JP5517592B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor in which compression units are arranged in multiple upper and lower stages.

  Some compressors that are applied to air conditioners and the like have compressors arranged in multiple stages. In this compressor, since a part of the lubricating oil that lubricates the compression portion during compression is contained in the refrigerant gas, the refrigerant gas and the lubricating oil (and liquid refrigerant) are separated and the refrigerant gas is supplied to the rotor. An accumulator is provided. The accumulator is provided with a suction pipe for supplying the refrigerant gas to each compression section in a container to which refrigerant gas, lubricating oil and liquid refrigerant are supplied. This accumulator is provided with an oil return hole in the suction pipe at the bottom of the container, and is configured to supply the lubricating oil accumulated in the bottom of the container to the compression section through the suction pipe. Has been.

  Conventionally, for example, the compressor (vertical sealed multi-cylinder compressor) described in Patent Document 1 has a plurality of compression units (compression mechanism units) on the upper and lower sides, compared to the lower compression unit. In order to prevent a situation in which the lubricating oil supplied to the compression section tends to be insufficient, sufficient lubricating oil is supplied to the upper compression section. The compressor described in Patent Document 1 utilizes the fact that the specific gravity of the liquid refrigerant is larger than that of the lubricating oil, and the oil return hole of the suction pipe is positioned up and down relative to the vertical position relationship of the compression unit. It is configured as follows. That is, when the lubricating oil containing liquid refrigerant is accumulated at the bottom of the accumulator, the ratio of the lubricating oil in the upper layer is relatively high, so that the lubricating oil flows from the oil return hole provided at this position to the upper compression part. Supplied.

Japanese Patent No. 4099929

  By the way, in the compressor which arrange | positions a compression part in the upper and lower multistage, the discharge port which discharges the compressed refrigerant gas is arrange | positioned in the upper compression part on the upper side, and the lower compression part discharges the compressed refrigerant gas A discharge port is disposed below the discharge port. By configuring in this way, it is possible to reduce the interval between the compression units, and thus it is possible to reduce the size of the compressor.

  Moreover, in each compression part, a part of lubricating oil is discharged from a discharge outlet with the compressed refrigerant gas. At this time, the lower compression section discharges the lubricating oil by scraping because the discharge port is disposed on the lower side, and the upper compression section performs lubrication because the discharge port is disposed on the upper side. Discharge to push up the oil. For this reason, as shown in FIG. 8, the oil compression which compresses lubricating oil in an upper compression part will arise. When oil compression occurs, it is not preferable because an excessive load is applied to the compression section.

  In the compressor described in Patent Document 1 described above, since a relatively large amount of lubricating oil is supplied to the upper compression section, excessive oil compression may occur.

  This invention solves the subject mentioned above, and aims at providing the compressor which can suppress the oil compression in a compression part.

  In order to achieve the above-described object, a compressor according to the present invention is a compressor including compression units arranged in upper and lower stages, and the amount of lubricating oil in the upper compression unit is set to be lower than that in the lower compression unit. An oil amount setting means for setting the amount less than the amount of lubricating oil is provided.

  According to this compressor, since the amount of lubricating oil in the upper compression section can be reduced by providing the oil amount setting means, oil compression in the compression section can be suppressed.

  Further, in the compressor of the present invention, each suction pipe connected to each of the compression sections to supply a refrigerant gas separated into gas and liquid, and lubricating oil provided in each of the suction pipes and separated into gas and liquid is supplied to each compression section. The oil amount setting means is configured as each oil return hole, and the oil return hole of the suction pipe connected to the upper compression portion includes: The oil return hole of the suction pipe connected to the lower compression part is formed with a small hole diameter, and the lower edge is provided at the same position or more.

  According to this compressor, the lubricating oil accumulated at the bottom of the accumulator is supplied from the oil return hole having a large hole diameter to the lower compression part, and is supplied from the oil return hole having a small hole diameter to the upper compression part. For this reason, the supply amount of the lubricating oil to the upper compression portion is smaller than the supply amount to the lower compression portion. Therefore, since the amount of lubricating oil in the upper compression part can be reduced, oil compression in the compression part can be suppressed.

