CN213063943U - Booster pump/roots slide valve vacuum unit - Google Patents

Abstract

The application discloses booster pump roots sliding valve vacuum unit relates to the evacuation equipment field, and it includes the frame, be provided with the slide valve pump in the frame, be provided with the vacuum pump in the frame, be provided with the cold trap on the vacuum pump, be provided with first flapper valve on the cold trap, be provided with first pipeline on the first flapper valve, be provided with the second pipeline on the cold trap, be provided with the third pipeline on the slide valve pump, first pipeline and second pipeline all communicate the third pipeline, be provided with the second flapper valve that control first pipeline and second pipeline open and close in turn on the third pipeline, and be provided with the rotor pump that communicates the second pipeline in the frame. The application has the following advantages and effects: through setting up the dual pipeline that freely switches, realize the quick adjustment of low vacuum to high vacuum state, improve the work efficiency of vacuum unit, make the interior quick drop of vacuum furnace to high vacuum state simultaneously, improve the work efficiency of vacuum furnace, guarantee the smelting effect of titanium.

Description

Booster pump/roots slide valve vacuum unit

Technical Field

The application relates to the field of vacuum pumping equipment, in particular to a booster pump/Roots slide valve vacuum unit.

Background

In the titanium smelting process, a vacuum furnace is generally used for carrying out vacuum smelting on titanium. During the use of the vacuum furnace, the furnace chamber of the vacuum furnace needs to be vacuumized by a vacuum unit. When a vacuum unit in the related art works, a slide valve pump is generally used for vacuumizing a vacuum furnace.

However, when the vacuum degree in the vacuum furnace is high, the working efficiency of the slide valve pump will drop in a cliff-type manner along with the gradual increase of the vacuum degree, and especially when the low vacuum (0.3 Pa) is pumped to the high vacuum (0.05 Pa), a long time is needed, so that the working efficiency of the whole vacuum unit is affected, and improvement is needed.

SUMMERY OF THE UTILITY MODEL

In order to improve the working efficiency of the vacuum unit, the application aims to provide a booster pump/roots slide valve vacuum unit.

The application provides a booster pump/roots's slide valve vacuum unit adopts following technical scheme: a booster pump/Roots slide valve vacuum unit comprises a rack, wherein a slide valve pump is arranged on the rack, a vacuum pump is arranged on the rack, a cold trap is arranged on the vacuum pump, a first baffle valve is arranged on the cold trap, a first pipeline is arranged on the first baffle valve, a second pipeline is arranged on the cold trap, a third pipeline is arranged on the slide valve pump, the first pipeline and the second pipeline are both communicated with the third pipeline, a second baffle valve for controlling the first pipeline and the second pipeline to be opened and closed alternately is arranged on the third pipeline, and a rotary vane pump communicated with the second pipeline is arranged on the rack; the third pipeline comprises an air inlet pipe connected with the second baffle valve and an air outlet pipe connected with the slide valve pump, a roots pump is arranged between the air inlet pipe and the air outlet pipe, and a filter is arranged between the roots pump and the air inlet pipe.

Through adopting above-mentioned technical scheme, when using above-mentioned vacuum unit to carry out the evacuation to the vacuum furnace, connect first flapper valve in the vacuum furnace, utilize the second flapper valve to control first pipeline simultaneously and open, at this moment under the suction effect of slide valve pump, make the mist discharge to the third pipeline along first pipeline in, discharge along the slide valve pump afterwards. And when the pressure in the vacuum furnace is reduced to a low vacuum state, the second pipeline is controlled to be opened by utilizing the second baffle valve, and the vacuum furnace is vacuumized under the action of the vacuum pump, the cold trap and the rotary vane pump, so that the mixed gas is discharged into the third pipeline along the second pipeline and then discharged along the slide valve pump, and meanwhile, the pressure in the vacuum furnace is quickly reduced to a high vacuum state. Therefore, the double pipelines which are freely switched are arranged, so that the quick adjustment from low vacuum to high vacuum state is realized, the working efficiency of the vacuum unit is improved, meanwhile, the vacuum furnace is quickly lowered to the high vacuum state, the working efficiency of the vacuum furnace is improved, and the smelting effect of titanium is ensured. Through the cooperation that sets up the lobe pump, improve the suction efficiency to mist, make in the vacuum furnace fall to low vacuum and high vacuum state fast to improve vacuum unit's work efficiency. Through adopting above-mentioned technical scheme, filter the impurity in the mist through setting up the filter, avoid roots's pump and slide valve pump blocking phenomenon to appear, guarantee roots's pump and slide valve pump's normal work and high-efficient work, and then improve vacuum unit's work efficiency.

