JP2010168960A - Screw compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a screw compressor improving maintenance properties. <P>SOLUTION: In the screw compressor driving with an inside of an operation chamber kept under no-lubrication state and lubricating bearings 10, 11 and the like by oil filled in a casing 2, a splash member 23A is provided at a discharge side of a male rotor 1 and oil splashed from an oil pocket of an oil chamber 22 on the discharge side by the splash member 23A is supplied to the discharge side bearing 10 and the like. A splash member 23B is provided on a suction side of the male rotor 1 and oil splashed from an oil pocket of an oil chamber 36 on the suction side by the splash member 23B is supplied to the suction side bearing 11 and the like. Communication piping 40 providing communication between a lower part of the oil chamber 22 on the discharge side and the oil chamber 36 on the suction side is provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a screw compressor that drives an operating chamber in an oil-free state, and more particularly to a screw compressor that lubricates a bearing with oil sealed in a casing.

  A screw compressor generally includes a male rotor and a female rotor, a casing that houses the male rotor and the female rotor, and forms a working chamber between the male rotor and the tooth groove of the female rotor, a male rotor, A bearing on one axial side (discharge side) and the other side (suction side) for rotatably supporting the female rotor is provided. One of the male rotor and the female rotor (hereinafter referred to as “drive rotor”) is connected to the rotating shaft of the motor, and the male rotor and the female rotor are connected to each other via a timing gear, and the rotational power of the motor is transmitted. Thus, the male rotor and the female rotor rotate in conjunction with each other. Along with the rotation of the male rotor and the female rotor, gas (for example, atmospheric pressure air) is sucked into the working chamber from the suction port and compressed, and the compressed gas is discharged from the discharge port. As such a screw compressor, an oil-free type is known in which the working chamber is driven in an oil-free state, and is used in the field of manufacturing electronic devices, foods, pharmaceuticals, and the like.

  As one of bearing lubrication devices in an oil-free screw compressor, for example, in order to reduce the size of the compressor, one that lubricates the bearing with oil sealed in a casing has been proposed (see, for example, Patent Document 1). ). In Patent Document 1, a bearing, a timing gear, and a disc-shaped flip-up member are provided in the order in the axial direction on the discharge side of the drive rotor. It is designed to splash oil from the sump. A plurality of grooves (concave portions) are formed on the outer peripheral surface of the flip-up member, and a flip-up guide portion is provided so as to cover the outer peripheral surface of the flip-up member. A transfer chamber is formed between the two. As a result, the amount of oil splashed up by the flip-up member is increased. In addition, a conveyance guide portion is provided to guide the oil released from the conveyance chamber due to the centrifugal force accompanying the rotation of the flip-up member to the discharge-side bearing. As a result, even when the timing gear is disposed between the spring-up member and the discharge-side bearing, it is possible to supply the oil jumped up by the spring-up member to the discharge-side bearing.

JP 2006-144781 A

  In the screw compressor described in Patent Document 1, the oil sump on the discharge side is provided by the above-described lubrication device (specifically, the rotor discharge-side flip-up member, and the guide member including the spring-up guide portion and the conveyance guide portion). The oil is sprinkled up and supplied to the discharge-side bearing to lubricate the discharge-side bearing. On the other hand, the bearing on the suction side is lubricated with grease. Therefore, in order to improve the lubrication performance of the suction side bearing, for example, a method of providing a splashing member on the suction side of the rotor, and splashing up the oil by the jumping member and supplying the oil to the suction side bearing can be considered. However, in such a case, it is necessary to form an oil sump (oil chamber) on the suction side.

  Here, for example, assuming that the oil chamber on the discharge side and the oil chamber on the suction side are configured to be independent from each other, the amount of heat differs between the discharge side and the suction side. Degradation speed differs with oil that has lubricated the suction side bearing. For this reason, it is necessary to change the oil at different times, which takes time and effort for management. Therefore, there is room for improvement in terms of maintainability.

  The objective of this invention is providing the screw compressor which can improve maintainability.

