JP3547387B2 - Scroll compressor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a scroll compressor used as an air compressor or a compressor for refrigeration and air conditioning, and more particularly to a scroll compressor having a wrap on both sides suitable for realizing a large-sized scroll compressor.
[0002]
[Prior art]
The air-cooled oil-less scroll compressor disclosed in Japanese Utility Model Laid-Open Publication No. 63-136281 is a single type in which a compression chamber is formed only on one side of an orbiting scroll. When it is increased, there is a problem that the thrust load becomes large and it is difficult to commercialize the product. For this reason, only a product of 5.5 kW or less has been commercialized.
[0003]
In order to solve this problem, a double scroll compressor in which scroll wraps (compression chambers) are provided on both sides of the end plate of the orbiting scroll is also known, and some have realized a capacity of 5.5 kW or more. Known examples of this type include those described in, for example, JP-A-57-76202 and Japanese Utility Model Laid-Open No. 5-87285.
[0004]
[Problems to be solved by the invention]
In a non-lubricating scroll compressor (air compressor), the gas temperature rises to about 200 ° C. and becomes high temperature, so that it is necessary to efficiently perform this cooling. That is, the oilless scroll compressor has a high temperature (about 200 ° C.) because a cooling refrigerant such as oil is not put into the compression chamber of the scroll. As a result, the orbiting scroll and the fixed scroll are thermally deformed, and there is a problem that the rotation becomes impossible due to an increase in the gap and the contact between the scrolls.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a scroll compressor that can efficiently cool a compressor in an oilless double scroll compressor to improve performance and prevent contact of a scroll due to thermal deformation.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a orbiting scroll having one end plate and spiral wraps provided on both axial sides of the end plate, respectively, and is disposed on each of the left and right sides of the orbiting scroll. wherein the one end plate each swivel scroll - Rurappu and meshing one of the two fixed scroll having a spiral wrap - le and the left and right fixed scroll - rotating support through respective bearings on the outer peripheral side of the wrap of the Le And a crankshaft and an auxiliary crankshaft which engage the outer peripheral side of the wrap of the orbiting scroll through a bearing to orbit the orbiting scroll, and a phase of a lap surface between the fixed scroll and the orbiting scroll. correctness with respect to the fixed scroll on both sides of the connect to the crankshaft in a state of being matched with the auxiliary crankshaft orbiting scroll A timing belt for turning movement phase, the left and right fixed scroll - a plurality of cooling fins formed on the outer surface le, a forced supply cooling fan cooling medium along the cooling fins, the fixed scroll And a discharge port formed in the oil-free scroll compressor .
[0007]
In a non-lubricating screw compressor, the compression chamber is heated to a high temperature (about 200 ° C.) because no cooling medium is supplied during the compression process. It has a cooling fin on the outer surface of the left and right of the fixed scroll, in the present invention so as to forcibly cooled by a cooling fan, the cooling medium can be uniformly flowed by the cooling fan, the cooling medium is sucrose - longitudinal Le As a result, the heat generated during the compression process inside the scroll and the cooling medium can be efficiently exchanged with each other, and the temperature of the discharged gas can be sufficiently reduced. As a result, the turning and the thermal deformation of the fixed scroll are prevented, and the performance is reduced and the scrolls are prevented from contacting each other due to the increase in the gap.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The basic components of the present invention include a fixed left scroll, a fixed right scroll, an orbiting scroll, and a crankshaft and an auxiliary crank that constitute these scrolls. In order to align the left and right fixed scrolls and the orbiting scrolls, basically each of them is provided with a dowel hole and assembled based on this. That is, the positioning of the scroll wrap surface of the left fixed scroll and the right fixed scroll is determined by the knock hole of the outer peripheral flange provided for the fixed scroll positioning. The orbiting scroll and the right fixed scroll are positioned by a knock hole provided on each of the crankshaft of the right fixed scroll and the shaft end of the auxiliary crank, and a bearing cover for holding the bearings of the two cranks. (Assembled with the dowel pin positioned with respect to the dowel)). That is, a knocking hole is provided at a position synchronized with the eccentric top position of the crankshaft and the auxiliary crank, and the knocking holes are connected to each other by a knocking pin, and when the eccentricity of the crankshaft and the auxiliary crank comes to the top, the orbiting scroll. And the fixed scroll is set to the minimum torque position. As a result, the phases of the wrap surfaces of the fixed scroll and the orbiting scroll can be matched, and in this state, by connecting the crankshaft and the auxiliary crank with the timing belt, the orbiting scroll can be moved on both sides thereof. With respect to the fixed scroll, it is possible to make a revolving motion with the correct phase, then fix the fixing bolt on the outer peripheral part of the fixed scroll, remove the bearing cover, the knock pin that has positioned the crankshaft and the auxiliary crank, Complete the assembly. As described above, it is possible to realize a double scroll compressor capable of exhibiting a function as a compressor while smoothly rotating.
