CN202883382U

CN202883382U - Electric vacuum pump

Info

Publication number: CN202883382U
Application number: CN 201220567316
Authority: CN
Inventors: 张红生; 蔡文新; 方利志
Original assignee: Dongfeng Motor Corp
Current assignee: Dongfeng Motor Corp
Priority date: 2012-10-30
Filing date: 2012-10-30
Publication date: 2013-04-17
Anticipated expiration: 2022-10-30

Abstract

The utility model relates to an electric vacuum pump which is used for solving the problems of bulky volume, high energy consumption and short service life of a vacuum pump of the existing hybrid or pure electric vehicle. The technical scheme is as follows: the electric vacuum pump comprises a motor and a pump body; the pump body comprises an end cover, a bottom plate, a joint and a rotor which are sequentially sleeved on an output shaft of the motor along the centerline, wherein the section plane of the rotor is circular, a stator is sleeved outside the rotor, and the section plane of the internal wall of the stator is elliptical or nearly elliptical; and a cavity formed among the stator, the rotor, the bottom plate and a cover plate is separated into a plurality of pump chambers of different volumes by a plurality of vanes, the end cover is provided with an air inlet and an air outlet, the air inlet is communicated with a gas buffer chamber in the end cover, the gas buffer chamber is communicated with the cavity through an open air inlet groove in the bottom plate, the cavity is communicated with a closed area formed between the end cover and a shell through an open air outlet groove in the cover plate, and the closed area is communicated with the air outlet of the end cover. The electric vacuum pump has the advantages of simple structure, small volume, low energy consumption, low manufacturing cost and long service life.

Description

Electric vacuum pump

Technical field

The utility model relates to a kind of electric vacuum pump.

Background technique

Along with petroleum resources reduce increasingly, the Abgasgesetz increasingly stringent, energy-saving and emission-reduction have become the key factor that Automobile Design is considered.The consumption of tradition mechanical vacuum pump power is very large, and in engine operation process continuous firing, energy consumption is excessive, has not satisfied present energy consumption of vehicles demand.Simultaneously, the development of mixed power and pure electric vehicle needs a kind of engine power that do not rely on, and the device of the required vacuum of braking can be provided in good time.There is following problem in existing electric vacuum pump: 1, complex structure, bulky, energy consumption is high, manufacture cost is high; 2, be the design of the eccentric pump housing, impact load is large in the operation process, noise is large, and working life is low; 3 are generally wet vacuum pump, and sealing requirements is higher when having increased volume.

Summary of the invention

The purpose of this utility model is in order to solve the problems of the technologies described above, and provides a kind of simple in structure, long service life, volume is little, load is little, energy consumption is low, be suitable for the electric vacuum pump that mixed power and pure electric vehicle use.

Technological scheme comprises motor and the pump housing, the described pump housing comprises along center line and is sleeved on successively end cap, base plate, joint and rotor on the motor output shaft, described rotor profiles is circular, its overcoat has stator, and described stator inner wall section is oval or near oval, along evenly having a plurality of blade grooves on the circumferential surface of described rotor, one end of blade inserts in the blade groove, the other end contacts with stator inner wall, and covering palte seal covers the stator upper surface, and described outer cover suit is on end cap; The cavity that forms between described stator, rotor, base plate and the cover plate is separated into the pump chamber of a plurality of different volumes by a plurality of blades, establish suction port and relief opening on the described end cap, gas buffer chamber in suction port and the end cap is communicated with, the air inlet fluting of described gas buffer chamber on base plate is communicated with cavity, and the district is communicated with described cavity, the described relief opening of distinguishing with on the end cap that is sealed is communicated with through being sealed of forming between the exhaust fluting on the cover plate and end cap and the shell;

The position of described base plate upper air fluting is in the zone at maximum volume place near pump chamber; The position of exhaust fluting is in the zone at minimum volume place on the described cover plate near pump chamber.

Air inlet fluting on the described base plate and the fluting of the exhaust on the cover plate all have two.

Angle between the tangent line of the axis of described blade groove and the circumferential surface of rotor is 60 °～90 °.

The least radius of described rotor radius and stator inner wall is poor to be 0.1-0.3mm.

Described motor is for having brush or brushless electric machine.

Described brush motor comprises motor body and driving plate.

Described rotor and blade adopt graphite material.

Described rotor and blade make after adopting graphite material and insulating varnish.

