Multi-sealing structure for high-voltage direct-current relay

Abstract

The invention discloses a multi-sealing structure for a high-voltage direct-current relay, and relates to the technical field of relay sealing structures, the multi-sealing structure comprises a round shell, a relay main body, two L-shaped copper sheets and a round cover, the bottom of the inner wall of the round shell is provided with the relay main body, the two L-shaped copper sheets are fixed on two sides of the top surface of the relay main body, and the round cover is slidably mounted above the inner wall of the round shell. A groove is formed in the bottom of the round cover, the two bolt columns penetrate through and are fixed to the two sides of the top face of the round cover, the barrel cap penetrates through and is fixed to the top face of the round cover, the two copper wires penetrate through and are fixed to the back face of the barrel cap, and the bottom ends of the two copper wires are fixedly connected with the top face of the relay body. The inert gas in the groove of the round cover and the gap of the convex ring is isolated through the sealing ring, so that the problem that the inert gas in the high-voltage direct-current relay is easy to leak to cause electric arc in the high-voltage direct-current relay is solved.

Description

Technical Field

[0001] This invention relates to the field of relay sealing structure technology, specifically a multi-seal structure for a high-voltage DC relay. Background Technology

[0002] High-voltage DC relays are switching elements used to connect, disconnect, and control high-voltage DC circuits. The main function of the multi-seal structure of high-voltage DC relays is to isolate external moisture and contaminants, ensuring high-voltage insulation.

[0003] Patent CN216120092U discloses a high-voltage DC relay technology, providing a multi-seal structure for a high-voltage DC relay, including a sealing cover, a relay body, and a sealing cap. The relay body is housed inside the sealing cover, and the sealing cap is located on top of the sealing cover. Terminals are located on both sides of the bottom of the sealing cap, with the tops of the terminals extending through the bottom to the top of the sealing cap. Heat dissipation structures are provided on both sides and ends of the sealing cover, and a reinforcing structure is provided on the inner wall of the sealing cover. This patent utilizes an auxiliary structure and an interference fit between the sealing block and the sealing cover to ensure a tighter connection when the sealing cap is installed on top of the sealing cover. Simultaneously, a sealing ring on the outer bottom of the sealing cap acts at the connection point between the sealing cover and the sealing cap, improving the sealing effect at the connection. The sealing block and sealing ring enhance the sealing performance of this sealing structure.

[0004] However, current high-voltage DC relays have the following problems: during use, the inert gas inside the high-voltage DC relay is prone to leakage, which can lead to arcing inside the relay. Furthermore, the connection between the round shell and the round cover is not tight, which can cause the round cover to loosen inside the round shell. At the same time, the high temperature of the relay body inside the round shell is not easily detected, which can lead to users not noticing the relay body burning out in time. Therefore, we propose a multi-seal structure for high-voltage DC relays. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a multi-seal structure for high-voltage DC relays, solving the problems mentioned in the background section.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a multi-seal structure for a high-voltage DC relay, comprising: a circular shell, wherein a relay body is disposed at the bottom of the inner wall of the circular shell; two L-shaped copper plates, the two L-shaped copper plates being fixed to both sides of the top surface of the relay body; a circular cover, the circular cover being slidably mounted on the upper part of the inner wall of the circular shell, the bottom of the circular cover having a groove; two bolt posts, the two bolt posts penetrating and fixed to both sides of the top surface of the circular cover; a cylindrical cap, the cylindrical cap penetrating and fixed to the top surface of the circular cover; two copper wires, the two copper wires penetrating and fixed to the back of the cylindrical cap, the bottom ends of the two copper wires being fixedly connected to the top surface of the relay body; a square plate, the square plate being fixed in the middle of the top surface of the circular cover; two circular tubes, the two circular tubes being fixed to the left and right sides of the square plate; and two... A copper wire and a convex ring are slidably installed inside the circular tube. The convex ring is fixed to the top surface of the inner wall of the circular shell, and the top surface of the convex ring is on the movement trajectory of the groove inside the circular cover. A sealing ring is fixed to the lower part of the outer wall of the circular cover. When the circular cover is pressed down, the circular cover moves the bolt column downward. During the downward movement, the bolt column enters the circular hole of the L-shaped copper sheet. The circular cover moves the cylindrical cap downward, and the cylindrical cap moves the copper wire downward. The circular cover moves the square plate downward, and the square plate moves the circular tube downward. The circular tube moves the copper wire downward. The groove of the circular cover moves downward to the convex ring, and the groove of the circular cover fits into the convex ring to seal. The circular cover moves the sealing ring downward, and the sealing ring slides downward on the inner wall of the circular shell. The sealing ring is used to seal the gap between the inner wall of the circular shell and the outer wall of the circular cover.

