JP2002276568A - Scroll type pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin scroll type pump with a large flow rate. SOLUTION: The scroll type pump 1 comprises movable scroll parts 10, fixed scroll parts 20, and stator parts 30. In the movable scroll part 10, scroll blades 12 project from both sides of a disk 11, and a magnetic part 14 made of a magnetic material is formed on the outer periphery of the disk 11. In the fixed scroll part 20, scroll blades 22 to be engaged with the scroll blades 12 of the movable scroll part 10 project from the inner surfaces of two fixed boards 21 respectively which are mounted with the movable scroll parts 10 in-between. The stator part 30 consists of a fixed iron core 31 disposed on a circle circumscribed with the trajectory of revolution of the movable scroll part 10 and plural coils 32 wound around the fixed iron core 31. In the scroll type pump 1, the scroll blades 12 with different compression ratios are attached to both sides of the disk 11 in the line symmetry or plane symmetry relative to the disk 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a scroll type pump. More specifically, the present invention relates to a scroll-type pump driven by orbital motion on a circular orbit of a certain radius where the operation of a compression element is performed.

[0002]

2. Description of the Related Art Scroll-type pumps have attracted much attention in recent years because of their advantages such as the fact that no suction and discharge valves are required due to the principle of compression, the number of parts is small, and the efficiency is high.

As such a scroll type pump, for example, Japanese Patent Application Laid-Open No. 57-171002 and Japanese Patent Application Laid-Open No. 8-205552
There is one disclosed in Japanese Patent Application Laid-Open No. 5-205.

[0004] Japanese Unexamined Patent Publication No. 57-171002 discloses a movable scroll section having scroll blades protruding from both sides of a single moving side plate.
Two fixed scroll portions formed by projecting scroll blades combined with the scroll blades of the movable scroll portion on the inner surfaces of two fixed side plates provided with the movable scroll portion interposed therebetween. Have. In these two fixed scroll portions, a scroll unit is formed by interposing a detent piece at a plurality of fixed portions near the outer periphery and internally incorporating the movable scroll portion.

In the scroll type pump, the movable scroll portion is caused to perform a translation circular motion with respect to the fixed scroll by a driving mechanism disposed below the fixed scroll portion.

However, the pump requires an actuator and a mechanism for transmitting power below the fixed scroll portion. Therefore, it is very difficult to reduce the thickness of the scroll pump having such a structure.

On the other hand, in the apparatus disclosed in Japanese Patent Application Laid-Open No. Hei 8-205515, a movable scroll having spiral blades and a fixed scroll are combined with each other at a spiral portion, and a housing for holding the movable scroll is a stator. A magnetic circuit is formed so that the movable scroll becomes a rotor, and the movable scroll is driven directly.

Therefore, in the scroll type pump, the orbiting scroll is directly driven, and the pump and the actuator are compactly integrated, so that the size, weight and thickness can be reduced.

[0009]

However, although the latter scroll type pump can be made thinner,
The iron core and the coil forming the magnetic circuit have a structure supported by the housing below the orbiting scroll, and the spiral blades are configured on the upper surface of the orbiting scroll. For this reason, in order to increase the pump flow rate, the movable scroll must be widened in the direction of the revolution plane, and there is a problem that the pump becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and has as its object to provide a scroll pump having a small thickness and a large flow rate.

[0011]

A scroll type pump according to the present invention comprises a movable scroll portion having scroll blades protrudingly provided on both sides of a disk, and having a magnetic portion made of a magnetic material on an outer periphery of the disk. A fixed scroll portion in which scroll blades combined with scroll blades of the movable scroll portion are protruded from respective inner surfaces of two fixed plates provided with the movable scroll portion interposed therebetween; It is characterized by comprising a fixed iron core arranged along a circle and a stator portion composed of a plurality of coils wound around the fixed iron core.