  Further, in the compressor of the present invention, each suction pipe connected to each of the compression sections to supply a refrigerant gas separated into gas and liquid, and lubricating oil provided in each of the suction pipes and separated into gas and liquid is supplied to each compression section. The oil amount setting means is configured as each oil return hole, and the oil return hole of the suction pipe connected to the upper compression portion includes: The oil return hole of the suction pipe connected to the lower compression portion is formed in a small number, and the lower edge is provided at the same position or more.

  According to this compressor, the lubricating oil collected at the bottom of the accumulator is supplied from the large number of oil return holes to the lower compression section and from the small number of oil return holes to the upper compression section. For this reason, the supply amount of the lubricating oil to the upper compression portion is smaller than the supply amount to the lower compression portion. Therefore, since the amount of lubricating oil in the upper compression part can be reduced, oil compression in the compression part can be suppressed.

  Further, in the compressor according to the present invention, each of the compression units includes a compression chamber, a rotor that is rotatably provided in the compression chamber around a rotation shaft, and compresses the fluid in the compression chamber, and each of the compression units. A partition plate provided between and forming a part of the wall of the compression chamber in each compression section and having an insertion hole through which the rotation shaft is inserted; and an insertion of the partition plate provided inside the rotation shaft An oil supply passage for supplying lubricating oil into the hole, and the oil amount setting means is configured as the partition plate, and a sliding contact area of the upper compression portion with the rotor at a peripheral edge of the insertion hole. The lower compression portion is formed to have a larger area than the sliding contact area with the rotor.

  According to this compressor, the lubricating oil is supplied to the insertion hole of the partition plate from the oil supply passage provided inside the rotating shaft, and the pressure in the insertion hole is higher than the pressure in each compression chamber. Is supplied into each compression chamber through a slight gap between the slidable contact portion and the rotor. At this time, the supply amount of the lubricating oil to each compression chamber is such that the rotor of the upper compression unit having a large sliding contact area with the partition plate is smaller than the rotor of the lower compression unit having a small sliding contact area with the partition plate. Will be less. Therefore, since the amount of lubricating oil in the upper compression part can be reduced, oil compression in the compression part can be suppressed.

  Further, in the compressor according to the present invention, each of the compression sections includes a compression chamber, a rotor that is rotatably provided in the compression chamber around the rotation shaft, and compresses the fluid in the compression chamber, and the interior of the rotation shaft. And an oil supply passage that supplies lubricating oil to each compression chamber, and the oil amount setting means is configured as the oil supply passage and is provided corresponding to the upper compression portion. The oil supply passage is formed with a small hole diameter with respect to the oil supply passage provided corresponding to the compression portion on the lower side.

  According to this compressor, the lubricating oil is supplied from the oil supply passage provided inside the rotary shaft to each compression chamber via the oil supply passage. At this time, the supply amount of the lubricating oil to each compression chamber is smaller on the lower compression portion side where the hole diameter of the oil supply passage is smaller than on the lower compression portion side where the hole diameter of the oil supply passage is larger. . Therefore, since the amount of lubricating oil in the upper compression part can be reduced, oil compression in the compression part can be suppressed.

  According to the present invention, by reducing the amount of lubricating oil supplied to the upper compression section, oil compression in the compression section can be suppressed.

FIG. 1 is a schematic view of a compressor according to the present invention. FIG. 2 is a schematic diagram of the accumulator in the compressor according to Embodiment 1 of the present invention. FIG. 3 is a schematic diagram of an accumulator in the compressor according to Embodiment 2 of the present invention. FIG. 4 is a schematic diagram of an accumulator in the compressor according to Embodiment 3 of the present invention. FIG. 5 is a schematic diagram of an accumulator in the compressor according to Embodiment 3 of the present invention. FIG. 6 is a schematic diagram of a compression mechanism section in the compressor according to Embodiment 4 of the present invention. FIG. 7 is a schematic diagram of a compression mechanism section in the compressor according to Embodiment 5 of the present invention. FIG. 8 is a graph showing oil compression.

  Embodiments according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In addition, constituent elements in the following embodiments include those that can be easily replaced by those skilled in the art or those that are substantially the same.

