High-tightness high-voltage ceramic contactor

Abstract

The utility model relates to a high-sealing-performance high-voltage ceramic contactor, and relates to the technical field of contactors, the high-sealing-performance high-voltage ceramic contactor comprises an outer cover, a shell cover covering the outer cover, a substrate located in the outer cover and an inner cover fixed on the substrate, the outer cover is internally provided with a control assembly and two binding posts fixed on the inner cover, the inner cover is internally provided with a coil assembly, and the coil assembly is arranged in the inner cover. A magnetic steel frame is fixedly arranged on the periphery of the inner cover; the upper end portion of the binding post extends out of the upper side face of the inner cover, and a positioning through hole for the binding post to penetrate through is formed in the shell cover. A positioning through hole is formed in the inner cover, an accommodating gap for accommodating a sealant is preset between the periphery of the binding post and the inner wall of the positioning through hole, a barrier strip positioned above the inner cover is fixedly arranged on the inner wall of the positioning through hole, the barrier strip is sleeved outside the binding post, and a filling gap for accommodating the sealant is preset between the inner side surface of the barrier strip and the periphery of the binding post; according to the invention, the possibility that external dust or water vapor affects the coil assembly in the inner cover is reduced.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of contactors, in particular to a high-pressure ceramic contactor with high sealing performance. BACKGROUND

[0002] With the rapid development of power electronic technology, high-voltage devices are increasingly widely used in the fields of electric power, new energy, industrial control, etc. In order to meet the demand for high performance, high reliability and high safety of high-voltage devices in these fields, small high-voltage ceramic contactors have emerged as the times require. It combines the excellent performance of ceramic materials and the functional characteristics of high-voltage contactors, has the advantages of small size, light weight, good insulation performance, high temperature resistance, arc resistance, etc., and therefore is widely used in various high-voltage devices.

[0003] In the related art, the design of a DC contactor includes key components such as an outer cover, a shell cover, a base plate and an inner cover. The inner cover is internally provided with a core assembly and a coil assembly. A terminal post is fixedly installed on the inner cover by means of a bolt. The lower end of the terminal post penetrates the upper side of the inner cover and extends into the interior of the inner cover. Among them, the outer cover, the shell cover and the base plate are usually made of insulating plastic material to ensure electrical safety, while the inner cover is made of ceramic material to improve the insulation performance and high temperature resistance.

[0004] In the prior art, in order to reduce the potential impact of the external environment on the sensitive components (such as the core assembly and the coil assembly) inside the inner cover, a sealant (epoxy glue) is usually used to seal the gap between the terminal post and the inner cover (ceramic surface), i.e. the epoxy glue is applied to the gap between the terminal post and the inner cover.

[0005] However, the demand for small high-voltage contactors is increasing in the current market, and the size of the contactor is becoming smaller and smaller. With the reduction of the size of the contactor, the dispensing space is severely limited, which makes it difficult to implement the traditional dispensing sealing method, and the sealing effect is difficult to guarantee. In humid or rainy areas, if the sealing effect is poor, the small gap between the terminal post and the inner cover may become a channel for external dust or water vapor to enter, which may then penetrate into the interior of the contactor and cause damage to the internal electrical components, seriously affecting the performance and service life of the contactor. CONTENT OF THE INVENTION

[0006] The purpose of the present application is to provide a high-pressure ceramic contactor with high sealing performance, which solves the problem that the poor sealing performance between the terminal post and the inner cover may cause damage to the sensitive components inside the contactor in humid or rainy areas.

