CN103306979B - Electronic vacuum pump for new energy vehicle brake vacuum booster - Google Patents

Electronic vacuum pump for new energy vehicle brake vacuum booster Download PDF

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Publication number
CN103306979B
CN103306979B CN201310267734.1A CN201310267734A CN103306979B CN 103306979 B CN103306979 B CN 103306979B CN 201310267734 A CN201310267734 A CN 201310267734A CN 103306979 B CN103306979 B CN 103306979B
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pump chamber
cover
pump
air inlet
chamber
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CN103306979A (en
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李余芝
全亚伟
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CHANGZHOU DONGNAN ELECTRICAL APPLIANCE MOTOR CO LTD
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CHANGZHOU DONGNAN ELECTRICAL APPLIANCE MOTOR CO LTD
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Abstract

The invention discloses a kind of electronic vacuum pump for new energy vehicle brake vacuum booster, comprise motor assembly, supporting base, pump chamber lower cover, driving casing, pump rotor, blade, pump chamber, pump chamber upper cover, pump casing cover and fixing pin; The left side air inlet duct of the left side air inlet duct of pump chamber lower cover, the left side air inlet through hole of pump chamber and pump chamber upper cover is connected, and forms one gas passageway; The right side air inlet duct of the right side air inlet duct of pump chamber lower cover, the right side air inlet through hole of pump chamber and pump chamber upper cover is connected, and forms one gas passageway; The guiding gutter of pump chamber lower cover communicates with the inner chamber of pump chamber, and the outgassing groove of pump chamber upper cover communicates with the inner chamber of pump chamber; The guiding gutter of pump chamber lower cover and the outgassing groove of pump chamber upper cover are symmetrical arranged.During vacuum pump work, form four gas circuits entering scene 2, substantially reduce intake resistance like this, add pump chamber air inflow, thus under equal energy consumption, vacuum pump of the present invention to vacuumize efficiency higher.

Description

Electronic vacuum pump for new energy vehicle brake vacuum booster
Technical field
The present invention relates to a kind of vacuum pump, be specifically related to a kind of electronic vacuum pump for new energy vehicle brake vacuum booster.
Background technique
The vacuum pump that domestic existing petrol and diesel oil rolling stock uses is divided into two kinds, and one is mechanical vacuum pump, and rely on motor to provide power, this kind of vacuum pump is domestic some manufacturer production at present, has been tending towards ripe gradually; Another kind is electronic vacuum pump, relies on and provides power from translator, and the current domestic automobile manufacturer of this kind of vacuum pump adopts import, particularly import German product; Though and domesticly have scientific research institutions and automobile vendor sporadicly to study, make some progress, from existing market feedback, still there is no ripe product, more do not realize the home products of volume production, mass marketing.
Along with state key advances the research and development of new energy vehicle, encourage the development of new energy vehicle, my company finds existing domestic electronic vacuum pump to be applied to after on new energy vehicle, there is series of problems, as power not, the problem such as vacuum pumping rate is too slow, working life is short, namely existing product cannot provide good performance, and some technical order cannot meet the needs of new energy vehicle development.Current Germany have developed the professional electronics vacuum pump being specifically designed to new energy vehicle, property indices maintains the leading position in the same industry, external imported product, when tapping a new source of energy vehicle, can only be selected substantially by automobile vendor of China, and domestic still do not have ripe alternative.
Chinese patent literature CN101603536B(application number 200910100508.8) disclose a kind of electric vacuum pump for automobile, comprise motor assembly, housing, stator module, rotor and gland, described housing is provided with suction port and air outlet, described stator module and motor assembly output shaft form radial disbalance, described rotor slidably connects blade, described motor assembly drive vane is rotated in stator module, described housing and gland form one and seal buffer cavity, and air enters sealing buffer cavity by suction port and discharges from air outlet; Described stator module comprises stator seat, stator and stator cover successively, described stator seat is provided with the air inlet duct communicated with shell air inlet, described stator cover is provided with and the outgassing groove sealing buffer cavity, housing air outlet communicates, described stator shaft orientation width is corresponding with blade, described air inlet duct is curved, described arc air inlet duct is corresponding with the arc of rotor and be located at and locate in rotor outer circle week, and described outgassing groove is curved, and described arc outgassing groove is corresponding with the arc of rotor and be arranged on the excircle place of rotor.
