CN106382223A - Double screw vacuum pump - Google Patents
Double screw vacuum pump Download PDFInfo
- Publication number
- CN106382223A CN106382223A CN201611092600.0A CN201611092600A CN106382223A CN 106382223 A CN106382223 A CN 106382223A CN 201611092600 A CN201611092600 A CN 201611092600A CN 106382223 A CN106382223 A CN 106382223A
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- China
- Prior art keywords
- axle sleeve
- pump housing
- pressure balance
- linkage section
- vacuum pump
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 230000002093 peripheral effect Effects 0.000 claims abstract description 9
- 238000007789 sealing Methods 0.000 claims description 56
- 238000013022 venting Methods 0.000 claims description 24
- 230000008878 coupling Effects 0.000 claims description 10
- 238000010168 coupling process Methods 0.000 claims description 10
- 238000005859 coupling reaction Methods 0.000 claims description 10
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000008901 benefit Effects 0.000 abstract description 2
- 230000000712 assembly Effects 0.000 abstract 2
- 238000000429 assembly Methods 0.000 abstract 2
- 239000003921 oil Substances 0.000 description 38
- 239000010687 lubricating oil Substances 0.000 description 26
- 238000012423 maintenance Methods 0.000 description 10
- 238000005299 abrasion Methods 0.000 description 5
- 230000007423 decrease Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000001050 lubricating effect Effects 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013475 authorization Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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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
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/08—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C18/12—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C18/14—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C18/16—Rotary-piston pumps specially adapted for elastic fluids of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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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
- F04C23/02—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
-
- 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
- F04C29/02—Lubrication; Lubricant separation
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
The invention provides a double screw vacuum pump, belongs to the technical field of vacuum pumps, and solves the technical problems that an existing double screw vacuum pump is not compact in structure, the power transmission precision and the transmission efficiency are reduced and the like. The double screw vacuum pump comprises a pump body and two screws which are rotatably connected to the pump body; a pressure balancing hood and a gear hood are successively fixed on the pump body; the sections, threading through the pump body, of the screws are connecting sections which thread through an inner hole of the pressure balancing hood and extent into the gear hood; oil seal assemblies which can block the inner hole of the pressure balancing hood are arranged between the connecting sections of the screws and the pressure balancing hood; one end, close to the pump body, of the inner hole of the pressure balancing hood communicates with an inner cavity of the pump body; a ventilating channel is formed in the pressure balancing hood, the external port of the ventilating channel is located on the peripheral surface of the pressure balancing hood, and the internal port of the ventilating channel communicates with the inner hole and is located on one side, close to the pump body, of the oil seal assemblies. The double screw vacuum pump provided by the invention has the advantage of improving the power transmission precision and the transmission efficiency of the screws.
Description
Technical field
The invention belongs to vacuum pump technology field, it is related to a kind of Twin-screw vacuum pump.
Background technology
Twin-screw vacuum pump is to make, using two screw rods, air-breathing and the row that synchronous high-speed reversely rotates and produces in the pump housing
The air-extractor of gas effect, it is the renewal product of oil sealing vacuum pump, can extract containing a large amount of water vapours and a small amount of powder
The gas occasion of dirt, each big pharmacy and chemical enterprise are used widely at home.
Screw rod includes linkage section, and two screw rods operationally connect to ensure synchronization by the gear being fixed on linkage section
High-speed reverse rotates, and gear needs lubricating oil to be lubricated in transmission.Dry screw vacuum pump disclosed in Chinese patent literature
【Authorization Notice No. CN2758530Y】, on two screw rods in this patent, the gear of linkage section is located in gear cavity, and linkage section leans on
It is provided with, at the nearly pump housing, the seal that can prevent oil vapour from entering in the pump housing.Due to the pump housing can be led to when screw rod runs near gear cavity
The air pressure of side is relatively low, and therefore setting seal prevents the oil vapour in gear cavity to be inhaled in the pump housing, and in order to arrange
Seal it is necessary to make linkage section length longer meeting the installation of seal, seal meeting after long-time rotation simultaneously
Abrasion, needs to change, increased maintenance cost；Meanwhile, in this patent, the rotating shaft of motor is not to be directly protruding into gear cavity and be connected
Section is directly connected to, but is attached by interlude, and this set-up mode is in order to avoid when sealing part abrasion is not changed,
The fluctuation of gear cavity internal gas pressure because gear cavity is connected, can be led to the pump housing, stirring of air pressure may be so that fluid be seeped into electricity
Lead to the damage of motor in machine, therefore must increase interlude to avoid fluid to be seeped in motor, and directly be led using which
The connecting length sent a telegraph between machine and linkage section increases, and leads to structure not compact, the reduction of power transmitting accuracy and transmission efficiency.
