CN210607116U - Contact system of direct current relay - Google Patents

Abstract

A contact system of a direct current relay comprises a shell assembly, a static contact mechanism and a movable contact mechanism, wherein the static contact mechanism and the movable contact mechanism are arranged in the shell assembly, the static contact mechanism comprises two static contacts, the movable contact mechanism comprises a main shaft, a movable contact bridge and an insulation mechanism, one end of the main shaft is matched with an electromagnetic system, the other end of the main shaft is matched with the movable contact bridge, a main shaft hole which is sleeved on the outer side of the main shaft is arranged in the middle of the movable contact bridge, the electromagnetic system can drive the main shaft to drive the movable contact bridge to be in contact with or separate from the static contacts, the insulation mechanism comprises an upper insulation sleeve which is arranged on one side of the movable contact bridge close to the static contacts, the upper insulation sleeve comprises an insulation middle plate which is matched with the middle of the movable contact bridge and insulation side plates which are respectively arranged on two sides of the insulation middle plate, a blocking mechanism is arranged on one side of the insulation side plate close to, the risk of breakdown is effectively reduced.

Description

Contact system of direct current relay

Technical Field

The utility model relates to a relay field especially relates to a direct current relay's contact system.

Background

The high-voltage direct-current relay is mainly applied to the field of new energy, particularly a charging and discharging system of a charging pile and a charging and discharging system of a new energy automobile, and in order to improve the energy utilization rate of the whole system, the rated working voltage of the system is generally 450VDC-750VDC, and the rated working voltage is further improved to 950 VDC.

However, if the current direction of the conventional high-voltage direct-current relay is mistakenly connected in the opposite direction, two arcs in a magnetic field are intensively stretched towards the middle part, and the risk of breakdown exists.

Particularly, when an arc is extinguished through magnetic field arc blowing, a static contact of a load circuit needs to be placed in a magnetic field which penetrates through the current direction of the load circuit and forms an included angle of 90 degrees, and the arc direction of the load circuit is deflected by utilizing the lorentz force of the arc in the magnetic field, so that the arc is lengthened and cooled, the arc is extinguished, and the risk of breakdown is further increased if the current directions are opposite.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art's defect, provide a simple structure, insulating high direct current relay's contact system.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a contact system of a direct current relay comprises a shell assembly, a static contact mechanism and a movable contact mechanism, wherein the static contact mechanism and the movable contact mechanism are arranged in the shell assembly, the static contact mechanism comprises two static contacts, the movable contact mechanism comprises a main shaft, a movable contact bridge and an insulation mechanism, one end of the main shaft is matched with an electromagnetic system, the other end of the main shaft is matched with the movable contact bridge, a main shaft hole which is sleeved on the outer side of the main shaft is formed in the middle of the movable contact bridge, the electromagnetic system can drive the main shaft to drive the movable contact bridge to be in contact with or separate from the static contacts, the insulation mechanism comprises an upper insulation sleeve which is located on one side, close to the static contacts, of the movable contact bridge, the upper insulation sleeve comprises an insulation middle plate which is matched with the middle of the movable contact bridge and insulation.

Preferably, the static contact mechanism includes a ceramic base for fixing the static contacts, one end of each of the two static contacts respectively penetrates through the ceramic base and is respectively matched with two ends of the movable contact bridge, and an insulating partition is arranged on one side of the ceramic base close to the movable contact bridge and located between the two static contacts.

Preferably, the upper insulating sleeve further comprises insulating side lugs extending to one side far away from the fixed contact, at least two insulating side lugs are arranged on each insulating side plate, and the at least two insulating side lugs are oppositely arranged on two sides of the movable contact bridge along the width direction of the movable contact bridge.

Preferably, the widths of the two insulating side plates are gradually increased along the direction close to the end part of the movable contact bridge, the two sides of the two insulating side plates in the width direction are respectively provided with an insulating side surface which is obliquely arranged with the length direction of the movable contact bridge, one end of each of the two insulating side surfaces on the two sides of each insulating side plate is connected with the insulating middle plate, and the other end of each of the two insulating side surfaces on the two sides of each insulating side plate is respectively connected with the side edge of the insulating side lug.

Preferably, the blocking mechanism comprises a plurality of insulating transverse ribs arranged on the top side of the insulating side plate, and the length directions of the insulating transverse ribs are all perpendicular to the length direction of the movable contact bridge.

Preferably, the blocking mechanism comprises an insulating baffle plate vertically arranged on the top side of the insulating side plate.

Preferably, the side face of the insulating baffle far away from one side of the insulating middle plate is provided with a plurality of insulating longitudinal ribs.

Preferably, the length of the insulating baffle along the width direction of the movable contact bridge is greater than that of the insulating side plates, the two ends of the insulating baffle are respectively provided with an insulating stop lug extending towards the two sides of the movable contact bridge, and the two insulating stop lugs at the two ends of each insulating baffle are respectively connected with the outer sides of the two insulating side lugs of the insulating side plates.

Preferably, the top side of the insulating middle plate is provided with an insulating ring surrounding the periphery of the top end of the main shaft, a clamping ring in an annular structure is arranged in the upper insulating sink groove, and the inner side of the clamping ring is connected with the main shaft; the top sides of the two insulating side plates are respectively provided with a reinforcing rib, one end of each reinforcing rib is respectively connected with the bottom of the side face, close to the two insulating baffles, of each insulating baffle, and the other end of each reinforcing rib is respectively connected with the two sides of the insulating ring of the insulating middle plate.

Preferably, the static contact mechanism comprises a ceramic base for fixing the static contacts, one ends of the two static contacts respectively penetrate through the ceramic base and are respectively matched with two ends of the movable contact bridge, one side of the ceramic base close to the movable contact bridge is provided with two insulating partition plates which are oppositely arranged, and the two insulating partition plates are positioned between the two static contacts; the blocking mechanism comprises two insulating baffle plates vertically arranged on the top sides of the insulating side plates on the two sides, and the bottoms of the two insulating baffle plates extend to the inner sides of the two insulating baffle plates respectively.

The utility model discloses a direct current relay's contact system, when the current direction misconnection was reversed, go up insulating cover and can avoid electric arc to concentrate tensile to the middle part through the barrier mechanism on insulating curb plate and the insulating curb plate, effectively reduce the risk of puncturing.

Drawings

FIG. 1 is an exploded view of a first embodiment of a contact system according to the present invention;

FIG. 2 is a cross-sectional view of a first embodiment of a contact system according to the present invention;

FIG. 3 is a schematic structural diagram of a first embodiment of a contact system according to the present invention;

fig. 4 is a cross-sectional view of a first embodiment of an insulating sleeve according to the present invention;

fig. 5 is a schematic structural view of a first embodiment of an upper insulating sleeve according to the present invention;

fig. 6 is a cross-sectional view of the embodiment of the present invention shown in fig. 5;

FIG. 7 is a cross-sectional view of a second embodiment of an upper insulating sleeve according to the present invention;

fig. 8 is a schematic structural view of a second embodiment of an upper insulating sleeve according to the present invention;

fig. 9 is a cross-sectional view of the embodiment of the present invention shown in fig. 8;

fig. 10 is an exploded view of a second embodiment of a contact system in accordance with an embodiment of the present invention;

fig. 11 is a cross-sectional view of a first embodiment of a contact system according to the present invention;

fig. 12 is a schematic structural diagram of a second embodiment of a contact system according to the present invention;

fig. 13 is a side view of a first embodiment of an auxiliary contact system according to the present invention;

fig. 14 is a schematic structural diagram of a first embodiment of an auxiliary contact system according to the present invention;

fig. 15 is another side view of a first embodiment of an auxiliary contact system in accordance with the present invention;

fig. 16 is another schematic structural diagram of a second embodiment of an auxiliary contact system according to the present invention;

fig. 17 is a schematic view of the fitting of the stationary spring and the movable spring according to the embodiment of the present invention;

fig. 18 is a side view of a second embodiment of an auxiliary contact system in accordance with an embodiment of the present invention;

fig. 19 is a schematic structural diagram of a second embodiment of an auxiliary contact system according to the present invention;

fig. 20 is another side view of a second embodiment of an auxiliary contact system in accordance with an embodiment of the present invention;

fig. 21 is another schematic structural diagram of a second embodiment of an auxiliary contact system according to the present invention;

FIG. 22 is a schematic view of the upper spring plate, the lower spring plate and the middle spring plate of the embodiment of the present invention;

figure 23 is a cross-sectional view of an electromagnetic system in accordance with an embodiment of the present invention;

fig. 24 is a schematic view of the engagement between the stationary spring plate and the movable spring plate and the electromagnetic system according to the embodiment of the present invention;

FIG. 25 is a drawing showing the upper spring plate, the lower spring plate, the middle spring plate and the electromagnetic system according to the embodiment of the present invention;

fig. 26 is a schematic structural diagram of a coil bobbin according to an embodiment of the present invention;

fig. 27 is a cross-sectional view of an arc extinguishing mechanism in cooperation with an auxiliary contact system in accordance with an embodiment of the present invention;

fig. 28 is a schematic diagram of the arc extinguishing mechanism and the auxiliary contact system according to the embodiment of the present invention;

fig. 29 is a schematic side view of an arc cutting mechanism cutting an arc in accordance with an embodiment of the present invention;

fig. 30 is a top schematic view of an arc cutting mechanism cutting an arc in accordance with an embodiment of the present invention;

fig. 31 is a schematic structural view of an arc extinguishing mechanism according to an embodiment of the present invention;

fig. 32 is a top view of an arc extinguishing mechanism according to an embodiment of the present invention;

fig. 33 is a left side view of an arc extinguishing mechanism according to an embodiment of the present invention;

fig. 34 is a front view of an arc extinguishing mechanism according to an embodiment of the present invention;

FIG. 35 is a third embodiment of the first controllable element of the present invention;

FIG. 36 illustrates a first embodiment of a first controllable element according to an embodiment of the present invention;

FIG. 37 is a second embodiment of the first controllable element according to the present invention;

fig. 38 is a schematic circuit diagram of the embodiment of the present invention shown in fig. 35;

fig. 39 is a voltage variation diagram of the first control circuit according to the embodiment of the present invention when it is matched with the electromagnetic system;

fig. 40 is a diagram of the current variation when the first control circuit is coupled to the electromagnetic system according to the embodiment of the present invention;

fig. 41 is a schematic diagram of a second control circuit according to an embodiment of the present invention;

fig. 42 is a schematic circuit diagram of a second control circuit according to an embodiment of the present invention;

fig. 43 is a voltage variation diagram of the second control circuit according to the embodiment of the present invention when it is matched with the electromagnetic system;

fig. 44 is a schematic structural view of a housing according to an embodiment of the present invention;

fig. 45 is a partial cross-sectional view of a housing in accordance with an embodiment of the present invention.

