KR20200037730A - Scroll compressor - Google Patents

Abstract

The present invention relates to a scroll compressor capable of optimizing a position where a load is applied to a turning scroll in a support member. The scroll compressor includes: a fixed scroll fixed inside a main body; the turning scroll which is engaged with the fixed scroll and turns; a rotary shaft rotating the turning scroll; a holding member for holding the fixed scroll on the opposite side of the turning scroll; and a support member provided between the rotary shaft and the holding member to support the turning scroll by a load applied to a position deviated from the center of the turning scroll.

Description

Scroll compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor.

The inside of the closed container is maintained at a high pressure, and provided in the closed container, the fixed scroll and the swinging scroll interlocked so that each plate-like vortex tooth forms a compression chamber on each other, and the boss provided on the opposite side of the plate-shaped vortex tooth of the swinging scroll. The main shaft for driving the swinging scroll by inserting the eccentric shaft portion in the section, and the compliant frame for supporting the swinging scroll in the axial direction and at the same time radially supporting the main shaft for driving the swinging scroll in the main shaft section provided on the spindle. A scroll compressor is known that supports a radial frame in a radial direction and has a guide frame fixed to a sealed container, so that the swinging scroll can be moved axially by axial sliding relative to the compliant frame's guide frame (eg For example, see patent literature).

Japanese Patent No. 5641978 (2014.11.07)

Here, when the orbiting scroll is supported by the support member provided between the rotating shaft that orbits the orbiting scroll and the holding member that holds the fixed scroll, the orbiting scroll can be moved in the axial direction by axial sliding with respect to the holding member of the supporting member. Adopting a configuration that makes it impossible to optimize the position where the load is applied from the support member to the orbiting scroll.

It is an object of the invention to optimize the position where a load is applied from the support member to the orbiting scroll.

For this purpose, the present invention provides a fixed scroll fixed in the main body, a rotating scroll intermeshing with the fixed scroll, a rotating shaft for orbiting the rotating scroll, a holding member for holding the fixed scroll on the opposite side of the orbiting scroll, and a rotating shaft and holding A scroll compressor comprising a support member provided between members to support the orbiting scroll by a load applied to a position displaced from the center of the orbiting scroll.

Here, the support member may be provided to be displaceable in one direction with respect to the holding member.

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

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

In this case, the supporting member receives a reaction force from the retaining 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 rotating shaft, so that it can be displaced in a rotational direction opposite to the moment generated by the orbiting scroll. May be In addition, the specific position may be between the end surface of the orbiting scroll side of the rotating shaft bearing of the support member, and the surface of the orbiting side and the fixed scroll of the orbiting scroll support plate.

Alternatively, the support member is opposite to the orbiting scroll for the position where the distance between the orbiting scroll and the holding member on the same side with the smallest distance between the retaining members is the smallest for the position receiving the load on the axis of rotation. In, the gap between the holding members may be narrower than the gap in the narrowest position, and thus may be displaceable in a rotational direction opposite to the moment generated in the orbiting scroll. In addition, the specific position may be between the end surface of the orbiting scroll side of the rotating shaft bearing of the support member, and the surface of the orbiting side and the fixed scroll of the orbiting scroll support plate.

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

In addition, the portion supporting the orbiting scroll of the support member may have a shape that exerts elasticity when the support member is inclined to contact the fixed scroll of the orbiting scroll support plate and a surface that does not mesh with the side.

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

In addition, the scroll compressor may further include a sealing mechanism that forms an inner space between at least a holding member and a supporting member by sealing at least a part of the gap between the holding member and the supporting member.

In addition, the retaining member may be provided with an inner passage of the retaining member for introducing the refrigerant derived from the compression chamber formed by the pivoting of the orbiting scroll with respect to the fixed scroll and turning into the inner space.

In addition, 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 that introduces the refrigerant drawn from the compression chamber into the inner passage of the holding member, and the orbiting scroll has an orbiting scroll inner passage that draws the refrigerant from the compression chamber and introduces it into the fixed scroll inner passage. It may have been done. In this case, the fixed scroll inner passage may be in communication with the orbiting scroll inner passage in at least a portion of the cycle in which the orbiting scroll rotates. And, 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 is turned, and a groove portion covering the entire orbit of the outlet of the orbiting scroll inner passage when the orbiting scroll is turned It may be provided with an inlet connected to.

According to the present invention, it is possible to optimize the position where the load is applied by the orbiting scroll in the support member.

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

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. On the other hand, the terms "tip", "back", "top", "bottom", "top" and "bottom" used in the following description are defined based on the drawings, and the shape of each component by the term And the position is not limited.

This embodiment is provided between the fixed scroll, the orbiting scroll that rotates in engagement with the fixed scroll, the rotating shaft that orbits the orbiting scroll, and the holding member that holds the fixed scroll on the opposite side of the orbiting scroll, and 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 displaced from the center of the orbiting scroll. That is, the support member may be provided to support the orbiting scroll at a position displaced from the center of the orbiting scroll. As a specific configuration for supporting the orbiting scroll by a load applied to a position where the support member is displaced from the center of the orbiting scroll, two configurations may be considered. Hereinafter, these two configurations are described in the first and second embodiments. It is explained as a form.

[First Embodiment]

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

The scroll compressor 1 is a compressor widely used for air conditioners, refrigerators, and pumps. 1 shows a longitudinal sectional view of a hermetic scroll compressor used in a refrigerant circuit of an air conditioner.

The scroll compressor 1 is an example of a main body that houses the compression section 10 for compressing the refrigerant, the driving motor 20 for driving the compression section 10, and the compression section 10 and the driving motor 20. A furnace casing 30 may be included. In addition, the scroll compressor 1 according to the present embodiment is a vertical scroll compressor that is arranged such that the axial direction of the rotation shaft 23 to be described later of the drive motor 20 becomes the gravity direction. Hereinafter, the axial direction of the rotating shaft 23 may be referred to as “up and down direction,” as illustrated in FIG. 1, the upper side may be referred to as “upper side”, and the lower side may be referred to as “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, a rotating scroll 12 engaged with the fixed scroll 11 and turning, and a fixed scroll fixed to the casing 30 ( 11) a main frame 13 provided to hold, 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 orbiting scroll An Oldham ring 15 for turning the orbiting scroll 12 while preventing rotation of the 12 may be included.

