KR102671683B1 - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor capable of optimizing the position at which the load is applied to the orbiting scroll in the support member. The scroll compressor includes a fixed scroll fixed inside the main body, an orbiting scroll that engages with the fixed scroll and rotates, a rotating shaft that rotates the orbiting scroll, a holding member that holds the fixed scroll on the opposite side of the orbiting scroll, a rotating shaft and a holding member. It may include a support member provided between the orbiting scroll and supporting the orbiting scroll by a load applied to a position deviated from the center of the orbiting scroll.

Description

Scroll compressor{SCROLL COMPRESSOR}

The present invention relates to scroll compressors.

The inside of the sealed container is maintained at high pressure, and the sealed container is provided with a fixed scroll and a oscillating scroll in which each plate-shaped vortex tooth on a support plate meshes with each other to form a compression chamber, and a boss provided on the opposite side of the plate-shaped vortex teeth of the oscillating scroll. A main shaft that drives the oscillating scroll by inserting an eccentric shaft part into the main shaft, a compliant frame that supports the oscillating scroll in the axial direction and at the same time supports the main shaft that drives the oscillating scroll in the radial direction by the main shaft provided in the main shaft, and a compliant frame A scroll compressor is known that has a guide frame fixed to a sealed container by supporting the compliant frame in the radial direction, and allows the oscillating scroll to be moved in the axial direction by sliding the compliant frame in the axial direction with respect to the guide frame (e.g. For example, see patent literature).

Japanese Patent No. 5641978 (2014.11.07)

Here, when the orbiting scroll is supported by a support member provided between the rotating shaft that rotates the orbiting scroll and the holding member that holds the fixed scroll, the orbiting scroll can be moved in the axial direction by the axial sliding of the support member relative to the holding member. Adopting a configuration that only does this cannot optimize the position where the load is applied from the support member to the orbiting scroll.

The object of the invention is to optimize the position at which the load is applied from the support member to the orbiting scroll.

For this purpose, the present invention includes a fixed scroll fixed in a main body, an orbiting scroll that engages with the fixed scroll and rotates, a rotation axis that rotates the orbiting scroll, a holding member that holds the fixed scroll on the opposite side of the orbiting scroll, and a rotation axis and holding member. A scroll compressor including a support member provided between members and supporting the orbiting scroll by a load applied to a position deviated from the center of the orbiting scroll.

Here, the support member may be provided to be capable of being displaced in one direction with respect to the holding member.

Additionally, the support member may be displaceable in a direction along the rotation axis, and may be provided to be displaceable in a rotation direction around an imaginary axis approximately orthogonal to the rotation axis.

Additionally, the support member may be capable of being displaced in a rotation direction opposite to the moment generated in the orbiting scroll among the rotation directions around the virtual axis.

In this case, the support member can be displaced in the direction of rotation opposite to the moment generated in the orbiting scroll by receiving the reaction force from the holding member against the load received by the orbiting scroll at a specific position on the orbiting scroll side rather than the position receiving the load on the rotation axis. It could be. Additionally, the specific position may be between the end surface of the rotating shaft bearing of the support member on the orbiting scroll side and the surface of the orbiting scroll support plate on the side engaged with the fixed scroll.

Alternatively, the support member is on the same side as the orbiting scroll with respect to the position on which the load is received from the axis of rotation, and the gap at a specific position where the gap between the holding members is narrowest is on the opposite side of the orbiting scroll with respect to the position on which the load is received on the axis of rotation. By narrowing the gap between the holding members and the narrowest position, displacement in a rotational direction opposite to the moment generated in the orbiting scroll may be possible. Additionally, the specific position may be between the end surface of the rotating shaft bearing of the support member on the orbiting scroll side and the surface of the orbiting scroll support plate on the side engaged with the fixed scroll.

Additionally, the support member may be capable of being displaced in a rotational direction opposite to the moment generated in the orbiting scroll by contacting a protrusion provided on the holding member.

Additionally, the portion supporting the orbiting scroll of the support member may be shaped to exhibit elasticity when the support member is tilted and comes into contact with the surface of the orbiting scroll support plate on the side that is not engaged with the fixed scroll.

In addition, the present scroll compressor further includes an Oldham ring for preventing rotation of the orbiting scroll, and the Oldham ring may be combined with an orbiting scroll and a support member, an orbiting scroll and a holding member, or an orbiting scroll and a fixed scroll.

In addition, the present scroll compressor may be further equipped with a seal mechanism that forms an internal space between at least the holding member and the supporting member by sealing at least a portion of the gap between the holding member and the supporting member.

Additionally, the holding member may be provided with a passage inside the holding member for introducing the refrigerant derived from the compression chamber formed by engaging and rotating the orbiting scroll with respect to the fixed scroll into the internal space.

Additionally, the fixed scroll may be provided with a fixed scroll internal passage that draws refrigerant from the compression chamber and introduces it into the internal passage of the holding member.

Alternatively, the fixed scroll has a fixed scroll inner passage for introducing the refrigerant drawn from the compression chamber into the internal passage of the holding member, and the orbiting scroll has a orbiting scroll inner passage for drawing refrigerant from the compression chamber and introducing it into the fixed scroll inner passage. It may have been done. In this case, the fixed scroll internal passage may communicate with the orbiting scroll internal passage during at least part of the cycle in which the orbiting scroll rotates. Additionally, the fixed scroll inner passage may have an inlet on the orbit of the outlet of the orbiting scroll inner passage when the orbiting scroll rotates, and a groove portion that covers the entire orbit of the outlet of the orbiting scroll inner passage when the orbiting scroll rotates. It may be provided with an inlet connected to.

According to the present invention, the position where the load is applied from the support member to the orbiting scroll can be optimized.

1 is an axial cross-sectional view of a scroll compressor according to a first embodiment.
FIG. 2 is an axial cross-sectional view of the compression portion and the rotation shaft of a first modified example of the scroll compressor according to the first embodiment.
FIG. 3 is an axial cross-sectional view of a compression portion and a rotation shaft of a second modified example of the scroll compressor according to the first embodiment.
FIG. 4 is an axial cross-sectional view of the compression portion and the rotation shaft of the third modified example of the scroll compressor according to the first embodiment.
FIG. 5 is an axial cross-sectional view of the compression portion and the rotation shaft of the fourth modified example of the scroll compressor according to the first embodiment.
Figure 6 is an axial cross-sectional view of a scroll compressor according to the second embodiment.
FIG. 7A is a perspective view showing the moment received by the orbiting scroll, and FIG. 7B is a diagram showing the shape of the orbiting scroll about to be tilted.
Figure 8 is an axial cross-sectional view of the compression unit and the rotation shaft of the scroll compressor when the moment acting on the subframe is in the same direction as the moment acting on the orbiting scroll.
Figure 9 is an axial cross-sectional view of the compression unit and the rotation shaft of the scroll compressor when the moment acting on the subframe is in the opposite direction to the moment acting on the orbiting scroll.
Figure 10 is an axial cross-sectional view of the compression unit and the rotation shaft according to the first mounting example of the scroll compressor.
Figure 11 is an axial cross-sectional view of the compression unit and the rotation shaft according to a second mounting example of the scroll compressor.
Figure 12 is an axial cross-sectional view of the compression unit and the rotation shaft according to a third mounting example of the scroll compressor.
Fig. 13 is an axial cross-sectional view of the compression portion and the rotation shaft of the first modified example of the scroll compressor according to the second embodiment.
Fig. 14 is a top view of the end of the plate of the orbiting scroll in the compression section of the first modified example of the scroll compressor according to the second embodiment, viewed from above.
Fig. 15 is a bottom view of the body portion of the fixed scroll in the compression section of the first modified example of the scroll compressor according to the second embodiment, as seen from below.
Fig. 16 is an axial cross-sectional view of the compression section and the rotation shaft of a second modification of the scroll compressor according to the second embodiment.
Fig. 17 is a bottom view of the body portion of the fixed scroll in the compression portion of the second modified example of the scroll compressor according to the second embodiment, as seen from below.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the attached drawings. Meanwhile, the terms "front end", "rear end", "top", "bottom", "top" and "bottom" used in the following description are defined based on the drawings, and the shapes of each component are defined by these terms. and location is not limited.

This embodiment includes a fixed scroll, an orbiting scroll that engages with the fixed scroll and rotates, a rotation shaft that rotates the orbiting scroll, a holding member that holds the fixed scroll on the opposite side of the orbiting scroll, and a rotating shaft and a holding member provided between the rotating shaft and the holding member. In a scroll compressor including a support member, the support member supports the orbiting scroll by a load applied to a position shifted from the center of the orbiting scroll. That is, the support member may be provided to support the orbiting scroll at a position offset from the center of the orbiting scroll. Two configurations can be considered as specific configurations for supporting the orbiting scroll by the load applied to the position where the support member is shifted from the center of the orbiting scroll, and hereinafter, these two configurations will be described in the first embodiment and the second embodiment. It is explained in terms of form.