Detailed Description

The following describes a specific embodiment of the contact system of the dc relay according to the present invention with reference to the embodiments shown in fig. 1 to 45. The contact system of the dc relay of the present invention is not limited to the description of the following embodiments.

As shown in fig. 1-2, the utility model discloses a direct current relay includes housing assembly to and contact system, electromagnetic system 3 and the circuit module 5 of setting in housing assembly, contact system includes relative static contact mechanism 11 that sets up and moves contact mechanism 12, and static contact mechanism 11 includes two static contacts 110, moves contact mechanism 12 including with two static contact 110 complex movable contact bridge 120, and two static contacts 110 insert the main circuit respectively, and electromagnetic system 3 can drive movable contact bridge 120 and two static contacts 110 contact, makes movable contact bridge 120 form between two static contacts 110 and switches on the main circuit. The utility model discloses a direct current relay is applicable to the high pressure that rated operating voltage is 450VDC-750VDC to there is the further rated operating voltage that improves to 950 VDC.

The utility model discloses an improvement point lies in, sets up insulating mechanism in contact system, strengthens contact system's insulation through insulating mechanism, and insulating mechanism can avoid moving contact mechanism 12 and 3 punctures of electromagnetic system.

The utility model discloses a another improvement point lies in, sets up blocking mechanism in contact system, connects when reverse when the electric current direction mistake, and blocking mechanism can avoid electric arc to concentrate tensile to the middle part, reduces the risk of puncturing.

The utility model discloses a still another improvement point lies in, sets up sealing mechanism 157 in contact system, and sealing mechanism 157 not only can improve contact system's leakproofness, can reduce the problem of revealing of the welding seam fracture that leads to because the coefficient of expansion is inconsistent moreover when temperature variation.

The utility model discloses a still another improvement point lies in, still include with contact system complex auxiliary contact system, last being equipped with of insulating mechanism with auxiliary contact system complex driving lever, the contact system drives auxiliary contact system through the driving lever and moves together when moving, has simple structure and small characteristics.

Another improvement point of the present invention is that, the voltage of the electromagnetic system 3 during power-on and during continuous power-on after power-on is changed, the working power of the electromagnetic system 3 is increased during power-on, so that the contact bridge 120 and the static contact 110 are in contact more quickly; and after the electromagnetic system 3 is powered on, the working voltage is reduced so as to reduce the loss of electric energy.

Fig. 1 to 9 show a first embodiment of a contact system, and fig. 10 to 12 show a second embodiment of a contact system, which are different mainly in the structure of the contact system, but the stationary contact mechanism 11 of the contact systems of the two embodiments includes a ceramic holder 111 for fixing a stationary contact 110.

As shown in fig. 1-3, in the first embodiment of the contact system, the ceramic base 111 is a half-box structure, and the ceramic base 111 is buckled upside down on the movable contact mechanism 12.

As shown in fig. 10 to 12, in the second embodiment of the contact system, the ceramic base 111 is a flat plate-shaped structure, the ceramic base 111 is disposed inside the opening edge of the inner casing 141 of the housing assembly, the sealing mechanism 157 is disposed between the periphery of the ceramic base 111 and the inner wall of the inner casing 141, and a sealed space is formed between the ceramic base 111 and the inner casing 141 by the sealing mechanism 157.

As fig. 4-6 show the embodiments of the insulating means, the structure of the insulating means is the same in both embodiments of the contact system. The movable contact mechanism 12 includes a main shaft 121 and a movable contact bridge 120, one end of the main shaft 121 is matched with the electromagnetic system 3, the other end of the main shaft 121 is matched with the movable contact bridge 120, a main shaft hole sleeved on the outer side of the main shaft 121 is arranged in the middle of the movable contact bridge 120, and the electromagnetic system 3 can drive the main shaft 121 to drive the movable contact bridge 120 to contact with or separate from the fixed contact 110.

The insulating mechanism comprises a middle insulating sleeve 131 with a hollow structure, and an upper insulating sleeve 132 and a lower insulating sleeve 133 which are respectively arranged at two ends of the middle insulating sleeve 131, wherein the middle insulating sleeve 131 is arranged between the outer side of the main shaft 121 and the inner side of a main shaft hole of the movable contact bridge 120, the lower insulating sleeve 133 is positioned at one side of the movable contact bridge 120 far away from the fixed contact 110, the lower insulating sleeve 133 is connected with the middle insulating sleeve 131, an overtravel spring 134 connected between the lower insulating sleeve 133 and the movable contact bridge 120 is arranged at the outer side of the middle insulating sleeve 131, the upper insulating sleeve 132 is positioned at one side of the movable contact bridge 120 close to the fixed contact 110, and the upper insulating sleeve 132 is in threaded connection or other connection with the main shaft 121;

when the movable contact bridge 120 is separated from the fixed contact 110, the overtravel spring 134 pushes the movable contact bridge 120 to be limited by the upper insulating sleeve 132;

when the moving contact bridge 120 is in contact with the fixed contact 110, the fixed contact 110 pushes the moving contact bridge 120 to be separated from the upper insulating sleeve 132 and compresses the over travel spring 134.

The utility model discloses a contact system of high-voltage direct-current relay, through not only forming effectual insulating effect between movable contact bridge 120 and the inboard main shaft 121 of main shaft hole through well insulating cover 131, prevent to appear electric breakdown between movable contact bridge 120 and the main shaft 121, go up insulating cover 132 in addition and can enough play the effect that improves insulating effect, can be used for limiting movable contact bridge 120 with the cooperation of over travel spring 134 again, have simple structure, the part is few, with low costs and the characteristics of the assembly of being convenient for. In addition, when the moving contact bridge 120 contacts with the fixed contact 110, the fixed contact 110 pushes the moving contact bridge 120 to separate from the upper insulating sleeve 132 and compress the over travel spring 134, so that the electrical distance between the main shaft 121 and the moving contact bridge 120 is further increased, and the reliability is higher.

Further, the middle insulating sleeve 131 and the lower insulating sleeve 133 are of an integrally formed T-shaped structure, one end of the middle insulating sleeve 131, which is far away from the lower insulating part 132, is higher than the movable contact bridge 120, the upper insulating sleeve 132 is sleeved outside the end part of the middle insulating sleeve 131, which is higher than the movable contact bridge 120, in an annular structure, an upper insulating sink groove 135 is formed in the edge of the top side of the inner ring of the upper insulating sleeve 132, a collar 136 in an annular structure is arranged in the upper insulating sink groove 135, and the inner side of the collar 136 is connected with the main shaft 121. Of course, the middle insulating sleeve 131 may be formed integrally with the upper insulating sleeve 132 in reverse, and the lower insulating sleeve 133 is connected to the middle insulating sleeve 131 through the collar 136, which all belong to the protection scope of the present invention.

Further, lower insulating part 132 is equipped with on the side that is close to movable contact bridge 120 and is annular lower insulating heavy groove 137, and overtravel spring 134 overlaps on well insulating cover 131, and the one end that overtravel spring 134 kept away from movable contact bridge 120 stretches down spacing cooperation in insulating heavy groove 137, and lower insulating heavy groove 137 can be convenient for fix a position overtravel spring 134, reduces the assembly degree of difficulty to prevent that overtravel spring 134 from crooked at the during operation.

Specifically, the spindle 121 includes a middle shaft portion 121b penetrating through the magnetic conductive plate 140, and an upper shaft portion 121a and a lower shaft portion 121c respectively disposed at two ends of the middle shaft portion 121b, the upper shaft portion 121a is connected to the movable contact bridge 120 through an insulating mechanism, the lower shaft portion 121c extends to the inner side of the electromagnetic system 3, a movable iron core 123 is disposed on the lower shaft portion 121c, and the movable iron core 123 is connected to the magnetic conductive plate 140 through a return spring 127. The electromagnetic system 3 can drive the movable iron core 123 to drive the main shaft 121 to move, and the return spring 127 drives the main shaft 121 to return after moving.

Furthermore, the middle insulating sleeve 131 is sleeved outside the upper shaft part 121a, the outer diameter of the upper shaft part 121a is smaller than that of the middle shaft part 121b, an upper step 129 in limit fit with the lower insulating sleeve 133 is formed at the joint of the upper shaft part 121a and the middle shaft part 121c, and a clamping groove 124 in limit fit with the clamping ring 136 is formed in the circumferential surface of one end, far away from the middle shaft part 121c, of the upper shaft part 121 a.