The present application may be further configured in a preferred example to: the filter comprises a support, a hollow casing is vertically arranged on the support, an air outlet is formed in the side wall of the upper end of one side of the casing, an air inlet is formed in the side wall of the middle of the other side of the casing, a filter element located between the air inlet and the air outlet is arranged in the casing, and a sewage discharge mechanism is arranged on the lower end face of the casing.

Through adopting above-mentioned technical scheme, when the filter during operation, the mist gets into in the casing along the air inlet, and the back of crossing the filtration of filter core simultaneously is discharged along the gas outlet, and the filth in the mist is accumulated in the bottom of casing simultaneously. After long-time work, the sewage draining mechanism is opened, and then the sewage can be cleaned in time. Therefore, the filter is simple in structure and stable in work, the mixed gas is stably filtered, and the interference of dirt in the mixed gas to other working parts is avoided.

The present application may be further configured in a preferred example to: the air inlet is located the inside one end of casing is buckled downwards and is provided with the stand pipe to the stand pipe back of leaving the one end of air inlet is towards the diapire of casing.

Through adopting above-mentioned technical scheme, make the mist spray the diapire position to the casing earlier through setting up the stand pipe, make the residue in the mist accumulate in the bottom of casing fast, the slow upward movement of mist again afterwards to pass through the filter core gradually, and then effectual improvement mist is at motion path and the movement time in the casing, realize the stable deposit and the high efficiency of residue and sewage and filter.

The present application may be further configured in a preferred example to: the sewage draining mechanism comprises a sewage draining outlet, a sewage draining pipe is arranged at the lower end of the sewage draining outlet in a bent mode, an cover plate is arranged at one end, deviating from the sewage draining outlet, of the sewage draining pipe, a plurality of bolts are arranged on the cover plate and connected with the sewage draining pipe in a threaded mode, and a drain valve is arranged on the outer wall of the cover plate.

Through adopting above-mentioned technical scheme, when needs clear up the filth in the filter, the unscrewing bolt is got rid of the apron, can realize the automatic outer row of filth. And after the sewage is discharged outside, the sewage outlet and the sewage discharge pipe are scrubbed, so that the sewage can be cleaned and the sewage discharge mechanism can be cleaned. Consequently, through setting up the succinct and high blowdown mechanism of stability of structure, realize quick clean of blowdown mechanism, realize simultaneously that the automation of filth is arranged outward. When the mixed gas is filtered, the water vapor in the mixed gas is gradually accumulated at the bottom of the machine shell after being condensed by the filter. Therefore, when sewage is more, the drain valve is directly opened, so that independent discharge of sewage can be realized, independent cleaning and collection of sewage and residues are realized, and the slag removal process of the filter is easier and more convenient.

The present application may be further configured in a preferred example to: the filter element comprises a hollow mesh enclosure, steel wire ball packing is arranged in the mesh enclosure, a circle of outer edge is arranged on the outer wall of the upper end of the mesh enclosure, a circle of inner edge used for abutting against the lower end face of the outer edge is arranged on the inner wall of the machine shell, and a screw in threaded connection with the inner edge is arranged on the outer edge.

