DC Relay Auxiliary Contact System

Abstract

An auxiliary contact system of a DC relay, which comprises a housing assembly and a static contact mechanism, a moving contact mechanism, an auxiliary contact system and a circuit module arranged in the housing assembly. The static contact mechanism includes two static contacts. The moving contact mechanism includes a moving contact bridge. The moving contact mechanism can drive the moving contact bridge to contact and separate from the two static contacts. The auxiliary contact system includes at least one auxiliary contact mechanism arranged on one side of the moving contact mechanism. Each auxiliary contact mechanism respectively includes a lever and at least two cooperating reeds. The circuit module is provided with an indication circuit connected to at least two reeds. One end of the lever is connected to the moving contact mechanism, and the other end of the lever cooperates with at least one reed. When the moving contact mechanism acts, it drives at least one reed through the lever to make the two reeds contact or separate, thereby turning on or off the indication circuit. The working state of the moving contact mechanism is indicated through the cooperation of the reeds and the lever, which not only has a simple structure but also high sensitivity.

Description

Technical Field

[0001] The present invention relates to the field of relays, and particularly to an auxiliary contact system for a DC relay. Background Art

[0002] High-voltage DC relays are mainly used in the new energy field, specifically in the charging and discharging systems of charging piles and the charging and discharging systems of new energy vehicles. To improve the energy utilization rate of the entire system, the rated working voltage of the above systems is generally 450VDC - 750VDC, and there is a further increase to a rated working voltage of 950VDC.

[0003] Existing high-voltage DC relays usually have a closed and sealed structure to improve the arc extinguishing ability, resulting in difficulty in confirming the internal operating state of the high-voltage DC relay. Although the internal operating state of the high-voltage DC relay can be indicated by driving a micro switch through mechanical linkage or magnetic coupling, the mechanical linkage method has problems such as a large volume of the micro switch, large limitations on the installation position, and low reliability, while the magnetic coupling method is easily affected by power frequency interference, having problems such as low sensitivity and high assembly difficulty. Summary of the Invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide an auxiliary contact system for a DC relay with a simple structure and high reliability.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An auxiliary contact system for a DC relay, which includes a housing assembly and a static contact mechanism, a moving contact mechanism, an auxiliary contact system, and a circuit module arranged in the housing assembly. The static contact mechanism includes two static contacts. The moving contact mechanism includes a moving contact bridge. The moving contact mechanism can drive the moving contact bridge to contact and separate from the two static contacts. The auxiliary contact system includes at least one auxiliary contact mechanism arranged on one side of the moving contact mechanism. Each auxiliary contact mechanism includes a lever and at least two cooperating reeds. The circuit module is provided with an indication circuit connected to at least two reeds. One end of the lever is connected to the moving contact mechanism, and the other end of the lever cooperates with at least one reed. When the moving contact mechanism moves, it drives at least one reed through the lever to make the two reeds contact or separate, thereby conducting or disconnecting the indication circuit.

[0007] Preferably, it further includes an electromagnetic system. The electromagnetic system includes a starting coil and a holding coil connected in series. Both ends of the holding coil are respectively connected to at least two reeds of the auxiliary contact mechanism. When the electromagnetic system is powered on, the electromagnetic system drives the moving contact mechanism to move the moving contact bridge, and at the same time, the holding coil is short-circuited by the two reeds. After the electromagnetic system is powered on, the lever connected to the moving contact mechanism separates the two reeds, connecting the starting coil and the holding coil in series.

[0008] Preferably, the dynamic contact mechanism includes a main shaft, a dynamic contact bridge and an insulating mechanism. One end of the main shaft cooperates with the electromagnetic system, and the other end of the main shaft cooperates with the dynamic contact bridge. The electromagnetic system can drive the main shaft to drive the dynamic contact bridge to contact or separate with the static contact. The shift rod is connected to the insulating mechanism.

[0009] Preferably, the insulating mechanism includes a middle insulating sleeve with a hollow structure, and an upper insulating sleeve and a lower insulating sleeve respectively arranged at both ends of the middle insulating sleeve, the middle insulating sleeve is arranged between the outer side of the main shaft and the inner side of the main shaft hole of the moving contact bridge, the upper insulating sleeve is located on the side of the moving contact bridge close to the static contact, and the shift rod is connected to the upper insulating sleeve.

[0010] Preferably, it includes two springs, which are a static spring and a dynamic spring respectively connected to the circuit module. The dynamic spring is longer than the static spring. The end of the static spring close to the shift rod is spaced apart from the shift rod, and the end of the dynamic spring close to the shift rod extends to one side of the shift rod for cooperation.

[0011] Preferably, it includes three springs, which are an upper spring, a lower spring and a middle spring respectively connected to the circuit module. The upper spring and the lower spring are arranged opposite to each other and are respectively located on both sides of one end of the middle spring. The other end of the middle spring is connected to the circuit module. The middle part of the middle spring cooperates with the lever. When the lever moves, it pushes the middle part of the middle spring to make the middle spring contact with the upper spring or the lower spring.

[0012] Preferably, a second auxiliary contact mechanism is further included. The second auxiliary contact mechanism and the auxiliary contact mechanism have the same structure. The movable springs of the second auxiliary contact mechanism and the auxiliary contact mechanism are respectively arranged on both sides of their respective levers along the moving direction of the movable contact mechanism. The lever of the auxiliary contact mechanism and the lever of the second auxiliary contact mechanism are arranged at the same height, and the dynamic contact mechanism can drive the lever of the auxiliary contact mechanism and the lever of the second auxiliary contact mechanism to move simultaneously. When the dynamic contact mechanism moves to one side, the lever of one of the second auxiliary contact mechanism and the auxiliary contact mechanism can push its corresponding movable spring to separate from the static spring, and at the same time, the lever of the other one moves away from its corresponding movable spring, so that the movable spring contacts the static spring.

[0013] Preferably, one end of the middle spring is connected to one end of the holding coil, the other end of the middle spring cooperates with one end of the upper spring and the lower spring, the other end of the lower spring is connected to the other end of the holding coil of the electromagnetic system, and the other end of the upper spring is connected to the indication circuit of the circuit module.

[0014] Preferably, the electromagnetic system includes a coil frame and a starting coil wound on the outside of the coil frame. The coil frame is provided with an auxiliary installation mechanism for installing the auxiliary contact system. The auxiliary installation mechanism includes a socket and multiple connecting plates. The socket is provided with a slot for the limiting circuit module. The multiple connecting plates are respectively connected between the circuit module and the electromagnetic system.

[0015] Preferably, it further includes a housing assembly. The housing assembly includes a magnetic conductive plate disposed between the electromagnetic system and the moving contact mechanism. The moving contact mechanism is provided with a moving iron core extending through the magnetic conductive plate to the inside of the coil bobbin. The magnetic conductive plate is provided with an auxiliary installation notch for avoiding the auxiliary installation mechanism.

[0016] Preferably, the coil bobbin includes two oppositely arranged upper side plates and lower side plates, and a coil cylinder connected between the upper side plates and the lower side plates. An activation coil and a holding coil are wound outside the coil cylinder between the upper side plates and the lower side plates. The socket includes two oppositely arranged mounting bars, and the two mounting bars are respectively perpendicularly connected to the upper side plates. The circuit module is installed between the two mounting bars. Slots are respectively provided on the inner sides of the two mounting bars, and the side edges on both sides of the circuit module are respectively limited by the slots on both sides.

[0017] Preferably, a connection seat for installing a connecting piece is provided at the edge of the upper side plate. The middle of the connecting piece passes through the connection seat and is perpendicularly arranged with respect to the upper side plate. One end of the connecting piece extends to one side of the circuit module, and the other end of the connecting piece extends to the outside of the activation coil.

[0018] The auxiliary contact system of the DC relay of the present invention indicates the working state of the moving contact mechanism through the cooperation of the reed and the lever. It not only has a simple structure, low cost, and simple assembly, but also directly cooperates with the moving contact mechanism, with high sensitivity and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is an exploded view of Embodiment 1 of the contact system of the embodiment of the present invention;

[0020] Figure 2 is a cross-sectional view of Embodiment 1 of the contact system of the embodiment of the present invention;

[0021] Figure 3 is a schematic structural view of Embodiment 1 of the contact system of the embodiment of the present invention;

[0022] Figure 4 is a cross-sectional view of Embodiment 1 of the upper insulating sleeve of the embodiment of the present invention;

[0023] Figure 5 is a schematic structural view of Embodiment 1 of the upper insulating sleeve of the embodiment of the present invention;

[0024] Figure 6 is a cross-sectional view of Embodiment Figure 5 of the present invention;

[0025] Figure 7 is a cross-sectional view of Embodiment 2 of the upper insulating sleeve of the embodiment of the present invention;

[0026] Figure 8It is a schematic structural diagram of the second embodiment of the upper insulating sleeve in the embodiments of the present invention;

[0027] Figure 9 It is an embodiment of the present invention Figure 8 Cross-sectional view;

[0028] Figure 10 It is an exploded view of the second embodiment of the contact system in the embodiments of the present invention;

[0029] Figure 11 It is a cross-sectional view of the first embodiment of the contact system in the embodiments of the present invention;

[0030] Figure 12 It is a schematic structural diagram of the second embodiment of the contact system in the embodiments of the present invention;

[0031] Figure 13 It is a side view of the first embodiment of the auxiliary contact system in the embodiments of the present invention;

[0032] Figure 14 It is a schematic structural diagram of the first embodiment of the auxiliary contact system in the embodiments of the present invention;

[0033] Figure 15 It is another side view of the first embodiment of the auxiliary contact system in the embodiments of the present invention;

[0034] Figure 16 It is another schematic structural diagram of the second embodiment of the auxiliary contact system in the embodiments of the present invention;

[0035] Figure 17 It is a schematic diagram of the cooperation between the static reed and the moving reed in the embodiments of the present invention;

[0036] Figure 18 It is a side view of the second embodiment of the auxiliary contact system in the embodiments of the present invention;

[0037] Figure 19 It is a schematic structural diagram of the second embodiment of the auxiliary contact system in the embodiments of the present invention;

[0038] Figure 20 It is another side view of the second embodiment of the auxiliary contact system in the embodiments of the present invention;

[0039] Figure 21 It is another schematic structural diagram of the second embodiment of the auxiliary contact system in the embodiments of the present invention;

[0040] Figure 22 It is a schematic diagram of the cooperation between the upper reed, the lower reed and the middle reed in the embodiments of the present invention;

[0041] Figure 23 It is a cross-sectional view of the electromagnetic system in the embodiments of the present invention;

[0042] Figure 24It is a schematic diagram of the cooperation between the static reed and the moving reed and the electromagnetic system in the embodiment of the present invention;

