CN109667759A - Twin-stage liquid-ring vacuum pump and its assembly method - Google Patents
Twin-stage liquid-ring vacuum pump and its assembly method Download PDFInfo
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- CN109667759A CN109667759A CN201811601347.6A CN201811601347A CN109667759A CN 109667759 A CN109667759 A CN 109667759A CN 201811601347 A CN201811601347 A CN 201811601347A CN 109667759 A CN109667759 A CN 109667759A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C19/00—Rotary-piston pumps with fluid ring or the like, specially adapted for elastic fluids
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
- F04C23/001—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/06—Silencing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2240/00—Components
- F04C2240/80—Other components
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The invention belongs to liquid rotary pump fields, and in particular to a kind of twin-stage liquid-ring vacuum pump and its assembly method.Twin-stage liquid-ring vacuum pump of the present invention is reasonable in design, it has two stages of compression chamber, gas passage is no longer set on midfeather, the connection of two stages of compression chamber is directly realized by external cross over pipe, therefore, in assembling process, it only needs to control gap L1, the numerical value of L4, gap L 2, L3 is by processing dimension self-assembling formation, without control, to be easy to guarantee fit-up gap, guaranteeing sucking rate, under the premise of vacuum degree is unaffected, assembly technology can be simplified, improve assembly efficiency, and promote service performance and security and stability, simultaneously compared to traditional two-stage pump, production noise can be substantially reduced, reduce noise pollution.The assembly method of the twin-stage liquid-ring vacuum pump through the invention can fully control two gap L1, L4, it is ensured that the assembly precision of the entire pump housing further simplifies assembly technology, improves assembly efficiency.
Description
Technical field
The present invention relates to a kind of twin-stage liquid-ring vacuum pump and its assembly methods, belong to liquid rotary pump field.
Background technique
With the continuous development of basic industries, vacuum equipment requires to have higher stability, especially in high vacuum
Stage has higher performance, efficiency and operational reliability.
Traditional liquid rotary pump is limited by working solution temperature, especially high vacuum stage of Fig in the actual work and loses pumping energy
Power be easy to cause air cavity to cavitate simultaneously as compression ratio is high, damages component.
Therefore in order to solve this problem, technical staff has developed Two-stage Compression vacuum pump (abbreviation two-stage pump), has two
Grade compression chamber, is equipped with impeller and suction and discharge disk (structure is as shown in Figure 7) in two stages of compression chamber, and leads between two stages of compression chamber
The gas passage crossed on midfeather 11 ' and midfeather disk 18 realizes connection, and pumping process is divided into two stages progress,
Two-stage Compression is carried out, it can be achieved that stablizing pumping speed, reduces cavitation effect.Currently, two-stage pump because have above-mentioned advantage, gradually
Replace traditional liquid rotary pump, application is relatively broad.
But traditional two-stage pump uses unshrouded impeller, in order to realize compression ratio, it is necessary to the aft gap of two impeller of strict control,
Specifically include the gap of the front and back 2 (fit-up gap i.e. between one stage impeller 7 ' and level-one suction and discharge disk 4 ' of one stage impeller 7 '
Fit-up gap L2 between L1 and one stage impeller 7 ' and midfeather disk 18) and sencond stage impeller 13 ' the gap of front and back 2 (i.e.
Between fit-up gap L3 between sencond stage impeller 13 ' and midfeather 11 ' and sencond stage impeller 13 ' and second level suction and discharge disk 16 '
Fit-up gap L4), it needs to control 4 clearance spaces so altogether, and need to meet L1=L2=L3=L4 in assembling process, in this way
Just there is very high requirement to machining accuracy and assembly precision.It is consistent that each gap size theoretically may be implemented at present, but
It is, often because of factors such as cumulative limit, assembly deflections, fit-up gap to be made to change during practical set, it is therefore desirable into
Row 2 times or more adjustment, assembler's duration, low efficiency, and in use are also suffered from using deforming, make
It is influenced with uncontrollable factors such as abrasions, it is difficult to ensure that the consistency in 4 gaps, still will appear in later period use process in this way
The gap of different sizes, gap is big to be easy to cause tolerance, vacuum degree decline, and gap is small to be easy to cause the leaves such as abrasion, stuck
Damage problem is taken turns, maintenance maintenance frequency is high, and in general, the gap of any impeller and one side becomes larger (or becoming smaller), separately with it
The gap of side can accordingly become smaller (or becoming larger), caused by adverse effect be ambilateral.Therefore, how guarantee sucking rate,
Assembly duration is reduced under the premise of vacuum degree is unaffected, improves assembly efficiency, is current urgent problem to be solved.
Summary of the invention
The technical problem to be solved by the present invention is deficiency in the prior art is overcome, when assembly can be reduced by providing one kind
Long, raising assembly efficiency is able to ascend the twin-stage liquid-ring vacuum pump of service performance and security and stability simultaneously；One is provided simultaneously
The assembly method of kind twin-stage liquid-ring vacuum pump.
