JP3865552B2 - Peripheral drive double-tooth scroll compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll compressor used for an air compressor or the like.
[0002]
[Prior art]
In general, during operation, the scroll compressor is displaced in the thrust direction while turning orbiting due to the effect of misalignment due to gas force or assembly and combination of parts, and is making a slewing motion.
[0003]
A double-tooth type scroll compressor is conceivable as a means for supplying a larger volume of discharge air than a conventional scroll compressor for air compression. In particular, an oil-free scroll compressor that does not supply oil to the compression chamber is suitable for a peripheral drive type compressor structure in which two crankshafts are provided on both sides of the wrap from the viewpoint of bearing protection because the lap center is hot. ing.
[0004]
This outer peripheral drive double-tooth type scroll compressor uses a dust seal in order to avoid mixing of cooling air and compressed air. Dust seal in the prior art is the annular cross-section rectangle, but they are often one location cleaved in consideration of assemblability, consisting members singular. Further, the dust seal itself is usually not elastic, and when worn, cooling air from the outside air and compressed air from which dust and the like are removed through a filter are mixed.
[0005]
Therefore, an elastic member (hereinafter referred to as a backup tube) is disposed on the back side of the dust seal, and this pushes up the dust seal even if the dust seal is worn, thereby preventing mixing of cooling air and compressed air. The backup tube is also formed of a single member.
[0006]
[Problems to be solved by the invention]
However, for example, in the case of an outer peripheral drive double-tooth type scroll compressor, there is a scroll compressor that is held by two shafts on the outer periphery of the scroll wrap. In this case, the end plate surface of the orbiting scroll is caused to vibrate by being displaced in the axial direction with the line connecting the axes as the center line, which may eventually cause the scroll compressor to break.
[0007]
On the other hand, if the pressing force against the end plate surface of the dust seal on the outer periphery of the wrap or the tip seal disposed at the tip of the scroll wrap is increased in order to suppress this, the frictional force increases and the power greatly increases. A point arises.
[0008]
The present invention has been made in view of the above-described problems of the prior art, and an object of the present invention is to provide a scroll compressor that reduces axial displacement of the orbiting scroll while minimizing an increase in power. .
[0009]
[Means for Solving the Problems]
To achieve the above object, the outer peripheral drive both toothed type scroll compressor according to the invention according to claim 1, the orbiting scroll of the two teeth, and left and right stationary scroll facing thereto, for driving the orbiting scroll The left and right fixed scrolls that slide with the wrap surface of the orbiting scroll to prevent dust from entering a compression chamber formed by meshing the main and auxiliary crankshafts with both the orbiting and fixed scrolls. In the outer peripheral drive double-tooth scroll compressor comprising a dust seal attached to an annular dust strap provided on each side and a backup tube on the back side of the dust seal for pressing the dust seal against the sliding surface, the main and auxiliary crankshafts a diameter line of the farthest have the da strap from the held portion by the pivot At the site where the crawl displacement becomes relatively large, so as to suppress the displacement of the orbiting scroll in the site, said at backup tube the site and its vicinity in the middle of the O-ring was composed of hollow O-ring in the other site It is characterized by this.
[0010]
An outer peripheral drive double-tooth scroll compressor according to the invention according to claim 2 is a double-toothed orbiting scroll, left and right fixed scrolls facing each other, main and auxiliary crankshafts for driving the orbiting scroll, To prevent dust from entering the compression chamber formed by meshing both the swivel and fixed scrolls, annular dust straps respectively provided on the left and right fixed scrolls that slide on the wrap surface of the orbiting scroll. In the outer peripheral drive double-tooth scroll compressor having a dust seal attached thereto, the displacement of the orbiting scroll is relatively on the diameter line of the dust lap farthest from the portion held by the main and auxiliary crankshafts. In the part that becomes large, the dust sheet is controlled so as to suppress the displacement of the orbiting scroll in the part. Was divided into a plurality of said at site and the vicinity thereof is characterized in that it has configuration by changing the thickness or material so as to increase the surface pressure partially in the site than other sites.
[0011]
An outer peripheral drive double-tooth type scroll compressor according to the invention according to claim 3 is a double-toothed orbiting scroll, left and right fixed scrolls facing each other, main and auxiliary crankshafts for driving the orbiting scroll, To prevent dust from entering the compression chamber formed by meshing both the swivel and fixed scrolls, annular dust straps respectively provided on the left and right fixed scrolls that slide on the wrap surface of the orbiting scroll. In the outer peripheral drive double-tooth type scroll compressor provided with the attached dust seal, on the diameter line of the dust trap farthest from the portion held by the crankshaft, in the portion where the displacement of the orbiting scroll is relatively large, so as to suppress the displacement of the orbiting scroll in the site, convex taper to said dust seal Or it is characterized in the provision of the protrusion.
