CN111425395A

CN111425395A - Multi-section Roots vacuum pump beneficial to liquid drainage

Info

Publication number: CN111425395A
Application number: CN202010382345.3A
Authority: CN
Inventors: 顾倩倩
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-05-08
Filing date: 2020-05-08
Publication date: 2020-07-17

Abstract

The application discloses do benefit to multistage formula roots vacuum pump of flowing back, including the pump body and a plurality of baffles, a plurality of baffles are along pump body axis direction equipartition in the pump body, and a plurality of baffles divide into a plurality of pump sections with the pump body is internal, and every baffle is equipped with the passageway that communicates two adjacent pump sections. Therefore, the Roots vacuum pump can be used for a vertical structure, gas and liquid mixed in the gas are sucked into the pump section, when the rotor rotates, the exhaust gas of the pump section enters the gas channel in the partition plate to enter the gas inlet end of the lower pump section, and is discharged into the next pump section through the rotation of the rotor of the pump section until the exhaust gas is discharged out of the pump cavity; and through adopting the bayonet structure of segmentation baffle, simplified the pump body processing degree of difficulty, realized the miniaturization of pump size to reduce the cost of making outside pipe arrangement, and reduce the noise level of pump.

Description

Multi-section Roots vacuum pump beneficial to liquid drainage

Technical Field

The invention relates to the field of Roots vacuum pumps, in particular to a multi-section Roots vacuum pump beneficial to liquid drainage.

Background

Generally, for a roots vacuum pump, a pair of rotors rotate in a pump housing to suck and discharge gas, a gap between the rotors and the pump housing accommodating the rotors is small, and the gap between the rotors and the pump housing is as small as possible, which is very critical to achieve high performance of the pump.

Hitherto, in a high compression ratio driven multi-stage roots vacuum pump, since liquid may be sucked in during operation or liquid generated during suction cannot be discharged from a pump chamber, due to incompressibility of the liquid, the presence of the liquid may cause overload of a motor driving the pump in view of multi-stage compression characteristics of the pump, causing damage to the motor, or damage to the pump.

In the prior art, the roots vacuum pump is of a horizontal structure, in order to discharge the liquid inside, a liquid discharge channel can be led out of each section of cavity, and the liquid discharge channel is controlled by a valve.

In the technology of the existing Roots vacuum pump, a pump shell and a segmented partition wall are integrally manufactured by the pump shell, so that the pump shell is complex and has high processing difficulty, and the cooling of external cooling water on a pump cavity is not direct due to the heat generated by compression in the pump cavity and the isolation of an air passage.

If liquid remains in the pump chamber, especially if there is a potential for corrosion of the pump's constituent materials, the durability of the pump can be compromised.

Disclosure of Invention

The invention aims to provide a multi-section roots vacuum pump beneficial to liquid drainage, and solves one or more of the problems in the prior art.

According to one aspect of the invention, the multi-section Roots vacuum pump beneficial to liquid drainage comprises a pump body and a plurality of partition plates, wherein the partition plates are uniformly distributed in the pump body along the axis direction of the pump body, the interior of the pump body is divided into a plurality of pump sections by the partition plates, and each partition plate is provided with a channel for communicating two adjacent pump sections.

Therefore, the Roots vacuum pump can be used for a vertical structure, gas and liquid mixed in the gas are sucked into the pump section, when the rotor rotates, the exhaust gas of the pump section enters the gas channel in the partition plate to enter the gas inlet end of the lower pump section, and is discharged into the next pump section through the rotation of the rotor of the pump section until the exhaust gas is discharged out of the pump cavity; and through adopting the bayonet structure of segmentation baffle, simplified the pump body processing degree of difficulty, realized the miniaturization of pump size to reduce the cost of making outside pipe arrangement, and reduce the noise level of pump.

