A high-voltage DC relay capable of extinguishing arcs

Abstract

The present invention discloses a high-voltage DC relay capable of extinguishing arcs, comprising a base, a magnetic circuit portion, movable and stationary contacts, a push-clip, an armature, and a grid arc-extinguishing device. The grid arc-extinguishing device is movably mounted at the midline of the gap between the movable and stationary contacts. A portion of the armature engages with the pole face of the magnetic circuit portion, one end of the armature is connected to the push-clip, and the other end of the armature is linked to the grid arc-extinguishing device. When the movable and stationary contacts separate, the grid arc-extinguishing device enters the gap between the movable and stationary contacts to cut the arc and extinguish the arc. When the movable and stationary contacts are in contact, the grid arc-extinguishing device moves out of the gap to avoid interfering with the contact between the movable and stationary contacts. The present invention has the advantages of being relatively small in size, simple in structure, good arc-extinguishing effect, easy to manufacture, and capable of switching high-voltage and high-current loads.

Description

Technical Field

[0001] The present invention relates to the field of relay technology, and in particular to an arc-extinguishing high-voltage DC relay suitable for photovoltaic power generation, new energy vehicle charging piles, 5G networks and other fields. Background Art

[0002] Electromagnetic relays are electromechanical components widely used in various household appliances, office equipment, and industrial control systems. They typically consist of a contact system, a magnetic circuit system, a housing, and a base. High voltage (DC voltage up to 400VDC and above) and high current (current over 100A) are particularly common in recent years, particularly in photovoltaic power generation, new energy vehicles, and 5G networks. Traditional relays cannot meet these requirements.

[0003] For applications such as traditional power supplies, photovoltaic inverters, and HVDC power supplies, the currents involved are only tens of amperes, and the voltages peak at around 400VDC. Adding a magnetic arc blower near the relay contacts can meet these requirements. However, the rapid rise of new energy vehicles and network communication technologies in recent years has necessitated relays with higher load capacities to effectively interrupt circuits. This presents a dilemma for system manufacturers, leaving them with bulky and expensive vacuum interrupter relays and circuit breakers. However, vacuum interrupter relays are complex, costly, bulky, and pose a risk of explosion.

[0004] One existing DC relay method for achieving arc extinguishing uses a magnet near the contacts (i.e., the moving and static contacts). This magnet blows the arc, stretching the arc and accelerating its extinguishing. However, this method is generally suitable for relays with relatively low load voltages and currents and is not suitable for high-voltage (DC voltages up to 400 VDC or higher) and high-current (currents over 100 A) loads. Another existing DC relay method for achieving arc extinguishing uses a fixed arc-extinguishing grid installed near the contacts (i.e., the moving and static contacts), similar to the fixed arc-extinguishing grids in circuit breakers. These grids are made of thick iron sheets and require the arc to be drawn into the grid and cut into short series arcs to achieve arc extinguishing. However, actual verification shows that the arc cannot fully enter the grid, resulting in unsatisfactory arc extinguishing results. Summary of the Invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a high-voltage DC relay that can extinguish arcs, which has the characteristics of relatively small size, simple structure, good arc extinguishing effect, easy manufacturing, and can realize high voltage and high current load switching.

[0006] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage DC relay capable of extinguishing arcs, comprising a base, a magnetic circuit portion, movable and static contacts, a push card and an armature; the movable and static contacts and the magnetic circuit portion are respectively mounted at corresponding positions on the base; the armature cooperates with the magnetic circuit portion, and the push card is connected between the movable contact and the armature; the relay also includes a grid arc extinguishing device; the grid arc extinguishing device is movably mounted at the midline position of the gap between the movable contact and the static contact, and a portion of the armature is aligned with the iron core of the magnetic circuit portion. The pole faces are matched, one end of the armature is connected to the push card, so that when the armature is actuated, the push card is driven to move back and forth along the first direction, so that the moving and static contacts are contacted or separated in the first direction, and the other end of the armature is linked to the grid arc extinguishing device, so that the grid arc extinguishing device is moved back and forth along the second direction perpendicular to the first direction, so that when the moving and static contacts are separated, the grid arc extinguishing device enters the gap between the moving and static contacts to cut the arc and realize arc extinguishing, and during the contact process of the moving and static contacts, moves out of the gap between the moving and static contacts to avoid interfering with the contact of the moving and static contacts.

