Overload protection switch

Abstract

The invention discloses an overload protection switch which comprises a shell, a static terminal and a movable terminal, the static terminal and the movable terminal are arranged on the shell, the static terminal and the movable terminal are in contact through a bimetallic strip, and the static terminal and the movable terminal are in contact through contacts of the static terminal and the movable terminal. The static terminal and the moving terminal are connected or disconnected through deformation of the sheet body of the bimetallic sheet, and the middle part of the sheet body of the bimetallic sheet is fixed on the static terminal. According to the invention, the static terminal is fixed at the middle part of the bimetallic strip, so that the design is reasonable, the on-off effect is better on the basis of keeping the structure simple, the overload protection effect is better, and the use requirements can be better met.

Description

Technical Field

[0001] The invention relates to the technical field of overload protection switches, and in particular to an overload protection switch. Background Art

[0002] It is known that an overload protection switch is one of the commonly used and necessary equipment for electrical equipment. For example, the key overload protection switch disclosed in the Chinese invention patent with authorization announcement number CN215266009U includes: a pressing shell, an indicator light circuit component and an overload protection button switch; the indicator light circuit component includes: a PCB indicator light circuit and a reset conductive spring; the PCB indicator light circuit is fixed in the pressing shell, and the PCB indicator light circuit is provided with a first power connector and a second power connector; the reset conductive spring is provided between the PCB indicator light circuit and the overload protection button switch, and the first end of the reset conductive spring abuts on the first power connector, and the second end of the reset conductive spring abuts on the overload protection button switch; the reset conductive spring is provided with a conductive extension portion, and the conductive extension portion is embedded in the shell of the overload protection button switch and abuts on its conductive contact piece.

[0003] The existing push-button overload protection switch can greatly improve the assembly efficiency. However, the existing static terminal is set on the side of the bimetallic strip. Although the connection and conduction effect can be achieved, the mode is relatively single, and the effect is not very good (on and off) during use, which makes the overload protection effect not very good and cannot meet the use requirements. Improvements are urgently needed. Summary of the invention

[0004] 1. Technical issues that need to be resolved

[0005] In view of the deficiencies in the prior art, the present invention provides an overload protection switch, whose static terminal is fixed at the middle part of the bimetallic strip. This not only makes the design reasonable while maintaining a simple structure, but also makes the switching effect better and has a better overload protection effect, and is more able to meet usage requirements.

[0006] 2. Technical issues that need to be resolved

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] An overload protection switch comprises a housing and a static terminal and a dynamic terminal arranged on the housing, wherein the static terminal and the dynamic terminal are in contact with each other through a bimetallic strip, and the static terminal and the dynamic terminal are in contact with each other through contacts on both sides, and the static terminal and the dynamic terminal are connected or disconnected by deformation of the bimetallic strip, the middle of the bimetallic strip is fixed on the static terminal, and contacts are arranged on the edges of the bimetallic strip.

[0009] Preferably, the bimetallic strip comprises a sheet body and a bimetallic strip contact arranged in the middle of the sheet body, the bimetallic strip contact can be connected with the moving terminal, and a connection point is arranged in the middle of the sheet body, and the connection point is connected with the static terminal.

[0010] Preferably, the sheet-shaped body is circular, elliptical or polygonal.

[0011] Preferably, the polygon may be a quadrilateral, a hexagon, or an octagon.

[0012] Preferably, the moving terminal includes a body and a moving terminal contact arranged on the body, the moving terminal contact is located above the bimetal contact, and under normal conditions, the moving terminal contact and the bimetal contact are in a connected state, and under an overload state, the moving terminal contact and the bimetal contact are in a disconnected state.

[0013] Preferably, a button device is provided on the shell for restoring the static terminal to a state of connection with the moving terminal, and the button device includes a fixed bracket arranged on the shell, a button is arranged on the fixed bracket, and a main restoring part and a secondary restoring part are arranged on the fixed bracket. The main restoring part and the secondary restoring part are normally located above the moving terminal.

[0014] Preferably, the main restoration component includes an upper gear arranged below the fixed bracket, the upper gear is matched with a lower gear, a return spring is arranged inside the lower gear, and the lower gear extends into the interior of the shell.

[0015] The housing is provided with mounting holes through which the upper gear and the lower gear can pass.

[0016] The auxiliary reset member includes a compression spring fixed at a position below the fixed bracket, and the compression spring extends to a position above the movable terminal inside the shell. Correspondingly, a matching hole for the compression spring to pass through is provided on the shell.

[0017] A main rod for mounting the main restoration member and a secondary rod for mounting the secondary restoration member are arranged on the lower surface of the fixing bracket.

