Temperature controlled shut-off plug

Abstract

To provide a plug that cuts off a current in the event of overcurrent or overheating.SOLUTION: The present invention relates to the technical field of plugs, specifically to a temperature-controlled shut-off plug. The plug includes a body 1 and a lead end 2, the lead end 2 is fixed to a first end of the body 1 and having a live pin 21 and a neutral pin 22 at a second end of the body. An overheating and overcurrent protection unit is connected in series between the lead end 2 and the live pin 21 and / or between the lead end 2 and the neutral pin 22. The present invention has a rational structure, and the overheating and overcurrent protection unit is provided within the plug body. When an overcurrent or overheat occurs between the plug and socket due to poor contact or a short circuit in the circuit, the circuit between the lead end 2 and the pin is automatically cut off, thereby preventing the plug or socket from burning out and affecting the use of other electrical appliances.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to the technical field of plugs, and specifically to a temperature-controlled cut-off type plug.

Background Art

[0002] The commonly available power cord plugs on the market currently are manufactured by directly connecting two pins to the power cord (i.e., the live wire and the neutral wire) and injecting and molding PVC, and include pins, holders, and lead wires. One end of the pin is connected to one end of the lead wire inside the holder, and the other end is exposed outside the holder. It is used to insert into a power socket to introduce electricity and send power to electrical products through the lead wire. The holder insulates between each pin and insulates the charged part from the outside. To ensure the safety of electricity use, power supply circuits and electrical products are generally equipped with overload and short-circuit protection circuits. When a short circuit occurs, the main fuse of the power supply circuit blows, or the internal protection circuit of the electrical product shorts, affecting the use of other electrical products and normal production and lifespan.

[0003] Currently, the earth wire pin specifications of common three-phase plugs are generally of two types: cylindrical and flat. However, when in use, they lack versatility and it is necessary to carry multiple plugs. The applicability of the plugs is very poor. In particular, when the current plug assembles the lead wire end and the shell in a connection structure, it is necessary to bond them with an adhesive. When the plug is damaged, it can only be discarded, resulting in a waste of resources. In particular, plugs and sockets are likely to become loose and cause poor contact after long-term use. When energized, ignition may occur at the poor contact part, resulting in high temperature and the risk of burning of the plugs and sockets, and it may also cause a fire.

[0004] Therefore, there is room for improvement and development in the existing technology.

Summary of the Invention

Problems to be Solved by the Invention

[0005] The object of the present invention is to provide a temperature control and cut-off type plug with a reasonable structure, high compatibility, safety and controllability in view of the defects and drawbacks of the prior art.

Means for Solving the Problems

[0006] In order to achieve the above object, the present invention adopts the following technical solutions.

[0007] The temperature control and cut-off type plug of the present invention includes a main body and a lead wire end. The lead wire end is fixed to the first end of the main body, a live wire pin and a neutral wire pin are provided at the second end of the main body, and an overheat and overcurrent protection unit is connected in series between the lead wire end and the live wire pin and / or between the lead wire end and the neutral wire pin.

[0008] According to the above form, the overheat and overcurrent protection unit includes a terminal, a fixed tab and a bimetal sheet. The terminal and the fixed tab are fixedly connected by an insulating terminal. The first end of the bimetal sheet is fixedly connected to the fixed tab. A movable contact is provided at the second end of the bimetal sheet, a fixed contact is provided at the terminal, the live wire pin and the neutral wire pin are respectively fixedly connected to the corresponding fixed tabs, and the live wire and the neutral wire of the lead wire end are respectively connected to the terminals of the two overheat units.

[0009] According to the above form, a PTC element is bridge-connected between the terminal and the bimetal sheet.

[0010] According to the above form, the movable contact is welded to the bimetal sheet using a melting material, or the fixed contact is welded to the terminal using a melting material.

[0011] According to the above form, an earth wire pin is further provided on the main body.

[0012] According to the above form, the main body includes a housing and a positioning module. The housing has a hollow structure with an open upper end, and two positioning modules are provided within the upper opening of the housing. An engaging portion is formed in the positioning module, and the two positioning modules are symmetrically arranged. The two engaging portions form a pair to constitute a positioning opening. A throat groove is provided at the lead wire end, and the throat groove is snap-connected to the positioning opening to fix the lead wire end to the upper opening of the housing.

