Overload protection switch

Abstract

The utility model discloses an overload protection switch, which comprises an elastic button arranged between a base and an upper cover in a reciprocating manner, one end of the base extends along the moving direction of the elastic button to form an arc-shaped first connecting part, and one end of the upper cover correspondingly forms a second connecting part extending in the same direction as the first connecting part. The cross section of the first connecting part and the cross section of the second connecting part are in a semi-arc shape, and the first connecting part and the second connecting part are oppositely combined to form a threaded connector allowing the elastic button to penetrate through when the base and the upper cover are installed and fixed. By adopting the technical scheme, the screwed joint is divided into the two connecting parts which are integrally formed on the base and the upper cover, and the screwed joint, the base and the upper cover are synchronously mounted, so that the whole structure is simple, the mounting process is simplified, the mounting is more convenient, the mounting efficiency is improved, the requirement of large-batch automatic production of the product is met, materials are saved, and the production cost is reduced. The production cost is reduced, and the market competitiveness is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power supply protectors, in particular to an overload protection switch. Background Art

[0002] With the continuous development of society, people's quality of life is constantly improving, and various electrical equipment appear in life. With the continuous aging of the circuits of household appliances, safety accidents such as circuit overload or short circuit are prone to occur. Usually, an overload protector is added to the circuit to improve the safety of electrical equipment, that is, the line electricity use. The overload protector usually uses a thermal bimetallic strip as an actuating element. When the overload current in the line exceeds the set value, the thermal bimetallic strip will heat up, deform and bend due to the overload current and automatically disconnect the switch, which protects the line and electrical appliances and improves the safety of electricity use.

[0003] For example, Chinese patent document CN218548271U discloses an overload protector, including a button assembly and a conductive mechanism arranged on a shell, the conductive mechanism including a bimetallic strip, a moving terminal and a static terminal, the bimetallic strip and the moving terminal are fastened together by riveting, and are closed by contacting the static terminal through a moving contact, the shell includes a main body and a cover plate fixedly connected by rivet one, the moving terminal and the static terminal are respectively fixed to the main body by rivet two, the button assembly includes a reset button arranged on the shell, and a fastening nut arranged between the reset button and the shell, the reset button extends into the shell through the fastening nut, and a compression spring is arranged on one end of the reset button.

[0004] It can be seen from the structure of the above-mentioned overload protector that it still has the following problems: 1. During installation, the reset button needs to be inserted into the fastening nut first, and then the fastening nut and the reset button need to be installed into the main body. Correspondingly, an installation groove for positioning the fastening nut needs to be opened on the main body, and finally the main body and the cover plate are fixedly connected. The installation process of the fastening nut and the reset button is complicated, the installation is relatively cumbersome, and the installation efficiency is low, which is not conducive to the mass automated production requirements of the product and increases the production cost; 2. The main body is fixed to the cover plate and the terminal respectively by rivets. The entire riveting process is complicated, and the dynamic and static terminals lack reliable positioning and are easy to shake. The consistency of the products installed in this way is relatively poor, which affects the overall quality and working performance of the product. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the problems in the prior art that the installation process of the fastening nut and the reset button is complicated, the installation efficiency is low, it is not conducive to the mass automated production requirements of the product, and the production cost is increased.

[0006] The utility model provides an overload protection switch, comprising a base, an upper cover and an elastic button which can be reciprocated and arranged between the base and the upper cover, wherein the base and the upper cover are fixedly connected by a fixing structure, one end of the base is extended along the moving direction of the elastic button to form a first arc-shaped connecting portion, one end of the upper cover is correspondingly formed with a second connecting portion extending in the same direction as the first connecting portion, the cross-sectional shape of the first connecting portion and the second connecting portion is semicircular, and threaded structures are respectively provided on the outer walls of the two, and the first connecting portion and the second connecting portion are matched when the base and the upper cover are fixed to form a threaded joint through which the elastic button can pass.

