WO2018211567A1

WO2018211567A1 - Scroll-type fluid machine

Info

Publication number: WO2018211567A1
Application number: PCT/JP2017/018232
Authority: WO
Inventors: 小林　義雄; 坂本　晋; 翔渡邉
Original assignee: 株式会社日立産機システム
Priority date: 2017-05-15
Filing date: 2017-05-15
Publication date: 2018-11-22
Also published as: JP6792072B2; CN110621879B; CN110621879A; JPWO2018211567A1

Abstract

Provided is a scroll-type fluid machine with which damage to spiral laps, etc., due to the movement of a bottom plate can be reduced, and longer life can be achieved. This scroll-type fluid machine comprises a fixed scroll in which a spiral lap part is provided to a bottom land of a panel, and a swirling scroll which is provided facing the fixed scroll and in which a spiral lap part is provided to a bottom land of a panel so as to form a plurality of compression chambers with the lap part of the fixed scroll. In at least one lap part between the lap parts of the swirling scroll and the fixed scroll, a recessed groove extending along the tooth tip of the lap part is formed, a seal member that slides against the bottom land of the scroll facing into the recessed groove is mounted, and a wear-resistant plate-shaped member is disposed on the bottom land facing the seal member. The plate-shaped member is configured so as to have a prescribed gap in the spiral winding direction with the disposed spiral lap part, and is configured so that the plate-shaped member and the spiral lap parts do not come into contact in the spiral winding direction due to the inner line side or outer line side of the spiral lap parts of the scroll and the side surface of the plate-shaped member coming into contact and ceasing to rotate.

Description

Scroll type fluid machine

The present invention relates to a scroll fluid machine suitable for use in, for example, an air compressor or a vacuum pump.

In Patent Document 1, “a fixed scroll member with a fixed spiral wrap standing on one surface of a fixed end plate, and a swirl spiral wrap standing on one surface of a rotating end plate, A revolving scroll member that is combined so as to be driven to revolve orbit while being blocked to form a compression chamber, and a fixed seal wrap and a tip seal groove provided on each wrap tip surface of the swirl spiral wrap are fitted and mounted. A bottom plate in which the tip seal member is slidably contacted with a tooth bottom surface of the spiral wrap in front of either or both of the fixed scroll member and the orbiting scroll member. And a back-up material having a melting point lower than that of the tip seal member is provided on the back side of the bottom plate. Scroll compressor characterized in that it is. "Is described as (claim 6).

Patent Document 2 states that “a fixed scroll and a movable scroll in which a lap formed by a spiral curve is integrally formed on the first end plate are engaged with each other with the wrap inside, and the movable scroll is swung with respect to the fixed scroll. In the scroll fluid machine, the second made of a metallic rigid body having a through hole formed by a spiral curve having the same shape as the two scrolls or one of the scroll wraps and having higher surface accuracy than the first end plate. A scroll fluid machine in which an end plate is disposed on the first end plate, and the corner chamfer of the second end plate surface on the side in contact with the first end plate is made larger than the corner chamfer of the surface facing the counterpart wrap. "(Claims).

JP 2008-163896 JP-A-2-70988

Patent Document 1 and Patent Document 2 describe a scroll compressor in which a bottom plate on which a tip seal member is slidably contacted is installed on the tooth bottom surface of a spiral wrap of either or both of a fixed scroll and a turning scroll. ing. However, Patent Document 1 or Patent Document 2 does not consider that the bottom plate moves and the spiral wrap, the tip seal member, and the like are damaged.

Therefore, an object of the present invention is to provide a scroll type fluid machine that can reduce damage such as a spiral wrap caused by the movement of the bottom plate and achieve a long life.

