JP2013100779A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor that can prevent a working fluid in an intake path from being heated by heat from an oil pool without increasing the pressure loss of the working fluid in the intake path.SOLUTION: The hermetic compressor 100A includes a compression mechanism 8, and a pressure container 6 for housing the compression mechanism 8. The compression mechanism 8 is immersed in the oil pool 12 formed at the bottom of the pressure container 6. An intake port 8a of the compression mechanism 8 and an intake tube (3 or 4) connected thereto forms an intake path (21 or 22). The pressure container 6 is provided therein with a retention chamber (3a or 4a) slightly communicating with the oil pool 12, and for retaining oil at least at a part of the periphery of the intake path in the oil pool 12.

Description

  The present invention relates to a hermetic compressor.

  Conventionally, a hermetic compressor in which a compression mechanism is housed in a pressure vessel is known. For example, Patent Document 1 discloses a hermetic compressor 501 as shown in FIG. The hermetic compressor 501 includes a pressure vessel 503, an electric motor 504 disposed in the upper portion of the pressure vessel 503, and a rotary compression mechanism 505 disposed in the lower portion of the pressure vessel 503. An oil reservoir 502 into which the compression mechanism 505 is immersed is formed at the bottom of the pressure vessel 503, and the internal space above the oil reservoir 502 is filled with the working fluid discharged from the compression mechanism 505.

  The compression mechanism 505 includes a cylinder 506 and a roller 508 that is turned by the eccentric portion 507a of the rotation shaft 507 in the cylinder 506. A lower closing member 513 and an upper closing member 514 that close the working chamber formed between the cylinder 506 and the roller 508 are disposed below and above the compression mechanism 505. The cylinder 506 is provided with a suction port 512, and the upper closing member 514 is provided with a discharge port 516. A suction pipe 509 is connected to the suction port 512 through the pressure vessel 503.

  As shown in FIG. 12B, the suction pipe 509 has an enlarged portion 511 that is enlarged in the oil reservoir 502. Further, the inner wall surface 509 a of the suction pipe 509 is covered with a heat insulating material 510. Since the suction pipe 509 is immersed in an oil reservoir 502 made of high-temperature oil, when the inner wall surface 509 a of the suction pipe 509 is exposed, the working fluid flowing through the suction pipe 509 is removed from the surrounding oil reservoir 502. Upon receiving heat, the volume of the working fluid expands. As a result, there arises a problem that the amount of working fluid sucked by the compression mechanism 505 is reduced. On the other hand, if the inner wall surface 509a of the suction pipe 509 is covered with the heat insulating material 510, heating from the oil reservoir 502 to the working fluid flowing through the suction pipe 509 can be suppressed. Thereby, the improvement of the refrigerating capacity of the refrigerating-cycle apparatus using the hermetic compressor 501 is achieved.

JP-A-4-353276

  However, in the conventional configuration, since the heat insulating material is installed on the inner wall surface of the suction pipe through which the working fluid flows, the pressure loss of the working fluid increases, and the pressure of the working fluid sucked by the compression mechanism decreases. This increases the input required by the compression mechanism to increase the pressure to the required pressure, and as a result, the performance as a hermetic compressor may be reduced. On the other hand, if the thickness of the heat insulating material on the inner wall surface of the suction pipe is limited so that the pressure loss of the working fluid does not increase, the heat insulating effect has to be limited.

  In view of such circumstances, the present invention provides a hermetic compressor capable of suppressing the heating from the oil reservoir to the working fluid flowing through the suction path without increasing the pressure loss of the working fluid in the suction path. For the purpose.

  In order to solve the above-described problems, a hermetic compressor according to the present invention includes a compression mechanism that compresses a working fluid sucked from a suction port and discharges the fluid from the discharge port, and the compression mechanism. A pressure vessel in which an oil reservoir to be immersed is formed and a space above the oil reservoir is filled with a working fluid discharged from the compression mechanism, and penetrates the pressure vessel below the oil surface of the oil reservoir, Retention that is slightly in communication with the oil reservoir, and that causes the oil to stay in at least part of the periphery of the suction path constituted by the suction tube and the suction port in the oil reservoir and the suction pipe connected to the suction port And a chamber.

  Here, “slightly communicate” means that they communicate to such an extent that the oil flow between the oil reservoir and the retention chamber is substantially prohibited.

  According to the above configuration, the retention chamber retains oil in at least a part of the periphery of the suction path constituted by the suction pipe and the suction port. Since the retention chamber only communicates slightly with the oil reservoir, there is almost no oil flow in the retention chamber. Since the thermal conductivity of oil is low and is equivalent to a resin material used for a heat insulating material or the like, a heat insulating layer made of oil can be formed in at least a part of the periphery of the suction path by the staying chamber. Thereby, the heating from the oil reservoir to the working fluid flowing through the suction path can be suppressed without increasing the pressure loss of the working fluid in the suction path. As a result, it is possible to improve the refrigeration capacity of the refrigeration cycle apparatus using the hermetic compressor.

