Claw compressor

Abstract

Provided is a claw compressor capable of preventing seizure of a gear fixed to a rotary shaft that rotates a rotor having a claw part. A claw compressor (1) comprises: a male rotor (24) having a claw part protruding in a radial direction; a first rotary shaft (32) that rotatably supports the male rotor (24); a first gear (39) fixed to the first rotary shaft (32); a female rotor that rotates in an opposite direction to the male rotor (24) and has a recessed part for receiving the claw part; a second rotary shaft that rotatably supports the female rotor; a second gear that is fixed to the second rotary shaft and meshes with the first gear (39); and an oil retention part (21a) that supplies oil to the first gear (39) and the second gear.

Description

Claw compressor

[0001] The present disclosure relates to claw compressors.

[0002] A claw compressor includes a pair of rotors with hook-shaped claws formed inside a housing that defines a compression chamber. The rotors rotate at the same speed in opposite directions without contact while maintaining a predetermined clearance. The two rotors form a compression pocket, and the compressed fluid is discharged from the compression pocket. Such claw compressors are often used primarily as vacuum pumps and blowers (see, for example, Patent Document 1).

[0003] Patent Document 1 discloses a structure in which a plurality of discharge ports are provided so that the temperature inside the cylinder can be kept low under high vacuum conditions when used as a vacuum pump.

[0004] Patent No. 6845596

[0005] In order to rotate a pair of rotors in synchronization with each other, a claw compressor uses a structure in which gears are fixed to the rotating shafts attached to each rotor, and these gears are meshed together to synchronize the rotation.

[0006] However, using gears as described above causes the following problems. When used as a conventional vacuum pump or blower, the working fluid is low temperature, so there is little risk of the gears seizing due to heat transfer through the rotating shaft. In contrast, when used as a steam compressor, the steam becomes hot due to the heat of compression, so there is a higher risk of the gears seizing.

[0007] The present disclosure has been made in consideration of the above circumstances, and aims to provide a claw compressor that can prevent seizure of gears fixed to a rotating shaft that rotates a rotor having claw portions.

[0008] The claw compressor 1 of the present disclosure includes a first rotor provided with radially protruding claw portions, a first rotating shaft that supports the rotation of the first rotor, a first gear fixed to the first rotating shaft, a second rotor that rotates in the opposite direction to the first rotor and has recesses that receive the claw portions, a second rotating shaft that supports the rotation of the second rotor, a second gear fixed to the second rotating shaft and meshing with the first gear, and an oil supply unit that supplies oil to the first gear and the second gear.

[0009] This can prevent the gears from seizing.

[0010] Fig. 1 is a perspective view showing a claw compressor according to a first embodiment of the present disclosure. Fig. 2 is a cross-sectional view of the claw compressor taken along the section line II-II of Fig. 1. Fig. 3 is a cross-sectional view of the claw compressor taken along the section line III-III of Fig. 2. Fig. 4 is a cross-sectional view of the claw compressor taken along the section line IV-IV of Fig. 2. Fig. 5 is a perspective view showing a claw compressor according to a second embodiment of the present disclosure. Fig. 6 is a cross-sectional view of the second embodiment corresponding to Fig. 4. Fig. 7 is a cross-sectional view corresponding to Fig. 6 showing a modified example.

[0011] Hereinafter, multiple embodiments according to the present disclosure will be described with reference to the drawings. [First Embodiment] Hereinafter, a first embodiment of the present disclosure will be described. In the following description, the Z-axis direction indicates the vertical direction. Furthermore, the Y-axis direction is a direction perpendicular to the Z-axis direction and indicates the direction in which the first rotation shaft 32 and the second rotation shaft 42 of the claw compressor 1 extend. Furthermore, the X-axis direction is a direction perpendicular to the Z-axis direction and the Y-axis direction.

[0012] The claw compressor 1 is used to compress steam. As shown in Fig. 1, the claw compressor 1 includes a compression section 3 having a compression chamber 20 (see Fig. 2) formed therein, and a gear section 5 accommodating gears 39 and 49 (see Fig. 2). The compression section 3 is formed by a first housing 7 and a second housing 9, and the gear section 5 is formed by the second housing 9 and a third housing 11. The claw compressor 1 is installed upright on an installation surface using, for example, four legs 12.

