Push type overload switch

Abstract

The utility model provides a push type overload switch, which comprises a shell, a push assembly, a terminal assembly and a double-elastic-sheet assembly, an installation cavity is arranged in the shell, and the push assembly is arranged at the top of the installation cavity and partially extends into the installation cavity. The terminal assembly is located at the bottom end of the shell and comprises a first terminal and a second terminal which are arranged in the width direction, one end of the first terminal and one end of the second terminal are fixed in the installation cavity and penetrate out of the bottom of the shell, and the first terminal is provided with a lower contact head right facing the pressing assembly. One end of the first elastic piece is fixed on the inner wall of the mounting cavity close to the first terminal side, one end of the second elastic piece is electrically connected with the second terminal and fixed at the penetrating-out end of the pressing assembly, and the inner wall of the other side of the mounting cavity is provided with a first abutting table for supporting the second elastic piece. By arranging the first abutting table, the surface of the second elastic sheet is prevented from directly contacting the surface of the second terminal, the heating surface of the terminal is prevented from being reduced, the tripping stability of the double-elastic-sheet assembly is ensured, and the product performance is improved.

Description

Technical Field

[0001] This utility model relates to the field of overload switch technology, specifically to a push-button type overload switch. Background Technology

[0002] An overload protection switch is a device used to protect electrical equipment from overload damage. It usually contains a bimetallic strip. When an overload occurs in the circuit, that is, when the current exceeds the rated value, the bimetallic strip will heat up due to the heat generated by the current. Since the bimetallic strip is made of two metals with different coefficients of thermal expansion bonded together, it will bend and deform after being heated. When the deformation reaches a certain degree, it will cause the switch contacts to open, thereby cutting off the circuit and playing the role of overload protection.

[0003] See Figure 1 , Figure 1 In the existing push-button overload protection switch, the lower metal piece 01 is supported by the fulcrum 021 at the bend of the terminal 02. However, when an overload occurs, the upper metal piece 03 and the lower metal piece 01 are squeezed together, making it easy for the lower metal piece to make contact with the terminal 02 and conduct. This reduces the heating surface of the lower metal piece 01, affects the stability of the bimetallic strip tripping, and thus leads to poor product stability. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a push-button type overload switch, comprising:

[0005] The outer casing includes a housing and a cover, the housing having an internal mounting cavity with an opening on one side, and the cover covering the opening;

[0006] The pressing component has one end located inside the mounting cavity and the other end protruding from the top of the housing to the outside of the outer shell;

[0007] A terminal assembly, located at the bottom of the housing, includes a first terminal and a second terminal arranged along the width of the housing. One end of each terminal is fixed within a mounting cavity, and the other end extends from the bottom of the housing to the outside. The first terminal has a lower contact head directly opposite the pressing assembly.

[0008] A double spring assembly includes a first spring and a second spring. One end of the first spring is installed on the inner wall of the mounting cavity near the first terminal. One end of the second spring is fixed to the second terminal and electrically connected to the second terminal. The other ends of the first spring and the second spring are interlocked. One end of the pressing component passes through the second spring and is fixed to the second spring.

[0009] The inner wall of the mounting cavity near the second terminal has a first abutment platform, which abuts against the second spring piece.

[0010] According to one embodiment of the present invention, the inner wall of the mounting cavity also has a right-angled platform, which is located below the first abutment platform and forms a first snap-fit ​​groove with the first abutment platform. One end of the second terminal is bent along the right-angled platform and snapped into the first snap-fit ​​groove. The width D1 of the right-angled platform is greater than the width D2 of the abutment platform.

[0011] According to one embodiment of the present invention, one side of the cover has a support platform. When the cover is closed, the support platform is located between the second spring sheet and the right-angle platform, and the thickness H1 of the support platform is greater than the thickness H2 of the second terminal.

[0012] According to one embodiment of the present invention, the mounting cavity also has a baffle. The baffle is located on the side of the right-angle platform facing the first terminal, and a fixed gap is formed between it and the right-angle platform. One end of the second terminal is located in the fixed gap, and the side of it facing the baffle has a first snap-fit ​​connector. One end of the second spring is also located in the fixed gap and has a first snap-fit ​​opening. The first snap-fit ​​connector snaps into the first snap-fit ​​opening and passes through the first snap-fit ​​opening to abut against the baffle.

[0013] According to one embodiment of the present invention, the cover is further provided with a second abutment platform, which is directly opposite the fixed gap. When the cover is closed, the second abutment platform is located within the fixed gap and abuts against one side of the second abutment platform and one side of the second terminal, respectively.

