Overload switch easy to assemble

Abstract

The overload switch comprises an upper shell and a bottom cover which are buckled with each other and form an inner cavity, and a contact piece assembly and a reset piece which are arranged in the inner cavity, a movable channel used for accommodating the reset piece is integrally formed in the upper shell, the upper shell defines a mounting port of the inner cavity relative to the direction of the movable channel, and the mounting port is provided with an opening. The reset piece, the contact piece assembly and the bottom cover are arranged to be placed into the inner cavity along the installation opening. An inlet of the movable channel is provided with a buckling portion, the reset piece is provided with a buckling matching portion, the buckling matching portion is buckled into the movable channel through the buckling portion, and the reset piece is limited to move in the movable channel and at least abuts against and is matched with the contact piece assembly in the overload state, so that interference between parts and components is reduced, and the reliability of the reset piece is improved. And the assembly difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, and particularly relates to an overload switch with simple assembly. Background Art

[0002] Overload protection refers to an overload protection device installed to prevent the main power line from being damaged due to overheating of the protector caused by overload. The overload protection switch is suitable for protecting the safety of household, industrial and other electronic and electrical equipment. If the voltage is unstable or other electronic components are defective, etc., it will cause excessive current, which is likely to damage the electronic components, and is more likely to cause short circuits such as burning, and even electric shock and fire, resulting in unnecessary accidents.

[0003] An existing overload switch usually includes a housing, a contact piece assembly arranged in the housing, and a button for actuating the contact piece assembly. The housing is spliced by two symmetrical half-housings. Open slots are provided on both half-housings. The button is embedded in the open slot in one of the half-housings through a locking nut, and the button is placed in the locking nut in advance, and then the other half-housing is buckled. During this period, the contact piece assembly needs to be placed one by one. The assembly steps of this kind of overload switch are more, and when the two half-housings are not fully buckled, the locking nut and the contact piece assembly inside are prone to displacement. Summary of the Utility Model

[0004] Aiming at the deficiencies of the existing technology, the purpose of the utility model is to provide an overload switch with simple assembly.

[0005] The above technical purpose of the utility model is achieved through the following technical solutions:

[0006] An overload switch with simple assembly includes an upper shell and a bottom cover that are buckled together to form an inner cavity, and a contact piece assembly and a reset member arranged in the inner cavity. An activity channel for accommodating the reset member is integrally formed in the upper shell, and an installation opening of the inner cavity is defined by the upper shell in the direction of the activity channel. The reset member, the contact piece assembly and the bottom cover are arranged to be placed into the inner cavity along the installation opening.

[0007] A buckling portion is provided at the entrance of the activity channel, and a buckling cooperation portion is provided on the reset member. The buckling cooperation portion is buckled into the activity channel through the buckling portion. The reset member is limited to move in the activity channel and is at least in contact and cooperation with the contact piece assembly in the overload state.

[0008] Further, a limiting portion is provided at the top of the activity channel. The installation opening and the activity channel correspond to both ends of the upper shell. The reset member is constrained between the limiting portion and the buckling portion.

[0009] Further, the contact piece assembly at least includes a protection contact piece, which is configured to act and disengage from the electrical engagement position in an overload state, and the reset member moves within the movable channel in response to the overload action of the protection contact piece.

[0010] Further, a contact portion is provided at the bottom of the reset member, and the contact portion abuts against the protection contact piece both in the overload position and the electrical engagement position.

[0011] Further, the protection contact piece refers to a bimetallic strip. The contact piece assembly further includes a first contact piece connected to the bimetallic strip and a second contact piece for lapping with the bimetallic strip.

[0012] Further, a spring is also sleeved on the reset member. The spring is arranged in a free state between the snap-fit portion and the end of the movable channel, and an overload stroke is spaced within the movable channel. The overload stroke corresponds to the overload action amount of the protection contact piece.

