JP6553968B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor that includes a fixed scroll member and a movable scroll member, and compresses fluid by changing the volume of a sealed space formed by these members.

As a scroll type compressor, a scroll type compressor as shown by patent documents 1 is known well.
This includes a fixed scroll member and a movable scroll member that revolves in contact with the fixed scroll member and forms a sealed space in which the volume changes according to the revolution between the fixed scroll member.

  In addition, the housing of this compressor has a first housing (center housing) that receives the thrust force of the movable scroll member via the thrust plate at the end face of the inner peripheral portion, and a second housing (rear housing) In the outer peripheral portion, the side plate (end plate) of the fixed scroll member is sandwiched between the end portion of the center housing and the end portion of the rear housing.

  In the compressor, fluid leakage from axial gaps between the enclosed space, in particular, between the center housing and the fixed scroll member, and between the fixed scroll member and the rear housing is avoided. Cylindrical gaskets are interposed between the center housing and the end plate of the fixed scroll member, and between the end plate of the fixed scroll member and the rear housing, respectively.

  Here, for example, as shown in Patent Document 2, in order to reduce the size of the compressor, the center housing has, on the outer periphery thereof, a first end joined to the outer periphery of the rear housing, and the first housing. An end plate of the fixed scroll member is held by the second end portion and the outer peripheral portion of the rear housing, having a second end portion recessed toward the thrust plate on the inner peripheral side than the end portion. The structure is known.

Japanese Patent Application Laid-Open No. 56-129791 Japanese Patent Application Laid-Open No. 57-179302

  By the way, in the compressor as shown in Patent Document 2, in order to avoid the leakage of the fluid, it is replaced by an O-ring disposed in a groove formed at the first end, and an annular member having a better sealing property. It is conceivable to interpose a gasket at the junction of the center housing and the rear housing. And it is thought that sealing performance is improved by fastening housings by bolts.

  Although the gasket is excellent in sealing performance, it has an influence on the assembly of the compressor because it is interposed in the joint. In particular, the scroll compressor requires clearance management in units of μm for sealing the sealed space. However, since the gasket has a tolerance of at least about 50 μm from its thickness, the sealed space cannot be sealed.

  Further, since the fixed scroll member is directly sandwiched between the second end of the center housing and the rear housing, the stability of holding the fixed scroll member in the housing is impaired.

  In view of such a practical situation, the present invention reduces permeation leakage by using a gasket, while absorbing (cancelling) tolerances from the dimension value of the thickness of the gasket to improve sealing performance and stabilize the fixed scroll member. The purpose is to make it possible to

The scroll compressor according to the present invention is
Fixed scroll members,
A movable scroll member that revolves in contact with the fixed scroll member and forms a sealed space that changes in volume with the revolution between the fixed scroll and the fixed scroll;
The fixed scroll member and the movable scroll member are accommodated, the thrust force of the movable scroll member is received at the end surface of the inner peripheral portion, the outer end portion has a first end portion and an inner peripheral portion than the first end portion. A first housing having a second end formed at a position lower than the first end and abutting against an end plate of the fixed scroll member;
A first outer peripheral portion joined to the first end portion and an end plate of the fixed scroll member are joined to the outer peripheral portion, and the end plate of the fixed scroll member is sandwiched together with the second end portion. And a second housing having two outer peripheral portions.

  Here, the scroll compressor is provided on the inner peripheral side of the first gasket portion interposed between the first end portion and the first outer peripheral portion, and the first gasket portion. And further comprising an annularly formed gasket integrally having a second gasket portion interposed between the end plate of the fixed scroll member and the second outer peripheral portion. It is characterized by

According to the present invention, the gasket having the first gasket portion and the second gasket portion is provided between the first end portion and the first outer peripheral portion, and between the end plate of the fixed scroll member and the first end portion. It is interposed between two outer peripheral parts.
Therefore, compared with the case where the gasket having only the first gasket portion is interposed between the first end portion and the first outer peripheral portion, the tolerance from the dimensional value of the thickness of the gasket is smaller. Since the offset is achieved, the sealability can be improved and the fixed scroll member can be stably held.

