CN212113572U

CN212113572U - Shielding arc-extinguishing device of contactor contact

Info

Publication number: CN212113572U
Application number: CN202020351883.1U
Authority: CN
Inventors: 张珂
Original assignee: Individual
Current assignee: Individual
Priority date: 2020-03-19
Filing date: 2020-03-19
Publication date: 2020-12-08
Anticipated expiration: 2030-03-19

Abstract

The embodiment of the application discloses a shielding arc-extinguishing device of a contactor contact, wherein the shielding arc-extinguishing device is additionally arranged in a cavity of a moving contact and a static contact of a contactor, when a line needs to normally break any load current value, the moving contact and the static contact are opened in a breaking mode, meanwhile, an insulating shielding piece in the shielding arc-extinguishing device rapidly isolates the moving contact and the static contact, electric arcs are forced to be rapidly elongated towards an arc extinguish chamber to be extinguished or enter the arc extinguish chamber to be extinguished in a cooling mode, and therefore the moving contact and the static contact of the contactor are reliably broken, arc extinguishing time is shortened, the electric arcs are rapidly extinguished, contact burning loss is reduced, the capacity of the contactor for breaking normal load current is further improved.

Description

Shielding arc-extinguishing device of contactor contact

Technical Field

The invention relates to the field of electric power, in particular to a shielding arc-extinguishing device of a contactor contact.

Background

The contactor is an important electrical element in industrial and civil low-voltage control electrical equipment, is mainly used for frequently switching on or switching off an alternating current and direct current large and small capacity control circuit, and the main control object of the contactor is a motor. The electric service life (the number of loaded operation cycles under the use condition specified by the product standard) is the main technical index, and the electric service life is related to the electric contact material, the contact pressure and the arc extinguishing performance when the moving contact and the static contact are disconnected. When the contactor breaks normal load current, plasma arcs (electric arcs are conductive) can be generated between a moving contact and a static contact of the contactor, how to quickly extinguish the electric arcs during breaking to reduce contact burning loss is a main way for prolonging the electric service life of the contactor, and the problem to be solved by the technical staff in the field is urgent.

Disclosure of Invention

In order to solve the above technical problem, an embodiment of the present application provides a shielding arc-extinguishing device for a contactor, where the shielding arc-extinguishing device is additionally installed in a cavity of a moving contact and a static contact of a contactor, and when a line needs to be normally disconnected with any load current value, the moving contact and the static contact are disconnected and opened, and simultaneously, an insulating shielding member in the shielding arc-extinguishing device rapidly isolates the moving contact and the static contact, so that an arc is rapidly elongated towards an arc-extinguishing chamber to be extinguished or enters the arc-extinguishing chamber to be cooled and extinguished, thereby realizing reliable disconnection of the moving contact and the static contact of the contactor, shortening arc-extinguishing time, rapidly extinguishing the arc, reducing burning loss of the contact when the arc is disconnected, further improving the normal load current.

The embodiment of the application provides the following technical scheme:

a shielded arc quenching device for a contactor contact, the device comprising:

the shielding arc-extinguishing device is used for rapidly isolating the moving contact and the static contact by an insulating shielding piece in the shielding arc-extinguishing device when the moving contact and the static contact of the contactor are opened in a breaking mode, so that electric arcs are forced to be rapidly elongated towards the arc-extinguishing chamber to be extinguished or enter the arc-extinguishing chamber to be cooled and extinguished, the arc-extinguishing time is shortened, the electric arcs are rapidly extinguished, the contact burning loss is reduced, and when the moving contact and the static contact of the contactor are closed, the insulating shielding piece in the shielding arc-extinguishing device is rapidly opened, so that the moving;

the shielding arc-extinguishing device is additionally arranged in a cavity of a moving contact and a static contact of the contactor.

The shielding arc-extinguishing device is also used for rapidly opening an insulating shielding piece in the shielding arc-extinguishing device when the moving contact and the static contact are closed, so that the moving contact and the static contact are reliably closed.