[0043] Figure 25 It is a cooperation diagram of the upper reed, the lower reed and the middle reed and the electromagnetic system in the embodiment of the present invention;

[0044] Figure 26 It is a schematic structural diagram of the coil skeleton in the embodiment of the present invention;

[0045] Figure 27 It is a cross-sectional view of the cooperation between the arc extinguishing mechanism and the auxiliary contact system in the embodiment of the present invention;

[0046] Figure 28 It is a schematic diagram of the cooperation between the arc extinguishing mechanism and the auxiliary contact system in the embodiment of the present invention;

[0047] Figure 29 It is a side schematic diagram of the arc extinguishing mechanism cutting the arc in the embodiment of the present invention;

[0048] Figure 30 It is a top-side schematic diagram of the arc extinguishing mechanism cutting the arc in the embodiment of the present invention;

[0049] Figure 31 It is a schematic structural diagram of the arc extinguishing mechanism in the embodiment of the present invention;

[0050] Figure 32 It is a top view of the arc extinguishing mechanism in the embodiment of the present invention;

[0051] Figure 33 It is a left view of the arc extinguishing mechanism in the embodiment of the present invention;

[0052] Figure 34 It is a front view of the arc extinguishing mechanism in the embodiment of the present invention;

[0053] Figure 35 It is the third embodiment of the first controllable element in the embodiment of the present invention;

[0054] Figure 36 It is the first embodiment of the first controllable element in the embodiment of the present invention;

[0055] Figure 37 It is the second embodiment of the first controllable element in the embodiment of the present invention;

[0056] Figure 38 It is the embodiment of the present invention Figure 35 of the circuit schematic diagram;

[0057] Figure 39 It is a voltage change diagram when the first control circuit and the electromagnetic system cooperate in the embodiment of the present invention;

[0058] It is a current change diagram when the first control circuit and the electromagnetic system cooperate in the embodiment of the present invention;

[0059] Figure 40 It is a schematic diagram of the second control circuit according to an embodiment of the present invention;

[0060] Figure 41 It is a circuit schematic diagram of the second control circuit according to an embodiment of the present invention;

[0061] Figure 42 It is a voltage change diagram when the second control circuit according to an embodiment of the present invention cooperates with an electromagnetic system;

[0062] Figure 43 It is a schematic diagram of the structure of the housing according to an embodiment of the present invention;

[0063] Figure 44 It is a partial cross-sectional view of the housing according to an embodiment of the present invention. Detailed implementation manners

[0064] The following combines the Figure 45 Given embodiments to further illustrate the specific implementation manners of the auxiliary contact system of the DC relay of the present invention. The auxiliary contact system of the DC relay of the present invention is not limited to the descriptions of the following embodiments.

[0065] As Figures 1 to 45 [[ID=ģ1]]Shown, the DC relay of the present invention includes a housing assembly, and a contact system, an electromagnetic system 3 and a circuit module 5 provided in the housing assembly. The contact system includes a static contact mechanism 11 and a moving contact mechanism 12 arranged oppositely. The static contact mechanism 11 includes two static contact heads 110. The moving contact mechanism 12 includes a moving contact bridge 120 cooperating with the two static contact heads 110. The two static contact heads 110 are respectively connected to the main circuit. The electromagnetic system 3 can drive the moving contact bridge 120 to contact with the two static contact heads 110, so that the moving contact bridge 120 forms a conduction path for the main circuit between the two static contact heads 110. The DC relay of the present invention is applicable to high voltages with a rated operating voltage of 450VDC - 750VDC, and can be further increased to a rated operating voltage of 950VDC.

[0066] One improvement point of the present invention is that an insulating mechanism is provided in the contact system to strengthen the insulation of the contact system through the insulating mechanism. The insulating mechanism can prevent the moving contact mechanism 12 from breaking down with the electromagnetic system 3.

[0067] Another improvement point of the present invention is that a blocking mechanism is provided in the contact system. When the current direction is misconnected, the blocking mechanism can prevent the arc from concentrating and stretching towards the middle, reducing the risk of breakdown.

[0068] Another improvement point of the present invention is that a sealing mechanism 157 is provided in the contact system. The sealing mechanism 157 can not only improve the sealing performance of the contact system, but also reduce the leakage problem of weld cracking caused by inconsistent expansion coefficients when the temperature changes.

[0069] Another improvement of the present invention lies in that it further includes an auxiliary contact system cooperating with the contact system. A lever cooperating with the auxiliary contact system is provided on the insulating mechanism. When the contact system operates, the auxiliary contact system is driven to operate together through the lever, which has the characteristics of simple structure and small size.

[0070] Another improvement of the present invention lies in changing the voltage of the electromagnetic system 3 when it is powered on and when it continues to be powered on after being powered on. When the electromagnetic system 3 is powered on, the working power is increased so that the moving contact bridge 120 contacts the static contact 110 faster; after the electromagnetic system 3 is powered on, the working voltage is reduced to reduce the power consumption.

[0071] Figures 1 - 2 Embodiment 1 of the contact system is shown. Figures 1 - 9 Embodiment 2 of the contact system is shown. The main difference between the two embodiments lies in the different structures of the contact system, but the static contact mechanisms 11 of the contact systems in both embodiments include a ceramic seat 111 for fixing the static contact 110.

[0072] Such as Figures 10 - 12 Embodiment 1 of the contact system is shown. The ceramic seat 111 has a semi-box-shaped structure and is buckled above the moving contact mechanism 12.

[0073] Such as Figures 1 - 3 Embodiment 2 of the contact system is shown. The ceramic seat 111 has a flat plate-shaped structure and is arranged inside the opening edge of the inner shell 141 of the housing assembly. The sealing mechanism 157 is arranged between the periphery of the ceramic seat 111 and the inner wall of the inner shell 141, and a sealed space is formed between the ceramic seat 111 and the inner shell 141 through the sealing mechanism 157.

[0074] Such as Figures 10 - 12 Embodiment of the insulating mechanism is shown. The structures of the insulating mechanisms in the two embodiments of the contact system are the same. The moving contact mechanism 12 includes a main shaft 121 and a moving contact bridge 120. One end of the main shaft 121 cooperates with the electromagnetic system 3, and the other end of the main shaft 121 cooperates with the moving contact bridge 120. A main shaft hole sleeved outside the main shaft 121 is provided in the middle of the moving contact bridge 120. The electromagnetic system 3 can drive the main shaft 121 to drive the moving contact bridge 120 to contact or separate from the static contact 110.

[0075] The insulating mechanism includes a middle insulating sleeve 131 with a hollow structure, and an upper insulating sleeve 132 and a lower insulating sleeve 133 respectively arranged at both ends of the middle insulating sleeve 131. The middle insulating sleeve 131 is arranged between the outside of the main shaft 121 and the inside of the main shaft hole of the moving contact bridge 120. The lower insulating sleeve 133 is located on the side of the moving contact bridge 120 away from the static contact 110, and the lower insulating sleeve 133 is connected to the middle insulating sleeve 131. An overtravel spring 134 is arranged outside the middle insulating sleeve 131 and is connected between the lower insulating sleeve 133 and the moving contact bridge 120. The upper insulating sleeve 132 is located on the side of the moving contact bridge 120 close to the static contact 110, and the upper insulating sleeve 132 is connected to the main shaft 121 by threads or other connections;

[0076] When the moving contact bridge 120 is separated from the static contact 110, the overtravel spring 134 pushes the moving contact bridge 120 to be limited by the upper insulating sleeve 132;

[0077] When the moving contact bridge 120 contacts the static contact 110, the static contact 110 pushes the moving contact bridge 120 to separate from the upper insulating sleeve 132 and compress the overtravel spring 134.

[0078] The contact system of the high-voltage DC relay of the present invention, through the middle insulating sleeve 131, not only forms an effective insulating effect between the moving contact bridge 120 and the main shaft 121 inside the main shaft hole, preventing electric breakdown between the moving contact bridge 120 and the main shaft 121, but also the upper insulating sleeve 132 can not only improve the insulating effect, but also cooperate with the overtravel spring 134 to limit the moving contact bridge 120, having the characteristics of simple structure, few parts, low cost and convenient assembly. In addition, when the moving contact bridge 120 contacts the static contact 110, the static contact 110 pushes the moving contact bridge 120 to separate from the upper insulating sleeve 132 and compress the overtravel spring 134, further increasing the electrical distance between the main shaft 121 and the moving contact bridge 120, with higher reliability.

[0079] Further, the middle insulating sleeve 131 and the lower insulating sleeve 133 are integrally formed into a T-shaped structure. The end of the middle insulating sleeve 131 away from the lower insulating sleeve 133 is arranged higher than the moving contact bridge 120. The upper insulating sleeve 132 is in a ring structure and is sleeved outside the end of the middle insulating sleeve 131 that is higher than the moving contact bridge 120. An upper insulating groove 135 is provided at the top side edge of the inner ring of the upper insulating sleeve 132, and a retaining ring 136 in a ring structure is arranged in the upper insulating groove 135. The inner side of the retaining ring 136 is connected to the main shaft 121. Of course, the middle insulating sleeve 131 can also be integrally formed with the upper insulating sleeve 132 in reverse, and the lower insulating sleeve 133 is connected to the middle insulating sleeve 131 through the retaining ring 136, which all belong to the protection scope of the present invention.

[0080] Further, the lower insulating sleeve 133 is provided with an annular lower insulating sinking groove 137 on the side close to the moving contact bridge 120. The overtravel spring 134 is sleeved on the middle insulating sleeve 131. The end of the overtravel spring 134 away from the moving contact bridge 120 extends into the lower insulating sinking groove 137 for limiting and mating. The lower insulating sinking groove 137 can facilitate the positioning of the overtravel spring 134, reduce the assembly difficulty, and prevent the overtravel spring 134 from skewing during operation.

[0081] Specifically, the main shaft 121 includes a middle shaft portion 121b passing through the magnetic conduction plate 140 and upper and lower shaft portions 121a and 121c respectively provided at both ends of the middle shaft portion 121b. The upper shaft portion 121a is connected to the moving contact bridge 120 through an insulating mechanism. The lower shaft portion 121c extends to the inside of the electromagnetic system 3, and a moving iron core 123 is provided on the lower shaft portion 121c. The moving iron core 123 is connected to the magnetic conduction plate 140 through a return spring 127. The electromagnetic system 3 can drive the moving iron core 123 to drive the main shaft 121 to act, and the return spring 127 drives the main shaft 121 to reset after the action.

[0082] Further, the middle insulating sleeve 131 is sleeved on the outside of the upper shaft portion 121a. The outer diameter of the upper shaft portion 121a is smaller than that of the middle shaft portion 121b. An upper step 129 for limiting and mating with the lower insulating sleeve 133 is formed at the connection between the upper shaft portion 121a and the middle shaft portion 121b. A card slot 124 for limiting and mating with the retaining ring 136 is provided on the circumferential surface of the upper shaft portion 121a at the end away from the middle shaft portion 121b.

