JP7291256B2 - scroll fluid machinery and seals - Google Patents

Description

TECHNICAL FIELD The present invention relates to a scroll-type fluid machine having excellent durability. The invention also relates to sealing members and seals.

A scroll fluid machine having a fixed scroll and a movable scroll that oscillates relative to the fixed scroll is known, for example, as disclosed in JP7-208353A. In this scroll type fluid machine, a working chamber is defined between the fixed scroll and the movable scroll. The fixed scroll and movable scroll each have a spiral wrap projecting toward the working chamber. An inlet and an outlet are also provided to communicate the working chamber to the outside. As the orbiting scroll moves relative to the fixed scroll, fluid is compressed along the spiral flow path defined by the winding wraps. As a result, in the example shown in JP7-208353A, fluid is sucked in from the outer peripheral inlet and compressed fluid is discharged from the centrally located outlet.

In the scroll type fluid machine disclosed in JP7-208353A, negative pressure is generated in the working chamber during operation. In order to prevent outside air from flowing into the working chamber from between the fixed scroll and the movable scroll, the scroll fluid machine is provided with a dustproof seal. A linear dust seal is arranged with its ends radially overlapping to surround the working chamber. A dust-proof seal arranged in this manner provides a tight seal between the fixed scroll and the movable scroll.

However, when a conventional scroll type fluid machine is used in a harsh environment with a large amount of dust, etc., the life of the end seal member provided at the end of the spiral wrap is extremely shortened. After investigating the cause of this problem, it was found that in the conventional scroll type fluid machinery, a leak occurred at the abutment formed by radially overlapping both ends of the dust-proof seal member, causing dust and the like to flow into the working chamber. presumed to be More specifically, air passes between the ends of the dustproof seal member at the abutment and flows into the working chamber, and the dust that flows into the working chamber along with the air deteriorates the tip due to friction. was expected. The present invention is based on the findings of the inventors of the present invention, and effectively suppresses the deterioration of the tip seal material by effectively preventing the inflow of the external fluid into the scroll fluid machine. for the purpose. Another object of the present invention is to provide a seal and a seal member that can effectively prevent the inflow of external fluid.

Note that JP7-208353A proposes the adoption of a seamless endless annular dustproof sealing member. However, the temperature of the oil-free scroll type fluid machine rises during operation. As a result, the dust-proof sealing member causes meandering and twisting due to thermal deformation between the fixed scroll and the movable scroll, and leakage due to such deformation occurs. That is, the conventional scroll type fluid machine cannot sufficiently cope with the problem.

The scroll-type fluid machine according to the present invention, as the broadest concept, is capable of relative movement, and has a first scroll and a second scroll facing each other, and contact between the first scroll and the second scroll, respectively. and an annular dust-proof seal member arranged along the edge. This scroll type fluid machine may include one or more of the features described below.

A first scroll-type fluid machine according to the present invention includes:
a first scroll and a second scroll that are relatively movable and face each other;
an annular dust-proof sealing member disposed between the first scroll and the second scroll in contact with each other, and having a cut portion and two portions forming the cut portion overlapping in the width direction thereof; with
The width of the portion where the two portions of the dustproof seal member overlap is equal to or less than the width of the other portion of the dustproof seal member, and the two portions overlap in the width direction. and relative movement is possible.

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 located outside the inner portion in the width direction,
said inner portion has an outwardly facing outer side surface that tapers at an angle with respect to said outer side surface at a portion of said dustproof seal member adjacent said inner portion;
the outer portion has an inwardly facing inner side surface that tapers at an angle to the inner side surface at a portion of the dust-proof seal member adjacent to the outer portion;
The outer side surface of the inner portion and the inner side surface of the outer portion may be in contact.

In the first scroll type fluid machine according to the present invention,
one of the two portions has a recess recessed in the circumferential direction formed by the annular dustproof seal member;
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 located outside the inner portion in the width direction,
The inner portion includes a base portion narrower than the width of the portion adjacent to the inner portion of the dustproof seal member, and the base portion located on the distal end side of the base portion along the longitudinal direction of the dustproof seal member. and a widened portion wider than the portion,
The outer portion includes a base portion narrower than the width of the portion adjacent to the outer portion of the dustproof seal member, and the base portion located on the distal end side of the base portion along the longitudinal direction of the dustproof seal member. and a widened portion wider than the portion,
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 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 , a 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 disposed in the groove,
The dustproof seal member includes, as the two portions, an inner portion and an outer portion located outside the inner portion in the width direction,
The dustproof seal member has at least one of an inner extending piece projecting inward from an 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 extending piece may taper inward and the outer extending piece may taper outward.

In the first scroll type fluid machine according to the present invention,
the inner extending piece includes a distal side surface and a proximal side surface facing each other in the longitudinal direction of the dustproof seal member;
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 smaller than the angle formed with the longitudinal direction,
the outer extending piece includes a distal side surface and a proximal side surface facing each other in the longitudinal direction of the dustproof seal member;
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 It may be smaller than the angle formed with 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 disposed in the groove,
A paste-like material may be filled at least between the two portions of the dustproof sealing member in the groove.

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

A second scroll-type fluid machine according to the present invention includes:
a first scroll and a second scroll that are relatively movable and face each other;
a free annular metallic first seal disposed on one of the first scroll and the second scroll;
a resin or rubber-made second seal portion provided on the first seal portion and 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 formed in the same groove. In addition, the first scroll and the second scroll may be arranged so as to overlap each other in opposite directions.

In the second scroll-type fluid machine according to the present invention, the second seal portion may be a fluororesin 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 contact surfaces of the first seal portion and the second seal portion are inclined with respect to the width direction in the direction in which the first scroll and the second scroll face each other. may be

A third scroll-type fluid machine according to the present invention is
a first scroll and a second scroll that are relatively movable and face each other;
an annular dust-proof seal overlapping the first scroll and the second scroll at one or more locations while being in contact with the first scroll and the second scroll in the width direction thereof,
The length of the narrowest portion of the dust-proof seal is shorter than the other portions of the dust-proof seal.

In the third scroll type fluid machine according to the present invention,
The narrowest portion is provided with a single dustproof sealing member,
Two or more of the narrowest portions may be provided spaced apart in the circumferential direction of the dust 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 that are the most spaced apart along the circumferential direction of the dust seal, and the narrowest width is Another one of the narrowed portions may be provided in an area containing the other of the two locations.

A fourth scroll-type fluid machine according to the present invention is
a first scroll and a second scroll that are relatively movable and face each other;
an annular dust-proof seal disposed between the first scroll and the second scroll in contact with each other;
The annular dust-proof seal includes a region in which two or more portions thereof overlap in the width direction,
The length of the area where the two or more portions of the dust-proof seal overlap is longer than the length of other areas.

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 separately in the longitudinal direction of the dust seal.

In the fourth scroll type fluid machine according to the present invention, one of the regions where the two or more portions overlap is provided in a region including one of two positions that are the most separated in the circumferential direction of the dust seal, Another one of the regions where the two or more portions overlap may be provided in a region containing the other of the two positions.

A fifth scroll-type fluid machine according to the present invention is
a first scroll and a second scroll that are relatively movable and face each other;
an annular dust-proof sealing member disposed between the first scroll and the second scroll in contact with each other, and having a cut portion and two portions forming the cut portion overlapping in the width direction thereof;
pressing means for pressing one of the two portions toward the other.

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

A seventh scroll-type fluid machine according to the present invention is
a first scroll and a second scroll that are relatively movable and face each other;
an annular dust-proof sealing member disposed between the first scroll and the second scroll in contact with each other, and having a cut portion and two portions forming the cut portion overlapping in the width direction thereof; with
A circumferential groove is formed in one of the first scroll and the second scroll, and the dustproof seal member is disposed in the groove,
The dustproof seal member includes, as the two portions, an inner portion and an outer portion located outside the inner portion in the width direction,
The dustproof seal member has at least one of an inner extending piece projecting inward from an 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.

A first sealing member according to the present invention comprises:
An annular sealing member that is arranged between first and second parts that are movable relative to each other and are in contact with each other,
two parts having a cut and forming the cut are in contact and overlapped in the width direction thereof;
The width of the cut portion of the dust-proof seal member 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 are relatively movable in an overlapping state. .

A second sealing member according to the present invention comprises:
An annular sealing member that is arranged between first and second parts that are movable relative to each other and are in contact with each other,
It has a free annular, metallic annular body.

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

A second seal according to the invention comprises:
An annular seal adapted to be disposed between first and second parts movable relative to each other and facing each other, comprising:
a free annular metallic first seal adapted to be disposed on one of said first part and said second part;
a second resin or rubber non-supporting annular seal portion provided on the first seal portion and in contact with the other of the first component and the second component;

A third seal according to the invention comprises:
between a first part and a second part that are movable relative to each other and face each other;
The length of the narrowest portion of the front seal is shorter than the remainder of said seal.

A fourth seal according to the invention comprises:
An annular seal adapted to be disposed between first and second parts that are movable relative to each other and in contact with each other, the seal comprising:
Including an area in which two or more parts are arranged so as to overlap in the width direction,
The length of the region where the two or more portions overlap is longer than the length of other regions.

