Rotary compressor

Abstract

A rotary compressor according to the present invention is provided with: a rotary shaft rotatable about an axis; a cylinder in which a compression chamber for compressing the refrigerant in accordance with rotation of the rotating shaft is formed; a bearing part which is provided to the cylinder and rotatably supports the rotating shaft; and an injection part which is formed on the bearing part and can supply the refrigerant into the compression chamber. The injection unit has: a port through which a refrigerant supplied from the outside flows; an intermediate pressure chamber extending in the circumferential direction of the rotating shaft and into which a refrigerant is introduced from a port; a check valve which is provided in the intermediate pressure chamber and which prevents the refrigerant in the intermediate pressure chamber from flowing back to the port; and a plurality of injection holes that communicate the intermediate pressure chamber and the compression chamber.

Description

Technical Field

[0001] The invention relates to a rotary compressor.

[0002] This application claims priority based on patent application No. 2022-124761 filed in Japan on August 4, 2022, and the contents are incorporated herein by reference. Background Art

[0003] For example, Patent Document 1 discloses a twin-rotor compressor that supplies injection refrigerant to each of a first compression chamber and a second compression chamber through an injection flow path.

[0004] In the injection flow path, the injection refrigerant is supplied to the first compression chamber through the first injection pipe connected to the injection muffler and the holes formed in the upper bearing (the first common hole, the first injection hole connected thereto, and the second injection hole). In addition, the injection refrigerant is supplied to the second compression chamber through the second injection pipe connected to the injection muffler and the holes formed in the lower bearing (the second common hole, the third injection hole connected thereto, and the fourth injection hole).

[0005] The injection muffler is configured to prevent the refrigerant from flowing back from the compression chamber through the hole of the bearing when the refrigerant is compressed in each compression chamber by connecting the first compression chamber and the second compression chamber without generating a pressure difference, thereby enabling a larger flow of injection refrigerant to flow into the compression chamber.

[0006] Previous technical literature

[0007] Patent Literature

[0008] Patent Document 1: International Publication No. 2020 / 031248 Summary of the invention

[0009] Technical issues to be solved by the invention

[0010] When the compression chamber is a rotary compressor, a check valve or the like is sometimes arranged in the supply flow path of the injection refrigerant in order to suppress the backflow of the injection refrigerant from the compression chamber. At this time, the refrigerant in the interval from the compression chamber to the check valve in the supply flow path is not compressed in the compression chamber, so the interval becomes a dead volume that reduces the efficiency of the compressor.

[0011] In order to reduce the dead volume that causes the compression efficiency to decrease, it is currently difficult to arrange a check valve inside a hole formed in a bearing, for example, because the hole is a narrow space. Therefore, there is a problem that a check valve has to be arranged in a supply flow path connected to the hole of the bearing from the outside.

[0012] Furthermore, in the technology described in the above-mentioned Patent Document 1, the common holes (the first common hole and the second common hole) are formed in a straight line. Therefore, when the number of injection holes (the first injection hole, the second injection hole, the third injection hole, and the fourth injection hole) is increased for the purpose of increasing the flow rate, there is a problem that the arrangement of the holes is limited to a straight line.

[0013] The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotary compressor capable of suppressing the generation of dead volume and arranging injection holes with a high degree of freedom.

[0014] Means for solving technical problems

[0015] In order to solve the above-mentioned problems, the rotary compressor involved in the present invention comprises: a rotating shaft, which can rotate around an axis line; a cylinder, which forms a compression chamber for compressing refrigerant as the rotating shaft rotates; a bearing portion, which is arranged in the cylinder and supports the rotating shaft so as to be rotatable; and an injection portion, which is formed in the bearing portion and can supply refrigerant into the compression chamber, and the injection portion has: a port for the refrigerant supplied from the outside to flow; an intermediate pressure chamber, which extends along the circumferential direction of the rotating shaft and into which the refrigerant is introduced; a check valve, which is arranged in the intermediate pressure chamber and prevents the refrigerant in the intermediate pressure chamber from flowing back to the port; and a plurality of injection holes, which connect the intermediate pressure chamber with the compression chamber.

[0016] Effects of the Invention

[0017] According to the present invention, it is possible to provide a rotary compressor capable of suppressing the generation of a dead volume and arranging injection holes with a high degree of freedom. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a longitudinal sectional view for explaining the structure of the rotary compressor according to the first embodiment of the present invention.

[0019] Figure 2 Yes Figure 1 The main part of the figure is enlarged.

[0020] Figure 3 It means cross-sectional observation Figure 2 Diagram of the III-III line direction.

[0021] Figure 4 is a longitudinal sectional view for explaining the structure of a rotary compressor according to a second embodiment of the present invention, Figure 2 The corresponding part. DETAILED DESCRIPTION

[0022] Hereinafter, a mode for implementing the rotary compressor of the present invention will be described with reference to the drawings.

[0023] <First Embodiment>

[0024] The rotary compressor is, for example, a sealed electric rotary compressor used in an air conditioner or a refrigeration device.

[0025] like Figure 1 As shown, the rotary compressor 100 includes a compressor body 1 , an injection portion 2 , an injection pipe 3 , an accumulator 4 , a suction pipe 5 , a discharge pipe 6 , and a leg portion 7 .

[0026] Hereinafter, the rotary compressor 100 will be simply referred to as “compressor 100 ”.

[0027] The refrigerant compressed in the compressor 100 may be, for example, an HFO (hydrofluoroolefin) refrigerant such as R32, R454C, or a natural refrigerant such as C02, propane, or helium.

[0028] (Compressor body)

[0029] The compressor body 1 compresses refrigerant supplied from the outside.

[0030] The compressor body 1 includes a housing 10 , a rotary shaft 11 , a rotary compression unit 12 , a bearing unit 13 , and an electric motor 14 .

[0031] (case)

[0032] When the housing 10 is installed on a floor or ground, the housing 10 is arranged along the vertical direction Dv ( Figure 1 The housing 10 is a pressure vessel extending in the vertical direction (in the up-down direction). The housing 10 constitutes the outer shell of the compressor body 1. Hereinafter, for convenience of explanation, the upper side in the vertical direction Dv is referred to as "upper side Dvu", and the lower side in the vertical direction Dv is referred to as "lower side Dvd".