[0083] Preferably, the edge of the upper step 129 extends radially outward along the lower insulating sleeve 133, and the limiting effect is more reliable.

[0084] Preferably, a washer is provided between the upper step 129 and the lower insulating sleeve 133 to further improve the limiting effect.

[0085] Further, the outer diameter of the lower shaft portion 121c is smaller than that of the middle shaft portion 121b. A lower step 125 for limiting the moving iron core 123 is formed at the connection between the lower shaft portion 121c and the middle shaft portion 121b. A core limiting member 128 for limiting the moving iron core 123 is provided at the end of the lower shaft portion 121c away from the middle shaft portion 121b. The moving iron core 123 is in a cylindrical structure and is sleeved on the outside of the lower shaft portion 121c and the middle shaft portion 121b. An iron core sinking groove 126 surrounding the middle shaft portion 121b is provided on the inner wall of the moving iron core 123 at the end close to the magnetic conduction plate 140. The bottom wall of the iron core sinking groove 126 is in limiting and mating with the lower step 125. The end face of the moving iron core 123 away from the magnetic conduction plate 140 is in limiting and mating with the core limiting member 128. The return spring 127 is arranged between the side wall of the iron core sinking groove 126 and the middle shaft portion 121b. One end of the return spring 127 abuts against the bottom wall of the iron core sinking groove 126, and the other end of the return spring 127 abuts against the side face at the bottom of the magnetic conduction plate 140.

[0086] Figures 4 - 6 Example 1 of the upper insulating sleeve 132 is shown. Figures 4 - 6 Example 2 of the upper insulating sleeve 132 is shown. Both of the two examples of the upper insulating sleeve 132 have the following characteristics:

[0087] The upper insulating sleeve 132 includes an insulating middle plate 1321 that mates with the middle part of the moving contact bridge 120 and insulating side plates 1322 respectively arranged on both sides of the insulating middle plate 1321. A blocking mechanism is provided on the side of the insulating side plate 1322 close to the static contact 110.

[0088] For the contact system of the high-voltage DC relay of the present invention, when the current direction is misconnected, the upper insulating sleeve 132 can avoid the arc from concentrating and stretching towards the middle through the insulating side plate 1322 and the blocking mechanism on the insulating side plate 1322, effectively reducing the risk of breakdown.

[0089] The insulating side plate 1322 can be provided only on one side of the insulating middle plate 1321, or can be provided on both sides. In this embodiment, preferably two insulating side plates 1322 are included. The two insulating side plates 1322 are oppositely arranged on both sides of the insulating middle plate 1321 and extend towards both ends of the moving contact bridge 120 along the length direction of the moving contact bridge 120. Blocking mechanisms are respectively provided on the top sides of the two insulating side plates 1322. Setting the insulating side plates 1322 on both sides to cover the surface of the moving contact bridge 120 can improve the insulation effect. Of course, providing the insulating side plate 1322 only on one side of the insulating middle plate 1321 also falls within the protection scope of the present invention.

[0090] Furthermore, the upper insulating sleeve 132 further includes insulating side ears 1323 extending towards the side away from the static contact 110. At least two insulating side ears 1323 are provided on each insulating side plate 1322, and the at least two insulating side ears 1323 are oppositely arranged on both sides of the moving contact bridge 120 along the width direction of the moving contact bridge 120 and are higher than the moving contact bridge 120. The insulating side ears 1323 can increase the shielding area of the upper insulating sleeve 132, improve the insulation protection effect, and even when the static contact 110 pushes the moving contact bridge 120 to separate from the upper insulating sleeve 132 during the over-travel, the insulating side ears 1323 can still play a good insulation protection role.

[0091] Further, the widths of the two insulating side plates 1322 gradually increase in the direction close to the end of the moving contact bridge 120. Insulating sides inclined to the length direction of the moving contact bridge 120 are provided on both sides in the width direction of the two insulating side plates 1322. One ends of the two insulating sides on both sides of each insulating side plate 1322 are connected to the insulating middle plate 1321, and the other ends of the two insulating sides on both sides of each insulating side plate 1322 are respectively connected to the sides of the insulating side ears 1323. By gradually increasing the width of the insulating side plates 1322, a better insulation effect can be obtained.

[0092] Further, an insulating ring 1324 surrounding the top of the main shaft 121 is provided on the top side of the insulating middle plate 1321. Since the top of the main shaft 121 is higher than the top side surface of the insulating middle plate 1321, and an upper insulating sink 135 is provided in the middle of the upper insulating sleeve 132, a retaining ring 136 in a ring structure is provided in the upper insulating sink 135, and the inner side of the retaining ring 136 is connected to the main shaft 121. The insulating ring 1324 can not only improve the insulation effect between the upper insulating sleeve 132 and the main shaft 121, but also enhance the structural strength of the upper insulating sleeve 132.

[0093] The differences between the two embodiments of the upper insulating sleeve 132 lie in the different structures of the blocking mechanism:

[0094] As Figures 7 - 9 shown in Embodiment 1 of the upper insulating sleeve 132, the blocking mechanism of this embodiment includes a plurality of insulating cross ribs 1325 provided on the top side of the insulating side plates 1322, and the length directions of the plurality of insulating cross ribs 1325 are all perpendicular to the length direction of the moving contact bridge 120. Preferably, three parallel and spaced insulating cross ribs 1325 are respectively provided on the top side of each insulating side plate 1322.

[0095] As Figures 4 - 6 shown in Embodiment 2 of the upper insulating sleeve 132, the blocking mechanism of this embodiment includes an insulating baffle 1326 vertically provided on the top side of the insulating side plates 1322. The height of the insulating baffle 1326 is higher than that of the insulating cross ribs 1325, which can achieve a more reliable insulation effect.

[0096] Further, a plurality of insulating longitudinal ribs 1327 are provided on the side surface of the insulating baffle 1326 on the side away from the insulating middle plate 1321. When insulating baffles 1326 are provided on both insulating side plates 1322, that is, a plurality of insulating longitudinal ribs 1327 are respectively provided on the side surfaces of the two insulating baffles 1326 facing away from each other. The insulating longitudinal ribs 1327 can further improve the insulation effect of the insulating baffle 1326, and when the arc stretches towards the middle, cut and disperse the arc to achieve the purpose of quickly extinguishing the arc.

[0097] Further, the length of the insulating baffle 1326 in the width direction of the moving contact bridge 120 is greater than that of the insulating side plate 1322, and insulating earpieces 1328 extending downward to both sides of the moving contact bridge 120 are provided at both ends of the insulating baffle 1326, and the two insulating earpieces 1328 at both ends of each insulating baffle 1326 are respectively connected to the outer sides of the two insulating side ears 1323 of the insulating side plate 1322.

[0098] Further, reinforcing ribs 1329 are respectively provided on the top sides of the two insulating side plates 1322, one ends of the two reinforcing ribs 1329 are respectively connected to the bottoms of the side faces of the two insulating baffles 1326 close to each other, and the other ends of the two reinforcing ribs 1329 are respectively connected to both sides of the insulating ring 1324 of the insulating middle plate 1321.

[0099] As Figures 7 - 8 shown, one ends of the two static contacts 110 respectively pass through the ceramic seat 111 and are respectively matched with both ends of the moving contact bridge 120. An insulating partition 1111 is provided on the side of the ceramic seat 111 close to the moving contact bridge 120, and the insulating partition 1111 is located between the two static contacts 110.

[0100] The number of the insulating partitions 1111 can be one or more. This embodiment includes two oppositely arranged insulating partitions 1111, and the two insulating partitions 1111 are both arranged perpendicular to the length direction of the moving contact bridge 120.

[0101] As Figure 4 shown, the two insulating partitions 1111 cooperate with the second embodiment of the upper insulating sleeve 132 described above. The blocking mechanism includes insulating baffles 1326 respectively vertically arranged on the top sides of the two insulating side plates 1322, and the bottom parts of the two insulating partitions 1111 respectively extend to the inner sides of the two insulating baffles 1326. The combination of the insulating partitions 1111 and the insulating baffles 1326 in the longitudinal direction can further improve the insulation effect and prevent the arc from extending to the middle part and breaking through when the circuit is connected reversely.

[0102] Figure 7 The first embodiment of the sealing mechanism 157 is shown, Figures 3 - 4 The second embodiment of the sealing mechanism 157 is shown. The two embodiments of the sealing mechanism 157 have different structures. The first embodiment of the sealing mechanism 157 corresponds to the first embodiment of the contact system, and the second embodiment of the sealing mechanism 157 corresponds to the second embodiment of the contact system. However, the two embodiments of the sealing mechanism 157 have the following characteristics:

[0103] The ceramic seat 111 is connected to the housing assembly through the sealing mechanism 157. One side of the sealing mechanism 157 is welded to the ceramic seat 111, and the other side of the sealing mechanism 157 is welded to the housing assembly.

[0104] The contact system of the high-voltage DC relay of the present invention has high sealing performance and high reliability by welding both sides of the sealing mechanism 157 to the ceramic base 111 and the housing assembly respectively.

[0105] Furthermore, between the side surface of the first seal 151 and the ceramic base 111, and between the side surface of the second seal 152 and the housing assembly, insulating fillers surrounding the welding joints are provided respectively.

[0106] The malleable insulating filler can be filled around the welding joints on the sides of the first seal 151 and the second seal 152, which not only increases the contact area between the sealing mechanism 157 and the sealed parts, but also improves the sealing performance at the weak connection points. The welding can be various welding methods. In this embodiment, laser welding, brazing or soldering is preferably used. The insulating filler is not specifically limited either. In this embodiment, resin is preferably used.

[0107] Furthermore, the sealing mechanism 157 includes a first seal 151 and a second seal 152 arranged at intervals, and an intermediate seal 153 connected between the first seal 151 and the second seal 152. The first seal 151, the second seal 152 and the intermediate seal 153 are integrally formed of kovar alloy material.

[0108] The contact system of the high-voltage DC relay of the present invention not only has a larger structural deflection, reduces the dimensional change under thermal cycling, and alleviates the cracking phenomenon by welding the first seal 151 and the second seal 152 of the sealing mechanism 157 to the parts respectively and connecting the intermediate seal 153 between the first seal 151 and the second seal 152. Moreover, the sealing mechanism 157 integrally formed of kovar alloy material can avoid the problems of weld cracking and leakage caused by inconsistent expansion coefficients after thermal cycling.

