JP2858903B2 - Scroll compressor - Google Patents

Description

The present invention relates to a scroll compressor that performs compression by rotating both scrolls in the same direction.

(B) Conventional technology A conventional scroll compressor is configured such that a fixed scroll is fixed in an airtight container, and the orbiting scroll is orbited around the center of the fixed scroll.

However, in the conventional one, the driving shaft of the orbiting scroll has a cantilever structure, so that the one for high-speed rotation increases vibration. Further, in the case of a large-size one, the centrifugal force of the orbiting scroll becomes extremely large, and the load acting on the bearing provided on the back of the orbiting scroll increases, which may lead to a decrease in efficiency and a decrease in reliability.

On the other hand, as a scroll compressor for high-speed rotation,
Japanese Patent Application Laid-Open No. 57-49721 discloses a type in which both scrolls are rotated and one scroll is turned with respect to the other scroll.

(C) Problems to be solved by the invention However, this type has the following problems. That is, since the orbiting scroll is caused to swing with respect to the drive shaft, the orbiting scroll may vibrate violently during high-speed rotation, which has not always been satisfactory as a scroll compressor for high-speed rotation.
In addition, this scroll compressor rotates both scrolls in the same direction with a coupling ring and a projection provided on the outer peripheral end of a wrap fitted into the yard of the ring, and also forms a compression space formed by the wrap of both scrolls. The structure is complicated because it is swung so as to be gradually reduced and compressed from the outside to the inside, and the high and low pressure is sealed by the rotating part, so the reliability of this seal part decreases, There was a problem that the refrigeration capacity was reduced.

SUMMARY OF THE INVENTION The present invention solves the above-described problem. A sliding member is housed in a pressure chamber formed between a regulating member and a scroll, and the sliding member is formed of a material having excellent wear resistance. It is an object of the present invention to provide a scroll compressor in which a refrigerant pressure for pressing a scroll in an axial direction does not leak to a low pressure side while improving abrasion resistance of a moving surface.

(D) Means for Solving the Problems The present invention accommodates an electric element and a scroll compression element in a closed container, and the scroll compression element is directly or directly attached to the electric element by erecting a spiral wrap on a head plate. A first scroll having an indirectly connected axis, and a spiral wrap on a head plate having an axis eccentric to the center of the axis of the first scroll and meshing opposite to the first scroll. An upright second scroll, a main frame having a main bearing for supporting the axis of the first scroll, an auxiliary frame having an auxiliary bearing for supporting the axis of the second scroll, The first and second scrolls include a restricting member attached to one of the scrolls so as to restrict the movement of the other scroll in the axial direction. The scroll is compressed by the restricting member. In a scroll compressor in which a pressure chamber communicating with a compression space in the middle is provided, and the pressure chamber is provided on a surface facing the regulating member of the scroll, a sliding member having excellent wear resistance is provided in the pressure chamber. The sliding member is pressed toward the regulating member.

Further, in the present invention, a sliding member is provided with a sealing material.

(E) Action With the present invention configured as described above, the sliding member is disposed in the pressure chamber between the regulating member and the scroll,
The sealing property is improved while reducing the wear between the sliding member and the regulating member that swings.

(F) Embodiment Hereinafter, the present invention will be described with reference to the embodiment shown in FIGS.

1 is a closed container, in which a motorized element 2
However, the scroll compression elements 3 are respectively housed on the upper side. The electric element 2 includes a stator 4 and a rotor 5 arranged inside the stator. 6 is the main frame,
This frame is provided with a main bearing 7 at the center. 8
Is an auxiliary frame, which includes a main frame 6
The main bearing 7 and the eccentric auxiliary bearing 9 are provided. A cylindrical frame 11 is sandwiched between the main frame 6 and the auxiliary frame 8 so as to form a space 10 therein.

The scroll compression element 3 includes a first scroll 12 driven by the electric element 2 and a second scroll 13 that rotates in the same direction as the first scroll. The first scroll 12 has a disk-shaped end plate 14, a spiral wrap 15 formed of an involute-shaped curve erected on one surface of the end plate, and a center of the other surface of the end plate 14. The drive shaft 16 is inserted and fixed to the rotor 5. The first scroll 12 constitutes a driving scroll. The second scroll 13 has a disk-shaped end plate 17, a spiral wrap 18 formed of an involute-shaped curve erected on one surface of the end plate, and protrudes from the center of the other surface of the end plate 17. And a driven shaft 19. The second scroll 13 constitutes a driven scroll.

