A shielding arc extinguishing method and device for contactor contacts

Abstract

The embodiment of the present application discloses a shielding arc extinguishing method and device for contactor contacts, wherein a shielding arc extinguishing device is installed in the chambers of the moving contact and the static contact of the contactor. When the line needs to normally interrupt any load current value, while the moving contact and the static contact are disconnected and opened, the insulating shielding member in the shielding arc extinguishing device quickly isolates the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, thereby achieving reliable interruption of the moving contact and the static contact of the contactor, thereby shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning, thereby improving the contactor's ability to interrupt normal load current and increasing the electrical life of the contactor.

Description

Technical Field

[0001] The present invention relates to the field of electric power, and in particular to a shielding arc extinguishing method and device for contactor contacts. Background Art

[0002] Contactors are important electrical components in industrial and civilian low-voltage control electrical equipment. They are primarily used to frequently connect and disconnect AC and DC control circuits of varying capacities, primarily controlling electric motors. Their primary technical specification is electrical life (the number of loaded operating cycles under the operating conditions specified in the product standard). This life span is related to the material of the electrical contact, contact pressure, and arc extinguishing performance when the moving and stationary contacts are disconnected. When a contactor interrupts normal load current, a plasma arc (the arc is conductive) is generated between the moving and stationary contacts. Rapidly extinguishing this arc during disconnection to minimize contact wear is the primary method for improving electrical life and a pressing challenge for those skilled in the art. Summary of the Invention

[0003] In order to solve the above technical problems, the embodiments of the present application provide a shielding arc extinguishing method and device for contactor contacts, and a shielding arc extinguishing device is installed in the chambers of the moving contact and the static contact of the contactor. When the line needs to normally interrupt any load current value, while the moving contact and the static contact are disconnected and opened, the insulating shielding member in the shielding arc extinguishing device quickly isolates the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, thereby achieving reliable interruption of the moving contact and the static contact of the contactor, thereby shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning, thereby improving the contactor's ability to interrupt normal load current and improving the electrical life of the contactor.

[0004] The embodiments of this application provide the following technical solutions:

[0005] A shielding arc extinguishing method for contactor contacts, wherein shielding arc extinguishing devices are installed in the chambers of the moving contact and the static contact of the contactor, comprising:

[0006] When the moving contact and the static contact are disconnected and opened, the insulating shielding parts in the arc extinguishing device quickly isolate the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning.

[0007] This also includes that, during the closing operation of the moving contact and the static contact, the insulating shielding member in the arc extinguishing device is quickly opened to ensure that the moving contact and the static contact are reliably closed.

[0008] The arc extinguishing device is also included in that the shielding arc extinguishing device is installed on the moving contact bridge plate, the moving contact bridge plate is an original component of the contactor, and the limiting device is installed in the moving contact and the static contact chamber;

[0009] When the moving contact and the static contact of the contactor are disconnected and opened, the insulating shielding member in the arc extinguishing device quickly isolates the moving contact and the static contact, specifically including:

[0010] When the moving contact and the static contact of the contactor are disconnected and opened, the shielding arc extinguishing device is driven to operate by the cooperation between the action stroke displacement of the moving contact bridge plate and the limit device, and the insulating shielding part in the shielding arc extinguishing device quickly isolates the moving contact and the static contact.

[0011] The arc-extinguishing device is a shielding arc-extinguishing device with a tension spring energy storage and release function.

[0012] The method utilizes the cooperation between the action stroke displacement of the moving contact bridge plate and the limit device to drive the shielding arc extinguishing device to operate, and the insulating shielding member in the shielding arc extinguishing device quickly isolates the moving contact and the static contact, specifically including:

[0013] Relying on the displacement of the moving contact bridge plate, the energy storage and release of the tension spring in the shielding arc extinguishing device are quickly completed under the toggling action of the limit device, so that the insulating shielding part in the shielding arc extinguishing device quickly shields and isolates the moving contact and the static contact.

[0014] A shielding arc extinguishing device for contactors, comprising:

[0015] The shielded arc extinguishing device is used to quickly isolate the moving contact and the static contact of the contactor when the moving contact and the static contact are disconnected and opened, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burnout. When the moving contact and the static contact of the contactor are closed, the insulating shield in the shielded arc extinguishing device is quickly opened to ensure that the moving contact and the static contact are reliably closed;

[0016] Wherein, the shielding arc extinguishing device is installed in the chambers of the moving contact and the static contact of the contactor.

[0017] Among them, the shielding arc extinguishing device is also used to quickly open the insulating shielding parts in the shielding arc extinguishing device when the moving contact and the static contact are closed, so as to ensure that the moving contact and the static contact are reliably closed.

