CN2202204Y

CN2202204Y - Double-stage rotary vane vacuum pump

Info

Publication number: CN2202204Y
Application number: CN 94238594
Authority: CN
Inventors: 王厚贵
Original assignee: Individual
Current assignee: Individual
Priority date: 1994-04-26
Filing date: 1994-04-26
Publication date: 1995-06-28
Anticipated expiration: 2004-04-26

Abstract

The utility model relates to a double-stage rotary vane type vacuum pump. The utility model is characterized in that an air inlet faucet is arranged on the upper wall of an air inlet cavity through a penetrating mode; a filtering element is arranged in the air inlet cavity and is separated from the air inlet faucet; the filtering element is composed of a cylindrical filtering body with an open end and a close end and a filtering net sheathed on the circumferential wall of the filtering body; the open end of the filtering body is communicated with the inlet of a pump body; a plurality of radial through holes are arranged on the circumferential wall of the filtering body; annular oil grooves with the same diameter as a rotor and with a driving shaft line as the central line are arranged on the opposite bottoms of a first stage and a second stage inner cavities; an oil faucet gas ballast is also provided. As a result, foreign matter can be prevented from directly falling into the pump cavity, so that the vacuum degree and the pimping ability of the vacuum are enhanced, and the utility model also has the advantages of convenient maintenance and long service life.

Description

Double-stage rotary vane vacuum pump

The utility model relates to a kind of vacuum pump, specifically, relates to a kind of twin-stage rotary-vane vaccum pump.

Present various twin-stage rotary-vane vaccum pumps that use, its inlet air filtration net generally is the upper and lower part that is directly arranged in air inlet nozzle, and air inlet nozzle is set directly at and is connected with its import on the pump housing; Fig. 1 illustrates a kind of arrangement commonly used, and as shown in the figure, air inlet nozzle 37 directly is communicated with the pump housing 1, and filter screen 31 is located at the upper inlet place of air inlet nozzle 37; Adopt this conventional construction, particle foreign material 38 are easy to leak filter screen and directly enter in the active chamber of the pump housing 1, will make the pumping speed degree of vacuum pump slow like this, ultimate vacuum reduces, and even more serious is can make pump kill or make damage of components in the pump; In addition, in traditional twin-stage rotary-vane vaccum pump structure, in case being impurity, stops up when influencing oil-feed by the oil inlet pipe in the fuel tank, just can eliminate impurity work after just need entirely dismantling fuel tank, if have steam to cause degree of vacuum to reduce and must in time remove the time and assemble in the pump chamber, because steam merges usually in oil, it could be drained fully after therefore must draining oil fully, thereby very inconvenient; Have again, traditional pump body structure processing technology complexity (as shown in Figure 2), the pump hole bottom surface 39,40 relative with each rotor bottom and the perpendicularity of rotor axis are difficult to assurance, thereby influence the cooperating precision of rotor and pump housing inner chamber.

The purpose of this utility model provides a kind of degree of vacuum height, pumping speed is fast, noise is low, can guarantee the processing geometric accuracy, maintenance service is convenient and the twin-stage rotary-vane vaccum pump of long service life.

The purpose of this utility model realizes by following proposal.This through improved twin-stage rotary-vane vaccum pump, mainly comprise:

One is provided with the pump housing of two-stage inner chamber and mesospore and import and export runner; With the eccentric two-stage rotor that is provided with of described pump inner chamber; Front and rear cover; But two pairs respectively the gap be embedded at the blade of reverse slide on the rotor; Be arranged on the fuel tank on the pump housing upper-end surface, in be provided with two inner chambers, one of them is an exhaust cavity, also is provided with an exhaust nozzle, two exhaust valve parts and oil inlet pipe; And inlet air filtration parts and air inlet nozzle, be characterized in:

Another inner chamber of described fuel tank is an air-inlet cavity, and described air inlet nozzle is arranged on the upper wall of the air-inlet cavity relative with the import of the pump housing first order and with air-inlet cavity and is connected; Described filter element is directly relative with described first order import and be located in the described air-inlet cavity communicatively, it comprises: a cylindrical shape filter and that contains opening end and closed end on the other side is set in the filter screen on the periphery wall of described filter, the opening end of filter is installed on the air-inlet cavity diapire and is connected with the first order import of the pump housing, and its peripheral wall is provided with a plurality of radial direction through hole; The relative bottom in described first and second grade of pump housing chamber be provided with the transmission axis be center line with the isodiametric ring oil groove of rotor; It also comprises:

One is arranged on oil nozzle gas ballasting on the pump housing exhaust sidewall perpendicularly with second level outlet, comprises that an oil inlet hole and that is communicated with the pore and the second level outlet of described oil inlet pipe respectively places the one-way valve in the oil inlet hole left end.

