JP6767640B2 - Scroll compressor - Google Patents

Description

The present invention relates to a scroll compressor.

In recent years, a partition plate is provided in a compression vessel, and a compression element having a fixed scroll and a swivel scroll and an electric element for swiveling and driving the swivel scroll are arranged in a chamber on the low pressure side partitioned by the partition plate. Type scroll compressors are known. In this type of closed scroll compressor, the boss portion of the fixed scroll is fitted into the holding hole of the partition plate, and the refrigerant compressed by the compression element is separated by the partition plate via the discharge port of the fixed scroll. A device having a configuration for discharging to a side chamber has been proposed (see, for example, Patent Document 1).

In a scroll compressor as represented by Patent Document 1, since the circumference of the compression element is a low-pressure space, a force is applied to the swivel scroll and the fixed scroll in a direction in which they are separated from each other.

Therefore, a tip seal is often used in order to improve the airtightness of the compression chamber formed by the swivel scroll and the fixed scroll.

However, in order to perform highly efficient operation, it is preferable to apply back pressure to the turning scroll or the fixed scroll. For example, Patent Document 2 applies back pressure to a fixed scroll and presses the fixed scroll against a swivel scroll to abolish the chip seal and improve the airtightness of the compression chamber.

JP-A-11-182463 Japanese Patent Application Laid-Open No. 4-255586

However, the above-mentioned patent document does not disclose a measure for preventing the fixed scroll from overturning due to the gas force in the compression chamber.

Therefore, the present invention comprises a partition plate that divides the inside of the closed container into a high-pressure space and a low-pressure space, a fixed scroll adjacent to the partition plate, a swivel scroll that meshes with the fixed scroll to form a compression chamber, and the swivel. It has a rotation suppressing member for preventing the rotation of the scroll and a main bearing for supporting the turning scroll, and the fixed scroll, the turning scroll, the rotation suppressing member, and the main bearing are arranged in the low pressure space. A scroll compressor in which the fixed scroll and the swivel scroll are arranged between the partition plate and the main bearing, and a bearing-side fitting portion formed on the main bearing and a scroll side formed on the fixed scroll. The fitting portion and the lower end portion are inserted into the bearing side fitting portion, and the upper end portion is located below the lower surface of the partition plate and has the same diameter and is inserted into the scroll side fitting portion. The lower end portion of the columnar member and the bearing side fitting portion are fixed, and the upper end portion of the columnar member and the scroll side fitting portion are slidably fitted in the axial direction. In addition to having a sliding surface between the columnar member and the scroll-side fitting portion, the fitting region between the columnar member and the scroll-side fitting portion and the spiral wrap of the fixed scroll are combined. Provided is a scroll compressor characterized in that the horizontal plane passing through the center of the height of the scroll intersects with each other.

According to the scroll compressor of the present invention, overturning of the fixed scroll can be prevented. Further, since the radial and tangential gas resultant forces applied to the fixed scroll can be reliably supported by the fitting region formed by the columnar member and the scroll-side fitting portion, it is possible to more reliably prevent the fixed scroll from capsizing. You can. In the unlikely event that the upper end of the columnar member and the fitting portion on the scroll side are fixed, and the lower end of the columnar member and the fitting portion on the bearing side are slidably fitted, the fixed scroll and the columnar The member is regarded as one rigid body, and the support point that receives the gas resultant force of the fixed scroll is the bearing side fitting part, and the center position of the spiral wrap height, which is the force point position of the gas resultant force in the radial and tangential directions of the fixed scroll. Then, the axial distance of the portion supporting the gas resultant force becomes long, and it becomes easy to overturn.

A vertical sectional view showing a configuration of a closed scroll compressor according to an embodiment of the present invention. (A) A side view showing a swivel scroll of the closed scroll compressor according to the present embodiment, (b) a sectional view taken along line XX of FIG. Bottom view showing a fixed scroll of the closed scroll compressor according to the present embodiment. Perspective view of the fixed scroll as seen from the bottom Perspective view of the fixed scroll seen from above Perspective view showing the main bearing of the closed-type scroll compressor according to this embodiment. Top view showing the rotation suppressing member of the closed scroll compressor according to this embodiment. Cross-sectional view of a main part showing a partition plate and a fixed scroll of a closed scroll compressor according to the present embodiment. Partial cross-sectional perspective view showing a main part of the closed scroll compressor according to the present embodiment. A vertical cross-sectional view showing the positional relationship between the horizontal plane A passing through the center of the spiral wrap height of the closed scroll compressor according to the present embodiment and the fitting portion region. In (a), the horizontal plane B of the fitting portion contact is the fitting portion due to the positional relationship between the horizontal plane A passing through the center of the spiral wrap height of the sealed scroll compressor according to the present embodiment and the horizontal plane B of the fitting portion contact. A cross-sectional view showing the case near the center, (b) is a cross-sectional view when the horizontal plane B of the fitting portion contact is the fitting portion end.

