JPH1162856A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll fluid machine provided with a structure in which a driving scroll and a driven scroll are made eccentric, respectively rotated and synchronously rotated, provided with a cavity on the central part of a driven scroll boss part so as to be separated from a scroll compression part, provided with a prime mover directly-connected mechanism housing a synchronous rotational mechanism having an Oldaham's coupling structure in the cavity, for supplying oil into the cavity, for completely sealing to the scroll compression part by a seal ring, and using no coupling, and to be cooled by a sirocco fan for blasting air to two circuits on the center part and the outer peripheral part. SOLUTION: A synchronous mechanism is provided in the central cavity of a driven scroll boss part 6c separated from a scroll compression main body so as to be made to the prime mover directly-connected type to be supplied and lubricated by oil, having the large abrasion resistance and the long life, and a structure to be cooled by a sirocco fan 18 for blasting air to two circuits. Accordingly, a balance weight and a pin crank are dispensed with, an Oldaham's coupling synchronous mechanism is supplied and lubricated by oil even if the scroll compression part is made oil free, and a structure having the long life and the large abrasion resistance is made, the number of part items can be decreased, and the cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine used for a blower or a vacuum pump.

[0002]

2. Description of the Related Art The principle of operation of a scroll fluid machine is well known in the prior art. In a pair of scrolls, one of the scrolls is fixed, the other engaged scroll is turned, and the compression chamber is moved and reduced. Both the orbiting type and the eccentric scroll are rotated around their respective axes, and the wrap compression chamber of the scroll is constituted by the amount of eccentricity between the two scrolls. There are two types of rotation type. The method related to the present invention is the latter rotation type, and six methods (described in Japanese Patent Application No. 8-354255) of the synchronous rotation method of the driven scroll with respect to the driving scroll are considered. The reason is that the driving scroll is rotated, and the driven scroll is brought into contact with the driving scroll side wall and the scroll, and is driven to rotate by the frictional force. Also, as the next method,
There is a method based on a contact configuration in consideration of synchronous rotation by an arm and an Oldham joint connected from the outer peripheral portions of both scrolls.

As described in Japanese Patent Application No. 8-354255, as a synchronous rotation method of an oil-free scroll fluid machine, a non-lubricating method of an eccentric double shaft using a double-rotating central Oldham type oil-free joint has been proposed. I have. In connection with driving of the driving scroll to the prime mover, it is common to mount a coupling between the driving scroll shaft and the prime mover shaft and perform centering via a common base.

[0004]

In the conventional scroll fluid machine, the two most commonly used methods for synchronously rotating the driven scroll with the rotation of the driving scroll are the two configurations described above. Since the mechanism is conditioned on the contact of the synchronization mechanism, it is obvious that the scroll teeth and the synchronization mechanism are worn out, and the operation cannot be performed unless lubricating oil is interposed in the entire structure. It goes without saying that the driving noise caused by the metallic contacts is loud and the noise is also a problem. Therefore, the configuration is difficult to achieve as an oil-free scroll fluid machine. Japanese Patent Application No. 8-354255 discloses an oil-free scroll fluid machine by using an Oldham coupling system at the drive and driven scroll shaft center which solves the above-mentioned problems, and comprising a torque disk and a shaft connecting member of a self-lubricating material. Has formed. However, even in this configuration,
Since the mounting part is a scroll fluid machine, especially a vacuum pump, which has a high compression ratio and a high temperature space, there is a problem that the self-lubricating material needs to have high temperature resistance and wear resistance during continuous operation. did. Therefore, the first and second solutions of the present invention are to incorporate a complete synchronous mechanism, which is resistant to high temperature and wear, which does not cause the above-mentioned adverse effects even in the oil-free type, into the scroll structure separately from the scroll compression body. To be an issue.

Further problems to be solved by the present invention are a simple structure, a method of connecting to a prime mover for the purpose of cost reduction while maintaining operation and assembly accuracy, and a method of synchronizing the outer periphery of a side cover boss portion with a synchronous rotation. A third and fourth problem to be solved is a configuration for separating the mechanism and performing cooling by blowing air.

[0006]

As means for solving the above-mentioned problems, a driving scroll and a driven scroll are used.
The drive extension shaft fitted to the center of the drive scroll head is not provided with the scroll teeth up to the center position, and a seal ring is provided at a sealing position between the driven scroll head and the inner surface of the driven scroll head. Along with sealing the lubricant sealed in the internal cavity, heat resistance,
A first aspect of the present invention is a configuration in which a torque disk is sandwiched and mounted between a disk connecting shaft and a drive extension shaft made of a material in consideration of wear resistance. A second aspect of the present invention is that the seal ring is not mounted on the inner surface of the center plate of the driven scroll, but is mounted on the side surface of the inner plate of the cavity of the driven scroll boss.
The invention of claim 3 is configured such that the motor shaft is directly fitted into the boss portion of the driving scroll and the casing and the motor are connected without a distance piece. Further, a configuration in which a sirocco fan for effectively separating and blowing the driven scroll boss portion and the side cover boss portion for cooling is provided.

