CN105626465A

CN105626465A - Boost braking vacuum pump

Info

Publication number: CN105626465A
Application number: CN201610082842.5A
Authority: CN
Inventors: 刘孟孟
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-02-06
Filing date: 2016-02-06
Publication date: 2016-06-01

Abstract

The invention discloses a boost braking vacuum pump and belongs to the field of automobile hydraulic brake vacuum boosting. An upper magnet and a lower magnet of the boost braking vacuum pump are disposed on the upper portion and the lower portion of the outside of a negative pressure shell correspondingly; a protective shell is fixed to the negative pressure shell; an air suction pipe is fixed to the lower end of the negative pressure shell; an air outlet valve is fixed to the inside of a central hole of the negative pressure shell; an induced magnetism piston is disposed in the negative pressure shell; a sealing cap seals an air suction channel of an air suction cavity and sealing balls or sealing cones seal an air suction channel of an air extruding cavity; a fixed plug is fixed to the inside of a plug hole in the induced magnetism piston; the sealing balls or the sealing cones are mounted in inner cone holes; and an accommodating hole is formed in the lower end of the induced magnetism piston. The boost braking vacuum pump is compact in structure, small in vibration, high in utilization rate of electric energy, strong in power, suitable for being mounted on vacuum boosting type hydraulic brake electric automobiles and vacuum boosting type hydraulic brake internal combustion engine automobiles for usage, capable of normally generating vacuum and achieving vacuum boosting after an internal combustion engine stops running, good in market prospect of industrialization, high in commercial value and quite convenient to manufacture and use.

Description

Power brake vacuum pump

Technical field

The present invention relates to a kind of power brake vacuum pump for producing vacuum power to the vacuum booster of the master cylinder of automobile.

Background technology

The vacuum pump used on traditional automobile is to adopt bias to lay eggs formula, and laing eggs produces suction when rotated and carry out bleeding and producing vacuum.

Summary of the invention

That the present invention relates in order that provide a kind of electromagnetic linear to pull piston movement to bleed and produce manufacture and the method thereof of the power brake vacuum pump of vacuum.

For achieving the above object, power brake vacuum pump of the present invention mainly includes protecting crust, upper magnet, lower magnet, negative pressure shell, aspirating hole, ball sealer or seals cone, seals cap, answers magnetic piston, fixing plug, internal taper hole, passage, air outlet valve, exhaust tube, field controller, electronic remote controller;

Or, described power brake vacuum pump mainly includes protecting crust, upper magnet, lower magnet, negative pressure shell, aspirating hole, ball sealer or seals cone, seals cap, answers magnetic piston, fixing plug, internal taper hole, passage, air outlet valve, exhaust tube, field controller.

Being provided with upper magnet and lower magnet in protecting crust, upper magnet is fixed on the upper part outside negative pressure shell, and lower magnet is fixed on the lower part outside negative pressure shell, and protecting crust is fixed on the outside protection upper magnet of negative pressure shell and the coil of lower magnet; Below the outside of protecting crust, one side is fixed with foot rest, and the lower end of foot rest protects exhaust tube not oppressed lower than negative pressure shell lower end, and the lower end of foot rest is fixed on the vehicle frame of automobile.

Connect upper magnet and the circuit of lower magnet is connected with the circuit of field controller, the circuit of field controller is connected with electronic remote controller, electronic remote controller is connected with insulated electric conductor, and the electronic signal receptor of field controller, electronic remote controller and electronic remote controller is arranged in protecting crust; Or, connecting upper magnet and the circuit of lower magnet is connected with the circuit of field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust.

Ball sealer it is installed in negative pressure shell or seals cone, seal cap, answer magnetic piston, fixing plug, answering the interior intracavity that magnetic piston is arranged on negative pressure shell to slide up and down; Ball sealer is installed in the internal taper hole below the consent answering in magnetic piston or seals cone, ball sealer or sealing cone can move up and down in internal taper hole, being provided with fixing plug in consent limit ball sealer or seal displacement when cone moves up in internal taper hole, the fixing plug fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts the two ends that jump ring is stuck in the jump-ring slot in consent fixing plug; The sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone can close, when coordinating with the inner conical surface of internal taper hole and seal, the passage bled answered on magnetic piston, and the sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone and the inner conical surface of internal taper hole can open, when separating, the passage bled answered on magnetic piston; Being cased with sealing cap on the periphery sealing neck of the lower end in negative pressure shell, seal cap and can slide up and down on the periphery sealing neck, when sealing cap is in the accommodation hole answering the lower end of magnetic piston upwards to cave in, sealing cap with holding hole has gap; Seal the inner sealing surface in cap to coordinate with the annular sealing surface sealing neck end and can seal or open the passage bled in entrance negative pressure shell; When answering magnetic piston stroking upward, the lumen portion answering the lower sections of negative pressure shell of magnetic piston is pumping chamber; When answering magnetic descent of piston, the lumen portion answering the negative pressure shell of magnetic piston upper part is squish chamber. Being fixed with exhaust tube at the aspirating hole place of the lower end of negative pressure shell, the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Being provided with air outlet valve in the upper end of negative pressure shell, the lower part of air outlet valve is fixed in the centre bore of the overlying one end of negative pressure shell, and the upper surface of negative pressure shell is exposed in the upper end of air outlet valve.

The material of described protecting crust is the material of a kind of type in metal, plastics, nylon, fiberglass or several types; The material of hollow valve body and negative pressure shell adopts the material of a kind of type in metal, plastics, nylon and fiberglass or several types; The material of ball sealer or sealing cone adopts the material of a kind of type in metal, plastics, nylon and rubber or several types; The material sealing cap adopts the material of a kind of type in metal, plastics, nylon and fiberglass or several types; The material answering magnetic piston is able to be subject to the material of magnetic field suction; The material of fixing plug is the material of a kind of type in metal, plastics, nylon, fiberglass, rubber or several types.

Described protecting crust is the hollow cavity of annular, hollow cavity has string holes, the parts installed are installed in hollow cavity in field controller, upper magnet, lower magnet and negative pressure shell and negative pressure shell, or, the parts installed are installed in hollow cavity in electronic remote controller, field controller, upper magnet, lower magnet and negative pressure shell and negative pressure shell; String holes is to allow the hole of insulated electric conductor traverse; The inner of the annular housing of hollow cavity is fixed on negative pressure shell.

For the ease of the processing of protecting crust be easy to accessory to load in protecting crust, described protecting crust is the assembly after segmentation, and after the annular position of protecting crust is divided into two parts, recombinant is together.

The inner chamber of described negative pressure shell is circular cylindrical cavity, and the face of cylinder of cylindrical cavity is smooth curved surface; Upper end on the centrage of inner chamber has centre bore to have aspirating hole traverse negative pressure shell through negative pressure shell, lower end; There is sealing neck protruding upward at the middle part of the lower end in negative pressure shell, the upper end sealing neck is annular sealing surface, the inside sealing neck is aspirating hole, when the inner sealing surface sealing cap does not have with ring packing face seal, aspirating hole is communicated with pumping chamber by air passing hole, and the inner sealing surface sealing cap and the annular sealing surface sealing neck coordinate; Described annular sealing surface is the sealing surface of the flat smooth of annular, and sealing surface is for coordinating with the inner sealing surface sealed in cap; Described sealing cap is the circular pipe type cap body that top seals, and it is inner sealing surface that the inner top of sealing cap divides, and the cylindrical parts near inner sealing surface has air passing hole.

Described air outlet valve includes hollow valve body and ball sealer or seals cone, and hollow valve body is hollow pipe, and internal taper hole is in the middle part of the inner chamber of hollow pipe or middle and lower part, and the internal diameter of the upper part of the internal taper hole in hollow pipe internal diameter big, lower sections of is little; There is return-air sealed end the lower end of hollow valve body, the lower surface of return-air sealed end in the lower end of hollow valve body, upper surface be internal taper hole, the big end of internal taper hole communicates with the upper end of air outlet valve, small end communicates with the lower end of air outlet valve, is provided with ball sealer or seals cone on the inner conical surface of internal taper hole; The sealing of inner conical surface and ball sealer or sealing cone can be opened when entering, from the endoporus of hollow valve body lower end, the air having pressure and form passage.

For the ease of the processing of negative pressure shell be easy to accessory to load in negative pressure shell, described negative pressure shell is the assembly after segmentation; The upper end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration, the upper part of segmentation place is pump cover, lower part is the main body of negative pressure shell, centre bore is on pump cover, and aspirating hole is at the middle part of the main body lower end of negative pressure shell, and the body combination of pump cover and negative pressure shell becomes a composite entity; Or, the lower end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration, the lower part of segmentation place is pump cover, upper part is the main body of negative pressure shell, aspirating hole is at the middle part of pump cover, centre bore is at the middle part of the upper end of the main body of negative pressure shell, and the body combination of pump cover and negative pressure shell becomes a composite entity.

