JP2000186681A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make an acting fluid flow from a suction port for a shortest distance and in a laminar flow condition by arranging the suction port communicating with an intake passage at an outer wall of a fixing scroll, and arranging an intake opening port of a suction port in the vicinity of a winding terminal end of a slewing scroll lap. SOLUTION: When a driving shaft is rotated, revolution motion is carried out by a slewing scroll serving an eccentric size (e) with respect to a slewing center R as radius. By this motion, an action fluid S flows into an intake passage 22 through a suction port 26, an intake opening 27, and an intake chamber 28, and flows into an intake action space A formed by engaging a fixing scroll lap with a slewing scroll lap 9. And it is pressurized in order, and is discharged from a discharge hole arranged on a center part of the fixing scroll. In this case, the suction port 26 is arranged on an outer wall of the fixing scroll 3, and the intake opening is arranged in the vicinity of a winding terminal end 20 of the slewing scroll lap 9 so as to improve intake efficiency.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid machine such as an industrial air compressor, a compressor for a refrigerator, a vacuum pump, and the like. The present invention relates to a scroll compressor which compresses or sucks a working fluid.

[0002]

2. Description of the Related Art Conventionally, as a scroll compressor of this type, as disclosed in Japanese Patent Application Laid-Open No. Sho 59-79085, a fixed scroll opposed to a half-turn portion from the end of the orbiting scroll wrap is known. In some cases, a side wall is provided with a suction chamber formed so as to always have a gap between the outer wall of the orbiting scroll wrap and a locus formed by the orbital movement.

Japanese Patent Application Laid-Open No. 64-8382 discloses that the final outermost ends of the fixed scroll and the orbiting scroll are positioned at the height of the center of engagement of the two scroll wraps. There is disclosed one in which two suction ports for sucking the fluid to be compressed are formed near the outer end.

In the above two conventional means, the working fluid suction passage is provided over the entire outer periphery of the fixed scroll wrap or the orbiting scroll wrap, and the working fluid suction port communicating with the working space formed by the two scroll wraps is also provided. Since it is provided at an intermediate position between the winding end of the orbiting scroll wrap and the winding end of the fixed scroll wrap or at the outermost end of the orbiting scroll wrap, the working fluid flowing into the suction passage through the suction port is provided. Then, during the process of flowing into the suction operation space, the suction passage is divided into two parts and flows into the suction passage.

Conventionally, generally, the sliding surface of a fixed scroll head plate with a revolving scroll head plate is disclosed in Japanese Unexamined Patent Publication No. 55-6 / 55.
As disclosed in Japanese Patent No. 4180 and Japanese Utility Model Laid-Open No. 2-145686, a circular seal ring or dust seal for sealing the working space and the outside is provided.
In this case, the center of the circular seal ring is set to the center of rotation of the orbiting scroll.

[0006]

In the case of the scroll compressor having the above-mentioned conventional structure, the suction passage is provided over the entire outer periphery of both scroll wraps. In addition to the possibility that the working fluid leaks to the suction passage side, the working fluid flowing from the suction port flows into the suction working space.
Flowing into the working space formed by the inner surface of the fixed scroll wrap, the outer surface of the orbiting scroll wrap, and the end plate and the working space formed by the outer surface of the fixed scroll wrap, the inner surface of the orbiting scroll, and the end plate; Become.

[0007] Therefore, the flow direction of one fluid flows in the forward direction with respect to the turning direction of the orbiting scroll, and the other fluid flows in the direction opposite to the turning direction of the orbiting scroll. As a result, in the suction chamber immediately after the suction port. A turbulent flow of the working fluid is likely to occur, and the flow resistance of the fluid from the suction port to the entrance of the working space is increased due to a long flow path of the fluid. The suction efficiency tends to decrease due to an increase in the temperature of the working fluid due to the thermal influence from the outer wall of the scroll, and there is a problem that the suction efficiency is particularly poor in the working space on the side opposite to the turning direction of the orbiting scroll.

As a countermeasure, it is conceivable to reduce the flow resistance of the working fluid by increasing the size of the suction passage in the outer circumferential direction of the scroll. In this case, the seal provided in the outer circumferential direction of the suction passage is considered. Since the distance from the ring becomes small and a sufficient sealing effect cannot be obtained, the diameter of the seal ring located at the center of the orbiting scroll must be increased. In this case, the outer shape of the end plate of the orbiting scroll naturally increases, and the overturning moment of the orbiting scroll increases. Therefore, the weight of the balance weight must be increased accordingly. As a result, there is a problem that the entire compressor becomes large. .