[0007] In an optional embodiment, a first conductive plate and a second conductive plate are arranged between the base and the upper cover, and the first conductive plate and the second conductive plate are respectively installed between the base and the upper cover through a positioning structure, and the positioning structure includes: two positioning grooves arranged on the base and suitable for installing the first conductive plate and the second conductive plate, and two positioning columns arranged in the two positioning grooves, and positioning holes respectively arranged on the first conductive plate and the second conductive plate and suitable for the positioning columns to pass through.

[0008] In an optional embodiment, the positioning structure also includes: a positioning hook arranged on the base and cooperating with one end of the second conductive plate, and at least one positioning boss arranged on the inner surface of the upper cover and located above the first conductive plate. When the upper cover is installed on the base, the positioning boss is driven to press against the fixed end of the first conductive plate or the bimetallic strip.

[0009] In an optional embodiment, a bimetallic strip connected to the second conductive plate is fixedly provided on the first conductive plate, the bimetallic strip is provided with a moving contact, a corresponding static contact is provided on the second conductive plate, and the elastic button has an isolating strip extending between the bimetallic strip and the second conductive plate. When the bimetallic strip is heated and bends toward the first conductive plate, the elastic button drives the isolating strip to block between the moving and static contacts.

[0010] In an optional embodiment, a guide slot extending along the moving direction of the elastic button is provided between the base and the upper cover, the guide slot includes a circular slide hole extending between the first connecting part and the second connecting part, and the first conductive plate and the second conductive plate are respectively provided on both sides of the guide slot.

[0011] In an optional embodiment, the elastic button includes a button rod movably set in the guide slot, and a button spring arranged between the button rod and the guide slot; one end of the button rod passes through the circular sliding hole and extends out of the threaded joint, and the other end thereof is provided with a positioning recessed hole extending along the length direction of the button rod, one end of the button spring is arranged in the positioning recessed hole, and the other end thereof extends and abuts against an inner wall of one end of the guide slot.

[0012] In an optional embodiment, the button rod includes a round rod portion inserted into the circular sliding hole, a square rod portion connected to the round rod portion, and an isolation plate extending from the side of the square rod portion toward the second conductive plate, a first limiting boss is provided at the bottom of the square rod portion, a second limiting boss opposite to the first limiting boss is provided between the guide slot and the circular sliding hole, and the positioning recessed hole is provided on one end of the square rod portion away from the round rod portion.

[0013] In an optional embodiment, the fixing structure includes a plurality of fixing shafts arranged on one of the base or the upper cover, and a plurality of fixing holes correspondingly arranged on the other of the base or the upper cover and cooperating with the plurality of fixing shafts. The fixing shafts pass through the fixing holes and are fixedly connected by a hot riveting structure.

[0014] In an optional embodiment, the fixing structure includes a snap-fit ​​structure arranged between the base and the upper cover, the snap-fit ​​structure includes a plurality of snap-fit ​​bosses arranged on the side walls of the base and / or the upper cover, and a plurality of elastic snap plates correspondingly arranged on the side walls of the base and / or the upper cover and forming a snap-fit ​​with the plurality of snap-fit ​​bosses, the elastic snap plates being provided with snap-fit ​​grooves that are snap-fitted to the snap-fit ​​bosses.

[0015] In an optional embodiment, the connection edge between the base and the upper cover is maintained in a sealed and fixed connection by ultrasonic welding.