Twin-stage liquid-ring vacuum pump of the present invention, including it is assemblied in the two-stage pump housing on same main shaft, the two-stage pump housing shares
One midfeather, first-stage pump body are made of level-one pump case, front pump cover, midfeather, and second-stage pump body is by second level pump case, rear pump cover, centre
Wall composition, midfeather are fixedly connected with the level-one pump case of its two sides, second level pump case, and limit shaft sleeve is mounted on main shaft, midfeather
With limit shaft sleeve clearance fit, first-stage pump body is interior to be equipped with one stage impeller and level-one suction and discharge disk, is equipped with second level in second-stage pump body
Impeller and second level suction and discharge disk, two impellers are installed on main shaft and are adjacent to limit shaft sleeve installation, two impellers and limit shaft sleeve
Rotated synchronously with main shaft, level-one suction and discharge disk is fixedly connected with level-one pump case or front pump cover, second level suction and discharge disk and
Second level pump case or rear pump cover are fixedly connected；Midfeather separates the pump chamber of the two-stage pump housing；Two impellers are all made of semi-enclosed leaf
The closed end of wheel and the two is close to midfeather, and there are gaps between the open side end and level-one suction and discharge disk of one stage impeller
L1, there are gap Ls 4 between the open side end and second level suction and discharge disk of sencond stage impeller；Level-one suction and discharge disk, one stage impeller
It surrounds around one stage of compression chamber, second level suction and discharge disk, sencond stage impeller and second level pump case is formed with level-one pump case and forms second level pressure
Contracting chamber, the volume of one stage of compression chamber are not less than the volume of two-stage compression chamber.There is pump steam inlet and intermediate row port on front pump cover,
There is front baffle, the cavity that front pump cover and level-one suction and discharge disk are surrounded by is separated into mutually independent by front baffle in front pump cover
Level-one suction chamber and level-one discharge chamber have level-one air inlet and level-one exhaust outlet, level-one air inlet on level-one suction and discharge disk
Area be greater than level-one exhaust outlet, level-one air inlet is connected to by level-one suction chamber with pump steam inlet, and level-one exhaust outlet passes through one
Grade discharge chamber is connected to intermediate row port.There is intermediate air inlet and pump exhaust inlet, intermediate air inlet passes through connection on rear pump cover
Pipe is connected to the intermediate row port on front pump cover in first-stage pump body；There are rear bulkhead, rear pump cover and second level suction and discharge in rear pump cover
The cavity that disk is surrounded by is separated into mutually independent second level suction chamber and secondary exhaust chamber, second level suction and discharge disk by rear bulkhead
Upper to have secondary inlet mouth and secondary exhaust, the area of secondary inlet mouth is greater than secondary exhaust, and secondary inlet mouth passes through two
Grade suction chamber is connected to intermediate air inlet, and secondary exhaust is communicated by secondary exhaust chamber with pump exhaust inlet.
The specific work process of twin-stage liquid-ring vacuum pump of the present invention is as follows:
Gas enters in first-stage pump body through pump steam inlet, and the level-one suction chamber through front pump cover, on level-one suction and discharge disk
Level-one air inlet enter in one stage of compression chamber, the common work of the level-one exhaust outlet on one stage impeller and level-one suction and discharge disk
Under, gas completes one stage of compression, and the level-one discharge chamber through front pump cover and intermediate row port enter cross over pipe, then through joining
Siphunculus, intermediate air inlet enter in second-stage pump body, after second level suction chamber through rear pump cover, the second level on second level suction and discharge disk
Air inlet enters in two-stage compression chamber, under the collective effect of the secondary exhaust on sencond stage impeller and second level suction and discharge disk,
Gas completes two-stage compression, and secondary exhaust chamber, pump exhaust inlet of the final compressed gas through rear pump cover are discharged.
Gas passage, i.e. two-stage is no longer arranged compared with the two-stage pump of conventionally employed unshrouded impeller in the present invention on midfeather
Compression chamber no longer passes through the gas passage on traditional midfeather and midfeather disk and realizes connection, but directly passes through external connection
Siphunculus realizes the connection of two compression chambers, and therefore, the fit-up gap L2 and sencond stage impeller between one stage impeller and midfeather are in
Fit-up gap L3 between partition is no longer the key factor for influencing the twin-stage liquid-ring vacuum pump speed of exhaust and vacuum degree, is being filled
With in the process, it is only necessary to control the numerical value of gap L1 Yu gap L 4, gap L 2, gap L 3 by processing dimension self-assembling formation,
(only it need to guarantee to all have gap between both stage impellers and midfeather, the present invention is using limit shaft sleeve by two-stage without control
Impeller separates the presence to ensure gap L 2, gap L 3), to be easy to guarantee fit-up gap, guaranteeing sucking rate, vacuum degree not
Under the premise of impacted, assembly technology can be simplified, improve assembly efficiency, because gap L 2, gap L 3 do not influence the performance of pump,
So L2, L3 dimensional values can big (general control is within 1-5mm), completely avoid in this way because gap L 2,
The reduction of gap L3 and caused by Mechanical Contact between two impellers and midfeather, not will cause and grind wound, abrasion (or even generates fire
Flower), to improve service performance and security and stability.