[0009]
A double scroll compressor having orbiting scrolls having the same wrap shape on both the left and right sides has a configuration in which the left and right pressures form the same compressed state in the same phase. A cooling fin with a large surface area is attached to the outer surface of the left fixed scroll, and a cooling fin is similarly provided on the outer surface of the right fixed scroll. The cooling fin is generated during the scroll compression process by the forced supply of cooling air from the external cooling fan. The compressor is forcibly cooled to lower the discharge gas temperature. As a result, the cooling efficiency of the oilless double scroll compressor can be increased, the performance can be improved, and contact due to thermal deformation of the scroll can be prevented, so that a large capacity oilless scroll compressor can be realized.
[0010]
Since the double scroll having the wrap surface on both sides of the orbiting scroll has compression chambers on both sides, the outer diameter of the scroll can be made smaller than that of the single scroll compressor in which the wrap is provided only on one side of the orbiting scroll. Since the compression chamber has the same pressure, there is no disadvantage that a large thrust load, which is one of the drawbacks of the scroll compressor, acts on the head plate surface. Particularly in the case of an oilless scroll compressor, a double scroll that does not receive a thrust load because it rotates without lubrication between the turning and the fixed scroll is an optimal compressor as an oilless type.
[0011]
Hereinafter, a specific embodiment of the present invention will be described with reference to FIGS. The flow of the fluid to be compressed passes through the suction port 24 and the suction passage 23, is sucked into a compression chamber formed by the wrap surface of the orbiting scroll 1, the left fixed scroll 2 and the right fixed scroll 3, and as the rotation proceeds, Is increased to a predetermined pressure, and is discharged from the discharge port 22. In the drive system for orbiting the orbiting scroll 1, power is first transmitted from a power source such as a motor to the V pulley 6 to rotate the crankshaft 4. A load-side bearing 8, a crank bearing 9, and a non-load-side bearing 10 are attached to the crankshaft 4, and support a gas load and the like during compression by these.
[0012]
On the other hand, the auxiliary crank 5 is synchronously rotated by the crankshaft 4 via the timing belt 7. A load-side bearing 11, a crank bearing 12, and a non-load-side bearing 13 are attached to the auxiliary crank 5, similarly to the crankshaft 4, and support the auxiliary crank 5. Further, bearing covers 14 and 15 are attached to the right fixed scroll 3 so as to face one shaft end surfaces of the crankshaft 4 and the auxiliary crank 5. The bearing covers 14 and 15 fix the anti-load side bearings 10 and 13 in the axial direction of the right fixing scroll 3. The orbiting scroll 1 attached to the crankshaft 4 and the auxiliary crank 5 via the crank bearings 9 and 12 orbits by a stroke corresponding to the crank radius of the crankshaft 4 and the auxiliary crank 5, and has the volume of the left and right fixed scrolls 2 and 3. The suction fluid is compressed by the change.
