A high voltage DC relay in a square epoxy package

Abstract

The invention discloses a square epoxy-encapsulated high-voltage DC relay, comprising a static contact lead-out terminal, an inner support cover, an iron cup, a movable reed, a push rod component, a coil component and an outer shell; two static contact lead-out terminals are mounted on the inner support cover, the inner support cover is mounted on the upper part of the iron cup, and the iron cup is inserted into the outer shell from top to bottom; the inner support cover and the iron cup are respectively in a square shape, the circumference of the top end of the inner support cover is provided with an edge portion protruding in the horizontal direction, the side wall of the inner support cover is embedded in the iron cup and matched with the iron cup interference, and the edge portion of the inner support cover is placed on the top end surface of the opening of the iron cup; the inner side wall of the upper part of the outer shell is provided with a dispensing groove extending from top to bottom, and the dispensing groove covers the outer edge of the contact between the edge portion of the inner support cover and the top end surface of the opening of the iron cup from the side. The invention can prevent the disadvantages caused by the glue infiltrating into the iron cup when the product is epoxy-encapsulated.

Description

Technical Field

[0001] The invention relates to the technical field of direct current relays, and in particular to a high-voltage direct current relay in a square epoxy package. Background Art

[0002] A relay is an electronic control device that has a control system (also called an input circuit) and a controlled system (also called an output circuit). It is usually used in automatic control circuits. It is actually an "automatic switch" that uses a smaller current to control a larger current. Therefore, it plays the role of automatic regulation, safety protection, and circuit conversion in the circuit.

[0003] The prior art high voltage DC relay usually adopts a sealed structure, and there are two main sealing methods, one is ceramic sealing and the other is epoxy sealing. The inner support cover of the epoxy sealing is usually a plastic cover, and the shape of the epoxy sealed relay is basically circular. Figure 1 The schematic diagram is a partial structure diagram of an epoxy-encapsulated high-voltage DC relay in the prior art. Figure 2 The cross-sectional view of a part of the structure of an epoxy-encapsulated high-voltage DC relay in the prior art is shown in FIG. Figure 3 for Figure 2 The enlarged schematic diagram of part A in the figure; the high-voltage DC relay includes a static contact lead-out terminal 100, a circular inner support cover 200, a cylindrical iron cup 300, a moving reed 400, a push rod component 500 and a coil component 600, etc. The two static contact lead-out terminals 100 are respectively mounted on the inner support cover 200, the inner support cover 200 is mounted on the upper part of the iron cup 300, and the moving reed 400, the push rod component 500 and the coil component 600 are mutually accommodated in the cavity surrounded by the static contact lead-out terminal, the inner support cover 200 and the iron cup 300. In order to achieve sealing, the prior art is to embed the inner support cover 200 in the inner wall of the top of the iron cup 300, and fix the inner support cover 200 and the iron cup 300 by means of interference fit between the outer wall of the inner support cover 200 and the inner wall of the top of the iron cup 300. During epoxy packaging, glue is dispensed on the inner support cover 200. Since the size of the cup mouth of the cylindrical iron cup 300 is more consistent, during sealing, the glue will not leak downward along the interference fit between the edge of the inner support cover 200 and the cup mouth of the iron cup 300, thereby ensuring the stability of product parameters. When the shape of the epoxy-encapsulated high-voltage DC relay is square, the square inner support cover is matched with the square iron cup. If the square inner support cover is still embedded in the cup mouth of the square iron cup, the dimensions of the four corners of the square iron cup cannot meet the condition of high dimensional consistency between the square iron cup and the square inner support cover due to structural and process problems. As a result, during epoxy encapsulation, the glue will seep into the iron cup from the junction of the square iron cup and the square inner support cover, thereby affecting the normal operation of the components in the iron cup and unable to guarantee the stability of the product parameters. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a square epoxy-encapsulated high-voltage DC relay, which can prevent the disadvantages caused by glue seeping into the iron cup during epoxy encapsulation of the product through structural improvement.