Cross-sectional view of a scroll compressor according to an embodiment of the present invention Principal part enlarged sectional view of FIG. 1 A-A sectional view of FIG. 1 B-B sectional view of FIG. 3 Schematic showing the shape of the gasket before it is inserted into the joint between the housings The schematic which demonstrates the influence which it has on the amount of crushing of a gasket in the case where a gasket same as the above and the gasket which has only the 1st gasket part are used.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a cross-sectional view of a scroll compressor according to an embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of an essential part of FIG.
The scroll compressor 1 according to the present embodiment is a so-called inverter-integrated compressor that is provided in, for example, a refrigerant circuit of a vehicle air conditioner and sucks, compresses and discharges the refrigerant of the vehicle air conditioner. A compression mechanism 10, a drive mechanism 20 for driving the compression mechanism 10, an inverter 30 for driving the drive mechanism 20, and a cylindrical shape that houses the compression mechanism 10, the drive mechanism 20, and the inverter 30 therein And a housing 40.

  The compression mechanism 10 includes a fixed scroll member 2 and a movable scroll member 3 which are disposed to face each other in the direction of the central axis (O shown in FIG. 1). The fixed scroll member 2 is formed by integrally forming a spiral wrap 2b on an end plate 2a. Similarly, the movable scroll member 3 is formed by integrally forming a spiral wrap 3b on an end plate 3a.

  Both scroll members 2 and 3 mesh both spiral wraps 2b and 3b, the end of the spiral wrap 2b on the protruding side contacts the end plate 3a, and the end of the spiral wrap 3b on the protruding side contacts the end plate 2a. Are arranged to A tip seal is embedded in the end edge of the spiral wraps 2b and 3b on the protruding side.

  The scroll members 2 and 3 are disposed such that the side walls of the spiral wraps 2b and 3b are partially in contact with each other with the circumferential angles of the spiral wraps 2b and 3b offset from each other. As a result, a fluid pocket 4 is formed between the spiral wraps 2b and 3b, which is a crescent-shaped sealed space as viewed from the central axis direction.

  The movable scroll member 3 is revolved on a circular orbit about a central axis by a drive mechanism 20 described later, and rotation is prevented. Thereby, the volume of the fluid pocket 4 changes in the contraction direction by moving the fluid pocket 4 formed between both the spiral wraps 2b, 3b from the outer end of the spiral wraps 2b, 3b toward the central portion . Therefore, the fluid (for example, refrigerant gas) taken into the fluid pocket 4 from the outer end side of the spiral wrap 2b, 3b is compressed.

  The drive mechanism 20 has an electric motor 21 and a rotation prevention mechanism, and a three-phase alternating current motor, for example, is applied to the electric motor 21. For example, a direct current from a battery (not shown) of the vehicle is converted into an alternating current by the inverter 30 and supplied to the electric motor 21.

  The electric motor 21 has a drive shaft 22, and the drive shaft 22 is rotatably supported at the center of a front housing 7 described later. The tip end side of the drive shaft 22 is connected to the movable scroll member 3. Therefore, the movable scroll member 3 is pivoted by the rotation of the drive shaft 22. On the other hand, although not described in detail here, the rotation prevention mechanism regulates the rotation of the movable scroll member 3, thereby preventing the rotation of the movable scroll member 3.

  As shown in FIG. 1, the housing 40 of the scroll compressor 1 includes a center housing (first housing) 5 that houses the compression mechanism 10, and a rear housing (second housing) 6 disposed on the rear side. And a front housing (third housing) 7 disposed on the front side of the center housing 5 and accommodating the drive mechanism 20 and the inverter 30, and an inverter cover 8. The housings 5, 6, 7 and the inverter cover 8 are each formed by casting, and are integrally fastened by fastening means such as a plurality of bolts 9 to constitute the housing 40.

  In the present embodiment, the center housing 5 has a structure that houses the fixed scroll member 2 and the movable scroll member 3. The center housing 5 is closed by the end plate 2 a of the fixed scroll member 2 on the rear housing 6 side.

  The center housing 5 also has a thrust receiving portion 12 that receives the end plate 3a of the movable scroll member 3 via the thrust plate 11 on the inner peripheral portion in order to support the movable scroll member 3 in the thrust direction. The thrust receiving portion 12 is in a position recessed in the axial direction from the end portions 5 a and 5 b on the rear housing 6 side of the center housing 5.

The center housing 5 also has a first end portion 5a joined to the outer peripheral portion of the rear housing 6 on the outer peripheral portion facing the rear housing 6, and a position on the inner peripheral side with respect to the first end portion 5a. The second end portion 5b is formed lower than the first end portion 5a (that is, formed to be recessed toward the thrust plate 11 in the central axis direction) and abuts against the end plate 2a of the fixed scroll member 2. .
That is, a stepped portion that is recessed from the first end portion 5 a toward the second end portion 5 b is formed on the outer peripheral portion of the center housing 5.

