A switch with voltage breakdown resistance structure and glue injection plastic sealed switch

Abstract

The present invention discloses a voltage breakdown resistance structure for a switch and a plastic-injection sealed switch. The voltage breakdown resistance structure for the switch includes a housing, two electrically non-connected conductive bodies installed in the housing and provided with static contacts, and a movable contact corresponding to the static contacts in the housing. In the area between the mating positions of the static contacts and the corresponding movable contacts of the two conductive bodies, at least two first retaining walls are extended from the first side inner wall of the housing toward the area to form a recess. In the second side inner wall of the housing, at least one second retaining wall is extended toward the area, and the extended end of the second retaining wall abuts or is inserted into the opening of the corresponding recess to form a clean area in the corresponding recess, effectively blocking the voltage breakdown between the two conductive bodies. The present invention can effectively block the voltage breakdown between two non-connected conductive elements, thereby improving the voltage breakdown resistance of the switch.

Description

Technical Field

[0001] The present invention belongs to the technical field of switches, and in particular relates to a voltage breakdown resistant structure of a switch and a glue injection plastic sealed switch. Background Art

[0002] A switch in the prior art typically includes contacts and conductive components. To achieve a certain insulation safety level, many standards and certifications stipulate the dielectric withstand voltage of such switches. That is, when a certain voltage is connected between two unconnected conductive components, the leakage current should be less than the specified value or no breakdown or flashover will occur. The existing technology mostly adopts the following two methods to ensure that the dielectric withstand voltage of the switch can meet the requirements of relevant standards and certifications. One is to achieve this by increasing the air gap between two unconnected conductive components. This structure is bound to increase the volume of the product; the other is to achieve this by increasing the creepage distance between two unconnected conductive components. A more typical implementation method is to set a retaining wall or groove between the two conductive components, and use the retaining wall or groove to increase the creepage distance between the two conductive components; the above two methods can improve the voltage breakdown resistance of the switch to a certain extent. However, the problem with this type of switch is that after the switch is powered on, its contacts will produce splashes under the action of the arc. Once there are too many splashes, they will cover the plastic surface between the two conductive components (including across the retaining wall and across the groove), directly connecting the two conductive components that were originally unconnected, thereby causing the disadvantage of unqualified dielectric withstand voltage.

[0003] In addition, in the fast-acting switches of the prior art, a normally closed contact group and a normally open contact group are usually provided. In order to meet the insulation safety level requirements, a retaining wall needs to be provided on the base between the normally closed contact group and the normally open contact group. However, an isolation boss is usually provided at the position between the normally closed contact group and the normally open contact group of the base. The specific isolation boss is provided at the position between the normally closed moving contact and the normally open moving contact. The function of the isolation boss is to isolate the moving spring contact when the spring piece on one side of the moving component breaks, so that the moving contact does not contact the normally closed static contact and the normally open static contact. The existence of the isolation boss limits the width of the retaining wall. The width of the retaining wall refers to the direction of the connection line between the two normally open moving contacts along the moving component. Since the width of the retaining wall cannot be long enough, the isolation effect of the retaining wall is affected. Summary of the Invention

[0004] The purpose of the present invention is to overcome the shortcomings of the existing technology and provide a switch voltage breakdown resistance structure and a plastic injection-molded switch. Through structural improvement, the voltage breakdown resistance between two unconnected conductive elements can be effectively blocked, thereby improving the voltage breakdown resistance of the switch.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a voltage breakdown resistance structure of a switch, comprising a shell, two conductors installed in the shell that are not electrically connected to each other and are provided with static contacts, and a movable contact in the shell that corresponds to the static contact; in an area between the matching position of the static contact and the corresponding movable contact of one conductor and the matching position of the static contact and the corresponding movable contact of the other conductor, at least two first retaining walls are extended from the first side inner wall of the shell toward the area to form a recess between the two adjacent first retaining walls; in the second side inner wall of the shell opposite to the first side inner wall, at least one second retaining wall is extended toward the area, and the extended end of the second retaining wall abuts or is inserted into the opening of the corresponding recess, so as to utilize the matching of the second retaining wall at the opening of the corresponding recess to prevent splashes generated by the movable contact and the static contact under the action of the arc from entering the corresponding recess, thereby forming a clean area in the corresponding recess, effectively blocking the voltage breakdown between the two conductors.

[0006] Furthermore, in the second side inner wall of the shell, at least two first retaining walls are extended toward the area to form a recess between two adjacent first retaining walls; in the first side inner wall of the shell, at least one second retaining wall is extended toward the area, and the extended end of the second retaining wall of the first side inner wall of the shell reaches or is inserted into the opening of the corresponding recess of the second side inner wall.

[0007] In the inner wall of the shell corresponding to the area between the mating position of the static contact and the corresponding moving contact of one conductor and the mating position of the static contact and the corresponding moving contact of the other conductor, at least one recess is provided in the position corresponding to the first barrier wall to the conductor to increase the creepage distance.

[0008] In the first side inner wall of the shell, two first retaining walls are extended toward the area to form a recess between the two first retaining walls. The first side inner wall of the shell is also provided with a second retaining wall extending toward the area, and the second retaining wall is provided in the recess of the first side inner wall of the shell; in the second side inner wall of the shell, two first retaining walls are extended toward the area to form a recess between the two first retaining walls. The second side inner wall of the shell is also provided with a second retaining wall extending toward the area, and the second retaining wall is provided in the recess of the second side inner wall of the shell.