[0007] The high-pressure ceramic contactor with high sealing performance provided by the present application adopts the following technical solution:

[0008] The utility model provides a high pressure ceramic contactor of high sealing property, including the cover, the shell cover of cover setting on the cover, the substrate in the cover and the inner cover fixed on the substrate, control assembly is equipped with in the cover and is fixed on the two binding posts of inner cover, the inside of inner cover is equipped with coil assembly, the outer periphery of inner cover is fixed with the magnetic steel frame, the upper end of binding post extends the upper side of inner cover, the positioning through -hole that the shell cover is set up is passed in for binding post, the inner wall between the outer periphery of binding post and positioning through -hole is prearranged and is placed into the containing gap for sealant, the inner wall of positioning through -hole is fixed with the barrier strip located above inner cover, the barrier strip is set up in the outside of binding post, the inner side of barrier strip and the outer periphery of binding post are prearranged and are placed into the filling gap for sealant.

[0009] Through adopting the above technical scheme, since the containing gap and the filling gap are cooperatively arranged, when the sealant is used to seal the connection between the binding post and the inner cover, a sealed space is arranged, the sealant can be injected into the containing gap, and then flows into the filling gap along the barrier strip, and when the sealant is dried, the insulation sealing is realized, the sealing effect between the binding post and the inner cover is ensured, and the possibility that the coil assembly in the inner cover is affected by external dust or water vapor is reduced.

[0010] Optionally, a first buffer gap is prearranged between the bottom side of the barrier strip and the shell cover.

[0011] Through adopting the above technical scheme, since the first buffer gap is arranged and the first buffer gap is communicated with the buffer gap, when the sealant flows into the filling gap along the containing gap, the sealant can continue to flow into the first buffer gap, so that the connection between the binding post and the inner cover can be better covered, and the insulation sealing performance at the position is further improved.

[0012] Optionally, a limiting strip is fixed on the side edge of the shell cover towards the inner cover and located below the barrier strip and above the magnetic steel frame, and a second buffer gap is arranged between the inner side of the limiting strip and the outer side of the inner cover and communicated with the first buffer gap.

[0013] Through adopting the above technical scheme, since the second buffer gap is arranged, the sealant flowing into the first buffer gap can flow into the second buffer gap, and after the sealant is dried, the connection between the binding post and the inner cover can be more comprehensively covered, and the insulation sealing performance is enhanced.

[0014] Optionally, a third buffer gap is prearranged between the bottom side of the limiting strip and the upper side of the magnetic steel frame and communicated with the second buffer gap.

[0015] By adopting the technical scheme, the sealant flowing into the second buffer gap can continue to be injected into the third buffer gap, and the coating effect of the connection between the terminal post and the inner cover is further enhanced after the sealant is dried, and the insulation and sealing performance is enhanced.

[0016] Optionally, the upper side edge of the inner cover is a rounded corner.

[0017] By adopting the technical scheme, the sealant can be injected into the second buffer gap along the first buffer gap.

[0018] Optionally, the control assembly includes a circuit board of the coil assembly and a cable connected with the circuit board; the inner cover is provided with a mounting cavity for fixing the circuit board, one end of the cable extends to the inside of the mounting cavity after penetrating through the shell cover, and the inner end of the cable is connected with the circuit board; and the mounting cavity is filled with filling glue for covering the connection between the cable and the circuit board.

[0019] By adopting the technical scheme, after the cable is connected with the circuit board, the filling glue is injected into the mounting cavity to cover the connection between the cable and the circuit board, and then the contactor is placed in the oven for drying, so as to reduce the influence of external rainwater or water vapor on the connection between the circuit board and the cable and improve the sealing and insulation performance of the contactor.

[0020] Optionally, the outer edge of the shell cover is provided with a guide slope.

[0021] By adopting the technical scheme, the guide slope is provided, so that the worker can install the shell cover at the opening on the upper side of the outer cover along the guide slope.

[0022] Optionally, the side outer edge of the shell cover away from the outer cover is provided with a containing ring groove for placing the sealant.

[0023] By adopting the technical scheme, during the assembly of the shell cover and the outer cover, the shell cover can be buckled to the outer cover, so that the sealant is placed in the containing ring groove, and the sealing and insulation of the shell cover and the outer cover can be realized after drying, and the sealing and insulation performance of the contactor is improved.