Above-mentioned vacuum pump is used on gasoline car, and the pull of vacuum that motor provides can not meet braking automobile, uses above-mentioned vacuum pump can only play assisted vacuum effect; When it being used on New-energy electric vehicle, because electric vehicle relies on vacuum pump to provide vacuum completely, above-mentioned vacuum pump does not reach the requirement of electric vehicle brake work.
In addition, Chinese patent literature CN102878080A(application number 201210427352.6) disclose a kind of electric vacuum pump, comprise motor and the pump housing, the described pump housing comprises centrally line and is sleeved on the end cap on motor output shaft successively, base plate, joint and rotor, described rotor profiles is circular, its overcoat has stator, described stator inner wall section is ellipse or closely oval, multiple blade groove is evenly had along on the circumferential surface of described rotor, one end of blade is inserted in blade groove, the other end contacts with stator inner wall, covering palte seal covers on stator surface, described outer cover suit is on end cap, the cavity formed between described stator, rotor, base plate and cover plate is separated into the pump chamber of multiple different volumes by multiple blade, described end cap is established suction port and relief opening, suction port is communicated with the gas buffer room in end cap, the air inlet fluting of described gas buffer room on base plate and cavity connects, the exhaust fluting of described cavity on cover plate is communicated with the district that is sealed formed between end cap and shell, described in be sealed district and be communicated with the relief opening on end cap.
Summary of the invention
Technical problem to be solved by this invention is to provide the brake vacuum assist device electronic vacuum pump that a kind of intake resistance is little, vacuumize the high applicable New-energy electric vehicle of efficiency.
The technological scheme realizing the object of the invention is a kind of electronic vacuum pump for new energy vehicle brake vacuum booster, comprises motor assembly, supporting base, pump chamber lower cover, driving casing, pump rotor, blade, pump chamber, pump chamber upper cover, pump casing cover and fixing pin; The output shaft of pump chamber lower cover, driving casing and pump rotor and motor assembly is coaxially set; Pump chamber lower cover is arranged on the below of pump chamber, and pump chamber upper cover is put above pump chamber, and pump chamber lower cover comprises air inlet duct, guiding gutter, mounting hole, locating notch and axis hole, and the both sides of pump chamber lower cover are respectively provided with one group of air inlet duct and guiding gutter be connected; Air inlet duct is the groove of up/down perforation, and guiding gutter is blind slot not through up and down, and the opening of guiding gutter is towards pump chamber.
Pump chamber comprises inner chamber, air inlet through hole, mounting hole and locating notch; Air inlet through hole is arranged on the both sides of pump chamber.
Pump chamber upper cover comprises air inlet duct, outgassing groove, relief opening, mounting hole and locating notch; The air inlet duct and outgassing groove of each side establishing one group to be connected of pump chamber upper cover, air inlet duct and outgassing groove are blind slot not through up and down, and the opening of air inlet duct and outgassing groove is towards pump chamber; Shape, the size of air inlet duct are identical with the air inlet duct of pump chamber lower cover; Shape, the size of outgassing groove are identical with the guiding gutter of pump chamber lower cover.
The described air inlet duct of pump chamber lower cover communicates with the air storing cavity of supporting base, and the relief opening of pump chamber upper cover communicates with the inner chamber of pump casing cover.
The air inlet duct of pump chamber lower cover is arranged on the below at the position, air inlet through hole place of pump chamber, does not communicate with the inner chamber of pump chamber; The air inlet duct of pump chamber upper cover is arranged on the top at the position, air inlet through hole place of pump chamber, does not communicate with the inner chamber of pump chamber.
The left side air inlet duct of the left side air inlet duct of pump chamber lower cover, the left side air inlet through hole of pump chamber and pump chamber upper cover is connected, and forms one gas passageway; Same, the right side air inlet duct of the right side air inlet duct of pump chamber lower cover, the right side air inlet through hole of pump chamber and pump chamber upper cover is connected, and also forms one gas passageway.
The guiding gutter of pump chamber lower cover communicates with the inner chamber of pump chamber, and the outgassing groove of pump chamber upper cover communicates with the inner chamber of pump chamber.
Described supporting base comprises seal ring, suction tude, steam outlet pipe, air storing cavity, air outlet, scaffold and installation sleeve; Suction tude is arranged on the outside of supporting base main body, and the outlet of suction tude communicates with air storing cavity; Steam outlet pipe is arranged on the outside of supporting base main body, and the suction port of steam outlet pipe is connected with the air outlet of supporting base upper surface; The air outlet of described supporting base (2) upper surface is connected with the cavity between pump casing cover and pump chamber.
