JP2007154745A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor capable of improving volumetric efficiency and compression efficiency by surely sealing a fastening surface with keeping working deformation minimum. <P>SOLUTION: In the scroll compressor, a projection part 27 having a longitudinal direction in a circumference direction of one of a fixed scroll 6 and a main body frame 5 is provided on the fastening surface 26 at which the fixed scroll 6 and the main body frame 5 is closely fastened, and a mating recess part 29 meshing with a projection part 27 is provided on another. Consequently, circulation of gas between an inside space and an outside space of the main body frame 5 is inhibited and drop of compressor performance due to gas leak can be prevented. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a scroll compressor used for an air conditioner, a refrigerator, a blower, a water heater, and the like.

  Conventionally, this type of scroll compressor is effective in that a flexible structure is formed in the vicinity of the fastening surface between the fixed scroll and the main body frame, and the fastening surface of the fixed scroll and the main body frame is surface-bonded by elastic deformation of the flexible structure. Some have adopted a configuration for securing a seal (for example, see Patent Document 1).

FIG. 6 shows a conventional scroll compressor described in Patent Document 1. In FIG. As shown in FIG. 6, a fixed scroll flexible structure 201b is formed in the vicinity of the fastening surface between the fixed scroll 201 and the main body frame 204, and the sealing performance of the fastening surface is improved by deformation at the time of fastening.
Japanese Patent No. 2770627

  However, in the conventional configuration, when the fixed scroll flexible structure is processed into the fixed scroll, distortion due to the processing occurs in the fixed scroll, and deformation of the fixed scroll wrap may lead to an increase in leakage during compression. is there.

  Furthermore, when the working refrigerant is a high-pressure refrigerant such as carbon dioxide, in addition to the deformation of the flexible structure portion at the time of fastening, the pressure deformation of each component due to the high differential pressure becomes very large, leading to an increase in leakage at the time of compression. There is a possibility.

  The present invention solves the above-described conventional problems, and reliably seals the fastening surface between the fixed scroll and the main body frame, regardless of how the components of the compression mechanism are deformed by high differential pressure, while suppressing processing distortion. Accordingly, an object of the present invention is to provide a scroll compressor that suppresses the gas flow between the outer space and the inner space of the main body frame and prevents the deterioration of the compressor performance due to gas leakage.

  In order to solve the above-described conventional problems, the scroll compressor according to the present invention has a circumferential surface extending longitudinally on either the fixed scroll or the main body frame at a fastening surface where the fixed scroll and the main body frame are closely attached and fastened. A projecting portion is provided as a direction, and the other-side recessed portion engaging with the projecting portion is provided on the other side.

  In the conventional configuration, when the fixed scroll flexible structure is provided on the fixed scroll, the fixed scroll wrap may be distorted, and the leakage loss of the compression chamber may increase conversely. In addition to suppressing distortion, the fastening surface between the fixed scroll and the main body frame can be reliably sealed, and the flow of gas between the outer space and the inner space of the main body frame is suppressed, increasing leakage loss due to gas leakage Can be suppressed.

  The scroll compressor of the present invention can improve volumetric efficiency and compression efficiency by reliably sealing the fastening surface while minimizing processing distortion.

  In the first aspect of the present invention, the wrap forming a part of the orbiting scroll stands upright on the support disk with respect to the spiral fixed scroll wrap formed upright on one surface of the end plate forming a part of the fixed scroll. , Orbiting scroll wraps similar in shape to the fixed scroll wrap are meshed with each other to form a pair of spiral-shaped symmetrical compression spaces between the two scrolls, and a discharge port leading to the discharge chamber is formed at the center of the fixed scroll wrap. Provided, a suction chamber is provided outside the fixed scroll wrap, and the orbiting scroll performs the orbiting motion with respect to the fixed scroll via the rotation preventing member, whereby each compression space continuously shifts from the suction side to the discharge side. A scroll compressor that is divided into a plurality of compression chambers and changes in volume to compress fluid, and a crankshaft that orbits the orbiting scroll. The main body frame that supports the shaft is fastened to the fixed scroll, and the fastening surface where the fixed scroll and the main body frame are in close contact and fastened has the circumferential direction as the longitudinal direction on either the fixed scroll or the main body frame. By providing the convex part and the other side concave part engaging the convex part on the other side, the fastening surface between the fixed scroll and the main body frame can be reliably sealed by the labyrinth effect, and the outer space and the inner space of the main body frame can be sealed. It is possible to suppress the flow of gas between them and suppress an increase in leakage loss due to gas leakage.