An example of the scroll type fluid machine of the present invention for solving the above-described problem is provided with a fixed scroll provided with a spiral wrap portion on the tooth bottom surface of the end plate, and provided facing the fixed scroll, A swirl scroll provided with a spiral wrap portion so as to form a plurality of compression chambers between the fixed scroll and the wrap portion of the fixed scroll on the tooth bottom surface of the end plate, the swivel scroll and the fixed scroll of the wrap portion of the fixed scroll At least one of the wrap portions is formed with a concave groove extending along the tooth tip of the wrap portion, and a seal member that is in sliding contact with the bottom surface of the scroll facing the inside of the concave groove is mounted, and is opposed to the seal member. A scroll-type fluid machine in which a wear-resistant plate-like member is disposed on the bottom surface of the tooth,
The plate-like member is configured to have a predetermined gap in the spiral winding direction with the spiral wrap portion disposed,
When the inner line side or the outer line side of the spiral wrap part of the scroll and the side surface of the plate member come into contact with each other and stop rotating, the plate member and the spiral wrap part are spirally wound. It is comprised so that it may not touch.

Another example of the scroll type fluid machine according to the present invention is a fixed scroll having a spiral wrap portion provided on the tooth bottom surface of the end plate, and a fixed scroll provided opposite to the fixed scroll. A orbiting scroll provided with a spiral wrap portion so as to form a plurality of compression chambers between the wrap portion of the fixed scroll and at least one of the wrap portion of the orbiting scroll and the fixed scroll. A concave groove extending along the tooth tip of the lap portion is formed in the portion, and a seal member that is in sliding contact with the tooth bottom surface of the opposing scroll is mounted in the concave groove, and the tooth bottom surface facing the seal member is attached to the groove portion. Is a scroll fluid machine in which a wear-resistant plate-like member is disposed,
The plate-like member is fixed to the fixed scroll or the orbiting scroll with a screw.

According to the present invention, in the scroll type fluid machine, damage such as a spiral wrap caused by the movement of the bottom plate can be reduced, and a long life can be realized.

It is a longitudinal cross-sectional view which shows the scroll type air compressor of Example 1 of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is an expansion | deployment perspective view which shows the scroll type air compressor of Example 1 of this invention. It is the elements on larger scale near the chip seal of FIG. It is a figure which shows the chip seal member of FIG. FIG. 2 is a partially enlarged view in the YY direction of FIG. 1. FIG. 2 is a cross-sectional view in the YY direction of FIG. It is a figure which shows the relationship between a bottom plate and a lap | wrap part at the time of the normal rotation of the turning scroll of Example 1. FIG. It is a figure which shows the relationship between a bottom plate and a lap | wrap part at the time of reverse rotation of the turning scroll of Example 1. FIG. It is a figure which shows the fixing position of the bottom plate of Example 2 of this invention. It is a figure which shows the other fixed position of the bottom plate of Example 2 of this invention. It is a figure which shows the positional relationship of a bottom plate and a chip seal member. It is a figure which shows the positional relationship of the bottom plate of Example 3, and a chip seal member. It is a figure which shows another positional relationship between a bottom plate and a chip seal member for comparison. It is an expansion | deployment perspective view which shows the scroll type air compressor of Example 4 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, components that are the same in each drawing are given the same reference numerals as much as possible, and redundant descriptions thereof are omitted.

The case where the scroll type fluid machine according to the first embodiment of the present invention is used as an air compressor based on FIGS. 1 to 8 will be described as an example.

FIG. 1 shows a longitudinal sectional view of a scroll type air compressor in Embodiment 1 of the present invention. FIG. 2 is a developed perspective view of the scroll type air compressor. In the figure, reference numeral 1 denotes a fixed scroll that constitutes a part of the casing of the scroll type air compressor. The fixed scroll 1 is provided with an opening end side of a casing main body 47 (FIG. 2) formed in a generally covered cylindrical shape. It is fixed to the opening end side so as to cover. The fixed scroll 1 is made of, for example, an aluminum alloy, and has a disc-shaped end plate 2 disposed so that the center thereof coincides with an axis O1-O1 of a drive shaft 17 to be described later. The spiral wrap portion 3 erected on the tooth bottom surface 2 A, and a support portion 4 that is positioned on the outer peripheral side of the end plate 2 and is formed in a cylindrical shape so as to surround the wrap portion 3. .

Further, as shown in FIG. 5, the wrap portion 3 of the fixed scroll 1 is formed in a spiral shape of, for example, about three and a half turns, with the inner peripheral side being the winding start end and the outer peripheral side (not shown) being the winding end end. Has been. The tooth tip 3A of the wrap portion 3 is spaced apart from the tooth bottom surface 10A of the orbiting scroll 9 described later with a minute clearance C as shown in FIG.