[0007] According to the above technical solution, a base is provided at the bottom of the outer wall of the circular shell, and through holes are provided on both sides of the top surface of the base. The through holes are used to fix the base in the mechanical equipment.

[0008] According to the above technical solution, the L-shaped copper sheet on the left is the positive electrode, the L-shaped copper sheet on the right is the negative electrode, and a round hole is opened on the top surface of each of the two L-shaped copper sheets. The two bolts are slidably installed on the inner wall of the round hole of the two L-shaped copper sheets.

[0009] According to the above technical solution, the relay body is located in the middle, the cylinder cap has two chambers, the copper wire is located above the round cover, and the square plate is located on the back of the cylinder cap.

[0010] According to the above technical solution, fastening devices are provided on both sides of the top surface of the round cover. The fastening devices are used to fasten the round shell and the round cover. A monitoring device is provided on the inner wall of the fastening device. The monitoring device is used to monitor the temperature of the outer wall of the round shell.

[0011] According to the above technical solution, the fastening device includes: two corner brackets fixed on both sides of the top surface of the round cover; a U-shaped frame fixed on the opposite side of the two corner brackets; a cylinder fixed on the bottom surface of the two U-shaped frames, with a self-locking threaded groove on the bottom of the outer wall of the cylinder; a hole bracket fixed on the left and right sides of the round cover; and nuts rotatably installed on the outer wall of the self-locking threaded groove of the two cylinders. The U-shaped frame drives the cylinder to move downwards, and the cylinder enters the hole bracket during the downward movement. Nuts are screwed onto the surface of the self-locking threaded groove of the cylinder, with the top of the nut tightly abutting against the bottom of the hole bracket. The nut fastens the cylinder through the hole bracket.

[0012] According to the above technical solution, a ring frame is fixed to the bottom of the outer wall of each of the two cylinders, a thin rod is fixed to the bottom surface of each of the two ring frames, and an arc baffle is embedded in the bottom surface of each of the two thin rods. The ring frame drives the thin rod to move downward, and the thin rod drives the arc baffle to move downward. During the downward movement, the arc baffle covers the nut.

[0013] According to the above technical solution, the two hole frames are located above the base, and the outer walls of the two hole frames are provided with hollow grooves to reduce the weight of the hole frames. A round hole is opened on the front of each of the two ring frames.

[0014] According to the above technical solution, the monitoring device includes: a round rod, which is fixed to the inner wall of the round hole of two rings respectively; a semi-arc plate, which is fixed to the outer wall of the two round rods and is located behind the round shell; a long shell, which passes through and is fixed in the middle of the back of the semi-arc plate; and a temperature sensor, which is fixedly installed at the bottom of the inside of the long shell. The round rod drives the semi-arc plate to move downward, the semi-arc plate drives the long shell to move downward, and the long shell drives the temperature sensor to move downward. The temperature sensor moves to the back of the round shell and is used to monitor the temperature of the outer wall of the round shell.

[0015] According to the above technical solution, a U-shaped rod is respectively passed through and fixed to the outer wall of the two round rods. A ring plate is fixed to the back of each of the two U-shaped rods. The two ring plates are respectively sleeved on the outer wall of the two round rods. Two springs are arranged between the back of the two ring plates and the front of the semi-arc plate. The two springs are respectively sleeved on the outer wall of the two round rods. The two springs are respectively in a compressed state. The round rod drives the U-shaped rod to move downward, the U-shaped rod drives the ring plate to move downward, and the ring plate drives the spring to move downward. The elastic force of the spring compression reduces the vibration frequency of the semi-arc plate.