Described to answer magnetic piston be cylindrical iron core, and the periphery of cylindrical iron core is smooth periphery, has the annular groove of depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinate with the inner chamber of negative pressure shell can the inner chamber of sealed negative-pressure shell, and can slide at the interior intracavity of negative pressure shell. There is through hole the cylindrical central portion position of described cylindrical iron core and holds hole, holding hole and run through the lower surface of iron core, through hole runs through above iron core, holds hole below through hole, holding hole to communicate with through hole and pumping chamber, through hole communicates with squish chamber and accommodation hole. The upper part of described through hole runs through the upper surface of iron core, lower part runs through the top in the lower sections of accommodation hole of iron core, the lower part of through hole is passage, the upper part of through hole is consent, and the mid portion between passage and consent is internal taper hole. Concave up sunken accommodation hole is had in the lower end of cylindrical iron core, the circular hole that described accommodation hole communicates with passage, upwards caves in, when answering magnetic piston to arrive the lower end in negative pressure shell, hold hole and be used for holding sealing cap and making sealing cap not collide with answering magnetic piston. Being passage holding above hole, the above of passage is internal taper hole, and the above of internal taper hole is consent; Described passage is the via allowing air pass through, and communicates with accommodation hole and consent; Described consent is to install and the fixing hole filled in, and communicates with accommodation hole and squish chamber.

Described fixing plug be the restriction ball sealer that is arranged in the internal taper hole answered in magnetic piston or seal distance that cone moves up, centre have the plug of passage, described plug to be that centre has the cylinder of through hole or annular ring or card spring coil; When fixing plug is the cylinder that there is through hole centre, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of fixed cylinder; When fixing plug is annular ring, the fixing employing interference fit in consent is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of stationary annular circle; When fixing plug is card spring coil, directly jump ring is stuck in consent.

Described internal taper hole is tapered circular hole, and the face of circular hole is inner conical surface; The small end of internal taper hole under, hold upper greatly, respectively in the hollow valve body of air outlet valve and answer in the through hole of magnetic piston; Inner conical surface coordinates with the sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone, inner conical surface can be sealed under the effect of ball sealer or the gravity sealing cone self, inner conical surface and ball sealer can be opened by suction at ball sealer or when sealing and have suction above cone or seal the passage that cone seals; Ball sealer or sealing cone air pressure above are more big, and ball sealer or sealing cone are more good with the gluing, sealing effect of inner conical surface.

Described sealing cone is cone or cone cylinder, and the annular surface of cone or cone cylinder is tapered male cone (strobilus masculinus); Seal and seal inner conical surface by pressing under the gravity of sealing cone self when the male cone (strobilus masculinus) bored seals with inner conical surface.

Described ball sealer is the surface of spherosome or oval ball, spherosome or oval ball is sealing surface, and sealing surface is smooth sphere; Inner conical surface is sealed by pressing under the gravity of ball sealer when the sphere of ball sealer seals with inner conical surface.

Described field controller is to the interval time producing electromagnetic field for the second time again after control upper magnet and the controller of lower magnet generation electromagnetic field, the time controlling upper magnet and lower magnet generation electromagnetic field and the time length producing electromagnetic field and each generation electromagnetic field.

Described upper magnet and lower magnet are able to produce the solenoid of electromagnetic field.

In order to prevent robber from stealing automobile easily, making robber not have a vacuum servo when driving a car and stopping stealing garage is adopt installing remote device between teacher position key switch and field controller to be switched on and off producing the power-on circuit of electromagnetic field; Described electronic remote controller is to turn on and cuts off the contactor of field controller, and including the switch sections and the electronic telecontrol part that switch on or off circuit, electronic telecontrol part includes remote controller switch and electronic signal receptor; Remote controller switch is carried with for staff, it is simple to staff handles the normal operation of power brake vacuum pump and cuts off the control circuit of power brake vacuum pump; Described electronic remote controller can have in the present invention, it is also possible to does not have.

Described exhaust tube is the hollow pipe of aspirating hole and the vacuum tank connecting negative pressure shell.

Described aspirating hole be air enter the inner chamber of negative pressure shell through air passing hole, in the centre sealing neck, aspirating hole communicates with pumping chamber.

The air extracted in vacuum tank is laid in pumping chamber and is waited to press, and extrudes air at squish intracavity and produces air pressure and discharge outside negative pressure shell; When squish intracavity evacuates gas, pumping chamber communicates with squish chamber; When squish intracavity air-out, pumping chamber is by ball sealer or seals cone and answers the internal taper hole sealing in magnetic piston and disconnect the passage bled in entrance squish chamber.

Described power brake vacuum pump, in the process evacuating gas, does not have return spring in controlling bleed-off passage and going out the one-way check valve of air duct; When pumping chamber evacuates gas, answer the suction that magnetic piston stroking upward produces to open and seal the passage that cap is bled with the sealing and opening sealing neck, be arranged on the ball sealer on the internal taper hole answered in magnetic piston or seal cone under the effect of self gravitation automatic decline return and close the passage bled of entrance squish intracavity and seal; When evacuating gas in squish chamber, it is arranged on the ball sealer on the internal taper hole of air outlet valve or seals cone and utilize the gravity of self make ball sealer or seal and bore automatic decline return and close the passage of the discharge on air outlet valve and seal, answering magnetic descent of piston to make pumping chamber in, to produce pressure and promote ball sealer or seal the up passage bled then opening entrance squish intracavity of cone; When squish chamber air-out, under the effect of outlet pressure, promote the ball sealer on the internal taper hole of air outlet valve or to seal cone up and open the passage given vent to anger of air outlet valve, be arranged on the ball sealer on the internal taper hole answered in magnetic piston or seal cone and utilize the gravity of self make ball sealer or seal and bore automatic decline return and close and answer the passage bled on magnetic piston to seal.

In order to ensure power brake vacuum pump can normal operation, adopt what control field controller with insulated electric conductor teacher position key switch even to connect being switched on and off of circuit; Or, adopt with insulated electric conductor teacher position key switch even and electronic remote controller co-controlling field controller connect being switched on and off of circuit.

In order to ensure that protecting crust can be protected the coil of upper magnet and lower magnet without damage and keeps the shape of protecting crust, the interior intracavity manufacture at protecting crust has the skeleton of support.

In order to enable to answer magnetic piston to promote the air in the pumping chamber in negative pressure shell to enter squish intracavity, the electromagnetic field that lower magnet produces is adopted to answer magnetic piston to move down the power air in pumping chamber being clamp-oned squish chamber as pulling.

During use, the power-on circuit of insulated electric conductor and field controller directly connected by teacher of the opening position key switch, or, pressing the starting button of remote controller switch after the power-on circuit of teacher of the opening position key ON electronic remote controller, electronic signal receptor receives and starts the circuit that signal is followed by leading to electronic remote controller with field controller; Field controller is connected circulation and is connected the power-on circuit generation electromagnetic field of upper magnet and lower magnet, when upper magnet produces electromagnetic field, the captivation of electromagnetic field pulls answers magnetic piston to move up, when answering magnetic piston to start up, it is arranged on the ball sealer on the internal taper hole answered in magnetic piston or seals the passage bled boring descending return under the effect of the gravity of self and close air entrance squish chamber; When answering magnetic piston stroking upward, the up of magnetic piston is answered to make the air of squish intracavity create pressure, there is the air of pressure to promote ball sealer from the internal taper hole that the endoporus of the sealed end of air outlet valve lower end enters in air outlet valve or to seal cone up and open the sealing passage of air outlet valve, make the air of squish intracavity enter after air outlet valve in air; Answer magnetic piston when up, magnetic piston is answered also to make to create in pumping chamber pull of vacuum, pull of vacuum is inhaled movable sealing cap and is opened and make sealing cap and the annular sealing surface sealing neck separate, and the air in vacuum tank enters answering pumping chamber magnetic piston below in negative pressure shell in then through the air passing hole sealed cap from exhaust tube after air inlet.

When answering magnetic piston stroking upward to move into place, the power-on circuit of field controller disconnection upper magnet is followed by the power-on circuit of catharsis magnet, and the electromagnetic field of upper magnet disappears, and the electromagnetic field that lower magnet produces pulls answers magnetic descent of piston; When answering magnetic piston to start descending, descending return under the effect sealing cap negative pressure of vacuum under the effect of self gravitation and in vacuum tank sealing on neck being arranged in negative pressure shell lower end and close the bleed-off passage that enters pumping chamber, ball sealer in air outlet valve or seal cone under the effect of the gravity of self descending return and seal the inner conical surface of air outlet valve, cut off the outlet passageway in squish chamber; Answer magnetic piston when descending, air that magnetic piston is forced in pumping chamber is answered to make air produce internal pressure, the air having pressure enter into from the passage answered in magnetic piston answer the internal taper hole in magnetic piston upwards wash open with internal taper hole seal ball sealer or seal cone displacement after continue up, after the passage in fixing plug enter squish intracavity.

Answer magnetic piston descending when putting in place under the gravitation of the electromagnetic field that lower magnet produces pulls, it is arranged on the ball sealer on the inner conical surface answered in magnetic piston or sealing cone descending inner conical surface under the effect of the gravity of self is shut and made air not return pumping chamber, now, field controller is connected again the power-on circuit of Magnet and is again produced electromagnetic field and pull and answer magnetic piston stroking upward; So circulation be switched on and off circuit, make the electromagnetic field that upper magnet produces pull and answer magnetic piston stroking upward and the electromagnetic field that allows lower magnet produce to pull to answer magnetic descent of piston, constantly the air extraction in vacuum tank is entered in air.

