JPH01155089A - Adjusting method for clearance between rotors of screw hydraulic machine - Google Patents

Abstract

PURPOSE:To make improvements in accuracy for timing adjusting work and reliability by rotating a rotor on one side clockwise or counterclockwise as applying a brake on a rotor on the other in the state that there is no one side of the timing gears. CONSTITUTION:A rotor 2 on one side is rotated clockwise and counterclockwise as applying a brake to a rotor 1 on the other, in these female and males rotors 1 and 2 where each of rotary encoders 25, 26 is clamped, in the state that at least one side of the timing gears is none there. During the rotation, a rotational phase difference between these rotors 1 and 2 is measured with each output pulse of these rotary encoders 25, 26, and the mean value and both minimum and maximum values are operated and stored. A clearance between these rotors is put in two with the mean value of the rotational phase difference between the stored normal rotation time and the reverse time, and afterward, hydraulic pressure is removed and thereby these male and female rotors 1, 2 and timing gears 3, 4 are reclamped.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for adjusting the clearance between rotors of a screw fluid machine, and particularly to a method for adjusting the clearance between rotors of a screw fluid machine, which is suitable for example for adjusting the timing of an oil-free screw compressor. The present invention relates to a method for adjusting the clearance between rotors.

[Conventional technology]

A conventional timing adjustment method for an oil-free screw fluid machine, for example, as described in Japanese Patent Laid-Open No. 58-67987, involves fixing either the male or female rotor so that it does not rotate; The other rotor is uncoupled from the timing gear by applying hydraulic pressure and rotated in a freely rotatable state, and the backlash of both rotors is measured in terms of rotation angle, and the position is set at 1/2 of the measured rotation angle. The method was to release the hydraulic pressure and re-engage the bolts to adjust the timing.

[Problem that the invention seeks to solve]

In the above conventional technology, since the rotation angle is measured with one rotor fixed, the rotation angle can only be measured at a specific meshing position of the male and female rotors, and the rotation angle at the center position of the backlash measured at that rotation angle can be measured. Since it is fixed, there is a problem in that it is unclear whether the fixed position at other meshing positions is at the center position of the backlash.

The present invention was made in order to solve the problems of the prior art described above, and it continuously measures the rotational phase difference between male and female rotors to improve the accuracy and reliability of timing adjustment work.
Another object of the present invention is to provide a method for adjusting the clearance between rotors of a screw fluid machine, which improves the reliability of the screw fluid machine.

[Means for solving problems]

In order to achieve the above object, the method for adjusting the clearance between rotors of a screw fluid machine according to the present invention has a male rotor and a female rotor in a casing, and a timing gear maintains a minute gap between the male and female rotors. In a method of adjusting the clearance between the rotors of a screw fluid machine that rotates while rotating, at least one of the rotors is without a timing gear, the other rotor is rotated in the forward or reverse direction while applying a brake to the other rotor, and its rotation is adjusted. The timing is adjusted using the rotational phase difference between the male and female rotors measured during the test.

In more detail, the above purpose is to apply a brake to one of the fixed female and Usui rotors of the rotary encoder, while rotating the other rotor forward and backward, with at least one of the timing gears missing. During its rotation, use the output pulses of the rotary encoder to rotate the male.

Measure the rotational phase difference of the female rotor, calculate and store the average value, minimum and maximum values, then shrink-fit the timing gear and release the connection between one rotor and the timing gear by applying hydraulic pressure. This is achieved by allocating the clearance between the rotors using the previously memorized average value of the rotational phase difference between forward rotation and reverse rotation, then removes the hydraulic pressure and reconnects the female rotor and timing gear. Ru.

[Effect]

When applying a brake to one rotor and causing the other rotor to rotate in the forward direction with no timing gear on at least one side, the rotational position of the male and female rotors is determined using the output pulses of the rotary encoders fixed to the male and female rotors, respectively. The phase difference can be calculated moment by moment, and thereby the average forward rotation phase difference can be obtained when the meshing of the male and female rotors is changed.

Furthermore, even when rotating in the opposite direction, a similar reverse rotation phase difference can be obtained. The difference between these two rotational phase differences corresponds to the average backlash when the meshing is changed.

If the timing gear and the rotor are connected approximately at the center of the butt crush, it is possible to perform timing adjustment with higher precision and reliability.

〔Example〕

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 1 to 4.

Fig. 1 is a horizontal sectional view of an oil-free screw compressor according to an embodiment of the present invention, Fig. 2 is a block diagram showing the flow of signal processing in the device shown in Fig. 1, and Fig. 3 is a timing adjustment diagram. FIG. 4 is a flowchart showing the procedure for timing adjustment.

First, the configuration of the oil-free screw compressor will be explained.

In FIG. 1, 1 is a male rotor on the driving side of a pair of rotors meshing with each other within the casing, 2 is a female rotor on the driven side, and 3 is fastened to the end of the rotor shaft of the male rotor 1. 4 is a timing gear fastened to the end of the rotor shaft of the female rotor 2; 5 is a pinion for driving the rotor shaft of the male rotor 1 (the mating gear is not shown); 6 is the female rotor 2; A suction side shaft related to the rotor shaft, 7 is a main casing that houses the male and female rotor shafts, 8 is a suction side casing, and 9 is for preventing lubricating oil from bearings etc. from entering the compression operating part. 10 is a discharge port 1-.

