JPH09256973A - Scroll type fluid machinery - Google Patents

Abstract

PROBLEM TO BE SOLVED: To air tightly seal each compression chamber from the inner diameter side of a lap part to an outer diameter side by a seal member so as to improve compressive performance surely by arranging the lap part on the inner diameter side part of the seal member, and arranging an elastic body on the outer diameter part. SOLUTION: Recessed grooves 5, 16 are formed on lap parts 3, 14 of a fixing scroll 1 and a turning scroll 12, and each seal member 6 is arranged in the recessed grooves 5, 16. The seal member 6 is constituted by a high pressure side seal 7 and a low pressure side seal 10. The high pressure side seal 7 is brought into sliding contact with counterpart gear bottom surfaces 13A, 2A, and also the lip part of the high pressure side seal 7 is brought into contact with insides of the recessed grooves 5, 16. The low pressure side seal 10 is push-pressed to an elastic body 11, and it is brought into sliding contact with the counterpart gear bottom surfaces 13A, 2A.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid machine suitable for use in, for example, an air compressor or a vacuum pump.

[0002]

2. Description of the Related Art Generally, a casing, a fixed scroll provided integrally with the casing and having a spiral wrap portion provided upright on the tooth bottom surface of an end plate, and a swivel in the casing facing the fixed scroll. And a revolving scroll in which a spiral wrap portion is erected so as to define a plurality of compression chambers on the tooth bottom surface of the end plate with the wrap portion of the fixed scroll, and is rotatable in the casing. And a drive shaft having a crank on the tip side connected to the orbiting scroll through an orbiting bearing, and at least one of the wrap portions of the fixed scroll and the orbiting scroll has the wrap portion. There is known a scroll type fluid machine in which a concave groove extending along the tooth top is formed and a seal body that is in sliding contact with the tooth bottom surface of the other side is mounted in the concave groove.

In a scroll type fluid machine according to this type of prior art, the base end side of the drive shaft projecting outside the casing is rotationally driven by a drive source such as a motor, and this rotation is performed from a crank of the drive shaft to a slewing bearing. To the orbiting scroll, and the orbiting scroll is caused to orbit around the drive shaft with a constant orbiting radius.

On the other hand, the end plate of the fixed scroll is formed with a discharge port located on the inner diameter side (winding start end side) of the spiral wrap portion and opening to the tooth bottom surface of the end plate.
A suction port opening to the tooth bottom is formed on the outer diameter side (winding end side) of the wrap portion. Further, the plurality of compression chambers defined between the wrap portions of the fixed scroll and the orbiting scroll communicate with the suction port on the outer diameter side between the wrap portions,
It is designed to communicate with the discharge port on the inner diameter side.

When used as, for example, a scroll type air compressor, the orbiting scroll is caused to orbit with respect to the fixed scroll so that each compression chamber is moved from the outer diameter side to the inner diameter side between the two wrap portions. The air is sucked through the suction port and compressed in succession in each compression chamber, and the compressed air is discharged from the discharge port toward an external air tank or the like.

In this case, a part of the compressed air enters from each compression chamber between the wall surface of the groove formed in the tooth tip of the wrap portion and the seal body, so that the pressure of the compressed air is changed. From the bottom side of the groove toward the tooth bottom of the other side. As a result, the seal body floats in the concave groove and comes into sliding contact with the tooth bottom surface of the other party, and hermetically seals between the compression chambers between the tooth top of the lap portion and the tooth bottom surface of the other party.

However, in the scroll type air compressor according to the above-mentioned prior art, the pressure of the compressed air that has entered the groove from each compression chamber is utilized to cause the seal body to float in the groove so that the tooth bottom surface of the other side is opposed. Since the seal body is only slidably contacting with the seal body, a gap is formed between the seal body and the wall surface (side surface and bottom surface) of the groove when the seal body floats toward the tooth bottom surface of the other side. . Then, this gap communicates from the inner diameter side of the wrap portion to the outer diameter side in the concave groove over the entire circumference in the spiral direction (circumferential direction), so that compressed air travels in this gap and reaches the inner diameter side. There is a problem in that the compression performance (compression efficiency) of the scroll air compressor decreases due to leakage from the compression chamber on the (high pressure side) toward the compression chamber on the outer diameter side (low pressure side).