Preferably, the edge of the upper step 129 extends outward along the radial direction of the lower insulating sleeve 133, so that the limiting effect is more reliable.

Preferably, a gasket is arranged between the upper step 129 and the lower insulating sleeve 133, so that the limiting effect is further improved.

Further, the lower shaft portion 121c has an outer diameter smaller than that of the middle shaft portion 121b, a lower step 125 for stopping the plunger 123 is formed at a junction of the lower shaft portion 121c and the middle shaft portion 121c, an iron core limiting piece 128 used for limiting the movable iron core 123 is arranged at one end of the lower shaft portion 121c, which is far away from the middle shaft portion 121c, the movable iron core 123 is sleeved outside the lower shaft portion 121c and the middle shaft portion 121b in a cylindrical structure, an iron core sinking groove 126 which is arranged around the middle shaft portion 121b is arranged at one end, which is near to the magnetic conductive plate 140, of the inner wall of the movable iron core 123, the bottom wall of the iron core sinking groove 126 is in limiting fit with the lower step 125, the end face, which is far away from one end of the magnetic conductive plate 140, of the movable iron core 123 is in limiting fit with the iron core limiting piece 128, the reset 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 reset spring 127 abuts against.

Fig. 4-6 illustrate a first embodiment of the upper insulating sleeve 132, and fig. 7-9 illustrate a second embodiment of the upper insulating sleeve 132, both embodiments of the upper insulating sleeve 132 having the following features:

the upper insulating sleeve 132 includes an insulating middle plate 1321 matched with the middle of the moving contact bridge 120 and insulating side plates 1322 respectively disposed at two sides of the insulating middle plate 1321, and a blocking mechanism is disposed at one side of the insulating side plate 1322 close to the stationary contact 110.

The utility model discloses a contact system of high voltage direct current relay connects when the electric current direction mistake is contrary, goes up insulating cover 132 and can avoid electric arc to concentrate tensile to the middle part through the barrier mechanism on insulating curb plate 1322 and the insulating curb plate 1322, effectively reduces the risk of puncturing.

The insulating side plates 1322 may be disposed only on one side of the insulating middle plate 1321, or the insulating partition plates 1322 may be disposed on both sides, in this embodiment, it is preferable that two insulating side plates 1322 are included, the two insulating side plates 1322 are disposed on both sides of the insulating middle plate 1321, and extend to both ends of the movable contact bridge 120 along the length direction of the movable contact bridge 120, respectively, the blocking mechanisms are disposed on top sides of the two insulating side plates 1322, and the insulating side plates 1322 are disposed on both sides to cover the surface of the movable contact bridge 120, so that the insulating effect can be improved. Of course, it is also within the scope of the present invention to provide the insulating side plate 1322 on only one side of the insulating middle plate 1321.

Further, the upper insulating sleeve 132 further includes insulating side tabs 1323 extending to a side away from the fixed contact 110, at least two insulating side tabs 1323 are disposed on each insulating side plate 1322, and the at least two insulating side tabs 1323 are disposed on two sides of the movable contact bridge 120 along the width direction of the movable contact bridge 120 and are higher than the movable contact bridge 120. The insulating side lug 1323 can increase the shielding area of the upper insulating sleeve 132, improve the insulating protection effect, and can still play a good insulating protection role even if the static contact 110 pushes the movable contact bridge 120 to be separated from the upper insulating sleeve 132 during overtravel.

Further, the widths of the two insulating side plates 1322 are gradually increased along the direction close to the end of the moving contact bridge 120, two sides of the two insulating side plates 1322 in the width direction are respectively provided with an insulating side surface which is obliquely arranged with the length direction of the moving contact bridge 120, one end of each of the two insulating side surfaces at two sides of each insulating side plate 1322 is connected with the insulating middle plate 1321, and the other end of each of the two insulating side surfaces at two sides of each insulating side plate 1322 is respectively connected with the side edge of the insulating side lug 1323. By gradually increasing the width of the insulating side plates 1322, a better insulating effect can be obtained.

Further, the top side of the middle insulating plate 1321 is provided with an insulating ring 1324 surrounding the top end of the spindle 121, because the top end of the spindle 121 is higher than the top side surface of the middle insulating plate 1321, the middle part of the upper insulating sleeve 132 is provided with an upper insulating sinking groove 135, a collar 136 in an annular structure is arranged in the upper insulating sinking groove 135, and the inner side of the collar 136 is connected with the spindle 121. The insulation ring 1324 not only can improve the insulation effect between the upper insulation sleeve 132 and the main shaft 121, but also can improve the structural strength of the upper insulation sleeve 132.

The two embodiments of the upper insulating sheath 132 differ in the structure of the blocking mechanism:

as shown in fig. 4 to 6, in the first embodiment of the upper insulating sleeve 132, the blocking mechanism of this embodiment includes a plurality of insulating transverse ribs 1325 disposed on the top side of the insulating side plate 1322, and the length directions of the plurality of insulating transverse ribs 1325 are all disposed perpendicular to the length direction of the movable contact bridge 120. Preferably, three insulating transverse ribs 1325 are provided on the top side of each insulating side plate 1322 in parallel and spaced apart relation.

As shown in fig. 7-8, in the second embodiment of the upper insulating sleeve 132, the blocking mechanism of this embodiment includes an insulating blocking plate 1326 vertically disposed on the top side of the insulating side plate 1322, and the height of the insulating blocking plate 1326 is higher than that of the insulating transverse rib 1325, so that a more reliable insulating effect can be achieved.

Further, the side surface of the insulating baffle 1326, which is far away from the insulating middle plate 1321, is provided with a plurality of insulating longitudinal ribs 1327. When the insulating baffles 1326 are disposed on both of the insulating side plates 1322, a plurality of insulating longitudinal ribs 1327 are disposed on the side surfaces of the insulating baffles 1326 that are away from each other. The insulating effect of the insulating baffle 1326 can be further improved by the insulating longitudinal ribs 1327, and when the electric arc is stretched towards the middle part, the electric arc is cut and dispersed, so that the purpose of rapidly extinguishing the electric arc is achieved.

Further, the length of the insulating baffle 1326 along the width direction of the moving contact bridge 120 is greater than that of the insulating side plate 1322, the two ends of the insulating baffle 1326 are respectively provided with an insulating stop ear 1328 extending towards the two sides of the moving contact bridge 120, and the two insulating stop ears 1328 at the two ends of each insulating baffle 1326 are respectively connected with the outer sides of the two insulating side ears 1323 of the insulating side plate 1322.

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

As shown in fig. 4, one end of each of the two fixed contacts 110 respectively penetrates through the ceramic base 111 and is respectively matched with two ends of the moving contact bridge 120, an insulating partition 1111 is disposed on one side of the ceramic base 111 close to the moving contact bridge 120, and the insulating partition 1111 is located between the two fixed contacts 110.

The number of the insulating partition 1111 may be one, or may be multiple, and the present embodiment includes two insulating partitions 1111 disposed opposite to each other, and both the two insulating partitions 1111 are disposed perpendicular to the length direction of the moving contact bridge 120.

As shown in fig. 7, the two insulation partitions 1111 are matched with the second embodiment of the upper insulation sleeve 132, and the blocking mechanism includes insulation baffles 1326 vertically disposed at the top sides of the two insulation side plates 1322, respectively, and the bottoms of the two insulation partitions 1111 extend to the inner sides of the two insulation baffles 1326, respectively. The combination of the insulating partition 1111 and the insulating baffle 1326 in the longitudinal direction can further improve the insulating effect and prevent the electric arc from extending to the middle part to be broken down when the circuit is connected reversely.

Fig. 3-4 illustrate a first embodiment of the sealing mechanism 157, fig. 10-12 illustrate a second embodiment of the sealing mechanism 157, the two embodiments of the sealing mechanism 157 are structurally different, 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, but both embodiments of the sealing mechanism 157 have the following features:

the ceramic seat 111 is connected with the shell assembly through the sealing mechanism 157, the side surface of the sealing mechanism 157 is welded with the ceramic seat 111, and the other side surface of the sealing mechanism 157 is welded with the shell assembly.

The utility model discloses a contact system of high voltage direct current relay, through with sealing mechanism 157's both sides respectively with ceramic seat 111 and casing subassembly welding, not only the leakproofness is high, the reliability is high moreover.

Further, insulating fillers surrounding the welding positions are respectively arranged between the side surface of the first sealing element 151 and the ceramic base 111 and between the side surface of the second sealing element 152 and the shell assembly.

The periphery of the side welding part of the first sealing member 151 and the second sealing member 152 can be filled with the plastic insulating filler, so that the contact area between the sealing mechanism 157 and the sealed part is increased, and meanwhile, the sealing performance of the connection weak part is also improved. The welding may be performed in various manners, in this embodiment, laser welding, brazing or soldering is preferable, the insulating filler is not particularly limited, and in this embodiment, resin is preferable.

Further, the sealing mechanism 157 includes a first sealing member 151, a second sealing member 152 arranged at intervals, and an intermediate sealing member 153 connected between the first sealing member 151 and the second sealing member 152, wherein the intermediate sealing member 153 of the first sealing member 151 and the second sealing member 152 is formed by integrating kovar alloy materials.

The utility model discloses a contact system of high voltage direct current relay, first sealing member 151 and second sealing member 152 through sealing mechanism 157 respectively with the part welding, and connect between first sealing member 151 and second sealing member 152 through middle sealing member 153, not only have bigger structural deflection, the change of cold and hot size down in turn has been reduced, the fracture phenomenon has been alleviateed, moreover, alloy material integrated into one piece's sealing mechanism 157 can be fell, can be after cold and hot change, avoid because the inconsistent welding seam fracture that leads to of coefficient of expansion and the problem of revealing.