1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment of the present invention. (A) is a cross-sectional view taken along line IIA-IIA in FIG. 1, and (b) is a cross-sectional view taken along line IIB-IIB in FIG. Side surface sectional drawing which shows the residence chamber in 1st Embodiment Oil temperature distribution near the stay chamber in the first embodiment The longitudinal cross-sectional view of the hermetic compressor of the modification of 1st Embodiment (A) is a cross-sectional view taken along the line VIA-VIA in FIG. 5, and (b) is a cross-sectional view taken along the line VIB-VIB in FIG. A longitudinal sectional view of a hermetic compressor according to a second embodiment of the present invention. (A) is a cross-sectional view taken along line VIIIA-VIIIA in FIG. 7, and (b) is a cross-sectional view taken along line VIIIB-VIIIB in FIG. The side view which shows the residence chamber in 2nd Embodiment Oil temperature distribution diagram in the vicinity of the retention chamber in the second embodiment Longitudinal sectional view of a hermetic compressor of a modification of the second embodiment (A) is a longitudinal sectional view of a conventional hermetic compressor, and (b) is a detailed view of a suction pipe of the hermetic compressor.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the present invention is not limited to the following embodiments.

(First embodiment)
FIG. 1 is a longitudinal sectional view of a hermetic compressor 100A according to a first embodiment of the present invention. The hermetic compressor 100A includes a compressor body 1, an accumulator 2, two suction pipes 3, 4 and a discharge pipe 5.

  The compressor body 1 includes a pressure vessel 6, a motor 7, a pair of compression mechanisms 8, and a shaft 10. The pair of compression mechanisms 8 are disposed in the lower part in the pressure vessel 6. The pair of compression mechanisms 8 are sandwiched between the upper closing member 18 and the lower closing member 24, and an intermediate plate 19 is disposed between the pair of compression mechanisms 8. The motor 7 is disposed above the upper closing member 18 in the pressure vessel 6. The shaft 10 extends in the vertical direction and connects the pair of compression mechanisms 8 and the motor 7. A terminal 11 for supplying electric power to the motor 7 is provided on the upper portion of the pressure vessel 6.

  The motor 7 includes a stator 7a and a rotor 7b. The stator 7 a is fixed to the inner peripheral surface of the pressure vessel 6. The rotor 7 b is fixed to the shaft 10 and rotates together with the shaft 10. An oil supply passage 10d is provided at the center of the shaft 10, and an oil supply mechanism 10c is provided at the lower end portion of the shaft 10 for pumping oil in an oil reservoir 12 (to be described later) into the oil supply passage 10d.

  Each compression mechanism 8 compresses the working fluid sucked from the suction port 8a and discharges it from the discharge port 8b. An oil reservoir 12 is formed in the pressure vessel 6 by holding oil (lubricating oil) at the bottom. The pair of compression mechanisms 8 are immersed in the oil reservoir 12. The internal space 13 above the oil reservoir 12 of the pressure vessel 6 is filled with the working fluid discharged from the compression mechanism 8.

  The discharge pipe 5 passes through the upper part of the pressure vessel 6 and opens into the internal space 13 of the pressure vessel 6. The discharge pipe 5 plays a role of guiding a compressed working fluid (typically a refrigerant) to the outside of the compressor body 1. The suction pipes 3 and 4 extend from the accumulator 2 to the compression mechanism 8 and pass through the trunk of the pressure vessel 6 below the oil surface of the oil reservoir 12. The suction pipes 3 and 4 play a role of guiding the working fluid to be compressed from the accumulator 2 to the suction port 8 a of the compression mechanism 8. Note that one of the suction pipes 3 and 4 may be branched from the other inside or outside the accumulator 2.

  The accumulator 2 includes a storage container 2a and an introduction pipe 2b. The accumulation container 2a has an internal space that can hold a liquid-phase working fluid and a gas-phase working fluid. The introduction pipe 2b passes through the upper part of the storage container 2a and opens into the internal space of the storage container 2a. The suction pipes 3 and 4 are connected to the accumulator 2 so as to penetrate the bottom of the storage container 2a. The suction pipes 3 and 4 extend upward from the bottom of the storage container 2a, and the upstream ends of the suction pipes 3 and 4 open to the internal space of the storage container 2a at a certain height position. It should be noted that another member such as a baffle may be provided inside the storage container 2a in order to reliably prevent the liquid-phase working fluid from proceeding directly from the introduction pipe 2b to the suction pipes 3 and 4.

