Overload protection switch

Abstract

The utility model relates to an overload protection switch, which comprises a shell, a connecting assembly, an overload assembly and a switch assembly, and is characterized in that the connecting assembly comprises a live wire pin and a first null line pin, and the live wire pin and the first null line pin are fixedly arranged on the shell; the overload assembly comprises a thermal bimetallic strip, one end of the thermal bimetallic strip is electrically connected with the live wire pin, and when the first null line pin is electrically connected with the live wire pin, the other end of the thermal bimetallic strip abuts against and is electrically connected with the first null line pin; the switch assembly comprises a button and a lifting piece, the button is in sliding fit with the shell, the lifting piece comprises a main body part, a crimping part and a lifting part, the main body part is rotationally connected to the shell, a lifting groove is formed in the main body part, the thermal bimetallic strip penetrates through the lifting groove, the crimping part is fixedly connected to one side of the main body part, and the lifting part is fixedly connected to one end of the main body part. The overload switch has the advantages that the overload switch is sufficiently sensitive to the overload of the switch, and the phenomenon that the thermal bimetallic strip needs larger deformation to realize the disconnection of the switch along with use is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of switches, in particular to an overload protection switch. BACKGROUND

[0002] With the continuous improvement of people's living standards, various household appliances enter thousands of households, and with them come the occurrence of safety accidents such as fires caused by improper use of household appliances or quality problems of household appliances causing circuit overload or short circuit. The research and development of power safety products such as overload protection switches have received widespread attention.

[0003] The existing overload protection switch generally includes a shell, a connecting assembly, a thermal bimetallic sheet, and a pull plate. The connecting assembly includes a neutral line pin and a live line pin, both of which are fixedly arranged in the shell. One end of the thermal bimetallic sheet is fixedly and electrically connected with the live line pin. The switch assembly includes a button and a pull plate. The button is rotatably connected to the shell. One end of the pull plate is connected with the button, and the other end of the pull plate is connected with the other end of the thermal bimetallic spring. When the switch is off, the button is rotated in one direction, and the pull plate lifts the thermal bimetallic sheet. When the switch is on, the button is rotated in the other direction, thereby driving the pull plate to press down the thermal bimetallic sheet. When the switch is overloaded, the excessive current causes the thermal bimetallic sheet to heat, expand, and deform. Then the thermal bimetallic sheet is popped up and pushes the button to rotate in one direction through the pull plate, thereby making the switch off.

[0004] According to the related technology in the above, when the switch is overloaded, the thermal bimetallic sheet needs to heat, expand, and deform to a certain extent to have enough elastic force to push the button to rotate, thereby realizing the off of the switch. Therefore, the overload switch is not sensitive enough to the switch overload. Moreover, when the frictional resistance between the button and the shell increases with the use of the switch, the thermal bimetallic sheet needs to deform more to push the button to rotate. A greater deformation of the thermal bimetallic sheet requires a higher overload temperature, which leads to the overload temperature of the thermal bimetallic sheet exceeding the safe range, and further leads to the damage of the shell due to the excessively high overload temperature of the thermal bimetallic sheet. SUMMARY

[0005] In order to make the overload switch sensitive enough to the switch overload and not easily lead to the thermal bimetallic sheet needing a greater deformation to realize the off of the switch with the use, the present application provides an overload protection switch.

[0006] The overload protection switch provided by the present application adopts the following technical scheme:

[0007] An overload protection switch includes a shell, a connecting assembly, an overload assembly, and a switch assembly. The connecting assembly includes a live line pin and a first neutral line pin. Both the live line pin and the first neutral line pin are fixedly arranged in the shell.

[0008] The overload assembly comprises a thermal bimetallic strip, one end of the thermal bimetallic strip is electrically connected with the live pin, when the first neutral pin and the live pin are electrically connected, the other end of the thermal bimetallic strip abuts against and is electrically connected with the first neutral pin;

[0009] The switch assembly comprises a button and a pull tab, the button is slidingly fitted in the housing, the pull tab comprises a main body, a pressing portion and a pulling portion, the main body is rotationally connected with the housing, the main body is provided with a pulling slot, the thermal bimetallic strip is arranged in the pulling slot, the pressing portion is fixedly connected with one side of the main body, and the pulling portion is fixedly connected with one end of the main body;

[0010] When the button slides towards the housing, the button is connected with the pressing portion and pushes the main body to rotate until the other end of the thermal bimetallic strip abuts against the first neutral pin, and the button is disconnected with the pressing portion, when the button slides away from the housing, the button is connected with the pulling portion and pushes the main body to rotate until the other end of the thermal bimetallic strip is disconnected with the first neutral pin.

