Claw compressor

Abstract

The present invention provides a claw compressor (1) comprising a male rotor (24), a female rotor, and a compression part (3) that forms a compression chamber. The compression part (3) has a main case (9) at one end of which a recess (9A) is formed and a front case (7) that seals the recess (9A). The main case (9) has a first case end surface (9c). The front case (7) has a second case end surface (7a) disposed facing the first case end surface (9c) and a sealing surface (7b) that seals the compression chamber (20). The male rotor (24) has a leading-end surface (24e) disposed facing the sealing surface (7b). The female rotor has a leading-end surface disposed facing the sealing surface (7b). A prescribed distance from the first case end surface (9c) to the sealing surface (7b) is set such that a first leading-end clearance (CL3) from the leading-end surface (24e) of the male rotor (24) to the sealing surface (7b) and a second leading-end clearance from the leading-end surface of the female rotor to the sealing surface (7b) are included in a prescribed leading-end clearance range.

Description

Claw compressor

[0001] The present disclosure relates to claw compressors.

[0002] A claw compressor includes a pair of rotors with hook-shaped claws 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 No. 6845596

[0004] When a steam generation heat pump is used as an alternative to a boiler to compress the generated steam, the pressure difference between the suction pressure and the discharge pressure is larger than in a vacuum pump or blower, resulting in greater leakage, so it is necessary to reduce the gap during the compression process to improve efficiency.However, in the case of claw compressors used as vacuum pumps and blowers, the pressure difference between the suction pressure and the discharge pressure is small, so the issue of reducing the gap during the compression process does not arise, and no sufficient measures have been taken.

[0005] The present disclosure has been made in consideration of these circumstances, and aims to provide a claw compressor that can achieve high compression efficiency by appropriately setting the gap between the first rotor and the second rotor and the members that form the compression chamber.

[0006] In order to solve the above problems, the claw compressor of the present disclosure employs the following measures: A claw compressor according to one aspect of the present disclosure includes a first rotor having a plurality of first claws protruding in a radial direction and rotating about a first rotation axis, a second rotor having a plurality of second claws protruding in the radial direction and rotating about a second rotation axis in a direction opposite to that of the first rotor, and a compression section forming a compression chamber that houses the first rotor and the second rotor, the compression section having a main case having a recess formed at one end that houses the first rotor and the second rotor, and a front case attached to the main case to seal the recess and that forms the compression chamber together with the recess, the main case being arranged on a first plane to surround the first rotor and the second rotor. the front case has a second case end face arranged on a second plane opposite the first case end face so as to surround the first rotor and the second rotor, and a sealing surface arranged to be surrounded by the second case end face and to seal the compression chamber, the first rotor has a first rotor tip face arranged opposite the sealing surface, and the second rotor has a second rotor tip face arranged opposite the sealing surface, and a predetermined distance from the first case end face to the sealing surface is set so that a first tip gap from the first rotor tip face to the sealing surface and a second tip gap from the second rotor tip face to the sealing surface are included in a predetermined tip gap range.

[0007] According to the present disclosure, it is possible to provide a claw compressor that can achieve high compression efficiency by appropriately setting the gaps between the first rotor and the second rotor and the members that form the compression chamber.

[0008] 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 taken along the arrows A-A of the claw compressor shown in FIG. 1. FIG. 3 is a front view of the claw compressor shown in FIG. 1. FIG. 4 is a partially enlarged view showing the vicinity of the male rotor of the claw compressor shown in FIG. 2. FIG. 5 is a partially enlarged view showing the vicinity of the female rotor of the claw compressor shown in FIG. 2. FIG. 6 is a plan view showing a tip clearance adjustment member. FIG. 7 is a plan view of the front case seen from the sealing surface side. FIG. 8 is a partially enlarged view showing the vicinity of the male rotor of the claw compressor according to a second embodiment of the present disclosure. FIG. 9 is a partially enlarged view showing the vicinity of the female rotor of the claw compressor according to the second embodiment of the present disclosure. FIG. 10 is a partially enlarged view showing the vicinity of the male rotor of the claw compressor according to a third embodiment of the present disclosure. FIG. 11 is a partially enlarged view showing the vicinity of the female rotor of the claw compressor according to the third embodiment of the present disclosure. FIG. 12 is a cross-sectional view showing a claw compressor according to a fourth embodiment of the present disclosure. FIG. 13 is a front view showing a claw compressor according to a fifth embodiment of the present disclosure.

[0009] First Embodiment A first embodiment of the present disclosure will now be described with reference to the drawings. Fig. 1 is a perspective view showing a claw compressor 1 according to the first embodiment of the present disclosure. As shown in Fig. 1, the claw compressor 1 includes a compression section 3 that defines a compression chamber therein, and a gear section 5 that houses a timing gear. The compression section 3 is formed by a front case 7 and a main case 9, and the gear section 5 is formed by the main case 9 and a gear case 11. The claw compressor 1 is installed upright on an installation surface using, for example, four legs 12.

[0010] The compression unit 3 has an intake port 13 for drawing in steam (fluid) and an outlet port 15 for discharging the compressed steam. The steam may be, for example, water vapor. The drawn steam may be under negative or positive pressure.

[0011] Figure 2 is a cross-sectional view taken along the line A-A of the claw compressor 1 shown in Figure 1. As shown in Figure 2, the compression unit 3 is configured so that a recess formed in the front end (one side end) of the main case 9 is sealed with the front case 7 to form a compression chamber 20 therein.

[0012] The main case 9 is a housing in which a recess 9A that houses the male rotor (first rotor) 24 and the female rotor (second rotor) 26 is formed at the end on the front case 7 side. The front case 7 is a plate-shaped member that is attached to the main case 9 so as to seal the recess 9A. The front case 7, together with the recess 9A, forms the compression chamber 20 that houses the male rotor 24 and the female rotor 26.

[0013] Figure 3 is a front view of the claw compressor 1 shown in Figure 1. The claw compressor 1 shown in Figure 3 shows a state in which the front case 7 has been removed from the main case 9. As shown in Figure 3, the male rotor 24 has a pair of hook-shaped claw portions (first claw portions) 24a. The claw portions 24a protrude in a radial direction perpendicular to the first rotation axis O1 and are provided symmetrically about the first rotation axis O1. The male rotor 24 rotates counterclockwise (in the direction of arrow A1) in Figure 3.

[0014] The female rotor 26 has a pair of hook-shaped claws (second claws) 26a. The claws 26a protrude in a radial direction perpendicular to the second rotation axis O2 and are symmetrically disposed about the second rotation axis O2. The female rotor 26 rotates clockwise (in the direction of arrow A2) in FIG. 3. The rotation direction of the female rotor 26 is opposite to the rotation direction of the male rotor 24.

