JPH0112953B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field of the Invention) The present invention relates to a scroll compressor that uses a combination of a fixed scroll and an oscillating scroll.

(Prior Art) Prior to a detailed explanation of the present invention, first, the structure and operation of a scroll compressor using a scroll formed by connecting semicircular arcs will be briefly described.

FIG. 1 shows a scroll formed by sequentially connecting semicircular arcs. That is, in FIG. 1, the scroll 1 draws semicircles with radii (a-t)/2 and (a+t)/2 centering on point o, and then draws semicircles a/2 apart from point o. point
The radius (2a−
Draw each semicircle of t)/2 and (2a+t)/2,
Thereafter, this process is repeated, and in the example shown in FIG. 1, four semicircular arc groups of basic pitch a and tooth thickness t are successively connected in a scroll shape. Hereinafter, such a configuration will be referred to as a two-turn scroll.
Note that the end of the smallest semicircular arc of this scroll 1 is placed in a semicircular arc whose diameter is the tooth thickness t.

Further, FIG. 2 shows the principle of operation of a scroll compressor constructed by combining one set of scrolls shown in FIG. 1, and in this FIG. 2, 2 is a fixed scroll; 3 is an oscillating scroll that is symmetrically combined with the fixed scroll 2 .

Here, the fixed scroll 2 is stationary and fixed at the arrangement position, the center o ₁ corresponding to the point o is immovable, and the oscillating scroll 3 is Due to the combined arrangement, compression chambers 4 and 5, which are closed arcuate spaces, are formed between the fixed scroll 2 and the fixed scroll 2.

Then, the center O ₂ of the swinging scroll 3 with respect to the point o' is set at a distance of o 2 -A around the fixed point A corresponding to the point _o ' of the stationary scroll 2. If it is held at t and rotated, that is, oscillated or revolved without changing its posture, as shown in Fig. 2 at each angular position of 0°, 90°, 180°, and 270°, The compression chambers 4 and 5 are once opened at the outer periphery and then gradually decrease in volume toward the center, and if the object to be compressed is a fluid, the fluid is taken out from the discharge port 31 shown by the dotted line. be able to. During this operation, the center point B of the outer end of the scroll of the swinging scroll 3 is located around the fixed point C on the line D-D' connecting the fixed point A and the center _o1 of the fixed scroll 2 . , a circular motion of radius a/2-t is performed.

In this way, a compressor can be constructed by symmetrically combining one set of scrolls.

By the way, as this type of scroll compressor, USP No. 4065279 is known, which describes a scroll compressor in which an oscillating scroll is oscillated by an electric motor via a main shaft to perform a compression action. There is. Here, since the oscillating scroll is connected eccentrically to the main shaft and rotates, a balancer is provided on the main shaft to maintain static and dynamic balance in order to balance the imbalance. However, in an oscillating scroll, since its spiral is asymmetrical, the center of gravity does not coincide with the eccentric position, and the center of gravity does not rotate on the rotation center axis of the main shaft, making it impossible to achieve perfect balance. Therefore, there was a problem that vibrations due to unbalance of the rotation system could not be prevented.

(Summary of the Invention) This invention provides a balancer at a position on the scroll base plate of an oscillating scroll so as to match the center of gravity of the oscillating scroll with the axial center of the oscillating scroll and at a position that does not impede the operation. A balance weight for balancing the oscillating scroll is provided in order to eliminate the above-mentioned drawbacks.

(Embodiments of the Invention) Examples of the scroll compressor of the present invention will be described.

3 to 6 show an embodiment of the above-mentioned swinging scroll 3 , and FIGS. 7 and 8 show an embodiment of the support and swing mechanism for the swinging scroll 3 . It shows.

In FIGS. 3 to 6, the swinging scroll 3 has swinging scroll teeth 6, a swinging scroll base plate 7 with the swinging scroll teeth 6 protruding from one surface, and a swinging scroll base plate 7 having the swinging scroll teeth 6 protruding from one surface. an oscillating scroll shaft 8 extending on one surface; oscillating guide recesses 9 similarly formed on the other surface at equal angular intervals on a concentric circle;
It consists of an oscillating scroll balancer 10,
Further, reference numeral 11 is an imaginary extension line of the inner surface of the oscillating scroll tooth 6.

