JP3516160B2 - Seal structure in scroll fluid machine and scroll fluid machine - Google Patents

Description

Detailed Description of the Invention

[0001]

The present invention relates comprises a fixed scroll having erected a spiral fixed wrap on the surface of the solid Teikagami plate forming a compression chamber in the housing, spiral swirl in the surface of the swivel mirror plate The orbiting scroll with the wraps upright is fitted to each other by being shifted by 180 ° so as to orbit the orbiting scroll with respect to the fixed scroll by the drive shaft, and the auxiliary crankshaft mechanism provided on the outer peripheral portion of the orbiting scroll. For example, the present invention relates to a scroll fluid machine such as a scroll type vacuum pump or a compressor which is prevented from rotating due to the above, and more specifically to a structure of a seal member in this kind of machine.

[0002]

2. Description of the Related Art A scroll fluid machine as described in the preceding paragraph is well known to those skilled in the art, but just in case,
What is described in JP-A-55-64180 will be described as an example.

In this specification, the inner circumference and the outer circumference mean
The radial direction of the fixed and orbiting scrolls is referred to, and the inner side and the outer side are also referred to in the axial direction.

[0004] In FIG. 7, (1) is provided with a suction hole (9) and the discharge hole (10) is provided with solid Teikagami plate (1a), inward from this fixed end plate (1a) (rightward in the drawing) involute curved upstanding towards, or formed solid curved to approximate this curve
In the fixed scroll consisting a constant wrap (1b), the housing
It is fixed to (6).

[0005] (2), swivel mirror plate and (2a), the orbiting end plate (2
a) from the outer direction (involute curved to straight upright toward leftward) in the figure, or in the orbiting scroll consisting this curve approximating curved to form the orbiting wrap (2b), the housing (6) It is eccentrically mounted on a drive shaft (3) which is rotatably supported via bearings (5).

(4) is the orbiting end plate (2) of the orbiting scroll (2).
Oldham ring provided between a) and the housing (6), (7) is a housing chamber formed between the swivel end plate (2a) and the housing (6), and (8) is a fixed scroll. (1)
Orbital wrap (2b) of fixed wrap (1b) and orbiting scroll (2)
(11) is a gas inflow part, (1)
2) is an annular seal groove provided in the seal portion (1c) of the fixed scroll (1).

A seal member (13) is provided in the annular seal groove (12).
Are fitted together with the elastic body (14) provided on the outside thereof.

A tip seal groove (not shown) having a concave cross section is formed on the tip surfaces of the wraps (1b) and (2b) of the scrolls (1) and (2), and the tip seal grooves have wear resistance. ,
Tip seal (not shown) of self-lubricating is fitted.

When the orbiting scroll (2) is eccentrically rotated via the drive shaft (3), the gas sucked through the suction hole (9) is
Both scrolls (1) (2) confined to wrap (1b) sealed space formed by (2b) (8) of the progressively compressed, becomes high temperature and high pressure, and discharges from the discharge hole (10).

The seal member (13) prevents gas from leaking from the housing chamber (7) to the gas working chamber (11).

[0011] Incidentally, the orbiting motion of the orbiting scroll (2), chip <br/> Lumpur-edge face of the orbiting scroll (not shown) (2) is in sliding contact with a fixed end plate (1a), this tip seal surface roughness of the fixed end plate to sliding contact (1a) is are smaller than the surface roughness of the stationary end plate at the inner circumference than the sliding surface of the tip seal (1a). Sealing of the tip seal, considering wear resistance, fixed end plate at the location where the chip seal is in sliding contact with (1
The surface roughness of a) is preferably 0.01 to 0.5 μmRa.

[0012]

In the conventional device as described above, the seal member (13) is an elastic body provided on the outside thereof.
By (14), since the repression pivoting mirror plate (2a), although prima facie sealability obtained, to completely cut off the gas to be flowed into the inner circumferential direction from the outer periphery of the seal member (13) It is difficult.

That is, regardless of whether the scroll fluid machine is a compressor or a vacuum pump, a pressure difference exists between the inner circumference and the outer circumference of the seal member (13).
Depending on the sealing property of 3) and the pressing force against the swivel end plate (2a), the pressure or vacuum degree of the obtained compressed gas is greatly affected.

Therefore, the gas having a pressure difference between the inner and outer circumferences is
Between the seal member (13) and the inner and outer peripheral surfaces of the annular seal groove (12),
Between the seal member (13) and the elastic body (14), and the seal member
(13) when you try to leakage from between the swivel mirror plate (2a).