[0013] According to the above form, a plurality of limiting blocks are provided in the positioning module, and a hinge plate is provided on each of the live wire pin, neutral wire pin, and ground wire pin. A jack is provided on the lower end surface of the housing, and the live wire pin, neutral wire pin, and ground wire pin are inserted into the corresponding jacks. The limiting blocks of the two positioning modules are respectively in contact with and connected to the hinge plates on the live wire pin, neutral wire pin, and ground wire pin. According to the above form, fixing holes are provided in the positioning module, and the positioning module is fixedly connected to the housing by bolts and the fixing holes.

[0014] According to the above form, an assembly groove is provided in the limiting block paired with the ground wire pin. The ground wire at the end of the lead wire is fitted into the limiting block, extends into the assembly groove, and a high-speed exchange unit is provided at the upper end of the ground wire pin. The high-speed exchange unit includes a conductive sleeve and a conductive post. The conductive post is fixedly connected to the upper end of the ground wire pin and is movably inserted into the conductive sleeve. A conductive nail is provided on the upper end plate of the conductive sleeve, and a second disk is provided at the upper end of the conductive nail. The conductive sleeve is inserted into the assembly groove, and the second disk is brought into contact with the ground wire for electrical connection. A first locking structure is provided in the assembly groove. A slide rod is inserted into the upper end plate of the conductive sleeve. The lower end of the slide rod is fixedly connected to the conductive post. A first disk is provided at the upper end of the first slide rod. The first disk and the second disk are provided in pairs with the first locking structure respectively. A first spring is provided in the conductive sleeve, and the first spring abuts against the upper end plate of the conductive sleeve and the upper end surface of the conductive post.

[0015] According to the above form, the first locking structure includes a first guide rod and an inclined surface limiting base. First slide grooves are provided on the inner walls on both sides of the assembly groove. The first guide rod and an elastic element are provided in the first slide groove. The first end of the first guide rod is fixedly connected to the first assembly groove. The inclined surface limiting base is slidably provided at the second end of the first guide rod. The elastic element abuts against the inclined surface limiting base to snap-connect the inclined surface limiting base to the first disk.

[0016] According to the above embodiment, a second locking structure is provided between the ground wire pin and the housing. The second locking structure includes a second slide groove, a second guide rod, and a stator tongue. The second slide groove is provided on the housing on the side of the conductive post. The conductive post is provided with a first locking groove that pairs with the second slide groove. A second guide rod and an elastic element are provided in the second slide groove. The first end of the second guide rod is fixedly connected to the second slide groove. The stator tongue is slidably provided at the second end of the second guide rod. The elastic element presses against the stator tongue to snap-connect the stator tongue to the first locking groove.

[0017] According to the above embodiment, an auxiliary pairing structure is provided between the positioning module and the lead wire end. The auxiliary pairing structure includes a driving slider, a third guide rod, and a wedge driving head. A lock box is provided at the upper end of the positioning module. The third guide rod is fixedly provided in the lock box. The driving slider is slidably connected to the third guide rod. An opening groove is provided on the upper end surface of the lock box. A second locking groove is provided in the throat groove. A lock head is provided at one end of the lock box. The lock head is inserted into the engaging portion. An elastic buckle is provided on the lock head. The wedge driving head and the driving slider are fixedly connected by a synchronization link. An elastic element is provided in the lock box. The elastic element presses against the driving slider to fit-connect the wedge driving head and the elastic buckle.

[0018] According to the above embodiment, an auxiliary assembly structure is provided between the positioning module and the housing. The auxiliary assembly structure includes a ball, a rubber block, and an elastic element. The positioning module is provided with a third locking groove. The first end of the third locking groove penetrates the outer wall of the positioning module. A limiting concave groove is provided on the inner wall of the housing. The rubber block and the ball are inserted into the port at the first end of the third locking groove. An elastic element is provided in the third locking groove. The elastic element biases the rubber block and the ball towards the limiting concave groove.