A first aspect of the present invention includes a partition plate that divides the inside of a closed container into a high-pressure space and a low-pressure space, a fixed scroll adjacent to the partition plate, and a swirl scroll that meshes with the fixed scroll to form a compression chamber. It has a rotation suppressing member for preventing the rotation of the turning scroll and a main bearing for supporting the turning scroll, and the fixed scroll, the turning scroll, the rotation suppressing member, and the main bearing are arranged in the low pressure space. A scroll compressor in which the fixed scroll and the swivel scroll are arranged between the partition plate and the main bearing, and the bearing side fitting portion formed on the main bearing and the fixed scroll are formed. The scroll side fitting portion and the lower end portion are inserted into the bearing side fitting portion, the upper end portion is located below the lower surface of the partition plate, and the same diameter is inserted into the scroll side fitting portion . A single columnar member is provided, the lower end portion of the columnar member and the bearing side fitting portion are fixed, and the upper end portion of the columnar member and the scroll side fitting portion are slidable in the axial direction. A sliding surface is provided between the columnar member and the scroll-side fitting portion, and the fitting region between the columnar member and the scroll-side fitting portion and the fixed scroll The horizontal plane passing through the height center of the spiral lap is in a positional relationship of intersection.

According to the first aspect, the center position of the spiral wrap height, which is the force point position of the gas resultant force in the radial direction and the tangential direction of the fixed scroll, and the fitting portion and the columnar member of the fixed scroll supporting the gas resultant force are formed. Since the axial distance from the fitting region to be fitted can be shortened, the rotational moment in the direction in which the fixed scroll overturns can be minimized, and overturning of the fixed scroll can be prevented.
Further, since the radial and tangential gas resultant forces applied to the fixed scroll can be reliably supported by the fitting region formed by the columnar member and the scroll-side fitting portion, it is possible to more reliably prevent the fixed scroll from capsizing. You can. In the unlikely event that the upper end of the columnar member and the mating portion on the scroll side are fixed, and the lower end of the columnar member and the fitting portion on the bearing side are slidably fitted, the fixed scroll and the columnar are formed. The member is regarded as one rigid body, and the support point that receives the gas resultant force of the fixed scroll is the bearing side fitting part, and the center position of the spiral wrap height, which is the force point position of the gas resultant force in the radial and tangential directions of the fixed scroll. Then, the axial distance of the portion supporting the gas resultant force becomes long, and it becomes easy to overturn.

The second aspect of the present invention, when the height of the spiral wrap of the fixed scroll H, the axial length of the fitting area between the upper end of the columnar member and the scroll-side fitting portion has a L, H It satisfies the relationship of / 2 ≧ L.

According to the second mode, the columnar member is installed at an angle within the clearance of the fitting area, or due to deformation during operation, etc., the contact point with the columnar member is at the lower end position or the upper end position of the fitting area. Even if there is, the distance between the center position of the spiral lap height, which is the power point position of the gas resultant force in the radial direction and the tangential direction of the fixed scroll, and the ground contact point can be kept relatively short. It is possible to prevent the fixed scroll from overturning.

In a third aspect of the present invention, the inner wall of the fixed spiral wrap of said fixed scroll, and formed up to near the end of the orbiting spiral wrap of the orbiting scroll, and said inner wall and outer wall of the orbiting spiral wrap of the fixed spiral wrap while the the closed narrowing the volume of the compression chamber to be formed, in which was different from the confinement volume of said fixed other of the compression chamber formed by the outer wall and the inner wall of the orbiting spiral wrap of the spiral wrap.