[0018] The invention also includes a limiting device installed in the chambers of the moving contact and the static contact of the contactor.

[0019] Among them, the limit device is used to cooperate with the action stroke displacement of the moving contact bridge plate to drive the shielding arc extinguishing device to operate, so that the insulating shielding member in the shielding arc extinguishing device can quickly isolate the moving contact and the static contact;

[0020] The shielded arc extinguishing device is specifically used to drive the shielded arc extinguishing device to operate by utilizing the cooperation between the action stroke displacement of the moving contact bridge plate and the limit device when the moving contact and the static contact of the contactor are disconnected and opened. The insulating shielding member in the shielded arc extinguishing device quickly isolates the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, thereby shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning. When the moving contact and the static contact of the contactor are closed, the insulating shielding member in the shielded arc extinguishing device is quickly opened to ensure that the moving contact and the static contact are reliably closed;

[0021] Among them, the shielding arc extinguishing device is installed on the moving contact bridge plate, and the moving contact bridge plate is an original component of the contactor.

[0022] Wherein, the shielding arc extinguishing device is a shielding arc extinguishing device with tension spring energy storage and energy release functions.

[0023] Among them, the shielding arc extinguishing device is specifically used to quickly complete the energy storage and energy release of the tension spring in the shielding arc extinguishing device under the toggle action of the limit device by relying on the displacement of the moving contact bridge plate when the moving contact and the static contact of the contactor are disconnected and opened, so that the insulating shielding parts in the shielding arc extinguishing device can quickly shield and isolate the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber for cooling and extinguishing, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning. When the moving contact and the static contact of the contactor are closed, the insulating shielding parts in the shielding arc extinguishing device are quickly opened to ensure that the moving contact and the static contact are reliably closed.

[0024] Compared with the existing technology, the above technical solution has the following advantages:

[0025] The embodiment of the present application discloses a shielding arc extinguishing method and device for contactor contacts, wherein a shielding arc extinguishing device is installed in the chambers of the moving contact and the static contact of the contactor. When the line needs to normally interrupt any load current value, while the moving contact and the static contact are disconnected and opened, the insulating shielding member in the shielding arc extinguishing device quickly isolates the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, thereby achieving reliable interruption of the moving contact and the static contact of the contactor, thereby shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning, thereby improving the contactor's ability to interrupt normal load current and increasing the electrical life of the contactor. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0027] Figure 1 A schematic diagram of a shielding arc extinguishing method for contactors provided in one embodiment of the present application;

[0028] Figure 2 、 Figure 3 and Figure 4 Each of them is a schematic diagram of a shielding arc extinguishing method for contactors provided in one embodiment of the present application (Scheme 1);

[0029] Figure 5 、 Figure 6 、 Figure 7 and Figure 8 Both are schematic diagrams of a shielding arc extinguishing method for contactors (Scheme 2) provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0030] As described in the background technology section, how to quickly extinguish the arc during disconnection and reduce contact burnout is the main way to increase its electrical life and is also a problem that needs to be urgently solved by those skilled in the art.

[0031] The inventors have discovered that, currently, both domestic and foreign contactors use arc extinguishing chambers or arc-starting pieces (small capacity) to cool and extinguish the arcs generated when interrupting AC and DC load currents. The arc extinguishing principle of this technology is as follows: when interrupting the load current, an arc is generated between the moving and static contacts and stretched to a certain length. The arc is driven into the arc extinguishing chamber by self-excited magnetic field electromotive force or other means, or the arc is attracted to the arc-starting piece (small capacity) by the arc-starting piece, so that it is extinguished under the cooling effect of the metal grid or metal arc-starting piece in the arc extinguishing chamber (AC current is easier to extinguish than DC current due to its zero crossing point). The arc extinguishing effect of this method is affected by factors such as the size of the arc extinguishing chamber and arc-starting piece, the contact breaking distance, the contact material, and whether the load is AC or DC. After the design is optimized to a certain extent, it is almost impossible to significantly increase its electrical life. If the electrical life parameters are to be further improved, the manufacturing cost will be greatly increased.

[0032] In addition, when used in photovoltaic power generation systems or various DC control systems, in addition to the fact that DC current has no zero-crossing point, its critical load current (although the current value is not large) is also more difficult to disconnect and extinguish the arc. Only by quickly extinguishing the arc through certain technical measures can the contactor easily complete the task of disconnecting the load current or critical load current and improve the electrical life.

