A high-voltage DC relay

Abstract

The present invention discloses a high-voltage DC relay, including a housing component, an inner support cover, two static contacts and a moving contact piece, wherein the inner support cover is arranged in the upper part of the housing component, the two static contacts are respectively arranged on the top of the inner support cover, the moving contact piece is located in the inner support cover, and the two ends of the moving contact piece in the length direction are respectively matched with the bottom ends of the two static contacts; it also includes at least two annular parts, the annular parts and the static contacts are discrete parts, and the outer side surface of each static contact is respectively fixedly fitted with at least one annular part, the annular part is located in the housing component and outside the inner support cover, and the space between the housing component, the inner support cover and the static contact and the annular parts thereon is filled with sealing glue, and the sealing glue forms a sealing layer after curing. The present invention only needs to perform sandblasting and / or knurling on the annular parts before assembly to improve the bonding force between the static contact and the glue, thereby reducing the processing difficulty and processing cost of the present invention, which is conducive to improving the processing efficiency of the present invention.

Description

Technical Field

[0001] The invention relates to the technical field of relays, and in particular to a high-voltage direct current relay. Background Art

[0002] A high-voltage DC relay is an electromagnetic switch that controls the on-and-off of a large current by switching a small current on and off. Its working principle is as follows: when the coil of the high-voltage DC relay is energized, the coil generates a magnetic field that drives the moving iron core to move upward. The moving iron core drives the moving contact piece upward by pushing the rod component, so that the moving contact piece contacts the two static contacts to achieve conduction, thereby achieving the purpose of controlling a large current with a small current.

[0003] The high-voltage DC relay of the prior art usually adopts a sealing structure, and there are two main sealing methods, one is ceramic sealing, and the other is epoxy glue sealing. The epoxy-sealed high-voltage DC relay is to seal the two static contacts, the moving contact piece, the push rod component and the coil assembly and other parts in the cavity surrounded by the inner support cover and the iron cup. Specifically, the two static contacts are installed on the top of the inner support cover, and the lower part of the static contact is accommodated in the inner support cover; the inner support cover is installed on the upper part of the iron cup, so that the inner support cover and the iron cup form a cavity; the moving contact piece, the push rod component and the coil assembly and other parts are respectively installed in the cavity. When sealing, the iron cup is installed in the outer shell, and epoxy glue is injected, so that the inner side of the outer shell, the inner support cover, the space between the iron cup and the static contact is filled with epoxy glue, so that the cavity surrounded by the iron cup and the inner support cover forms a closed cavity. Since the static contact is made of metal that is easily oxidized, it is necessary to perform sandblasting on the static contact before assembly to make the outer side of the static contact rough, so as to enhance the bonding force between the static contact and the glue and improve the sealing. During sandblasting, in order to avoid scratches on the surface caused by the collision of the static contact, the static contacts need to be manually placed into the tooling one by one before sandblasting. This sandblasting method is inefficient, and if the static contact is not properly stored after sandblasting, its surface will be oxidized again. In order to improve the bonding force in the X-axis direction, that is, the circumferential direction, and increase the torque when the copper busbar is connected externally, some will set a knurling pattern on the outer side of the static contact to enhance the torque when the static contact is connected externally to the copper busbar, but setting a knurling pattern on the outer side of the static contact is difficult to process and the process is relatively complicated. Summary of the invention

[0004] The present invention aims at the technical problems existing in the prior art and provides a high-voltage DC relay, which adopts a method of fixing an annular piece at the position where the static contact is combined with glue, so that the static contact can be exempted from sandblasting before assembly.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage DC relay, including a shell component, an inner support cover, two static contacts and a moving contact piece, the inner support cover is arranged in the upper part of the shell component, the two static contacts are respectively inserted through the top of the inner support cover, the moving contact piece is located in the inner support cover, and its two ends in the length direction are respectively matched with the bottom ends of the two static contacts; it also includes at least two annular parts, the annular parts and the static contacts are discrete parts, and the outer side surfaces of each static contact are respectively fixedly mounted with at least one annular part, the annular part is located in the shell component and outside the inner support cover, and the space between the shell component, the inner support cover and the static contact and the annular parts thereon is filled with sealing glue, and the sealing glue forms a sealing layer after curing.

[0006] Furthermore, the annular member is fixed to the outer side surface of the static contact by welding or riveting.

[0007] Furthermore, the annular member is sandblasted.