[0109] Figures 10 - 12 The structure of the housing assembly in the first embodiment of the contact system is shown. Figure 1 The structure of the housing assembly in the second embodiment of the contact system is shown. The structures of the housing assemblies in the two embodiments of the contact system are basically the same and both have the following characteristics:

[0110] The housing assembly includes an outer housing assembly and an inner housing assembly disposed inside the outer housing assembly. The electromagnetic system 3, the moving contact mechanism 12, the stationary contact mechanism 11, and the circuit module 5 are sequentially disposed inside the inner housing assembly. The outer housing assembly includes an outer housing 143 and an outer cover 144. The inner housing assembly includes an inner housing 141 and an inner cover 142, and a magnetic conductive plate 140 disposed inside the inner housing 141. The magnetic conductive plate 140 is disposed between the electromagnetic system 3 and the moving contact bridge 120. The side surface of the second seal 152 is welded to the inner housing 141 or the magnetic conductive plate 140. The outer housing 143 is a barrel-shaped housing made of plastic. An installation hole is provided at the lower part of the outer housing 143, and a metal sleeve 145 for enhancing the structural strength is embedded in the installation hole (see Figure 10 )

[0111] As Figures 44 - 45 Shown in the first embodiment of the sealing mechanism 157, corresponding to the first embodiment of the contact system. In the first embodiment of the contact system, the ceramic seat 111 is a semi-box-shaped structure. The ceramic seat 111 is buckled above the moving contact bridge 120 of the moving contact mechanism 12. The sealing mechanism 157 is disposed between the ceramic seat 111 and the magnetic conductive plate 140 of the housing assembly, forming a sealed space between the ceramic seat 111 and the magnetic conductive plate 140. The electromagnetic system 3 is disposed below this sealed space, and there is no arc extinguishing mechanism in this embodiment.

[0112] Both the first seal 151 and the second seal 152 of the sealing mechanism 157 are in a flat annular structure, and the intermediate seal 153 is in a cylindrical structure. The edge of the inner ring of the first seal 151 is sleeved around the main shaft 121 of the moving contact mechanism 12. One side of the outer ring edge of the first seal 151 is connected to the second seal 152 through the intermediate seal 153, and the other side of the outer ring edge of the first seal 151 is welded to the ceramic seat 111.

[0113] Further, the cross-section of one side of the sealing mechanism 157 is in a "Z" shape. The second seal 152 is disposed parallel to one side of the first seal 151, and the radius of the inner ring of the second seal 152 is greater than the radius of the outer ring of the first seal 151. The intermediate seal 153 is disposed between the second seal 152 and the first seal 151. One end of the intermediate seal 153 is connected to the inner ring edge of the second seal 152, and the other end of the intermediate seal 153 is connected to the outer ring edge of the first seal 151. Of course, the cross-section of the intermediate seal 153 on one side of the sealing mechanism 157 can also be in an "I" shape structure, that is, both ends of the intermediate seal 153 are connected to the side surfaces of the first seal 151 and the second seal 152, which are all within the protection scope of the present invention.

[0114] Further, the inner ring edge of the first seal 151 is located above the lower insulating sleeve 133.

[0115] As Figures 3 - 4An embodiment two of the sealing mechanism 157 is shown, corresponding to embodiment two of the contact system. In embodiment two of the contact system, the ceramic seat 111 is of a flat plate structure. The sealing mechanism 157 is arranged between the periphery of the ceramic seat 111 and the inner wall of the inner shell 141. A sealed space is formed between the ceramic seat 111 and the inner shell 141 through the sealing mechanism 157. The difference between embodiment two of the contact system and embodiment one is that the ceramic seat 111, the moving contact mechanism 12, and the electromagnetic system 3 are all arranged inside the inner shell 141 of the housing assembly, and an arc extinguishing mechanism for extinguishing an arc is provided in the inner shell 141.

[0116] The first seal 151 and the second seal 152 of the sealing mechanism 157 are both of a cylindrical structure. The first seal 151 is coaxially arranged inside the inner ring of the second seal 152. The intermediate seal 153 is of an annular structure and is connected between the first seal 151 and the second seal 152. The inner side wall of the first seal 151 is welded to the ceramic seat 111, and the outer side wall of the second seal 152 is welded to the edge of the opening of the inner shell 141.

[0117] Furthermore, an insulating filler is provided between the first seal 151 and the second seal 152.

[0118] Furthermore, it further includes a third seal 154 of an annular structure. The inner ring edge of the third seal 154 is connected to the top end of the second seal 152 to form an "L" - shaped structure and is sleeved on the opening edge of the inner shell 141. The second seal 152 is welded to the inner side wall of the opening edge of the inner shell 141, and / or the third seal 154 is welded to the top end face of the opening edge of the inner shell 141.

[0119] That is, the third seal 154 can replace the second seal 152 to be welded to the inner shell 141, without welding the second seal 152 to the inner wall of the inner shell 141, which can reduce the difficulty of welding. Of course, the second seal 152 and the third seal 154 can also both be welded to the inner shell 141, or the third seal 154 is not provided, and only the second seal 152 is welded to the inner shell 141. In addition, the sealing mechanism 157 can effectively improve the sealing performance by the "L" - shaped structure and sleeving on the opening edge of the inner shell 141.

[0120] Further, the cross-section of one side of the sealing mechanism 157 is in a "U" - shaped structure. At this time, the insulating filler between the first seal 151 and the second seal 152 is located above the intermediate seal 153. The intermediate seal 153 is connected between the bottom ends of the first seal 151 and the second seal 152. Preferably, the top end of the second seal 152 is set higher than the top end of the first seal 151. An annular outer limiting sunk groove 155 is provided at the top of the inner wall of the inner shell 141, and an annular inner limiting sunk groove 156 is provided at the bottom of the outer wall of the ceramic base 111. Both the cross-sections of the outer limiting sunk groove 155 and the inner limiting sunk groove 156 are in an L - shaped structure. The outer limiting sunk groove 155 is used to accommodate the second seal 152, and the bottom wall of the outer limiting sunk groove 155 is in limit fit with the apex angle at the connection between the second seal 152 and the intermediate seal 153. The top wall of the inner limiting sunk groove 156 is in limit fit with the end face at the top of the first seal 151, and the side wall of the inner limiting sunk groove 156 is welded to the ring wall of the inner ring of the first seal 151. By the cooperation of the outer limiting sunk groove 155 and the inner limiting sunk groove 156 with the first seal 151 and the second seal 152 respectively, it can not only play a role in accommodation, making the structure of the circuit breaker compact, but also play a role in limiting, effectively reducing the difficulty during assembly and welding. Of course, the intermediate seal 153 can also be connected between the middle parts of the first seal 151 and the second seal 152, that is, the cross-section of one side of the sealing mechanism 157 is in a "I" - shaped structure. At this time, the insulating filler between the first seal 151 and the second seal 152 is located on both sides of the intermediate seal 153, which all belong to the protection scope of the present invention.

[0121] Further, as Figures 10 - 12 shown, the housing assembly further includes an inner cover 142 that cooperates with the top side of the ceramic base 111. An inner cover avoidance hole 1420 for avoiding the static contact 110 is provided on the inner cover 142. The third seal 154 is arranged between the top end face of the opening edge of the inner shell 141 and the inner cover 142.

[0122] As Figure 10 shown, the ceramic base 111 is preferably made of alumina ceramic. A plurality of through - holes for respectively installing the exhaust pipe 1113 and the control lead - out end 1112 are provided in the ceramic base 111. The exhaust pipe 1113 and the control lead - out end 1112 are respectively welded to the ceramic base 111.

[0123] During assembly, first, the electromagnetic system 3, the moving contact mechanism 12, the arc extinguishing mechanism, the circuit module 5 and the static contact mechanism 11 are installed into the inner shell 141. Then, the sealing mechanism 157 is laser - welded to the inner shell 141 and the ceramic base 111 respectively. Then, exhaust is carried out through the exhaust pipe 1113, hydrogen or a nitrogen - hydrogen mixed gas is flushed in, and then it is sealed. The inner cover 142 is installed on the inner shell 141 and they are together installed into the outer shell 143. Finally, insulating resin is poured into the outer shell 143 and cured.

[0124] As Figure 3 shown in the embodiment of the static contact 110, the present invention improves the sealing performance through the improvement of the structure of the static contact 110, and the structures of the static contacts 110 in the two embodiments of the contact system are the same.

[0125] A contact hole 112 for avoiding the static contact 110 is provided on the ceramic base 111. The static contact 110 has a cylindrical structure. The static contact 110 includes an intermediate column 113 provided on one side of the ceramic base 111, and contact columns 114 and connection columns 115 respectively arranged on both sides of the intermediate column 113 along the axial direction. The contact column 114 passes through the contact hole 112 and extends to the other side of the ceramic base 111. On one side of the intermediate column 113 close to the contact column 114, a cylindrical mounting cylinder 116 is provided. The mounting cylinder 116 surrounds the contact column 114, and the end of the mounting cylinder 116 far from the intermediate column 113 is welded to the ceramic base 111. An insulating filler is provided between the mounting cylinder 116 and the contact column 114 to fill the gap between the mounting cylinder 116 and the contact column 114.

[0126] Furthermore, an extension ring 117 is provided at one end of the mounting cylinder 116 far from the intermediate column 113. The side surface of the extension ring 117 is welded to the ceramic base 111, and the thickness of the extension ring 117 is greater than the thickness of the mounting cylinder 116. Through the extension ring 117, the thickness of one end of the mounting cylinder 116 far from the intermediate column 113 is increased, further increasing the contact area with the ceramic base 111, which is not only convenient for welding, but also the welding sealing effect is more reliable.

[0127] As Figures 3 - 4 shown, the high-voltage DC relay further includes an auxiliary contact system cooperating with the contact system. A shift lever cooperating with the auxiliary contact system is provided on the insulating mechanism. When the contact system operates, the auxiliary contact system is driven to operate together through the shift lever. The auxiliary contact system includes at least one auxiliary contact mechanism 6a provided on one side of the moving contact mechanism 12. Each auxiliary contact mechanism respectively includes a shift lever 61 and at least two cooperating reed pieces. The circuit module 5 is provided with an indication circuit connected to at least two reed pieces. One end of the shift lever 61 is connected to the moving contact mechanism 12, and the other end of the shift lever 61 cooperates with at least one reed piece. When the moving contact mechanism 12 operates, at least one reed piece is driven by the shift lever 61 to make the two reed pieces contact or separate, thereby conducting or disconnecting the indication circuit.

[0128] The auxiliary contact system of the high-voltage DC relay of the present invention indicates the working state of the moving contact mechanism 12 through the cooperation of the reed pieces and the shift lever 61. It not only has a simple structure, low cost, and simple assembly, but also directly cooperates with the moving contact mechanism 12, with high sensitivity and high reliability.

