CN220290707U - Bimetallic strip thermal protector - Google Patents
Bimetallic strip thermal protector Download PDFInfo
- Publication number
- CN220290707U CN220290707U CN202321410462.1U CN202321410462U CN220290707U CN 220290707 U CN220290707 U CN 220290707U CN 202321410462 U CN202321410462 U CN 202321410462U CN 220290707 U CN220290707 U CN 220290707U
- Authority
- CN
- China
- Prior art keywords
- bottom plate
- static contact
- movable contact
- contact
- strip
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 230000001012 protector Effects 0.000 title claims abstract description 30
- 230000003068 static effect Effects 0.000 claims abstract description 60
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 18
- 210000000078 claw Anatomy 0.000 claims abstract description 13
- 239000002184 metal Substances 0.000 claims description 11
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000004033 plastic Substances 0.000 claims description 7
- 229920001707 polybutylene terephthalate Polymers 0.000 claims description 6
- 229910052709 silver Inorganic materials 0.000 claims description 6
- 239000004332 silver Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000010949 copper Substances 0.000 claims description 5
- 239000004734 Polyphenylene sulfide Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- -1 polybutylene terephthalate Polymers 0.000 claims description 4
- 229920000069 polyphenylene sulfide Polymers 0.000 claims description 4
- 238000001746 injection moulding Methods 0.000 claims description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 5
- 238000010891 electric arc Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 241001391944 Commicarpus scandens Species 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000005728 strengthening Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- NEIHULKJZQTQKJ-UHFFFAOYSA-N [Cu].[Ag] Chemical compound [Cu].[Ag] NEIHULKJZQTQKJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 229920000728 polyester Polymers 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Landscapes
- Thermally Actuated Switches (AREA)
Abstract
The utility model relates to the technical field of overload protectors, and discloses a bimetallic strip thermal protector which comprises a bottom plate positioned at the bottom, wherein a movable contact, a bimetallic strip and a static contact seat are arranged on the bottom plate; a static contact is arranged below the movable contact, and the static contact is arranged on a static contact seat; two riveting columns are arranged at one end of the bottom plate, two clamping claws are arranged at the other end of the bottom plate, the bottom plate is riveted with the bimetallic strip and the movable contact strip through the riveting columns, and the bottom plate is fixedly installed with the static contact strip seat through the clamping claws; two static contact piece reinforcing ribs are arranged on the static contact piece seat, and the static contact piece reinforcing ribs are respectively positioned on two sides of the static contact piece, which are close to the clamping jaw of the bottom plate. The bimetallic strip thermal protector disclosed by the utility model can prolong the service life of a product.
Description
Technical Field
The utility model relates to the technical field of overload protectors, in particular to a bimetallic strip thermal protector.
Background
Bimetallic thermal protectors are a commonly used device for circuit protection, also known as bimetallic thermostats. The principle is that two metal sheets with different expansion coefficients are bonded together to form a double-layer structure, and when the heating element exceeds a set temperature, the bimetallic sheet bends or twists due to the different thermal expansion coefficients of the two metals, so that overload protection is realized by disconnecting a circuit through a connector. Meanwhile, after the circuit is cooled, the bimetallic strip returns to the original state to turn on the circuit again. The thermal protector has the advantages of quick response, high reliability and the like, and is widely applied to the fields of household appliances, automobiles, air conditioners and the like.
The existing bimetallic strip type thermal protector is limited by the installation volume, the bimetallic strip structure and the assembly relation of all internal components, the phenomenon of serious arc discharge between the contacts caused by frequent separation and closing of the static contact and the movable contact can occur in the use process, and the arc discharge refers to the arc formed by the fact that the current is larger than the rated load capacity of the contacts when a circuit is opened, and the contacts are heated and damaged by the arc; in addition, because the claw distance of the static contact piece and the bottom plate is relatively close, the static contact piece is easy to break down with the claw of the bottom plate, and the short-circuit service life of the thermal protector is far behind the requirements of the related field.