It is also conceivable to increase the number of working fluid suction ports communicating with the suction passage as in the above-mentioned conventional example.
In addition to an increase in the number of processing steps for the suction port, in particular, in the case of an oil-cooled compressor, a plurality of capacity control devices and air cleaners to be mounted on the suction port are required.

Accordingly, a first object of the present invention is to minimize the rise in the flow resistance and the suction temperature of the working fluid in the process from when the working fluid flows into the suction working space via the suction port through the suction passage. To prevent a decrease in the suction efficiency of the compressor.

It is a further object of the present invention to further improve the suction efficiency by allowing the working fluid to flow into the suction working space at the shortest distance from the suction port and in a laminar flow state.

It is a further object of the present invention to minimize the circumferential length of the suction passage adjacent to the working space to suppress leakage of fluid from the working space to the suction passage.

Further, the suction hole of the suction port is formed in a direction substantially perpendicular to the end plate of the fixed scroll to facilitate the processing of the suction port portion, and the outer wall space is effectively used to unload the device such as an unloader device or an air cleaner. To make the installation of auxiliary equipment easier and to make the whole compressor compact. Also,
The center of the dust seal formed on the end plate of the fixed scroll is decentered toward the suction passage with respect to the center of rotation of the orbiting scroll, and the inner wall of the suction passage is moved toward the outer periphery as much as possible to increase the width of the suction passage. In addition, it is another object of the present invention to reduce the outer dimensions of the fixed scroll in the opposite direction by 180 degrees by the eccentric dimension to reduce the overall dimensions of the compressor.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a fixed scroll having a fixed plate fixed to a casing, a spiral fixed scroll wrap standing upright to the fixed plate, In a scroll compressor having an orbiting scroll having an orbiting scroll wrap that meshes with a fixed scroll wrap to form an operation space, the orbiting scroll is configured to be capable of eccentric orbiting without rotating around the center of the drive shaft, and at one location on the outer wall of the fixed scroll. A suction port for the working fluid communicating with the suction passage is provided, and the suction opening of the suction port is disposed near the end of the winding of the orbiting scroll wrap.

It is preferable that the center of the suction opening of the suction port is disposed at a position substantially perpendicular to the outer peripheral surface at the end of the end of the orbiting scroll wrap.

Further, the suction passage provided in the fixed scroll is arranged so as to sandwich the center of the fixed scroll from the winding end of the fixed scroll wrap provided opposite to the circumferential end of the winding end of the orbiting scroll wrap. It is provided on the outer edge of the fixed scroll wrap over substantially a semicircle (claim 3).

Furthermore, it is preferable that a blow hole of a suction port provided on an outer wall of the fixed scroll is formed in a direction substantially perpendicular to a head plate of the fixed scroll.

[0018] A head plate fixed to the casing, a fixed scroll having a spiral fixed scroll wrap standing upright to the head plate, and a revolving scroll wrap meshing with the fixed scroll wrap to form a working space. In a scroll compressor configured to be capable of eccentric orbiting movement without rotating the orbiting scroll with respect to the drive shaft center,
A circular ring-shaped dust seal is provided on a sliding surface of the fixed scroll head plate with the orbiting scroll, and the center of the dust seal is eccentric toward the suction passage with respect to the orbiting center of the orbiting scroll. Item 5).

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 using a gas compressor as an example. 1 is a scroll compressor main body of the present invention, and a fixed scroll 3 is fixed to a casing 2 by bolts 4 or other fastening members. The fixed scroll 3 is composed of a head plate 5 serving as a frame thereof and a fixed scroll wrap 6 erected at right angles to the head plate to form the head plate in a spiral shape in plan view.
It is constituted by.

On the other hand, below the fixed scroll 3 in FIG.
The orbiting scroll 7 is also constituted by a mirror plate 8 and a spiral orbiting scroll wrap 9 which stands upright to the mirror plate 8 and meshes with the fixed scroll.
The fixed scroll wrap 6 and the orbiting scroll wrap 9
Are engaged with each other while maintaining a slight gap such that their peaks and grooves do not interfere with each other. The orbiting scroll 7 orbits to form the working chamber 10 to perform the compressing action of the working fluid S ( (Fig. 2).

