CN210156333U - Overload protector - Google Patents
Overload protector Download PDFInfo
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- CN210156333U CN210156333U CN201921087833.0U CN201921087833U CN210156333U CN 210156333 U CN210156333 U CN 210156333U CN 201921087833 U CN201921087833 U CN 201921087833U CN 210156333 U CN210156333 U CN 210156333U
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- contact
- self
- bimetallic strip
- housing
- locking
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Abstract
The utility model is suitable for the technical field of overload switches, and provides an overload protector, which comprises a shell, a normally open contact, a self-locking contact, a bimetallic strip and a heating element, wherein the normally open contact, the self-locking contact, the bimetallic strip and the heating element are arranged on the shell; the normally open contact is connected with the first power line through a load, the self-locking contact is connected with the first power line, the bimetallic strip is connected with the second power line and is in contact with the normally open contact, and the bimetallic strip is separated from the normally open contact and is conducted with the heating body and the self-locking contact to form a closed loop when the load is overloaded. The overload protector of the utility model separates the bimetallic strip from the normally open contact and is conducted with the heating element and the self-locking contact to form a closed loop when the load is overloaded, thereby disconnecting the load loop, ensuring that no current passes through the load, playing a role in protecting the load and having good safety performance; meanwhile, the heating body generates heat when working and transmits the heat to the bimetallic strip, so that the bimetallic strip keeps the shape and is communicated with the self-locking contact piece and the heating body, the self-locking function is realized, and the safety performance is further improved.
Description
Technical Field
The utility model relates to an overload switch technical field, concretely relates to overload protection ware.
Background
With the increasing living standard of people, various household appliances enter thousands of households, and accordingly, safety accidents such as circuit overload and the like are caused due to improper use of the household appliances. In order to ensure safety, an overload protector is required to be arranged in a circuit, and when the circuit is overloaded, the overload protector can automatically cut off a power supply, so that electrical equipment and the like are protected, and safety is ensured.
In the prior art, most overload protectors in the market adopt a Polymeric Positive Temperature Coefficient (PPTC) element connected in series with a load, when the circuit is overloaded, a PPTC resistor is sharply increased to reduce a current passing through the circuit, so as to protect the load, but when the overload protector works, the load always has a current passing through the overload protector, and a low-power load in the circuit still works due to a leakage current, so that a certain safety risk exists.
SUMMERY OF THE UTILITY MODEL
The utility model provides an overload protector aims at solving prior art's overload protector and has the electric current to pass through all the time at the during operation load, has the problem of safe risk.
The utility model is realized in such a way that the overload protector comprises a shell, a normally open contact piece, a self-locking contact piece, a bimetallic strip and a heating body which are arranged on the shell;
the normally open contact is connected with a first power line through a load, the self-locking contact is connected with the first power line, the bimetallic strip is connected with a second power line and is in contact with the normally open contact, one of the first power line and the second power line is a live wire, the other one of the first power line and the second power line is a zero wire, and the bimetallic strip is separated from the normally open contact when the load is overloaded and is conducted with the heating body and the self-locking contact to form a closed loop.
Preferably, the heating element is fixed on the bimetallic strip, and the bimetallic strip can drive the heating element to contact with or separate from the self-locking contact piece.
Preferably, the bimetallic strip is including being fixed in the stiff end of shell and with the deformation end that the stiff end is connected and bending deformation, the deformation end with normal open contact switches on or with the heat-generating body reaches the auto-lock contact switches on.
Preferably, the normally open contact is provided with a first contact, the deformation end of the bimetallic strip is provided with a second contact, and the deformation end of the bimetallic strip is contacted with or separated from the first contact of the normally open contact through the second contact.
Preferably, the housing includes a first housing and a second housing that are fastened to each other, the normally-open contact and the bimetal are mounted to the first housing and extend outward of the second housing, and the self-locking contact is mounted to the second housing and extends outward of the first housing.
