CN2037499U - Contact maker by permanent magnet keep closing - Google Patents

Abstract

The utility model relates to a contact maker by a permanent magnet keep closing, mainly composed of a permanent magnet [2], a soft magnet core [3], [20], an exciting coil [4], [19], an armature [6], a contact system, etc. The utility model has the advantages of no noise, long service life, electricity saving, convenient maintenance, self locking without an assistant lock, not easy to burn out the coil, not affected by network voltage short time fluctuating, etc. The contact maker by the permanent magnet keep closing can substitute a large part of electromagnetic contact makers widely used at present. The contact maker by the permanent magnet keep closing is suitable for various places of needing frequently switching on and switching-off a main circuit and controlling the main circuit in a remote distance.

Description

Contact maker by permanent magnet keep closing

The utility model relates to a kind of improved contactor, particularly a kind of energy-saving contactor that keeps adhesive with permanent magnet.The utility model can replace present widely used most of electromagnetic treadle.

Contactor is a kind ofly can connect and cut off various power consumption equipment main circuits continually and main circuit is carried out remotely-controlled automatic switch, is one of element important and commonly used in the automatic control system.The contactor of extensive use at present mainly is an electromagnetic treadle, and model commonly used has CJ0, CJ10, CJ12 etc.Electromagnetic treadle mainly is made up of electromagnetic system and contact system, its operation principle can be summarized as follows: when switching on to magnet exciting coil, produce magnetic flux in the iron core, produce suction at end face of iron core and armature opposite position, this suction attracts armature movement, make it to be pulled together with iron core, simultaneously armature drive the moving contact motion and with the fixed contact closure, controlled main circuit is connected; When the magnet exciting coil dead electricity, suction disappears, and armature separates with iron core under the retracting spring effect, and armature and contact all recover original state, and controlled circuit is disconnected.Obviously, make contactor keep attracting state, must in magnet exciting coil, continue to feed electric current, thereby will consume certain holding power, cause waste of electric energy.This is the disadvantage of common contactor.Another apparent in view shortcoming is: common contactor must be with the auxiliary contact self-locking keeping holding current, thereby make complex structure.

In alternating current circuit, must use A.C. contactor.Because A.C. contactor is than the shortcoming of D.C. contactor more (coil, life-span weak point etc. greatly, are easily burnt in, loss big as noise), so someone has used A.C. contactor DC operation technology, promptly make contactor keep attracting state, to reduce power consumption, improve power factor, reduce noise, to prolong the contactor life-span with direct current.But contactor still will consume a part of holding power after adopting this improvement technology, still needs the auxiliary contact self-locking, and shortcoming is not eradicated.

Additional mechanical snap close and release electromagnet just can not consume holding power on contactor, but the installation of mechanical lock buckle mechanism and release electromagnet and adjust more complicated, maintenance load is big, thereby can not be extensive use of.

Though the electric energy of a contactor consumption is smaller, the consumption of contactor very big (according to statistics, having half electric energy to be assigned to various power consumption equipments by contactor in the electric power system) in industrial and mining enterprises is so the total electric energy that consumes is very considerable.For electricity saving and energy saving, must the more effective energy-saving contactor of research.

Task of the present utility model is that a kind of improved contactor will be provided, and its adopts permanent magnet to make unshakable in one's determination and armature maintenance adhesive, consumed power not during sticking.The utility model is compared with various prior aries, noiseless when having economize on electricity, sticking, easy to maintenance, do not need the auxiliary contact self-locking, be difficult for burning coil, the life-span is long, the advantages such as influence that not fluctuateed in short-term by line voltage, thereby can overcome the shortcoming of prior art effectively.

Task of the present utility model can adopt as shown in drawings, and scheme realizes.Accompanying drawing is the schematic diagram of a kind of concrete structure of the utility model.

Among the figure, (1), (8), (16), (18) are shell, (2) are permanent magnet, (3), (20) they are the soft magnetism iron core, (4), (19) are magnet exciting coil, (5), (17) be retracting spring, (6) are armature, (7) are insulated tension pole, (9), (15) are lug plate, (10), (14) be fixed contact, (11), (13) are moving contact, (12) are the contact cross-arm.

By accompanying drawing as can be seen: the utility model mainly is made up of permanent magnet (2), soft magnetism iron core (3), (20), magnet exciting coil (4), (19), retracting spring (5), (17), armature (6), insulated tension pole (7), fixed contact (10), (14), moving contact (11), (13) etc., its design feature is: two magnetic poles of permanent magnet (2) contact soft magnetism iron core (3), (20) respectively, are wound with magnet exciting coil (4), (19) on soft magnetism iron core (3), (20) respectively.