[0012]
[Action]
In the prior art, for example, in a single-tooth scroll compressor consisting of one orbiting scroll and one fixed scroll, the outer peripheral side of the scroll wrap is supported using three auxiliary cranks in order to suppress the gas force in the thrust direction. Yes. In this case, the portion held by the auxiliary crank has a small displacement of the orbiting scroll, but the middle line portion between the shafts has a large thrust displacement of the orbiting scroll. On the other hand, in the outer peripheral drive double-tooth type scroll compressor, since the scroll wrap is provided on both sides of the orbiting scroll, the gas force in the thrust direction is theoretically canceled. For this reason, there are only two shafts for driving in the thrust direction, and the thrust displacement of the orbiting scroll at the middle line portion is larger than that of the single-tooth type.
[0013]
The present invention is to reduce the axial displacement of the orbiting scroll in the outer peripheral drive double-tooth scroll compressor.
[0014]
A first aspect of the present invention is to provide a backup tube as described in claim 1 and to play a role of suppressing vibration of the orbiting scroll. The second aspect of the present invention is to configure the dust seal as described in claim 2 and to play a role of suppressing vibration of the orbiting scroll.
[0015]
According to a third aspect of the present invention, there is provided a dust seal configured as described in claim 3 to play a role of suppressing vibration of the orbiting scroll.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
The embodiments of the present invention will be described with reference to FIGS.
[0017]
FIG. 1 shows a cross-sectional view of a scroll compressor body block in which the orbiting scroll has a double-tooth structure. This scroll compressor having a double-tooth structure includes a turning scroll 1 provided with scroll wraps on both sides of a body plate, a left fixed scroll 2 provided with a scroll wrap that forms a compression working chamber by being combined with a wrap of the turning scroll 1, and a right scroll. A fixed scroll 3, a main crankshaft 4 that drives the orbiting scroll 1, an auxiliary crankshaft 5 that rotates synchronously with the main crankshaft 4, a timing belt 6 that synchronizes the main crankshaft 4 and the auxiliary crankshaft 5, and a timing pulley 7 A V pulley 8 that drives the main crankshaft 4 by power from the motor and a discharge port 9 that discharges the compressed fluid are configured.
[0018]
By transmitting the power from the motor (not shown) to the V pulley 8 by the V belt, the main crankshaft 4 is rotated, and the auxiliary crankshaft 5 is synchronously rotated by the timing belt 6 and the timing pulley 7 for synchronization. Drive. Thus, the orbiting scroll 1 performs an eccentric motion without rotating with respect to the left fixed scroll 2 and the right fixed scroll 3. The gas fluid is sucked from a suction port (not shown), compressed as the rotation proceeds, and discharged from the discharge port 9.
[0019]
FIG. 2 shows a fixed scroll with a dust seal. The dust seal 10 is disposed in a groove formed at the tip of the dust wrap 12 disposed on the outer peripheral side of the scroll wrap 11 to prevent the cooling air from entering the scroll wrap.
[0020]
3 and 4 show a first embodiment of the present invention. For example, a solid O-ring 14 is inserted on the back side of the dust seal 15 as shown in FIG. 3 only in the portion A of FIG. 2 on the diameter line of the annular dust wrap 12, and the other portions are shown in FIG. Thus, for example, a hollow silicon tube is inserted as the backup tube 16 on the back side of the dust seal 15. Experiments have confirmed that the portion A of FIG. 2 is farthest from the portion held by the shaft, so that the displacement of the orbiting scroll 1 is the largest.
[0021]
By inserting a solid O-ring only in the A portion, the pressing force is partially increased and the displacement of the orbiting scroll 1 is reduced. Thereby, the displacement of the turning scroll 1 can be reduced by about 80%. In this method, the increase in surface pressure is partial, so there is almost no increase in power. Alternatively, a hollow silicon tube may be installed around the entire circumference, and a solid O-ring may be installed only on the A portion.
[0022]
If the backup tube 16 on the back side of the dust seal 15 is made a solid O-ring or the thickness of the dust seal 15 is increased to increase the pressing force of the dust seal 15 as a whole, the power increases by about 10%. .