The contactor comprises a contactor body, a fixed contact, a movable contact and a limiting device, wherein the contactor body is provided with a cavity, the cavity is internally provided with a moving contact and a fixed contact, and the limiting device is additionally arranged in the cavity of the moving contact and the fixed contact of the contactor.

The limiting device is used for matching with the action stroke displacement of the moving contact bridge plate to drive the shielding arc-extinguishing device to act, so that the moving contact and the static contact are quickly isolated by an insulating shielding piece in the shielding arc-extinguishing device;

the shielding arc-extinguishing device is specifically used for driving the shielding arc-extinguishing device to act by utilizing the cooperation between the action stroke displacement of a bridge plate of the movable contact and the limiting device when the movable contact and the fixed contact of the contactor are opened in a breaking way, an insulating shielding piece in the shielding arc-extinguishing device rapidly isolates the movable contact and the fixed contact, so that electric arcs are rapidly elongated towards the arc-extinguishing chamber to be extinguished or enter the arc-extinguishing chamber to be quenched in a cooling way, the arc-extinguishing time is shortened, the electric arcs are rapidly extinguished, the burning loss of the contacts is reduced, and when the movable contact and the fixed contact of the contactor are closed, the insulating shielding piece in the shielding arc;

the shielding arc-extinguishing device is arranged on the moving contact bridge plate, and the moving contact bridge plate is an original part of the contactor.

The shielding arc-extinguishing device is provided with tension spring energy storage and release functions.

The shielding arc-extinguishing device is specifically used for rapidly completing energy storage and energy release of a tension spring in the shielding arc-extinguishing device under the toggle action of a limiting device by means of displacement of a bridge plate of the moving contact when the moving contact and the static contact of a contactor are opened in a breaking mode, so that an insulating shielding piece in the shielding arc-extinguishing device rapidly shields and isolates the moving contact and the static contact, electric arcs are forced to be rapidly elongated towards an arc-extinguishing chamber to be extinguished or enter the arc-extinguishing chamber to be quenched in a cooling mode, arc extinguishing time is shortened, arc extinguishing is rapidly carried out, contact burning loss is reduced, when the moving contact and the static contact of the contactor are closed, the insulating shielding piece in the shielding arc-extinguishing device is.

Compared with the prior art, the technical scheme has the following advantages:

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic view of a shielding arc-extinguishing device of a contactor contact according to an embodiment of the present application;

fig. 2 and 3 are schematic diagrams of a shielding arc extinguishing device (scheme one) of a contactor contact according to an embodiment of the application;

fig. 4, 5, 6 and 7 are schematic diagrams of a shielding arc-extinguishing device (scheme two) of a contactor contact according to still another embodiment of the present application.

Detailed Description

As described in the background section, how to rapidly extinguish the arc and reduce the burning loss of the contact during breaking is a main way to improve the electrical life of the contact, and is also an urgent problem to be solved by those skilled in the art.

The inventor researches and discovers that at present, domestic and foreign contactors adopt an arc extinguishing chamber or arc striking piece (small-capacity) technology to cool and extinguish electric arcs generated when alternating current and direct current load currents are interrupted, and the arc extinguishing principle of the technology is as follows: when the load current is cut off, electric arcs are generated between the moving contact and the static contact and are lengthened to a certain length, self-excitation field electrodynamic force or other modes are adopted to drive the electric arcs to enter the arc extinguish chamber or the arc striking piece is utilized to attract the electric arcs to the arc striking piece (with small capacity), so that the electric arcs are extinguished under the cooling action of a metal grid piece or the metal arc striking piece in the arc extinguish chamber (the alternating current is easy to extinguish relative to the direct current due to zero crossing points). The arc extinguishing effect of the method is influenced by factors such as the sizes of an arc extinguishing chamber and an arc striking piece, the breaking distance of a contact, the contact material, an alternating current load or a direct current load and the like, the electric service life of the arc extinguishing chamber is almost impossible to be greatly improved after the arc extinguishing chamber and the arc striking piece are designed and optimized to a certain degree, and if the electric service life parameters are required to be continuously improved, the manufacturing cost is greatly improved.