[0013] Further, the snap portion is provided with a first guiding inclined surface facing the mounting opening, and / or the snap-fit portion is provided with a second guiding inclined surface facing the snap portion.

[0014] Further, a positioning table corresponding to the end of the contact piece assembly is provided in the upper shell, and the contact piece assembly is positioned between the positioning table and the bottom cover.

[0015] Further, positioning holes are provided on the bottom cover, and connecting legs extending out of the positioning holes are provided on the contact piece assembly. The contact piece assembly is inserted and positioned with the positioning holes through the connecting legs and is placed into the inner cavity and the mounting opening together with the bottom cover.

[0016] Further, the upper shell and the bottom cover are coplanar and together define the bottom plane of the overload switch.

[0017] Compared with the prior art, the present utility model has the following advantages and beneficial effects:

[0018] In the present utility model, the upper shell of the overload switch is integrally formed, and a mounting opening for assembly is defined at one end of the upper shell, and a movable channel for accommodating the reset member is defined at the other end of the upper shell. The movable channel communicates with the mounting opening, so that during the assembly process, only the reset member, the contact piece assembly and the bottom cover need to be placed into the inner cavity unidirectionally from the mounting opening. The reset member is limited by being snapped into the movable channel through the snap-fit portion thereon, thereby reducing the number of components and component interference and reducing the assembly difficulty;

[0019] During the assembly process, the spring and the reset member are placed into the movable channel together. The contact piece assembly is pre-positioned on the bottom cover and is placed into the inner cavity together with the bottom cover, thereby simplifying the assembly steps and eliminating the need to consider the crosstalk and displacement of the components during assembly. Brief Description of the Drawings

[0020] Figure 1 is the overall structural schematic diagram of the present utility model;

[0021] Figure 2 is the cross-sectional view of the present utility model;

[0022] Figure 3 is the cross-sectional view of the upper shell and the reset member of the present utility model;

[0023] Figure 4 is the structural schematic diagram of the installation cavity of the present utility model;

[0024] Figure 5 is the structural schematic diagram of the contact piece assembly and the bottom cover of the present utility model;

[0025] Figure 6 is the exploded schematic diagram of the contact piece assembly and the bottom cover of the present utility model;

[0026] Figure 7 is the structural schematic diagram of the overload state of the present utility model;

[0027] In the figure:

[0028] 1. Upper shell; 1.1. Activity channel; 1.2. Installation opening; 1.3. Buckling part; 1.4. Limiting part; 1.5. First guiding inclined surface; 1.6. Positioning table; 1.7. Buckling groove; 2. Bottom cover; 2.1. Buckling block; 2.2. Positioning hole; 3. Inner cavity; 4. Contact piece assembly; 4.1. Protection contact piece; 4.2. First contact piece; 4.3. Second contact piece; 4.4. Connecting support leg; 4.5. Positioning support leg; 5. Reset member; 5.1. Buckling and mating part; 5.2. Abutting part; 5.3. Second guiding inclined surface; 6. Spring; Specific embodiments

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0030] It should be understood that although the terms upper, middle, lower, top, one end, etc. appear in this text to describe various elements, these elements are not limited by these terms. These terms are only used to distinguish the elements from each other for easy understanding, rather than to define any directional or sequential limitations.

[0031] Such as Figure 1-7As shown in the figure, an overload switch with simple assembly includes an upper shell 1 and a bottom cover 2 that are buckled together to form an inner cavity 3, and a contact piece assembly 4 and a reset member 5 disposed in the inner cavity 3. An active channel 1.1 for accommodating the reset member 5 is integrally formed in the upper shell 1. The reset member 5 passes through the active channel 1.1, and one end extends out of the active channel 1.1 and the outer shell for reset operation. The upper shell 1 defines an installation opening 1.2 of the inner cavity 3 in the direction of the active channel 1.1. The installation opening 1.2 is disposed away from the active channel 1.1, so as to define an installation opening 1.2, an inner cavity 3, and an active channel 1.1 extending along the installation direction on the upper shell 1. The reset member 5, the contact piece assembly 4, and the bottom cover 2 are arranged to be inserted into the inner cavity 3 along the installation opening 1.2, and the bottom cover 2 corresponds to the installation opening 1.2 and closes the inner cavity 3.