In structure shown in the drawings, shell (1), (8), (16), (18) are as a whole, can adopt bakelite or other insulating material to make.Permanent magnet (2) is fixed on the shell.Permanent magnet (2) be shaped as cylinder, can be cuboid, also can be Cylinder or other cylinder.Permanent magnet (2) adopts the Al-Ni-Co permanent magnet material to make, and also can adopt other permanent-magnet alloy such as Rare-Earth Cobalt to make.Because permanent magnetic ferrites has lot of advantages, so also can allow permanent magnet (2) adopt the ferrite permanent magnetic material to make (as adopting the permanent magnetic ferrites of barium or other permanent magnetic ferrites).Soft magnetism iron core (3), (20) directly are fixed on the shell, and keep large-area good the contact with two magnetic poles of permanent magnet (2) respectively.Make with electromagnetic pure iron (as models such as DT4, DT6) soft magnetism iron core (3), (20), and also available other soft magnetic material is made.It is shaped as cuboid or other shape.On the bobbin of being made by bakelite or other material, bobbin is separately fixed on soft magnetism iron core (3), (20) respectively for magnet exciting coil (4), (19).Because magnet exciting coil only short-term in the time by electric current, so needn't consider heat dissipation problem, and should consider how to guarantee the needs of enough effective magnetomotive force when satisfying the contactor starting emphatically.During coiling can with high strength enamelled wire directly repeatedly around.Magnet exciting coil (4), (19) be series connection mutually, and its a pair of end of the same name is connected during series connection, another to end of the same name respectively as the lead-in wire of exciting current.Perhaps allow magnet exciting coil (4), (19) parallel connection, and end, the head end of head end, terminal correspondence respectively and magnet exciting coil (19) of magnet exciting coil (4) links to each other when in parallel.Make with spring steel retracting spring (5), (17), and also available other elastomeric material is made.Armature (6) is " U " shape or other shape, and available electromagnetic pure iron or other soft magnetic material are made.Armature (6) with soft magnetism iron core (3), each relative end face of (20) should be smooth, the polishing of the most handy grinding machine, it asks that the crack generally is controlled in 3～10 millimeters scopes.Insulated tension pole (7) is fixed on the armature (6), and available bakelite or other insulating material are made, and should guarantee enough mechanical strengths.The design principle of the contact system that lug plate (9), (15), fixed contact (10), (14), moving contact (11), (13), contact cross-arm (12) etc. are formed is the same with common contactor, should design according to rated voltage and rated current, and consider to add the lonely device that goes out.Because the design of probe of contactor system all has detailed narration on many books, so repeat no more here.

The utility model mainly is to increase during superposition in the same way according to magnetic flux, oppositely the principle design that reduces during superposition.

Below in conjunction with accompanying drawing operation principle of the present utility model being done one specifically describes.

When contactor is not worked, because between the end face of armature (6) and soft magnetism iron core (3), (20) one section air gap is arranged, so permanent magnet (2) is less to the magnetic force of armature (6) by soft magnetism iron core (3), (20), can not make their adhesives.In the time of starting contactor, the start button that need press in the external circuits feeds the direct current of a short time for magnet exciting coil (4), (19), the flow direction of this electric current should make the direction of the magnetic line of force that magnet exciting coil (4), (19) produce, and the direction with the magnetic line of force of permanent magnet (2) in soft magnetism iron core (3), (20) is identical respectively, at this moment the magnetic flux in the air gap increases because of superposition in the same way, make magnetic force that armature (6) is subjected to elastic force, thereby make armature (6) and soft magnetism iron core (3), (20) adhesive greater than retracting spring (5), (17).While contact cross-arm (12) is insulated pull bar (7) and leaves behind, and moving contact (11), (13) are contacted with fixed contact (10), (14) respectively, thereby controlled main circuit is connected.After above-mentioned starting process was finished, though start button disconnects, magnet exciting coil (4), (19) lost electric current, but because at this moment in the whole magnetic circuit air gap be zero, so the magnetic force that permanent magnet (2) produces is very big, be enough to make contactor to keep attracting state, do not consume adhesive power this moment.When needs allow contactor quit work, the knob that stops that can pressing in the external circuits is given magnet exciting coil (4), feed the direct current of current opposite in direction when (19) feeding one and starting, this electric current is in magnet exciting coil (4), (19) magnetic line of force that produces in just in time respectively and permanent magnet (2) in soft magnetism iron core (3), the direction of the magnetic line of force (20) is opposite, thereby armature (6) and soft magnetism iron core (3), (20) magnetic flux in the adhesive face reduces because of reverse superposition, make magnetic force that armature (6) is subjected to less than retracting spring (5), (17) elastic force, the result is armature (6) and soft magnetism iron core (3), (20) separate, recover original air gap, thereby make, fixed contact separately disconnects controlled main circuit.

The utility model can be designed to A.C. contactor, also can be designed to D.C. contactor.When using in alternating current circuit, the rectifier diode of can directly connecting with knob is a Rectified alternating current with AC rectification, so that the DC excitation electric current to be provided.

Claims (6)

1, a kind of energy-saving contactor of mainly forming with permanent magnet maintenance adhesive by permanent magnet [2], soft magnetism iron core [3], [20], magnet exciting coil [4], [19], retracting spring [5], [17], armature [6], insulated tension pole [7], fixed contact [10], [14], moving contact [11], [13] etc., two magnetic poles that it is characterized in that said permanent magnet [2] contact soft magnetism iron core [3], [20] respectively, are wound with magnet exciting coil [4], [19] on soft magnetism iron core [3], [20] respectively.

2, keep the energy-saving contactor of adhesive according to claim 1 is said with permanent magnet, it is characterized in that the cylinder that is shaped as of said permanent magnet (2).

3, keep the energy-saving contactor of adhesive according to claim 1 is said with permanent magnet, it is characterized in that said permanent magnet (2) adopts the Al-Ni-Co permanent magnet material to make.

4, keep the energy-saving contactor of adhesive according to claim 1 is said with permanent magnet, it is characterized in that said permanent magnet (2) adopts the ferrite permanent magnetic material to make.

5, according to the said energy-saving contactor that keeps adhesive with permanent magnet of claim 1, it is characterized in that said magnet exciting coil (4), (19) series connection mutually, and when series connection, its a pair of end of the same name was connected, another to end of the same name respectively as the lead-in wire of exciting current.

6, according to the said energy-saving contactor that keeps adhesive with permanent magnet of claim 1, it is characterized in that said magnet exciting coil (4), (19) parallel connection, and end, the head end of head end, terminal correspondence respectively and magnet exciting coil (19) of magnet exciting coil (4) links to each other when in parallel.