[0033] The casing 10 includes a main body 10a, an upper cover 10b, a lower cover 10c, a refrigerant introduction portion 10d, and a suction port 10e.

[0034] The main body 10a has a cylindrical shape extending in the vertical direction Dv. Therefore, the main body 10a has openings on the upper side Dvu and the lower side Dvd.

[0035] The upper cover 10b is provided on the main body 10a so as to seal the opening on the upper side Dvu of the main body 10a from the upper side Dvu.

[0036] The lower cover 10c is provided on the main body 10a so as to seal the opening of the lower side Dvd in the main body 10a from the lower side Dvd. In addition, the lower cover 10c is provided with a leg 7, and the entire housing 10 is supported by the leg 7.

[0037] The refrigerant introduction portion 10d is a hole for introducing the refrigerant from the outside into the inside of the main body portion 10a.

[0038] The refrigerant introduction portion 10d includes a side opening 101d formed so as to penetrate the main body 10a in the thickness direction of the main body 10a, and a cylindrical portion 102d arranged inside the side opening 101d.

[0039] The side opening 101d has a circular opening shape. The side opening 101d is disposed in the lower side Dvd portion of the main body 10a. The cylindrical portion 102d is fitted into the side opening 101d without a gap, and extends from the side opening 101d toward the outside of the main body 10a.

[0040] The suction port 10e is a syringe-shaped component disposed inside the cylindrical portion 102d of the refrigerant inlet 10d. The suction port 10e is embedded in the cylindrical portion 102d without a gap. The front end of the suction port 10e extends further toward the inside of the main body 10a than the cylindrical portion 102d. In addition, the rear end of the suction port 10e is, for example, in the same plane as the opening portion of the cylindrical portion 102d.

[0041] Here, an accumulator 4 for separating the refrigerant into gas and liquid before supplying the refrigerant to the compressor body 1 is arranged outside the housing 10. The accumulator 4 is fixed to a main body portion 10a in the housing 10 via a bracket Br, for example.

[0042] The refrigerant in the accumulator 4 is guided to the inside of the casing 10 through the suction pipe 5 connecting the accumulator 4 and the suction port 10e. One end of the suction pipe 5 extends in the accumulator 4. The other end of the suction pipe 5 is inserted into the suction port 10e.

[0043] (rotation axis)

[0044] The rotating shaft 11 is accommodated in the housing 10. The rotating shaft 11 can rotate around the axis O extending along the vertical direction Dv. Hereinafter, for the convenience of explanation, the extending direction of the axis O as the center of the rotating shaft 11 is referred to as the axis direction Da. In addition, one side Dau on the axis direction Da is referred to as "one side Dau", and the other side Dad on the axis direction Da is referred to as "the other side Dad". The axis direction Da in this embodiment is consistent with the vertical direction Dv, one side Dau is consistent with the upper side Dvu, and the other side Dad is consistent with the lower side Dvd.

[0045] (Rotation compression unit)

[0046] The rotary compression unit 12 is accommodated in the housing 10 and compresses the refrigerant introduced through the refrigerant introduction portion 10d. The rotary compression unit 12 is disposed in a portion on the lower side Dvd in the main body portion 10a of the housing 10.

[0047] The rotary compression unit 12 includes a cylinder 121, an eccentric shaft 122, a piston rotor 123, and a vane 124 (see Figure 3 ).

[0048] The cylinder 121 is a member that is annular and extends in the axial direction Da when accommodated in the housing 10. The cylinder 121 is fixed to a portion on the lower side Dvd of the inner circumferential surface of the main body 10a of the housing 10. The space inside the cylinder 121 defined by the inner circumferential surface of the cylinder 121 is set as a compression chamber 121a for compressing refrigerant. That is, a cylindrical compression chamber 121a extending in the axial direction Da is formed in the cylinder 121.

[0049] In addition, the cylinder 121 is provided with a suction hole 121b extending from the inner peripheral surface to the outer peripheral surface of the cylinder 121. The front end of the suction port 10e of the refrigerant inlet 10d is inserted into the suction hole 121b without a gap. Therefore, the refrigerant is introduced into the compression chamber 121a through the suction port 10e. In addition, the cylinder 121 is provided with a blade groove 121c (see FIG. 121c ) extending from the inner peripheral surface to the outer peripheral surface and having a blade 124 disposed inside. Figure 3 ).

[0050] The eccentric shaft portion 122 is a cylindrical member provided integrally with the rotating shaft 11 at the lower end of the rotating shaft 11. The eccentric shaft portion 122 is arranged at a position offset from the axis O as the center of the rotating shaft 11 in a direction orthogonal to the axis O in the compression chamber 121a.

[0051] The piston rotor 123 is a cylindrical member having an outer diameter smaller than the inner diameter of the cylinder 121. The piston rotor 123 extends in the axial direction Da. The piston rotor 123 is provided on the eccentric shaft portion 122. Inside the piston rotor 123, the eccentric shaft portion 122 is integrally configured with the piston rotor 123. The piston rotor 123 rotates together with the eccentric shaft portion 122 in a state of being eccentric with respect to the axis O as the rotating shaft 11 rotates.

[0052] like Figure 3 As shown, the blade 124 is a plate-shaped member disposed in the cylinder groove 121c formed in the cylinder 121. The blade 124 is guided to be slidable on the inner surface of the blade groove 121c and is held to be able to move forward and backward in the radial direction of the rotating shaft 11.

[0053] The vane 124 is elastically pressed radially inwardly of the rotating shaft 11 by a compression spring (not shown) disposed in the vane groove 121c. The vane 124 is pressed by the compression spring during operation of the compressor 100, so that the inner end in the radial direction always contacts the outer peripheral surface of the piston rotor 123.

[0054] Here, the eccentric shaft portion 122 has an outer diameter slightly smaller than the inner diameter of the piston rotor 123. Therefore, when the rotating shaft 11 rotates, the eccentric shaft portion 122 rotates around the axis O, and the piston rotor 123 rolls eccentrically in the compression chamber 121a of the cylinder 121. When the blade 124 moves radially along with the eccentric rolling of the piston rotor 123, the blade 124 contacts the piston rotor 123. Since the blade 124 contacts the piston rotor 123, the blade 124 and the piston rotor 123 divide the compression chamber 121a into two areas.