Fig. 1 shows the structure of the housing assembly in a first embodiment of the contact system, fig. 10 shows the structure of the housing assembly in a second embodiment of the contact system, the housing assemblies of the two embodiments of the contact system being substantially identical and having the following features:

the shell assembly comprises an outer shell assembly and an inner shell assembly arranged on the inner side of the outer shell assembly, the electromagnetic system 3, the movable contact mechanism 12, the static contact system 11 and the circuit module 5 are sequentially arranged in the inner shell assembly, the outer shell assembly comprises an outer shell 143 and an outer cover 144, the inner shell assembly comprises an inner shell 141 and an inner cover 142, and a magnetic conduction plate 140 arranged on the inner side of the inner shell 141, the magnetic conduction plate 140 is arranged between the electromagnetic system 3 and the movable contact bridge 120, and the side surface of the second sealing element 152 is welded with the inner shell 141 or the magnetic conduction plate 140. The case 143 is a tub-shaped case made of plastic, and a mounting hole is provided at a lower portion of the case 143, and a metal bushing 145 (see fig. 44 to 45) for improving structural strength is embedded in the mounting hole.

As shown in fig. 3-4, the first embodiment of the sealing mechanism 157 corresponds to the embodiment of the contact system, in which the ceramic seat 111 is a half-box structure, the ceramic seat 111 is buckled upside down on the movable contact bridge 120 of the movable contact mechanism 12, the sealing mechanism 157 is disposed between the ceramic seat 111 and the magnetic conductive plate 140 of the housing assembly, a sealed space is formed between the ceramic seat 111 and the magnetic conductive plate 140, the electromagnetic system 3 is disposed below the sealed space, and the arc extinguishing mechanism is not provided in this embodiment.

The first sealing element 151 and the second sealing element 152 of the sealing mechanism 157 are both in a flat annular structure, the middle sealing element 153 is in a cylindrical structure, the edge of the inner ring of the first sealing element 151 is sleeved around the main shaft 121 of the movable contact mechanism 12, one side of the edge of the outer ring of the first sealing element 151 is connected with the second sealing element 152 through the middle sealing element 153, and the other side of the edge of the outer ring of the first sealing element 151 is welded with the ceramic base 111.

Further, the cross section of one side of the sealing mechanism 157 is in a zigzag shape, the second sealing element 152 is arranged at one side of the first sealing element 151 in parallel, the radius of the inner ring of the second sealing element 152 is larger than that of the outer ring of the first sealing element 151, the middle sealing element 153 is arranged between the second sealing element 152 and the first sealing element 151, one end of the middle sealing element 153 is connected with the inner ring edge of the second sealing element 152, and the other end of the middle sealing element 153 is connected with the outer ring edge of the first sealing element 151. Of course, the cross section of the middle sealing member 153 on the sealing mechanism 157 side may also be in an "i" shape, that is, both ends of the middle sealing member 153 are respectively connected to the side surfaces of the first sealing member 151 and the second sealing member 152, which all belong to the protection scope of the present invention.

Further, the inner annular edge of the first seal 151 is located above the lower insulating sleeve 133.

As shown in fig. 10 to 12, a second embodiment of the sealing mechanism 157 corresponds to the first embodiment of the contact system, the ceramic base 111 of the second embodiment of the contact system is a flat plate-shaped structure, the sealing mechanism 157 is disposed between the periphery of the ceramic base 111 and the inner wall of the inner casing 141, and a sealed space is formed between the ceramic base 111 and the inner casing 141 by the sealing mechanism 157, the second embodiment of the contact system is different from the first embodiment in that the ceramic base 111, the movable contact mechanism 12 and the electromagnetic system 3 are disposed inside the inner casing 141 of the housing assembly, and an arc extinguishing mechanism for extinguishing an arc is disposed in the inner casing 141.

The first sealing element 151 and the second sealing element 152 of the sealing mechanism 157 are both cylindrical structures, the first sealing element 151 is coaxially arranged on the inner side of an inner ring of the second sealing element 152, the middle sealing element 153 is connected between the first sealing element 151 and the second sealing element 152 in an annular structure, the inner side wall of the first sealing element 151 is welded with the ceramic seat 111, and the outer side wall of the second sealing element 152 is welded with the edge of an opening of the inner shell 141.

Further, an insulating filler is disposed between the first sealing member 151 and the second sealing member 152.

Further, a third sealing element 154 in an annular structure is further included, an inner annular edge of the third sealing element 154 is connected with the top end of the second sealing element 152 to form an "L" shaped structure and is sleeved on the opening edge of the inner shell 141, the second sealing element 152 is welded with the inner side wall of the opening edge of the inner shell 141, and/or the third sealing element 154 is welded with the top end face of the opening edge of the inner shell 141.

That is, the third sealing member 154 may be welded to the inner casing 141 instead of the second sealing member 152, and it is not necessary to weld the second sealing member 152 to the inner wall of the inner casing 141, which can reduce the difficulty of welding. Of course, both the second sealing member 152 and the third sealing member 154 may be welded to the inner casing 141, or the third sealing member 154 may not be provided and only the second sealing member 152 is welded to the inner casing 141. In addition, the sealing mechanism 157 can effectively improve the sealing performance by the L-shaped structure and the sealing mechanism is sleeved on the opening edge of the inner shell 141.

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 sealing element 151 and the second sealing element 152 is located above the middle sealing element 153, the middle sealing element 153 is connected between the bottom ends of the first sealing element 151 and the second sealing element 152, preferably, the top end of the second sealing element 152 is higher than the top end of the first sealing element 151, the top of the inner wall of the inner shell 141 is provided with an annular outer limit sink groove 155, the bottom of the outer wall of the ceramic base 111 is provided with an annular inner limit sink groove 156, the cross sections of the outer limit sink groove 155 and the inner limit sink groove 156 are both in an L shape, the outer limit sink groove 155 is used for accommodating the second sealing element 152, the bottom wall of the outer limit sink groove 155 is in limit fit with the vertex angle of the connection between the second sealing element 152 and the middle sealing element 153, the top wall of the inner limit sink groove 156 is in limit fit with the end surface of, the side walls of the inner limit sinker 156 are welded to the annular wall of the inner ring of the first seal 151. Through outer spacing heavy groove 155 and interior spacing heavy groove 156 respectively with first sealing member 151 and the cooperation of second sealing member 152, not only can play the effect that holds, compact circuit breaker's structure, but also can play spacing effect, the degree of difficulty when effectively reducing assembly and welding. Of course, the middle sealing element 153 may also be connected between the middle portions of the first sealing element 151 and the second sealing element 152, that is, the cross section of one side of the sealing mechanism 157 is in an "i" shape, and at this time, the insulating filler between the first sealing element 151 and the second sealing element 152 is located on both sides of the middle sealing element 153, which all belong to the protection scope of the present invention.

Further, as shown in fig. 10, the housing assembly further includes an inner cover 142 engaged with the top side of the ceramic base 111, the inner cover 142 is provided with an inner cover avoiding hole 1420 for avoiding the stationary contact 110, and the third sealing member 154 is disposed between the top end surface of the opening edge of the inner housing 141 and the inner cover 142.

As shown in fig. 3, the ceramic holder 111 is preferably made of alumina ceramic, and the ceramic holder 111 is opened with a plurality of through holes for receiving the exhaust pipe 1111 and the control terminal 1112, respectively, and the exhaust pipe 1111 and the control terminal 1112 are welded to the ceramic holder 111, respectively.

During assembly, the electromagnetic system 3, the movable contact mechanism 12, the arc extinguishing mechanism, the circuit module 5 and the static contact mechanism 11 are firstly installed in the inner shell 141, then the sealing mechanism 157 is respectively welded with the inner shell 141 and the ceramic base 111 in a laser mode, then the inner cover 142 is installed on the inner shell 141 and is installed in the outer shell 143 together after exhausting gas and injecting hydrogen or nitrogen-hydrogen mixed gas through the exhaust pipe 1111 and then sealing is conducted, and finally insulating resin is poured into the outer shell 143 and is solidified.

As shown in fig. 3 to 4, the static contact 110 is an embodiment of the static contact, the sealing performance of the invention is improved by the improvement on the structure of the static contact 110, and the structure of the static contact 110 in the two embodiments of the contact system is the same.

The static contact 110 is of a cylindrical structure, the static contact 110 comprises a middle column 113 arranged on one side of the ceramic base 111, and a contact column 114 and a connecting column 115 which are axially and respectively arranged on two sides of the middle column 113, the contact column 114 penetrates through the contact through hole 112 and extends to the other side of the ceramic base 111, a cylindrical mounting cylinder 116 is arranged on one side of the middle column 113 close to the contact column 114, the mounting cylinder 116 surrounds the periphery of the contact column 114, the end part of the mounting cylinder 116 far away from the middle column 113 is welded with the ceramic base 111, an insulating filler is arranged between the mounting cylinder 116 and the contact column 114, and a gap between the mounting cylinder 116 and the contact column 114 is filled.

Further, the mounting cylinder 116 is provided with an extension ring 117 at an end away from the middle column 113, a side surface of the extension ring 117 is welded with the ceramic seat 111, and the thickness of the extension ring 117 is greater than that of the mounting cylinder 116. The thickness of the end of the mounting cylinder 116 away from the middle column 113 is increased by the extension ring 117, so that the contact area with the ceramic seat 111 is further increased, not only is welding convenient, but also the sealing effect of the welding is more reliable.

