CN105599745A

CN105599745A - Braking assisting vacuum device

Info

Publication number: CN105599745A
Application number: CN201610082784.6A
Authority: CN
Inventors: 徐昌正
Original assignee: Individual
Current assignee: Individual
Priority date: 2016-02-06
Filing date: 2016-02-06
Publication date: 2016-05-25

Abstract

The invention discloses a braking assisting vacuum device, belonging to the field of automobile hydraulic braking vacuum assistance. The braking assisting vacuum device is characterized in that a solenoid coil is arranged outside a negative pressure shell, a protection shell is fixed onto the negative pressure shell, an air exhaust pipe is fixed to the lower end of the negative pressure shell, an air outlet valve is fixed into a central hole of the negative pressure shell, an iron core spring and a magnetism induced piston are arranged in the negative pressure shell, the iron core spring props against the lower end surface of the magnetism induced piston, a sealing ball or a sealing cone is used for sealing an air exhaust channle of an air exhaust cavity, a sealing plate is used for sealing an air exhaust channle of an air squeezing cavity, a fixed piston is fixed in a piston hole of the magnetism induced piston, and the sealing ball or the sealing cone is arranged in an inner taper hole. The braking assisting vacuum device has the characteristics of compact structure, small vibration, high utilization rate of electrical energy and strong power, can be installed on and used by a vacuum assisted hydraulic braking electric automobile or an internal combustion engine vehicle, can normally generate vacuum and realize vacuum assistance after an internal combustion engine stops running, has a good industrialization market prospect and high commercial value, and is very convenient to manufacture and use.

Description

Brake boost vacuum plant

Technical field

The present invention relates to the brake boost vacuum plant that a kind of vacuum booster for the master cylinder to automobile produces vacuum power.

Background technology

The vavuum pump using on traditional automobile is to adopt the bias formula of laing eggs, and lays eggs to produce when rotated that suction is bled and vacuum.

Summary of the invention

The object that the present invention relates to is in order to provide a kind of electromagnetism pulled straight piston movement to bleed and manufacture and the method thereof of vacuum brake boost vacuum plant.

For achieving the above object, brake boost vacuum plant of the present invention mainly comprises protecting crust, solenoid, negative pressure shell, aspirating hole, ball sealer or sealing cone, sealing plate, restriction cap, iron core spring, answers magnetic piston, fixed plug, internal taper hole, passage, air outlet valve, exhaust tube, field controller, electronic remote controller;

Or described brake boost vacuum plant mainly comprises protecting crust, solenoid, negative pressure shell, aspirating hole, ball sealer or sealing cone, sealing plate, restriction cap, iron core spring, answers magnetic piston, fixed plug, internal taper hole, passage, air outlet valve, exhaust tube, field controller.

Solenoid is installed in protecting crust, and solenoid is fixed on the lower part of negative pressure shell outside, and protecting crust is fixed on the outside protection solenoid of the lower part of negative pressure shell; 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.

The circuit that connects solenoid is connected with 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 receiver of field controller, electronic remote controller and electronic remote controller is arranged in protecting crust; Or the circuit that connects solenoid is connected with field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust.

Restriction cap, ball sealer or sealing cone, iron core spring are installed in negative pressure shell, answer magnetic piston, sealing plate, fixed plug, answer magnetic piston to be arranged on the upper part of the inner chamber of negative pressure shell, iron core spring fitting is at the lower part of the inner chamber of negative pressure shell, lower end, top, upper end that the lower end of iron core spring is pressed in negative pressure shell are pressed in the bottom of answering magnetic piston, answer magnetic piston can slide up and down in the inner chamber of negative pressure shell; In closed hole below the consent of answering in magnetic piston, sealing plate is installed, sealing plate can move up and down in closed hole, displacement when fixed plug is installed in consent limits sealing plate and move up, the fixing employing interference fit of fixed plug in consent fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixing fixed plug in the jump-ring slot in consent; When sealing surface below sealing plate coordinates with the annular sealing surface of closed hole and seals, the passage of bleeding of answering on magnetic piston can be closed, when the sealing surface below sealing plate separates with the annular sealing surface of closed hole, the passage of bleeding of answering on magnetic piston can be opened; Ball sealer or sealing cone are installed in the internal taper hole in the sealing neck of the lower end in negative pressure shell, and restriction cap is fixed on the outside of sealing neck by screw thread or jump ring; Ball sealer or sealing cone with seal internal taper hole in neck and coordinate and can seal or open the passage of bleeding entering in negative pressure shell; While answering magnetic piston stroking upward, answering the inner chamber part of the negative pressure shell of magnetic piston lower part is pumping chamber; While answering magnetic descent of piston, the inner chamber part of answering the negative pressure shell of magnetic piston upper part is squish chamber. Aspirating hole place in the lower end of negative pressure shell is fixed with exhaust tube, and the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Upper end at negative pressure shell is provided with air outlet valve, and the lower part of air outlet valve is fixed in the centre bore of one end above 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 a type or the material of several types in metal, plastics, nylon, fiberglass; The material of hollow valve body and negative pressure shell adopts a type or the material of several types in metal, plastics, nylon and fiberglass; The material of ball sealer or sealing cone and sealing plate adopts a type or the material of several types in metal, plastics, nylon and rubber; The material of answering magnetic piston is the material of the hard to bear magnetic field suction of energy; The material of fixed plug is a type or the material of several types in metal, plastics, nylon, fiberglass, rubber; The material that iron core spring adopts is a type or the material of two types in metal and rubber, adopts when elastomeric material, and iron core spring is the spring of hollow pipe-type, utilizes the elasticity of rubber and shrinkage to realize the function of spring.

Described protecting crust is the hollow cavity of annular, wired hole on hollow cavity, the parts of installing in field controller, solenoid and negative pressure shell and negative pressure shell are installed in hollow cavity, or, the parts of installing in electronic remote controller, field controller, solenoid and negative pressure shell and negative pressure shell are installed in hollow cavity; Line hole is the hole that allows insulated electric conductor pass; 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 convenient to accessory to pack 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 together.

The inner chamber of described negative pressure shell is circular cylindrical cavity, and the face of cylinder of columniform cavity is smooth curved surface; Upper end on the center line of inner chamber has centre bore to pass negative pressure shell, lower end has aspirating hole and internal taper hole stack to wear out the negative pressure shell below upper and lower side and the sealing neck of sealing neck; There is sealing neck protruding upward at the middle part of the lower end in negative pressure shell, and the upper part of the inside of sealing neck is that internal taper hole, lower part are aspirating holes, and when ball sealer or sealing cone are not installed in internal taper hole, internal taper hole communicates with aspirating hole.

Described air outlet valve comprises hollow valve body and ball sealer or sealing cone, and hollow valve body is hollow pipe, and internal taper hole is in middle part or the middle and lower part of the inner chamber of hollow pipe, and the internal diameter of the upper part of the internal taper hole in hollow pipe is large, the internal diameter of lower part is little; There is return-air sealed end the lower end of hollow valve body, the lower surface of return-air sealed end is internal taper hole in lower end, the upper surface of hollow valve body, the large 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, and ball sealer or sealing cone are installed on the inner conical surface of internal taper hole; When enter the air of pressure from the endoporus of hollow valve body lower end, can open the sealing of inner conical surface and ball sealer or sealing cone and form passage.

For the ease of the processing of negative pressure shell be convenient to accessory to pack in negative pressure shell, described negative pressure shell is the assembly after segmentation; The upper end of the circular cylindrical cavity part in negative pressure shell is divided into two sections, the upper part of segmentation place is that pump cover, lower part are the main bodys 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 main body of pump cover and negative pressure shell is combined into a composite entity; Or, the lower end of the circular cylindrical cavity part in negative pressure shell is divided into two sections, the lower part of segmentation place is that pump cover, upper part are the main bodys 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 main body of pump cover and negative pressure shell is combined into a composite entity.

The described magnetic piston of answering is columniform iron core, and the periphery of columniform iron core is smooth periphery, has the annular groove of depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinates inner chamber that can sealed negative-pressure shell with the inner chamber of negative pressure shell, and can in the inner chamber of negative pressure shell, slide. There is through hole in the cylinder centre of described columniform iron core, and through hole communicates with squish chamber and pumping chamber; Upper surface, lower part that the upper part of described through hole runs through iron core run through iron core lower surface, and the lower part of through hole is passage, and the upper part of through hole is consent, and the mid portion between passage and consent is closed hole. On passage, being closed hole, is consent above closed hole; Described passage is the via hole that allows air pass through, and communicates with pumping chamber and consent; Described consent is the hole of installation and fixing fixed plug, communicates with passage and squish chamber.

