Plug with over-temperature protection
By using thermal bimetallic sheets as temperature control protection components in the power plug, the problem of lack of temperature monitoring of traditional plugs is solved, and fast and reliable circuit protection is achieved, preventing fires and reducing costs.
Patent Information
- Application Number
- CN202421846526.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-31
- Publication Date
- 2025-07-11
- Estimated Expiration
- 2034-07-31
AI Technical Summary
Traditional power plugs lack effective temperature monitoring and protection mechanisms, which may cause fires or safety accidents to overheat the appliance. The existing temperature protection components are slow to respond, poorly reliable and costly.
Thermal bimetallic sheet is used as the temperature control protection element. When the temperature reaches the preset value, thermal bimetallic sheet bends and deforms to remove the moving contacts from the pins, cut off the circuit for protection, and resets and turns on when the temperature drops.
It achieves fast and reliable temperature protection, prevents fires from occurring, does not require replacement of plugs, is simple in structure and low in cost.
Smart Images
Figure CN223093247U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of power plugs, in particular to a plug with over-temperature protection. Background Art
[0002] With the development of technology and the improvement of the degree of electrification, the application of electricity in people's daily life and industrial production is becoming more and more extensive. However, there are also safety risks during the use of electricity, especially the fire accidents caused by overheating of electrical appliances, which pose a serious threat to personal and property safety.
[0003] Traditional power plugs usually consist of basic components such as a housing, a live wire terminal, and a neutral wire terminal, and are used to connect electrical equipment to a power socket. However, these traditional plugs often lack effective temperature monitoring and protection mechanisms. When an electrical appliance works for a long time or the circuit is abnormal, the plug part may overheat, thus causing a fire or other safety accidents.
[0004] There are also some plug designs on the market that incorporate temperature protection elements, such as thermal fuses or thermistors, to monitor the temperature of the plug and take corresponding protection measures. However, most of these designs have problems such as slow response speed, poor reliability, high cost, or complex structure, which limit their practical application scope; and when protected by a thermal fuse, the copper wire cannot be restored to a conducting path after melting.
[0005] The present utility model is made based on the above situation. Summary of the Utility Model
[0006] The utility model overcomes the deficiencies of the prior art and provides a plug with over-temperature protection. When the temperature reaches a preset value, the bimetallic strip generates a bending deformation, so that the moving contact disengages from the neutral pin or the live pin, thereby cutting off the circuit for protection.
[0007] The present utility model is realized through the following technical solutions:
[0008] A plug with over-temperature protection includes a housing, a live wire terminal, and a neutral wire terminal. The live wire terminal includes a first installation section, the front end of the first installation section is connected to a live pin, and the rear end of the first installation section is connected to a live wire joint. The neutral wire terminal includes a second installation section, the front end of the second installation section is connected to a neutral pin, and the rear end of the second installation section is connected to a neutral wire joint. The housing is provided with a first installation groove for installing the first installation section and a second installation groove for installing the second installation section. The live pin and the neutral pin both extend from the front side of the housing. A bimetallic strip for temperature control protection is provided on the first installation section and / or the second installation section, and an avoidance groove for providing space for its deformation is also provided on the housing at a position corresponding to the bimetallic strip.
[0009] A plug with over-temperature protection as described above, wherein the thermal bimetal sheet is arranged on the first installation section. The first installation section includes a front installation section and a rear installation section which are arranged at intervals. The front installation section is connected to the live pin, and the rear installation section is connected to the live wire connector. The fixed end of the thermal bimetal sheet is connected to the front installation section, and a moving contact is provided on the free end of the thermal bimetal sheet. When the preset temperature is not reached, the moving contact overlaps on the rear installation section, and when the preset temperature is reached, it leaves the rear installation section along with the deformation of the thermal bimetal sheet.