However, since the seal member (13) is in the form of a closed ring, the diameter of the seal member (13) should be expanded or reduced while maintaining a perfect circular shape due to the pressure applied to its inner or outer peripheral surface. However, it is inevitable that a difference in the radial deformation amount partially occurs when viewed in the circumferential direction. Therefore, the pressure contact force with respect to the mating member is different at each portion in the circumferential direction, and even if the pressure received is constant, the sealability partially differs, and this sealability is small. Oite the blocking force of the gas is reduced to.

Further, in order to improve the blocking property, the elastic body (1
4) as a powerful and a pressing force against the swivel mirror plate (2a) of the sealing member (13) and large, with the wear becomes large in the sealing member (13), the rotational resistance of the orbiting scroll (2) Since the elastic body (14) is also large, there is a limit to the strength of the elastic body (14).

In view of the above problems of the prior art, the present invention has a simple structure so that good sealing performance can be obtained and at the same time, the sealing performance at each portion in the circumferential direction is always uniform. Another object of the present invention is to provide a scroll fluid machine including the seal member.

[0018]

According to the present invention, the above problems can be solved as follows. (1) Do not stand the spiral fixed wrap on the fixed end plate.
Fixed wrap for fixed scroll and swivel end plate
For swivel scrolls that have a spiral swirl wrap
Kicking orbiting wrap mutually fitted to match Rutotomoni, the orbiting scroll, the scroll fluid machine which is adapted to pivot relative to the fixed scroll without rotating, the solid
An annular seal groove is formed on the facing surfaces of the fixed mirror plate and the swivel mirror plate, and in the annular seal groove, a sliding member that can abut against the end surface of the mating side is integrally formed on the outside of the sliding member. Elastic material
The inner peripheral edge of the support piece
, A flexible pressure receiving piece that projects toward the outside
A sealing member consisting of a pressure
Due to the pressure of the internal fluid accompanying the operation of the fluid machine,
The sliding member presses the end plate of the other scroll to
And the lip-shaped pressure receiving piece of the pressure receiving member is
By the atmospheric pressure acting on the side, the inner circumference of the annular seal groove
By pressing the face you in to seal.

( 2 ) In the above item (1), the pressure receiving member has a U-shaped cross section that opens toward the side of the sliding member on which the fluid pressure acts.

( 3 ) In the above item (1) or (2), the pressure receiving member has a recessed portion facing the side on which the fluid pressure acts on the sliding member.

( 4 ) In the above item ( 3 ), the pressure receiving member has recessed portions on both sides in the width direction of the sliding member.

( 5 ) In the above item ( 4 ), the recessed portions on each side are provided at staggered positions.

( 6 ) In the above item (1) or (2), the pressure receiving member is a tubular member having an inclined surface on the side where the fluid pressure acts.

( 7 ) In any one of the above items (1) to ( 6 ), the contact surface of the pressure receiving member with respect to the annular seal groove is provided with a ridge protruding toward the side surface of the annular seal groove.

( 8 ) In any one of the above items (1) to ( 7 ), the sliding member and the pressure receiving member are made of different materials.

( 9 ) In any one of the above items (1) to ( 7 ), the sliding member and the pressure receiving member are integrally formed of the same material.

( 10 ) In any one of the above items (1) to ( 9 ), the surface roughness of the end plate with which the seal member is in sliding contact is greater than the surface roughness of the end plate on the inner surface of the sliding contact surface of the seal member. Small

( 11 ) A scroll fluid machine having a seal structure according to any one of the above items (1) to ( 10 ).

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION The feature of the present invention resides in the structure of the seal member fitted in the annular seal groove in various scroll fluid machines having the basic structure as described above with reference to FIG. Therefore, description will be given below with reference to FIGS. 1 to 6 in which only a portion directly related to the present invention is enlarged.

1 and 2 show an example in which the first embodiment of the seal member according to the present invention is applied to a scroll vacuum pump.

The annular seal groove (21) in FIG. 1 is provided on the inner side surface of the fixed scroll (22), and its opening is the orbiting end plate of the orbiting scroll (23), like the one shown in FIG.
It faces (23a).