According to the third mode, the height of the spiral wrap can be lowered by ensuring the maximum confined volume of the intake gas. Therefore, the fixed scroll can move in the axial direction between the partition plate and the main bearing, and the pressure of the discharge space presses the fixed scroll against the swivel scroll to ensure the airtightness between the fixed scroll and the swivel scroll. In the compressor, the lower the height of the spiral wrap, the more stable the fixed scroll can be, so that the overturning of the fixed scroll can be further prevented.

The fourth aspect of the present invention is formed in the fixed scroll includes a suction portion communicating with said with said compression chamber low-pressure space, in the outer peripheral portion of the wrap end surface of the fixed spiral wrap of said fixed scroll, said main bearing when the minimum distance of the region not overlapping with the suction unit and the radial direction is R with respect to the bearing center, satisfies the relationship H ≦ R.

According to the fourth mode, the ground contact (contact) range between the end face of the spiral wrap of the fixed scroll and the swivel scroll becomes large, and the fixed scroll occurs when the fixed scroll is pressed against the swivel scroll by the pressure applied to the back surface of the fixed scroll. Since the rotational moment in the direction of preventing the scroll from overturning can be increased, it is possible to further prevent the fixed scroll from overturning.

Hereinafter, the first embodiment of the present invention will be described with reference to the drawings. The present invention is not limited to the following embodiments.

FIG. 1 is a vertical cross-sectional view showing the configuration of a closed scroll compressor according to the present embodiment. As shown in FIG. 1, this closed scroll compressor includes a closed container 10 formed in a cylindrical shape extending in the vertical direction.

A partition plate 20 for vertically partitioning the inside of the closed container 10 is provided on the upper part of the closed container 10. The partition plate 20 divides the inside of the closed container 10 into a high pressure space 11 and a low pressure space 12.

The closed container 10 is provided with a refrigerant suction pipe 13 for introducing the refrigerant into the low pressure space 12 and a refrigerant discharge pipe 14 for discharging the compressed refrigerant from the high pressure space 11. The bottom of the low pressure space 12 forms an oil sump 15 in which lubricating oil is stored.

The low-pressure space 12 is provided with a fixed scroll 30 and a swivel scroll 40 as compression mechanisms. The fixed scroll 30 is adjacent to the partition plate 20. The swivel scroll 40 is meshed with the fixed scroll 30 to form a compression chamber 50.

Below the fixed scroll 30 and the swivel scroll 40, a main bearing 60 for supporting the swivel scroll 40 is provided. A bearing portion 61 and a boss accommodating portion 62 are formed at substantially the center of the main bearing 60.

The bearing portion 61 pivotally supports the rotating shaft 70.

The rotating shaft 70 is supported by a bearing portion 61 and an auxiliary bearing 16. An eccentric shaft 71 eccentric with respect to the axis of the rotating shaft 70 is formed at the upper end of the rotating shaft 70.

An oil passage 72 through which the lubricating oil passes is formed inside the rotating shaft 70. A suction port 73 for lubricating oil is provided at the lower end of the rotating shaft 70. A paddle 74 is formed on the upper part of the suction port 73. The oil passage 72 communicates with the suction port 73 and the paddle 74, and is formed in the axial direction of the rotating shaft 70. The oil passage 72 includes a refueling port 75 for refueling the bearing portion 61, a refueling port 76 for refueling the auxiliary bearing 16, and a refueling port 77 for refueling the boss accommodating portion 62.

The eccentric shaft 71 is inserted into the boss 43 so as to be swivel-driven via the swing bush 78 and the swivel bearing 79.

The electric element 80 includes a stator 81 fixed to the closed container 10 and a rotor 82 arranged inside the stator 81.

The rotor 82 is fixed to the rotating shaft 70. Balance weights 17a and 17b are attached to the rotating shaft 70 above and below the rotor 82. The balance weight 17a and the balance weight 17b are arranged at positions shifted by 180 °. The centrifugal force generated by the revolving motion of the swivel scroll 40 is balanced with the centrifugal force generated by the balance weights 17a and 17b. The balance weights 17a and 17b may be fixed to the rotor 82.

The rotation suppressing member (oldham ring) 90 prevents the rotation scroll 40 from rotating. The swivel scroll 40 is supported by the fixed scroll 30 via a rotation suppressing member 90. As a result, the swivel scroll 40 makes a swivel motion with respect to the fixed scroll 30 without rotating.

