Method for manufacturing rotary compressor and rotary compressor

Abstract

To suppress residue of burrs that are created at an opening edge of a vertical hole of an injection hole.SOLUTION: A method for manufacturing a rotary compressor including: a compressing unit for compressing a refrigerant; a motor for driving the compressing unit; and a compressor body container housing the compressing part and the motor therein. The compressing unit includes: an annular cylinder with a cylinder chamber formed therein; an annular piston provided in the cylinder chamber; an end panel closing an end of the cylinder; and an injection hole provided in the end panel and ejecting the refrigerant into the cylinder chamber. The injection hole includes a vertical hole extending in a rotational axis direction of the motor, and the vertical hole is open on a sliding surface of the end panel on which the piston slides. In a step of forming the injection hole in the end panel, a chamfered part is formed along an entire periphery of the opening edge of the vertical hole.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a method for manufacturing a rotary compressor and a rotary compressor. [Background technology]

[0002] Known rotary compressors include a compressor section that compresses a refrigerant and that has a cylinder with a cylinder chamber formed therein, a piston disposed in the cylinder chamber, and an end plate that closes the end of the cylinder. The end plate has a sliding surface formed thereon against which the end face of the piston that revolves in the cylinder chamber slides.

[0003] Some rotary compressors of this type have an injection hole in the end plate through which liquid refrigerant is injected into the cylinder chamber during compression in the cylinder chamber. This injection hole has a vertical hole that extends along the rotational axis of the motor that drives the compression section and opens onto the sliding surface of the end plate, and a horizontal hole that extends from the outer periphery of the end plate along the sliding surface and connects to the vertical hole. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-23582 Summary of the Invention [Problem to be solved by the invention]

[0005] In the manufacturing process of the rotary compressor described above, when the vertical hole for the injection hole is formed in the end plate, there is a problem that burrs are generated on the opening edge of the vertical hole that opens into the sliding surface. For example, when the sliding surface is mirror-finished after the vertical hole is formed in the sliding surface of the end plate, burrs are generated from the opening edge of the vertical hole that protrude into the inside of the vertical hole.

[0006] Generally, when removing burrs from the edges of holes such as bolt holes in end plates, a rotating brush is moved along the edge of the opening or inserted into the hole. However, vertical holes are generally formed with a diameter of about 1 mm, which is smaller than bolt holes, etc., which have a diameter of about 6 mm, and there is a problem in that burrs that occur in vertical holes with small diameters are difficult to remove properly even with a brush.

[0007] If burrs formed on the opening edge of the vertical hole are not sufficiently removed during the manufacturing process of the rotary compressor and remain, there is a risk that the compression section will be damaged if the burrs enter the cylinder chamber along with the refrigerant sprayed from the vertical hole during compression of the refrigerant in the cylinder chamber.

[0008] The disclosed technology has been made in consideration of the above, and aims to provide a rotary compressor and a manufacturing method for a rotary compressor that can suppress the formation of burrs on the opening edge of the vertical hole of the injection hole. [Means for solving the problem]

[0009] One aspect of the method for manufacturing a rotary compressor disclosed in the present application is a method for manufacturing a rotary compressor comprising: a compression unit that compresses a refrigerant; a motor that drives the compression unit; and a compressor main body container that houses the compression unit and the motor, wherein the compression unit has an annular cylinder with a cylinder chamber formed therein, an annular piston disposed within the cylinder chamber, an end plate that closes an end of the cylinder, and an injection hole provided in the end plate for injecting refrigerant into the cylinder chamber, wherein the injection hole has a vertical hole that extends along the direction of the rotational axis of the motor and opens on a sliding surface of the end plate along which the piston slides, and wherein in the step of forming the injection hole in the end plate, a chamfer is formed around the entire circumference of the opening edge of the vertical hole. [Effects of the Invention]

[0010] According to one aspect of the method for manufacturing a rotary compressor disclosed in the present application, it is possible to suppress burrs from remaining on the opening edge of the vertical hole of the injection hole. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a vertical cross-sectional view showing a rotary compressor according to an embodiment of the present invention. [Figure 2] FIG. 2 is an exploded perspective view showing a compression section of the rotary compressor of the embodiment. [Figure 3] FIG. 3 is a cross-sectional view of the compression section of the rotary compressor of the embodiment as viewed from above. [Figure 4] FIG. 4 is a plan view showing the intermediate partition plate of the rotary compressor of the embodiment. [Figure 5] FIG. 5 is a vertical cross-sectional view showing an injection hole of a compression section in an embodiment. [Figure 6A] FIG. 6A is a cross-sectional view illustrating the revolution of a piston in a compression section of the rotary compressor of the embodiment. [Figure 6B] FIG. 6B is a cross-sectional view illustrating the revolution of the piston in the compression section of the rotary compressor of the embodiment. [Figure 6C] FIG. 6C is a cross-sectional view illustrating the revolution of the piston in the compression section of the rotary compressor of the embodiment. [Figure 6D] FIG. 6D is a cross-sectional view illustrating the revolution of the piston in the compression section of the rotary compressor of the embodiment. [Figure 7A] FIG. 7A is a plan view showing the suction chamber formed when the piston revolves in the embodiment. [Figure 7B] FIG. 7B is a plan view showing the suction area formed during one revolution of the piston in the embodiment. [Figure 8A] FIG. 8A is a plan view showing a circular area on the inner periphery of the piston that is formed when the piston makes one revolution in the embodiment. [Figure 8B] FIG. 8B is a plan view showing an inner peripheral region formed during one revolution of the piston in the embodiment. [Figure 8C] FIG. 8C is a vertical cross-sectional view showing a main part of the piston. [Figure 9]FIG. 9 is a schematic diagram showing a first range in which the vertical hole and chamfered portion of the injection hole are located in a one-cylinder rotary compressor. [Figure 10A] FIG. 10A is a schematic diagram showing an example of the range in which the upper cylinder chamber and the lower cylinder chamber overlap when viewed from the top-bottom direction of the compression section when the upper piston and the lower piston revolve. [Figure 10B] FIG. 10B is a schematic diagram showing a second range formed during one revolution of the upper piston and the lower piston in the embodiment. [Figure 11] FIG. 11 is a schematic diagram showing the upper third area and the lower third area in which the vertical hole and the chamfered portion of the injection hole are located in the two-cylinder rotary compressor of the embodiment. [Figure 12] FIG. 12 is a schematic diagram showing an enlarged view of the upper third area and the lower third area in the example. [Figure 13] FIG. 13 is a schematic diagram for explaining the process of forming an injection hole in the embodiment. [Figure 14] FIG. 14 is a flowchart illustrating the steps of forming an injection hole in the embodiment. [Figure 15] FIG. 15 is a schematic diagram for explaining another example of the step of forming an injection hole in the embodiment. [Figure 16] FIG. 16 is a flowchart illustrating another example of the process for forming an injection hole in the embodiment. [Figure 17A] FIG. 17A is an enlarged schematic view showing a step of forming an injection hole in an example. [Figure 17B] FIG. 17B is an enlarged schematic view showing a step of forming an injection hole in a comparative example. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, examples of a rotary compressor and a manufacturing method thereof disclosed in the present application will be described in detail with reference to the drawings. Note that the rotary compressor and the manufacturing method thereof disclosed in the present application are not limited to the following examples. [Example]

[0013] (Configuration of a rotary compressor) Fig. 1 is a vertical cross-sectional view showing a rotary compressor of an embodiment, Fig. 2 is an exploded perspective view showing a compression section of the rotary compressor of an embodiment, and Fig. 3 is a horizontal cross-sectional view of the compression section of the rotary compressor of an embodiment as seen from above.

[0014] As shown in FIG. 1, the rotary compressor 1 includes a compression section 12 located at the bottom of a sealed, vertically-placed, cylindrical compressor main body container 10, a motor 11 located at the top of the compressor main body container 10 and driving the compression section 12 via a shaft 15, and a vertically-placed, cylindrical accumulator 25 fixed to the outer peripheral surface of the compressor main body container 10 and sealed.

[0015] The accumulator 25 is connected to the upper cylinder chamber 130T (see FIG. 2) of the upper cylinder 121T via the upper compression section suction pipe 105 and the upper accumulator communication pipe 31T, and is connected to the lower cylinder chamber 130S (see FIG. 2) of the lower cylinder 121S via the lower compression section suction pipe 104 and the lower accumulator communication pipe 31S. In this embodiment, the upper compression section suction pipe 105 and the lower compression section suction pipe 104 overlap in the circumferential direction of the compressor main body container 10, and are located at the same position.