[Embodiment 1]
The compressor 1 of this Embodiment is applied to an air conditioner, for example. Although not explicitly shown in the figure, the air conditioner is configured to include an outdoor unit disposed outdoors and an indoor unit disposed indoors, and a refrigerant is circulated between the outdoor unit and the indoor unit. By exchanging heat outside the room, the room is cooled, heated, or air-conditioned. In such an air conditioner, the compressor 1 is disposed in an outdoor unit, sucks and compresses refrigerant, and supplies the refrigerant to an outdoor unit or an external element of the indoor unit.

  As shown in FIG. 1, the compressor 1 includes a housing 2, a drive unit 3, a compression mechanism unit 4, and an accumulator 5.

  The housing 2 has a substantially cylindrical shape whose top and bottom are sealed, and the drive unit 3, the compression mechanism unit 4 and the like are accommodated therein. The casing 2 is arranged with its cylinder vertically set up, and a discharge pipe 21 is provided on the top thereof. The bottom of the housing 2 is configured as an oil reservoir 22, and the oil L 22 stores the lubricating oil L supplied to the compression mechanism unit 4.

  The drive unit 3 is a slot motor, and includes a stator 31, a rotor 32, and a rotation shaft 33. The drive unit 3 is fixed to the inner wall surface of the housing 2 by a stator 31. The rotor 32 is provided so as to be rotatable with respect to the stator 31 and is provided with the rotating shaft 33 directed vertically downward. The rotating shaft 33 has a lower end connected to the compression mechanism unit 4. The drive unit 3 is supplied with power from the outside of the housing 2 via a wiring (not shown).

  The compression mechanism unit 4 is disposed below the drive unit 3 in the housing 2. In the present embodiment, the compression mechanism unit 4 is configured by, for example, a two-cylinder rotary compression mechanism, and the first compression unit 41 and the second compression unit 42 are configured in upper and lower stages. Each compression unit 41, 42 is composed of rotors 411, 421 and compression chambers 412, 422, and is arranged along the axis of rotation of the rotation shaft 33. A partition plate 43 is provided between the compression units 41 and 42. The partition plate 43 partitions the compression portions 41 and 42 and constitutes part of the walls of the compression chambers 412 and 422. The partition plate 43 is formed with an insertion hole 431 through which the rotary shaft 33 is inserted. Bearings 44 and 44 are respectively provided on the upper side and the lower side of the compression parts 41 and 42, and the rotary shaft 33 is rotatably supported by the bearings 44. The rotary shaft 33 is provided with cranks 331 and 332 at positions corresponding to the compression portions 41 and 42, respectively. Rotors 411 and 421 are provided on the cranks 331 and 332 of the rotating shaft 33. In the compression mechanism unit 4, the power is supplied to the drive unit 3 and the rotation shaft 33 rotates, so that the rotors 411 and 421 rotate eccentrically in the compression chambers 412 and 422 by the cranks 331 and 332, respectively. The fluid in the compression chambers 412 and 422 is compressed.

  The rotating shaft 33 is provided with an oil supply passage 333 inside the lower end portion thereof. The lower end of the rotating shaft 33 is provided so as to reach the oil reservoir 22 of the housing 2, and the lubricating oil L is supplied from the lower end to the compression mechanism unit 4 through the oil supply passage 333. The oil supply passage 333 provided in the rotary shaft 33 includes an oil supply passage 333a that penetrates the crank 331 corresponding to the first compression portion 41 that is the upper compression portion and a first compression portion that is the lower compression portion. An oil supply passage 333b penetrating the crank 332 corresponding to the second compression portion 42 is provided.

  The accumulator 5 is disposed outside the housing 2 and includes a container 51, a first suction pipe 52, and a second suction pipe 53. The container 51 has a substantially cylindrical shape whose top and bottom are sealed, and an inflow pipe 511 is provided at the top thereof. The first suction pipe 52 is a pipe for supplying fluid to the first compression section 41 of the compression mechanism section 4, and one end thereof is connected to the compression chamber 412 of the first compression section 41. The second suction pipe 53 is a pipe for supplying fluid to the second compression section 42 of the compression mechanism section 4, and one end thereof is connected to the compression chamber 422 of the second compression section 42. Further, the suction pipes 52 and 53 are open at the other end, and are located inside the container 51 from the bottom of the container 51.