In this scroll type pump, a movable scroll portion provided with scroll blades which are line-symmetric with respect to the disk is provided on both sides of the disk, and scroll blades which are plane-symmetric with respect to the disk are provided on both sides of the disk. A movable scroll section can be used.

An air discharge port and an air suction port are opened in one of the fixed scroll portions, and a disk of the movable scroll portion is provided immediately below the air discharge port and near the air suction port. A vent may be provided through it.

Further, in the scroll type pump of the present invention, a movable scroll portion having scroll blades having different compression ratios provided on both sides of the disk may be used.

Further, two scroll bodies provided with a scroll blade protruding from one surface of a disk and having a magnetic portion made of a magnetic material on the outer peripheral portion of the disk, have the same magnetic poles of the magnetic portion. It is also possible to use a movable scroll portion arranged so as to be aligned.

In these scroll type pumps,
It is preferable that a mechanism for restraining a revolving orbit is provided on the outer peripheral side of the movable scroll portion. The mechanism includes, for example, an eccentric shaft provided on at least one side of the disk, a concave portion provided inside the fixed plate, and a cam portion rotatably fitted in the concave portion. One provided with an eccentric hole into which the eccentric shaft is inserted can be used.
Also, it is desirable to provide the mechanism at two or more locations.

Further, in the scroll type pump of the present invention, it is preferable to provide a mechanism for restraining the movable scroll portion in the axial direction.

Further, it is desirable to provide a tension spring between the two fixing plates.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a view showing a scroll type pump 1 according to an embodiment of the present invention. FIG. 1 (a) is a sectional view thereof, and FIG. 1 (b) is a plan view thereof. The scroll-type pump 1 has scroll blades 1 on both sides of a disk 11.
The movable scroll parts 10, 10 provided with the projection 2
And scroll blades 22 combined with the scroll blades 12 of the movable scroll portion 10 on the inner surfaces of two fixed plates 21 provided with the movable scroll portion 10 interposed therebetween.
, A fixed iron core 31 arranged along the circumcircle of the orbit of the orbiting scroll member 10, and a plurality of coils 32 around which the fixed iron core 31 is wound.
And a stator portion 30 made of

The disk 11 serves as a substrate of the movable scroll section 10. On both surfaces of the disk 11, spiral scroll blades 12, 12 are provided. The scroll blades 12 may be directly attached to the disk 11, but in the illustrated example, they are formed integrally with the disk-shaped substrate 13,
It is attached to the disk 11 via the substrate 13.

A magnetic portion 14 made of a magnetic material such as a permanent magnet is provided on an outer peripheral portion of the disk 11 outside the substrate 13 so as to be driven by being attracted by a magnetic field generated in the stator portion 30. I have. Movable scroll part 10 shown
The disk 11 is formed entirely of permanent magnets and is magnetized in the direction of the revolving axis. One surface of the disk 11 is, for example, an S-pole, and the other surface is entirely N-pole. The scroll blades 12 are formed symmetrically with respect to the disk 11 as shown in FIG.

The scroll blades 12 combined with the scroll blades 12 of the movable scroll unit 10 are provided inside the two fixed plates 21.
A scroll groove 23 in which 0 can revolve is formed.
Further, an air discharge port 24 for discharging compressed air is provided substantially at the center of the fixed plate 21, and an air intake port 25 for taking in intake air is provided near the outermost part of the scroll groove 23. The outer peripheral portion of the fixed plate 21 has a thin plate shape, and has a structure in which the iron core 31 constituting the stator portion 30 can be sandwiched between the two fixed plates 21.

A plurality of, for example, six, stator portions 30 are arranged along the circumcircle of the orbit of the orbiting scroll portion 10 in the illustrated example. The stator portion 30 includes a fixed iron core 31 having a substantially C shape and a coil 32 wound around the fixed iron core 31. A current flows through the coil 32 to apply a magnetic field to the notch 33 of the fixed iron core 31. Cause. At least a part of the circumferential area of the magnetic part 14 of the orbiting scroll part 10 is located in the notch 33. The fixed plate 21 is supported by the fixed iron core 31.