[0019] According to the above form, an adjustment screw is provided at the second end of the third locking groove. The adjustment screw is screwed into the third locking groove, a pressure adjustment plate is provided in the third locking groove, one end of the adjustment screw is fitted and connected to the pressure adjustment plate, and the elastic element is provided between the pressure adjustment plate and the rubber block.

Advantages of the Invention

[0020] The beneficial effects of the present invention are as follows. The present invention has a reasonable structure, and an overheat and overcurrent protection unit is provided inside the plug body. Therefore, when there are problems such as poor contact or short circuit in the circuit, or when overcurrent and overheat occur between the plug and the socket, the circuit between the lead wire end and the pin is automatically cut off, preventing the plug or socket from burning out and affecting the use of other electrical products.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Embodiments for Carrying out the Invention

[0022] Hereinafter, the technical embodiments of the present invention will be described with reference to the drawings and examples.

[0023] As shown in FIGS. 1 to 2, the temperature control cut-off type plug described in the present invention includes a main body 1 and a lead wire end 2. The lead wire end 2 is fixed to the first end of the main body 1, and a live pin 21 and a neutral pin 22 are provided at the second end of the main body 1. An earth wire pin 23 is further provided on the main body 1. An overheat and overcurrent protection unit is connected in series between the lead wire end 2 and the live pin 21 and / or between the lead wire end 2 and the neutral pin 22. The main body 1 incorporates an overheat and overcurrent protection unit for connecting the lead wire end 2, the live pin 21, and the neutral pin 22 in series. When the plug main body 1 is inserted into a socket to supply power to an electrical product, if a poor contact or a load short circuit occurs between the plug and the socket, resulting in an excessive current or a too high temperature, the overheat and overcurrent protection unit responds in a timely manner and cuts off the current path at the live pin 21 or the neutral pin 22 to avoid burning of the plug main body 1 and the socket. Furthermore, the overheat and overcurrent protection unit can be reset and powered on again only when the power supply by the plug main body 1 is stopped for troubleshooting, thus avoiding frequent interruption of the main brake of the power supply and preventing other electrical devices from becoming unusable, so as not to affect daily life.

[0024] The overheat and overcurrent protection unit includes a terminal 3, a fixed tab 31, and a bimetal sheet 32. The terminal 3 and the fixed tab 31 are fixedly connected by an insulating terminal 33. The first end of the bimetal sheet 32 is fixedly connected to the fixed tab 31. A movable contact 34 is provided at the second end of the bimetal sheet 32, and a fixed contact 35 is provided on the terminal 3. The live wire pin 21 and the neutral wire pin 22 are fixedly connected to the corresponding fixed tabs 31 respectively. The live wire and the neutral wire at the lead wire end 2 are connected to the terminals 3 of the two overheat units respectively. The live wire at the lead wire end 2 is welded to the terminal 3 and connected in series with the live wire pin 21 by the overheat and overcurrent protection unit. Similarly, the neutral wire welding terminal 3 at the lead wire end 2 is connected in series with the neutral wire pin 22 by the overheat and overcurrent protection unit. Once an overload or short circuit occurs in the circuit between the electrical product, the plug and the socket, especially when there is poor contact between the plug and the socket, when using the electrical product, it may catch fire or the temperature may rise at the contact part between the plug and the socket. At this time, the bimetal sheet 32 instantaneously responds and deforms to cut off the path between the movable contact 34 and the fixed contact 35, thereby cutting off the current and protecting the plug body 1 and the socket. Preferably, two sets of overheat and overcurrent protection units are provided in the plug body 1, thereby obtaining double protection and better safety.