  In the compressor 1, refrigerant gas (fluid) that has passed through an external element (not shown) is supplied into the container 51 of the accumulator 5. The refrigerant gas is supplied to the compression units 41 and 42 through the suction pipes 52 and 53, respectively. The refrigerant gas is compressed by driving the compression units 41 and 42 by the drive unit 3. The compressed refrigerant gas is discharged from the discharge pipe 21 to the outside of the housing 2 and supplied to an external element (not shown).

  Here, lubricating oil L is supplied into the compression chambers 412 and 422 of the compression units 41 and 42. Accordingly, a part of the lubricating oil L supplied to the compression units 41 and 42 is supplied to the external element in a state of being included in the refrigerant gas compressed by the compression units 41 and 42. The accumulator 5 separates the lubricating oil L, which is a liquid, from the gaseous refrigerant gas, that is, gas-liquid separation. The accumulator 5 supplies the gas-liquid separated refrigerant gas to the compression chambers 412, 422, while the gas-liquid separated lubricating oil is supplied. Oil L is stored in the bottom of the container 51. The accumulator 5 has oil return holes 521 and 531 formed in the suction pipes 52 and 53 at positions where the lubricating oil L is stored at the bottom of the container 51, so that the lubricating oil L collected at the bottom of the container 51 is supplied to the accumulator 5. It is comprised so that it may return to each compression part 41,42. In addition, at the bottom of the container 51, the liquid refrigerant separated from the gas and liquid together with the lubricating oil L is also stored.

  In the compressor 1 described above, the first compression unit 41 that is the upper compression unit has a discharge port (not shown) that discharges the compressed refrigerant gas disposed on the upper side thereof, and is a second compression unit that is the lower compression unit. As for the compression part 42, the discharge port (not shown) which discharges the compressed refrigerant gas is arrange | positioned in the lower side. With this configuration, the space between the compression units 41 and 42, that is, the partition plate 43 can be thinned to narrow the space, so that the compressor 1 can be downsized.

  Moreover, in each compression part 41 and 42, a part of lubricating oil L is discharged from a discharge outlet with the compressed refrigerant gas. At this time, the second compression section 42 which is the lower compression section discharges the lubricating oil L so as to scrape off because the discharge port is disposed on the lower side, but the first compression which is the upper compression section. In the part 41, since the discharge port is arrange | positioned at the upper side, it discharges so that the lubricating oil L may be pushed up. For this reason, as shown in FIG. 8, the oil compression which compresses the lubricating oil L in the 1st compression part 41 which is an upper compression part is produced. When oil compression occurs, it is not preferable because an excessive load is applied to the compression mechanism unit 4.

  Therefore, in the compressor 1 of the present embodiment, the amount of the lubricating oil L of the first compression portion 41 that is the upper compression portion is changed to the amount of the lubricating oil L of the second compression portion 42 that is the lower compression portion. On the other hand, an oil amount setting means for setting a small amount is provided.

  By providing the oil amount setting means, it is possible to reduce the amount of the lubricating oil L in the first compression portion 41 that is the upper compression portion, so that the oil compression in the first compression portion 41 can be suppressed.

  FIG. 2 is a schematic diagram of the accumulator in the compressor according to Embodiment 1 of the present invention. As shown in FIG. 2, in the present embodiment, the oil amount setting means is provided in the accumulator 5. Specifically, the oil amount setting means of the present embodiment is configured as the oil return holes 521 and 531, and the oil return hole of the first suction pipe 52 connected to the first compression part 41 which is the upper compression part. 521 has the same hole diameter and number as the oil return hole 531 of the second suction pipe 53 connected to the second compression part 42 which is the lower compression part, and the lower edge is provided above. . That is, the oil return hole 521 is provided above the oil return hole 531.

  Then, as shown in FIG. 2, when the liquid level A accumulated in the bottom of the container 51 of the accumulator 5 reaches the position of the oil return hole 531 and does not reach the position of the oil return hole 521, the oil return hole 531. Only the lubricating oil L is supplied to the second compression part 42 and not supplied to the first compression part 41. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed.

