JP7438460B2 - scroll compressor - Google Patents

Description

The present disclosure relates to a scroll compressor having a compression mechanism section including two compression chambers.

A scroll compressor used in an air conditioner or a refrigerator includes a compression mechanism that compresses refrigerant in a compression chamber formed by combining a fixed scroll and an oscillating scroll, and a container that houses the compression mechanism. . The fixed scroll and the oscillating scroll each have a spiral body erected on a base plate, and the spiral bodies are engaged with each other to form a compression chamber. By swinging the swinging scroll, the compression chamber moves while reducing its volume, and sucks and compresses the refrigerant. In order to reduce the size and cost of these scroll compressors, technology is used to increase the suction volume of the compression chamber as much as possible without increasing the diameter of the container, thereby increasing the compression capacity. Development is underway.

In the case of a conventional scroll compressor, for example, a vertical scroll compressor, a compression mechanism is placed above the container, a driving motor is placed below, and a lubricating oil reservoir is placed further below the motor. There is. The compression mechanism section includes an oscillating scroll having a volute formed on both sides of a oscillating base plate, and a fixed scroll facing the volute. The oscillating scroll is driven by a motor via a coupled eccentric shaft to move the compression chamber and compress the refrigerant (for example, see Patent Document 1). In such a scroll compressor having two compression chambers, an upper compression chamber and a lower compression chamber, there is an in-shaft oil supply path in the drive shaft and a slide hole into which an Oldham key, which is an anti-rotation mechanism, is inserted in the rocking base plate. A bearing oil supply passage that communicates with the bearing portion of the drive shaft and the in-shaft oil supply passage is provided.

Japanese Patent Application Publication No. 10-110690

However, in Patent Document 1, although oil supply to the rotation prevention mechanism is taken into consideration, the lubricating oil supplied from the lubricating oil reservoir chamber through the inside of the rotating shaft is given priority to the lower compression chamber due to the influence of gravity. supplied. Therefore, there is a problem in that oil supply to the upper compression chamber is insufficient and loss due to sliding of the spiral body forming the upper compression chamber increases. In addition, due to insufficient oil supply, the sealing performance of the gap between the tip of the spiral body and the base plate deteriorates, and the efficiency of refrigerant compression decreases due to refrigerant leakage.

The present disclosure has been made in order to solve the above-mentioned problems, and improves the oil supply performance to the upper compression chamber of the spiral bodies arranged on both sides of the oscillating scroll base plate, and reduces loss due to sliding and An object of the present invention is to obtain a scroll compressor that suppresses a decrease in refrigerant compression efficiency due to refrigerant leakage.

The scroll compressor of the present disclosure includes a closed container, an electric mechanism section provided in the closed container, a compression mechanism section arranged below the electric mechanism section in the closed container, and a compression mechanism section arranged below the electric mechanism section in the closed container. The compression mechanism includes an oil reservoir provided below and a rotating shaft connecting the electric mechanism and the compression mechanism, and the compression mechanism connects the closed container to an upper space in which the electric mechanism is arranged. an oscillating scroll having an oscillating spiral body formed on both sides of a oscillating base plate; An upper fixed scroll and a lower fixed scroll each having a fixed spiral body forming a compression chamber and a lower compression chamber, the lower fixed scroll being formed on the outer periphery of the lower fixed scroll so that an external refrigerant can A lower introduction path for introduction, and an upper introduction path formed to branch from the lower introduction path and communicate with the upper compression chamber , and the rotating shaft is fitted to the oscillating scroll. an eccentric shaft part connected to the electric mechanism part and fitted to the upper fixed scroll; and a lower part fitted to the lower fixed scroll, the lower end of which is disposed in the oil sump part. a shaft portion, and an oil supply path formed inside the rotating shaft and extending from an end surface of the lower shaft portion to the upper shaft portion, and the eccentric shaft portion communicates with the oil supply path and is connected to the oil supply path of the eccentric shaft portion. The oscillating scroll is provided with an oil supply hole that opens on the outer circumferential surface, and the oscillating scroll is provided with a base plate communication hole that passes through the outer periphery of the oscillating base plate from the oscillating bearing that fits into the eccentric shaft portion, and the oscillating scroll The opening of the base plate communication hole located on the outer peripheral surface of the body opens toward a region above the upper introduction path .
Further, the scroll compressor of the present disclosure includes: a closed container; an electric mechanism section provided in the closed container; a compression mechanism section disposed below the electric mechanism section in the closed container; and a rotating shaft connecting the electric mechanism section and the compression mechanism section; an oscillating scroll which is partitioned into an upper space and the oil sump section and has an oscillating spiral body formed on both sides of a oscillating base plate; An upper fixed scroll and a lower fixed scroll each having a fixed spiral body forming an upper compression chamber and a lower compression chamber, and the lower fixed scroll is formed on the outer periphery of the lower fixed scroll and has an external A lower introduction path into which a refrigerant is introduced, and an upper introduction path formed to branch from the lower introduction path and communicate with the upper compression chamber, and the rotating shaft is fitted into the oscillating scroll. an upper shaft part connected to the electric mechanism part and fitted to the upper fixed scroll; and a lower shaft part fitted to the lower fixed scroll, the lower end of which is disposed in the oil sump part. a side shaft portion; and an oil supply path formed inside the rotating shaft and extending from an end surface of the lower shaft portion to the upper shaft portion, and the eccentric shaft portion communicates with the oil supply path and is connected to the eccentric shaft portion. The oscillating scroll includes a base plate communication hole extending from a oscillating bearing fitted with the eccentric shaft portion toward the outer periphery of the oscillating base plate, An end of the plate communication hole on the outer circumferential surface side of the rocking base plate has an opening that opens to the upper surface of the rocking base plate.