  (1) In order to achieve the above object, the present invention is arranged on a casing, a pair of male and female rotors housed in the casing, and one side and the other side in the axial direction of the rotor, and the rotor can be rotated. And a shaft seal device provided between the bearing and the working chamber. The bearing chamber is driven in an oil-free state, and the bearing is lubricated with oil sealed in the casing. In the screw compressor, a first oil chamber that is formed on one side in the axial direction of the rotor in the casing and accumulates oil, and provided on one side in the axial direction of the rotor, rotates together with the rotor, and the first oil chamber. A first splashing member that splashes the oil accumulated in the cylinder and supplies the oil to the one bearing in the axial direction; and a first splashing member that is formed on the other axial side of the rotor in the casing and accumulates the oil. An oil chamber and a second spring that is provided on the other axial side of the rotor, rotates together with the rotor, splashes up the lubricating oil accumulated in the second oil chamber, and supplies it to the bearing on the other axial side A raising member, and a communication channel communicating the lower part of the first oil chamber and the lower part of the second oil chamber.

  (1) In order to achieve the above object, the present invention is arranged on a casing, a pair of male and female rotors housed in the casing, and one side and the other side in the axial direction of the rotor, and the rotor can be rotated. And a shaft seal device provided between the bearing and the working chamber. The bearing chamber is driven in an oil-free state, and the bearing is lubricated with oil sealed in the casing. In the screw compressor, a first oil chamber that is formed on one side in the axial direction of the rotor in the casing and accumulates oil, and provided on one side in the axial direction of the rotor, rotates together with the rotor, and the first oil chamber. A flip-up member that jumps up the oil stored in the first tank, a first introduction passage that introduces a part of the oil splashed up by the splash-up member into the bearing on the one axial side, and the jump-up portion A second introduction flow path for introducing a part of the oil splashed up by the bearing to the other axial bearing, and the second axial passage on the other axial side of the rotor in the casing to lubricate the second axial bearing A second oil chamber for storing the oil, and a communication channel that communicates the lower portion of the first oil chamber and the lower portion of the second oil chamber.

  (3) In the above (1) or (2), preferably, an oil level gauge indicating the amount of oil is provided only in one of the first oil chamber and the second oil chamber, and the first oil chamber And only one of the second oil chambers is provided with a replenishing port for replenishing oil from the outside, and only one of the first oil chamber and the second oil chamber is supplied with oil to the outside. A discharge port is provided for discharging.

  (4) In any one of the above (1) to (3), preferably, the flip-up member is a disk-shaped member and has a plurality of concave portions partitioned in the circumferential direction on the outer peripheral side thereof. .

  (5) In the above (4), preferably, the first guide is formed so as to cover the outer peripheral surface of the flip-up member, and holds oil flowing into the recess of the jump-up member, and connected to the first guide And a second guide for guiding the oil released from the recess of the spring-up member by the centrifugal force accompanying the rotation of the spring-up member toward the bearing.

  (6) In the above (5), preferably, the first guide and the second guide are formed integrally with the casing.

  According to the present invention, the first oil chamber and the second oil chamber can share oil by providing a communication channel that communicates the lower portion of the first oil chamber and the lower portion of the second oil chamber, The deterioration rate of can also be the same. Therefore, maintainability can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view illustrating the overall structure of a screw compressor according to a first embodiment of the present invention.

  In FIG. 1, the screw compressor is, for example, an oil-free / water-injected type (specifically, water is injected into the working chamber while the working chamber is in an oil-free state), and the axial direction is substantially parallel. A male rotor 1 and a female rotor (not shown) that rotate so as to mesh with each other in a non-contact manner, and a casing 2 that houses the male rotor 1 and the female rotor are provided.

  The casing 2 includes a main casing 3 that houses the male rotor 1 and the female rotor and forms a working chamber between the male and female rotors, and one end (discharge side, right side in FIG. 1) end of the main casing 3. A discharge-side casing 4 connected to the end, a gear cover 6 connected to the end of the discharge-side casing 4 to accommodate the timing gear 5 and the like, and the other side (suction side, left side in FIG. 1) end of the main casing 4 And a cover 7 attached to the cover. A suction port 8 is formed in the main body casing 3, and a discharge port 9 is formed in the discharge side casing 4.

