Compressor and refrigeration cycle device

Abstract

This compressor (2) is provided with a sealed container (14), an electric motor (15), a low-stage compression mechanism unit (29), a high-stage compression mechanism unit (30), and an intermediate partition plate (31). A high-stage compression mechanism (30), which is provided with a cylindrical high-stage cylinder (40b), a high-stage rotary piston (41b), a high-stage vane (43b) that divides the internal space of the high-stage cylinder (40b) into a high-stage suction chamber (59b) and a high-stage compression chamber (60b) together with the high-stage rotary piston (41b), and a space surrounded by a high-stage bearing (42b) and a high-stage discharge muffler (57b), and which feeds compressed refrigerant into a sealed container (14) A high-stage back pressure chamber (70b), which is a space surrounded by the high-stage cylinder (40b), the high-stage bearing (42b), the intermediate partition plate (31), and the high-stage blades (43b), is a space different from the internal space of the sealed container (14), and communicates with the high-stage refrigerant supply path (58b).

Description

Technical Field

[0001] The present disclosure relates to a compressor and a refrigeration cycle device. Background Art

[0002] Generally, there is known a two-stage compressor including a low-stage compression mechanism portion for compressing refrigerant from a low pressure to an intermediate pressure, and a high-stage compression mechanism portion for compressing refrigerant from an intermediate pressure to a high pressure.

[0003] In addition, a compressor in which a vane mechanism described later is applied to a compression mechanism portion is known because of its high compression efficiency and low cost.

[0004] For example, Patent Document 1 discloses that a vane mechanism is applied to a two-stage compressor having a low-stage compression mechanism portion and a high-stage compression mechanism portion.

[0005] In the two-stage compressor described in Patent Document 1, the low-stage compression mechanism supplies the refrigerant of the intermediate pressure to the high-stage compression mechanism, and the high-stage compression mechanism discharges the high-pressure refrigerant to the outside of the closed container through the internal space of the closed container. In addition, the high-pressure refrigerant released into the internal space of the closed container pressurizes the lubricating oil stored at the bottom of the closed container, and the pressure state of the lubricating oil becomes high pressure.

[0006] Each compression mechanism includes a cylindrical cylinder, a cylindrical rotary piston disposed in the inner space of the cylinder, and a vane disposed in the cylinder and slidable in the radial direction of the cylinder. A vane back pressure chamber communicating with lubricating oil via a connecting flow path is formed in the cylinder.

[0007] The blade is pressed against the rotary piston by a spring provided in the blade back pressure chamber, and together with the rotary piston, divides the internal space of the cylinder into two spaces. The low-stage compression side mechanism and the high-stage compression side mechanism respectively compress the refrigerant from low pressure to intermediate pressure and from intermediate pressure to high pressure by changing the volume of the two spaces. According to such a structure, in the two-stage compressor described in Patent Document 1, the internal space of the cylinder provided by the high-stage compression mechanism is filled with high-pressure refrigerant, and the blade back pressure chamber is filled with high-pressure lubricating oil.

[0008] Patent Document 1: WO2012 / 090345

[0009] However, when a structure in which the blade back-pressure chamber is connected to the lubricating oil via a connecting flow path is applied to a two-stage compressor in which the low-stage compression mechanism supplies the intermediate-pressure refrigerant to the high-stage compression mechanism via the internal space of a closed container, the intermediate-pressure refrigerant released into the internal space of the closed container pressurizes the lubricating oil stored at the bottom of the closed container, and the pressure state of the lubricating oil changes to the intermediate pressure. According to such a structure, the internal space of the cylinder provided in the high-stage compression mechanism is filled with the high-pressure refrigerant, and the blade back-pressure chamber is filled with the intermediate-pressure lubricating oil. As a result, a difference occurs in the pressure state of the blade back-pressure chamber and the internal space of the cylinder, and a force is generated in the blade from the internal space of the cylinder toward the blade back-pressure chamber, so that the blade becomes easy to separate from the rotary piston. As a result, the problem of poor contact between the blade and the rotary piston occurs. Summary of the invention

[0010] The present disclosure has been made to solve the above-mentioned problems, and an object of the present disclosure is to provide a two-stage compressor capable of suppressing poor contact between a vane and a rolling piston.

[0011] The compressor disclosed in the present invention comprises a sealed container, wherein the internal space of the sealed container comprises: an electric motor, a low-stage compression mechanism portion which is driven by a crankshaft installed on the electric motor and compresses the refrigerant from a low pressure to an intermediate pressure, a high-stage compression mechanism portion which is driven by the crankshaft and compresses the refrigerant discharged from the low-stage compression mechanism portion from an intermediate pressure to a high pressure, and an intermediate partition plate which is arranged between the low-stage compression mechanism portion and the high-stage compression mechanism portion, wherein the high-stage compression mechanism portion comprises: a high-stage cylinder body in a cylindrical shape; a high-stage rotary piston which is arranged in the internal space of the high-stage cylinder body; and high-stage vanes which are arranged to slide freely along the radial direction of the high-stage cylinder body and which, together with the high-stage rotary piston, separate the internal space of the high-stage cylinder body into a space for sucking in the refrigerant. The high-level suction chamber and the high-level compression chamber for compressing the refrigerant; and the high-level refrigerant supply path, which is a space surrounded by a high-level bearing and a high-level discharge muffler, and is a path for discharging the refrigerant compressed in the high-level compression chamber to the external space of the closed container. The high-level bearing supports the crankshaft and is adjacent to the high-level cylinder body in the axial direction of the high-level cylinder body. The high-level discharge muffler is adjacent to the high-level bearing in the axial direction of the high-level cylinder body. The high-level cylinder body has a high-level back-pressure chamber, so the high-level back-pressure chamber is a space surrounded by the outer peripheral surface of the high-level cylinder body, the high-level bearing, the middle partition plate and the high-level blades. The high-level back-pressure chamber is a space different from the internal space of the closed container and is connected to the high-level refrigerant supply path.

