A new type of overload protection switch

Abstract

The present invention discloses a novel overload protection switch, which includes a protective housing, a switch body, pin 1 and pin 2, the switch body is installed on the top of the protective housing, one end of the switch body is located outside the protective housing, the other end of the switch body is located inside the protective housing, a metal sheet is provided at the bottom of the protective housing, the metal sheet, pin 1 and pin 2 are all installed inside the protective housing, one end of pin 1 is located between the switch body and the metal sheet, one end of pin 1 is elastically connected to one end of the switch body located inside the protective housing, one end of pin 2 is provided with a metal shrapnel, one end of the metal shrapnel is fixedly connected to pin 2, the other end of the metal shrapnel is provided with a moving contact, one end of the metal sheet is provided with a static contact 1 corresponding to pin 1, the other end of the metal sheet is provided with a static contact 2 in contact with the moving contact, and an ejection device is provided in the protective housing, and the ejection device passes through the top of the protective housing and is connected to the switch body. The beneficial effect of the present invention is: automatic circuit disconnection is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field related to protection switches, and in particular to a novel overload protection switch. Background Art

[0002] With the continuous development of society and the continuous improvement of people's quality of life, various electrical equipment have appeared in life. With the continuous aging of household appliances and circuits, or improper use of appliances, safety accidents such as circuit overload or short circuit are prone to occur. If a new overload protection switch is added between the appliance and the socket of the house circuit, the probability of safety accidents will be effectively reduced.

[0003] Especially when the electrical appliances commonly used in our family life are overloaded, when the household appliances encounter abnormal conditions during use, resulting in excessive current or excessive temperature, the existing plug devices cannot automatically disconnect the circuit because they have no automatic power-off function, which can easily cause damage to the appliances or even fire, bringing extremely serious consequences. Summary of the invention

[0004] The present invention aims to overcome the defect in the prior art that the circuit cannot be automatically disconnected when an abnormal situation occurs during the use of an electrical appliance, and provides a new overload protection switch that can automatically disconnect the circuit.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A novel overload protection switch comprises a protective shell, a switch body, a pin 1 and a pin 2, wherein the switch body is installed on the top of the protective shell, one end of the switch body is located outside the protective shell, and the other end of the switch body is located inside the protective shell. A metal sheet is provided at the bottom of the protective shell, and the metal sheet, the pin 1 and the pin 2 are all installed in the protective shell. One end of the pin 1 is located between the switch body and the metal sheet, and one end of the pin 1 is elastically connected to one end of the switch body located in the protective shell. A metal spring is provided at one end of the pin 2, and one end of the metal spring is fixedly connected to the pin 2. A moving contact is provided at the other end of the metal spring, a stationary contact 1 corresponding to the pin 1 is provided at one end of the metal sheet, and a stationary contact 2 in contact with the moving contact is provided at the other end of the metal sheet. An ejection device is provided in the protective shell, and the ejection device is located between the metal spring and the metal sheet. The bottom end of the ejection device is elastically connected to the bottom of the protective shell, and the top end of the ejection device passes through the top of the protective shell and is connected to the switch body.

[0007] The switch body is installed on the top of the protective shell, one end of the switch body is located outside the protective shell, and the other end of the switch body is located inside the protective shell. A metal sheet is provided at the bottom of the protective shell, and the metal sheet, pin one and pin two are all installed in the protective shell. One end of pin one is located between the switch body and the metal sheet, and one end of pin one is elastically connected to one end of the switch body located in the protective shell. One end of pin two is provided with a metal spring, and one end of the metal spring is fixedly connected to pin two. A moving contact is provided at the other end of the metal spring, and a static contact one corresponding to pin one is provided at one end of the metal sheet, and a static contact two in contact with the moving contact is provided at the other end of the metal sheet. An ejection device is provided in the protective shell, and the ejection device is located between the metal spring and the metal sheet. The bottom end of the ejection device is elastically connected to the bottom of the protective shell, and the top end of the ejection device passes through the top of the protective shell and is connected to the switch body. Pin one is electrically connected to the device, and pin two is electrically connected to the external power supply; the operator presses the switch body, and the circuit is connected. At this time, the static contact one on the metal sheet and pin one are in contact, and the current of the external power supply flows into the device through pin two, metal spring, metal sheet and pin one in sequence; the moving contact on the metal spring contacts the static contact two on the metal sheet, so that pin two can conduct the circuit through the metal spring and the metal sheet and pin one in sequence; the operator can control the connection or disconnection of the circuit through the switch body, and the switch body drives one end of pin one to move, so that one end of pin one contacts or separates from the static contact one on the metal sheet, and at the same time drives the ejection device to move, so that the moving contact on the metal spring contacts or contacts the static contact two on the metal sheet. Separation, so that the metal spring and pin 1 can contact or separate from the metal sheet at the same time, so that the protection switch can connect or disconnect the circuit with the external power supply while also connecting or disconnecting the circuit with the device, which is convenient to control and improves safety performance; in addition, if the circuit is overloaded, the metal spring will deform, so that the moving contact on the metal spring will automatically separate from the static contact 2 on the metal sheet. At this time, the ejection device moves upward under the elastic resetting action, and isolates the moving contact and the static contact 2, and at the same time drives the switch body to move upward, ejects the switch body, so that pin 1 is separated from the static contact 1, so that the protection switch can disconnect the current from the external power supply and the device respectively at the same time, so as to protect the device and the external power supply from damage, thereby achieving the purpose of automatically disconnecting the circuit.