A kind of manufacture method of power brake vacuum pump, it is characterised in that:

During fabrication, protecting crust adopts the material manufacture of a kind of type in metal, plastics, nylon, fiberglass or several types; Hollow valve body and negative pressure shell adopt the material manufacture of a kind of type in metal, plastics, nylon and fiberglass or several types; Ball sealer or sealing cone adopt the material manufacture of a kind of type in metal, plastics, nylon and rubber or several types; Seal cap and adopt the material manufacture of a kind of type in metal, plastics, nylon and fiberglass or several types; Magnetic piston is answered to adopt the material manufacture of the hard to bear magnetic field suction of energy; Fixing plug adopts the material manufacture of a kind of type in metal, plastics, nylon, fiberglass, rubber or several types.

Protecting crust creates the hollow cavity of annular, and hollow cavity manufactures to be had string holes, string holes to create to allow the hole of insulated electric conductor traverse; The parts installed are installed in hollow cavity in field controller, upper magnet, lower magnet and negative pressure shell and negative pressure shell, or, the parts installed are installed in hollow cavity in electronic remote controller, field controller, upper magnet, lower magnet and negative pressure shell and negative pressure shell; The inner of the annular housing of hollow cavity is fixed on negative pressure shell.

In order to convenient for assembly, during fabrication, after protecting crust is divided into two parts manufacture from annular position, recombinant is together for protecting crust.

The inner chamber of negative pressure shell creates the cavity of cylinder, and the periphery of cylindrical cavity creates smooth curved surface; Upper end on the centrage of inner chamber manufactures to have has aspirating hole traverse negative pressure shell through the centre bore of negative pressure shell, lower end manufacture; The middle part of the lower end in negative pressure shell manufactures sealing neck protruding upward, the upper end sealing neck creates annular sealing surface, the inside sealing neck creates aspirating hole, when the inner sealing surface sealing cap does not have with ring packing face seal, aspirating hole is communicated with pumping chamber by air passing hole, and the inner sealing surface sealing cap and the annular sealing surface sealing neck coordinate; Described annular sealing surface creates the sealing surface of the flat smooth of annular; The described cap that seals creates the circular pipe type cap body that top seals, and seals the inner top of cap and divides and create inner sealing surface, and the cylindrical parts manufacture near inner sealing surface has air passing hole.

Air outlet valve creates hollow valve body and ball sealer or seals cone two parts, hollow valve body creates hollow pipe, internal taper hole manufacture is in the middle part of the inner chamber of hollow pipe or middle and lower part, and the internal diameter that the internal diameter that the upper part of the internal taper hole in hollow pipe manufactures is big, lower part manufactures is little; The lower end of hollow valve body manufactures return-air sealed end, the lower surface of return-air sealed end manufactures and creates internal taper hole in the lower end of hollow valve body, upper surface, the big end of internal taper hole communicates with the upper end of air outlet valve, small end communicates with the lower end of air outlet valve, is provided with ball sealer or seals cone on the inner conical surface of internal taper hole; The sealing of inner conical surface and ball sealer or sealing cone can be opened when entering, from the endoporus of hollow valve body lower end, the air having pressure and form passage.

For the ease of the processing of negative pressure shell be easy to accessory to load in negative pressure shell, described negative pressure shell creates the assembly after segmental machining manufactures; The upper end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration manufacture, the upper part of segmentation place creates pump cover, lower part creates the main body of negative pressure shell, centre bore manufactures on pump cover, aspirating hole manufactures at the middle part of the main body lower end of negative pressure shell, and it is a composite entity that pump cover and the main body after negative pressure shell are combined into after manufacturing; Or, the lower end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration manufacture, the lower part of segmentation place creates pump cover, upper part creates the main body of negative pressure shell, aspirating hole manufactures at the middle part of pump cover, it is a composite entity that centre bore manufacture is combined into after the main body of the middle part of the upper end of the main body of negative pressure shell, pump cover and negative pressure shell manufactures.

Answering magnetic piston to create the iron core of cylinder, the periphery of cylindrical iron core creates smooth periphery, manufactures the annular groove having depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinate with the inner chamber of negative pressure shell can the inner chamber of sealed negative-pressure shell, and can slide at the interior intracavity of negative pressure shell. The cylindrical central portion position of described cylindrical iron core manufactures to be had through hole and holds hole, holding hole and run through the lower surface of iron core, through hole runs through above iron core, holds hole and manufactures below through hole, holding hole to communicate with through hole and pumping chamber, through hole communicates with squish chamber and accommodation hole. Described through hole creates that upper part runs through the upper surface of iron core, lower part runs through the top in the lower sections of accommodation hole of iron core, the lower part of through hole creates passage, the upper part of through hole creates consent, and the mid portion between passage and consent creates internal taper hole. Manufacture in the lower end of cylindrical iron core and have concave up sunken accommodation hole, the described hole that holds creates circular hole that communicate, that upwards cave in passage, when answering magnetic piston to arrive the lower end in negative pressure shell, hold hole and can hold sealing cap and make sealing cap not collide with answering magnetic piston. Having passage holding the manufactured above of hole, the manufactured above of passage has internal taper hole, and the manufactured above of internal taper hole has consent; Described passage creates the via allowing air pass through, and communicates with accommodation hole and consent; Described consent creates to be installed and the fixing hole filled in, and communicates with accommodation hole and squish chamber.

Fixing plug creates centre to be had the plug of passage, described plug to create centre to have the cylinder of through hole or annular ring or card spring coil, it is possible to restriction is arranged on the ball sealer in the internal taper hole answered in magnetic piston or seals the distance that cone moves up; When fixing plug creates the cylinder that there is through hole centre, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of fixed cylinder; When fixing plug creates annular ring, the fixing employing interference fit in consent is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of stationary annular circle; When fixing plug creates card spring coil, directly jump ring is stuck in consent.

Described internal taper hole creates tapered circular hole, and the face of circular hole creates inner conical surface; The small end of internal taper hole under, hold upper greatly, manufacture respectively in the hollow valve body of air outlet valve and answer in the through hole of magnetic piston; Inner conical surface can be sealed under the effect of ball sealer or the gravity sealing cone self, inner conical surface and ball sealer can be opened by suction at ball sealer or when sealing and have suction above cone or seal the passage that cone seals; Ball sealer or sealing cone air pressure above are more big, and ball sealer or sealing cone are more good with the gluing, sealing effect of inner conical surface.

Sealing cone and create cone or cone cylinder, the annular surface of cone or cone cylinder creates tapered male cone (strobilus masculinus); Seal and seal inner conical surface by pressing under the gravity of sealing cone self when the male cone (strobilus masculinus) bored seals with inner conical surface.

Ball sealer creates the surface of spherosome or oval ball, spherosome or oval ball and creates sealing surface, and sealing surface creates smooth sphere; Inner conical surface is sealed by pressing under the self gravitation of ball sealer when the sphere of ball sealer seals with inner conical surface.

Field controller creates and controls upper magnet and lower magnet and produce the controller of electromagnetic field, control upper magnet and lower magnet produce time of electromagnetic field and produce the time length of electromagnetic field and produce electromagnetic field every time after to the interval time producing electromagnetic field for the second time again.

Upper magnet and lower magnet create the solenoid that can produce electromagnetic field.

In order to prevent robber from stealing automobile easily, making robber not have a vacuum servo when driving a car and stopping stealing garage is adopt installing remote device between teacher position key switch and field controller to be switched on and off producing the power-on circuit of electromagnetic field; Described electronic remote controller creates the contactor being switched on and off field controller, and including the switch sections and the electronic telecontrol part that switch on or off circuit, electronic telecontrol part includes remote controller switch and electronic signal receptor; Described electronic remote controller can have in the present invention, it is also possible to does not have.

Exhaust tube creates the hollow pipe of aspirating hole and the vacuum tank connecting negative pressure shell.

Aspirating hole create air enter negative pressure shell inner chamber through via, manufacture in the centre sealing neck; Manufacturing in the upper end of the aspirating hole sealed in neck and have annular sealing surface, when being fitted without sealing cap on the annular sealing surface sealing neck, pumping chamber communicates with aspirating hole.

