71results about How to "Increase electromagnetic attraction" patented technology

The invention relates to an electromagnetic train. The electromagnetic train comprises a line rail, a driving system, a train body, a guiding system and an electromagnetic supporting system. A plurality of long stators are mounted on two sides of the line rail along a driving direction; the driving system comprises the long stators, and the train body comprises train body supporting racks and compartments; the guiding system comprises guiding magnets, guiding rails, guiding air gap sensors and guiding controllers; the electromagnetic supporting system comprises rotors, rotor controllers and train body load sensors, wherein the rotors are located below the long stators, and a small air gap is formed between each rotor and the corresponding long stator and ranges from 2 mm to 6 mm; and the rotor controllers adjust the exciting currents of the rotors in real time, so that the electromagnetic forces generated by the rotors are equal to the train body load. The train body is in contact with the line rail through a supporting skid at the bottom of the train body. According to the electromagnetic train provided by the invention, the air gap sensors are not needed to be suspended, so that the electromagnetic train is small in power consumption, light in self weight, low in cost and simple to control and runs stably.

The invention relates to the field of building material mechanical field, in particular to a forming device of electromagnetic artificial quartz stone, which solves the problems that the vibration frequency improvement is limited, the electromagnetic power is a little high and the attractive force is too small when setting the electromagnet in the prior forming apparatus, the forming apparatus comprises a base, an upper structural frame, a vacuum chamber which has an inner couplers hold-down, a drive rod which is fixed on the hold-down and controlled by the electromagnet to make up or down movement, and a compression spring which enables the drive rod to make reciprocating movement, the bottom of the movable iron core of the electromagnet is a convex conoid or a concave conoid, a static iron core which is facing to the bottom of the movable iron core and forms a parallel gap with the bottom of the movable iron core is a concave conoid or a convex conoid, and 45 DES is less than or equal to the conic angle Alpha is less than or equal to 120 DES. The forming device of electromagnetic artificial quartz stone has the advantages of rational and simple structure, low cost, good molding effect, and can achieve the high vibration frequency pressing and reciprocating shifting pressing; in the production of artificial quartz stone, the polyester resin amount is low, the compactness of the pressing product is high, and the mixture of cement and clay can be pressed into hollow bricks.

The invention discloses a cleaning device of a reserved steel bar. The device comprises a mobile base, a vertical lifting rod, a rotation motor, a rotation shaft, connection rods, sliding blocks, first springs and arc brushing boards; the rotation shaft is horizontally arranged, and two or more connection rods are evenly arranged at the other end of the rotation shaft in the circumferential direction; a sliding block is connected to each connection rod in a sliding mode, and an arc brushing board is fixedly arranged on each sliding block respectively; all arc brushing boards comprise arc electromagnets, water filling bags, second springs, arc supporting plates and brush hair; the water filling bags are fixedly glued to the inner sides of the arc electromagnets, and the arc supporting plates are arranged on the inner sides of the water filling bags and fixedly connected with the arc electromagnets through the second springs; a plurality of water spraying holes are formed in the sides, towards the arc supporting plates, of the water filling bags, and a plurality of through holes corresponding to the water spraying holes are formed in the arc supporting plates; the brush hair is evenly arranged on the inner side walls of the arc supporting plates. According to the cleaning device of the reserved steel bar, sliding and adjustment can be conducted according to the position and height of the reserved steel bar, the labor intensity is low, and the cleaning efficiency is high.

The invention discloses an electromagnetic type magnetic rail brake, which is used for braking a railway vehicle when the railway vehicle runs. M electromagnets are equidistantly arranged in longitudinal space between rails and a longitudinal beam along the longitudinal direction of the rails, m is more than or equal to 2, the axial directions of the electromagnets are simultaneously perpendicular to the rails and the longitudinal beam, and two protecting stop blocks made of soft magnetic materials are symmetrically arranged at the two longitudinal ends of the longitudinal beam and are positioned between the longitudinal beam and the rails; opposite currents are inputted in each two optional adjacent electromagnets; the two protecting stop blocks and the two electromagnets which are closest to the protecting stop blocks form a magnetic circuit; the two electromagnets which are closest to the protecting stop blocks and the longitudinal beam form a magnetic circuit; the two electromagnets which are closest to the protecting stop blocks and the rails form a magnetic circuit; the two electromagnets which are closest to the protecting stop blocks and an air gap form a magnetic circuit; (m-1) closed working magnetic circuits consist of each two optional adjacent electromagnets, the longitudinal beam, the rails and the air gap; each two adjacent magnetic circuits share an electromagnet, and each electromagnet provides excitation for the two corresponding magnetic circuits; and the protecting stop blocks of which the ends have a protecting effect and the electromagnets adjacent to the protecting stop blocks form the magnetic circuits, so that the number of the electromagnets is reduced, the longitudinal space is saved, and the electromagnetic attraction is increased.

