JP2022058628A - Scroll type fluid machine and seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal which can effectively prevent inflow of an external fluid, and to provide a seal member.

SOLUTION: A scroll type fluid machine 10 includes: a first scroll 20 and a second scroll 30 which can move relative to each other and face each other; and an annular dust-proof seal member 50 which is disposed between the first scroll and the second scroll while contacting with the scrolls. The annular dust-proof seal member 50 includes a cutting part, and two portions forming the cutting part overlap with each other in a width direction. The two portions may move relative to each other while overlapping with each other in the width direction.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2022,JPO&INPIT

Description

The present invention relates to a scroll type fluid machine having excellent durability. The present invention also relates to a seal member and a seal.

For example, as disclosed in JP7-208353A, a scroll type fluid machine having a fixed scroll and a movable scroll that swings relative to the fixed scroll is known. In this scroll type fluid machine, a working chamber is defined between the fixed scroll and the movable scroll. The fixed scroll and the movable scroll each have a spiral wrap that projects toward the working chamber. In addition, an inlet and an outlet for communicating the action chamber to the outside are provided. When the movable scroll is movable relative to the fixed scroll, the fluid is compressed along the spiral flow path defined by the spiral wrap. As a result, in the example shown in JP7-208353A, the fluid is sucked from the inlet located at the outer peripheral portion, and the compressed fluid is discharged from the outlet located at the central portion.

In the scroll type fluid machine disclosed in JP7-208353A, a negative pressure is generated in the working chamber during operation. The scroll type fluid machine is provided with a dustproof seal in order to prevent outside air from flowing into the working chamber from between the fixed scroll and the movable scroll. The linear dustproof seal is arranged so that both ends thereof overlap in the radial direction and surrounds the working chamber. The dustproof seal arranged in this way seals between the fixed scroll and the movable scroll.

However, when the conventional scroll type fluid machine is used in a harsh environment with a lot of dust and the like, there is a problem that the tip sealing material provided at the tip of the spiral wrap has an extremely short life. After investigating the cause of this problem, in a conventional scroll-type fluid machine, a leak occurs at the abutment formed by overlapping both ends of the dustproof seal member in the radial direction, and dust and the like flow into the working chamber. It was estimated that there was. More specifically, the air passes between both ends of the dustproof seal member at the abutment and flows into the working chamber, and the dust flowing into the working chamber together with the air deteriorates the tip tip by friction. Was expected. The present invention is based on the findings of the present inventors, and effectively suppresses deterioration of the tip sealing material by effectively preventing the inflow of external fluid into the scroll type fluid machine. The purpose is. Another object of the present invention is to provide a seal and a seal member that can effectively prevent the inflow of an external fluid.

In addition, JP7-208353A proposes the adoption of a seamless, endless annular dustproof seal member. However, in the non-lubricated scroll type fluid machine, the temperature rises during operation. As a result, the dust-proof seal member causes meandering or twisting due to thermal deformation between the fixed scroll and the movable scroll, and a leak due to such deformation occurs. That is, the conventional scroll type fluid machine has not been able to sufficiently deal with the problem.

The scroll type fluid machine according to the present invention is, as a broadest concept, relatively movable, and is in contact with each other between the first scroll and the second scroll facing each other and the first scroll and the second scroll, respectively. It is provided with an annular dust-proof seal member arranged in a row. The scrolling fluid machine may then include one or more of the features described below.

The first scroll type fluid machine according to the present invention is
The first scroll and the second scroll, which are relatively movable and face each other,
An annular dust-proof seal member that is arranged in contact with each other between the first scroll and the second scroll, has a cut portion, and two portions forming the cut portion overlap in the width direction thereof. Equipped with
The width of the dust-proof seal member at the overlapping portion of the two portions is equal to or less than the width of the other portions of the dust-proof sealing member, and the two portions overlap in the width direction. And it is possible to move relative to each other.

In the first scroll type fluid machine according to the present invention,
The dustproof seal member includes, as the two portions, an inner portion and an outer portion of the inner portion located outside in the width direction.
The outer side surface of the inner portion, which faces the outer side, is inclined and tapered with respect to the outer side surface at a portion adjacent to the inner portion of the dustproof seal member.
The outer side surface is tapered so that the inner side surface facing the inside thereof is inclined with respect to the inner side surface in the portion adjacent to the outer side portion of the dustproof seal member.
The outer side surface of the inner portion may be in contact with the inner side surface of the outer portion.

In the first scroll type fluid machine according to the present invention,
One of the two portions has a concave portion formed by the annular dust-proof seal member in the circumferential direction.
The other of the two portions may have a convex portion that protrudes in the circumferential direction and is inserted into the concave portion.

In the first scroll type fluid machine according to the present invention,
The dustproof seal member includes, as the two portions, an inner portion and an outer portion of the inner portion located outside in the width direction.
The inner portion is located at a base portion narrower than the width of a portion adjacent to the inner portion of the dustproof seal member and a tip side of the base portion along the longitudinal direction of the dustproof seal member. It has a widened part that is wider than the part,
The outer portion is located at the base portion narrower than the width of the portion adjacent to the outer portion of the dustproof seal member and the tip side of the base portion along the longitudinal direction of the dustproof seal member. It has a widened part that is wider than the part,
The widened portion of the inner portion faces the base portion of the outer portion in the width direction.
The widened portion of the outer portion may face the base portion of the inner portion in the width direction.

The first scroll-type fluid machine according to the present invention may further include a pressing means for pressing one of the two portions toward the other.

In the first scroll type fluid machine according to the present invention, the pressing means may press the one toward the other along the width direction.

In the first scroll type fluid machine according to the present invention, the pressing means may include an elastic member.

In the first scroll type fluid machine according to the present invention, the pressing means may include a fluid ejection mechanism.

In the first scroll type fluid machine according to the present invention, a circumferential groove is formed in one of the first scroll and the second scroll, the dustproof seal member is arranged in the groove, and the fluid ejection mechanism is , The fluid may be ejected into the groove.

In the first scroll type fluid machine according to the present invention,
A circumferential groove is formed in one of the first scroll and the second scroll, and the dustproof seal member is arranged in the groove.
The dustproof seal member includes, as the two portions, an inner portion and an outer portion of the inner portion located outside in the width direction.
The dustproof seal member includes at least one of an inner extending piece projecting inward from the inner side surface facing the inside of the inner portion and an outer extending piece projecting outward from the outer side surface facing the outside of the outer portion. One may be provided.

In the first scroll type fluid machine according to the present invention, the inner extension piece may be tapered inward and the outer extension piece may be tapered outward.

In the first scroll type fluid machine according to the present invention,
The inner extension piece includes a front end side surface and a base end side surface facing the dustproof seal member in the longitudinal direction.
In the observation from the direction in which the first scroll and the second scroll face each other, the angle formed by the front end side surface located on the tip end side in the longitudinal direction of the dustproof seal member with respect to the longitudinal direction is the base end side surface. Smaller than the angle made with respect to the longitudinal direction,
The outer extension piece includes a distal end side surface and a proximal end side surface facing the dustproof seal member in the longitudinal direction.
In the observation from the direction in which the first scroll and the second scroll face each other, the angle formed by the front end side surface located on the tip end side in the longitudinal direction of the dustproof seal member with respect to the longitudinal direction is the base end side surface. It may be smaller than the angle formed in the longitudinal direction.

In the first scroll type fluid machine according to the present invention,
A circumferential groove is formed in one of the first scroll and the second scroll, and the dustproof seal member is arranged in the groove.
A paste-like material may be filled in the groove at least between the two portions of the dustproof sealing member.

The first scroll type fluid machine according to the present invention may further include a second dustproof sealing member provided inside or outside the dustproof sealing member.

The second scroll type fluid machine according to the present invention is
The first scroll and the second scroll, which are relatively movable and face each other,
An unsupported annular metal first seal located on one of the first scroll and the second scroll,
It is provided on the first seal portion and includes a second seal portion made of resin or rubber, which is a non-carrying ring and is in contact with the other of the first scroll and the second scroll.

In the second scroll type fluid machine according to the present invention, a circumferential groove is formed in one of the first scroll and the second scroll, and the first seal portion and the second seal portion are in the same groove. In addition, the first scroll and the second scroll may be arranged so as to be overlapped with each other in the opposite directions.

In the second scroll type fluid machine according to the present invention, the second seal portion may be a fluorine-based resin layer formed on the first seal portion.

In the second scroll type fluid machine according to the present invention, the width of the first seal portion in the direction in which the first scroll and the second scroll face each other may be wider than the width of the second seal portion. ..

In the second scroll type fluid machine according to the present invention, the surface in contact with the first seal portion and the second seal portion is inclined with respect to the width direction in the direction in which the first scroll and the second scroll face each other. You may be.

The third scroll type fluid machine according to the present invention is
The first scroll and the second scroll, which are relatively movable and face each other,
It is provided with an annular dustproof seal that is overlapped at one or more places in a state of being in contact with each other in the width direction so as to be in contact with the first scroll and the second scroll.
The length of the narrowest portion of the dustproof seal is shorter than the rest of the dustproof seal.

In the third scroll type fluid machine according to the present invention,
A single dustproof seal member is provided in the narrowest portion.
Two or more of the narrowest portions may be provided apart from each other in the circumferential direction of the dustproof seal.

In the third scroll type fluid machine according to the present invention, one of the narrowest portions is provided in a region including one of two positions most separated along the circumferential direction of the dustproof seal, and the widest portion is provided. The other one of the narrow portions may be provided in the region including the other of the two positions.

The fourth scroll type fluid machine according to the present invention is
The first scroll and the second scroll, which are relatively movable and face each other,
An annular dustproof seal arranged in contact with each other between the first scroll and the second scroll is provided.
The annular dustproof seal includes a region in which two or more portions thereof are arranged so as to overlap in the width direction.
The length of the region where the two or more portions of the dustproof seal overlap is longer than the length of the other region.

In the fourth scroll type fluid machine according to the present invention, two or more regions where the two or more portions overlap may be provided apart from each other in the longitudinal direction of the dustproof seal.

In the fourth scroll type fluid machine according to the present invention, one of the two or more overlapping regions is provided in a region including one of the two most distant positions along the circumferential direction of the dustproof seal. The other one of the areas where the two or more portions overlap may be provided in the area including the other of the two positions.

The fifth scroll type fluid machine according to the present invention is
The first scroll and the second scroll, which are relatively movable and face each other,
An annular dust-proof seal member that is arranged in contact with each other between the first scroll and the second scroll, has a cut portion, and two portions forming the cut portion overlap in the width direction thereof.
A pressing means for pressing one of the two portions toward the other is provided.

The sixth scroll type fluid machine according to the present invention is
The first scroll and the second scroll, which are relatively movable and face each other,
An annular dust-proof seal member that is arranged in contact with each other between the first scroll and the second scroll, has a cut portion, and two portions forming the cut portion overlap in the width direction thereof. Equipped with
A circumferential groove is formed in one of the first scroll and the second scroll, and the dustproof seal member is arranged in the groove.
A paste-like material is filled in the groove at least between the two portions of the dustproof sealing member.

The seventh scroll type fluid machine according to the present invention is
The first scroll and the second scroll, which are relatively movable and face each other,
An annular dust-proof seal member that is arranged in contact with each other between the first scroll and the second scroll, has a cut portion, and two portions forming the cut portion overlap in the width direction thereof. Equipped with
A circumferential groove is formed in one of the first scroll and the second scroll, and the dustproof seal member is arranged in the groove.
The dustproof seal member includes, as the two portions, an inner portion and an outer portion of the inner portion located outside in the width direction.
The dustproof seal member includes at least one of an inner extending piece projecting inward from the inner side surface facing the inside of the inner portion and an outer extending piece projecting outward from the outer side surface facing the outside of the outer portion. One is provided.

The first sealing member according to the present invention is
An annular sealing member that is relatively movable and comes into contact with each other between the first and second parts facing each other.
The two portions having the cut portion and forming the cut portion are in contact with each other in the width direction and overlap each other.
The width of the dust-proof seal member at the cut portion is equal to or less than the width of the other portion of the dust-proof seal member, and the two portions forming the cut portion can be relatively moved in an overlapping state. ..

The second sealing member according to the present invention is
An annular sealing member that is relatively movable and comes into contact with each other between the first and second parts facing each other.
It is a non-carrying ring and has a metal ring body.

The first seal according to the present invention is
An annular sealing member that is relatively movable and is arranged in a circumferential groove formed in one of the first and second parts facing each other and is arranged in contact with the other. hand,
The inner part and
An outer portion that overlaps the inner portion from the outside in the width direction and forms a cut portion between the inner portion and the inner portion.
It comprises at least one of an inner extending piece protruding inward from an inner portion facing the inside of the inner portion and an outer extending piece protruding outward from an outer side surface facing the outside of the outer portion.