In the utility model, the inventor improves pump body structure, changed eccentric pump housing design in the past, end cap, base plate, joint and rotor all are sleeved on the output shaft of motor along its center line, when motor output shaft is rotated, can drive joint makes rotor rotate along its center of circle, like this, when rotor rotates, the other end of blade can remain owing to the existence of centrifugal force the contact condition with stator inner wall, like this, a plurality of blade just is separated into a plurality of pump chambers with the cavity that forms between stator, rotor, base plate and the cover plate.Because the inventor designs the section shape attitude of stator inner wall, it is designed to ellipse or approximate ellipsoidal, and the section of rotor is circular, the least radius of preferred described rotor radius and stator inner wall is poor to be 0.1-0.3mm, pump chamber between adjacent like this two blades can be when blade rotation, owing to Volume Changes occurs in the stator wall of corresponding diverse location, when arbitrary adjacent two blades go to the short radius zone of stator, this moment, the volume of these two interlobate pump chambers was minimum, when going to the greatest radius zone of stator, this moment, the volume of these two interlobate pump chambers was maximum.Because stator inner wall is ellipse or approximate ellipsoidal, blade has a plurality of, each pump chamber revolves the process of twice small volume of meeting experience to the variation of large volume that turn around, namely produce the process of twice air-breathing, exhaust, therefore consider to establish two air inlet flutings at base plate, on the cover board establish two exhaust flutings, to satisfy the requirement of inlet and outlet, simultaneously preferred design air inlet is recessed at the position on the base plate, make it approach the position that pump chamber in theory is in maximum volume, and exhaust fluting position on the cover board preferably approach the position that pump chamber in theory is in minimum volume.Shell covers in can play the effect of each parts in the protection pump housing on the end cap, the Qu Youneng that is sealed that forms between shell and end cap simultaneously plays the effect that is communicated with pump chamber and relief opening.

Because blade and rotor are in the height operating condition, centrifugal action can make an end of blade be subjected to the spacing flexible in epitrochanterian blade groove of stator inner wall, the other end can rub with stator inner wall, long-time use requires high to intensity, fracture resistance, the wear-resisting property of blade and rotor, here rotor and blade preferably adopt graphite material, further, will make behind the rotor of graphite material and the blade insulating varnish.Graphite material has high temperature resistant and self-lubricating property, behind the insulating varnish, when satisfying the component requirement of strength, has guaranteed that lubricated and wear-resisting property prolongs the working life of the pump housing on this basis.

Described motor can adopt brush or brushless electric machine, the preferred brushless electric machine that adopts, it has the advantage that efficient height, energy consumption are low, be easy to regulate, further, driving plate on the described brushless electric machine can adopt with the driving plate of position transducer or the driving plate of tape counter, the preferred driving plate that uses tape counter can further reduce volume.

For guaranteeing sealability, the connection between each parts of the pump housing can be installed Sealing as required additional, as install seal ring etc. additional between base plate and end cap; And electric vacuum pump should also should be considered effectiveness in vibration suppression in vehicle, also can install as required vibration damper additional in case of necessity, and as install beam and damping pad core additional at motor output shaft, those skilled in the art are appropriate design as required.

Beneficial effect:

1. the utility model pump housing can be realized under the drive of motor output shaft by suction port suction inlet, relief opening degassing function, adopt the design of the balanced type pump housing, greatly alleviated impact load and the noise in the operation process, prolonged working life (life-span is compared eccentric vacuum pump of the same type, can improve the life-span more than 30%).

2. the utility model electric vacuum pump is dry vacuum pump, volume is less, sealing requirements is low than wet vacuum pump, has reduced manufacture cost, and installation and maintenance are more easy, and (life-span is compared wet vacuum pump of the same type, can reduce the life-span more than 20%, quality can reduce about 30%).

3. the utility model is simple in structure, volume is little, energy consumption is low, long service life, and reliability is high.

Description of drawings

Fig. 1 is the utility model plan view.

Fig. 2 is the structural representation of the utility model motor.

Fig. 3 is the utility model structure figure that pops;

Fig. 4 is the mounting structure schematic representation of rotor, blade and stator.

Fig. 5 is the mounting point schematic representation of air inlet fluting and exhaust fluting.

Fig. 6 is the plan view of end cap.

Gas flow figure when Fig. 7 is the Motorized vacuum pump work, wherein, arrow indicates gas flow.

Wherein, 1-motor body, 1.1-motor output shaft, 2-seal ring, 3-base plate, 4-joint, 5-stator, 6-rotor, 6.1-blade groove, 7-blade, 8-cover plate, 9-housing, 10-pump chamber, 11-exhaust fluting, 12-end cap, 13-driving plate, 14-cavity, 15-suction port, 16-relief opening, 17-gas buffer chamber, 18-air inlet fluting, 19-seal area.