Further, the axial clearance of pump rotor and pump chamber lower cover is 0.01 ~ 0.03mm, is 0.01 ~ 0.03mm with the axial clearance of pump chamber upper cover; Pump rotor and pump chamber inner chamber substantially horizontal minimum clearance are 0.01 ~ 0.03mm.
The shape of the air inlet duct of described pump chamber lower cover is arc; The guiding gutter of pump chamber lower cover comprises connecting groove section and outgassing groove section, and connecting groove section connects with air inlet duct, and the well width of connecting groove section is greater than the width of outgassing groove section; The shape of outgassing groove section is arc, outgassing groove section comparatively air inlet duct near axis hole.
The mounting hole of the mounting hole of pump chamber lower cover, the mounting hole of pump chamber and pump chamber upper cover is coaxially set, and is fixedly connected with by fixing pin; The locating notch of the locating notch of pump chamber lower cover, the locating notch of pump chamber and pump chamber upper cover is coaxially set, and is fixedly connected with by fixing pin.
The relief opening of described pump chamber upper cover has two, is symmetricly set on the both sides of pump chamber upper cover; The relief opening of every side is arranged near the termination of the air inlet duct of this side.
Described pump rotor comprises blade groove, axis hole, driving casing mounting hole and pin mouth; Driving casing mounting hole and pin mouth are positioned at the side of pump rotor towards supporting base.
Driving casing comprises two pins of cylinder-shaped body and main body periphery, the axis hole of the central authorities of cylinder-shaped body and the axis hole coaxial line of pump rotor; The cylinder-shaped body of driving casing is placed in driving casing mounting hole, and two pins of driving casing insert in the pin mouth of pump rotor respectively.
The inner plane of pump casing cover is arranged one with the circle ring column of pump casing cover coaxial line, form annular silencing groove between this circle ring column and pump casing cover.
As preferably, the inside of circle ring column also arranges annular boss, and annular boss is arranged on the inner plane of pump casing cover, and external diameter is identical with the internal diameter of circle ring column.
It is the through hole of 2mm that the air inlet through hole of the every side of described pump chamber comprises 3 ~ 6 diameters.
The present invention has positive effect: when (1) vacuum pump of the present invention works, gas is entered by supporting base suction port, is divided into left and right two-way in the air storing cavity of supporting base, enters two suction ports of pump chamber lower cover respectively; For each suction port of pump chamber lower cover, a part for the gas entered has entered into pump chamber inner chamber from the bottom up by the air flue of pump chamber lower cover, another part of gas then reaches the air flue of pump chamber upper cover by the vent at pump chamber edge, gas has finally entered into pump chamber inner chamber from top to bottom, thus gas enters pump chamber inner chamber by four gas circuits; Pump chamber is covered with two relief openings, gas eventually through the indoor chamber of two gas circuit efflux pumps, because which form the gas circuit that four enter scene 2; That is, the gas entered from a suction port of lower cover is divided into upper and lower two-way and enters pump chamber inner chamber, substantially reduces intake resistance like this, adds pump chamber air inflow, thus under equal energy consumption, vacuum pump of the present invention to vacuumize efficiency higher.
Electric-motor driven pumps working rotor, pump rotor blade is due to centrifugal action, blade throws away and againsts pump chamber inner wall rotation, the upper and lower covers of pump chamber and pump chamber is divided into the sealed air chamber varied in size by blade, air in the air chamber of sealing, is compressed gradually, is finally discharged from the air outlet hole of pump chamber upper cover, entered into the buffer cavity that pump casing cover and supporting base are formed, final gas is discharged to air from the air outlet of supporting base.
(2) pump rotor of vacuum pump of the present invention and the axial clearance of pump chamber upper and lower covers are 0.01 ~ 0.03mm, decrease the surface friction drag of pump rotor and pump chamber upper and lower covers, improve the working efficiency of electric vacuum pump; Pump rotor and pump chamber inner chamber substantially horizontal minimum clearance are 0.01 ~ 0.03mm, although the design of this gap length requires high to assembly precision, but this gap not only ensure that maximum vacuum but also can prevent pump rotor and pump chamber inner chamber stuck, vacuum pump to vacuumize efficiency higher.
(3) vacuum pump of the present invention adopts large external diameter pump rotor and eight blade designs to ensure pumping speed.
(4) the air inlet through hole of the pump chamber of vacuum pump of the present invention is arranged on the both sides of pump chamber, and there are one group 4 φ 2 air inlet through holes every side.Therefore risen by air inlet through hole uniform stream, reduce inflow noise.
