CN220796587U - High-power overload protector - Google Patents
High-power overload protector Download PDFInfo
- Publication number
- CN220796587U CN220796587U CN202220970958.3U CN202220970958U CN220796587U CN 220796587 U CN220796587 U CN 220796587U CN 202220970958 U CN202220970958 U CN 202220970958U CN 220796587 U CN220796587 U CN 220796587U
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- welding
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- 230000001012 protector Effects 0.000 title claims abstract description 21
- 238000010438 heat treatment Methods 0.000 claims abstract description 49
- 238000003466 welding Methods 0.000 claims abstract description 47
- 239000011521 glass Substances 0.000 claims abstract description 8
- 230000003068 static effect Effects 0.000 claims abstract description 8
- 235000001674 Agaricus brunnescens Nutrition 0.000 claims abstract description 5
- 239000000919 ceramic Substances 0.000 claims abstract description 5
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims abstract description 4
- 238000003825 pressing Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 8
- 239000011261 inert gas Substances 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims description 3
- 238000005336 cracking Methods 0.000 abstract description 3
- 210000004127 vitreous body Anatomy 0.000 abstract 1
- 230000008569 process Effects 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 230000004075 alteration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000002679 ablation Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- UYKQQBUWKSHMIM-UHFFFAOYSA-N silver tungsten Chemical compound [Ag][W][W] UYKQQBUWKSHMIM-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Thermally Actuated Switches (AREA)
- Manufacture Of Switches (AREA)
Abstract
The utility model discloses a high-power overload protector, which comprises a shell, a pressure plate, a heating plate assembly, a spring, a bracket, a bottom plate assembly and pressure plate welding nails, wherein the bottom plate assembly comprises three binding posts with static contacts and a bottom plate, the binding posts are in a mushroom shape, three ceramic plates for insulation are respectively arranged between the binding posts and the bottom plate, and glass is filled between the binding posts and the bottom plate and combined together through high-temperature sintering; the heating plate component comprises a bimetallic strip, a heating plate, three movable contacts and a double-plate welding nail; the bracket and the bottom plate component are welded in the center of the bottom plate in a resistance welding mode; the spring is arranged in the center of the bracket, and the heating plate component is arranged on the bottom plate welded with the bracket; the pressure plate welding nail is welded in the center of the shell, and the shell welded with the pressure plate welding nail is reversely buckled on the assembled bottom plate. The utility model can effectively reduce the cracking phenomenon of the vitreous body caused by heating of the binding post contact, and the internal resistance of the product is more stable.
Description
Technical Field
The utility model relates to a high-power overload protector, and belongs to the technical field of power electronics.
Background
The heat sensing protector is widely applied to circuits of household appliances, motors, refrigeration equipment, heating equipment and other electrical appliances, and can generate physical deformation inside a switch according to the temperature change of a working environment, so that certain special effects are generated, a series of automatic control elements for disconnection are generated, and the circuit is protected.
As shown in fig. 1, in the conventional heat sensing protector, a post of a protruding base plate and a stationary contact are welded together by resistance welding, the studs protruding from the base plate during welding generate heat and vertical forces that can lead to cracking of the glass being filled. The welding strength of the binding post and the fixed contact cannot be guaranteed, a large heat is generated at the welding position in the energizing process of the protector, the temperature of the contact is increased due to the heat, and accordingly the filled glass body cracks are enlarged, and the protector leaks and fails.
As shown in fig. 1, in the conventional heat sensing protector, the gaps between the 7-shaped hooks at the head of the bracket and the three corresponding holes at the edge of the pressure plate are too large when the pressure plate is installed, and in the process of conveying the pressure plate to seal welding of products, parts are loosened due to vibration, and the subsequent seal welding process is also required to be installed for the second time.
Disclosure of Invention
The utility model provides a novel heat sensing protector. The static contact and the support are redesigned, and the defects existing in the existing products are overcome.