[0018] Preferably, it also includes a lamp board arranged on the fixing bracket, the lamp board is provided with an LED lamp, and a zero terminal arranged on the shell, the zero terminal and the lamp board are connected via a zero terminal spring.

[0019] Preferably, a mounting column for mounting the zero terminal is provided on the housing.

[0020] Preferably, the lower surface of the fixed bracket is provided with reset rods distributed in pairs, and the reset rods distributed in pairs are located on the lower surface of one side of the fixed bracket. The reset rods distributed in pairs press the bimetallic strip during the downward movement, and the shell is provided with a reset protrusion for resetting the bimetallic strip, and the reset protrusion corresponds to one side of the bimetallic strip.

[0021] Preferably, the shell includes a base and a base assembled on the base, the base is provided with a limit rod for the fixed bracket to move back and forth, each side of the fixed bracket has a sliding hole for the limit rod to slide up and down, the limit rod is provided with an anti-slip block, and the fixed bracket can slide back and forth on the limit rod below the anti-slip block.

[0022] (III) Technical effects to be achieved

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] Firstly, the static terminal of the present invention is fixed in the middle position of the bimetallic strip. This unique design not only makes the design reasonable, but also makes the switching effect better while maintaining the simple structure, and has a better overload protection effect, which can better meet the use requirements.

[0025] Secondly, the static terminal and the moving terminal of the present invention are in contact with each other through a bimetallic strip, and the connection or disconnection of the static terminal and the moving terminal is achieved through the deformation of the bimetallic strip. A button device is provided on the shell to restore the moving terminal to a state of connection with the bimetallic strip. This is conducive to manual recovery, more conducive to manual operation, and improves the convenience of use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the main viewing direction of the present invention.

[0027] Figure 2 It is a schematic diagram of the structure of the present invention.

[0028] Figure 3 It is a schematic diagram of the overall structure of the present invention.

[0029] Figure 4 It is a schematic diagram of the decomposition of the present invention.

[0030] Figure 5 This is a schematic diagram of an embodiment in which the bimetallic strip of the present invention is a quadrilateral.

[0031] Figure 6 This is a schematic diagram of an embodiment in which the bimetallic strip of the present invention is hexagonal.

[0032] Figure 7This is a schematic diagram of an embodiment in which the bimetallic strip of the present invention is an octagon.

[0033] Figure 8 This is a schematic diagram of the decomposition of the first embodiment of the present invention.

[0034] Fig. 9 This is a schematic diagram of the decomposition of the second embodiment of the present invention.

[0035] Fig.10 This is a schematic diagram of the decomposition of embodiment 3 of the present invention.

[0036] Fig.11 This is a schematic diagram of the coordination between the fixing bracket and the button in the third embodiment of the present invention.

[0037] Fig.12 Schematic diagram of the reset protrusion on the shell in the third embodiment of the present invention.

[0038] In the figure: 1, shell; 2, static terminal; 3. Moving terminal; 4, bimetallic strip; 5, button device; 11, base; 12, pedestal; 13, limit rod; 31, main body; 32, moving terminal contact; 41, sheet body; 42, bimetallic strip contact; 43, connection point; 51, fixing bracket; 52, button; 53, main restoration part; 54, auxiliary restoration part; 55, lamp board; 56, zero terminal; 57, zero terminal spring; 131, anti-dropping block; 511, main rod; 512, auxiliary rod; 513, reset rod; 514, reset protrusion; 531, upper gear; 532, lower gear; 533, reset spring; 541, compression spring. DETAILED DESCRIPTION

[0039] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0040] In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the invention product is usually placed when in use, 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", "third" and the like are only used to distinguish descriptions, and cannot be understood as indicating or implying relative importance. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0043] Example 1: See Figure 1 , Figure 2 , Figure 3 and Figure 4, an overload protection switch, including a shell 1 and a static terminal 2 and a dynamic terminal 3 arranged on the shell 1, the static terminal 2 and the dynamic terminal 3 are in contact with each other through a bimetallic strip 4, and the static terminal 2 and the dynamic terminal 3 are in contact with each other through the contacts of both sides, and the static terminal 2 and the dynamic terminal 3 are connected or disconnected by the deformation of the bimetallic strip 4, the middle part of the bimetallic strip 4 is fixed on the static terminal 2, and the 2 static terminals are fixed on the middle part of the 4 bimetallic strips, which not only makes the design reasonable, but also makes the switching effect better while maintaining the simplicity of the structure, has a better overload protection effect, and can better meet the use requirements, and the edge of the bimetallic strip 4 is provided with contacts.

