Over-current protector

Abstract

An overcurrent protector comprises a shell and an on-off assembly, the on-off assembly comprises a first conductive insertion piece, a second conductive insertion piece, a memory alloy piece and a button, one end of the memory alloy piece is fixedly conducted with the inner end of the first conductive insertion piece, and the other end of the memory alloy piece is provided with a movable contact arm. The shell comprises a front half shell and a rear half shell which are assembled, an installation through hole is formed in the top splicing position of the front half shell and the rear half shell and used for installing a fixing head, a penetrating hole is formed in the center of the fixing head, and the button is matched with the penetrating hole. The top of the fixing head is further provided with a first limiting part, the first limiting part is arranged around the penetrating hole, the outer wall face of the button is further provided with a second limiting part, the second limiting part and the first limiting part limit the button from being disengaged from the penetrating hole and are matched with the inner wall face of the penetrating hole in a sliding contact mode, and an elastic piece is further arranged between the first limiting part and the second limiting part. The device is simple in overall structure, convenient to install, high in sensitivity and safer to use.

Description

Technical Field

[0001] The utility model relates to the technical field of current protection, in particular to an overcurrent protector. Background Art

[0002] When a short circuit occurs in a line, one of the important characteristics is that the current in the line increases sharply. When the current flows through a certain predetermined value, the protective device that responds to the increase in current and operates is called overcurrent protection. Existing overcurrent protectors have low operational stability and poor sensitivity, which can easily cause safety hazards when used. Utility Model Content

[0003] In view of the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide an overcurrent protector which has a simple structure, is easy to install, has high sensitivity and is safer to use.

[0004] The utility model solves its technical problem by adopting a technical solution: an overcurrent protector, comprising a shell, and a switch assembly arranged on the shell, the switch assembly comprising a first conductive plug, a second conductive plug, a memory alloy sheet, and a button, one end of the memory alloy sheet is fixedly connected to the inner end of the first conductive plug, the other end of the memory alloy sheet is provided with a movable contact arm, the button makes the movable contact arm contact and conduct with the inner end of the second conductive plug, the shell comprises a front half shell and a rear half shell assembled together, the front half shell and the rear half shell are assembled at the top A mounting through hole is formed at the joint, and the mounting through hole is used to install a fixing head. A through hole is provided in the center of the fixing head. The button cooperates with the through hole to extend out of the top of the fixing head. A first limiting portion is also provided on the top of the fixing head. The first limiting portion is arranged around the through hole. A second limiting portion is also provided on the outer wall of the button. The second limiting portion and the first limiting portion limit the button from falling out of the through hole and slidingly cooperate with the inner wall of the through hole. An elastic member is also provided between the first limiting portion and the second limiting portion.

[0005] The advantages of adopting the above technical solution are: the first conductive plug and the second conductive plug are connected by pressing the movable contact arm of the memory alloy sheet by the button, and when the rated current is exceeded, the movable contact arm of the memory alloy sheet can automatically return to the initial state, so that the first conductive plug and the second conductive plug are disconnected, thereby achieving the function of overcurrent protection. The shell adopts the assembly method of the front half shell and the rear half shell, which facilitates the installation of the first conductive plug, the second conductive plug, the memory alloy sheet and the button. The setting of the fixed head of the first limiting part and the second limiting part on the button can realize the button. While preventing the button from falling out, the installation of the elastic part is also achieved. During installation, the elastic part is put on the button. Due to the setting of the second limiting part, the button is installed from the bottom of the fixed head. After installation, the elastic part can be limited between the first limiting part and the second limiting part. At the same time, the second limiting part and the insertion hole are in sliding contact. Under the joint action of the elastic part and the second limiting part, the up and down movement of the button will not be stuck, which ensures the stable swing of the movable contact arm and greatly improves the sensitivity. Therefore, the overall structure is simple, the installation is convenient, the sensitivity is high, and the product is safer to use.

[0006] Furthermore, a third limiting portion and a fourth limiting portion are provided at intervals above and below the peripheral wall surface of the fixing head, and the third limiting portion and the fourth limiting portion form installation limits with the inner and outer wall surfaces of the installation through hole respectively.

[0007] The advantages of adopting the above technical solution are: by setting the third limiting part and the fourth limiting part, the position of the fixing head on the installation through hole can be fixed, the fixing head is not easy to move up and down after installation, the fixing effect is good, the installation is convenient, and the structural design is reasonable.

[0008] Furthermore, a pair of first support parts and a pair of second support parts are formed inside the front half shell and the rear half shell, the first support parts are provided on the front and rear sides of the fourth limiting part, and the second support parts are provided on the front and rear sides below the second limiting part.