Content of the invention
The purpose of the present invention is that there are the problems referred to above for existing technology it is proposed that a kind of Twin-screw vacuum pump, this
The technical problem of bright solution is will not to reduce maintenance cost in the case of entering in the pump housing in guarantee lubricating oil.
The purpose of the present invention can be realized by following technical proposal：
A kind of Twin-screw vacuum pump, including the pump housing, two screw rods being rotatably connected on the pump housing, solid successively on the described pump housing
Surely there are pressure balance cover and gear cover, it is linkage section that described screw rod passes one section of the pump housing, and described linkage section passes through pressure balance
The endoporus of cover stretching into can will be pressed it is characterised in that being provided between the linkage section of described screw rod and pressure balance cover in gear cover
The Oil sealing assembly that the endoporus of dynamic balance cover blocks, the endoporus of described pressure balance cover is near one end of the pump housing with pump housing inner chamber even
Logical, described pressure balance cover has venting channels, the external port of described venting channels is located on the outer peripheral face of pressure balance cover,
The inner port of described venting channels is connected with endoporus and is located at Oil sealing assembly near the side of the pump housing.
There is in gear cover lubricating oil, lubricating oil can be blocked by Oil sealing assembly and flow through in the pressure balance cover entrance pump housing；
When Twin-screw vacuum pump runs, because in the pump housing, the air pressure at pressure balance cover is relatively low, therefore pressure balance cover
Interior gas can flow in the pump housing, extraneous air pass through venting channels be input to pressure balance cover interior so that pressure balance cover
Interior air pressure keeps normal pressure, gear cover is connected with lubricating cup so that also keeping normal pressure, pressure balance cover and gear cover in gear cover
Between there is not draught head, be therefore avoided that lubricating oil penetrates Oil sealing assembly because of draught head, thus avoid lubricating oil entering
Enter in the pump housing；Reach and avoid the lubricating oil in gear cover to enter by arranging the venting channels connecting with the pump housing and Oil sealing assembly
Purpose in the pump housing, need not arrange airtight construction so that structure is simpler between the pump housing and gear cover, there is not abrasion simultaneously
Expendable part, therefore decreases the cost of maintenance；Connection segment length due to air seal structure need not be arranged, between the pump housing and gear cover
Degree is relatively short, shortens power syndeton length, thus improve power transmitting accuracy and transmission efficiency so that whole machine runs more
Steadily reliable.
In above-mentioned Twin-screw vacuum pump, on the described pump housing, one end relative with pressure balance cover is fixed with bushing, institute
State linkage section and pass through bushing, described linkage section passes through and is cased with sealing axle sleeve, the outer peripheral face of described sealing axle sleeve on a section of bushing
On have helical spiral groove, one end of described spiral groove is connected with venting channels, described spiral groove another
End and pump housing inner space, when described sealing axle sleeve rotates with screw rod, described spiral groove can be by the gas band of venting channels
Enter in the pump housing.Gas can be drawn into the pump housing by the external world by venting channels by spiral groove active by sealing axle sleeve when rotated
Interior, it is to avoid the influence of fluctuations of pump housing internal gas pressure to interior in the hole, avoid fluid to penetrate in the pump housing by Oil sealing assembly further
May, thus ensureing that operationally lubricating oil will not enter in the pump housing Twin-screw vacuum pump, there is not mill in sealing axle sleeve simultaneously yet
Situation about damaging is safeguarded it is not necessary to change, and decreases maintenance cost.
