CN115929636A - Double-head symmetrical molded line composite screw vacuum pump and working method thereof - Google Patents

Abstract

The invention relates to a double-head symmetrical profile compound screw vacuum pump and its working method. The cooling effect of the existing vacuum pump is poor, and the cooling structure is complicated. The invention includes a drive motor, a gear box, a pump casing, a left rotor, a right rotor, a seal, a bearing and a single cooling tube. Both ends of the left rotor are rotatably installed in the pump casing through the seal and the bearing. Both ends of the rotor are rotatably installed in the pump casing through seals and bearings, the right rotor and the left rotor are matched, the cooling single pipe is fixed in the pump casing, the driving motor, the gear box and the pump casing are fixed in sequence, and the left The rotor and the right rotor are respectively connected to the driving gear and the driven gear of the gearbox, which is characterized by: it also includes a coupling, a cooling pipe and a cooling block, and the drive motor, coupling, driving gear and left turn The subs are connected in turn, the cooling block is fixed around the pump casing, and the cooling pipe is fixed on the cooling block. The invention has the advantages of simple structure, small motor runout and good cooling effect of the pump shell.

Description

A double-head symmetrical profiled screw vacuum pump and its working method

technical field

The invention relates to a double-head symmetrical profile compound screw vacuum pump and its working method, belonging to the technical field of power equipment.

Background technique

A vacuum pump refers to a device or device that draws a medium from a container and compresses it to obtain a vacuum. At present, vacuum pumps are widely used in electric power, petrochemical, pharmaceutical, plastic, medical equipment and other industries. The commonly used vacuum pumps usually have the following problems: the motor is connected to the rotor through the middle support, and the vibration of the motor is too large, which affects the vacuum effect; the cooling effect of the water jacket of the cooling shell is poor, and the pump shell is prone to rust after cooling for a long time trace.

There are also technologies using other cooling methods. For example, the patent application with the publication number WO2012176991A2 published on December 27, 2012 discloses a screw-type vacuum pump with a direct cooling device. The cooling structure of the vacuum pump is complicated. Another example is that the publication date is October 29, 2009, and the patent application publication number is KR1020090112884A, which discloses a screw vacuum pump. The first coolant chamber of the screw vacuum pump is formed in the housing to cool the heat generated by gas compression. , the second coolant chamber is formed in the middle cover to cool the heat of the bearing generated by the rotation of the shaft, and the cooling structure is complicated.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art, and to provide a double-head symmetrical profile compound screw vacuum pump with simple structure, reasonable design, small motor runout, and good cooling effect on the pump casing and its working method.

The technical solution adopted by the present invention to solve the above-mentioned problems is: the double-head symmetrical profiled screw vacuum pump includes a driving motor, a gear box, a pump casing, a left rotor, a right rotor, a seal, a bearing and a single cooling tube. The top and bottom of the pump casing are provided with an air inlet and an exhaust port respectively, both ends of the left rotor are rotatably installed in the pump casing through seals and bearings, and both ends of the right rotor pass through Seals and bearings are rotatably installed in the pump housing. The right rotor and the left rotor cooperate. Bearings and seals are installed in the pump housing to support and fix the two rotors (left rotor and right rotor). The bearings Realize the high-speed operation of the left rotor and the right rotor, and the seal effectively isolates the lubricating oil from entering the pump casing; there is a small gap between the left rotor and the right rotor, and between the pump casing and the two rotors, so that the rotor There is no scratching effect when running at high speeds. The single cooling pipe is fixed in the pump casing, the processing difficulty of the single cooling pipe is low, and it is not easy to leak, so as to avoid the pollution caused by leakage. The driving motor, gear box and pump casing are fixed in sequence, so that The left rotor and the right rotor are respectively connected to the driving gear and the driven gear of the gearbox, and its structural features are: it also includes a coupling, a cooling pipe and a cooling block, and the driving motor, coupling, driving gear It is connected with the left rotor in sequence, the cooling block is fixed around the outer wall of the pump casing, the cooling pipe is fixed on the cooling block, the cooling block and the cooling pipe are installed around the pump casing, so that the operating temperature of the equipment can be maintained In the range of 50 ~ 120 ℃, ensure the stable operation of the machine.

Preferably, the drive motor, coupling and left rotor of the present invention are coaxially arranged.

Preferably, the left rotor and the right rotor of the present invention are composed of a screw part and a Roots part fixed to each other.

Preferably, the gear box of the present invention is provided with a gear end plate and a tooth cover plate, and the tooth cover plate is located at the end of the gear box; the inner wall of the gear end plate is also provided with a single cooling pipe.