[First Embodiment]

1 is an axial cross-sectional view of a scroll compressor 1 according to the first embodiment.

The scroll compressor (1) is a compressor widely used in air conditioning devices, refrigerators, and pumps. Figure 1 shows a longitudinal cross-sectional view of a closed scroll compressor used in a refrigerant circuit of an air conditioning device.

The scroll compressor 1 is an example of a compression unit 10 that compresses the refrigerant, a drive motor 20 that drives the compression unit 10, and a main body that houses the compression unit 10 and the drive motor 20. It may include a furnace casing (30). In addition, the scroll compressor 1 according to the present embodiment is a vertical scroll compressor arranged so that the axial direction of the later-described rotation shaft 23 of the drive motor 20 is the direction of gravity. Hereinafter, the axial direction of the rotation axis 23 may be referred to as the “up and down direction,” the upper side as seen in FIG. 1 may be referred to as the “upper side,” and the lower side may be referred to as the “lower side.” In addition, although a vertical scroll compressor is described here as an example, the present invention is also applicable to a horizontal scroll compressor.

First, the compression unit 10 will be described.

The compression unit 10 includes a fixed scroll 11 fixed inside the casing 30, an orbiting scroll 12 that engages with the fixed scroll 11 and rotates, and a fixed scroll fixed to the casing 30 and ( A main frame 13 provided to hold the orbiting scroll 11), a sub-frame 14 disposed in a space surrounded by the orbiting scroll 12 and the main frame 13 and provided to support the orbiting scroll 12, and an orbiting scroll It may include an Oldam ring (15) for rotating the orbiting scroll (12) while preventing the rotation of (12).

The fixed scroll 11 may include a fixed scroll body and a fixed wrap 114 protruding from the fixed scroll body. The fixed wrap 114 may protrude downward from the fixed scroll body.

The fixed scroll body includes a cylindrical body portion 111, a plate 112 covering the upper opening of the body portion 111, and a protrusion 113 that protrudes radially outward from the lower end of the body portion 111. may include. The fixing wrap 114 protrudes downward from the lower end of the plate 112 and may be formed in a swirl shape when viewed from below.

The material of the fixed scroll 11 may be cast iron, for example, gray cast iron such as FC250.

A through hole 111a may be formed in the body portion 111 in the radial direction. The through hole 111a functions as an intake port for sucking refrigerant into the space surrounded by the body 111, the plate 112, and the orbiting scroll 12.

A through hole 112a may be formed in the center of the plate 112 in the vertical direction. The through hole 112a functions as a discharge port that discharges refrigerant from the space surrounded by the plate 112, the fixed wrap 114, and the orbiting scroll 12.

The fixed scroll 11 configured as above can be fixed to the main frame 13 using fastening members such as bolts or positioning pins that penetrate the installation holes formed in the protrusion 113 in the vertical direction.

The orbiting scroll 12 may include an orbiting scroll body and an orbiting wrap 122 protruding from the orbiting scroll body to engage with the fixed wrap 114 of the fixed scroll 11 to form the compression chamber 16. there is. The orbiting wrap 122 may be formed to protrude upward from the orbiting scroll body.

The orbiting scroll 12 is coupled to the rotation shaft 23 and can rotate.

The orbiting scroll body may include a disk-shaped plate 121 and a cylindrical body portion 123 protruding downward from a lower end of the plate 121. The swirl wrap 122 protrudes upward from the upper end of the plate 121 and may be formed in a swirl shape when viewed from above.

The material of the orbiting scroll 12 may be, for example, FC material or FCD material.

The orbiting wrap 122 of the orbiting scroll 12 may be engaged with the fixed wrap 114 of the fixed scroll 11. And, the orbiting wrap 122 of the orbiting scroll 12 and the fixed wrap 114 of the fixed scroll 11 are between the body portion 111, the plate 112, and the plate 121 of the fixed scroll 11. It can be placed in the formed space to partition the compression chamber 16. Then, the volume of the compression chamber 16 is reduced by swinging the swing wrap 122 with respect to the fixed fixed wrap 114 and the refrigerant is compressed. That is, the internal space between the fixed wrap 114 and the orbiting wrap 122 contracts toward the center of rotation to compress the refrigerant.

An eccentric shaft 232, which will be described later, of the rotating shaft 23 is inserted into the body portion 123 with a sliding bearing interposed therebetween. In this way, the body portion 123 functions as a bearing of the eccentric shaft 232.

The main frame 13 is an example of a holding member provided to hold the fixed scroll 11. The main frame 13 includes a cylindrical first body portion 131, a cylindrical second body portion 132 protruding downward from the radial inner side of the lower end of the first body portion 131, and a second cylindrical body portion 132. A cylindrical third body portion 133 protruding radially inward from the lower end of the body portion 132, and a cylindrical fourth body portion protruding upward and downward from the inner end of the third body portion 133 ( 134) may be included. And, in the main frame 13, the outer peripheral surface of the first body portion 131 is fixed to the central casing 31 of the casing 30, which will be described later. In addition, the rotation shaft 23, which will be described later, of the drive motor 20 is inserted inside the fourth body portion 134 with a journal bearing interposed therebetween. In this way, the main frame 13 also functions as a bearing that rotatably supports the rotating shaft 23.

The outer peripheral portion of the first body portion 131 is provided with a protruding portion 131a that protrudes upward from the upper end. A female thread is formed on the protrusion 131a, and a bolt passing through an installation hole formed in the protrusion 113 of the fixed scroll 11 is fastened to this female thread, thereby installing the fixed scroll 11 to the main frame 13. .

Additionally, a groove 131b extending vertically may be formed on the outer peripheral surface of the first body 131. That is, a groove 131b extending in the vertical direction from the center of the outer circumference to the bottom may be formed in the first body portion 131. In the first body portion 131, a portion where the groove 131b is formed may be spaced apart from the central casing 31.

The rotating shaft 23 is inserted into the inner periphery of the fourth body 134 with a journal bearing interposed therebetween, so that the fourth body 134 functions as a bearing that rotatably supports the rotating shaft 23.

The main frame 13 may further include a fixed scroll support surface 11a that supports the fixed scroll 11. The fixed scroll support surface 11a may be formed on the protrusion 131a.

The subframe 14 is an example of a support member that supports the orbiting scroll 12. A gap may be formed between the main frame 13 and the sub-frame 14 so that the sub-frame 14 can be displaced relative to the main frame 13. In other words, the sub-frame 14 may be placed inside the main frame 13 to be spaced apart from the main frame 13.

The subframe 14 may include a cylindrical first body portion 141 and a cylindrical second body portion 142 protruding downward from the lower end surface of the first body portion 141. And, the subframe 14 is between the outer peripheral surface of the first body portion 141 and the inner peripheral surface of the first body portion 131 of the main frame 13, and the inner peripheral surface of the second body portion 142 and the main frame ( Between the outer peripheral surface of the fourth body 134 of 13), the sub-frame 14 is spaced at a distance such that the sub-frame 14 can be displaced only in the axial direction of the rotation axis 23 with respect to the main frame 13, and the orbiting scroll 12 and It is placed in a space surrounded by the main frame (13).

In addition, a portion consisting of the fourth body portion 134 of the main frame 13 and the first body portion 141 of the sub-frame 14, and the first body portion 131 of the main frame 13 and the sub-frame The portion consisting of the first body portion 141 of (14) is formed with a first groove portion 141a and a second groove portion 141b that are concave downward from the upper end surface. In the radial direction, a first groove 141a is formed in the center, and a second groove 141b is formed between the first groove 141a and the protrusion 131a. Then, the body portion 123 of the orbiting scroll 12 is inserted into the first groove portion 141a. An Oldham ring 15 is disposed between the main frame 13 and the orbiting scroll 12 in the second groove 141b to prevent the rotation of the orbiting scroll 12.

In addition, the compression unit 10 described above is formed with a discharge passage (not shown) that discharges the refrigerant compressed in the compression chamber 16. Among the discharge passages, the discharge passage that discharges the high-pressure refrigerant is connected to a through hole (112a) of the plate (112) that discharges the refrigerant in a space containing high-pressure refrigerant, one end of which is surrounded by the fixed scroll (11) and the orbiting scroll (12). It is connected, and the other end is connected to the space below the main frame 13 within the casing 30, and is also connected to the chamber 121a. In addition, among the discharge passages, the discharge passage that discharges the intermediate pressure refrigerant is connected to a discharge port (not shown) that discharges the refrigerant in the space containing the intermediate pressure refrigerant, one end of which is surrounded by the fixed scroll 11 and the orbiting scroll 12. And the other end is connected to the chambers 121b and 142a.