[0007] The armature is V-shaped, one side of the V-shape of the armature serves as a part of the armature and cooperates with the pole surface of the iron core of the magnetic circuit part, the end of one side of the V-shape is connected to the push card, and the other side of the V-shape of the armature is linked to the grid arc extinguishing device.

[0008] The other side of the V-shape of the armature is provided as a swing arm, and the grid arc extinguishing device can be slidably fitted on the base in a guided manner. The grid arc extinguishing device is provided with a first matching groove, and the end of the swing arm is movably fitted in the first matching groove to convert the swinging motion of the swing arm of the armature into the guided motion of the grid arc extinguishing device along the base.

[0009] The V-shaped included angle of the armature is an acute angle. The armature is installed in the base through a restoring spring and cooperates with the magnetic circuit part.

[0010] In the base, a first sliding groove along the second direction is provided at a moving position corresponding to the grid arc extinguishing device, and the grid arc extinguishing device is provided with a first protrusion. The first protrusion of the grid arc extinguishing device is slidably fitted in the first sliding groove of the base to realize the guided movement of the grid arc extinguishing device in the base.

[0011] Furthermore, it also includes a metal rocker arm, the head of the metal rocker arm is covered with a plastic body by injection molding, the end of the plastic body is provided with a cylindrical structure, and the tail of the metal rocker arm is fixed to the end of the swing arm of the armature by riveting; the cylindrical structure of the plastic body is fitted in the first fitting groove of the grid arc extinguishing device.

[0012] The grid arc extinguishing device includes a fixing base and a plurality of stainless steel sheets fixed in the fixing base and arranged in a stacked manner. A mica sheet is also provided between two adjacent stainless steel sheets, and the area of ​​the mica sheet is smaller than that of the stainless steel sheet, so that an air gap is formed between the two adjacent stainless steel sheets in the direction toward the moving and static contacts.

[0013] The thickness of the plurality of stainless steel sheets is equal, and the thickness of the mica sheet arranged between two adjacent stainless steel sheets is also equal to the thickness of the stainless steel sheets.

[0014] The moving contact includes a contact slider and a moving contact point. The contact slider is slidably mounted on the base along the first direction. The moving contact point is mounted on the front end of the contact slider. A second matching groove is provided at the rear of the contact slider. A hook is provided at one end of the push card. The hook at one end of the push card is gap-fitted in the second matching groove in the first direction to form an idle stroke by utilizing the gap.

[0015] There are two static contacts, which are installed side by side in the base. The moving contact also includes a bridge-type dynamic spring, which is installed on the front of the contact slider. The two ends of the bridge-type dynamic spring are respectively fixed to a dynamic contact and correspond to the static contacts of the two static contacts respectively. There are two grid arc extinguishing devices, which are respectively arranged at the midline position of the gap between the two pairs of dynamic and static contacts. The other side of the V-shape of the armature is set as two swing arms.