[0044] Embodiment 2: It can be explained on the basis of embodiment 1, such as Figure 4 As shown, the bimetallic strip 4 includes a sheet body 41 and a bimetallic strip contact 42 arranged at the side of the sheet body 41. The bimetallic strip contact 42 can be connected to the moving terminal 3, and a connection point 43 is arranged in the middle of the sheet body 41. The connection point 43 is connected to the static terminal 2. This sheet body 41 can be consistent with the sheet body of the bimetallic strip 4 in the first embodiment. In this embodiment, the connection point 43 adopts a rivet nail, and the static terminal 2 is connected to the bimetallic strip contact 42 by the rivet nail. This method is convenient to connect and easy to implement, and also makes the connection method between the bimetallic strip 4 and the static terminal 2 simple, easy to produce and manufacture, and reduces the production cost. Figure 8 and Fig. 9 As shown, it is to be noted that the sheet body 41 is circular or polygonal. This arrangement not only makes the types diverse and provides people with a large choice, but also makes the concentration point of the force more concentrated, which is more conducive to the connection and disconnection ability of the bimetallic strip 4 and the movable terminal 3, has better overload capacity, and is safer and more reliable to use. It is also to be noted that if Figure 5 , Figure 6 and Figure 7 As shown, the polygon can be a quadrilateral, a hexagon, or an octagon, and there are various types to provide a wide range of choices.

[0045] like Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 and Fig. 9 As shown, the moving terminal 3 includes a body 31 and a moving terminal contact 32 arranged on the body 31, and the moving terminal contact 32 is located above the bimetal contact 42. Under normal conditions, the moving terminal contact 32 and the bimetal contact 42 are in a connected state, and under an overload state, due to the deformation of the bimetal 4, the moving terminal contact 32 and the bimetal contact 42 are in a disconnected state, thereby realizing overload disconnection protection.

[0046] Embodiment 3: It can be described on the basis of Embodiment 1 or Embodiment 2, such as Figure 8 and Fig. 9 As shown, a button device 5 for restoring the static terminal 2 to a state of connection with the moving terminal 3 is provided on the housing 1, and the button device 5 includes a fixed bracket 51 provided on the housing 1, and a button 52 is provided on the fixed bracket 51. A main restoration member 53 and a secondary restoration member 54 are provided on the fixed bracket 51. The main restoration member 53 and the secondary restoration member 54 are both located above the moving terminal 3 under normal conditions. When the button 52 is subjected to an external force, the button 52 drives the main restoration member 53 to move downward, and then can press the moving terminal 3 downward, so that the moving terminal 3 is reconnected with the bimetallic strip 4, and finally the static terminal 2 and the moving terminal 3 are connected again. When the external force of the button 52 is removed, the fixed bracket 51 is restored to its original state under the drive of the main restoration member 53.

[0047] Among them, Figure 8 and Fig. 9 As shown, the main restoration member 53 includes an upper gear 531 arranged below the fixed bracket 51, a lower gear 532 is matched on the upper gear 531, a reset spring 533 is arranged inside the lower gear 532, and the lower gear 532 extends to the inside of the housing 1, and is located above the moving terminal 3 under normal conditions, which is conducive to the fixed bracket 51 when subjected to a downward force, thereby pressing the moving terminal 3 to move downward. This button 52 can realize its overload function and play a protective function under the pressure of external force, thereby protecting the safety of the electrical appliance. It is also worth noting that the housing 1 is provided with a mounting hole for the upper gear 531 and the lower gear 532 to pass through. The auxiliary reset member 54 includes a compression spring 541 fixed at a position below the fixed bracket 51, and the compression spring 541 extends to a position above the moving terminal 3 inside the housing 1. Correspondingly, the housing 1 is provided with a matching hole for the compression spring 541 to pass through.

[0048] The present invention has two modes of use:

[0049] Automatic cycle reset function: This is through the thermal expansion and contraction effect of the bimetallic strip 4. When the bimetallic strip 4 is overloaded, it will expand due to the heat, causing the moving terminal contact 32 and the bimetallic contact 42 to be in a disconnected state. Then, after returning to normal (without overload), the bimetallic strip 4 cools and resets, so that the moving terminal contact 32 and the bimetallic contact 42 are in a connected state. This cycle repeats, thereby achieving an automatic reset effect.

[0050] Manual reset function: In an overload situation, when the bimetal strip 4 is overloaded, it will expand due to heat, causing the moving terminal contact 32 and the bimetal strip contact 42 to be in a disconnected state. Then, by pressing down the button device 5, the moving terminal 3 and the bimetal strip 4 are manually connected, and the static terminal 2 and the moving terminal 3 can also be in contact, so that manual reset is possible.