[0012] The refrigeration cycle device disclosed in the present invention comprises: a compressor, a condenser for liquefying the refrigerant discharged from the compressor, a pressure reducing device for reducing the pressure of the refrigerant sent from the condenser, and an evaporator for gasifying the refrigerant sent from the pressure reducing device, the compressor comprises a closed container, and the internal space of the closed container comprises: an electric motor, a low-stage compression mechanism part which is driven by a crankshaft installed on the electric motor and compresses the refrigerant from a low pressure to an intermediate pressure, a high-stage compression mechanism part which is driven by the crankshaft and compresses the refrigerant discharged from the low-stage compression mechanism part from the intermediate pressure to a high pressure, and an intermediate partition plate arranged between the low-stage compression mechanism part and the high-stage compression mechanism part, the high-stage compression mechanism part comprises: a high-stage cylinder body in a cylindrical shape; a high-stage rotary piston which is arranged in the internal space of the high-stage cylinder body; and a high-stage vane which is arranged to slide freely along the radial direction of the high-stage cylinder body and to move together with the high-stage rotary piston. The internal space of the high-stage cylinder is divided into a high-stage suction chamber for sucking refrigerant and a high-stage compression chamber for compressing refrigerant; and a high-stage refrigerant supply path, which is a space surrounded by a high-stage bearing and a high-stage discharge muffler, and is a path for discharging the refrigerant compressed in the high-stage compression chamber to the external space of the closed container. The high-stage bearing supports the crankshaft and is adjacent to the high-stage cylinder in the axial direction of the high-stage cylinder. The high-stage discharge muffler is adjacent to the high-stage bearing in the axial direction of the high-stage cylinder. The high-stage cylinder has a high-stage back-pressure chamber, which is a space surrounded by the outer peripheral surface of the high-stage cylinder, the high-stage bearing, the intermediate partition plate and the high-stage blades. The high-stage back-pressure chamber is a space different from the internal space of the closed container and is connected to the high-stage refrigerant supply path. It has a condenser for liquefying the fluid, a pressure reducing device for reducing the pressure of the compressed fluid, and an evaporator for vaporizing the fluid.

[0013] According to the present disclosure, poor contact between the vane and the rolling piston can be suppressed. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a diagram showing the refrigeration cycle device according to Embodiment 1.

[0015] Figure 2 It is a longitudinal sectional view of the compressor in Embodiment 1.

[0016] Figure 3 yes Figure 2 Schematic diagram of the AA section and the schematic diagram of the BB section.

[0017] Figure 4 yes Figure 3 CC cross-sectional view.

[0018] Figure 5 yes Figure 3 DD cross-sectional view.

[0019] Figure 6 Yes means Figure 1Diagram showing the refrigerant flow when the compressor is operating.

[0020] Figure 7 This is a diagram showing the flow of refrigerant when the compressor according to Embodiment 1 is operating.

[0021] Figure 8 yes Figure 7 Schematic diagram of the EE cross section.

[0022] Fig. 9 yes Figure 7 Schematic diagram of the FF cross section. DETAILED DESCRIPTION

[0023] Hereinafter, the embodiments of the present disclosure will be described with reference to the accompanying drawings. In addition, the accompanying drawings are schematic representations, and the mutual relationship between the dimensions and positions shown in different drawings is not necessarily accurately recorded, but can be appropriately changed. In addition, in the following description, the same components are marked with the same reference numerals for illustration, and their names and functions are the same or the same. Therefore, there is a case where their detailed description is omitted.

[0024] Implementation Method 1

[0025] use Figure 1 The refrigeration cycle device 1 in the present embodiment is described. The refrigeration cycle device 1 includes a compressor 2, a high-pressure side heat exchanger 3, a decompression device 4, a low-pressure side heat exchanger 5, a refrigerant pipe 6, and a control unit (not shown).

[0026] The compressor 2, the high-pressure side heat exchanger 3, the pressure reducing device 4 and the low-pressure side heat exchanger 5 are connected by the refrigerant piping 6 to form a refrigeration cycle, and the refrigerant circulates in the order of the compressor 2, the high-pressure side heat exchanger 3, the pressure reducing device 4 and the low-pressure side heat exchanger 5.

[0027] The refrigerant piping 6 includes: a low-pressure refrigerant piping 7, which connects the low-pressure side heat exchanger 5 with the refrigerant suction pipe 10, through which the low-pressure refrigerant flows; an intermediate-pressure refrigerant piping 8, which connects the refrigerant discharge pipe 12 with the refrigerant suction pipe 11, through which the intermediate-pressure refrigerant flows; and a high-pressure refrigerant piping 9, which connects the refrigerant discharge pipe 13 with the high-pressure side heat exchanger 3, through which the high-pressure refrigerant flows.

[0028] The compressor 2 compresses the refrigerant sucked from the refrigerant suction pipe 10 to an intermediate pressure, discharges the compressed refrigerant from the refrigerant discharge pipe 12, and sucks from the refrigerant suction pipe 11 via the intermediate-pressure refrigerant piping 8. Then, the refrigerant sucked from the refrigerant suction pipe 11 is compressed to a high pressure, and the compressed refrigerant is discharged from the refrigerant discharge pipe 13.

[0029] The high-pressure side heat exchanger 3 functions as a condenser, and exchanges heat between the refrigerant compressed by the compressor 2 and the air, thereby causing the compressed refrigerant to dissipate heat and liquefy the refrigerant.

