CN202756248U - Secondary oil return preventing structure of rotary-vane vacuum pump - Google Patents
Secondary oil return preventing structure of rotary-vane vacuum pump Download PDFInfo
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- CN202756248U CN202756248U CN 201220284366 CN201220284366U CN202756248U CN 202756248 U CN202756248 U CN 202756248U CN 201220284366 CN201220284366 CN 201220284366 CN 201220284366 U CN201220284366 U CN 201220284366U CN 202756248 U CN202756248 U CN 202756248U
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Abstract
The utility model discloses a rotary-vane vacuum pump, and provides a secondary oil return preventing structure of the rotary-vane vacuum pump. The secondary oil return preventing structure is exquisite in concept, and can prevent pump oil from entering a pump cavity and a vacuum system in machine halt, and solves the technical problems that in the prior art, the pump oil enters the pump cavity after a vacuum pump is shut down so that the vacuum pump is hard to start, relative components are damaged in serious state, and the pump oil enters the vacuum system on the condition that a backflow preventing valve is out of effect, and the like. The secondary oil return preventing structure comprises a pump stator and a pump rear cover, wherein a pump rotor is eccentrically arranged in the pump cavity which is formed by the pump stator and the pump rear cover in enclosing mode. An oil storage groove is arranged on the pump rear cover, and an elastic valve block is arranged on the oil storage groove in sleeved mode. A pump oil leading-out channel and a pump oil leading-in channel are arranged in the pump rear cover, and one ends of the pump oil leading-out channel and the pump oil leading-in channel are communicated with the interior of the oil storage groove. The other ends of the pump oil leading-out channel and the pump oil leading-in channel are connected with an oil pump, and the other end of the pump oil leading-in channel is communicated with the end face of the pump rotor corresponding to the pump rear cover. Venting holes for being communicated with the air are arranged in a passageway between the end face of the pump rotor and the oil pump.
Description
Technical field
The utility model relates to a kind of rotary-vane vaccum pump, relate in particular to a kind of can be in the situation that vacuum pump is shut down, effectively avoid pumping fluid to enter that the secondary of rotary-vane vaccum pump of pump chamber and vacuum system is anti-to return oily structure.
Background technique
Vacuum pump is to utilize machinery, physics, the method such as chemistry or physical chemistry produces in a certain enclosed space, improve and keep the device of vacuum, it is widely used in medication chemistry, electronic technology, vacuum drying, the fields such as refrigeration, generally be divided into reciprocating vacuum pump, rotary vacuum pump and molecular pump etc., rotary vacuum pump wherein is the widest as the backing pump application area, but there is following problems usually in rotary vacuum pump, namely when vacuum system in vacuum or after stopping to vacuumize, because vacuum system is negative pressure, after pumping fluid enters pump chamber, oil can be inhaled into vacuum system, cause vacuum system to pollute or instrument, device damage, therefore existing vacuum pump generally all arranges the anti-fuel tap that returns at suction port, should anti-return fuel tap opens by the pressure that the oil pump that is contained on the vacuum pump produces, pump is communicated with vacuum system, thereby realize vacuumizing, after vacuum pump stops, the anti-valve that backflows relies on spring force to cut out suction port, thereby cut off the connecting passage of vacuum pump and vacuum system, avoid oil to enter vacuum system from vacuum pump, but after vacuum pump quits work, because the pump chamber the inside is vacuum state, pumping fluid namely can enter into pump chamber under the effect of negative pressure, because oil viscosity is high, exhaust resistance is large, especially under low temperature condition, can cause the vacuum pump difficulty in starting, when serious even cause blade, the damage of the component such as pump rotor causes degree of vacuum to descend until failure of vacuum pump is scrapped.In addition in the situation of the above-mentioned anti-defective valve that backflows, pumping fluid can enter vacuum system equally and cause vacuum system pollution or instrument, device damage.
Chinese patent discloses a kind of Novel rotary-vane type vacuum pump preventing oil return (CN202157963U), it comprises air inlet nozzle, filter screen, oil baffle seal ring, air inlet O-ring seals, blade spring, blade, rotor, pump body, fuel tank, No. 1 pumping fluid, exhaust valve plate, suction tude, oil baffle, be provided with oil baffle in suction tude, oil baffle is provided with the oil baffle seal ring, and the oil baffle seal ring is made of flexible rubber.This device pump when oil baffle and oil baffle seal ring being set preventing from shutting down produces returns oily phenomenon; but it can only cut off the connecting passage of vacuum pump and vacuum system equally; namely avoid oil to enter vacuum system from vacuum pump; but after vacuum pump quits work; exist equally pumping fluid namely can under the effect of negative pressure, enter into pump chamber; because oil viscosity is high; exhaust resistance is large; especially under low temperature condition; can cause the vacuum pump difficulty in starting; when serious even cause blade; the damage of the component such as pump rotor causes degree of vacuum to descend until failure of vacuum pump such as scraps at the problem.