  In addition, as shown in FIG. 2, when the liquid level B of the liquid accumulated in the bottom of the container 51 of the accumulator 5 reaches the position of the oil return hole 521, the depth (distance) from the liquid level B is the oil return. The hole 531 is deeper (far), and the depth (distance) from the liquid surface B is shallower (nearer) than the oil return hole 521. For this reason, since the pressure is proportional to the depth of the liquid, the pressure in the oil return hole 521 is lower than that in the oil return hole 531, and the lubricating oil L is higher than the supply amount to the second compression unit 42. The supply amount to one compression unit 41 is reduced. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed.

  By the way, in patent document 1 mentioned above, since the specific gravity of a liquid refrigerant is large compared with lubricating oil, since the ratio of lubricating oil in a comparatively upper layer part becomes comparatively high, it supplies from the oil return hole arrange | positioned on the upper side. It shows that the amount of lubricating oil to be increased. However, when each compression part 41 and 42 is driven by the drive part 3, since the lubricating oil L and the liquid refrigerant which accumulate in the bottom part of the container 51 of the accumulator 5 are in the mixed state, The supply amount of the lubricating oil L to the first compression portion 41 is smaller than the supply amount of the lubricating oil L. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed.

  Even if there is a situation in which the ratio of the lubricating oil L in the upper layer portion becomes high, the liquid level A of the liquid accumulated at the bottom of the container 51 of the accumulator 5 reaches the position of the oil return hole 531, and the oil return hole 521 When the position does not reach the position, only the oil return hole 531 supplies the lubricating oil L to the second compression unit 42 and does not supply the first compression unit 41. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed. Further, when the liquid level B of the liquid accumulated in the bottom of the container 51 of the accumulator 5 reaches the position of the oil return hole 521, the depth (distance) from the liquid level B is deeper in the oil return hole 531 ( Since the oil return hole 521 is shallower (nearer) than the oil return hole 521 in the depth (distance) from the liquid surface B, the lubricating oil L is supplied to the first compression unit 41 rather than the supply amount to the second compression unit 42. The amount of supply is reduced. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed. In the case of the liquid level B, even if the ratio of the lubricating oil L in the upper layer portion increases, each oil return hole 521 is located at a position where the ratio of the lubricating oil L in the upper layer portion increases. , 531 is always set, the supply amount of the lubricating oil L to the first compression portion 41 can be made smaller than the supply amount of the lubricating oil L to the second compression portion 42. In addition, even if there is a situation where the ratio of the lubricating oil L in the upper layer portion becomes high, this situation is temporary, and the amount of lubricating oil supplied from the oil return holes arranged on the upper side. When the total drive of each compression part 41, 42 is considered, the oil return hole is larger than the total supply amount of the lubricating oil L from the oil return hole 531 to the second compression part 42. The total supply amount of the lubricating oil L from 521 to the first compression unit 41 is smaller.

[Embodiment 2]
The present embodiment will be described with reference to the drawings. FIG. 3 is a schematic diagram of an accumulator in the compressor according to the second embodiment. In the second embodiment described below, the same reference numerals are given to the same components as those in the first embodiment described above, and the description thereof is omitted.

  As shown in FIG. 3, in the present embodiment, the oil amount setting means is provided in the accumulator 5. Specifically, the oil amount setting means of the present embodiment is configured as the oil return holes 521 and 531, and the oil return hole of the first suction pipe 52 connected to the first compression part 41 which is the upper compression part. 521 is formed in a small hole diameter with respect to the oil return hole 531 of the second suction pipe 53 connected to the second compression part 42 which is the lower compression part, and the lower edge is provided at the same position or more. . That is, the oil return hole 521 is smaller in diameter than the oil return hole 531 and is provided at the same height or higher.

  The liquid accumulated in the bottom of the container 51 of the accumulator 5 is supplied to the second compression part 42 from the oil return hole 531 having a large hole diameter, and is supplied to the first compression part 41 from the oil return hole 521 having a small hole diameter. For this reason, the supply amount of the lubricating oil L to the first compression unit 41 is smaller than the supply amount to the second compression unit 42. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed.

[Embodiment 3]
The present embodiment will be described with reference to the drawings. 4 and 5 are schematic views of the accumulator in the compressor according to the third embodiment. In the third embodiment described below, the same reference numerals are given to the same components as those in the first embodiment, and the description thereof is omitted.