  A bearing 10 (for example, a combination of a roller bearing and a ball bearing) is disposed on one axial side of the male rotor 1 (discharge side, right side in FIG. 1), and the other axial side of the male rotor 1 (suction side, FIG. A bearing 11 (for example, a roller bearing) is disposed on the left side of 1, and the male rotor 1 is rotatably supported by the bearings 10 and 11. Similarly, bearings are arranged on one side and the other side in the axial direction of the female rotor, and the female rotor is rotatably supported by these bearings. Further, shaft sealing devices 12 and 13 are provided between the tooth groove portion of the male rotor 1 and the discharge side bearing 10, and a shaft sealing device 14 is provided between the tooth groove portion of the male rotor 1 and the suction side bearing 11. Thus, the lubricating oil of the bearings 10 and 11 is prevented from flowing into the working chamber. Similarly, a shaft seal device (not shown) is provided between the tooth groove portion of the female rotor and the discharge side bearing, and a shaft seal device (not shown) is provided between the tooth groove portion of the female rotor and the suction side bearing. ) Is provided to prevent the lubricating oil of the bearing from flowing into the working chamber.

  A suction end of the male rotor 1 protrudes from the cover 7 to the outside, and a pulley 15 is provided. A belt 18 is bridged between the pulley 15 and a pulley 17 provided on the rotating shaft of the motor 16. ing. Thereby, the rotational power of the motor 16 is transmitted to the male rotor 1. A timing gear (however, only the timing gear 5 on the male rotor 1 side is shown in the figure) is provided at the discharge side end of the male rotor 1 and the discharge side end of the female rotor. The rotor rotates in conjunction with it. As the male rotor 1 and the female rotor rotate, gas (for example, atmospheric pressure air) is sucked into the working chamber from the suction port 8 and compressed, and the compressed gas is discharged from the discharge port 9. .

  The main casing 3 is formed with water injection holes 19 for injecting water into the working chamber of the compression stroke. And by injecting water into the working chamber from the water injection hole 19, the sealing effect and cooling effect of the working chamber can be obtained. The water injected into the working chamber is discharged from the discharge port 9 together with the compressed gas. Therefore, the discharge system of the compressor is provided with a water separator (not shown) that separates and stores water from the compressed gas. The water stored in the water separator is jetted into the working chamber from the water jet hole 19 due to the pressure difference between the internal pressure of the water separator and the working chamber.

  The discharge-side casing 4 is formed with an air opening hole 20 for relieving pressure (positive pressure) in the space between the shaft seal device 12 and the shaft seal device 13 of the male rotor 1. Even if this water leaks, it is prevented from entering the discharge-side bearing 10. Similarly, an air opening hole (not shown) is formed to relieve pressure in the space between the shaft seal device and the shaft seal device of the female rotor, and water in the working chamber enters the bearing on the discharge side. It is supposed not to. Further, the main casing 3 is formed with an air release hole 21 for relieving pressure (negative pressure) in the space between the shaft seal device 14 of the male rotor 1 and the suction port 8. Similarly, an air release hole (not shown) is formed to relieve pressure (negative pressure) in the space between the shaft seal device of the female rotor and the suction port 8.

  Next, a bearing lubrication device, which is a main part of the present embodiment, will be described.

  2 is a partially enlarged view of a portion II in FIG. 1, and FIG. 3 is a sectional view taken along a section III-III in FIG. FIG. 4 is a perspective view showing a detailed structure of the gear cover. FIG. 5 is a side view showing the structure of the flip-up member, and FIG. 6 is a cross-sectional view taken along section VI-VI in FIG.