[0016] This invention provides a multi-seal structure for a high-voltage DC relay. It has the following advantages: (1) The present invention uses a round shell, a relay body, an L-shaped copper sheet, a round cover, a bolt post, a cylindrical cap, a copper wire, a square plate, a round tube, and a convex ring in conjunction with a sealing ring to press the round cover down. The round cover drives the bolt post to move down. During the downward movement, the bolt post enters the round hole of the L-shaped copper sheet. The round cover drives the cylindrical cap to move down. The cylindrical cap drives the copper wire to move down. The round cover drives the square plate to move down. The square plate drives the round tube to move down. The round tube drives the copper wire to move down. The groove of the round cover moves down to the convex ring. The groove of the round cover fits into the convex ring for sealing. The round cover drives the sealing ring to move down. The sealing ring slides down on the inner wall of the round shell. The sealing ring isolates the inert gas in the groove of the round cover and the gap of the convex ring, preventing the inert gas in the high voltage DC relay from easily leaking and causing an electric arc inside the high voltage DC relay.

[0017] (2) The present invention uses a fastening device to make the corner frame, the loop frame, the cylinder and the hole frame cooperate with the nut. The loop frame drives the cylinder to move downward. During the downward movement, the cylinder enters the hole frame. The nut is screwed on the self-locking threaded groove surface of the cylinder. The top of the nut is tightly pressed against the bottom of the hole frame to prevent the round shell and the round cover from being loose and causing the round cover to loosen in the round shell.

[0018] (3) The present invention, through the setting of the fastening device, makes the ring frame and the thin rod cooperate with the arc baffle. The ring frame drives the thin rod to move downward, and the thin rod drives the arc baffle to move downward. During the downward movement, the arc baffle covers the nut to prevent the nut below the hole frame from being easily bumped and causing the nut to loosen.

[0019] (4) By setting up a monitoring device, the present invention enables the round rod, the semi-arc plate and the long shell to work together with the temperature sensor. The round rod drives the semi-arc plate to move downward, the semi-arc plate drives the long shell to move downward, and the long shell drives the temperature sensor to move downward. The temperature sensor moves to the back of the round shell and monitors the surface temperature of the round shell in real time, preventing the relay body from being too hot and difficult to detect, which could lead to the relay body burning out and the problem not being detected in time.

[0020] (5) By setting up a monitoring device, the U-shaped rod and the ring plate cooperate with the spring. The round rod drives the U-shaped rod to move downward, the U-shaped rod drives the ring plate to move downward, and the ring plate drives the spring to move downward. Through the elastic force of the spring compression, the vibration frequency of the semi-arc plate is reduced, preventing the temperature sensor from being easily damaged by excessive vibration due to the high vibration frequency of the semi-arc plate. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the entire invention; Figure 2 This is a schematic diagram of the internal components of the present invention; Figure 3 This is a cross-sectional view of the circular shell of the present invention; Figure 4 For the present invention Figure 3A magnified view of a portion of point A in the middle; Figure 5 This is a schematic diagram of the fastening device of the present invention; Figure 6 For the present invention Figure 5 A magnified view of a portion of point B in the middle; Figure 7 This is a schematic diagram of the monitoring device of the present invention; Figure 8 For the present invention Figure 7 A magnified view of a portion of point C.

