A high voltage DC relay with improved sealing performance

Abstract

The present invention discloses a high-voltage DC relay with improved sealing performance, comprising a housing component, two static contacts, a moving contact piece, and an inner support cover, wherein the inner support cover is arranged in the upper part of the housing component, the two static contacts are respectively arranged on the top of the inner support cover, the moving contact piece is located in the inner support cover and cooperates with the two static contacts; the space between the housing component, the inner support cover and the two static contacts is filled with sealing glue to form a sealing layer; the outer sides of the two static contacts are respectively provided with transition layers which are closed on all sides and in contact with the sealing layer, and the thermal conductivity of the transition layer is lower than that of the static contacts. The present invention enables the transition layer to buffer the high temperature of the static contact from being transferred to the sealing layer, thereby buffering the sealing layer from being affected by the high temperature, avoiding yellowing, aging and cracking of the sealing layer, improving the temperature resistance of the relay or improving the life of the relay under the same high temperature.

Description

Technical Field

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

[0002] The high-voltage DC relay of the prior art usually adopts a sealing structure, and there are two main sealing methods, one is ceramic sealing, and the other is epoxy glue sealing. The epoxy-sealed high-voltage DC relay is to seal the two static contacts, the moving contact piece, the push rod component and the coil assembly and other parts in the cavity surrounded by the inner support cover and the iron cup. Specifically, the two static contacts are installed on the top of the inner support cover, and the static contact points of the static contacts are accommodated in the inner support cover; the inner support cover is installed on the upper part of the iron cup, so that the inner support cover and the iron cup form a cavity; the moving contact piece, the push rod component and the coil assembly and other components are respectively installed in the cavity. When sealing, the iron cup is installed in the outer shell, and epoxy glue is injected, so that the inner side of the outer shell, the inner support cover, the space between the iron cup and the static contact is filled with epoxy glue, so that the cavity surrounded by the iron cup and the inner support cover forms a closed cavity.

[0003] When an epoxy-encapsulated high-voltage DC relay is working continuously or passing a large current in a short period of time, its two static contacts will continue to heat up, causing the epoxy glue around it to turn yellow, age, and crack. At the same time, the epoxy glue around the static contacts expands under the continuous action of heat. Due to the different thermal expansion coefficients of the epoxy glue and the static contacts, the expansion change of the static contacts is different from the expansion change of the glue, and the speed of contraction is also different and unsynchronized, resulting in a decrease in the bonding force between the static contacts and the epoxy glue, resulting in separation, thereby reducing the sealing performance of the product, causing air leakage, and then failure. Summary of the invention

[0004] The present invention aims at solving the technical problems existing in the prior art and provides a high-voltage DC relay with improved sealing performance, which can improve the sealing performance of the product.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a high-voltage DC relay with improved sealing performance, including a shell component, two static contacts, a moving contact piece, and an inner support cover, wherein the inner support cover is arranged in the upper part of the shell component, the two static contacts are respectively inserted through the top of the inner support cover, the moving contact piece is located in the inner support cover and cooperates with the two static contacts; the space between the shell component, the inner support cover and the two static contacts is filled with sealing glue to form a sealing layer; the outer sides of the two static contacts are respectively provided with transition layers which are closed on all sides and in contact with the sealing layer, and the thermal conductivity of the transition layer is lower than the thermal conductivity of the static contacts.

[0006] Furthermore, the transition layer is formed on the outer side surface of the stationary contact by coating or sintering; the height of the portion where the transition layer contacts the sealing layer is greater than or equal to 3 mm.

[0007] Furthermore, the expansion coefficient of the transition layer is between that of the stationary contact and the sealing layer.

[0008] Furthermore, the melting point of the transition layer is higher than the melting point of the sealing glue.

[0009] Furthermore, a glue dispensing groove which is closed all around is provided on the upper surface of the inner support cover at the periphery of the static contact, and the sealing layer includes a first sealing layer located in the glue dispensing groove and a second sealing layer located outside the glue dispensing groove, the first sealing layer is attached to the transition layer, and the second sealing layer covers the first sealing layer.

[0010] Further, the number of the glue dispensing grooves is two, and the two glue dispensing grooves correspond one-to-one to the two static contacts, or the number of the glue dispensing groove is one, and the glue dispensing groove surrounds the two static contacts.