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 be formed to 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 protruding portion 113 protruding radially outward from the lower end of the body portion 111. It may include. The fixing wrap 114 protrudes downward from the lower end of the plate 112 and may be formed in a vortex shape when viewed from the bottom.

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

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

A through hole 112a may be formed in the vertical direction of the central portion of the plate 112. The through hole 112a functions as a discharge port for discharging the 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 may be fixed to the main frame 13 by using fastening members such as bolts or positioning pins penetrating the installation hole formed in the vertical direction on the protrusion 113.

The orbiting scroll 12 may include an orbiting scroll body and an orbiting wrap 122 that protrudes from the orbiting scroll body to mesh with the stationary wrap 114 of the stationary scroll 11 to form a compression chamber 16. have. The orbiting wrap 122 may protrude upward from the orbiting scroll body.

The orbiting scroll 12 is coupled to the rotating shaft 23 and can orbit.

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 turning 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 can be exemplified by an FC material or an FCD material.

The orbiting wrap 122 of the orbiting scroll 12 may engage the stationary wrap 114 of the orbiting scroll 11. And, the orbiting wrap 122 of the orbiting scroll 12 and the stationary wrap 114 of the orbiting scroll 11 are between the body portion 111, the plate 112 and the plate 121 of the orbiting scroll 11. Arranged in the formed space, the compression chamber 16 can be partitioned. The refrigerant is compressed by reducing the volume of the compression chamber 16 by orbiting the rotating wrap 122 with respect to the fixed fixing wrap 114. 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.

The body portion 123 is fitted with an eccentric shaft 232, which will be described later, of the rotating shaft 23 in a state in which a sliding bearing is interposed. As such, 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 radially inner side of the lower end of the first body portion 131, and a second The cylindrical third body portion 133 protruding radially from the lower end of the body portion 132, and the cylindrical fourth body portion protruding upward and downward from the inner end of the third body portion 133 ( 134). In addition, the main frame 13 is fixed to the outer circumferential surface of the first body portion 131 to the center casing 31 to be described later of the casing 30. In addition, a rotating shaft 23, which will be described later, of the driving motor 20 is fitted inside the fourth body portion 134 with the journal bearing interposed. As such, 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 protruding upward from the upper end. A female screw is formed in the protruding portion 131a, and a bolt through the installation hole formed in the protruding portion 113 of the fixed scroll 11 is fastened to the female screw, whereby the fixed scroll 11 is installed in the main frame 13. .

In addition, a groove 131b extending in the vertical direction may be formed on the outer circumferential surface of the first body portion 131. That is, a groove 131b extending in the vertical direction from the center of the outer circumferential portion to the lower portion may be formed in the first body portion 131. In the first body portion 131, a portion in which the groove 131b is formed may be spaced apart from the central casing 31.

On the inner circumference of the fourth body portion 134, a rotary shaft 23 is fitted with a journal bearing interposed, so that the fourth body portion 134 functions as a bearing that rotatably supports the rotary shaft 23.

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

The sub frame 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 is displaceable relative to the main frame 13. In other words, the sub-frame 14 may be disposed inside the main frame 13 to be spaced from the main frame 13.

The sub-frame 14 may include a cylindrical first body portion 141 and a cylindrical second body portion 142 protruding downward from a lower end surface of the first body portion 141. And, the sub-frame 14, 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 circumferential surfaces of the fourth body portion 134 of 13), the sub-frame 14 and the orbiting scroll 12 are spaced apart such that they can be displaced only in the axial direction of the rotating shaft 23 with respect to the main frame 13 It is arranged in a space surrounded by the main frame 13.

In addition, the 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 and the sub frame of the main frame 13 A first concave portion 141a and a second concave portion 141b concave downward from an upper end surface are formed in a portion made of the first body portion 141 of (14). In the radial direction, the first recess 141a is formed in the center, and the second recess 141b is formed between the first recess 141a and the protrusion 131a. Then, the body portion 123 of the orbiting scroll 12 is inserted into the first recess 141a. The second recess 141b is disposed between the main frame 13 and the orbiting scroll 12, and an old ring 15 for preventing the orbiting of the orbiting scroll 12 is disposed.

In addition, a discharge passage (not shown) for discharging the refrigerant compressed in the compression chamber 16 is formed in the compression unit 10 described above. The discharge passage for discharging the high-pressure refrigerant among the discharge passages is provided in the through hole 112a of the plate 112 for discharging the refrigerant in a space including the high-pressure refrigerant surrounded by the fixed scroll 11 and the orbiting scroll 12. Connected, the other end is connected to the space below the main frame 13 in the casing 30, and is also connected to the chamber 121a. In addition, the discharge passage for discharging the medium-pressure refrigerant among the discharge passages is connected to an outlet (not shown) for discharging the refrigerant in a space including a medium-pressure refrigerant surrounded by a fixed scroll 11 and a turning scroll 12 at one end. And the other end is connected to the chambers 121b and 142a.

Next, the driving motor 20 will be described.

The driving motor 20 is fixed to the casing 30 under 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 supporting the rotor 22 and rotating relative to the casing 30, and a rotating shaft It may include a support member 24 for rotatably supporting (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 stacked body in which a number of electromagnetic steel plates are stacked, and has a substantially cylindrical shape. In addition, the outer circumferential surface diameter of the stator body 211 is formed larger than the inner circumferential surface diameter of the central casing 31 to be described later of the casing 30, so that the stator body 211 (stator 21) is attached to the central casing 31. It is fitted with a forced fit. As a method of fitting the stator body 211 to the central casing 31, a shrink fit or a press fit can be exemplified.

In addition, the stator 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 the present embodiment, the coil 212 may be exemplified by a concentration zone inserted among slots existing between a plurality of adjacent teeth.

The rotor 22 is a stacked body in which a large number of ring-shaped electromagnetic steel plates are stacked, and has a cylindrical shape as a whole. And, the inner circumferential surface diameter of the rotor 22 is formed smaller than the outer circumferential surface diameter of the rotating shaft 23, and the rotating shaft 23 is fitted to the rotor 22 by interference fit. As a method of fitting the rotating shaft 23 to the rotor 22, press-fitting is exemplified. Then, the rotor 22 is fixed to the rotating shaft 23 and rotates together with the rotating shaft 23. In addition, the rotor 22 may be illustrated as an example in which a permanent magnet is embedded therein.