In addition, when the photovoltaic power generation system or various direct current control systems are applied, the critical load current (although the current value is not large) is not easy to break and extinguish except the characteristic that the direct current does not have a zero crossing point, and only when the electric arc is quickly extinguished through some technical measures, the contactor can easily complete the task of breaking the load current or the critical load current, so that the electric service life is prolonged.

With the popularization and improvement of industrial automation control and new energy technology, particularly the wide application of direct current control technology, a new contactor arc-extinguishing device is objectively needed, namely an auxiliary arc-extinguishing device is needed, under the condition that the cost is not remarkably increased, the capacity of breaking alternating current and direct current load current or direct current critical load current is greatly improved, the electric service life parameter is remarkably improved, and the generalization degree of products in the field of alternating current and direct current control is realized.

In order to rapidly extinguish electric arc and reduce contact burning loss, the application provides a shielding arc extinguishing device of a contactor contact, and can also be said to provide an auxiliary arc extinguishing device of the contactor contact.

When the moving contact and the static contact are closed, the insulation shielding piece in the shielding arc-extinguishing device is rapidly opened, and the moving contact and the static contact are reliably closed.

Further, because the device described in this application can shorten the arc extinguishing time, extinguishes the electric arc fast and reduces the contact loss of burning, the device described in this application has stronger disconnected electric current ability promptly, so the device described in this application is more applicable to the direct current control system who is difficult to divide and the arc extinguishing.

The following introduces a shielding arc extinguishing device of contactor contact, the device includes specifically: and the shielding arc-extinguishing device is additionally arranged in the cavities of the moving contact and the static contact of the contactor.

The shielding arc-extinguishing device is used for rapidly isolating the moving contact and the static contact by an insulating shielding piece in the shielding arc-extinguishing device when the moving contact and the static contact of the contactor are opened in a breaking mode, so that electric arcs are forced to be elongated and extinguished towards the arc-extinguishing chamber or enter the arc-extinguishing chamber to be cooled and extinguished, arc-extinguishing time is shortened, the electric arcs are rapidly extinguished, contact burning loss is reduced, and when the moving contact and the static contact of the contactor are closed, the insulating shielding piece in the shielding arc-extinguishing device is rapidly opened, and the moving contact and the static contact.

The shielding arc-extinguishing device of the contactor contact further comprises a limiting device additionally arranged in a cavity of a moving contact and a static contact of the contactor.

And the limiting device is used for matching the action stroke displacement of the moving contact bridge plate to drive the shielding arc-extinguishing device to act, so that the moving contact and the static contact are rapidly isolated by an insulating shielding piece in the shielding arc-extinguishing device.

A shielding arc-extinguishing device is particularly used for driving the shielding arc-extinguishing device to act by utilizing the cooperation between the action stroke displacement of a bridge plate of a movable contact and a limiting device when the movable contact and a fixed contact of a contactor are opened in a breaking mode, an insulating shielding piece in the shielding arc-extinguishing device rapidly isolates the movable contact and the fixed contact, electric arcs are forced to be rapidly elongated towards an arc-extinguishing chamber to be extinguished or enter the arc-extinguishing chamber to be extinguished in a cooling mode, the arc-extinguishing time is shortened, the electric arcs are rapidly extinguished, the contact burning loss is reduced, and when the movable contact and the fixed contact of the contactor are closed, the insulating shielding piece in the shielding arc-.

The shielding arc extinguishing device is a shielding arc extinguishing device with spring energy storage and release functions, the shielding arc extinguishing device is installed on a moving contact bridge plate, the moving contact bridge plate is an original part of a contactor, and a limiting device is installed in a moving contact cavity and a static contact cavity and can be additionally installed on two sides or one side of the contact cavity.