[0055] Hereinafter, the position of the piston rotor 123 when the vane 124 is entirely accommodated in the vane groove 121c is referred to as the "initial position". That is, in the initial position, the vane 124 is in a state of not advancing into the compression chamber 121a. Furthermore, in the present embodiment, the phase angle of the piston rotor 123 at the initial position relative to the axis O is set to 0°. That is, as the piston rotor 123 rolls eccentrically with the rotation of the rotating shaft 11, the phase angle of the piston rotor 123 relative to the axis O changes in the range of 0° to 360° in the counterclockwise direction when viewed from the upper side Dvu with the axis O as the center.

[0056] When the refrigerant supplied from the suction port 10e of the refrigerant introduction portion 10d is introduced into the compression chamber 121a, the volume of one of the two regions in the compression chamber 121a divided by the piston rotor 123 and the vane 124 gradually decreases due to the eccentric rolling of the piston rotor 123. As a result, the refrigerant in one region is gradually compressed.

[0057] (Bearing part)

[0058] like Figure 1 and Figure 2 As shown, the bearing 13 rotatably supports the rotary shaft 11 in the housing 10. The bearing 13 is provided on the cylinder 121, and a pair of bearings 13 are arranged so as to sandwich the cylinder 121 from the axial direction Da.

[0059] Hereinafter, the bearing portion 13 arranged on the one side Dau (upper side Dvu) of the cylinder 121 among the pair of bearing portions 13 is referred to as the "upper bearing 131", and the bearing portion 13 arranged on the other side Dad (lower side Dvd) of the cylinder 121 is referred to as the "lower bearing 132".

[0060] like Figure 2 As shown, the upper bearing 131 is fixed to the cylinder 121 from one side Dau in a state where it slidably surrounds the rotating shaft 11 from the outer peripheral side.

[0061] The upper bearing 131 in the present embodiment includes a first cylindrical portion 131 c and a first flange portion 131 d .

[0062] The first cylindrical portion 131e has a cylindrical shape extending in the axial direction Da when the bearing portion 13 is provided in the cylinder 121. The first cylindrical portion 131c slidably surrounds the rotary shaft 11 from the outer peripheral side.

[0063] The first flange portion 131d is a component that extends from the first cylinder portion 131c in the radial direction of the rotating shaft 11 while being integrated with the first cylinder portion 131c. The first flange portion 131d is arranged at a portion of the first cylinder portion 131c on the other side Dad. The first flange portion 131d is annular when viewed from the axial direction Da. The first flange portion 131d is fixed to a surface of the cylinder 121 facing one side Dau by a fastening portion such as a bolt.

[0064] The lower bearing 132 is fixed to the cylinder 121 from the other side Dad in a state where it slidably surrounds the rotating shaft 11 from the outer peripheral side.

[0065] The lower bearing 132 in the present embodiment includes a lower bearing body 132a and a lower bearing cover portion 132b.

[0066] The lower bearing body 132a has a second cylindrical portion 132c and a second flange portion 132d.

[0067] The second cylindrical portion 132c has a cylindrical shape extending in the axial direction Da when the bearing portion 13 is provided in the cylinder 121. The second cylindrical portion 132c slidably surrounds the rotating shaft 11 from the outer peripheral side.

[0068] The second flange portion 132d is a member extending from the second cylindrical portion 132c in the radial direction of the rotary shaft 11 in a state of being integrated with the second cylindrical portion 132c. The second flange portion 132d is fixed to the surface of the cylinder 121 facing the other side Dad by a fastening portion such as a bolt.

[0069] The second flange portion 132d is disposed on a portion of one side Dau in the second cylinder portion 132c. The second flange portion 132d is annular when viewed from the axial direction Da. A recess 132f is formed on the surface of the second flange portion 132d facing the other side Dad, which is recessed toward the one side Dau and extends in the circumferential direction of the rotating shaft 11.

[0070] The lower bearing cover 132b is provided on the surface of the second flange 132d facing the other side Dad so as to close the recess 132f formed on the second flange 132d from the other side Dad. The lower bearing cover 132b is provided on the second flange 132d so as to surround the second cylinder 132c from the outer peripheral side. The lower bearing cover 132b can be attached and detached relative to the second flange 132d. The lower bearing cover 132b is fixed to the second flange 132d by a fastening part such as a bolt, for example.

[0071] Here, discharge holes 131e, 132e for discharging the compressed refrigerant into the space in the shell 10 are formed on the first flange portion 131d of the upper bearing 131 and the second flange portion 132d of the lower bearing body 132a. Therefore, the discharge holes 131e, 132e connect the compression chamber 121a with the outer space of the rotary compression unit 12 inside the shell 10.

[0072] The discharge hole 131e formed in the first flange portion 131d opens, for example, on the surface facing the other side Dad of the first flange portion 131d and on the outer peripheral surface of the first flange portion 131d. The discharge hole 132e formed in the second flange portion 132d opens, for example, on the surface facing the one side Dau of the second flange portion 132d and on the outer peripheral surface of the second flange portion 132d.

[0073] The openings of the discharge holes 131e and 132e formed on the outer peripheral surface of the first flange portion 131d and the outer peripheral surface of the second flange portion 132d are provided with, for example, reed valves (not shown in the figure) as discharge valves. The refrigerant increased to a predetermined pressure by compression pushes open the reed valves and is discharged to the outside of the bearing portion 13 in the housing 10 through the discharge holes 131e and 132e. The refrigerant discharged from the discharge holes 131e and 132e into the housing 10 is transported to an external device of the compressor 100 through the discharge pipe 6 provided on the upper cover portion 10b of the housing 10.

[0074] The openings of the discharge holes 131e and 132e opened in the compression chamber 121a are arranged, for example, within a range of a phase angle greater than 315° and less than 360° relative to the axis O. Furthermore, the opening of the suction hole 121b opened in the compression chamber 121a is arranged, for example, within a range of a phase angle greater than 0° and less than 45° relative to the axis O.

[0075] (Electric Motor)

[0076] The electric motor 14 is accommodated in the housing 10 and rotates the rotary shaft 11 .

[0077] The electric motor 14 includes a rotor 141 and a stator 142 .