[0023]
In the second embodiment of the present invention, the dust seal 15 is divided at the portion A in FIG. 2 and other portions, and the surface pressure at the portion A applied to the orbiting scroll is partially increased by changing the thickness or material. The same effect as the first embodiment is obtained.
[0024]
5 and 6 show a third embodiment of the present invention. The dust seal 15 corresponding to the portion A in FIG. 2 is provided with a partial protrusion as shown in FIG. 5 or a partial taper as shown in FIG. The surface pressure at the part is partially increased to obtain the same effect as in the first embodiment.
[0025]
The second and third embodiments can be realized without using the backup tube 16.
[0028]
In the above-described embodiment, the A portion that is farthest from the portion held by the shaft and has the largest displacement of the orbiting scroll 1 is specified. However, a configuration in which the A portion is applied to two places in the vicinity of the portion that sandwich the A portion is applied However, the same effect can be obtained.
[0029]
【The invention's effect】
According to the present invention, the axial displacement of the orbiting scroll can be reduced while minimizing an increase in power consumption by partially increasing the surface pressure of the dust seal applied to the orbiting scroll.
[Brief description of the drawings]
FIG. 1 is an overall cross-sectional view of a scroll compressor according to an embodiment of the present invention.
FIG. 2 is a fixed scroll according to an embodiment of the present invention.
3 is a dust seal holding structure according to the first embodiment of the present invention. FIG. 4 is a dust seal holding structure according to the first embodiment of the present invention. FIG. 5 is a dust seal holding structure according to the third embodiment of the present invention. ] Dust seal structure of third embodiment of the present invention
DESCRIPTION OF SYMBOLS 1 ... Orbiting scroll 2 ... Left fixed scroll 3 ... Right fixed scroll 4 ... Main crankshaft 5 ... Auxiliary crankshaft 6 ... Timing belt 7 ... Timing pulley 8 ... V pulley 9 ... Discharge port 10 ... Dust seal 11 ... Scroll wrap 12 ... D Strap 14 ... O-ring 15 ... Dust seal 16 ... Backup tube 17 ... Fixed scroll

Claims (3)

A double-toothed orbiting scroll, left and right fixed scrolls facing each other, main and auxiliary crankshafts for driving the orbiting scroll, and a compression chamber formed by engaging both the orbiting and fixed scrolls. In order to prevent intrusion of dust, a dust seal attached to an annular dust trap provided on each of the left and right fixed scrolls that slides on the wrap surface of the orbiting scroll, and a dust seal on the back side of the dust seal on the sliding surface In the outer peripheral drive double-tooth scroll compressor with a backup tube for pressing,
A on the main and diameter lines farthest the Das trap from the held portion by the auxiliary crankshaft, at the site where the displacement of the orbiting scroll is relatively large, so as to suppress the displacement of the orbiting scroll in the site An outer peripheral drive double-tooth scroll compressor characterized in that the back-up tube is constituted by a solid O-ring at and near the part and a hollow O-ring at the other part. A double-toothed orbiting scroll, left and right fixed scrolls facing each other, main and auxiliary crankshafts for driving the orbiting scroll, and a compression chamber formed by engaging both the orbiting and fixed scrolls. In the outer peripheral drive double-tooth scroll compressor provided with a dust seal attached to an annular dust trap provided on each of the left and right fixed scrolls sliding with the lap surface of the orbiting scroll to prevent intrusion of dust,
On the diameter line of the dust lap farthest from the portion held by the main and auxiliary crankshafts, at a portion where the displacement of the orbiting scroll is relatively large, so as to suppress the displacement of the orbiting scroll at the portion, periphery drive, characterized in that the dust seal is divided into a plurality, was constructed by changing the thickness or material so as to increase the surface pressure partially in the site as compared with the site and the vicinity thereof in other portions Double-tooth scroll compressor. A double-toothed orbiting scroll, left and right fixed scrolls facing each other, main and auxiliary crankshafts for driving the orbiting scroll, and a compression chamber formed by engaging both the orbiting and fixed scrolls. In the outer peripheral drive double-tooth scroll compressor provided with a dust seal attached to an annular dust trap provided on each of the left and right fixed scrolls sliding with the lap surface of the orbiting scroll to prevent intrusion of dust,
A convex shape is formed on the dust seal so as to suppress the displacement of the orbiting scroll at the portion where the displacement of the orbiting scroll is relatively large on the diameter line of the dust trap farthest from the portion held by the crankshaft. An outer peripheral drive double-tooth type scroll compressor provided with a tapered portion or a protruding portion.

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