[0129] Furthermore, the auxiliary contact system includes two auxiliary contact mechanisms 6 a , and the two auxiliary contact mechanisms 6 a are arranged opposite to each other on both sides of the moving contact bridge 120 along the width direction of the moving contact bridge 120 .

[0130] Furthermore, the movable contact mechanism 12 includes a main shaft 121, a movable contact bridge 120, and an insulating mechanism. One end of the main shaft 121 engages with the electromagnetic system 3, and the other end of the main shaft 121 engages with the movable contact bridge 120. The electromagnetic system 3 can drive the main shaft 121 to bring the movable contact bridge 120 into contact with or separate from the static contact 110. The detent lever 61 is connected to the insulating mechanism. Of course, the detent lever 61 can also be connected to the main shaft 121 or the movable contact bridge 120, and both fall within the scope of protection of the present invention. However, connecting the detent lever 61 to the insulating mechanism not only simplifies the structure but also improves electrical safety and reliability.

[0131] Furthermore, the insulating mechanism includes a hollow middle insulating sleeve 131, and an upper insulating sleeve 132 and a lower insulating sleeve 133 respectively disposed at both ends of the middle insulating sleeve 131. The middle insulating sleeve 131 is disposed between the outer side of the main shaft 121 and the inner side of the main shaft hole of the movable contact bridge 120. The upper insulating sleeve 132 is located on the side of the movable contact bridge 120 close to the static contact 110. The detent rod 61 is connected to the upper insulating sleeve 132. Of course, the detent rod 61 can also be connected to the middle insulating sleeve 131 or the lower insulating sleeve 133 of the insulating mechanism.

[0132] like Figures 13 - 14 、 6 As shown in Figures 11 and 23, the electromagnetic system 3 includes a coil skeleton 31 and a starting coil 32 wound on the outside of the coil skeleton 31. A moving iron core 123 extending to the inside of the coil skeleton 31 and cooperating with the starting coil 32 is provided on the main shaft 121. When the starting coil 32 is energized, a magnetic field is formed to drive the moving iron core 123, and then the moving contact bridge 120 on the main shaft 121 is driven to contact or separate with the static contact 110 through the moving iron core 123.

[0133] Furthermore, a holding coil 33 connected in series with the starting coil 32 is provided on the outside of the coil skeleton 31. The holding coil 33 and the starting coil 32 are connected in series and then connected to the voltage stabilizing circuit. The resistance of the holding coil 33 is greater than the resistance of the starting coil 32, and the power of the holding coil 33 is less than the power of the starting coil 32. The two ends of the holding coil 33 are respectively connected to at least two reeds of the auxiliary contact mechanism 6a. When the electromagnetic system 3 is powered on, the starting coil 32 drives the moving contact mechanism 12 to drive the moving contact bridge 120 to move, and at the same time the holding coil 33 is short-circuited by the two reeds; after the electromagnetic system 3 is powered on, the lever 61 connected to the moving contact mechanism 12 separates the two reeds, connecting the starting coil 32 and the holding coil 33 in series.

[0134] Figure 2 and Figures 13 - 17 Two exemplary embodiments of the auxiliary contact means 6 a are shown in each case.

[0135] Refer to Figures 19 - 23 Figures 19 - 23 shows Embodiment 1 of the auxiliary contact mechanism 6a. The auxiliary contact mechanism 6a of this embodiment includes two reed pieces, namely a static reed piece 631 and a moving reed piece 632 that are respectively connected to the circuit module 5.

[0136] The length of the moving reed piece 632 is greater than that of the static reed piece 631. The end of the static reed piece 631 close to the lever 61 is spaced from the lever 61. The end of the moving reed piece 632 close to the lever 61 extends beyond the end of the static reed piece 631 and extends to one side of the lever 61 for cooperation. When the lever 61 moves, it pushes the part of the moving reed piece 632 that extends beyond the static reed piece 631, causing the moving reed piece 632 to contact or separate from the static reed piece 631.

[0137] In this embodiment, contacts are respectively provided on the static reed piece 631 and the moving reed piece 632. The static reed piece 631 and the moving reed piece 632 of this embodiment form a normally closed contact structure, that is, under normal conditions, the contacts of the static reed piece 631 and the moving reed piece 632 are in contact with each other, and the indication circuit remains conductive. When the moving contact mechanism 12 operates, the moving reed piece 632 is driven by the lever 61 to separate from the contact on the static reed piece 631, and the indication circuit is disconnected and a signal is output. Of course, the static reed piece 631 and the moving reed piece 632 can also be a normally open contact structure, remaining separated under normal conditions, and when the lever 61 operates, it drives the contacts on the static reed piece 631 and the moving reed piece 632 to contact each other. The auxiliary contact mechanism 6a of this embodiment has the characteristics of simple structure, low cost and reliable operation. In this embodiment, the auxiliary contact system includes two auxiliary contact mechanisms 6a, including two groups of static reed pieces 631 and moving reed pieces 632.

[0138] As Figures 13 - 16 Figures 13 - 16 shows the cooperation mode of the auxiliary contact system of this embodiment with the electromagnetic system 3, including two auxiliary contact mechanisms 6a. The two reed pieces of one auxiliary contact mechanism 6a are connected to the indication circuit of the circuit module 5 for indicating the working state. The other auxiliary contact mechanism 6a is the second auxiliary contact mechanism 6b, and the structure of the second auxiliary contact mechanism 6b is the same as that of the auxiliary contact mechanism 6a. The two reed pieces of the second auxiliary contact mechanism 6b are respectively connected to both ends of the holding coil 33 of the electromagnetic system 3 and are used to short-circuit the holding coil 33 when the electromagnetic system 3 is powered on.

[0139] The static reed piece 631 and the moving reed piece 632 of the second auxiliary contact mechanism 6b are respectively connected to both ends of the holding coil 33. When the start coil 32 is powered off, the moving reed piece 632 contacts the static reed piece 631 and shorts the holding coil 33. When the electromagnetic system 3 is powered on, the start coil 32 drives the main shaft 121 to drive the moving contact mechanism 12 to operate, and the moving contact mechanism 12 drives the lever 61 to push the moving reed piece 632 to move away from the static reed piece 631. After the electromagnetic system 3 is powered on, the moving reed piece 632 separates from the static reed piece 631.

[0140] As Figure 24 shown in the specific embodiment, the moving contact springs 632 of the second auxiliary contact mechanism 6b and the auxiliary contact mechanism 6a are respectively arranged on both sides of their respective operating rods 61 along the moving direction of the moving contact mechanism 12, forming a mechanical interlocking structure.

[0141] The operating rods 61 of the auxiliary contact mechanism 6a and the second auxiliary contact mechanism 6b are arranged at the same height, and the moving contact mechanism 12 can drive the operating rods 61 of the auxiliary contact mechanism 6a and the second auxiliary contact mechanism 6b to move simultaneously. The static contact spring 631 and the moving contact spring 632 of the auxiliary contact mechanism 6a are in contact with each other, and the static contact spring 631 and the moving contact spring 632 of the second auxiliary contact mechanism 6b are also in contact with each other. When the moving contact mechanism 12 moves to one side, it can cause the operating rod 61 of one of the second auxiliary contact mechanism 6b and the auxiliary contact mechanism 6a to push its corresponding moving contact spring 632 away from the static contact spring 631, and at the same time, the operating rod 61 of the other moves away from its corresponding moving contact spring 632, causing the moving contact spring 632 to contact the static contact spring 631.

[0142] Refer to Figures 13 - 16 the state when the starting coil 32 is powered off. The moving contact mechanism 12 drives the operating rods 61 of the auxiliary contact mechanism 6a and the second auxiliary contact mechanism 6b to move away from the static contact 110 under the drive of the return spring 127, causing the operating rod 61 of the auxiliary contact mechanism 6a to push the moving contact spring 632 of the auxiliary contact mechanism 6a away from the static contact spring 631 of the auxiliary contact mechanism 6a, disconnecting the indicating circuit. At the same time, the operating rod 61 of the second auxiliary contact mechanism 6b moves away from the moving contact spring 632 of the second auxiliary contact mechanism 6b, causing the moving contact spring 632 of the second auxiliary contact mechanism 6b to contact the static contact spring 631 of the second auxiliary contact mechanism 6b, short-circuiting the holding coil 33;

[0143] Refer to Figures 13 - 14 the state when the electromagnetic system 3 is powered on. The moving contact mechanism 12 drives the operating rods 61 of the auxiliary contact mechanism 6a and the second auxiliary contact mechanism 6b to move towards the static contact 110 under the drive of the starting coil 32, causing the operating rod 61 of the second auxiliary contact mechanism 6b to push the moving contact spring 632 of the second auxiliary contact mechanism 6b away from the static contact spring 631 of the second auxiliary contact mechanism 6b, connecting the holding coil 33 in series with the starting coil 32. At the same time, the operating rod 61 of the auxiliary contact mechanism 6a moves away from the moving contact spring 632 of the auxiliary contact mechanism 6a, causing the moving contact spring 632 of the auxiliary contact mechanism 6a to contact the static contact spring 631 of the auxiliary contact mechanism 6a, conducting the indicating circuit.

[0144] Figures 15 - 16Embodiment 2 of the auxiliary contact system is shown. The auxiliary contact mechanism 6a of this embodiment includes three reed pieces, namely an upper reed piece 641, a lower reed piece 642, and a middle reed piece 643, which are respectively connected to the circuit module 5.

[0145] The upper reed piece 641 and the lower reed piece 642 are arranged opposite to each other and are respectively located on both sides of one end of the middle reed piece 643. The other end of the middle reed piece 643 is connected to the circuit module 5. The middle part of the middle reed piece 643 is engaged with the lever 61. When the lever 61 moves, it pushes the middle part of the middle reed piece 643, causing the middle reed piece 643 to contact the upper reed piece 641 or the lower reed piece 642.

[0146] In this embodiment, contacts are respectively provided on both sides of the middle reed piece 643, and contacts are also respectively provided on the sides of the upper reed piece 641 and the lower reed piece 642 that are close to each other. The upper reed piece 641, the lower reed piece 642, and the middle reed piece 643 form a switching switch structure. Under normal conditions, the contact of the middle reed piece 643 contacts the contact of the lower reed piece 642, making the middle reed piece 643 and the lower reed piece 642 form a normally closed contact structure, and the middle reed piece 643 and the upper reed piece 641 form a normally open contact structure;

[0147] When the moving contact mechanism 12 drives the lever 61 to move, it pushes the middle reed piece 643 to move towards the upper reed piece 641. The contact on the middle reed piece 643 first separates from the contact on the lower reed piece 642, and then contacts the contact on the upper reed piece 641.

[0148] The auxiliary contact mechanism 6a of this embodiment not only has a more reliable structure, but also has higher sensitivity and more efficient feedback due to its "either - or" characteristic, and can meet more complex requirements for the working state indication of high - voltage DC relays.