Embodiment

Below in conjunction with accompanying drawing the utility model is further explained explanation:

With reference to Fig. 1-Fig. 3, motor adopts brushless electric machine in the present embodiment, comprise that motor body 1 is sleeved on the driving plate 13(tape counter on the motor output shaft 1.1, position-sensor-free), be set with successively end cap 12 along center line on the described motor output shaft 1.1, base plate 3, joint 4 and rotor 6, be provided with seal ring 2 between described end cap 12 and the base plate 3 with two card sealings between the two, referring to Fig. 4, described rotor 6 overcoats have stator 5, evenly have in a plurality of blade groove 6.1(present embodiments that insert for blades 7 totally 8 on the rotor 6), one end of described blade 7 inserts in the blade groove 6.1, the other end contacts with the inwall of stator 5, angle a between the tangent line of the axis of described blade groove and the circumferential surface of rotor is 60 °～90 °, because under this angle, operation process Leaf 7 is because centrifugal force and positive pressure that stator 5 inwalls are produced is moderate, can be when guaranteeing that blade 7 and inwall are than the friction resistance, obtain better sealability, the inwall section (sagittal plane) of described stator 5 is oval or near oval, the section of rotor 6 (sagittal plane) is circular, the least radius of described rotor radius and stator inner wall is poor to be 0.1-0.3mm, make rotor 6 form Spielpassung at the least radius place of stator 5 inwalls, the upper surface of described stator 5 is coated with upper cover plate 8, base plate 3, rotor 6, stator 5 and the upper cover plate 8 common cavitys 14 that form a ring packing, this cavity 14 is separated into 8 pump chambers 10 by 8 blade 7 correspondences, shell 9 seal closures are on end cap 12, form a seal area 19 between end cap 12 and shell 9, sealing district 19 is communicated with relief opening 16.With reference to Fig. 6, described end cap 12 is provided with suction port 15 and relief opening 16, has gas buffer chamber 17 in the end cap 12, and described suction port 15 is communicated with gas buffer chamber 17.With reference to Fig. 5, Fig. 5 is stator 5, rotor 6, blade 7, and the part assembling plan view (not drawing cover plate 8) of base plate 3, two symmetrical air inlets, 18 positions of slotting have been marked in the drawings on the base plate 3, also with dashed lines has marked the projection position of two exhaust flutings 11 in cavity 14 symmetrical on the corresponding cover plate 8, and the position of described base plate 3 upper airs fluting 18 is in A1 or the A2 zone at maximum volume place near pump chamber 10; The position of exhaust fluting 11 is in B1 or the B2 zone at minimum volume place on the described cover plate 8 near pump chamber 10.The design attitude of air inlet fluting 18 and exhaust fluting 11 can consider to follow following principle, that is: when rotor 6 rotates, when forming second blade in adjacent two blades 7 of arbitrary pump chamber 10 and going to air inlet and slot 18 terminal position, this pump chamber 10 just in time is positioned at A1 or A2 zone, and its volume reaches maximum value; Rotor 6 is rotated further, and second blade in above-mentioned adjacent two blades 7 goes to exhaust when slotting 11 terminal position, and this pump chamber 10 just in time is positioned at B1 or B2 zone, and its volume reaches minimum value.

Because the inwall section of stator 5 is ellipse or approximate ellipsoidal, therefore the pump chamber 10 that forms of two adjacent blades 7 volume (A1 and A2 zone) and the minimum volume (B1 and B2 are regional) that rotate a circle and twice maximum to occur respectively, therefore should be at two air inlet flutings 18 of base plate 3 designs, two exhaust flutings 11 of corresponding design on cover plate 8, so just can form suction port 15, gas buffer chamber 17, air inlet fluting 18, cavity 14, exhaust fluting 11, sealing area 19, relief opening 16 is connected state successively, gas can be along above-mentioned passage by suction port 15 to relief opening 16 one-way flows, realize the function of vacuum pump.Described blade 7 and rotor 6 adopt graphite material, and make behind the insulating varnish after being shaped.The utility model electric vacuum pump adopts the design of the balanced type pump housing, more is applicable to various hybrid vehicle or pure electric vehicle.