The technical scheme adopted in the utility model is as follows:
the high-power overload protector comprises a shell, a pressure plate, a heating plate assembly, a spring, a support, a bottom plate assembly and pressure plate welding nails, wherein the shell is arranged on the bottom plate assembly to form a closed accommodating space, the pressure plate, the heating plate assembly, the spring and the support are all positioned in the accommodating space, and inert gas is filled in the accommodating space;
the bottom plate assembly comprises three binding posts with fixed contacts and a bottom plate, the binding posts are in a mushroom shape, the lower part of the binding posts is a cylinder, and the top of the binding posts is a circular fixed contact; three ceramic plates for insulation are respectively arranged between the binding post and the bottom plate, and glass is filled between the binding post and the bottom plate and combined together in a high-temperature sintering mode;
the heating plate component comprises a bimetallic strip, a heating plate, three movable contacts and a double-plate welding pin; the three movable contacts are welded on the heating plate through resistance welding respectively, the three movable contacts correspond to the static contacts on the three binding posts one by one, and the bimetallic strip on the heating plate assembly passes through the double-plate welding nail and is welded with the heating plate through resistance welding; the three movable contacts and the heating plate are welded together in a resistance welding mode;
the bracket and the bottom plate component are welded in the center of the bottom plate in a resistance welding mode; the spring is arranged in the center of the bracket, the heating plate component is arranged on the bottom plate welded with the bracket, and the three components are fixed together through the pressure plate; the pressure plate welding nail is welded in the center of the shell, the shell welded with the pressure plate welding nail is reversely buckled on the assembled bottom plate, and the pressure plate welding nail and the shell are welded together through a special welding fixture of the protector.
Preferably, the support comprises a foot plate and a plurality of support frames, wherein the foot plate comprises a plurality of support legs, each support frame and one support leg of the foot plate are integrally bent and formed, the support frames are perpendicular to the plane of the foot plate, the top end of each support frame is provided with a buckling head, the end parts of the buckling heads are two intersected inclined planes, the bottom of each inclined plane on the outer side exceeds the plane of the side part of each support frame, and the outer side of each inclined plane protrudes outwards to form a barb shape; the support is arranged on the bottom plate, the support legs of the support leg plates and the binding posts are arranged at equal intervals, a positioning convex column is arranged at the center of the support leg plate, and one end of the spring is positioned and arranged on the positioning convex column.
Preferably, the number of the buckling heads is 3.
Preferably, a protrusion is arranged at one side of the center of the heating plate away from the movable contact, and is used for contacting with the bimetallic strip, and a plurality of limiting grooves are uniformly formed in the heating plate along the circumferential direction and are in matched limiting installation with the supporting frame.
Preferably, the bimetal strip and the pressure plate are both of concave-convex structures, the convex surface of the bimetal strip is in contact with the convex surface of the heating strip, the concave surface of the bimetal strip is opposite to the concave surface of the pressure plate, a plurality of first clamping grooves are uniformly formed in the circumferential direction of the bimetal strip, a plurality of second clamping grooves are uniformly formed in the circumferential direction of the pressure plate, and the first clamping grooves and the second clamping grooves are used for being clamped with the clamping heads.
Beneficial effects effects of
The utility model replaces the original binding post of the protruding bottom plate and the fixed contact welded on the binding post with a contact with a function of a binding post pin, and the shape is similar to that of a mushroom. The improved contact penetrates through the ceramic sheet and the glass body filled in the bottom plate, and the manufacturing process of the bottom plate is completed through a high-temperature sintering mode. Therefore, the cracking phenomenon of the glass body caused by heating of the binding post contact can be effectively reduced, and the internal resistance of the product is more stable.
The utility model improves three 7-shaped hooks of the head of the original bracket into a bracket with a similar barb shape, a pressure plate corresponding to the bracket is pressed downwards through a corresponding hole in the installation process, and the bracket with the similar barb shape can tightly lock the pressure plate. The product is not loosened due to vibration during the process of being transported to the next working procedure. The improvement should not affect the temperature regulation of the product for structural changes.