[0010] A plug with over-temperature protection as described above, an insulating block for connecting the front installation section and the rear installation section is arranged between the front installation section and the rear installation section. The fixed end of the thermal bimetal sheet is connected to the front installation section through a first fixed contact penetrating the insulating block. A second fixed contact penetrating the insulating block is arranged on the rear installation section. When the thermal bimetal sheet does not reach the preset temperature, the moving contact overlaps on the second fixed contact, and when the preset temperature is reached, it disengages from the second fixed contact along with the deformation of the thermal bimetal sheet.
[0011] A plug with over-temperature protection as described above, the live wire connector and the neutral wire connector extend out from the rear side of the housing, and U-shaped blocks for facilitating the connection of wires are connected to the rear ends of the live wire connector and the neutral wire connector.
[0012] A plug with over-temperature protection as described above, a first partition plate for separating the live wire connector and the neutral wire connector is arranged on the rear side surface of the housing.
[0013] A plug with over-temperature protection as described above, the housing includes an upper housing and a lower housing. The first installation groove, the second installation groove and the avoidance groove are arranged on the lower housing, and a second partition plate for separating the first installation section and the second installation section is arranged on the lower housing.
[0014] A plug with over-temperature protection as described above, a first limiting groove is arranged at the bottom of the rear end of the first installation groove, and a second limiting groove corresponding to the first limiting groove is arranged on the lower surface of the upper housing. A limiting pin for inserting into the first limiting groove and the second limiting groove is connected between the live wire connector and the first installation section.
[0015] A plug with over-temperature protection as described above, third limiting grooves are symmetrically arranged on the upper and lower parts of the live pin. A first limiting block for inserting into the third limiting groove at the lower part of the live pin is arranged on the bottom of the first installation groove, and a second limiting block for inserting into the third limiting groove at the upper part of the live pin is arranged on the upper housing; fourth limiting grooves are symmetrically arranged on the upper and lower parts of the neutral pin. A third limiting block for inserting into the fourth limiting groove at the lower part of the neutral pin is arranged on the bottom of the second installation groove, and a fourth limiting block for inserting into the fourth limiting groove at the upper part of the neutral pin is arranged on the upper housing.
[0016] A plug with over-temperature protection as described above, wherein a first positioning hole is provided on the upper end surface of the second partition plate, and a first positioning post that can be inserted into the first positioning hole is provided on the lower surface of the upper shell.
[0017] A plug with over-temperature protection as described above, wherein the outside of the shell is coated with a plastic insulating layer, a live wire is connected to the live wire connector and passes through the plastic insulating layer, and a neutral wire is connected to the neutral wire connector and passes through the plastic insulating layer.
[0018] Compared with the prior art, the present utility model has the following advantages:
[0019] 1. A thermal bimetal for temperature control protection is provided on the first installation section and / or the second installation section of this case. When the temperature reaches the preset value, the thermal bimetal generates a bending deformation, so that the moving contact disengages from the neutral pin or the live pin, thereby cutting off the circuit for protection, thus preventing the occurrence of fire. When the temperature is lower than the preset value, the thermal bimetal will reset and the circuit will be re-conducted without replacing the plug.
[0020] 2. Vibration or impact will be generated during the deformation and reset of the thermal bimetal. The live wire connector and the first installation section are limited by inserting the limiting pins into the first limiting groove and the second limiting groove, so as to reduce the influence of the deformation and reset of the thermal bimetal on the live wire connector and the first installation section, and make the live wire connector and the first installation section not easily shift. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The following further details the specific embodiments of the present utility model in conjunction with the drawings, wherein:
[0022] Figure 1 is a schematic structural diagram of the present utility model;
[0023] Figure 2 is a schematic structural diagram of the present utility model after removing the plastic insulating layer;
[0024] Figure 3 is a top view of the present utility model after removing the plastic insulating layer and the upper shell;
[0025] Figure 4 is an exploded view of the present utility model Figure 1 ;
[0026] Figure 5 is an exploded view of the present utility model Figure 2 ;
[0027] Figure 6 is a cross-sectional view of the present utility model;
[0028] Figure 7 is an exploded view of the live wire terminal in the present utility model. Detailed implementation mode
[0029] The present utility model will be further described below in conjunction with the accompanying drawings:
[0030] As Figures 1 to 7 shown, a plug with over-temperature protection includes a housing 1, a live wire terminal 2 and a neutral wire terminal 3. The live wire terminal 2 includes a first installation section 21. The front end of the first installation section 21 is connected to a live wire pin 22, and the rear end of the first installation section 21 is connected to a live wire connector 23. The neutral wire terminal 3 includes a second installation section 31. The front end of the second installation section 31 is connected to a neutral wire pin 32, and the rear end of the second installation section 31 is connected to a neutral wire connector 33. The housing 1 is provided with a first installation groove 11 for installing the first installation section 21 and a second installation groove 12 for installing the second installation section 31. The live wire pin 22 and the neutral wire pin 32 both extend from the front side of the housing 1. A thermal bimetal 4 for temperature control protection is provided on the first installation section 21 and / or the second installation section 31. A relief groove 50 for providing space for the deformation of the thermal bimetal 4 is also provided on the housing 1 at a position corresponding to the thermal bimetal 4. Among them, the housing 1 is made of insulating material.