[0016] An upper guide pipe 108 is fixed to the compressor main body vessel 10 by brazing, and the upper compression section suction pipe 105 is passed through the inside of the upper guide pipe 108 and fixed to the upper guide pipe 108 by brazing. Similarly, a lower guide pipe 109 is fixed to the compressor main body vessel 10 by brazing, and the lower compression section suction pipe 104 is passed through the inside of the lower guide pipe 109 and fixed to the lower guide pipe 109 by brazing.

[0017] The motor 11 has a stator 111 disposed on the outside and a rotor 112 disposed on the inside. The stator 111 is fixed in a shrink-fit state to the inner circumferential surface of the compressor main body container 10. The rotor 112 is fixed in a shrink-fit state to the shaft 15.

[0018] The shaft 15 has a main shaft portion 153, a counter shaft portion 151, an upper eccentric portion 152T into which the upper piston 125T is fitted, a lower eccentric portion 152S into which the lower piston 125S is fitted, and an intermediate shaft portion 150 formed between the upper eccentric portion 152T and the lower eccentric portion 152S. The centers of the main shaft portion 153, the counter shaft portion 151, and the intermediate shaft portion 150 coincide with the center O of the cylinder. The centers of the upper eccentric portion 152T and the lower eccentric portion 152S are eccentric so as not to coincide with the center O of the cylinder.

[0019] The shaft 15 has a countershaft 151 below the lower eccentric portion 152S rotatably supported by a counter bearing 161S provided on the lower end plate 160S, and a main shaft 153 above the upper eccentric portion 152T rotatably supported by a main bearing 161T provided on the upper end plate 160T. The shaft 15 is provided with the upper eccentric portion 152T and the lower eccentric portion 152S with a phase difference of 180 degrees from each other, and the upper piston 125T is supported by the upper eccentric portion 152T, and the lower piston 125S is supported by the lower eccentric portion 152S. As a result, the shaft 15 is rotatably supported with respect to the entire compression section 12, and the rotation of the shaft 15 causes the upper piston 125T to revolve along the inner circumferential surface of the upper cylinder 121T, and causes the lower piston 125S to revolve along the inner circumferential surface of the lower cylinder 121S.

[0020] Lubricating oil 18 is sealed inside compressor main body container 10 in an amount that nearly immerses compression section 12, in order to ensure lubrication of sliding parts such as upper piston 125T and lower piston 125S that slide in compression section 12 and to seal upper compression chamber 133T (see FIG. 2) and lower compression chamber 133S (see FIG. 2). Mounting legs 309 (see FIG. 1) that engage multiple elastic support members (not shown) that support the entire rotary compressor 1 are fixed to the underside of compressor main body container 10.

[0021] As shown in Fig. 1, compression section 12 compresses refrigerant drawn through upper compression section suction pipe 105 and lower compression section suction pipe 104, and discharges the refrigerant from discharge pipe 107, which will be described later. As shown in Fig. 2, compression section 12 is configured by stacking, from top to bottom, upper end plate cover 170T having a bulging portion with a hollow space formed therein, upper end plate 160T, annular upper cylinder 121T, intermediate partition plate 140 which serves as an end plate, annular lower cylinder 121S, lower end plate 160S, and flat lower end plate cover 170S. The entire compression section 12 is fixed by a plurality of through bolts 174, 175 and auxiliary bolts 176 arranged approximately concentrically from above and below.

[0022] As shown in Fig. 3, the compression section 12 is provided with a plurality of bolt holes 177 penetrating the lower end plate 160S, the lower cylinder 121S, the intermediate partition plate 140, the upper end plate 160T, and the upper cylinder 121T. One of a plurality of through-bolts 174, 175 is passed through each of the plurality of bolt holes 177. The compression section 12 is also provided with through-holes 178 penetrating the lower end plate 160S, the lower cylinder 121S, the intermediate partition plate 140, the upper end plate 160T, and the upper cylinder 121T. Of the through-holes 178 penetrating the compression section 12, the through-holes 178 formed in the intermediate partition plate 140 and the upper cylinder 121T are used to receive positioning pins (not shown) for positioning the intermediate partition plate 140 and the upper cylinder 121T. In addition, among the through holes 178 that pass through the compression section 12, auxiliary bolts 176 are passed through the through holes 178 formed in the lower cylinder 121S and the lower end plate 160S, thereby fastening the lower cylinder 121S and the lower end plate 160S together.

[0023] As shown in Fig. 3, an upper cylinder inner wall 123T is formed in the upper cylinder 121T along a circle concentric with the shaft 15 of the motor 11. An upper piston 125T having an outer diameter smaller than the inner diameter of the upper cylinder 121T is disposed within the upper cylinder inner wall 123T, and an upper compression chamber 133T that draws in, compresses, and discharges a refrigerant is formed between the upper cylinder inner wall 123T and the upper piston 125T. A lower cylinder inner wall 123S is formed in the lower cylinder 121S along a circle concentric with the shaft 15 of the motor 11. A lower piston 125S having an outer diameter smaller than the inner diameter of the lower cylinder 121S is disposed within the lower cylinder inner wall 123S, and a lower compression chamber 133S that draws in, compresses, and discharges a refrigerant is formed between the lower cylinder inner wall 123S and the lower piston 125S.

[0024] As shown in FIGS. 2 and 3, the upper cylinder 121T has an upper protrusion 122T that protrudes radially from its circular outer periphery in the direction of the shaft 15. The upper protrusion 122T is provided with an upper vane groove 128T that extends radially outward from the upper cylinder chamber 130T. An upper vane 127T is slidably disposed within the upper vane groove 128T. The upper vane 127T has a tip surface that contacts the outer periphery of the upper piston 125T. The lower cylinder 121S has a lower protrusion 122S that protrudes radially from its circular outer periphery in the direction of the shaft 15. The lower protrusion 122S is provided with a lower vane groove 128S that extends radially outward from the lower cylinder chamber 130S. A lower vane 127S is slidably disposed within the lower vane groove 128S. The lower vane 127S has a tip surface that contacts the outer circumferential surface of the lower piston 125S.

[0025] The upper lateral protrusion 122T and the lower lateral protrusion 122S are formed over a predetermined protruding range along the circumferential direction of the shaft 15. The upper lateral protrusion 122T and the lower lateral protrusion 122S are used as chuck holders for fixing the upper cylinder 121T and the lower cylinder 121S to a processing jig when processing them.

[0026] An upper spring hole 124T is formed in the upper lateral protrusion 122T at a position overlapping the upper vane groove 128T from the outer surface, with a depth that does not penetrate into the upper cylinder chamber 130T. An upper spring 126T is disposed in the upper spring hole 124T. A lower spring 124S is formed in the lower lateral protrusion 122S at a position overlapping the lower vane groove 128S from the outer surface, with a depth that does not penetrate into the lower cylinder chamber 130S. A lower spring 126S is disposed in the lower spring hole 124S.

[0027] The lower cylinder 121S is also formed with a lower pressure introduction passage 129S that connects the radial outside of the lower vane groove 128S to the inside of the compressor main body vessel 10, introduces compressed refrigerant from the compressor main body vessel 10, and applies back pressure to the lower vane 127S by the pressure of the refrigerant. The upper cylinder 121T is also formed with an upper pressure introduction passage 129T that connects the radial outside of the upper vane groove 128T to the inside of the compressor main body vessel 10 through an opening, introduces compressed refrigerant from the compressor main body vessel 10, and applies back pressure to the upper vane 127T by the pressure of the refrigerant.

[0028] As shown in Fig. 3, an upper suction hole 135T that mates with the upper compression section suction pipe 105 is formed in the upper protruding portion 122T of the upper cylinder 121T. The upper suction hole 135T opens to the inner circumferential surface of the upper cylinder 121T and is located near the upper vane 127T. A lower suction hole 135S that mates with the lower compression section suction pipe 104 is formed in the lower protruding portion 122S of the lower cylinder 121S. The lower suction hole 135S opens to the inner circumferential surface of the lower cylinder 121S and is located near the lower vane 127S.

[0029] 2, the upper cylinder chamber 130T is formed by closing the upper and lower ends of the end of the upper cylinder 121T with an upper end plate 160T and an intermediate partition plate 140. The lower cylinder chamber 130S is formed by closing the upper and lower ends of the end of the lower cylinder 121S with an intermediate partition plate 140 and a lower end plate 160S. The upper cylinder chamber 130T and the lower cylinder chamber 130S are arranged to overlap when viewed from the vertical direction of the compression section 12 (the axial direction of the shaft 15).