[0033] With the promotion and improvement of industrial automation control and new energy technologies, especially the widespread application of DC control technology, there is an objective need for a new arc extinguishing method for contactors, or it can be said that there is a need for an auxiliary arc extinguishing method, which can greatly improve its ability to break AC, DC load current or DC critical load current without significantly increasing costs, significantly improve electrical life parameters, and achieve the degree of universality of products in the AC and DC control fields.

[0034] In order to quickly extinguish the arc and reduce contact burning, the present application provides a shielded arc extinguishing method for contactor contacts, or it can be said that the present application provides an auxiliary arc extinguishing method for contactor contacts. The core idea is to install a shielded arc extinguishing device in the chambers of the moving contact and the static contact of the contactor. When the line needs to normally interrupt any load current value, while the moving contact and the static contact are disconnected and opened, the insulating shielding member in the shielded arc extinguishing device quickly isolates the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber for cooling and extinguishing, thereby achieving reliable disconnection of the moving contact and the static contact of the contactor, thereby shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning, thereby improving the contactor's ability to interrupt normal load current and improving the electrical life of the contactor.

[0035] During the closing operation of the moving contact and the static contact, the insulating shielding member in the arc extinguishing device opens rapidly to ensure that the moving contact and the static contact are closed reliably.

[0036] Furthermore, because the method described in this application can shorten the arc extinguishing time, quickly extinguish the arc and reduce contact burn, that is, the method described in this application has a strong ability to interrupt current, the method described in this application is more suitable for DC control systems that are not easy to interrupt and extinguish arcs.

[0037] Figure 1 A shielding arc extinguishing method for contactor contacts is provided, wherein shielding arc extinguishing devices are installed in the chambers of the moving contact and the static contact of the contactor. The method comprises:

[0038] When the moving contact and the static contact of the contactor are disconnected and opened, the insulating shielding parts in the shielding arc extinguishing device installed in the chamber of the moving contact and the static contact of the contactor quickly isolate the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning.

[0039] During the closing operation of the moving contact and the static contact of the contactor, the insulating shielding members in the shielding arc extinguishing device installed in the chambers of the moving contact and the static contact of the contactor are quickly opened to ensure that the moving contact and the static contact are reliably closed.

[0040] Among them, the shielding arc extinguishing device is a shielding arc extinguishing device with spring energy storage and energy release functions. The shielding arc extinguishing device is installed on the moving contact bridge plate, which is an original component of the contactor. The limit device is installed in the moving contact and static contact chambers. The limit device can be installed on both sides or one side of the contact chamber.

[0041] Among them, when the moving contact and the static contact of the contactor are disconnected and opened, the insulating shielding member in the shielding arc extinguishing device installed in the chamber of the moving contact and the static contact of the contactor quickly isolates the moving contact and the static contact, specifically including:

[0042] When the moving contact and the static contact of the contactor are disconnected and opened, the shielding arc extinguishing device is driven by the cooperation between the action stroke displacement of the moving contact bridge plate and the limit device installed in the moving contact and the static contact chamber, and the insulating shielding part in the shielding arc extinguishing device quickly isolates the moving contact and the static contact.

[0043] The shielding arc extinguishing device is driven by the cooperation between the action stroke displacement of the moving contact bridge plate and the limit device installed in the moving contact and the static contact chamber. The insulating shielding member in the shielding arc extinguishing device quickly isolates the moving contact and the static contact. Specifically, it includes:

[0044] Relying on the displacement of the moving contact bridge plate, the energy storage and release of the tension spring in the shielding arc extinguishing device are quickly completed under the toggling action of the limit device, so that the insulating shielding part in the shielding arc extinguishing device quickly shields and isolates the moving contact and the static contact.

[0045] The limiting device is installed in the chambers of the moving contact and the stationary contact. When the limiting device is installed on both sides of the moving contact and the stationary contact chamber, the limiting device includes a limiting member and a limiting block. When the limiting device is installed on one side of the moving contact and the stationary contact chamber, the limiting device includes a limiting member and a limiting guide rail. For ease of description, the technical solution in which the limiting device is installed on both sides of the moving contact and the stationary contact chamber is referred to as Solution 1, and the technical solution in which the limiting device is installed on one side of the moving contact and the stationary contact chamber is referred to as Solution 2.

[0046] The following details Technical Solution 1, which describes the position limiting device installed on both sides of the moving and stationary contact chambers. The position limiting device includes a position limiting member and a position limiting block. The arc-extinguishing device includes a left insulating shield, a right insulating shield, a positioning support, a tension spring, and a positioning pin. The insulating shield is mounted on the positioning support via the positioning pin, and the positioning support is fixed to the moving contact bridge plate with screws. The moving contact bridge plate is an original component of the contactor.