Preferably, the first shell is provided with a first mounting groove and a second mounting groove, and the second shell is provided with a third mounting groove; the normally open contact is embedded in the first mounting groove, the bimetallic strip is embedded in the second mounting groove, and the self-locking contact is embedded in the third mounting groove.
Preferably, the normally open contact is provided with a first limiting protrusion, and the second shell and the first limiting protrusion form a block to limit the normally open contact to move towards the outer side of the second shell; the bimetallic strip is provided with a second limiting bulge, and the second shell and the second limiting bulge form a block to limit the bimetallic strip to move towards the outer side of the second shell.
Preferably, two opposite sides of the normally-open contact piece are respectively provided with a first pointed protrusion, and the first pointed protrusions are in contact with the inner wall of the first mounting groove; the bimetallic strip is provided with a second pointed protrusion, and the second pointed protrusion is in contact with the inner wall of the second mounting groove.
Preferably, the self-locking contact piece is provided with a third limiting protrusion, and the first shell and the third limiting protrusion form a block to limit the self-locking contact piece to move towards the outer side of the first shell.
Preferably, the opposite two sides of the self-locking contact piece are respectively provided with a third pointed protrusion, and the third pointed protrusions are in contact with the inner wall of the third mounting groove.
The overload protector provided by the utility model is provided with the normally open contact piece, the self-locking contact piece, the bimetallic strip and the heating body, wherein the normally open contact piece is connected with the first power line through the load, the self-locking contact piece is connected with the first power line, the bimetallic strip is connected with the second power line and is contacted with the normally open contact piece, and the bimetallic strip is separated from the normally open contact piece when the load is overloaded, so that a load loop is disconnected, the load is ensured to have no current to pass, the effect of protecting the load is achieved, and the safety performance is good; meanwhile, when the overload protector is in overload protection, the bimetallic strip is conducted with the self-locking contact piece and the heating body to form a closed loop, heat is generated during the work of the heating body and is transmitted to the bimetallic strip, the bimetallic strip is enabled to keep the form, the self-locking contact piece and the heating body are conducted, the situation that the bimetallic strip automatically resets to conduct a load again is avoided, the self-locking function is achieved, and the safety performance is further improved.
Drawings
Fig. 1 is a schematic circuit diagram of an overload protector according to an embodiment of the present invention;
fig. 2 is a three-dimensional structure diagram of the overload protector according to the embodiment of the present invention;
fig. 3 is an exploded perspective view of an overload protector according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an overload protector according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view taken along line A-A of FIG. 4;
fig. 6 is an exploded perspective view of the normally-open contact piece and the bimetal piece of the overload protector and the first housing according to the embodiment of the present invention;
fig. 7 is an exploded perspective view of the self-locking contact piece and the second shell in the overload protector according to the embodiment of the present invention;
fig. 8 is a schematic structural diagram of the overload protector according to the embodiment of the present invention after the first housing is removed;
fig. 9 is a schematic structural diagram of the overload protector with the second housing removed according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The overload protector provided by the embodiment of the utility model is provided with the normally open contact piece, the self-locking contact piece, the bimetallic strip and the heating body, and the bimetallic strip is separated from the normally open contact piece when the load is overloaded, so that a load loop is disconnected, no current passes through the load, the effect of protecting the load is achieved, and the safety performance is good; meanwhile, when the overload protector is in overload protection, the bimetallic strip is conducted with the self-locking contact piece and the heating body to form a closed loop, heat is generated during the work of the heating body and is transmitted to the bimetallic strip, the bimetallic strip is enabled to keep the form, the self-locking contact piece and the heating body are conducted, the situation that the bimetallic strip automatically resets to conduct a load again is avoided, the self-locking function is achieved, and the safety performance is further improved.
Referring to fig. 1 to 5, an overload protector provided in an embodiment of the present invention includes a housing 1, and a normally open contact 2, a self-locking contact 3, a bimetal 4, and a heating element 5 disposed on the housing 1; the normally open contact 2 is connected with a first power line through a load 100, the self-locking contact 3 is connected with the first power line, the bimetallic strip 4 is connected with a second power line and is contacted with the normally open contact 2, one of the first power line and the second power line is a live wire, and the other one is a zero line; the bimetal 4 is separated from the normal open contact 2 and conducted with the heating element 5 and the self-locking contact 3 when the load 100 is overloaded.