A glue ejector driven by electromagnetic suction includes a nozzle, a glue cavity, a thermal cavity, a spray needle spring pretightening device, an electric magnetic body and a stroke adjusting knob. One end of the glue cavity is rotationally provided with the nozzle through the thermal cavity and the other end is connected with the lower end of the spray needle spring pretightening device through a nut; the electromagnetic body is arranged inside a housing; the top part is rotationally provided with the stroke adjusting knob and arranged below the spray needle spring pretightening device. The present invention utilizes an electromagnetic force to realize a larger drive force and adopts a chock block to remove the collision between the spray needle and the nozzle so as to improve the service life of the spray needle and realize a small-sized spray needle, thereby reaching the goal of micro-amount glue spraying and large viscosity glue spraying. The glue ejector provided by the present invention has the advantages of simple structure, convenient use, adjustable spraying speed and glue spraying amount, long service life, being suitable for industrialization manufacture, being able to replace the existing spring- pneumatic drive glue spraying system and being suitable for the sealing and packaging of micro-electric chips in particular.

The invention relates to a light fast-response electromagnetic valve which comprises a coil assembly, a valve seat base, a valve spool, a spring and a control circuit. An inlet channel of the valve seat base is communicated with an annular liquid collecting tank, a valve seat is arranged at a junction of the upper end surface of an outlet channel and the annular liquid collecting tank, a stepped hole is formed in the center of the valve spool, a first sealing assembly is arranged on the lower end surface of the valve spool, the coil assembly comprises stop iron, a non-magnetic ring, a lower end, a coil, a shell and a balance bar, the other end of the balance bar extends into the stepped hole of the valve spool and is peripherally in clearance fit with the stepped hole, a second sealing assembly is arranged at a fit position of the balance bar and the stepped hole, the sealing area of the second sealing assembly is equal to the sealing area of the first sealing assembly, a spring cavity is formed by the lower end surface of the balance bar and the stepped hole of the valve spool, and the spring is positioned in the spring cavity. The light fast-response electromagnetic valve has the advantages that the problem that an existing electromagnetic valve cannot meet the requirement of a specific system on a light and small control valve is solved, and the electromagnetic valve is light and small, and is fast in response and low in power consumption.

The invention provides a single-pixel structure, a digital micro-mirror device with the same and production method of the single-pixel structure and the digital micro-mirror device. The single-pixel structure comprises a substrate, a first conductive component and a reflector. The first conductive component is disposed on the substrate and provided with a left conductive part and a right conductive part. The reflector is disposed above the first conductive component in a suspension manner through a support structure which is disposed on the substrate or the first conductive component. The reflector comprises a reflecting part and a drive part vertical to the reflecting part. Part of the drive part extends to a part between the left conductive part and the right conductive part. Under a normal state, the drive part is vertical to the upper surface of the substrate and does not contact with the left conductive part and the right conductive part; when the left conductive part and the drive part apply voltage opposite in electric property, the drive part deflects towards the left conductive part; when the right conductive part and the drive part apply voltage opposite in electric property, the drive part deflects towards the right conductive part. By the structure, the reaction sensitivity of the reflector is increased, and the miniaturization manufacturing requirements of DMD chips are satisfied.

The invention is a flow measuring and control method for measurable and controllable electromagnetic valves, belonging to the automation technical field. And the invention firstly makes measurable and controllable flow electromagnetic valve, signal processing controller and power switch compose a flow measuring and control system, where the measurable and controllable flow electromagnetic valve transmits pressure difference between upper and lower valve fluids to the pressure input port of a pressure difference sensor so that the fluid pressure difference is converted through the pressure difference sensor into fluid pressure difference electric signal to output to the input end of the signal processing controller, the signal processing controller calculates the current detected flow according to the input fluid pressure difference and the output current of an electrified coil and compares it with the given flow to output control instruction to change the current of the electrified coil so as to control the valve opening and achieve the purpose of flow control. And the invention implements integration of flow measurement and control, and can conveniently control regulating rule of the valve opening by algorithm.

