WO2024025383A1

WO2024025383A1 - Contact device having improved movable support holder

Info

Publication number: WO2024025383A1
Application number: PCT/KR2023/011033
Authority: WO
Inventors: 김홍기; 조현길; 이승민
Original assignee: 주식회사 와이엠텍
Priority date: 2022-07-28
Filing date: 2023-07-28
Publication date: 2024-02-01
Also published as: KR102493558B1

Abstract

According to an embodiment of the present invention, provided is a contact device having an improved movable support holder, the contact device comprising: a pair of fixed contacts for applying power; a movable contact bar in the form of a movable bar plate so as to be in contact with a pair of fixed contacts; a movable support yoke which is fixed to the lower portion of the movable contact bar and thereby fastened to the movable contact bar so as to move in conjunction with same; a contact pressure spring which is disposed below the movable contact bar and configured to provide contact pressure to the movable contact bar; and a shaft block that operates in conjunction with a movable iron core operated by the magnetomotive force generated from an excitation coil, and accommodates the contact pressure spring and the movable contact bar and limits the separation and operating distances thereof, wherein the movable yoke and the movable support holder are provided with a pair of yokes by an attractive force that suppresses an electron repulsion force generated against the current flowing in a pair of contact surfaces from a short-circuit current and an overcurrent flowing in the movable contact bar.

Description

Contact device with improved movable table holder

The present invention relates to a direct current switching contact device or contact device having an improved movable stand holder structure. More specifically, the present invention is designed to prevent opening, burning, welding, explosion, tremor, etc. of the contact point by the electromagnetic repulsion force generated on the contact surface of a pair of contact points when the short-circuit current or overcurrent flows through the movable contact zone and exceeds the limit of the contact pressure spring. It relates to a switch contact device having a structure capable of securing stronger short circuit resistance that can prevent short circuits.

The contact device can be used in direct current transportation systems such as electric vehicles, hybrid vehicles, hydrogen fuel cell vehicles, solar power generation, energy storage devices, fast charging devices, and uninterruptible power supplies.

Meanwhile, the use of lithium-ion batteries is rapidly expanding throughout the industry due to environmental problems such as global warming. As capacity increases, there is a need for a method to safely separate the battery and load from short-circuit loads of the battery. Battery fires can occur due to overheating, welding, and deterioration of the relay's current-carrying contacts due to abnormal overcurrent, such as a short-circuit accident. Due to the nature of the battery, it is difficult to extinguish the fire, which can cause significant property and human damage.

Typically, the short-circuit current of a lithium-ion battery is dozens of times the rated current, and as a safety device to protect the battery, a circuit breaker, fuse, etc. can be placed in front of the DC high-voltage relay. Such circuits can be safely blocked with breakers and fuses to prevent battery explosions and safely disconnect power from the load. However, if the DC high-voltage relay placed at the rear of the safety device cannot withstand the overcurrent, the battery and load from the safety device will not be protected, which may lead to fire, burnout, explosion, etc. In addition, since direct current power has no zero point, it is difficult to cut off the power. In particular, short-circuit current in lithium-ion batteries carries risks such as fire and explosion, so the opening and closing of the main contact point is accurately controlled, and the battery is safely controlled in case of short-circuit accidents, etc. to prevent overcurrent. A method to ensure reliability of strength is needed.

Also, impacts and collisions of electric vehicles. The current-carrying contact part of the DC high-voltage contact switching device applied to DC power control and battery power control, such as explosion and fire of renewable energy storage devices, operates in response to short circuit and overcurrent of the battery, and is a movable contact due to overcurrent flowing in the movable contact zone. If the contact pressure of the spring exceeds the limit value, electromagnetic repulsion occurs between the fixed contact and the movable contact against the direction of the flowing current, so a device structure that suppresses this is required.

Accordingly, the contacts of the contact device must be able to withstand short-circuit current, and as battery capacity increases, a contact device with a stronger short-circuit capacity than before is required.

The purpose of the present invention is to provide a contact device with improved short-circuit resistance to prevent accidents due to electromagnetic repulsion that is difficult to handle with a contact pressure spring for short-circuit current and overcurrent.