[0014] According to one embodiment of the present invention, the pressing assembly includes a pressing rod, an elastic element, and an upper contact head. An opening is provided at the center of the top of the outer shell. The pressing rod includes a rod body and a limiting head. One end of the rod body is located in the mounting cavity, and the other end extends out of the outer shell through the opening. The limiting head is located at the end of the rod body located in the mounting cavity. The elastic element is sleeved on the outside of the rod body, and its two ends abut against the limiting head and the top wall of the mounting cavity, respectively. The upper contact head is fixed to one end of the limiting head, and a second spring is engaged between the limiting head and the contact head.

[0015] According to one embodiment of the present invention, the second spring sheet also has a first through hole, which is directly opposite the opening. The upper contact head includes a first contact body and a first connecting head. The outer diameter of the first contact body is larger than the outer diameter of the connecting head. One end of the second spring sheet is located between the upper contact head and the limiting head. The first connecting head passes through the opening from the lower surface of the second spring sheet and is connected to the limiting head. The upper surface of the first contact body abuts against the second spring sheet.

[0016] According to one embodiment of the present invention, the first terminal has a bent section at one end located in the mounting cavity. The bent section bends toward the center of the bottom of the mounting cavity and has a second through hole directly opposite the upper contact head. The lower contact head includes a second contact body and a second connector. The outer diameter of the second contact body is also larger than the outer diameter of the second connector. The second contact body is located on the upper surface of the bent section of the first terminal. One end of the second connector is connected to the second contact body, and the other end passes through the second through hole and is connected to the bottom of the mounting cavity.

[0017] According to one embodiment of the present invention, the upper wall of the mounting cavity is further provided with two limiting blocks, which are respectively disposed above the first spring and the second spring, and located on the movement path of the first spring and the second spring.

[0018] According to one embodiment of the present invention, the double spring assembly further includes a connector, and an adjustment platform is provided in the mounting cavity. The adjustment platform is located on the side of the first spring facing away from the second spring. A screw hole connector is provided on the adjustment platform and screwed into the screw hole. The connector is provided with a groove. One end of the first spring has a V-shaped notch and the V-shaped notch is engaged in the groove.

[0019] The beneficial effects of this utility model are as follows: by setting a first abutting platform inside the mounting cavity to support the second spring, when the second spring expands due to overload and generates mechanical repulsion against the first spring, the second spring is supported by the first abutting platform, which can effectively prevent it from directly contacting the surface of the second terminal, thus reducing the heating surface of the second terminal and ensuring the stability of the double spring assembly, that is, improving the stability of the product. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0021] Figure 1 This is an overload switch in the existing technology;

[0022] Figure 2 This is a schematic diagram of the push-button overload switch structure in the embodiment;

[0023] Figure 3 This is a diagram showing the internal structure of the push-button overload switch in the embodiment;

[0024] Figure 4 Schematic diagram of the cover structure in the embodiment;

[0025] Figure 5 This is a longitudinal cross-sectional view of the push-button overload switch in the embodiment;

[0026] Figure 6 for Figure 5 Enlarged view of Part A;

[0027] Figure 7 This is a schematic diagram of the pressing component, terminal component, and double spring component in the embodiment. Detailed Implementation

[0028] The following drawings will disclose several embodiments of this utility model. For clarity, many practical details will be described in the following description. However, it should be understood that these practical details should not be used to limit this utility model. That is, in some embodiments of this utility model, these practical details are not essential. In addition, for the sake of simplicity, some conventional structures and components will be shown in the drawings in a simple schematic manner.

