CN1282209C

CN1282209C - Air circuit breaker

Info

Publication number: CN1282209C
Application number: CNB028273176A
Authority: CN
Inventors: 若林秀哉
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-12-09
Filing date: 2002-12-09
Publication date: 2006-10-25
Anticipated expiration: 2022-12-09
Also published as: JPWO2004053911A1; WO2004053911A1; CN1615532A; TW579533B; TW200410278A; JP4134987B2; KR20040091710A; KR100641863B1

Abstract

The present invention relates to an air circuit breaker. The air circuit breaker causes a switch-in spring which is switched into the air circuit breaker through the release of accumulated pressure to be miniaturized, the overlarge load of stress is prevented, and the service life of the mechanical strength of the switch-in spring is extended. Besides, the impact force of the spring is reduced when the spring is switched in, and the incorrect tripping is prevented. The present invention is composed of a switching mechanism (10), the switch-in spring (12) and a pressure spring (18), wherein the switching mechanism is composed of a toggle rod mechanism which causes a mobile element (3) to swing to be opened and closed and causes connecting points to be switched on and cut off; the switch-in spring is used for pressing a connecting rod joint in the toggle rod mechanism by utilizing the release of the accumulated pressure to cause the mobile element (3) to be switched on to move; the pressure spring can be used for applying force to the mobile element (3) in a leaving direction in the state of the cutting off and applying contact pressure between the two connecting points in the state of the switching on. The pressure spring (18) is composed of a non-linear spring. Besides, the switch-in spring (12) also is a non-linear spring; therefore, the switch-in can be reduced, and the incorrect tripping can be prevented.

Description

Air circuit

Technical field

The present invention has illustrated the open and close mechanism of air circuit, is air circuit by means of the release force of pressure accumulation spring about the access of circuit breaker especially.

Background technology

Fig. 6 is the side cut away view of traditional air circuit of being put down in writing of Japanese kokai publication hei 3-201334 communique.

In the figure, basket 1 is formed by insulating material, and fixed conductor 2 is installed on the inner bottom part of basket 1.Fixed contact 2a is fixed in an end of this fixed conductor 2, and the other end of this fixed conductor 2 is derived and formation power supply side terminal 2b to the outer back of basket 1.On moving element 3, be fixed with movable contact 3a, make travelling contact 3a separate or be connected with fixed contact 2a by rotation moving element 3.

Moving element 3 is movably supported by contact lever 4, and contact lever 4 is supported by the contact lever axle 5 that is fixed on the basket 1.Moving element 3 by fexible conductor 6 with terminal conductor 7 conductings and flexibly connect.Terminal conductor 7 is derived and formation power supply side terminal 7a to the outer back of fixing basket 1.And moving element 3 is received pressure to departure direction from holddown spring 8.Then, contact lever 4 is connected with the switching mechanism 10 that known toggle link (toggle link) mechanism constitutes by axle 9.Then, axle 9 can be swung and support moving element 3.

Switching mechanism 10 makes moving element 3 rotations, and travelling contact 3a is connected or separates with fixed contact 2a, thereby makes that the energising of air circuit is conducting or disconnection.

Under common conducting state, switching mechanism 10 hooks with tripping relay (tripping relay) 11 latches that engage (not having diagram) and keeps conducting state.But, when tripping relay 11 is checked out the super-high-current that overcurrent or accident etc. cause, the bond-off of latch then, switching mechanism 10 is done and is disconnected action.

Disconnect power and the electromagnetic force of the driving of action, insert action and then undertaken by the release of the pressure accumulation power that inserts spring 12 from holddown spring 8.Insert spring 12 by handle 13 or not shown motor, be compressed and obtain pressure accumulation by the pressure accumulater of eccentric mechanism 14.

The access of air circuit is necessary to compress to moving element 3 to the holddown spring 8 and the mobile moving element 3 that deviate from the direction reinforcing, makes travelling contact 3a touch fixed contact 2a.Because holddown spring 8 adopts the common disc spring of equidistantly reeling, so the reaction force of the amount of movement of spring terminal and generation is proportional relation.The moving element 3 of released state rests on the position after holddown spring 8 compresses a little, and the action initial stage of inserting compression needs thrust to a certain degree.

Each connecting rod (link) that inserts the toggle link at action initial stage is in case of bending, inserts in the elastic force that spring 12 discharges, little to the component of necessary direction for making moving element 3 move to conducting state.Therefore, for guaranteeing the thrust at the initial stage of moving, make access spring 12 big and strong.Again,, insert spring 12 and must be arranged in the limited space,, have the problem of the mechanical strength lost of life so cause access spring 12 mechanical loads of miniaturization excessive because will make the air circuit miniaturization.

Again, after the conducting of contact was finished, guide hole 16 ends that access spring 12 bullets are put into because of colliding spring tuck 15 finished.If make access spring 12 powerful, the impulsive force of this moment is all vibrated the mechanism that comprises basket 1, and the hook of the latch that engages with tripping relay unit 11 (not having diagram) is thrown off, and generation can't make contact reach the mistrip problem of conducting state.

The present invention is in order to address the above problem, its purpose is, by making the access spring miniaturization that inserts the action force source, alleviating the stress load, reach mechanism's life-span long term stabilization, and at the contact pressure of passing through after the contact conducting between the holddown spring retaining contact, the air circuit of the high reliability of the electrical characteristic when being met energising.

