JP3385234B2 - Scroll pump - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to reduction in temperature rise and cost reduction of a scroll pump.

[0002]

2. Description of the Related Art Conventional scroll pumps have a fixed spiral vane portion having spiral spiral blades formed on one side surface, and a movable spiral vane having spiral spiral protrusions opposed to the fixed spiral vane portion. By arranging the parts in mesh with each other and rotating the movable spiral blade around the fixed spiral blade, the work volume is continuously reduced by changing the volume of the working space formed by the fixed spiral blade and the movable spiral blade. The air in the space is compressed. As shown in FIGS. 9 and 10, a method of swirling the movable spiral blade around the fixed spiral blade is to support a main shaft 17 directly connected to the electric motor 2 at the center of the bottom surface of a cylindrical fixed frame body 4 having a bottom. Then, the auxiliary frame fixing plate 8 which rotatably supports the plurality of auxiliary shafts 21 (at least three or more) is fixed to the inside of the fixed frame body 4 and the hole through which the main shaft 17 is inserted. The movable spiral wing portion 6 is fixed to the opening side of the fixed spiral wing portion 5 with the movable spiral wing portion 6 engaged with the movable spiral wing portion 6. A cylindrical main bearing seat 32 is provided in the center of the movable spiral wing portion 6 on the side opposite to the movable spiral blade, and a plurality of sub bearing seats are arranged radially around the main bearing seat 32 so as to face the sub shaft 8 of the sub shaft fixing plate 8. 31 is formed.
A crank main shaft 18 is eccentrically formed at the tip of the main shaft 17, the crank main shaft 18 is inserted into the main bearing seat 32, and the plurality of sub shafts 21 are inserted into the plurality of sub bearing seats 31 to hold the movable spiral wing portion 6. To do. The diameter of the sub shaft 21 and the sub bearing seat 31 and the amount of eccentricity thereof are set according to the amount of eccentricity between the main shaft 17 and the crank main shaft 18.

When the main shaft 17 is rotated in this state, the crank main shaft 18 turns about the axis of the main shaft 17 and continuously compresses the volume of the working space formed between the movable spiral blade and the fixed spiral blade. Although the tips of the plurality of sub shafts 21 are inserted into the plurality of sub bearing seats 31 to prevent the movable spiral wing portion 6 from rotating and only to rotate, the sub shafts 21 that swivel in the sub bearing seats 31 do not. Such a load causes the temperature of each part of the scroll pump to rise due to friction and causes noise and vibration. Further, in order to make the swirling of the movable spiral wing section 6 smooth,
Related crank main shaft 18, main bearing seat 32, counter shaft 21,
High processing precision is required for the dimensions and the position of the auxiliary bearing seat 31, and the deterioration of the yield and the increase of the processing cost cannot be avoided.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll pump which has improved vibration / noise characteristics, reduced temperature rise, improved yield, and reduced processing cost.

[0005]

According to the present invention, a compression mechanism includes a fixed spiral wing portion forming a fixed spiral blade, and a movable spiral blade forming a plurality of working spaces that mesh with the fixed spiral blade to form a movable spiral blade. And a swivel support portion that supports the movable spiral wing portion, suppresses its rotation, and only swivels,
The fixed spiral wing is mounted on the fixed frame, and the auxiliary shaft fixing plate is attached in parallel with the movable spiral wing sandwiched between them.The swivel support has a plurality of auxiliary shafts radially arranged at equal intervals around the main shaft. The crank spindle is eccentrically parallel to the tip of the main shaft, and the crank spindle is eccentrically parallel to the tips of the auxiliary shafts to form a crank spindle.The crank main bearing is located in the center of the side of the movable spiral blade opposite to the movable spiral blade. , A plurality of crank sub-bearings are provided on the outer side facing the plurality of crank sub-axes, and the main shaft is rotatably supported at a predetermined position on the center of the sub-shaft fixing plate at the center. Crank main shaft and a plurality of crank counter shafts rotatably hold the movable spiral wing part, and crank main shaft and a plurality of crank counter shafts rotatably hold the movable spiral wing part. The internal pressure generated in the Was air-cooled compression mechanism is discharged to the fixed frame body through.

According to the present invention, two sub bearings are radially arranged on the sub shaft fixing plate at equal intervals from the main bearing, the main shaft is rotatably inserted through the main bearing, and the sub shaft is passed through the sub bearing. Each of them is rotatably held, and the crank main shaft is inserted in the center of the side surface of the movable spiral blade portion opposite to the movable spiral blade facing the auxiliary shaft fixing plate, and the two crank auxiliary shafts are inserted at predetermined positions on the outer periphery thereof. Then, the main shaft was rotated by an electric motor and the movable spiral blade was swung between the fixed spiral blades. According to the third aspect of the present invention, the ring-shaped elastic material is sandwiched between the outer circumferences of the plurality of sub-bearings for holding the sub-shaft, and the sub-shaft fixing plate is attached. According to a fourth aspect of the present invention, a blind hole for inserting the drive shaft of the electric motor is formed in the center of the other end of the main shaft, the drive shaft is inserted, and the outer periphery of the blind hole intersects the shaft center and is integrally formed with a pin hole. Was drilled and a dowel pin was passed through the pin hole to detachably connect the main shaft.

[0007]

The details of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a schematic view of a main part showing a configuration of a scroll pump according to an embodiment of the present invention. The scroll pump 1 is composed of an electric motor 2 and a compression mechanism 3 driven by the electric motor 2. The compression mechanism 3 includes a fixed frame body 4, a fixed spiral blade portion 5, a movable spiral blade portion 6, and a swivel support portion 7 that supports the movable spiral blade portion 6. The fixed frame body 4 is composed of a cylindrical casing placed horizontally, and a sub-shaft fixing plate 8 is formed in the center of the casing to partition the sub-shaft fixing plate 8 into left and right parts. While holding the sub-bearings 10 on one side (on the left side in the figure) of the main bearing 9, radial recesses are provided at two locations at equal intervals. The sub bearing 10 is held by the sub shaft fixing plate 8 with a ring-shaped elastic material 11 sandwiched between the sub bearings 10.

The fixed spiral blade 5 is formed by spirally cutting a groove from the center of one surface of the disk-shaped cylindrical body toward the outer periphery to form a fixed spiral blade 5a between the grooves. Further, a discharge port 12 is formed at the center of the fixed spiral blade 5a, and a suction port 13 is formed at the outermost tip of the groove formed between the fixed spiral blade 5a and the outer circumference. Further, an extraction port 14 is formed at a position symmetrical to the suction port 13 by penetrating the outer circumference of the fixed spiral wing portion 5. The movable spiral wing portion 6 has a disc shape,
On one side (left side in the figure), a movable spiral blade 6a is erected from the center in a spiral shape, and its height is adjusted to a height corresponding to the depth of the groove of the fixed spiral blade 5a. In this state, when the fixed spiral blade 5a and the movable spiral blade 6a are engaged with each other, the tip of the fixed spiral blade 5a and the groove bottom surface of the movable spiral blade 6a, and the groove bottom surface of the fixed spiral blade 5a and the movable spiral blade 6a are brought into close contact with each other. Then, a plurality of closed working spaces 29 are formed between the fixed spiral wing 5a and the movable spiral wing 6a. A step recess is provided in the center of the back surface of the movable spiral wing portion 6 to rotatably hold the crank main bearing 15, and further, a step recess is formed at a predetermined radial distance outside the crank main bearing 15 at a radial position. Two crank bearings 16 are rotatably held in each of them. A crank main shaft 18 is formed in parallel with the main shaft 17 at a tip end thereof with a certain distance from the shaft center, and a blind hole 20 is formed at the center of the other end so as to match the drive shaft 19 of the electric motor 2. Similarly, a crank auxiliary shaft 22 is formed on the auxiliary shaft 21 in parallel with the tip end thereof with a constant gap from the axis.