[0007]

According to the first aspect of the present invention, there is a concern that the center space of both scroll tooth wrap portions may reach a high temperature mainly due to the compression ratio. In this configuration, the end plate is separated from the central space by
In the cavity of the driven scroll boss that has a lower temperature than the center space, mount a heat-resistant, wear-resistant metal-based disk connecting shaft and torque disk, and use an oil bath with a lubricant, such as lubricating oil, to completely lubricate the oil. Backlash between the eccentric driving scroll and driven scroll is maintained at zero, the two scrolls are rotated synchronously, and there is no wear, no high temperature, no fatigue fracture, and torsional rigidity. Since the disk connection shaft of the Oldham coupling structure, the drive extension shaft and the torque disk which are small and sufficiently absorb torsional vibration are arranged, and the seal ring provided on the inner surface of the center end plate of the driven scroll rotates synchronously with the inner surface, It is configured to be able to exhibit a highly reliable sealing effect together with oil lubrication because of sliding only by the amount of eccentricity. Claim 2 is an effective configuration when used in a high vacuum pump that has an extremely high compression ratio. A seal ring is mounted in the cavity, the compression heat of the scroll is not directly heated, and the oil bath It is structured to cool with oil. According to a third aspect of the present invention, only the motor shaft is fitted into the boss portion of the drive scroll, so that high-precision assembly is possible. Since the mounting portion of the motor can be directly connected to the casing, the drive shaft of the drive scroll can be omitted. However, the structure is short, the assembly structure is simple, and the rotation accuracy is improved. Claim 4 shows a configuration of a cooling sirocco fan that requires additional components to the above configuration,
Since the fan is separated from the driven scroll boss part cavity area and the bearing part to perform cooling and air blowing, efficient air blowing can be performed particularly on the cavity area surface close to the shaft part.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments will be described with reference to the necessary drawings in FIGS. FIG. 1 shows an embodiment of claim 1 according to the present invention, and FIG. 3 shows an enlarged view of a driven scroll boss portion of the embodiment. As the scroll fluid machine of double-scroll rotary, 2 is driven scroll 6 and the driven scroll holds the eccentricity m (see FIG. 4) 2a, and the scroll teeth lap portion of the 6a, the V ₁ and V ₂ A compression chamber is constituted, and by the synchronous rotation of both scrolls, 21
The fluid that has flowed in from the fluid suction port is compressed from the outer peripheral part to the central part while reducing the compression chamber, and the compressed fluid is discharged from the 20 fluid discharge ports through the 19 ventilation holes of the 6 driven scrolls. 3 is a prime mover shaft and the shaft hole of 2b driving the scroll boss fitted with snug fit, rotatably constituted by C ₁ axis in the cylindrical space of the first casing. 6c driven scroll boss portion 15 bearing, assembled at the 5a side cover boss through 16, 17 oil seal rotatably _{C 2} axis. Reference numeral 6d denotes a driven scroll boss cavity, in which a 9a torque disk is enclosed by a 4a disk connection shaft hub and an 8a drive extension shaft hub formed at the tip of the 4 disk connection shaft. The eccentricity m and C ₁ axis and C ₂ axis, and held in an eccentric, constitutes 2a, the scroll teeth lap portion of 6a. The eccentricity m is a numerical value determined by the scroll tooth pitch, the scroll tooth thickness, and the scroll vortex number. 7
The tip seal compensates for the gap between the scroll tooth tip and the counterpart scroll head plate. 21 is a fluid inlet, 20 is a fluid outlet, and 13 is the lubricant level in the cavity. 1
Reference numeral 2 denotes a rotary ring, which has a built-in 11 seal ring and is slidably sealed on the inner surface of the center end plate of the driven scroll 6b. 6 d by 11 seal rings and 6 driven scroll center end plate
The driven scroll boss cavity and the scroll compression main body are completely shut off and separated.

Next, a 4a disk connecting shaft hub, an 8a drive extending shaft hub, and a 2 drive scroll of a 9 torque disk,
The synchronous rotation effect related to the six driven scrolls will be described with reference to FIG. (A) Figure 2 shows a configuration the same sealing points even at a state where 2a driving scroll lap portion sealing the compression chamber V _1, scroll teeth 2a and 6a at S contact line which rotational position I do. The driven scroll teeth of 6a are 2
with the driving scroll teeth of a, rotating at 90 ° phase difference, illustrating the (B) state diagram of 6a driven scroll teeth lap portion at 180 ° position sealing the compression chamber V _2. As shown in (A), (B), (C), and (D), the rotation chamber has a function of sealing the four-degree compression chamber in one rotation. In order to perform these functions, the two-drive scroll and the six driven scroll need to rotate synchronously at the same angular velocity, and the configuration thereof will be described.