The rear housing 6 has a first outer peripheral portion 6a joined to the first end 5a of the center housing 5 at its outer peripheral portion, and an end of the fixed scroll member 2 on the inner peripheral side of the first outer peripheral portion 6a. It has the 2nd outer peripheral part 6b joined to the board 2a.
That is, the center housing 5 and the rear housing 6 are fastened by the bolt 9 in a state where the first end 5a and the first outer peripheral portion 6a are joined, and the end plate 2a of the fixed scroll member 2 is the center housing It is pinched by the second end 5 b of the second part 5 and the second outer peripheral part 6 b of the rear housing 6.

  In the present embodiment, the first and second outer peripheral portions 6a and 6b are described by being divided into two parts for convenience, but they are in the same plane. However, the second outer peripheral portion 6 b of the rear housing 6 may be recessed to the rear side of the rear housing 6 with respect to the first outer peripheral portion 6 a.

  The rear housing 6 is also formed with the fluid discharge chamber 13 in the center between the end plate 2a. In addition, a surrounding chamber 14 communicating with the discharge chamber 13 is formed around the discharge chamber 13. A discharge hole 15 to the discharge chamber 13 is opened at the center of the end plate 2 a, and a one-way valve 16 is attached to the discharge hole 15. The outer wall of the rear housing 6 is provided with a discharge port 17 for discharging the fluid having passed through the discharge chamber 13 and the surrounding chamber 14 to the outside.

  In the present embodiment, the front housing 7 has a structure in which the drive mechanism 20 is housed inside and the inverter 30 assembled on the front side thereof is housed, and the front side is closed by the inverter cover 8. In addition, a suction chamber (not shown) for the fluid is formed in the front housing 7. A suction port (not shown) for the fluid from the outside to the suction chamber is provided on the outer wall of the front housing 7 on the side where the inverter 30 is assembled, and the fluid of the inverter 30 is dissipated by the fluid.

  Inside the center housing 5 and the front housing 7, extending in a direction parallel to the central axis, from the suction chamber on the front housing 7 side to the vicinity of the outer end portions of both spiral wraps 2b and 3b on the center housing 5 side, A fluid passage space 18 for guiding the fluid is formed.

  The fluid is introduced from the suction port provided in the front housing 7 into the suction chamber in the front housing 7 and passes through the fluid passage space 18 of the front housing 7 and the center housing 5 to the outer ends of the spiral wraps 2b and 3b. It is taken in from the part side into the aforementioned fluid pocket 4 and subjected to compression. The compressed fluid is discharged from the discharge hole 15 formed in the center of the end plate 2a of the fixed scroll member 2 to the discharge chamber 13 in the rear housing 6, and from there through the surrounding chamber 14 and the discharge port 17 It is derived to the outside.

  In the scroll compressor 1 configured as described above, as shown in FIG. 2, between the first end 5 a of the center housing 5 and the first outer peripheral portion 6 a of the rear housing 6, and the rear housing 6 An integrated gasket 50 made of the same plate material is interposed between the second outer peripheral portion 6 b and the end plate 2 a of the fixed scroll member 2. That is, the gasket 50 prevents the fluid from leaking and compares the region between the outside and the inside of the housing 40 (between atmospheric pressure and low pressure) and the distance between the fluid from the suction chamber to the discharge chamber 13. The sealability of the region where the differential pressure is large (between discharge and suction) is improved.

The gasket 50 will be described in more detail with reference to FIGS.
3 is a cross-sectional view taken along the line AA in FIG. 1, FIG. 4 is a cross-sectional view taken along the line BB in FIG. 3, and FIG. 5 is a schematic view illustrating the shape of the gasket before being interposed at the joint between the housings. .

  As shown in FIG. 3, the gasket 50 is formed in an annular shape, and a first gasket portion 51 provided on the outer peripheral portion thereof, and a second gasket portion provided on the inner peripheral side of the first gasket portion 51. And 52 are integrated. That is, the gasket 50 is generally formed by punching and appropriately beading a metal plate coated with a rubber layer as a plate, but the first and second gasket portions 51 and 52 are made of the same plate It is done.

The first gasket portion 51 is interposed between the first end 5 a of the center housing 5 and the first outer peripheral portion 6 a of the rear housing 6, and is provided outside at the fastening portion of the bolt 9. The bolt insertion hole 53 is formed here.
The second gasket portion 52 is interposed between the second outer peripheral portion 6 b of the rear housing 6 and the end plate 2 a of the fixed scroll member 2, and has a central axis at the fastening portion of the bolt 9. Extends inward toward the
That is, as shown in FIG. 4, in the gasket 50, the first gasket portion 51 and the second gasket portion 52 are connected along the entire circumference, and the fixed scroll member 2 is formed from the first end 5 a of the center housing 5. Is disposed across the end plate 2a.