Further, the movable scroll portion 10 is restrained from vibrating in the direction of the revolving axis by a restraining mechanism in the direction of the revolving axis. This restraining mechanism is composed of two bearing balls 26 provided so as to sandwich the disk 11 outside the orbiting scroll blades 12 and a spring 27 for urging one of the bearing balls 26 in the axial direction. ing. As a result, the movable scroll portion 10 is
Is urged in one of the directions, the vibration in the axial direction is suppressed, and the movable scroll portion 10 can be prevented from overturning. or,
Due to the use of the bearing balls 26, the orbiting of the movable scroll portion 10 can be smoothly performed.

In the scroll type pump 1, when a coil current is sequentially applied around the circumference to the stator portion 30 arranged along the circumcircle of the orbit, the movable scroll portion 10 is attracted to the stator portion 30 to which the current is applied. Been moved.
As a result, the movable scroll unit 10 attempts to draw a larger orbit due to the magnetic force generated in the stator unit 30 and the centrifugal force due to the movement of the scroll unit 10 itself. However, since the scroll blades 22 of the fixed scroll part 20 and the scroll blades 12 of the movable scroll part 10 are in contact with each other, the orbit is constrained by the scroll shape, whereby the movable scroll part 10 is driven with a substantially constant orbital radius.

On the other hand, a force that rotates in the direction opposite to the revolving direction acts on the orbiting scroll portion 10 due to frictional force at the time of driving and resistance force at the time of air compression. However, the fixed scroll blade 2
2 and the movable scroll blade 12 mesh with each other, and the rotation is restricted. If the magnetic force is larger than the meshing force, the orbiting scroll is driven to revolve while being restrained from rotating, so that the air can be compressed.
As described above, while the trajectory and the rotation are restrained, for example, FIG.
As shown in (a), (1) → (2) → (3) → (4), the orbiting scroll portion 10 can be revolved and the air can be compressed. The scroll blades 12 on the lower surface of the disk also revolve as shown in FIG.

Since the movable scroll portion 10 is provided with the scroll blades 12 on both sides of the disk 11, pump chambers are formed on both sides of the movable scroll portion 10, respectively. The scroll blades 12 and 22 are provided symmetrically with respect to the disk 11. Therefore, FIGS. 3 (a) and 3 (b)
As shown in (2), in each pump chamber, the two scroll blades 12, 22 revolve without phase difference. As a result, the supply and exhaust operations in both pump chambers coincide, and the flow rate of the conventional scroll pump 1 can be almost doubled. In addition, since the actuator for driving the movable scroll unit 10 is located on the outer periphery of the movable scroll unit 10, the thickness can be reduced.

Next, in the movable scroll portion 10 shown in FIG. 4, the scroll blade 12 has a shape obtained by rotating any one of the two scroll blades 12 shown in FIG. , Are made to be mirror-symmetric with respect to the disk 11. In addition, the scroll blades 22 of the fixed scroll section 20
Rotate to make.

As a result, as shown in FIGS. 5A and 5B,
Due to the revolution of the movable scroll section 10, one of the scroll blades 12 becomes (1) → (2) → (3) → as shown in FIG.
(4), the revolving operation is performed, and the intake → compression → exhaust operation is performed.
As shown in (b), the operation of (1) → (2) → (3) → (4) is performed in the order of exhaust → compression → intake. Thus, in the pump 1, the two scroll blades 12 revolve with a phase difference of about 180 °. Thus, the fluctuation of the resistance due to the air compression at each revolution angle during the revolving drive is averaged, so that the torque fluctuation of the pump 1 is reduced, and the vibration and noise can be reduced.