[0047] Solution 1 is to install a shielded arc extinguishing device and a limit device with spring energy storage and release functions in the moving and static contact chambers of the contactor. When the line needs to normally interrupt any load current value, at the same time as the moving and static contacts are disconnected and opened, the shielded arc extinguishing device instantly completes the spring (i.e., tension spring) energy storage and release actions through the displacement of its moving contact (or the displacement of the moving contact bridge plate) and the toggling action of the limit devices on both sides of the contact chamber, and quickly drives the left and right insulating shielding parts to clamp between the moving and static contacts of the contactor from both sides, and close the insulating shielding parts. The closed insulating shielding parts reliably isolate the moving and static contacts, forcing the arc to quickly stretch toward the arc extinguishing chamber or enter the arc extinguishing chamber for cooling and extinguishing, thereby achieving the effects of stretching, cutting off and quickly extinguishing the arc, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning. When the contactor is connected again, that is, when the moving contact and the static contact of the contactor are closed, the shielding arc extinguishing device is driven by the reverse displacement (opposite direction) of its moving contact and the limit devices on both sides of the contact chamber to instantly complete the spring energy storage and energy release action, and quickly drive the left insulating shielding part and the right insulating shielding part to open to both sides, so that the moving and static contacts are reliably connected.

[0048] The shielding arc extinguishing method of the above-mentioned contactor, the shielding arc extinguishing device includes a left insulating shielding part, a right insulating shielding part, a positioning support part, a tension spring and a positioning shaft pin, and the limiting device includes a limiting part and a limiting block; the original parts of the contactor mainly include the moving contact bridge plate and the moving contact, the static contact, the traction slider, the bridge plate compression spring, the electromagnet traction rod, the reset spring, the electromagnet and the contactor housing, etc. The left and right insulating shielding parts are symmetrically installed on the positioning support part through the positioning shaft pin, and the tension spring is installed between the two insulating shielding parts relative to the center line of the positioning shaft pin. When the two insulating shielding parts are closed or opened, the tension spring can complete a process of storing and releasing energy from left to right or from right to left. When closed, the center line of the tension spring crosses the center line of the positioning shaft pin from left to right, and the opposite is true when opened. The positioning support part can limit the angular position of the two insulating shielding parts when closed or opened. The positioning support is mounted and fixed above the moving contact bridge plate. The moving contact bridge plate and the bridge plate compression spring are mounted within the traction slider. The bridge plate compression spring acts between the moving contact bridge plate and the traction slider (for generating a certain overtravel and contact pressure after the moving and static contacts are closed). The limit device is mounted on both sides of the moving and static contact chambers of the contactor. When the contactor is disconnected, the electromagnet loses power. The electromagnet traction rod, under the action of the reset spring, drives the traction slider and the moving contact bridge plate to move to the left. At the same time, the left and right insulating shielding members, under the action of the limit device, instantly complete the energy storage and release process of their tension springs and clamp together and close in the middle of the moving contact bridge plate, thereby achieving shielding isolation between the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish, or enter the arc extinguishing chamber to cool and extinguish, thereby achieving the effects of quickly cutting off, stretching, and extinguishing the arc, shortening the arc extinguishing time, and quickly extinguishing the arc to reduce contact burn. When the contactor is closed, the traction slider generates a pulling force after the electromagnet is energized, and the electromagnet pull rod overcomes the action of the reset spring (and stores energy at the same time), driving the traction slider and the moving contact bridge plate to move to the right. At the same time, the left and right insulating shielding parts instantly complete the energy storage and release process of their tension springs under the action of the limit device and quickly open to both sides of the moving contact bridge plate, and the moving and static contacts of the contactor complete the closing operation.

[0049] The most significant feature of the above-mentioned scheme 1 of the contactor contact shielding arc extinguishing method proposed in the present application is that a shielding arc extinguishing device is added or set in the chamber of the moving contact and the static contact of the contactor. When the contactor is in the closed state, once the opening phenomenon occurs, the insulating shielding device can quickly close the left and right insulating shielding parts and insert them between the moving and static contacts, so that the moving and static contacts of the contactor are shielded, and the arc is quickly cut off, stretched and extinguished, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burn. When the contactor is in the open state, once the closing phenomenon occurs, the insulating shielding device can quickly separate the left and right insulating shielding parts and dodge them to the sides of the moving and static contacts without affecting the closing of the contactor.