The main shaft 17 is fitted into the main bearing 9 of the auxiliary shaft fixing plate 8, and the crank main shaft 18 side is projected to one side (left side in the figure) of the fixed frame body 4. Further, the auxiliary shaft 21 is fitted into each of the two auxiliary bearings 10 of the auxiliary shaft fixing plate 8, and the crank auxiliary shaft 22 side is placed on one side (left side in the figure) of the crank frame 18.
Project in parallel with. In this state, the movable spiral wing portion 6 is inserted into one side (left side in the drawing) of the fixed frame body 4, and the crank main shaft 18 of the main shaft 17 is attached to the movable spiral wing portion 6. The crank sub-shaft 22 of the shaft 21 is fitted into each of the crank sub-bearings 16 and the movable spiral wing portion 6
Support. Then, the fixed spiral blade 5a is turned inward and meshed with the movable spiral blade 6a of the movable spiral blade portion 6, and the outer periphery of the fixed spiral blade portion 5 is fastened and fixed to the fixed frame body 4.

Further, the other side of the fixed frame body 4 (right side in the figure)
The balance weight 23 is attached to a predetermined position on the outer periphery of the main shaft 17 protruding in the direction. Then, the drive shaft 19 of the electric motor 2 is fitted into the blind hole 20 of the main shaft 17, the pin hole 25 is processed through the main shaft 17 and the drive shaft 19, and the knock pin 2 is inserted into the pin hole 25.
6 is inserted and the main shaft 17 and the drive shaft 19 are connected. The electric motor 2 is fixed to the electric motor mounting plate 24, and the electric motor mounting plate 24 is fixed to the other side (right side) of the fixed frame body 4. Further, a blower pipe 27 is connected to the extraction port 14 of the fixed spiral wing portion 5, and the blower pipe 27 is connected.
The other end is drawn out to the upper part of the fixed frame body 4 and connected to the space 28 surrounded by the movable spiral wing portion 6, the fixed frame body 4 and the counter shaft fixing plate 8. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, showing a state in which the movable spiral wing portion 6 is swung by the rotation of the main shaft 17.

FIG. 3 and FIG. 4 are sectional views showing the meshing state of the fixed spiral blade and the movable spiral blade. FIG. 3 shows a state in which the movable spiral blade 6a is at the uppermost position, and FIG. 4 shows a state in which the movable spiral blade 6a is at the lowermost position. 5, FIG. 6, FIG. 7, and FIG.
Shows the process of air compression over one rotation, and shows the relative positions of the fixed spiral wing 5a and the movable spiral wing 6a, respectively. 3 and 4, when the movable spiral wing 6a swirls along the fixed spiral wing 5a, a working space 29 is sequentially formed between the fixed spiral wing 5a and the movable spiral wing 6a, and the main shaft 17
The working space 29b and the working space 29c are located substantially symmetrically with respect to
To form. The air in the outer working space 29a is compressed by the swirling of the movable spiral vanes 6a and is discharged from the extraction port 14. There is no symmetrical working space in the working space 29a, and since the internal air is compressed by the swirl of the movable spiral vane 6a to serve as load resistance as it is, the fixed spiral vane 5a is provided with the extraction port 14 and the working space 29a Air is discharged from the extraction port 14 so that it can be easily started. Working space 29
The volumes of b and the working space 29c are substantially equal to each other, and the working space 29b and the working space 29c generated by the turning of the movable spiral wing 6a.
There is little difference in the internal pressure, and no radial resistance occurs at startup. Due to the swirling of the movable spiral blade 6a, the working space 29b and the working space 29c have their inner volumes narrowed in the order of FIGS. 5, 6, 7, and 8 to compress the internal air and discharge the air from the discharge port 12. The operation is repeated continuously. Furthermore, work space 2
The air 9a is discharged from the bleed port 14 and is sent to the blower port 30 provided at the upper part of the fixed frame body 4 through the blower pipe 27, and the space 28 surrounded by the fixed frame body 4, the movable spiral blade 6a and the auxiliary shaft fixing plate 8 is provided. It is then discharged into the interior of the machine through the fixed frame body 4.

