JP2928657B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to interlocking eccentric and spiral wrap portion of the orbiting scroll and the spiral wrap of the fixed scroll, revolving spiral wrap portion of the orbiting scroll The present invention relates to a scroll compressor that reduces a volume while discharging a compressed fluid from a central portion while moving a sealed space formed between both spirally-wrapped wrap portions in a central direction.

[0002]

2. Description of the Related Art A conventional scroll compressor is disclosed in
As described in JP-A-119412 and JP-A-55-37520, the seat surface 31 which is the contact surface between the end plates of the fixed scroll 2 and the orbiting scroll 3 is formed in a ring shape having the same width all around. I have. Therefore, a uniform sealing pressure is always maintained and a stable sealing effect is obtained. In addition, conventional technology
In the description of FIG. 1, parts corresponding to FIG. 1 to FIG.
A description will be given with numbers. Further, the width 34 of the sheet surface 31 which is a ring-shaped sliding surface is formed smaller than the turning diameter, and when the contact surface moves, the original contact surface is completely exposed to the oil atmosphere, and the end plate 35 of the turning scroll is rotated. The top surface is sufficiently wetted with oil. Therefore, when the contact surface returns to the next original position due to the orbiting motion of the orbiting scroll, sufficient refueling becomes possible. Groove 3 provided in fixed scroll 2
3 is formed as an annular groove on the entire circumference, while the orbiting scroll 3 is orbiting, the outer peripheral portion of the end plate 35 enters and exits the annular space 37 formed by the groove 33 and the frame 5. ing.

On the other hand, the oil supplied to the upper main bearing 12 and the thrust bearing 40 from the oil hole 19 and the oil supplied to the slewing bearing 8 flow into the back pressure chamber 16, and eventually fill up and further into the annular space 37. And the upper surface of the end plate 35 of the orbiting scroll 3 is wetted with oil.

[0004]

However, this corresponds to almost half a turn from the end of the spiral of the wrap of the fixed scroll 2.
Machining the outer diameter portion 21 of the part, when the same wall thickness t of the spiral, the dimensions of the outer shallow groove 36 determined by the diameter of the end mill cutting tool for processing, and to reduce its diameter takes processing time, increasing There is a disadvantage that the outer diameter of the fixed scroll 2 is increased. Therefore, the dimensions of the outer diameter 20 of the portion corresponding to approximately half volume from the winding finish end of the wrap of the fixed scroll 2, the center of the fixed scroll 2 or these radii r
Lathe processing is performed to reduce the radial width of the shallow groove 36 to a necessary minimum, thereby reducing the outer diameter of the fixed scroll 2 and improving workability. However, in this shape, it corresponds to almost half a turn from the end of the fixed scroll 2.
The thickness t of the portion to be enlarged becomes larger, the portion becomes larger than the turning diameter, the refueling condition becomes worse, and there is a defect that a galling phenomenon occurs in this portion when it overlaps with severe operating conditions.

That is, gas does not flow from the end of the fixed scroll wrap to a half of the fixed scroll wrap, so that lubrication is not sufficient.
Under severe conditions where both members are strongly pressed in the axial direction, abnormal wear and seizure occurred on the tips of the fixed scroll wrap and the roots of the orbiting scroll, causing a significant decrease in reliability. .

It is an object of the present invention to provide a fixed scroll wrap.
Surely lubricate a portion equivalent to approximately half a turn from the end of
It is possible to perform, TURMERIC line surface pressure reducing this part
Door can be, galling the prevention of the phenomenon of reliability with reference to FIG. Rukoto
It is to provide a high scroll compressor.

