An auxiliary switch structure

Abstract

The utility model provides a kind of auxiliary switch structure, including switch assembly and square shaft assembly, the square shaft assembly is rotatably connected with the switch assembly, static contact piece is provided in the switch assembly, the square shaft assembly is equipped with movable contact for cooperating with the static contact piece;The switch assembly includes front cover plate, contact box group and rear cover plate connected in sequence, the contact box assembly is installed between front cover plate and rear cover plate, pull rod is installed between the front cover plate and rear cover plate;The contact box assembly includes several mutually connected contact box bodies, the static contact piece is installed on the contact box body;The utility model can adapt to the long-term use demand of dusty environment, prolong the service life of auxiliary switch, improve the operation stability and security of entire electrical control system.

Description

Technical Field

[0001] This utility model relates to the field of electrical device technology, specifically to an auxiliary switch structure. Background Technology

[0002] Auxiliary switches, as a key component in circuit control, rely on the precise contact and reliable separation of moving and stationary contacts to control the on / off state of the circuit. They are widely used in power systems such as power plants and substations. With the increasing demand for switchgear in deserts, Gobi, open-pit mines, and dusty factory areas, the need for auxiliary switches is particularly prominent in these environments. The stable operation of switches in such environments directly affects the reliability of the entire electrical system.

[0003] However, existing auxiliary switches have significant drawbacks when used in dusty environments: dust and other foreign matter can easily penetrate the contact area, forming an insulating or wear layer on the contact surface, leading to an abnormal increase in contact resistance. This not only affects the conductivity of the switch but may also interfere with the stability of the on / off signal. More seriously, the accumulation of foreign matter can cause contact adhesion or mechanical structure jamming, resulting in a "stuck" fault of the switch, which manifests as the inability to open or close normally. This can lead to circuit malfunction, unplanned equipment shutdown, and even safety hazards. Among these, dust has become the primary cause of auxiliary switch failure in extremely dusty environments such as deserts.

[0004] To address the aforementioned issues, utility model CN222995261U discloses a novel dustproof, waterproof, and highly durable auxiliary switch (hereinafter referred to as Prior Art 1), comprising an auxiliary switch body, a guide rod, a lower protective assembly, and an upper protective assembly. The lower protective assembly includes a protective housing with a concave groove on the side of the protective housing close to the guide rod. A main shaft protective housing is slidably fitted within the concave groove, and a main shaft seal is fitted on the side of the main shaft protective housing close to the protective housing, with the main shaft seal fitted onto the outside of the guide rod. The upper protective assembly includes a protective cover plate with sealant fixedly fitted on the side of the protective cover plate away from the auxiliary switch body. A pair of wire seals are fixedly fitted between the protective cover plate and the sealant.

[0005] In the prior art 1, the auxiliary switch can be sealed and protected by setting sealant, wire sealing parts and protective cover. However, the protective structure of the prior art 1 is complicated. In actual use, the assembly steps for the auxiliary switch protection operation on site are cumbersome, the installation accuracy requirements are high and the time is long. It is difficult to meet the long-term use requirements of high dust concentration environment. Utility Model Content

[0006] The purpose of this invention is to provide an auxiliary switch structure that can adapt to the long-term use requirements of dusty environments, extend the service life of the auxiliary switch, and improve the operational stability and safety of the entire electrical control system.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] An auxiliary switch structure includes a switch assembly and a square shaft assembly, wherein the square shaft assembly is rotatably connected to the switch assembly, a stationary contact is disposed inside the switch assembly, and a moving contact for cooperating with the stationary contact is mounted on the square shaft assembly.

[0009] The switch assembly includes a front cover plate, a contact box assembly, and a rear cover plate connected in sequence. The contact box assembly is installed between the front cover plate and the rear cover plate, and a pull rod is installed between the front cover plate and the rear cover plate. The contact box assembly includes a plurality of interconnected contact box bodies, and the stationary contact piece is installed on the contact box body.

[0010] The front side of the contact box body is provided with a protrusion, and the back side of the contact box body is provided with a groove for engaging with the protrusion on the adjacent contact box body.

[0011] Preferably, there are several protrusions and grooves, which are arranged in a corresponding manner, and the combination of several protrusions and grooves forms a labyrinth sealing structure.

[0012] Preferably, the stationary contact piece is provided with a pressure groove, and the contact box body is provided with a raised rib for cooperating with the pressure groove.

[0013] Preferably, the square shaft assembly includes a square shaft body and an insulating sleeve. The square shaft body is rotatably connected to the switch assembly, and the insulating sleeve is coaxially fitted onto the square shaft body. The moving contact is connected to the square shaft body through the insulating sleeve.

[0014] Preferably, the square shaft body is provided with a slot, and a retaining ring for limiting the position of the square shaft body is installed in the slot.

