JPS6282294A - Multi-step oil less vane pump - Google Patents

Abstract

PURPOSE:To regulate movement of rotors in the thrust direction by facilitating manufacture with two pump units integratedly clamped in the axial line direction by a clamping means and interposing an elastic member between axial ends of the rotors pressed to make contact with each other by an energizing means. CONSTITUTION:Two pump units 2, 3 are clamped in their axial line direction by three bolts 35 to constitute an integrated two-step pump 1. Very small clearances are formed between right and left sides of rotors 4-2, 4-3 and vanes 10-2, 10-3 and end plate blocks 6-2, 6-3, 7-2, 7-3, but the pump units 2, 3 are constructed in two-step, then air leak in the clearances can effectively be restrained to obtain high degree of vacuum. And movement of the rotors 4-2, 4-3 in the thrust direction is regulated by a gland 27 and spring washers 26, 28, and mutual contact between side faces of the rotors 4-2, 4-3 and end plate blocks 6-2, 6-3, 7-2, 7-3 can be prevented.

Description

Detailed Description of the Invention: a. Field of Industrial Application The present invention relates to a multi-stage oilless vane pump, and particularly relates to a cylinder block housing a rotor, and a pair of end plate blocks disposed on both sides of the cylinder block. The present invention relates to a multi-stage oil-less vane pump in which a plurality of oil-less pump units constituted by the above can be arranged in series in the axial direction as required.

b. Prior art and its problems Vane pumps used as vacuum pumps are broadly classified into so-called wet type and dry type. Since the wet type has excellent airtightness around the vanes, a relatively high degree of vacuum can be easily obtained even with a single stage pump. However, the wet type has disadvantages such as oil mist entering the exhaust air and polluting the environment. On the other hand, the dry type does not have such disadvantages, but it is difficult to obtain a high degree of vacuum because the airtightness around the vanes is poor.

The present invention has been devised to effectively solve these problems, and its purpose is to easily obtain a high vacuum by configuring a dry (oil-less) vane pump in a multi-stage manner. There is a particular thing.

The gist of the present invention is to provide an oilless pump unit comprising a cylinder block housing a roller and a pair of end plate blocks having bearings for supporting the shaft of the rotor and disposed on both sides of the cylinder block. , a plurality of units are arranged in succession in the axial direction, and the plurality of units are tightened in the axial direction by a tightening means, so that the cylinder block and end plate block of each pump unit and the adjacent end plate block are airtight with each other. A communication path is formed by connecting the exhaust port and suction port of the adjacent pump unit with each other by crossing this contact surface, and the shaft end of the rotor of the adjacent pump unit is connected by a removable shaft joint. An elastic member is interposed between the mutually connected shaft ends L'l, and the thrust force of one of the pair of shafts extending outwardly of the pair of rotors located at both left and right ends is applied to the end plate. A multi-stage oilless vane pump is characterized in that it is supported by a positioning member disposed on a block, and the other shaft is biased inward by a biasing means.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 5 show an embodiment in which the present invention is applied to a two-stage oilless vane pump. As shown in FIGS. 1 and 2, this two-stage oilless vane pump 1 is composed of two pump units 2.3 arranged in series in the axial direction. Each pump unit 2.3 has a cylinder block 5 containing a rotor 4-2.4-3.
-2.5-3 and this cylinder block 5-2.5-3
A pair of end plate blocks 6-2゜6-3 arranged on both sides of
．． It is composed of 7-2, 7-3.

In detail, as shown in FIGS. 1 to 3 and 5, a rotor 4-2.4- is installed in the cylinder block 5-2.5-3.
A cylinder hole 8-2.8-3, which is slightly larger than the cylinder hole 8-2.8-3, is formed in the rotor 4-2. It is placed eccentrically. Six guide grooves 9-2.9-3 are formed in the rotor 4-2.4-3 at equal intervals inward in the radial direction 1, and these six guide grooves 9-2.9-3 Vanes 10-2 and 10-3 are slidably inserted into each of the vanes 10-2 and 10-3.