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

The rotating shaft 23 may include a main shaft 231 into which the rotor 22 is fitted, and an eccentric shaft 232 provided on an upper portion of the main shaft 231 and having an axial center eccentric from the axis center of the main shaft 231. have.

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

Further, a through hole 233 penetrating the rotation shaft 23 in the axial direction is formed in the rotation shaft 23. In addition, a first communication hole 234 communicating the bearing of the through-hole 233 and the support member 24 to the rotating shaft 23, and a second communicating hole of the through-hole 233 and the main frame 13 The communication hole 235 and the third communication hole 236 communicating the through hole 233 and the bearing of the body portion 123 are formed in a 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. Then, the support member 24 is fixed to the central casing 31 such that the outer circumferential surface of the first body portion 241 faces the inner circumferential surface of the central casing 31 to be described later. In addition, the rotation shaft 23 is fitted in the state in which the journal bearing is interposed inside the first body portion 241 and the second body portion 242. Therefore, the support member 24 functions as a bearing that rotatably supports the rotating shaft 23.

In addition, a hole (not shown) and a groove (not shown) communicating the space above and below the first body part 241 are formed in the first body part 241.

A pump 243 for pumping up lubricating oil is mounted at a 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 portion covering the lower opening of the central casing 31. It may include a casing (33). In addition, the casing 30 includes a discharge section 34 for discharging the high-pressure refrigerant compressed by the compression section 10 to the outside of the casing 30, and a suction section for sucking refrigerant from the outside of the casing 30 ( 35) may be further included.

As described above, the main frame 13 of the compression section 10, the stator 21 of the drive motor 20, and the support member 24 are fixed to the central casing 31. In addition, the discharge part 34 and the suction part 35 are configured by inserting a tube into a through hole formed in the central casing 31. The suction part 35 is also provided at a position corresponding to the through hole 111a formed in the body part 111 of the fixed scroll 11, so that the fixed scroll 11 and the orbiting scroll (from the outside of the casing 30) 12) The refrigerant is sucked into the space enclosed.

The lower casing 33 is formed in a bowl shape, so that it is possible to collect lubricant.

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

When the driving motor 20 of the scroll compressor 1 is driven, the rotating shaft 23 rotates and the orbiting scroll 12 fitted to the eccentric shaft 232 of the rotating shaft 23 rotates relative to the fixed scroll 11. . As the orbiting scroll 12 rotates relative to the fixed scroll 11, the refrigerant of low pressure is sucked from the outside of the casing 30 through the suction part 35 into the space surrounded by the fixed scroll 11 and the orbiting scroll 12 do. Then, the refrigerant is compressed according to the volume change of the compression chamber 16. The high-pressure refrigerant compressed in the compression chamber 16 flows out below the compression unit 10.

The high-pressure refrigerant discharged downward from the compression part 10 is discharged to the outside of the casing 30 through the discharge part 34 provided in the casing 30. In addition, the refrigerant passes through the gap between the rotor 22 and the stator 21 or the gap between the stator 21 and the central casing 31 in the process of being discharged to the outside of the casing 30. Then, the high-pressure refrigerant discharged to the outside of the casing 30 is sucked back from the suction unit 35 after each stroke of condensation, expansion, and evaporation in the refrigerant circuit.

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 elevated lubricating oil is supplied to each bearing of the rotating shaft 23 through the first communicating hole 234, the second communicating hole 235, and the third communicating hole 236 formed in the rotating shaft 23, or the compression part ( 10) is supplied to the sliding portion. In addition, the lubricant supplied to the sliding portion 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 gap between the groove 131b, the rotor 22 and the stator 21, the axial hole formed in the support member 24, and collects it at the lower portion of the casing 30. In this process and in the process of passing the gap between the rotor 22 and the stator 21 before the high-pressure refrigerant is discharged to the outside of the casing 30, the lubricant and the refrigerant flow to the low pressure side while cooling the drive motor 20. do. The lubricating oil flowing together with the high-pressure refrigerant is then separated from the refrigerant and collected in the lower portion 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 a space surrounded by the orbiting scroll 12 and the main frame 13.

In a general scroll compressor, the sub-frame 14 is not disposed, so that the moment load received by the orbiting scroll 12 from the refrigerant sucked from the intake part 35 is the upper thrust load and orbit of the fixed scroll 11. It 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 in the drawing, the moment load F _M received by the orbiting scroll 12 from the refrigerant sucked by the suction unit 35 as the main, and the fixed scroll 11 The upper surface thrust reaction force F _U and the lower surface thrust in the subframe 14 are offset by the thrust reaction force F _L.

In this case, since the distance from the action point of the upper surface thrust reaction force F _{U to} the action point of the thrust reaction force F _L increases, the lower surface thrust reaction force F _L may be smaller than the back load of a typical scroll compressor. Moreover, the upper surface thrust reaction force F _U may also be small. Therefore, the scroll compressor 1 according to the present embodiment improves efficiency by reducing friction loss between the fixed scroll 11 and the orbiting scroll 12, and the top surface of the plate 121 of the orbiting scroll 12 and The lower surface improves reliability by reducing the load on the sliding part.

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

2 is an axial cross-sectional view of a compression unit and a rotating shaft in 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 has a fixed scroll 11, an orbiting scroll 12, a main frame 13, and a sub frame 14 as in FIG. , Oldham ring 15 may be included. Further, seal members 123c and 123d are provided in the body portion 123 of the orbiting scroll 12 to seal the gap between 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, by providing such seal members 123c and 123d, the inside of the chamber 121a is maintained at a high pressure. In addition, the space between the first body portion 131 of the main frame 13 and the first body portion 141 of the sub-frame 14 (first space between the sub-frame 14 and the main frame 13) ) As an example of the first seal member for sealing, the seal members 141c and 141d are provided, and at the same time, the fourth body part 134 of the main frame 13 in the second body part 142 of the subframe 14 Seal members 142c and 142d are provided as an example of the second seal member that seals the gap between the (second gap between the subframe 14 and the main frame 13). In this first modification, by providing the seal members 141c, 141d, 142c, and 142d, the pressure in the chamber 142a is maintained at a specific intermediate pressure.

In addition, in the first modified example, seal members 141c, 141d, 142c, and 142d that seal the gap between the subframe 14 and the main frame 13 are provided. However, it may be understood that this is further enlarged to provide a seal mechanism for sealing the gap between the sub-frame 14 and at least one member facing the sub-frame 14.