The annular seal groove (21) has a rectangular cross section, and the annular seal member (24) is fitted therein. The seal member (24) is a self-lubricating material having low friction and heat resistance and wear resistance, for example, a slightly hard synthetic resin such as "Teflon" (trademark), or a slightly flat rectangular sliding member (2) made of metal.
On the outer surface of (5), a lip-shaped pressure receiving piece (26b) facing outward is projected from the inner peripheral end of the supporting piece (26a) facing in the radial direction, which is made of an elastic material such as fluorine rubber. the composed Te flexible pressure receiving member (26), by chemical coupling means, or heat treatment such as adhesives, are integrally formed.

The inner surface of the sliding member (25) is roughly mirror-finished so that the friction is as low as possible.

The radial width of the sliding member (25) (W2) is slightly smaller comb than the radial width of the annular seal groove (21) (W1)
is there. The axial depth of the annular seal groove (21) is slightly larger than w1. The support piece (2) of the flexible pressure receiving member (26)
The width of 6a) in the radial direction is substantially equal to the width w2 of the sliding member (25), and both are aligned and overlapped.

The inner peripheral surface of the pressure receiving piece (26b) of the pressure receiving member (26) is
A slight amount (w3 in the figure) is projected or raised in the inner peripheral direction from a portion slightly outside the inner end of the support piece (26a).

Therefore, the sliding member (25) and the pressure receiving member (2
Between the outer peripheral surface of the support piece (26a) of 6) and the outer peripheral surface of the annular seal groove (21), there is a gap w4 which is substantially equal to or slightly smaller than w3.

A very small axial gap w5 is provided on the facing surface of the fixed scroll (22) and the orbiting end plate (23a) of the orbiting scroll (23).

When the atmospheric pressure on the inner peripheral side of the annular seal groove (21) decreases with the operation of the scroll vacuum pump, the atmospheric pressure becomes
Orbiting end plate of the fixed scroll (22) and the orbiting scroll (23) (2
It acts in the annular seal groove (21) from the outer peripheral side through the gap w5 on the surface facing 3a).

Therefore, the sliding member (25) and the pressure receiving member (2
6) is a slight displacement in the inner circumferential direction, and the sliding member (25) is the orbiting end plate of the orbiting scroll (23) due to the support piece (26a) of the pressure receiving member (26) on which atmospheric pressure is acting. Pressed in the direction of (23a), the pressure receiving piece (26b) of the pressure receiving member (26) presses the inner peripheral surface of the annular seal groove (21).

However, at this time, the pressure receiving piece (2) of the pressure receiving member (26) is
Since 6b) can be slightly deformed in the inner circumferential direction, the pressure receiving member (26b) of the annular pressure receiving member (26) has an annular seal groove with a substantially uniform pressing force over the entire circumference. Since the inner peripheral surface of (21) is pressed, the sealing property does not become uneven due to the pressing force at each portion in the circumferential direction unlike the conventional one described above.

Moreover, in this embodiment, the entire inner peripheral surface of the pressure receiving piece (26b) of the pressure receiving member (26) does not contact the inner peripheral surface of the annular seal groove (21) due to the atmospheric pressure. Since only the portion of the pressure receiving piece (26a) that protrudes toward the inner peripheral side beyond the inner peripheral surface of the sliding member (25) is in contact with the inner peripheral surface of the annular seal (21), The pressing force per unit area is larger than that of the conventional one in which the entire peripheral surface is in contact with the inner peripheral surface of the annular seal groove, and a higher sealing property is obtained.

In the embodiment shown in FIGS. 1 and 2, the sliding member (25) and the pressure receiving member (26) of the seal member (24) are made of different materials. (25) (26) may be implemented as an integrated body made of the same material.

As can be understood from the above description, according to the present invention, the seal member is provided with the pressure receiving portion in the radial direction and the axial direction. A force component in the directional direction is generated to obtain good sealing properties. Therefore, it is desirable that the axial pressure receiving portion has flexibility.

[0044] In the sealing member (24) described in Figures 1 and 2, due to the suction air pressure of atmospheric pressure or vacuum state, as shown in FIG. 1, the inner peripheral side of the pressure receiving piece ( 26
b) is pressed. However, there is a case where a positive pressure (pressurized) gas such as air or a propane gas other than air, a natural gas, or a harmful gas, which is higher than the atmospheric pressure, is sucked and compressed. In this case, since the positive pressure (pressure) gas flows from the inner peripheral side of the seal member (24) to the outer peripheral side, the sealing pressure receiving piece member (24) (26
The b), the opposite side of the inner peripheral side fluid pressure at the annular seal groove (21) in is the side that to act (forming the upper side) in FIG. 1 and FIG. 2, to improve the sealing property.