In addition, the present invention allows the movable table yoke of the movable contact assembly to exert a strong attractive force toward the upper movable table holder in proportion to the abnormal current against the electromagnetic repulsion force, so that the electromagnetic repulsion force generated at the contact surface of the contact point when a short circuit current or overcurrent occurs. By overcoming the contact pressure of the contact point, maintaining the contact pressure of the contact point, and suppressing the backlash of the contact surface of the movable contact point, the risk of contact opening, burnout, welding, explosion, vibration, etc. is reduced, and a contact device that can prevent accidents due to contact opening is provided. The purpose is to provide

In addition, in the present invention, the movable table holder is made of a non-magnetic material to eliminate the magnetic yoke fixed to the central part by welding, etc., and the movable table holder capable of storing the movable contact table is made of a magnetic material, eliminating the inconvenience of arranging a separate magnetic material. By removing the material of the upper layer of the movable stand holder and increasing the volume into multiple layers by bending both sides, the magnetic saturation is reduced and the magnetic attraction force is doubled, thereby eliminating the process of welding or additional attachment of a separate magnetic material, making it possible to eliminate the contact point. The purpose is to provide cost reduction and productivity improvement of the device.

In addition, the present invention includes a movable yoke of a magnetic material fixedly arranged in a structure surrounding the movable contact zone in a U-shape at the center of the movable contact zone when an overcurrent or short-circuit current passes, and a movable iron core that moves by magnetic force generated by the application of power to the electromagnet. The magnetic flux generated from the holder yoke made of interlocked magnetic materials exerts a strong attractive force, and the lower movable yoke placed on the lower side of the movable contact point is directed to the left and right sides of the movable table holder and the upper side of the movable table holder made of multiple layers. The purpose is to safely protect the battery power from short-circuit loads and cooperate in protecting the system by designing a structure that exerts an attractive force to prevent contact burnout, welding, and explosion due to contact vibration or separation.

In addition, the present invention relates to a contact device using the principle of an electromagnet, where the electromagnetic repulsion force (Fr) generated against the direction of current flow and the contact contact surface is converted into a fixed contact point by using the current (I) flowing through the main contact point. The purpose is to provide a method and device for improving the contact force (F1+F2) of contact.

The problems to be solved by the present invention are not limited to the contents mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

According to one embodiment of the present invention, the improved movable table holder is a contact device having a ∩ shape, a pair of fixed contacts for applying power, and a movable bar to contact the pair of fixed contacts. A plate-shaped movable contact base, a movable base yoke fixed to the lower part of the movable contact base, fixed to the movable contact base, and configured to move in conjunction with the movable contact base; a contact pressure spring disposed below the movable contact zone and configured to provide contact pressure to the movable contact zone; and a shaft block that operates in conjunction with a movable iron core operated by magnetomotive force generated from the excitation coil, wherein the movable table yoke is made of a magnetic material, and the movable table yoke is configured to extend in a vertical direction from the center of both sides. By including a pair of extension parts, the movable table yoke has a U-shape, the pair of extension parts of the movable table yoke are fixedly disposed at the center of the movable contact band, and the shaft block is an insulating block made of an insulating material. It includes a shaft inserted into an insulating block and a movable table holder disposed on an upper part of the insulating block and made of a magnetic material, wherein the movable table holder has an ∩ shape with an upper part and both side parts, and the movable table holder and the insulating block. It is possible to provide a contact device that accommodates the contact pressure spring and the movable contact base through the space therebetween.

In addition, the method of claim 1, wherein a pair of protruding curved portions configured to protrude outwardly through both sides of the insulating block are formed at one end of each lower side of the movable table holder, and the movable table holder is formed at one end of each lower side of the movable table holder. It can be fixedly coupled to the insulating block through the curved portion.

Additionally, the upper layer of the movable table holder may be made of a magnetic material having a plurality of layers.

Additionally, the upper layer of the movable table holder can form a plurality of layers by lamination through bending in both directions without cutting the bar-shaped upper surface formed on the upper part of the movable table holder.

Additionally, the shaft block is formed as one piece by insert molding the shaft and the movable table holder as one piece.

In addition, the contact device can be airtightly bonded to a ceramic housing or epoxy-based device to enclose an insulating gas or be used in a contact device that opens and closes in the air.