Reference numeral 5 denotes a concave groove formed on the tooth tip 3A side of the wrap portion 3, and the concave groove has a U-shaped cross section at the middle portion in the width direction on the tooth tip 3A side of the wrap portion 3 as shown in FIG. The bottom surface 5A of the concave groove 5 and the left and

right side surfaces

5B and 5C extend from the winding start end to the winding end end along the spiral shape of the wrap portion 3. A chip seal 6 which will be described later is mounted in the concave groove 5 so as to seal between the bottom plate 10B formed between the tooth bottom surface 10A of the orbiting scroll 9 which is the counterpart.

Reference numeral 6 denotes a chip seal as a seal member mounted in the concave groove 5 of the lap portion 3, and the chip seal 6 has a rectangular cross section made of, for example, an elastic resin material as shown in FIG. 4. It is formed as a long tip seal and extends in a spiral shape along the length direction of the concave groove 5.

Here, as shown in FIG. 3, the tip seal 6 is slidably contacted with a lower side surface 6A as a pressure receiving surface that comes into contact with the bottom surface 5A of the concave groove 5, and with the lower side surface 6A in the vertical direction and facing the opposite bottom plate 10B. The upper side surface 6B is composed of an inner side surface 6C and an outer side surface 6D positioned on the inner side and the outer side in the radial direction of the spiral tip seal 6. The lower side surface 6A and the inner side surface 6C have lower lip portions 7 described later. The inner lip portions 8 are integrally formed. The chip seal 6 has inner and

outer surfaces

6C and 6D inserted into the groove 5 with a slight gap so that the lower surface 6A abuts the bottom surface 5A of the groove 5, and from the bottom surface 5A of the groove 5 It is possible to float toward the bottom plate 10B of the orbiting scroll 9 as the opponent.

Reference numerals

7, 7,... Denote lower lip portions as bottom lip portions formed at predetermined intervals in the length direction on the lower surface 6A of the chip seal 6, and each lower lip portion 7 is shown in FIG. As described above, the lower surface 6A of the chip seal 6 is integrally formed by incising obliquely at a predetermined interval, and the tip end side thereof becomes a free end so as to expand from the lower surface 6A.

Reference numerals

8, 8,... Denote inner lip portions as side lip portions of the tip seal 6, and each inner lip portion 8 is formed in substantially the same manner as the lower lip portion 7, and as shown in FIG. The inner side surface 6C is integrally formed by cutting diagonally at a predetermined interval, and the tip end side thereof is a free end so as to expand from the inner side surface 6C.

In FIG. 1, reference numeral 9 denotes a turning scroll provided in the casing body so as to be capable of turning in opposition to the fixed scroll 1, and the turning scroll 9 is made of, for example, aluminum alloy or the like, and the surface side is a tooth bottom surface 10A. End plate 10 formed in a disc shape and a wrap formed in a spiral shape in the same manner as the wrap portion 3 of the fixed scroll 1, standing from the tooth bottom surface 10 A of the end plate 10 toward the end plate 2 of the fixed scroll 1. The boss portion 12 is provided at the center of the rear surface of the end plate 10, and the boss portion 12 is rotatably attached to a crank of a drive shaft 17 described later.

Here, the wrap portion 11 of the orbiting scroll 9 is also formed in a spiral shape of, for example, about three and a half turns like the wrap portion 3 of the fixed scroll 1, and as shown in FIG. A concave groove 13 having a U-shaped cross section is formed from the bottom surface 13A and the left and right side surfaces 13B and 13C.

Reference numeral 14 denotes another tip seal as a seal member formed in the same manner as the tip seal 6 on the fixed scroll 1 side. The tip seal 14 is mounted in the concave groove 13 and is in contact with the bottom surface 13A. The upper side surface 14B is in sliding contact with the bottom plate 2B formed between 14A and the other tooth bottom surface 2A, and the inner side surface 14C and the outer side surface 14D are configured. Similarly to the tip seal 6, a lower lip portion 15 and an inner lip portion 16 are integrally formed on the lower side surface 14A and the inner side surface 14C of the tip seal 14, respectively.

