CN201307569Y

CN201307569Y - Breaker auxiliary switch

Info

Publication number: CN201307569Y
Application number: CNU2008202155242U
Authority: CN
Inventors: 顾建青; 王云峰; 刘洪武; 管瑞良
Original assignee: Changshu Switchgear Manufacturing Co Ltd
Current assignee: Changshu Switchgear Manufacturing Co Ltd
Priority date: 2008-12-05
Filing date: 2008-12-05
Publication date: 2009-09-09
Anticipated expiration: 2018-12-05

Abstract

The utility model relates to a breaker auxiliary switch, which belongs to the technical field of low voltage apparatus accessory. The breaker auxiliary switch comprises a pair of mutually matched casings, a microswitch arranged in the cavity of the casings and a driving piece also arranged in the cavity of the casings, and a first contact arm for actuating the contact pin of the microswitch and a second contact arm exposed out of the casings and used for actuating the breaker operation mechanism are formed on the driving piece. The breaker auxiliary switch is characterized in that a first working surface and a second working surface which are used for continuously triggering the contact pin of the microswitch are formed on the first contact arm, wherein the first working surface is formed on the upper end surface of the first contact arm, and the second working surface is formed on the top end surface thereof. The breaker auxiliary switch has the advantages that the switch is favorable for prolonging the service life of the microswitch; the action reliability and safety of the microswitch can be improved, and finally the reliability of the auxiliary switch can be guaranteed; the structure of the switch is simple, and the assembly is easy.

Description

Auxiliary switch for circuit breaker

Technical field

The utility model belongs to low-voltage electrical apparatus attachment technique field, is specifically related to a kind of auxiliary switch for circuit breaker.

Background technology

The inner outfit auxiliary switch that needs usually of circuit breaker, the effect of auxiliary switch is the action of response circuit breaker operation mechanism, changes the on off operating mode of self, so that the electric index signal of breaker operator state to be provided.

In aforesaid auxiliary switch, generally include at least one sensitive switch, but sensitive switch has the push rod of an elastic reset, when being subjected to external force, push rod does the time spent when promptly being urged, the on off operating mode of sensitive switch changes, and after removing external force, push rod resets, automatically eject, the break-make of sensitive switch returns to reset mode simultaneously.

Except that sensitive switch, also include spring and driving member usually in the auxiliary switch, sensitive switch and spring and driving member together are installed in the housing.In the process of circuit-breaker status conversion, there is such stage at least, promptly an end of driving member contacts with circuit breaker operation mechanism, and the other end of driving member contacts with the push rod of sensitive switch (also claiming haptic element).As seen, the effect of driving member is with the Motion Transmission of the circuit breaker operation mechanism push rod to sensitive switch, thereby changes the on off operating mode of sensitive switch, provides electric indication for the mode of operation of circuit breaker changes.Aforesaid spring is located on the driving member, and its effect is when reset of breaker, makes driving member also return to reset position.

Because during breaker operator; the displacement range of the operating mechanism of circuit breaker is usually greater than the scope of activities of sensitive switch push rod; and because mismachining tolerance and fit-up gap are inevitable; in order to guarantee that auxiliary switch can correctly respond the variation of breaker operator state; the operational motion that can prevent circuit breaker does not again damage sensitive switch and driving member, also needs to design certain overshoot stroke usually.So-called overshoot stroke, be meant in the operating process of circuit breaker, after the process that the on off operating mode of guaranteeing sensitive switch changes, though can ordering about driving member, the moving component of operating mechanism continues motion, but driving member will no longer drive the push rod of sensitive switch continues motion, perhaps make the amount of exercise of push rod of sensitive switch very little, with the scope of activities of the push rod of avoiding exceeding sensitive switch and both undermined sensitive switch and undermine driving member.

