 9 made of a material such as
Press the outer periphery of the roll end plate 3a with a seal band or O-ring.
Or the inside is sealed around the entire circumference with an adhesive, etc.
The lower end of the inner pedestal 5c provided on the housing is the same as the above-mentioned one end.
To seal the entire circumference and reinforce the seal film
Has some degree of freedom on both inside and outside or one side of the seal thin film cylinder
A cylindrical contact spring with extremely low lateral spring constant.
The swivel seal mechanism 8 configured by wearing the swivel scroll end
Provided between the plate and the housing. [0013] The housing and the fixed scroll and
And the ring-shaped separation space formed by the rotating scroll
Create a space in contact with the outer surface of the cylindrical seal thin film 9 to be divided.
The space in contact with the inner surface of the seal thin film is communicated with the suction passage of the working chamber.
To the machine room that houses the power transmission mechanism, etc.
If the suction passage communicates with the atmosphere,
The space with oil separation function or almost all oil
Through the ventilation case provided at a position that leads to
Pressure difference does not act on the inner and outer surfaces of the seal thin film
It is configured as follows. Next, a reduction in size and weight and a turning scroll will be described.
Enhancing the stability of motion to improve the reliability of the revolving seal mechanism
Scroll shape using stair-like wrap
Means for solving the conventional problem will be described.
To increase the stability of the turning scroll behavior,
Overturning moment to rotate the tool around the fulcrum of the acting force
They need to be eliminated or significantly reduced. The scroll shape as the means is as follows.Basic
TypicallyOne end is fixed on a circular end plate and the other end is flat outside the end plate
Having a front end surface that is parallel to the end plate surface of the
A swirl wrap with a constant spiral wall thickness is provided.
With orbiting scrollaboutOn the end face in a circular disk of equal thickness
A spiral groove with a parallel bottom surface of uniform depth and width is provided
A crescent moon formed by engaging fixed scrolls with each other
Shaped in asymmetrical wrap shape where the shape of inner and outer compression chambers is asymmetric
Is done. The flat surfaces of the inner and outer walls of the turning wrap and the end plate
Is formed from the lap tooth thickness on the circular orbit of the orbiting scroll
It has the width of the value obtained by adding twice the turning radius equal to the orbital radius.
The center of the U-shaped spiral groove is wound from the vicinity of the center
High step groove 3c with the height of the area one step higher than the outer peripheral side is provided
You. The plane shape of the groove step wall surface 3e where the high step groove rises
Is a semi-circular shape or
Is in contact with both sides of the revolving lap in approximately 1/4 arc.
Shaped with a straight line connecting the arcs at the center of the groove, facing the center
It is formed so as to be convex. The inside of the arc of the groove step wall is the outer wall of the turning wrap.
The point Rw in contact with is the beginning of the winding of the turning wrap outer lineOr1
Provided between the outside of the 巻 き winding and the outside of the arc of the groove step wall
Sw is in contact with the inner wall of the swirl wrap.
If a volute shape is used, the point
The inner wall of the lap on the opposite shore across the inflation line extending from the groove at point Rw
Are equal to the intersection of A turning wrap is wound around the bottom surface of the high step groove 3c.
Provide the beginning and inside the high groove, the back of the mirror surface
A hole with one end closed, such as a tea caddy that opens to the side
Slewing bearing 3f formed of a cylinder press-fitted in
Load support point at the center of both ends of the cylinder corresponding to the bearing
And the position corresponding to the end plate surface of the end plate
Make sure that they match or insert deeper into the bottom of the higher groove
Construct a rotating bearing. Further, half of the stepped wall surface 3e of the orbiting scroll groove is formed.
A line segment k passing through the arc center Os and the coordinate center Oa of the spiral curve
from the coordinate center Oa in the convex direction of the arc of the groove step wall from l.
The axis O is located at a position separated by a distance of 1/2 or more of the turning radius.
b, and / or a shaft center Ob
On the line parallel to the line segment kl,
The center of gravity Og of the orbiting scroll is provided on the difference wall side. On the other hand, a minute gap is formed on the mirror plate surface of the orbiting scroll.
Fixed scroll from the fixed scroll side mirror face
The depth of the spiral fixing groove 4a provided on the crawl is one.
Is fixed, but is formed to partition the fixing groove
From the beginning of the wrap to half-turn or 3/4 turn
It is formed of a fixing wrap that is low from the bottom of the fixing groove.
The outer side is formed with a fixed wrap at the same height as the mirror surface.
ing. Lap step wall 4 whose height changes stepwise
The exact position and shape of d is the spiral shape of the orbiting scroll.