Through adopting above-mentioned technical scheme, when filtering core during operation, utilize steel wire ball filler to filter the mist, utilize the big characteristic of steel wire ball filler self frictional force, realize mist's stability and scrape brush and filtration, improve the filter effect to mist. And through setting up fixed inner edge and outer fringe mutually, avoid crossing the filter core and appear rocking the phenomenon, stability when the increase is crossed the filter core and is used.

The present application may be further configured in a preferred example to: the casing includes upper end open-ended casing, the upper end outer wall of casing is provided with the round and keeps off the ring, keep off the ring and go up the cover and be provided with the closing plate, and the closing plate with keep off the interval between the ring and be provided with the steel card of a plurality of C shapes.

Through adopting above-mentioned technical scheme, through setting up the detachable closing plate to the utilization is unloaded taking of closing plate, realizes the casing and opens and the control of closed condition, thereby realizes the quick assembly disassembly and the maintenance of filter element and changes.

The present application may be further configured in a preferred example to: the upper end outer wall of casing is provided with the supporting seat, the vertical rotation is connected with the swinging boom on the supporting seat, the upper end level of swinging boom is provided with the cantilever, vertical threaded connection has the lifting hook on the cantilever, the central point of closing plate up end puts and is provided with the confession the rings that the lifting hook was hooked up.

Through adopting above-mentioned technical scheme, realize the hoist and mount of closing plate through the cooperation that sets up lifting hook and rings, simultaneously through the supplementary cooperation of swinging boom and cantilever, realize the quick control and the convenient control that the closing plate opened and closed to realize the quick clearance or the change of filter element.

The present application may be further configured in a preferred example to: the frame includes a pair of mainboard, and is a pair of all be provided with between the both ends of mainboard and connect the plate, it includes the vertical first plate body that is provided with to connect the plate, the both ends of first plate body all are provided with the second plate body, and are a pair of the second plate body is the outward form setting that expands, and is fixed in a pair of the mainboard is close to one side lateral wall each other.

Through adopting above-mentioned technical scheme, through the cooperation that sets up first plate body and the second plate body that expands outward for the connection plate has certain elasticity and resiliency, thereby increases the shock attenuation nature and the job stabilization nature of whole vacuum unit.

In summary, the present application has the following beneficial effects:

1. by arranging a freely-switched double pipeline, the quick adjustment from a low vacuum state to a high vacuum state is realized, the working efficiency of a vacuum unit is improved, meanwhile, the vacuum furnace is quickly lowered to the high vacuum state, the working efficiency of the vacuum furnace is improved, and the smelting effect of titanium is ensured;

2. the pump has the advantages that the pump efficiency of the mixed gas is improved by the matching of the roots pump, impurities in the mixed gas are filtered by the filter, the normal work and the efficient work of the roots pump and the slide valve pump are guaranteed, and the work efficiency of the vacuum unit is improved;

3. through the arrangement of the efficient sewage discharge mechanism, the independent discharge, cleaning and collection of sewage and residues are realized, so that the slag removal process of the filter is easier and more convenient;

4. by arranging the high-stability and high-efficiency filter element, stable scraping and brushing and filtering of the mixed gas are realized, and the filtering effect of the mixed gas is improved;

5. through setting up the closing plate that can dismantle and conveniently dismantle, realize the casing and open and close the stable control of state to realize the quick assembly disassembly and the maintenance change of crossing the filter core.

Drawings

FIG. 1 is a schematic structural view of an embodiment;

FIG. 2 is a schematic structural view of a filter of the embodiment;

FIG. 3 is a schematic structural view of a soil exhaust mechanism of the embodiment;

fig. 4 is a partial enlarged view at a in fig. 2;

FIG. 5 is a schematic structural diagram of a chassis of an embodiment;

fig. 6 is a schematic structural diagram of a rack of the embodiment.

