JPH01302A - scroll fluid machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention rotates a driving scroll and a driven scroll. This article relates to a fully rotating scroll fluid machine.

[Conventional technology]

Generally, as this type of scroll fluid machine, a scroll compressor, which is a type of volumetric expansion compressor that performs compression by combining a pair of spiral protrusions, is widely known.

Normally, the operating principle of this type of scroll compressor is that one vortex has a fixed protrusion and the other vortex has a pulsating motion to perform compression, as disclosed in U.S. Pat. No. 3,884,599.
and US Pat. No. 2,475,247.

Further, in this type of scroll compressor, both spiral protrusions are rotated around their respective centers. A so-called fully rotating type is also known from the above-mentioned US patent.

Next, the principle of this fully rotary scroll compressor will be explained. As shown in FIG.
The driving scroll 1 rotates around its axis 02, and in synchronization with this rotation, the driven scroll 2 also rotates around its shaft center 02. Therefore, due to the rotation of both, the compression chamber 3 between the spiral protrusions 1a and 2a moves toward the center, thereby reducing its volume and increasing the pressure of the compressed gas.
This gas is discharged as high pressure gas from the discharge port 2C. Here, the state of Oo in the same figure (a) is the compression chamber 3
This is the state in which gas is inhaled in the same figure (bl~(dl), 0'-90°-1806-270°-360°.
(0°) rotation causes the compression chamber 3 to gradually move toward the center and reduce its volume. During this time, both scrolls 1 and 2
The whorl body la.

It can be seen that the radial seal portions S by 2a are lined up in a straight line in the radial direction and occupy a fixed position in a stationary state.

By the way, in order to transmit the rotational force of the driving scroll 1 to the driven scroll 2, as described in the specification of US Pat. No. 2,475,247, both scrolls 1.2
A joint (not shown) that connects the driving scroll and the driven scroll so as to be displaceable in the X-Y direction may be provided on the axis center side between them, or a joint as described in the earlier specification of U.S. Pat. No. 3,884,599. (not shown) is arranged near the outside in the radial direction between both scrolls 1.2.

[Problems to be Solved by the Invention] However, in conventional scroll fluid machines, a joint is disposed between both scrolls, so after disposing a joint on one scroll, it is difficult to connect the other scroll. When these scrolls are combined, the joint is covered by the other scroll, making it extremely difficult to align the scroll and the joint, complicating the work of assembling the joint. In addition, due to the wear of the joint, the abrasion powder tends to directly enter between the spiral projections, accelerating the wear of both spiral projections, and as a result, the sealing properties between the spiral projections deteriorate in a short period of time, causing the compressor to In the case of a vacuum pump, the compression efficiency decreases, and in the case of a vacuum pump, there is also a problem that the degree of vacuum decreases. Furthermore, when the joint wears out, it is necessary to remove the scroll, resulting in the inconvenience that maintenance must be performed on the surface.

The present invention was made in view of these circumstances, and it provides a scroll fluid that not only makes it extremely easy to assemble and maintain the joint, but also guarantees the sealing ability between both spiral protrusions over a long period of time. It provides machinery.

[Means for solving problems]

A scroll fluid machine according to the present invention includes a first scroll rotated by a drive source, a second scroll eccentric to the axis of the first scroll, and an axially outer side of one of the two scrolls. a joint that is disposed on the end face side and is engaged at two positions in the circumferential direction of the scroll and is movable in radial directions perpendicular to each other; A connecting arm provided on the scroll is provided, and the engaging position of the connecting arm and the engaging position of the joint are each positioned on a line orthogonal to each other.

[For production]

In the present invention, the joint can be displaced with respect to one scroll in the X direction, for example, and the joint can be displaced with respect to the other scroll in the Y direction perpendicular to the X direction via the connecting arm, so that each scroll is eccentric to each other. It is possible to rotate in this position.