In order to solve the above-mentioned problems, for example, Japanese Utility Model Laid-Open No. 2-147887 and Japanese Utility Model Publication No.
In the scroll type air compressors described in Japanese Patent No. 147888 and Japanese Patent Laid-Open No. 3-11101, a plurality of cuts are formed on the side surface and the bottom surface side of the seal body so as to be spaced apart from each other in the length direction of the seal body. A plurality of side surface lip portions and a plurality of bottom surface lip portions are integrally formed on the side surface and the bottom surface side of the seal body.

During the compression operation of the scroll air compressor, the side surface lip portion and the bottom surface lip portion are elastically deformed by the pressure of the compressed air that has entered the concave groove, and the tip side thereof is concave groove. By making sliding contact with the wall surface (side surface and bottom surface) of the groove, the gap formed by circumferential communication between the wall surface of the concave groove and the seal body is blocked, and the compression chamber on the high pressure side is transmitted through this gap. The compressed air is prevented from leaking from the low pressure side toward the low pressure side compression chamber.

[0010]

By the way, in the above-mentioned prior art, while pressing the seal body in the groove toward the mating tooth bottom surface by the pressure of the compressed air, each side lip portion and each side lip portion of the seal body are pressed. Since the bottom lip portion is pressed against the wall surface of the concave groove to seal between the compression chambers, in the compression chambers on the outer diameter side (low pressure side) in the initial stage of the compression stroke,
Since the pressure of compressed air is relatively low, the seal body cannot be pressed sufficiently against the tooth bottom surface of the mating member or the wall surface of the groove,
There is a problem that the sealing performance between the compression chambers is deteriorated and the compression performance of the scroll air compressor is deteriorated.

In particular, in each compression chamber near the suction port, the pressure of the compressed air is close to the atmospheric pressure, so that the seal body is floated to make sliding contact with the tooth bottom surface of the other party, or each lip portion is elastically deformed to form a concave shape. The pressure required to press against the wall surface of the groove cannot be obtained, and compressed air may leak between the compression chambers from the concave groove or the gap between the tooth bottom of the other side and the seal body, resulting in an efficient compression stroke. There is a problem that is not done.

The present invention has been made in view of the above-mentioned problems of the prior art. The present invention can reliably press the seal body from the bottom surface side of the groove toward the tooth bottom surface of the other side even on the outer diameter side of the wrap portion. An object of the present invention is to provide a scroll fluid machine in which each compression chamber can be reliably sealed by a seal body from the inner diameter side to the outer diameter side of the wrap portion, and the compression performance can be reliably improved.

[0013]

In order to solve the above-mentioned problems, the present invention provides a fixed scroll in which a spiral wrap portion is erected on the tooth bottom surface of an end plate, and is provided so as to face the fixed scroll. A swirl scroll in which a spiral wrap portion is erected on the tooth bottom surface of the end plate so as to define a plurality of compression chambers with the wrap portion of the fixed scroll; A scroll type fluid in which at least one of the wrap portions is formed with a groove extending along a tooth tip of the lap, and a seal body which is in sliding contact with the tooth bottom surface of the other side is mounted in the groove. In the machine, the inner diameter side portion which is the radial inner side of the seal body,
A plurality of lip portions that are formed apart from each other in the longitudinal direction of the seal body and are in elastic contact with the wall surface of the groove are provided, and the outer diameter side portion on the outer side in the radial direction of the seal body has the outer diameter. It is characterized in that an elastic body that presses the side portion against the tooth bottom surface of the other party is provided between the side portion and the bottom surface of the groove.