Next, the drive motor 20 will be described.

The drive motor 20 is fixed to the casing 30 below the compression unit 10. The drive motor 20 includes a stator 21 constituting a stator, a rotor 22 constituting a rotor, a rotating shaft 23 that supports the rotor 22 and rotates with respect to the casing 30, and a rotating shaft. It may include a support member 24 that rotatably supports (23).

The stator 21 may include a stator body 211 and a coil 212 wound around the stator body 211. The stator body 211 is a laminate of multiple electrical steel sheets, and is approximately cylindrical in shape. In addition, the outer circumferential diameter of the stator body 211 is formed to be larger than the inner circumferential diameter of the central casing 31 of the casing 30, which will be described later, so that the stator main body 211 (stator 21) is attached to the central casing 31. It is inserted with an interference fit. A method of fitting the stator body 211 into the central casing 31 may include, for example, shrink fit or press fit.

In addition, the stator main body 211 is provided with a plurality of teeth (not shown) in the circumferential direction on the inner portion facing the outer circumference of the rotor 22. The coil 212 is disposed in a slot (not shown) existing between adjacent teeth. In the stator 21 according to this embodiment, the coil 212 may be an example of a concentrated coil inserted into a slot existing between a plurality of adjacent teeth.

The rotor 22 is a laminate of a plurality of ring-shaped electromagnetic steel plates, and has an overall cylindrical shape. In addition, the inner peripheral diameter of the rotor 22 is formed to be smaller than the outer peripheral diameter of the rotating shaft 23, and the rotating shaft 23 is fitted into the rotor 22 with an interference fit. An example of a method of inserting the rotating shaft 23 into the rotor 22 is press fitting. Then, the rotor 22 is fixed to the rotation shaft 23 and rotates together with the rotation shaft 23. Additionally, the rotor 22 may have a permanent magnet embedded therein as an example.

The outer circumferential diameter of the rotor 22 is smaller than the inner circumferential diameter of the stator body 211 of the stator 21, so there is a gap between the rotor 22 and the stator 21.

The rotation shaft 23 may include a main shaft 231 on which the rotor 22 is inserted, and an eccentric shaft 232 provided on the upper part of the main shaft 231 and having a shaft center eccentric from the axis center of the main shaft 231. there is.

The lower part of the main shaft 231 is rotatably supported by the support member 24, and the upper part is rotatably supported by the main frame 13 of the compression unit 10. Additionally, the eccentric shaft 232 is rotatably supported on the body portion 123 of the orbiting scroll 12.

And, a through hole 233 is formed in the rotation shaft 23, which penetrates the rotation shaft 23 in the axial direction. In addition, the rotating shaft 23 has a first communicating hole 234 that communicates the through hole 233 and the bearing of the support member 24, and a second communicating hole 234 that communicates the through hole 233 and the bearing of the main frame 13. A communicating hole 235 and a third communicating hole 236 communicating with the through hole 233 and the bearing of the body portion 123 are formed in the radial direction.

The support member 24 may include a cylindrical first body portion 241 and a cylindrical second body portion 242 protruding downward from a lower end of the first body portion 241. And, the support member 24 is fixed to the central casing 31 so that the outer peripheral surface of the first body portion 241 faces the inner peripheral surface of the central casing 31 of the casing 30, which will be described later. And, the rotating shaft 23 is inserted inside the first body 241 and the second body 242 with a journal bearing interposed therebetween. Therefore, the support member 24 functions as a bearing that rotatably supports the rotation shaft 23.

Additionally, a hole (not shown) and a groove (not shown) are formed in the first body portion 241 to communicate with the space above and below the first body portion 241.

A pump 243 for pumping lubricating oil is mounted at the lower end of the second body portion 242 of the support member 24.

Next, the casing 30 will be described.

The casing 30 includes a cylindrical central casing 31 disposed at the center in the vertical direction, an upper casing 32 covering the upper opening of the central casing 31, and a lower casing covering the lower opening of the central casing 31. It may include a casing (33). In addition, the casing 30 has a discharge part 34 that discharges the high-pressure refrigerant compressed in the compression part 10 to the outside of the casing 30, and a suction part ( 35) may further be included.

As described above, the main frame 13 of the compression unit 10, the stator 21 of the drive motor 20, and the support member 24 are fixed to the central casing 31. Additionally, the discharge portion 34 and the suction portion 35 are constructed by inserting a pipe into a through hole formed in the central casing 31. The suction portion 35 is also provided at a position corresponding to the through hole 111a formed in the body portion 111 of the fixed scroll 11, so that the fixed scroll 11 and the orbiting scroll ( Inhale the refrigerant into the space surrounded by 12).

The lower casing 33 is shaped like a bowl, making it possible to collect lubricant.

Next, the operation of the scroll compressor 1 will be described.

When the drive motor 20 of the scroll compressor 1 is driven, the rotation shaft 23 rotates so that the orbiting scroll 12 inserted into the eccentric shaft 232 of the rotation shaft 23 rotates with respect to the fixed scroll 11. . As the orbiting scroll (12) rotates with respect to the fixed scroll (11), low-pressure refrigerant is sucked into the space surrounded by the fixed scroll (11) and the orbiting scroll (12) from the outside of the casing (30) through the suction portion (35). do. Then, this refrigerant is compressed according to the change in volume of the compression chamber 16. The high-pressure refrigerant compressed in the compression chamber (16) flows out downward from the compression section (10).

The high-pressure refrigerant flowing out of the compression section 10 is discharged to the outside of the casing 30 through the discharge section 34 provided in the casing 30. Additionally, while the refrigerant is discharged to the outside of the casing 30, it passes through the gap between the rotor 22 and the stator 21 or the gap between the stator 21 and the central casing 31. Then, the high-pressure refrigerant discharged to the outside of the casing 30 goes through each cycle of condensation, expansion, and evaporation in the refrigerant circuit and is then sucked in again from the suction unit 35.

Meanwhile, the lubricating oil collected in the lower casing 33 of the casing 30 is pumped up by the pump 243 and rises along the through hole 233 formed in the rotating shaft 23. The raised lubricating oil is supplied to each bearing of the rotating shaft 23 through the first communication hole 234, the second communication hole 235, and the third communication hole 236 formed in the rotating shaft 23, or the compression unit ( It is supplied to the sliding part of 10). In addition, the lubricant supplied to the sliding part of the compression unit 10 or the lubricant supplied to the bearing of the rotating shaft 23 through the second communication hole 235 and the third communication hole 236 is formed in the main frame 13. It returns to the lower casing 33 through the groove 131b, the gap between the rotor 22 and the stator 21, the axial hole formed in the support member 24, etc., and gathers at the lower part of the casing 30. In this process and in the process where the high-pressure refrigerant passes through the gap between the rotor 22 and the stator 21 before being discharged to the outside of the casing 30, the lubricant and refrigerant flow to the low-pressure side while cooling the drive motor 20. do. The lubricating oil flowing with the high-pressure refrigerant is then separated from the refrigerant and collects in the lower part of the casing 30.

As described above, in the scroll compressor 1 according to the present embodiment, the sub-frame 14 supporting the orbiting scroll 12 is disposed in the space surrounded by the orbiting scroll 12 and the main frame 13.

In a typical scroll compressor, the subframe 14 is not disposed, so the moment load received by the orbiting scroll 12 from the refrigerant sucked in from the suction part 35 is divided into the top thrust load and the rotation of the fixed scroll 11. This is offset by the back pressure load of the scroll (12). On the other hand, in the scroll compressor 1 according to the present embodiment, as shown, the moment load F _M received by the orbiting scroll 12 from the refrigerant sucked in the suction part 35 is the main, and the fixed scroll 11 It is offset by the upper surface thrust reaction force F _U and the lower surface thrust reaction force F _L of the subframe 14.

In this case, the distance from the point of application of the top thrust reaction force F _U to the point of application of the bottom thrust reaction force F _L becomes longer, so the bottom thrust reaction force F _L may be smaller than the back load of a general scroll compressor. Additionally, the top thrust reaction force F _U may also be small. Therefore, the scroll compressor 1 according to the present embodiment improves efficiency by reducing the friction loss between the fixed scroll 11 and the orbiting scroll 12, and the upper surface of the plate 121 of the orbiting scroll 12 and the Reliability is improved by reducing the load on the sliding part.