[0008] Preferably, the other end of the pin one and the other end of the pin two both penetrate the protective shell and are located outside the protective shell, the metal spring sheet includes an arc-shaped sheet and a rectangular sheet, one side of the arc-shaped sheet is close to the ejection device, and the other side of the arc-shaped sheet corresponding to the arc-shaped sheet is far away from the ejection device, the arc-shaped sheet protrudes toward the side away from the ejection device to form an arc-shaped structure, one end of the arc-shaped sheet is fixedly connected to the long side of the rectangular sheet and forms an integral body with the rectangular sheet, one end of the arc-shaped sheet is fixedly connected to the pin two through the rectangular sheet, the other end of the arc-shaped sheet protrudes toward the side close to the ejection device to form a groove, and the arc-shaped sheet is connected to the pin two through the rectangular sheet. The shortest distance from one end of the pin 2 to which it is fixedly connected to the ejection device is greater than the shortest distance from the other end of the arc-shaped sheet to the ejection device, the bottom shape of the groove is a plane, the moving contact is fixedly mounted on the plane, the long side of the rectangular sheet and the groove are both located on the wide side of the arc-shaped sheet, the width of one end of the arc-shaped sheet fixedly connected to the pin 2 through the rectangular sheet is respectively smaller than the width of the other end and the length of the rectangular sheet, the long side of the arc-shaped sheet includes a straight side and an arc side, one end of the straight side is provided with a transition arc side, the straight side is uniformly transitioned to the wide side of the rectangular sheet through the transition arc side, and the other end of the straight side is uniformly transitioned to the arc side. The moving contact is fixedly installed at the bottom of the groove so that the moving contact can contact the second stationary contact. The bottom of the groove is a plane so that the moving contact can be fixedly installed. Under normal conditions, the design of the arc-shaped piece makes the moving contact close to the second stationary contact and contact it. When the circuit is overloaded or the temperature is too high, the arc structure on the arc-shaped piece changes the protrusion direction so that it protrudes to the side close to the ejection device, thereby realizing the separation of the moving contact from the second stationary contact. At the same time, the ejection device moves upward under the elastic resetting action and isolates the moving contact from the second stationary contact, while driving the switch body to move upward so that the first pin is separated from the first stationary contact. The working principle is simple and the response is fast and sensitive.

[0009] Preferably, a switch cap is provided at one end of the switch body outside the protective housing, a flange is provided at the edge of the open end of the switch cap, the top end of the ejection device passes through the top of the protective housing and contacts the flange, the switch body is fixedly connected to the bottom center of the switch cap, a spring 1 is provided at one end of the switch body inside the protective housing, and the switch body is elastically connected to the pin 1 through the spring 1. The switch cap is convenient for improving the comfort of the operator when pressing the switch body; the spring 1 is conducive to the normal operation of the switch body.

[0010] Preferably, the ejection device includes an isolation piece and a second spring, a limiting seat is provided at the bottom of the protective shell, a U-shaped groove matching the limiting seat is provided at the bottom end of the isolation piece, an L-shaped notch is provided on one side of the isolation piece, the L-shaped notch is located at the bottom end of the isolation piece and at the side of the U-shaped groove, one side of the L-shaped notch is perpendicular to the side wall of the U-shaped groove, the other side of the L-shaped notch is parallel to the side wall of the U-shaped groove, a limiting plate is provided on one side of the L-shaped notch that is perpendicular to the side wall of the U-shaped groove, the limiting plate is located at one end of one side of the L-shaped notch, and the other end of one side of the L-shaped notch is connected with the other side thereof, one end of the second spring is sleeved on the limiting plate, and the other end of the second spring is in contact with the bottom of the protective shell, and the other side corresponding to the isolation piece is provided with an avoidance groove one matching the moving contact and the second static contact respectively, the top end of one side of the isolation piece provided with the avoidance groove one passes through the top of the protective shell and contacts with the flange, and the top end of one side of the isolation piece provided with the L-shaped notch passes through the top of the protective shell and is located outside the protective shell. The isolating piece is matched with the limit seat through the U-shaped groove under the action of the second spring or the switch cap to achieve up and down movement, and the design is reasonable; the limit plate plays a positioning role for the second spring; when the moving contact on the metal spring is separated from the second static contact on the metal sheet, the isolating piece moves up under the resetting action of the second spring, and drives the switch body to move up through the switch cap, so that the pin one is separated from the first static contact on the metal sheet; the avoidance groove one facilitates the moving contact on the metal spring to contact the second static contact on the metal sheet through the avoidance groove one when the isolating piece moves down driven by the switch cap, so as to realize the conduction of the circuit.

