JPH02181082A - Scroll type fluid device - Google Patents

Abstract

PURPOSE:To improve seal performance by forming a seal groove at the forward end surface of each lap of a fixed and a rotary scroll, engaging a chip seal in each through a seal seat, and forming concave parts and convex parts alternately at the bottom of the seal seat continuously. CONSTITUTION:In a scroll type fluid device having fixed and rotary scrolls 7, 8 each having a lap 13, 14 provided spirally on the front surface of a mirror plate 11, 12 respectively installed with the laps 13, 14 engaged with each other, a seal groove 40 is formed at the forward end surface of the lap 13 of the fixed scroll 7 (similar to the rotary scroll 8). A chip seal 41 is engaged in this seal groove 40 through a seal seat 42. This seal seat 42 is formed having concave parts 42a... and convex parts 42b... of resilient material such as fleon- resistant rubber or the like alternately provided continuously along the length. Seal for the radial direction between the mirror plates 11, 12 and seal under the chip seal 41 are thus made possible simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a scroll-type fluid device used in a compressor of a refrigeration system, and particularly relates to a seal structure between both scrolls.

(Prior art) In general, scroll type fluid devices are
As disclosed in Japanese Patent No. 8002, a fixed scroll and a revolving scroll each having a spiral wrap erected on the front surface of an end plate are arranged side by side with their wraps meshing with each other,
A crankshaft is eccentrically connected to the back surface of the end plate of the revolving scroll, and the revolution of the crankshaft causes the revolving scroll to revolve around the fixed scroll without rotating on its own axis. A sealed chamber is formed between the end plates of both scrolls by both wraps.
The sealed chamber moves toward the center and contracts to compress the fluid. Therefore, as shown in FIG. 5, a seal groove (b) is created on the tip end surface of the wrap (a), and a tip seal (C) is fitted into the seal groove (b) so that the chip seal (C) faces the wrap (a). The airtight chamber is kept in a sealed state by sealing between the mirror plate and the facing end plate.

(Problems to be Solved by the Invention) In the scroll-type fluid device described above, although it is possible to make the width of the tip seal (C) approximately equal to the width of the seal groove (b), It was extremely difficult to make the height match the length from the bottom of the seal groove (b) to the end plate due to wear and other concerns. Therefore, as shown in Fig. 5, back pressure is applied to the lower surface of the tip seal (C) using high-pressure fluid, or a spring is provided between the lower surface and the bottom surface of the seal groove (Japanese Patent Laid-Open No. 57-148002). (see publication), the tip seal (C) is pressed against the end plate.

However, below the tip seal (C), there is a communication path (d) that is continuous from the beginning of wrapping to the end of wrapping (a).
), as shown by the arrow in Figure 5, the communication path (d
), which causes the problem of poor sealing performance, which is one of the causes of reduced compressor efficiency.

The present invention has been made in view of the above, and by partitioning the space below the tip seal into a plurality of sections in the longitudinal direction, leakage of fluid passing below the tip seal is prevented, and sealing performance is improved. The purpose is to improve compressor efficiency, etc.

(Means for Solving the Problems) In order to achieve the above object, the means taken by the present invention are as shown in FIGS. 1 and 2.
, a fixed scroll (7) and a revolving scroll (8) with wraps (]3) and (14) erected in front of (12).
) are arranged side by side with their wraps (13) and (1, 4) meshing with each other, and the revolving scroll (8) revolves around the fixed scroll (7) without rotating. equipment is assumed. A seal groove (40) is formed on the tip end surface of each of the wraps (13) and (14), and a tip seal (41) is fitted into the seal groove (40).
41) and the bottom surface of the seal groove (40) is an end plate (11) that faces the chip seal (41).

A seal seat (42) that presses against (12) is interposed. Further, the seal seat (42) is made of an elastic material, and has recesses (42a) and protrusions (42b) formed alternately and continuously in the longitudinal direction at the bottom, and the recesses (42b)
is seated on the bottom of the seal groove (40) and the seal seat (4
2) is provided.

(Function) With the above configuration, in the present invention, when the revolving scroll (8) revolves around the fixed scroll (7) without rotating, both scrolls (7).

By wrapping (13) and (14) of (8), the end plate (1
A sealed chamber (18) is formed between , 1) and (12),
The sealed chamber (18) is, for example, contracted to compress the fluid.