Drawings
Fig. 1 is an exploded view of a prior art thermal sensor protector.
FIG. 2 is a schematic view of the overall structure of the present utility model;
FIG. 3 is a schematic diagram of an exploded construction of the present utility model;
FIG. 4 is a cross-sectional view of the structure of the present utility model;
FIG. 5 is a schematic view of the platen structure of the present utility model;
fig. 6 is a schematic view of the bimetal structure of the present utility model;
FIG. 7 is a schematic structural view of the terminal of the present utility model;
FIG. 8 is a cross-sectional view of the moving and static contacts of the present utility model open;
FIG. 9 is a cross-sectional view of the moving and static contact closure of the present utility model;
fig. 10 is a schematic view of the stent of the present utility model.
Detailed Description
In order to better understand the technical solutions in the present application, the following description will clearly and completely describe the technical solutions in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
As shown in fig. 2-7, the high-power overload protector comprises a shell 1, a pressure plate 5, a heating plate assembly, a spring 10, a bracket 11, a bottom plate assembly and pressure plate welding nails 4, wherein the shell 1 is arranged on the bottom plate assembly to form a closed accommodating space, the pressure plate 5, the heating plate assembly, the spring 10 and the bracket 11 are all positioned in the accommodating space, and inert gas is filled in the accommodating space;
the bottom plate assembly comprises three binding posts 3 with fixed contacts and a bottom plate 2, wherein the binding posts 3 are in an integrated shape and are in a mushroom shape, the lower part of each binding post is a cylinder 3-1, and the top of each binding post is a circular fixed contact 3-2; three ceramic plates 13 for insulation are respectively arranged between the binding post 3 and the bottom plate 2, and glass 12 is filled between the binding post 3 and the bottom plate 2 and combined together in a high-temperature sintering mode;
the heating plate component comprises a bimetallic strip 7, a heating plate 8, three movable contacts 9 and a double-plate welding pin 6; the three movable contacts 9 are welded on the heating plate 8 through resistance welding respectively, the three movable contacts 9 correspond to the positions of the fixed contacts 3-2 on the three binding posts 3 one by one, and the bimetallic strip 7 on the heating plate assembly passes through the twin-plate welding nails 6 and is welded with the heating plate 8 through resistance welding; the three movable contacts 9 and the heating plate 8 are welded together in a resistance welding mode;
the bracket 11 and the bottom plate component are welded in the center of the bottom plate 2 in a resistance welding mode; the spring 10 is arranged in the center of the bracket 11, the heating plate component is arranged on the bottom plate 2 welded with the bracket, and the three components are fixed together through the pressure plate 5; the pressure plate welding nail 4 is welded at the center of the shell 1, the shell 1 welded with the pressure plate welding nail 4 is reversely buckled on the assembled bottom plate 2, and the pressure plate welding nails are welded together through a special welding fixture of the protector.
Preferably, the bracket 11 includes a foot plate 11-1 and a plurality of supporting frames 11-2, the foot plate 11-1 includes a plurality of supporting legs, each supporting frame 11-2 and one supporting leg of the foot plate 11-1 are integrally bent and formed, the supporting frame 11-2 is perpendicular to the plane of the foot plate 11-1, the top end of the supporting frame 11-2 is provided with a buckling head 11-3, the end of the buckling head 11-3 is provided with two intersecting inclined planes, the bottom of the inclined plane on the outer side exceeds the side plane of the supporting frame, and the inclined planes protrude outwards to form a barb shape; as shown in fig. 10, the bracket 11 is disposed on the bottom plate 2, the legs of the leg plate 11-1 and the binding post 3 are disposed at uniform intervals, a positioning convex column is disposed at the center of the leg plate 11-1, and one end of the spring 10 is disposed on the positioning convex column in a positioning manner.