[0050] The first embodiment of the present application is to install a shielding arc extinguishing device driven by spring force on the moving contact bridge plate of the contactor. When the contactor is opened, the moving contact bridge plate of the contactor moves to the left for a certain distance and continues to move to the left. The left and right insulating shielding members in the shielding arc extinguishing device are rotated in the closing direction under the action of the limit member and the limit block installed on the contactor housing. At the same time, the tension spring installed between the left and right insulating shielding members is stretched. When the tension spring between the left and right insulating shielding members is stretched to the maximum and the center line of the tension spring passes the center of the rotation positioning shaft pin of the left and right insulating shielding members to the right, the left and right insulating shielding members are quickly closed under the action of the instantaneous release of energy from the stretched energy-storing tension spring, so that the moving and static contacts of the contactor are shielded, and the shielding arc extinguishing action of the moving and static contacts is realized when the contactor is opened.

[0051] When the contactor is closed, the moving contact bridge plate of the contactor moves a certain distance to the right and continues to move to the right. The left and right insulating shielding parts in the arc extinguishing device move to both sides under the movement of the limit parts and the limit blocks installed on the contactor housing, and at the same time, the tension spring installed between the left and right insulating shielding parts is stretched. When the tension spring between the left and right insulating shielding parts is stretched to the maximum and the center line of the tension spring passes over the center of the rotary positioning shaft pin of the left and right insulating shielding parts to the left, the left and right insulating shielding parts are quickly opened under the action of the instantaneous energy release of the stretched energy storage spring, thereby realizing reliable contact between the moving and static contacts when the contactor is closed.

[0052] The opening action and displacement of the contactor's moving contact bridge are achieved by the return spring pushing the traction slider when the electromagnet loses power. Closing action and displacement of the moving contact bridge are achieved by the tension generated by the electromagnet when it is energized, driving the electromagnet's pull rod and traction slider (while the return spring stores energy). The electromagnet generates tension by energizing its coil, driving the traction slider to the right; de-energizing its coil and releasing energy from the return spring drive the traction slider to the left.

[0053] See Figure 2 、 Figure 3 and Figure 4 (Scheme 1) The arc-extinguishing device 3 primarily comprises a left insulating shield 3-1, a right insulating shield 3-2, a positioning support 3-3, a tension spring 3-4, a positioning pin 3-5, and a screw 3-6. The limiting device comprises a limiting member 4 and a limiting block 4-A. Other components are the original contactor design, including the static contact 1, the moving contact bridge 2, the moving contact 2-1, the traction slider 5, the bridge compression spring 6, the arc-extinguishing chamber 7, the static contact support 8, the reset spring 9, the electromagnet 10, the electromagnet traction rod 11, and the contactor housing 12.

[0054] The arc-extinguishing device 3 fixes the positioning support 3-3 on the moving contact bridge plate 2 through the screw 3-6. The left insulating shielding part 3-1 and the right insulating shielding part 3-2 of the arc-extinguishing device 3 are installed on the positioning support 3-3 through the positioning shaft pin 3-5. The tension spring 3-4 is installed on the left insulating shielding part 3-1 and the right insulating shielding part 3-2. The limit part 4 and the limit block 4-A are installed on the inner wall of the contact chamber of the contactor housing 12.

[0055] The static contact 1 is installed on the static contact support plate 8 (integrated with the outer shell), the electromagnet 10 is installed inside the outer shell, the reset spring 9 is installed on the electromagnet traction rod 11, the traction slider 5 is connected to the electromagnet traction rod 11 through a hinge, and the moving contact bridge plate 2 and the bridge plate compression spring 6 are installed on the traction slider 5.

[0056] When the coil of the electromagnet 10 is energized, the electromagnet traction rod 11 drives the traction slider 5 to the right under the action of electromagnetic attraction. When the coil of the electromagnet 10 is de-energized, the reset spring 9 releases energy to drive the electromagnet traction rod 11 and the traction slider 5 to the left. As the traction slider 5 moves left and right, it drives the moving contact bridge plate 2 to move left and right. The left insulating shielding member 3-1 and the right insulating shielding member 3-2 in the shielding arc extinguishing device 3 driven by the spring force installed on the moving contact bridge plate 2 are driven by the limit member 4 and the limit block 4-A installed on the inner wall of the contact chamber of the contactor housing 12 to shield or open the moving contact 2-1 and the static contact 1.

[0057] The left insulating shield 3-1 and the right insulating shield 3-2 are made of high-strength, high-temperature arc-resistant engineering plastics, ensuring that their service life meets the technical requirements of relevant product standards.

[0058] The second technical solution is described in detail below, that is, when the limiting device is installed on one side of the movable contact and the static contact chamber, the limiting device includes a limiting member and a limiting guide rail.