〔Example〕

FIG. 1 is a vertical sectional view showing a scroll vacuum pump as a scroll fluid machine according to the present invention, FIGS. 2(a) and (b) are side and front views showing the connecting arm of the scroll vacuum pump, The figure is a plan view showing the joint, Figure 4 (a
) and (b) are a local sectional view and a plan view showing the driving scroll. In the figure, the reference numeral 1 indicates a cylindrical first container having a suction chamber 2 therein, and mounting flanges 3.4 are integrally provided at both open ends. , 4 are fixed to an upper bearing housing 5 and a lower bearing housing 6 via O-rings 7.8. Further, a suction pipe 9 opening laterally is attached between both flanges 3.4 of the container l. Reference numeral 10 designates a cylindrical second container having an atmospheric pressure chamber 11 therein, and mounting flanges 1 having different outer diameters at both open ends.
2.13 is integrally provided, and is attached to the first container l via the flange 5a of the upper bearing housing 5 with bolts 14. Also, between both flanges 12 and 13 of this container 1o is a discharge pipe 15 that opens laterally.
is installed. Reference numeral 16 denotes a motor whose output shaft 16a partially faces the inside of the atmospheric pressure chamber 9, and a motor flange 18 is fixed to the flange 12 of the second container 10 by bolts 17. Reference numeral 19 denotes a driving scroll as a first scroll, which has a circular end plate 19a and a spiral protrusion 19b, and is rotatably housed inside the first container 1. On the back side of the end plate 19a of this drive scroll 19, each side is 180 degrees from each other in the circumferential direction.
Notch grooves 20° 21 are formed at two spaced apart positions, and keys 22° 23, a portion of which is exposed outside the premises, are located inside these notched grooves 20° 21, respectively, by means of ports 24 and 25. Fixed. At the center of the end plate 19a of the drive scroll 19, an exhaust passage 26a extending in the direction of the central axis and a plurality of discharge holes 2 opening in the radial direction are provided.
A drive shaft 26 having a diameter 6b is integrally provided. This drive shaft 26 has a bearing 27 attached to the upper bearing housing 5.
It is rotatably inserted and held through a shaft 28 and connected to the output shaft 16a by a shaft coupling 29. Further, the drive shaft 26 and the drive scroll 19 are provided with a discharge chamber 30 that communicates with the exhaust path 26a.

Reference numeral 31 denotes a check valve for passage of compressed fluid, which is provided inside the discharge chamber 30 so as to be openable and closable. Reference numeral 32 denotes a driven scroll as a second scroll, which has a circular end plate 32a and a spiral protrusion 32b, is rotatably provided inside the first container 1, and is located below the driving scroll 19. is provided and configured to cooperate with the drive scroll 19 to compress the fluid within the compression chamber 33. 34 is a boss having an axis 01 of the drive scroll 19, that is, an axis 02 eccentric to the drive shaft 26;
A bearing 35 is integrally provided at the center position of the end plate 32a of the driven scroll 32, and a bearing 35 is provided in the lower bearing housing 6.
, 36, and is rotatably supported. Reference numeral 37 designates a joint for transmitting rotational force, which is comprised of a base 38 formed of an annular body and 4 m long ribs 39 provided at 90° intervals in the circumferential direction of this base 38; The key 22 is disposed on the outer end surface side of the scroll 19 in the axial direction, that is, on the back side of the end plate 19a.
．． 23, it is engaged at two positions in the circumferential direction of the drive scroll 19. Guides m39a and 39b are formed between each set of ribs 39 of this joint 37, into which one end of a connecting arm and keys 22 and 23, which will be described later, are slidably fitted, respectively. Reference numerals 40 and 41 are connection arms having a U-shaped cross section, each of which has one end fixed to the end of the driven scroll 32 of both scrolls by a pole 42, 43, and the other end fixed to the periphery of the joint 37. It is fixed in two positions in the direction. The engagement positions of these connecting arms 40 and 41 and the joint 3
The locking positions 7 are located on lines that are perpendicular to each other. Further, 44 is a locking plate that locks the upper bearing 27 of the two bearings 27 and 28 in the upper bearing housing 5, 45 is a screw that fixes this locking plate 44 to the upper bearing housing 5, and 46 and 47 is the drive shaft 2
A sealing member 48 is installed around the atmospheric pressure chamber 11 and the suction chamber 2 to seal between the atmospheric pressure chamber 11 and the suction chamber 2.
．． 47 is a retaining ring that supports the seal member 47 in the upper bearing housing 5, 49 is a spring that biases the check valve 31 in the discharge port 30 in the closing direction, and 50 is a retaining ring that supports the seal member 47 in the upper bearing housing 5; This is a bolt that fixes one container 1.

