JPH01121582A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent leak of cooling medium to a compression chamber by chamfering corners of tip seals disposed in concave grooves provided at the end surface of a spiral body. CONSTITUTION:Concave grooves 26 are provided along the end surfaces of spiral matters 7, 10 of fixed and movable scrolls 5, 9. Tip seals 27 of similar forms to that of the concave grooves 26 are disposed in the grooves 26. Each tip seal 27 is provided with a chamfered part 30 at a corner adjacent to a deep end 29 on the inner side 28 of the radius of the concave groove 26. The tip seal 27 is tightly attached to the outer side of the radius of the concave groove 26 by pressure of compressed cooling medium applied to the chamfered part 30, and leak of compressed cooling medium from the inner side compression chamber to the outer side compression chamber is thus prevented by sealing action by this tight attachment.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a scroll compressor in which a tip seal is provided on the end face of a spiral wound body of a scroll.

(B) Prior art In the conventional scroll compressor described in Japanese Patent Application Laid-open No. 57-148002, which precedes the present invention, a concave groove is provided extending along the end surface of the spiral body of the scroll. A chip seal is disposed on the back side of the chip seal, and a backup member is disposed on the back side of the chip seal.

However, this type of scroll compressor has the disadvantage that the circulating refrigerant on the back side of the tip seal leaks from the compression chamber radially inside the spiral body to the compression chamber radially outside due to a pressure difference, and the backup member is provided. The disadvantage is that the number of parts increases accordingly.

(c) Problems to be Solved by the Invention The present invention solves the above-mentioned drawbacks, prevents refrigerant from leaking from the compression chamber radially inside the spiral body of the scroll to the compression chamber radially outside, and A backup member is omitted.

B) Means for Solving the Problems The present invention provides a fixed scroll in which a first spiral body is provided on an end plate, and a second spiral body that faces and meshes with the first spiral body. A movable scroll provided on a plate, and an electric element that gradually compresses the suction fluid between the spiral bodies and moves it from the outside to the center of the compression chamber by driving the movable scroll. A concave groove is provided extending along an end surface of the spiral body, a chip seal having substantially the same shape as the concave groove is disposed in the concave groove, and a tip seal is disposed on the inside of the concave groove in the radial direction. A chamfered portion is provided at the corner adjacent to the rear end of the side surface.

(E) Function According to the present invention, the chip seal is brought into close contact with the radially outer side surface of the concave groove due to the pressing force of the compressed refrigerant acting on the chamfered portion, and the sealing action due to this close contact allows the compressed refrigerant to move into the inner compression chamber. leakage from the inside to the outer compression chamber is prevented. The sealing action is achieved by utilizing refrigerant pressure without the need for a backup member, thus eliminating the need for a backup member.

(f) Example Next, one embodiment of the present invention will be described.

In FIG. 1, reference numeral (1) denotes a closed container in which an upper compression element (2) and a lower electric element (3) are housed.

(4) is a frame that constitutes a part of the compression element (2), and is fixed to the inner wall of the closed container +13. (5
) is a fixed scroll attached to a frame (4), which has a first spiral body (7) in an involute curve form in the center of a disc-shaped end plate (6), and a skirt part (8) at the outer peripheral end. ) is formed. (9) is a fixed scroll (5
) is a movable scroll disposed opposite to the first spiral body (7), and a second spiral body 1]1 that faces and meshes with the first spiral body (7).
is formed on the end plate IIυ. The second spiral body flG is formed in an involute curve like the first spiral body (7). (17J is the frame (4)
By completely locking the movable scroll (9) with the Oldham ring fixed to the movable scroll (9), the rotation of the movable scroll (9) relative to the fixed scroll (51) is prevented. (13 is a suction pipe, which is connected to the frame (4) It opens into a space I defined by a fixed scroll (5).The air in the space (14) is
It is taken into a compression chamber a9 formed between the fixed scroll (5) and the movable scroll (9). αe is compression chamber a
A high-pressure chamber communicates with the discharge port fin in the center of S, and the end plate (6) of the fixed scroll (5) and the closed container (1)
). The α shaft is a discharge pipe communicating with the high pressure chamber ae, and is installed through the closed container +13.