[0011] Furthermore, the glue dispensing groove is formed by a rib that is closed all around and is arranged on the upper surface of the inner support cover, and the outer side surface of the rib is provided with a limiting ring for limiting its outward expansion.

[0012] Furthermore, a circle of limiting bosses are respectively provided on the surrounding side surfaces of the two static contacts, and the bottom of the limiting bosses is in contact with the first sealing layer; and the surface of the limiting bosses is covered by the transition layer.

[0013] Furthermore, a fixed cover is sleeved on the top of the shell component, and the fixed cover is provided with two accommodating holes corresponding to the two static contacts one by one, and the two static contacts are respectively inserted into the corresponding accommodating holes; the fixed cover is provided with a glue injection hole, and the sealing glue enters the space through the glue injection hole; the inner end surface of the fixed cover is provided with an isolation structure, and the isolation structure separates the inside of the fixed cover into a glue injection area and a non-glue injection area enclosed on all sides, and after the sealing glue is injected into the glue injection hole, the non-glue injection area and the surface of the sealing glue reaching its bottom end form a closed space; the shell component includes an outer shell and an iron cup installed in the outer shell, the inner support cover is arranged in the upper part of the iron cup, and the iron cup is also provided with a coil assembly located under the inner support cover, and the moving contact piece is driven by a push rod component, and the push rod component is linked to the moving iron core arranged in the coil assembly; the fixed cover is located in the top of the outer shell.

[0014] Furthermore, a guide plate is provided at the bottom of the inner support cover, and the guide plate and the inner support cover are matched with a locking structure in the up and down directions; the guide plate partially or completely enters into the inner support cover, and the locking structure includes locking ribs arranged along the circumference of the outer side surface of the guide plate and a locking groove adapted to the locking ribs arranged at the bottom of the inner side surface of the inner support cover, and the locking ribs are locked into the locking grooves; the locking ribs and the locking grooves have an interference fit.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. Since the transition layers are respectively arranged on the outer sides of the two static contacts, the thermal conductivity of the transition layers is lower than that of the static contacts, and the transition layers have the effect of low heat transfer efficiency or isolating heat transfer, so that the heat generated by the static contacts slowly diffuses to the sealing layer through the transition layers, or reduces or prevents the heat generated by the static contacts from being transferred to the sealing layer. Therefore, the transition layers can buffer the high temperature of the static contacts from being transferred to the sealing layer, thereby buffering the sealing layer from the influence of high temperature and avoiding yellowing, aging and cracking of the sealing layer.

[0017] 2. The transition layer is preferably made of the metal material or non-metal material, which is easy to obtain and has low cost. In particular, the transition layer is formed on the outer side of the static contact by coating or sintering, so that the transition layer and the static contact are combined in a simple and firm manner.

[0018] 3. The expansion coefficient of the transition layer is between that of the static contact and the sealing layer, so that the difference in expansion coefficients between the static contact and the sealing layer has a step, reducing the separation caused by the difference in expansion coefficients between the static contact and the sealing layer. When the melting point of the transition layer is higher than the melting point of the sealing glue, the temperature resistance of the relay can be improved or the life of the relay under the same high temperature can be increased.

[0019] 4. Since the glue dispensing groove is provided on the upper surface of the inner support cover, the sealing layer includes a first sealing layer located in the glue dispensing groove and a second sealing layer located outside the glue dispensing groove. This makes it convenient for the manufacturer to choose to use only heat-resistant and sealing sealing glue in the glue dispensing groove, thereby not only reducing the cost of the overall sealing glue, but also reducing the expansion of the first sealing layer after being heated, further avoiding a decrease in the bonding force between the transition layer and the first sealing layer, and further improving the sealing performance of the product.

[0020] 5. The outer side surface of the rib is provided with a limiting ring for limiting its outward expansion, so that the present invention can use the limiting ring to limit the first sealing layer from expanding outward along the radial direction of the glue dispensing groove when heated, thereby further improving the sealing performance of the present invention.

[0021] 6. The two static contacts are respectively provided with limiting bosses on the four sides thereof, and the bottoms of the limiting bosses are respectively fitted with the corresponding first sealing layers, so that the present invention can utilize the limiting bosses to limit the upward expansion of the first sealing layer in the height direction after being heated, thereby further improving the sealing performance of the present invention.