The columnar member 100 prevents the fixed scroll 30 from rotating and moving in the radial direction, and allows the fixed scroll 30 to move in the axial direction. The fixed scroll 30 is supported by the main bearing 60 by the columnar member 100, and can move in the axial direction between the partition plate 20 and the main bearing 60.

The fixed scroll 30, the swivel scroll 40, the electric element 80, the rotation suppressing member 90, and the main bearing 60 are arranged in the low pressure space 12, and the fixed scroll 30 and the swivel scroll 40 are located between the partition plate 20 and the main bearing 60. Be placed.

The rotation shaft 70 rotates together with the rotor 82 by driving the electric element 80. The eccentric shaft 71 causes the swivel scroll 40 to swivel without rotating, and the refrigerant is compressed in the compression chamber 50.

The refrigerant is introduced into the low pressure space 12 from the refrigerant suction pipe 13. The refrigerant in the low pressure space 12 on the outer periphery of the swirl scroll 40 is guided to the compression chamber 50. After being compressed in the compression chamber 50, the refrigerant is discharged from the refrigerant discharge pipe 14 via the high-pressure space 11.

Due to the rotation of the rotating shaft 70, the lubricating oil stored in the oil sump 15 enters the oil passage 72 from the suction port 73 and is pumped upward along the paddle 74 of the oil passage 72. The pumped lubricating oil is supplied from the filler ports 75, 76, and 77 to the bearing portion 61, the auxiliary bearing 16, and the boss accommodating portion 62. The lubricating oil pumped up to the boss accommodating portion 62 is guided to the sliding surface between the main bearing 60 and the swivel scroll 40, is discharged through the return pipe 63 installed in the main bearing, and is returned to the oil sump 15 again.

FIG. 2A is a side view showing a swivel scroll of the closed scroll compressor according to the present embodiment, and FIG. 2B is a sectional view taken along line XX of FIG. 2A.

The swivel scroll 40 has a disk-shaped swirl scroll end plate 41, a spiral swirl swirl wrap 42 erected on the upper surface of the swirl scroll end plate 41, and a cylindrical shape formed substantially in the center of the lower surface of the swirl scroll end plate 41. It is equipped with the boss 43 of.

In FIG. 2B, a pair of first key grooves 91 are formed on the swivel scroll end plate 41.

FIG. 3 is a bottom view showing a fixed scroll of the closed scroll compressor according to the present embodiment, FIG. 4 is a perspective view of the fixed scroll as viewed from the bottom, and FIG. 5 is a perspective view of the fixed scroll as viewed from the top. is there.

The fixed scroll 30 is erected so as to surround the disk-shaped fixed scroll end plate 31, the spiral fixed spiral wrap 32 erected on the lower surface of the fixed scroll end plate 31, and the fixed spiral wrap 32. It is provided with a peripheral wall 33.

The terminal 32b here is a portion where the fixed spiral wrap 32 is formed from the inner wall and the outer wall, and the fixed spiral wrap 32 is further extended from the terminal 32b to the outermost outer peripheral portion 32c of the inner wall only by about 340 °. ..

A first discharge port 35 is formed at a substantially central portion of the fixed scroll end plate 31. Further, the fixed scroll end plate 31 is formed with a bypass port 36 and a medium pressure port 37. The bypass port 36 is located in the high pressure region just before the completion of compression in the vicinity of the first discharge port 35. The medium pressure port 37 is located in the intermediate pressure region during compression.

A suction portion 38 for taking the refrigerant into the compression chamber 50 is formed on the peripheral wall 33 of the fixed scroll 30. A second key groove 92 is formed in a part of the peripheral wall 33.

Further, a scroll side fitting portion 101 into which the upper end portion of the columnar member 100 is inserted is formed in a part of the peripheral wall 33.

As shown in FIG. 5, a boss portion 39 is formed in the center on the upper surface (the surface on the partition plate 20 side) of the fixed scroll 30. A first discharge port 35 and a bypass port 36 are formed in the boss portion 39.