[0030] The decompression device 4 expands the refrigerant after the refrigerant has released heat in the high-pressure side heat exchanger 3 .

[0031] The low-pressure side heat exchanger 5 functions as an evaporator, and heats the expanded refrigerant by exchanging heat between the refrigerant expanded by the decompression device 4 and the air, thereby vaporizing the refrigerant.

[0032] The control unit controls the entire refrigeration cycle device 1 based on instructions from an input device such as a remote controller, thereby controlling the flow of the refrigerant. The control unit, for example, performs frequency control of the compressor 2. The control unit is composed of, for example, an analog circuit, a digital circuit, a CPU (Central Processing Unit) and a memory, or a combination of two or more of the above, and can be set in the refrigeration cycle device 1 or in another housing.

[0033] The operation of the refrigeration cycle device 1 will be described. Figure 1 The arrows shown indicate the direction of refrigerant flow.

[0034] By driving the compressor 2, the compressed refrigerant is discharged from the refrigerant discharge pipe 13 of the compressor 2. The refrigerant discharged from the compressor 2 flows into the high-pressure side heat exchanger 3. In the high-pressure side heat exchanger 3, heat exchange is performed between the inflowing refrigerant and the air, so that the refrigerant dissipates heat. The refrigerant sent out from the high-pressure side heat exchanger 3 is expanded through the pressure reducing device 4. The refrigerant expanded through the pressure reducing device 4 flows into the low-pressure side heat exchanger 5. In the low-pressure side heat exchanger 5, heat exchange is performed between the inflowing refrigerant and the air, so that the refrigerant is heated. The refrigerant sent out from the low-pressure side heat exchanger 5 flows into the compressor 2, becomes compressed refrigerant, and is discharged from the compressor 2 again, and this cycle is repeated.

[0035] The refrigerant used may include, for example, HFC (Hydro Fluoro Carbon) refrigerants such as R32, R125, R134a, R407C, R410A, HFO (Hydro Fluoro Olefin) refrigerants such as R1123, R1132 (E), R1132 (Z), R1132a, R1141, R1234yf, R1234ze (E), R1234ze (Z), natural refrigerants such as R290 (propane), R600a (isobutane), R744 (carbon dioxide), R717 (ammonia), etc., and at least one refrigerant.

[0036] use Figure 2 to Figure 5The compressor 2 in this embodiment will be described.

[0037] In the following description, Figure 2 In the description, the direction of the axis of the stator 25 and the rotor 26 indicated by A1 is referred to as the "axial direction", and the radial direction centered on the axis indicated by arrow R1 is referred to as the "radial direction". The compressor 2 includes: a closed container 14, an electric motor 15, a crankshaft 16, a low-stage compression mechanism 29, a high-stage compression mechanism 30, and an intermediate partition plate 31.

[0038] like Figure 2 As shown, the sealed container 14 includes a cylindrical barrel portion 18, a hemispherical upper cover portion 19, and a hemispherical lower cover portion 20. The upper cover portion 19 is welded to the upper portion of the barrel portion 18, and the lower cover portion 20 is welded to the lower portion. The sealed container 14 is set on a base 21, and the lower cover portion 20 is fixed to the base 21. The sealed container 14 includes: a refrigerant suction pipe 10 and a refrigerant suction pipe 11 for sucking refrigerant, and a refrigerant discharge pipe 12 and a refrigerant discharge pipe 13 for discharging refrigerant. The upper portion of the sealed container 14 is provided with a terminal 23 for connecting an external power supply to a lead wire 22. The bottom of the sealed container 14 stores a refrigeration oil 24 for lubricating the sliding parts of the low-stage compression mechanism portion 29 and the high-stage compression mechanism portion 30. The refrigeration oil 24 is, for example, POE (polyol ester), PVE (polyethylene ether), AB (alkylbenzene), etc.

[0039] The motor 15 includes a stator 25 and a rotor 26, which has a certain gap with the stator 25 and is located on the same axis. The motor 15 is located inside the cylinder 18, and is installed on the upper part of the low-stage compression mechanism 29 and the high-stage compression mechanism 30 by spot welding, shrink fitting, etc., and drives the low-stage compression mechanism 29 and the high-stage compression mechanism 30 via the crankshaft 16.

[0040] The crankshaft 16 has a low-stage eccentric portion 27 and a high-stage eccentric portion 28 that are unidirectionally eccentric, and is mounted on the rotor 26 .

[0041] The low-stage compression mechanism portion 29 , the high-stage compression mechanism portion 30 , and the intermediate partition plate 31 are stacked from the bottom in the order of the high-stage compression mechanism portion 30 , the intermediate partition plate 31 , and the low-stage compression mechanism portion 29 .

[0042] use Figures 2 to 5 The low-stage compression mechanism portion 29 will be described. Figure 3 yes Figure 2 A portion of the schematic diagram of the AA section in FIG. Figure 4 yes Figure 2 The enlarged view of the low-stage compression mechanism 29 and the high-stage compression mechanism 30 in FIG. Figure 3 In the CC section view, Figure 5 yes Figure 2The enlarged view of the low-stage compression mechanism 29 and the high-stage compression mechanism 30 in FIG. Figure 3 DD section view in.

[0043] Figure 2 and Figure 3 The low-stage compression mechanism 29 shown includes a cylindrical low-stage cylinder 40a, a cylindrical low-stage rotary piston 41a, a low-stage bearing 42a, a rectangular low-stage blade 43a, and a low-stage spring 44a, which compresses the refrigerant sucked from the refrigerant suction pipe 10 from a low pressure to an intermediate pressure and discharges it from the refrigerant discharge pipe 12. The low-stage cylinder 40a and the low-stage bearing 42a are stacked from the bottom in this order.