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

FIG. 1 is a diagram for explaining an embodiment of the present invention, and is a longitudinal sectional view showing a scroll fluid machine. FIG. 2 is an exploded perspective view showing a fixed scroll, a dustproof seal member, and biasing means included in the scroll fluid machine shown in FIG. 3 is a partially enlarged view of FIG. 1. FIG. FIG. 4 is a diagram for explaining the 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 along line VIII-VIII of FIG. FIG. 9 is a cross-sectional view corresponding to FIG. 8 and for explaining a modification 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. 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 a dustproof seal member. 14 is a cross-sectional view taken along line XIV-XIV in FIG. 13. 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. 16 is a cross-sectional view taken along line XVI--XVI of FIG. 15. FIG. FIG. 17 is a diagram for explaining a modified example of the eighth example in a section similar to that of FIG. FIG. 18 is a diagram for explaining another modification of the eighth example in a cross section similar to 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. 20 is a cross-sectional view taken along line XX-XX of FIG. 19. FIG. FIG. 21 is a diagram for explaining a tenth example of the 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 a dustproof seal member.

An embodiment of the present invention will be described below with reference to the drawings. In addition, in the drawings attached to this specification, for the convenience of illustration and ease of understanding, the scale and the ratio of vertical and horizontal dimensions are appropriately changed and exaggerated from those of the real thing.

1 to 22 are diagrams for explaining an embodiment according to the present invention. 1 to 3 are diagrams for explaining the overall configuration of the scroll fluid machine. 4 to 22 are diagrams for explaining some examples of the dustproof seal structure.

As shown in FIG. 1, the scroll fluid machine 10 includes a case 15, a first scroll 20, a second scroll 30, and a drive mechanism 40 as main components. In the illustrated example, the first scroll is configured as a fixed scroll 20 and fixed to the case 15 via fasteners 13 . The second scroll is configured as a movable scroll 30 and arranged within the space formed by the case 15 and the fixed scroll 20 . However, without being limited to this example, the first scroll may be configured as the movable scroll 30 and the second scroll may be configured as the fixed scroll 20 .

The movable scroll 30 faces the fixed scroll 20 in the axial direction ad defined by the drive mechanism 40 . A working chamber 11 is formed between the fixed scroll 20 and the movable scroll 30 . In this scroll-type fluid machine 10 , the movable scroll 30 moves relative to the fixed scroll 20 , so that the fluid in the working chamber 11 can be acted upon. A seal (seal component) S is arranged between the fixed scroll 20 and the orbiting scroll 30 to form a sealing structure in order to seal the space between the fixed scroll 20 and the orbiting scroll 30 and partition the working chamber 11 from the outside. ing.

In one embodiment described below, a contrivance is made to effectively prevent leakage in the seal structure, in other words, to improve the sealing performance of the seal structure. According to this scroll type fluid machine 10, it is possible to effectively prevent not only the fluid but also dust from flowing into the working chamber 11 together with the fluid. As a result, it is possible to effectively suppress the deterioration of the structure inside the working chamber 11, reduce the frequency of inspection and maintenance of the scroll fluid machine 10 even when used in a bad environment with a lot of dust, etc. makes it possible to extend the life of the scroll fluid machine 10 . In particular, such effects are particularly useful for oil-free scroll fluid machines that are not expected to be overhauled for a long period of time.

It should be noted that the seal structure provided with the seal (seal component) S described below is not limited to the scroll type fluid machine, and can be applied to various types including a first component and a second component that are relatively movable and face each other. Suitable for instruments or devices. For example, the relative movement of the first part and the second part can be various movements, for example, it may be a pivoting movement, a translational movement, or a reciprocating movement. good. Moreover, the seal structure provided with the seal S can be used not only for dust-proof applications but also for liquid-proof applications against oil and water.

First, the overall configuration of the scroll fluid machine 10 other than the dustproof seal structure will be described, and then several 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 disc-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 ad of the scroll fluid machine 10 . The annular wall portion 22 of the fixed scroll 20 is fixed to the case 15 using fasteners 13 . As shown in FIG. 2, the annular wall portion 22 is formed with a circumferential (particularly circumferential) groove 25 . An urging means 48 and a sealing member 50, which will be described later, are arranged in the groove 25. As shown in FIG.

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

As shown in FIG. 1, the base plate portion 21 is provided with through holes. The through hole forms an inlet 11a and an outlet 11b that communicate the working chamber 11 with the outside. In the illustrated example, the inlet 11a is formed at the outer periphery along the spiral path of the fixing wrap 23 and the outlet 11b is formed at the center along the spiral path of the fixing wrap 23. As shown in FIG. Furthermore, as shown in FIG. 1, a heat radiating fin 24 is provided on the side of the base plate portion 21 opposite to the side on which the fixing 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 wrap 33 is formed on the side of the base plate portion 31 facing the fixed scroll 20 . The movable wrap 33 is a wall portion erected along a spiral path when viewed from the axial direction ad of the scroll fluid machine 10 , and has a configuration complementary to the fixed wrap 23 . The movable wrap 33 extends from the base plate portion 31 toward the fixed scroll 20 in the axial direction ad of the scroll fluid machine 10 . A tip sealing material 33 a is provided at the tip of the movable wrap 33 . The tip seal material 33 a contacts the fixed scroll 20 . The tip seal material 33 a seals between the movable wrap 33 and the fixed scroll 20 . As shown in FIG. 1, a 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 wrap 33 is provided.

The drive mechanism 40 is a mechanism that causes the movable scroll 30 to move relative to the fixed scroll 20 . In the present embodiment, the drive mechanism 40 causes the movable scroll 30 to oscillate relative to the fixed scroll 20 in a plane orthogonal to the axial direction ad of the scroll fluid machine 10 . The orbiting scroll 30 is driven by the drive mechanism 40 to translate relative 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 that converts the rotational motion output from the electric motor 41 into translational motion along a circumferential orbit. The conversion mechanism can employ various known configurations, such as the configuration disclosed in the above-mentioned patent document (JP7-208353A). In the example shown in FIG. 1 , the conversion mechanism 42 has a crankshaft 43 that is rotationally driven by the electric motor 41 and a bearing 44 that is fixed within the connecting boss 35 of the movable scroll 30 . The crankshaft 43 includes a first shaft portion 43a arranged on the rotation axis ra of the electric motor 41 and rotationally driven by the electric motor 41, and a second shaft portion 43b defining an eccentric axis ea eccentric from the rotation axis ra. have. The second shaft portion 43 b is held by the bearing 44 . When the first shaft portion 43a is rotationally driven, the second shaft portion 43b moves on a circular orbit centered on the rotation axis ra. Matches the amount of eccentricity. At this time, the movable scroll 30 can rotate around 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 rotation of the movable scroll 30 with respect to the fixed scroll 20, such as a crankshaft, may be provided separately.

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

Among the components described above, the case 15, the fixed scroll 20 and the movable scroll 30 are made of metal having high strength and excellent heat resistance. Aluminum alloys, among other metals, have advantages such as light weight and excellent heat dissipation.

In the scroll-type fluid machine 10 configured as described above, when the orbiting scroll 30 is rotated with respect to the fixed scroll 20 by the drive mechanism 40 , the fixed wrap 23 and the movable wrap 33 move in the working chamber 11 . Repeat approach and separation at each region along the spiral path of . As a result, the fluid, which is the internal medium, is compressed or expanded along the spiral path of the fixing wrap 23 in the working chamber 11 . In the illustrated example, air is compressed along the spiral path of the fixed wrap 23 from the outer periphery toward the center. At the central portion along the spiral path of the fixed wrap 23, air with increased pressure is obtained and supplied to the outside from the outlet 11b. Along with this, air is sucked from the inlet 11a positioned at the outer peripheral portion along the spiral path of the fixing wrap 23 . That is, in the illustrated example, the scroll fluid machine 10 functions as a compressor.

During operation of the scroll fluid machine 10, in order to cope with heat generated by air compression and heat generated by friction in the working chamber 11 between the movable scroll 30 and the fixed scroll 20, the fixed scroll 20 and the movable scroll 30 are: It has radiation fins 24 and 34 . A cooling device (not shown) supplies a cooling medium to the radiating fins 24 and 34 to exchange heat with the radiating fins 24 and 34 . As an example, the cooling device is configured as a blower to blow air onto the heat radiating fins 24,34.

By the way, scroll type fluid machines functioning as compressors are used in various fields such as train cars and vehicles such as automobiles. However, when a conventional scroll fluid machine is used in a harsh environment with a lot of dust, etc., the end seal material (also called tip seal) provided at the end of the wrap has a problem of extremely shortened life. . A major advantage of the scroll fluid machine is that it does not require lubrication and requires no maintenance for a certain period of time. Therefore, deterioration of the tip seal material in use in a severe environment is a serious defect of the scroll fluid machinery, and is a reason for hindering the widespread use of the scroll fluid machinery. In order to deal with such problems, the scroll 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 mainly with reference to the first to sixth examples, the second aspect of the seal structure will be described mainly with reference to the seventh and eighth examples, and the A third aspect of the seal structure will be described mainly with reference to the ninth and tenth examples. In the following example, the seal member 50 that forms the seal S exerts a dustproof function as a dustproof seal member when applied to the scroll 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 arranged in contact with each other between the first part 20 and the second part 30 that are relatively movable and face each other. 50 included. The dustproof seal member 50 has a cut portion CU, and two portions 51 and 52 forming the cut portion CU are overlapped in the width direction of the dustproof seal member 50 . The dustproof seal member 50 can 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 ad and the longitudinal direction of the dustproof seal member 50, and in the example described below, coincides with the later-described radial direction rd. Therefore, in the following description, the same reference numeral "rd" is used for the width direction as for the radial direction.