Described fixed plug be restriction be arranged on distance that the sealing plate in the closed hole of answering in magnetic piston moves up, there is the plug of passage centre, described plug has cylinder or annular ring or the jump ring circle of through hole in the middle of being; When fixed plug has the cylinder of through hole in the middle of being, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixed cylinder in the jump-ring slot in consent; When fixed plug is annular ring, the fixing employing interference fit in consent is fixed or is adopted jump ring to be stuck in the two ends of stationary annular circle in the jump-ring slot in consent; When fixed plug is jump ring circle, directly jump ring is stuck in consent.

Described closed hole is the hole of shallow cylindrical or shallow cone cylindricality, answering the rank that form one-level annular between passage in magnetic piston and consent with the bottom of consent, the hole face in the hole of shallow columniform hole or shallow cone cylindricality is inner headed face or the internal conical surface that holds sealing plate, and the bottom surface of closed hole is porose below annular sealing surface.

Described sealing plate is circular flat board, and dull and stereotyped is simultaneously sealing surface below, and sealing surface coordinates with answering the closed hole on magnetic piston.

Described internal taper hole is the circular hole that has tapering, and the face of circular hole is inner conical surface; The small end of internal taper hole under, hold upper greatly, respectively in the sealing neck of the lower end in the hollow valve body of air outlet valve and in negative pressure shell; Inner conical surface coordinates with the sphere of ball sealer or the male cone (strobilus masculinus) of sealing cone, under the effect of the gravity of ball sealer or sealing cone self, can seal inner conical surface, in the time that ball sealer or sealing cone have suction above, can open inner conical surface by suction and bore with ball sealer or sealing the passage sealing; Ball sealer or sealing cone air pressure are above larger, and ball sealer or sealing cone are better 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 the male cone (strobilus masculinus) that has tapering; The male cone (strobilus masculinus) of sealing cone is bored self during with inner conical surface sealing gravity by sealing presses down and seals inner conical surface.

Described ball sealer is spherosome or oval ball, and the surface of spherosome or oval ball is sealing surface, and sealing surface is smooth sphere; When the sealing of the sphere of ball sealer and inner conical surface, press down by the gravity of ball sealer and seal inner conical surface.

Described restriction cap is calotte, and the crown part of calotte has the air passing hole that allows gas pass through, and the hatband partial fixing of calotte can limit ball sealer or the sealing of on the inner conical surface in sealing neck, installing and bore the distance of moving on sealing neck.

Described field controller is to control the controller that generates an electromagnetic field of solenoid, controlling time and the time length generating an electromagnetic field that electromagnetic field produces and generate an electromagnetic field at every turn after to the interval time generating an electromagnetic field again for the second time.

In order to prevent that robber from stealing automobile easily, making robber there is no vacuum servo in the time driving a car and stopping stealing garage is to adopt installing remote device between teacher position key switch and field controller to connect and cut off the power-on circuit generating an electromagnetic field; Described electronic remote controller is the contactor of connecting and cutting off field controller, comprises the switch sections and the electronic telecontrol part that switch on or off circuit, and electronic telecontrol part comprises remote controller switch and electronic signal receiver; Remote controller switch is carried for staff, is convenient to the normal work of staff's brake activation power-assisted vacuum plant and the control circuit of cut-out brake boost vacuum plant; Described electronic remote controller can have in the present invention, also can not have.

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

Described aspirating hole be the air inner chamber that enters negative pressure shell through air passing hole, at the lower part in centre of sealing neck, above the upper end of the aspirating hole in sealing neck, there is internal taper hole, when ball sealer or sealing cone are not installed in the internal taper hole in sealing neck, internal taper hole communicates with aspirating hole and pumping chamber.

In pumping chamber, lay in and wait to press from the air extracting in vacuum tank, in squish chamber, push air and produce air pressure and discharge outside negative pressure shell; In squish chamber, when exhaust, pumping chamber communicates with squish chamber; Discharge air in squish chamber time, pumping chamber disconnects with answering the internal taper hole sealing in magnetic piston the passage of bleeding that enters squish chamber by ball sealer or sealing cone.

Described brake boost vacuum plant is in the process of exhaust, and controlling bleed-off passage and going out in the one-way check valve of air duct does not have return spring; In the time of pumping chamber exhaust, the suction of answering magnetic piston stroking upward to produce is opened the sealing of the internal taper hole in the sealing neck in ball sealer or sealing cone and negative pressure shell lower end and is opened the passage of bleeding, and is arranged on sealing plate on the closed hole of answering in magnetic piston decline return and close the passage of bleeding entering in squish chamber and seal automatically under the effect of self gravitation; In the time of the exhaust of squish chamber, be arranged on ball sealer on the internal taper hole of air outlet valve or sealing cone and utilize the gravity of self to make ball sealer or the sealing automatic decline return of cone and the passage of closing the discharge on air outlet valve seals, answer magnetic descent of piston and make to produce pressure promotion pumping chamber in and be arranged on the up passage of bleeding entering in squish chamber of then opening of sealing plate on the closed hole of answering in magnetic piston; While discharging air in squish chamber, under the effect that goes out atmospheric pressure, promote ball sealer on the internal taper hole of air outlet valve or sealing cone up and open the passage of giving vent to anger of air outlet valve, be arranged on sealing plate on the closed hole of answering in magnetic piston and utilize the gravity of self to make sealing plate automatically decline return and close the passage of bleeding of answering on magnetic piston and seal.

In order to ensure that brake boost vacuum plant can normally work, adopt connection and the cut-out of the connecting circuit of the teacher position key switch controlling magnetic field controller connecting with insulated electric conductor; Or, connection and the cut-out of the teacher position key switch that employing and insulated electric conductor connect and the connecting circuit of electronic remote controller co-controlling field controller.

Keep the shape of protecting crust in order to ensure protecting crust can protect solenoid not to be damaged, in the inner chamber of protecting crust, manufacture the skeleton that has support.

In order to make the air of answering magnetic piston can promote in the squish chamber in negative pressure shell enter air outlet valve, adopt iron core spring as the power that promotes to answer magnetic piston stroking upward.

When use, teacher of the opening position key switch is directly connected the power-on circuit of insulated electric conductor and field controller, or, teacher of the opening position key is connected the starting button of pressing remote controller switch after the power-on circuit of electronic remote controller, and electronic signal receiver receives the circuit of connecting electronic remote controller and field controller after initiating signal; The power-on circuit that field controller is connected solenoid generates an electromagnetic field, and the attraction that electromagnetic field produces pulls the pressure of answering magnetic piston to overcome iron core spring to move down, and answers magnetic piston up under the promotion of iron core spring; Answer magnetic piston to start when descending, the ball sealer or the sealing cone that are arranged on the internal taper hole in the sealing neck of lower end in negative pressure shell are closed the passage of bleeding that enters pumping chamber under the effect of the gravity of self, ball sealer in air outlet valve or sealing cone descending return and seal the inner conical surface of air outlet valve under the effect of the gravity of self, has cut off the outlet passageway in squish chamber; Answer magnetic piston when descending, answer magnetic piston to promote to enter the air in pumping chamber and make air produce internal pressure, the air that has pressure is up from answering passage in magnetic piston to enter into continue after the closed hole of answering in magnetic piston is upwards washed the sealing of sealing plate and closed hole open and made sealing plate displacement, enters in squish chamber after the passage in fixed plug.

Answer magnetic descent of piston to move to the compression stage of compression iron core spring when spacing, the power-on circuit of field controller cutoff solenoid, magnetic field diminishes, answers magnetic piston up under the promotion of iron core spring; Answer magnetic piston to start when up, be arranged on sealing plate on the closed hole of answering in magnetic the piston descending and passage of bleeding of having closed air and enter squish chamber under the effect of the gravity of self; In the time answering magnetic piston stroking upward, answer the up of magnetic piston and make the air in squish chamber produce pressure, the air that has pressure enters into from the endoporus of the sealed end of air outlet valve lower end that internal taper hole in air outlet valve promotes ball sealer or sealing cone is up and open the seal channel of air outlet valve, and the air in squish chamber is entered in atmosphere after air outlet valve; Answer magnetic piston when up, answer magnetic piston also to make to have produced in pumping chamber pull of vacuum, pull of vacuum is inhaled moving ball sealer or the sealing cone that is arranged on the internal taper hole in sealing neck and is separated with internal taper hole, air in vacuum tank enters into internal taper hole from exhaust tube through aspirating hole, then enters answering in the pumping chamber below magnetic piston in negative pressure shell through the air passing hole on restriction cap.