[0032] As a further implementation manner for the installation of the reset member 5, a buckling portion 1.3 is provided at the entrance of the active channel 1.1, and a buckling cooperation portion 5.1 is provided on the reset member 5. During the assembly process, the buckling cooperation portion 5.1 follows the reset member 5 and is buckled into the active channel 1.1 through the buckling portion 1.3. The reset member 5 is limited to move within the active channel 1.1 and is in abutting cooperation with at least the contact piece assembly 4 in the overload state. Through the above improvement, the reset member 5, the contact piece assembly 4, and the bottom cover 2 are all inserted into the inner cavity 3 from the installation opening 1.2 along the same direction, so as to simplify the assembly steps.

[0033] Among them, a limiting portion 1.4 is provided at the top of the active channel 1.1. The limiting portion 1.4 and the buckling portion 1.3 are correspondingly arranged at both ends of the active channel 1.1. The installation opening 1.2 and the active channel 1.1 correspond to both ends of the upper shell 1, and the reset member 5 is constrained between the limiting portion 1.4 and the buckling portion 1.3.

[0034] Preferably, the buckling portion 1.3 is provided with a first guiding inclined surface 1.5 facing the installation opening 1.2, and / or the buckling cooperation portion 5.1 is provided with a second guiding inclined surface 5.3 facing the buckling portion 1.3. Through the above improvement, it is convenient for the reset member 5 to be buckled into the active channel 1.1.

[0035] In addition, the opposite surfaces of the buckling portion 1.3 and the buckling cooperation portion 5.1 are planes to ensure the cooperation stability of the reset member 5 at the bottom of the active channel 1.1.

[0036] From Figure 3 it can be seen that specifically, the buckling portion 1.3 can be selected as a plurality of buckling blocks arranged at intervals along the circumferential direction at the entrance of the active channel 1.1, and the buckling cooperation portion 5.1 can be selected as a buckling cooperation ring provided around the reset member 5.

[0037] In some other embodiments, a spring 6 is further sleeved on the reset member 5. The spring 6 is used to limit the position of the reset member 5 in the movable channel 1.1 to prevent the reset member 5 from sliding excessively in the movable channel 1.1 when the overload switch changes its position. The spring 6 is positioned on the buckling portion 1.3 of the reset member 5 and is buckled into the movable channel 1.1 together with the buckling portion 1.3.

[0038] As Figure 5 and Figure 6 shown, preferably, the contact piece assembly 4 is pre-positioned on the bottom cover 2, for example, in a way that the contact piece is inserted into the bottom cover 2. Thus, during the assembly process, after the reset member 5 is placed into the movable channel 1.1, it can be limited within the movable channel 1.1. The contact piece assembly 4 can be placed into the inner cavity 3 together with the bottom cover 2, and the bottom cover 2 is buckled at the installation opening 1.2 of the upper shell 1. Therefore, there is no need to consider the displacement of the reset member 5 and the contact piece assembly 4 during the entire assembly process, which is beneficial to improving the assembly efficiency.

[0039] Furthermore, the upper shell 1 can also be positioned with the installation opening 1.2 facing upward, and then the reset member 5 and the reset, as well as the contact piece assembly 4 and the bottom cover 2, can be buckled one by one, which is beneficial to the quick positioning of the contact piece assembly 4 in the inner cavity 3 and improves the assembly accuracy.

