CN111075719A

CN111075719A - Double-helix dry-type screw vacuum pump

Info

Publication number: CN111075719A
Application number: CN201911418740.6A
Authority: CN
Inventors: 夏文龙; 华秀明; 梅玲; 张舟; 熊春林; 刘醒
Original assignee: Jiangsu High And Medium Pressure Valve Co ltd
Current assignee: Jiangsu High And Medium Pressure Valve Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2020-04-28

Abstract

The invention relates to a double-helix dry screw vacuum pump, which comprises a cylinder and a vacuum pump body, wherein the vacuum pump body is fixedly arranged in the cylinder, a rotor and a gas channel are arranged in the vacuum pump body, the rotor comprises a driving rotor and a driven rotor, the driving rotor is fixedly connected above the driven rotor, the rotor comprises a rotating shaft rod and a plurality of grinding teeth, the grinding teeth are sleeved on the outer surface of the rotating shaft rod and fixedly connected, the plurality of grinding teeth are arranged at the inner cavity of the vacuum pump body, the rotating shaft rod penetrates through the vacuum pump body, the gas channel is fixedly arranged at the gap between the two sides of the rotor and the vacuum pump body, the two ends of the vacuum pump body are respectively provided with a gas suction hole and a gas exhaust hole, the gas exhaust hole is fixedly provided with an exhaust channel outside the vacuum pump body, the exhaust channel penetrates through the bottom of the cylinder, and the two sides, compact structure, high pumping speed and high vacuum degree.

Description

Double-helix dry-type screw vacuum pump

Technical Field

The invention belongs to the technical field of screw vacuum pumps, and particularly relates to a double-helix dry-type screw vacuum pump.

Background

In 1905, german wolff roughcast, german invented an oil-sealed rotary vane pump, from which various vacuum pumps using oil as working fluid, lubricant and sealing fluid are rapidly popularized as rain spring bamboo shoots, which dominates the vacuum equipment market for nearly a hundred years, various oil vacuum pumps inevitably discharge a large amount of oil stains along with discharged gas in the working process, the oil stains seriously pollute the environment, with the development of scientific technology, many oil-free vacuum pumps rapidly develop, and from the development of the vacuum pump market in the 21 st century, on the basis of the researches on the aspects of line meshing characteristic, rotor stress deformation, thermal expansion and the like, a new high-efficiency molded line is created to ensure simple molded line processing, large sealing volume between teeth, small leakage triangle, large pumping speed, high pumping efficiency, and relatively slow development of a dry pump compared with a molecular pump, although the existing dry screw vacuum pump has high reliability, The dry type screw vacuum pump has the advantages of convenience in operation and maintenance, good power balance, strong adaptability, multiphase mixed transportation, no cough and shake phenomenon and the like, but has the main defects that the tooth surface of a screw rotor is a space curved surface, a special cutter and a special machine tool are required to be utilized, the manufacturing process is complex, the requirement on the sealing degree of each working cavity such as a cylinder is high, the requirement on the processing precision is high, the manufacturing cost is high, a lot of difficulties are brought to practical application, the popularization and the utilization are difficult, and the dry type screw vacuum pump is difficult to popularize and utilize because the dry type screw vacuum pump depends on gap sealing gas, and the dry type screw vacuum pump has excellent performance only when the volume flow is larger than 0.2 square meter/minute generally at present, so the dry type screw vacuum pump.

Disclosure of Invention

The invention provides a double-helix dry screw vacuum pump for solving the technical problems.