[0007]

[MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
A first feature of the present invention is that a spiral wrap is formed on a head plate.
Upright fixed scroll member and orbiting scroll
Engage the wrap of the tool members inside and rotate
Rotary shaft with boss of scroll member supported by frame
And engages with the eccentric shaft connected to the
Fixed scroll part without further rotation to the Oldham mechanism
Orbital motion to the material, around the outer periphery of the fixed scroll member
Gas is sucked in from the provided inlet and both scroll members
Move the enclosed space formed by
Reduces the gas and compresses it, from the outlet provided in the center
The compressed scroll is discharged, and the fixed scroll is
Place a ring-shaped sheet surface at the same height on the outside of the roll
And approximately halfway from the end of the wrap of the fixed scroll.
Outer diameter where the tooth thickness of the part corresponding to the winding is larger than the turning diameter
A shallow groove forming the inside of the ring-shaped sheet surface
In the scroll compressor, the tooth thickness is determined from the orbital diameter in a state where the fixed scroll and the orbiting scroll are combined.
The gap between the tooth tip and the tooth tip formed by the tooth tip portion of the portion corresponding to substantially half a turn from the end of winding of the wrap of the fixed scroll and the tooth bottom portion of the orbiting scroll corresponding thereto becomes large. It is configured to be larger than the gap formed between the tooth tip and the tooth bottom in another area.

[0008] Preferably, the fixed scroll wrap
Of the tooth tip portion, which is almost half a turn from the end
The root of the corresponding orbiting scroll is compared to other roots
It is a deeply structured one. In addition, the fixed scroll
The tip of the wrap is approximately half a turn from the end of the wrap
The tooth bottom of the orbiting scroll corresponding to the minute is the tooth of the other area
It is 15-20 μm deeper than the bottom part.
You. In addition, the end of the fixed scroll wrap
The tooth tip of the part corresponding to almost half a roll is lower than other areas
It is composed. In addition, the fixed scroll
The tooth tip of the part corresponding to almost half a turn from the end of winding
15-20μm lower than the tooth tip in other areas
It was done. A second feature of the present invention is that the end plate is spirally wound.
Fixed scroll member and upright wrap
And the orbiting scroll members wrap inside each other
And support the boss of the orbiting scroll member to the frame.
Engage with the eccentric member connected to the rotating shaft
The crawl member is fixed without rotating by the Oldham mechanism.
Swivel relative to the constant scroll member to fix the scroll
Gas from the suction port provided on the outer periphery of the
Closed space formed by both scroll members toward the center
Move and reduce the volume to compress the gas and install it in the center
Ejecting compressed gas than was the discharge port, said fixed scroll
Of the same height on the outside of the fixed scroll wrap.
Wrapping of the fixed scroll
The tooth thickness of the part corresponding to almost half a turn from the end is the turning diameter.
The shallow groove that forms the outer diameter
A scroll compressor having an inner surface
Latch of the fixed scroll whose tooth thickness is larger than the turning diameter
Of the part corresponding to almost half a turn from the end of the turn
The tooth thickness at the tip that touches the bottom of the scroll
The thickness should be equal to or less than
It has been achieved. Preferably, the orbiting scroll winding
The thickness of the tooth tip at the part corresponding to approximately half a turn from the end
Outside the wrap so that it is thinner than the wrap thickness
Side part lower than other lap parts
It is.

[0009]

In accordance with the according scroll compressor, is formed in the teeth root portion of the orbiting scroll corresponding thereto and <br/> addendum portion of a portion corresponding to approximately half volume from the winding finish end of the wrap of the fixed scroll because the clearance between the tooth tip and the tooth bottom has been greatly set than the gap formed by the tooth tip and tooth bottom of the other areas, and this portion acts as an oil reservoir, thereby wrap wrapped around
Larger than the turning diameter of the part corresponding to almost half a turn from the end
Portion with <br/> which can also perform refueling more securely to the tooth tip made, the surface pressure reducing this portion is figure allows prevention of galling phenomenon. Since the gap section is one in which the pressure difference between the compression chamber is deeply smaller and 15 to 20 [mu] m,
The rate of leakage from this part is small , and the performance degradation is small.

