JPH10169573A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability by preventing generation of a partial contact with a thrust pad positively, and ensuring smooth revolving movement of a revolving scroll even if the end plate part of the revolving scroll is deformed by an influence that pressure increases more as it approaches its center more, which is one of scroll compressing mechanism characteristics. SOLUTION: This compressor is constituted so that the volute blade part 12b of a fixed scroll 12 and the volute blade part 11b of a revolving scroll 11 may engage with each other, and a compression action may be conducted by forming a compression space out of these blade parts and end plate parts 12a, 11a of respective scrolls. In the revolving scroll end plate part, an elastic deformation part D for partially-reducing the rigidity of the end plate part is provided, which is formed into an annular shape along a circumferential direction at a more inward position than the sliding-contact position of a thrust pad 2a which supports the end plate part so as to revolve freely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used as a compressor constituting a refrigeration cycle of an air conditioner, for example.

[0002]

2. Description of the Related Art For example, in a compressor constituting a refrigeration cycle of an air conditioner, a scroll type compressor having low motion noise, requiring no components such as a suction valve and a discharge valve, requiring only a small number of parts, and having good compression performance. Machines tend to be heavily used.

[0003] In this type of scroll compressor, the spiral wings of a fixed scroll and the spiral wings of an orbiting scroll are engaged with each other, and a compression space is formed by these wings and the end plate of each scroll. In addition, the orbiting scroll is caused to orbit, so that the refrigerant gas is sucked into the compression space, compressed and discharged.

[0004]

By the way, in such a scroll type compressor, a thrust force for opening the fixed scroll and the orbiting scroll in the axial direction is generated during the compression operation. Conventionally, a thrust force has been received by supporting the orbiting scroll head with a thrust receiver formed on a support frame.

However, as a feature of the scroll-type compression mechanism, the pressure increases toward the center, so that the orbiting scroll head is easily deformed into a spherical shape. On the other hand,
The thrust receiver is formed integrally with the support frame that supports the fixed scroll, and has higher rigidity than the rigidity of the orbiting scroll head.

When the orbiting scroll end plate is deformed into a spherical shape, a part of the bottom surface of the end plate is pressed against the inner peripheral edge of the thrust receiver, and the outer end of the end plate warps so as to be separated from the thrust receiving surface. Eventually, the end plate portion was hit against the thrust receiver, and the hit portion was abnormally worn or burned.

Japanese Patent Publication No. 2-1995 discloses a technique for solving such a problem. The feature is that a gap is provided between the thrust bearing and a bearing support that supports the outer peripheral side of the bearing so that the inner peripheral side of the thrust bearing can be slightly changed.

[0008] Even if the end plate portion of the orbiting scroll is distorted by the axial thrust force generated by the compression action, the thrust bearing itself receiving the thrust force is distorted in accordance with the deformation of the end plate portion, so that there is no one-side contact. .

However, in this case, since the orbiting scroll head plate and the thrust bearing are deformed into a spherical shape, the spiral wing of the orbiting scroll is deformed in a state where the tip is inclined inward. For this reason, the wings of the orbiting scroll cannot maintain the meshing state parallel to the wings of the fixed scroll, and the sealing performance between the wings deteriorates.

Further, while the crankshaft of the rotary shaft for driving the orbiting scroll rotates in a parallel plane, the boss projecting from the mirror surface engaging with the crankshaft is deformed into a spherical shape. Therefore, here also, one-sided contact occurs, which causes abnormal wear and noise.

The present invention has been made in view of the above circumstances, and an object of the present invention is that the orbiting scroll head plate is deformed under the influence of increasing pressure toward the center part peculiar to the scroll compression mechanism. However, it is intended to provide a scroll compressor that reliably prevents a single contact with a thrust receiver, ensures smooth orbiting movement of an orbiting scroll, obtains high compression efficiency, and improves reliability. It is.

[0012]

According to a first aspect of the present invention, there is provided a scroll type compressor in which a spiral wing of a fixed scroll is meshed with a spiral wing of a orbiting scroll. In the scroll compressor in which a compression space is formed by the wings and the end plates of the scrolls to perform a compressing action, the end plate of the orbiting scroll is provided with a thrust receiver that supports the end plate in a freely rotatable manner. It is formed annularly along the circumferential direction inside the sliding contact part,
An elastic deformation means for partially reducing the rigidity of the end plate portion is provided.