[0009] The two first retaining walls of the first side inner wall of the shell are arranged opposite to the two first retaining walls of the second side inner wall of the shell, and the extended ends of the two first retaining walls of the first side inner wall of the shell are close to the extended ends of the two first retaining walls of the second side inner wall of the shell; the second retaining wall of the first side inner wall of the shell is staggered and inserted into the second retaining wall of the second side inner wall of the shell.

[0010] The two first retaining walls and one second retaining wall of the first side inner wall of the shell are arranged in parallel, and the two first retaining walls and one second retaining wall of the second side inner wall of the shell are also arranged in parallel.

[0011] In the first side inner wall of the shell and / or in the first side inner wall of the shell, one of the two first retaining walls is integrally connected to the second retaining wall.

[0012] A glue-injected plastic-sealed switch comprises a cover plate, a base, a core component, lead terminals and a voltage breakdown-resistant structure for the switch; the base is provided with a concave cavity surrounded by four side walls and a bottom wall, the cover plate is fixed to the concave cavity of the base and forms the shell together with the base, the bottom wall of the base is the first side inner wall of the shell, and the inner side of the cover plate is the second side inner wall of the shell; the core component is installed in the concave cavity, and the moving contact is provided on the core component; the two conductors installed in the shell that are not electrically connected to each other and are provided with static contacts are two lead terminals assembled on the side of the base and used to cooperate with the moving contact of the core component to realize normally closed mode and normally open mode.

[0013] The two sides of the base are respectively equipped with normally closed lead terminals and normally open lead terminals; the movement component has a normally open dynamic reed and a normally closed dynamic reed, and the two ends of the normally open dynamic reed and the normally closed dynamic reed respectively match the normally open lead terminals and the normally closed lead terminals on the two sides of the base; the bottom wall of the base is provided with an isolation boss, and the isolation boss is located at a position corresponding to the end of the normally open dynamic reed and the end of the normally closed dynamic reed; the first retaining wall in the bottom wall of the base reaches or approaches the isolation boss in width.

[0014] The isolation boss is provided with a notch for increasing the creepage distance, and a preset gap is provided between the second retaining wall in the bottom wall of the base and the isolation boss in width.

[0015] In the base, a first groove is provided at an edge of the base corresponding to an area where the lead terminals are distributed, which is relatively deep and passes through each lead terminal. In the cover plate, a first protrusion is provided at a position corresponding to the first groove, so that a first glue injection channel with a relatively deep depth is formed by the cooperation of the first protrusion and the first groove; in the cover plate, a second groove is provided at an edge of the cover plate corresponding to an area where no lead terminals are distributed, which is relatively shallow and along the edge direction; in the base, a second protrusion is provided at a position corresponding to the second groove, so that a second glue injection channel with a relatively shallow depth is formed by the cooperation of the second protrusion and the second groove; two ends of the first protrusion are respectively connected to two ends of the second groove, so that the first glue injection channel and the second glue injection channel are connected to form a glue injection channel that surrounds the entire edge of the base and the cover plate and surrounds the core component; the glue injection channel is provided with at least one glue injection port leading to the outside, so that sealant is injected into the glue injection channel by the glue injection port to form a cured plastic sealing body in the glue injection channel, thereby realizing plastic sealing of the core component.

[0016] In the cover plate, a third protrusion is further provided along the setting direction of the second groove, and the second groove is provided in the third protrusion.

[0017] The glue injection port is arranged at a position in the cover plate corresponding to the first glue injection channel; the glue injection port includes a mouth and a connecting channel; the mouth is trumpet-shaped; the large end of the trumpet shape of the mouth is located on the outer side of the cover plate; the small end of the trumpet shape of the mouth is connected to one end of the connecting channel; the other end of the connecting channel passes through the first protrusion and is connected to the first glue injection channel.

[0018] The glue injection port is arranged at a position in the base corresponding to the first glue injection channel; the glue injection port includes a mouth and a connecting channel; the mouth is trumpet-shaped; the large end of the trumpet shape of the mouth is located on the outer side of the base; the small end of the trumpet shape of the mouth is connected to one end of the connecting channel; the other end of the connecting channel passes into the first groove and is connected to the first glue injection channel.

[0019] In the lead terminal, a through hole for allowing sealant to pass through is provided at a position corresponding to the first groove and in the middle of the lead terminal.

[0020] In the lead terminal, notches are provided at positions corresponding to the first groove and on both sides of the width of the lead terminal to allow sealant to pass through.

[0021] The base and the cover plate are respectively provided with recessed portions at positions corresponding to the width of the lead terminal passing through the first groove, so as to allow the sealant to pass through the width of the lead terminal.

[0022] In the base, an inclined convex portion is provided at the junction of the two ends of the first groove and the two ends of the second protrusion; the high end of the inclined convex portion is connected to the second protrusion, and the position of the high end is flush with the protrusion top surface of the second protrusion; the low end of the inclined convex portion is connected to the first groove, and the position of the low end is flush with the groove bottom of the first groove; thereby, the glue injection channel has a smooth transition with spatial twisting at the corresponding position.

[0023] In the base, a glue leakage prevention groove is provided at the edge of the base corresponding to the outer side of the inclined surface convex portion, and the glue leakage prevention groove covers the inclined surface convex portion in the length direction; in the cover plate, a glue leakage prevention rib is provided at a position corresponding to the glue leakage prevention groove of the base; through the cooperation between the glue leakage prevention rib of the cover plate and the glue leakage prevention groove of the base, the glue at the junction of the first glue injection channel and the second glue injection channel is prevented from leaking to the outside.