[0011] Preferably, the protective housing comprises an upper cover, a base and a side cover, the base is located at the bottom of the upper cover, the side cover is located at the side of the upper cover, the top of the upper cover is fixedly connected with a mounting tube matching the switch body, two mounting blocks are arranged on the outer side wall of the mounting tube, one of which is located on one side of the mounting tube, and the other is located on the other side corresponding to the mounting tube, the top of the isolation sheet is provided with a second avoidance groove matching the mounting block, the second avoidance groove is located between the L-shaped notch and the first avoidance groove, the bottom of the second avoidance groove is located in the protective housing, the mounting block contacts the top of the upper cover, one side of the bottom of the upper cover is provided with a avoidance notch matching the first pin, the other side corresponding to the upper cover is snapped with the side cover, the other two sides of the upper cover are provided with a snapping groove, the base is provided with a snapping buckle matching the snapping groove, and the base can be detachably mounted on the upper cover by snapping the snapping buckle to match the snapping groove. The mounting block facilitates the installation and positioning of the protective switch; the upper cover is snapped with the side cover, and is connected to the base by snapping, which is convenient for the installation and maintenance of the protective switch.

[0012] Preferably, a mounting plate is provided at the center of the base, the pin 1 is located on one side of the mounting plate, the limit seat, pin 2 and metal spring are all located on the other side corresponding to the mounting plate, one end of the pin 1 is detachably mounted on the base and is provided with an elastic sheet, one end of the elastic sheet is located between the metal sheet and the switch body, and is elastically connected to the switch body through spring 1, the other end of the elastic sheet is provided with a transition arc surface, the elastic sheet is fixedly connected to pin 1 through the transition arc surface and forms an integral body, the elastic sheet and pin 1 form an acute angle, and the other end of pin 1 passes through the avoidance gap and is located outside the protective shell. The design of the elastic sheet is convenient for it to move downward when the switch body is pressed down, and contact with the static contact 1 on the metal sheet to conduct the circuit, and at the same time, when the switch body moves up, the metal spring is reset under its own elastic action, and separates from the static contact 1 on the metal sheet to disconnect the circuit, which is a reasonable design; the end of pin 1 located outside the protective shell is convenient for electrical connection with the device.

[0013] Preferably, the metal sheet is in an L-shape, the metal sheet is located on the side of pin 1, one side of the metal sheet is detachably connected to the base and is located on the same side of the mounting plate as pin 1, the static contact 1 is located on the side of the metal sheet detachably connected to the base, the static contact 1 is located at one end of one side of the metal sheet and corresponds to the position of the elastic sheet, the other end of one side of the metal sheet passes through the mounting plate and is fixedly connected to the other side of the metal sheet, and the static contact 2 is located on the other side of the metal sheet. The design of the metal sheet enables its two ends to simultaneously conduct or disconnect the circuit with the metal spring sheet or the elastic sheet, so that the protection switch can simultaneously disconnect the current from the external power supply and the device, respectively, to protect the device and the external power supply from damage.

[0014] Preferably, the shape of the pin 2 is L-shaped, one side of the pin 2 is detachably connected to the base, the other side of the pin 2 is fixedly connected to the arc-shaped sheet through a rectangular sheet, one end of the side of the pin 2 detachably connected to the base passes through the side cover and is located outside the protective shell, and the other end is fixedly connected to the other side and forms an integral body, an L-shaped limiting column is provided on the pin 2, one side of the L-shaped limiting column is fixedly connected to the side of the pin 2, the other side of the L-shaped limiting column is located between the mounting plate and the rectangular sheet, and the other end of the spring 2 is sleeved on one side of the L-shaped limiting column located between the mounting plate and the rectangular sheet and contacts the bottom of the protective shell. The limiting plate has a positioning effect on the top end of the spring 2, and the L-shaped limiting column has a positioning effect on the bottom end of the spring 2, thereby improving the position stability of the spring 2; one end of the pin 2 is located outside the protective shell for easy electrical connection with an external power supply.

[0015] Preferably, the limiting seat includes a limiting protrusion 1 and a limiting protrusion 2 matching the U-shaped groove, one side of the limiting protrusion 1 is fixedly connected to the mounting plate, the other side corresponding to the limiting protrusion 1 is fixedly connected to the limiting protrusion 2, one side of the isolation sheet is close to the metal spring sheet, the other side corresponding to the isolation sheet is far away from the metal spring sheet, the limiting protrusion 1 is located on the side of the isolation sheet away from the metal spring sheet, and the height of the limiting protrusion 1 is greater than the height of the limiting protrusion 2. The limiting protrusion 1 and the metal spring sheet can limit the two sides of the isolation sheet, and the isolation sheet can move up and down by matching the U-shaped groove with the limiting protrusion 2.

[0016] Preferably, one end of the moving contact is fixedly connected to the bottom of the groove, the other end edge of the moving contact is provided with a guide slope 1 and contacts the second static contact, one end of the second static contact is fixedly connected to the metal sheet, the other end of the second static contact is provided with a guide slope 2 and contacts the moving contact, and both side edges of the avoidance groove 1 are provided with a chamfered edge 1 corresponding to the guide slope 1 and a chamfered edge 2 corresponding to the guide slope 2. This design plays a certain guiding role when the isolation sheet isolates the moving contact and the second static contact, thereby facilitating the automatic disconnection of the circuit.