In the embodiment of the utility model, the normally open contact 2 can be connected with the live wire of the power supply through the load 100, the self-locking contact 3 is connected with the live wire of the power supply, and the bimetallic strip 4 is connected with the zero line of the power supply and is contacted with the normally open contact 2; or, the normally open contact 2 is connected with the zero line of the power supply through the load 100, the self-locking contact 3 is connected with the zero line of the power supply, and the bimetallic strip 4 is connected with the live wire of the power supply and is contacted with the normally open contact 2.
For the sake of illustration, in this embodiment, the normally-on contact 2 is connected to the live wire through the load 100, the self-locking contact 3 is connected to the live wire, and the bimetal strip 4 is connected to the neutral wire and is in contact with the normally-on contact 2.
In the embodiment of the utility model, the normally open contact piece 2 is connected with the live wire through the load 100, the self-locking contact piece 3 is connected with the live wire, and the bimetallic strip 4 is connected with the zero line and is contacted with the normally open contact piece 2; when the load 100 is overloaded, the bimetallic strip 4 heats and bends and deforms to one side far away from the normally-open contact 2, so that the bimetallic strip 4 is separated from the normally-open contact 2 and is conducted with the heating body 5 and the self-locking contact 3 to form a closed loop, the load loop is disconnected, the load is ensured to have no current, the effect of protecting the load is achieved, and the safety performance is good; meanwhile, as the bimetallic strip 4 is conducted with the self-locking contact piece 3 through the heating body 5, the heating body 5 generates heat and transmits the heat to the bimetallic strip 4, so that the bimetallic strip 4 keeps the shape and is conducted with the self-locking contact piece 3, the bimetallic strip 4 is prevented from resetting automatically and conducting the load again, the self-locking function is realized, and the safety performance is further improved.
As an embodiment of the present invention, the housing 1 includes a first housing 11 and a second housing 12 that are fastened to each other, the normally open contact 2 and the bimetal piece 4 are installed in the first housing 11 and extend to the outside of the second housing 12, and the self-locking contact 3 is installed in the second housing 12 and extends to the outside of the first housing 11.
In the embodiment, the shell 1 is provided with the first shell 11 and the second shell 12 which are buckled with each other, so that the normally-open contact piece 2, the self-locking contact piece 3 and the bimetallic strip 4 can be conveniently installed; meanwhile, the normally open contact piece 2 and the bimetallic strip 4 extend out relative to the second shell 12, and the self-locking contact piece 3 extends out relative to the outer side of the first shell 11, so that wiring of the normally open contact piece 2, the self-locking contact piece 3 and the bimetallic strip 4 is facilitated.
Referring to fig. 6 and 7 in combination, as an embodiment of the present invention, the first housing 11 is provided with a first mounting groove 111 and a second mounting groove 112, and the second housing 12 is provided with a third mounting groove 121; the normal open contact 2 is embedded in the first mounting groove 111, the bimetallic strip 4 is embedded in the second mounting groove 112, and the self-locking contact 3 is embedded in the third mounting groove 121. When installation normal open contact 2, auto-lock contact 3 and bimetallic strip 4, inlay normal open contact 2 and locate first mounting groove 111, bimetallic strip 4 inlays and locates second mounting groove 112, inlays auto-lock contact 3 again and locates third mounting groove 121, then can accomplish this overload protection's equipment with the mutual lock of first casing 11 and second casing 12, simple to operate convenience.
Referring to fig. 8 in combination, as an embodiment of the present invention, the normally-open contact piece 2 is provided with a first limiting protrusion 21, and the second shell 12 and the first limiting protrusion 21 form a stop to limit the normally-open contact piece 2 from moving to the outside of the second shell 12; the bimetal 4 is provided with a second limiting protrusion 41, and the second housing 12 and the second limiting protrusion 41 form a stop to limit the bimetal 4 from moving to the outside of the second housing 12.
After the normally-open contact 2 is mounted in the first mounting groove 111 and the bimetallic strip 4 is mounted in the second mounting groove 112, the first shell 11 and the second shell 12 are buckled with each other, and the normally-open contact 2 can be prevented from moving to the outer side of the second shell 12 because the second shell 12 and the first limiting bulge 21 of the normally-open contact 2 form a resisting fit; similarly, the second shell 12 and the second limiting protrusion 41 of the bimetal strip 4 form a resisting fit, so that the bimetal strip 4 can be prevented from moving to the outer side of the second shell 12, the normally open contact piece 2 and the bimetal strip 4 are ensured to be firmly fixed on the shell 1, and the normally open contact piece 2 and the bimetal strip 4 are prevented from falling off.
As an embodiment of the present invention, the two opposite sides of the normally-open contact piece 2 are respectively provided with a first pointed protrusion 22, and the first pointed protrusion 22 contacts with the inner wall of the first mounting groove 111; the bimetal 4 is provided with a second protrusion 42, and the second protrusion 42 is in contact with the inner wall of the second mounting groove 112.
In this embodiment, the contact of the first pointed protrusions 22 of the two opposite sides of the normally open contact piece 2 with the inner wall of the first mounting groove 111 increases the friction between the normally open contact piece 2 and the inner wall of the first mounting groove 111, further reduces the risk that the normally open contact piece 2 falls off from the first mounting groove 111, the contact of the second pointed protrusion 42 of the bimetallic strip 4 with the inner wall of the second mounting groove 112 increases the friction between the bimetallic strip 4 and the inner wall of the second mounting groove 112, further reduces the risk that the bimetallic strip 4 falls off from the second mounting groove 112, thereby further ensuring that the normally open contact piece 2 and the bimetallic strip 4 are firmly fixed on the housing 1.
Referring to fig. 9 in combination, as an embodiment of the present invention, the self-locking contact piece 3 is provided with a third limiting protrusion 32, and the first housing 11 and the third limiting protrusion 32 form a block to limit the self-locking contact piece 3 from moving to the outside of the first housing 11.
In this embodiment, after the self-locking contact piece 3 is mounted in the third mounting groove 121 and the first housing 11 and the second housing 12 are fastened to each other, the first housing 11 and the third limiting protrusion 32 of the self-locking contact piece 3 form a resisting fit, so that the self-locking contact piece 3 is prevented from moving to the outside of the first housing 11.
As an embodiment of the present invention, the opposite sides of the self-locking contact piece 3 are respectively provided with a third sharp protrusion 33, and the third sharp protrusion 33 contacts with the inner wall of the third mounting groove 121.
Moreover, through set up the protruding 33 of third point at auto-lock contact 3, the contact of the inner wall of the protruding 33 of third point and third mounting groove 121, increased the friction of the inner wall of auto-lock contact 3 with third mounting groove 121, further reduce the risk that auto-lock contact 3 breaks away from third mounting groove 121, improved the fastness that auto-lock contact 3 is fixed.
As an embodiment of the present invention, the bimetal strip 4 includes the fixed end 43 fixed on the housing 1 and the deformation end 44 connected to the fixed end 43 and capable of bending deformation, and the deformation end 44 is conducted with the normal open contact 2 or with the heating element 5 and the self-locking contact 3.
Wherein, the fixed end 43 of the bimetal 4 is embedded in the second mounting groove 112 for fixing the whole bimetal 4 and for electrically connecting with an external power line. The second limiting protrusion 41 and the second pointed protrusion 42 are both disposed on the fixing end 43. The deformation end 44 is made of a material commonly used in the prior art for bimetallic strips, for example, the material of the active layer is manganese-nickel-copper alloy, nickel-chromium-iron alloy, nickel-manganese-iron alloy, nickel, etc.; the passive layer is made of nickel-iron alloy. The deformation end 44 can be bent and deformed when being heated, and when the load is overloaded, the heat generated by the current of the bimetallic strip 4 causes the deformation end 44 of the bimetallic strip 4 to be bent and deformed towards one side of the self-locking contact piece 3.
As an embodiment of the present invention, the heating element 5 is fixed to the bimetal strip 4, and the bimetal strip 4 can drive the heating element 5 to contact or separate from the self-locking contact piece 3. Specifically, the heating element 5 is fixed to the deformed end 44 of the bimetal 4. When the load 100 is overloaded, the deformation end 44 of the bimetal strip 4 bends and deforms to drive the heating element 5 to contact with the self-locking contact piece 3, and the bimetal strip 4, the heating element 5 and the self-locking contact piece 3 sequentially form a closed loop. Through being fixed in on bimetallic strip 4 with heat-generating body 5, be convenient for heat-generating body 5 produce heat direct transfer to bimetallic strip 4 on to improve bimetallic strip 4 and realize self-locking function's reliability. In addition, the heating element 5 can also be fixed on the self-locking contact piece 3, when the load 100 is overloaded, the bimetallic strip 4 is bent and deformed and is contacted with the heating element 5, and the bimetallic strip 4, the heating element 5 and the self-locking contact piece 3 sequentially form a closed loop.
As an embodiment of the utility model, normally open contact 2 is equipped with first contact 20, and the deformation end 44 of bimetallic strip 4 is equipped with second contact 40, and the deformation end 44 of bimetallic strip 4 contacts or separates through second contact 40 and normally open contact 2's first contact 20. The normally-open contact piece 2 and the bimetallic strip 4 are in contact conduction through the first contact 20 and the second contact 40, and the normally-open contact piece 2 and the bimetallic strip 4 are ensured to be stably contacted.
Referring to fig. 7 again, as an embodiment of the present invention, the self-locking contact piece 3 is provided with a third contact 30, and the bimetal piece 4 is contacted with the third contact 30 of the self-locking contact piece 3 through the heating element 5 when the load 100 is overloaded, so as to ensure the stable contact between the self-locking contact piece 3 and the heating element 5.
As an embodiment of the present invention, the heating element 5 is a heating resistor. The heating element 5 may be another device that generates heat when energized, such as a heating coil.
The utility model discloses an overload protector's theory of operation as follows: when the load 100 is not overloaded, the third contact 40 of the bimetallic strip 4 is contacted with the first contact 20 of the normally-on contact 2, so that the normal conduction of the load 100 is maintained; when the load 100 is overloaded, the deformation end 44 of the bimetal strip 4 is bent and deformed towards one side of the self-locking contact piece 3 by the heat generated by the current of the bimetal strip 4, the third contact 40 of the bimetal strip 4 is separated from the first contact 20 of the normal-open contact piece 2, and the bimetal strip 4 drives the heating body 5 to be in contact with the self-locking contact piece 3, so that the loop of the load 100 is disconnected, no current passes through the load 100 during overload protection, and the effect of protecting the load 100 is achieved; meanwhile, the bimetallic strip 4, the heating body 5 and the self-locking contact piece 3 form a loop, the heating body 5 continuously generates heat and transfers the heat to the bimetallic strip 4, so that the bimetallic strip 4 always maintains the form, the bimetallic strip 4 is prevented from resetting to conduct the load 100, the self-locking function is realized, the safety performance is good, only after a user turns off a power supply, the bimetallic strip 4 can reset and be in re-contact with the normally-open contact piece 2 after the temperature is reduced to a certain temperature, and the loop of the load 100 is conducted again after overload faults are manually eliminated.
The overload protector provided by the embodiment of the utility model is provided with the normally open contact piece, the self-locking contact piece, the bimetallic strip and the heating body, wherein the normally open contact piece is connected with the first power line through the load, the self-locking contact piece is connected with the first power line, the bimetallic strip is connected with the second power line and is contacted with the normally open contact piece, and the bimetallic strip is separated from the normally open contact piece when the load is overloaded, so that a load loop is disconnected, the load is ensured to have no current to pass through, the effect of protecting the load is achieved, and the safety performance is good; meanwhile, when the overload protector is in overload protection, the bimetallic strip is conducted with the self-locking contact piece and the heating body to form a closed loop, heat is generated during the work of the heating body and is transmitted to the bimetallic strip, the bimetallic strip is enabled to keep the form, the self-locking contact piece and the heating body are conducted, the situation that the bimetallic strip automatically resets to conduct a load again is avoided, the self-locking function is achieved, and the safety performance is further improved.
The above description is only exemplary of the present invention and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. An overload protector is characterized by comprising a shell, a normally open contact piece, a self-locking contact piece, a bimetallic strip and a heating body, wherein the normally open contact piece, the self-locking contact piece, the bimetallic strip and the heating body are arranged on the shell;
the normally open contact is connected with a first power line through a load, the self-locking contact is connected with the first power line, the bimetallic strip is connected with a second power line and is in contact with the normally open contact, one of the first power line and the second power line is a live wire, the other one of the first power line and the second power line is a zero wire, and the bimetallic strip is separated from the normally open contact when the load is overloaded and is conducted with the heating body and the self-locking contact to form a closed loop.
2. The overload protector according to claim 1, wherein the heating element is fixed to the bimetal, and the bimetal can drive the heating element to contact with or separate from the self-locking contact piece.
3. The overload protector according to claim 1, wherein the bimetal piece includes a fixed end fixed to the housing and a deformable end connected to the fixed end and capable of bending and deforming, and the deformable end is in conduction with the normally open contact or in conduction with the heating element and the self-locking contact.
4. The overload protector according to claim 3, wherein the normally-on contact is provided with a first contact point, and the deformation end of the bimetal is provided with a second contact point, and the deformation end of the bimetal is in contact with or separated from the first contact point of the normally-on contact through the second contact point.
5. The overload protector of claim 1, wherein the housing includes a first housing and a second housing that snap together, the normally-open contact and the bi-metallic strip being mounted to the first housing and extending outwardly of the second housing, and the self-locking contact being mounted to the second housing and extending outwardly of the first housing.
6. The overload protector according to claim 5, wherein the first housing is provided with a first mounting groove and a second mounting groove, and the second housing is provided with a third mounting groove; the normally open contact is embedded in the first mounting groove, the bimetallic strip is embedded in the second mounting groove, and the self-locking contact is embedded in the third mounting groove.
7. The overload protector according to claim 6, wherein the normally-open contact is provided with a first limit protrusion, and the second housing abuts against the first limit protrusion to limit the normally-open contact from moving to the outside of the second housing; the bimetallic strip is provided with a second limiting bulge, and the second shell and the second limiting bulge form a block to limit the bimetallic strip to move towards the outer side of the second shell.
8. The overload protector according to claim 6 or 7, wherein opposite sides of the normally-open contact piece are respectively provided with first pointed protrusions which are in contact with the inner wall of the first mounting groove; the bimetallic strip is provided with a second pointed protrusion, and the second pointed protrusion is in contact with the inner wall of the second mounting groove.
9. The overload protector of claim 6, wherein the self-locking contact is provided with a third limiting protrusion, and the first housing abuts against the third limiting protrusion to limit the movement of the self-locking contact to the outside of the first housing.
10. The overload protector according to claim 6 or 9, wherein the self-locking contact piece is provided with third nibs on opposite sides thereof, and the third nibs contact with the inner wall of the third mounting groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921087833.0U CN210156333U (en) | 2019-07-12 | 2019-07-12 | Overload protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921087833.0U CN210156333U (en) | 2019-07-12 | 2019-07-12 | Overload protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210156333U true CN210156333U (en) | 2020-03-17 |
Family
ID=69765884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921087833.0U Active CN210156333U (en) | 2019-07-12 | 2019-07-12 | Overload protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210156333U (en) |
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2019
- 2019-07-12 CN CN201921087833.0U patent/CN210156333U/en active Active
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