  In particular, in a high-pressure scroll compressor in which the inner space of the sealed container is approximately the discharge pressure, the inner space of the main body frame that is suction pressure or intermediate pressure, that is, the orbiting scroll end plate, from the outer space of the main body frame that is the discharge pressure, that is, the closed container space Suppressing gas leakage into the back pressure chamber on the back reduces the volumetric efficiency decrease and the increase in recompression power due to the high pressure gas after compression leaking again into the suction chamber, resulting in a decrease in volumetric efficiency and compression efficiency. Can be kept to a minimum.

  Further, since it is not necessary to use a seal member, it is possible to improve the sealing performance of the fastening surface while suppressing an increase in cost due to an increase in the number of parts.

  In particular, in the scroll compressor according to the first aspect of the invention, the second concave portion having a width smaller than the width of the first convex portion provided on either the fixed scroll or the main body frame is provided in the first aspect. By providing one or a plurality of protrusions on one side and a mating recess on the other fastening surface that meshes with the first convex part, the leakage path between the inner peripheral side and the outer peripheral side of the fastening surface is further complicated. Therefore, it is possible to exert a further labyrinth effect and improve the sealing performance.

  Moreover, since the cross-sectional shapes of the convex portion and the concave portion are relatively simple, workability is easy, and an increase in processing cost can be suppressed.

  According to a third aspect of the invention, in particular, in the scroll compressor of the first aspect of the invention, the first convex portion provided on either the fixed scroll or the main body frame has one or a plurality of second convex portions and the second convex portion. It is composed of two recesses, and at the same time providing one or more third recesses in the second recess, repeatedly providing one or more third projections in the second projection, One or more N + 1th convex portions or concave portions are provided on the Nth convex portion or concave portion, and the other concave portion meshes with the first convex portion formed by setting N to 2 or more on the other part. Since the leakage path between the inner and outer circumferences of the fastening surface becomes very complicated and a high level of labyrinth effect can be expected, it is possible to reduce leakage at the fastening surface almost certainly. is there.

In a fourth aspect of the invention, in particular, in the scroll compressor according to any one of the first to third aspects, the cross-sectional shape of the convex portion provided on either the fixed scroll or the main body frame is formed by a combination of rectangles. Therefore, in the radial and axial gaps between the convex part and the mating concave part engaged with the convex part, the axial gap variation caused by the variation in the height of the convex part and the depth of the concave part, and the convex part and the concave part Because the gaps in the radial direction caused by machining variations in width are independent without interfering with each other, the radial and axial gap management after meshing is easy and stable leakage reduction is realized. Is possible.

  In addition, the height and width dimensions of the convex and concave portions can be easily and easily managed, so that variations in height and width can be suppressed and stable leakage reduction is achieved by minimizing gap variations. You can also.

  In a fifth aspect of the invention, in particular, in the scroll compressor according to any one of the first to third aspects, the cross-sectional shape of the convex portion provided on either the fixed scroll or the main body frame is a combination of a rectangle and a trapezoid or an arc. By improving the insertion, it is possible to improve the insertability when fitting the convex part to the concave part, and to suppress the increase in assembly man-hours, and to reduce the defective parts due to dents at the time of fitting and to improve the yield. Is also possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 is a longitudinal sectional view of a scroll compressor according to Embodiment 1 of the present invention.

  In FIG. 1, the entire inside of the iron sealed container 1 is a high-pressure atmosphere that communicates with the discharge pipe 2, a motor 3 at the center, a compression mechanism at the top, and a crankshaft fixed to the rotor 3 a of the motor 3. A main body frame 5 of a compression mechanism that supports one end of 4 is fixed to the sealed container 1, and a fixed scroll 6 is attached to the main body frame 5.

  The oil passage 7 in the main shaft direction provided in the crankshaft 4 has one end communicating with the oil supply pump device 8 and the other end finally communicating with the eccentric bearing 10 of the orbiting scroll 9. The orbiting scroll 9 that meshes with the fixed scroll 6 to form the compression chamber 11 includes a spiral orbiting scroll wrap 9a and a wrap support disc 9b in which an eccentric bearing 10 is erected. The fixed scroll 6 and the main body frame 5 It is arranged between.