[0016] Compared with the prior art, the technical solution of the utility model has the following advantages:

[0017] 1. The utility model provides an overload protection switch, in which a first connection part and a second connection part extending in the moving direction of the elastic button are respectively formed at one end of the base and the upper cover, and the cross-sectional shapes of the two connection parts are respectively semicircular arc shapes. During installation, the elastic button is first placed on the base, and then the base and the upper cover are fixedly assembled together to drive the first connection part and the second connection part to mate to form an integral threaded joint, and at the same time, the elastic button is inserted into the assembled threaded joint. The advantage of adopting this technical solution is that the threaded joint is divided into two connection parts, which are integrally formed on the base and the upper cover, and are synchronously installed with the base and the upper cover. The overall structure is simple, the installation process is simplified, the installation is more convenient, the installation efficiency is improved, and it is suitable for the mass automated production requirements of this product. At the same time, it also saves materials, reduces production costs, and enhances market competitiveness.

[0018] 2. The utility model provides an overload protection switch, in which the first conductive plate and the second conductive plate are respectively positioned and installed in the two positioning grooves of the base through the cooperation of the positioning column and the positioning hole, and then the positioning hook is clamped on one end of the second conductive plate, thereby playing a multi-point positioning role for the second conductive plate, and the upper cover is pressed on the first conductive plate through the positioning boss during installation, which also plays a multi-point positioning role for the first conductive plate, thereby preventing the first conductive plate and the second conductive plate from being displaced and shaken during the installation process, and playing a positioning and installation role for the two conductive plates between the base and the cover plate. The entire installation process does not require the use of fasteners such as rivets, the installation structure is simple, and the installation positioning is more accurate, which is conducive to improving the installation efficiency. The installed products have better consistency, and the product quality and working performance are improved.

[0019] 3. The utility model provides an overload protection switch, in which an elastic button is mainly composed of a button rod and a button spring, one end of the button rod extends out of the threaded joint, and the other end is provided with a positioning recessed hole extending along its length direction, one end of the button spring is set in the positioning recessed hole, so that one end of it extends and abuts against the inner wall of one end of the guide slide groove, and the button spring is positioned and connected through the positioning recessed hole to ensure the stability of the installation position of the button spring, when the bimetallic strip is bent by heat, the button rod drives the isolation sheet to move and be inserted between the moving and static contacts under the action of the elastic force of the button spring, thereby insulating and isolating the moving and static contacts to play an overload protection role.

[0020] 4. The utility model provides an overload protection switch, in which the base and the upper cover are first positioned and connected by the cooperation of the fixed shaft and the fixed hole, and then the fixed shaft is melted and filled in the hole by hot riveting, so that the base and the upper cover are firmly connected during the cooling process; obviously, the base and the upper cover can also be installed and fixed by a snap-fit ​​structure, or fixedly connected by ultrasonic welding. It can be seen that the base and the upper cover using this technical solution have a variety of installation methods, and the installation structure is simple. The entire installation process does not require rivets, screws and other fasteners, which is conducive to improving installation efficiency. Users can choose the corresponding installation method according to actual needs, which is suitable for automatic assembly of products. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A three-dimensional structural diagram of the overload protection switch provided by the utility model;

[0023] Figure 2 It is a cross-sectional structural diagram of the overload protection switch of the utility model;

[0024] Figure 3 This is a schematic diagram of the internal structure of the overload protection switch of the utility model;

[0025] Figure 4 It is a structural schematic diagram of the base of the utility model;

[0026] Figure 5 It is a structural schematic diagram of the upper cover of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the button rod of the utility model.

[0028] Description of the drawings: 1. Base; 11. First connecting part; 12. Positioning column; 13. Positioning hook; 14. Second limiting boss; 2. Upper cover; 21. Second connecting part; 22. Positioning boss; 3. Elastic button; 30. Isolation plate; 31. Button rod; 331. Round rod; 332. Square rod; 32. Button spring; 33. Positioning recess; 34. First limiting boss; 4. Threaded joint; 5. First conductive plate; 6. Second conductive plate; 61. Static contact; 7. Bimetallic strip; 71. Moving contact; 8. Guide slide groove; 81. Circular slide hole; 91. Fixed shaft; 92. Fixed hole; 93. Buckle boss; 94. Elastic buckle plate. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0030] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" 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, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0031] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0032] Example

