CN202307742U

CN202307742U - Electronic overload relay

Info

Publication number: CN202307742U
Application number: CN2011204028900U
Authority: CN
Inventors: 魏秀玲; 马晓华; 钟美华; 林颖泉
Original assignee: Xiamen Shihlin Electric & Engineering Co Ltd
Current assignee: Xiamen Shihlin Electric & Engineering Co Ltd
Priority date: 2011-10-21
Filing date: 2011-10-21
Publication date: 2012-07-04
Anticipated expiration: 2021-10-21

Abstract

The utility model discloses an electric overload relay which comprises a housing, a pair of normally closed stationary contacts, a pair of normally open stationary contacts and a U-shaped magnetic yoke, wherein the U-shaped magnetic yoke is fixed at the back in the cavity of the housing; a disengaging coil and a reset coil are respectively mounted on the two side arms of the U-shaped magnetic yoke; a bracket, which is arranged in the middle of the cavity of the housing, can rotate around a fixed pivot; two magnetic yokes are fixed at the back part of the bracket; one ends of the two magnetic yokes are adhered to a permanent magnet together, and the other ends of the two magnetic yokes correspond to the end surfaces of two side arms of the U-shaped magnetic yoke; the pair of normally closed stationary contacts is arranged at the front part in the cavity of the housing and on the same side as the disengaging coil; the pair of the normally open stationary contacts is arranged at the front part in the cavity of the housing and on the same side as the reset coil; and a pair of normally closed movable contacts is arranged on one side of the front part of the bracket and matched with the pair of normally closed stationary contacts, and a pair of normally open movable contacts is arranged on the other side of the front part of the bracket and matched with the pair of the normally open stationary contacts. The electric overload relay has the advantages of simple structure, easiness in assembly, and low manufacturing cost.

Description

A kind of electronic overload relay

Technical field

The utility model relates to the low voltage electrical apparatus technology field, especially a kind of electronic overload relay.

Background technology

Overload relay is a kind of electric protective device; Link to each other with the coil of contactor and to be used for protecting the motor or the electric equipment of use; When current overload occurring in the circuit; Through the power supply of coil in the overload relay disconnection contactor, the motor in using through the contactor disconnection again or the power supply of electric equipment prevent that motor or electric equipment are damaged.

Traditional overload relay adopts the mechanical type overload relay mostly, receives temperature rise distortion break contact through elastic sheet metal, though this structure is simpler, exists protection low precision, shortcoming that loss is bigger, can not satisfy high requirement client's needs; Disclosing a patent No. on 06 23rd, 2010 is that ZL200920235696.0, name are called the utility model patent of " a kind of electronic overload relay "; It is than traditional overload relay; The protection precision is higher, power consumption is also lower, but the part that its contact mechanism and manual-operating mechanism are formed is more, and the overall package difficulty is big; Manual-operating mechanism also will be set up a release link and permanent magnet and could accomplish the dropout of overload relay and reset, and manufacturing cost is also higher.

The utility model content

The technical problem that the utility model will solve provides a kind of electronic overload relay, and is simple in structure, and assembling is easy, low cost of manufacture.

For achieving the above object; The technical scheme of the utility model is: a kind of electronic overload relay; Comprise housing, a pair of normally closed fixed contact, a pair of fixed contact, U type yoke, tripping coil, the resetting coil often opened, U type yoke is fixed on rear portion in the housing die cavity, on the side arm of U type yoke tripping coil is housed; On another side arm of U type yoke resetting coil is housed; One support can rotate along a fulcrum that is fixed on the housing in the middle of being arranged on the housing die cavity, and two yokes are fixed at the rear portion of support, and an end of two yokes is attached on the permanent magnet jointly; The other end of a yoke is corresponding with the side arm end face of the U type yoke that tripping coil is installed; The other end of another yoke is corresponding with the side arm end face of the U type yoke that resetting coil is installed, a pair of normally closed fixed contact be arranged in the housing die cavity anterior and with the tripping coil homonymy, a pair of often open fixed contact be arranged in the housing die cavity anterior and with the resetting coil homonymy; The fixing metallic elastic component of the anterior side of support; A pair of normally closed moving contact is set on the metallic elastic component matches with said a pair of normally closed fixed contact, also fixing another metallic elastic component of the anterior opposite side of support is provided with a pair of contact of often starting and matches with the said a pair of fixed contact of often opening on another metallic elastic component.