[0024] In summary, the present application has at least one of the following beneficial technical effects:

[0025] 1. Due to the cooperation of the containing gap and the filling gap, when the sealant is used to seal the connection between the terminal post and the inner cover, the sealant can be injected into the containing gap, and then flows into the inside of the filling gap along the barrier strip, and the insulation and sealing can be realized after the sealant is dried, the sealing effect between the terminal post and the inner cover is ensured, and the possibility of the influence of external dust or water vapor on the coil assembly in the inner cover is reduced.

[0026] 2. Due to the installation cavity and the setting of the filling glue in the installation cavity, after the cable is connected with the circuit board, the filling glue is injected into the installation cavity, thereby covering the connection between the cable and the circuit board, and then the contactor is placed into the oven for drying, so as to reduce the influence of external rain or water vapor on the connection between the circuit board and the cable, and improve the sealing and insulation performance of the contactor. BRIEF DESCRIPTION OF DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0028] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0029] Figure 2 is a schematic diagram of the exploded structure of the embodiment of the present application;

[0030] Figure 3 is a schematic diagram of the cross-sectional structure of the embodiment of the present application embodying the mounting cooperation of the terminal post;

[0031] Figure 4 is a schematic diagram of the local cross-sectional structure of the embodiment of the present application embodying the mounting cooperation of the shell cover and the outer cover;

[0032] Figure 5 is a schematic diagram of the structure of the embodiment of the present application embodying the installation and distribution of the blocking strip and the limiting strip;

[0033] Figure 6 is a schematic diagram of the local cross-sectional structure of the embodiment of the present application embodying the setting and distribution of the first buffer gap, the second buffer gap and the third buffer gap;

[0034] Figure 7 is a schematic diagram of the structure of the embodiment of the present application embodying the mounting cooperation of the control assembly;

[0035] Figure 8 is a schematic diagram of the local cross-sectional structure of the embodiment of the present application embodying the mounting cooperation of the control assembly.

[0036] In the figure, 1, cover; 11, mounting cavity; 2, shell cover; 21, positioning hole; 22, guide slope; 23, containing ring groove; 24, barrier strip; 25, limiting strip; 3, inner cover; 31, terminal post; 311, containing gap; 312, filling gap; 313, first buffer gap; 314, second buffer gap; 315, third buffer gap; 32, magnetic steel frame; 4, base plate; 5, coil assembly; 6, control assembly; 61, circuit board; 62, cable; 63, filling glue. DETAILED DESCRIPTION

[0037] The application is further described in detail below with reference to all the drawings.

[0038] Embodiment:

[0039] With reference to Figure 1 , Figure 2 and Figure 3 , a high-sealing high-voltage ceramic contactor includes a cover 1, a shell cover 2 arranged on the cover 1, a base plate 4 located in the cover 1, and an inner cover 3 fixed on the base plate 4. The inner cover 3 is internally provided with a coil assembly 5. The cover 1 is internally provided with a control assembly 6 for controlling the coil assembly, and two terminal posts 31 fixedly installed on the inner cover 3.

[0040] A magnetic steel frame 32 is fixedly arranged on the outer periphery of the inner cover 3. The upper end of the terminal post 31 extends out of the upper side of the inner cover 3. The shell cover 2 is provided with a positioning hole 21 for the terminal post 31 to pass through. When the contactor works, the coil assembly 5 and the terminal post 31 can be controlled to be connected or disconnected, thereby realizing the application of the contactor. This is a conventional contactor structure, and the specific principle is not described here.

[0041] With reference to Figure 4 , a guide slope 22 is arranged on the outer edge of the shell cover 2, which facilitates the installation of the shell cover 2 on the opening of the upper side of the cover 1 by the staff along the guide slope 22. The outer edge of the side of the shell cover 2 away from the cover 1 is pre-provided with a containing ring groove 23 for placing sealant. The sealant is epoxy glue. After the contactor is placed in an oven for drying, the entire product is isolated from the outside world.