[0005] The technical solution adopted by the present invention to solve the technical problem is: a square epoxy-encapsulated high-voltage DC relay, comprising a static contact lead-out terminal, an inner support cover, an iron cup, a moving reed, a push rod component, a coil component and an outer shell; two static contact lead-out terminals are respectively mounted on the inner support cover, the inner support cover is mounted on the upper part of the iron cup, and the moving reed, the push rod component and the coil component are respectively accommodated in a cavity surrounded by the static contact lead-out terminal, the inner support cover and the iron cup; the outer shell is opened upward, and the iron cup is inserted into the outer shell from top to bottom; the inner support cover and the iron cup are respectively in a square shape, and the inner support cover The circumference of the top end is provided with an edge portion protruding in the horizontal direction, the side wall of the inner support cover is embedded in the iron cup and fits with the iron cup with interference, and the edge portion of the inner support cover is placed on the top end surface of the opening of the iron cup; the inner side wall of the upper part of the outer shell is provided with a glue dispensing groove extending from top to bottom, and the glue dispensing groove covers the outer edge of the contact between the edge portion of the inner support cover and the top end surface of the opening of the iron cup from the side, so as to utilize the glue dispensing body formed after glue dispensing to seal the gap between the edge portion of the inner support cover and the top end surface of the opening of the iron cup, so as to prevent the gas in the inner cavity of the iron cup from diffusing to the outer shell cavity.

[0006] The bottom surface of the glue dispensing groove is an inclined surface.

[0007] The side wall of the inner support cover is divided into an upper side wall and a lower side wall by an inclined step, and the lower side wall is provided with vertical ribs. The inner support cover is interference-fitted with the inner wall of the iron cup through the upper side wall.

[0008] In the outer wall of the lower middle part of the shell, a plurality of vertical grooves are provided along the circumference of the shell, and the depth of the grooves in the horizontal direction is roughly the same as the depth of the glue dispensing grooves in the horizontal direction, so that the shell wall thickness at the glue dispensing grooves is roughly the same as the shell wall thickness at the grooves.

[0009] The groove wall thickness of the groove is substantially the same as the shell wall thickness at the groove.

[0010] The coil component includes a coil frame and a yoke iron plate, the coil frame is installed at the bottom of the iron cup, and the iron core hole of the coil frame is vertically arranged; the coil frame includes upper and lower retaining walls and a winding window between the upper and lower retaining walls, the yoke iron plate is installed on the upper retaining wall, and the inner support cover is installed on the yoke iron plate; the opposite side edges of the bottom surface of the lower retaining wall of the coil frame are respectively provided with protrusions, so that the protrusions of the coil frame can be used to adjust the fit between the edge of the top end of the inner support cover and the top end surface of the opening of the iron cup.

[0011] A guide plate is also arranged between the inner support cover and the yoke iron plate, and a magnetic steel for arc extinguishing is arranged in the guide plate.

[0012] The upper and lower retaining walls of the coil frame are set to a square shape that matches the inner cavity of the iron cup. The protrusion is a convex burl. There are four convex burls, which are respectively located at the edges of the four corners of the bottom surface of the lower retaining wall of the coil frame.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The present invention adopts the method of providing a rim portion protruding in the horizontal direction on the circumference of the top of the inner support cover, embedding the side wall of the inner support cover into the iron cup and matching with the iron cup in interference fit, and the rim portion of the inner support cover is placed on the top surface of the opening of the iron cup; and providing a glue dispensing groove extending from top to bottom on the inner side wall of the upper part of the outer shell, and the glue dispensing groove covers the outer edge of the contact between the rim portion of the inner support cover and the top surface of the opening of the iron cup from the side. In this structure of the present invention, since the rim portion of the inner support cover is placed on the top surface of the opening of the iron cup, the glue dispensing glue operated from the top of the inner support cover will not penetrate downward into the inner cavity of the iron cup, and since the glue dispensing groove is connected to the contact between the rim portion of the support cover and the top surface of the opening of the iron cup, the glue dispensing body formed after the glue dispensing can be used to block the gap between the rim portion of the inner support cover and the top surface of the opening of the iron cup, thereby preventing the gas in the inner cavity of the iron cup from diffusing to the outer shell cavity.