[0016] The iron core pole surface is composed of an end surface of an iron core fitted in the iron core hole of the magnetic circuit part and an end surface of a frame-shaped part sleeved at one end of the iron core, and the end surface of one end of the iron core is not flush with the end surface of the frame-shaped part, and the end surface of one end of the iron core is closer to one side of the V-shape of the armature relative to the end surface of the frame-shaped part.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention adopts a method of movably mounting a grid arc extinguishing device at a midline position of the gap between the moving contact and the stationary contact, and setting the armature to a V-shape. One side of the V-shape of the armature cooperates with the pole surface of the iron core of the magnetic circuit portion, and the end of one side of the V-shape is connected to the push card. When the armature is actuated, the push card is driven to move back and forth in a first direction, so that the moving and stationary contacts contact or separate in the first direction. The other side of the V-shape of the armature is linked to the grid arc extinguishing device, so that the grid arc extinguishing device moves back and forth in a second direction perpendicular to the first direction. When the moving and stationary contacts separate, the grid arc extinguishing device enters the gap between the moving and stationary contacts to cut the arc and extinguish the arc. When the moving and stationary contacts are in contact, the grid arc extinguishing device moves out of the gap between the moving and stationary contacts to avoid interfering with the contact between the moving and stationary contacts. The structure of the present invention is to design the grid arc extinguishing device to be movable into the gap between the moving and static contacts to cut the arc, cutting the long arc into several short arcs to achieve a better arc extinguishing effect. The grid arc extinguishing device is mechanically linked by the movement of the armature and the contact to ensure that the grid can completely enter the disconnected contacts to cut the arc, and finally achieve the arc extinguishing effect. It has the characteristics of relatively small size, simple structure, good arc extinguishing effect, easy manufacturing, and the ability to realize high voltage and high current load switching.

[0019] 2. The present invention adopts the method of combining two static contacts and a bridge-type moving spring to form a series air gap circuit, and respectively disposing two grid arc extinguishing devices at the midline position of the gap between the two pairs of moving and static contacts, so that the contact switching capacity is a maximum switching voltage of 600VDC and a current of up to 150A.

[0020] 3. The present invention utilizes a grid arc extinguishing device composed of a fixed base and multiple stainless steel sheets fixed therein and arranged in a stacked manner. Furthermore, a mica sheet is provided between two adjacent stainless steel sheets. The area of ​​the mica sheet is smaller than that of the stainless steel sheet, and an air gap is formed between the two adjacent stainless steel sheets in the direction toward the moving and static contacts. Furthermore, the thickness of the multiple stainless steel sheets is equal, and the thickness of the mica sheet provided between the two adjacent stainless steel sheets is also equal to that of the stainless steel sheet. This structure of the present invention utilizes the high-temperature resistance and oxidation resistance of the stainless steel sheets and the high-temperature insulation properties of the mica sheets to form multiple air gaps of equal size, thereby reducing the overall thickness of the grid and shrinking the internal space, thereby achieving a good arc extinguishing effect.

[0021] 4. This invention utilizes a metal rocker with a plastic body overlying its head through injection molding. The end of the plastic body is provided with a cylindrical structure. The tail of the metal rocker is riveted to the end of the armature's swing arm. The cylindrical structure of the plastic body fits into the first mating groove of the grid arc extinguishing device. This structure effectively envelops the metal rocker along the effective length of the plastic body, providing insulation and increasing creepage distance.

[0022] 5. This invention utilizes a second mating groove at the rear of the contact slider and a hook at one end of the push card. The hook fits into the second mating groove with clearance in the first direction, creating an idle stroke. This structure utilizes the idle stroke to prevent the contacts from colliding with the grid arc extinguishing device during both contact and disconnection.

[0023] 6. Since the present invention designs the V-shaped angle of the armature to be an acute angle, the length of the lower part of one side of the V-shape of the armature can be lengthened, so that the force arm of the corresponding restoring spring is lengthened, thereby reducing the reaction force of the relay and further improving the product suction.

[0024] 7. The present invention employs a core pole face comprised of one end face of the core, which fits within the core hole of the magnetic circuit, and the end face of a frame member that fits over one end of the core. Furthermore, the core end face is not flush with the frame end face, but rather is closer to one side of the V-shaped armature than the frame end face. This structure further enhances product attraction (the two end faces overlap during initial attraction, increasing the magnetic field) and strengthens attraction during the relay's overtravel phase (when the contacts are closed, the difference in height between the large and small end faces primarily affects the small end face, increasing the relay's holding force).