The first and second scrolls 12 and 13 wrap the laps 15 and 18 in the space 10
A plurality of compression spaces 20 are formed inside each other so as to face each other and engage with each other.

Reference numeral 21 denotes a regulating member that regulates the axial movement of the second scroll 13. The regulating member is formed in a flat ring shape and contacts the end plate 17 of the second scroll 13 so as to contact the first scroll 13.
A similar locking ring 24 is attached to a cylindrical member 23 fixed to the outer periphery of the 12 end plates 14 by a locking ring 22.

An annular pressure chamber 25 is provided on the end plate 17 of the second scroll 13 on the contact surface side with the regulating member 21. A sliding member 26 having excellent wear resistance is fitted into the pressure chamber.
An annular sealing material is provided on the inner and outer peripheral sides of the sliding member, respectively.
27 and 28 are provided. The inside of the pressure chamber 25 communicates with the compression space 20 in the middle of compression through a small hole 29 provided in the end plate 17 of the second scroll 13. This small hole is provided below the sliding member 26.

Reference numeral 30 denotes a transmission coupling, which is a first coupling 12
Is transmitted to the second scroll 13 and the scrolls 12, 13 are relatively swung.

The inside of the sealed container 1 is divided into a low-pressure chamber 31 and a high-pressure chamber 32 by the main frame 6 and the cylindrical frame 11. The space 10 communicates with the low-pressure chamber 31 through a hole 33 provided in the main frame 8. The main frame 6 is provided with a pipe 34 for allowing oil accumulated at the bottom of the space 10 to escape to the low-pressure chamber 32.

The refrigerant compressed in the compression space 20 is supplied to the driven shaft 19 in the high-pressure chamber.
An ejection hole 35 communicating with 32 is provided.

The space 10 and the high-pressure chamber 32 are sealed by a seal member 36 provided on a sliding surface between the auxiliary bearing 8 of the auxiliary frame 8 and the driven shaft 19.

Reference numeral 37 denotes a suction pipe, which communicates with the low-pressure chamber 31. Reference numeral 38 denotes a discharge pipe, which communicates with the high-pressure chamber 32.

In the scroll compressor configured as described above, when the electric element 2 is rotated, the rotational force is transmitted to the first scroll 12 via the drive shaft 16. The rotational force transmitted to the first scroll is transmitted to the second scroll 13 via the transmission joint 30, and the second scroll 13 is held in a state where the second scroll is held between the regulating member 21 and the first scroll 12. 1
Rotate in the same direction as the scroll. The second scroll 13 rotates with the center of the driven shaft 19 eccentric with respect to the center of the drive shaft 16 of the first scroll 12. First
The second scroll 13 and the second scroll 13 gradually reduce the compression space 20 formed by these scrolls from the outside toward the inside, so that the refrigerant flowing from the suction pipe 37 into the low-pressure chamber 31 is supplied to the main frame 6. The air is guided into the space 10 through the hole 33 and flows into the outer compression space 20 to be compressed. The compressed refrigerant is discharged into the high-pressure chamber 32 through a discharge hole 35 provided in the driven shaft 19 of the second scroll 13, and discharged from the discharge pipe 38 to the outside of the closed container 1. The medium-pressure refrigerant in the course of compression is discharged from the small holes 29 into the pressure chamber 25 to act as a back pressure of the second scroll 13.

The regulating member 21 is attached to a cylindrical member 23 fixed to the outer periphery of the end plate 14 of the first scroll 12 by a retaining ring 22 with a similar retaining ring 24 to restrict the axial movement of the second scroll 13. Thereby, the clearance at the tips of the wraps 15 and 18 of the first and second scrolls 12 and 13 is limited to a certain value or less, so that the refrigerating capacity is not reduced even at the time of starting with a small axial pressing force, First scroll 12 by 23
Of the scroll compressor so as not to increase the radial outer dimensions of the scroll compressor.

