WO2017208833A1

WO2017208833A1 - Scroll-type fluid machine

Info

Publication number: WO2017208833A1
Application number: PCT/JP2017/018604
Authority: WO
Inventors: 金敬宮澤; 聡伊能
Original assignee: サンデン・オートモーティブコンポーネント株式会社
Priority date: 2016-05-30
Filing date: 2017-05-11
Publication date: 2017-12-07
Also published as: JP2017214842A

Abstract

Provided is a scroll-type fluid machine with which it is possible to improve sealing properties in a specific area of the scroll while reducing management accuracy of clearance in the direction of extension of the central axis between both scrolls, and without detriment to the ease with which a tip seal can be fitted. The tip seal 40 has a shape in which the height position in the direction of extension of the coil central axis X2 changes continuously from one end W1 to the other end W2 in the coil extension direction. If an external load is applied in the direction of extension of the coil central axis X2, the tip seal 40 extends in the direction of extension of the coil central axis X2. The tip seal 40 is formed in such a manner that in a state of being fitted inside the tip seal groups 2c, 3c and without external force being applied, the tip seal bottom surface 40b that faces the bottom surfaces 2d, 3d of the tip seal grooves 2c, 3c is positioned inside the tip seal grooves 2c, 3c over the entirety from one end W1 to the other end W2 in the direction of extension of the coil.

Description

Scroll type fluid machinery

The present invention relates to a scroll type fluid machine, and more particularly to a scroll type fluid machine having a tip seal assembled in a groove formed at a tip portion of a wrap.

The scroll type fluid machine includes a fixed scroll and a movable scroll that each have a bottom plate and a spiral wrap standing on the bottom plate and mesh with each other. A working chamber (sealed space) for the working fluid is defined between the laps of the two scrolls engaged with each other. The scroll type fluid machine compresses or compresses the fluid by changing the volume of the working chamber by rotating orbiting the movable scroll around the center axis of the fixed scroll while preventing the rotation of the movable scroll by the rotation prevention mechanism. Inflate.
As this type of scroll type fluid machine, for example, a scroll type compressor described in Patent Document 1 is known. In this scroll compressor, a tip seal is disposed in a groove formed in a spiral shape along the tip of each lap of the fixed scroll and the movable scroll. And the clearance of the center axis extending direction between the two scrolls is the other scroll in which the one end surface (contact surface) in the thickness direction protruding from the tip surface of the wrap in the tip seal disposed in the groove of one scroll faces. It is adjusted to press the bottom plate. Therefore, the one end surface in the thickness direction of the chip seal presses the bottom plate with a uniform pressing force over the whole from one end to the other end in the spiral extending direction.

JP 2002-285980 A

By the way, in this type of scroll compressor, when the tip seal is required to improve the sealing performance of the working chamber on the center side of the scroll, the scroll is given priority to the improvement of the compression capability in the low speed rotation region. In some cases, it is required to improve the sealing performance of the working chamber on the outer end (outer peripheral portion) side.
However, in the scroll compressor described in Patent Document 1, the one end surface in the thickness direction of the tip seal presses the bottom plate with a uniform pressing force from one end to the other end in the spiral extending direction. There is a problem that the sealing performance for a specific region such as the center side or the outer end side of the scroll cannot be improved. Further, in the scroll compressor described in Patent Document 1, it is necessary to accurately set the clearance in the direction of extension of the central axis between both scrolls in order to appropriately secure the sealability of the working chamber, and clearance management There is also a problem that it takes time and effort. In this type of scroll compressor, since the chip seal must be assembled in the grooves of the laps of both scrolls, the assembling operation of the chip seal into the grooves requires skill. Therefore, in solving the above problem, the workability of assembling the chip seal should not be lowered. Further, the same problem occurs not only in the scroll type compressor but also in the scroll type expander.
The present invention has been made paying attention to such a situation, and the scroll while reducing the management accuracy of the clearance in the central axis extending direction between both scrolls without reducing the workability of assembling the tip seal. An object of the present invention is to provide a scroll type fluid machine capable of improving the sealing performance for a specific region.

A scroll type fluid machine according to one aspect of the present invention includes a fixed scroll and a movable scroll each having a bottom plate and a spiral wrap standing on the bottom plate and meshed with each other, and at least one of the two scrolls. By disposing a spiral tip seal in a plan view in a groove formed at the tip of the wrap, a working fluid working chamber is defined between the wraps of both scrolls. The tip seal has a shape in which the height position in the spiral central axis extending direction continuously changes from one end side to the other end side in the spiral extending direction. The tip seal expands and contracts in the spiral central axis extending direction when an external force in the spiral central axis extending direction is applied. Further, the tip seal is assembled into the groove and the bottom surface of the tip seal facing the bottom surface of the groove extends from one end to the other end in the spiral extending direction in a state where the external force is not applied. It is formed so as to be located inside.