[0015] 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 male rotor 24 is formed with recesses (first recesses) 24b that receive the claws 26a of the female rotor 26 during the compression stroke. The female rotor 26 is formed with recesses (second recesses) 26b that receive the claws 24a of the male rotor 24 during the compression stroke. The compressed steam is discharged from a substantially triangular discharge port 15 formed in the front case 7 (not shown).

[0016] 3, the shape of compression chamber 20 is defined by the inner wall 9a of main case 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 main case 9 with a predetermined clearance.

[0017] As shown in Fig. 2, the male rotor 24 is fastened to the first rotating shaft 32 by a first bolt 31. 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.

[0018] The female rotor 26 is fastened to the second rotation shaft 42 by a second bolt 41. 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.

[0019] A fastening structure is configured with the center 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.

[0020] The first rotating shaft 32 that supports the male rotor 24 has its tip located within the compression chamber 20 and its rear end connected to a drive unit (not shown). The drive unit may be, for example, an electric motor. The first rotating shaft 32 rotates about a 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-side bearing 37 and a rear-side bearing 38.

[0021] The front end bearing 37 is provided in the main case 9 and is, for example, a double-row ball bearing. The rear end bearing 38 is located rearward of the front end bearing 37 and is provided in the gear case 11. A first timing gear 39 is fixed to the first rotating shaft 32 between the front end bearing 37 and the rear end bearing 38. The first timing gear 39 is, for example, a spur gear, and rotates together with the first rotating shaft 32 about the first rotation axis O1.

[0022] The first timing gear 39 is provided in the gear unit 5 and is housed in a gear chamber 21 formed between the rear end of the main case 9 and the front end of the gear case 11. The main case 9 and the gear case 11 are attached liquid-tightly via an O-ring 23 so as to seal the lubricating oil in the gear chamber 21.

[0023] The second rotating shaft 42 that supports the female rotor 26 has a front end located within the compression chamber 20 and a rear end that terminates in the gear case 11. The second rotating shaft 42 rotates about a second rotation axis O2, causing the female rotor 26 to rotate within the compression chamber 20. The second rotating shaft 42 is rotatably supported at two locations, a front end bearing 47 and a rear end bearing 48. The front end bearing 47 is provided in the main case 9 and is, for example, a double-row ball bearing. The rear end bearing 48 is located rearward of the front end bearing 47 and is provided in the gear case 11.

[0024] A second timing gear 49 is fixed to the second rotating shaft 42 between the front-end bearing 47 and the rear-end bearing 48. The second timing gear 49 is, for example, a spur gear, and rotates together with the second rotating shaft 42 about the second rotation axis O2. The second timing gear 49 is provided in the gear unit 5 and housed in the gear chamber 21. The second timing gear 49 meshes with the first timing gear 39, and receives driving force from the first timing gear 39. Therefore, the first rotating shaft 32 serves as a drive shaft, and the second rotating shaft 42 serves as a driven shaft.

[0025] 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 timing gear 49, to which a rotational driving force is transmitted from the first timing gear 39, which rotates together with the first rotary shaft 32, causing the female rotor 26 to rotate within the compression chamber 20.

[0026] 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 Figure 3 (in the direction of arrow A1), taking in steam into the compression pockets formed by the claws 24a and moving it downward along the outer periphery of the compression chamber 20. The female rotor 26 rotates clockwise in Figure 3 (in the direction of arrow A2), taking in steam into the compression pockets formed by the claws 26a and moving it downward along the outer periphery of the compression chamber 20.

[0027] The compression pocket formed by the male rotor 24 and the compression pocket formed by the female rotor 26 then join together in the center of the lower part of the compression chamber 20, and in this combined compression pocket, the claws 24a of the male rotor 24 enter the recesses 26b of the female rotor 26 to compress the steam. The compressed steam is discharged to the outside from the discharge port 15.

[0028] Next, a structure for appropriately setting the gaps between the first rotor and the second rotor and the members forming the compression chambers will be described with reference to the drawings. Fig. 4 is a partially enlarged view showing the vicinity of the male rotor 24 of the claw compressor 1 shown in Fig. 2. Fig. 5 is a partially enlarged view showing the vicinity of the female rotor 26 of the claw compressor 1 shown in Fig. 2. Fig. 6 is a plan view showing the tip gap adjustment member 8. Fig. 7 is a plan view of the front case 7 as seen from the sealing surface 7b side.

[0029] As shown in Figures 3 and 4, the main case 9 has a first case end surface 9c that is disposed on a first plane PL1 that is perpendicular to the first rotation axis O1 so as to surround the male rotor 24 and the female rotor 26.

[0030] 4 and 6 , the front case 7 has a second case end face 7a that faces the first case end face 9c and is positioned on a second plane PL2 that is perpendicular to the first rotation axis O1 so as to surround the male rotor 24 and the female rotor 26, and a sealing surface 7b that is surrounded by the second case end face 7a and seals the compression chamber. The second case end face 7a is an annular area outside an imaginary line 9a1 that corresponds to the position where the inner wall 9a of the main case 9 is located. The sealing surface 7b is an area inside the imaginary line 9a1.

[0031] As shown in Figure 4, the male rotor 24 has a bottom surface (first rotor bottom surface) 24d that is arranged opposite the bottom surface portion 9b that is arranged in the recess 9A of the main case 9, and a tip surface (first rotor tip surface) 24e that is arranged opposite the sealing surface 7b of the front case 7.

[0032] As shown in FIG. 5, the female rotor 26 has a bottom surface (second rotor bottom surface) 26d that is arranged opposite the bottom surface portion 9b that is arranged in the recess 9A of the main case 9, and a tip surface (second rotor tip surface) 26e that is arranged opposite the sealing surface 7b of the front case 7.

[0033] 4 and 5 , the claw compressor 1 of this embodiment includes a first bottom clearance adjustment member 4, a second bottom clearance adjustment member 6, and a tip clearance adjustment member 8. The male rotor 24 is attached to the first rotating shaft 32 with the first bottom clearance adjustment member 4 sandwiched between the male rotor 24 and a first axial end surface 32a of the first rotating shaft 32. The female rotor 26 is attached to the second rotating shaft 42 with the second bottom clearance adjustment member 6 sandwiched between the female rotor 26 and a second axial end surface 42a of the second rotating shaft 42.

[0034] The thickness t1 of the first bottom gap adjustment member 4 is set so that the length of the first bottom gap CL1 from the bottom surface 24d to the bottom surface portion 9b along the first rotation axis O1 falls within a predetermined bottom gap range. Similarly, the thickness t2 of the second bottom gap adjustment member 6 is set so that the second bottom gap CL2 from the bottom surface 26d to the bottom surface portion 9b falls within a predetermined bottom gap range. Here, the predetermined bottom gap range is, for example, a range of 0.05 mm or more and 0.3 mm or less.

