Contact mechanism and switch unit

Abstract

A contact mechanism and a switch unit relate to the technical field of low-voltage apparatuses. The contact mechanism comprises a moving contact and a static contact. Wherein at least one end of the moving contact is provided with a first contact group, and the first contact group comprises a first clamping part and a first beating part; the static contact comprises a second contact group corresponding to the first contact group, and the second contact group comprises a first matching part used for being clamped and matched with the first clamping part and a second clapping part used for being in clapping contact with the first clapping part; when the moving contact is driven to rotate to approach the static contact, the first clamping part contacts the static contact before the first clapping part. When the moving contact is driven to rotate to be away from the static contact, the first clamping part is separated from the static contact at the first clapping part. According to the contact mechanism, the short-time withstand current performance of the contact mechanism can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of low-voltage electrical appliances, in particular to a contact mechanism and a switch unit. Background Art

[0002] The isolating switch is a switch device mainly used for "isolating power supply, switching operation, connecting and disconnecting low current circuits". The designed structure varies according to different application scenarios (such as indoor or outdoor use), different isolation currents or voltages, and different functions. The operating principle of the isolating switch is generally: the energy storage spring is stored by rotating the handle, and then the contact part is driven to open and close by releasing the energy storage spring.

[0003] At present, the requirements for the DC voltage of the disconnector are getting higher and higher. Accordingly, in order to enable the disconnector to extinguish the high-voltage arc, it is necessary to either equip it with a stronger arc extinguishing system or provide a device that can improve the short-time withstand current performance of the contact mechanism of the disconnector. Among them, improving the short-time withstand current performance of the contact mechanism of the disconnector can fundamentally improve the problem of damage to the contact mechanism due to arc erosion. Therefore, how to provide a new contact mechanism to improve the short-time withstand current performance of the contact mechanism is important and meaningful. Utility Model Content

[0004] The utility model aims to provide a contact mechanism and a switch unit, which can improve the short-time current withstand performance of the contact mechanism.

[0005] The embodiment of the utility model is achieved as follows:

[0006] In one aspect of the utility model, a contact mechanism is provided, the contact mechanism comprises a moving contact and a stationary contact; wherein, at least one end of the moving contact is provided with a first contact group, the first contact group comprises a first clamping portion and a first snap-fit ​​portion; the stationary contact comprises a second contact group corresponding to the first contact group, the second contact group comprises a first matching portion for clamping and matching with the first clamping portion and a second snap-fit ​​portion for snap-fitting with the first snap-fit ​​portion; when the moving contact is driven to rotate to approach the stationary contact, the first clamping portion contacts the stationary contact before the first snap-fit ​​portion; when the moving contact is driven to rotate to move away from the stationary contact, the first clamping portion detaches from the stationary contact after the first snap-fit ​​portion. The contact mechanism can improve the short-time withstand current performance of the contact mechanism.

[0007] Optionally, when the moving contact and the static contact are closed or opened, the rotation path of the first clamping part is smaller than the rotation path of the first snapping part.

[0008] Optionally, the first clamping portion includes two clamping plates that are opposite to and spaced apart from each other, the arrangement direction of the two clamping plates is the same as the arrangement direction of the first clamping portion and the first snapping portion, and the two clamping plates are used to cooperate with each other to clamp the first matching portion.

[0009] Optionally, the length of the first snapping portion along the first direction is greater than the length of the first clamping portion along the first direction, and the first direction is perpendicular to the rotation axis direction of the moving contact.

[0010] Optionally, the first snap-fitting part and the second snap-fitting part respectively include two, the two first snap-fitting parts are distributed on opposite sides of the first clamping part, the two second snap-fitting parts are distributed on opposite sides of the first matching part, and the arrangement direction of the two first snap-fitting parts is parallel to the rotation axis of the moving contact.

[0011] Optionally, the static contacts include two static contacts, which are distributed at opposite ends of the moving contact, and the opposite ends of the moving contact are respectively provided with a first contact group; the moving contact is driven to rotate, and the two groups of first contact groups at opposite ends of the moving contact can respectively close or open the switch with the second contact groups of the two static contacts.

[0012] Another aspect of the utility model provides a switch unit, which includes the above-mentioned contact mechanism, and further includes an arc extinguishing chamber arranged between the static contact and the moving contact of the contact mechanism.