[0040] As Figure 1 and Figure 7 shown, as a further explanation of the contact piece assembly 4, the contact piece assembly 4 at least includes a protection contact piece 4.1. The protection contact piece 4.1 is set to act and disengage from the electrical engagement position under an overload state, and the reset member 5 moves in the movable channel 1.1 in response to the overload action of the protection contact piece 4.1. Under normal conditions, the protection contact piece 4.1 of the contact piece assembly 4 is in the electrical engagement position. The protection contact piece 4.1 jumps suddenly and disconnects the electrical connection under an overload state. Under the overload action of the protection contact piece 4.1, the reset member 5 abuts against the acting part of the protection contact piece 4.1. At this time, the protection contact piece 4.1 can be abutted back to the electrical engagement position by pressing the reset member 5.

[0041] Specifically, a contact portion 5.2 is provided at the bottom of the reset member 5. The contact portion 5.2 extends into the inner cavity 3. Preferably, the overload switch is installed with the reset member 5 facing upward. The contact portion 5.2 abuts against the protection contact piece 4.1 both in the overload position and the electrical engagement position to ensure the position stability inside the overload switch.

[0042] When the overload switch is installed with the reset member 5 in the upward position, the spring 6 is set in a free state between the snap-fitting portion 5.1 and the end of the movable channel 1.1, and an overload stroke is defined within the movable channel 1.1. This overload stroke refers to the clearance between the spring 6 and the top of the movable channel 1.1. The overload stroke corresponds to the overload action amount of the protection contact piece 4.1. That is, after the protection contact piece 4.1 performs an overload action, the reset member 5 and the spring 6 thereon are actuated to displace by the corresponding overload stroke. At this time, the spring 6 abuts against the limiting portion 1.4, and the buckling portion 1.3 is spaced from the snap-fitting portion 5.1 to allow the reset member 5 to perform a pressing reset action.

[0043] In some other embodiments, if the overload switch is installed with the reset member 5 in the downward position, in the electrically engaged state, the action end of the protection contact piece 4.1 abuts against the reset member 5 through an overload action, and the reset member 5 is pressed through the overload stroke, thereby abutting the protection contact piece 4.1 to the electrically engaged position. At this time, the buckling portion 1.3 abuts against the snap-fitting portion 5.1.

[0044] As Figure 5 and Figure 6 shown, as a further embodiment of the contact piece assembly 4, the protection contact piece 4.1 refers to a bimetal sheet. The contact piece assembly 4 further includes a first contact piece 4.2 connected to the bimetal sheet, and a second contact piece 4.3 for lapping with the bimetal sheet.

[0045] Specifically, the bottom cover 2 is provided with a positioning hole 2.2, and the contact piece assembly 4 is provided with a connecting leg 4.4 extending out of the positioning hole 2.2. The contact piece assembly 4 is inserted and positioned through the connecting leg 4.4 and the positioning hole 2.2, and the connecting leg 4.4 extends out of the bottom cover 2 and the upper shell 1. During the assembly process, the contact piece assembly 4 and the bottom cover 2 are placed into the inner cavity 3 and the installation opening 1.2 together.

[0046] Specifically, the upper shell 1 is provided with a positioning table 1.6 corresponding to the end of the contact piece assembly 4. The contact piece assembly 4 is positioned between the positioning table 1.6 and the bottom cover 2. Both the first contact piece 4.2 and the second contact piece 4.3 have positioning legs 4.5 extending towards the boundary of the inner cavity 3. The positioning table 1.6 specifically refers to a positioning groove provided corresponding to the positioning legs 4.5. In the assembled state, the positioning legs 4.5 are abutted between the positioning table 1.6 and the bottom cover 2. Through the above improvements, the position stability of the contact piece assembly 4 in the assembled state is ensured to reduce the positioning difficulty during the assembly process.

[0047] In some other embodiments, the positioning table 1.6 also supports the protection contact piece 4.1.

[0048] Specifically, the upper shell 1 and the bottom cover 2 are coplanar and together define the bottom plane of the overload switch. The circumferential side of the bottom cover 2 is provided with buckle feet placed into the inner cavity 3, and the upper shell 1 is provided with buckle grooves 1.7 corresponding to the buckle feet.