[0030] 3, the upper cylinder chamber 130T is divided into an upper suction chamber 131T communicating with the upper suction hole 135T and an upper compression chamber 133T communicating with an upper discharge hole 190T provided in the upper end plate 160T when the upper vane 127T is pressed by the upper spring 126T and abuts against the outer peripheral surface of the upper piston 125T. The lower cylinder chamber 130S is divided into a lower suction chamber 131S communicating with the lower suction hole 135S and a lower compression chamber 133S communicating with a lower discharge hole 190S provided in the lower end plate 160S when the lower vane 127S is pressed by the lower spring 126S and abuts against the outer peripheral surface of the lower piston 125S.

[0031] Additionally, the upper discharge hole 190T is provided adjacent to the upper vane groove 128T, and the lower discharge hole 190S is provided adjacent to the lower vane groove 128S. The refrigerant compressed in the upper compression chamber 133T and the lower compression chamber 133S is discharged from the upper compression chamber 133T and the lower compression chamber 133S through the upper discharge hole 190T and the lower discharge hole 190S.

[0032] 2, the upper end plate 160T is provided with an upper discharge hole 190T that penetrates the upper end plate 160T and communicates with the upper compression chamber 133T of the upper cylinder 121T, and an upper valve seat (not shown) is formed around the upper discharge hole 190T on the outlet side of the upper discharge hole 190T. The upper end plate 160T is formed with an upper discharge valve accommodating recess 164T that extends in a groove shape from the position of the upper discharge hole 190T toward the outer periphery of the upper end plate 160T.

[0033] The upper discharge valve accommodating recess 164T accommodates a reed valve-type upper discharge valve 200T whose rear end is fixed in the upper discharge valve accommodating recess 164T by an upper rivet 202T and whose front end opens and closes the upper discharge hole 190T, and the entire upper discharge valve retainer 201T whose rear end is overlapped with the upper discharge valve 200T and fixed in the upper discharge valve accommodating recess 164T by an upper rivet 202T and whose front end is curved (warped) in the direction in which the upper discharge valve 200T opens, thereby regulating the opening degree of the upper discharge valve 200T.

[0034] The lower end plate 160S is provided with a lower discharge hole 190S that penetrates the lower end plate 160S and communicates with the lower compression chamber 133S of the lower cylinder 121S. The lower end plate 160S is formed with a lower discharge valve accommodating recess (not shown) that extends in a groove shape from the position of the lower discharge hole 190S toward the outer periphery of the lower end plate 160S.

[0035] The lower discharge valve accommodating recess accommodates the lower discharge valve 200S, which is a reed valve type lower discharge valve whose rear end is fixed in the lower discharge valve accommodating recess by a lower rivet 202S and whose front end opens and closes the lower discharge hole 190S, and the entire lower discharge valve retainer 201S, whose rear end is overlapped with the lower discharge valve 200S and fixed in the lower discharge valve accommodating recess by the lower rivet 202S and whose front end is curved (warped) in the direction in which the lower discharge valve 200S opens, thereby regulating the opening degree of the lower discharge valve 200S.

[0036] An upper end plate cover chamber 180T is formed between the upper end plate 160T and the upper end plate cover 170T having a bulge, which are tightly fixed to each other. A lower end plate cover chamber 180S (see FIG. 1) is formed between the lower end plate 160S and the flat lower end plate cover 170S, which are also tightly fixed to each other. A plurality of first refrigerant passage holes 136A and second refrigerant passage holes 136B are provided that penetrate the lower end plate 160S, the lower cylinder 121S, the intermediate partition plate 140, the upper end plate 160T, and the upper cylinder 121T and communicate between the lower end plate cover chamber 180S and the upper end plate cover chamber 180T.

[0037] The flow of refrigerant due to the rotation of the shaft 15 will be described below. Within the upper cylinder chamber 130T, as the shaft 15 rotates, the upper piston 125T fitted to the upper eccentric portion 152T of the shaft 15 revolves along the inner circumferential surface of the upper cylinder 121T. As a result, the upper suction chamber 131T expands in volume while drawing in refrigerant from the upper compression section suction pipe 105. The upper compression chamber 133T compresses the refrigerant while reducing its volume. When the pressure of the compressed refrigerant exceeds the pressure in the upper end plate cover chamber 180T outside the upper discharge valve 200T, the upper discharge valve 200T opens, and the refrigerant is discharged from the upper compression chamber 133T to the upper end plate cover chamber 180T. The refrigerant discharged into the upper end plate cover chamber 180T is discharged into the compressor main body container 10 through the upper end plate cover discharge hole 172T (see FIG. 1) provided in the upper end plate cover 170T.

[0038] Additionally, within the lower cylinder chamber 130S, as the shaft 15 rotates, the lower piston 125S fitted to the lower eccentric portion 152S of the shaft 15 revolves along the inner circumferential surface of the lower cylinder 121S. As a result, the lower suction chamber 131S expands in volume while drawing in refrigerant from the lower compression section suction pipe 104, and the lower compression chamber 133S contracts in volume while compressing the refrigerant. When the pressure of the compressed refrigerant exceeds the pressure in the lower end plate cover chamber 180S outside the lower discharge valve 200S, the lower discharge valve 200S opens, and the refrigerant is discharged from the lower compression chamber 133S to the lower end plate cover chamber 180S. The refrigerant discharged into the lower end plate cover chamber 180S passes through the first refrigerant passage hole 136A, the second refrigerant passage hole 136B, and the upper end plate cover chamber 180T and is discharged into the compressor main body container 10 through the upper end plate cover discharge hole 172T provided in the upper end plate cover 170T.

[0039] The refrigerant discharged into the compressor main body container 10 is guided above the motor 11 through either a notch (not shown) that is connected vertically on the outer periphery of the stator 111, a gap (not shown) in the winding portion of the stator 111, or a gap 115 (see Figure 1) between the stator 111 and the rotor 112, and is discharged from a discharge pipe 107 located at the top of the compressor main body container 10.

[0040] (Characteristic structure of a rotary compressor) Next, a characteristic configuration of the rotary compressor 1 of the embodiment will be described. Fig. 4 is a plan view showing an intermediate partition plate 140 of the rotary compressor 1 of the embodiment. Fig. 5 is a vertical cross-sectional view showing an injection hole 141 of the compression section 12 in the embodiment.

[0041] As shown in Figures 4 and 5, features of the embodiment include chamfered portions 144T, 144S (hereinafter also referred to as chamfered portion 144) on the opening edge 142a (see Figures 5, 12, and 13) of the vertical hole 142 of the injection hole 141, and the position of the opening of the vertical hole 142 and the chamfered portion 144 on the sliding surfaces 140a, 140b of the intermediate partition plate 140.

[0042] The present invention is not limited to a structure in which the injection hole 141 is provided in the intermediate partition plate 140, and the injection hole 141 may be provided in each of the upper end plate 160T and the lower end plate 160S. Also, although a two-cylinder rotary compressor is exemplified in the embodiment, in the case of a one-cylinder rotary compressor (not shown), it is sufficient that the injection hole is provided in either the upper end plate or the lower end plate.

[0043] Hereinafter, for convenience, the upper piston 125T and the lower piston 125S are collectively referred to as the piston 125, the upper cylinder 121T and the lower cylinder 121S are collectively referred to as the cylinder 121, and the upper vane 127T and the lower vane 127S are collectively referred to as the vane 127.

[0044] 3 and 4, the intermediate partition plate 140 is provided with injection holes 141 for injecting liquid refrigerant into the upper cylinder chamber 130T and the lower cylinder chamber 130S. The injection holes 141 include a vertical hole 142 extending along the rotational axis direction of the motor 11 (the axial direction of the shaft 15), and a horizontal hole 143 extending from the outer circumferential surface of the intermediate partition plate 140 along the sliding surfaces 140a and 140b and connecting to the vertical hole 142.

[0045] The vertical hole 142 penetrates the intermediate partition plate 140 in the thickness direction of the intermediate partition plate 140 (the axial direction of the shaft 15) and includes an upper vertical hole 142T that opens onto a sliding surface 140a of the intermediate partition plate 140 on which the upper piston 125T slides, and a lower vertical hole 142S that opens onto a sliding surface 140b of the intermediate partition plate 140 on which the lower piston 125S slides. The upper vertical hole 142T extends in a direction perpendicular to the sliding surface 140a of the intermediate partition plate 140 (the axial direction of the shaft 15). Similarly, the lower vertical hole 142S extends in a direction perpendicular to the sliding surface 140b (the axial direction of the shaft 15).