Adopt above-mentioned improvement project of the present utility model, have following advantage:

Because fuel tank is directly brought valve into, and filter parts and air inlet nozzle are located in the air-inlet cavity of air inlet nozzle below dividually, therefore the impurity in the system can directly not enter in the pump hole, and can only accumulate in around filter end face and filter (filter screen) root, thereby having avoided existing twin-stage rotary-vane vaccum pump that impurity is directly entered effectively causes pump to kill or make its inner components damage problem that prolonged the working life of pump in the pump chamber; In addition, adopted oil intake nozzle gas ballasting structure, it both can make gas ballasting, can send oil to the secondary vestibule again, if impurity stops up oil inlet hole, can be removed as long as then take off it, and not need as existing vacuum pump, entirely pull down fuel tank just can carry out, if assemble when having water vapour to drain in the pump hole, can allow it drain as long as open one-way valve, thereby can guarantee degree of vacuum effectively, maintaining simultaneously is very convenient; In addition, owing to be respectively equipped with and the isodiametric ring oil groove of the concentricity line of rotor in the two endoporus bottom relative respectively with rotor, therefore add the tool withdrawal groove that can be used as the processing pump housing rotor circular hole part man-hour, and guaranteeing the perpendicularity and the precision thereof of bottom surface, pump hole and rotor axis.

Now further specify the purpose of this utility model and characteristics by a specific embodiment and in conjunction with its accompanying drawing.

The structural representation that Fig. 1 is connected with the pump housing for the air inlet nozzle that has the twin-stage rotary-vane vaccum pump now;

Fig. 2 is the longitudinal section of the pump housing of Fig. 1;

Fig. 3 is an embodiment's of a twin-stage rotary-vane vaccum pump of the present utility model plan view;

Fig. 4 removes fuel tank for Fig. 3 after the plan view that part is cut open;

Fig. 5 is the longitudinal section along Fig. 3 " B-B ";

Fig. 6 for dissect along Fig. 4 " E-E " and half-twist after the sectional elevation of gained;

Fig. 7 for dissect along Fig. 4 " F-F " and half-twist after the sectional elevation of gained;

As shown in the figure, twin-stage rotary-vane vaccum pump of the present utility model comprises: the pump housing 1, it is provided with the first order (senior) chamber 2 and chamber, the second level (rudimentary) 3 along same axis, and with described first, the mesospore 4 that secondary chamber separates, described

chamber

2,3 axis on vertical longitudinal plane relatively transmission journal offset one see Fig. 6 apart from d(, 7), also be provided with: on mesospore, form with transmission shaft (not shown) coaxial line ground, be communicated with first, secondary chamber 2, a bearing hole 5 of 3, respectively with described first, secondary chamber 2, first of 3 connections, secondary import 6,6 ' and first, secondary outlet 7,7 ' (see Fig. 4,6,7), one in pump housing upper wall, be communicated with described first order outlet 7 and second level import 6 ' runner 41; One front cover 8 and a rear end cover 9 are connected in the front/rear end of the pump housing respectively hermetically; One first order rotor 10 and a second level rotor 11, have the axis same with transmission shaft, be provided in accordingly respectively in first and

second grade chamber

2,3, they are provided with the

square perforation

12,13 of a prolate along separately a diameter direction respectively, the axle journal that can rabbet mutually 14,15 that forms respectively in the relative inner end of two rotors is bearing in the described bearing hole 5, and the supporting axle head 16,17 in their outside is bearing in respectively in described forward and backward end cap 8,9 bearing holes; Two pairs of blades 18,19, and 18 ', 19 ', wherein each is to all being provided in the square perforation 12 of described prolate with gap, in 13, their relative inner end is respectively equipped with axial blind hole 20,21 and 20 ' 21 ', two springs 22,23 are embedded respectively in described corresponding blind hole, so that at rotor 10, during 11 rotary works, two groups of blades 18,19 and 18 ', 19 ' under the acting in conjunction of the spring force of centrifugal force, along the square perforation 12 of prolate, 13 oppositely outwards slide and maintenance and chamber 2 each other, 3 chamber wall is conflicted all the time, thereby pump chamber is divided into two active chambers, the volume of one of them constantly enlarges to suck gas, another volume then constantly dwindles with continuous pressurized gas and with it discharges, and finishes the working procedure of bleeding (as Fig. 6, shown in 7 the arrow); One fuel tank 24; Envelope is located on the upper-end surface of the pump housing 1, has two inner chambers 25,26 separated from each other, and one of them inner chamber 25 flows out for exhaust for exhaust cavity; One exhaust nozzle 27 is arranged on exhaust cavity 25 1 sides by on the wall on the fuel tank at 2 positions, first order chamber; Two exhaust valve parts 28,28 ', be arranged on the diapire of exhaust cavity 25 of fuel tank 24 with first and second grade outlet 7,7 ' relatively respectively; One oil inlet pipe 29 vertically is arranged on the diapire of contiguous second level outlet side of exhaust cavity 25; And a filter element and an air inlet nozzle 37; Be characterized in that another chamber 26 of described fuel tank 24 is an air-inlet cavity, described air inlet nozzle 37 is arranged on the upper wall of the air-inlet cavity 26 relative with the first order import 6 of the pump housing 1 and with air-inlet cavity 26 and is connected; Described filter element is directly relative with described first order import 6 and be located at communicatively in the described air-inlet cavity 26, it comprises: have a cylindrical shape filter 30 of an opening end and a closed end on the other side and be set in a filter screen on the described filter periphery wall, its periphery of the opening end of described filter 30 can be provided with screw thread, revolve and be located on the fuel tank air-inlet cavity diapire, be connected with the first order import 6 of the pump housing, its peripheral wall is provided with a plurality of radial direction through hole; Be respectively equipped with on the flat relatively side in first and