Disclosure of Invention
Aiming at the problem that the bimetallic strip thermal protector is short-circuited because the fixed contact is easy to break down with the claw of the bottom plate due to the fact that the claw distance between the fixed contact and the bottom plate is relatively short in the use process of the bimetallic strip thermal protector in the prior art, the bimetallic strip thermal protector capable of preventing the short circuit is designed, and aims to achieve an isolation effect on the bottom plate and the claw by additionally arranging the reinforcing ribs on the two sides of the fixed contact, increase the creepage distance of a product and prolong the service life of the product.
The technical scheme adopted by the device is as follows: the bimetallic strip heat protector comprises a bottom plate positioned at the bottom, wherein a movable contact strip, a bimetallic strip and a static contact strip seat are arranged on the bottom plate, one end of the movable contact strip is riveted with a movable contact, the other end of the movable contact strip is provided with two movable contact strip holes, and the movable contact strip is riveted and installed with the bottom plate through the movable contact strip holes; a static contact is arranged below the movable contact, and the static contact is arranged on a static contact seat; two riveting columns are arranged at one end of the bottom plate, two clamping claws are arranged at the other end of the bottom plate, the bottom plate is riveted with the bimetallic strip and the movable contact strip through the riveting columns, and the bottom plate is fixedly installed with the static contact strip seat through the clamping claws; two static contact piece reinforcing ribs are arranged on the static contact piece seat, and the static contact piece reinforcing ribs are respectively positioned on two sides of the static contact piece, which are close to the clamping jaw of the bottom plate.
Preferably, the bimetal is butterfly-shaped, two metal sheet holes are formed in one end of the bimetal, and the bimetal is riveted and installed with the bottom plate through the metal sheet holes.
Preferably, the static contact seat is formed by injection molding of a static contact and plastic.
Preferably, the plastic material of the static contact pad is polybutylene terephthalate or polyphenylene sulfide.
Preferably, a bottom plate hole is formed in the middle of the bottom plate, and the bottom plate hole is used for reducing arc discharge between contacts.
Preferably, the two sides of the bottom plate are respectively provided with bottom plate reinforcing ribs, and the bottom plate reinforcing ribs are used for improving the rigidity of the bottom plate.
Preferably, the movable contact is made of a composite material of silver and copper.
Compared with the prior art, the device has the following beneficial effects: through set up the strengthening rib in the both sides of static contact, increased the creepage distance of product for the thermal protector is difficult to the short circuit inefficacy, has showing the life who has improved the product.
Drawings
Fig. 1 is a schematic structural view of a thermal protector of the present embodiment.
Fig. 2 is a top view of fig. 1.
Fig. 3 is a top view of the stationary contact holder of the present embodiment.
Fig. 4 is a top view of the base plate of the present embodiment.
Fig. 5 is a plan view of the bimetal of the present embodiment.
Fig. 6 is a top view of the movable contact according to the present embodiment.
Wherein, 1, a movable contact piece; 2. bimetallic strips; 3. a static contact base; 4. a bottom plate; 5. a stationary contact; 11. a movable contact; 12. a movable contact hole; 21. a metal sheet hole; 31. a static contact reinforcing rib; 41. riveting a column; 42. and (3) clamping jaws.
Detailed Description
In order that the above objects, features and advantages of the utility model will be readily understood, a more particular description of the utility model will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model. The present utility model may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the utility model, whereby the utility model is not limited to the specific embodiments disclosed below.
The following detailed description of the embodiments of the utility model, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the utility model, and to aid in its practice, by those skilled in the art. In the following embodiments, the terms "upper", "lower", "left", "right", "top" and "bottom" do not represent an absolute distinction in terms of structure and/or function, but are merely for convenience of description.