The inner peripheral surface of the cylinder hole 8-2, 8-3 has a pair of notches 11-2, 11-3, 12-2 at the center in the width direction.
．． 12-3 is formed. This notch 11-2゜1
1-3.12-2.12-3 is vane 10-2, 10
The notch 11-2 of the first-stage pump unit 2 is connected to the suction boat 13 as shown in FIGS. 1 and 3, and the final-stage pump unit The notch 12-3 of No. 3 is shown in FIG.
It is connected to a discharge boat 14 as shown in FIGS. 2 and 5. Further, an intermediate outlet 20 is connected to the notch 12-2 as clearly shown in FIG. 3, and an intermediate suction port 21 is connected to the notch 11-3 as clearly shown in FIG.

The intermediate discharge port 20 and the intermediate suction port 21 are connected via connecting channels 22 and 23 formed in the end plate blocks 7-2 and 6-3, as shown in FIGS. 1 and 4. .

On the other hand, bearings 24 are provided in the end plate blocks 6-2.6-3.7-2 and 7-3, respectively, as shown in FIG. Both ends of -2.25-3 are supported by this bearing 24. A spring washer 26 as an elastic member is inserted between the mutually adjacent bearings 24. Further, the bearing 24 at the left end in FIG. 2 is tightened by a gland 27 as a positioning member, and the bearing 24 at the right end is positioned by a spring washer 28 and a stop ring 29 as biasing means. Note that an airtight oil seal 30 is provided inside each bearing 24.

The shafts 25-2 and 25-3 of the rotor 4-2, 4-3 are interconnected by a dog joint 36, and one shaft 25-2
The driving force of a motor (not shown) is transmitted to a gear 37 attached to one end of the motor.

Cylinder block 5-2, 5-3 and end plate block 6
-2.6-3.7-2.7-3, the side surfaces adjacent to each other are each flattened, and a gasket plate 34 is inserted into these adjacent surfaces, and the cylinder hole 8-2.
8-3 and the communication passages 22 and 23 are prevented from leaking. The two pump units 2.3 are tightened in the axial direction by three bolts 35 as tightening means, as shown in FIGS. 1 to 5, thereby forming an integrated two-stage pump 1. .

d. Operation The two-stage oilless vane pump 1 is constructed as described above, and the suction boat 13 is connected to a vacuum container, etc., and the rotor 4-2, 4-3 is moved in the direction of the arrow in FIGS. 3 and 5. When rotated, the tips of the vanes 10-2 and 10-3 come into sliding contact with the inner peripheral surfaces of the cylinder holes 8-2 and 8-3 due to centrifugal force. At this time, the volume between the vanes 10-2, 10-3 increases on the left side in FIGS. 3 and 5 centering on the shafts 25-2 and 25-3 of the rotor 4-2. decreases in Therefore, the air inside the vacuum container etc. is first drawn into the first-stage bomb unit 2 from the suction boat 13, and then into the intermediate exhaust port 20. It is sucked into the final stage pump unit 3 via the shaft passages 22, 23 and the intermediate suction port 21, and then discharged to the outside from the discharge boat 14.

In addition, rotor 4-2.4-3 and vane 10-2.1
The left and right sides of 0-3 and the end plate blocks 6-2°6-3.
7-2 and 7-3, a small gap is formed in order to avoid friction as shown in FIG. 2, but in the present invention, the pump unit 2.3 is configured in two stages. Therefore, air leakage in the gap can be effectively suppressed, and a high degree of vacuum can be obtained. Note that each rotor 4-2.
1-3 is a gland 27 and a spring washer 26.
28 restricts movement in the thrust direction, the above-mentioned gap is reliably maintained, and the side surface of the rotor 4-2.4-3 and the end plate block 6-2.6-3.7-2°7-3 are mutual contact can be prevented.

Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment and can be modified in various ways. For example, in the above embodiment, the pump unit 7 2.3 is configured in two stages, but it may be configured in multiple stages of three or more stages depending on the application. Figures 6 to 9 show an embodiment in which the pump unit 2.3.16 is composed of three stages, and this pump l can obtain a higher degree of vacuum than the two-stage type. I can do it. In the case of this three-stage pump 1, the pump unit 16 shown in FIG. 7 may be inserted between the pump units 2 and 3 of the two-stage pump described above as shown in FIG. In FIGS. 6 and 7, 40 and 41 are communication passages, 42 is an intermediate intake port, and 43 is an intermediate discharge port. Other parts that are the same as those in Figures 1 to 5 have the same reference numerals (
A subscript 16 is added as necessary) and the explanation thereof will be omitted. In a pump 1 having three or more stages, dog joints 36 are provided at both ends of the shaft 25-16 of the rotor 4-16 of the intermediate bomb unit 1-16, as shown in FIG.

Although the present invention relates to a multi-stage pump, it is also possible to configure a plurality of independent pumps by providing each pump unit with a suction boat 44 and a discharge boat 45, as shown in FIG. . In FIG. 9, 4 is a rotor, 5 is a cylinder block, 8 is a cylinder hole, 9 is a guide groove, 10 is a vane, and 11.12 is a notch.

e. Effects of the Invention As described above, the present invention comprises a plurality of pump units arranged in succession in the axial direction and fastened in the axial direction by fastening means to constitute an integrated multi-stage oilless vane pump. , a multi-stage pump with a desired number of stages can be constructed easily and at low cost using a common unit. Furthermore, since the pump according to the present invention is a dry type, there is no concern about environmental pollution at all, and since it is a multistage type, it is possible to obtain a high degree of vacuum.

Further, in the present invention, an elastic member is interposed between the shaft ends of the rotor, and the shaft ends are pressed together by the urging means, so that movement of the rotor in the thrust direction can be restricted, and the rotor Mutual contact between the side surfaces and the end plate block can be prevented.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a plan view of a two-stage oilless vane pump, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a plan view of a two-stage oilless vane pump. is a cross-sectional view taken along the line ■-■ in Figure 2, Figure 4 is a cross-sectional view taken along the line ■-■ in Figure 5, and
The figures are the same sectional view taken along the line V-V, Figure 6 is a plan view of the three-stage oilless vane pump, Figure 7 is a sectional view taken along the ■-■ line in Figure 6, and Figure 8 is the intermediate A side view of the rotor of the pump unit, and FIG. 9 is a longitudinal sectional view of the pump unit when each pump unit is used as an independent pump. 2.3.16... Pump unit, 4-2.4-3.4-16... Rotor, 5-2.5-
3.5-16...Cylinder block, 6-2.6-3
．． 7-2.7-3... End plate block, 8-2. ．． 8-
3.8-16...Cylinder hole, 10-2, 10-3
, 10-16... vane, 13... suction port,
14...Discharge port, 22, 23.40.4
DESCRIPTION OF SYMBOLS 1... Communication path, 24... Bearing, 26... Spring washer (elastic member), 27... Gland (positioning member), 28... Spring washer (biasing means)
, 34... Gasket plate, 35... Bolt (tightening means), 36... Dog joint. Patent applicant: Sato Vacuum Machinery Co., Ltd. (and 2 others)

Claims (1)

[Claims] A plurality of oil-less pump units are installed in the axial direction, each consisting of a cylinder block that accommodates a rotor, and a pair of end plate blocks that have bearings that support the shaft of the rotor and are disposed on both sides of the cylinder block. The units are arranged in series, and the plurality of units are tightened in the axial direction by a tightening means, so that the cylinder block and end plate block of each pump unit, as well as the adjacent end plate blocks, are brought into airtight contact with each other. forming a communication path that communicates the exhaust ports and suction ports of adjacent pump units with each other across the plane, and interconnecting the shaft ends of the rotors of the adjacent pump units with a removable shaft coupling; An elastic member is interposed between the shaft ends, and a positioning member disposed in the end plate block applies the thrust force of one of the pair of shafts extending outwardly of the pair of rotors located at both left and right ends. 1. A multistage oilless vane pump characterized in that the other shaft is supported by a shaft and the other shaft is biased inward by a biasing means.