Reference numerals: 1. a frame; 11. a rotary vane pump; 12. a main board; 13. connecting the plate members; 14. a first plate body; 15. a second plate body; 2. a slide valve pump; 21. a third pipeline; 22. an air inlet pipe; 23. an air outlet pipe; 24. a bellows; 25. a second baffle valve; 3. a roots pump; 4. a filter; 41. a support; 42. a housing; 43. an air outlet; 44. an air inlet; 45. a guide tube; 46. a housing; 47. a baffle ring; 48. a sealing plate; 49. steel cards; 5. a vacuum pump; 51. cold trap; 52. a first flapper valve; 53. a first pipeline; 54. a second pipeline; 6. a filter element; 61. a mesh enclosure; 62. a handle; 63. steel wire ball filler; 64. an outer edge; 65. an inner edge; 66. a screw; 7. a sewage draining mechanism; 71. a sewage draining outlet; 72. a blow-off pipe; 73. a cover plate; 74. a bolt; 75. a drain valve; 8. a supporting seat; 81. a rotating arm; 82. a cantilever; 83. a hook; 84. a hoisting ring; 9. an inflation valve.

Detailed Description

The present application is described in further detail below with reference to the attached drawings.

As shown in fig. 1, a booster pump/roots slide valve vacuum unit comprises a frame 1, and a slide valve pump 2, a roots pump 3, a filter 4 and a vacuum pump 5 are sequentially arranged on the frame 1.

As shown in fig. 1, the vacuum pump 5 is provided with a cold trap 51, the cold trap 51 is provided with a first flapper valve 52, the first flapper valve 52 is provided with a first pipe 53, and the cold trap 51 is provided with a second pipe 54.

As shown in fig. 1, the slide valve pump 2 is provided with a third pipeline 21, the third pipeline 21 includes an inlet pipe 22 and an outlet pipe 23, and the first pipeline 53 and the second pipeline 54 are both communicated with the inlet pipe 22.

As shown in fig. 1, the air inlet pipe 22 is provided with a second flapper valve 25 for controlling the alternate opening and closing of the first pipeline 53 and the second pipeline 54, and the frame 1 is provided with a rotary vane pump 11 communicated with the second pipeline 54.

As shown in fig. 1, both ends of the air inlet pipe 22 are connected to the outlet end of the second flapper valve 25 and the inlet end of the filter 4, respectively. Two ends of the air outlet pipe 23 are respectively connected with the inlet end of the slide valve pump 2 and the outlet end of the roots pump 3, and a corrugated pipe 24 is communicated between the inlet end of the roots pump 3 and the outlet end of the filter 4.

When the vacuum furnace is vacuumized using the above-described vacuum set, the first flapper valve 52 is connected to the vacuum furnace while the first pipe 53 is controlled to open by the second flapper valve 25. At this time, the mixed gas is discharged into the intake pipe 22 along the first pipe line 53 by the suction action of the spool pump 2 and the roots pump 3, and then after being filtered by the filter 4, the clean air is discharged along the roots pump 3 and the spool pump 2.

And when the vacuum furnace is reduced to a low vacuum state, the second pipeline 54 is controlled to be opened by using the second baffle valve 25, and meanwhile, the vacuum furnace is continuously vacuumized under the action of the vacuum pump 5, the cold trap 51 and the rotary vane pump 11, so that the mixed gas is discharged into the filter 4 along the second pipeline 54. After subsequent filtration by the filter 4, the clean air is discharged along the roots pump 3 and the slide valve pump 2, and the pressure in the vacuum furnace is rapidly reduced to a high vacuum state.

And under the free switching work of dual pipeline, realize the quick adjustment of low vacuum to high vacuum state, the effectual work efficiency who improves the vacuum unit. Meanwhile, when the vacuum furnace works, the temperature in the vacuum furnace can be effectively and quickly reduced to a high vacuum state, the working efficiency of the vacuum furnace is improved, and the refining and smelting effects of titanium are ensured.