Summary of the invention
The utility model has mainly provided a kind of rational in infrastructure; be skillfully constructed; can be in the situation of vacuum pump cancel closedown; the secondary of effectively avoiding pumping fluid to enter the rotary-vane vaccum pump of pump chamber and vacuum system prevents returning oily structure; after having solved the vacuum pump shutdown that exists in the prior art; pumping fluid can enter into pump chamber under the effect of negative pressure; exhaust resistance is large when causing vacuum pump to start; especially under low temperature condition; can cause vacuum pump can't start or difficulty in starting; when serious even cause blade; the damage of the component such as pump rotor; failure of vacuum pump is scrapped, and pumping fluid enters the technical problem of vacuum system etc. in the situation of the anti-defective valve that backflows.
Above-mentioned technical problem of the present utility model is mainly solved by following technical proposals: a kind of secondary of rotary-vane vaccum pump prevents returning oily structure, comprise pump stator and be encapsulated in the pump postoperculum of pump stator rear end, off-centre is provided with pump rotor in the pump housing receiving cavity that pump stator and pump postoperculum are enclosed, be provided with oil storage tank at described pump postoperculum, be covered with elastic valve plate at oil storage tank, in pump postoperculum, be provided with pump oil and derive passage and pump oil introduction channel, the end that pump oil is derived passage and pump oil introduction channel is communicated with in oil storage tank, the other end that pump oil is derived passage is connecting oil pump, the other end of pump oil introduction channel is communicated with on the pump rotor end face corresponding with pump postoperculum, is being provided with conducting in the exhaust port of atmosphere corresponding to the path between pump rotor end face and oil pump.Oil feeding line at vacuum pump arranges exhaust port; after pump quits work; air namely enters in the pump chamber from exhaust port under the effect of negative pressure; only have pump oil a small amount of in the oil circuit to be brought in the pump chamber this moment; thereby can not affect the again startup of vacuum pump; and in the situation of the anti-defective valve that backflows, avoided pumping fluid to enter vacuum system; realize the dual anti-oil that returns of pump chamber and vacuum system; derive the asphalt channel that passage and pump oil introduction channel form by pump oil; when pump works; oil pump fuel feeding in the oil circuit; part oil is in exhaust port is expelled to oil sump during this time; thereby make exhaust port keep sealing state; remaining pump oil enters the pump rotor end face; by deriving at pump oil between passage and the pump oil introduction channel oil storage tank is set; and at oil storage tank elastic valve plate is set; can be too high at oil pressure; and when exhaust port can't in time be got rid of pump oil outside the oil circuit; pump oil is the jack-up elastic valve plate upwards; pump oil discharges pressure release from the oil storage tank place; thereby the sustainable supply of pump chamber lubrication oil and stablizing of oil pressure have been guaranteed; when the pump oil pressure returns when normal; the elastic valve plate resilience; and automatically form sealing by the oil film between elastic valve plate and oil storage tank edge; overall structure is simple, by exhaust port pump chamber is communicated with atmosphere after shutdown, thereby when effectively having solved the difficulty in starting problem; utilize again exhaust port and oil storage tank to keep the pressure balance of pump oil; be beneficial to vacuum pump and move stably, be skillfully constructed, reasonable in design.
Exhaust port can be arranged on the elastic valve plate or pump oil introduction channel on, as preferably, described exhaust port is located near the pump oil of oil storage tank and is derived on the passage, is provided with L shaped joint at the port of exhaust port, the outlet end of L shaped joint down.When being located on the elastic valve plate, exhaust port can make on the elastic valve plate or the edge of elastic valve plate gather a large amount of pumping fluids, the pump oil pole that accumulates in herein when therefore shutting down easily is inhaled in the pump chamber, directly affect the again startup of vacuum pump when the pump chamber oil mass is too much, and when the exhaust port oil extraction, easily increase mist of oil because of the straight spray of pump oil; When exhaust port is located on the pump oil introduction channel, because pump oil elder generation through the oil storage tank pressure release, causes easily when exhaust port discharges that again charge oil pressure is not enough and cause lack of lubrication, affect the vacuum pump performance; When exhaust port is located on the pump oil derivation passage, can be by the exhaust port outside emptying pump oil of going ahead of the rest, through too high again through oil storage tank secondary emission pressure release such as the pump oil pressure behind the exhaust port, when satisfying anti-backflowing, kept the stable of pump oil oil pressure, be beneficial to the stable performance of vacuum pump performance.
