JPS6323598Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a vane compressor that is applied to air conditioners, etc., and specifically prevents contact (galling) between the small arc of the cam ring and the rotor, which occurs due to thermal deformation during operation. It is designed so that it can be prevented as much as possible.

As shown in FIGS. 1 and 2, a vane compressor generally includes a rotating shaft 1, a rotor 2 rotated via the rotating shaft 1, and a large number of vanes attached to the rotor 2 so as to be freely retractable in a substantially radial direction. 3...3 and Vane 3...
A cam ring 4 that accommodates the rotor 2 to which the rotor 3 is attached, front and rear side plates 6 and 7 that sandwich the cam ring 4 and form a pump chamber 5 on the inner periphery of the cam ring 4, and these side plates. 6, 7 to a housing 8 housing the rotor 2, and when the rotor 2 is rotated, the vanes 3...3 attached to the rotor 2 slide while being pressed against the inner peripheral surface of the cam ring 4. At that time, the working gas is transferred to the suction hole 9a and the front side plate 6 by the volume change between each vane 3, 3.
It is introduced into the pump chamber 5 through the suction passage 9 provided in the rear side plate 7, pressurized, and discharged into the discharge chamber 11 through the discharge passage 10 provided in the rear side plate 7. discharge into the condenser. Further, the oil in the oil reservoir 12 in the discharge chamber 11 connected to the discharge passage 10 is removed by the gas discharge pressure between the oil passage 13 provided in the side plate 7 and the space between the rotation shaft 1 and the gas-liquid separator 14. 2a of the rotor 2 through the space 15 formed in the space 15, and the aperture ring 16 and bearing 17 between the rear side plate 7 and the rotating shaft 1.
A predetermined back pressure is applied to the vanes 3, and the vanes 3 are pressed against the inner circumferential surface of the cam ring 4 by the back pressure. 18
is an annular groove connecting the bottom grooves 2b...2b, and the bottom grooves 2b...2b communicate with the oil passage 13 via the groove 18. Reference numeral 19 denotes an oil supercharging passage, and the oil supercharging passage 19 is provided with a check valve 20 that opens when the differential pressure between the gas discharge pressure and the suction pressure is less than a set value and closes when the differential pressure is equal to or higher than the set value. When starting the compressor with low gas discharge pressure, the check valve 20 opens the oil supercharging passage 19 and throttles the gas discharge pressure directly from the annular groove 18 to the bottom groove 2b of the vane receiving hole 2a...2a without using the ring 16 or the like. …
2b is being introduced.

By the way, in the conventional vane compressor of this kind, as shown in FIG. Since the cam ring 4 was formed substantially uniformly in the axial direction so that the front side and the rear side were equal, the cam ring 4 was thermally deformed as shown in Fig. 4 during compressor operation, and the clearance between the cam ring 4 and the rotor 2 on the front side was small. This caused problems such as contact and interference between the parts, resulting in seizure.

This is because the gas sucked through the suction hole 9a by the operation of the compressor has a relatively bottom temperature, and while it cools the front side plate 6 and the cam ring 4 near the plate 6, the vanes 3... This is because the compressed gas (discharge gas) in the chamber 5 becomes high temperature and heats the rear side plate 7 and the cam ring 4 near the plate 6.

The present invention was developed with the aim of solving the above-mentioned conventional problems, and its gist is that the clearance C in the small circular arc portion of the cam ring is changed from the front side to the rear side, as shown in the drawings from Figure 5 onwards. The front side plate 6 and the like are cooled and contracted by the suction gas during compressor operation, and the rear side plate 7
The structure is such that the clearances on the front side and the rear side become approximately uniform when the parts such as the above are heated and expanded by the discharged gas.

FIG. 5 shows the first embodiment of the present invention. In this embodiment, the entire outer peripheral surface of the rotor 2 is tapered in the axial direction, so that the front clearance is larger than the rear clearance at room temperature. Indicates the case where

FIG. 6 shows a second embodiment of the present invention, in which approximately half of the outer peripheral surface of the rotor 2 on the front side is tapered in the axial direction.

FIG. 7 shows a third embodiment of the present invention, in which the front end of the rotor 2 is reduced in diameter and the rotor 2 is formed to have two diameters, large and small.

FIG. 8 shows a fourth embodiment of the present invention, in which the rotor 2 is formed to have three diameters: large, medium, and small.

FIG. 9 shows a fifth embodiment of the present invention, in which the inner circumferential surface of the cam ring 4 is tapered in the axial direction.

As explained above, the present invention includes a rotating shaft, a rotor that is rotated via the rotating shaft, a large number of vanes that are attached to the rotor so as to be freely retractable in a substantially radial direction, and a rotor that houses the vanes. A cam ring, a pair of front and rear side plates that sandwich the cam ring and form a pump chamber on the inner periphery of the cam ring, and a housing that accommodates these side plates or the rotor. When the rotor rotates, the vanes attached to the rotor slide while being pressed against the inner peripheral surface of the cam ring, and the volume change between each vane at that time causes working gas to be transferred to the suction provided on the front side plate. In a vane compressor that is introduced into a pump chamber via a passage, pressurized, and discharged to the outside via a discharge passage provided in the rear side plate, the cam ring and Since the clearance between the rotor and the front side is set to be different in the axial direction so that the front side is larger than the rear side, thermal deformation during compressor operation causes the front side cam ring to Even if the clearance between the compressor and the rotor is reduced, contact interference between the two can be prevented, and the durability of the compressor can be greatly improved.

[Brief explanation of the drawing]

Figure 1 is a sectional view taken along the - line in Figure 2 of the vane compressor, Figure 2 is a sectional view taken along the line - in Figure 1 with a part of the gas-liquid separator and side plate cut away, and 3 is a cross-sectional view of the vicinity of the small circular arc portion of the cam ring of a conventional vane compressor, FIG. 4 is a cross-sectional view showing the drawbacks of the conventional method, and FIG. 6, 7, 8, and 9 are sectional views of main parts of other embodiments. 1... Rotating shaft, 2... Rotor, 2a... Vane receiving hole, 3... Vane, 4... Cam ring, 5...
Pump chamber, 6... Front side plate, 7
...Rear side plate, 8...Housing,
9...Suction passage, 10...Discharge passage, 11...Discharge chamber.

Claims (1)

[Scope of utility model registration request] A rotating shaft, a rotor rotated via the rotating shaft, a large number of vanes attached to the rotor so as to be freely retractable approximately in a radial direction, a cam ring that accommodates the rotor with the vanes attached, and a cam ring that holds the cam ring in place. The cam ring has a pair of front and rear side plates that form a pump chamber on the inner periphery of the cam ring, and a housing that accommodates these side plates or the rotor, and is attached to the rotor when the rotor is rotated. The vanes slide while being pressed against the inner peripheral surface of the cam ring, and the volume change between each vane at that time introduces working gas into the pump chamber through the suction passage provided in the front side plate. In a vane compressor configured to pressurize and discharge to the outside through a discharge passage provided in the rear side plate, a clearance between the cam ring and the rotor at a small circular arc portion of the cam ring is provided. , so that the front side is larger than the rear side,
A vane compressor characterized by being formed with a difference in the axial direction.