Except above-mentioned points, because traditional two-stage pump is during use and maintenance, can not strict control L1=L2=L3=L4, and will
Each gap control is easy to cause impeller end face to grind with suction and discharge disk within 0.1mm-0.3mm, is using
Cheng Zhonghui generates loud noise, and twin-stage liquid-ring vacuum pump of the present invention is during maintenance, it is only necessary to control between both ends
Gap (i.e. L1, L4), it is easy to operate, by using producer that can voluntarily assemble, and two gap L1, L4 control after just will not go out
The phenomenon that existing impeller end face and corresponding side suction and discharge disk grinding, therefore production noise can be substantially reduced, reduce noise pollution.
Two on level-one air inlet and level-one exhaust outlet, second level suction and discharge disk in the present invention on level-one suction and discharge disk
The shape of grade air inlet and secondary exhaust can be designed to crescent.Compared to the suction and discharge of conventionally employed other shapes
Mouthful, in breathing process, the air-breathing area of crescent air entry is gradually increased (consistent with internal pendular ring shape), and air-breathing is more flat
Surely, in exhaust process, the leaving area of crescent exhaust outlet is gradually reduced (consistent with internal pendular ring shape), is vented also more
Steadily, smooth.
Intermediate gap L1 of the present invention and the numerical value of gap L 4 may be designed as 0.1mm-0.3mm, guarantee each leaf by the numerical value
Wheel is not contacted with its front and back side discs, while being adapted with the gas molecule free path of liquid rotary pump working pressure range, is backflowed low.
Preferably, the numerical value of gap L 1 is identical as the numerical value of gap L 4, is designed to symmetrical clearance, synthesis can be made to backflow minimum.
Preferably, from front to back (i.e. from front pump cover to the direction of rear pump cover), successively have on main shaft and rise step, limit
Bulge loop, the first decline step and the second decline step；Front pump cover is assemblied in rising stepped locations by bearing；Level-one suction and discharge circle
The disk inner circumferential of disk face one stage impeller is provided with the annular groove one that depth is h1, the end of one stage impeller face level-one suction and discharge disk
Face inner circumferential is provided with the annular groove two that depth is h2, and one stage impeller is assemblied on position limiting convex ring by annular groove two from side, level-one
Suction and discharge disk is assemblied on position limiting convex ring by annular groove one from the other side, thickness h=h1+h2+L1 of position limiting convex ring；Second level
The disk inner circumferential of suction and discharge disk face sencond stage impeller is provided with annular groove three, and second level suction and discharge disk is assemblied in by annular groove three
First decline stepped locations；Rear pump cover is assemblied in the second decline stepped locations by bearing；Front pump cover and rear pump cover pass through connection
Bar is fixedly connected.By the setting of step each on main shaft and position limiting convex ring, it can guarantee gap L 1, gap in assembling process
The size of L4, so that it is guaranteed that assembly precision, the safety being further ensured that in the sucking rate, vacuum degree and use process entirely pumped
Front pump cover and rear pump cover are fixed by the connecting rod are integrated after the assembly is completed by stability, to complete the connection dress of the entire pump housing
Match.It is further preferred that the both ends of connecting rod have thread segment, bar is correspondingly connected in front pump cover, rear pump cover and is correspondingly arranged connection
Through-hole, two thread segments are each passed through front pump cover, the connection through-hole of rear pump cover and installation locking nut, are locked by connecting rod and two
Front pump cover and rear pump cover are fixedly connected by nut.
Preferably, the inner circumferential at level-one pump case and front pump cover docking is provided with the ring of positioning assembly level-one suction and discharge disk
Shape slot one, level-one suction and discharge disk are mounted in two annular grooves one, realize fixing assembling；At second level pump case and rear pump cover docking
Inner circumferential be provided with the annular groove two of positioning assembly second level suction and discharge disk, second level suction and discharge disk is mounted on two annular grooves two
In, realize fixing assembling；Midfeather and the level-one pump case and second level pump case of its two sides are assembled using seam allowance.