In order to solve the technical problems, the invention provides the following technical scheme:

a double-helix dry screw vacuum pump comprises a cylinder and a vacuum pump body, wherein the vacuum pump body is fixedly arranged in the cylinder, a rotor and a gas channel are arranged in the vacuum pump body, the rotor comprises a driving rotor and a driven rotor, the driving rotor is fixedly connected above the driven rotor, the rotor comprises a rotating shaft rod and a plurality of engaging teeth, the engaging teeth are embedded on the outer surface of the rotating shaft rod and fixedly connected with each other, the engaging teeth are arranged at the inner cavity of the vacuum pump body, the rotating shaft rod penetrates through the vacuum pump body, the gas channel is fixedly arranged at the gap between the two sides of the rotor and the vacuum pump body, a bearing is fixedly connected and arranged around the rotating shaft rod outside the vacuum pump body, an oil tank is fixedly arranged at the position close to the bearing at the two sides of the inner cavity of the cylinder, a plurality of bearings are arranged at the fixed connection position of the rotating shaft rod, the exhaust hole is provided with an exhaust channel outside the vacuum pump body, the exhaust channel penetrates through the bottom of the cylinder, a cooling water ring is fixedly arranged outside the cylinder, an oil seal is arranged at the fixed connection position of the driving rotor and the outside of the cylinder, and the two sides of the cylinder are respectively provided with a front shell and a rear shell through buckles.

Further, the cylinder is ∞ shaped.

Further, the driving rotor and the driven rotor are both spiral-shaped, and are parallel to each other and opposite in direction, and the plurality of the engaging teeth are meshed with each other.

Further, the suction port and the discharge port have the same shape and size.

Further, the number of the cooling water rings is two, and the cooling water rings are symmetrically arranged on two sides of the outer portion of the cylinder.

Further, one end of the rotor close to the air suction hole is provided with an air suction end face.

Further, an exhaust end face is arranged at one end, close to the exhaust hole, of the rotor.

Further, a rotating shaft rod in the driven rotor is provided with a synchronous gear at a position close to the rear shell, and the synchronous gear is fixedly connected with the rotating shaft rod at the right side of the bearing.

Compared with the prior art, the invention has the beneficial effects that:

1. in the device, the sealing volume between the teeth is improved by the arranged rotor, the leakage is small, the pumping speed is high, and the pumping efficiency is high;

2. in the device, through the matching of the air channel, the air suction hole and the exhaust hole, the flow of the fluid in the device in the pump cavity is uniform, the power balance is good, and the device has a scientific and reasonable structure and is safe and convenient to use.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of a rotor structure according to the present invention;

FIG. 3 is a schematic view of the structure of the suction end face of the present invention;

FIG. 4 is a schematic view of the exhaust end face structure of the present invention;

in the figure: the device comprises a cylinder 1, a vacuum pump body 2, a rotor 3, an active rotor 4, a passive rotor 5, a rotating shaft 6, a tooth 7, a bearing 8, an oil tank 9, a gas suction hole 10, a gas exhaust hole 11, a gas channel 12, a shaft seal 13, an oil seal 14, a gas suction end face 15, a gas exhaust end face 16, a front shell 17, a rear shell 18, a synchronous gear 19, a gas exhaust channel 20 and a cooling water ring 21.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative efforts based on the embodiments of the present invention belong to the protection scope of the present invention.

Referring to fig. 1, fig. 2, fig. 3 and fig. 4, the present invention provides a technical solution:

a double-helix dry screw vacuum pump comprises a cylinder 1 and a vacuum pump body 2, the vacuum pump body 2 is fixedly arranged in the cylinder 1, a rotor 3 and a gas channel 12 are arranged in the vacuum pump body 2, the rotor 3 comprises a driving rotor 4 and a driven rotor 5, the driving rotor 4 is fixedly connected above the driven rotor 5, the rotor 3 comprises a rotating shaft rod 6 and a plurality of grinding teeth 7, the grinding teeth 7 are fixedly embedded on the outer surface of the rotating shaft rod 6, the plurality of grinding teeth 7 are arranged at the inner cavity of the vacuum pump body 2, the rotating shaft rod 6 penetrates through the vacuum pump body 2, the gas channel 12 is fixedly arranged at the gap between the two sides of the rotor 3 and the vacuum pump body 2, a bearing 8 is fixedly connected around the rotating shaft rod 6 outside the vacuum pump body 2, an oil tank 9 is fixedly arranged at the position close to the bearing 8 at the two sides of the inner cavity of the cylinder, suction port 10 and exhaust port 11 have been seted up respectively to 2 both ends of vacuum pump organism, exhaust port 11 is equipped with exhaust passage 20 at 2 external fixation of vacuum pump organism, exhaust passage 20 runs through cylinder 1 bottom, 1 external fixation of cylinder is provided with cooling water ring 21, initiative rotor 4 is provided with oil blanket 14 with 1 external fixation of cylinder department, 1 both sides of cylinder are provided with anterior shell 17 and rear portion shell 18 respectively through the buckle, this device spare part is few, power balance is good, moreover, the steam-pumping speed is big, the vacuum is high, can arrange the atmosphere directly, no friction between the working unit, long service life, self-priming capability is strong, do not have the vulnerable part.