As shown in FIGS. 3 and 7, the fitting tolerance of the short protrusions of the double shaft hubs 4a and 8a and the short groove 9a of the torque disk 9 is about H6 / g6. To be configured. Further, since the 9-torque disc has the above-mentioned fitting portion formed at two locations on both sides in a form of crossing at a 90 ° position, the eccentricity m of the C ₁ and C ₂ axes can be completely adjusted while performing synchronous rotation. Has the ability to absorb. 4a,
The two-shaft hub 8a and the torque disk 9 have an Oldham coupling structure in which a lubricant (oil) is supplied to the fitting portion and connected thereto, so that the related portions are not worn or deformed. . Torsional stiffness (degrees / kg) that indicates how many twists occur in the radial direction with respect to torque
−cm) is made of a metal material that guarantees that it can be set to 0, so that backlash can be reduced to zero. Further, the dual-shaft hubs 4a and 8a and the 9-torque disk are set with a sufficient load margin. Since the components are rotated separately from the scroll compression main body, an oil-free type scroll fluid machine that rotates synchronously while always maintaining a small gap between the two-drive scroll and the six driven scroll is used. This is a particularly advantageous configuration. In addition, lubricant (oil) is always sealed in the 6d cavity, and since the sliding of the fitting portion of the 9 torque disk is a sliding of the eccentric amount m per rotation, almost heat is generated. Does not happen. However, since a certain degree of heat is transmitted from the driven scroll, the air is cooled by blowing air from outside with an 18 sirocco fan. The seal ring 11 is made of a heat-resistant self-lubricating elastic material or a heat-resistant self-lubricating material such as carbon to back up the 12 heat-resistant elastic materials, and is slidably sealed on the inner surface of the center end plate of the driven scroll 6b. The rotating ring rotates 10 times, and the rotating ring rotates synchronously with the 6 driven scroll. Therefore, the sliding of the seal ring 11 is slid by the amount of eccentricity m per rotation, and the lubricant (oil) is used. Almost no wear occurs due to the lubricating configuration.

FIG. 5 shows a configuration in which a 10-rotation ring is mounted in a 6d cavity. When it is not desirable to mount the 10-rotation ring in a 6 driven scroll, or when a high compression ratio vacuum pump is used, the center of the 6 driven scroll becomes extremely hot. Suitable when there is fear. The structure and operation are the same as in FIG.

FIG. 5 and FIG. 6 show an 18 sirocco fan which is effective in the present configuration.
The blade 8a is accelerated by the central blade and is blown in the axial direction from below the step 18c.
Cools the lubricating oil in the cavity effectively. The atmosphere sucked from the suction hole 18e is accelerated by the outer blades 18b to cool the bearing 15 and the like. In the case of the 18 sirocco fan shown in FIG. 3, the structure is such that the efficiency of blowing air to the center 4 disk connecting shaft is low.

Next, in the configuration in which the three prime mover shafts are fitted into the 2b driving scroll boss portion, the use of bearings is omitted.
The amount of radial deviation can be reduced by the rotational tolerance of the bearing, and high rotational accuracy can be ensured.

[0014]

The rotary scroll fluid machine according to the prior art has
Although there are many drive configurations, the oil supply type is the mainstream, and both have problems in synchronization stability, generate large noise, and there are many problems in making the scroll portion oil-free due to the configuration. There is also a method of using a self-lubricating Oldham coupling as a completely oil-free type.However, due to concerns about abrasion and the occurrence of backlash due to this, problems such as contact of scroll teeth can be considered. The realization of a synchronization mechanism was urgently needed. The present invention drives the eccentricity, equalizes the angular velocities of the driven scrolls, drives the hubs and torque disks of both shafts without deformation and wear, and configures the driven scroll bosses separated from the driven scrolls in the cavity of the driven scroll boss. By maintaining lubrication accuracy by lubrication and sealing lubricant such as oil by seal ring with little lubrication and wear by lubricant, and by performing compression action that does not contact scroll teeth by perfect synchronous rotation An unprecedented oil-free and compact scroll fluid machine can be achieved. Further, unlike the orbiting scroll fluid machine, a pin crank mechanism and a balance weight are not required. Even if this rotary scroll is planned to have a high compression ratio of a single scroll type, it is easy to correct the balance because it does not have a crankshaft configuration. Further, when there is a concern about a high temperature in the center of the scroll at a high compression ratio, a feature is provided in which a seal ring can be mounted in the cavity of the driven scroll boss to solve this concern. Further, by fitting the motor shaft directly into the driving scroll boss portion, the overall length can be shortened, the plan can be made with high accuracy, and the cost can be reduced. The cooling fan can be composed of two circuits by steps. Except for the drawback that the ventilation is concentrated in the outer peripheral direction due to the characteristics of the sirocco fan,
The fan at the center of the step can effectively blow the cavity side surface, so that the lubricant (oil) can be cooled efficiently.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a scroll fluid machine according to the present invention.