The invention provides a suspension type permanent magnet suspension train bogie. The bogie comprises a bogie frame, a hanging device, a guide device and a brake device. The bogie can establish a space rectangular coordinate system by taking the center of the bogie as an original point; the forward direction of the bogie is taken as the X-axis forward direction; the left-right deviation directionof the bogie is used as the Y axis, the up-down suspension direction of the bogie is used as the Z axis, only the moving freedom degree of the bogie in the X-axis direction is reserved in the six directions of the space, and devices capable of adjusting the running posture of the bogie are arranged in the other directions. Therefore, stable running of a train can be guaranteed from multiple dimensions.

The invention provides an overcurrent electromagnetic release which comprises a armature, a reset spring and an annular yoke rack. The armature moves upwards to control a corresponding system to release when short circuit currents pass a system circuit. The reset spring drives the armature to move downwards to reset. The yoke rack is provided with a peripheral annular wall and a central hole. The central hole is enclosed by peripheral annular wall, extends along a front-rear direction, and allows the system circuit to penetrate to form an electromagnet. An upper notch is formed in the inner wall surface of the top annular wall of the yoke rack. The armature is assembled into the upper notch in a guide moving manner along an up-down direction. The overcurrent electromagnetic release has the advantages that the yoke rack is added to increase the electromagnetic attractive borne by the armature of the whole release, the application range of the electromagnetic release is expanded, and electromagnetic release miniaturization is benefited.

The invention discloses a magnetic latching relay with double flexible pushing connections. The magnetic latching relay comprises a magnetic circuit system, a contact system, a pushing part and a base, wherein the pushing part contains a pushing clip; the pushing clip is connected between the movable magnetizer part of the magnetic circuit system and the movable spring part of the contact system; one end of the pushing clip is connected with the movable magnetizer part of the magnetic circuit system in a flexible pushing manner; and the other end of the pushing clip is connected with the movable spring part of the contact system in a flexible pushing manner. By adopting the structure, the flexible pushing connection of the pushing clip and the movable spring part can be utilized to provide a counter force for the reset of the relay; the flexible pushing connection of the pushing clip and the magnetic circuit system can also be utilized to fill the magnetic air gap caused by the fitting allowance extremely through flexible deformation, thus increasing the electromagnetic attraction and reducing the coil power dissipation; and the force generated through the self-deformation of the flexible pushing connection can also provide a counter force for the relay, thus balancing the movement and reset acting force of the magnetic latching relay.

The invention discloses a direct-current self-lubricating guide resettable electromagnet, and belongs to the field of electromagnets. The electromagnet comprises an armature, an iron core, a shell, acoil, a spring, a first bushing, a second bushing, a connecting rod and an end cover, wherein the shell is of a tubular structure with an opening in one end, and a through hole is formed in the centerof the other end of the shell; the coil is coaxially installed in the shell through a coil rack, and a center hole is formed in the coil rack along the center axis; and the iron core and the armatureare coaxially arranged in the center hole of the coil rack. When the coil is powered on, the coil, the armature, the iron core and the air gap form a complete electromagnetic loop, the armature overcomes the elastic force of the spring in the iron core through electromagnetic force to move axially and attract the iron core, and the electromagnet provides traction force for an external connectionpiece; and when the coil is powered off, the electromagnetic force of the armature is zero, the armature resets under the elastic force effect of the spring, and the electromagnet completes the release function. The electromagnet has the advantages of small size, light weight, long service life and short response time, and the service life of the electromagnet can be five times or above that of atraditional direct-current electromagnet.

The invention discloses a braking method of a tractor and a low-noise brake. An armature is operated through a mode that the armature is attracted through an iron core; when braking is required, the armature compresses a brake disc fixed to a mounting shaft of the tractor on a mounting end cover; as the armature can not rotate relative to the mounting end cover and can only axially move, the armature can brake the tractor; and when the armature is pressed to the brake disc, an elastic shock strut is arranged on the back of the armature, so that the impact noise produced when the armature is instantaneously pressed to the brake disc is avoided. By arranging the shock strut on the armature of the electromagnetic brake, when the armature is pressed to the brake disc, the shock strut on the armature collides with the mounting end cover firstly, so that the impact noise produced when the armature is instantaneously pressed to the brake disc is avoided. The elastic shock strut is very easy to compress and damage when being pressed, so that the pressure to the brake disc is reduced to be the smallest, and the braking effect can not be affected.

