JP4573613B2 - Compressor - Google Patents

Description

  The present invention is a hermetic compressor that compresses and discharges a fluid such as a refrigerant gas, and particularly has a compression member that rotates concentrically with a rotating shaft to compress the refrigerant gas or the like in a cylinder. It is about.

  Various types of compressors are known as compressors. Among them, a rotary compressor (rotary compressor) has a drive element and a compression element arranged in a sealed container, and the stator of the drive element is energized. Then, the rotor is axially rotated, the roller is eccentrically rotated in the cylinder of the compression element by the rotation shaft attached to the rotor, and the inside of the cylinder is separated from the low pressure chamber by the vane that is always in contact with the outer peripheral surface of the roller. It is divided into a high-pressure chamber, and the refrigerant gas sucked into the low-pressure chamber is compressed and discharged into the sealed container, and the high-pressure refrigerant gas is discharged from the sealed container and supplied to the refrigerant circuit. There is (for example, Patent Document 1).

  In the conventional rotary compressor, an eccentric disk portion is provided in the vicinity of the end of the rotating shaft that is pivotally attached to the rotor of the drive element, and a roller is rotatably disposed on the outer periphery of the eccentric disk portion. When the rotating shaft rotates as described above, the roller rotates eccentrically in the compression space of the cylinder along with the eccentric rotation of the eccentric disk portion, and compresses while moving the refrigerant gas in the cylinder from the low pressure chamber to the high pressure chamber. To do.

  In the rotary compressor having such a structure, an eccentric disk portion must be formed on the rotation shaft, and a roller must be rotatably provided on the outer periphery of the eccentric disk portion. In addition, the number of parts increases, which is one of the causes of cost increase. Further, since the roller rotates eccentrically via the eccentric disk portion, vibration and torque fluctuation tend to increase.

  In order to prevent deterioration in workability, increase in parts, and increase in vibration and torque fluctuation in the conventional rotary compressor, the combination of the eccentric disk portion and the roller of the rotary shaft is not used, but concentric with the rotary shaft. There is known a compressor in which a compression member is attached to a shaft and the refrigerant gas sucked by compressing the compression member in a compression space of a cylinder can be compressed (for example, Patent Document 2).

In the compressor provided with a compression member that rotates concentrically with the rotation shaft, an inclined plate is used as the compression member, and the refrigerant gas is guided to the compression space of the cylinder in order to compress the refrigerant gas on both sides of the inclined plate. Two suction paths and two discharge paths for discharging the compressed refrigerant gas must be provided. With such a structure, since the high pressure chamber and the low pressure chamber are adjacent to each other above and below the inclined plate in the entire area of the cylinder, the difference between the high pressure and the low pressure becomes large, and the efficiency deterioration due to refrigerant gas leakage becomes a problem. In order to prevent this, the present applicant has developed a compressor in which the compression member is formed of a relatively thick member and the refrigerant gas is compressed on one side, and a patent application has been filed earlier (Japanese Patent Application 2004). -003142).
JP-A-6-307363 Japanese Patent Application No. 2004-003142

  In the compressor according to the above prior application, a substantially cylindrical compression member is provided on the concentric shaft with respect to the rotating shaft, and a specially shaped inclined surface is formed on the upper surface of the compression member so that the refrigerant gas can be compressed. Thus, the rotor of the drive element is energized to rotate the rotor, the rotation shaft mounted on the rotor rotates the compression member concentrically within the cylinder of the compression element, and is constantly applied to the inclined surface of the compression member. The inside of the cylinder is divided into a low-pressure chamber and a high-pressure chamber through the vanes that are in contact with each other. The refrigerant gas sucked into the low-pressure chamber is compressed and discharged into the sealed container, and the high-pressure refrigerant gas is discharged from the sealed container. To be supplied to the refrigerant circuit.