In this embodiment, the recessed

grooves

5 and 13 and the tip seals 6 and 14 are provided on both the fixed scroll 1 and the orbiting scroll 9, but may be provided only on one of them.

Reference numeral 17 denotes a drive shaft that is rotatably provided on the casing main body. The drive shaft 17 is a crank whose front end extends into the casing main body, and the axis O2-O2 of the crank changes to the axis O1-O1 of the drive shaft 17. On the other hand, it is eccentric by a predetermined dimension δ. The boss 12 of the orbiting scroll 9 is turnably attached to the crank of the drive shaft 17 via an orbiting bearing 18, and the orbiting scroll 9 is orbited via a rotation prevention mechanism (not shown) or the like. Exercise is given.

Here, the lap portion 11 of the orbiting scroll 9 is arranged so as to be overlapped with the lap portion 3 of the fixed scroll 1 while being shifted by a predetermined angle in the circumferential direction, and as shown in FIG. A plurality of compression chambers R, R,... Having a crescent shape are defined. When the orbiting scroll 9 is orbited with respect to the fixed scroll 1, the volume of each compression chamber R is continuously reduced, and the air sucked from the suction port 19 described later is sequentially compressed. .

Reference numerals

19 and 20 denote suction ports and discharge ports formed in the fixed scroll 1. The suction port 19 is formed on the outer peripheral side of the end plate 2 so as to communicate with the outermost peripheral compression chamber R. The discharge port 20 The end plate 2 is drilled in the center of the end plate 2 so as to communicate with the innermost circumferential compression chamber R.

The scroll type air compressor has the above-described configuration, and its operation will be described next.

First, when the drive shaft 17 is rotationally driven from the outside of the casing by a drive source (not shown) such as a motor, this rotation is transmitted from the crank of the drive shaft 17 to the orbiting scroll 9 via the orbiting bearing 18, and the orbit. The scroll 9 performs a turning motion with a turning radius of a dimension δ around the axis O1-O1 of the drive shaft 17.

And each compression chamber R defined between each lap | wrap

parts

3 and 11 by this turning motion shrink | contracts continuously toward the center, compressing the air suck | inhaled from the suction port 19 sequentially, this compressed air Is discharged from the discharge port 20 toward an external air tank (not shown) or the like. Here, when the compression operation is started, a part of the compressed air enters the concave groove 5 (13) of the lap portion 3 (11) from the compression chamber R on the high pressure side in the direction of arrow A shown in FIG. The tip seal 6 (14) is lifted from the concave groove 5 (13) by receiving the pressure of the compressed air at the lower side surface 6A (14A) serving as a pressure receiving surface, and teeth of the facing end plate 10 (2) are opposed to each other. It is pressed toward the bottom plate 10B configured between the bottom surface 10A (2A). Thus, the upper surface 6B (14B) of the tip seal 6 (14) is in sliding contact with the counterpart bottom plate 10B (2B), and each compression chamber R defined between the

wrap portions

3 and 11 is hermetically sealed. .

Each of the lower lip portions 7 (15) has a groove 5 in the direction indicated by an arrow B in FIG. 5 from the compression chamber R on the inner peripheral side toward the compression chamber R on the outer peripheral side. (13) Due to the compressed air that has entered the inside, the tip side of each lower lip 7 (15) is pressed against the bottom surface 5A (13A) of the groove 5 (13), and the groove 5 (13) The space between the bottom surface 5A (13A) and the tip seal 6 (14) is hermetically sealed.

Further, each inner lip portion 8 (16) also has the tip side of each inner lip portion 8 (16) of one of the concave grooves 5 (13) due to the compressed air that has entered the concave groove 5 (13). The side surface 5B (13B) of the concave groove 5 (13) is pressed against the side surface 5B (13B) and the tip seal 6 (14) in an airtight manner, and the tip seal 6 (14) The outer side surface 6D (14D) is pressed against the other side surface 5C (13C), and the space between the two is hermetically sealed.