Prior art makes sensitive switch realize the technical scheme announcement of the way of overshoot stroke by the auxiliary contact of the disclosed circuit breaker of utility model patent Granted publication CN2531521Y.Specifically ask for an interview Fig. 3, under the reset mode of sensitive switch 7, active force by spring 6 makes the contact 9 (being haptic element) that driving member 8 presses sensitive switch make the contact 9 of sensitive switch 7 be in the pushing state that is subjected to, that is, the pushing state that is subjected to of contact 9 is set to the reset mode of auxiliary switch.When the breaker operator state changes, driving member 8 is removed the pushing state to contact 9 gradually under the drive of circuit breaker operation mechanism, contact 9 dependence self elasticity ejects fully, changes the state of sensitive switch 7, and the electric index signal of circuit breaker mode of operation outwards is provided.

The existing deficiency of the auxiliary switch for circuit breaker of said structure is: the push rod of sensitive switch is in the state of being urged for a long time, and internal stress is bigger, to exerting an influence in useful life of sensitive switch; Owing to need overcome the elastic reset power of sensitive switch push rod by means of spring, thereby cause the housing of auxiliary switch for circuit breaker and driving member stressed big, correspondingly require harsh to structural strength, and, thereby all can cause adverse effect to processing cost, useful life and reliability because the strain of member is bigger.

China utility model patent Granted publication CN2308959Y discloses a kind of auxiliary contact of circuit breaker, its structure is: slidely connect push rod in pedestal is the housing said of front, the sidepiece of this push rod has breach, sensitive switch contact on the sensitive switch is located in the described breach, this breach is provided with the inclined-plane, one end of described push rod is exposed to outside the pedestal, is provided with back-moving spring between push rod and the pedestal.The sensitive switch contact is the sensitive switch haptic element, makes the haptic element of sensitive switch be in the state of ejecting under reset mode by back-moving spring, has solved the problems referred to above, but structure is comparatively complicated.

Summary of the invention

It is a kind of under sensitive switch is in reset mode that task of the present utility model is to provide, and avoids driving member to continue useful life and auxiliary switch for circuit breaker reliable in action, simple in structure that ensures sensitive switch used in the push rod pushing of sensitive switch.

Task of the present utility model is finished like this, a kind of auxiliary switch for circuit breaker, comprise a pair of housing that is fitted to each other, be located at the sensitive switch in the shell chamber of housing and similarly be located at driving member in the shell chamber of housing, constitute first contact arm of the haptic element that is used to activate described sensitive switch on the described driving member and constitute and be stuck in described housing and be used for second contact arm that activates for circuit breaker operation mechanism outward, be characterised in that and constitute first of the haptic element that is used for touching continuously described sensitive switch on described first contact arm, second working face, wherein, first working face is formed on the upper surface of first contact arm, and second working face is formed on the top end face of first contact arm.

In a specific embodiment of the present utility model, described first working face is inclined-plane or curved surface, and described second working face is a curved surface, and second working face is connected with first working face.

In another specific embodiment of the present utility model, described first working face is a curved surface, and the curvature of the curved surface of ratio of curvature second working face of the curved surface of first working face is little.

Go back in the specific embodiment of the present utility model, be provided with first locating shaft in the shell chamber of described housing, described sensitive switch is fixed with the middle part of first locating shaft in the shell chamber of described housing, and an end of first locating shaft and one of them housing in the pair of shells are fixed, and the other end of first locating shaft and another housing in the pair of shells are fixed.

In another specific embodiment of the present utility model, offer on the described sensitive switch and be used for the sensitive switch location hole that passes for described first locating shaft.

In another specific embodiment of the present utility model, the quantity of described first locating shaft is one or a pair of, and the quantity of described sensitive switch location hole is with the quantity of first locating shaft corresponding one or a pair of.

More of the present utility model and in specific embodiment, be provided with second locating shaft in the shell chamber of described housing, offer an axially extending bore on the described driving member, driving member is placed on the middle part of described second locating shaft by this axially extending bore, and an end of second locating shaft and one of them housing in the described pair of shells are fixed, and another housing in the other end and the pair of shells is fixed.