[0011] By adopting the above technical scheme, when the switch is turned on, the button slides towards the housing, when the button slides to the set position, the button is connected with the pressing portion, thereby pushing the pressing portion to rotate, thereby pushing the main body to rotate, thereby driving the thermal bimetallic strip to abut against the first neutral pin, thereby enabling the live pin to be electrically connected with the first neutral pin, and at the same time, the connection between the button and the pressing portion is disconnected, when the switch is turned off, the button slides away from the housing, when the button slides to the set position, the button is connected with the pulling portion, as the button continues to slide, the button pushes the pulling portion to rotate, thereby driving the main body to rotate, thereby driving the thermal bimetallic strip to be disconnected with the first neutral pin, thereby enabling the live pin to be disconnected with the first neutral pin, and at the same time, the connection between the button and the pulling portion is disconnected;

[0012] When the switch is overloaded, the thermal bimetallic strip deforms due to overheating, so that the thermal bimetallic strip moves away from the first zero line pin direction, thereby driving the main body to rotate, so that the crimping part rotates to the position of the crimping part when the switch is off, at this time, the button resets and passes through the set position, and is not connected with the pulling part, but is directly reset, and then when the button is pushed to slide towards the shell, the button slides to the set position, the button is connected with the crimping part, and the above working stroke is continued, which improves that when the switch is overloaded, the thermal bimetallic strip needs to be heated and deformed to a certain extent, so as to have enough elastic force to drive the button to rotate, so as to realize the off of the switch, so that the overload switch is not sensitive enough to the switch overload, and when the friction resistance between the button and the shell increases with the use of the switch, the thermal bimetallic strip needs to be deformed more to drive the button to rotate, and the greater deformation of the thermal bimetallic strip requires a higher overload temperature, thereby causing the overload temperature of the thermal bimetallic strip to exceed the safe range, thereby causing the shell to be damaged due to the high overload temperature of the thermal bimetallic strip.

[0013] Optionally, the switch assembly further comprises a driving slider, a driving spring and a toggle lever, the driving slider is slidably connected to the shell and fixedly connected with the button, one end of the driving spring is connected with the driving slider, the other end of the driving spring is connected with the shell, the driving slider is provided with a toggle slot, the shell is provided with a driving slot, one end of the toggle lever is provided in the toggle slot, the other end of the toggle lever is provided in the driving slot, the driving slot comprises an off part and a pass part, the off part and the pass part are communicated, and the other communication port of the off part and the pass part is a pass port, and the one communication port of the off part and the pass part is an off port.

[0014] When the switch is off, the crimping part is located at the top of the pass port, and the toggle lever is provided in the off part; when the switch is on, the pulling part is located at the top of the off port, and the toggle lever is provided in the pass part.

[0015] By adopting the above technical scheme, when the button slides towards the shell, the button drives the driving slider to slide towards the shell, thereby driving the toggle lever to slide along the off part towards the pass part, when the toggle lever slides to the pass port, the toggle lever abuts against the crimping part located at the top of the pass port, and then the toggle lever drives the crimping part to rotate, so that the switch is switched from off to on, at the same time, the toggle lever is disengaged from the abutting cooperation with the crimping part, and the toggle lever is engaged with the pass part slot.

[0016] When the switch needs to be switched from the on state to the off state, the button is pressed, so that the button slides towards the shell, so that the toggle rod is disengaged from the clamping fit with the on path part, and when the driving spring pushes the driving slider to reset, the toggle rod slides along the on path part towards the off path part, when the toggle rod slides to the off path, the toggle rod abuts the pull part, and then the toggle rod pushes the pull part to rotate, so that the switch is switched from the on state to the off state, and at the same time the toggle rod is disengaged from the abutting fit with the pull part, and the toggle rod is clamped with the off path part slot, so that the switch is switched between the on state and the off state more simply and conveniently, and the button and the pull piece are not directly connected, so that the pull piece is not easy to drive the button to slide, and the usability is better.