In order to ensure that protecting crust can be protected the coil of upper magnet and lower magnet without damage and keeps the shape of protecting crust, the interior intracavity manufacture at protecting crust has the skeleton of support;

Being provided with upper magnet and lower magnet in protecting crust, upper magnet is fixed on the upper part outside negative pressure shell, and lower magnet is fixed on the lower part outside negative pressure shell, and protecting crust is fixed on the outside protection upper magnet of negative pressure shell and the coil of lower magnet; Below the outside of protecting crust, one side is fixed with foot rest, and the lower end of foot rest protects exhaust tube not oppressed lower than negative pressure shell lower end, and the lower end of foot rest is fixed on the vehicle frame of automobile. Connect upper magnet and the circuit of lower magnet is connected with the circuit of field controller, the circuit of field controller is connected with electronic remote controller, electronic remote controller is connected with insulated electric conductor, and the electronic signal receptor of field controller, electronic remote controller and electronic remote controller is arranged in protecting crust; Or, connecting upper magnet and the circuit of lower magnet is connected with the circuit of field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust. Sealing cap is installed in negative pressure shell, answers magnetic piston, ball sealer or seal cone, fixing plug, answer the interior intracavity that magnetic piston is arranged on negative pressure shell to slide up and down; Ball sealer is installed in the internal taper hole below the consent answering in magnetic piston or seals cone, ball sealer or sealing cone can move up and down in internal taper hole, being provided with fixing plug in consent limit ball sealer or seal displacement when cone moves up in internal taper hole, the fixing plug fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts the two ends that jump ring is stuck in the jump-ring slot in consent fixing plug; The sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone can close, when coordinating with the inner conical surface of internal taper hole and seal, the passage bled answered on magnetic piston, and the sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone and the inner conical surface of internal taper hole can open, when separating, the passage bled answered on magnetic piston; Being cased with sealing cap on the periphery sealing neck of the lower end in negative pressure shell, seal cap and can slide up and down on the periphery sealing neck, when sealing cap is in the accommodation hole answering the lower end of magnetic piston upwards to cave in, sealing cap with holding hole has gap; Seal the inner sealing surface in cap to coordinate with the annular sealing surface sealing neck end and can seal or open the passage bled in entrance negative pressure shell; When answering magnetic piston stroking upward, the lumen portion answering the lower sections of negative pressure shell of magnetic piston is pumping chamber; When answering magnetic descent of piston, the lumen portion answering the negative pressure shell of magnetic piston upper part is squish chamber. Being fixed with exhaust tube at the aspirating hole place of the lower end of negative pressure shell, the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Being provided with air outlet valve in the upper end of negative pressure shell, the lower part of air outlet valve is fixed in the centre bore of the overlying one end of negative pressure shell, and the upper surface of negative pressure shell is exposed in the upper end of air outlet valve.

The compact conformation of power brake vacuum pump of the present invention, vibrate little, utilization rate of electrical is high, powerful, the electric automobile and the internal-combustion engines vehicle that are suitable for vacuum servo formula hydraulic braking are installed and used, and also are able to produce vacuum normally and realize vacuum servo after internal combustion engine shuts down; The market prospect of industrialization is good, commercial value is high, manufactures and uses all very convenient.

Accompanying drawing explanation

Fig. 1 and Fig. 2 is the structural representation of power brake vacuum pump;

Fig. 3 is the structural representation answering magnetic piston;

Fig. 4 is the schematic appearance of the top view answering magnetic piston;

Shown in figure: protecting crust 1, foot rest 2, exhaust tube 3, negative pressure shell 4, hollow valve body 5, lower magnet 6, answer magnetic piston 7, ball sealer 8 or seal cone 8, fixing plug 10, seal cap 11, air passing hole 12, upper magnet 13, hold hole 15, passage 16, internal taper hole 17, consent 18, inner conical surface 19.

Detailed description of the invention

Power brake vacuum pump of the present invention mainly includes protecting crust 1, upper magnet 13, lower magnet 6, negative pressure shell 4, aspirating hole, ball sealer 8 or seals cone 8, seals cap 11, answers magnetic piston 7, fixing plug 10, internal taper hole 17, passage 16, air outlet valve, exhaust tube 3, field controller, electronic remote controller; Or including protecting crust 1, upper magnet 13, lower magnet 6, negative pressure shell 4, aspirating hole, ball sealer 8 or sealing cone 8, sealing cap 11, answer magnetic piston 7, fixing plug 10, internal taper hole 17, passage 16, air outlet valve, exhaust tube 3, field controller.

Upper magnet 13 and lower magnet 6 are installed in protecting crust 1, upper magnet 13 is fixed on the upper part outside negative pressure shell 4, lower magnet 6 is fixed on the lower part outside negative pressure shell 4, and protecting crust 1 is fixed on the outside protection upper magnet 13 of negative pressure shell 4 and the coil of lower magnet 6; Below the outside of protecting crust 1, one side is fixed with foot rest 2, and the lower end of foot rest 2 protects exhaust tube 3 not oppressed lower than negative pressure shell 4 lower end, and the lower end of foot rest 2 is fixed on the vehicle frame of automobile.

Connect upper magnet 13 and the circuit of lower magnet 6 is connected with the circuit of field controller, the circuit of field controller is connected with electronic remote controller, electronic remote controller is connected with insulated electric conductor, and the electronic signal receptor of field controller, electronic remote controller and electronic remote controller is arranged in protecting crust 1; Or, connecting upper magnet 13 and the circuit of lower magnet 6 is connected with the circuit of field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust 1.

Ball sealer 8 it is installed in negative pressure shell 4 or seals cone 8, seal cap 11, answer magnetic piston 7, fixing plug 10, answering the interior intracavity that magnetic piston 7 is arranged on negative pressure shell 4 to slide up and down; Ball sealer 8 is installed in the internal taper hole 17 below the consent 18 answered in magnetic piston 7 or seals cone 8, ball sealer 8 or sealing cone 8 can move up and down in internal taper hole 17, being provided with fixing plug 10 in consent 18 to limit ball sealer 8 or to seal displacement when cone 8 moves up in internal taper hole 17, the fixing plug 10 fixing employing interference fit in consent 18 are fixed or threaded engagement is fixed or adopt the two ends that jump ring is stuck in the jump-ring slot in consent 18 fixing plug 10; The sphere of ball sealer 8 or the male cone (strobilus masculinus) of sealing cone 8 can close, when coordinating with the inner conical surface 19 of internal taper hole 17 and seal, the passage bled answered on magnetic piston 7, and the sphere of ball sealer 8 or the male cone (strobilus masculinus) of sealing cone 8 and the inner conical surface 19 of internal taper hole 17 can open, when separating, the passage bled answered on magnetic piston 7; The periphery sealing neck of the lower end in negative pressure shell 4 is cased with sealing cap 11, seal cap 11 can slide up and down on the periphery sealing neck, when sealing cap 11 is in the accommodation hole 15 answering the lower end of magnetic piston 7 upwards to cave in, sealing cap 11 with holding hole 15 has gap; Seal the inner sealing surface in cap 11 to coordinate with the annular sealing surface sealing neck end and can seal or open the passage bled in entrance negative pressure shell 4; When answering magnetic piston 7 up, the lumen portion answering the lower sections of negative pressure shell 4 of magnetic piston 7 is pumping chamber; When answering magnetic piston 7 descending, the lumen portion answering the negative pressure shell 4 of magnetic piston 7 upper part is squish chamber. Being fixed with exhaust tube 3 at the aspirating hole place of the lower end of negative pressure shell 4, the other end of exhaust tube 3 is connected with vacuum tank, and the endoporus of exhaust tube 3 communicates with aspirating hole and vacuum tank; Being provided with air outlet valve in the upper end of negative pressure shell 4, the lower part of air outlet valve is fixed in the centre bore of the overlying one end of negative pressure shell 4, and the upper surface of negative pressure shell 4 is exposed in the upper end of air outlet valve.

During fabrication, protecting crust 1 adopts the material manufacture of a kind of type in metal, plastics, nylon, fiberglass, rubber or several types, when protecting crust 1 when adopting elastomeric material to manufacture or after manufacture shaping is soft-shell, it is made to float on gas face first in use the inner chamber inflation of protecting crust 1; Hollow valve body 5 and negative pressure shell 4 adopt the material manufacture of a kind of type in metal, plastics, nylon and fiberglass or several types; Ball sealer 8 or sealing cone 8 adopt the material manufacture of a kind of type in metals, plastics, nylon and rubber or several types; Seal cap 11 and adopt the material manufacture of a kind of type in metal, plastics, nylon and fiberglass or several types; Magnetic piston 7 is answered to adopt the material manufacture of the hard to bear magnetic field suction of energy; Fixing plug 10 adopts the material manufacture of a kind of type in metal, plastics, nylon, fiberglass, rubber or several types.

Protecting crust 1 creates the hollow cavity of annular, and hollow cavity manufactures to be had string holes, string holes to create to allow the hole of insulated electric conductor traverse; The parts installed are installed in hollow cavity in field controller, upper magnet 13, lower magnet 6 and negative pressure shell 4 and negative pressure shell 4, or, the parts installed are installed in hollow cavity in electronic remote controller, field controller, upper magnet 13, lower magnet 6 and negative pressure shell 4 and negative pressure shell 4; The inner of the annular housing of hollow cavity is fixed on negative pressure shell 4.

In order to convenient for assembly, during fabrication, after protecting crust 1 is divided into two parts manufacture from annular position, recombinant is together for protecting crust 1.