According to a second aspect, in the scroll type compressor according to the first aspect, the elastic deformation means is an elastic deformation portion made of a material having a smaller elastic coefficient than a constituent material of the end plate portion.

According to a third aspect of the present invention, in the scroll compressor according to the first aspect, the elastic deformation means is a thin portion formed to be thinner than a thrust receiving and sliding contact portion of the end plate portion.

According to a fourth aspect, in the scroll compressor according to the first aspect, the elastic deformation means is a ring-shaped groove provided on at least one surface of the end plate.

By providing means for solving the above-mentioned problems, according to the invention of claims 1 to 4,
Even if the center of the compression mechanism becomes hot during compression, the center of the orbiting scroll is only displaced in the axial direction, so that there is no side contact with the thrust receiver, and the orbiting scroll wings and the fixed scroll Secure seal between wings.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described.
This will be described with reference to the drawings. FIG. 1 shows a scroll compressor used in a refrigeration apparatus, for example, with a part thereof omitted. In the figure, reference numeral 1 denotes a sealed case, and a support frame 2 is provided in an upper portion of the sealed case 1 and rotatably supports a rotating shaft 3.

The rotary shaft 3 has a compression mechanism 4 to be described later.
And a motor unit 7 including a stator 5 and a rotor 6 is provided below. The lower end of the rotating shaft 3 protrudes downward from the motor unit 7 and is rotatably supported by a sub-bearing (not shown) attached to the closed case 1.

The compression mechanism 4 is configured as follows. That is, the orbiting scroll 11 rotatably supported by the thrust receiver 2a formed on the upper surface of the support frame 2, the fixed scroll 12 meshed with the orbiting scroll, and the fixed scroll supported to be movable in the axial direction. It comprises a support means 13 and a back pressure guide means 14 for applying a gas pressure to the back side of the fixed scroll 12.

The orbiting scroll 11 has a mirror plate 11a.
And a spiral wing portion 1 integrally formed on the upper surface of the mirror surface portion.
1b and the mirror surface portion, and the rotating shaft 3
And a boss 11c engaged with the crankshaft 3a provided at the upper end of the boss. An outer peripheral portion of the bottom surface of the end plate portion 11a is supported by the thrust receiver 2a, and a predetermined portion is engaged with the support frame 2 via the Oldham ring 10.

The orbiting scroll head 11a has an elastic deformation means D which will be described later. The elastically deforming means D is located inside the inner peripheral edge of the thrust receiver 2a on the upper surface of the support frame 2 and on the outer peripheral side of the orbiting scroll wing 11b.

The elastically deforming means D includes a mirror plate 11a.
The elastic deformation portion is made of a material having a smaller elastic coefficient than that of the constituent material and easily deformed elastically. The end plate portion 11a other than the elastically deformable portion D is a rigid metal body and is not easily deformed unless a special load is applied. However, since the elastically deformable portion D itself is easily elastically deformed, the end plates on both sides are separated from this. Part 11
The portion a can be freely displaced within the elastic deformation range of the elastic deformation portion D.

In addition, to explain, usually, the orbiting scroll 1
1 is forged using an aluminum alloy material together with the fixed scroll 12. Here, an aluminum alloy material having a reduced silicon content in the original aluminum alloy material is prepared, in particular, so as to constitute the elastically deformable portion D in a part of the orbiting scroll 11, and the corresponding portions are formed by powder forging means. It is integrally molded.

On the other hand, the fixed scroll 12 is a spiral plate having a mirror plate portion 12a and a wing portion 11b of the orbiting scroll 11 which is integrally protruded from the lower surface of the mirror plate portion 12a and in which the side surfaces thereof are in mesh with each other. And wings 12b.

A pair of compression spaces S is formed by the end plates 11a, 12a and the wings 11b, 12b of the orbiting and fixed scrolls 11, 12, and a refrigerant gas is taken in from the compression space on the peripheral end side to form a center. It moves to the compression space on the part side and reduces its volume, so that the compression action can be performed.