[0078] The rotor 141 is a rotating member fixed to the rotating shaft 11 in a manner of surrounding the rotating shaft 11 from the outer circumference side at the upper side Dvu of the rotary compression unit 12. The stator 142 is a fixing member fixed to the inner surface of the main body 10a of the housing 10 in a manner of surrounding the rotor 141 from the outer circumference side. A power supply (not shown) for supplying power is connected to the stator 142. The electric motor 14 rotates the rotating shaft 11 by the power supplied from the power supply.

[0079] (Injection part)

[0080] The injection portion 2 is independent of the refrigerant introduction portion 10d, and supplies the refrigerant from the outside into the compression chamber 121a of the cylinder 121. The injection portion 2 is formed in the lower bearing 132 of the bearing portion 13.

[0081] The injection unit 2 in the present embodiment includes a port 21 , an intermediate pressure chamber 22 , a check valve 23 , and an injection hole 24 .

[0082] (port)

[0083] The port 21 is a hole formed in the second flange portion 132d of the lower bearing 132. The port 21 extends from the outer peripheral surface of the second flange portion 132d to the inner surface of the recessed portion 132f formed in the second flange portion 132d. Therefore, the port 21 opens at the outer peripheral surface of the second flange portion 132d and the inner surface of the recessed portion 132f.

[0084] Here, the injection pipe 3 for supplying refrigerant is connected to the opening of the port 21 formed on the outer peripheral surface of the second flange portion 132d. Therefore, refrigerant from the outside is supplied to the port 21 through the injection pipe 3. The injection pipe 3 penetrates the main body 10a of the shell 10 and is connected to a device (not shown) for supplying injection refrigerant arranged outside the shell 10.

[0085] (Intermediate pressure chamber)

[0086] The intermediate pressure chamber 22 is a chamber formed in the lower bearing 132. The intermediate pressure chamber 22 in this embodiment is the above-mentioned recessed portion 132f formed in the second flange portion 132d. Specifically, the recessed portion 132f formed in the second flange portion 132d is closed by the lower bearing cover portion 132b, thereby defining the intermediate pressure chamber 22. Therefore, by removing the lower bearing cover portion 132b from the lower bearing body 132a, the intermediate pressure chamber 22 is opened. The refrigerant flowing in the port 21 flows into the intermediate pressure chamber 22.

[0087] (Check Valve)

[0088] The check valve 23 is a reed valve provided in the intermediate pressure chamber 22 and is used to prevent the refrigerant flowing into the intermediate pressure chamber 22 from the port 21 from flowing back to the port 21. The check valve 23 is arranged in the intermediate pressure chamber 22 so as to block the opening portion of the port 21 opened in the intermediate pressure chamber 22.

[0089] (Injection hole)

[0090] The injection hole 24 is a hole that connects the intermediate pressure chamber 22 with the compression chamber 121a formed in the cylinder 121. The injection hole 24 extends toward the compression chamber 121a toward the one side Dau from the inner surface facing the other side Dad in the intermediate pressure chamber 22. The injection hole 24 opens on the inner surface of the recessed portion 132f and the surface facing the one side Dau in the second flange portion 132d.

[0091] In this embodiment, a plurality of injection holes 24 are formed. Figure 2 and Figure 3 As shown in FIG. 1 , the plurality of injection holes 24 extend along the axial direction Da and are arranged at equal intervals in the circumferential direction of the rotating shaft 11. Figure 3 As shown, in this embodiment, a case where four injection holes 24 are arranged is shown as an example.

[0092] Here, when the compression chamber 121a is divided into two equal parts, one side where the opening portion of the suction hole 121b is arranged and the other side where the opening portion of the discharge holes 131e and 132e is arranged, the opening portion of the plurality of injection holes 24 is arranged on the side where the opening portion of the discharge holes 131e and 132e is arranged. In the present embodiment, the opening portion of the plurality of injection holes 24 opening in the compression chamber 121a is arranged within a range of, for example, 200° to 300° in phase angle with respect to the axis O.

[0093] And, if Figure 2 As shown, the port 21 and the intermediate pressure chamber 22 of the injection portion 2 and the lower bearing cover portion 132b of the lower bearing 132 are arranged in the order of the port 21, the intermediate pressure chamber 22, and the lower bearing cover portion 132b in the axial direction Da. In other words, the port 21, the intermediate pressure chamber 22, and the lower bearing cover portion 132b are arranged in the order of the port 21, the intermediate pressure chamber 22, and the lower bearing cover portion 132b in the direction away from the compression chamber 121a.

[0094] (Effect)

[0095] In the above structure, the intermediate pressure chamber 22 of the injection unit 2 is formed in the lower bearing 132, so the check valve 23 can be arranged in the intermediate pressure chamber 22. As a result, the length of the flow path of the refrigerant between the compression chamber 121a and the check valve 23 can be shortened compared to, for example, the case where the check valve 23 is arranged in the injection pipe 3 or the like outside the bearing 13. Therefore, the generation of dead volume can be suppressed. In addition, since the intermediate pressure chamber 22 formed in the lower bearing 132 extends in the circumferential direction, the injection hole 24 opened in the compression chamber 121a can be arranged in the circumferential direction. Therefore, the injection hole 24 can be arranged with a high degree of freedom.

[0096] Furthermore, in the above structure, since the plurality of injection holes 24 extend from the intermediate pressure chamber 22 in the axial direction Da, the length of the injection hole 24 can be formed to be the shortest. Thus, the generation of dead volume can be further suppressed. Furthermore, since the plurality of injection holes 24 are formed, the amount of refrigerant that can be supplied to the compression chamber 121a can be increased. Furthermore, since the plurality of injection holes 24 are arranged at equal intervals in the circumferential direction of the rotating shaft 11, the time at which each injection hole 24 opens in the compression chamber 121a can be made consistent during the process of the refrigerant being compressed. Therefore, the efficiency of supplying refrigerant to the compression chamber 121a based on the injection portion 2 can be improved.

[0097] Furthermore, in the above-mentioned structure, since the port 21, the intermediate pressure chamber 22, and the lower bearing cover 132b are arranged in the order of the port 21, the intermediate pressure chamber 22, and the lower bearing cover 132b in the direction away from the compression chamber 121a, when the lower bearing cover 132b is removed from the lower bearing body 132a, the inside of the intermediate pressure chamber 22 can be opened without passing through the port 21. That is, by removing the lower bearing cover 132b, the check valve 23 arranged in the intermediate pressure chamber 22 can be accessed. Therefore, the check valve 23 can be easily maintained without removing the lower bearing 132 from the cylinder 121 or the like.

