CN87215988U

CN87215988U - Oilless concentric type vacuum pump \

Info

Publication number: CN87215988U
Application number: CN 87215988
Authority: CN
Inventors: 王丕正
Original assignee: Individual
Current assignee: Individual
Priority date: 1987-12-07
Filing date: 1987-12-07
Publication date: 1988-08-03

Abstract

The utility model provides an oilless concentric type vacuum pump used for extracting air. The oilless concentric type vacuum pump used for extracting air is composed of three main parts of a pump body, a rotor, and vane. The inner surface of the pump body is composed of two cylindrical surfaces which have the same coaxial line and different radius. The rotor is centrically arranged inside the pump body. An air inlet and an air outlet are respectively arranged on the cylinder surface whose radius is r in the inner surface of the pump body. The air inlet and the air outlet are respectively communicated with a working chamber by a concave shape channel. The oilless concentric type vacuum pump used for extracting air can begin to extract air from the atmosphere, and can continuously work. The oilless concentric type vacuum pump used for extracting air has a high ultimate vacuum degree, and can provide a constant flow rate, can realize oilless lubricating seal, and can make the transported gas not generate oil pollution. The utility model has the advantages of small size and low cost.

Description

Oilless concentric type vacuum pump \

The utility model relates to a kind of vacuum pump of the usefulness of bleeding.

Pump the oil sealing eccentric vacuum pump that gas is used, have following shortcoming in use: (1) structurally exists the gas in " clearance space " this space to get rid of.After blade turned over relief opening, this portion gas was compressed again, got back to breathing space again through the slit between rotor and pump chamber, and the ultimate vacuum of pump is descended, and clearance space is more little, and ultimate vacuum is high more.(2) gas of carrying is produced oil pollution and have the oily vapours phenomenon of backflowing.(3) can not guarantee that extraction flow is permanent steady during the inswept selenodont of blade space.

The purpose of this utility model be a kind of no oily concentric type vacuum pump will be provided, it can begin to bleed and can continuous operation from atmosphere, and can eliminate " clearance space " on the oil sealing eccentric vacuum pump structure, improve ultimate vacuum, permanent steady flow is provided, realize Oilless Lubrication Seal in Petroleum Gas, make the gas that is transferred not produce oil pollution.

The purpose of this utility model is achieved in that no oily concentric type vacuum pump mainly is made up of the pump housing, rotor, blade three parts.The internal surface of the pump housing is that two garden cylindrical surfaces by the different radii r of coaxial line and R(r＜R) constitute.The end face of the pump housing is perpendicular to axis, concentric being configured in the pump housing of rotor, the nominal size of its radius equals r, but should leave certain clearance with internal surface, rotate flexibly to guarantee rotor, outer garden of rotor and pump housing internal surface radius are that to form a truncated annulus passage be the working room to the garden cylinder of R.Be to have inlet, outlet on the internal surface of r to communicate with the working room by one section recessed channel respectively at the radius of the pump housing.Have some longitudinal flutings on the rotor, the blade that can radially be free to slide is housed in groove, the length of blade equals the length of the pump housing, and its material is that self lubricating material is made.The arc length of working room right angle α should determine according to the number of blade, can not directly promptly should be generally 30 degree～270 degree to guarantee the air inlet recessed channel and the recessed channel of giving vent to anger always to be isolated greater than the angle between two blades on the rotor by working room's conducting by blade.

Not having oily concentric type vacuum pump has the following advantages: because rotor concentric arrangement in the pump housing, the outer garden of rotor contacts (in fact maintenance equate gap) according to the gap sealed principle of mechanical type on whole one section r garden arc with pump housing internal surface, as long as make this section r garden arc long enough, and the gap is very little, the leakage rate that just can make the gap near or equal zero.Therefore just can stop gas to backflow from relief opening, therefore " clearance space " is eliminated.During the rotor rotation, blade is skidded off from groove by centrifugal action, and blade is close on the pump housing inwall.In the working room, blade separates air inlet/outlet and the working room is divided into some little section ring-like cells, and rotor whenever rotates a circle, and each little volume that cuts ring-like cell will gradually become maximum value by minimum value, become minimum value by maximum value again, finish air-breathing, exhaust process.Because the variable quantity of volume is uniformly during the working room that blade is inswept, so kept the stable of gas flow.Blade adopts self lubricating material to make, so does not need lubricating oil filling again in the pump housing, so that the gas that is transferred does not produce oil pollution, and volume is little, the noise minor structure is simple.

The concrete structure of model utility is provided by following embodiment and accompanying drawing.

Fig. 1 is according to a kind of sectional drawing that does not have oily concentric type vacuum pump that the utility model proposes.Fig. 2 is the A-A sectional view of Fig. 1.

Do not have oily concentric type vacuum pump and comprise a pump housing (1), rotor (2), blade (3).The surface of internal cavity of the pump housing (1) is that the garden cylindrical surface of R coaxial line different radii constitutes by radius r and radius.The end face of the pump housing (2) is perpendicular to axis, garden and the pump housing (1) internal surface are to have suction port (4) and air outlet (5) on the internal surface of r and communicate with working room (8) by recessed channel (6) and (7) respectively in contact on whole one section r garden arc (in fact keep equate gap), at the pump housing (2) radius outside rotor (2) concentric configuration in the pump housing (1), the rotor (2), the arc length of working room right angle be 100 to spend.4 blades (3) are housed on the rotor (2), and its material is a graphite alloy, and when the rotor rotary work, blade is subjected to action of centrifugal force.Skid off from groove and be close on the pump housing inwall, blade separates gas-entered passageway in the working room, and rotor whenever rotates a circle, and each blade is just finished once air-breathing, exhaust process.

Claims

1, a kind of no oily concentric type vacuum pump comprises the pump housing (1) rotor (2) blade (3).Feature of the present utility model is: the internal surface of the pump housing (1) is that (two garden cylindrical surfaces of r＜R) constitute by the different radii r of coaxial line and R, what rotor (2) was concentric is configured in the pump housing (1), the nominal size of its radius equals r, and maintain certain clearance with the r internal surface of the pump housing (1), be to have suction port (4) and air outlet (5) on the internal surface of r and at the radius of the pump housing (1) by matrix passage (6), (7) communicate with working room (8), the arc length of working room (8) right angle a more than or equal to the angle between two blades on the rotor, be generally 30 degree～270 degree.

2, no oily concentric type vacuum pump according to claim 1 is characterized in that being equipped with on the rotor (2) 4 blades (3), the arc length of working room right angle α greater than 90 degree.The material of blade (3) is a graphite alloy.