Further, on the upper surface of the fixed scroll 30, a medium pressure space 30M is formed between the peripheral wall 33 and the boss portion 39 by a ring-shaped recess. A medium pressure port 37 is formed in the medium pressure space 30M. The medium pressure port 37 has a diameter smaller than the thickness of the inner wall and the outer wall of the swirl spiral wrap 42. By making the diameter of the medium pressure port 37 smaller than the thickness of the inner wall and the outer wall of the swirl swirl wrap 42, the compression chamber 50 formed on the inner wall side of the swirl swirl wrap 42 and the outer wall side of the swirl swirl wrap 42 are formed. Communication with the compression chamber 50 is prevented.

The boss portion 39 is provided with a bypass check valve 121 that can close the bypass port 36 and a bypass check valve stop 122. By using a reed valve for the bypass check valve 121, the height direction can be made compact. Further, the bypass check valve 121 uses a V-shaped reed valve on the bypass port 36 communicating with the compression chamber 50 formed on the outer wall side of the swirl swirl wrap 42 and on the inner wall side of the swirl swirl wrap 42. The bypass port 36 communicating with the formed compression chamber 50 can be closed.

FIG. 6 is a perspective view showing a main bearing of the closed scroll compressor according to the present embodiment.

The bearing portion 61 and the boss accommodating portion 62 are formed substantially in the center of the main bearing 60.

A bearing-side fitting portion 102 into which the lower end portion of the columnar member 100 is inserted is formed on the outer peripheral portion of the main bearing 60.

A return pipe 63 is formed in the main bearing 60 so as to communicate with the boss accommodating portion 62.

FIG. 7 is a top view showing a rotation suppressing member of the closed scroll compressor according to the present embodiment.

A first key 93 and a second key 94 are formed on the rotation suppressing member (oldham ring) 90. The first key 93 engages the first keyway 91 of the swivel scroll 40, and the second key 94 engages the second keyway 92 of the fixed scroll 30. Therefore, the swivel scroll 40 can rotate with respect to the fixed scroll 30 without rotating. Further, as shown in FIG. 1, the fixed scroll 30, the swivel scroll 40, and the old dam ring 90 are arranged in this order from above in the axial direction of the rotating shaft 70. Since the fixed scroll 30, the swivel scroll 40, and the old dam ring 90 are arranged in this order, the first key 93 and the second key 94 of the old dam ring 90 are formed on the same plane of the ring portion 95. Therefore, when processing the old dam ring 90, the first key 93 and the second key 94 can be processed from the same direction, and the number of times the old dam ring 90 is attached to and detached from the processing device can be reduced. The effect of improving accuracy and reducing processing costs can be obtained.

FIG. 8 is a cross-sectional view of a main part showing a partition plate and a fixed scroll of the closed scroll compressor according to the present embodiment.

A second discharge port 21 is formed at the center of the partition plate 20. The second discharge port 21 is provided with a discharge check valve 131 and a discharge check valve stop 132.

A discharge space 30H communicating with the first discharge port 35 is formed between the partition plate 20 and the fixed scroll 30. The second discharge port 21 communicates the discharge space 30H with the high pressure space 11. The discharge check valve 131 closes the second discharge port 21.

According to the present embodiment, the fixed scroll 30 is pressed against the swivel scroll 40 by applying a high pressure pressure to the discharge space 30H formed between the partition plate 20 and the fixed scroll 30, so that the fixed scroll 30 and the swivel scroll 40 are pressed. It is possible to eliminate the gap between the two and, and it is possible to perform highly efficient operation.

Further, according to the present embodiment, apart from the first discharge port 35, the compression chamber 50 and the discharge space 30H are communicated with each other by the bypass port 36, and the bypass port 36 is provided with the bypass check valve 121 for discharge. While preventing backflow from the space 30H, it can be guided to the discharge space 30H when a predetermined pressure is reached, so that high efficiency can be realized in a wide operating range.

The discharge check valve 131 is thicker than the bypass check valve 121.

The first discharge port 35 has a smaller volume than the second discharge port 21. This is to reduce the loss of the discharge pressure from the compression chamber 50.

Further, by forming a taper on the inflow side of the second discharge port 21, the loss of discharge pressure can be reduced.

The sealed scroll compressor according to the present embodiment has a ring-shaped first seal member 141 arranged on the outer periphery of the discharge space 30H between the partition plate 20 and the fixed scroll 30, and the partition plate 20 and the fixed scroll 30. It is provided with a ring-shaped second seal member 142 arranged on the outer periphery of the first seal member 141.