The second seal according to the present invention is
An annular seal that is movable relative to each other and is placed between the first and second parts facing each other.
A non-bearing annular, metal first seal portion that is to be placed on one of the first component and the second component.
It is provided with a second seal portion made of resin or rubber, which is an unsupported annular shape and is provided on the first seal portion and comes into contact with the other of the first component and the second component.

The third seal according to the present invention is
Between the first and second parts, which are relative movable and face each other, the seals overlap in one or more places in contact with each other in the width direction.
The length of the narrowest portion of the front seal is shorter than the rest of the seal.

The fourth seal according to the present invention is
An annular seal that is movable relative to each other and is placed in contact with each other between the first and second parts facing each other.
Includes areas where the two or more parts overlap in the width direction.
The length of the region where the two or more portions overlap is longer than the length of the other region.

According to the present invention, it is possible to effectively prevent the inflow of external fluid into the inside of the scroll type fluid machine.

FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a vertical sectional view showing a scroll type fluid machine. FIG. 2 is an exploded perspective view showing a fixed scroll, a dustproof seal member, and an urging means included in the scroll type fluid machine shown in FIG. FIG. 3 is a partially enlarged view of FIG. FIG. 4 is a diagram for explaining a first example of the dustproof seal structure, and is a plan view showing the vicinity of the end portion of the dustproof seal member. FIG. 5 is a diagram for explaining a second example of the dustproof seal structure, and is a plan view showing the vicinity of the end portion of the dustproof seal member. FIG. 6 is a diagram for explaining a third example of the dustproof seal structure, and is a plan view showing the vicinity of the end portion of the dustproof seal member. FIG. 7 is a diagram for explaining a fourth example of the dustproof seal structure, and is a plan view showing the vicinity of the end portion of the dustproof seal member. FIG. 8 is a cross-sectional view taken along the line VIII-VIII of FIG. FIG. 9 is a cross-sectional view corresponding to FIG. 8 and is a diagram for explaining a modified example of the fourth example. FIG. 10 is a diagram for explaining a fifth example of the dustproof seal structure, and is a plan view showing the vicinity of the end portion of the dustproof seal member. 11 is an enlarged view of FIG. 10. FIG. 12 is a diagram for explaining a sixth example of the dustproof seal structure, and is a plan view showing the vicinity of the end portion of the dustproof seal member. FIG. 13 is a diagram for explaining a seventh example of the dustproof seal structure, and is a plan view showing the dustproof seal member. FIG. 14 is a cross-sectional view taken along the line XIV-XIV of FIG. FIG. 15 is a diagram for explaining an eighth example of the dustproof seal structure, and is a plan view showing the dustproof seal member. FIG. 16 is a cross-sectional view taken along the line XVI-XVI of FIG. FIG. 17 is a diagram for explaining a modification of the eighth example with the same cross section as that of FIG. FIG. 18 is a diagram for explaining another modification of the eighth example with the same cross section as that of FIG. FIG. 19 is a diagram for explaining a ninth example of the dustproof seal structure, and is a plan view showing the dustproof seal member. FIG. 20 is a cross-sectional view taken along the line XX-XX of FIG. FIG. 21 is a diagram for explaining a tenth example of a dustproof seal structure, and is a plan view showing a dustproof seal member. FIG. 22 is a diagram for explaining a modification of the tenth example of the dustproof seal structure, and is a plan view showing the dustproof seal member.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the drawings attached to the present specification, the scale and the aspect ratios are appropriately changed and exaggerated from those of the actual product for the convenience of illustration and comprehension.

1 to 22 are diagrams for explaining one embodiment according to the present invention. Of these, FIGS. 1 to 3 are diagrams for explaining the overall configuration of the scroll type fluid machine. 4 to 22 are views for explaining some examples of the dustproof seal structure.

As shown in FIG. 1, the scroll type fluid machine 10 includes a case 15, a first scroll 20, a second scroll 30, and a drive mechanism 40 as main configurations. In the illustrated example, the first scroll is configured as a fixed scroll 20 and is fixed to the case 15 via fasteners 13. The second scroll is configured as a movable scroll 30 and is arranged in the space formed by the case 15 and the fixed scroll 20. However, the present invention is not limited to this example, and the first scroll may be configured as a movable scroll 30 and the second scroll may be configured as a fixed scroll 20.

The movable scroll 30 faces the fixed scroll 20 in the axial direction ad defined by the drive mechanism 40. An action chamber 11 is formed between the fixed scroll 20 and the movable scroll 30. In the scroll type fluid machine 10, the movable scroll 30 can act on the fluid in the working chamber 11 by moving relative to the fixed scroll 20. Between the fixed scroll 20 and the movable scroll 30, a seal (seal component) S is arranged and a seal structure is provided in order to seal the space between the fixed scroll 20 and the movable scroll 30 to partition the action chamber 11 from the outside. ing.

In one embodiment described below, a device for effectively preventing a leak in the seal structure, in other words, a device for improving the airtightness of the seal structure is made. According to the scroll type fluid machine 10, it is possible to effectively prevent dust from flowing into the working chamber 11 together with the fluid as well as the fluid. As a result, deterioration of the configuration in the working chamber 11 can be effectively suppressed, the frequency of inspection and maintenance of the scroll type fluid machine 10 can be reduced even when used in a poor environment with a lot of dust and the like, and further. Makes it possible to extend the life of the scroll type fluid machine 10. In particular, such an action effect is particularly useful for a non-lubricated scroll type fluid machine that is not supposed to be disassembled and maintained for a long period of time.

The seal structure provided with the seal (seal component) S described below is not limited to the scroll type fluid machine, and includes various first and second components that are relatively movable and face each other. Suitable for equipment or devices. For example, the relative movement of the first component and the second component can be various operations, and as an example, it may be a turning operation, a translation operation, or a reciprocating operation. good. Further, the seal structure provided with the seal S can be used not only for dustproof use but also for liquidproof use against oil and water.

First, the overall configuration of the scroll type fluid machine 10 other than the dustproof seal structure will be described, and then some examples of the seal structure including the seal S will be described.

As shown in FIGS. 1 and 2, the fixed scroll 20 has a base plate portion 21 having a substantially disk-shaped outer shape. An annular wall portion 22 is provided on the peripheral edge of the base plate portion 21. The annular wall portion 22 extends from the base plate portion 21 toward the movable scroll 30 in the axial direction a of the scroll type fluid machine 10. The annular wall portion 22 of the fixed scroll 20 is fixed to the case 15 by using the fastener 13. As shown in FIG. 2, a circumferential (particularly circumferential) groove 25 is formed in the annular wall portion 22. The urging means 48 and the sealing member 50, which will be described later, are arranged in the groove 25.

As shown in FIGS. 1 and 2, the fixed wrap 23 is provided in the region surrounded by the annular wall portion 22 of the base plate portion 21. The fixed lap 23 is a wall portion erected along a spiral path when observed from the axial direction a of the scroll type fluid machine 10. The fixed lap 23 extends from the base plate portion 21 toward the movable scroll 30 in the axial direction a of the scroll type fluid machine 10. A tip sealing material 23a is provided at the tip of the fixed wrap 23. The tip sealing material 23a comes into contact with the movable scroll 30. The tip sealing material 23a seals between the fixed wrap 23 and the movable scroll 30.

As shown in FIG. 1, the base plate portion 21 is provided with a through hole. The through hole forms an inlet 11a and an outlet 11b that allow the working chamber 11 to communicate with the outside. In the illustrated example, the inlet 11a is formed in the outer peripheral portion along the spiral path of the fixed wrap 23, and the outlet 11b is formed in the central portion along the spiral path of the fixed wrap 23. Further, as shown in FIG. 1, a heat radiation fin 24 is provided on the side of the base plate portion 21 opposite to the side on which the fixed wrap 23 is provided.

The movable scroll 30 has a base plate portion 31 arranged to face the base plate portion 21 of the fixed scroll 20. A movable lap 33 is formed on the side of the base plate portion 31 facing the fixed scroll 20. The movable lap 33 is a wall portion erected along a spiral path when observed from the axial direction ad of the scroll type fluid machine 10, and has a configuration complementary to the fixed lap 23. The movable lap 33 extends from the base plate portion 31 toward the fixed scroll 20 in the axial direction a of the scroll type fluid machine 10. A tip sealing material 33a is provided at the tip of the movable wrap 33. The tip sealing material 33a comes into contact with the fixed scroll 20. The tip sealing material 33a seals between the movable wrap 33 and the fixed scroll 20. As shown in FIG. 1, a heat radiation fin 34 and a connecting boss 35 are provided on the side of the base plate portion 31 opposite to the side on which the movable lap 33 is provided.

The drive mechanism 40 is a mechanism that causes the movable scroll 30 to operate relative to the fixed scroll 20. In the present embodiment, the drive mechanism 40 swings the movable scroll 30 relative to the fixed scroll 20 in a plane orthogonal to the axial direction a of the scroll type fluid machine 10. The movable scroll 30 is driven by the drive mechanism 40 and moves in translation with respect to the fixed scroll 20, especially along the circumferential path.

The drive mechanism 40 has an electric motor 41 that outputs a rotational force, and a conversion mechanism for converting a rotational movement output from the electric motor 41 into a translational motion along a circumferential trajectory. As the conversion mechanism, various known configurations, for example, the configurations disclosed in the above-mentioned patent document (JP7-208353A) and the like can be adopted. In the example shown in FIG. 1, the conversion mechanism 42 has a crank shaft 43 that is rotationally driven by the electric motor 41, and a bearing 44 that is fixed in the connecting boss 35 of the movable scroll 30. The crank shaft 43 includes a first shaft portion 43a arranged on the rotation axis ra of the motor 41 and rotationally driven by the motor 41, and a second shaft portion 43b defining an eccentric axis ea eccentric from the rotation axis ra. Have. The second shaft portion 43b is held by the bearing 44. When the first axis portion 43a is rotationally driven, the second axis portion 43b moves on a circumferential orbit centered on the rotation axis ra, and the radius of the circumferential orbit is from the rotation axis ra to the eccentric axis ea. Matches the amount of eccentricity. At this time, the movable scroll 30 can rotate about the eccentric axis ea with respect to the second shaft portion 43b via the bearing 44. With such a configuration, the movable scroll 30 can swing with respect to the fixed scroll 20 by the rotation output from the electric motor 41. Although not shown, a mechanism for restricting the rotation of the movable scroll 30 with respect to the fixed scroll 20, such as a crank shaft, may be separately provided.

The axis direction a of the scroll type fluid machine 10 is defined by the rotation axis ra of the electric motor 41. The axial direction a of the scroll type fluid machine 10 is a direction parallel to the rotation axis ra of the motor 41, and in the illustrated example, the direction is also parallel to the eccentric axis ea. The fixed scroll 20 and the movable scroll 30 face the axial direction ad of the scroll type fluid machine 10.

Among the above-mentioned components, the case 15, the fixed scroll 20, and the movable scroll 30 are made of a metal having high strength and excellent heat resistance. Among metals, aluminum alloy has advantages such as light weight and excellent heat dissipation.

In the scroll type fluid machine 10 having the above configuration, when the movable scroll 30 swings and rotates with respect to the fixed scroll 20 by the drive mechanism 40, the fixed lap 23 and the movable lap 33 change to the fixed lap 23 in the working chamber 11. It repeats approaching and separating in each region along the spiral path of. As a result, in the working chamber 11, the fluid as an internal medium is compressed or expanded along the spiral path of the fixed wrap 23. In the illustrated example, the air is compressed from the outer peripheral portion along the spiral path of the fixed wrap 23 toward the central portion. At the center of the fixed lap 23 along the spiral path, pressured air is obtained and supplied to the outside through the outlet 11b. Along with this, air is sucked from the inlet 11a located at the outer peripheral portion along the spiral path of the fixed wrap 23. That is, in the illustrated example, the scroll type fluid machine 10 functions as a compressor.

In order to deal with heat generation due to air compression and heat generation due to friction in the action chamber 11 between the movable scroll 30 and the fixed scroll 20 during the operation of the scroll type fluid machine 10, the fixed scroll 20 and the movable scroll 30 are used. It has heat dissipation fins 24 and 34. Then, a cooling medium is supplied to the heat radiation fins 24 and 34 by a cooling device (not shown), and heat exchange is performed with the heat radiation fins 24 and 34. As an example, the cooling device is configured as a blower and blows air onto the radiating fins 24, 34.