As preferably, in described pump postoperculum, be provided with lubrication channel, an end of lubrication channel is being communicated with pump oil derives passage, and the other end of lubrication channel is communicated with in the rotating shaft positioning hole of the pump rotor on pump postoperculum.Form lubrication channel by deriving the passage upper branch at pump oil, can be used for the lubricated and cooling of pump rotor rotating shaft, cause the card machine phenomenon after avoiding pump rotor to cross thermal expansion.
As more preferably, the latus rectum of described lubrication channel is that pump oil is derived 1/2 to 1/3 of passage latus rectum.Reasonably the lubrication channel latus rectum also avoids the pump chamber oil mass too much to affect degree of vacuum when guaranteeing that pump oil is sent into the pump rotor rotating shaft.
As preferably, be provided with the first oil outlet and the second oil outlet at described pump oil introduction channel, the first oil outlet is connected with the pump rotor end face, and the second oil outlet is connected with the tool withdrawal groove at pump rotor end face middle part.The pump oil that the first oil outlet is discharged is used for lubricating of pump rotor end face and sealing, and the pump oil that the second oil outlet is discharged is lubricated for cooling and the rotating shaft of pump rotor.
Oil storage tank can be arranged on the side of pump postoperculum, and as preferably, described oil storage tank is located on pump postoperculum upper-end surface corresponding to pump rotor exhaust side or suction side.Oil storage tank is located at pump rotor exhaust side or suction side, being convenient to oil storage tank and pump oil derives the processing of passage and pump oil introduction channel, and when oil storage tank is positioned at the pump postoperculum upper-end surface, can make oil storage tank inner product full pumping oil, guarantee to keep oil seal between elastic valve plate and pump postoperculum.
Deriving oil storage tank can be straight-through with the importing oil storage tank, as preferably, described oil storage tank comprises the derivation oil storage tank and the importing oil storage tank that is communicated with at pump oil introduction channel port that is communicated with at pump oil derivation access port, be provided with annular oil spilling groove in the outside of deriving oil storage tank, annular oil spilling groove is connected with the importing oil storage tank.By deriving the arranged outside annular oil spilling groove of oil storage tank, make self-pumping oil derive the at first long-pending oil storage tank of completely deriving of pump oil that passage flows out, the own elasticity valve block flows into annular oil spilling groove with the upper-end surface of deriving oil storage tank again, the one, guarantee that pump oil derivation passage has enough oil pressure, the 2nd, by the oil sealing effect that contact guarantee elastic valve plate of pump oil with elastic valve plate.
As preferably, described elastic valve plate is long arc shape, and an end of elastic valve plate is fixed by screws on oil storage tank edge corresponding to pump oil introduction channel port.Long arc shape elastic valve plate sealing cover is guaranteed elastic valve plate up and down springing take an end as fulcrum on the port of the derivation of pump oil, introduction channel; When elastic valve plate is fixed on a side of pump oil introduction channel, is same as pump oil and derives the oil pressure of passage greater than the oil pressure of pump oil introduction channel, so the pump oil pressure can go up the bullet pressure release in case surpass the elastic force of elastic valve plate, be beneficial to the stable of holding pump oil pressure.
As preferably, described elastic valve plate is flat to be against on pump postoperculum surface corresponding to oil storage tank edge.Elastic valve plate is put down when being against the oil storage tank edge, guarantees oil sealing effect between the two.
Therefore, the secondary of rotary-vane vaccum pump of the present utility model prevents that returning oily structure has following advantage: after pump quits work, air namely enters in the pump chamber from exhaust port under the effect of negative pressure, thereby can not affect the again startup of vacuum pump, and in the situation of the anti-defective valve that backflows, avoided pumping fluid to enter vacuum system, realize the dual anti-oil that returns of pump chamber and vacuum system, effectively solved difficulty in starting, especially cold-starting hard problem, utilize simultaneously exhaust port and oil storage tank to keep the stable of the interior oil pressure of pump chamber, guarantee the vacuum pump smooth running, be beneficial to the stable performance of vacuum pump performance, be skillfully constructed, reasonable in design; Anti-backflowing with cooling and lubricating in one simplified product structure design, reduces production costs.