[0029] Furthermore, in this utility model, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the utility model. They are merely used to distinguish components or operations described with the same technical terms and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0030] See Figures 1-7 , Figure 1 For overload switches in existing technology, Figure 2 This is a schematic diagram of the push-button overload switch structure in the embodiment. Figure 3 This is a diagram showing the internal structure of the push-button overload switch in the embodiment. Figure 4 A schematic diagram of the cover structure in one embodiment. Figure 5 This is a longitudinal cross-sectional view of the push-button overload switch in the embodiment. Figure 6 for Figure 5 Enlarged view of Part A Figure 7This is a schematic diagram of the pressing assembly, terminal assembly, and double spring assembly in the embodiment. In this example, a pressing overload switch includes a housing 1, a pressing assembly 2, a terminal assembly 3, and a double spring assembly 4. It includes a housing 11 and a cover 12. The housing 11 has a mounting cavity 111 with an opening 112 on one side. The cover 12 covers the opening 112. One end of the pressing assembly 2 is located inside the mounting cavity 111, and the other end extends from the top of the housing 11 to the housing 1. The terminal assembly 3 is located at the bottom of the housing 11 and includes a first terminal 31 and a second terminal 32 arranged along the width direction of the housing. One end of each terminal 31 is fixed inside the mounting cavity 111, and the other end extends from the bottom of the housing 11 to the outside of the housing 1. The first terminal 31... The component 31 has a lower contact head 311, which is directly opposite the pressing assembly 2. The double spring assembly 4 includes a first spring 41 and a second spring 42. One end of the first spring 41 is mounted on the inner wall of the mounting cavity 111 near the first terminal 31. One end of the second spring 42 is fixed to and electrically connected to the second terminal 32. The other ends of the first spring 41 and the second spring 42 are interlocked. One end of the pressing assembly 2 passes through the second spring 42 and is fixed to it. The inner wall of the mounting cavity 111 near the second terminal 32 has a first abutment platform 1111, which abuts against the second spring 42. In this example, the first spring 41 is made of stainless steel, and the second spring 42 is a thermally expanding bimetallic spring in the prior art. In use, pressing down the pressing component 2 causes it to contact the lower contact head 311, enabling current conduction. During this process, the double spring assembly 4 bends downward to achieve balance, ensuring that the pressing component 2 remains connected to the lower contact head 311. Therefore, when the current is overloaded, the second spring 42 undergoes thermal expansion and generates a mechanical repulsive force against the first spring 41. When the opposing force exceeds the equilibrium value, the pressing component 2 jumps out to detach from the lower contact head 311. It can be understood that by providing a first abutment platform 1111 inside the mounting cavity 1 to support the second spring 42, when the first spring 41 and the second spring 42 are heated and squeezed against each other due to current overload, the second spring 42 is supported by the first abutment platform 1111, which effectively prevents it from directly contacting the surface of the second terminal 32, thus reducing the heating surface of the second terminal 42 and ensuring the stability of the double spring assembly 2's jump-out, thereby improving the product's stability.

[0031] Preferably, the inner wall of the mounting cavity 111 further has a right-angled platform 1112, which is located below the first abutment platform 1111 and forms a first locking groove 1113 between it and the first abutment platform 1111. One end of the second terminal 32 is bent along the right-angled platform 1112 and locked into the first locking groove 1113. The width D1 of the right-angled platform is greater than the width D2 of the abutment platform 1111. One side of the cover 12 has a support platform 121. When the cover 12 is closed, the support platform 121 is located between the second spring piece 42 and the right-angled platform 1112, and the thickness H1 of the support platform 121 is greater than the thickness H2 of the second terminal 32. In this way, the support platform 121 can prevent the bottom surface of the second spring piece 42 from contacting the bent surface of the second terminal 32. That is, the support platform 121 and the first abutment platform 1111 jointly support the second spring piece 42, further preventing the second spring piece 42 from contacting the surface of the second terminal 32.

[0032] Furthermore, the mounting cavity 111 also includes a baffle 1114. The baffle 1112 is located on the side of the right-angled platform 121 facing the first terminal 31, forming a fixed gap 11141 between it and the right-angled platform 1112. One end of the second terminal 32 is located within the fixed gap 11141, and its side facing the baffle 1112 has a first snap-fit ​​connector 321. One end of the second spring piece 42 is also located within the fixed gap 11141 and has a first snap-fit ​​opening 421. The first snap-fit ​​connector 321 snaps into the first snap-fit ​​opening 421 and passes through the first snap-fit ​​opening 421 to abut against the baffle 1112. It can be understood that by fixing the first snap-fit ​​connector 321 to the first snap-fit ​​opening 421, one end of the second spring piece 42 is fixed to the second spring piece 32, while simultaneously enabling the second spring piece 42 to conduct with the second terminal 32.

[0033] Furthermore, the cover 12 is also provided with a second abutment platform 122, which is directly opposite the fixed gap 11141. When the cover 12 is closed, the second abutment platform 122 is located within the fixed gap 11141 and abuts against one side of the second abutment platform 122 and one side of the second terminal 32, respectively. It can be understood that by the second abutment platform 122 abutting against one side of the second abutment platform 122 and one side of the second terminal 32, the second terminal 32 is prevented from shaking, thereby improving the stability of the second terminal.