The present invention also provides the assembly methods of above-mentioned twin-stage liquid-ring vacuum pump, specifically include following installation step:
1. level-one suction and discharge disk, front pump cover are successively assembled on main shaft from front end, and before the front end of front pump cover passes through
Bearing is assembled with main shaft；
2. one stage impeller and level-one pump case are assembled on main shaft from rear end, and by annular groove one that level-one suction and discharge are round
Disk positioning；
3. being assembled limit shaft sleeve on main shaft from rear end, while midfeather and the assembly of level-one pump case being integrated, and makes
Midfeather and limit shaft sleeve clearance fit；
It 4. being assembled sencond stage impeller and second level pump case on main shaft from rear end, and is one by second level pump case and midfeather assembly
Body；
5. second level suction and discharge disk, rear pump cover are successively assembled on main shaft from rear end, and after the rear end of rear pump cover passes through
Bearing is assembled with main shaft；
It is integrated 6. front pump cover and rear pump cover are linked and packed by connecting rod；
7. the intermediate air inlet on rear pump cover is connected as one with the intermediate row port on front pump cover by cross over pipe.
The assembly method of the twin-stage liquid-ring vacuum pump through the invention can fully control two gap L1, L4, really
The assembly precision for having protected the entire pump housing, further simplifies assembly technology, improves assembly efficiency.
For the ease of manufacturing, twin-stage liquid-ring vacuum pump of the present invention can also be by level-one pump case, midfeather and two
For grade pump case using being integrally formed, assembly technology step carries out adaptive change with structure change, is not described further in detail in the present invention.
Compared with the prior art, the invention has the beneficial effects that:
Twin-stage liquid-ring vacuum pump of the present invention is reasonable in design, by changing the structure type of the entire pump housing, is protecting
Under the premise of card sucking rate, vacuum degree are unaffected, assembly technology can be simplified, improve assembly efficiency, and promote service performance
And security and stability, while compared to traditional two-stage pump, production noise can be substantially reduced, noise pollution is reduced；By this hair
The assembly method of the bright twin-stage liquid-ring vacuum pump can fully control two gap L1, L4, it is ensured that the dress of the entire pump housing
With precision, assembly technology is further simplified, improves assembly efficiency.
Detailed description of the invention
Fig. 1 is sectional view of the invention；
Fig. 2 is the left view of level-one suction and discharge disk in Fig. 1；
Fig. 3 is the left view of front pump cover in Fig. 1；
Fig. 4 is the right view of second level suction and discharge disk in Fig. 1；
Fig. 5 is the right view of rear pump cover in Fig. 1；
Fig. 6 is perspective view of the invention；
Fig. 7 is the structural schematic diagram of traditional two-stage pump.
In figure: 1, main shaft；2, fore bearing；3, front pump cover；4, level-one suction and discharge disk；5, locking nut；6, cross over pipe；7,
One stage impeller；8, level-one pump case；9, one stage of compression chamber；10, limit shaft sleeve；11, midfeather；12, connecting rod；13, sencond stage impeller；
14, two-stage compression chamber；15, second level pump case；16, second level suction and discharge disk；17, rear pump cover；
1.1, rise step；1.2, position limiting convex ring；1.3, the second decline step；1.4, the first decline step；
3.1, intermediate row port；3.2, pump steam inlet；3.3, front baffle；3.4, level-one suction chamber；3.5, level-one discharge chamber；
4.1, level-one air inlet；4.2, level-one exhaust outlet；
16.1, secondary inlet mouth；16.2, secondary exhaust；
17.1, pump exhaust inlet；17.2, intermediate air inlet；17.3, rear bulkhead；17.4, second level suction chamber；17.5, second level is arranged
Air cavity；
4 ', level-one suction and discharge disk；7 ', one stage impeller；11 ', midfeather；13 ', sencond stage impeller；16 ', second level suction and discharge
Disk；18, midfeather disk.
Specific embodiment
The embodiment of the present invention is described further with reference to the accompanying drawing:
As shown in figs. 1 to 6, twin-stage liquid-ring vacuum pump of the present invention includes the primary pump being assemblied on same main shaft 1
Body and second-stage pump body.Wherein:
First-stage pump body is made of level-one pump case 8, front pump cover 3, midfeather 11, and second-stage pump body is by second level pump case 15, rear pump cover
17, midfeather 11 forms, i.e., the two-stage pump housing shares a midfeather 11, level-one pump case 8, the second level pump case of midfeather 11 and its two sides
15 are fixed assembly using seam allowance, and limit shaft sleeve 10 is mounted on main shaft 1, midfeather 11 and 10 clearance fit of limit shaft sleeve.
Because without gas passage, therefore midfeather 11 separates the pump chamber of the two-stage pump housing on midfeather 11.