As shown in fig. 13-14, the high-voltage direct-current relay further includes an auxiliary contact system cooperating with the contact system, and the insulating mechanism is provided with a shift lever cooperating with the auxiliary contact system, and the contact system drives the auxiliary contact system to operate together through the shift lever when operating. The auxiliary contact system comprises at least one auxiliary contact mechanism 6a arranged on one side of the movable contact mechanism 12, each auxiliary contact mechanism comprises a shifting rod 61 and at least two reeds matched with each other, the circuit module 5 is provided with an indicating loop connected with the at least two reeds, one end of the shifting rod 61 is connected with the movable contact mechanism 12, the other end of the shifting rod 61 is matched with the at least one reed, and when the movable contact mechanism 12 acts, the shifting rod 61 drives the at least one reed to contact or separate the two reeds so as to connect or disconnect the indicating loop.

The utility model discloses a contact system is assisted to high-voltage direct current relay, the operating condition who moves contact mechanism 12 is instructed through the cooperation of reed and driving lever 61, and not only simple structure, with low costs, assembly are simple, direct moreover with move contact mechanism 12 cooperation, sensitivity is high, the reliability is high.

Further, the auxiliary contact system includes two auxiliary contact mechanisms 6a, and the two auxiliary contact mechanisms 6a are oppositely disposed at both sides of the movable contact bridge 120 in the width direction of the movable contact bridge 120.

Further, 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 is matched with the electromagnetic system 3, the other end of the main shaft 121 is matched with the movable contact bridge 120, the electromagnetic system 3 can drive the main shaft 121 to drive the movable contact bridge 120 to contact with or separate from the fixed contact 110, and the shift lever 61 is connected with the insulating mechanism. Of course, the shift lever 61 may also be connected to the main shaft 121 or the movable contact bridge 120, which all belong to the protection scope of the present invention. However, the driving lever 61 is connected with the insulating mechanism, so that the structure is simpler, and the electrical safety is more reliable.

Further, the insulating mechanism includes a middle edge sleeve 131 with a hollow structure, and an upper insulating sleeve 132 and a lower insulating sleeve 133 respectively disposed at two ends of the middle insulating sleeve 131, the middle insulating sleeve 131 is disposed between an outer side of the main shaft 121 and an inner side of a main shaft hole of the movable contact bridge 120, the upper insulating sleeve 132 is located at a side of the movable contact bridge 120 close to the stationary contact 110, and the shift lever 61 is connected to the upper insulating sleeve 132. Of course, the shift lever 61 may also be connected to the middle insulating sleeve 131 or the lower insulating sleeve 133 of the insulating mechanism.

As shown in fig. 2, 6, 11, and 23, the electromagnetic system 3 includes a coil bobbin 31 and a start coil 32 wound around the coil bobbin 31, a movable iron core 123 extending to the inside of the coil bobbin 31 and matching with the start coil 32 is disposed on the main shaft 121, when the start coil 32 is energized, a magnetic field is formed to drive the movable iron core 123, and then the movable iron core 123 drives the movable contact bridge 120 on the main shaft 121 to contact with or separate from the stationary contact 110.

Further, a holding coil 33 connected in series with the starting coil 32 is further arranged on the outer side of the coil framework 31, the holding coil 33 and the starting coil 32 are connected in series and then connected with a voltage stabilizing circuit, the resistance of the holding coil 33 is greater than that of the starting coil 32, the power of the holding coil 33 is smaller than that of the starting coil 32, two ends of the holding coil 33 are respectively connected with at least two reeds of the auxiliary contact mechanism 6a, when the electromagnetic system 3 is powered on, the starting coil 32 drives the movable contact mechanism 12 to drive the movable contact bridge 120 to move, and meanwhile, 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 movable contact mechanism 12 separates the two reeds, connecting the start coil 32 and the hold coil 33 in series.

Fig. 13-17 and 19-23 show two embodiments of the auxiliary contact mechanism 6a, respectively.

Referring to fig. 13 to 16, an embodiment of the auxiliary contact mechanism 6a is shown, in which the auxiliary contact mechanism 6a of the embodiment includes two spring pieces, namely a static spring piece 631 and a movable spring piece 632, which are respectively connected to the circuit module 5.

The length of movable spring piece 632 is greater than static spring piece 631, the end of static spring piece 631 close to shift lever 61 is spaced from shift lever 61, the end of movable spring piece 632 close to shift lever 61 extends out of the end of static spring piece 631 and extends to one side of shift lever 61 for cooperation, and shift lever 61 pushes the part of movable spring piece 632 extending out of static spring piece 631 when moving, so that movable spring piece 632 is in contact with or separated from static spring piece 631.

The stationary spring 631 and the movable spring 632 are respectively provided with a contact, and the stationary spring 631 and the movable spring 632 of this embodiment form a normally closed contact structure, that is, the contacts of the stationary spring 631 and the movable spring 632 are in contact with each other in a normal state, so that the indication circuit is kept on, and when the movable contact mechanism 12 acts, the movable spring 632 and the contact on the stationary spring 631 are driven by the shift lever 61 to be separated from each other, so that the indication circuit is disconnected and outputs a signal. Of course, the stationary spring piece 631 and the movable spring piece 632 may also be normally open contacts, and they are kept separated in a normal state, and the moving lever 61 brings the contacts on the stationary spring piece 631 and the movable spring piece 632 into contact with each other when it is actuated. The auxiliary contact mechanism 6a of the present embodiment has the characteristics of simple structure, low cost and reliable operation, and in the present embodiment, the auxiliary contact system includes two auxiliary contact mechanisms 6a, including two sets of stationary spring pieces 631 and movable spring pieces 632.

Fig. 24 shows a manner of matching the auxiliary contact system of the present embodiment with the electromagnetic system 3, which includes two auxiliary contact mechanisms 6a, wherein two reeds of one auxiliary contact mechanism 6a are connected to an indication circuit of the circuit module 5 for indicating an operating state, the other auxiliary contact mechanism 6a is a second auxiliary contact mechanism 6b, and the second auxiliary contact mechanism 6b and the auxiliary contact mechanism 6a have the same structure, and two reeds of the second auxiliary contact mechanism 6b are respectively connected to two ends of the holding coil 33 of the electromagnetic system 3 for short-circuiting the holding coil 33 when the electromagnetic system 3 is powered on.

The static reed 631 and the movable reed 632 of the second auxiliary contact mechanism 6b are respectively connected with two ends of the holding coil 33, when the starting coil 32 is powered off, the movable reed 632 is in contact with the static reed 631 and short-circuits the holding coil 33, when the electromagnetic system 3 is powered on, the starting coil 32 drives the main shaft 121 to drive the movable contact mechanism 12 to act, the movable contact mechanism 12 drives the shift lever 61 to push the movable reed 632 to move away from the static reed 631, and after the electromagnetic system 3 is powered on, the movable reed 632 is separated from the static reed 631.

As shown in fig. 13 to 16, the movable springs 632 of the second auxiliary contact mechanism 6b and the auxiliary contact mechanism 6a are respectively disposed on two sides of the respective shift lever 61 along the moving direction of the movable contact mechanism 12, forming a mechanical interlocking structure.

The shift lever 61 of the auxiliary contact mechanism 6a and the shift lever 61 of the second auxiliary contact mechanism 6b are disposed at the same height, and the movable contact mechanism 12 can drive the shift lever 61 of the auxiliary contact mechanism 6a and the shift lever 61 of the second auxiliary contact mechanism 6b to move simultaneously, the static reed 631 and the movable reed 632 of the auxiliary contact mechanism 6a contact each other, and the static reed 631 and the movable reed 632 of the second auxiliary contact mechanism 6b also contact each other, so that when the movable contact mechanism 12 moves to one side, the shift lever 61 of one of the second auxiliary contact mechanism 6b and the auxiliary contact mechanism 6a can push the corresponding movable reed 632 to separate from the static reed 631, and the shift lever 61 of the other can be away from the corresponding movable reed 632, so that the movable reed 632 contacts with the static reed 631.

Referring to fig. 13-14, which show the state when the starting coil 32 is powered off, the movable contact mechanism 12, driven by the return spring 127, drives the shift lever 61 of the auxiliary contact mechanism 6a and the shift lever 61 of the second auxiliary contact mechanism 6b to move away from the fixed contact 110, so that the shift lever 61 of the auxiliary contact mechanism 6a pushes the movable contact spring 632 of the auxiliary contact mechanism 6a to separate from the stationary contact spring 631 of the auxiliary contact mechanism 6a, and the indicating circuit is disconnected, and simultaneously, the shift lever 61 of the second auxiliary contact mechanism 6b is away from the movable contact spring 632 of the second auxiliary contact mechanism 6b, so that the movable contact spring 632 of the second auxiliary contact mechanism 6b contacts with the stationary contact spring 631 of the second auxiliary contact mechanism 6b, and the holding coil 33 is short-circuited;

referring to fig. 15-16, which show the state of the electromagnetic system 3 when it is powered on, the moving contact mechanism 12 drives the shift lever 61 of the auxiliary contact mechanism 6a and the shift lever 61 of the second auxiliary contact mechanism 6b to move toward the direction approaching the fixed contact 110 under the driving of the start coil 32, so that the shift lever 61 of the second auxiliary contact mechanism 6b pushes the moving reed 632 of the second auxiliary contact mechanism 6b to separate from the static reed 631 of the second auxiliary contact mechanism 6b, the holding coil 33 is connected in series with the start coil 32, and the shift lever 61 of the auxiliary contact mechanism 6a is away from the moving reed 632 of the auxiliary contact mechanism 6a, so that the moving reed 632 of the auxiliary contact mechanism 6a contacts with the static reed 631 of the auxiliary contact mechanism 6a, and the indicating circuit is turned on.