According to the scroll type fluid machine of one aspect of the present invention, the tip seal has a shape in which the height position in the spiral central axis extending direction is continuously changed from one end side to the other end side in the spiral extending direction. The tip seal is formed so that the height position of the tip seal is higher than the other portions in a portion corresponding to a specific region such as the center side or the outer end side where the scroll sealing performance needs to be improved. can do. As a result, the pressing force from the chip seal to the bottom plate in the specific area of the scroll becomes higher than the pressing force in the other areas, and the sealing performance for the specific area can be improved.
Further, since the tip seal is configured to expand and contract in the spiral center axis extending direction (that is, the center axis extending direction of both scrolls) when an external force in the spiral center axis extending direction is applied, the entire tip seal is arranged in the spiral center axis. It functions as a spring that expands and contracts in the stretching direction. As a result, even if an error (manufacturing error) occurs between the actual clearance and the target clearance in the direction of extension of the central axis between the two scrolls, the error is reduced by the extension allowance in the direction of extension of the center axis of the spiral of the tip seal. Can be absorbed within range. Therefore, it is not necessary to initialize the clearance with high accuracy.
The tip seal is assembled in the groove and the bottom surface of the tip seal facing the bottom surface of the groove is the groove extending from one end to the other end in the spiral extending direction while no external force is applied in the spiral central axis extending direction. It is formed so as to be located inside. That is, the tip seal is formed with the height position restricted so that the entire end surface (chip seal bottom surface) facing the bottom surface of the groove is located in the groove. As a result, the tip seal is formed in a shape in which the height position in the direction of extension of the spiral central axis changes in a free state where no external force is applied (that is, a natural length as a spring). Sometimes the entire end face can be placed in the groove at the same time. Therefore, the chip seal can be assembled into the groove in the same procedure as the conventional planar chip seal.
In this way, it is possible to improve the sealing performance for a specific area of the scroll while reducing the management accuracy of the clearance in the direction of extension of the central axis between the two scrolls without reducing the workability of assembling the tip seal. A scroll-type fluid machine can be provided.

It is sectional drawing which shows the whole structure of the scroll type fluid machine of this embodiment. It is the perspective view which looked at the movable scroll of the said scroll type fluid machine from the lap side. It is a perspective view of the chip seal of the scroll type fluid machine. It is a conceptual diagram for demonstrating the change of the height position of the said chip seal. It is the conceptual diagram which showed the assembly | attachment state to the groove | channel of the chip seal shown in FIG. It is the conceptual diagram which showed the change of the pressing force in the use condition of the chip seal shown in FIG. It is a side view of the chip seal manufactured by enlarging the change in the height position. It is the conceptual diagram which showed the assembly | attachment state to the groove | channel of the chip seal shown in FIG. It is the conceptual diagram which showed the use condition of the chip seal | sticker shown in FIG. It is a conceptual diagram for demonstrating the modification of the said chip seal. It is the conceptual diagram which showed the assembly | attachment state to the groove | channel of the chip seal shown in FIG. It is the conceptual diagram which showed the change of the pressing force in the use condition of the chip seal shown in FIG. It is a conceptual diagram for demonstrating another modification of the said chip seal. It is the conceptual diagram which showed the assembly | attachment state to the groove | channel of the chip seal shown in FIG. It is the conceptual diagram which showed the change of the pressing force in the use condition of the chip seal | sticker shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The scroll fluid machine according to the present invention can be used as a compressor or an expander. In the present embodiment, a case where the present invention is applied to a compressor will be described as an example.
1 to 3 show the configuration of the scroll type fluid machine of the present embodiment. FIG. 1 is a cross-sectional view showing the overall configuration, and FIG. 2 is a perspective view of the movable scroll viewed from the lap side.
As shown in FIG. 1, a scroll fluid machine 1 (hereinafter referred to as a scroll compressor) 1 according to the present embodiment includes a scroll unit 4 having a fixed scroll 2 and a movable scroll 3 which are arranged to face each other and mesh with each other. I have. The fixed scroll 2 has a bottom plate 2a and a spiral wrap 2b standing on the bottom plate 2a. As shown in FIG. 2, the movable scroll 3 has a bottom plate 3a and a spiral wrap 3b standing on the bottom plate 3a, like the fixed scroll 2.
The two

scrolls

2 and 3 mesh with each other, and the leading end of the wrap 2b of the fixed scroll 2 is close to the bottom plate 3a of the movable scroll 3, and the leading end of the wrap 3b of the movable scroll 3 is the fixed scroll 2. It arrange | positions so that it may adjoin to the baseplate 2a. Specifically, the

scrolls

2 and 3 are arranged such that the side walls of the

wraps

2b and 3b are partially in contact with each other with the circumferential angles of the

wraps

2b and 3b being shifted from each other.
Further,

tip seal grooves

2c and 3c are formed at the tip ends of the

wraps

2b and 3b of the

scrolls

2 and 3, respectively. The

chip seal grooves

2c and 3c have a generally concave cross-sectional shape and continuously extend in the spiral extending direction of the