[0098] <Second Embodiment>

[0099] Next, refer to Figure 4 , a second embodiment of the rotary compressor 100 according to the present invention will be described. In the second embodiment described below, the same components as those of the first embodiment are denoted by the same reference numerals in the drawings and their descriptions are omitted.

[0100] The compressor 100 in the present embodiment is a twin-rotor compressor having two compression chambers 121 a .

[0101] The compressor 100 includes a compressor body 1 , an injection unit 2 , a first injection pipe 31 , a second injection pipe 32 , an accumulator 4 , a first suction pipe 51 , a second suction pipe 52 , a discharge pipe 6 , and a leg 7 .

[0102] The compressor body 1 includes a housing 10 , a rotary shaft 11 , a rotary compression portion 12 a , a bearing portion 13 , and an electric motor 14 .

[0103] The casing 10 includes a body portion 10a, an upper cover portion 10b, a lower cover portion 10c, a first refrigerant introduction portion 10h, a second refrigerant introduction portion 10i, a first suction port 10f, and a second suction port 10g.

[0104] The first refrigerant introduction portion 10h includes a first side opening 101h formed to penetrate the main body 10a in the thickness direction of the main body 10a, and a first cylindrical portion 131c arranged inside the first side opening 101h.

[0105] The first side opening 101h has a circular opening shape, and the first cylindrical portion 102h is fitted into the first side opening 101h without a gap, and extends from the first side opening 101h toward the outside of the main body 10a.

[0106] The first suction port 10f is a syringe-shaped component disposed inside the first cylindrical portion 102h of the first refrigerant inlet 10h. The first suction port 10f is embedded in the first cylindrical portion 102h without a gap. The front end of the first suction port 10f extends further toward the inside of the main body 10a than the first cylindrical portion 102h. In addition, the rear end of the first suction port 10f is, for example, in the same plane as the opening portion of the first cylindrical portion 102h.

[0107] The second refrigerant inlet 10i is arranged on the lower side Dvd (the other side Dad) than the first refrigerant inlet 10h. The second refrigerant inlet 10i has a second side opening 101i formed so as to penetrate the main body 10a in the thickness direction of the main body 10a, and a second cylindrical portion 102i arranged inside the second side opening 101i.

[0108] The second side opening 101i has a circular opening shape, and the second cylindrical portion 102i is fitted into the second side opening 101i without a gap, and extends from the second side opening 101i toward the outside of the main body 10a.

[0109] The second suction port 10g is a syringe-shaped component disposed inside the second cylindrical portion 102i of the second refrigerant inlet portion 10i. The second suction port 10g is embedded in the second cylindrical portion 102i without a gap. The front end of the second suction port 10g extends further toward the inside of the main body 10a than the second cylindrical portion 102i. In addition, the rear end of the second suction port 10g is, for example, in the same plane as the opening portion of the second cylindrical portion 102i.

[0110] The refrigerant in the accumulator 4 is guided to the inside of the shell 10 through the first suction pipe 51 connecting the accumulator 4 and the first suction port 10f, and the second suction pipe 52 connecting the accumulator 4 and the second suction port 10g. One end of the first suction pipe 51 and the second suction pipe 52 extend in the accumulator 4. The other end of the first suction pipe 51 is inserted into the first suction port 10f, and the other end of the second suction pipe 52 is inserted into the second suction port 10g.

[0111] The rotary compression unit 12a includes a first cylinder 120a, a second cylinder 120d, a first eccentric shaft portion 122a, a second eccentric shaft portion 122b, a first piston rotor 123a, a second piston rotor 123b, an intermediate plate 125, and vanes (not shown).

[0112] The first cylinder 120a is a member that is annular and extends in the axial direction Da when accommodated in the housing 10. The first cylinder 120a is fixed to a portion on the lower side Dvd of the inner circumferential surface of the main body 10a of the housing 10. The space inside the first cylinder 120a defined by the inner circumferential surface of the first cylinder 120a is set as a first compression chamber 120b for compressing refrigerant. That is, a cylindrical first compression chamber 120b extending in the axial direction Da is formed in the first cylinder 120a.

[0113] Furthermore, a first suction hole 120c is formed on the first cylinder 120a, which passes through the inner peripheral surface of the first cylinder 120a and the outer peripheral surface. The front end of the first suction port 10f of the first refrigerant introduction part 10h is inserted into the first suction hole 120c without a gap. Therefore, the refrigerant is introduced into the first compression chamber 120b through the first suction port 10f. Furthermore, a blade groove (not shown) extending from the inner peripheral surface to the outer peripheral surface and having blades arranged inside is formed on the first cylinder 120a.

[0114] The first eccentric shaft portion 122a is a cylindrical member provided integrally with the rotating shaft 11. The first eccentric shaft portion 122a is arranged at a position offset from the axis O which is the center of the rotating shaft 11 in a direction orthogonal to the axis O in the compression chamber 121a.

[0115] The first piston rotor 123a is a cylindrical component having an outer diameter smaller than the inner diameter of the first cylinder 120a. The first piston rotor 123a extends in the axial direction Da. The first piston rotor 123a is provided on the first eccentric shaft portion 122a. Inside the first piston rotor 123a, the first eccentric shaft portion 122a and the first piston rotor 123a are integrally configured. The first piston rotor 123a rotates together with the first eccentric shaft portion 122a in a state eccentric to the axis O as the rotating shaft 11 rotates. The first piston rotor 123a, like the piston rotor 123 described in the first embodiment, rolls eccentrically in the first compression chamber 120b as the rotating shaft 11 rotates.

[0116] The second cylinder 120d is a member that is annular and extends in the axial direction Da when accommodated in the housing 10. The second cylinder 120d is fixed to a portion of the inner circumferential surface of the main body 10a of the housing 10 that is closer to the lower side Dvd than the first cylinder 120a. The space inside the second cylinder 120d defined by the inner circumferential surface of the second cylinder 120d is set as a second compression chamber 120e for compressing refrigerant. That is, a cylindrical second compression chamber 120e extending in the axial direction Da is formed in the second cylinder 120d.