[0035] An operator assembling the claw compressor 1 of this embodiment selects from the plurality of first bottom clearance adjustment members 4 a first bottom clearance adjustment member 4 having a thickness t1 set so that the length of the first bottom clearance CL1 along the first rotation axis O1 falls within a predetermined bottom clearance range, and uses this first bottom clearance adjustment member 4 in assembling the claw compressor 1 of this embodiment. Similarly, an operator selects from the plurality of second bottom clearance adjustment members 6 a second bottom clearance adjustment member 6 having a thickness t2 set so that the length of the second bottom clearance CL2 along the second rotation axis O2 falls within a predetermined bottom clearance range, and uses this second bottom clearance adjustment member 6 in assembling the claw compressor 1 of this embodiment.

[0036] The tip gap adjustment member 8 is a plate-shaped member that is disposed in contact with both the first case end surface 9 c and the second case end surface 7 a when the main case 9 and the front case 7 are connected by the connecting member 50. As shown in Figure 6, the tip gap adjustment member 8 is an annular member.

[0037] The thickness t3 of the tip clearance adjustment member 8 is set so that the length along the first rotation axis O1 of the first tip clearance CL3 from the tip surface 24e of the male rotor 24 to the sealing surface 7b of the front case 7 falls within a predetermined tip clearance range. Similarly, the length along the second rotation axis O2 of the second tip clearance CL4 from the tip surface 26e of the female rotor 26 to the sealing surface 7b of the front case 7 falls within the predetermined tip clearance range. Here, the predetermined tip clearance range is, for example, a range of 0.15 mm or more and 0.35 mm or less.

[0038] The thickness t3 of the tip gap adjustment member 8 is equal to the distance from the first case end face 9c of the main case 9 to the sealing surface 7b of the front case 7. In this embodiment, the predetermined distance from the first case end face 9c of the main case 9 to the sealing surface 7b of the front case 7 is set so that the first tip gap CL3 and the second tip gap CL4 are included in a predetermined tip gap range.

[0039] The worker assembling the claw compressor 1 of this embodiment selects from the plurality of tip gap adjustment members 8 a tip gap adjustment member 8 having a thickness t3 set so that the length of the first tip gap CL3 along the first axis of rotation O1 and the length of the second tip gap CL4 along the second axis of rotation O2 are within a predetermined tip gap range, and uses this tip gap adjustment member 8 to assemble the claw compressor 1 of this embodiment.

[0040] The following describes the actions and effects of the claw compressor 1 of this embodiment described above. According to the claw compressor 1 of this embodiment, in the compression chamber 20 accommodating the male rotor 24 and the female rotor 26, the male rotor 24 rotates about the first rotation axis 32, and the female rotor 26 rotates about the second rotation axis 42 in the opposite direction to the male rotor 24, compressing steam through the meshing of the claws 24a and 26a. The male rotor 24 and the female rotor 26 are accommodated in the recess 9A of the main case 9, and are sealed in the compression chamber 20 by the sealing surface 7b of the front case 7 with the first case end surface 9c of the main case 9 facing the second case end surface 7a of the front case 7.

[0041] According to the claw compressor 1 of this embodiment, the predetermined distance from the first case end face 9c to the sealing surface 7b is set so that the first tip clearance CL3 from the tip surface 24e to the sealing surface 7b and the second tip clearance CL4 from the tip surface 26e to the sealing surface 7b fall within a predetermined tip clearance range. This prevents a decrease in compression efficiency due to the first tip clearance CL3 and the second tip clearance CL4 being larger than the predetermined tip clearance range. Furthermore, it prevents contact between components due to the first tip clearance CL3 and the second tip clearance CL4 being smaller than the predetermined tip clearance range. Thus, according to the claw compressor 1 of this embodiment, the clearances between the male rotor 24 and the female rotor 26 and the components forming the compression chamber 20 can be appropriately set to achieve high compression efficiency.

[0042] According to the claw compressor 1 of this embodiment, by adjusting the thickness of the tip gap adjustment member 8, which is arranged in contact with both the first case end face 9c and the second case end face 7a, it is possible to prevent a decrease in compression efficiency due to the first tip gap CL3 and the second tip gap CL4 becoming larger than the specified tip gap range, and to prevent contact between parts due to the first tip gap CL3 and the second tip gap CL4 becoming smaller than the specified tip gap range.

[0043] According to the claw compressor 1 of this embodiment, by adjusting the thickness of the first bottom clearance adjustment member 4, it is possible to prevent a decrease in compression efficiency caused by the first bottom clearance CL1 from the bottom surface 24d of the male rotor 24 to the bottom portion 9b becoming larger than a predetermined bottom clearance range, or to prevent contact between components caused by the first bottom clearance CL1 becoming smaller. Furthermore, by adjusting the thickness of the second bottom clearance adjustment member 6, it is possible to prevent a decrease in compression efficiency caused by the second bottom clearance CL2 from the bottom surface 26d of the female rotor 26 to the bottom portion 9b becoming larger than a predetermined bottom clearance range, or to prevent contact between components caused by the second bottom clearance CL2 becoming smaller.

[0044] Second Embodiment Next, a claw compressor 1A according to a second embodiment of the present disclosure will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is similar to the first embodiment except where specifically described below, and therefore, description thereof will be omitted.

[0045] In the claw compressor 1 of the first embodiment, the first tip clearance CL3 and the second tip clearance CL4 are set to fall within a predetermined tip clearance range by adjusting the thickness of the tip clearance adjustment member 8 that is disposed in contact with both the first case end face 9 c and the second case end face 7 a. In contrast, in the claw compressor 1A of the present embodiment, the first tip clearance CL3 and the second tip clearance CL4 are set to fall within a predetermined tip clearance range by adjusting the distance from the second case end face 7 a to the sealing surface 7 b.

[0046] Fig. 8 is a partial enlarged view showing the vicinity of the male rotor 24 of the claw compressor 1A according to the second embodiment of the present disclosure. Fig. 9 is a partial enlarged view showing the vicinity of the female rotor 26 of the claw compressor 1A according to the second embodiment of the present disclosure.

[0047] 8, in this embodiment, the first case end surface 9c of the main case 9 and the second case end surface 7a of the front case 7 are disposed in direct contact with each other, with no other components sandwiched between them. The sealing surface 7b is disposed at a position farther away from the tip surface 24e of the male rotor 24 than the second case end surface 7a. The distance L1 from the second case end surface 7a to the sealing surface 7b is set so that a first tip clearance CL3 from the tip surface 24e of the male rotor 24 to the sealing surface 7b of the front case 7 falls within a predetermined tip clearance range.

