Auxiliary contact and electrical switch

Abstract

The present application provides an auxiliary contact and an electrical switch, which belong to the technical field of electrical equipment. The auxiliary contact provided by the present application includes a shell and a contact support. An installation space is provided inside the shell. The contact support is slidably arranged in the installation space, and the contact support includes an end portion and a rod portion that are connected to each other. A first protrusion is provided at the end portion, and the first protrusion protrudes toward the mounting surface of the shell compared to the rod portion. The portion of the first protrusion facing the mounting surface is in sliding contact with the mounting surface, and there is a gap between the rod portion and the mounting surface. The present application provides a first protrusion at the end portion of the contact support, which can create a gap between the rod portion of the contact support and the mounting surface of the shell, reduce the friction area between the contact support and the mounting surface of the shell, thereby reducing the plastic particles generated during the movement of the contact support, and reduce the possibility of dust particles adhering to the moving contact and / or static contact, and contaminating or damaging the moving contact and / or static contact.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to an auxiliary contact and an electrical switch. Background Art

[0002] Auxiliary contacts are a common accessory in electrical switches. They are usually hung on the top or side of the contactor and move with the contactor. They are often used to control other electrical equipment or detect the working status of other circuits.

[0003] Frequent operation of the auxiliary contact causes wear between the auxiliary contact housing and the contact support, generating a large number of plastic particles. When these plastic particles fall between the movable and static contacts of the auxiliary contact and adhere to the contact surface, they can cause unreliable connection between the movable and static contacts, leading to premature failure of the auxiliary contact. Summary of the Invention

[0004] The present application provides an auxiliary contact and an electrical switch to reduce the possibility of dust particles adhering to a moving contact and / or a stationary contact.

[0005] In a first aspect, the present application provides an auxiliary contact, comprising a housing and a contact support. The housing defines a mounting space. The contact support is slidably disposed within the mounting space. The contact support comprises an interconnected end portion and a rod portion. The end portion is provided with a first protrusion, which protrudes toward the mounting surface of the housing relative to the rod portion. The portion of the first protrusion facing the mounting surface slides in contact with the mounting surface, leaving a gap between the rod portion and the mounting surface.

[0006] Through the above solution, the present application provides a first protrusion at the end of the contact support, and the first protrusion is arranged toward the mounting surface of the housing. When the contact support is installed in the housing, the presence of the first protrusion can create a gap between the rod portion of the contact support and the mounting surface of the housing, thereby reducing the contact area between the contact support and the mounting surface of the housing. When the contact support slides in the housing, only the first protrusion is in sliding contact with the mounting surface of the housing, thereby reducing the friction area between the contact support and the mounting surface of the housing. When the friction area between the contact support and the mounting surface of the housing is reduced, the plastic particles generated during the movement of the contact support will be reduced, thereby reducing the possibility of dust particles adhering to the moving contact and / or the static contact.

[0007] In one possible design, the auxiliary contact also includes a moving contact and a stationary contact. A sealed cavity is defined within the housing, with both the moving contact and the stationary contact located within the sealed cavity. The moving contact is connected to a rod, which can drive the moving contact within the sealed cavity toward or away from the stationary contact.

[0008] Through the above solution, the present application sets up a sealed cavity inside the housing, and both the moving contact and the static contact are located in the sealed cavity. On the basis of the protection provided by the housing for the moving contact and the static contact, the sealed cavity is used to provide secondary protection for the moving contact and the static contact. This can reduce the particles generated by the friction between the end of the contact support and the housing and fall onto the surface of the moving contact and / or the static contact. In addition, when the housing is not fully sealed or the housing ages and the sealing performance is reduced, the sealed cavity can also block dust particles in the external environment, thereby reducing the possibility of dust particles adhering to the moving contact and / or the static contact.

[0009] In one possible design, the housing includes a top cover and a base, with the mounting space located in the base. The housing's mounting surface includes a first wall and a second wall facing each other. The first wall is the side of the base facing the top cover, and the second wall is the side of the top cover facing the base. A shielding member is provided on the first wall, defining a first accommodating cavity. When the top cover and base are closed, the side of the shielding member facing the second wall abuts against the second wall, forming a sealed cavity within the first accommodating cavity.

[0010] With the above solution, since the installation space is located in the base, the shielding member can be disposed within the base. When the shielding member is disposed within the installation space of the base, the first wall, the second wall, and the shielding member can cooperate to form a sealed cavity, thereby eliminating the need for an additional baffle at the opening of the shielding member, thereby saving internal space in the housing.

[0011] In one possible design, a latch block is provided on the second wall, and a latch slot is provided on the side of the shielding member facing the second wall. When the top cover and the base are closed, the latch block and the latch slot engage. Alternatively, when the top cover and the base are closed, the shielding member and the second wall are connected by ultrasonic welding.

[0012] With the above solution, the top cover and the shielding member can be detachably connected by engaging the locking block with the locking slot. In this case, not only can the first accommodating chamber be sealed when the top cover and the base are closed, but also, when the movable contact or the stationary contact in the sealed chamber becomes aged or damaged and needs to be replaced, the top cover can be easily removed to replace or repair the movable contact or the stationary contact in the first accommodating chamber.