[0013] Optionally, the switch unit further includes gas generating parts arranged on both sides of the contact support of the contact mechanism.

[0014] Optionally, the arc extinguishing chamber includes a body and a first part and a second part respectively arranged on the body, the first part is adapted to the shape of the first clamping part, and the second part is adapted to the shape of the first clasping part.

[0015] Optionally, the first clamping part includes two clamping plates that are opposite to and spaced apart from each other, and the arrangement direction of the two clamping plates is the same as the arrangement direction of the first clamping part and the first clapping part; the first part includes a protruding structure protruding on the main body, the protruding structure is formed with an arc-striking groove, and the clamping plate is at least partially accommodated in the corresponding arc-striking groove.

[0016] The beneficial effects of the utility model include:

[0017] The contact mechanism provided by the present application includes a moving contact and a stationary contact; wherein, at least one end of the moving contact is provided with a first contact group, the first contact group includes a first clamping portion and a first snapping portion; the stationary contact includes a second contact group corresponding to the first contact group, the second contact group includes a first matching portion for clamping and matching with the first clamping portion and a second snapping portion for snapping and contacting with the first snapping portion; when the moving contact is driven to rotate to approach the stationary contact, the first clamping portion contacts the stationary contact before the first snapping portion; when the moving contact is driven to rotate to move away from the stationary contact, the first clamping portion is separated from the stationary contact after the first snapping portion. The present application sets a first contact group at at least one end of the moving contact, and makes the first contact group include the first snapping portion and the first clamping portion at the same time, and makes the first clamping portion serve as an arc contact, and when the current increases, the clamping force of the first clamping portion increases, and the repelling force is small, so that the contact mechanism can still maintain good performance after being ablated, thereby improving the short-time current withstand performance of the contact mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the utility model and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 One of the schematic diagrams of the contact mechanism structure provided by the embodiment of the utility model;

[0020] Figure 2 The second schematic diagram of the contact mechanism structure provided by the embodiment of the utility model;

[0021] Figure 3 The third schematic diagram of the contact mechanism structure provided by the embodiment of the utility model;

[0022] Figure 4 A schematic diagram of the structure of the contact mechanism and the arc extinguishing chamber provided in the embodiment of the utility model;

[0023] Figure 5 A schematic diagram of the structure of a switch unit provided in an embodiment of the utility model.

[0024] Icons: 10-moving contact; 11-first contact group; 111-first clamping part; 111A-clamping plate; 112-first snapping part; 112A-first snapping point; 20-static contact; 21-second contact group; 211-first matching part; 212-second snapping part; 212A-second snapping point; 30-arc extinguishing chamber; 31-main body; 32-first part; 321-protrusion structure; 3211-sub-protrusion; 322-arc striking groove; 33-second part; a-first direction; 40-gas producing part. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0028] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0029] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0030] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] Driven by intelligent and automated high-tech, the smart home industry has entered a period of rapid development. The smart home industry is facing new challenges and opportunities in the transformation of technology, market and industry.

[0032] According to the function, the smart home can be divided into eight modules: entertainment system, security system, control system, lighting system, kitchen and bathroom appliance system, network and communication system, health care system, and indoor environment system. The eight modules work together to realize the whole house intelligence.

[0033] Please refer to Figure 1 and Figure 2 The present embodiment provides a contact mechanism, which includes a moving contact 10 and a stationary contact 20; wherein, at least one end of the moving contact 10 is provided with a first contact group 11, the first contact group 11 includes a first clamping portion 111 and a first snap-fit ​​portion 112; the stationary contact 20 includes a second contact group 21 corresponding to the first contact group 11, the second contact group 21 includes a first matching portion 211 for clamping and matching with the first clamping portion 111 and a second snap-fit ​​portion 212 for snap-fitting with the first snap-fit ​​portion 112; when the moving contact 10 is driven to rotate to approach the stationary contact 20, the first clamping portion 111 contacts the stationary contact 20 before the first snap-fit ​​portion 112; when the moving contact 10 is driven to rotate to move away from the stationary contact 20, the first clamping portion 111 is separated from the stationary contact 20 after the first snap-fit ​​portion 112. The contact mechanism can improve the short-time withstand current performance of the contact mechanism.