Further improve; Described housing is anterior to be equipped with a SR with the resetting coil homonymy; The end that SR stretches in the housing die cavity is installed with the spring that makes the SR return; It is corresponding with the end face of support front portion one side that SR stretches into the end face of the end in the housing die cavity, can make overload relay be in closure state through SR.

Further improve; Described support front portion is provided with spacing preiection, and the end that SR stretches into the housing die cavity circumferentially is being provided with one section arc convex, and a guide vane end stop is articulated in and is fixed on another fulcrum of housing; The torsion spring that makes the guide vane end stop return is housed on the guide vane end stop; Guide vane end stop is provided with a positive stop end and a struck side, and described positive stop end is corresponding with the spacing preiection of support front portion, and described struck side is corresponding with the circumferential arc convex of SR; Can make the circumferential arc convex of SR stir the struck side of guide vane end stop or be separated through rotating SR, can make overload relay have rotational automatic resetting or hand-reset with the struck side of guide vane end stop.

Further improve, described housing front portion is provided with an inspection hole, and the front portion of support is provided with an indication end face, and described indication end face can be corresponding with described inspection hole, can conveniently observe the operating state of overload relay through inspection hole.

Further improve; Described housing is anterior to be equipped with a stop button with the tripping coil homonymy; Stop button stretches into the interior end of housing die cavity and is installed with the spring that makes the stop button return; It is corresponding with the end face of support front portion one side that stop button stretches into the end face of an end in the housing die cavity, can make overload relay be in trip status at any time through stop button.

Further improve, described housing is made up of protecgulum and back shell, and protecgulum is stuck on the back shell, and SR and stop button are contained on the protecgulum, make things convenient for the assembling of overload relay.

The utility model is owing to fix two yokes at the rear portion of support, and an end of two yokes is attached on the permanent magnet jointly, only needs installation tripping coil and resetting coil just can constitute required magnetic circuit on the U type yoke; Whole magnetic structure is simple; Part is also less, and a pair of normally closed moving contact and a pair of contact of often starting are arranged on the metallic elastic component, utilizes metallic elastic component and support to fix also than being easier to again; Therefore overall package is convenient, and manufacturing cost is lower.

Description of drawings

Fig. 1 is the utility model front view;

Fig. 2 is the utility model stereogram;

Fig. 3 is that Fig. 1 removes back shell and is in the upward view of trip status;

Fig. 4 is that Fig. 1 removes back shell and is in the vertical view of trip status;

Fig. 5 is contained in each part three-dimensional exploded view on the support;

Fig. 6 is the SR stereo amplification figure;

Fig. 7 is the guide vane end stop stereo amplification figure;

Fig. 8 is that Fig. 1 removes back shell and is in the upward view of closure state.

Embodiment

Below in conjunction with accompanying drawing and concrete execution mode the utility model is done further explain.

Fig. 1 is to shown in Figure 7; A kind of electronic overload relay comprises housing 1, a pair of normally closed fixed contact 2, a pair of fixed contact 3, U type yoke 4, tripping coil 5, the resetting coil 6 often opened, and housing 1 is combined by protecgulum 11 and back shell 12; Protecgulum 11 is stuck on the back shell 12; U type yoke 4 is fixed on rear portion in housing 1 die cavity, on the side arm 41 of U type yoke 4 tripping coil 5 is housed, and on another side arm 42 of U type yoke 4 resetting coil 6 is housed; One support 7 can rotate along a fulcrum 121 that is fixed on the housing 1 in the middle of being arranged on housing 1 die cavity; One end of fixing 71,72, two

yokes

71,72 of two yokes in the rear portion of support 7 is attached on the permanent magnet 8 jointly, and permanent magnet 8 also is fixed on the support 7; The other end of a yoke 71 is corresponding with side arm 41 end faces of the U type yoke 4 that tripping coil 5 is installed; The other end of another yoke 72 is corresponding with side arm 42 end faces of the U type yoke 4 that resetting coil 6 is installed, a pair of normally closed fixed contact 2 be arranged in housing 1 die cavity anterior and with tripping coil 5 homonymies, a pair of often open fixed contact 3 be arranged in housing 1 die cavity anterior and with resetting coil 6 homonymies; Support 7 anterior sides are fixed a metallic elastic component 73; A pair of normally closed moving contact 731 is set on the metallic elastic component 73 matches with said a pair of normally closed fixed contact 2, also fixing another metallic elastic component 74 of support 7 anterior opposite sides is provided with a pair of contact 741 of often starting and matches with the said a pair of fixed contact 3 of often opening on another metallic elastic component 74.