[0013] In addition, the top cover and the shielding member can be fixedly connected by ultrasonic welding. When the top cover and the shielding member are fixedly connected, the sealing effect of the sealed cavity is better, and dust particles from the outside are less likely to enter the sealed cavity. Moreover, because the shielding member is located in the installation space and the top cover is located on the installation space, the use of ultrasonic welding can make the fixed connection between the top cover and the shielding member even simpler.

[0014] In one possible design, the housing includes a top cover and a base, which together form an installation space. The housing's installation surface includes a first wall and a second wall, with the first wall being the side of the base facing the top cover, and the second wall being the side of the top cover facing the base. The first wall is provided with a shielding member defining a second accommodating cavity, and the second wall is provided with a mating member defining a third accommodating cavity. When the top cover and base are combined, the shielding member and the mating member abut against each other, combining the second and third accommodating cavities to form a sealed cavity.

[0015] Through the above solution, when the base is provided with an installation space, the shielding member can be set in the installation space of the base, and when the top cover is provided with an installation space, the matching member can be set in the installation space of the top cover. The first wall surface cooperates with the shielding member to form a second accommodating cavity, so there is no need to set an additional baffle to enable the shielding member to form the second accommodating cavity, thus saving the internal space of the base. The second wall surface cooperates with the matching member to form a third accommodating cavity, so there is no need to set an additional baffle to enable the matching member to form the third accommodating cavity, thus saving the internal space of the top cover. When the top cover is closed with the base, the shielding member cooperates with the matching member to combine the second accommodating cavity with the third accommodating cavity to form a sealed cavity, which can effectively shield the moving contact and the static contact in the sealed cavity.

[0016] In one possible design, the shielding member has a slot on its side facing the second wall, and the mating member has a block on its side facing the first wall. When the top cover and base are closed, the block engages with the slot. Alternatively, the shielding member and mating member are connected by ultrasonic welding.

[0017] With the above solution, the shielding member and the mating member can be detachably connected by engaging the locking block with the locking slot. In this case, after the top cover and the base are closed, the second and third accommodating cavities can be combined to form a sealed cavity. When the movable contact or the static contact in the sealed cavity becomes aged or damaged and needs to be replaced, the top cover and the base can be disassembled to separate the shielding member and the mating member, thereby making it easier to replace or repair the movable contact or the static contact in the sealed cavity.

[0018] In addition, ultrasonic welding can be used to securely connect the shielding member and the mating member. When the shielding member and the mating member are securely connected, the sealing effect of the sealed cavity is improved, and dust particles from the outside are less likely to enter the sealed cavity. Furthermore, since both the shielding member and the mating member are located within the installation space formed by the top cover and the base, ultrasonic welding can further simplify the secure connection between the shielding member and the mating member.

[0019] In a possible design, a guide groove is provided in the housing, the end portion is located in the guide groove, and the end portion is in sliding contact with a groove wall of the guide groove.

[0020] Through the above solution, a guide groove is provided within the housing, which can be used to guide the movement of the contact support, making the movement process of the contact support more stable. The end portion is located within the guide groove, and the end portion is in sliding contact with the groove wall of the guide groove. This not only improves the guiding effect of the guide groove, but also allows the plastic particles generated by the friction between the end portion and the groove wall of the guide groove during the movement of the contact support to be collected by the guide groove, reducing the possibility of plastic particles falling onto the moving contact and / or the static contact, thereby reducing the possibility of dust particles adhering to the moving contact and / or the static contact.

[0021] In one possible design, the end portion is further provided with two second protrusions, the two second protrusions being symmetrically arranged with the central axis of the rod portion as the axis of symmetry, the two second protrusions being respectively arranged toward two groove walls of the guide groove, and the two second protrusions being respectively in sliding contact with the corresponding groove walls.

[0022] Through the above solution, two second protrusions are provided at the end, and the two second protrusions are symmetrically arranged with the central axis of the rod as the axis of symmetry, which can make the contact support more stable during movement and reduce the probability of the contact support being offset toward the side without the second protrusion during movement due to the second protrusion being provided on only one side. The two second protrusions are in sliding contact with the corresponding groove walls, respectively, which can shift the friction area between the end and the guide groove away from the movement path of the contact support. In this way, the probability of the contact support causing plastic particles generated by the friction between the end and the guide groove to be carried along the movement path of the contact support to the moving contact and the static contact during movement can be reduced, thereby reducing the possibility of dust particles adhering to the moving contact and / or the static contact.

[0023] In a possible design, a material leakage port is further provided in the shell, and the material leakage port is communicated with the guide groove.

[0024] Through the above scheme, a leakage port is set in the shell, and the leakage port is communicated with the guide groove. When the contact support moves in the shell, the end portion rubs against the groove wall of the guide groove to produce plastic particles, and these plastic particles can fall through the leakage port. This can avoid excessive accumulation of plastic particles in the guide groove, and the probability of some plastic particles being carried to the moving contact and the static contact by the contact support when the contact support moves, thereby reducing the possibility of dust particles adhering to the moving contact and / or the static contact.