[0017] Optionally, the driving groove slot is fixedly provided with a first inclined block and a second inclined block, the first inclined block is located at the on path, and the first inclined block is inclined from the end close to the off path part to the end close to the on path part from bottom to top; the second inclined block is inclined from the end close to the on path part to the end close to the off path part from bottom to top.

[0018] Optionally, the switch assembly further comprises a light-emitting plate, the light-emitting plate is clamped and fixed with the button, and the button is bright when the light-emitting plate emits light.

[0019] Optionally, the switch assembly further comprises two communication springs, the two communication springs are located between the button and the shell, one end of the two communication springs is fixedly connected with the light-emitting plate, and the other end of the two communication springs is fixedly connected with the shell.

[0020] Optionally, the connection assembly further comprises a second zero line pin, the second zero line pin is fixedly arranged on the shell.

[0021] One end of the two communication springs is electrically connected with the light-emitting plate, one end of one of the two communication springs is electrically connected with the live wire pin, and the other end of the other communication spring is electrically connected with the second zero line pin.

[0022] Optionally, the overload assembly further comprises an electric contact and an electric column, the electric contact is fixedly and electrically connected with the thermal bimetallic strip, and the electric column is fixedly and electrically connected with the first zero line pin; when the electric contact and the electric column abut, the live wire pin and the first zero line pin are electrically connected.

[0023] Optionally, the overload assembly further comprises an adjusting screw and an overload spring, the adjusting screw is threadedly connected with the shell, one end of the overload spring is provided with a fixing groove, the other end of the overload spring is provided with an overload groove penetratingly arranged, the overload spring is located between the adjusting screw and the thermal bimetallic strip, the adjusting screw is penetratingly and clampingly fitted in the fixing groove, and the thermal bimetallic strip is penetratingly and clampingly fitted in the overload groove.

[0024] Optionally, the shell comprises a main shell part and a cover shell part, the main shell part is provided with a plurality of clamping grooves, the cover shell part is fixedly provided with a plurality of clamping blocks, when each clamping block is arranged in and clamped in each clamping groove, the main shell part and the cover shell part are fixedly connected.

[0025] Optionally, the main shell part is fixedly provided with two sliding columns, the button is provided with two sliding holes penetrating through the button, when the button is slidingly matched with the shell, the two sliding columns are respectively arranged in and slidingly matched with the two sliding holes, the outer circumferential surface of each sliding column is fixedly provided with a clamping protrusion, when the button is reset, the two clamping protrusions are respectively in abutting engagement with the button.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. When the switch is on, the button slides towards the shell, when the button slides to the set position, the button is connected with the pressing part, thereby driving the pressing part to rotate, thereby driving the main body part to rotate, thereby driving the thermal bimetallic strip to abut against the first zero line pin, thereby making the live pin and the first zero line pin electrically connected, at the same time, the connection between the button and the pressing part is disconnected, when the switch is off, the button resets away from the shell, when the button slides to the set position, the button is connected with the pulling part, as the button continues to slide, the button drives the pulling part to rotate, thereby driving the main body part to rotate, thereby driving the thermal bimetallic strip to abut against the first zero line pin, thereby making the live pin and the first zero line pin electrically connected, at the same time, the connection between the button and the pulling part is disconnected;

[0028] When the switch is overloaded, the thermal bimetallic strip deforms due to overheating, thereby driving the thermal bimetallic strip to move away from the first zero line pin, thereby driving the main body part to rotate, thereby driving the pressing part to rotate to the position of the pressing part when the switch is off, at this time, the button resets and passes through the set position, and does not connect with the pulling part, but directly resets, and then when the button slides towards the shell, the button slides to the set position, the button is connected with the pressing part, and the above working stroke continues, which improves that when the switch is overloaded, the thermal bimetallic strip needs to be heated and expanded to a certain extent to have enough elastic force to drive the button to rotate, thereby realizing the off of the switch, thereby making the overload switch not sensitive enough to the overload of the switch, and as the frictional resistance between the button and the shell increases, the thermal bimetallic strip needs to be deformed more to drive the button to rotate, and the greater deformation of the thermal bimetallic strip needs a higher overload temperature, thereby causing the overload temperature of the thermal bimetallic strip to exceed the safe range, thereby causing the shell to be damaged due to the excessively high overload temperature of the thermal bimetallic strip. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a schematic diagram of the overall structure of the embodiment of the present application;