[0008] Furthermore, the annular member is made of a material that will not oxidize or is not easily oxidized.

[0009] Furthermore, the outer side surface of the annular member is provided with a knurling pattern.

[0010] Furthermore, an annular boss located below the annular member is provided on the outer side surface of the static contact, and the annular member is supported by the annular boss.

[0011] Furthermore, the longitudinal section of the annular member is in an "L" shape, an inverted "L" shape, a "U" shape, a "1" shape, a horizontal "V" shape, or an arc shape.

[0012] Furthermore, two magnetic steel components are arranged in the inner support cover, and the two magnetic steel components are respectively located on both sides of the moving contact piece in the length direction, and the polarities of the two magnetic steel components are opposite; an arc-starting structure is arranged at the bottom ends of the two static contacts and / or the two ends of the moving contact piece along the width direction of the moving contact piece.

[0013] Furthermore, the bottom surface of the static contact is an arc surface which is lower in the middle and higher at both ends in the width direction of the moving contact piece, and the portion of the arc surface extending from the middle to both sides in the width direction of the moving contact piece constitutes the arc striking structure of the static contact, or, the bottom of the static contact is provided with arc blocking protrusions on both sides in the length direction thereof, and the bottom surface of the arc blocking protrusion and the bottom surface of the static contact constitute an arc surface which is lower in the middle and higher at both ends in the width direction of the moving contact piece, and the portion of the arc surface extending from the middle to both sides in the width direction of the moving contact piece constitutes the arc striking structure of the static contact.

[0014] Furthermore, the lower part of the static contact is flat, and its length direction is perpendicular to the length direction of the moving contact piece, and / or it also includes a coil assembly and a push rod component. The coil assembly is located in the shell component and under the inner support cover. The moving contact piece is driven by the push rod component, and the push rod component is linked to the moving iron core in the middle of the coil assembly.

[0015] Furthermore, the two ends of the moving contact piece in the length direction are respectively convex to form a protrusion that contacts and cooperates with the static contact; the arc-striking structure of the moving contact piece is an arc-striking chamfer set on the top edge of the protrusion, the protrusion is semicircular, and its straight edge is located at one end of the moving contact piece in the length direction, and its arc edge is located between the two ends of the moving contact piece in the length direction, and the arc-striking chamfer is set; or, the top surface of the protrusion is an arc surface with a high middle and low ends in the width direction of the moving contact piece, and the part of the arc surface extending from the middle to the two sides of the moving contact piece in the width direction constitutes the arc-striking structure of the moving contact piece.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Since the present invention also includes at least two annular parts, the annular parts and the static contacts are separate parts, and at least one annular part is fixedly mounted on the outer side of each static contact, and the annular part is located inside the shell part and outside the inner support cover. The space between the shell part, the inner support cover, the static contact and the annular parts thereon is filled with sealing glue. Therefore, the static contact fixes the annular part at the part combined with the glue. Before assembly, only sandblasting treatment is required for the annular part, etc., to improve the bonding force between the static contact and the glue. Moreover, compared with the static contact, the annular part is easier to sandblast, and a certain amount of annular parts can be directly placed in the sandblasting machine for sandblasting, and the static contacts do not need to be placed in the tooling and sandblasted one by one, thereby reducing the processing difficulty and processing cost of the present invention, which is conducive to improving the processing efficiency of the present invention. In addition, the present invention can perform knurling treatment on the annular part separately to improve the bonding force between the annular part and the glue in the circumferential direction, thereby increasing the torque when the static contact is externally connected to the copper bar.

[0018] 2. The annular member is welded or riveted to the outer side of the stationary contact, so that the fixing process of the annular member and the stationary contact is simple and the fixing is firm.

[0019] 3. Since arc-starting structures are respectively provided at both ends of the two stationary contacts and the moving contact piece, the arc generated by the disconnection of the stationary contact and the moving contact piece can be elongated in the arc blowing direction of the magnetic steel component, so that the arc generated by the disconnection of the stationary contact and the moving contact piece can be easily pulled apart, and the arc extinguishing effect of the present invention is improved by combining the magnetic steel component. In addition, the arc blowing direction of the magnetic steel component of the present invention is in the width direction of the moving contact piece, and the free space on both sides of the width direction of the moving contact piece can be used to increase the arc extinguishing space. The arc extinguishing space is sufficient and there is no need to set an arc extinguishing grid.