According to the present invention, it is possible to provide a contact device with improved short-circuit resistance to prevent accidents due to the electromagnetic repulsion force caused by short-circuit current and overcurrent, which is difficult to handle with a contact pressure spring.

In addition, according to the present invention, against the electromagnetic repulsion force, the movable table yoke of the movable contact assembly exerts a strong attractive force toward the upper movable table holder in proportion to the abnormal current, thereby preventing the friction generated at the contact surface of the contact point when a short circuit current or overcurrent occurs. By suppressing the electromagnetic repulsion force, it is possible to provide a contact device that can reduce the risk of contact opening, burnout, welding, explosion, vibration, etc., and prevent accidents due to contact opening.

In addition, according to the present invention, the upper yoke that is separately fixedly disposed is removed, the movable table holder that accommodates the movable contact base is made of a magnetic material, thereby eliminating the inconvenience of arranging a separate magnetic material, and the material of the upper layer of the movable contact point unit is eliminated. By increasing the volume into multiple layers by bending both sides without cutting, reducing magnetic saturation and doubling the magnetic attraction force, the process of welding or additional attachment of a separate magnetic material can be eliminated, thereby reducing the cost of the contact device and improving productivity.

In addition, according to the present invention, as a contact device using the principle of an electromagnet, the electromagnetic repulsion force (Fr) generated against the contact contact surface in the direction of current flow is converted into a fixed contact by using the current (I) flowing through the main contact point. A method and device for improving the contact force (F1+F2) contacting can be provided.

The effects of the present invention are not limited to the contents mentioned above, and other effects not mentioned will be clearly understood by those skilled in the art from the description below.

1 is a cross-sectional view illustrating a configuration showing an open state of a contact device according to an embodiment of the present invention.

Figure 2 is a cross-sectional view for explaining a configuration showing a closed state of a contact device according to an embodiment of the present invention.

Figure 3a is a diagram for explaining the configuration of a shaft block including a movable table holder according to an embodiment of the present invention. Figure 3b is a diagram for explaining the configuration of a movable contact assembly according to an embodiment of the present invention.

Figure 4 is a diagram for explaining the configuration of an airtight contact device according to an embodiment of the present invention.

Figure 5 is a diagram for explaining the electromagnetic repulsion force (Fr), contact pressure (F1), and attraction force (F2) of the direct current contact device according to an embodiment of the present invention.

Figure 6 is a diagram for explaining the attractive force generated during a short circuit or abnormal current of a direct current contact device according to an embodiment of the present invention.

Hereinafter, with reference to the attached drawings, the present invention will be described in detail so that those skilled in the art can easily practice it. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein.

The terminology used herein is for describing embodiments and is not intended to limit the invention. As used herein, singular forms also include plural forms, unless specifically stated otherwise in the context.

As used herein, “comprises”, “comprising” refers to the presence or absence of one or more other components, steps, operations and/or elements. Addition is not ruled out.

Additionally, terms including ordinal numbers, such as first, second, etc., used in the present invention may be used to describe components, but the components should not be limited by the terms. These terms are used only to distinguish one component from another. Additionally, when describing the present invention, if it is determined that a detailed description of related known technologies may obscure the gist of the present invention, the detailed description will be omitted.

Additionally, the component parts appearing in the embodiments of the present invention are shown independently to show different characteristic functions, and this does not mean that each component is made of a separate structural unit. That is, for convenience of explanation, each component is listed and described as each component, and at least two of each component may be combined to form one component, or one component may be divided into a plurality of components to perform a function. Integrated embodiments and separate embodiments of each of these components are also included in the scope of the present invention as long as they do not deviate from the essence of the present invention.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the attached drawings. The configuration of the present invention and its operational effects will be clearly understood through the detailed description below.

1 is a cross-sectional view illustrating a configuration showing an open state of a direct current contact device according to an embodiment of the present invention.

Referring to FIG. 1, the configuration and assembly method of the direct current contact device according to an embodiment of the present invention will be described. The coil 11 is wound on the bobbin 10, and the start line of the electronic coil winding portion is connected to the coil terminal 12. An electromagnet can be made by connecting the end lines, and an electromagnet can be made by inserting the through core (13) into the groove inside the center of the bobbin (10).