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

The compression unit 10 according to the second modification of the scroll compressor 1 is the outer diameter of the sub-frame 14 in the compression unit 10 according to the first modification of the scroll compressor 1 shown in FIG. 2. Is to maximize. The old ring 15 is moved radially inward to move the position where the first body portion 141 of the subframe 14 supports the orbiting scroll 12 radially outward. In this second modified example, since the distance from the point of action of the upper surface thrust reaction force to the point of action of the thrust reaction force is maximum, the upper surface thrust reaction force and the lower surface thrust reaction force are minimum.

4 is an axial cross-sectional view of a compression unit and a rotating shaft in a third modified example of the scroll compressor according to the first embodiment.

The compression unit 10 according to the third modification example of the scroll compressor 1 is provided in the compression unit 10 according to the second modification example of the scroll compressor 1 shown in FIG. 3. 4 It is provided with a guide member (134g, 134h) in the body portion (134). Here, rails can be exemplified as the guide members 134g and 134h. In addition, the wheels rolling over the rails may be provided on the subframe 14 as a guide member. In this third modified example, by providing the guiding members 134g, 134h in the fourth body portion 134 of the main frame 13, the sub-frame 14 is not inclined and the rotating shaft 23 with respect to the main frame 13 ) In the axial direction.

5 is an axial cross-sectional view of a compression unit and a rotating shaft in a fourth modified example of the scroll compressor according to the first embodiment.

The compression unit 10 according to the fourth modification of the scroll compressor 1 is provided in 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 sealing the gap between the fourth body portion 134 of the main frame 13 and the second body portion 142, the first body portion of the sub-frame 14 The seal member 141e, 141f is provided as an example of the 3rd seal member which seals the space | interval between the plate 121 of the orbiting scroll 12 in (141). In this fourth modification, by providing the seal members 141c, 141d, 141e, and 141f, the refrigerant in the chamber 142a is also introduced into the chamber 121b so that the pressure in the chamber 121b is equal to the pressure in the chamber 142a. It is maintained at a certain intermediate pressure.

Further, in the fourth modified example, the sealing member 141c, 141d sealing the gap between the subframe 14 and the main frame 13, and the gap between the subframe 14 and the orbiting scroll 12 are sealed. Seal members 141e and 141f were provided. However, it can be understood that this is wider to provide a seal mechanism that seals the gap between the sub-frame 14 and at least one member facing the sub-frame 14.

As described above, in the present embodiment, the orbiting scroll 12 so as to be displaceable only in the axial direction of the orbiting scroll 23 relative to the main frame 13 in a space surrounded by the orbiting scroll 12 and the rotating shaft 23 and the main frame 13 ), A sub-frame 14 was provided. Accordingly, the pressure applied to the orbiting scroll 12 in the sub-frame 14 is equalized regardless of the place, and the thrust load for stabilizing the orbiting scroll 12 is reduced to improve the efficiency and reliability of the scroll compressor 1. I was able to improve it.

Further, in the present embodiment, the subframe 14 can be displaced only in the direction along the rotation axis 23 with respect to the main frame 13. However, the sub-frame 14 does not move at all other than the displacement in the direction along the rotation axis 23 relative to the main frame 13. In addition to the displacement in the direction along the rotation axis 23, among rotations around the rotation axis 23, displacements in the direction along the axis perpendicular to the rotation axis 23, and rotations around an axis perpendicular to the rotation axis 23 If even rotation around an axis perpendicular to the axis of rotation 23 is not possible, other displacement or rotation may be possible. It can be understood that this is made wider so that the sub-frame 14 can be displaced in the direction along the rotation axis 23 relative to the main frame 13. It is also understood that the sub-frame 14 is displaceable in one direction relative to the main frame 13.

[Second Embodiment]

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. 6 shows a longitudinal cross-sectional view of the hermetic scroll compressor used in the refrigerant circuit of the air conditioner.

The scroll compressor 2 is an example of a main body that houses the compression unit 10 for compressing the refrigerant, the driving motor 20 for driving the compression unit 10, and the compression unit 10 and the driving motor 20. A furnace casing 30 may be included. Further, the scroll compressor 2 according to the present embodiment is a vertical scroll compressor which is arranged such that the axial direction of the rotation shaft 23 to be described later of the drive motor 20 becomes the gravity direction. Hereinafter, the axial direction of the rotating shaft 23 may be referred to as “up and down direction,” as illustrated in FIG. 6, the upper side may be referred to as “upper side”, and the lower side may be referred to as “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, a rotating scroll 12 engaged with the fixed scroll 11 and turning, and a fixed scroll fixed to the casing 30 ( 11) a main frame 13 provided to hold, a sub-frame 14 disposed between the rotating shaft 23 and the main frame 13 to be described later and provided to support the orbiting scroll 12, and the orbiting scroll ( It may include an old ring (15) for turning 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 be formed to 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 protruding radially outward from the lower end of the body portion 111. It can contain. 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 the bottom.

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

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

A through hole 112a may be formed in the vertical direction of the central portion of the plate 112. The through hole 112a functions as a discharge port for discharging the 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 may be fixed to the main frame 13 by using fastening members such as bolts and positioning pins penetrating the installation hole formed in the vertical direction on the protrusion 113.

The orbiting scroll 12 may include an orbiting scroll body and an orbiting wrap 122 that protrudes from the orbiting scroll body to mesh with the stationary wrap 114 of the stationary scroll 11 to form a compression chamber 16. have. The orbiting wrap 122 may 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 turning wrap 122 may protrude upward from the upper end of the plate 121 and may be formed in a vortex shape when viewed from above.

The material of the orbiting scroll 12 can be exemplified by an FC material or an FCD material.

The orbiting wrap 122 of the orbiting scroll 12 may engage the stationary wrap 114 of the orbiting scroll 11. And, the orbiting wrap 122 of the orbiting scroll 12 and the stationary wrap 114 of the orbiting scroll 11 are between the body portion 111, the plate 112 and the plate 121 of the orbiting scroll 11. Arranged in the formed space, the compression chamber 16 can be partitioned. Then, by rotating the orbiting wrap 122 with respect to the fixed or fixed wrap 114, the volume of the compression chamber 16 is reduced to compress the refrigerant. 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.