[0020] 4. The bottom surface of the static contact is an arc surface which is low in the middle and high at both ends in the width direction of the moving contact piece. The portion of the arc surface extending from the middle to both sides in the width direction of the moving contact piece constitutes the arc striking structure of the static contact. Not only is the structure simple, but also when the static contact is disconnected from the moving contact piece, the generated arc can be pulled apart along the arc surface, thereby achieving a better arc extinguishing effect.

[0021] 5. The lower part of the static contact is flat, and its length direction is perpendicular to the length direction of the moving contact piece, so that the lower part of the flat static contact occupies less space, so that the volume of the magnetic steel component can be made larger, the magnetic field generated is stronger, and the arc extinguishing effect is better. In addition, the two ends of the static contact in the length direction are respectively close to the two ends of the magnetic steel component, and the magnetic steel component can be used to form a constant magnetic field at the end to extinguish the arc, thereby improving the utilization rate of the magnetic steel component and the arc extinguishing effect. The lower part of the static contact is flat, which can also increase the distance from the static contact surface to the inner support cover to prevent the inner support cover from being burned by the arc.

[0022] 6. The bottom of the static contact is provided with arc-blocking protrusions on both sides in the length direction thereof, and the arc-blocking protrusions are used to block the arc generated by the disconnection of the static contact and the moving contact piece, so that the arc burns as far as possible below the bottom of the static contact to avoid the arc splashing upwards, thereby increasing the creepage distance and improving the insulation.

[0023] 7. The arc-striking chamfer or arc surface is provided on the protrusion of the moving contact piece, which not only has a simple structure, but also enables the generated arc to be pulled apart along the arc-striking chamfer or arc surface when the static contact is disconnected from the moving contact piece, thereby achieving a better arc extinguishing effect.

[0024] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the high-voltage DC relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a cross-sectional view of the first embodiment of the present invention;

[0026] Figure 2 is a schematic diagram of the three-dimensional structure of the annular member of the present invention in Example 1;

[0027] Figure 3is a schematic diagram of the three-dimensional structure of the static contact and the annular member in the assembled state according to the first embodiment of the present invention;

[0028] Figure 4 is a cross-sectional view of the static contact and the annular member of the present invention in the first embodiment in the assembled state;

[0029] Figure 5 is a schematic diagram of the three-dimensional structure of the movable contact piece of the present invention in the first embodiment;

[0030] Figure 6 is a cross-sectional view of the inner support cover, the moving contact piece, and the magnetic steel component of the present invention in the first embodiment in an assembled state;

[0031] Figure 7 It is a three-dimensional structural schematic diagram of the static contact and the annular member (in an inverted L shape) of the present invention in a combined state;

[0032] Figure 8 It is a cross-sectional view of the static contact and the annular member (in an inverted "L" shape) of the present invention in a combined state;

[0033] Fig. 9 It is a three-dimensional structural schematic diagram of the static contact and the annular member (in the shape of a letter "コ") of the present invention in a combined state;

[0034] Fig.10 It is a cross-sectional view of the static contact and the annular member (in the shape of a letter "コ") of the present invention in the assembled state;

[0035] Fig.11 It is a three-dimensional structural schematic diagram of the static contact and the annular member (in a "V" shape) of the present invention in a combined state;

[0036] Fig.12 It is a cross-sectional view of the static contact and the annular member (in a "V" shape) of the present invention in a combined state;

[0037] Fig.13 It is a three-dimensional structural schematic diagram of the static contact and the annular member (in the shape of "1") in the combined state of the present invention;

[0038] Fig.14 is a cross-sectional view of the static contact and the annular member (in the shape of "1") of the present invention in the second embodiment in the assembled state;

[0039] Fig.15 It is a three-dimensional structural schematic diagram of the static contact and the annular member (in an arc shape) of the present invention in a combined state;

[0040] Fig.16 It is a cross-sectional view of the static contact and the annular member (in an arc shape) of the present invention in a combined state;

[0041] Fig.17is a schematic diagram of the three-dimensional structure of the static contact and the annular member in the assembled state according to the second embodiment of the present invention;

[0042] Fig.18 is a cross-sectional view of the static contact and the annular member of the second embodiment of the present invention in an assembled state;

[0043] Fig.19 is a cross-sectional view of the second embodiment of the present invention;

[0044] Fig. 20 It is a three-dimensional structural schematic diagram of the static contact (without annular boss) and the annular member (in an inverted "L" shape) of the present invention in a combined state;