[0030] Figure 2 is an exploded view of the structure of the application;

[0031] Figure 3 is an exploded view of the structure of the shell of the application;

[0032] Figure 4 is an exploded view of the structure of the connecting assembly of the application;

[0033] Figure 5 is an exploded view of the structure of the overload assembly of the application;

[0034] Figure 6 is an exploded view of the structure of the button of the application;

[0035] Figure 7 is an enlarged view of part A of Figure 4

[0036] Figure 8 is an exploded view of the structure of the pull tab of the application;

[0037] Figure 9 is an exploded view of the structure of the driving assembly of the application;

[0038] Figure 10 is an exploded view of the structure of the toggle lever of the application;

[0039] Figure 11 is a schematic view of the process of switching the switch from the off state to the on state;

[0040] Figure 12 is a schematic view of the process of switching the switch from the on state to the off state.

[0041] ​Explanation of reference signs: 1, housing; 11, main housing part; 111, overload cavity; 112, clamping groove; 113, sliding column; 1131, clamping protrusion; 114, driving groove; 1141, breaking part; 1142, passage part; 1143, passage opening; 1144, breaking opening; 1145, first inclined block; 1146, second inclined block; 12, cover housing part; 121, clamping block; 2, connecting assembly; 21, live pin; 22, first neutral pin; 23, second neutral pin; 3, overload assembly; 31, thermal bimetallic strip; 32, power contact; 33, power column; 34, adjusting screw; 35, overload spring; 351, fixing groove; 352, overload groove; 4, switch assembly; 41, button; 411, sliding hole; 42, light-emitting plate; 43, communication spring; 44, pulling piece; 441, main body part; 4411, pulling groove; 442, pressing part; 443, pulling part; 45, driving slider; 451, pushing groove; 46, driving spring; 47, pushing rod; 471, first rod body; 472, second rod body; 473, third rod body. DETAILED DESCRIPTION

[0042] The following will be described in detail with reference to the accompanying drawings. Figures 1-12 The present application is further described in detail.

[0043] The present application discloses an overload protection switch. Referring to Figure 1 and Figure 2 An overload protection switch includes a housing 1, a connecting assembly 2, an overload assembly 3, and a switch assembly 4, the connecting assembly 2, the overload assembly 3, and the switch assembly 4 are all arranged in the housing 1.

[0044] Referring to Figure 3 The housing 1 includes a main housing part 11 and a cover housing part 12, the main housing part 11 is provided with an overload cavity 111 close to one side of the cover housing part 12, the main housing part 11 is provided with a plurality of clamping grooves 112, the cover housing part 12 is fixedly provided with a plurality of clamping blocks 121, when each clamping block 121 is arranged through and clamped and fixed in each clamping groove 112, the main housing part 11 and the cover housing part 12 are fixedly connected, and the cover housing part 12 seals the overload cavity 111.

[0045] Referring to Figure 4 and Figure 5The connecting assembly 2 comprises a live wire pin 21, a first zero line pin 22, and a second zero line pin 23. The live wire pin 21 is clamped and fixed to the main shell part 11 and located at one end of the overload cavity 111. The live wire pin 21 is used for electrical connection with a live wire. The first zero line pin 22 is clamped and fixed to the main shell part 11 and located at one end of the overload cavity 111. The first zero line pin 22 is used for electrical connection with a zero line. The length direction of the live wire pin 21 is towards one side of the thickness direction of the main shell part 11. The length direction of the first zero line pin 22 is towards the other side of the thickness direction of the main body part 441. The second zero line pin 23 is clamped and fixed to the side of the main body part 441.