[0042] With reference to Figure 5 and Figure 6 , a containing gap 311 for placing sealant is pre-provided between the outer periphery of the terminal post 31 and the inner wall of the positioning hole 21. A barrier strip 24 located above the inner cover 3 is fixedly formed on the inner wall of the positioning hole 21. The profile shape of the barrier strip 24 is arc-shaped. After the installation of the shell cover 2 is completed, the barrier strip 24 is sleeved on the outside of the terminal post 31. The inner side of the barrier strip 24 and the outer periphery of the terminal post 31 are pre-provided with a filling gap 312 for placing sealant.

[0043] With reference to Figure 5 and Figure 6The bottom side of the barrier strip 24 and the shell cover 2 are provided with a first buffer gap 313; the shell cover 2 is symmetrically provided with two limiting strips 25 on the side edge thereof, which are located below the barrier strip 24 and above the magnetic steel frame 32; the inner side of the limiting strip 25 and the outer side of the inner cover 3 are provided with a second buffer gap 314 which is in communication with the first buffer gap 313; the bottom side of the limiting strip 25 and the upper side of the magnetic steel frame 32 are provided with a third buffer gap 315 which is in communication with the second buffer gap 314.

[0044] With reference to Figure 6 When filling the gap between the terminal post 31 and the shell cover 2, the sealant is injected into the accommodation gap 311 and the filling gap 312, and then the sealant flows into (naturally flows) the first buffer gap 313, the second buffer gap 314 and the third buffer gap 315 in turn; the sealant here is also epoxy glue, and after injection, the epoxy glue is placed in an oven for drying, so as to realize the insulation sealing between the terminal post 31 and the shell cover 2.

[0045] With reference to Figure 6 The upper side edge of the inner cover 3 is rounded, so as to facilitate the injection of the sealant from the first buffer gap 313 to the second buffer gap 314. According to the flow characteristics of the epoxy glue, the epoxy glue can fill a gap of 0.5 mm or less when it is in a horizontal plane. Therefore, the corresponding gaps are set as follows:

[0046] The width of the filling gap 312 is not greater than 0.3 mm, the width of the first buffer gap 313 is 0.3 mm, the width of the second buffer gap 314 is 0.5 mm, and the width of the third buffer gap 315 is 0.4 mm. Without complex structure, the natural flow and drying can achieve the insulation effect, which is a simple and reliable structure design.

[0047] With reference to Figure 7 and Figure 8 The control assembly 6 includes a circuit board 61 of the control coil assembly 5 and two cables 62 connected with the circuit board 61; the inner cover 1 is provided with a mounting cavity 11 for placing the circuit board 61 and fixed by a screw, and one end of the cable 62 extends to the inside of the mounting cavity 11 after penetrating through the shell cover 2, and the inner end of the cable 62 is electrically connected with the circuit board 61, and the mounting cavity 11 is filled with a filling glue 63 covering the connection between the cable 62 and the circuit board 61, wherein the filling glue 63 is epoxy glue;

[0048] After the inner end of the cable 62 is electrically connected with the circuit board 61, the filling glue 63 is injected into the mounting cavity 11 to cover the connection between the cable 62 and the circuit board 61, and then the contactor is placed in an oven for drying, so as to reduce the influence of external rain or water vapor on the connection between the circuit board 61 and the cable 62 and improve the sealing and insulation performance of the contactor.

[0049] The implementation principle of the embodiment of the present application is:

[0050] During the installation of the ceramic contactor, the cable 62 and the circuit board 61 in the installation cavity 11 are first sealed by the filling glue 63; then the shell cover 2 is buckled to the outer cover 1, so that the sealing glue is placed in the accommodating ring groove 23 to realize the sealing and insulation of the shell cover 2 and the outer cover 1; then the sealing glue is injected into the filling gap 312, and then the sealing glue flows into (naturally flows) the first buffer gap 313, the second buffer gap 314 and the third buffer gap 315 in turn; finally, the product is placed in an oven for drying.