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the arc-extinguishing high-voltage DC relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the exploded three-dimensional structure of an embodiment of the present invention;

[0027] Figure 2 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention (excluding the housing);

[0028] Figure 3 1 is a schematic diagram of the three-dimensional structure of an embodiment of the present invention (excluding the housing and rotated at an angle);

[0029] Figure 4 2. It is a schematic diagram of the three-dimensional structure of two grid arc extinguishing devices according to an embodiment of the present invention;

[0030] Figure 5 Schematic diagram of the coordination of a stainless steel sheet and a mica sheet in a grid arc extinguishing device according to an embodiment of the present invention;

[0031] Figure 6 Schematic diagram of the coordination of two grid arc extinguishing devices and two pairs of moving and static contacts in an embodiment of the present invention;

[0032] Figure 7 Schematic diagram of the coordination between the armature and two metal rocker rods according to an embodiment of the present invention;

[0033] Figure 8 Schematic diagram of the armature in an embodiment of the present invention cooperating with two grid arc extinguishing devices through two metal rocker rods;

[0034] Figure 9 This is a schematic diagram of the cooperation between the push card, the moving contact, and the armature in an embodiment of the present invention;

[0035] Figure 10 Schematic diagram of the coordination of the armature, the restoring spring and the magnetic circuit portion according to an embodiment of the present invention;

[0036] Figure 11 1 is a schematic diagram of the three-dimensional structure of the magnetic circuit portion of an embodiment of the present invention;

[0037] Figure 12 This is a front view of the magnetic circuit portion of an embodiment of the present invention. DETAILED DESCRIPTION

[0038] Example

[0039] See also Figures 1 to 12 As shown, a high-voltage DC relay capable of extinguishing an arc of the present invention comprises a housing 1, a base 2, a magnetic circuit portion 3, a moving contact 4, a static contact 5, a push card 6 and an armature 7; the moving contact 4, the static contact 5 and the magnetic circuit portion 3 are respectively mounted at corresponding positions of the base 2; the housing 1 is mounted on the base 2; the armature 7 cooperates with the magnetic circuit portion 3, and the push card 6 is connected between the moving contact 4 and the armature 7; the relay further comprises a grid arc extinguishing device 8, the grid arc extinguishing device 8 is movably mounted at the midline position of the gap between the moving contact 4 and the static contact 5, the armature 7 is V-shaped, and one side 71 of the V-shaped armature 7 is aligned with the magnetic circuit The iron core pole surface of part 3 is matched, and the end of one side 71 of the V-shape is connected to the push card 6, so that when the armature 7 is actuated, the push card 6 is driven to move back and forth along the first direction, so that the moving contact 4 and the static contact 5 are contacted or separated in the first direction. The other side 72 of the V-shape of the armature 7 is linked to the grid arc extinguishing device 8, so that the grid arc extinguishing device 8 is moved back and forth along the second direction perpendicular to the first direction, so that when the moving contact 4 and the static contact 5 are separated, the grid arc extinguishing device 8 enters the gap between the moving and static contacts to cut the arc and realize arc extinguishing. In the process of contact between the moving contact 4 and the static contact 5, the gap between the moving and static contacts is moved out to avoid interference with the contact between the moving and static contacts.

[0040] In this embodiment, the other side 72 of the V-shape of the armature 7 is configured as a swing arm, the grid arc extinguishing device 8 can be slidably engaged on the base 2 in a guided manner, and the grid arc extinguishing device 8 is provided with a first mating groove 81; the relay further includes a metal rocker 91, the head of the metal rocker 91 is covered with a plastic body 92 by injection molding, the end of the plastic body 92 is provided with a cylindrical structure 921, and the tail of the metal rocker 91 is riveted to the end of the swing arm 72 of the armature 7; the cylindrical structure 921 of the plastic body 92 is engaged with the first mating groove 81 of the grid arc extinguishing device 8 to convert the swinging motion of the swing arm 72 of the armature 7 into the guided motion of the grid arc extinguishing device 8 along the base 2.

[0041] In this embodiment, the V-shaped included angle of the armature 7 is an acute angle. The armature 7 is installed in the base 2 through the restoring spring 93 and cooperates with the magnetic circuit part 3.