[0046] With reference to Figure 4 and Figure 5 The overload assembly 3 comprises a thermal bimetallic strip 31, an electrical contact 32, and an electrical contact column 33. In the embodiment, the thermal bimetallic strip 31 has elasticity and thermal deformation capability. The thermal bimetallic strip 31 is located in the overload cavity 111. One end of the thermal bimetallic strip 31 is clamped and fixed to the main shell 1 and electrically connected with the live wire pin 21. The other end of the thermal bimetallic strip 31 is fixed and electrically connected with the electrical contact 32. The electrical contact column 33 is fixed and electrically connected with the first zero line pin 22. When the electrical contact 32 and the electrical contact column 33 are in abutting cooperation, the thermal bimetallic strip 31 is electrically connected with the first zero line pin 22, so that the live wire pin 21 and the first zero line pin 22 are electrically connected, thereby making the switch in a passing state. When the electrical contact 32 and the electrical contact column 33 are disengaged from the abutting cooperation, the thermal bimetallic strip 31 is disengaged from the electrical connection with the first zero line pin 22, so that the live wire pin 21 is disengaged from the electrical connection with the first zero line pin 22, thereby making the switch switch from the passing state to a breaking state.

[0047] With reference to Figure 4 and Figure 5 The overload assembly 3 further comprises an adjusting screw 34 and an overload spring 35. The adjusting screw 34 is threadedly connected with the main shell part 11 and located at one end of the overload cavity 111. The overload spring 35 is in a U shape and has elasticity. The overload spring 35 is located in the overload cavity 111. One end of the overload spring 35 is provided with a fixed groove 351. The other end of the overload spring 35 is provided with an overload groove 352 which is arranged in a penetrating manner. The overload spring 35 is located between the adjusting screw 34 and the thermal bimetallic strip 31. The adjusting screw 34 is arranged in and clamped in the fixed groove 351, so that the adjusting screw 34 is clamped with the overload spring 35. The other end of the thermal bimetallic strip 31 which is away from the live wire pin 21 is arranged in and clamped in the overload groove 352, so that the thermal bimetallic strip 31 is clamped with the overload spring 35.

[0048] When the switch overload thermal bimetallic strip 31 is overheated and deformed, the overcurrent causes the thermal bimetallic strip 31 to heat and expand and deform, so that the thermal bimetallic strip 31 has a tendency to tilt away from the first neutral line pin 22, wherein the thermal bimetallic strip 31 deforms most at the end close to the overload spring 35, and the thermal bimetallic strip 31 tilts away from the first neutral line pin 22, and the end of the overload spring 35 moves away from the first neutral line pin 22, when the thermal bimetallic strip 31 is basically in a horizontal state, the end of the overload spring 35 close to the thermal bimetallic strip 31 moves to the overload spring 35, so that the direction of the elastic force of the overload spring 35 changes to the direction away from the first neutral line pin 22, so that the overload spring 35 tilts the thermal bimetallic strip 31, so that the electrical contact and the electrical column 33 are separated to form a circuit break, and the overload protection is achieved.

[0049] By adjusting the screw 34 to move closer to or away from the overload cavity 111, the height of the overload spring 35 is controlled, and the specifications of the product are finely adjusted, when the adjusting screw 34 moves closer to the overload cavity 111, the time of the thermal bimetallic strip 31 breaking under overload is longer, and when the adjusting screw 34 moves away from the overload cavity 111, the time of the thermal bimetallic strip 31 breaking under overload is shorter.

[0050] Referring to Figure 3 and Figure 6 , the switch assembly 4 comprises a button 41, two sliding columns 113 are fixedly arranged on one side of the main shell part 11, the button 41 is provided with two sliding holes 411, the two sliding holes 411 are symmetrically distributed along the center of the button 41, and the two sliding columns 113 are respectively arranged in the two sliding holes 411 and are in sliding fit with the two sliding holes 411, the button 41 is in sliding fit with the main shell part 11, the outer circumferential surface of each sliding column 113 is fixedly provided with a clamping protrusion 1131, and the two clamping protrusions 1131 are in abutting fit with the button 41 when the switch is in a circuit breaking state.

[0051] Referring to Figure 2 and Figure 6 , the switch assembly 4 further comprises a light-emitting plate 42 and two communication springs 43, the light-emitting plate 42 is clamped and fixed to the side of the button 41 close to the main shell part 11, the two communication springs 43 are located between the button 41 and the shell body 1, one end of each communication spring 43 is fixedly connected with the light-emitting plate 42 and is in electrical connection, the other end of each communication spring 43 is fixedly connected with the shell body 1, the other end of one communication spring 43 is in electrical connection with the live wire pin 21, and the other end of the other communication spring 43 is in electrical connection with the second neutral line pin 23, so that the light-emitting plate 42 is always in a constant bright state when the switch is powered on, so that the button 41 always remains constant, and it is easier to find the position of the button 41.