[0059] The second technical solution is to install a shielded arc extinguishing device and a limit device with spring energy storage and release functions in the moving and static contact chambers of the contactor. When the line needs to normally interrupt any load current value, at the same time that the moving and static contacts are disconnected and opened, the shielded arc extinguishing device is moved by the displacement of the moving contact and the limit device on one side of the contact chamber to instantly complete the energy storage and energy release actions of the spring on the other side. An insulating shielding member is quickly inserted from the inside to the outside of the moving contact between the moving contact and the static contact of the contactor. The insulating shielding member reliably isolates the moving and static contacts, forcing the arc to quickly stretch toward the arc extinguishing chamber or enter the arc extinguishing chamber for cooling and extinguishing, thereby achieving the effects of stretching, cutting and quickly extinguishing the arc, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning. When the contactor is to be connected again, that is, when the moving contact and the static contact of the contactor are closed, the shielding arc extinguishing device is moved by the displacement of the moving contact (in the opposite direction) and the limit device on one side of the contact chamber to instantly complete the spring energy storage and energy release action, and quickly return the insulating shielding part to the inside, so that the moving and static contacts are reliably connected.

[0060] For the shielding arc extinguishing method of the above contactor (Scheme 2), see Figure 2 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 The shielding arc extinguishing device 3 includes an insulating shielding part 3-1, a positioning support part 3-3, a tension spring 3-4 and a positioning shaft pin 3-5, etc. The limiting device includes a limiting part 4 and a limiting guide rail 4-A, etc.; the original parts of the contactor mainly include a moving (the same as scheme 1) static contact 1, a moving contact bridge plate 2 and a moving contact 2-1, a traction slider 5, a bridge plate compression spring 6, an arc extinguishing chamber 7, a static contact support seat 8, a reset spring 9, an electromagnet 10, an electromagnet traction rod 11, a contactor housing 12, etc. The shielding member 3-1 (one piece) is mounted on the positioning support member 3-3 via a positioning pin 3-5. A roller 3-7 is mounted on the extended arm on one side of the insulating shielding member 3-1 via a pin 3-8. The roller 3-7 corresponds to the limit member 4 and the limit guide rail 4-A mounted on one side of the movable and static contact chambers of the contactor. A fixed pin 3-9 is mounted on the short arm on the other side of the insulating shielding member 3-1. A fixed pin 3-10 is also provided on the same side of the positioning support member 3-3. A tension spring 3-4 is mounted between the two fixed pins relative to the center line of the positioning pin 3-5. The insulating shielding member 3-1 can swing around the positioning pin 3-5 of the positioning support member 3-3. The power of the swing comes from the movement trajectory of the extended arm on the other side of the insulating shielding member 3-1 in the limit guide rail 4-A of the limit member 4 via the roller 3-7 caused by the left and right movement of the movable contact bridge plate 2. The insulating shielding member 3-1 swings forward or backward once, and the tension spring 3-4 can complete a process of stretching from top to bottom or from bottom to top to store energy and release energy. When shielding, the center line of the tension spring 3-4 crosses the center line of the positioning shaft pin 3-5 from top to bottom, and the opposite is true when opening.

[0061] The limiting guide rail 4-A can limit the angular position of the insulating shielding member 3-1 in shielding or opening. The positioning support member 3-3 is mounted and fixed above the moving contact bridge plate 2. The moving contact bridge plate 2 and the bridge plate compression spring 6 are installed in the traction slider 5. The bridge plate compression spring 6 acts between the moving contact bridge plate 2 and the traction slider 5 (to generate a certain contact overtravel and pressure after the moving and static contacts are closed). The limiting member 4 and the limiting guide rail 4-A are installed on one side of the moving and static contact chambers of the contactor. When the contactor is disconnected, the electromagnet 10 loses power, and the electromagnet traction rod 11 moves to the left under the action of the reset spring 9. At the same time, the insulating shielding part 3-1 swings counterclockwise with the positioning shaft pin 3-5 as the center under the action of the limit part 4 and the limit guide rail 4-A, and the tension spring 3-4 is stretched to store energy and release energy instantly, and is inserted between the moving contact 2-1 and the static contact 1, so that the moving and static contacts of the contactor are shielded, the arc is quickly cut off, stretched and extinguished, the arc extinguishing time is shortened, the arc is quickly extinguished and the contact burn is reduced. When the contactor is closed, the traction slider 5 generates a pulling force after the electromagnet 10 is energized, and the electromagnet traction rod 11 overcomes the action of the reset spring 9 (and stores energy at the same time), driving the traction slider 5 and the moving contact bridge plate 2 to move to the right. At the same time, the insulating shielding part 3-1 swings clockwise with the positioning shaft pin 3-5 as the center under the action of the limiting guide rail 4-A of the limiting part 4, and the tension spring 3-4 is stretched, stored in energy, and released in an instant, and quickly opens in the opposite direction of the moving contact bridge plate 2, and the moving and static contacts of the contactor complete the closing operation.