[0022] 7. The setting of the fixed cover enables the fixed cover to replace the fixed ring of the existing high-voltage DC relay. The fixed cover has no extra hollow holes, which can save the amount of glue used at the hollow holes of the fixed ring, thereby reducing the cost of sealing glue. In addition, after the fixed cover is matched with the top of the shell component, there is no need to add an additional cover on the top of the shell component, thereby reducing the cost of parts. In particular, an isolation structure is provided on the inner end surface of the fixed cover, and the isolation structure separates the glue injection area and the non-glue injection area inside the fixed cover. After the glue is injected into the glue injection hole, the non-glue injection area and the glue surface reaching the bottom end thereof form a closed space, so that the fixed cover can use the closed space formed by the non-glue injection area to further reduce the amount of sealing glue, thereby further reducing the cost of sealing glue.

[0023] 8. Since the guide plate and the inner support cover are matched with a locking structure in the up and down directions, the present invention can use the locking structure to increase the degree of fit between the guide plate and the inner support cover, achieve multiple bends, thereby increasing the bending points on the arc leakage path, further reducing the risk of arc leakage, and avoiding the leakage of arcs caused by the disconnection of the two static contacts and the moving contact pieces, thereby ensuring that the normal use of the product is not affected by the leaked arc.

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

[0025] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention in Example 1;

[0026] Figure 2 is a front view of a stationary contact of the present invention in Embodiment 1;

[0027] Figure 3 is a cross-sectional view of a stationary contact of the present invention in Embodiment 1;

[0028] Figure 4 Schematic diagram of the three-dimensional structure of the inner support cover of the present invention in Example 1 Figure 1 ;

[0029] Figure 5 This is a cross-sectional view of the present invention in Example 1 Figure 1 ;

[0030] Figure 6 yes Figure 5 A magnified schematic diagram of part A;

[0031] Figure 7 is a schematic diagram of the three-dimensional structure of the fixing cover of the present invention in the first embodiment;

[0032] Figure 8 This is a cross-sectional view of the present invention in accordance with Embodiment 1 Figure 2 ;

[0033] Fig. 9 Schematic diagram of the three-dimensional structure of the inner support cover of the present invention in Example 1 Figure 2 ;

[0034] Fig.10 is a schematic diagram of the three-dimensional structure of the guide plate of the present invention in Example 1;

[0035] Fig.11 is a cross-sectional view of a guide plate and an inner support cover in a mating state according to an embodiment of the present invention;

[0036] Fig.12 yes Fig.11 A magnified schematic diagram of part B;

[0037] Fig.13 2 is a schematic diagram of the three-dimensional structure of two limiting rings of the present invention in the second embodiment;

[0038] Fig.14 1 is a top view of the inner support cover, two limit rings, static contacts, etc. in the matching state of the second embodiment of the present invention;

[0039] Fig.15 Embodiment 2 Fig.14 CC section view;

[0040] Fig.16 1 is a schematic diagram of the three-dimensional structure of the inner support cover and the static contact etc. in the matching state of the third embodiment of the present invention;

[0041] Fig.17 Embodiment 3 Fig.16 A top view of

[0042] Among them, 1. static contact, 11. transition layer, 12. limiting boss, 2. inner support cover, 21. dispensing groove, 22. rib, 23. inner rib, 24. positioning groove, 25. limiting step, 3. moving contact piece, 4. guide plate, 41. positioning rib, 5. push rod component, 6. coil assembly, 61. coil, 62. moving iron core, 63. yoke iron plate, 64. reaction spring, 7. fixed cover, 71. cover plate, 72. side plate, 711. allowance hole, 71 2. Trachea hole, 713. Wire hole, 714. Glue injection hole, 715. First surrounding wall, 716. Second surrounding wall, 718. First connecting rib, 719. Second connecting rib, 720. Isolation rib, 721 / 722 / 723. Non-glue injection area, 725. Enclosed space, 726. Limiting protrusion, 8. Sealing layer, 81. First sealing layer, 82. Second sealing layer, 9. Shell, 10. Iron cup, 20. Wire, 30. Trachea cap, 40. Limiting ring. DETAILED DESCRIPTION

[0043] In the present invention, the terms "first", "second", etc. are only used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence, nor can they be understood as indicating or implying relative importance. In the description, the orientation or position relationship indicated by "upper", "lower", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present invention, and does not indicate or imply that the device referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the scope of protection of the present invention. Example 1