In addition, the inner plane of pump casing cover also arranges silencing groove, silencing groove, form vortex from pump chamber upper cover effluent air, then flow out from the air outlet of supporting base; Due to the existence of silencing groove, reduce further noise during vacuum pump work.
Accompanying drawing explanation
Fig. 1 is the structural representation of vacuum pump of the present invention;
Fig. 2 is the explosive view of the vacuum pump of Fig. 1;
Fig. 3 is the structural representation of the supporting base of vacuum pump;
Fig. 4 is the structural representation of the pump chamber lower cover in Fig. 2;
Fig. 5 is the structural representation observed from the below of Fig. 4;
Fig. 6 is the structural representation of the pump rotor in Fig. 2;
Fig. 7 is the structural representation overturn by Fig. 6 after 180 °;
Fig. 8 is the structural representation of the pump chamber in Fig. 2;
Fig. 9 is the structural representation of the pump chamber upper cover in Fig. 2;
Figure 10 is the structural representation observed below Fig. 9;
Figure 11 is the internal structure schematic diagram of pump casing cover;
Figure 12 is the scheme of installation of supporting base, pump chamber lower cover, pump chamber, driving casing, pump rotor, blade;
Mark in above-mentioned accompanying drawing is as follows:
Motor assembly 1;
Supporting base 2, seal ring 21, suction tude 22, suction tude outlet 22-1, steam outlet pipe 23, air storing cavity 24, air outlet 25, scaffold 26, installation sleeve 27;
Pump chamber lower cover 3, air inlet duct 31, guiding gutter 32, connecting groove section 32-1, outgassing groove section 32-2, mounting hole 33, locating notch 34, axis hole 35;
Driving casing 4;
Pump rotor 5, blade groove 51, axis hole 52, driving casing mounting hole 53, pin mouth 54;
Blade 6;
Pump chamber 7, inner chamber 71, air inlet through hole 72, mounting hole 73, locating notch 74;
Pump chamber upper cover 8, air inlet duct 81, outgassing groove 82, relief opening 83, mounting hole 84, locating notch 85;
Pump casing cover 9, silencing groove 91, annular boss 92, fixing pin 100.
Embodiment
(embodiment 1)
See Fig. 1 and Fig. 2, the electronic vacuum pump for new energy vehicle brake vacuum booster of the present embodiment comprises motor assembly 1, supporting base 2, pump chamber lower cover 3, driving casing 4, pump rotor 5, blade 6, pump chamber 7, pump chamber upper cover 8, pump casing cover 9 and fixing pin 100.Pump chamber lower cover 3, driving casing 4, pump rotor 5, blade 6, pump chamber 7, pump chamber upper cover 8 and fixing pin 100 are arranged in pump casing cover 9.Pump chamber lower cover 3, driving casing 4 and pump rotor 5 is coaxially set with the output shaft of motor assembly 1.
See Fig. 3, described supporting base 2 comprises seal ring 21, suction tude 22, steam outlet pipe 23, air storing cavity 24, air outlet 25, scaffold 26 and installation sleeve 27.Supporting base 2 is fixedly linked with motor assembly 1 by scaffold 26 and installation sleeve 27, and pump casing cover 9 is fixedly connected with supporting base 2.Described scaffold 26 is arranged on the both sides of supporting base 2 main body, after installation sleeve 27 and beam combine, is fixed, plays the effect of damping noise reduction to supporting base 2 and motor assembly 1.Same, be also provided with beam between pump casing cover 9 and supporting base 2.
See Fig. 2, seal ring 21 is arranged on the below of pump chamber lower cover 3, ensures the sealing between pump chamber lower cover 3 and supporting base 2.The shape of seal ring 21 and the profile of supporting base 2 upper surface adapt, and fit with the edge of each projection of supporting base 2 upper surface.Suction tude 22 is arranged on the outside of supporting base 2 main body, and the outlet 22-1 of suction tude 22 communicates with air storing cavity 24.Steam outlet pipe 23 is arranged on the outside of supporting base 2 main body, and steam outlet pipe 23 overcoat is given vent to anger sheath; Steam outlet pipe 23 is connected with the air outlet 25 of supporting base 2 upper surface; The air outlet 25 of described supporting base 2 upper surface is connected with the cavity between pump casing cover 9 and pump chamber 7.