  Each of the compression mechanisms 8 arranged vertically is a rotary (positive displacement) fluid mechanism, and is moved by the motor 7 to suck in the working fluid from the suction port 8a and compress the working fluid to discharge the discharge port 8b. Discharge from. The pair of compression mechanisms 8 have the same configuration.

  FIGS. 2A and 2B are cross-sectional views of the compressor body 1 in the first embodiment. As shown in FIGS. 2A and 2B, each compression mechanism 8 includes a cylinder 14, a piston 15, a vane 16, and a spring 17. The shaft 10 is provided with a first eccentric portion 10a and a second eccentric portion 10b. The eccentric direction of the first eccentric portion 10a is shifted by 180 degrees from the eccentric direction of the second eccentric portion 10b. That is, the compression mechanism 8 positioned below (hereinafter also referred to as “upper compression mechanism 8”) is also referred to as the compression mechanism 8 (hereinafter referred to as “lower compression mechanism 8”) in which the phase of the piston 15 is positioned below. ) And the rotation angle of the shaft 10 are shifted by 180 degrees.

  The cylinder 14 is fitted into the first eccentric portion 10a or the second eccentric portion 10b of the shaft 10 so that a working chamber 25 is formed between the outer peripheral surface of the cylinder 14 and the inner peripheral surface of the cylinder 14. A piston 15 is arranged. A vane groove 26 is formed in the cylinder 14. The vane groove 26 accommodates the vane 16 having a tip that contacts the outer peripheral surface of the piston 15. The spring 17 is disposed in the holding hole 20 and the vane groove 26 that open from the outer end of the vane groove 26 to the end face of the cylinder 14 so as to push the vane 16 toward the piston 15. The working chamber 25 between the cylinder 14 and the piston 15 is partitioned by the vane 16, thereby forming a suction chamber 25a and a compression-discharge chamber 25b. The vane 16 may be integrated with the piston 15. That is, the piston 15 and the vane 16 may be constituted by a so-called swing piston.

  In the present embodiment, the cylinder 14 is provided with a suction port 8a through which the working fluid to be compressed flows into the suction chamber 25a (that is, opens to the suction chamber 25a). The downstream end of the suction pipe 3 or the suction pipe 4 is connected to the suction port 8a. In other words, the suction ports 8 a and the suction pipes 3 and 4 constitute suction paths 21 and 22 that guide the working fluid from the outside of the pressure vessel 6 to the working chamber 25. The suction paths 21 and 22 are also lined up and down.

  The vane 16 of the lower compression mechanism 8 is disposed at a position that coincides with the vane 16 of the upper compression mechanism 8 in the axial direction of the shaft 10. For this reason, the timing at which the piston 15 of the lower compression mechanism 8 is located at the top dead center (the position at which the vane 16 is most retracted) is shifted by 180 degrees from the timing at which the piston 15 of the upper compression mechanism 8 is located at the top dead center. ing.

  The upper closing member 18 and the intermediate plate 19 close the working chamber 25 of the compression mechanism 8 positioned upward from both axial sides of the shaft 10. The intermediate plate 19 and the lower closing member 24 close the working chamber 25 of the compression mechanism 8 positioned downward from both axial sides of the shaft 10. The upper closing member 18 and the lower closing member 24 also function as bearings that rotatably support the shaft 10.

  The peripheral edge of the upper closing member 18 is fixed to the inner peripheral surface of the pressure vessel 6, but the intermediate plate 19 and the lower closing member 24 have a diameter that does not close the outer end of the vane groove 26. . Therefore, the end of the upper compression mechanism 8 opposite to the piston 15 of the vane 16 and the end of the lower compression mechanism 8 opposite to the piston 15 of the vane 16 are oiled through the outer end of the vane groove 26. It is exposed to the reservoir 12.

  In the present embodiment, the upper closing member 18 and the lower closing member 24 are provided with a discharge port 8b through which the compressed working fluid flows out from the compression-discharge chamber 25b (that is, opens to the compression-discharge chamber 25b). That is, when viewed from the center of the upper compression mechanism 8, the upper closing member 18 corresponds to the first closing member of the present invention, and the intermediate plate 19 corresponds to the second closing member of the present invention. Similarly, when viewed from the lower compression mechanism 8, the lower closing member 24 corresponds to the first closing member of the present invention, and the intermediate plate 19 corresponds to the second closing member of the present invention.

  As shown in FIG. 1, the upper closing member 18 has a recess 18 a that is recessed from the upper surface of the upper closing member 18 in the vicinity of the vane 16, and the discharge port 8 b of the upper compression mechanism 8 serves as the upper closing member. 18 extends from the bottom surface of the recess 18 to the bottom surface of the recess 18a. Further, a discharge valve 29 that opens and closes the discharge port 8b by elastic deformation and a stopper 30 that regulates the deformation amount of the discharge valve 29 are disposed in the recess 18a. An upper muffler 33 that covers the discharge port 8b together with a space facing the upper closing member 18 is disposed above the upper closing member 18. The discharge port 8 b communicates with the internal space 13 of the pressure vessel 6 through a space covered with the upper muffler 33. Note that the oil surface of the oil reservoir 12 is at an intermediate height position of the upper muffler 33.