The position to engage with the groove step wall provided in the groove and its envelope
Formed. The shape of the compression chamber formed based on the above configuration
The state is as follows. The outer wall at the end of the winding of the turning wrap
When the closest approach to the outer surface of the fixed groove of the fixed scroll
A maximum sealed space 50 of the outer compression chamber is formed on the outer wall
When the shaft advances half a turn from this position, the winding wrap ends.
The inner wall is closest to the inner wall of the fixed scroll spiral groove
And the volume of the maximum sealed space 50 on the inner wall side of the turning wrap
A maximum enclosed space 60 for the smaller inner compression chamber is formed. The maximum enclosed space 50 and the maximum enclosed space
It is as if there were no high step grooves in the space 60
And the largest enclosed space
The decrease in volume is negligible. Semicircular arc of the step wall 3e of the groove of the orbiting scroll
Fixed scroll where the outside touches the inner wall of the turning wrap
The outside of the lap step wall 4e is in contact with or closest to
Vc is the volume of the outer compression chamber and Vd is the volume of the inner compression chamber.
Is the ratio of the maximum enclosed space 50 to the volume Va.
Compression ratioVa / VcAnd the volume Vb of the maximum enclosed space 60
Compression ratioVb / VdSwivel scroll to make
The height of the high step groove and the fixed scroll to mesh with this
Set the height of the fixed wrap with a lower level. The orbiting scroll is fixed with respect to the fixed scroll.
Revolving motion without rotation, that is, turning motion
The anti-rotation mechanism has two perpendicular to both sides of the ring
Oldham ring with a key or key groove
Key holes in the swivel scroll and housing so that
Is provided with two keys and engaged with each other
The Oldham mechanism is used. Oldham machine as anti-rotation mechanism
In addition to the structure, pink seen in Patent No. 3016113
Rank mechanism and the button mechanism disclosed in Japanese Patent No. 1296413.
The object can also be achieved by using a screw coupling mechanism. Further, the turning seal mechanism is defective in manufacturing.
And the operating oil is damaged due to
Rotate the oil detection sensor 20 assuming that it flows into the inlet side.
Rotary seal mechanismOutsideIn a housing where oil can easily accumulate in the vicinity
Install. The operation of the technical means of the present invention is as follows.
It is. From the seal film 9 and the close contact spring that protects it
And a rotating scroll end plate and a housing.
To completely separate the working room and the machine room.
Thereby, the working chamber can be completely oil-free. Only
Also, the inside of the suction passage is approximately equal to the atmospheric pressure, and the machine room is also
The pressure inside and outside the seal thin film communicates with the atmosphere through the remote space.
Little difference in force
-The stability of the behavior of
It can be secured in minutes and will not be damaged. Next, looking at the state of the compression chamber,
The outer compression chamber formed on the wall side forms the maximum closed space 50.
Until the shaft makes one full rotationHigh stepSpiral without grooves
Compression is continued in a state where the groove depth is constant. On the other hand,
The inner compression chamber formed on the inner wall side of the
When starting compression after forming, a high step groove appears and the volume decreases
The degree becomes larger than that of the outer compression chamber. Then, the turning scroll groove stepped wall surface is turned.
The inner wall of the fixed wrap comes closest to the point Rw in contact with the outer wall of the lap
The inner and outer compression chambers in the
Since the compression ratio, which is the ratio of volume to volume, is equal, its internal pressure
Is also equal. When the shaft rotates further from this state, it comes into closest contact
Close inner wall of grooved step wall and inside of lap step wall
The boundary part gradually separates, the gap expands, and the inner and outer compression chambers communicate.
After operating as one compression chamber, it communicates with the discharge hole and compresses
Gas is discharged. The tangential force accompanying the gas compression is
Base of the fixed lap which is further away from the center of the base circle
The center of the turning lap is located at the center of the base circle from the midpoint of the base circle.
To be wrapped around the center of the semicircular arc
When the stepped wall is located, tangent the slewing bearing axis
Directional forceFrom the point of actionPositioned on the center side of the base circle of the fixed lap
The shaft driving the orbiting scroll
The rotation moment that rotates in the opposite direction to the rotation acts.
And the groove step wall approaches the lap step wall side
Reduces the gap between the difference walls to improve the sealing between the compression chambers
You. In addition, a spout
A large differential pressure acts on the turning lap due to the output pressure
Is wrapped by lowering the tooth height of the wrap substantially due to the high step groove
Increases strength and lubricates through oil holes provided in the shaft.