  2 to 6 and FIG. 1 described above, the discharge-side casing 4 and the gear cover 6 are formed with a discharge-side oil chamber 22 for storing oil sealed in the casing 2. A disc-shaped flip-up member 23A is provided on the discharge side end of the male rotor 1 outside the bearing 10 and the timing gear 5 (on the right side in FIGS. 1 and 2). A through hole 24 that fits with the shaft portion of the male rotor 1 is formed at the radial center of the flip-up member 23A, and a plurality of grooves that are partitioned by ribs 25 in the circumferential direction are formed on the outer peripheral surface of the flip-up member 23. A (recess) 26 is formed. Note that the jumping member 23A has a diameter larger than that of the timing gear 5, and for example, the timing gear 5 is not immersed in the oil reservoir of the discharge side oil chamber 22, and the lower part of the jumping member 23A is an oil reservoir. Soaked in. Thereby, the rotation loss of the male rotor 1 and the female rotor can be reduced.

  Further, an arc-shaped (in this embodiment, an arc shape of about 270 degrees) flip-up guide portion 27 is provided so as to cover the outer peripheral surface of the flip-up member 23A, and the jump-up guide portion 27 and the jump-up member 23A A transfer chamber (filling chamber) is formed between the groove 26. As the spring-up member 23A rotates, the oil in the oil reservoir in the discharge-side oil chamber 22 is filled in the transfer chamber and transferred to the upper circumferential direction. Thereby, compared with the case where the flip-up guide part 27 is not provided, for example, the amount of oil splashed up by the flip-up member 23A is increased.

  In addition, an opening (discharge port) 28 is formed in a part of the flip-up guide portion 27 in the circumferential direction, and a discharge guide portion 29 is connected to the opening 28. In the discharge guide 29, a flow path is formed for guiding oil released from the groove 26 of the splashing member 23A upward by the centrifugal force of the splashing member 23A. A supply guide portion 30 is connected to the discharge guide portion 29, and a flow path for dividing oil from the discharge guide portion 29 to the male rotor 1 side and the female rotor side is formed in the supply guide portion 30. .

  The flip-up guide part 27, the discharge guide part 29, and the supply guide part 30 are formed integrally with the gear cover 6. Thereby, the rigidity of guide parts 27, 29, and 30 is raised. In addition, the number of parts is reduced and the assembly accuracy is increased. The gear cover 6 is positioned by providing a knock pin 31 on the connection surface with the discharge-side casing 4. As a result, the accuracy of the gap between the spring-up member 23A and the spring-up guide portion 27 is increased, and the leakage of oil is reduced.

  The bearing retainer 32 that fixes the outer ring of the discharge-side bearing 10 of the male rotor 1 is provided with a supply hole 33 at a position corresponding to the shaft portion of the timing gear 5 of the male rotor 1. Then, the oil dropped from the supply hole 34 </ b> A of the supply guide part 30 is supplied to the shaft of the timing gear 5 on the male rotor 1 side through the supply hole 33 of the bearing retainer 32. A part of the oil supplied to the shaft portion of the timing gear 5 is supplied to the discharge-side bearing 10 and lubricated, and the surplus part falls into the discharge-side oil chamber 22. That is, the discharge guide portion 29, the supply guide portion 30, and the supply hole 33 of the bearing retainer 32 described above constitute an introduction flow path for introducing the oil splashed up by the splash-up member 23A into the discharge-side bearing 10. Yes. Note that the oil that has lubricated the discharge-side bearing 10 returns to the discharge-side oil chamber 22 via the oil recovery groove 35 (outflow passage).

  Similarly, a bearing retainer (not shown) for fixing the outer ring of the discharge-side bearing of the female rotor is provided with a supply hole (not shown) at a position corresponding to the shaft portion of the timing gear on the female rotor side. . Then, the oil dropped from the supply hole 34B of the supply guide 30 is supplied to the shaft of the timing gear on the female rotor side through the supply hole of the bearing retainer. A part of the oil supplied to the shaft portion of the timing gear is supplied to the discharge-side bearing and lubricated, and the surplus part falls into the discharge-side oil chamber 22. That is, the discharge guide part 29, the supply guide part 30, the supply hole of the bearing retainer, and the like described above constitute an introduction flow path for introducing the oil splashed by the splash member 23A into the discharge side bearing. The oil that has lubricated the discharge-side bearing returns to the discharge-side oil chamber 22 via an oil recovery groove (outflow passage) (not shown).