A flange portion 12c is formed on the outer periphery of the fixed scroll end plate portion 12a, and loosely sandwiches the orbiting scroll end plate portion 11a together with the thrust receiver 2a. This holding position is located outside the elastically deformable portion D provided on the end plate portion 11a, and this portion is loosely fixed.

On the inner peripheral side from the elastic deformation portion D, the orbiting scroll wing 11b is engaged with the fixed scroll wing 12b,
Further, since the orbiting scroll boss portion 11c only engages with the crankshaft portion 3a and is not clamped, the orbiting scroll boss portion 11c can be freely displaced.

On the other hand, a discharge port 15 is provided in the center of the upper surface of the fixed scroll end plate portion 12a so as to communicate with the spiral center of the compression space S. In the periphery of the discharge port 15, two ridges 1 having different radii around the port are provided.
6a and 16b are integrally formed to protrude, and an intermediate pressure introducing hole 17 is provided between the upper and lower surfaces thereof.

Above the fixed scroll 12, a back pressure plate 18 for partitioning the inside of the sealed case 1 into an upper end space and a lower space is fixedly mounted. The back pressure plate 18 has a check valve 1 at the center.
9 is provided and communicates with the discharge port 15.

On the lower surface side of the back pressure plate 18 around the valve seat 20, a ridge 21a and a step 21b are provided with a radius slightly larger than the radii of the ridges 16a and 16b.

The adjacent ridges 16a and 21a, 16b and 2
Seal rings 22a and 22b are interposed between 1b, respectively. Therefore, even if the fixed scroll 12 moves in the axial direction within the predetermined range, the seal between the adjacent ridges is completed.

The periphery of the discharge port 15 and the back pressure plate valve seat 2
0, a high pressure discharge chamber 22 is formed, and a space formed between the ridges 16a and 21a, 16b and 21b adjacent to each other becomes an intermediate pressure chamber 23 which communicates with the intermediate pressure introduction hole 17. The back pressure guide means 14 is constituted by.

The support means 13 includes a guide pin 27 and a mounting bolt body 32. Guide pin 27
The upper end is press-fitted and fixed to the fixed scroll flange portion 12c, and the lower portion protrudes downward from the flange portion. On the other hand, the support frame 2 is provided with a plurality of hook holes 28,
The protruding lower part of the pin 27 is slidably inserted.

Further, a plurality of guide holes 30 are provided in the flange portion 12c, and a screw hole 31 is provided in a portion of the support frame 2 facing the guide holes. Guide hole 3
The mounting bolt 32 is inserted into the screw hole 31, and the screw portion is screwed into the screw hole 31.

The lower end surface of the cylindrical portion of the mounting bolt body 32 is in contact with the surface of the support frame 2, and the upper end portion slightly projects from the upper surface of the flange portion 12c. That is, the head of the mounting bolt body 32 is mounted so as to have a predetermined gap from the flange portion 12c, and the support means 13 is constituted by these.

A discharge pipe 33 is connected to an upper side surface of the closed case 1 and communicates an upper space in the closed case 1 partitioned by the back pressure plate 18 with a condenser (not shown) of the refrigerating apparatus.

A suction pipe 3 is provided on a lower side surface of the closed case 1.
4 is connected, and communicates a lower space in the sealed case 1 partitioned by the back pressure plate 18 with an evaporator (not shown) of the refrigeration apparatus.

In the scroll compressor constructed as described above, when the electric motor 7 is energized to drive the compression mechanism 4, low-pressure refrigerant gas is introduced into the closed case 1 from the suction pipe 34. , The space below the back pressure plate 18 is filled.

The refrigerant gas is sucked into the outer peripheral side of the compression space S formed by the orbiting scroll 11 and the fixed scroll 12. Then, the orbiting scroll 11 is gradually transferred to the center with the orbiting motion of the orbiting scroll 11, and is compressed due to a decrease in space capacity.

When the pressure has risen to a predetermined value, the pressure is discharged from the discharge port 15 to the space above the back pressure plate 18 through the high-pressure discharge chamber 22, and further guided to an external condenser through the discharge pipe 33.