A shielding arc-extinguishing device is particularly used for rapidly completing energy storage and energy release of a tension spring in the shielding arc-extinguishing device under the stirring action of a limiting device by means of displacement of a bridge plate of a moving contact when the moving contact and a static contact of a contactor are opened in a breaking mode, so that an insulating shielding piece in the shielding arc-extinguishing device rapidly shields and isolates the moving contact and the static contact, electric arcs are forced to be rapidly elongated towards an arc-extinguishing chamber to be extinguished or enter the arc-extinguishing chamber to be extinguished in a cooling mode, arc extinguishing time is shortened, electric arcs are rapidly extinguished, contact burning loss is reduced, when the moving contact and the static contact of the contactor are closed, the insulating shielding piece in the shielding arc-extinguishing device.

The limiting device is additionally arranged in the cavity of the moving contact and the static contact. When the limiting device is arranged on two sides of the moving contact and static contact cavity, the limiting device comprises a limiting part and a limiting block. When the limiting device is arranged on one side of the moving contact and static contact cavity, the limiting device comprises a limiting part and a limiting guide rail. For convenience of description, a technical scheme that the limiting devices are arranged on two sides of the moving contact and static contact chamber is taken as a scheme one, and a technical scheme that the limiting devices are arranged on one side of the moving contact and static contact chamber is taken as a scheme two.

The first technical scheme is described in detail below, that is, when the limiting device is installed on two sides of the moving contact and static contact chamber, the limiting device comprises a limiting part and a limiting block. The shielding arc-extinguishing device comprises a left insulation shielding part, a right insulation shielding part, a positioning support part, a tension spring and a positioning shaft pin, wherein the insulation shielding part is installed on the positioning support part through the positioning shaft pin, the positioning support part is fixed on the moving contact bridge plate through a screw, and the moving contact bridge plate is an original part of the contactor.

The scheme is that a shielding arc-extinguishing device with spring energy-storing and energy-releasing functions and a limiting device are additionally arranged in a cavity of a moving contact and a static contact of a contactor, when a line needs to normally break any load current value, when the moving contact and the static contact are disconnected and opened, the energy storage and release actions of a spring (namely a tension spring) are instantly completed by the displacement of the moving contact (or the displacement of a bridge plate of the moving contact) and the stirring action of the shielding arc-extinguishing device under the stirring action of the limiting devices at the two sides in the contact cavity, the left insulating shielding part and the right insulating shielding part are rapidly driven to be clamped between the moving contact and the static contact of the contactor from the two sides, and the closed insulating shielding piece reliably isolates the moving contact and the static contact, so that the electric arc is forced to be elongated towards the arc extinguish chamber or enters the arc extinguish chamber to be cooled and extinguished, the effects of elongation, cutting off and quickly extinguishing the electric arc are realized, the arc extinguishing time is shortened, the electric arc is quickly extinguished, and the burning loss of the contact is reduced. When the contactor is switched on again, namely when a moving contact and a static contact of the contactor are closed, the shielding arc extinguishing device is shifted through the reverse displacement (opposite direction) of the moving contact and the limiting devices on the two sides in the contact cavity to instantly complete the actions of spring energy storage and energy release, and the left insulating shielding part and the right insulating shielding part are rapidly driven to be opened towards the two sides, so that the moving contact and the static contact are reliably switched on.