In above-mentioned Twin-screw vacuum pump, described Oil sealing assembly includes bearing block, middle axle sleeve and axle envelope one, described axle
Bearing is fixed on the interior in the hole of pressure balance cover and bearing seat sets inside one end of gear cover, described bearing block in endoporus
There is bearing, described linkage section passes through bearing, described middle axle sleeve is sheathed to be fixed on linkage section and middle axle sleeve is located at Bearing support
One end of the nearly pump housing, described axle envelope one is arranged between bearing block and middle axle sleeve.By axle envelope one and bearing block and centre
The cooperation of axle sleeve can block lubricating oil and flow through endoporus, thus avoiding lubricating oil to enter in the pump housing；Axle envelope one can be stainless using dry type
Steel shaft is sealed, and long service life, it is not necessary to frequent replacing is safeguarded, decreases maintenance cost.
As another kind of situation, in above-mentioned Twin-screw vacuum pump, described Oil sealing assembly includes bearing block, middle axle sleeve
With some rubber seal, described bearing block be fixed on the interior in the hole of pressure balance cover and bearing seat in endoporus near gear cover
One end, be provided with bearing inside bearing block, linkage section passes through bearing, described middle axle sleeve is sheathed to be fixed on linkage section and middle
Axle sleeve is located at bearing near one end of the pump housing, and the sheathed jackshaft that is fixed on puts some described rubber seal side by side, Ruo Gansuo
The lateral surface stating rubber seal is all reclined with bearing block sealing.By some sealings realizing lubricating oil, multiple rubber seal
Service life can be improved, multiple rubber seal will be changed in full maintenance simultaneously, and maintain easily maintenance.
In above-mentioned Twin-screw vacuum pump, described linkage section is located at and between jackshaft set and bearing, is additionally provided with oil baffle
One.Oil baffle one is avoided that lubricating oil penetrates in the pump housing along the surface of linkage section, blocks lubricating oil and passes through to connect section surface
Enter the path of the pump housing, realize the purpose avoiding lubricating oil to enter in the pump housing；Oil baffle one rotates with screw rod, oil baffle one with
Against the equal geo-stationary of inner ring of, oil baffle one, middle axle sleeve and bearing, there is not the situation of abrasion, be not required in the inner ring of bearing
Maintenance to be changed, decreases maintenance cost.
In above-mentioned Twin-screw vacuum pump, one end of described sealing axle sleeve and middle axle sleeve are against described sealing axle sleeve
Have the recessed shoulder of resigning with middle axle sleeve against the inner peripheral surface of one end, be provided with, in the recessed shoulder of described resigning, the sealing being enclosed within linkage section
Circle, described middle axle sleeve and sealing axle sleeve have the butting section of projection against one end, and described butting section is stretched in the recessed shoulder of resigning simultaneously
With sealing ring against.Sealing ring is avoided that the gap between close encapsulation axle sleeve and linkage section, it is to avoid gas from sealing axle sleeve and
Enter the pump housing between linkage section or flow out the pump housing, thus being further ensured that the fluctuation of pump housing internal gas pressure does not interfere with interior in the hole
Air pressure so that the air pressure of interior in the hole remains normal pressure, avoid fluid to penetrate in the pump housing by Oil sealing assembly further
May, thus ensureing that operationally lubricating oil will not enter in the pump housing Twin-screw vacuum pump；Sealing ring, sealing axle sleeve and jackshaft
, there is not the situation of abrasion and safeguard it is not necessary to change, decrease maintenance cost in set geo-stationary.
In above-mentioned Twin-screw vacuum pump, described pressure balance cover and bearing block, middle axle sleeve, axle envelope one and bushing
Between form pressure balance chamber, described spiral groove connect with pressure balance chamber, and the inner port of described venting channels and pressure are flat
The connection of weighing apparatus chamber.Pressure balance chamber increases the space of gas circulation so that gas is more suitable when venting channels flow to spiral groove
Freely, thus ensureing that sealing axle sleeve can all the time gas be drawn in the pump housing when rotated, it is to avoid the fluctuation shadow of pump housing internal gas pressure
Ring to interior in the hole it is ensured that Twin-screw vacuum pump operationally lubricating oil will not enter in the pump housing.
In above-mentioned Twin-screw vacuum pump, Twin-screw vacuum pump also includes motor, and described motor is fixed on gear cover
And the rotating shaft of motor stretched into gear cover and be connected with the linkage section of wherein screw rod, described linkage section stretches on a section of gear cover
It is fixed with gear, the gear engagement on the linkage section of two screw rods, the rotating shaft of described motor is fixed with shaft coupling, described shaft coupling
Device is fixed with the gear on wherein screw rod linkage section by attachment bolt.The rotating shaft of motor be directly protruding in gear cover with
The linkage section of a piece screw rod connects, and further shorten power syndeton length, thus improve power between motor and screw rod passing
Pass precision and transmission efficiency so that whole machine runs more steadily reliability, make the more compact structure between motor and the pump housing, fall simultaneously
Low Twin-screw vacuum pump overall volume；Air pressure in gear cover in the presence of venting channels remains normal pressure without being subject to
The impact of pump housing internal gas pressure fluctuation, penetrates into situation in motor it is ensured that the normal fortune of motor thus without lubricating oil
OK.
In above-mentioned Twin-screw vacuum pump, described shaft coupling is fixed with disc, described gear cover and pressure balance
Oil through is had, described oil through is inclined hole, and described oil through is towards bearing on the fixing side wall of cover.Disc runs in rotating shaft
When can make in gear cover lubricating oil splash, the lubricating oil of splashing can also have lubricating oil simultaneously and enter to gear lubrication
Oil through is lubricated the normal rotation it is ensured that screw rod to bearing.
In above-mentioned Twin-screw vacuum pump, described gear cover has the perforation that the rotating shaft of power supply machine passes through, described electricity
Oil baffle two is arranged with the rotating shaft of machine, the lateral surface of described oil baffle two is reclined with the hole wall of perforation.Oil baffle two is avoided that
Enter in motor it is ensured that the normal operation of motor between the lubricating oil splashing.
In above-mentioned Twin-screw vacuum pump, the rotating shaft of described motor is also arranged with axle envelope two, described axle envelope two is located at
Between the rotating shaft of motor and the housing of motor.Axle envelope two is avoided that lubricating oil penetrates into motor internal, is further ensured that motor
Sealing.
Compared with prior art, this Twin-screw vacuum pump has guarantee lubricating oil and will not enter in the pump housing, reduces and safeguards into
This improves screw rod power transmitting accuracy and transmission efficiency so that the operation of whole machine is more steadily reliable so that vavuum pump is more compact
Advantage.
Brief description
Fig. 1 is longitudinal cross section structure diagram of this Twin-screw vacuum pump.
Fig. 2 is the mplifying structure schematic diagram in A portion in Fig. 1.
Fig. 3 is the horizontal cross section structure diagram of this Twin-screw vacuum pump.
Fig. 4 is the mplifying structure schematic diagram in B portion in Fig. 3.
In figure, 1, the pump housing；11st, bushing；2nd, pressure balance cover；21st, endoporus；22nd, venting channels；23rd, pressure balance chamber；3、
Gear cover；31st, oil through；32nd, bore a hole；33；Lubricating cup；4th, screw rod；41st, linkage section；42nd, gear；5th, sealing axle sleeve；51st, spiral
Groove；52nd, the recessed shoulder of resigning；53rd, sealing ring；6th, bearing block；61st, middle axle sleeve；611st, butting section；62nd, axle envelope one；63rd, bearing；
64th, oil baffle one；7th, motor；71st, shaft coupling；72nd, attachment bolt；73rd, oil baffle two；74th, axle envelope two；75th, disc.
Specific embodiment
The following is the specific embodiment of the present invention and combine accompanying drawing, technical scheme is further described,
But the present invention is not limited to these embodiments.
Embodiment one
As shown in figures 1 and 3, Twin-screw vacuum pump includes the pump housing 1, motor 7, two spiral shells being rotatably connected on the pump housing 1
Bar 4, the pump housing 1 is fixed with pressure balance cover 2 and gear cover 3 successively, has lubricating oil in gear cover 3, and screw rod 4 passes the pump housing 1
One section be linkage section 41, linkage section 41 passes through the endoporus 21 of pressure balance cover 2 and stretches in gear cover 3, and linkage section 41 stretches into
Gear 42 is fixed with a section of gear cover 3, the gear 42 on the linkage section 41 of two screw rods 4 engages, solid in the rotating shaft of motor 7
It is connected with shaft coupling 71, shaft coupling 71 passes through attachment bolt 72 to be fixed with the gear 42 on wherein one screw rod 4 linkage section 41, motor
7 are fixed on gear cover 3 and the rotating shaft of motor 7 is stretched into gear cover 3 and is connected with the linkage section 41 of wherein screw rod 4.