The inner chamber of negative pressure shell 4 creates the cavity of cylinder, and the periphery of cylindrical cavity creates smooth curved surface; Upper end on the centrage of inner chamber manufactures to have has aspirating hole traverse negative pressure shell 4 through the centre bore of negative pressure shell 4, lower end manufacture; The middle part of the lower end in negative pressure shell 4 manufactures sealing neck protruding upward, the upper end sealing neck creates annular sealing surface, the inside sealing neck creates aspirating hole, when the inner sealing surface sealing cap 11 does not have with ring packing face seal, aspirating hole is communicated with pumping chamber by air passing hole 12, and the inner sealing surface sealing cap 11 and the annular sealing surface sealing neck coordinate; Described annular sealing surface creates the sealing surface of the flat smooth of annular; The described cap 11 that seals creates the circular pipe type cap body that top seals, and seals the inner top of cap 11 and divides and create inner sealing surface, and the cylindrical parts manufacture near inner sealing surface has air passing hole 12.

Air outlet valve creates hollow valve body 5 and ball sealer 8 or seals cone 8 two parts, hollow valve body 5 creates hollow pipe, internal taper hole 17 manufactures in the middle part of inner chamber of hollow pipe or middle and lower part, and the internal diameter that the internal diameter that the upper part of the internal taper hole 17 in hollow pipe manufactures is big, lower part manufactures is little; The lower end of hollow valve body 5 manufactures return-air sealed end, the lower surface of return-air sealed end manufactures in the lower end of hollow valve body 5, upper surface creates internal taper hole 17, the big end of internal taper hole 17 communicates with the upper end of air outlet valve, small end communicates with the lower end of air outlet valve, is provided with ball sealer 8 or seals cone 8 on the inner conical surface 19 of internal taper hole 17; The sealing of inner conical surface 19 and ball sealer 8 or sealing cone 8 can be opened when entering, from the endoporus of hollow valve body 5 lower end, the air having pressure and form passage.

For the ease of the processing of negative pressure shell 4 be easy to accessory to load in negative pressure shell 4, described negative pressure shell 4 creates the assembly after segmental machining manufactures; The upper end of the cylindrical cavity body portion in negative pressure shell 4 is divided into two-stage nitration manufacture, the upper part of segmentation place creates pump cover, lower part creates the main body of negative pressure shell 4, centre bore manufactures on pump cover, aspirating hole manufactures at the middle part of the main body lower end of negative pressure shell 4, and it is a composite entity that pump cover and the main body after negative pressure shell 4 are combined into after manufacturing; Or, the lower end of the cylindrical cavity body portion in negative pressure shell 4 is divided into two-stage nitration manufacture, the lower part of segmentation place creates pump cover, upper part creates the main body of negative pressure shell 4, aspirating hole manufactures at the middle part of pump cover, it is a composite entity that centre bore manufacture is combined into after the main body of the middle part of the upper end of the main body of negative pressure shell 4, pump cover and negative pressure shell 4 manufactures.

Answering magnetic piston 7 to create the iron core of cylinder, the periphery of cylindrical iron core creates smooth periphery, manufactures the annular groove having depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinate with the inner chamber of negative pressure shell 4 can the inner chamber of sealed negative-pressure shell 4, and can slide at the interior intracavity of negative pressure shell 4. The cylindrical central portion position of described cylindrical iron core manufactures to be had through hole and holds hole 15, hold hole 15 and run through the lower surface of iron core, through hole runs through above iron core, hold hole 15 and manufacture below through hole, holding hole 15 to communicate with through hole and pumping chamber, through hole communicates with squish chamber and accommodation hole 15. Described through hole creates that upper part runs through the upper surface of iron core, lower part runs through the top in the lower sections of accommodation hole 15 of iron core, the lower part of through hole creates passage 16, the upper part of through hole creates consent 18, and the mid portion between passage 16 and consent 18 creates internal taper hole 17. Manufacture in the lower end of cylindrical iron core and have concave up sunken accommodation hole 15, the described hole 15 that holds creates circular hole that communicate, that upwards cave in passage 16, when answering magnetic piston 7 to arrive the lower end in negative pressure shell 4, hold hole 15 and can hold sealing cap 11 and make sealing cap 11 not collide with answering magnetic piston 7. Having passage 16 holding the manufactured above of hole 15, the manufactured above of passage 16 has internal taper hole 17, and the manufactured above of internal taper hole 17 has consent 18; Described passage 16 creates the via allowing air pass through, and communicates with accommodation hole 15 and consent 18; Described consent 18 creates the hole installed and fix plug 10, communicates with accommodation hole 15 and squish chamber.

Fixing plug 10 creates centre to be had the plug of passage 16, described plug to create centre to have the cylinder of through hole or annular ring or card spring coil, it is possible to restriction is arranged on the ball sealer 8 in the internal taper hole 17 answered in magnetic piston 7 or seals the distances that cone 8 moves up; When fixing plug 10 creates the cylinder that there is through hole centre, the fixing employing interference fit in consent 18 is fixed or threaded engagement is fixed or adopts jump ring to be stuck in the jump-ring slot in consent 18 two ends of fixed cylinder; When fixing plug 10 creates annular ring, the two ends that the fixing employing interference fit in consent 18 is fixed or adopted jump ring to be stuck in the jump-ring slot in consent 18 stationary annular circle; When fixing plug 10 creates card spring coil, directly jump ring is stuck in consent 18.

Described internal taper hole 17 creates tapered circular hole, and the face of circular hole creates inner conical surface 19; The small end of internal taper hole 17 under, hold upper greatly, manufacture respectively in the hollow valve body 5 of air outlet valve and answer in the through hole of magnetic piston 7; Inner conical surface 19 can be sealed under the effect of ball sealer 8 or the gravity sealing cone 8 self, inner conical surface 19 and ball sealer 8 or the passages sealing cone 8 sealing can be opened at ball sealer 8 or when sealing and have suction above cone 8 by suction; Ball sealer 8 or sealing cone 8 air pressure above are more big, and the gluing, sealing effect of ball sealer 8 or sealing cone 8 and inner conical surface 19 is more good.

Sealing cone 8 and create cone or cone cylinder, the annular surface of cone or cone cylinder creates tapered male cone (strobilus masculinus); Seal and seal inner conical surface 19 by pressing under the gravity of sealing cone 8 self when the male cone (strobilus masculinus) boring 8 seals with inner conical surface 19.

Ball sealer 8 creates the surface of spherosome or oval ball, spherosome or oval ball and creates sealing surface, and sealing surface creates smooth sphere; Inner conical surface 19 is sealed by pressing under the self gravitation of ball sealer 8 when the sphere of ball sealer 8 and inner conical surface 19 seal.

Field controller creates and controls upper magnet 13 and lower magnet 6 and produce the controller of electromagnetic field, control upper magnet 13 and lower magnet 6 produce time of electromagnetic field and produce the time length of electromagnetic field and produce electromagnetic field every time after to the interval time producing electromagnetic field for the second time again.

Upper magnet 13 and lower magnet 6 create the solenoid that can produce electromagnetic field.

Exhaust tube 3 creates the hollow pipe of aspirating hole and the vacuum tank connecting negative pressure shell 4.

Aspirating hole create air enter negative pressure shell 4 inner chamber through via, manufacture in the centre sealing neck; Manufacturing in the upper end of the aspirating hole sealed in neck and have annular sealing surface, when being fitted without sealing cap 11 on the annular sealing surface sealing neck, pumping chamber communicates with aspirating hole.

In order to ensure that protecting crust 1 can be protected the coil of upper magnet 13 and lower magnet 6 without damage and keeps the shape of protecting crust 1, the interior intracavity manufacture at protecting crust 1 has the skeleton of support;

In order to make to answer magnetic piston 7 that the air in the pumping chamber in negative pressure shell 4 can be promoted to enter squish intracavity, the electromagnetic field that lower magnet 6 produces is adopted to answer magnetic piston 7 to move down the power air in pumping chamber being clamp-oned squish chamber as pulling.

The air extracted in vacuum tank is laid in pumping chamber and is waited to press, and extrudes air at squish intracavity and produces air pressure and discharge outside negative pressure shell; When squish intracavity evacuates gas, pumping chamber communicates with squish chamber; When squish intracavity air-out, pumping chamber by ball sealer 8 or seal cone 8 seal with the internal taper hole 17 answered in magnetic piston 7 and disconnect enter squish chamber the passage bled.

Described power brake vacuum pump, in the process evacuating gas, does not have return spring in controlling bleed-off passage and going out the one-way check valve of air duct; When pumping chamber evacuates gas, the suction answering the up generation of magnetic piston 7 is opened and is sealed cap 11 and open the passage bled with sealing the sealing of neck, be arranged on the ball sealer 8 on the internal taper hole 17 answered in magnetic piston 7 or seal cone 8 under the effect of self gravitation automatic decline return and close the passage bled of entrance squish intracavity and seal; When evacuating gas in squish chamber, it is arranged on the ball sealer 8 on the internal taper hole 17 of air outlet valve or seals cone 8 and utilize the gravity of self make ball sealer 8 or seal cone 8 automatic decline returns and close the passage of the discharge on air outlet valve and seal, answering magnetic piston 7 descending and make to produce pumping chamber in pressure and promote ball sealer 8 or seal and bore the 8 up passages bled then opening entrance squish intracavity; When squish chamber air-out, under the effect of outlet pressure, promote the ball sealer 8 on the internal taper hole 17 of air outlet valve or to seal cone 8 up and open the passage given vent to anger of air outlet valve, be arranged on the ball sealer 8 on the internal taper hole 17 answered in magnetic piston 7 or seal cone 8 and utilize the gravity of self make ball sealer 8 or seal cone 8 automatic decline returns and close and answer the passage bled on magnetic piston 7 to seal.