[0048] 9, the sealing surface 7b is located farther away from the tip end surface 26e of the female rotor 26 than the second case end surface 7a. The distance L2 from the second case end surface 7a to the sealing surface 7b is set so that a second tip clearance CL4 from the tip end surface 26e of the female rotor 26 to the sealing surface 7b of the front case 7 falls within a predetermined tip clearance range. Here, the predetermined tip clearance range is, for example, not less than 0.15 mm and not more than 0.35 mm.

[0049] The worker assembling the claw compressor 1A of this embodiment selects from the plurality of front cases 7 a front case 7 having a distance L1 set so that the length of the first tip clearance CL3 along the first rotation axis O1 falls within a predetermined tip clearance range, and uses the selected front case 7 for assembling the claw compressor 1A of this embodiment. Alternatively, the worker processes the front case 7 to adjust the distance L1 so that the length of the first tip clearance CL3 along the first rotation axis O1 falls within the predetermined tip clearance range, and uses the selected front case 7 for assembling the claw compressor 1A of this embodiment.

[0050] Similarly, the worker assembling the claw compressor 1A of this embodiment selects from the plurality of front cases 7 a front case 7 having the distance L2 set so that the length of the second tip clearance CL4 along the second rotation axis O2 falls within a predetermined tip clearance range, and uses this front case 7 for assembling the claw compressor 1A of this embodiment. Alternatively, the worker processes the front case 7 to adjust the distance L2 so that the length of the second tip clearance CL4 along the second rotation axis O2 falls within the predetermined tip clearance range, and uses this front case 7 for assembling the claw compressor 1A of this embodiment.

[0051] According to the claw compressor 1A of this embodiment, by adjusting the distances L1, L2 from the second case end face 7a to the sealing surface 7b, which is positioned farther from the tip face 24e of the male rotor 24 and the tip face 26e of the female rotor 26 than the second case end face 7a, it is possible to prevent a decrease in compression efficiency due to the first tip gap CL3 and the second tip gap CL4 becoming larger than a predetermined tip gap range, and to prevent contact between parts due to the first tip gap CL3 and the second tip gap CL4 becoming smaller than a predetermined tip gap range.

[0052] Third Embodiment Next, a claw compressor 1B according to a third embodiment of the present disclosure will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is similar to the first embodiment except where specifically described below, and therefore, description thereof will be omitted below.

[0053] In the claw compressor 1 of the first embodiment, the first tip clearance CL3 and the second tip clearance CL4 are set to fall within a predetermined tip clearance range by adjusting the thickness of the tip clearance adjustment member 8 that is disposed in contact with both the first case end face 9 c and the second case end face 7 a. In contrast, in the claw compressor 1B of the present embodiment, the first tip clearance CL3 and the second tip clearance CL4 are set to fall within a predetermined tip clearance range by adjusting the distance from the second case end face 7 a to the sealing surface 7 b.

[0054] Fig. 10 is a partial enlarged view showing the vicinity of the male rotor 24 of the claw compressor 1B according to the third embodiment of the present disclosure. Fig. 11 is a partial enlarged view showing the vicinity of the female rotor 26 of the claw compressor 1B according to the third embodiment of the present disclosure.

[0055] 10 , in this embodiment, the first case end surface 9c of the main case 9 and the second case end surface 7a of the front case 7 are disposed in direct contact with each other, with no other components sandwiched between them. The sealing surface 7b is disposed closer to the tip surface 24e of the male rotor 24 than the second case end surface 7a. The distance L3 from the second case end surface 7a to the sealing surface 7b is set so that the first tip clearance CL3 from the tip surface 24e of the male rotor 24 to the sealing surface 7b of the front case 7 falls within a predetermined tip clearance range.

[0056] 11 , the sealing surface 7b is located closer to the tip end surface 26e of the female rotor 26 than the second case end surface 7a. The distance L2 from the second case end surface 7a to the sealing surface 7b is set so that a second tip clearance CL4 from the tip end surface 26e of the female rotor 26 to the sealing surface 7b of the front case 7 falls within a predetermined tip clearance range. Here, the predetermined tip clearance range is, for example, not less than 0.15 mm and not more than 0.35 mm.

[0057] The worker assembling the claw compressor 1B of this embodiment selects from the plurality of front cases 7 a front case 7 having a distance L3 set so that the length of the first tip clearance CL3 along the first rotation axis O1 falls within a predetermined tip clearance range, and uses the selected front case 7 for assembling the claw compressor 1B of this embodiment. Alternatively, the worker processes the front case 7 to adjust the distance L3 so that the length of the first tip clearance CL3 along the first rotation axis O1 falls within the predetermined tip clearance range, and uses the selected front case 7 for assembling the claw compressor 1B of this embodiment.

[0058] Similarly, the worker assembling the claw compressor 1B of this embodiment selects from the plurality of front cases 7 a front case 7 having a distance L4 set so that the length of the second tip clearance CL4 along the second rotation axis O2 falls within a predetermined tip clearance range, and uses this front case 7 for assembling the claw compressor 1B of this embodiment. Alternatively, the worker processes the front case 7 to adjust the distance L4 so that the length of the second tip clearance CL4 along the second rotation axis O2 falls within the predetermined tip clearance range, and uses this front case 7 for assembling the claw compressor 1B of this embodiment.

[0059] According to the claw compressor 1B of this embodiment, by adjusting the distances L3, L4 from the second case end face 7a to the sealing surface 7b, which is positioned closer to the tip face 24e of the male rotor 24 and the tip face 26e of the female rotor 26 than to the second case end face 7a, it is possible to prevent a decrease in compression efficiency due to the first tip clearance CL3 and the second tip clearance CL4 becoming larger than a predetermined tip clearance range, and to prevent contact between parts due to the first tip clearance CL3 and the second tip clearance CL4 becoming smaller than a predetermined tip clearance range.

[0060] Fourth Embodiment Next, a claw compressor 1C according to a fourth embodiment of the present disclosure will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is similar to the first embodiment except where specifically described below, and therefore, description thereof will be omitted.

[0061] In the claw compressor 1 of the first embodiment, the first tip clearance CL3 and the second tip clearance CL4 are set to fall within a predetermined tip clearance range by adjusting the thickness of the tip clearance adjustment member 8 that is disposed in contact with both the first case end face 9 c and the second case end face 7 a. In contrast, in the claw compressor 1C of the present embodiment, the first side clearance CL5 between the side face (first side face) 24 f of the male rotor 24 and the cylinder portion 9 e arranged to surround it and the second side clearance CL6 between the side face (second side face) 26 f of the female rotor 26 and the cylinder portion 9 e arranged to surround it are set to fall within a predetermined side clearance range by adjusting the thickness t4 of the first side clearance adjustment member 9 e3 and the thickness t5 of the second side clearance adjustment member 9 e4.