  Schematically explaining the configuration of the compressor according to this prior application, the compression element is fixed to a hermetic container and is supported by a support member that is pivotally supported by a rotary shaft fixed to a rotor of a drive element, and is fixed to the support member. The cylinder that forms the compression space and the shaft that is fixed concentrically to the rotation shaft and rotates in the compression space of the cylinder and goes up from the highest dead center to the lowest dead center when one surface makes a round around the rotation axis. A compression member formed on a substantially sinusoidal inclined surface that returns to the dead center, and a vane slot provided in the support member is mounted via a coil spring, and the tip always contacts the inclined surface of the compression member so that the inside of the compression space Is provided with a vane for classifying the chamber into a low pressure chamber and a high pressure chamber.

  However, the compressor has a problem in that noise due to high-pressure refrigerant gas discharged from the high-pressure chamber of the cylinder into the hermetic container is generated, and the performance as the compressor is deteriorated due to flow path resistance against the high-pressure refrigerant gas. .

  The present invention has been made to solve the above problems, and provides a compressor that suppresses noise of the compressor and suppresses flow path resistance against high-pressure refrigerant gas to improve the performance as a compressor. The purpose is to do.

In order to achieve the above object, a compressor according to claim 1 of the present invention comprises a drive element (2) in a hermetic container (1) and a compression element (3) driven by the drive element (2). bets are placed, the compression element (3) comprises a support member for rotatably supporting by penetrating the rotary shaft (5) fixed to the rotor (6) of the drive element is fixed to the closed container (1) (2) (7), a cylinder (8) fixed to the support member (7) to form a compression space (20), and a compression space of the cylinder (8) fixed coaxially to the rotating shaft (5). A substantially sinusoidal inclined surface that rotates inside and returns to the top dead center through the bottom dead center (Q) that becomes the highest from the top dead center (P) that goes up around the rotation axis (5). And the vane slot (16) provided in the support member (7). A vane (11) that is mounted via a net (18) and whose tip always contacts the inclined surface of the compression member (9) to divide the compression space (20) into a low pressure chamber and a high pressure chamber, A compressor that compresses refrigerant gas sucked into the low-pressure chamber by the compression member (9) and discharges the refrigerant gas from the high-pressure chamber, on the side of the compression element (3), on the side of the cylinder (8) The provided notch (8b), the notch (7e) provided on the side of the support member (7) positioned above the cylinder (8) corresponding to the notch (8b), and the cylinder ( 8) It is comprised by the space enclosed by the partition plate (24) attached to the bottom face, the side wall of the said airtight container (1), and the ceiling plate of the said supporting member (7), and is discharged from the said high pressure chamber. provided with a muffler (23) for muting the refrigerant gas, the muffler ( 3) Oil that flows into the space constituting the refrigerant gas together with the refrigerant gas is provided with an outlet (7f) that is discharged from the space only on the ceiling of the support member (7), and in the upper region of the sealed container (1). A gap (10) through which oil separated from the refrigerant gas flows is provided between the hermetic container (1) and the stator (4) opposed thereto, and the stator (4) of the driving element (2) A slight gap (S) is provided between the rotor (6) and an outlet (7f) of the muffler (23) is connected to the gap (S) at the support member (7) below the slight gap (S). 10), the flow path through the gap (S) of the drive element (2) is a return flow path for the oil. Above the gap (10) and in the closed container (1) The flow path resistance with respect to the high-pressure refrigerant gas at the time of guiding to the partial area is low .

  According to the first aspect of the present invention, since the muffler is provided on the side of the compression element in the hermetic container of the compressor, the refrigerant gas discharged from the high pressure chamber of the cylinder can be silenced. Thereby, the noise of a compressor can be suppressed low.

Also, the according to the invention of claim 1, and a notch provided on the side of the cylinder, and the notch portion provided in correspondence with the notch on the side of the support member located on top of the cylinder, the The muffler can be easily configured by the space surrounded by the partition plate attached to the bottom surface of the cylinder and the side wall of the sealed container.

Furthermore, according to the first aspect of the present invention, since the outlet of the muffler is provided close to the lower position of the slight gap between the stator and the rotor of the drive element on the support member, the high-pressure refrigerant discharged from the muffler outlet The gas can be guided to the upper region in the hermetic container through a slight gap of the driving element having a low flow resistance against the high-pressure refrigerant gas. As a result, sufficient high-pressure refrigerant gas to be discharged from the discharge pipe at the upper end of the sealed container can be secured, oil contained in the discharge gas can be separated efficiently, and the performance as a compressor can be improved. .