  Similarly, the lower closing member 24 is formed with a recess 24 a that is recessed from the lower surface of the lower closing member 24 in the vicinity of the vane 16, and the discharge port 8 b of the lower compression mechanism 8 is the upper surface of the lower closing member 24. To the bottom of the recess 24a. Further, a discharge valve 31 that opens and closes the discharge port 8b by elastic deformation and a stopper 32 that regulates the deformation amount of the discharge valve 31 are disposed in the recess 24a. A lower muffler 34 that covers the discharge port 8 b together with a space facing the lower closing member 24 is disposed below the lower closing member 24. The space covered by the lower muffler 34 communicates with the space covered by the upper muffler 33 by the communication passage 9 extending from the lower surface of the lower closing member 24 to the upper surface of the upper closing member 18. That is, the discharge port 8 b communicates with the internal space 13 of the pressure vessel 6 through a space covered with the lower muffler 34, a space covered with the communication path 9 and the upper muffler 33.

  Further, in the pressure vessel 6, retention chambers 3 a and 4 a for retaining oil in at least a part of the periphery of each of the suction paths 21 and 22 in the oil reservoir 12 are provided.

  FIG. 3 is a cross-sectional side view showing the staying chambers 3a and 4a in the first embodiment. In the present embodiment, each of the retention chambers 3a and 4a is surrounded by a partition member (211 or 212) disposed between the cylinder 14 and the pressure vessel 6. That is, each of the retention chambers 3a and 4a is an annular chamber surrounding the suction pipe (3 or 4). The partition members 211 and 212 are arranged so as to form the retention chambers 3a and 4a for each of the suction paths 21 and 22.

  As shown in FIGS. 1 and 2 (a) and 2 (b), a minute gap is formed between the end faces of the partition members 211 and 212 and the inner peripheral surface of the pressure vessel 6, and stays through this gap. The chambers 3a and 4a are in slight communication with the oil reservoir 12. For this reason, the same oil as the oil reservoir 12 is held in the retention chambers 3a and 4a.

  The partition member 211 surrounding the stay chamber 3a surrounding the upper suction pipe 3 is divided into an upper piece 201 and an intermediate piece 202 which are a plurality of pieces (two in the illustrated example), and surrounds the lower suction pipe 4. The partition member 212 surrounding the staying chamber 4a is divided into a lower piece 203 and an intermediate piece 202 which are a plurality of pieces (two in the illustrated example). That is, the intermediate piece 202 constitutes both partition members 211 and 212.

  The upper piece 201 and the lower piece 203 have a groove shape in which side walls facing each other are connected by a main wall, and the intermediate piece 202 has a thick plate shape. Each of the main wall of the upper piece 201 and the lower piece 203 and the intermediate piece 202 is provided with a plurality of gaps (201a, 202a or 203a) that open to the end faces of the partition members 211 and 212. In the present embodiment, the gaps 201a, 202a and 203a are arranged in a plurality of stages in two rows. The same oil as the oil reservoir 12 is held in the gaps 201a, 202a and 203a. In the present embodiment, the upper piece 201, the intermediate piece 202, and the lower piece 203 are made of a resin material.

  In the present embodiment, the shaft 10 rotates to compress the working fluid in the compression mechanism 8. As the shaft 10 rotates, a flow is generated in the oil reservoir 12 at the bottom of the pressure vessel 6. When the shaft 10 rotates, the oil in the oil reservoir 12 is transported upward through the oil supply passage 10d by the oil supply mechanism 10c, and further downward from the lateral holes provided in the first eccentric portion 10a and the second eccentric portion 10b of the shaft 10. To the compression mechanism 8 and the upper compression mechanism 8. The oil supplied to the upper compression mechanism 8 lubricates the compression mechanism 8, then flows to the bearing portion 18b of the upper closing member 18, flows out from above the bearing portion 18b to the lower space of the rotor 7b, and accumulates oil. Return to 12. The oil supplied to the lower compression mechanism 8 lubricates the compression mechanism 8 and then flows to the bearing portion 24b of the lower closing member 24 and returns to the oil reservoir 12 from below the bearing portion 24b. The oil supplied to both the compression mechanisms 8 and returning to the oil reservoir 12 again receives heat from the high-temperature working fluid in the compression mechanism 8 and becomes high temperature.

  However, since the interior of the retention chamber 3a surrounding the upper suction pipe 3 and the interior of the retention chamber 4a surrounding the lower suction pipe 4 are substantially isolated from the oil reservoir 12, high-temperature oil from the oil reservoir 12 is obtained. The oil in the staying chambers 3 a and 4 a stays without being affected by the flow of the oil reservoir 12.