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

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, further in other words, the two portions located on both sides of the cut portion CU. 51 and 52 are relatively movable while overlapping in the width direction. Therefore, as will be described later, when the total length of the dustproof seal member 50 is increased due to thermal expansion, the two portions 51 and 52 can move in the longitudinal direction. At this time, by maintaining the state in which the two portions 51 and 52 overlap in the width direction, it is possible to maintain the sealing function at the cut portion CU and effectively prevent leakage at the cut portion CU. As a result, it is possible to effectively prevent dust from entering the working chamber 11, and to effectively avoid unexpected early deterioration of the end seal members 23a, 33a of the fixed wrap 23 and the movable wrap 33. can.

The two portions 51 and 52 forming the cut portion CU are preferably movable relative to each other within a range in which they are kept overlapping in the width direction rd. That is, the two portions 51 and 52 forming the cut portion CU are preferably maintained in a state of being overlapped in the width direction rd without relying on their relative movement. In this case, it is possible to stably and effectively prevent leakage at the cut portion CU. When the relative movement of the two portions 51 and 52 forming the cut portion CU occurs due to the thermal expansion of the seal member 50, the seal member of the scroll fluid machine 10 or the like may be used before the temperature of the seal member 50 is increased. The length of the sealing member 50 may be set so that the two portions 51 and 52 forming the cut portion CU are overlapped in the width direction rd even before the operation of the device or device including the sealing member 50 . Further, in the example shown in FIG. 6, which will be referred to later, structurally, the two portions 51 and 52 forming the cut portion CU are relatively movable within a range where they are kept overlapping 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 the same as or smaller than the width of the other portions of the dustproof seal member 50 . That is, in the area where the cut portion CU is provided, the two portions 51 and 52 of the dustproof seal member 50 overlap in the width direction rd, but the width does not increase. Accordingly, installation of the seal member 50, for example, installation of the seal member 50 in the groove 25 as described later, can be made easy and accurate. Also, 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.

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

Although the seal S has a single seal member 50 in the following specific example, the seal S may include a plurality of seal members 50 as in a tenth example described later. By including a plurality of dustproof seal members 50, particularly by installing a plurality of dustproof seal members 50 by changing the positions of the cut portions CU in the circumferential direction cd, the airtightness can be remarkably improved.

A joint portion 55 is formed between both end portions 51 and 52 of the linear dustproof seal member 50 . In these examples, the cut portion CU is formed in the abutment portion 55 . That is, in the following example, the portions forming the cut portion CU are the end portions 51 and 52 of the dustproof seal member 50 . However, the following specific configuration is merely an example, and various modifications are possible.

<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 fluid machine 10, the fixed scroll 20 is formed with grooves 25 (see FIG. 2). The groove 25 is arranged so as to surround the working chamber 11 . Further, the groove 25 is provided in a region that always faces the peripheral edge of the orbiting scroll 30 regardless of the relative position of the orbiting scroll 30 with respect to the fixed scroll 20 . However, the groove 25 may be provided in the orbiting scroll 30 without being limited to such an example. Also, in the illustrated example, the groove 25 has a constant width in the radial direction. However, the width of the groove 25 may vary without being limited to this example.

By making the width of the groove 25 constant, the formation of the groove can be facilitated. In addition, it is possible to facilitate the placement of the seal member 50 having the cut portion CU in the groove 25 as described later.

In this specification, the direction along the circumferential locus surrounding the working chamber 11 is referred to as the circumferential direction cd. A direction perpendicular to both the axial direction ad and the circumferential direction cd is called a radial direction rd. In the illustrated example, the longitudinal direction of the dustproof seal member 50 incorporated in the scroll fluid machine 10 matches the circumferential direction cd, and the width direction of the dustproof seal member 50 matches the radial direction rd. The “inner” side in the width direction rd and the radial direction rd is the inner side of the circumference defined by the circumferential direction cd and the side closer to the rotation axis ra in the scroll fluid machine 10 . The “outer” side in the width direction rd and the radial direction rd is the outer side of the circumference defined by the circumferential direction cd and the side farther from the rotation axis ra of the scroll fluid machine 10 .

As shown in FIGS. 2 and 3, the groove 25 is provided with an urging means 48 and a dustproof seal member 50 . The biasing means 48 presses the dustproof seal member 50 in the axial direction ad to bias the fixed scroll 20 to contact the movable scroll 30 . The biasing means 48 may be constructed by an elastic member. In the illustrated example, the biasing means 48 are made of annular rubber. However, the present invention is not limited to this example, and the biasing means 48 may be distributed in the circumferential direction cd. As shown in FIG. 3, the biasing means 48 and the dustproof seal member 50 seal the fixed scroll 20 and movable scroll 30 in the axial direction ad.

The dustproof seal member 50 is a member that contacts the movable scroll 30 and fills the gap between the fixed scroll 20 and the movable scroll 30 . Therefore, a material having friction resistance and sealing properties, such as rubber or resin, can be selected as the material for the dustproof seal member 50 .

In the first example of the dustproof seal structure shown in FIGS. 2 to 4, the shape of the dustproof seal member 50 improves the airtightness of the dustproof seal structure. First, as shown in FIG. 2, the dustproof seal member 50 is configured as a linear member. As shown in FIG. 4, both end portions 51 and 52 of the dustproof seal member 50 are overlapped in a radial direction (width direction of the dustproof seal member 50) rd perpendicular to the circumferential direction (longitudinal direction of the dustproof seal member 50) cd. , and a cut portion CU is formed between both ends 51 and 52 . However, both end portions 51 and 52 overlap in the width direction rd, and an abutment portion 55 is formed by this overlap. The dustproof seal member 50 surrounds the working chamber 11 from its entire periphery. The dustproof seal member 50 takes in the working chamber 11 and seals between the fixed scroll 20 and the movable scroll 30 . 4 and FIGS. 5 to 22, which will be described later, illustration of the working chamber 11, the fixing wrap 23, and the like is omitted.

As shown in FIG. 4, particularly in the first example, the linear dustproof seal member 50 has inner end portions (inner portions) positioned relatively inside in the width direction rd as both end portions forming the abutment portion 55. 51 and an outer end (outer portion) 52 located relatively outside in the width direction rd. That is, the outer end portion 52 is located outside the inner end portion 51 in the radial direction rd. 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 width in the width direction rd at the portion where both ends 51 and 52 of the dustproof seal member 50 overlap is equal to or less than the width in the width direction rd at other portions of the dustproof seal member. 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 installation of the seal S formed by such a dust-proof seal member 50, especially the arrangement in the groove 25, can be performed very 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 rd, which is opposed to an outer side surface 53b at a portion 53 adjacent to the inner end portion 51 of the dustproof seal member 50. is sloping. Further, the inner side surface 51 a of the inner end portion 51 facing inward in the radial direction rd is positioned on the same line as the inner side surface 53 a of the portion 53 adjacent to the inner end portion 51 of the dustproof seal member 50 .

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

When such a dust-proof seal member 50 was used, it was possible to effectively prevent dust from flowing into the working chamber 11 together with outside air leaked from the dust-proof seal structure. As a result of extensive studies by the inventors of the present invention, one of the main causes of early deterioration of the tip seals 23a and 33a is heat dissipation into the working chamber 11, which becomes negative pressure during operation of the scroll fluid machine 10. It has been confirmed that this is a partial inflow of cooling air directed to the fins 24,34. According to the dust-proof seal member 50 shown in FIG. 4, during the operation of the scroll fluid machine 10 whose dust-proof seal structure is required to have airtightness, leakage at the abutment portion 55 (cut portion CU) can be effectively prevented. can be prevented.

During operation of the scroll fluid machine 10, air is compressed in the working chamber 11 between the fixed scroll 20 and the orbiting scroll 30 to heat and expand the dust-proof sealing member 50 that contacts the fixed scroll 20 and the orbiting scroll 30. The material of the dustproof seal member 50 that requires hermeticity and friction resistance usually has a higher coefficient of linear expansion than the material used for the scrolls 20 and 30 . In addition, the dustproof seal member 50 has an elongated shape and is easily expandable in the longitudinal direction due to its shape. Therefore, the dustproof seal member 50 expands during operation of the scroll fluid machine 10 . As a result, as indicated by arrows 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 51 a of the inner end portion 51 is pressed against the inner wall of the groove 25 by a wedge effect utilizing the inclination of the inner side surface 52 a 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 a 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 (cut portion CU), effectively preventing fluid (outside air) from flowing between the end portions 51. can be prevented.

