JPH06264875A - Scroll compressor - Google Patents

Abstract

PURPOSE:To suppress the seizure and gall on the sliding surfaces between the rotary thrust support face, fixed side thrust support face of substrates and an abrasion-resistant race and improve durability during the turning motion of a moving scroll member. CONSTITUTION:Both scroll sections 2b, 8b of a fixed scroll member 2 provided with the scroll section 2b on the surface of a substrate 2a and a moving scroll member 8 provided with the scroll section 8b on the surface of a substrate 8a are arranged at a staggered angle so that side walls of both scroll sections 2b, 8b are brought into contact with each other. An abrasion-resistant race 17 is provided rotatably along a fixed thrust support face 2e between a rotary thrust support face 8e formed toward the outer periphery of the substrate 8a of the moving scroll member 8 and the fixed thrust support face 2e provided on a housing 2c storing the fixed scroll member 2. The abrasion-resistant race 17 is rotated by the substrate 8a during the turning motion of the moving scroll member 8, and the friction resistance of sliding surfaces is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the revolution of a movable scroll member between a spiral portion of a fixed scroll member and a spiral portion of a movable scroll member facing the spiral portion so as to be non-rotatable and revolvable. The present invention relates to a scroll compressor that forms a compression chamber whose volume is reduced based on the above.

[0002]

2. Description of the Related Art In a scroll type compressor, a fixed scroll member having a spiral portion on the surface of a substrate and a scroll member of a movable scroll member having a spiral portion on the surface of the substrate are offset from each other. Moreover, it is arranged so that the side walls of both spiral parts are in contact with each other. Further, the movable scroll member is revolved on a circular orbit to take the refrigerant gas in the suction chamber formed on the outer side of both spiral portions into the sealed compression chamber, and the compression chamber is centered from the outer end portion of the spiral portion. By moving the compressed gas into the discharge chamber, the volume of the compression chamber is reduced, and the compressed gas is discharged into the discharge chamber from a discharge hole formed in the central portion of the substrate of the fixed scroll member. Further, a wear resistant member is fitted and fixed to a supporting surface formed in a housing for accommodating the fixed scroll member, and the wear resistant member is thrust from a thrust receiving surface near the outer periphery of the substrate front surface of the movable scroll member. When a load is applied, wear of the sliding surface is suppressed. (Japanese Patent Laid-Open No. 61-38187)

[0003]

In the conventional scroll compressor described above, the orbiting motion of the orbiting scroll member is swung while the rotation thereof is blocked. At this time, since the abrasion resistant member is fixed to the housing, when an excessive thrust load acts on the sliding surface between the abrasion resistant member and the substrate,
There is a problem that the sliding surface is seized or biting occurs, resulting in a decrease in durability.

Further, the end faces of both spiral portions of the fixed and movable scroll members are assembled and arranged with the substrates facing each other with a minute clearance, and the seal member is housed in the seal groove formed in the end faces. This clearance differs for each compressor due to variations in the processing precision of both scroll members. However, even if an attempt is made to properly adjust the clearance by changing the thickness of the wear resistant member, the wear resistant member is fixed to the housing in advance, so that there is a problem that the clearance cannot be adjusted.

The present invention solves the above problems of the prior art by seizing the orbiting thrust receiving surface near the outer periphery of the front surface of the movable scroll member and the sliding surface of the fixed thrust receiving surface provided in the housing that houses the fixed scroll member. An object of the present invention is to provide a scroll-type compressor that can suppress biting and improve durability and can easily adjust the clearance between the end surface of the spiral portion and the substrate.

[0006]

To achieve the above object, the present invention provides both scrolls of a fixed scroll member having a spiral portion on the surface of a substrate and a movable scroll member similarly having a spiral portion on the surface of the substrate. The parts are arranged so that their angles are offset from each other and the side walls of both spiral parts are in contact with each other, and the movable scroll member is revolved on a circular orbit in a state in which it is prevented from rotating, thereby forming a seal between both spiral parts. A scroll type compressor for reducing and changing the volume of the compression chamber by moving the compressed compression chamber from the outside of the spiral portion to a central portion, in which the orbiting thrust receiving surface near the outer periphery of the substrate front surface of the movable scroll member and the fixed scroll A wear-resistant race that receives a thrust load is provided between the fixed thrust receiving surface and the fixed thrust receiving surface provided on the housing that accommodates the member. What did you do to be able to intervention.

[0007]

In the present invention, the front surface of the base plate acts as a thrust load on the abrasion resistant race during the orbiting motion of the movable scroll member. At this time, since the abrasion resistant race is rotatably supported on the fixed thrust receiving surface or the swing thrust receiving surface on the housing side, the abrasion resistant race rotates when an excessive thrust load is applied. To do. For this reason, the maximum sliding speed between the sliding surfaces of the thrust receiving surface before and after the abrasion resistant race, and the orbiting thrust receiving surface and the fixed thrust receiving surface is reduced as compared with the case where the race is fixed. As a result, the frictional resistance between the two sliding surfaces is reduced, and seizure and biting on the two sliding surfaces are prevented.