For the first sealing member 141 and the second sealing member 142, for example, polytetrafluoroethylene, which is a fluororesin, is suitable in terms of sealing property and assembling property. Further, the reliability of the seals of the first seal member 141 and the second seal member 142 is improved by mixing the fibrous material with the fluororesin.

The first seal member 141 and the second seal member 142 are sandwiched between the partition plate 20 by the closing member 150. By using an aluminum material for the closing member 150, caulking with the partition plate 20 can be performed.

A medium pressure space 30M is formed between the first sealing member 141 and the second sealing member 142. Since the medium pressure space 30M communicates with the compression chamber 50 in the intermediate pressure region during compression by the medium pressure port 37, a pressure lower than the pressure of the discharge space 30H and higher than the pressure of the low pressure space 12 is applied.

According to the present embodiment, by forming a medium pressure space 30M in addition to the high pressure discharge space 30H between the partition plate 20 and the fixed scroll 30, the pressing force of the fixed scroll 30 against the swivel scroll 40 is applied. Easy to adjust.

Further, according to the present embodiment, since the first seal member 141 and the second seal member 142 form the discharge space 30H and the medium pressure space 30M, the refrigerant from the high pressure discharge space 30H to the medium pressure space 30M. Leakage and leakage of the refrigerant from the medium pressure space 30M to the low pressure space 12 can be reduced.

Further, according to the present embodiment, since the first seal member 141 and the second seal member 142 are sandwiched between the partition plate 20 by the closing member 150, the partition plate 20, the first seal member 141, the second seal member 142, and Since the closing member 150 can be arranged in the closed container 10 after being assembled, the number of parts can be reduced and the scroll compressor can be easily assembled.

FIG. 9 is a partial cross-sectional perspective view showing a main part of the closed scroll compressor according to the present embodiment.

As shown in FIG. 9, the closing member 150 described with reference to FIG. 8 is composed of a ring-shaped member 151 and a plurality of projecting portions 152 formed on one surface of the ring-shaped member 151.

The outer peripheral portion of the first seal member 141 is sandwiched between the inner peripheral upper surface of the ring-shaped member 151 and the partition plate 20. Further, the inner peripheral portion of the second seal member 142 is sandwiched between the outer peripheral side upper surface of the ring-shaped member 151 and the partition plate 20.

The ring-shaped member 151 is attached to the partition plate 20 with the first seal member 141 and the second seal member 142 sandwiched therein.

To attach the closing member 150 to the partition plate 20, the protrusion 152 is inserted into the hole 22 formed in the partition plate 20, and the ring-shaped member 151 is pressed against the lower surface of the partition plate 20 at the end of the protrusion 152. Squeeze the part to fix it.

When the closing member 150 is attached to the partition plate 20, the inner peripheral portion of the first sealing member 141 projects toward the inner peripheral side of the ring-shaped member 151, and the outer peripheral portion of the second sealing member 142 is the ring-shaped member 151. It protrudes to the outer peripheral side.

Then, by mounting the partition plate 20 to which the closing member 150 is attached in the closed container 10, the inner peripheral portion of the first sealing member 141 is pressed against the outer peripheral surface of the boss portion 39 of the fixed scroll 30, and the second sealing is performed. The outer peripheral portion of the member 142 is pressed against the inner peripheral surface of the peripheral wall 33 of the fixed scroll 30.

FIG. 10 is a vertical cross-sectional view showing the positional relationship between the horizontal plane A passing through the center of the spiral wrap height of the closed scroll compressor according to the present embodiment and the fitting portion region.

A bearing-side fitting portion 102 is formed on the outer periphery of the main bearing 60, and a scroll-side fitting portion 101 is formed on the fixed scroll 30.

The lower end of the columnar member 100 is inserted into the bearing-side fitting portion 102, and the upper end is inserted into the scroll-side fitting portion 101.

In the present embodiment, the fitting region 101a between the columnar member 100 and the scroll-side fitting portion 101 and the horizontal plane passing through the center of the height H are formed when the height of the fixed spiral wrap 32 of the fixed scroll 30 is H. , There is an intersecting positional relationship. According to such a configuration, the center position of the height H of the fixed spiral wrap 32, which is the force point position of the gas resultant force in the radial direction and the tangential direction of the fixed scroll 30, and the scroll side of the fixed scroll 30 supporting the gas resultant force. Since the axial distance between the fitting portion 101 and the fitting region 101a formed by the columnar member 100 can be shortened, the rotational moment in the direction in which the fixed scroll 30 overturns can be minimized, and the fixed scroll 30 can be prevented from overturning. can do.