[0046] Furthermore, the vertical hole 142 has a chamfered portion 144T formed around the entire periphery of an opening edge 142a of the circular opening (also called an injection port) of the upper vertical hole 142T, and a chamfered portion 144S formed around the entire periphery of an opening edge 142a of the circular opening (also called an injection port) of the lower vertical hole 142S. For example, the chamfered portions 144T, 144S may have a C-surface formed by C-chamfering or the like that does not limit the inclination angle relative to the sliding surfaces 140a, 140b, and may instead have an R-surface formed by curved R-chamfering or the like.

[0047] The horizontal hole 143 is formed along the radial direction of the intermediate partition plate 140. The horizontal hole 143 extends from the outer peripheral surface of the intermediate partition plate 140 toward the center O of the upper cylinder 121T (the center O of the lower cylinder 121S) in the circumferential direction of the intermediate partition plate 140, passing between the second refrigerant passage hole 136B adjacent to the vane 127 and the first refrigerant passage hole 136A adjacent to the second refrigerant passage hole 136B. The diameter of the horizontal hole 143 is formed to be several times larger than the diameter of the vertical hole 142.

[0048] (Size of vertical hole and chamfer) The diameter of vertical hole 142 is 1.5 mm or less, for example, approximately 1 mm. The width of chamfered portion 144 in the radial direction of vertical hole 142 is 0.2 mm or less, and is formed by so-called light chamfering. If the width of chamfered portions 144T, 144S (the length of chamfered portions 144T, 144S in the direction perpendicular to the depth direction of vertical hole 142) is large, a problem occurs in which compression chamber 133 and vertical hole 142 communicate with each other at unintended times during the compression stroke, as will be described later.

[0049] Compared to the diameter of vertical hole 142, bolt hole 177 has a diameter of approximately 7 mm, positioning through hole 178 has a diameter of approximately 3 mm, first refrigerant passage hole 136A has a diameter of approximately 6.5 mm, and second refrigerant passage hole 136B has a diameter of approximately 7.5 mm. Because the diameter of vertical hole 142 is smaller than the diameters of other holes such as bolt hole 177, it is difficult to insert a brush into vertical hole 142 to remove chips (cutting debris) adhering to sliding surfaces 140a, 140b and the inner circumferential surfaces of bolt hole 177, making it difficult to properly remove burrs that have formed in vertical hole 142. In this embodiment, chamfered portion 144 is formed on opening edge 142a of vertical hole 142, thereby preventing burrs from remaining in vertical hole 142. The specific mechanism by which burrs are prevented from remaining in this embodiment will be described later.

[0050] 5, an injection pipe 146 for sending liquid refrigerant to the upper compression chamber 133T and the lower compression chamber 133S is fitted into the horizontal hole 143 of the injection hole 141. A guide pipe 148 is fixed to the compressor main body vessel 10 by brazing, and the injection pipe 146 is passed through the inside of the guide pipe 148 and fixed to the guide pipe 148 by brazing. One end of the injection pipe 146 passes through the guide pipe 148 and is drawn out to the outer periphery of the compressor main body vessel 10, and is connected to an injection connecting pipe 147 into which liquid refrigerant is introduced from the refrigerant circulation path. In the rotary compressor 1, the liquid refrigerant supplied from the injection pipe 146 is injected into the upper compression chamber 133T from the injection port of the upper vertical hole 142T of the injection hole 141 of the intermediate partition plate 140, and is also injected into the lower compression chamber 133S from the injection port of the lower vertical hole 142S of the injection hole 141, thereby lowering the temperature of the refrigerant in the latter part of the compression process and thereby increasing the compression efficiency of the refrigerant.

[0051] (Piston revolution) 6A, 6B, 6C, and 6D are cross-sectional views illustrating the revolution of the piston 125 in the compression section 12 of the rotary compressor 1 of the embodiment. For convenience, the upper cylinder chamber 130T and the lower cylinder chamber 130S will hereinafter be referred to as the cylinder chamber 130, the upper suction hole 135T and the lower suction hole 135S will hereinafter be referred to as the suction hole 135, the upper suction chamber 131T and the lower suction chamber 131S will hereinafter be referred to as the suction chamber 131, and the upper compression chamber 133T and the lower compression chamber 133S will hereinafter be referred to as the compression chamber 133.

[0052] In terms of the circumferential angle around the center O of the cylinder 121, the circumferential angle at which the center line L in the thickness direction of the upper vane 127T (lower vane 127S) is located when viewed from the center O of the upper cylinder 121T (lower cylinder) is set to 0 degrees, and as shown in Figures 6A to 6D, when the shaft 15 rotates clockwise, the upper piston 125T (lower piston 125S) revolves clockwise (in the R direction).

[0053] Figures 6A, 6B, 6C and 6D show the changes in the upper compression chamber 133T (lower compression chamber 133S) when the upper piston (lower piston) revolves at circumferential angles of the upper cylinder 121T (lower cylinder 121S) of 0 degrees, 90 degrees, 180 degrees and 270 degrees, that is, when the outer peripheral surface of the upper piston 125T (lower piston 125S) comes into contact with the inner peripheral surface of the upper cylinder 121T (lower cylinder 121S) at each circumferential angle position.

[0054] As shown in Figure 6A, when the upper piston 125T (lower piston 125S) is positioned at a circumferential angle of 0 degrees (360 degrees) (when the piston 125 is at top dead center), the injection port of the upper vertical hole 142T (lower vertical hole 142S) of the injection hole 141 is blocked by the end face 125c (see Figure 8C) of the upper piston 125T (lower piston 125S), i.e., the end face 125c that slides against the sliding surfaces 140a, 140b of the intermediate partition plate 140.

[0055] 6B and 6C, when the upper piston 125T (lower piston 125S) is positioned at a circumferential angle range of approximately 90 degrees to 180 degrees, the injection port of the upper vertical hole 142T (lower vertical hole 142S) of the injection hole 141 is positioned on the outer circumferential side of the upper piston 125T (lower piston 125S) and is therefore open to the upper compression chamber 133T (lower compression chamber 133S), making it possible to inject liquid refrigerant. At this time, the liquid refrigerant is injected from the injection port of the upper vertical hole 142T (lower vertical hole 142S) of the injection hole 141, and the refrigerant in the compression process is cooled by a mist of liquid refrigerant.

[0056] As shown in Figures 6D and 6A, when the upper piston 125T (lower piston 125S) is positioned at a position where the circumferential angle is in the angular range of approximately 270 degrees to approximately 360 degrees, the injection port of the upper vertical hole 142T (lower vertical hole 142S) of the injection hole 141 is blocked by the end face 125c of the upper piston 125T (lower piston 125S), thereby stopping the injection of liquid refrigerant.

[0057] The positions of the injection port and chamfered portion 144T (144S) of the upper vertical hole 142T (lower vertical hole 142S) of the injection hole 141 on the sliding surface 140a (140b) of the intermediate partition plate 140 will be described below.

[0058] (cylinder intake area) 7A is a plan view showing an example of suction chamber 131 formed when piston 125 revolves in the embodiment. Fig. 7A shows, as an example, suction chamber 131 formed when piston 125 is positioned at a circumferential angle of 180 degrees. As shown in Figs. 6A to 6D, suction chamber 131 formed when piston 125 revolves continuously changes position and shape as piston 125 revolves. In other words, while piston 125 revolves once along the inner circumferential surface of cylinder 121, suction chamber 131 moves while changing shape.

[0059] Fig. 7B is a plan view showing suction region 300 formed during one revolution of piston 125 in the embodiment. Suction region 300 shown in Fig. 7B is the path traced by suction chamber 131 shown in Fig. 7A as it changes position and shape during the revolution of piston 125. When viewed from the top-bottom direction of compression section 12, suction region 300 is the region obtained by projecting the path traveled by suction chamber 131, whose position and shape change with the revolution of piston 125, onto sliding surfaces 140a, 140b of intermediate partition plate 140.