  The thermal conductivity of the oil is low and is equivalent to a resin material used for a heat insulating material or the like, and the oil in the staying chambers 3a and 4a acts as a heat insulating layer around the upper suction pipe 3 and the lower suction pipe 4. To do.

  FIG. 4 is an oil temperature distribution diagram in the vicinity of the upper residence chamber 3a in the first embodiment, and shows a temperature distribution on the axis X extending in the horizontal direction from the center of the suction pipe 3. This temperature distribution is the same in the vicinity of the lower residence chamber 4a.

  As shown in FIG. 4, temperature stratification occurs in the oil in the upper retention chamber 3a, and the temperature in the vicinity of the suction pipe 3 (position A in the figure) becomes the temperature of the oil reservoir 12 (position B in the figure). Compared to the low temperature. As a result, heat reception from the oil reservoir 12 of the working fluid flowing through the suction pipe 3 is suppressed. Similarly, temperature stratification occurs in the oil in the lower retention chamber 4 a, and the vicinity of the suction pipe 4 becomes lower than the temperature of the oil reservoir 12. As a result, heat reception from the oil reservoir 12 of the working fluid flowing through the suction pipe 4 is suppressed. As a result, the refrigeration capacity of the refrigeration cycle apparatus using the hermetic compressor 100A is improved.

  In the present embodiment, the vanes 16 of the compression mechanisms 8 are exposed to the oil reservoir 12, but the oil in the stay chambers 3 a and 4 a is affected by the oil flow caused by the behavior of the vanes 16 in the vane grooves 26. I do not receive it. As a result, since the temperature stratification is stabilized, the heat receiving from the oil reservoir 12 of the working fluid flowing through the suction pipes 3 and 4 is suppressed, and the refrigerating capacity is improved.

  By the way, the thickness of the heat insulating material in the prior art as shown in FIG. On the other hand, in this embodiment, since the retention chambers 3a and 4a for retaining oil in the pressure vessel 6 are provided, the degree of freedom in design is increased, and the oil retention layer can be configured with a thickness of about 10 mm or more. The heat insulation effect can also be enhanced than before.

  Furthermore, in this embodiment, since the partition members 211 and 212 surrounding the stay chambers 3a and 4a are made of a resin material, heat transfer between the oil reservoir 12 and the oil in the stay chambers 3a and 4a can be suppressed. Further, the heat receiving from the oil reservoir 12 of the working fluid flowing through the suction pipes 3 and 4 can be further suppressed, and the refrigeration capacity can be further improved.

  In the present embodiment, the gaps 201a, 202a, 203a are provided in the pieces 201, 202, 203 constituting the partition members 211, 212, and most of the oil stays inside the gaps 201a, 202a, 203a. It does not flow. Thereby, the flow of oil in the retention chambers 3a and 4a can be suppressed, temperature stratification can be further stabilized, and the heat receiving from the oil reservoir 12 of the working fluid flowing through the suction pipes 3 and 4 can be further suppressed.

<Modification>
FIG. 5 is a longitudinal sectional view of a hermetic compressor 100B according to a modification of the first embodiment. 6 (a) and 6 (b) are cross-sectional views of the compressor body 1 in a modified example.

  In the embodiment, the staying chambers 3a and 4a are surrounded by the partition members 211 and 212. However, the staying chambers 3a and 4a are not necessarily surrounded by the partitioning members. For example, as shown in FIG. 5 and FIGS. 6A and 6B, the staying chambers 3 a and 4 a may be enclosed by using a protrusion for forming the vane groove 26 of the cylinder 14. Specifically, the intermediate plate 19 and the lower closing member 24 are provided with overhang portions 241 and 242 that project to the vicinity of the inner peripheral surface of the pressure vessel 6 in the vicinity of the suction pipes 3 and 4. Further, plate-like partition members 251 and 252 are stood at the end portions of the projecting portions 241 and 242 opposite to the protruding portion of the cylinder 14. Even with such a configuration, it is possible to obtain the same effects as those of the above-described embodiment.

(Second Embodiment)
FIG. 7 is a longitudinal sectional view of a hermetic compressor 100C according to the second embodiment of the present invention. FIGS. 8A and 8B are cross-sectional views of the compressor body 1 in the second embodiment. FIG. 9 is a side view showing the staying chambers 3a and 4a in the second embodiment. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, the cylinder 14 of each compression mechanism 8 is close to the inner peripheral surface of the pressure vessel 6 over the entire circumference. The cylinder 14 of the upper compression mechanism 8 is provided with a first through hole 301 that penetrates the cylinder 14 on the side opposite to the vane 16 with respect to the suction path 21, and between the suction path 21 and the vane 16. Two through holes 311 are provided. Similarly, the cylinder 14 of the lower compression mechanism 8 is provided with a first through hole 302 that penetrates the cylinder 14 on the side opposite to the vane 16 with respect to the suction path 22, and the suction path 22 and the vane 16. A second through hole 312 is provided between the two. Further, the intermediate plate 19 is provided with a lateral hole 303 that extends from the first through holes 301 and 302 beyond the suction paths 21 and 22 and communicates with the second through holes 311 and 312.