Incidentally, depending on the operating conditions, the liquid refrigerant may be sucked into the compression space S, and at this time, the pressure is increased to an abnormally high pressure. The pressure in the compression space S exceeds the back pressure of the back pressure guide means 14, and the fixed scroll 12 moves in the axial direction.

Guide pin 2 integral with fixed scroll 12
7 is lifted up by being guided by the retaining hole 28 of the support frame 2, and as a result, the clearance of the compression space S formed by the orbiting scroll 11 is increased.

The abnormally high pressure gas in the compression space S
The scroll escapes into a so-called compliance function, and the wings 11b, 12
The stress received by b is eliminated. Fixed scroll 12
Is raised to some extent, this flange portion 25
The upper surface comes into contact with the head of the mounting bolt body 32, and further lifting is restricted.

As shown particularly in FIG. 2, a feature of this kind of scroll-type compression mechanism is that a compression space S at the center is provided.
The higher the degree of compression is, the higher the temperature becomes. Therefore, the wings 11b and 12b of each of the scrolls 11 and 12 are stretched under the influence of heat toward the center.

At the same time, the back pressure guiding means 14 including the high pressure discharge chamber 22 and the intermediate pressure chamber 23 formed on the back side of the fixed scroll 12 applies the back pressure F to the fixed scroll.
As a result, the fixed scroll 12 is pressed in the direction of the orbiting scroll 11, and this force acts as a force for deforming the orbiting scroll 11 downward.

In the orbiting scroll head 11a,
Since the thrust receiving sliding contact portion is supported by the thrust receiving portion 2a, this portion only receives a downward deforming force, and does not actually change at all.

However, in the portion inside the thrust receiving and sliding contact portion of the end plate portion 11a, there is no member supporting the end plate portion together with the elastically deformable portion D. The boss portion 11c integrated with the end plate portion 11a is only engaged with the crankshaft portion 3a, and is not substantially supported.

Therefore, the elastically deforming portion D interposed between the sliding contact portion supported by the thrust receiver 2a and the inner portion is elastically deformed, and the inner portion is shown by a two-dot chain line in FIG. Deforms along the axial direction as shown by. (Note that
In the figure, the degree of deformation is shown extremely large because it is schematically shown).
The thrust receiving / sliding contact portion a is kept in the same plane, so that the end plate portion has no contact and there is no room for partial wear. The end plate portion 11a always makes a revolving motion along the plane of the thrust receiver 2a, smooth motion is guaranteed, and high compression efficiency is maintained.

The portion of the orbiting scroll 11 inside the elastically deforming portion D is deformed along the axial direction, while the fixed scroll 12 is deformed in the axial direction by the action of the back pressure guiding means 14.

Therefore, the scrolls 11 and 12 of each other are
The wings 11b and 12b move only in the axial direction and do not tilt, so that the meshing state does not change and there is no influence on the sealing performance.

In the above-described embodiment, the elastically deforming means D is an elastically deformable portion made of a material having a smaller elastic coefficient than the material forming the end plate portion 11a. However, the present invention is not limited to this. It may be configured as follows.

For example, as shown in FIG. 3, the elastically deforming means D is a thin portion Da formed thinner than the thrust receiving and sliding contact portion of the end plate portion 11a. In FIG.
a from the inner peripheral edge of the thrust receiving sliding contact portion to the boss portion 11.
Although provided over the outer peripheral edge of the base end portion c, it may be formed only at the same portion as the elastically deformed portion D described above.

In any case, the thin plate portion Da is used for the end plate portion 11.
a is easily deformed in the axial direction due to a decrease in rigidity, but the thrust receiving portion of the end plate portion and the thrust receiving portion 2a are kept flush with each other, and there is no partial contact, no partial wear occurs, and the thrust receiving portion 2a is smooth. High compression efficiency is obtained through a simple swiveling motion.

Wings 11 of scrolls 11 and 12 of each other
Since b and 12b only move along the axial direction and do not tilt, the meshing state does not change and there is no influence on the mutual sealability.

As shown in FIG. 4, as elastic deformation means,
On the upper surface of the orbiting scroll head 11a, the thrust receiver 2
A ring-shaped groove Db formed in an annular shape along the circumferential direction may be formed inside a portion facing the sliding contact portion with the portion a.