The cross-sectional shape of the seal member described above is
Provided that it has pressure receiving parts in the radial and axial directions,
Various changes are possible. Some of them will be illustrated below.

The pressure receiving member has a U-shaped cross section that opens toward the side on which the fluid pressure acts, as shown at (27) in FIG. In this case, the U-shaped bottom piece (27b) is the pressure receiving piece.

As shown by (28) in FIG. 4, the pressure receiving member is provided with an appropriate number of recesses (28a) on the side on which the fluid pressure acts and on the opposite side, that is, on the inner and outer circumferences or on either side. It should be a block. In this case, one side piece (28b) of the recessed portion (28a) serves as a pressure receiving piece.

As shown by (29) in FIG. 5, the pressure receiving member is provided with staggered recesses (29a) on the side on which fluid pressure acts and the side opposite thereto, that is, different positions on the inner and outer circumferences. To do. In this case, the one side piece (29b) of the recessed portion (29a) serves as a pressure receiving piece.

As shown in (30) of FIG. 6, the pressure receiving member is a hollow cylindrical member having an inclined surface (30a) on the side where the fluid pressure acts. In this case, the hollow cylindrical shape is used to facilitate the deformation. It should be noted that the pressure receiving piece (30b) that projects slightly
Is provided on the inner peripheral side of the pressure receiving member (30).

In any case, it is preferable that the contact surface of the pressure receiving member with respect to the annular seal groove is provided with a pressure contact portion that partially bulges toward the side surface of the annular seal groove.

In the present invention, it goes without saying that the annular seal groove and the seal member may be provided on the orbiting scroll side.

[0052]

According to the invention of claim 1, due to the pressure of the inflowing fluid, an axial seal with respect to the opposed end faces of the fixed scroll and the orbiting scroll and a radial seal with respect to the pressure of the incoming fluid are formed. It is done firmly. Since the pressure receiving member easily bends in the radial direction when receiving a pressure, the radial sealing becomes better.

With the pressure-receiving member having a simple shape, the pressure of the inflowing fluid can be decomposed in the axial direction and the radial direction to perform the sealing in both directions.

Invention of Claim 2 : Since the pressure receiving member expands to both sides in the axial direction by the pressure of the inflowing fluid, the pressure receiving member is pressed against the end face of the counterpart scroll and the bottom face of the annular seal groove, and the axial line is pressed. Good sealability in the direction is obtained, and the pressure receiving member effectively transmits the pressure of the inflowing fluid in the radial direction, so that good sealability is also obtained in the radial direction. In addition, the thickness of the pressure receiving member can be reduced to facilitate its deformation, and the amount of material used and the weight thereof can be reduced.

Invention of Claim 3 : Even if the recess has a small groove shape and the pressure receiving member has sufficient rigidity, the fluid pressure can be effectively received and the sealing performance is improved. To help.

Invention of Claim 4 : The pressurized fluid can be used regardless of whether it enters in the radial direction or in the radial direction.

Invention of Claim 5 : It also has the effects of the invention of Claims 2-4 .

The invention according to claim 6 can be used regardless of whether the pressurized fluid enters in the radial direction or not, and the weight can be reduced and the amount of materials used can be reduced.

The invention according to claim 7 : The pressing force per unit area of the pressure receiving member against the annular seal groove is increased with respect to the pressure of the inflowing fluid, and a better sealing property is obtained.

The invention according to claim 8 : The sliding member is made of, for example, a material having low friction and wear resistance, and the pressure receiving member is made of a material having excellent flexibility.
The sliding property of the sliding member along the scroll end face is improved, and accordingly, the pressure receiving member is surely pressed against the inner side surface of the annular seal groove, and the pressure receiving member is deformed by receiving the pressure of the fluid. Suitable pressure contact with the seal groove.

Invention of Claim 9 : The sliding member and the pressure receiving member can be manufactured easily and at low cost.

Invention of Claim 10 : The sliding property and wear resistance of the sliding member of the sealing member are improved, and the sealing property is maintained for a long period of time.

Invention of Claim 11 : A scroll fluid machine having a simple structure and excellent sealing property can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a main part showing a first embodiment of a seal structure of the present invention.

FIG. 2 is likewise a vertical perspective view of the seal member according to the first embodiment.