[0013]
In this embodiment, the following configuration is adopted to facilitate the alignment of the wrap surfaces of the orbiting scroll 1 of the double scroll compressor having left and right wrap surfaces, the left fixed scroll 2 and the right fixed scroll 3. That is, the left fixed scroll 2 and the right fixed scroll 3 are formed by processing the left and right fixed scrolls with reference to the processing holes (knock holes) 20a and 20b for inserting the knock pins 20 of the fixed scroll. At the time of assembling, knock pins 20 are driven into the knock holes 20a and 20b of the fixed scroll, whereby the left and right fixed scroll can be positioned with high accuracy.
[0014]
The positioning of the right fixed scroll 3 and the orbiting scroll 1 is performed as follows. That is, the knock holes 3a and 3b are formed in the outer peripheral portion of the portion where the non-load-side bearings 10 and 13 of the right fixed scroll 3 are mounted. The knock hole 3a is formed on the crankshaft 4 side, and the knock hole 3b is formed on the auxiliary crank 5 side. Knock holes 14a and 15a are machined in the bearing covers 14 and 15 so as to synchronize with them, and the right fixed scroll 3 and the bearing covers 14 and 15 are knocked in the knock holes 3a and 14a and the knock pins 3b and 15a respectively. The bearing covers 14 and 15 are positioned with high accuracy on the right fixed scroll 3 by inserting and positioning the bolts 16 and 18 and fixing them with bolts.
[0015]
At the shaft end of the crankshaft 4, a knock hole 4 a that is concentric at a position where the crank radius of the crankshaft 4 is maximized is provided. Similarly, a knock hole 5a that is concentric at the position where the flank radius of the auxiliary crank 5 is maximized is also provided at the shaft end of the auxiliary crank 5. That is, in FIGS. 1, 3, and 4, the knock holes 4a and 5a are formed so that the knock holes 4a and 5a are also positioned at the highest positions when the crank portions of the cranks 4 and 5 are the highest positions. When the knock holes 4a and 5a on the shaft side are at the highest position, the bearing covers 14 and 15 are also provided with knock holes 14b and 15b at positions synchronized with the knock holes. At the time of assembling, the knock pins 17 (crankshaft side) and 19 (auxiliary crank side) are inserted into these knock holes 4a and 14b and 5a and 15b, respectively, so that the crankshafts of the crankshaft 4 and the auxiliary crank 5 are both uppermost. In this state, the orbiting scroll 1, the left fixed scroll 2 and the right fixed scroll 3 are positioned so as to be in an optimum assembled state. In this state, the crankshaft 4 and the auxiliary crank 5 are connected with the correct phase by the timing belt 7. After the assembly is completed, the compressor can be operated by removing the crankshaft side knock pin 17 and the auxiliary crank side knock pin 19. Reference numeral 21 denotes a mounting bolt for tightening and fixing the outer peripheral flange portions of the left fixed scroll 2 and the right fixed scroll 3, and bolts 35 and 36 tighten and fix the bearing covers 14 and 15 to the fixed scroll 3. .
According to this embodiment, highly accurate positioning of the fixed scroll and the orbiting scroll can be easily performed by the respective knock pins.
[0016]
Further, in this embodiment, in the double scroll having the compression chambers on both sides of the orbiting scroll, the heat generated in the compression process is efficiently cooled in the fixed scrolls 2 and 3 so as to lower the discharge gas temperature. . That is, as shown in FIG. 1, a left cooling fin 30 having a large surface area is attached to the outer surface of the left fixed scroll 2, and a right cooling fin 31 is similarly attached to the outer surface of the right fixed scroll 3. Each of the cooling fins is formed integrally with the fixed scrolls 2 and 3, and the cooling fins 30 and 31 are formed in a direction connecting the crankshaft 4 and the auxiliary crank 5, that is, in a vertical direction. This allows the cooling fins to be formed in the longitudinal direction of the compressor.
[0017]
FIG. 2 shows the shape of the right cooling fin 31 of the right fixed scroll 3. A duct mounting seat 32 for forming a passage for a cooling medium (for example, cooling air such as cooling air) with the cooling fins is attached to an outer frame portion of the right cooling fin 31, and a duct (not shown) is attached thereto. In this duct, cooling air is forced to flow from an external fan (not shown) from a cooling air inlet 33 to a cooling air outlet 34 to exchange heat with the compressor generated inside the scroll compressor, thereby lowering the discharge gas temperature. I try to make it. In this embodiment, since the cooling fins are formed in the longitudinal direction of the compressor, heat exchange with the cooling air is efficiently performed, the duct passage area can be reduced, and the turning and the fixed scroll can be prevented from being thermally deformed. .