Furthermore, according to such a configuration, the width of the dustproof seal member 50 at the cut portion CU is less than or equal to the width of the dustproof seal member 50 at other portions. 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 stabilized in the groove 25, and furthermore, 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 kept in contact with each other. Also from this point, leakage at the abutment portion 55 can be prevented more effectively.

In the first example described above, the dustproof seal member 50 is a linear member that is held by one of the fixed scroll 20 and the movable scroll 30 and contacts the other of the fixed scroll 20 and the movable scroll 30 . The dustproof seal member 50 surrounds the working chamber 11 by forming an abutment portion 55 so that both end portions 51 and 52 overlap in a radial direction rd perpendicular to the circumferential direction cd. An inner end portion 51 of both ends forming the abutment portion 55 has an outer side surface 51b that is tapered with respect to an outer side surface 53b at a portion 53 adjacent to the inner end portion of the dustproof seal member 50. there is The inner side surface 52a of the outer end portion 52 of the both ends 51 and 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 tapering off. Then, the outer side surface 51b of the inner end portion 51 and the inner side surface 52a of the outer end portion 52 are in contact with each other. According to such a first example, leakage at the abutment portion 55 can be effectively prevented. As a result, it is possible to effectively prevent dust from entering the working chamber 11, and to effectively avoid unexpected early deterioration of the end seal members 23a, 33a of the fixed wrap 23 and the movable wrap 33. can.

<Second example>
Next, mainly with reference to FIG. 5, a second example of the dust-proof seal structure that makes it possible to effectively prevent leakage at the abutment will be described. In the description of the second example and the subsequent description of further examples, differences from the dustproof seal structure described as another example will mainly be described, and other points will be described in other examples. It can be configured in the same manner as the dustproof seal structure described as an example. Also, in the discussion of the second example, and in the discussion of further examples that follow, and in FIGS. The same reference numerals as those used for the corresponding configurations in other examples are given to the parts that can be performed, and overlapping explanations are omitted.

In the example shown in FIG. 5, as in the first example, due to the shape of portions 51 and 52 (both ends of the dustproof seal member 50) forming the cut portion CU, the cut portion CU (abutment portion 55) is to prevent leaks. In the example shown in FIG. 5 as well, both end portions 51 and 52 of the dustproof seal member 50 forming the cut portion CU overlap each other in the width direction (radial direction) rd to form an 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 the end portions 51 and 52 . The intermediate portion 53 may have a constant width. One end portion (one portion forming the cut portion CU) 51 of the dustproof seal member 50 has a concave portion 51c recessed in the circumferential direction cd on the end face. The other end portion (the other portion forming the cut portion CU) of the dustproof seal member 50 has, on its end surface, a convex portion 52c 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 the ends 51 and 52 forming the cut portion CU and leaks from the abutment portion 55 (cut portion CU) You need to go twice as deep as you go in. Moreover, the fluid leaking from the abutment portion 55 needs to turn back in the opposite direction in the traveling direction along the circumferential direction cd in the recessed portion 51c. As a result, the space between the fixed scroll 20 and the movable scroll 30 can be effectively sealed, and leakage at the abutment portion 55 can be effectively prevented. As a result, it is possible to effectively prevent dust from entering the working chamber 11, and to effectively avoid unexpected early deterioration of the tip seal members 23a and 33a of the fixed wrap 23 and the movable wrap 33. can.

Furthermore, in the second example, the portions 51 and 52 forming the cut portion CU are relatively movable in the circumferential direction cd while maintaining their overlap in the width direction rd. That is, the dustproof seal member 50 can thermally expand and contract within the groove 25 while maintaining a constant width. Therefore, it is not necessary to change the width of the grooves 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 furthermore, the state in which the convex portion 52c of the other end portion 52 enters the concave portion 51c of the one end portion 51 can be maintained. can be done. Also from this point, leakage at the abutment portion 55 (cut portion CU) can be more effectively prevented.

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 provided as shown in FIG. The recess 51c shown in FIG. 5 is formed and the protrusion 52c shown in FIG. may

<Third example>
Next, mainly with reference to FIG. 6, a third example of the dust-proof seal structure that makes it possible to effectively prevent leakage at the abutment will be described. In the example shown in FIG. 6, as in the first example and the second example, the shape of the portions (both ends of the dustproof seal member 50) 51 and 52 forming the cut portion CU causes It is designed to prevent leaks. In the example shown in FIG. 6 as well, both end portions 51 and 52 of the dustproof seal member 50 overlap each other in the width direction rd to form an abutment portion 55 . As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape.

As shown in FIG. 6, particularly in the third example, the linear dustproof seal member 50 has inner ends (inner portions) positioned relatively inside in the radial direction rd as both ends forming the abutment portion 55. 51 and an outer end (outer portion) 52 located relatively outside in the radial direction rd. That is, the outer end portion 52 is located outside the inner end portion 51 in the width direction rd. 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 constant width.

The inner end portion (inner portion) 51 includes a base portion 51d narrower than the width wm of the portion 53 adjacent to the inner end portion 51 of the dustproof seal member 50, and a longitudinal direction (circumferential direction cd) of the dustproof seal member 50. and a widened portion 51e that is located on the distal end side of the base portion 51d along the direction to which the base portion 51d extends and is wider than the base portion 51d. Similarly, the outer end portion (outer portion) 52 includes 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 a base portion 52d along the longitudinal direction of the dustproof seal member 50. and a widened portion 52e located on the distal end side of the base portion 52d and wider than the base portion 52d. The widened 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 widened 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 the third example, the fluid that flows between the ends 51 and 52 forming the cut portion CU and leaks from the abutment portion 55 (cut portion CU) flows through the widened portion 51e of the inner end portion 51 and It is necessary to pass through two of the gap between the outer end portion 52 and the base portion 52d and the gap between the widened portion 52e of the outer end portion 52 and the base portion 51d of the inner end portion 51 . Furthermore, it is possible to secure a relatively long length in which both ends 51 and 52 are arranged in parallel in the circumferential direction cd. These can effectively prevent leakage at the abutment portion 55 . As a result, it is possible to effectively prevent dust from entering the working chamber 11, and to effectively avoid unexpected early deterioration of the tip seal members 23a and 33a of the fixed wrap 23 and the movable wrap 33. can.

Furthermore, in the third example, the portions 51 and 52 that form the cut portion CU are relatively movable in the circumferential direction cd while maintaining overlap in the width direction rd. That is, the dustproof seal member 50 can thermally expand and contract within the groove 25 while maintaining a constant width. Therefore, it is not necessary to change the width of the grooves 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 furthermore, the state in which the convex portion 52c of the other end portion 52 enters the concave portion 51c of the one end portion 51 can be maintained. can be done. Also from this point, leakage at the abutment portion 55 (cut portion CU) can be more effectively prevented.

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 It may be equal to or greater than the width wm of the intermediate portion 53 adjacent to the outer edge 52 . According to this configuration, the widened portion 51e of the inner end portion 51 and the base of the outer end portion 52 can be adjusted without restraining the relative movement of the dustproof seal member 50 to the both end portions 51 and 52 due to thermal expansion or thermal contraction more than necessary. Leakage in the gap with the portion 52d can be effectively prevented. Similarly, the sum of the width w2e of the widened portion 52e of the outer end (inner portion) 52 and the width w1d of the base portion 51d of the inner end (inner portion) 51 is adjacent to the inner end 51 of the dustproof seal member 50. It may be the same as or larger than the width wm of the portion 53 where it is located. According to this configuration, the widened portion 52e of the outer end portion 52 and the base of the inner end portion 51 can be adjusted without restraining the relative movement of the dustproof seal member 50 to the both end portions 51 and 52 due to thermal expansion or thermal contraction more than necessary. Leakage in the gap with the portion 51d can be effectively prevented.

<Fourth example>
Next, mainly referring to FIGS. 7 to 9, a fourth example of the dustproof seal structure that can effectively prevent leakage at the abutment will be described. In the examples shown in FIGS. 7 to 9, there is no restriction on the shape of the portions 51 and 52 forming the cut portion CU (both ends forming the abutment portion), and cutting is performed by applying an external force to the abutment portion. This is intended to prevent leakage at the CU (abutment).

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 an abutment portion 55. As shown in FIGS. 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 includes pressing means 60 for pressing one portion forming the cutting portion CU toward the other portion. In other words, scroll fluid machine 10 further includes pressing means 60 for pressing one end portion 51 forming abutment portion 55 of dustproof seal member 50 toward the other end portion 52 .

The pressing means 60 presses the one portion 51 forming the cut portion CU toward the other portion 52 in the width direction (radial direction) rd, and presses the other portion 52 toward the one portion 51 in the width direction. (Radial direction) You may make it press to rd. Alternatively, the pressing means 60 presses the one portion 51 inwardly or outwardly in the width direction (radial direction) rd toward the other portion 52 supported by the wall portion defining the groove 25, thereby closing the groove 25. The portions 51 and 52 forming the cut portion CU may be brought into contact with each other between the partitioning wall portions.