The sliding member 26 housed in the pressure chamber 25 is pressed by the refrigerant flowing into the pressure chamber 25 through the small hole 29 from the compression space 20 in the middle of compression toward the regulating member 21, thereby forming the second scroll. 13 is pressed in the axial direction of the first scroll 12, and the wear of the annular seal members 27, 28 in the pressure chamber 25 can be prevented even when the second scroll 13 swings with respect to the regulating member 21. I have to. Further, the sliding member 26 seals the pressure chamber 25 with annular sealing members 27 and 28 provided on the inner peripheral side and the outer peripheral side end, so that the refrigerant discharged into the pressure chamber from the small hole 29 is filled in the space 10. To prevent leaks inside.

In the above description, the sliding members 26 provided with the annular sealing members 27 and 28 on the inner peripheral side and the outer peripheral side are housed in the pressure chamber 25, but as shown in FIG. A sliding member 39 having a T-shaped cross section is housed in the pressure chamber 25, and annular sealing members 40 and 41 having a reverse U-shaped cross section are provided on both sides of the sliding member to improve the wear resistance of the sliding portion. The sealing performance may be ensured while maintaining the pressure, or a ring plate may be provided above the pressure chamber 25 as shown in FIG.
It is needless to say that the same effect can be obtained by arranging 42 and arranging annular sealing members 43 and 44 having a U-shaped cross section on the inner peripheral side and the outer peripheral side in the pressure chamber 25 below the ring plate. No.

(G) Effects of the Invention As described above, according to the present invention, the sliding member having excellent wear resistance is provided in the pressure chamber, and the sliding member is pressed toward the regulating member. Between the pressure chamber and the sliding surface,
The wear of the sealing material in the pressure chamber can be prevented. In addition, since a sliding member having excellent wear resistance is provided on the sliding surface between the scroll and the regulating member, wear on the sliding surface can be prevented.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor showing one embodiment of the present invention, FIG. 2 is an enlarged sectional view of a main part of the scroll compressor, and FIG. FIG. 4 is an enlarged cross-sectional view of a main part corresponding to FIG. 3 showing another embodiment, and FIG. 5 is an enlarged cross-sectional view of a main part corresponding to FIG. 3 showing another embodiment. It is a principal part expanded sectional view. DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Electric element, 3 ... Scroll compression element, 6 ... Main frame, 7 ... Main bearing, 8 ... Auxiliary frame, 9 ... Auxiliary bearing, 12 ... First scroll ,
13 ... second scroll, 14,17 ... end plate, 15,18 ... lap, 16 ... drive shaft, 19 ... driven shaft, 21 ... regulating member,
25 ... Pressure chamber, 26,39,42 ... Sliding member, 27,28,40,41,4
3,44 …… Seal material.

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Senio Ishigo, 2-18-18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor: Denji Machishita 2-chome, Keihanhondori, Moriguchi-shi, Osaka 18 Sanyo Electric Co., Ltd. (56) References JP-A-62-60901 (JP, A) JP-A-58-110885 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) F04C 18/02 311

Claims (3)

(57) [Claims] An electric element and a scroll compression element are housed in an airtight container, and the scroll compression element is provided with a shaft which is directly or indirectly connected to the electric element by forming a spiral wrap on a head plate. A second scroll having a first scroll having an axis eccentric to the center of the axis of the first scroll, and having a spiral wrap erected on a mirror plate facing and engaging with the first scroll. A main frame having a main bearing for supporting the shaft of the first scroll; an auxiliary frame having an auxiliary bearing for supporting the shaft of the second scroll; And a regulating member attached to one of the scrolls so as to regulate the movement of the other scroll in the axial direction, and a pressure communicating with the compression space in the middle of compression of the scroll regulated by the regulating member. In a scroll compressor in which the pressure chamber is provided on a surface of the scroll facing the regulating member, a sliding member having excellent wear resistance is provided in the pressure chamber, and the sliding member is pressed toward the regulating member. A scroll compressor characterized by: 2. The scroll compressor according to claim 1, wherein said sliding member is formed in a ring shape. 3. The scroll compressor according to claim 1, wherein a sealing material is provided on said sliding member.