[0025] In a second aspect, the present application provides an electrical switch, which includes a contactor and the auxiliary contact mentioned in the first aspect, wherein the contactor is connected to the auxiliary contact.

[0026] The beneficial effects of the electrical switch provided in the second aspect can be referred to the beneficial effects brought about by the first aspect and the various possible implementation methods of the first aspect, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the overall structure of the auxiliary contact provided in an embodiment of the present application.

[0028] Figure 2 Schematic diagram of the internal structure of the auxiliary contact provided in an embodiment of the present application.

[0029] Figure 3 A schematic structural diagram of the contact support provided in an embodiment of the present application at one viewing angle.

[0030] Figure 4 A schematic structural diagram of the base provided in an embodiment of the present application.

[0031] Figure 5 A schematic structural diagram of the top cover provided in an embodiment of the present application.

[0032] Figure 6 This is an assembly diagram of the contact support and moving contact provided in an embodiment of the present application.

[0033] Figure 7 A schematic structural diagram of the contact support provided in an embodiment of the present application from another perspective.

[0034] Figure 8 for Figure 2 Magnified view of section A.

[0035] Description of reference numerals:

[0036] 100, housing; 110, sealing chamber; 120, top cover; 121, second wall; 122, fitting; 130, base; 131, first wall; 132, shielding member; 140, guide groove; 150, leakage port;

[0037] 200, contact support; 210, end; 211, first protrusion; 212, second protrusion; 220, rod;

[0038] 300, moving contact;

[0039] 400. Static contact. DETAILED DESCRIPTION

[0040] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used in the specification of the application herein are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0042] The terms "comprises", "comprising" and "having" and any variations thereof in the specification, claims and drawings of this application are intended to cover but not exclude other contents. The word "a" or "an" does not exclude the presence of a plurality.

[0043] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiment" in various places in the specification does not necessarily refer to the same embodiment, nor does it necessarily refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0044] The term "and / or" in this document simply describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0045] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the specific structure of the static contact of a circuit breaker and the circuit breaker of the present application. For example, in the description of the present application, the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., which indicate directions or positional relationships, are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present application.

[0046] In addition, the terms "first", "second", etc. in the description and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order, and may explicitly or implicitly include one or more such features.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, the "connection" or "connection" of a mechanical structure may refer to a physical connection. For example, the physical connection may be a fixed connection, such as a fixed connection through a fixing member, such as a fixed connection through a screw, bolt, or other fixing member; the physical connection may also be a detachable connection, such as a mutual snap connection or snap connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding, or integral molding. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] Contactors, a key component in automatic control systems, are widely used in various industrial control systems, such as motor control, lighting systems, heating devices, and fans. They are primarily used to remotely connect and disconnect AC or DC main circuits, as well as frequently start and control AC motors. Contactors control circuits by closing and opening contacts through the magnetic force generated by an electromagnetic coil.

[0049] Auxiliary contacts, a common accessory in electrical switches, are typically used in conjunction with contactors. The contactor housing typically has a slot, and a corresponding latch is located on the auxiliary contact housing. This latch engages the slot, connecting the auxiliary contact to the contactor. Auxiliary contacts can be used to control other electrical equipment or detect the operating status of other circuits.

[0050] In existing technology, auxiliary contacts typically operate along with the contactor. During use, the auxiliary contact's contact support rubs against the auxiliary contact housing, generating a large number of fine plastic particles. These fine particles can fall onto the moving and / or stationary contacts as the contact support moves, contaminating the contact points between the moving and stationary contacts. This increases the resistance between the two contacts and may cause the auxiliary contacts to fail.

[0051] Based on this, the present application provides an electrical switch comprising a contactor and an auxiliary contact, wherein the contactor is connected to the auxiliary contact. The auxiliary contact provided in the present application can reduce the likelihood of dust particles adhering to the moving contact and / or the stationary contact, thereby improving the reliability of the auxiliary contact. Thus, when the contactor to which the auxiliary contact is connected actuates, the auxiliary contact can respond more quickly, thereby improving the reliability of the electrical switch.

[0052] In order to enable those skilled in the art to better understand the solution of the present application, the auxiliary contacts mentioned in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0053] Figure 1 This is a schematic diagram of the overall structure of the auxiliary contact provided in an embodiment of the present application. Figure 2 Schematic diagram of the internal structure of the auxiliary contact provided in an embodiment of the present application. Figure 3 A schematic diagram of the structure of the contact support provided in the embodiment of the present application at a certain viewing angle. Figures 1 to 3 As shown, the present application provides an auxiliary contact, which includes a housing 100 and a contact support 200. The housing 100 has an interior provided with an installation space. The contact support 200 is slidably disposed within the installation space and includes an end portion 210 and a rod portion 220 that are interconnected. The end portion 210 has a first protrusion 211, which protrudes toward the mounting surface of the housing 100 relative to the rod portion 220. The portion of the first protrusion 211 that faces the mounting surface slides in contact with the mounting surface, leaving a gap between the rod portion 220 and the mounting surface.