According to the scroll compressor of the present disclosure, refrigerating machine oil supplied from the oil reservoir through the inside of the rotating shaft is moved to the upper compression chamber side by the refrigerant passing through the upper introduction path. This ensures the supply of refrigerating machine oil to the upper compression chamber, which is difficult to supply due to the influence of gravity, and suppresses increased loss in the sliding part between the upper oscillating scroll and the upper fixed scroll and a decrease in refrigerant compression efficiency due to refrigerant leakage. can do.

1 is a longitudinal cross-sectional view illustrating the overall structure of a scroll compressor 100 according to a first embodiment. 2 is an enlarged view of the compression mechanism section 10 of FIG. 1. FIG. 3 is a sectional view taken along the line AA in FIG. 2. FIG. FIG. 3 is an explanatory diagram showing the flow of refrigerating machine oil in the scroll compressor 100 according to the first embodiment. FIG. 2 is a perspective view of a rotating shaft 204 of a scroll compressor 100 according to a second embodiment. 3 is a perspective view of a rotating shaft 304 of scroll compressor 100 according to Embodiment 3. FIG. FIG. 4 is an enlarged view of a cross-sectional structure of a compression mechanism section 410 of a scroll compressor 100 according to a fourth embodiment. 7 is an enlarged view of a cross-sectional structure of a compression mechanism section 510 of a scroll compressor 100 according to a fifth embodiment. FIG.

Embodiments of the scroll compressor of the present disclosure will be described below based on the drawings. In the drawings, items with the same reference numerals are the same or equivalent, and are common throughout the entire embodiment described below. The forms of the constituent elements shown in the entire specification are merely examples, and are not limited to the forms described in the specification. The drawings are schematic representations, and the relationship in size of each component may differ from the actual one.

Embodiment 1.
FIG. 1 is a longitudinal sectional view illustrating the overall structure of a scroll compressor 100 according to the first embodiment. Scroll compressor 100 according to Embodiment 1 includes a compression mechanism section 10 and an electric mechanism section 20 that drives compression mechanism section 10 via rotary shaft 4, and these constitute an outer shell of airtight container 50. It is stored inside. In the airtight container 50, the compression mechanism section 10 is arranged below the electric mechanism section 20.

The scroll compressor 100 is applied to a refrigeration cycle device such as an air conditioner or a refrigerator, and is connected by refrigerant piping to a heat exchanger and an expansion device that function as a condenser or an evaporator, and compresses the refrigerant. It has the function of converting it into a high-temperature, high-pressure gas refrigerant.

A suction pipe 51 for sucking refrigerant and a discharge pipe 52 for discharging the refrigerant are connected to the closed container 50. The suction pipe 51 is connected to the side surface of the closed container 50 where the compression mechanism section 10 is arranged, and the discharge pipe 52 is connected to the top surface of the closed container 50.

The compression mechanism section 10 has a function of compressing the refrigerant sucked in from the suction pipe 51 and discharging the compressed refrigerant to a high pressure section formed inside the closed container 50. The compression mechanism section 10 includes fixed scrolls 1 and 2 and an oscillating scroll 3.

An upper fixed scroll 1 is arranged above the swinging scroll 3. Further, a lower fixed scroll 2 is arranged below the swinging scroll 3. The upper fixed scroll 1 is fixed to the closed container 50 via the lower fixed scroll 2.

The swinging scroll 3 is arranged between the upper fixed scroll 1 and the lower fixed scroll 2. The rotating shaft 4 is supported by an upper bearing part 12 provided at the center of the upper fixed scroll 1 and a lower bearing part 13 provided at the center of the lower fixed scroll 2. The rotating shaft 4 is supported by bearings 12 and 13 and transmits driving force to the swinging scroll 3.

FIG. 2 is an enlarged view of the compression mechanism section 10 of FIG. 1. The upper fixed scroll 1 includes an upper fixed base plate 1a and an upper fixed spiral body 1c which is a spiral protrusion erected on one surface 1b of the upper fixed base plate 1a. The lower fixed scroll 2 includes a lower fixed base plate 2a and a lower fixed spiral body 2c which is a spiral protrusion erected on one surface 2b of the lower fixed base plate 2a.

The oscillating scroll 3 includes a oscillating base plate 3a, an upper oscillating spiral body 3ca, which is a spiral protrusion, erected on the upper surface 3ba of the oscillating base plate 3a, and an erected upper surface 3bb on the lower surface 3bb. The lower swinging spiral body 3cb is a spiral projection. The upper fixed spiral body 1c and the upper swinging spiral body 3ca have a symmetrical spiral shape with opposite phases, and are arranged in the closed container 50 in an engaged state. Similarly, the lower fixed spiral body 2c and the lower swinging spiral body 3cb have a symmetrical spiral shape with opposite phases, and are arranged in the closed container 50 in an intertwined state.

An upper compression chamber 71 is formed between the upper fixed spiral body 1c and the upper swinging spiral body 3ca. The upper compression chamber 71 is configured to move from the outside in the radial direction to the inside as the upper swinging spiral body 3ca swings as the rotating shaft 4 rotates, and the volume decreases as it moves inward. ing.

Similarly, a lower compression chamber 72 is formed between the lower fixed spiral body 2c and the lower swinging spiral body 3cb. The lower compression chamber 72 moves from the outside in the radial direction to the inside as the lower swinging spiral body 3cb swings as the rotating shaft 4 rotates, and the volume decreases as it moves inward. It is composed of

The upper fixed scroll 1 and the lower fixed scroll 2 are fixedly arranged in the closed container 50. An introduction path 60 for guiding the refrigerant sucked from the suction pipe 51 into the compression mechanism section 10 is formed through the lower fixed scroll 2 from the outer peripheral surface toward the lower fixed scroll body 2c. The introduction path 60 also includes a lower introduction path 61 that goes straight inward from the outer peripheral surface and introduces the refrigerant into the lower compression chamber 72, and a lower introduction path 61 that branches upward from the lower introduction path 61 and introduces the refrigerant into the upper compression chamber 71. It is provided with an upper introduction path 62 for introduction.

An upper discharge port 1d is provided in the center of the upper fixed base plate 1a of the upper fixed scroll 1, and an upper discharge valve 1e is provided at the outlet of the upper discharge port 1d. Further, a lower fixed base plate 2a of the lower fixed scroll 2 is provided with a lower discharge port 2d, and a lower discharge valve 2e is provided at the outlet of the lower discharge port 2d. As shown in FIG. 1, an upper discharge muffler 6a and a lower discharge muffler 6b are attached to the upper and lower surfaces of the compression mechanism section 10 so as to cover the upper discharge port 1d and the lower discharge port 2d, respectively. There is.

An Oldham ring 5 is disposed above the lower fixed scroll 2 and between the swinging scroll 3 and the swinging scroll 3 to prevent the swinging scroll 3 from rotating during its orbiting motion. The key portion 5a of the Oldham ring 5 protrudes downward from the swinging base plate 3a of the swinging scroll 3, and fits into a groove 2f formed on the upper surface of the lower fixed scroll 2.

The electric mechanism section 20 supplies rotational driving force to the rotating shaft 4, and includes an electric motor stator 21 and an electric motor rotor 22, as shown in FIG. The motor stator 21 is connected to a glass terminal (not shown) installed in a closed container 50 with a lead wire (not shown) in order to obtain electric power from the outside. Further, the motor stator 21 is fixed to the rotating shaft 4 by shrink fitting or the like. Further, in order to balance the entire rotation system of the scroll compressor 100, a first balance weight 23 and a second balance weight 24 are fixed to the motor rotor 22.

The rotating shaft 4 includes an upper shaft portion 4a located at the top, a lower shaft portion 4b located at the bottom, and an eccentric shaft portion 4c at the bottom. The upper shaft portion 4a has the electric motor rotor 22 fixed thereto, and is fitted with the upper bearing portion 12 of the upper fixed scroll 1 below the portion where the electric motor rotor 22 is fixed. The lower shaft portion 4b is fitted into the lower bearing portion 13 of the lower fixed scroll 2. The eccentric shaft portion 4c is located between the upper shaft portion 4a and the lower shaft portion 4b, and is fitted into the swing bearing 11 of the swing scroll 3. The central axis of the eccentric shaft portion 4c is eccentric with respect to the central axes of the upper shaft portion 4a and the lower shaft portion 4b of the rotating shaft 4. The eccentric shaft portion 4c is configured such that the swinging scroll swings as the rotation shaft 4 rotates.

The upper shaft part 4a and the lower shaft part 4b are an upper bearing part 12 and a lower bearing part 13 arranged on the inner periphery of a cylindrical boss part provided on the upper fixed scroll 1 and the lower fixed scroll 2, respectively. The two are fitted together through an oil film made of refrigerating machine oil. The upper bearing part 12 and the lower bearing part 13 are made of a bearing material used for sliding bearings, such as a copper-lead alloy, and are fixed to the boss parts of the upper fixed scroll 1 and the lower fixed scroll 2 by press fitting or the like.

As shown in FIG. 1, a space 90 within the closed container 50 is defined as follows. Among the internal spaces of the airtight container 50, the space above the motor rotor 22 is defined as a first space 91. A space surrounded by the motor rotor 22 and the compression mechanism section 10 is defined as a second space 92. The space below the compression mechanism section 10 is defined as an oil reservoir section 93. The first space 91 and the second space 92 may be collectively referred to as an upper space. That is, the compression mechanism section 10 partitions the space 90 of the closed container 50 into an upper space and an oil reservoir section 93.

The lower end portion of the lower shaft portion 4b of the rotating shaft 4 is configured to be immersed in refrigerating machine oil accumulated in an oil reservoir portion 93 at the lowest portion of the closed container 50. Inside the rotating shaft 4, an oil supply path 40 is formed which is opened at the lower end surface 4d of the lower shaft portion 4b and extends to the upper shaft portion 4a. The oil supply path 40 is connected to oil supply holes 41, 42, and 43 extending in the radial direction of the rotating shaft 4, as shown in FIG. The oil supply hole 41 is provided in the upper shaft portion 4 a and communicates with the upper bearing portion 12 . The oil supply hole 42 is provided in the lower shaft portion 4b and communicates with the lower bearing portion 13. The oil supply hole 43 is provided in the eccentric shaft portion 4c and communicates with the swing bearing 11.

FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. Inside the rocking base plate 3a of the rocking scroll 3, a base plate communication hole 3d is provided which communicates from the rocking bearing 11 to the outer peripheral surface of the rocking base plate 3a. FIG. 3 shows a cross section perpendicular to the central axis of the rotating shaft 4 and including the base plate communication hole 3d. The base plate communication hole 3d is arranged so as to extend from the swing bearing 11 toward the area where the upper introduction path 62 installed in the lower fixed scroll 2 is installed in FIG. 3. That is, the center of the base plate communication hole 3d is located in a region B between the straight lines connecting the central axis of the rotating shaft 4 and both radial ends of the upper introduction path 62, as shown in FIG. .

(Flow of refrigerant in scroll compressor 100)
Next, the flow of refrigerant in the scroll compressor 100 according to the first embodiment will be explained using FIGS. 1 and 2. The arrows shown in FIG. 1 indicate the flow of refrigerant. As the electric mechanism section 20 is driven, refrigerant flows into the closed container 50 from the refrigeration cycle circuit connected to the scroll compressor 100 via the suction pipe 51. The suction pipe 51 communicates with an introduction path 60 of the compression mechanism section 10 , and the refrigerant flowing from the suction pipe 51 flows into the compression mechanism section 10 . The refrigerant flowing in from the suction pipe 51 is relatively low pressure refrigerant in the refrigeration cycle circuit.

The low-pressure refrigerant that has flowed into the lower introduction path 61 provided in the lower fixed scroll 2 branches into a lower introduction path 61 and an upper introduction path 62. The refrigerant that has passed through the lower introduction path 61 flows into the lower compression chamber 72 . The refrigerant flowing into the lower compression chamber 72 is made high pressure by the lower fixed spiral body 2c and the lower swinging spiral body 3cb, and is discharged from the lower discharge port 2d into the lower discharge muffler 6b. A refrigerant flow path 63 is formed in the outer circumference of the upper fixed scroll 1 and the lower fixed scroll 2, and extends vertically through the outer periphery of the upper fixed scroll 1 and the lower fixed scroll 2. It communicates with the internal space of the discharge muffler 6a. The refrigerant discharged to the lower discharge muffler 6b passes through the refrigerant flow path 63 and enters the upper discharge muffler 6a, and is transferred to the electric mechanism section 20 and the compression mechanism section 10 from the muffler discharge port 64 formed on the upper surface of the upper discharge muffler 6a. The liquid is discharged into the second space 92 between the two spaces.