During use, the power-on circuit of insulated electric conductor and field controller directly connected by teacher of the opening position key switch, or, pressing the starting button of remote controller switch after the power-on circuit of teacher of the opening position key ON electronic remote controller, electronic signal receptor receives and starts the circuit that signal is followed by leading to electronic remote controller with field controller; Field controller is connected circulation and is connected the power-on circuit generation electromagnetic field of upper magnet 13 and lower magnet 6, when upper magnet 13 produces electromagnetic field, the captivation of electromagnetic field pulls answers magnetic piston 7 to move up, when answering magnetic piston 7 to start up, be arranged on the ball sealer 8 on the internal taper hole 17 answered in magnetic piston 7 or seal cone 8 under the effect of the gravity of self descending return and close air enter squish chamber the passage bled; When answering magnetic piston 7 up, the up of magnetic piston 7 is answered to make the air of squish intracavity create pressure, there is the air of pressure to promote ball sealer 8 from the internal taper hole 17 that the endoporus of the sealed end of air outlet valve lower end enters in air outlet valve or to seal cone 8 up and open the sealing passage of air outlet valve, make the air of squish intracavity enter after air outlet valve in air; Answer magnetic piston 7 when up, magnetic piston 7 is answered also to make to create in pumping chamber pull of vacuum, pull of vacuum is inhaled movable sealing cap 11 and is opened and make sealing cap 11 and the annular sealing surface sealing neck separate, and the air in vacuum tank enters answering pumping chamber magnetic piston 7 below in negative pressure shell 4 in then through the air passing hole 12 sealed cap 11 from exhaust tube 3 after air inlet.

When answering that magnetic piston 7 is up to be moved into place, field controller disconnects the power-on circuit of upper magnet 13 and is followed by the power-on circuit of catharsis magnet 6, and the electromagnetic field of upper magnet 13 disappears, and the electromagnetic field that lower magnet 6 produces pulls answers magnetic piston 7 descending; When answering magnetic piston 7 to start descending, descending return under the effect sealing the cap 11 negative pressure of vacuum under the effect of self gravitation and in vacuum tank sealing on neck being arranged in negative pressure shell 4 lower end and close the bleed-off passage that enters pumping chamber, ball sealer 8 in air outlet valve or seal cone 8 under the effect of the gravity of self descending return and seal the inner conical surface 19 of air outlet valve, cut off the outlet passageway in squish chamber; Answer magnetic piston 7 when descending, air that magnetic piston 7 is forced in pumping chamber is answered to make air produce internal pressure, the air having pressure enter into from the passage 16 answered in magnetic piston 7 answer the internal taper hole 17 in magnetic piston 7 upwards wash open with internal taper hole 17 seal ball sealer 8 or seal cone 8 displacement after continue up, after the passage 16 in fixing plug 10 enter squish intracavity.

Answer magnetic piston 7 descending when putting in place under the gravitation of the electromagnetic field that lower magnet 6 produces pulls, it is arranged on the ball sealer 8 on the inner conical surface 19 answered in magnetic piston 7 or sealing cone 8 descending inner conical surface 19 under the effect of the gravity of self is shut and made air not return pumping chamber, now, field controller is connected again the power-on circuit of Magnet and is again produced electromagnetic field and pull and answer magnetic piston 7 up; So circulation be switched on and off circuit, make the electromagnetic field that upper magnet 13 produces pull to answer magnetic piston 7 up and allow the electromagnetic field that lower magnet 6 produces pull and answer magnetic piston 7 descending, constantly the air extraction in vacuum tank entered in air.

Claims

1. a power brake vacuum pump, it is characterised in that: described power brake vacuum pump includes protecting crust, upper magnet, lower magnet, negative pressure shell, aspirating hole, sealing cone, seals cap, answers magnetic piston, fixing plug, internal taper hole, passage, air outlet valve, exhaust tube, field controller;

Being provided with upper magnet and lower magnet in protecting crust, upper magnet is fixed on the upper part outside negative pressure shell, and lower magnet is fixed on the lower part outside negative pressure shell, and protecting crust is fixed on the outside protection upper magnet of negative pressure shell and the coil of lower magnet; Below the outside of protecting crust, one side is fixed with foot rest, and the lower end of foot rest protects exhaust tube not oppressed lower than negative pressure shell lower end, and the lower end of foot rest is fixed on the vehicle frame of automobile;

Connecting upper magnet and the circuit of lower magnet is connected with the circuit of field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust;

Sealing cone is installed in negative pressure shell, seals cap, answers magnetic piston, fixing plug, answer the interior intracavity that magnetic piston is arranged on negative pressure shell to slide up and down; Sealing cone is installed in the internal taper hole below the consent answering in magnetic piston, seal cone can move up and down in internal taper hole, being provided with fixing plug in consent and limit the displacement sealed when cone moves up in internal taper hole, the fixing plug fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts the two ends that jump ring is stuck in the jump-ring slot in consent fixing plug; The sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone can close, when coordinating with the inner conical surface of internal taper hole and seal, the passage bled answered on magnetic piston, and the sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone and the inner conical surface of internal taper hole can open, when separating, the passage bled answered on magnetic piston; Being cased with sealing cap on the periphery sealing neck of the lower end in negative pressure shell, seal cap and can slide up and down on the periphery sealing neck, when sealing cap is in the accommodation hole answering the lower end of magnetic piston upwards to cave in, sealing cap with holding hole has gap; Seal the inner sealing surface in cap to coordinate with the annular sealing surface sealing neck end and can seal or open the passage bled in entrance negative pressure shell; When answering magnetic piston stroking upward, the lumen portion answering the lower sections of negative pressure shell of magnetic piston is pumping chamber; When answering magnetic descent of piston, the lumen portion answering the negative pressure shell of magnetic piston upper part is squish chamber; Being fixed with exhaust tube at the aspirating hole place of the lower end of negative pressure shell, the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Being provided with air outlet valve in the upper end of negative pressure shell, the lower part of air outlet valve is fixed in the centre bore of the overlying one end of negative pressure shell, and the upper surface of negative pressure shell is exposed in the upper end of air outlet valve;

Described protecting crust is the hollow cavity of annular, and hollow cavity has string holes, is provided with in field controller, upper magnet, lower magnet and negative pressure shell and negative pressure shell the parts installed in hollow cavity, and string holes is to allow the hole of insulated electric conductor traverse; The inner of the annular housing of hollow cavity is fixed on negative pressure shell;

For the ease of the processing of protecting crust be easy to accessory to load in protecting crust, described protecting crust is the assembly after segmentation, and after the annular position of protecting crust is divided into two parts, recombinant is together;

The inner chamber of described negative pressure shell is circular cylindrical cavity, and the face of cylinder of cylindrical cavity is smooth curved surface; Upper end on the centrage of inner chamber has centre bore to have aspirating hole traverse negative pressure shell through negative pressure shell, lower end; There is sealing neck protruding upward at the middle part of the lower end in negative pressure shell, the upper end sealing neck is annular sealing surface, the inside sealing neck is aspirating hole, when the inner sealing surface sealing cap does not have with ring packing face seal, aspirating hole is communicated with pumping chamber by air passing hole, and the inner sealing surface sealing cap and the annular sealing surface sealing neck coordinate; Described annular sealing surface is the sealing surface of the flat smooth of annular, and sealing surface is for coordinating with the inner sealing surface sealed in cap; Described sealing cap is the circular pipe type cap body that top seals, and it is inner sealing surface that the inner top of sealing cap divides, and the cylindrical parts near inner sealing surface has air passing hole;

Described air outlet valve includes hollow valve body and seals cone, and hollow valve body is hollow pipe, and internal taper hole is in the middle part of the inner chamber of hollow pipe or middle and lower part, and the internal diameter of the upper part of the internal taper hole in hollow pipe internal diameter big, lower sections of is little; There is return-air sealed end the lower end of hollow valve body, the lower surface of return-air sealed end in the lower end of hollow valve body, upper surface be internal taper hole, the big end of internal taper hole communicates with the upper end of air outlet valve, small end communicates with the lower end of air outlet valve, is provided with sealing cone on the inner conical surface of internal taper hole; Inner conical surface can be opened when entering, from the endoporus of hollow valve body lower end, the air having pressure and form passage with sealing the sealing bored;