In the examples of FIGS. 7 and 8 , the scroll fluid machine 10 has first pressing means 61 and second pressing means 62 . The first pressing means 61 presses the inner end portion (inner portion) 51 outward in the radial direction rd to bias 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 rd 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 groove 25 in the radial direction rd, and a second pressing means 61 at a position outside the groove 25 in the radial direction rd. A receiving portion 26 is formed for receiving means 62 . Each of the pressing means 61 and 62 has plate members 61a and 62a and elastic members 61b and 62b stored in the housing 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 by the elastic members 61b and 62b. The elastic members 61 b and 62 b press the corresponding plate members 61 a and 62 a toward the abutment portion 55 of the dustproof seal member 50 accommodated in the groove 25 . In particular, the illustrated pressing means 61 and 62 are adapted to press one end toward the other end along the radial direction rd. In the illustrated example, the elastic members 61b and 62b are made of compression springs, but are not limited to this example, and may be made of rubber tubes or the like.

7 and 8, one of the first pressing means 61 and the second pressing means 62 can be omitted.

Also, in the example shown in FIG. 7, the dustproof seal member 50 has both end portions 51 and 52 that form an abutment portion 55 (cutting portion CU) and has the same configuration as the dustproof seal member described in the first example. Although an example having a configuration has been shown, it is not limited to this. The pressing means 60 can be applied to various forms of the dustproof seal member 50, for example, the dustproof seal member 50 described as the second example or the third example.

Furthermore, 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. As shown in FIG. The fluid ejection mechanism 63 is a mechanism capable of ejecting fluid made of gas or liquid, and has a fluid source 63a and an orifice 63b through which the fluid supplied from the fluid source 63a passes. A jet port 27 is formed in the bottom surface of the groove 25 in the fixed scroll 20 . The fluid that has passed through the orifice 63b is ejected into the groove 25 through the ejection port 27. As shown in FIG. In the illustrated example, the ejection port 27 is formed on one side of the bottom surface of the groove 25 in the radial direction rd. Therefore, the pressure inside the groove 25 is higher on one side in the radial direction rd and lower on the other side in the radial direction rd. As a result, one end located on one side in the radial direction rd is pressed toward the other end located on the other side in the radial direction rd.

In the fourth example as described above, the dustproof seal member 50 is a linear dustproof seal member that is held by one of the fixed scroll 20 and the movable scroll 30 and contacts the other of the fixed scroll 20 and the movable scroll 30 . The dustproof seal member 50 forms an abutment portion 55 so that two portions (both end portions) 51 and 52 forming the cut portion CU overlap in the width direction (radial direction) rd perpendicular to the circumferential direction cd. surround the The scroll fluid machine 10 further includes pressing means 60 for pressing one end of the dustproof seal member 50 toward the other end. Using the pressing means 60, one portion forming the cut portion CU (one end of the dustproof seal member 50) is pressed toward the other portion (the other end), thereby forming the cut portion CU (abutment 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 (abutment portion 55). As a result, it is possible to effectively prevent dust from entering the working chamber 11, and to effectively avoid unexpected early deterioration of the tip seal members 23a and 33a of the fixed wrap 23 and the movable wrap 33. can.

In the examples shown in FIGS. 7 and 8, the pressing means moves one portion (end portion) forming the cut portion CU along the width direction (radial direction) rd to the other portion (end portion). press towards. With such a pressing means, one portion (end portion) can be maintained in a state of stably contacting the other portion (end portion), thereby preventing leakage at the abutment portion 55. can be prevented more effectively.

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

On the other hand, in the example shown in FIG. 9, the pressing means 60 includes a fluid ejection mechanism 63. As shown in FIG. By using the fluid ejected from the fluid ejecting mechanism 63, one portion (end portion) forming the cutting portion CU is pressed toward the other portion (end portion) along the radial direction rd, and the one portion (end portion) can be maintained in a state of stably contacting the other portion (end portion), thereby more effectively preventing leakage at the abutment portion 55 . Further, similarly to the dustproof seal member 50, the biasing means 48 is also pressed along the width direction (radial direction) rd. The annular biasing means 48 having a hollow circular cross section is pressed in the radial direction rd by the fluid from the fluid jetting mechanism 63 and deforms so as to expand along the axial direction ad. As a result, the dust-proof seal member 50 and the movable scroll 30, the dust-proof seal member 50 and the urging means 48, and the urging means 48 and the groove 25 are brought into close contact with each other, so that the fixed scroll 20 and the movable scroll 30 can be more stably sealed. In addition, by adjusting the ejection amount, ejection speed, ejection pressure, etc. of the fluid ejection mechanism 63, the force pressing one portion (end portion) forming the cutting portion CU against the other portion (end portion) can be reduced. can be adjusted. Furthermore, the pressing force can be generated without using a mechanical structure that can generate 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 rd, the fluid ejected from the fluid ejection mechanism 63 causes the urging means 48 and the dust-proof seal member 50 to move. are pressed inward in the radial direction rd. That is, the urging means 48 and the dustproof seal member 50 are pressed toward the side wall located inside the groove 25 in the axial direction ad. On the other hand, the fluid ejected from the fluid ejecting mechanism 63 flows outward in the radial direction rd from the gap between the fixed scroll 20 and the movable scroll 30 and is discharged to the outside. As a result, it is possible to more effectively prevent dust from entering from the outside through the same gap. Even if part of the cooling air for each scroll 20, 30 tries to flow in from the outside through the gap, the fluid is ejected from the fluid ejection mechanism 63 at a pressure (eg, 1 kPa) higher than the inflow pressure (eg, 800 Pa). The inflow can be effectively prevented.

Furthermore, in the example shown in FIG. 9 , 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 . The fluid jetting mechanism 63 jets the fluid into the groove 25 . Such a fluid ejection mechanism 63 can be applied to the existing scroll fluid machine 10 without restricting the configuration of the scroll fluid machine 10 itself.

<Fifth example>
Next, mainly with reference to FIGS. 10 and 11, a fifth example of the dust-proof seal structure that makes it possible to effectively prevent leakage at the abutment will be described. In the example shown in FIGS. 10 and 11, the cut portion CU is formed without imposing restrictions on the engagement surfaces of the two portions (both ends forming the abutment portion) 51 and 52 that form the cut portion CU. Leakage at the cut portion CU (abutment portion) is prevented by generating a force that presses the two portions (both ends) 51 and 52 toward each other.

10 and 11, one of the fixed scroll 20 and the movable scroll 30 is formed with a circumferential groove 25 surrounding the working chamber 11, and the dustproof seal member 50 is arranged in the groove 25. there is 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 (radial direction) rd to form an abutment portion 55 . As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape. Furthermore, the dust-proof seal member 50 has an inner end (inner portion) 51 and a and an outer edge (outer portion) 52 located on the outside.

The dustproof seal member 50 includes an inner extending piece (inner lip) 51f projecting inward in the radial direction rd from an inner side surface 51a facing inward in the radial direction rd of the inner end portion 51, and an outer end portion 52. At least one of the outer extending pieces (outer lip) 52f projecting outward in the radial direction rd from the outer side surface 52b facing outward in the radial direction rd is provided. In the illustrated example, the inner end portion 51 is provided with an inner extension piece 51f, and the outer end portion 52 is provided with an outer extension piece 52f. The inner extending piece 51f comes into contact with the inner wall surface of the groove 25 in the radial direction rd, and presses the inner end portion 51 toward the outer end portion 52 along the radial direction rd. The outer extending piece 52f comes into contact with a wall surface located outside in the radial direction rd of the groove 25, and presses the outer end portion 52 toward the inner end portion 51 along the radial direction rd. The extension pieces 51f and 52f keep the two portions (both ends of the dustproof seal member 50) 51 and 52 that form the cut portion CU in contact with each other in the width direction (radial direction) rd. Leakage at the abutment portion 55 can be effectively prevented. As with the pressing means 60 in the fourth example, either one of the inner extending piece 51f and the outer extending piece 52f may be omitted.

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

As well shown in FIG. 11, the inner extending piece 51f tapers inward in the radial direction rd, and the outer extending piece 52f tapers outward in the radial direction rd. According to this example, the elastic force of the inner extending piece 51f and the outer extending piece 52f is stably exerted, and the both end portions 51 and 52 of the dustproof seal member 50 are in contact with each other in the radial direction rd. can be maintained stably.

11, the inner extending piece 51f includes a distal side surface 51fa and a proximal side surface 51fb facing each other in the longitudinal direction of the dustproof seal member 50 (the direction coinciding with the circumferential direction cd). there is The distal end side surface 51fa is a surface on the side close to the distal end of the inner end portion 51 along the longitudinal direction of the dustproof seal member 50, and the base end side surface 51fb is along the longitudinal direction of the dustproof seal member 50 and is an intermediate portion. This is the surface on the side close to 53 . Then, when observing from the direction in which the fixed scroll and the movable scroll face each other (that is, observing along the axial direction ad in FIG. 11), the angle (strictly speaking, , the smaller of the two angles (minor angle)) 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, the smaller of the two angles). angle (minor angle)) is smaller than θ1b. According to such an inner extending piece 51f, movement of the inner extending piece 51f within the groove 25 during thermal expansion of the dustproof seal member 50 is less likely to be hindered. As a result, the dust-proof seal member 50 can be effectively prevented from meandering, twisting, bending, etc. within the groove 25, and the arrangement of the dust-proof seal member 50 within the groove 25 can be stabilized. At the same time, the force that urges the inner end portion 51 toward the outer end portion 52 can be effectively exerted, particularly during heat shrinkage. For these reasons as well, it is possible to more effectively prevent leakage at the cut portion CU (the abutment portion 55).