[0015] Preferably, sealing mechanisms are installed at both ends of the square shaft body, and the sealing mechanisms are rotatably connected to the front cover plate and the rear cover plate.

[0016] Preferably, the sealing mechanism includes a bushing, a sealing ring, and a retaining ring, wherein the bushing is provided with a first mounting groove for mounting the sealing ring and a second mounting groove for mounting the retaining ring.

[0017] Preferably, the moving contact includes two symmetrically connected moving contact pieces, which are mounted on the insulating sleeve, and a bent portion is provided at the end of the moving contact piece away from the insulating sleeve.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] In this utility model, adjacent contact box bodies are joined together by a protrusion on the front and a groove on the back, forming a preliminary sealing barrier through the contact surfaces to prevent large dust particles from directly intruding into the contact area.

[0020] Furthermore, the number of contacts in the contact box body can be flexibly adjusted according to the contact number requirements of the auxiliary switch, eliminating the need to customize the overall housing for switches with different numbers of contacts. This adapts to the long-term use requirements of dusty environments, extends the service life of the auxiliary switch, and improves the operational stability and safety of the entire electrical control system. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of this utility model.

[0023] Figure 2 This is a schematic diagram of the structure of the protrusion in this utility model.

[0024] Figure 3 This is a schematic diagram of the groove portion in this utility model.

[0025] Figure 4 This is a schematic diagram of the sealing mechanism in this utility model.

[0026] The attached diagram lists the components represented by each number as follows:

[0027] 101-Switch assembly, 102-Square shaft assembly, 103-Stationary contact piece, 104-Moving contact, 105-Front cover plate, 106-Contact box assembly, 107-Rear cover plate, 108-Pull rod, 109-Contact box body, 110-Protrusion, 111-Groove, 112-Pressure groove, 113-Rib, 114-Square shaft body, 115-Insulating sleeve, 116-Sealing mechanism, 117-Shaft sleeve, 118-Sealing ring, 119-Retaining ring, 120-Moving contact piece. Detailed Implementation

[0028] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0029] In the description of the embodiments of this utility model, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0032] In this embodiment of the invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0033] The following disclosure provides many different implementations or examples for different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0034] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0035] See Figures 1-4 This embodiment discloses an auxiliary switch structure, including a switch assembly 101 and a square shaft assembly 102. The square shaft assembly 102 is rotatably connected to the switch assembly 101. A stationary contact piece 103 is provided inside the switch assembly 101, and a moving contact 104 for cooperating with the stationary contact piece 103 is installed on the square shaft assembly 102.

[0036] The switch assembly 101 includes a front cover plate 105, a contact box assembly 106, and a rear cover plate 107 connected in sequence. The contact box assembly 106 is installed between the front cover plate 105 and the rear cover plate 107, and a pull rod 108 is installed between the front cover plate 105 and the rear cover plate 107. The contact box assembly 106 includes a plurality of interconnected contact box bodies 109, and the stationary contact piece 103 is installed on the contact box body 109.

[0037] The front side of the contact box body 109 is provided with a protrusion 110, and the back side of the contact box body 109 is provided with a groove 111 for cooperating with the protrusion 110 provided on the adjacent contact box body 109.

[0038] In this embodiment, each contact box body 109 is a module unit with a built-in stationary contact piece 103, carrying the core function of the contact. Adjacent contact box bodies 109 are joined by a protrusion 110 on the front and a recess 111 on the back, achieving radial positioning of adjacent contact box bodies 109 to prevent lateral displacement, and forming a preliminary sealing barrier through the contact surfaces to prevent large dust particles from directly intruding into the contact area. Furthermore, the number of contact box bodies 109 can be flexibly adjusted according to the contact circuit requirements of the auxiliary switch. Customized housings are required for different circuit switches to provide protection, adapt to long-term use in dusty environments, extend the service life of auxiliary switches, and improve the operational stability and safety of the entire electrical control system. In this embodiment, the contact box body 109 is provided with through holes, and the pull rod 108 passes through several through holes on the contact box body 109 in sequence. The two ends of the pull rod 108 are threadedly connected to the front cover plate 105 and the rear cover plate 107, respectively, to form an axial clamping force on the stacked contact box assembly 106, so as to prevent the axial loosening of the spliced ​​contact box assembly 106.

[0039] In some embodiments, the outer surface of the switch assembly 101 is covered with an integrally molded sealing protective film. The sealing protective film covers the exposed surfaces of the front cover 105, the rear cover 107, and the contact box assembly 106, precisely avoiding the terminal area of ​​the stationary contact 103, the rotational through-area of ​​the square shaft assembly 102, and the mounting areas of all fasteners (e.g., the lock nut). The sealing protective film provides an overall seal for the switch assembly 101 from the outside, preventing dust from entering the contact box assembly 106 through the gaps between the front cover 105, the rear cover 107, and the contact box assembly 106. The sealing protective film is formed from a peelable silicone sealant gel specifically designed for the protection of electrical equipment housings. When the sealing protective film on the surface of the switch assembly 101 accumulates excessive dust, oil, or physical damage due to long-term use, the entire sealing protective film can be peeled off without leaving a trace, and the sealant gel can be reapplied to form a new sealing protective film.