[0024] In the base, at a position corresponding to the end of the glue flow of the second glue injection channel, the outer side of the second protrusion is set as a slope, so that the second glue injection channel is inclined outward at this position; the base is also provided with a glue guide groove connected to the outward inclined part of the second glue injection channel, so as to guide out bubbles generated when injecting glue in the glue injection channel.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. The present invention employs a method in which at least two first retaining walls are provided extending from a first side inner wall of the housing toward the region between the mating position of the static contact of one conductor and the mating position of the corresponding movable contact of the other conductor, thereby forming a recess between two adjacent first retaining walls; and at least one second retaining wall is provided extending toward the region from a second side inner wall of the housing, opposite the first side inner wall, wherein the extended end of the second retaining wall abuts against or is inserted into the opening of the corresponding recess. The second retaining wall cooperates with the opening of the corresponding recess to prevent splashes generated by the movable and static contacts under the action of an arc from entering the corresponding recess, thereby forming a clean area in the corresponding recess and effectively blocking the breakdown voltage between the two conductors. This structure of the present invention can effectively block the breakdown voltage between two unconnected conductive elements, thereby improving the breakdown voltage resistance of the switch.

[0027] 2. The present invention adopts a method in which a first groove is provided in the base at an edge thereof corresponding to an area where the lead terminals are distributed, the first groove is provided along the edge direction and has a relatively deep depth and passes through each lead terminal; a first protrusion is provided in the cover at a position corresponding to the first groove, and the first protrusion cooperates with the first groove to form a first glue injection channel with a relatively deep depth; a second groove is provided in the cover at an edge thereof corresponding to an area where the lead terminals are not distributed, the second groove is provided along the edge direction and has a relatively shallow depth; a second protrusion is provided in the base at a position corresponding to the second groove, and the second protrusion cooperates with the second groove to form a second glue injection channel with a relatively shallow depth; two ends of the first protrusion are respectively arranged to be in contact with two ends of the second groove, so that the first glue injection channel and the second glue injection channel are in contact with each other to form a glue injection channel that surrounds the entire edge of the base and the cover and wraps around the core component; the glue injection channel is provided with at least one glue injection port leading to the outside, so that sealant is injected into the glue injection channel by using the glue injection port to form a cured plastic sealing body in the glue injection channel, thereby realizing plastic sealing of the core component. This structure of the present invention can eliminate the disadvantages of the prior art, such as low production efficiency, the product's plastic sealing ability failing to meet requirements, and glue easily overflowing and contaminating the internal movement, and has the characteristics of high production efficiency and good plastic sealing performance reliability.

[0028] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments; however, the voltage breakdown resistant structure of a switch and the injection-molded plastic-sealed switch of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 Schematic diagram of a voltage breakdown withstand structure of a switch according to a first embodiment of the present invention;

[0030] Figure 2 It is along Figure 1 The cross-sectional view of line AA in FIG;

[0031] Figure 3 Schematic diagram of the voltage breakdown withstand structure of the switch according to the first embodiment of the present invention (showing the splash spray range);

[0032] Figure 4 It is along Figure 3 A cross-sectional view of line BB in FIG (showing the splash spray range and the clean area);

[0033] Figure 5 This is a schematic diagram of the exploded three-dimensional structure of the injection-molded plastic-sealed switch according to the second embodiment of the present invention;

[0034] Figure 6 This is a front view of a second embodiment of the present invention's plastic-encapsulated switch;

[0035] Figure 7 It is along Figure 6 Cross-sectional view of line CC in FIG;

[0036] Figure 8 This is a schematic diagram of the coordination of the core components, lead terminals, and isolation bosses of the injection-molded plastic-sealed switch according to the second embodiment of the present invention;

[0037] Figure 9 It is along Figure 8 The cross-sectional view of the KK line in FIG;

[0038] Figure 10 3D schematic diagram of a plastic-encapsulated switch according to a second embodiment of the present invention;

[0039] Figure 11 2 is a schematic diagram of the distribution of glue filling in the glue injection channel of the glue injection plastic sealed switch according to the second embodiment of the present invention;

[0040] Figure 12 Schematic diagram of the distribution of glue filling in the first groove of the base of the glue injection plastic sealed switch according to the second embodiment of the present invention;

[0041] Figure 13 Schematic diagram of the distribution of filling in the second groove of the cover plate of the injection-molded plastic-sealed switch according to the second embodiment of the present invention;

[0042] Figure 14 1 is a top view of a plastic-encapsulated switch according to a second embodiment of the present invention;

[0043] Figure 15 It is along Figure 14 Cross-sectional view of line DD in FIG;

[0044] Figure 16 It is along Figure 14 A cross-sectional view of line EE in FIG;

[0045] Figure 17 It is along Figure 14 Cross-sectional view of line FF in FIG;

[0046] Figure 18 1 is a schematic diagram of the three-dimensional structure of the base of the injection-molded plastic-sealed switch according to the second embodiment of the present invention;

[0047] Figure 19 1 is a schematic diagram of the three-dimensional structure of the cover plate of the injection-molded plastic-sealed switch according to the second embodiment of the present invention;

[0048] Figure 20 1 is a schematic diagram of the three-dimensional structure of the plastic-sealed body of the injection-molded plastic-sealed switch according to the second embodiment of the present invention;

[0049] Figure 21This is a schematic diagram of the matching of the base, cover plate and lead terminals of the injection-molded plastic-sealed switch according to the second embodiment of the present invention;

[0050] Figure 22 It is along Figure 21 Cross-sectional view of line GG in FIG;

[0051] Figure 23 It is along Figure 21 A cross-sectional view of the HH line in FIG;

[0052] Figure 24 This is a schematic diagram of the three-dimensional structure of the base of the injection-molded plastic-sealed switch and the components mounted on the base according to the second embodiment of the present invention;

[0053] Figure 25 yes Figure 24 An enlarged schematic diagram of the J portion in FIG.