In the present embodiment, the cylinder 1 is ∞ shaped.

In this embodiment, the driving rotor 3 and the driven rotor 4 are both helical, when the two rotors are meshed with each other, X2= X2 (T, ψ 1 (T)), Y2= Y2 (T, ψ 1 (T)), f (T, ψ 1) =0, and the two rotors are parallel to each other and opposite in direction, several mesh teeth 7 are meshed with each other, the helix angle between the mesh teeth 7 and the rotating shaft 6 is T =2 π Rcot β, the tightness between the rotors can obtain a higher-quality vacuum, and gaps are left between tooth faces, which can resist liquid impact, and can transport other liquids, gases, etc.

In this embodiment, the shape and size of the suction port 10 and the exhaust port 11 are the same, no surge, and continuous exhaust is easily achieved, and the discharge capacity of the exhaust port 11 is: f =2 π R-F.

In this embodiment, the number of the cooling water rings 21 is two, and the cooling water rings are symmetrically arranged on two sides of the outside of the cylinder 1, so that the device is uniformly heated in the working process.

In this embodiment, a suction end face 15 is provided at one end of the rotor 3 near the suction port 10.

In this embodiment, an exhaust end face 16 is provided at one end of the rotor 3 near the exhaust port 11.

In this embodiment, the rotating shaft rod 6 of the driven rotor 5 is provided with a synchronous gear 19 near the rear housing 18, and the synchronous gear 19 is fixedly connected with the rotating shaft rod 6 at the right side of the bearing 8.

The working principle and the using process of the invention are as follows:

when the double-helix dry-type screw vacuum pump works, the air suction process is as follows: a pair of mutually meshed spiral rotors 3 are arranged in parallel in an infinity-shaped cylinder 1, wherein two tooth teeth 7 on a driving rotor 4 and a driven rotor 5 are identical in shape and opposite in rotation, the driving rotor 4 rotates anticlockwise through a rotating shaft rod 6 to drive the tooth teeth 7 on the driving rotor 4 to rotate anticlockwise, the rotating shaft rod 6 in the driven rotor 5 is driven to rotate clockwise through a synchronous gear 7, the tooth teeth 7 on the driven rotor 5 synchronously rotate clockwise, a certain shape and size of an air suction hole 10 and an air exhaust hole 11 are respectively arranged at two ends of a vacuum pump body 2, the tooth teeth 7 at one ends, close to the air suction hole 10, of the driving rotor 4 and the driven rotor 5 are completely meshed, and the volume between teeth is formed due to the fact that one ends of the tooth teeth 7 are gradually disengaged with the air suction hole 10 along with the starting rotation of the rotors 3, a certain vacuum is formed in the vacuum pump body 2, and the inter-tooth volume is only communicated with the air suction orifice 10, so that the gas flows into the gas channel 12 through the air suction orifice 10 under the action of pressure difference, the inter-tooth volume is continuously expanded and is communicated with the air suction orifice 10, when the inter-tooth volume reaches the maximum value, the inter-tooth volume cannot be increased again along with the rotation of the rotor 3, the inter-tooth volume is disconnected from the air suction orifice 10 at the position, and the air suction process is finished; the inter-tooth space volume is communicated with the exhaust port 10, that is, the exhaust process is started, and as the inter-tooth space volume is continuously reduced, the gas with the exhaust pressure is gradually exhausted through the exhaust port 11 along with the gas channel 12, and finally, the gas is completely exhausted out of the cylinder 1 along with the exhaust channel 20, and the enclosed inter-tooth space volume is zero, which is the exhaust process.