Next, a modified example of the scroll compressor 1 according to this embodiment will be described.

FIG. 2 is an axial cross-sectional view of the compression portion and the rotation shaft of a first modified example of the scroll compressor according to the first embodiment.

The compression unit 10 according to the first modified example of the scroll compressor 1, similar to FIG. 1, includes a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub frame 14, and , may include Oldham Ring (15). In addition, seal members 123c and 123d are provided to seal the gap between the body portion 123 of the orbiting scroll 12 and the fourth body portion 134 of the main frame 13. That is, seal members 123c and 123d may be provided between the body portion 123 of the orbiting scroll 12 and the fourth body portion 134 of the main frame 13. In this first modification, the inside of the chamber 121a is maintained at high pressure by providing these seal members 123c and 123d. In addition, the gap between the first body 141 of the sub-frame 14 and the first body 131 of the main frame 13 (the first gap between the sub-frame 14 and the main frame 13 ) As an example of the first seal member for sealing, seal members 141c and 141d are provided, and at the same time, the fourth body portion 134 of the main frame 13 is attached to the second body portion 142 of the subframe 14. Seal members 142c and 142d are provided as an example of a second seal member that seals the gap (second gap between the subframe 14 and the main frame 13). In this first modification, the pressure within the chamber 142a is maintained at a specific intermediate pressure by providing seal members 141c, 141d, 142c, and 142d.

Additionally, in the first modification, seal members 141c, 141d, 142c, and 142d were provided to seal the gap between the subframe 14 and the main frame 13. However, this can be further understood as providing a seal mechanism that seals the gap between the sub-frame 14 and at least one member opposing the sub-frame 14.

FIG. 3 is an axial cross-sectional view of a compression portion and a rotation shaft of a second modified example of the scroll compressor according to the first embodiment.

In the compression unit 10 according to the second modification example of the scroll compressor 1 shown in FIG. 2, the compression unit 10 according to the first modification example of the scroll compressor 1 has an outer diameter of the subframe 14. is maximized. By moving the Oldham ring 15 radially inward, the position where the first body portion 141 of the subframe 14 supports the orbiting scroll 12 is moved radially outward. In this second modified example, the distance from the point of application of the top thrust reaction force to the point of application of the bottom thrust reaction force becomes the maximum, so the top thrust reaction force and the bottom thrust reaction force become minimum.

FIG. 4 is an axial cross-sectional view of the compression portion and the rotation shaft of the third modified example of the scroll compressor according to the first embodiment.

The compression unit 10 according to the third modification of the scroll compressor 1 is the compression unit 10 according to the second modification of the scroll compressor 1 shown in FIG. 4 Guide members (134g, 134h) are provided in the body portion 134. Here, the guide members 134g and 134h may be rails. Additionally, a wheel rolling on a rail may be provided in the subframe 14 as a guiding member. In this third modified example, guide members 134g and 134h are provided on the fourth body portion 134 of the main frame 13, so that the sub-frame 14 is not tilted and the rotation axis 23 is rotated with respect to the main frame 13. ), displacement is possible only in the axial direction.

Fig. 5 is an axial cross-sectional view of the compression section and the rotation shaft of the fourth modification of the scroll compressor according to the first embodiment.

The compression unit 10 according to the fourth modification of the scroll compressor 1 is the compression unit 10 according to the first modification of the scroll compressor 1 shown in FIG. 2 Instead of providing seal members 142c and 142d to seal the gap between the body portion 142 and the fourth body portion 134 of the main frame 13, the first body portion of the sub-frame 14 Seal members 141e and 141f are provided at 141 as an example of a third seal member that seals the gap between the orbiting scroll 12 and the plate 121. In this fourth modification, the seal members 141c, 141d, 141e, and 141f are provided to allow the refrigerant in the chamber 142a to flow into the chamber 121b so that the pressure in the chamber 121b is the same as the pressure in the chamber 142a. It is maintained at a certain intermediate pressure.

In addition, in the fourth modification, seal members 141c and 141d seal the gap between the subframe 14 and the main frame 13, and seal members 141c and 141d seal the gap between the subframe 14 and the orbiting scroll 12. Seal members 141e and 141f were provided. However, this can be understood further as providing a seal mechanism that seals the gap between the sub-frame 14 and at least one member opposing the sub-frame 14.

As such, in this embodiment, the orbiting scroll 12 is positioned in a space surrounded by the orbiting scroll 12, the rotation axis 23, and the main frame 13 so that it can be displaced only in the axial direction of the rotation axis 23 with respect to the main frame 13. ) was prepared to support the subframe (14). Therefore, the pressure applied to the orbiting scroll 12 from the subframe 14 is equalized regardless of the location, and the thrust load for stabilizing the orbiting scroll 12 is reduced to improve the efficiency and reliability of the scroll compressor 1. It was possible to improve.

Additionally, in this embodiment, the sub-frame 14 can be displaced relative to the main frame 13 only in the direction along the rotation axis 23. However, this does not mean that the sub-frame 14 does not move at all with respect to the main frame 13 other than displacement in the direction along the rotation axis 23. In addition to displacement in the direction along the rotation axis 23, rotation around the rotation axis 23, displacement in the direction along an axis perpendicular to the rotation axis 23, and rotation around an axis perpendicular to the rotation axis 23. If even rotation about an axis perpendicular to the rotation axis 23 is not possible, other displacements or rotations may be possible. In broader terms, this can be understood as enabling the sub-frame 14 to be displaced in a direction along the rotation axis 23 with respect to the main frame 13. Additionally, it can be understood that the sub-frame 14 can be displaced in one direction with respect to the main frame 13.

[Second Embodiment]

Figure 6 is an axial cross-sectional view of a scroll compressor according to a second embodiment.

The scroll compressor 2 is a compressor widely used for air conditioners, refrigerators, and heat pumps. Figure 6 shows a longitudinal cross-sectional view of a closed scroll compressor used in the refrigerant circuit of an air conditioning device.

The scroll compressor 2 is an example of a compression unit 10 that compresses the refrigerant, a drive motor 20 that drives the compression unit 10, and a main body that houses the compression unit 10 and the drive motor 20. It may include a furnace casing (30). In addition, the scroll compressor 2 according to the present embodiment is a vertical scroll compressor arranged so that the axial direction of the later-described rotation shaft 23 of the drive motor 20 is the direction of gravity. Hereinafter, the axial direction of the rotation axis 23 may be referred to as the “up and down direction,” the upper side as seen in FIG. 6 may be referred to as the “upper side,” and the lower side may be referred to as the “lower side.” In addition, although a vertical scroll compressor is described here as an example, the present invention is also applicable to a horizontal scroll compressor.

First, the compression unit 10 will be described.

The compression unit 10 includes a fixed scroll 11 fixed inside the casing 30, an orbiting scroll 12 that engages with the fixed scroll 11 and rotates, and a fixed scroll fixed to the casing 30 and ( A main frame 13 provided to hold 11), a sub-frame 14 disposed between the rotation axis 23 and the main frame 13, which will be described later, and provided to support the orbiting scroll 12, and an orbiting scroll ( It may include an Oldham ring 15 for rotating the orbiting scroll 12 while preventing rotation of the rotation 12).

The fixed scroll 11 may include a fixed scroll body and a fixed wrap 114 protruding from the fixed scroll body. The fixed wrap 114 may protrude downward from the fixed scroll body.

The fixed scroll body includes a cylindrical body portion 111, a plate 112 covering the upper opening of the body portion 111, and a protrusion 113 that protrudes radially outward from the lower end of the body portion 111. It can be included. The fixing wrap 114 protrudes downward from the lower end of the plate 112 and may be formed in a swirl shape when viewed from below.

The material of the fixed scroll 11 is cast iron, for example, gray cast iron of FC250.

A through hole 111a may be formed in the body portion 111 in the radial direction. The through hole 111a functions as an intake port for sucking refrigerant into the space surrounded by the body 111, the plate 112, and the orbiting scroll 12.

A through hole 112a may be formed in the center of the plate 112 in the vertical direction. The through hole 112a functions as a discharge port that discharges refrigerant from the space surrounded by the plate 112, the fixed wrap 114, and the orbiting scroll 12.

The fixed scroll 11 configured as described above can be fixed to the main frame 13 using fastening members such as bolts or positioning pins that pass through installation holes formed in the protrusion 113 in the vertical direction.

The orbiting scroll 12 may include an orbiting scroll body and an orbiting wrap 122 protruding from the orbiting scroll body to engage with the fixed wrap 114 of the fixed scroll 11 to form the compression chamber 16. there is. The orbiting wrap 122 may be formed to protrude upward from the orbiting scroll body.