[0034] Furthermore, the pressing assembly 2 includes a pressing rod 21, an elastic element 22, and an upper contact head 23. An opening 112 is provided at the center of the top of the outer shell 11. The pressing rod 21 includes a rod body 211 and a limiting head 212. One end of the rod body 211 is located inside the mounting cavity 111, and the other end extends out of the outer shell 1 through the opening 112. The limiting head 212 is located at the end of the rod body 211 located inside the mounting cavity 111. The elastic element 22 is sleeved on the outside of the rod body 211, and its two ends abut against the limiting head 212 and the top wall of the mounting cavity 111, respectively. The upper contact head 23 is fixed to one end of the limiting head 212, and the second spring piece 32 is engaged between the limiting head 212 and the contact head 23. In this example, the elastic element 22 is a spring. Since the two ends of the elastic element 22 abut against the limit head 212 and the top wall of the mounting cavity 111 respectively, it can not only ensure that the pressing rod 21 is stable and does not shake, but also ensure that the upper contact head 23 maintains contact and conduction with the lower contact head 23. When the double spring assembly 4 is overloaded and jumps out, the elastic element 22 contracts, causing the pressing rod 21 to jump out upward.

[0035] Specifically, the second spring 32 also has a first through hole 422, which is directly opposite the opening 112. The upper contact head 23 includes a first contact body 231 and a first connecting head 232. The outer diameter of the first contact body 231 is larger than the outer diameter of the connecting head 232. One end of the second spring 32 is located between the upper contact head 23 and the limiting head 212. The first connecting head 232 passes through the opening 112 from the lower surface of the second spring 32 and is connected to the limiting head 212. The upper surface of the first contact body 231 abuts against the second spring 32, thereby connecting the second spring 42 to the pressing component 2.

[0036] Similarly, the first terminal 31 has a bent section 312 at one end located in the mounting cavity 111. The bent section 312 bends toward the center of the bottom of the mounting cavity 111 and has a second through hole 3121 directly opposite the upper contact head 23. The lower contact head 311 includes a second contact body 3111 and a second connector 3112. The outer diameter of the second contact body 3111 is also larger than the outer diameter of the second connector 3112. The second contact body 3111 is located on the upper surface of the bent section 312 of the first terminal 31. One end of the second connector 3112 is connected to the second contact body 3111, and the other end passes through the second through hole 3121 and is connected to the bottom of the mounting cavity 111, so that the lower contact head 311 is fixed and conducts the first terminal 31.

[0037] Preferably, the upper wall of the mounting cavity 111 is further provided with two limiting blocks 1115, which are respectively disposed above the first spring piece 41 and the second spring piece 42, and located on the movement path of the first spring piece 41 and the second spring piece 42. It can be understood that when the first spring piece 41 and the second spring piece 42 spring up, the two limiting blocks 1115 respectively hold the first spring piece 41 and the second spring piece 42 against each other to prevent them from springing up too much and causing positional displacement, thereby further ensuring the stability of the double spring piece assembly 4.

[0038] Preferably, the double spring assembly 4 further includes a connector 43, and an adjustment platform 1116 is provided in the mounting cavity 111. The adjustment platform 1116 is located on the side of the first spring 41 facing away from the second spring 42. The adjustment platform 1116 has a screw hole connector 43 screwed into the screw hole. The connector 43 has a groove 431 around its circumference. One end of the first spring 41 has a V-shaped notch 411, which is engaged in the groove 431. In use, the height of the connector 43 can be adjusted to change the height of the groove 431, thereby adjusting the curvature of the first spring 41 to adjust the elastic force of the double spring assembly 4.

[0039] In summary, in this example, by setting a first abutment platform inside the mounting cavity to support the second spring, and setting a support platform on the cover to support the bottom of the second spring, when the second spring heats up due to current overload and generates mechanical repulsion against the first spring, the second spring is supported by the first abutment platform and the support platform, which can effectively prevent it from directly contacting the surface of the second terminal, thus reducing the heating surface of the second terminal and ensuring the stability of the double spring assembly's disengagement, thereby improving the stability of the product.

[0040] The above description is merely an embodiment of this utility model and is not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.