By the way, the scroll type fluid machine functioning as a compressor is used in various fields, such as a train vehicle and a vehicle such as an automatic person. However, when a conventional scroll-type fluid machine is used in a harsh environment with a lot of dust, there is a problem that the tip sealing material (also called a tip seal) provided at the tip of the wrap has an extremely short life. .. The scroll type fluid machine is a non-lubricated type, and it has been regarded as a great advantage that maintenance does not have to be carried out for a certain period of time. Therefore, deterioration of the tip sealing material in use in a harsh environment is a serious defect for the scroll type fluid machine and is a reason for hindering the spread of the scroll type fluid machine. In order to deal with such a problem, the scroll type fluid machine 10 of the present embodiment has a dustproof seal structure using a seal (seal component) S described below.

In the following description, the first aspect of the seal structure will be described with reference mainly to the first to sixth examples, and the second aspect of the seal structure will be described with reference mainly to the seventh and eighth examples. A third aspect of the seal structure will be described with reference mainly to the ninth and tenth examples. In the following example, the seal member 50 forming the seal S exhibits a dustproof function as a dustproof seal member when applied to the scroll type fluid machine 10.

<< First aspect >>
First, the first aspect of the seal structure will be described. The seal S used in the first aspect is one or more annular seal members that are relative movable and are arranged in contact with each other between the first component 20 and the second component 30 facing each other. Contains 50. The dust-proof seal member 50 has a cut portion CU, and two portions 51 and 52 forming the cut portion CU overlap each other in the width direction of the dust-proof seal member 50. The dustproof seal member 50 may be configured as a member having an elongated longitudinal direction extending linearly.

The width direction of the seal S or the seal member 50 is a direction orthogonal to both the axial direction a and the longitudinal direction of the dustproof seal member 50, and in the example described below, it corresponds to the radial direction rd described later. Therefore, in the following description, the same reference numeral "rd" as in the radial direction with respect to the width direction is used.

The cut portion CU of the dustproof seal member 50 is not limited to the portion formed by cutting a continuous member. The cut portion CU is not limited to the forming method, and the cut located between the two unintegrated portions 51 and 52 also corresponds to the cut portion CU.

Then, in the first aspect, the two portions 51 and 52 forming the cut portion CU, in other words, the two portions 51 and 52 defining the cut portion CU, and further in other words, the two portions located on both sides of the cut portion CU. 51 and 52 are relatively movable in a state of being overlapped in the width direction. Therefore, as will be described later, when the total length of the dustproof seal member 50 becomes long due to thermal expansion, the two portions 51 and 52 can move in the longitudinal direction thereof. At this time, by maintaining the state in which the two portions 51 and 52 overlap each other in the width direction, the sealing function at the cut portion CU can be maintained and leakage at the cut portion CU can be effectively prevented. As a result, it is possible to effectively prevent the inflow of dust into the working chamber 11, and it is possible to effectively avoid unplanned early deterioration of the tip sealing materials 23a and 33a of the fixed lap 23 and the movable lap 33. can.

It is preferable that the two portions 51 and 52 forming the cut portion CU are relatively movable as long as they are maintained to overlap with each other in the width direction rd. That is, it is preferable that the two portions 51 and 52 forming the cut portion CU are maintained in a state of overlapping in the width direction rd without depending on their relative movement. In this case, leakage at the cut portion CU can be stably and effectively prevented. When the relative movement of the two portions 51 and 52 forming the cut portion CU is caused by the thermal expansion of the seal member 50, the seal member of the seal member 50, for example, before the temperature rise of the seal member 50, for example, the scroll type fluid machine 10. Even before the operation of the device or device including the 50, the length of the seal member 50 may be set so that the two portions 51 and 52 forming the cut portion CU overlap in the width direction rd. Further, in the example shown in FIG. 6 to be referred to later, structurally, the two portions 51 and 52 forming the cut portion CU are relatively movable as long as they are maintained to overlap with each other in the width direction rd. There is.

In addition, in the first aspect, the width of the seal member 50 at the cut portion CU is equal to or smaller than the width of the other portion of the dustproof seal member 50. That is, in the region where the cut portion CU is provided, in the dustproof seal member 50, the two portions 51 and 52 overlap each other in the width direction rd, but the width thereof does not increase. Therefore, the installation of the seal member 50, for example, the installation of the seal member 50 in the groove 25 as described later can be easily and accurately performed. Further, the width of the circumferential groove 25 can be made constant. As a result, the sealing function of the seal S can be further improved.

Hereinafter, the first aspect of the seal structure will be described with reference to some specific examples.

In the following specific example, the seal S has a single seal member 50, but the seal S may include a plurality of seal members 50 as in the tenth example described later. By including the plurality of dustproof seal members 50, in particular, by changing the position of the cut portion CU in the circumferential direction cd and installing the plurality of dustproof seal members 50, the airtightness can be remarkably improved.

Further, a joint portion 55 is formed between both end portions 51 and 52 of the linear dustproof seal member 50. Then, in these examples, a cut portion CU is formed at the abutment portion 55. That is, in the following example, the portions forming the cut portion CU are the end portion 51 and the end portion 52 of the dustproof seal member 50. However, the following specific configuration is merely an example, and various changes can be made.

<First example>
First, a first example of the dustproof seal structure will be described. As described in the description of the overall configuration of the scroll type fluid machine 10, the fixed scroll 20 is formed with a groove 25 (see FIG. 2). The groove 25 is arranged so as to surround the action chamber 11. Further, the groove 25 is provided in a region always facing the peripheral edge portion of the movable scroll 30, regardless of the relative position of the movable scroll 30 with respect to the fixed scroll 20. However, the present invention is not limited to such an example, and the groove 25 may be provided in the movable scroll 30. Further, in the illustrated example, the groove 25 has a constant width in the radial direction. However, the present invention is not limited to this example, and the width of the groove 25 may vary.

By setting the groove 25 to a constant width, it is possible to facilitate the creation of the groove. In addition, as will be described later, it is possible to facilitate the arrangement of the seal member 50 having the cut portion CU in the groove 25.

In the present specification, the direction along the circumferential locus surrounding the action chamber 11 is referred to as the circumferential direction cd. Further, the direction orthogonal to both the axial direction ad and the circumferential direction cd is referred to as a radial direction rd. In the illustrated example, the longitudinal direction of the dustproof seal member 50 incorporating the scroll type fluid machine 10 corresponds to the circumferential direction cd, and the width direction of the dustproof seal member 50 corresponds to the radial direction rd. Further, the "inner" side in the width direction rd and the radial direction rd is the inside of the circumference defined by the circumferential direction cd, and is the side close to the rotation axis ra in the scroll type fluid machine 10. The "outer" side in the width direction rd and the radial direction rd is the side outside the circumference defined by the circumferential direction cd and far from the rotation axis ra of the scroll type fluid machine 10.

As shown in FIGS. 2 and 3, the groove 25 is provided with the urging means 48 and the dustproof seal member 50. The urging means 48 presses the dustproof seal member 50 in the axial direction a and urges the fixed scroll 20 to abut the movable scroll 30. The urging means 48 may be configured by an elastic member. In the illustrated example, the urging means 48 is formed of an annular rubber. However, the present invention is not limited to this example, and the urging means 48 may be dispersedly arranged in the circumferential direction cd. As shown in FIG. 3, the fixed scroll 20 and the movable scroll 30 are sealed in the axial direction by the urging means 48 and the dustproof seal member 50.

The dustproof seal member 50 is a member that comes into contact with the movable scroll 30 and fills the gap between the fixed scroll 20 and the movable scroll 30. Therefore, a material having abrasion resistance and sealing property, for example, rubber or resin can be selected as the material of the dustproof sealing member 50.

In the first example of the dust-proof seal structure shown in FIGS. 2 to 4, the airtightness of the dust-proof seal structure is improved by the shape of the dust-proof seal member 50. First, as shown in FIG. 2, the dustproof seal member 50 is configured as a linear member. Then, as shown in FIG. 4, the dustproof seal member 50 overlaps in the radial direction (width direction of the dustproof seal member 50) rd in which both end portions 51 and 52 are orthogonal to the circumferential direction (longitudinal direction of the dustproof seal member 50) cd. A cut portion CU is formed between both end portions 51 and 52. However, both end portions 51 and 52 overlap each other in the width direction rd, and the abutment portion 55 is formed by this overlap. Then, the dustproof seal member 50 surrounds the working chamber 11 from the entire circumference thereof. The dustproof seal member 50 takes in the action chamber 11 and seals between the fixed scroll 20 and the movable scroll 30. In addition, in FIG. 4 and FIGS. 5 to 22 described later, the working chamber 11 and the fixed wrap 23 are not shown.

As shown in FIG. 4, in particular, in the first example, the linear dustproof seal member 50 has an inner end portion (inner portion) relatively located inside in the width direction rd as both end portions forming the abutment portion 55. It has a 51 and an outer end portion (outer portion) 52 located relatively outside in the width direction rd. That is, the outer end portion 52 is located on the outer side in the radial rd of the inner end portion 51. Further, the dustproof seal member 50 further has an intermediate portion 53 located between the inner end portion 51 and the outer end portion 52. In the illustrated example, the intermediate portion 53 has a constant width. On the other hand, both the inner end 51 and the outer end 52 are tapered. The size of the width in the width direction rd at the portion where both end portions 51 and 52 of the dustproof seal member 50 overlap is equal to or less than the size of the width in the width direction rd at the other portion of the dustproof seal member 50. In the illustrated example, these widths are the same. As a result, the dustproof seal member 50 can be accommodated in the circumferential groove 25 having a constant width while forming the abutment portion 55. The attachment of the seal S formed by such a dustproof seal member 50, particularly the arrangement in the groove 25, can be performed extremely easily.

As a more specific configuration, the inner end portion (inner portion) 51 has an outer side surface 51b facing outward in the radial direction with respect to the outer side surface 53b at the portion 53 adjacent to the inner end portion 51 of the dustproof seal member 50. Is tilted. Further, in the inner end portion 51, the inner side surface 51a facing inward in the radial direction is located on the same line as the inner side surface 53a in the portion 53 adjacent to the inner end portion 51 of the dustproof seal member 50.

On the other hand, in the outer end portion (outer portion) 52, the inner side surface 52a facing inward in the radial direction is inclined with respect to the inner side surface 53a in the portion 53 adjacent to the outer end portion 52 of the dustproof seal member 50. .. Further, in the outer end portion 52, the outer side surface 52b facing outward in the radial direction is located on the same line as the outer side surface 53b at the portion 53 adjacent to the end portion 52 of the dustproof seal member 50.

When such a dust-proof seal member 50 is used, it is possible to effectively prevent dust from flowing into the working chamber 11 together with the outside air leaked from the dust-proof seal structure. As a result of diligent studies by the inventors of the present invention, one of the main causes of the early deterioration of the tip sealing materials 23a and 33a is heat dissipation into the working chamber 11 which becomes a negative pressure during the operation of the scroll type fluid machine 10. It was confirmed that it was a part of the inflow of the cooling air directed to the fins 24 and 34. Then, according to the dustproof seal member 50 shown in FIG. 4, a leak at the joint portion 55 (cut portion CU) is effectively performed during the operation of the scroll type fluid machine 10 in which the dustproof seal structure is required to be hermetically sealed. Can be prevented.

During the operation of the scroll type fluid machine 10, the dustproof seal member 50 in contact with the fixed scroll 20 and the movable scroll 30 is heated and expanded by air compression in the working chamber 11 between the fixed scroll 20 and the movable scroll 30. The material of the dustproof sealing member 50, which is required to have airtightness and abrasion resistance, usually has a higher coefficient of linear expansion than the material used for the scrolls 20 and 30. Further, the dustproof seal member 50 has an elongated shape and tends to expand in the longitudinal direction in terms of shape. Therefore, the dustproof seal member 50 expands during the operation of the scroll type fluid machine 10. As a result, as shown by an arrow in FIG. 4, the outer side surface 51b of the inner end portion 51 and the inner side surface 52a of the outer end portion 52 are pressed against each other. Further, the inner side surface 51a of the inner end portion 51 is pressed against the inner wall inside the groove 25 by the wedge effect utilizing the inclination of the inner side surface 52a of the outer end portion 52. Further, the outer side surface 52b of the outer end portion 52 is pressed against the outer inner wall of the groove 25 by the wedge effect utilizing the inclination of the outer side surface 51b of the inner end portion 51. As a result, the dustproof seal member 50 seals between the fixed scroll 20 and the movable scroll 30 at the abutment portion 55 (cutting portion CU), effectively preventing the fluid (outside air) from flowing between both end portions 51. Can be prevented.

Further, according to such a configuration, the width of the dustproof seal member 50 at the cut portion CU is smaller than the width of the other portion of the dustproof seal member 50. Therefore, it is not necessary to change the width of the groove 25 formed in the fixed scroll 20 and accommodating the dustproof seal member 50. Therefore, the position of the dustproof seal member 50 is stable in the groove 25, and the outer side surface 51b of the inner end portion 51 and the inner side surface 52a of the outer end portion 52 can be maintained in contact with each other. From this point as well, it is possible to more effectively prevent leakage at the joint portion 55.