Further, of the portion corresponding to approximately half a turn from the end of winding of the wrap of the fixed scroll , the tooth thickness of the tooth tip portion in contact with the bottom surface of the orbiting scroll is equal to or different from the tooth thickness of the other portions. Because it is configured to have a thickness smaller than that, the part corresponding to almost half a turn from the end of the wrap of the wrap
Contact the tooth crest of the minute of the orbiting scroll bottom, during the movement caused by the turning movement, it is always exposed to the oil contained in the refrigerant gas width,
Ri wet as vegetables in oil, this depending on whether the winding end of the lap
Part that is larger than the turning diameter of the part equivalent to approximately half a turn
The <br/> both and it is possible to perform refueling in minute addendum more reliably, the surface pressure reducing this portion is figure can be performed to prevent the galling phenomenon.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view of a scroll compressor according to the present invention.
It is a longitudinal cross-sectional view common to an Example. FIG.
Plan view of the first embodiment of the constant scroll as viewed from the spiral side,
FIG. 3 shows a first embodiment of the orbiting scroll used in the present invention.
FIG. 3 is a plan view as seen from the winding side.

In the scroll compressor shown in FIG. 1, a compressor unit and an electric motor unit are housed in a sealed container 1. In the compressor section, the fixed scroll 2 and the orbiting scroll 3 are engaged with each other to form a compression chamber 9 (closed space). The fixed scroll 2 is composed of a disk-shaped end plate and a spiral wrap 2a formed by an involute curve standing upright or a curve similar thereto, and a discharge port 10,
A suction port 4 is provided on the outer periphery. The orbiting scroll 3,
A disk-shaped head plate, a spiral wrap 3a standing upright and formed in the same shape as the spiral wrap 2a of the fixed scroll 2, and a boss 2 formed on the side opposite to the lap surface of the head plate
It consists of five. The bearing 2 is located at the center of the frame 5.
6a and 26b are formed , and the rotating shaft 7 is supported on the bearings 26a and 26b . Eccentric shaft 7b at the tip of rotating shaft 7
Is inserted into the boss 25 of the orbiting scroll 3 so as to be capable of orbital movement. The fixed scroll 2 is fixed to the frame 5 by a plurality of bolts. The orbiting scroll 3 is supported on the frame 5 by an Oldham mechanism including an Oldham ring 27, an Oldham key, and the like. It is formed so as to make a turning motion without rotating. An electric motor shaft is integrally connected to the lower part of the rotating shaft 7 and directly connected to an electric motor unit (consisting of a stator 14 and a rotor 15). The suction port 4 of the fixed scroll 2 penetrates the airtight container 1 and is connected thereto.

[0013] Scroll compressor having the above structure is, by the rotation of the rotary shaft 7 is directly connected to the electric motor, by the eccentric shaft 7b is eccentrically rotated, via a boss 25, the orbiting scroll 3
Makes a turning motion. Due to this swirling motion, the compression chamber 9 gradually moves to the center and the volume decreases. The gas enters the compression chamber 9 via the suction port 4 and is compressed as described above to form the discharge port 1.
0 to the discharge chamber 11, and is discharged from a discharge pipe (not shown) connected through the closed container 1.

The operation of the compressor will be described according to the flow of the refrigerant gas and the flow of the lubricating oil. The low-temperature and low-pressure refrigerant gas is guided from the suction port 4 and reaches the outermost chamber 32 of the fixed scroll 2. The refrigerant gas reaching the compression chamber 9 is supplied to the orbiting scroll 3
The two scrolls 2,
The sealed space formed by 3 gradually decreases and moves to the center of the scroll, and the refrigerant gas is increased in pressure and discharged from the central discharge hole 10. The discharged high-temperature and high-pressure refrigerant gas passes through the upper space 11a and the passage guide 6 in the sealed container 1, fills the lower space 11b around the electric motor, and passes through the discharge pipe connected through the sealed container 1. Led to the outside.

On the other hand, in a space 16 surrounded by the back surface of the orbiting scroll 3 and the frame 5 (this is referred to as a "back pressure chamber"), a plurality of closed spaces formed by the two orbiting and fixed scrolls 2 and 3 are provided. In order to oppose the gas force in the thrust direction due to the internal gas pressure (this force is a separating force for pushing down the orbiting scroll 3 downward), the intermediate pressure between the suction pressure (low pressure side pressure) and the discharge pressure is reduced. Works. This intermediate pressure is achieved by providing a fine hole 17 in the end plate of the orbiting scroll 3 , guiding the gas inside the scroll to the back pressure chamber 16 through the fine hole 17, and causing the gas to act on the back surface of the orbiting scroll 3 .
The method of applying the intermediate pressure is disclosed in JP-A-53-119412, JP-A-55-37520 and the like, and a detailed description thereof will be omitted.