The center of the orbiting scroll 9 is RS-RS in FIG.
The line intersection revolves around the center AA line intersection of the drive shaft 11, which is also the center FS-FS line intersection of the fixed scroll 6, with the eccentric dimension e as the radius, and the drive shaft 11 rotates clockwise in the figure. As a result, the orbiting scroll 7 does not seem to rotate by the cooperation of the rotation preventing mechanism 12 and performs the orbital movement in the clockwise direction in the figure. In addition,
Reference numeral 13 denotes a crankshaft formed on the drive shaft 11, which supports a rotation preventing mechanism 12 integral with the orbiting scroll 7 via a bearing 14, and a balance weight 15 protrudes from the base end thereof in the outer peripheral direction so as to rotate. The dynamic balance with the scroll 7 is maintained. Reference numerals 16 and 17 denote bearings for supporting the drive shaft.
Is a pin crank for supporting the anti-rotation mechanism 12.

A discharge port 19 is formed substantially at the center of the fixed scroll wrap 6 at the wrap winding start position, and the working fluid compressed in the working space 10 is discharged to the outside from the discharge port 13 for consumption. Side.

On the other hand, from the winding end 20 of the fixed scroll wrap 6 to the center of the fixed scroll, FS-F in FIG.
The working fluid is sucked into the outer edge of the scroll wrap (see FIG. 2) extending substantially half a circle to the suction end 21 formed at a substantially symmetrical position in the clockwise direction at about 180 to 220 degrees across the S-line intersection. The passage 22 is formed, and the fixed scroll wrap winding end 20 and the orbiting scroll wrap winding end 24 in the circumferential direction on the inner wall 23 side are formed.
And a suction boss 25 is disposed near the suction boss 25.
A suction port 26 is formed in the suction port 27, and a suction chamber 28 is provided on the suction opening 27 side on the suction outlet side, and communicates with the suction passage 22.

The relative positional relationship between the suction opening 27 or the suction chamber 28 and the fixed scroll wrap 6 and the orbiting scroll wrap 9 will be described in more detail.
Is located substantially near the outer surface 29 of the orbiting scroll wrap 9, which is the winding end 24 of the orbiting scroll wrap 9, that is, in a position opposite to the suction opening 27 facing the suction passage 22. At the same time as the winding end 24 of the orbiting scroll wrap 9
The end-of-winding end 20 of the fixed scroll wrap 6 is located near the end-of-winding end 24 on the extension line.

The fixed scroll winding end 2
The shape of 0 is formed in a semicircular arc having a radius substantially equal to half the distance between the inner wall 23 of the suction passage and the outer surface 30 of the fixed scroll wrap in a cross section parallel to the end plate 5 of the fixed scroll 3. . With this configuration, the scroll wrap and its groove can be processed by one end mill, and the working fluid that has flowed into the suction passage 22 from the suction port 26 is wound at the winding end of the semicircular fixed scroll wrap. 20 is the guide and orbiting scroll wrap 9
And flows in a laminar flow state into the first suction action space A (10) formed by.

A seal member made of a special alloy or a special synthetic resin material is provided in a dust seal groove 32 formed in a circular ring shape on a sliding surface 31 with the orbiting scroll 7 which is an outer peripheral direction of the fixed scroll end plate 5. To form a dust seal 33, which is pressed against the sliding surface 34 of the orbiting scroll wrap 9 to slide into the working space 10 or the suction passage 2
Airtightness between 2 and the outside is maintained. 4, the DD-line intersection point in the center diagram of the circular ring-shaped dust seal 33 is α, α ′ with respect to the RR line intersection point in the turning center diagram 4 of the orbiting scroll 7 as shown in FIG. It is located at an eccentric position in the upper left direction, so that the inner wall surface of the suction passage can be enlarged in the outer peripheral direction by the amount of the eccentricity, and the outer peripheral dimension of the fixed scroll in the opposite direction by 180 degrees can be reduced to the center side. Are also miniaturized.

Next, the operation of the above structure will be described.
When the drive shaft 11 of the scroll compressor body 1 rotates clockwise, the orbiting scroll 7 revolves around the center of rotation R with the eccentric dimension e as the radius, and rotates in cooperation with the rotation preventing mechanism 12. Instead, the robot performs a turning motion in the clockwise direction in the figure.

By this swirling motion, the working fluid S passes through the suction opening 27 and the suction chamber 28 through peripheral devices such as an air cleaner (not shown) mounted at the inlet of the suction port 26 and an unloader device for controlling the suction fluid. Hand suction passage 22
Flows into.

After flowing into the suction passage 22, it flows into the first suction working space A formed by the engagement of the fixed scroll wrap 6 and the orbiting scroll wrap 9 therefrom. At this time, when the center RS of the orbiting scroll 7 is located at the upper leftmost position in FIG. 2 due to the rotation of the drive shaft, the orbiting scroll wrap winding end 24 is located at the upper left of the chain line in FIG. (Indicated by I in FIG. 3), and at this time, the space volume of the first suction working space A is maximized.