In addition, in FIGS. 7 and 8, each guide pin 12 having a shaft end with a smaller diameter loosely fitted into the swing guide recess 9 of the swing side scroll 3 is connected to a flange portion of the main body 13 . is supported by each guide pin hole 14 formed corresponding to each of the recesses 9, and the swinging scroll base plate 7 is in contact with the thrust bearing surface 15 at the tip thereof, and the center shaft hole 1
The oscillating scroll shaft 8 is pivotally supported in an eccentric hole 18 of a crankshaft 17 which is rotatably supported on a crankshaft 17. Note that in the figure, numerals 19 to 23 indicate oil holes.

Therefore, according to the embodiments shown in FIGS. 3 to 8, the swing scroll shaft 8 of the swing scroll shaft 8 is connected to the eccentric hole 18 of the crankshaft 17 , and each swing guide recess 9 is connected to each guide pin 12. As the crankshaft 17 rotates from 0° → 90° → 180° → 270° as shown in FIG. 9, the oscillating scroll 3 rotates as shown in FIG. Then, the relative position remains the same and the swing is performed.

However, when the lever swings, the distance between the center J of the crankshaft 17 and the center K of the swinging scroll shaft 8 needs to be maintained at a/2-t as explained in FIG. In order to make it happen, the 9th
As shown in the figure, if the diameter of the guide pin 12 is b, then the diameter of the swing guide recess 9 must be a+b-2t.

Furthermore, in FIGS. 3 and 5, E~
E', F~F' and G~G' are each the base line, K is the center of the oscillating scroll shaft, h is the oscillating scroll tooth height, I
is the center of gravity of the oscillating scroll tooth portion when there is no balancer.

That is, in this way, a desired swing trajectory can be constructed by at least three swing guide recesses 9 and each guide pin 12 that is loosely engaged with the swing guide recesses 9.

Now, regarding the balancing of the swinging scroll 3 according to the configurations of the embodiments shown in FIGS. 3 to 6, as is clear from the drawings, the center of gravity of only the swinging scroll teeth 6 is located at the base line G~ It will be located near point I on G'. This is due to the fact that the shape of the scroll teeth is not symmetrical. If this swinging side scroll 3 is replaced by a balancer 10
If the rocking motion is to be made as described above in a state where there is no This is because the swinging side scroll 3 performs a swinging motion, and in such a case, it is very difficult to achieve balancing.

For this purpose, a balancer 10 is provided in the embodiment,
The center of gravity of these scroll teeth 6 and the balancer 10 is made to coincide with the center K of the oscillating scroll shaft, and in order not to impede the operation, it is placed outside the virtual extension line 11, It is sufficient to select a shape that has the same height as the scroll tooth height h and the center of gravity in the height direction, and also selects its mass, so that the entire center of gravity of the swinging side scroll 3 is the same as that of the swinging scroll. equal to the center K of the axis,
Moreover, it is possible to perform balanced eccentric rotation around the axial center J.

The details of the crankshaft 17 are as follows.
As shown in the figures or FIG. 12, the base end of the shaft is stepped to form a motor mounting part 26, and an oil groove 27 is formed on the outer periphery of the shaft. Falling off from the shaft hole 16 is prevented.

Next, an embodiment of the fixed scroll 2 combined with the swinging scroll 3 is shown in FIGS. 13 and 14, and the position and size of its discharge port will be described in particular.

In these FIGS. 13 and 14, the fixed scroll 2 has fixed scroll teeth 29,
This fixed scroll tooth 29 is made up of a fixed scroll base plate 30 which is protruded from one surface corresponding to the oscillating scroll tooth 6, and is located at the following positions:
A discharge port 31 having a certain shape and size is formed. Here, the fixed scroll teeth 29 have a tooth height h equal to that of the oscillating scroll teeth 6, and the discharge port 31 is eccentric from the center point by a distance c and has a diameter d.

In this configuration of the fixed scroll 2 , as is clear from FIG. 2, the diameter d of the discharge port 31 is made smaller than at least the scroll tooth thickness t, and is large enough to seal the discharged fluid. In order to completely discharge the fluid in the compression chamber 4 (FIG. 2), its center must be on the base line N to N', and the point p on the inner circumference must be in contact with the innermost edge of the fixed scroll tooth 29.