[0015] 2. The present invention adopts the method of setting the bottom surface of the glue dispensing groove as an inclined surface. This structure of the present invention can, on the one hand, increase the fluidity of the glue at the bottom; on the other hand, it has a guiding effect when the iron cup and other parts are installed into the housing.

[0016] 3. The present invention adopts a method of providing a plurality of vertical grooves along the circumference of the outer wall of the middle and lower part of the shell, and the depth of the grooves along the horizontal direction is roughly the same as the depth of the glue dispensing grooves along the horizontal direction, so that the shell wall thickness at the glue dispensing grooves is roughly the same as the shell wall thickness at the grooves, and the groove wall thickness of the grooves is designed to be roughly the same as the shell wall thickness. This structure of the present invention can make the injection molding of parts easier and facilitate the production of products, and on the other hand, it makes the parts less likely to deform after being finished.

[0017] 4. The present invention adopts the method of providing convex parts on the two opposite edges of the bottom surface of the lower retaining wall of the coil frame. With this structure of the present invention, the convex parts of the coil frame can be used to adjust the fit between the edge of the top end of the inner support cover and the top end surface of the opening of the iron cup.

[0018] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the square epoxy-packaged high-voltage DC relay of the present invention is not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of a partial structure of an epoxy-encapsulated high-voltage DC relay in the prior art;

[0020] Figure 2 It is a cross-sectional view of a part of the structure of an epoxy-encapsulated high-voltage DC relay in the prior art;

[0021] Figure 3 yes Figure 2 A magnified schematic diagram of part A in FIG.

[0022] Figure 4 is a structural cross-sectional view of an embodiment of the present invention (along the line connecting the two static contact lead-out terminals);

[0023] Figure 5 1 is a structural cross-sectional view of an embodiment of the present invention (along a vertical line in the middle of a line connecting two static contact lead-out terminals);

[0024] Figure 6 It is a schematic diagram of the appearance of the iron cup, the inner support cover and the static contact lead-out terminal in the embodiment of the present invention;

[0025] Figure 7 It is a cross-sectional view of the iron cup, the inner support cover and the static contact lead-out terminal of the embodiment of the present invention;

[0026] Figure 8 yes Figure 7 A magnified schematic diagram of part B in FIG.

[0027] Fig. 9 is a schematic diagram of the three-dimensional structure of the inner support cover of an embodiment of the present invention;

[0028] Fig.10 is a schematic diagram of the three-dimensional structure of an iron cup according to an embodiment of the present invention;

[0029] Fig.11 is a schematic diagram of the three-dimensional structure of a housing of an embodiment of the present invention;

[0030] Fig.12 is a schematic diagram of the iron cup and the inner support cover of the comparative example when sealing;

[0031] Fig.13 yes Fig.12 The enlarged schematic diagram of the C part in FIG.

[0032] Fig.14 It is a schematic diagram of the iron cup and the inner support cover matching in the embodiment of the present invention during the sealing process;

[0033] Fig.15 yes Fig.14 An enlarged schematic diagram of the D portion in FIG.

[0034] Fig.16 is a schematic diagram of the three-dimensional structure of a coil frame according to an embodiment of the present invention;

[0035] Fig.17 is a cross-sectional view of the structure of the coil frame of an embodiment of the present invention fitted in the iron cup;

[0036] Fig.18 yes Fig.17 A magnified schematic diagram of part E in FIG.

[0037] Fig.19 is a schematic diagram of the reverse warping of a coil frame according to an embodiment of the present invention;

[0038] Fig. 20 It is a schematic diagram of the coordination of the inner support cover, the coil frame and the iron cup according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] Example