As shown in fig. 1 and 2, the filter 4 includes a bracket 41, a hollow casing 42 is vertically disposed on the bracket 41, an air outlet 43 is disposed on an upper side wall of one side of the casing 42, and an air inlet 44 is disposed on a middle side wall of the other side.

As shown in fig. 2, one end of the air inlet 44 located inside the casing 42 is provided with a guide pipe 45 bent downward, and one end of the guide pipe 45 facing away from the air inlet 44 faces the bottom wall of the casing 42.

As shown in fig. 2, a filter element 6 is provided in the casing 42 between the air inlet 44 and the air outlet 43, and a pollution discharge mechanism 7 is provided on a lower end surface of the casing 42.

When the filter 4 is in operation, the mixed gas enters the casing 42 along the gas inlet 44 and the guide pipe 45, and then the mixed gas is firstly sprayed to the bottom wall position of the casing 42, so that the residue in the mixed gas is rapidly accumulated at the bottom of the casing 42, and then the mixed gas slowly moves upwards.

Until the mixed gas is filtered by the filter element 6 and discharged along the gas outlet 43, and simultaneously the dirt in the mixed gas is accumulated at the bottom of the machine shell 42. And after long-time work, the sewage discharge mechanism 7 is opened, so that the sewage can be timely cleaned.

As shown in fig. 2 and 3, the sewage discharging mechanism 7 includes a sewage discharging opening 71, a sewage discharging pipe 72 is bent at the lower end of the sewage discharging opening 71, a cover plate 73 is arranged at one end of the sewage discharging pipe 72, which is away from the sewage discharging opening 71, a plurality of bolts 74 which are in threaded connection with the sewage discharging pipe 72 are arranged on the cover plate 73, and a drain valve 75 is arranged on the outer wall of the cover plate 73.

When the mixed gas is filtered, the water vapor in the mixed gas will gradually accumulate at the bottom of the casing 42 after being condensed by the filter 4. Therefore, when the amount of the contaminated water is large, the drain valve 75 is directly opened, and then the separate discharge of the contaminated water can be realized.

When the dirt in the filter 4 needs to be thoroughly cleaned, the bolts 74 are unscrewed and the cover plate 73 is detached, so that the automatic discharge of the dirt can be realized. And after the sewage is discharged outside, the sewage outlet 71 and the sewage pipe 72 are brushed, so that the cleaning of the sewage and the cleaning of the sewage discharging mechanism 7 can be realized.

As shown in fig. 2 and 4, the filter element 6 includes a hollow mesh enclosure 61, a handle 62 is disposed at an upper end of the mesh enclosure 61, a steel wire ball filler 63 is disposed inside the mesh enclosure 61, a circle of outer edge 64 is disposed on an outer wall of the upper end of the mesh enclosure 61, a circle of inner edge 65 for abutting against a lower end face of the outer edge 64 is disposed on an inner wall of the housing 42, and a screw 66 threadedly connected to the inner edge 65 is disposed on the outer edge 64.

As shown in fig. 2 and 5, the casing 42 includes a casing 46 with an open upper end, a ring of baffle rings 47 is disposed on an outer wall of the upper end of the casing 46, a sealing plate 48 is disposed on the baffle rings 47 in a covering manner, and a plurality of C-shaped steel clips 49 are disposed between the sealing plate 48 and the baffle rings 47 at intervals.

When the filter element 6 works, the mixed gas passes through the steel wire ball filler 63 along the filter element, the mixed gas is filtered by the steel wire ball filler 63, and meanwhile, the stable scraping and filtering of the mixed gas are realized by the characteristic of large friction force of the steel wire ball filler 63, so that the filtering effect of the mixed gas is improved.

And during operation of the filter element 6 the mixed gas will impact the filter element 6 and exert an upward force on the filter element 6. At this time, the inner edge 65 and the outer edge 64 which are fixed to each other are arranged, so that the shaking phenomenon of the filter element 6 is avoided, and the stability of the filter element 6 in use is improved.