Next, an embodiment of a compressor according to the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a schematic longitudinal sectional view showing an embodiment of a compressor according to the present invention. FIG. 2 is a schematic longitudinal sectional view passing through a vane in the compressor according to the embodiment of the present invention. FIG. 3 is a schematic cross-sectional view of the compressor according to the embodiment of the present invention. In each figure, 1 is an airtight container, which is constructed by welding an iron cover member having a substantially cylindrical shape with a lid to an upper end portion of a bottomed cylindrical iron storage member. The driving element 2 is disposed at a lower portion thereof, and a compression element 3 driven by the driving element 2 is disposed at a lower portion thereof.

  The drive element 2 includes an electric motor including a stator 4 fixed to the inner wall of the hermetic container 1 and a rotor 6 disposed inside the stator 4. The upper end portion of the shaft 5 is attached to the shaft. Between the outer peripheral part of the stator 4 of the drive element 2 and the sealed container 1, a plurality of gaps 10 communicating the upper and lower spaces are formed at a plurality of locations. Although not shown, a terminal is attached to the iron covering member of the sealed container 1 via an attachment member, and the terminal and the stator 4 are connected by an internal lead wire. Then, an external lead wire from an external power source is connected to the terminal so that the stator 4 is energized.

  The compression element 3 includes a support member 7 fixed to the inner wall of the sealed container 1, a cylinder 8 attached by bolts (not shown) below the support member 7, and a compression member disposed in the cylinder 8. 9 (referred to as a swash member in the present embodiment), a vane 11 attached to the support member 7 so as to be movable up and down, and a discharge valve 12 attached to the side surface of the notch 8b (FIG. 3) of the cylinder 8. Etc. Further, the central portion of the upper surface of the support member 7 protrudes upward in a concentric cylindrical shape to form a main bearing portion 13 of the rotating shaft 5, and the central portion of the lower surface protrudes downward in a concentric cylindrical shape to form a protruding portion 14. The lower surface 14a is a smooth surface.

  The support member 7 is provided with a vane slot 16, and the vane 11 is mounted in the vane slot 16 so as to be movable up and down. A back pressure hole 15 for applying a high pressure in the sealed container 1 as a back pressure to the vane 11 is formed in the upper portion of the vane slot 16, and a spring mounting hole 17 is provided in the center of the vane slot 16. A coil spring 18 for constantly biasing the vane 11 downward is mounted.

  A central portion of the cylinder 8 is recessed downward, and a compression space 20 is formed in the recessed portion 19. A sub-bearing portion 21 that supports the rotating shaft 5 is formed in an open state at the center of the bottom surface of the recessed portion 19 of the cylinder 8. As shown in FIG. 6, a space penetrating from the upper surface to the lower surface is provided in the central portion of the cylinder 8, the cover plate member 27 is attached to the lower surface of the cylinder 8 to constitute the compression space 20, and the cover plate member A shaft hole 27a serving as a sub-bearing portion may be provided in the central portion of 27 so that the lower end portion of the rotating shaft 5 is rotatably supported.

  As shown in FIG. 1, a pipe connection port 7 a and a passage 7 b and a suction port 7 c communicating with the pipe connection port 7 a are provided inside the support member 7, and the end of the suction port 7 c is connected to the compression space 20. Is open. Further, the end portion of the suction pipe 22 attached to the sealed container 1 is inserted and fixed to the pipe connection port 7 a of the support member 7. Thereby, the refrigerant gas supplied from the suction pipe 22 is sucked into the compression space 20 from the suction port 7 c through the passage 7 b of the support member 7.

  As shown in FIG. 3, the lower end edge of the protrusion 14 in the support member 7 is provided with a discharge port 7d that passes from the lower surface 14a side of the protrusion 14 to the outer peripheral surface side. It opens into the compression space 20, and the outer peripheral surface side of the discharge port 7 d communicates with a passage 8 a provided inside the cylinder 8. As shown in FIG. 1, the passage 8a of the cylinder 8 opens into the notch 8b. The discharge valve 12 is attached to the side surface of the notch 8 b of the cylinder 8, and the passage 8 a is opened and closed by the discharge valve 12. Thereby, the high-pressure refrigerant gas compressed in the compression space 20 passes through the passage 8 a of the cylinder 8 from the discharge port 7 c of the support member 7 and is discharged into the muffler 23 through the discharge valve 12.

