Large-current button switch

Abstract

The utility model provides a heavy current button switch, which comprises a switch shell and a first contact assembly arranged in the switch shell, the first contact assembly comprises a moving contact and a static contact, the moving contact is rotatably arranged on a contact frame, the heavy current button switch also comprises a heat dissipation plate connected with the contact frame, and the heat dissipation plate is provided with a heat dissipation part exposed outside the switch shell. Therefore, heat on the moving contact can be transmitted to the outside through the heat dissipation plate, so that temperature rise is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of switches, in particular to a high-current push button switch. Background Art

[0002] Push button switches are widely used in the field of handheld power tools, such as electric drills, electric grinders, electric wrenches and electric screwdrivers.

[0003] Existing push button switches are generally suitable for small load currents of about 20A. When the load current is large (generally above 60A), the temperature rise on the moving contact and the static contact is high, which will shorten the service life of the product. Utility Model Content

[0004] Therefore, the technical problem to be solved by the utility model is to overcome the defects of high temperature rise and short service life of the high current push button switch in the prior art, thereby providing a high current push button switch with low temperature rise and long service life.

[0005] To this end, the utility model provides a high-current push button switch, including a switch housing, and a first contact assembly arranged in the switch housing, the first contact assembly including a moving contact and a stationary contact, the moving contact being rotatably mounted on a contact frame, and also including a heat sink connected to the contact frame, the heat sink having a heat dissipation portion exposed to the outside of the switch housing.

[0006] A heat conducting layer is provided between the heat dissipation plate and the contact frame.

[0007] The contact frame includes a first bent plate and a second bent plate of a U-shaped structure, the first vertical plate portion of the first bent plate being movably mounted with the moving contact, the second bent plate having a transverse plate portion and a second vertical plate portion disposed on both sides of the transverse plate portion, the second vertical plate portion being disposed in contact with a surface of the first vertical plate portion away from the moving contact, and a heat conductive layer being disposed between the transverse plate portion and the contact frame.

[0008] A circuit board is arranged in the switch housing, and the transverse plate portion is arranged parallel to the circuit board.

[0009] A plug-in structure is provided between the heat sink and the switch housing. The plug-in structure comprises a slot provided on the switch housing and an insert block provided on the heat sink and adapted to be plugged with the slot.

[0010] The side edge of the insert block is provided with inverted teeth for preventing reverse movement.

[0011] The heat-conducting layer is heat-conducting silica gel or heat-conducting resin.

[0012] The switch housing is also provided with a second contact assembly, which is arranged in parallel with the first contact assembly and is used to control the on and off of the push button switch.

[0013] The switch housing is provided with a button, a movable bracket and a circuit board, the movable bracket is driven by the button, and the second contact assembly includes a spring sheet provided on the movable bracket, and a conductive layer provided on the circuit board and capable of contacting and abutting against the spring sheet.

[0014] The technical solution of the utility model has the following advantages:

[0015] 1. The high-current push button switch provided by the utility model is provided with a heat sink, and the heat sink has a heat dissipation portion exposed outside the switch housing. Since the heat sink is connected to the contact frame, the heat on the moving contact can be transferred to the outside through the contact frame and the heat sink, thereby reducing the temperature rise and extending the service life.

[0016] 2. In the high-current push button switch provided by the utility model, a heat-conducting layer is provided between the heat sink and the contact frame, and the heat-conducting layer can increase the contact area between the contact frame and the heat sink, and can conduct heat more effectively.

[0017] 3. The high-current push button switch provided by the utility model has a plug-in structure between the heat sink and the switch housing. The plug-in structure includes a slot provided on the switch housing, and an insert block provided on the heat sink and adapted to be plugged into the slot. The side of the insert block is provided with inverted teeth for preventing reverse movement, so that the assembly between the heat sink and the switch housing is more secure.

[0018] 4. The high-current push button switch provided by the utility model also has a second contact assembly on the switch housing. The second contact assembly is arranged in parallel with the first contact assembly and both are used to control the on and off of the push button switch. In this way, even if one of the contact assemblies fails, it will not affect the normal operation of the switch. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is the front view of the high current push button switch of the utility model after removing the circuit board;

[0021] Figure 2 This is the rear view of the high current push button switch;

[0022] Figure 3 It is a schematic diagram of the assembly of the contact frame, the moving contact, the stationary contact and the circuit board;

[0023] Figure 4 It is a schematic diagram of the exploded structure of the contact frame, moving contact, static contact and circuit board.

[0024] Explanation of the accompanying drawings: 1. switch housing; 2. moving contact; 3. static contact; 4. contact frame; 5. heat sink; 6. heat dissipation part; 7. heat conducting layer; 8. plug-in block; 9. inverted tooth; 10. button; 11. movable bracket; 12. circuit board; 13. spring piece; 41. first bent plate; 42. second bent plate; 43. first vertical plate part; 44. horizontal plate part; 45. second vertical plate part. DETAILED DESCRIPTION

[0025] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] Example

[0030] This embodiment provides a high current push button switch, such as Figure 1 and Figure 2 As shown, it includes a switch housing 1 , a first contact assembly, a second contact assembly and a heat sink 5 .

[0031] The switch housing 1 is provided with a button 10 , a movable bracket 11 and a circuit board 12 , and the movable bracket 11 is driven by the button 10 .