[0054] Figure 26 Schematic diagram of the flow of glue for injection molding of a plastic-sealed switch according to the second embodiment of the present invention;

[0055] Figure 27 It is a three-dimensional schematic diagram of another arrangement of the glue injection port of the glue injection plastic sealed switch according to the second embodiment of the present invention. DETAILED DESCRIPTION

[0056] Example 1

[0057] See also Figures 1 to 4As shown, a voltage breakdown resistance structure of a switch of the present invention comprises a housing 1, two conductors 21 and 22 which are not electrically connected to each other and are provided with static contacts 20 installed in the housing 1, and a movable contact 30 which is adapted to the static contacts in the housing 1; in this embodiment, the movable contact 30 is provided on the movable contact assembly 3, and the movable contact assembly 3 adopts a bridge-type movable spring 31, and the movable contact 30 is provided at both ends of the bridge-type movable spring 31, and the conductor 21 and the conductor 22 are two lead-out terminals used to cooperate with the movable contact of the movable contact assembly 3 to realize the normally closed mode and the normally open mode; in the area between the matching position of the static contact 20 of one conductor 21 and the corresponding movable contact 30 to the matching position of the static contact 20 of the other conductor 22 and the corresponding movable contact 30, the first side inner wall 11 of the housing 1 extends to the said area Two first retaining walls 41 are extended from the domain to form a recess 40 between two adjacent first retaining walls 41 of the first side inner wall 11; in the second side inner wall 12 of the shell 1 opposite to the first side inner wall 11, a second retaining wall 42 is extended toward the region, and the extended end of the second retaining wall 42 reaches or is inserted into the opening of the recess 40 of the first side inner wall 11, so as to utilize the cooperation of the second retaining wall 42 of the second side inner wall 12 at the opening of the recess 40 of the first side inner wall 11 to prevent the splashes generated by the moving contact 30 and the static contact 20 under the action of the arc from entering the recess 40 of the first side inner wall 11, thereby forming a clean area 43 in the recess 40 of the first side inner wall 11, effectively blocking the voltage breakdown between the two conductors 21 and 22, thereby further improving the voltage resistance of the switch.

[0058] Furthermore, in the second side inner wall 12 of the shell 1, two first retaining walls 41 are extended toward the area to form a recess 40 between the two adjacent first retaining walls 41 of the second side inner wall 12; in the first side inner wall 11 of the shell 1, a second retaining wall 42 is extended toward the area, and the extended end of the second retaining wall 42 of the first side inner wall 11 of the shell reaches or is inserted into the opening of the corresponding recess 40 of the second side inner wall 12, so as to utilize the cooperation of the second retaining wall 42 of the first side inner wall 11 at the opening of the recess 40 of the second side inner wall 12 to prevent the splashes generated by the moving contact 30 and the static contact 20 under the action of the arc from entering the recess 40 of the second side inner wall 12, thereby forming a clean area 44 in the recess 40 of the second side inner wall 11, effectively blocking the voltage breakdown between the two conductors 21 and 22.

[0059] In this embodiment, in the first side inner wall 11 of the shell, the second retaining wall 42 of the first side inner wall 11 is arranged in the recess 40 of the first side inner wall 11 of the shell; in the second side inner wall 12 of the shell 1, the second retaining wall 42 of the second side inner wall 12 is arranged in the recess 40 of the second side inner wall 12 of the shell.

[0060] In this embodiment, the two first retaining walls 41 of the first side inner wall 11 of the shell 1 and the two first retaining walls 41 of the second side inner wall 12 of the shell 1 are arranged opposite to each other, and the extended ends of the two first retaining walls 41 of the first side inner wall 11 of the shell 1 and the extended ends of the two first retaining walls 41 of the second side inner wall 12 of the shell 1 are close to each other; the second retaining wall 42 of the first side inner wall 11 of the shell 1 and the second retaining wall 42 of the second side inner wall 12 of the shell 1 are staggered and inserted.

[0061] In this embodiment, the two first retaining walls 41 and one second retaining wall 42 of the first side inner wall 11 of the shell 1 are arranged in parallel, and the two first retaining walls 41 and one second retaining wall 42 of the second side inner wall 12 of the shell 1 are also arranged in parallel.

[0062] A voltage breakdown withstand structure of a switch of the present invention adopts a method in which two first retaining walls 41 are extended from the first side inner wall 11 of the housing 1 toward the area between the mating position of the static contact 20 of one conductor 21 and the corresponding moving contact 30 to the mating position of the static contact 20 and the corresponding moving contact 30 of the other conductor 22, so as to form a recess 40 between the two adjacent first retaining walls 41; a second retaining wall 42 is extended toward the area in the second side inner wall 12 of the housing 1 opposite to the first side inner wall, and the extended end of the second retaining wall 42 abuts or is inserted into the opening of the corresponding recess 40, so that the second retaining wall 42 cooperates with the opening of the corresponding recess 40 to prevent splashes generated by the moving contact 30 and the static contact 20 under the action of the arc from entering the corresponding recess 40, thereby forming a clean area 43 in the corresponding recess 40, effectively blocking the voltage breakdown between the two conductors 21 and 22. The structure of the present invention can effectively block the voltage breakdown between two unconnected conductive elements, thereby improving the voltage breakdown resistance of the switch.