[0025] A PTC element 4 is bridge-connected between the terminal 3 and the bimetal sheet 32. The resistance value of the PTC element 4 is much higher than that of the bimetal sheet 32. In a normal state, the PTC element 4 and the bimetal sheet 32 are connected in parallel. Since the voltage drop of the PTC element 4 is extremely small and it does not operate, it does not generate heat. When high temperature or short circuit occurs due to poor contact, the bimetal sheet 32 jumps to cut off the path between the movable contact 34 and the fixed contact 35, so that the PTC element 4 reaches the operating voltage, and the PTC element 4 generates heat to maintain the thermal change state of the bimetal sheet 32. Therefore, before the plug body 1 is reused, it is necessary to cut off the power to cool down the PTC element 4. Thereby, the function of power failure reset is realized, and the situation that the power supply circuit trips when the electrical equipment is restarted in a state where the fault has not been eliminated can be avoided.

[0026] The movable contact 34 is welded to the bimetal sheet 32 using a melting material, or the fixed contact 35 is welded to the terminal 3 using a melting material. The melting material can play a role in fusing. When the overcurrent / overheat protection unit fails, the melting material of the movable contact 34 or the fixed contact 35 becomes inoperative, and both of them are detached to cause a forced power outage, thereby ensuring the safety of the protection socket, the electrical product, and the entire power supply circuit.

[0027] The main body 1 includes a housing 11 and a positioning module 12. The housing 11 has a hollow structure with an open upper end. Two positioning modules 12 are provided within the upper opening of the housing 11. An engaging portion is formed in the positioning module 12. The two positioning modules 12 are symmetrically arranged, and the two engaging portions form a pair to constitute a positioning opening 13. A throat groove 24 is provided on the lead wire end 2. The throat groove 24 is snap-connected to the positioning opening 13 to fix the lead wire end 2 to the upper opening of the housing 11. The housing 11 adopts an injection molding process, has insulation properties, and houses an overheat and overcurrent protection unit and a circuit inside. The lead wire end 2 is first welded to the terminal 3, forms a pair with the two positioning modules 12 through the throat groove 24. A jack 15 is provided on the lower end surface of the housing 11. The live wire pin 21, neutral wire pin 22, and ground wire pin 23 form a pair with the jack 15 of the housing 11 and are integrally mounted on the upper opening of the housing 11. Fixing holes 16 are provided in the positioning module 12. The positioning module 12 is fixedly connected to the housing 11 by bolts and the fixing holes 16, thereby enabling efficient installation.

[0028] A plurality of limiting blocks 14 are provided in the positioning module 12. A hinge plate 25 is provided on each of the live wire pin 21, neutral wire pin 22, and ground wire pin. A jack 15 is provided on the lower end surface of the housing 11. The live wire pin 21, neutral wire pin 22, and ground wire pin are inserted into the corresponding jack 15. The limiting blocks 14 of the two positioning modules 12 are respectively in contact with and connected to the hinge plates 25 on the live wire pin 21, neutral wire pin 22, and ground wire pin. The limiting blocks 14 are respectively in contact with the hinge plates 25 to limit the above-mentioned live wire pin 21, neutral wire pin 22, and ground wire pin within the housing 11, prevent their loosening, improve the stability of the overheat and overcurrent protection unit, and extend the service life of the product.

[0029] As shown in FIG. 3, an assembly groove 231 is provided in the limiting block 14 paired with the ground wire pin 23. The ground wire of the lead wire end 2 is fitted into the limiting block 14, extends into the assembly groove 231, and a high-speed exchange unit is provided at the upper end of the ground wire pin 23. The high-speed exchange unit includes a conductive sleeve 232 and a conductive post 233. The conductive post 233 is fixedly connected to the upper end of the ground wire pin 23, and the conductive post 233 is movably inserted into the conductive sleeve 232. A conductive nail 234 is provided on the upper end plate of the conductive sleeve 232, and a second disk 235 is provided at the upper end of the conductive nail 234. The conductive sleeve 232 is inserted into the assembly groove 231, and the second disk 235 is brought into contact with the ground wire for electrical connection. A first locking structure is provided in the assembly groove 231. A slide rod 236 is inserted through the upper end plate of the conductive sleeve 232. The lower end of the slide rod 236 is fixedly connected to the conductive post 233, and a first disk 237 is provided at the upper end of the first slide rod 236. The first disk 237 and the second disk 235 are provided in pairs with the first locking structure respectively. A first spring 238 is provided in the conductive sleeve 232, and the first spring 238 abuts against the upper end plate of the conductive sleeve 232 and the upper end surface of the conductive post 233. The shown ground wire pin 23 can be removed and exchanged by the high-speed exchange unit. The conductive sleeve 232 and the conductive post 233 are assembled to the ground wire pin 23, and an assembly groove 231 is opened in the corresponding limiting block 14. When the ground wire pin 23 is mounted, the second disk 235 is inserted into the assembly groove 231, and the first locking structure locks the second disk 235 to bring the second disk 235 into contact with the ground wire of the lead wire end 2 for electrical connection. The second disk 235, the conductive nail 234, the conductive sleeve 232, the conductive post 233, and the ground wire pin 23 are connected in this order to form a ground line.