[0052] Referring to Figure 7The main shell part 11 is provided with a driving groove 114 near the cover shell part 12, the driving groove 114 comprises a cut-off part 1141 and a passage part 1142, the cut-off part 1141 and the passage part 1142 are communicated, the cut-off part 1141 is located away from the main shell part 11, the passage part 1142 is located near the main shell part 11, another communication port of the cut-off part 1141 and the passage part 1142 is a passage port 1143, and a communication port of the cut-off part 1141 and the passage part 1142 is a cut-off port 1144; the first inclined block 1145 is located at the passage port 1143, the first inclined block 1145 is arranged to be inclined from the end near the cut-off part 1141 to the end near the passage part 1142 from bottom to top, and the second inclined block 1146 is arranged to be inclined from the end near the passage part 1142 to the end near the cut-off part 1141 from bottom to top.

[0053] With reference to Figure 8 The switch assembly 4 further comprises a pull tab 44, the pull tab 44 comprises a main body part 441, a press contact part 442 and a pull part 443, the main body part 441 is rotationally connected to the shell 1, the main body part 441 is provided with a pull groove 4411, the pull groove 4411 in the embodiment of the application is in a groove shape, one side of the thermal bimetallic strip 31 is arranged in the pull groove 4411 and is in clamping cooperation with the main body part 441, the press contact part 442 is fixedly connected to one side of the main body part 441, and the pull part 443 is fixedly connected to one end of the main body part 441; when the switch is cut off, the press contact part 442 is located at the top of the passage port 1143, and the toggle lever 47 is arranged in the cut-off part 1141; when the switch is in passage, the pull part 443 is located at the top of the cut-off port 1144, and the toggle lever 47 is arranged in the passage part 1142.

[0054] With reference to Figure 9 And Figure 10 The switch assembly 4 further comprises a driving sliding block 45, a driving spring 46 and a toggle lever 47, the driving sliding block 45 is in sliding cooperation with the main shell part 11 and is fixedly connected with the light-emitting plate 42, the driving spring 46 is located between the driving sliding block 45 and the main shell part 11, one end of the driving spring 46 is connected with the driving sliding block 45, and the other end of the driving spring 46 is connected with the main shell part 11; the toggle lever 47 comprises a first lever body 471, a second lever body 472 and a third lever body 473, the first lever body 471, the second lever body 472 and the third lever body 473 are fixedly connected in sequence, the driving sliding block 45 is provided with a toggle groove 451, the first lever body 471 is arranged in the toggle groove 451, and the third lever body 473 is arranged in the driving groove 114.

[0055] With reference to Figure 11, when the switch is switched from the off state to the on state, the button 41 is pressed, so that the button 41 is pushed to slide towards the shell 1, the button 41 drives the driving slider 45 to slide towards the shell 1, so that the third rod body 473 is driven to slide along the off portion 1141 towards the on portion 1142, when the third rod body 473 moves to the set position, the third rod body 473 slides along the first inclined block 1145 towards the cover shell portion 12, until the third rod body 473 moves to the on port 1143, the third rod body 473 abuts and cooperates with the pressure connecting portion 442, so that when the third rod body 473 continues to move, the pressure connecting portion 442 is pushed to rotate, so that the pull tab 44 is driven to rotate, so that the pull portion 443 rotates to the top of the off port 1144, the main body portion 441 pushes the thermal bimetallic strip 31 to move towards the first zero line pin 22, until the electrical contact 32 and the electrical column 33 abut and cooperate, at the same time, the third rod body 473 is separated from the abutment with the pressure connecting portion 442 and enters the on portion 1142 from the off portion 1141, at this time, the pushing of the button 41 is stopped, and the third rod body 473 is engaged with the on portion 1142 groove.