wraps

2b and 3b. In the

chip seal grooves

2c and 3c, spiral chip seals 40 are respectively assembled in plan view.
Thus, by arranging the spiral tip seals 40 in a plan view in the

tip seal grooves

2c and 3c formed at the tip portions of the

wraps

2b and 3b of the

scrolls

2 and 3, respectively, A scroll compressor 1 is defined which partitions a working fluid working chamber 5 between the

wraps

2b and 3c.
Specifically, the working chamber 5 is formed in a crescent shape between the

wraps

2b and 3b. In the present embodiment, the

chip seal grooves

2c and 3c are “grooves” according to the present invention. Hereinafter, the tip seal 40 assembled in the tip seal groove 3c of the movable scroll 3 will be referred to as a movable-side tip seal 41, and the tip seal 40 assembled in the tip seal groove 2c of the fixed scroll 2 will be referred to as a fixed-side tip. This is called a seal 42. The shapes of the movable side tip seal 41 and the fixed side tip seal 42 will be described in detail later.
The movable scroll 3 is revolved around the central axis X1 of the fixed scroll 2 by a drive mechanism and a rotation prevention mechanism 30 described later, and rotation is prevented. Thereby, the working chamber 5 formed between the

wraps

2b and 3b is moved from the outer peripheral part (outer end part) of the

wraps

2b and 3b toward the center part, and the volume thereof is changed in the reduction direction. . Therefore, the working fluid (for example, refrigerant gas) taken into the working chamber 5 from the outer peripheral side of the

wraps

2b and 3b is compressed. Thus, in this embodiment, the scroll unit 4 compresses and discharges the working fluid introduced from the outer peripheral side of the scroll unit 4 in the working chamber 5.
In the case of an expander, the working chamber 5 is moved from the central part of the

wraps

2b and 3b toward the outer periphery, while its volume changes in the increasing direction, and from the central part side of the

wraps

2b and 3b. The fluid taken into the working chamber 5 is expanded. That is, in this case, the scroll unit 4 expands and discharges the working fluid introduced from the center side thereof in the working chamber 5.
The housing of the scroll compressor 1 includes, for example, a center housing 6 that encloses the scroll unit 4, a front housing 7 that is disposed on the front side, and a rear housing 8 that is disposed on the rear side.
In this embodiment, the center housing 6 is formed as a casing (outer shell) of the scroll unit 4 integrally with the bottom plate 2 a of the fixed scroll 2. However, the fixed scroll 2 and the center housing 6 may be separate members, and the fixed scroll 2 may be housed and fixed in the center housing 6. The center housing 6 is closed on the rear side by the bottom plate 2a and opened on the front side.
The front housing 7 is fastened to the opening side of the center housing 6 by bolts (not shown). The front housing 7 supports the movable scroll 3 in the thrust direction and houses a drive mechanism for the movable scroll 3.
Inside the front housing 7, a suction chamber 9 for the working fluid is formed. The suction chamber 9 is connected to a suction port (not shown) formed on the outer wall of the front housing 7.
The front housing 7 and the center housing 6 extend in a direction parallel to the compressor central axis (for example, the central axis X1 of the fixed scroll 2), and from the suction chamber 9 on the front housing 7 side to the scroll on the center housing 6 side. A fluid passage space 10 for guiding the working fluid is formed in the vicinity of the outer peripheral portions of the