FIG. 3 is a vertical perspective view showing a seal member having a different form.

FIG. 4 is a vertical cross-sectional perspective view showing seal members of different forms.

FIG. 5 is a vertical cross-sectional perspective view showing seal members of different forms.

FIG. 6 is a vertical perspective view showing a seal member having a different form.

FIG. 7 is a vertical sectional view schematically showing a conventional general scroll fluid machine.

[Explanation of symbols]

(1) Fixed scroll (1a) Fixed end plate (1b) Fixed wrap (1c) Seal part (2) Orbiting scroll (2a) Orbiting end plate (2b) Orbiting wrap (3) Drive shaft (4) Oldham ring (5) Bearing ( 6) Housing (7) Housing chamber (8) Sealed space (9) Suction hole (10) Discharge hole (12) Annular seal groove (13) Seal member (14) Elastic body (21) Annular seal groove (22) Fixed scroll (23) Orbiting scroll (23a) Orbiting end plate (24) Seal member (25) Sliding member (26) Pressure receiving member (26a) Support piece (26b) Pressure receiving piece (27) (28) (29) (30) Pressure receiving member (27b) (28b) (29b) (30b) Pressure receiving piece

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-9-268983 (JP, A) JP-A-9-177685 (JP, A) JP-A-2000-73972 (JP, A) JP-A-2000-73969 ( JP, A) JP 2000-87880 (JP, A) JP 10-238482 (JP, A) JP 8-100776 (JP, A) Actually open 5-58885 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) F04C 18/02 311 F04C 25/02 F04C 27/00 321

Claims (11)

(57) [Claims] 1. A spiral stationary wrap provided on the fixed end plate
A fixed wrap in a vertically mounted fixed scroll and a swirl disc in which a spiral swirl wrap is erected from a swivel end plate.
Rutotomoni that match fitted the orbiting wrap in a roll to each other,
The orbiting scroll in the scroll fluid machine which is adapted to pivot relative to the fixed scroll without rotating, the annular seal groove formed on the opposing surface of the orbiting end plate and the fixed end plate, in the annular seal groove, the other side A sliding member that can come into contact with the end face, and is integrally formed on the outside of the sliding member,
Inner circumference of support piece made of elastic material and facing in the radial direction
A lip-shaped pressure-receiving piece that projects outward from the end
A seal member consisting of a flexible pressure receiving member is fitted and
Due to the pressure of the internal fluid accompanying the operation of the Kroll fluid machine,
The sliding member presses the end plate of the scroll on the other side.
The lip-shaped pressure-receiving piece of the pressure-receiving member that seals is
Due to the atmospheric pressure acting on the outer peripheral side, the annular seal groove
It is characterized in that the inner peripheral surface is pressed and sealed.
Seal structure in a scroll fluid machine that. 2. The seal structure for a scroll fluid machine according to claim 1, wherein the pressure receiving member has a U-shaped cross section that opens toward a side of the sliding member on which the fluid pressure acts. 3. The pressure receiving member has a recessed portion that faces the side of the sliding member on which the fluid pressure acts.
Or the seal structure in the scroll fluid machine according to the item 2. 4. The seal structure for a scroll fluid machine according to claim 3 , wherein the pressure receiving member has concave portions on both sides in the width direction of the sliding member. 5. The seal structure for a scroll fluid machine according to claim 4 , wherein the recessed portions on each side are at staggered positions. 6. The seal structure for a scroll fluid machine according to claim 1, wherein the pressure receiving member is a tubular member having an inclined surface on the side on which the fluid pressure acts. The abutment surface for the annular seal groove of 7. pressure receiving member, the seal structure in a scroll fluid machine according to any one of claims 1 to 6 comprising providing a raised portion that protrudes toward the side surface of the annular seal groove . 8. The seal structure of a scroll fluid machine according to any one of claims 1 to 7, the sliding member and the pressure receiving member, was made of different materials. 9. The sliding member and the pressure receiving member, the seal structure in a scroll fluid machine according to any one of claims 1 to 7 as a single piece made of the same material. 10. The surface roughness of the end plates sealing member slidably contacts, scroll according to any one of claims 1 to 9 comprising as smaller than the surface roughness of the end plate of the inner side surface of the sliding contact surface of the sealing member Seal structure for fluid machinery. 11. A scroll fluid machine having the seal structure according to any one of claims 1 to 10 .