The invention discloses an arc extinguishing and short circuit current resisting direct-current relay, which comprises two static contact leading-out ends, a straight sheet type movable contact spring, a push rod component and three pieces of magnetic steel. Two of the three pieces of magnetic steel are respectively arranged at the outer sides of two sides of the width of the movable contact spring and are positioned at the position corresponding to one movable and static contact, and the magnetic poles of one surfaces of the two pieces of magnetic steel, which face the movable and static contact, are set to be the same; the other piece in the three pieces of magnetic steel is arranged on the outer side of one side of the length of the movable contact spring and is positioned at the position corresponding to the other movable and static contact; and the pole surface of the other piece of magnetic steel is approximately vertical to the pole surfaces of the two pieces of magnetic steel,so that the Lorentz force generated by the movable contact spring in an arc extinguishing magnetic field formed by the three pieces of magnetic steel is approximately zero. The defect that the short circuit current resisting capability of the product is reduced due to an arc extinguishing magnetic field can be eliminated.

A solenoid valve has a valve body with first and second ports. A bobbin is mounted to the valve body. A winding is wound on the bobbin. A stator is fitted to one end of a hole through the bobbin and defines a third port therein. A plunger is slidably fitted to the hole and movable between a normal position and an energized position. Two plugs are installed at respective ends of the plunger and arranged to selectively close the first and third ports. A flux return device is fixed to the stator and the bobbin. A spring returns the plunger from the energized position, where the plunger closes the third port and the first and second ports communicate with each other via the hole in the bobbin, to the normal position, where the plunger closes the first port and the second and third ports communicate with each.

The invention discloses a pilot type fire-fighting electromagnetic valve which comprises an electronic valve controller outer shell. An electromagnetic valve body is arranged below the electronic valve controller outer shell, and a movable iron core piston is arranged in the middle of the interior of the electronic valve controller outer shell. A movable iron core is arranged on the movable iron core piston. A piston lower supporting column is arranged under the movable iron core piston. Inductive coils are arranged on the two sides of the movable iron core piston. According to the pilot type fire-fighting electromagnetic valve, a structure combining the direct stepped mode with the pilot mode is adopted, and the phenomenon that the valve cannot be opened due to pressure difference is avoided. Parts and components, such as a valve deck and main and auxiliary valve elements, in contact with media are plastic products which are made of special materials through a special technique, failures such as rust and jamming caused by materials are completely eradicated, and the effect that the valve can be opened normally even though the valve is not used for years is guaranteed. By the adoption of the special technique, the movable iron core component space is completely isolated from the media, and rusting is prevented.

The invention relates to a large-diameter direct-acting type high-pressure solenoid valve. The large-diameter direct-acting type high-pressure solenoid valve which is of a coaxial integral structure comprises a valve body, a coil housing, a coil, a spring, a valve core, a valve seat and an O ring, wherein the valve body is arranged on the upper part of the solenoid valve, medium inlet connecting threads are formed on the upper end of the valve body, a solenoid coil is wound on the circumference of the middle part of the valve body, and the coil housing is arranged on the outer side of the solenoid coil. According to a control method, a two-position two-way direct-acting type structure is adopted, the solenoid valve is opened after energization and is closed after deenergization, and a fluid medium flows into from the upper part of the valve body and flows out from the lower part of the valve seat. Compared with the prior art, the large-diameter direct-acting type high-pressure solenoid valve has the obvious advantages that (1) the diameter is large, the working pressure is high, the sustainable conduction time is long, and therefore, large-flow media can be continuously and stably supplied; (2) the action response speed is high (less than or equal to 10 ms), the solenoid coil of the solenoid valve is large, the sectional area of the valve core is large, so that large electromagnetic force can be generated, and therefore, the response speed is high.

The invention provides integrated variable-frequency water supply equipment. The equipment comprises a filter box, a temperature control box and a water supply box; the lower side face of the filter box communicates with the top end of a first circulating pipe; the bottom end of the first circulating pipe extends into the temperature control box; the left end of the top of the filter box is connected with the left end of a cover plate through a connecting hinge; a motor bottom plate is fixed to the lower portion of the left side face in the filter box; a motor is fixed to the top face of the motor bottom plate; an output shaft is arranged at the top power output end of the motor; the top end of the output shaft extends into a smashing groove; a smashing cutter is fixed to the top end of the output shaft; an upper shielding plate is arranged over the smashing groove; the left end of the upper shielding plate is fixed to the upper portion of the left side face in the filter box; and an abutting rod is fixed to the lower surface of the right end of the upper shielding plate. According to the technical scheme disclosed by the invention, the technical problems that in the prior art, the water flow filtering capacity is not achieved, water tank temperature control cannot be achieved, and the water supply flow cannot be flexibly adjusted are effectively solved, and the application and popularization are facilitated.