  The muffler 23 is provided on the side of the compression element 3. As shown in FIG. 4, the support member 7 is provided with a notch 7 e corresponding to the notch 8 b of the cylinder 8, and the partition plate 24 is provided on the bottom surface of the cylinder 8. Is formed by a space surrounded by the notch 8b of the cylinder 8, the notch 7e of the support member 7, the partition plate 24, and the side wall of the sealed container 1 (see FIG. 1). Then, by providing the support member 7 with an outlet 7f, the space in the muffler 23 and the space in the sealed container 1 are communicated with each other. Further, the outlet 7f of the support member 7 is provided close to a position below the slight gap S between the stator 4 and the rotor 6 of the drive element 2. Thus, the high-pressure refrigerant gas discharged into the muffler 23 through the discharge valve 12 is silenced by the muffler 23 and discharged into the sealed container 1 from the outlet 7f of the support member 7, and most of the stator 4 Then, the air flows into the upper region in the sealed container 1 through a slight gap S between the rotor 6 and the rotor 6.

  The vane 11 is formed in a substantially rectangular plate shape, and is located in the middle of the suction port 7c and the discharge port 7d of the support member 7 opening in the compression space 20, as shown in FIG. The compression space 20 is divided into a low pressure chamber and a high pressure chamber by the vane 11.

  A swash member 9 is integrally provided at a lower portion of the rotating shaft 5, and the swash member 9 has a substantially cylindrical shape concentric with the rotating shaft 5 as an overall shape. 5 (a) and 5 (b) respectively show side views of the rotating shaft 5 including the swash member 9, and it has a thick part 9a on one side and a thin part 9b on the other side opposite thereto. The upper surface 9c along the circumferential direction is formed as a continuous inclined surface that is high at the thick portion 9a and low at the thin portion 9b. That is, the upper surface 9c of the swash member 9 has a substantially sine wave shape that returns from the highest dead center P to the highest dead center Q through the lowest dead center Q when it goes around the rotation axis 5 in the circumferential direction. Presents. The cross-sectional shape of the upper surface 9c passing through the rotating shaft 5 is parallel to the lower surface 14a of the protruding portion 14 of the support member 7 at any angle of 360 degrees with respect to the rotating shaft 5, and the upper surface 9c The space between the lower surface 14 a of the protruding portion 14 is the compression space 20.

  The top dead center P of the swash member 9 faces the lower surface 14a of the protruding portion 14 of the support member 7 so as to be movable through a minute clear lath. This clearance is sealed by the oil enclosed in the sealed container 1. Further, the vane 11 is formed in an arrow shape having a sharp lower end, and has a linear ridge line along the plate width direction, and the linear ridge line is always in contact with the upper surface 9c of the swash member 9. . The coil spring 18 always presses the vane 11 downward to hold the lower end of the vane 11 so as not to be separated from the upper surface 9c of the swash member 9, and the vane 11 smoothly moves along the vane slot 16 of the support member 7. Acts to control vertical movement.

  Further, as shown in FIG. 2, a slight clearance is formed between the outer peripheral surface of the swash member 9 and the inner wall surface of the recessed portion 19 in the cylinder 8 so that the swash member 9 is rotatable. This clearance is also sealed by the oil enclosed in the sealed container 1. This is to prevent leakage of the refrigerant gas.

  As shown in FIGS. 1 and 2, a discharge pipe 25 is attached to the upper end of the sealed container 1, and discharges high-pressure refrigerant gas accumulated in the upper region in the sealed container 1 to the outside. The high-pressure refrigerant gas discharged from the discharge pipe 25 is supplied to a refrigerant circuit (not shown), and the refrigerant gas circulated through the refrigerant circuit and having a low pressure is returned from the suction pipe 22 to the compressor.

