Auxiliary contact and electrical switch

Abstract

The invention provides an auxiliary contact and an electrical switch, and belongs to the technical field of electrical equipment. The auxiliary contact provided by the invention comprises a shell and a contact support. And a mounting space is arranged in the shell. The contact support is arranged in the installation space in a sliding mode and comprises an end portion and a rod portion which are connected with each other. The end portion is provided with a first protrusion, the first protrusion protrudes towards the installation face of the shell relative to the rod portion, the portion, facing the installation face, of the first protrusion is in sliding contact with the installation face, and a gap is formed between the rod portion and the installation face. According to the invention, the end part of the contact support is provided with the first projection, so that a gap can be generated between the rod part of the contact support and the installation surface of the housing, and the friction area between the contact support and the installation surface of the housing is reduced, thereby reducing the plastic particles generated in the moving process of the contact support, reducing the dust particles from adhering to the moving contact and / or the static contact, and improving the reliability of the contact. And the movable contact and / or the static contact can be polluted or damaged.

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] When the auxiliary contact is frequently operated, the auxiliary contact housing and the contact support will wear out, resulting in more plastic particles. When these plastic particles fall between the moving and static contacts of the auxiliary contact and adhere to the contact surface, the moving and static contacts will be unreliable, thus causing the auxiliary contact to fail prematurely. 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, which includes a housing and a contact support. An installation space is provided inside the housing. The 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. A first protrusion is provided at the end portion, and the first protrusion protrudes toward the installation surface of the housing compared to the rod portion, and the portion of the first protrusion facing the installation surface is in sliding contact with the installation surface, and there is a gap between the rod portion and the installation surface.

[0006] Through the above scheme, the present application sets a first protrusion at the end of the contact support, and the first protrusion is set toward the mounting surface of the shell. When the contact support is installed in the shell, the existence of the first protrusion can cause a gap between the rod portion of the contact support and the mounting surface of the shell, reducing the contact area between the contact support and the mounting surface of the shell. When the contact support slides in the shell, only the first protrusion is in sliding contact with the mounting surface of the shell, which can reduce the friction area between the contact support and the mounting surface of the shell. After the friction area between the contact support and the mounting surface of the shell is reduced, the plastic particles generated during the movement of the contact support will be reduced, which can reduce the possibility of dust particles adhering to the moving contact and / or the static contact.

[0007] In a possible design, the auxiliary contact further includes a moving contact and a stationary contact. A sealed cavity is provided inside the housing, and the moving contact and the stationary contact are both located in the sealed cavity. The moving contact is connected to the rod, and the rod can drive the moving contact to move in the sealed cavity in a direction away from or close to the stationary contact.

[0008] Through the above scheme, the present application sets a sealed cavity inside the shell, and makes the moving contact and the static contact both located in the sealed cavity. On the basis of the shell providing protection 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, so that the particles generated by the friction between the end of the contact support and the shell can be reduced from falling on the surface of the moving contact and / or the static contact. In addition, when the shell is not completely sealed, or the shell is aged 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 a possible design, the housing includes a top cover and a base, and the installation space is located at the base. The installation 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. A shielding member is provided on the first wall surface, and the shielding member has a first accommodating cavity. After the top cover and the base are covered, the side of the shielding member facing the second wall surface abuts against the second wall surface to form a sealed cavity at the first accommodating cavity.

[0010] According to the above solution, since the installation space is located in the base, the shielding member can be arranged in the base. When the shielding member is arranged in the installation space of the base, the first wall surface, the second wall surface and the shielding member can cooperate to form a sealed cavity, so that there is no need to additionally arrange a baffle at the opening of the shielding member, thereby saving the internal space of the housing.

[0011] In a possible design, a block is provided on the second wall, and a slot is provided on the side of the shielding member facing the second wall, and after the top cover and the base are covered, the block is connected to the slot. Alternatively, after the top cover and the base are covered, the shielding member and the second wall are connected by ultrasonic welding.

[0012] According to the above solution, the top cover and the shielding member can be detachably connected by the way of the clamping block and the clamping groove. In this case, not only can the first accommodating cavity form a sealed cavity after the top cover and the base are covered, but also when the moving contact or the static contact in the sealed cavity is aged or damaged and needs to be replaced, the top cover can be easily removed to replace or repair the moving contact or the static contact in the first accommodating cavity.