[0042] In this embodiment, in the base 2, a first sliding groove 21 along the second direction is provided at the moving position corresponding to the grid arc extinguishing device 8, and the grid arc extinguishing device 8 is provided with a first protrusion 82. The first protrusion 82 of the grid arc extinguishing device 8 slides and fits in the first sliding groove 21 of the base 2 to realize the guided movement of the grid arc extinguishing device 8 in the base 2.

[0043] In this embodiment, the grid arc extinguishing device 8 includes a fixing base 83 and a plurality of stainless steel sheets 84 fixed therein and arranged in a stacked manner. A mica sheet 85 is provided between two adjacent stainless steel sheets 84. The area of ​​the mica sheet 85 is smaller than that of the stainless steel sheets 84, forming an air gap 86 between the two adjacent stainless steel sheets 84 in the direction toward the moving and static contacts. The first mating groove 81 and the first protrusion 82 are provided on the fixing base 83.

[0044] In this embodiment, the thickness of the plurality of stainless steel sheets 84 is equal, and the thickness of the mica sheet 85 disposed between two adjacent stainless steel sheets 84 is also equal to the thickness of the stainless steel sheet 84 .

[0045] In this embodiment, the moving contact 4 includes a contact slider 41 and a moving contact 42. The contact slider 41 is slidably mounted on the base 2 along the first direction. The moving contact 42 is mounted on the front end of the contact slider 41. A second mating groove 43 is provided at the rear portion of the contact slider 41. A hook 61 is provided at one end of the push card 6. The hook 61 at one end of the push card 6 is fitted into the second mating groove 43 with a gap 44 in the first direction to utilize the gap 44 to form an idle stroke.

[0046] In this embodiment, there are two static contacts 5, which are installed side by side in the base 2. The moving contact 4 also includes a bridge-type dynamic spring 45, which is installed at the front of the contact slider 41. The two ends of the bridge-type dynamic spring 45 are respectively fixed with a dynamic contact 42, and the two dynamic contacts 42 correspond to the static contacts 51 of the two static contacts 5. There are two grid arc extinguishing devices 8, which are respectively arranged at the midline position of the gap between the two pairs of moving and static contacts. The other side of the V-shape of the armature 7 is set as two swing arms 72. The two swing arms 72 are respectively engaged in the first engaging grooves 81 of the two grid arc extinguishing devices 8 through two metal rocker rods 91.

[0047] In this embodiment, the core pole surface is composed of an end face 311 of an iron core 31 fitted in the iron core hole of the magnetic circuit portion and an end face 321 of a frame-shaped member 32 sleeved at one end of the iron core 31, and the end face 311 of the iron core 31 is not flush with the end face 321 of the frame-shaped member 32, and the end face 311 of the iron core 31 is closer to one side 71 of the V-shape of the armature 7 relative to the end face 321 of the frame-shaped member 32.

[0048] In a high-voltage DC relay capable of arc extinguishing according to the present invention, a grid arc extinguishing device 8 is formed by stacking several stainless steel sheets 84 and mica sheets 85 with high temperature resistance and high insulation. The stainless steel sheets 84 and mica sheets 85 form a plurality of equal air gaps. In this embodiment, 13 mica sheets 85 and 14 stainless steel sheets 84 are stacked to form a grid arc extinguishing device 8. The movable spring 45 adopts a bridge design. In this way, a total of 30 equal air gaps can be formed. When the contacts are disconnected, an extremely high-energy arc will be generated. At this time, the arc-extinguishing grids in the arc-extinguishing grid device 8 quickly enter the contacts, and the arc enters several equal air gaps composed of stainless steel sheets 84 and mica sheets 85, cutting it into several short arcs. At this time, the arc energy is instantly weakened. There are mica sheets 85 with high temperature resistance and high insulation between each air gap as reinforced partitions. In addition, the stainless steel sheet 84 is more resistant to high temperature and anti-oxidation than the iron sheet. Therefore, the stainless steel sheet 84 and the mica sheet 85 are superimposed to prevent the arc between the air gaps from being broken down. Since the number of air gaps composed of the left and right grids is large enough, the voltage acting between the contacts is less than the total dielectric strength between the arc-extinguishing grids, and the arc will no longer reignite. The contact switching capacity is a maximum switching voltage of 600VDC and a current of up to 150A.