[0040] See also Figures 4 to 20As shown, a square epoxy-encapsulated high-voltage DC relay of the present invention comprises a static contact lead-out terminal 1, an inner support cover 2, an iron cup 3, a moving reed 4, a push rod component 5, a coil component 6 and a shell 7; two static contact lead-out terminals 1 are respectively mounted on the inner support cover 2, the inner support cover 2 is mounted on the upper part of the iron cup 3, the moving reed 4 is mounted on the upper part of the push rod component 5, the lower part of the push rod component 5 is matched in the coil component 6, and the two ends of the moving reed 4 are respectively matched with the bottom end surfaces of the two static contact lead-out terminals 1. When the coil component 6 is working, the coil component 6 moves upward through the push rod component 5, so that the two ends of the moving reed 4 are respectively in contact with the bottom end surfaces of the two static contact lead-out terminals 1, so as to realize the closing of the dynamic and static contacts. When the coil component 6 is not working, the push rod component 5 is reset by the spring and moves downward, so that the two ends of the moving reed 4 are respectively separated from the bottom end surfaces of the two static contact lead-out terminals 1, so as to realize the disconnection of the dynamic and static contacts; the moving reed 4, the push rod The component 5 and the coil component 6 are respectively accommodated in a cavity surrounded by the static contact lead-out terminal 1, the inner support cover 2 and the iron cup 3; the outer shell 7 is opened upward, and the iron cup 3 is inserted into the outer shell 7 from top to bottom; the inner support cover 2 and the iron cup 3 are respectively in a square shape, and the circumference of the top end of the inner support cover 2 is provided with an edge portion 21 protruding in the horizontal direction, the side wall 22 of the inner support cover 2 is embedded in the iron cup 3 and is interference-matched with the iron cup 3, and the edge portion 21 of the inner support cover 2 is placed on the top end surface 31 of the opening of the iron cup 3; the inner side wall of the upper part of the outer shell 7 is provided with a dispensing groove 71 extending from top to bottom, and the dispensing groove 71 covers the outer edge of the contact between the edge portion 21 of the inner support cover and the top end surface 31 of the opening of the iron cup from the side, so as to use the dispensing body 8 formed after dispensing to block the gap between the edge portion 21 of the inner support cover and the top end surface 31 of the opening of the iron cup, so as to prevent the gas in the inner cavity of the iron cup from diffusing to the outer shell cavity.

[0041] In this embodiment, the bottom surface of the glue dispensing groove 71 is set to be an inclined surface.

[0042] In this embodiment, the side wall 22 of the inner support cover 2 is divided into an upper side wall 25 and a lower side wall 26 by a sloped step 24. The lower side wall 26 is provided with vertical ribs 23 for strengthening the strength of the lower side wall 26. The inner support cover 2 is interference fit with the inner wall of the iron cup 3 through the upper side wall 25.

[0043] In this embodiment, in the outer wall of the lower and middle part of the shell 7, a plurality of vertical grooves 72 are provided along the circumference of the shell, and the depth of the groove 72 along the horizontal direction is substantially the same as the depth of the glue spot groove 71 along the horizontal direction, so that the shell wall thickness 73 at the glue spot groove is substantially the same as the shell wall thickness 74 at the groove.

[0044] In this embodiment, the groove wall thickness 75 of the groove is substantially the same as the shell wall thickness 74 at the groove.

[0045] In this embodiment, the coil component 6 includes a coil frame 61 and a yoke iron plate 62, the coil frame 61 is installed at the bottom of the iron cup 3, and the iron core hole 614 of the coil frame 61 is vertically arranged; the coil frame includes an upper retaining wall 611, a lower retaining wall 612 and a winding window 613 between the upper and lower retaining walls, the yoke iron plate 62 is installed on the upper retaining wall 611, and the inner support cover 2 is installed on the yoke iron plate 62; the opposite side edges of the bottom surface of the lower retaining wall 612 of the coil frame 61 are respectively provided with protrusions, so as to utilize the protrusions of the coil frame to adjust the fit between the edge portion 21 of the top end of the inner support cover 2 and the top end surface 31 of the opening of the iron cup 3.

[0046] In this embodiment, a guide plate 91 is installed between the inner support cover 2 and the yoke iron plate 62, and a magnetic steel 92 for arc extinguishing is installed in the guide plate 91; an exhaust pipe 93 is also installed on the inner support cover 2, and an upper cover 94 is also installed on the outer shell 7.