The low-pressure refrigerant that has flowed into the upper compression chamber 71 from the upper introduction path 62 branched from the lower introduction path 61 is made high pressure by the upper fixed spiral body 1c and the upper oscillating spiral body 3ca, and is then transferred from the upper discharge port 1d to the upper discharge muffler. It is discharged into the inside of 6a. The refrigerant discharged into the internal space of the upper discharge muffler 6a joins with the refrigerant compressed in the lower compression chamber 72 that has passed through the refrigerant flow path 63, and is then discharged from the muffler discharge port 64 formed on the upper surface of the upper discharge muffler 6a. It is discharged into the second space 92 between the electric mechanism section 20 and the compression mechanism section 10.

The refrigerant that has flowed into the second space 92 passes through the hole 25 installed in the electric mechanism section 20 and the gap between the motor stator 21 and the motor rotor 22, flows into the first space 91, and enters the upper end of the airtight container 50. It is discharged to the outside of the scroll compressor 100 from a discharge pipe 52 provided in the scroll compressor 100 .

(Flow of refrigerating machine oil in scroll compressor 100)
FIG. 4 is an explanatory diagram showing the flow of refrigerating machine oil in the scroll compressor 100 according to the first embodiment. The flow of refrigerating machine oil within the scroll compressor 100 will be explained using FIGS. 2 to 4. Note that the broken line arrows shown in FIGS. 2 and 4 indicate the flow of refrigerating machine oil. In FIG. 4, the refrigerating machine oil stored in the oil reservoir 93 is supplied to the upper bearing 12, the lower bearing 13, and the swing bearing 11 via the oil supply path 40 provided inside the rotating shaft 4. . Refrigerating machine oil is supplied to the upper bearing part 12, the lower bearing part 13, and the swing bearing 11 through oil supply holes 41, 42, and 43.

Refrigerating machine oil supplied to the lower bearing part 13 is returned to the oil sump part 93 via a groove 45 arranged in the lower bearing part 13 and extending in the axial direction. The refrigerating machine oil supplied to the upper bearing part 12 flows out into the second space 92 via the axially extending groove 44 arranged in the upper bearing part 12 .

As shown in FIG. 2, the refrigerating machine oil supplied to the swing bearing 11 is supplied to the swing base plate through a radial bed plate communication hole 3d arranged inside the swing base plate 3a of the swing scroll 3. It flows out into the suction space 65 on the outer peripheral side of 3a. A part of the refrigerating machine oil that has flowed into the suction space 65 is supplied to the lower compression chamber 72 from the upper introduction path 62 through the lower introduction path 61 due to gravity. Further, another part of the refrigerating machine oil that has flowed into the suction space 65 is supplied to the upper compression chamber 71 and the Oldham ring 5 by the flow of refrigerant flowing upward through the upper introduction path 62.

The refrigerating machine oil supplied to the upper compression chamber 71 and the lower compression chamber 72 mixes with the refrigerant gas to be compressed, and flows from the muffler discharge port 64 of the upper discharge muffler 6a to the second space 92 along with the refrigerant flow shown in FIG. It will be leaked. The refrigerating machine oil that has flowed into the second space 92 flows out into the first space 91 through the hole 25 of the electric mechanism section 20 together with the refrigerating machine oil discharged from the groove 44 of the upper bearing section 12 . The refrigerating machine oil that has flowed into the first space 91 collides with the rotating plate 46 installed at the upper end of the rotating shaft 4, is swirled, and is separated by swirling due to the density difference between the refrigerant gas and the refrigerating machine oil. The separated refrigerating machine oil moves to the outer wall of the airtight container 50 and flows out to the vicinity of the wall of the second space 92 through the oil return channel 26 installed on the outer periphery of the motor stator 21 due to gravity. The oil passes through the communication channel 48 shown in FIG. 3 and is returned to the oil reservoir 93. The communication channel 48 is configured by connecting holes provided corresponding to the upper fixed scroll 1 and the lower fixed scroll 2, respectively.

(Effects of Embodiment 1)
According to the scroll compressor 100 according to the first embodiment, the lower fixed scroll 2 has a lower introduction path 61 formed on the outer circumference of the lower fixed scroll 2 and into which external refrigerant is introduced, and a lower introduction path. An upper introduction path 62 is formed so as to branch from 61 and communicate with the upper compression chamber 71. With this configuration, the flow of refrigerant can be introduced from the lower introduction path 61 to the upper introduction path 62, and refrigerating machine oil can be supplied to the upper compression chamber 71 along with the flow of refrigerant. By introducing refrigerating machine oil into the upper compression chamber 71, it is possible to suppress a decrease in reliability due to insufficient oil supply of the spiral sliding portion of the upper fixed scroll 1 and the oscillating scroll 3. Furthermore, deterioration in sealing performance between the upper fixed scroll 1 and the swinging scroll 3 can be suppressed.