A container to be evacuated (not shown) is connected to the open end of the suction pipe 9 on the externally exposed side.

In the scroll vacuum pump configured as described above, when the driving scroll 19 rotates around the shaft center 01 by driving the motor 16, the driven scroll 32 rotates synchronously around the shaft center 0□. At this time, the joint 37 on the drive scroll 19 and the connecting arm 40.41 cause both scrolls 19.32 to rotate at exactly 180[deg.] twisted position. Furthermore, parts of the protrusions 19b and 32b come into contact with each other, so that the compression chamber 33 is completely sealed and the degree of vacuum is increased. When the fluid in the container to be evacuated (not shown) is sucked into the suction chamber 2 from the suction pipe 9 by the rotation of both scrolls 19° 32, it is compressed in the compression chamber 33 and causes the check valve 31 to close. Open, exhaust passage 26a, discharge hole 26b
, and is discharged into the atmosphere from the discharge pipe 15 via the atmospheric pressure chamber 11.

Here, to explain in detail the rotational force transmission state from the drive scroll I9 to the driven scroll 32, the keys 22 and 23 on the end plate 19a of the drive scroll 19 fit into the guide groove 39b of the joint 37; The rotational force of the drive scroll 19 is transmitted to the joint 37 via the keys 22.23. At this time, since one end of the connecting arm 40.41 fits into the guide groove 39a of the joint 36 at a position orthogonal to the key 22.23, the connecting arm 40.41 has the advantageous position.
7 and the driven scroll 32 rotates. That is, both guide grooves 39a of the joint 37.

The guide grooves 39b are formed in the X direction and the Y direction, which are perpendicular to each other, and a key 22, 23 that is slidable in the X direction is fitted into one of the guide grooves 39b, and a key 22, 23 that is slidable in the X direction is fitted into the guide groove 39b. 39a is fitted with one end of each connecting arm 40, 41 that is slidable in the Y direction, so that when the drive scroll 19 rotates around the axial center 0, the joint '37 moves relative to the drive scroll 19, e.g. The joint 37 can be displaced in the direction of the driven scroll 32, and the coupling arm 4
0.41 in the Y direction, and the driven scroll 32 rotates around the axis center 0□.

Although the present embodiment shows an example in which the joint 37 is disposed on the drive scroll 19 side, the present invention is not limited to this, and as shown in FIGS. It may be arranged on the 32 side. In this case, the seventh
The two support plates 50, 51 shown support the joint 37 and are fixed to the driven scroll 32 by screws 52. Thereby, the sliding portion of the joint 37 can be cooled by the lubricating oil in the first container 1.

Furthermore, in this embodiment, the connection 115i! 40.41
Although the connecting arm 53 is formed to have a U-shaped cross section, the present invention may also have a connecting arm 53 having an L-shaped cross section as shown in FIGS. 8(a), (b) and 9. In the figure, an extending portion 55 having a reinforcing wall 54 around the driven scroll 32
A bolt 5 is provided on the reinforcing wall 54 of this extension portion 55.
The connecting arm 53 is fixed by 6. In this case, the connecting arm 57 may be integrally provided with the driven scroll 32 as shown in FIGS.
By setting the outer shape to different dimensions, it can be used as a balance weight for the driven scroll 32.