The body portion 123 is fitted with an eccentric shaft 232, which will be described later, of the rotating shaft 23 in a state in which a sliding bearing is interposed. 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 radially inner side of the lower end of the first body portion 131, and a second A third body portion 133 having a cylindrical shape protruding radially from the lower end of the body portion 132 may be included. A shaft through hole 133a into which the rotation shaft 23 is inserted may be formed in the third body portion 133. In addition, the main frame 13 is fixed to the outer circumferential surface of the first body portion 131 to the center casing 31 to be described later of the casing 30. In addition, in the second embodiment, unlike the first embodiment, the main frame 13 does not support the rotating shaft 23 to be described later of the drive motor 20.

The outer peripheral portion of the first body portion 131 is provided with a protruding portion 131a protruding upward from the upper end. A female screw is formed in the protruding portion 131a, and a bolt through the installation hole formed in the protruding portion 113 of the fixed scroll 11 is fastened to the female screw, whereby the fixed scroll 11 is installed in the main frame 13. .

In addition, a groove 131b extending in the vertical direction may be formed on the outer circumferential surface of the first body portion 131. That is, the first body portion 131 may be formed with a groove 131b extending in the vertical direction from the center to the bottom of the outer peripheral portion. In the first body portion 131, a portion in which 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 supporting the fixed scroll 11. The fixed scroll support surface 11a may be formed on the protrusion 131a.

The sub frame 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 is displaceable relative to the main frame 13. In other words, the sub-frame 14 may be disposed inside the main frame 13 to be spaced from the main frame 13.

The sub-frame 14 includes a cylindrical first body portion 141, a cylindrical second body portion 142 protruding downward from a 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 circumferential surface of the third body portion 143 may be smaller than the width of the inner circumferential surface of the first body portion 141 and the width of the inner circumferential surface of the second body portion 142. The third body portion 143 may be inserted into the shaft through-hole 133a so as to be positioned between the rotating shaft 23 and the third body portion 133 of the main frame 13. In addition, a rotating shaft 23, which will be described later, of the driving motor 20 is fitted inside the third body portion 143 with the journal bearing interposed. Therefore, the sub-frame 14 also functions as a bearing that rotatably supports the rotating shaft 23. The sub frame 14 may be provided to be displaceable with respect to the main frame 13 along at least one of an axial direction of the rotating shaft 23 and a direction orthogonal to the axial direction of the rotating shaft 23. In another aspect, the sub-frame 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 outer peripheral surface of the third body portion 143 Between the inner circumferential surfaces of the third body portion 133 of the main frame 13, the sub-frame 14 is displaceable in the axial direction of the rotating shaft 23 relative to the main frame 13, and is also approximately on the rotating shaft 23. It is arranged between the rotating shaft 23 and the main frame 13 with a space of a degree that can be displaced in a rotational direction around an orthogonal virtual axis.

In addition, the 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 and the sub frame of the main frame 13 The first concave portion 141a and the second concave portion 141b, which are concave downward from the upper end surface, are formed in the portion of the first body portion 141 of (14). In the radial direction, the first recess 141a is formed in the center, and the second recess 141b is formed between the first recess 141a and the protrusion 131a. Then, the body portion 123 of the orbiting scroll 12 is inserted into the first recess 141a. The second recess 141b is disposed between the main frame 13 and the orbiting scroll 12, and an old ring 15 for preventing the orbiting of the orbiting scroll 12 is disposed.

In addition, a discharge passage (not shown) for discharging the refrigerant compressed in the compression chamber 16 is formed in the compression unit 10 described above. The discharge passage for discharging the high-pressure refrigerant among the discharge passages is provided in the through hole 112a of the plate 112 for discharging the refrigerant in a space including the high-pressure refrigerant surrounded by the fixed scroll 11 and the orbiting scroll 12. Connected, the other end is connected to the space below the main frame 13 in the casing 30, and further to the chamber 121a. In addition, the discharge passage for discharging the medium-pressure refrigerant among the discharge passages is connected to an outlet (not shown) for discharging the refrigerant in a space including a medium-pressure refrigerant surrounded by a fixed scroll 11 and a turning scroll 12 at one end. And the other end is connected to the chambers 121b and 142a.

Since the driving motor 20 and the casing 30 are the same as those described in the first embodiment, descriptions thereof are omitted here.

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

On the other hand, in such a scroll compressor 2, the orbiting scroll 12 is intended to be inclined under a compressed load of gas.

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

7B is a view showing a shape in which the orbiting scroll is to be inclined. Specifically, FIG. 7B is a view showing a state in which the orbiting scroll 12 is about to be tilted when viewed from the viewpoint A of FIG. 7A. As shown in FIG. 7B, the orbiting scroll 12 is subjected to a compressive load F _t to generate a moment load in the clockwise direction and attempts to tilt.

On the other hand, the sub frame 14 receives a lateral load from the axis, and thus tries to move in the load direction.

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

The position supporting the lateral load F _MJ on the axis is assumed to be opposite to the orbiting scroll 12 with respect to the lateral load F _MJ , as shown in FIG. 8. That is, it is assumed that, for example, when the protrusion 135 of the main frame 13 contacts the sub frame 14, the reaction force R _{MJ acting} on the sub frame 14 has occurred at the position shown in FIG. Then, the moment M _F acting on the sub-frame 14 becomes the same clockwise as the moment M _S acting on the orbiting scroll 12, so that the tilting of the orbiting scroll 12 cannot be effectively suppressed.

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

9 is an axial cross-sectional view of a compression unit and a rotating shaft of a scroll compressor when a moment operating in a subframe becomes opposite to a moment operating in a turning scroll.

In this embodiment, as shown in Fig. 9, the subframe 14 is structured to be supported on the same side as the orbiting scroll 12 with respect to the lateral load F _MJ on the axis. That is, for example, when the protrusion 136 formed on the inner surface of the main frame 13 contacts the sub frame 14, the reaction force R _{MJ acting} on the sub frame 14 is generated at the position shown in FIG. Accordingly, the moment M _F in the counterclockwise direction is generated in the sub-frame 14 to effectively suppress the inclination of the orbiting scroll 12. This is an example of allowing the reaction force in the holding member against the load received by the orbiting scroll to be received at a specific position on the orbiting scroll side rather than the position receiving the load on the rotating shaft. Here, the position generating the reaction force R _MJ operating in the sub-frame 14 may be a position between L1 and L2 of FIG. 9. L1 is the position of the end face of the orbiting scroll 12 side of the third body portion 143 of the subframe 14. When the cross section is inclined, it may be the lowest position of the end face. L1 is an example of the position of the end face on the orbiting scroll side of the rotating shaft bearing of the support member. In addition, L2 is the position of the surface where 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 the 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. When this surface is inclined, it may be the top position of the surface. L2 is an example of the surface position of the side which meshes with the fixed scroll of the orbiting scroll support plate.