[0034] Among them, the above-mentioned moving contact 10 can be a single-breakpoint type or a double-breakpoint type. When the moving contact 10 is a single-breakpoint type, the moving contact 10 is provided with a first contact group 11 at one end for cooperating with the static contact 20; when the moving contact 10 is a double-breakpoint type, the moving contact 10 can be provided with the first contact group 11 at one end or at both ends.

[0035] The first contact group 11 includes a first clamping portion 111 and a first snapping portion 112 , that is, the same end of the moving contact 10 can achieve both snapping contact and clamping contact with the stationary contact 20 .

[0036] Correspondingly, the stationary contact 20 has a second contact group 21 corresponding to the first contact group 11 of the moving contact 10. It should be noted that when the moving contact 10 is a double-breakpoint type, the stationary contact 20 should include two, and the two stationary contacts 20 are respectively provided with a second contact group 21.

[0037] The second contact group 21 includes a first matching portion 211 and a second snap-fit ​​portion 212. The first matching portion 211 is used to match with the first clamping portion 111 to achieve plug-in contact between the moving contact 10 and the stationary contact 20.

[0038] The second snap-fitting portion 212 is used to cooperate with the first snap-fitting portion 112 to achieve snap-fitting contact between the moving contact 10 and the stationary contact 20. The first snap-fitting portion 112 is provided with a first snap-fitting point 112A, and the second snap-fitting portion 212 is provided with a second snap-fitting point 212A. When the first snap-fitting portion 112 and the second snap-fitting portion 212 snap-fit ​​into contact, the first snap-fitting point 112A and the second snap-fitting point 212A are in contact and connected.

[0039] It should be noted that if Figure 3 As shown, using the contact structure provided by the present application, the plug-in contact end is subjected to force in two directions, one direction is F X , the left and right directions are subject to clamping force. When the current becomes larger, the contact mechanism of this structure is adopted, and its F X The clamping force in the direction will gradually increase; the other direction is F Z The contact mechanism of the present application can rely on the mechanism spring of the isolating switch to compress the force of the moving contact 10 and the static contact 20 to repel each other, that is, the contact mechanism of the present application will make the repelling force smaller. Therefore, the contact mechanism provided by the present application is more conducive to increasing the short-time withstand current performance.

[0040] Furthermore, in the present embodiment, the movable contact 10 is driven to rotate to approach the stationary contact 20, so that when the contact structure is closed, the first clamping portion 111 can contact the stationary contact 20 before the first snap-fit ​​portion 112; and when the movable contact 10 is driven to rotate to move away from the stationary contact 20, so that when the contact mechanism is opened, the first clamping portion 111 can be separated from the stationary contact 20 after the first snap-fit ​​portion 112. In other words, the first clamping portion 111 of the present application is an arc contact.

[0041] It should be noted that when the isolating switch is opened under load, an arc will be generated between the moving contact 10 and the static contact 20. When considering such a load opening situation, the isolating switches currently on the market often use an arc extinguishing chamber 30 to quickly extinguish the arc. However, no matter how fast the arc is extinguished, it will cause greater ablation and damage to the contacts that generate the arc. For this reason, the present application sets the first clamping portion 111 as an arc contact specifically for ablation, so that the contact mechanism can maintain good performance even after being ablated, so that the short-time current withstand performance of the contact mechanism can be further improved.

[0042] In summary, the contact mechanism provided by the present application includes a moving contact 10 and a stationary contact 20; wherein, at least one end of the moving contact 10 is provided with a first contact group 11, and the first contact group 11 includes a first clamping portion 111 and a first snap-fit ​​portion 112; the stationary contact 20 includes a second contact group 21 corresponding to the first contact group 11, and the second contact group 21 includes a first matching portion 211 for clamping and matching with the first clamping portion 111 and a second snap-fit ​​portion 212 for snap-fitting contact with the first snap-fit ​​portion 112; when the moving contact 10 is driven to rotate to approach the stationary contact 20, the first clamping portion 111 contacts the stationary contact 20 before the first snap-fit ​​portion 112; when the moving contact 10 is driven to rotate to move away from the stationary contact 20, the first clamping portion 111 disengages from the stationary contact 20 after the first snap-fit ​​portion 112. The present application sets a first contact group 11 at at least one end of the moving contact 10, and makes the first contact group 11 include a first snapping portion 112 and a first clamping portion 111 at the same time, and makes the first clamping portion 111 serve as an arc contact. When the current becomes larger, the clamping force of the first clamping portion 111 increases, and the repelling force is smaller. In this way, the contact mechanism can still maintain good performance after being ablated, thereby improving the short-time current withstand performance of the contact mechanism.