The shielding arc-extinguishing device of the contactor comprises a left insulating shielding part, a right insulating shielding part, a positioning supporting part, a tension spring and a positioning shaft pin, and the limiting device comprises a limiting part and a limiting block; the original parts of the contactor mainly comprise a moving contact bridge plate, a moving contact, a fixed contact, a traction sliding block, a bridge plate pressure spring, an electromagnet traction pull rod, a reset spring, an electromagnet, a contactor shell and the like. The left and right insulation shielding parts are symmetrically arranged on the positioning supporting part through the positioning shaft pin, the tension spring is arranged between the two insulation shielding parts relative to the central line of the positioning shaft pin, when the two insulation shielding parts are closed or opened, the tension spring can complete the processes of energy storage and energy release from left to right or from right to left, when the two insulation shielding parts are closed, the central line of the tension spring crosses the central line of the positioning shaft pin from left to right, and when the two insulation shielding parts are opened, the two insulation shielding. The positioning support may limit the angular position at which the two pieces of insulation shield are closed or opened. The positioning support piece is fixedly arranged above the moving contact bridge plate, the moving contact bridge plate and a bridge plate pressure spring are arranged in the traction sliding block, the bridge plate pressure spring acts between the moving contact bridge plate and the traction sliding block (used for generating certain over-travel and contact pressure after the moving contact and the static contact are closed), and the limiting devices are arranged on two sides in a moving contact chamber and a static contact chamber of the contactor. When the contactor is disconnected, the electromagnet is powered off, the electromagnet traction pull rod drives the traction sliding block and the moving contact bridge plate to move leftwards under the action of the reset spring, meanwhile, the left and right insulation shielding parts instantly complete the energy storage and release processes of the tension spring under the action of the limiting device and clamp the middle of the moving contact bridge plate to be closed, so that the moving contact and the static contact are shielded and isolated, electric arcs are forced to be rapidly elongated and extinguished towards the direction of the arc extinguish chamber or enter the arc extinguish chamber to be cooled and extinguished, the effects of rapidly cutting off, elongating and extinguishing the electric arcs are realized, the arc extinguishing time is shortened, and the burning loss of the contacts. When the contactor is closed, the traction sliding block overcomes the action of a reset spring (simultaneously storing energy) through an electromagnet traction pull rod under the action of tension generated after the electromagnet is electrified to drive the traction sliding block and the moving contact bridge plate to move rightwards, meanwhile, the left and right insulation shielding parts instantly complete the energy storage and release processes of the tension spring under the action of a limiting device and quickly open towards the two sides of the moving contact bridge plate, and the moving contact and the fixed contact of the contactor complete closing operation.

According to the first technical scheme of the shielding arc-extinguishing device for the contactor contact, the shielding arc-extinguishing device is mainly characterized in that the shielding arc-extinguishing device is additionally arranged in a cavity of a moving contact and a static contact of the contactor, when the contactor is in a closing state, once the opening phenomenon occurs, the insulating shielding device can rapidly close the left and right insulating shielding parts and insert the left and right insulating shielding parts between the moving contact and the static contact, so that the moving contact and the static contact of the contactor are shielded, electric arcs are rapidly cut off, lengthened and extinguished, the arc extinguishing time is shortened, and the burning loss of the contacts is reduced by rapidly extinguishing the electric. When the contactor is in a switching-off state, once a switching-on phenomenon occurs, the insulation shielding device can rapidly separate the left insulation shielding part and the right insulation shielding part and avoid the left insulation shielding part and the right insulation shielding part to two sides of the moving contact and the static contact without influencing the switching-on of the contactor.

The first scheme of the embodiment of the application is that a shielding arc-extinguishing device driven by spring force is installed on a moving contact bridge plate of a contactor. When the contactor has a brake separating phenomenon, a moving contact bridge plate of the contactor moves leftwards for a certain distance and continues to move leftwards for displacement, a left insulating shielding part and a right insulating shielding part in the shielding and arc extinguishing device respectively rotate towards a closing direction under the stirring of a limiting part and a limiting block which are arranged on a contactor shell, and simultaneously, a tension spring arranged between the left insulating shielding part and the right insulating shielding part is lengthened, when the tension spring between the left insulating shielding part and the right insulating shielding part is lengthened to the maximum and the central line of the tension spring rightwards crosses the centers of rotary positioning shaft pins of the left insulating shielding part and the right insulating shielding part, the left insulating shielding part and the right insulating shielding part are rapidly closed under the instant energy release action of the tension spring which is lengthened and stored, so that the moving contact and the.