  The fixed scroll 6 includes an end plate 6a and a spiral fixed scroll wrap 6b. A discharge port 12 is disposed at the center of the fixed scroll wrap 6b, and a suction chamber 13 is disposed at the outer periphery. An eccentric shaft 14 that is eccentric from the main shaft of the crankshaft 4 and is disposed at the upper end of the crankshaft 4 is configured to engage and slide with the eccentric bearing 10 of the orbiting scroll 9. Between the lap support disk 9b of the orbiting scroll 9 and the thrust bearing 15 provided on the main body frame 5, a minute gap capable of forming an oil film is provided. An annular seal member 16 that is substantially concentric with the eccentric bearing 10 is mounted on the lap support disk 9b in a loose state. The annular seal member 16 partitions the back chamber 17 inside and the back pressure chamber 18 outside. ing.

  The oil sucked up by the oil supply pump device 8 passes through the oil passage 7 of the crankshaft 4 and is guided to the axial internal space 20 formed between the eccentric bearing 10 and the eccentric shaft 14 of the orbiting scroll 9, and one of them is the orbit. The scroll 9 is fixedly scrolled through a throttle portion 21 provided on the back surface of the lap support disk 9b of the scroll 9 to a back pressure chamber 18 formed by being surrounded by the fixed scroll 6 and the main body frame 5. The oil is guided to the suction chamber 13 through the back pressure adjusting valve 22 having the function of pressing against the wrap 6b and the oil supply passage 22a. The other passes through the eccentric bearing 10, the back chamber 17, and the main bearing 19 and is discharged to the outside of the compression mechanism.

  A check valve device 23 that opens and closes the outlet side of the discharge port 12 is mounted on the plane of the end plate 6a of the fixed scroll 6, and the check valve device 23 includes a reed valve 23a made of a thin steel plate and a valve presser 23b. Become.

  The lower end of the crankshaft 4 is supported by a secondary bearing 24 fixed by welding or shrink fitting in the sealed container 1 and can rotate stably. The auxiliary bearing 24 has a journal bearing configuration, and a part of the oil sucked up by the oil supply pump device 8 is supplied to the auxiliary bearing 24.

  The gas compressed by the compression mechanism passes through a downward gas flow path 25 provided in the vicinity of the outer periphery of the compression mechanism, and is guided to the upper portion of the rotor 3a as shown by a dotted arrow. Here, the main bearing 19 and the like are joined with the oil discharged after lubrication, and after reaching the lower part of the rotor 3a via the rotor passage 3c provided in the rotor 3a, the mixed flow of gas and oil is subjected to centrifugal force. Collides with the lower coil end of the stator 3b and gas-liquid separation occurs. The gas after the gas-liquid separation is guided to the upper part of the electric motor 3 through a stator passage 3d provided on the outer periphery of the stator 3b, and passes through an upward gas passage (not shown) provided in the compression mechanism to the upper side of the compression mechanism. After reaching the space, it is discharged from the discharge pipe 2 to the outside of the sealed container 1.

  FIG. 2 is an enlarged view of the vicinity of the fastening surface 26 between the fixed scroll 6 and the main body frame 5 in FIG. 1, and the fixed scroll 6 is provided with a first convex portion 27a, and the first convex portion 27a is smaller than that. A second recess 28a is formed.

  On the other hand, the main body frame 5 is provided with a mating concave portion 29 so as to engage with the first convex portion 27a, and is fitted with a minute gap between the first convex portion 27a and the mating concave portion 29. .

  Although not shown, the fixed scroll 6 and the main body frame 5 are fastened by bolts.

  About the scroll compressor comprised as mentioned above, the operation | movement and an effect | action are demonstrated below.

  In FIG. 1, the pressure in the back pressure chamber 18, which is the space inside the main body frame 5, is set to an intermediate pressure slightly higher than the suction pressure by the back pressure adjustment valve 22, and the orbiting scroll 9 is fixed to the fixed scroll 6 with an appropriate thrust force. Gas leakage in the compression chamber 11 is suppressed.

  On the other hand, the scroll compressor of the present embodiment is a high-pressure type hermetic compressor in which the inside of the hermetic container 1 serves as a discharge pressure, and the outside of the main body frame 5 is at a high pressure.

  When the sealing performance of the fastening surface 26 between the fixed scroll 6 and the main body frame 5 is low, the compressed gas leaks into the back pressure chamber 18 due to the pressure difference between the inside and outside of the main body frame 5 and passes through the back pressure adjusting valve 22. It will return to the suction chamber 13. As a result, volumetric efficiency is reduced, and not only the refrigeration capacity of the compressor is reduced, but also the gas flows into the back pressure chamber 18 which originally has a high oil ratio, and the oil ratio is reduced, so that the compression mechanism section is reduced. As a result, the lubricity of the sliding portion is deteriorated and the mechanical efficiency is also lowered.