[0054] Figure 4 A schematic structural diagram of the base provided in an embodiment of the present application. Figure 5 This is a schematic diagram of the structure of the top cover provided in the embodiment of the present application. Figure 1 、 Figure 4 as well as Figure 5 As shown, the housing 100 includes a top cover 120 and a base 130. When the top cover 120 and the base 130 are covered, they can form an installation space. The side of the base 130 facing the top cover 120 can be a first wall 131, and the side of the top cover 120 facing the base 130 can be a second wall 121. The first wall 131 and the second wall 121 can both serve as installation surfaces.

[0055] The contact support 200 is slidably disposed within the installation space. The contact support 200 may be cylindrical, with the middle portion of the contact support 200 being a rod 220, and the ends of the contact support 200 being end portions 210. The first protrusion 211 may be a block-shaped structure disposed on the end portion 210. The first protrusion 211 may be disposed in various configurations. The following examples illustrate various configurations of the first protrusion 211, but do not constitute a limitation on the technical solutions of this application.

[0056] In the first configuration, the first protrusion 211 is disposed on the side of the end portion 210 facing the first wall 131. The first protrusion 211 is in sliding contact with the first wall 131. In this configuration, a gap exists between the rod portion 220 and the first wall 131. When the contact support 200 moves within the housing 100, the rod portion 220 and the first wall 131 do not contact each other. This reduces the amount of plastic particles generated by friction between the contact support 200 and the first wall 131, and reduces the likelihood of dust particles adhering to the moving and / or stationary contacts.

[0057] In the second configuration, the first protrusion 211 is disposed on the side of the end portion 210 facing the second wall 121. The first protrusion 211 is in sliding contact with the second wall 121. In this configuration, a gap exists between the rod portion 220 and the second wall 121. When the contact support 200 moves within the housing 100, the rod portion 220 and the second wall 121 do not contact each other. This reduces the amount of plastic particles generated by friction between the contact support 200 and the second wall 121, and reduces the likelihood of dust particles adhering to the moving and / or stationary contacts.

[0058] A third configuration: The first protrusion 211 is disposed on the side of the end 210 facing the first wall 131, and the first protrusion 211 is also disposed on the side of the end 210 facing the second wall 121. In this configuration, the first protrusion 211 disposed toward the first wall 131 is in sliding contact with the first wall 131, and the first protrusion 211 disposed toward the second wall 121 is in sliding contact with the second wall 121. A gap exists between the rod 220 and the first wall 131, and between the rod 220 and the second wall 121. When the contact holder 200 moves within the housing 100, there is no contact between the rod 220 and the first wall 131, nor between the rod 220 and the second wall 121. This reduces the amount of plastic particles generated by friction between the contact holder 200 and the first wall 131, and between the contact holder 200 and the second wall 121, thereby reducing the likelihood of dust particles adhering to the moving and / or stationary contacts.

[0059] It can be seen that no matter which of the above-mentioned settings the first protrusion 211 adopts, when the portion of the first protrusion 211 facing the mounting surface is in sliding contact with the mounting surface, the first protrusion 211 can create a gap between the rod portion 220 and the mounting surface, and can also replace the rod portion 220 in sliding contact with the mounting surface, thereby avoiding the generation of more plastic particles due to the sliding contact between the larger area of ​​the rod portion 220 and the mounting surface.

[0060] It should be noted that both ends 210 of the contact support 200 can be provided with a first protrusion 211, so that when the contact support 200 moves relative to the housing 100, both ends 210 of the contact support 200 can abut against the mounting surface via the first protrusion 211. This can further reduce the contact area between the rod portion 220 and the mounting surface, thereby reducing the number of plastic particles generated by friction between the contact support 200 and the housing 100. Furthermore, when both ends 210 of the contact support 200 are provided with a first protrusion 211, the probability of the contact support 200 being tilted within the housing 100 due to the first protrusion 211 being provided on one side can be reduced, thereby increasing the stability of the contact support 200 during movement.

[0061] In addition, the size of the first protrusion 211 can be set to be smaller. In this way, when the first protrusion 211 replaces the rod portion 220 to slide in contact with the mounting surface, the contact area between the first protrusion 211 and the mounting surface is smaller, which facilitates reducing the number of plastic particles generated between the first protrusion 211 and the mounting surface during the movement of the contact support 200.

[0062] In summary, the present application provides a first protrusion 211 on the end 210 of the contact support 200, with the first protrusion 211 facing the mounting surface of the housing 100. When the contact support 200 is installed in the housing 100, the presence of the first protrusion 211 creates a gap between the rod portion 220 of the contact support 200 and the mounting surface of the housing 100, thereby reducing the contact area between the contact support 200 and the mounting surface of the housing 100. When the contact support 200 slides within the housing 100, only the first protrusion 211 is in sliding contact with the mounting surface of the housing 100, thereby reducing the friction area between the contact support 200 and the mounting surface of the housing 100. The reduced friction area between the contact support 200 and the mounting surface of the housing 100 reduces the amount of plastic particles generated during the movement of the contact support 200, thereby reducing the likelihood of dust particles adhering to the moving and / or stationary contacts.