laps

2b and 3b of the unit 4.
The rear housing 8 is fastened to the bottom plate 2a side of the fixed scroll 2 in the center housing 6 by an appropriate fastening means (not shown) such as a bolt, and the working fluid discharge chamber 11 is formed between the rear housing 8 and the back surface of the bottom plate 2a. Yes. A compressed fluid discharge hole 12 is formed at the center of the bottom plate 2 a of the fixed scroll 2, and a one-way valve 13 is attached to the discharge hole 12. The discharge hole 12 is connected to the discharge chamber 11 via a one-way valve 13. The discharge chamber 11 is connected to a discharge port (not shown) formed on the outer wall of the rear housing 8.
The working fluid is introduced into the suction chamber 9 in the front housing 7 from the suction port (not shown), and is wrapped from the outer peripheral side of the scroll unit 4 via the fluid passage space 10 of the front housing 7 and the center housing 6. It is taken into the working chamber 5 formed by the contact of 2b and 3b, and used for compression. The compressed fluid is discharged from a discharge hole 12 opened at the center of the bottom plate 2a of the fixed scroll 2 to a discharge chamber 11 in the rear housing 8, and from the discharge chamber 11 through the discharge port (not shown). Derived externally.
The front housing 7 faces the rear surface of the bottom plate 3a of the movable scroll 3 on the inner side of the outer peripheral portion fastened to the opening side of the center housing 6 by bolts (not shown), and applies the thrust force from the movable scroll 3 to the thrust plate 14. A thrust receiving portion 15 is provided for receiving via the.
Further, the front housing 7 rotatably supports a drive shaft 20 that forms the core of the drive mechanism of the movable scroll 3 at the center. One end portion side of the drive shaft 20 protrudes outside the front housing 7. A pulley 22 is attached to one end of the drive shaft 20 via an electromagnetic clutch 21. Accordingly, the drive shaft 20 is rotationally driven by the rotational driving force input from the pulley 22 via the electromagnetic clutch 21. The other end portion side of the drive shaft 20 is connected to the movable scroll 3 via a crank mechanism.
In the present embodiment, the crank mechanism is eccentrically attached to a cylindrical boss portion 23 formed on the back surface of the bottom plate 3a of the movable scroll 3 and a crank 24 provided at the end of the drive shaft 20 in an eccentric state. And a bush 25. The eccentric bush 25 is fitted inside the boss portion 23 via a bearing 26. A balancer weight 27 is attached to the eccentric bush 25 so as to face the centrifugal force during the operation of the movable scroll 3.
The rotation prevention mechanism 30 is provided with a plurality (for example, four) of rotation prevention parts 33 including a circular hole 31 formed on the back surface of the bottom plate 3 a of the movable scroll 3 and a pin 32 engaged with the circular hole 31. Configured. Specifically, the circular hole 31 is formed in an end surface portion of the bottom plate 3a facing the thrust receiving portion 15 of the front housing 7. Further, the pin 32 protrudes on the thrust receiving portion 15 side of the front housing 7 and penetrates the thrust plate 14 to engage with the circular hole 31. The rotation preventing portions 33 are arranged at equal intervals along the circumferential direction in the vicinity of the outer peripheral edge of the back surface of the bottom plate 3 a of the movable scroll 3. If there are at least three rotation preventing portions 33, the movable scroll 3 can revolve around the axis of the fixed scroll 2 without rotating.
The operation of the scroll compressor 1 having such a configuration will be briefly described.
When the pulley 22 is rotated by a rotational driving force from the outside, the drive shaft 20 is rotated through the electromagnetic clutch 21, and the movable scroll 3 is rotated through the crank mechanism while the rotation preventing mechanism 30 prevents the rotation of the fixed scroll 2. Revolves around the axis. Due to the orbital revolving motion of the movable scroll 3, the fluid (refrigerant gas) is taken into the working chamber 5 between the

laps

2 b and 3 b of the scroll unit 4 from the suction port via the suction chamber 9 and the fluid passage space 10. The fluid compressed by the change in the volume of the chamber 5 is discharged from the discharge hole 12 at the center of the fixed scroll 2 to the discharge chamber 11. The fluid discharged into the discharge chamber 11 is led out to the outside through the discharge port.
Next, the tip seal 40 (movable side tip seal 41 and fixed side tip seal 42) of this embodiment will be described with reference to FIGS. FIG. 3 is a perspective view of the movable-side chip seal 41 and is shown with the contact end surface 40 a contacting the bottom plate 2 a of the fixed scroll 2 facing upward.
The movable-side chip seal 41 and the fixed-side chip seal 42 are each formed in accordance with the shape of the corresponding chip seal groove (3c, 2c). That is, as shown in FIGS. 2 and 3, the movable tip seal 41 is formed in a spiral shape in plan view in accordance with the shape of the tip seal groove 3 c of the movable scroll 3. The fixed-side chip seal 42 is formed in a spiral shape in plan view in accordance with the shape of the chip seal groove 2 c of the fixed scroll 2. In the following, when a common configuration is described for the movable side chip seal 41 and the fixed side chip seal 42, both the movable side chip seal 41 and the fixed side chip seal 42 are simply referred to as a chip seal 40.
The tip seal 40 has a shape in which the height position of the spiral central axis X2 in the extending direction continuously changes from one end side to the other end side in the spiral extending direction W. The spiral central axis X2 of the tip seal 40 extends parallel to the central axis X1 of the fixed scroll 2 shown in FIG. The tip seal 40 has elasticity that expands and contracts in the direction of extension of the spiral center axis X2 when an external force in the direction of extension of the spiral center axis X2 is applied. That is, the entire tip seal 40 functions as a spring that expands and contracts in the direction of extension of the spiral central axis X2. The tip seal 40 is assembled in the

tip seal grooves

2c and 3c and the tip seal bottom surface 40b facing the bottom surfaces 2d and 3d of the

tip seal grooves

2c and 3c is in the spiral extending direction W in a state where the external force is not applied. It is formed so as to be located in the

chip seal grooves

2c and 3c over the whole from one end to the other end. Further, in the state where no external force is applied, the tip seal 40 protrudes from the

front end surfaces

2e and 3e of the corresponding

wraps

2b and 3b with the contact end surface 40a extending from one end to the other end in the spiral extending direction W. Is formed.
In this embodiment, the chip seal 40 is formed to have a rectangular cross section having a substantially constant thickness and a width corresponding to the groove width of the corresponding