[0044] See also Figure 1-Figure 12 As shown, a high-voltage DC relay with improved sealing performance of the present invention comprises a shell component, two static contacts 1, a moving contact piece 3, an inner support cover 2, a push rod component 5 and a coil assembly 6, wherein the inner support cover 2 and the coil assembly 6 are distributed in the shell component in the up-down direction, the two static contacts 1 are respectively passed through the top of the inner support cover 2, the moving contact piece 3 is located in the inner support cover 2, and is driven by the push rod component 5, the push rod component 5 is linked with the moving iron core 62 arranged in the coil assembly 6; the space between the shell component, the inner support cover 2 and the two static contacts 1 is filled with sealing glue to form a sealing layer 8; the outer side surfaces of the two static contacts 1 are respectively provided with transition layers 11 which are closed on all sides and in contact with the sealing layer 8, the thermal conductivity of the transition layer 11 is lower than the thermal conductivity of the static contact 1, so that the heat generated by the static contact 1 slowly diffuses to the sealing layer through the transition layer 11, or reduces or prevents the heat generated by the static contact from being transferred to the sealing layer.

[0045] In this embodiment, the transition layer 11 is made of metal or non-metal. The metal material includes any one of ferrous metals such as stainless steel and Kovar alloy, but is not limited to this; the non-metal material includes any one of glass, ceramic, plastic (such as Teflon, etc.), insulating coating, etc., but is not limited to this.

[0046] In this embodiment, the transition layer 11 is formed on the outer side of the static contact 1 by coating or sintering, and the height of the portion where the transition layer 11 contacts the sealing layer 8 is greater than or equal to 3 mm, so as to ensure that the sealing layer 8 around the static contact 1 has a thickness of at least greater than or equal to 3 mm, meeting the sealing requirements. The expansion coefficient of the transition layer 11 is between that of the static contact 4 and the sealing layer 8, so that the difference in expansion coefficients between the static contact 4 and the sealing layer 8 has a step, reducing the separation caused by the difference in expansion coefficients between the static contact 4 and the sealing layer 8. The melting point of the transition layer 11 is higher than the melting point of the sealing glue, which can improve the temperature resistance of the relay or increase the life of the relay at the same high temperature.

[0047] In this embodiment, Figure 4-Figure 6As shown, the upper surface of the inner support cover 2 is provided with a glue dispensing groove 21 which is closed on all sides at the periphery of each static contact 1, and the sealing layer 8 includes a first sealing layer 81 located in the glue dispensing groove 21 and a second sealing layer 82 located outside the glue dispensing groove 21, the first sealing layer 81 is attached to the lower part of the transition layer 11, the second sealing layer 82 covers the first sealing layer 81, and the upper part of the transition layer 11 is attached to the second sealing layer 82. The first sealing layer 81 can be filled with a sealing glue with high heat resistance and sealing performance, so that its heat resistance and sealing performance are higher than those of the second sealing layer 82.

[0048] In this embodiment, the two glue-dispensing grooves 21 of the inner support cover 2 are in the shape of a circular ring, but are not limited thereto. In other embodiments, the glue-dispensing grooves are in the shape of an ellipse or a square. Each glue-dispensing groove 21 of the inner support cover 2 is formed by an annular rib 22 arranged on the upper surface of the inner support cover 2 at the periphery of each static contact 1. The inner support cover 2 is provided with an inner rib 23 located at the periphery of the static contact 1 and in the shape of a ring in each glue-dispensing groove 21 thereof. The height of the inner rib 23 is less than the height of the rib 22, and the inner rib 23 is respectively interference-fitted with the corresponding static contact 1, and the first sealing layer 81 covers the inner rib 23.

[0049] In this embodiment, Figure 3-Figure 6 As shown, the sides of the two static contacts 1 are respectively provided with a circle of limiting bosses 12 higher than the bottom of the glue dispensing groove 21, the outer diameter of the limiting bosses 12 is smaller than the outer diameter of the glue dispensing groove 21, and the surface of the limiting bosses 12 is covered by the transition layer 11, and the bottoms thereof are respectively matched with the tops of the corresponding first sealing layers 81. The lower end surface of the limiting bosses 12 is a round table surface that is wide at the top and narrow at the bottom, so as to avoid the right-angle corners at the lower end surface of the limiting bosses 12, which easily causes air gaps.