[0063] As the operating environment of electrical switches becomes more complex and harsh, dust and other foreign matter in the external environment may enter the housing 100 of the auxiliary contact and fall onto the moving contact 300 and / or the static contact 400. These dust and foreign matter will also contaminate the contact points of the moving contact 300 and the static contact 400, thereby increasing the resistance between the moving contact 300 and the static contact 400, thereby causing the auxiliary contact to fail.

[0064] Based on this, the present application also makes improvements to the housing 100 of the auxiliary contact, which will be described in detail below with reference to the accompanying drawings.

[0065] Figure 6 This is an assembly diagram of the contact support and the moving contact provided in the embodiment of the present application. Figure 2 as well as Figure 6 As shown, the auxiliary contacts further include a movable contact 300 and a stationary contact 400. A sealed cavity 110 is defined within the housing 100, and both the movable contact 300 and the stationary contact 400 are located within the sealed cavity 110. The movable contact 300 is connected to a rod 220, which can drive the movable contact 300 to move within the sealed cavity 110, either away from or toward the stationary contact 400.

[0066] The sealed cavity 110 may be an independent space within the housing 100. The sealed cavity 110 may have a notch for the static contact 400 to extend into, so that the static contact point of the static contact 400 is located within the independent space. The sealed cavity 110 may also have a notch for the contact support 200 to be installed, so that the rod portion 220 of the contact support 200 is located within the independent space and the end portion 210 of the contact support 200 is located outside the independent space.

[0067] The rod portion 220 of the contact support 200 may be provided with a movable contact window. The movable contact bridge of the movable contact 300 is located within the movable contact window, and the movable contact point of the movable contact 300 is located outside the movable contact window. When the contact support 200 moves within the housing 100, the movable contact 300 can move with the rod portion 220 in a direction away from or toward the static contact 400, and the movable contact point is always located within the sealed cavity 110.

[0068] In summary, the present application sets a sealed cavity 110 inside the housing 100, and positions both the moving contact 300 and the static contact 400 within the sealed cavity 110. On the basis of the housing 100 providing protection for the moving contact 300 and the static contact 400, the sealed cavity 110 is used to provide secondary protection for the moving contact 300 and the static contact 400. This can reduce the particles generated by the friction between the end 210 of the contact support 200 and the housing 100 from falling onto the surfaces of the moving contact and / or the static contact. Furthermore, when the housing 100 is not fully sealed, or when the housing 100 ages and the sealing performance is reduced, the sealed cavity 110 can also block dust particles in the external environment, thereby reducing the possibility of dust particles adhering to the moving contact and / or the static contact.

[0069] There are many ways to set up the sealed cavity, and this application only introduces two of them in detail.

[0070] Based on the above description, the housing 100 includes a top cover 120 and a base 130. When the top cover 120 and the base 130 are combined, they form a mounting space. The side of the base 130 facing the top cover 120 may be a first wall 131, and the side of the top cover 120 facing the base 130 may be a second wall 121. Both the first wall 131 and the second wall 121 may serve as mounting surfaces.

[0071] In a first possible embodiment, Figure 2 、 Figure 4 as well as Figure 5 As shown, the mounting space may be located at the base 130 .

[0072] Based on this, the first wall 131 is provided with a shielding member 132, which has a first accommodating cavity. After the top cover 120 and the base 130 are covered, the side of the shielding member 132 facing the second wall 121 abuts against the second wall 121 to form a sealed cavity 110 at the first accommodating cavity.

[0073] The base 130 may include a bottom plate and four side plates, the four side plates are connected end to end and the four side plates are vertically connected to the bottom plate, the space enclosed by the four side plates and the bottom plate is the installation space, the top cover 120 may be plate-shaped, the first wall 131 may be the inner bottom surface of the base 130, and the second wall 121 may be the side wall of the top cover 120 facing the base 130.

[0074] The shielding member 132 can be a "mouth"-shaped structure formed by four baffles connected end to end. The opening on one side of the shielding member 132 is fixedly connected to the first wall 131, forming a first accommodating chamber within the "mouth"-shaped structure. Two opposing baffles within the "mouth"-shaped structure have notches in which the contact support 200 can be installed. When the top cover 120 and the base 130 are closed, the second wall 121 blocks the opening on the other side of the shielding member 132, forming the first accommodating chamber into a sealed chamber 110.

[0075] With the above arrangement, since the installation space is located in the base 130, the shielding member 132 can be disposed within the base 130. When the shielding member 132 is disposed within the installation space of the base 130, the first wall 131, the second wall 121, and the shielding member 132 can cooperate to form the sealed cavity 110. This eliminates the need for an additional baffle at the opening of the shielding member 132, thereby saving internal space within the housing 100.

[0076] It should be noted that, in this embodiment, not only can the shielding member 132 be provided on the first wall surface 131 as described above, but the shielding member 132 can also be provided on the second wall surface 121 .

[0077] Unlike when the shielding member 132 is located on the first wall 131, when the shielding member 132 is located on the second wall 121, the opening on one side of the shielding member 132 is fixedly connected to the second wall 121, so that the interior of the "mouth"-shaped structure forms a first accommodating chamber. The two opposing baffles in the "mouth"-shaped structure are provided with notches, and the contact support 200 can be installed in these notches. When the top cover 120 and the base 130 are covered, the notch on the shielding member 132 cooperates with the rod 220 of the contact support 200, so that the shielding member 132 covers the moving contact 300 and the static contact. The opening on the other side of the shielding member 132 is blocked by the first wall 131, thereby forming the first accommodating chamber into a sealed chamber 110.