[0030] When removing the ground wire pin 23, the ground wire pin 23 is pushed upward along the vertical direction, the conductive post 233 drives the first disk 237 by the first slide rod 236, the first disk 237 presses the first locking structure to release the lock, and then the second disk 235 slides to one side from the assembly groove 231, whereby the ground wire pin 23 is removed from the limiting block 14.

[0031] As shown in FIGS. 3 to 10, specifically, the first locking structure includes a first guide rod 141 and an inclined surface limiting base 142. First slide grooves 143 are provided on the inner walls on both sides of the assembly groove 231. The first guide rod 141 and an elastic element are provided in the first slide groove 143. The first end of the first guide rod 141 is fixedly connected to the first assembly groove 231. The inclined surface limiting base 142 is slidably provided at the second end of the first guide rod 141. The elastic element presses against the inclined surface limiting base 142 to snap-connect the inclined surface limiting base 142 to the first disk 237. The inclined surface limiting base 142 is movable along the lateral direction of the first guide rod 141. The elastic element may be a spring. The elastic element always biases the inclined surface limiting base 142 towards the conductive nail 234. When the second disk 235 is installed, the inclined surface limiting base 142 presses against the second disk 235 to release the lock. When the conductive post 233 drives the first disk 237 to move upward, the first disk 237 presses the inclined surface of the inclined surface limiting base 142 to generate a lateral pushing force against the acting force of the elastic element, retracting the inclined surface limiting base 142 into the first slide groove 143 to release the lock on the second disk 235.

[0032] A second locking structure is provided between the ground wire pin 23 and the housing 11. The second locking structure includes a second slide groove 110, a second guide rod 111, and a stator tongue 112. The second slide groove 110 is provided in the housing 11 on the side of the conductive post 233. The conductive post 233 is provided with a first locking groove 239 that pairs with the second slide groove 110. A second guide rod 111 and an elastic element are provided in the second slide groove 110. The first end of the second guide rod 111 is fixedly connected to the second slide groove 110. The stator tongue 112 is slidably provided at the second end of the second guide rod 111. The elastic element presses against the stator tongue 112 to snap-connect the stator tongue 112 to the first locking groove 239. Preferably, the conductive nail 234 is inserted into the first disk 237, and the conductive nail 234 and the conductive sleeve 232 are relatively rotatable. Further, when removing the ground wire pin 23, when the ground wire pin 23 is rotated to press the stator tongue 112 with the conductive post 233, the stator tongue 112 is retracted into the second slide groove 110 under pressure and slides over the first locking groove 239. Thereby, the second locking structure releases the lock on the ground wire pin 23, and the ground wire pin 23 slides upward to release the lock by the first locking structure.