With resetting coil 6 homonymies a SR 9 is housed on the protecgulum 11 of housing 1; The end that SR 9 stretches in housing 1 die cavity is installed with the spring 100 that makes SR 9 returns, and it is corresponding with the end face 75 of support 1 an anterior side that SR 9 stretches into the end face of an end in housing 1 die cavity.

Support 7 front portions are provided with spacing preiection 76; SR 9 stretches into the interior end of housing 1 die cavity one section arc convex 91 circumferentially is being set; One guide vane end stop 10 is articulated in and is fixed on housing 1 another fulcrum 122; The torsion spring 200 that makes guide vane end stop 10 returns is housed on the guide vane end stop 10, and guide vane end stop 10 is provided with a positive stop end 101 and a struck side 102, and described positive stop end 101 is corresponding with the spacing preiection 76 of support 7 front portions; Described struck side 102 is corresponding with SR 9 circumferential arc convex 91, can make SR 9 circumferential arc convex 91 stir the struck side 102 of guide vane end stop 10 or be separated with the struck side 102 of guide vane end stop 10 through rotating SR 9.

The protecgulum 11 of housing 1 is provided with an inspection hole 111, and the front portion of support 7 is provided with an indication end face 77, and described indication end face 77 can be corresponding with described inspection hole 111.

On housing 1 protecgulum 11, a stop button 13 is housed with tripping coil 5 homonymies; Stop button 13 stretches into that an end is installed with the spring 300 that makes stop button 13 returns in housing 1 die cavity, and it is corresponding with the end face 78 of support 7 anterior sides that stop button 13 stretches into the end face of an end in housing 1 die cavity.

The operation principle of the utility model is following: shown in Figure 8; Under the normal operating position; Yoke 72 keeps adhesive through the suction of permanent magnet 8 and side arm 42 end faces of U type yoke 4; A pair of normally closed fixed contact 2 and a pair of normally closed moving contact 731 closures, a pair of fixed contact 3 of often opening is thrown off with a pair of contact 741 of often starting, and this moment, overload relay was in closure state.

When rotating to the state of automatically reseting to SR 9, the struck side 102 that this moment, SR 9 circumferential arc convex 91 withstood guide vane end stop 10, position after the positive stop end 101 of guide vane end stop 10 is in; Guide vane end stop 10 is inoperative; Support 7 is free to rotate, and when the circuit board (not shown) detected current overload, circuit board can be given tripping coil 5 moments energising; Make support 7 deflections with regard to producing the suction that a suction overcomes permanent magnet 8 between side arm 41 end faces of U type yoke 4 and the yoke 71; Adhesive is again through the suction maintenance attracting state of permanent magnet 8 mutually with yoke 71 for side arm 41 end faces of U type yoke 4, and as shown in Figure 3, overload relay is in trip status; This moment, a pair of normally closed fixed contact 2 was thrown off with a pair of normally closed moving contact 731; And then break off the power supply of use equipment through outside contactor, simultaneously a pair of fixed contact 3 and a pair of contact 741 closures of often starting often opened can be seen the signal that overload relay is threaded off off through a pair of fixed contact 3 of often opening; Watch the position of the front portion indication end face 77 of support 7 can judge that also overload relay is in trip status through the inspection hole 111 of protecgulum 11.

After the fault of external equipment is got rid of; Give resetting coil 6 moments energising through the circuit board (not shown); Make support 7 deflections with regard to producing the suction that a suction overcomes permanent magnet 8 between side arm 42 end faces of U type yoke 4 and the yoke 72; Side arm 42 end faces of U type yoke 4 and yoke 72 adhesive mutually keep attracting state through the suction of permanent magnet 8 again; This moment a pair of normally closed fixed contact 2 with the adhesive again of a pair of normally closed moving contact 731, a pair of fixed contact 3 of often opening is thrown off and is recovered normal operating conditionss with a pair of contact 741 of often starting, and can see the closed signal of overload relay off through a pair of fixed contact 3 of often opening equally; Watch the position of the front portion indication end face 77 of support 7 can judge that also overload relay is in closure state through the inspection hole 111 of protecgulum 11.