In some embodiments: the pump body includes the pump case that two are closed each other, and every pump case inner wall is equipped with a plurality of slots with baffle complex along axial direction. From this, through adopting the bayonet structure of segmentation baffle, simplified the pump body processing degree of difficulty, realized the miniaturization of pump size to reduce the cost of making outside pipe arrangement, and reduce the noise level of pump.

In some embodiments: the pump body is of a vertical structure.

In some embodiments: one side of the partition board is provided with an inlet communicated with the channel, the other side of the partition board is provided with an outlet communicated with the channel, and the inlet and the outlet are arranged in a staggered manner.

In some embodiments: the partition board is provided with a pair of shaft holes, and the inlet is positioned at the side edge of the partition board and between the pair of shaft holes; the outlet is positioned at the side edge of the back surface of the clapboard and is also positioned between the pair of shaft holes; the inlet and the outlet are respectively positioned at two sides of the pair of shaft holes.

In some embodiments: the air inlet is communicated with the uppermost pump section, and the air outlet is communicated with the lowermost pump section.

In some embodiments: one side of the exhaust port is provided with a liquid storage tank. Thereby, the liquid discharged from the pump body can be collected.

In some embodiments: the pump body is internally provided with a pump cavity cooling channel. This makes it possible to cool the inside of the pump chamber.

In some embodiments: a pair of rotating shafts is arranged in the pump body, a plurality of impellers are uniformly distributed in the axial direction of each rotating shaft, a coupler connected with the rotating shafts is arranged at the top of the pump body, the bottoms of the two rotating shafts are driven by synchronous gears, and a pump cover used for covering the synchronous gears is arranged at the bottom of the pump body; both ends all install in the pump body through the bearing about the pivot, both ends all are equipped with sealedly about the pivot.

In some embodiments: the air inlet is provided with a purging port.

Drawings

FIG. 1 is a schematic structural view of a multi-section Roots vacuum pump facilitating liquid drainage according to the present invention;

FIG. 2 is a schematic structural diagram of an embodiment of a multi-sectional Roots vacuum pump facilitating liquid discharge according to the present invention;

FIG. 3 is a cross-sectional view taken along line X-X in FIG. 2;

FIG. 4 is a cross-sectional view taken along line I-I of FIG. 2;

FIG. 5 is a cross-sectional view taken along line II-II of FIG. 2;

FIG. 6 is a cross-sectional view of III-III of FIG. 2;

FIG. 7 is a cross-sectional view of IV-IV in FIG. 2;

FIG. 8 is a cross-sectional view of V-V in FIG. 2;

FIG. 9 is a cross-sectional view taken along line VI-VI of FIG. 2;

FIG. 10 is a cross-sectional view of VII-VII of FIG. 2;

Detailed Description

The present invention will be described in further detail with reference to the following description of the drawings.

As shown in figure 1, a do benefit to multistage formula roots vacuum pump of flowing back, includes the pump body 1 and a plurality of baffle 2, and the pump body 1 is vertical structure, and a plurality of baffles 2 are along 1 axial direction equipartition in the pump body 1 of the pump body. The pump body 1 comprises two pump shells 101 which are mutually covered, and a plurality of slots which are inserted and matched with the partition plates 2 are dug in the inner wall of each pump shell 101 along the axial direction.

A plurality of baffles 2 separate pump body 1 internal portion into a plurality of pump section 3, and every baffle 2 is equipped with the passageway 4 of two adjacent pump section 3 of intercommunication.

The lower side surface of the partition board 2 is provided with an inlet 41 communicated with the channel 4, the inlet 41 is used as an air inlet of the pump section 3 below the partition board 2, the upper side surface of the partition board 2 is provided with an outlet 42 communicated with the channel 4, the outlet 42 is used as an air outlet of the pump section 3 above the partition board 2, and the inlet 41 and the outlet 42 are arranged in a staggered manner.

Specifically, the partition board 2 is provided with a pair of shaft holes, and the inlet 41 is positioned at the side edge of the partition board 2 and between the pair of shaft holes; the outlet 42 is located at the side edge of the back surface of the partition 2, also between the pair of shaft holes; the inlet 41 and the outlet 42 are located on both sides of the pair of shaft holes, respectively.