[0051] Unless otherwise defined, the terms or scientific terms used in the present application shall be understood as the usual meaning understood by a person with ordinary skills in the art to which the present application belongs. The terms "first", "second", "third" and the like used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. The terms "one" or "a" and the like do not represent a quantity limitation, but represent the existence of at least one. The terms "including", "containing" and the like mean that the elements or objects appearing before "including" or "containing" cover the elements or objects listed after "including" or "containing" and their equivalents, and do not exclude other elements or objects. The terms "upper", "lower", "left", "right" and the like only represent relative positional relationships, and when the absolute positions of the described objects are changed, the relative positional relationships may also be changed accordingly.

[0052] The embodiments of the specific implementation are the preferred embodiments of the present application, and do not limit the protection scope of the present application. The same parts are denoted by the same reference numerals. Therefore, any equivalent changes made according to the structure, shape, principle of the present application shall be covered within the protection scope of the present application.

Claims

1. A high-sealing high-voltage ceramic contactor, comprising an outer cover (1), a shell cover (2) covering the outer cover (1), a base plate (4) located inside the outer cover (1), and an inner cover (3) fixed on the base plate (4). The outer cover (1) is provided with a control assembly (6) and two terminals (31) fixed on the inner cover (3). The inner cover (3) is provided with a coil assembly (5). A magnet frame (32) is fixed on the outer periphery of the inner cover (3). The upper end of the terminal (31) extends to the upper side of the inner cover (3). The shell cover (2) is provided with a positioning through hole (21) through which the terminal (31) passes. Its features are, A pre-set gap (311) for sealing adhesive to be inserted is provided between the outer periphery of the terminal (31) and the inner wall of the positioning through hole (21). A barrier strip (24) located above the inner cover (3) is fixed on the inner wall of the positioning through hole (21). The barrier strip (24) is sleeved on the outside of the terminal (31). A filling gap (312) for sealing adhesive to be inserted is pre-set between the inner side of the barrier strip (24) and the outer periphery of the terminal (31).

2. The high-sealing high-pressure ceramic contactor according to claim 1, characterized in that, A first buffer gap (313) is pre-set between the bottom side of the barrier strip (24) and the shell cover (2).

3. A high-sealing, high-pressure ceramic contactor according to claim 2, characterized in that, The shell cover (2) is fixedly provided with a limiting strip (25) located below the barrier strip (24) and above the magnetic steel frame (32) on the side edge facing the inner cover (3); A second buffer gap (314) communicating with the first buffer gap (313) is provided between the inner side of the limiting strip (25) and the outer side of the inner cover (3).

4. A high-sealing, high-pressure ceramic contactor according to claim 3, characterized in that, A third buffer gap (315) communicating with the second buffer gap (314) is pre-set between the bottom side of the limiting strip (25) and the upper side of the magnetic steel frame (32).

5. A high-sealing, high-pressure ceramic contactor according to claim 3, characterized in that, The upper edge of the inner cover (3) is rounded.

6. A high-sealing, high-pressure ceramic contactor according to claim 1, characterized in that, The control component (6) includes a circuit board (61) of the control coil assembly (5) and a cable (62) connected to the circuit board (61); The outer cover (1) has an installation cavity (11) inside for the circuit board (61) to be placed and fixed. One end of the cable (62) extends through the cover (2) and into the installation cavity (11). The inner end of the cable (62) is connected to the circuit board (61). The installation cavity (11) is filled with filler glue (63) covering the connection between the cable (62) and the circuit board (61).

7. A high-sealing, high-pressure ceramic contactor according to claim 1, characterized in that, The outer edge of the shell cover (2) is provided with a guide slope (22).

8. A high-sealing, high-pressure ceramic contactor according to claim 1, characterized in that, The outer edge of the cover (2) away from the outer cover (1) is provided with a receiving annular groove (23) for the sealant to be inserted.

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