Next, the flow of the lubricating oil will be described.

The lubricating oil 23 is stored in the lower part of the closed container 1. The lower end 7a of the main shaft 7 is immersed in the oil 23 at the bottom of the container,
An eccentric shaft portion 7b is provided on the upper portion of the main shaft, and the eccentric shaft portion 7b is engaged with the orbiting scroll 3 as a scroll compression element portion via an orbiting boss 25 . Eccentric vertical holes 18 and 19 for lubricating each bearing portion are formed in the main shaft 7 and the eccentric shaft 7b from the lower end of the main shaft 7 to the upper end surface of the eccentric shaft 7b. At the lower part of the eccentric shaft portion 7b, a balance weight 28 is formed integrally with the rotary shaft 7 so as to be engaged therewith. The lower end 7a of the main shaft immersed in the lubricating oil 23 is in an atmosphere of a high discharge pressure Pd, and the periphery of the bearing portion 8 of the revolving boss 25 on the downstream side is in an atmosphere of an intermediate pressure Pm. P
Due to the pressure difference m), the lubricating oil 23 at the bottom of the container rises in the eccentric vertical holes 18 and 19. In addition, by the rotation of the main shaft,
Centrifugal force acts on the oil in the eccentric vertical holes 18 and 19 to further increase the amount of oil supplied to each bearing. As described above, lubrication to each bearing portion is performed by eccentric hole lubrication and differential pressure lubrication. The lubricating oil that has risen inside the eccentric vertical holes 18 and 19 is supplied to the bearings 12 and 13 and is also provided in the upper space 24 of the eccentric shaft 7b (the bottom surface of the boss portion of the orbiting scroll boss 25 and the upper end surface of the eccentric shaft 7b). This space becomes a hydraulic chamber, hereinafter referred to as a "hydraulic chamber" 24). The lubricating oil of the hydraulic chamber 24 is the pressure substantially equal to the discharge pressure Pd, also bearing portion 8 and the bearing 12, 13 of the pivot boss 25
Is discharged to the back pressure chamber 16 through each bearing gap. After lubricating oil reaching the back pressure chamber 16 lubricates the Oldham mechanism and the like, it is injected into the compression chamber 9 formed by the two scrolls via the seat surface 35 of the fixed scroll 2 and the orbiting scroll 3 and the small holes 17, Thereafter, the gas is mixed with the refrigerant gas inside the scroll spiral.

The orbiting scroll 3 receiving the intermediate pressure in the back pressure chamber 16 is pressed against the fixed scroll 2 so as not to separate therefrom. The pressure generated at this time is spiral with the end plate 35 of the orbiting scroll 3 and the seat surface 31 of the fixed scroll 2.
Of the wrap of the wrap . The lubrication of the sliding surface responsible for these pressing forces is achieved by forming the width 34 of the seat surface 31 which is a ring-shaped sliding surface and the width t of the tooth tip of the spiral wrap 2a smaller than the turning diameter, and the contact surface. When moved, the original contact surface is completely exposed to the oil atmosphere so as to be wetted with oil.

[0019] However, the processing of the outer diameter portion 2 0 of the half volume of the winding end of the spiral wrap of the fixed scroll 2 is to equalize the thickness t of the spiral wrap, the dimensions of the outer shallow groove 36 It is determined by the diameter of the end mill cutting tool for machining. That is, it takes a processing time to reduce its diameter, the outer diameter of the fixed larger scroll 2 becomes larger, solid
Outside the half-turn at the end of the spiral wrap of constant scroll 2
The outer diameter of the diameter portion 20, as shown in FIG. 2, and the radius r of the center or al of the fixed scroll 2 performs lathe machining, reduced to a minimum radial width of the shallow groove 36, the fixed scroll 2 The outer diameter is reduced and workability is improved. However, in this shape, the vortex of the fixed scroll 2
The thickness t of the spiral wound at the end of the wound wrap becomes large, and the contact surface is not completely exposed to the oil atmosphere.
Refueling condition worsens. As a result, when severe operating conditions overlap, there is a defect that a galling phenomenon occurs in this portion.