[0051] Embodiment 4: It can be explained on the basis of embodiment 3, such as Figure 8 and Fig. 9 As shown, further, the lower surface of the fixed bracket 51 is provided with a main rod 511 for the main restoration part 53 to be installed and a secondary rod 512 for the secondary restoration part 54 to be installed, which makes it have a better effect of manually pressing to restore the original state, and also has a better positioning and installation effect. It is to be noted that the number of the secondary rods 512 and the secondary rods 512 can be determined according to the actual situation. When the button 52 is subjected to external force, the button 52 drives the fixed bracket 51, the main restoration part 53 and the secondary restoration part 54 to move downward so that the moving terminal 3 is reconnected with the bimetallic strip 4, and when the external force of the button 52 is removed, the fixed bracket 51 is driven by the main restoration part 53 and the secondary restoration part 54 to restore to its original state.

[0052] The present invention has two modes of use:

[0053] Automatic cycle reset function: This is through the thermal expansion and contraction effect of the bimetallic strip 4. When the bimetallic strip 4 is overloaded, it will expand due to the heat, causing the moving terminal contact 32 and the bimetallic contact 42 to be in a disconnected state. Then, after normal operation (without overload), and the stroke length gap between the main restoration component 53 and the auxiliary restoration component 54 reaches a certain distance, the automatic reset function can also be achieved (when the button 52 is pressed under external factors, the main rod 511 and the auxiliary rod 512 have an automatic reset gap with the bimetallic strip 4), the bimetallic strip 4 cools and resets, so that the moving terminal contact 32 and the bimetallic contact 42 are in a connected state, and this cycle is repeated to achieve the effect of automatic reset.

[0054] Manual reset function: In an overload situation, when the bimetal strip 4 is overloaded, it will expand due to heat, causing the moving terminal contact 32 and the bimetal strip contact 42 to be in a disconnected state. Then, by pressing down the button device 5, the moving terminal 3 and the bimetal strip 4 are manually connected, and the static terminal 2 and the moving terminal 3 can also be in contact, so that manual reset is possible.

[0055] like Figure 4 , Figure 8 and Fig. 9As shown, it also includes a light board 55 arranged on the fixed bracket 51, and an LED light is arranged on the light board 55. The LED light is used to illustrate the warning and lighting in the dark environment, and the power consumption is low, and a zero terminal 56 is arranged on the housing 1. The zero terminal 56 and the light board 55 are connected by a zero terminal spring 57, so as to achieve the connection between the two. It is also to be noted that a mounting column for mounting the zero terminal 56 is arranged on the housing 1, which is convenient for the installation of the zero terminal 56. In this embodiment, the main reset part 53 and the auxiliary reset part 54 are connected to the light board 55, especially the reset spring 533 in the main reset part 53 and the compression spring 541 in the auxiliary reset part 54 connect the moving terminal 3 to the light board 55, and the light board 55 is connected to the zero terminal 56 by the zero terminal spring 57, so as to achieve the conduction of the circuit, which is also conducive to the reset of the moving terminal 3. In this embodiment, the LED light can be used for warning, indicating that it is in an overload state, which is convenient for people to know.

[0056] like Fig.10 , Fig.11 and Fig.12 As shown, in order to improve the resetting effect of the bimetallic strip 4 and facilitate the easy resetting of the present invention, the lower surface of the fixed bracket 51 is provided with a pair of reset rods 513, which are located on the lower surface of one side of the fixed bracket 51. The pair of reset rods 513 press the bimetallic strip 4 during the downward movement, which is also conducive to the resetting of the bimetallic strip 4. The shell 1 is provided with a reset convex point 514 for resetting the bimetallic strip 4. The reset convex point 514 corresponds to one side of the bimetallic strip 4. This setting presses one side of the bimetallic strip 4 through the reset rod 513, and then the connection point 43 in the bimetallic strip 4 is reset, and the reset convex point 514 corresponds to one side of the bimetallic strip 4. This setting makes it easier and easier to reset the connection point 43 in the bimetallic strip 4, and this setting is more labor-saving for resetting. It should also be noted that the lower end surface of the reset rod 51 is elliptical, which is more conducive to contact with the bimetallic strip 4.