[0033] The utility model provides Figure 1-6 An overload protection switch shown in the figure comprises a base 1, an upper cover 2 and an elastic button 3 which can be reciprocated and arranged between the base 1 and the upper cover 2. The base 1 and the upper cover 2 are fixedly connected by a fixing structure. One end of the base 1 is formed with an arc-shaped first connecting portion 11 extending along the moving direction of the elastic button 3, and one end of the upper cover 2 is correspondingly formed with a second connecting portion 21 extending in the same direction as the first connecting portion 11. The cross-sectional shape of the first connecting portion 11 and the second connecting portion 21 is semicircular, and a threaded structure is respectively provided on the outer walls of the first connecting portion 11 and the second connecting portion 21. When the base 1 and the upper cover 2 are fixed, the first connecting portion 11 and the second connecting portion 21 are matched to form a threaded joint 4 for the elastic button 3 to pass through. This overload protection switch can be detachably installed to a preset installation position by a threaded connection method of the threaded joint 4, and both installation and disassembly are relatively convenient.

[0034] In the above embodiment, a first connection portion 11 and a second connection portion 21 extending along the moving direction of the elastic button 3 are respectively formed at one end of the base 1 and the upper cover 2, and the cross-sectional shapes of the two connection portions are respectively semicircular arcs. During installation, the elastic button 3 is first placed on the base 1, and then the base 1 and the upper cover 2 are fixedly assembled together to drive the first connection portion 11 and the second connection portion 21 to mate to form an integral threaded joint 4, and at the same time, the elastic button 3 is inserted into the assembled threaded joint 4. The advantage of adopting this technical solution is that the threaded joint 4 is divided into two connection portions and integrally formed on the base 1 and the upper cover 2, and is synchronously installed with the base and the upper cover. The overall structure is simple, the installation process is simplified, the installation is more convenient, the installation efficiency is improved, and it is suitable for the mass automated production requirements of this product. At the same time, it also saves materials, facilitates inventory management and production management, reduces production costs, and enhances market competitiveness.

[0035] Further preferably, Figure 1-3As shown, a first conductive plate 5 and a second conductive plate 6 are arranged between the base 1 and the upper cover 2, a bimetallic strip 7 connected to the second conductive plate 6 is fixedly arranged on the first conductive plate 5, the bimetallic strip 7 has a fixed end fixedly connected to the first conductive plate 5, and a free end extending to the second conductive plate 6, the free end bends toward the back of the second conductive plate 6 when the bimetallic strip 7 is overloaded and heated, wherein one end of the first conductive plate 5 and the second conductive plate 6 are accommodated between the base and the upper cover, and the other ends of the first conductive plate 5 and the second conductive plate 6 are respectively extended out of the base and the upper cover, and the first conductive plate 5 and the second conductive plate 6 are respectively installed between the base 1 and the upper cover 2 through a positioning structure, and the positioning structure includes: a fixed end arranged at the bottom The base 1 includes two positioning grooves suitable for installing the first conductive plate 5 and the second conductive plate 6, two positioning columns 12 arranged in the two positioning grooves, and positioning holes respectively arranged on the first conductive plate 5 and the second conductive plate 6 and suitable for the positioning columns 12 to pass through. In addition, it also includes a positioning hook 13 arranged on the base 1 and cooperating with the second conductive plate 6 to be clamped at one end, and at least one positioning boss 22 arranged on the inner surface of the upper cover 2 and located above the first conductive plate 5. When the upper cover 2 is installed on the base 1, the positioning boss 22 is driven to press against the first conductive plate 5, or the positioning boss 22 is pressed against the fixed end of the bimetallic strip 7, which can also play a role in positioning and installing the first conductive plate.