When the contactor has a switching-on phenomenon, a moving contact bridge plate of the contactor moves rightwards for a certain distance and continues to move rightwards for displacement, a left insulating shielding part and a right insulating shielding part in the shielding arc-extinguishing device move downwards to two sides under the stirring of a limiting part and a limiting block which are installed on a contactor shell, and meanwhile, a tension spring installed between the left insulating shielding part and the right insulating shielding part is lengthened, when the tension spring between the left insulating shielding part and the right insulating shielding part is lengthened to the maximum and the central line of the tension spring passes over the center of a rotary positioning shaft pin of the left insulating shielding part and the right insulating shielding part leftwards, the left insulating shielding part and the right insulating shielding part are rapidly opened under the instant energy release action of the lengthened energy.

The opening action and displacement of the moving contact bridge plate of the contactor are realized by pushing the traction sliding block by the reset spring when the electromagnet is powered off. The closing action and displacement of the bridge plate of the moving contact are realized by driving an electromagnet traction pull rod and a traction sliding block through the pulling force generated after the electromagnet is electrified (meanwhile, a return spring stores energy). The electromagnet generates pulling force to drive the traction sliding block to move rightwards by electrifying a coil of the electromagnet; the traction sliding block is driven to move leftwards by the power loss of the coil and the energy release of the return spring.

Referring to fig. 1, 2 and 3 (option one), the shielded arc extinguishing device 3 mainly includes: the device comprises a left insulation shielding part 3-1, a right insulation shielding part 3-2, a positioning supporting part 3-3, a tension spring 3-4, a positioning shaft pin 3-5 and a screw 3-6, and the limiting device comprises a limiting part 4 and a limiting block 4-A. Other spare parts are contactor original design, include: the device comprises a static contact 1, a dynamic contact bridge plate 2, a dynamic contact 2-1, a traction sliding block 5, a bridge plate pressure spring 6, an arc extinguish chamber 7, a static contact supporting seat 8, a reset spring 9, an electromagnet 10, an electromagnet traction pull rod 11, a contactor shell 12 and the like.

A positioning support 3-3 is fixed on a movable contact bridge plate 2 by a shielding arc-extinguishing device 3 through screws 3-6, a left insulation shielding part 3-1 and a right insulation shielding part 3-2 of the shielding arc-extinguishing device 3 are installed on the positioning support 3-3 through a positioning shaft pin 3-5, a tension spring 3-4 is installed on the left insulation shielding part 3-1 and the right insulation shielding part 3-2, and a limiting part 4 and a limiting block 4-A are installed on the inner wall of a contact chamber of a contactor shell 12.

The static contact 1 is installed on a static contact support plate 8 (integrated with the shell), the electromagnet 10 is installed inside the shell, the reset spring 9 is installed on an electromagnet traction pull rod 11, the traction sliding block 5 is connected with the electromagnet traction pull rod 11 through a hinge, and the moving contact bridge plate 2 and the bridge plate pressure spring 6 are installed on the traction sliding block 5.

When the coil of the electromagnet 10 is electrified, under the action of electromagnetic attraction, the electromagnet pulls the pull rod 11 to drive the traction sliding block 5 to move rightwards; when the coil of the electromagnet 10 is de-energized, the energy is released through the return spring 9 to drive the electromagnet to pull the pull rod 11 and the traction sliding block 5 to move leftwards. The traction sliding block 5 moves leftwards and rightwards and simultaneously drives the moving contact bridge plate 2 to move leftwards and rightwards, and the left insulation shielding part 3-1 and the right insulation shielding part 3-2 in the shielding arc-extinguishing device 3 driven by the spring force arranged on the moving contact bridge plate 2 realize shielding or opening of the moving contact 2-1 and the static contact 1 under the stirring action of the limiting part 4 and the limiting block 4-A arranged on the inner wall of the contact cavity of the contactor shell 12.

The left insulating shielding part 3-1, the right insulating shielding part 3-2 and other parts are made of high-strength and high-temperature-resistant electric arc engineering plastic materials. The service life of the product can be ensured to meet the technical requirements specified by related product standards.