With this structure, the inner diameter side portion of the seal body uses the high-pressure compressed fluid that enters into the groove from each compression chamber on the inner diameter side and moves from the inside of the groove to the tooth bottom surface of the other side. It comes to float toward the surface. Then, due to this fluid pressure, the tip side of each lip portion comes into elastic contact with the wall surface of the groove, and the gap between the wall surface of the groove and the seal body can be blocked in the circumferential direction. It is possible to prevent the fluid from leaking from the high pressure side to the low pressure side compression chamber along the circumferential direction in the gap with the seal body. Further, since the outer diameter side portion of the seal body is pressed from the inside of the groove toward the mating tooth bottom surface by the elastic body, the outer diameter side portion of the seal body is slidably contacted with the mating tooth bottom surface without floating. Can be made.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 5 show the case where the scroll type fluid machine according to the first embodiment of the present invention is used as a scroll type air compressor.

In the figure, reference numeral 1 denotes a fixed scroll which is a part of the casing of the scroll type air compressor, and the fixed scroll 1 is an open end of a casing body (not shown) formed in a generally cylindrical shape with a lid. It is fixed to the open end side so as to cover the side. And the fixed scroll 1
Is a disk-shaped end plate 2 arranged so that its center coincides with an axis O1 -O1 of a drive shaft 17 described later, and the end plate 2
The spiral wrap portion 3 is erected on the tooth bottom surface 2A, and the support portion 4 is formed 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. There is.

As shown in FIG. 2, the wrap portion 3 of the fixed scroll 1 is formed in a spiral shape, for example, three windings before and after, with the innermost diameter end being the winding start end and the outermost diameter end being the winding end. ,
As shown in FIGS. 4 and 5, the tooth top 3A of the wrap portion 3 is slightly separated from the tooth bottom surface 13A of the orbiting scroll 12 described later with a clearance dimension C.

Reference numeral 5 denotes a concave groove formed on the tooth top 3A side of the lap portion 3. The concave groove 5 is, as shown in FIG.
A bottom surface 5A and a left side which are formed in a widthwise intermediate portion and have a cross section of a substantially U shape,
The 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. Then, a seal body 6 to be described later is mounted in the groove 5 so as to seal the gap with the tooth bottom surface 13A of the orbiting scroll 12 which is the counterpart.

Reference numeral 6 denotes a seal body mounted in the concave groove 5 of the wrap portion 3. The seal body 6 is an inner diameter side portion of the seal body 6 as shown in FIGS. A seal 7 and a low-pressure side seal 10 which will be described later and which is located radially outward of the high-pressure side seal 7 and is mounted in the groove 5 together with an elastic body 11 which will be described later. For example, it extends spirally before and after three rolls.

Reference numeral 7 denotes a high pressure side seal which is an inner diameter side portion of the seal body 6, and the high pressure side seal 7 is made of an elastic resin material excellent in wear resistance and slidability, such as polytetrafluoroethylene (PTFE). Fluorine resin, polyether sulfone (PES), polyphenylene sulfide (PP
S), polyetheretherketone (PEEK), liquid crystal polymer (LCP), polysulfone (PSF), or the like, which is formed as a long chip seal having a substantially rectangular cross section.

As shown in FIGS. 3 and 4, the high-pressure side seal 7 is formed with bottom surface lip portions 8 to be described later, and has a lower surface 7A as a pressure receiving surface which is pressed in the direction of arrow B by compressed air. The diameter of the spiral side high pressure side seal 7 is formed by forming an upper side surface 7B as a sliding contact surface that faces the lower side surface 7A in the vertical direction and is in sliding contact with the mating tooth bottom surface 13A, and each side surface lip portion 9 described later. The inner side surface 7C faces the side surface 5B of the concave groove 5 on the inner side in the direction, and the outer side surface 7D faces the side surface 5C of the concave groove 5 on the outer side in the radial direction of the high-pressure side seal 7.