On the other hand, a tip seal (41) is provided at the tip of each of the wraps (13) and (14) via a seal seat (42), and the tip seal (41) is formed by the elastic force of the seal seat (42). The end plates (12), (11
) to provide a radial seal between the head plates (12) and (11). Furthermore, below the tip seal (41), a seal groove (40) is provided.
between the bottom surface of the seal seat (42) and the bottom surface of the seal seat (42).
b).

(42b), ... are in contact and each four parts (
It is partitioned into independent spaces 42a), (42a), . . . to prevent leakage of fluid in the longitudinal direction and keep each of the sealed chambers (18) in a sealed state.

(Effects of the Invention) Therefore, according to the scroll type fluid device of the present invention, the seal seat (42) is provided below the tip seal (41), and the tip seal (41) is connected to the end plate facing the end plate by the seal seat (42). (11), (12) and at the same time,
Since the space below the tip seal (42) is partitioned into a plurality of spaces in the longitudinal direction by the convex portions (42b), (42b)..., leakage of fluid passing below the tip seal (41) is ensured. At the same time, radial sills between the mirror plates (11) and (12) can be reliably formed. As a result, each wrap (13), (14) and end plate (11), (
12), the degree of sealing of each sealed chamber (18) can be improved, and compressor efficiency can be improved.

(Example) Hereinafter, an example of the present invention will be described in detail based on the drawings.

As shown in FIG. 1, (1) is a scroll-type fluid device, which is used in a compressor in a refrigeration system to compress refrigerant gas (fluid) to high pressure and discharge it.

The scroll type fluid device (1) has a closed casing (2
) A scroll mechanism (3) and a drive mechanism (4) are housed in the casing (2), and a suction pipe (5) is connected to the side of the casing (2), and a discharge pipe (6) is connected to the upper part of the casing (2). has been done. The scroll mechanism (3) consists of a fixed scroll (7) and a revolving scroll (8), and also includes a drive mechanism (4).
) is composed of an electric motor (9) and a crankshaft (10).

The fixed scroll (7) and the revolving scroll (8) each have a wrap (13) in front of the end plate (11), (12).
), (14) are arranged in a spiral shape, and both scrolls (7) and (8) are mirror plates (11).

(12) are arranged vertically in parallel with their front surfaces facing each other, and both wraps (13) and (14) are engaged with each other. The fixed scroll (7) has a flange (11a) connected to the outer peripheral edge of the end plate (11), and is fixed to the casing (2) by the flange (11a). ) It is divided into an upper high pressure chamber (2a) and a lower low pressure chamber (2b). Furthermore, a scroll shaft (12a) is provided protruding from the center of the back surface of the M plate (12) of the revolving scroll (8). On the other hand, the crankshaft (10) has a boss (10c) having a concave scroll bearing hole (10b) at the upper end of the crankshaft (10a).
a support frame (15) connected and fixed to the flange (11a) of the fixed scroll (7);
It is inserted into and supported. Further, an electric motor (9) is connected to the crank main shaft (10a), and the scroll bearing hole (10b) is provided eccentrically from the bearing center (01) or the axis (02) of the crank main shaft (10a). , the scroll shaft (12a) of the revolving scroll (8) is inserted into the scroll bearing hole (10b) through the stub bearing (1).
6). Then, due to the eccentricity of the scroll bearing hole (1, Ob), the orbiting scroll (8) revolves around the fixed scroll (7), and the center (0+) of this scroll bearing hole (10b) (scroll shaft (12)
a), the movable fulcrum of the revolving scroll (8), and the axis (02) of the crank main shaft (10a) serve as the center of revolution.

The fixed scroll (7) and the revolving scroll (8) have both wraps (13) and (14) in multi-point contact (1
7) each wrap (13),
(14) whose end face is the other scroll end plate (12)
, (11), and between the contact (17) and the closed chamber (18
) is formed.

In addition, the flange (11a) of the fixed scroll (7)
and the wrap (13) is an inlet (19) with an open bottom.
), while a discharge port (20) is bored in the approximate center of the end plate (11), and low-pressure refrigerant gas is supplied from the suction port (19) to the sealed chamber (18), High pressure refrigerant gas is discharged from the sealed chamber (18) into the high pressure chamber (2a) via the discharge port (20).