The orbiting scroll body may include a disk-shaped plate 121 and a cylindrical body portion 123 protruding downward from a lower end of the plate 121. The swirl wrap 122 protrudes upward from the upper end of the plate 121 and may be formed in a swirl shape when viewed from above.

The material of the orbiting scroll 12 may be FC material or FCD material as an example.

The orbiting wrap 122 of the orbiting scroll 12 may be engaged with the fixed wrap 114 of the fixed scroll 11. And, the orbiting wrap 122 of the orbiting scroll 12 and the fixed wrap 114 of the fixed scroll 11 are between the body portion 111, the plate 112, and the plate 121 of the fixed scroll 11. It can be placed in the formed space to partition the compression chamber 16. Then, by swinging the swing wrap 122 with respect to the fixed fixed wrap 114, the volume of the compression chamber 16 is reduced and the refrigerant is compressed. That is, the internal space between the fixed wrap 114 and the orbiting wrap 122 contracts toward the center of rotation to compress the refrigerant.

An eccentric shaft 232, which will be described later, of the rotating shaft 23 is inserted into the body portion 123 with a sliding bearing interposed therebetween. Therefore, the body portion 123 functions as a bearing of the eccentric shaft 232.

The main frame 13 is an example of a holding member provided to hold the fixed scroll 11. The main frame 13 includes a cylindrical first body portion 131, a cylindrical second body portion 132 protruding downward from the radial inner side of the lower end of the first body portion 131, and a second cylindrical body portion 132. It may include a cylindrical third body portion 133 that protrudes radially inward from the lower end of the body portion 132. A shaft through-hole 133a into which the rotation shaft 23 is inserted may be formed in the third body portion 133. And, in the main frame 13, the outer peripheral surface of the first body portion 131 is fixed to the central casing 31 of the casing 30, which will be described later. Additionally, in the second embodiment, unlike the first embodiment, the main frame 13 does not support the rotation shaft 23 of the drive motor 20, which will be described later.

The outer periphery of the first body 131 is provided with a protrusion 131a that protrudes upward from the upper end. A female thread is formed on the protrusion 131a, and a bolt passing through an installation hole formed in the protrusion 113 of the fixed scroll 11 is fastened to this female thread, thereby installing the fixed scroll 11 to the main frame 13. .

Additionally, a groove 131b extending vertically may be formed on the outer peripheral surface of the first body 131. That is, a groove 131b extending in the vertical direction from the center of the outer circumference to the bottom may be formed in the first body portion 131. In the first body portion 131, a portion where the groove 131b is formed may be spaced apart from the central casing 31.

The main frame 13 may further include a fixed scroll support surface 11a that supports the fixed scroll 11. The fixed scroll support surface 11a may be formed on the protrusion 131a.

The subframe 14 is an example of a support member that supports the orbiting scroll 12. A gap may be formed between the main frame 13 and the sub-frame 14 so that the sub-frame 14 can be displaced relative to the main frame 13. In other words, the sub-frame 14 may be placed inside the main frame 13 to be spaced apart from the main frame 13.

The subframe 14 includes a cylindrical first body portion 141, a cylindrical second body portion 142 protruding downward from the lower end surface of the first body portion 141, and a second body portion ( It may include a cylindrical third body portion 143 protruding downward from the inner end surface of 142). The third body portion 143 may have a smaller width than the first body portion 141 and the second body portion 142. Specifically, the width of the inner peripheral surface of the third body portion 143 may be smaller than the width of the inner peripheral surface of the first body portion 141 and the width of the inner peripheral surface of the second body portion 142. The third body portion 143 may be inserted into the shaft through hole 133a to be positioned between the rotation shaft 23 and the third body portion 133 of the main frame 13. In addition, the rotation shaft 23, which will be described later, of the drive motor 20 is inserted inside the third body portion 143 with a journal bearing interposed therebetween. Accordingly, the subframe 14 also functions as a bearing that rotatably supports the rotating shaft 23. The subframe 14 may be provided to be capable of displacement relative to the main frame 13 along at least one of the axial direction of the rotation axis 23 and a direction perpendicular to the axial direction of the rotation axis 23. In other terms, the subframe 14 is between the outer peripheral surface of the first body 141 and the inner peripheral surface of the first body 131 of the main frame 13, and the outer peripheral surface of the third body 143. Between the inner peripheral surfaces of the third body portion 133 of the main frame 13, the sub-frame 14 is displaceable in the axial direction of the rotation axis 23 with respect to the main frame 13, and is approximately about the rotation axis 23. It is disposed between the rotation axis 23 and the main frame 13 at a distance that allows displacement in the rotation direction about an orthogonal virtual axis.

In addition, a portion consisting of the first body portion 131 of the main frame 13 and the third body portion 143 of the sub-frame 14, and the first body portion 131 of the main frame 13 and the sub-frame The portion consisting of the first body portion 141 of (14) is formed with a first groove portion 141a and a second groove portion 141b that are concave downward from the upper end surface. In the radial direction, a first groove 141a is formed in the center, and a second groove 141b is formed between the first groove 141a and the protrusion 131a. Then, the body portion 123 of the orbiting scroll 12 is inserted into the first groove portion 141a. An Oldham ring 15 is disposed between the main frame 13 and the orbiting scroll 12 in the second groove 141b to prevent the rotation of the orbiting scroll 12.

In addition, the compression unit 10 described above is formed with a discharge passage (not shown) that discharges the refrigerant compressed in the compression chamber 16. Among the discharge passages, the discharge passage that discharges the high-pressure refrigerant is connected to a through hole (112a) of the plate (112) that discharges the refrigerant in a space containing high-pressure refrigerant, one end of which is surrounded by the fixed scroll (11) and the orbiting scroll (12). It is connected, and the other end is connected to the space below the main frame 13 in the casing 30, and is further connected to the chamber 121a. In addition, among the discharge passages, the discharge passage that discharges the intermediate pressure refrigerant is connected to a discharge port (not shown) that discharges the refrigerant in the space containing the intermediate pressure refrigerant, one end of which is surrounded by the fixed scroll 11 and the orbiting scroll 12. And the other end is connected to the chambers 121b and 142a.

Since the drive motor 20 and the casing 30 are the same as those described in the first embodiment, their description is omitted here.

In addition, since the operation of the scroll compressor 2 is the same as that described in the first embodiment, the description is omitted here.

On the other hand, in this scroll compressor 2, the orbiting scroll 12 tends to tilt under the compression load of the gas.

Figure 7a is a perspective view showing the moment received by the orbiting scroll. As shown in FIG. 7A, the orbiting scroll 12 receives a compressive load F _t from the main axis 231 of the rotation axis 23 to the eccentric axis 232 from a direction perpendicular to the eccentric direction and the horizontal plane. Then, a clockwise moment M _S is generated in the orbiting scroll 12 when viewed from viewpoint A.

Figure 7b is a diagram showing a shape in which an orbiting scroll is about to be tilted. Specifically, FIG. 7B is a diagram showing how the orbiting scroll 12 is about to tilt when viewed from viewpoint A of FIG. 7A. As shown in FIG. 7B, the orbiting scroll 12 is about to tilt by receiving a compressive load F _t and generating a clockwise moment load.

Meanwhile, the subframe 14 receives a lateral load from the axis and tries to move in the direction of the load accordingly.

Figure 8 is an axial cross-sectional view of the compression unit and the rotation shaft of the scroll compressor when the moment acting on the subframe is in the same direction as the moment acting on the orbiting scroll.

It is assumed that the position supporting the lateral load F _MJ on the axis is on the opposite side to the orbiting scroll 12 with respect to the lateral load F _MJ , as shown in FIG. That is, for example, it is assumed that the protrusion 135 of the main frame 13 contacts the sub-frame 14, and a reaction force R _MJ acting on the sub-frame 14 is generated at the position shown in FIG. 8. Then, the moment M _F acting on the subframe 14 is clockwise in the same direction as the moment M _S acting on the orbiting scroll 12, and thus the tilt of the orbiting scroll 12 cannot be effectively suppressed.

Therefore, in this embodiment, the lateral load on the axis is used to generate a moment in the subframe 14 in the opposite direction to the orbiting scroll 12 to suppress the tilt of the orbiting scroll 12. This is an example of enabling the subframe 14 to be displaced in a direction opposite to the moment generated in the orbiting scroll 12 among the rotation directions centered on an imaginary axis approximately orthogonal to the rotation axis 23.

Figure 9 is an axial cross-sectional view of the compression unit and the rotation shaft of the scroll compressor when the moment acting on the subframe is in the opposite direction to the moment acting on the orbiting scroll.