  Further, the bead formed on the gasket 50 will be described. As shown in FIG. 5, the first gasket portion 51 is formed with a full bead FB having two bent portions in a folded manner, and the second gasket portion 52 has a half bead HB having one bent portion. Is formed. In general, the full bead FB has a larger spring constant than the half bead HB. That is, beads having different spring constants are formed in the first and second gasket portions 51 and 52, and the spring constant of the first gasket portion 51 is made larger than the spring constant of the second gasket portion 52.

  By so doing, when the center housing 5 and the rear housing 6 are fastened, the bead of the first gasket portion 51 is crushed and sealing performance is secured. At this time, the bead of the second gasket portion 52 is reliably crushed, and sufficient sealing performance is ensured. The height of the half bead HB of the second gasket portion 52 may be set higher than the height of the full bead FB of the first gasket portion 51.

  By the way, generally, when fastening housings, the tolerance from the dimension value of a gasket may affect the sealability with the inside and the exterior of a housing. Hereinafter, with reference to FIG. 6, in the case where the gasket having only the first gasket portion 51 is interposed only in the joint portion between the housings 5 and 6, and in the case where the gasket 50 of the present embodiment is used, The influence of the tolerance from the thickness of the gasket on the sealability will be described.

  As shown in FIGS. 6A to 6C, the height from the second end 5b of the center housing 5 to the first end 5a (the height of the step portion), the fixed scroll member 2 The dimensions of the thickness of the end plate 2a, the thickness of the gasket 50, and the height of the full bead (excluding the thickness of the gasket) formed on the first gasket portion 51 of the gasket 50 are a, b and c, respectively. , And d, and the tolerances from these dimensional values are ± α, ± β, ± γ, and ± δ, respectively.

  Here, in the present embodiment, when the second outer peripheral portion 6b of the rear housing 6 and the end plate 2a of the fixed scroll member 2 are brought into contact with each other without the gasket 50, the first of the center housing 5 A gap is formed between the end portion 5 a and the first outer peripheral portion 6 a of the rear housing 6. That is, the thickness b of the end plate 2a is larger than the height a of the step portion.

  When a gasket having only the first gasket portion 51 is interposed only between the center housing 5 and the rear housing 6 as shown in FIG. 6 (B) (pattern (i) shown in FIG. 6 (A) ), The crushing amount P of the beads crushed by the rear housing 6 is {(a + c + d) −b} ± (α + β + γ + δ). Therefore, in the pattern (i), since the influence of the tolerances α, β, γ, δ is exerted, the stable crush amount P of the gasket can not be obtained, the sealability is impaired and the fixed scroll member 2 is stabilized. It can not be held.

  On the other hand, as shown in FIG. 6C, when the gasket 50 of this embodiment is used (pattern (ii) shown in FIG. 6A), the gasket 50 is formed in the center housing 5 as described above. The first end 5a of the fixed scroll member 2 is disposed across the end plate 2a. Here, the half beads HB formed in the second gasket portion 52 are crushed by the second outer peripheral portion 6b of the rear housing 6 by fastening the housings 5 and 6 to each other at the outer peripheral portion with the bolt 9 (total crushing State). That is, the half beads HB of the second gasket portion 52 are all crushed except for the thickness c.

  On the other hand, there is a gap larger than the thickness of the gasket 50 between the first end 5a of the center housing 5 and the first outer peripheral portion 6a of the rear housing, but the axial force of the bolt 9 with the end plate 2a as a fulcrum Since the full bead FB formed in the first gasket portion 51 is pressed against the first end 5a of the center housing 5 by the moment generated by the above, the gasket 50 is crushed and a sufficient sealing pressure is secured. That is, the gap formed between the first end portion 5a and the first outer peripheral portion 6a is sealed in a state in which the gasket 50 (first gasket portion 51) is interposed by fastening with the bolt 9 (Sealed).

  Therefore, in the present embodiment (pattern (ii)), the amount of crushing P of the full bead FB formed in the first gasket portion 51 is {(( Since a + d)-b} ± (α + β + δ), the sealability at the joint between the housings 5 and 6 is improved and the fixed scroll member 2 is stabilized without considering the tolerance γ of the thickness c of the gasket. Can be held.