[0149] As Figures 18 - 22 The cooperation mode of the auxiliary contact system of this embodiment and the electromagnetic system 3 is shown, including an auxiliary contact mechanism 6a. One end of the middle reed piece 643 is connected to one end of the holding coil 33. The other end of the middle reed piece 643 cooperates with one ends of the upper reed piece 641 and the lower reed piece 642. The other end of the lower reed piece 642 is connected to the other end of the holding coil 33 of the electromagnetic system 3. The other end of the upper reed piece 641 is connected to the indication circuit of the circuit module 5.

[0150] Refer to Figure 25 The state when the start coil 32 is powered off is shown. The moving contact mechanism 12 drives the lever 61 of the auxiliary contact mechanism 6a to move away from the static contact 110 under the drive of the return spring 127. The lever 61 of the auxiliary contact mechanism 6a pushes the middle reed piece 643 to move towards the lower reed piece 642, separating the middle reed piece 643 from the upper reed piece 641 and disconnecting the indication circuit. When the middle reed piece 643 contacts the lower reed piece 642, the holding coil 33 is short - circuited;

[0151] Refer to Figures 18 - 19Shows the state when the electromagnetic system 3 is powered on. The moving contact mechanism 12 drives the lever 61 of the auxiliary contact mechanism 6a to move towards the static contact 110 under the drive of the start coil 32. The middle spring piece 643 moves towards the upper spring piece 641. The lever 61 of the auxiliary contact mechanism 6a pushes the middle spring piece 643 to separate from the lower spring piece 642. The holding coil 33 is in series with the start coil 32. When the middle spring piece 643 contacts the upper spring piece 641, the indicating circuit is turned on.

[0152] As Figures 20 - 21 shown, an auxiliary mounting mechanism for mounting the auxiliary contact system is provided on the coil bobbin 31, and an auxiliary mounting notch 620 ( Figure 26 ) for avoiding the auxiliary mounting mechanism is provided on the magnetic conductive plate 140 of the housing assembly. The auxiliary mounting mechanism includes a socket 314 and a plurality of connecting pieces 317. A slot 316 for limiting the circuit module 5 is provided on the socket 314. The plurality of connecting pieces 317 are respectively connected between the circuit module 5 and the electromagnetic system 3.

[0153] Specifically, the coil bobbin 31 includes two relatively arranged upper side plates 311 and lower side plates 312, and a coil cylinder 313 connected between the upper side plates 311 and the lower side plates 312. A start coil 32 and a holding coil 33 wound outside the coil cylinder 313 are provided between the upper side plates 311 and the lower side plates 312. The socket 314 includes two relatively arranged mounting strips 3141, and the two mounting strips 3141 are respectively vertically connected to the upper side plate 311. The circuit module 5 is installed between the two mounting strips 3141. Slots 316 are respectively provided on the inner sides of the two mounting strips 3141, and the side edges on both sides of the circuit module 5 are respectively limited by the slots 316 on both sides.

[0154] Furthermore, a connection seat 315 for mounting the connecting piece 317 is provided at the edge of the upper side plate 311. The middle part of the connecting piece 317 passes through the connection seat 315 and is vertically arranged with respect to the upper side plate 311. One end of the connecting piece 317 extends to one side of the circuit module 5, and the other end of the connecting piece 317 extends to the outside of the start coil 32 and the holding coil 33.

[0155] Furthermore, three connecting pieces 317 are provided on the connection seat 315, and the three connecting pieces 317 are arranged in parallel. The two outermost connecting pieces 317 are respectively connected to the end of the start coil 32 and the start end of the holding coil 33, and the connecting piece 317 arranged in the middle is connected to the end of the start coil 32 and the start end of the holding coil 33.

[0156] As Figure 8As shown, the high-voltage DC relay of the present invention further includes an arc extinguishing mechanism. The arc extinguishing mechanism includes an arc extinguishing cover 71 surrounding the moving contact bridge 120, and two sets of magnetic field mechanisms respectively cooperating with both ends of the moving contact bridge 120. Each set of magnetic field mechanisms includes at least two magnetic field components 72 oppositely arranged on both sides of the moving contact bridge 120 along the width direction of the moving contact bridge 120, and the polarities of the magnetic field components 72 located on both sides of the moving contact bridge 120 in each set of magnetic field mechanisms are oppositely arranged, so that the magnetic field mechanism generates a constant magnetic field perpendicular to the current direction in the moving contact bridge 120. An auxiliary contact mechanism 6a is provided on at least one side of the middle of the moving contact bridge 120. The auxiliary contact mechanism 6a includes a lever 61 connected (indirectly connected) to the middle of the moving contact bridge 120 and at least two cooperating reed pieces, and at least two reed pieces are respectively connected to the circuit module 5. The circuit module 5 is arranged outside the arc extinguishing cover 71. Auxiliary chambers 630 for accommodating the reed pieces of the auxiliary contact mechanism 6a are respectively formed between both sides of the two sets of magnetic field mechanisms. A lever passage 610 for avoiding the lever 61 is provided in the middle of the side wall of the arc extinguishing cover 71, and the lever passage 610 is connected between the inner side of the arc extinguishing cover 71 and the auxiliary chamber 630.

[0157] The arc extinguishing mechanism of the high-voltage DC relay of the present invention can not only cooperate with the auxiliary contact mechanism 6a to reduce the volume with a compact structure, but also has the characteristic of strong arc extinguishing ability.

[0158] The arc extinguishing mechanism further includes a plurality of fixing mechanisms 73 respectively used for limiting the magnetic field components 72. The two fixing mechanisms 73 on the same side are arranged at intervals to form an auxiliary chamber 630. An arc extinguishing buckle 74 is provided on the side of the fixing mechanism 73 away from the arc extinguishing cover 71 (see Figures 27 - 29 ).

[0159] As Figure 31 , 28 , 31 shown, an auxiliary installation mechanism for installing the auxiliary contact mechanism 6a is provided on the coil bobbin 31 of the electromagnetic system 3. An auxiliary installation notch 620 for avoiding the auxiliary installation mechanism is provided on the magnetic conductive plate 140 of the housing assembly. The auxiliary installation mechanism includes a socket 314. A slot 316 for limiting the circuit module 5 is provided on the socket 314. An arc extinguishing slot 740 for limiting and cooperating with the arc extinguishing buckle 74 is provided on one side of the slot 316 close to the arc extinguishing cover 71. Of course, the arc extinguishing buckle 74 can also be connected to the housing assembly or the magnetic conductive plate 140.

[0160] As Figure 26 shown, the arc extinguishing mechanism includes two sets of magnetic field mechanisms oppositely arranged along the length direction of the moving contact bridge 120. Each set of magnetic field mechanisms includes two sets of magnetic field components 72 oppositely arranged along the width direction of the moving contact bridge 120. The arc extinguishing mechanism includes four fixing mechanisms 73 respectively used for fixing the magnetic field components 72.

[0161] The magnetic field assembly 72 includes a magnet 721 and a conductive magnet 722 arranged in parallel, the fixing mechanism 73 includes a side plate 731 and a short plate 733 arranged opposite to each other, and a horizontal plate 732 arranged vertically on one side of the side plate 731 and the short plate 733, one end of the side plate 731 and the short plate 733 are respectively connected to the arc extinguishing cover 71, the magnet 721 is limited between the short plate 733 and the side plate 731, the other end of the side plate 731 is connected to one end of the horizontal plate 732 to form an L-shaped structure, the other end of the short plate 733 is spaced apart from the horizontal plate 732 to form a clearance groove 734, the length of the conductive magnet 722 is greater than the magnet 721, the shell assembly includes an inner shell 141 surrounding the arc extinguishing cover 71, and the conductive magnet 722 is arranged on the side of the magnet 721 away from the arc extinguishing cover 71, one end of the conductive magnet 722 cooperates with the side plate 731, and the other end of the conductive magnet 722 passes through the clearance groove 734 and extends out of the fixing mechanism 73 to cooperate with the inner shell 141. The recess 734 allows the conductive magnet 722 to extend out of the fixing mechanism 73, which not only enables the magnet 721, the conductive magnet 722 and the inner shell 141 to form a magnetic circuit to generate a stronger magnetic field and extinguish the arc more quickly, but also has a simple structure and a small size.

[0162] Furthermore, the side plates 731 of the two fixing mechanisms 73 disposed on the same side of the arc extinguishing cover 71 are arranged opposite to each other, and an auxiliary chamber 630 for accommodating the spring of the auxiliary contact mechanism 6 a is formed between the side plates 731 of the two fixing mechanisms 73 .

[0163] Furthermore, the bottoms of the two fixing mechanisms 73 arranged on the same side of the arc extinguishing cover 71 are connected by a connecting plate 735, and the arc extinguishing buckle 74 includes an arc extinguishing clamping plate 741 and an arc extinguishing claw 742. The arc extinguishing clamping plate 741 has a U-shaped structure and the opening of the arc extinguishing clamping plate 741 is set toward the static contact 110. One side of the arc extinguishing clamping plate 741 is connected to the two fixing mechanisms 73 and the connecting plate 735 connected between the two fixing mechanisms 73, and the edge of the other side of the arc extinguishing clamping plate 741 extends outward to form an arc extinguishing claw 742.

[0164] Furthermore, the arc extinguishing cover 71 is provided with a plurality of arc extinguishing holes 75 on two side surfaces that are opposite to each other along the length direction of the moving contact bridge 120. The plurality of arc extinguishing holes 75 on the same side surface are arranged side by side at intervals along the height direction of the arc extinguishing cover 71, and an arc extinguishing grid 76 is formed between two adjacent arc extinguishing holes 75.

[0165] Furthermore, arc extinguishing slopes 77 are provided on both sides of the arc extinguishing grid 76, and the distance between two adjacent arc extinguishing grids 76 gradually increases in the direction away from the moving contact bridge 120, that is, the inner diameter of the arc extinguishing through hole 75 in the height direction gradually increases in the direction away from the moving contact bridge 120.

[0166] Furthermore, the included angle between the arc extinguishing inclined surfaces 77 of the two adjacent arc extinguishing grids 76 is in the range of 7 degrees to 17 degrees.

[0167] Furthermore, the arc extinguishing cover 71 is made of engineering plastics or ceramics with good insulation performance and strong arc resistance, such as BMC, PPS, alumina, etc. The magnet 721 is made of ferrite, neodymium iron boron or samarium cobalt, and the magnetic conductor 722 and the inner shell 141 are made of iron or iron alloy with good magnetic conductivity.

[0168] When the electromagnetic system 3 is powered on, the short-circuit holding coil 33 is short-circuited. After the electromagnetic system 3 is powered on, the short-circuit of the holding coil 33 is released, so that the starting coil 32 and the holding coil 33 are connected in series. The external control power supply input is processed, and after voltage reduction, it is stabilized at a certain value, which plays a role in reducing power consumption.