  The first through hole 301 and the second through hole 311 provided in the cylinder 14 of the upper compression mechanism 8 are closed by the upper closing member 18. On the upper surface of the cylinder 14 of the upper compression mechanism 8, a lateral groove 14 a extending from the first through hole 301 beyond the suction path 21 and communicating with the second through hole 311 is formed. The first through hole 301, the second through hole 311, the lateral hole 303, and the lateral groove 14a constitute a staying chamber 3a that surrounds the suction path 21 positioned above. The boundary between the suction pipe 3 and the suction port 8a may be located in a region corresponding to the staying chamber 3a, or may be located on the working chamber 25 side or the pressure vessel 6 side from the staying chamber 3a. Good. Further, the lateral groove 14 a may be formed not on the upper surface of the cylinder 14 but on the lower surface of the upper closing member 18.

  However, the staying chamber 3a only needs to be configured by at least the first through hole 301, and does not necessarily need to surround the upper suction path 21. For example, the lateral groove 14a is not provided, and the retention chamber 3a may be U-shaped opening upward. Alternatively, the second through hole 311 may not be provided, and the retention chamber 3 a may be U-shaped opening toward the vane 16. Furthermore, the staying chamber 3a may be L-shaped configured by the first through hole 301 and the lateral hole 303 or the lateral groove 14a.

  The first through hole 302 and the second through hole 312 provided in the cylinder 14 of the lower compression mechanism 8 are closed by the lower closing member 24. On the lower surface of the cylinder 14 of the lower compression mechanism 8, a lateral groove 14 b that extends from the first through hole 302 beyond the suction path 22 and communicates with the second through hole 312 is formed. The first through hole 302, the second through hole 312, the lateral hole 303, and the lateral groove 14b constitute a stay chamber 4a that surrounds the suction path 22 positioned below. The boundary between the suction pipe 4 and the suction port 8a may be located in a region corresponding to the staying chamber 4a, or may be located closer to the working chamber 25 or the pressure vessel 6 than the staying chamber 4a. Good. Further, the lateral groove 14 b may be formed not on the lower surface of the cylinder 14 but on the upper surface of the lower closing member 24.

  However, the staying chamber 4a only needs to be configured by at least the first through hole 302, and does not necessarily need to surround the lower suction path 22. For example, the lateral groove 14b is not provided, and the residence chamber 4a may be U-shaped opening downward. Alternatively, the second through-hole 312 may not be provided, and the staying chamber 4 a may be U-shaped opening toward the vane 16. Furthermore, the staying chamber 4a may be L-shaped configured by the first through hole 302 and the lateral hole 303 or the lateral groove 14b.

  The upper blocking member 18 is provided with a small through hole 18b, through which the upper staying chamber 3a is directly connected and the lower staying chamber 4a is passed through the upper staying chamber 4a. Slightly communicated with the reservoir 12. For this reason, the same oil as the oil reservoir 12 is held in the retention chambers 3a and 4a. Instead of the through hole 18b, a gap may be provided between the peripheral portion of the cylinder 14 of the upper compression mechanism 8 and the upper closing member 18 and / or the intermediate plate 19, or the cylinder of the lower compression mechanism 8 may be provided. A gap may be provided between the peripheral edge of 14 and the lower closing member 24 and / or the intermediate plate 19.

  Since the interior of the retention chamber 3a surrounding the upper suction passage 21 and the interior of the retention chamber 4a surrounding the lower suction passage 22 are substantially isolated from the oil reservoir 12, inflow of high-temperature oil from the oil reservoir 12 The oil in the staying chambers 3 a and 4 a stays without being affected by the flow of the oil reservoir 12.

  The thermal conductivity of the oil is low and is equivalent to a resin material used for a heat insulating material or the like, and the oil in the staying chambers 3a and 4a acts as a heat insulating layer around the upper suction passage 21 and the lower suction passage 22. To do.

  FIG. 8 is an oil temperature distribution diagram in the vicinity of the upper residence chamber 3a in the second embodiment, and shows a temperature distribution on the axis X extending in the horizontal direction from the center of the suction passage 21. FIG. This temperature distribution is the same in the vicinity of the lower residence chamber 4a.