As shown in Figures 1 to 4, the endoporus 21 of pressure balance cover 2 is near one end of the pump housing 1 and the pump housing 1 inner space, screw rod
It is provided with, between 4 linkage section 41 and pressure balance cover 2, the Oil sealing assembly that endoporus 21 can be blocked, pressure balance cover 2 has logical
Gas passage 22, the external port of venting channels 22 is located on the outer peripheral face of pressure balance cover 2, the inner port of venting channels 22 and endoporus
21 connect and are located at Oil sealing assembly near the side of the pump housing 1.
As shown in Figure 2 and Figure 4, specifically, on the pump housing 1, one end relative with pressure balance cover 2 is fixed with bushing 11, even
Connect section 41 and pass through bushing 11, linkage section 41 passes through and is cased with sealing axle sleeve 5, on the outer peripheral face of sealing axle sleeve 5 on a section of bushing 11
Have helical spiral groove 51, one end of spiral groove 51 is connected with venting channels 22, the other end of spiral groove 51
With the pump housing 1 inner space, when sealing axle sleeve 5 rotates with screw rod 4, the gas of venting channels 22 can be brought into by spiral groove 51
In the pump housing 1.
As shown in Figures 1 to 4, Oil sealing assembly includes bearing block 6, middle axle sleeve 61 and axle envelope 1, and bearing block 6 is fixed on
The endoporus 21 of pressure balance cover 2 is interior and bearing block 6 is provided with bearing positioned at endoporus 21 inside one end of gear cover 3, bearing block 6
63, linkage section 41 passes through bearing 63, and middle axle sleeve 61 is sheathed to be fixed on linkage section 41 and middle axle sleeve 61 leans on positioned at bearing 63
One end of the nearly pump housing 1, axle envelope 1 is arranged between bearing block 6 and middle axle sleeve 61, linkage section 41 is located at jackshaft and covers 61
It is additionally provided with oil baffle 1 and bearing 63 between.
As shown in Figures 1 to 4, one end of sealing axle sleeve 5 and middle axle sleeve 61 are against, sealing axle sleeve 5 and middle axle sleeve 61
Inner peripheral surface against one end has the recessed shoulder 52 of resigning, is provided with, in recessed shoulder 52 of stepping down, the sealing ring 53 being enclosed within linkage section 41, middle
Axle sleeve 61 and sealing axle sleeve 5 have the butting section 611 of projection against one end, butting section 611 stretch in the recessed shoulder 52 of resigning and with close
Seal 53 is against sealing ring 53 is avoided that the gap between close encapsulation axle sleeve 5 and linkage section 41.Pressure balance cover 2 and bearing
Form pressure balance chamber 23, spiral groove 51 and pressure balance chamber between seat 6, middle axle sleeve 61, axle envelope 1 and bushing 11
23 connections, the inner port of venting channels 22 is connected with pressure balance chamber 23.
As shown in figure 1, disc 75 is fixed with shaft coupling 71, the gear cover 3 side wall fixing with pressure balance cover 2 is opened
There is oil through 31, oil through 31 is inclined hole, and oil through 31 is towards bearing 63.Have what the rotating shaft of power supply machine 7 passed through on gear cover 3
Perforation 32, the rotating shaft of motor 7 is arranged with oil baffle 2 73, and the lateral surface of oil baffle 2 73 is reclined with the hole wall of perforation 32.Electricity
Axle envelope 2 74 is also arranged with the rotating shaft of machine 7, axle envelope 2 74 is located between rotating shaft and the housing of motor 7 of motor 7.
When Twin-screw vacuum pump runs, because in the pump housing 1, the air pressure at pressure balance cover 2 is relatively low, therefore
Gas in pressure balance cover 2 can flow in the pump housing 1, and extraneous air is input in pressure balance cover 2 by venting channels 22,
Making the air pressure in pressure balance cover 2 keep normal pressure, gear cover 3 being connected with lubricating cup 33 so that often also keeping in gear cover 3
, there is not draught head between pressure balance cover 2 and gear cover 3, be therefore avoided that lubricating oil penetrates oil sealing because of draught head in pressure
Assembly, thus avoid lubricating oil enter in the pump housing 1.