[0017] The beneficial effects of the present invention are as follows: the operator can connect or disconnect the circuit through the switch body, and when the circuit is overloaded, the protection switch automatically disconnects the circuit by deforming the metal spring inside it, which is convenient to control; the protection switch can connect or disconnect the circuit with the external power supply and equipment respectively at the same time, thereby improving the safety performance; the working principle is simple, the response is fast and sensitive; and the design is reasonable. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the present invention;

[0019] Figure 2 is an exploded view of the present invention;

[0020] Figure 3 It is a schematic diagram of the internal structure of the present invention;

[0021] Figure 4 yes Figure 3 A top view of

[0022] Figure 5 yes Figure 4 Left view of

[0023] Figure 6 yes Figure 4 A top view of

[0024] Figure 7 yes Figure 6 Schematic diagram of the structure after the metal shrapnel is removed;

[0025] Figure 8 It is a schematic diagram of the structure of the metal shrapnel;

[0026] Fig. 9 It is a schematic diagram of the structure of the metal sheet;

[0027] Fig.10 yes Figure 5 Schematic diagram of the structure after removing the base.

[0028] In the figure: 1. Protective shell, 2. Switch body, 3. Pin 1, 4. Pin 2, 5. Metal sheet, 6. Metal spring, 7. Moving contact, 8. Static contact 1, 9. Static contact 2, 10. Ejector, 11. Arc sheet, 12. Rectangular sheet, 13. Groove, 14. Straight edge, 15. Arc edge, 16. Transition arc edge, 17. Switch cap, 18. Flanged edge, 19. Spring 1, 20. Isolation sheet, 21. Spring 2, 22. Limit seat, 23. U-shaped groove, 24. L-shaped notch, 25. Limit plate, 26. Avoidance groove 1, 27. Upper cover, 28. Base, 29. Side cover, 30. Mounting tube, 31. Mounting block, 32. Avoidance groove 2, 33. Avoidance notch, 34. Slot, 35. Buckle, 36. Mounting plate, 37. Elastic sheet, 38. Transition arc surface, 39. L-shaped limiting column, 40. Limiting protrusion 1, 41. Limiting protrusion 2, 42. Guide slope 1, 43. Guide slope 2, 44. Chamfered edge 1, 45. Chamfered edge 2. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] like Figure 1 In the embodiment described, a novel overload protection switch comprises a protection housing 1, a switch body 2, a pin 1 3 and a pin 2 4. The switch body 2 is mounted on the top of the protection housing 1, one end of the switch body 2 is located outside the protection housing 1, and the other end of the switch body 2 is located inside the protection housing 1. Figure 2 As shown, a metal sheet 5 is provided at the bottom of the protective housing 1, and the metal sheet 5, the pin 1 3 and the pin 2 4 are all installed in the protective housing 1. Figure 3 As shown, one end of the pin 1 3 is located between the switch body 2 and the metal sheet 5, and one end of the pin 1 3 is elastically connected to one end of the switch body 2 located in the protective housing 1, as shown in FIG. Figure 4 , Figure 5 and Figure 6 As shown, a metal spring 6 is fixed to one end of the pin 2 4, one end of the metal spring 6 is fixedly connected to the pin 2 4, and a moving contact 7 is provided at the other end of the metal spring 6. Figure 2 and Figure 3As shown, one end of the metal sheet 5 is provided with a stationary contact 8 corresponding to the pin 3. Figure 4 , Figure 5 and Figure 7 As shown, the other end of the metal sheet 5 is provided with a stationary contact 9 in contact with the moving contact 7. Figure 2 and Figure 4 As shown, the protective shell 1 is provided with an ejection device 10, and the ejection device 10 is located between the metal spring sheet 6 and the metal sheet 5. Figure 1 and Figure 2 As shown, the bottom end of the ejection device 10 is elastically connected to the bottom of the protective housing 1 , and the top end of the ejection device 10 passes through the top of the protective housing 1 and is connected to the switch body 2 .

[0031] like Figure 1 As shown, the other end of the pin 1 3 and the other end of the pin 2 4 both penetrate the protective housing 1 and are located outside the protective housing 1, as shown in FIG. Figure 4 and Figure 8 As shown, the metal spring piece 6 includes an arc-shaped piece 11 and a rectangular piece 12, one side of the arc-shaped piece 11 is close to the ejection device 10, and the other side of the arc-shaped piece 11 is away from the ejection device 10, and the arc-shaped piece 11 protrudes toward the side away from the ejection device 10 to form an arc structure, one end of the arc-shaped piece 11 is fixedly connected to the long side of the rectangular piece 12, and is formed as a whole with the rectangular piece 12, one end of the arc-shaped piece 11 is fixedly connected to the pin 2 4 through the rectangular piece 12, and the other end of the arc-shaped piece 11 protrudes toward the side close to the ejection device 10 to form a groove 13, and the arc-shaped piece 11 is fixedly connected to the pin 2 4 through the rectangular piece 12 to the shortest side of the ejection device 10. The distance is greater than the shortest distance from the other end of the arc-shaped sheet 11 to the ejection device 10, the bottom shape of the groove 13 is a plane, the moving contact 7 is fixedly installed on the plane, the long side of the rectangular sheet 12 and the groove 13 are both located on the wide side of the arc-shaped sheet 11, and the width of one end of the arc-shaped sheet 11 fixedly connected to the pin 2 4 through the rectangular sheet 12 is respectively smaller than the width of the other end and the length of the rectangular sheet 12, the long side of the arc-shaped sheet 11 includes a straight side 14 and an arc side 15, one end of the straight side 14 is provided with a transition arc side 16, the straight side 14 is uniformly transitioned to the wide side of the rectangular sheet 12 through the transition arc side 16, and the other end of the straight side 14 is uniformly transitioned to the arc side 15.