In the first example described above, the dustproof seal member 50 is a linear member held by one of the fixed scroll 20 and the movable scroll 30 and in contact with the other of the fixed scroll 20 and the movable scroll 30. The dustproof seal member 50 forms a joint portion 55 so that both end portions 51 and 52 overlap each other in the radial direction rd orthogonal to the circumferential direction cd and surrounds the action chamber 11. The inner end portion 51 of both ends forming the abutment portion 55 is tapered so that the outer side surface 51b is inclined with respect to the outer side surface 53b at the portion 53 adjacent to the inner end portion of the dustproof seal member 50. There is. Further, the outer side surface 52a of both end portions 51, 52 forming the abutment portion 55 is inclined with respect to the inner side surface 53a of the portion 53 adjacent to the outer end portion 52 of the dustproof seal member 50. And it is tapering. Then, the outer side surface 51b of the inner end portion 51 and the inner side surface 52a of the outer end portion 52 come into contact with each other. According to such a first example, leakage at the joint portion 55 can be effectively prevented. As a result, it is possible to effectively prevent the inflow of dust into the working chamber 11, and it is possible to effectively avoid unplanned early deterioration of the tip sealing materials 23a and 33a of the fixed lap 23 and the movable lap 33. can.

<Second example>
Next, a second example of a dustproof seal structure that makes it possible to effectively prevent leaks at the abutment portion will be described, mainly with reference to FIG. In the description of the second example and the subsequent description of further examples, the differences from the dustproof seal structure described as another example will be mainly described, and the other points will be described in other respects. It shall be possible to configure the same as the dustproof seal structure described as an example. Also, in the description of the second example and the subsequent description of further examples, and in FIGS. 4-22, it may be configured or function like any other example. The possible parts are given the same reference numerals as those used for the corresponding configurations of the other examples, and duplicate description is omitted.

In the example shown in FIG. 5, similarly to the first example, the cut portion CU (joint portion 55) is formed by the shapes of the portions (both ends of the dustproof seal member 50) 51 and 52 forming the cut portion CU. We are trying to prevent leaks. Also in the example shown in FIG. 5, both end portions 51 and 52 of the dustproof seal member 50 forming the cut portion CU overlap each other in the width direction (diameter direction) rd to form the abutment portion 55. As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape.

The dustproof seal member 50 has both end portions 51 and 52 and an intermediate portion 53 located between both end portions 51 and 52. The intermediate portion 53 may have a certain width. One end portion (one portion forming the cut portion CU) 51 of the dustproof seal member 50 has a recess 51c recessed in the circumferential direction cd on the end surface thereof. The other end of the dustproof seal member 50 (the other portion forming the cut portion CU) has a convex portion 52c on its end surface that protrudes in the circumferential direction cd and is inserted into the concave portion 51c. According to such a second example, the fluid (gas) that flows between both end portions 51 and 52 forming the cut portion CU and leaks from the abutment portion 55 (cut portion CU) is the recess 51c of the convex portion 52c. You need to go twice as deep as you enter. Moreover, the fluid leaking from the abutment portion 55 needs to be folded back in the reverse direction in the traveling direction along the circumferential direction cd in the recess 51c. As a result, the fixed scroll 20 and the movable scroll 30 can be effectively sealed, and leakage at the joint portion 55 can be effectively prevented. As a result, it is possible to effectively prevent the inflow of dust into the working chamber 11, and it is possible to effectively avoid unplanned early deterioration of the tip sealing materials 23a and 33a of the fixed lap 23 and the movable lap 33. can.

Further, in the second example, the portions 51 and 52 forming the cut portion CU are relatively movable in the circumferential direction cd while maintaining the overlap in the width direction rd. That is, the dustproof seal member 50 can be thermally expanded and contracted in the groove 25 while maintaining a constant width. Therefore, it is not necessary to change the width of the groove 25 formed in the fixed scroll 20. As a result, the arrangement of the dustproof seal member 50 in the groove 25 can be stabilized, and the convex portion 52c of the other end portion 52 is maintained in the recessed portion 51c of the one end portion 51. Can be done. From this point as well, it is possible to more effectively prevent leakage at the abutment portion 55 (cutting portion CU).

In addition, in the dust-proof seal member 50 of FIG. 4 described as the first example, one of the outer side surface 51b of the inner end portion (inner portion) 51 and the inner side surface 52a of the outer end portion (outer portion) 52 is shown in FIG. The indicated recess 51c is formed, and the convex portion 52c shown in FIG. 5 is formed on the other side of the outer side surface 51b of the inner end portion (inner portion) 51 and the inner side surface 52a of the outer end portion (outer portion) 52. You may.

<Third example>
Next, a third example of a dustproof seal structure that can effectively prevent leaks at the abutment portion will be described with reference to FIG. 6. In the example shown in FIG. 6, similarly to the first example and the second example, due to the shape of the portions (both ends of the dustproof seal member 50) 51 and 52 forming the cut portion CU, the joint portion is formed. We are trying to prevent leaks. Also in the example shown in FIG. 6, both end portions 51 and 52 of the dustproof seal member 50 overlap each other in the width direction rd to form a joint portion 55. As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape.

As shown in FIG. 6, especially in the third example, the linear dustproof seal member 50 has an inner end portion (inner portion) relatively inside in the radial rd as both end portions forming the abutment portion 55. It has a 51 and an outer end portion (outer portion) 52 located relatively outward in the radial direction. That is, the outer end portion 52 is located on the outer side of the inner end portion 51 in the width direction rd. Further, the dustproof seal member 50 further has an intermediate portion 53 located between the inner end portion 51 and the outer end portion 52. The intermediate portion 53 can have a certain width.

The inner end portion (inner portion) 51 coincides with the base portion 51d, which is narrower than the width wm of the portion 53 adjacent to the inner end portion 51 of the dustproof seal member 50, and the longitudinal direction (circumferential direction cd) of the dustproof seal member 50. It has a widening portion 51e which is located on the tip side of the base portion 51d and is wider than the base portion 51d along the direction of the base portion 51d. Similarly, the outer end portion (outer portion) 52 has a base portion 52d narrower than the width wm of the portion 53 adjacent to the outer end portion 52 of the dustproof seal member 50 and the dustproof seal member 50 along the longitudinal direction. It has a widening portion 52e located on the tip side of the base portion 52d and wider than the base portion 52d. The widening portion 51e of the inner end portion 51 faces the base portion 52d of the outer end portion 52 in the width direction rd, and the widening portion 52e of the outer end portion 52 faces the base portion 51d of the inner end portion 51 in the width direction rd. do.

According to such a third example, the fluid flowing between both end portions 51 and 52 forming the cut portion CU and leaking from the abutment portion 55 (cut portion CU) is with the widening portion 51e of the inner end portion 51. It is necessary to pass through both the gap between the outer end portion 52 and the base portion 52d and the gap between the widening portion 52e of the outer end portion 52 and the base portion 51d of the inner end portion 51. Further, it is possible to secure a relatively long length in which both ends 51 and 52 are parallel to the circumferential cd. As a result, leakage at the joint portion 55 can be effectively prevented. As a result, it is possible to effectively prevent the inflow of dust into the working chamber 11, and it is possible to effectively avoid unplanned early deterioration of the tip sealing materials 23a and 33a of the fixed lap 23 and the movable lap 33. can.

Further, in the third example, the portions 51 and 52 forming the cut portion CU are relatively movable in the circumferential direction cd while maintaining the overlap in the width direction rd. That is, the dustproof seal member 50 can be thermally expanded and contracted in the groove 25 while maintaining a constant width. Therefore, it is not necessary to change the width of the groove 25 formed in the fixed scroll 20. As a result, the arrangement of the dustproof seal member 50 in the groove 25 can be stabilized, and the convex portion 52c of the other end portion 52 is maintained in the recessed portion 51c of the one end portion 51. Can be done. From this point as well, it is possible to more effectively prevent leakage at the abutment portion 55 (cutting portion CU).

In addition, in the third example, the sum of the width w1e of the widened portion 51e of the inner end portion (inner portion) 51 and the width w2d of the base portion 52d of the outer end portion (outer portion) 52 is the sum of the width w2d of the dustproof seal member 50. It may be the same as or larger than the width wm of the intermediate portion 53 adjacent to the outer end portion 52. According to this configuration, the base of the widened portion 51e and the outer end portion 52 of the inner end portion 51 without unnecessarily restraining the relative movement of the dustproof seal member 50 to both end portions 51 and 52 due to thermal expansion or contraction. Leakage in the gap with the portion 52d can be effectively prevented. Similarly, the sum of the width w2e of the widening portion 52e of the outer end portion (inner portion) 52 and the width w1d of the base portion 51d of the inner end portion (inner portion) 51 is adjacent to the inner end portion 51 of the dustproof seal member 50. It may be the same as or larger than the width wm of the portion 53 to be formed. According to this configuration, the widening portion 52e of the outer end portion 52 and the base of the inner end portion 51 are not restrained unnecessarily from the relative movement of the dustproof seal member 50 to both ends 51 and 52 due to thermal expansion or contraction. Leakage in the gap with the portion 51d can be effectively prevented.

<Fourth example>
Next, a fourth example of the dust-proof seal structure capable of effectively preventing leakage at the joint portion will be described with reference to FIGS. 7 to 9. In the examples shown in FIGS. 7 to 9, cutting is performed by applying an external force to the abutment portion without imposing restrictions on the shapes of the portions (both ends forming the abutment portion) 51 and 52 forming the abutment portion CU. We are trying to prevent leaks at the CU (joint).

Also in the examples shown in FIGS. 7 to 9, both end portions 51 and 52 forming the cut portion CU of the dustproof seal member 50 overlap each other in the width direction rd to form the abutment portion 55. As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape. The scroll type fluid machine 10 of the fourth example further has a pressing means 60 for pressing one portion forming the cut portion CU toward the other portion. In other words, the scroll type fluid machine 10 further has a pressing means 60 for pressing one end 51 forming the abutment 55 of the dustproof seal member 50 toward the other end 52.

The pressing means 60 presses one portion 51 forming the cut portion CU toward the other portion 52 in the width direction (diameter direction) rd, and the other portion 52 toward the one portion 51 in the width direction. It may be pressed in the (diameter direction) rd. Alternatively, the pressing means 60 presses one portion 51 inward or outward in the width direction (diameter direction) rd toward the other portion 52 supported by the wall portion that partitions the groove 25, and presses the groove 25. The portions 51 and 52 forming the cut portion CU may be brought into contact with each other with the partitioning wall portion.

In the example of FIGS. 7 and 8, the scroll type fluid machine 10 has a first pressing means 61 and a second pressing means 62. The first pressing means 61 presses the inner end portion (inner portion) 51 outward in the radial direction to urge the inner end portion 51 into contact with the outer end portion (outer portion) 52. The second pressing means 62 presses the outer end portion (outer portion) 52 inward in the radial direction to urge the outer end portion 52 into contact with the inner end portion (inner portion) 51.

The fixed scroll 20 is formed with an accommodating portion 26 for accommodating the first pressing means 61 at a position inside the radial rd of the groove 25, and a second pressing is performed at a position outside the radial rd of the groove 25. A housing portion 26 for housing the means 62 is formed. Each pressing means 61, 62 has a plate material 61a, 62a and elastic members 61b, 62b stored in the accommodating portion 26. The plate members 61a and 62a are fixed to the fixed scroll 20 at one end thereof. The other ends of the plate members 61a and 62a are pressed against the elastic members 61b and 62b. The elastic members 61b and 62b press the corresponding plate members 61a and 62a toward the abutment portion 55 of the dustproof seal member 50 housed in the groove 25. In particular, the illustrated pressing means 61, 62 are adapted to press one end toward the other end along the radial rd. In the illustrated example, the elastic members 61b and 62b are formed of a compression spring, but the present invention is not limited to this example, and the elastic members 61b and 62b may be formed of, for example, a rubber tube or the like.

In the examples shown in FIGS. 7 and 8, one of the first pressing means 61 and the second pressing means 62 can be omitted.

Further, in the example shown in FIG. 7, the dustproof seal member 50 has the same configuration as the dustproof seal member described in the first example, as the configuration of both end portions 51 and 52 forming the abutment portion 55 (cut portion CU). An example having a configuration is shown, but the present invention is not limited to this. The pressing means 60 can be applied to the dust-proof seal member 50 of various forms, for example, to the dust-proof seal member 50 described as the second example or the third example.