  On the other hand, the main body casing 3 is formed with an oil chamber 36 on the suction side for storing the oil sealed in the casing 2. A disc-like flip-up member 23 </ b> B is provided outside the bearing 11 at the suction side end of the male rotor 1. The flip-up member 23B has the same structure as the above-described flip-up member 23A (however, it may be a disk-shaped member in which the plurality of grooves 26 are not formed). A disk-like member (not shown) having a diameter smaller than (or the same as) the timing gear 5 and not interfering with the flip-up member 23B is provided at the suction side end of the female rotor. Yes.

  The bearing retainer 37 that fixes the outer ring of the suction side bearing 11 of the male rotor 1 is provided with a supply hole 38 at a position corresponding to the shaft portion of the flip-up member 23B. Then, the oil splashed by the flip-up member 23B is supplied to the shaft portion of the flip-up member 23B through the supply hole 38 of the bearing retainer 37 and the like. A part of the oil supplied to the shaft portion of the spring-up member 23B is supplied to the suction side bearing 11 and lubricated, and the surplus part falls into the suction side oil chamber 36. That is, the supply hole 38 and the like of the bearing retainer 37 constitute an introduction flow path for introducing the oil bounced up by the bounce-up member 23B into the suction side bearing 11. The oil that has lubricated the suction-side bearing 11 returns to the suction-side oil chamber 36 via the oil recovery groove 39 (leading flow path).

  Similarly, a supply hole (not shown) is provided at a position corresponding to the shaft portion of the disk-shaped member described above in a bearing retainer (not shown) for fixing the outer ring of the suction side bearing of the female rotor. . Then, the oil splashed up by the flip-up member 23B is supplied to the shaft portion of the disk-like member through the bearing retainer supply hole and the like. A part of the oil supplied to the shaft portion of the disk-shaped member is supplied to the suction side bearing and lubricated, and the surplus part falls into the suction side oil chamber 36. In other words, the bearing retainer supply hole and the like constitute an introduction flow path for introducing the oil bounced up by the bounce-up member 23B into the suction side bearing. The oil that has lubricated the suction-side bearing returns to the suction-side oil chamber 36 via an oil recovery groove (outflow passage) (not shown).

  In the present embodiment configured as described above, the oil splashed from the oil reservoir of the discharge-side oil chamber 22 by the discharge-side spring-up member 23A of the male rotor 1 is supplied to the discharge-side bearing 10 and the like. Then, oil that lubricates the discharge-side bearing 10 and the like is collected in the oil chamber 22 on the discharge side. On the other hand, the oil splashed from the oil reservoir of the suction side oil chamber 36 by the suction side spring member 23B of the male rotor 1 is supplied to the suction side bearing 11 and the like, and the oil that lubricates the suction side bearing 11 and the like Is collected in the oil chamber 36 on the suction side. Here, for example, assuming that the oil chamber 22 on the discharge side and the oil chamber 36 on the suction side are configured to be independent from each other, the amount of heat differs between the discharge side and the suction side. The deterioration rate differs between the lubricated oil and the oil lubricated on the suction side bearing 11 and the like. For this reason, it is necessary to change the oil at different times, which takes time and effort for management. Therefore, in the present embodiment, a communication pipe 40 (communication passage) that connects the lower portion of the discharge side oil chamber 22 and the lower portion of the suction side oil chamber 36 is provided. As a result, the oil chamber 22 on the discharge side and the oil chamber 36 on the suction side can share oil, and the oil deterioration rate can be the same. Therefore, maintainability can be improved.

  Further, since the oil level height is the same between the oil chamber 22 on the discharge side and the oil chamber 36 on the suction side, the oil level gauge 41 may be provided only in the oil chamber 22 on the discharge side, for example. Further, a replenishment port 42 for replenishing oil from the outside may be provided only in the oil chamber 36 on the suction side, for example, and a discharge port 43 for discharging oil to the outside may be provided only in the oil chamber 42 on the discharge side, for example. . As a result, it is possible to easily check the amount of oil and change the oil. In order to balance the pressure in the oil chamber on the discharge side and the oil chamber on the suction side, an air opening port may be provided in at least one, and a breather 44 for preventing mist scattering may be provided in the air opening port.