[0045] Fig.21 It is a cross-sectional view of the static contact (without an annular boss) and the annular member (in an inverted "L" shape) of the present invention in a combined state;

[0046] Fig. 22 It is a three-dimensional structural schematic diagram of the static contact (without annular boss) and the annular member (in the shape of a letter "コ") of the present invention in a combined state;

[0047] Fig.23 It is a cross-sectional view of the static contact (without annular boss) and the annular member (in a "コ" shape) of the present invention in a combined state;

[0048] Fig.24 It is a three-dimensional structural schematic diagram of the static contact (without annular boss) and the annular member (in "L" shape) of the present invention in a combined state;

[0049] Fig.25 It is a cross-sectional view of the static contact (without annular boss) and the annular member (in "L" shape) of the present invention in a combined state;

[0050] Fig.26 It is a three-dimensional structural schematic diagram of the static contact (without annular boss) and the annular member (in a horizontal "V" shape) of the present invention in a combined state;

[0051] Fig. 27 It is a cross-sectional view of the static contact (without annular boss) and the annular member (in a horizontal "V" shape) of the present invention in a combined state;

[0052] Fig.28 It is a three-dimensional structural schematic diagram of the static contact (without annular boss) and the annular member (in arc shape) in the combined state of the present invention;

[0053] Fig.29 It is a cross-sectional view of the static contact (without annular boss) and the annular member (in arc shape) of the present invention in a combined state;

[0054] Fig.30 is a schematic diagram of the three-dimensional structure of the movable contact piece of the third embodiment of the present invention;

[0055] Among them, 1. outer shell, 2. iron cup, 3. inner support cover, 31. through hole, 32. fixing groove, 4. static contact, 41. lower part of static contact, 411. arc blocking protrusion, 412. bottom surface, 42. annular boss, 5. moving contact piece, 51. protrusion, 511. arc starting chamfer 512. top surface, 6. coil assembly, 7. push rod component, 8. magnetic steel component, 9. ring part, 10. guide plate, 20. sealing layer. DETAILED DESCRIPTION

[0056] Embodiment 1

[0057] See also Figure 1-Figure 16 As shown, a high-voltage DC relay of the present invention comprises a housing component, an inner support cover 3, two static contacts 4, a moving contact piece 5, a coil assembly 6 and a push rod component 7. The inner support cover 3 and the coil assembly 6 are distributed in the housing component in the up-down direction, and the coil assembly 6 is located below the inner support cover 3. The two static contacts 4 are respectively arranged on the top of the inner support cover 3. The moving contact piece 5 is located in the inner support cover 3, and its two ends in the length direction are respectively matched with the bottom ends of the two static contacts 4. The moving contact piece 5 is driven by the push rod component 7, and the push rod component 7 is linked with the moving iron core 61 in the middle of the coil assembly 6. Two magnetic steel components 8 are arranged in the inner support cover 3. The two magnetic steel components 8 are respectively located on both sides of the moving contact piece 5 in the length direction, and the two magnetic steel components 8 are respectively arranged corresponding to the contact gap between the static contact 4 and the moving contact piece 5, and the polarities of the two magnetic steel components 8 are opposite. The present invention also includes at least two annular parts 9, which are separate parts from the static contact 4. At least one annular part 9 is fixedly mounted on the outer side of each static contact 4. The annular part 9 is located inside the shell part and outside the inner support cover 3. The space between the shell part, the inner support cover 3, the static contact 5 and the annular parts 9 thereon is filled with sealing glue, which forms a sealing layer 20 after curing. The at least two refers to two or more, and the at least one refers to one or more. Specifically, the number of the annular parts 9 is specifically two, and the two annular parts 9 correspond to the two static contacts 4 one by one.

[0058] In this embodiment, the annular member 9 is fixed to the outer side surface of the static contact 4 by welding. Specifically, the annular member 9 is fixed to the outer side surface of the static contact 4 by laser welding. And the annular member 9 is sandblasted before being mounted on the static contact 4 to make its surface rougher. In addition, the annular member 9 is made of a material that will not oxidize or is not easy to oxidize, which can prevent the fixing member from being oxidized again after sandblasting. In other embodiments, the annular member is fixed to the outer side surface of the static contact by riveting. In other embodiments, the outer side surface of the annular member is provided with a knurling pattern, which can improve the bonding force between the annular member and the glue in the circumferential direction, thereby increasing the torque when the static contact is connected to the copper busbar.