[0050] In this embodiment, a fixed cover 7 is mounted on the top of the shell component. The fixed cover 7 is provided with two accommodation holes 711 corresponding to the two static contacts 1. The two static contacts 1 are respectively inserted into the corresponding accommodation holes 711. The fixed cover 7 is provided with a glue injection hole 714, and the sealing glue enters the space through the glue injection hole 714. An isolation structure is provided on the inner end surface of the fixed cover 7. The isolation structure separates the fixed cover 7 into a glue injection area and a non-glue injection area 721 / 722 / 723 enclosed on all sides. After the sealing glue is injected into the glue injection hole 714, the non-glue injection area 721 / 722 / 723 forms a closed space 725 with the surface of the sealing glue reaching the bottom thereof. Figure 8As shown. The present invention adopts the fixed cover 710 to replace the fixed ring of the high-voltage DC relay in the prior art, which can occupy a part of the volume of the sealing glue, thereby reducing the amount of glue used in the second sealing layer 829, thereby reducing the glue cost. In addition, after the fixed cover 7 is matched with the top of the outer shell 9, there is no need to add an additional cover on the top of the outer shell 9, thereby reducing the cost of parts. In particular, the setting of the non-injection area 721 / 722 / 723 inside the fixed cover 7 enables the fixed cover 7 to use the enclosed space 725 formed by the non-injection area to further reduce the amount of sealing glue, thereby further reducing the cost of sealing glue.

[0051] In this embodiment, the housing component includes an outer shell 9 and an iron cup 10 installed in the outer shell 9, the inner support cover 2 is arranged in the upper part of the iron cup 10, and the two are interference fit; the coil assembly 6 is arranged in the lower part of the iron cup 10. The fixed cover 7 is located inside the outer shell 9.

[0052] In this embodiment, Figure 7As shown, the fixed cover 7 specifically includes a cover plate 71 and a side plate 72 which is arranged circumferentially along the edge of the cover plate 1 and is closed or open on all sides. The cover plate 71 is provided with the accommodation hole 711, the trachea hole 712, the wire hole 713 and the injection hole 714, and the inner end surface of the cover plate 71 is provided with the isolation structure. Several wires 20 of the present invention are inserted into the wire hole 713, and the trachea of ​​the present invention is inserted into the trachea hole 712, and its outer end is covered by the trachea cap 30 connected to the cover plate 1. The isolation structure includes several isolation ribs 720, and several non-injection areas 721 / 722 / 723 are separated inside the main body of the fixed cover 7. Specifically, the number of the isolation ribs 720 is four, and two of them form a group. The two groups of isolation ribs 720 are distributed on the opposite sides of the two static contact 1 accommodation holes 711 in a direction perpendicular to the distribution direction of the two static contact 1 accommodation holes 711, and the distribution direction of the two isolation ribs 720 in each group is respectively consistent with the distribution direction of the two static contact 1 accommodation holes 711. The first surrounding wall 715 provided at the inner end of the wire hole 713 is extended to cooperate with the two isolation ribs of one group and the side plate 2 to enclose at least two non-injection areas, and the second surrounding wall 716 provided at the inner end of the air pipe hole 712 is extended to cooperate with the two isolation ribs of the other group and the side plate 2 to enclose at least two non-injection areas. Specifically, the relative inner ends of the two isolation ribs of one group are respectively connected to the first surrounding wall 715, and the relative outer ends of the two isolation ribs of one group are respectively connected to the inner side surface of the side panel 2, and the opposite ends of the first surrounding wall 715 are respectively extended to be connected to the side panel 2, thereby forming three non-glue injection areas 721 and 722; the second surrounding wall 716 is extended with a first connecting rib 718 and a second connecting rib 719, and the tail end of the first connecting rib 718 is connected to the relative inner ends of the two isolation ribs of the other group, and the second connecting rib 719 is connected to the inner side surface of the side panel 2, and the relative outer ends of the two isolation ribs of the other group are respectively connected to the inner side surface of the side panel 2, thereby forming two non-glue injection areas 723.

[0053] In this embodiment, the isolation ribs 720 are in the shape of long arcs, and the center of the circle faces the side where the corresponding accommodation hole 711 is located. The bottom end of each isolation rib 720 is flush with the bottom end of the side plate 2.

