A switch

Abstract

The utility model relates to a switch belongs to electrical technology field. Including operating mechanism and contact system, with a transmission between operating mechanism and contact system, transmission torque is delivered between the output shaft of operating mechanism and the movable contact of contact system, at least one metal insert is equipped in transmission, and the output shaft is inserted in the center hole of transmission and is abutted with metal insert. Advantage: transmission mainly bears force by metal insert, and the opening of metal insert provides metal contact surface, guarantees operating mechanism output stroke, improves the use reliability of product, simultaneously, the metal insert adopts multiple side -by -side arrangement in the form of axial, and each metal insert is contacted with the output shaft respectively, thereby increases the actual length of contact section, improves the stress concentration phenomenon of transmission, and single metal insert is simple in manufacturing, and the cost is lower.

Description

Technical Field

[0001] This utility model belongs to the field of electrical technology, specifically relating to a switch. Background Technology

[0002] Switches, such as automatic transfer switches (ATSEs), are primarily used to automatically switch a load circuit from one power source to another. They are suitable for emergency power supply systems with rated AC voltages not exceeding 1000V or DC voltages not exceeding 1500V. Currently, they are widely used in numerous fields including industry, medical, telecommunications, petroleum, coal, metallurgy, rail transportation, computer centers, military facilities, airports, fire protection, and important civil buildings. They ensure the continuity of power supply to primary and secondary loads in power distribution networks where high power continuity is required. Automatic transfer switches consist of an operating mechanism and a contact system. A transmission component exists between the operating mechanism and the contact system. This transmission component is the core mechanical component that enables the power switching function of the automatic transfer switch. It effectively transmits operating force and motion to the contact system, causing the moving contact to separate or close relative to the stationary contact, achieving rapid and reliable power switching. During the use of automatic transfer switches, the transmission component is prone to wear and deformation, leading to increased transmission clearance, reduced output stroke, and decreased contact overtravel, thus affecting product reliability.

[0003] In view of the above-mentioned existing technology, it is necessary to improve the structure of the transmission component of the existing switch. To this end, the applicant has made a useful design, and the technical solution to be introduced below is produced in this context. Utility Model Content

[0004] The purpose of this utility model is to provide a switch in which a metal insert is provided in the transmission component, which can effectively improve the structural strength of the transmission component, prevent wear and deformation problems, ensure the output stroke of the operating mechanism, reduce contact overtravel loss, and thus improve product reliability.

[0005] The purpose of this utility model is achieved as follows: a switch includes an operating mechanism and a contact system, with a transmission member between the operating mechanism and the contact system. The transmission member transmits torque between the output shaft of the operating mechanism and the moving contact of the contact system. At least one metal insert is provided in the transmission member, and the output shaft is inserted into the central hole of the transmission member and abuts against the metal insert.

[0006] In a specific embodiment of this utility model, the metal insert has an opening in the middle with the same size as the central hole. When the output shaft is inserted into the central hole of the transmission component, its outer peripheral surface simultaneously abuts against the inner surfaces of the central hole and the opening.

[0007] In another specific embodiment of this utility model, the metal insert has anti-slip portions formed on its outer surfaces.

[0008] In another specific embodiment of this utility model, the number of metal inserts is two, which are stacked along the axial direction of the output shaft.

[0009] In another specific embodiment of the present invention, the metal insert includes a pair of identical metal insert arms that are symmetrically distributed radially along the output shaft, and the pair of metal insert arms cooperate with each other to form the opening.

[0010] This invention incorporates a metal insert into a transmission component using injection-molded parts. When the output shaft rotates, the transmission component primarily relies on the metal insert for force. Compared to traditional transmission components without metal inserts, the opening of the metal insert provides a metal contact surface, resulting in higher structural strength and preventing wear and deformation of the contact surface. This ensures the output stroke of the operating mechanism and prevents contact overtravel, thereby improving product reliability. Furthermore, the metal inserts are arranged in multiple axially parallel configurations, each contacting the output shaft individually. This increases the actual length of the contact section, mitigating stress concentration in the transmission component. Individual metal inserts are also simple to manufacture and have low cost. Moreover, when the output shaft is inserted into the central hole of the transmission component, it simultaneously engages with both the transmission component and the metal insert. This ensures that the length of the metal contact section meets product usage requirements while also guaranteeing the length of the plastic contact section, improving the overall structural strength of the components, extending service life, and enhancing product quality. Finally, the metal insert has anti-slip features on its outer perimeter, providing a larger contact surface with the transmission component. This mitigates localized stress concentration within the transmission component, preventing deformation and wear. Attached Figure Description

[0011] Figure 1 A schematic diagram showing the cooperation between the operating mechanism and transmission components of the switch; Figure 2 This is a schematic diagram of the cooperation between the transmission component and the metal insert in one embodiment of the present invention; Figure 3 This is a schematic diagram of one structure of the metal insert described in this utility model; Figure 4 This is a schematic diagram of another structure of the metal insert described in this utility model; Figure 5 This is a schematic diagram of the cooperation between the transmission component and the metal insert in another embodiment of the present invention; Figure 6 This is a schematic diagram of another structure of the metal insert described in this utility model; Figure 7 This is a schematic diagram of another structure of the metal insert described in this utility model.