[0049] To achieve the desired arc-cutting effect, the grid arc extinguishing device 8 is designed to be linked to the V-shaped armature 7. The grid arc extinguishing device 8 and one side 71 of the V-shape of the armature 7 move perpendicularly to each other. Under the influence of the electromagnetic field, the head of the armature 7 (the end of one side 71 of the V-shape) drives the pusher 6 in a horizontal direction (i.e., a first direction), while the tail of the armature 7 (i.e., the end of the other side 72 of the V-shape) drives the grid arc extinguishing device 8 in a vertical direction (i.e., a second direction). In the initial state, the moving contact 4 and the stationary contact 5 are open, and the grid portion of the grid arc extinguishing device 8 is stationary between the open contacts. After the coil of the magnetic circuit part 3 is energized, the armature 7 overcomes the reaction force of the restoring spring 93, and the head of the armature 7 drives the push card 6 to move toward the contact. At the same time, the grid arc extinguishing device 8 also moves downward to make the grid of the grid arc extinguishing device 8 gradually leave the contact. In order to ensure that the moving and static contacts do not interfere with the grid of the grid arc extinguishing device 8 during the contact process, an idle stroke 44 is designed between the push card 6 and the contact slider 41. When the idle stroke 44 is completed, the grid of the grid arc extinguishing device 8 has completely left the moving and static contacts. At this time, the moving and static contacts can reliably connect the circuit. When the coil of the magnetic circuit part 3 is powered off, the armature 7 is acted upon by the reaction force of the restoration spring 93, and the head of the armature 7 drives the push card 6 to move away from the contact. At the same time, the grid of the grid arc extinguishing device 8 also moves toward the contact. When the push card 6 completes the idle stroke between it and the contact slider 41, the head of the push card 6 pulls the contact slider 41 to move together. Only then will the moving and static contacts be opened, and the grid of the grid arc extinguishing device 8 will quickly enter the contacts to complete the arc cutting.

[0050] A high-voltage DC relay capable of extinguishing an arc of the present invention adopts a method in which a grid arc extinguishing device 8 is movably installed at the midline position of the gap between the moving contact 4 and the static contact 5, the shape of the armature 7 is set to be V-shaped, and one side 71 of the V-shape of the armature 7 cooperates with the pole surface of the iron core of the magnetic circuit portion. The end of the one side 71 of the V-shape is connected to the push card 6, so that when the armature 7 is actuated, the push card 6 is driven to move back and forth in a first direction, so that the moving and static contacts 4, 5 contact or separate in the first direction. The other side 72 of the V-shape of the armature 7 is linked to the grid arc extinguishing device 8, so that the grid arc extinguishing device 8 moves back and forth in a second direction perpendicular to the first direction, so that when the moving and static contacts 4, 5 separate, the grid arc extinguishing device 8 enters the gap between the moving and static contacts 4, 5 to cut the arc and achieve arc extinguishing, and when the moving and static contacts 4, 5 are in contact, the grid arc extinguishing device 8 moves out of the gap between the moving and static contacts 4, 5 to avoid interfering with the contact of the moving and static contacts. The structure of the present invention is to design the grid arc extinguishing device 8 to be movable into the gap between the moving and static contacts 4 and 5 to cut the arc, cutting the long arc into several short arcs to achieve a better arc extinguishing effect. The grid arc extinguishing device 8 is mechanically linked by the movement of the armature and the contacts to ensure that the grid can completely enter the disconnected contacts to cut the arc, and finally achieve the arc extinguishing effect. It has the characteristics of relatively small size, simple structure, good arc extinguishing effect, easy manufacturing, and the ability to realize high voltage and high current load switching.

[0051] The present invention provides an arc-extinguishing high-voltage DC relay, which utilizes two stationary contacts 5 and a bridge-type moving spring 45 to form a series air-gap circuit, and two grid arc-extinguishing devices 8 to be respectively arranged at the midline position of the gap between the two pairs of moving and stationary contacts, so that the contact switching capability is such that the maximum switching voltage reaches 600 VDC and the current can reach 150 A.