  As shown in FIGS. 4 and 5, in the present embodiment, the oil amount setting means is provided in the accumulator 5. Specifically, the oil amount setting means of the present embodiment is configured as the oil return holes 521 and 531, and the oil return hole of the first suction pipe 52 connected to the first compression part 41 which is the upper compression part. 521 is formed in a small number with respect to the oil return hole 531 of the second suction pipe 53 connected to the second compression portion 42 which is the lower compression portion, and the lower edge is provided at the same position or more. . That is, the oil return holes 521 are smaller in number than the oil return holes 531 and are provided at the same height or higher. FIG. 4 shows an example in which a plurality (three) of oil return holes 531 are provided in the height direction for one oil return hole 521. FIG. 5 shows an example in which a single oil return hole 521 is provided, and a plurality (three) of oil return holes 531 are provided in the horizontal direction. Although not clearly shown in the figure, when a plurality of oil return holes are provided, if the suction pipe is provided at the front and back positions (preferably the front and back target positions), a drilling tool is passed through the suction pipe two at a time. Since the oil return hole can be formed, processing is easy.

  The liquid accumulated at the bottom of the container 51 of the accumulator 5 is supplied to the second compression unit 42 from the large number of oil return holes 531 and is supplied to the first compression unit 41 from the small number of oil return holes 521. For this reason, the supply amount of the lubricating oil L to the first compression unit 41 is smaller than the supply amount to the second compression unit 42. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed.

[Embodiment 4]
The present embodiment will be described with reference to the drawings. FIG. 6 is a schematic diagram of an accumulator in the compressor according to the fourth embodiment. Note that in the fourth embodiment described below, the same reference numerals are given to the same components as those in the first embodiment described above, and the description thereof is omitted.

  As shown in FIG. 6, in the present embodiment, the oil amount setting means is configured as a partition plate 43, and slidably contacts the rotor 411 of the first compression portion 41 that is the upper compression portion at the periphery of the insertion hole 431. The area is formed larger than the sliding contact area with the rotor 421 of the second compression portion 42 which is the lower compression portion. Specifically, the inner peripheral wall 431a of the insertion hole 431 through which the rotation shaft 33 is inserted in the partition plate 43 is inclined, and the opening W1 upward of the insertion hole 431 is small and the opening W2 downward is large. For this reason, at the periphery of the opening of the insertion hole 431, the sliding contact area S1 with the rotor 411 of the first compression part 41 that is the upper compression part is the same as the rotor 421 of the second compression part 42 that is the lower compression part. It becomes a large area with respect to the sliding contact area S2.

  The lubricating oil L is supplied to the rotors 411 and 421 through the cranks 331 and 332 from an oil supply passage 333 provided in the rotary shaft 33. The lubricating oil L that has passed through the cranks 331 and 332 from the oil supply passage 333 is supplied to the insertion holes 431 of the partition plate 43, and the pressure in the insertion holes 431 is higher than the pressure in the compression chambers 412 and 422. The air is supplied into the compression chambers 412 and 422 through a slight gap at the sliding contact portion between the peripheral edge of the insertion hole 431 and the rotors 411 and 421. At this time, the supply amount of the lubricating oil L to the compression chambers 412 and 422 is such that the sliding contact area S1 with the partition plate 43 with respect to the rotor 421 of the second compression section 42 with the small sliding contact area S2 with the partition plate 43 is reduced. The number of the rotors 411 of the first compression portion 41 having a larger value is smaller. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed.

[Embodiment 5]
The present embodiment will be described with reference to the drawings. FIG. 7 is a schematic diagram of an accumulator in the compressor according to the fifth embodiment. Note that in the fifth embodiment described below, the same reference numerals are given to the same components as those in the first embodiment described above, and the description thereof is omitted.

  As shown in FIG. 7, in the present embodiment, the oil amount setting means is configured as an oil supply passage 333, and an oil supply passage 333a provided corresponding to the first compression portion 41 that is the upper compression portion includes: A small hole diameter is formed with respect to the oil supply passage 333b provided corresponding to the second compression portion 42 which is the lower compression portion.