[0056] Referring to Figure 12 , when the switch is switched from the on state to the off state, the button 41 is pressed until the button 41 abuts against the main shell portion 11, and then the button 41 is released, so that the third rod body 473 is disengaged from the engagement between the third rod body 473 and the on portion 1142, and the driving spring 46 pushes the driving slider 45 to reset, the third rod body 473 slides along the on portion 1142 towards the off portion 1141, when the third rod body 473 moves to the set position, the third rod body 473 slides along the second inclined block 1146 towards the cover shell portion 12, until the third rod body 473 moves to the off port 1144, the third rod body 473 abuts and cooperates with the pull portion 443, so that when the third rod body 473 continues to move, the pull portion 443 is pushed to rotate, so that the pull tab 44 is driven to rotate, so that the pressure connecting portion 442 is rotated to the top of the on port 1143, the main body portion 441 pushes the thermal bimetallic strip 31 to move away from the first zero line pin 22, until the electrical contact 32 and the electrical column 33 are disengaged from the abutment, at the same time, the third rod body 473 is separated from the abutment with the pull portion 443 and enters the off portion 1141 from the on portion 1142, until the driving slider 45 is reset, at this time, the third rod body 473 is engaged with the off portion 1141 groove, so that the switch completes a cycle of switching from the off state to the on state and then to the off state.

[0057] The implementation principle of the overload protection switch in the embodiment of the application is as follows: when the thermal bimetallic strip 31 of the switch is deformed and pops up in a direction away from the first zero line pin 22, the thermal bimetallic strip 31 pushes the pull-out piece 44 to rotate, so that the position of the pull-out piece 44 is changed from the through path rotation state to the open circuit state, that is, the pull-out part 443 is separated from the top of the open circuit opening 1144, the crimping part 442 is rotated to the top of the through path opening 1143, and when the pull-out piece 44 rotates, the position of the third rod body 473 remains unchanged and is always connected with the through path part 1142, so that the position of the button 41 remains unchanged, and thus the change of the position of the pull-out piece 44 does not easily affect the position of the button 41. When the switch is pressed and then released, the third rod body 473 is switched from being connected with the through path part 1142 to being connected with the open circuit part 1141, and the switch enters the next opening and closing cycle. When the switch is overloaded, the thermal bimetallic strip 31 needs to be heated and expanded to a certain degree to have enough elastic force to push the button 41 to rotate, so as to realize the open circuit of the switch, so that the overload switch is not sensitive enough to the switch overload. When the frictional resistance between the button 41 and the shell 1 increases with the use of the switch, the thermal bimetallic strip 31 needs to be deformed more to push the button 41 to rotate, and the greater deformation of the thermal bimetallic strip 31 requires a higher overload temperature, which further causes the overload temperature of the thermal bimetallic strip 31 to exceed the safe range, and further causes the shell 1 to be damaged due to the excessively high overload temperature of the thermal bimetallic strip 31.

[0058] The above are preferred embodiments of the application, and do not limit the protection scope of the application. Therefore, equivalent changes made on the basis of the structure, shape, and principle of the application should be covered within the protection scope of the application.

Claims

1. An overload protection switch, characterized in that: It includes a housing (1), a connecting component (2), an overload component (3), and a switching component (4). The connecting component (2) includes a live wire pin (21) and a first neutral wire pin (22). Both the live wire pin (21) and the first neutral wire pin (22) are fixedly disposed on the housing (1). The overload component (3) includes a thermal bimetallic strip (31). One end of the thermal bimetallic strip (31) is electrically connected to the live wire pin (21). When the first neutral wire pin (22) and the live wire pin (21) are electrically connected, the other end of the thermal bimetallic strip (31) abuts against and is electrically connected to the first neutral wire pin (22). The switch assembly (4) includes a button (41) and a lifting piece (44). The button (41) is slidably fitted to the housing (1). The lifting piece (44) includes a main body (441), a pressing part (442), and a lifting part (443). The main body (441) is rotatably connected to the housing (1). The main body (441) has a lifting groove (4411). The hot bimetallic strip (31) passes through the lifting groove (4411). The pressing part (442) is fixedly connected to one side of the main body (441), and the lifting part (443) is fixedly connected to one end of the main body (441). When the button (41) slides closer to the housing (1), the button (41) connects with the pressing part (442) and pushes the main body (441) to rotate until the other end of the hot bimetallic strip (31) abuts against the first neutral wire pin (22). The button (41) then disconnects from the pressing part (442). When the button (41) slides away from the housing (1), the button (41) connects with the lifting part (443) and pushes the main body (441) to rotate until the other end of the hot bimetallic strip (31) disconnects from the first neutral wire pin (22).