[0043] In order to make the first clamping portion 111 and the first matching portion 211 clamp and match first, and then the first snapping portion 112 and the second snapping portion 212 snap together when closing the switch; and to make the first snapping portion 112 and the second snapping portion 212 separate first, and then the first clamping portion 111 and the first matching portion 211 separate when opening the switch, in this embodiment, please refer to Figure 1 and Figure 3 Optionally, when the moving contact 10 and the stationary contact 20 are closed or opened, the rotation path of the first clamping portion 111 is smaller than the rotation path of the first snapping portion 112 .

[0044] Of course, if it is necessary to achieve that the first clamping part 111 and the first matching clamp are first matched when closing the switch, and the first clamping part 111 and the first matching part 211 are separated when opening the switch, in addition to the above method, it can also be achieved by setting different rotation speeds for the first clamping part 111 and the first snap-fit ​​part 112 (for example, when closing the switch, the rotation speed of the first clamping part 111 is greater than the rotation speed of the first snap-fit ​​part 112, and when opening the switch, the rotation speed of the first clamping part 111 is less than the rotation speed of the first snap-fit ​​part 112), or setting the rotation time points of the two to be different (for example, when closing the switch, the first clamping part 111 rotates first, and the first snap-fit ​​part 112 rotates later; when opening the switch, the first clamping part 111 rotates later, and the first snap-fit ​​part 112 rotates first). This is not specifically limited in the present application.

[0045] Optionally, see Figure 1 The first clamping portion 111 includes two clamping plates 111A that are opposite to and spaced apart from each other. The arrangement direction of the two clamping plates 111A is the same as the arrangement direction of the first clamping portion 111 and the first snapping portion 112 (the arrangement direction of the two clamping plates 111A is parallel to the rotation axis direction of the moving contact 10). The two clamping plates 111A are used to cooperate with each other to clamp the first matching portion 211.

[0046] Of course, in other embodiments, the first clamping portion 111 may also be a boss protruding from the moving contact 10 , the extension direction of the boss being perpendicular to the rotation axis direction of the moving contact 10 ; and the first matching portion 211 is correspondingly provided with two clamping plates 111A.

[0047] Optionally, the length of the first snap-fit ​​portion 112 along the first direction a is greater than the length of the first clamping portion 111 along the first direction a, and the first direction a is perpendicular to the direction of the rotation axis of the moving contact 10. In other words, along the radial direction of the moving contact 10, the size of the first snap-fit ​​portion 112 is greater than the size of the first clamping portion 111. In this way, the force arm of the first clamping portion 111 as an arc contact is smaller than that of the first snap-fit ​​portion 112 as a main contact, so that the repulsion force actually generated by the contact mechanism is smaller. Figure 2 As shown, the first direction a is perpendicular to the rotation axis of the moving contact 10 .

[0048] Please refer to Figure 1 The first snap-fitting portion 112 and the second snap-fitting portion 212 respectively include two first snap-fitting portions 112 distributed on opposite sides of the first clamping portion 111, and the two second snap-fitting portions 212 distributed on opposite sides of the first matching portion 211, and the arrangement direction of the two first snap-fitting portions 112 is parallel to the rotation axis of the moving contact 10.

[0049] That is, the first snap-fitting parts 112 include two, and the two first snap-fitting parts 112 are distributed on opposite sides of the first clamping part 111; the second snap-fitting parts 212 also include two, and the two second snap-fitting parts 212 are also correspondingly distributed on opposite sides of the first matching part 211, and the two first snap-fitting parts 112 are respectively arranged correspondingly to the two second snap-fitting parts 212.

[0050] Optionally, the static contacts 20 include two static contacts 20, which are distributed at opposite ends of the moving contact 10, and the opposite ends of the moving contact 10 are respectively provided with first contact groups 11; the moving contact 10 is driven to rotate, and the two groups of first contact groups 11 at opposite ends of the moving contact 10 can respectively close or open the circuit with the second contact groups 21 of the two static contacts 20.

[0051] That is to say, the contact mechanism provided in the present application adopts a double-breakpoint type, and the first contact groups 11 are respectively provided at the opposite ends of the moving contact 10 , and correspondingly, the two stationary contacts 20 are also provided with second contact groups 21 .