[0063] Example 2

[0064] See also Figures 5 to 9 And refer to Figures 1 to 4As shown, a glue-injected plastic-sealed switch of the present invention includes a cover plate 5, a base 6, a core component, a lead-out terminal and a voltage-resistant breakdown structure of the above-mentioned switch; this embodiment is a snap-action switch, the base 6 is provided with a concave cavity surrounded by four side walls 61 and a bottom wall 62, the cover plate 5 is fixed on the concave cavity of the base 6 and forms the shell 1 in Example 1 with the base 6, the bottom wall 62 of the base 6 is the first side inner wall 11 of the shell 1, and the inner side of the cover plate 5 is the second side inner wall 12 of the shell 1; the core component is equivalent to the moving contact assembly 3 in Example 1, the core component 3 is installed in the concave cavity, and the moving contact 30 is provided on the core component 3; the two conductors 21 and 22 installed in the shell that are not electrically connected to each other and are provided with static contacts are two lead-out terminals 2 assembled on the side of the base 6 for cooperating with the moving contact 30 of the core component 3 to realize normally closed mode and normally open mode.

[0065] In this embodiment, in the bottom wall 62 of the base 6, two first retaining walls 41 are extended from the mating position of the static contact 20 of one lead-out terminal 21 and the corresponding moving contact 30 to the mating position of the static contact 20 of the other lead-out terminal 22 and the corresponding moving contact 30 to form a recess 40 between the two first retaining walls 41, and a second retaining wall 42 is further extended from the bottom wall 62 of the base 6 toward the said area, and the second retaining wall 42 of the base 6 is arranged in the recess 40 of the bottom wall 62 of the base 6; on the inner side of the cover plate 5, two first retaining walls 41 are extended toward the said area to form a recess 40 between the two first retaining walls 41, and a second retaining wall 42 is further extended from the inner side of the cover plate 5 toward the said area, and the second retaining wall of the cover plate 5 is arranged in the recess 40 of the cover plate 5.

[0066] In this embodiment, the two first retaining walls 41 of the bottom wall 62 of the base 6 are arranged opposite to the two first retaining walls 41 on the inner side of the cover plate 5, and the extended ends of the two first retaining walls 41 of the bottom wall 62 of the base 6 are close to the extended ends of the two first retaining walls 41 on the inner side of the cover plate 5; the second retaining wall 42 of the bottom wall 62 of the base 6 is staggered and inserted into the second retaining wall 42 on the inner side of the cover plate 5.

[0067] In this embodiment, the two first retaining walls 41 and one second retaining wall 42 of the bottom wall 62 of the base 6 are arranged in parallel, and the two first retaining walls 41 and one second retaining wall 42 on the inner side of the cover plate 5 are also arranged in parallel.

[0068] In this embodiment, in the inner wall of the shell corresponding to the area between the mating position of the static contact 20 of one lead terminal 21 and the corresponding moving contact 30 to the mating position of the static contact 20 of the other lead terminal 22 and the corresponding moving contact 30, two recesses 63 are further provided at the position corresponding to the first retaining wall 41 to the conductors 21 and 22 to increase the creepage distance; in this embodiment, the recess 63 is set on the base 6, specifically, on the bottom wall 62 and one of the side walls 61 of the base 6. Of course, it can also be set on the inner side of the cover plate 5.

[0069] In this embodiment, in the bottom wall 62 of the base 6, one of the two first retaining walls 41 and the second retaining wall 42 are connected as one piece; on the inner side of the cover plate 5, one of the two first retaining walls 41 and the second retaining wall 42 are also connected as one piece.

[0070] In this embodiment, at the insertion point of the first retaining wall 41 and the second retaining wall 42, the opposite surface thereof is set as a local inclined surface. Similarly, at the insertion point of the two second retaining walls 42, the opposite surface thereof is also set as a local inclined surface.

[0071] In this embodiment, one of the lead terminals 21 is a normally open lead terminal, and the other lead terminal 22 is a normally closed lead terminal. The two sides of the base 6 are respectively equipped with the normally open lead terminal 21 and the normally closed lead terminal 22, and a total of four lead terminals are installed on the base 6; the movement component has a normally open dynamic reed 311 and a normally closed dynamic reed 312, and the two ends of the normally open dynamic reed 311 and the normally closed dynamic reed 312 respectively correspond to the normally open lead terminal 21 and the normally closed lead terminal 22 on the two sides of the base 6; the bottom wall 62 of the base 6 is provided with an isolation boss 621, and the isolation boss 621 is located at a position corresponding to the end of the normally open dynamic reed 311 and the end of the normally closed dynamic reed 312; the first retaining wall 41 in the bottom wall 62 of the base 6 reaches or approaches the isolation boss 621 in width.

[0072] In this embodiment, a recess 6211 for increasing the creepage distance is provided on the isolation boss 621, and a preset gap is provided between the second retaining wall 42 in the bottom wall 62 of the base 6 and the isolation boss 621 in width. In this way, the first retaining wall 41 is longer in width than the second retaining wall 42, and the width of the retaining wall refers to the direction of the line connecting the two normally open contacts on the normally open spring.

[0073] In this embodiment, the first retaining wall 41 and the second retaining wall 42 are further connected to one of the side walls 61 of the base 6 in the width direction.