As shown in fig. 1 and 2, a bimetal thermal protector comprises a bottom plate 4 positioned at the bottom, wherein a movable contact 1, a bimetal 2 and a static contact seat 3 are arranged on the bottom plate 4, one end of the movable contact 1 is riveted with a movable contact 11, the other end of the movable contact is provided with two movable contact holes, and the movable contact 1 is riveted with the bottom plate 4 through the movable contact holes; a static contact 5 is arranged below the movable contact 11, and the static contact 5 is arranged on the static contact seat 3; as shown in fig. 4, two riveting columns 41 are arranged at one end of the bottom plate 4, two clamping claws 42 are arranged at the other end of the bottom plate 4, the bottom plate 4 is riveted with the bimetallic strip 2 and the movable contact strip 1 through the riveting columns 41, and the bottom plate is fixedly installed with the static contact strip seat 3 through the clamping claws; as shown in fig. 3, two static contact reinforcing ribs 31 are provided on the static contact seat 3, and the static contact reinforcing ribs 31 are respectively located at two sides of the static contact 5, which are close to the bottom plate clamping jaw 42.
Specifically, as shown in fig. 5, the bimetal 2 is in a butterfly shape, two metal sheet holes 21 are formed at one end of the bimetal 2, and the bimetal 2 is riveted and mounted with the bottom plate 4 through the metal sheet holes 21. The use of butterfly-shaped bimetal strip 2 increases its sensitivity and response speed, since the butterfly-shaped design enables the bimetal strip 2 to bend faster when subjected to temperature changes. In addition, the butterfly design may also reduce mechanical stress concentrations, thereby improving the durability and reliability of the bi-metallic strip 2.
Specifically, the static contact pad 3 is formed by combining the static contact pad 5 and plastic through injection molding, in this embodiment, the plastic forming the static contact pad 3 is polybutylene terephthalate (PBT), and the polybutylene terephthalate is a milky semitransparent to opaque and semi-crystalline thermoplastic polyester, has high heat resistance, is not strong acid and alkali resistant, can resist organic solvents, is flammable, is decomposed at high temperature, and has good comprehensive properties such as heat resistance, flame retardance, electrical insulation and the like, and good processability. In other embodiments, polyphenylene sulfide (PPS) plastic may also be used in place of PBT and serve a similar function.
Specifically, as shown in fig. 4, a bottom plate hole for reducing arcing between contacts is opened in the middle of the bottom plate 4. Arcing between contacts refers to an arc that occurs when the circuit is broken due to a current greater than the rated load capacity of the contacts, which may cause the contacts to be heated and damaged. The middle position of the bottom plate 4 is provided with a small hole, so that the risk of breakdown of the static contact 5 and the bottom plate 4 can be reduced to a certain extent. In addition, a bottom plate reinforcing rib is respectively arranged on two sides of the bottom plate 4, and the bottom plate reinforcing ribs are made of steel materials and used for enhancing the structural stability and the high temperature resistance of the bottom plate, and the rigidity of the bottom plate 4 is improved.
Specifically, the movable contact 11 is made of a composite material of silver and copper, i.e., the movable contact 11 is a silver-copper composite contact. The purpose of this design is that silver generally has good electrical conductivity and low contact resistance, but under high load operating conditions, more oxide is produced, making the contact vulnerable. Copper, in contrast, has good corrosion resistance but does not have as good electrical conductivity and contact resistance as silver. Therefore, by combining the two materials of silver and copper, the respective advantages thereof can be taken into consideration, and the durability and reliability of the movable contact 11 can be improved.
Specifically, as shown in fig. 3, two static contact reinforcing ribs 31 are disposed on the static contact seat 3, and the static contact reinforcing ribs 31 are respectively located at two sides of the static contact 5, which are close to the clamping jaw of the bottom plate 4. The purpose of this design is that because bimetallic thermal protector during operation static contact 5 and movable contact 11 frequently separate, close, the contact draws the arc seriously, and static contact 5 is nearer with bottom plate 4's jack catch distance for static contact 5 is broken down with bottom plate 4 jack catch easily, leads to thermal protector short circuit, and the strengthening rib of static contact 5 both sides has increased the creepage distance of product, makes thermal protector be difficult to short circuit inefficacy, can show the life that improves the product.