As shown in FIG. 5, as elastic deformation means,
On the lower surface of the orbiting scroll head 11a, the thrust receiver 2
A ring-shaped groove Dc formed in an annular shape along the circumferential direction may be provided inside a portion facing the sliding contact portion with a.

In any case, the ring-shaped grooves Db, Dc
As a result, the rigidity of the end plate portion 11a is reduced and the end plate portion 11a is easily deformed in the axial direction. And achieves a high compression efficiency by performing a smooth turning motion.

Since the wings 11b and 12b of the scrolls 11 and 12 move only in the axial direction and do not tilt, the meshing state does not change and there is no influence on the sealing performance.

The ring-shaped grooves Db and Dc serving as the elastic deformation means shown in FIGS.
Although provided on the upper surface and the lower surface of a, respectively, the present invention is not limited to this, and there is no problem even if the ring-shaped grooves are provided in the same portions on both the upper and lower surfaces.

The above-mentioned scroll type compressor is not necessarily limited to the one provided in the equipment constituting the refrigeration cycle, and can be used for compressing other types of compressed gas or air.

[0061]

As described above, according to the first aspect of the present invention, the rigidity of the end plate portion of the end plate portion of the orbiting scroll is annularly formed along the circumferential direction inside the sliding contact portion with the thrust receiver. An elastic deformation means for partially lowering is provided.

According to the second aspect of the present invention, the elastically deforming means is an elastically deformable portion made of a material having a smaller elastic coefficient than the constituent material of the end plate portion. According to the third aspect of the present invention, the elastic deformation means is a thin portion formed to be thinner than the thrust receiving sliding contact portion of the end plate portion.

According to the fourth aspect of the present invention, the elastic deformation means is a ring-shaped groove provided on at least one surface of the end plate. Therefore, according to the first to fourth aspects of the present invention, even if the orbiting scroll head plate is deformed due to the effect that the pressure increases toward the center part peculiar to the scroll compression mechanism, the one-sided contact with the thrust receiver is ensured. To prevent the occurrence of partial abnormal wear. And
The sliding contact portion of the orbiting scroll head plate portion with respect to the thrust receiver keeps a flat surface, and the orbiting scroll performs a smooth orbiting motion, thereby achieving high compression efficiency and improving reliability. .

[Brief description of the drawings]

FIG. 1 is a vertical cross-sectional view showing one embodiment of the present invention, in which a part of a scroll compressor is omitted.

FIG. 2 is an exemplary view for explaining a deformed state during compression according to the embodiment;

FIG. 3 is a vertical sectional view of an orbiting scroll according to another embodiment.

FIG. 4 is a longitudinal sectional view of an orbiting scroll according to still another embodiment.

FIG. 5 is a vertical sectional view of an orbiting scroll according to still another embodiment.

[Explanation of symbols]

12 ... fixed scroll, 12b ... (fixed scroll)
Wings, 11 ... orbiting scroll, 11b ... Wings (of orbiting scroll), 12a ... Wings (of fixed scroll), 11
a: Wing (of the orbiting scroll), S: compression space, D: elastic deformation, Da: thin portion, Db, Dc: ring-shaped groove.

Claims (4)

[Claims] A scroll in which a spiral wing portion of a fixed scroll and a spiral wing portion of an orbiting scroll are meshed with each other, and a compression space is formed by the wing portion and the end plate portion of each scroll to perform a compression action. In the compressor, the end plate portion of the orbiting scroll is formed in an annular shape along the circumferential direction inside a sliding contact portion with a thrust receiver for rotatably supporting the end plate portion, and partially reduces the rigidity of the end plate portion. A scroll compressor comprising an elastically deforming means for lowering the pressure. 2. The scroll compressor according to claim 1, wherein said elastically deforming means is an elastically deformable portion made of a material having a smaller elastic coefficient than a constituent material of said end plate portion. 3. The scroll-type compressor according to claim 1, wherein said elastically deforming means is a thin portion formed thinner than a thrust receiving and sliding contact portion of the end plate portion. 4. The scroll compressor according to claim 1, wherein said elastic deformation means is a ring-shaped groove provided on at least one surface of the end plate.