[0117] Furthermore, a second suction hole 120f is formed in the second cylinder 120d, which passes through the inner peripheral surface of the second cylinder 120d and the outer peripheral surface. The front end of the second suction port 10g of the second refrigerant introduction part 10i is inserted into the second suction hole 120f without a gap. Therefore, the refrigerant passes through the second suction port 10g and is introduced into the second compression chamber 120e. Furthermore, a vane groove (not shown) extending from the inner peripheral surface to the outer peripheral surface and having a vane arranged inside is formed on the second cylinder 120d.

[0118] The second eccentric shaft portion 122b is a cylindrical member provided integrally with the rotating shaft 11. The second eccentric shaft portion 122b is arranged in the second compression chamber 120e at a position offset from the axis O which is the center of the rotating shaft 11 in a direction orthogonal to the axis O. The second eccentric shaft portion 122b in the present embodiment is offset, for example, in a direction opposite to the direction in which the first eccentric shaft portion 122a is offset relative to the rotating shaft 11.

[0119] The second piston rotor 123b is a cylindrical component having an outer diameter smaller than the inner diameter of the second cylinder 120d. The second piston rotor 123b extends in the axial direction Da. The second piston rotor 123b is arranged on the second eccentric shaft portion 122b. Inside the second piston rotor 123b, the second eccentric shaft portion 122b and the second piston rotor 123b are integrally configured. The second piston rotor 123b rotates together with the second eccentric shaft portion 122b in a state eccentric to the axis O as the rotating shaft 11 rotates. The second piston rotor 123b, like the piston rotor 123 described in the first embodiment, rolls eccentrically in the second compression chamber 120e as the rotating shaft 11 rotates.

[0120] The intermediate plate 125 is a component disposed between the first cylinder 120a and the second cylinder 120d, and isolating the first compression chamber 120b formed in the first cylinder 120a and the second compression chamber 120e formed in the second cylinder 120d from each other. The intermediate plate 125 in this embodiment is cylindrical and fixed to the inner surface of the main body 10a of the housing 10.

[0121] The upper bearing 131 is provided on the first cylinder 120a at one side Dau of the first cylinder 120a, and rotatably supports the rotating shaft 11 in the housing 10. The lower bearing 132 is provided on the second cylinder 120d at the other side Dad of the second cylinder 120d, and rotatably supports the rotating shaft 11 in the housing 10. Therefore, these upper bearing 131 and lower bearing 132 are arranged to sandwich the first cylinder 120a and the second cylinder 120d from the axial direction Da.

[0122] The upper bearing 131 is fixed to the first cylinder 120a from one side Dau while slidably surrounding the rotating shaft 11 from the outer circumference side. The lower bearing 132 is fixed to the second cylinder 120d from the other side Dad while slidably surrounding the rotating shaft 11 from the outer circumference side.

[0123] The upper bearing 131 includes an upper bearing body 131 a and an upper bearing cover portion 131 b. The upper bearing body 131 a includes a first cylinder portion 131 c and a first flange portion 131 d.

[0124] When the upper bearing 131 is arranged in the first cylinder 120a, the first cylinder 131c is cylindrical and extends in the axial direction Da. The first cylinder 131c surrounds the rotating shaft 11 from the outer peripheral side in a slidable manner. The first flange portion 131d is a component that extends from the first cylinder 131c along the radial direction of the rotating shaft 11 in a state of being integrated with the first cylinder 131c. The first flange portion 131d is fixed to the surface of the first cylinder 120a facing the other side Dad by a fastening portion such as a bolt. The first flange portion 131d is arranged on the part of the first cylinder 131c on the other side Dad. The first flange portion 131d is annular when viewed from the axial direction Da. A recess 131f is formed on the surface of the first flange portion 131d facing one side Dad and extending in the circumferential direction of the rotating shaft 11.

[0125] The upper bearing cover 131b is provided on the surface of the first flange 131d facing the one side Dau so as to close the recess 131f formed on the first flange 131d from the one side Dau. The upper bearing cover 131b is provided on the first flange 131d so as to surround the first cylinder 131c from the outer peripheral side. The upper bearing cover 131b can be attached and detached relative to the first flange 131d. The upper bearing cover 131b is fixed to the first flange 131d by a fastening part such as a bolt, for example.

[0126] The lower bearing 132 in the present embodiment includes a lower bearing body 132a and a lower bearing cover portion 132b.

[0127] The lower bearing body 132a has a second cylindrical portion 132c and a second flange portion 132d.

[0128] When the lower bearing 132 is provided in the second cylinder 120d, the second cylindrical portion 132c has a cylindrical shape extending in the axial direction Da. The second cylindrical portion 132c slidably surrounds the rotary shaft 11 from the outer peripheral side.

[0129] The second flange portion 132d is a member extending from the second cylindrical portion 132c in the radial direction of the rotary shaft 11 in a state of being integrated with the second cylindrical portion 132c. The second flange portion 132d is fixed to the surface of the second cylinder 120d facing the other side Dad by a fastening member such as a bolt.

[0130] The second flange portion 132d is disposed on a portion of one side Dau in the second cylinder portion 132c. The second flange portion 132d is annular when viewed from the axial direction Da. A recess 132f is formed on the surface of the second flange portion 132d facing the other side Dad, which is recessed toward the one side Dau and extends in the circumferential direction of the rotating shaft 11.

[0131] The lower bearing cover 132b is provided on the surface of the second flange 132d facing the other side Dad so as to close the recess 132f formed on the second flange 132d from the other side Dad. The lower bearing cover 132b is provided on the second flange 132d so as to surround the second cylinder 132c from the outer peripheral side. The lower bearing cover 132b can be attached and detached relative to the second flange 132d. The lower bearing cover 132b is fixed to the second flange 132d by a fastening part such as a bolt, for example.

[0132] The injection unit 2 in the present embodiment includes a first injection unit 20 a formed in the upper bearing 131 and a second injection unit 20 b formed in the lower bearing 132 .

[0133] The first injection portion 20a includes a first port 21a, a first intermediate pressure chamber 22a, a first check valve 23a, and a first injection hole 24a.