[0074] See also Figures 10 to 27As shown (in order to better demonstrate the injection molding structure of the present invention, a injection molding type switch of the present invention, the core component 3 is installed in the base 6; the four lead terminals 2 are respectively inserted into the interior of the base 6 and extend from the two side edges of the base 6, and the inner ends of the four lead terminals 2 are respectively matched with the core component 3; the cover plate 5 is fixed on the base 6 and encloses a cavity capable of housing the core component 3; in the base 6, in the area corresponding to the distribution of the lead terminals 2 (as shown in FIG. Figure 12 The lower half shown in the figure) is provided at the edge of the base 6, which is provided along the edge direction and has a relatively deep depth (relative to the second groove) and passes through the four lead terminals 2. In the cover plate 5, a first protrusion 51 is provided at a position corresponding to the first groove 64. Since the first groove 64 is in the lower half of the base 6, the first protrusion 51 of the cover plate 5 is also in the lower half of the cover plate 5 (as shown in the figure). Figure 13 As shown), the first protrusion 51 cooperates with the first groove 64 to form a first injection channel 71 with a relatively deep depth (relative to the second injection channel); in the cover plate 5, in the area corresponding to the area where the lead terminals are not distributed (such as Figure 13 A second groove 52 having a relatively shallow depth (relative to the first groove) is provided at the edge of the cover plate 5 in the upper half shown in the figure. In the base 6, a second protrusion 65 is provided at a position corresponding to the second groove 52, so that the second protrusion 65 cooperates with the second groove 52 to form a second injection channel 72 having a relatively shallow depth (relative to the first injection channel); the two ends of the first protrusion 51 are respectively connected to the two ends of the second groove 52, so that the first injection channel 71 and the second injection channel 72 are connected to form a glue injection channel 7 (as shown in the figure) surrounding the entire edge of the cover plate 5 and the base 6 and surrounding the core component 3. Figure 11 、 Figure 12 、 Figure 13 As shown), the injection channel 7 is provided with at least one injection port 74 leading to the outside, so as to inject the sealant 80 into the injection channel 7 by using the injection port 74 and form a cured plastic package 73 in the injection channel (as shown). Figure 20 As shown), thereby achieving plastic sealing of the core component 3.

[0075] In this embodiment, the cover plate 5 is further provided with a third protrusion 53 along the setting direction of the second groove 52 , and the second groove 52 is provided in the third protrusion 53 .

[0076] In this embodiment, Figure 14 、 Figure 15As shown, there are two glue injection ports 74, and the two glue injection ports 74 are respectively arranged at the positions of the cover plate 5 corresponding to the first glue injection channel 71; the glue injection port 74 includes a mouth 541 and a connecting channel 542; the mouth 541 is trumpet-shaped; the large end of the trumpet-shaped mouth 541 is located on the outer side of the cover plate 5; the small end of the trumpet-shaped mouth 541 is connected to one end of the connecting channel 542; the other end of the connecting channel 542 passes through the first protrusion 51 and is connected to the first glue injection channel 71.

[0077] Of course, if Figure 27 As shown, the glue injection port 74 can also be arranged at a position in the base 6 corresponding to the first glue injection channel 71; similarly, the glue injection port includes a mouth and a connecting channel; the mouth is trumpet-shaped; the large end of the trumpet shape of the mouth is on the outer side of the base; the small end of the trumpet shape of the mouth is connected to one end of the connecting channel; the other end of the connecting channel passes into the first groove and is connected to the first glue injection channel.

[0078] Of course, the injection port may also adopt other shapes.

[0079] In this embodiment, Figure 21 、 Figure 22 、 Figure 23As shown, the four lead terminals 2 are respectively located on both sides of the base 6, and at the installation positions of the two lead terminals 21, in the lead terminal 21, at the position corresponding to the position passing through the first groove 64, and in the middle of the lead terminal 21, a through hole 211 is provided to allow the sealant to pass through, and at the position corresponding to the position passing through the first groove 64, and on both sides of the width of the lead terminal 21, a recess 212 is provided to allow the sealant to pass through from both sides of the width of the lead terminal; and in the base 6 and the cover plate 5, at the positions corresponding to the recess 212 of the lead terminal 21, there are respectively provided convex portions, namely the convex portion 66 of the base 6 and the convex portion 55 of the cover plate 5; the convex portion 66 of the base 6 and the recess 212 of the lead terminal 21, as well as the convex portion 55 of the cover plate 5 and the recess 212 of the lead terminal 21, there are gaps to form through holes for the sealant to flow through. At the installation location of the other two lead terminals 22, a through hole 221 is provided in the middle of the lead terminal at a position corresponding to the first groove 64, allowing the passage of sealant. The base 6 and cover plate 3 are also provided with recessed portions, namely the recessed portion 67 of the base 6 and the recessed portion 56 of the cover plate 5, at positions corresponding to the width of the lead terminal passing through the first groove, to allow the passage of sealant from both sides of the width of the lead terminal. The provision of a through hole in the middle of the lead terminal and the provision of channels allowing the passage of sealant on both sides of the width of the lead terminal 2 can, on the one hand, facilitate the flow of sealant, and on the other hand, facilitate the sealing of the junction between the lead terminal 2, the base 6, and the cover plate 5, thereby achieving overall sealing of the product.

[0080] In this embodiment, the base 6 is provided with an inclined convex portion 68 at the junction of the two ends of the first groove 64 and the two ends of the second protrusion 65; the upper end of the inclined convex portion 68 is connected to the second protrusion 65, and the upper end is flush with the top surface of the protrusion of the second protrusion 65; the lower end of the inclined convex portion 68 is connected to the first groove 64, and the lower end is flush with the bottom of the groove of the first groove 64; thereby, the glue injection channel 7 is designed to have a smooth transition in spatial torsion at the corresponding position. Since the first groove 64 is a deep groove and the second groove 52 is a shallow groove, the first glue injection channel 71 is deeper and the second glue injection channel 72 is shallower, making the entire glue injection channel 7 have a staggered and winding shape. In order to avoid the sealant not filling the entire glue injection channel 7 during the glue injection process, the glue injection channel 7 needs to be designed with a smooth transition in spatial torsion to ensure smooth flow of the sealant.