Embodiment two
The present embodiment is essentially identical with the structure of embodiment one and principle, and different place is：Oil sealing assembly includes
Bearing block, middle axle sleeve and two rubber seal, bearing block is fixed on the interior in the hole of pressure balance cover and bearing seat is in interior
Hole, near one end of gear cover, is provided with bearing inside bearing block, linkage section passes through bearing, and middle axle sleeve is sheathed to be fixed on linkage section
Upper and middle axle sleeve is located at bearing near one end of the pump housing, and the sheathed jackshaft that is fixed on puts side by side for two rubber seal, and two
The lateral surface of individual rubber seal and bearing block recline sealing.
Specific embodiment described herein is only explanation for example to present invention spirit.The affiliated technology of the present invention is led
The technical staff in domain can be made various modifications or supplement or replaced using similar mode to described specific embodiment
Generation, but the spirit without departing from the present invention or surmount scope defined in appended claims.
Claims (10)
1. a kind of Twin-screw vacuum pump, including the pump housing (1), two screw rods (4) being rotatably connected on the pump housing (1), the described pump housing
(1) it is fixed with pressure balance cover (2) and gear cover (3) on successively, it is linkage section that described screw rod (4) passes one section of the pump housing (1)
(41), described linkage section (41) passes through the endoporus (21) of pressure balance cover (2) and stretches in gear cover (3) it is characterised in that institute
State and be provided between the linkage section (41) of screw rod (4) and pressure balance cover (2) and the endoporus (21) of pressure balance cover (2) can be blocked
Oil sealing assembly, the endoporus (21) of described pressure balance cover (2) is near one end of the pump housing (1) and the pump housing (1) inner space, described pressure
Venting channels (22) are had on dynamic balance cover (2), the external port of described venting channels (22) is located at the periphery of pressure balance cover (2)
On face, the inner port of described venting channels (22) is connected with endoporus (21) and is located at the side near the pump housing (1) for the Oil sealing assembly.
2. Twin-screw vacuum pump according to claim 1 is it is characterised in that the described pump housing (1) is gone up and pressure balance cover (2)
Relative one end is fixed with bushing (11), and described linkage section (41) passes through bushing (11), and described linkage section (41) passes through bushing
(11) sealing axle sleeve (5) is cased with one section, the outer peripheral face of described sealing axle sleeve (5) has helical spiral groove
(51), one end of described spiral groove (51) is connected with venting channels (22), the other end of described spiral groove (51) and the pump housing
(1) inner space, when described sealing axle sleeve (5) rotates with screw rod (4), described spiral groove (51) can be by venting channels
(22) gas is brought in the pump housing (1).
3. Twin-screw vacuum pump according to claim 2 it is characterised in that described Oil sealing assembly include bearing block (6), in
Between axle sleeve (61) and axle envelope one (62), described bearing block (6) is fixed in the endoporus (21) of pressure balance cover (2) and bearing block
(6) it is located at endoporus (21) one end near gear cover (3), inside described bearing block (6), be provided with bearing (63), described linkage section
(41) pass through bearing (63), described middle axle sleeve (61) is sheathed to be fixed on that linkage section (41) is upper and middle axle sleeve (61) is located at bearing
(63) near one end of the pump housing (1), described axle envelope one (62) is arranged between bearing block (6) and middle axle sleeve (61).
4. Twin-screw vacuum pump according to claim 3 is located at jackshaft set it is characterised in that described linkage section (41) is upper
(61) it is additionally provided with oil baffle one (64) and bearing (63) between.
5. the Twin-screw vacuum pump according to claim 3 or 4 it is characterised in that one end of described sealing axle sleeve (5) with
Between axle sleeve (61) have resigning recessed shoulder (52) with middle axle sleeve (61) against the inner peripheral surface of one end against, described sealing axle sleeve (5),
It is provided with the sealing ring (53) being enclosed within linkage section (41), described middle axle sleeve (61) and sealing axle sleeve in the recessed shoulder of described resigning (52)
(5) there is against one end the butting section (611) of projection, described butting section (611) is stretched in the recessed shoulder of resigning (52) and and sealing ring
(53) against.
6. the Twin-screw vacuum pump according to claim 3 or 4 is it is characterised in that described pressure balance cover (2) and bearing block
(6), pressure balance chamber (23), described spiral groove are formed between middle axle sleeve (61), axle envelope one (62) and bushing (11)
(51) connect with pressure balance chamber (23), the inner port of described venting channels (22) is connected with pressure balance chamber (23).