The second technical scheme is described in detail below, that is, when the limiting device is installed on one side of the moving contact and static contact chamber, the limiting device comprises a limiting part and a limiting guide rail.

The second technical scheme is that a shielding arc-extinguishing device with a spring energy storage and release function and a limiting device are additionally arranged in a cavity of a moving contact and a static contact of a contactor, when a line needs to be normally broken at any load current value, the moving contact and the static contact are opened in a breaking mode, the shielding arc-extinguishing device is shifted through the displacement of a moving contact and the limiting device on one side in the cavity of the contact to instantly finish the energy storage and release actions of the spring on the other side, an insulating shielding part is rapidly inserted between the moving contact and the static contact of the contactor from the inner side to the outer side of the moving contact, the moving contact and the static contact are reliably isolated by the insulating shielding part, electric arcs are forced to be rapidly elongated towards the direction of an arc extinguish chamber or enter the arc extinguish chamber for cooling and extinguishing, the. When the contactor is switched on again, namely when the moving contact and the static contact of the contactor are closed, the shielding arc extinguishing device is shifted by the displacement (opposite direction) of the moving contact and the limiting device on one side in the contact chamber to complete the action of spring energy storage and energy release instantly, so that the insulating shielding part returns to the inner side rapidly, and the moving contact and the static contact are switched on reliably.

Referring to fig. 1, 4, 5, 6 and 7, the shielding arc-extinguishing device 3 of the contactor includes an insulating shielding member 3-1, a positioning support member 3-3, a tension spring 3-4, a positioning shaft pin 3-5, and the like, and the limiting device includes a limiting member 4, a limiting guide rail 4-a, and the like; the original parts of the contactor mainly comprise a moving (same as the scheme I) and static contact 1, a moving contact bridge plate 2, a moving contact 2-1, a traction sliding block 5, a bridge plate pressure spring 6, an arc extinguish chamber 7, a static contact supporting seat 8, a return spring 9, an electromagnet 10, an electromagnet traction pull rod 11, a contactor shell 12 and the like. The shielding part 3-1 (one piece) is arranged on a positioning support part 3-3 through a positioning shaft pin 3-5, a roller 3-7 is arranged on a lengthened arm at one side of the insulating shielding part 3-1 through a shaft pin 3-8, the roller 3-7 corresponds to a limiting part 4 and a limiting guide rail 4-A which are arranged at one side in a moving contact chamber and a static contact chamber of a contactor, a fixed shaft pin 3-9 is arranged on a short arm at the other side of the insulating shielding part 3-1, a fixed shaft pin 3-10 is also arranged at the same side of the positioning support part 3-3, and a tension spring 3-4 is arranged between the two fixed shaft pins corresponding to the central line of the positioning shaft pin 3-5. The insulation shielding part 3-1 can swing by taking a positioning shaft pin 3-5 of the positioning support part 3-3 as a center, and the power of the swing is from the motion track of a lengthened arm at the other side of the insulation shielding part 3-1 in a limiting guide rail 4-A of the limiting part 4 through a roller 3-7 caused by the left and right motion of the movable contact bridge plate 2. The insulation shielding piece 3-1 swings forwards or backwards once, the tension spring 3-4 can complete the processes of lengthening, storing energy and releasing energy from top to bottom or from bottom to top once, the central line of the tension spring 3-4 crosses the central line of the positioning shaft pin 3-5 from top to bottom during shielding, and the opposite is realized during opening.