[0044] Figure 3 The low-stage cylinder 40a shown in the figure has formed in the internal space of the low-stage cylinder 40a: a low-stage cylinder chamber 45a, which is coaxial with the crankshaft 16; a low-stage blade hole 46a, which radially arranges the low-stage blade 43a to slide freely; a low-stage hole 47a, which accommodates the low-stage spring 44a; a low-stage suction path 49a, which sucks refrigerant from the refrigerant suction pipe 10 through the low-stage suction communication path 55a described later; and a low-stage discharge path 50a, which discharges refrigerant to the refrigerant discharge pipe 12 through the internal space of the closed container 14. In addition, in Figure 3 The low-stage cylinder 40a is schematically shown in the figure, but the low-stage spring hole 48a, the low-stage internal thread portion 51a, the low-stage plug 52a and the low-stage external thread portion 53a described later are not shown.

[0045] The low-stage rolling piston 41 a is disposed in the low-stage cylinder chamber 45 a and is attached to the low-stage eccentric portion 27 of the crankshaft 16 .

[0046] The low-stage vane hole 46a is disposed between the low-stage suction path 49a and the low-stage discharge path 50a, is formed in the radial direction from the low-stage cylinder chamber 45a toward the low-stage hole 47a, and penetrates the low-stage cylinder 40a in the axial direction.

[0047] The low-stage hole 47a is arranged between the low-stage suction path 49a and the low-stage discharge path 50a, is formed between the low-stage vane hole 46a and the outer peripheral surface of the low-stage cylinder 40a, penetrates the low-stage cylinder 40a in the axial direction, and communicates with the low-stage vane hole 46a.

[0048] Figure 3 The low-level blade 43a shown is inserted into the low-level blade hole 46a in a radially slidable manner, and together with the low-level rotary piston 41a, the low-level cylinder chamber 45a is divided into a low-level suction chamber 59a and a low-level compression chamber 60a. In addition, a coating such as a DLC coating that reduces the friction coefficient of the sliding surface can also be applied to the sliding surface of the low-level blade 43a.

[0049] The low-stage spring 44a is accommodated in the low-stage hole 47a, and the low-stage vane 43a attached to the front end of the low-stage spring 44a is pressed against the outer peripheral surface of the low-stage rotary piston 41a.

[0050] use Figure 3 and Figure 4 The low-stage spring hole 48a, the low-stage internal thread portion 51a, the low-stage plug 52a, and the low-stage external thread portion 53a will be described.

[0051] exist Figure 3 The lower cylinder 40a shown is also provided with a Figure 4 The low-level spring 44a shown is inserted into the low-level spring hole 48a. The low-level spring hole 48a is configured Figure 3 The low-stage suction path 49a and the low-stage discharge path 50a shown in the figure are formed between the low-stage hole 47a and the outer peripheral surface of the low-stage cylinder 40a, and are connected to the outer peripheral surface of the low-stage cylinder 40a and the low-stage hole 47a and the low-stage blade hole 46a. Figure 4 As shown, an internal thread groove, i.e., a low-level internal thread portion 51a, is formed on the inner surface of the low-level spring hole 48a. A low-level plug 52a is arranged at the portion where the low-level spring hole 48a and the outer peripheral surface of the low-level cylinder body 40a meet to block the portion. An external thread groove, i.e., a low-level external thread portion 53a, is formed on the outer surface of the low-level plug 52a. The low-level external thread portion 53a of the low-level plug 52a is screwed into the low-level internal thread portion 51a, thereby separating the low-level back pressure chamber 70a described later from the internal space of the closed container 14.

[0052] In the low-stage compression mechanism 29, a low-stage back pressure chamber 70a is formed by the outer circumferential surface of the low-stage cylinder 40a, the lower surface of the low-stage bearing 42a, the upper surface of the intermediate partition plate 31, and the side surface of the low-stage blade 43a facing the outer circumferential surface.

[0053] Figure 4 and Figure 5 The low-stage bearing 42a shown supports the crankshaft 16. In addition, the low-stage bearing 42a is formed with: a low-stage suction hole 54a, into which the front end of the refrigerant suction pipe 10 is inserted; a low-stage suction connecting passage 55a, which connects the low-stage suction hole 54a with the low-stage suction path 49a; and a first low-stage through hole 56a described later, which connects the low-stage discharge path 50a with the low-stage refrigerant supply path 58a. A low-stage discharge muffler 57a is arranged on the upper part of the low-stage bearing 42a. Here, the first low-stage through hole 56a is Figure 3 The CC section view in Figure 4 as well as Figure 3 The DD section view in Figure 5 Not shown in the figure, described later Figure 8 Medium picture.

[0054] The low-stage refrigerant supply path 58 a is a space surrounded by the upper surface of the low-stage bearing 42 a and the low-stage discharge muffler 57 a , and is a path for discharging the intermediate-pressure refrigerant compressed in the low-stage cylinder 40 a to the refrigerant discharge pipe 12 .

[0055] use Figures 2 to 5 The high-stage compression mechanism section 30 will be described. Figure 3 yes Figure 2 A portion of the schematic diagram of the BB section in FIG. Figure 4 yes Figure 2 The enlarged view of the low-stage compression mechanism 29 and the high-stage compression mechanism 30 in FIG. Figure 3 In the CC section view, Figure 5 yes Figure 2 The enlarged view of the low-stage compression mechanism 29 and the high-stage compression mechanism 30 in FIG. Figure 3 DD section view in.