[0057] Embodiment 5: It can be described on the basis of Embodiment 3 or Embodiment 4, such as Figure 1 , Figure 2 and Figure 3As shown, the housing 1 includes a base 11 and a base 12 assembled on the base 11, and a limiting rod 13 is provided on the base 12 for the fixed bracket 51 to move back and forth, which is conducive to the fixed bracket 51 to move back and forth up and down. In this embodiment, the limiting rod 13 is located on both sides of the fixed bracket 51, which is more conducive to the fixed bracket 51 to move up and down more smoothly. Correspondingly, there is a sliding hole on both sides of the fixed bracket 51 for the limiting rod 13 to slide up and down. In order to prevent the fixed bracket 51 from falling off, an anti-falling block 131 is provided on the limiting rod 13, and the fixed bracket 51 can slide back and forth on the limiting rod 13 below the anti-falling block 131. This arrangement prevents the fixed bracket 51 from separating from the base 12, and has a simple structure and is easy to implement.

[0058] The standard parts used in the present application document can all be purchased from the market, and the specific connection methods of each part adopt conventional means such as mature bimetallic strips in the prior art. The internal components of the lamp panel adopt conventional models in the prior art, and its internal structure belongs to the prior art structure. Workers can complete normal operation according to the existing technical manual. In addition, the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here. It should be noted that although the above-mentioned embodiments have been described in this article, the scope of patent protection of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described in this article, or equivalent structures or equivalent process transformations made using the contents of the specification and drawings of the present invention, directly or indirectly applying the above technical solutions to other related technical fields are all included in the scope of protection of the patent of the present invention.

Claims

1. An overload protection switch, comprising a housing (1) and a static terminal (2) and a moving terminal (3) arranged on the housing (1), wherein the static terminal (2) and the moving terminal (3) are in contact with each other via a bimetallic strip (4), characterized in that: The static terminal (2) and the moving terminal (3) are in contact with each other through contacts on both sides, and the static terminal (2) and the moving terminal (3) are connected or disconnected by deformation of the bimetallic strip (4). The middle of the bimetallic strip (4) is fixed on the static terminal (2), and the edges of the bimetallic strip (4) are provided with contacts.

2. The overload protection switch according to claim 1, characterized in that: The bimetallic strip (4) comprises a sheet-shaped body (41) and a bimetallic strip contact (42) arranged in the middle of the sheet-shaped body (41); the bimetallic strip contact (42) can be connected to the moving terminal (3); and a connection point (43) is arranged in the middle of the sheet-shaped body (41); the connection point (43) is connected to the static terminal (2).

3. The overload protection switch according to claim 2, characterized in that: The sheet-shaped body (41) is circular or polygonal.

4. The overload protection switch according to claim 3, characterized in that: The polygon may be a quadrilateral, a hexagon, or an octagon.

5. The overload protection switch according to claim 1, 2, 3 or 4, characterized in that: The movable terminal (3) comprises a body (31) and a movable terminal contact (32) arranged on the body (31), wherein the movable terminal contact (32) is located above the bimetallic contact (42); in a normal state, the movable terminal contact (32) and the bimetallic contact (42) are in a connected state, while in an overload state, the movable terminal contact (32) and the bimetallic contact (42) are in a disconnected state.

6. The overload protection switch according to claim 1, 2, 3 or 4, characterized in that: A button device (5) is provided on the housing (1) for restoring the static terminal (2) to a state of connection with the moving terminal (3); the button device (5) comprises a fixed bracket (51) provided on the housing (1); a button (52) is provided on the fixed bracket (51); a main restoring component (53) and a secondary restoring component (54) are provided on the fixed bracket (51); the main restoring component (53) and the secondary restoring component (54) are both located above the moving terminal (3) in a normal state.

7. The overload protection switch according to claim 6, characterized in that: The main restoring component (53) comprises an upper gear (531) arranged below the fixed bracket (51), a lower gear (532) being matched with the upper gear (531), a return spring (533) being arranged inside the lower gear (532), and the lower gear (532) extending into the interior of the housing (1).

8. The overload protection switch according to claim 6, characterized in that: The lower surface of the fixed bracket (51) is provided with a main rod (511) for mounting the main restoration member (53) and a secondary rod (512) for mounting the secondary restoration member (54).

9. The overload protection switch according to claim 6, characterized in that: It also includes a lamp board (55) arranged on the fixing bracket (51), the lamp board (55) being provided with an LED lamp, and a zero terminal (56) arranged on the housing (1), the zero terminal (56) being connected to the lamp board (55) via a zero terminal spring (57).

10. The overload protection switch according to claim 6, characterized in that: The lower surface of the fixed bracket (51) is provided with reset rods (513) distributed in pairs. The reset rods (513) distributed in pairs are located on the lower surface of one side of the fixed bracket (51). The reset rods (513) distributed in pairs press the bimetallic strip (4) during the downward movement. The housing (1) is provided with reset convex points (514) for resetting the bimetallic strip (4). The reset convex points (514) correspond to one side of the bimetallic strip (4).

Images