[0040] In some embodiments, the protrusion 110 of the contact box body 109 is wrapped with an elastic sealing layer. Positioning pins are provided on the side of the front cover plate 105 and the rear cover plate 107 facing the contact box assembly 106. Positioning holes adapted to the positioning pins are opened at both ends of the contact box body 109. In this embodiment, the elastic sealing layer is made of silicone material and has good deformation capability. During splicing, the protrusion embeds into the groove, squeezing the sealing layer to completely fill the gap between the protrusion and the groove, forming a gapless seal, further blocking the dust intrusion path. After the positioning pins of the front cover plate 105 and the rear cover plate 107 are inserted into the positioning holes of the contact box body 109, multi-point precise positioning is formed, restricting the circumferential rotation of the contact box body 109, preventing the contact box from twisting after splicing and causing misalignment of the stationary contact piece 103; and ensuring that the centers of the stationary contact pieces 103 of all contact box bodies 109 are on the same straight line, precisely matching the rotation trajectory of the moving contact 104 of the square shaft assembly 102.

[0041] In some embodiments, the pull rod 108 includes a rod body and locking nuts threaded to both ends of the rod body. In this embodiment, the threaded sections at both ends of the rod body pass through the through holes of the front cover plate 105 and the rear cover plate 107, respectively, and the axial tension of the pull rod 108 on the switch assembly 101 is adjusted by tightening the locking nuts.

[0042] In some embodiments, there are multiple protrusions 110 and grooves 111, which are correspondingly arranged. The multiple protrusions 110 and grooves 111, when engaged, form a labyrinth sealing structure. In this embodiment, the corresponding engagement of multiple protrusions 110 and grooves 111 forms a multi-path, tortuous labyrinth structure of sealing channels, extending the path of dust intrusion into the contact area and significantly improving dustproof capability. No additional sealant is required, reducing construction difficulty.

[0043] In some embodiments, the stationary contact 103 is provided with a groove 112, and the contact box body 109 is provided with a rib 113 for engaging with the groove 112. In this embodiment, the groove 112 of the stationary contact 103 and the rib 113 of the contact box body 109 are engaged and fixed, thereby limiting the displacement of the stationary contact 103; preventing the stationary contact 103 from loosening or shifting due to vibration or assembly errors, ensuring the contact accuracy between the stationary contact 103 and the moving contact 104; reducing contact resistance fluctuations, reducing the risk of poor contact failure, and improving the stability of switch operation; in this embodiment, the rib 113 is made of a soft material (e.g., rubber). During the assembly of the contact box body 109, the rib 113 deforms after contacting the groove 112 on the stationary contact 103, and a tight fit is formed between the rib 113 and the groove 112, further preventing dust from entering.

[0044] In some embodiments, the square shaft assembly 102 includes a square shaft body 114 and an insulating sleeve 115. The square shaft body 114 is rotatably connected to the switch assembly 101, and the insulating sleeve 115 is coaxially fitted onto the square shaft body 114. The moving contact 104 is connected to the square shaft body 114 through the insulating sleeve 115. In this embodiment, the insulating sleeve 115 is coaxially fitted onto the square shaft body 114, achieving electrical insulation isolation between the moving contact 104 and the square shaft body 114; simultaneously, the insulation drives the moving contact 104, ensuring that the moving contact 104 rotates synchronously with the square shaft body 114.

[0045] In some embodiments, the square shaft body 114 is provided with a slot, and a retaining ring for limiting the square shaft body 114 is installed in the slot. In this embodiment, the axial movement of the square shaft body 114 is limited by the contact between the retaining ring and the front and rear cover plates 107 within the slot; the retaining ring is installed to ensure the relative position stability of the moving contact 104 and the stationary contact piece 103; to avoid contact misalignment and poor contact caused by axial displacement; at the same time, the installation of the retaining ring can also limit the bushing 117, preventing the movement of the bushing 117 from affecting the sealing effect.

[0046] In some embodiments, sealing mechanisms 116 are installed at both ends of the square shaft body 114, and the sealing mechanisms 116 are rotatably connected to the front cover plate 105 and the rear cover plate 107. The sealing mechanisms 116 are used to prevent dust from entering through the rotation gap of the square shaft body 114, thereby further improving the dustproof effect.