[0062] Obviously, the method of the present application can be used in various types of contactors.

[0063] In the shielding and arc extinguishing method for the contactor, the insulating shielding plate is made of an insulating material that is resistant to high temperatures and arcs.

[0064] The present application utilizes the movement stroke displacement of the moving contact bridge plate and the cooperation between the limit devices fixed on both sides (Scheme 1) or one side (Scheme 2) of the moving and static contact chambers to drive the shielding arc extinguishing device to operate. When the contactor is disconnected, the electromagnet loses power, and the moving contact bridge plate moves rapidly to the left through the traction slider and the electromagnet traction rod under the action of the reset spring. The moving and static contacts gradually open and generate an arc. At the same time, the shielding arc extinguishing device quickly operates to quickly isolate the moving and static contacts of the contactor through the insulating shielding member in the shielding arc extinguishing device, forcing the arc to be quickly cut off, elongated and extinguished, thereby achieving reliable disconnection of the contactor, thereby improving the contactor's ability to disconnect normal load current and effectively improving its electrical life.

[0065] On the contrary, when the contactor is closed, the electromagnet is energized and pulls the moving contact bridge plate to move rapidly to the right. The insulating shielding parts in the arc extinguishing device are quickly opened using the same principle to ensure that the moving and static contacts are reliably closed. The only difference is that the power at this time does not come from the action of the reset spring, but from the traction force of the electromagnet.

[0066] The shielding arc extinguishing method described in this application can achieve the following technical advancements after being applied to different types of contactor products:

[0067] 1. It can greatly improve the product's ability to break AC and DC load currents and increase its battery life;

[0068] 2. It can effectively solve the problem of difficulty in breaking DC critical load current;

[0069] 3. It can make some of the AC contactors currently produced and used in large quantities realize AC and DC compatibility.

[0070] A shielding arc extinguishing device for contactors is introduced below. The device specifically comprises: a shielding arc extinguishing device installed in the chambers of the moving contact and the static contact of the contactor.

[0071] The shielded arc extinguishing device is used to quickly isolate the moving contact and the static contact of the contactor when the moving contact and the static contact are disconnected and opened, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning. When the moving contact and the static contact of the contactor are closed, the insulating shielding part in the shielded arc extinguishing device is quickly opened to ensure that the moving contact and the static contact are reliably closed.

[0072] The shielding arc extinguishing device for the contactor contacts further comprises a limiting device installed in the chambers of the moving contact and the static contact of the contactor.

[0073] The limiting device is used to cooperate with the action stroke displacement of the moving contact bridge plate to drive the shielding arc extinguishing device to operate, so that the insulating shielding parts in the shielding arc extinguishing device can quickly isolate the moving contact and the static contact.

[0074] The shielded arc extinguishing device is specifically used to drive the shielded arc extinguishing device to operate by utilizing the cooperation between the action stroke displacement of the moving contact bridge plate and the limit device when the moving contact and the static contact of the contactor are disconnected and opened. The insulating shielding parts in the shielded arc extinguishing device quickly isolate the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning. When the moving contact and the static contact of the contactor are closed, the insulating shielding parts in the shielded arc extinguishing device are quickly opened to ensure that the moving contact and the static contact are reliably closed.

[0075] 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 the moving contact bridge plate, which is an original component of the contactor. The limit device is installed in the moving contact and static contact chambers, and can be installed on both sides or one side of the contact chamber.

[0076] The shielding arc extinguishing device is specifically used to quickly complete the energy storage and energy release of the tension spring in the shielding arc extinguishing device under the toggle action of the limit device by relying on the displacement of the moving contact bridge plate when the moving contact and the static contact of the contactor are disconnected and opened, so that the insulating shielding parts in the shielding arc extinguishing device can quickly shield and isolate the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning. When the moving contact and the static contact of the contactor are closed, the insulating shielding parts in the shielding arc extinguishing device are quickly opened to ensure that the moving contact and the static contact are reliably closed.

[0077] The limit device is installed within the chambers of the moving and stationary contacts. When installed on both sides of the chambers, the limit device includes a limit member and a limit block. When installed on one side of the chambers, the limit device includes a limit member and a limit guide. The specific schemes for the corresponding shielding arc extinguishing device for the contactor contacts are described in Schemes 1 and 2 above and will not be repeated here.

[0078] The various parts in this manual are described in a progressive manner, and each part focuses on the differences from other parts. The same or similar parts between the various parts can be referenced to each other.