[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, since the shielding member is located in the installation space and the top cover is covered on the installation space, the use of ultrasonic welding can make the fixed connection between the top cover and the shielding member easier.

[0014] In a possible design, the housing includes a top cover and a base, and the top cover and the base are covered to form an installation space. The installation 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, the shielding member has a second accommodating cavity, the second wall surface is provided with a matching member, the matching member has a third accommodating cavity, and after the top cover and the base are covered, the shielding member and the matching member abut against each other, so that the second accommodating cavity and the third accommodating cavity are combined to form a sealed cavity.

[0015] Through the above scheme, when the base is provided with an installation space, the shielding member can be arranged in the installation space of the base, and when the top cover is provided with an installation space, the matching member can be arranged in the installation space of the top cover. The first wall surface cooperates with the shielding member to form the second accommodating cavity, so that there is no need to set up an additional baffle to make the shielding member form the second accommodating cavity, thereby saving the internal space of the base. The second wall surface cooperates with the matching member to form the third accommodating cavity, so that there is no need to set up an additional baffle to make the matching member form the third accommodating cavity, thereby saving the internal space of the top cover. When the top cover is covered 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 a possible design, a slot is provided on the side of the shielding member facing the second wall, and a block is provided on the side of the matching member facing the first wall, and after the top cover and the base are covered, the block is engaged with the slot. Alternatively, the shielding member and the matching member are connected by ultrasonic welding.

[0017] Through the above solution, the shielding member and the matching member can be detachably connected by the way of the clamping block and the clamping groove. At this time, after the top cover and the base are covered, the second accommodating cavity and the third accommodating cavity can be combined to form a sealed cavity. When the moving contact or the static contact in the sealed cavity is aged or damaged and needs to be replaced, the top cover and the base can be disassembled to separate the shielding member from the matching member, so that the moving contact or the static contact in the sealed cavity can be replaced or repaired more conveniently.

[0018] In addition, the shielding member and the matching member can be fixedly connected by ultrasonic welding. When the shielding member and the matching 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, since the shielding member and the matching member are both located in the installation space, and the installation space is formed by the top cover and the base cover, the use of ultrasonic welding can make the fixed connection between the shielding member and the matching member easier.

[0019] In a possible design, a guide groove is provided in the shell, 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 scheme, a guide groove is arranged in the housing, and the guide groove can be used to guide the movement of the contact support, so that the movement process of the contact support is more stable. The end is located in the guide groove, and the end is in sliding contact with the groove wall of the guide groove, which can not only improve the guiding effect of the guide groove, but also the plastic particles generated by the friction between the end and the groove wall of the guide groove during the movement of the contact support can be collected by the guide groove, reducing the possibility of plastic particles falling on 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 a possible design, the end is further provided with a second protrusion, and there are two second protrusions. The two second protrusions are symmetrically arranged with the central axis of the rod 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.

[0022] Through the above scheme, two second protrusions are arranged 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 the movement process, and reduce the probability of the contact support being offset toward the side where the second protrusion is not arranged during the movement due to the second protrusion being arranged on only one side. The two second protrusions are in sliding contact with the corresponding groove walls respectively, so that the friction part between the end and the guide groove can be transferred in the direction away from the moving path of the contact support, so that the probability of the contact support carrying the plastic particles generated by the friction between the end and the guide groove along the moving path of the contact support during the movement process 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. In this way, excessive accumulation of plastic particles in the guide groove can be avoided, 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 can be avoided, 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 A schematic diagram of the overall structure of the auxiliary contact provided in an embodiment of the present application.

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

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

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

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

[0032] Figure 6 An assembly diagram of a contact support and a 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: 100, housing; 110, sealing chamber; 120, top cover; 121, second wall; 122, matching piece; 130, base; 131, first wall; 132, shielding piece; 140, guide groove; 150, material leakage port; 200, contact support; 210, end; 211, first protrusion; 212, second protrusion; 220, rod; 300, moving contact; 400. Stationary contact. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of the application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0038] The terms "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.

[0039] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase "embodiments" in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0040] The term "and / or" in this article is only a description of the association relationship of the associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0041] The directional words appearing in the following description are all directions shown in the drawings, and do not limit the static contact of a circuit breaker of the present application and the specific structure of the circuit breaker. For example, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate directions or positional relationships 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 operated in a specific direction, and therefore cannot be understood as a limitation on the present application.

[0042] In addition, the terms "first", "second", etc. in the specification 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 of the features.