[0056] Figure 2 and Figure 3 The high-stage compression mechanism 30 shown in the figure comprises: a cylindrical high-stage cylinder 40b, a cylindrical high-stage rotary piston 41b, a high-stage bearing 42b, a rectangular high-stage vane 43b and a high-stage spring 44b, and compresses the refrigerant sucked from the refrigerant suction pipe 11 from the intermediate pressure to the high pressure, and discharges it from the refrigerant discharge pipe 13. The high-stage bearing 42b and the high-stage cylinder 40b are stacked from the bottom in this order.

[0057] Figure 3 The high-stage cylinder 40b shown in the figure has formed in the internal space of the high-stage cylinder 40b: a high-stage cylinder chamber 45b, which is coaxial with the crankshaft 16; a high-stage blade hole 46b, which configures the high-stage blade 43b to slide freely in the radial direction; a high-stage hole 47b, which accommodates the high-stage spring 44b; a high-stage suction path 49b, which sucks refrigerant from the refrigerant suction pipe 11 through the high-stage suction communication path 55b described later; and a high-stage discharge path 50b, which discharges refrigerant to the refrigerant discharge pipe 13 without passing through the internal space of the closed container 14. In addition, in Figure 3 The high-stage cylinder 40b is schematically shown in the figure, and the high-stage spring hole 48b, the high-stage internal thread portion 51b, the high-stage plug 52b and the high-stage external thread portion 53b described later are not shown.

[0058] The high-stage rolling piston 41 b is disposed in the high-stage cylinder chamber 45 b and is attached to the high-stage eccentric portion 28 of the crankshaft 16 .

[0059] The high-stage vane hole 46b is disposed between the high-stage suction path 49b and the high-stage discharge path 50b, is formed in the radial direction from the high-stage cylinder chamber 45b toward the high-stage hole 47b, and penetrates the high-stage cylinder 40b in the axial direction.

[0060] The high-stage hole 47b is arranged between the high-stage suction path 49b and the high-stage discharge path 50b, is formed between the high-stage vane hole 46b and the outer peripheral surface of the high-stage cylinder 40b, penetrates the high-stage cylinder 40b in the axial direction, and communicates with the high-stage vane hole 46b.

[0061] Figure 3 The high-level vane 43b shown is inserted into the high-level vane hole 46b in a radially slidable manner, and the high-level cylinder chamber 45b is divided into a high-level suction chamber 59b and a high-level compression chamber 60b together with the high-level rotary piston 41b. In addition, a coating that makes the friction coefficient of the sliding surface smaller, such as a DLC coating, can also be implemented on the sliding surface of the high-level vane 43b.

[0062] The high-stage spring 44b is accommodated in the high-stage hole 47b, and the high-stage vane 43b attached to the front end of the high-stage spring 44b is pressed against the outer peripheral surface of the high-stage rotary piston 41b.

[0063] use Figure 3 and Figure 4 The high-level spring hole 48b, the high-level internal thread portion 51b, the high-level plug 52b, and the high-level external thread portion 53b will be described.

[0064] exist Figure 3 The high-level cylinder 40b shown is also provided with a Figure 4 The high-level spring 44b shown is inserted into the high-level spring hole 48b. The high-level spring hole 48b is configured Figure 3 The high-level suction path 49b shown in the figure is formed between the high-level hole 47b and the outer peripheral surface of the high-level cylinder 40b, and is connected to the outer peripheral surface of the high-level cylinder 40b, the high-level hole 47b and the high-level blade hole 46b. Figure 4 As shown, an internal thread groove, i.e., a high-level internal thread portion 51b, is formed on the inner surface of the high-level spring hole 48b. A high-level plug 52b is arranged at the portion where the high-level spring hole 48b and the outer peripheral surface of the high-level cylinder body 40b meet to block the portion. An external thread groove, i.e., a high-level external thread portion 53b, is formed on the outer surface of the high-level plug 52b. The high-level external thread portion 53b of the high-level plug 52b is screwed into the high-level internal thread portion 51b, thereby separating the high-level back pressure chamber 70b described later from the internal space of the closed container 14.

[0065] In the high-stage compression mechanism 30, a high-stage back pressure chamber 70b is formed by the outer peripheral surface of the high-stage cylinder 40b, the upper surface of the high-stage bearing 42b, the lower surface of the intermediate partition plate 31, and the side surface of the high-stage vane 43b facing the outer peripheral surface.

[0066] Figure 4 as well as Figure 5The high-level bearing 42b shown supports the crankshaft 16. In addition, the high-level bearing 42b is formed with: a high-level suction hole 54b, into which the front end of the refrigerant suction pipe 11 is inserted; a high-level suction connecting passage 55b, which connects the high-level suction hole 54b with the high-level suction path 49b; a first high-level through hole 56b described later, which connects the high-level discharge path 50b with the high-level refrigerant supply path 58b; and a second high-level through hole 61b, which connects the high-level back pressure chamber 70b with the high-level refrigerant supply path 58b. A high-level discharge muffler 57b is arranged at the lower part of the high-level bearing 42b. Here, the first high-level through hole 56b is in Figure 3 The CC section view in Figure 4 as well as Figure 3 The DD section view in Figure 5 Not shown in the figure, described later Fig. 9 Medium picture.

[0067] The high-stage refrigerant supply path 58 b is a space surrounded by the lower surface of the high-stage bearing 42 b and the high-stage discharge muffler 57 b , and is a path for discharging the high-pressure refrigerant compressed in the high-stage cylinder 40 b to the refrigerant discharge pipe 13 .

[0068] The intermediate partition plate 31 is provided between the low-stage cylinder 40a and the high-stage cylinder 40b to separate the low-stage cylinder chamber 45a and the high-stage cylinder chamber 45b into different spaces. The intermediate partition plate 31 is formed with a second low-stage through hole 61a that connects the low-stage back pressure chamber 70a and the high-stage refrigerant supply path 58b.

[0069] use Figure 6 to Figure 9 The operation of the compressor 2 will be described. Figure 7 yes Figure 6 The enlarged view of the low-stage compression mechanism 29 and the high-stage compression mechanism 30 in FIG. Figure 7 The left half of the axis A1 is Figure 3 In the CC section view, Figure 7 The right half of the axis A1 is Figure 3 DD section view in, Figure 8 yes Figure 7 Schematic diagram of the EE section in Fig. 9 yes Figure 7 Schematic diagram of the FF cross section. Figure 6 to Figure 9 The arrows (1) to (11) shown indicate the refrigerant flow direction.

[0070] First, power is supplied to the motor 15 from the terminal 23 via the lead wire 22, thereby rotating the crankshaft 16 mounted on the rotor 26, and the low-stage rotary piston 41a eccentrically rotates in the low-stage cylinder chamber 45a. Then, the volume of the two spaces divided into the low-stage suction chamber 59a and the low-stage compression chamber 60a by the low-stage rotary piston 41a and the low-stage vane 43a changes. In the low-stage suction chamber 59a, the volume gradually increases, so that Figure 6 As shown by arrows (1) and (2), low-pressure refrigerant is sucked from the low-stage suction path 49a via the low-pressure refrigerant pipe 7, the refrigerant suction pipe 10 and the low-stage suction communication path 55a. In the low-stage compression chamber 60a, the volume gradually decreases, so that the sucked low-pressure refrigerant is compressed, as shown in FIG. Figure 6 and Figure 8 As shown by arrows (3) and (4), the intermediate-pressure refrigerant is discharged to the inner side of the closed container 14 via the low-stage discharge path 50a, the first low-stage through hole 56a, the low-stage refrigerant supply path 58a and the low-stage discharge muffler 57a.

[0071] Here, use Figure 6 and Figure 8 The first low-level through hole 56 a will be described in detail.

[0072] Figure 8 The first low-stage through hole 56a shown in FIG. 5 is provided in the low-stage bearing 42a so as to connect the low-stage discharge path 50a with the low-stage refrigerant supply path 58a. Figure 6 As shown by arrow (3), the refrigerant flows from the low-stage discharge path 50a to the low-stage refrigerant supply path 58a. Figure 6 As shown by arrow (4), refrigerant is supplied to the low-stage refrigerant supply path 58a and discharged to the internal space of the closed container 14 from the low-stage discharge muffler 57a.

[0073] Figure 8 The arrow (3) shows the Figure 6 The arrow (3) indicates the refrigerant flowing through the low-stage refrigerant supply path 58a and the first low-stage through-hole 56a.

[0074] Then, if Figure 6 As shown by arrows (5) and (6), the intermediate-pressure refrigerant discharged to the inner side of the closed container 14 is discharged from the refrigerant discharge pipe 12 and is sucked into the refrigerant suction pipe 11 via the intermediate-pressure refrigerant piping 8.

[0075] In addition, similarly to the low-stage compression mechanism 29, the high-stage rotary piston 41b rotates eccentrically in the high-stage cylinder chamber 45b. The volume of the two spaces divided into the high-stage suction chamber 59b and the high-stage compression chamber 60b by the high-stage rotary piston 41b and the high-stage vane 43b changes. In the high-stage suction chamber 59b, the volume gradually increases, so that Figure 6 As shown by arrows (6) and (7), the intermediate pressure refrigerant is sucked from the high-stage suction path 49b via the intermediate pressure refrigerant pipe 8, the refrigerant suction pipe 11 and the high-stage suction communication path 55b. In the high-stage compression chamber 60b, the volume gradually decreases, so that the sucked intermediate pressure refrigerant is compressed, as shown in FIG. Figure 6 and Fig. 9 As shown by arrows (8) and (9), the high-pressure refrigerant is discharged from the refrigerant discharge pipe 13 via the high-pressure discharge path 50b, the first high-pressure through hole 56b, the high-pressure refrigerant supply path 58b, and the high-pressure discharge muffler 57b. At the same time, the high-pressure refrigerant discharged to the high-pressure discharge muffler 57b is discharged. Figure 7 and Fig. 9 As shown by the arrow (10), the high-pressure liquid is supplied to the high-pressure back pressure chamber 70b through the second high-pressure through hole 61b. Figure 7 As shown by the arrow (11), the liquid is supplied to the low-stage back pressure chamber 70a via the second low-stage through hole 61a.

[0076] Here, use Figure 6 , Figure 7 as well as Fig. 9 The first high-order through-hole 56 b and the second high-order through-hole 61 b ​​are described in detail.

[0077] Fig. 9 The first high-level through hole 56b shown in FIG. 5 is provided in the high-level bearing 42b in such a manner as to connect the high-level discharge path 50b with the high-level refrigerant supply path 58b. Figure 6 As shown by arrow (8), the refrigerant flows from the high-stage discharge path 50b to the high-stage refrigerant supply path 58b. Figure 6 As shown by arrow (9), refrigerant is supplied to the high-stage refrigerant supply path 58b, and high-pressure refrigerant is discharged from the high-stage discharge muffler 57b and the refrigerant discharge pipe 13.

[0078] Fig. 9 The arrow (8) shows the Figure 6 The arrow (8) indicates the refrigerant flow in the high-stage refrigerant supply path 58b after passing through the first high-stage through hole 56b. Fig. 9 The arrow (10) shows the Figure 7 The arrow (10) indicates the refrigerant flow in the high-stage refrigerant supply path 58b before passing through the second high-stage through hole 61b.