Furthermore, in this embodiment, the base 38 is used as the joint 37.
However, the present invention has a rib 39 formed around the drive scroll 19 shown in FIG. 13 on the non-sliding surface side of the base 58 as shown in FIGS. Even if the joint 61 is formed with a rib 60 into which the joint 60 is fitted, the same effect as in the embodiment can be obtained.As a result, only a couple acts on the joint 61 during use, so smooth operation is possible. Not only this, but also the noise caused by vibration can be suppressed.Here, the joint 61 shown in Fig. 14 (
As shown in a) and (b), instead of providing the rib 60, a guide groove 91 into which the key 90 fits may be formed directly on the non-sliding surface side of the joint 92.

Furthermore, in this embodiment, the keys 22, 23 and the connecting arms 40, 41 are used as guides 39b, 3 of the joint 37.
Although an example of simply sliding inside 9a has been shown, the present invention also allows sliding through a lubricant 62 as shown in FIG. 15, or through a rotating body 63 as shown in FIG. By moving the guide grooves 39a and 39b, each member can slide smoothly. In this case, in the former case, the sliding surface 6 between the key 22.23 and the guide groove 39b
4, a space 66, 67 that can be filled with lubricant 62 is formed on the sliding surface 65 between the connecting arm 40, 41 and the guide groove 39a, and in the latter, a bearing 68 is formed in the rib 39 of the joint 37. installed.

In addition, in this embodiment, the case where the joint 37 is simply arranged on the end plate 19a of the drive scroll 19 is shown;
As shown in FIGS. 17 and 18(a) and 18(b), the present invention reduces wear of both members by interposing a steel ball 69 between the end plate 19a and the joint 37 so as to freely rotate. can be done. In this case, a concave portion 70 is provided on the back surface of the end plate 19a in consideration of workability during assembly, but the joint 3
A recess (not shown) may be provided on the 19th side.
As shown in FIG. 20 and FIG. 20, recesses 71a, 71b, and 12a-72b may be provided in the drive scroll 19 and the joint 37, respectively, and furthermore, as shown in FIG.
3 on the driven scroll 32 side, a steel ball 75 may be interposed between the lower bearing housing 74 and the joint 73 so as to freely rotate.

Incidentally, in this embodiment, since the keys 22, 23 and the connecting arms 40, 41 are fixed to the drive scroll 19 and the driven scroll 32 by respective bolts, the joints 37, 37, 37, 42, 42, 41, 41, 41, 41, 42, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 41, 42, 42, 37, 37, 33, 33, 42, 22, 32,32,433,34,41,32,32,23,32,23,32,32,32,23, 40, 41, 40, 40, 40, 40, 41, 40, 41, 40, 41, 40, 41 are fixed to the driving scroll 19, Drive Scroll 19, Drive Scroll 32 by respective bolts are fixed. Keys 22 and 23 and connecting arms 40 and 41
can be attached and detached for easy maintenance.

Furthermore, although this embodiment shows an example of application to a scroll vacuum pump, the present invention is not limited to this.
Of course, it can be applied to scroll compressors.

〔Effect of the invention〕

As explained above, according to the present invention, there is provided a first scroll rotated by a drive source, a second scroll eccentric to the axis of the first scroll, and an axis of one of the two scrolls. a joint disposed on the outer end face side of the scroll and movable in two positions in the circumferential direction of the scroll, each of which is displaceable in a radial direction orthogonal to each other; and a connecting arm provided on the other scroll, and the engaging position of the connecting arm and the engaging position of the joint are located on lines perpendicular to each other, so it is easy to assemble the joint and the scroll. The assembly work can be simplified.

Furthermore, since the joint can be attached and removed while both scrolls are combined, maintenance can be simplified.