[0043] In the description of the present 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-on or snap-fit ​​connection; the physical connection may also be an integral connection, such as a connection formed by welding, bonding or integral molding. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0044] As an important component in automatic control systems, contactors are widely used in various industrial control systems, such as motor control, lighting systems, heating devices, and fans. Contactors are mainly used to remotely connect and disconnect AC or DC main circuits, as well as frequently start and control AC motors. Contactors use the magnetic force generated by electromagnetic coils to drive the closing and opening of contacts, thereby achieving control of the circuit.

[0045] Auxiliary contacts are a common accessory in electrical switches and are usually used in conjunction with contactors. A card slot is usually provided on the housing of the contactor, and a card block that matches the card slot is provided at a corresponding position on the housing of the auxiliary contact. The auxiliary contact can be connected to the contactor by engaging the card block with the card slot. The auxiliary contact can be used to control other electrical equipment or detect the working status of other circuits.

[0046] In the prior art, the auxiliary contact usually moves together with the contactor. During use, the contact support of the auxiliary contact will rub against the housing of the auxiliary contact, generating a large number of fine plastic particles. These fine particles will fall onto the moving contact and / or the stationary contact as the contact support moves, contaminating the contact point between the moving contact and the stationary contact, increasing the resistance between the moving contact and the stationary contact, and thus possibly causing the auxiliary contact to fail.

[0047] Based on this, the present application provides an electrical switch, which includes a contactor and an auxiliary contact, wherein the contactor is connected to the auxiliary contact. The auxiliary contact provided by the present application can reduce the possibility of dust particles adhering to the moving contact and / or the static contact, so as to improve the reliability of the auxiliary contact. In this way, when the auxiliary contact and the contactor connected thereto are actuated, the auxiliary contact can respond more quickly, thereby improving the reliability of the electrical switch.

[0048] 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 in conjunction with the accompanying drawings.

[0049] Figure 1 A schematic diagram of the overall structure of the auxiliary contact provided in an embodiment of the present application. Figure 2 A 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. An installation space is provided inside the housing 100. The contact support 200 is slidably arranged in the installation space, and the contact support 200 includes an end portion 210 and a rod portion 220 connected to each other. The end portion 210 is provided with a first protrusion 211, and the first protrusion 211 protrudes toward the installation surface of the housing 100 compared to the rod portion 220. The first protrusion 211 is in sliding contact with the installation surface at a position facing the installation surface, and there is a gap between the rod portion 220 and the installation surface.

[0050] Figure 4 A schematic diagram of the structure 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, and the top cover 120 and the base 130 can be covered to form an installation space. The side of the base 130 facing the top cover 120 can be a first wall surface 131, and the side of the top cover 120 facing the base 130 can be a second wall surface 121, and the first wall surface 131 and the second wall surface 121 can both be installation surfaces.

[0051] The contact support 200 is slidably disposed in the installation space. The contact support 200 may be columnar, the middle portion of the contact support 200 may be a rod portion 220, and both ends of the contact support 200 may be end portions 210. The first protrusion 211 may be a block structure disposed at the end portion 210, and the first protrusion 211 may be disposed in a variety of forms. The various configuration forms of the first protrusion 211 are exemplified below, but do not constitute a limitation on the technical solution of the present application.

[0052] The first arrangement form: the first protrusion 211 is arranged on the side of the end 210 facing the first wall 131, and the first protrusion 211 is in sliding contact with the first wall 131. At this time, there is a gap between the rod 220 and the first wall 131. When the contact support 200 moves in the housing 100, the rod 220 does not contact the first wall 131, so that the number of plastic particles generated by friction between the contact support 200 and the first wall 131 can be reduced, and the possibility of dust particles adhering to the moving contact and / or the static contact is reduced.

[0053] The second arrangement form: the first protrusion 211 is arranged on the side of the end 210 facing the second wall 121, and the first protrusion 211 is in sliding contact with the second wall 121. At this time, there is a gap between the rod 220 and the second wall 121. When the contact support 200 moves in the housing 100, the rod 220 does not contact the second wall 121, so that the number of plastic particles generated by friction between the contact support 200 and the second wall 121 can be reduced, and the possibility of dust particles adhering to the moving contact and / or the static contact is reduced.