The position-defining rails 4-a may limit the angular position at which the dielectric shield 3-1 may be shielded or opened. The positioning support part 3-3 is fixedly arranged above the moving contact bridge plate 2, the moving contact bridge plate 2 and a bridge plate pressure spring 6 are arranged in a traction sliding block 5, the bridge plate pressure spring 6 acts between the moving contact bridge plate 2 and the traction sliding block 5 (used for generating certain contact overtravel and pressure after the moving contact and the static contact are closed), and the limiting part 4 and the limiting guide rail 4-A are arranged on one side in a moving contact chamber and a static contact chamber of the contactor. When the contactor is disconnected, the electromagnet 10 is de-energized, the electromagnet traction pull rod 11 moves leftwards under the action of the reset spring 9, meanwhile, the insulation shielding part 3-1 swings anticlockwise around the positioning shaft pin 3-5 as a center under the action of the limiting part 4 and the limiting guide rail 4-A, the stretching, energy storage and energy release processes of the tension spring 3-4 are instantly completed, and the tension spring 3-4 is inserted between the moving contact 2-1 and the static contact 1, so that the moving contact and the static contact of the contactor are shielded, electric arcs are quickly cut off, stretched and extinguished, the arc extinguishing time is shortened, and the burning loss of the contacts is reduced. When the contactor is closed, the traction sliding block 5 overcomes the action of a reset spring 9 (simultaneously storing energy) through an electromagnet traction pull rod 11 to drive the traction sliding block 5 and the moving contact bridge plate 2 to move rightwards under the action of tension generated after an electromagnet 10 is electrified, meanwhile, the insulation shielding piece 3-1 swings clockwise by taking the positioning shaft pin 3-5 as a center under the action of a limiting guide rail 4-A of the limiting piece 4, the processes of stretching, storing energy and releasing energy of the tension spring 3-4 are instantly finished, the moving contact bridge plate 2 is reversely and quickly opened, and the moving contact and the static contact of the contactor finish closing operation.

Obviously, the added shielding arc-extinguishing device of the present application can be used for various types of contactors.

According to the shielding arc-extinguishing device of the contactor, the insulating shielding plate is made of high-temperature-resistant and arc-resistant insulating materials.

The shielding arc-extinguishing device is driven to act by utilizing the action stroke displacement of the moving contact bridge plate and the matching between the limiting devices fixed on the two sides (scheme one) or one side (scheme two) in the moving contact cavity and the static contact cavity. When the contactor is disconnected, the electromagnet is powered off, the moving contact bridge plate moves leftwards rapidly under the action of the reset spring through the traction sliding block and the electromagnet traction pull rod, the moving contact and the static contact are gradually opened and generate electric arcs, meanwhile, the shielding arc-extinguishing device acts rapidly, the moving contact and the static contact of the contactor are isolated rapidly through the insulating shielding piece in the shielding arc-extinguishing device, the electric arcs are forced to be cut off, elongated and extinguished rapidly, and therefore reliable breaking of the contactor is achieved, the capacity of the contactor for breaking normal load current is improved, and the electric service life is effectively prolonged.

On the contrary, when the contactor is closed, the electromagnet is electrified and pulls the moving contact bridge plate to move rightwards quickly, the insulation shielding piece in the shielding arc-extinguishing device is opened quickly by adopting the same principle, the moving contact and the static contact are ensured to be closed reliably, and only the power at the moment is not from the action of the reset spring but the traction force of the electromagnet.

The shielding arc-extinguishing device described in the application can achieve the following technical progress after being applied to contactor products of different forms:

1. the capacity of breaking alternating current and direct current load current of the product can be greatly improved, and the electric service life is prolonged;

2. the problem that the direct current critical load current is difficult to break can be effectively solved;

3. the alternating current contactor can be used for realizing the alternating current and direct current in mass production and application at present.

In the description, each part is described in a progressive manner, each part is emphasized to be different from other parts, and the same and similar parts among the parts are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shielded arc quenching device for a contactor contact, the device comprising:

2. The shielded arc quenching device of a contactor contact according to claim 1,

3. The shielded arc quenching device for the contactor of claim 1 further comprising a limiting device installed in the chamber of the moving contact and the stationary contact of the contactor.

4. The shielded arc quenching device of a contactor contact according to claim 3,

5. The shielded arc quenching device of the contactor contact according to claim 1, wherein the shielded arc quenching device is a shielded arc quenching device with tension spring energy storage and release functions.

6. The shielded arc quenching device of a contactor contact according to claim 5,