chip seal grooves

2c, 3c, and as a whole in a spiral shape. Is formed.
Specifically, the tip seal 40 is assembled into the corresponding

tip seal grooves

2c and 3c and the tip seal bottom surface 40b is in the spiral extending direction outer end portion W1 side to the central portion W2 side in a state where the external force is not loaded. The corresponding

tip seal grooves

2c and 3c are wound in a spiral shape away from the bottom surfaces 2d and 3d.
That is, the movable side chip seal 41 will be described in detail with reference to FIG. 3. In the movable side chip seal 41, the chip seal bottom surface 40b facing the bottom surface 3d of the chip seal groove 3c is swirled in a state where the external force is not applied. It forms so that it may leave | separate from the bottom face 3d as it goes to the center part W2 side from the extending | stretching direction outer end part W1 side. Although not shown, the fixed-side tip seal 42 has a tip seal bottom surface 40b opposed to the bottom surface 2d of the tip seal groove 2c in a state where the external force is not applied, and a central portion W2 from the outer end W1 side in the spiral extending direction. It forms so that it may leave | separate from the bottom face 2d as it goes to the side.
Next, taking the movable-side chip seal 41 as an example, the change in the height position, the assembled state, and the used state of the chip seal 40 will be described in detail with reference to FIGS.
4 to 6 show cross sections of the movable-side chip seal 41 at positions a to h shifted in the spiral extending direction W shown in FIG. Specifically, FIG. 4 is a conceptual diagram for explaining the change in the height position at a to h of the movable side tip seal 41, and FIG. 5 is an assembled state of the movable side tip seal 41 in the tip seal groove 3c. FIG. 6 is a conceptual diagram showing a change in pressing force when the movable tip seal 41 is in use.
As shown in FIG. 4, when the tip seal bottom surface 40b at the outer end W1 in the spiral extension direction is a reference surface H0 (indicated by a two-dot chain line in the drawing) at the height position in the spiral central axis X2, 41 is formed so that the distance from the reference plane H0 increases as it goes from the outer end W1 side to the center W2 side (that is, from the a side to the h side) in the spiral extending direction in the single product state. Yes.
Further, as shown in FIG. 5, the movable tip seal 41 is assembled into the tip seal groove 3c in the assembled state, and the chip facing the bottom surface 3d of the chip seal groove 3c in a state where the external force is not loaded. The seal bottom surface 40b is formed so as to move away from the bottom surface 3d of the chip seal groove 3c as it goes from the a side to the h side. In this state, the surface on the bottom plate 2 a side of the movable tip seal 41 (that is, the contact end surface 40 a that contacts the bottom plate 2 a) protrudes above the front end surface 3 e of the wrap 3 b of the movable scroll 3. Further, in this assembled state with no external force, the movable tip seal 41 has the tip seal bottom surface 40b positioned in the tip seal groove 3c from the one end to the other end in the spiral extending direction W, and the contact The contact end surface 40a is formed so as to protrude from the tip end surface 3e of the wrap 3b over the whole from one end to the other end in the spiral extending direction W. That is, the distance L (see FIG. 4) between the tip seal bottom surface 40b and the reference surface H0 that is farthest from the reference surface H0 is smaller than the groove depth D (see FIG. 5) of the tip seal groove 3c. (L <D).
As shown in FIG. 6, the movable-side chip seal 41 is in use, for example, its abutting end surface 40 a abuts against the bottom plate 2 a of the fixed scroll 2 and its tip-sealed bottom surface 40 b is the tip of the movable scroll 3. It is in contact with the bottom surface 3d of the seal groove 3c. In this use state, the movable-side tip seal 41 is contracted from the external force no-load state (free state) shown in FIGS. 4 and 5 in the spiral central axis X2 extending direction, and the contact end surface 40a is moved from one end of the spiral extending direction W to the other. It protrudes from the front end surface 3e of the wrap 3b over the entire end. That is, the contraction margin of the movable tip seal 41 with respect to the direction of extension of the spiral central axis X2 increases as it goes from the outer end W1 side to the center W2 side (from the a side to the h side). As a result, as indicated by the upward arrow P in each cross section (a to h) in FIG. 6, the magnitude of the pressing force P with which the movable side chip seal 41 presses the bottom plate 2a of the fixed scroll 2 is determined by the spiral extending direction. The size increases from the outer end W1 side toward the central portion W2 side.
Although not shown, the change in the height position of the fixed-side tip seal 42 can be obtained by replacing the reference numeral “2a” shown in FIG. 4 with “3a” and the reference numeral “3d” with “2d”. Can be expressed conceptually. That is, the fixed-side chip seal 42 is also formed so that the distance from the reference plane H0 increases as it goes from the outer end portion W1 side in the spiral extending direction toward the central portion W2 side in a single product state.
Although not shown, regarding the assembled state of the fixed side chip seal 42, the reference numerals “2a” and “3d” and “3d” shown in FIG. By replacing with 2b and 2c respectively, it can be expressed conceptually. That is, in the assembled state, the fixed-side chip seal 42 is assembled into the chip seal groove 2c, and the chip seal bottom surface 40b facing the bottom surface 2d of the chip seal groove 2c is from the a side in a state where the external force is not loaded. The tip seal groove 2c is formed so as to move away from the bottom surface 2d toward the h side. In this state, the contact end surface 40a of the fixed-side chip seal 42 protrudes upward from the front end surface 2e of the wrap 2b. Further, in this assembled state with no external force, the fixed-side tip seal 42 has the tip seal bottom surface 40b positioned in the tip seal groove 2c from one end to the other end in the spiral extending direction W, and the The contact end surface 40a is formed so as to protrude from the tip end surface 2e of the wrap 2b over the whole from one end to the other end in the spiral extending direction W.
Further, although not shown, regarding the usage state of the fixed side tip seal 42, the reference numeral “2a” shown in FIG. 6 is replaced with “3a”, and the other reference numerals are replaced in the same manner as in the assembled state. Therefore, it can be expressed conceptually. In other words, in use, the fixed-side chip seal 42 has, for example, a contact end surface 40a that contacts the bottom plate 3a of the movable scroll 3, and a chip seal bottom surface 40b that contacts the bottom surface 2d of the chip seal groove 2c. . In this use state, the fixed-side tip seal 42 contracts from the no-load state (free state) in the spiral central axis X2 extending direction, and the contact end surface 40a extends from one end to the other end in the spiral extending direction W. It protrudes from the front end surface 2e of the wrap 2b. Therefore, the shrinkage allowance of the fixed-side chip seal 42 in the direction of extension of the spiral central axis X2 increases from the outer end W1 side in the spiral extension direction toward the central portion W2. As a result, the magnitude of the pressing force P with which the fixed side tip seal 42 presses the bottom plate 3a of the movable scroll 3 is also similar to the movable side tip seal 41 from the outer end W1 side in the spiral extending direction to the central portion W2 side. It gets bigger as you go.
According to the scroll compressor 1 according to the present embodiment, the tip seal 40 (movable tip seal 41, fixed tip seal 42) has a height position in the direction of extension of the spiral central axis X2 from the one end side of the spiral extension direction W. Since it has a shape that continuously changes toward the other end side, the height position of the tip seal 40 in a portion corresponding to a specific region that needs to be improved in the sealing performance of the scroll unit 4 is higher than other portions. Thus, the tip seal 40 can be formed. As a result, the pressing force from the tip seal 40 to the