Here, the high pressure side seal 7 is inserted in the concave groove 5 with the inner side surface 7C and the outer side surface 7D so that the lower side surface 7A is placed on the bottom surface 5A of the concave groove 5, The groove 5 extends from the innermost circumference (winding start) end side to the middle portion in the spiral direction. When part of the compressed air enters the groove 5 as described later, the high-pressure side seal 7 receives this pressure on the lower side surface 7A, and the orbiting scroll which is the opposite side from the bottom surface 5A of the groove 5. It is possible to float toward the tooth bottom surface 13A of the No. 12 tooth.

The lower surface 7A of the high pressure side seal 7 is
The bottom surface lip portions are integrally formed with the bottom surface lip portions 8 as shown in FIG. 3, and the bottom surface lip portions 8 are formed as thin lip portions by obliquely cutting the lower side surface 7A at predetermined intervals in the longitudinal direction. The tip end side is a free end and is designed to expand from the lower side surface 7A toward the inner peripheral end side of the high pressure side seal 7. Then, the tip end side of each bottom surface lip portion 8 elastically contacts the bottom surface 5A of the concave groove 5 so that the bottom surface 5A of the concave groove 5 and the high-pressure side seal 7 are circumferentially (extension of the concave groove 5). It is configured to shut off by (direction).

.. are internal surfaces 7C of the high-pressure side seal 7.
The side surface lip portions are integrally formed with each other, and each side surface lip portion 9 is formed as a thin-walled lip portion by obliquely cutting the inner side surface 7C like each bottom surface lip portion 8 as shown in FIG. The tip end side of each side surface lip portion 9 becomes a free end and elastically contacts the side surface 5B of the concave groove 5, so that the side surface 5B of the concave groove 5 and the high pressure side seal 7 are circumferentially arranged. It is configured to shut off.

Reference numeral 10 denotes a low pressure side seal which constitutes an outer diameter side portion which is the outer side in the radial direction of the seal body 6. The low pressure side seal 10 has a rectangular cross section as shown in FIG. Lower surface 10A as a receiving surface pressed by
And an upper side surface 10B as a sliding contact surface facing the lower side surface 10A in the vertical direction and slidingly contacting the mating tooth bottom surface 13A, and the side surfaces 5B, 5 of the concave groove 5 inside and outside the low pressure side seal 10 in the radial direction.
It is composed of an inner side surface 10C that contacts C and an outer side surface 10D. The low-pressure side seal 10 extends from the position of the intermediate portion of the concave groove 5 in the spiral direction to the position of the outermost peripheral (winding end) end of the concave groove 5, and its end portion 10E is the end portion 7E of the high-pressure side seal 7.
As shown in FIG.

Here, the low-pressure side seal 10 is formed such that its thickness dimension (a spiral axial dimension) is thinner than that of the high-pressure side seal 7, and its width dimension is substantially the same as the width dimension of the concave groove 5. Are formed equally. And the low pressure side seal 10
Is elastically pressed in the groove 5 toward the mating tooth bottom surface 13A by the elastic body 11 contacting the lower side surface 10A, and the upper side surface 10B is slidably contacted with the tooth bottom surface 13A, and the inner surface 7C and the outer surface 7D is in contact with the side surfaces 5B and 5C of the groove 5.

Reference numeral 11 denotes an elastic body that presses the low-pressure side seal 10 against the tooth bottom surface 13A of the other side. As shown in FIG. 2, the elastic body 11 is made of an elastic material such as rubber and corresponds to the low-pressure side seal 10. In a state where it is formed into a shape and is elastically deformed so as to be compressed in the depth direction of the concave groove 5 as shown in FIG.
Bottom surface 5A side of groove 5 and lower side surface 10A of low-pressure side seal 10
Is sandwiched between.

Reference numeral 12 denotes an orbiting scroll which is provided to face the fixed scroll 1 so as to be capable of orbiting in the casing body. As shown in FIG. 1, the orbiting scroll 12 has a disk-like surface with a tooth bottom surface 13A on the surface side. Formed end plate 13
And a wrap portion 14 that is erected from the tooth bottom surface 13A of the end plate 13 toward the end plate 2 of the fixed scroll 1 and is formed in a spiral shape like the wrap portion 3 of the fixed scroll 1, and the rear side of the end plate 13. And a boss portion 15 provided at the center. The boss portion 15 is a crank 17 of a drive shaft 17 described later.
It is rotatably attached to A.