There is a movable contact base 14 in the form of a rod or bar that operates as a movable contact point, and the shaft 16 and the movable base holder 29 are formed by insert injection molding into the insulating block 15-1. ) and integrally form the shaft block 15, the lower part of the movable table holder 29 is made of insulating material, and the contact pressure spring 18 is installed inside the insulating block 15-1 of the shaft block 15. The movable contact assembly 19 consisting of the movable contact base 14 and the movable base yoke 28 can be accommodated and assembled.

In addition, after assembling the arc base (21), the yoke plate (22), the fixed iron core (23), the return spring (20), and the movable iron core (24) arranged in the center of the yoke plate (22) in order, the O/O of the contact point By adjusting T (Over travel), the semi-finished product can be completed by completely fixing it. In addition, the shield cup 27 is airtightly bonded to the ceramic housing 25 made of ceramic material along with a pair of fixed contact points 30 and 31, and the shield cup 27 is bonded to the yoke plate 22 to form an airtight contact. A direct current high voltage switching device can be completed by sealing an insulating mixed gas mainly containing gas such as hydrogen inside the box.

The present invention relates to the suppression of electromagnetic repulsion against the direction of the current at the contact surface of a fixed contact and a movable contact when a short circuit current or overcurrent occurs. The contact surface is opened due to vibration of the contact surface due to a short circuit current or abnormal overcurrent. To reduce the risk of burnout, welding, explosion, etc., and to combat electromagnetic repulsion, the movable yoke (28) of the movable contact assembly (19) is arranged to surround the center of the width of the movable contact zone in a U-shape and is fixed to the movable contact zone. The upper part of the movable table holder (29-1) is integrated and has a laminated structure by overlapping the left and right sides of the ∩-shaped upper part (29-1), which provides a strong suction force in proportion to the current flowing through the movable contact point (14). It is adsorbed and can improve short-circuit resistance for the purpose of preventing accidents due to vibration (chartering) of the contact due to the electromagnetic repulsion force generated at the contact surface of the fixed contact and the movable contact.

In the present invention, the movable table yoke (28) is arranged on the lower side of the movable contact table (14) in a U-shape to surround the lower side of the movable contact table (19), the movable contact assembly (19) is stored, and when a short circuit current occurs, the movable table yoke (28) is arranged in a U-shape to surround the lower side of the movable contact table (19). Movement made by overlapping several layers through a plurality of layers (layers) structure of the movable table holder 29 and the upper layer 29-1 of the movable table holder 29, which forms a magnetic path of the electromagnetic force generated in the yoke 28. By using a magnetic material structure that makes the attractive force more powerful in proportion to the volume of the magnetic material of the large holder upper layer (29-1), when a short-circuit current is passed through the movable contact assembly (19), a strong attractive force is exerted to absorb the electron repulsion force and electronic It is possible to increase the short-circuit resistance of the structure that prevents the opening of the contact point against the repulsive force.

The short-circuit current and abnormal overcurrent that enter the first fixed contact point 30, pass through the movable contact assembly 19, and go out to the second fixed contact point 31 move the U-shaped magnetic body disposed in the movable contact assembly 19. The stand yoke (28) is arranged in close contact with the bottom of the movable contact base (14), and the electromagnetic attraction force generated by the short-circuit current in the movable base yoke (28) induces rotation of magnetic flux to the movable base holder (29), and the movable base yoke (28) rotates the magnetic flux. The direct attraction force from the holder 29 is directly transmitted to the upper layer of the movable table holder (29-1) and passes through the gap of the magnetic material to form a constant closed circuit. The closed circuit is formed by short-circuit current at the contact portion between the movable contact table 14 and the fixed contact point. It is possible to achieve a contact device with increased short-circuit resistance that exerts an attractive force that absorbs the electromagnetic repulsion force generated against it.

The configuration in FIG. 2 shows a closed state in which a pair of fixed contact points 30 and 31 are in contact with the movable contact base 14, and the other configuration is the same as that in FIG. 1.