7. Twin-screw vacuum pump as claimed in any of claims 1 to 4 it is characterised in that Twin-screw vacuum pump also
Including motor (7), described motor (7) is fixed on gear cover (3) and gear cover (3) and wherein is stretched in the rotating shaft of motor (7)
The linkage section (41) of root screw rod (4) connects, and described linkage section (41) is stretched into and is fixed with gear (42) on a section of gear cover (3),
Gear (42) engagement on the linkage section (41) of two screw rods (4), the rotating shaft of described motor (7) is fixed with shaft coupling (71),
It is fixing with the gear (42) on wherein one screw rod (4) linkage section (41) that described shaft coupling (71) passes through attachment bolt (72).
8. Twin-screw vacuum pump according to claim 7 is it is characterised in that be fixed with disc on described shaft coupling (71)
(75), described gear cover (3) the side wall fixing with pressure balance cover (2) has oil through (31), described oil through (31) is
Inclined hole, described oil through (31) is towards bearing (63).
9. Twin-screw vacuum pump according to claim 7 is it is characterised in that have power supply machine (7) on described gear cover (3)
The perforation (32) that passes through of rotating shaft, the rotating shaft of described motor (7) is arranged with oil baffle two (73), described oil baffle two (73)
Lateral surface is reclined with the hole wall of perforation (32).
10. Twin-screw vacuum pump according to claim 7 is it is characterised in that be also arranged with the rotating shaft of described motor (7)
Axle envelope two (74), described axle envelope two (74) is located between rotating shaft and the housing of motor (7) of motor (7).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092600.0A CN106382223A (en) | 2016-12-01 | 2016-12-01 | Double screw vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611092600.0A CN106382223A (en) | 2016-12-01 | 2016-12-01 | Double screw vacuum pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106382223A true CN106382223A (en) | 2017-02-08 |
Family
ID=57959972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611092600.0A Pending CN106382223A (en) | 2016-12-01 | 2016-12-01 | Double screw vacuum pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106382223A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757453A (en) * | 2018-08-23 | 2018-11-06 | 中山市捷科能机电科技有限公司 | A kind of water spray double-screw compressor |
| CN110701045A (en) * | 2019-11-22 | 2020-01-17 | 海门市晶盛真空设备有限公司 | Double-screw vacuum pump |
| CN111749891A (en) * | 2020-05-27 | 2020-10-09 | 浙江珂勒曦动力设备股份有限公司 | Bearing lubricating structure of screw blower or vacuum pump |
| CN112594184A (en) * | 2020-12-16 | 2021-04-02 | 衢州市智能制造技术与装备研究院 | Main unit of aluminum alloy rotor oil-free screw compressor (Single stage) |
| CN112833007A (en) * | 2020-12-31 | 2021-05-25 | 浙江创为真空设备股份有限公司 | Screw pump comprehensive sealing structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757453A (en) * | 2018-08-23 | 2018-11-06 | 中山市捷科能机电科技有限公司 | A kind of water spray double-screw compressor |
| CN110701045A (en) * | 2019-11-22 | 2020-01-17 | 海门市晶盛真空设备有限公司 | Double-screw vacuum pump |
| CN111749891A (en) * | 2020-05-27 | 2020-10-09 | 浙江珂勒曦动力设备股份有限公司 | Bearing lubricating structure of screw blower or vacuum pump |
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| CN112594184A (en) * | 2020-12-16 | 2021-04-02 | 衢州市智能制造技术与装备研究院 | Main unit of aluminum alloy rotor oil-free screw compressor (Single stage) |
| CN112833007A (en) * | 2020-12-31 | 2021-05-25 | 浙江创为真空设备股份有限公司 | Screw pump comprehensive sealing structure |
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| CB02 | Change of applicant information |
Address after: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Applicant after: Zhejiang created as a vacuum equipment Limited by Share Ltd Address before: No. 6 Taizhou 317015 Zhejiang 317000 Toumen port Second Avenue Binhai New District Management Committee Applicant before: ZHEJIANG CHUANGWEI VACUUM EQUIPMENT CO., LTD. |
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Application publication date: 20170208 |
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| RJ01 | Rejection of invention patent application after publication |