In this embodiment, as shown in FIG. 9, the subframe 14 is structured to support the orbiting scroll 12 on the same side with respect to the lateral load F _MJ on the axis. That is, for example, the protrusion 136 formed on the inner surface of the main frame 13 contacts the sub-frame 14, thereby generating a reaction force R _MJ acting on the sub-frame 14 at the position shown in FIG. 9. Accordingly, a counterclockwise moment M _F is generated in the subframe 14 to effectively suppress the tilt of the orbiting scroll 12. This is an example of allowing the reaction force from the holding member in response to the load received by the orbiting scroll to be received at a specific position on the orbiting scroll side rather than the location receiving the load on the rotation axis. Here, the position that generates the reaction force R _MJ operating on the subframe 14 may be a position between L1 and L2 in FIG. 9. L1 is the end surface position of the third body portion 143 of the subframe 14 on the orbiting scroll 12 side. If this cross section is inclined, it may be at the lowest position of the end face. L1 is an example of the end surface position on the orbiting scroll side of the rotary shaft bearing of the support member. Additionally, L2 is the position of the surface on which the orbiting wrap 122 of the plate 121 of the orbiting scroll 12 is formed. In other words, the plate 121 of the orbiting scroll 12 may include a orbiting wrap forming surface 121aa on which the orbiting wrap 122 is formed, and L2 is the position of the orbiting wrap forming surface 121aa. If this surface is inclined, it may be at the uppermost position of the surface. L2 is an example of the surface position of the side engaged with the fixed scroll of the orbiting scroll support plate.

In addition, in order to generate the reaction force R _MJ acting on the sub frame 14 at the position shown in FIG. 9, when the orbiting scroll 12 is about to tilt, the first body portion 131 of the main frame 13 and the sub frame 13 The first body 141 of the frame 14 may be in contact with the third body 133 of the main frame 13 and the third body 143 of the sub-frame 14. That is, when the sub-frame 14 is tilted during the displacement process, the protrusion 136 of the main frame 13 and the first body 141 of the sub-frame 14 become the third body of the main frame 13. It may contact before the third body portion 143 of the subframe 133 and the subframe 14. More strictly speaking, when the thrust surface supporting the orbiting scroll 12 of the sub-frame 14 is approximately parallel to the thrust surface of the fixed scroll 11, the first body portion 131 of the main frame 13 and the sub-frame The first cylindrical portion 141 of (14) may be in contact with the third body portion 133 of the main frame 13 and the third body portion 143 of the sub-frame 14.

To this end, the gap between the first body 131 of the main frame 13 and the first body 141 of the sub-frame 14 is adjusted to the third body 133 of the main frame 13 and the sub-frame. It may be narrower than the gap between the third body portions 143 of (14). This refers to the narrowest gap between the orbiting scroll and the retaining member on the same side with respect to the position receiving the load on the rotation axis, and the gap between the retaining member and the orbiting scroll on the opposite side with respect to the position receiving the load on the rotation axis. This is an example of making the spacing narrower than that of a narrow position. Here, the gap between the first body 131 of the main frame 13 and the first body 141 of the sub-frame 14 may be between L1 and L2 in FIG. 9. L1 is the end surface position of the third body portion 143 of the subframe 14 on the orbiting scroll 12 side. In addition, when this end surface is inclined, it may be located at the lowest side of the end surface. L1 is an example of the end surface position on the orbiting scroll side of the rotary shaft bearing of the support member. Additionally, L2 is the position of the surface on which the orbiting wrap 122 of the plate 121 of the orbiting scroll 12 is formed. If this surface is inclined, it may be set at the uppermost position of that surface. L2 is an example of the surface position of the side engaged with the fixed scroll of the orbiting scroll support plate.

Additionally, in this embodiment, as shown in FIG. 9, the subframe 14 may include a thrust bearing 144 having an orbiting scroll support surface 144a supporting the orbiting scroll 12. there is. The thrust bearing 144 may have a shape capable of elastic deformation. Specifically, the thrust bearing 144 of the subframe 14 is rotated so that the orbiting scroll 12 is tilted on the outer peripheral side of the thrust bearing 144 of the subframe 14 and the orbiting wrap 122 is not formed. It may be of a shape that exhibits elasticity when in contact with one surface of the scroll 12. Through this, the thrust load is distributed and local contact is suppressed. Here, the shape of the thrust bearing 144 shown in FIG. 9 is merely an example, and may be any shape that can exhibit elasticity. The thrust bearing 144 is an example of a part that supports the orbiting scroll of the support member, and the shape of the thrust bearing 144 in FIG. 9 has a side that does not engage with the fixed scroll of the orbiting scroll support plate due to the orbiting scroll being tilted. This is an example of a shape that exhibits elasticity when in contact with a surface.

Next, an example of mounting the scroll compressor 2 according to the present embodiment to the Oldham ring 15 will be described.

Figure 10 is an axial cross-sectional view of the compression unit and the rotation shaft according to the first mounting example of the scroll compressor.

As in FIG. 1, the compression unit 10 according to the first mounting example of the scroll compressor 2 includes a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub-frame 14, and , may include Oldham Ring (15). And in this first mounting example, the Oldham ring 15 is coupled or engaged with the orbiting scroll 12 and the subframe 14. Specifically, two pairs of Oldham ring guide grooves 121g are formed in a substantially straight line on the lower surface of the plate 121 of the orbiting scroll 12. In each Oldham ring guide groove 121g, two pairs of key parts 15b formed on the upper surface of the ring part 15a of the Oldham ring 15 are coupled or engaged so as to be able to slide back and forth. In addition, on the upper surface of the first body 141 of the subframe 14, two pairs of Oldham ring guide grooves 141g having a phase difference of approximately 90° with the Oldham ring guide groove 121g of the orbiting scroll 12 are provided. ) is formed on an approximately straight line. In each Oldham ring guide groove 141g, two pairs of key parts 15c formed on the lower surface of the ring part 15a of the Oldham ring 15 are coupled or engaged so as to be able to slide back and forth. The Oldham ring 15 configured in this way allows the turning scroll 12 to make a turning movement without rotating.

Figure 11 is an axial cross-sectional view of the compression unit and the rotation shaft according to a second mounting example of the scroll compressor.

As in FIG. 1, the compression unit 10 according to the second mounting example of the scroll compressor 2 includes a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub-frame 14, and , may include Oldham Ring (15). And in this second mounting example, the Oldham ring 15 is coupled or engaged with the orbiting scroll 12 and the main frame 13. Specifically, two pairs of Oldham ring guide grooves 121g are formed in a substantially straight line on the lower surface of the plate 121 of the orbiting scroll 12. In each Oldham ring guide groove 121g, two pairs of key parts 15b formed on the upper surface of the ring part 15a of the Oldham ring 15 are coupled or engaged so as to be able to slide back and forth. In addition, on the upper surface of the first body portion 131 of the main frame 13, two pairs of Oldham ring guide grooves 131g having a phase difference of approximately 90° with the Oldham ring guide groove 121g of the orbiting scroll 12 are provided. ) is formed on an approximately straight line. In each Oldham ring guide groove 131g, two pairs of key parts 15d formed on the lower surface of the ring part 15a of the Oldham ring 15 are coupled or engaged so as to be able to slide back and forth. The Oldham ring 15 configured in this way allows the turning scroll 12 to make a turning movement without rotating.

Figure 12 is an axial cross-sectional view of the compression unit and the rotation shaft according to a third mounting example of the scroll compressor.

The compression unit 10 according to the third mounting example of the scroll compressor 2, as in FIG. 1, includes a fixed scroll 11, an orbiting scroll 12, a main frame 13, a sub-frame 14, and , may include Oldham Ring (15). And in this third mounting example, the Oldham ring 15 is coupled or engaged with the orbiting scroll 12 and the fixed scroll 11. Specifically, two pairs of Oldham ring guide grooves 121g are formed in a substantially straight line on the lower surface of the plate 121 of the orbiting scroll 12. In each Oldham ring guide groove 121g, two pairs of key parts 15b formed on the upper surface of the ring part 15a of the Oldham ring 15 are coupled or engaged so as to be able to slide back and forth. In addition, on the lower surface of the plate 112 of the fixed scroll 11, two pairs of Oldham ring guide grooves 112g having a phase difference of approximately 90° with the Oldham ring guide groove 121g of the orbiting scroll 12 are provided. It is formed on a straight line. In each Oldham ring guide groove 112g, two pairs of key parts 15e formed on the upper surface of the ring part 15a of the Oldham ring 15 are coupled or engaged so as to be able to slide back and forth. The Oldham ring 15 configured in this way allows the turning scroll 12 to make a turning movement without rotating.