In addition, in order to generate the reaction force R _{MJ acting} on the subframe 14 at the position shown in FIG. 9, when the orbiting scroll 12 is about to be tilted, the first body portion 131 and the sub of the main frame 13 The first body portion 141 of the frame 14 may have a structure that contacts the third body portion 133 of the main frame 13 and the third body portion 143 of the sub-frame 14. That is, when the sub-frame 14 is inclined during the displacement process, the protruding portion 136 of the main frame 13 and the first body portion 141 of the sub-frame 14 are the third body portion of the main frame 13 The third body part 143 of the 133 and the sub-frame 14 may be contacted earlier. More specifically, the first body portion 131 and the subframe of the main frame 13 when the thrust surface supporting the orbiting scroll 12 of the subframe 14 is approximately parallel to the thrust surface of the fixed scroll 11 The first cylindrical portion 141 of 14 may have a structure in contact with the third body portion 133 of the main frame 13 and the third body portion 143 of the subframe 14.

To this end, the distance between the first body portion 131 of the main frame 13 and the first body portion 141 of the sub frame 14 is the third body portion 133 and the sub frame of the main frame 13 It is sufficient to make it narrower than the distance between the third body parts 143 of (14). This is the distance between the orbiting scroll and the holding member on the same side with respect to the position receiving the load on the rotating shaft, and the specific position with the narrowest distance between the holding scroll and the holding member on the opposite side to the orbiting scroll with respect to the location receiving the load on the rotating shaft. It is an example of making the distance between the narrower and the narrower than that of the narrow position. Here, the space between the first body portion 131 of the main frame 13 and the first body portion 141 of the sub frame 14 may be a location between L1 and L2 in FIG. 9. L1 is the position of the end face of the orbiting scroll 12 side of the third body portion 143 of the subframe 14. In addition, when this end face is inclined, it may be located at the bottom of the end face. L1 is an example of the position of the end face on the orbiting scroll side of the rotating shaft bearing of the support member. In addition, L2 is the position of the surface where the orbiting wrap 122 of the plate 121 of the orbiting scroll 12 is formed. When this surface is inclined, you may make it the position of the uppermost side of the surface. L2 is an example of the surface position of the side which meshes with the fixed scroll of the orbiting scroll support plate.

In addition, in the present embodiment, as shown in FIG. 9, the sub-frame 14 may include a thrust bearing 144 having an orbiting scroll support surface 144a supporting the orbiting scroll 12. have. The thrust bearing 144 may have a shape capable of elastic deformation. Specifically, the thrust bearing 144 of the sub-frame 14, the outer circumferential side of the thrust bearing 144 of the sub-frame 14, the orbiting scroll 12 is inclined so that the orbiting wrap 122 is not formed It may have a shape that exerts elasticity when it is in contact with one surface of the scroll 12. Through this, the thrust load is distributed to suppress local contact. Here, the shape of the thrust bearing 144 shown in Fig. 9 is only an example, and any shape may be used as long as it can exhibit elasticity. The thrust bearing 144 is an example of a portion supporting the orbiting scroll of the support member, and the shape of the thrust bearing 144 of FIG. 9 is on the side that does not engage with the fixed scroll of the orbiting scroll support plate due to the inclination of the orbiting scroll. It is an example of a shape that exhibits elasticity when in contact with a surface.

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

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

The compression unit 10 according to the first mounting example of the scroll compressor 2 has a fixed scroll 11, an orbiting scroll 12, a main frame 13, and a sub frame 14 as in FIG. , Oldham ring 15 may be included. And in this first mounting example, the Oldham ring 15 is coupled or engaged to the orbiting scroll 12 and the subframe 14. Specifically, two or one pair of Oldham ring guide grooves 121g are formed on the lower surface of the plate 121 of the orbiting scroll 12 on a substantially straight line. In each Oldham ring guide groove (121g), two or one pair of key portions (15b) formed on the upper surface of the ring portion (15a) of the Oldham ring (15) are coupled or engaged so as to be reciprocally sliding. In addition, on the upper surface of the first body portion 141 of the sub-frame 14, the two or one pair of Oldham ring guide grooves 141g having a phase difference of approximately 90 ° with the Oldham ring guide grooves 121g of the orbiting scroll 12 ) Is formed on a substantially straight line. Two or one pair of key portions 15c formed on the lower surface of the ring portion 15a of the Oldham ring 15 are coupled or engaged to each Oldham ring guide groove 141g so as to be reciprocally slidable. The orbiting scroll 12 is configured by the Oldham ring 15 configured as described above, so that the orbiting movement can be performed without rotating.

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

The compression unit 10 according to the second mounting example of the scroll compressor 2 has a fixed scroll 11, an orbiting scroll 12, a main frame 13, and a sub frame 14 as in FIG. , Oldham ring 15 may be included. And in this second mounting example, the Oldham ring 15 is engaged or engaged with the orbiting scroll 12 and the main frame 13. Specifically, two or one pair of Oldham ring guide grooves 121g are formed on the lower surface of the plate 121 of the orbiting scroll 12 on a substantially straight line. In each Oldham ring guide groove (121g), two or one pair of key portions (15b) formed on the upper surface of the ring portion (15a) of the Oldham ring (15) are coupled or engaged so as to be reciprocally sliding. In addition, on the upper surface of the first body portion 131 of the main frame 13, the two or one pair of Oldham ring guide grooves 131g having a phase difference of approximately 90 ° with the Oldham ring guide grooves 121g of the orbiting scroll 12 ) Is formed on a substantially straight line. Two or one pair of key portions 15d formed on the lower surface of the ring portion 15a of the Oldham ring 15 are coupled or engaged to each Oldham ring guide groove 131g so as to be reciprocally slidable. The orbiting scroll 12 is configured by the Oldham ring 15 configured as described above, so that the orbiting movement can be performed without rotating.