Lubricating oil at the end of the orbiting axis of the orbiting scrollHigh step grooveInside the bottom
To cool the center of the orbiting scroll
This prevents thermal deformation of the scroll member and cooling of the compressed gas.
This has the effect of reducing the pressure of the compressed gas. Furthermore, the turning seal mechanism has a manufacturing error.
Lubricating oil in the machine room operates due to damage from severe operating conditions
If the oil spilled into the room, the oil was provided in the housing.
The electric signal detected by the oil sensor is sent to the control system of the compressor.
It is sent and informs the display board of the abnormality and issues a warning or compressor
Will be stopped, so the damage will not affect the entire system
Minimized. [0032] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
The chair will be described with reference to FIG. FIG. 1 shows one embodiment of the present invention.
It is a longitudinal section of scroll compressor 1 which showed an example. This
The internal space of the compressor is composed of scroll members
The working chamber formed by the compression mechanism, the electric motor 14 and the power transmission
It is roughly divided into a machine room 32 that accommodates the delivery mechanism. It
A housing 5 is provided between the two spaces,Power transmission mechanism
Plays a role in supporting. The working chamber is a spiral curve of a scroll member.
Includes a compression chamber and a passage through which working gas flows in and out
It is divided into a low pressure space and a high pressure space. And the electric motor 14
Housing fixed to the casing 13 for holding the
Spiral fixing on a thick disk-shaped plate bolted to 5
On the fixed scroll 4 provided with the groove 4a and the circular end plate 3a
A spiral wrap 3b is provided and a cylindrical wrap is provided inside the spiral wrap 3b.
Provide 2 places of 3 g of rotating bearings and 3 g of key grooves for anti-rotation mechanism.
Fixed grooves 4a of the orbiting scroll 3 constituted by
And the rotating wrap 3b are engaged with each other to form a plurality of compression chambers.
Has formed. The machine room 32 includes a main power transmission mechanism.
Shaft 7 and a refueling pon directly connected to its end
And the lubricating oil 18 supplied to each sliding portion is stored.
And a ventilation casing also serving as a terminal provided on the casing 13.
The internal pressure is
Atmospheric pressure is maintained. AA sectional view, BB sectional view, and C-sectional view of FIG.
The C sectional view and the enlarged view as viewed from the direction of the arrow D are shown in FIGS.
You. The power of the motor is supported by a main shaft 5a provided in the housing 5.
The shaft provided at one end through the shaft 7 obtained is
The turning shaft part 7b, whose turning radius is eccentric from the center of the shaft,
As shown in FIG. 2, the orbiting scroll 3 is inserted into the orbiting bearing 3f.
It is transmitted by entering. Turning to the housing as shown in FIGS. 1 and 4
180 ° on one side of the ring with rectangular cross section between scrolls
Two turning keys 6a are provided facing each other, and the back surface is also 90 °.
Two similar frame-side keys 6b are provided out of phase.
Oldham ring 6 is attached. Oldhamri
Two pairs of keys are provided on the orbiting scroll.
It was provided at a position 90 degrees out of phase with two key grooves.
Slidably inserted into two key grooves on the housing side
Thus, a rotation preventing mechanism is configured. A fixed scroll at the outer peripheral end surface of the housing 5
Is formed with a separation space 30 inside.
Inner pedestal having a conical trapezoidal cross section and also serving as a spindle boss
Turning with ring-shaped thrust bearing 5b provided outside of 5c
It is configured to receive the thrust force of the scroll. So
The Oldham ring 6 is housed in the inner space of the thrust bearing.
Has been delivered. And the separation space formed in a ring shape
30 is composed of a plurality of parts so as to separate the inside and outside.
A cylindrical turning seal mechanism 8 is provided. FIG. 5 is an enlarged view of FIG.
As described above, the turning seal mechanism 8 is provided with the turning scroll 3 and the housing.
Material such as thin rubber or synthetic resin provided between
Highly flexible cylindrical seal thin film 9 and its upper end
That seals and seals the outer periphery of the rotating scroll end plate 3a.
12 and the lower end of the seal thin film outside the pedestal 5c in the housing.
Seal band 12 that is sealed and fixed to the peripheral bottom, swivel scroll
Between the outer peripheral portion of the end plate 3a and the outer peripheral bottom portion of the housing inner pedestal 5c.
It was provided with some degree of freedom outside the seal thin film 9 between them.