[0009] The advantages of adopting the above technical solution are: by setting a pair of first support parts, the installation of the fixed head is more stable, and the first support part is set to cooperate with the fourth limiting part, and the position is also reasonable. By setting a pair of second support parts, the movement of the button is smoother. At the same time, the second support part also has the purpose of limiting the downward movement of the second limiting part, thereby preventing the button from causing excessive force on the memory alloy sheet.

[0010] Furthermore, the fixing head is provided with an external thread on the peripheral wall surface above the third limiting portion, a circular fixing nut is connected to the external thread, and an anti-slip protrusion is formed on the peripheral wall surface of the fixing nut.

[0011] The advantages of adopting the above technical solution are: the overcurrent protector is fixed to the carrier through the external thread on the fixing head, the setting of the fixing nut makes the current protector have a good fixing effect, and the setting of the anti-slip protrusion makes the installation and disassembly of the fixing nut more convenient, thereby achieving the purpose of quick installation and disassembly of the overcurrent protector.

[0012] Furthermore, the front half shell and the back half shell form a first conductive insert slot and a second conductive insert slot at the bottom joint, the first conductive insert slot cooperates with the first conductive insert, and the second conductive insert slot cooperates with the second conductive insert.

[0013] Advantages of adopting the above technical solution: the first conductive insert slot and the second conductive insert slot are formed at reasonable positions, so that the first conductive insert and the second conductive insert can be quickly installed on the front half shell, making installation more convenient.

[0014] Furthermore, the interior of the front half shell is integrally formed with a first protrusion plate, a second protrusion plate, and a third protrusion plate. The mounting end of the memory alloy sheet is inserted on the inner side of the first protrusion plate. The second protrusion plate is arranged below the first protrusion plate and forms a clamping fixation for the inner end of the first conductive plug together with the first protrusion plate. The third protrusion plate is arranged on the right side of the second protrusion plate and forms a clamping fixation for the inner end of the second conductive plug together with the second protrusion plate.

[0015] The advantages of adopting the above technical solution are as follows: the memory alloy sheet is fixed by the first convex plate, the first conductive plug is fixed by the first convex plate and the second convex plate, and the second conductive plug is fixed by the second convex plate and the third convex plate, and is located on the front side of the front half shell, which is convenient for production assembly, speeds up production efficiency, and has a good fixing effect.

[0016] Furthermore, a pair of fourth protrusions and a pair of fifth protrusions are formed inside the front half shell and the rear half shell, first slots are respectively formed on both side surfaces of the inner end of the first conductive plug, and second slots are respectively formed on both side surfaces of the inner end of the second conductive plug, the fourth protrusions are respectively inserted into the corresponding first slots, and the fifth protrusions are respectively inserted into the corresponding second slots.

[0017] The advantages of adopting the above technical solution are: through the cooperation of the first slot and the fourth protrusion, the installation of the first conductive plug is more stable, and through the cooperation of the second slot and the fifth protrusion, the installation of the second conductive plug is more stable, ensuring stable conduction with the memory alloy sheet, and the structural setting is reasonable. At the same time, it also makes the assembly effect of the front half shell and the rear half shell better.

[0018] Furthermore, a sealing groove is formed around the wall surface of the front half shell at the joint, and a sealing rib is formed around the wall surface of the rear half shell at the joint, and the sealing rib is inserted into the sealing groove.

[0019] The advantages of adopting the above technical solution are: the high-frequency vibration waves generated by ultrasonic welding technology can fuse the sealing rib and the contact surface molecular layer of the sealing groove into one, so that the sealing effect after the front half shell and the rear half shell are assembled is good and the structure is reasonable.

[0020] Furthermore, the front half shell is provided with an insertion hole on the wall surface at the joint, and the rear half shell is provided with an insertion column on the wall surface at the joint. The insertion hole is provided in the sealing groove, and the insertion column cooperates with the insertion hole.

[0021] The advantages of adopting the above technical solution are: through the cooperation of the socket and the plug post, the assembly of the front half shell and the rear half shell is more stable, and at the same time the position of the socket is reasonably formed to ensure the sealing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 This is a cross-sectional view of the overall structure of the utility model;

[0024] Figure 3 This is a schematic diagram of the shell structure of the utility model;

[0025] Figure 4 This is another view of the housing structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the front half shell structure of the present utility model;

[0027] Figure 6 This is a schematic diagram of the rear half shell structure of the utility model;

[0028] Figure 7 It is a schematic diagram of some structural coordination of the utility model;

[0029] Figure 8 This is a schematic structural diagram of the first conductive plug and the second conductive plug of the present invention;

[0030] Figure 9 This is a cross-sectional view of the fixed head structure of the present utility model.