[0013] The compression section 3 has an intake port 13 for drawing in steam (fluid) and an outlet port 15 for discharging the steam after compression. The steam is, for example, water vapor. The drawn steam may be under negative pressure or positive pressure.

[0014] 2, the compression unit 3 is configured such that a compression chamber 20 is formed inside by covering a recess formed in the front end (one side end) of the second housing 9 with the first housing 7. The first housing 7 is airtightly attached to the second housing 9 via an O-ring 22.

[0015] The compression chamber 20 is provided with a pair of rotors, namely a male rotor (first rotor) 24 and a female rotor (second rotor) 26 .

[0016] As shown in Fig. 3, the male rotor 24 has a pair of hook-shaped claws 24a. The claws 24a are arranged symmetrically about the first rotation axis O1. The male rotor 24 rotates counterclockwise (in the direction of arrow A1) in Fig. 3.

[0017] The female rotor 26 has a pair of hook-shaped claws 26a. The claws 26a are provided symmetrically about the second rotation axis O2. The female rotor 26 rotates clockwise (in the direction of arrow A2) in FIG. 3 .

[0018] The claws 24a of the male rotor 24 and the claws 26a of the female rotor 26 are adapted to mesh without contacting each other. The female rotor 26 is formed with recesses 26b that receive the claws 24a of the male rotor 24 during the compression stroke. The compressed steam is discharged from the discharge port 15, which is approximately triangular in shape in Figure 3.

[0019] 3, the shape of compression chamber 20 is defined by inner wall 9a of second housing 9, and has a cross-sectional shape formed by partially overlapping two circles, one centered on first rotational axis O1 and the other centered on second rotational axis O2. The tips of claws 24a, 26a of rotors 24, 26 run along inner wall 9a of second housing 9 with a predetermined clearance.

[0020] As shown in Fig. 2, the male rotor 24 is fastened to the first rotating shaft 32 by a first bolt 31. Specifically, as shown in Fig. 2, the first bolt 31 is screwed onto the first rotating shaft 32 with the axis of the first bolt 31 coinciding with the first rotation axis O1. A fastening structure is configured with the center of the male rotor 24 sandwiched between the tip surface of the first rotating shaft 32 and the head of the first bolt 31. The head of the first bolt 31 is housed in a cylindrical recess 24c formed in the center of the male rotor 24.

[0021] The female rotor 26 is fastened to the second rotation shaft 42 by a second bolt 41. Specifically, the second bolt 41 is screwed onto the second rotation shaft 42 with the axis of the second bolt 41 coinciding with the second rotation axis O2. The second rotation shaft 42 is provided parallel to the first rotation shaft 32. In other words, the first rotation axis O1 and the second rotation axis O2 are parallel to each other.

[0022] A fastening structure (second bolt fastening portion) is configured with the center portion of the female rotor 26 sandwiched between the tip surface of the second rotating shaft 42 and the head of the second bolt 41. The head of the second bolt 41 is housed in a cylindrical recess 26c formed in the center of the female rotor 26. Therefore, before the female rotor 26 is fixed by the second bolt 41, relative rotation between the female rotor 26 and the second rotating shaft 42 is permitted.

[0023] The first rotating shaft 32 supporting the male rotor 24 has its tip located within the compression chamber 20 and its rear end connected to a drive unit (not shown). For example, an electric motor is used as the drive unit. The first rotating shaft 32 rotates about the first rotation axis O1, thereby rotating the male rotor 24 within the compression chamber 20. The first rotating shaft 32 is rotatably supported at two locations: a tip bearing (first bearing) 37 and a rear bearing 38. The tip bearing 37 is provided in the second housing 9 and is, for example, a double-row ball bearing. However, the tip bearing 37 is not limited to being a double-row ball bearing or a ball bearing. The rear bearing 38 is located rearward of the tip bearing 37 and is provided in the third housing 11. The rear bearing 38 is a single-row ball bearing, but is not limited to being a single-row ball bearing or a ball bearing.

[0024] A first gear 39 is fixed to the first rotating shaft 32 between a front-end bearing 37 and a rear-end bearing 38. The first gear 39 is, for example, a spur gear, and rotates around the first rotation axis O1 together with the first rotating shaft 32. The first rotating shaft 32 is connected to a second rotating shaft 42 at a gear portion 5.

[0025] The first gear 39 is provided in the gear portion 5 and is housed in a gear chamber 21 formed between the rear end (other side end) of the second housing 9 and the front end of the third housing 11. The second housing 9 and the third housing 11 are attached liquid-tightly via an O-ring 23 so as to seal in the lubricating oil in the gear chamber 21. The interior of the gear chamber 21 (i.e., the interior of the third housing 11) is an oil atmosphere that lubricates the gear portion 5.

[0026] As described above, the tip of the first rotating shaft 32 is provided with a first bolt fastening portion to which the first bolt 31 is fastened. The rear end of the first rotating shaft 32 protrudes from the third housing 11. In other words, the rear end of the first rotating shaft 32 is provided outside the third housing 11. The rear end of the first rotating shaft 32 is connected to a drive unit (such as an electric motor).

[0027] The second rotary shaft 42 that supports the female rotor 26 has its tip located within the compression chamber 20 and its rear end terminated in the third housing 11. A space S is formed in the third housing 11 to accommodate a rear end bearing 48. A seal 35 is provided between the space S and the gear chamber 21.

[0028] The second rotary shaft 42 rotates about the second rotation axis O2, causing the female rotor 26 to rotate within the compression chamber 20. The second rotary shaft 42 is rotatably supported at two locations: a front-end bearing (second bearing) 47 and a rear-end bearing 48. The front-end bearing 47 is provided in the second housing 9 and is, for example, a double-row ball bearing. However, the front-end bearing 47 is not limited to a double-row ball bearing. The rear-end bearing 48 is located rearward of the front-end bearing 47 and is provided outside the third housing 11. Specifically, the rear-end bearing 48 is provided in the space S adjacent to the gear chamber 21. The rear-end bearing 48 is a single-row ball bearing, but is not limited to a single-row ball bearing.

[0029] A second gear 49 is fixed to the second rotating shaft 42 between the front-end bearing 47 and the rear-end bearing 48. The second gear 49 is, for example, a spur gear, and rotates together with the second rotating shaft 42 around the second rotation axis O2.

[0030] The second gear 49 is provided in the gear unit 5 and housed in the gear chamber 21. The second gear 49 is in mesh with the first gear 39, and receives driving force from the first gear 39. Therefore, the first rotating shaft 32 serves as a driving shaft, and the second rotating shaft 42 serves as a driven shaft.

[0031] As described above, the tip of the second rotating shaft 42 is provided with the second bolt fastening portion to which the second bolt 41 is fastened.

[0032] 2 and 4 , an end surface 9b of the second housing 9 and an end surface 11a of the third housing 11 are in surface contact with each other. The mating surface between the second housing 9 and the third housing 11 is located closer to the tip-side bearing 37 than the center of the gear unit 5 in the Y-axis direction (predetermined direction). In this embodiment, the mating surface between the second housing 9 and the third housing 11 is arranged to coincide with the end of the tip-side bearing 37 on the gear unit 5 side.

[0033] A bearing chamber 19 for accommodating the tip end bearings 37 and 47 is formed inside the second housing 9 .

[0034] As shown in Fig. 4, the first rotating shaft 32 passes through the second housing 9. An oil seal 50 and a water seal 52 are provided between the bearing chamber 19 and the compression chamber 20 to seal the gap between the outer circumferential surface of the first rotating shaft 32 and the second housing 9. The oil seal 50 blocks the flow of lubricating oil from the bearing chamber 19 to the compression chamber 20. The water seal 52 blocks the flow of steam and condensed water from the compression chamber 20 to the bearing chamber 19.

[0035] <Gear Cooling Structure> Next, the cooling structure for cooling the gears 39, 49 will be described. An oil reservoir (oil supply section) 21a is provided below the gear chamber 21. Oil OL is stored in the oil reservoir 21a. An oil level OL1 of the oil OL is positioned at a height that immerses the lower ends of the first gear 39 and the second gear 49. As a result, as the gears 39, 49 rotate, the oil OL is splashed up and splashed inside the gear chamber 21, lubricating and cooling the gears 39, 49.

[0036] The claw compressor 1 configured as described above operates as follows: The first rotary shaft 32 is rotationally driven by a drive unit (not shown), causing the male rotor 24 to rotate within the compression chamber 20. The second rotary shaft 42 is rotated by the second gear 49, to which a rotational driving force is transmitted from the first gear 39, which rotates together with the first rotary shaft 32, causing the female rotor 26 to rotate within the compression chamber 20.

[0037] As the male rotor 24 and female rotor 26 rotate within the compression chamber 20, steam is drawn in through the suction port 13. The male rotor 24 rotates counterclockwise (in the direction of arrow A1) in FIG. 3 , taking steam into a compression pocket formed by its claws 24a and moving it downward along the outer periphery of the compression chamber 20. The female rotor 26 rotates clockwise (in the direction of arrow A2) in FIG. 3 , taking steam into a compression pocket formed by its claws 26a and moving it downward along the outer periphery of the compression chamber 20. The compression pocket formed by the male rotor 24 and the compression pocket formed by the female rotor 26 then merge in the center of the lower part of the compression chamber 20, and in this combined compression pocket (compression space), the claws 24a of the male rotor 24 penetrate into the recesses 26b of the female rotor 26, compressing the steam. The compressed steam is discharged to the outside through the discharge port 15.

[0038] This embodiment provides the following advantageous effects. When steam is compressed by the male rotor 24 and the female rotor 26, compression heat is generated. The compression heat, along with frictional heat generated in other sliding parts, is transmitted from the male rotor 24 and the female rotor 26 to the first rotating shaft 32 and the second rotating shaft 42, and then to the first gear 39 and the second gear 49. The first gear 39 and the second gear 49 are supplied with oil OL stored in the oil reservoir 21a. This allows the first gear 39 and the second gear 49 to be cooled by the oil, and the compression heat generated in the male rotor 24 and the female rotor 26 can be removed.

[0039] When the oil OL stored in the oil reservoir 21a is immersed in the lower parts of the first gear 39 and the second gear 49, the oil OL is splashed up by the first gear 39 and the second gear 49 and splashed around the gear chamber 21, thereby lubricating and cooling each gear 39, 49.

[0040] Second Embodiment Next, a second embodiment will be described. This embodiment is similar to the first embodiment except for the method of cooling the gears 39 and 49. Therefore, in the following, the same components as those in the first embodiment will be assigned the same reference numerals and their description will be omitted.

[0041] 5 and 6 , an oil supply hole (oil supply portion) 11b that supplies oil to the gear chamber 21 is formed in the upper part of the third housing 11. Oil is supplied in the direction of arrow A3. The oil supply hole 11b is formed directly above the gap between the first gear 39 and the second gear 49 (e.g., the position where the gears 39 and 49 mesh), and oil supplied from the oil supply hole 11b is supplied to the gap between the first gear 39 and the second gear 49. The position of the oil supply hole 11b is not limited to directly above the gap between the first gear 39 and the second gear 49, and may be located anywhere above the first gear 39 or the second gear 49.

[0042] 6, an oil drain hole (oil drain portion) 11c is formed so as to communicate with the oil reservoir portion 21a below the gear chamber 21. The oil passes through the oil drain hole 11c and is drained to the outside of the gear chamber 21 as shown by arrow A4.

[0043] 5, the second housing 9 is formed with a bearing oil supply hole (bearing oil supply portion) 9c that supplies oil to the bearing chamber 19. As indicated by arrows A5, oil is supplied to each of the tip-side bearings 37, 47 from two locations above. After cooling each of the tip-side bearings 37, 47, the oil is guided to the oil reservoir 21a via a bearing oil drainage passage (not shown).

[0044] The oil drained from the oil reservoir 21a through the oil drain hole 11c preferably passes through an oil cooler (not shown) before being returned to the oil supply hole 11b and the bearing oil supply hole 9c, which allows the oil temperature to be kept low and reduces the amount of oil used.

[0045] The position of the oil level OL1 may be adjusted by controlling an oil circulation pump (not shown) that circulates the oil with a control unit. Specifically, as shown in FIG. 6, the oil level OL1 is positioned below the first gear 39 and the second gear 49 so that the first gear 39 and the second gear 49 are not submerged in the oil OL. For example, the oil level OL1 is controlled so that the amount of oil discharged is greater than the amount of oil supplied to the oil supply hole 11b and the bearing oil supply hole 9c. This prevents the oil level OL1 from coming into contact with the first gear 39 and the second gear 49, thereby reducing oil churning loss.

[0046] The control unit is composed of, for example, a CPU (Central Processing Unit), RAM (Random Access Memory), ROM (Read Only Memory), and a computer-readable storage medium. A series of processes for realizing various functions is stored in a storage medium, for example, in the form of a program. The CPU reads this program into RAM and executes information processing and arithmetic operations to realize various functions. The program may be pre-installed in a ROM or other storage medium, provided in a state stored in a computer-readable storage medium, or distributed via wired or wireless communication means. Examples of computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, and semiconductor memories.

[0047] The effects of this embodiment are as follows. Oil is supplied to the first gear 39 and the second gear 49 from the oil supply hole 11b to cool the gears 39, 49. After cooling the gears 39, 49, the oil flows downward and is stored in the oil reservoir 21a. The oil stored in the oil reservoir 21a is discharged to the outside through the oil drain hole 11c. This makes it possible to suppress oil deterioration by appropriately discharging the oil that has cooled the gears 39, 49. Because the oil supply hole 11b is provided above the gears 39, 49, gravity can be used to smoothly supply oil to the gears 39, 49 located below.

[0048] By controlling the amount of oil supplied from the oil supply hole 11b and the amount of oil discharged from the oil discharge hole 11c, the height of the oil level OL1 of the oil stored in the oil reservoir 21a is set below the first gear 39 and the second gear 49. This reduces the agitation loss caused by the gears 39, 49 agitating the stored oil, and improves the efficiency of the claw compressor 1.

[0049] This embodiment can be modified as shown in Fig. 7. As shown in Fig. 7, a sight glass 54 is provided at a position where the inside of the oil reservoir 21a can be visually confirmed. The oil level OL1 may be detected through the sight glass 54 by a sensor such as a CCD camera, and the height position of the oil level OL1 may be controlled by a control unit.

[0050] If the sight glass 54 is not provided, a capacitance sensor may be provided at the position of the oil level OL1 to detect the height position of the oil level OL1.

[0051] The claw compressors described in the above-described embodiments can be understood, for example, as follows.

[0052] A claw compressor (1) according to a first aspect of the present disclosure includes: a first rotor (24) provided with claw portions (24a) protruding in the radial direction; a first rotating shaft (32) that rotatably supports the first rotor; a first gear (39) fixed to the first rotating shaft; a second rotor (26) that rotates in the opposite direction to the first rotor and has recesses (26b) that receive the claw portions; a second rotating shaft (42) that rotatably supports the second rotor; a second gear (49) fixed to the second rotating shaft and meshing with the first gear; and an oil supply unit (21a, 11b, 11c) that supplies oil to the first gear and the second gear.

[0053] The first and second rotating shafts are driven to rotate synchronously by the meshing first and second gears. The first and second rotating shafts rotate the first and second rotors, and the claws of the first rotor enter the recesses of the second rotor, compressing the fluid. When the fluid is compressed, compression heat is generated. The compression heat, along with frictional heat generated in other sliding parts, is transmitted from the first and second rotors to the first and second rotating shafts and then to the first and second gears. Oil is supplied to the first and second gears by an oil supply unit. This allows the first and second gears to be cooled by the oil, and compression heat generated in the first and second rotors can be removed.

[0054] In the claw compressor according to the second aspect of the present disclosure, in the first aspect, the oil supply section is an oil reservoir (21a) provided below the first gear and the second gear for storing oil, and oil (OL) is stored in the oil reservoir so that the lower parts of the first gear and / or the second gear are immersed.

[0055] The oil stored in the oil reservoir is immersed in the lower part of the first gear and / or the second gear, so that the oil is splashed up by the first gear and / or the second gear and cools each gear.

[0056] In the claw compressor according to the third aspect of the present disclosure, in the first aspect, the oil supply section includes an oil supply section (11b) that supplies oil from above the first gear and the second gear, an oil storage section (21a) that is provided below the first gear and the second gear and that stores oil, and an oil discharge section (11c) that discharges the oil stored in the oil storage section.

[0057] The first gear and the second gear are cooled by supplying oil from the oil supply unit to them. After cooling each gear, the oil flows downward and is stored in the oil reservoir. The oil stored in the oil reservoir is discharged to the outside by the oil drain unit. This allows the oil that has cooled the gears to be appropriately discharged, thereby suppressing oil deterioration. Because the oil supply unit is located above each gear, gravity can be used to smoothly supply oil to each gear located below.

[0058] The claw compressor according to a fourth aspect of the present disclosure is the third aspect, and is provided with a control unit that controls the amount of oil supplied from the oil supply unit and / or the amount of oil discharged from the oil discharge unit so that the oil level (OL1) height of the oil stored in the oil storage unit is below the first gear and the second gear.

[0059] By controlling the amount of oil supplied from the oil supply unit and / or the amount of oil discharged from the oil discharge unit, the oil level of the oil stored in the oil reservoir is set below the first gear and the second gear. This reduces the agitation loss caused by the gears agitating the stored oil, improving the efficiency of the claw compressor. The control unit preferably controls the amount of oil discharged so that it is greater than the amount of oil supplied.

[0060] The claw compressor according to a fifth aspect of the present disclosure is in any one of the first to fourth aspects, further comprising an oil level sensor that detects the level of oil stored in the oil reservoir.

[0061] The oil level can be appropriately controlled by detecting the oil level stored in the oil reservoir using an oil level sensor. The oil level sensor can be a combination of a sight glass installed at the oil level position and a camera that detects the oil level visible through the sight glass, or a capacitance sensor installed at the oil level position.

[0062] A claw compressor according to a sixth aspect of the present disclosure is, in any one of the first to fifth aspects, provided with a first bearing (37) that rotatably supports the first rotating shaft, a second bearing (47) that rotatably supports the second rotating shaft, a bearing oil supply section (9c) that supplies oil to the first bearing and the second bearing, and a bearing oil drain passage that guides the oil that is supplied from the bearing oil supply section and has cooled the first bearing and the second bearing to the oil reservoir.

[0063] The oil that has cooled the first and second bearings is guided to the oil reservoir, which allows the oil to be discharged together with the oil that has cooled the first and second gears.

[0064] DESCRIPTION OF SYMBOLS 1 Claw compressor 3 Compression section 5 Gear section 7 First housing 9 Second housing 9a Inner wall 9b End face 9c Bearing oil supply hole (bearing oil supply section) 11 Third housing 11a End face 11b Oil supply hole (oil supply section) 11c Oil drain hole (oil drain section) 12 Leg section 13 Intake port 15 Discharge port 19 Bearing chamber 20 Compression chamber 21 Gear chamber 21a Oil reservoir section (oil supply section) 22 O-ring 23 O-ring 24 Male rotor 24a Claw section 24c Recess 26 Female rotor 26a Claw section 26b Recess 26c Recess 31 First bolt 32 First rotating shaft 35 Seal section 37 Front end bearing (first bearing) 38 Rear end bearing 39 First gear 41 Second bolt 42 Second rotating shaft 47 Front end bearing (second bearing) 48 Rear end bearing 49 Second gear 50 Oil seal 52 Water seal 54 Sight glass O1 First rotating axis O2 Second rotating axis OL Oil OL1 Oil level

Claims

1. A claw compressor comprising: a first rotor provided with claws protruding in the radial direction; a first rotating shaft that supports the rotation of the first rotor; a first gear fixed to the first rotating shaft; a second rotor that rotates in the opposite direction to the first rotor and has recesses that receive the claws; a second rotating shaft that supports the rotation of the second rotor; a second gear fixed to the second rotating shaft and meshing with the first gear; and an oil supply unit that supplies oil to the first gear and the second gear.

2. A claw compressor as set forth in claim 1, wherein the oil supply section is an oil reservoir section provided below the first gear and the second gear for storing oil, and the oil is stored in the oil reservoir section so that the lower parts of the first gear and / or the second gear are submerged.

3. A claw compressor as described in claim 1, wherein the oil supply section comprises an oil supply section that supplies oil from above the first gear and the second gear, an oil storage section that is provided below the first gear and the second gear and that stores oil, and an oil discharge section that discharges the oil stored in the oil storage section.

4. A claw compressor as described in claim 3, further comprising a control unit that controls the amount of oil supplied from the oil supply unit and / or the amount of oil discharged from the oil discharge unit so that the oil level of the oil stored in the oil storage unit is below the first gear and the second gear.

5. A claw compressor according to claim 2 or 4, further comprising an oil level sensor for detecting the level of oil stored in the oil storage section.

6. A claw compressor according to claim 4, comprising: a first bearing that rotatably supports the first rotating shaft; a second bearing that rotatably supports the second rotating shaft; a bearing oil supply section that supplies oil to the first bearing and the second bearing; and a bearing oil drain passage that guides the oil supplied from the bearing oil supply section and used to cool the first bearing and the second bearing to the oil reservoir.

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