Further, according to the scroll compressor 100 according to the first embodiment, since substantially symmetrical spiral teeth are formed on both sides of the oscillating scroll 3, refrigerant is compressed in the upper compression chamber 71 and the lower compression chamber 72. The thrust loads caused by this cancel each other out. Therefore, it is not necessary to provide a thrust bearing in the compression mechanism section 10. Therefore, the scroll compressor 100 according to the first embodiment can prevent burnout of the compression mechanism section 10 due to the thrust load without worrying about an increase in friction loss due to lack of oil film on the thrust bearing, which has a low circumferential speed and is difficult to form an oil film. .

According to the scroll compressor 100 according to the first embodiment, since the compression mechanism section 10 includes a double-end bearing structure that supports the rotating shaft 4 on both sides, no moment is generated on the rotating shaft 4. This can prevent the rotating shaft 4 from tilting and making uneven contact with the bearing parts 12 and 13, and can prevent an increase in loss in the bearing parts 12 and 13 and burnout of the bearing parts 12 and 13 due to uneven contact. can. Further, since the spiral teeth on both sides of the oscillating scroll are formed substantially symmetrically and have substantially the same height as described above, the structure is simple and can be easily formed.

Further, according to the scroll compressor 100 according to the first embodiment, the eccentric shaft portion 4c includes an oil supply hole 43 that communicates with the oil supply path 40 and opens in the outer peripheral surface 3f of the eccentric shaft portion 4c. The rocking scroll 3 includes a base plate communication hole 3d that communicates with the outer peripheral surface of the rocking base plate 3a from the rocking bearing 11 fitted with the eccentric shaft portion 4c, and the base plate communication hole 3d located on the outer peripheral surface 3f. The opening opens toward a region above the upper introduction path 62. With this configuration, the refrigerating machine oil discharged from the opening of the base plate communication hole 3d is supplied to the upper compression chamber 71 together with the refrigerant flowing through the upper introduction path 62. This suppresses refrigerating machine oil from being preferentially supplied to the lower compression chamber 72 due to the influence of gravity, and suppresses deterioration of the lubrication and sealing properties of the upper compression chamber 71.

Embodiment 2.
Scroll compressor 100 according to Embodiment 2 will be described. The scroll compressor 100 according to the second embodiment has a structure of the rotating shaft 4 that is different from the first embodiment. In the second embodiment, differences from the first embodiment will be mainly explained.

FIG. 5 is a perspective view of the rotating shaft 204 of the scroll compressor 100 according to the second embodiment. In the scroll compressor 100 according to the second embodiment, the outlet of the oil supply hole 43 provided in the eccentric shaft portion 4c of the rotating shaft 204 is cut by a plane parallel to the central axis provided on the outer peripheral surface of the eccentric shaft portion 4c. It is arranged on the formed cut surface 4e. Thereby, the supply of refrigerating machine oil in the height direction of the swing bearing 11 can be improved. Furthermore, the oil supply space formed by the cut surface 4e and the base plate communication hole 3d are intermittently communicated with each other due to the rotation of the rotary shaft 204, thereby improving the oil supply performance to the suction space 65.

Embodiment 3.
Scroll compressor 100 according to Embodiment 3 will be described. Scroll compressor 100 according to Embodiment 3 has a structure of rotating shaft 4 changed from Embodiment 1. In the second embodiment, differences from the first embodiment will be mainly explained.

FIG. 6 is a perspective view of the rotating shaft 304 of the scroll compressor 100 according to the third embodiment. In the scroll compressor 100 according to the third embodiment, the outlet of the oil supply hole 43 of the rotating shaft 304 is arranged at the bottom of the groove 4f formed in the circumferential direction on the outer periphery of the eccentric shaft portion 4c. This improves the oil supply performance in the circumferential direction of the swing bearing 11. Additionally, the oil supply space formed by the groove 4f and the base plate communication hole 3d are continuously communicated with each other, thereby improving the oil supply performance to the suction space 65.

Embodiment 4.
Scroll compressor 100 according to Embodiment 4 will be described. Scroll compressor 100 according to Embodiment 4 differs from Embodiment 1 in that the structure of base plate communication hole 3d is changed. In the fourth embodiment, differences from the first embodiment will be mainly explained.

FIG. 7 is an enlarged view of the cross-sectional structure of the compression mechanism section 410 of the scroll compressor 100 according to the fourth embodiment. In the scroll compressor 100 according to the fourth embodiment, the base plate communication hole 403d provided in the rocking base plate 3a of the rocking scroll 403 is not opened in the outer peripheral surface of the rocking base plate 3a. , an opening 3da is provided on the upper surface 3ba of the swinging base plate 3a. The opening 3da is provided on the outside of the upper rocking spiral body 3ca, and is configured to supply refrigerating machine oil to the suction space 65. With this configuration, the refrigerating machine oil is easily supplied to the upper compression chamber 71 together with the refrigerant, so that the scroll compressor 100 improves oil supply performance to the upper compression chamber 71.