In the present embodiment, the lower end portion of the columnar member 100 and the bearing side fitting portion 102 are fixed, and the upper end portion of the columnar member 100 and the scroll side fitting portion 101 are slidably fitted in the axial direction. ing. According to such a configuration, the radius and the gas resultant force in the tangential direction applied to the fixed scroll 30 can be reliably supported by the fitting region 101a formed by the columnar member 100 and the scroll-side fitting portion 101, so that the fixed scroll can be reliably supported. The overturning of 30 can be prevented more reliably. In the unlikely event that the upper end of the columnar member 100 and the scroll-side fitting portion 101 are fixed, and the lower end of the columnar member 100 and the bearing-side fitting portion 102 are slidably fitted, The fixed scroll 30 and the columnar member 100 are regarded as one rigid body, and the support portion for receiving the gas resultant force of the fixed scroll 30 is the bearing side fitting region 102a, and the force point of the gas resultant force in the radial direction and the tangential direction of the fixed scroll 30. The distance between the central position of the height H of the fixed spiral wrap 32, which is the position, and the portion supporting the gas resultant force in the axial direction becomes long, and it becomes easy to overturn.

In FIG. 11A, the horizontal plane B of the fitting portion contact is fitted in the positional relationship between the horizontal plane A passing through the center of the spiral wrap height of the sealed scroll compressor according to the present embodiment and the horizontal plane B of the fitting portion contact. A cross-sectional view showing the case near the center of the joint portion, (b) is a cross-sectional view when the horizontal plane B of the fitting portion contact is the end of the fitting portion.

In the present embodiment, when the height H of the fixed spiral wrap 32 of the fixed scroll 30 and the axial length of the fitting region 101a between the upper end portion of the columnar member 100 and the scroll side fitting portion 101 are L, H. The relationship of / 2 ≧ L is satisfied. According to such a configuration, the columnar member 100 is installed at an angle within the clearance of the fitting region 101a, or is deformed during operation, and the lower end of the fitting region 101a as shown in FIG. 11B. Even if there is a grounding (contact) point with the columnar member 100 at the position, the center position of the height H of the fixed spiral wrap 32, which is the power point position of the gas resultant force in the radial direction and the tangential direction of the fixed scroll 30, and the grounding point. Since the distance L'to the (contact) point can be suppressed to be relatively short, overturning of the fixed scroll can be further prevented.

In the present embodiment, the bearing center of the main bearing 60 is formed at the suction portion 38 formed in the fixed scroll 30 and communicating the compression chamber 50 and the low pressure space 12 and the outer peripheral portion of the lap end surface of the fixed spiral wrap 32 of the fixed scroll 30. On the other hand, when the minimum distance of the region (thick solid line 32d in FIG. 3) that does not overlap with the suction portion 38 in the radial direction is R, the relationship of H ≦ R is satisfied. According to such a configuration, the ground contact (contact) range between the end surface of the fixed spiral wrap 32 of the fixed scroll 30 and the swivel scroll 40 becomes large, and the pressure applied to the back surface of the fixed scroll 30 causes the fixed scroll 30 to swivel scroll 40. Since the rotational moment in the direction of preventing the fixed scroll 30 from overturning when pressed against the fixed scroll 30 can be increased, the overturning of the fixed scroll 30 can be further prevented.

Further, in the present embodiment, the inner wall of the fixed swirl wrap 32 of the fixed scroll 30 is formed close to the end 32b of the swirl swirl wrap 42 of the swirl scroll 40, whereby the inner wall of the fixed swirl wrap 32 and the outer wall of the swirl swirl wrap 42 are formed. The confined volume of one compression chamber 50A formed by the above and the confined volume of the other compression chamber 50B formed by the outer wall of the fixed spiral wrap 32 and the inner wall of the swirl swirl wrap 42 are different.