A glue ejector driven based on electromagnetic expulsive force comprises a nozzle, a spray needle, a glue cavity, a thermal cavity, a spray needle spring pretightening device and an electromagnetic body. The pray needle spring pretightening device comprises a pretightening force adjusting knob, a stroke regulating knob and a pretightening spring; the electromagnetic body comprises an upper connection body, a location chock block, a lower connection body, a magnet core, a loop, a gag bit, an adjustable baffle and a pretightening nut; the invention leads an electromagnet and the gag bit to exclude mutually by controlling the galvanizing voltage of the electromagnet to drive the spray needle to move upwards and compress the spring, then the spray needle restores under the action of the spring; thereby leading the spray needle to reciprocate, so as to reach the aim of spraying glue. The glue ejector of the invention has the advantages of simple structure, convenient use, adjustable spraying speed and glue spraying amount, long service life, which is suitable for industrialization manufacture, is capable of replacing the existing spring-pneumatic drive glue spraying system and is suitable for the sealing and packaging of micro-electric chips in particular.

The invention discloses a middle-arranged magnetic steel magnetic circuit structure with inclined surface contact. The magnetic circuit structure comprises an upper iron core (2), a lower iron core (8), an armature (4), a transmission rod (9) and a magnetic part for providing a generated magnetic loop, wherein the upper iron core (2) and the armature (4) are in plane contact, the lower iron core (8) and the armature (4) are in inclined surface contact, one end of the transmission rod (9) is connected with the armature (4), a main pressure spring (7) is arranged between the transmission rod (9)and the armature (4), and the magnetic part is positioned at the peripheries of the upper iron core (2) and the lower iron core (8). According to the invention, the contact surface of the armature end surface of the magnetic circuit structure and the lower iron core adopts an inclined surface structure, so that the initial electromagnetic attraction force is increased by more than one time compared with the plane contact structure, and the rigidity of the spring can be doubled due to the fact that the electromagnetic attraction force is doubled so as to double the vibration resistance of theproduct, substantially improve the vibration performance index and meet the vibration index requirement of the aerospace contactor.

The invention provides a Halbach array permanent magnet hybrid electromagnetic suspension system which comprises a guide rail, an inner pole Halbach array permanent magnet, a suspension coil, an electromagnetic iron core and an outer pole Halbach array permanent magnet. The guide rail is made of a soft magnetic material and has an F-shaped structure; the electromagnetic iron core is made of soft magnetic silicon steel sheet materials and is of a U-shaped structure, the end of the electromagnetic iron core is of an expanding type, and the inner pole Halbach array permanent magnet and the outerpole Halbach array permanent magnet are arranged at the same time and correspond to guide rail magnetic poles. The suspension coil is wound on the electromagnetic iron core. The system has the characteristics of low power consumption and large levitation air gap and is suitable for the electromagnetic levitation system for the maglev train.

The invention discloses a magnetic force system of an electromagnetic relay. The magnetic force system comprises a coil, an iron core, a yoke and an armature. The yoke comprises a first portion and a second portion which are connected to each other, the second portion of the yoke is connected to a first end of the iron core, and the first portion of the yoke extends along the length direction of the iron core and is spaced from the coil. The armature comprises a main body portion which faces the end surface of a second first end of the iron core, and a bending portion which bends at a predetermined angle from the main body part; and the surface of a section, arranged on the first portion of the yoke, of the bending portion of the armature faces the inner side of the iron core, and is opposite to the tail end part of the first portion of the yoke. According to the magnetic force system, the sectional area of a magnetic gap between the armature and the yoke is defined by the surface, facing the yoke, of the bending portion of the armature, thus the sectional area of the magnetic gap between the armature and the yoke can be enlarged by enlarging the surface area of the bending portion, so that the electromagnetic attraction of the yoke to the armature can be conveniently increased.