One stage impeller 7 and level-one suction and discharge disk 4 are equipped in first-stage pump body, one stage impeller 7 is mounted on main shaft 1 and is adjacent to
Limit shaft sleeve 10 is installed, and the inner circumferential at 3 docking of level-one pump case 8 and front pump cover is provided with positioning assembly level-one suction and discharge disk
Annular groove one, level-one suction and discharge disk 4 are assemblied in two annular grooves one, realize fixing assembling, to ensure that position is fixed, while one
4 eccentric assembling of grade suction and discharge disk has level-one air inlet 4.1 and level-one exhaust outlet on main shaft 1 on level-one suction and discharge disk 4
4.2, the area of level-one air inlet 4.1 is greater than level-one exhaust outlet 4.2, and one stage impeller 7 uses semi-enclosed impeller, and closed end is leaned on
Nearly midfeather 11, there are gap L 1, (1 numerical value of gap L is 0.1- between open side end and level-one suction and discharge disk 4
0.3mm)；Level-one suction and discharge disk 4, one stage impeller 7 and level-one pump case 8 surround and form one stage of compression chamber 9；Have on front pump cover 3
Pump steam inlet 3.2 and intermediate row port 3.1, have front baffle 3.3 in front pump cover 3, and front pump cover 3 is enclosed with level-one suction and discharge disk 4
The cavity being coiled into is separated into mutually independent level-one suction chamber 3.4 and level-one discharge chamber 3.5, level-one air inlet by front baffle 3.3
4.1 are connected to by level-one suction chamber 3.4 with pump steam inlet 3.2, and level-one exhaust outlet 4.2 passes through level-one discharge chamber 3.5 and intermediate row
Port 3.1 is connected to；
Be equipped with sencond stage impeller 13 and second level suction and discharge disk 16 in second-stage pump body, sencond stage impeller 13 be mounted on main shaft 1 and
It is adjacent to the installation of limit shaft sleeve 10, the inner circumferential at 17 docking of second level pump case 15 and rear pump cover is equally provided with positioning assembly second level suction
The annular groove two of gas disk, second level suction and discharge disk 16 are assemblied in annular groove two, it is ensured that position is fixed, while second level suction
16 eccentric assembling of gas disk has secondary inlet mouth 16.1 and secondary exhaust on main shaft 1 on second level suction and discharge disk 16
16.2, the area of secondary inlet mouth 16.1 is greater than secondary exhaust 16.2, and sencond stage impeller 13 also uses semi-enclosed impeller, envelope
Closed end is also close to midfeather 11, and there are gap Ls 4 between open side end and second level suction and discharge disk 16；Second level suction and discharge circle
Disk 16, sencond stage impeller 13 and second level pump case 15 are less than level-one pressure around two-stage compression chamber 14, the volume of two-stage compression chamber 14 is formed
The volume of contracting chamber 9；There is intermediate air inlet 17.2 and pump exhaust inlet 17.1 on rear pump cover 17, there is rear bulkhead in rear pump cover 17
17.3, the cavity that rear pump cover 17 and second level suction and discharge disk 16 are surrounded by is separated into mutually independent second level by rear bulkhead 17.3 and inhales
Air cavity 17.4 and secondary exhaust chamber 17.5, secondary inlet mouth 16.1 are connected by second level suction chamber 17.4 and intermediate air inlet 17.2
Logical, secondary exhaust 16.2 is communicated by secondary exhaust chamber 17.5 with pump exhaust inlet 17.1；
One stage impeller 7, sencond stage impeller 13 and limit shaft sleeve 10 are rotated synchronously with main shaft 1, pass through limit in the present embodiment
Position axle sleeve 10 separates both stage impellers, it is ensured that all has gap between both stage impellers and midfeather 11；
Intermediate air inlet 17.2 in second-stage pump body on rear pump cover 17 passes through on front pump cover 3 in cross over pipe 6 and first-stage pump body
Intermediate row port 3.1 be connected to；
For ease of description, 3 place end of front pump cover is defined as to the front end of main shaft 1,17 place end of rear pump cover is defined as
The rear end of main shaft 1, from front to back (i.e. from front pump cover 3 to the direction of rear pump cover 17), on main shaft 1 successively have rise step 1.1,
Position limiting convex ring 1.2, first declines step 1.4 and the second decline step 1.3；Front pump cover 3 is assemblied in by bearing rises step 1.1
Position；The disk inner circumferential of 4 face one stage impeller 7 of level-one suction and discharge disk is provided with the annular groove one that depth is h1, and one stage impeller 7 is just
The annular groove two that depth is h2 is provided with to the end face inner circumferential of level-one suction and discharge disk 4, one stage impeller 7 passes through annular groove two from side
It is assemblied on position limiting convex ring 1.2, level-one suction and discharge disk 4 is assemblied on position limiting convex ring 1.2 by annular groove one from the other side, limit
Thickness h=h1+h2+L1 of position bulge loop 1.2；The disk inner circumferential of 16 face sencond stage impeller 13 of second level suction and discharge disk is provided with annular groove
Three, second level suction and discharge disk 16 is assemblied in 1.4 position of the first decline step by annular groove three；Rear pump cover 17 is assembled by bearing
Decline 1.3 position of step second；The both ends of connecting rod 12 have thread segment, are correspondingly connected with bar 12 in front pump cover 3, rear pump cover 17
It is correspondingly arranged connection through-hole, two thread segments are each passed through front pump cover 3, the connection through-hole of rear pump cover 17 and installation locking nut 5, lead to
It crosses connecting rod 12 and front pump cover 3 and rear pump cover 17 is fixedly connected by two locking nuts 5.