FIG. 6 is a view showing a movable scroll according to still another embodiment. In this movable scroll section 10, the revolving radius at the time of driving is the same, but one of the scroll blades 12 remains. The shape is similar to the blade 12. As a result, the compression ratios of the two pump chambers formed above and below the movable scroll portion 10 are different, and compressed air having different compression ratios can be obtained simultaneously by one pump. At this time, the spiral direction of the two scroll blades 12 may be line-symmetric with respect to the disk 11 or may be manufactured so as to be mirror-symmetric with respect to the disk 11.

FIG. 7 is an explanatory view of a scroll pump 1 according to still another embodiment of the present invention. Also in the scroll type pump 1, as shown in FIG.
Scroll blades 12 are provided on both upper and lower sides of the movable scroll portion 10, and pump chambers are formed on the upper and lower sides of the movable scroll portion 10, respectively. The movable scroll portion 10 is configured such that a scroll body 10 a having a scroll blade 12 provided on one side of a disk 11 overlaps the disks 11. At this time, as shown in FIG. 2B, the two scroll bodies 10a are arranged such that the magnetic poles of the magnetic part 14 provided on the outer peripheral portion of each scroll body 10a face each other. Further, a magnetic field in a direction different from the magnetic pole direction of the magnetic part 14 is applied from the stator part 30 to the magnetic part 14.
In the example of FIG. 2B, for example, the upper scroll body 10
The magnetic portion 14a has an N pole on the upper surface of the disk 11, and the magnetic portion 14 of the lower scroll body 10a has an S pole on the upper surface of the disk 11. Therefore, for example, in the example shown in the drawing, by generating a magnetic field from the top to the bottom in the stator portion 30, a magnetic force toward the inside is generated in the upper scroll body 10a, and a magnetic force toward the outside is generated in the lower scroll body 10a. A magnetic force is generated. In this way, by sequentially generating a magnetic field in the same direction in the stator unit 30, the phase becomes approximately 18
Start a revolution that differs by 0 °.

As a result, the entire center of gravity during driving is shifted by the upper scroll body 10a and the lower scroll body 10a.
a and the vibration and noise can be reduced.

These scroll type pumps 1 can be provided with a restraining mechanism as shown in FIG.
The restraining mechanism includes a substantially cylindrical concave portion 28 provided on one of the fixed plates 21, a cam portion 29 rotatably fitted in the concave portion 28, and an eccentric provided on the lower surface of the movable scroll portion 10. And a shaft 16. Recess 28
Are provided on the outer periphery of the scroll blades 22 of the fixed scroll portion 20 at substantially left-right symmetric positions. The cam portions 29 are each provided with an eccentric hole 29a in which the eccentric shaft 16 can be inserted. The eccentric shaft 16 rotates according to the orbit of the movable scroll unit 10. Therefore, the cam portion 29 into which the eccentric shaft 16 is inserted with the rotation is
An eccentric hole 29a is formed so as to rotate inside. That is, the movable scroll unit 10 is controlled by the rotation of the cam unit 29, and the movable scroll unit 10 always draws a constant orbit. As a result, the radial gap between the scroll blades 22 of the fixed scroll portion 20 and the scroll blades 12 of the movable scroll portion 10 is kept constant, so that air leakage is reduced and pump efficiency is improved.

The scroll type pump 1 is provided with at least two restraining mechanisms. As a result, the rotation of the movable scroll portion 10 can be suppressed by a plurality of restraining mechanisms.

FIG. 9 is a sectional view of a scroll pump 1 according to still another embodiment of the present invention. This scroll type pump 1 has substantially the same configuration as the scroll type pump 1 shown in FIG. 1, but is provided with a tension spring 40 for pulling the upper and lower fixed plates 21 together instead of the restraining mechanism in the direction of the revolution axis. ing. Further, bearing balls 26 are arranged on both sides of the disk 11, and the two fixed plates 21 and the bearing balls 26 which are pulled by the disk 11
Are rotatably provided. As a result, the two upper and lower fixed plates 21 are pulled by these two tension springs 40, and the gap between the iron core 31 of the stator portion 30 and the fixed plate 21 is absorbed. Therefore, the movable scroll part 1
0, the pump accuracy is determined by the fixed scroll portion 20 and the bearing ball 26, and the scroll type pump 1 with high accuracy without air leakage can be provided without depending on the manufacturing accuracy of the iron core 31.

In the scroll type pump 1 shown in FIG. 10, an air discharge port 24 and an air suction port 25 are formed in one of the fixed plates 21. As shown in FIG. 11, two vents 15 are opened in the movable scroll part 10 of the scroll pump 1 and one vent 15
Is provided near the outer peripheral portion of the movable scroll portion 10 corresponding to the air intake port 25, and the other ventilation port 15 is provided near the center of the scroll blade 12 corresponding to the air discharge port 24.

In this pump 1, the movable scroll portion 10
Is compressed on both sides of the movable scroll portion 10 on the side without the air discharge port 24, and the compressed air is sent from the ventilation port 15 to the pump chamber on the air discharge port 24 side. As a result, one compression chamber (pump chamber) is formed as a whole, and the pump pressure can be increased. Air outlet 2
4. The air suction port 25 can be concentrated at one location on one side of the pump 1, so that piping can be facilitated.

As described above, according to the present invention, the pump chamber is formed on both sides of the orbiting scroll portion 10, so that the scroll type pump 1 which is thin and has a large pump capacity can be provided.

[0039]

According to the present invention, scroll blades are provided on both sides of a disk constituting a movable scroll, and a magnetic portion is provided on an outer peripheral portion of the disk. Since the stator is disposed, the pump chambers are formed on both sides of the movable scroll, and the actuator is disposed around the movable scroll. As a result, a thin and large-capacity scroll pump can be provided.

At this time, by making the scroll blades symmetrical with respect to the disk, a pump having a pump capacity almost twice that of the conventional pump can be obtained. Further, by making the plane symmetrical with respect to the disk, fluctuations in torque of the pump are reduced, and vibration and noise can be reduced. Further, by providing scroll blades having different compression ratios, a single pump can supply compressed air having different air pressures.

Further, an air discharge port and an air suction port are opened in one of the fixed scroll portions, and a disk of the movable scroll portion is provided immediately below the air discharge port and near the air suction port. The provision of the through-hole allows the pump pressure to be increased.

In the present invention, the movable scroll portion is provided with a scroll blade protruding from one side of a disk,
In addition, a scroll body having a magnetic portion made of a magnetic material on the outer periphery of the disk may be arranged so that the magnetic poles of the magnetic portion face each other. The movement of the entire center of gravity at the time is canceled by the upper scroll body and the lower scroll body, so that vibration and noise can be reduced.

In these scroll pumps,
By providing a mechanism for restraining the revolving orbit on the outer peripheral side of the orbiting scroll portion, air leakage is reduced and pump efficiency can be improved.

By providing the restraining mechanism at two or more places or by providing the restraining mechanism in the axial direction, the rotation of the movable scroll portion can be prevented, the stable pump operation can be performed, and the leakage can be performed with high precision. A scroll pump can be provided.

Alternatively, by providing a tension spring between the two fixed plates, it is possible to provide a scroll type pump having a simple structure and less air leakage.

[Brief description of the drawings]

FIG. 1 is a view showing a scroll type pump according to an embodiment of the present invention, wherein FIG. 1 (a) is a sectional view and FIG. 1 (b) is a plan view.

FIG. 2 is a view showing a movable scroll portion used in the scroll pump according to the first embodiment; FIG.
FIG. 1B is a perspective view seen from above, and FIG. 1C is a perspective view seen from below.

FIGS. 3A and 3B are explanatory diagrams showing the operation of the above scroll pump, wherein FIG. 3A is an explanatory diagram showing one pump chamber side, and FIG. 3B is an explanatory diagram showing the other pump chamber side. It is.

FIGS. 4A and 4B are views showing a movable scroll portion used in a scroll pump according to another embodiment of the same, wherein FIG. 4A is a sectional view thereof and FIG. 4B is a perspective view seen from above. FIG. 2C is a perspective view seen from below.