[0022] In the diagram: 1. Round shell; 101. Base; 102. Through hole; 2. Relay body; 3. L-shaped copper sheet; 4. Round cover; 5. Bolt post; 6. Cylinder cap; 7. Copper wire; 8. Square plate; 9. Round tube; 10. Convex ring; 11. Sealing ring; 12. Fastening device; 121. Angle bracket; 122. U-shaped frame; 123. Cylindrical; 124. Hole bracket; 125. Nut; 126. Ring bracket; 127. Thin rod; 128. Arc baffle; 13. Monitoring device; 131. Round rod; 132. Semi-arc plate; 133. Long shell; 134. Temperature sensor; 135. U-shaped rod; 136. Ring plate; 137. Spring. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Please see Figures 1-8 One embodiment of the present invention is: a multi-seal structure for a high-voltage DC relay, comprising: a circular shell 1, a base 101 provided at the bottom of the outer wall of the circular shell 1, and through holes 102 provided on both sides of the top surface of the base 101, the through holes 102 being used to fix the base 101 in a mechanical device; A relay body 2 is provided at the bottom of the inner wall of the round shell 1, and two L-shaped copper plates 3 are fixed on both sides of the top surface of the relay body 2. The left L-shaped copper plate 3 is the positive terminal and the right L-shaped copper plate 3 is the negative terminal. A round hole is opened on the top surface of each of the two L-shaped copper plates 3. A round cover 4 is slidably installed on the upper part of the inner wall of the round shell 1. A groove is opened at the bottom of the round cover 4. Two bolt posts 5 are inserted and fixed on both sides of the top surface of the round cover 4. The two bolt posts 5 are slidably installed on the inner wall of the round hole of the two L-shaped copper plates 3. A cylindrical cap 6 is inserted through and fixed to the top surface of the round cover 4. Two copper wires 7 are inserted through and fixed to the back of the cylindrical cap 6. The bottom ends of the two copper wires 7 are fixedly connected to the top surface of the relay body 2. A square plate 8 is fixed in the middle of the top surface of the round cover 4. The relay body 2 is located in the middle of the interior. Two chambers are opened inside the cylindrical cap 6. The copper wires 7 are located above the round cover 4. The square plate 8 is located on the back of the cylindrical cap 6. Two round tubes 9 are fixed to the left and right sides of the square plate 8. A copper wire 7 is slidably installed inside each of the two round tubes 9. A convex ring 10 is fixed to the top surface of the inner wall of the round shell 1. The top surface of the convex ring 10 is located on the movement trajectory of the inner wall of the groove of the round cover 4. A sealing ring 11 is fixed to the lower part of the outer wall of the round cover 4. The sealing ring 11 is used to seal the gap between the inner wall of the round shell 1 and the outer wall of the round cover 4. In use, the circular shell 1 supports the relay body 2. The operator installs two copper wires 7 on the relay body 2, with the left copper wire 7 being the positive terminal and the right copper wire 7 being the negative terminal. Inert gas is then introduced into the circular shell 1. The operator quickly places the circular cover 4 over the circular shell 1 and presses it downwards. The circular cover 4 causes the bolt 5 to move downwards, entering the circular hole of the L-shaped copper sheet 3. Simultaneously, the circular cover 4 causes the cylindrical cap 6 to move downwards, which in turn causes the copper wires 7 to move downwards. The circular cover 4 also causes the square plate 8 to move downwards, which in turn causes the circular tube 9 to move downwards. The circular tube 9 then... Copper wire 7 moves downward, and round tube 9 limits copper wire 7. The groove of round cover 4 moves downward to the convex ring 10. The groove of round cover 4 fits into the convex ring 10 for sealing. Round cover 4 drives sealing ring 11 to move downward. Sealing ring 11 slides downward on the inner wall of round shell 1. Sealing ring 11 isolates the inert gas in the groove of round cover 4 and the gap of convex ring 10, thereby avoiding the problem that the inert gas in high voltage DC relay is prone to leakage and causes electric arc inside high voltage DC relay during use. Round shell 1 supports base 101. Operator installs bolts in through hole 102 to fix base 101 in mechanical equipment. Fastening devices 12 are provided on both sides of the top surface of the round cover 4. The fastening devices 12 are used to fasten the round shell 1 and the round cover 4. A monitoring device 13 is provided on the inner wall of the fastening device 12. The monitoring device 13 is used to monitor the temperature of the outer wall of the round shell 1.