[0078] In the first possible embodiment, when shielding member 132 is disposed on first wall 131, second wall 121 may be provided with a latch block, and a latch slot may be provided on the side of shielding member 132 facing second wall 121. When top cover 120 and base 130 are closed, the latch block and the latch slot engage. Alternatively, when top cover 120 and base 130 are closed, shielding member 132 and second wall 121 may be connected via ultrasonic welding.

[0079] The block may be a protrusion provided on the second wall 121 toward the first wall 131, and the slot may be a groove provided on the side of the shielding member 132 facing the second wall 121. A slot may also be provided on the second wall 121, and a block may also be provided on the side of the shielding member 132 facing the second wall 121.

[0080] Ultrasonic welding uses high-frequency vibration energy to join two or more pieces of thermoplastic material. During the welding process, ultrasonic vibrations are converted into mechanical vibrations by a transducer, which then transmits the vibration energy to the surface of the plastic material via a horn. When the vibration energy is high enough, frictional heat is generated on the surface of the plastic material, causing partial melting of the material. Upon cooling, the melted portion solidifies, forming a secure bond between the plastic materials.

[0081] In summary, the top cover 120 and the shielding member 132 can be detachably connected by engaging the locking block with the locking slot. In this case, not only can the first accommodating cavity form a sealed cavity 110 after the top cover 120 and the base 130 are covered, but also when the movable contact 300 or the static contact 400 in the sealed cavity 110 becomes aged or damaged and needs to be replaced, the top cover 120 can be easily removed to replace or repair the movable contact 300 or the static contact 400 in the first accommodating cavity.

[0082] Additionally, the top cover 120 and the shielding member 132 can be fixedly connected by ultrasonic welding. When the top cover 120 and the shielding member 132 are fixedly connected, the sealing effect of the sealed cavity 110 is improved, and dust particles from the outside are less likely to enter the sealed cavity 110. Furthermore, because the shielding member 132 is located within the installation space, and the top cover 120 is located on the installation space, the use of ultrasonic welding can further simplify the fixed connection between the top cover 120 and the shielding member 132.

[0083] Based on the first possible embodiment, when the shielding member 132 is disposed on the second wall 121, the first wall 131 may be provided with a block, and the side of the shielding member 132 facing the first wall 131 may be provided with a slot. Alternatively, the first wall 131 may be provided with a slot, and the side of the shielding member 132 facing the first wall 131 may be provided with a block, with the block engaging the slot. Alternatively, after the top cover 120 and the base 130 are closed, the shielding member 132 and the first wall 131 may be connected by ultrasonic welding.

[0084] The effect is the same as above and will not be repeated here.

[0085] In a second possible embodiment, the installation space is not only located in the base 130 , but may be formed after the top cover 120 and the base 130 are covered together. In other words, the installation space may be located in the top cover 120 and the base 130 .

[0086] Based on this, the first wall 131 is provided with a shielding member 132, the shielding member 132 has a second accommodating cavity, the second wall 121 is provided with a matching member 122, the matching member 122 has a third accommodating cavity, and after the top cover 120 and the base 130 are covered, the shielding member 132 and the matching member 122 abut against each other, so that the second accommodating cavity and the third accommodating cavity are combined to form a sealed cavity 110.

[0087] The top cover 120 has a relatively small installation space, and the base 130 also has a relatively small installation space. When the top cover 120 and the base 130 are covered, they can form a complete installation space in the housing 100. The first wall 131 can be the inner bottom surface of the base 130, and the second wall 121 can be the inner bottom surface of the top cover 120.

[0088] The structure of the shielding member 132 here is the same as the structure of the shielding member 132 mentioned above, so it will not be repeated here.

[0089] The fitting 122 can be a "mouth"-shaped structure formed by four baffles connected end to end. The opening on one side of the fitting 122 is fixedly connected to the second wall 121, so that the third accommodating cavity is formed within the "mouth"-shaped structure. The size and shape of the third accommodating cavity can be the same as the size and shape of the second accommodating cavity.

[0090] When the top cover 120 and the base 130 are covered, the side of the shielding member 132 facing the top cover 120 abuts against the side of the fitting member 122 facing the base 130 , so that the second accommodating cavity and the third accommodating cavity are combined to form the sealed cavity 110 .

[0091] In summary, when the base 130 has an installation space, the shielding member 132 can be disposed within the installation space of the base 130. When the top cover 120 has an installation space, the mating member 122 can be disposed within the installation space of the top cover 120. The first wall 131 cooperates with the shielding member 132 to form the second accommodating chamber, eliminating the need for an additional baffle to allow the shielding member 132 to form the second accommodating chamber, thereby saving space within the base 130. The second wall 121 cooperates with the mating member 122 to form the third accommodating chamber, thereby eliminating the need for an additional baffle to allow the mating member 122 to form the third accommodating chamber, thereby saving space within the top cover 120. When the top cover 120 and the base 130 are closed, the shielding member 132 cooperates with the mating member 122 to combine the second and third accommodating chambers to form the sealed chamber 110, effectively shielding the movable contact 300 and the stationary contact 400 within the sealed chamber 110.