The pump further comprises an air inlet 5 and an air outlet 6, wherein the air inlet 5 and the air outlet 6 are integrally formed on the pump body, the air inlet 5 is communicated with the uppermost pump section 3, and the air outlet 6 is communicated with the lowermost pump section 3.

The pump body 1 is provided with a pump cavity cooling channel 7 inside. The interior of the pump body can be cooled.

A pair of rotating shafts 8 are arranged in the pump body 1, a plurality of impellers 9 are axially and uniformly distributed on each rotating shaft 8, a coupler 10 connected with the rotating shafts 8 in a key mode is arranged at the top of the pump body 1, the bottoms of the two rotating shafts 8 are driven through a synchronous gear 11, a pump cover 12 used for covering the synchronous gear 11 is arranged at the bottom of the pump body 1 in a covering mode, and lubricating oil can be stored in the pump cover 12; the upper and lower both ends of pivot 8 all install in the pump body 1 through bearing 14, and both ends are all overlapped and are sealed 13 about pivot 8 and seal.

The upside of the pump body 1 is provided with an air inlet side cover 15, the air inlet side cover 15 is used for sealing the pump section on the uppermost side, the downside of the pump body 1 is provided with an exhaust side cover 16, and the exhaust side cover 16 is used for sealing the pump section on the lowermost side.

The seal 13 on the air inlet side is a gas seal which is arranged on the air inlet side cover 15 and used for shaft extension; the exhaust side seal 13 is a gas seal for shaft extension mounted on the exhaust side cover 16.

The intake side bearing 14 is a rotational support for the intake side shaft, and the exhaust side bearing 14 is a rotational support for the exhaust side shaft.

The synchronizing gear 11 is used for power transmission between the two rotating shafts 8, and the pump cover 12 serves as a base of the whole pump, is located on the lower side of the exhaust side cover 16, and serves as a liquid storage tank for gear lubricating liquid.

The upper side of the air inlet side cover 15 is provided with a top cover 17, the top cover 17 is an installation fixing seat of the motor, and the power of the motor is transmitted to the rotating shaft 8 through the coupler 10.

So that the impellers 9 coupled on the rotating shaft 8 rotate synchronously, and the impellers 9 rotate in a meshing manner to complete the suction and compression of the gas.

In one embodiment, as shown in fig. 2 and 3, the partition 2 is provided with 3 partitions, including a first partition 21, a second partition 22 and a third partition 23, which respectively divide the interior of the pump body 1 into four pump sections, including a first pump section 31, a second pump section 32, a third pump section 33 and a fourth pump section 34.

As shown in fig. 4, the impeller 9 in the first pump section 31 rotates to suck the gas G01 in the passage of the gas inlet 5, and the gas G02 is formed after the rotation.

As shown in fig. 5, the gas G02 compressed by the first pump stage enters the first diaphragm 21 as the second pump stage suction gas G03.

As shown in fig. 6, the impeller 9 in the second pump section 32 rotates to suck the gas G03 in the passage of the first partition 21, and the gas G04 is formed after the rotation.

As shown in fig. 7, the compressed gas G04 of the second pumping stage 32 enters the second diaphragm 22 and becomes the suction gas G05 of the third pumping stage 33.

As shown in fig. 8, the impeller 9 in the third pump section 33 rotates to suck the gas G05 in the passage of the second partition 22, and the gas G06 is formed after the rotation.

As shown in fig. 9, the compressed gas G06 of the third pumping stage 33 enters the third diaphragm 23 and becomes the suction gas G07 of the fourth pumping stage 34.

As shown in fig. 10, the impeller 9 in the fourth pump section 34 rotates to suck the gas G07 in the channel of the third partition 23, and the gas G08 is formed after the rotation.