[0025] Working principle: The circular shell 1 supports the relay body 2. Two copper wires 7 are installed on the relay body 2, with the left copper wire 7 being the positive terminal and the right copper wire 7 being the negative terminal. Inert gas is filled into the circular shell 1, and the circular cover 4 is quickly placed inside the circular shell 1. The circular cover 4 is pressed downwards, causing the bolt 5 to move downwards. During the downward movement, the bolt 5 enters the circular hole of the L-shaped copper sheet 3, connecting with the L-shaped copper sheet 3. The circular cover 4 causes the cylindrical cap 6 to move downwards, which in turn causes the copper wires 7 to move downwards. The circular cover 4 then causes the square plate 8 to move downwards. The square plate 8 moves the round tube 9 downward, which in turn moves the copper wire 7 downward. The round tube 9 limits the movement of the copper wire 7. The groove of the round cover 4 moves downward onto the convex ring 10. The groove of the round cover 4 fits into the convex ring 10 for sealing. The round cover 4 moves the sealing ring 11 downward. The sealing ring 11 slides downward on the inner wall of the round shell 1. The sealing ring 11 isolates the inert gas in the gap between the groove of the round cover 4 and the convex ring 10. The round shell 1 supports the base 101. Bolts are installed in the through hole 102 to fix the base 101 in the mechanical equipment.

[0026] Please see Figures 1-8 Based on the above embodiments, in another embodiment of the present invention, the fastening device 12 includes: two corner brackets 121, which are fixed on both sides of the top surface of the round cover 4; a loop frame 122, which is fixed on the side of the two corner brackets 121 that is far apart from each other; a cylinder 123, which is fixed on the bottom surface of the two loop frames 122, and a self-locking threaded groove is provided on the bottom of the outer wall of the cylinder 123; a hole bracket 124, which is fixed on the left and right sides of the round shell 1, and the two hole brackets 124 are located above the base 101, and the outer wall of the two hole brackets 124 is provided with a hollowed-out groove to reduce the weight of the hole brackets 124; and a nut 125, which is rotatably installed on the outer wall of the self-locking threaded groove of the two cylinders 123, and the nut 125 fastens the cylinders 123 through the hole brackets 124. As the round cover 4 moves the bolt column 5 downward, the round cover 4 moves the angle bracket 121 downward, the angle bracket 121 moves the loop frame 122 downward, and the loop frame 122 moves the cylinder 123 downward. During the downward movement, the cylinder 123 enters the hole frame 124. The operator screws the nut 125 onto the self-locking threaded groove surface of the cylinder 123. The nut 125 is tightly pressed against the bottom of the hole frame 124, so that the round cover 4 is tightly covered on the round shell 1. This avoids the problem of the round cover 4 becoming loose in the round shell 1 due to the loose connection between the round shell 1 and the round cover 4 when the high voltage DC relay is in use.

[0027] A ring frame 126 is fixed to the bottom of the outer wall of each of the two cylinders 123. A round hole is opened on the front of each of the two ring frames 126. A thin rod 127 is fixed to the bottom of each of the two ring frames 126. An arc baffle 128 is embedded in the bottom of each of the two thin rods 127. As the U-shaped frame 122 moves the cylinder 123 downward, the cylinder 123 moves the ring frame 126 downward, the ring frame 126 moves the thin rod 127 downward, and the thin rod 127 moves the arc baffle 128 downward. During the downward movement, the arc baffle 128 covers the nut 125, thus preventing the nut 125 below the hole frame 124 from being easily bumped and loosened when the high voltage DC relay is in use.

