JPH0255637B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a screw fluid device, and more particularly to an oil-free screw fluid device in which a screw rotor is directly driven by a high-frequency motor.

[Prior art]

Oil-free screw fluid devices have more leakage than oil-cooled devices because the rotors rotate without contacting each other. Therefore, the rotor rotates at a high frequency with a circumferential speed of 60 to 100 m/s to improve efficiency. In order to achieve such high speed rotation, conventional oilless screw fluid machines are driven by a motor via a speed increaser, as described in, for example, Japanese Patent Laid-Open No. 55-35168. When the screw fluid machine is operated as a compressor, the power required to compress the gas in the working chamber is relatively large, so a motor with a large output is used. On the other hand, when operating as a vacuum pump, the power required for compression is 1/1 of that of the compressor.
Since it is very small (5 to 1/10), a motor with low output is used.

As a means of increasing the speed, a driving method using a high frequency motor using an inverter other than the above as a power supply device can be considered. In this case, the inverter can generate a frequency matching the required rotor rotational speed, and the speed increaser can be eliminated.

[Problems to be Solved by the Invention] In the prior art, the speed increaser occupies a large proportion of the entire device, and no consideration was given to miniaturizing the device.

Furthermore, no consideration was given to ease of coupling the oilless screw fluid machine and the motor.

SUMMARY OF THE INVENTION An object of the present invention is to provide a small-sized oil-free screw fluid device in which an oil-free screw fluid machine and a motor for driving the same can be easily connected.

[Means to solve the problem]

The above purpose is to form splines that mesh with each other on the shaft end side of one of the male rotor or female rotor and the motor shaft end, and to connect the casing of the fluid machine and the motor casing through a housing that accommodates a timing gear. This is achieved by configuring the splines of the rotor shaft and motor shaft to be completely engaged with each other by coupling them together.

[Effect]

To connect the fluid machine and the motor, first, the splines formed on the shaft end of the rotor and the splines formed on the shaft end of the motor are engaged, and then the flange formed on the timing gear housing is connected to the discharge side casing. These are joined together using a flange formed on the motor casing. After coupling, the splines of the rotor shaft and motor shaft are completely engaged, and the two are integrally coupled.

During high-speed rotation, the twisting and tilting of the core at the joints creates an excitation force for vibration, so a high level of centering work is required during assembly. In consideration of this point, the present invention forms a spline at one end of the rotor shaft and motor shaft, and connects the motor casing to the fluid mechanism casing, thereby simultaneously connecting the rotor shaft and motor shaft, eliminating the need for tube removal work. And so.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1, 2, 3, and 4.

The oil-free screw fluid device consists of a oil-free screw fluid machine and a high-frequency motor.

First, the configuration of the oil-free screw fluid machine will be explained. 1 is a main casing, 2 is a discharge side casing, and 3 is an end cover, which constitute a casing section. 4 is a male rotor, 5 is a female rotor, and has a main casing 1 and a discharge side casing 2.
A working chamber 6 is formed between the male and female rotors 4 and 5 which are housed in the casings 1 and 2 and mesh with each other.
It consists of The male and female rotors 4 and 5 are connected to the main casing 1 and the discharge side casing 2 by bearings 7 and 8 at both ends.
is supported by A male timing gear 9 and a female timing gear 10 attached to the discharge side shaft ends of both rotors 4 and 5 maintain a slight clearance and rotate while meshing with each other. A shaft sealing device 11 seals the lubricating oil supplied to the bearings 7, 8 and the timing gears 9, 10 to prevent the lubricating oil from flowing into the aforementioned working chamber. A slinger 12 splashes oil in an oil sump 13 formed by the end cover 3 and a part of the main casing 1, and supplies oil to the bearing 7. 14 is a suction port formed in the main casing 1, and 15 is a suction passage. Also,
16 is a discharge port formed in the discharge side casing 2, and 17 is a discharge passage.

Next, the configuration of the high frequency motor will be explained. The rotor 21 is attached to a motor shaft 22, and the stator 23 is attached to a motor casing 24. Both ends of the motor shaft 22 are supported by bearings 2 provided on the side walls of the motor casing 24.
It is supported by 5.

The connection between the oil-free screw fluid machine and the high-frequency motor is as follows. First, the configuration of the coupling section will be explained. The fluid machine side of the motor casing 24 forms a housing 31 that covers the male and female timing gears 9 and 10, and a flange 32 is formed at the outer peripheral end of the housing 31. Also, a nozzle 3 supplies lubricating oil to the bearing 8 and timing gears 9 and 10.
8 and an oil drain hole 39 are formed. On the other hand, there is also a flange 32 on the high frequency motor side of the discharge side casing 2.
A flange 33 facing the is formed. A male spline 34 is formed on the shaft end of the motor shaft 22 that protrudes from the bearing 25, and a female spline 3 that engages with the male spline 34 is formed on the male rotor shaft end.
5 is formed. In such a configuration,
When the flanges 32 and 33 are connected with the bolt 36, the splines 34 and 35 are simultaneously engaged, completing the connection between the fluid machine and the high frequency motor. In addition,
The axis of the male rotor 4 and motor shaft 22 is located at the flange 3
It is automatically adjusted by the notches 37 provided at 2 and 33.

In addition, in the above specification, timing gears 9, 1
The housing 31 covering the motor casing 2
The housing 31 is integrally formed with the discharge casing 2 of the fluid machine, and is connected to the housing 31 by flanges 32 and 33 provided on the discharge side casing 2 of the fluid machine. It goes without saying that the flanges 32 and 33 may be provided on the housing 31 and the motor casing 24. Alternatively, the housing 31 may be independent, and flanges may be provided on the discharge side casing 2 side and the motor casing 24 side, respectively. In short, any structure may be used as long as the casing of the fluid machine and the casing of the motor are coupled via the flange of the timing gear housing, thereby spline-coupling the end of the rotor shaft and the end of the motor shaft.

〔Effect of the invention〕

As described above, according to the present invention, since the fluid machine and the motor can be easily connected, the assembly can be simplified.

[Brief explanation of drawings]

FIG. 1 is a plan sectional view of the oil-free screw fluid device of the present invention, FIG. 2 is a cross-sectional view of FIG. 1,
FIG. 3 is an enlarged cross-sectional view of FIG. 1, and FIG. 4 is a cross-sectional view of FIG. 1. 2...Discharge side casing, 4...Male rotor, 2
2...Motor shaft, 24...Motor casing, 3
1...Housing, 32...Flange, 33...
Flange, 34...male spline, 35...female spline.

Claims (1)

[Claims] 1. A male rotor and a female rotor each having a convex line and a concave line formed in a spiral shape on the outer periphery are housed in a casing so that these convex lines and concave lines engage with each other at the rotor facing part, and the shaft of each rotor is In an oilless screw fluid machine equipped with a timing gear attached to an end of the screw fluid machine for transmitting rotational force from one side to the other, and a motor for driving the screw fluid machine, one shaft of the rotor shafts of the male and female rotors is used. A female or male spline is formed on the end side, and a male or female spline that engages with the spline of the rotor shaft is formed on the end side of the motor shaft, and the timing gear is connected to the fluid machine through a housing that accommodates the timing gear. By combining the casing and motor casing,
An oil-free screw fluid device characterized in that the rotor shaft end side and the motor shaft end side are spline-coupled within the housing of the timing gear.