Lateral rigidityLowOuter close contact spring 10 and end of rotating scroll
The groove 3i provided on the outer periphery of the plate 3a and the outside of the housing inner pedestal 5c
It has some degree of freedom inside the seal film 9 between the peripheral bottom and
Composed of an inner contact spring 11 having a low lateral rigidity
I have. Appearance of parts constituting swivel seal mechanism 8
The shape is shown in the exploded view of the components in FIG. Of the seal thin film 9
The diameter is approximately equal to the outer diameter of the rotating scroll end plate 3a.
The inner diameter of the contact spring 10 and the outer diameter of the inner contact spring 11 are respectively
It is formed approximately equal to the outer diameter and inner diameter of the seal thin film.
You. In addition, fixed scroll or swivel scroll and howl
Between the external contact spring and the internal contact spring
A gap of about 1 mm or more is provided on the end face in the axial direction.
Configuration. In addition, two places at the upper and lower ends
The fixing portion of the seal thin film fixed by the seal band 12 is
The airtightness is ensured. As shown in FIG.
5 In the space leading to the lower working chamber
It is installed. The principle of detecting oil is working gas and lubricating oil
A method that uses the difference in the characteristics of the two is used. For example, oil particles
Using the light sensor and the specific heat with scattering
Hot wire anemometer and capacitance using difference in dielectric constant
Sensors and the like are conceivable. And in production and handling
The rotating seal thin film is damaged due to problems, etc., and lubrication inside the machine room
If any oil leaks into the working chamber, this oil detection
The sensor operates. Next, a revolving scroll constituting a compression mechanism portion.
Detailed shapes of the fixed scroll 3 and the fixed scroll 4 will be described.
You. Fixed scroll mounted on housing 5 as shown in FIG.
Of the bottom of the fixing groove 4a from the mirror plate surface
The depth is uniform, and the compressed gas flows out near the center.
A suction hole 4i is provided on the outer peripheral side at the end of winding the discharge hole 4h.
Have been. The position of the orbiting scroll 3 shown in FIG.
At the end, the end of the outer wrap of the revolving wrap 3b is fixed scroll
End of the fixed groove 4a, the end of the turn
A maximum sealed space 50 of the outer compression chamber located on the wall side is formed.
However, the inner compression chamber located on the inner wall
This shows a state in which the stroke has progressed about half a turn. This
As shown in the figure, the asymmetrical
It is configured in a top shape. The spiral groove of the orbiting scroll is raised one step.
FIG. 2 is a sectional view taken along line AA of FIG. 1 when the high step groove 3c is viewed from above.
Half of the grooved step wall 3e provided in the high step groove of the orbiting scroll
Part of the arc shape is visible. The solid corresponding to this high step groove 3c
4d of wrap step wall of fixed wrap provided in constant scroll
Is hidden by the diagonal line that represents the cut surface and is hard to see, but the lap tooth thickness is
Are indicated by dotted lines. The groove step wall 3e and the lap step wall 4
The shape of d is clearly shown in FIG.
As described above, the lap step wall 4d has the lap tooth thickness as the diameter.
The groove step wall 3e has a turning radius
Twice the lap tooth thickness, ie the groove width is the diameter
It has a semicircular shape in contact with the inner and outer walls of the turn wrap.
The semicircular shapes of the groove step wall and the lap step wall are mutually
There is a relationship that becomes an envelope. FIG. 3 is a sectional view taken along the line BB of FIG.
As shown in the figure, the spiral is represented by an involute curve
Of the high-step groove of the orbiting scroll surrounded by the line and the groove step wall 3e
Inside, one end like tea caddy is closed and the other end is opened on the back of end plate 3a.
The opening is the slewing bearing 3f, and the slewing bearing
The pivot 7b, which is a part of the shaft 7, is inserted with a gap
I have. And one end penetrates through the inside of the shaft 7
Oil supply opening at 16 and the other end passing through the pivot axis and opening at the end face
A hole 7c is provided to introduce lubricating oil into the high step groove 3c.
And FIGS. 6 and 7 show the shape of the orbiting scroll.
Will be described in detail. As shown in FIG. 6, an end plate 3 having a nearly circular shape and an equal thickness.
a rotating slab of equal thickness formed from an involute curve on a
2 turns from winding start point Pw to winding end point Qw
A mirror which is formed by weakness and is a flat surface on the lap side of the end plate 3a.
The height from the plate surface to the tip of the turning wrap 3b is from the beginning of winding
The inner and outer walls of the swirl wrap are equal throughout the winding
Start of spiral wrap winding of spiral groove with U-shaped cross section surrounded by
The height of the entire inner area from the position in contact with the nearby outer wall
A high step groove 3c which is one step higher than the surface is provided. The groove step wall 3e where the high step groove rises
The plane shape is in contact with the side wall of the turning wrap and is convex toward the center.