However, in a configuration in which the subframe 14 supporting the orbiting scroll 12 can be displaced only in the direction along the rotation axis 23, the moment acting on the subframe 14 is not controlled and the trend is followed. It becomes. If you do this, the thrust reaction force cannot be positioned effectively and it will not be effective. In contrast, in this embodiment, the thrust reaction force can be determined at an ideal position, thereby maximizing the effect.

Also, in the second embodiment, as in the first embodiment, a space surrounded by the main frame 13 and the sub-frame 14 is formed by two seal members between the main frame 13 and the sub-frame 14. . Then, the subframe 14 can be pushed against the orbiting scroll 12 by introducing a specific pressure (intermediate pressure) from the compression chamber 16 to this space during the compression stroke. There are mainly two methods for realizing this, which will be described in detail as a first modified example and a second modified example below.

Fig. 13 is an axial cross-sectional view of the compression portion and the rotation shaft of the first modified example of the scroll compressor according to the second embodiment. In other words, FIG. 13 is an axial cross-sectional view of the compression unit 10 and the rotation shaft 23 according to the first modified example of the scroll compressor 2.

The compression unit 10 according to the first modified example of the scroll compressor 2 includes a fixed scroll 11, an orbiting scroll 12, a main frame 13, and a sub-frame 14, as shown in FIG. 6. It can be included. The orbiting scroll 12 engages and rotates with respect to the fixed scroll 11 to form the compression chamber 16. The compression chamber 16 sucks in and compresses low-pressure refrigerant as indicated by an arrow through the radial through hole 111a, and discharges high-pressure refrigerant as indicated by an arrow through the vertical through hole 112a. The illustration of Oldham Ring (15) is omitted.

In addition, the compression portion 10 is provided with a seal member 171a that seals the gap between the body portion 123 of the orbiting scroll 12 and the third body portion 143 of the subframe 14. In this first modification, the chamber 171 is formed by providing the seal member 171a, and the inside of the chamber 171 is maintained at high pressure.

In addition, the compression unit 10 is provided with a seal member 172a that seals the gap between the main frame 13 and the sub-frame 14 so that a chamber 172 is formed between the main frame 13 and the sub-frame 14. , 172b) can be provided. A seal member 172a is provided to seal the gap between the second body 132 of the main frame 13 and the first body 141 of the sub-frame 14, and at the same time, the first body 132 of the main frame 13 is provided. A seal member 172b is provided to seal the gap between the third body portion 133 and the third body portion 143 of the subframe 14. These seal members 172a and 172b correspond to the two seal members described above. In this first modification, the chamber 172 is formed by providing seal members 172a and 172b.

Additionally, the compression unit 10 may be provided with passages 181, 182, and 183 to guide the refrigerant discharged from the compression chamber 16 to the chamber 172. Specifically, the compression unit 10 includes a first passage 181, a second passage 182, and a third passage 183 for guiding refrigerant of a specific pressure from the compression chamber 16 to the chamber 172. It is provided. The first passage 181 may be provided in the orbiting scroll 12 to communicate with the compression chamber 16. The first passage 181 is a passage that penetrates the inside of the orbiting scroll 12 and is an example of a passage inside the orbiting scroll. The first passage 181 draws the refrigerant from the compression chamber 16, flows it, and introduces the refrigerant into the second passage 182. The second passage 182 may be provided in the fixed scroll 11 to connect the first passage 181 and the third passage 183. The second passage 182 is a passage passing through the fixed scroll 11 and is an example of a passage inside the fixed scroll. The second passage 182 flows the refrigerant introduced from the first passage 181 and introduces it into the third passage 183. The third passage 183 may be provided in the main frame 13 to communicate with the chamber 172. The third passage 183 is a passage that passes through the main frame 13 and is an example of a passage inside the holding member. The third passage 183 flows the refrigerant introduced from the second passage 182 and introduces it into the chamber 172. As a result, the pressure within the chamber 172 is maintained at a certain intermediate pressure.

Fig. 14 is a top view of the end of the plate of the orbiting scroll in the compression section of the first modified example of the scroll compressor according to the second embodiment, viewed from above. In other words, Figure 14 is a plan view of the end of the plate 121 of the orbiting scroll 12 seen from above.

The inlet 181a of the first passage 181 is provided in the area 125a (area to the right of the dotted arc) facing the compression chamber 16 in the upper surface area of the plate 121, and the fixed scroll 11 ), an outlet 181b of the first passage 181 is provided in the area 125b (area to the left of the dotted line arc) in contact with the body 111. When the plate 121 is viewed from above, the first passage 181 is not actually visible, but in the drawing, the first passage 181 is indicated by a dotted line to aid understanding. In addition, in the drawing, the inlet 181a of the first passage 181 is provided in an area sandwiched between the two outermost adjacent turning wraps 122, but the inlet 181a is not limited thereto. The location of the inlet 181a of the first passage 181 may be appropriately determined depending on the level of intermediate pressure to be induced into the chamber 172. Accordingly, the refrigerant at the desired intermediate pressure in the compression chamber 16 flows into the first passage 181.

Fig. 15 is a bottom view of the body portion of the fixed scroll in the compression portion of the first modified example of the scroll compressor according to the second embodiment, as seen from below. In other words, FIG. 15 is a bottom view of the body portion 111 of the fixed scroll 11 viewed from below.

An inlet 182a of the second passage 182 is provided in the area 115a (area to the right of the dotted arc) in contact with the plate 121 of the orbiting scroll 12 in the middle of the lower surface area of the body portion 111, An outlet 182b of the second passage 182 is provided in the area 115b (area to the left of the dotted arc) in contact with the main frame 13. In addition, when the body portion 111 of the fixed scroll 11 is viewed from below, the second passage 182 is not actually visible, but in the drawing, the second passage 182 is indicated by a dotted line to facilitate understanding. In addition, in this first modified example, the inlet 182a of the second passage 182 is provided at a point on the orbit 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 rotates. I'm doing it. Accordingly, a specific range of intermediate pressure refrigerant in the compression chamber 16 facing the inlet 181a flows from the first passage 181 to the second passage 182.

Fig. 16 is an axial cross-sectional view of the compression portion and the rotation shaft of the second modification of the scroll compressor according to the second embodiment. In other words, FIG. 16 is an axial cross-sectional view of the compression unit 10 and the rotation shaft 23 according to the second modified example of the scroll compressor 2.

The compression unit 10 according to the second modification of the scroll compressor 2 is the compression unit 10 according to the first modification of the scroll compressor 2 shown in FIG. 13, and includes a first passage 181 and a first passage 181. A counter bore portion 184 is provided between the two passages 182.

The top view of the end of the plate 121 of the orbiting scroll 12 seen from above is the same as the first modified example, so description is omitted.

Fig. 17 is a bottom view of the body portion of the fixed scroll in the compression portion of the second modified example of the scroll compressor according to the second embodiment, as seen from below.

In the lower area of the body 111, an inlet 182a of the second passage 182 is provided in the area 115a (area to the right of the dotted arc) in contact with the plate 121 of the orbiting scroll 12, An outlet 182b of the second passage 182 is provided in the area 115b (area to the left of the dotted arc) in contact with the main frame 13. In addition, when the body portion 111 of the fixed scroll 11 is viewed from below, the second passage 182 is not actually visible, but in the drawing, the second passage 182 is indicated by a dotted line to facilitate understanding. In addition, in this second modified example, the groove portion covering the entire orbit 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 orbits the inlet 182a of the second passage 182 As an example, it is provided to be connected to the count bore unit 184. Accordingly, the medium-pressure refrigerant in the compression chamber 16 facing the inlet 181a always flows from the first passage 181 to the second passage 182.

In addition, in the second modified example, a count beam that covers the entire orbit 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 orbits the inlet 182a of the second passage 182 Although it is provided to connect to the fisherman 184, it is not limited to this. The inlet 182a of the second passage 182 is connected to the counterbore portion 184 that covers a part of the track 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 rotates. It can also be arranged. That is, the inlet 182a of the second passage 182 may communicate with the outlet 181b of the first passage 181 during at least part of the rotation period of the orbiting scroll 12.

In addition, in the first modified example and the second modified example, the first passage 181, which brings out the refrigerant from the compression chamber 16 and introduces it into the second passage 182 in the fixed scroll 11, is connected to the orbiting scroll 12. A second passage 182 is provided within the fixed scroll 11 and introduces the refrigerant introduced from the first passage 181 provided within the orbiting scroll 12 into the third passage 183 within the main frame 13. Although it is assumed that the configuration has been prepared, it is not limited to this. It may be assumed that a passage through which the refrigerant is extracted from the compression chamber 16 and directly introduced into the third passage 183 of the main frame 13 is provided in the fixed scroll 11. If this configuration is assumed, control of the communication timing between the first passage 181 and the second passage 182 mentioned in the first and second modification examples becomes unnecessary.