Answer magnetic piston under the promotion of iron core spring when up putting in place, the ball sealer or the sealing cone that are arranged on the internal taper hole in the sealing neck of lower end in negative pressure shell are closed the passage of bleeding that enters pumping chamber under the effect of the gravity of self, ball sealer in air outlet valve or sealing cone descending return and seal the inner conical surface of air outlet valve under the effect of the gravity of self, has cut off the outlet passageway in squish chamber and makes air not return to pumping chamber; Now, the power-on circuit that field controller is connected again solenoid again generates an electromagnetic field and makes to answer magnetic descent of piston; So connection of circulation and cut off circuit, generates an electromagnetic field solenoid to pull to answer magnetic piston stroking upward and allow iron core spring promote to answer magnetic descent of piston, constantly the air in vacuum tank is extracted out and is entered in atmosphere.

A manufacture method for brake boost vacuum plant, is characterized in that:

During fabrication, protecting crust adopts a type or the material manufacture of several types in metal, plastics, nylon, fiberglass; Hollow valve body and negative pressure shell adopt a type or the material manufacture of several types in metal, plastics, nylon and fiberglass; Ball sealer or sealing cone and sealing plate adopt a type or the material manufacture of several types in metal, plastics, nylon and rubber; Answer magnetic piston to adopt the material manufacture of the hard to bear magnetic field suction of energy; Fixed plug adopts a type or the material manufacture of several types in metal, plastics, nylon, fiberglass, rubber; Iron core spring adopts a type or the material manufacture of two types in metal and rubber, and while adopting elastomeric material to manufacture, iron core spring creates hollow tubular type spring, utilizes the elasticity of rubber and shrinkage to realize the function of spring.

Protecting crust creates the hollow cavity of annular, manufactures wired hole on hollow cavity, and line hole creates the hole that allows insulated electric conductor pass; The parts of installing in field controller, solenoid and negative pressure shell and negative pressure shell are installed in hollow cavity, or, the parts of installing in electronic remote controller, field controller, solenoid and negative pressure shell and negative pressure shell are installed in hollow cavity; The inner of the annular housing of hollow cavity is fixed on negative pressure shell.

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

The inner chamber of negative pressure shell creates columniform cavity, and the periphery of columniform cavity creates smooth curved surface; The centre bore, the lower end manufacture that have through negative pressure shell are manufactured in upper end on the center line of inner chamber aspirating hole and internal taper hole, and the negative pressure shell below upper and lower side and the sealing neck that seals neck is worn out in aspirating hole and internal taper hole stack; Manufacture at the middle part of the lower end in negative pressure shell sealing neck protruding upward, and the upper part of the inside of sealing neck creates internal taper hole, lower part creates aspirating hole, and internal taper hole communicates with aspirating hole, and internal taper hole coordinates with ball sealer or sealing cone.

Air outlet valve creates hollow valve body and ball sealer or sealing cone two parts, hollow valve body creates hollow pipe, internal taper hole is manufactured on middle part or the middle and lower part of the inner chamber of hollow pipe, and the internal diameter internal diameter large, that lower part is manufactured that the upper part of the internal taper hole in hollow pipe is manufactured is little; Manufacture the lower end of hollow valve body return-air sealed end, lower end, upper surface that the lower surface of return-air sealed end is manufactured on hollow valve body create internal taper hole, the large 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, and ball sealer or sealing cone are installed on the inner conical surface of internal taper hole; When enter the air of pressure from the endoporus of hollow valve body lower end, can open the sealing of inner conical surface and ball sealer or sealing cone and form passage.

For the ease of the processing of negative pressure shell be convenient to accessory to pack in negative pressure shell, described negative pressure shell creates the assembly after segmental machining is manufactured; The upper end of the circular cylindrical cavity part in negative pressure shell is divided into two sections of manufactures, the upper part of segmentation place creates pump cover, lower part and creates the main body of negative pressure shell, centre bore is manufactured on pump cover, aspirating hole is manufactured on the middle part of the main body lower end of negative pressure shell, and it is a composite entity that the main body after pump cover and negative pressure shell is combined into after manufacturing; Or, the lower end of the circular cylindrical cavity part in negative pressure shell is divided into two sections of manufactures, the lower part of segmentation place creates pump cover, upper part and creates the main body of negative pressure shell, aspirating hole is manufactured on the middle part of pump cover, centre bore is manufactured on the middle part of the upper end of the main body of negative pressure shell, and it is a composite entity that the main body of pump cover and negative pressure shell is combined into after manufacturing.

Answer magnetic piston to create columniform iron core, the periphery of columniform iron core creates smooth periphery, manufactures the annular groove that has depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinates inner chamber that can sealed negative-pressure shell with the inner chamber of negative pressure shell, and can in the inner chamber of negative pressure shell, slide. Manufacture in the cylinder centre of described columniform iron core through hole, and through hole communicates with squish chamber and pumping chamber; Described through hole creates upper surface, the lower part that upper part runs through iron core and runs through iron core lower surface, 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 closed hole. On passage, manufacture and have closed hole, the manufacture above of closed hole has consent; Described passage creates the via hole that allows air pass through, and communicates with pumping chamber and consent; Described consent creates the hole of installation and fixing fixed plug, communicates with passage and squish chamber.

Fixed plug has the plug of passage in the middle of creating, and has cylinder or annular ring or the jump ring circle of through hole in the middle of described plug creates, and can limit the distance that the sealing plate that is arranged in the closed hole of answering in magnetic piston moves up; While having the cylinder of through hole in the middle of fixed plug creates, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixed cylinder in the jump-ring slot in consent; When fixed plug creates annular ring, the fixing employing interference fit in consent is fixed or is adopted jump ring to be stuck in the two ends of stationary annular circle in the jump-ring slot in consent; When fixed plug creates jump ring circle, directly jump ring is stuck in consent.

Described closed hole creates the hole of shallow cylindrical or shallow cone cylindricality, be manufactured on the rank that form one-level annular between the passage of answering in magnetic piston and consent with the bottom of consent, the hole face in the hole of shallow columniform hole or shallow cone cylindricality creates the inner headed face or the internal conical surface that hold sealing plate, and the bottom surface of closed hole creates porose annular sealing surface below.

Sealing plate creates circular flat board, dull and stereotyped simultaneously creates sealing surface below, and sealing surface coordinates with answering the closed hole on magnetic piston.

Described internal taper hole creates the circular hole of tapering, and the face of circular hole creates inner conical surface; The small end of internal taper hole under, hold upper greatly, be manufactured on respectively in the hollow valve body of air outlet valve and be manufactured in the sealing neck of the lower end in negative pressure shell; Under the effect of the gravity of ball sealer or sealing cone self, can seal inner conical surface, in the time that ball sealer or sealing cone have suction above, can open inner conical surface by suction and bore with ball sealer or sealing the passage sealing; Ball sealer or sealing cone air pressure are above larger, and ball sealer or sealing cone are better with the gluing, sealing effect of inner conical surface.

Sealing cone creates cone or cone cylinder, and the annular surface of cone or cone cylinder creates the male cone (strobilus masculinus) of tapering; The male cone (strobilus masculinus) of sealing cone is bored self during with inner conical surface sealing gravity by sealing presses down and seals inner conical surface.

Ball sealer creates spherosome or oval ball, and the surface of spherosome or oval ball creates sealing surface, and sealing surface creates smooth sphere; When the sealing of the sphere of ball sealer and inner conical surface, press down by the self gravitation of ball sealer and seal inner conical surface.

Restriction cap creates calotte, and the crown of calotte is partly manufactured and had the air passing hole that allows gas pass through, and the hatband partial fixing of calotte can limit ball sealer or the sealing of on the inner conical surface in sealing neck, installing and bore the distance of moving on sealing neck.

Field controller creates controls the controller that generates an electromagnetic field of solenoid, controlling the time that electromagnetic field produces and generate an electromagnetic field the length of time and generate an electromagnetic field at every turn after to the interval time generating an electromagnetic field again for the second time.

In order to prevent that robber from stealing automobile easily, making robber there is no vacuum servo in the time driving a car and stopping stealing garage is to adopt installing remote device between teacher position key switch and field controller to connect and cut off the power-on circuit generating an electromagnetic field; Described electronic remote controller creates the contactor of connecting and cutting off field controller, comprises the switch sections and the electronic telecontrol part that switch on or off circuit, and electronic telecontrol part comprises remote controller switch and electronic signal receiver; Described electronic remote controller can have in the present invention, also can not have.

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

Aspirating hole create air enter negative pressure shell inner chamber through via hole, be manufactured on the lower part in the centre of sealing neck, above the upper end of the aspirating hole in sealing neck, manufacture and have internal taper hole, when ball sealer or sealing cone are not installed in the internal taper hole in sealing neck, internal taper hole communicates with aspirating hole and pumping chamber.