In assembling process, it is ensured that the numerical value of gap L 4 is identical as the numerical value of gap L 1.
In the present embodiment, the shape of the porting on two-stage suction and discharge disk is crescent；The outer diameter of both stage impellers
It is identical, while the axial length of one stage impeller 7 is greater than the axial length of sencond stage impeller 13.
The specific work process of twin-stage liquid-ring vacuum pump described in the present embodiment is as follows:
Gas enters in first-stage pump body through pump steam inlet 3.2, and the level-one suction chamber 3.4 through front pump cover 3, level-one suction and discharge
Level-one air inlet 4.1 on disk 4 enters in one stage of compression chamber 9, the level-one on one stage impeller 7 and level-one suction and discharge disk 4
Under the collective effect of exhaust outlet 4.2, gas completes one stage of compression, and level-one discharge chamber 3.5 and intermediate exhaust through front pump cover 3
Mouthfuls 3.1 enter cross over pipes 6, then enter in second-stage pump body through cross over pipe 6, intermediate air inlet 17.2, after through rear pump cover 17
Secondary inlet mouth 16.1 in second level suction chamber 17.4, second level suction and discharge disk 16 enters in two-stage compression chamber 14, in second level leaf
Under the collective effect of wheel 13 and the secondary exhaust 16.2 on second level suction and discharge disk 16, gas completes two-stage compression, most final pressure
Secondary exhaust chamber 17.5, pump exhaust inlet 17.1 of the gas through rear pump cover 17 after contracting are discharged.
Compared with the two-stage pump of conventionally employed unshrouded impeller gas passage is no longer arranged, i.e., in the present embodiment on midfeather 11
Two stages of compression chamber no longer passes through the gas passage on traditional midfeather and midfeather disk and realizes connection, but directly passes through outside
Cross over pipe 6 realize two compression chambers connection, therefore, fit-up gap L2 and second level between one stage impeller 7 and midfeather 11
Fit-up gap L3 between impeller 13 and midfeather 11 is no longer to influence the twin-stage liquid-ring vacuum pump speed of exhaust and vacuum degree
Key factor, in assembling process, it is only necessary to control the numerical value of gap L1 Yu gap L 4, gap L 2, gap L 3 are by processing
Size self-assembling formation, to be easy to guarantee fit-up gap, is guaranteeing sucking rate, the impregnable premise of vacuum degree without control
Under, assembly technology can be simplified, improve assembly efficiency, and promote service performance and security and stability.Meanwhile it is of the present invention
Twin-stage liquid-ring vacuum pump is during maintenance, it is only necessary to it controls gap between two ends (i.e. L1, L4), it is easy to operate, and by using producer
Can voluntarily assemble, and two gap L1, L4 control after be just not in that impeller end face and corresponding side suction and discharge disk are ground
The phenomenon that mill, therefore the advantage for having noise small compared to traditional two-stage pump.
The assembly method of twin-stage liquid-ring vacuum pump, specifically comprises the following steps: described in the present embodiment
1. level-one suction and discharge disk 4, front pump cover 3 are successively assembled on main shaft 1 from front end, and the front end of front pump cover 3 is logical
Fore bearing 2 is crossed to be assembled with main shaft 1；
2. assembling one stage impeller 7 and level-one pump case 8 on main shaft 1 from rear end, and pass through annular groove one for level-one suction
Gas disk 4 positions；
3. being assembled limit shaft sleeve 10 on main shaft 1 from rear end, while midfeather 11 and level-one pump case 8 being filled by seam allowance
With being integrated, and make midfeather 11 and 10 clearance fit of limit shaft sleeve；
4. sencond stage impeller 13 and second level pump case 15 are assembled on main shaft 1 from rear end, and by second level pump case 15 and midfeather
11 are integrated by seam allowance assembly；
5. second level suction and discharge disk 16, rear pump cover 17 are successively assembled on main shaft 1 from rear end, and the rear end of rear pump cover 17
It is assembled by rear bearing and main shaft 1；
6. front pump cover 3 and rear pump cover 17 are linked and packed and are integrated by connecting rod 12；
7. the intermediate air inlet 17.2 on rear pump cover 17 is connected with the intermediate row port 3.1 on front pump cover 3 by cross over pipe 6
It is connected in one.
Two gap L1, L4 can be fully controlled by the assembly method of twin-stage liquid-ring vacuum pump described above, thus
The assembly precision for ensuring the entire pump housing, further simplifies assembly technology, improves assembly efficiency.