Preferably, the number of the snap heads 11-3 is 3.
Preferably, a protrusion is disposed at a side of the center of the heating plate 8 away from the movable contact, and is used for contacting with the bimetal 7, and a plurality of limiting grooves 8-1 are uniformly disposed on the heating plate 8 along the circumferential direction and are in fit limiting installation with the supporting frame 11-2.
Preferably, the bimetal strip 7 and the pressure plate 5 are both of concave-convex structures, the convex surface of the bimetal strip 7 is in contact with the convex surface of the heating strip 8, the concave surface of the bimetal strip 7 is opposite to the concave surface of the pressure plate 5, a plurality of first clamping grooves 7-1 are uniformly formed in the circumferential direction of the bimetal strip 7, a plurality of second clamping grooves 5-1 are uniformly formed in the circumferential direction of the pressure plate 5, and the first clamping grooves 7-1 and the second clamping grooves 5-1 are both used for being clamped with the clamping heads 11-3.
And (3) product calibration: the F calibration force is applied to the product shell 1, the pressing plate welding nail 4 acts on the center of the pressing plate 5, the pressing plate 5 is of an elastic central symmetrical structure, uniform deformation is generated after stress, uniform downward pressure is generated at the lower edge of the pressing plate, the downward pressure acts on the bimetallic strip 7, and the bimetallic strip 7 is pre-pressed to reach an ideal action temperature point.
Positioning a pressure plate: the pressing plate 5 is provided with holes, the buckling heads 11-3 of the bracket 11 are sleeved in, then the pressing plate 4 is uniformly pressed downwards in three directions, the buckling heads 11-3 are clamped on the pressing plate 5, an upward supporting force is provided through the bottom springs 10, at the moment, the pressing plate 5 is fixed by the springs 10 and the buckling heads 11-3 in the up-down direction, the left-right direction is fixed by the friction force on the buckling heads 11-3, and the whole pressing plate is completely positioned.
The spring 10 is added at the right center of the three-contact system, so that the three contacts can be balanced better, in addition, upward thrust can be provided in the process of opening the contacts, so that a circuit is opened more rapidly, and resistance can be provided in the process of closing the contacts, so that the collision between the moving contact and the static contact is relieved.
The movable contact and the fixed contact are made of silver tungsten carbide composite materials, so that the contact resistance between the contacts can be effectively reduced, the temperature rise of the contacts is improved, the hardness of the surfaces of the contacts is improved, the arc ablation resistance of the contacts is improved, and then inert mixed gas is sealed in a matched manner, so that the electrical performance and the service life of the protector are greatly improved.
The working principle of the utility model is as follows:
as shown in fig. 8-9, when the current is normal, the temperature of the heating plate 8 does not reach the action temperature of the bimetal 7, the shell 1 presses the pressing plate 5, the pressing plate 5 presses the edge of the bimetal 7, the bimetal 7 and the heating plate 8 are connected together by the double-plate welding pin 6 to provide contact pressure to the dynamic and static contacts, and the circuit is in a closed state.
When an excessive abnormal current occurs, the heating plate 8 can instantly emit a large amount of heat, so that the ambient temperature of the bimetallic strip 7 reaches the action temperature, and the bimetallic strip 7 can perform a jump action. The bimetal 7 pulls the heating plate 8 and the movable contact 9 to move upwards together through the double-plate welding pin 6, the movable contact and the movable contact are separated, and the circuit is disconnected.
When the circuit is disconnected, no current is supplied to the heating plate 8, the cooling is slowly started, the ambient temperature around the bimetallic strip 7 is slowly reduced to the recovery temperature, and at the moment, the bimetallic strip 7 performs a recovery jump action. The heating plate 8 can bring the movable contact 9 to be pressed downwards, the movable contact and the movable contact are restored to be contacted, and the circuit returns to the closed state.