[0032] like Figure 1 and Figure 2 As shown, a switch cap 17 is provided at one end of the switch body 2 outside the protective housing 1, and a flange 18 is provided at the edge of the open end of the switch cap 17. The top end of the ejection device 10 penetrates the top of the protective housing 1 and contacts the flange 18. The switch body 2 is fixedly connected to the bottom center of the switch cap 17, and a spring 19 is provided at one end of the switch body 2 inside the protective housing 1. Figure 2 and Figure 3 As shown, the switch body 2 is elastically connected to the pin 3 via a spring 19 .

[0033] like Figure 4 and Figure 7 As shown, the ejection device 10 includes an isolation piece 20 and a spring 21, a limiting seat 22 is provided at the bottom of the protective shell 1, a U-shaped groove 23 matching the limiting seat 22 is provided at the bottom end of the isolation piece 20, an L-shaped notch 24 is provided on one side of the isolation piece 20, the L-shaped notch 24 is located at the bottom end of the isolation piece 20 and at the side of the U-shaped groove 23, one side of the L-shaped notch 24 is perpendicular to the side wall of the U-shaped groove 23, the other side of the L-shaped notch 24 is parallel to the side wall of the U-shaped groove 23, a limiting plate 25 is provided on one side of the L-shaped notch 24 perpendicular to the side wall of the U-shaped groove 23, the limiting plate 25 is located at one end of one side of the L-shaped notch 24, and the other end of one side of the L-shaped notch 24 is connected with the other side thereof, one end of the spring 21 is sleeved on the limiting plate 25, and the other end of the spring 21 contacts the bottom of the protective shell 1, and the other side corresponding to the isolation piece 20 is provided with an avoidance groove 26 matching the moving contact 7 and the static contact 29 respectively, as shown in FIG. Figure 1 , Figure 2 and Figure 7 As shown, the top of one side of the isolation piece 20 with the avoidance groove 26 passes through the top of the protective shell 1 and contacts the flange 18, and the top of one side of the isolation piece 20 with the L-shaped notch 24 passes through the top of the protective shell 1 and is located outside the protective shell 1.

[0034] like Figure 2 As shown, the protective housing 1 includes an upper cover 27, a base 28 and a side cover 29, wherein the base 28 is located at the bottom of the upper cover 27, the side cover 29 is located at the side of the upper cover 27, and the top of the upper cover 27 is fixedly connected with a mounting cylinder 30 matching the switch body 2, and two mounting blocks 31 are provided on the outer side wall of the mounting cylinder 30, wherein one mounting block 31 is located on one side of the mounting cylinder 30, and the other mounting block 31 is located on the other side corresponding to the mounting cylinder 30, as shown in FIG. Figure 1 and Figure 7 As shown, the top of the isolation sheet 20 is provided with a second avoidance groove 32 matching the mounting block 31, the second avoidance groove 32 is located between the L-shaped notch 24 and the first avoidance groove 26, the bottom of the second avoidance groove 32 is located in the protective shell 1, and the mounting block 31 is in contact with the top of the upper cover 27, as shown in FIG. Figure 2 As shown, one side of the bottom of the upper cover 27 is provided with an avoidance notch 33 that matches the pin 1 3, and the other corresponding side of the upper cover 27 is snap-connected with the side cover 29, and the other two sides of the upper cover 27 are provided with a slot 34, and the base 28 is provided with a buckle 35 that matches the slot 34. The base 28 can be detachably installed on the upper cover 27 by matching the buckle 35 with the slot 34.

[0035] like Figure 2 and Figure 4As shown, a mounting plate 36 is provided at the center of the base 28, the pin 1 3 is located on one side of the mounting plate 36, and the limit seat 22, the pin 2 4 and the metal spring 6 are all located on the other side of the mounting plate 36. Figure 2 , Figure 3 and Figure 4 As shown, one end of the pin 3 is detachably mounted on the base 28 and is provided with an elastic sheet 37. One end of the elastic sheet 37 is located between the metal sheet 5 and the switch body 2 and is elastically connected to the switch body 2 through a spring 19. The other end of the elastic sheet 37 is provided with a transition arc surface 38. The elastic sheet 37 is fixedly connected to the pin 3 through the transition arc surface 38 and forms an integral body. The elastic sheet 37 and the pin 3 form an acute angle. The other end of the pin 3 passes through the avoidance notch 33 and is located outside the protective shell 1.