[0031] In this case, the thermal bimetal 4 can be provided only on the first installation section 21; or the thermal bimetal 4 can be provided only on the second installation section 31. Of course, the thermal bimetal 4 can also be provided on both the first installation section 21 and the second installation section 31.
[0032] The thermal bimetal 4 is an element made by bonding two metals or alloys with different thermal expansion coefficients together. When this bimetal is subjected to temperature changes, due to the different degrees of expansion or contraction of the two layers of metal, it will produce bending deformation. Usually, one side of this structure is a metal with a higher coefficient of thermal expansion such as copper, brass or aluminum, and the other side is a metal with a lower coefficient of thermal expansion such as steel or nickel alloy.
[0033] In life, when the pin and the socket are in poor contact, or various other problems cause the temperature of the pin to rise, it is easy to cause fires or other various safety accidents. In this case, the thermal bimetal 4 for temperature control protection is provided on the first installation section 21 and / or the second installation section 31. When the temperature reaches the preset value, the thermal bimetal 4 produces bending deformation so that the moving contact 41 is separated from the neutral wire pin 32 or the live wire pin 22, thereby cutting off the circuit for protection, thus preventing the occurrence of fires. When the temperature is lower than the preset value, the thermal bimetal 4 will reset so that the circuit is re-conducted without having to replace the plug.
[0034] In some embodiments, the bimetal sheet 4 is disposed on the first mounting section 21, the first mounting section 21 includes a front mounting section 211 and a rear mounting section 212 which are spaced apart, the front mounting section 211 is connected to the live pin 22, the rear mounting section 212 is connected to the live wire connector 23, the fixed end of the bimetal sheet 4 is connected to the front mounting section 211, and a moving contact 41 is provided on the free end of the bimetal sheet 4 which overlaps the rear mounting section 212 when the preset temperature is not reached and leaves the rear mounting section 212 as the bimetal sheet 4 deforms when the preset temperature is reached. The second mounting section 31, the neutral pin 32, and the second mounting section 31 and the neutral wire connector 33 are integrally formed.
[0035] Specifically, an insulating block 5 for connecting the two is provided between the front mounting section 211 and the rear mounting section 212. The fixed end of the bimetal sheet 4 is connected to the front mounting section 211 through a first fixed contact 42 passing through the insulating block 5. A second fixed contact 6 passing through the insulating block 5 is provided on the rear mounting section 212. The moving contact 41 overlaps the second fixed contact 6 when the bimetal sheet 4 does not reach the preset temperature and disengages from the second fixed contact 6 as the bimetal sheet 4 deforms when the preset temperature is reached.
[0036] Further, the live wire connector 23 and the neutral wire connector 33 extend from the rear side of the housing 1, and a U-shaped block 7 facilitating the connection of wires is connected to the rear ends of the live wire connector 23 and the neutral wire connector 33. A first partition plate 13 capable of separating the live wire connector 23 and the neutral wire connector 33 is provided on the rear side surface of the housing 1, thereby restricting the generation of electric arcs between the live wire connector 23 and the neutral wire connector 33. Among them, the first partition plate 13 is integrally formed with the housing 1.