The operating power of the excitation coil 11 is applied to the coil terminal 12 extending from the excitation coil 11, and the movable core 24 moves to the fixed core 23 according to the principle of an electromagnet. The insulating block (15-1), which is made for the purpose of seating the movable table holder (29) and the contact pressure spring (18) and insulating the main contact point, is made into one piece by insert injection, and the shaft (16) that is insert-injected as one piece is a movable iron core. It is fixed to (24), and the movable contact assembly 19 and the contact pressure spring 18, in which the movable contact base 14 and the movable base yoke 28 are combined, can be inserted and assembled inside the movable table holder 29.

When the coil operation power supply is connected, the electromagnet part is excited, and the magnetic flux formed by the excitation flows from the yoke 26 surrounding the outside of the coil to the movable iron core 24, and from the movable iron core 24 to the yoke plate ( 22) moves to the fixed iron core 23 in the central part to form a magnetic path, and the movable iron core 24 moves upward by generating an attractive force to the fixed iron core 23 fixed to the upper side, and the movable iron core (24) 24), the shaft block 15 is moved upward so that the movable contact point 14 contacts the pair of fixed contact points 30 and 31 to make an electrical connection.

Conversely, when the power to the excitation coil 11 is cut off, the magnetic flux disappears and the movable core 24 is separated from the fixed core 23 by the repulsion force of the contact pressure spring 18 and the return force of the return spring 20, and the contact point is separated from the fixed core 23. It opens and blocks electrical conduction.

First, referring to FIG. 3A, the shaft block 15 operating in conjunction with the movable iron core 24 includes an insulating block 15-1 made of an insulating material, a shaft 16 inserted into the insulating block 15-1, and insulating material. It may include a movable table holder 29 disposed on the upper part of the block 15-1 and made of a magnetic material such as a magnetic material or an electronic soft iron plate.

Here, the movable table holder 29 has a ∩ shape to have an upper surface and both sides, and the contact pressure spring 18 and the movable contact point are provided through the space between the movable table holder 29 and the insulating block 15-1. It may be configured to accommodate (14). A protruding curved portion 29-2 is formed at one end of each side of the movable table holder 29 to penetrate both sides of the insulating block 15-1 and protrude outward, and the movable table holder 29 This protruding curved portion minimizes the friction that occurs when the insulating block 15-1 and the arc base 21 slide against each other, prevents wear, and increases the lifespan of the operation.

The upper layer 29-1 of the movable table holder 29, which forms the upper surface of the movable table holder 29, may be composed of a magnetic material having a plurality of layers, and as shown in the reference drawing above in FIG. 3, the movable table holder (29-1) 29), a plurality of layers are formed by bending in both directions without cutting the upper surface of the bar shape formed integrally with the movable table holder 29) to form, for example, 3 layers, thereby reducing the volume of the magnetic material to 3. It can be doubled. For example, on the upper surface of the movable table holder 29, a long bar-shaped raw material is bent upward without cutting to form one layer, and on the other side, another layer is formed on top of the first overlapped area. Layers can be overlapped to form layers. At this time, the length of the upper surface of the movable table holder 29 may be more than three times the vertical width of the movable table holder 29, and then the three-layer layer may be formed through two bending operations. When implemented with a general press mold, the cost is excessive, the length of the mold is long, and it is inefficient due to its complex shape. However, the production of the above layered structure without cutting requires a multi forming machine, progressive, and transfer. The processing method reduces costs and makes it easy.

The multiple laminated structure of the upper layer of the movable table holder (29-1) reduces magnetic saturation and increases suction force, thereby ensuring stronger short-circuit resistance. With this configuration, in the event of a short circuit current, the movable table yoke 28 disposed below the center of the movable contact table 14 generates a strong suction force to the fixedly arranged upper movable table holder 29 and creates a ∩-shaped The movable stand holder (29) reduces loss by minimizing the magnetic path gap in order to increase the magnetic field efficiency, and is placed on the lower side of the movable contact stand (14) when the movable contact stand (14) moves toward the fixed contact points (30, 31). The movable table yoke (28) can increase the volume of the magnetic material through both sides of the left and right movable table holders (29) and the upper part of the movable table holder (29-1) to increase the magnetic saturation and increase the attractive force. there is.