[0169] The electromagnetic system 3 includes a starting coil 32 and a holding coil 33 connected in series. After the starting coil 32 and the holding coil 33 are connected in series, they are connected to the power supply through a voltage stabilizing circuit. The resistance of the holding coil 33 is greater than that of the starting coil 32, and the power of the holding coil 33 is less than that of the starting coil 32. The first control circuit includes a first controllable element connected in parallel at both ends of the holding coil 33, and an RC delay circuit connected to the control end of the first controllable element. When the electromagnetic system 3 is powered on, the voltage changes rapidly. The RC delay circuit conducts the first controllable element, and the holding coil 33 is short-circuited through the first controllable element. When the holding coil 33 is short-circuited, the current passing through the starting coil 32 flows to the first controllable element, so that the starting coil 32 can work in a high-power state to drive the moving iron core to drive the main shaft 121 and the moving contact bridge 120 to act; after the electromagnetic system 3 is powered on, the voltage change is small, the RC delay circuit disconnects the first controllable element, and the current passing through the starting coil 32 flows to the holding coil 33, so that the holding coil 33 and the starting coil 32 are connected in series.

[0170] The control circuit of the high-voltage DC relay of the present invention adopts mechatronics technology. The short-circuit of the holding coil 33 is released through the delay of the first control circuit, so that the power switching of the electromagnetic system 3 does not require a mechanical structure for the main circuit to be linked. There is no need to encapsulate the circuit module 5 into the arc extinguishing mechanism, which ensures the purity of the arc extinguishing mechanism. At the same time, the structure is greatly simplified, ensuring the reliability of the product. In addition, even if the circuit module 5 is encapsulated into the arc extinguishing mechanism, due to its simple structure and good controllability, the assembly efficiency is also better than that of the mechanical linkage double-coil structure.

[0171] As Figures 31 - 32 shown, after the starting coil 32 and the holding coil 33 are connected in series, the overall resistance increases. Since the voltage remains unchanged and the current becomes smaller, the overall power becomes smaller, which has the characteristics of energy conservation, environmental protection and reducing component loss.

[0172] As Figures 39 - 40Example 1 of the first controllable element is shown. The first controllable element is intermediate relay A. Intermediate relay A includes a first moving contact and a first stationary contact connected in parallel across the holding coil 33. The coil of intermediate relay A is connected to the delay circuit. When the first moving contact touches the first stationary contact, the breaker holding coil 33 is held. When the coil of intermediate relay A is powered on, it drives the first moving contact to separate from the first stationary contact, causing the holding coil 33 to be connected in series with the starting coil 32.

[0173] When the electromagnetic system 3 is powered on, the delay circuit does not operate. The normally closed contact of intermediate relay A remains closed and shorts the holding coil 33. After the electromagnetic system 3 is powered on, the delay circuit drives intermediate relay A to operate, causing the normally closed contact of intermediate relay A to open, and connecting the starting coil 32 in series with the holding coil 33.

[0174] As Figure 36 Example 2 of the first controllable element is shown. The first controllable element is intermediate relay B. Intermediate relay B includes an intermediate moving contact, a normally closed stationary contact, and a normally open stationary contact. The intermediate moving contact is connected between one end of the holding coil 33 and one end of the starting coil 32. The normally closed stationary contact is connected to the other end of the holding coil 33. The normally open stationary contact is connected to the other end of the starting coil 32. The coil of intermediate relay B is connected to the delay circuit.

[0175] When the electromagnetic system 3 is powered on, the delay circuit does not operate. When the intermediate moving contact of intermediate relay B touches the normally closed stationary contact, the holding coil 33 is shorted. After the electromagnetic system 3 is powered on, the delay circuit drives intermediate relay B to operate, causing the intermediate moving contact of intermediate relay B to separate from the normally closed stationary contact and contact the normally open stationary contact. When the intermediate moving contact touches the normally open stationary contact, the starting coil 32 is shorted. When the intermediate moving contact separates from the normally closed stationary contact, the holding coil 33 is connected to the power supply. The feature of this embodiment is that after power-on, the holding coil 33 works instead of the starting coil 32, rather than the two working in series, achieving a better energy-saving and environmental protection effect.

[0176] As Figure 37 、 38 Example 3 of the first controllable element is shown. The first controllable element is MOS transistor Q1. Both ends of MOS transistor Q1 are connected in parallel across the holding coil 33. The control terminal of MOS transistor Q1 is connected to the RC delay circuit.

[0177] Further, the RC delay circuit includes a capacitor C1 and a resistor R3. One ends of the capacitor C1 and the resistor R3 are respectively connected to the control end of the MOS transistor Q1. The other end of the resistor R3 is respectively connected to one end of a capacitor C2 and the negative pole of a power supply. The other end of the capacitor C1 is respectively connected to one end of a resistor R2 and the positive pole of a diode D2. The negative pole of the diode D2, the other end of the resistor R2, and the other end of the capacitor C2 are respectively connected to the positive pole of the power supply. The diode D2 is used to ensure the polarity of the circuit current.

[0178] When the electromagnetic system 3 is powered on, the capacitor C1 is charged. The voltage across the capacitor C1 changes rapidly. Since the capacitive reactance of the capacitor C1 is low, the current flowing through the capacitor C1 is large. The capacitor C1 drives the control end of the MOS transistor Q1 to turn on the MOS transistor Q1 and short-circuit the holding coil 33. When the holding coil 33 is short-circuited, the current passing through the starting coil 32 flows to the MOS transistor Q1, enabling the starting coil 32 to operate in a high-power state to drive the moving iron core to drive the main shaft 121 and the moving contact bridge 120 to actuate. After the electromagnetic system 3 is powered on, the capacitor C1 is fully charged. The voltage across the capacitor C1 changes slowly. The capacitive reactance of the capacitor C1 becomes larger, resulting in a small current flowing through the capacitor C1. The capacitor C may not drive the control end of the MOS transistor Q1 to turn on the MOS transistor Q1, causing the MOS transistor Q1 to turn off. The original current flowing to the MOS transistor Q2 flows to the holding coil 33, making the starting coil 32 and the holding coil 33 connected in series.

[0179] Further, the RC delay circuit includes a plurality of capacitors C1, and the plurality of capacitors C1 are arranged in parallel. The effect of adjusting the delay period is achieved by changing the number of capacitors C1. Of course, changing the specifications of the capacitors C1 can also achieve the effect of adjusting the delay period.

[0180] Further, the RC delay circuit includes a plurality of resistors R2 and a plurality of resistors R3. When the direct specifications do not meet the requirements, a plurality of resistors R2 and a plurality of resistors R3 need to be connected in series and parallel according to the requirements to obtain a resistance value that meets the requirements. The resistor R3 divides the voltage to ensure the gate voltage of the MOS transistor Q1. Therefore, when adjusting the delay parameters and the resistor R is adjusted according to the calculation, the resistor R3 should be adjusted with the same proportional resistance value. The effect of adjusting the delay period is achieved by changing the number of the resistor R2 or the resistor R3. Of course, changing the specifications of the resistor R2 or the resistor R3 can also achieve the effect of adjusting the delay period.

[0181] Further, the voltage stabilization circuit includes a MOS transistor Q2 connected in series with the starting coil 32 and the holding coil 33, and a voltage stabilizing diode VR1 and a resistor R1 respectively connected to the control end of the MOS transistor Q2. The other ends of the voltage stabilizing diode VR1 and the resistor R1 are respectively connected to the power supply.

[0182] Further, the voltage stabilizing circuit further includes a varistor RY1 connected in parallel with the voltage stabilizing diode VR1 and the resistor R1. The varistor RY1 is used to eliminate and absorb the overvoltage of the power supply, playing a role in protection.

[0183] Further, the voltage stabilizing circuit further includes a diode D1. The anode of the diode D1 is connected to the positive pole of the power supply, and the cathode of the diode D1 is respectively connected to one end of the resistor R1 and the MOS transistor Q2. The diode D1 can ensure the polarity of the current in the circuit and improve the reliability of the circuit.

[0184] Further, the voltage stabilizing circuit includes multiple voltage stabilizing diodes, and the multiple voltage stabilizing diodes are connected in series. As Figure 35 shown, the voltage stabilizing circuit includes two voltage stabilizing diodes, which are respectively the voltage stabilizing diode VR1 and the voltage stabilizing diode VR2, and the voltage stabilizing diode VR1 and the voltage stabilizing diode VR2 are connected in series.

[0185] As Figure 42 shown, the circuit module 5 includes a second control circuit. The difference between the second control circuit and the first control circuit is that the second control circuit is connected to the starting coil 32 to reduce the working voltage of the starting coil 32, achieving the effect of energy conservation and environmental protection. The second control circuit can be used in cooperation with the first control circuit. On the basis that the first control circuit reduces the input of the external control power supply through voltage reduction, the second control circuit delays and then reduces the output voltage again, achieving the purpose of high-power suction and low-power holding. Of course, the first control circuit can also not be provided, and only the second control circuit is used for voltage reduction processing, which all fall within the protection scope of the present invention.

[0186] As Figures 41 - 43 Figure 42 shown, the second control circuit includes a second voltage stabilizing circuit and a delay voltage reduction circuit. The input end of the second voltage stabilizing circuit is connected to the power supply, and the output end of the second voltage stabilizing circuit is connected to the starting coil 32 to supply power to the starting coil 32. The second voltage stabilizing circuit includes at least two series-connected voltage stabilizing diodes. The delay voltage reduction circuit includes a second controllable element connected in parallel with both ends of at least one voltage stabilizing diode, and the control end of the second controllable element is connected to the second voltage stabilizing circuit through a capacitor C10.

[0187] When the electromagnetic system 3 is powered on, the capacitor C10 is charged, the second controllable element is turned off, and the rated working voltage is output to the starting coil 32 through multiple series-connected voltage stabilizing diodes; after the electromagnetic system 3 is powered on, the capacitor C10 is fully charged, the second controllable element is turned on, and at least one voltage stabilizing diode connected in parallel with the second controllable element is short-circuited, and the rated working voltage is output to the starting coil 32 through the remaining voltage stabilizing diodes in the second voltage stabilizing circuit.

[0188] The control circuit of the high-voltage DC relay of the present invention adopts mechatronics technology. Through the time-delay voltage reduction process of the second control circuit, the switching of the power of the electromagnetic system 3 does not require the mechanical structure of the main circuit to be linked. There is no need to encapsulate the circuit module 5 into the arc extinguishing mechanism, which ensures the purity of the arc extinguishing mechanism. At the same time, the structure is greatly simplified, ensuring the reliability of the product. In addition, even if the circuit module 5 is encapsulated into the arc extinguishing mechanism, due to its simple structure and good controllability, the assembly efficiency is also better than that of the mechanical linkage type double-coil structure.