[0081] In this embodiment, the base 6 is provided with a glue-leakage prevention groove 69 at the outer edge of the base 6 corresponding to the inclined protrusion 68, and the glue-leakage prevention groove 69 covers the inclined protrusion 68 in the longitudinal direction. The cover plate 5 is provided with a glue-leakage prevention rib 57 at a position corresponding to the glue-leakage prevention groove 69 of the base 6. The glue-leakage prevention rib 57 of the cover plate 5 cooperates with the glue-leakage prevention groove 69 of the base 6 to prevent glue from leaking outward at the junction of the first glue injection channel 71 and the second glue injection channel 72. Because the sealant needs to climb when entering the second glue injection channel 72 from the first glue injection channel 71, the increased injection pressure in the climbing area can cause glue to leak from the side. Therefore, it is necessary to provide a glue-leakage prevention structure at this location. On the one hand, it can provide a buffer for the sealant at this location during the injection process, and on the other hand, it can effectively prevent the sealant from leaking from the side.

[0082] In this embodiment, Figure 17 、 Figure 24 、 Figure 25 As shown, in the base 6, at the position corresponding to the end of the glue flow of the second glue injection channel 72, the outer side of the second protrusion 65 is set as an inclined surface 651, so that the second glue injection channel 72 is inclined outward at this position; the base 6 is also provided with a glue guide groove 691 connected to the outward inclined portion of the second glue injection channel 72 to guide out bubbles generated during glue injection in the glue injection channel 7. Figure 26 As shown, during glue injection, the glue of the two glue injection ports 74 moves to both sides and finally intersects at two positions in the upper and lower parts. Since there is air in the glue injection channel 7, bubbles will be generated at the end of the glue flow (i.e., the glue intersection). Since the glue groove at bubble 1 is deeper, the bubbles are deeply wrapped by the glue, so bubble 1 has no effect on the plastic sealing performance of the product. However, the glue groove at bubble 2 is shallow, and the bubbles generated will cause the product to leak, and the plastic sealing ability will not meet the requirements. Therefore, a glue injection channel exhaust structure is set at bubble 2, so that the glue injection channel at bubble 2 is tilted outward to form an oblique angle, and a glue guide groove is provided on the inclined side, through which glue and bubbles are discharged to the glue guide groove, so that the glue injection channel does not produce bubbles 2, and plastic sealing reliability is achieved. Of course, one or more glue guide grooves can be set.

[0083] The present invention relates to a mechanical switch for injection molding, wherein a first groove 64 is provided in the base 6 at an edge corresponding to an area where lead terminals are distributed, and which is relatively deep and passes through each lead terminal. A first protrusion 51 is provided in the cover 5 at a position corresponding to the first groove, and the first protrusion 51 cooperates with the first groove 64 to form a first injection channel 71 with a relatively deep depth. A second groove 52 is provided in the base 6 at an edge corresponding to an area where no lead terminals are distributed, and a second groove 52 is provided in the base 6 at a position corresponding to the first groove. A second protrusion 65 is provided at the position of the second groove, and the second protrusion 65 cooperates with the second groove 52 to form a second glue injection channel 72 of relatively shallow depth; the two ends of the first protrusion are respectively arranged to be connected with the two ends of the second groove, so that the first glue injection channel 71 and the second glue injection channel 72 are connected to form a glue injection channel 7 that surrounds the entire edge of the cover plate 5 and the base 6 and surrounds the core component 3. The glue injection channel 7 is provided with at least one glue injection port 74 leading to the outside, so that the sealant is injected into the glue injection channel 7 through the glue injection port 74 to form a solidified plastic sealing body 73 in the glue injection channel, thereby achieving plastic sealing of the core component 3. This structure of the present invention can eliminate the disadvantages of low production efficiency, the product's easy failure to meet the plastic sealing requirements, and the glue's easy overflow that contaminates the internal movement in the prior art, and has the characteristics of high production efficiency and good plastic sealing performance reliability.

[0084] 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 terms of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art can, without departing from the scope of the technical solution of the present invention, use the technical content disclosed above to make many possible changes and modifications to the technical solution of the present invention, or modify it into an equivalent equivalent embodiment. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on 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 voltage breakdown resistant structure for a switch, comprising a housing, two electrically non-connected conductive bodies provided with static contacts mounted within the housing, and a movable contact adapted to correspond to the static contacts within the housing; characterized in that: In an area between the mating position of the static contact and the corresponding movable contact of one conductor and the mating position of the static contact and the corresponding movable contact of the other conductor, at least two first retaining walls are extended from the first side inner wall of the housing toward the area to form a recess between two adjacent first retaining walls; at least one second retaining wall is extended from the second side inner wall of the housing opposite to the first side inner wall toward the area, the extended end of the second retaining wall abutting or inserting into the opening of the corresponding recess; at least two first retaining walls are further extended from the second side inner wall of the housing toward the area to form a recess between two adjacent first retaining walls, the second retaining wall being disposed in the recess of the second side inner wall; the first retaining wall extends from a side wall of the housing connected to the first side inner wall and the second side inner wall toward the area and exceeds the mating position of the static contact and the corresponding movable contact of the conductor, so that the second retaining wall, in engagement with the opening of the corresponding recess, prevents splashes generated by the movable contact and the static contact under the action of the arc from entering the corresponding recess, thereby forming a clean area in the corresponding recess and effectively blocking the withstand voltage breakdown between the two conductors.

2. The voltage breakdown withstand structure of a switch according to claim 1, characterized in that: Furthermore, at least one second retaining wall is extended toward the region in the first side inner wall of the shell, and the extended end of the second retaining wall of the first side inner wall of the shell reaches or is inserted into the opening of the corresponding recess of the second side inner wall.