[0020] In the first embodiment of the present invention, the end plate of the orbiting scroll 3 as shown in FIG. 3 wound half volume portion 50 of the end of the spiral wrap 2a of the fixed scroll 2 shown in FIG. 2 you sliding
The step 22 of 35 is provided with a step deeper by 15 to 20 μm, and an oil reservoir is formed in this section. Thus sump <br/> and to be able to perform fueling more reliably by providing the monitor, the surface pressure reducing this portion is Figure, since allows prevention of galling phenomenon, the severe operating conditions The reliability can be improved so as to withstand.

FIG . 4 shows a second embodiment of the fixed scroll according to the present invention .
It is the top view which looked at the Example from the spiral side. As shown in FIG. 4, the half-wound portion 50 at the end of the spiral wrap 2a of the fixed scroll 2 has a tooth height of 15 to 20 μm as compared with the other portions.
m. In this case, since the contact with the bottom surface of the orbiting scroll 3 can be eased, similar effects such as prevention of seizure and prevention of galling can be obtained.

[0022]

FIG. 5 shows a third embodiment of the fixed scroll according to the present invention .
It is the top view which looked at the Example from the spiral side. As shown in FIG.
Ku, approximately half volume from the winding finish end of the stationary scroll wrap 2 a
Among parts component 50, the other lap portion 2a only that the tooth tip portion
By making the outer part 51 of the tooth tip lower than the other part of the wrap 2a , for example, 10 to 15 μm lower than the other part of the wrap 2a so that the tooth thickness becomes equal to or less than the tooth thickness of the tooth tip, the tooth tip can make contact with the orbiting scroll bottom. when moving the contact surface by a swirling motion, always exposed to oil contained in the refrigerant gas width, so get wet by oil. Therefore , the lubrication of the contact surface is maintained , and the occurrence of seizure and biting can be avoided.

[0019]

According to the present invention , a fixed scroll wrap is provided.
Reliable lubrication to the part corresponding to almost half a turn from the end of the turn
And reduce the surface pressure in this area
Reliability by preventing galling
High scroll compressor can be provided .

[Brief description of the drawings]

1 is a common <br/> longitudinal sectional view of the embodiment of the scroll compressor of the present invention.

FIG. 2 is a plan view of the first embodiment of the fixed scroll in FIG . 1 as viewed from the spiral side.

FIG. 3 is a plan view of the first embodiment of the orbiting scroll in FIG . 1 as viewed from the spiral side.

FIG. 4 is a plan view of a second embodiment of the fixed scroll in FIG . 1 as viewed from the spiral side.

FIG. 5 is a plan view of a third embodiment of the fixed scroll in FIG . 1 as viewed from the spiral side.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Closed container, 2 ... Fixed scroll, 3 ... Orbiting scroll, 9 ... Compression chamber, 20 , 21 ... Outside diameter of a half winding part, 31 ...
Ring-shaped portion (seat surface), 51: stepped portion.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Hiroaki Kuno 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture, Japan Shimizu Plant, Hitachi, Ltd. (72) Inventor Kenji Tojo 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture, Shimizu Plant, Hitachi, Ltd. 72) Inventor Akira Murayama 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside the Shimizu Plant, Hitachi, Ltd. (72) Katsumi Yanagi 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside the Shimizu Plant, Hitachi, Ltd. (72) Yasuo Oishi, Shizuoka Prefecture 390 Muramatsu, Shimizu Ichimizu, Hitachi, Ltd. Shimizu Plant (72) Inventor Naomi Hagita 390, Muramatsu, Shimizu Ichizu, Shizuoka Prefecture Inside Hitachi Shimizu Engineering Co., Ltd. (56) References JP-A-58-172405 JitsuHiraku Akira 61-105785 (JP, U) JitsuHiraku Akira 59-192687 (JP, U) (58 ) investigated the field (Int.Cl. ⁶ DB name) F04C 18/02 311