[0012] In the figure: 1. Operating mechanism, 11. Output shaft; 2. Transmission component, 21. Center hole, 211. Inner wall one, 212. Inner wall two, 2121. Notch, 2122. Right-angled inner wall, 22. Coupling groove; 3. Metal insert, 30. Metal insert arm, 31. Opening, 311. Inner wall, 32. Anti-slip part. Detailed Implementation

[0013] The specific embodiments of this utility model are described in detail below with reference to the accompanying drawings. However, the description of the embodiments is not a limitation on the technical solution. Any formal but not substantive changes made based on the concept of this utility model should be considered within the protection scope of this utility model.

[0014] In the following description, all directional (or orientational) concepts involving up, down, left, right, front, and back refer to the position of the figure being described, and are intended to facilitate public understanding. Therefore, they should not be construed as a special limitation on the technical solution provided by this utility model.

[0015] This utility model relates to a switch, which typically includes an operating mechanism 1 and a contact system. The operating mechanism 1 contains a power source consisting of a motor, electromagnets, etc. A transmission component 2 is provided between the operating mechanism 1 and the contact system, transmitting torque between the output shaft 11 of the operating mechanism 1 and the moving contact of the contact system. For example, in the application of the automatic transfer switch described in this embodiment, the operating mechanism 1 has a pair of electromagnets, and through multiple linkages, the power of the electromagnets is ultimately transmitted to the output shaft 11. The automatic transfer switch also includes the transmission component 2 connecting the contact system (known technology, not shown in the figure) and the output shaft 11 for transmission. Figure 1 and Figure 2 The transmission component 2 has at least one metal insert 3 embedded within it, forming a tight connection. The output shaft 11 is inserted into the central hole 21 at one end of the transmission component 2, abutting against the metal insert 3. The moving contact support of the contact system engages with a coupling groove 22 on the other end of the transmission component 2 opposite to the output shaft 11, thereby converting the driving force of the electromagnet into torque to drive the moving contact of the contact system to rotate, separating or closing from the stationary contact. Since the moving contact has two strokes—separation and closing—from the stationary contact, the output shaft 11 can rotate in both forward and reverse directions.

[0016] Example 1: See Figure 2 and Figure 3Two metal inserts 3 are stacked and positioned at the midpoint of the central hole 21 along its axial direction. Each metal insert 3 has an opening 31 of the same size as the central hole 21. The output shaft 11 is inserted into the central hole 21 of the transmission component 2, simultaneously engaging with both the transmission component 2 and the metal insert 3. The central hole 21 has inner walls 211 and 212 on either side of the metal insert 3 along its depth direction, with inner wall 212 located at the opening of the central hole 21. To ensure that the output shaft 11 can simultaneously abut against both the central hole 21 and the opening 31, the inner wall 311 of the opening 31 must be flush with both inner walls 211 and 212 of the central hole 21. When the output shaft 11 is inserted into the center hole 21 of the transmission component 2, from the inside of the center hole 21 outward, the outer peripheral side of the output shaft 11 axially upward abuts against the inner wall 211 of the center hole 21, the inner wall 311 of the two metal inserts 3, and the inner wall 212 of the center hole 21 in sequence.

[0017] Furthermore, the inner wall 211 and inner wall 212 of the central hole 21 can have different shapes, but the parts that abut against the output shaft 11 must have the same size and shape. For example, see below. Figure 2 In this embodiment, the output shaft 11 is a square shaft, and the inner wall 1 211 is also square. The inner wall 212 has a notch 2121 recessed in the middle of the four directions of up, down, left and right, but still retains a right-angled inner wall 2122 with the same size as the inner wall 1 211 for abutting against the four right angles of the square shaft 1.

[0018] In this embodiment, the metal insert 3 is square and has anti-shifting portions 32 on its outer sides. The anti-shifting portions 32 can be: Figure 3 The wave shape shown Figure 4 The triangular groove shown. The metal insert 3, through the anti-shift portion 32 formed on its periphery, can expand the mating surface with the transmission component 2, improve the phenomenon of local stress concentration inside the transmission component 2, and thus effectively avoid problems such as deformation and wear inside the transmission component 2.