When the filter element 6 works for a long time, the filter element 6 needs to be replaced. When the filter element 6 needs to be cleaned or replaced, the C-shaped steel clamps 49 are sequentially detached, and then the sealing plate 48 is opened and detached, so that the filter element 6 machine can be detached, cleaned and replaced.

After the filter element 6 is cleaned, the filter element 6 is placed in the shell 46, and after the filter element 6 is fixed, the sealing plate 48 is placed on the baffle ring 47, and the outer wall of the sealing plate 48 is flush with the outer wall of the baffle ring 47. Finally, the sealing plate 48 and the baffle ring 47 are pressed and fixed together by utilizing the C-shaped steel clamp 49, so that the closing and the fixing of the sealing plate 48 can be realized, and the cleaning or the maintenance and the replacement of the filter element 6 can be realized at the same time.

As shown in fig. 5, a supporting seat 8 is disposed on an outer wall of an upper end of the housing 46, and a rotating arm 81 is vertically and rotatably connected to the supporting seat 8. The upper end of the rotating arm 81 is horizontally provided with a cantilever 82, the cantilever 82 is vertically screwed with a hook 83, and the central position of the upper end surface of the sealing plate 48 is provided with a hanging ring 84 for the hook 83 to hook tightly.

When the sealing plate 48 needs to be opened, the rotating hook 83 moves upward, and the hook 83 drives the sealing plate 48 to move upward synchronously. When the lower end surface of the seal plate 48 is disengaged from the stopper ring 47, the cantilever 82 is controlled to rotate synchronously by the rotating arm 81, and the opening control of the seal plate 48 is realized.

When the sealing plate 48 needs to be closed, the rotating arm 81 is used to control the cantilever 82 to rotate synchronously, and the cantilever 82 drives the sealing plate 48 to move synchronously. When the sealing plate 48 moves to the position right above the retainer ring, the lifting hook 83 is rotated to move downwards until the lower end face of the sealing plate 48 abuts against the retainer ring 47, and then the closing control of the sealing plate 48 is realized.

As shown in fig. 6, the rack 1 includes a pair of main boards 12, and is a pair of connecting plates 13 are disposed between both ends of the main boards 12, each connecting plate 13 includes a first board 14 vertically disposed, the both ends of the first board 14 are disposed with second boards 15, and are a pair of the second boards 15 are disposed in an outward-expanding shape, and are fixed on a side wall of the main board 12 close to each other.

When the whole vacuum unit works, the connection plate 13 has certain elasticity and buffering performance by the cooperation of the first plate body 14 and the second plate body 15 which is expanded outwards, so that the shock absorption performance and the working stability of the whole vacuum unit are improved.

The working principle is as follows: when the vacuum unit works, the first pipeline 53 is controlled to be opened by the second baffle valve 25. At this time, the mixed gas is discharged into the filter 4 along the first pipe line 53 by the suction action of the spool pump 2 and the roots pump 3, and then after being filtered by the filter 4, the clean air is discharged along the roots pump 3 and the spool pump 2. And when the vacuum furnace is reduced to a low vacuum state, the second pipeline 54 is controlled to be opened by using the second baffle valve 25, and meanwhile, the vacuum furnace is continuously vacuumized under the action of the vacuum pump 5, the cold trap 51 and the rotary vane pump 11, so that the mixed gas is discharged into the filter 4 along the second pipeline 54. After subsequent filtration by the filter 4, the clean air is discharged along the roots pump 3 and the slide valve pump 2, and the pressure in the vacuum furnace is rapidly reduced to a high vacuum state.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. A booster pump/roots's slide valve vacuum unit, includes frame (1), be provided with slide valve pump (2) on frame (1), its characterized in that: a vacuum pump (5) is arranged on the rack (1), a cold trap (51) is arranged on the vacuum pump (5), a first baffle valve (52) is arranged on the cold trap (51), a first pipeline (53) is arranged on the first baffle valve (52), a second pipeline (54) is arranged on the cold trap (51), a third pipeline (21) is arranged on the slide valve pump (2), the first pipeline (53) and the second pipeline (54) are both communicated with the third pipeline (21), a second baffle valve (25) for controlling the first pipeline (53) and the second pipeline (54) to be opened and closed alternately is arranged on the third pipeline (21), and a rotary vane pump (11) communicated with the second pipeline (54) is arranged on the rack (1);