Further, the specific configuration of the pressing means 60 is not limited to the examples shown in FIGS. 7 and 8, and various forms can be adopted. As an example, in the example shown in FIG. 9, the pressing means 60 includes a fluid ejection mechanism 63. The fluid ejection mechanism 63 is a mechanism capable of ejecting a fluid made of gas or liquid, and has a fluid source 63a and an orifice 63b through which a fluid supplied from the fluid source 63a passes. The fixed scroll 20 has a spout 27 formed on the bottom surface of the groove 25. The fluid that has passed through the orifice 63b is ejected into the groove 25 through the ejection port 27. In the illustrated example, the spout 27 is formed to be offset to one side in the radial rd of the bottom surface of the groove 25. Therefore, the pressure in the groove 25 is high on one side in the radial rd and low on the other side in the radial rd. As a result, one end located on one side in the radial rd is pressed toward the other end located on the other side in the radial rd.

In the fourth example as described above, the dustproof seal member 50 is a linear dustproof seal member held by one of the fixed scroll 20 and the movable scroll 30 and in contact with the other of the fixed scroll 20 and the movable scroll 30. The dustproof seal member 50 forms a joint portion 55 so that the two portions (both ends) 51 and 52 forming the cut portion CU overlap in the width direction (diameter direction) rd orthogonal to the circumferential direction cd to form the action chamber 11. Surrounds. The scroll type fluid machine 10 further has a pressing means 60 for pressing one end of the dustproof seal member 50 toward the other end. By using the pressing means 60 to press one portion (one end of the dustproof seal member 50) forming the cut portion CU toward the other portion (the other end), the cut portion CU (joint opening) is pressed. In the portion 55), it becomes difficult for the fluid to pass between both portions (both ends) 51 and 52. Therefore, it is possible to effectively prevent leakage at the cut portion CU (joint portion 55). As a result, it is possible to effectively prevent the inflow of dust into the working chamber 11, and it is possible to effectively avoid unplanned early deterioration of the tip sealing materials 23a and 33a of the fixed lap 23 and the movable lap 33. can.

Further, in the examples shown in FIGS. 7 and 8, the pressing means has one portion (end portion) forming the cut portion CU along the width direction (diameter direction) rd and the other portion (end portion). Press toward. According to such a pressing means, it is possible to maintain a state in which one portion (end portion) is stably in contact with the other portion (end portion), thereby causing a leak at the abutment portion 55. It can be prevented more effectively.

Further, the pressing means may have elastic members 61b, 62b. Such a pressing means can be manufactured at low cost with a simple structure, and on the other hand, the pressing force can be stably supplied.

On the other hand, in the example shown in FIG. 9, the pressing means 60 includes a fluid ejection mechanism 63. By using the fluid ejected from the fluid ejection mechanism 63, one portion (end portion) forming the cut portion CU is pressed toward the other portion (end portion) along the radial rd, and one portion is pressed. The (end) can be stably kept in contact with the other portion (end), whereby leakage at the abutment 55 can be prevented more effectively. Further, like the dustproof seal member 50, the urging means 48 is also pressed along the width direction (diameter direction) rd. The annular urging means 48 having a hollow circular cross section is pressed by the fluid from the fluid ejection mechanism 63 in the radial direction and is deformed so as to expand along the axial direction a. As a result, the fixed scroll 20 is brought into close contact between the dustproof seal member 50 and the movable scroll 30, between the dustproof seal member 50 and the urging means 48, and between the urging means 48 and the groove 25, respectively. It becomes possible to more stably seal between the movable scroll 30 and the movable scroll 30. Further, by adjusting the fluid ejection amount, the ejection speed, the ejection pressure, etc. from the fluid ejection mechanism 63, a force for pressing one portion (end portion) forming the cut portion CU to the other portion (end portion) is applied. Can be adjusted. Further, the pressing force can be generated without using a mechanical structure that can be a source of dust.

In addition, in the example of FIG. 9 in which the ejection port 27 is formed on the outer side of the bottom surface of the groove 25 in the radial direction, the urging means 48 and the dustproof seal member 50 are formed by the fluid ejected from the fluid ejection mechanism 63. Is pressed inward in the radial rd. That is, the urging means 48 and the dustproof seal member 50 are pressed toward the side wall located inside the axial ad of the groove 25. On the other hand, the fluid ejected from the fluid ejection mechanism 63 flows outward in the radial direction from the gap between the fixed scroll 20 and the movable scroll 30, and is discharged to the outside. This makes it possible to more effectively prevent the intrusion of dust from the outside through the same gap. Even if a part of the cooling air for each of the scrolls 20 and 30 tries to flow in from the outside through the gap, the fluid is injected from the fluid ejection mechanism 63 at a pressure higher than the inflow pressure (for example, 800 Pa) (for example, 1 kPa). The inflow can be effectively prevented.

Further, in the example shown in FIG. 9, a circumferential groove 25 surrounding the action chamber 11 is formed in one of the fixed scroll 20 and the movable scroll 30, and the dustproof seal member 50 is arranged in the groove 25. The fluid ejection mechanism 63 ejects the fluid into the groove 25. According to such a fluid ejection mechanism 63, it is possible to apply it to the existing scroll type fluid machine 10 without restricting the configuration of the scroll type fluid machine 10 itself.

<Fifth example>
Next, a fifth example of a dustproof seal structure that can effectively prevent leakage at the joint portion will be described with reference to FIGS. 10 and 11. In the examples shown in FIGS. 10 and 11, the cut portion CU is formed without imposing restrictions on the engaging surfaces of the two portions (both ends forming the abutment portion) 51 and 52 that form the cut portion CU. By generating a force that presses the two portions (both ends) 51 and 52 toward each other, leakage at the cut portion CU (joint portion) is prevented.

Also in the examples shown in FIGS. 10 and 11, a circumferential groove 25 surrounding the action chamber 11 is formed in one of the fixed scroll 20 and the movable scroll 30, and the dustproof seal member 50 is arranged in the groove 25. There is. Further, the two portions (both ends of the dustproof seal member 50) 51 and 52 forming the cut portion CU overlap each other in the width direction (diameter direction) rd to form the abutment portion 55. As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape. Further, the dustproof seal member 50 has two portions (both ends forming the abutment portion 55) forming the cut portion CU, in the width direction (diameter direction) rd of the inner end portion (inner portion) 51 and the inner end portion 51. It includes an outer end portion (outer portion) 52 located on the outer side.

The dustproof seal member 50 includes an inner extending piece (inner lip) 51f protruding inward in the radial direction from the inner side surface 51a facing inward in the radial direction of the inner end portion 51, and an outer end portion 52. At least one of the outer extending pieces (outer lips) 52f protruding outward in the radial rd from the outer side surface 52b facing outward in the radial rd is provided. In the illustrated example, the inner end portion 51 is provided with the inner extension piece 51f, and the outer end portion 52 is provided with the outer extension piece 52f. The inner extending piece 51f abuts on the inner wall surface of the groove 25 in the radial rd and presses the inner end 51 toward the outer end 52 along the radial rd. The outer extending piece 52f abuts on the wall surface located on the outer side in the radial rd of the groove 25 and presses the outer end portion 52 toward the inner end portion 51 along the radial rd. The extending pieces 51f and 52f keep the two portions (both ends of the dustproof seal member 50) 51 and 52 forming the cut portion CU in contact with each other in the width direction (diameter direction) rd. Leakage at the abutment portion 55 can be effectively prevented. As with the pressing means 60 in the fourth example, it is also possible to omit either the inner extension piece 51f or the outer extension piece 52f.

From the viewpoint of preventing leakage at the abutment portion 55, it is preferable that the inner extending piece 51f and the outer extending piece 52f are elastically deformable. Further, the sum of the maximum width in the radial rd of the inner end portion 51 including the inner extending piece 51f and the maximum width in the radial rd of the outer end portion 52 including the outer extending piece 52f is the radial direction of the groove 25. It is effective to prevent leakage at the abutment portion 55 when the width is larger than the width at the rd.

As is well shown in FIG. 11, the medial extension piece 51f is tapered inward in the radial rd and the outer extension piece 52f is tapered outward in the radial rd. According to such an example, the elastic force of the inner extension piece 51f and the outer extension piece 52f is stably exhibited, and both ends 51 and 52 of the dustproof seal member 50 are in contact with each other in the radial direction. Can be maintained stably.

Further, as is well shown in FIG. 11, the inner extension piece 51f includes a tip side surface 51fa and a base end side surface 51fb facing the longitudinal direction (direction corresponding to the circumferential direction cd) of the dustproof seal member 50. There is. The tip side surface 51fa is a surface on the side close to the tip of the inner end portion 51 along the longitudinal direction of the dustproof seal member 50, and the base end side surface 51fb is an intermediate portion along the longitudinal direction of the dustproof seal member 50. This is the surface on the side close to 53. Then, in the observation from the direction in which the fixed scroll and the movable scroll face each other (that is, observed in FIG. 11 along the axial direction ad), the angle formed by the tip side surface 51fa with respect to the longitudinal direction of the dustproof seal member 50 (strictly speaking). , The smaller angle (inferior angle) of the two corners) θ1a is the angle formed by the base end side surface 51fb with respect to the longitudinal direction of the dustproof seal member 50 (strictly speaking, the smaller of the two corners). Angle (inferior angle)) It is smaller than θ1b. According to such an inner extending piece 51f, it is possible to make it difficult to hinder the movement of the inner extending piece 51f in the groove 25 at the time of thermal expansion of the dustproof seal member 50. As a result, it is possible to effectively prevent the dust-proof seal member 50 from causing meandering, twisting, bending, etc. in the groove 25, and to stabilize the arrangement of the dust-proof seal member 50 in the groove 25. At the same time, the force for urging the inner end portion 51 toward the outer end portion 52 can be effectively exerted, especially at the time of heat shrinkage. From these facts, it is possible to more effectively prevent leakage at the cut portion CU (joint portion 55).

Further, in the example shown in FIG. 11, the outer extension piece 52f is also configured in the same manner as the inner extension piece 51f. That is, the outer extending piece 52f includes the tip side surface 52fa and the base end side surface 52fb facing the dustproof seal member 50 in the longitudinal direction. The tip side surface 52fa is a surface on the side close to the tip of the outer end portion 52 along the longitudinal direction of the dustproof seal member 50, and the base end side surface 52fb is an intermediate portion along the longitudinal direction of the dustproof seal member 50. This is the surface on the side close to 53. When observing from the direction in which the fixed scroll and the movable scroll face each other, the angle θ2a formed by the front end side surface 52fa with respect to the longitudinal direction of the dustproof seal member 50 is such that the proximal end side surface 52fb is with respect to the longitudinal direction of the dustproof seal member 50. It is smaller than the angle θ2b. Similar to the inner extension piece 51f, such a configuration of the outer extension piece 52f also makes it possible to more stably prevent leakage at the cut portion CU (joint portion 55).

<Sixth example>
Next, a sixth example of a dustproof seal structure that can effectively prevent leaks at the abutment portion will be described with reference to FIG. 12. In the example shown in FIG. 12, the cut portion CU is used by using the paste-like material 28 without imposing restrictions on the engaging surfaces of the portions (both ends forming the abutment portion) 51 and 52 that form the cut portion CU. We are trying to prevent leaks at the (joint).

Also in the example shown in FIG. 12, a circumferential groove 25 surrounding the working chamber 11 is formed in one of the fixed scroll 20 and the movable scroll 30, and the dustproof seal member 50 is arranged in the groove 25. Further, the two portions (both ends of the dustproof seal member 50) 51 and 52 forming the cut portion CU overlap each other in the width direction (diameter direction) rd to form the abutment portion 55. As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape.

Then, in the sixth example, the paste-like material 28 is filled in at least the region around the cut portion CU (joint portion 55) in the groove 25. The paste-like material 28 includes a semi-solid material and a highly viscous material. Typically, grease can be used as the paste-like material 28. Generally, grease is used as a lubricant in mechanical devices and the like. On the other hand, in this example, in addition to preventing leakage at the cutting portion CU (joint portion 55), it can be expected that dust and the like will be captured. As confirmed by the inventors of the present invention, the paste-like material 28 gradually decreases in fluidity and hardens when it captures dust and the like. The paste-like material 28 cured in this way usually cannot achieve its original purpose (for example, the lubrication action by grease). However, in the use in this example, hardening and reducing the fluidity means that the paste-like material 28 stays at the abutment portion 55 and contributes to the prevention of leakage and the capture of dust at the abutment portion 55. It can be said that such a function of the paste-like material 28 is particularly suitable for the oil-free scroll type fluid machine 10 having a low maintenance frequency.