Preferably, the pump housing of the present invention is provided with a rear end plate and a rear cover plate, the rear cover plate is located at the rear end of the pump housing, and the single cooling pipe is fixed on the inner wall of the rear end plate.

As a preference, both the screw part and the Roots part of the present invention adopt symmetrical double-head profiles, and the end surface profiles of the screw part and the Roots part both adopt symmetrical cycloid or involute compound profile structures, and the screw part The end surface profiles of the part and the Roots part can be identical or different, which can make the left rotor and the right rotor form a natural self-balancing effect. The left and right rotors are self-balancing without additional dynamic balancing. It can run at high speed, and the best operating range is 3000~10000rpm.

Preferably, the ratio of the height of the Roots part to the lead of the screw part in the present invention is 3-6, so as to obtain higher volume ratio and energy efficiency.

As a preference, the Roots part of the present invention can also adopt a twisted vane rotor structure, the lead angle of the Roots part is greater than the lead angle of the screw part, and the Roots part adopts a large lead angle to improve the suction efficiency ; The screw part adopts a small lead angle to increase the internal compression ratio and save energy. The screw part adopts an equal pitch structure and has strong dust resistance. The preferred value range of the lead angle of the Roots part is 55-90°, so as to obtain the best air intake and energy efficiency.

As a preference, the drive motor in the present invention is a water-cooled direct drive motor, and the drive motor is directly connected to the drive shaft to run, reducing motor jump, good cooling effect, long service life and low noise. And/or, the cooling block is made of aluminum alloy, which has high heat transfer performance and enhances the cooling effect. And/or, the cooling pipe is made of 304 stainless steel, which will not produce rust and increase durability.

As a preference, the Roots part 20 and the screw part 19 on the left rotor and the right rotor of the present invention are integrated or separated, and are all made of alloy steel to improve strength and stability during high-speed operation .

The working method of the double-head symmetrical profile compound screw vacuum pump of the present invention is characterized in that the steps are as follows: when the driving motor is in operation, the left rotor is driven to run at high speed through the coupling and the driving gear, and at the same time the driving gear drives the slave The moving gear drives the right rotor to run synchronously, and the medium is sucked in from the air inlet of the pump casing. After the left rotor and the right rotor rotate and do work, the medium is compressed through the Roots part and the screw part, and the exhaust gas is discharged from the pump casing. The outlet discharges the medium.

Compared with the prior art, the present invention has the following advantages and effects: 1. The rotor of the double-head symmetrical composite screw used in the present invention effectively improves the suction efficiency and internal compression ratio, is more energy-saving, and has enhanced dust resistance. 2. The present invention adopts a water-cooled direct-drive motor, which is directly connected with the driving shaft, which increases the transmission efficiency and reduces the influence of the motor beating on the vacuum effect. 3. The present invention adopts gear end plate and rear end plate for single-tube cooling, and the pump casing is cooled by adding a cooling block, which increases the efficiency of reducing the temperature of the machine, improves the overall performance of the vacuum pump, has more practicality, and makes parts processing more convenient. 4. The structure is simple, the design is reasonable, easy to maintain and repair, and the market prospect is broad.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention and/or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments and/or the prior art. Obviously, in the following description The accompanying drawings are only some embodiments of the present invention, and those skilled in the art can obtain other drawings according to these drawings without any creative effort.

Fig. 1 is a schematic diagram of the three-dimensional structure of a double-head symmetrical profile compound screw vacuum pump in an embodiment of the present invention.

Fig. 2 is a schematic diagram of the internal structure of a double-head symmetrical profile compound screw vacuum pump in an embodiment of the present invention.

Fig. 3 is a schematic view of the internal structure of the double-headed symmetrical profile compound screw vacuum pump from another perspective in the embodiment of the present invention.

In the figure: 1-drive motor, 2-gear box, 3-pump housing, 4-gear end plate, 5-rear end plate, 6-tooth cover plate, 7-rear cover plate, 8-left rotor, 9 -Right rotor, 10-Seal, 11-Bearing, 12-Gear, 13-Coupling, 14-Intake port, 15-Exhaust port, 16-Cooling single pipe, 17-Cooling pipe, 18-Cooling Block, 19-screw part, 20-Roots part, 21-driven gear.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

Example

Referring to Fig. 1 to Fig. 3, the double-head symmetrical profiled screw vacuum pump in this embodiment includes a drive motor 1, a gearbox 2, a pump housing 3, a left rotor 8, a right rotor 9, a seal 10, and a bearing 11 , a coupling 13, a single cooling pipe 16, a cooling pipe 17 and a cooling block 18, wherein the top and bottom of the pump housing 3 are respectively provided with an air inlet 14 and an air outlet 15.