[0054] In this embodiment, the number of the glue injection holes 714 is four, and two of them form a group. The two groups of glue injection holes 714 are distributed on two opposite sides of the two accommodation holes 711 in a direction perpendicular to the distribution direction of the two accommodation holes 711, and the distribution direction of the two glue injection holes 714 in each group is respectively consistent with the distribution direction of the accommodation holes 711. The glue injection holes 714 are in the shape of long strips, and their centers face the side where the corresponding accommodation holes 711 are located.

[0055] In this embodiment, the height of the portion of the upper surface of the cover plate 71 corresponding to the non-glue injection area 721 / 722 / 723 is lower than the height of the remaining portions of the upper surface of the cover plate 71, so that when injecting glue, a portion of the glue can cover the portion of the upper surface of the cover plate 71 corresponding to the non-glue injection area 721 / 722 / 723, and connect with the glue on the top of the glue injection hole 714, thereby improving the sealing effect.

[0056] In this embodiment, the outer side surface of the side plate 2 is provided with a plurality of limiting protrusions 726 distributed along its circumference, which are used to be engaged one by one with a plurality of limiting grooves provided on the top of the inner side surface of the shell 9.

[0057] In this embodiment, the push rod component 5 is guided by a guide plate 4 located at the bottom of the inner support cover 2; the guide plate 4 is arranged at the bottom of the inner support cover 2, and the guide plate 4 and the inner support cover 2 are matched with a locking structure in the up and down directions.

[0058] In this embodiment, Figure 9-12 As shown, the guide plate 4 partially or completely enters the inner support cover 2, and the locking structure includes a locking rib 41 arranged along the circumference of the outer side surface of the guide plate 4 and a locking groove 24 arranged at the bottom of the inner side surface of the inner support cover 2 and adapted to the locking rib 41, and the locking rib 41 is locked into the locking groove 24. The locking ribs 4142 are non-continuous multi-segment structures, but are not limited thereto. In other embodiments, the locking ribs are continuous full-circle structures.

[0059] In this embodiment, the inner support cover 2 and the guide plate 4 are in interference fit, including the inner support cover 2 circumference and the guide plate 4 are in interference fit, and also including the inner support cover 2 partly and the guide plate 4 are in interference fit. Specifically, the positioning rib 41 and the positioning groove 24 are in interference fit, so that the guide plate 4 and the inner support cover 2 are in gapless fit at least in this section, reducing the risk of arc leakage.

[0060] In this embodiment, a limiting step 32 is provided on the inner side surface of the inner support cover 2, and the upper end of the guide plate 4 abuts against the limiting step 32, which acts as a stop to prevent the inner support cover 2 from being pressed down by excessive force. In other embodiments, a limiting step is provided at the bottom of the guide plate, and the lower end of the inner support cover abuts against the limiting step.

[0061] In this embodiment, the coil assembly 6 includes a coil 61 and a moving iron core 62 sleeved in the coil 61. When the coil 61 is energized, the coil 61 generates a magnetic field to drive the moving iron core to move upward. The moving iron core 62 drives the moving contact piece 32 to move upward through the push rod component 55, so that the moving contact piece 32 contacts the two static contacts 11 to achieve conduction, thereby achieving the purpose of controlling a large current with a small current. A yoke iron plate 63 is provided between the coil assembly 6 and the guide plate 44, and a reaction spring 64 is abutted between the yoke iron plate 63 and the moving iron core 62 to provide the moving iron core 62 with reset.

[0062] The present invention provides a high-voltage DC relay with improved sealing performance, wherein the transition layer 11 is made of a material with a lower thermal conductivity than the static contact 1, and has the function of low heat transfer efficiency or isolating heat transfer, so that the heat generated by the static contact 1 slowly diffuses to the sealing layer through the transition layer 11, or reduces or prevents the heat generated by the static contact 1 from being transferred to the sealing layer 8. Therefore, the transition layer 11 can buffer the high temperature of the static contact 2 from being transferred to the sealing layer 8, thereby buffering the sealing layer 8 from being affected by the high temperature, and avoiding the sealing layer 8 from yellowing, aging, and cracking. When the melting point of the transition layer 11 is higher than the melting point of the sealing glue, the temperature resistance of the relay can be improved or the life of the relay under the same high temperature can be improved. When the expansion coefficient of the transition layer 11 is between that of the static contact 1 and the sealing layer 8, the difference in expansion coefficient between the static contact 1 and the sealing layer 8 can be stepped, thereby reducing the separation caused by the difference in expansion coefficient between the static contact 1 and the sealing layer 8.