The working fluid that has flowed into the suction passage 22 from the suction port 26 advances toward the winding end 20 of the fixed arc-shaped fixed scroll wrap in the vicinity of the suction opening 27, and the half formed at the winding end. The arcuate portion serves as a fluid guide and flows into the first suction action space A in a laminar flow state.

At the same time, the second end of the suction end 21 on the opposite side from the fixed scroll wrap end 20 by approximately 180 degrees.
Similarly, a part of the working fluid that has passed through the suction opening 27 flows through the suction passage 22 in a laminar flow in the clockwise direction in the same direction as the turning direction of the orbiting scroll because the space volume in the suction working space B is also maximized. Then, the air flows into the second suction operation space B, and at this time, both suction operation space volumes reach the maximum suction amount.

As the drive shaft further rotates clockwise, the winding end 24 of the orbiting scroll wrap 9 also turns in the lower right direction in FIG. 2 in synchronism therewith, and the center RS of the orbiting scroll is set in FIG. When the scroll scroll wrap 9 is located at the lowermost right side, the winding end 24 at the lower right of the alternate long and short dash line is at the position indicated by II in FIG. 3, and at this time, the first suction action space A and the second suction action The space B is shut off from the suction passage 22, and the suction closing is completed. Thereafter, the two working spaces advance toward the center of the spiral of the scroll wraps while gradually reducing the space volume with the rotation of the drive shaft, and are supplied from the discharge port 19 to the consumption side.

FIG. 3 shows a second embodiment of the present invention, in which a working fluid suction port is provided on a fixed scroll outer wall in a direction substantially perpendicular to the end plate.

Hereinafter, the same members as those of the above-described embodiment will be denoted by the same reference numerals, and the description of the same structure will be omitted.
In the second embodiment, a blow boss 40 is provided on the outer wall of the fixed scroll 3 in a direction substantially perpendicular to the end plate 5 (axial direction of the drive shaft 11), and an unloader device (not shown) is provided at a suction port thereof. And peripheral auxiliary equipment such as an air cleaner. A suction hole 42 having a substantially circular cross section is formed along the center axis 41 of the blow boss 40 along the center axis 41 of the boss, and one end of the suction hole is located outside the fixed scroll wrap 6. It is open along the side surface, and its suction opening 27 communicates directly with the suction passage 22. Then, the working fluid S flowing from the suction hole 42 into the suction opening 27 flows into the suction passage 22 and thereafter flows into the first and second suction working spaces A and B via the path described in the first embodiment. Will be done. In the second embodiment, the center axis 41 of the suction boss 40 and the blow hole 42 is arranged in a direction perpendicular to the outer surface of the scroll wrap in the first embodiment. Since 41 is provided on the outer wall of the fixed scroll 3 in a direction substantially perpendicular to the end plate 5, for example, when processing the suction opening of the blowing boss 40 or forming the suction hole 42, the flat portion of the end plate 5 is Since the setting may be performed on the processing table, the processing setup time and the processing time can be reduced. In this regard, in the case of the conventional structure, when processing the suction boss portion, it is necessary to set the end plate 5 at right angles and set it on the processing table. However, according to the present embodiment, the problem can be solved.

The present invention is not limited to the above-described embodiment, and various design changes and the like can be arbitrarily made according to the embodiment within the scope of the present invention.
For example, the shape of the suction hole and the suction opening is not limited to a circle, but may be a semicircle or a square.The circumferential range of the suction passage extends from the fixed scroll wrap winding end to the center of the fixed scroll. The range is not limited to a range extending substantially over a semicircle, and may be larger. In short, it may be provided only on one side of the fixed scroll wrap.

[0036]

As described above, according to the first aspect of the present invention, the suction port for the working fluid flowing into the suction passage is formed at one outer wall of the fixed scroll, and the suction port is connected to the suction working space from the suction port. It is possible to provide a high-efficiency scroll compressor in which the flow resistance (pressure loss) of the working fluid and the rise of the suction temperature in the process up to the inflow are suppressed as small as possible and the suction efficiency is not reduced. Also, the working fluid flowing into the suction chamber from the suction opening flows into the first working space with the shortest distance, and always keeps the turning direction of the orbiting scroll in the second working space. Since the laminar flow is performed in the same direction, the suction efficiency can be further improved. Further, the invention according to claim 3 sets the circumferential length of the suction passage adjacent to the working space to a minimum length as much as possible,
The leakage length of the fluid from the working space can be suppressed by making the sealing length between the suction passage and the working space adjacent thereto smaller than before.

