JPS5910701A - Screw type fluid machine - Google Patents

Abstract

PURPOSE:To secure a space for enabling the sure insertion of a gauge or the like in between rotors, by providing a gap adjusting hole in the suction region of a main casing, whose area facing the rotors is larger than a discharge port. CONSTITUTION:Among working chamber 7W, those 7W1-7W4 communicate with a suction port 43 and serve as a suction region. A gap adjusting hole 21 is provided for the suction region. a thickness gauge is inserted through the gap adjusting hole 21 so that the gauge is placed on the front and rear surfaces of the teeth of both rotors 25, 26. After the gap between the rotors, 25, 26 is made uniform on both the front and rear surfaces, coupling is effected.

Description

[Detailed description of the invention] [Field of application of the invention] The present invention relates to an oil-free screw fluid machine.

[Background of the invention]

Since the operating space of oil-free screw fluid machines is lubricated, a pair of timing gears is provided between the male rotor and the female rotor that rotates in mesh with the male rotor in order to avoid contact with the female rotor.

When the timing gear is fastened to both rotors, a gap gauge is inserted between the female rotor and the male rotor to equalize the gap between the two rotors before the timing gear is fastened.

Conventionally, when inserting a gap gauge between both rotors, a gap cage has been inserted from the discharge port, but depending on the position of the discharge port, it may not be possible to secure a size sufficient to reliably insert the gap gauge between the two rotors. Furthermore, if the rotor size is small or if the ratio of the discharge pressure to the suction pressure is large, the discharge port becomes small and there is a problem in that it is not possible to secure the size necessary to reliably insert the gap cage.

LObject of the invention] An object of the invention is to ensure a size that allows a clearance gauge to be reliably inserted between both rotors.

Summary of the Invention The present invention is characterized in that a working hole for inserting a feeler gauge between both rotors is provided through the main casing and communicated with the suction area of the working space. .

Since the area of the suction region surrounding the rotor is larger than that of the discharge port, the above objective can be easily achieved.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

1 to 4 show a first embodiment of the present invention.

The casing consists of a main casing 1, a suction side end face casing 2, and a discharge side end face casing 3, which are joined together with bolts to form an integral body.

In the main casing 1, an inner wall 5 is arranged inside an outer wall 4 at a certain distance away from the outer wall 4, and between the outer wall 4 and the inner wall 5, both walls 4 and 5 are connected, and the outer wall 4 and the inner wall are connected. A plurality of ribs 6 (6a to 6g) are provided to partition the space between the two ribs 5 into a plurality of small spaces. Two working spaces consisting of two intersecting cylindrical holes are installed inside the inner wall 5. One working space 7 is for the low pressure stage, and a part of the working space 7 is located inside the inner wall 5.
The other working space 9 is formed by a wall 10, a part of which also serves as the inner wall 5, for a high EJ stage. A low-pressure stage discharge passage 12° is connected to the low-pressure stage working space 7 through a discharge port 11, and a high-pressure stage discharge passage 14 is connected to the high-pressure stage working space 9 through a discharge port 13. Both discharge passages 12 , 14 are arranged inside the inner wall 5 . Among the plurality of small spaces between the outer wall 4 and the inner wall 5, small spaces 15, 16, 17, 18
A group of heat transfer tubes 15t, 16t, 17t, and 18t are arranged, and a small space 15.16 is used as an intercooler IC to cool the compressed gas flowing between the low pressure stage and the high pressure stage, and a space 17.18 is used as an intercooler IC for cooling the compressed gas flowing between the low pressure stage and the high pressure stage. It is used as a postcooler AC to cool the compressed gas discharged from the stage. Space 19 is
It is used as a return passage for guiding the compressed gas discharged from the space 16 of the intercooler IC to the suction passage of the high-pressure stage working space 9. Further, the space 20 is used as a passage for guiding the compressed gas discharged from the small space 18 of the post-cooler AC to the outlet.

These two passages 19 and 20 are not necessarily necessary passages, but are determined by the relationship between the 12t inlet of the small space 16 of the intercooler IC and the inlet of the low pressure stage suction passage, and the relationship between the small space 18 of the postcooler AC. υ
Depending on the positional relationship between the mouth and the drainage port, it may not be necessary.

The gap adjustment hole 21 is provided so as to completely penetrate the outer wall 4 and the inner wall 5 and reach the low pressure stage working space 7 . Similarly, a gap adjustment hole 22 is provided in the high-pressure stage working space 9. These gap adjustment holes 2
1.22 is the male rotor 25. Each tooth and construction of the female rotor 26! The working chamber 7W' (7W+, 7Wz...) 9W (9Wt,
9W2...) in a region communicating with the suction ports 43, 44.The details will be explained with reference to FIG. 6. FIG. 6 shows the inner wall surface of the M space 7 for low pressure stage and FIG. 6 is a developed view of the outer circumferential surface of the screw rotor 25 and 26.