2. An overload protection switch according to claim 1, characterized in that: The switch assembly (4) further includes a drive slider (45), a drive spring (46), and a toggle lever (47). The drive slider (45) is slidably fitted into the housing (1) and fixedly connected to the button (41). One end of the drive spring (46) is connected to the drive slider (45), and the other end of the drive spring (46) is connected to the housing (1). The drive slider (45) has a toggle groove (451), and the housing (1) has a drive groove (114). The toggle lever (47) One end of the lever (47) is inserted into the actuation groove (451), and the other end of the actuation lever (47) is inserted into the drive groove (114). The drive groove (114) includes a circuit breaker (1141) and a passage (1142). The circuit breaker (1141) and the passage (1142) are connected. Another connection between the circuit breaker (1141) and the passage (1142) is a passage opening (1143). Another connection between the circuit breaker (1141) and the passage (1142) is a circuit breaker opening (1144). When the switch is open, the crimping part (442) is located at the top of the passage opening (1143), and the toggle lever (47) passes through the open part (1141). When the switch is closed, the lifting part (443) is located at the top of the open part (1144), and the toggle lever (47) passes through the passage opening (1142).

3. An overload protection switch according to claim 2, characterized in that: The drive groove (114) is fixedly provided with a first inclined block (1145) and a second inclined block (1146). The first inclined block (1145) is located at the passage opening (1143). The first inclined block (1145) is inclined from bottom to top from the end near the circuit breaker (1141) towards the end near the passage (1142). The second inclined block (1146) is inclined from bottom to top from the end near the passage (1142) towards the end near the circuit breaker (1141).

4. An overload protection switch according to claim 1, characterized in that: The switch assembly (4) also includes a light-emitting plate (42), which is snapped and fixed to the button (41). When the light-emitting plate (42) emits light, the button (41) lights up.

5. An overload protection switch according to claim 4, characterized in that: The switch assembly (4) also includes two connecting springs (43), both of which are located between the button (41) and the housing (1). One end of each of the two connecting springs (43) is fixedly connected to the light-emitting plate (42), and the other end of each of the two connecting springs (43) is fixedly connected to the housing (1).

6. An overload protection switch according to claim 5, characterized in that: The connection component (2) further includes a second neutral pin (23), which is fixedly disposed on the housing (1); One end of each of the two connecting springs (43) is electrically connected to the light-emitting plate (42), the other end of one connecting spring (43) is electrically connected to the live wire pin (21), and the other end of the other connecting spring (43) is electrically connected to the second neutral wire pin (23).

7. An overload protection switch according to claim 1, characterized in that: The overload assembly (3) further includes a power contact (32) and a power post (33). The power contact (32) is fixed and electrically connected to the thermal bimetallic strip (31), and the power post (33) is fixed and electrically connected to the first neutral pin (22). When the power contact (32) and the power post (33) are in contact, the live pin (21) and the first neutral pin (22) are electrically connected.

8. An overload protection switch according to claim 7, characterized in that: The overload assembly (3) further includes an adjusting screw (34) and an overload spring (35). The adjusting screw (34) is threaded to the housing (1). One end of the overload spring (35) has a fixing groove (351), and the other end of the overload spring (35) has a through overload groove (352). The overload spring (35) is located between the adjusting screw (34) and the hot bimetallic strip (31). The adjusting screw (34) passes through and is engaged with the fixing groove (351), and the hot bimetallic strip (31) passes through and is engaged with the overload groove (352).

9. An overload protection switch according to claim 1, characterized in that: The housing (1) includes a main housing part (11) and a cover housing part (12). The main housing part (11) has multiple snap-fit ​​grooves (112), and the cover housing part (12) is fixedly provided with multiple snap-fit ​​blocks (121). When each snap-fit ​​block (121) passes through and snaps into each snap-fit ​​groove (112), the main housing part (11) and the cover housing part (12) are fixedly connected.

10. An overload protection switch according to claim 9, characterized in that: The main housing (11) is fixedly provided with two sliding posts (113), and the button (41) is provided with two through sliding holes (411). When the button (41) is slidably engaged with the housing (1), the two sliding posts (113) are respectively inserted and slidably engaged with the two sliding holes (411). The outer peripheral surfaces of the two sliding posts (113) are fixedly provided with snap-fit ​​protrusions (1131). When the button (41) is reset, the two snap-fit ​​protrusions (1131) abut against the button (41).

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