second grade chamber

2,3 of the described pump housing 1 with the transmission axis be center line, with rotor 10,11 isodiametric

ring oil grooves

32,33; Also have additional an oil nozzle gas ballasting 34, be located on the exhaust sidewall of the pump housing 1 with second level outlet 7 ' perpendicularly, include one respectively with the oil inlet hole 35 of oil inlet pipe 29 pores and second level outlet 7 ' be connected with place a one-way valve in oil inlet hole 35 left ends, this one-way valve is made up of a gas ballasting spring 36 and steel ball 42.

When bleeding work, transmission shaft drives twin-stage rotor 10,11 rotations, be sucked gas by at Fig. 4 from seal container (not shown), 6, direction in 7 shown in the arrow flows: cross air inlet nozzle 37 earlier and flow in the fuel tank air-inlet cavity 26, walk around the circumferential of filter parts through the bending back wall, set radial direction through hole flows into the filter inner chamber and is inhaled in the first order chamber 2 through first order import 6 on the perisporium by filter screen 31 comfortable filter 30, because blade 18,19 and 18 ', 19 ' by rotor 10,11 drive, the gas that sucks is discharged by first order outlet 7 after compression, a part is through outlet valve 28, exhaust cavity 25 is discharged from exhaust nozzle 27, and the 41 inflow second level imports 6 of another part process runner ', in chamber, the second level 3 more after compression, through second level outlet 7 ' outlet valve 28 ', exhaust cavity 25 is discharged from exhaust nozzle 27 at last; So constantly carry out periodic duty so that obtain needed degree of vacuum.

Fig. 1 is air inlet nozzle and a pump housing connection diagram in the existing twin-stage rotary-vane vaccum pump, as shown in the figure, because filter screen 31 directly is seated in air inlet nozzle 37 upper inlet places (having plenty of its underpart of placing inlet), like this, granule foreign 38 is easy to directly be sucked in the pump chamber, its result causes the pumping speed degree slow, and degree of vacuum reduces, and more seriously makes pump kill or damage component in the pump; After adopting improvement structure of the present utility model, clearly, in pumping process, impurity is after entering air inlet nozzle 37 and arriving air-inlet cavity 26, only can be trapped in around the top and root thereof of filter 30, and can not be brought in the pump chamber, thereby guarantee pump safe and reliable work, improve the vacuum draw ability and increase the service life.

Claims

1, a kind of twin-stage rotary-vane vaccum pump, it comprises:

One is provided with the pump housing of two-stage inner chamber and mesospore and import and export runner; With the eccentric two-stage rotor that is provided with of described pump inner chamber; Front and back, end cap; But two pairs respectively the gap be embedded at the blade of reverse slide on the rotor; Be arranged on the fuel tank on the pump housing upper-end surface, be provided with two inner chambers in it, one of them is an exhaust cavity, also is provided with an exhaust nozzle, two exhaust valve parts and oil inlet pipe; And inlet air filtration parts and air inlet nozzle, it is characterized in that:

Another inner chamber of described fuel tank is an air-inlet cavity, and described air inlet nozzle is arranged on the upper wall of the air-inlet cavity relative with the import of the pump housing first order and with air-inlet cavity and is connected;

Described filter element is directly relative with described first order import and be located in the described air-inlet cavity communicatively, it includes: a cylindrical shape filter and that contains opening end and closed end on the other side is set in the filter screen on the external perisporium of described filter, the opening end of filter is installed on the air-inlet cavity diapire and is connected with the import of the pump housing first order, and its peripheral wall is provided with a plurality of radial direction through hole;

First and second of the described pump housing grade inner chamber relatively the bottom be provided with the transmission axis be center line with the isodiametric ring oil groove of rotor;

It also comprises: an oil nozzle gas ballasting that is provided with perpendicularly with second level outlet on pump housing exhaust side has an oil inlet hole and that is communicated with oil inlet pipe pore and second level outlet respectively and places one-way valve in the oil inlet hole left end.

2, twin-stage rotary-vane vaccum pump as claimed in claim 1 is characterized in that, the mode that sets firmly of the opening end of described filter and the air-inlet cavity diapire of fuel tank is for being threaded.

3, twin-stage rotary-vane vaccum pump as claimed in claim 1 or 2 is characterized in that, described one-way valve is made up of a gas ballasting spring and a steel ball.