Additionally, the shaft block 15 may be formed by insert molding the shaft 16 and the movable table holder 29 into an insulating block 15-1 made of an insulating material.

Referring to FIG. 3B, the movable yoke 28 made of a magnetic material includes a pair of extension parts extending vertically from the center of both sides, and when viewed from the front in the longitudinal direction of the movable yoke 28, U It may have a ruler shape, and a pair of vertical extensions of the movable base yoke 28 may be fixedly disposed and coupled to grooves on both sides of the center of the movable contact base 14. The movable table yoke 28 may be configured to wrap around both vertical surfaces of the width end of the movable contact table 14 and extend in a bending manner by wrapping it to a height close to the thickness of the movable contact table 14. In this way, the form in which the movable contact base 14 and the fixedly arranged movable base yoke 28 are combined is referred to as a movable contact assembly 19.

The airtight contact device according to an embodiment of the present invention includes a ceramic housing 25 and a pair of fixed contact points 30 and 31 disposed on the upper side of the ceramic housing 25, and a shield cup at the lower part of the ceramic housing 25. (27) is hermetically bonded, and the shield cup 27 may be formed by hermetically bonded to the yoke plate 22.

The movable contact assembly 19, shaft block 15, movable iron core 24, and fixed iron core 23 are arranged in an airtight space by means of a cylinder 17. This airtight space can be completely blocked from the outside air by vacuuming the inside and sealing it with an electrically insulating arc extinguishing gas such as hydrogen. In this way, the fixed

contacts

30 and 31 are hermetically bonded based on the ceramic housing 25, an insulating gas is sealed inside the airtight contact device, and a magnetic field is applied to the inside and outside of the contact with a permanent magnet to induce an arc. Contact devices can be manufactured for the purpose of inducing and spreading the arc.

Figure 5 is a diagram for explaining the electromagnetic repulsion force (Fr), contact pressure (F1), and attraction force (F2) of the contact device according to an embodiment of the present invention.

Referring to the left drawing of FIG. 5, when a current flows through a contact, an electronic repulsion force (Fr) is generated against the contact surface in the direction of current flow, and this electronic repulsion force (Fr) is equal to the size of the current (I). When an abnormal current such as a short-circuit current occurs in proportion to the electromagnetic repulsion force (Fr), the contact portion of the movable contact band 14 that contacts and energizes the pair of fixed

contacts

30 and 31 causes opening, welding, burnout, explosion, Accidents may occur due to shaking.

At normal current, the electromagnetic repulsion force (Fr) can be suppressed only by the contact pressure (F1) of the contact pressure spring (18) disposed at the lower part of the movable contact base (14), but when a short-circuit current occurs, the electromagnetic repulsion force is applied to the contact pressure spring (18). It cannot be suppressed with contact pressure (F1) alone. To suppress this problem, it can be solved by increasing the capacity of the electromagnet and increasing the pressure of the contact pressure spring. However, this leads to an enlarged product and increases power consumption and weight, making it unsuitable for controlling electric vehicles and renewable energy power sources. In addition, if the contact pressure spring is arranged in the current structure, the risk of overheating, welding, fire, or explosion may occur due to opening of the contact point in the event of an abnormal current or short-circuit load accident.

Typically, the short-circuit current of the battery is several tens of times the rated current, and circuit breakers and fuses are placed in front of the DC high-voltage relay as safety devices to protect the battery. These circuits can be safely blocked with circuit breakers and fuses to prevent battery explosion and safely separate the battery power source from the load. However, if the DC high-voltage relay placed at the rear of the safety device cannot withstand the overcurrent, the battery and load from the safety device will not be protected, which may lead to fire, burnout, explosion, etc. Accordingly, the relay contacts must be able to withstand short-circuit current. As battery capacity gradually increases, strengthening short-circuit capacity tolerance becomes more and more important.