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

<Sixth example>
Next, mainly with reference to FIG. 12, a sixth example of the dust-proof seal structure that makes it possible to effectively prevent leakage at the abutment will be described. In the example shown in FIG. 12, the cut portion CU is formed by using the paste-like material 28 without imposing restrictions on the engagement surfaces of the portions (both ends forming the abutment portion) 51 and 52 forming the cut portion CU. (Abutment) is designed to prevent leakage.

In the example shown in FIG. 12 as well, one of the fixed scroll 20 and the movable scroll 30 is formed with a circumferential groove 25 surrounding the working chamber 11 , and the dustproof seal member 50 is arranged in the groove 25 . 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 (radial direction) rd to form an abutment portion 55 . As a result, the dustproof seal member 50 surrounds the working chamber 11 in a circumferential shape.

In the sixth example, at least a region around the cut portion CU (abutment portion 55) in the groove 25 is filled with the paste-like material . The pasty material 28 includes semi-solid materials and highly viscous materials. Typically, grease can be used as the paste-like material 28 . Grease is generally used as a lubricant in mechanical devices and the like. On the other hand, in this example, in addition to preventing leakage at the cut portion CU (abutment portion 55), it can be expected to capture dust and the like. As a result of confirmation by the inventors of the present invention, the pasty material 28 gradually loses fluidity and hardens when it captures dust or the like. Normally, the pasty material 28 hardened in this way cannot achieve its original purpose (for example, the lubricating effect of grease). However, in use in this example, hardening and reducing fluidity causes the pasty material 28 to stay in the joint 55 and contribute to preventing leaks and capturing dust at the joint 55 . It can be said that such a function of the paste-like material 28 is particularly suitable for the lubrication-free scroll type fluid machine 10 with low maintenance frequency.

Although FIG. 12 shows the configuration 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 biasing means provided between the dust-proof seal member 50 and the groove 25 is linear like the dust-proof seal member 50, the paste-like material 28 effectively functions also for the abutment of the biasing means. can do. Also, for example, the paste material 28 can effectively function for the cut portion CU (abutment portion 55) shown in FIGS. 10 and 11 and other cut portions (abutment portions). 10 and 11, the paste-like material 28 is provided on the outer side surface 51b of the inner end (inner portion) 51, but the inner side surface of the outer end (outer portion) 52 is The paste-like material 28 may be provided on 52 a , or the paste-like material 28 may be provided on both the outer side surface 51 b of the inner end (inner portion) 51 and the inner side surface 52 a of the outer end (outer portion) 52 . may be provided.

According to the sixth example as described above, the paste-like material 28 is placed between the two ends 51 and 52 forming at least the cut portion CU in the groove 25, 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 two portions (both ends 51 and 52 at the abutment portion 55) that form the cut portion CU, thereby causing the cut portion CU ( It is possible to prevent leakage at the abutment portion 55) and to capture dust. Also, the paste-like material 28 reduces fluidity by capturing dust. The paste-like material 28 with reduced fluidity stays in the cut portion CU (abutment portion 55) and can continue to exhibit the leak prevention function and the dust trapping function, which 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 embodiment is a non-bearing annular metallic first seal portion which is to be placed on one of the first and second parts 20 and 30 which are movable relative to each other and which are opposed to each other. Sa, and an unsupported annular second seal portion Sb made of resin or rubber, which is provided on the first seal portion Sa and comes into contact with the other of the first part 20 and the second part 30 there is

According to such a second aspect, first, by not providing an abutment portion, it is possible to improve the sealing performance. In addition, according to the first metal seal portion Sa, which is less likely to be thermally deformed than resin or rubber, which has been widely used in the past, rigidity and durability can be imparted to the seal S, and thermal expansion and thermal contraction can be achieved. can be effectively suppressed. As a result, meandering and twisting of the dustproof seal member 50 can be effectively prevented. Furthermore, by including the second sealing portion Sb made of resin or rubber, it is possible to ensure tight sealing with the first component or the second component. Therefore, the second aspect also allows a tight seal between the first part 20 and the second part. That is, according to the second aspect, the first seal portion Sa, which is resistant to thermal deformation, and the second seal portion Sb, which is excellent in airtightness, are combined to stabilize the space between the first component 20 and the second component 30. can be sealed with When applied to the scroll type fluid machine 10, the inflow of dust into the working chamber 11 can be effectively prevented, and unexpected early deterioration of the tip seals 23a, 33a of the fixed wrap 23 and the movable wrap 33 can be prevented. 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 equal to the thickness of the first seal portion Sa (the first dimension along the axial direction ad). dimension of the seal portion Sa). Further, the aspect ratio (ratio of height to width) of the second seal portion Sb is preferably smaller than the aspect ratio (ratio of height to width) of the first seal portion Sa. In these cases, the amount of deformation in the axial direction ad of the second seal portion Sb, which is more easily deformed than the first seal portion Sa, can be effectively reduced. As a result, it is possible to effectively prevent deterioration of the sealing performance 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. Also, 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.

The second aspect of the seal structure will be described below with reference to specific examples. However, the following specific configuration is merely an example, and various modifications are possible.

<Seventh example>
Next, mainly with reference to FIGS. 13 and 14, a seventh example of the dustproof seal structure will be described. In the examples shown in FIGS. 13 and 14, the sealing performance of the dust-proof seal member 50 is improved by not providing the dust-proof seal member with an abutment.

In the example shown in FIGS. 13 and 14, one dustproof seal member 50 integrally formed is provided as a seal (seal component) S between the fixed scroll 20 and the movable scroll 30. . The dustproof seal member 50 includes a non-supporting annular metal first seal portion Sa and a non-supporting annular second seal portion Sb 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 comes into contact with the other of the fixed scroll 20 and the movable scroll 30 . The dustproof seal member 50 takes in the working chamber 11 and seals between the fixed scroll 20 and the movable scroll 30 . The dust-proof seal member 50 has an annular main body portion 56 which is free from metal and made of metal.

The abutment portion 55 is provided to allow thermal expansion and contraction of the dustproof seal member 50 within the groove 25 formed in one of the scrolls 20 and 30 . During operation of the scroll fluid machine 10 , the temperature of the scrolls 20 and 30 rises mainly due to air compression in the working chamber 11 . As the temperatures of the scrolls 20 and 30 change, 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 dust-proof seal member 50 is made of resin or rubber that is easily deformed by heat.

In the seventh example, the dust-proof sealing member 50 has a free annular metallic annular body portion 56 . The annular body portion 56 forms a first seal portion Sa of the seal (seal component) S. As shown in FIG. The annular main body 56 is made of a metal that is less likely to be thermally deformed than resin or rubber that has been widely used in the past. Also, the material used for the scrolls 20 and 30 is generally metal having high rigidity and wear resistance, like the annular main body portion 56 . Therefore, the metallic ring-shaped main body 56 can effectively suppress thermal expansion and thermal contraction, and exhibits deformation behavior similar to that of the groove 25 that holds the ring-shaped main body 56 . Moreover, the metallic ring-shaped body portion 56 itself has high rigidity and is less likely to be deformed such as torsion. For these reasons, the unsupported annular metal annular main body 56 effectively prevents meandering and twisting in the groove 25 during operation of the scroll fluid machine 10 without the abutment 55. , and the space between the fixed scroll 20 and the movable scroll 30 can be stably sealed. In addition, since a leak that is routed between both ends of the abutment portion 55 can be prevented, 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 moderate rigidity, excellent heat dissipation and light weight is widely used. Therefore, it is preferable to use aluminum or an aluminum alloy as the material of the annular body portion 56 . According to this example, the linear expansion coefficients of the annular main body 56 and the scrolls 20, 30 forming the groove 25 are approximately the same, and the dust-proof seal member 50 meanders and bends within the groove 25 due to the difference in expansion rate and contraction rate. , torsion and the like can be suppressed more effectively, and the gap 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 fluororesin layer 57 laminated on the annular body portion 56 . The fluororesin layer 57 forms a second seal portion Sb of the seal (seal component) S. As shown in FIG. This fluororesin layer 57 contacts the scroll (the 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 polytetrafluoroethylene (PTFE), for example. Therefore, by providing the fluororesin layer 57 , it is possible to effectively prevent the wear of the dustproof seal member 50 and the flow of wear powder into the working chamber 11 . The thickness of the fluororesin layer 57 may be as small as several hundred micrometers in contrast to the annular main body 56 having a thickness of several millimeters.

<Eighth example>
Next, mainly with reference to FIGS. 15 to 18, an eighth example of the dustproof seal structure will be described. In the examples shown in FIGS. 15 to 18, the sealing performance of the dustproof seal member is improved by not providing the dustproof seal member with an abutment.

In the example shown in FIGS. 15 and 16, the scroll fluid machine 10 includes a first dustproof seal member 50a supported by one of the fixed scroll 20 and the movable scroll 30, and a dustproof seal member 50a disposed on the first dustproof seal member 50a. and a second dustproof seal member 50b. Among them, 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 50 b contacts the other of the fixed scroll 20 and the movable scroll 30 . The first dust-proof seal member 50a and the second dust-proof seal member 50b surround the action chamber 11 and seal the space between the fixed scroll 20 and the movable scroll 30. As shown in FIG.