The operation of the present invention will be described with the above configuration. When the main shaft 17 is rotated in the direction of the arrow in FIG. 3 by the electric motor 2, the crank main shaft 18 turns around the main shaft 17 axis, and the movable spiral wing portion 6 is rotated around the main shaft 17 axis via the crank main bearing 15. Turn to. The movable spiral wing portion 6 is prevented from rotating by the two auxiliary shafts 21, and revolves around the main shaft 17. The meshing of the movable spiral wing 6a and the fixed spiral wing 5a changes in the order shown in FIGS. 3, 4, 5, and 6, and the working space 29 formed by the movable spiral wing 6a and the fixed spiral wing 5a rotates sequentially. Then, the air in the work space 29 is compressed, moved to the center of the fixed spiral wing portion 5, and discharged from the discharge port 12.
The scroll pump 1 cannot set the air pressure higher than the air compression pump by the reciprocating movement of the piston, but the main shaft 17 is directly rotated by the electric motor 2 to efficiently compress the air. You can Further, it is possible to continuously compress the air and continuously supply the compressed air.

In order to prevent the rotation of the movable spiral wing portion 6, it is possible to prevent the rotation by providing only one auxiliary shaft 18 around the main shaft 17. However, depending on the relative positions of the movable spiral wing portion 6 and the fixed spiral portion 5 at the time of stop, the frictional resistance of each portion increases at the time of restart, and the load applied to the auxiliary bearing 10 may become excessive and it may be difficult to start. A motor with a small starting torque may reverse. Therefore, normally, the auxiliary shafts 21 are radially arranged at three places around the main shaft 17, and the load applied to the auxiliary shaft 21 is evenly shared to reduce the load, thereby facilitating the activation. In the present invention, since the light load scroll pump 1 is targeted, two auxiliary shafts 21 are radially arranged around the main shaft 17 at equal intervals to balance the loads applied to the respective auxiliary bearings 10, and further The ring-shaped elastic material 11 is sandwiched on the outer periphery of the bearing 10 to absorb the radial force applied to the sub bearing. Further, the mounting positions of the main bearing 9 and the sub bearing 10 of the movable spiral wing portion 6, the relative positions of the main shaft and the sub shaft, the relative positions of the crank main shaft and the crank sub shaft,
Ring-shaped elastic material 1
It can be absorbed by 1 and can be kept in a state where it does not hinder starting. As a result, in addition to reducing the number of parts, positioning of the crank sub-bearing 16 and precise machining of the sub-shaft 21 can be reduced by at least one place, and the cost is reduced by reducing machining and improving workability. be able to

Further, the air in the work space 29a is bleeding port 1
4 and discharged into the space 28 surrounded by the fixed frame body 4 and the movable spiral wing portion 6 by the blower pipe 27, and the temperature rises due to the friction between the movable spiral blade 6a and the fixed spiral blade 5a or the auxiliary shaft fixing plate 8. Therefore, the inside of the compression mechanism 3 can be cooled.

[0015]

As described above, the air in the outermost working space of the working space formed by the fixed spiral vanes and the movable spiral vanes is compressed by the swirling of the movable spiral vanes to blow the air from the bleed port. By discharging to the space surrounded by the fixed frame body and the movable spiral wing portion via air, the temperature rise of the compression mechanism due to friction or the like can be air-cooled and suppressed to a low level, and the efficiency of the scroll pump can be improved. Further, the movable spiral blade is held on the auxiliary shaft fixing plate by the main shaft and the two auxiliary shafts to minimize the number of auxiliary shafts, thereby reducing the number of parts and machining work. By fitting a ring-shaped rubber elastic body on the outer periphery to absorb machining errors, the yield of precision machining can be improved and the cost of the scroll pump can be reduced. Further, by fitting the ring-shaped rubber elastic body, it was possible to provide a scroll pump that absorbs vibrations and impacts of the sub shaft and has less noise and vibrations.
In addition, maintenance of the scroll pump could be simplified by connecting the electric motor detachably.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a configuration of a scroll pump according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a meshing state 1 of the fixed spiral wing and the movable spiral wing of the present invention.

FIG. 4 is a cross-sectional view showing a meshing state 2 of the fixed spiral vortex blade and the movable spiral wing according to the present invention.

FIG. 5 is an explanatory diagram (1) showing relative positions of a fixed spiral wing and a movable spiral wing.

FIG. 6 is an explanatory view (2) showing relative positions of the fixed spiral wing and the movable spiral wing.

FIG. 7 is an explanatory diagram (3) showing the relative positions of the fixed spiral blade and the movable spiral blade.

FIG. 8 is an explanatory diagram (4) showing relative positions of a fixed spiral wing and a movable spiral wing.