[0063] The high-voltage DC relay with improved sealing performance of the present invention is provided with the glue dispensing groove 21 on the upper surface of the inner support cover 2, and an independent space capable of being filled with sealing glue is pre-formed, so that the present invention makes it convenient for the manufacturer to choose to use only the sealing glue with good heat resistance and sealing performance in the glue dispensing groove 21, thereby not only reducing the cost of the overall sealing glue, but also improving the heat resistance of the product, and at the same time avoiding the decrease of the bonding force between the static contact 1 and the first sealing layer 81, thereby ensuring that the sealing performance of the product is continuously effective.

[0064] The present invention provides a high-voltage DC relay with improved sealing performance. During assembly, a sealing glue with better heat resistance and better sealing performance is added to the glue dispensing groove 21 of the inner support cover 2 in advance and dried to obtain a first sealing layer 81. After that, when the product is assembled and the glue is poured and packaged, a relatively low-priced sealing glue can be used to complete the overall sealing of the product to obtain a second sealing layer 82. Since the heat resistance and sealing performance of the first sealing layer 81 are better than those of the second sealing layer 82, when the present invention continues to work or passes a large current in a short time, the static contact 1 is not easy to cause the surrounding first sealing layer 81 to turn yellow and expand outward when heated. In particular, the static contact 1 and the first sealing layer 81 are separated by the transition layer 11, which can better avoid the decrease in the bonding force between the static contact 1 and the transition layer 11 thereon and the first sealing layer 81, thereby ensuring that the product sealing performance is continuously effective. In order to reduce the expansion of the first sealing layer 81 after being heated, the present invention also sets the limiting boss 12 on the static contact 1 to limit the expansion of the first sealing layer 81 in the height direction after being heated, thereby further improving the sealing performance of the present invention.

[0065] A high-voltage DC relay with improved sealing performance of the present invention enables the guide plate 4 and the inner support cover 2 to form a closed cavity, thereby preventing the arc generated by the disconnection of the two static contacts 1 and the moving contact piece 3 from leaking out, thereby ensuring that the normal use of the product is not affected by the leaked arc. In addition, the guide plate 44 and the inner support cover 23 are matched with the clamping structure, which can not only increase the firmness of the connection between the guide plate 4 and the inner support cover 2, but also increase the degree of coordination between the guide plate 4 and the inner support cover 2 by using the clamping structure, thereby increasing the bending points on the arc leakage path, and further reducing the risk of arc leakage.

[0066] Embodiment 2

[0067] See also Figure 13-Figure 15 As shown, a high-voltage DC relay with improved sealing performance of the present invention is different from the above-mentioned embodiment 1 in that: the outer side surfaces of each annular rib 22 of the inner support cover 2 are respectively provided with a limit ring 40 for limiting its outward expansion. Under the action of the limit ring 40, the annular rib 22 is not easy to expand outward in the radial direction, so that the first sealing layer 81 can be limited to expand outward in the radial direction after being heated, which is conducive to further improving the sealing performance of the present invention.

[0068] Embodiment 3

[0069] See also Fig.16 , Fig.17As shown, a high-voltage DC relay with improved sealing performance of the present invention is different from the above-mentioned embodiments in that: the number of the glue dispensing groove 21 is one, and the glue dispensing groove 21 surrounds the two static contacts 1; the glue dispensing groove 21 is also filled with sealing glue to form a first sealing layer 81, and the four sides of each static contact 1 are respectively fitted with the first sealing layer 81.

[0070] In this embodiment, the glue dispensing groove 21 is formed by a rib 21 with four sides closed and arranged on the upper surface of the inner support cover 2, and the rib 21 is roughly waist-shaped.

[0071] The high-voltage DC relay with improved sealing performance of the present invention also facilitates the manufacturer to choose to use only heat-resistant and well-sealed sealing glue in the glue dispensing groove 21, thereby not only reducing the cost of the overall sealing glue, but also reducing the expansion of the first sealing layer 81 after being heated, avoiding a decrease in the bonding force between the static contact 1 and the first sealing layer 81, thereby ensuring that the product's sealing performance is continuously effective.

[0072] The high-voltage DC relay with improved sealing performance of the present invention does not involve parts (for example, the structure of the push rod component 5, etc.) that are the same as those in the prior art or can be implemented by using the prior art.