Solenoid is installed in protecting crust, and solenoid is fixed on the lower part of negative pressure shell outside, and protecting crust is fixed on the outside protection solenoid of the lower part of negative pressure shell; 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. The circuit that connects solenoid is connected with 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 receiver of field controller, electronic remote controller and electronic remote controller is arranged in protecting crust; Or the circuit that connects solenoid is connected with field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust. Restriction cap, ball sealer or sealing cone, iron core spring are installed in negative pressure shell, answer magnetic piston, sealing plate, fixed plug, answer magnetic piston to be arranged on the upper part of the inner chamber of negative pressure shell, iron core spring fitting is at the lower part of the inner chamber of negative pressure shell, lower end, top, upper end that the lower end of iron core spring is pressed in negative pressure shell are pressed in the bottom of answering magnetic piston, answer magnetic piston can slide up and down in the inner chamber of negative pressure shell; In closed hole below the consent of answering in magnetic piston, sealing plate is installed, sealing plate can move up and down in closed hole, displacement when fixed plug is installed in consent limits sealing plate and move up, the fixing employing interference fit of fixed plug in consent fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixing fixed plug in the jump-ring slot in consent; When sealing surface below sealing plate coordinates with the annular sealing surface of closed hole and seals, the passage of bleeding of answering on magnetic piston can be closed, when the sealing surface below sealing plate separates with the annular sealing surface of closed hole, the passage of bleeding of answering on magnetic piston can be opened; Ball sealer or sealing cone are installed in the internal taper hole in the sealing neck of the lower end in negative pressure shell, and restriction cap is fixed on the outside of sealing neck by screw thread or jump ring; Ball sealer or sealing cone with seal internal taper hole in neck and coordinate and can seal or open the passage of bleeding entering in negative pressure shell; While answering magnetic piston stroking upward, answering the inner chamber part of the negative pressure shell of magnetic piston lower part is pumping chamber; While answering magnetic descent of piston, the inner chamber part of answering the negative pressure shell of magnetic piston upper part is squish chamber. Aspirating hole place in the lower end of negative pressure shell is fixed with exhaust tube, and the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Upper end at negative pressure shell is provided with air outlet valve, and the lower part of air outlet valve is fixed in the centre bore of one end above 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 brake boost vacuum plant of the present invention, vibrate little, utilization rate of electrical is high, powerful, the electric automobile and the internal-combustion engines vehicle that are applicable to the hydraulic braking of vacuum servo formula are installed and used, and also can produce normally vacuum and realize vacuum servo after engine stops; The market prospects of industrialization are good, commercial value is high, manufacture and use all very convenient.

Brief description of the drawings

Fig. 1 and Fig. 2 are the structural representations of brake boost vacuum plant;

Fig. 3 is the structural representation of answering magnetic piston;

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

Shown in figure: protecting crust 1, foot rest 2, exhaust tube 3, negative pressure shell 4, hollow valve body 5, iron core spring 6, answer magnetic piston 7, ball sealer 8 or sealing cone 8, fixed plug 10, restriction cap 11, air passing hole 12, solenoid 13, sealing plate 14, passage 16, closed hole 17, consent 18, annular sealing surface 19.

Detailed description of the invention

Brake boost vacuum plant of the present invention mainly comprises protecting crust 1, solenoid 13, negative pressure shell 4, aspirating hole, ball sealer 8 or sealing cone 8, sealing plate 14, restriction cap 11, iron core spring 6, answers magnetic piston 7, fixed plug 10, internal taper hole, passage 16, air outlet valve, exhaust tube 3, field controller, electronic remote controller; Or comprise protecting crust 1, solenoid 13, negative pressure shell 4, aspirating hole, ball sealer 8 or sealing cone 8, sealing plate 14, restriction cap 11, iron core spring 6, answer magnetic piston 7, fixed plug 10, internal taper hole, passage 16, air outlet valve, exhaust tube 3, field controller.

Solenoid 13 is installed in protecting crust 1, and solenoid 13 is fixed on the lower part of negative pressure shell 4 outsides, and protecting crust 1 is fixed on the outside protection solenoid 13 of the lower part of negative pressure shell 4; 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 ends, and the lower end of foot rest 2 is fixed on the vehicle frame of automobile.

The circuit that connects solenoid 13 is connected with 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 receiver of field controller, electronic remote controller and electronic remote controller is arranged in protecting crust 1; Or the circuit that connects solenoid 13 is connected with field controller, the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust 1.

Restriction cap 11, ball sealer 8 or sealing cone 8, iron core spring 6 are installed in negative pressure shell 4, answer magnetic piston 7, sealing plate 14, fixed plug 10, answer magnetic piston 7 to be arranged on the upper part of the inner chamber of negative pressure shell 4, iron core spring 6 is arranged on the lower part of the inner chamber of negative pressure shell 4, lower end, top, upper end that the lower end of iron core spring 6 is pressed in negative pressure shell 4 are pressed in the bottom of answering magnetic piston 7, answer magnetic piston 7 can slide up and down in the inner chamber of negative pressure shell 4; In closed hole 17 below the consent 18 of answering in magnetic piston 7, sealing plate 14 is installed, sealing plate 14 can move up and down in closed hole 17, displacement when fixed plug 10 is installed in consent 18 limits sealing plate 14 and move up, the fixing employing interference fit of fixed plug 10 in consent 18 fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixing fixed plug 10 in the jump-ring slot in consent 18; Sealing plate 14 sealing surface below coordinates with the annular sealing surface 19 of closed hole 17 and can close the passage of bleeding of answering on magnetic piston 7 while sealing, when the sealing surface below sealing plate 14 separates with the annular sealing surface 19 of closed hole 17, can open the passage of bleeding of answering on magnetic piston 7; Ball sealer 8 or sealing cone 8 are installed in the internal taper hole in the sealing neck of the lower end in negative pressure shell 4, and restriction cap 11 is fixed on the outside of sealing neck by screw thread or jump ring; Ball sealer 8 or sealing cone 8 with seal internal taper hole in neck and coordinate and can seal or open the passage of bleeding entering in negative pressure shell 4; While answering magnetic piston 7 up, answering the inner chamber part of the negative pressure shell 4 of magnetic piston 7 lower parts is pumping chambers; While answering magnetic piston 7 descending, the inner chamber part of answering the negative pressure shell 4 of magnetic piston 7 upper parts is squish chambeies. Aspirating hole place in the lower end of negative pressure shell 4 is fixed with exhaust tube 3, and 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; Upper end at negative pressure shell 4 is provided with air outlet valve, and the lower part of air outlet valve is fixed in the centre bore of one end above 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 a type or the material manufacture of several types in metal, plastics, nylon, fiberglass, rubber, when protecting crust 1 while adopting elastomeric material to manufacture or after manufacture shaping is soft-shell, make it float on gas face will first in use the inner chamber inflation of protecting crust 1; Hollow valve body 5 and negative pressure shell 4 adopt a type or the material manufacture of several types in metal, plastics, nylon and fiberglass; Ball sealer 8 or sealing cone 8 and sealing plate 14 adopt a type or the material manufacture of several types in metal, plastics, nylon and rubber; Answer magnetic piston 7 to adopt the material manufacture of the hard to bear magnetic field suction of energy; Fixed plug 10 adopts a type or the material manufacture of several types in metal, plastics, nylon, fiberglass, rubber; Iron core spring 6 adopts a type or the material manufacture of two types in metal and rubber, and while adopting elastomeric material to manufacture, iron core spring 6 creates hollow tubular type spring, utilizes the elasticity of rubber and shrinkage to realize the function of spring.

Protecting crust 1 creates the hollow cavity of annular, manufactures wired hole on hollow cavity, and line hole creates the hole that allows insulated electric conductor pass; The parts of field controller, solenoid 13 and negative pressure shell 4 and negative pressure shell 4 interior installations are installed in hollow cavity, or, the parts of electronic remote controller, field controller, solenoid 13 and negative pressure shell 4 and negative pressure shell 4 interior installations are installed in hollow cavity; The inner of the annular housing of hollow cavity is fixed on negative pressure shell 4.

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

The inner chamber of negative pressure shell 4 creates columniform cavity, and the periphery of columniform cavity creates smooth curved surface; The centre bore, the lower end manufacture that have through negative pressure shell 4 are manufactured in upper end on the center line of inner chamber aspirating hole and internal taper hole, and the negative pressure shell 4 below upper and lower side and the sealing neck that seals neck is worn out in aspirating hole and internal taper hole stack; Manufacture at the middle part of the lower end in negative pressure shell 4 sealing neck protruding upward, and the upper part of the inside of sealing neck creates internal taper hole, lower part creates aspirating hole, and internal taper hole communicates with aspirating hole, and internal taper hole coordinates with ball sealer 8 or sealing cone 8.