[0047] In this embodiment, the upper retaining wall 611 and the lower retaining wall 612 of the coil frame 61 are set to a square shape that is compatible with the inner cavity of the iron cup 3. The protrusion is a convex burl. There are four convex burls 63. The four convex burls 63 are respectively located at the edges of the four corners of the bottom surface of the lower retaining wall 612 of the coil frame, that is, there are two convex burls 63 on the opposite sides of the bottom surface of the lower retaining wall 612.

[0048] The present invention discloses a square epoxy-encapsulated high-voltage DC relay, which is provided with a rim portion 21 protruding in the horizontal direction on the circumference of the top end of an inner support cover 2, and the side wall 22 of the inner support cover is embedded in an iron cup 3 and is interference-fitted with the iron cup 3, and the rim portion 21 of the inner support cover 2 is placed on the top end surface 31 of the opening of the iron cup; and a glue dispensing groove 71 extending from top to bottom is provided on the inner side wall of the upper part of the outer shell 7, and the glue dispensing groove 71 covers the outer edge of the contact between the rim portion 21 of the inner support cover 2 and the top end surface 31 of the opening of the iron cup from the side. In this structure of the present invention, since the edge 21 of the inner support cover 2 is placed on the top surface 31 of the opening of the iron cup, the glue dispensed from the inner support cover 2 will not penetrate downward into the inner cavity of the iron cup 3. Furthermore, since the glue dispense groove 71 is connected to the contact between the edge 21 of the support cover and the top surface 31 of the opening of the iron cup, the glue dispensed body 8 formed after the glue dispense can be used to block the gap between the edge 21 of the inner support cover and the top surface 31 of the opening of the iron cup, thereby preventing the gas in the inner cavity of the iron cup from diffusing into the outer shell cavity. Fig.12 , Fig.13As shown, if no glue dispensing groove is provided on the outer shell, the glue dispensed cannot flow to the outer edge of the contact point between the edge portion 21 of the support cover 2 and the top end surface 31 of the opening of the iron cup, and the contact point between the edge portion 21 of the support cover 2 and the top end surface 31 of the opening of the iron cup cannot be completely sealed, and a leak-prone point will be formed here, causing the gas in the inner cavity of the iron cup to diffuse into the outer shell cavity.

[0049] The square epoxy-encapsulated high-voltage DC relay of the present invention adopts the method of setting the bottom surface of the glue dispensing groove 71 as an inclined surface. This structure of the present invention can increase the fluidity of the glue at the bottom on the one hand, and has a guiding effect when the iron cup and other components are installed into the housing on the other hand.

[0050] A square epoxy-encapsulated high-voltage DC relay of the present invention adopts a plurality of vertical grooves 72 provided along the circumference of the outer wall of the middle and lower part of the outer shell 7, and the depth of the groove 72 along the horizontal direction is substantially the same as the depth of the glue-dispensing groove 71 along the horizontal direction, so that the shell wall thickness 73 at the glue-dispensing groove is substantially the same as the shell wall thickness 74 at the groove, and the groove wall thickness 75 of the groove is designed to be substantially the same as the shell wall thickness 74 at the groove. This structure of the present invention can, on the one hand, make the injection molding of parts easier and facilitate the production of products, and on the other hand, make the parts less likely to deform after being finished.

[0051] A square epoxy-encapsulated high-voltage DC relay of the present invention adopts two convex buds 63 provided on the opposite side edges of the bottom surface of the lower retaining wall 612 of the coil frame 61. This structure of the present invention can use the convex buds 63 of the coil frame to adjust the fit between the edge of the top end of the inner support cover and the top end surface of the opening of the iron cup. When the inner support cover 2, the guide plate 91, the yoke iron plate 62, the coil frame 61 and the iron cup 3 are matched, if the matching dimensions between the inner support cover 2, the guide plate 91, the yoke iron plate 62 and the coil frame 61 make the bottom surface of the coil frame 61 suspended on the bottom surface of the iron cup, the convex 63 can be used to press against the bottom surface of the iron cup to form support for the coil frame 61 and other components. If the matching dimensions between the inner support cover 2, the guide plate 91, the yoke iron plate 62 and the coil frame 61 make it impossible for the edge portion 21 of the support cover to contact the top end surface 31 of the opening of the iron cup, that is, there is a gap between the edge portion 21 of the support cover and the top end surface 31 of the opening of the iron cup, such as Fig.19 , Fig. 20 As shown, when the coil frame 61 is pressed down, the convex bulge 63 is acted upon by the upward force F of the iron cup 3, causing the edge of the lower retaining wall 612 of the coil frame 61 to bend upward M, and the middle part to sink, so that the edge portion 21 of the support cover can contact the top end surface 31 of the opening of the iron cup, avoiding glue penetration during dispensing.