[0036] like Figure 2 , Figure 4 Fig. 9 and Fig.10 As shown, the shape of the metal sheet 5 is L-shaped. The metal sheet 5 is located on the side of the pin 3. One side of the metal sheet 5 is detachably connected to the base 28 and is located on the same side of the mounting plate 36 as the pin 3. The static contact 8 is located on the side of the metal sheet 5 that is detachably connected to the base 28. The static contact 8 is located on one end of one side of the metal sheet 5 and corresponds to the position of the elastic sheet 37. The other end of one side of the metal sheet 5 passes through the mounting plate 36 and is fixedly connected to the other side of the metal sheet 5. The static contact 29 is located on the other side of the metal sheet 5.

[0037] like Figure 2 , Figure 4 , Figure 6 , Figure 7 and Fig.10 As shown, the shape of pin 24 is L-shaped, one side of pin 24 is detachably connected to the base 28, and the other side of pin 24 is fixedly connected to the arc-shaped sheet 11 through the rectangular sheet 12. One end of the side of pin 24 detachably connected to the base 28 passes through the side cover 29 and is located outside the protective shell 1, and the other end is fixedly connected to the other side and forms a whole. An L-shaped limit column 39 is provided on pin 24, one side of the L-shaped limit column 39 is fixedly connected to the side of pin 24, and the other side of the L-shaped limit column 39 is located between the mounting plate 36 and the rectangular sheet 12. The other end of spring 21 is sleeved on the side of the L-shaped limit column 39 located between the mounting plate 36 and the rectangular sheet 12 and contacts the bottom of the protective shell 1.

[0038] like Figure 4 and Figure 7As shown, the limit seat 22 includes a limit protrusion 40 and a limit protrusion 41 matching the U-shaped groove 23, one side of the limit protrusion 40 is fixedly connected to the mounting plate 36, and the other side corresponding to the limit protrusion 40 is fixedly connected to the limit protrusion 41, one side of the isolation plate 20 is close to the metal spring sheet 6, and the other side corresponding to the isolation plate 20 is far away from the metal spring sheet 6, the limit protrusion 40 is located on the side of the isolation plate 20 away from the metal spring sheet 6, and the height of the limit protrusion 40 is greater than the height of the limit protrusion 41.

[0039] like Fig.10 As shown, one end of the moving contact 7 is fixedly connected to the bottom of the groove 13, the other end edge of the moving contact 7 is provided with a guide bevel 1 42 and is in contact with the static contact 2 9, one end of the static contact 2 9 is fixedly connected to the metal sheet 5, the other end of the static contact 2 9 is provided with a guide bevel 2 43 and is in contact with the moving contact 7, and both side edges of the avoidance groove 26 are provided with a chamfered edge 1 44 corresponding to the guide bevel 1 42 and a chamfered edge 2 45 corresponding to the guide bevel 2 43 respectively.

[0040] Pin 1 3 is mainly used for electrical connection with the device, and pin 2 4 is mainly used for electrical connection with the external power supply; the operator presses the switch cap 17, and the switch body 2 drives the elastic sheet 37 on the pin 1 3 to move downward, and the elastic sheet 37 contacts the static contact 1 8 on the metal sheet 5. At the same time, the switch cap 17 acts on the top of the isolation sheet 20 through the flange 18 to move the isolation sheet 20 downward, and the moving contact 7 on the metal spring sheet 6 contacts the static contact 2 9 on the metal sheet 5 through the avoidance groove 1 26, thereby realizing the conduction of the protection switch with the device and the external power supply circuit respectively.

[0041] On the contrary, when it is necessary to disconnect the circuit, the operator presses the switch cap 17 again, the switch body 2 drives the elastic sheet 37 to spring up, and the elastic sheet 37 is separated from the static contact 8 on the metal sheet 5. At the same time, the isolation sheet 20 moves up under the resetting action of the spring 21, and isolates the moving contact 7 on the metal spring sheet 6 from the static contact 9 on the metal sheet 5, thereby realizing that the protection switch can be disconnected from the equipment and the external power circuit respectively at the same time.

[0042] When the circuit is overloaded, the metal spring 6 is deformed, so that the moving contact 7 on the metal spring 6 is automatically separated from the static contact 9 on the metal sheet 5. At the same time, the isolation sheet 20 moves upward under the resetting action of the spring 21 and isolates the moving contact 7 and the static contact 9. The top of the isolation sheet 20 acts on the switch cap 17 through the flange 18, so that the switch cap 17 drives the switch body 2 to move upward at the same time, thereby separating the elastic sheet 37 on the pin 3 and the static contact 8, so that the protection switch can disconnect the current from the external power supply and the device respectively at the same time, so as to protect the device and the external power supply from damage, thereby achieving the purpose of automatically disconnecting the circuit.