[0062] Fig. 12 is a cross-sectional view showing a claw compressor 1C according to a fourth embodiment of the present disclosure. Fig. 13 is a front view showing the claw compressor 1C according to the fourth embodiment of the present disclosure. As shown in Fig. 12, the main case 9 included in the claw compressor 1C of this embodiment is divided into a main body portion 9d and a cylinder portion 9e.

[0063] The main body portion 9d has a bottom portion 9b that forms the bottom surface of the recess 9A. The cylinder portion 9e is disposed so as to surround a side surface 24f of the male rotor 24 about the first rotation axis O1 and a side surface 26f of the female rotor 26 about the second rotation axis O2. As shown in Figure 13, the cylinder portion 9e has a first cylinder case 9e1, a second cylinder case 9e2, a first side surface gap adjustment member 9e3, and a second side surface gap adjustment member 9e4.

[0064] The second cylinder case 9e2 indicated by the dotted line in Fig. 13 shows a state in which the first cylinder case 9e1, the second cylinder case 9e2, the first side gap adjustment member 9e3, and the second side gap adjustment member 9e4 are disconnected. As shown in Fig. 13, the first cylinder case 9e1 and the second cylinder case 9e2 are divided into an upper first cylinder case 9e1 and a lower second cylinder case 9e2 in the vertical direction VD. The first cylinder case 9e1 and the second cylinder case 9e2 are connected by a connector (not shown) with the first side gap adjustment member 9e3 and the second side gap adjustment member 9e4 sandwiched between them in the vertical direction VD.

[0065] The first cylinder case 9e1 and the second cylinder case 9e2 are connected at a first opposing position P1 where they face each other on the male rotor 24 side, with a first side clearance adjustment member 9e3 sandwiched between them. The first cylinder case 9e1 and the second cylinder case 9e2 are connected at a second opposing position P2 where they face each other on the female rotor 26 side, with a second side clearance adjustment member 9e4 sandwiched between them.

[0066] The first cylinder case 9e1 is a housing formed with an intake port 13 for drawing steam into the compression chamber 20. The second cylinder case 9e2 is a housing that, together with the first cylinder case 9e1, forms the compression chamber 20. The first side clearance adjustment member 9e3 is a plate-shaped member that adjusts a first radial side clearance CL5 between the second cylinder case 9e2 and the side surfaces 24f of the claw portions 24a of the male rotor 24. Similarly, the second side clearance adjustment member 9e4 is a plate-shaped member that adjusts a second radial side clearance CL6 between the second cylinder case 9e2 and the side surfaces 26f of the claw portions 26a of the female rotor 26.

[0067] The thickness t4 of the first side gap adjustment member 9e3 and the thickness t5 of the second side gap adjustment member 9e4 are set so that both the first side gap CL5 and the second side gap CL6 fall within a predetermined side gap range. The thicknesses t4 and t5 are set so that the smaller of the first side gap CL5 and the second side gap CL6 exceeds the lower limit of the predetermined side gap range. Here, the predetermined side gap range is, for example, 0.1 mm or more and 0.3 mm or less.

[0068] According to the claw compressor 1C of this embodiment, the cylinder portion 9e, which is arranged to surround the side surface 24f of the male rotor 24 and the side surface 26f of the female rotor 26, is divided into a first cylinder case 9e1 in which the intake port 13 is formed, and a second cylinder case 9e2 which forms the compression chamber 20 together with the first cylinder case 9e1.

[0069] The first side clearance adjustment member 9e3 is sandwiched between the first cylinder case 9e1 and the second cylinder case 9e2, and its thickness t4 is set so that the first side clearance CL5 and the second side clearance CL6 fall within a predetermined side clearance range. Similarly, the second side clearance adjustment member 9e4 is sandwiched between the first cylinder case 9e1 and the second cylinder case 9e2, and its thickness t5 is set so that the first side clearance CL5 and the second side clearance CL6 fall within a predetermined side clearance range.

[0070] This prevents a decrease in compression efficiency due to at least one of the first side surface gap CL5 and the second side surface gap CL6 becoming larger than the predetermined side surface gap range, and also prevents contact between components due to at least one of the first side surface gap CL5 and the second side surface gap CL6 becoming smaller than the predetermined side surface gap range.

[0071] Fifth Embodiment Next, a claw compressor 1D according to a fifth embodiment of the present disclosure will be described with reference to the drawings. This embodiment is a modification of the first embodiment, and is similar to the first embodiment except where specifically described below, and therefore, description thereof will be omitted below.

[0072] In the claw compressor 1 of the first embodiment, the first tip clearance CL3 and the second tip clearance CL4 are set within a predetermined tip clearance range by adjusting the thickness of the tip clearance adjustment member 8, which is disposed in contact with both the first case end face 9c and the second case end face 7a. In contrast, in the claw compressor 1D of this embodiment, the first side clearance CL5 between the side face (first side face) 24f of the male rotor 24 and the cylinder portion 9e arranged to surround it is set within a predetermined side clearance range by adjusting the thickness t4 of the first side clearance adjustment member 9e3. Also, the second side clearance CL6 between the side face (first side face) 24f of the male rotor 24 and the cylinder portion 9e arranged to surround it is set within a predetermined side clearance range by adjusting the thickness t5 of the second side clearance adjustment member 9e4.

[0073] Fig. 14 is a front view showing a claw compressor 1D according to a fifth embodiment of the present disclosure. As shown in Fig. 14, the main case 9 included in the claw compressor 1D of this embodiment has a cylinder portion 9e. The cylinder portion 9e is arranged to surround a side surface 24f of the male rotor 24 about the first rotational axis O1 and a side surface 26f of the female rotor 26 about the second rotational axis O2. The cylinder portion 9e has a first cylinder case 9e1, a second cylinder case 9e5, a third cylinder case 9e6, a first side surface gap adjustment member 9e3, and a second side surface gap adjustment member 9e4.

[0074] The second cylinder case 9e5 shown by dotted lines in Fig. 14 indicates a state in which the first cylinder case 9e1, the second cylinder case 9e2, and the first side gap adjustment member 9e3 are disconnected from each other. The third cylinder case 9e6 shown by dotted lines in Fig. 14 indicates a state in which the first cylinder case 9e1, the third cylinder case 9e6, and the second side gap adjustment member 9e4 are disconnected from each other.

[0075] 14 , the first cylinder case 9e1, the second cylinder case 9e5, and the third cylinder case 9e6 are divided into a central first cylinder case 9e1, a left second cylinder case 9e5, and a right third cylinder case 9e6 in a horizontal direction HD perpendicular to the vertical direction VD. The first cylinder case 9e1 and the second cylinder case 9e5 are connected by a connector (not shown) with the first side gap adjustment member 9e3 sandwiched between them along the horizontal direction HD. The first cylinder case 9e1 and the third cylinder case 9e6 are connected by a connector (not shown) with the second side gap adjustment member 9e4 sandwiched between them along the horizontal direction HD.