bottom plates

2a and 3a in the specific region of the scroll unit 4 becomes higher than the pressing force in other regions, and the sealing performance for the specific region can be improved.
Further, the tip seal 40 is configured to expand and contract in the spiral center axis X2 extending direction (that is, the center axis X1 extending direction of both scrolls) when an external force in the spiral center axis X2 extending direction is applied. For this reason, each of the movable side tip seal 41 and the fixed side tip seal 42 functions as a spring that expands and contracts in the extending direction of the spiral central axis X2. As a result, even if an error (manufacturing error) occurs between the actual clearance and the target clearance in the extending direction of the central axis X1 (that is, X2) between the

scrolls

2 and 3, the error is detected by the tip seal 40. Can be absorbed within the range of expansion / contraction allowance in the extending direction of the spiral central axis X2. Therefore, it is not necessary to initialize the clearance with high accuracy.
As shown in FIG. 5, the tip seal 40 is assembled into the

tip seal grooves

2c and 3c and the bottom surface 2d of the

tip seal grooves

2c and 3c is not loaded with an external force in the direction of extension of the spiral central axis X2. The chip seal bottom surface 40b facing 3d is formed so as to be located in the corresponding

chip seal grooves

2c and 3c over the whole from one end to the other end in the spiral extending direction W. That is, the tip seal 40 is formed such that the distance L is smaller than the groove depth D of the

tip seal grooves

2c and 3c (L <D). In other words, the tip seal 40 is formed with the height position restricted so that the entire tip seal bottom surface 40b facing the bottom surfaces 2d and 3d is located in the

chip seal grooves

2c and 3c. As a result, the tip seal 40 is formed in a shape in which the height position in the direction of extension of the spiral central axis X2 changes in a free state where no external force is applied, but when assembled into the

tip seal grooves

2c and 3c, The entire chip seal bottom surface 40b can be simultaneously disposed in the

chip seal grooves

2c and 3c. Therefore, the chip seal 40 can be assembled to the

chip seal grooves

2c and 3c in the same procedure as the conventional planar chip seal.
This assembly will be described in detail with reference to FIGS.
FIG. 7 is a side view of a tip seal 40 ′ produced by making the distance L of the tip seal 40 larger than the depth D of the

tip seal grooves

2c and 3c, for example. FIG. 8 is a conceptual diagram showing an assembled state of the chip seal 40 ′ shown in FIG. 7 to the

chip seal grooves

2c and 3c, and FIG. 9 is a conceptual diagram showing a usage state of the chip seal 40 ′ shown in FIG. FIG.
As shown in FIG. 7, the tip seal 40 ′ (L> D) is manufactured with a larger amount of change in height (ie, distance L) than the tip seal 40 (L <D) in this embodiment. Has been. When this chip seal 40 ′ is assembled to the chip seal groove 3c (2c), as shown in FIG. 8, only a part (a to c in the figure) of the chip seal bottom surface 40′b is inserted into the chip seal groove 3c ( 2c), and the remaining portions (d to h in the figure) are not located in the tip seal groove 3c (2c) and are in a free state. And in the state of FIG. 8, it is necessary to assemble so that both the

scrolls

2 and 3 may mesh | engage. At the time of this assembly, the contact end surface 40a of the chip seal 40 'is pressed by the bottom plate 2a (3a), and the distance L is reduced. However, at the time of this assembly, the operator visually confirms whether the free part (the remaining part) of the chip seal 40 'is normally assembled in the chip seal groove 3c (2c). It is impossible (or difficult) to do. Therefore, as shown in FIG. 9, for example, the two

scrolls

2, 3 in a state where the tip seal bottom surface 40'b side edge of the chip seal 40 'is in contact with the tip surface 3e (2e) of the chip seal groove 3c (2c). Is assumed to be fastened. In this case, the remaining portions (d to h) of the chip seal 40 ′ are not normally assembled in the chip seal groove 3c (2c) and may be damaged as shown in FIG. Is done. Further, in the state of FIG. 9, it is assumed that a gap is generated between the contact end face 40a and the bottom plate 2a (3a) in a part (ac) of the chip seal 40 ′. In other words, if the chip seal is manufactured with L> D set, problems such as poor assembly, breakage, and poor seal may occur.
In this regard, since L <D is set in the chip seal 40 according to the present embodiment, as described above, the entire chip seal bottom surface 40b is attached to the

chip seal grooves

2c and 3c as described above. At the same time, it can be disposed in the

tip seal grooves

2c, 3c. Therefore, in this state, the

scrolls

2 and 3 are assembled, and as shown in FIG. 6, the chip seal 40 can be used in a state of being normally assembled in the chip seal groove 3c (2c). it can. That is, it is possible to reliably prevent the occurrence of problems such as the above-described assembly failure, breakage, and seal failure.
In this way, the seal of a specific region of the scroll unit 4 is reduced while reducing the management accuracy of the clearance in the direction of extension of the central axis X1 between the

scrolls

2 and 3 without reducing the workability of assembling the tip seal 40. It is possible to provide a scroll compressor 1 as a scroll type fluid machine capable of improving the performance.
Further, in this embodiment, the tip seal 40 is assembled into the

tip seal grooves

2c and 3c and the tip seal bottom surface 40b is in the spiral extending direction outer end portion W1 side to the central portion W2 side in a state where the external force is not loaded. The

tip seal grooves

2c and 3c are wound in a spiral shape away from the bottom surfaces 2d and 3d. Thereby, it is possible to easily construct a seal structure using the tip seal 40 suitable for improving the sealing performance of the working chamber 5 in the central portion (h side in FIG. 4) of the scroll unit 4, that is, the high pressure region. it can.
In this embodiment, the tip seal 40 has a spiral shape in which the tip seal bottom surface 40b is spaced apart from the bottom surfaces 2d and 3d of the

tip seal grooves

2c and 3c as the tip seal bottom surface 40b moves from the outer end W1 side in the spiral extending direction toward the center portion W2. However, the present invention is not limited to this.
For example, as shown in FIGS. 10 and 11 shown as an example of the movable side chip seal 41, the chip seal 40 is assembled in the

chip seal grooves

2c and 3c and the chip is not loaded with the external force. The seal bottom surface 40b may be wound in a spiral shape approaching the bottom surfaces 2d and 3d of the

chip seal grooves

2c and 3c as it goes from the outer end W1 side in the spiral extending direction toward the center portion W2. In the case of the first modification shown in FIGS. 10 and 11, as shown in FIG. 12, the sealing performance of the working chamber 5 in the outer peripheral portion (a side) of the scroll unit 4, that is, the low pressure region, is improved by the tip seal 40. Can be made. As a result, a seal structure using the tip seal 40 suitable for improving the compression capability in the low-speed rotation region can be easily constructed.
Further, in the present embodiment and the first modification, the tip seal 40 is lifted (FIGS. 4 and 5) or lowered (FIGS. 10 and 10) in one direction from the outer end W1 side in the spiral extending direction toward the center W2 side. 11) It is assumed that it is formed in a spiral shape. However, the present invention is not limited to this, and a change point that changes from an upward trend to a downward trend may be provided. Specifically, for example, as shown in FIGS. 13 and 14 showing an example of the movable tip seal 41, the tip seal 40 is assembled in the

tip seal grooves

2c and 3c and the external force is not loaded. Thus, at a predetermined position in the spiral extension direction W (a predetermined position between d and e in the figure), the tip seal bottom surface 40b changes from a tendency to approach the

bottom surface

2d, 3d of the

chip seal grooves

2c, 3c to a tendency to leave. It may be wound to have a point. In the case of the modification 2 shown in FIGS. 13 and 14, as shown in FIG. 15, the outer peripheral portion (a side) and the central portion (h side) of the scroll unit 4, that is, the working chambers in the low pressure region and the high pressure region. 5 can be improved. Thereby, it is possible to easily construct a seal structure using the tip seal 40 capable of improving the compression capability in the low-speed rotation region while improving the sealing performance in the high-pressure region. In the case of the second modification, when the tip seal bottom surface 40b is formed so as to change from the tendency to approach the bottom surfaces 2d and 3d of the

chip seal grooves

2c and 3c at the changing point of the chip seal 40. Not limited to this, the

tip seal grooves

2c and 3c may be formed so as to change from a tendency to move away from the bottom surfaces 2d and 3d. The change points may be provided at a plurality of locations separated in the spiral extension direction W.
Further, in the present embodiment and the first modification, the

tip seal grooves

2c and 3c are formed at the front ends of the

wraps

2b and 3b of the

scrolls

2 and 3, respectively. What is necessary is just to be formed in at least one of the 2 and 3

wraps

2b and 3b. That is, the tip seal 40 may be disposed in the

tip seal grooves

2c and 3c formed at the tip of at least one

lap

2b and 3b of the

scrolls

2 and 3. Further, as in the present embodiment, when the chip seals are disposed in the

chip seal grooves

2c and 3c of the

scrolls

2 and 3, respectively, the chip seal 40 according to the present embodiment is employed for only one chip seal, and the other As for the tip seal, a flat tip seal similar to the conventional one may be adopted.
In the present embodiment, the scroll type fluid machine 1 is described as applied to a compressor. However, the present invention is not limited to this, and the scroll fluid machine 1 can also be applied to an expander.
The preferred embodiments of the present invention and the modifications thereof have been described above, but the present invention is not limited to the above-described embodiments and modifications, and various modifications and changes can be made based on the technical idea of the present invention. Is possible.

1 Scroll type compressor (Scroll type fluid machine)
2 Fixed scroll 2a Bottom plate 2b Wrap 2c Tip seal groove (groove)
3 Movable scroll 3a Bottom plate 3b Wrap 3c Chip seal groove (groove)
4 Scroll unit 5 Working chamber (sealed space)
40 Tip seal 40b Tip seal bottom surface 41 Movable tip seal 42 Fixed tip seal X2 Centrifugal center axis W Centrifugal extension direction W1 Centrifugal extension direction outer end W2 Centrifugal extension direction center

Claims

A fixed scroll and a movable scroll each having a bottom plate and a spiral wrap standing on the bottom plate are provided, and in a groove formed at the tip of at least one of the scrolls. A scroll type fluid machine that divides a working chamber of working fluid between the laps of both scrolls by disposing a spiral tip seal in plan view,
The tip seal is
The height position of the spiral central axis extending direction has a shape continuously changing from one end side to the other end side in the spiral extending direction,
When an external force in the spiral central axis stretching direction is loaded, it expands and contracts in the spiral central axis stretching direction,
Formed so that the bottom surface of the chip seal facing the bottom surface of the groove is located in the groove from one end to the other end in the spiral extending direction in a state where it is assembled in the groove and the external force is not applied. Scroll type fluid machine.
When the tip seal is assembled into the groove and the external force is not applied, the tip seal bottom surface is spirally wound away from the bottom surface of the groove as it goes from the outer end side to the center side in the spiral extending direction. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine is wound into a shape.
The tip seal is assembled in the groove and the spiral seal approaches the bottom surface of the groove as the bottom surface of the tip seal moves from the outer end side to the center side in the spiral extending direction in a state where the external force is not applied. The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine is wound into a shape.
The tip seal is assembled in the groove and the external force is not applied, and at a predetermined position in the spiral extension direction, the tip seal bottom surface tends to approach from the tendency to move away from the bottom surface of the groove, or The scroll type fluid machine according to claim 1, wherein the scroll type fluid machine is wound so as to have a changing point that changes from a tendency to approach the bottom surface of the groove to a tendency to leave.
The scroll fluid machine according to any one of claims 1 to 4, wherein the scroll unit having the fixed scroll and the movable scroll compresses and discharges the working fluid in the working chamber.
5. The scroll fluid machine according to claim 1, wherein the scroll unit having the fixed scroll and the movable scroll expands and discharges the working fluid in the working chamber.
The grooves are respectively formed at the end portions of the wraps of the scrolls.
The scroll type fluid machine according to any one of claims 1 to 6, wherein the tip seal is disposed in each of the wraps.