It is 3m with sucking rate3For the twin-stage liquid-ring vacuum pump of/min,
1) change in design post-processing precision controlling reduces (parameter), and working hour reduces by 30%, and rejection rate reduces by 60%；
2) assembling process only needs to adjust gap L 1 and gap L 4, and assembly man-hour reduces by 20%；
3) in test process, do not occur damage caused by impeller and suction and discharge disk contact, scraping, do not need 2 adjustment
Gap, the principal parameters such as the most important performance sucking rate of vacuum pump, vacuum degree, consumption power do not change, and reliability increases.
After twin-stage liquid-ring vacuum pump in the present embodiment is supplied more pharmacy, enterprise's use of refining, by concentration work
Use feedback in skill, the present embodiment use is simpler, and maintenance is simple, and accessory is easy to build；Aspect of performance, noise drop
Low, vacuum degree, tolerance, consumption power do not change.
Claims (10)
1. a kind of twin-stage liquid-ring vacuum pump, including it is assemblied in the two-stage pump housing on same main shaft (1), the two-stage pump housing shares a midfeather
(11), first-stage pump body is made of level-one pump case (8), front pump cover (3), midfeather (11), second-stage pump body by second level pump case (15), after
Pump cover (17), midfeather (11) composition, midfeather (11) are fixedly connected with the level-one pump case (8) of its two sides, second level pump case (15),
Limit shaft sleeve (10) is mounted on main shaft (1), midfeather (11) and limit shaft sleeve (10) clearance fit, is equipped with one in first-stage pump body
Grade impeller (7) and level-one suction and discharge disk (4), second-stage pump body is interior to be equipped with sencond stage impeller (13) and second level suction and discharge disk (16),
Two impellers are installed on main shaft (1) and are adjacent to limit shaft sleeve (10) installation, two impellers and limit shaft sleeve (10) with main shaft (1)
It rotates synchronously, level-one suction and discharge disk (4) is fixedly connected with level-one pump case (8) or front pump cover (3), second level suction and discharge disk
(16) it is fixedly connected with second level pump case (15) or rear pump cover (17), it is characterised in that: midfeather (11) is by the pump of the two-stage pump housing
Chamber partition；Two impellers are all made of semi-enclosed impeller and the closed end of the two is close to midfeather (11), and one stage impeller (7) opens
There are gap L 1, the open side end of sencond stage impeller (13) and second level suctions between mouth side end and level-one suction and discharge disk (4)
There are gap Ls 4 between gas disk (16)；Level-one suction and discharge disk (4), one stage impeller (7) and level-one pump case (8) surround and form one
Grade compression chamber (9), second level suction and discharge disk (16), sencond stage impeller (13) and second level pump case (15) surround and form two-stage compression chamber
(14), the volume of one stage of compression chamber (9) is not less than the volume of two-stage compression chamber (14)；
There is pump steam inlet (3.2) and intermediate row port (3.1) on front pump cover (3), there are front baffle (3.3) in front pump cover (3),
The cavity that front pump cover (3) and level-one suction and discharge disk (4) are surrounded by is separated into mutually independent level-one air-breathing by front baffle (3.3)
Chamber (3.4) and level-one discharge chamber (3.5) have level-one air inlet (4.1) and level-one exhaust outlet on level-one suction and discharge disk (4)
(4.2), the area of level-one air inlet (4.1) is greater than level-one exhaust outlet (4.2), and level-one air inlet (4.1) passes through level-one suction chamber
(3.4) it is connected to pump steam inlet (3.2), level-one exhaust outlet (4.2) passes through level-one discharge chamber (3.5) and intermediate row port (3.1)
Connection；
There is intermediate air inlet (17.2) and pump exhaust inlet (17.1), intermediate air inlet (17.2) passes through connection on rear pump cover (17)
Pipe (6) is connected to the intermediate row port (3.1) on front pump cover in first-stage pump body (3)；There is rear bulkhead in rear pump cover (17)
(17.3), the cavity that rear pump cover (17) and second level suction and discharge disk (16) are surrounded by is separated into independently of each other by rear bulkhead (17.3)
Second level suction chamber (17.4) and secondary exhaust chamber (17.5), there are secondary inlet mouth (16.1) on second level suction and discharge disk (16)
It is greater than secondary exhaust (16.2) with the area of secondary exhaust (16.2), secondary inlet mouth (16.1), secondary inlet mouth
(16.1) it is connected to by second level suction chamber (17.4) with intermediate air inlet (17.2), secondary exhaust (16.2) passes through secondary exhaust
Chamber (17.5) is communicated with pump exhaust inlet (17.1).
2. twin-stage liquid-ring vacuum pump according to claim 1, it is characterised in that: the level-one on level-one suction and discharge disk (4)
The shape of air inlet (4.1) and level-one exhaust outlet (4.2) is crescent.
3. twin-stage liquid-ring vacuum pump according to claim 1, it is characterised in that: the second level on second level suction and discharge disk (16)
The shape of air inlet (16.1) and secondary exhaust (16.2) is crescent.