  In the first embodiment, the case where the flip-up guide part 27, the discharge guide part 29, and the supply guide part 30 are provided corresponding to the discharge-side flip-up guide member 23A has been described as an example. It is not limited to this. That is, a flip-up guide portion, a discharge guide portion, and a supply guide portion may be provided corresponding to the suction-side flip-up guide member 23B. In this case, the same effect as described above can be obtained.

  A second embodiment of the present invention will be described with reference to FIG. In this embodiment, the flip-up member 23B is not provided on the suction side of the male rotor 1, and oil is supplied from the supply guide portion 30 on the discharge side to the bearing 11 on the suction side.

  FIG. 7 is a cross-sectional view showing the overall structure of the screw compressor according to the present embodiment. In FIG. 7, parts equivalent to those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  In the present embodiment, the spring-up member 23B is not provided at the suction side end of the male rotor 1, and a disk-like member 45 having a diameter smaller than (or the same as) the timing gear 5 is provided. Similarly, a disk-like member (not shown) having a diameter smaller than (or the same as) the timing gear 5 and not interfering with the disk-like member 45 is provided at the suction side end of the female rotor. It has been. Further, the supply connecting the supply guide 30 of the gear cover 6 and the main body casing 2 (specifically, the position corresponding to the supply hole 38 of the bearing retainer 37 on the male rotor 1 side and the supply hole of the bearing retainer on the female rotor side). A pipe 46 is provided.

  A part of the oil supplied from the supply guide 30 to the main casing 2 via the supply pipe 46 is supplied to the shaft of the disk-like member 45 on the male rotor 1 side via the supply hole 38 of the bearing retainer 37. Is done. A part of the oil supplied to the shaft portion of the disk-like member 45 is supplied to the suction side bearing 11 and lubricated, and the surplus part falls into the suction side oil chamber 36. That is, the discharge guide part 29, the supply guide part 30, the supply pipe 46, the supply hole 38 of the bearing retainer 37, and the like described above introduce the oil that has been splashed by the splash member 23A into the suction-side bearing 11. Is configured. The oil that has lubricated the suction-side bearing 11 is led out to the suction-side oil chamber 36 via the oil recovery groove 39 (leading flow path).

  Similarly, part of the oil supplied from the supply guide 30 to the main casing 2 via the supply pipe 46 is supplied to the shaft of the disk-like member via the supply hole of the bearing retainer on the female rotor side. A part of the oil supplied to the shaft portion of the disk-shaped member is supplied to the suction side bearing and lubricated, and the surplus part falls into the suction side oil chamber 36. That is, the discharge guide part 29, the supply guide part 30, the supply pipe 46, the supply hole of the bearing retainer, and the like described above constitute an introduction flow path for introducing the oil splashed by the splash member 23A into the suction side bearing. ing. The oil that has lubricated the suction-side bearing is led out to the suction-side oil chamber 36 via an oil recovery groove (lead-out passage) (not shown).

  Also in this embodiment, similarly to the first embodiment, a communication pipe 40 that connects the lower part of the discharge side oil chamber 22 and the lower part of the suction side oil chamber 36 is provided. As a result, the oil chamber 22 on the discharge side and the oil chamber 36 on the suction side can share oil, and the oil deterioration rate can be the same. Therefore, maintainability can be improved.

  In the first and second embodiments, the communication pipe 40 as a separate body from the main casing 3 is used as a communication channel that communicates the lower part of the discharge side oil chamber 22 and the lower part of the suction side oil chamber 36. However, the present invention is not limited to this. That is, for example, a communication channel may be formed in the main body casing 3. In the second embodiment, the case where the supply pipe 40 is provided as an example separate from the main body casing 3 has been described as an example. However, the present invention is not limited to this. For example, a supply flow path is formed in the main body casing 3. May be. In these cases, the same effect as described above can be obtained.

