JP6688972B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor which is used particularly in air conditioners, water heaters, refrigerators and other refrigerators.

In a refrigeration system or air conditioner, a scroll that draws in the gas refrigerant evaporated in the evaporator, compresses the gas refrigerant to the pressure necessary to condense it in the condenser, and sends the high temperature and high pressure gas refrigerant into the refrigerant circuit. A compressor is used.
By the way, in patent document 1, after forming the scroll body of each scroll in an asymmetrical spiral with different winding angles, the back pressure extraction hole connected to a back pressure mechanism is alternately provided in the fluid working chambers A and B of two systems. It is disclosed that the opening to the position communicating with the back pressure mechanism appropriately controls the pressure introduced into the back pressure mechanism to reduce the thrust loss, reduce the fluctuation of the back pressure, and stabilize the behavior of the orbiting scroll. ing.
Further, in Patent Document 2, a compression chamber side communication port of a back pressure communication passage is provided at a position where the bottom of one scroll member faces the compression chambers of both systems, and the scroll is provided with the compression chamber side communication port. By using a tooth profile that precedes the start of compression of the compression chamber formed by the internal line of the member, the fluctuation range of the pressure of the compression chamber communicating with the compression chamber side communication port becomes small, and the fluctuation range of the back pressure accompanying this becomes small. Is disclosed.

JP, 9-177683, A JP, 2010-276001, A

  However, in the configurations of Patent Document 1 and Patent Document 2, especially under a low compression ratio condition, if the intermediate pressure during the compression of the compression chamber becomes too high, the orbiting scroll separates.

  Therefore, the present invention is to provide a scroll compressor in which the intermediate pressure during the compression of the compression chamber is adjusted to a predetermined pressure and the compression ratio under the low compression ratio condition in which the orbiting scroll separates from the fixed scroll can be reduced.

In the scroll compressor of the present invention according to claim 1, a compression mechanism section for compressing a refrigerant and an electric mechanism section for driving the compression mechanism section are arranged in a closed container, and the compression mechanism section is fixed. A scroll, an orbiting scroll, and a rotary shaft that orbitally drives the orbiting scroll, and the fixed scroll includes a disk-shaped fixed scroll end plate and a fixed spiral wrap standing on the fixed scroll end plate. The orbiting scroll comprises a disc-shaped orbiting scroll end plate, an orbiting spiral wrap standing on the wrap side end face of the orbiting scroll end plate, and a boss portion formed on the non-wrap side end face of the orbiting scroll end plate, An eccentric shaft that is inserted into the boss is formed at the upper end of the rotary shaft, and the fixed spiral wrap and the swirl spiral wrap are meshed with each other to form the fixed spiral wrap. A plurality of compression chambers are formed between the swirl wrap and the swirl spiral wrap, and as the compression chamber, a first compression chamber is formed on the outer wall side of the swirl spiral wrap and on the inner wall side of the swirl spiral wrap. A second compression chamber is formed, the suction volume of the first compression chamber is made larger than the suction volume of the second compression chamber, and the fixed scroll and the orbiting scroll are provided below the fixed scroll and the orbiting scroll. A main bearing that supports the rotary shaft is provided in the main bearing, and a boss accommodating portion that accommodates the boss is formed in the main bearing, and the main bearing is provided between the fixed scroll and the main bearing. Is provided with a rotation restraint member for restraining the rotation of the orbiting scroll, the boss accommodating portion as a high pressure region, and the outer peripheral portion of the orbiting scroll in which the rotation restraint member is arranged as an intermediate pressure region, A scroll compressor for pressing an orbiting scroll against the fixed scroll, wherein the fixed scroll end plate is provided with an intermediate pressure extraction hole for extracting an intermediate pressure of the compression chamber, and the fixed scroll has the intermediate pressure extraction hole and the intermediate pressure extraction hole. An intermediate pressure communication passage communicating with the region is formed, and a high pressure communication passage communicating with the fixed pressure scroll and the high pressure space in the closed container is formed in the fixed scroll, and the high pressure opening of the high pressure communication passage is formed. A balance valve is provided.
According to a second aspect of the present invention, in the scroll compressor according to the first aspect, an oil storage portion for storing lubricating oil is formed in a bottom portion of the hermetic container, and the rotary shaft has a lower end of the rotary shaft. To the eccentric shaft, a rotary shaft oil supply hole is formed, and the orbiting scroll end plate has a first oil introduction hole formed in the boss portion and a first oil discharge hole formed on the outer periphery of the lap side end surface. A first end plate oil communication passage that communicates the first oil introduction hole and the first oil outlet hole, and the fixed scroll slides with the orbiting scroll end plate located on the outer periphery of the orbiting spiral wrap. A fixed scroll sliding surface is provided, the intermediate pressure area is formed on the outer periphery of the fixed scroll sliding surface, and a sliding surface groove communicating with the intermediate pressure area is provided on the fixed scroll sliding surface. The lubricating oil stored in the oil storage portion is introduced into the boss portion through the rotary shaft oil supply hole, and the lubricating oil introduced into the boss portion passes through the first end plate oil communication passage and The lubricating oil introduced into the sliding surface groove and introduced into the sliding surface groove is introduced into the intermediate pressure region.
According to a third aspect of the present invention, in the scroll compressor according to the second aspect, at the rotational position where the eccentric shaft center of the eccentric shaft is closest to the sliding surface groove, the first oil lead-out hole and the sliding It is characterized by communicating with the moving surface groove.
According to a fourth aspect of the present invention, in the scroll compressor according to the second or third aspect, the orbiting scroll end plate has a second oil introduction hole opening in the intermediate pressure region, and a low pressure of the compression chamber. A second oil outlet hole that opens into a space and a second end plate oil communication passage that connects the second oil inlet hole and the second oil outlet hole are provided, and the lubricating oil introduced into the intermediate pressure region is Is introduced into the low pressure space of the compression chamber through the second end plate oil communication passage.