In of the present utility model and then specific embodiment, respectively constitute a boss in the described pair of shells, the upper surface of boss is corresponding with the lower surface of described first contact arm, and the lower surface of boss is corresponding with the contact arm upper surface of described second contact arm.

Of the present utility model again more and in specific embodiment, respectively offer a mortise on the shell wall of described pair of shells length direction, and respectively extended a tenon on another shell wall of length direction, the mortise on the two housings and the direction of tenon are opposite.

In again of the present utility model and then specific embodiment, there is displacement between the center line of the direction of motion of the haptic element of described sensitive switch and the center of rotation of driving member.

The technical scheme advantage that the utility model is recommended is: one, and when sensitive switch was in reset mode, the haptic element of sensitive switch was in free state and is not pressed by driving member, helped protecting the useful life of sensitive switch; They are two years old, haptic element with respect to sensitive switch, first surface on first contact arm of driving member shows as the impulse stroke that activates haptic element, second curved surface is then for activating the overshoot stroke of haptic element, thereby in the mechanism of first surface and haptic element, the less change in displacement of driving member can cause the big change in displacement of first contact arm, it is the displacement susceptibility height of haptic element, and in second curved surface and the haptic element mechanism, the displacement of driving member can not change the displacement of haptic element basically, the susceptibility of change in displacement that is haptic element is low, therefore can improve the reliable in action and the fail safe of sensitive switch, and the reliability of auxiliary switch is ensured; Its three, the elastic reset power of the haptic element that the resetting of driving member relies on sensitive switch realizes, thereby need not to add and be used to parts that driving member is resetted, make that construction of switch is succinct, assembling easily.

Description of drawings

Fig. 1 is a specific embodiment structure chart of the utility model auxiliary switch for circuit breaker.

Fig. 2 is the cutaway view of Fig. 1.

Fig. 3 is the structure chart of the auxiliary switch for circuit breaker in the prior art.

Embodiment

Ask for an interview Fig. 1, the auxiliary switch for circuit breaker that present embodiment is recommended comprises: the housing 1 of a pair of interworking each other, be located at the sensitive switch 2 in the shell chamber 11 of housing 1 and similarly be located at driving member 3 in the shell chamber 11 of housing 1.Be not subjected to the restriction of shape shown for the concrete shape of pair of shells 1, the bottom of pair of shells 1 is an opening, does not promptly seal.Offer mortise 13 on a wall body of pair of shells 1 length direction separately, constitute tenon 14 on another wall body of length direction, mortise 13 described here is essentially embedded hole, and described tenon 14 is essentially the embedding pin.The opposite notion of direction of mortise 13 on the two housings 1 that the applicant is said in front and tenon 14 is meant that the position of the mortise 13 on the pair of shells 1 is reciprocal, and the position of tenon 14 also is opposite, can realize interworking between them, promptly tenon 14 tenons on the housing 1 on housing 1 left side for example shown in Figure 1 are gone in the mortise 13 to the housing 1 on the right, in like manner, tenon 14 tenons on the housing 1 on the right are gone in the mortise 13 to the housing 1 on the left side, thereby realize that cooperatively interacting of pair of shells 1 constitutes a complete housing, and constitute shell chamber 11 jointly by pair of shells 1.The applicant need to prove, the direction of aforesaid mortise 13 and tenon is as a kind of concrete execution mode on the contrary, because other form also can make pair of shells 1 fixed to one another fully, for example: on one of them housing 1 of pair of shells 1, only offer mortise 13, pure formation tenon 14 on another housing 1 can make pair of shells 1 fixing too.So, can not limit the fixed form to housing 1 of the present utility model with the description of embodiment.