[0079] In the compressor 2 of the present embodiment, the high-pressure refrigerant discharged to the high-stage discharge muffler 57b is supplied to the high-stage back pressure chamber 70b through the second high-stage through hole 61b, and then supplied to the low-stage back pressure chamber 70a through the second low-stage through hole 61a. Then, in the low-stage compression mechanism 29, the low-stage back pressure chamber 70a is filled with the high-pressure refrigerant, and the low-stage suction chamber 59a and the low-stage compression chamber 60a are filled with the low-pressure refrigerant and the intermediate-pressure refrigerant, respectively. As a result, the magnitude relationship of the pressure state of the refrigerant in the low-stage back pressure chamber 70a and the low-stage cylinder chamber 45a is as follows: low-stage back pressure chamber 70a>low-stage cylinder chamber 45a, thereby preventing the low-stage vane 43a from generating a force in the direction from the low-stage cylinder chamber 45a toward the low-stage back pressure chamber 70a, and preventing the low-stage vane 43a from separating from the low-stage rotary piston 41a. As a result, it is possible to suppress the poor contact between the low-stage vane 43a and the low-stage rotary piston 41a.

[0080] Furthermore, by suppressing poor contact between the low-stage vane 43a and the low-stage rotary piston 41a, the followability of the low-stage vane 43a to the low-stage rotary piston 41a is improved. As a result, poor compression of the refrigerant caused by insufficient separation of the low-stage suction chamber 59a and the low-stage compression chamber 60a can be suppressed.

[0081] Furthermore, when the followability of the low-stage vane 43a to the low-stage rotary piston 41a is low, noise caused by collision sound between the low-stage vane 43a and the low-stage rotary piston 41a caused by repeated separation and contact between the low-stage vane 43a and the low-stage rotary piston 41a can be suppressed.

[0082] In addition, in the high-stage compression mechanism 30, the high-stage back pressure chamber 70b is filled with high-pressure refrigerant, and the high-stage suction chamber 59b and the high-stage compression chamber 60b are filled with intermediate-pressure refrigerant and high-pressure refrigerant, respectively. As a result, the magnitude relationship of the pressure states of the refrigerants in the high-stage back pressure chamber 70b and the high-stage cylinder chamber 45b is as follows: the high-stage back pressure chamber 70b ≥ the high-stage cylinder chamber 45b, thereby preventing the high-stage vane 43b from generating a force in the direction from the high-stage cylinder chamber 45b toward the high-stage back pressure chamber 70b, and preventing the high-stage vane 43b from separating from the high-stage rotary piston 41b. As a result, poor contact between the high-stage vane 43b and the high-stage rotary piston 41b can be suppressed.

[0083] Furthermore, by suppressing poor contact between the high-stage vane 43b and the high-stage rotary piston 41b, the high-stage vane 43b is able to follow the high-stage rotary piston 41b, thereby suppressing poor compression of the refrigerant caused by insufficient separation of the high-stage suction chamber 59b and the high-stage compression chamber 60b.

[0084] Furthermore, when the high-stage vane 43b has high followability with respect to the high-stage rolling piston 41b, noise caused by collision sound between the high-stage vane 43b and the high-stage rolling piston 41b caused by repeated separation and contact between the high-stage vane 43b and the high-stage rolling piston 41b can be suppressed.

[0085] In addition, in the present embodiment, an example is shown in which the low-stage compression mechanism 29 is arranged in the upper layer and the high-stage compression mechanism 30 is arranged in the lower layer, but the low-stage compression mechanism 29 may be arranged in the lower layer and the high-stage compression mechanism 30 may be arranged in the upper layer.

[0086] In addition, in this embodiment, an example is shown in which the low-level external thread portion 53a of the low-level plug 52a is screwed into the low-level internal thread portion 51a, thereby separating the low-level back pressure chamber 70a from the interior of the closed container 14, and the high-level external thread portion 53b of the high-level plug 52b is screwed into the high-level internal thread portion 51b, thereby separating the high-level back pressure chamber 70b from the interior of the closed container 14. However, the low-level spring hole 48a and the low-level plug 52a, and the high-level spring hole 48b and the high-level plug 52b may be joined separately by welding or the like.

[0087] In addition, in the above-mentioned embodiments described in this specification, there are cases where the material, material, size, shape, relative configuration relationship or implementation conditions of each component are recorded, but these are all examples in all aspects and are not limited to the contents recorded in each embodiment. Therefore, countless unillustrated variations can be assumed within the scope of each embodiment. For example, it includes the case where any component is deformed, added or omitted, and also includes the case where at least one component in at least one embodiment is extracted and combined with the components of other embodiments.