Further, according to the present invention, since the abrasion resistant race can be replaced with one having a different thickness in the assembling process of the compressor, the clearance between the end faces of both spiral parts and the opposing substrate is exclusively adjusted. It can be easily done without the use of spacers.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 2, the fixed scroll member 2 is joined and fixed to the right end surface of the housing 1. The fixed scroll member 2 includes a plate-shaped substrate 2a,
A spiral portion 2b integrally formed on the inner wall surface of the substrate 2a,
Housing 2c integrally formed on the outer peripheral portion of the substrate 2a
It is composed of and.

A stator 3 is fitted and fixed at a predetermined position near the inner periphery of the housing 1. At the center of the housing 1, a rotary shaft 4 and a rotor 5 are rotatably supported by bearings. An eccentric shaft 6 is connected to the right end of the rotary shaft 4, and a bush 7 is fitted to the eccentric shaft 6 so as to be relatively rotatable. On the outer peripheral surface of the bush 7, a cylindrical boss portion 8c formed on the rear surface of the base plate 8a of the movable scroll member 8 is fitted and supported via a bearing 9 so as to be relatively rotatable. Substrate 8a of the movable scroll member 8
A spiral portion 8b is formed on the front surface of the. As shown in FIGS. 2 and 3, the compression chamber P is formed by the substrates 2a and 8a and the spiral portions 2b and 8b of both scroll members 2 and 8.

A known rotation preventing mechanism 10 is interposed between the right end surface 1a of the housing 1 and the rear surface of the movable scroll member 8 near the outer periphery of the base plate 8a. (See, for example, Japanese Patent Application Laid-Open No. 2-308990) This rotation prevention mechanism 10 can prevent the movable scroll member 8 from rotating, allow revolution, and support the thrust load during compression operation by the right end surface 1a.

A balance weight 11 is supported on the eccentric shaft 6 to smoothly orbit the movable scroll member 8. A suction chamber 12 is formed on the outer end side of both the spiral portions 2b and 8b, and the suction chamber 12 passes through a suction port 2d formed in the housing 2c of the fixed scroll member 2 and is an external suction refrigerant pipe of a cooling device. It is in communication with the road.
Further, the discharge hole 8 is provided at the center of the movable scroll substrate 8a.
d is formed, and the compression chamber P and the discharge chamber 13 formed inside the boss portion 8c can communicate with each other. Reference numeral 14 is a discharge valve for opening and closing the discharge hole 8d. The discharge chamber 13 is communicated with a crank chamber 15 formed outside the boss portion 8c by a communication hole 7a formed in the bush 7. The crank chamber 15 is communicated with a storage chamber 16 of the rotor 5 through a communication hole 1b formed inside the housing 1, and the storage chamber 16
Is communicated with the external discharge refrigerant pipe line through a discharge port 1c formed in the housing 1.

Therefore, the rotating shaft 4 and the rotor 5 are rotated by energizing the coil of the stator 3, and the eccentric shaft 6 is rotated.
When the orbit is revolved, the movable scroll member 8 revolves around the central axis of the rotating shaft 4. Therefore, the refrigerant gas in the suction chamber 12 is taken into the compression chamber P between the scroll members 2 and 8. In FIG. 3, the compression chamber P decreases in volume as the movable scroll member 8 revolves, and both the spiral portions 2b and 8b are reduced.
Converge towards the center of. The refrigerant gas compressed by the reduction of the volume of the compression chamber P pushes the discharge valve 14 from the discharge hole 8d of the scroll substrate 8a shown in FIG.
3 is discharged into the inside. The refrigerant gas discharged into the discharge chamber 13 is pressure-fed to the crank chamber 15 through the communication hole 7a, and the refrigerant gas in the crank chamber 15 is transferred through the communication hole 1b to the accommodation chamber 1
6, and is discharged to the outside from the discharge port 1c.

Next, the support structure of the abrasion resistant race, which is the main part of the present invention, will be described. In FIG. 2, the housing 2c of the fixed scroll member 2 is formed with a fixed thrust receiving surface 2e that receives a load in the thrust (right) direction that acts on the movable scroll member 8 during a compression operation. A donut plate-shaped first portion is formed between the fixed thrust receiving surface 2e and the swirl thrust receiving surface 8e near the outer periphery of the front surface of the substrate 8a.
An abrasion resistant race 17 having a thrust receiving surface 17a and a second thrust receiving surface 17b is interposed. This race 1
The outer peripheral edge of 7 is regulated by the inner peripheral surface 2f of the housing 2c, and the race 17 is rotatable at a predetermined position while being guided by the fixed thrust receiving surface 2e and the inner peripheral surface 2f.