Working principle:

After the brushless electric machine starting normal operation, motor output shaft 1.1 rotates, and drives successively joint 4 and rotor 6 rotations.Because centrifugal action, the other end of eight blades 7 all can keep the fit-state with stator 5 inwalls, when arbitrary blade 7 rotate to stator 5 than the semi major axis place time, then blade 7 along blade groove 6.1 parts stretch out to keep blade 7 the other end and the contact condition of inner stator 5 inwalls; When go to stator 5 than the short radius place time, then be subjected to the position-limiting action of stator 5 inwalls, blade 7 bounces back along blade groove 6.1 parts, the degree of depth of blade groove 6.1 should guarantee that blade 7 stretches out under the state can not deviate from maximum, under minimum retracted state also not can with wall generation clamping stagnation, affect the rotation of rotor 6.When 8 blades 7 begin rotation, when the pump chamber 10 that arbitrary adjacent two blades 7 form is rotated to the A1 zone by the B1 zone in the cavity 14, turned centrifugal force and the spacing acting in conjunction of stator 5 inwalls of revolving, blade 7 stretches out gradually, the volume of pump chamber 10 increases gradually, these pump chamber 10 interior formation negative pressure (this moment this pump chamber 10 just in time the fluting of the air inlet on the corresponding base plate 3 18), gas enters gas buffer chamber 17 by suction port 15, be inhaled in the pump chamber 10 through exhaust fluting 18 again, until pump chamber 10 go to A1 when zone volume for maximum (at this moment, second blade that forms pump chamber 10 gone to air inlet when slotting 18 terminal position), finish aspiratory action one time; Rotor 6 is rotated further under the drive of motor output shaft 1.1, this pump chamber 10 is rotated to the B2 zone by the A1 zone in the cavity 14, blade 7 is subjected to the spacing gradually retraction of stator 5 inwalls, the volume of pump chamber 10 reduces gradually, these pump chamber 10 interior formation malleations, the exhaust fluting 11 of gas in the pump chamber 10 on cover plate 8 enters seal area 19, discharge through relief opening 16 again, until pump chamber 10 go to B2 when zone volume for minimum (at this moment, second blade that forms pump chamber 10 gone to exhaust when slotting 11 terminal position), finish exhaust action; The same, rotor 6 is rotated further, and to the A2 area rotation, volume increases pump chamber 10 gradually by the B2 zone, again produces aspiratory action.

In the present embodiment, rotor 6 whenever rotates a circle, single pump chamber is 10 air-breathing, exhaust each twice because 8 blades are arranged, can consist of 8 pump chambers 10, brushless electric machine rotor driven 6 fortune circle, 8 pump chambers 10 add up to the exhaust process of finishing 16 times.

Claims

1. electric vacuum pump, comprise motor and the pump housing, it is characterized in that, the described pump housing comprises along center line and is sleeved on successively end cap, base plate, joint and rotor on the motor output shaft, described rotor profiles is circular, its overcoat has stator, described stator inner wall section is oval or near oval, along evenly having a plurality of blade grooves on the circumferential surface of described rotor, one end of blade inserts in the blade groove, the other end contacts with stator inner wall, and covering palte seal covers the stator upper surface, and described outer cover suit is on end cap; The cavity that forms between described stator, rotor, base plate and the cover plate is separated into the pump chamber of a plurality of different volumes by a plurality of blades, establish suction port and relief opening on the described end cap, gas buffer chamber in suction port and the end cap is communicated with, the air inlet fluting of described gas buffer chamber on base plate is communicated with cavity, and the district is communicated with described cavity, the described relief opening of distinguishing with on the end cap that is sealed is communicated with through being sealed of forming between the exhaust fluting on the cover plate and end cap and the shell.

2. electric vacuum pump as claimed in claim 1 is characterized in that, the position of described base plate upper air fluting is in the zone at maximum volume place near pump chamber; The position of exhaust fluting is in the zone at minimum volume place on the described cover plate near pump chamber.

3. electric vacuum pump as claimed in claim 2 is characterized in that, the air inlet fluting on the described base plate and the fluting of the exhaust on the cover plate all have two.

4. electric vacuum pump as claimed in claim 1 is characterized in that, the angle between the tangent line of the axis of described blade groove and the circumferential surface of rotor is 60 °～90 °.

5. electric vacuum pump as claimed in claim 1 is characterized in that, the least radius of described rotor radius and stator inner wall is poor to be 0.1-0.3mm.

6. electric vacuum pump as claimed in claim 1 is characterized in that, described motor is for having brush or brushless electric machine.

7. electric vacuum pump as claimed in claim 6 is characterized in that, described brush motor comprises motor body and driving plate.

8. such as each described electric vacuum pump of claim 1-7, it is characterized in that described rotor and blade adopt graphite material.

9. electric vacuum pump as claimed in claim 8 is characterized in that, described rotor and blade make after adopting graphite material and insulating varnish.