[0134] The first port 21a is a hole formed in the first flange portion 131d of the upper bearing 131. The first port 21a extends from the outer peripheral surface of the first flange portion 131d to the inner surface of the recessed portion 131f formed in the first flange portion 131d. Therefore, the first port 21a opens on the outer peripheral surface of the first flange portion 131d and the inner surface of the recessed portion 131f, respectively. The first injection pipe 31 for supplying refrigerant is connected to the opening of the first port 21a formed on the outer peripheral surface of the first flange portion 131d. Therefore, refrigerant from the outside is supplied to the first port 21a through the first injection pipe 31. The first injection pipe 31 passes through the main body 10a of the shell 10 and is connected to a device (not shown) for supplying injection refrigerant arranged on the outside of the shell 10.

[0135] The first intermediate pressure chamber 22a is a chamber formed in the upper bearing 131. The first intermediate pressure chamber 22a is the above-mentioned recessed portion 131f formed in the first flange portion 131d. Specifically, the recessed portion 131f formed in the first flange portion 131d is closed by the upper bearing cover portion 131b, thereby defining the first intermediate pressure chamber 22a. Therefore, by removing the upper bearing cover portion 131b from the upper bearing body 131a, the first intermediate pressure chamber 22a is opened. The refrigerant flowing in the first port 21a flows into the first intermediate pressure chamber 22a.

[0136] The first check valve 23a is a reed valve provided in the first intermediate pressure chamber 22a and is used to prevent the refrigerant flowing into the first intermediate pressure chamber 22a from the port 21 from flowing back to the first port 21a. The first check valve 23a is arranged in the first intermediate pressure chamber 22a in such a manner as to block the opening portion of the first port 21a opened in the first intermediate pressure chamber 22a.

[0137] The first injection hole 24a is a hole that connects the first intermediate pressure chamber 22a with the first compression chamber 120b formed in the first cylinder 120a. The first injection hole 24a extends from the inner surface of one side Dau in the first intermediate pressure chamber 22a toward the first compression chamber 120b toward the other side Dad. The first injection hole 24a opens on the inner surface of the recessed portion 131f and the surface of the first flange portion 131d facing the other side Dad.

[0138] The first port 21a and the first intermediate pressure chamber 22a of the first injection portion 20a and the upper bearing cover portion 131b of the upper bearing 131 are arranged in the order of the first port 21a, the first intermediate pressure chamber 22a, and the upper bearing cover portion 131b in the axial direction Da. In other words, the first port 21a, the first intermediate pressure chamber 22a, and the upper bearing cover portion 131b are arranged in the order of the first port 21a, the first intermediate pressure chamber 22a, and the upper bearing cover portion 131b in the direction away from the first compression chamber 120b.

[0139] The second injection portion 20b has a second port 21b, a second intermediate pressure chamber 22b, a second check valve 23b, and a second injection hole 24b.

[0140] The second port 21b is a hole formed in the second flange portion 132d of the lower bearing 132. The second port 21b extends from the outer peripheral surface of the second flange portion 132d to the inner surface of the recess 132f formed in the second flange portion 132d. Therefore, the second port 21b is opened on the outer peripheral surface of the second flange portion 132d and the inner surface of the recess 132f, respectively. The second injection pipe 32 for supplying refrigerant is connected to the opening of the second port 21b formed on the outer peripheral surface of the second flange portion 132d. Therefore, refrigerant from the outside is supplied to the second port 21b through the second injection pipe 32. The second injection pipe 32 passes through the main body 10a of the shell 10 and is connected to a device (not shown) for supplying injection refrigerant arranged on the outside of the shell 10.

[0141] The second intermediate pressure chamber 22b is a chamber formed in the lower bearing 132. The second intermediate pressure chamber 22b is the above-mentioned recessed portion 132f formed in the second flange portion 132d. Specifically, the recessed portion 132f formed in the second flange portion 132d is closed by the lower bearing cover portion 132b, thereby defining the second intermediate pressure chamber 22b. Therefore, by removing the lower bearing cover portion 132b from the lower bearing body 132a, the second intermediate pressure chamber 22b is opened. The refrigerant flowing in the second port 21b flows into the second intermediate pressure chamber 22b.

[0142] The second check valve 23b is a reed valve provided in the second intermediate pressure chamber 22b and is used to prevent the refrigerant flowing into the second intermediate pressure chamber 22b from the port 21 from flowing back to the second port 21b. The second check valve 23b is arranged in the second intermediate pressure chamber 22b in such a manner as to block the opening portion of the second port 21b opened in the second intermediate pressure chamber 22b.

[0143] The second injection hole 24b is a hole that connects the second intermediate pressure chamber 22b with the second compression chamber 120e formed in the second cylinder 120d. The second injection hole 24b extends from the inner surface of the second intermediate pressure chamber 22b toward the second compression chamber 120e toward the other side Dad. The first injection hole 24a opens on the inner surface of the recessed portion 132f and the surface of the second flange portion 132d toward the one side Dau.

[0144] The second port 21b and the second intermediate pressure chamber 22b of the second injection portion 20b and the lower bearing cover portion 132b of the lower bearing 132 are arranged in the order of the second port 21b, the second intermediate pressure chamber 22b, and the lower bearing cover portion 132b in the axial direction Da. In other words, the second port 21b, the second intermediate pressure chamber 22b, and the lower bearing cover portion 132b are arranged in the order of the second port 21b, the second intermediate pressure chamber 22b, and the lower bearing cover portion 132b in the direction away from the second compression chamber 120e.

[0145] As described above, the functions and effects described in the first embodiment can also be achieved by the configuration described in the second embodiment.

[0146] (Other embodiments)

[0147] Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific structure is not limited to that of the embodiments, and addition, omission, replacement, and other changes in structure are possible within the scope not departing from the spirit of the present invention.

[0148] In addition, the injection unit 2 described in the first embodiment may be formed only in the upper bearing 131. Therefore, for example, the following structure may be possible, that is, the injection unit 2 described in the first embodiment is not formed in the lower bearing 132, and only the first injection unit 20a described in the second embodiment is formed in the upper bearing 131 described in the first embodiment.

[0149] Furthermore, the injection unit 2 may be formed at both the upper bearing 131 and the lower bearing 132. Therefore, for example, the injection unit 2 described in the first embodiment is not formed at the lower bearing 132, the first injection unit 20a described in the second embodiment is formed at the upper bearing 131 described in the first embodiment, and the second injection unit 20b described in the second embodiment is formed at the lower bearing 132 described in the first embodiment.

[0150] Furthermore, the injection portion 2 capable of supplying the refrigerant to each of the first compression chamber 120b and the second compression chamber 120e may be formed on the intermediate plate 125 described in the second embodiment.