[0054] The third arrangement form: the first protrusion 211 is arranged on the side of the end 210 facing the first wall 131, and the first protrusion 211 is arranged on the side of the end 210 facing the second wall 121. At this time, the first protrusion 211 arranged toward the first wall 131 is in sliding contact with the first wall 131, and the first protrusion 211 arranged toward the second wall 121 is in sliding contact with the second wall 121, and there is a gap between the rod 220 and the first wall 131, and between the rod 220 and the second wall 121. When the contact support 200 moves in the housing 100, the rod 220 and the first wall 131, and the rod 220 and the second wall 121 are not in contact, so that the number of plastic particles generated by friction between the contact support 200 and the first wall 131 and between the contact support 200 and the second wall 121 can be reduced, and the possibility of dust particles adhering to the moving contact and / or the static contact is reduced.

[0055] It can be seen that no matter which of the above-mentioned settings of the first protrusion 211 is adopted, 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.

[0056] It should be noted that both ends 210 of the contact support 200 may 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 may abut against the mounting surface through the first protrusion 211. In this way, the contact area between the rod 220 and the mounting surface can be further reduced, thereby reducing the number of plastic particles generated by friction between the contact support 200 and the housing 100. In addition, when both ends 210 of the contact support 200 are provided with the first protrusion 211, the probability of the contact support 200 being tilted in 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 when moving.

[0057] In addition, the size of the first protrusion 211 can be set to be smaller, so that 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 is convenient for reducing the number of plastic particles generated between the first protrusion 211 and the mounting surface during the movement of the contact support 200.

[0058] In summary, the present application sets a first protrusion 211 at the end 210 of the contact support 200, and the first protrusion 211 is set toward 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 can generate 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 in 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. After the friction area between the contact support 200 and the mounting surface of the housing 100 is reduced, the plastic particles generated during the movement of the contact support 200 will be reduced, thereby reducing the possibility of dust particles adhering to the moving contact and / or the static contact.

[0059] As the operating environment of electrical switches becomes more complex and harsh, foreign matter such as dust in the external environment may enter the housing 100 of the auxiliary contact and fall onto the moving contact 300 and / or the stationary contact 400. These dust and foreign matter may also contaminate the contact points of the moving contact 300 and the stationary contact 400, thereby increasing the resistance between the moving contact 300 and the stationary contact 400, thereby causing the auxiliary contact to fail.

[0060] 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.

[0061] Figure 6 The 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 contact further includes a moving contact 300 and a stationary contact 400. A sealed cavity 110 is provided inside the housing 100, and the moving contact 300 and the stationary contact 400 are both located in the sealed cavity 110. The moving contact 300 is connected to the rod 220, and the rod 220 can drive the moving contact 300 to move in the sealed cavity 110 in a direction away from or close to the stationary contact 400.

[0062] The sealed cavity 110 may be an independent space in the housing 100. The sealed cavity 110 may be provided with a notch for the static contact 400 to extend into, so that the static contact point of the static contact 400 is located in the independent space. The sealed cavity 110 may also be provided with a notch for the contact support 200 to be installed, so that the rod portion 220 of the contact support 200 is located in the independent space, and the end portion 210 of the contact support 200 is located outside the independent space.

[0063] The rod portion 220 of the contact support 200 may be provided with a moving contact window, the moving contact bridge of the moving contact 300 is located in the moving contact window, and the moving contact point of the moving contact 300 is located outside the moving contact window. When the contact support 200 moves in the housing 100, the moving contact 300 may move along with the rod portion 220 in a direction away from or close to the stationary contact 400, and the moving contact point is always located in the sealed cavity 110.

[0064] In summary, the present application sets a sealed cavity 110 inside the housing 100, and makes the moving contact 300 and the static contact 400 both located in 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, so as to reduce the particles generated by the friction between the end 210 of the contact support 200 and the housing 100 falling on the surface of the moving contact and / or the static contact. In addition, when the housing 100 is not completely sealed, or the housing 100 is aged 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.

[0065] There are many ways to set up the sealed cavity, and this application only introduces two of them in detail.

[0066] Based on the above description, the housing 100 includes a top cover 120 and a base 130, and the top cover 120 and the base 130 can be covered to form an installation space. The side of the base 130 facing the top cover 120 can be a first wall surface 131, and the side of the top cover 120 facing the base 130 can be a second wall surface 121, and the first wall surface 131 and the second wall surface 121 can both be installation surfaces.

[0067] 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 .

[0068] Based on this, the first wall 131 is provided with a shielding member 132, and the shielding member 132 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.

[0069] 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.

[0070] The shielding member 132 may 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, so that the interior of the "mouth" shaped structure forms a first accommodation cavity. Two opposing baffles in the "mouth" shaped structure are provided with notches, and the contact support 200 may be installed at the notches. When the top cover 120 and the base 130 are covered, the second wall 121 blocks the opening on the other side of the shielding member 132, so that the first accommodation cavity forms a sealed cavity 110.

[0071] Through the above arrangement, since the installation space is located in the base 130, the shielding member 132 can be arranged in the base 130. When the shielding member 132 is arranged in the installation space of the base 130, the first wall surface 131, the second wall surface 121 and the shielding member 132 can be used to cooperate to form the sealed cavity 110, so that there is no need to additionally arrange a baffle at the opening of the shielding member 132, thereby saving the internal space of the housing 100.

[0072] It should be noted that in this embodiment, not only can the shielding member 132 be disposed on the first wall surface 131 as described above, but the shielding member 132 can also be disposed on the second wall surface 121 .

[0073] Unlike when the shielding member 132 is arranged on the first wall surface 131, when the shielding member 132 is arranged on the second wall surface 121, the opening on one side of the shielding member 132 is fixedly connected to the second wall surface 121, so that the interior of the "mouth"-shaped structure forms a first accommodating cavity. In the "mouth"-shaped structure, two opposing baffles are provided with notches, and the contact support 200 can be installed at the notches. When the top cover 120 and the base 130 are covered, the notch on the shielding member 132 cooperates with the rod portion 220 of the contact support 200, so that the shielding member 132 covers the moving contact 300 and the static contact point, and the opening on the other side of the shielding member 132 is blocked by the first wall surface 131, so that the first accommodating cavity forms a sealed cavity 110.

[0074] Based on the first possible embodiment, when the shielding member 132 is disposed on the first wall surface 131, the second wall surface 121 may be provided with a block, and the shielding member 132 may be provided with a slot on the side facing the second wall surface 121, and after the top cover 120 and the base 130 are covered, the block and the slot are engaged. Alternatively, after the top cover 120 and the base 130 are covered, the shielding member 132 and the second wall surface 121 are connected by ultrasonic welding.

[0075] The block may be a protrusion structure provided on the second wall 121 toward the first wall 131, and the slot may be a groove structure provided on the side of the shielding member 132 toward the second wall 121. The second wall 121 may also be provided with a slot, and the side of the shielding member 132 toward the second wall 121 may also be provided with a block.

[0076] Ultrasonic welding is a method of joining two or more pieces of thermoplastic plastic materials using high-frequency vibration energy. During the welding process, ultrasonic vibrations are converted into mechanical vibrations by a transducer, and the vibration energy is transmitted to the surface of the plastic material through a horn. When the vibration energy is large enough, the surface of the plastic material will generate heat due to friction, causing the material to partially melt. After cooling, the melted part will solidify, thus firmly joining the plastic materials together.

[0077] In summary, the top cover 120 and the shielding member 132 can be detachably connected by the way of the clamping block and the clamping slot. At this time, 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 moving contact 300 or the stationary contact 400 in the sealed cavity 110 is aged or damaged and needs to be replaced, the top cover 120 can be easily removed to replace or repair the moving contact 300 or the stationary contact 400 in the first accommodating cavity.

[0078] In addition, 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 better, and dust particles from the outside are less likely to enter the sealed cavity 110. In addition, since the shielding member 132 is located in the installation space and the top cover 120 is covered on the installation space, the use of ultrasonic welding can make the fixed connection between the top cover 120 and the shielding member 132 easier.

[0079] Based on the first possible embodiment, when the shielding member 132 is disposed on the second wall surface 121, the first wall surface 131 may be provided with a block, and the side of the shielding member 132 facing the first wall surface 131 may be provided with a slot, or the first wall surface 131 is provided with a slot, and the side of the shielding member 132 facing the first wall surface 131 is provided with a block, and the block is engaged with the slot. Alternatively, after the top cover 120 and the base 130 are covered, the shielding member 132 and the first wall surface 131 may be connected by ultrasonic welding.

[0080] The effect is the same as above and will not be repeated here.

[0081] 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, or in other words, the installation space may be located in the top cover 120 and the base 130 .

[0082] Based on this, a shielding member 132 is provided on the first wall 131, and the shielding member 132 has a second accommodating cavity. A matching member 122 is provided on the second wall 121, and the matching member 122 has a third accommodating cavity. After the top cover 120 and the base 130 are covered, the shielding member 132 abuts against the matching member 122, so that the second accommodating cavity and the third accommodating cavity are combined to form a sealed cavity 110.

[0083] The top cover 120 has a small installation space, and the base 130 also has a small installation space. The top cover 120 and the base 130 can be covered to 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.

[0084] 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.

[0085] The matching piece 122 may be a "mouth" shaped structure formed by four baffles connected end to end, and an opening on one side of the matching piece 122 is fixedly connected to the second wall surface 121, so that a third accommodating cavity is formed inside the "mouth" shaped structure. The size and shape of the third accommodating cavity may be the same as those of the second accommodating cavity.

[0086] 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 matching member 122 facing the base 130 , so that the second accommodating cavity and the third accommodating cavity are combined to form a sealed cavity 110 .

[0087] In summary, when the base 130 is provided with an installation space, the shielding member 132 can be arranged in the installation space of the base 130, and when the top cover 120 is provided with an installation space, the matching member 122 can be arranged in the installation space of the top cover 120. The first wall surface 131 cooperates with the shielding member 132 to form the second accommodation cavity, so that there is no need to set up an additional baffle so that the shielding member 132 forms the second accommodation cavity, thereby saving the internal space of the base 130. The second wall surface 121 cooperates with the matching member 122 to form the third accommodation cavity, so that there is no need to set up an additional baffle so that the matching member 122 forms the third accommodation cavity, thereby saving the internal space of the top cover 120. When the top cover 120 and the base 130 are covered, the shielding member 132 cooperates with the matching member 122 to combine the second accommodation cavity with the third accommodation cavity to form the sealed cavity 110, which can effectively shield the moving contact 300 and the static contact 400 in the sealed cavity 110.

[0088] Based on the second possible embodiment, a slot is provided on the side of the shielding member 132 facing the second wall surface 121, and a block is provided on the side of the matching member 122 facing the first wall surface 131, and after the top cover 120 and the base 130 are covered, the block is engaged with the slot. Alternatively, the shielding member 132 and the matching member 122 are connected by ultrasonic welding.

[0089] The slot may be a groove structure provided on the side of the shielding member 132 facing the second wall surface 121, and the block may 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 may also be provided with a block, and the side of the matching member 122 facing the first wall surface 131 may be provided with a slot.

[0090] Ultrasonic welding has been introduced in detail above and will not be repeated here.

[0091] In summary, the shielding member 132 and the matching member 122 can be detachably connected by the way of the clamping block and the clamping slot. At this time, after the top cover 120 and the base 130 are covered, the second accommodating cavity and the third accommodating cavity can be combined to form the sealed cavity 110. When the moving contact 300 or the static contact 400 in the sealed cavity 110 is aged or damaged and needs to be replaced, the top cover 120 and the base 130 can be disassembled to separate the shielding member 132 from the matching member 122, so that the moving contact 300 or the static contact 400 in the sealed cavity 110 can be replaced or repaired.

[0092] In addition, the shielding member 132 and the matching member 122 can be fixedly connected by ultrasonic welding. When the shielding member 132 and the matching member 122 are fixedly connected, the sealing effect of the sealed cavity 110 is better, and dust particles from the outside are less likely to enter the sealed cavity 110. Moreover, since the shielding member 132 and the matching member 122 are both located in the installation space, and the installation space is formed by the top cover 120 and the base 130, the use of ultrasonic welding can make the fixed connection between the shielding member 132 and the matching member 122 easier.

[0093] 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 .

[0094] In some possible designs, the guide groove 140 may be a groove structure provided on the first wall 131 and / or the second wall 121. The end 210 is slidably provided in the guide groove 140, and the side wall of the end 210 providing the moving contact window is in sliding contact with the groove wall of the guide groove 140.

[0095] In other possible designs, a guide block may be 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.

[0096] In summary, the guide groove 140 is provided in the housing 100, and the guide groove 140 can be used to guide the movement of the contact support 200, so that the movement process of the contact support 200 is more stable. The end 210 is located in the guide groove 140, and the end 210 is in sliding contact with the groove wall of the guide groove 140, which can not only improve the guiding effect of the guide groove 140, but also the plastic particles generated by the friction between the end 210 and the groove wall of the guide groove 140 during the movement of the contact support 200 can be collected by the guide groove 140, reducing the possibility of plastic particles falling on 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.