  An oil reservoir 26 is formed at the inner bottom of the sealed container 1, and the oil in the oil reservoir 26 is supplied to a required portion of the compression element 3 via the rotary shaft 5. Furthermore, a predetermined amount of, for example, carbon dioxide, R134a, or HC refrigerant gas is sealed in the sealed container 1.

  The operation of the compressor according to the present invention configured as described above will be described. In this compressor, when the coil of the stator 4 of the drive element 2 is energized, the rotor 6 rotates. The rotation of the rotor 6 is transmitted to the swash member 9 through the rotating shaft 5, whereby the swash member 9 rotates concentrically with the rotating shaft 5 in the cylinder 8. When the top dead center P of the upper surface 9c of the swash member 9 is on the discharge side with the vane 11 as a boundary, the cylinder 8, the support member 7, the swash member 9 and the vane 11 on the suction port 7c side with the vane 11 as a boundary. The refrigerant gas is sucked into the space (low pressure chamber) surrounded by the suction pipe 22, the passage 7b of the support member 7 and the suction port 7c.

  When the swash member 9 rotates from this state, the volume of the low pressure chamber is reduced by the inclination of the upper surface 9c of the swash member 9 from the stage where the top dead center P passes the vane 11 and the suction port 7c, and the high pressure chamber is reduced. The refrigerant gas is compressed. Thus, the high-pressure refrigerant gas in the high-pressure chamber is discharged from the discharge port 7d until the top dead center P passes through the discharge port 7d of the support member 7. When the top dead center P passes through the suction port 7c of the support member 7, the volume of the low-pressure chamber increases, so that the refrigerant gas is sucked into the low-pressure chamber from the suction port 7c.

  The high-pressure refrigerant gas discharged from the high-pressure chamber to the discharge port 7d of the support member 7 passes through the passage 8a of the cylinder 8 and opens the discharge valve 12, and is discharged into the muffler 23. 7 is discharged into the sealed container 1 from the outlet 7f. The high-pressure refrigerant gas discharged into the sealed container 1 passes through the gap S of the driving element 2 and reaches the upper region in the sealed container 1, where it is separated from the oil, discharged from the discharge pipe 25, and supplied to the refrigerant circuit. Is done. On the other hand, the oil separated from the high-pressure refrigerant gas flows down from the gap 10 formed between the sealed container 1 and the stator 4 and returns to the oil reservoir 26.

  As described above, since the outlet 7f of the muffler 23 is provided close to the position below the slight gap S of the drive element 2, most of the high-pressure refrigerant gas discharged from the outlet 7f flows into the gap S. To do. A part of the high-pressure refrigerant gas flows into the gap 10, and the gap 10 is an oil return flow path as described above, and therefore the flow path resistance against the high-pressure refrigerant gas is increased. Is difficult to pass. On the other hand, most of the high-pressure refrigerant gas passes through the gap S because the flow path resistance to the high-pressure refrigerant gas is small. As a result, a sufficient amount of the high-pressure refrigerant gas discharged from the discharge pipe 25 can be secured in the upper region of the sealed container 1, and the performance as a compressor can be improved.

  The compressor according to the present invention can exhibit a sufficient compression function while being small in size and simple in structure. As described above, the swash member 9 has the continuous thick portion 9a and the thin portion 9b, and its upper surface 9c is inclined in a substantially sinusoidal shape, so that it corresponds to the high pressure chamber of the cylinder 8. In the thick portion 9a, the seal dimension between the inner wall surface of the compression space 20 can be sufficiently ensured. Thereby, generation | occurrence | production of the refrigerant | coolant gas leak between the swash member 9 and the cylinder 8 can be prevented now effectively, and the driving | operation with high compression efficiency is attained. Further, since the swash member 9 serves as a flywheel, torque fluctuation is reduced.

  In the above embodiment, when the cylinder 8 has the sub-bearing portion 21 of the rotating shaft 5, it is not necessary to separately provide a supporting member for the sub-bearing of the rotating shaft 5, reducing the number of parts and further downsizing. Is possible. Further, since the vane slot 16 and the spring mounting hole 17 for mounting the vane 11 on the support member 7 are provided, there is no need to provide a vane mounting mechanism in the cylinder 8 that requires high processing accuracy, and the workability is improved. The Furthermore, if the swash member 9 is formed integrally with the rotating shaft 5 as in the above embodiment, a member for attaching the swash member 9 to the rotating shaft 5 becomes unnecessary, and the number of parts can be further reduced.