The first dust-proof seal member 50a and the second dust-proof seal member 50b are formed in a seamless endless annular shape. Therefore, an abutment that causes leakage is not formed. That is, it is possible to prevent the conventional leak in which the passage is between the two ends at the abutment, so that the entry of dust into the working chamber 11 can be effectively prevented.

The first dustproof seal member 50a forming the first seal portion Sa is made of a metal that is less susceptible to thermal deformation than resin or rubber that has been widely used in the past. The material used for the scrolls 20 and 30 is generally metal having high rigidity and wear resistance, like the first dustproof seal member 50a. Therefore, the first dustproof seal member 50a made of metal can effectively suppress thermal expansion and thermal contraction, and further exhibits a deformation behavior similar to that of the groove 25 that holds the first dustproof seal member 50a. become. In addition, the first dustproof seal member 50a made of metal itself has high rigidity and is resistant to deformation such as torsion. For these reasons, even without the abutment portion 55, the unsupported annular metal annular body portion 56 can cause leakage in the groove 25 during the operation of the scroll fluid machine 10. It is possible to effectively prevent the occurrence of meandering and twisting.

As described above, as the material for the fixed scroll 20 and the orbiting scroll 30, an aluminum alloy is widely used, which has appropriate rigidity, is excellent in heat dissipation, and is light in weight. Therefore, it is preferable to use aluminum or an aluminum alloy as the material of the first dustproof seal member 50a. According to this example, the coefficients of linear expansion of the first dustproof seal member 50a and the scrolls 20 and 30 forming the groove 25 are approximately the same, and the first dustproof seal member 50a in the groove 25 due to the difference in expansion rate and shrinkage rate. meandering, bending, twisting, etc., can be more effectively suppressed, and the gap between the fixed scroll 20 and the movable scroll 30 can be more stably sealed.

The second dustproof seal member 50b forming the second seal portion Sb is made of resin or rubber. As shown in FIG. 16, the second dustproof seal member 50b made of resin or rubber is stacked 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 biasing means 48 via the first dustproof seal member 50a. The second dustproof sealing member 50b made of resin or rubber has excellent sealing performance with the scroll. Therefore, the space between the fixed scroll 20 and the movable scroll 30 can be effectively sealed.

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

The second dustproof sealing member 50b made of resin or rubber has excellent sealing properties, but also has a relatively large coefficient of thermal expansion. For this reason, during operation of the scroll fluid machine 10, it is thermally deformed to some extent due to heat generation caused by air compression. In the example shown in FIG. 17, the first dustproof seal member 50a and the second dustproof seal member 50b are arranged in the groove 25, but the width wb along the radial direction of the second dustproof seal member 50b is the width of the groove. is sufficiently small compared to the width wm of . Therefore, the groove 25 that holds the second dustproof seal member 50b allows thermal expansion and contraction of the second dustproof seal member 50b. Particularly, 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 expands or contracts and can move in the radial direction rd above the wide first dustproof seal member 50a. As a result, it is possible to effectively prevent meandering and twisting of the second dustproof seal member 50b that may cause leakage in the groove 25 during operation of the scroll fluid machine 10 .

In the illustrated example, as shown in FIG. 16, the surfaces with which the first dustproof seal member 50a and the second dustproof seal member 50b abut are inclined with respect to the radial direction rd. More specifically, the first dustproof seal member 50a has a first surface 50a1 facing the movable scroll 30 in the axial direction ad and a second surface 50a2 facing the fixed scroll 20 in the axial direction ad. ing. The second dustproof seal member 50b has a first surface 50b1 facing the movable scroll 30 side in the axial direction ad and a second surface 50b2 facing the fixed scroll 20 side in the axial direction ad. The first surface 50a1 of the first dustproof seal member 50a and the second surface 50b2 of the second dustproof seal member 50b form contact surfaces that contact each other. The second surface 50b2 is inclined with respect to the radial direction 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 direction 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 dustproof seal member 50a becomes thicker toward the outer side in the radial direction rd, and the thickness of the second dustproof seal member 50b becomes thinner toward the outer side in the radial direction rd. Along with this, the contact surfaces of the first dustproof seal member 50a and the second dustproof seal member 50b move outward in the radial direction rd from the fixed scroll 20 side to the movable scroll 30 side.

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 temperatures. On the other hand, when heat is generated mainly due to air compression during operation of the scroll fluid machine 10, the first dustproof seal member 50a and the second dustproof seal member 50b move to the state indicated by the two-dot chain line. That is, when the second dustproof seal member 50b thermally expands due to heat generation and moves outward in the radial direction rd in the groove 25, the first dustproof seal member 50a moves toward the fixed scroll 20 along the axial direction ad. move to At this time, the pressing force from the biasing means 48 that presses the second dustproof seal member 50b against the movable scroll 30 gradually increases. In the example shown in FIG. 16, during and after thermal expansion after the start of operation of the scroll fluid machine 10, the biasing force from the biasing means 48 increases, causing the fixed scroll 20 and the movable scroll 30 to move. between can be stably sealed.

However, the configuration of the contact surfaces 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 the examples shown in FIGS. 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 in the example shown in FIG. According to this example, during thermal expansion after the operation of the scroll fluid machine 10 is started, the second dustproof seal member 50b easily moves outward in the radial direction rd on the first dustproof seal member 50a. Thermal expansion of the seal member 50b is less likely to be hindered. This effectively prevents deformation such as meandering and twisting of the first dust-proof seal member 50a and the second dust-proof seal member 50b. In the example shown in FIG. 18, the first surface 50a1 and second surface 50a2 of the first dustproof seal member 50a and the first surface 50b1 and second surface 50b2 of the second dustproof seal member 50b are arranged radially. 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 stabilized, and the gap between the fixed scroll 20 and the movable scroll 30 can be stably sealed.

17 and 18, as in FIG. 16, the solid lines indicate the states of the first dustproof seal member 50a and the second dustproof seal member 50b at low temperatures, and the states of the first dustproof seal member 50a and the second dustproof seal member 50b at high temperatures. 2 The state of the dustproof seal member 50b is indicated by a chain double-dashed 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 resin or rubber-made second dustproof seal member 50b which is provided on the first dustproof seal member 50a and contacts the other of the fixed scroll 20 and the movable scroll 30. As shown in FIG. According to such a scroll fluid machine 10, a combination of the first dustproof seal member 50a, which is resistant to thermal deformation during operation of the scroll fluid machine 10, and the second dustproof seal member 50b, which is excellent in airtightness, provides a fixed structure. A space between the scroll 20 and the movable scroll 30 can be stably sealed.

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 first dustproof seal member 50a and the second dustproof seal member 50b are fixed in the same groove 25. A scroll 20 and a movable scroll 30 are arranged so as to overlap each other in the facing direction. Such an arrangement allows the first dustproof seal member 50a and the second dustproof seal member 50b to more stably perform the sealing function described above.

Furthermore, 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 rd on the first dustproof seal member 50a. The combination of the second dustproof seal member 50b makes it possible to seal the space between the fixed scroll 20 and the movable scroll 30 more stably.

Further, the contact surfaces with which the first dustproof seal member 50a and the second dustproof seal member 50b abut are inclined with respect to the radial direction rd. According to the configuration of the abutting surfaces, even when the first dustproof seal member 50a and the second dustproof seal member 50b are thermally deformed, the space between the fixed scroll 20 and the movable scroll 30 can be stably sealed. can.

<<Third Aspect>>
Next, the 3rd aspect of a seal structure is demonstrated. The seal (seal component) S in the third aspect is arranged in contact between the first component 20 and the second component 30 which are relatively movable and face each other. The annular seals S overlap at one or more places while being 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 rest of the seal S along cd. In other words, the annular seal S includes a region in which two or more portions are arranged so as to overlap in the width direction rd. The length along the circumferential direction cd of the area Ay (see FIGS. 19 and 21) where two or more portions of the seal S overlap is the circumferential direction cd of the other area Ax (see FIGS. 19 and 21) longer than along the In other words, the length along the circumferential direction cd of the region Ay where the seal S doubles or triples in the width direction rd is the circumferential direction cd of the region Ax where the seal S extends alone in the circumferential direction cd. longer than along the

According to such an aspect, the area where the seals S are arranged to overlap in the width direction becomes longer. In particular, it is also possible for the seals S to overlap in the width direction over more than half of the length of the annular seal S. According to this aspect, the area surrounded by the ring-shaped seal S can be effectively sealed from the outside by lengthening the entry path for foreign matter such as dust. When applied to the scroll type fluid machine 10, the inflow of dust into the working chamber 11 can be effectively prevented, and unexpected early deterioration of the tip seals 23a, 33a of the fixed wrap 23 and the movable wrap 33 can be prevented. can be effectively avoided.

In addition, in the third embodiment, one dustproof seal member 50 is provided alone at the narrowest portion, and as shown in FIG. Two or more may be provided spaced apart 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 apart from each other in the longitudinal direction of the seal S. Such a seal S can be easily realized with a simple configuration using two dustproof seal members 50 . Moreover, the installation of the two dustproof seal members 50 in this case is extremely easy, and by arranging them accurately, it is possible to ensure stable airtightness.