  According to the present invention, especially under a low compression ratio condition, it is possible to prevent the orbiting scroll from separating from the fixed scroll, and to enhance the airtightness of the compression chamber.

1 is a vertical sectional view of a scroll compressor according to an embodiment of the present invention. Enlarged sectional view of the main part of the compression mechanism part of FIG. Plan views of the fixed scroll and the orbiting scroll shown in FIGS. 1 and 2. Explanatory drawing showing the supply operation of the lubricating oil in the boss portion to the intermediate pressure region Explanatory drawing showing the derivation operation of the lubricating oil in the intermediate pressure region to the compression chamber Explanatory drawing which shows the positional relationship between the oil supply path and the seal member accompanying the orbiting motion of the scroll compressor. The graph which shows the pressure fluctuation of the intermediate pressure taken out from the intermediate pressure extraction hole in the scroll compressor of a present Example. A graph showing the pressure fluctuation of the intermediate pressure taken out from the intermediate pressure extraction hole in the scroll compressor as a comparative example. A graph showing the pressure fluctuation of the intermediate pressure taken out from the intermediate pressure extraction hole in the scroll compressor as a comparative example. FIG. 3 is a vertical sectional view of a scroll compressor according to another embodiment of the present invention. Enlarged sectional view of the main part of the compression mechanism part of FIG.

  In the scroll compressor according to the first embodiment of the present invention, the fixed scroll end plate is provided with an intermediate pressure extraction hole for extracting the intermediate pressure of the compression chamber, and the fixed scroll communicates with the intermediate pressure extraction hole and the intermediate pressure region. An intermediate pressure communication passage is formed, a high pressure communication passage that communicates the intermediate pressure extraction hole with a high pressure space in a closed container is formed in the fixed scroll, and a balance valve is provided in the high pressure opening of the high pressure communication passage. . According to the present embodiment, especially under a low compression ratio condition, the orbiting scroll can be prevented from separating from the fixed scroll, the airtightness of the compression chamber can be enhanced, and the intermediate pressure during compression of the compression chamber is high. If too much, the balance valve is opened, the intermediate pressure during the compression of the compression chamber is adjusted to a predetermined pressure, and the compression ratio under the low compression ratio condition in which the orbiting scroll separates from the fixed scroll can be reduced.

  The second embodiment of the present invention is the scroll compressor according to the first embodiment, wherein an oil reservoir for storing lubricating oil is formed at the bottom of the hermetic container, and the rotary shaft has a lower end of the rotary shaft. To the eccentric shaft, a rotary shaft oil supply hole is formed, and the orbiting scroll end plate has a first oil introduction hole formed in the boss portion, a first oil discharge hole formed on the outer periphery of the wrap side end surface, and a first oil. A first end plate oil communication passage that connects the introduction hole and the first oil outlet hole is provided, and the fixed scroll is provided with a fixed scroll sliding surface that slides with the orbiting scroll end plate located on the outer periphery of the orbiting spiral wrap. An intermediate pressure area is formed on the outer circumference of the fixed scroll sliding surface, and a sliding surface groove communicating with the intermediate pressure area is provided on the fixed scroll sliding surface. Through the supply hole The lubricating oil introduced into the boss portion is introduced into the sliding surface groove through the first end plate oil communication passage, and the lubricating oil introduced into the sliding surface groove is introduced into the intermediate pressure region. It is what is done. According to the present embodiment, the first oil outlet hole formed on the outer periphery of the wrap side end surface and the sliding surface groove formed on the fixed scroll sliding surface communicate with each other to intermittently supply the lubricating oil to the intermediate pressure region. Can be supplied. Further, according to the present embodiment, since the wrap side end surface and the fixed scroll sliding surface are kept in close contact with each other without being separated, the oil amount can be adjusted by the first oil outlet hole and the sliding surface groove. It is easy to adjust the amount of oil.