It has a semicircular arc shape. The center side of this semicircular arc is
The point Rw in contact with the outer wall of the turning wrap does not start to turn around the turning wrap
The semi-circular arc is provided between the 1/4 turn extended position
The point Sw where the outside of the shape contacts the inner wall of the turning wrap is the point Rw
The extension line extending from the base circle passing through and the spiral groove at point Rw
It is provided as a point where the inner wall of the turning lap on the opposite bank intersects
You. Then, in the narrow groove provided at the tip of the turning wrap
Is mounted with a movable chip seal 22. FIG. 7 is a sectional view taken along the line A--A in FIG.
As shown in FIG.
The center of both end surfaces of the cylindrical portion of the pivoted bearing 3f is a head plate.
Groove 3 which is equivalent to the horizontal position of the surface or higher
c A tea tube-shaped hole is provided so as to be located on the bottom surface side. Next, the shapes of the fixed scroll are shown in FIGS.
And will be described in detail. 8 is a plan view of the fixed scroll 4 of FIG.
As shown in FIG.
From the mirror surfacedepthThe center of the fixed groove 4a where
A discharge hole 4h is provided in the vicinity, and a suction passage is provided on the winding end side.
And a suction hole 4i. A spiral-shaped wall serving as a partition between the fixed grooves 4a
The fixed wrap is about one turn inward from the position connected to the mirror surface
Start from the high fixed wrap 4b wound around
Fixing the height from the bottom of the groove, which is about a half turn and strong wound up to low
It is composed of a wrap 4c. Low fixed wrap 4c
As shown in Fig. 9, the height from the groove bottom is high.
About 40% of the total. From this high fixed wrap to a low fixed wrap
A groove step wall 4d perpendicular to the groove bottom is provided at the switching point
The shape of the end face is a semi-arc with the diameter of the lap tooth thickness
It is formed in a shape. Setting position of the groove step wall 4d,
The shape and height of the end face are high step grooves 3 provided in the orbiting scroll.
c and the lap step wall 3e.
You.Also, the width is narrow from the end plate surface to the fixed wrap tip surface.
A movable chip seal 23 is mounted in the groove. Next, the vortex of the slewing bearing 3f axis and the slewing wrap.
The center of the base circle of the involute curve
Relative to the center of gravity of the orbiting scroll
Will be described. FIG. 10 shows that the shaft rotation angle is approximately
Advances slightly less than a half turn, and the fixed scroll wrap
The center of the arc on the center of the arc
This shows a state in which the parts are closest. With this closest approach,
Formed inside and outside the high fixing wrap 4b and the low fixing wrap 4c
The pressure chambers having different pressures are sealed. Then, the gap between the closest step wall surfaces
The size of the orbit around the orbiting bearing acting on the orbiting scroll
It depends on the direction of the rotation moment. In the state of FIG.
If the turning scroll rotates clockwise or right, the step wall
The gap between the faces increases, and if you turn to the left, the gap decreases.
You. The direction of the rotation moment is the center of the slewing bearing and the slewing slide.
The center of gravity and gas compression load related to the centrifugal force of crawl
It is determined from the relative positional relationship with the action point. The relative positional relationship between them is defined by a turning scroll.
The details will be described with reference to FIG. Swirl
The base circle center Oa of the line and the semicircle center Os of the groove step wall 3e
When the line segment connecting is set to kl, the rotation
-As a means to obtain the sealing effect by the
The center of gravity Og of the roll passes through the center Ob of the slewing bearing, and the line segment kl
On the groove step wall 3e side from the center Ob on a line parallel to
Is done. Further, the rotation moment with respect to the gas compression load
As a means to obtain the sealing effect of
Slewing bearing center Ob is grooved step wall 3e from line segment kl.
On the convex side of the semicircular arc, separate from the turning radius by about 1/2 or more.
Place. However, the rotating moment acting on the turning scroll
The size is the sum of the effects of centrifugal force and gas compression load.
Therefore, only the larger one may be applied. Further, the end of the turning wrap shown in FIG.
As means for increasing the strength of the free end near the point Qw,
Not fixed, but fixed to connect the end to the end plate
An angular or stepped rib may be provided. The scroll compressor constructed as described above
The operation will be described below. The four figures (a) to (d) shown in FIG.