the third pipeline (21) comprises an air inlet pipe (22) connected with the second baffle valve (25) and an air outlet pipe (23) connected with the slide valve pump (2), a roots pump (3) is arranged between the air inlet pipe (22) and the air outlet pipe (23), and a filter (4) is arranged between the roots pump (3) and the air inlet pipe (22).

2. A booster pump/roots slide valve vacuum unit as set forth in claim 1, wherein: the filter (4) comprises a support (41), a hollow casing (42) is vertically arranged on the support (41), an air outlet (43) is formed in the side wall of the upper end of one side of the casing (42), an air inlet (44) is formed in the side wall of the middle of the other side of the casing (42), a filter element (6) located between the air inlet (44) and the air outlet (43) is arranged in the casing (42), and a pollution discharge mechanism (7) is arranged on the lower end face of the casing (42).

3. A booster pump/roots slide valve vacuum unit as set forth in claim 2, wherein: one end of the air inlet (44) located inside the machine shell (42) is provided with a guide pipe (45) in a downward bending mode, and one end, away from the air inlet (44), of the guide pipe (45) faces the bottom wall of the machine shell (42).

4. A booster pump/roots slide valve vacuum unit as set forth in claim 2, wherein: the sewage draining mechanism (7) comprises a sewage draining outlet (71), a sewage draining pipe (72) is arranged at the lower end of the sewage draining outlet (71) in a bent mode, a cover plate (73) is arranged at one end, deviating from the sewage draining outlet (71), of the sewage draining pipe (72), a plurality of bolts (74) in threaded connection with the sewage draining pipe (72) are arranged on the cover plate (73), and a drain valve (75) is arranged on the outer wall of the cover plate (73).

5. A booster pump/Roots spool valve vacuum unit as claimed in claim 4, wherein: the filter element (6) comprises a hollow mesh enclosure (61), steel wire ball packing (63) is arranged in the mesh enclosure (61), a circle of outer edge (64) is arranged on the outer wall of the upper end of the mesh enclosure (61), a circle of inner edge (65) used for abutting against the lower end face of the outer edge (64) is arranged on the inner wall of the machine shell (42), and a screw (66) in threaded connection with the inner edge (65) is arranged on the outer edge (64).

6. A booster pump/Roots spool valve vacuum unit as claimed in claim 5, wherein: the casing (42) comprises a casing (46) with an opening at the upper end, a ring of baffle ring (47) is arranged on the outer wall of the upper end of the casing (46), a sealing plate (48) covers the baffle ring (47), and a plurality of C-shaped steel clips (49) are arranged between the sealing plate (48) and the baffle ring (47) at intervals.

7. A booster pump/roots slide valve vacuum unit as claimed in claim 6, wherein: the upper end outer wall of casing (46) is provided with supporting seat (8), vertical rotation is connected with swinging boom (81) on supporting seat (8), the upper end level of swinging boom (81) is provided with cantilever (82), vertical threaded connection has lifting hook (83) on cantilever (82), the central point of closing plate (48) up end puts and is provided with the confession lifting hook (83) rings (84) of hooking tightly.

8. A booster pump/roots slide valve vacuum unit as set forth in claim 1, wherein: frame (1) is including a pair of mainboard (12), and is a pair of all be provided with between the both ends of mainboard (12) and connect plate (13), connect plate (13) including vertical first plate body (14) that is provided with, the both ends of first plate body (14) all are provided with second plate body (15), and are a pair of second plate body (15) are the form setting that expands outward, and are fixed in a pair of mainboard (12) one side lateral wall that is close to each other.

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