  In the scroll compressor according to the second embodiment, the third embodiment of the present invention slides on the first oil lead-out hole at the rotational position where the center of the eccentric shaft is closest to the sliding surface groove. It communicates with the surface groove. According to the present embodiment, the maximum centrifugal force is applied to the lubricating oil present in the boss portion at the rotational position where the center of the eccentric shaft is closest to the sliding surface groove. Therefore, the lubricating oil existing in the boss portion can be surely introduced into the sliding surface groove by communicating the first oil outlet hole with the sliding surface groove at the timing when the maximum centrifugal force is applied. it can.

  The fourth embodiment of the present invention is a scroll compressor according to the second or third embodiment, wherein the orbiting scroll end plate has a second oil introduction hole opening in the intermediate pressure region and a compression chamber. A second oil outlet hole that opens into the low-pressure space and a second end plate oil communication passage that connects the second oil inlet hole and the second oil outlet hole are provided, and the lubricating oil introduced into the intermediate pressure region is It is introduced into the low pressure space of the compression chamber through the end plate oil communication passage. According to the present embodiment, by guiding the lubricating oil introduced into the intermediate pressure region to the low pressure space of the compression chamber, the lubricating oil in the intermediate pressure region can be circulated, resulting in insufficient lubrication in the intermediate pressure region and It is possible to prevent oil deterioration due to retention of lubricating oil.

Hereinafter, a scroll compressor according to an exemplary embodiment of the present invention will be described. The present invention is not limited to the examples below.
FIG. 1 is a vertical sectional view of a scroll compressor according to this embodiment.
A compression mechanism section 10 for compressing the refrigerant and an electric mechanism section 20 for driving the compression mechanism section 10 are arranged in the closed container 1.
The closed container 1 includes a cylindrical body 1a extending in the up-down direction, an upper lid 1c that closes an upper opening of the body 1a, and a lower lid 1b that closes a lower opening of the body 1a. There is.
The closed container 1 is provided with a refrigerant suction pipe 2 for introducing a refrigerant into the compression mechanism unit 10 and a refrigerant discharge pipe 3 for discharging the refrigerant compressed by the compression mechanism unit 10 to the outside of the closed container 1.
The compression mechanism unit 10 includes a fixed scroll 11, an orbiting scroll 12, and a rotating shaft 13 that orbitally drives the orbiting scroll 12.
The electric mechanism unit 20 includes a stator 21 fixed to the closed casing 1 and a rotor 22 arranged inside the stator 21. The rotating shaft 13 is fixed to the rotor 22. An eccentric shaft 13 a that is eccentric to the rotary shaft 13 is formed at the upper end of the rotary shaft 13.

Below the fixed scroll 11 and the orbiting scroll 12, a main bearing 30 that supports the fixed scroll 11 and the orbiting scroll 12 is provided.
The main bearing 30 is formed with a bearing portion 31 that supports the rotating shaft 13 and a boss accommodating portion 32. The main bearing 30 is fixed to the closed container 1 by welding or shrink fitting.

The fixed scroll 11 includes a disk-shaped fixed scroll end plate 11a, a spiral fixed spiral wrap 11b erected on the fixed scroll end plate 11a, and an outer peripheral wall 11c erected so as to surround the fixed spiral wrap 11b. And a discharge port 14 is formed at a substantially central portion of the fixed scroll end plate 11a.
The orbiting scroll 12 includes a disk-shaped orbiting scroll end plate 12a, an orbiting spiral wrap 12b standing on the wrap-side end face of the orbiting scroll end plate 12a, and a cylindrical boss portion formed on the non-wrap-side end face of the orbiting scroll end plate 12a. 12c and.
The fixed spiral wrap 11b of the fixed scroll 11 and the orbiting spiral wrap 12b of the orbiting scroll 12 mesh with each other, and a plurality of compression chambers 15 are formed between the fixed spiral wrap 11b and the orbiting spiral wrap 12b.
The boss portion 12c is formed substantially at the center of the orbiting scroll end plate 12a. The eccentric shaft 13a is inserted into the boss portion 12c, and the boss portion 12c is housed in the boss housing portion 32.

The fixed scroll 11 is fixed to the main bearing 30 using a plurality of bolts 16 at the outer peripheral wall portion 11c. On the other hand, the orbiting scroll 12 is supported by the fixed scroll 11 via a rotation restraint member 17 such as an Oldham ring. The rotation restraint member 17 that restrains the rotation of the orbiting scroll 12 is provided between the fixed scroll 11 and the main bearing 30. As a result, the orbiting scroll 12 makes an orbiting motion with respect to the fixed scroll 11 without rotating itself.
A lower end portion 13b of the rotary shaft 13 is pivotally supported by a sub bearing 18 arranged in a lower portion of the closed container 1.

An oil storage portion 4 for storing lubricating oil is formed at the bottom of the closed container 1.
A positive displacement oil pump 5 is provided at the lower end of the rotary shaft 13. The oil pump 5 is arranged so that its suction port exists inside the oil storage section 4. The oil pump 5 is driven by the rotating shaft 13 and can reliably suck up the lubricating oil in the oil reservoir 4 provided at the bottom of the closed container 1 regardless of the pressure condition or the operating speed, and there is no fear of running out of oil. Is also resolved.
The rotary shaft 13 is provided with a rotary shaft oil supply hole 13c extending from the lower end portion 13b of the rotary shaft 13 to the eccentric shaft 13a.
The lubricating oil sucked up by the oil pump 5 is supplied to the bearing of the auxiliary bearing 18, the bearing portion 31, and the boss portion 12c through the rotation shaft oil supply hole 13c formed in the rotation shaft 13.

  The refrigerant sucked from the refrigerant suction pipe 2 is guided to the compression chamber 15 through the suction port 15a. The compression chamber 15 moves from the outer peripheral side toward the center while reducing its volume, and the refrigerant that has reached a predetermined pressure in the compression chamber 15 is discharged from the discharge port 14 provided in the center of the fixed scroll 11 to the discharge chamber 6. Is ejected. The discharge port 14 is provided with a discharge reed valve (not shown). The refrigerant which has reached a predetermined pressure in the compression chamber 15 is discharged into the discharge chamber 6 by pushing the discharge reed valve open. The refrigerant discharged into the discharge chamber 6 is led out to the upper part inside the closed container 1, passes through a refrigerant passage (not shown) formed in the compression mechanism portion 10, reaches the periphery of the electric mechanism portion 20, and is discharged from the refrigerant discharge pipe 3. To be done.

FIG. 2 is an enlarged cross-sectional view of a main part of the compression mechanism part of FIG.
The scroll compressor according to the present embodiment presses the orbiting scroll 12 against the fixed scroll 11 with the boss accommodating portion 32 as the high pressure area A and the outer peripheral portion of the orbiting scroll 12 in which the rotation restraining member 17 is arranged as the intermediate pressure area B.
The eccentric shaft 13a is inserted into the boss portion 12c so as to be able to be swiveled via a swivel bearing 13d. An oil groove 13e is formed on the outer peripheral surface of the eccentric shaft 13a.
A ring-shaped seal member 33 is provided on the thrust surface of the main bearing 30 that receives the thrust force of the orbiting scroll end plate 12a. The seal member 33 is arranged on the outer periphery of the boss accommodating portion 32.
The closed container 1 is filled with the same high-pressure refrigerant as the refrigerant discharged into the discharge chamber 6, and the rotary shaft oil supply hole 13c is opened at the upper end of the eccentric shaft 13a. The high-pressure area A is equivalent to
The lubricating oil introduced into the boss portion 12c through the rotary shaft oil supply hole 13c is supplied to the orbiting bearing 13d and the boss accommodating portion 32 by the oil groove 13e formed on the outer peripheral surface of the eccentric shaft 13a. Since the seal member 33 is provided on the outer periphery of the boss accommodating portion 32, the boss accommodating portion 32 becomes the high pressure area A.

The fixed scroll end plate 11a is provided with an intermediate pressure extraction hole 41 for extracting the intermediate pressure of the compression chamber 15, and an end plate side intermediate pressure communication passage 42a communicating with the intermediate pressure extraction hole 41.
The outer peripheral wall portion 11c of the fixed scroll 11 is provided with a peripheral wall-side intermediate pressure communication passage 42b that connects the end plate-side intermediate pressure communication passage 42a and the intermediate pressure region B.
The end plate side intermediate pressure communication passage 42a and the peripheral wall side intermediate pressure communication passage 42b form the intermediate pressure communication passage 42. The intermediate pressure communication passage 42 is formed in the fixed scroll 11 and connects the intermediate pressure extraction hole 41 and the intermediate pressure region B.
In this way, by forming the intermediate pressure communication passage 42 that communicates the intermediate pressure extraction hole 41 and the intermediate pressure region B in the fixed scroll 11 and guiding the intermediate pressure of the compression chamber 15 to the intermediate pressure region B, particularly low compression is achieved. Under the ratio condition, the orbiting scroll 12 can be prevented from separating from the fixed scroll 11, and the airtightness of the compression chamber 15 can be enhanced.

In the orbiting scroll end plate 12a, a first oil introduction hole 51 formed in the boss portion 12c, a first oil lead-out hole 52 formed in the outer periphery of the wrap side end face, a first oil introduction hole 51, and a first oil lead-out hole. A first end plate oil communication passage 53 communicating with 52 is provided.
Further, in the orbiting scroll end plate 12a, a second oil introducing hole 61 opening in the intermediate pressure region B, a second oil introducing hole 62 opening in a low pressure space of the compression chamber 15, a second oil introducing hole 61 and a second oil introducing hole 61 are formed. A second end plate oil communication passage 63 that communicates with the oil lead-out hole 62 is provided. The second oil introduction hole 61 is formed on the side surface of the orbiting scroll end plate 12a.

FIG. 3 is a plan view of the fixed scroll and the orbiting scroll shown in FIGS. 1 and 2.
FIG. 3A is a plan view of the fixed scroll according to the present embodiment as viewed from the fixed spiral wrap side, and FIG. 3B is a plan view of the orbiting scroll according to the present embodiment as viewed from the swirl spiral wrap side.
In FIG. 3A, the intermediate pressure region B is shown by a gray zone. As shown, the intermediate pressure region B is formed on the outer circumference of the fixed spiral wrap 11b. As shown in FIG. 4A, a recess 11d is formed around the opening of the peripheral wall side intermediate pressure communication passage 42b to the intermediate pressure region B.
The fixed scroll 11 is provided with a fixed scroll sliding surface 11e that slides on the orbiting scroll end plate 12a located on the outer periphery of the orbiting spiral wrap 12b shown in FIG. 3 (b). The intermediate pressure region B is formed on the outer periphery of the fixed scroll sliding surface 11e.
The fixed scroll sliding surface 11e is provided with a sliding surface groove 54 communicating with the intermediate pressure region B.
As shown in FIG. 3B, the first oil lead-out hole 52 and the second oil lead-out hole 62 open on the outer circumference of the wrap side end surface of the orbiting scroll end plate 12a.

FIG. 4 is an explanatory diagram showing the operation of supplying the lubricating oil in the boss portion to the intermediate pressure region.
4A is a plan view showing a state in which the fixed scroll shown in FIG. 3A is engaged with the orbiting scroll shown in FIG. 3B, and FIG. 4B is the state shown in FIG. 4A. FIG. 4C is a plan view showing a state of the orbiting scroll and the eccentric shaft, and FIG. 4C is an enlarged plan view of a main part of FIG.
As shown in FIG. 4, at the rotational position where the eccentric shaft center C of the eccentric shaft 13 a is closest to the sliding surface groove 54, the first oil lead-out hole 52 and the sliding surface groove 54 communicate with each other.
The eccentric shaft center C of the eccentric shaft 13a rotates around a rotation shaft center D of the rotary shaft 13 as a locus E. The first oil lead-out hole 52 rotates like a locus F, similar to the locus E of the eccentric shaft center C.
Therefore, the first oil outlet hole 52 communicates with the sliding surface groove 54 at the rotational position where the eccentric shaft center C of the eccentric shaft 13a is closest to the sliding surface groove 54, and does not communicate with other positions.
As shown in FIG. 1, the lubricating oil stored in the oil storage portion 4 is introduced into the boss portion 12c through the rotary shaft oil supply hole 13c. Then, as shown in FIG. 4, the lubricating oil introduced into the boss portion 12 c is introduced into the sliding surface groove 54 through the first end plate oil communication passage 53, and the lubricating oil introduced into the sliding surface groove 54. The oil is intermittently introduced into the intermediate pressure region B.

According to the scroll compressor of this embodiment, since the high pressure area A and the intermediate pressure area B are formed and the orbiting scroll 12 is pressed against the fixed scroll 11, the wrap side end surface of the orbiting scroll end plate 12a and the fixed scroll sliding surface 11e. And can maintain a close contact state without separating. Therefore, the oil amount can be adjusted by the first oil outlet hole 52 and the sliding surface groove 54, and the oil amount can be easily adjusted.
Further, according to the scroll compressor of the present embodiment, at the rotational position where the eccentric shaft center C of the eccentric shaft 13a is closest to the sliding surface groove 54, the maximum centrifugal force is exerted on the lubricating oil present in the boss portion 12c. Therefore, the first oil lead-out hole 52 and the sliding surface groove 54 are made to communicate with each other at the timing when the maximum centrifugal force is applied to the lubricating oil existing in the boss portion 12c, so that the sliding surface groove 54 can be reliably connected. Lubricating oil can be introduced.

FIG. 5 is an explanatory diagram showing an operation of leading the lubricating oil in the intermediate pressure region to the compression chamber.
5A is a plan view in which the position of the orbiting scroll is different from that of FIG. 4A in the same state as that of FIG. 4A, and FIG. 5B is an enlarged main part of FIG. 5A. The top view is shown.
The second oil lead-out hole 62 shown in FIG. 5 rotates like a locus G similar to the locus E of the eccentric shaft center C shown in FIG.
In the state shown in FIG. 5, the second oil lead-out hole 62 communicates with the low pressure space of the compression chamber 15. Therefore, the lubricating oil in the intermediate pressure region B is introduced from the second oil introducing hole 61, passes through the second end plate oil communication passage 63, and is introduced from the second oil outlet hole 62 into the low pressure space of the compression chamber 15. In addition, in a state other than that shown in FIG. 5, the second oil lead-out hole 62 is closed by the fixed scroll sliding surface 11e. Therefore, the lubricating oil in the intermediate pressure region B is intermittently introduced into the low pressure space of the compression chamber 15.
According to the scroll compressor of the present embodiment, the lubricating oil introduced into the intermediate pressure region B is guided to the low pressure space of the compression chamber 15, whereby the lubricating oil in the intermediate pressure region B can be circulated and the intermediate pressure region B can be circulated. It is possible to prevent oil deterioration due to insufficient oil supply in the region B and retention of lubricating oil.

FIG. 6 is an explanatory diagram showing a positional relationship between an oil supply path and a seal member associated with the orbiting motion of the scroll compressor.
FIG. 6 shows a state in which the orbiting scroll 12 is engaged with the fixed scroll 11 and viewed from the rear surface of the orbiting scroll 12. 6 (b) is a state in which the rotation is advanced by 90 degrees from FIG. 6 (a), FIG. 6 (c) is a state in which the rotation is further advanced by 90 degrees from FIG. 6 (b), and FIG. The state where the rotation further advances by 90 degrees from FIG. 6C is shown.
As the compression chamber 15 formed by the fixed scroll 11 and the orbiting scroll 12, a first compression chamber 15A is formed on the outer wall side of the orbiting spiral wrap 12b, and a second compression chamber 15B is formed on the inner wall side of the orbiting spiral wrap 12b. It is formed.
As shown in FIG. 6, in the state where the fixed scroll 11 and the orbiting scroll 12 are engaged with each other, the outer peripheral end portion 11be of the fixed spiral wrap 11b is extended to be equal to the outer peripheral end portion 12be of the orbiting spiral wrap 12b. The position of confining the refrigerant in the compression chamber 15A and the position of confining the refrigerant in the second compression chamber 15B are shifted by about 180 degrees.

The state shown in FIG. 6A is the position where the refrigerant in the first compression chamber 15A is confined, and the state shown in FIG. 6C is the position where the refrigerant is confined in the second compression chamber 15B.
In the state shown in FIG. 6A, three first compression chambers 15A are formed, and the first compression chamber 15A1 located at the outermost periphery is in a low pressure state immediately after confining the refrigerant, and the first compression chamber 15A1. The first compression chamber 15A2 formed on the inner circumference side is in an intermediate pressure state, and the first compression chamber 15A3 formed further on the inner circumference side of the first compression chamber 15A2 is in a high pressure state before discharge. The reference numeral of the second compression chamber 15B is omitted in FIG. 6 (a).
In the state shown in FIG. 6C, three second compression chambers 15B are formed, and the second compression chamber 15B1 located at the outermost periphery is in a low pressure state immediately after confining the refrigerant, and the second compression chamber 15B1. The second compression chamber 15B2 formed on the inner circumference side is in an intermediate pressure state, and the second compression chamber 15B3 formed further on the inner circumference side of the second compression chamber 15B2 is in a discharge state and in a high pressure state.
The first compression chamber 15A1 shown in FIG. 6 (a) is the suction volume of the first compression chamber 15A, and the second compression chamber 15B1 shown in FIG. 6 (c) is the suction volume of the second compression chamber 15B. The suction volume of the first compression chamber 15A is made larger than the suction volume of the second compression chamber 15B by shifting the position of confining the refrigerant in the compression chamber 15A and the position of confining the refrigerant in the second compression chamber 15B by 180 degrees. .

The intermediate pressure take-out hole 41 opens to the first compression chamber 15A2 in the intermediate pressure state as shown in FIG. 6 (a) and to the second compression chamber 15B2 in the intermediate pressure state as shown in FIG. 6 (c). It is open. By arranging the intermediate pressure take-out hole 41 at the center between the pitches of the fixed spiral wrap 11b in the intermediate pressure state, the first compression chamber 15A2 in the intermediate pressure state and the second compression chamber 15B2 in the intermediate pressure state are evenly arranged. Can be opened.
At the position shown in FIG. 6B, the second oil lead-out hole 62 opens into the first compression chamber 15A1 in the constant pressure state.
As shown in FIG. 6, by shifting the timing of confining the refrigerant between the first compression chamber 15A and the second compression chamber 15B by about 180 degrees, the suction volume can be maximized and the wrap height can be set low.

FIG. 7 is a graph showing the pressure fluctuation of the intermediate pressure taken out from the intermediate pressure take-out hole in the scroll compressor of the present embodiment, and FIGS. 8 and 9 show the intermediate pressure taken out from the intermediate pressure take-out hole in the scroll compressor as a comparative example. It is a graph which shows pressure fluctuation.
That is, FIG. 7 shows the intermediate pressure taken out from the intermediate pressure extraction hole when the intermediate pressure communication passage is provided in the fixed scroll in the asymmetric scroll compressor in which the suction volume of the first compression chamber and the suction volume of the second compression chamber are different. It shows the pressure fluctuation range.
FIG. 8 shows the pressure fluctuation of the intermediate pressure taken out from the intermediate pressure extraction hole when the intermediate pressure communication passage is provided in the fixed scroll in the asymmetric scroll compressor in which the suction volume of the first compression chamber and the suction volume of the second compression chamber are different. Shows the width.
FIG. 9 is a symmetric scroll compressor in which the suction volume of the first compression chamber and the suction volume of the second compression chamber are the same, and is taken out from the intermediate pressure extraction hole when the fixed scroll or the orbiting scroll is provided with the intermediate pressure communication passage. The pressure fluctuation range of the intermediate pressure is shown.

7 to 9, the horizontal axis represents the crank angle and the vertical axis represents the pressure in the compression chamber.
In the figure, a curve H shows the pressure fluctuation in the first compression chamber, and a curve J shows the pressure fluctuation in the second compression chamber.
As shown in FIG. 7, the asymmetric scroll compressor shown in FIG. 8 is provided by providing the fixed scroll with the intermediate pressure take-out hole in the asymmetric scroll compressor having different suction volumes of the first compression chamber and the second compression chamber. In comparison with the case where the intermediate pressure take-out hole is provided in the orbiting scroll and the case where the intermediate pressure take-out hole is provided in the orbiting scroll or the fixed scroll in the symmetrical scroll compressor shown in FIG. Can be made smaller. Therefore, the pulsation in the intermediate pressure region can be reduced, and the orbiting scroll can be stably pressed against the fixed scroll.

10 is a vertical cross-sectional view of a scroll compressor according to another embodiment of the present invention, and FIG. 11 is an enlarged cross-sectional view of a main part of the compression mechanism portion of FIG. The same members as those in the above embodiment are designated by the same reference numerals and the description thereof will be omitted.
In the present embodiment, the fixed scroll 11 is formed with a high pressure communication passage 71 that communicates the intermediate pressure extraction hole 41 with the high pressure space in the closed container 1, and a balance valve 73 is provided in the high pressure opening 72 of the high pressure communication passage 71. It is provided.
According to the present embodiment, particularly under a low compression ratio condition, the balance valve 73 is opened when the intermediate pressure during the compression of the compression chamber 15 becomes too high, so that the intermediate pressure during the compression of the compression chamber 15 becomes a predetermined pressure. The compression ratio under the low compression ratio condition in which the orbiting scroll 12 is separated from the fixed scroll 11 can be reduced.

  As the refrigerant of the present invention, R32, carbon dioxide, or a refrigerant having a double bond between carbons can be used.

  INDUSTRIAL APPLICABILITY The scroll compressor of the present invention is useful for a refrigeration cycle device such as a hot water heater, an air conditioner, a water heater, or a refrigerator.

1 Airtight Container 2 Refrigerant Suction Pipe 3 Refrigerant Discharge Pipe 4 Oil Storage 5 Oil Pump 6 Discharge Chamber 10 Compression Mechanism 11 Fixed Scroll 12 Orbiting Scroll 13 Rotating Shaft 13a Eccentric Shaft 13b Lower End 13c Rotating Shaft Oil Supply Hole 13d Slewing Bearing 13e Oil Groove 14 Discharge port 15 Compression chamber 15A First compression chamber 15B Second compression chamber 16 Bolt 17 Rotation restraint member 18 Sub bearing 20 Electric mechanism 21 Stator 22 Rotor 30 Main bearing 31 Bearing 32 boss accommodating portion 41 Intermediate pressure outlet 42 Intermediate pressure communication passage 51 First oil introduction hole 52 First oil discharge hole 53 First end plate oil communication passage 61 Second oil introduction hole 62 Second oil discharge hole 63 Second end plate oil communication passage 71 High pressure communication passage 72 High pressure opening 73 Balance valve

Claims (4)

In the closed container, a compression mechanism section for compressing a refrigerant and an electric mechanism section for driving the compression mechanism section are arranged,
The compression mechanism unit has a fixed scroll, an orbiting scroll, and a rotary shaft that orbitally drives the orbiting scroll,
The fixed scroll includes a disk-shaped fixed scroll end plate and a fixed spiral wrap standing on the fixed scroll end plate,
The orbiting scroll comprises a disk-shaped orbiting scroll end plate, an orbiting spiral wrap standing on the wrap side end face of the orbiting scroll end plate, and a boss portion formed on the non-wrap side end face of the orbiting scroll end plate,
An eccentric shaft that is inserted into the boss portion is formed at the upper end of the rotating shaft,
The fixed spiral wrap and the swirl spiral wrap are meshed with each other, and a plurality of compression chambers are formed between the fixed spiral wrap and the swirl spiral wrap,
As the compression chamber,
A first compression chamber is formed on the outer wall side of the swirl spiral wrap, and a second compression chamber is formed on the inner wall side of the swirl spiral wrap;
Making the suction volume of the first compression chamber larger than the suction volume of the second compression chamber,
A main bearing that supports the fixed scroll and the orbiting scroll is provided below the fixed scroll and the orbiting scroll,
The main bearing is formed with a bearing portion that pivotally supports the rotating shaft, and a boss accommodating portion that accommodates the boss portion,
Between the fixed scroll and the main bearing, a rotation restraint member that restrains rotation of the orbiting scroll is provided,
A scroll compressor for pressing the orbiting scroll against the fixed scroll, wherein the boss accommodating portion is a high pressure area, and the outer peripheral portion of the orbiting scroll in which the rotation restraining member is arranged is an intermediate pressure area.
The fixed scroll end plate is provided with an intermediate pressure extraction hole for extracting the intermediate pressure of the compression chamber,
In the fixed scroll, an intermediate pressure communication passage that connects the intermediate pressure extraction hole and the intermediate pressure region is formed,
In the fixed scroll, a high-pressure communication passage that connects the intermediate pressure extraction hole and the high-pressure space in the closed container is formed,
A scroll compressor, wherein a balance valve is provided at a high pressure opening of the high pressure communication passage. An oil storage portion for storing lubricating oil is formed at the bottom of the closed container,
A rotation shaft oil supply hole is formed in the rotation shaft from the lower end of the rotation shaft to the eccentric shaft,
The orbiting scroll end plate has a first oil introduction hole formed in the boss portion, a first oil lead-out hole formed on the outer periphery of the wrap side end surface, the first oil introduction hole, and the first oil lead-out hole. And a first end plate oil communication passage communicating with
The fixed scroll is provided with a fixed scroll sliding surface that slides with the orbiting scroll end plate located on the outer periphery of the orbiting spiral wrap,
The intermediate pressure region is formed on the outer periphery of the fixed scroll sliding surface,
The fixed scroll sliding surface is provided with a sliding surface groove communicating with the intermediate pressure region,
The lubricating oil stored in the oil storage portion is introduced into the boss portion through the rotary shaft oil supply hole,
The lubricating oil introduced into the boss portion is introduced into the sliding surface groove through the first end plate oil communication passage,
The scroll compressor according to claim 1, wherein the lubricating oil introduced into the sliding surface groove is introduced into the intermediate pressure region. The scroll compression according to claim 2, wherein the first oil lead-out hole and the sliding surface groove communicate with each other at a rotational position where the center of the eccentric shaft of the eccentric shaft is closest to the sliding surface groove. Machine. In the orbiting scroll end plate, a second oil introducing hole opening in the intermediate pressure region, a second oil introducing hole opening in a low pressure space of the compression chamber, the second oil introducing hole and the second oil introducing hole. And a second end plate oil communication passage communicating with
4. The scroll according to claim 2, wherein the lubricating oil introduced into the intermediate pressure region is introduced into the low pressure space of the compression chamber through the second end plate oil communication passage. Compressor.