Patent Application
20130315771
1. Field of the Invention
The present invention relates to a gas compressor, and more particularly to a vane rotary type gas compressor using vanes.
2. Related Background of the Invention
A conventional gas compressor is constructed by a substantially tubular housing, a power transmitter fixed to one end side of the housing, and a compression mechanism accommodated in the housing.
The compression mechanism accommodated in the substantially tubular housing is constructed by a cylinder block having an oval space in its inner side, a rotor rotatably fitted to the cylinder block, vanes formed in the rotor and accommodated in vane grooves, and a drive shaft integrally formed with the rotor and coupled to the power transmitter.
The integrally formed rotor is rotated when a drive power which is transmitted by the power transmitter is transmitted to the drive shaft. The vanes are protruded from the vane grooves by a centrifugal force or a pressure of a coolant, an oil or the like injected into a back pressure chamber formed in bottom portions within the vane grooves, due to rotation of the rotor, and the coolant sucked into the cylinder block is compressed between a leading end of the vane and an inner wall of the cylinder block.
However, in the conventional gas compressor, when the gas compressor is driven, sliding sound of the vanes, discharge sound of the coolant gas, vibration sound of a casing caused by the sliding sound, the discharge sound and the like, and a radiation sound caused by rotation of the rotor leak out of the gas compressor, and noise is generated.
Accordingly, as shown in Patent Document 1, there has been proposed an invention configured to suppress the vibration of the compression mechanism by a thick portion provided at a position opposed to an outer peripheral surface of the cylinder in the casing.
[Patent Document 1] Japanese Patent Laid-Open Publication No. Hei 09-68180 A
However, although in the gas compressor described in the Patent Document 1, the noise and the vibration generated by operation of the gas compressor are suppressed by the thick portion provided at the position opposed to the outer peripheral surface of the cylinder in the casing, there has been a problem that mass of the gas compressor is increased by the provision of the thick portion.
Accordingly, the present invention aims at providing a vane rotary type gas compressor which can suppress noise and vibration of the gas compressor without increasing mass of the gas compressor.
In order to achieve the above-mentioned object, according to the present invention, there is provided a vane rotary type gas compressor 1 including a casing 8, a compressor main body 3 provided within the casing 8 and compressing a coolant sucked by rotary drive, and a drive power transmitter 4 applying a rotary drive power to the compressor main body 3, wherein an outer peripheral wall 22 of the casing 8 is provided with a vibration transmission suppressing rib 38 continuously from a mounting portion 36 on a vehicle side, the vibration transmission suppressing rib 38 suppressing vibration transmission caused by the rotary drive of the compressor main body 3.
Further, the vibration transmission suppressing rib 38 is provided on a whole periphery of the outer peripheral wall of the casing 8.
Further, the vibration transmission suppressing rib 38 is provided on the outer peripheral wall 22 surrounding a periphery of the compressor main body 3 within the casing 8.
In addition, the vibration transmission suppressing rib 38 is a convex portion which projects from the outer peripheral wall 22 of the casing 8, and is provided with an auxiliary rib 42 which is extended to a flange portion 9 toward an opening portion 7 of the casing 8.
Still further, a thickness reduction portion 40 concaved to the outer peripheral wall 22 of the casing 8 from the outer periphery is provided between the flange portion 9 and the vibration transmission suppressing rib 38.
A description of an embodiment according to the present invention will be given in detail below with reference to the accompanying drawings.
A description of a vane rotary type gas compressor 1 according to a first embodiment will be given with reference to
As shown in
The substantially cylindrical casing 8 is formed into a bottomed tubular shape, and a flange 9 is formed in an opening portion 7 on one end side of the casing 8. The casing 8 is sealed by fixing an end portion of the front head 6 and the flange portion 9 formed in the opening portion 7 of the casing 8 so as to be occluded. An intake hole 20 sucking coolant into the housing 2 is formed on an outer periphery of the front head 6. Further, an intake chamber (not shown) into which the coolant sucked through the intake hole 20 flows is formed in an inner portion of the front head 6.
On an outer peripheral wall 22 of the casing 8, there are formed a discharge hole 34 which discharges the coolant compressed by the compressor main body 3 arranged within the casing 8 and mentioned later, a mounting portion 36 which mounts the gas compressor 1 to a vehicle body or the like (not shown), and a vibration transmission suppressing rib 38 which suppresses transmission of vibration caused by rotary drive of the compressor main body 3. Further, a discharge chamber 24 to which the coolant compressed by the compressor main body 3 mentioned later is discharged is formed in an inner portion of the casing 8.
The discharge hole 34 formed in the outer peripheral wall 22 of the casing 8 discharges the coolant compressed by the compressor main body 3 mentioned later.
Further, the mounting portion 36 is formed so as to protrude from the outer peripheral wall 22, and is mounted and fixed to a vehicle body or the like (not shown) by bolts.