Description of drawings:
Fig. 1 is partial sectional view of the present utility model;
Fig. 2 is H-H schematic representation shown in Figure 1;
Fig. 3 is structural representation of the present utility model;
Fig. 4 is the sectional view of pump postoperculum;
Fig. 5 is the enlarged view at A shown in Figure 4 place.
Embodiment:
Below by embodiment, and by reference to the accompanying drawings, the technical solution of the utility model is described in further detail.
Embodiment 1:
As shown in Figure 1, return oily structure for the secondary of clearly describing a kind of rotary-vane vaccum pump of the present utility model is anti-, the below is illustrated as an example of the secondary rotary-vane vaccum pump example, it comprises pump stator 1 and is encapsulated in the pump postoperculum 2 of pump stator 1 rear end, a pump rotor 4 of pump housing receiving cavity 3 interior eccentric settings of enclosing at pump stator 1 and pump postoperculum 2, have the rotating shaft positioning hole 15 of pump rotor 4 at the inner side surface of pump postoperculum 2, have stator rotating shaft positioning hole at the pump stator 1 relative with rotating shaft positioning hole 15, pump rotor 4 rotary supports are between rotating shaft positioning hole 15 and stator rotating shaft positioning hole, and the both ends of the surface of pump rotor 4 are tangent with inner side surface and pump stator 1 end face of pump postoperculum 2 respectively, the cylndrical surface inner chamber of the outer ring surface of pump rotor 4 and pump stator 1 is tangent, at the rear side of the pump stator 1 prime stator of connecting, in the pump chamber of 1 of prime stator and pump stator, be provided with the fore pump rotor, the fore pump rotor is coaxial with pump rotor 4, in the outside of prime stator oil pump 8 is housed.As shown in Figures 2 and 3, have oil storage tank 7 in the upper-end surface of pump postoperculum 2, establish an elastic valve plate 9 in oil storage tank 7 upper covers, as shown in Figure 4, exhaust side at pump postoperculum 2 longitudinally has a pump oil derivation passage 5 and pump oil introduction channel 6, pump oil derivation passage 5 is identical with pump oil introduction channel 6 diameters, pump oil is derived passage 5 in the outside of pump oil introduction channel 6, the upper end that pump oil is derived passage 5 and pump oil introduction channel 6 is communicated with in oil storage tank 7, the other end that pump oil is derived passage 5 links to each other with oil pump 8 with oil circuit on the prime stator by pump stator 1, the other end of pump oil introduction channel 6 is communicated with on pump rotor 4 end faces corresponding with pump postoperculum 2, as shown in Figure 2, have the first oil outlet 13 and the second oil outlet 14 at pump oil introduction channel 6, the first oil outlet 13 is connected with pump rotor 4 end faces, the second oil outlet 14 is connected with the tool withdrawal groove at pump rotor 4 end faces middle part, as shown in Figure 5, the coaxial communication that comprises oil storage tank 7 wherein derives the derivation oil storage tank 71 and the importing oil storage tank 72 that is communicated with at pump oil introduction channel 6 ports of passage 5 ports at pump oil, and the diameter of deriving oil storage tank 71 and importing oil storage tank 72 is 1.5 times that pump oil is derived passage 5 or pump oil introduction channel 6 diameters, coaxially in the outside of deriving oil storage tank 71 have an annular oil spilling groove 73, the inboard of annular oil spilling groove 73 has a breach that is communicated with importing oil storage tank 72, elastic valve plate 9 is long arc shape and is located at annular oil spilling groove 73 and imports pump postoperculum 2 surfaces corresponding to oil storage tank 72 edges, one end of elastic valve plate 9 is fixed on the edge that imports oil storage tank 72 sides by screw 16, the edge of oil storage tank 7 guarantees smooth smooth, guarantee the elastic valve plate 9 flat oil storage tank 7 edge holding sealing states that are against, as shown in figures 1 and 3, having a conducting in the exhaust port 10 of atmosphere near the pump oil derivation passage 5 of deriving oil storage tank 71, on the port of exhaust port 10 by the screw thread L shaped joint 11 that spins, and the outlet end of L shaped joint 11 points to oil sump down, as shown in Figure 2, in pump postoperculum 2, also have a lubrication channel 12, the latus rectum of lubrication channel 12 is that pump oil is derived 1/3 of passage 5 latus rectums, one end of lubrication channel 12 is communicated with at pump oil derives on the passage 5, and the other end of lubrication channel 12 is communicated with in rotating shaft positioning hole 15.