[0031] In the figure: 1-housing, 2-first conductive plug, 3-second conductive plug, 4-memory alloy sheet, 5-button, 6-movable contact arm, 7-front half shell, 8-back half shell, 9-mounting through hole, 10-mounting through hole, 11-through hole, 12-first limiting portion, 13-second limiting portion, 14-elastic member, 15-third limiting portion, 16-fourth limiting portion, 17-first supporting portion, 18-second supporting portion, 19-fixing nut, 20-first conductive plug slot, 21-second conductive plug slot, 22-first convex plate, 23-second convex plate, 24-third convex plate, 25-fourth convex plate, 26-fifth convex plate, 27-first slot, 28-first slot, 29-sealing groove, 30-sealing rib, 31-jack, 32-pin DETAILED DESCRIPTION

[0032] To more clearly illustrate the embodiments of the present invention and / or the technical solutions in the prior art, the following describes specific embodiments of the present invention with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of the present invention. A person skilled in the art can, without inventive effort, derive other drawings and other embodiments from these drawings. References to orientations only represent relative positional relationships between components, not absolute positional relationships.

[0033] See also Figures 1 to 9 As shown, an overcurrent protector includes a shell 1 and a switching assembly provided on the shell 1, the switching assembly includes a first conductive plug 2, a second conductive plug 3, a memory alloy sheet 4, and a button 5. The first conductive plug 2 and the second conductive plug 3 cooperate with the external positive and negative poles, one end of the memory alloy sheet 4 is fixedly connected to the inner end of the first conductive plug 2, and a movable contact arm 6 is provided on the other end of the memory alloy sheet 4. The button 5 makes the movable contact arm 6 contact and connect with the inner end of the second conductive plug 2. The movable contact arm 6 of the memory alloy sheet 4 is pressed down by the button 5 to realize the conduction of the first conductive plug 2 and the second conductive plug 3. In addition, by utilizing the characteristics of the memory alloy sheet 4, when the rated current is exceeded, the movable contact arm 6 can automatically return to the initial state, so that the first conductive plug 2 and the second conductive plug 3 are disconnected, thereby realizing the function of overcurrent protection.

[0034] In this embodiment, the shell 1 includes a front half shell 7 and a rear half shell 8 that are assembled together. The assembly method facilitates the installation of the first conductive plug 2, the second conductive plug 3, the memory alloy sheet 4 and the button 5. At the same time, the front half shell 7 and the rear half shell 8 form a mounting through hole 9 at the top joint. The mounting through hole 9 is used to install the fixing head 10. The center of the fixing head 10 is provided with a through hole 11. The button 5 is cylindrical. The cylindrical button 5 cooperates with the through hole 11 to extend out of the top of the fixing head 10. A first limiting portion 12 is further provided on the top of the fixing head 10. The first limiting portion 12 is arranged around the through hole 11. More specifically, the first limiting portion 12 is a limiting ring formed at the top of the inner wall of the through hole 11. A second limiting portion 13 is further provided on the outer wall surface of the button 5. The second limiting portion 13 is also a limiting ring and, together with the first limiting portion 12, limits the button 5 from escaping from the through hole 11. At the same time, the second limiting portion 1 3 also slides with the inner wall surface of the insertion hole 11, and an elastic member 14 is provided between the first limiting portion 12 and the second limiting portion 13. The setting of the fixing head 10 with the first limiting portion 12 and the second limiting portion 13 on the button 5 not only achieves the purpose of preventing the button 5 from falling out, but also realizes the installation of the elastic member 14. More specifically, during installation, the elastic member 14 is sleeved on the button 5. Due to the setting of the second limiting portion 13, the button 5 is installed from the bottom of the fixing head 10. After being installed in place, the elastic member 14 can be confined between the first limiting portion 12 and the second limiting portion 13. At the same time, the second limiting portion 13 slides with the insertion hole 11. Under the joint action of the elastic member 14 and the second limiting portion 13, the upward and downward movement of the button 5 will not be stuck, thereby ensuring the stable swing of the movable contact arm 6 and greatly improving the sensitivity. Therefore, the overall structure is simple, the installation is convenient, the sensitivity is high, and the use of the product is safer.