Reference numeral 9 is a stator constituting a part of the electric element (3), 2 is a rotor disposed inside the stator α9, and 2 is a rotating shaft fixed to the rotor 2. is the rotation axis (2υ
The crank part formed at the upper end of the movable scroll (
9) is engaged with the boss part via a sliding bearing @.

In the electric element (3), a gaseous fluid is sucked between the movable scroll (9) and the fixed scroll (5) by causing the movable scroll (9) to revolve on a circular orbit, and the gaseous fluid is sucked between the movable scroll (9) and the fixed scroll (5). It functions to reduce and compress the volume while moving the fluid from the outside toward the center together with the cavity (15a) formed between both spiral bodies 171 (14).

The surface spiral body (71C1G) has a concave groove 120 extending along the end surface as shown in FIG. As shown in Fig. 3, this tip seal is achieved by providing a chamfered portion ω at the corner adjacent to the rear end of the radially inner side surface (2) of the concave groove. Compressed refrigerant flows into the space C1υ on the back side of ω from a part where the chip seal is divided (not shown), and the pressing force of this compressed refrigerant acts on the chamfered part ω, and the horizontal part of the pressing force of this chamfered part The force urges the tip seal to the outside in the radial direction of the spiral body 171111, so that the tip seal comes into close contact with the radially outer side surface of the concave groove (2+3). Due to the sealing action due to this close contact, Compressed refrigerant is prevented from leaking from the radially inner compression chamber (15 in) to the radially outer compression chamber (15out).

In the scroll compressor, during normal compression operation, the fluid flowing into the space I from the suction pipe (13) is taken between the movable scroll (9) and the fixed scroll (5), which revolve around each other on a circular orbit, and the fluid flows between both scrolls. (51 (91 spiral body (7)) is compressed by sealing it in the cavity (15a) between 11 and gradually reducing this cavity (15a) and moving it to the center, and then compressing it in the compression chamber fi51. It is discharged from the central discharge boat (1f), etc., and further discharged from the discharge pipe to the outside of the closed container (11) through the high pressure chamber (1 gJ).

In addition, in the scroll compressor, there is a radially inner compression chamber (15 inches) to a radially outer compression chamber (15 out).
When the compressed refrigerant tries to leak to the refrigerant, the tip seal contacts the radially outer side surface of the concave groove, thereby blocking the leak passage and preventing the leak.

(G) Effects of the Invention Since the number of grooves of the present invention is as described above, the chip seal is brought into close contact with the radially outer surface of the concave groove due to the pressing force of the compressed refrigerant acting on the chamfered portion, and the sealing action due to this contact is enhanced. This prevents the compressed refrigerant from leaking from the radially inner compression chamber to the radially outer compression chamber, thereby providing a scroll compressor with high operating efficiency.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of an embodiment of the present invention, FIG. 2 is an exploded perspective view of a part of the embodiment, and TGS is a longitudinal sectional view of a main part of the embodiment. (Death...Electric element, (5)...Fixed scroll,
(6)... end plate, (7)... first spiral body,
(91...movable scroll, all...second spiral body, αυ...end plate, (old...compression chamber, )・
...End face, (to)...Concave groove, Punishment...Chip seal, 1...Radially inner side surface, of...Rear end,
CO... Chamfered part.

Claims (1)

[Claims] (1) A fixed scroll in which a first spiral body is provided on an end plate, a movable scroll in which an end plate is provided with a second spiral body that faces and engages with the first spiral body, and the movable scroll an electric element that gradually compresses the suction fluid between the spiral bodies and moves it from the outside of the compression chamber toward the center by driving the spiral body along the end surface of the spiral body. A concave groove is extended, a tip seal having substantially the same shape as the concave groove is disposed in the concave groove, and a chamfered portion is provided at a corner of the tip seal adjacent to a rear end of a radially inner surface of the concave groove. A scroll compressor characterized by: