JP7852353B2 - Closed-type compressor and method for manufacturing the same - Google Patents

Description

This invention relates to a sealed compressor and a method for manufacturing the same.

A known type of compressor comprises a vertical cylindrical compressor body and accumulators arranged radially within the compressor body.

Related compressor technologies include those in which the accumulator container is positioned below the main compressor body. This placement of the accumulator container below the main compressor body allows for miniaturization of the compressor in the radial direction.

Japanese Patent Publication No. 2011-27043 Japanese Patent Publication No. 2020-109283

In the compressor described above, the refrigerant supply pipes that supply gaseous refrigerant from the accumulator container to the compression cylinders are located outside the compressor body. This creates a problem where the compressor becomes larger to accommodate the space occupied by the refrigerant supply pipes in the radial direction of the compressor body. In particular, when the compression section has an upper cylinder and a lower cylinder, the two refrigerant supply pipes connected to each cylinder are located outside the compressor body, further increasing the compressor's size relative to the radial direction of the compressor body.

The disclosed technology was developed in view of the above, and aims to provide a sealed compressor and a method for manufacturing the same that can achieve miniaturization of the compressor body container in the radial direction.

One embodiment of the sealed compressor disclosed in this application is a sealed compressor in which a compression section having an upper cylinder and a lower cylinder that compress the inhaled gaseous refrigerant and discharge it into the compressor body container is housed inside a vertical cylindrical compressor body container, and a motor that drives the compression section is housed inside the compressor body container, and an accumulator container is provided below the compressor body container that separates the inhaled refrigerant into gaseous refrigerant and liquid refrigerant and supplies the gaseous refrigerant to the compression section, wherein the compressor body container has a cylindrical main shell and a bottom shell joined to the lower end of the main shell, and the accumulator container has a cup-shaped accumulator shell and an accumulator that draws refrigerant into the inside of the accumulator shell The accumulator shell has an accumulator suction pipe , the opening side of which is joined to the compressor body container, the accumulator suction pipe extends through the accumulator shell and into the interior of the accumulator shell, and a single refrigerant supply pipe is provided inside the accumulator shell to supply gaseous refrigerant from the accumulator shell to the compression section, the refrigerant supply pipe is connected to the compression section by passing through the bottom shell of the compressor body container from inside the accumulator shell, and a refrigerant supply path is formed in the compression section to supply gaseous refrigerant from the refrigerant supply pipe to the upper compression chamber of the upper cylinder and the lower compression chamber of the lower cylinder, respectively, and the refrigerant supply pipe is connected to the refrigerant supply path. Inside the accumulator shell, the refrigerant supply pipe has a straight pipe section that extends linearly in the vertical direction of the compression section, and a curved pipe section that curves upward from the lower end of the straight pipe section. The upper end of the curved pipe section is located above the aforementioned end of the accumulator suction pipe.

According to one embodiment of the sealed compressor disclosed in this application, the compressor body container can be miniaturized in the radial direction.

Figure 1 is a longitudinal cross-sectional view showing a rotary compressor according to an embodiment. Figure 2 is an exploded perspective view showing the compression section in the embodiment. Figure 3 is a longitudinal cross-sectional view showing an enlarged view of the main part of the embodiment. Figure 4 is a longitudinal cross-sectional view showing the connection structure of the refrigerant supply pipe in the embodiment. Figure 5A is a plan view of the upper cylinder in the embodiment, seen from above. Figure 5B is a plan view of the upper cylinder in the embodiment, seen from below. Figure 6A is a plan view of the lower cylinder in the embodiment, seen from above. Figure 6B is a plan view of the lower cylinder in the embodiment, seen from below. Figure 7 is a plan view of the intermediate partition plate in the embodiment, seen from above. Figure 8 is a plan view of the lower end plate in the embodiment, seen from below. Figure 9 is a plan view of the lower end plate cover in the embodiment, seen from below. Figure 10 is a longitudinal cross-sectional view showing another example of the refrigerant supply pipe connection structure in the embodiment. Figure 11 is a longitudinal cross-sectional view illustrating the manufacturing method of the rotary compressor according to the embodiment. Figure 12 is a longitudinal cross-sectional view illustrating another example of the manufacturing method of the rotary compressor of the embodiment.

The following describes in detail, with reference to the drawings, embodiments of the sealed compressor and its manufacturing method disclosed in this application. Note that the following embodiments do not limit the sealed compressor and its manufacturing method disclosed in this application.

(Configuration of a rotary compressor)
In this embodiment, a rotary compressor will be described as an example of a closed-type compressor. Figure 1 is a longitudinal cross-sectional view showing the rotary compressor of the embodiment. Figure 2 is an exploded perspective view showing the compression section of the embodiment.

As shown in Figure 1, the rotary compressor 1 is an internal high-pressure, sealed compressor that houses a compression unit 12 inside the compressor body container 10. The compression unit 12 draws in refrigerant from the refrigerant supply pipe 31, compresses the refrigerant, and discharges the compressed refrigerant into the compressor body container 10. The high-pressure refrigerant compressed by the compression unit 12 is discharged into the compressor body container 10 and further discharged into the refrigeration cycle through the discharge pipe 107.

As shown in Figure 1, the compressor body container 10 has a vertical cylindrical main shell 10a, a cup-shaped top shell 10b, and a cup-shaped bottom shell 10c. The compressor body container 10 is constructed by welding the opening side 10g of the top shell 10b to the upper end of the main shell 10a, and welding the opening side 10d of the bottom shell to the lower end of the main shell 10a.

A discharge pipe 107 is provided, penetrating the top shell 10b, for discharging the high-pressure refrigerant compressed in the compression section 12 from inside the compressor body container 10 into the refrigeration cycle. The discharge pipe 107 is directly joined to the top shell 10b by brazing.

As shown in Figures 1 and 3, below the compressor body container 10, an accumulator container 25 is provided for separating the low-pressure refrigerant drawn in via the accumulator suction pipe 27 (described later) into gaseous and liquid refrigerants, and drawing only the gaseous refrigerant into the compression section 12. The accumulator container 25 has a cup-shaped accumulator shell 26, and the opening side 26a of the accumulator shell 26 is welded to the bottom shell 10c of the compressor body container 10. Therefore, the bottom shell 10c of the compressor body container 10 also serves as a lid that closes the opening side 26a of the accumulator shell 26. Although not shown, the cup-shaped accumulator shell 26 may have a cylindrical main shell and a dish-shaped bottom shell, and the outer circumference of the bottom shell may be joined to the lower end of the main shell.

The accumulator shell 26 is provided with an accumulator suction pipe 27 that draws refrigerant into the accumulator container 25, and a single refrigerant supply pipe 31 that sends gaseous refrigerant from inside the accumulator container 25 to the compression unit 12. The accumulator suction pipe 27 penetrates the side wall of the accumulator shell 26 and is joined to the accumulator shell 26 by welding. The refrigerant supply pipe 31 is located inside the accumulator shell 26 and connects to the compression unit 12 by penetrating from inside the accumulator shell 26 through the bottom 10e of the bottom shell 10c of the compressor body container 10. Details of the structure of the refrigerant supply pipe 31 will be described later.

As shown in Figure 1, a base member 310 supporting the entire rotary compressor 1 is fixed by welding to the lower part of the accumulator shell 26, that is, the side opposite the opening side 26a, i.e., the side 26b.

As shown in Figures 1 and 2, the compression section 12 comprises an upper cylinder 121T, a lower cylinder 121S, an intermediate partition plate 140, an upper end plate 160T, a lower end plate 160S, and a rotating shaft 15. The compression section 12 is constructed by stacking the upper end plate 160T, upper cylinder 121T, intermediate partition plate 140, lower cylinder 121S, and lower end plate 160S in that order, and is fixed by multiple bolts 175. Specifically, the intermediate partition plate 140 is positioned between the upper cylinder 121T and the lower cylinder 121S. The upper end plate 160T closes the upper end of the upper cylinder 121T. The lower end plate 160S closes the lower end of the lower cylinder 121S.

Furthermore, the upper end plate 160T is provided with a main bearing portion 161T. The lower end plate 160S is provided with a secondary bearing portion 161S. The rotating shaft 15 is provided with a main shaft portion 153, an upper eccentric portion 152T, a lower eccentric portion 152S, and a secondary shaft portion 151. The rotating shaft 15 is rotatably supported by fitting the main shaft portion 153 of the rotating shaft 15 into the main bearing portion 161T of the upper end plate 160T, and fitting the secondary shaft portion 151 of the rotating shaft 15 into the secondary bearing portion 161S of the lower end plate 160S.

The motor 11 has an externally positioned stator 111 and an internally positioned rotor 112. The stator 111 is fixed to the inner circumferential surface of the main shell 10a by shrink-fitting. The rotor 112 is fixed to the rotating shaft 15 by shrink-fitting.

The compressor body container 10 is filled with lubricating oil 18 in an amount sufficient to almost completely immerse the compression section 12, for the purpose of lubricating the sliding members of the compression section 12 and sealing the high-pressure and low-pressure sections within the compression chamber.

Next, the compression section 12 will be explained in detail using Figure 2. The upper cylinder 121T has a cylindrical upper hollow section 130T inside, and the upper piston 125T is positioned in the upper hollow section 130T. The upper piston 125T is fitted onto the upper eccentric section 152T of the rotating shaft 15. The lower cylinder 121S has a cylindrical lower hollow section 130S inside, and the lower piston 125S is positioned in the lower hollow section 130S. The lower piston 125S is fitted onto the lower eccentric section 152S of the rotating shaft 15.

The upper cylinder 121T has a groove extending from the upper hollow section 130T toward the outer circumference, and the upper vane 127T is positioned in the groove. The upper cylinder 121T has a protruding portion 122T from a part of its circular outer circumference. The upper cylinder 121T has an upper spring hole 124T that connects from the outer circumference of the protruding portion 122T to the groove, and the upper spring 126T is positioned in the upper spring hole 124T. The lower cylinder 121S has a groove extending from the lower hollow section 130S toward the outer circumference, and the lower vane 127S is positioned in the groove. The lower cylinder 121S has a protruding portion 122S from a part of its circular outer circumference. The lower cylinder 121S has a lower spring hole 124S that connects from the outer circumference of the protruding portion 122T to the groove, and the lower spring 126S is positioned in the lower spring hole 124S.

One end of the upper vane 127T is pressed against the upper piston 125T by the upper spring 126T, thereby dividing the space outside the upper piston 125T in the upper hollow portion 130T of the upper cylinder 121T into an upper suction chamber 131T and an upper discharge chamber 133T, which serve as upper compression chambers. The upper cylinder 121T has a refrigerant supply path 143 through which gaseous refrigerant is supplied to the upper suction chamber 131T via a refrigerant supply pipe 31. One end of the lower vane 127S is pressed against the lower piston 125S by the lower spring 126S, thereby dividing the space outside the lower piston 125S in the lower hollow portion 130S of the lower cylinder 121S into a lower suction chamber 131S and a lower discharge chamber 133S, which serve as lower compression chambers. The lower cylinder 121S has a refrigerant supply path 143 through which gaseous refrigerant is supplied to the lower suction chamber 131S via a refrigerant supply pipe 31. Details of the refrigerant supply path 143 formed in the upper cylinder 121T and the lower cylinder 121S will be described later.

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 discharge chamber 133T. An upper discharge valve 200T, which is a reed valve that opens and closes the upper discharge hole 190T, and an upper discharge valve retainer 201T that restricts the warping of the upper discharge valve 200T are fixed to the upper end plate 160T by upper rivets 202T. An upper end plate cover 170T is positioned above the upper end plate 160T, covering the upper discharge hole 190T, and an upper end plate cover chamber 180T is formed, which is closed by the upper end plate 160T and the upper end plate cover 170T. The upper end plate cover 170T is fixed to the upper end plate 160T by a plurality of bolts 175 that fix the upper end plate 160T and the upper cylinder 121T. The upper end plate cover 170T is provided with an upper end plate cover discharge hole 172 that connects the upper end plate cover chamber 180T to the inside of the compressor body container 10. Furthermore, when the compression section 12 is installed inside the compressor body container 10, the inner circumferential surface of the compressor body container 10 is shrink-fitted to the outer circumferential surface of the upper end plate 160T, and the upper end plate 160T is joined to the compressor body container 10 by welding.

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 discharge chamber 133S. A lower discharge valve 200S, which is a reed valve that opens and closes the lower discharge hole 190S, and a lower discharge valve retainer 201S that restricts the curvature of the lower discharge valve 200S are fixed to the lower end plate 160S by lower rivets 202S. A lower end plate cover 170S is positioned below the lower end plate 160S, covering the lower discharge hole 190S, and the lower end plate 160S and the lower end plate cover 170S form a lower end plate cover chamber 180S that is closed off (see Figure 1). The lower end plate cover 170S is fixed to the lower end plate 160S by a plurality of bolts 175 that fix the lower end plate 160S and the lower cylinder 121S. Furthermore, the lower end plate 160S is provided with a connecting passage 147 that forms a refrigerant supply path 143 for supplying gaseous refrigerant to the upper cylinder 121T and the lower cylinder 121S. The upper end portion 32a of the straight pipe section 32 of the refrigerant supply pipe 31 (described later) is connected to the connecting passage 147.

Furthermore, the compression section 12 is provided with a refrigerant passage hole 136 (see Figure 2) that penetrates the lower end plate 160S, lower cylinder 121S, intermediate partition plate 140, upper end plate 160T, and upper cylinder 121T, and connects the lower end plate cover chamber 180S and the upper end plate cover chamber 180T.

The following describes the flow of refrigerant due to the rotation of the rotating shaft 15. As the rotating shaft 15 rotates, the upper piston 125T, fitted into the upper eccentric portion 152T of the rotating shaft 15, and the lower piston 125S, fitted into the lower eccentric portion 152S, revolve, causing the upper intake chamber 131T and the lower intake chamber 131S to expand in volume and draw in refrigerant. As a refrigerant intake path, the low-pressure refrigerant of the refrigeration cycle is drawn into the accumulator container 25 through the accumulator intake pipe 27, and only gaseous refrigerant is drawn into the refrigerant supply pipe 31. The gaseous refrigerant drawn into the refrigerant supply pipe 31 is then drawn into the upper intake chamber 131T of the upper cylinder 121T and the lower intake chamber 131S of the lower cylinder 121S, respectively, via the refrigerant supply path 143, which will be described later.

Next, the flow of the discharged refrigerant due to the rotation of the rotating shaft 15 will be explained. As the rotating shaft 15 rotates, the upper piston 125T, fitted to the upper eccentric portion 152T of the rotating shaft 15, revolves, compressing the refrigerant while reducing the volume of the upper discharge chamber 133T. When the pressure of the compressed refrigerant becomes higher than the pressure in the upper end plate cover chamber 180T outside the upper discharge valve 200T, the upper discharge valve 200T opens, discharging the refrigerant from the upper discharge chamber 133T into the upper end plate cover chamber 180T. The refrigerant discharged into the upper end plate cover chamber 180T is then discharged into the compressor body container 10 through the upper end plate cover discharge hole 172 provided in the upper end plate cover 170T.

Furthermore, the rotation of the rotating shaft 15 causes the lower piston 125S, fitted into the lower eccentric portion 152S of the rotating shaft 15, to revolve, compressing the refrigerant while reducing the volume of the lower discharge chamber 133S. When the pressure of the compressed refrigerant becomes higher than the pressure in the lower end plate cover chamber 180S outside the lower discharge valve 200S, the lower discharge valve 200S opens, discharging the refrigerant from the lower discharge chamber 133S into the lower end plate cover chamber 180S. The refrigerant discharged into the lower end plate cover chamber 180S passes through the refrigerant passage hole 136 and the upper end plate cover chamber 180T, and is then discharged into the compressor body container 10 through the upper end plate cover discharge hole 172T provided in the upper end plate cover 170T.

The refrigerant discharged into the compressor body container 10 is guided upwards to the motor 11 through a notch (not shown) connecting the upper and lower parts of the stator 111, or a gap (not shown) in the winding section of the stator 111, or a gap 115 (see Figure 1) between the stator 111 and the rotor 112, and is discharged from the discharge pipe 107 located at the top of the compressor body container 10.

Next, the flow of the lubricating oil 18 will be explained. The lubricating oil 18 sealed in the lower part of the compressor body container 10 is supplied to the compression section 12 by the centrifugal force of the rotating shaft 15, passing through the inside of the rotating shaft 15 (not shown). The lubricating oil 18 supplied to the compression section 12 is drawn into the refrigerant, becomes atomized, and is discharged into the compressor body container 10 together with the refrigerant. The lubricating oil 18 discharged into the compressor body container 10 as atomization is separated from the refrigerant by centrifugal force due to the rotational force of the motor 11, and returns to the lower part of the compressor body container 10 as oil droplets. However, some of the lubricating oil 18 is not separated and is discharged into the refrigeration cycle together with the refrigerant. The lubricating oil 18 discharged into the refrigeration cycle circulates back to the accumulator container 25, where it is separated and remains at the bottom of the accumulator container 25. The lubricating oil 18 accumulated in the lower part of the accumulator container 25 is drawn in small amounts along with the gaseous refrigerant through the oil return hole 37 into the upper intake chamber 131T and the lower intake chamber 131S.

(Characteristic configuration of a rotary compressor)
Next, the characteristic configuration of the rotary compressor 1 of the embodiment will be described. The characteristics of the embodiment include a structure in which the refrigerant supply pipe 31 is connected to the compression section 12 by penetrating the bottom shell 10c of the compressor body container 10 from inside the accumulator shell 26, and a structure having a refrigerant supply path 143 that supplies gaseous refrigerant supplied from the refrigerant supply pipe 31 to the compression section 12.

Figure 3 is a longitudinal cross-sectional view showing an enlarged view of the main part of the embodiment. Figure 4 is a longitudinal cross-sectional view showing the connection structure of the refrigerant supply pipe 31 in the embodiment.

As shown in Figure 3, the refrigerant supply pipe 31 has a straight pipe section 32 that extends linearly along the vertical direction (axial direction of the rotation axis 15) of the compression section 12 from the bottom shell 10c to the compression section 12, and a curved pipe section 33 that is bent upward in a roughly U-shape from the lower end of the straight pipe section 32. The upper end 32a of the straight pipe section 32 of the refrigerant supply pipe 31 is connected to the connection passage 147 of the lower end plate 160S. The upper end of the curved pipe section 33 of the refrigerant supply pipe 31 opens into the interior of the accumulator shell 26. By positioning the upper end of the curved pipe section 33 of the refrigerant supply pipe 31 above the opening end of the accumulator suction pipe 27, it is prevented that liquid refrigerant flowing into the accumulator container 25 from the accumulator suction pipe 27 directly flows into the refrigerant supply pipe 31.

As shown in Figure 4, the connection passage 147 of the lower end plate 160S is provided with a sealing member 34 that seals the space between the inner circumference of the connection passage 147 and the outer circumference of the refrigerant supply pipe 31. For example, an O-ring made of resin or metal material can be used as the sealing member 34. The refrigerant supply pipe 31 is passed through a through hole 10f in the bottom 10e of the bottom shell 10c and is joined to the through hole 10f from the lower surface side of the bottom 10e of the bottom shell 10c, located inside the accumulator shell 26, by a welded joint W.

As shown in Figure 3, the compression section 12 has a refrigerant supply path 143 formed therein, which supplies gaseous refrigerant from the refrigerant supply pipe 31 to the upper suction chamber 131T of the upper cylinder 121T and the lower suction chamber 131S of the lower cylinder 121S. The refrigerant supply path 143 includes an upper compression section suction passage 144 formed in the upper cylinder 121T, a connecting passage 145 formed in the intermediate partition plate 140, a lower compression section suction passage 146 formed in the lower cylinder 121S, and a connecting passage 147 formed in the lower end plate 160S.

Furthermore, the refrigerant supply path 143 includes a straight path 143a formed along the vertical direction of the compression section 12, from the connection path 147 of the lower end plate 160S to the upper compression section intake path 144 of the upper cylinder 121T. This allows for a simpler formation of the refrigerant supply path 143, improving its machinability and enabling a reduction in the radial size of the compression section 12 containing the refrigerant supply path 143.

Figure 5A is a plan view of the upper cylinder 121T in the embodiment, viewed from above. Figure 5B is a plan view of the upper cylinder 121T in the embodiment, viewed from below. As shown in Figures 3 and 5A and 5B, the upper compression intake passage 144 of the upper cylinder 121T is formed as a groove opening to the lower end surface 121Tb of the upper cylinder 121T, which is in contact with the intermediate partition plate 140. The upper compression intake passage 144 has a first flow path 144a connected to the upper intake chamber 131T and a second flow path 144b connected to the communication passage 145 of the intermediate partition plate 140. The first flow path 144a extends radially along the upper cylinder 121T from the second flow path 144b to the inner circumferential surface of the upper cylinder 121T.

Figure 6A is a plan view of the lower cylinder 121S in the embodiment, viewed from above. Figure 6B is a plan view of the lower cylinder 121S in the embodiment, viewed from below. As shown in Figures 3 and 6A and 6B, the lower compression intake passage 146 of the lower cylinder 121S has a first flow path 146a connected to the lower intake chamber 131S and a second flow path 146b connected to the communication passage 145 of the intermediate partition plate 140.

The first passage 146a is formed as a groove opening into the upper end surface 121Sa of the lower cylinder 121TS, which is in contact with the intermediate partition plate 140. The first passage 146a extends radially along the lower cylinder 121S from the second passage 146b to the inner circumferential surface of the lower cylinder 121S. The second passage 146b is formed penetrating the lower cylinder 121S in the thickness direction (vertical direction of the compression section 12). The lower compression section suction passage 146 is formed by the first passage 146a branching from the second passage 146b to supply refrigerant to the lower suction chamber 131S and to supply refrigerant to the communication passage 145 of the intermediate partition plate 140.

In this way, by branching the lower compression section suction passage 146 into a first passage 146a and a second passage 146b, it becomes possible to supply gaseous refrigerant to both the upper compression section suction passage 144 and the lower compression section suction passage 146 using a single refrigerant supply pipe 31. A portion of the lower compression section suction passage 146 can be shared as a common path for supplying gaseous refrigerant to both the upper suction chamber 131T and the lower suction chamber 131S. As a result, the refrigerant supply path 143 can be simplified, and the compression section 12 having the refrigerant supply path 143 can be miniaturized.

Figure 7 is a plan view of the intermediate partition plate 140 in the embodiment, viewed from above. As shown in Figure 3, the intermediate partition plate 140 has an upper end surface 140a that contacts the upper cylinder 121T and a lower end surface 140b that contacts the lower cylinder 121S. As shown in Figures 3 and 7, the intermediate partition plate 140 has a protruding portion 141 that extends from a part of its circular outer circumference, and a connecting passage 145 is formed in the thickness direction of the intermediate partition plate 140, penetrating through the protruding portion 141.

The upper end surface 140a of the intermediate partition plate 140 contacts the upper cylinder 121T, forming the lower flow path wall of the first flow path 144a in the upper compression intake passage 144. Similarly, the lower end surface 140b of the intermediate partition plate 140 contacts the upper cylinder 121T, forming the lower flow path wall of the first flow path 144a in the upper compression intake passage 144.

Figure 8 is a plan view of the lower end plate 160S in the embodiment, viewed from below. As shown in Figures 3 and 8, a portion of the circular outer circumference has an overhang 162 extending from this outer circumference, and a connecting passage 147 is formed in the overhang 162, penetrating through the thickness direction of the lower end plate 160S.

Figure 9 is a plan view of the lower end plate cover 170S in the embodiment, viewed from below. As shown in Figures 3 and 9, an arc-shaped notch 171 is formed on the outer circumference of the lower end plate cover 170S to avoid collision with the refrigerant supply pipe 31 connected to the lower end plate 160S. Therefore, when the refrigerant supply pipe 31 is connected to the compression section 12, the refrigerant supply pipe 31 passes through the notch 171 and connects to the connection path 147 of the lower end plate 160S.

As described above, the upper compression section suction passage 144, connecting passage 145, lower compression section suction passage 146, and connecting passage 147 (hereinafter referred to as each passage) that form the refrigerant supply path 143 are formed in the respective protruding sections 122T, 141, 122S, and 162. This ensures adequate mechanical strength in the areas where each passage is formed, making it possible to create a larger flow path cross-sectional area for each passage. As a result, the flow resistance of the gaseous refrigerant flowing through the refrigerant supply path 143 is reduced, and the compression efficiency of the gaseous refrigerant is increased.

Furthermore, in the above-described embodiment, as shown in Figure 4, the connection portion between the upper end 32a of the refrigerant supply pipe 31 and the connecting passage 147 was sealed using a sealing member 34. However, the structure is not limited to the use of a sealing member 34. Figure 10 is a longitudinal cross-sectional view showing another example of the connection structure of the refrigerant supply pipe 31 in the embodiment.

As shown in Figure 10, the upper end portion 32a of the refrigerant supply pipe 31 is formed in a tapered shape with a gradually decreasing outer diameter. The connecting passage 147 of the lower end plate 160S is formed in a tapered shape with a gradually decreasing inner diameter. The upper end portion 32a of the refrigerant supply pipe 31 is connected by press-fitting it into the connecting passage 147. By press-fitting the refrigerant supply pipe 31 into the connecting passage 147 in this way, the space between the inner circumference of the connecting passage 147 and the outer circumference of the refrigerant supply pipe 31 is sealed, thus eliminating the need to use a sealing member 34 or to machine a groove for fixing the sealing member 34 on the inner surface of the connecting passage 147.