90 degree shaft 7 of the scroll compressor according to the present invention
Explanation of the operating principle showing the state of the compression chamber by rotating at the pitch
FIG. The upper and lower two figures in FIG.
The volume and pressure of the compression chamber, which change according to the shaft rotation angle of 7,
The volume axis represents the volume of the maximum sealed space 50 of the outer compression chamber as 1
The pressure axis is expressed as a volume ratio of
It is expressed in a range from the input pressure Ps to the discharge pressure Pd. In the drawing of FIG. 13A, the turning wrap 3b
The point Qw in FIG. 6 which is the winding end point of the outer wall is a fixed scroll.
Formed on the outer wall of the turning wrap closest to the inner wall of the spiral groove 4a
A maximum sealed space 50 of the outer compression chamber is formed. That
The volume and pressure of the compression chamber in the state are the vertical axis rotation angle θ0 in FIG.
100% of point A in the figure of volume shown on each axis and pressure
Corresponds to the suction pressure Ps at point P in FIG. The shaft rotation angle has advanced by 180 ° from this state.
In (c), the point Qw at the end of winding of the inner wall of the turning wrap 3b
Of the fixed wrap 4b with the inner wall side of
A maximum sealed space 60 of the inner compression chamber is formed on the inner wall side of the top,
The state of the compression chamber is shown on the vertical axis of the shaft rotation angle θ1 in FIG.
In other words, in the diagram of the volume, point B becomes smaller in volume than point A.
Therefore, in the pressure diagram, the suction pressure Ps at point Q is obtained. The maximum closed space 6 of the inner compression chamber shown in FIG.
In the vicinity of the center of the crescent-shaped compression chamber where 0 is formed,
Crawl side semi-arc shaped groove step wall 3e is inside turning wrap
After the lap step wall 4e comes closest from the position where it contacts the wall,
While sealing between the constriction chambers, advance slightly along the grooved step wall 3e.
The maximum closed space 60 has a grooved step wall.
The face 3e shows a slight face, but its effect on the volume
Is extremely small and negligible. Further, from about 1/4 turn before (c)
The half-turn section that has advanced about 1/4 of (d) is the lap step.
The groove step wall 3e is closest or in contact with the wall 4d
Move in a state. Gas acting on the orbiting scroll 3 at that time
Direction of action of compressive load or centrifugal force and shaft of slewing bearing 3f
Left-handed self-rotation seen from the drawing resulting from the relationship with the center position
The rolling moment is 3 g of the key groove in two places of the orbiting scroll.
Ring 6 having a turning key 6a inserted into the ring
Is received by the housing side key 6b through
The center of the revolving axis of the revolving scroll by this rotation moment
The rotation angle around the two pairs of turning side and housing side keys
Side wall gap or groove step wall 3e and lap step wall 4d
Determined by the gap between them. The rotation angle is adjusted by the key through the Oldham ring 6.
-If set with side wall clearance, wrap with the grooved step wall
Move between step walls while maintaining a small gap between step walls
Compression divided into fixed wraps 4b and 4c
Sealing between the chambers becomes possible. A position advanced by about 1/4 of (d)
(D) outer compression chamber and inner compression chamber at approximately intermediate position
The area of the bottom of the crescent-shaped groove is equal to each other
However, the bottom of the groove of the outer compression chamber is the same as the maximum sealed space 50.
Depth is similar, but in the case of the inner compression chamber, its crescent shape
A high step groove 3c appears at approximately the center of the bottom of the
Pressure is less than half of the high lap side.
The volume is significantly reduced compared to the constriction chamber. This state corresponds to the shaft rotation angle θ2 in FIG.
The volume of the outer compression chamber 54 is represented by point C,
The product is represented by a point D that is less than that. These volumes and
Internal / external compression indicating the ratio to the volume of each maximum enclosed space
The volume ratio of each chamber is equal to each other at this axis rotation angle
So that the pressure in each compression chamber is R
Equal as indicated by the dots. That is, the symbols in the volume change diagram of FIG.
In response, the volume of the maximum sealed space 50 of the outer compression chamber is set to Va.
Vc is the volume of the outer compression chamber at point C
The volume of the maximum sealed space 60 is set to Vb, and the inner compression chamber at the point D is set.
Is set as Vd, so that the following equation is satisfied.
c and a low fixing wrap 4c are formed. Va / Vc = Vb / Vd Only Vd changes with the height of this step-like groove or wrap
And the height of the groove or wrap isaboutSatisfy the above formula
Is determined from the conditions Further, from the shaft rotation angle θ2 in FIG.