[0032] The first contact assembly is arranged in the switch housing 1 and is used to control the switch on and off. It includes a moving contact 2 and a stationary contact 3. The moving contact 2 is rotatably mounted on a contact frame 4. Figure 3 and Figure 4 As shown, the contact frame 4 includes a first curved plate 41 and a second curved plate 42 of a U-shaped structure, the first vertical plate portion 43 of the first curved plate 41 is movably mounted with the moving contact 2, the second curved plate 42 has a horizontal plate portion 44, and second vertical plate portions 45 arranged on both sides of the horizontal plate portion 44, the second vertical plate portion 45 is arranged in contact with a side of the first vertical plate portion 43 away from the moving contact 2, a heat conducting layer 7 is arranged between the horizontal plate portion 44 and the contact frame 4, in this embodiment, a circuit board 12 is arranged in the switch housing 1, and the horizontal plate portion 44 is arranged parallel to the circuit board 12, so that the heat dissipation area of ​​the horizontal plate portion 44 can be set to be larger, which is conducive to heat dissipation. It should be noted that the mounting structure between the first vertical plate portion 43 and the moving contact 2 is an existing mature technology, so it will not be described in detail.

[0033] The heat sink 5 is connected to the static contact plate 4 and has a heat sink 6 exposed outside the switch housing 1. Figure 3 and Figure 4 As shown, a heat-conducting layer 7 is provided between the heat dissipation plate 5 and the static contact plate 4, and the heat-conducting layer 7 is heat-conducting silica gel or heat-conducting resin. A plug-in structure is provided between the heat dissipation plate 5 and the switch housing 1, and the plug-in structure includes a slot provided on the switch housing 1, and an insert block 8 provided on the heat dissipation plate 5 and adapted to be plugged with the slot, and the side of the insert block 8 is provided with a reverse tooth 9 for preventing reverse movement.

[0034] The second contact assembly is arranged in the switch housing 1 and is used to control the on and off of the push button switch. The second contact assembly is arranged in parallel with the first contact assembly. Figure 1 As shown, the second contact assembly includes a spring 13 provided on the movable bracket 11, and a conductive layer provided on the circuit board 12 and capable of contacting and abutting against the spring 13. It should be noted that those skilled in the art will understand the specific wiring method of the first contact assembly and the second contact assembly to achieve parallel connection of the two, and those skilled in the art will understand the specific structure of the conductive layer and can make adaptive modifications as long as the spring 13 can achieve contact and connection or separation and disconnection with the conductive layer.

[0035] The high-current push button switch provided by the utility model is provided with a heat sink 5, and the heat sink 5 has a heat dissipation portion 6 exposed outside the switch housing 1. Since the heat sink 6 is connected to the contact frame 4, the heat on the contact frame 4 can be transferred to the outside through the heat sink 6, thereby reducing the temperature rise and extending the service life.

[0036] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention of the utility model.

Claims

1. A high current push button switch, comprising a switch housing (1), and a first contact assembly arranged in the switch housing (1), the first contact assembly comprising a moving contact (2) and a stationary contact (3), the moving contact (2) being rotatably mounted on a contact frame (4), characterized in that: It also comprises a heat dissipation plate (5) connected to the contact frame (4), wherein the heat dissipation plate (5) has a heat dissipation portion (6) exposed outside the switch housing (1).

2. The high current push button switch according to claim 1, characterized in that: A heat conducting layer (7) is provided between the heat dissipation plate (5) and the contact frame (4).

3. The high current push button switch according to claim 2, characterized in that: The contact frame (4) comprises a first bent plate (41) and a second bent plate (42) of a U-shaped structure, the first vertical plate portion (43) of the first bent plate (41) being movably mounted with the moving contact (2), the second bent plate (42) comprising a transverse plate portion (44) and second vertical plate portions (45) arranged on both sides of the transverse plate portion (44), the second vertical plate portion (45) being arranged in contact with a surface of the first vertical plate portion (43) away from the moving contact (2), and a heat conducting layer (7) being arranged between the transverse plate portion (44) and the contact frame (4).

4. The high current push button switch according to claim 3, characterized in that: A circuit board (12) is arranged in the switch housing (1), and the transverse plate portion (44) is arranged parallel to the circuit board (12).

5. The high current push button switch according to any one of claims 1 to 4, characterized in that: A plug-in structure is provided between the heat sink (5) and the switch housing (1), the plug-in structure comprising a slot provided on the switch housing (1), and an insert block (8) provided on the heat sink (5) and adapted to be plugged into the slot.

6. The high current push button switch according to claim 5, characterized in that: The side edge of the insert block (8) is provided with inverted teeth (9) for preventing reverse movement.

7. The high current push button switch according to claim 2, characterized in that: The heat-conducting layer (7) is heat-conducting silica gel or heat-conducting resin.

8. The high current push button switch according to claim 1, characterized in that: The switch housing (1) is also provided with a second contact assembly, which is arranged in parallel with the first contact assembly and is used to control the on and off of the push button switch.

9. The high current push button switch according to claim 8, characterized in that: The switch housing (1) is provided with a button (10), a movable bracket (11) and a circuit board (12); the movable bracket (11) is driven by the button (10); and the second contact assembly comprises a spring sheet (13) provided on the movable bracket (11), and a conductive layer provided on the circuit board (12) and capable of contacting and abutting against the spring sheet (13).

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