[0060] When viewed from the top-bottom direction of compression section 12 (the axial direction of shaft 15), suction area 300 extends from side surface 127a of vane 127 on the suction hole 135 side along the inner circumferential surface of cylinder 121. When the width of suction area 300 in the radial direction of cylinder 121 is defined as radial width W, radial width W of suction area 300 is constant when the circumferential angle of cylinder 121 is in the range of 0 to 180 degrees, and gradually decreases along the direction of revolution of piston 125 (direction R) when the circumferential angle is in the range of 180 to 360 degrees. Here, the radial width W that is constant when the circumferential angle is in the range of 0 to 180 degrees corresponds to the difference between the diameter of the inner circumferential surface of cylinder 121 and the outer diameter of piston 125.

[0061] If the vertical hole 142 and chamfered portion 144 of the injection hole 141 were arranged in the above-mentioned suction region 300, liquid refrigerant would not be injected from the vertical hole 142 into the compression chamber 133, but would be injected from the vertical hole 142 and the chamfered portion 144 into the suction chamber 131, which could cause the refrigerant drawn into the suction chamber 131 to flow out through the suction hole 135. For this reason, the vertical hole 142 and the chamfered portion 144 of the injection hole 141 are not suitable for the suction region 300 as a location, and are instead provided in a region of the sliding surfaces 140a, 140b in the cylinder chamber 130 excluding the suction region 300 in the cylinder chamber 130.

[0062] Hereinafter, in the two-cylinder rotary compressor 1 of the embodiment, of the upper and lower sliding surfaces 140a, 140b of the intermediate partition plate 140, the suction area 300 on the sliding surface 140a in the upper cylinder chamber 130T will be referred to as the upper suction area 300T, and the suction area 300 on the sliding surface 140b in the lower cylinder chamber 130S will be referred to as the lower suction area 300S.

[0063] (Inner circumference area of ​​the piston) Fig. 8A is a plan view showing, in an embodiment, a circular area on the inner periphery of piston 125 that is formed when piston 125 revolves. Fig. 8A shows, as an example, circular area 301 on the inner periphery of end face 125c of piston 125 that is formed when piston 125 is positioned at a circumferential angle of 0 degrees when viewed from the vertical direction of compression section 12 (the axial direction of shaft 15).

[0064] Fig. 8B is a plan view showing inner peripheral region 302 formed during one revolution of piston 125 in the embodiment. Inner peripheral region 302 shown in Fig. 8B is a locus that is traced by continuously changing the position of inner peripheral circular region 301 of end face 125c of piston 125 shown in Fig. 8A during one revolution of piston 125. When viewed from the top-bottom direction of compression section 12, inner peripheral region 302 is a region where the locus of change of circular region 301 is projected onto sliding surfaces 140a, 140b of intermediate partition plate 140.

[0065] 8C is a longitudinal cross-sectional view showing a main portion of piston 125. As shown in Fig. 8C, chamfered portions 125d are formed at the corners between inner circumferential surface 125b and both end faces 125c of piston 125. When viewed in the axial direction of shaft 15, chamfered portions 125d on the inner circumferential side of piston 125 are included in circular area 301 on the inner circumferential side of end faces 125c of piston 125.

[0066] If the vertical hole 142 and chamfered portion 144 of the injection hole 141 were located in the inner peripheral region 302, liquid refrigerant would be sprayed from the vertical hole 142 onto the inside of the end face 125c of the piston 125, and the liquid refrigerant would potentially leak out from a gap around the shaft 15 provided on the inner peripheral side of the piston 125. For this reason, the inner peripheral region 302 is not a suitable location for the vertical hole 142 and the chamfered portion 144 of the injection hole 141, and they are provided in a region of the sliding surfaces 140a, 140b in the cylinder chamber 130 excluding the inner peripheral region 302.

[0067] Hereinafter, in the two-cylinder rotary compressor 1 of the embodiment, of the upper and lower sliding surfaces 140a, 140b of the intermediate partition plate 140, the inner peripheral region 302 on the sliding surface 140a in the upper cylinder chamber 130T will be referred to as the upper inner peripheral region 302T, and the inner peripheral region 302 on the sliding surface 140b in the lower cylinder chamber 130S will be referred to as the lower inner peripheral region 302S.

[0068] 8A, the eccentricity of the upper eccentric portion 152T relative to the intermediate shaft portion 150 (i.e., the eccentricity of the center of the upper eccentric portion 152T relative to the center O of the cylinder 121) and the eccentricity of the lower eccentric portion 152S relative to the intermediate shaft portion 150 (i.e., the eccentricity of the center of the lower eccentric portion 152S relative to the center O of the cylinder 121) are both denoted by C, and the radii of the upper eccentric portion 152T and the lower eccentric portion 152S are both denoted by E. The diameter of the upper eccentric portion 152T matches the inner diameter of the upper piston 125T, and the diameter of the lower eccentric portion 152S matches the inner diameter of the lower piston 125S. Furthermore, the width of the chamfered portion 125d on the inner periphery of the piston 125 in the radial direction of the piston 125, i.e., the length of the chamfered portion 125d along the direction perpendicular to the depth direction of the vertical hole 142, is denoted by F (see FIG. 8C). In other words, the width F of the chamfered portion 125d of the upper piston 125T is the length in the radial direction of the upper piston 125T between the inner peripheral edge of the end face 125c of the upper piston 125T and the inner peripheral surface 125b of the upper piston 125T. Similarly, the width F of the chamfered portion 125d of the lower piston 125S is the length in the radial direction of the lower piston 125S between the inner peripheral edge of the end face 125c of the lower piston 125S and the inner peripheral surface 125b of the lower piston 125S. In this case, the upper inner peripheral region 302T is a circular region whose radius D from the center O of the upper cylinder 121T satisfies D = (C + E + F). Similarly, the lower inner peripheral region 302S is a circular region whose radius D from the center O of the lower cylinder 121S satisfies D = (C + E + F).

[0069] (First range) FIG. 9 is a schematic diagram showing a first region 305 in which the vertical hole 142 and chamfered portion 144 of the injection hole 141 are located in a single-cylinder rotary compressor. As shown in FIG. 9, the vertical hole 142 and chamfered portion 144 of the injection hole 141 are located in a region that excludes the suction region 300 and the inner peripheral region 302, which are not suitable for the location of the vertical hole 142 and the chamfered portion 144, from the range of the sliding surfaces 140a and 140b in the cylinder chamber 130. In other words, when the region surrounded by the suction region 300, the inner peripheral region 302, and the side surface 127b of the vane 127 is defined as the first region 305, the injection port of the vertical hole 142 and the chamfered portion 144 are formed to be located in the first region 305. The side surface 127b of the vane 127 is located on the opposite side from the suction hole 135 when viewed from the top-bottom direction of the compression section 12.

[0070] In the case of a one-cylinder rotary compressor, the injection port and chamfered portion 144 of the vertical hole 142 are positioned in the first range 305, thereby preventing the liquid refrigerant from flowing out of the vertical hole 142 to the suction hole 135 or the inner side of the piston 125, and enabling the liquid refrigerant to be injected into the compression chamber 133 at the appropriate timing during the compression of the refrigerant.

[0071] Although this embodiment describes a two-cylinder rotary compressor 1, a one-cylinder rotary compressor in which the vertical hole 142 and chamfered portion 144 of the injection hole 141 are located in the first region 305 described above is also included in the present invention. In the case of a one-cylinder rotary compressor, the injection port of the vertical hole and the chamfered portion are arranged within the first region 305 on the sliding surface of the upper end plate or the sliding surface of the lower end plate. For example, the upper end plate is formed so that the injection port of the vertical hole and the chamfered portion are located in the first region 305 shown in FIG. 9 on the sliding surface on which the end face of the piston slides.

[0072] Hereinafter, in the two-cylinder rotary compressor 1 of the embodiment, of the upper and lower sliding surfaces 140a, 140b of the intermediate partition plate 140, the first region 305 on the sliding surface 140a in the upper cylinder chamber 130T will be referred to as the upper first region 305T, and the first region 305 on the sliding surface 140b in the lower cylinder chamber 130S will be referred to as the lower first region 305S. In other words, the region surrounded by the upper suction region 300T, the upper inner peripheral region 302T, and the side surface 127b of the upper vane 127T will be referred to as the upper first region 305T, and similarly, the region surrounded by the lower suction region 300S, the lower inner peripheral region 302S, and the side surface 127b of the lower vane 127S will be referred to as the lower first region 305S.