[0076] The first cylinder case 9e1 and the second cylinder case 9e5 are connected at a pair of first opposing positions P1 on the male rotor 24 side, with the first side clearance adjustment member 9e3 sandwiched between them. The first cylinder case 9e1 and the third cylinder case 9e6 are connected at a pair of second opposing positions P2 on the female rotor 26 side, with the second side clearance adjustment member 9e4 sandwiched between them.

[0077] The first cylinder case 9e1 is a housing formed with an intake port 13 that draws steam into the compression chamber 20. The second cylinder case 9e5 and the third cylinder case 9e6 are housings that, together with the first cylinder case 9e1, form the compression chamber 20. The first side clearance adjustment member 9e3 is a plate-shaped member that adjusts a first radial side clearance CL5 between the claws 24a of the male rotor 24 and the second cylinder case 9e5. Similarly, the second side clearance adjustment member 9e4 is a plate-shaped member that adjusts a second radial side clearance CL6 between the claws 26a of the female rotor 26 and the third cylinder case 9e6.

[0078] The thickness t4 of the first side gap adjustment member 9e3 is set so that the first side gap CL5 falls within a predetermined side gap range. Similarly, the thickness t5 of the second side gap adjustment member 9e4 is set so that the second side gap CL6 falls within a predetermined side gap range. Here, the predetermined side gap range is, for example, 0.1 mm or more and 0.3 mm or less.

[0079] In the claw compressor 1D of this embodiment, the second side clearance adjustment member is sandwiched between the first cylinder case and the third cylinder case, and its thickness is set so that the second side clearance falls within a predetermined side clearance range. This prevents a decrease in compression efficiency due to the second side clearance being larger than the predetermined side clearance range. Furthermore, it also prevents contact between components due to the second side clearance being smaller than the predetermined side clearance range.

[0080] The claw compressor according to each of the above-described embodiments can be understood as follows, for example: A claw compressor according to a first aspect of the present disclosure includes a first rotor (24) having a plurality of first claws protruding in the radial direction and rotating around a first rotation axis (32), a second rotor (26) having a plurality of second claws protruding in the radial direction and rotating around a second rotation axis (42) in the opposite direction to the first rotor, and a compression section (3) forming a compression chamber accommodating the first rotor and the second rotor, the compression section including a main case (9) having a recess (9A) formed at one end for accommodating the first rotor and the second rotor, and a front case (7) attached to the main case so as to seal the recess and forming the compression chamber together with the recess, the main case being disposed on a first plane (PL1) so as to surround the first rotor and the second rotor. The front case has a first case end face (9c) on which the compression chamber is placed, the front case has a second case end face (7a) that is arranged on a second plane (PL2) opposite the first case end face so as to surround the first rotor and the second rotor, and a sealing surface (7b) that is arranged to be surrounded by the second case end face and seals the compression chamber, the first rotor has a first rotor tip face (24e) that is arranged opposite the sealing surface, and the second rotor has a second rotor tip face (26e) that is arranged opposite the sealing surface, and a predetermined distance from the first case end face to the sealing surface is set so that a first tip clearance (CL1) from the first rotor tip face to the sealing surface and a second tip clearance (CL2) from the second rotor tip face to the sealing surface are included in a predetermined tip clearance range.

[0081] According to the claw compressor of the first aspect of the present disclosure, in a compression chamber housing the first rotor and the second rotor, the first rotor rotates about a first rotation axis, the second rotor rotates about a second rotation axis in the opposite direction to the first rotor, and fluid is compressed by meshing of the first claws with the second claws. The first rotor and the second rotor are housed in recesses in the main case, and are sealed in the compression chamber by a sealing surface of the front case with the first case end face of the main case facing the second case end face of the front case.

[0082] According to the claw compressor of the first aspect of the present disclosure, the predetermined distance from the first case end face to the sealing surface is set so that the first tip gap from the first rotor tip face to the sealing surface and the second tip gap from the second rotor tip face to the sealing surface are within a predetermined tip gap range. This prevents a decrease in compression efficiency due to the first tip gap and the second tip gap being larger than the predetermined tip gap range. Furthermore, it prevents contact between components due to the first tip gap and the second tip gap being smaller than the predetermined tip gap range. Thus, according to the claw compressor of the first aspect of the present disclosure, high compression efficiency can be achieved by appropriately setting the gaps between the first rotor and the second rotor and the members that form the compression chambers.

[0083] The claw compressor according to a second aspect of the present disclosure is the first aspect, and further includes the following configuration: a plate-shaped tip gap adjustment member (8) that is disposed in contact with both the first case end face and the second case end face, and the thickness of the tip gap adjustment member is set so that the first tip gap and the second tip gap are within the predetermined tip gap range.

[0084] According to the claw compressor of the second aspect of the present disclosure, by adjusting the thickness of the tip gap adjustment member that is arranged in contact with both the first case end face and the second case end face, it is possible to prevent a decrease in compression efficiency caused by the first tip gap and the second tip gap becoming larger than a predetermined tip gap range, and to prevent contact between parts caused by the first tip gap and the second tip gap becoming smaller than a predetermined tip gap range.

[0085] A claw compressor according to a third aspect of the present disclosure is the first aspect, further including the following configuration: the sealing surface is disposed at a position farther away from the first rotor tip surface and the second rotor tip surface than the second case end surface, and the distance from the second case end surface to the sealing surface is set so that the first tip gap and the second tip gap are within the predetermined tip gap range.

[0086] According to the claw compressor of the third aspect of the present disclosure, by adjusting the distance from the second case end face to the sealing surface that is positioned farther from the first rotor tip face and the second rotor tip face than the second case end face, it is possible to prevent a decrease in compression efficiency caused by the first tip gap and the second tip gap becoming larger than a predetermined tip gap range, and to prevent contact between parts caused by the first tip gap and the second tip gap becoming smaller than a predetermined tip gap range.

[0087] A claw compressor according to a fourth aspect of the present disclosure is the first aspect, further including the following configuration: the sealing surface is disposed at a position closer to the first rotor tip surface and the second rotor tip surface than the second case end surface, and the distance from the second case end surface to the sealing surface is set so that the first tip gap and the second tip gap are within the predetermined tip gap range.

[0088] According to the claw compressor of the fourth aspect of the present disclosure, by adjusting the distance from the second case end face to the sealing surface that is positioned closer to the first rotor tip face and the second rotor tip face than the second case end face, it is possible to prevent a decrease in compression efficiency caused by the first tip gap and the second tip gap becoming larger than a predetermined tip gap range, and to prevent contact between parts caused by the first tip gap and the second tip gap becoming smaller.