[0028] The monitoring device 13 includes: a round rod 131, which is fixed to the inner wall of the round hole of the two ring frame 126 respectively; a semi-arc plate 132, which is fixed to the outer wall of the two round rods 131 and is located behind the round shell 1; a long shell 133, which is inserted through and fixed to the middle of the back of the semi-arc plate 132; and a temperature sensor 134, which is fixedly installed at the bottom of the inside of the long shell 133 and is used to monitor the temperature of the outer wall of the round shell 1. As the cylinder 123 drives the ring frame 126 to move downwards, the ring frame 126 drives the round rod 131 to move downwards, the round rod 131 drives the semi-arc plate 132 to move downwards, the semi-arc plate 132 drives the long shell 133 to move downwards, and the long shell 133 drives the temperature sensor 134 to move downwards. The temperature sensor 134 moves to the back of the round shell 1 and monitors the surface temperature of the round shell 1 in real time. This avoids the problem that the high voltage DC relay body 2 is not easily detected when it is overheated, which may cause the relay body 2 to burn out and be detected in time.

[0029] A U-shaped rod 135 is passed through and fixed to the outer wall of each of the two round rods 131. A ring plate 136 is fixed to the back of each of the two U-shaped rods 135. The two ring plates 136 are respectively fitted onto the outer wall of the two round rods 131. Two springs 137 are provided between the back of the two ring plates 136 and the front of the semi-arc plate 132. The two springs 137 are respectively fitted onto the outer wall of the two round rods 131 and are in a compressed state. While the round rod 131 drives the semi-arc plate 132 to move downward, the round rod 131 drives the U-shaped rod 135 to move downward, the U-shaped rod 135 drives the ring plate 136 to move downward, and the ring plate 136 drives the spring 137 to move downward. Through the elastic force of the spring 137 compression, the vibration frequency of the semi-arc plate 132 is reduced, thereby avoiding the problem that the temperature sensor 134 is easily damaged by vibration when the high voltage DC relay is in use due to the excessive vibration frequency of the semi-arc plate 132.

[0030] Working principle: The round cover 4 drives the corner bracket 121 to move downward, the corner bracket 121 drives the loop frame 122 to move downward, the loop frame 122 drives the cylinder 123 to move downward, and the cylinder 123 enters the hole frame 124 during the downward movement. The nut 125 is screwed on the self-locking threaded groove surface of the cylinder 123, and the top of the nut 125 is tightly pressed against the bottom of the hole frame 124. The cylinder 123 drives the ring frame 126 to move downward, the ring frame 126 drives the thin rod 127 to move downward, the thin rod 127 drives the arc baffle 128 to move downward, and the arc baffle 128 covers the nut 125 during the downward movement. The ring frame 126 drives the round rod 131 to move downward, the round rod 131 drives the semi-arc plate 132 to move downward, the semi-arc plate 132 drives the long shell 133 to move downward, the long shell 133 drives the temperature sensor 134 to move downward, the temperature sensor 134 moves to the back of the round shell 1, and the temperature sensor 134 monitors the surface temperature of the round shell 1 in real time. The round rod 131 drives the U-shaped rod 135 to move downward, the U-shaped rod 135 drives the ring plate 136 to move downward, and the ring plate 136 drives the spring 137 to move downward. The elastic force of the spring 137 reduces the vibration frequency of the semi-arc plate 132.

[0031] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A multi-seal structure for a high-voltage DC relay, characterized in that, include: A circular shell (1) has a relay body (2) disposed at the bottom of the inner wall of the circular shell (1); Two L-shaped copper pieces (3) are fixed on both sides of the top surface of the relay body (2); A round cover (4) is slidably mounted on the inner wall of the round shell (1), and a groove is provided at the bottom of the round cover (4); Two bolt posts (5) are inserted through and fixed on both sides of the top surface of the round cover (4); A cylindrical cap (6) is inserted through and fixed to the top surface of a round cover (4); Two copper wires (7) are inserted through and fixed on the back of the cap (6), and the bottom ends of the two copper wires (7) are fixedly connected to the top surface of the relay body (2).

2. Square plate (8), which is fixed in the middle of the top surface of the round cover (4); Two round tubes (9) are fixed on the left and right sides of the square plate (8), and a copper wire (7) is slidably installed inside each of the two round tubes (9). A convex ring (10) is fixed on the top surface of the inner wall of the round shell (1), and the top surface of the convex ring (10) is on the movement trajectory of the inner wall of the groove of the round cover (4). A sealing ring (11) is fixed below the outer wall of the round cover (4). The sealing ring (11) is used to seal the gap between the inner wall of the round shell (1) and the outer wall of the round cover (4).