[0018]
According to the embodiment described above, the following effects can be obtained.
(1) In a double scroll compressor having a wrap surface on both sides, high precision assembly with an optimum gap on the wrap surface can be easily secured simply by machining the fixed scroll, orbiting scroll, and crankshaft with high precision. Easy. Thereby, the performance of the scroll compressor can be improved by 5 to 10%.
(2) There is no variation in assembly work of the scroll compressor, and variations in compressor performance can be eliminated.
(3) The assembling of the fixed scroll and the orbiting scroll of the scroll compressor becomes easy, so that the number of assembling steps can be reduced by about 30%.
(4) Assembling of the scroll compressor becomes possible irrespective of the skill of the operator, contact of the wrap surface of the scroll is prevented, and reliability can be greatly improved.
(5) By attaching cooling fins on both sides of the fixed scroll, the discharge gas temperature of the oilless scroll compressor can be reduced to 200 ° C. or less, and turning and thermal deformation of the fixed scroll can be prevented. Therefore, the gap between the scrolls can be reduced, and the performance can be further improved by about 10%.
(6) Since the surface temperature of the turning and fixed scrolls can be reduced, contact between the scrolls can be prevented, and the reliability can be improved.
(7) Due to the effects of the above (5) and (6), an oilless scroll compressor having an output of 7.5 kW or more can be realized.
[0019]
【The invention's effect】
According to the present invention, since the cooling fins are provided, the compressor in the oilless double scroll compressor can be efficiently cooled to improve the performance, and the contact of the scroll compressor wrap due to thermal deformation can be prevented. There is an effect that can be done.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing one embodiment of a scroll compressor of the present invention.
FIG. 2 is a right side view of FIG.
FIG. 3 is an enlarged front view of the crankshaft 4 shown in FIG.
FIG. 4 is an enlarged front view of the auxiliary crank 5 shown in FIG.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 orbiting scroll, 2 fixed left scroll, 3 fixed scroll right, 4 crankshaft, 5 auxiliary crank, 6 V pulley, 7 timing belt, 8, 11 load bearing, 9, 12 crank Bearings 10, 13 ... bearings on the non-load side, 14, 15 ... bearing covers, 16, 17, 18, 19, 20 ... knock pins, 3a, 3b, 4a, 5a, 14a, 14b, 15a, 15b, 20a, 20b ... knock holes, 21 ... mounting bolts, 22 ... discharge port, 23 ... suction passage, 24 ... suction port, 30 ... left cooling fin, 31 ... right cooling fin, 32 ... duct mounting seat, 33 ... cooling air inlet, 34 ... Cooling air outlet, 35, 36 ... bolt.

Claims (1)

A orbiting scroll having one end plate and spiral wraps provided on both sides of the end plate in the axial direction, and one end plate and the orbiting scroll respectively disposed on the left and right sides of the orbiting scroll. Two fixed scrolls having one spiral wrap meshing with the wrap,
A crank that is rotatably supported on the outer peripheral side of the wrap of the left and right fixed scrolls via bearings, and engages with the outer peripheral side of the wrap of the orbiting scroll via bearings to orbit the orbiting scroll. A shaft and an auxiliary crankshaft;
A timing belt for connecting the crankshaft and the auxiliary crankshaft in a state where the phases of the wrap surfaces of the fixed scroll and the orbiting scroll are matched with each other and causing the orbiting scroll to orbit with the correct phase with respect to the fixed scrolls on both sides thereof. When,
A plurality of cooling fins formed on the outer surfaces of the left and right fixed scrolls;
A cooling fan for forcibly supplying a cooling medium along the cooling fins ,
Oil-free scroll compressor, characterized in that a pre SL formed fixed scroll discharge port.

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