  Then, the lubricating oil L is supplied from the oil supply passage 333 provided in the rotary shaft 33 to the compression chambers 412 and 422 through the oil supply passages 333 a and 333 b of the cranks 331 and 332. At this time, the supply amount of the lubricating oil L to the compression chambers 412 and 422 is smaller on the first compression portion 41 side with a smaller hole diameter than on the second compression portion 42 side with a larger hole diameter of the oil supply passage 333a. Less. Therefore, since the amount of the lubricating oil L in the first compression part 41 that is the upper compression part can be reduced, oil compression in the first compression part 41 can be suppressed.

  As described above, the compressor according to the present invention is suitable for suppressing oil compression in the compression unit.

DESCRIPTION OF SYMBOLS 1 Compressor 2 Housing | casing 21 Discharge pipe 22 Oil reservoir 3 Drive part 31 Stator 32 Rotor 33 Rotating shaft 331, 332 Crank 333 (333a, 333b) Oil supply passage 4 Compression mechanism part 41 First compression part 411 Rotor 412 Compression Chamber 42 Second compression section 421 Rotor 422 Compression chamber 43 Partition plate 431 Insertion hole 431a Inner peripheral wall 44 Bearing 5 Accumulator 51 Container 52 First suction pipe 521 Oil return hole 53 Second suction pipe 531 Oil return hole A, B Liquid level L Lubricating oil S1, S2 Sliding contact area W1, W2 Opening

Claims (4)

A compressor provided with compression units arranged in upper and lower stages, and provided with an oil amount setting means for setting the amount of lubricating oil in the upper compression unit to be smaller than the amount of lubricating oil in the lower compression unit There,
Respective suction pipes connected to the respective compression parts and supplying refrigerant gas separated into gas and liquid, and oil return holes provided in the respective suction pipes and supplying lubricant oil separated into gas and liquid to the respective compression parts, respectively. An accumulator having
The oil amount setting means is configured as each oil return hole, and the oil return hole of the suction pipe connected to the upper compression part is connected to the compression pipe of the lower side. oil Modoana to less formed on the pore size, and compressors you characterized in that lower edge is provided over the same position. A compressor provided with compression units arranged in upper and lower stages, and provided with an oil amount setting means for setting the amount of lubricating oil in the upper compression unit to be smaller than the amount of lubricating oil in the lower compression unit There,
Respective suction pipes connected to the respective compression parts and supplying refrigerant gas separated into gas and liquid, and oil return holes provided in the respective suction pipes and supplying lubricant oil separated into gas and liquid to the respective compression parts, respectively. An accumulator having
The oil amount setting means is configured as each oil return hole, and the oil return hole of the suction pipe connected to the upper compression part is connected to the compression pipe of the lower side. oil Modoana hand, are less formed a number, and compressors you characterized in that lower edge is provided over the same position. A compressor provided with compression units arranged in upper and lower stages, and provided with an oil amount setting means for setting the amount of lubricating oil in the upper compression unit to be smaller than the amount of lubricating oil in the lower compression unit There,
Each compression section is provided between a compression chamber, a rotor that is rotatably provided in the compression chamber around a rotation axis and compresses fluid in the compression chamber, and each compression section provided between the compression sections. A partition plate that forms a part of the wall of the compression chamber and has an insertion hole through which the rotation shaft is inserted, and an oil supply that is provided inside the rotation shaft and supplies lubricating oil into the insertion hole of the partition plate A passage and
The oil amount setting means is configured as the partition plate, and at the periphery of the insertion hole, the sliding contact area of the upper compression part with the rotor is the sliding contact area of the lower compression part with the rotor. respect, compressors you characterized in that it is formed in a large area. A compressor provided with compression units arranged in upper and lower stages, and provided with an oil amount setting means for setting the amount of lubricating oil in the upper compression unit to be smaller than the amount of lubricating oil in the lower compression unit There,
Each compression unit includes a compression chamber, a rotor that is rotatably provided in the compression chamber around a rotation axis, and compresses fluid in the compression chamber, and is provided in the rotation shaft and is provided in each compression chamber. And an oil supply passage for supplying lubricating oil,
The oil amount setting means is configured as the oil supply passage, and the oil supply passage provided corresponding to the upper compression portion is provided with the oil supply passage provided corresponding to the lower compression portion. respect, compressors you characterized in that it is formed into small hole diameter.

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