4. twin-stage liquid-ring vacuum pump according to claim 1, it is characterised in that: the numerical value of gap L 1 is 0.1mm-0.3mm.
5. twin-stage liquid-ring vacuum pump according to claim 1, it is characterised in that: the numerical value of gap L 4 is 0.1mm-0.3mm.
6. any twin-stage liquid-ring vacuum pump according to claim 1~5, it is characterised in that: the numerical value of gap L 1 and
The numerical value of gap L4 is identical.
7. any twin-stage liquid-ring vacuum pump according to claim 1~5, it is characterised in that: from front to back, main shaft (1)
On successively have rise step (1.1), position limiting convex ring (1.2), first decline step (1.4) and second decline step (1.3)；Before
Pump cover (3) is assemblied in by bearing rises step (1.1) position；The disk of level-one suction and discharge disk (4) face one stage impeller (7)
Inner circumferential is provided with the annular groove one that depth is h1, and the end face inner circumferential of one stage impeller (7) face level-one suction and discharge disk (4) is provided with depth
For the annular groove two of h2, one stage impeller (7) is assemblied on position limiting convex ring (1.2) by annular groove two from side, level-one suction and discharge
Disk (4) is assemblied on position limiting convex ring (1.2) by annular groove one from the other side, thickness h=h1+h2+ of position limiting convex ring (1.2)
L1；The disk inner circumferential of second level suction and discharge disk (16) face sencond stage impeller (13) is provided with annular groove three, second level suction and discharge disk
(16) first decline step (1.4) position is assemblied in by annular groove three；Rear pump cover (17) is assemblied in the second decline by bearing
Step (1.3) position；Front pump cover (3) is fixedly connected with rear pump cover (17) by connecting rod (12).
8. twin-stage liquid-ring vacuum pump according to claim 7, it is characterised in that: the both ends of connecting rod (12) have screw thread
Section, is correspondingly connected with bar (12) in front pump cover (3), rear pump cover (17) and is correspondingly arranged connection through-hole, two thread segments are each passed through front pump
Cover (3), the connection through-hole of rear pump cover (17) and installation locking nut (5).
9. twin-stage liquid-ring vacuum pump according to claim 7, it is characterised in that: right in level-one pump case (8) and front pump cover (3)
The inner circumferential at the place of connecing is provided with the annular groove one of positioning assembly level-one suction and discharge disk, and level-one suction and discharge disk (4) is mounted on two rings
In shape slot one, fixing assembling is realized；Inner circumferential at second level pump case (15) and rear pump cover (17) docking is provided with positioning assembly second level
The annular groove two of suction and discharge disk, second level suction and discharge disk (16) are mounted in two annular grooves two, realize fixing assembling；It is intermediate
Wall (11) and the level-one pump case (8) and second level pump case (15) of its two sides are assembled using seam allowance.
10. a kind of assembly method of twin-stage liquid-ring vacuum pump as claimed in claim 9, it is characterised in that: specifically include following dress
With step:
1. level-one suction and discharge disk (4), front pump cover (3) are successively assemblied on main shaft (1) from front end, and before front pump cover (3)
It is assembled by fore bearing (2) with main shaft (1) at end；
2. one stage impeller (7) and level-one pump case (8) are assemblied on main shaft (1) from rear end, and level-one is inhaled by annular groove one
It is vented disk (4) positioning；
3. limit shaft sleeve (10) is assemblied on main shaft (1) from rear end, while being by midfeather (11) and level-one pump case (8) assembly
One, and make midfeather (11) and limit shaft sleeve (10) clearance fit；
4. sencond stage impeller (13) and second level pump case (15) are assemblied on main shaft (1) from rear end, and by second level pump case (15) in
Partition (11) assembly is integrated；
5. second level suction and discharge disk (16), rear pump cover (17) are successively assemblied on main shaft (1) from rear end, and rear pump cover (17)
It is assembled by rear bearing with main shaft (1) rear end；
6. front pump cover (3) and rear pump cover (17) are linked and packed and are integrated by connecting rod (12)；
7. passing through cross over pipe (6) for the intermediate air inlet (17.2) on rear pump cover (17) and the intermediate row port on front pump cover (3)
(3.1) it is connected as one.
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| CN201811601347.6A CN109667759B (en) | 2018-12-26 | 2018-12-26 | Double-stage liquid ring vacuum pump and assembly method thereof |
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| CN201811601347.6A CN109667759B (en) | 2018-12-26 | 2018-12-26 | Double-stage liquid ring vacuum pump and assembly method thereof |
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| CN109667759B (en) | 2023-05-05 |
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Effective date of registration: 20230413 Address after: 255200 no.296, xiwaihuan Road, Boshan District, Zibo City, Shandong Province Applicant after: Zibo Vacuum Equipment Plant Co.,Ltd. Address before: Boshan District of Shandong city in Zibo province 255200 Shuangshan Street No. 160 Applicant before: Huang Zhiting |
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