During use, as shown in Figure 2, the pump oil that oil pump 8 provides is derived passage 5 from the pump oil that the A point enters in the pump postoperculum 2, be two-way in the punishment of B point again, wherein No. one pump oil radially flow to and is used for lubricated and cooling on the rotating shaft anchor ring of pump rotor 4, on another road direction to the C point of deriving oil storage tank 71, owing to derive passage 5 at the pump oil of ordering near C a L shaped joint 11 is housed, make wherein a part of pump oil in L shaped joint 11 is expelled to oil sump outside the pump postoperculum 2, another part pump oil enters the importing oil storage tank 72 that D is ordered from the C point, carry over again pump oil introduction channel 6 down to pump rotor 4 end faces, wherein a part of pump oil is used for seal lubrication from the end face F point that the first oil outlet 13 enters pump rotor 5, another part pump oil enters tool withdrawal groove G point on pump rotor 4 end faces from the second oil outlet 14, so far realizes the stable of the sustainable supply of lubrication oil in the pump chamber and oil pressure; As shown in Figure 1, after pump stops, air from L shaped joint 11 carry over D, F, the G point enters in the pump chamber, only have pump oil a small amount of in the oil circuit to be brought in the pump chamber this moment, thereby can not affect the again startup of vacuum pump, and in the situation of the anti-defective valve that backflows, avoided pumping fluid to enter vacuum system, realize the dual anti-oil that returns of pump chamber and vacuum system.
Embodiment 2:
Longitudinally has a pump oil in the air inlet side of pump postoperculum 2 and derive passage 5 and pump oil introduction channel 6, and the latus rectum of lubrication channel 12 is that pump oil is derived 1/2 of passage 5 latus rectums that remaining part is identical with embodiment 1.
Specific embodiment described herein only is to design of the present utility model explanation for example.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Claims (9)
1. the secondary of a rotary-vane vaccum pump prevents returning oily structure, comprise pump stator (1) and be encapsulated in the pump postoperculum (2) of pump stator (1) rear end, off-centre is provided with pump rotor (4) in the pump housing receiving cavity (3) that pump stator (1) and pump postoperculum (2) are enclosed, it is characterized in that: be provided with oil storage tank (7) at described pump postoperculum (2), be covered with elastic valve plate (9) at oil storage tank (7), in pump postoperculum (2), be provided with pump oil and derive passage (5) and pump oil introduction channel (6), the end that pump oil is derived passage (5) and pump oil introduction channel (6) is communicated with in oil storage tank (7), the other end that pump oil is derived passage (5) is connecting oil pump (8), the other end of pump oil introduction channel (6) is communicated with on pump rotor (4) end face corresponding with pump postoperculum (2), is being provided with conducting in the exhaust port (10) of atmosphere corresponding to the path between pump rotor (4) end face and oil pump (8).
2. the secondary of rotary-vane vaccum pump according to claim 1 prevents returning oily structure, it is characterized in that: described exhaust port (10) is located near the pump oil of oil storage tank (7) and is derived on the passage (5), port at exhaust port (10) is provided with L shaped joint (11), and the outlet end of L shaped joint (11) down.
3. the secondary of rotary-vane vaccum pump according to claim 1 and 2 prevents returning oily structure, it is characterized in that: in described pump postoperculum (2), be provided with lubrication channel (12), one end of lubrication channel (12) is being communicated with pump oil derives passage (5), and the other end of lubrication channel (12) is communicated with in the rotating shaft positioning hole (15) of the pump rotor (4) on pump postoperculum (2).
4. the secondary of rotary-vane vaccum pump according to claim 3 is anti-returns oily structure, it is characterized in that: the latus rectum of described lubrication channel (12) is that pump oil is derived 1/2 to 1/3 of passage (5) latus rectum.
5. the secondary of rotary-vane vaccum pump according to claim 1 and 2 prevents returning oily structure, it is characterized in that: be provided with the first oil outlet (13) and the second oil outlet (14) at described pump oil introduction channel (6), the first oil outlet (13) is connected with pump rotor (4) end face, and the second oil outlet (14) is connected with the tool withdrawal groove at pump rotor (4) end face middle part.