  As shown in FIG. 8, temperature stratification occurs in the oil in the upper residence chamber 3 a and the lower residence chamber 4 a, and the vicinity of the suction paths 21 and 22 is lower than the temperature of the oil reservoir 12. As a result, the heat receiving from the oil reservoir 12 of the working fluid flowing through the suction paths 21 and 22 is suppressed, and the refrigeration capacity of the refrigeration cycle apparatus using the hermetic compressor 100C is improved.

  In the present embodiment, the vanes 16 of the compression mechanisms 8 are exposed to the oil reservoir 12, but the oil in the stay chambers 3 a and 4 a is affected by the oil flow caused by the behavior of the vanes 16 in the vane grooves 26. I do not receive it. As a result, since the temperature stratification is stabilized, the heat receiving from the oil reservoir 12 of the working fluid flowing through the suction paths 21 and 22 is suppressed, and the refrigeration capacity is improved.

  In the present embodiment, a lateral groove 14 a that connects the first through hole 301 and the second through hole 311 is provided on the upper surface of the cylinder 14 of the upper compression mechanism 8. With this configuration, the contact area between the upper closing member 18 and the cylinder 14 in the vicinity of the upper suction path 21 is reduced, and heat conduction from the upper closing member 18 to the cylinder 14 in the vicinity of the suction path 21 is suppressed. In addition, the oil is retained above the upper suction path 21 to form temperature stratification, thereby suppressing the heat reception from the oil reservoir 12 of the working fluid flowing through the suction path 22. Similarly, a lateral groove 14 b that connects the first through hole 302 and the second through hole 312 is provided on the lower surface of the cylinder 14 of the lower compression mechanism 8. With this configuration, the contact area between the lower closing member 24 and the cylinder 14 in the vicinity of the lower suction path 22 is reduced, and heat conduction from the lower closing member 24 to the cylinder 14 in the vicinity of the suction path 22 is suppressed. In addition, the oil is retained below the lower suction path 22 to form temperature stratification, so that the heat receiving from the oil reservoir 12 of the working fluid flowing through the suction path 22 is suppressed. As a result, the refrigeration capacity of the refrigeration cycle apparatus using the hermetic compressor 100C is significantly improved as compared with the case where the lateral grooves 14a and 14b are not provided. This effect is the same even when the lateral groove 14 a is provided on the lower surface of the upper closing member 18 and the lateral groove 14 b is provided on the upper surface of the lower closing member 24.

<Modification>
FIG. 11 is a longitudinal sectional view of a hermetic compressor 100D according to a modification of the second embodiment.

  In the embodiment, the first through hole 301 and the second through hole 311 provided in the cylinder 14 of the upper compression mechanism 8 are closed by the upper closing member 18. However, as shown in FIG. 11, the upper closing member 18 is provided with an opening 321 that is continuous with the first through hole 301 and the second through hole 311, and the upper muffler 33 is provided with an overhanging portion 33 a that closes the opening 321. It may be done. With this configuration, the upper staying chamber 3a is expanded to the upper surface of the upper closing member 18, so that it is possible to further suppress the heat receiving from the oil reservoir 12 of the working fluid flowing through the upper suction path 21. In this case, the staying chamber 3a and the oil reservoir 12 may be communicated with each other by regulating the amount of overhang of the overhang portion 33a.

  Similarly, in the embodiment, the first through hole 302 and the second through hole 312 provided in the cylinder 14 of the lower compression mechanism 8 are closed by the lower closing member 24. However, as shown in FIG. 11, the lower closing member 24 is provided with an opening 322 that is continuous with the first through hole 302 and the second through hole 312, and the lower muffler 34 is provided with an overhanging portion 34 a that closes the opening 322. It may be done. With this configuration, the lower staying chamber 4a is expanded to the lower surface of the lower closing member 24, so that the heat receiving from the oil reservoir 12 of the working fluid flowing through the lower suction path 22 can be further suppressed. it can.

  Further, the first through hole 301 provided in the cylinder 14 of the upper compression mechanism 8 and the first through hole 302 provided in the cylinder 14 of the lower compression mechanism 8 can be closed by the intermediate plate 19. is there.

  In addition, the said embodiment and said modification can be combined suitably.

  Further, the cylinder 14 does not necessarily have to be close to the inner peripheral surface of the pressure vessel 6 over the entire circumference, and is close to the inner peripheral surface of the pressure vessel 6 at least in the vicinity of the suction path (21 or 22). Just do it.

(Other embodiments)
The compression mechanism of the present invention is not necessarily a rotary type, and may be a scroll type, for example. Further, the pressure vessel 6 does not necessarily need to accommodate a pair of compression mechanisms, and may accommodate one compression mechanism. Furthermore, three or more compression mechanisms may be arranged in the pressure vessel 6.

  Further, the suction port 8a is not necessarily provided in the cylinder 14. For example, the suction port 8 a of the compression mechanism 8 located above is provided in the upper closing member 18 or the intermediate plate 19, and the suction port of the compression mechanism 8 located below is provided in the intermediate plate 19 or the lower closing member 24. Also good.