  When the convex portion 27 and the mating concave portion 29 are combined, minute gaps are secured in the axial direction and the radial direction, and the labyrinth effect is generated by complicating the leakage path of the fastening surface 26, and the fastening surface 26. The sealing performance is improved.

  Therefore, gas leakage from the outside of the main body frame 5 to the back pressure chamber 18 is reduced, and deterioration of volume efficiency and mechanical efficiency can be suppressed.

At the same time, there is no need to reduce the strength of the fixed scroll 6 or the vicinity of the fastening surface 26 of the main body frame 5 in order to improve the sealing performance of the fastening surface 26, so that it is not easy to follow each other. It is possible to suppress gas leakage between the compression chambers 11 due to deterioration of the lap shape.

  FIG. 3 is a front view of the main body frame 5 alone, and the counterpart recess 29 is provided in a semicircular shape. Since two notches 30 serving as gas passages are provided on the outer peripheral portion of the main body frame 5, the seal length of the fastening surface 26 in the vicinity of the notch 30 is short and the sealing performance is low. Accordingly, the semi-circular mating recess 29 is provided only in the vicinity of the notch 30 having a particularly low sealing performance to suppress the deterioration of the sealing performance of the fastening surface 26, and the unnecessary mating recess 29 is not provided to reduce the processing man-hours. The increase can be minimized.

  In addition, if the other party recessed part 29 is provided over a perimeter, a sealing performance can be improved more reliably, and even if it provides in the fixed scroll 6, the same effect is acquired.

  In addition, since the mating recess 29 is provided on the inner side of the bolt fastening hole 31, it is possible to suppress the gas leakage flow through the gap between the bolt fastening hole 31 and the bolt. Improvements can be realized.

  In this embodiment, the pressure in the back pressure chamber 18 is an intermediate pressure that is slightly higher than the suction pressure. However, the back pressure adjustment valve 22 is not provided, and the pressure in the back pressure chamber 18 is equal to the suction pressure. Is more effective because the differential pressure between the back pressure chamber 18 and the space outside the main body frame 5 is further enlarged.

  Further, the configuration of the high-pressure compressor has been described as an example. In the low-pressure compressor, when the pressure in the back pressure chamber 18 is an intermediate pressure slightly higher than the suction pressure, the back pressure chamber having an intermediate pressure is used. It is possible to suppress deterioration in volumetric efficiency due to gas leakage from 18 to the external space of the main body frame 5 at the suction pressure.

(Embodiment 2)
FIG. 4 is an enlarged view of the vicinity of the fastening surface 26 between the fixed scroll 6 and the main body frame 5 in the second embodiment of the present invention.

  The first convex portion 27a provided on the fixed scroll 6 includes a second concave portion 28a and a second convex portion 27b. On the other hand, a mating concave portion 29 is provided in the main body frame 5 so as to engage with the first convex portion 27a, and is fitted with a minute gap secured in the axial direction and the radial direction.

  By configuring such a complicated leakage path, the labyrinth effect is further exhibited, and the sealing performance of the fastening surface 26 can be further improved.

  It should be noted that a very complicated leakage path is formed by providing the third and fourth concave portions in the second concave portion 28a or by providing the third and fourth convex portions in the second convex portion 27b. Further, the sealing performance of the fastening surface 26 is further improved.

  In FIG. 4, the first convex portion 27 a is configured by a large and small rectangular shape, but due to such a rectangular configuration, the height of the convex portion 27 and the depth of the concave portion 28 or the counterpart concave portion 29 are caused by processing variations. Since the variation in the axial gap and the variation in the radial gap caused by the processing variation in the width of the convex portion 27 and the concave portion 28 or the counterpart concave portion 29 are independent without affecting each other, the diameter after meshing The gap management in the direction and the axial direction is easy, and stable leakage reduction can be realized.

  In addition, since the height and width dimensions of the convex portion 27 and the concave portion 28 or the counterpart concave portion 29 can be easily and easily managed, processing variations in height and width can be suppressed, and gap variations can be minimized. Stable leakage reduction can also be realized.

  In the example of FIG. 4, the cross-sectional shape of the convex portion 27 is complicated and difficult to process, and a significant increase in the number of processing steps is inevitable. However, if the cross-sectional shape of the convex portion 27 is simplified as shown in FIG. An increase in processing man-hours can be suppressed.