Both ends of the left rotor 8 in this embodiment are rotatably installed in the pump casing 3 through the seal 10 and the bearing 11, and the left rotor 8 can rotate. Both ends of the right rotor 9 are rotatably installed in the pump casing 3 through the seal 10 and the bearing 11, and the right rotor 9 can also rotate, and the right rotor 9 and the left rotor 8 cooperate.

The left rotor 8 and the right rotor 9 in the present embodiment are all made up of the mutually fixed screw part 19 and the Roots part 20, and the Roots part 20 and the screw part 19 on the left rotor 8 and the right rotor 9 can be One-piece, or separate, all adopt alloy steel material to improve strength and stability during high-speed operation. Both the screw part 19 and the Roots part 20 of the present embodiment adopt symmetrical double-head profiles, and the end face profiles of the screw part 19 and the Roots part 20 can adopt symmetrical cycloid or involute composite profile structures, and the screw part 19 The end surface profile of the Roots part 20 can be completely the same or different, which can make the left rotor 8 and the right rotor 9 form a natural self-balancing effect. The left rotor 8 and the right rotor 9 are self-balancing, no need With additional dynamic balance, it can run at high speed, and the best operating range is 3000~10000rpm. The structure of a symmetrical cycloid or an involute compound profile is clear to those skilled in the art.

In this embodiment, the ratio of the height of the Roots part 20 to the lead of the screw part 19 is preferably 3-6, so as to obtain higher volume ratio and energy efficiency. The Roots part 20 can also adopt a twisted vane rotor structure, the lead angle of the Roots part 20 is greater than the lead angle of the screw part 19, and the Roots part 20 adopts a large lead angle to improve the suction efficiency; the screw part 19 adopts a small guide angle. The stroke angle is improved to increase the internal compression ratio and save energy. The screw part 19 adopts an equal-pitch structure and has a strong ability to resist dust. Preferably, the lead angle of the Roots part 20 ranges from 55° to 90°, so as to obtain the best air intake and energy efficiency.

The pump casing 3 of this embodiment is provided with a bearing 11 and a seal 10 for supporting and fixing the left rotor 8 and the right rotor 9, the bearing 11 realizes the high-speed operation of the left rotor 8 and the right rotor 9, and the seal 10 can effectively isolate lubricating oil from entering the pump housing 3 . Normally, there is a small gap between the left rotor 8 and the right rotor 9, and between the pump casing 3 and the two rotors, so that the rotors will not be affected by scraping when they run at high speed.

The single cooling pipe 16 of this embodiment is fixed in the pump casing 3, the processing difficulty of the single cooling pipe 16 is low, and it is not easy to leak, so as to avoid the situation of pollution caused by leakage, the driving motor 1, the coupling 13, The driving gear 12 is connected to the left rotor 8 in sequence, and the driving motor 1 , the shaft coupling 13 and the left rotor 8 are coaxially arranged. The left rotor 8 and the right rotor 9 are respectively connected to the driving gear 12 and the driven gear 21 of the gearbox 2 .

The cooling block 18 in this embodiment is fixed around the outer wall of the pump housing 3, and the cooling pipe 17 is fixed on the cooling block 18. The cooling block 18 and the cooling pipe 17 are installed around the pump housing 3, so that the operating temperature of the equipment Keep it within the range of 50-120°C to ensure the stable operation of the machine.

The gear box 2 in this embodiment is provided with a gear end plate 4 and a tooth cover plate 6 , and the tooth cover plate 6 is located at the end of the gear box 2 ; the inner wall of the gear end plate 4 is also provided with a single cooling pipe 16 . The pump housing 3 is provided with a rear end plate 5 and a rear cover plate 7 , the rear cover plate 7 is located at the rear end of the pump housing 3 , and the single cooling pipe 16 is also fixed on the inner wall of the rear end plate 5 .

The drive motor 1 in this embodiment is a water-cooled direct-drive motor, and the drive motor 1 is directly connected to the driving shaft to run, which reduces motor jumping, has good cooling effect, long service life and low noise. The cooling block 18 is made of aluminum alloy, which has high heat transfer performance and enhances the cooling effect. The cooling pipe 17 is made of 304 stainless steel, which will not produce rust and increase durability.

The steps of the working method of the double-head symmetrical profiled screw vacuum pump in this embodiment are as follows: when the driving motor 1 is in operation, the left rotor 8 is driven to run at a high speed through the coupling 13 and the driving gear 12, and the driving gear 12 drives the driven The gear 21 rotates, and the driven gear 21 drives the right rotor 9 to run synchronously at high speed, so that the gas medium to be compressed is sucked from the air inlet 14 of the pump casing 3, and after the left rotor 8 and the right rotor 9 rotate and do work. , the medium is compressed by the Roots part 20 and the screw part 19, and the gaseous medium is discharged from the exhaust port 15 of the pump housing 3 after being compressed.