Fig. 18 to 22 show a second embodiment of the auxiliary contact system, and the auxiliary contact mechanism 6a of this embodiment includes three spring plates, namely an upper spring plate 641, a lower spring plate 642 and a middle spring plate 643, which are respectively connected to the circuit module 5.

The upper spring 641 and the lower spring 642 are oppositely arranged and are respectively located at two sides of one end of the middle spring 643, the other end of the middle spring 643 is connected with the circuit module 5, the middle part of the middle spring 643 is matched with the shift lever 61, and the shift lever 61 pushes the middle part of the middle spring 643 when moving, so that the middle spring 643 is contacted with the upper spring 641 or the lower spring 642.

In this embodiment, contacts are respectively disposed on two sides of spring 643, contacts are also respectively disposed on the sides of upper spring 641 and lower spring 642 that are close to each other, upper spring 641, lower spring 642 and middle spring 643 constitute a switch structure, the contacts of middle spring 643 and the contacts of lower spring 642 are in contact in a normal state, so that middle spring 643 and lower spring 642 constitute a normally closed contact structure, and middle spring 643 and upper spring 641 constitute a normally open contact structure;

when the moving contact mechanism 12 moves the shift lever 61, the middle spring 643 is pushed to move toward the upper spring 641, and the contacts on the middle spring 643 are separated from the contacts on the lower spring 642 and then contact the contacts on the upper spring 641.

The auxiliary contact mechanism 6a of the embodiment has a more reliable structure, has higher sensitivity and more efficient feedback due to the characteristic of existence or nonexistence, and can meet more complex requirements on the indication of the working state of the high-voltage direct-current relay.

Referring to fig. 25, the auxiliary contact system of the present embodiment is matched with the electromagnetic system 3, and includes an auxiliary contact mechanism 6a, one end of a middle spring 643 is connected with one end of the holding coil 33, the other end of the middle spring 643 is matched with one ends of an upper spring 641 and a lower spring 642, the other end of the lower spring 642 is connected with the other end of the holding coil 33 of the electromagnetic system 3, and the other end of the upper spring 641 is connected with the indicating circuit of the circuit module 5.

Referring to fig. 18-19, which show the state when the starting coil 32 is deenergized, the movable contact mechanism 12 drives the shift lever 61 of the auxiliary contact mechanism 6a to move away from the fixed contact 110 under the driving of the return spring 127, and the shift lever 61 of the auxiliary contact mechanism 6a pushes the middle reed 643 to move toward the lower reed 642, so that the middle reed 643 and the upper reed 641 are separated, the indicating circuit is disconnected, and when the middle reed 643 and the lower reed 642 are in contact, the holding coil 33 is short-circuited;

referring to fig. 20-21, which show the state of the electromagnetic system 3 when it is powered on, the movable contact mechanism 12 drives the shift lever 61 of the auxiliary contact mechanism 6a to move toward the stationary contact 110 under the driving of the start coil 32, the middle spring 643 moves toward the upper spring 642, the shift lever 61 of the auxiliary contact mechanism 6a pushes the middle spring 643 and the lower spring 642 to separate, the holding coil 33 is connected in series with the start coil 32, and the indicating circuit is turned on when the middle spring 643 and the upper spring 642 contact.

As shown in fig. 26, an auxiliary mounting mechanism for mounting an auxiliary contact system is disposed on the coil bobbin 31, an auxiliary mounting notch 620 (fig. 8) for avoiding the auxiliary mounting mechanism is disposed 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 disposed on the socket 314, and the plurality of connecting pieces 317 are respectively connected between the circuit module 5 and the electromagnetic system 3.

Specifically, the bobbin 31 includes two upper side plates 311 and lower side plates 312 which are arranged oppositely, and a bobbin 313 connected between the upper side plates 311 and the lower side plates 312, a start coil 32 and a holding coil 33 which are wound outside the bobbin 313 are arranged between the upper side plates 311 and the lower side plates 312, the socket 314 includes two mounting bars 3141 which are arranged oppositely, the two mounting bars 3141 are respectively connected with the upper side plates 311 vertically, the circuit module 5 is installed between the two mounting bars 3141, the inner sides of the two mounting bars 3141 are respectively provided with a slot 316, and the side edges of the two sides of the circuit module 5 are respectively limited with the slots 316 of the two sides.

Further, the edge of the upper side plate 311 is provided with a connecting seat 315 for mounting a connecting piece 317, the middle part of the connecting piece 317 penetrates 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 outer sides of the starting coil 32 and the holding coil 33.

Furthermore, three connecting pieces 317 are arranged on the connecting base 315, and the three connecting chains 317 are arranged in parallel, wherein two connecting pieces 317 on the outermost side are respectively connected with the tail end of the starting coil 32 and the start end of the holding coil 33, and the connecting piece 317 arranged in the middle is connected with the tail end of the starting coil 32 and the start end of the holding coil 33.

As shown in fig. 27-29, 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 movable contact bridge 120, and two sets of magnetic field mechanisms respectively engaged with two ends of the movable contact bridge 120, each set of magnetic field mechanism includes at least two magnetic field assemblies 72 oppositely disposed on two sides of the movable contact bridge 120 along the width direction of the movable contact bridge 120, and the magnetic field assemblies 72 disposed on two sides of the movable contact bridge 120 in each set of magnetic field mechanism have opposite polarities, so that the magnetic field mechanism generates a constant magnetic field vertically penetrating through the current direction in the movable contact bridge 120, at least one side of the middle portion of the movable contact bridge 120 is provided with an auxiliary contact mechanism 6a, the auxiliary contact mechanism 6a includes a shift lever 61 connected (indirectly connected) to the middle portion of the movable contact bridge 120 and at least two reeds engaged with each other, and at least two reeds are respectively connected to the circuit module 5, the circuit module 5 is, an auxiliary chamber 630 for accommodating the reeds of the auxiliary contact mechanism 6a is formed between the two sides of the two sets of magnetic field mechanisms, a deflector rod channel 610 for avoiding the deflector rod 61 is arranged in the middle of the side wall of the arc-extinguishing chamber 71, and the deflector rod channel 610 is connected between the inner side of the arc-extinguishing chamber 71 and the auxiliary chamber 630.

The utility model discloses a high voltage direct current relay's arc extinguishing mechanism not only can with the cooperation of auxiliary contact mechanism 6a, compact structure reduces the volume, has the strong characteristics of arc extinguishing ability moreover.

The arc extinguishing mechanism further comprises a plurality of fixing mechanisms 73 respectively used for limiting the magnetic field assembly 72, two fixing mechanisms 73 on the same side are arranged at intervals and form an auxiliary chamber 630, and an arc extinguishing buckle 74 is arranged on the side face, far away from the arc extinguishing cover 71, of each fixing mechanism 73 (see fig. 31).

As shown in fig. 26, 28, and 31, an auxiliary mounting mechanism for mounting the auxiliary contact mechanism 6a is disposed on the coil bobbin 31 of the electromagnetic system 3, an auxiliary mounting notch 620 for avoiding the auxiliary mounting mechanism is disposed on the magnetic conductive plate 140 of the housing assembly, the auxiliary mounting mechanism includes a socket 314, a slot 316 for limiting the circuit module 5 is disposed on the socket 314, and an arc extinguishing clamping slot 740, which is in spacing fit with the arc extinguishing buckle 74, is disposed on a side of the slot 316 close to the arc extinguishing chamber 71. Of course, arc chute 74 may also be connected to housing assembly or magnetic plate 140.

As shown in fig. 31-32, the arc extinguishing mechanism includes two sets of magnetic field mechanisms oppositely disposed along the length direction of the moving contact bridge 120, each set of magnetic field mechanism includes two sets of magnetic field assemblies 72 oppositely disposed along the width direction of the moving contact bridge 120, and the arc extinguishing mechanism includes four fixing mechanisms 73 respectively used for fixing the magnetic field assemblies 72.

The magnetic field assembly 72 comprises a magnet 721 and a magnetic conducting iron 722 which are arranged in parallel, the fixing mechanism 73 comprises a side plate 731 and a short plate 733 which are arranged oppositely, and a transverse plate 732 which is vertically arranged on one side of the side plate 731 and the short plate 733, one end of the side plate 731 and one end of the short plate 733 are respectively connected with the arc-extinguishing chamber 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 with one end of the transverse plate 732 to form an L-shaped structure, the other end of the short plate 733 and the transverse plate 732 are arranged at intervals to form a abdicating groove 734, the length of the magnetic conducting iron 722 is greater than that of the magnet 721, the shell assembly comprises an inner shell 141 surrounding the arc-extinguishing chamber 71, the magnetic conducting iron 722 is arranged on one side of the magnet 721 far away from the arc-extinguishing chamber 71, one end of the magnetic conducting iron 722 is. The magnetic iron 722 can extend out of the fixing mechanism 73 through the abdicating slot 734, so that the magnet 721, the magnetic iron 722 and the inner shell 141 can form a magnetic loop, generate a stronger magnetic field, extinguish the arc more quickly, and have simple structure and small volume.

Further, the side plates 731 of the two fixing mechanisms 73 disposed on the same side of the arc chute 71 are disposed opposite to each other, and an auxiliary chamber 630 for accommodating the reed of the auxiliary contact mechanism 6a is formed between the side plates 731 of the two fixing mechanisms 73.

Further, the bottoms of the two fixing mechanisms 73 arranged on the same side of the arc extinguishing cover 71 are connected through a connecting plate 735, the arc extinguishing buckle 74 comprises an arc extinguishing clamping plate 741 and an arc extinguishing claw 742, the arc extinguishing clamping plate 741 is in a U-shaped structure, an opening of the arc extinguishing clamping plate 741 faces the fixed contact 110, one side of the arc extinguishing clamping plate 741 is connected with 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 outwards to form the arc extinguishing claw 742.