By the way, in the scroll type air compressor described above, when the orbiting scroll 9 is swung with respect to the fixed scroll 1, each compression chamber R becomes a high temperature state, and in particular, compression on the inner peripheral side (discharge port 20 side). Chamber R is at high temperature and pressure. Therefore, the fixed scroll 1 and the orbiting scroll 9 that define these compression chambers R need to improve the wear resistance and corrosion resistance of the surfaces of the tooth bottom surfaces 2A and 10A.

Therefore, in this embodiment, as shown in FIG. 2, the bottom plate 10 B is disposed between the spiral wrap portions 11 provided in the orbiting scroll 9. Similarly, a bottom plate 2 B is arranged between the spiral wrap portions 3 of the fixed scroll 1. The

bottom plates

2B and 10B are made of wear-resistant plate members, for example, stainless steel plates.

FIG. 6 shows a bottom plate 10B and a spiral wrap portion 11 provided on the orbiting scroll 9 side. The bottom plate 10B is provided with a spiral hole 10C into which the spiral wrap part 11 is inserted. The spiral wrap part 11 and the side surface of the hole 10C of the bottom plate 10B are substantially in the radial direction over the entire circumference. Has an almost constant gap. And in the winding end part of the lap | wrap part 11, the big clearance gap (delta) e is provided in the winding direction of a spiral. Here, the gap δe is an interval between the winding end portion 11E of the wrap portion 11 and the end 10E of the spiral hole 10C. Similarly, the winding start portion of the wrap portion 11 is also provided with a gap in the spiral winding direction.

Here, when the compressor operates and the orbiting scroll 9 performs the orbiting motion, the bottom plate 10B (2B) is pressed against the tip seal 6 (14), and the orbiting motion of the orbiting scroll 9 causes the tip seal 6 (14). It receives rotational force due to frictional force. Further, the bottom plate 10 B on the orbiting scroll side generates centrifugal force by the orbiting motion of the orbiting scroll 9, and therefore receives the centrifugal force at the base portion of the scroll wrap 11.

In order to improve the assemblability, the scroll wrap 11 (3) and the bottom plate 10B (2B) are configured with a predetermined radial gap, and the bottom plate 10B (2B) moves in the rotational direction in the gap. In this case, in particular, the bottom plate 10B configured on the tooth bottom surface 10A side of the orbiting scroll 9 needs to secure a large winding direction clearance (δe) at the winding end portion. When the gap δe becomes a small value, the winding end portion of the hole 10C of the bottom plate 10B comes into contact with and slides only on the winding end portion 11E of the scroll wrap 11, so that the surface pressure increases remarkably, and the scroll wrap winding end 11E There is a possibility that the end 10E of the hole 10C of the tooth base or the bottom plate 10B is greatly worn.

On the other hand, when the winding direction gap δe between the end 10E of the hole 10C of the bottom plate 10B and the end 10E of the scroll wrap is secured, the extension 11A and the bottom of the entire wrap of the orbiting scroll 9 are not the end of the winding. Since the side surface of the plate 10B comes into contact, the contact surface pressure can be suppressed, wear can be prevented, and reliability can be improved.

This relationship will be described with reference to FIGS. FIG. 7 shows a state in which the scroll air compressor rotates in the forward direction during normal operation. 7A is an overall view, FIG. 7B is an enlarged view showing a winding end portion, and FIG. 7C is an enlarged view showing a winding start portion. When the compressor rotates in the forward direction, the bottom plate 10B rotates in the direction of the arrow due to the orbiting motion of the orbiting scroll. However, as shown in the figure, the bottom plate 10B moves to the outside, and the extension line 11A of the lap portion 11 and the side surface of the bottom plate 10B. Makes a large contact and stops the rotation of the bottom plate. As shown in FIG. 7 (b), by ensuring a large winding direction gap δe at the end of winding of the wrap portion 11, the bottom plate before the end portion 11E of the wrap portion and the end 10E of the hole of the bottom plate come into contact with each other. The rotation of 10B can be stopped. At the winding start portion, as shown in FIG. 7C, the end of the bottom plate rotates in a direction away from the end portion of the wrap portion 11 at the time of forward rotation, so that they do not come into contact with each other.