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

The compression unit 10 according to the third mounting example of the scroll compressor 2 has a fixed scroll 11, an orbiting scroll 12, a main frame 13, and a sub frame 14 as in FIG. , Oldham ring 15 may be included. In the third mounting example, the Oldham ring 15 is engaged or engaged with the orbiting scroll 12 and the fixed scroll 11. Specifically, two or one pair of Oldham ring guide grooves 121g are formed on the lower surface of the plate 121 of the orbiting scroll 12 on a substantially straight line. In each Oldham ring guide groove (121g), two or one pair of key portions (15b) formed on the upper surface of the ring portion (15a) of the Oldham ring (15) are coupled or engaged so as to be reciprocally sliding. 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 ° from the Oldham ring guide grooves 121g of the orbiting scroll 12 are approximately It is formed on a straight line. Two or one pair of key portions 15e formed on the upper surface of the ring portion 15a of the Oldham ring 15 are coupled or engaged to each Oldham ring guide groove 112g so as to be reciprocally slidable. The orbiting scroll 12 is configured by the Oldham ring 15 configured as described above, so that the orbiting movement can be performed without rotating.

However, in a configuration in which the sub-frame 14 supporting the orbiting scroll 12 can be displaced only in the direction along the rotation axis 23, the moment acting on the sub-frame 14 is not controlled and follows the trend. Becomes If this is done, the thrust reaction force cannot be effectively positioned, and the effect is not exerted. On the other hand, in this embodiment, the thrust reaction force can be determined as the ideal position, so that the effect can be maximized.

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. . The sub-frame 14 can be pushed to the orbiting scroll 12 by guiding a specific pressure (medium pressure) from the compression chamber 16 during the compression stroke to this space. There may be mainly two methods for realizing this, and the first modification example and the second modification example will be described in detail below.

13 is an axial cross-sectional view of a compression unit and a rotating shaft in a 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 rotating shaft 23 according to the first modification of the scroll compressor 2.

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

And, the compression unit 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, by providing the seal member 171a, the chamber 171 is formed, and the inside of the chamber 171 is maintained at a high pressure.

Further, in the compression unit 10, a seal member 172a sealing 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) may be provided. A seal member 172a sealing the gap between the second body portion 132 of the main frame 13 and the first body portion 141 of the sub frame 14 is provided, and at the same time, the main frame 13 is made of A seal member 172b is provided to seal the gap between the third body portion 133 and the third body portion 143 of the sub frame 14. These seal members 172a and 172b correspond to the two seal members described above. In this first modified example, the chambers 172 are formed by providing the seal members 172a and 172b.

Further, in the compression unit 10, passages 181, 182, and 183 may be provided to guide the refrigerant discharged from the compression chamber 16 to the chamber 172. Specifically, the compression unit 10 has a first passage 181, a second passage 182, and a third passage 183 for guiding a refrigerant of a specific pressure from the compression chamber 16 to the chamber 172. It is prepared. The first passage 181 may be provided on the orbiting scroll 12 to communicate with the compression chamber 16. The first passage 181 is a passage passing through the orbiting scroll 12 and is an example of the orbiting scroll inner passage. The first passage 181 draws and flows the refrigerant from the compression chamber 16 and introduces the refrigerant into the second passage 182. The second passage 182 may be provided on the fixed scroll 11 to connect the first passage 181 and the third passage 183. The second passage 182 is a passage through the fixed scroll 11 and is an example of the fixed scroll internal passage. 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 through the main frame 13 and is an example of the passage inside the holding member. The third passage 183 flows the refrigerant introduced from the second passage 182 to introduce it into the chamber 172. Due to this, the pressure in the chamber 172 is maintained at a certain intermediate pressure.

14 is a top view of an end portion 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, as viewed from above. In other words, FIG. 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 (the area on the right side of the arc of the dotted line) facing the compression chamber 16 in the upper surface area of the plate 121, and the fixed scroll 11 ), The outlet 181b of the first passage 181 is provided in the region 125b (the region on the left side of the arc of the dotted line) that is in contact with the body portion 111. When the plate 121 is viewed from the top, the first passage 181 is not actually visible, but in the drawing, the first passage 181 is indicated by a dotted line for better understanding. In addition, in the drawing, the inlet 181a of the first passage 181 is provided in the region sandwiched by the two outermost orbiting wraps 122, but is not limited thereto. The position at which the inlet 181a of the first passage 181 is provided may be appropriately determined according to the size of the intermediate pressure to be induced into the chamber 172. Therefore, the desired medium pressure refrigerant in the compression chamber 16 flows into the first passage 181.

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

At the same time, the inlet 182a of the second passage 182 is provided in the region 115a (the right region of the dotted circular arc) that is in contact with the plate 121 of the orbiting scroll 12 in the middle of the lower surface region of the body portion 111, The outlet 182b of the second passage 182 is provided in the region 115b (the region on the left side of the dotted circular arc) in contact with the main frame 13. Further, 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 shown as a dotted line for better understanding. In addition, in this first modified example, the inlet 182a of the second passage 182 is provided at one point on the track 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 pivots. Doing. Therefore, a certain 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.

16 is an axial cross-sectional view of a compression unit and a rotating shaft in a second modified example 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 rotating shaft 23 according to the second modification of the scroll compressor 2.

The compression unit 10 according to the second modification of the scroll compressor 2 is provided in the compression unit 10 according to the first modification of the scroll compressor 2 shown in FIG. A count 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 that of the first modified example, and thus description is omitted.

17 is a bottom view of the fixed scroll body according to the second modified example of the scroll compressor according to the second embodiment, as viewed from below.

In the lower region of the body portion 111, the inlet 182a of the second passage 182 is provided in the region 115a (the right region of the dotted circular arc) in contact with the plate 121 of the orbiting scroll 12, The outlet 182b of the second passage 182 is provided in the area 115b (the area to the left of the dotted arc) that is in contact with the main frame 13. Further, 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 shown as a dotted line for better understanding. In addition, in this second modification, the groove portion covering the entire orbit 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 pivots the inlet 182a of the second passage 182. As an example, it is provided to be connected to the count bore part 184. Therefore, 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.

Further, in the second modified example, the count beam covering the entire trajectory 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 pivots the inlet 182a of the second passage 182. Although 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 count bore portion 184 covering a part of the orbit 181c of the outlet 181b of the first passage 181 when the orbiting scroll 12 is turning. You can also arrange. That is, the inlet 182a of the second passage 182 may be in communication with the outlet 181b of the first passage 181 in at least part of the cycle in which the orbiting scroll 12 rotates.