Claims

1. A new type of overload protection switch, Its characteristics are: The switch body (2) comprises a protective housing (1), a switch body (2), a pin 1 (3) and a pin 2 (4), wherein the switch body (2) is mounted on the top of the protective housing (1), one end of the switch body (2) is located outside the protective housing (1), and the other end of the switch body (2) is located inside the protective housing (1); a metal sheet (5) is provided at the bottom of the protective housing (1); the metal sheet (5), the pin 1 (3) and the pin 2 (4) are all mounted inside the protective housing (1); one end of the pin 1 (3) is located between the switch body (2) and the metal sheet (5); one end of the pin 1 (3) is elastically connected to one end of the switch body (2) located inside the protective housing (1); the other end of the pin 1 (3) passes through the protective housing (1) and is located outside the protective housing (1); one end of the pin 2 (4) is A metal spring (6) is provided, one end of the metal spring (6) is fixedly connected to the second pin (4), the other end of the metal spring (6) is provided with a moving contact (7), the other end of the second pin (4) passes through the protective shell (1) and is located outside the protective shell (1), one end of the metal sheet (5) is provided with a stationary contact (8) corresponding to the first pin (3), the other end of the metal sheet (5) is provided with a stationary contact (9) in contact with the moving contact (7), an ejection device (10) is provided in the protective shell (1), the ejection device (10) is located between the metal spring (6) and the metal sheet (5), the bottom end of the ejection device (10) is elastically connected to the bottom of the protective shell (1), and the top end of the ejection device (10) passes through the top of the protective shell (1) and is connected to the switch body (2);The other end of the pin one (3) and the other end of the pin two (4) both pass through the protective shell (1) and are located outside the protective shell (1); the metal spring sheet (6) comprises an arc-shaped sheet (11) and a rectangular sheet (12); one side of the arc-shaped sheet (11) is close to the ejection device (10), and the other side of the arc-shaped sheet (11) is away from the ejection device (10); the arc-shaped sheet (11) protrudes toward the side away from the ejection device (10) to form an arc-shaped structure; one end of the arc-shaped sheet (11) is fixedly connected to the long side of the rectangular sheet (12) and forms an integral body with the rectangular sheet (12); one end of the arc-shaped sheet (11) is fixedly connected to the pin two (4) through the rectangular sheet (12); the other end of the arc-shaped sheet (11) protrudes toward the side close to the ejection device (10) to form a groove (13); the arc-shaped sheet (11) is connected to the pin two (4) through the rectangular sheet (12); The shortest distance from one end of the second (4) fixedly connected to the ejection device (10) is greater than the shortest distance from the other end of the arc-shaped sheet (11) to the ejection device (10); the bottom shape of the groove (13) is a plane; the moving contact (7) is fixedly mounted on the plane; the long side of the rectangular sheet (12) and the groove (13) are both located on the wide side of the arc-shaped sheet (11); the width of one end of the arc-shaped sheet (11) fixedly connected to the second pin (4) through the rectangular sheet (12) is smaller than the width of the other end and the length of the rectangular sheet (12); the long side of the arc-shaped sheet (11) includes a straight side (14) and an arc-shaped side (15); one end of the straight side (14) is provided with a transition arc-shaped side (16); the straight side (14) is uniformly transitioned to the wide side of the rectangular sheet (12) through the transition arc-shaped side (16); and the other end of the straight side (14) is uniformly transitioned to the arc-shaped side (15). ; 2. A novel overload protection switch according to claim 1, Its characteristics are: A switch cap (17) is provided at one end of the switch body (2) located outside the protective shell (1); a flange (18) is provided at the edge of the open end of the switch cap (17); the top end of the ejection device (10) penetrates the top of the protective shell (1) and contacts the flange (18); the switch body (2) is fixedly connected to the bottom center of the switch cap (17); a spring 1 (19) is provided at one end of the switch body (2) located inside the protective shell (1); and the switch body (2) is elastically connected to the pin 1 (3) via the spring 1 (19).

3. A new overload protection switch according to claim 2, Its characteristics are: The ejection device (10) comprises an isolation plate (20) and a second spring (21); a limit seat (22) is provided at the bottom of the protective shell (1); a U-shaped groove (23) matching the limit seat (22) is provided at the bottom end of the isolation plate (20); an L-shaped notch (24) is provided on one side of the isolation plate (20); the L-shaped notch (24) is located at the bottom end of the isolation plate (20) and at the side of the U-shaped groove (23); one side of the L-shaped notch (24) is perpendicular to the side wall of the U-shaped groove (23); and the other side of the L-shaped notch (24) is parallel to the U-shaped groove (23). 3), a limiting plate (25) is provided on one side of the L-shaped notch (24) perpendicular to the side wall of the U-shaped groove (23), the limiting plate (25) is located at one end of one side of the L-shaped notch (24), and the other end of one side of the L-shaped notch (24) is connected with the other side thereof, one end of the spring (21) is sleeved on the limiting plate (25), and the other end of the spring (21) is in contact with the bottom of the protective shell (1), and the other side corresponding to the isolation sheet (20) is provided with an avoidance groove (26) matching the moving contact (7) and the static contact (9) respectively, the top of one side of the isolation sheet (20) provided with the avoidance groove (26) passes through the top of the protective shell (1) and contacts the flange (18), and the top of one side of the isolation sheet (20) provided with the L-shaped notch (24) passes through the top of the protective shell (1) and is located outside the protective shell (1).