Is in the state near the middle between (d) and (a), that is, the groove step
When the distance between the difference wall surface 3e and the lap step difference wall surface 4d is closest,
The gap gradually widens from the state of the final stage and expands (a).
Shows the maximum value equivalent to about twice the turning radius at the break point
After that, it turned to decrease and the state of closest approach again before (c)
During the half rotation, the outer and inner compression chambers are in communication.
The compression chambers are combined and behave as one compression chamber. In this state, the shaft rotation angles θ2 to θ3 in FIG.
, And the volumes at points C and D on the volume axis are combined into E
Since there is one compression chamber represented by a point, the pressure in this compression chamber
Becomes one, and after the transition from point R to point T, the outer compression chamber
The discharge stroke is started by communicating with the discharge hole 4h. Directly connected to the discharge port
As a direct discharge passage of the inner compression chamber that does not
Gap between the start of winding of the wrap and the fixed wrap
Used. The state immediately before communicating with the discharge port is roughly shown.
In (a), there is a large gap between the step wall surfaces and
Indicates that the compression chamber is in communication,
When the volume of the compression chamber is set to Vi and Vo, respectively,
The specific compression ratio is expressed by the following equation. (Va + Vb) / (Vi + Vo) The volume Vi constituting the inner denominator can be obtained by providing the high step groove 3c.
Large natural compression with a small number of spiral turns
It is possible to obtain a ratio. As described above, the high step groove 3c and the low fixing groove
Of a scroll member with a staircase provided with a pair of
Of the wrap at the beginning of the winding
The same as when the diameter of the scroll member is reduced by
At times, the swivel bearing is inserted by inserting the swivel bearing 4f into the bottom of the high step groove 3c.
The effect of radial gas compression load and centrifugal force on the crawl
Using the slewing bearing as a fulcrum by shortening the distance to the service point
Substantial reduction in overturning moment for rotating orbiting scroll
Can be reduced. Also, the diameter of the scroll member has been reduced.
On the wrap tip of the orbiting scroll and the bottom of the spiral groove.
To reduce the thrust load caused by gas compression
it can. [0073] The scroll compressor constructed as described above.
The effect of this will be described below. Orbiting scroll end plate and housing
Seal upper and lower ends with seal band
A fixed sealing film 9 is provided in the separation space to provide a working chamber and a machine.
Lubricating oil used in the machine room by completely separating the chamber
To prevent oil from entering the working gas
There is an effect that freezing can be achieved. Further, it is mounted along the inner and outer surfaces of the seal thin film.
The differential pressure and inertia force acting on the seal thin film
To protect the extremely thin seal film and
Stepped scroll shape and insertion type of slewing bearing on wrap side
Moment acting on orbiting scroll by applying shape
Stabilization of the behavior by drastically reducing the
Revolutionary seal mechanism 8 that prevents damage and has high reliability
There is a clear effect. In addition, turning due to manufacturing or handling problems, etc.
The seal film is damaged and lubricating oil in the machine room is
In the event of a spill, the oil detection
Alarms or shut down the compressor
This has the effect of preventing damage from spreading. The scroll shape of the asymmetrical wrap has a step-like shape.
By providing a pair of groove and wrap, the wrap winding start side
Make the tooth height higher than before while ensuring the strength of the wrap
It is possible to reduce the diameter of the scroll member and
Slewing bearings are inserted into the stepped spiral groove of the orbiting scroll
Has the effect of reducing size and weight.
Occasionally the wrap has a small diameter, causing the wrap tip to spiral
Shorter length along the line and higher pressure
The height of the stepped wrap side wall near the center is low and the gap between the compression chambers is low.
The scroll length can be shortened, and the orbiting scroll
Groove and lap step wall using rotation moment used
The internal seal mechanism greatly reduces internal leakage and improves efficiency
There is an effect that can be achieved. Further, an overturn mode acting on the orbiting scroll is provided.
The significant reduction of the element is due to the relative tilt between the slewing bearing and the slewing shaft.
The effect is that the durability of thrust bearings and slewing bearings increases
There is fruit. Further, from a pair of step-like grooves and wraps
It is possible to reduce the size and weight by applying the scroll shape that is formed.
And the application of a swivel seal mechanism to each sliding part in the machine room
To supply lubricating oil and use cheap sliding bearing materials
This has the effect of significantly reducing costs while reducing noise.