[0035] In this embodiment, a third limiting portion 15 and a fourth limiting portion 16 are provided at intervals in the upper and lower parts of the peripheral wall surface of the fixing head 10, and the third limiting portion 15 and the fourth limiting portion 16 respectively form installation limits with the inner and outer wall surfaces of the mounting through hole 9. More specifically, the third limiting portion 15 and the fourth limiting portion 16 are both hexagonal structures, and the length of the mounting through hole 9 is just adapted to the distance between the third limiting portion 15 and the fourth limiting portion 16. Therefore, by setting the third limiting portion 15 and the fourth limiting portion 16, the position of the fixing head 10 on the mounting through hole 9 can be fixed. After the fixing head 10 is installed, it is not easy to move up and down, the fixing effect is good, the installation is convenient, and the structural design is reasonable.

[0036] In this embodiment, a pair of first supporting portions 17 and a pair of second supporting portions 18 are formed inside the front half shell 7 and the rear half shell 8. The first supporting portions 17 are provided on the front and rear sides of the fourth limiting portion 16, and the second supporting portions 18 are provided on the front and rear sides below the second limiting portion 13 of the button 5. More specifically, during installation, the first supporting portion 17 and the second supporting portion 18 on the front half shell 7 are respectively placed on the lower parts of the fourth limiting portion 16 and the button 5. After the rear half shell 7 is installed, the two first supporting portions 17 can form a positioning for the fourth limiting portion 16, and the two second supporting portions 18 can form a positioning for the button 5. Therefore, by providing a pair of first supporting portions 17, the installation of the fixing head 10 is more stable, and the first supporting portion 17 is arranged to cooperate with the fourth limiting portion 16 to form a reasonable position. By providing a pair of second supporting portions 18, the movement of the button 5 is more stable. At the same time, the second supporting portion 18 also has the purpose of limiting the downward movement of the second limiting portion 13, thereby preventing the button from causing excessive force on the memory alloy sheet 4.

[0037] In this embodiment, the fixing head 10 is provided with an external thread on the peripheral wall surface above the third limiting portion 15, and a circular fixing nut 19 is connected to the external thread. An anti-slip protrusion is formed on the peripheral wall surface of the fixing nut 19. The overcurrent protector is fixed to the carrier through the external thread on the fixing head 10. The setting of the fixing nut 19 makes the current protector have a good fixing effect, and the setting of the anti-slip protrusion makes the installation and disassembly of the fixing nut 19 more convenient, thereby achieving the purpose of quick installation and disassembly of the overcurrent protector.

[0038] In this embodiment, the front half shell 7 and the rear half shell 8 form a first conductive plug slot 20 and a second conductive plug slot 21 at the bottom joint. The first conductive plug slot 20 cooperates with the first conductive plug 2, and the second conductive plug slot 21 cooperates with the second conductive plug 3. The positions of the first conductive plug slot 20 and the second conductive plug slot 21 are reasonable, so that the first conductive plug 2 and the second conductive plug 3 can be quickly installed on the front half shell 7, making installation more convenient.

[0039] In this embodiment, a first convex plate 22, a second convex plate 23, and a third convex plate 24 are integrally formed inside the front half shell 7. The mounting end of the memory alloy sheet 4 is inserted on the inner side of the first convex plate 22. The second convex plate 23 is arranged below the first convex plate 22 and forms a clamping fixation with the first convex plate 22 for the inner end of the first conductive plug 2. The third convex plate 24 is arranged on the right side of the second convex plate 23 and forms a clamping fixation with the second convex plate 23 for the inner end of the second conductive plug 3. The memory alloy sheet 4 is fixed by the first convex plate 22, and the first conductive plug 2 is fixed by the first convex plate 22 and the second convex plate 23. The second conductive plug 3 is fixed by the second convex plate 23 and the third convex plate 24. They are located on the front side of the front half shell 7, which is convenient for production assembly, speeds up production efficiency, and has a good fixing effect.

[0040] In this embodiment, a pair of fourth convex plates 25 and a pair of fifth convex plates 26 are further formed inside the front half shell 7 and the rear half shell 8. First slots 27 are respectively formed on both side surfaces of the inner end of the first conductive plug 2, and second slots 28 are respectively formed on both side surfaces of the inner end of the second conductive plug 3. The fourth convex plates 25 are respectively inserted into the corresponding first slots 27, and the fifth convex plates 26 are respectively inserted into the corresponding second slots 28. Through the cooperation of the first slots 27 and the fourth convex plates 25, the installation of the first conductive plug 2 is more stable. Through the cooperation of the second slots 28 and the fifth convex plates 26, the installation of the second conductive plug 3 is more stable, ensuring stable conduction with the memory alloy sheet 4. The structural setting is reasonable. At the same time, it also makes the assembly effect of the front half shell 7 and the rear half shell 8 good.