[0019] Typically, the output shaft 11 is a metal part, and the transmission component 2 is an injection-molded part. The purpose of including a metal insert 3 in the injection-molded transmission component 2 is as follows: when the output shaft 11 rotates, the transmission component 2 mainly relies on the metal insert 3 for force. Compared to a traditional transmission component 2 without a metal insert 3, the opening 31 of the metal insert 3 provides a metal contact surface, resulting in higher structural strength and effectively preventing deformation and wear of the contact surface. This ensures the output stroke of the operating mechanism and prevents contact overtravel reduction, thereby improving product reliability. Furthermore, the metal insert 3 is arranged in multiple parallel axial directions. This has the advantage that, due to manufacturing limitations, the square cavity 31 of the metal insert 3 will actually have a machining slope, causing the actual contact length with the external square shaft to be less than the insert thickness (axial length). In this context, simply increasing the thickness of a single metal insert 3 does not increase the actual contact length, making it difficult to improve the stress concentration phenomenon in the transmission component 2. Additionally, increasing the thickness will increase the manufacturing difficulty and cost of a single metal insert 3. When multiple metal inserts 3 are provided, each metal insert 3 contacts the output shaft 11, thereby increasing the actual length of the contact section, improving the stress concentration phenomenon of the transmission component 2, and the thinner metal insert 3 is simple to manufacture and has a lower cost.

[0020] Furthermore, when the output shaft 11 is inserted into the center hole 21 of the transmission component 2, it simultaneously engages with the injection-molded inner wall of the transmission component 2 and the metal insert 3. This ensures that the length of the metal contact section meets product usage requirements while also guaranteeing the length of the plastic contact section, thereby improving the overall structural strength of the components, extending their service life, and enhancing product quality.

[0021] Example 2: See Figure 5 In this embodiment, two metal inserts 3 are stacked at the opening of the central hole 21 facing the output shaft 11. Each metal insert 3 has an opening 31 of the same size as the central hole 21 in its center, and the inner walls 311 of both openings 31 are flush with the inner wall 211 of the central hole 21. When the output shaft 11 is inserted into the central hole 21 of the transmission component 2, from the inside of the central hole 21 outwards, the outer circumference of the output shaft 11 axially abuts against the inner wall 211 of the central hole 21, the inner wall 311 of one metal insert 3, and the inner wall 311 of the other metal insert 3 in sequence. The rest is the same as in Embodiment 1. Of course, if the inner walls 311 of the two openings 31 are flush with each other but not flush with the inner wall 211 of the center hole 21, then when the output shaft 11 is inserted into the center hole 21 of the transmission member 2, the outer peripheral side of the output shaft 11 in the axial direction abuts against the inner wall 311 of one metal insert 3 and the inner wall 311 of the other metal insert 3, but not against the inner wall 211 of the center hole 21.

[0022] Of course, the structure of the metal insert of this utility model is not limited to the above embodiments, and can also be, for example... Figure 6The two metal inserts 3 can be integrally formed, that is, the axial dimension of the metal insert 3 can be increased. For example... Figure 7 The metal insert 3 includes a pair of metal insert arms 30 arranged radially symmetrically with respect to the output shaft 11. Each metal insert arm 30 is in the shape of "[". The pair of metal insert arms 30 are embedded in the transmission member 2 and cooperate with each other to form an opening 31.

[0023] Of course, the switch of this utility model is not limited to the automatic transfer switch described in the above embodiments. That is, the application of the transmission component is not limited to automatic transfer switch. It can be used in any switch that has an operating mechanism output shaft that drives the moving contact to rotate back and forth.

Claims

1. A switch comprising an operating mechanism (1) and a contact system, between which there is a transmission member (2) which transmits torque between an output shaft (11) of the operating mechanism (1) and a movable contact of the contact system, characterized in that: At least one metal insert (3) is provided in the transmission component (2), and the output shaft (11) is inserted into the center hole (21) of the transmission component (2) and abuts against the metal insert (3).

2. A switch according to claim 1, characterised in that: The metal insert (3) has an opening (31) in the middle with the same size as the central hole (21). When the output shaft (11) is inserted into the central hole (21) of the transmission component (2), its outer circumferential surface abuts against the inner surface of the central hole (21) and the opening (31).

3. A switch according to claim 1, wherein: The metal insert (3) has anti-slip portions (32) formed on its outer surfaces.

4. A switch according to claim 1, wherein: The number of metal inserts (3) is two, and they are stacked along the axial direction of the output shaft (11).

5. A switch according to claim 2, wherein: The metal insert (3) includes a pair of identical metal insert arms (30) that are symmetrically distributed radially around the output shaft (11), and the pair of metal insert arms (30) cooperate with each other to form the opening (31).

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