The vibration transmission suppressing rib 38 is formed into a convex shape by being projected from the outer peripheral wall 22 of the casing 8 so as to surround the periphery of the compressor main body 3. The vibration transmission suppressing rib 38 is provided over a whole periphery of the outer peripheral wall 22 continuously from the mounting portion 36 formed on the outer peripheral wall 22.
A plurality of auxiliary ribs 42 is provided so as to be extended from the vibration transmission suppressing rib 38 toward the flange portion 9 provided in the opening portion 7 of the casing 8. As shown in
Further, thickness reduction portions 40 are provided between the flange portion 9 and the vibration transmission suppressing rib 38, the thickness reduction portion 40 being concaved from an outer periphery of the vibration transmission suppressing rib 38 toward the outer peripheral wall 22 of the casing 8.
The intake hole 20 sucking the coolant into the housing 2 is formed in an outer periphery of the front head 6, and sucks the coolant into the intake chamber within the front head 6.
The compressor main body 3 compressing the coolant sucked into the intake chamber is constructed by a cylinder block 10, a rotor 12, vanes 14, a rotary drive shaft 16, and a pair of side blocks (not shown) which are arranged so as to sandwich the cylinder block 10 and form a cylinder chamber 26.
The cylinder block 10 is provided with the cylinder chamber 26 which is formed by being sandwiched by the pair of side blocks, an intake port 28 which sucks the coolant into the cylinder chamber 26, and a discharge port 30 which discharges the coolant compressed in the cylinder chamber 26.
The rotor 12 is integrally formed with the rotary drive shaft 16 so as to be rotated by a drive power from the drive power transmitter 4. Further, vane grooves 32 are formed in the rotor 12 at even intervals in a peripheral direction, and the vanes 14 are accommodated in the vane groove 32 so as to freely rise and set.
One end side of the rotary drive shaft 16 is integrally formed with the drive power transmitter 4, and the other end side thereof is formed with the rotor 12.
The drive power transmitter 4 transmits a drive power of an engine or the like (not shown) , and performs off and on of the rotary drive power to the rotary drive shaft 16 by the off-and-on operation of an electromagnetic clutch.
Next, a description will be given of a motion of the gas compressor 1.
First of all, the drive power transmitter 4 is rotated by transmission of the drive power of the engine or the like to the drive power transmitter 4, and the rotary drive shaft 16 fixed to the drive power transmitter 4 is rotated by connection of the electromagnetic clutch.
The rotation of the rotary drive shaft 16 rotates the rotor 12 integrally formed with the rotary drive shaft 16, and causes the vanes 14 accommodated in the vane grooves 32 of the rotor 12 to protrude out of the vane grooves 32 so as to bring into contact with the inner wall of the cylinder chamber 26 of the cylinder block 10. The coolant is compressed between the vanes 14 protruding out of the vane grooves 32 and the inner wall of the cylinder chamber 26, and the coolant is discharged to the discharge chamber 24 through the discharge port 30.
When the gas compressor 1 is driven, the rotor 12 of the compressor main body 3 scrapes. Accordingly, there is generated vibration or noise, such as sound of the vanes 14 sliding with the inner wall of the cylinder chamber 26, discharge sound of the coolant gas, vibration sound of the casing 8 caused by the sliding sound and the discharge sound, and a radiation sound caused by the rotation of the rotor, but, since the vibration transmission suppressing ribs 38 are provided on the outer peripheral wall 22 continuously from the mounting portion 36 of the casing 8, the above-mentioned vibration or the noise caused by the vibration can be suppressed.
As mentioned above, according to the present invention, since a rigidity of the gas compressor 1 is enhanced by provision of the vibration transmission suppressing ribs 38 suppressing h transmission of the vibration caused by the rotary drive of the compressor main body 3 on the outer peripheral wall 22 of the casing 8 continuously from the mounting portion 36 on the vehicle side, the noise and the vibration of the gas compressor 1 can be suppressed.
Further, since the vibration transmission suppressing ribs 38 are provided on a whole periphery of the outer peripheral wall 22 of the casing 8, the rigidity of the gas compressor 1 can be enhanced.
Further, since the vibration transmission suppressing ribs 38 are provided on the outer peripheral wall 22 surrounding the periphery of the compressor main body 3 within the casing 8, the vibration generated in the gas compressor 1 can be suppressed.
In addition, since the vibration transmission suppressing rib 38 is formed as the convex portion which projects from the outer peripheral wall 22 of the casing 8, and is provided with the auxiliary rib 42 which is extended to the flange portion 9 toward the opening portion 7 of the casing 8, the rigidity of the gas compressor 1 can be further enhanced, and the noise can be suppressed.
Still further, since the thickness reduction portion 40 concaved toward the outer peripheral wall 22 of the casing 8 from the outer periphery is provided between the flange portion 9 and the vibration transmission suppressing rib 38, the rigidity of the gas compressor 1 can be enhanced without increasing mass of the gas compressor 1, and the noise can be suppressed.
The present invention is applicable to a vane rotary type gas compressor.
The present application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2012-118327, filed May 24, 2012, the entire contents of which are incorporated herein by reference.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2012-118327 | May 2012 | JP | national |