[0073] The above embodiments are only used to further illustrate a high-voltage DC relay with improved sealing performance of the present invention, but the present invention is not limited to the embodiments. Any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention fall within the protection scope of the technical solution of the present invention.

Claims

1. A high-voltage DC relay with improved sealing performance, comprising a housing component, two static contacts, a moving contact piece, and an inner support cover, wherein the inner support cover is arranged in the upper part of the housing component, the two static contacts are respectively arranged on the top of the inner support cover, the moving contact piece is located in the inner support cover and cooperates with the two static contacts; the space between the housing component, the inner support cover and the two static contacts is filled with sealing glue to form a sealing layer; characterized in that: The outer sides of the two stationary contacts are respectively provided with transition layers which are closed on all sides and in contact with the sealing layer. The thermal conductivity of the transition layer is lower than that of the stationary contact.

2. The high-voltage DC relay with improved sealing performance according to claim 1, characterized in that: The transition layer is formed on the outer side surface of the stationary contact by coating or sintering; the height of the portion where the transition layer contacts the sealing layer is greater than or equal to 3 mm.

3. The high-voltage DC relay with improved sealing performance according to claim 1, characterized in that: The expansion coefficient of the transition layer is between that of the stationary contact and the sealing layer.

4. The high-voltage DC relay with improved sealing performance according to claim 1, characterized in that: The melting point of the transition layer is higher than the melting point of the sealing glue.

5. The high-voltage DC relay with improved sealing performance according to claim 1, characterized in that: The upper surface of the inner support cover is provided with a glue dispensing groove which is closed all around the periphery of the static contact, and the sealing layer includes a first sealing layer located in the glue dispensing groove and a second sealing layer located outside the glue dispensing groove, the first sealing layer is attached to the transition layer, and the second sealing layer covers the first sealing layer.

6. The high-voltage DC relay with improved sealing performance according to claim 5, characterized in that: The number of the glue dispensing grooves is two, and the two glue dispensing grooves correspond to the two static contacts one by one, or the number of the glue dispensing groove is one, and the glue dispensing groove surrounds the two static contacts.

7. The high-voltage DC relay with improved sealing performance according to claim 5 or 6, characterized in that: The glue dispensing groove is formed by a rib that is closed all around and is arranged on the upper surface of the inner support cover, and the outer side surface of the rib is sleeved with a limiting ring for limiting its outward expansion.

8. The high-voltage DC relay with improved sealing performance according to claim 5 or 6, characterized in that: A circle of limiting bosses is respectively provided on the surrounding side surfaces of the two static contacts, and the bottom of the limiting bosses is in contact with the first sealing layer; the surface of the limiting bosses is covered by the transition layer.

9. The high-voltage DC relay with improved sealing performance according to claim 1, characterized in that: A fixed cover is sleeved on the top of the shell component, and the fixed cover is provided with two accommodating holes corresponding to the two static contacts one by one, and the two static contacts are respectively inserted into the corresponding accommodating holes; the fixed cover is provided with a glue injection hole, and the sealing glue enters the space through the glue injection hole; the inner end surface of the fixed cover is provided with an isolation structure, and the isolation structure separates the inside of the fixed cover into a glue injection area and a non-glue injection area closed on all sides, and after the sealing glue is injected into the glue injection hole, the non-glue injection area and the surface of the sealing glue reaching its bottom end form a closed space; the shell component includes an outer shell and an iron cup installed in the outer shell, the inner support cover is arranged in the upper part of the iron cup, and the iron cup is also provided with a coil assembly located under the inner support cover, and the moving contact piece is driven by a push rod component, and the push rod component is linked with the moving iron core arranged in the coil assembly; the fixed cover is located in the top of the outer shell.

10. The high-voltage DC relay with improved sealing performance according to claim 1, characterized in that: A guide plate is arranged at the bottom of the inner support cover, and a locking structure is formed between the guide plate and the inner support cover in the up and down directions; the guide plate partially or completely enters into the inner support cover, and the locking structure includes locking ribs arranged along the circumference of the outer side surface of the guide plate and a locking groove adapted to the locking ribs arranged at the bottom of the inner side surface of the inner support cover, and the locking ribs are locked into the locking grooves; the locking ribs and the locking grooves have an interference fit.

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