The support frame (15) also has a revolving scroll (
The end plate (12) of 8) is composed of a substantially donut-shaped disk portion (15a) extending toward the back side, and a substantially cylindrical portion (15b) extending downward from the lower inner end of the disk portion (15a). There is. The disk portion (15a) is fixed to the flange (11a) of the fixed scroll (7) at its upper outer periphery, and a communication hole (15c) through which the refrigerant gas passes extends vertically across the suction port (19). and a stepped portion (15d) where the end plate (12) of the revolving scroll (8) is located.
) is formed at the top. An electric motor (9) is attached to the lower part of the cylindrical part (15b), and a large diameter hole (15e) into which the boss (10c) of the crankshaft (10) is fitted.
), and a small diameter hole (
15f') is drilled, and the upper crank bearing (21) is installed in the large diameter hole (15e), and the lower crank bearing (22) is installed in the lower part of the small diameter hole (1511), and the crankshaft (10) is fitted. is supported.

Further, a thrust bearing (31) is interposed between the end plate (12) of the revolving scroll (8) and the stepped portion (15d) of the support frame (15), and the revolving scroll (8)
) thrust force is stopped by the receiver. Although not shown, the revolving scroll (8) is provided with a rotation prevention mechanism and is configured to only revolve around the fixed scroll (7).

On the other hand, the disk portion (15) in the support frame (15)
The inner peripheral side of a) is configured as a balancer chamber (32),
A main balancer (33) located within the balancer chamber (32)
is provided protrudingly from the upper end of the boss (10c) of the crankshaft (10), and a sub-balancer (34) is provided below the rotor (9a) of the electric motor (9).
33) and (34) to maintain the inertial balance of the revolving scroll (8).

Next, the double scroll (7) which is a feature of the present invention.

(8) The seal structure between them will be explained. Note that this seal structure has both scrolls (7).

Since both (8) and (8) are the same, fixed scroll (7) will be explained.

As shown in FIGS. 2 to 4, the fixed scroll (7) has a seal groove (40) cut in the tip surface of the wrap (13), and a chip seal (40) in the seal Fz (40).
41) is fitted through a seal seat (42). The seal groove (40) is formed with a U-shaped cross section so that the front opening faces the end plate (12) of the revolving scroll (8), and the seal groove (40) spirally extends from the suction port (19) to the discharge port according to the wrap (13). (20).

The tip seal (41) is formed in a spiral shape corresponding to the seal groove (40), is formed as a single piece with a rectangular cross section, and has a width approximately equal to the width of the seal groove (40). Correspondingly, the end plate (12) of the revolving scroll (8) whose upper surface faces each other
).

On the other hand, the seal seat (42) is a chip seal (41).
Correspondingly, it is formed in a spiral shape and is made of an elastic material such as fluorocarbon-resistant rubber. Furthermore, the seal seat (42) is formed to have the same width and length as the width and length of the tip seal (41),
Multiple four parts (42a), (42a), -・ on the bottom
- and a convex portion (42b).

(42b), . . . are formed. The recess (42a
) and the convex portions (42b) are formed on both sides of the seal seat (42), and are formed alternately and continuously in the longitudinal direction. Then, the convex portion (42b
) is seated in the seal groove (40) in contact with the bottom surface,
Each recess (42a), (42a).

... each constitute one partitioned space. Furthermore, the height from the lower end surface of the convex portion (42b) to the upper surface of the chip seal (41) is formed to be slightly larger than the length from the bottom surface of the seal groove (40) to the opposing end plate (12), so that the height of the seal seat The chip seal (4) is configured to be pressed against the end plate (12) by the elastic force of (42).

Similarly, a chip seal (41) and a seal seat (42) are also provided at the wrap (14) of the revolving scroll (8).
) is provided.

In addition, (51) in Fig. 1 is a lubricating oil reservoir,
Although not shown, lubricating oil is supplied to each oil pan (16) from an oil supply path formed on the crankshaft (10).

(21) and (22). Also, (5
2) is a gas passage formed in the cylindrical part (15b) of the support frame (15) through which the refrigerant gas passes;
2).

Next, the operation of this scroll fluid device (1) will be explained.