Referring to the right drawing of FIG. 5, the contact device according to the present invention closes the circuit by contacting the first fixed contact point 30 and the second fixed contact point 31, where the movable contact stand 14 is arranged as a pair. In the structure, when an abnormal overcurrent or short-circuit load occurs, the movable table yoke 28 disposed at the center of the movable contact table 14 is magnetized, and an attractive force (F2) is generated toward the movable table holder 29 due to the magnetization of the movable table yoke 28. ) is generated, thereby offsetting the electronic repulsion force (Fr) proportional to the size of the current (I), and safely maintaining and protecting the battery power from the short-circuit load of the lithium-ion battery. Here, the attraction force (F2) is generated from the movable contact band 14 toward the contact portions (40a, 40b) of the pair of fixed contact points (30, 31), and this attraction force (F2) is applied to the contact portion that causes the electromagnetic repulsion force (Fr). By acting as a pushing force against (40a, 40b), opening of the movable contact band 14 due to the electromagnetic repulsion force (Fr) can be prevented.

In this way, when a short-circuit current passes through the movable base yoke 28 made of a magnetic material that surrounds the lower part of the movable contact base 14, a magnetic field is generated around the movable contact base 14 and the movable base yoke 28 surrounds the outside. The magnetic flux rotates to the movable base holder (29), generating an attractive force toward the contact surface of the fixed contact points (30, 31), thereby suppressing the electromagnetic repulsion force generated at the contact surface of the fixed contact points (30, 31) and the movable contact base (14). You can.

In addition, the electromagnetic repulsion force (Fr) generated against the contact contact surface in the direction of current flow is used to reduce the contact force with which the movable contact base 14 contacts the fixed contact points 30 and 31 by using the current (I) flowing through the main contact point. By improving F1 (contact pressure) + F2 (attractive force), the electromagnetic repulsion force (Fr) from abnormal overcurrent and short-circuit load can be overcome.

This attraction force (F2) is generated by the movable contact band 14, which is electrically connected by contacting a pair of fixed contact points 30 and 31, toward the

contact portions

40a and 40b of the fixed contact points 30 and 31. This is happening. This attractive force (F2) acts as a force pushing against the contact portions (40a, 40b) that cause the electromagnetic repulsion force (Fr) to prevent the opening of the movable contact point (14) due to the electromagnetic repulsion force (Fr). You can.

In particular, the movable contact table 14 and the movable table yoke 28 made of a magnetic material are fixedly disposed, and the movable table holder 29 made of a magnetic material is formed as one piece, and the movable table holder upper layer 29-1 is formed without cutting the material. By bending and overlapping in three layers to form multiple layers, the volume of the magnetic material can be increased by three times, and magnetic loss can be minimized by minimizing the gap between the upper and lower attraction forces.

Figure 6 is a diagram showing the arrangement relationship of the movable table yoke, the movable table holder, and the movable contact table to explain the attractive force generated during a short circuit or abnormal current of the direct current contact device according to an embodiment of the present invention.

Referring to FIG. 6, that is, when an abnormal current such as a short circuit current occurs, the U-shaped movable table yoke 28 fixed to the lower part of the movable contact table 14 and the movable contact table 14 oppose the movable table yoke 28. ), the magnetic flux rotating around the movable contact assembly 19 is caused by the flow of magnetic flux generated between the ∩-shaped movable table holders 29 arranged to surround the upper part of the movable table yoke 28 fixed to the lower side. ) is generated in a straight line direction toward the movable table holder 29 and the upper layer 29-1 of the movable table holder composed of a plurality of layers, that is, toward the fixed contact points 30 and 31. As shown in Figure 6, when viewed from the front in the longitudinal direction of the movable contact base 14, the inner space of the ∩-shaped movable base holder 29 includes a movable base yoke 28 and a movable contact base 14. It can be seen that the movable contact assembly 19 is received and disposed.

More specifically, the movable iron core 24 moves toward the fixed iron core 23 using the magnetomotive force of the electromagnet, and the shaft block 15, which moves up and down in conjunction with the movable iron core 24, is assembled inside the movable table holder 29. It is a direct current high voltage contact device with a structure in which the movable contact assembly 19 closes the circuit by contacting the first fixed contact point 30 and the second fixed contact point 31 arranged in pairs on the left and right sides, and the rated current and overload In this case, the contact pressure (F1) of the contact pressure spring (18) can overcome the electromagnetic repulsion force (Fr), and when an abnormal overcurrent or short-circuit load occurs, the movable base yoke (28) disposed at the center of the movable contact base (14) is magnetized. , the magnetized attractive force exerts a strong attractive force (F2) toward the movable table holder 29 and the upper part 29-1 of the movable table holder, which increases the volume of the magnetic material by overlapping three sheets of the material of the movable table holder without cutting, and the current By canceling out the electronic repulsion force (Fr), which is proportional to the size of (I), the battery power can be safely maintained and protected from the short-circuit load of the lithium-ion battery.