  On the other hand, in another enlarged view of the vicinity of the fastening surface 26 between the fixed scroll 6 and the main body frame 5 in the second embodiment of the present invention shown in FIG. 5, the cross section of the first convex portion 27 a provided on the fixed scroll 6. By forming the shape by a combination of trapezoids and making it tapered, the insertability when fitting the first convex portion 27a to the counterpart concave portion 29 is improved, and an increase in assembly man-hours can be suppressed, and fitting It is also possible to reduce component defects due to time dents and improve yield.

  The same effect can be obtained even if the cross-sectional shape of the first convex portion 27a is constituted by an arc, and the optimum convex shape that achieves both sealing and assembling by combining an arc, a trapezoid, and a rectangle. It is also possible to form

As described above, the scroll compressor according to the present invention has a convex surface with the circumferential direction as the longitudinal direction on either the fixed scroll or the main body frame on the fastening surface where the fixed scroll and the main body frame are fastened and fastened. The volumetric and compression efficiency can be improved by securely sealing the fastening surface while minimizing the processing strain by providing the other side and the other side concave part engaging the convex part. In addition to air conditioner compressors using HCFC-based refrigerants and HCFC refrigerants, the present invention can also be applied to applications such as air conditioners using natural refrigerant CO ₂ and heat pump water heaters.

The longitudinal cross-sectional view of the vertical scroll compressor in Embodiment 1 of this invention Enlarged view of the vicinity of the fastening surface between the fixed scroll and the main body frame in the first embodiment of the present invention Main body frame front view in Embodiment 1 of the present invention Enlarged view of the vicinity of the fastening surface between the fixed scroll and the main body frame in Embodiment 2 of the present invention Enlarged view of the vicinity of the fastening surface between another fixed scroll and the main body frame in Embodiment 2 of the present invention Enlarged view of the vicinity of the fastening surface between the conventional fixed scroll and body frame

Explanation of symbols

DESCRIPTION OF SYMBOLS 4 Crankshaft 5 Main body frame 6 Fixed scroll 6a End plate 6b Fixed scroll lap 9 Orbiting scroll 9a Orbiting scroll lap 9b Wrap support disk 11 Compression chamber 12 Discharge port 13 Suction chamber 26 Fastening surface 27 Convex part 29 Opposite side recessed part

Claims (5)

In contrast to the spiral fixed scroll wrap formed upright on one side of the end plate that forms part of the fixed scroll, the wrap that forms a part of the orbiting scroll stands upright on the support disc, and the fixed scroll wrap A revolving scroll wrap having a similar shape is meshed with each other to form a pair of spiral symmetric compression spaces between the scrolls, and a discharge port leading to a discharge chamber is provided at the center of the fixed scroll wrap. A suction chamber is provided outside the scroll wrap, and the orbiting scroll performs a orbiting motion with respect to the fixed scroll via a rotation preventing member, whereby the respective compression spaces continuously transition from the suction side toward the discharge side. A scroll compressor that is partitioned into a plurality of compression chambers and changes in volume to compress fluid;
A main body frame that supports a main shaft of a crankshaft that orbits the orbiting scroll is fastened to the fixed scroll, and at the fastening surface where the fixed scroll and the main body frame are tightly fastened, the fixed scroll or the A scroll compressor characterized in that a convex portion whose longitudinal direction is the circumferential direction is provided on one of the main body frames, and a mating concave portion that engages with the convex portion is provided on the other. One or a plurality of second concave portions having a width smaller than the width of the first convex portion provided on either the fixed scroll or the main body frame is provided on the first convex portion, and the second fastening surface is provided with the second concave portion. The scroll compressor according to claim 1, wherein a mating concave portion that engages with the first convex portion is provided. The first convex portion provided on either the fixed scroll or the main body frame is composed of one or a plurality of second convex portions and a second concave portion, and one or plural first convex portions are provided in the second concave portion. The third concave portion is provided simultaneously with the provision of one or more third convex portions on the second convex portion, and one or plural N + 1th convex portions are provided on the Nth convex portion or concave portion. The scroll compressor according to claim 1, further comprising a mating concave portion that meshes with the first convex portion formed by setting N to 2 or more in the other component. The scroll compressor in any one of Claims 1-3 in which the cross-sectional shape of the convex part provided in any one of a fixed scroll or a main body frame was formed by the combination of a rectangle. The scroll compressor according to any one of claims 1 to 3, wherein a cross-sectional shape of a convex portion provided on either the fixed scroll or the main body frame is formed by a combination of a rectangle and a trapezoid or an arc.

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