[0059] In this embodiment, the outer side surface of the static contact 4 is provided with an annular boss 42 located below the annular member 9, and the annular member 9 is supported by the annular boss 42. Since the longitudinal section of the annular member 9 is in an "L" shape, the bottom surface of the horizontal part of the annular member 9 is in contact with the top surface of the annular boss 42. Figure 3 , Figure 4 The annular boss 42 can pre-position the annular member 9 during the process of welding and fixing the annular member 9 and the stationary contact 4, making the welding operation more convenient.

[0060] In this embodiment, the longitudinal section of the annular member 9 is in an "L" shape, but is not limited thereto. In other embodiments, the longitudinal section of the annular member 9 is in an inverted "L" shape, a "コ" shape, a "1" shape, a horizontal "V" shape, an arc shape, etc. Figure 7-Figure 16 shown.

[0061] In this embodiment, arc striking structures are respectively provided at the bottom ends of the two stationary contacts 4 and at both ends of the moving contact piece 5 to lengthen the arc generated by the separation of the stationary contacts 4 and the moving contact piece 5 in the arc blowing direction of the magnetic steel component 8 .

[0062] In this embodiment, the lower part 41 of the static contact is flat, and its length direction is perpendicular to the length direction of the moving contact piece 5. The part of the static contact 2 that passes downward through the through hole 31 of the inner support cover 3 for the static contact and enters the inner support cover 3 is defined as the lower part 41 of the static contact. In this way, the lower part 41 of the flat static contact occupies less space than the lower part of the circular static contact, so that the volume of the magnetic steel component 8 can be made larger, the magnetic field is stronger, and the arc extinguishing effect is better. In addition, the two ends of the lower part 41 of the static contact in the length direction are respectively close to the two ends of the magnetic steel component 8, and the magnetic steel component 8 can be used to form a constant magnetic field at the end to extinguish the arc, thereby improving the utilization rate of the magnetic steel component 8 and improving the arc extinguishing effect. The lower part 41 of the static contact is flat, which can also increase the distance from the surface of the static contact 4 to the inner support cover 3 to prevent the inner support cover 3 from being burned by the arc. The bottom of the static contact 4 is provided with arc blocking protrusions 411 on both sides in the length direction. The arc blocking protrusions 411 can prevent the arc generated by the disconnection of the static contact 4 and the moving contact piece 5 from splashing upward, so that the arc burns as far as possible below the bottom of the static contact 4 to avoid the arc splashing upward, thereby increasing the creepage distance and improving the insulation. The bottom surface of the arc blocking protrusion 411 and the bottom surface 412 of the static contact form an arc surface with a low middle and high ends in the width direction of the moving contact piece. The part of the arc surface extending from the middle to the two sides in the width direction of the moving contact piece constitutes the arc striking structure of the static contact. When the static contact 4 is disconnected from the moving contact piece 5, the generated arc can be pulled apart along the arc surface, so that the arc extinguishing effect is better. Since the bottom surface of the arc-blocking protrusion 411 and the bottom surface 412 of the static contact are both arc surfaces, and the bottom surface of the arc-blocking protrusion 411 and the bottom surface 412 of the static contact are concentric and have the same radial dimensions, it is possible not only to avoid the bottom surface of the arc-blocking protrusion 411 from affecting the arc-drawing effect of the bottom surface 412 of the static contact, but also to increase the arc-drawing length of the bottom surface 412 of the static contact, thereby improving the arc extinguishing effect of the present invention.

[0063] In this embodiment, the two ends of the movable contact piece 5 in the length direction are respectively raised to form a convex block 51 that contacts and cooperates with the stationary contact 4, and the arc-striking structure of the movable contact piece 5 is an arc-striking chamfer 511 provided at the top edge of the convex block 51. Specifically, the convex block 51 is semicircular, and its straight edge is located at one end of the movable contact piece 5 in the length direction, and its arc edge is located between the two ends of the movable contact piece 5 in the length direction, and the arc-striking chamfer 511 is provided. When the stationary contact 4 is disconnected from the movable contact piece 5, the generated arc is elongated by the arc-striking chamfer 511.

[0064] In this embodiment, the inner support cover 3 is provided with two fixing grooves 32 corresponding to the two magnetic steel components 8, the notches of each fixing groove 32 are respectively facing downward, and each magnetic steel component 8 is respectively embedded in the corresponding fixing groove 32, and is limited by the guide plate 10 provided at the bottom of the inner support cover 3. The guide plate 10 also provides guidance for the up and down movement of the push rod component 7.

[0065] In this embodiment, the two magnetic steel components 8 each include a flat magnetic steel, but are not limited to this. In other embodiments, the two magnetic steel components can be composed of at least two flat magnetic steels with the same magnetic pole distribution stacked along the length direction or width direction of the moving contact piece.

[0066] In this embodiment, the housing component includes a non-metallic housing 1 and an iron cup 2 installed in the housing 1, the inner support cover 3 is installed in the upper part of the iron cup 2, and the two are interference fit. The coil assembly 6 is installed in the lower part of the iron cup 2.

[0067] A high-voltage DC relay of the present invention has a ring-shaped part 9 fixed at the part where the static contact 4 is combined with the glue. Therefore, before assembly, the ring-shaped part 9 only needs to be sandblasted and / or knurled to improve the bonding force between the static contact 4 and the glue. Moreover, compared with the static contact, the ring-shaped part 9 is easier to be sandblasted and knurled. This is because before assembly, the ring-shaped part 9 can be sandblasted in batches (a certain amount of ring-shaped parts can be directly placed in a sandblasting machine for sandblasting, without the need to place the static contacts one by one in a tooling and sandblasting), without worrying about the surface of the ring-shaped part 9 being scratched, and compared with the static contact 4, the ring-shaped part 9 has a more flexible material selection, and can be made of a material that will not oxidize and has a rough surface, or made of a material that is not easy to oxidize, so as to avoid secondary oxidation and the need for repeated sandblasting. Therefore, the method of fixing the ring-shaped part 9 outside the static contact 4 of the present invention can reduce the processing difficulty and processing cost of the present invention, which is conducive to improving the processing efficiency of the present invention.

[0068] In a high-voltage DC relay of the present invention, since the polarities of the two magnetic steel components 8 are opposite to each other, the magnetic lines of force will be emitted from one of the magnetic steel components and return to the other magnetic steel component along the length direction of the moving contact piece. Figure 6 As shown in the figure, the arrow in the length direction of the moving contact piece 5 indicates the direction of the magnetic force line. Therefore, the arc blowing direction of the magnetic steel component is located in the width direction of the moving contact piece 5, as shown in FIG. Figure 6 As shown in the figure, the arrow in the width direction of the moving contact piece 5 indicates the arc blowing direction. Therefore, the present invention can use the free space on both sides of the moving contact piece 5 in the width direction to increase the arc extinguishing space. The arc extinguishing space is sufficient and there is no need to set an arc extinguishing grid. After the two ends of the two static contacts 4 and the moving contact piece 5 are respectively provided with arc-strike structures along the width direction of the moving contact piece 4, the arc generated by the disconnection of the static contact 4 and the moving contact piece 5 can be elongated in the arc blowing direction of the magnetic steel component 8, so that the arc generated by the disconnection of the static contact 4 and the moving contact piece 5 can be easily pulled apart, thereby improving the arc extinguishing effect of the present invention.

[0069] Embodiment 2

[0070] See also Figure 17-Figure 29As shown, a high-voltage DC relay of the present invention is different from the above-mentioned embodiment 1 in that the annular boss is not provided on the outer side surface of the static contact 4. At this time, the step surface formed by the bottom of the annular member 9 and the static contact 4 can be directly matched with the inner support cover 3, thereby further reducing the processing cost of the static contact 4.

[0071] In this embodiment, the longitudinal section of the annular boss 9 is in the shape of "1", but it is not limited thereto. In other embodiments, the longitudinal section of the annular member 9 is in the shape of "L" or an inverted "L" or "コ" or "1" or a horizontal "V" or an arc, etc. Figure 20-Figure 29 shown.

[0072] Embodiment 3

[0073] See also Fig.30 As shown, a high-voltage DC relay of the present invention is different from the above-mentioned embodiments one and two in that: the top surfaces 512 of the protrusions 51 at both ends of the moving contact piece are respectively arc surfaces which are high in the middle and low at both ends in the width direction of the moving contact piece, and the part of the arc surface extending from the middle to both sides in the width direction of the moving contact piece constitutes the arc-starting structure of the moving contact piece 5.

[0074] In a high-voltage DC relay of the present invention, since the bottom surface 411 of the static contact is a downward convex arc surface, and the top surface 512 of the protrusion is an upward convex arc surface, the bottom surface 411 of the static contact and the protrusion 51 are equivalent to point contact when they are in contact. Therefore, at the moment when the bottom surface 411 of the static contact and the protrusion 51 are changed from a closed state to an open state, the generated arc is more easily pulled apart along the direction of the arc surface, thereby improving the arc extinguishing ability of the present invention.

[0075] The high-voltage direct current relay of the present invention has parts that are not involved that are the same as those in the prior art or can be implemented by using the prior art.

[0076] The above embodiments are only used to further illustrate a high-voltage DC relay of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-voltage DC relay, comprising a housing component, an inner support cover, two stationary contacts and a moving contact piece, wherein the inner support cover is arranged in the upper part of the housing component, the two stationary contacts are respectively arranged on the top of the inner support cover, the moving contact piece is located in the inner support cover, and the two ends of the moving contact piece in the length direction are respectively matched with the bottom ends of the two stationary contacts; characterized in that: It also includes at least two annular parts, which are separate parts from the static contacts. At least one annular part is fixedly mounted on the outer side of each static contact. The annular part is located inside the shell part and outside the inner support cover. The space between the shell part, the inner support cover, the static contact and the annular parts thereon is filled with sealing glue, which forms a sealing layer after curing.

2. The high voltage DC relay according to claim 1, characterized in that: The annular member is welded or riveted to the outer side surface of the stationary contact.

3. The high voltage DC relay according to claim 1, characterized in that: The annular member is sandblasted.

4. The high voltage DC relay according to claim 3, characterized in that: The annular member is made of a material that will not oxidize or is not easily oxidized.

5. The high voltage DC relay according to claim 1, characterized in that: The outer side surface of the annular member is provided with a knurling pattern.

6. The high voltage DC relay according to claim 1, characterized in that: An annular boss located below the annular member is disposed on the outer side surface of the stationary contact, and the annular member is supported by the annular boss.

7. The high voltage DC relay according to any one of claims 1 to 6, characterized in that: The longitudinal section of the annular member is in an "L" shape, an inverted "L" shape, a "U" shape, a "1" shape, a horizontal "V" shape, or an arc shape.

8. The high voltage DC relay according to claim 1, characterized in that: Two magnetic steel components are arranged in the inner support cover, and the two magnetic steel components are respectively located on both sides of the moving contact piece in the length direction, and the polarities of the two magnetic steel components are opposite; arc-strike structures are arranged at the bottom ends of the two static contacts and / or the two ends of the moving contact piece along the width direction of the moving contact piece.

9. The high voltage DC relay according to claim 8, characterized in that: The bottom surface of the static contact is an arc surface which is low in the middle and high at both ends in the width direction of the moving contact piece, and the portion of the arc surface extending from the middle to both sides in the width direction of the moving contact piece constitutes the arc striking structure of the static contact, or the bottom of the static contact is provided with arc blocking protrusions on both sides in the length direction thereof, and the bottom surface of the arc blocking protrusion and the bottom surface of the static contact form an arc surface which is low in the middle and high at both ends in the width direction of the moving contact piece, and the portion of the arc surface extending from the middle to both sides in the width direction of the moving contact piece constitutes the arc striking structure of the static contact.

10. The high voltage DC relay according to claim 8 or 9, characterized in that: The lower part of the static contact is flat, and its length direction is perpendicular to the length direction of the moving contact piece, and / or it also includes a coil assembly and a push rod component. The coil assembly is located in the shell component and under the inner support cover. The moving contact piece is driven by the push rod component, and the push rod component is linked to the moving iron core in the middle of the coil assembly.

11. The high voltage DC relay according to claim 8, characterized in that: The two ends of the moving contact piece in the length direction are respectively convex to form a protrusion that contacts and cooperates with the static contact of the static contact; the arc-striking structure of the moving contact piece is an arc-striking chamfer set on the top edge of the protrusion, the protrusion is semicircular, and its straight edge is located at one end of the moving contact piece in the length direction, and its arc edge is located between the two ends of the moving contact piece in the length direction, and the arc-striking chamfer is set; or, the top surface of the protrusion is an arc surface with a high middle and low ends in the width direction of the moving contact piece, and the part of the arc surface extending from the middle to the two sides of the moving contact piece in the width direction constitutes the arc-striking structure of the moving contact piece.

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