[0097] 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 A magnified view of section A. Figure 7 as well as Figure 8As shown, the end portion 210 is further provided with a second protrusion 212, and there are two second protrusions 212. The two second protrusions 212 are symmetrically arranged with the central axis of the rod portion 220 as the symmetry axis, 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.

[0098] The two second protrusions 212 can both be block structures provided on the end 210. The two second protrusions 212 are respectively provided on the two side walls of the contact support 200 provided with the moving contact window. When the contact support 200 moves in the housing 100, the two second protrusions 212 are respectively in sliding contact with the corresponding groove walls, so that the guide groove 140 can guide the movement of the contact support 200.

[0099] In some possible designs, only one end 210 of the contact support 200 is provided with the second protrusion 212 .

[0100] In some other possible designs, the ends 210 on both sides of the contact support 200 are both provided with second protrusions 212 .

[0101] Through the above arrangement, two second protrusions 212 are arranged at the end 210, and the two second protrusions 212 are symmetrically arranged with the central axis of the rod 220 as the axis of symmetry, so that the contact support 200 can be more stable during the movement, and the probability of the contact support 200 being offset toward the side where the second protrusion 212 is not arranged during the movement due to only one side being provided with the second protrusion 212 is reduced. The two second protrusions 212 are in sliding contact with the corresponding groove wall respectively, so that the friction part between the end 210 and the guide groove 140 can be transferred to the direction away from the moving path of the contact support 200, so that the probability of the plastic particles generated by the friction between the end 210 and the guide groove 140 during the movement of the contact support 200 can be reduced to be carried to the moving contact 300 and the stationary contact 400 along the moving path of the contact support 200, thereby reducing the possibility of dust particles adhering to the moving contact and / or the stationary contact.

[0102] 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 .

[0103] 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 at 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 may be a gap between the guide block and the matching member 122, or may be a notch provided on the side wall of the guide block and connected to the guide groove 140.

[0104] In summary, the material leakage port 150 is provided in the housing 100, and the material leakage port 150 is communicated with the guide groove 140. When the contact support 200 moves in the housing 100, the end 210 rubs against the groove wall of the guide groove 140 to generate plastic particles, and these plastic particles can fall through the material leakage port 150. In this way, it is possible to avoid excessive accumulation of plastic particles in the guide groove 140, and the probability of some plastic particles being carried to the moving contact 300 and the stationary contact 400 by the contact support 200 when the contact support 200 moves, thereby reducing the possibility of dust particles adhering to the moving contact and / or the stationary contact.

Claims

1. An auxiliary contact, characterized in that: include: A housing having an installation space therein; A contact support is slidably disposed 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 compared to the rod portion, and the first protrusion is in sliding contact with the mounting surface at a portion facing the mounting surface, and a gap is provided between the rod portion and the mounting surface.

2. The auxiliary contact according to claim 1, characterized in that: It also includes a moving contact and a stationary contact; A sealed cavity is provided inside the housing, and the moving contact and the static contact are both located in the sealed cavity; The moving contact is connected to the rod portion, and the rod portion can drive the moving contact to move in the sealed cavity in a direction away from or close to the stationary contact.

3. The auxiliary contact according to claim 2, characterized in that: The housing comprises a top cover and a base, and the installation space is located at the base; 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 having a first accommodating cavity. After the top cover and the base are covered, the side of the shielding member facing the second wall surface abuts against the second wall surface to form the sealed cavity at the first accommodating cavity.

4. The auxiliary contact according to claim 3, 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 after 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.

5. The auxiliary contact according to claim 2, characterized in that: The housing comprises 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 is covered with the base, the shielding member abuts against the matching member, so that the second accommodating cavity is combined with the third accommodating cavity to form the sealed cavity.

6. The auxiliary contact according to claim 5, 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, and after 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.

7. The auxiliary contact according to claim 1, characterized in that: A guide groove is arranged in the shell, 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.

8. The auxiliary contact according to claim 7, characterized in that: The end is also 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.

9. The auxiliary contact according to claim 7, characterized in that: A material leakage port is also provided in the shell body, and the material leakage port is communicated with the guide groove.

10. An electrical switch, characterized in that: A contactor comprising an auxiliary contact as claimed in any one of claims 1 to 9; The contactor is connected to the auxiliary contact.

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