(Method of manufacturing a rotary compressor)
In the manufacturing method of the rotary compressor 1 configured as described above, the step of assembling the refrigerant supply pipe 31 inside the accumulator shell 26 will be explained. Figure 11 is a longitudinal cross-sectional view illustrating the manufacturing method of the rotary compressor 1 of the embodiment. Figure 12 is a longitudinal cross-sectional view illustrating another example of the manufacturing method of the rotary compressor 1 of the embodiment.

As shown in Figure 11, the motor 11 and compression unit 12 are assembled inside the main shell 10a. The upper end 32a of the refrigerant supply pipe 31, which is joined through the bottom 10e of the bottom shell 10c, is connected to the connection passage 147 of the compression unit 12. The opening side 10d of the bottom shell 10c is then joined to the main shell 10a to manufacture the intermediate body. Next, the opening side 26a of the accumulator shell 26 is welded to the bottom shell 10c, which has the refrigerant supply pipe 31 connected to the compression unit 12 through it and is joined to the main shell 10a. The accumulator suction pipe 27 may be assembled after the accumulator shell 26 is joined to the bottom shell 10c.

Alternatively, as shown in Figure 12, an intermediate body is manufactured by welding the open side 26a of the accumulator shell 26 to a bottom shell 10c, which has a refrigerant supply pipe 31 joined to it through its bottom 10e. Another intermediate body is manufactured by assembling the motor 11 and compression unit 12 inside the main shell 10a. Then, the upper end 32a of the refrigerant supply pipe 31, which is provided through the bottom shell 10c to which the accumulator shell 26 is joined, is connected to the connection passage 147 of the compression unit 12, and the open side 10d of the bottom shell 10c is welded to the main shell 10a.

(Effects of the example)
As described above, in the rotary compressor 1 of the embodiment, a single refrigerant supply pipe 31 is provided inside the accumulator shell 26 to supply gaseous refrigerant from the accumulator shell 26 to the compression section 12. The refrigerant supply pipe 31 is connected to the compression section 12 by passing through the bottom shell 10c of the compressor body container 10 from inside the accumulator shell 26. In the compression section 12, a refrigerant supply path 143 is formed to supply gaseous refrigerant from the refrigerant supply pipe 31 to the upper suction chamber 131T of the upper cylinder 121T and the lower suction chamber 131S of the lower cylinder 121S, respectively, and the refrigerant supply pipe 31 is connected to the refrigerant supply path 143. In this way, gaseous refrigerant is supplied from inside the accumulator shell 26 through the refrigerant supply pipe 31 to the compression section 12 from inside the compressor body container 10, so that the refrigerant supply pipe 31 is not located outside the compressor body container 10, and thus the compressor body container 10 can be made smaller in the radial direction.

Furthermore, in the rotary compressor 1 of this embodiment, the lower compression intake passage 146 of the lower cylinder 121S in the compression section 12 branches into a first flow path 146a connected to the lower intake chamber 131S and a second flow path 146b connected to the communication passage 145 of the intermediate partition plate 140. This makes it possible to supply gaseous refrigerant to both the upper compression intake passage 144 and the lower compression intake passage 146 using a single refrigerant supply pipe 31, and a portion of the lower compression intake passage 146 can be shared as a common path for supplying gaseous refrigerant to both the upper intake chamber 131T and the lower intake chamber 131S. As a result, the refrigerant supply path 143 is simplified, and the compression section 12 having the refrigerant supply path 143 can be miniaturized.

Furthermore, the refrigerant supply path 143 in the compression section 12 of the rotary compressor 1 in this embodiment includes a straight path 143a formed along the vertical direction of the compression section 12, from the connecting path 147 of the lower end plate 160S to the upper compression section suction path 144 of the upper cylinder 121T. By including a straight path 143a in the refrigerant supply path 143 in this way, the simplification of the refrigerant supply path 143 is simplified, the processability of the refrigerant supply path 143 is improved, and the compression section 12 having the refrigerant supply path 143 can be miniaturized.

Furthermore, in the rotary compressor 1 of this embodiment, the refrigerant supply pipe 31 extends linearly from the bottom shell 10c to the compression section 12, along the vertical direction of the compression section 12. This facilitates the routing of the refrigerant supply pipe 31 within the compressor body container 10 and improves the ease of connecting the refrigerant supply pipe 31 to the compression section 12.