[0033] An auxiliary pairing structure is provided between the positioning module 12 and the lead wire end 2. The auxiliary pairing structure includes a driving slider 121, a third guide rod 122, and a wedge-shaped driving head 123. A lock box 120 is provided at the upper end of the positioning module 12. The third guide rod 122 is fixedly provided in the lock box 120. The driving slider 121 is slidably connected to the third guide rod 122. An opening groove is provided on the upper end surface of the lock box 120. A second lock groove 241 is provided in the throat groove 24. A lock head 124 is provided at one end of the lock box 120. The lock head 124 is inserted into the engaging portion, and an elastic buckle 125 is provided on the lock head 124. The wedge-shaped driving head 123 and the driving slider 121 are fixedly connected by a synchronization link 126. An elastic element is provided in the lock box 120. The elastic element presses against the driving slider 121 to fit and connect the wedge-shaped driving head 123 and the elastic buckle 125. The auxiliary pairing structure is used to efficiently assemble the positioning module 12 and the lead wire end 2. Two positioning modules 12 sandwich the lead wire end 2 from both sides. The throat groove 24 and the positioning opening 13 are paired for snap-fitting. The lock head 124 of the lock box 120 is inserted into the throat groove 24. The elastic element drives the wedge-shaped driving head 123 to press the elastic buckle 125. The elastic buckle 125 is snap-connected to the second lock groove 241. Thereby, the positioning module 12 and the lead wire end 2 are efficiently connected and are easily assembled in the housing 11. Of course, when it is necessary to maintain the members in the housing 11, since a hole for the opening groove is opened in the driving slider 121, the driving slider 121 can be pushed using a small tool to separate it from the lock head 124. The synchronization link 126 drives the wedge-shaped driving head 123 to separate it from the elastic buckle 125. The elastic buckle 125 can be reset and removed from the second lock groove 241 to separate the positioning module 12 and the lead wire end 2.

[0034] An auxiliary assembly structure is provided between the positioning module 12 and the housing 11. The auxiliary assembly structure includes a ball 127, a rubber block 128, and an elastic element. A third locking groove 129 is provided in the positioning module 12. The first end of the third locking groove 129 penetrates the outer wall of the positioning module 12. A limiting concave groove 113 is provided on the inner wall of the housing 11. The rubber block 128 and the ball 127 are inserted into the port at the first end of the third locking groove 129. An elastic element is provided in the third locking groove 129. The elastic element biases the rubber block 128 and the ball 127 towards the limiting concave groove 113. The positioning module 12 and the lead wire end 2 are of an integral structure and are mounted from the upper opening of the housing 11. The ball 127 and the limiting concave groove 113 form a pair. The elastic element drives the outer end of the rubber block 128 to abut against the inner wall of the housing 11. The ball 127 is engaged with the limiting concave groove 113, and the vertical position between the positioning module 12 and the housing 11 is locked. Such a locking method is elastic. When the vertical acting force between the positioning module 12 and the housing 11 is large, the ball 127 and the limiting concave groove 113 are separated against the elastic element, thus facilitating subsequent removal and maintenance.

[0035] An adjusting screw 114 is provided at the second end of the third locking groove 129. The adjusting screw 114 is screwed into the third locking groove 129. A pressure adjusting plate 115 is provided in the third locking groove 129. One end of the adjusting screw 114 is fitted and connected to the pressure adjusting plate 115. The elastic element is provided between the pressure adjusting plate 115 and the rubber block 128. Furthermore, the frictional force between the rubber block 128 and the inner wall of the housing 11 and the degree of fitting between the ball 127 and the limiting concave groove 113 can be adjusted by the adjusting screw 114. The acting force of the elastic element can be changed by turning the adjusting screw 114 to move the pressure adjusting plate 115 closer to or away from the ball 127. It should be noted that the elastic element is a spring.

[0036] The above are only better embodiments of the present invention. Therefore, all equivalent changes or modifications made based on the structures, features, and principles described in the scope of the patent application of the present invention shall be included in the scope of the patent application of the present invention.

Description of Reference Numerals

[0037] 1 Main body 2 Lead wire end 3 Terminal 4 PTC element 11 Housing 12 Positioning module 13 Positioning port 14 Limiting block 15 Jack 16 Fixing hole 21 Live wire pin 22 Neutral wire pin 23 Earth wire pin 24 Throat groove 25 Hinge plate 31 Fixing tab 32 Bimetal sheet 33 Insulating terminal 34 Movable contact 35 Fixed contact 110 Second slide groove 111 Second guide rod 112 Stat tongue 113 Limiting concave groove 114 Adjusting screw 115 Pressure adjusting plate 120 Lock box 121 Driving slider 122 Third guide rod 123 Wedge driving head 124 Lock head 125 Elastic buckle 126 Synchronization link 127 Ball 128 Rubber block 129 Third lock groove 141 First guide rod 142 Inclined plane limiting base 143 First slide groove 231 Assembly groove 232 Conductive sleeve 233 Conductive post 234 Conductive nail 235 Second disk 236 Slide rod 237 First disk 238 First spring 239 First lock groove 241 Second lock groove