Claims (7)

(57) [Claims] A fixed scroll member and an orbiting scroll member formed by erecting a spiral wrap on a head plate are engaged with each other with the wraps of the orbiting scroll member inward, and a boss portion of the orbiting scroll member is connected to a rotating shaft supported by a frame. The scroll member is engaged with the fixed scroll member without rotating by the Oldham mechanism, and gas is sucked from a suction port provided on the outer periphery of the fixed scroll member. It is moved towards the center of the enclosed space formed by the gas compressed by reducing the volume, eject compressed gas from the discharge port provided at the center portion, the fixed scroll, of said fixed scroll rack
A ring-shaped sheet surface at the same height on the outside of the
Approximately half a turn from the end of the scroll wrap
Shallow forming an outer diameter where the tooth thickness of the part is larger than the turning diameter
In the scroll compressor to have a groove on the inside of the ring-shaped seat surface have, winding end of the lap of the <br/> fixed scroll tooth thickness is larger than the orbiting diameter in a state in which a combination of fixed scroll and the orbiting scroll The gap between the tooth tip and the tooth bottom formed by the tooth tip portion corresponding to approximately a half turn from the end and the tooth bottom portion of the orbiting scroll corresponding thereto corresponds to the gap between the tooth tip and the tooth bottom in another region. A scroll compressor characterized in that it is larger than a gap formed between the scroll compressors. To 2. A method according to claim 1 which is deeply than in the tooth bottom portion of the other tooth bottom portion of the orbiting scroll corresponding to tooth tops fraction of a portion corresponding to approximately half volume from the winding finish end of the wrap of the fixed scroll The scroll compressor as described. 3. The end of winding of the fixed scroll wrap.
The root portion of the orbiting scroll corresponding to the tooth tip portion corresponding to approximately half a turn from the root portion of the other region is 15
3. The scroll compressor according to claim 2, wherein the scroll compressor is deepened by about 20 [mu] m. 4. The scroll compressor according to claim 1, wherein a tooth tip of a portion corresponding to substantially a half turn from a winding end of the wrap of the fixed scroll is lower than other regions. 5. The end of the fixed scroll wrap winding end
5. The scroll compressor according to claim 4, wherein a tip portion of a portion substantially corresponding to a half turn is lower by 15 to 20 μm than a tip portion of another region. 6. A fixed scroll member and an orbiting scroll member formed by erecting a spiral wrap on an end plate are engaged with each other so that the wraps of the orbiting scroll member are inwardly connected to each other, and a boss portion of the orbiting scroll member is connected to a rotating shaft supported by the frame. And the orbiting scroll member is caused to orbit relative to the fixed scroll member without rotating by the Oldham mechanism, and gas is suctioned from a suction port provided on an outer peripheral portion of the fixed scroll member. It is moved towards the center of the enclosed space formed by the gas compressed by reducing the volume, eject compressed gas from the discharge port provided at the center portion, the fixed scroll, La of the fixed scroll
A ring-shaped sheet surface of the same height on the outside of the
Equivalent to almost half a turn from the end of the constant scroll wrap
To form an outer diameter where the tooth thickness of the part
In the scroll compressor to have a shallow groove between said ring-shaped seat surface, a portion corresponding to approximately half volume from the winding finish end of the lap of the tooth thickness than the turning diameter increases <br/> the fixed scroll Touching the bottom of the orbiting scroll
The tooth thickness of the tip is equal to or equal to the thickness of other parts
A scroll compressor characterized by having the following thickness . 7. An outer portion of the wrap is formed so that the thickness of the tooth tip at a portion corresponding to approximately half a turn from the end of the orbiting scroll is smaller than the wrap thickness of the other portion. The scroll compressor according to claim 6, wherein the scroll compressor is configured to be lower than the tooth height.