  In the above embodiment, the compressor used by being incorporated in the refrigerant circuit of the refrigerator has been described. However, the present invention is not limited to this, and the present invention is effectively applied to, for example, an air compressor that sucks and compresses air. Can do.

  Especially this invention can be optimally utilized as a compressor for compressing refrigerant gas and supplying it to refrigerant circuits, such as a refrigerator.

It is a schematic longitudinal cross-sectional view which shows embodiment of the compressor which concerns on this invention. It is a schematic longitudinal cross-sectional view which passes along the location of the vane in embodiment of the compressor which concerns on this invention. It is a schematic cross-sectional view in the embodiment of the compressor concerning the present invention. It is a perspective view which shows the combined state of the drive element and compression element in embodiment of the compressor which concerns on this invention. (A), (b) is a side view of the rotating shaft containing the swash member in embodiment of the compressor based on this invention. It is a one part schematic longitudinal cross-sectional view in other embodiment of the compressor based on this invention.

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Drive element 3 Compression element 4 Stator 5 Rotating shaft 6 Rotor 7 Support member 7e Notch part 7f Outlet 8 Cylinder 8a Passage 8b Notch part 9 Swash member (compression member)
DESCRIPTION OF SYMBOLS 10 Clearance 11 Vane 12 Discharge valve 13 Main bearing part 13b Slit-like notch part 14 Protrusion part 15 Back pressure hole 16 Vane slot 17 Spring mounting hole 18 Coil spring 19 Depression part 20 Compression space 21 Sub bearing part 22 Suction piping 23 Muffler 24 Partition plate 25 Discharge pipe 26 Oil sump 27 Cover plate member S Slight gap between drive elements

Claims (1)

A drive element (2) and a compression element (3) driven by this drive element (2) are arranged in the sealed container (1),
It said compression element (3) is,
A support member (7) that is fixed to the hermetic container (1) and pivotally supported by a rotary shaft (5) fixed to the rotor (6) of the drive element (2);
A cylinder (8) fixed to the support member (7) to form a compression space (20);
It is fixed to the rotating shaft (5) coaxially and rotates in the compression space of the cylinder (8). When one surface makes a round around the rotating shaft (5), it is lowest from the top dead center (P). A compression member (9) formed on a substantially sinusoidal inclined surface that returns to the top dead center via the bottom dead center (Q),
A vane slot (16) provided in the support member (7) is attached via a spring (18), and the tip always contacts the inclined surface of the compression member (9) to reduce the pressure in the compression space (20). A vane (11) that is divided into a chamber and a high-pressure chamber,
A compressor that compresses the refrigerant gas sucked into the low-pressure chamber by the compression member (9) and discharges the refrigerant gas from the high-pressure chamber;
On the side of the compression element (3), there is a notch (8b) provided on the side of the cylinder (8), and on the side of the support member (7) located above the cylinder (8), the notch (8b) corresponding to the notch (7e), the partition plate (24) attached to the bottom surface of the cylinder (8), the side wall of the sealed container (1), and the support member (7) is constituted by a space surrounded by the top plate, provided with a muffler (23) for muting the refrigerant gas discharged from the high pressure chamber,
Provided only at the ceiling of the support member (7) is an outlet (7f) through which oil flowing into the space constituting the muffler (23) together with the refrigerant gas is discharged from the space;
In the upper region of the closed container (1), there is a gap (10) between the closed container (1) and the stator (4) facing the gap (10) through which the oil separated from the refrigerant gas flows, and
A slight gap (S) is provided between the stator (4) and the rotor (6) of the drive element (2),
The outlet of the muffler (23) (7f), in said supporting member (7) of the lower position of the small gap (S), who for the slight gap (S) than to the gap (10) is close Provided to be in a state ,
The high-pressure refrigerant gas when the flow path through the gap (S) of the drive element (2) is led to the upper region in the sealed container (1) rather than the gap (10) that is the return flow path of the oil. The flow path resistance against is low,
A compressor characterized by that.

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