See Fig. 4 and Fig. 5, pump chamber lower cover 3 comprises air inlet duct 31, guiding gutter 32, mounting hole 33, locating notch 34 and axis hole 35.Axis hole 35 is arranged on the central authorities of pump chamber lower cover 3.The both sides of pump chamber lower cover 3 are respectively provided with one group of air inlet duct be connected 31 and guiding gutter 32.Air inlet duct 31 is the groove of up/down perforation, and the shape of air inlet duct 31 is arc.Guiding gutter 32 is blind slot not through up and down, and the opening of guiding gutter 32 is towards pump chamber.Guiding gutter 32 comprises connecting groove section 32-1 and outgassing groove section 32-2, and connecting groove section 32-1 connects with air inlet duct 31, and the well width of connecting groove section 32-1 is greater than the width of outgassing groove section 32-2.The shape of outgassing groove section 32-2 is arc, outgassing groove section 32-2 comparatively air inlet duct 31 near axis hole 35.Guiding gutter 32 communicates with pump chamber inner chamber 71.
Mounting hole 33 is the through hole run through up and down, is arranged on the outside of pump chamber lower cover 3 main body, and circumferentially spaced set 4 in the present embodiment, one group of air inlet duct be connected 31 and guiding gutter 32 are arranged between two mounting holes 33.Locating notch 34 is arranged on the both sides of pump chamber lower cover 3 main body.
Driving casing 4, pump rotor 5 and blade 6 are arranged in pump chamber 7.
See Fig. 2, Fig. 6 and Fig. 7, described pump rotor 5 comprises blade groove 51, axis hole 52, driving casing mounting hole 53 and pin mouth 54.The external diameter of pump rotor 5 is 38mm, and axis hole 52 is arranged on the central authorities of pump rotor 5.Blade groove 51 has 8, and blade groove 51 is square groove.Driving casing mounting hole 53 and pin mouth 54 are positioned at the side of pump rotor 5 towards supporting base 2.Driving casing 4 comprises two pins of cylinder-shaped body and main body periphery, the axis hole of the central authorities of cylinder-shaped body and the axis hole coaxial line of pump rotor 5.The cylinder-shaped body of driving casing 4 is placed in driving casing mounting hole 53, and two pins of driving casing 4 insert in the pin mouth 54 of pump rotor 5 respectively.
See Fig. 8, described pump chamber 7 comprises inner chamber 71, air inlet through hole 72, mounting hole 73 and locating notch 74.Inner chamber 71 is oval, and air inlet through hole 72 is arranged on the both sides of pump chamber 7, and there are one group 4 φ 2(diameter 2mm every side) air inlet through hole 72.Risen by air inlet through hole 72 uniform stream, reduce inflow noise.Mounting hole 73 is arranged on the corner of pump chamber 7, and the present embodiment intermediate reach arranges 4, and one group of 4 air inlet through hole 72 is arranged between two mounting holes 73.Often organize air inlet through hole 72 corresponding up and down with the position of the air inlet duct 31 of pump chamber lower cover respectively.Locating notch 74 is arranged on the both sides of pump chamber 7.
See Fig. 9 and Figure 10, described pump chamber upper cover 8 comprises air inlet duct 81, outgassing groove 82, relief opening 83, mounting hole 84 and locating notch 85.One group of air inlet duct be connected 81 and outgassing groove 82 are respectively established in the both sides of pump chamber upper cover 8, and air inlet duct 81 and outgassing groove 82 are blind slot not through up and down, and the opening of air inlet duct 81 and outgassing groove 82 is towards pump chamber 7.The shape of air inlet duct 81 is arc, and shape, the size of air inlet duct 81 are identical with the air inlet duct 31 of pump chamber lower cover 3.Shape, the size of outgassing groove 82 are identical with the guiding gutter 32 of pump chamber lower cover 3, and therefore outgassing groove 82 also comprises connecting groove section and outgassing groove section, and connecting groove section connects with air inlet duct 81, and the well width of connecting groove section is greater than the width of outgassing groove section.The shape of outgassing groove section is arc, and outgassing groove section is compared with the central authorities of air inlet duct 81 near pump chamber upper cover 8.Outgassing groove 82 communicates with pump chamber inner chamber 71.
Relief opening 83 has two, is symmetricly set on the both sides of pump chamber upper cover 8.The relief opening 83 of every side is arranged near the termination of the air inlet duct 81 of this side.Mounting hole 84 is arranged on the corner of pump chamber upper cover 8, circumferentially spaced set 4 in the present embodiment.Locating notch 85 is arranged on the both sides of pump chamber upper cover 8.
See Figure 11, the inner plane of pump casing cover 9 also arranges silencing groove 91, described silencing groove 91 is the circular groove of opening towards pump chamber 7.On the inner plane of pump casing cover 9 (in Fig. 2 for top planes) arrange one with the circle ring column of pump casing cover 9 coaxial line, form silencing groove 91 between this circle ring column and pump casing cover 9.In order to strengthen the intensity of silencing groove 91, the inside of circle ring column also arranges annular boss 92, and this annular boss 92 is arranged on the inner plane of pump casing cover 9, and its external diameter is identical with the internal diameter of circle ring column.Thus silencing groove 91, form vortex from relief opening 83 effluent air of pump chamber upper cover 8, then flow out from the air outlet of supporting base; Due to the existence of silencing groove, reduce further noise during vacuum pump work.
See Figure 12, the output shaft of motor assembly 1 is successively through the axis hole 35 of pump chamber lower cover 3 and the axis hole 52 of pump rotor 5.The mounting hole 84 of the mounting hole 33 of pump chamber lower cover 3, the mounting hole 73 of pump chamber 7 and pump chamber upper cover 8 is coaxially set respectively, is fixedly connected with by fixing pin 100.The locating notch 85 of the locating notch 34 of pump chamber lower cover 3, the locating notch 74 of pump chamber 7 and pump chamber upper cover 8 is coaxially set respectively, is located and be fixedly connected with by fixing pin 100.
Pump chamber lower cover 3 is arranged on the below of pump chamber 7, and pump chamber upper cover 8 is arranged on the top of pump chamber 7.The air inlet duct 31 of pump chamber lower cover 3 communicates with the air storing cavity 24 of supporting base 2.The relief opening 83 of pump chamber upper cover 8 communicates with the inner chamber of pump casing cover 9.
See Fig. 2, the air inlet duct 31 of pump chamber lower cover 3 is arranged on the below at the position, air inlet through hole 72 place of pump chamber 7, does not directly communicate with the inner chamber of pump chamber 7.The air inlet duct 81 of pump chamber upper cover 8 is arranged on the top at the position, air inlet through hole 72 place of pump chamber 7, does not directly communicate with the inner chamber of pump chamber 7.
The side air inlet duct 31 of pump chamber lower cover 3 is arranged on below the side air inlet through hole 72 of pump chamber 7, and the side air inlet duct 81 of pump chamber upper cover 8 is arranged on above the side air inlet through hole 72 of pump chamber 7; The opposite side air inlet duct 31 of pump chamber lower cover 3 is arranged on below the opposite side air inlet through hole 72 of pump chamber 7, and the opposite side air inlet duct 81 of pump chamber upper cover 8 is arranged on above the opposite side air inlet through hole 72 of pump chamber 7.In the present embodiment, the left side air inlet duct 81 of the left side air inlet duct 31 of pump chamber lower cover 3, the left side air inlet through hole 72 of pump chamber 7 and pump chamber upper cover 8 is connected, and forms one gas passageway; Same, the right side air inlet duct 81 of the right side air inlet duct 31 of pump chamber lower cover 3, the right side air inlet through hole 72 of pump chamber 7 and pump chamber upper cover 8 is connected, and also forms one gas passageway.
The guiding gutter 32 of pump chamber lower cover 3 communicates with the inner chamber of pump chamber 7, and the outgassing groove 82 of pump chamber upper cover 8 communicates with the inner chamber of pump chamber 7.The guiding gutter 32 of pump chamber lower cover 3 and the outgassing groove 82 of pump chamber upper cover 8 for symmetry plane is symmetrical arranged, enter the same area of pump chamber 7 with the center cross-sectional of pump chamber 7 from guiding gutter 32 and outgassing groove 82 effluent air of pump chamber upper cover 8 of pump chamber lower cover 3.
Pump rotor 5 is respectively 0.01 ~ 0.03mm with the axial clearance of pump chamber upper and lower covers, decreases pump rotor 5 and the surface friction drag of pump chamber upper and lower covers, improves the working efficiency of electric vacuum pump; Pump rotor 5 and pump chamber 7 inner chamber substantially horizontal minimum clearance are 0.01 ~ 0.03mm, and also namely pump rotor 5 is 0.01 ~ 0.03mm with the gap at the minimum diameter place of pump chamber 7, not only ensure that maximum vacuum but also can prevent pump rotor and pump chamber inner chamber stuck.
During vacuum pump work of the present invention, gas is entered by the suction tude 22 of supporting base 2, after the air storing cavity 24 of supporting base 2 cushions, is divided into left and right two-way, enters two air inlet ducts 31 of pump chamber lower cover 3 respectively.The a part of gas now entering air inlet duct 31 enters the air inlet through hole 72 of pump chamber 7 from bottom to top, arrives the air inlet duct 81 of pump chamber upper cover 8, then enters the inner chamber of pump chamber 7 from the outgassing groove 82 communicated with air inlet duct 81 from the top down; Another part gas entering air inlet duct 31 enters the inner chamber of pump chamber 7 by the guiding gutter 32 communicated with air inlet duct 31.Therefore, the gas entered from air inlet duct 31 is divided into upper and lower two-way and enters pump chamber inner chamber, substantially reduces intake resistance like this, adds pump chamber air inflow, thus under equal energy consumption, vacuum pump of the present invention to vacuumize efficiency higher.
Electric-motor driven pumps rotor 5 works, pump rotor blade 6 is due to centrifugal action, blade 6 throws away and againsts the rotation of pump chamber 7 inwall, the upper and lower covers of pump chamber and pump chamber is divided into the sealed air chamber varied in size by blade, air in the air chamber of sealing is compressed gradually, finally discharge from two exhaust ports 83 of pump chamber upper cover, enter into the buffer cavity that pump casing cover 9 is formed, final gas is discharged to air from the steam outlet pipe 23 of supporting base, now complete in two interlobate cavitys of compression and exhaust process and form vacuum, when these two blades turn to the upper of pump chamber 7 again, during lower gas inlet, produce pull of vacuum, the problem of vacuum degree deficiency needed for vacuum booster during solution automobile brake.Vacuum pump of the present invention defines the gas circuit that four enter scene 2, and such gas piping design, considerably increases pump chamber air inflow, further increase pumping speed.

Claims (10)

1. an electronic vacuum pump for new energy vehicle brake vacuum booster, comprises motor assembly (1), supporting base (2), pump chamber lower cover (3), driving casing (4), pump rotor (5), blade (6), pump chamber (7), pump chamber upper cover (8), pump casing cover (9) and fixing pin (100); Pump chamber lower cover (3), driving casing (4) and pump rotor (5) are coaxially set with the output shaft of motor assembly (1); Pump chamber lower cover (3) is arranged on the below of pump chamber (7), and pump chamber upper cover (8) is arranged on the top of pump chamber (7), it is characterized in that:
Pump chamber lower cover (3) comprises air inlet duct (31), guiding gutter (32), mounting hole (33), locating notch (34) and axis hole (35), and the both sides of pump chamber lower cover (3) are respectively provided with one group of air inlet duct be connected (31) and guiding gutter (32); The groove that air inlet duct (31) is up/down perforation, guiding gutter (32) is blind slot not through up and down, and the opening of guiding gutter (32) is towards pump chamber (7);
Pump chamber (7) comprises inner chamber (71), air inlet through hole (72), mounting hole (73) and locating notch (74); Air inlet through hole (72) is arranged on the both sides of pump chamber (7);
Pump chamber upper cover (8) comprises air inlet duct (81), outgassing groove (82), relief opening (83), mounting hole (84) and locating notch (85); Pump chamber upper cover (8) each side establish one group of air inlet duct be connected (81) and outgassing groove (82), air inlet duct (81) and outgassing groove (82) are blind slot not through up and down, and the opening of air inlet duct (81) and outgassing groove (82) is towards pump chamber (7); Shape, the size of air inlet duct (81) are identical with the air inlet duct (31) of pump chamber lower cover (3); Shape, the size of outgassing groove (82) are identical with the guiding gutter (32) of pump chamber lower cover (3);
The air inlet duct (31) of described pump chamber lower cover (3) communicates with the air storing cavity (24) of supporting base (2), and the relief opening (83) of pump chamber upper cover (8) communicates with the inner chamber of pump casing cover (9);
The air inlet duct (31) of pump chamber lower cover (3) is arranged on the below at air inlet through hole (72) position, place of pump chamber (7), does not communicate with the inner chamber of pump chamber (7); The air inlet duct (81) of pump chamber upper cover (8) is arranged on the top at air inlet through hole (72) position, place of pump chamber (7), does not communicate with the inner chamber of pump chamber (7);
The left side air inlet duct (81) of the left side air inlet duct (31) of pump chamber lower cover (3), the left side air inlet through hole (72) of pump chamber (7) and pump chamber upper cover (8) is connected, and forms one gas passageway; Same, the right side air inlet duct (81) of the right side air inlet duct (31) of pump chamber lower cover (3), the right side air inlet through hole (72) of pump chamber (7) and pump chamber upper cover (8) is connected, and also forms one gas passageway;
The guiding gutter (32) of pump chamber lower cover (3) communicates with the inner chamber of pump chamber (7), and the outgassing groove (82) of pump chamber upper cover (8) communicates with the inner chamber of pump chamber (7).
2. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, is characterized in that: described supporting base (2) comprises seal ring (21), suction tude (22), steam outlet pipe (23), air storing cavity (24), air outlet (25), scaffold (26) and installation sleeve (27); Suction tude (22) is arranged on the outside of supporting base (2) main body, and the outlet (22-1) of suction tude (22) communicates with air storing cavity (24); Steam outlet pipe (23) is arranged on the outside of supporting base (2) main body, and the suction port of steam outlet pipe (23) is connected with the air outlet (25) of supporting base (2) upper surface; The air outlet (25) of described supporting base (2) upper surface is connected with the cavity between pump casing cover (9) and pump chamber (7).
3. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, it is characterized in that: pump rotor (5) is 0.01-0.03mm with the axial clearance of pump chamber lower cover (3), is 0.01 ~ 0.03mm with the axial clearance of pump chamber upper cover (8); Pump rotor (5) and pump chamber (7) inner chamber substantially horizontal minimum clearance are 0.01 ~ 0.03mm.
4. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, is characterized in that: the shape of the air inlet duct 31 of described pump chamber lower cover (3) is arc; The guiding gutter (32) of pump chamber lower cover (3) comprises connecting groove section (32-1) and outgassing groove section (32-2), and connecting groove section (32-1) connects with air inlet duct (31), and the well width of connecting groove section (32-1) is greater than the width of outgassing groove section (32-2); The shape of outgassing groove section (32-2) is arc, and outgassing groove section (32-2) is the close axis hole (35) of air inlet duct (31) comparatively.
5. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, it is characterized in that: the mounting hole (84) of the mounting hole (33) of pump chamber lower cover (3), the mounting hole (73) of pump chamber (7) and pump chamber upper cover (8) is coaxially set, and is fixedly connected with by fixing pin (100); The locating notch (85) of the locating notch (34) of pump chamber lower cover (3), the locating notch (74) of pump chamber (7) and pump chamber upper cover (8) is coaxially set, and is fixedly connected with by fixing pin (100).
6. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, is characterized in that: the relief opening (83) of described pump chamber upper cover (8) has two, is symmetricly set on the both sides of pump chamber upper cover (8); The relief opening (83) of every side is arranged near the termination of the air inlet duct (81) of this side.
7. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, is characterized in that: described pump rotor (5) comprises blade groove (51), axis hole (52), driving casing mounting hole (53) and pin mouth (54); Driving casing mounting hole (53) and pin mouth (54) are positioned at the side of pump rotor (5) towards supporting base (2);
Driving casing (4) comprises two pins of cylinder-shaped body and main body periphery, the axis hole coaxial line of the axis hole of the central authorities of cylinder-shaped body and pump rotor (5); The cylinder-shaped body of driving casing (4) is placed in driving casing mounting hole (53), and two pins of driving casing (4) insert in the pin mouth (54) of pump rotor (5) respectively.
8. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, it is characterized in that: the inner plane of pump casing cover (9) is arranged one with the circle ring column of pump casing cover (9) coaxial line, form annular silencing groove (91) between this circle ring column and pump casing cover (9).
9. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 8, it is characterized in that: the inside of circle ring column also arranges annular boss (92), annular boss (92) is arranged on the inner plane of pump casing cover (9), and external diameter is identical with the internal diameter of circle ring column.
10. electronic vacuum pump for new energy vehicle brake vacuum booster according to claim 1, is characterized in that: it is the through hole of 2mm that the air inlet through hole (72) of the every side of described pump chamber (7) comprises 3 ~ 6 diameters.
CN201310267734.1A 2013-06-28 2013-06-28 Electronic vacuum pump for new energy vehicle brake vacuum booster Active CN103306979B (en)

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CN107313937A (en) * 2017-08-30 2017-11-03 重庆工商大学 A kind of blade electronics aspiration pump
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CN109915370B (en) * 2019-04-11 2021-02-12 浙江斯柯特新能源科技有限公司 High-power silencing electric vacuum pump

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