It is sectional drawing showing the structure of the screw compressor by one Embodiment of this invention. It is the elements on larger scale of the II section in FIG. It is sectional drawing in the cross section III-III in FIG. It is a perspective view showing the detailed structure of a gear cover. It is a side view showing the structure of a flip-up member. It is sectional drawing in the cross section VI-VI in FIG. It is sectional drawing showing the structure of the screw compressor by the 2nd Embodiment of this invention.

DESCRIPTION OF SYMBOLS 1 Male rotor 2 Casing 3 Main body casing 4 Discharge side casing 6 Gear cover 7 Cover 10 Discharge side bearing 11 Suction side bearing 12 Shaft seal device 13 Shaft seal device 14 Shaft seal device 22 Discharge side oil chamber 23A Bounce member 23B Bounce Raising member 26 Groove (concave)
27 Bounce-up guide (first guide)
29 Discharge guide (second guide)
30 Supply guide (second guide)
33 Bearing retainer supply hole 35 Oil recovery groove 38 Bearing retainer supply hole 39 Oil recovery groove 40 Communication pipe (communication flow path)
41 Oil Level Meter 42 Replenishment Port 43 Discharge Port 46 Supply Pipe (Introduction Channel)

Claims (6)

A casing, a pair of male and female rotors housed in the casing, a bearing disposed on one side and the other side in the axial direction of the rotor, and rotatably supporting the rotor; and between the bearing and the working chamber A screw compressor for driving the working chamber in an oil-free state and lubricating the bearing with oil sealed in the casing;
A first oil chamber formed on one side of the casing in the axial direction of the rotor and storing oil;
A first flip-up member provided on one axial side of the rotor, which rotates together with the rotor and splashes up the oil accumulated in the first oil chamber, and supplies the oil to a bearing on the one axial side;
A second oil chamber formed on the other axial side of the rotor in the casing to store oil;
A second flip-up member provided on the other axial side of the rotor, which rotates together with the rotor and splashes the lubricating oil stored in the second oil chamber, and supplies it to the bearing on the other axial side;
A screw compressor comprising: a communication channel that communicates a lower portion of the first oil chamber and a lower portion of the second oil chamber. A casing, a pair of male and female rotors housed in the casing, a bearing disposed on one side and the other side in the axial direction of the rotor, and rotatably supporting the rotor; and between the bearing and the working chamber A screw compressor for driving the working chamber in an oil-free state and lubricating the bearing with oil sealed in the casing;
A first oil chamber formed on one side of the casing in the axial direction of the rotor and storing oil;
A flip-up member provided on one side in the axial direction of the rotor, which rotates together with the rotor and splashes up the oil stored in the first oil chamber;
A first introduction flow path for introducing a part of the oil bounced up by the bounce-up member into the bearing on the one axial side;
A second introduction flow path for introducing a part of the oil bounced up by the bounce-up member into the bearing on the other axial side;
A second oil chamber that is formed on the other axial side of the rotor in the casing and stores oil that lubricates the bearing on the other axial side;
A screw compressor comprising: a communication channel that communicates a lower portion of the first oil chamber and a lower portion of the second oil chamber.   3. The screw compressor according to claim 1, wherein an oil level gauge indicating an oil amount is provided only in one of the first oil chamber and the second oil chamber, and the first oil chamber and the second oil compressor are provided. A replenishing port for replenishing oil from the outside is provided only in one of the oil chambers, and the oil is discharged to the outside only in one of the first oil chamber and the second oil chamber. A screw compressor characterized in that a discharge port is provided.   The screw compressor according to any one of claims 1 to 3, wherein the flip-up member is a disk-shaped member, and has a plurality of concave portions partitioned in a circumferential direction on an outer peripheral side thereof. Screw compressor to do.   The screw compressor according to claim 4, wherein the screw guide is formed so as to cover an outer peripheral surface of the flip-up member, and is connected to the first guide and holds the oil flowing into the recess of the flip-up member, A screw compressor, comprising: a second guide that guides oil released from a concave portion of the flip-up member toward the bearing by centrifugal force accompanying rotation of the flip-up member.   The screw compressor according to claim 5, wherein the first guide and the second guide are formed integrally with the casing.

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