G08 gas is discharged into vent 6 to form gas G09, which can be forced into the partition by rotation of the impeller if liquid is present in the pump chamber and ultimately into vent 6 to form liquid S01. a reservoir can be provided at vent 6 for collecting the liquid.

The baffle is the components of a whole that can function independently structure, processes out the groove on the pump body and is used for installing the baffle, and this simple structure is convenient for process in batches, reduces manufacturing cost.

The partition plate adopts a split structure, so that the length of the partition plate of each segment can be freely determined, and the pump can be used for manufacturing pumps with various compression ratios so as to be used in occasions with different load requirements, such as different gas quantity loads maintained in a specific vacuum section by a vacuum pumping system and different pumping compression ratios. And pumps for manufacturing various pumping rates, to form a coverage of serialized product pumping rates, while using a common piece in large numbers to reduce manufacturing costs.

In addition, a purging port can be arranged at the air inlet 5, the pump cavity is purged by selecting gas flow with proper pressure before the machine is stopped, liquid in the pump cavity is assisted to be completely discharged out of the pump, and the phenomenon that the liquid is stored in the pump cavity and can be rotten or rusted on the inner part of the pump cavity is avoided; or condensation of the liquid can make restarting the pump difficult due to the pump temperature dropping after shutdown.

The above is only one embodiment of the present invention, and it should be noted that, for those skilled in the art, several similar modifications and improvements can be made without departing from the inventive concept of the present invention, and these should also be considered as within the protection scope of the present invention.

Claims

1. The utility model provides a do benefit to multistage formula roots vacuum pump of flowing back which characterized in that: including the pump body (1) and a plurality of baffle (2), a plurality of baffle (2) are followed pump body (1) axis direction equipartition is in the pump body (1), and is a plurality of baffle (2) will pump body (1) internal partitioning becomes a plurality of pump sections (3), every baffle (2) are equipped with the intercommunication adjacent two passageway (4) of pump section (3).

2. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 1, wherein: the pump body (1) comprises two pump shells which are mutually covered, and a plurality of slots matched with the partition plates (2) are formed in the inner wall of each pump shell along the axial direction.

3. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 1, wherein: the pump body (1) is of a vertical structure.

4. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 1, wherein: and one side of the partition plate (2) is provided with an inlet (41) communicated with the channel (4), the other side of the partition plate (2) is provided with an outlet (42) communicated with the channel (4), and the inlet (41) and the outlet (42) are arranged in a staggered manner.

5. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 4, wherein: the partition plate (2) is provided with a pair of shaft holes, and the inlet (41) is positioned at the side edge of the partition plate (2) and between the pair of shaft holes; the outlet (42) is positioned at the side edge of the back surface of the clapboard (2) and is also positioned between the pair of shaft holes; the inlet (41) and the outlet (42) are respectively positioned on two sides of the pair of shaft holes.

6. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 3, wherein: the air pump further comprises an air inlet (5) and an air outlet (6), wherein the air inlet (5) is communicated with the uppermost pump section (3), and the air outlet (6) is communicated with the lowermost pump section (3).

7. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 6, wherein: a liquid storage tank is arranged at the exhaust port (6).

8. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 1, wherein: and a pump cavity cooling channel (7) is arranged in the pump body (1).

9. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 1, wherein: a pair of rotating shafts (8) is arranged in the pump body (1), a plurality of impellers (9) are axially and uniformly distributed on each rotating shaft (8), a coupler (10) connected with the rotating shafts (8) is arranged at the top of the pump body (1), the two rotating shafts (8) are driven at the bottoms through synchronous gears (11), and a pump cover (12) used for covering the synchronous gears (11) is arranged at the bottom of the pump body (1); the upper end and the lower end of the rotating shaft (8) are both installed on the pump body (1) through bearings (14), and the upper end and the lower end of the rotating shaft (8) are both provided with seals (13).

10. The multi-section roots vacuum pump facilitating liquid drainage as claimed in claim 1, wherein: and a purging opening is formed in the air inlet (5).