JP2001221176A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll fluid machine for attaining compatibility between prevention of breakage in a chip seal fitted to a fixing scroll, especially an outer peripheral side end part, and improvement of compression performance. SOLUTION: The outer peripheral side end part 13a of a chip seal 13 attached to a tip end part 9d of a fixing side spiral body 9b in a fixing scroll, is positioned in the vicinity of an outside of a turning locus formed by an outer peripheral end of a turning side end plate 11a of a turning scroll.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine such as a scroll type compressor used for a refrigerating device or an air conditioner.

[0002]

2. Description of the Related Art Conventionally, a scroll-type fluid machine such as a scroll-type compressor has a scroll-type compression mechanism provided with a fixed scroll, an orbiting scroll, and a rotation preventing mechanism. In this scroll-type compression mechanism, one fixed scroll is an immovable scroll fixedly supported in a housing to which the suction pipe and the discharge pipe are connected. The other orbiting scroll is arranged so as to mesh with the fixed scroll in the up / down or left / right direction, is prevented from rotating by a rotation preventing mechanism, and is connected to a driving source such as an electric motor to orbit with respect to the fixed scroll. Exercise. This orbiting scroll contacts the fixed scroll at a plurality of contact points to form a crescent-shaped compression chamber, and the compression chamber moves inward while reducing the volume from the outer peripheral side, thereby performing suction, compression, and discharge. Can be done simultaneously.

In the above-described fixed scroll and orbiting scroll, a seal member called a tip seal is fitted on the tip end surface of a spiral body protruding from each end plate. This tip seal has a function of sealing the gap between the low pressure side and the high pressure side in close contact with the end plate contact surface of the counterpart scroll at the end surfaces of the scrolls of the fixed scroll and the orbiting scroll which perform a relative orbiting motion. Have. FIG. 7 shows a conventional fixed scroll and will be briefly described. The fixed scroll of FIG. 7 is a plan view as viewed from the spiral body side. In the figure, reference numeral 9 denotes a fixed scroll, 9b denotes a fixed spiral body, 13 denotes a chip seal, and 14 denotes a discharge port. A spiral tip seal 13 is provided with a seal groove on the tip end surface 9d of the fixed spiral body 9b protruding from the fixed end plate 9a. The tip seal 13 has a rectangular cross-sectional shape over the entire length. As shown in FIG. 8, the tip seal 13 receives the pressure of the compressed fluid introduced into the space SP in the seal groove 9e and receives the pressure from the counterpart (orbiting scroll side). The sealing surface is brought into close contact with the contact surface (turning end plate 11a) to seal the sliding portion.

[0004]

By the way, in the above-mentioned conventional scroll type fluid machine, the outer peripheral side winding end (hereinafter referred to as the outer peripheral end) of the tip seal 13 fitted on the fixed scroll 9 side. Has a problem as described below. That is, FIG.
As shown in FIG. 3, the outer peripheral end 13a of the tip seal 13 is turned while the orbiting scroll 11 is being turned.
(In other words, when the outer peripheral end 13a is positioned outside the turning locus drawn by the revolving turning motion of the turning end plate 11a).
FIG. 9 (b) shows that there is no contact surface for receiving and supporting the portion pushed out from the seal groove 9e under the fluid pressure.
As shown in FIG. 7, the outer peripheral end 13a may be bent and damaged. As a countermeasure against this, as in another conventional example shown in FIG. 10, the outer peripheral side end portion 13a of the tip seal 13 fitted on the fixed scroll 9 side is disposed inside the turning locus drawn by the turning side end plate 11a. Although it is also possible, the shortening of the tip seal 13 lowers the sealing performance, which causes a new problem in that it is disadvantageous in terms of compression performance.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a scroll type fluid machine capable of achieving both a tip seal fitted to a fixed scroll, in particular, prevention of breakage at an outer peripheral end and good compression performance.

