JP2538877B2 - Scroll fluid machinery - Google Patents

Description

The present invention relates to a spiral shape applied to a scroll of a scroll fluid machine.

[Conventional technology]

A scroll compressor, which is a type of scroll fluid machine, will be described.

As shown in the operating principle diagram of FIG. 8, the conventional scroll type compressor fixes one of the two vortex bodies of the same shape to a seal end plate having a discharge port 4 at the substantially center, and both are shown in FIG. As shown, the relative rotation is 180 °, and the two spiral bodies contact each other at the four points 51, 52 and 51 ', 52', so that the distance 2ρ (= pitch of the spiral-2 x spiral). (The plate thickness) relative to each other, and they are overlapped with each other, one spiral body 2 is fixed, and the other spiral body 1 is fixed.
Is constituted by a crank mechanism having a crank radius ρ so as to perform an orbital motion with a radius ρ = OO ′ without rotating about the center O of the one spiral body 2.

Then, between the two spiral bodies 1 and 2, there are formed the small chambers 3 and 3 sealed between the points 51 and 52 and the points 51 ′ and 52 ′ where the spiral bodies contact each other, and the volume of the sealed small chambers 3 and 3 is increased. Gazumaki 1
Gradually changes with the revolution of.

That is, from the state shown in FIG.
When it revolves 90 °, it becomes the same figure (2), when it revolves 180 °, it becomes the same figure (3), and when it revolves 270 °, it becomes the same figure (4). During this time, the volume of the small chamber 3 gradually decreases, Figure (4)
Then, the two small chambers 3, 3 communicate with each other to form a fluid chamber 53. When the orbit is further rotated 90 ° from the state of (4) in the figure, it becomes (1) in the same figure, and the volume of the fluid chamber 53 is The volume is reduced to the figure (3), and the volume becomes the minimum between the figure (3) and the figure (4). , (4) to (1) in the same figure, new gas is taken in to form a closed small chamber, and this is repeated, and the gas taken in from the space outside the vortex body is compressed and discharged from the discharge port 4. To be done.

The above is the operating principle of the scroll type compressor. Specifically, as shown in the vertical sectional view of FIG. 9, the scroll type compressor is such that the housing 10 includes the front end plate 11,
It consists of rear end plate 12 and cylinder plate 13,
The rear end plate 12 is provided with a suction port 14 and a discharge port 15, and a fixed scroll member 25 composed of a spiral body 252 and a disk-shaped end plate 251 is fixed, and a main shaft 17 having a crank pin 23 on the front end plate 11. Pivotally, and as shown in FIG. 10 (EE cross-sectional view of FIG. 9) on the crank pin 23, a radial needle bearing 26, an orbiting scroll member.
24 bosses 243, square tube members 271, sliding bodies 291, ring members 29
2. A revolving scroll member 24 including a spiral body 242 and a disc-shaped end plate 241 is attached via a revolving mechanism including a rotation stopper 293 and the like.

[Problems to be solved by the invention]

 This will be described with reference to FIGS. 5 to 7.

In order to prevent the compressed gas from leaking to the closed small chamber on the low pressure side adjacent to the closed small chamber that confine it, the spiral body of the portion where the spiral scroll 242 of the orbiting scroll and the end plate 251 of the fixed scroll contact each other. A chip seal 442 is attached to the 242 side, and a fixed scroll vortex body 252
A chip seal 452 is attached to the side of the spiral body 252 where the end plate 241 of the orbiting scroll contacts. In order to prevent damage to the chip seal 442 provided on the spiral scroll body, it is made considerably shorter than the chip seal 452 provided on the fixed scroll spiral body so as not to interfere with the discharge port 14 provided on the end plate 251. Further, as shown in the figure, the central portions of the spiraling bodies 242 and 252 close to the discharge port 14 are slightly wider than the other spiraling body portions, but are generally almost the same or slightly smaller than the discharge ports. is there.
Due to the above structure, the conventional one has the following drawbacks.

(1) Gas leaks from the tip portion of the vortex body 242 where the chip seal 442 does not exist in the central portion near the discharge port 14 and the performance is deteriorated.

(2) Since there is no space for inserting the crankpin directly in the center of the spiral body, the crankpin must be provided with a boss on the outside of the orbiting scroll 24 to support the shaft, and therefore the length in the axial direction is long. Therefore, the crankpin has to be thick in terms of strength and vibration.

[Means for solving problems]

The thickness of one of the spiral bodies at the center of the spiral body is extremely increased. The thickness of the central part of the other spiraling body is inevitably small because it is made so as to completely mesh with the other party. FIG. 1 and FIG. 2 solve the conventional problem (1), and the tip seal of the orbiting scroll is constructed by incorporating a discharge port in the central portion of the fixed scroll where the vortex body thickness is large. So that it does not come into contact with the discharge port. The conventional problem (2) is solved by Figs.
In this case, the thickness of the central portion of the spiral body on the side of the orbiting scroll is increased so that the crankpin can directly support the shaft.

[Action]

(1) When the profile thickness of the center of the fixed scroll is increased and the discharge port is provided inside, the tip seal of the orbiting scroll is not in contact with the discharge port and the chip seal must be installed up to the center. And the sealing effect is improved.