Furthermore, at least a portion of the refrigerant supply path 143 in the compression section 12 of the rotary compressor 1 in this embodiment is formed on the protruding portion 122T of the upper cylinder 121T, the protruding portion 141 of the intermediate partition plate 140, the protruding portion 122S of the lower cylinder 121S, and the protruding portion 162 of the lower end plate 160S. This ensures that the mechanical strength of each section of the refrigerant supply path 143 is adequately maintained, making it possible to create a larger flow path cross-sectional area for each path. This reduces the flow resistance of the refrigerant supply path 143 and improves the compression efficiency of the gaseous refrigerant.

1. Rotary compressor (closed-type compressor)
10 Compressor body container 10a Main shell 10c Bottom shell 11 Motor 12 Compression section 25 Accumulator container 26 Accumulator shell 26a Opening side 31 Refrigerant supply pipe 32a Upper end (one end)
34 Sealing member 121T Upper cylinder 121S Lower cylinder 122T Protruding part (Protruding part)
122S Overhang (Overhang)
131T Upper intake chamber (upper compression chamber)
131S Lower intake chamber (lower compression chamber)
140 Intermediate partition plate (partition plate)
140a Upper end surface (end surface)
140b Lower end surface (end surface)
141 Protruding section 143 Refrigerant supply path 143a Straight path 144 Upper compression section intake path 145 Connecting passage 146 Lower compression section intake path 146a First flow path 146b Second flow path 147 Connecting passage 160S Lower end plate 170S Lower end plate cover

Claims (7)

A compression unit having an upper cylinder and a lower cylinder that compress the inhaled gaseous refrigerant and discharge it into the compressor unit is housed inside a vertical cylindrical compressor body container, and a motor that drives the compression unit is also housed inside.
A sealed compressor is provided with an accumulator container located below the compressor body container, which separates the inhaled refrigerant into gaseous and liquid refrigerants and supplies the gaseous refrigerant to the compression section.
The compressor body container comprises a cylindrical main shell and a bottom shell joined to the lower end of the main shell.
The accumulator container comprises a cup-shaped accumulator shell and an accumulator suction pipe for drawing refrigerant into the accumulator shell , with the opening side of the accumulator shell joined to the compressor body container.
The accumulator suction tube penetrates the accumulator shell and extends its end into the interior of the accumulator shell.
A single refrigerant supply pipe is provided inside the accumulator shell to supply gaseous refrigerant from the accumulator shell to the compression section.
The refrigerant supply pipe is connected to the compression section by passing through the bottom shell of the compressor body container from inside the accumulator shell,
The compression section is provided with a refrigerant supply path that supplies gaseous refrigerant from the refrigerant supply pipe to the upper compression chamber of the upper cylinder and the lower compression chamber of the lower cylinder, respectively.
The refrigerant supply path is connected to the refrigerant supply pipe .
Within the accumulator shell, the refrigerant supply pipe has a straight pipe section extending linearly in the vertical direction of the compression section, and a curved pipe section that is curved upward from the lower end of the straight pipe section.
A sealed compressor in which the upper end of the curved pipe section is located above the end of the accumulator suction pipe . The refrigerant supply pipe has an oil return hole for returning the lubricating oil that accumulates in the lower part of the accumulator container to the compression section together with the refrigerant.
A sealed compressor according to claim 1. The compression section includes a partition plate positioned between the upper cylinder and the lower cylinder, and a lower end plate that closes the lower end of the lower cylinder.
The refrigerant supply path includes an upper compression intake passage formed in the upper cylinder, a connecting passage formed in the partition plate, a lower compression intake passage formed in the lower cylinder, and a connecting passage formed in the lower end plate.
The refrigerant supply pipe is connected to the connection path.
A sealed compressor according to claim 1 or 2 . The intake passage of the lower compression section of the lower cylinder branches into a first passage connected to the lower compression chamber and a second passage connected to the communication passage of the partition plate.
The sealed compressor according to claim 3 . The refrigerant supply path includes a straight path formed along the vertical direction of the compression section from the connection passage of the lower end plate to the upper compression section intake passage of the upper cylinder.
A sealed compressor according to claim 3 or 4 . The upper cylinder, the partition plate, and the lower cylinder each have a protruding portion that extends from a part of their outer circumference.
At least a portion of the refrigerant supply path is formed in the protruding portion,
A sealed compressor according to any one of claims 3 to 5. The end face of the partition plate forms a part of at least one of the upper compression intake passage and the lower compression intake passage.
A sealed compressor according to any one of claims 3 to 6.