Three sensitive switches 2 and two driving members 3 have been provided among the figure, on the body of each sensitive switch 2, respectively offer the sensitive switch location hole 22 that the position is consistent, sensitive switch 2 is fixed in the middle part of a pair of first locating shaft 4 by sensitive switch location hole 22, and an end (left end) of a pair of first locating shaft 4 is fixing with a housing 1 on the left side, and the other end of a pair of first locating shaft 4 (right-hand member) is fixing with a housing 1 on the right.In the present embodiment, selected the situation that be arranged of a pair of first locating shaft 4 on same horizontal plane, yet it is parallel also can be the diagonal angle, when a pair of first locating shaft 4 is parastate ground, diagonal angle and pair of shells 1 fixedly the time, is opened in sensitive switch location hole 22 on the sensitive switch 2 so and also is the diagonal angle and distributes.In addition, first locating shaft 4 might not need two, also can use one, as long as can satisfy the positioning requirements of sensitive switch 2.As shown in the above description, sensitive switch 2 is being shouldered by first locating shaft 4, and more particularly, sensitive switch 2 is that carrier is suspended in 1 common shell chamber 11 that constitutes of pair of shells with first locating shaft 4.Two driving members 3 similarly are located in the shell chamber 11, specifically: on each driving member 3, offer axially extending bore 33, driving member 3 is nested with the middle part of second locating shaft 5 by means of axially extending bore 33, one end of second locating shaft 5 is that the housing on the illustrated left end and the left side is fixed, and that the other end of second locating shaft 5 is the housing 1 on illustrated right-hand member and the right is fixing.The applicant has explained three sensitive switches 2 in front, although therefore provided two driving members 3, but be to constitute a pair of on the driving member 3 on the right of shown position state or claim the first dual contact arm 31 on the driving member 3 therein, constitute one first contact arm 31 and extend on the driving member 3 on the left side, three first contact arms 31 act on the haptic element 21 of three sensitive switches 2 respectively, extended second contact arm 32 is stretched over and promptly is stuck in shell chamber 11 on each driving member 3, more particularly be stretched over outside the lower plane of housing 1, the operating mechanism of using for circuit breaker activates.Because the direction of first,

second contact arm

31,32 on driving member 3 is tending towards opposite, therefore when the direction of being illustrated by arrow in by Fig. 2 when the moving component of the operating mechanism of circuit breaker specifically when the operating mechanism of circuit breaker activated second contact arm 32, first contact arm 31 just acted on the haptic element 21 of sensitive switch 2 so.

Ask for an interview Fig. 2 and continuation in conjunction with Fig. 1, constitute first, second working face 311,312 on first contact arm 31 of the driving member 3 that the utility model is recommended, in the present embodiment, select first working face 311 to be curved surface, second working face 312 must be a curved surface, because second working face 312 is connected with first working face 311, therefore be configured for touching continuously the continuous face of the haptic element 21 of sensitive switch 2 jointly by first, second working face 311,312, but the curvature each other between first, second working face 311,312 is different.Second working face 312 above-mentioned is meant with the notion that first working face 311 is connected mutually: the terminal point of first working face 311 (end point) is the starting point of second working face 312; The different notion of the top curvature of saying is meant: the curvature of ratio of curvature second working face 312 of first working face 311 is little, thereby make in win working face 311 and haptic element 21 mechanisms, the less change in displacement of driving member 3 can cause the change in displacement that haptic element 21 is bigger.Be the change in displacement susceptibility height of haptic element 21, and in second working face 312 and haptic element 21 mechanisms, the change in displacement of driving member 3 can not change the displacement of haptic element 21 substantially, promptly the change in displacement susceptibility of haptic element 21 is low.Top first working face of saying 311 is formed on the upper surface of first contact arm 31, and second contact arm of being said 312 is formed on the top end face of first contact arm 31.The notion of described upper surface for haptic element 21, i.e. 31 those surfaces of first contact arm towards haptic element 21; The notion of described top end face is meant first working face 311 of first contact arm 31 and that face between the lower surface 313.Description by the front as can be known, first working face 311 is being taken on the task of the impulse stroke of the haptic element 21 that acts on sensitive switch 2, be that the less variation of driving member 3 displacements can cause the bigger variation of haptic element 21 displacements in haptic element 21 mechanisms of first working face 311 and sensitive switch 2 of first contact arm 31 of aforesaid driving member 3; Second working face 312 then plays a part to act on the overshoot stroke of the haptic element 21 of sensitive switch 2, be that the action displacement of driving member 3 does not change the displacement of haptic element 21 substantially in the mechanism of second working face 312 and the haptic element 21 of sensitive switch of first contact arm 31 of driving member 3.