[0052] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above in the preferred embodiment, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. A square epoxy-encapsulated high-voltage DC relay, comprising a static contact lead-out terminal, an inner support cover, an iron cup, a moving reed, a push rod component, a coil component and an outer shell; two static contact lead-out terminals are respectively mounted on the inner support cover, the inner support cover is mounted on the upper part of the iron cup, and the moving reed, the push rod component and the coil component are respectively accommodated in a cavity surrounded by the static contact lead-out terminal, the inner support cover and the iron cup; the outer shell is opened upward, and the iron cup is inserted into the outer shell from top to bottom; characterized in that: The inner support cover and the iron cup are respectively square in shape, and the circumference of the top end of the inner support cover is provided with an edge portion protruding in the horizontal direction, the side wall of the inner support cover is embedded in the iron cup and interference fits with the iron cup, and the edge portion of the inner support cover rests on the top end surface of the opening of the iron cup; the inner side wall of the upper part of the outer shell is provided with a glue dispensing groove extending from top to bottom, and the glue dispensing groove covers the outer edge of the contact between the edge portion of the inner support cover and the top end surface of the opening of the iron cup from the side, so as to utilize the glue dispensing body formed after glue dispensing to seal the gap between the edge portion of the inner support cover and the top end surface of the opening of the iron cup, thereby preventing the gas in the inner cavity of the iron cup from diffusing to the outer shell cavity.

2. The square epoxy encapsulated high voltage DC relay according to claim 1, characterized in that: The bottom surface of the glue dispensing groove is an inclined surface.

3. The square epoxy encapsulated high voltage DC relay according to claim 1, characterized in that: The side wall of the inner support cover is divided into an upper side wall and a lower side wall by an inclined step, and the lower side wall is provided with vertical ribs. The inner support cover is interference-fitted with the inner wall of the iron cup through the upper side wall.

4. The square epoxy encapsulated high voltage DC relay according to claim 1, characterized in that: In the outer wall of the lower middle part of the shell, a plurality of vertical grooves are provided along the circumference of the shell, and the depth of the grooves in the horizontal direction is the same as the depth of the glue dispensing grooves in the horizontal direction, so that the shell wall thickness at the glue dispensing grooves is the same as the shell wall thickness at the grooves.

5. The square epoxy encapsulated high voltage DC relay according to claim 4, characterized in that: The groove wall thickness of the groove is the same as the shell wall thickness at the groove.

6. The square epoxy encapsulated high voltage DC relay according to claim 1, characterized in that: The coil component includes a coil frame and a yoke iron plate, the coil frame is installed at the bottom of the iron cup, and the iron core hole of the coil frame is vertically arranged; the coil frame includes upper and lower retaining walls and a winding window between the upper and lower retaining walls, the yoke iron plate is installed on the upper retaining wall, and the inner support cover is installed on the yoke iron plate; the opposite side edges of the bottom surface of the lower retaining wall of the coil frame are respectively provided with protrusions, so that the protrusions of the coil frame can be used to adjust the fit between the edge of the top end of the inner support cover and the top end surface of the opening of the iron cup.

7. The square epoxy encapsulated high voltage DC relay according to claim 6, characterized in that: A guide plate is also arranged between the inner support cover and the yoke iron plate, and a magnetic steel for arc extinguishing is arranged in the guide plate.

8. The square epoxy encapsulated high voltage DC relay according to claim 6, characterized in that: The upper and lower retaining walls of the coil frame are set to a square shape that matches the inner cavity of the iron cup. The protrusion is a convex burl, and there are four convex burls. The four convex burls are respectively located at the edges of the four corners of the bottom surface of the lower retaining wall of the coil frame.

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