FIG. 2 is a scroll wrap transition diagram of the scroll fluid machine.

FIG. 3 is an enlarged view of a driven scroll boss part of FIG. 1;

FIG. 4 is a side view of the seal ring mounting unit of FIG. 1;

FIG. 5 is an enlarged view of a driven scroll boss part in which a seal ring is similarly mounted in a cavity.

FIG. 6 is a block diagram of a cooling sirocco fan with steps.

FIG. 7 is a perspective view of a hub and a torque disk of the scroll fluid machine.

[Explanation of symbols]

Reference Signs List 1 casing 2 drive scroll 2a drive scroll teeth 2b drive scroll boss 3 motor shaft 4 disk connecting shaft 4a disk connecting shaft hub 4c ... Disc connecting shaft guide 5... Side cover 5a... Side cover boss 6... Followed scroll 6a... Followed scroll teeth 6b.
Driven scroll boss portion 6d Driven scroll boss portion cavity 7 Chip seal 8 Drive extension shaft 8a Drive extension shaft hub 9 Torque disk 10 Rotating ring 11 … Seal ring 12… Heat-resistant elastic material 13 …… Lubricant level in cavity 14… Plug 15… Bearing 16, 17…
... oil seal 18 ......... cooling sirocco fan 18a ......... center blade 18b ......... outer vane 18c ......... Step 19 ......... vents 20 ......... fluid output 21 ......... fluid inlet C ₁ … Drive scroll axis C ₂ … Driven scroll axis m… Eccentric amount

Claims (4)

[Claims] 1. A casing comprising a casing, a side cover, a driving scroll, and a driven scroll, wherein the driving scroll rotates on a driving axis, and the driven scroll rotates on a driven axis eccentric to the driving axis. The scroll rotates synchronously, and the compression chamber is formed by a wrap portion provided with scroll teeth in parallel with the axis from the end plates of both the driving and driven scrolls, and the volume is compressed from the outer periphery toward the center. In the fluid machine, the driving and driven scrolls are formed by engaging and constructing the mutual scroll teeth with a certain angular difference, and the driven scroll is provided with a boss for fitting a bearing at the rotation axis. The center of the boss is hollow, and the drive scroll is eccentric in the hollow and has the function of rotating synchronously. A seal ring is in contact with the center portion of the driven scroll and the inner surface of the end plate, and a rotating ring fitted thereto is mounted via a drive extension shaft. A scroll fluid machine characterized in that a scroll is synchronously rotated by a single drive source and a lubricant is supplied into a cavity. 2. A scroll comprising a casing, a side cover, a driving scroll and a driven scroll, wherein the driving scroll rotates on a driving axis, and the driven scroll rotates on a driven axis which is eccentric to the driving axis. Rotates synchronously, and from the end plates of both driving and driven scrolls,
In a scroll fluid machine having a configuration in which a compression chamber is formed by a wrap portion provided with scroll teeth both parallel to the axis and the volume is compressed from the outer periphery toward the center, mutual scroll teeth formed by both the drive and driven scrolls are: The driven scroll is provided with a boss portion for fitting the bearing at the rotation axis, the center portion of the boss portion is hollow, and the driving scroll is provided in the hollow. Is eccentric,
With the function of rotating synchronously, it consists of connecting the torque disk with the disk connecting shaft and the drive extension shaft, and the driven scroll, in the center cavity of the bearing fitting boss part, on the side of the end plate,
With the seal ring in contact, the fitted rotating ring is mounted via the drive extension shaft, and with this configuration, the drive scroll and the driven scroll rotate synchronously with a single drive source and supply lubricant into the cavity. Scroll fluid machine characterized by the following configuration. 3. The driving scroll according to claim 1, wherein the driving motor shaft is fitted into the shaft fitting boss portion of the driving scroll, and the casing and the driving machine are directly connected. Scroll fluid machinery. 4. A sirocco fan which can be cooled by separating a bearing fitting boss portion of a driven scroll and a disk connecting shaft mounted in a center cavity outward to separate a driven scroll boss portion cavity area and a side cover boss portion. 3. The scroll fluid machine according to claim 1, wherein the scroll fluid machine is mounted.