Still see Fig. 2 and still in conjunction with Fig. 1, the inwall of a side of the length direction of pair of shells 1 and on the lower side portion respectively constitute global shape and be preferably trapezoidal boss 12, pair of projections 12 is used for matching with a pair of driving member 3, specifically: the 313 corresponding and effects mutually of the upper surface 121 of boss 12 and the lower surface of first contact arm 31, and the contact arm upper surface 321 of the lower surface 122 of boss 12 and second contact arm 32 is corresponding and act on mutually.For the version of illustrated boss 12 and in conjunction with the explanation above the applicant, as can be known, the effect of boss 12 is to carry out spacing to the motion of driving member 3, when the lower surface 313 of first contact arm 31 contacts with the upper surface 121 of boss 12, the clockwise motion of then whole driving member 3 reaches the limit of, otherwise when the lower surface 122 of the contact arm upper surface 321 of second contact arm 32 and boss 12 was inconsistent, the counterclockwise motion of then whole driving member 3 reached the limit of.In the present embodiment, although having exemplified the global shape of boss 12, the applicant is trapezoidal, but do not repel other shape, for example the hemisphere face shape also is fine, as long as make wherein two faces in three faces of hemisphere face body be able to cooperate with driving member 3, that is: upper surface 121 is cooperated with lower surface 313, lower surface 122 is cooperated with contact arm upper surface 321.In addition, aforesaid boss 12 also can be reduced to one, is formed in appointing of pair of shells 1 to select in the shell chamber of a housing 1.

The applicant is described below the course of work of the utility model auxiliary switch for circuit breaker, circuit breaker changes state (circuit breaker main contact closure, the conversion of open mode), circuit breaker operation mechanism drives second contact arm 32 of driving member 3, driving member 3 rotates counterclockwise around second locating shaft 5, and first, second working face 311,312 of first contact arm 31 contacts with the haptic element 21 of sensitive switch 2 respectively.At first, in the impulse stroke stage, first working face 311 of driving member 3 contacts with the haptic element 21 of sensitive switch 2, makes upwards action of haptic element 21, changes the on off operating mode (former normally opened contact closure, former normally-closed contact is opened) of sensitive switch 2, haptic element 21 displacement of finishing the work.Driving member 3 continues to rotate counterclockwise around second locating shaft 5, enters the overshoot stroke stage, and second working face 312 of first contact arm 31 of driving member 3 contacts with the haptic element 21 of sensitive switch 2.Haptic element 21 produces little vast displacement that makes progress, here alleged little vast displacement is meant very little displacement, contact arm upper surface 321 until second contact arm 32 contacts with the lower surface 122 of boss 12, the rotation of driving member 3 is carried out spacing, has avoided the damage of sensitive switch 2.After the haptic element 21 of sensitive switch 2 was subjected to the pushing of driving member 3, haptic element 21 had elastic reset power, and this elastic reset force reaction is in driving member 3.Exist the notion of a displacement L to be meant between the center line of the direction of motion of the haptic element 21 of the sensitive switch 2 that the applicant is said in front and the center of rotation of driving member 3: distance from the center of rotation of driving member 3 to the existing straight line of movement locus of the haptic element 21 of sensitive switch 2, the distance of this straight line is displacement L (as shown in Figure 2), therefore the center of rotation of driving member 3 has produced a reverse moment of resistance, so, when circuit-breaker status resets, circuit breaker operation mechanism no longer has active force to first contact arm 31 of driving member 3, makes driving member 3 clockwise rotate the realization reliable reset under the effect of the reverse moment of resistance.Effect by the lower surface 313 of 121 pairs first contact arms 31 of upper surface of boss 12 promptly contacts with the upper surface 121 of boss 12 until the lower surface 313 of contact arm 31, resetting of driving member 3 is rotated carry out spacingly, has avoided the damage of sensitive switch 2.Therefore, the driving member 3 of the utility model auxiliary switch for circuit breaker resets not need to resemble and helps by spring the prior art.