[0037] In some embodiments, the housing 1 includes an upper housing 15 and a lower housing 16. The first mounting groove 11, the second mounting groove 12, and the avoidance groove 50 are provided on the lower housing 16. A second partition plate 14 capable of separating the first mounting section 21 and the second mounting section 31 is provided on the lower housing 16. By the second partition plate 14, the generation of electric arcs between the bimetal sheet 4 and the neutral terminal 3 is restricted, improving the use safety performance of the product.
[0038] Further, a first limiting groove 111 is provided at the bottom of the rear end of the first mounting groove 11, and a second limiting groove 151 corresponding to the position of the first limiting groove 111 is provided on the lower surface of the upper housing 15. A limiting pin 20 capable of being inserted into the first limiting groove 111 and the second limiting groove 151 is connected between the live wire connector 23 and the first mounting section 21.
[0039] The deformation and reset of the bimetallic strip 4 will generate vibrations or impacts. The live wire connector 23 and the first mounting section 21 are limited by inserting the limiting pins 20 into the first limiting groove 111 and the second limiting groove 151, so as to reduce the influence of the vibrations generated by the deformation and reset of the bimetallic strip 4 on the live wire connector 23 and the first mounting section 21, and prevent the live wire connector 23 and the first mounting section 21 from being displaced easily.
[0040] Further, the upper and lower parts of the live wire pin 22 are symmetrically provided with third limiting grooves 221. There is a first limiting block 112 on the bottom of the first mounting groove 11 that can be inserted into the third limiting groove 221 at the lower part of the live wire pin 22, and a second limiting block 152 is provided on the upper housing 15 that can be inserted into the third limiting groove 221 at the upper part of the live wire pin 22. The upper and lower parts of the neutral wire pin 32 are symmetrically provided with fourth limiting grooves 321. There is a third limiting block 122 on the bottom of the second mounting groove 12 that can be inserted into the fourth limiting groove 321 at the lower part of the neutral wire pin 32, and a fourth limiting block 153 is provided on the upper housing 15 that can be inserted into the fourth limiting groove at the upper part of the neutral wire pin 32. Thus, the live wire terminal 2 and the neutral wire terminal 3 can be installed more firmly in the housing 1, preventing the internal live wire terminal 2 and neutral wire terminal 3 from being displaced during the use of the plug, which may affect the poor contact and generate a large amount of heat.
[0041] In some embodiments, the upper end surface of the second partition plate 14 is provided with a first positioning hole 141, and the lower surface of the upper housing 15 is provided with a first positioning post 154 that can be inserted into the first positioning hole 141. This facilitates the assembly and cooperation of the lower housing 16 and the upper housing 15.
[0042] In some embodiments, the outside of the housing 1 is coated with a plastic insulating layer 8. A live wire 91 is connected to the live wire connector 23 and passes through the plastic insulating layer 8, and a neutral wire 92 is connected to the neutral wire connector 33 and passes through the plastic insulating layer 8. The plastic insulating layer 8 is used to fix and protect the lower housing 16 and the upper housing 15.
Claims
1. A plug with over-temperature protection, characterized in that: It includes a housing (1), a live wire terminal (2) and a neutral wire terminal (3). The live wire terminal (2) includes a first installation section (21). A live wire pin (22) is connected to the front end of the first installation section (21), and a live wire joint (23) is connected to the rear end of the first installation section (21). The neutral wire terminal (3) includes a second installation section (31). A neutral wire pin (32) is connected to the front end of the second installation section (31), and a neutral wire joint (33) is connected to the rear end of the second installation section (31). The housing (1) is provided with a first installation groove (11) for installing the first installation section (21) and a second installation groove (12) for installing the second installation section (31). The live wire pin (22) and the neutral wire pin (32) both extend from the front side of the housing (1). A thermal bimetal sheet (4) for temperature control protection is provided on the first installation section (21) and / or the second installation section (31). A relief groove (50) for providing space for the deformation of the thermal bimetal sheet (4) is also provided on the housing (1) at a position corresponding to the thermal bimetal sheet (4).