4. A new overload protection switch according to claim 3, Its characteristics are: The protective housing (1) comprises an upper cover (27), a base (28) and a side cover (29), wherein the base (28) is located at the bottom of the upper cover (27), and the side cover (29) is located at the side of the upper cover (27); a mounting cylinder (30) matching the switch body (2) is fixedly connected to the top of the upper cover (27); two mounting blocks (31) are provided on the outer side wall of the mounting cylinder (30), wherein one mounting block (31) is located on one side of the mounting cylinder (30), and the other mounting block (31) is located on the other side corresponding to the mounting cylinder (30); a second avoidance groove (32) matching the mounting block (31) is provided at the top of the isolation sheet (20), and the avoidance groove The second (32) is located between the L-shaped notch (24) and the avoidance groove one (26), the bottom of the avoidance groove two (32) is located in the protective shell (1), the mounting block (31) is in contact with the top of the upper cover (27), one side of the bottom of the upper cover (27) is provided with an avoidance notch (33) matching the pin one (3), the other side corresponding to the upper cover (27) is snap-connected with the side cover (29), the remaining two sides of the upper cover (27) are both provided with a snap groove (34), the base (28) is provided with a snap buckle (35) matching the snap groove (34), and the base (28) is detachably mounted on the upper cover (27) by the snap buckle (35) matching the snap groove (34).

5. A novel overload protection switch according to claim 4, Its characteristics are: A mounting plate (36) is provided at the center of the base (28); the pin 1 (3) is located on one side of the mounting plate (36); the limit seat (22), the pin 2 (4) and the metal spring (6) are all located on the other side of the mounting plate (36); one end of the pin 1 (3) is detachably mounted on the base (28) and is provided with an elastic sheet (37); one end of the elastic sheet (37) is located between the metal sheet (5) and the switch body (2) and is elastically connected to the switch body (2) via a spring 1 (19); the other end of the elastic sheet (37) is provided with a transition arc surface (38); the elastic sheet (37) is fixedly connected to the pin 1 (3) via the transition arc surface (38) and forms an integral body; the elastic sheet (37) and the pin 1 (3) form an acute angle; the other end of the pin 1 (3) passes through the avoidance notch (33) and is located outside the protective housing (1).

6. A novel overload protection switch according to claim 5, Its characteristics are: The metal sheet (5) is in an L-shape. The metal sheet (5) is located on the side of the pin one (3). One side of the metal sheet (5) is detachably connected to the base (28) and is located on the same side of the mounting plate (36) as the pin one (3). The static contact one (8) is located on the side of the metal sheet (5) detachably connected to the base (28). The static contact one (8) is located on one end of one side of the metal sheet (5) and corresponds to the position of the elastic sheet (37). The other end of one side of the metal sheet (5) passes through the mounting plate (36) and is fixedly connected to the other side of the metal sheet (5). The static contact two (9) is located on the other side of the metal sheet (5).

7. A novel overload protection switch according to claim 6, Its characteristics are: The pin 2 (4) is in an L-shape, one side of the pin 2 (4) is detachably connected to the base (28), and the other side of the pin 2 (4) is fixedly connected to the arc-shaped sheet (11) through a rectangular sheet (12). One end of the side of the pin 2 (4) detachably connected to the base (28) passes through the side cover (29) and is located outside the protective shell (1), and the other end is fixedly connected to the other side and forms an integral body. An L-shaped limiting column (39) is provided on the pin 2 (4), one side of the L-shaped limiting column (39) is fixedly connected to the side of the pin 2 (4), and the other side of the L-shaped limiting column (39) is located between the mounting plate (36) and the rectangular sheet (12). The other end of the spring 2 (21) is sleeved on one side of the L-shaped limiting column (39) located between the mounting plate (36) and the rectangular sheet (12) and contacts the bottom of the protective shell (1).

8. A novel overload protection switch according to claim 5, Its characteristics are: The limiting seat (22) comprises a limiting protrusion 1 (40) and a limiting protrusion 2 (41) matching the U-shaped groove (23); one side of the limiting protrusion 1 (40) is fixedly connected to the mounting plate (36); the other side corresponding to the limiting protrusion 1 (40) is fixedly connected to the limiting protrusion 2 (41); one side of the isolation plate (20) is close to the metal spring sheet (6); the other side corresponding to the isolation plate (20) is far away from the metal spring sheet (6); the limiting protrusion 1 (40) is located on the side of the isolation plate (20) far away from the metal spring sheet (6); and the height of the limiting protrusion 1 (40) is greater than the height of the limiting protrusion 2 (41).

9. A novel overload protection switch according to claim 3, Its characteristics are: One end of the moving contact (7) is fixedly connected to the bottom of the groove (13), the other end edge of the moving contact (7) is provided with a guide slope 1 (42) and is in contact with the second stationary contact (9), one end of the second stationary contact (9) is fixedly connected to the metal sheet (5), the other end of the second stationary contact (9) is provided with a guide slope 2 (43) and is in contact with the moving contact (7), and both side edges of the avoidance groove 1 (26) are provided with a chamfered edge 1 (44) corresponding to the guide slope 1 (42) and a chamfered edge 2 (45) corresponding to the guide slope 2 (43), respectively.

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