[0151] <Notes>

[0152] The rotary compressor described in the embodiment can be understood, for example, as follows.

[0153] (1) The rotary compressor 100 involved in the first embodiment comprises: a rotating shaft 11 capable of rotating around an axis line O; a cylinder 121 forming a compression chamber 121a for compressing refrigerant as the rotating shaft 11 rotates; a bearing portion 13 provided in the cylinder 121 and supporting the rotating shaft 11 so as to be rotatable; and an injection portion 2 formed in the bearing portion 13 and capable of supplying refrigerant to the compression chamber 121a, the injection portion 2 comprising: a port 21 for circulating refrigerant supplied from the outside; an intermediate pressure chamber 22 extending along the circumferential direction of the rotating shaft 11 and through which refrigerant is introduced; a check valve 23 provided in the intermediate pressure chamber 22 to prevent the refrigerant in the intermediate pressure chamber 22 from flowing back to the port 21; and a plurality of injection holes 24 for connecting the intermediate pressure chamber 22 with the compression chamber 121a.

[0154] Thus, for example, the length of the refrigerant flow path between the compression chamber 121a and the check valve 23 arranged in the intermediate pressure chamber 22 can be shortened compared to the case where the check valve 23 is arranged on the flow path for supplying the refrigerant arranged outside the bearing portion 13. In addition, since the intermediate pressure chamber 22 formed in the bearing portion 13 extends in the circumferential direction, the injection hole 24 opened in the compression chamber 121a can be arranged in the circumferential direction.

[0155] (2) The rotary compressor 100 according to the second aspect is the rotary compressor 100 according to (1), wherein the plurality of injection holes 24 may extend along the axial direction Da and be arranged at equal intervals in the circumferential direction.

[0156] Thus, the length of the injection hole 24 extending from the intermediate pressure chamber 22 to the compression chamber 121a can be minimized. In addition, the timing at which each injection hole 24 opens in the compression chamber 121a can be made consistent during the refrigerant compression process.

[0157] (3) The rotary compressor 100 involved in the third embodiment is the rotary compressor 100 of (1) or (2), wherein the bearing portion 13 comprises: a bearing body, on which the injection portion 2 is formed; and a cover portion, which is provided on the bearing body in a detachable manner, and by removing it from the bearing body, the interior of the intermediate pressure chamber 22 can be opened, and the port 21, the intermediate pressure chamber 22 and the cover portion are arranged in the order of the port 21, the intermediate pressure chamber 22 and the cover portion in a direction away from the compression chamber 121a.

[0158] Thus, when the cover is removed from the bearing body, the inside of the intermediate pressure chamber 22 can be opened without passing through the port 21. That is, by removing the cover, the check valve 23 disposed in the intermediate pressure chamber 22 can be accessed.

[0159] Industrial Applicability

[0160] According to the present invention, it is possible to provide a rotary compressor capable of suppressing the generation of a dead volume and arranging injection holes with a high degree of freedom.

[0161] Explanation of symbols

[0162] 1- compressor body, 2- injection part, 3- injection pipe, 4- accumulator, 5- suction pipe, 6- discharge pipe, 7- foot, 10- shell, 10a- main body, 10b- upper cover, 10c- lower cover, 10d- refrigerant introduction part, 10e- suction port, 10f- first suction port, 10g- second suction port, 10h- first refrigerant introduction part, 10i- second refrigerant introduction part, 11- rotating shaft, 12, 12a- rotating compression part, 13- bearing part, 14- electric motor, 20a- first injection part, 20b- second injection part, 21-port, 21a-first port, 21b-second port, 22-intermediate pressure chamber, 22a-first intermediate pressure chamber, 22b-second intermediate pressure chamber, 23-check valve, 23a-first check valve, 23b-second check valve, 24-injection hole, 24a-first injection hole, 24b-second injection hole, 31-first injection pipe, 32-second injection pipe, 100-compressor, 101d-side opening, 101h-first side opening, 101i-second side opening, 102d-cylinder, 102h-first cylinder, 102i- second cylindrical portion, 120a-first cylinder, 120b-first compression chamber, 120c-first suction hole, 120d-second cylinder, 120e-second compression chamber, 120f-second suction hole, 121-cylinder, 121a-compression chamber, 121b-suction hole, 121c-vane groove, 122-eccentric shaft portion, 122a-first eccentric shaft portion, 122b-second eccentric shaft portion, 123-piston rotor, 123a-first piston rotor, 123b-second piston rotor, 124-vane, 125-middle plate, 131-upper bearing, 13 1a-upper bearing body, 131b-upper bearing cover, 131c-first cylinder, 131d-first flange, 131e, 132e-discharge holes, 131f, 132f-recesses, 132-lower bearing, 132a-lower bearing body, 132b-lower bearing cover, 132c-second cylinder, 132d-second flange, 141-rotor, 142-stator, Br-bracket, Da-axial direction, Dad-the other side, Dau-one side, Dv-vertical direction, Dvd-lower side, Dvu-upper side, 0-axial line.

Claims

1. A rotary compressor comprising: A rotating shaft, capable of rotating about an axis; a cylinder forming a compression chamber for compressing a refrigerant as the rotating shaft rotates; a bearing portion provided on the cylinder and rotatably supporting the rotating shaft; and an injection portion formed in the bearing portion and capable of supplying refrigerant into the compression chamber, The injection unit has: A port for circulating a refrigerant supplied from the outside; an intermediate pressure chamber extending in the circumferential direction of the rotating shaft and into which refrigerant is introduced from the port; a check valve, disposed in the intermediate pressure chamber, to prevent the refrigerant in the intermediate pressure chamber from flowing back toward the port; and A plurality of injection holes allow the intermediate pressure chamber to communicate with the compression chamber.

2. The rotary compressor according to claim 1, wherein: The plurality of injection holes extend along the axial direction and are arranged at equal intervals in the circumferential direction.

3. The rotary compressor according to claim 1 or 2, wherein: The bearing portion has: a bearing body, formed with the injection portion; and The cover is detachably provided on the bearing body, and the intermediate pressure chamber can be opened by removing the cover from the bearing body. The port, the intermediate pressure chamber, and the cover portion are arranged in this order in a direction away from the compression chamber.

Images