[0089] A claw compressor according to a fifth aspect of the present disclosure is any one of the first to fourth aspects, further including the following configuration: the first rotor is attached to the first rotating shaft with a first bottom gap adjustment member (4) sandwiched between the first rotor and a first shaft tip surface (32a) of the first rotating shaft, and has a first rotor bottom surface (24d) arranged opposite a bottom surface portion (9b) arranged in the recess of the main case, the second rotor is attached to the second rotating shaft with a second bottom gap adjustment member (6) sandwiched between the second rotor and a second shaft tip surface (42a) of the second rotating shaft, and has a second rotor bottom surface (26d) arranged opposite the bottom surface portion, the thickness of the first bottom gap adjustment member being set so that a first bottom gap from the first rotor bottom surface to the bottom surface portion is within a predetermined bottom gap range, and the thickness of the second bottom gap adjustment member being set so that a second bottom gap from the second rotor bottom surface to the bottom surface portion is within the predetermined bottom gap range.

[0090] According to the claw compressor of the fifth aspect of the present disclosure, by adjusting the thickness of the first bottom gap adjustment member, it is possible to prevent a decrease in compression efficiency caused by the first bottom gap from the bottom surface of the first rotor to the bottom portion becoming larger than a predetermined bottom gap range, or contact between components caused by the first bottom gap becoming smaller. Also, by adjusting the thickness of the second bottom gap adjustment member, it is possible to prevent a decrease in compression efficiency caused by the second bottom gap from the bottom surface of the second rotor to the bottom portion becoming larger than a predetermined bottom gap range, or contact between components caused by the second bottom gap becoming smaller.

[0091] A claw compressor according to a sixth aspect of the present disclosure includes a first rotor having a plurality of first claws protruding in a radial direction and rotating about a first rotation axis, a second rotor having a plurality of second claws protruding in the radial direction and rotating about a second rotation axis in a direction opposite to that of the first rotor, and a compression section forming a compression chamber accommodating the first rotor and the second rotor, the compression section having a main case having a recess formed at one end thereof for accommodating the first rotor and the second rotor, and a front case attached to the main case so as to seal the recess and forming the compression chamber together with the recess, the main case having a first side surface (24e) about a first axis line along the first rotation axis of the first rotor and a second side surface (24f) about the second rotation axis of the second rotor and a bottom surface portion (9b) that forms the bottom surface of the recess, wherein the cylinder portion has a first cylinder case (9e1) that has an intake port (13) formed therein for drawing fluid into the compression chamber, a second cylinder case (9e2) that forms the compression chamber together with the first cylinder case, and a first side surface gap adjustment member (9e3) that adjusts the first side surface gap (CL5) in the radial direction between the first rotor and the second cylinder case, wherein the first cylinder case and the second cylinder case are connected with the first side surface gap adjustment member sandwiched therebetween, and the thickness of the first side surface gap adjustment member is set so that the first side surface gap is included in a predetermined side surface gap range.

[0092] According to a claw compressor according to a sixth aspect of the present disclosure, in a compression chamber housing the first rotor and the second rotor, the first rotor rotates about a first rotation axis, the second rotor rotates about a second rotation axis in the opposite direction to the first rotor, and the fluid is compressed by the meshing of the first claws with the second claws. The first rotor and the second rotor are housed in recesses in the main case, and are sealed in the compression chamber by the front case with the first case end face of the main case facing the second case end face of the front case.

[0093] According to a sixth aspect of the present disclosure, the claw compressor includes a cylinder portion surrounding the first side surface of the first rotor and the second side surface of the second rotor, the cylinder portion being divided into a first cylinder case having an intake port formed therein and a second cylinder case forming a compression chamber together with the first cylinder case. The first side clearance adjustment member is sandwiched between the first cylinder case and the second cylinder case, and its thickness is set so that the first side clearance falls within a predetermined side clearance range.

[0094] Therefore, it is possible to prevent a decrease in compression efficiency caused by the first side clearance being larger than the predetermined side clearance range. Also, it is possible to prevent contact between components caused by the first side clearance being smaller than the predetermined side clearance range. In this way, with the claw compressor according to the sixth aspect of the present disclosure, it is possible to achieve high compression efficiency by appropriately setting the gaps between the first rotor and the second rotor and the members forming the compression chamber.

[0095] The claw compressor according to a seventh aspect of the present disclosure is the sixth aspect, further including the following configuration: a second side clearance adjustment member (9e4) that adjusts the second radial side clearance (CL6) between the second rotor and the second cylinder case, the first cylinder case and the second cylinder case are connected to each other at a first opposing position (P1) where they face each other on the first rotor side with the first side clearance adjustment member sandwiched therebetween, the first cylinder case and the second cylinder case are connected to each other at a second opposing position (P2) where they face each other on the second rotor side with the second side clearance adjustment member sandwiched therebetween, and the thickness of the second side clearance adjustment member is set so that the second side clearance is within the predetermined side clearance range.

[0096] According to the claw compressor of the seventh aspect of the present disclosure, the second side clearance adjustment member is sandwiched between the first cylinder case and the second cylinder case, and its thickness is set so that the second side clearance falls within a predetermined side clearance range. This prevents a decrease in compression efficiency due to the second side clearance being larger than the predetermined side clearance range. It also prevents contact between components due to the second side clearance being smaller than the predetermined side clearance range.

[0097] A claw compressor according to an eighth aspect of the present disclosure is the sixth aspect, further including the following configuration: That is, the cylinder section has a third cylinder case (9e6) that forms the compression chamber together with the first cylinder case, and a second side clearance adjustment member (9e4) that adjusts the second radial side clearance (CL6) between the second rotor and the third cylinder case, the first cylinder case and the second cylinder case are connected to each other at a pair of first opposing positions (P1) where they face each other on the first rotor side, with the first side clearance adjustment member sandwiched between them, and the first cylinder case and the third cylinder case are connected to each other at a pair of second opposing positions (P2) where they face each other on the second rotor side, with the second side clearance adjustment member sandwiched between them, and a thickness of the second side clearance adjustment member is set so that the second side clearance is within the predetermined side clearance range.

[0098] According to the claw compressor of the eighth aspect of the present disclosure, the second side clearance adjustment member is sandwiched between the first cylinder case and the third cylinder case, and its thickness is set so that the second side clearance falls within a predetermined side clearance range. This prevents a decrease in compression efficiency due to the second side clearance being larger than the predetermined side clearance range. It also prevents contact between components due to the second side clearance being smaller than the predetermined side clearance range.