In addition, in the first modified example and the second modified example, assuming the shapes of the main frame 13 and the sub frame 14 in FIGS. 6, 10, and 12, the main frame 13 and the sub frame 14 By sealing the gap between them with the seal members 172a and 172b, a chamber 172 is formed between the main frame 13 and the subframe 14 to induce intermediate pressure from the compression chamber 16 to the chamber 172. Although it is done, it is not limited to this. For example, assuming the shape of the main frame 13 and the sub-frame 14 in FIG. 11, the gap between the main frame 13 and the sub-frame 14 is sealed with two seal members, so that the main frame ( A chamber may be formed between the subframe 13) and the subframe 14 to induce intermediate pressure from the compression chamber 16 to this chamber.

Alternatively, assuming the shape of the main frame 13 and the subframe 14 of the first embodiment, the chamber 142a of FIGS. 2 to 4 is replaced with the chamber 172 of FIG. 13 or 16 to form a compression chamber ( Intermediate pressure may be induced into the chamber 172 at 16). In addition, the space consisting of the chamber 142a and chamber 121b of FIG. 5 may be referred to as the chamber 172 of FIG. 13 or 16 to induce intermediate pressure from the compression chamber 16 to the chamber 172.

In this sense, compression is achieved by sealing two locations between the main frame 13 and the sub-frame 14 with the seal members 172a and 172b to form a chamber 172 between the main frame 13 and the sub-frame 14. Inducing the intermediate pressure from the chamber 16 to the chamber 172 further expands the gap between the main frame 13 and the sub-frame 14 by sealing at least a portion of the gap between the main frame 13 and the sub-frame 14 with a seal mechanism. It can be understood that an internal space is formed between the frames 14 to induce intermediate pressure from the compression chamber 16 into this internal space.

In the above, specific embodiments are shown and described. However, it is not limited to the above-mentioned embodiments, and those skilled in the art can make various changes without departing from the gist of the technical idea of the invention as set forth in the claims below. .

1, 2: Scroll compressor
11: Fixed scroll
12: Orbiting scroll
121: plate
121a, 121b: chamber
123: body part
123c, 123d: Seal member
13: main frame
131, 132, 133, 134: body part
134g, 134h: Guide member
135, 136: protrusions
14: subframe
141, 142, 143: body part
141c, 141d, 141e, 141f: Seal member
142a: chamber
142c, 142d: Seal member
144: Thrust bearing
15: Oldham Ring
16: Compression chamber
172: Chamber
172a, 172b: Seal member
181: 1st passage
182: Second passage
183: Third passage
184: Countboer Department

Claims (20)

main body;
a fixed scroll fixed inside the main body and having a fixed wrap;
an orbiting scroll provided to orbit with respect to the fixed scroll, the orbiting scroll having a orbiting wrap that forms a compression chamber together with the fixed wrap;
a main frame provided to support the fixed scroll;
a sub-frame disposed inside the main frame to support the orbiting scroll at a position offset from the center of the orbiting scroll;
a gap formed between the main frame and the sub-frame so that the sub-frame can be displaced relative to the main frame;
a seal member sealing the gap between the main frame and the sub-frame so that a chamber is formed between the main frame and the sub-frame; and
A passage provided to guide the refrigerant discharged from the compression chamber to the chamber,
The passage is,
a first passage provided in the orbiting scroll to communicate with the compression chamber;
a second passage provided in the main frame to communicate with the chamber; and
A scroll compressor including; a third passage provided in the fixed scroll to connect the first passage and the second passage. delete According to claim 1,
The orbiting scroll further includes a rotation axis coupled to the orbiting scroll,
The sub-frame is provided to be displaceable relative to the main frame along at least one of a first direction extending along the rotation axis and a second direction orthogonal to the first direction. According to claim 1,
It further includes a rotation shaft inserted into an axis through hole formed in the main frame and coupled to the orbiting scroll so that the orbiting scroll can rotate,
The main frame includes a first body portion having a fixed scroll support surface for supporting the fixed scroll, and a second body portion located below the first body portion and having the shaft through hole,
The sub-frame includes a first body portion located inside the first body portion of the main frame, and a second body portion inserted into the shaft through hole to be located between the rotation axis and the second body portion of the main frame. do,
A scroll compressor in which a gap is formed between the first body portion of the main frame and the first body portion of the sub-frame and between the second body portion of the main frame and the second body portion of the sub-frame. According to claim 4,
The gap between the first body portion of the main frame and the first body portion of the sub-frame is smaller than the gap between the second body portion of the main frame and the second body portion of the sub-frame. According to claim 4,
The sub-frame is provided to be capable of displacement with respect to the main frame,
A scroll compressor in which a protrusion capable of contacting the first body of the sub-frame is formed on an inner surface of the first body of the main frame. According to claim 6,
When the sub-frame is tilted during the displacement process, the protrusion of the main frame and the first body portion of the sub-frame are provided to contact before the second body portion of the main frame and the second body portion of the sub-frame. . According to claim 4,
The sub-frame is provided to be capable of displacement with respect to the main frame,
The sub-frame further includes a thrust bearing located on an upper portion of the first body portion of the sub-frame and having an orbiting scroll support surface for supporting the orbiting scroll,
The thrust bearing is a scroll compressor having a shape capable of elastic deformation. According to claim 1,
It further includes an Oldam Ring provided to prevent rotation of the orbiting scroll,
The Oldham ring is a scroll compressor coupled to the orbiting scroll and the subframe. According to claim 1,
Further comprising an Oldham ring provided to prevent rotation of the orbiting scroll,
The Oldham ring is a scroll compressor coupled to the orbiting scroll and the main frame. According to claim 1,
Further comprising an Oldham ring provided to prevent rotation of the orbiting scroll,
The Oldham ring is a scroll compressor coupled to the orbiting scroll and the fixed scroll. delete delete delete According to claim 1,
The outlet of the first passage forms an orbit according to the orbital movement of the orbiting scroll,
A scroll compressor wherein the inlet of the third passage is located on the orbit. main body;
a fixed scroll fixed inside the main body and having a fixed wrap;
An orbiting scroll provided to orbit with respect to the fixed scroll, the orbiting scroll having a orbiting wrap that forms a compression chamber together with the fixed wrap;
a rotating shaft coupled to the orbiting scroll to rotate;
a main frame provided to support the fixed scroll;
a sub-frame disposed inside the main frame and spaced apart from the main frame;
a gap formed between the main frame and the sub-frame so that the sub-frame can be displaced relative to the main frame;
a seal member sealing the gap between the main frame and the sub-frame so that a chamber is formed between the main frame and the sub-frame; and
A passage provided to guide the refrigerant discharged from the compression chamber into the chamber,
The passage is,
a first passage provided in the orbiting scroll to communicate with the compression chamber;
a second passage provided in the main frame to communicate with the chamber; and
A scroll compressor including; a third passage provided in the fixed scroll to connect the first passage and the second passage. According to claim 16,
The gap between the upper end of the main frame and the upper end of the sub-frame located above in the axial direction of the rotation axis is the gap between the lower end of the main frame and the lower end of the sub-frame located below in the axial direction of the rotation axis. Smaller scroll compressors. According to claim 16,
The rotating shaft is coupled to the orbiting scroll through a shaft through hole formed in the main frame,
The main frame includes a first body portion having a fixed scroll support surface for supporting the fixed scroll, and a second body portion located below the first body portion and having the shaft through hole,
The sub-frame includes a first body portion located inside the first body portion of the main frame, and a second body portion inserted into the shaft through hole to be located between the rotation axis and the second body portion of the main frame. do,
The gap between the first body portion of the main frame and the first body portion of the sub-frame is smaller than the gap between the second body portion of the main frame and the second body portion of the sub-frame. According to claim 16,
The sub-frame is provided to be capable of displacement with respect to the main frame,
A scroll compressor in which a protrusion capable of contacting the sub-frame is formed on an inner surface of the main frame. According to claim 19,
The orbiting scroll includes a plate having a orbiting wrap forming surface on which the orbiting wrap is formed,
The sub-frame includes a first body portion facing the orbiting scroll, and a second body portion located below the first body portion to have a smaller width than the first body portion,
The protrusion is formed to protrude from the inner surface of the main frame so as to be positioned between the orbital wrap forming surface and the upper end of the second body portion of the sub-frame in the axial direction of the rotation shaft.

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