[0006]

The present invention employs the following means to solve the above-mentioned problems. The tip seal according to claim 1, wherein a housing that forms a closed space and connects the suction pipe and the discharge pipe, a fixed scroll fixed and supported in the housing, and meshed with the fixed scroll, The orbiting scroll, which is prevented from rotating and performs a revolving orbiting motion, and the fixed scroll and the orbiting scroll, which are fitted on the distal end surfaces of the spiral bodies protruding from the end plates of the orbiting scroll, are each in close contact with the contact surface of the counterpart scroll. A tip seal for sealing between the low pressure side and the high pressure side; and a driving means for the orbiting scroll, wherein the fixed scroll and the orbiting scroll contact at a plurality of contact points to form a crescent-shaped compression chamber. Then, the compression chamber moves inward while reducing the volume from the outer peripheral side to simultaneously perform suction, compression, and discharge, and furthermore, the outer diameter of the end plate of the fixed scroll increases. A scroll-type fluid machine having an end plate outer diameter larger than an orbiting scroll end plate, wherein the fixed scroll side tip seal has an outer peripheral end near an outer periphery of a orbital locus formed by the orbiting scroll end plate outer peripheral end. Characterized in that it is mounted so as to be located at

[0007] According to such a scroll type fluid machine, the sealable area can be extended to the maximum as long as the outer peripheral end of the tip seal does not float, so that breakage of the tip seal is prevented and the compression performance is reduced. Can be improved. In this case, the outer peripheral end of the tip seal preferably has at least a spiral inner peripheral line on or near the swirl locus.
The length of the outer peripheral end portion without the counterpart contact surface for preventing the outer peripheral end portion from rising is short from the turning trajectory, making it difficult to float. Further, the outer peripheral end of the tip seal preferably has a curved surface portion substantially similar to a revolving locus formed by the outer peripheral end of the end plate of the orbiting scroll. The length of the outer peripheral end portion without the contact surface is almost constant and short from the turning trajectory, so that it is difficult to float.

According to a fourth aspect of the present invention, there is provided a scroll type fluid machine, wherein a housing which forms a space and connects a suction pipe and a discharge pipe, a fixed scroll fixedly supported in the housing, and the fixed scroll are engaged with each other. A orbiting scroll which revolves orbits while being prevented from rotating with respect to the fixed scroll; and a contact surface of a spiral body which is fitted on a tip end surface of a spiral body protruding from an end plate of the fixed scroll and the orbiting scroll, each of which is a contact surface of a counterpart scroll. A tip seal that tightly seals between the low-pressure side and the high-pressure side, and a driving means for the orbiting scroll, wherein the fixed scroll and the orbiting scroll contact at a plurality of contact points to form a crescent-shaped A scroll-type fluid machine that forms a compression chamber, moves inward while reducing the volume from the outer circumference side, and simultaneously performs suction, compression, and discharge. It, tip seal of the fixed scroll side, and is characterized in that it comprises an inclined portion that is shaped to receding from the counterpart contact surface in a natural state the sealing surface of the outer peripheral side end portion.

According to such a scroll type fluid machine, the inclined portion receiving the fluid pressure rises and forms substantially the same sealing surface from the inner peripheral end to the outer peripheral end, so that the entire length of the tip seal is maintained. There is no risk of damage,
In addition, the sealing performance can be improved by the extent that the sealing length can be extended.

[0010]

FIG. 5 shows a scroll type compressor as an embodiment of the scroll type fluid machine according to the present invention. The illustrated scroll compressor 1 is of the so-called hermetic type. This scroll compressor 1 includes a housing 2 having a bottomed cylindrical shape, a scroll-type compression mechanism 4 supported by a frame 3 at an upper portion inside the housing 2, and a scroll-type compression mechanism 4 below the scroll-type compression mechanism 4, that is, inside the housing 2. A motor 5 of a driving means supported and disposed by the frame 3 is provided at a lower portion, and a rotary shaft 6 of the motor 5 is connected to a lower portion of the scroll-type compression mechanism 4.