(2) When the profile thickness at the center of the spiral body of the orbiting scroll is increased and the crankpin is inserted into this, the axial length of the entire device decreases according to the axial length of the crankpin.

The moment acting on the crank pin is reduced and the vibration is reduced.

〔Example〕

(1) In FIGS. 1 and 2, 251 'is an end plate of a fixed scroll, 252' is a spiral body of the fixed scroll, and 45
2'is a chip seal, 242 'is an orbiting scroll spiral body, 442' is a chip seal, 14 'is a discharge port, and 94' is a discharge gas passage.

A discharge port 14 'is built in the thickened center portion of the spiral scroll 252' of the fixed scroll, and a passage 94 'leading to the discharge port is formed on the side surface of the spiral scroll 252'. As a result, since the discharge port 14 which is conventionally provided in the end plate of the fixed scroll is eliminated, the chip seal 442 'provided in the spiral scroll of the orbiting scroll has a sufficient length to the center of the spiral scroll 242'. be able to.

(2) In FIGS. 3 and 4, 241 ″ is an end plate of an orbiting scroll, 242 ″ is a spiral body of the orbiting scroll, and 27
1 ″ is a square tube member of the revolution mechanism, 23 ″ is a crank pin, 252 ″
Is a fixed scroll vortex.

A bearing is provided in the thickened central portion of the spiral body 242 ″ of the orbiting scroll, and the crank pin 23 ″ is inserted therein. As a result, the crank pin insertion part (243 in FIG. 9) that is conventionally provided outside the orbiting scroll member is eliminated,
The axial direction becomes shorter by this amount.

〔The invention's effect〕

(1) By making the profile thickness of the center of the spiral body of the fixed scroll extremely large and incorporating the discharge port in this part, the tip seal of the orbiting scroll is not in contact with the discharge port, and the chip seal is spirally wound. It can be attached even to the center of the body, and gas leakage from this part is eliminated compared to the conventional one.

(2) By making the profile thickness at the center of the spiral body of the orbiting scroll extremely large and inserting the crankpin into this portion, the axial structure becomes short, and the moment to the drive mechanism becomes small, It is advantageous in terms of strength and vibration.

[Brief description of drawings]

FIG. 1 is a schematic view showing the structure of the central portion of a spiral body in an embodiment of the scroll fluid machine of the present invention, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is another embodiment of the present invention. FIG. 4 is a schematic diagram showing the configuration of the central portion of the vortex body, FIG. 4 is a sectional view taken along the line BB of FIG. 3, FIG. 5 is a schematic diagram showing the configuration of the central portion of the vortex body in the conventional apparatus, and FIG. CC sectional view of FIG. 7, FIG. 7 is a DD sectional view of FIG. 5, FIG. 8 (1),
(2), (3) and (4) are operation principle diagrams of the scroll compressor, FIG. 9 is a vertical sectional view of a conventional scroll compressor, and FIG.
The drawing is a sectional view taken along line EE in FIG. 14 '... Discharge port, 24 ... Orbiting scroll, 25 ... Fixed scroll, 242', 252 '... Spiral body, 442', 452 '... Chip seal.

Claims (2)

(57) [Claims] 1. A pair of fixed scrolls 252 and orbiting scrolls 2 in which spiral bodies are erected on end plates 251 and 241, respectively.
42 and are meshed with each other by shifting the phase by 180 degrees, and a fluid chamber 53 is formed between the scrolls 252 and 242 equipped with chip seals 452 and 442 at the contact portion between the spiral body and the end plate, and the orbiting scroll 242 is formed. The fixed scroll 252
Revolving around a predetermined radius with the fluid chamber 53
In the scroll fluid machine that moves while changing the volume of the spiral scroll 242 of the orbiting scroll 242, the thickness of the central portion of the spiral scroll 252 'of the fixed scroll 252 is adjusted.
2 ′ is made thicker than the central portion, and the thickness of the central portion of the spiral body 242 ′ of the orbiting scroll 242 is set to the fixed scroll 252.
And the fixed scroll 252.
Provided at the center of the spiral body 252 'is a discharge port 14' which communicates with the fluid chamber 53 through a communication passage 94 'which is open at the side surface of the spiral body 252' and whose other end is open at the rear surface of the end plate 251. A scroll fluid machine characterized by that. 2. A pair of fixed scrolls 252 and orbiting scrolls 2 in which spiral bodies are erected on end plates 251 and 241, respectively.
42 and 180 are out of phase with each other and meshed with each other, and tip seals 452 and 442 are attached to a portion where the spiral body and the end plate are in contact with each other to form a fluid chamber 53 between the scrolls 252 and 242 and the orbiting scroll 242. In a scroll fluid machine that revolves around the fixed scroll 252 with a predetermined radius and moves while changing the volume of the fluid chamber 53, the thickness of the central portion of the spiral body 242 ″ of the orbiting scroll 242 is Spiral body 252 ″ of the fixed scroll 252
Thicker than the thickness of the center of the spiral scroll 242 ″ of the fixed scroll 252, and the end plate of the center of the spiral body 242 ″ of the orbiting scroll 242. A crank pin insertion hole that opens on the back side of 241 is provided, and in the crank pin insertion hole,
A scroll fluid machine characterized in that a crank pin (23) provided at one end of a main shaft (17) for revolving the orbiting scroll (242) is inserted.