For the ease of the processing of negative pressure shell be easy to accessory to load in negative pressure shell, described negative pressure shell is the assembly after segmentation; The upper end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration, the upper part of segmentation place is pump cover, lower part is the main body of negative pressure shell, centre bore is on pump cover, and aspirating hole is at the middle part of the main body lower end of negative pressure shell, and the body combination of pump cover and negative pressure shell becomes a composite entity; Or, the lower end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration, the lower part of segmentation place is pump cover, upper part is the main body of negative pressure shell, aspirating hole is at the middle part of pump cover, centre bore is at the middle part of the upper end of the main body of negative pressure shell, and the body combination of pump cover and negative pressure shell becomes a composite entity;

Described to answer magnetic piston be cylindrical iron core, and the periphery of cylindrical iron core is smooth periphery, has the annular groove of depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinate with the inner chamber of negative pressure shell can the inner chamber of sealed negative-pressure shell, and can slide at the interior intracavity of negative pressure shell; There is through hole the cylindrical central portion position of described cylindrical iron core and holds hole, holding hole and run through the lower surface of iron core, through hole runs through above iron core, holds hole below through hole, holding hole to communicate with through hole and pumping chamber, through hole communicates with squish chamber and accommodation hole; The upper part of described through hole runs through the upper surface of iron core, lower part runs through the top in the lower sections of accommodation hole of iron core, the lower part of through hole is passage, the upper part of through hole is consent, and the mid portion between passage and consent is internal taper hole; Concave up sunken accommodation hole is had in the lower end of cylindrical iron core, the circular hole that described accommodation hole communicates with passage, upwards caves in, when answering magnetic piston to arrive the lower end in negative pressure shell, hold hole and be used for holding sealing cap and making sealing cap not collide with answering magnetic piston; Being passage holding above hole, the above of passage is internal taper hole, and the above of internal taper hole is consent; Described passage is the via allowing air pass through, and communicates with accommodation hole and consent; Described consent is to install and the fixing hole filled in, and communicates with accommodation hole and squish chamber;

Described fixing plug be restriction be arranged in the internal taper hole answered in magnetic piston seal distance that cone moves up, centre have the plug of passage, described plug to be that centre has the cylinder of through hole or annular ring or card spring coil; When fixing plug is the cylinder that there is through hole centre, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of fixed cylinder; When fixing plug is annular ring, the fixing employing interference fit in consent is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of stationary annular circle; When fixing plug is card spring coil, directly jump ring is stuck in consent;

Described internal taper hole is tapered circular hole, and the face of circular hole is inner conical surface; The small end of internal taper hole under, hold upper greatly, respectively in the hollow valve body of air outlet valve and answer in the through hole of magnetic piston; Inner conical surface coordinates with the male cone (strobilus masculinus) sealing cone, can seal inner conical surface under the effect sealing the gravity boring self, can open, by suction, the passage that inner conical surface seals with sealing cone when sealing and having suction above cone; Seal cone air pressure above more big, seal cone more good with the gluing, sealing effect of inner conical surface;

Described sealing cone is cone or cone cylinder, and the annular surface of cone or cone cylinder is tapered male cone (strobilus masculinus); Lean on when sealing male cone (strobilus masculinus) and the inner conical surface sealing of cone and press under the gravity of self and seal inner conical surface;

Described field controller is to the interval time producing electromagnetic field for the second time again after control upper magnet and the controller of lower magnet generation electromagnetic field, the time controlling upper magnet and lower magnet generation electromagnetic field and the time length producing electromagnetic field and each generation electromagnetic field;

Described upper magnet and lower magnet are able to produce the solenoid of electromagnetic field;

Described exhaust tube is the hollow pipe of aspirating hole and the vacuum tank connecting negative pressure shell;

Described aspirating hole be air enter the inner chamber of negative pressure shell through air passing hole, in the centre sealing neck, aspirating hole communicates with pumping chamber;

The air extracted in vacuum tank is laid in pumping chamber and is waited to press, and extrudes air at squish intracavity and produces air pressure and discharge outside negative pressure shell; When squish intracavity evacuates gas, pumping chamber communicates with squish chamber; When squish intracavity air-out, pumping chamber is by sealing cone and answering the internal taper hole sealing in magnetic piston and disconnect the passage bled in entrance squish chamber;

Described power brake vacuum pump, in the process evacuating gas, does not have return spring in controlling bleed-off passage and going out the one-way check valve of air duct; When pumping chamber evacuates gas, answer the suction that magnetic piston stroking upward produces to open and seal the passage that cap is bled with the sealing and opening sealing neck, be arranged on the internal taper hole answered in magnetic piston seal cone under the effect of self gravitation automatic decline return and close the passage bled of entrance squish intracavity and seal; When evacuating gas in squish chamber, the cone that seals being arranged on the internal taper hole of air outlet valve utilizes the gravity of self to make sealing bore automatic decline return and closes the passage of the discharge on air outlet valve and seal, and answers magnetic descent of piston and making to produce pressure pumping chamber in and promotes and seal the up passage bled then opening entrance squish intracavity of cone; When squish chamber air-out, promote under the effect of outlet pressure on the internal taper hole of air outlet valve to seal cone up and open the passage given vent to anger of air outlet valve, the cone that seals being arranged on the internal taper hole answered in magnetic piston utilizes the gravity of self to make sealing bore automatic decline return and close and answer the passage bled on magnetic piston to seal;

During use, the power-on circuit of insulated electric conductor and field controller connected by teacher of the opening position key switch, field controller is connected circulation and is connected the power-on circuit generation electromagnetic field of upper magnet and lower magnet, when upper magnet produces electromagnetic field, the captivation of electromagnetic field pulls answers magnetic piston to move up, when answering magnetic piston to start up, it is arranged on sealing on the internal taper hole answered in magnetic piston and bores descending return under the effect of the gravity of self and close air and enter the passage bled in squish chamber; When answering magnetic piston stroking upward, the up of magnetic piston is answered to make the air of squish intracavity create pressure, having the air of pressure to promote from the internal taper hole that the endoporus of the sealed end of air outlet valve lower end enters in air outlet valve, to seal cone up and open the sealing passage of air outlet valve, makes the air of squish intracavity enter after air outlet valve in air; Answer magnetic piston when up, magnetic piston is answered also to make to create in pumping chamber pull of vacuum, pull of vacuum inhale movable sealing cap open and make sealing cap with seal neck annular sealing surface separate, the air in vacuum tank from exhaust tube after air inlet then through sealing cap air passing hole entrance negative pressure shell in answer in the pumping chamber below magnetic piston;

When answering magnetic piston stroking upward to move into place, the power-on circuit of field controller disconnection upper magnet is followed by the power-on circuit of catharsis magnet, and the electromagnetic field of upper magnet disappears, and the electromagnetic field that lower magnet produces pulls answers magnetic descent of piston; When answering magnetic piston to start descending, descending return under the effect sealing cap negative pressure of vacuum under the effect of self gravitation and in vacuum tank sealing on neck being arranged in negative pressure shell lower end and close the bleed-off passage that enters pumping chamber, in air outlet valve seal cone under the effect of the gravity of self descending return and seal the inner conical surface of air outlet valve, cut off the outlet passageway in squish chamber; Answer magnetic piston when descending, air that magnetic piston is forced in pumping chamber is answered to make air produce internal pressure, the air having pressure enter into from the passage answered in magnetic piston answer the internal taper hole in magnetic piston upwards wash open with internal taper hole seal sealing cone displacement after continue up, after the passage in fixing plug enter squish intracavity;

Answer magnetic piston descending when putting in place under the gravitation of the electromagnetic field that lower magnet produces pulls, cone descending the inner conical surface under the effect of the gravity of self that seal being arranged on the inner conical surface answered in magnetic piston is shut and is made air not return pumping chamber, now, field controller is connected again the power-on circuit of Magnet and is again produced electromagnetic field and pull and answer magnetic piston stroking upward; So circulation be switched on and off circuit, make the electromagnetic field that upper magnet produces pull and answer magnetic piston stroking upward and the electromagnetic field that allows lower magnet produce to pull to answer magnetic descent of piston, constantly the air extraction in vacuum tank is entered in air.

2. power brake vacuum pump according to claim 1, it is characterised in that: in order to ensure that protecting crust can be protected the coil of upper magnet and lower magnet without damage and keeps the shape of protecting crust, the interior intracavity manufacture at protecting crust has the skeleton of support.

3. power brake vacuum pump according to claim 1, it is characterized in that: in order to enable to answer magnetic piston to promote the air in the pumping chamber in negative pressure shell to enter squish intracavity, adopt the electromagnetic field that lower magnet produces to answer magnetic piston to move down the power air in pumping chamber being clamp-oned squish chamber as pulling.

4. power brake vacuum pump according to claim 1, it is characterised in that: adopt the teacher position key switch being connected with insulated electric conductor to control being switched on and off of the connection circuit of field controller.

5. power brake vacuum pump according to claim 1, it is characterized in that: the compact conformation of described power brake vacuum pump, vibrate little, utilization rate of electrical is high, powerful, the electric automobile and the internal-combustion engines vehicle that are suitable for vacuum servo formula hydraulic braking are installed and used, and also are able to produce vacuum normally and realize vacuum servo after internal combustion engine shuts down; The market prospect of industrialization is good, commercial value is high, manufactures and uses all very convenient.