In the housing 2, the lower end and the upper end of the cylindrical portion 2a are closed by a bottom portion 2b and a lid portion 2c, respectively. A suction pipe 7 is connected to the cylindrical portion 2a so as to penetrate the inside thereof. 2c forms a closed space in which the discharge pipe 8 is connected to protrude inside. The scroll-type compression mechanism 4 includes a fixed scroll 9 fixed to the frame 3.
A revolving scroll 11 supported between the frame 3 and the fixed scroll 9 via a thrust bearing 10 so as to be capable of revolving revolving motion, and a revolving revolving motion of the revolving scroll 11 provided on an outer surface of the revolving scroll 11 is allowed. A rotation prevention mechanism 12 including a well-known Oldham link or the like for preventing the rotation.

The fixed scroll 9 has a fixed end plate 9a.
A spiral fixed-side spiral body 9b erected on the inner surface of the fixed-side end plate 9a; and a cylindrical peripheral wall 9c formed on the peripheral edge of the fixed-side end plate 9a. A tip seal 13 having elasticity is fitted on the tip end surface 9d of the spiral body 9b. The tip seal 13 is preferably made of a heat-resistant and abrasion-resistant resin containing carbon. For example, a polyphenylene sulfite resin is used. The fixed-side end plate 9a has a discharge port 14 formed at the center thereof so as to penetrate vertically, and a discharge valve 15 for opening and closing the discharge port 14 is provided on the upper surface thereof.

At the upper end of the peripheral wall 9c, a cavity lid 16 is fixed in a confidential state, and a discharge cavity 17 is formed inside. The opening end of the discharge pipe 8 is fixed to the cavity lid 16 in a penetrating state.
And the discharge cavity 17 are connected. In addition, a suction passage 18 is formed in the peripheral wall portion 9c to communicate the inner surface of the fixed end plate 9a with the housing 2 side.
Is connected to a suction chamber 19 formed between the fixed scroll 9 and the orbiting scroll 11.

The orbiting scroll 11 is meshed with an orbiting end plate 11a arranged opposite to the fixed end plate 9a and a fixed scroll 9b provided upright on the inner surface of the orbiting end plate 11a. And a spiral seal 11b having a spiral shape, and a tip seal 13 made of PPS or the like is fitted on a tip end surface of the spiral swirl 11b. The turning side end plate 1
1a, a cylindrical boss 20 is erected on its outer surface with the same axis, and a bush 21 is provided inside the boss 20.
Are rotatably fitted via a swivel bearing 22. The bush 21 has a through hole 21a formed therein, which is eccentric from the axis.

In a state where the fixed scroll 9 and the orbiting scroll 11 are eccentric by a predetermined distance from each other, the fixed scroll 9b and the orbiting scroll 11b are rotated by 180 degrees so that the side surfaces of the fixed scroll 9b and the orbiting scroll 11b are in line contact with each other at a plurality of places. Are engaged with each other. In this state, the tip seals 13 of the fixed-side spiral body 9b and the rotating-side spiral body 11b are in close contact with the inner surfaces of the rotating-side end plate 11a and the fixed-side end plate 9a, respectively, as shown in FIG. Spiral body 9b and swirl-side spiral body 11
Compression chambers P, which are closed spaces, are formed at a plurality of locations having a point symmetrical positional relationship with respect to the center of b. The orbiting scroll 11 can revolve around the frame 3 and the fixed scroll 9 fixed to the frame 3 in a state where the rotation is prevented by a rotation preventing mechanism 12 having a well-known Oldham link 23. Are arranged.

The rotating shaft 6 of the motor 5 has an upper bearing 24 and a lower bearing 25 disposed on the inner peripheral surface of the frame 3.
An eccentric pin 26, which is pivotally supported by and is eccentric from the axis by a predetermined amount, is provided at the upper end in a protruding state. The eccentric pin 26 is inserted into the through hole 21a of the bush 21 and rotatably supports the bush 21. Further, a balance weight 28 is fixed below the eccentric pin 26 in a chamber 27 formed between the orbiting scroll 11 and the frame 3.