3. The voltage breakdown withstand structure of a switch according to claim 2, characterized in that: In the inner wall of the shell corresponding to the area between the mating position of the static contact and the corresponding moving contact of one conductor and the mating position of the static contact and the corresponding moving contact of the other conductor, at least one recess is provided in the position corresponding to the first barrier wall to the conductor to increase the creepage distance.

4. The voltage breakdown withstand structure of a switch according to claim 2, characterized in that: In the first side inner wall of the shell, two first retaining walls are extended toward the area to form a recess between the two first retaining walls. The first side inner wall of the shell is also provided with a second retaining wall extending toward the area, and the second retaining wall is provided in the recess of the first side inner wall of the shell; in the second side inner wall of the shell, two first retaining walls are extended toward the area to form a recess between the two first retaining walls. The second side inner wall of the shell is also provided with a second retaining wall extending toward the area, and the second retaining wall is provided in the recess of the second side inner wall of the shell.

5. The voltage breakdown withstand structure of a switch according to claim 4, characterized in that: The two first retaining walls of the first side inner wall of the shell are arranged opposite to the two first retaining walls of the second side inner wall of the shell, and the extended ends of the two first retaining walls of the first side inner wall of the shell are close to the extended ends of the two first retaining walls of the second side inner wall of the shell; the second retaining wall of the first side inner wall of the shell is staggered and inserted into the second retaining wall of the second side inner wall of the shell.

6. The voltage breakdown withstand structure of a switch according to claim 5, characterized in that: The two first retaining walls and one second retaining wall of the first side inner wall of the shell are arranged in parallel, and the two first retaining walls and one second retaining wall of the second side inner wall of the shell are also arranged in parallel.

7. The voltage breakdown withstand structure of a switch according to claim 6, characterized in that: In the first side inner wall of the shell and / or the second side inner wall of the shell, one of the two first retaining walls is integrally connected to the second retaining wall on the same side inner wall, or both first retaining walls are spaced apart from the first retaining wall on the same side inner wall.

8. A plastic-sealed switch, characterized in that: It includes a cover plate, a base, a core component, a lead-out terminal and a voltage breakdown resistance structure as described in any one of claims 1 to 7; the base is provided with a concave cavity surrounded by four side walls and a bottom wall, the cover plate is fixed on the concave cavity of the base and forms the shell with the base, the bottom wall of the base is the first side inner wall of the shell, and the inner side of the cover plate is the second side inner wall of the shell; the core component is installed in the concave cavity, and the moving contact is provided on the core component; the two conductors installed in the shell that are not electrically connected to each other and are provided with static contacts are two lead-out terminals assembled on the side of the base for cooperating with the moving contact of the core component to realize normally closed mode and normally open mode.

9. The plastic-sealed switch according to claim 8, characterized in that: The two sides of the base are respectively equipped with normally closed lead terminals and normally open lead terminals; the movement component has a normally open dynamic reed and a normally closed dynamic reed, and the two ends of the normally open dynamic reed and the normally closed dynamic reed respectively match the normally open lead terminals and the normally closed lead terminals on the two sides of the base; the bottom wall of the base is provided with an isolation boss, and the isolation boss is located at a position corresponding to the end of the normally open dynamic reed and the end of the normally closed dynamic reed; the first retaining wall in the bottom wall of the base reaches or approaches the isolation boss in width.

10. The plastic-sealed switch according to claim 9, characterized in that: The isolation boss is provided with a notch for increasing the creepage distance, and a preset gap is provided between the second retaining wall in the bottom wall of the base and the isolation boss in width.

11. The plastic-sealed switch according to claim 8, characterized in that: In the base, a first groove is provided at an edge of the base corresponding to an area where the lead terminals are distributed, which is relatively deep and passes through each lead terminal. In the cover plate, a first protrusion is provided at a position corresponding to the first groove, so that a first glue injection channel with a relatively deep depth is formed by the cooperation of the first protrusion and the first groove; in the cover plate, a second groove is provided at an edge of the cover plate corresponding to an area where no lead terminals are distributed, which is relatively shallow and along the edge direction; in the base, a second protrusion is provided at a position corresponding to the second groove, so that a second glue injection channel with a relatively shallow depth is formed by the cooperation of the second protrusion and the second groove; two ends of the first protrusion are respectively connected to two ends of the second groove, so that the first glue injection channel and the second glue injection channel are connected to form a glue injection channel that surrounds the entire edge of the base and the cover plate and surrounds the core component; the glue injection channel is provided with at least one glue injection port leading to the outside, so that sealant is injected into the glue injection channel by the glue injection port to form a cured plastic sealing body in the glue injection channel, thereby realizing plastic sealing of the core component.

12. The plastic-sealed switch according to claim 11, characterized in that: In the cover plate, a third protrusion is further provided along the setting direction of the second groove, and the second groove is provided in the third protrusion.

13. The plastic-sealed switch according to claim 11, characterized in that: The glue injection port is arranged at a position in the cover plate corresponding to the first glue injection channel; the glue injection port includes a mouth and a connecting channel; the mouth is trumpet-shaped; the large end of the trumpet shape of the mouth is located on the outer side of the cover plate; the small end of the trumpet shape of the mouth is connected to one end of the connecting channel; the other end of the connecting channel passes through the first protrusion and is connected to the first glue injection channel.

14. The plastic-sealed switch according to claim 11, characterized in that: The glue injection port is arranged at a position in the base corresponding to the first glue injection channel; the glue injection port includes a mouth and a connecting channel; the mouth is trumpet-shaped; the large end of the trumpet shape of the mouth is located on the outer side of the base; the small end of the trumpet shape of the mouth is connected to one end of the connecting channel; the other end of the connecting channel passes into the first groove and is connected to the first glue injection channel.

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