You.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional view of a scroll compressor according to the present invention. FIG. 2 is a sectional view taken along line AA of FIG. FIG. 3 is a sectional view taken along line BB of FIG. 1; FIG. 4 is a sectional view taken along line CC of FIG. 1; FIG. 5 is an enlarged view as viewed from an arrow D in FIG. 1; FIG. 6 is a plan view of the orbiting scroll. FIG. 7 is a sectional view taken along the line AA of FIG. 6; FIG. 8 is a plan view of a fixed scroll. 9 is a sectional view taken along line AA of FIG. FIG. 10 is a diagram showing a relationship between a groove step wall surface and a lap step wall surface. FIG. 11 shows the relationship between the spiral center of the orbiting scroll, the center of the bearing, and the position of the center of gravity. FIG. 12 is an exploded view of components of a turning seal mechanism. FIG. 13 is an explanatory view of a compression principle of the present invention. FIG. 14 is a diagram illustrating changes in the volume and pressure of a compression chamber. [Description of Signs] 3 Revolving scroll 3b Revolving wrap 3c High step groove 3e Groove step wall 3f Revolving bearing 3h Seal groove 3i Spring groove 4 Fixed scroll 4c Low fixing lap 4d Lapp step wall 5 Housing 5a Main bearing 5b Thrust bearing 5c Inner pedestal 6 Oldham ring 7 Shaft 8 Rotating seal mechanism 9 Seal thin film 10 Outer contact spring 11 Inner contact spring 12 Seal band 16 Oil pump 18 Lubricating oil 20 Oil detection sensor 21 Ventilation case 30 Separation space 32 Machine room 50-55 Outer compression room 60-63 Inner room

Claims (1)

(1) A spiral shape having one end fixed on a circular end plate and the other end parallel to the end plate surface of the flat portion outside the end plate and having a front end surface at the same height. A revolving scroll with an extended revolving wrap and a fixed scroll with a spiral fixed groove with a bottom surface with a uniform depth and parallel to the end surface in a disk of approximately equal thickness near a cylinder are formed by meshing with each other In the scroll fluid machine having an asymmetrical wrap shape in which the shape of the crescent-shaped inner and outer compression chambers is asymmetrical, the wrapping of the orbital wrap 3b of less than about two turns or one less than that.
The plane shape provided so as to be in contact with the outer wall surface of the turning wrap protruding outside by 巻 き winding and the inner wall surface of the turning wrap having a winding angle of 2π radians outside of the winding angle has a curvature larger than the turning radius and is formed in the center. A groove step wall 3e having a semi-circular shape convex toward the front and a high step groove 3c in which the height of the center of the spiral groove is raised by one step from the groove step wall are formed, and the outer winding end of the turning wrap 3b is terminated. The orbiting scroll 3 is formed by providing a triangular rib or a step-like rib having a thickness equal to or less than the orbiting wrap fixed to the portion and the end plate along the spiral shape, and partitions the spiral fixing groove. A wrap step surface 4d is provided between the half turn and the 3/4 turn from the beginning of the winding of the fixed wrap as a wall, the wrap step surface 4d serving as an envelope of the groove step wall 3e provided on the revolving scroll. Yo The outer side is formed by a fixing wrap 4b having the same height as the end plate surface, and a fixing wrap 4c is provided on the center side of the lap step wall surface, in which the height from the groove bottom is one step lower than the fixing wrap 4b. Scroll 4
When the outer wall of the end portion of the orbiting wrap is closest to the outer wall surface of the spiral groove of the fixed scroll, the maximum of the outer compression chamber formed on the outer wall surface of the orbiting wrap that is one turn inside from the end of the orbiting wrap winding The volume of the closed space A is set to Va, and when the inner wall of the end of the orbiting wrap is closest to the inner wall of the spiral groove of the fixed scroll, it is formed on the inner wall surface of the orbiting wrap that is one turn inside from the end of the orbiting wrap. The volume of the maximum sealed space B of the inner compression chamber is set to Vb, and the outside of the wrap step wall 4e of the fixed scroll comes into contact with or comes closest to the position where the outside of the semicircular portion of the groove step wall 3e of the orbiting scroll contacts the inner wall of the wrap. When the volume of the outer compression chamber in the state is Vc and the volume of the inner compression chamber is Vd, the compression ratio Va / V is the ratio to the volume Va of the maximum sealed space 50.
and the high-stage groove 3c of the orbiting scroll for equalizing the compression ratio Vb / Vd, which is the ratio of c to the volume Vb of the maximum enclosed space 60.
A scroll fluid machine comprising a fixed wrap 4c having a lower fixed scroll so as to mesh with the height of the fixed wrap 4c.