Further, a plurality of arc extinguishing through holes 75 are respectively formed in two opposite side surfaces of the arc extinguishing cover 71 along the length direction of the movable contact bridge 120, the arc extinguishing through holes 75 arranged on the same side surface are arranged side by side along the height direction of the arc extinguishing cover 71 at intervals, and an arc extinguishing grid 76 is formed between two adjacent arc extinguishing through holes 75.

Further, arc extinguishing slopes 77 are respectively disposed on two sides of each arc extinguishing bar 76, and a distance between two adjacent arc extinguishing bars 76 gradually increases along a direction away from the movable contact bridge 120, that is, an inner diameter of the arc extinguishing through hole 75 in the height direction gradually increases along a direction away from the movable contact bridge 120.

Further, the included angle of the arc extinguishing inclined surfaces 77 of the two adjacent arc extinguishing grids 76 ranges from 7 degrees to 17 degrees.

Further, the arc extinguishing chamber 71 is made of engineering plastics or ceramics with good insulating property 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 iron 722 and the inner shell 141 are made of iron or iron alloy with good magnetic conductivity.

The holding coil 33 is short-circuited when the magnetic system 3 is powered on, and after the magnetic system 3 is powered on, the short circuit of the holding coil 33 is removed, so that the starting coil 32 and the holding coil 33 are connected in series, an external control power supply input is processed, and the voltage is stabilized at a certain fixed value after being reduced, thereby playing a role in reducing power consumption.

The electromagnetic system 3 comprises a starting coil 32 and a holding coil 33 which are connected in series, the starting coil 32 and the holding coil 33 are connected in series and then are connected with a 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 comprises a first controllable element and an RC delay circuit, the first controllable element is connected to two ends of the holding coil 33 in parallel, the RC delay circuit is connected with the control end of the first controllable element, the voltage change is rapid when the electromagnetic system 3 is powered on, the RC delay circuit conducts the first controllable element, 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 movable iron core to drive the main shaft 121; 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 is connected with the starting coil 32 in series.

The utility model discloses a high voltage direct current relay's control circuit adopts mechatronic technique, removes the short circuit to holding coil 33 through a control circuit time delay, makes the switching of 3 powers of electromagnetic system need not the mechanical structure of linkage main circuit, needn't encapsulate circuit module 5 to the arc extinguishing mechanism in, has ensured the purity of arc extinguishing mechanism, and the structure is also greatly simplified simultaneously, has ensured the reliability of product. In addition, even if the circuit module 5 is packaged into the arc extinguishing mechanism, the assembly efficiency is superior to that of a mechanical linkage type double-coil structure due to the simple structure and the good controllability of the circuit module.

As shown in fig. 39-40, the overall resistance is increased after the start coil 32 and the hold coil 33 are connected in series, and the overall power is reduced because the voltage is unchanged and the current is reduced, thereby having the characteristics of energy saving, environmental protection and reduction of part loss.

Fig. 36 shows a first embodiment of the first controllable element, which is an intermediate relay a, the intermediate relay a includes a first movable contact and a first fixed contact connected in parallel at two ends of a holding coil 33, a coil of the intermediate relay a is connected with a delay circuit, the first movable contact is in contact with the first fixed contact to break the holding coil 33, the coil of the intermediate relay a is energized to drive the first movable contact to separate from the first fixed contact, so that the holding coil 33 is connected in series with an actuating coil 32.

When the electromagnetic system 3 is electrified, the time delay circuit does not act, the normally closed contact of the intermediate relay A is kept closed, and the holding coil 33 is in short circuit; after the electromagnetic system 3 is powered on, the time delay circuit drives the intermediate relay a to act, so that the normally closed contact of the intermediate relay a is disconnected, and the starting coil 32 is connected with the holding coil 33 in series.

Fig. 37 shows a second embodiment of the first controllable element, which is an intermediate relay B that includes an intermediate movable contact connected between one end of the holding coil 33 and one end of the starting coil 32, a normally closed stationary contact connected to the other end of the holding coil 33, and a normally open stationary contact connected to the other end of the starting coil 32, the coil of the intermediate relay B being connected to the delay circuit.

When the electromagnetic system 3 is electrified, the time delay circuit does not act, and the holding coil 33 is in short circuit when the middle movable contact of the middle relay B is in contact with the normally closed static contact; after the electromagnetic system 3 is powered on, the time delay circuit drives the intermediate relay B to act, so that an intermediate movable contact of the intermediate relay B is separated from a normally closed stationary contact and is in contact with a normally open stationary contact, the intermediate movable contact is in contact with the normally open stationary contact to short circuit the starting coil 32, and the intermediate movable contact is separated from the normally closed stationary contact to enable the holding coil 33 to be connected with a power supply. The embodiment has the characteristics that the holding coil 33 replaces the starting coil 32 to work after being electrified, but the holding coil and the starting coil are not connected in series to work, so that the effects of energy conservation and environmental protection are better.

As shown in fig. 35 and 38, the third embodiment of the first controllable element is a MOS transistor Q1, two ends of the MOS transistor Q1 are connected in parallel to two ends of the holding coil 33, and the control end of the MOS transistor Q1 is connected to the RC delay circuit.

Further, the RC delay circuit includes a capacitor C1 and a resistor R3, one end of the capacitor C1 and one end of 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 the capacitor C2 and the negative electrode of the power supply, the other end of the capacitor C1 is respectively connected to one end of the resistor R2 and the positive electrode of the diode D2, the negative electrode 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 electrode of the power supply, and the diode D2 is used for ensuring the polarity of the circuit current.

When the electromagnetic system 3 is powered on, the capacitor C1 is charged, the voltage at two ends of the capacitor C1 changes rapidly, the current passing through the capacitor C1 is large due to the low capacitive reactance of the capacitor C1, the capacitor C1 drives the control end of the MOS transistor Q1 to conduct the MOS transistor Q1 and short-circuit the holding coil 33, and when the holding coil 33 is short-circuited, the current passing through the starting coil 32 flows to the MOS transistor Q1, so that the starting coil 32 can work in a high-power state to drive the movable iron core to drive the main shaft 121 and the movable contact bridge 120 to act; after the electromagnetic system 3 is powered on, the capacitor C1 is fully charged, the voltage change at the two ends of the capacitor C1 is slow, the capacitive reactance of the capacitor C1 is increased, so that the current passing through the capacitor C1 is small, the capacitor C1 cannot drive the control end of the MOS transistor Q1 to turn on the MOS transistor Q1, the MOS transistor Q1 is turned off, the current originally flowing to the MOS transistor Q2 flows to the holding coil 33, and the start-up coil 32 is connected in series with the holding coil 33.

Further, the RC delay circuit comprises a plurality of capacitors C1, and a plurality of capacitors C1 are arranged in parallel. The effect of adjusting the delay period is realized by changing the number of the capacitors C1, and of course, the effect of adjusting the delay period can also be realized by changing the specification of the capacitor C1.

Further, the RC delay circuit includes a plurality of resistors R2 and a plurality of resistors R3. When the direct specification is not in accordance with the requirement, a plurality of resistors R2 and a plurality of resistors R3 are required to be connected in series and in parallel according to the requirement to obtain a resistance value in accordance with the requirement, and the resistor R3 divides the voltage to ensure the gate-level voltage of the MOS transistor Q1, so when the delay parameter is adjusted, the resistor R2 adjusts the resistance value according to calculation, the resistor R3 is adjusted in the same proportion, the effect of adjusting the delay period is realized by changing the number of the resistors R2 or R3, and of course, the effect of adjusting the delay period can also be realized by changing the specification of the resistor R2 or the resistor R3.

Further, the voltage stabilizing circuit comprises an MOS tube Q2 connected with the start coil 32 and the holding coil 33 in series, and a voltage stabilizing tube VR1 and a resistor R1 which are respectively connected with the control end of the MOS tube Q2, wherein the other ends of the voltage stabilizing tube VR1 and the resistor R1 are respectively connected with a power supply.

Further, the voltage stabilizing circuit also comprises a voltage dependent resistor RY1 connected with the voltage stabilizing tube VR1 and the resistor R1 in parallel. The voltage dependent resistor RY1 is used for eliminating overvoltage of absorption power supply and plays a role of protection.

Further, the voltage stabilizing circuit further comprises a diode D1, the anode of the diode D1 is connected with the anode of the power supply, and the cathode of the diode D1 is connected with one end of the resistor R1 and one end of the MOS transistor Q2 respectively. The diode D1 can ensure the polarity of the current in the circuit and improve the reliability of the circuit.

Further, the voltage stabilizing circuit comprises a plurality of voltage stabilizing tubes which are connected in series, as shown in fig. 42, the voltage stabilizing circuit comprises two voltage stabilizing tubes which are a voltage stabilizing tube VR1 and a voltage stabilizing tube VR2, and the voltage stabilizing tube VR1 and the voltage stabilizing tube VR2 are connected in series.

As shown in fig. 41 to 43, the circuit module 5 includes a second control circuit, and the second control circuit is different from the first control circuit in that the second control circuit is connected to the starting coil 32 for reducing the operating voltage of the starting coil 32, so as to achieve the effects of energy saving and environmental protection. The second control circuit can be matched with the first control circuit for use, and on the basis that the first control circuit inputs an external control power supply and performs voltage reduction processing, the second control circuit reduces the output voltage again after delaying, and the purposes of high-power pull-in and low-power keeping are achieved. Of course, the first control circuit may not be provided, and the voltage reduction processing is performed only by the second control circuit, which all belong to the protection scope of the present invention.