[0052] The present invention discloses an arc-extinguishing high-voltage DC relay. The relay utilizes a grid arc-extinguishing device comprising a fixed base 83 and a plurality of stacked stainless steel sheets 84 fixed therein. A mica sheet 85 is provided between two adjacent stainless steel sheets 84. The mica sheet 85 is smaller in area than the stainless steel sheets 84, forming an air gap 86 between the two adjacent stainless steel sheets 84 in the direction toward the moving and stationary contacts. Furthermore, the plurality of stainless steel sheets 84 are of equal thickness, and the thickness of the mica sheet 85 between the two adjacent stainless steel sheets 84 is also equal to that of the stainless steel sheet. This structure utilizes the high-temperature resistance and oxidation resistance of the stainless steel sheets 84 and the high-temperature insulation properties of the mica sheets 85 to form multiple air gaps of equal size. This reduces the overall thickness of the grid, shrinking the internal space, and achieving a good arc-extinguishing effect.

[0053] The arc-extinguishing high-voltage DC relay of the present invention employs a metal rocker 91 whose head is injection-molded and encapsulated by a plastic body 92. The end of the plastic body 92 is provided with a cylindrical structure 921. The tail of the metal rocker 92 is riveted to the end of the swing arm 72 of the armature 7. The cylindrical structure 921 of the plastic body 92 fits into the first mating groove 81 of the grid arc-extinguishing device 8. This structure of the present invention effectively encapsulates the metal rocker 91 within the effective length of the plastic body 92, providing effective isolation and increasing creepage distance.

[0054] The present invention employs a high-voltage DC relay capable of arc extinguishing, employing a second mating slot 43 provided at the rear of a contact slider 41. A hook 61 is provided at one end of a pusher 6. The hook 61 engages with the second mating slot 43 with a gap 44 in the first direction, thereby creating an idle stroke within the gap 44. This structure utilizes the idle stroke to prevent the contacts from colliding with the grid arc extinguishing device during both contact and disconnection.

[0055] The arc-extinguishing high-voltage DC relay of the present invention adopts a method of designing the V-shaped included angle of the armature 7 to be an acute angle, which can lengthen the length of the lower part of one side of the V-shape of the armature, so that the force arm of the restoring spring matched therewith is lengthened, thereby reducing the reaction force of the relay and further improving the product suction force.

[0056] The present invention employs an arc-extinguishing high-voltage DC relay with an iron core pole face formed by an end face 311 of an iron core 31 fitted within the core hole of the magnetic circuit portion and an end face 321 of a frame member 32 positioned at one end of the iron core. Furthermore, the end face 311 of the iron core 31 is not flush with the end face 321 of the frame member 32; instead, the end face 311 of the iron core 31 is closer to one side of the V-shaped armature 7 than the end face 321 of the frame member 32. This structure further enhances the product's suction force (the two end faces overlap during initial attraction, increasing the magnetic field) and strengthens the suction force during the relay's overtravel phase (when the contacts are closed, the difference in height between the large and small end faces primarily affects the small end face, increasing the relay's holding force).

[0057] The above is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A high-voltage DC relay capable of arc extinguishing, comprising a base, a magnetic circuit, movable and stationary contacts, a pusher, and an armature; the movable and stationary contacts and the magnetic circuit are mounted in corresponding positions on the base; the armature cooperates with the magnetic circuit, and the pusher is connected between the movable contact and the armature; the relay also includes a grid arc extinguishing device; and is characterized in that: The grid arc extinguishing device is movably mounted at the midline position of the gap between the moving contact and the static contact. The armature is V-shaped. One side of the V-shaped armature cooperates with the pole face of the iron core of the magnetic circuit as a part of the armature. The end of one side of the V-shaped armature is connected to the push card so that when the armature is actuated, the push card is driven to move back and forth in the first direction, so that the moving and static contacts are in contact or separated in the first direction. The moving contact includes a contact slider, which is mounted on the base in a sliding manner along the first direction. The rear portion of the contact slider is provided with a second matching The armature has a V-shaped engaging groove, one end of the push card is provided with a hook head, and the hook head at one end of the push card is gap-fitted in the second matching groove in the first direction to form an idle stroke by utilizing the gap; the other side of the V-shape of the armature is linked to the grid arc extinguishing device, so that the grid arc extinguishing device moves back and forth along a second direction perpendicular to the first direction, so that when the moving and static contacts are separated, the grid arc extinguishing device enters the gap between the moving and static contacts to cut the arc and extinguish the arc, and during the contact process between the moving and static contacts, moves out of the gap between the moving and static contacts to avoid interfering with the contact between the moving and static contacts.

2. The arc-extinguishing high-voltage DC relay according to claim 1, characterized in that: The other side of the V-shape of the armature is provided as a swing arm, and the grid arc extinguishing device can be slidably fitted on the base in a guided manner. The grid arc extinguishing device is provided with a first matching groove, and the end of the swing arm is movably fitted in the first matching groove to convert the swinging motion of the swing arm of the armature into the guided motion of the grid arc extinguishing device along the base.

3. The arc-extinguishing high-voltage DC relay according to claim 2, characterized in that: The V-shaped included angle of the armature is an acute angle. The armature is installed in the base through a restoring spring and cooperates with the magnetic circuit part.

4. The arc-extinguishing high-voltage DC relay according to claim 2, characterized in that: In the base, a first sliding groove along the second direction is provided at a moving position corresponding to the grid arc extinguishing device, and the grid arc extinguishing device is provided with a first protrusion. The first protrusion of the grid arc extinguishing device is slidably fitted in the first sliding groove of the base to realize the guided movement of the grid arc extinguishing device in the base.

5. The arc-extinguishing high-voltage DC relay according to claim 2, characterized in that: Furthermore, it also includes a metal rocker arm, the head of the metal rocker arm is covered with a plastic body by injection molding, the end of the plastic body is provided with a cylindrical structure, and the tail of the metal rocker arm is fixed to the end of the swing arm of the armature by riveting; the cylindrical structure of the plastic body is fitted in the first fitting groove of the grid arc extinguishing device.

6. The arc-extinguishing high-voltage DC relay according to claim 1, characterized in that: The grid arc extinguishing device includes a fixing base and a plurality of stainless steel sheets fixed in the fixing base and arranged in a stacked manner. A mica sheet is also provided between two adjacent stainless steel sheets, and the area of ​​the mica sheet is smaller than that of the stainless steel sheet, so that an air gap is formed between the two adjacent stainless steel sheets in the direction toward the moving and static contacts.

7. The arc-extinguishing high-voltage DC relay according to claim 6, characterized in that: The thickness of the plurality of stainless steel sheets is equal, and the thickness of the mica sheet arranged between two adjacent stainless steel sheets is also equal to the thickness of the stainless steel sheets.

8. The arc-extinguishing high-voltage DC relay according to claim 1, characterized in that: The moving contact further comprises a moving contact point, and the moving contact point is mounted on the front end of the contact slider.

9. The arc-extinguishing high-voltage DC relay according to claim 8, characterized in that: There are two static contacts, which are installed side by side in the base. The moving contact also includes a bridge-type dynamic spring, which is installed on the front of the contact slider. The two ends of the bridge-type dynamic spring are respectively fixed to a dynamic contact and correspond to the static contacts of the two static contacts respectively. There are two grid arc extinguishing devices, which are respectively arranged at the midline position of the gap between the two pairs of dynamic and static contacts. The other side of the V-shape of the armature is set as two swing arms.

10. The arc-extinguishing high-voltage DC relay according to claim 1, characterized in that: The iron core pole surface is composed of an end surface of an iron core fitted in the iron core hole of the magnetic circuit part and an end surface of a frame-shaped part sleeved at one end of the iron core, and the end surface of one end of the iron core is not flush with the end surface of the frame-shaped part, and the end surface of one end of the iron core is closer to one side of the V-shape of the armature relative to the end surface of the frame-shaped part.

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