Air outlet valve creates hollow valve body 5 and ball sealer 8 or sealing cone 8 two parts, hollow valve body 5 creates hollow pipe, internal taper hole is manufactured on middle part or the middle and lower part of the inner chamber of hollow pipe, and the internal diameter internal diameter large, that lower part is manufactured that the upper part of the internal taper hole in hollow pipe is manufactured is little; Manufacture the lower end of hollow valve body 5 return-air sealed end, lower end, upper surface that the lower surface of return-air sealed end is manufactured on hollow valve body 5 create internal taper hole, the large 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, and ball sealer 8 or sealing cone 8 are installed on the inner conical surface of internal taper hole; When enter the air of pressure from the endoporus of hollow valve body 5 lower ends, can open the sealing of inner conical surface and ball sealer 8 or sealing cone 8 and form passage.

For the ease of the processing of negative pressure shell 4 be convenient to accessory to pack in negative pressure shell 4, described negative pressure shell 4 creates the assembly after segmental machining is manufactured; The upper end of the circular cylindrical cavity part in negative pressure shell 4 is divided into two sections of manufactures, the upper part of segmentation place creates pump cover, lower part and creates the main body of negative pressure shell 4, centre bore is manufactured on pump cover, aspirating hole is manufactured on the middle part of the main body lower end of negative pressure shell 4, and it is a composite entity that the main body after pump cover and negative pressure shell 4 is combined into after manufacturing; Or, the lower end of the circular cylindrical cavity part in negative pressure shell 4 is divided into two sections of manufactures, the lower part of segmentation place creates pump cover, upper part and creates the main body of negative pressure shell 4, aspirating hole is manufactured on the middle part of pump cover, centre bore is manufactured on the middle part of the upper end of the main body of negative pressure shell 4, and it is a composite entity that the main body of pump cover and negative pressure shell 4 is combined into after manufacturing.

Answer magnetic piston 7 to create columniform iron core, the periphery of columniform iron core creates smooth periphery, manufactures the annular groove that has depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinates inner chamber that can sealed negative-pressure shell 4 with the inner chamber of negative pressure shell 4, and can in the inner chamber of negative pressure shell 4, slide. Manufacture in the cylinder centre of described columniform iron core through hole, and through hole communicates with squish chamber and pumping chamber; Described through hole creates upper surface, the lower part that upper part runs through iron core and runs through iron core lower surface, 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 closed hole 17. On passage 16, manufacture and have closed hole 17, the manufacture above of closed hole 17 has consent 18; Described passage 16 creates the via hole that allows air pass through, and communicates with pumping chamber and consent 18; Described consent 18 creates the hole of installation and fixing fixed plug 10, communicates with passage 16 and squish chamber.

Fixed plug 10 has the plug of passage 16 in the middle of creating, and has cylinder or annular ring or the jump ring circle of through hole in the middle of described plug creates, and can limit the distance that the sealing plate 14 that is arranged in the closed hole 17 of answering in magnetic piston 7 moves up; While having the cylinder of through hole in the middle of fixed plug 10 creates, the fixing employing interference fit in consent 18 is fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixed cylinder in the jump-ring slot in consent 18; When fixed plug 10 creates annular ring, the fixing employing interference fit in consent 18 is fixed or is adopted jump ring to be stuck in the two ends of stationary annular circle in the jump-ring slot in consent 18; When fixed plug 10 creates jump ring circle, directly jump ring is stuck in consent 18.

Described closed hole 17 creates the hole of shallow cylindrical or shallow cone cylindricality, be manufactured on the rank that form one-level annular between the passage 16 of answering in magnetic piston 7 and consent 18 with the bottom of consent 18, the hole face in the hole of shallow columniform hole or shallow cone cylindricality creates the inner headed face or the internal conical surface that hold sealing plate 14, and the bottom surface of closed hole 17 creates porose annular sealing surface 19 below.

Sealing plate 14 creates circular flat board, dull and stereotyped simultaneously creates sealing surface below, and sealing surface coordinates with answering the closed hole 17 on magnetic piston 7.

Described internal taper hole creates the circular hole of tapering, and the face of circular hole creates inner conical surface; The small end of internal taper hole under, hold upper greatly, be manufactured on respectively in the hollow valve body 5 of air outlet valve and be manufactured in the sealing neck of the lower end in negative pressure shell 4; Under the effect of the gravity of ball sealer 8 or sealing cone 8 self, can seal inner conical surface, in the time that ball sealer 8 or sealing cone 8 have suction above, can open inner conical surface by suction and bore 8 passages that seal with ball sealer 8 or sealing; Ball sealer 8 or sealing cone 8 air pressure are above larger, and ball sealer 8 or sealing cone 8 are better with the gluing, sealing effect of inner conical surface.

Sealing cone 8 creates cone or cone cylinder, and the annular surface of cone or cone cylinder creates the male cone (strobilus masculinus) of tapering; The male cone (strobilus masculinus) of sealing cone 8 is bored 8 self gravity and is pressed down and seal inner conical surface by sealing during with inner conical surface sealing.

Ball sealer 8 creates spherosome or oval ball, and the surface of spherosome or oval ball creates sealing surface, and sealing surface creates smooth sphere; When the sealing of the sphere of ball sealer 8 and inner conical surface, press down by the self gravitation of ball sealer 8 and seal inner conical surface.

Restriction cap 11 creates calotte, and the crown of calotte is partly manufactured and had the air passing hole 12 that allows gas pass through, and the hatband partial fixing of calotte can limit ball sealer 8 or the sealing of on the inner conical surface in sealing neck, installing and bore the distance of moving on 8 on sealing neck.

Field controller creates controls the controller that generates an electromagnetic field of solenoid 13, controlling the time that electromagnetic field produces and generate an electromagnetic field the length of time and generate an electromagnetic field at every turn after to the interval time generating an electromagnetic field again for the second time.

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

Aspirating hole create air enter negative pressure shell 4 inner chamber through via hole, be manufactured on the lower part in the centre of sealing neck, above the upper end of the aspirating hole in sealing neck, manufacture and have internal taper hole, ball sealer 8 or sealing cone are not installed in the internal taper hole in sealing neck at 8 o'clock, internal taper hole communicates with aspirating hole and pumping chamber.

Keep the shape of protecting crust 1 in order to ensure protecting crust 1 can protect solenoid 13 not to be damaged, in the inner chamber of protecting crust 1, manufacture the skeleton that has support.

In order to make the air of answering magnetic piston 7 can promote in the squish chamber in negative pressure shell 4 enter air outlet valve, adopt iron core spring 6 as promoting to answer the up power of magnetic piston 7.

In pumping chamber, lay in and wait to press from the air extracting in vacuum tank, in squish chamber, push air and produce air pressure and discharge outside negative pressure shell; In squish chamber, when exhaust, pumping chamber communicates with squish chamber; Discharge air in squish chamber time, pumping chamber disconnects with answering the internal taper hole sealing in magnetic piston 7 passage of bleeding that enters squish chamber by ball sealer 8 or sealing cone 8.

Described brake boost vacuum plant is in the process of exhaust, and controlling bleed-off passage and going out in the one-way check valve of air duct does not have return spring; In the time of pumping chamber exhaust, answer the suction of magnetic piston 7 up generations open the sealing of the internal taper hole in the sealing neck in ball sealer 8 or sealing cone 8 and negative pressure shell 4 lower ends and open the passage of bleeding, be arranged on sealing plate 14 on the closed hole 17 of answering in magnetic piston 7 decline return and close the passage of bleeding entering in squish chamber and seal automatically under the effect of self gravitation; In the time of the exhaust of squish chamber, be arranged on ball sealer 8 on the internal taper hole of air outlet valve or sealing cone 8 and utilize the gravity of self to make ball sealer 8 or sealing cone 8 automatic decline returns and the passage of closing the discharge on air outlet valve seals, answer magnetic piston 7 descending and make generation pressure promotion pumping chamber in be arranged on the up passage of bleeding entering in squish chamber of then opening of sealing plate 14 on the closed hole 17 of answering in magnetic piston 7; While discharging air in squish chamber, under the effect that goes out atmospheric pressure, promote ball sealer 8 on the internal taper hole of air outlet valve or sealing cone 8 up and open the passage of giving vent to anger of air outlet valve, be arranged on sealing plate 14 on the closed hole 17 of answering in magnetic piston 7 and utilize the gravity of self to make the automatic decline return of sealing plate 14 and close the passage of bleeding of answering on magnetic piston 7 and seal.