Claims

Claim 1 A temperature-controlled cut-off type plug including a main body (1) and a lead wire end (2), wherein the lead wire end (2) is fixed to the first end of the main body (1), a live wire pin (21) and a neutral wire pin (22) are provided at the second end of the main body (1), and an overheat / overcurrent protection unit is connected in series between the lead wire end (2) and the live wire pin (21) and / or between the lead wire end (2) and the neutral wire pin (22). A temperature-controlled cut-off type plug characterized by this. Claim 2 The overheat / overcurrent protection unit includes a terminal (3), a fixed tab (31), and a bimetal sheet (32). The terminal (3) and the fixed tab (31) are fixedly connected by an insulating terminal (33). The first end of the bimetal sheet (32) is fixedly connected to the fixed tab (31). A movable contact (34) is provided at the second end of the bimetal sheet (32), and a fixed contact (35) is provided on the terminal (3). The live wire pin (21) and the neutral wire pin (22) are fixedly connected to the corresponding fixed tabs (31) respectively. The live wire and the neutral wire of the lead wire end (2) are connected to the terminals (3) of the two overheat units respectively. The temperature-controlled cut-off type plug according to Claim 1, characterized by this. Claim 3 A PTC element (4) is bridge-connected between the terminal (3) and the bimetal sheet (32). The temperature-controlled cut-off type plug according to Claim 2, characterized by this. Claim 4 The movable contact (34) is welded to the bimetal sheet (32) using a melting material, or the fixed contact (35) is welded to the terminal (3) using a melting material. The temperature-controlled cut-off type plug according to Claim 2, characterized by this. Claim 5 An earth wire pin (23) electrically connected to the lead wire end (2) is further provided at the second end of the main body (1). The temperature-controlled cut-off type plug according to any one of Claims 1 to 3, characterized by this. Claim 6 The main body (1) includes a housing (11) and a positioning module (12). The housing (11) has a hollow structure with an open upper end. Two positioning modules (12) are provided within the upper opening of the housing (11). An engaging portion is formed on the positioning module (12). The two positioning modules (12) are symmetrically arranged, and the two engaging portions form a pair to constitute a positioning opening (13). A throat groove (24) is provided on the lead wire end (2). The throat groove (24) is snap-connected to the positioning opening (13) to fix the lead wire end (2) to the upper opening of the housing (11). The temperature control cut-off type plug according to claim 1, characterized in that.

7. A plurality of limiting blocks (14) are provided on the positioning module (12). A hinge plate (25) is provided on each of the live wire pin (21), neutral wire pin (22), and ground wire pin (23). A jack (15) is provided on the lower end surface of the housing (11). The live wire pin (21), neutral wire pin (22), and ground wire pin (23) are inserted into the corresponding jacks (15). The limiting blocks (14) of the two positioning modules (12) are respectively in contact with and connected to the hinge plates (25) on the live wire pin (21), neutral wire pin (22), and ground wire pin (23). The temperature control cut-off type plug according to claim 6, characterized in that.

8. A fixing hole (16) is provided on the positioning module (12). The positioning module (12) is fixedly connected to the housing (11) by bolts and the fixing hole (16). The temperature control cut-off type plug according to claim 7, characterized in that.