[0088] Description of Reference Numerals

[0089] 1...refrigeration cycle device; 2...compressor; 3...high-pressure side heat exchanger; 4...pressure reducing device; 5...low-pressure side heat exchanger; 14...sealed container; 15...motor; 16...crankshaft; 29...low-stage compression mechanism; 30...high-stage compression mechanism; 40a...low-stage cylinder; 40b...high-stage cylinder; 41a...low-stage rotary piston; 41b...high-stage rotary piston; 42a...low-stage bearing; 42b...high-stage bearing; 43a...low-stage blade; 43b...high-stage blade; 48a...low-stage spring hole; 48b...high-stage spring hole; 51a...low-stage bearing; 52b...high-stage bearing; 53a...low-stage blade; 54b...high-stage blade; 55a...low-stage bearing; 56b...high-stage bearing; 57a...low-stage bearing; 58b...high-stage bearing; 59a...low-stage bearing; 60b...high-stage bearing; 61a...low-stage bearing; 62b...high-stage bearing; 63a...low-stage blade; 64b...high-stage blade; 65a...low-stage bearing; 66b...high-stage bearing; 67a...low-stage bearing; 68b...high-stage bearing; 69a...low-stage bearing; 70b...high-stage bearing; 71a...low-stage bearing; 72b...high-stage bearing; 73a...low-stage blade; 74b...high-stage blade; 75a...low-stage bearing; 76b...low-stage bearing; 77b...high-stage bearing; 78a...low-stage bearing; 79b...low-stage bearing; 80b...low-stage bearing; 81a...low-stage bearing; 82b...high-stage 1...low-stage internal threaded portion; 51b...high-stage internal threaded portion; 52a...low-stage bolt; 52b...high-stage bolt; 53a...low-stage external threaded portion; 53b...high-stage external threaded portion; 57a...low-stage discharge muffler; 57b...high-stage discharge muffler; 58a...low-stage refrigerant supply path; 58b...high-stage refrigerant supply path; 59a...low-stage suction chamber; 59b...high-stage suction chamber; 60a...low-stage compression chamber; 60b...high-stage compression chamber; 61a...second low-stage through hole; 61b...second high-stage through hole; 70a...low-stage back pressure chamber; 70b...high-stage back pressure chamber.

Claims

1. A compressor, characterized in that: A closed container is provided, wherein the internal space of the closed container is provided with: a motor, a low-stage compression mechanism portion which is driven by a crankshaft mounted on the motor and compresses a refrigerant from a low pressure to an intermediate pressure, a high-stage compression mechanism portion which is driven by the crankshaft and compresses a refrigerant discharged from the low-stage compression mechanism portion from an intermediate pressure to a high pressure, and an intermediate partition plate which is arranged between the low-stage compression mechanism portion and the high-stage compression mechanism portion, The high-level compression mechanism unit comprises: High-grade cylinder body in cylindrical shape; A high-level rotary piston, which is arranged in the internal space of the high-level cylinder; A high-level vane, which is configured to slide freely along the radial direction of the high-level cylinder body, and together with the high-level rotary piston, divides the internal space of the high-level cylinder body into a high-level suction chamber for sucking refrigerant and a high-level compression chamber for compressing refrigerant; as well as A high-stage refrigerant supply path is a space surrounded by a high-stage bearing and a high-stage discharge muffler, and is a path for discharging the refrigerant compressed in the high-stage compression chamber to the external space of the closed container, wherein the high-stage bearing supports the crankshaft and is adjacent to the high-stage cylinder in the axial direction of the high-stage cylinder, and the high-stage discharge muffler is adjacent to the high-stage bearing in the axial direction of the high-stage cylinder. The high-stage cylinder body has a high-stage back pressure chamber, which is a space surrounded by the outer peripheral surface of the high-stage cylinder body, the high-stage bearing, the intermediate partition plate and the high-stage blades. The high-stage back pressure chamber is a space different from the internal space of the closed container, and communicates with the high-stage refrigerant supply path.

2. The compressor according to claim 1, characterized in that The high-stage bearing is formed with a high-stage through hole that allows the high-stage back-pressure chamber to communicate with the high-stage refrigerant supply path.

3. The compressor according to claim 1 or 2, characterized in that: have: a high-stage spring hole formed in the high-stage cylinder in such a manner that the outer peripheral surface of the high-stage cylinder communicates with the high-stage back pressure chamber; and A high-stage plug is provided at a portion where the high-stage spring hole contacts the outer peripheral surface of the high-stage cylinder in order to block the high-stage spring hole.

4. The compressor according to claim 3, characterized in that A high-grade internal thread portion is formed in the high-grade spring hole, A high-grade external thread portion is formed on the high-grade bolt. The high-level bolt is screwed into the high-level spring hole.

5. The compressor according to any one of claims 1 to 4, characterized in that: The low-stage compression mechanism unit comprises: A low-level cylinder block in a cylindrical shape; a low-stage rotary piston disposed in the interior space of the low-stage cylinder; and The low-stage vane is configured to slide freely along the radial direction of the low-stage cylinder body, and together with the low-stage rotary piston, divides the internal space of the low-stage cylinder body into: a low-stage suction chamber for sucking refrigerant by expanding the volume, and a low-stage compression chamber for compressing the refrigerant by reducing the volume, The low-stage cylinder body has a low-stage back pressure chamber, which is a space surrounded by the outer peripheral surface of the low-stage cylinder body, the low-stage bearing supporting the crankshaft and adjacent to the low-stage cylinder body in the axial direction of the low-stage cylinder body, the intermediate partition plate, and the low-stage blades. The low-stage back pressure chamber is a space different from the internal space of the closed container, and communicates with the high-stage refrigerant supply path.

6. The compressor according to claim 5, characterized in that The intermediate partition plate is formed with a low-stage through hole that allows the low-stage back pressure chamber to communicate with the high-stage refrigerant supply path.

7. The compressor according to claim 5 or 6, characterized in that: have: a low-stage spring hole formed in the low-stage cylinder in such a manner that the outer peripheral surface of the low-stage cylinder communicates with the low-stage back pressure chamber; and A low-stage plug is provided at a portion where the low-stage spring hole contacts the outer peripheral surface of the low-stage cylinder in order to block the low-stage spring hole.

8. The compressor according to claim 7, characterized in that A low-level internal thread portion is formed in the low-level spring hole, A low-level external thread portion is formed on the low-level bolt, The primary bolt is screwed into the primary spring hole.

9. A refrigeration cycle device, characterized in that: have: The compressor according to any one of claims 1 to 8; a condenser that liquefies the refrigerant discharged from the compressor; a pressure reducing device for reducing the pressure of the refrigerant sent from the condenser; as well as The evaporator gasifies the refrigerant sent from the decompression device.

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