[0052] Another aspect of the present invention is to refer to Figure 5 , a switch unit is provided, the switch unit includes the above-mentioned contact mechanism. Since the specific structure and effect of the contact mechanism have been elaborated and explained in detail in the previous text, the present application will not repeat them here.

[0053] Optionally, see Figure 4 The switch unit further includes an arc extinguishing chamber 30 disposed between the static contact 20 and the moving contact 10 of the contact mechanism. The arc extinguishing chamber 30 is used to introduce the arc generated between the moving contact 10 and the static contact 20 into the arc extinguishing chamber 30 and extinguish the arc.

[0054] The arc extinguishing chamber 30 may include a body 31 and a first portion 32 and a second portion 33 respectively arranged on the body 31, wherein the first portion 32 is adapted to the shape of the first clamping portion 111, and the second portion 33 is adapted to the shape of the first clasping portion 112. The present application provides the first portion 32 and the second portion 33 on the arc extinguishing chamber 30 in a corresponding manner, and makes the first portion 32 and the second portion 33 respectively adapted to the shapes of the first clamping portion 111 and the first clasping portion 112, so that the arc generated at the first clamping portion 111 and the arc generated at the first clasping portion 112 can be quickly extinguished by the arc extinguishing chamber 30.

[0055] Please refer to Figure 4 The above-mentioned first clamping part 111 includes two clamping plates 111A that are opposite and spaced apart, and the arrangement direction of the two clamping plates 111A is the same as the arrangement direction of the first clamping part 111 and the first clapping part 112; the first part 32 includes a protruding structure 321 protruding on the main body 31, and the protruding structure 321 is formed with an arc-striking groove 322, and the clamping plate 111A is at least partially accommodated in the corresponding arc-striking groove 322.

[0056] Exemplarily, the protrusion structure 321 may include three spaced sub-protrusions 3211, the gap between two adjacent sub-protrusions 3211 forms an arc-striking groove 322, and the clamping plate 111A is at least partially accommodated in the corresponding arc-striking groove 322. It should be understood that the protrusion structure 321 including three sub-protrusions 3211 is only an example and is not a limitation of the present application.

[0057] It should be noted that the gap between any two adjacent sub-protrusions 3211 among the three sub-protrusions 3211 can form an arc-striking groove 322, and the clamping plate 111A is at least partially located in the arc-striking groove 322. This can help guide the direction of the arc, so that the arc can quickly enter the arc extinguishing chamber 30, thereby reliably and quickly extinguishing the arc.

[0058] Furthermore, in this embodiment, the switch unit may further include gas generating parts 40 disposed on both sides of the contact support of the contact mechanism, such as Figure 2 The specific structure of the gas generating member 40 is not specifically limited in this application, and those skilled in the art can set it according to actual conditions.

[0059] The embodiment of the present application also provides an electrical equipment, the electrical equipment is equipped with an isolating switch, the isolating switch is provided with the above-mentioned switch unit, and the electrical equipment can be equipped with at least one of the following: a distribution box, a cable, a distribution cabinet, a motor, a switch socket, a lamp, an air conditioner, an electric water heater, an electric meter, a camera, a telephone, a computer, etc. Such electrical equipment can use the related structure of the isolating switch of the present application to realize intelligent management, but it is not limited to the above-mentioned intelligently managed electrical equipment, and can also be used in non-intelligent electrical equipment in traditional industries.

[0060] The embodiment of the present application also provides an electrical equipment, and the aforementioned isolating switch is applied to the electrical equipment. The electrical equipment can be used for whole-house intelligence, and can be applied to smart homes and the Internet of Things industry to achieve whole-house intelligent management.

[0061] It is understood that the above scenarios are only examples and do not constitute a limitation on the application scenarios of the technical solutions provided in the embodiments of the present application. The technical solutions of the present application can also be applied to other scenarios. For example, it is known to those skilled in the art that with the evolution of the system architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of the present application are also applicable to similar technical problems.

[0062] The serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0063] The steps in the method of the embodiment of the present application can be adjusted in order, combined and deleted according to actual needs.

[0064] The units in the device of the embodiment of the present application can be merged, divided and deleted according to actual needs.