When the orbiting movement of the movable scroll member 8 causes a compression operation, the discharge pressure in the crank chamber 15 acts as a thrust load in the right direction on the back surface of the base plate 8a shown in FIG. Further, since the pressure of the compression chamber P also becomes the discharge pressure at the central portion, a left thrust load acts on the front surface of the substrate 8a. However, since the intermediate pressure and the suction pressure are applied to the intermediate portion and the outside of the substrate 8a, the right thrust load acts on the substrate 8a as a whole. Due to this load, the swivel thrust receiving surface 8e on the front surface of the substrate 8a is pressed against the first thrust receiving surface 17a of the abrasion resistant race 17 and swivels, so that the race 17 receives rotational force in the swiveling direction. That is, when, for example, a certain point on the substrate 8a in FIG. 3 turns clockwise on the revolution orbit indicated by Q, the race 1
7 receives a turning force in a clockwise direction as shown by an R arrow in the figure. This action occurs on the entire contact surface between the orbiting thrust receiving surface 8e of the base plate 8a and the first thrust receiving surface 17a of the race 17. Therefore, the abrasion resistant race 17 is rotated at a predetermined position while being guided by the fixed thrust receiving surface 2e and the inner peripheral surface 2f. Then, the maximum sliding speed on the sliding surface between the turning thrust receiving surface 8e of the base plate 8a and the first thrust receiving surface 17a of the race 17 is reduced, and the frictional resistance is reduced. As a result, seizure and biting on the sliding surface between the abrasion resistant race 17 and the substrate 8a are prevented.

Further, sliding also occurs on the sliding surface between the second thrust receiving surface 17b of the wear resistant race 17 and the fixed thrust receiving surface 2e on the side of the housing 2c, but the speed thereof is at the wear resistant race. Since 17 has a relatively low rotation speed, seizure or biting does not occur on this sliding surface.

By the way, the thickness t of the abrasion resistant race 17 is set as follows. That is, as shown in FIG. 1, the thickness t is selected so that the end faces of the scroll portions 2b, 8b of the scroll members 2, 8 have a minute clearance C between the opposing substrates 8a, 2a. There are two reasons for providing this clearance C. One of them is to form a seal groove on the end faces of the spiral portions 2b and 8b, and to fit a seal member 18 in the seal groove to enhance the sealing force between the compression chambers P. The other is that a wear-resistant race 17 can be pressure-bonded and held between the swirl thrust receiving surface 8e and the fixed thrust receiving surface 2e on the front surface of the base plate 8a, and the race 17 can be moved from the crank chamber 15 containing a high pressure compressed gas to the race 17. This is to prevent gas from leaking into the suction chamber 12 through the slits in the front and rear sliding surfaces.

Further, the spiral portion 8 of the movable scroll member 8
The height h1 of b and the height h2 of the fixed scroll member 2 from the base plate 2a to the fixed thrust receiving surface 2e vary in the manufacturing process of both members. Therefore, when the thickness t of the race 17 is the same, the clearance C varies. However, in the above-described embodiment, the wear resistant race 17 is attached to the housing 2
Since it is not fixed to c, the clearance C can be easily adjusted only by changing the thickness t of the race 17 at the time of assembling the compressor without using a dedicated spacer.

The present invention is not limited to the above embodiment, but can be embodied as follows. (1) The abrasion resistant race 17 is rotatably supported on the base plate 8a side of the movable scroll member 8. Also, wear resistant races 17 should be provided on both scroll members 2 and 8, respectively.

(2) Although not shown, a scroll type compressor in which the fixed scroll member 2 and the housing 2c are formed separately is used.

[0021]

As described in detail above, according to the present invention, seizure of the sliding thrust receiving surface of the base plate of the movable scroll member and the sliding surface between the fixed thrust receiving surface and the abrasion resistant race is performed. This has an excellent effect that it is possible to suppress dents and dents and improve durability, and it is possible to easily adjust the clearance between the end face of the spiral portion and the substrate.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an enlarged main part of the present invention.

FIG. 2 is a vertical sectional view of a scroll type compressor embodying the present invention.

3 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

2 ... Fixed scroll member, 2a, 8a ... Substrate, 2b, 8
b ... Vortex part, 2c ... Housing, 2e ... Fixed thrust receiving surface, 8 ... Movable scroll member, 8e ... Orbiting thrust receiving surface, 17 ... Wear resistant race, 17a ... First thrust receiving surface, 17b ... Second thrust Receiving surface, P ... Compression chamber.

Front Page Continuation (72) Inventor Atsushi Hasegawa 2-chome, Toyota-cho, Kariya City, Aichi Prefecture Toyota Industries Corp.

Claims (1)

[Claims] 1. A fixed scroll member having a spiral portion provided on the surface of a substrate and a movable scroll member having a spiral portion similarly provided on the surface of the substrate are offset in angle from each other, and side walls of the spiral portions are in contact with each other. The movable scroll member is revolved on a circular orbit in a state where rotation of the movable scroll member is prevented, and the sealed compression chamber formed between both spiral portions is moved from the outside to the center of the spiral portion. In the scroll compressor that reduces and changes the volume of the compression chamber, the orbiting thrust receiving surface closer to the outer periphery of the substrate front surface of the movable scroll member and the fixed thrust receiving surface provided in the housing that houses the fixed scroll member. A scroll compressor in which a wear-resistant race receiving a thrust load is rotatably interposed along the fixed thrust receiving surface or the orbiting thrust receiving surface.