Note that although FIG. 7 shows a structure to which the rotating shaft 204 described in the second embodiment is applied, a rotating shaft 4 having an eccentric shaft portion 4c without a cut surface 4e as in the first embodiment is applied. You may do so.

Embodiment 5.
Scroll compressor 100 according to Embodiment 5 will be described. Scroll compressor 100 according to Embodiment 5 differs from Embodiment 1 in that the structure of base plate communication hole 3d is changed. In the fifth embodiment, differences from the first embodiment will be mainly explained.

FIG. 8 is an enlarged view of the cross-sectional structure of the compression mechanism section 510 of the scroll compressor 100 according to the fifth embodiment. In the scroll compressor 100 according to the fifth embodiment, the base plate communication hole 503d provided in the rocking base plate 3a of the rocking scroll 503 is not opened in the outer peripheral surface of the rocking base plate 3a. , an opening 3da is provided on the upper surface 3ba of the swinging base plate 3a, and an opening 3db is provided on the lower surface 3bb. That is, the base plate communication hole 503d branches upward and downward on the outside of the upper rocking spiral body 3ca and the lower rocking spiral body 3cb, and opens toward the upper and lower sides of the rocking base plate 3a.

The opening 3da is provided on the outside of the upper rocking spiral body 3ca, and is configured to supply refrigerating machine oil to the suction space 65. With this configuration, the scroll compressor 100 can supply refrigerating machine oil from the base plate communication hole 503d to the upper compression chamber 71 and the lower compression chamber 72 in a well-balanced manner. Thereby, it is possible to improve oil supply distribution to the upper compression chamber 71 and the lower compression chamber 72, and supply oil to both spirals in a well-balanced manner.

The size of the opening 3da and the opening 3db may be changed. For example, by making the opening area of the opening 3db that opens toward the bottom smaller than the opening 3da that opens toward the top, the upper compression chamber 71 is difficult to be supplied with refrigerating machine oil due to the influence of gravity. It is possible to increase the amount of refrigerating machine oil supplied to the With this configuration, the amount of refrigerating machine oil supplied to the upper compression chamber 71 and the lower compression chamber 72 can be balanced.

As described above, Embodiments 1 to 5 of the present disclosure have been described, but Embodiments 1 to 5 are examples of the scroll compressor 100, and can be combined with other known techniques. Furthermore, part of the configuration of the scroll compressor 100 can be omitted and changed without departing from the gist of the present disclosure.

1 (Upper) fixed scroll, 1a upper fixed base plate, 1b surface, 1c upper fixed spiral body, 1d upper discharge port, 1e upper discharge valve, 2 lower fixed scroll, 2a lower fixed base plate, 2b surface, 2c lower Side fixed spiral, 2d Lower discharge port, 2e Lower discharge valve, 2f Groove, 3 Oscillating scroll, 3a Oscillating base plate, 3ba Upper surface, 3bb Lower surface, 3ca Upper oscillating volute, 3cb Lower oscillating volute. body, 3d base plate communication hole, 3da opening, 3db opening, 3f outer circumferential surface, 4 rotating shaft, 4a upper shaft, 4b lower shaft, 4c eccentric shaft, 4d lower end surface, 4e cut surface, 4f groove , 5 Oldham ring, 5a key part, 6a upper discharge muffler, 6b lower discharge muffler, 7 lower compression chamber, 10 compression mechanism part, 11 swing bearing, 12 (upper side) bearing part, 13 (lower side) bearing part , 20 electric mechanism section, 21 electric motor stator, 22 electric motor rotor, 23 first balance weight, 24 second balance weight, 25 hole, 26 oil return passage, 40 oil supply path, 41 oil supply hole, 42 oil supply hole, 43 Oil supply hole, 44 Groove, 46 Rotating plate, 48 Communication channel, 50 Airtight container, 51 Suction pipe, 52 Discharge pipe, 60 Introduction route, 61 Lower introduction route, 62 Upper introduction route, 63 Refrigerant flow route, 64 Muffler discharge outlet, 65 suction space, 71 upper compression chamber, 72 lower compression chamber, 90 space, 91 first space, 92 second space, 93 oil sump, 100 scroll compressor, 204 rotating shaft, 304 rotating shaft, 403 rocking Moving scroll, 403d Base plate communication hole, 410 Compression mechanism section, 503 Oscillating scroll, 503d Base plate communication hole, 510 Compression mechanism section, B area.