The above embodiments are preferred embodiments of the present invention, and those skilled in the art can make variations and modifications to the above embodiments, therefore, the present invention is not limited to the above embodiments, and any obvious improvements, substitutions or modifications made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims

1. The utility model provides a double helix dry screw vacuum pump, includes cylinder (1) and vacuum pump organism (2), its characterized in that: the vacuum pump is characterized in that a vacuum pump body (2) is fixedly arranged inside the cylinder (1), a rotor (3) and a gas channel (12) are arranged inside the vacuum pump body (2), the rotor (3) comprises an active rotor (4) and a passive rotor (5), the active rotor (4) is fixedly connected above the passive rotor (5), the rotor (3) comprises a rotating shaft rod (6) and a plurality of engaging teeth (7), the engaging teeth (7) are sleeved on the outer surface of the rotating shaft rod (6) and fixedly connected, the engaging teeth (7) are arranged in the inner cavity of the vacuum pump body (2), the rotating shaft rod (6) penetrates through the vacuum pump body (2), the gas channel (12) is fixedly arranged at the gaps between the two sides of the rotor (3) and the vacuum pump body (2), and a bearing (8) is fixedly connected around the rotating shaft rod (6) outside the vacuum pump body (2), the oil tank (9) is fixedly arranged at the position, close to the bearing (8), of two sides of an inner cavity of the cylinder (1), a plurality of shaft seals (13) are arranged at the fixed connection position of the bearing (8) and the rotating shaft rod (6), a gas suction hole (10) and a gas exhaust hole (11) are respectively formed in two ends of the vacuum pump body (2), a gas exhaust channel (20) is fixedly arranged outside the vacuum pump body (2) through the gas exhaust hole (11), the gas exhaust channel (20) penetrates through the bottom of the cylinder (1), a cooling water ring (21) is fixedly arranged outside the cylinder (1), an oil seal (14) is arranged at the fixed connection position of the driving rotor (4) and the outside of the cylinder (1), and a front shell (17) and a rear shell (18) are respectively arranged on two sides of the.

2. The double helix dry screw vacuum pump according to claim 1, characterized in that: the cylinder (1) is infinity-shaped.

3. The double helix dry screw vacuum pump according to claim 1, characterized in that: the driving rotor (3) and the driven rotor (4) are both in a spiral shape, are parallel to each other and are opposite in direction, and the plurality of engaging teeth (7) are meshed with each other.

4. The double helix dry screw vacuum pump according to claim 1, characterized in that: the air suction hole (10) and the air exhaust hole (11) are the same in shape and size.

5. The double helix dry screw vacuum pump according to claim 1, characterized in that: the number of the cooling water rings (21) is two, and the two cooling water rings are symmetrically arranged on two sides of the outer portion of the cylinder (1).

6. The double helix dry screw vacuum pump according to claim 1, characterized in that: and a gas suction end face (15) is arranged at one end of the rotor (3) close to the gas suction hole (10).

7. The double helix dry screw vacuum pump according to claim 1, characterized in that: and an exhaust end face (16) is arranged at one end of the rotor (3) close to the exhaust hole (11).

8. The double helix dry screw vacuum pump according to claim 1, characterized in that: a synchronous gear (19) is arranged on a position, close to a rear shell (18), of a rotating shaft rod (6) in the driven rotor (5), and the synchronous gear (19) is fixedly connected with the rotating shaft rod (6) on the right side of a bearing (8).