[0189] Further, the second controllable element is a triode or a thyristor or a MOS transistor.

[0190] Further, the second voltage stabilizing circuit includes a MOS transistor Q10, a resistor R10 and two voltage stabilizing diodes. The two voltage stabilizing diodes are voltage stabilizing diode VR10 and voltage stabilizing diode VR20 respectively. One end of the MOS transistor Q10 and one end of the resistor R10 are respectively connected to the input end of the second voltage stabilizing circuit. The other end of the MOS transistor Q10 is connected to the output end of the second voltage stabilizing circuit. The control end of the MOS transistor Q10 is respectively connected to the other end of the resistor R10 and one end of the voltage stabilizing diode VR10. The other end of the voltage stabilizing diode VR10 is connected to the output end of the second voltage stabilizing circuit through the voltage stabilizing diode VR20. The collector and emitter of the triode Q20 of the time-delay voltage reduction circuit are connected in parallel across the two ends of the voltage stabilizing diode VR20.

[0191] Further, the second voltage stabilizing circuit further includes a varistor RY10 connected in parallel with the voltage stabilizing diode VR10, the voltage stabilizing diode VR20 and the resistor R10. The varistor RY10 is used to eliminate and absorb the overvoltage of the power supply and plays a role in protection.

[0192] Further, the second voltage stabilizing circuit further includes a diode D10. The positive pole of the diode D10 is connected to the input end of the second voltage stabilizing circuit. The negative pole of the diode D10 is respectively connected to one end of the resistor R10 and the MOS transistor Q20. The diode D10 can ensure the polarity of the current in the circuit and improve the reliability of the circuit.

[0193] As a preferred embodiment of the second controllable element, the second controllable element is a triode Q20. The collector and emitter of the triode Q20 are connected in parallel across the two ends of at least one voltage stabilizing diode in the second voltage stabilizing circuit. The base of the triode Q20 is connected to a capacitor C10. When the electromagnetic system 3 is powered on, the capacitor C10 is charged and the triode Q20 is turned off. After the electromagnetic system 3 is powered on, the capacitor C10 is fully charged, the triode Q20 is turned on and shorts the voltage stabilizing diode connected in parallel between its collector and emitter.

[0194] Further, the delay step-down circuit further includes a resistor R20 and a resistor R30. One end of the resistor R20 is connected to one end of the MOS transistor Q10. The other end of the resistor R20 is respectively connected to a capacitor C10 and the base of a triode Q20. Both ends of the resistor R30 are respectively connected to the collector and the emitter of the triode Q20.

[0195] Further, the delay step-down circuit further includes a diode D20, a diode D30 and a diode D40. The positive electrode of the diode D40 is respectively connected to the base of the triode Q20, one end of the resistor R20 and one end of the capacitor C10. The negative electrode of the diode D40 is connected to one end of the MOS transistor Q10. The emitter of the triode Q20 is connected to the positive electrode of the diode D20. The negative electrode of the diode D20 is connected to the positive electrode of the diode D30. The negative electrode of the diode D30 is connected to one end of a voltage regulator diode VR20.

[0196] The above content is a further detailed description of the present invention in combination with specific preferred embodiments. It cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should all be regarded as falling within the protection scope of the present invention.

Claims

1. An auxiliary contact system for a DC relay, characterized in that: The invention comprises a housing assembly, a static contact mechanism (11), a dynamic contact mechanism (12), an auxiliary contact system and a circuit module (5) arranged in the housing assembly, wherein the static contact mechanism (11) comprises two static contacts (110), the dynamic contact mechanism (12) comprises a dynamic contact bridge (120), the dynamic contact mechanism (12) can drive the dynamic contact bridge (120) to contact and separate with the two static contacts (110), the auxiliary contact system comprises at least one auxiliary contact mechanism (6a) arranged on one side of the dynamic contact mechanism (12), each auxiliary contact mechanism comprises a shifting rod (61) and at least two mutually cooperating springs, the circuit module (5) is provided with an indication circuit connected with the at least two springs, one end of the shifting rod (61) is connected to the dynamic contact mechanism (12), and the other end of the shifting rod (61) cooperates with the at least one spring, and when the dynamic contact mechanism (12) is actuated, the shifting rod (61) drives the at least one spring to make the two springs contact or separate, thereby turning the indication circuit on or off. The invention also includes three springs, the three springs being an upper spring (641), a lower spring (642) and a middle spring (643) respectively connected to the circuit module (5), the upper spring (641) and the lower spring (642) being arranged opposite to each other and respectively located on both sides of one end of the middle spring (643), the other end of the middle spring (643) being connected to the circuit module (5), the middle of the middle spring (643) being matched with the shifting rod (61), and the shifting rod (61) pushing the middle spring (643) when it moves. The middle spring (643) is in contact with the upper spring (641) or the lower spring (642), one end of the middle spring (643) is matched with one end of the upper spring (641) and the lower spring (642), the other end of the middle spring (643) is connected to one end of the holding coil (33), the other end of the lower spring (642) is connected to the other end of the holding coil (33) of the electromagnetic system (3), and the other end of the upper spring (641) is connected to the indicating circuit of the circuit module (5).

2. The auxiliary contact system of a DC relay according to claim 1, characterized in that: The electromagnetic system (3) further comprises an electromagnetic system (3), the electromagnetic system (3) comprising a starting coil (32) and a holding coil (33) connected in series, the two ends of the holding coil (33) being respectively connected to at least two reeds of the auxiliary contact mechanism (6a), and when the electromagnetic system (3) is powered on, the moving contact mechanism (12) is driven to move the moving contact bridge (120), while the holding coil (33) is short-circuited by the two reeds; after the electromagnetic system (3) is powered on, a lever (61) connected to the moving contact mechanism (12) separates the two reeds, thereby connecting the starting coil (32) and the holding coil (33) in series.

3. The auxiliary contact system of a DC relay according to claim 1, characterized in that: The dynamic contact mechanism (12) comprises a main shaft (121), a dynamic contact bridge (120), and an insulating mechanism. One end of the main shaft (121) cooperates with the electromagnetic system (3), and the other end of the main shaft (121) cooperates with the dynamic contact bridge (120). The electromagnetic system (3) can drive the main shaft (121) to drive the dynamic contact bridge (120) to contact or separate with the static contact (110). The shifting rod (61) is connected to the insulating mechanism.

4. The auxiliary contact system of a DC relay according to claim 3, characterized in that: The insulating mechanism comprises a middle insulating sleeve (131) of a hollow structure, and an upper insulating sleeve (132) and a lower insulating sleeve (133) respectively arranged at both ends of the middle insulating sleeve (131); the middle insulating sleeve (131) is arranged between the outer side of the main shaft (121) and the inner side of the main shaft hole of the moving contact bridge (120); the upper insulating sleeve (132) is located on a side of the moving contact bridge (120) close to the static contact (110); and the shift rod (61) is connected to the upper insulating sleeve (132).

5. The auxiliary contact system of a DC relay according to claim 1, characterized in that: The invention comprises two springs, the two springs being a static spring (631) and a dynamic spring (632) respectively connected to the circuit module (5); the dynamic spring (632) being longer than the static spring (631); the end of the static spring (631) close to the shifting rod (61) being spaced apart from the shifting rod (61); and the end of the dynamic spring (632) close to the shifting rod (61) extending to one side of the shifting rod (61) for engagement.

6. The auxiliary contact system of a DC relay according to claim 5, characterized in that: The second auxiliary contact mechanism (6b) is also included. The second auxiliary contact mechanism (6b) has the same structure as the auxiliary contact mechanism (6a). The movable springs (632) of the second auxiliary contact mechanism (6b) and the auxiliary contact mechanism (6a) are respectively arranged on both sides of their respective shifting rods (61) along the moving direction of the movable contact mechanism (12). The shifting rod (61) of the auxiliary contact mechanism (6a) and the shifting rod (61) of the second auxiliary contact mechanism (6b) are arranged at the same height, and the movable contact mechanism (12) can drive The lever (61) of the auxiliary contact mechanism (6a) and the lever (61) of the second auxiliary contact mechanism (6b) move simultaneously. When the dynamic contact mechanism (12) moves to one side, the lever (61) of one of the second auxiliary contact mechanism (6b) and the auxiliary contact mechanism (6a) can push its corresponding dynamic reed (632) to separate from the static reed (631), while the lever (61) of the other one moves away from its corresponding dynamic reed (632), so that the dynamic reed (632) contacts the static reed (631).

7. The auxiliary contact system of a DC relay according to claim 2, characterized in that: The electromagnetic system (3) comprises a coil frame (31) and a starting coil (32) wound on the outside of the coil frame (31); an auxiliary mounting mechanism for mounting the auxiliary contact system is provided on the coil frame (31); the auxiliary mounting mechanism comprises a socket (314) and a plurality of connecting pieces (317); a slot (316) for a position limiting circuit module (5) is provided on the socket (314); and the plurality of connecting pieces (317) are respectively connected between the circuit module (5) and the electromagnetic system (3).

8. The auxiliary contact system of a DC relay according to claim 7, characterized in that: The invention also includes a housing assembly, the housing assembly including a magnetic conductive plate (140) arranged between the electromagnetic system (3) and the dynamic contact mechanism (12), the dynamic contact mechanism (12) being provided with a moving iron core (123) extending through the magnetic conductive plate (140) to the inner side of the coil frame (31), and the magnetic conductive plate (140) being provided with an auxiliary installation notch (620) for avoiding the auxiliary installation mechanism.

9. The auxiliary contact system of a DC relay according to claim 7, characterized in that: The coil frame (31) comprises two upper side plates (311) and a lower side plate (312) arranged oppositely, and a coil barrel (313) connected between the upper side plate (311) and the lower side plate (312). A starting coil (32) and a holding coil (33) wound around the outside of the coil barrel (313) are provided between the upper side plate (311) and the lower side plate (312). The socket (314) comprises two mounting bars (3141) arranged oppositely, and the two mounting bars (3141) are respectively connected vertically to the upper side plates (311). The circuit module (5) is installed between the two mounting bars (3141). Slots (316) are respectively provided on the inner sides of the two mounting bars (3141). The side edges of the circuit module (5) are respectively limited by the slots (316) on both sides.

10. The auxiliary contact system of a DC relay according to claim 9, characterized in that: A connecting seat (315) for mounting a connecting piece (317) is provided at the edge of the upper side plate (311). The middle portion of the connecting piece (317) passes through the connecting seat (315) and is arranged perpendicular to the upper side plate (311). One end of the connecting piece (317) extends to one side of the circuit module (5), and the other end of the connecting piece (317) extends to the outside of the starting coil (32).

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