Here, the wrap portion 1 of the orbiting scroll 12
4 is the same as the wrap portion 3 of the fixed scroll 1, for example, 3
As shown in FIG. 4, a concave groove 16 having a U-shaped cross section and a bottom surface 16A and side surfaces 16B and 16C as wall surfaces is formed on the tooth tip 14A side before and after winding. ing. The seal body 6 including the high-pressure side seal 7, the low-pressure side seal 10 and the elastic body 11 is also mounted in the groove 16 on the orbiting scroll 12 side in the same manner as the groove 5 on the fixed scroll 1 side.

Reference numeral 17 denotes a drive shaft rotatably provided on the casing main body. As shown in FIG. 1, the drive shaft 17 has a crank 17A whose distal end extends into the casing main body.
Therefore, the axis O2 -O2 of the crank 17A is eccentric with respect to the axis O1-O1 of the drive shaft 17 by a predetermined dimension δ. And, in the crank 17A of the drive shaft 17,
The boss portion 15 of the orbiting scroll 12 is rotatably attached via an orbiting bearing 18, and the orbiting scroll 12 is given an orbiting motion via a rotation preventing mechanism (not shown) or the like.

In the fixed scroll 1 and the orbiting scroll 12, the wrap portion 14 of the orbiting scroll 12 is the wrap portion 3 of the fixed scroll 1 while the axis O2-O2 is eccentric with respect to the axis O1-O1 by the dimension δ. Are arranged so as to overlap with each other. As a result, when the orbiting scroll 12 is orbited with respect to the fixed scroll 1, a plurality of compression chambers 19, 19, ... whose volumes change between the wrap portions 3 and 14 in accordance with the orbiting are defined. It has become so.

Reference numerals 20 and 21 denote a suction port and a discharge port formed in the fixed scroll 1. The suction port 20 is bored on the outer peripheral side of the end plate 2 so as to communicate with the compression chamber 19 on the outermost diameter side, The discharge port 21 is provided at the center of the end plate 2 so as to communicate with the compression chamber 19 on the innermost diameter side.

The scroll type air compressor according to this embodiment has the above-mentioned structure, and its operation will be described below.

First, when the drive shaft 17 is rotationally driven from outside the casing by a drive source (not shown) such as a motor, this rotation is transmitted from the crank 17A of the drive shaft 17 to the orbiting scroll 12 via the orbiting bearing 18. As a result, the orbiting scroll 12 makes an orbiting motion about the axis O1 -O1 of the drive shaft 17 with an orbiting radius of δ.

The compression chambers 19, 19, ... Defined between the lap portions 3, 14 by this turning motion are continuously reduced from the peripheral side toward the central side, and the suction port 20.
The compressed air is sequentially compressed while being discharged from the discharge port 21 toward an external air tank (not shown) or the like.

Here, when the compression operation is started, on the inner diameter side of the wrap portion 3 (14) where the pressure in each compression chamber 19 becomes high, a part of the high pressure compressed air is recessed from each compression chamber 19 into the concave groove 5.
Inside the (16), the side surface 5B (16B) of the groove 5 (16)
And the inner surface 7C of the high-pressure side seal 7 in the direction of the arrow A in FIG.
Float (float) in the direction of the arrow B toward the tooth bottom surface 13A (2A) of the partner, and the tooth bottom surface 13A (2A)
Since the high pressure side seal 7 is slidably contacted with the lap portion 3 (1
The compression chambers 19 adjacent to each other are sealed airtightly via 4).