In addition, it should be noted that the specific embodiments described in this specification may be different in parts, shapes and names of parts, and the above content described in this specification is only an illustration of the structure of the present invention. All equivalent changes or simple changes made according to the structure, features and principles described in the patent concept of the present invention are included in the protection scope of the patent of the present invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in the claims. All should belong to the protection scope of the present invention.

Claims (10)

1. A double-headed symmetrical linear compound screw vacuum pump, including a drive motor (1), a gear box (2), a pump housing (3), a left rotor (8), a right rotor (9), and a seal ( 10), a bearing (11) and a single cooling pipe (16), the top and bottom of the pump casing (3) are respectively provided with an air inlet (14) and an air outlet (15), and the left rotor ( Both ends of 8) are rotatably installed in the pump casing (3) through the seal (10) and bearing (11), and both ends of the right rotor (9) are passed through the seal (10) and bearing (11) ) is rotatably installed in the pump housing (3), the right rotor (9) is matched with the left rotor (8), the cooling single pipe (16) is fixed in the pump housing (3), and the drive motor (1), the gear box (2) and the pump casing (3) are fixed sequentially, and the left rotor (8) and the right rotor (9) are respectively connected to the driving gear (12) and the slave gear of the gear box (2). On the driving gear (21), it is characterized in that it also includes a coupling (13), a cooling pipe (17) and a cooling block (18), the driving motor (1), the coupling (13), the driving gear ( 12) and the left rotor (8) are sequentially connected, the cooling block (18) is fixed around the pump casing (3), and the cooling pipe (17) is fixed on the cooling block (18). 2. The double-head symmetrical linear compound screw vacuum pump according to claim 1, characterized in that: the left rotor (8) and the right rotor (9) are both composed of mutually fixed screw parts (19) and Roots Part (20) consists of. 3. The double-head symmetrical profile compound screw vacuum pump according to claim 2, characterized in that: the Roots part (20) adopts a twisted vane rotor structure, and the lead angle of the Roots part (20) is larger than that of the screw The lead angle of the part (19), the Roots part (20) adopts a large lead angle, the screw part (19) adopts a small lead angle, and the screw part (19) adopts an equal pitch structure, the The lead angle of the Roots part (20) ranges from 55° to 90°. 4. The double-head symmetrical profile compound screw vacuum pump according to claim 2, characterized in that: the screw part (19) and the Roots part (20) both adopt symmetrical double-head profile, and the screw part (19 ) and Roots part (20) adopt a symmetrical cycloid or involute composite profile structure, and the end faces of the screw part (19) and Roots part (20) are completely the same or different, The running speeds of the left rotor (8) and the right rotor (9) are 3000-10000rpm. 5. The double-head symmetrical profile compound screw vacuum pump according to claim 1, characterized in that: the drive motor (1), the coupling (13) and the left rotor (8) are coaxially arranged. 6. The double-head symmetrical profile compound screw vacuum pump according to claim 1, characterized in that: the gear box (2) is provided with a gear end plate (4) and a tooth cover plate (6), and the tooth cover plate (6) Located at the end of the gear box (2); the inner wall of the gear end plate (4) is also provided with a single cooling pipe (16). 7. The double-head symmetrical profile compound screw vacuum pump according to claim 1, characterized in that: the pump casing (3) is provided with a rear end plate (5) and a rear cover (7), and the rear cover The plate (7) is located at the rear end of the pump casing (3), and the single cooling pipe (16) is fixed on the inner wall of the rear end plate (5). 8 . The double-head symmetrical profile compound screw vacuum pump according to claim 2 , characterized in that the ratio of the height of the Roots part ( 20 ) to the lead of the screw part ( 19 ) is 3-6. 9. The double-head symmetrical profile compound screw vacuum pump according to claim 1, characterized in that: the driving motor (1) is a water-cooled direct drive motor, and/or the cooling block (18) is made of aluminum alloy , and/or, the cooling pipe (17) is made of 304 stainless steel. 10. A working method for a double-head symmetrical linear compound screw vacuum pump according to any one of claims 1 to 9, characterized in that the steps are as follows: when the drive motor (1) is running, it passes through the coupling ( 13) and the driving gear (12) drive the left rotor (8) to run at high speed, and at the same time the driving gear (12) drives the driven gear (21) to drive the right rotor (9) to run synchronously, and transfer the medium from the pump casing (3) The air inlet (14) is inhaled, after the left rotor (8) and the right rotor (9) rotate to do work, the medium is compressed through the Roots part (20) and the screw part (19), and the pump casing (3) The exhaust port (15) discharges the medium.

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