In other words, the requirements for the specifications of the discharge port 31 are as follows:
It is eccentric by (a/2-t≦c<a-t/2), and its center is on the base line N~N' that connects the center of the base plate and the innermost edge of the scroll tooth, and the point p on the inner circumference of the opening is Occupies a position adjacent to the innermost edge of the scroll teeth, and
It is nothing but a circular shape with a diameter d (d=a-t-2c or 0<d≦t).

One embodiment of a scroll compression mechanism formed by assembling each of the above-mentioned components is shown in FIGS. 15 and 1.
As shown in FIG. 6, a cylinder 32 is disposed on the outer edge of the flange of the main body 13 , a suction port 33 is formed in the cylinder 32 to communicate with a suction space 34, and the fixed scroll 2 is aligned with the cylinder 32 . They are connected by bolts 36 through bolt holes 35, and this cylinder 32 also plays the role of adjusting and setting the axial height and distance between the fixed and swinging scrolls 2 and 3 . P-P′,
Q-Q' is the baseline.

Further, FIG. 17 shows a scroll compressor of a closed type in which an electric motor is incorporated into the scroll compression mechanism constructed in this manner.

FIG. 17 shows a scroll compressor according to an embodiment of the so-called high-pressure shell type in which the inside of the closed shell is maintained at the discharge side pressure.
In FIG. 7, the rotor 37 constituting the electric motor has an end ring 38 and a balance weight 39, as is also clear from FIG.
0 has a coil end 41, which forms a so-called squirrel-cage induction motor, and a mounting flange 43 provided around the upper inner side of a shell 42 that seals the whole is equipped with the scroll compression mechanism described above. At the same time, a suction pipe 44 introduced through the shell 42 is connected to the suction port 33, and a discharge pipe 45 is taken out from the shell 42, and the mounting flange 43 is connected to the shell inner space. Communication port 46 that communicates with 47
A lubricating oil 48 is stored at the inner bottom of the shell. And the lead wire 4 of the stator 40
9 is taken out to the outside of the shell via a hermetic terminal 50, and this stator 40 is fixed to the inner surface of the shell 42 through a gap 51, and the rotor 37
has a mounting hole 53 in its center so that it is opposed to the stator 40 via an air gap 52.
is fixed to the mounting portion 26 of the crankshaft 17 by, for example, shrink fitting.

Therefore, in the embodiment shown in FIG. 17, when the crankshaft 17 is driven to rotate by energizing the electric motor,
Through the shaft 8 rotatably fitted in the eccentric hole 18, the swinging scroll 3 is guided by the guide pin 12 whose recess 9 is loosely engaged, thereby performing the swinging motion shown in FIG. The gas flowing from the suction pipe 44 to the suction space 34 is sucked into the compression chambers 4 and 5.
The compressed air can be compressed and discharged from the discharge port 31 into the shell internal space 47, and can be led out from the discharge pipe 45.

However, during the compression operation of the lever, the lubricating oil 48 stored in the inner bottom of the shell is pumped through the oil holes and oil grooves 19 to 23, as shown by the single arrow, due to the discharge pressure acting in the shell inner space 47. 27 to each lubricating part, reducing loss due to wear on sliding surfaces, sealing between the suction space 34 and the shell internal space 47, and supplying water to the suction space 34 with a certain degree of pressure loss. The infiltrated lubricating oil is absorbed into the fixed and oscillating scroll teeth 29, 6 along with the suction gas.
The air is discharged into the shell inner space 47 with a seal formed between the two, separated from the compressed gas, and returned to the inner bottom of the shell. That is, in this way, oil lubrication, oil sealing, and oil separation effects are performed by pumping using differential pressure. In particular, during compression operation, the swing side scroll 3 has its base plate 7 and the thrust bearing surface 1 of the main body 13 due to the compression action in the compression chambers 4 and 5.
A thrust load is generated between the oil groove 22 and the oil groove 22.
The load can be reduced by applying oil pressure to the engine.

