CN2193941Y

CN2193941Y - Helical rotor vacuum pump

Info

Publication number: CN2193941Y
Application number: CN 94240661
Authority: CN
Inventors: 孙启本; 王金聚
Original assignee: ZHUCHENG CITY PAPER MACHINERY PLANT
Current assignee: ZHUCHENG CITY PAPER MACHINERY PLANT
Priority date: 1994-06-05
Filing date: 1994-06-05
Publication date: 1995-04-05
Anticipated expiration: 2004-06-05

Abstract

The utility model discloses a screw rotor vacuum pump. Two tooth cycloidal tooth profiles or circular arc or involute type tooth profiles which are respectively in the shape of a herringbone are supported and engaged in parallel on a machine body (1). The utility model works through the transmission of a gear wheel (5), a gear ring (8) and a gear wheel hub (6). Therefore, the efficiency of the vacuum pump is improved to nearly 2 times, and the rotation speed is also directly connected with a motor with 4-6 electrodes. The utility model whose maximal vacuum degree can reach to 100KPa has the advantages of land area occupation reduction, manufacturing cost saving, electricity-saving by more than 60%, stable transmission, continuous work, no gas blocking phenomenon and low noise. The utility model is widely suitable for vacuum dewatering in paper industry, chemical industry, food industry and sugar industry. The utility model is especially an ideal vacuum obtaining device in paper industry.

Description

Helical rotor vacuum pump

The utility model relates to a kind of pumping equipment, and promptly a kind of Roots pump exactly is a kind of helical rotor vacuum pump.

Usually the class that has of usefulness is a Nash hytor in existing technical field, and this type of pump belongs to the coarse vacuum pump, and it is outmoded that such pump has structure, and efficient is low, shortcomings such as power consumption height, and noise is big, working life is short, and runnability is poor.An other class Roots pump is two vane vacuum pumps, although it is higher that this type of pump has efficient than water ring type structure, energy-conservation and to have the body kind little, lightweight characteristics, but still it is poor to exist vacuum effectiveness, galloping, particularly two blades bump is serious in the using process, working life is short, the precision property retentivity is poor, usually hinder for some reason and influence ordinary production, exist poor for applicability, air-breathing discontinuous shortcoming, for being suitable for the modern industry demand, producers such as Shanghai No.2 Light Industry Machinery Plant have developed four leaf helical rotor vacuum pumps, be by two helical rotor engagements that rotation direction is opposite, lean on the gear driven of end and lean on the volume-variation of the work cell sky that is produced in the rotor engaged process to produce the effect of suction and pumping gas, thereby finish vacuum, this pump, because the defective in the rotor design itself, it is poor to exist the sealing of the rotor and the pump housing, and make the lost of life of pump owing to helical rotor engagement produces axial force in the working procedure, make rotor one end serious wear simultaneously, and an other end produces big gap and influence the vacuum pump performance.Particularly the sealing that is between circular arc type or these two kinds of its rotors of line style of involute of rotor flute profile is line contact sealing, and sealing effect is poor, and involute exists simultaneously and is stranded the gas phenomenon, causes power consumption height, phenomenon that operating noise is big.

The purpose of this utility model just is that design provides a kind of and both had that runnability and precision stability are good stably, long service life, do not have axial force and have axial clearance and rotor between clearance seal good, a kind of helical rotor vacuum pump that structural volume is little, efficient is high, rotating speed is high, noise is little, electricity saving performance is good.

The utility model is to realize by following technological scheme, by body (1) as body supports, the bearing support (9) that is enclosed within two rotor hole two ends on the body (1) by edge on it is supporting two main shafts that are arranged in parallel (7) and driven shaft (15) by bearing (11) respectively, protecgulum (14) and bonnet (2) are pushed down the also axial position of fixed bearing block (9), main shaft (7) stretches out front cover (14) and exposes the joining end that joins with power, bonnet (2) supports and passes main shaft (7) and driven shaft (15), bearing support (9), there is axle to pass the position on protecgulum (14) and the bonnet (2) and is respectively equipped with seal oil ring (10), (12), the end that diaxon stretches out bonnet (2) is equipped with transferring power and meshed gears respectively, and connect with bonnet (2) and body (1) and seal by gear cover (3), its structural feature is to wear two body symplex structures about helical rotor (13) is divided into again on the helical rotor (13) of 2 to 8 helical tooths and (16) main shaft (7) respectively at main shaft (7) and driven shaft (15) between the inner diaxon bearing in body (1) helical rotor hole (9), make single helical rotor two bodies be symmetrically distributed into the man type tooth-shape structure, and helical rotor (16) about two bodies with two body rotor portions of corresponding helical rotors (13) respectively, engagement is the opposite herringbone structure of rotation direction, go up symmetry at driven shaft (15) and wear, and mesh with helical rotor (13); Body (1) is gone up corresponding helical rotor (13) and (16) engaging position, is provided with respectively two of rotor left and right end portions to enter to inhale hole (18) and be positioned at the other side symmetry of body (1) perpendicular to helical rotor (13) and (16) and advance the central outlet (19) of suction inlet (18); The gear engagement that main shaft (7) and driven shaft (15) rear end connect firmly, one of them makes gear ring (6) and gear hub (8) two bodies, to adjust because of engaging gear being adjusted fixing in the helical rotor engaging position.

Structural feature of the present utility model is that helical rotor (13) and helical rotor (16) are the cycloidal profile screw type tooth of 2-8 tooth or circular arc type and involute profile screw serrated form symmetry herringbone structure.

Helical rotor of the present utility model (13), (16) is characterized in that leaving at the helical tooth top one and littlely are higher than the substantial linear tooth top and the radius of curvature sealing protruding band (20) identical with body (1) upper rotor part hole.