Although FIG. 12 shows the configurations of the two portions (both ends of the dustproof seal member 50) 51 and 52 forming the cut portion CU, the illustrated configuration is merely an example. When the urging means provided between the dust-proof sealing member 50 and the groove 25 is linear in the same manner as the dust-proof sealing member 50, the paste-like material 28 effectively functions at the abutment portion of the urging means. can do. Further, for example, the paste-like material 28 can effectively function for the cut portion CU (joint portion 55) shown in FIGS. 10 and 11 and other cut portions (joint portion). In the examples shown in FIGS. 10 and 11, the paste-like material 28 is provided on the outer side surface 51b of the inner end portion (inner portion) 51, but the inner side surface of the outer end portion (outer portion) 52. The paste-like material 28 may be provided on the 52a, or the paste-like material 28 may be provided on both the outer side surface 51b of the inner end portion (inner portion) 51 and the inner side surface 52a of the outer end portion (outer portion) 52. May be provided.

According to the sixth example as described above, the paste-like material 28 is located in the groove 25 at least between the two ends 51 and 52 forming the cut portion CU, preferably in the region around the abutment portion 55. Is filled. According to such a paste-like material 28, the paste-like material 28 seals between the two portions (both ends 51 and 52 at the abutment portion 55) forming the cut portion CU, whereby the cut portion CU ( Leakage at the abutment portion 55) can be prevented, and dust can be captured. Further, the paste-like material 28 reduces the fluidity by capturing dust. The paste-like material 28 having reduced fluidity can stay in the cut portion CU (joint portion 55) and continue to exhibit the leak prevention function and the dust trapping function, and is particularly effective for the oil-free scroll type fluid machine 10. be.

<< Second aspect >>
Next, a second aspect of the seal structure will be described. The seal S used in the second aspect is a non-bearing annular metal first seal portion that is relatively movable and is arranged on one of the first component 20 and the second component 30 facing each other. It has a Sa and a second seal portion Sb made of resin or rubber, which is an unsupported annular shape and is provided on the first seal portion Sa and comes into contact with the other of the first component 20 and the second component 30. There is.

According to such a second aspect, first, the airtightness can be improved by not providing the abutment portion. Further, according to the first seal portion Sa made of metal, which is less likely to be thermally deformed as compared with the resin and rubber which have been widely used in the past, it is possible to impart rigidity and durability to the seal S, and thermal expansion and thermal contraction can be performed. Can also be effectively suppressed. This makes it possible to effectively prevent the occurrence of meandering and twisting in the dustproof seal member 50. Further, by including the second seal portion Sb made of resin or rubber, it is possible to secure a close seal with the first part or the second part. Therefore, also by the second aspect, the space between the first component 20 and the second component can be tightly sealed. That is, according to the second aspect, the combination of the first seal portion Sa, which is less likely to be thermally deformed, and the second seal portion Sb, which is excellent in airtightness, stabilizes the space between the first component 20 and the second component 30. Can be sealed. When applied to the scroll type fluid machine 10, it is possible to effectively prevent the inflow of dust into the working chamber 11, and the tip sealing materials 23a and 33a of the fixed lap 23 and the movable lap 33 are unexpectedly deteriorated at an early stage. Can be effectively avoided.

In such a second aspect, the thickness of the second seal portion Sb (the dimension of the second seal portion Sb along the axial direction ad) is the thickness of the first seal portion Sa (the first along the axial direction ad). It is preferable that the size is smaller than the size of the seal portion Sa). Further, it is preferable that the aspect ratio of the second seal portion Sb (value of the height to width) is smaller than the aspect ratio of the first seal portion Sa (value of the height to width). In these cases, the amount of deformation of the second seal portion Sb, which is more easily deformed than the first seal portion Sa, in the axial direction a can be effectively reduced. As a result, it is possible to effectively prevent a decrease in the airtightness between the second seal portion Sb and the first component 20 or the second component 30.

The first seal portion Sa and the second seal portion Sb may be integrally formed to form one dustproof seal member 50. Such an example is shown in the seventh example described later. Further, the first seal portion Sa and the second seal portion Sb may form a separate dustproof seal member 50. Such an example is shown in the eighth example described later.

Hereinafter, the second aspect of the seal structure will be described with reference to specific examples. However, the following specific configuration is merely an example, and various changes can be made.

<7th example>
Next, a seventh example of the dustproof seal structure will be described mainly with reference to FIGS. 13 and 14. In the examples shown in FIGS. 13 and 14, the dust-proof seal member 50 is designed to improve the airtightness by not providing the abutment portion in the dust-proof seal member.

In the example shown in FIGS. 13 and 14, one dustproof seal member 50 integrally formed between the fixed scroll 20 and the movable scroll 30 is provided as a seal (seal component) S. .. The dustproof seal member 50 includes a first seal portion Sa which is an unbearable ring and is made of metal, and a second seal portion Sb which is an unbearable ring and is made of resin or rubber.

The dustproof seal member 50 shown in FIGS. 13 and 14 is held by one of the fixed scroll 20 and the movable scroll 30 and abuts on the other of the fixed scroll 20 and the movable scroll 30. The dustproof seal member 50 takes in the action chamber 11 and seals between the fixed scroll 20 and the movable scroll 30. The dustproof seal member 50 has an annular main body portion 56 that is a non-bearing annular and is made of metal.

The joint portion 55 is provided so that the dustproof seal member 50 allows thermal expansion and contraction of the dustproof seal member 50 in the groove 25 formed in one of the scrolls 20 and 30. During the operation of the scroll type fluid machine 10, the scrolls 20 and 30 increase in temperature mainly due to air compression in the working chamber 11. Along with the temperature change of the scrolls 20 and 30, the temperature of the dustproof seal member 50 also changes. Due to the temperature change of the dustproof seal member 50, the dustproof seal member 50 is thermally deformed. In the conventional scroll type fluid machine 10, the dustproof seal member 50 is formed of a resin or rubber that is easily deformed by heat.

In the seventh example, the dustproof seal member 50 has a non-bearing annular metal annular body portion 56. The annular main body portion 56 forms the first seal portion Sa of the seal (seal component) S. The annular main body 56 is made of a metal that is less likely to be thermally deformed than the resin or rubber that has been widely used in the past. Further, the material used for the scrolls 20 and 30 is generally a metal having high rigidity and wear resistance, similarly to the annular main body portion 56. Therefore, the metal annular body 56 can effectively suppress thermal expansion and contraction, and further exhibits deformation behavior similar to that of the groove 25 holding the annular body 56. Further, the metal annular body portion 56 itself has high rigidity and is unlikely to be deformed by twisting or the like. From these facts, the non-bearing annular and metal annular body portion 56 effectively prevents meandering and twisting in the groove 25 during the operation of the scroll type fluid machine 10 even without the abutment portion 55. It is possible to stably seal between the fixed scroll 20 and the movable scroll 30. Moreover, since it is possible to prevent a leak that has been routed between both ends of the joint portion 55, it is possible to effectively prevent dust from entering the working chamber 11.

As a material for the fixed scroll 20 and the movable scroll 30, an aluminum alloy having appropriate rigidity, excellent heat dissipation, and light weight is widely used. Therefore, it is preferable that the material of the annular main body 56 is aluminum or an aluminum alloy. According to this example, the linear expansion coefficients of the annular main body 56 and the scrolls 20 and 30 forming the groove 25 are about the same, and the dustproof seal member 50 meanders and bends in the groove 25 due to the difference in the expansion rate and the contraction rate. , Twisting and the like can be suppressed more effectively, and the space between the fixed scroll 20 and the movable scroll 30 can be more stably sealed.

Further, as shown in FIG. 14, in the illustrated example, the dustproof seal member 50 further has a fluorine-based resin layer 57 laminated on the annular main body portion 56. The fluorine-based resin layer 57 forms the second seal portion Sb of the seal (seal component) S. The fluorine-based resin layer 57 comes into contact with a scroll (movable scroll 30 in the illustrated example) on the side opposite to the side holding the dustproof seal member 50. The fluorine-based resin layer 57 has excellent abrasion resistance, as typified by, for example, polytetrafluoroethylene (PTFE). Therefore, by providing the fluorine-based resin layer 57, it is possible to effectively prevent the dust-proof seal member 50 from being worn and the wear powder from flowing into the working chamber 11. The thickness of the fluororesin layer 57 may be very thin, about several hundred μm, with respect to the annular main body portion 56 having a thickness of about several mm.

<8th example>
Next, an eighth example of the dustproof seal structure will be described mainly with reference to FIGS. 15 to 18. In the examples shown in FIGS. 15 to 18, the dust-proof seal member is not provided with a joint to improve the airtightness of the dust-proof seal member.

In the example shown in FIGS. 15 and 16, the scroll type fluid machine 10 is arranged on the first dustproof seal member 50a supported by one of the fixed scroll 20 and the movable scroll 30 and the first dustproof seal member 50a. It also has a second dustproof seal member 50b. Of these, the first dustproof seal member 50a forms the first seal portion Sa, and the second dustproof seal member 50b forms the second seal portion Sb. Then, the second dustproof seal member 50b comes into contact with the other of the fixed scroll 20 and the movable scroll 30. The first dustproof seal member 50a and the second dustproof seal member 50b surround the working chamber 11 and seal between the fixed scroll 20 and the movable scroll 30.

The first dustproof seal member 50a and the second dustproof seal member 50b are formed in a seamless endless annular shape. Therefore, the aikuchi that was the cause of the leak is not formed. That is, since it is possible to prevent a conventional leak that has been routed between both ends of the joint, it is possible to effectively prevent dust from entering the working chamber 11.

The first dustproof seal member 50a forming the first seal portion Sa is made of a metal that is less likely to be thermally deformed than the resin or rubber that has been widely used in the past. The material used for the scrolls 20 and 30 is generally a metal having high rigidity and wear resistance, similarly to the first dustproof sealing member 50a. Therefore, the metal first dust-proof seal member 50a can effectively suppress thermal expansion and heat shrinkage, and further exhibits deformation behavior similar to that of the groove 25 holding the first dust-proof seal member 50a. become. Further, the metal first dustproof seal member 50a itself has high rigidity and is less likely to be deformed by twisting or the like. From these facts, the non-bearing annular and metal annular main body 56 has the first dustproof seal member 50a which can cause a leak in the groove 25 during the operation of the scroll type fluid machine 10 even if the abutment portion 55 is not provided. It is possible to effectively prevent the occurrence of meandering and twisting.

As described above, as a material for the fixed scroll 20 and the movable scroll 30, an aluminum alloy having appropriate rigidity, excellent heat dissipation, and light weight is widely used. Therefore, it is preferable that the material of the first dustproof seal member 50a is aluminum or an aluminum alloy. According to this example, the linear expansion coefficients of the first dustproof seal member 50a and the scrolls 20 and 30 forming the groove 25 are about the same, and the first dustproof seal member 50a in the groove 25 due to the difference in expansion coefficient and shrinkage rate. It is possible to more effectively suppress meandering, bending, twisting, etc., and to more stably seal between the fixed scroll 20 and the movable scroll 30.

The second dustproof seal member 50b forming the second seal portion Sb is made of resin or rubber. As shown in FIG. 16, the resin or rubber second dustproof seal member 50b is arranged so as to be overlapped with each other in the groove 25 in the direction in which the fixed scroll 20 and the movable scroll 30 face each other (axial direction ad). In particular, the second dustproof seal member 50b is arranged on the first dustproof seal member 50a and is pressed toward the scroll by the urging means 48 via the first dustproof seal member 50a. It has excellent airtightness between the second dustproof seal member 50b made of resin or rubber and the scroll. Therefore, the fixed scroll 20 and the movable scroll 30 can be effectively sealed.

Such a second dustproof seal member 50b can be formed by using a fluororesin. Fluorine-based resins have excellent abrasion resistance, as typified by, for example, polytetrafluoroethylene (PTFE). Therefore, according to the second dust-proof seal member 50b made of a fluororesin, it is possible to effectively prevent the second dust-proof seal member 50b from being worn and the wear powder from flowing into the action chamber 11.

The second dust-proof seal member 50b made of resin or rubber has an excellent airtightness, but has a relatively large coefficient of thermal expansion. Therefore, during the operation of the scroll type fluid machine 10, heat generation caused by air compression causes thermal deformation to some extent. In the example shown in FIG. 17, although the first dustproof seal member 50a and the second dustproof seal member 50b are arranged in the groove 25, the width wb along the radial direction of the second dustproof seal member 50b is a groove. It is sufficiently smaller than the width wm of. Therefore, the groove 25 for holding the second dustproof seal member 50b enables thermal expansion and contraction of the second dustproof seal member 50b. In particular, in the illustrated example, the width wa of the first dustproof seal member 50a is wider than the width wb of the second dustproof seal member 50b. Therefore, the narrow second dustproof seal member 50b can expand or contract and move in the radial direction on the wide first dustproof seal member 50a. Thereby, during the operation of the scroll type fluid machine 10, it is possible to effectively prevent the occurrence of meandering and twisting of the second dustproof seal member 50b which may cause a leak in the groove 25.