[0036] The advantage of adopting the above-mentioned positioning structure is that the first conductive plate 5 and the second conductive plate 6 are pre-positioned and installed in the two positioning grooves of the base 1 respectively through the cooperation of the positioning column 12 and the positioning hole, and then the positioning hook 13 is clamped on one end of the second conductive plate 6, so as to play a multi-point positioning role for the second conductive plate 6, and the upper cover 2 is pressed on the first conductive plate 5 through the positioning boss 22 during installation, which also plays a multi-point positioning role for the first conductive plate, thereby preventing the first conductive plate 5 and the second conductive plate 6 from displacement and shaking during the installation process, and playing a positioning and installation role for the two conductive plates between the base and the cover plate. The entire installation process does not require the use of fasteners such as rivets, the installation structure is simple, and the installation positioning is more accurate, which is conducive to improving the installation efficiency. In this way, the installed products have better consistency, and the product quality and working performance are improved.

[0037] like Figure 2-3As shown, a moving contact 71 is provided on the free end of the bimetallic strip 7, and a static contact 61 is correspondingly provided on the second conductive plate 6. The elastic button 3 has an isolating sheet 30 extending between the bimetallic strip 7 and the second conductive plate 6. When the overload protection is working normally, since the moving contact 71 and the static contact 61 are in closed contact, the isolating sheet 30 is blocked and located outside the moving contact and the static contact. Therefore, when the bimetallic strip 7 is heated and bent back to the first conductive plate 5, the elastic button 3 drives the isolating sheet 30 to block between the moving and static contacts. In this way, the moving and static contacts are insulated and separated to prevent the moving and static contacts from contacting again when the line fault is not cleared. Only after the elastic button 3 drives the isolating sheet 30 to reset, can the moving and static contacts be closed again.

[0038] Combine the following Figure 2 and Figure 6 The specific structure of the elastic button is described in detail:

[0039] A guide slot 8 extending along the moving direction of the elastic button 3 is provided between the base 1 and the upper cover 2, and the guide slot 8 includes a circular slide hole 81 extending between the first connecting portion 11 and the second connecting portion 21, and the first conductive plate 5 and the second conductive plate 6 are respectively arranged on both sides of the guide slot 8, wherein the elastic button 3 includes a button rod 31 movably arranged in the guide slot 8, and a button spring 32 arranged between the button rod 31 and the guide slot 8; one end of the button rod 31 passes through the circular slide hole 81 and extends out of the threaded joint 4, and the other end thereof is provided with a positioning recessed hole 33 extending along the length direction of the button rod 31, one end of the button spring 32 is arranged in the positioning recessed hole 33, and the other end thereof extends and abuts against an inner wall of one end of the guide slot 8. This structural setting plays a positioning and connecting role for the button spring 32 through the positioning recessed hole 33, thereby ensuring the stability of the installation position of the button spring 32. When the bimetallic strip 7 is bent by heat, the button rod 31 drives the isolation strip 30 to move and be inserted between the moving and static contacts under the elastic force of the button spring 32, thereby insulating and isolating the moving and static contacts to play an overload protection role.

[0040] As a specific structural setting, the button rod 31 includes a round rod portion 331 inserted into the circular sliding hole, a square rod portion 332 connected to the round rod portion 331, and an isolation sheet 30 extending from the side of the square rod portion 332 to the side of the second conductive plate 6. A first limiting boss 34 is provided at the bottom of the square rod portion 332, and a second limiting boss 14 opposite to the first limiting boss 34 is provided between the guide slide groove 8 and the circular sliding hole 81. The positioning recessed hole 33 is provided on one end of the square rod portion 332 away from the round rod portion 331. This structural setting, through the limiting cooperation formed by the first limiting step and the second limiting step, is used to limit the distance that the button rod 31 slides along the guide slide groove under the action of the button spring 32.