Structure characteristic of the present utility model is that helical rotor (13), (16) are four tooth cycloidal profile helical tooths, and its split left and right rotor is 90 ° of helix angles.

Structure characteristic of the present utility model is that driving gear (5) that main shaft (7) or driven shaft (15) link is for integral cylindrical gear or be divided into one thick one two thin body cylindrical gearss and be through on the axle head side by side, be between the two body gears and can differ from position fine setting and connect, so that eliminate drive gap with gear ring gear (6).

Advantage of the present utility model is and has type now and compare and have high speed running performance, can directly join 4-6 utmost point motor, rotating speed is existing more than 2 times of type, flow doubles with power motor for existing type, maximum vacuum can reach more than the 100KPa, power saving rate is more than 60%, the model structure compactness, take up an area of and reduce more than 60%, user's font structure has been eliminated axial force, helical rotor adopts curved surface sealing altogether in distress, life-span and sealability are further improved, solved tired gas phenomenon simultaneously, stable drive, noise is low, can be widely used in papermaking, chemical industry, a kind of desirable pumping equipment of the vacuum dehydration of food and sugar industry, particularly paper industry.

Now contrast accompanying drawing and describe specific embodiment of the utility model in detail:

Fig. 1 is a plan view of the present utility model;

Fig. 2 is a left view of the present utility model;

Fig. 3 is the cross sectional view of helical rotor of the present utility model (13), (16);

Among the figure: 1 body, 2 bonnets, 3 gear covers, 4 suction connect dish, 5 spur gears, 6 gear rings, 7 main shafts, 8 gear hubs, 9 bearing supports, 10 seal oil rings, 11 bearings, 12 seal oil rings, 13 helical rotors, 14 protecgulums, 15 driven shafts, 16 helical rotors, 17 suction and connect dish, 18 and advance suction inlet, 19 central outlet, the protruding band of 20 sealings.

The utility model is finished by following structure, body (1) is a Casting Mechanism, have two parallel helical rotor holes on it, its rear portion be positioned at the rotor hole two ends advance suction inlet (18), and connection connects dish for single port suction, front end be positioned at central outlet (19) main shaft (7) at its middle part and driven shaft (15) wearing respectively corresponding teeth engagement about the four tooth helical rotors of man type flank profil of two body rotors composition, (13) (16) also use two end axles bearing (9) to support respectively, its outside two ends are used protecgulum (14) and bonnet (2) axial restraint respectively, the gear that main shaft (7) and driven shaft (15) rearward end link is a meshing transmission structure, wherein main shaft (7) first line of a couplet follow gear ring (8) and (8) two compositions of gear hub can be around the structure of axle fine setting, rear teeth wheel cover (3) connects with bonnet (2); Front-end of spindle exposes protecgulum (14) and is provided with the power coupling head, by the motor direct connection.

Claims

1, a kind of helical rotor vacuum pump, by body (1) as body supports, the bearing support (9) that is enclosed within two rotor hole two ends on the body (1) by edge on it is supporting two main shafts that are arranged in parallel (7) by bearing (11) respectively, and driven shaft (15), protecgulum (14) and bonnet (2) are pushed down the also axial position of fixed bearing block (9), main shaft (7) stretches out front cover (14) and exposes the joining end that joins with power, bonnet (2) supports and passes main shaft (7) and driven shaft (15), bearing support (9), there is axle to pass the position on protecgulum (14) and the bonnet (2) and is respectively equipped with seal oil ring (10) (12), the end that diaxon stretches out bonnet (2) is equipped with transferring power and meshed gears respectively, and connect firmly by gear cover (3) and bonnet (2) and body (1) and to connect and to seal, it is characterized in that between the inner diaxon bearing in body (1) helical rotor hole (9) main shaft (7) and driven shaft (15) are wearing helical rotor (13) and (16) of 2-8 helical tooth respectively, two body symplex structures about main shaft (7) upper rotor part (13) is divided into again, make single helical rotor two bodies be symmetrically distributed into the man type tooth-shape structure, the two body rotor portions engagement that two bodies are then distinguished corresponding helical rotor (13) about two helical rotors (16) is the opposite herringbone structure of rotation direction, goes up symmetry at driven shaft (15) and wears and mesh with helical rotor (13); Body (1) is gone up corresponding helical rotor (13) and (16) engaging position and is provided with and is provided with two respectively at the helical rotor two end part and enters to inhale hole (18) and be positioned at the other side symmetry of body (1) perpendicular to helical rotor (13) and (16) and advance the central outlet (19) of suction inlet (18); The gear engagement that main shaft (7) and driven shaft (15) bonnet connect firmly, one of them makes gear ring (6) and gear hub (8) two bodies.

2,, it is characterized in that helical rotor (13) and helical rotor (16) symmetrical herringbone structure for the cycloidal profile screw type tooth of 2-8 tooth or circular arc type and involute profile spiral flute profile according to the described a kind of helical rotor vacuum pump of claim 1.

3, according to claim 1 or 2 described a kind of helical rotor vacuum pumps, the helical tooth top that it is characterized in that helical rotor (13), (16) leave one little be higher than the substantial linear tooth top and curvature half through the sealing protruding band (20) identical with body (1) upper rotor part hole.

4, according to claim 1 or 2 described a kind of helical rotor vacuum pumps, it is characterized in that helical rotor (13), (16) they are four flute profile cycloidal profile helical tooths, its split left and right rotor is 90 ° of helix angles.

5, according to claim 1 or 2 described a kind of helical rotor vacuum pumps, it is characterized in that driving gear (5) that main shaft (7) or driven shaft (15) link for integral cylindrical gear or be divided into one thick one thin two body cylindrical gearss side by side on axle, be between the two body gears and can differ from the position fine setting and connect.