[0092] In a second possible embodiment, a slot is provided on the side of the shielding member 132 facing the second wall 121, and a block is provided on the side of the mating member 122 facing the first wall 131. When the top cover 120 and the base 130 are closed, the block engages with the slot. Alternatively, the shielding member 132 and the mating member 122 are connected by ultrasonic welding.

[0093] The slot can be a groove structure provided on the side of the shielding member 132 facing the second wall surface 121, and the block can be a protrusion structure provided on the side of the matching member 122 facing the first wall surface 131. The side of the shielding member 132 facing the second wall surface 121 can also be provided with a block, and the side of the matching member 122 facing the first wall surface 131 can be provided with a slot.

[0094] Ultrasonic welding has been introduced in detail above and will not be repeated here.

[0095] In summary, the blocking member 132 and the mating member 122 can be detachably connected by engaging the locking block with the locking slot. In this case, after the top cover 120 and the base 130 are closed, the second accommodating cavity and the third accommodating cavity can be combined to form the sealed cavity 110. When the movable contact 300 or the static contact 400 in the sealed cavity 110 becomes aged or damaged and needs to be replaced, the top cover 120 and the base 130 can be disassembled to separate the blocking member 132 from the mating member 122, thereby allowing the movable contact 300 or the static contact 400 in the sealed cavity 110 to be replaced or repaired.

[0096] In addition, ultrasonic welding can be used to securely connect the shielding member 132 to the mating member 122. When the shielding member 132 and the mating member 122 are securely connected, the sealing effect of the sealed cavity 110 is improved, and dust particles from the outside are less likely to enter the sealed cavity 110. Moreover, since the shielding member 132 and the mating member 122 are both located within the installation space, which is formed by the top cover 120 and the base 130, ultrasonic welding can make the secure connection between the shielding member 132 and the mating member 122 even simpler.

[0097] like Figure 2 as well as Figure 4 As shown, a guide groove 140 is provided in the housing 100 , the end portion 210 is located in the guide groove 140 , and the end portion 210 is in sliding contact with the groove wall of the guide groove 140 .

[0098] In some possible designs, the guide groove 140 can be a groove structure provided on the first wall 131 and / or the second wall 121. The end portion 210 is slidably provided in the guide groove 140, and the side wall of the end portion 210 providing the moving contact window is in sliding contact with the groove wall of the guide groove 140.

[0099] In other possible designs, a guide block may be further provided in the base 130, and the guide groove 140 may be provided in the guide block in the base 130. Alternatively, a guide block may be provided in the top cover 120, and the guide groove 140 may be provided in the guide block in the top cover 120. Alternatively, guide blocks may be provided in both the base 130 and the top cover 120, and the guide groove 140 may be provided in both the guide block in the base 130 and the guide block in the top cover 120.

[0100] In summary, the guide groove 140 is provided within the housing 100, and can be utilized to guide the movement of the contact support 200, thereby making the movement of the contact support 200 more stable. The end portion 210 is located within the guide groove 140, and the end portion 210 is in sliding contact with the groove wall of the guide groove 140. This not only improves the guiding effect of the guide groove 140, but also allows the guide groove 140 to collect plastic particles generated by the friction between the end portion 210 and the groove wall of the guide groove 140 during the movement of the contact support 200, thereby reducing the possibility of plastic particles falling onto the moving contact and / or the stationary contact, thereby reducing the possibility of dust particles adhering to the moving contact and / or the stationary contact.

[0101] Figure 7 A schematic structural diagram of the contact support provided in an embodiment of the present application from another perspective. Figure 8 for Figure 2 Magnified view of part A in the figure. Figure 7 as well as Figure 8As shown, the end portion 210 is further provided with two second protrusions 212. The two second protrusions 212 are symmetrically arranged with the central axis of the rod portion 220 as the axis of symmetry, and the two second protrusions 212 are respectively arranged toward the two groove walls of the guide groove 140, and the two second protrusions 212 are respectively in sliding contact with the corresponding groove walls.

[0102] The two second protrusions 212 can both be block-shaped structures provided on the end portion 210. The two second protrusions 212 are respectively provided on the two side walls of the contact support 200 provided with the movable contact window. When the contact support 200 moves within the housing 100, the two second protrusions 212 respectively slide in contact with the corresponding groove walls, so that the guide groove 140 can guide the movement of the contact support 200.

[0103] In some possible designs, only one end portion 210 of the contact support 200 is provided with the second protrusion 212 .

[0104] In some other possible designs, the ends 210 on both sides of the contact support 200 are both provided with second protrusions 212 .

[0105] The above arrangement, in which two second protrusions 212 are provided on the end portion 210 and are symmetrically arranged about the central axis of the rod portion 220, makes the contact support 200 more stable during movement and reduces the probability of the contact support 200 being displaced toward the side without the second protrusion 212 during movement due to only having the second protrusion 212 on one side. The two second protrusions 212 respectively slide in contact with the corresponding groove walls, shifting the friction area between the end portion 210 and the guide groove 140 away from the movement path of the contact support 200. This reduces the probability of plastic particles generated by the friction between the end portion 210 and the guide groove 140 being carried along the movement path of the contact support 200 toward the movable contact 300 and the stationary contact 400 during movement of the contact support 200, thereby reducing the possibility of dust particles adhering to the movable and / or stationary contacts.

[0106] like Figure 2 、 Figure 4 as well as Figure 8 As shown, a material leakage port 150 is further provided in the housing 100 , and the material leakage port 150 is communicated with the guide groove 140 .

[0107] When the guide groove 140 is a groove provided on the housing 100, the leakage opening 150 may be a gap provided between the guide groove 140 and the shielding member 132. When a guide block is provided in the housing 100, the guide block is located on one side of the sealing cavity 110, and the guide groove 140 is provided in the guide block, the leakage opening 150 may be a gap between the guide block and the shielding member 132, or a gap between the guide block and the mating member 122, or a notch provided on the side wall of the guide block that connects to the guide groove 140.

[0108] In summary, the material leakage opening 150 is provided in the housing 100 and is in communication with the guide groove 140. When the contact support 200 moves within the housing 100, the end portion 210 rubs against the groove wall of the guide groove 140 to produce plastic particles, which can then fall through the material leakage opening 150. This prevents excessive accumulation of plastic particles within the guide groove 140, which could lead to some of the plastic particles being carried by the contact support 200 toward the moving contact 300 and the stationary contact 400 when the contact support 200 moves, thereby reducing the possibility of dust particles adhering to the moving and / or stationary contacts.

Claims

1. An auxiliary contact, characterized in that: include: A housing having an installation space therein, the housing comprising a top cover and a base, the installation space being located on the base; A contact support is slidably arranged in the installation space, and the contact support includes an end portion and a rod portion connected to each other; The end portion is provided with a first protrusion, which protrudes toward the mounting surface of the housing relative to the rod portion. The first protrusion is in sliding contact with the mounting surface at a portion facing the mounting surface, and a gap is formed between the rod portion and the mounting surface. A movable contact and a stationary contact, wherein a sealed cavity is provided inside the housing, and the movable contact and the stationary contact are both located in the sealed cavity, and the movable contact is connected to the rod portion, and the rod portion can drive the movable contact to move in the sealed cavity in a direction away from or close to the stationary contact; The mounting surface of the housing includes a first wall surface and a second wall surface that are opposite to each other, the first wall surface is a side of the base facing the top cover, and the second wall surface is a side of the top cover facing the base; The first wall is provided with a shielding member, which is a "mouth"-shaped structure formed by four baffles connected end to end. An opening on one side of the shielding member is fixedly connected to the first wall so that a first accommodating cavity is formed inside the "mouth"-shaped structure. When the top cover and the base are covered, the side of the shielding member facing the second wall abuts against the second wall to form the sealed cavity at the first accommodating cavity. A guide groove is provided in the shell, the end is located in the guide groove, and the end is in sliding contact with the groove wall of the guide groove. A leakage port is also provided in the shell, and the leakage port is a gap provided between the guide groove and the shielding member, and the leakage port is connected to the guide groove.

2. The auxiliary contact according to claim 1, characterized in that: The second wall surface is provided with a card block, and the shielding member is provided with a card slot on a side facing the second wall surface, and when the top cover and the base are covered, the card block is engaged with the card slot; Alternatively, after the top cover is covered with the base, the shielding member is connected to the second wall surface by ultrasonic welding.

3. The auxiliary contact according to claim 1, characterized in that: The housing includes a top cover and a base, and the top cover and the base are combined to form the installation space; The mounting surface of the housing includes a first wall surface and a second wall surface that are opposite to each other, the first wall surface is a side of the base facing the top cover, and the second wall surface is a side of the top cover facing the base; The first wall surface is provided with a shielding member, and the shielding member has a second accommodating cavity. The second wall surface is provided with a matching member, and the matching member has a third accommodating cavity. After the top cover and the base cover are closed, the shielding member abuts against the matching member, so that the second accommodating cavity and the third accommodating cavity are combined to form the sealed cavity.

4. The auxiliary contact according to claim 3, characterized in that: The shielding member is provided with a slot on one side facing the second wall surface, and the matching member is provided with a block on one side facing the first wall surface. When the top cover is covered with the base, the block is engaged with the slot. Alternatively, the shielding member and the matching member are connected by ultrasonic welding.

5. The auxiliary contact according to claim 1, characterized in that: The end portion is further provided with a second protrusion, and the second protrusion has two; The two second protrusions are symmetrically arranged with the central axis of the rod portion as the symmetry axis, the two second protrusions are respectively arranged toward the two groove walls of the guide groove, and the two second protrusions are respectively in sliding contact with the corresponding groove walls.

6. An electrical switch, characterized in that: comprising a contactor and an auxiliary contact according to any one of claims 1 to 5; The contactor is connected to the auxiliary contact.

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