[0073] In the case of a two-cylinder rotary compressor 1, the vertical hole 142 and chamfered portion 144 of the injection hole 141 are arranged in the upper third range 308T and the lower third range 308S (Figure 11) from the sliding surfaces 140a, 140b in the upper cylinder chamber 130T and the lower cylinder chamber 130S, excluding the second range 307 (Figure 10B) described later.

[0074] (Second range) 10A is a schematic diagram showing an example of an overlapping range 306 between the upper cylinder chamber 130T and the lower cylinder chamber 130S when viewed from the vertical direction of the compression unit 12 (the axial direction of the shaft 15) when the upper piston 125T and the lower piston 125S revolve. Fig. 10A shows, as an example, the overlapping range 306 between the upper cylinder chamber 130T and the lower cylinder chamber 130S when the upper piston 125T is positioned at a circumferential angle of 45 degrees. In other words, the range 306 shown in Fig. 10A indicates the range in which the upper cylinder chamber 130T and the lower cylinder chamber 130S of the compression unit 12 communicate with each other through the upper vertical hole 142T and the lower vertical hole 142S of the intermediate partition plate 140.

[0075] Fig. 10B is a schematic diagram showing a second range 307 formed during one revolution of the upper piston 125T and the lower piston 125S in the embodiment. The second range 307 shown in Fig. 10B is a locus that is traced while the position of the range 306 where the upper cylinder chamber 130T and the lower cylinder chamber 130S shown in Fig. 10A overlaps changes continuously during one revolution of the upper piston 125T and the lower piston 125S.

[0076] 10A and 10B, the distance from the center P of the upper piston 125T to the outer circumferential surface of the upper piston 125T and the distance from the center P of the lower piston 125S to the outer circumferential surface of the lower piston 125S are both defined as the piston outer circumferential surface radius B. In this case, if the radius from the center O of the upper cylinder 121T and the radius from the center O of the lower cylinder 121S are each defined as A, then B corresponds to the hypotenuse of a right triangle, and A and C correspond to the two sides other than the hypotenuse of the right triangle, and therefore, according to Pythagoras' theorem, B 2 =A 2 +C 2 Therefore, the second range 307 is A=(B 2 -C 2 ) 0.5 The circular area that satisfies the above condition is an annular range along the inner circumferential surface of the upper cylinder 121T and the inner circumferential surface of the lower cylinder 121S, excluding the circular area of ​​the sliding surface 140a in the upper cylinder chamber 130T and the circular area of ​​the sliding surface 140b in the lower cylinder chamber 130S, respectively.

[0077] If the vertical hole 142 and chamfered portion 144 of the injection hole 141 were arranged in the above-mentioned second range 307, there is a risk that the refrigerant in the upper compression chamber 133T would flow through the upper vertical hole 142T and the lower vertical hole 142S into the lower compression chamber 133S, or that the refrigerant in the lower compression chamber 133S would flow through the lower vertical hole 142S and the upper vertical hole 142T into the upper compression chamber 133T. For this reason, the second range 307 is not suitable as a position for the upper vertical hole 142T, the lower vertical hole 142S, and the chamfered portions 144T, 144S of the injection hole 141, and they are provided in an area excluding the second range 307 from the range of the sliding surfaces 140a, 140b in the cylinder chamber 130.

[0078] (Third range) Fig. 11 is a schematic diagram showing the upper third area 308T and the lower third area 308S in which the vertical hole 142 and the chamfered portion 144 of the injection hole 141 are located in the two-cylinder rotary compressor 1 of the embodiment. Fig. 12 is a schematic diagram showing an enlarged view of the upper third area 308T and the lower third area 308S in the embodiment.

[0079] 11 , the area obtained by excluding the second area 307 from the upper first area 305T is referred to as the upper third area 308T, and the area obtained by excluding the second area 307 from the lower first area 305S is referred to as the lower third area 308S. At this time, the ejection port of the upper vertical hole 142T and its chamfered portion 144T on the sliding surface 140a in the upper cylinder chamber 130T are located in the upper third area 308T, and the ejection port of the lower vertical hole 142S and its chamfered portion 144S on the sliding surface 140b in the lower cylinder chamber 130S are located in the lower third area 308S.

[0080] This prevents the refrigerant being compressed in the two-cylinder rotary compressor 1 from flowing between the upper compression chamber 133T and the lower compression chamber 133S through the vertical hole 142 and the chamfered portion 144, allowing liquid refrigerant to be appropriately injected into the upper compression chamber 133T and the lower compression chamber 133S during compression of the refrigerant.

[0081] As shown in FIG. 12 , the boundary line 310 of the upper third region 308T and the boundary line 310 of the lower third region 308S include an outer boundary line 311 on a circumference of radius A from the center O of the upper cylinder 121T (lower cylinder 121S) and an inner boundary line 312 on a circumference of radius D from the center O of the upper cylinder 121T (lower cylinder 121S). In the radial direction of the upper cylinder 121T (lower cylinder 121S), the outer boundary line 311 is the outermost boundary line 310, and the inner boundary line 312 is the innermost boundary line 310. The outer diameters of the chamfered portions 144T of the upper vertical hole 142T and the chamfered portions 144S of the lower vertical hole 142S are smaller than (AD). That is, the chamfered portions 144 are formed so as not to include a portion located on the outer periphery beyond the outer boundary line 311 and a portion located on the inner periphery beyond the inner boundary line 312 in the radial direction of the cylinder 121.

[0082] (Manufacturing method of rotary compressor) The manufacturing method of the rotary compressor 1 of the embodiment includes a step of forming the above-described injection hole 141 in the intermediate partition plate 140, and this step includes forming a chamfered portion 144 around the entire periphery of the opening edge 142a of the injection port of the vertical hole 142, i.e., forming the vertical hole 142 having the chamfered portion 144. Fig. 13 is a schematic diagram for explaining the step of forming the injection hole 141 of the embodiment. Fig. 14 is a flowchart for explaining the step of forming the injection hole 141 of the embodiment.

[0083] As shown in Figures 13 and 14, the process of forming the injection hole 141 includes the steps of forming a vertical hole 142 in the intermediate partition plate 140 (step S1), chamfering the opening edge 142a of the vertical hole 142 after forming the vertical hole 142 to form a chamfered portion 144 (step S2), forming a horizontal hole 143 in the intermediate partition plate 140 so as to connect to the vertical hole 142 (step S3), and mirror-finishing the sliding surfaces 140a, 140b where the vertical hole 142 opens after forming the horizontal hole 143 (i.e., after chamfering) (step S4).

[0084] In the process of drilling the vertical holes 142, a drill 181 is passed through the intermediate partition plate 140 in the thickness direction to continuously form an upper vertical hole 142T and a lower vertical hole 142S that penetrate the intermediate partition plate 140. At this time, for example, by drilling from the sliding surface 140a toward the sliding surface 140b of the intermediate partition plate 140, burrs 185 are generated on the opening edge 142a of the lower vertical hole 142S and the opening edge 142a of the upper vertical hole 142T. The burrs 185 generated on the lower vertical hole 142S and the upper vertical hole 142T in the process of drilling the vertical holes 142 are appropriately removed by chamfering the lower vertical hole 142S using the drill 182.

[0085] In the drilling process of the horizontal hole 143, the horizontal hole 143 is formed from the outer peripheral surface of the intermediate partition plate 140 along the radial direction of the intermediate partition plate 140 to connect to the upper vertical hole 142T and the lower vertical hole 142S. The mirror polishing process is a process of performing finish polishing using a grindstone, abrasive material, etc. (not shown) to form the sliding surfaces 140a, 140b of the intermediate partition plate 140. In the embodiment, as shown in FIG. 17A, the surfaces that will become the sliding surfaces 140a and 140b are first chamfered by polishing, and then a mirror polishing process is performed after the chamfering (i.e., with the chamfered portion 144 formed on the opening edge 142a of the vertical hole 142). This makes it possible to prevent burrs from being generated that would block the opening edge 142a of the vertical hole 142 due to friction with the tool used to perform the mirror polishing, compared to the comparative example described below, in which mirror polishing is performed with only vertical holes 142 (lower vertical hole 142S and upper vertical hole 142T) that are parallel to the axial direction of the shaft 15 formed. Furthermore, in the embodiment, even if tiny burrs are generated near the upper end of the chamfered portion 144 due to the mirror polishing, in the brushing process carried out after the finish polishing (a process in which a rotating brush brushes away chips (cutting debris) and the like adhering to the sliding surfaces 140a, 140b), the chamfered portion 144 formed on the opening edge 142a of the vertical hole 142 makes it easier for the bristles of the brush to get under the burr, and the burr can be properly removed simply by brushing.

[0086] In this way, in the manufacturing method of the rotary compressor 1 of the embodiment, in the process of forming the injection hole 141, by forming a chamfered portion 144 around the entire circumference of the opening edge 142a of the injection port of the vertical hole 142, it is possible to prevent burrs from occurring on the opening edge 142a of the vertical hole 142.Furthermore, even if tiny burrs do occur on the opening edge 142a of the vertical hole 142, the burrs can be easily and appropriately removed simply by brushing after mirror finishing (finish polishing), thereby preventing burrs from remaining on the opening edge 142a of the vertical hole 142.

[0087] (Comparative Manufacturing Method) As shown in FIG. 17B , the manufacturing method of the rotary compressor of the comparative example differs from the manufacturing method of the rotary compressor 1 of the embodiment in that, without chamfering, only the vertical holes 142 (lower vertical hole 142S and upper vertical hole 142T) parallel to the axial direction of the shaft 15 are formed, and then mirror-finishing is performed. In the manufacturing method of the rotary compressor of the comparative example, when mirror-finishing the vicinity of the opening edge 142a of the vertical hole 142, friction between the tool (not shown) performing the mirror-finishing and the sliding surfaces 140a and 140b is large, resulting in burrs that clog the opening edge 142a of the vertical hole 142. Furthermore, the vertical hole 142 serving as the injection hole 141 has a diameter of 1.5 mm or less, which is smaller than other holes such as the bolt hole 177. Therefore, even if a brushing process is performed after finish polishing, the bristles of a rotating brush do not sufficiently enter the vertical hole 142, and the burrs cannot be adequately removed. Therefore, in the manufacturing method of the rotary compressor of the comparative example, there is a risk that burrs may remain on the opening edge 142a of the vertical hole 142.

[0088] (Another example of the process for forming injection holes) Fig. 15 is a schematic diagram for explaining another example of the process for forming the injection hole 141 in the embodiment. Fig. 16 is a flowchart for explaining another example of the process for forming the injection hole 141 in the embodiment.

[0089] As shown in Figures 15 and 16, another example of the process for forming the injection hole 141 includes a process (step S5) of previously chamfering the portion of the sliding surfaces 140a, 140b where the opening edge 142a of the vertical hole 142 is to be formed to form a chamfered portion 144, a process (step S6) of forming the vertical hole 142 after the chamfering, a process (step S7) of forming a horizontal hole 143 in the intermediate partition plate 140 so as to connect to the vertical hole 142, and a process (step S8) of mirror-finishing the sliding surfaces 140a, 140b after forming the vertical hole 142 and the horizontal hole 143.

[0090] The step of chamfering the portion where opening edge 142a of vertical hole 142 is to be formed in advance refers to forming a conical recess 145 including chamfered portion 144 using drill 183 at the position where vertical hole 142 is to be formed. In the step of drilling vertical hole 142, by forming recess 145 including chamfered portion 144 and then forming vertical hole 142 using drill 181, it is possible to prevent burrs from being generated on opening edge 142a of the injection port of vertical hole 142.

[0091] As described above, in the manufacturing method of the rotary compressor 1 of the embodiment, in the step of forming the injection hole 141, the vertical hole 142 is formed after the chamfered portion 144 is formed, so that burrs are less likely to occur on the opening edge 142a of the injection port (vertical hole 142) even if mirror finishing is performed after the formation of the vertical hole 142. In other words, it is possible to prevent burrs from remaining on the opening edge 142a of the vertical hole 142.

[0092] (Effects of the Example) As described above, the compression section 12 of the rotary compressor 1 of the embodiment includes the annular cylinder 121 having the cylinder chamber 130 formed therein, the annular piston 125 disposed in the cylinder chamber 130, the intermediate partition plate 140 which is an end plate closing the end of the cylinder 121, and the injection hole 141 provided in the intermediate partition plate 140 to inject refrigerant into the cylinder chamber 130. The injection hole 141 has a vertical hole 142 extending along the rotational axis direction of the motor 11 (the axial direction of the shaft 15), and the vertical hole 142 opens to sliding surfaces 140a, 140b of the intermediate partition plate 140 along which the piston 125 slides, and has a chamfered portion 144 formed around the entire periphery of the opening edge 142a of the injection port (vertical hole 142). In this way, vertical hole 142 of injection hole 141 has chamfered portion 144 formed around the entire circumference of opening edge 142a of the injection port (vertical hole 142), and thus, for example, by forming chamfered portion 144 around the entire circumference of opening edge 142a of vertical hole 142 in the process of forming injection hole 141, it is possible to prevent burrs from remaining on opening edge 142a of vertical hole 142. As a result, in rotary compressor 1, for example, during compression of the refrigerant, it is possible to prevent burrs from entering compression chamber 133 together with the refrigerant injected from vertical hole 142, which would damage compression section 12.

[0093] Furthermore, in the rotary compressor 1 of the embodiment, when viewed from the up-and-down direction of compression section 12 (the axial direction of shaft 15), the path that suction chamber 131 traces while piston 125 revolves once along the inner circumferential surface of cylinder 121 is defined as suction region 300, the path that circular region 301 traces on the inner circumferential side of end face 125c of piston 125 during one rotation of piston 125 is defined as inner circumferential region 302, and the region surrounded by suction region 300, inner circumferential region 302, and side surface 127b of vane 127 is defined as first region 305, and chamfered portion 144 is located in first region 305. This prevents liquid refrigerant from leaking from vertical hole 142 to suction hole 135 or the inner circumferential side of piston 125 in the one-cylinder rotary compressor, and allows liquid refrigerant to be injected into compression chamber 133 at appropriate timing during refrigerant compression.

[0094] Furthermore, in the rotary compressor 1 of the embodiment, when viewed from the vertical direction of the compression section 12 (axial direction of the shaft 15), the area surrounded by the upper suction area 300T, the upper inner peripheral area 302T, and the side surface 127b of the upper vane 127T is defined as the upper first range 305T, the area surrounded by the lower suction area 300S, the lower inner peripheral area 302S, and the side surface 127b of the lower vane 127S is defined as the lower first range 305S, the trajectory drawn by the area 306 where the upper cylinder chamber 130T and the lower cylinder chamber 130S overlap during one revolution of the upper piston 125T and the lower piston 125S is defined as the second range 307, the area excluding the second range 307 from the upper first range 305T is defined as the upper third range 308T, and the area excluding the second range 307 from the lower first range 305S is defined as the lower third range 308S. At this time, the chamfered portion 144T of the upper vertical hole 142T is located in the upper third range 308T, and the chamfered portion 144S of the lower vertical hole 142S is located in the lower third range 308S. This prevents the refrigerant being compressed from flowing between the upper compression chamber 133T and the lower compression chamber 133S through the vertical hole 142 and the chamfered portion 144, so that the liquid refrigerant can be appropriately injected into the upper compression chamber 133T and the lower compression chamber 133S during compression of the refrigerant.

[0095] Furthermore, in the rotary compressor 1 of the embodiment, the diameter of the vertical holes 142 (142T, 142S) of the injection hole 141 is 1.5 mm or less. In this way, the vertical holes 142, into which it is particularly difficult to insert a brush, have the chamfered portions 144. By forming the chamfered portions 144 on the opening edges 142a of the vertical holes 142 in the process of forming the injection holes 141, for example, it is possible to prevent burrs from remaining on the opening edges 142a of the vertical holes 142. [Explanation of symbols]

[0096] 1 Rotary compressor 10 Compressor main body container 11 Motor 12 Compression section 15 shaft 121 cylinders 121T Upper cylinder (cylinder) 121S Lower Cylinder (Cylinder) 125 piston 125c end face 125T upper piston (piston) 125S Lower Piston (Piston) 127 Vane 127a, 127b side 127T Upper vane (vane) 127S Lower vane (vane) 130 Cylinder chamber 130T Upper cylinder chamber (cylinder chamber) 130S Lower cylinder chamber (cylinder chamber) 131 Suction chamber 131T Upper suction chamber (suction chamber) 131S Lower suction chamber (suction chamber) 133 Compression Chamber 133T Upper compression chamber (compression chamber) 133S Lower compression chamber (compression chamber) 135 Suction hole 135T Upper suction hole (suction hole) 135S Lower suction hole (suction hole) 140 Intermediate partition plate (end plate) 140a, 140b sliding surface 141 injection hole 142 Vertical Hole 142a Opening edge 142T Upper vertical hole 142S Lower vertical hole 143 Side Cave 144, 144T, 144S chamfered section 150 Intermediate shaft 152T upper eccentric part 152S lower eccentric part 160T Upper end plate (end plate) 160S Lower end plate (end plate) 300 inhalation area 300T upper suction area 300S lower suction area 301 Circular Area 302 Inner area 302T Upper inner area 302S Lower inner area 305 First Range 305T Upper 1st range 305S Lower 1st Range 306 Overlapping Range 307 Second Range 308T Upper 3rd range 308S Lower 3rd Range 310 Borderline 311 Outer boundary line 312 Inner boundary line A is the radius of the circular area B Piston outer surface radius C Eccentricity D Radius of the upper inner periphery area and the lower inner periphery area E Radius of shaft center F distance O Center (center of cylinder)