The compressed air is supplied to the high pressure side seal 7
The front end sides of the bottom surface lip portions 8 and the side surface lip portions 9 of the bottom groove 5A (16A) and the side surfaces 5B (1
6B) in a state of being elastically deformed, whereby the bottom surface lip portion 8 and the side surface lip portion 9 are formed in the concave groove 5 (1
6) A gap formed between the wall surface of 6) and the high-pressure side seal 7 and extending in the longitudinal direction of the concave groove 5 is blocked, and compressed air is transmitted from the high pressure side to the low pressure side between the compression chambers 19 along the gap. Prevent leaks.

On the other hand, on the outer diameter side of the wrap portion 3 (14) in which the pressure in each compression chamber 19 is low, the elastic body 11 in the groove 5 (16) makes the low-pressure side seal 10 of the seal body 6 a mating tooth. Since the pressure is applied in the direction of arrow B in FIG. 5 toward the bottom surface 13A (2A), the low-pressure side seal 10 slides the upper side surface 10A onto the tooth bottom surface 13A of the other side, and the inner side surface 10C and the outer side surface 1
0D to the side surfaces 5B (16B), 5C (1 of the groove 5 (16)
6C) so that the low-pressure side seal 10 hermetically seals between the compression chambers 19.

Thus, according to this embodiment, the sealing body 6
The inner diameter side high pressure side seal 7 and the outer diameter side low pressure side seal 1
0 and the low pressure side seal 10 is pressed against the tooth bottom surface 13A (2A) of the other side by the elastic body 11, so that the lap portion 3 (1
On the inner diameter side of 4), the concave groove 5 (16) is formed from within each compression chamber 19.
The compressed air that has penetrated into the inside causes the high pressure side seal 7 having, for example, heat resistance and wear resistance to the tooth bottom surface 13 of the other side.
A (2A) can be surely slidably contacted and the high pressure side seal 7
The tip ends of the bottom surface lip portions 8 and the side surface lip portions 9 can be reliably brought into contact with the concave grooves 5 (16), and the high pressure side seals 7 can hermetically seal between the compression chambers 19 for a long period of time. You can

On the outer diameter side of the wrap portion 3 (14),
The elastic body 11 allows the low pressure side seal 10 to face the tooth bottom surface 1 of the other party.
3A (2A) can be surely slidably contacted with each other, so that even if the pressure inside each compression chamber 19 is low, each compression chamber 1 can be prevented by the low pressure side seal 10.
It is possible to hermetically seal the space between 9 in a stable state.

Therefore, since the seal body 6 can reliably seal the space between the compression chambers 19 from the inner diameter side to the outer diameter side of the wrap portions 3 and 14 in a stable state, the compressed air between the compression chambers 19 can be prevented. It can effectively prevent parts from leaking,
It is possible to reliably improve the compression performance of the scroll air compressor.

Further, the high pressure side seal 7 and the low pressure side seal 10
Since the and are formed from different members, the high pressure side seal 7 can be formed of a resin material having high heat resistance and wear resistance corresponding to each compression chamber 19 on the inner diameter side, and high heat resistance and wear resistance are required. The low-pressure side seal 10 that is not formed can be formed of a resin material that is less expensive than the high-pressure side seal 7.

As a result, the material for the high-pressure side seal 7 and the material for the low-pressure side seal 10 can be selected according to the required sealing performance and cost, so that the degree of freedom in designing the seal body 6 can be increased.

Further, in the low-pressure side seal 10, since the lip portions such as the bottom surface lip portions 8 and the side surface lip portions 9 are omitted and the elastic body 11 is provided, the high sealing performance of the seal body 6 is maintained. At the same time, it is possible to effectively reduce the processing man-hours and costs as a whole.

Next, FIG. 6 shows a second embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. And
However, the feature of this embodiment resides in that a hollow elastic body 31 is used instead of the elastic body 11 in the first embodiment.