9. An assembly groove (231) is provided in the limiting block (14) paired with the ground wire pin (23). The ground wire of the lead wire end (2) is fitted into the limiting block (14), extends into the assembly groove (231), and a high-speed exchange unit is provided at the upper end of the ground wire pin (23). The high-speed exchange unit includes a conductive sleeve (232) and a conductive post (233). The conductive post (233) is fixedly connected to the upper end of the ground wire pin (23), and the conductive post (233) is movably inserted into the conductive sleeve (232). A conductive nail (234) is provided on the upper end plate of the conductive sleeve (232), and a second disk (235) is provided at the upper end of the conductive nail (234). The conductive sleeve (232) is inserted into the assembly groove (231), and the second disk (235) is brought into contact with the ground wire for electrical connection. A first locking structure is provided in the assembly groove (231). A slide rod (236) is inserted into the upper end plate of the conductive sleeve (232). The lower end of the slide rod (236) is fixedly connected to the conductive post (233), and a first disk (237) is provided at the upper end of the first slide rod (236). The first disk (237) and the second disk (235) are respectively provided in pairs with the first locking structure. A first spring (238) is provided in the conductive sleeve (232), and the first spring (238) abuts against the upper end plate of the conductive sleeve (232) and the upper end surface of the conductive post (233). The temperature control cut-off type plug according to claim 7, characterized in that.

10. The first locking structure includes a first guide rod (141) and an inclined surface limiting base (142). First slide grooves (143) are provided on the inner walls on both sides of the assembly groove (231). The first guide rod (141) and an elastic element are provided in the first slide groove (143). The first end of the first guide rod (141) is fixedly connected to the first assembly groove (231). The inclined surface limiting base (142) is slidably provided at the second end of the first guide rod (141). The elastic element abuts against the inclined surface limiting base (142) to snap-connect the inclined surface limiting base (142) to the first disk (237). The temperature control cut-off type plug according to claim 9, characterized in that.

11. A second locking structure is provided between the ground wire pin (23) and the housing (11). The second locking structure includes a second slide groove (110), a second guide rod (111), and a stator tongue (112). The second slide groove (110) is provided in the housing (11) on the side of the conductive post (233). A first locking groove (239) that pairs with the second slide groove (110) is provided in the conductive post (233). A second guide rod (111) and an elastic element are provided in the second slide groove (110). The first end of the second guide rod (111) is fixedly connected to the second slide groove (110). The stator tongue (112) is slidably provided at the second end of the second guide rod (111). The elastic element presses against the stator tongue (112) to snap-connect the stator tongue (112) to the first locking groove (239). The temperature control cut-off type plug according to claim 9, characterized in that.

12. An auxiliary pairing structure is provided between the positioning module (12) and the lead wire end (2). The auxiliary pairing structure includes a driving slider (121), a third guide rod (122), and a wedge driving head (123). A lock box (120) is provided at the upper end of the positioning module (12). The third guide rod (122) is fixedly provided in the lock box (120). The driving slider (121) is slidably connected to the third guide rod (122). An opening groove is provided on the upper end surface of the lock box (120). A second locking groove (241) is provided in the throat groove (24). A lock head (124) is provided at one end of the lock box (120). The lock head (124) is inserted into the engaging portion. An elastic buckle (125) is provided on the lock head (124). The wedge driving head (123) and the driving slider (121) are fixedly connected by a synchronization link (126). An elastic element is provided in the lock box (120). The elastic element presses against the driving slider (121) to fit-connect the wedge driving head (123) and the elastic buckle (125). The temperature control cut-off type plug according to claim 6, characterized in that.

13. An auxiliary assembly structure is provided between the positioning module (12) and the housing (11). The auxiliary assembly structure includes a ball (127), a rubber block (128), and an elastic element. A third locking groove (129) is provided in the positioning module (12). The first end of the third locking groove (129) penetrates the outer wall of the positioning module (12). A limiting concave groove (113) is provided in the inner wall of the housing (11). The rubber block (128) and the ball (127) are inserted into the port at the first end of the third locking groove (129). An elastic element is provided in the third locking groove (129). The elastic element biases the rubber block (128) and the ball (127) towards the limiting concave groove (113). The temperature control cut-off type plug according to claim 5, characterized in that.

14. An adjusting screw (114) is provided at the second end of the third locking groove (129). The adjusting screw (114) is screwed into the third locking groove (129). A pressure adjusting plate (115) is provided in the third locking groove (129). One end of the adjusting screw (114) is fitted and connected to the pressure adjusting plate (115). The elastic element is provided between the pressure adjusting plate (115) and the rubber block (128). The temperature control cut-off type plug according to claim 13, characterized in that.

Images