The foregoing is only a preferred embodiment of the present utility model, and it should be noted that it is possible, for one of ordinary skill in the art, modifications and alterations may be made without departing from the principles of this utility model, and such modifications and alterations should also be considered as being within the scope of the utility model.
Claims (4)
1. The high-power overload protector comprises a shell, a pressure plate, a heating plate assembly, a spring, a support, a bottom plate assembly and pressure plate welding nails, wherein the shell is arranged on the bottom plate assembly to form a closed accommodating space, the pressure plate, the heating plate assembly, the spring and the support are all positioned in the accommodating space, and inert gas is filled in the accommodating space; the method is characterized in that:
the bottom plate assembly comprises three binding posts with fixed contacts and a bottom plate, the binding posts are in a mushroom shape, the lower part of the binding posts is a cylinder, and the top of the binding posts is a circular fixed contact; three ceramic plates for insulation are respectively arranged between the binding post and the bottom plate, and glass is filled between the binding post and the bottom plate and combined together in a high-temperature sintering mode;
the heating plate component comprises a bimetallic strip, a heating plate three movable contacts and a double-piece welding nail; the three movable contacts are welded on the heating plate through resistance welding respectively, the three movable contacts correspond to the static contacts on the three binding posts one by one, and the bimetallic strip on the heating plate assembly passes through the double-plate welding nail and is welded with the heating plate through resistance welding; the three movable contacts and the heating plate are welded together in a resistance welding mode;
the bracket and the bottom plate component are welded in the center of the bottom plate in a resistance welding mode; the spring is arranged in the center of the bracket, the heating plate component is arranged on the bottom plate welded with the bracket, and the three components are fixed together through the pressure plate; the pressing plate welding nails are welded at the center of the shell, the shell welded with the pressing plate welding nails is reversely buckled on the assembled bottom plate, and the pressing plate welding nails are welded together through a special welding fixture of the protector;
the support comprises a foot plate and a plurality of support frames, wherein each support frame and one support leg of the support leg plate are integrally bent and formed, the support frames are perpendicular to the plane of the support leg plate, the top end of each support frame is provided with a buckling head, the end parts of the buckling heads are two intersected inclined planes, the bottom of each inclined plane at the outer side exceeds the side plane of the support frame, and the outer side of each inclined plane protrudes outwards to form a barb shape; the support is arranged on the bottom plate, the support legs of the support leg plates and the binding posts are arranged at equal intervals, a positioning convex column is arranged at the center of the support leg plate, and one end of the spring is positioned and arranged on the positioning convex column.
2. A high power overload protector according to claim 1 wherein the number of said snap-fit heads is 3.
3. The high-power overload protector according to claim 1, wherein a protrusion is arranged on one side, far away from the movable contact, of the center of the heating plate, and is used for being in contact with the bimetallic strip, and a plurality of limiting grooves are uniformly formed in the circumferential direction of the heating plate and are in matched limiting installation with the supporting frame.
4. The high-power overload protector according to claim 1, wherein the bimetal strip and the pressure plate are of concave-convex structures, the convex surface of the bimetal strip is in contact with the convex surface of the heating strip, the concave surface of the bimetal strip is opposite to the concave surface of the pressure plate, a plurality of first clamping grooves are uniformly formed in the circumferential direction of the bimetal strip, a plurality of second clamping grooves are uniformly formed in the circumferential direction of the pressure plate, and the first clamping grooves and the second clamping grooves are used for being clamped with the clamping heads.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220970958.3U CN220796587U (en) | 2022-04-25 | 2022-04-25 | High-power overload protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220970958.3U CN220796587U (en) | 2022-04-25 | 2022-04-25 | High-power overload protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220796587U true CN220796587U (en) | 2024-04-16 |
Family
ID=90666637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220970958.3U Active CN220796587U (en) | 2022-04-25 | 2022-04-25 | High-power overload protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220796587U (en) |
-
2022
- 2022-04-25 CN CN202220970958.3U patent/CN220796587U/en active Active
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