FIG. 8 shows a state in which the scroll type air compressor rotates in the reverse direction. Rotating in the reverse direction is when the air pressure such as the discharge pipe is applied to the compressor after the compressor is stopped and the compressor rotates in the reverse direction. 8A is an overall view, FIG. 8B is an enlarged view showing a winding end portion, and FIG. 8C is an enlarged view showing a winding start portion. When the compressor rotates in the reverse direction, the bottom plate rotates in the direction of the arrow due to the orbiting motion of the orbiting scroll. However, as shown in the figure, the bottom plate 10B moves inward, and the outer line 11B of the lap portion 11 and the side surface of the bottom plate 10B The bottom plate 10B stops rotating with great contact. At the end of winding, as shown in FIG. 8 (b), the end 10E of the hole in the bottom plate rotates in a direction away from the end 11E of the wrap part 11, so that they do not contact each other. By ensuring a large winding-direction gap at the winding start portion at the winding start portion, rotation of the bottom plate can be stopped before the end portion of the wrap portion and the end of the hole of the bottom plate come into contact with each other.

According to the present embodiment, the bottom plate rotates and the side surface of the hole of the bottom plate and the inner line or the outer line of the lap part come into large contact with each other, and the rotation stops. Alternatively, since a large gap in the winding direction at the winding start portion of the wrap portion is secured, wear of the scroll wrap tooth root or the bottom plate can be prevented, and reliability can be improved.

Although the bottom plate 10B has been described above, the bottom plate 2B may also receive a rotational force, and the same effect can be expected by ensuring a large winding-direction gap at the winding start portion of the wrap portion 3, for example.

In Example 2, the

bottom plate

10B or 2B is fixed to the orbiting scroll or the fixed scroll with a fixing screw so that the

bottom plate

10B or 2B does not rotate.

FIG. 9 shows a scroll type air compressor according to the second embodiment. 9A shows the bottom plate 2B attached to the fixed scroll 1, and FIG. 9B shows the bottom plate 10B attached to the orbiting scroll 9. As shown in FIG.

As shown in FIG. 9A, the bottom plate 2 B is fixed to the fixed scroll 1 with the fixing screw 31. The place to be fixed with the screw is in the suction chamber, that is, in the dust seal that prevents dust from entering from the outside. Further, in order to prevent the wrap portion 11 of the orbiting scroll 9 from coming into contact with the fixing screw 31, it is assumed that the wrap portion 11 does not pass. And as shown to a figure, it is preferable to set it as the winding end vicinity of the extension of the fixed side lap | wrap part 3. FIG.

As for the orbiting scroll, the bottom plate 10B is fixed to the orbiting scroll 9 with the fixing screws 32 as shown in FIG. Similarly, the place to be fixed by the fixing screw 32 is in the suction chamber. Further, in order to prevent the wrap portion 3 of the fixed scroll 1 from contacting the fixing screw 32, the wrap portion 3 is not allowed to pass. And like the fixed scroll 1, as shown to a figure, it is preferable to set it as the winding end vicinity of the extension of the fixed side lap | wrap part 3. FIG.

FIG. 10 shows another example of the scroll type air compressor according to the second embodiment. FIG. 10A shows the bottom plate 10B attached to the orbiting scroll 9, and FIG. 10B shows an enlarged view of the center portion thereof.

10 (a) and 10 (b), the bottom plate 10B provided on the orbiting scroll 9 is fixed with a fixing screw 33 in the vicinity of the discharge port. Further, in order to prevent the wrap portion 3 of the fixed scroll 1 from contacting the fixing screw 33, the wrap portion 3 is not allowed to pass.

According to the present embodiment, the bottom plate 2B provided on the fixed scroll 1 or the bottom plate 10B provided on the orbiting scroll 9 is fixed with the fixing screw, so that the

bottom plates

10B and 2B can be prevented from rotating, and the scroll wrap. The wear of the root or bottom plate can be prevented and the reliability can be improved.