The invention provides a switch parallel capacity expansion operation control method based on a single-pole contactor. A two-phase intelligent electromagnetic switch which operates in a parallel modeis included. The electromagnetic switch comprises an intelligent control module and two single-pole contactors; the intelligent control module comprises a synchronous control module, a contact state monitoring module, a coil current controller, a contact sampling circuit and a coil voltage sampling circuit; the contact state monitoring module judges a contact working condition; when switching-on is needed, the synchronous control module enables the switch to be switched on under the working condition of synchronous phasing; when switching-off is needed, the synchronous control module enables the switches to coordinate with each other and to be switched off under the working condition of synchronous zero current. According to the invention, a normal coil current adaptive control mode and anabnormal coil current adaptive control mode are designed, so the stable holding of the two switches during parallel capacity expansion operation is realized; the closed-loop control is performed in the whole process of parallel operation of the two-phase switches, so the synchronism of switching-on and switching-off actions of the switches and adaptive control of the holding process are realized;the switch capacity can be effectively improved, and the application range is widened.

The invention provides an electromagnetic coil groove of an automobile air-conditioning clutch. The inner wall, the outer wall and the bottom of the electromagnetic coil groove are all formed at one time in a cold extrusion manner; the bottom of the electromagnetic coil groove is a plane. The electromagnetic coil groove provided by the invention is precisely formed at one time in the cold extrusion manner, further processing is not needed, the resource is saved, the cost is lowered, and the production efficiency is improved. As the bottom of the electromagnetic coil groove is a plane, coils can be easily flattened when being assembled, and the electromagnetic sucking force of the coils is increased.

The invention discloses a novel composite proportional electromagnet comprising a shell, a magnetic isolating ring, an armature, a left cover plate, a left pressure regulating nut, a right cover plate and a right pressure adjusting nut, wherein the magnetic isolating ring is sheathed in the shell; the armature is located in the magnetic isolating ring; the left pressure regulating nut is connected to a right end of the armature; the left cover plate is fixed on a left end of the shell; the right pressure adjusting nut is connected to the right end of the armature; and the right cover plate is fixed on the right end of the shell. According to the novel composite proportional electromagnet disclosed by the invention, the traditional magnetic isolating ring structure is replaced by a thin-walled structure, thereby simplifying the system structure, reducing the processing procedures and improving the production efficiency; the end face of the armature is changed to improve the electromagnetic attraction and improve the output force characteristics; and the pre-tightening forces acting on the two ends of the armature can be conveniently adjusted through pressure regulating springs to realize the adjustability of the acting force of the proportional electromagnet at a certain voltage or current. The novel composite proportional electromagnet disclosed by the invention is simple in structure, convenient to use and excellent in performance, can realize bidirectional displacement output, and can be directly connected with a valve core of a slide valve so as to control the bidirectional position proportion of the valve core of the slide valve.

The invention provides a pilot valve assembly. The pilot valve assembly comprises a sleeve structure, a first movable iron core, an elastic device, a static iron core and a fixing device, wherein thesleeve structure is of a hollow cuboid structure, and the sleeve structure is arranged in an inner cavity of a coil framework; the first movable iron core is of a cuboid structure, and the first movable iron core is provided with a first surface, a second surface and a first side surface; the first movable iron core is inserted into the hollow cuboid structure, a guide head is arranged on the first surface, the elastic device sleeves the guide head, and the static iron core is of a cuboid structure; the static iron core is provided with a third surface, a fourth surface and a second side surface, and the static iron core is arranged in the hollow cuboid structure; the fixing device is arranged on the third surface, and the iron cores are fixedly connected with a shell through the fixing device. According to the pilot valve assembly, the sleeve structure is changed from a circular shape to a rectangular shape, and electromagnetic force is increased; an electromagnetic valve using the pilot valve assembly can save energy by 20-70%, the wire diameter under the same power is reduced, and the cost is reduced; the pilot valve assembly is easy to process; the movable iron core and the static iron core are not likely to attract each other.

A electromagnetic power-source master switch, that is: the outer shell fixes on the bracket, the outer shell includes: the base total parts, the contact total parts, the flange plate, the loop groupware, the iron core, the underboarding, the flange plate sets on the top of the loop groupware, the contact total parts sets on the flange plate, the base total parts covers on the top of the contact total parts, the base boundary connects with the flange plate and sets the sealing ring at the connection, the iron core fixes in the loop groupware, the bottom of the loop groupware sets the underboarding covering on the loop groupware, between the iron core, the underboarding and the underside of the outer shell groupware sets copper underlay. The copper underlay sets in the loop groupware and clings at the underboarding closely with the separating magnetism and antijamming function. The invention is: collects the magnetic force line to the center of the iron core and improves the electromagnetism suction because of adding the underboarding parts; adds the copper parts with the separating magnetism and antijamming function.