Further, in the illustrated example, as shown in FIG. 16, the surface with which the first dustproof seal member 50a and the second dustproof seal member 50b abut is inclined with respect to the radial rd. More specifically, the first dustproof seal member 50a has a first surface 50a1 facing the movable scroll 30 side in the axial direction a and a second surface 50a2 facing the fixed scroll 20 side in the axial direction a. ing. The second dustproof seal member 50b has a first surface 50b1 facing the movable scroll 30 side in the axial direction a and a second surface 50b2 facing the fixed scroll 20 side in the axial direction a. Then, the first surface 50a1 of the first dustproof seal member 50a and the second surface 50b2 of the second dustproof seal member 50b form a contact surface, and the first surface 50a1 and the first surface forming the contact surface are formed. The two surfaces 50b2 are inclined with respect to the radial rd. On the other hand, the second surface 50a2 of the first dustproof seal member 50a and the first surface 50b1 of the second dustproof seal member 50b are parallel to the radial rd. That is, the thickness of the first dustproof seal member 50a along the axial direction ad changes along the radial direction rd, and the thickness of the second dustproof seal member 50b along the axial direction ad also changes along the radial direction rd. The thickness of the first dust-proof seal member 50a becomes thicker toward the outside of the radial rd, and the thickness of the second dust-proof seal member 50b becomes thinner toward the outside of the radial rd. Along with this, the contact surfaces of the first dustproof seal member 50a and the second dustproof seal member 50b move from the fixed scroll 20 side to the movable scroll 30 side toward the outside of the radial rd.

In the example shown in FIG. 16, the first dustproof seal member 50a and the second dustproof seal member 50b are in the state shown by the solid line at low temperature. On the other hand, when heat generation mainly caused by air compression occurs during the operation of the scroll type fluid machine 10, the first dustproof seal member 50a and the second dustproof seal member 50b move to the state indicated by the alternate long and short dash line. That is, when the second dustproof seal member 50b thermally expands and moves to the outside of the radial rd in the groove 25 due to heat generation, the first dustproof seal member 50a is on the side of the fixed scroll 20 along the axial direction ad. Move to. At this time, the pressing force from the urging means 48 that presses the second dustproof seal member 50b against the movable scroll 30 gradually increases. In the example shown in FIG. 16, the urging force from the urging means 48 increases during thermal expansion and after thermal expansion after the start of operation of the scroll type fluid machine 10, and the fixed scroll 20 and the movable scroll 30 The space can be stably sealed.

However, the configuration of the contact surface of the first dustproof seal member 50a and the second dustproof seal member 50b is not limited to the example shown in FIG. 16, and for example, the examples shown in FIGS. 17 and 18 shall be adopted. You can also. In the example shown in FIG. 17, the contact surfaces of the first dustproof seal member 50a and the second dustproof seal member 50b are the same as those shown in FIG. According to this example, at the time of thermal expansion after the operation of the scroll type fluid machine 10 is started, the second dustproof seal member 50b easily moves on the first dustproof seal member 50a to the outside of the radial rd, and the second dustproof seal member 50b is easily moved to the outside of the second dustproof seal member 50a. The thermal expansion of the seal member 50b is less likely to be hindered. As a result, deformation such as meandering and twisting of the first dustproof seal member 50a and the second dustproof seal member 50b is effectively prevented. Further, in the example shown in FIG. 18, the first surface 50a1 and the second surface 50a2 of the first dustproof seal member 50a, and the first surface 50b1 and the second surface 50b2 of the second dustproof seal member 50b are in the radial direction. It is parallel to rd. Therefore, the postures of the first dustproof seal member 50a and the second dustproof seal member 50b in the groove 25 are stable, and the fixed scroll 20 and the movable scroll 30 can be stably sealed.

Also in FIGS. 17 and 18, similarly to FIG. 16, the states of the first dustproof seal member 50a and the second dustproof seal member 50b at low temperature are shown by solid lines, and the first dustproof seal member 50a and the first dustproof seal member 50a at high temperature are shown. 2 The state of the dustproof seal member 50b is shown by a two-dot chain line.

In the eighth example described above, the scroll type fluid machine 10 is supported by one of the fixed scroll 20 and the movable scroll 30 and surrounds the working chamber 11. It has a second dustproof seal member 50b made of resin or rubber, which is an unsupported annular shape provided on the first dustproof seal member 50a and abuts on the other side of the fixed scroll 20 and the movable scroll 30. According to such a scroll type fluid machine 10, it is fixed by a combination of a first dustproof seal member 50a which is hard to be thermally deformed during operation of the scroll type fluid machine 10 and a second dustproof seal member 50b which is excellent in airtightness. The space between the scroll 20 and the movable scroll 30 can be stably sealed.

Further, a circumferential groove 25 surrounding the action chamber 11 is formed in one of the fixed scroll 20 and the movable scroll 30, and the first dustproof seal member 50a and the second dustproof seal member 50b are fixed in the same groove 25. The scroll 20 and the movable scroll 30 are arranged so as to be overlapped with each other in the facing direction. With such an arrangement, the first dustproof seal member 50a and the second dustproof seal member 50b can more stably exhibit the above-mentioned sealing function.

Further, the width wa of the first dustproof seal member 50a is wider than the width wb of the second dustproof seal member 50b. As a result, the second dustproof seal member 50b, which tends to have a high coefficient of thermal expansion, can move in the radial direction on the first dustproof seal member 50a, whereby the first dustproof seal member 50a and the first dustproof seal member 50a and The combination of the second dustproof seal member 50b makes it possible to more stably seal between the fixed scroll 20 and the movable scroll 30.

Further, the contact surface with which the first dustproof seal member 50a and the second dustproof seal member 50b abut is inclined with respect to the radial rd. According to such a structure of the contact surface, the fixed scroll 20 and the movable scroll 30 can be stably sealed even when the first dustproof seal member 50a and the second dustproof seal member 50b are thermally deformed. can.

<< Third aspect >>
Next, a third aspect of the seal structure will be described. The seal (seal component) S in the third aspect is relatively movable and is arranged in contact with each other between the first component 20 and the second component 30 facing each other. The annular seals S are overlapped at one or more places in contact with each other in the width direction rd, and the length of the narrowest portion of the seal S along the circumferential direction cd defined by the seal S is the circumferential direction. It is shorter than the length of the other part of the seal S along the cd. In other words, the annular seal S includes a region in which two or more portions thereof are arranged so as to overlap in the width direction rd. The length of the region Ay (see FIGS. 19 and 21) in which two or more portions of the seal S overlap is the circumferential cd of the other region Ax (see FIGS. 19 and 21). It is longer than the length along. In other words, the length along the circumferential cd of the region Ay in which the seal S overlaps in the width direction rd in double or triple is the circumferential cd of the region Ax in which the seal S alone extends in the circumferential cd. It is longer than the length along.

According to such an aspect, the region where the seals S are overlapped and arranged in the width direction becomes long. In particular, it is also possible to make the seals S overlap in the width direction in a region exceeding half along the entire length of the annular seal S. According to such an aspect, the area surrounded by the annular seal S can be effectively sealed from the outside by lengthening the entry path of foreign matter such as dust. When applied to the scroll type fluid machine 10, it is possible to effectively prevent the inflow of dust into the working chamber 11, and the tip sealing materials 23a and 33a of the fixed lap 23 and the movable lap 33 are unexpectedly deteriorated at an early stage. Can be effectively avoided.

Further, in the third aspect, one dustproof seal member 50 is independently provided in the narrowest portion, and as shown in FIG. 21, such a narrowest portion Ax is the dustproof seal S. Two or more may be provided apart from each other in the circumferential direction cd. In other words, two or more regions Ay in which two or more portions of the seal S overlap in the width direction rd may be provided so as to be separated from each other in the longitudinal direction of the seal S. Such a seal S can be easily realized by a simple configuration such as using two dustproof seal members 50. Further, in this case, the installation of the two dustproof seal members 50 is extremely easy, and by accurately arranging the two dustproof seal members 50, it is possible to secure a stable airtightness.

Further, in the third aspect, one of the narrowest portion Ax, Ax1, is provided in the region including one of the two positions p1 and p2, which are the most separated from each other along the circumferential direction cd of the seal S, and has the widest width. The other Ax2 of the narrow portion Ax may be provided in the region including the other p2 of the two positions. In other words, one of the regions Ay1 in which two or more portions of the seal S overlap is provided in the region including one p3 of the two positions most separated along the circumferential direction cd of the seal S. The other Ay2 of the region Ay in which two or more portions overlap may be provided in the region including the other p4 at the two positions. According to such an example, it is possible to ensure excellent airtightness, for example, as described in the tenth example.

In the third aspect, the seal (seal component) S may have a single seal member 50 or may have a plurality of seal members 50. In the ninth example described later, the seal S has a single seal member 50. On the other hand, in the tenth example, the seal S has a plurality of dustproof seal members 50.

Hereinafter, a third aspect of the seal structure will be described with reference to a specific example. However, the following specific configuration is merely an example, and various changes can be made.

<9th example>
Next, a ninth example of the dustproof seal structure will be described mainly with reference to FIGS. 19 and 20. In the examples shown in FIGS. 19 and 20, the dust-proof seal member 50 is intended to improve the airtightness by significantly extending the dust entry path.

In the example shown in FIGS. 19 and 20, the dustproof seal member 50 is held by one of the fixed scroll 20 and the movable scroll 30 and abuts on the other of the fixed scroll 20 and the movable scroll 30. The dustproof seal member 50 has a linear shape and surrounds the working chamber 11 substantially two times in the illustrated example. As a result, the dustproof seal member 50 can seal the action chamber 11 between the fixed scroll 20 and the movable scroll 30.

The dustproof seal member 50 is arranged in a groove 25 formed in one of the fixed scroll 20 and the movable scroll 30. As shown in FIG. 19, the groove 25 can have a constant width along the circumferential cd. The dust-proof seal member 50 makes approximately two rounds in the groove 25, in other words, extends over approximately 720 ° in the width direction (diameter direction) rd in most regions along the circumferential direction cd of the groove 25. The two parts of the dustproof seal member 50 are lined up.

As shown in FIG. 20, the dustproof seal member 50 and the urging means 48 are arranged in the direction in which the fixed scroll 20 and the movable scroll 30 face each other (axial direction ad), and seal between the fixed scroll 20 and the movable scroll 30. If this is the case, the dust flowing into the working chamber 11 will pass between the two dustproof seal members 50 arranged in the radial direction. In the example shown in FIG. 19, the dust flowing into the working chamber 11 must move around the working chamber 11 substantially once between the two dustproof sealing members 50 arranged in the radial rd direction. .. Therefore, according to the dustproof seal member 50 that circulates around the working chamber 11 substantially twice, the fixed scroll 20 and the movable scroll 30 are stably sealed, and the inflow of dust and the like into the working chamber 11 is effectively prevented. can do.

In the example shown in FIG. 19, the dustproof seal member 50 extends around the working chamber 11 over an angle range θr1 of approximately 720 °. However, from the viewpoint of effectively preventing the inflow of dust and the like into the working chamber 11, the dustproof seal member 50 does not need to extend over such a large angle range θr1. For example, if the angle range θr1 in which the dustproof seal member 50 surrounds the periphery of the working chamber 11 is 405 ° (360 ° + 45 °) or more, the airtightness can be sufficiently improved. Further, from the viewpoint of improving the airtightness, the angle range θr1 is preferably 450 ° (360 ° + 90 °) or more, more preferably 540 ° (360 ° + 180 °) or more, and the figure. It is more preferably about 720 ° as shown in 19.

<10th example>
Next, a tenth example of the dustproof seal structure will be described mainly with reference to FIGS. 21 and 22. In the examples shown in FIGS. 21 and 22, similar to the ninth example, the dust-proof seal member 50 is intended to improve the airtightness by lengthening the dust entry path.

In the ninth example, the scroll type fluid machine 10 has a first dustproof seal member 50c and a second dustproof seal member 50d. That is, the dustproof seal S includes the first dustproof seal member 50c and the second dustproof seal member 50d. The first dustproof seal member 50c and the second dustproof seal member 50d are held by one of the fixed scroll 20 and the movable scroll 30 and come into contact with the other of the fixed scroll 20 and the movable scroll 30. The first dustproof seal member 50c surrounds the working chamber 11 at least partially. Further, the first dustproof seal member 50c at least partially surrounds the second dustproof seal member 50d. The second dust-proof seal member 50d and the first dust-proof seal member 50c surround the action chamber 11 from the entire circumference. As a result, the first dustproof seal member 50c and the second dustproof seal member 50d can seal the action chamber 11 between the fixed scroll 20 and the movable scroll 30.