Hereinafter, the effect of this embodiment is demonstrated.
According to the present embodiment, the joint between the first end 5 a of the center housing 5 and the first outer peripheral portion 6 a of the rear housing 6, and the second outer peripheral portion 6 b of the rear housing 6 and the fixed scroll member 2. The gasket 50 is used to seal the joint with the end plate 2a. Here, in the present embodiment, the full bead FB is formed in the first gasket portion 51 provided on the outer peripheral portion of the gasket 50, and the second gasket portion provided on the inner peripheral side of the first gasket portion 51. A half bead HB is formed at 52. As described above, since the gasket 50 is disposed straddling from the first end 5 a of the center housing 5 to the end plate 2 a of the fixed scroll member 2, the first end 5 a and the first outer peripheral portion The tolerance from the thickness of the gasket is offset as compared with the case where the gasket having only the first gasket portion is formed only at the joint portion with 6a, and the atmospheric pressure is suppressed while suppressing the fluid permeation leak. -It is possible to improve the sealing performance between the low pressure and between the discharge and the suction, and to stably hold the fixed scroll member 2.

  Further, in the present embodiment, the thickness b of the end plate 2a of the fixed scroll member 2 is set larger than the height a of the step portion. Thereby, at the time of fastening the housings 5 and 6 to each other, the fastening force of the bolt 9 from the upper side of the rear housing 6 is used between the second outer peripheral portion 6 b and the end plate 2 a of the fixed scroll member 2. While the gasket portion 52 (half bead HB) is crushed to secure a sufficient sealing pressure, in the gap formed between the first end 5a and the first outer peripheral portion 6a, the bolt is used with the end plate 2a as a fulcrum Since the first gasket portion 51 (full bead FB) is pressed against the first end 5a of the center housing 5 by the moment generated by the axial force of 9, the first gasket portion 51 is crushed to have a sufficient sealing pressure. It can be secured.

  The illustrated embodiments are merely examples of the present invention, and the present invention is not limited to those directly described by the described embodiments, and various improvements and modifications made by those skilled in the art within the scope of the claims. It goes without saying that it is intended to cover changes.

1 scroll type compressor 2 fixed scroll member 2a end plate 2b spiral wrap 3 movable scroll member 3a end plate 3b spiral wrap 4 fluid pocket (sealed space)
5 Center housing (first housing)
5a first end 5b second end 6 rear housing (second housing)
6a first outer peripheral portion 6b second outer peripheral portion 7 front housing (third housing)
Reference Signs List 8 inverter cover 9 bolt 10 compression mechanism 11 thrust plate 12 thrust receiving portion 13 discharge chamber 14 surrounding chamber 15 discharge hole 16 one-way valve 17 discharge port 18 fluid passage space 20 drive mechanism 21 electric motor 22 drive shaft 30 inverter 40 housing 50 gasket 51 first gasket portion 52 second gasket portion 53 bolt insertion hole

Claims (4)

Fixed scroll members,
A movable scroll member that revolves in contact with the fixed scroll member and forms a sealed space that changes in volume with the revolution between the fixed scroll and the fixed scroll;
The fixed scroll member and the movable scroll member are accommodated, the thrust force of the movable scroll member is received at the end surface of the inner peripheral portion, the outer end portion has a first end portion and an inner peripheral portion than the first end portion. A first housing formed in a side position lower than the first end and having a second end abutting the end plate of the fixed scroll member;
A first outer peripheral portion joined to the first end and an end plate of the fixed scroll member, the outer peripheral portion being joined to the end plate of the fixed scroll member and holding the end plate of the fixed scroll member together with the second end And a second housing having two outer peripheral portions, the scroll compressor comprising:
A first gasket portion interposed between the first end portion and the first outer peripheral portion; and an end plate of the fixed scroll member provided on the inner peripheral side of the first gasket portion And a second gasket portion interposed between the second outer peripheral portion and the second outer peripheral portion, and further comprising an annularly formed gasket integrally formed.   When the second outer peripheral portion is brought into contact with the end plate of the fixed scroll member without the gasket, a gap is formed between the first end and the first outer peripheral portion. The scroll compressor according to claim 1, characterized in that:   The scroll according to claim 2, wherein the gap is sealed in a state in which the gasket is interposed by fastening the first housing and the second housing by fastening means. Mold compressor.   The scroll according to any one of claims 1 to 3, wherein a full bead is formed in the first gasket portion, and a half bead is formed in the second gasket portion. Mold compressor.