2. The plug with over-temperature protection according to claim 1, characterized in that: The thermal bimetal sheet (4) is arranged on the first installation section (21). The first installation section (21) includes a front installation section (211) and a rear installation section (212) arranged at intervals. The front installation section (211) is connected to the live wire pin (22), and the rear installation section (212) is connected to the live wire joint (23). The fixed end of the thermal bimetal sheet (4) is connected to the front installation section (211), and a moving contact (41) which overlaps on the rear installation section (212) when the preset temperature is not reached and leaves the rear installation section (212) with the deformation of the thermal bimetal sheet (4) when the preset temperature is reached is provided on the free end of the thermal bimetal sheet (4).
3. The plug with over-temperature protection according to claim 2, wherein: An insulating block (5) for connecting the two is provided between the front installation section (211) and the rear installation section (212). The fixed end of the thermal bimetal sheet (4) is connected to the front installation section (211) through a first fixed contact (42) penetrating the insulating block (5). A second fixed contact (6) penetrating the insulating block (5) is provided on the rear installation section (212). The moving contact (41) overlaps on the second fixed contact (6) when the thermal bimetal sheet (4) does not reach the preset temperature and disengages from the second fixed contact (6) with the deformation of the thermal bimetal sheet (4) when the preset temperature is reached.
4. The plug with over-temperature protection according to claim 3, characterized in that: The live wire joint (23) and the neutral wire joint (33) extend from the rear side of the housing (1). U-shaped blocks (7) facilitating the connection of wires are connected to the rear ends of the live wire joint (23) and the neutral wire joint (33).
5. The plug with over-temperature protection according to claim 4, characterized in that: A first partition plate (13) capable of separating the live wire joint (23) and the neutral wire joint (33) is provided on the rear side surface of the housing (1).
6. A plug with over-temperature protection according to any one of claims 2-5, characterized in that: The housing (1) includes an upper housing (15) and a lower housing (16). The first installation groove (11), the second installation groove (12) and the relief groove (50) are arranged on the lower housing (16). A second partition plate (14) capable of separating the first installation section (21) and the second installation section (31) is provided on the lower housing (16).
7. The plug with over-temperature protection according to claim 6, characterized in that: A first limit groove (111) is provided at the bottom of the rear end of the first installation groove (11). A second limit groove (151) is provided on the lower surface of the upper housing (15) corresponding to the position of the first limit groove (111). A limit pin (20) capable of inserting into the first limit groove (111) and the second limit groove (151) is connected between the live wire connector (23) and the first installation section (21).
8. The plug with over-temperature protection according to claim 7, characterized in that: Third limit grooves (221) are symmetrically arranged on the upper and lower parts of the live wire pin (22). A first limit block (112) capable of inserting into the third limit groove (221) at the lower part of the live wire pin (22) is provided on the bottom of the first installation groove (11). A second limit block (152) capable of inserting into the third limit groove (221) at the upper part of the live wire pin (22) is provided on the upper housing (15); Fourth limit grooves (321) are symmetrically arranged on the upper and lower parts of the neutral wire pin (32). A third limit block (122) capable of inserting into the fourth limit groove (321) at the lower part of the neutral wire pin (32) is provided on the bottom of the second installation groove (12). A fourth limit block (153) capable of inserting into the fourth limit groove at the upper part of the neutral wire pin (32) is provided on the upper housing (15).
9. The plug with over-temperature protection according to claim 6, characterized in that: A first positioning hole (141) is provided on the upper end surface of the second partition plate (14). A first positioning post (154) capable of inserting into the first positioning hole (141) is provided on the lower surface of the upper housing (15).
10. A plug with over-temperature protection according to claim 1, characterized in that: A plastic insulation layer (8) is coated on the outside of the housing (1). A live wire (91) is connected to the live wire connector (23) and passes through the plastic insulation layer (8). A neutral wire (92) is connected to the neutral wire connector (33) and passes through the plastic insulation layer (8).