[0065] In the present application, the same or similar terminology concepts, technical solutions and / or application scenario descriptions are generally described in detail only the first time they appear. When they appear again later, they are generally not repeated for the sake of brevity. When understanding the technical solutions and other contents of the present application, for the same or similar terminology concepts, technical solutions and / or application scenario descriptions that are not described in detail later, reference can be made to the previous related detailed descriptions.

[0066] In the present application, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] The various technical features of the technical solution of the present application can be arbitrarily combined. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of the present application.

[0068] The above description is only an optional embodiment of the utility model and is not intended to limit the utility model. For those skilled in the art, the utility model can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

[0069] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present utility model will not further describe various possible combinations.

Claims

1. A contact mechanism, characterized in that: The invention comprises a moving contact (10) and a stationary contact (20); wherein at least one end of the moving contact (10) is provided with a first contact group (11), the first contact group (11) comprising a first clamping portion (111) and a first snapping portion (112); the stationary contact (20) comprises a second contact group (21) corresponding to the first contact group (11), the second contact group (21) comprising a first matching portion (211) for clamping and matching with the first clamping portion (111) and a second snapping portion (212) for snapping and contacting with the first snapping portion (112); When the moving contact (10) is driven to rotate so as to approach the stationary contact (20), the first clamping portion (111) contacts the stationary contact (20) before the first snapping portion (112); when the moving contact (10) is driven to rotate so as to move away from the stationary contact (20), the first clamping portion (111) disengages from the stationary contact (20) after the first snapping portion (112).

2. The contact mechanism according to claim 1, characterized in that: When the moving contact (10) and the stationary contact (20) are closed or opened, the rotation path of the first clamping portion (111) is smaller than the rotation path of the first snapping portion (112).

3. The contact mechanism according to claim 1, characterized in that: The first clamping portion (111) comprises two clamping plates (111A) that are arranged opposite to each other and spaced apart from each other. The arrangement direction of the two clamping plates (111A) is the same as the arrangement direction of the first clamping portion (111) and the first snapping portion (112). The two clamping plates (111A) are used to cooperate with each other to clamp the first matching portion (211).

4. The contact mechanism according to claim 1, characterized in that: The length of the first snapping portion (112) along the first direction (a) is greater than the length of the first clamping portion (111) along the first direction (a), and the first direction (a) is perpendicular to the rotation axis direction of the moving contact (10).

5. The contact mechanism according to claim 1, characterized in that: The first snap-fitting parts (112) and the second snap-fitting parts (212) respectively include two, the two first snap-fitting parts (112) are distributed on two opposite sides of the first clamping part (111), and the two second snap-fitting parts (212) are distributed on two opposite sides of the first matching part (211), and the arrangement direction of the two first snap-fitting parts (112) is parallel to the rotation axis of the moving contact (10).

6. The contact mechanism according to any one of claims 1 to 5, characterized in that: The static contacts (20) include two static contacts (20), which are distributed at opposite ends of the moving contact (10), and the opposite ends of the moving contact (10) are respectively provided with first contact groups (11); the moving contact (10) is driven to rotate, and the two groups of the first contact groups (11) at the opposite ends of the moving contact (10) can respectively close or open the circuit with the second contact groups (21) of the two static contacts (20).

7. A switch unit, characterized in that: It comprises the contact mechanism as claimed in any one of claims 1 to 6; the switch unit further comprises an arc extinguishing chamber (30) arranged between the stationary contact (20) and the moving contact (10) of the contact mechanism.

8. The switch unit according to claim 7, characterized in that: The switch unit also includes gas generating parts (40) arranged on both sides of the contact support of the contact mechanism.

9. The switch unit according to claim 7, characterized in that: The arc extinguishing chamber (30) comprises a body (31) and a first part (32) and a second part (33) respectively arranged on the body (31); the first part (32) is adapted to the shape of the first clamping part (111), and the second part (33) is adapted to the shape of the first clasping part (112).

10. The switch unit according to claim 9, characterized in that The first clamping portion (111) comprises two clamping plates (111A) which are arranged opposite to each other and spaced apart, and the arrangement direction of the two clamping plates (111A) is the same as the arrangement direction of the first clamping portion (111) and the first clasping portion (112); the first part (32) comprises a protruding structure (321) protruding from the main body (31), and the protruding structure (321) is formed with an arc-striking groove (322), and the clamping plate (111A) is at least partially accommodated in the corresponding arc-striking groove (322).

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