[0049] This specific embodiment is only an interpretation of the present utility model, and it is not a limitation to the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment that do not contribute creatively as needed, but as long as it is within the scope of the claims of the present utility model, it is protected by the patent law.

Claims

1. An overload switch with simple assembly, characterized in that: include: An upper shell (1) and a bottom cover (2) which are interlocked and form an inner cavity (3), and a contact assembly (4) and a reset member (5) arranged in the inner cavity (3), wherein a movable channel (1.1) for accommodating the reset member (5) is integrally formed in the upper shell (1), and the upper shell (1) defines a mounting opening (1.2) of the inner cavity (3) in the direction of the movable channel (1.1), and the reset member (5), the contact assembly (4) and the bottom cover (2) are arranged to be placed in the inner cavity (3) along the mounting opening (1.2); The entrance of the movable channel (1.1) is provided with a buckling portion (1.3), the reset member (5) is provided with a buckling matching portion (5.1), the buckling matching portion (5.1) is buckled into the movable channel (1.1) through the buckling portion (1.3), the reset member (5) is limited to move in the movable channel (1.1), and is at least abutted against the contact piece assembly (4) in an overload state.

2. The overload switch with simple assembly according to claim 1, characterized in that: A limiting portion (1.4) is provided on the top of the movable channel (1.1), the mounting opening (1.2) and the movable channel (1.1) correspond to two ends of the upper shell (1), and the reset member (5) is constrained between the limiting portion (1.4) and the buckling portion (1.3).

3. The overload switch with simple assembly according to claim 1, characterized in that: The contact assembly (4) comprises at least a protective contact (4.1), wherein the protective contact (4.1) is configured to actuate and disengage from an electrical engagement position in an overload state, and the reset element (5) moves in the active channel (1.1) in response to the overload action of the protective contact (4.1).

4. The overload switch with simple assembly according to claim 3, characterized in that: The bottom of the reset member (5) is provided with an abutment portion (5.2), and the abutment portion (5.2) abuts against the protective contact sheet (4.1) in both the overload position and the electrical connection position.

5. The overload switch with simple assembly according to claim 3, characterized in that: The protective contact (4.1) is a bimetallic sheet, and the contact assembly (4) further comprises a first contact (4.2) connected to the bimetallic sheet, and a second contact (4.3) for overlapping the bimetallic sheet.

6. The overload switch with simple assembly according to claim 3, characterized in that: The reset member (5) is also sleeved with a spring (6), which is arranged in a free state between the snap-fitting portion (5.1) and the end of the movable channel (1.1), and an overload stroke is spaced out in the movable channel (1.1), and the overload stroke corresponds to the overload action amount of the protective contact piece (4.1).

7. The overload switch with simple assembly according to claim 1, characterized in that: The buckle connection portion (1.3) is provided with a first guiding inclined surface (1.5) facing the installation opening (1.2), and / or the buckle connection matching portion (5.1) is provided with a second guiding inclined surface (5.3) facing the buckle connection portion (1.3).

8. The overload switch with simple assembly according to claim 1, characterized in that: A positioning platform (1.6) corresponding to the end of the contact sheet assembly (4) is provided in the upper shell (1), and the contact sheet assembly (4) is positioned between the positioning platform (1.6) and the bottom cover (2).

9. The overload switch with simple assembly according to claim 1, characterized in that: The bottom cover (2) is provided with a positioning hole (2.2), the contact assembly (4) is provided with a connecting leg (4.4) extending from the positioning hole (2.2), the contact assembly (4) is plugged into the positioning hole (2.2) through the connecting leg (4.4), and is positioned and inserted into the inner cavity (3) and the installation opening (1.2) together with the bottom cover (2).

10. The overload switch with simple assembly according to claim 1, characterized in that: The upper shell (1) and the bottom cover (2) are coplanar and together define a bottom plane of the overload switch.

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