Furthermore, even if the joint is worn out, it is possible to prevent abrasion powder from directly entering the scroll, so that the sealing ability between both spiral protrusions can be guaranteed for a long period of time.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a scroll vacuum pump as a scroll fluid machine according to the present invention, FIGS. 2(a) and (b) are side and front views showing the connecting arm of the scroll vacuum pump, The figure is a plan view showing the joint, Figure 4 (a
) and (ill are local sectional views and plan views showing the driving scroll, FIGS. 5 and 6 are front views and bottom views when the joint is disposed on the driven scroll side, and FIG. 7 is a partial sectional view and a plan view showing the driving scroll. 7 is a front view showing the support plate, FIGS. 8(a) and (b) are a plan view and a cross-sectional view showing the mounting structure of the connecting arm to the driven scroll, and FIG. 9 is a scroll fluid having the mounting structure. A vertical cross-sectional view showing the machine, FIG. 10 (al and (bl) are a plan view and a cross-sectional view showing the mounting structure of the connecting arm to the driven scroll, and FIG. 11 is a vertical cross-sectional view showing the scroll fluid machine having the mounting structure. , Fig. 12(a) and (
b) is a plan view and a sectional view showing a joint in another embodiment;
13(a) and (b) are a front view and a plan view showing the key, FIG. 14 (al and (bl) are a plan view and a front view showing the engagement structure of the joint to the drive scroll, and FIG. 15 and FIG. 16 is a plan view showing the engagement structure of the joint in another embodiment, FIG. 17 is a longitudinal sectional view showing another embodiment, and FIG.
8fal and (b) are a plan view and a sectional view showing the driving scroll, FIG. 19 is a longitudinal sectional view showing another embodiment from FIG. 17, FIG. 20 is a plan view showing the joint, and FIG. The figure is a longitudinal sectional view showing an example in which the joint is disposed on the driven scroll side, and FIGS. 22(d) to 22(d) are diagrams for explaining the principle of the scroll fluid machine. 16... Motor, 19... Drive scroll /l/
, 32... Driven scroll, 37... Joint, 3
8...Base, 39...Rib, 39a, 39b
・ ・ ・ ・Guide groove, 40.41...Connecting arm. Agent Masuo Oiwa Figure 1 Figure 2 (a) (b) Figure 3 3.9゜9G Figure 4 (a) (b) Figure 5 ('12I Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 [:!i ri fτ 14 Figure 15 Figure 16 Figure 17 Figure 18 Figure 19b Figure 19 Figure 20 Figure 21 Figure 22 (a3

Claims (10)

[Claims] (1) A first scroll rotated by a drive source, a second scroll that is eccentric with respect to the axis of the scroll and works with the first scroll to compress fluid; a joint disposed on the axially outer end surface of one of the scrolls, engaged at two positions in the circumferential direction of the scroll, and movable in radial directions perpendicular to each other; a connecting arm that is attached to the other scroll of the two scrolls, and the engagement position of the coupling arm and the engagement position of the joint are located on lines perpendicular to each other; A scroll fluid machine featuring: (2) The scroll fluid machine according to claim 1, wherein the joint is disposed on the first scroll side. (3) The scroll fluid machine according to claim 1, wherein the joint is disposed on the second scroll side. (4) The joint is constituted by an annularly formed base and a rib that forms a guide groove extending radially around the base. Scroll fluid machine according to item 3. (5) The scroll fluid machine according to claim 1, 2 or 3, wherein the joint is constituted by an annular body having a guide groove extending in the radial direction on the non-sliding surface side. . (6) The scroll fluid machine according to claim 5, wherein the guide groove is formed by a rib. (7) The scroll fluid machine according to claim 1, wherein the connecting arm has a U-shaped cross section. (8) The scroll fluid machine according to claim 1, wherein the connecting arm has an L-shaped cross section. (9) The scroll fluid machine according to claim 1 or 8, wherein the connecting arm is integrally provided on one scroll. (10) The scroll fluid machine according to claim 1 or 8, wherein the connecting arm and one scroll are separate bodies.