[0079] The above description of the disclosed embodiments is intended to enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shielding arc extinguishing method for contactor contacts, characterized in that: A shielding arc extinguishing device is installed in the chambers of the moving contact and the static contact of the contactor. The shielding arc extinguishing device is installed on the moving contact bridge plate. The shielding arc extinguishing device is a shielding arc extinguishing device with a tension spring energy storage and energy release function. The moving contact bridge plate is an original component of the contactor. The limit device is installed in the chambers of the moving contact and the static contact; including: When the moving contact and the static contact are disconnected and opened, the displacement of the moving contact bridge plate and the toggle action of the limit device quickly complete the energy storage and energy release of the tension spring in the shielding arc extinguishing device, so that the insulating shielding member in the shielding arc extinguishing device quickly shields and isolates the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning; The model of the arc-extinguishing device is: The arc extinguishing device includes an insulating shielding member, a positioning support member, a tension spring and a positioning shaft pin, and the limiting device includes a limiting member and a limiting guide rail; wherein, the insulating shielding member is installed on the positioning support member through the positioning shaft pin, and a roller is installed on the extended arm on one side of the insulating shielding member through the shaft pin, and the roller corresponds to the limiting member and the limiting guide rail installed on one side of the moving and static contact chambers of the contactor, and a fixed shaft pin is provided on the short arm on the other side of the insulating shielding member, and a fixed shaft pin is also provided on the same side of the positioning support member. A tension spring is installed between two fixed pins relative to the center line of the positioning pin. An insulating shielding component swings around the positioning pin of the positioning support component. The power of the swing comes from the left and right movement of the moving contact bridge plate, which causes the extended arm on the other side of the insulating shielding component to move along the limit guide rail of the limit component through the roller. When an insulating shielding component swings forward or backward once, the tension spring can complete a process of stretching, storing energy, and releasing energy from top to bottom or from bottom to top. When shielding, the center line of the tension spring crosses the center line of the positioning pin from top to bottom, and the opposite is true when opening.

2. The method according to claim 1, characterized in that It also includes that when the moving contact and the static contact are closed, the insulating shielding member in the arc extinguishing device is quickly opened to ensure that the moving contact and the static contact are reliably closed.

3. A shielding arc extinguishing device for contactor contacts, characterized in that: The shielding arc extinguishing device is used to quickly complete the energy storage and energy release of the tension spring in the shielding arc extinguishing device under the toggle action of the limit device by relying on the displacement of the moving contact bridge plate when the moving contact and the static contact of the contactor are disconnected and opened, so that the insulating shielding member in the shielding arc extinguishing device quickly shields and isolates the moving contact and the static contact, forcing the arc to quickly stretch toward the arc extinguishing chamber and extinguish or enter the arc extinguishing chamber to cool and extinguish, shortening the arc extinguishing time, quickly extinguishing the arc and reducing contact burning; The arc-extinguishing device is installed in the chambers of the moving contact and the static contact of the contactor, and is installed on the moving contact bridge plate. The arc-extinguishing device is a shielding arc-extinguishing device with a tension spring energy storage and release function. The moving contact bridge plate is an original component of the contactor, and the limit device is installed in the chambers of the moving contact and the static contact. The model of the arc-extinguishing device is: The arc extinguishing device includes an insulating shielding member, a positioning support member, a tension spring and a positioning shaft pin, and the limiting device includes a limiting member and a limiting guide rail; wherein, the insulating shielding member is installed on the positioning support member through the positioning shaft pin, and a roller is installed on the extended arm on one side of the insulating shielding member through the shaft pin, and the roller corresponds to the limiting member and the limiting guide rail installed on one side of the moving and static contact chambers of the contactor, and a fixed shaft pin is provided on the short arm on the other side of the insulating shielding member, and a fixed shaft pin is also provided on the same side of the positioning support member. A tension spring is installed between two fixed pins relative to the center line of the positioning pin. An insulating shielding component swings around the positioning pin of the positioning support component. The power of the swing comes from the left and right movement of the moving contact bridge plate, which causes the extended arm on the other side of the insulating shielding component to move along the limit guide rail of the limit component through the roller. When an insulating shielding component swings forward or backward once, the tension spring can complete a process of stretching, storing energy, and releasing energy from top to bottom or from bottom to top. When shielding, the center line of the tension spring crosses the center line of the positioning pin from top to bottom, and the opposite is true when opening.

4. The arc extinguishing device according to claim 3, characterized in that: The shielding arc extinguishing device is also used to quickly open the insulating shielding parts in the shielding arc extinguishing device when the moving contact and the static contact are closed, so as to ensure that the moving contact and the static contact are reliably closed.

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