The balance weight 39 is attached to the crankshaft 17
The oscillating scroll 3, which performs eccentric movement around the rotation center J, is balanced, and the balancer 10 aligns the center of gravity of the oscillating scroll 3 with the axial center K of the oscillating scroll 3. Therefore, the static and dynamic balance of the drive system with respect to the rotation center J of the crankshaft 17 is maintained, and vibrations are suppressed.

(Effects of the Invention) As described above, in this invention, the balancer is placed on the scroll base plate of the rocking scroll at a position that does not interfere with the operation so as to align the center of gravity of the rocking scroll with the axis center of the rocking scroll. Since a balance weight is provided on the crankshaft for balancing the oscillating scroll, the drive system including the oscillating scroll and the crankshaft can be perfectly balanced and vibrations can be suppressed.

[Brief explanation of drawings]

Fig. 1 is an explanatory diagram of a scroll formed by sequentially connecting semicircular arcs with different radii in a scroll shape, Fig. 2 is an operational diagram of a scroll compression mechanism constructed by mutually combining a set of scrolls as described above, and Fig. 3 4 is a plan view and a bottom view of the swinging scroll, and FIGS. 5 and 6 are EE' and FH-
Each sectional view of the G' section, FIG. 7 is a longitudinally sectional front view of the main parts showing the support and swing mechanism of the swinging side scroll, FIG. 8 is a plan view of the same supporting part, and FIG. 9 is the swing mechanism. 10, 11 and 1
Figure 2 is a side, cross-sectional, and end view of the crankshaft, Figure 13 is a plan view of the stationary scroll, Figure 14 is a sectional view taken along line N-N' in Figure 13, and Figures 15 and 16 are scroll compression. FIG. 17 is a side cross-sectional view and a plane cross-sectional view of the P-P' and Q-Q' portions according to an embodiment of the mechanism; FIG. 17 is a vertical cross-sectional view showing a scroll compressor according to an embodiment of the high-pressure shell type; FIG.
The figure is a perspective view showing an electric motor rotor combined with a crankshaft. 1 ...Scroll, 2 and 3 ...Fixed side and swing side scroll, 4, 5...Compression chamber, 6...
Oscillating scroll tooth, 7...Occillating scroll base plate,
8... Rocking scroll shaft, 9... Rocking guide recess, 10... Rocking scroll balancer, 12...
Guide pin, 13 ...Main body, 14...Guide pin hole, 15...Thrust bearing surface, 16...Shaft hole, 1
7...Crankshaft, 18...Eccentric hole, 19-23
... Oil hole, 24 ... Sliding ring, 25 ... Sliding ring with eccentric hole, 26 ... Motor mounting part, 27 ...
... Oil groove, 28 ... Flange, 29 ... Fixed scroll teeth, 30 ... Fixed scroll base plate, 31 ... Discharge port, 32 ... Cylinder, 33 ... Suction port, 34 ...
...Suction space, 37...Rotor, 39...Balance weight, 40...Stator, 42...Ciel,
43...Mounting flange, 44...Suction pipe, 45
...Discharge pipe, 46...Communication port, 47...Shell interior space, 48...Lubricating oil.

Claims (1)

[Claims] 1. A fixed scroll 2 having a scroll base plate 30 and scroll teeth 29 provided on this base plate 30, and a fixed scroll having a scroll base plate 7 and scroll teeth 6 provided on this base plate 7. 2, the compression chambers 4 and 5 are formed between the two scroll teeth 29 and 6, and the compression chambers 4 and 5 are moved along the scroll teeth 29 of the fixed scroll 2. The scroll 3 is provided with a crankshaft 17 whose shaft center is eccentric from the shaft center of the swinging scroll 3 and which applies a motion force to the swinging scroll 3, and the crankshaft 17 is provided with a crankshaft 17 whose shaft center is eccentric from the shaft center of the swinging scroll 3 and which applies a motion force to the swinging scroll 3. A balancer is provided on the scroll base plate 7 of the oscillating scroll 3 at a position that does not inhibit the operation so as to match the axis center of the scroll 3, and a balancer is provided on the crankshaft 17 to balance the oscillating scroll 3. A scroll compressor characterized by a weight.