Claims

1. a compressor body container accommodating the compression unit and the motor, wherein the compression unit has an annular cylinder having a cylinder chamber formed therein, an annular piston disposed in the cylinder chamber, an end plate closing an end of the cylinder, and an injection hole provided in the end plate for injecting refrigerant into the cylinder chamber, the injection hole having a vertical hole extending along a rotational axis direction of the motor, the vertical hole opening on a sliding surface of the end plate along which the piston slides, In the step of forming the injection hole in the end plate, a chamfer is formed around the entire periphery of the opening edge of the vertical hole. A manufacturing method for a rotary compressor.

2. The step of forming the injection hole in the end plate includes: forming the longitudinal hole in the end plate; After forming the vertical hole, chamfering the opening edge of the vertical hole to form the chamfered portion; After the chamfering, the sliding surface is mirror-finished. A method for manufacturing the rotary compressor according to claim 1.

3. The step of forming the injection hole in the end plate includes: forming the chamfered portion by chamfering a portion of the sliding surface where an opening edge of the vertical hole is to be formed; forming the vertical hole after the chamfering; After forming the vertical hole, the sliding surface is mirror-finished. A method for manufacturing the rotary compressor according to claim 1.

4. a compressor unit that compresses a refrigerant, a motor that drives the compression unit, and a compressor main body container that houses the compression unit and the motor therein; the compression unit is a rotary compressor having an annular cylinder having a cylinder chamber formed therein, an annular piston disposed in the cylinder chamber, an end plate closing an end of the cylinder, and an injection hole provided in the end plate for injecting refrigerant into the cylinder chamber, the injection hole has a vertical hole extending along the rotational axis direction of the motor, the vertical hole opening on the sliding surface of the end plate on which the piston slides, and a chamfered portion formed around the entire periphery of the opening edge of the vertical hole. Rotary compressor.

5. the compression section has a vane that moves back and forth within the cylinder chamber while contacting the piston, dividing the cylinder chamber into a suction chamber and a compression chamber, On the sliding surface in the cylinder chamber, When viewed from the top and bottom of the compression section, a path traced by the suction chamber while the piston makes one revolution along the inner circumferential surface of the cylinder is defined as a suction region, a path traced by a circular area on the inner circumferential side of the end face of the piston while the piston makes one revolution is defined as an inner circumferential region, and a region surrounded by the suction region, the inner circumferential region, and a side surface of the vane is defined as a first region, The chamfered portion is located in the first range. The rotary compressor according to claim 4.

6. the compression section includes an upper cylinder having an upper cylinder chamber, a lower cylinder having a lower cylinder chamber, a partition plate serving as the end plate separating the upper cylinder chamber and the lower cylinder chamber, an upper piston disposed in the upper cylinder chamber, a lower piston disposed in the lower cylinder chamber, an upper vane that moves back and forth within the upper cylinder chamber while in contact with the upper piston to divide the upper cylinder chamber into an upper suction chamber and an upper compression chamber, and a lower vane that moves back and forth within the lower cylinder chamber while in contact with the lower piston to divide the lower cylinder chamber into a lower suction chamber and a lower compression chamber, the injection hole has an upper vertical hole that opens to an upper sliding surface of the partition plate on which the upper piston slides, and a lower vertical hole that opens to a lower sliding surface of the partition plate on which the lower piston slides, the upper piston and the lower piston revolve along the inner circumferential surfaces of the upper cylinder and the lower cylinder with a phase difference of 180 degrees, On the sliding surface in the upper cylinder chamber, When viewed from the top-bottom direction of the compression section, a path traced by the upper suction chamber while the upper piston revolves along the inner peripheral surface of the upper cylinder is defined as an upper suction region, a path traced by a circular area on the inner peripheral side of the end face of the upper piston while the upper piston revolves is defined as an upper inner peripheral region, and a region surrounded by the upper suction region, the upper inner peripheral region, and a side surface of the upper vane is defined as an upper first region, On the sliding surface in the lower cylinder chamber, When viewed from the top-bottom direction of the compression section, a locus described by the lower suction chamber while the lower piston revolves along the inner peripheral surface of the lower cylinder is defined as a lower suction region, a locus described by a circular area on the inner peripheral side of the end face of the lower piston while the lower piston revolves is defined as a lower inner peripheral region, and a region surrounded by the lower suction region, the lower inner peripheral region, and a side surface of the lower vane is defined as a lower first region, a second range is a range where the upper cylinder chamber and the lower cylinder chamber overlap each other while the upper piston and the lower piston revolve, when viewed from the top-bottom direction of the compression section; When a region obtained by excluding the second range from the upper first range is defined as an upper third range, and a region obtained by excluding the second range from the lower first range is defined as a lower third range, The chamfered portion of the upper vertical hole is located in the upper third range, and the chamfered portion of the lower vertical hole is located in the lower third range. The rotary compressor according to claim 4.

7. The cylinder has an intake hole formed in the inner peripheral surface of the cylinder, In the circumferential angle around the center of the cylinder, the circumferential angle at which the vane is positioned when viewed from the center of the cylinder is defined as 0 degrees, When the width of the intake area in the radial direction of the cylinder is defined as the radial width, The suction area extends from the side surface of the vane on the suction hole side along the inner circumferential surface of the cylinder, and the radial width of the suction area is constant when the circumferential angle is in the range of 0 degrees to 180 degrees, and the radial width of the suction area gradually decreases along the direction of revolution of the piston when the circumferential angle is in the range of 180 degrees to 360 degrees. The rotary compressor according to claim 5 .

8. the compression unit has a shaft that is rotated by the motor; the shaft has an upper eccentric portion into which the upper piston is fitted, a lower eccentric portion into which the lower piston is fitted, and an intermediate shaft portion formed between the upper eccentric portion and the lower eccentric portion, When the amount of eccentricity of each of the upper eccentric portion and the lower eccentric portion relative to the intermediate shaft portion is C, the radius of each of the upper eccentric portion and the lower eccentric portion is E, and the distance between the inner peripheral edge of the end face of the upper piston in the radial direction of the upper piston and the outer peripheral surface of the upper eccentric portion, and the distance between the inner peripheral edge of the end face of the lower piston in the radial direction of the lower piston and the outer peripheral surface of the lower eccentric portion are both F, The upper inner peripheral region and the lower inner peripheral region are both circular regions that satisfy D=(C+E+F), where D is the radius from the center of the upper cylinder and D is the radius from the center of the lower cylinder. The rotary compressor according to claim 6.

9. When the distance from the center of the upper piston to the outer circumferential surface of the upper piston and the distance from the center of the lower piston to the outer circumferential surface of the lower piston are both defined as the piston outer circumferential radius B, The second range is defined as A, where A is the radius from the center of the upper cylinder and A is the radius from the center of the lower cylinder, and A=(B ２ -C ２ ) ０．５ is an annular range along the inner circumferential surface of the upper cylinder and the inner circumferential surface of the lower cylinder, the circular area satisfying the following formula being excluded from the circular area of ​​the sliding surface in the upper cylinder chamber and the circular area of ​​the sliding surface in the lower cylinder chamber, The rotary compressor according to claim 8.

10. the boundary line of the upper third range and the boundary line of the lower third range include an outer boundary line on the circumference of the circle with radius A and an inner boundary line on the circumference of the circle with radius D, The outer diameter of the chamfered portion of the upper vertical hole and the lower vertical hole is smaller than (A-D). The rotary compressor according to claim 9.

11. The diameter of the vertical hole is 1.5 mm or less. The rotary compressor according to claim 4 or 5.

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