Though above-mentionedly described the utility model according to preferred embodiment; but those skilled in the art are appreciated that; at some embodiment that on the basis of spirit of the present utility model or intrinsic propesties, can extensively not extend to other; therefore; the foregoing description is not limited by any details described above, any on this feature base change or revise within the utility model scope of patent protection.

Claims

1, a kind of auxiliary switch for circuit breaker, comprise a pair of housing that is fitted to each other (1), be located at the sensitive switch (2) in the shell chamber (11) of housing (1) and similarly be located at driving member (3) in the shell chamber (11) of housing (1), constitute first contact arm (31) of the haptic element (21) that is used to activate described sensitive switch (2) on the described driving member (3) and constitute and be stuck in outer second contact arm (32) that is used for for the circuit breaker operation mechanism actuating of described housing (1), it is characterized in that constituting on described first contact arm (31) first of the haptic element (21) that is used for touching continuously described sensitive switch (2), second working face (311,312), wherein, first working face (311) is formed on the upper surface of first contact arm (31), and second working face (312) is formed on the top end face of first contact arm (31).

2, auxiliary switch for circuit breaker according to claim 1, it is characterized in that described first working face (311) is inclined-plane or curved surface, and described second working face (312) is a curved surface, and second working face (312) is connected with first working face (311).

3, auxiliary switch for circuit breaker according to claim 2 it is characterized in that described first working face (311) is a curved surface, and the curvature of the curved surface of ratio of curvature second working face (312) of the curved surface of first working face (311) is little.

4, auxiliary switch for circuit breaker according to claim 1, it is characterized in that being provided with first locating shaft (4) in the shell chamber (11) of described housing (1), described sensitive switch (2) is fixed with the middle part of first locating shaft (4) in the shell chamber (11) of described housing (1), and one of them housing (1) in an end of first locating shaft (4) and the pair of shells (1) is fixing, and another housing (1) in the other end of first locating shaft (4) and the pair of shells (1) is fixing.

5, auxiliary switch for circuit breaker according to claim 4 is characterized in that offering on the described sensitive switch (2) and is used for for the sensitive switch location hole (22) that passes of described first locating shaft (4).

6, auxiliary switch for circuit breaker according to claim 5, the quantity that it is characterized in that described first locating shaft (4) is one or a pair of, and the quantity of described sensitive switch location hole (22) is with the quantity of first locating shaft (4) corresponding one or a pair of.

7, auxiliary switch for circuit breaker according to claim 1, it is characterized in that being provided with second locating shaft (5) in the shell chamber (11) of described housing (1), offer an axially extending bore (33) on the described driving member (3), driving member (3) is placed on the middle part of described second locating shaft (5) by this axially extending bore (33), and one of them housing (1) in an end of second locating shaft (5) and the described pair of shells (1) is fixing, and another housing (1) in the other end and the pair of shells (1) is fixing.

8, auxiliary switch for circuit breaker according to claim 1, it is characterized in that respectively constituting in the described pair of shells (1) boss (12), the upper surface (121) of boss (12) is corresponding with the lower surface (313) of described first contact arm (31), and the lower surface (122) of boss (12) is corresponding with the contact arm upper surface (321) of described second contact arm (32).

9, according to claim 1 or 4 or 7 or 8 described auxiliary switch for circuit breaker, it is characterized in that respectively offering a mortise (13) on the shell wall of described pair of shells (1) length direction, and respectively having extended a tenon (14) on another shell wall of length direction, the mortise (13) on the two housings (1) and the direction of tenon (14) are opposite.

10. auxiliary switch for circuit breaker as claimed in claim 1 is characterized in that having displacement (L) between the center of rotation of the center line of the direction of motion of haptic element (21) of described sensitive switch (2) and driving member (3).