[0041] The following combination Figure 3-5 The specific installation method of the base and the upper cover is described in detail:

[0042] The base 1 and the upper cover 2 are fixedly connected by a fixing structure. Obviously, there are many ways to set the fixing structure, and the following ways are given as examples:

[0043] The fixing structure preferably adopts a hot riveting structure, specifically, the fixing structure includes a plurality of fixing shafts 91 arranged on one of the base 1 or the upper cover 2, and a plurality of fixing holes 92 correspondingly arranged on the other of the base 1 or the upper cover 2 and cooperating with the plurality of fixing shafts 91. The fixing shafts 91 pass through the fixing holes 92 and are fixedly connected by a hot riveting structure. The fixing shafts 91 and the base 1 or the upper cover 2 are formed as an integral structure. In this structural setting, the base 1 and the upper cover 2 are first positioned and connected by cooperating with the fixing shafts 91 and the fixing holes 92, and then the fixing shafts are melted and the holes are filled by hot riveting. During the cooling process, the base 1 and the upper cover 2 are firmly connected, thereby realizing a fixed connection between the base and the upper cover.

[0044] As a first alternative, the fixing structure can be in the form of a snap-on structure, specifically, the fixing structure includes a snap-on structure arranged between the base 1 and the upper cover 2, and the snap-on structure includes: a plurality of snap-on bosses 93 arranged on the side walls of the base 1 and / or the upper cover 2, and a plurality of elastic buckle plates 94 correspondingly arranged on the side walls of the base 1 and / or the upper cover 2 and forming a snap-on fit with the plurality of snap-on bosses 93, the elastic buckle plates 94 are provided with snap-on grooves snap-on to the snap-on bosses 93, it can be seen that the snap-on bosses 93 and the elastic buckle plates 94 can be arranged on the base 1 and the upper cover 2 respectively, such an installation arrangement can also realize a fixed connection between the base 1 and the upper cover 2, and the entire installation process does not require the use of fasteners such as rivets and screws, which is conducive to improving the installation efficiency. Of course, the hot riveting structure and the snap-on structure can also be used together.

[0045] As a second alternative, the fixing structure can also be welded by ultrasonic welding, specifically, the connection edge between the base 1 and the upper cover 2 is sealed and fixed by ultrasonic welding, and the fixed connection between the base 1 and the upper cover 2 can also be achieved. It can be seen that the base and the upper cover using this technical solution have a variety of installation methods, the installation structure is simple, and the user can choose the corresponding installation method according to actual needs, which is suitable for the automatic assembly of the product. Those skilled in the art can make a choice of the specific setting method of the fixing structure according to the above description, and other equivalent implementations will not be described one by one here.

[0046] Although the embodiments of the present invention are described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. An overload protection switch, comprising a base (1), an upper cover (2), and an elastic button (3) reciprocatably arranged between the base (1) and the upper cover (2), wherein the base (1) and the upper cover (2) are fixedly connected by a fixing structure, and characterized in that: One end of the base (1) is formed with a first arc-shaped connecting portion (11) extending in the moving direction of the elastic button (3), and one end of the upper cover (2) is correspondingly formed with a second connecting portion (21) extending in the same direction as the first connecting portion (11). The cross-sectional shapes of the first connecting portion (11) and the second connecting portion (21) are semi-circular arc-shaped, and thread structures are respectively provided on the outer walls of the first connecting portion (11) and the second connecting portion (21). When the base and the upper cover are fixed, the first connecting portion (11) and the second connecting portion (21) are matched to form a threaded joint (4) through which the elastic button (3) can pass.

2. An overload protection switch according to claim 1, characterized in that: A first conductive plate (5) and a second conductive plate (6) are arranged between the base (1) and the upper cover (2); a bimetallic strip (7) connected to the second conductive plate (6) is fixedly arranged on the first conductive plate (5); the first conductive plate (5) and the second conductive plate (6) are respectively installed between the base (1) and the upper cover (2) via a positioning structure; the positioning structure comprises: two positioning grooves arranged on the base (1) and suitable for installing the first conductive plate (5) and the second conductive plate (6); two positioning columns (12) arranged in the two positioning grooves; and positioning holes respectively arranged on the first conductive plate (5) and the second conductive plate (6) and suitable for the positioning columns (12) to pass through.