This strongly strengthens the short-circuit resistance of the structure that prevents vibration, separation, welding, burnout, and explosion of the contact area of the movable contact bar (14), which contacts and energizes a pair of fixed contact points (30, 31) with electromagnetic repulsion force (Fr). It is a structure that increases. More specifically, when the current (I) flows through the movable contact zone 14 between the movable table yoke 28, the movable table holder 29, and the movable table holder upper layer 29-1, the movable table is used to pass the magnetic flux. Magnetization of the yoke 28 generates an attractive force, and the attractive force F2 directed to the fixed movable table holder 29 generates a force that pulls the yoke 28 into the gap between them.

Referring to FIG. 6, the upper part of the movable table holder 29-1 is configured to additionally overlap a plurality of layers on the upper surface of the basic movable table holder 29 to increase the volume to reduce magnetic saturation. Accordingly, a plurality of rulers are formed along each layer additionally laminated on the basic upper layer according to the U-shaped movable table yoke, the basic upper layer of the ∩-shaped movable table holder 29, and the upper layer of the movable table holder 29-1. It can be configured to form.

Through this configuration and operation, accidents due to electromagnetic repulsion force (Fr) that is difficult to handle with the contact pressure spring 18 for abnormal overcurrent and short-circuit load are prevented, and direct current high voltage power, which is a battery power source and new renewable energy source, is safely used in the direction of current. Regardless, it is possible to provide a contact device with increased short-circuit resistance for the purpose of safely controlling against overload.

The embodiments disclosed in the specification of the present invention are merely examples, and the present invention is not limited thereto. The scope of the present invention should be interpreted in accordance with the scope of the patent claims below, and all technologies within the equivalent scope thereof should be interpreted as being included in the scope of the present invention.

Claims

In a contact device with an improved movable table holder,

a pair of fixed contacts for applying power;

a movable contact base in the form of a plate that can be moved to contact the pair of fixed contact points;

A movable table yoke made of a magnetic material to be fixed to the lower part of the movable contact table and move integrally with the movable contact table;

It is fixedly disposed at the lower part of the movable contact zone and is disposed inside the circular groove of the movable yoke to prevent separation. a contact pressure spring configured to provide contact pressure to the movable contact member; and

A shaft block that operates in conjunction with a movable iron core operated by the magnetomotive force generated from the excitation coil.

Including,

The movable table yoke is configured to wrap around both vertical surfaces of the width end of the movable contact band and extend by bending to a height corresponding to the thickness of the movable contact band.

The shaft block includes an insulating block made of an insulating material, a shaft inserted into the insulating block by insert molding, and a movable table holder disposed on an upper part of the insulating block, made of a magnetic material, and having a ∩ shape.
The method of claim 1, wherein a pair of protruding curved portions configured to protrude outward through both sides of the insulating block are formed at one end of each side portion of the movable table holder, and the movable table holder is located on a lower side of the protruding curved portion. A contact device that is fixedly coupled to the insulating block by insert injection.
The method of claim 1, wherein the upper part of the movable table holder is composed of a plurality of overlapping layers to increase the volume to reduce magnetic saturation, and the movable table yoke, the movable table holder, and the upper part of the movable table holder. A contact device configured to form a plurality of magnetic paths through each layer.
The method of claim 3, wherein the upper layer of the movable table holder is formed by stacking the upper part of the movable table holder in a bent shape by bending in both directions, left and right, without cutting the material, thereby forming a plurality of layers. In, contact device.
The contact device according to claim 1, wherein the shaft block is formed by insert molding the shaft and the movable table holder as one piece or surrounds the movable contact table.
The contact device according to claim 1, wherein the contact device is airtightly joined based on a ceramic housing and epoxy molding, and the inside of the airtight contact device is filled with an insulating gas or opened and closed in the air.