7W 1 (9W 1) to 7W 4 in the working chamber 7W
(9W4) is in communication with the intake port 43 (44),
This area becomes the inhalation area. The gap adjustment hole 21 (22) is provided in this area.

When connecting a timing gear to a male rotor shaft and a rear rotor shaft, which will be described later, these holes 21 and 22 for adjusting the gap are the same as the forward and backward surfaces of the tooth profile. This is the work hole used when performing the work to make the gap cage from this work hole to the forward surface of the loaf shape between both rotors. ;Proceed to...j.

Both working holes 21° and 22 are normally unnecessary, so blind 7 langes 23
．． 24 is closed. The working space 7 for the low pressure stage
The male rotor 25J female rotor 2fi/
'It has been completed. - Bearings 271 and 287 are open-chained on the shafts of both rotors 257 and 26J, and the rotor discharge 01ll is connected to the main casing 1 through the bearing 271, and the suction side is connected to the suction end face casing 2 through the bearing 28J. is supported by A pair of timing gears 2 are attached to the shafts of the O-J-rotor 257 and the female rotor 261f.
97.30J is fitted, and after making the gap between the rotors uniform on both the forward and reverse surfaces as described above, they are combined. Since the rotor, bearing, and timing gear are the same for the high-pressure stage, they will be indicated by adding an h after the number, and the explanation will be omitted. Another male rotor 25I! A driving gear 31/? that transmits the rotor driving force is attached to the shaft portion of the shaft. is embedded.

Although not shown, there is a drive gear for the high pressure stage as well. The suction side end face casing 2 includes a low pressure stage suction passage 3.
21. A communication passage 33 and a high pressure stage suction passage 32 that communicate the insides of the tube group 151 and the tube group 16t of the intercooler IC with each other.
h. A communication passage 34 is provided that communicates the inside of the tube group 17t and the tube group 18t of the post-cooler AC with each other, and each of these passages is connected to the outer wall 35.h. It is partitioned off by a partition wall 36. The discharge side end face casing 3 includes a low pressure stage discharge passage 12.
and the inside of the tube group 15t of the intercooler IC. A communication passage 38° that communicates the inside of the tube group 16t of the intercooler IC with the return passage 19; and a high-pressure stage discharge passage 14.
A communication passage 39. communicates with the inside of the heat exchanger tube group 17t of the post-cooler AC. A communication passage 40 is provided that communicates the inside of the heat exchanger tube group 181 of the post-cooler AC with the return passage 2°,
Each of these passages is partitioned by an outer wall 41 and a partition wall 42.

FIG. 7 shows a second embodiment of the present invention, which is an embodiment in which there is only one working space. In this embodiment as well, the position and configuration of the gap adjustment working hole 21 are the same as in the first embodiment, so the same reference numerals are given and the explanation thereof will be omitted.

In addition, in the same figure, the reference numeral 45 is a discharge passage.

〔Effect of the invention〕

As described above, the present invention provides a gap adjustment working hole in the suction area of the main casing, which has a larger area facing the rotor than the discharge port. The possible range is wide, and a space for inserting gauges can be ensured in the gap between the rotors.

[Brief explanation of the drawing]

1 to 7 are explanatory diagrams of the present invention, in which FIG. 1 is a longitudinal sectional view of the main casing of the first embodiment, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 7, and FIG. Figure 3 is a sectional view taken along the ■-■ line in Figure 1, Figure 4 is a sectional view taken along the ■-■ line in Figure 1, Figure 5 is a sectional view taken along the ■-V line in Figure 1, and Figure 6 is a sectional view taken along the line ■--■ in Figure 1. FIG. 7 is a developed view of the outer peripheral surface of the rotor and the inner wall surface of the working space, and is a cross-sectional view of the second embodiment of the present invention, which corresponds to the cross-sectional view taken along the line ■--■ in FIG. 1... Main casing, 2... Suction side end face casing, 3... Discharge side end face casing, 4... Outer wall,
5... Inner wall, 6... Rib, 7, 9... Working space, 1
2, 14...Discharge passage, 15.16...Intercooler space, 17.18...Post-cooler space, 19.2
0...Return passage, 25I! , 25h...male rotor, 26I! . Zero h...Female rotor, 271.2'lh, 281°28h...Bearing, 29J, 29h, 301!
, 30h...timing gear, 31r, 31h...
Drive gear, 321! , 32h... Suction passage, 38,3
9.40...Communication passage, 43.44...Intake port, 4
5...Discharge passage. Day 6/2 (/4) Hitachi, Ltd. Tsuchiura Factory

Claims (1)

[Claims] 1. A main casing having a working space, an end casing connected to an end face of the main casing, and a pair of rotors rotatably housed in the working space, so that gas enters the working space via an inlet. B. In the device configured to be discharged from the working space via the discharge port, the main casing is provided with a hole for timing adjustment that penetrates the wall of the main casing and reaches the suction area of the working space. A screw fluid machine featuring