When SR 9 rotates to the hand-reset state; This moment, SR 9 circumferential arc convex 91 broke away from the struck side 102 of guide vane end stop 10; The positive stop end 101 of guide vane end stop 10 is in anteposition under torsion spring 200 effects, 10 position-limiting actions of guide vane end stop make overload relay trip status occur in case overload occurs; This moment, the positive stop end 101 of guide vane end stop 10 just withstood the spacing preiection 76 of support 7 front portions; Also can't make support 7 deflections for this moment resetting coil 6 energisings, need manually push SR 9, make through SR 9 and move behind the positive stop end 101 of guide vane end stop 10 and support 7 deflections are resetted.

Through manually pushing stop button 13, can make support 7 deflections at any time, let a pair of normally closed fixed contact 2 and a pair of normally closed moving contact 731 throw off, make overload relay be in trip status.

Below only be preferred embodiment of the utility model, the change that those skilled in the art does to be equal to by claim all falls into the protection range of this case.

Claims

1. electronic overload relay; Comprise housing, a pair of normally closed fixed contact, a pair of fixed contact, U type yoke, tripping coil, the resetting coil often opened; U type yoke is fixed on rear portion in the housing die cavity; On the side arm of U type yoke tripping coil is housed, on another side arm of U type yoke resetting coil is housed, it is characterized in that: a support can rotate along a fulcrum that is fixed on the housing in the middle of being arranged on the housing die cavity; Two yokes are fixed at the rear portion of support; One end of two yokes is attached on the permanent magnet jointly, and the other end of a yoke is corresponding with the side arm end face of the U type yoke that tripping coil is installed, and the other end of another yoke is corresponding with the side arm end face of the U type yoke that resetting coil is installed; A pair of normally closed fixed contact be arranged in the housing die cavity anterior and with the tripping coil homonymy; A pair of often open fixed contact be arranged in the housing die cavity anterior and with the resetting coil homonymy, the fixing metallic elastic component of the anterior side of support is provided with a pair of normally closed moving contact and matches with said a pair of normally closed fixed contact on the metallic elastic component; Also fixing another metallic elastic component of the anterior opposite side of support is provided with a pair of contact of often starting and matches with the said a pair of fixed contact of often opening on another metallic elastic component.

2. a kind of electronic overload relay according to claim 1; It is characterized in that: described housing is anterior to be equipped with a SR with the resetting coil homonymy; The end that SR stretches in the housing die cavity is installed with the spring that makes the SR return, and it is corresponding with the end face of support front portion one side that SR stretches into the end face of the end in the housing die cavity.

3. a kind of electronic overload relay according to claim 2; It is characterized in that: described support front portion is provided with spacing preiection; The end that SR stretches into the housing die cavity circumferentially is being provided with one section arc convex, and a guide vane end stop is articulated in and is fixed on another fulcrum of housing, and the torsion spring that makes the guide vane end stop return is housed on the guide vane end stop; Guide vane end stop is provided with a positive stop end and a struck side; The anterior spacing preiection of described positive stop end and support is corresponding, and described struck side is corresponding with the circumferential arc convex of SR, can make the circumferential arc convex of SR stir the struck side of guide vane end stop or be separated with the struck side of guide vane end stop through the rotation SR.

4. a kind of electronic overload relay according to claim 1 is characterized in that: described housing front portion is provided with an inspection hole, and the front portion of support is provided with an indication end face, and described indication end face can be corresponding with described inspection hole.

5. according to each described a kind of electronic overload relay of claim 1 to 4; It is characterized in that: described housing is anterior to be equipped with a stop button with the tripping coil homonymy; Stop button stretches into that an end is installed with the spring that makes the stop button return in the housing die cavity, and it is corresponding with the end face of support front portion one side that stop button stretches into the end face of an end in the housing die cavity.

6. a kind of electronic overload relay according to claim 5 is characterized in that: described housing is made up of protecgulum and back shell, and protecgulum is stuck on the back shell, and SR and stop button are contained on the protecgulum.