An oil passage 29 is formed in the eccentric pin 26 and the rotary shaft 6 so as to penetrate them vertically, and a lubricating oil pump 30 is provided at the lower end of the rotary shaft 6. It is connected to the. A lubricating oil 31 is stored in the bottom 2 b of the housing 2, and the lower end of the rotary shaft 6 is disposed in the lubricating oil 31. Further, the frame 3 has an oil drain hole 3b communicating the chamber 27 with the lower portion of the frame 3, and a passage 3c arranged on the outer peripheral portion of the frame 3 and communicating the upper portion and the lower portion of the frame 3.

Next, a method of compressing gas (fluid) in the scroll compressor 1 having the above configuration will be described. By driving the motor 5, the rotation of the rotary shaft 6 is transmitted to the orbiting scroll 11 via the eccentric pin 26, the bush 21, the orbiting bearing 22 and the boss 20, and the orbiting scroll 11 is rotated by the rotation preventing mechanism 12. In the stopped state, the fixed scroll 9 performs a revolving orbiting motion. At this time, the gas is supplied from the suction pipe 7 into the housing 2, cools the motor 5,
c, and is supplied to the compression chamber P via the suction passage 18 and the suction chamber 19.

The gas in the compression chamber P is conveyed to the central portion while being compressed as the volume of the compression chamber P is reduced by the orbital movement of the orbiting scroll 11. The gas thus further compressed is discharged into the discharge cavity 17 by pushing the discharge valve 15 through the discharge port 14 and discharged from the discharge cavity 17 to the outside by the discharge pipe 8.

The lubricating oil 31 stored in the bottom 2b
Is sucked up by the lubricating oil pump 30 and passes through the oil passage 29 and out of the tip of the eccentric pin 26. The eccentric pin 26, the bush 21, the slewing bearing 22, the thrust bearing 10, the lower bearing 25, the rotation preventing mechanism 12, etc. Lubricate. Thereafter, the lubricating oil 31 is returned from the chamber 27 to the bottom 2b of the housing 2 via the oil drain hole 3b and stored.

In the present invention, with respect to the scroll type compressor 1 having the above-described structure, the tip seal 13 on the fixed scroll 9 side is formed by a turning locus whose outer peripheral end is formed by the outer peripheral end of the end plate of the orbiting scroll 11. It is attached so that it is located outside. This will be described in detail based on the first embodiment shown in FIG.
The tip seal 13 attached to d is attached so that its outer peripheral end 13a is located outside the orbiting end plate 11a of the orbiting scroll 11, and is relatively close to the orbiting end plate 11a. . In other words, the outer peripheral end 13a of the tip seal 13 attached to the fixed scroll 9 is located outside and near the orbit of the orbit formed by the outer peripheral end of the orbiting end plate 11a that orbits relative to the fixed scroll 9. It is attached to be located at. The outer peripheral end 13a of the tip seal 13 is
It is near the outer end point of the spiral shape starting from the inner end near the discharge port 14.

With the above-described structure, even if the tip seal 13 on the fixed scroll 9 side is pushed in the direction of the contact surface of the orbiting end plate 11a by the compressed fluid, the orbiting side end plate 11a serving as the contact surface exists. The outer peripheral end 13a (indicated by the solid line in FIG. 1), which is not
Due to its rigidity, it hardly needs to be lifted. Therefore, it is possible to solve the problem that the outer peripheral end 13a of the tip seal 13 rises and bends during operation. Also, the outer peripheral end 13a of the tip seal 13
Is located on the inner side of the turning trajectory of the turning-side end plate 11a (see FIG. 10).
The sealable area can be extended by the extent that “a” extends to near the outside of the turning locus. Note that, depending on the design, the protrusion length L of the outer peripheral end plate 13a can be prevented from being bent if it is within the chip seal width H. As a result, the breakage of the tip seal 13 can be prevented and the sealing performance can be improved, so that the compression performance, durability and reliability of the scroll compressor can be improved.