As shown in fig. 42, the second control circuit includes a second voltage stabilizing circuit and a time-delay voltage-reducing circuit, an input end of the second voltage stabilizing circuit is connected to the power supply, an output end of the second voltage stabilizing circuit is connected to the start coil 32 to supply power to the start coil 32, the second voltage stabilizing circuit includes at least two voltage-stabilizing tubes connected in series, the time-delay voltage-reducing circuit includes a second controllable element connected in parallel to two ends of at least one voltage-stabilizing tube, and a control end of the second controllable element is connected to the second voltage stabilizing circuit through a capacitor C10.

When the electromagnetic system 3 is powered on, the capacitor C10 is charged, the second controllable element is turned off, and rated working voltage is output to the starting coil 32 through a plurality of voltage-stabilizing tubes connected in series; after the electromagnetic system 3 is powered on, the capacitor C10 is fully charged, the second controllable element is conducted, at least one voltage regulator tube connected with the second controllable element in parallel is short-circuited, and rated working voltage is output for the starting coil 32 through other voltage regulator tubes in the second voltage regulator circuit.

The utility model discloses a high voltage direct current relay's control circuit adopts mechatronic technique, through second control circuit time delay step-down processing, makes the switching of 3 powers of electromagnetic system need not the mechanical structure of linkage main circuit, needn't encapsulate circuit module 5 to the arc extinguishing mechanism in, has ensured the purity of arc extinguishing mechanism, and the structure is also greatly simplified simultaneously, has ensured the reliability of product. In addition, even if the circuit module 5 is packaged into the arc extinguishing mechanism, the assembly efficiency is superior to that of a mechanical linkage type double-coil structure due to the simple structure and the good controllability of the circuit module.

Further, the second controllable element is a triode, a thyristor or an MOS tube.

Further, the second voltage stabilizing circuit comprises an MOS tube Q10, a resistor R10 and two voltage stabilizing tubes, the two voltage stabilizing tubes are a voltage stabilizing tube VR10 and a voltage stabilizing tube VR20 respectively, one end of the MOS tube Q10 and one end of the resistor R10 are connected with the input end of the second voltage stabilizing circuit respectively, the other end of the MOS tube Q10 is connected with the output end of the second voltage stabilizing circuit, the control end of the MOS tube Q10 is connected with the other end of the resistor R10 and one end of the voltage stabilizing tube VR10 respectively, the other end of the voltage stabilizing tube VR10 is connected with the output end of the second voltage stabilizing circuit through a voltage stabilizing tube VR20, and the collector and the emitter of a triode Q20 of the time-delay voltage reducing circuit are connected at two ends of the voltage.

Further, the second voltage stabilizing circuit also comprises a voltage dependent resistor RY10 which is connected with the voltage stabilizing tube VR10, the voltage stabilizing tube VR20 and the resistor R10 in parallel. The voltage dependent resistor RY10 is used for eliminating overvoltage of absorption power supply and plays a role of protection.

Further, the second voltage stabilizing circuit further comprises a diode D10, the anode of the diode D10 is connected with the input end of the second voltage stabilizing circuit, and the cathode of the diode D10 is connected with one end of the resistor R10 and one end of the MOS transistor Q20 respectively. The diode D10 can ensure the polarity of the current in the circuit and improve the reliability of the circuit.

As a preferred embodiment of the second controllable element, the second controllable element is a transistor Q20, a collector and an emitter of the transistor Q20 are connected in parallel to two ends of at least one voltage regulator tube in the second voltage regulator circuit, and a base of the transistor Q20 is connected with the 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 conducted, and a voltage regulator tube connected between the collector and the emitter of the triode is in short circuit.

Furthermore, the time-delay voltage-reducing circuit further comprises a resistor R20 and a resistor R30, one end of the resistor R20 is connected with one end of an MOS transistor Q10, the other end of the resistor R20 is respectively connected with a capacitor C10 and a base electrode of a triode Q20, and two ends of the resistor R30 are respectively connected with a collector electrode and an emitter electrode of the triode Q20.

Further, the time-delay voltage-reducing circuit further comprises a diode D20, a diode D30 and a diode D40, wherein the anode of the diode D40 is connected with the base of the triode Q20, one end of the resistor R20 and one end of the capacitor C10 respectively, the cathode of the diode D40 is connected with one end of the MOS tube Q10, the emitter of the triode Q20 is connected with the anode of the diode D20, the cathode of the diode D20 is connected with the anode of the diode D30, and the cathode of the diode D30 is connected with one end of the voltage-regulator VR 20.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (10)

1. A contact system of a direct current relay, characterized in that: the device comprises a shell assembly, a static contact mechanism (11) and a movable contact mechanism (12) which are arranged in the shell assembly, wherein the static contact mechanism (11) comprises two static contacts (110), the movable contact mechanism (12) comprises a main shaft (121), a movable contact bridge (120) and an insulation mechanism, one end of the main shaft (121) is matched with an electromagnetic system (3), the other end of the main shaft (121) is matched with the movable contact bridge (120), a main shaft hole which is sleeved on the outer side of the main shaft (121) is formed in the middle of the movable contact bridge (120), the electromagnetic system (3) can drive the main shaft (121) to drive the movable contact bridge (120) to be in contact with or separated from the static contacts (110), the insulation mechanism comprises an upper insulation sleeve (132) which is positioned on one side of the movable contact bridge (120) close to the static contacts (110), the upper insulation sleeve (132) comprises an insulation middle plate (1321) which is matched with the middle of the movable contact bridge (120) and insulation side plates (1322), and a blocking mechanism is arranged on one side of the insulating side plate (1322) close to the static contact (110).

2. The contact system of a dc relay of claim 1, wherein: the static contact mechanism (11) comprises a ceramic base (111) used for fixing the static contacts (110), one ends of the two static contacts (110) respectively penetrate through the ceramic base (111) and are respectively matched with two ends of the movable contact bridge (120), an insulating partition plate (1111) is arranged on one side, close to the movable contact bridge (120), of the ceramic base (111), and the insulating partition plate (1111) is located between the two static contacts (110).

3. The contact system of a dc relay of claim 1, wherein: go up insulating cover (132) still include to keeping away from insulating curb ear (1323) of static contact (110) one side extension, be equipped with two at least insulating curb ears (1323) on every insulating curb plate (1322), and two at least insulating curb ears (1323) set up the both sides at movable contact bridge (120) relatively along movable contact bridge (120) width direction.

4. The contact system of a dc relay according to claim 2, characterized in that: the widths of the two insulating side plates (1322) are gradually increased along the direction close to the end part of the movable contact bridge (120), the two sides of the two insulating side plates (1322) in the width direction are respectively provided with an insulating side surface which is obliquely arranged along the length direction of the movable contact bridge (120), one end of each of the two insulating side surfaces at the two sides of each insulating side plate (1322) is connected with the insulating middle plate (1321), and the other end of each of the two insulating side surfaces at the two sides of each insulating side plate (1322) is respectively connected with the side edge of the insulating side lug (1323).

5. The contact system of a dc relay of claim 1, wherein: the blocking mechanism comprises a plurality of insulating transverse ribs (1325) arranged on the top side of the insulating side plate (1322), and the length directions of the insulating transverse ribs (1325) are all perpendicular to the length direction of the movable contact bridge (120).

6. The contact system of a dc relay of claim 1, wherein: the blocking mechanism comprises an insulating baffle (1326) vertically arranged at the top side of the insulating side plate (1322).

7. The contact system of a dc relay of claim 6, wherein: the side face of the side, far away from the insulating middle plate (1321), of the insulating baffle plate (1326) is provided with a plurality of insulating longitudinal ribs (1327).

8. The contact system of a dc relay of claim 6, wherein: the length of the insulating baffle (1326) in the width direction of the movable contact bridge (120) is larger than that of the insulating side plate (1322), insulating baffle lugs (1328) extending towards two sides of the movable contact bridge (120) are respectively arranged at two ends of the insulating baffle (1326), and two insulating baffle lugs (1328) at two ends of each insulating baffle (1326) are respectively connected with the outer sides of two insulating side lugs (1323) of the insulating side plate (1322).

9. The contact system of a dc relay of claim 6, wherein: an insulating ring (1324) surrounding the periphery of the top end of the main shaft (121) is arranged on the top side of the insulating middle plate (1321), a clamping ring (136) in an annular structure is arranged in the upper insulating sinking groove (135), and the inner side of the clamping ring (136) is connected with the main shaft (121); and reinforcing ribs (1329) are respectively arranged on the top sides of the two insulating side plates (1322), one ends of the two reinforcing ribs (1329) are respectively connected with the bottoms of the side surfaces, close to the two insulating baffles (1326), of the two insulating baffle plates, and the other ends of the two reinforcing ribs (1329) are respectively connected with the two sides of the insulating ring (1324) of the insulating middle plate (1321).

10. The contact system of a dc relay of claim 1, wherein: the static contact mechanism (11) comprises a ceramic base (111) for fixing the static contacts (110), one ends of the two static contacts (110) respectively penetrate through the ceramic base (111) and are respectively matched with two ends of the movable contact bridge (120), two insulating partition plates (1111) which are oppositely arranged are arranged on one side of the ceramic base (111) close to the movable contact bridge (120), and the two insulating partition plates (1111) are positioned between the two static contacts (110); the blocking mechanism comprises two insulating baffle plates (1326) which are vertically arranged at the top sides of the insulating side plates (1322) at two sides, and the bottoms of the two insulating partition plates (1111) respectively extend to the inner sides of the two insulating baffle plates (1326).

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