6. the secondary of rotary-vane vaccum pump according to claim 1 and 2 is anti-returns oily structure, it is characterized in that: described oil storage tank (7) is located on pump postoperculum (2) upper-end surface corresponding to pump rotor (4) exhaust side or suction side.
7. the secondary of rotary-vane vaccum pump according to claim 1 and 2 prevents returning oily structure, it is characterized in that: described oil storage tank (7) comprises being communicated with at pump oil derives the derivation oil storage tank (71) of passage (5) port and is communicated with importing oil storage tank (72) at oily introduction channel (6) port of pump, be provided with annular oil spilling groove (73) in the outside of deriving oil storage tank (71), annular oil spilling groove (73) is connected with importing oil storage tank (72).
8. the secondary of rotary-vane vaccum pump according to claim 1 and 2 prevents returning oily structure, it is characterized in that: described elastic valve plate (9) is long arc shape, and an end of elastic valve plate (9) is fixed on oil storage tank (7) edge corresponding to pump oil introduction channel (6) port by screw (16).
9. the secondary of rotary-vane vaccum pump according to claim 1 and 2 is anti-returns oily structure, it is characterized in that: described elastic valve plate (9) is flat to be against on pump postoperculum (2) surface corresponding to oil storage tank (7) edge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220284366 CN202756248U (en) | 2012-06-18 | 2012-06-18 | Secondary oil return preventing structure of rotary-vane vacuum pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220284366 CN202756248U (en) | 2012-06-18 | 2012-06-18 | Secondary oil return preventing structure of rotary-vane vacuum pump |
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| Publication Number | Publication Date |
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| CN202756248U true CN202756248U (en) | 2013-02-27 |
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| CN 201220284366 Expired - Lifetime CN202756248U (en) | 2012-06-18 | 2012-06-18 | Secondary oil return preventing structure of rotary-vane vacuum pump |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748296A (en) * | 2012-06-18 | 2012-10-24 | 浙江飞越机电有限公司 | Anti-oil back streaming structure of vacuum pump |
| CN103410735A (en) * | 2013-08-20 | 2013-11-27 | 浙江飞越机电有限公司 | Dual-stage rotary-vane vacuum pump with single stage function |
| CN105526174A (en) * | 2016-02-05 | 2016-04-27 | 无锡明治泵业有限公司 | Mechanism for reducing quantity of oil accumulated in pump cavity of vacuum pump |
| CN107856328A (en) * | 2017-11-28 | 2018-03-30 | 南宁市迈尔斯科技有限公司 | A kind of leg guard manufacturing process and its system |
| CN109915377A (en) * | 2019-04-16 | 2019-06-21 | 成都中科唯实仪器有限责任公司 | A kind of novel two stage rotary-vane vaccum pump |
| CN114909290A (en) * | 2022-04-18 | 2022-08-16 | 金华市威科工贸有限公司 | Oil inlet quantity adjustable vacuum pump |
-
2012
- 2012-06-18 CN CN 201220284366 patent/CN202756248U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102748296A (en) * | 2012-06-18 | 2012-10-24 | 浙江飞越机电有限公司 | Anti-oil back streaming structure of vacuum pump |
| CN102748296B (en) * | 2012-06-18 | 2015-03-25 | 浙江飞越机电有限公司 | Anti-oil back streaming structure of vacuum pump |
| CN103410735A (en) * | 2013-08-20 | 2013-11-27 | 浙江飞越机电有限公司 | Dual-stage rotary-vane vacuum pump with single stage function |
| CN105526174A (en) * | 2016-02-05 | 2016-04-27 | 无锡明治泵业有限公司 | Mechanism for reducing quantity of oil accumulated in pump cavity of vacuum pump |
| CN107856328A (en) * | 2017-11-28 | 2018-03-30 | 南宁市迈尔斯科技有限公司 | A kind of leg guard manufacturing process and its system |
| CN109915377A (en) * | 2019-04-16 | 2019-06-21 | 成都中科唯实仪器有限责任公司 | A kind of novel two stage rotary-vane vaccum pump |
| CN114909290A (en) * | 2022-04-18 | 2022-08-16 | 金华市威科工贸有限公司 | Oil inlet quantity adjustable vacuum pump |
| CN114909290B (en) * | 2022-04-18 | 2023-09-08 | 金华市威科工贸有限公司 | Vacuum pump with adjustable oil inlet quantity |
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Granted publication date: 20130227 |