Incidentally, in the above-described tip seal 13 on the fixed scroll 9 side, as the outer peripheral end portion 13a extends outward from the orbit, the sealable area is extended, which is advantageous in terms of improving the sealing performance. However, if the length is too long outside the turning locus, the outer end 13a
Bending breakage due to the lifting of the wire causes a problem. Therefore, in the present invention, as shown in FIG. 2, the end point Pe of the inner peripheral line IR forming the spiral shape of the tip seal 13 is at least centered on the turning trajectory line of the turning side end plate 11a. It is designed to be located within the range of the band-shaped area A defined by the width of about the width H. By doing so, the outer length of the turning locus may be shorter, and the inner peripheral line IR may be in close contact with the contact surface of the turning-side end plate 11a up to the end point P. Therefore, the free length L in which there is no contact surface is extremely short. In addition, since both side surfaces of the tip seal 13 along the inner peripheral line IR and the outer peripheral line OR are in close contact with the wall surface in the seal groove, the floating easily occurs in the direction of the axis C, and therefore, the free length L is short. Is advantageous for prevention of floating. Since the sealing function of the tip seal 13 is effective up to the end point P of the inner peripheral line IR, the sealable area can be made long. If the end point Pe of the inner circumferential line IR is located inside the turning locus (see FIG. 1), the free length L changes in a direction in which the free length L is further reduced or completely eliminated, so that the floating is prevented. This is advantageous in that it is somewhat disadvantageous in obtaining an effective seal length.

FIG. 3 shows a modification of the above-described first embodiment. In this case, the tip seal 13 has a curved surface portion whose outer peripheral end portion 13a is substantially similar to the turning locus of the turning side end plate 11a. 13b. That is, the curved surface portion 1
3b coincides or substantially coincides with a part of the similar shape S larger than the turning locus drawn by the turning side end plate 11a. By doing so, the seal maximum length L1 outside the turning locus is substantially constant and short, so that it is less likely to lift up. The end point Pe of the inner circumference IR is
It may be on a turning trajectory as shown, or
It may be in the band-shaped area A defined by the tip seal width H about the turning locus.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the tip seal 40 on the fixed scroll 9 side has an inclined portion 43 formed on the seal surface 42 of the outer peripheral end portion 41 so as to be naturally far from the contact surface on the other side. (A)
Is a side view showing the outer peripheral end 41 of the tip seal 40,
(B) is a sectional view of an essential part showing a state at the time of operation, (c) is a sectional view taken along line AA of (b), in which reference numeral 9b denotes a fixed-side spiral body, 9d denotes a tip surface, and 9e denotes a seal. The groove, 11a is a turning-side end face, and SP is a space.

The inclined portion 43 is provided in a region outside the turning locus of the turning-side end plate 11a, and receives a fluid pressure (see a white arrow) acting in the seal groove 9e on the back surface 44 and is indicated by an imaginary line. To be deformed. As a result, during the operation of the scroll compressor, the inclined portion 43 is deformed to form substantially the same plane as the seal surface 42, so that even if the scroll portion is provided outside the turning locus, it is bent and broken more than necessary. Can be prevented. That is, the outer peripheral end portion 41 of the tip seal 40 is formed into a shape in which deformation due to fluid pressure is predicted in advance, and it is possible to prevent the tip seal 40 from being bent and broken more than the seal surface 42 under the pressure. ing. Even with such a configuration, the breakage of the tip seal 40 can be prevented, and the sealing performance can be improved.

The present invention described above is applied to an open or horizontal scroll compressor and a scroll fluid machine in addition to the closed vertical scroll compressor described with reference to the drawings as an embodiment. It is possible.

[0028]

According to the scroll type fluid machine of the present invention described above, in the tip seal on the fixed scroll side,
Since bending breakage of the outer peripheral end portion can be prevented and the sealing performance can be improved with almost no increase in cost, there is a great effect on improving the compression performance, durability and reliability of the scroll type fluid machine. Further, the improvement in compression performance also contributes to the reduction in power consumption, which is advantageous in terms of energy saving.

[Brief description of the drawings]

FIG. 1 is a view showing one embodiment of a scroll type fluid machine according to the present invention, and is a view showing a main part of the first embodiment as viewed from an end plate side of an orbiting scroll.

FIG. 2 is an enlarged view of a main part showing a preferred embodiment in FIG.

FIG. 3 is an enlarged view of a main part showing a modification of the first embodiment.