  The hermetic compressor of the present invention is useful as a compressor of a refrigeration cycle apparatus that can be used for an air conditioner, a hot water heater, a hot water heater, and the like.

100A to 10D Hermetic compressors 3, 4 Suction pipes 3a, 4a Retention chamber 8 Compression mechanism 8a Suction port 8b Discharge port 12 Oil reservoir 13 Space 14 Cylinders 14a, 14b Horizontal groove 15 Piston 16 Vane 18 Upper closing member (first closing member) )
19 Intermediate plate (second closing member)
21, 22 Suction path 24 Lower closing member (first closing member)
24a Transverse groove 25 Working chamber 25a Suction chamber 25b Compression-discharge chamber 33 Upper muffler 34 Lower muffler 33a, 34a Overhang part 211, 212, 251, 252 Partition member 201-203 Piece 301, 302 First through hole 311, 312 Second penetration Hole 303 Side hole 321,322 Opening

Claims (15)

A compression mechanism that compresses the working fluid sucked from the suction port and discharges it from the discharge port;
A pressure vessel that accommodates the compression mechanism, and in which an oil reservoir in which the compression mechanism is immersed is formed, and a space above the oil reservoir is filled with a working fluid discharged from the compression mechanism;
A suction pipe passing through the pressure vessel below the oil surface of the oil reservoir and connected to the suction port;
A retention chamber slightly communicating with the oil reservoir, in which oil is retained in at least a part of the periphery of the suction path constituted by the suction pipe and the suction port in the oil reservoir;
A hermetic compressor equipped with The compression mechanism includes a cylinder, a piston disposed in the cylinder such that a working chamber is formed between an outer peripheral surface of the cylinder and an inner peripheral surface of the cylinder, and the suction port opens the working chamber. A vane partitioning into a suction chamber and a compression-discharge chamber in which the discharge port opens,
The hermetic compressor according to claim 1, wherein an end portion of the vane opposite to the piston is exposed to the oil reservoir.   The hermetic compressor according to claim 2, wherein the suction port is provided in the cylinder.   The hermetic compressor according to claim 3, wherein the retention chamber is surrounded by a partition member disposed between the cylinder and the pressure vessel.   The hermetic compressor according to claim 4, wherein the partition member is divided into a plurality of pieces.   The hermetic compressor according to claim 4 or 5, wherein the partition member is made of resin. A plurality of the compression mechanism and the suction path are provided so as to be lined up and down,
The hermetic compressor according to any one of claims 4 to 6, wherein the partition member is disposed so as to form the staying chamber for each of the suction paths. The cylinder is close to the inner peripheral surface of the sealed container at least in the vicinity of the suction path;
4. The hermetic compressor according to claim 3, wherein the staying chamber includes a through hole that penetrates the cylinder on a side opposite to the vane with respect to the suction path. A first closing member provided with the discharge port that closes the working chamber on one side of the cylinder; and a second closing member that closes the working chamber on the opposite side of the first closing member;
The hermetic compressor according to claim 8, wherein the through hole is closed at least one of the first closing member and the second closing member. A first closing member provided with the discharge port that closes the working chamber on one side of the cylinder; a second closing member that closes the working chamber on the opposite side of the first closing member; and the discharge port. And a muffler that covers the space facing the first closing member,
The hermetic compressor according to claim 8, wherein the first closing member is provided with an opening continuous with the through hole, and the muffler is provided with an overhanging portion that closes the opening. The compression mechanism and the suction path are provided as a pair so as to be lined up and down,
An upper closing member for closing the working chamber of the compression mechanism located above from above;
A lower closing member for closing the working chamber of the compression mechanism located below from below;
The sealing according to claim 8, further comprising: an intermediate plate that closes the working chamber of the compression mechanism located above from below and closes the working chamber of the compression mechanism located below from above. Mold compressor.   The hermetic compressor according to claim 11, wherein the intermediate plate is provided with a lateral hole extending beyond the suction path from the through hole. A through hole provided in the cylinder of the compression mechanism located above is closed by the upper closing member,
The hermetic seal according to claim 11 or 12, wherein a lateral groove extending from the through hole beyond the suction path located above is formed in an upper surface of the compression mechanism located above or a lower surface of the upper bearing member. Mold compressor. A through hole provided in the cylinder of the compression mechanism located below is closed by the lower closing member,
14. A lateral groove extending from the through hole beyond the suction path located below is formed in a lower surface of the compression mechanism located below or an upper surface of the lower bearing member. The hermetic compressor according to item.   The hermetic seal according to any one of claims 12 to 14, wherein the cylinder is provided with a second through hole communicating with the horizontal hole and / or the horizontal groove between the suction path and the vane. Mold compressor.

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