First, refrigerant gas flows into the case (2) from the suction pipe (5), passes outside the electric motor (9) in the low pressure chamber (2b), and passes through the communication hole (15c) of the support frame (15). The closed chamber (
]8).

On the other hand, the revolving scroll (8) revolves around the fixed scroll (7) due to the rotation of the crankshaft (10), and
It revolves without rotating due to a rotation prevention mechanism (not shown). The revolution of this revolving scroll (8) causes the closed room (
18) is sequentially formed between both wraps (13L (14)) and contracts, compressing the refrigerant gas and discharging it from the discharge port (20).

During this compression operation, both the scrolls (7),
In (8), between each wrap (13), (14) and the end plate (11), (12), there is a tip sill (41).
), and each sealed chamber (]8) is kept in a sealed state. In other words, the gap between the inner circumferential side of the chip seal (41) and the inner circumferential side of the seal groove (40) is minute, and refrigerant gas rarely leaks from this gap.
Moreover, the tip seal (41) is pressed against the opposing end plates (11) and (12) by the elastic force of the seal seat (42), and sealing is performed in the radial direction. Furthermore, the seal seat (42) has respective convex portions (42b) (42b),
... are seated in contact with the bottom of the seal groove (40), so each of the four parts (42a) is located below the chip seal (41).
, (42a), . . . are continuous in the longitudinal direction, which prevents the refrigerant gas from leaking in the longitudinal direction passing below the tip seal (41), as shown by the arrow in Fig. 3. I will do it. In particular, both scrolls (7),
(8)'s wraps (13), (14) contact (1, 7) on the sides and adjoin the lateral sound chamber (18);
(18), the lower part of the chip seal (4) corresponding to this contact (17) is partitioned off by each convex part (42b). Leakage of refrigerant gas is prevented, and the sealed chamber (18) is maintained in a sealed state.

Therefore, the sill seat (4) is located below the chip seal (41).
2), and the seal seat (42) presses the tip seal (41) against the opposing end plates (11) and (12), and at the same time, the convex portions (42b) (42b), ・ are provided below the tip seal (42). Because the space is divided into multiple spaces in the longitudinal direction, the mirror plates (11) and (12)
radial seal and tip seal between
) The lower seal can be reliably performed at the same time. As a result, the sealing performance between each wrap (13), (1, 4) and the end plate (1), (12) can be improved, so the degree of airtightness of each sealed chamber (18) is improved. ,
Compressor efficiency can be improved.

In this embodiment, the scroll type fluid device (1) is applied to a compressor of a refrigeration system, but it may also be applied to a compressor, a blower, an expander, etc. of various other devices.

Moreover, the shapes of the four parts (42a) and the convex part (42b) of the seal seat (42) are not limited to those in the embodiment.

[Brief explanation of the drawing]

1 to 4 show an embodiment of the present invention, FIG. 1 is a vertical sectional view of a scroll type fluid device, FIG. 2 is an exploded perspective view showing the seal structure, and FIG. 3 is a side view of the same cross section. , FIG. 4 is a plan view of the fixed scroll. FIG. 5 is a perspective view showing a conventional seal structure. (1)...Scroll type fluid device, (2)...Casing, (7)...Fixed scroll, (8)...Revolving scroll, (10)...Crankshaft, (11)
. (12)... End plate, (13), (14)... Wrap, (18)... Sealed chamber, (40)... Seal groove, (41)... Chip seal, (42)... ... Seal seat, (42a) ... Concave portion, (42b) ... Convex portion. ] 7

Claims (1)

[Claims] (1) Wrap (1
Fixed scroll (7) consisting of 3) and (14) erected
and the revolving scroll (8) each lap (13),
(14) are arranged in parallel in mesh with each other, and the revolving scroll (8)
In a scroll-type fluid device in which a fixed scroll (7) revolves around the fixed scroll (7) without rotating, a seal groove (40
) is formed in the seal groove (40), and a chip seal (
At the same time, a chip seal (41) is inserted between the chip seal (41) and the bottom surface of the seal groove (40).
) is interposed between the seal seats (42) that press the opposing end plates (11) and (12), and the seal seats (42) are made of an elastic material and have a recess (42a) at the bottom. Convex portions (42b) are formed alternately and continuously in the longitudinal direction, and the seal seat (42
) is provided.