FIGS. 5A and 5B are explanatory diagrams showing the operation of the scroll type pump, in which FIG. 5A is an explanatory diagram showing one pump chamber side, and FIG. 5B is an explanatory diagram showing the other pump chamber side. It is.

FIG. 6 is a view showing a movable scroll portion used in a scroll pump according to still another embodiment of the above;
FIG. 1A is a sectional view thereof, FIG. 1B is a perspective view seen from above, and FIG. 1C is a perspective view seen from below.

FIG. 7A is a cross-sectional view showing a scroll type pump according to still another embodiment of the above, and FIG. 7B is a view showing a part of a stator part thereof.

FIG. 8 is a sectional view showing a scroll type pump according to still another embodiment of the above.

FIG. 9 is a sectional view showing a scroll type pump according to still another embodiment of the above.

FIG. 10 is a sectional view showing a scroll type pump according to still another embodiment of the above.

11A and 11B are diagrams showing a movable scroll portion used in the scroll pump of the above, wherein FIG. 11A is a sectional view thereof, FIG. 11B is a perspective view seen from above, and FIG. Is a perspective view seen from below.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll pump 10 Movable scroll part 11 Disk 12 Scroll blade 14 Magnetic part 15 Vent 20 Fixed scroll part 21 Fixed plate 22 Scroll blade 23 Scroll groove 24 Air discharge port 25 Air suction port 26 Bearing ball 27 Spring 28 Concave part 29 Cam part Reference Signs List 30 Stator part 31 Iron core 32 Coil 40 Tension spring

Claims (11)

[Claims] 1. A movable scroll portion provided with a scroll blade protruding on both sides of a disk, and having a magnetic portion made of a magnetic material on an outer peripheral portion of the disk, and two movable scroll portions provided on both sides of the movable scroll portion. On each inner surface of the fixing plate of
A fixed scroll portion made to protrude a scroll blade combined with a scroll blade of the movable scroll portion,
A scroll type pump comprising: a fixed iron core disposed along a circumcircle of a revolving orbit of the movable scroll portion; and a stator portion including a plurality of coils wound around the fixed iron core. 2. The scroll type pump according to claim 1, wherein scroll blades that are line-symmetric with respect to the disk are provided on both sides of the disk. 3. The scroll type pump according to claim 1, wherein scroll blades are provided on both sides of the disk so as to be plane-symmetric with respect to the disk. 4. An air discharge port and an air suction port are opened in one of the fixed scroll portions, and a disk of the movable scroll portion is provided near the air discharge port and near the air suction port. The scroll type pump according to any one of claims 1, 2 and 3, further comprising a ventilation hole penetrating therethrough. 5. The scroll blades having different compression ratios are provided on both sides of the disk.
5. The scroll pump according to any one of 3 and 4. 6. The movable scroll portion includes a scroll body provided with a scroll blade protruding from one surface of a disk and a magnetic portion made of a magnetic material on an outer peripheral portion of the disk, wherein the magnetic pole of the magnetic portion has the same polarity. 6. The device according to claim 1, wherein the members are arranged so as to face each other.
A scroll type pump according to any one of the above. 7. A scroll type pump according to claim 1, wherein a mechanism for restraining a revolving orbit is provided on an outer peripheral side of said movable scroll portion. . 8. A mechanism for restraining the orbit, the eccentric shaft provided on at least one side of the disk, a concave portion provided inside the fixed plate, and a cam portion rotatably fitted in the concave portion. The scroll pump according to claim 7, further comprising: an eccentric hole into which the eccentric shaft is inserted. 9. The scroll type pump according to claim 8, wherein a mechanism for restraining the orbit is provided at two or more positions. 10. The scroll pump according to claim 1, further comprising an axial restraint mechanism for the movable scroll portion. 11. A tension spring is provided between the two fixing plates.
Or the scroll type pump according to any one of 6.