The specific working process of the embodiment is as follows: in the initial state, the movable contact 11 is in an abutting state with the static contact 5, when the temperature of the position where the thermal protector is located rises to a preset temperature protection value, the concave surface of the bimetallic strip 2 is turned upwards, the concave surface of the movable contact 1 is pushed to be turned upwards, the abutting part of the movable contact 11 and the static contact 5 is separated, and a circuit is disconnected, so that corresponding electrical equipment is protected from being damaged due to overheating. When the temperature of the position of the thermal protector is reduced to a certain value, the concave surface of the bimetallic strip 2 is turned downwards to return to the initial position, and the concave surface of the movable contact strip 1 is kept in an upwards turned state on the premise of no external force, namely, the movable contact 11 and the static contact strip 5 are kept in a separated state and cannot be reset automatically, so that the disposable thermal protection is realized.
It should be noted that the solution described in the embodiments of the present application is only one implementation manner, and simple modifications based on this implementation manner should be considered as those of ordinary skill in the art, which are suggested by the present application, and structural manners and embodiments similar to the technical solution should not be creatively devised without departing from the gist of the present utility model.
Claims (7)
1. The bimetallic strip heat protector is characterized by comprising a bottom plate positioned at the bottom, wherein a movable contact, a bimetallic strip and a static contact seat are arranged on the bottom plate, one end of the movable contact is riveted with a movable contact, the other end of the movable contact is provided with two movable contact holes, and the movable contact is riveted and installed with the bottom plate through the movable contact holes; a static contact is arranged below the movable contact, and the static contact is arranged on a static contact seat; two riveting columns are arranged at one end of the bottom plate, two clamping claws are arranged at the other end of the bottom plate, the bottom plate is riveted with the bimetallic strip and the movable contact strip through the riveting columns, and the bottom plate is fixedly installed with the static contact strip seat through the clamping claws; two static contact piece reinforcing ribs are arranged on the static contact piece seat, and the static contact piece reinforcing ribs are respectively positioned on two sides of the static contact piece, which are close to the clamping jaw of the bottom plate.
2. The bimetal thermal protector of claim 1, wherein the bimetal is butterfly-shaped, two metal sheet holes are formed at one end of the bimetal, and the bimetal is installed with the bottom plate in a riveting manner through the metal sheet holes.
3. The bi-metal strip heat protector of claim 1 wherein said stationary contact base is formed by injection molding a stationary contact with plastic.
4. A bimetal thermal protector according to claim 3 wherein the plastic material of the stationary contact seat is polybutylene terephthalate or polyphenylene sulfide.
5. The bi-metal strip thermal protector of claim 1, wherein a floor aperture is provided in the middle of the floor for reducing arcing between contacts.
6. The bimetal thermal protector of claim 5, wherein the base plate reinforcing ribs are respectively provided at both sides of the base plate, and the base plate reinforcing ribs are used for improving rigidity of the base plate.
7. A bi-metallic strip thermal protector as claimed in claim 1 wherein said movable contact is made of a composite of silver and copper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321410462.1U CN220290707U (en) | 2023-06-05 | 2023-06-05 | Bimetallic strip thermal protector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321410462.1U CN220290707U (en) | 2023-06-05 | 2023-06-05 | Bimetallic strip thermal protector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220290707U true CN220290707U (en) | 2024-01-02 |
Family
ID=89328478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321410462.1U Active CN220290707U (en) | 2023-06-05 | 2023-06-05 | Bimetallic strip thermal protector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220290707U (en) |
-
2023
- 2023-06-05 CN CN202321410462.1U patent/CN220290707U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |