A high-voltage DC relay

Abstract

The present invention discloses a high-voltage DC relay, which includes a relay body, two static contacts, and a moving contact piece, a push rod, a magnetic circuit part, a first elastic member, a second elastic member, and a third elastic member located in the relay body. The magnetic circuit part includes a coil assembly, a moving iron core located in the coil assembly, and a fixed component located above the moving iron core and used for contact and cooperation with the moving iron core. A first elastic member is arranged between the moving iron core and the fixed component; the upper end of the second elastic member abuts against the moving contact piece, and the lower end of the second elastic member abuts against a first support portion arranged on the push rod; it further includes a movable member, the movable member is movably arranged on the push rod, the upper end of the third elastic member abuts against the movable member, and the lower end of the third elastic member abuts against a second support portion arranged on the push rod; after the moving contact piece contacts the two static contacts, the movable member moves upward by a preset displacement relative to the moving contact piece and then stops moving upward with the push rod. The present invention can not only greatly increase the contact pressure, but also avoid the situation that the moving iron core fails to be attracted in place.

Description

Technical Field

[0001] The present invention relates to a relay, in particular to a high-voltage direct-current relay. Background Art

[0002] The existing high-voltage direct-current relay generally includes a relay body, two static contacts, a moving contact piece, a push rod and a magnetic circuit part located in the relay body. The magnetic circuit part includes a coil, a moving iron core located in the coil, and a fixed component located above the moving iron core and used for contact and cooperation with the moving iron core. A spring is arranged between the moving iron core and the fixed component. In order to increase the contact pressure, several springs are sometimes arranged between the push rod and the moving contact piece. However, during the upward suction of the moving iron core of the high-voltage direct-current relay, since several springs between the push rod and the moving contact piece are synchronously compressed, the reaction force on the moving iron core is very large, even exceeding the suction force received by the moving iron core at a position with a relatively large magnetic gap, resulting in the failure of the moving iron core to be suctioned upward in place.

[0003] The following lists two cases of the prior art to further illustrate the problem of whether the moving iron core can be suctioned in place:

[0004] The first case is that the moving iron core is only subject to the reaction forces of two springs (one spring is located between the moving iron core and the fixed component, and the other spring is located between the push rod and the moving contact piece), as Figure 1 shown. The broken line e represents the relationship between the reaction force F received by the moving iron core and the magnetic gap δ (mm). Among them, the reaction force corresponding to the line segment e1 is generated by one spring, and the reaction force corresponding to the line segment e2 is generated by the two springs together. That is, during the upward movement of the moving iron core, the magnetic gap gradually becomes smaller. One spring is first compressed, and then the other spring is also compressed. At this time, the reaction force received by the moving iron core increases, but the reaction force received by the moving iron core is always less than the suction force received by the moving iron core. Therefore, the moving iron core can be suctioned upward in place. Although the method of using two springs does not affect the moving iron core being suctioned in place, the increase in the contact pressure is limited.

[0005] The second case is that the moving iron core is subject to the reaction forces of three springs (one spring is located between the moving iron core and the fixed component, and the remaining two springs are located between the push rod and the moving contact piece), as Figure 2As shown, the broken line f represents the relationship between the reaction force F on the moving iron core and the magnetic gap δ (mm). Among them, the reaction force corresponding to the line segment f1 is generated by one of the springs, and the reaction force corresponding to the line segment f2 is generated by three springs together. That is, during the upward movement of the moving iron core, the magnetic gap gradually becomes smaller. One of the springs is compressed first, and then the remaining springs are compressed simultaneously. Since the remaining two springs are compressed simultaneously before the moving iron core moves to the position with a large magnetic attraction force, the reaction force on the moving iron core at this time is very large, even greater than the suction force on the moving iron core (part of the line segment f2 is located above the curve b), which hinders the moving iron core from continuing to be attracted upward, resulting in the moving iron core not being attracted in place. Summary of the Invention

[0006] In view of the technical problems existing in the prior art, the present invention provides a high-voltage DC relay, which can not only increase the contact pressure but also avoid the situation where the moving iron core is not attracted in place.

[0007] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage DC relay, including a relay body, two static contacts, and a moving contact piece, a push rod, a magnetic circuit part, a first elastic member, a second elastic member, and a third elastic member located in the relay body. The magnetic circuit part includes a coil assembly, a moving iron core located in the coil assembly, and a fixed component located above the moving iron core and used for contact and cooperation with the moving iron core. A first elastic member is arranged between the moving iron core and the fixed component; the upper end of the push rod is movably connected to the moving contact piece, and the lower end of the push rod is fixedly connected to the moving iron core; the upper end of the second elastic member abuts against the moving contact piece, and the lower end of the second elastic member abuts against a first support portion arranged on the push rod; it further includes a movable member, the movable member is movably arranged on the push rod, the upper end of the third elastic member abuts against the movable member, and the lower end of the third elastic member abuts against a second support portion arranged on the push rod; after the moving contact piece contacts the two static contacts, the movable member moves upward by a preset displacement relative to the moving contact piece and then stops moving upward with the push rod.

[0008] Further, the moving contact piece is provided with a through hole for the top end of the push rod to pass through, and the movable member is sleeved outside the push rod; the moving contact piece is provided with a limit structure for limiting the upward stroke of the movable member.

[0009] Further, the movable member is fitted inside the through hole, and there is a clearance fit between the movable member and the hole wall of the through hole; a first limit boss is arranged on the outer side surface of the movable member, and the limit structure is a second limit boss arranged on the hole wall of the through hole. The first limit boss is located below the second limit boss and the two are matched with each other.

[0010] Further, the moving contact piece is provided with a through hole for the top end of the push rod to pass through, and the movable member is sleeved outside the push rod; the upward stroke of the movable member is limited by the bottom surface of the moving contact piece.

[0011] Furthermore, a guide barrel is provided in the relay body, and the top opening of the guide barrel is connected and cooperated with the inner support cover located in the relay body; the moving contact piece is movably arranged in the guide barrel up and down, and the bottom of the push rod passes downward through the bottom of the guide barrel, and the two static contacts are respectively arranged in the inner support cover, and the bottoms of the two static contacts are respectively located in the inner support cover.

[0012] Furthermore, two ceramic covers for blocking electric arcs are arranged in the guide barrel, and the two ceramic covers respectively include an upper ceramic part and a lower ceramic part that are butt-jointed and sealed; and a plurality of magnetic steels are inserted in the inner support cover.

[0013] Furthermore, a micro switch is provided in the relay body, and the moving contact piece or the push rod is connected to a toggle block for triggering the micro switch.

[0014] Furthermore, the toggle block is sleeved outside the push rod, and the upper side of the toggle block is limited by a retaining spring sleeved on the push rod, and the lower side of the toggle block is limited by a gasket sleeved on the push rod; the movable part is fitted under the gasket.

[0015] Furthermore, the first elastic member, the second elastic member and the third elastic member are respectively sleeved outside the push rod, and the first elastic member, the second elastic member and the third elastic member are all springs.

[0016] Furthermore, the fixing component is a first magnetic conductive sheet, or the fixing component is a static iron core, and the static iron core is fixed to the bottom end of a first magnetic conductive sheet arranged in the relay body.

[0017] Furthermore, the relay body includes a shell, an iron cup and an upper cover, the iron cup is arranged in the shell, and a second magnetic conductive sheet is arranged between the outer bottom surface of the iron cup and the inner bottom surface of the shell; the upper cover is arranged at the top opening of the shell, and the tops of the two static contacts are sealed through the upper cover respectively.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. Since the present invention further includes a movable member which is movably arranged on the push rod, the upper end of the third elastic member abuts against the movable member, and the lower end of the third elastic member abuts against the second support portion arranged on the push rod; after the moving contact piece contacts the two static contact pieces, the movable member moves upward relative to the moving contact piece by a preset displacement and then stops moving upward with the push rod, so that during the process of the moving iron core being attracted upward, the second elastic member and the third elastic member are not compressed synchronously, but are compressed successively, avoiding the reaction force received by the moving iron core being greater than the suction force during the process of the moving iron core being attracted upward, thereby avoiding the moving iron core not being attracted in place. After both the second elastic member and the third elastic member are compressed, the contact pressure increases, the contact resistance becomes smaller, and the temperature rise is small; when the contact is disconnected, the first elastic member, the second elastic member and the third elastic member all have reaction forces simultaneously, accelerating the disconnection of the contact. The faster the contact is disconnected, the shorter the arcing time is.

[0020] 2. The moving contact piece is provided with a limiting structure for limiting the upward stroke of the movable member, or the upward stroke of the movable member is limited by the bottom surface of the moving contact piece, so that the present invention directly limits the upward stroke of the movable member through the moving contact piece or its limiting structure, eliminating the need for additional limiting components and making the assembly simpler.

[0021] 3. The movable member is sleeved outside the push rod, making the installation and disassembly of the movable member convenient.

[0022] 4. The present invention uses a guiding barrel and an inner support cover to form a relatively sealed moving contact piece moving space. Compared with the prior art which uses a guiding plate and an inner support cover in cooperation, the risk of electric arc and pollutant leakage can be greatly reduced.

[0023] 5. The two ceramic covers of the present invention respectively include an upper ceramic part and a lower ceramic part which are butted and sealed up and down, capable of realizing upper and lower closure, thus solving the problem that the prior art using an integral ceramic cover cannot realize upper and lower closure.

[0024] The following further describes the present invention in detail with reference to the drawings and embodiments; however, a high-voltage DC relay of the present invention is not limited to the embodiments. Description of the Drawings

[0025] Figure 1 is a schematic diagram of the relationship between the suction force / reaction force received by a moving iron core in the prior art and the magnetic gap;

[0026] Figure 2 is another schematic diagram of the relationship between the suction force / reaction force received by a moving iron core in the prior art and the magnetic gap;

[0027] Figure 3 is an exploded view of the present invention in Embodiment 1 (the relay body is not shown);

[0028] Figure 4 is a top view of the present invention in Embodiment 1;

[0029] Figure 5 is the A-A cross-sectional view corresponding to the initial state of the first embodiment of the present invention;

[0030] Figure 6 is the first embodiment Figure 5 a magnified schematic view of part C therein;

[0031] Figure 7 is the B-B cross-sectional view corresponding to the initial state of the first embodiment of the present invention;

[0032] Figure 8 is the A-A cross-sectional view corresponding to the moment when the moving contact piece just contacts the static contact in the first embodiment of the present invention;

[0033] Figure 9 is the A-A cross-sectional view corresponding to the moment when the moving part moves upward to the limit position in the first embodiment of the present invention;

[0034] Figure 10 is the first embodiment Figure 9 a magnified schematic view of part D therein;

[0035] Figure 11 is the A-A cross-sectional view corresponding to the moment when the moving iron core moves upward to the limit position in the first embodiment of the present invention;

[0036] Figure 12 is the first embodiment Figure 11 a magnified schematic view of part E therein;

[0037] Figure 13 is a schematic diagram showing the relationship between the suction force / reaction force received by the moving iron core and the magnetic gap in the first embodiment of the present invention;

[0038] Figure 14 is the cross-sectional view of the second embodiment of the present invention in the initial state;

[0039] Figure 15 is the second embodiment Figure 12 a magnified schematic view of part F therein. Detailed implementation manners

[0040] The first embodiment

[0041] Please refer to Figures 3 - 13As shown in the figure, a high-voltage DC relay of the present invention includes a relay body, two static contacts 1, and a moving contact piece 6, a push rod 10, a magnetic circuit part, a first elastic member 13, a second elastic member 9, and a third elastic member 8 located inside the relay body. The magnetic circuit part includes a coil assembly 15, a moving iron core 14 located in the coil assembly 15, and a fixed component located above the moving iron core 14 and used for contact and cooperation with the moving iron core 14. A first elastic member 13 is arranged between the moving iron core 14 and the fixed component; the upper end of the push rod 10 is movably connected to the moving contact piece 6, and the lower end of the push rod 10 is fixedly connected to the moving iron core 6. The upper end of the second elastic member 9 abuts against the moving contact piece 6, and the lower end of the second elastic member 9 abuts against a first support portion 101 provided on the push rod 10. The present invention further includes a movable member 7, the movable member 7 is movably arranged on the push rod 10, the upper end of the third elastic member 9 abuts against the movable member 7, and the lower end of the third elastic member 9 abuts against a second support portion 102 provided on the push rod 10; after the moving contact piece 6 contacts the two static contacts 1, the movable member 7 moves upward relative to the moving contact piece 6 by a preset displacement and then stops moving upward with the push rod 10. The moving contact piece 6 is provided with a limiting structure for limiting the upward stroke of the movable member 7. After the movable member 7 moves upward relative to the moving contact piece 6 by a preset displacement, the vertically upward acting force transmitted to the moving contact piece 6 through the movable member 7 makes the contact pressure greater. The first support portion 101 is specifically an annular boss provided at a substantially middle position of the push rod 10, and the second support portion 102 is specifically an annular step provided at a substantially upper-middle position of the push rod 10.

[0042] In this embodiment, the moving contact piece 6 is provided with a through hole 61 for the top end of the push rod 10 to pass through. The movable member 7 is a sleeve body, which is sleeved outside the push rod 10 and is fitted inside the through hole 61, and there is a clearance fit between the movable member 7 and the hole wall of the through hole 61. The outer side surface of the movable member 7 is provided with a first limiting boss 71, and the limiting structure is a second limiting boss 611 provided on the hole wall of the through hole 61. The first limiting boss 71 is located below the second limiting boss 611 and the two cooperate with each other. The first limiting boss 71 and the second limiting boss 611 are both annular.

[0043] In this embodiment, a guiding barrel 11 is arranged inside the relay body. The top opening of the guiding barrel 11 is connected and cooperated with an inner support cover 2 located inside the relay body; the moving contact piece 6 is arranged in the guiding barrel 11 so as to be movable up and down. The bottom of the push rod 10 passes downward through the bottom of the guiding barrel 11. The two static contacts 1 are respectively arranged on the inner support cover 2, and the bottoms of the two static contacts 1 are respectively located inside the inner support cover 2.

[0044] In this embodiment, two ceramic covers 17 for blocking arcs are arranged in the guide barrel 11, and the two ceramic covers 17 respectively include an upper ceramic part 171 and a lower ceramic part 172 that are sealed by upper and lower joints. The inner support cover 2 is plugged with a plurality of magnetic steels 16, specifically, the number of the plurality of magnetic steels 16 is three, and the three magnetic steels 17 are distributed in the relationship of left, middle, and right.

[0045] In this embodiment, a micro switch 3 is provided in the relay body, and the movable contact piece 6 or the push rod 10 is connected with a toggle block 4 for triggering the micro switch 3. The micro switch 3 is specifically arranged on the inner support cover 2, and the toggle block 4 is specifically sleeved outside the push rod 10, and the upper side of the toggle block 4 is limited by a clip 5 sleeved on the push rod 10, and the lower side of the toggle block 4 is limited by a gasket 51 sleeved on the push rod 10; the movable member 7 is fitted under the gasket 51. After the top end of the push rod 10 passes through the through hole 61 of the movable contact piece 6, a limiting component is provided, and the limiting component is composed of the clip 5, the toggle block 4 and the gasket 51, but it is not limited thereto. In other embodiments, the limiting component is a clip.

[0046] In this embodiment, the first elastic member 13, the second elastic member 9 and the third elastic member 8 are respectively arranged outside the push rod 10, and the first elastic member 13, the second elastic member 9 and the third elastic member 8 are all springs, but not limited to this. In other embodiments, at least one of the first elastic member, the second elastic member and the third elastic member is an elastic sleeve that can be compressed along its axial direction.

[0047] In this embodiment, the fixing component is a first magnetic conductive sheet 12, which is located on the upper side of the coil assembly 15. In other embodiments, the fixing component is a static iron core, which is fixed to the bottom end of a first magnetic conductive sheet disposed in the relay body.

[0048] In this embodiment, the relay body includes a shell 18, an iron cup 19 and an upper cover 20. The iron cup 19 is arranged in the shell 18, and a second magnetic conductive sheet 21 is arranged between the outer bottom surface of the iron cup 19 and the inner bottom surface of the shell 18; the upper cover 20 is arranged at the top opening of the shell 18, and the tops of the two static contacts 1 are sealed through the upper cover 20 respectively. An exhaust copper pipe 23 is also arranged on the inner support cover 2, and the top of the exhaust copper pipe 23 is sealed through the upper cover 20. An oil-free bearing 22 is matched between the moving iron core 14 and the coil assembly 15. The coil assembly 15 includes a coil frame and a coil wound on the coil frame. The oil-free bearing 22 is sleeved in the coil frame, and the moving iron core 14 is sleeved in the oil-free bearing 22.

[0049] A high voltage DC relay of the present invention has an initial state as follows Figure 5 , Figure 6As shown, at this time, the moving iron core 14 is at the lowest position, the moving contact piece 6 is not in contact with the two static contact pieces 1, and the first elastic member 13, the second elastic member 9, and the third elastic member 8 are all in the initial pre-compressed state. When closing, the moving iron core 14 moves upward, driving the moving contact piece 6, the push rod 10 and the components thereon to move upward. At the same time, the first elastic member 13 is compressed until the moving contact piece 6 contacts the two static contact pieces 1, as Figure 8 shown. At this time, there is a certain gap between the moving iron core 14 and the first magnetic conductive sheet 12, as Figure 8 shown. As the moving iron core 14 drives the push rod 10 to continue moving upward, the second elastic member 9 begins to be compressed. Since the moving member 7 can move upward relative to the moving contact piece 6 by a preset displacement, therefore, before the moving member 7 moves upward to complete the preset displacement, the third elastic member 8 remains in the initial pre-compressed state. When the moving member 7 moves upward with the push rod 10 until its first limiting boss 71 contacts the second limiting boss 611 of the moving contact piece 6, the moving member 7 moves upward to the limit position, as Figure 9 、 Figure 10 shown. At this time, there is still a certain gap between the moving iron core 14 and the first magnetic conductive sheet 12, as Figure 9 shown. As the moving iron core 14 drives the push rod 10 to continue moving upward, the third elastic member 8 begins to be compressed until the moving iron core 14 moves upward to the limit position where it is attracted to the first magnetic conductive sheet 12, as Figure 11 、 Figure 12 shown. Therefore, during the closing process, the first elastic member 13, the second elastic member 9, and the third elastic member 8 are not compressed simultaneously, but are compressed successively. When the third elastic member 8 begins to be compressed, the moving iron core 14 has already moved upward to a position with a larger magnetic attraction force. Therefore, after the third elastic member 8 begins to be compressed, the reaction force on the moving iron core 14 (i.e., the sum of the elastic restoring forces of the first elastic member 13, the second elastic member 9, and the third elastic member 8) is always less than the suction force on the moving iron core 14. Thus, the moving iron core 14 can be attracted upward in place. At this time, the second elastic member 9 and the third elastic member 8 act on the moving contact piece 6 together to increase the contact pressure.

[0050] When disconnecting, the moving iron core 14 moves downward under the action of the reaction force, driving the push rod 10 and the moving contact piece 6 to move downward to disconnect the contact. During this process, the first elastic member 13, the second elastic member 9, and the third elastic member 8 all have reaction forces at the same time, accelerating the disconnection of the contact. The faster the contact disconnects, the shorter the arcing time.

[0051] For a high-voltage DC relay of the present invention, the relationship between the reaction force / suction force F on the moving iron core 14 and the magnetic gap is as Figure 13 shown. In the figure, the abscissa is the magnetic gap δ (mm), the ordinate is the force F (N), and the magnetic gap is the gap between the moving iron core 14 and the first magnetic conductive sheet 13. Figure 13The curve a in the figure represents the relationship between the suction force received by the moving iron core 14 and the magnetic gap under the rated voltage. The curve b represents the relationship between the suction force received by the moving iron core 14 and the magnetic gap under 50% of the rated voltage. The curve c represents the relationship between the suction force received by the moving iron core 14 and the magnetic gap under 10% of the rated voltage. Among them, the curve b is the corresponding curve in the normal working state of the relay. From these three curves, it can be obtained that: the smaller the magnetic gap, the smaller the air magnetic resistance, the greater the suction force, and when the magnetic gap approaches 0, the suction force is very large. Figure 9 The broken line d in the figure represents the relationship between the reaction force received by the moving iron core 14 and the magnetic gap. Among them, the reaction force corresponding to the line segment d1 is generated by the first elastic member 13, the reaction force corresponding to the line segment d2 is generated by the first elastic member 13 and the second elastic member 9, and the reaction force corresponding to the line segment d3 is jointly generated by the first elastic member 13, the second elastic member 9 and the third elastic member 8. That is, during the upward movement of the moving iron core 14, the magnetic gap gradually becomes smaller. First, the first elastic member 13 is compressed, then the second elastic member 9 is compressed, and finally, the third elastic member 8 is compressed. After the third elastic member 8 is compressed, the reaction force received by the moving iron core 14 increases. However, since during this process, the moving iron core 14 has moved to a position with a relatively large magnetic suction force, therefore, after the third elastic member 8 is compressed, the reaction force received by the moving iron core 14 (that is, the sum of the elastic restoring forces of the first elastic member 13, the second elastic member 9 and the third elastic member 8) is always smaller than the suction force received by the moving iron core 14, and the moving iron core 14 can be sucked up in place.

[0052] Therefore, a high-voltage DC relay of the present invention adopts a mode in which three elastic members (i.e., the first elastic member 13, the second elastic member 9, and the third elastic member 8) are successively compressed, which can not only greatly increase the contact pressure but also avoid the situation where the moving iron core fails to be sucked in place.

[0053] Embodiment 2

[0054] Please refer to Figure 14 、 Figure 15 As shown, the difference between a high-voltage DC relay of the present invention and the above Embodiment 1 is that: the upper stroke of the movable member 7 is limited by the bottom surface of the movable contact piece 6.

[0055] In this embodiment, the movable member 7 is also sleeved outside the push rod 10 and is fitted inside the through hole 61, and there is a clearance fit between the outer side surface of the movable member 7 and the hole wall of the through hole 61. A first limiting boss 71 located below the bottom surface of the movable contact piece 6 is provided on the outer side surface of the movable member 7, and the first limiting boss 71 is annular. When the movable member 7 moves upward until the first limiting boss 71 contacts the bottom surface of the movable contact piece 6, the movable member 7 moves to the limit position. The third elastic member 8 is located below the through hole 61.

[0056] The working principle of a high-voltage DC relay of the present invention is as described above and will not be elaborated here.

[0057] The above embodiments are only used to further illustrate a high-voltage DC relay of the present invention. However, the present invention is not limited to the embodiments. Any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-voltage DC relay, comprising a relay body, two static contacts, and a moving contact piece, a push rod, a magnetic circuit part, a first elastic member, a second elastic member, and a third elastic member located within the relay body. The magnetic circuit part includes a coil assembly, a moving iron core located within the coil assembly, and a fixed member located above the moving iron core and adapted to be in contact and cooperation with the moving iron core. A first elastic member is disposed between the moving iron core and the fixed member, and is adapted to be compressed when the moving iron core moves upward. The upper end of the push rod is movably connected to the moving contact piece, and the lower end of the push rod is fixedly connected to the moving iron core. The upper end of the second elastic member abuts against the moving contact piece, and the lower end of the second elastic member abuts against a first support portion provided on the push rod. It is characterized in that: It also includes a movable part, which is movably arranged on the push rod, the upper end of the third elastic part abuts against the movable part, and the lower end of the third elastic part abuts against the second supporting part arranged on the push rod; after the moving contact piece contacts the two static contacts, the movable part moves upward relative to the moving contact piece for a preset displacement and then stops moving upward with the push rod.

2. The high-voltage DC relay according to claim 1, characterized in that: The movable contact piece is provided with a through hole for the top end of the push rod to pass through, and the movable part is sleeved outside the push rod; the movable contact piece is provided with a limit structure for limiting the upper travel of the movable part.

3. The high-voltage DC relay according to claim 2, wherein: The movable part is fitted on the inner side of the through hole, and there is a clearance fit between the movable part and the hole wall of the through hole; a first limiting boss is provided on the outer side of the movable part, and the limiting structure is a second limiting boss provided on the hole wall of the through hole, the first limiting boss is located below the second limiting boss, and the two are fitted with each other.

4. The high-voltage DC relay according to claim 1, wherein: The movable contact piece is provided with a through hole for the top end of the push rod to pass through, and the movable part is sleeved outside the push rod; the movable contact piece limits the upward stroke of the movable part through its bottom surface.

5. The high-voltage DC relay according to claim 1, wherein: A guide barrel is arranged in the relay body, and the top opening of the guide barrel is connected and matched with the inner support cover located in the relay body; the moving contact piece is arranged in the guide barrel so as to be movable up and down, and the bottom of the push rod passes downward through the bottom of the guide barrel, and the two static contacts are respectively arranged in the inner support cover, and the bottoms of the two static contacts are respectively located in the inner support cover.

6. The high-voltage DC relay according to claim 5, wherein: Two ceramic covers for blocking electric arc are arranged in the guide barrel, and the two ceramic covers respectively include an upper ceramic part and a lower ceramic part which are butt-jointed and sealed; a plurality of magnetic steels are inserted in the inner support cover.

7. The high-voltage DC relay according to claim 1, characterized in that: A micro switch is arranged in the relay body, and the moving contact piece or the push rod is connected with a toggle block for triggering the micro switch.

8. The high-voltage DC relay according to claim 7, wherein: The toggle block is sleeved outside the push rod, and the upper side of the toggle block is limited by a clamping spring sleeved on the push rod, and the lower side of the toggle block is limited by a gasket sleeved on the push rod; the movable part is fitted under the gasket.

9. The high-voltage DC relay according to claim 1, characterized in that: The first elastic member, the second elastic member and the third elastic member are respectively sleeved outside the push rod, and the first elastic member, the second elastic member and the third elastic member are all springs.

10. The high-voltage DC relay according to claim 1, characterized in that: The fixed component is a first magnetic conductive sheet, or the fixed component is a static iron core, which is fixed to the bottom end of a first magnetic conductive sheet arranged in the relay body; the relay body includes an outer shell, an iron cup and an upper cover, the iron cup is arranged in the outer shell, and a second magnetic conductive sheet is arranged between the outer bottom surface of the iron cup and the inner bottom surface of the outer shell; the upper cover is arranged at the top opening of the outer shell, and the tops of the two static contacts are sealed and pass through the upper cover respectively.

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