[0047] In some embodiments, the sealing mechanism 116 includes a bushing 117, a sealing ring 118, and a retaining ring 119. The bushing 117 is provided with a first mounting groove for mounting the sealing ring 118 and a second mounting groove for mounting the retaining ring 119. In this embodiment, the sealing ring installed in the first mounting groove is used to seal the gap between the front cover plate 105 and the rear cover plate 107 and the bushing 117, and the retaining ring 119 installed in the second mounting groove is used to seal the gap between the bushing 117 and the square shaft body 114. The double sealing further enhances the dustproof and foreign object-proof capabilities. At the same time, the retaining ring 119 installed in the second mounting groove can also further limit the square shaft body 114 to prevent axial movement of the square shaft body 114.

[0048] In some embodiments, the moving contact 104 includes two symmetrically connected moving contact pieces 120, which are mounted on the insulating sleeve 115. One end of each moving contact piece 120 away from the insulating sleeve 115 has a bent portion. In this embodiment, the two symmetrically arranged moving contact pieces 120 are connected and fixedly fitted onto the insulating sleeve 115, forming a stable clamping structure. The bent portion of the moving contact piece 120 has elastic deformation capability, ensuring the contact pressure with the stationary contact piece 103. The elastic design of the bent portion makes the contact point closer, reducing contact resistance. The symmetrical structure ensures balanced force during the switching process, improving the smoothness of the switching action.

[0049] In some embodiments, an elastic sealing layer is provided on the outside of the protrusion 110 of the contact box body 109. The elastic sealing layer is made of silicone material. When the protrusion 110 is embedded in the groove 111 of the adjacent contact box body 109, the sealing layer is compressed and completely fills the mating gap, forming a leak-free elastic sealing barrier that effectively blocks the dust intrusion path.

[0050] In some embodiments, the front cover plate 105 and the rear cover plate 107 are each provided with a positioning pin on the side facing the contact box assembly 106, and the two ends of the contact box body 109 are provided with positioning holes adapted to the positioning pins. During assembly, the cooperation of the positioning pins and positioning holes enables precise positioning at multiple points, restricts the circumferential rotation of the contact box body 109, ensures that the central axis of all stationary contact pieces 103 is consistent with the rotation trajectory of the square shaft assembly 102, and improves the contact alignment accuracy and switching reliability.

[0051] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0052] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An auxiliary switch structure, characterized in that: It includes a switch assembly (101) and a square shaft assembly (102), the square shaft assembly (102) being rotatably connected to the switch assembly (101), the switch assembly (101) having a stationary contact piece (103) inside, and the square shaft assembly (102) having a moving contact (104) for cooperating with the stationary contact piece (103); The switch assembly (101) includes a front cover plate (105), a contact box assembly (106), and a rear cover plate (107) connected in sequence. The contact box assembly (106) is installed between the front cover plate (105) and the rear cover plate (107), and a pull rod (108) is installed between the front cover plate (105) and the rear cover plate (107). The contact box assembly (106) includes a plurality of interconnected contact box bodies (109), and the stationary contact piece (103) is installed on the contact box body (109). The front side of the contact box body (109) is provided with a protrusion (110), and the back side of the contact box body (109) is provided with a groove (111) for cooperating with the protrusion (110) provided on the adjacent contact box body (109).

2. The auxiliary switch structure according to claim 1, characterized in that: There are several protrusions (110) and grooves (111) and they are arranged in a corresponding manner. The protrusions (110) and grooves (111) together form a labyrinth sealing structure.

3. The auxiliary switch structure according to claim 1, characterized in that: The stationary contact piece (103) is provided with a pressure groove (112), and the contact box body (109) is provided with a raised rib (113) for cooperating with the pressure groove (112).

4. The auxiliary switch structure according to claim 1, characterized in that: The square shaft assembly (102) includes a square shaft body (114) and an insulating sleeve (115). The square shaft body (114) is rotatably connected to the switch assembly (101). The insulating sleeve (115) is coaxially fitted onto the square shaft body (114). The moving contact (104) is connected to the square shaft body (114) through the insulating sleeve (115).

5. The auxiliary switch structure according to claim 4, characterized in that: The square shaft body (114) is provided with a slot, and a retaining ring for limiting the square shaft body (114) is installed in the slot.

6. The auxiliary switch structure according to claim 4, characterized in that: Sealing mechanisms (116) are installed at both ends of the square shaft body (114), and the sealing mechanisms (116) are rotatably connected to the front cover plate (105) and the rear cover plate (107).

7. The auxiliary switch structure according to claim 6, characterized in that: The sealing mechanism (116) includes a bushing (117), a sealing ring (118), and a retaining ring (119). The bushing (117) is provided with a first mounting groove for installing the sealing ring (118) and a second mounting groove for installing the retaining ring (119).

8. An auxiliary switch structure according to claim 4, characterized in that: The moving contact (104) includes two symmetrically connected moving contact pieces (120), which are mounted on the insulating sleeve (115). The moving contact piece (120) has a bent portion at one end away from the insulating sleeve (115).

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