3. An overload protection switch according to claim 2, characterized in that: The positioning structure also includes: a positioning hook (13) arranged on the base (1) and cooperating with one end of the second conductive plate (6), and at least one positioning boss (22) arranged on the inner surface of the upper cover (2) and located above the first conductive plate (5); when the upper cover (2) is installed on the base (1), the positioning boss (22) is driven to press against the fixed end of the first conductive plate (5) or the bimetallic strip (7).

4. An overload protection switch according to claim 3, characterized in that: A moving contact (71) is provided on the free end of the bimetallic strip (7), and a stationary contact (61) is correspondingly provided on the second conductive plate (6). The elastic button (3) has an isolating plate (30) extending between the bimetallic strip (7) and the second conductive plate (6). When the bimetallic strip (7) is heated and bends away from the first conductive plate (5), the elastic button (3) drives the isolating plate (30) to be blocked between the moving and stationary contacts (61).

5. An overload protection switch according to claim 4, characterized in that: A guide slot (8) extending along the moving direction of the elastic button (3) is provided between the base (1) and the upper cover (2); the guide slot (8) comprises a circular slide hole (81) extending between the first connecting portion (11) and the second connecting portion (21); the first conductive plate (5) and the second conductive plate (6) are respectively provided on both sides of the guide slot (8).

6. An overload protection switch according to any one of claims 1 to 5, characterized in that: The elastic button (3) comprises a button rod (31) movably arranged in the guide slot (8), and a button spring (32) arranged between the button rod (31) and the guide slot (8); one end of the button rod (31) passes through the circular sliding hole (81) and extends out of the threaded joint (4), and the other end of the button rod (31) is provided with a positioning recessed hole (33) extending along the length direction of the button rod (31); one end of the button spring (32) is arranged in the positioning recessed hole (33), and the other end of the button spring (32) extends and abuts against the inner wall of one end of the guide slot (8).

7. An overload protection switch according to claim 6, characterized in that: The button rod (31) comprises a round rod portion (331) inserted into the round sliding hole, a square rod portion (332) connected to the round rod portion (331), and an isolation sheet (30) extending from the side of the square rod portion (332) toward the second conductive plate (6), a first limiting boss (34) is provided at the bottom of the square rod portion (332), a second limiting boss (14) opposite to the first limiting boss (34) is provided between the guide slide groove (8) and the round sliding hole (81), and the positioning recessed hole (33) is provided at one end of the square rod portion (332) away from the round rod portion (331).

8. The overload protection switch according to claim 1, characterized in that: The fixing structure comprises a plurality of fixing shafts (91) arranged on one of the base (1) or the upper cover (2), and a plurality of fixing holes (92) correspondingly arranged on the other of the base (1) or the upper cover (2) and cooperating with the plurality of fixing shafts (91); the fixing shafts (91) are fixedly connected by a heat riveting structure after passing through the fixing holes (92).

9. The overload protection switch according to claim 1, characterized in that: The fixing structure comprises a snap-fit ​​structure arranged between the base (1) and the upper cover (2), the snap-fit ​​structure comprising: a plurality of snap-fit ​​bosses (93) arranged on the side walls of the base (1) and / or the upper cover (2), and a plurality of elastic snap plates (94) correspondingly arranged on the side walls of the base (1) and / or the upper cover (2) and forming a snap-fitting fit with the plurality of snap-fit ​​bosses (93), wherein the elastic snap plates (94) are provided with snap-fitting grooves snap-fitted to the snap-fit ​​bosses (93).

10. The overload protection switch according to claim 1, characterized in that: The connection edge between the base (1) and the upper cover (2) is maintained in a sealed and fixed connection by ultrasonic welding.

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