In the screw compressor of this embodiment, a shaft 23 of a rotary encoder 25 is fixed to the pinion 5 side of the male rotor 1 via a coupling 21, and a coupling 22 is fixed to the suction side shaft 6 of the female rotor 2. A shaft 24 of a rotary encoder 26 is fixed therebetween.

Then, as shown in FIG. 2, the rotary encoder 25
．． The 26 output pulses are sent to pulse counters 30 and 30, respectively.
31 counts pulses proportional to the rotation angles o, . . . OF of the male and female rotors 1 and 2. These pulse counters 30 and 31 are connected to an arithmetic storage device 32 such as a personal computer.

Rotational phase difference between female rotors 1 and 2 0 = OM (JF is calculated.

The arithmetic storage device 32 includes an input device 34 such as a keyboard.
, an external storage device 35 such as a hard disk, and a digital display 33 are connected.

The rotary encoders 25 and 26 have a resolution greater than the maximum pulse per rotation, and therefore can discriminate rotation angles of ten seconds or less.

Next, a method of timing adjustment will be explained with reference to FIGS. 1 to 3 and according to the procedure shown in the flowchart of FIG. 4.

With at least one of timing gears 3 and 4 missing,
While one rotor is braked manually or by any other suitable method, the other rotor is slowly rotated in the forward direction.

During this time, the arithmetic storage device 32, which has been given the forward rotation instruction (step ■) from the input device 34, outputs the pulse counter 30,
The difference O=θH−θF between the 31 pulses is calculated every time there is a pulse input, and the average value 0^ is calculated. Continue this until both rotors are fully engaged, and the final average value is 0.
Find eight.

Furthermore, the minimum value OAMIN of O during this period is also determined (step ■). Thereafter, it is slowly rotated in the reverse direction (step ■), and the maximum value OBMAX of the average value OB and O during the reverse rotation is determined as before (step ■).

After that, when the value γ (γ<1-) is inputted from the input device 34 for the distribution of the clearance between the rotors on the forward plane side (step ■), as shown in FIG. 3, the average value is 0.
Using ^ and OB, average value 0n=(1-γ)・θΔ+γ
- OB is calculated (Step ■), and after this, the difference 0-On between the current 0 and ON is displayed on the easy-to-read digital display 33 using a red LED or the like (Step ■).

For example, when γ=0.5, 0n=(0^+19B)/2, and when the clearance between the rotors is equally distributed between the front and backward planes, the digital display 33 shows O.

Also, when γ=0.7, θ□==0.3・θΔ+0.7・OB.

If it is desired to change the value of γ, it is sufficient to repeat steps ① and ② starting from the input of γ (step ①) shown in FIG.

After this work, the timing gears 3 and 4 are shrink-fitted, and as shown in JP-A-58-67987, the connection between one rotor and the timing gear is released by applying hydraulic pressure, and the rotor is The timing adjustment is completed when the oil pressure is released by slightly rotating until the indicated value on the digital display 33 becomes O.

When the rotor is slowly rotated in this state, the digital display 33 indicates the transmission rotation error of the timing gear 3.4, and the accuracy can also be checked.

According to this embodiment, by using a high-resolution encoder, it is possible to achieve high accuracy in timing adjustment, and it is possible to continuously measure the rotational phase difference while rotating. It is possible to improve the reliability of timing adjustments such as allocation of clearance between rotors.

Note that the measurement data OA explained in the above example.

OBfu θn! By storing θΔIIN, flJBMIN, γ, etc. in the external storage device 35 together with the compressor model number, second weight, etc., reliable inspection records can be obtained.

In addition, in the above embodiment, the average value OA during forward rotation and the average value OB during reverse rotation for all engagements of the rotational phase difference between the male and female rotors were used to calculate the average value On. maximum/h value OAMIN and maximum value OBMA during reverse rotation
Adjustment is also possible using X. In this case, the clearance between the rotors is distributed in the minimum backlash state.

〔Effect of the invention〕

As described above, according to the present invention, the rotational phase difference between the male and # rotors is continuously measured, improving the accuracy and reliability of timing adjustment work, and ultimately improving the reliability of screw fluid machines. A method for adjusting the clearance between rotors of a screw fluid machine can be provided.

[Brief explanation of the drawing]

FIG. 1 is a horizontal sectional view of an oil-free screw compressor according to an embodiment of the present invention, FIG. 2 is a block diagram showing the flow of signal processing in the device of FIG. 1, and FIG. 3 is a timing diagram of the oil-free screw compressor. FIG. 4 is a diagram showing data at the time of adjustment, and is a flow chart diagram showing the procedure at the time of timing adjustment.

Claims (1)

[Claims] 1. A method for adjusting the inter-rotor clearance of a screw fluid machine that has a male rotor and a female rotor in a casing, and these male and female rotors rotate while maintaining a minute gap by a timing gear. , with at least one timing gear absent, one rotor is rotated in the forward and reverse directions while the other rotor is rotated, and the rotational phase difference between the male and female rotors is measured during that rotation. A method for adjusting the clearance between rotors of a screw fluid machine, characterized in that the timing is adjusted by adjusting the timing. 2. In claim 1, the rotational phase difference is calculated using output pulses of a rotary encoder fixed to the male and female rotors. Adjustment method.