[0099] DESCRIPTION OF SYMBOLS 1, 1A, 1B, 1C, 1D Claw compressor 3 Compression section 4 First bottom clearance adjustment member 5 Gear section 6 Second bottom clearance adjustment member 7 Front case 7a Second case end face 7b Sealing surface 8 Tip clearance adjustment member 9 Main case 9A Recess 9a Inner wall 9a1 Virtual line 9b Bottom section 9c First case end face 9d Main body section 9e Cylinder section 9e1 First cylinder case 9e2, 9e5 Second cylinder case 9e3 First side clearance adjustment member 9e4 Second side clearance adjustment member 9e6 Third cylinder case 11 Gear case 12 Leg section 13 Intake port 15 Discharge port 20 Compression chamber 21 Gear chamber 23 O-ring 24 Male rotor (first rotor) 24a, 26a Claw section 24b, 26b Recess 24c, 26c Recess 24d, 26d Bottom surface 24e, 26e Tip surface 24f Side surface (first side surface) 26 Female rotor (second rotor) 26f Side surface (second side surface) 31 First bolt 32 First rotating shaft 32a First axis end surface 37 Tip side bearing 38 Rear end side bearing 39 First timing gear 41 Second bolt 42 Second rotating shaft 42a Second axis end surface 47 Tip side bearing 48 Rear end side bearing 49 Second timing gear 50 Connecting member CL1 First bottom surface gap CL2 Second bottom surface gap CL3 First tip clearance CL4 Second tip clearance CL5 First side surface gap CL6 Second side surface gap HD Horizontal direction O1 First rotation axis O2 Second rotation axis P1 First opposing position P2 Second opposing position PL1 First plane PL2 Second plane VD Vertical direction

Claims

1. A compressor comprising: a first rotor having a plurality of first claws protruding radially and rotating about a first rotation axis; a second rotor having a plurality of second claws protruding radially and rotating about a second rotation axis in the opposite direction to the first rotor; and a compression section forming a compression chamber accommodating the first rotor and the second rotor, wherein the compression section has: a main case having a recess formed at one end to accommodate the first rotor and the second rotor; and a front case attached to the main case so as to seal the recess and forming the compression chamber together with the recess, wherein the main case has a first case end face arranged on a first plane so as to surround the first rotor and the second rotor; the front case has a second case end face arranged on a second plane opposite the first case end face so as to surround the first rotor and the second rotor, and a sealing surface arranged surrounded by the second case end face and sealing the compression chamber, wherein the first rotor has a first rotor tip face arranged opposite the sealing surface, the second rotor has a second rotor tip surface disposed opposite the sealing surface, and a predetermined distance from the first case end surface to the sealing surface is set so that a first tip gap from the first rotor tip surface to the sealing surface and a second tip gap from the second rotor tip surface to the sealing surface are within a predetermined tip gap range.

2. A claw compressor as described in claim 1, further comprising a plate-shaped tip gap adjustment member that is arranged in contact with both the first case end face and the second case end face, and the thickness of the tip gap adjustment member is set so that the first tip gap and the second tip gap are within the specified tip gap range.

3. A claw compressor as described in claim 1, wherein the sealing surface is located at a position farther away from the first rotor tip surface and the second rotor tip surface than the second case end surface, and the distance from the second case end surface to the sealing surface is set so that the first tip gap and the second tip gap are within the specified tip gap range.

4. A claw compressor as described in claim 1, wherein the sealing surface is positioned closer to the first rotor tip surface and the second rotor tip surface than the second case end surface, and the distance from the second case end surface to the sealing surface is set so that the first tip gap and the second tip gap are within the specified tip gap range.

5. A claw compressor as claimed in any one of claims 1 to 4, wherein the first rotor is attached to the first rotating shaft with a first bottom gap adjustment member sandwiched between it and the first shaft tip surface of the first rotating shaft, and has a first rotor bottom surface positioned opposite a bottom surface portion positioned in the recess of the main case; the second rotor is attached to the second rotating shaft with a second bottom gap adjustment member sandwiched between it and the second shaft tip surface of the second rotating shaft, and has a second rotor bottom surface positioned opposite the bottom surface portion; the thickness of the first bottom gap adjustment member is set so that a first bottom gap from the first rotor bottom surface to the bottom surface portion is included in a predetermined bottom gap range; and the thickness of the second bottom gap adjustment member is set so that a second bottom gap from the second rotor bottom surface to the bottom surface portion is included in the predetermined bottom gap range.

6. A compressor comprising: a first rotor having a plurality of first claws protruding in the radial direction and rotating about a first rotation axis; a second rotor having a plurality of second claws protruding in the radial direction and rotating about a second rotation axis in the opposite direction to the first rotor; and a compression section forming a compression chamber accommodating the first rotor and the second rotor, wherein the compression section has: a main case having a recess formed at one end to accommodate the first rotor and the second rotor; and a front case attached to the main case so as to seal the recess and forming the compression chamber together with the recess, wherein the main case has: a cylinder section arranged to surround a first side surface of the first rotor about a first axis along the first rotation axis and a second side surface of the second rotor about a second axis along the second rotation axis; and a bottom surface portion forming the bottom surface of the recess, wherein the cylinder section comprises: a first cylinder case formed with an intake port for drawing fluid into the compression chamber; and a second cylinder case forming the compression chamber together with the first cylinder case. a first side clearance adjustment member that adjusts a first radial side clearance between the first rotor and the second cylinder case, wherein the first cylinder case and the second cylinder case are connected with the first side clearance adjustment member sandwiched therebetween, and the thickness of the first side clearance adjustment member is set so that the first side clearance is within a predetermined side clearance range.

7. A claw compressor as described in claim 6, further comprising a second side clearance adjustment member for adjusting the second radial side clearance between the second rotor and the second cylinder case, wherein the first cylinder case and the second cylinder case are connected at a first opposing position where they face each other on the first rotor side with the first side clearance adjustment member sandwiched therebetween, and the first cylinder case and the second cylinder case are connected at a second opposing position where they face each other on the second rotor side with the second side clearance adjustment member sandwiched therebetween, and the thickness of the second side clearance adjustment member is set so that the second side clearance is included in the predetermined side clearance range.

8. A claw compressor as described in claim 6, wherein the cylinder section has a third cylinder case which forms the compression chamber together with the first cylinder case, and a second side clearance adjustment member which adjusts the second radial side clearance between the second rotor and the second cylinder case, the first cylinder case and the second cylinder case are connected at a pair of first opposing positions facing each other on the first rotor side with the first side clearance adjustment member sandwiched between them, the first cylinder case and the third cylinder case are connected at a pair of second opposing positions facing each other on the second rotor side with the second side clearance adjustment member sandwiched between them, and the thickness of the second side clearance adjustment member is set so that the second side clearance is included in the specified side clearance range.

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