3. The multi-seal structure for a high-voltage DC relay according to claim 1, characterized in that: The bottom of the outer wall of the round shell (1) is provided with a base (101), and the top surface of the base (101) is provided with through holes (102) on both sides. The through holes (102) are used to fix the base (101) in the mechanical equipment.

4. The multi-seal structure for a high-voltage DC relay according to claim 2, characterized in that: The L-shaped copper sheet (3) on the left is the positive electrode, and the L-shaped copper sheet (3) on the right is the negative electrode. A round hole is opened on the top surface of each of the two L-shaped copper sheets (3), and the two bolts (5) are slidably installed on the inner wall of the round hole of the two L-shaped copper sheets (3).

5. The multi-seal structure for a high-voltage DC relay according to claim 3, characterized in that: The relay body (2) is located in the middle of the interior. The cap (6) has two chambers inside. The copper wire (7) is located above the round cover (4). The square plate (8) is located on the back of the cap (6).

6. The multi-seal structure for a high-voltage DC relay according to claim 4, characterized in that: The top surface of the round cover (4) is provided with fastening devices (12) on both sides, and the fastening devices (12) are used to fasten the round shell (1) and the round cover (4). The inner wall of the fastening device (12) is provided with a monitoring device (13), which is used to monitor the temperature of the outer wall of the round shell (1).

7. The multi-seal structure for a high-voltage DC relay according to claim 5, characterized in that: The fastening device (12) includes two corner brackets (121), which are fixed on both sides of the top surface of the round cover (4); A loop frame (122) is fixed to one side of each of the two corner brackets (121) that are far apart from each other; A cylinder (123) is fixed to the bottom surface of two loop frames (122) respectively, and a self-locking threaded groove is provided on the bottom of the outer wall of the cylinder (123); Hole frame (124), the hole frame (124) is fixed on the left and right sides of the circular shell (1); Nuts (125) are rotatably mounted on the outer walls of the self-locking threaded grooves of two cylinders (123); The nut (125) secures the cylinder (123) through the hole holder (124).

8. The multi-seal structure for a high-voltage DC relay according to claim 6, characterized in that: A ring frame (126) is fixed to the bottom of the outer wall of each of the two cylinders (123), a thin rod (127) is fixed to the bottom surface of each of the two ring frames (126), and an arc baffle (128) is embedded in the bottom surface of each of the two thin rods (127).

9. The multi-seal structure for a high-voltage DC relay according to claim 7, characterized in that: The two hole frames (124) are located above the base (101). The outer walls of the two hole frames (124) are provided with hollow grooves to reduce the weight of the hole frames (124). The front of the two ring frames (126) is respectively provided with a round hole.

10. The multi-seal structure for a high-voltage DC relay according to claim 8, characterized in that: The monitoring device (13) includes: a round rod (131), which is fixed to the inner wall of the round hole of each of the two ring frames (126); A semi-arc plate (132) is fixed to the outer wall of two round rods (131) and the semi-arc plate (132) is located behind the round shell (1); A long shell (133) is inserted through and fixed in the middle of the back of the semi-arc plate (132); Temperature sensor (134), the temperature sensor (134) is fixedly installed at the bottom of the inside of the long shell (133); The temperature sensor (134) is used to monitor the temperature of the outer wall of the cylindrical shell (1).

11. The multi-seal structure for a high-voltage DC relay according to claim 9, characterized in that: A U-shaped rod (135) is passed through and fixed to the outer wall of each of the two round rods (131). A ring plate (136) is fixed to the back of each of the two U-shaped rods (135). The two ring plates (136) are respectively fitted onto the outer wall of the two round rods (131). Two springs (137) are provided between the back of the two ring plates (136) and the front of the semi-arc plate (132). The two springs (137) are respectively fitted onto the outer wall of the two round rods (131) and are respectively in a compressed state.

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