In addition, in the first modification example and the second modification example, the orbiting scroll 12 draws the first passage 181 that draws the refrigerant from the compression chamber 16 and introduces it into the second passage 182 in the fixed scroll 11. The second passage 182 provided in the inside and the refrigerant introduced in the first passage 181 provided in the orbiting scroll 12 into the third passage 183 in the main frame 13 are fixed in the fixed scroll 11 It is assumed that the arrangement is provided, but is not limited to this. It is also possible to assume a configuration in which the passage through which the refrigerant is drawn 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 premised, control of the communication timing between the first passage 181 and the second passage 182 mentioned in the first modification and the second modification becomes unnecessary.

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

Alternatively, on the premise of the shapes of the main frame 13 and the sub frame 14 of the first embodiment, the compression chamber (with the chambers 142a in FIGS. 2 to 4 as the chambers 172 in FIGS. 13 or 16) It is also possible to induce the intermediate pressure from 16) to the chamber 172. In addition, the space consisting of the chamber 142a and the chamber 121b in FIG. 5 may be used as the chamber 172 in FIG. 13 or 16 to induce intermediate pressure from the compression chamber 16 to the chamber 172.

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

In the above, specific examples have been illustrated and described. However, the present invention is not limited to the above-described embodiments, and a person skilled in the art to which the invention pertains may variously perform various changes without departing from the gist of the technical spirit of the invention described in the following claims. .

1, 2: scroll compressor
11: fixed scroll
12: orbiting scroll
121: plate
121a, 121b: chamber
123: body
123c, 123d: no seal
13: main frame
131, 132, 133, 134: body
134g, 134h: Guide member
135, 136: protrusion
14: sub frame
141, 142, 143: body
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: first passage
182: second passage
183: passage 3
184: count bore

Claims (20)

main body;
A fixed scroll fixed inside the main body and having a fixed wrap;
A orbiting scroll provided to orbit with respect to the fixed scroll, the orbiting scroll having a orbiting wrap forming a compression chamber with the orbiting wrap;
A main frame provided to support the fixed scroll; And
And a sub-frame disposed inside the main frame to support the orbiting scroll at a position displaced from the center of the orbiting scroll. According to claim 1,
A scroll compressor is formed between the main frame and the sub frame so that a gap is formed such that the sub frame is displaceable relative to the main frame. According to claim 1,
The orbiting scroll is further combined to include a rotation axis for orbiting,
The sub-frame is a scroll compressor provided with respect to the main frame to be displaceable 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,
In order to enable the orbiting scroll to orbit, it further includes a rotational shaft inserted into an axial through hole formed in the main frame and coupled to the orbiting scroll,
The main frame includes a first body portion having a fixed scroll support surface for supporting the fixed scroll, and a second body portion positioned under the first body portion and having the axial through hole,
The sub-frame includes a first body portion positioned inside the first body portion of the main frame, and a second body portion inserted into the shaft through hole to be positioned between the rotation shaft and the second body portion of the main frame and,
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. The method of claim 4,
The scroll compressor 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. The method of claim 4,
The sub-frame is provided to be displaceable relative to the main frame,
On the inner surface of the first body portion of the main frame, a scroll compressor in which a protrusion portion contactable with the first body portion of the sub frame is formed. The method of claim 6,
When the sub-frame is inclined during the displacement process, the scroll compressor is provided to contact the protrusions of the main frame and the first body portion of the sub-frame before the second body portion of the main frame and the second body portion of the sub-frame. . The method of claim 4,
The sub-frame is provided to be displaceable relative to the main frame,
The sub-frame further includes a thrust bearing positioned above the first body portion of the sub-frame and having a swinging scroll support surface for supporting the swinging scroll,
The thrust bearing is a scroll compressor having a shape capable of elastic deformation. According to claim 1,
Further comprising an Oldham ring (Oldam Ring) provided to prevent the rotation of the orbiting scroll,
The Oldham ring is a scroll compressor coupled to the orbiting scroll and the sub-frame. According to claim 1,
Further comprising an old ring provided to prevent the 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 old ring provided to prevent the rotation of the orbiting scroll,
The Oldham ring is a scroll compressor coupled to the orbiting scroll and the fixed scroll. According to claim 2,
A scroll compressor further comprising a seal member sealing a gap between the main frame and the sub frame so that a chamber is formed between the main frame and the sub frame. The method of claim 12,
A scroll compressor further comprising a passage provided to guide the refrigerant discharged from the compression chamber to the chamber. The method of claim 13,
The passage,
A first passage provided in the orbiting scroll so as to communicate with the compression chamber;
A second passage provided in the main frame to communicate with the chamber; And
And a third passage provided in the fixed scroll to connect the first passage and the second passage. The method of claim 14,
The outlet of the first passage forms an orbit according to the orbiting motion of the orbiting scroll,
A scroll compressor having an inlet of the third passage on the track. main body;
A fixed scroll fixed inside the main body and having a fixed wrap;
A orbiting scroll provided to orbit with respect to the fixed scroll, the orbiting scroll having a orbiting wrap forming a compression chamber with the orbiting wrap;
A rotation axis in which the orbiting scroll is combined to orbit;
A main frame provided to support the fixed scroll; And
A scroll compressor comprising a; a sub-frame disposed spaced apart from the main frame inside the main frame. The method of claim 16,
The gap between the upper end of the main frame and the upper end of the sub-frame located in the axial direction of the rotating shaft, the gap between the lower end of the main frame and the lower end of the sub-frame located in the axial direction of the rotating shaft Smaller scroll compressor. The method of claim 16,
The rotating shaft penetrates an axial through hole formed in the main frame and is coupled to the orbiting scroll,
The main frame includes a first body portion having a fixed scroll support surface for supporting the fixed scroll, and a second body portion positioned under the first body portion and having the axial through hole,
The sub-frame includes a first body portion positioned inside the first body portion of the main frame, and a second body portion inserted into the shaft through hole to be positioned between the rotation shaft and the second body portion of the main frame and,
The scroll compressor 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. The method of claim 16,
The sub-frame is provided to be displaceable relative to the main frame,
On the inner surface of the main frame, a scroll compressor in which projections that can contact the sub-frame are formed. The method of 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 positioned below the first body portion to have a smaller width than the first body portion,
The protrusion, the scroll compressor is formed to protrude from the inner surface of the main frame so as to be located between the upper end of the second body portion of the rotating frame forming surface and the sub-frame in the axial direction of the rotating shaft.

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