Here, like the elastic body 11 of the first embodiment, the elastic body 31 is formed of an elastic material such as rubber into a hollow cylindrical shape or an elliptic cylinder shape, and the depth of the concave groove 5 (16). The groove 5 is elastically deformed so as to be compressed in the depth direction.
It is sandwiched between the bottom surface 5A (16A) side of (16) and the lower side surface 10A of the low pressure side seal 10, and thereby the low pressure side seal 10 is pressed against the tooth bottom surface 13A (2A) of the other side.

However, in this embodiment, the elastic body 31 is formed in a hollow cylindrical shape and has the concave groove 5 (1
The thickness dimension 6) in the depth direction is formed to be larger than that of the elastic body 11, so that it is disposed in the concave groove 5 (16) in a state of being elastically deformed more than the elastic body 11.

Thus, in this embodiment having such a structure, it is possible to obtain substantially the same effect as that of the first embodiment. However, particularly in this embodiment, the elastic body 31 is greatly compressed so as to be compressed. Since it can be mounted in the groove 5 (16) in an elastically deformed state, even if the low-pressure side seal 10 is worn, the low-pressure side seal 10 can be utilized by utilizing the restoring force of the elastic body 31. It is possible to continue pressing in the direction of arrow B toward (2A), and it is possible to secure stable sealing performance by the low-pressure side seal 10 for a long period of time.

Next, FIG. 7 shows a third embodiment of the present invention. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals, and the description thereof will be omitted. I shall.
However, the feature of this embodiment is that the high pressure side seal 7 and the low pressure side seal 10 in the first embodiment are integrally formed.

In the figure, reference numeral 41 denotes a seal body used in the scroll type air compressor according to this embodiment.
Similar to the first embodiment, reference numeral 1 designates an inner diameter side portion of the seal body 41, and bottom surface lip portions 42, 42, ... And side surface lip portions 43, 4 elastically contacting the concave groove 5 (16).
, 3 are formed on the bottom surface 44A and the inner side surface 44B, and on the outer side of the high pressure side seal 44 in the radial direction by the elastic body 11 in the groove 5 (16), the tooth bottom surface of the other side. It is composed of a low pressure side seal 45 which is pressed toward 13A (2A). However, in this embodiment, the end 44C of the high pressure side seal 44 and the low pressure side seal 45 are
End portion 45A is integrated.

Thus, in this embodiment having the above-described structure, it is possible to obtain substantially the same effect as that of the first embodiment. However, particularly in this embodiment, the high pressure side seal 44 and the low pressure side seal 45 are obtained. Since the and are integrally formed, it is possible to prevent compressed air from leaking between the compression chambers 19 from between the end portion 44C of the high pressure side seal 44 and the end portion 45A of the low pressure side seal 45, and the sealing performance of the seal body 41 is improved. Can be further improved, and both can be manufactured at a time by means such as compression formation, and the man-hours and the like of the entire seal body 41 can be reduced to reduce the groove 5 (1
6) It is possible to surely improve the workability of assembling inside.

In the first embodiment, the seal body 6 is composed of the two divided seals including the high pressure side seal 7 and the low pressure side seal 10. However, the present invention is not limited to this.
For example, the seal body may be divided into three or more pieces, a plurality of lip portions may be provided on the inner diameter side portion of the seal body, and the outer diameter side portion may be pressed against the tooth bottom surface of the other side by the elastic body.

In each of the above embodiments, the wrap portion 3 on the fixed scroll 1 side and the wrap 14 on the orbiting scroll 12 side are provided.
The concave grooves 5 and 16 are formed in and, respectively, and these concave grooves 5 and 16 are formed.
Although it has been described that the seal bodies 6 and 17 are mounted in the seal body 16, instead of this, only one of the lap portion 3 of the fixed scroll 1 and the wrap portion 14 of the orbiting scroll 12 has a seal body. May be provided.

Further, in each of the above-mentioned embodiments, the case where the scroll type fluid machine is used as the scroll type air compressor has been described as an example, but the present invention is not limited to this, and may be applied to, for example, a vacuum pump, a refrigerant compressor or the like. You may apply.