FIG. 4 is a view showing a second embodiment of the present invention, in which (a)
Is a side view showing an outer peripheral end portion of the tip seal, (b) is a cross-sectional view of a main part showing a state of the tip seal shown in (a) during operation, and (c) is a cross-sectional view taken along line AA of (b). It is.

FIG. 5 is a cross-sectional view illustrating a configuration of a scroll compressor as an example of a scroll fluid machine.

FIG. 6 is an explanatory diagram showing a relationship between a fixed-side spiral body and a turning-side spiral body.

FIG. 7 is a plan view showing a fixed scroll viewed from a spiral body side as a conventional example.

FIG. 8 is a cross-sectional view of a main part showing a situation where a tip seal attached to a fixed scroll is in contact with an end plate on the orbiting scroll side.

FIG. 9 is a view showing, as a conventional example, an outer peripheral end of a tip seal attached to a fixed scroll as viewed from an end plate on the orbiting scroll side.

FIG. 10 is a diagram showing another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Scroll type compressor 2 Housing 3 Frame 4 Scroll type compression mechanism 5 Motor (drive means) 6 Rotary shaft 7 Suction pipe 8 Discharge pipe 9 Fixed scroll 9a Fixed end plate 9b Fixed spiral body 9d Tip surface 9e Seal groove 11 Rotation Scroll 11a Revolving side end plate 11b Revolving side spiral body 12 Rotation preventing mechanism 13, 40 Chip seal 13a, 41 Outer peripheral side end 42 Seal surface 43 Inclined portion 44 Back surface

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H039 AA03 AA04 AA12 BB05 BB15 CC02 CC03 CC05 CC31

Claims (4)

[Claims] A housing which forms a closed space and connects the suction pipe and the discharge pipe, a fixed scroll fixedly supported in the housing, and meshed with the fixed scroll;
A rotating scroll that revolves around the fixed scroll to prevent revolving motion and a revolving scroll that is fitted on the distal end surfaces of spiral bodies protruding from end plates of the fixed scroll and the revolving scroll; A tip seal that is in close contact with the surface and seals between the low-pressure side and the high-pressure side; and a drive unit for the orbiting scroll. The fixed scroll and the orbiting scroll come into contact with each other at a plurality of contact points to form a crescent shape. The compression chamber moves inward while reducing the volume from the outer peripheral side to simultaneously perform suction, compression and discharge, and the outer diameter of the end plate of the fixed scroll is smaller than the outer diameter of the end plate of the orbiting scroll. A scroll type fluid machine having a diameter larger than a diameter, wherein an outer peripheral end of the tip seal on the fixed scroll side is formed by an outer peripheral end of an end plate of the orbiting scroll. A scroll-type fluid machine mounted so as to be located near the outside of a turning locus. 2. An outer peripheral end of the tip seal,
The scroll type fluid machine according to claim 1, wherein at least a spiral inner peripheral line is on or near the orbit. 3. An end portion on an outer peripheral side of the tip seal has a curved surface portion substantially similar to a revolving locus formed by an outer peripheral end of an end plate of the orbiting scroll. The scroll-type fluid machine according to claim 1. 4. A housing which forms a space and connects the suction pipe and the discharge pipe, a fixed scroll fixed and supported in the housing, meshes with the fixed scroll, and is prevented from rotating with respect to the fixed scroll and revolves. A orbiting scroll that performs orbiting motion, and a low-pressure side and a high-pressure side which are fitted to the tip end surfaces of spiral bodies protruding from end plates of the fixed scroll and the orbiting scroll, respectively, and are in close contact with the contact surface of the counterpart scroll. The fixed scroll and the orbiting scroll are in contact at a plurality of contact points to form a crescent-shaped compression chamber, and the compression chamber is A scroll-type fluid machine that moves inward while reducing the volume from the outer peripheral side and simultaneously performs suction, compression, and discharge, wherein the fixed scroll-side tip Le A scroll type fluid machine characterized in that it comprises an inclined portion that is shaped to receding from the counterpart contact surface in a natural state the sealing surface of the outer peripheral side end portion.