When use, teacher of the opening position key switch is directly connected the power-on circuit of insulated electric conductor and field controller, or, teacher of the opening position key is connected the starting button of pressing remote controller switch after the power-on circuit of electronic remote controller, and electronic signal receiver receives the circuit of connecting electronic remote controller and field controller after initiating signal; The power-on circuit that field controller is connected solenoid 13 generates an electromagnetic field, the attraction that electromagnetic field produces pulls the pressure of answering magnetic piston 7 to overcome iron core spring 6 to move down, answer magnetic piston 7 to start when descending, be arranged under the effect of ball sealer 8 on the internal taper hole in the sealing neck of negative pressure shell 4 interior lower ends or sealing cone 8 gravity at self and close the passage of bleeding that enters pumping chamber, descending return under the effect of the ball sealer 8 in air outlet valve or sealing cone 8 gravity at self and seal the inner conical surface of air outlet valve, has cut off the outlet passageway in squish chamber; Answer magnetic piston 7 when descending, answer magnetic piston 7 to promote to enter the air in pumping chamber and make air produce internal pressure, the air that has pressure is up from answering passage 16 in magnetic piston 7 to enter into continue after the closed hole 17 of answering in magnetic piston 7 is upwards washed the sealing of sealing plate 14 and closed hole 17 open and made sealing plate 14 displacements, after the passage 16 in fixed plug 10, enters in squish chamber.

While answering the descending compression stage that moves to compression iron core spring 6 of magnetic piston 7 spacing, the power-on circuit of field controller cutoff solenoid 13, magnetic field diminishes, answers magnetic piston 7 up under the promotion of iron core spring 6; Answer magnetic piston 7 to start when up, be arranged on sealing plate 14 on the closed hole 17 of answering in magnetic the piston 7 descending and passage of bleeding of having closed air and enter squish chamber under the effect of the gravity of self; In the time answering magnetic piston 7 up, answer the up of magnetic piston 7 and make the air in squish chamber produce pressure, the air that has pressure enters into from the endoporus of the sealed end of air outlet valve lower end that internal taper hole in air outlet valve promotes ball sealer 8 or sealing cone 8 is up and open the seal channel of air outlet valve, and the air in squish chamber is entered in atmosphere after air outlet valve; Answer magnetic piston 7 when up, answer magnetic piston 7 also to make to have produced in pumping chamber pull of vacuum, pull of vacuum is inhaled moving ball sealer 8 or the sealing cone 8 that is arranged on the internal taper hole in sealing neck and is separated with internal taper hole, air in vacuum tank enters into internal taper hole from exhaust tube 3 through aspirating hole, then enters answering in magnetic piston 7 pumping chamber below in negative pressure shell 4 through the air passing hole 12 on restriction cap 11.

Answer magnetic piston 7 under the promotion of iron core spring 6 when up putting in place, be arranged under the effect of ball sealer 8 on the internal taper hole in the sealing neck of negative pressure shell 4 interior lower ends or sealing cone 8 gravity at self and close the passage of bleeding that enters pumping chamber, descending return under the effect of the ball sealer 8 in air outlet valve or sealing cone 8 gravity at self and seal the inner conical surface of air outlet valve, has cut off the outlet passageway in squish chamber and makes air not return to pumping chamber; Now, the power-on circuit that field controller is connected again solenoid 13 again generates an electromagnetic field and makes to answer magnetic piston 7 descending; So connection of circulation and cut off circuit, generates an electromagnetic field solenoid 13 to pull to answer magnetic piston 7 up and allow iron core spring 6 promote to answer magnetic piston 7 descending, constantly the air in vacuum tank is extracted out and is entered in atmosphere.

Claims

1. a brake boost vacuum plant, is characterized in that: described brake boost vacuum plant comprises protecting crust, solenoid, negative pressure shell, aspirating hole, sealing cone, sealing plate, restriction cap, iron core spring, answers magnetic piston, fixed plug, internal taper hole, passage, air outlet valve, exhaust tube, field controller;

Solenoid is installed in protecting crust, and solenoid is fixed on the lower part of negative pressure shell outside, and protecting crust is fixed on the outside protection solenoid of the lower part of negative pressure shell; 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;

The circuit that connects solenoid is connected with field controller, and the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust;

Restriction cap, sealing cone, iron core spring are installed in negative pressure shell, answer magnetic piston, sealing plate, fixed plug, answer magnetic piston to be arranged on the upper part of the inner chamber of negative pressure shell, iron core spring fitting is at the lower part of the inner chamber of negative pressure shell, lower end, top, upper end that the lower end of iron core spring is pressed in negative pressure shell are pressed in the bottom of answering magnetic piston, answer magnetic piston can slide up and down in the inner chamber of negative pressure shell; In closed hole below the consent of answering in magnetic piston, sealing plate is installed, sealing plate can move up and down in closed hole, displacement when fixed plug is installed in consent limits sealing plate and move up, the fixing employing interference fit of fixed plug in consent fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixing fixed plug in the jump-ring slot in consent; When sealing surface below sealing plate coordinates with the annular sealing surface of closed hole and seals, the passage of bleeding of answering on magnetic piston can be closed, when the sealing surface below sealing plate separates with the annular sealing surface of closed hole, the passage of bleeding of answering on magnetic piston can be opened; Sealing cone is installed in the internal taper hole in the sealing neck of the lower end in negative pressure shell, and restriction cap is fixed on the outside of sealing neck by screw thread or jump ring; Sealing cone with seal internal taper hole in neck and coordinate and can seal or open the passage of bleeding entering in negative pressure shell; While answering magnetic piston stroking upward, answering the inner chamber part of the negative pressure shell of magnetic piston lower part is pumping chamber; While answering magnetic descent of piston, the inner chamber part of answering the negative pressure shell of magnetic piston upper part is squish chamber; Aspirating hole place in the lower end of negative pressure shell is fixed with exhaust tube, and the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Upper end at negative pressure shell is provided with air outlet valve, and the lower part of air outlet valve is fixed in the centre bore of one end above 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 wired hole on hollow cavity is provided with the parts of installing in field controller, solenoid and negative pressure shell and negative pressure shell in hollow cavity, and line hole is the hole that allows insulated electric conductor pass; 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 convenient to accessory to pack 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 together;

The inner chamber of described negative pressure shell is circular cylindrical cavity, and the face of cylinder of columniform cavity is smooth curved surface; Upper end on the center line of inner chamber has centre bore to pass negative pressure shell, lower end has aspirating hole and internal taper hole stack to wear out the negative pressure shell below upper and lower side and the sealing neck of sealing neck; There is sealing neck protruding upward at the middle part of the lower end in negative pressure shell, and the upper part of the inside of sealing neck is that internal taper hole, lower part are aspirating holes, and when sealing cone is not installed in internal taper hole, internal taper hole communicates with aspirating hole;

Described air outlet valve comprises hollow valve body and sealing cone, and hollow valve body is hollow pipe, and internal taper hole is in middle part or the middle and lower part of the inner chamber of hollow pipe, and the internal diameter of the upper part of the internal taper hole in hollow pipe is large, the internal diameter of lower part is little; There is return-air sealed end the lower end of hollow valve body, the lower surface of return-air sealed end is internal taper hole in lower end, the upper surface of hollow valve body, the large 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, and sealing cone is installed on the inner conical surface of internal taper hole; When enter the air of pressure from the endoporus of hollow valve body lower end, can open inner conical surface and form passage with the sealing of sealing cone;

For the ease of the processing of negative pressure shell be convenient to accessory to pack in negative pressure shell, described negative pressure shell is the assembly after segmentation; The upper end of the circular cylindrical cavity part in negative pressure shell is divided into two sections, the upper part of segmentation place is that pump cover, lower part are the main bodys 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 main body of pump cover and negative pressure shell is combined into a composite entity; Or, the lower end of the circular cylindrical cavity part in negative pressure shell is divided into two sections, the lower part of segmentation place is that pump cover, upper part are the main bodys 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 main body of pump cover and negative pressure shell is combined into a composite entity;

The described magnetic piston of answering is columniform iron core, and the periphery of columniform iron core is smooth periphery, has the annular groove of depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinates inner chamber that can sealed negative-pressure shell with the inner chamber of negative pressure shell, and can in the inner chamber of negative pressure shell, slide; There is through hole in the cylinder centre of described columniform iron core, and through hole communicates with squish chamber and pumping chamber; Upper surface, lower part that the upper part of described through hole runs through iron core run through iron core lower surface, and the lower part of through hole is passage, and the upper part of through hole is consent, and the mid portion between passage and consent is closed hole; On passage, being closed hole, is consent above closed hole; Described passage is the via hole that allows air pass through, and communicates with pumping chamber and consent; Described consent is the hole of installation and fixing fixed plug, communicates with passage and squish chamber;

Described fixed plug be restriction be arranged on distance that the sealing plate in the closed hole of answering in magnetic piston moves up, there is the plug of passage centre, described plug has cylinder or annular ring or the jump ring circle of through hole in the middle of being; When fixed plug has the cylinder of through hole in the middle of being, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixed cylinder in the jump-ring slot in consent; When fixed plug is annular ring, the fixing employing interference fit in consent is fixed or is adopted jump ring to be stuck in the two ends of stationary annular circle in the jump-ring slot in consent; When fixed plug is jump ring circle, directly jump ring is stuck in consent;

Described closed hole is the hole of shallow cylindrical or shallow cone cylindricality, answering the rank that form one-level annular between passage in magnetic piston and consent with the bottom of consent, the hole face in the hole of shallow columniform hole or shallow cone cylindricality is inner headed face or the internal conical surface that holds sealing plate, and the bottom surface of closed hole is porose below annular sealing surface;

Described sealing plate is circular flat board, and dull and stereotyped is simultaneously sealing surface below, and sealing surface coordinates with answering the closed hole on magnetic piston;

Described internal taper hole is the circular hole that has tapering, and the face of circular hole is inner conical surface; The small end of internal taper hole under, hold upper greatly, respectively in the sealing neck of the lower end in the hollow valve body of air outlet valve and in negative pressure shell; Inner conical surface coordinates with the male cone (strobilus masculinus) of sealing cone, under the effect of gravity that seals cone self, can seal inner conical surface, while having suction, can open inner conical surface and the passage that seals cone sealing by suction on sealing cone; Sealing cone air pressure is above larger, and sealing cone is better 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 the male cone (strobilus masculinus) that has tapering; The male cone (strobilus masculinus) of sealing cone is bored self during with inner conical surface sealing gravity by sealing presses down and seals inner conical surface;

Described restriction cap is calotte, and the crown part of calotte has the air passing hole that allows gas pass through, and the hatband partial fixing of calotte can limit the distance of moving on the sealing cone of installing on the inner conical surface in sealing neck on sealing neck;

Described field controller is to control the controller that generates an electromagnetic field of solenoid, controlling time and the time length generating an electromagnetic field that electromagnetic field produces and generate an electromagnetic field at every turn after to the interval time generating an electromagnetic field again for the second time;

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

Described aspirating hole be the air inner chamber that enters negative pressure shell through air passing hole, at the lower part in centre of sealing neck, above the upper end of the aspirating hole in sealing neck, have internal taper hole, when sealing cone is not installed in the internal taper hole in sealing neck, internal taper hole communicates with aspirating hole and pumping chamber;

In pumping chamber, lay in and wait to press from the air extracting in vacuum tank, in squish chamber, push air and produce air pressure and discharge outside negative pressure shell; In squish chamber, when exhaust, pumping chamber communicates with squish chamber; Discharge air in squish chamber time, pumping chamber is bored with answering the internal taper hole sealing in magnetic piston and is disconnected the passage of bleeding that enters squish chamber by sealing;

Described brake boost vacuum plant is in the process of exhaust, and controlling bleed-off passage and going out in the one-way check valve of air duct does not have return spring; In the time of pumping chamber exhaust, the suction of answering magnetic piston stroking upward to produce is opened the sealing of the internal taper hole in the sealing neck in sealing cone and negative pressure shell lower end and is opened the passage of bleeding, and is arranged on sealing plate on the closed hole of answering in magnetic piston decline return and close the passage of bleeding entering in squish chamber and seal automatically under the effect of self gravitation; In the time of the exhaust of squish chamber, be arranged on sealing cone on the internal taper hole of air outlet valve and utilize the gravity of self to make the sealing automatic decline return of cone and the passage of closing the discharge on air outlet valve seals, answer magnetic descent of piston and make to produce pressure promotion pumping chamber in and be arranged on the up passage of bleeding entering in squish chamber of then opening of sealing plate on the closed hole of answering in magnetic piston; While discharging air in squish chamber, under the effect that goes out atmospheric pressure, promote sealing cone on the internal taper hole of air outlet valve up and open the passage of giving vent to anger of air outlet valve, be arranged on sealing plate on the closed hole of answering in magnetic piston and utilize the gravity of self to make sealing plate automatically decline return and close the passage of bleeding of answering on magnetic piston and seal;

When use, teacher of the opening position key switch is connected the power-on circuit of insulated electric conductor and field controller, the power-on circuit that field controller is connected solenoid generates an electromagnetic field, the attraction that electromagnetic field produces pulls the pressure of answering magnetic piston to overcome iron core spring to move down, answer magnetic piston to start when descending, the sealing cone being arranged on the internal taper hole in the sealing neck of lower end in negative pressure shell is closed the passage of bleeding that enters pumping chamber under the effect of the gravity of self, sealing in air outlet valve cone descending return and seal the inner conical surface of air outlet valve under the effect of the gravity of self, cut off the outlet passageway in squish chamber, answer magnetic piston when descending, answer magnetic piston to promote to enter the air in pumping chamber and make air produce internal pressure, the air that has pressure is up from answering passage in magnetic piston to enter into continue after the closed hole of answering in magnetic piston is upwards washed the sealing of sealing plate and closed hole open and made sealing plate displacement, enters in squish chamber after the passage in fixed plug,

Answer magnetic descent of piston to move to the compression stage of compression iron core spring when spacing, the power-on circuit of field controller cutoff solenoid, magnetic field diminishes, answers magnetic piston up under the promotion of iron core spring; Answer magnetic piston to start when up, be arranged on sealing plate on the closed hole of answering in magnetic the piston descending and passage of bleeding of having closed air and enter squish chamber under the effect of the gravity of self; In the time answering magnetic piston stroking upward, answer the up of magnetic piston and make the air in squish chamber produce pressure, the air that has pressure enters into internal taper hole in air outlet valve from the endoporus of the sealed end of air outlet valve lower end, and to promote sealing cone up and open the seal channel of air outlet valve, and the air in squish chamber is entered in atmosphere after air outlet valve; Answer magnetic piston when up, answer magnetic piston also to make to have produced in pumping chamber pull of vacuum, pull of vacuum is inhaled the moving sealing cone that is arranged on the internal taper hole in sealing neck and is separated with internal taper hole, air in vacuum tank enters into internal taper hole from exhaust tube through aspirating hole, then enters answering in the pumping chamber below magnetic piston in negative pressure shell through the air passing hole on restriction cap;

Answer magnetic piston under the promotion of iron core spring when up putting in place, the sealing cone being arranged on the internal taper hole in the sealing neck of lower end in negative pressure shell is closed the passage of bleeding that enters pumping chamber under the effect of the gravity of self, sealing in air outlet valve cone descending return and seal the inner conical surface of air outlet valve under the effect of the gravity of self, has cut off the outlet passageway in squish chamber and makes air not return to pumping chamber; Now, the power-on circuit that field controller is connected again solenoid again generates an electromagnetic field and makes to answer magnetic descent of piston; So connection of circulation and cut off circuit, generates an electromagnetic field solenoid to pull to answer magnetic piston stroking upward and allow iron core spring promote to answer magnetic descent of piston, constantly the air in vacuum tank is extracted out and is entered in atmosphere.

2. brake boost vacuum plant according to claim 1, is characterized in that: keep the shape of protecting crust in order to ensure protecting crust can protect solenoid not to be damaged, manufacture the skeleton that has support in the inner chamber of protecting crust.

3. brake boost vacuum plant according to claim 1, is characterized in that: in order to make the air of answering magnetic piston can promote in the squish chamber in negative pressure shell enter air outlet valve, adopt iron core spring as the power that promotes to answer magnetic piston stroking upward.

4. brake boost vacuum plant according to claim 1, is characterized in that: adopt the teacher position key switch being connected with insulated electric conductor to come connection and the cut-out of the connecting circuit of controlling magnetic field controller.

5. brake boost vacuum plant according to claim 1, it is characterized in that: the compact conformation of described brake boost vacuum plant, vibrate little, utilization rate of electrical is high, powerful, the electric automobile and the internal-combustion engines vehicle that are applicable to the hydraulic braking of vacuum servo formula are installed and used, and also can produce normally vacuum and realize vacuum servo after engine stops; The market prospects of industrialization are good, commercial value is high, manufacture and use all very convenient.

6. the manufacture method of a brake boost vacuum plant, it is characterized in that: during fabrication, iron core spring adopts a type or the material manufacture of two types in metal and rubber, while adopting elastomeric material to manufacture, iron core spring creates hollow tubular type spring, utilizes the elasticity of rubber and shrinkage to realize the function of spring;

Protecting crust creates the hollow cavity of annular, manufactures wired hole on hollow cavity, and line hole creates the hole that allows insulated electric conductor pass; The parts of installing in field controller, solenoid and negative pressure shell and negative pressure shell are installed in hollow cavity, and the inner of the annular housing of hollow cavity is fixed on negative pressure shell;

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

The inner chamber of negative pressure shell creates columniform cavity, and the periphery of columniform cavity creates smooth curved surface; The centre bore, the lower end manufacture that have through negative pressure shell are manufactured in upper end on the center line of inner chamber aspirating hole and internal taper hole, and the negative pressure shell below upper and lower side and the sealing neck that seals neck is worn out in aspirating hole and internal taper hole stack; Manufacture at the middle part of the lower end in negative pressure shell sealing neck protruding upward, and the upper part of the inside of sealing neck creates internal taper hole, lower part creates aspirating hole, and internal taper hole communicates with aspirating hole, and internal taper hole coordinates with sealing cone;

Air outlet valve creates hollow valve body and sealing cone two parts, hollow valve body creates hollow pipe, internal taper hole is manufactured on middle part or the middle and lower part of the inner chamber of hollow pipe, and the internal diameter internal diameter large, that lower part is manufactured that the upper part of the internal taper hole in hollow pipe is manufactured is little; Manufacture the lower end of hollow valve body return-air sealed end, lower end, upper surface that the lower surface of return-air sealed end is manufactured on hollow valve body create internal taper hole, the large 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, and sealing cone is installed on the inner conical surface of internal taper hole; When enter the air of pressure from the endoporus of hollow valve body lower end, can open inner conical surface and form passage with the sealing of sealing cone;

For the ease of the processing of negative pressure shell be convenient to accessory to pack in negative pressure shell, described negative pressure shell creates the assembly after segmental machining is manufactured; The upper end of the circular cylindrical cavity part in negative pressure shell is divided into two sections of manufactures, the upper part of segmentation place creates pump cover, lower part and creates the main body of negative pressure shell, centre bore is manufactured on pump cover, aspirating hole is manufactured on the middle part of the main body lower end of negative pressure shell, and it is a composite entity that the main body after pump cover and negative pressure shell is combined into after manufacturing; Or, the lower end of the circular cylindrical cavity part in negative pressure shell is divided into two sections of manufactures, the lower part of segmentation place creates pump cover, upper part and creates the main body of negative pressure shell, aspirating hole is manufactured on the middle part of pump cover, centre bore is manufactured on the middle part of the upper end of the main body of negative pressure shell, and it is a composite entity that the main body of pump cover and negative pressure shell is combined into after manufacturing;

Answer magnetic piston to create columniform iron core, the periphery of columniform iron core creates smooth periphery, manufactures the annular groove that has depression on smooth periphery, and annular groove is embedded with sealing ring; Described periphery coordinates inner chamber that can sealed negative-pressure shell with the inner chamber of negative pressure shell, and can in the inner chamber of negative pressure shell, slide; Manufacture in the cylinder centre of described columniform iron core through hole, and through hole communicates with squish chamber and pumping chamber; Described through hole creates upper surface, the lower part that upper part runs through iron core and runs through iron core lower surface, 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 closed hole; On passage, manufacture and have closed hole, the manufacture above of closed hole has consent; Described passage creates the via hole that allows air pass through, and communicates with pumping chamber and consent; Described consent creates the hole of installation and fixing fixed plug, communicates with passage and squish chamber;

Fixed plug has the plug of passage in the middle of creating, and has cylinder or annular ring or the jump ring circle of through hole in the middle of described plug creates, and can limit the distance that the sealing plate that is arranged in the closed hole of answering in magnetic piston moves up; While having the cylinder of through hole in the middle of fixed plug creates, the fixing employing interference fit in consent is fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixed cylinder in the jump-ring slot in consent; When fixed plug creates annular ring, the fixing employing interference fit in consent is fixed or is adopted jump ring to be stuck in the two ends of stationary annular circle in the jump-ring slot in consent; When fixed plug creates jump ring circle, directly jump ring is stuck in consent;

Described closed hole creates the hole of shallow cylindrical or shallow cone cylindricality, be manufactured on the rank that form one-level annular between the passage of answering in magnetic piston and consent with the bottom of consent, the hole face in the hole of shallow columniform hole or shallow cone cylindricality creates the inner headed face or the internal conical surface that hold sealing plate, and the bottom surface of closed hole creates porose annular sealing surface below;

Sealing plate creates circular flat board, dull and stereotyped simultaneously creates sealing surface below, and sealing surface coordinates with answering the closed hole on magnetic piston;

Internal taper hole creates the circular hole of tapering, and the face of circular hole creates inner conical surface; The small end of internal taper hole under, hold upper greatly, be manufactured on respectively in the hollow valve body of air outlet valve and be manufactured in the sealing neck of the lower end in negative pressure shell; Under the effect of gravity that seals cone self, inner conical surface can be sealed, have suction on sealing cone time, inner conical surface and the passage that seals cone sealing can be opened by suction; Sealing cone air pressure is above larger, and sealing cone is better with the gluing, sealing effect of inner conical surface;

Sealing cone creates cone or cone cylinder, and the annular surface of cone or cone cylinder creates the male cone (strobilus masculinus) of tapering; The male cone (strobilus masculinus) of sealing cone is bored self during with inner conical surface sealing gravity by sealing presses down and seals inner conical surface;

Restriction cap creates calotte, and the crown part of calotte is manufactured the air passing hole that allows gas pass through, and the hatband partial fixing of calotte can limit the distance of moving on the sealing cone of installing on the inner conical surface in sealing neck on sealing neck;

Field controller creates controls the controller that generates an electromagnetic field of solenoid, controlling the time that electromagnetic field produces and generate an electromagnetic field the length of time and generate an electromagnetic field at every turn after to the interval time generating an electromagnetic field again for the second time;

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

Aspirating hole create air enter negative pressure shell inner chamber through via hole, be manufactured on the lower part in the centre of sealing neck, above the upper end of the aspirating hole in sealing neck, manufacture and have internal taper hole, when sealing cone is not installed in the internal taper hole in sealing neck, internal taper hole communicates with aspirating hole and pumping chamber;

Keep the shape of protecting crust in order to ensure protecting crust can protect solenoid not to be damaged, in the inner chamber of protecting crust, manufacture the skeleton that has support;

In order to make the air of answering magnetic piston can promote in the squish chamber in negative pressure shell enter air outlet valve, adopt iron core spring as the power that promotes to answer magnetic piston stroking upward;

Solenoid is installed in protecting crust, and solenoid is fixed on the lower part of negative pressure shell outside, and protecting crust is fixed on the outside protection solenoid of the lower part of negative pressure shell; 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; The circuit that connects solenoid is connected with field controller, and the circuit of field controller is connected with insulated electric conductor, and field controller is arranged in protecting crust; Restriction cap, sealing cone, iron core spring are installed in negative pressure shell, answer magnetic piston, sealing plate, fixed plug, answer magnetic piston to be arranged on the upper part of the inner chamber of negative pressure shell, iron core spring fitting is at the lower part of the inner chamber of negative pressure shell, lower end, top, upper end that the lower end of iron core spring is pressed in negative pressure shell are pressed in the bottom of answering magnetic piston, answer magnetic piston can slide up and down in the inner chamber of negative pressure shell; In closed hole below the consent of answering in magnetic piston, sealing plate is installed, sealing plate can move up and down in closed hole, displacement when fixed plug is installed in consent limits sealing plate and move up, the fixing employing interference fit of fixed plug in consent fixed or threaded engagement is fixed or adopt jump ring to be stuck in the two ends of fixing fixed plug in the jump-ring slot in consent; When sealing surface below sealing plate coordinates with the annular sealing surface of closed hole and seals, the passage of bleeding of answering on magnetic piston can be closed, when the sealing surface below sealing plate separates with the annular sealing surface of closed hole, the passage of bleeding of answering on magnetic piston can be opened; Sealing cone is installed in the internal taper hole in the sealing neck of the lower end in negative pressure shell, and restriction cap is fixed on the outside of sealing neck by screw thread or jump ring; Sealing cone with seal internal taper hole in neck and coordinate and can seal or open the passage of bleeding entering in negative pressure shell; While answering magnetic piston stroking upward, answering the inner chamber part of the negative pressure shell of magnetic piston lower part is pumping chamber; While answering magnetic descent of piston, the inner chamber part of answering the negative pressure shell of magnetic piston upper part is squish chamber; Aspirating hole place in the lower end of negative pressure shell is fixed with exhaust tube, and the other end of exhaust tube is connected with vacuum tank, and the endoporus of exhaust tube communicates with aspirating hole and vacuum tank; Upper end at negative pressure shell is provided with air outlet valve, and the lower part of air outlet valve is fixed in the centre bore of one end above of negative pressure shell, and the upper surface of negative pressure shell is exposed in the upper end of air outlet valve.