Furthermore, in the third aspect, one of the narrowest portions Ax Ax1 is provided in a region including one p1 of two positions p1 and p2 that are the most separated along the circumferential direction cd of the seal S, and has the narrowest width. Another narrow portion Ax Ax2 may be provided in a region including the other p2 of the two positions. In other words, one Ay1 of the regions Ay where two or more portions of the seal S overlap is provided in a region including one p3 of the two positions furthest apart along the circumferential direction cd of the seal S. Another one Ay2 of the regions Ay where two or more portions overlap may be provided in a region including the other p4 of the two positions. According to such an example, it is possible to ensure excellent airtightness, as will be 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 a ninth example described below, 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 .

The third aspect of the seal structure will be described below with reference to specific examples. However, the following specific configuration is merely an example, and various modifications are possible.

<Ninth example>
Next, mainly with reference to FIGS. 19 and 20, a ninth example of the dustproof seal structure will be described. In the examples shown in FIGS. 19 and 20, the dust-proof sealing member 50 improves the airtightness of the dust-proof seal member 50 by significantly increasing the length of the entrance path of the dust.

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 orbiting scroll 30 and comes into contact with the other of the fixed scroll 20 and the orbiting scroll 30 . The dust-proof sealing member 50 is linear, and in the illustrated example, surrounds the working chamber 11 by approximately two circumferences. As a result, the dustproof seal member 50 can seal the working 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 movable scroll 30 . As shown in FIG. 19, the groove 25 can have a constant width along the circumferential direction cd. The dust-proof seal member 50 makes approximately two turns in the groove 25, in other words, extends approximately 720°, so that most of the region along the circumferential direction cd of the groove 25 has a width direction (radial direction) rd. The two parts of the dustproof seal member 50 are arranged side by side.

As shown in FIG. 20, the dust-proof sealing member 50 and the biasing means 48 are arranged in the direction (axial direction ad) in which the fixed scroll 20 and the movable scroll 30 face each other to seal the space between the fixed scroll 20 and the movable scroll 30. In this case, the dust flowing into the working chamber 11 passes between the two dustproof seal members 50 arranged in the radial direction rd. In the example shown in FIG. 19, the dust that flows into the working chamber 11 must move around the working chamber 11 substantially around the circle between the two dustproof seal members 50 arranged in the radial direction rd. . Therefore, according to the dust-proof seal member 50 that encircles the work chamber 11 approximately two times, the space between the fixed scroll 20 and the movable scroll 30 is stably sealed, and the inflow of dust and the like into the work 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 angular range θr1 of approximately 720°. However, from the viewpoint of effectively preventing dust and the like from entering the working chamber 11, the dustproof seal member 50 need not extend over such a large angular range θr1. For example, if the angle range θr1 in which the dust-proof seal member 50 surrounds the working chamber 11 is 405° (360°+45°) or more, the airtightness can be sufficiently improved. In addition, from the viewpoint of improving sealing performance, the angle range θr1 is preferably 450° (360°+90°) or more, more preferably 540° (360°+180°) or more. More preferably approximately 720° as indicated at 19 .

<Tenth example>
Next, mainly with reference to FIGS. 21 and 22, a tenth example of the dustproof seal structure will be described. 21 and 22, similar to the ninth example, the dust-proof sealing member 50 improves the airtightness by lengthening the entrance path of the dust.

In the ninth example, the scroll fluid machine 10 has a first dustproof seal member 50c and a second dustproof seal member 50d. That is, the dust-proof seal S includes a first dust-proof seal member 50c and a second dust-proof 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 abut on 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. Also, the first dustproof seal member 50c at least partially surrounds the second dustproof seal member 50d. The second dustproof seal member 50d surrounds the working chamber 11 from all sides together with the first dustproof seal member 50c. As a result, the first dustproof seal member 50 c and the second dustproof seal member 50 d can seal the working chamber 11 between the fixed scroll 20 and the movable scroll 30 .

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

When the dustproof seal member 50 and the biasing means 48 are arranged in the direction (axial direction ad) in which the fixed scroll 20 and the movable scroll 30 face each other to seal the space between the fixed scroll 20 and the movable scroll 30, the working chamber 11 passes between both ends 58a and 58b of the first dustproof seal member 50c positioned outside in the radial direction rd, and then passes through both ends 59a of the second dustproof seal member 50d positioned inside. , 59b. Therefore, the two dustproof seal members 50 c and 50 d arranged around the working chamber 11 stably seal the space between the fixed scroll 20 and the movable scroll 30 and prevent dust from entering the working chamber 11 . 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 displaced in the circumferential direction cd from the position pb. According to this example, the dust flowing into the working chamber 11 must move in the circumferential direction cd from the position pa to the position pb in the space between the two dustproof seal members 50c and 50d. Therefore, according to the two dustproof seal members 50c and 50d arranged around the working chamber 11, the gap between the fixed scroll 20 and the movable scroll 30 is more stably sealed, preventing dust from entering the working chamber 11. can be effectively prevented.

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 shifted from the position pb by approximately half the circumference, that is, by approximately 180° in the circumferential direction cd. Such a configuration is preferable for preventing dust and the like from entering 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 If θs is 45° or more, the airtightness can be sufficiently improved, and if this angle θs is 90° or more, the airtightness can be improved more effectively.

Also, unlike the examples shown in FIGS. 21 and 22, the seal (seal component) S may include three or more dust-proof seal members 50 . For example, when the seal S includes three dustproof seal members 50, the positions between the two end portions of the respective dustproof seal members 50 are shifted in the circumferential direction cd by an angle of 90° or more and 150° or less. Alternatively, it is more preferable to shift in the circumferential direction cd by an angle of 120°.

Furthermore, 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. The first dustproof seal member 50c and the second dustproof seal member 50d respectively constitute the dustproof seal member 50 in the first aspect described above. Both ends 58a and 58b of the first dustproof seal member 50c overlap in the width direction (radial direction) rd to form a cut portion CU (abutment portion 55). Similarly, both end portions 59a and 59b of the second dustproof seal member 50d form a cut portion CU (abutment portion 55) so as to overlap in the width direction (radial 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 at least one of the first dustproof seal member 50c and the second dustproof seal member 50d form the cut portion CU (abutment portion 55). , the airtightness can be further improved, and in addition, since the first dustproof seal member 50c and the second dustproof seal member 50d have different end configurations, dust of various shapes can be handled, Sealability can be further improved.

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 (radial direction) rd and a width direction (diameter direction) of the inner end portion 58a. and an outer end (outer portion) 58b located outside in direction )rd. The inner end portion 58a is positioned 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 (radial direction) rd and an outer end portion located outside the inner end portion 59a in the width direction (radial direction) rd. (Outer portion) 59b. The inner end portion 59a is positioned on the other side in the circumferential direction cd with respect to the outer end portion 59b. That is, the positions in the circumferential direction cd of the inner and outer ends of the first dustproof seal member 50c and the second dustproof seal member 50d are reversed. According to such an example, 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 is , the advancing direction in the circumferential direction cd is reversed halfway. Therefore, it is possible to further improve the airtightness of the first dustproof seal member 50c and the second dustproof seal member 50d.

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 forms. In addition, in the above-described embodiment, a plurality of specific examples have been described with reference to the drawings. It is also possible to apply it in appropriate combination with the configuration of the unit.

Also, the configuration of the dustproof seal member 50 described above can be similarly applied to the biasing means 48 . For example, the biasing means 48 may be provided with a cut portion and an abutment portion, and the configurations of the cut portion CU and the abutment portion 55 of the dustproof seal member 50 described above may be applied. By adopting the configuration of the dust-proof seal member 50 described above for the biasing means 48, leakage in the biasing means 48 can be effectively prevented.

Claims (2)

a first scroll and a second scroll that are relatively movable and face each other;
a dust-proof seal positioned between the first scroll and the second scroll and in contact with each of the first scroll and the second scroll ;
An annular groove is formed in one of the first scroll and the second scroll,
The dust-proof seal surrounds the annular groove, and is arranged such that the dust-proof seal on the first round and the dust-proof seal on the second round are in contact with each other in the radial direction,
The circumferential length of the region where both the dust-proof seal of the first round and the dust-proof seal of the second round are located in the groove is equal to the length of the dust-proof seal of the first round and the dust-proof seal of the second round in the groove. longer than the circumferential length of the area where only one of the dust-proof seals on the circumference is located,
Scroll type fluid machinery. a first scroll and a second scroll that are relatively movable and face each other;
a first dust-proof seal and a second dust-proof seal positioned between the first scroll and the second scroll and in contact with the first scroll and the second scroll, respectively;
An annular groove is formed in one of the first scroll and the second scroll,
the first dust-proof seal and the second dust-proof seal encircle the annular groove and are arranged so as to be in radial contact with each other;
The circumferential length of the region where both the first dust seal and the second dust seal are located in the groove is such that only one of the first dust seal and the second dust seal is located in the groove. longer than the circumferential length of the region,
Scroll fluid machine.

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