The two dustproof seal members 50c and 50d are arranged in the groove 25 formed in one of the fixed scroll 20 and the movable scroll 30. As shown in FIGS. 21 and 22, the groove 25 can have a constant width along the circumferential cd. In the illustrated example, two dustproof seal members 50c and 50d are arranged in a single groove 25. In most of the regions along the circumferential cd of the groove 25, the two dustproof seal members 50 are arranged in the radial direction rd.

When the dustproof seal member 50 and the urging means 48 are arranged in the direction in which the fixed scroll 20 and the movable scroll 30 face each other (axial direction ad) and seal between the fixed scroll 20 and the movable scroll 30, the action chamber. The dust flowing into the 11 passes between both ends 58a and 58b of the first dustproof seal member 50c located on the outer side in the radial direction, and then both ends 59a of the second dustproof seal member 50d located on the inner side. , 59b must pass. Therefore, according to the two dustproof seal members 50c and 50d arranged around the working chamber 11, the fixed scroll 20 and the movable scroll 30 are stably sealed to allow dust and the like to flow into the working chamber 11. It can be effectively prevented.

In particular, in the example shown in FIGS. 21 and 22, the position pa between both ends 58a and 58b of the first dustproof seal member 50c is between both ends 59a and 59b of the second dustproof seal member 50d. It is located offset from the position pb in the circumferential direction cd. According to this example, the dust flowing into the working chamber 11 must move from the position pa to the position pb in the circumferential direction cd in the space between the two dustproof sealing members 50c and 50d. Therefore, according to the two dustproof sealing members 50c and 50d arranged around the working chamber 11, the fixed scroll 20 and the movable scroll 30 are more stably sealed, and dust and the like flow into the working chamber 11. Can be effectively prevented.

In the example shown in FIGS. 21 and 22, the position pa between both ends 58a and 58b of the first dustproof seal member 50c is between both ends 59a and 59b of the second dustproof seal member 50d. It is located approximately half a circumference, that is, approximately 180 ° in the circumferential direction cd from the position pb. Such a configuration is preferable in order to prevent the inflow of dust and the like into the working chamber 11. However, the deviation angle along the circumferential direction cd between the position pa between both ends 58a and 58b of the first dustproof seal member 50c and the position pb between both ends 59a and 59b of the second dustproof seal member 50d. When θs is 45 ° or more, the airtightness can be sufficiently improved, and when the angle θs is 90 ° or more, the airtightness can be improved more effectively.

Further, unlike the examples shown in FIGS. 21 and 22, the seal (seal component) S may include three or more dustproof seal members 50. For example, when the seal S includes three dustproof seal members 50, the position between both ends of each dustproof seal member 50 is set to be displaced in the circumferential direction cd at an angle of 90 ° or more and 150 ° or less. It may be possible, and it is more preferable to shift it in the circumferential direction cd at an angle of 120 °.

Further, in the example shown in FIG. 22, the end portion of the first dustproof seal member 50c and the end portion of the second dustproof seal member 50d have different configurations. These first dustproof seal member 50c and second dustproof seal member 50d each constitute the dustproof seal member 50 in the above-mentioned first aspect. The both end portions 58a and 58b of the first dustproof seal member 50c form a cut portion CU (joint portion 55) so as to overlap with the width direction (diameter direction) rd. Similarly, both end portions 59a and 59b of the second dustproof seal member 50d form a cut portion CU (joint portion 55) so as to overlap with the width direction (diameter direction) rd. At least one of the first dustproof seal member 50c and the second dustproof seal member 50d constitutes the dustproof seal member 50 according to the first aspect, and both ends of the at least one form a cut portion CU (joint portion 55). In addition, the first dustproof seal member 50c and the second dustproof seal member 50d have different end configurations, so that dust of various shapes can be dealt with. The airtightness can be further improved.

Further, in the example shown in FIG. 22, the first dustproof seal member 50c has an inner end portion (inner portion) 58a located inside in the width direction (diameter direction) rd and a width direction (diameter) of the inner end portion 58a. Direction) It has an outer end portion (outer portion) 58b located on the outer side in the rd. The inner end portion 58a is located on one side s1 in the circumferential direction cd with respect to the outer end portion 58b. The second dustproof seal member 50d has an inner end portion (inner portion) 59a located inside in the width direction (diameter direction) rd and an outer end portion located outside in the width direction (diameter direction) rd of the inner end portion 59a. (Outer portion) 59b and. The inner end portion 59a is located on the other side in the circumferential direction cd with respect to the outer end portion 59b. That is, the positions of the inner end portion and the outer end portion in the circumferential direction cd are reversed between the first dustproof seal member 50c and the second dustproof seal member 50d. According to such an example, the fluid passing through the abutment portion 55 of the first dustproof seal member 50c between the abutment portion 55 of the second dustproof seal member 50d, the second dustproof seal member 50d and the first dustproof seal member 50c , The direction of travel in the circumferential direction cd will be reversed on the way. Therefore, the airtightness of the first dustproof seal member 50c and the second dustproof seal member 50d can be further improved.

Although the present invention has been described above based on one embodiment, the present invention is not limited to these embodiments, and can be implemented in various other embodiments. Further, in the above-described embodiment, a plurality of specific examples have been described with reference to the drawings, but naturally, the configuration of all or a part of each example may be combined with all or one of one or more other examples. It is also possible to apply it in combination with the configuration of the unit as appropriate.

Further, the configuration of the dustproof seal member 50 described above can be similarly applied to the urging means 48. For example, the urging means 48 may be provided with a cutting portion and a joint portion, and the above-described configuration of the cutting portion CU and the joint portion 55 of the dustproof seal member 50 may be applied. By adopting the configuration of the dustproof seal member 50 described above for the urging means 48, it is possible to effectively prevent leakage in the urging means 48.

Claims (25)

The first scroll and the second scroll, which are relatively movable and face each other,
An annular dustproof seal that is placed in contact with each other between the first scroll and the second scroll, has a cut portion, and two portions forming the cut portion are in contact with each other in the width direction and overlap each other. With parts,
The width of the dustproof seal member at the overlapping portion of the two portions is equal to or less than the width of the other portions of the dustproof sealing member, and the two portions overlap in the width direction. A scrollable fluid machine that can move relative to each other. The dustproof seal member includes, as the two portions, an inner portion and an outer portion of the inner portion located outside in the width direction.
The outer side surface of the inner portion, which faces the outer side, is inclined and tapered with respect to the outer side surface at a portion adjacent to the inner portion of the dustproof seal member.
The outer side surface is tapered so that the inner side surface facing the inside thereof is inclined with respect to the inner side surface in the portion adjacent to the outer side portion of the dustproof seal member.
The scroll type fluid machine according to claim 1, wherein the outer side surface of the inner portion and the inner side surface of the outer portion come into contact with each other. One of the two portions has a concave portion formed by the annular dust-proof seal member in the circumferential direction.
The scroll type fluid machine according to claim 1, wherein the other of the two portions has a convex portion that protrudes in the circumferential direction and is inserted into the concave portion. The dustproof seal member includes, as the two portions, an inner portion and an outer portion of the inner portion located outside in the width direction.
The inner portion is located at a base portion narrower than the width of a portion adjacent to the inner portion of the dustproof seal member and a tip side of the base portion along the longitudinal direction of the dustproof seal member. It has a widened part that is wider than the part,
The outer portion is located at the base portion narrower than the width of the portion adjacent to the outer portion of the dustproof seal member and the tip side of the base portion along the longitudinal direction of the dustproof seal member. It has a widened part that is wider than the part,
The widened portion of the inner portion faces the base portion of the outer portion in the width direction.
The scroll type fluid machine according to claim 1, wherein the widened portion of the outer portion faces the base portion of the inner portion in the width direction. The scroll type fluid machine according to any one of claims 1 to 4, further comprising a pressing means for pressing one of the two portions toward the other. The scroll type fluid machine according to claim 5, wherein the pressing means presses one of them toward the other along the width direction. The scroll type fluid machine according to claim 5 or 6, wherein the pressing means includes an elastic member. The scroll type fluid machine according to claim 5 or 6, wherein the pressing means includes a fluid ejection mechanism. A circumferential groove is formed in one of the first scroll and the second scroll.
The dustproof seal member is arranged in the groove and
The scroll type fluid machine according to claim 8, wherein the fluid ejection mechanism ejects a fluid into the groove. A circumferential groove is formed in one of the first scroll and the second scroll, and the dustproof seal member is arranged in the groove.
The dustproof seal member includes, as the two portions, an inner portion and an outer portion of the inner portion located outside in the width direction.
The dustproof seal member includes at least one of an inner extending piece protruding inward from the inner side surface facing the inside of the inner portion and an outer extending piece protruding outward from the outer side surface facing the outside of the outer portion. The scroll type fluid machine according to any one of claims 1 to 9, wherein one is provided. The scroll-type fluid machine according to claim 10, wherein the inner extension piece is tapered inward and the outer extension piece is tapered outward. The inner extension piece includes a front end side surface and a base end side surface facing the dustproof seal member in the longitudinal direction.
In the observation from the direction in which the first scroll and the second scroll face each other, the angle formed by the front end side surface located on the tip end side in the longitudinal direction of the dustproof seal member with respect to the longitudinal direction is the base end side surface. Smaller than the angle made with respect to the longitudinal direction,
The outer extension piece includes a distal end side surface and a proximal end side surface facing the dustproof seal member in the longitudinal direction.
In the observation from the direction in which the first scroll and the second scroll face each other, the angle formed by the tip side surface located on the tip side in the longitudinal direction of the dustproof seal member with respect to the longitudinal direction is determined by the base end side surface. The scroll type fluid machine according to claim 11, which is smaller than the angle formed in the longitudinal direction. A circumferential groove is formed in one of the first scroll and the second scroll, and the dustproof seal member is arranged in the groove.
The scroll type fluid machine according to any one of claims 1 to 12, wherein a paste-like material is filled in at least between the two portions of the dustproof sealing member in the groove. The scroll type fluid machine according to any one of claims 1 to 13, further comprising a second dustproof seal member provided inside or outside the dustproof seal member. The first scroll and the second scroll, which are relatively movable and face each other,
An unsupported annular metal first seal located on one of the first scroll and the second scroll,
A scroll-type fluid machine provided on the first seal portion and comprising a second seal portion made of resin or rubber, which is an unsupported annular shape and is in contact with the other of the first scroll and the second scroll. A circumferential groove is formed in one of the first scroll and the second scroll, and the first seal portion and the second seal portion have the first scroll and the second scroll in the same groove. The scroll type fluid machine according to claim 15, which is arranged so as to be overlapped in the opposite direction. The scroll type fluid machine according to claim 15, wherein the second seal portion is a fluorine-based resin layer formed on the first seal portion. The scroll type fluid machine according to claim 16, wherein the width of the first seal portion in the direction in which the first scroll and the second scroll face each other is wider than the width of the second seal portion. The scroll according to claim 16 or 18, wherein the surface in contact with the first seal portion and the second seal portion is inclined with respect to the width direction in the direction in which the first scroll and the second scroll face each other. Formula fluid machine. The first scroll and the second scroll, which are relatively movable and face each other,
It is provided with an annular dustproof seal that is overlapped at one or more places in a state of being in contact with each other in the width direction so as to be in contact with the first scroll and the second scroll.
A scroll-type fluid machine in which the length of the narrowest portion of the dustproof seal is shorter than the length of the other portion of the dustproof seal. A single dustproof seal member is provided in the narrowest portion.
The scroll type fluid machine according to claim 20, wherein the narrowest portion is provided at two or more portions apart from each other in the circumferential direction of the dustproof seal. One of the narrowest portions is provided in a region containing one of the two most distant positions along the circumferential direction of the dustproof seal, and the other one of the narrowest portions is the two positions. The scroll type fluid machine according to claim 21, which is provided in an area including the other of the above. An annular sealing member that is relatively movable and comes into contact with each other between the first and second parts facing each other.
The two portions having the cut portion and forming the cut portion are in contact with each other in the width direction and overlap each other.
The width of the seal member at the cut portion is equal to or less than the width of the other portion of the seal member, and the seal is relatively movable in a state where the two portions forming the cut portion overlap each other. Element. An annular seal that is movable relative to each other and is placed between the first and second parts facing each other.
A non-bearing annular metal first seal portion that is to be placed on one of the first component and the second component.
A seal provided on the first seal portion and comprising a second seal portion made of resin or rubber with a non-bearing ring that comes into contact with the other of the first component and the second component. An annular seal that is movable relative to each other and is placed in contact with each other between the first and second parts facing each other.
The seals overlap at one or more places in contact with each other in the width direction.
The length of the narrowest part of the front seal is shorter than the rest of the seal, the seal.

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