Claims

1. A push-type overload switch characterized by, The application relates to a shell, which comprises a shell body and a cover, the shell body has a mounting cavity inside, one side of the shell body is provided with an opening, and the cover covers the opening; a pressing assembly is arranged in the mounting cavity and extends out of the shell body from the top end of the shell body; a terminal assembly is arranged at the bottom end of the shell body and comprises first terminals and second terminals arranged along the width direction of the shell body, one end of the first terminals and the second terminals is fixed in the mounting cavity, and the other end of the first terminals and the second terminals extends out of the shell body from the bottom of the shell body, wherein the first terminals are provided with lower contact heads, and the lower contact heads are opposite to the pressing assembly; and a double spring assembly comprises first springs and second springs, one end of the first springs is fixed to the inner wall of the mounting cavity near the first terminals, one end of the second springs is fixed to the second terminals and is electrically connected to the second terminals, the other end of the first springs and the second springs is clamped to each other, one end of the pressing assembly penetrates through the second springs and is fixed to the second springs; the inner wall of the mounting cavity near the second terminals is provided with a first abutting table, and the first abutting table abuts against the second springs. The inner wall of the mounting cavity is further provided with a right-angle table, the right-angle table is arranged below the first abutting table and forms a first clamping groove between the first abutting table and the right-angle table, one end of the second terminals is bent along the right-angle table and is clamped in the first clamping groove, and the width D1 of the right-angle table is greater than the width D2 of the abutting table. One side of the cover is provided with a supporting table, the supporting table is located between the second springs and the right-angle table when the cover is closed, and the thickness H1 of the supporting table is greater than the thickness H2 of the second terminals. The mounting cavity is further provided with a baffle, the baffle is located on the side of the right-angle table facing the first terminals, a fixed gap is formed between the baffle and the right-angle table, one end of the second terminals is located in the fixed gap, one side of the second terminals facing the baffle is provided with a first clamping head, one end of the second springs is also located in the fixed gap and is provided with a first clamping hole, the first clamping head is clamped in the first clamping hole and abuts against the baffle through the first clamping hole. The cover is further provided with a second abutting table, the second abutting table is opposite to the fixed gap, the second abutting table is located in the fixed gap and abuts against one side of the second abutting table and one side of the second terminals when the cover is closed. The pressing assembly comprises a pressing rod, an elastic member and an upper contact head, the top center of the shell is provided with an opening, the pressing rod comprises a rod body and a limiting head, one end of the rod body is located in the mounting cavity, the other end of the rod body extends out of the shell through the opening, the limiting head is arranged at one end of the rod body located in the mounting cavity, the elastic member is sleeved on the rod body and abuts against the limiting head and the top wall of the mounting cavity at two ends, the upper contact head is fixed to one end of the limiting head, and the second springs are clamped between the limiting head and the contact head.

2. The push-type overload switch according to claim 1, characterized by ​ 3. The push-type overload switch according to claim 2, wherein ​ 4. The push-type overload switch according to claim 2, wherein ​ 5. The push-type overload switch according to claim 4, wherein ​ 6. The push-type overload switch according to claim 1, wherein ​ 7. The push-type overload switch according to claim 6, wherein The second elastic sheet also has a first through hole opposite to the opening, the upper contact head comprises a first contact body and a first connecting head, the outer diameter of the first contact body is larger than that of the connecting head, one end of the second elastic sheet is located between the upper contact head and the limiting head, the first connecting head is connected to the limiting head after passing through the opening from the lower surface of the second elastic sheet, and the upper surface of the first contact body abuts against the second elastic sheet.

8. The push-type overload switch according to claim 7, wherein The first terminal has a bending section at one end located in the mounting cavity, the bending section is bent towards the center of the bottom of the mounting cavity, and a second through hole opposite to the upper contact head is arranged on the bending section, the lower contact head comprises a second contact body and a second connecting head, the outer diameter of the second contact body is also larger than that of the second connecting head, the second contact body is located on the upper surface of the bending section of the first terminal, one end of the second connecting head is connected to the second contact body, and the other end is connected to the bottom of the mounting cavity after passing through the second through hole.

9. The push-type overload switch according to claim 1, wherein The upper wall of the mounting cavity is also provided with two limiting blocks, the two limiting blocks are arranged above the first elastic sheet and the second elastic sheet and located on the movement paths of the first elastic sheet and the second elastic sheet.

10. The push-type overload switch according to claim 1, wherein The double-elastic-sheet assembly also comprises a connecting piece, the mounting cavity is also provided with an adjusting table, the adjusting table is arranged on the side of the first elastic sheet away from the second elastic sheet, the adjusting table is provided with a threaded hole, the connecting piece is screwed into the threaded hole, the top end of the connecting piece has a clamping groove, one end of the first elastic sheet has a V-shaped clamping opening, and the V-shaped clamping opening is clamped in the clamping groove.

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