6. the manufacture method of a power brake vacuum pump, it is characterised in that: during fabrication, protecting crust creates the hollow cavity of annular, and hollow cavity manufactures to be had string holes, string holes to create to allow the hole of insulated electric conductor traverse; Being provided with in field controller, upper magnet, lower magnet and negative pressure shell and negative pressure shell the parts installed in hollow cavity, the inner of the annular housing of hollow cavity is fixed on negative pressure shell;

In order to convenient for assembly, during fabrication, after protecting crust is divided into two parts manufacture from annular position, recombinant is together for protecting crust;

The inner chamber of negative pressure shell creates the cavity of cylinder, and the periphery of cylindrical cavity creates smooth curved surface; Upper end on the centrage of inner chamber manufactures to have has aspirating hole traverse negative pressure shell through the centre bore of negative pressure shell, lower end manufacture; The middle part of the lower end in negative pressure shell manufactures sealing neck protruding upward, the upper end sealing neck creates annular sealing surface, the inside sealing neck creates aspirating hole, when the inner sealing surface sealing cap does not have with ring packing face seal, aspirating hole is communicated with pumping chamber by air passing hole, and the inner sealing surface sealing cap and the annular sealing surface sealing neck coordinate; Described annular sealing surface creates the sealing surface of the flat smooth of annular; The described cap that seals creates the circular pipe type cap body that top seals, and seals the inner top of cap and divides and create inner sealing surface, and the cylindrical parts manufacture near inner sealing surface has air passing hole;

Air outlet valve creates hollow valve body and seals cone two parts, hollow valve body creates hollow pipe, internal taper hole manufacture is in the middle part of the inner chamber of hollow pipe or middle and lower part, and the internal diameter that the internal diameter that the upper part of the internal taper hole in hollow pipe manufactures is big, lower part manufactures is little; The lower end of hollow valve body manufactures return-air sealed end, the lower surface of return-air sealed end manufactures and creates internal taper hole in the lower end of hollow valve body, upper surface, the big end of internal taper hole communicates with the upper end of air outlet valve, small end communicates with the lower end of air outlet valve, is provided with sealing cone on the inner conical surface of internal taper hole; Inner conical surface can be opened when entering, from the endoporus of hollow valve body lower end, the air having pressure and form passage with sealing the sealing bored;

For the ease of the processing of negative pressure shell be easy to accessory to load in negative pressure shell, described negative pressure shell creates the assembly after segmental machining manufactures; The upper end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration manufacture, the upper part of segmentation place creates pump cover, lower part creates the main body of negative pressure shell, centre bore manufactures on pump cover, aspirating hole manufactures at the middle part of the main body lower end of negative pressure shell, and it is a composite entity that pump cover and the main body after negative pressure shell are combined into after manufacturing; Or, the lower end of the cylindrical cavity body portion in negative pressure shell is divided into two-stage nitration manufacture, the lower part of segmentation place creates pump cover, upper part creates the main body of negative pressure shell, aspirating hole manufactures at the middle part of pump cover, it is a composite entity that centre bore manufacture is combined into after the main body of the middle part of the upper end of the main body of negative pressure shell, pump cover and negative pressure shell manufactures;

Answering magnetic piston to create the iron core of cylinder, the periphery of cylindrical iron core creates smooth periphery, manufactures the annular groove having depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinate with the inner chamber of negative pressure shell can the inner chamber of sealed negative-pressure shell, and can slide at the interior intracavity of negative pressure shell; The cylindrical central portion position of described cylindrical iron core manufactures to be had through hole and holds hole, holding hole and run through the lower surface of iron core, through hole runs through above iron core, holds hole and manufactures below through hole, holding hole to communicate with through hole and pumping chamber, through hole communicates with squish chamber and accommodation hole; Described through hole creates that upper part runs through the upper surface of iron core, lower part runs through the top in the lower sections of accommodation hole of iron core, the lower part of through hole creates passage, the upper part of through hole creates consent, and the mid portion between passage and consent creates internal taper hole; Manufacture in the lower end of cylindrical iron core and have concave up sunken accommodation hole, the described hole that holds creates circular hole that communicate, that upwards cave in passage, when answering magnetic piston to arrive the lower end in negative pressure shell, hold hole and can hold sealing cap and make sealing cap not collide with answering magnetic piston; Having passage holding the manufactured above of hole, the manufactured above of passage has internal taper hole, and the manufactured above of internal taper hole has consent; Described passage creates the via allowing air pass through, and communicates with accommodation hole and consent; Described consent creates to be installed and the fixing hole filled in, and communicates with accommodation hole and squish chamber;

Fixing plug creates centre to be had the plug of passage, described plug to create centre to have the cylinder of through hole or annular ring or card spring coil, it is possible to restriction is arranged on and seals, in the internal taper hole answered in magnetic piston, the distance that cone moves up; When fixing plug creates the cylinder that there is through hole centre, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of fixed cylinder; When fixing plug creates annular ring, the fixing employing interference fit in consent is fixed or adopts jump ring to be stuck in the jump-ring slot in consent the two ends of stationary annular circle; When fixing plug creates card spring coil, directly jump ring is stuck in consent;

Internal taper hole creates tapered circular hole, and the face of circular hole creates inner conical surface; The small end of internal taper hole under, hold upper greatly, manufacture respectively in the hollow valve body of air outlet valve and answer in the through hole of magnetic piston; Inner conical surface can be sealed under sealing the effect of gravity of cone self, pass through suction when sealing and having suction above cone and can open inner conical surface and seal the passage that cone seals; Seal cone air pressure above more big, seal cone more good with the gluing, sealing effect of inner conical surface;

Sealing cone and create cone or cone cylinder, the annular surface of cone or cone cylinder creates tapered male cone (strobilus masculinus); Lean on when sealing male cone (strobilus masculinus) and the inner conical surface sealing of cone and press under the gravity of self and seal inner conical surface;

Field controller creates and controls upper magnet and lower magnet and produce the controller of electromagnetic field, control upper magnet and lower magnet produce time of electromagnetic field and produce the time length of electromagnetic field and produce electromagnetic field every time after to the interval time producing electromagnetic field for the second time again;

Upper magnet and lower magnet create the solenoid that can produce electromagnetic field;

Exhaust tube creates the hollow pipe of aspirating hole and the vacuum tank connecting negative pressure shell;

Aspirating hole create air enter negative pressure shell inner chamber through via, manufacture in the centre sealing neck; Manufacturing in the upper end of the aspirating hole sealed in neck and have annular sealing surface, when being fitted without sealing cap on the annular sealing surface sealing neck, pumping chamber communicates with aspirating hole;

In order to enable to answer magnetic piston to promote the air in the pumping chamber in negative pressure shell to enter squish intracavity, the electromagnetic field that lower magnet produces is adopted to answer magnetic piston to move down the power air in pumping chamber being clamp-oned squish chamber as pulling;

Being provided with upper magnet and lower magnet in protecting crust, upper magnet is fixed on the upper part outside negative pressure shell, and lower magnet is fixed on the lower part outside negative pressure shell, and protecting crust is fixed on the outside protection upper magnet of negative pressure shell and the coil of lower magnet; Below the outside of protecting crust, one side is fixed with foot rest, and the lower end of foot rest protects exhaust tube not oppressed lower than negative pressure shell lower end, and the lower end of foot rest is fixed on the vehicle frame of automobile; Connecting upper magnet and the circuit of lower magnet is connected with the circuit of field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust; Sealing cap is installed in negative pressure shell, answers magnetic piston, seals cone, fixes plug, answer the interior intracavity that magnetic piston is arranged on negative pressure shell to slide up and down; Sealing cone is installed in the internal taper hole below the consent answering in magnetic piston, seal cone can move up and down in internal taper hole, being provided with fixing plug in consent and limit the displacement sealed when cone moves up in internal taper hole, the fixing plug fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopts the two ends that jump ring is stuck in the jump-ring slot in consent fixing plug; The sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone can close, when coordinating with the inner conical surface of internal taper hole and seal, the passage bled answered on magnetic piston, and the sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone and the inner conical surface of internal taper hole can open, when separating, the passage bled answered on magnetic piston; Being cased with sealing cap on the periphery sealing neck of the lower end in negative pressure shell, seal cap and can slide up and down on the periphery sealing neck, when sealing cap is in the accommodation hole answering the lower end of magnetic piston upwards to cave in, sealing cap with holding hole has gap; Seal the inner sealing surface in cap to coordinate with the annular sealing surface sealing neck end and can seal or open the passage bled in entrance negative pressure shell; When answering magnetic piston stroking upward, the lumen portion answering the lower sections of negative pressure shell of magnetic piston is pumping chamber; When answering magnetic descent of piston, the lumen portion answering the negative pressure shell of magnetic piston upper part is squish chamber; Being fixed with exhaust tube at the aspirating hole place of the lower end of negative pressure shell, the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Being provided with air outlet valve in the upper end of negative pressure shell, the lower part of air outlet valve is fixed in the centre bore of the overlying one end of negative pressure shell, and the upper surface of negative pressure shell is exposed in the upper end of air outlet valve.