According to the fourth aspect of the present invention, the size of the fixed scroll in the outer peripheral direction can be made as small as possible because the blow hole of the suction port is formed in a direction substantially perpendicular to the end plate of the fixed scroll. When processing the suction port, the end plate may be set downward on the processing table, so that the processing becomes much easier as compared with the case where the suction port is provided on the outer peripheral portion of the fixed scroll. Further, the auxiliary space such as an unloader device and an air cleaner can be easily mounted by effectively utilizing the outer wall space, and the overall size of the compressor in the circumferential direction can be reduced.

According to the fifth aspect of the present invention, since the center of the dust seal provided on the end plate of the fixed scroll is eccentric toward the suction passage with respect to the center of rotation of the orbiting scroll, the size of the suction passage in the outer circumferential direction can be adjusted. In addition to being able to expand as much as possible, the outer dimensions in the opposite direction by 180 degrees can be reduced accordingly, so that the diameter of the dust seal can be reduced and the diameter of the orbiting scroll can also be reduced, so that the balance weight can be reduced in weight and the overall compressor can be reduced in size. Can be

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a scroll compressor of the present invention.

FIG. 2 is a front view of the first embodiment in the XX section of FIG. 1 of the present invention.

FIG. 3 is a partial front view of the second embodiment in a section XX of FIG. 1 of the present invention.

FIG. 4 is an enlarged view of the central part of FIG. 2 of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll compressor body 3 Fixed scroll 5 End plate (fixed scroll) 6 Fixed scroll wrap 7 Orbiting scroll 8 End plate (orbiting scroll) 9 Orbiting scroll wrap 10 Working space 11 Drive shaft 12 Rotation prevention mechanism 13 Crankshaft 14, 16, 17 Bearing 15 Balance weight 18 Pink rank 19 Discharge port 20 Fixed scroll wrap winding end 21 Suction end 22 Suction passage 23 Inner wall (of suction passage 22) 24 Orbiting scroll wrap winding end 25 Suction boss 26 Suction port 27 Suction opening 28 Suction chamber 30 Fixed scroll wrap outer surface 31 Sliding surface 32 Dust seal groove 33 Dust seal 34 Sliding surface 40 Suction boss 41 Center shaft 42 Suction hole AA Center of drive shaft FS-FS Center of fixed scroll RS-RS Center of orbiting scroll DD dust sea Center R-R pivot E-E ejection opening center of the orbiting scroll of

Claims (5)

[Claims] An end plate fixed to a casing, a fixed scroll having a spiral fixed scroll wrap provided upright to the end plate, and a revolving scroll wrap meshing with the fixed scroll wrap to form an operation space. In a scroll compressor having an orbiting scroll having an eccentric orbiting motion without rotating with respect to the center of a drive shaft, a suction port for a working fluid communicating with a suction passage is provided at one place on an outer wall of the fixed scroll. A scroll compressor, wherein a suction opening of a mouth is arranged near a winding end of a revolving scroll wrap. 2. The scroll compressor according to claim 1, wherein the center of the suction opening of the blowing port is disposed at a position substantially perpendicular to the outer peripheral surface of the winding end of the orbiting scroll wrap. 3. The suction passage provided in the fixed scroll,
From the winding end of the fixed scroll wrap provided opposite to the circumferential end of the winding end of the orbiting scroll wrap,
3. The scroll compressor according to claim 1, wherein said scroll scroll is provided at an outer edge of a fixed scroll wrap extending substantially a half circle around the center of said fixed scroll. 4. The fixed scroll according to claim 1, wherein a blow hole of a blow port provided on an outer wall of said fixed scroll is formed in a direction substantially perpendicular to a head plate of said fixed scroll.
A scroll compressor according to any one of the preceding claims. 5. A head plate fixed to a casing, a fixed scroll having a spiral fixed scroll wrap provided upright on the head plate, and an orbiting scroll wrap meshing with the fixed scroll wrap to form an operation space. In the scroll compressor, the orbiting scroll has an eccentric orbiting motion without rotating with respect to the center of the drive shaft, and a circular ring-shaped dust seal is provided on a sliding surface of the fixed scroll head plate with the orbiting scroll. A scroll compressor wherein the center of the dust seal is eccentric to the suction passage side with respect to the center of rotation of the orbiting scroll.