Summary of the invention

Air circuit of the present invention has: switching mechanism, by the swing open and close with the moving element of travelling contact and make travelling contact and fixed contact between realize that the elbow-bar mechanism of conducting, disconnection constitutes; Insert spring, compress the carrier bar of this elbow-bar mechanism, make to move to conducting state by release force; To inserting the pressure accumulater that spring carries out pressure accumulation; Under off-state, give the holddown spring that nonlinear spring constituted of travelling contact to the departure direction reinforcing, under conducting state from fixed contact to the contact pressure of fixed contact to moving element.Moreover inserting spring also is nonlinear spring.

Description of drawings

Fig. 1 is the side cut away view of air circuit of the present invention.

Fig. 2 is the end view of non-linear holddown spring of the present invention.

Fig. 3 is access spring and the power of holddown spring and the graph of a relation of stroke of the invention process form 1.

Fig. 4 is the key position side cut away view of explanation air circuit.

Fig. 5 is access spring and the power of holddown spring and the graph of a relation of stroke of the invention process form 2.

Fig. 6 is the side cut away view of air circuit in the past.

Embodiment

Example 1

With reference to Fig. 1～Fig. 4 example 1 of the present invention is described.

Among the figure, 1～7,9～16 installed identically with above-mentioned in the past, and it illustrates omission.As shown in Figure 2, holddown spring 18 is made nonlinear spring, and the coiling gap is not for waiting, thus, as shown in Figure 3, the relation of compression displacement and reaction force is disproportionate, spring constant is little when the initial position S of stroke (stroke), increases to the position of stroke latter end L.

Then, the access action is described.Among Fig. 4, compression insert spring 12 installation the hook action of pressure accumulation arm 20 of spring tuck 15 when throwing off according to incoming instruction, pressure accumulation arm 20 be that the center press among the figure counter clockwise direction and rotated with axle 21, above pressure accumulation arm 20 is pressed to the upper joint 10a of toggle link.This thrust propagates into each parts of toggle link, moving element 3 is moved to conducting direction, and begin to compress holddown spring 18.

The relation of power at this moment is that such shown in the arrow among Fig. 4, the spring release force P1 that inserts spring 12 is formed the mobile moving element 3 necessary component P2 that insert into by toggle link component.This inserts into component P2 must be bigger than the total reaction force of a plurality of holddown springs 18.So, holddown spring 18 to equip side by side air circuit number of poles or with the integral multiple of number of poles, be generally 3～12.

Because holddown spring 18 is nonlinear springs, compare with holddown spring 8 in the past, can lower and insert the reaction force F of action during the initial stage.Because each reaction force that inserts spring 18 is little, and adds up to reaction force F to be several times, compare and can correspondingly lower in the past, only to this part, realize inserting spring 12 miniaturization, weaken.

Holddown spring 18 is made nonlinear spring can lower the reaction force F that inserts the action initial stage, and therefore, the mechanical load that inserts spring 12 is alleviated, thereby can the prolonged mechanical intensity life-span.

Example 2

Fig. 5 is access spring and the power of holddown spring and the graph of a relation of stroke of example 2 of the present invention.Holddown spring and access spring both sides are all nonlinear spring in the example 2.And, structure constitute with above-mentioned example 1 in Fig. 1 identical with Fig. 4, so omit its explanation.

Shown in Figure 5, are nonlinear springs because insert spring 12, so can obtain to insert beginning the time and insert desired elastic force when finishing.Then, because power is reduced in the middle of the stroke, when making access spring 12 bullets that insert action and putting, inserts the energy W that spring tuck 15 collides guide hole 16 ends when finishing and be lowered, impulsive force obtains relaxing.The hook of the latch that can prevent from like this to engage with tripping relay 11 (not having diagram) is thrown off and the mistrip that causes.

Then, reduce, so when access spring 12 passes through the motor pressure accumulation, can reduce consumption electric power because insert the reaction force F of spring 12.

And, the disc spring that the non-linear holddown spring of above-mentioned explanation and non-linear access spring adopt winding spacing not wait, yet, as long as the relation of compression displacement and reaction force is out-of-proportion, also can adopt the such nonlinear spring of bamboo spring.

The industrial possibility of utilizing

In the aforesaid air-break of the present invention, during off-state to moving element from fixed contact to Effect on the direction of leaving, give the holddown spring of pressing to the contact of fixed contact to travelling contact during conducting state and be Nonlinear spring can be realized miniaturization, alleviate mechanical load so insert the access spring of the force source of action, and is real Now insert the mechanicalness life-span long term stabilization of spring.

And, be non-linear spring owing to inserting spring, the impact energy W when access spring bullet is put the back to the access end is reduced, and has relaxed impulsive force, throws off the generation of the mistrip that causes so prevented the latch that is caused by impact.Therefore, the consumption electric power that inserts the pressure accumulation motor of spring also reduces.

Claims

1. air circuit has:

Moving element, be fixed with conductor on the travelling contact of fixing fixed contact subtend;

Switching mechanism is by making described moving element swing open and close and making above-mentioned travelling contact and the elbow-bar mechanism of the conducting of said fixing contact, disconnection constitutes;

Insert spring, compress the carrier bar of above-mentioned elbow-bar mechanism, and move above-mentioned moving element and make conducting by release force;

Pressure accumulater carries out pressure accumulation to described access spring; And

Holddown spring is given the power of leaving said fixing contact direction to above-mentioned moving element under off-state, give contact pressure to above-mentioned fixed contact to above-mentioned travelling contact under conducting state, it is characterized in that,

Above-mentioned holddown spring is a nonlinear spring.

2. air circuit as claimed in claim 1 is characterized in that,

Inserting spring is nonlinear spring.