As described in the first embodiment, in the scroll type air compressor, the scroll wrap 11 (3) and the bottom plate 10B (2B) are configured with a predetermined radial gap in order to improve assemblability. The third embodiment is configured such that the sliding surface of the chip seal 6 does not fall off the bottom plate 10B even if the bottom plate 10B (2B) moves in the radial direction.

FIG. 11 is a diagram showing a general positional relationship between the bottom plate 10B (2B) and the tip seal member 6 (14), and is a partially enlarged view of FIG. In FIG. 11, the gap between the bottom plate and the scroll wrap is G, the gaps on both sides of the bottom plate 10B are g1 and g2, the tooth thickness of the scroll wrap is t, the turning radius of the orbiting scroll is ε, and the width of the bottom plate 10B is Wp. Then,
G = g1 + g2 = 2ε + t−Wp
It becomes.

FIG. 12 shows the positional relationship between the bottom plate 10B (2B) and the tip seal member 6 (14) of the third embodiment. When the tooth tip convex part width on one side of the wrap part 11 is w,
0 <G ≦ w
It is set to.
Since G ≦ w is set, the sliding surface of the tip seal 6 (14) does not fall off from the bottom plate 10B (2B) even when the bottom plate 10B (2B) moves all the way through the gap. Further, abnormal wear or the like of the tip seal 6 (14) does not occur. Further, since 0 <G, the bottom plate 10B (2B) can be easily attached and detached, and the replacement workability during maintenance is good.

FIG. 13 shows another positional relationship between the bottom plate 10B (2B) and the tip seal member 6 (14) for comparison. In this example, since w <G, when the bottom plate 10B (2B) moves to one side all the way through the gap, the sliding surface of the tip seal 6 (14) falls off the bottom plate 10B (2B). As a result, abnormal wear of the tip seal 6 (14) occurs.

According to the present embodiment, the tip seal sliding surface does not fall off from the bottom plate when the bottom plate moves all the way through the gap, so abnormal wear or the like of the tip seal may occur. Absent.

FIG. 14 shows a scroll type air compressor according to a fourth embodiment of the present invention. In Example 4, the bottom plate 10B (2B) is provided in an existing scroll air compressor that does not include the bottom plate 10B (2B).

When the

bottom plates

10B and 2B are provided in an existing scroll type air compressor not provided with a bottom plate, the distance between the casing 47 and the fixed scroll 2 is increased by the thickness of the

bottom plates

10B and 2B. Therefore, in the present embodiment, the

gap adjusting members

47A and 47B are provided between the casing 47 and the fixed scroll 2. The thicknesses of the

distance adjusting members

47A and 47B are preferably the thicknesses of the

bottom plates

10B and 2B. The

distance adjusting members

47A and 47B may be disposed on both sides with the rotation axis interposed therebetween.

According to the present embodiment, the bottom plate can be satisfactorily attached to an existing scroll type air compressor that does not include the bottom plate.

As mentioned above, although each Example was described taking the scroll type air compressor as an example, this invention is applicable to scroll-type fluid machines in general, such as an air compressor and a vacuum pump.

DESCRIPTION OF SYMBOLS 1 ...

Fixed scroll

2, 10 ...

End plate

3, 11 ... Wrap part 11E ... Wrap winding

end part

5, 13 ...

Groove

6, 14,

Chip seal

7, 15, ...・

Lower lip part

8, 16 ... Inner lip part 9 ... Orbiting

scroll

10B, 2B ... Bottom plate 10C ... Bottom plate hole 11A ... Extension line 11B of wrap part ... Lap part , Outer shaft 17, drive shaft 18, slewing bearing 19, suction port 20,

discharge port

31, 32, 33, fixing screw 47, casing 47 A, 47 B, dimension adjusting member

Claims

A fixed scroll in which a spiral wrap portion is provided on the tooth bottom surface of the end plate, and a plurality of compression chambers provided between the fixed scroll and the fixed scroll provided on the end surface of the end plate. A swivel scroll provided with a spiral wrap portion, and at least one lap portion of the orbiting scroll and the fixed scroll has a concave groove extending along a tooth tip of the wrap portion. A scroll type fluid machine formed and mounted with a seal member slidably contacting the bottom surface of the scroll facing the inside of the groove, and a wear-resistant plate-like member disposed on the bottom surface facing the seal member Because
The plate-like member is configured to have a predetermined gap in the spiral winding direction with the spiral wrap portion disposed,
When the inner line side or the outer line side of the spiral wrap part of the scroll and the side surface of the plate member come into contact with each other and stop rotating, the plate member and the spiral wrap part are spirally wound. A scroll type fluid machine characterized in that it is configured not to come into contact with the fluid.
The scroll fluid machine according to claim 1,
The scroll fluid machine according to claim 1, wherein the plate-like member and the spiral wrap portion of the scroll have a substantially constant gap in a radial direction.
The scroll fluid machine according to claim 2,
The gap in the winding direction of the winding end portion and the winding start portion of the wrap portion of the plate-like member is the rotational direction of the plate-like member in the radial gap between the plate-like member and the wrap portion. The scroll fluid machine is configured to be secured even when the radial gap is eliminated.
The scroll fluid machine according to claim 1,
The plate-like member is configured to have a predetermined gap in the spiral winding direction of the orbiting scroll disposed and the spiral winding direction,
At the time of normal rotation which is the normal operation of the scroll type fluid machine, the inner side of the spiral wrap portion of the orbiting scroll and the side surface of the plate-like member come into contact with each other to stop the rotation. A scroll type fluid machine configured such that the spiral wrap portion is not in contact with the spiral winding direction.
The scroll fluid machine according to claim 4, further comprising:
At the time of reverse rotation of the scroll fluid machine, the outer side of the spiral wrap portion of the orbiting scroll and the side surface of the plate-like member come into contact with each other and stop rotating, whereby the plate-like member and the spiral-shaped fluid machine are stopped. A scroll type fluid machine configured so as not to contact a wrap portion in a spiral winding direction.
The scroll fluid machine according to claim 1,
The plate-shaped member is configured to have a predetermined gap in the spiral winding direction of the fixed scroll disposed and the spiral winding direction,
When the inner line side or outer line side of the spiral wrap portion of the fixed scroll and the side surface of the plate member come into contact with each other and stop rotating, the plate member and the spiral wrap portion are spirally wound. A scroll type fluid machine characterized in that it is configured not to contact in a direction.
A fixed scroll in which a spiral wrap portion is provided on the tooth bottom surface of the end plate, and a plurality of compression chambers provided between the fixed scroll and the fixed scroll provided on the end surface of the end plate. A swivel scroll provided with a spiral wrap portion, and at least one lap portion of the orbiting scroll and the fixed scroll has a concave groove extending along a tooth tip of the wrap portion. A scroll-type fluid is formed, and a seal member that slides in contact with the bottom surface of the opposing scroll is mounted in the concave groove, and a wear-resistant plate-like member is disposed on the bottom surface facing the seal member. A machine,
The scroll fluid machine, wherein the plate-like member is fixed to the fixed scroll or the orbiting scroll with a screw.
The scroll fluid machine according to claim 7,
The scroll-type fluid machine, wherein the plate-like member is fixed with a screw in the suction chamber.
The scroll fluid machine according to claim 8,
The scroll-type fluid machine, wherein the plate-like member is fixed with a screw at a place where the lap portion does not pass.
The scroll fluid machine according to claim 7,
The scroll-type fluid machine, wherein the plate-like member on the fixed scroll side is fixed to the fixed scroll with a screw in the vicinity of the winding end of the extension line of the wrap portion of the fixed scroll.
The scroll fluid machine according to claim 7,
The scroll-type fluid machine, wherein the plate-like member on the orbiting scroll is fixed to the orbiting scroll with a screw in the vicinity of the winding end of the extension line of the fixed scroll.
The scroll fluid machine according to claim 7,
The scroll type fluid machine, wherein the plate-like member on the orbiting scroll side is fixed to the orbiting scroll with a screw in a discharge chamber.
The scroll fluid machine according to any one of claims 1 to 12,
A scroll type fluid machine characterized in that, together with the plate-like member, a dimension adjusting member having a thickness similar to that of the plate-like member is disposed on the mating surface of the casing and the fixed scroll.