According to the present embodiment, the compression ratio can be increased by ensuring the maximum confined volume of the intake gas, so that the heights of the fixed spiral wrap 32 and the swirl spiral wrap 42 can be lowered. Therefore, the fixed scroll 30 can move in the axial direction between the partition plate 20 and the main bearing 60, and the fixed scroll 30 is pressed against the swivel scroll 40 by the pressure of the discharge space 30H, so that the fixed scroll 30 and the swivel scroll 40 are pressed. In the scroll compressor that secures the airtightness with the scroll, the lower the height of the fixed swirl lap 32 and the swirl swirl wrap 42, the more stable the fixed scroll 30 can be.

Further, in the present embodiment, by providing the suction confinement position in the compression chamber 50A and the suction confinement position in the compression chamber 50B in the vicinity of the suction portion 38, the suction refrigerant passage can be minimized and the heat receiving loss can be reduced. ..

The present invention is useful for compressors of refrigeration cycle devices that can be used in electrical products such as water heaters, hot water heaters, and air conditioners.

10 Sealed container 11 High pressure space 12 Low pressure space 20 Partition plate 21 Second discharge port 30 Fixed scroll 30H Discharge space 30M Medium pressure space 31 Fixed scroll end plate 32 Fixed swirl wrap 33 Circumferential wall 35 First discharge port 36 Bypass port 37 Medium pressure port 38 Suction part 39 Boss part 40 Swivel scroll 41 Swivel scroll end plate 42 Swirl swirl wrap 43 Boss 50 Compression chamber 60 Main bearing 61 Bearing part 62 Boss accommodating part 63 Return pipe 70 Rotating shaft 71 Eccentric shaft 72 Oil passage 73 Suction port 74 Paddle 75 Refueling Mouth 80 Electric element 90 Rotation suppression member (Oldam ring)
100 Columnar member 101 Scroll side fitting part 102 Bearing side fitting part 121 Bypass check valve 131 Discharge check valve 141 First seal member 142 Second seal member 150 Closing member

Claims (4)

A partition plate that divides the inside of the closed container into a high-pressure space and a low-pressure space,
A fixed scroll adjacent to the partition plate
A swivel scroll that meshes with the fixed scroll to form a compression chamber,
A rotation suppressing member that prevents the rotation of the turning scroll and
It has a main bearing that supports the swivel scroll.
The fixed scroll, the swivel scroll, the rotation suppressing member, and the main bearing are arranged in the low pressure space.
A scroll compressor in which the fixed scroll and the swivel scroll are arranged between the partition plate and the main bearing.
The bearing-side fitting portion formed on the main bearing and
With the scroll side fitting portion formed on the fixed scroll,
A single columnar member having the same diameter and having the same diameter and having the lower end inserted into the bearing-side fitting portion and the upper end portion located below the lower surface of the partition plate and being inserted into the scroll-side fitting portion. Prepare,
The lower end of the columnar member and the bearing-side fitting portion are fixed, and the upper end of the columnar member and the scroll-side fitting portion are slidably fitted in the axial direction .
It has a sliding surface between the columnar member and the scroll-side fitting portion, and also has a sliding surface .
A scroll compressor characterized in that a fitting region between the columnar member and the scroll-side fitting portion and a horizontal plane passing through the height center of the spiral wrap of the fixed scroll intersect each other.
When the height of the spiral wrap of the fixed scroll is H and the axial length of the fitting region between the upper end portion of the columnar member and the scroll side fitting portion is L.
H / 2 ≧ L
The scroll compressor according to claim 1, wherein the scroll compressor satisfies the above-mentioned relationship.
The inner wall of the fixed spiral wrap of the fixed scroll is formed close to the end of the swirl wrap of the swirl scroll, and one of the compression chambers formed by the inner wall of the fixed swirl wrap and the outer wall of the swirl wrap. 1 or 2, wherein the confinement volume of the other compression chamber formed by the outer wall of the fixed swirl wrap and the inner wall of the swirl wrap is different from each other. Scroll compressor.
A suction unit formed on the fixed scroll and communicating the compression chamber and the low pressure space is provided.
When the minimum distance of the outer peripheral portion of the wrap end surface of the fixed spiral wrap of the fixed scroll and the region that does not overlap with the suction portion in the radial direction with respect to the bearing center of the main bearing is R.
H ≤ R
The scroll compressor according to any one of claims 1 to 3, wherein the scroll compressor satisfies the above-mentioned relationship.

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