Claims (9)

an airtight container;
an electric mechanism section provided in the airtight container;
a compression mechanism section disposed below the electric mechanism section in the airtight container;
an oil reservoir provided below the compression mechanism;
a rotating shaft connecting the electric mechanism section and the compression mechanism section,
The compression mechanism section is
partitioning the sealed container into an upper space in which the electric mechanism section is arranged and the oil sump section;
an oscillating scroll in which an oscillating spiral body is formed on both sides of a oscillating base plate;
An upper fixed scroll and a lower fixed scroll each having a fixed spiral body disposed on both sides of the oscillating scroll and forming an upper compression chamber and a lower compression chamber corresponding to the oscillating scroll body, respectively;
The lower fixed scroll is
a lower introduction path formed on the outer periphery of the lower fixed scroll and into which an external refrigerant is introduced;
an upper introduction path formed to branch from the lower introduction path and communicate with the upper compression chamber ,
The rotation axis is
an eccentric shaft portion that fits into the oscillating scroll;
an upper shaft part connected to the electric mechanism part and fitted to the upper fixed scroll;
a lower shaft portion that fits into the lower fixed scroll and has a lower end portion disposed in the oil sump portion;
an oil supply path formed inside the rotating shaft and extending from the end surface of the lower shaft portion to the upper shaft portion,
The eccentric shaft portion is
an oil supply hole that communicates with the oil supply path and opens on the outer peripheral surface of the eccentric shaft,
The oscillating scroll is
a base plate communication hole passing through the outer peripheral surface of the rocking base plate from a rocking bearing that fits with the eccentric shaft portion;
The opening of the base plate communication hole located on the outer peripheral surface of the oscillating spiral body is
A scroll compressor that opens toward a region above the upper introduction path . an airtight container;
an electric mechanism section provided in the airtight container;
a compression mechanism section disposed below the electric mechanism section in the airtight container;
an oil reservoir provided below the compression mechanism;
a rotating shaft connecting the electric mechanism section and the compression mechanism section,
The compression mechanism section is
partitioning the sealed container into an upper space in which the electric mechanism section is arranged and the oil sump section;
an oscillating scroll in which an oscillating spiral body is formed on both sides of a oscillating base plate;
An upper fixed scroll and a lower fixed scroll each having a fixed spiral body disposed on both sides of the oscillating scroll and forming an upper compression chamber and a lower compression chamber corresponding to the oscillating scroll body, respectively;
The lower fixed scroll is
a lower introduction path formed on the outer periphery of the lower fixed scroll and into which an external refrigerant is introduced;
an upper introduction path formed to branch from the lower introduction path and communicate with the upper compression chamber ,
The rotation axis is
an eccentric shaft portion that fits into the oscillating scroll;
an upper shaft part connected to the electric mechanism part and fitted to the upper fixed scroll;
a lower shaft portion that fits into the lower fixed scroll and has a lower end portion disposed in the oil sump portion;
an oil supply path formed inside the rotating shaft and extending from the end surface of the lower shaft portion to the upper shaft portion,
The eccentric shaft portion is
an oil supply hole that communicates with the oil supply path and opens on the outer peripheral surface of the eccentric shaft,
The oscillating scroll is
a base plate communication hole extending from a rocking bearing that fits into the eccentric shaft portion toward an outer peripheral surface of the rocking base plate;
An end of the base plate communication hole on the outer circumferential surface side of the swing base plate,
A scroll compressor comprising an opening opening on the upper surface of the rocking base plate . An end of the base plate communication hole on the outer circumferential surface side of the swing base plate,
The scroll compressor according to claim 2 , further comprising an opening opening on the lower surface of the rocking base plate. The opening on the lower surface of the rocking base plate is
4. The scroll compressor according to claim 3 , wherein the opening area is smaller than that of the opening opening on the upper surface of the rocking base plate. The base plate communication hole and the oil supply hole are
The scroll compressor according to any one of claims 1 to 4 , wherein the rotating shafts overlap in axial position. The eccentric shaft portion is
having a cut surface on the outer peripheral surface that is a plane parallel to the central axis of the rotating shaft;
The oil supply hole is
The scroll compressor according to any one of claims 1 to 5 , wherein the scroll compressor has an opening in the cut surface. The eccentric shaft portion is
having a groove formed in the circumferential direction of the rotating shaft on the outer peripheral surface;
The oil supply hole is
The scroll compressor according to any one of claims 1 to 5 , wherein the groove is opened at a bottom surface. The oscillating spiral body is
The scroll compressor according to any one of claims 1 to 7 , wherein both sides of the rocking table plate are formed in a symmetrical shape. The oscillating spiral body is
The scroll compressor according to any one of claims 1 to 8 , wherein both sides of the rocking table plate are formed in a symmetrical shape.

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