[0056]

As described in detail above, according to the present invention, a plurality of lip portions are formed on the inner diameter side portion of the seal body, and the outer diameter side portion of the seal body is formed in the concave groove by the elastic body to form the mating teeth. Since it is configured to press against the bottom surface, on the inner diameter side of the wrap part where each compression chamber has a high pressure, the inner diameter side portion of the seal body floats (floats) due to the high pressure compressed fluid entering the concave groove from each compression chamber. It is possible to make sure sliding contact with the tooth bottom surface of the other party, and to make sure that the tip side of each lip part comes into contact with the wall surface of the concave groove surely, and the inner diameter side part of the seal body seals between the high pressure side compression chambers. Can be sealed on. Further, on the outer diameter side of the wrap portion, since the outer diameter side portion of the seal body can be surely brought into sliding contact with the tooth bottom surface of the other side by the pressing of the elastic body, even if each compression chamber has a low pressure, the outer diameter side of the seal body The side portion enables airtight sealing between the compression chambers on the low pressure side in a stable state. Therefore, the sealing body can reliably seal between the compression chambers from the inner diameter side to the outer diameter side of the wrap portion in a stable state, so that the compression performance of the scroll fluid machine can be reliably improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a fixed scroll, an orbiting scroll, a seal body and the like of a scroll air compressor according to a first embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a state before the seal body in FIG. 1 is mounted in the recessed groove of the wrap portion.

FIG. 3 is a partial perspective view showing a high pressure side seal in FIG. 2 in an enlarged manner.

FIG. 4 is an enlarged vertical cross-sectional view showing a state in which the high-pressure side seal in FIG. 3 is mounted in the groove of the wrap portion.

FIG. 5 is an enlarged vertical cross-sectional view showing a state in which the low-pressure side seal in FIG. 1 is mounted together with the elastic body in the concave groove of the wrap portion.

FIG. 6 is a vertical cross-sectional view similar to FIG. 5, showing a state in which an elastic body of a seal body according to a second embodiment of the present invention is mounted in a concave groove of a wrap part together with a low-pressure side seal.

FIG. 7 is an exploded perspective view similar to FIG. 2, showing a state before the seal body used in the scroll type air compressor according to the third embodiment of the present invention is mounted in the groove of the wrap portion.

[Explanation of reference numerals] 1 fixed scroll 2,13 end plate 2A, 13A tooth bottom surface 3,14 wrap portion 5,16 concave groove 5A, 16A bottom surface (wall surface) 5B, 5C, 16B, 16C side surface (wall surface) 6,41 seal body 7,44 High pressure side seal (inner diameter side portion) 7A, 44A Lower side surface 7B Upper side surface 7C, 44B Inner side surface 7D Outer side surface 8,42 Bottom lip portion 9,43 Side lip portion 10,45 Low pressure side seal (outer diameter side portion) ) 10A lower side surface 10B upper side surface 10C inner side surface 10D outer side surface 11,31 elastic body 12 orbiting scroll 17 drive shaft 19 compression chamber 20 suction port 21 discharge port

Claims (1)

[Claims] 1. A fixed scroll in which a spiral wrap portion is erected on a tooth bottom surface of an end plate, and a plurality of fixed scrolls provided on the end surface of an end plate of the end plate and a wrap portion of the fixed scroll. And a revolving scroll in which a spiral wrap portion is erected so as to define a compression chamber of the revolving scroll, and at least one of the revolving scroll and the fixed scroll has a tooth of the wrap portion. In a scroll type fluid machine in which a groove extending along the tip is formed, and a seal body that is in sliding contact with the tooth bottom surface of the other side is mounted in the groove, an inner diameter side portion of the seal body on the inner diameter side is provided. Is provided in the longitudinal direction of the seal body so as to be spaced apart from each other, and is provided with a plurality of lip portions elastically contacting the wall surface of the recessed groove. The outer diameter side is the tooth bottom of the other side Scroll fluid machine, characterized in that an elastic body for pressing and a structure provided between the bottom surface of the groove to.