FIG. 9 is a cross-sectional view of essential parts showing the configuration of a conventional scroll pump.

FIG. 10 is a BB cross-sectional view of a conventional scroll pump.

[Explanation of symbols]

1 scroll pump 2 electric motor 3 compression mechanism 4 fixed frame 5 Fixed spiral wing 5a Fixed spiral wing 6 Movable spiral wing 6a Movable spiral wing 7 Swivel support 8 Counter shaft fixing plate 9 Main bearing 10 Secondary bearing 11 Ring-shaped elastic material 12 outlets 13 Suction port 14 Bleed mouth 15 crank main bearing 16 Crank auxiliary bearing 17 spindle 18 crank spindle 19 Drive shaft 20 blind holes 21 Secondary axis 22 Crank countershaft 23 Balance Weight 24 Electric motor mounting plate 25 pin hole 26 knock pin 27 air duct 28 space 29 workspace 30 Blower 31 Secondary bearing seat 32 Main bearing seat

─────────────────────────────────────────────────── --- Continuation of the front page (72) Inventor Shinpei Ohno 94 Kajiya, Okayama City (56) References JP-A-5-133372 (JP, A) JP-A-1-273893 (JP, A) JP-A-60- 209690 (JP, A) JP 11-82328 (JP, A) JP 7-83179 (JP, A) JP 9-72285 (JP, A) JP 2-81981 (JP, A) Actual development Sho 63-69793 (JP, U) Actual development Sho 62-66285 (JP, U) Actual development Sho 58-146895 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/02 311

Claims (4)

(57) [Claims] Claim: What is claimed is: 1. A compression mechanism comprising: a fixed spiral wing portion having a fixed spiral wing; a movable spiral wing portion having a movable spiral wing that meshes with the fixed spiral wing to form a plurality of working spaces; and a movable spiral wing portion. The fixed swirl vane is mounted on a fixed frame body, and the auxiliary shaft fixing plate is mounted in parallel with the movable swirl vane being sandwiched between the swivel support part that supports the swirl support part that rotates while restraining its rotation. A plurality of auxiliary shafts are arranged radially at equal intervals around the main shaft, and the crank main shaft is eccentric to and parallel to the tip of the main shaft and the crank auxiliary shaft is eccentrically and parallel to the ends of the plurality of sub shafts. A crank main bearing is provided at the center of the side surface of the movable spiral wing opposite to the movable spiral wing, and a plurality of crank auxiliary bearings are provided outside the crank main bearing to face the plurality of crank auxiliary shafts. Main spindle in the center, multiple outer spindles at predetermined positions Is rotatably supported, and the movable main spiral wing is pivotally held by the crank main shaft and a plurality of crank auxiliary shafts, and the internal pressure generated in the work space on the outer circumference by the rotation of the movable spiral wing is extracted from the extraction port. It is a scroll pump that is exhausted from the inside through a blower pipe into a fixed frame, and the compression mechanism is air-cooled. 2. Two auxiliary bearings are radially arranged at equal intervals from the main bearing on the auxiliary shaft fixing plate, the main shaft is rotatably inserted through the main bearing, and the auxiliary shafts are respectively inserted through the auxiliary bearing. It is rotatably held, and a crank spindle is inserted in the center of the movable spiral wing portion opposite to the movable spiral wing, facing the auxiliary shaft fixing plate, and two crank auxiliary shafts are inserted at predetermined positions on the outer circumference thereof. The scroll pump according to claim 1, wherein the scroll pump is held by holding it in place and the main shaft is rotated by an electric motor to swivel the movable spiral blade between the fixed spiral blades. 3. The scroll pump according to claim 2, wherein a ring-shaped elastic material is sandwiched between outer circumferences of a plurality of sub-bearings for holding the sub-shaft, and the sub-shaft is fixed to the sub-shaft fixing plate. 4. A blind hole for inserting a drive shaft of an electric motor is formed at the center of the other end of the main shaft, the drive shaft is inserted, and the outer periphery of the blind hole is integrally formed with the pin so as to intersect with the shaft center. The scroll pump according to claim 2, wherein a hole is bored, and a main shaft is detachably connected to the pin hole by inserting a knock pin into the pin hole.