[0041] In this embodiment, a sealing groove 29 is formed around the wall surface of the joint at the front half shell 7, and a sealing rib 30 is formed around the wall surface of the joint at the rear half shell 8. The sealing rib 30 is inserted into the sealing groove 29. The high-frequency vibration wave generated by ultrasonic welding technology can make the sealing rib 30 and the contact surface molecular layer of the sealing groove 29 fuse into one, so that the sealing effect after the front half shell 7 and the rear half shell 8 are assembled is good and the structure is reasonable.

[0042] In this embodiment, a socket 31 is formed on the wall surface of the joint of the front half shell 7, and a pin 32 is formed on the wall surface of the joint of the rear half shell 8. The socket 31 is arranged in the sealing groove 29, and the pin 32 cooperates with the socket 31. Through the cooperation of the socket 32 ​​and the pin 31, the assembly of the front half shell 7 and the rear half shell 8 is more stable. At the same time, the position of the socket 32 ​​is reasonable to ensure the sealing.

[0043] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. An overcurrent protector, comprising a housing (1), and a switch assembly provided on the housing (1), wherein the switch assembly comprises a first conductive plug (2), a second conductive plug (3), a memory alloy sheet (4), and a button (5), wherein one end of the memory alloy sheet (4) is fixedly connected to the inner end of the first conductive plug (2), and a movable contact arm (6) is provided on the other end of the memory alloy sheet (4), and the button (5) causes the movable contact arm (6) to contact and connect with the inner end of the second conductive plug (3), characterized in that: The housing (1) comprises a front half shell (7) and a rear half shell (8) which are assembled together. A mounting through hole (9) is formed at the top where the front half shell (7) and the rear half shell (8) are assembled. The mounting through hole (9) is used to mount a fixing head (10). A through hole (11) is provided at the center of the fixing head (10). The button (5) cooperates with the through hole (11) to extend out of the top of the fixing head (10). The top of the fixing head (10) is also provided with a first A limiting portion (12), wherein the first limiting portion (12) is arranged around the insertion hole (11), and a second limiting portion (13) is further provided on the outer wall surface of the button (5), wherein the second limiting portion (13) and the first limiting portion (12) limit the button (5) from being disengaged from the insertion hole (11) and are in sliding contact with the inner wall surface of the insertion hole (11), and an elastic member (14) is further provided between the first limiting portion (12) and the second limiting portion (13).

2. The overcurrent protector according to claim 1, characterized in that: A third limiting portion (15) and a fourth limiting portion (16) are provided at intervals above and below the peripheral wall surface of the fixing head (10); the third limiting portion (15) and the fourth limiting portion (16) respectively form installation limits with the inner and outer wall surfaces of the installation through hole (9).

3. The overcurrent protector according to claim 2, characterized in that: A pair of first supporting portions (17) and a pair of second supporting portions (18) are formed inside the front half shell (7) and the rear half shell (8); the first supporting portions (17) are provided on the front and rear sides of the fourth limiting portion (16); and the button (5) is provided with the second supporting portions (18) on the front and rear sides below the second limiting portion (13).

4. The overcurrent protector according to claim 2, wherein: The fixing head (10) is provided with an external thread on the peripheral wall surface above the third limiting portion (15); a circular fixing nut (19) is connected to the external thread; and an anti-slip protrusion is formed on the peripheral wall surface of the fixing nut (19).

5. The overcurrent protector according to claim 1, characterized in that: The front half shell (7) and the rear half shell (8) are joined at the bottom to form a first conductive insert slot (20) and a second conductive insert slot (21); the first conductive insert slot (20) cooperates with the first conductive insert (2), and the second conductive insert slot (21) cooperates with the second conductive insert (3).

6. The overcurrent protector according to claim 5, characterized in that: The interior of the front half shell (7) is integrally formed with a first convex plate (22), a second convex plate (23), and a third convex plate (24); the mounting end of the memory alloy sheet (4) is inserted on the inner side of the first convex plate (22); the second convex plate (23) is arranged below the first convex plate (22) and forms a clamping fixation with the first convex plate (22) for the inner end of the first conductive plug (2); the third convex plate (24) is arranged on the right side of the second convex plate (23) and forms a clamping fixation with the second convex plate (23) for the inner end of the second conductive plug (3).

7. The overcurrent protector according to claim 6, characterized in that: A pair of fourth convex plates (25) and a pair of fifth convex plates (26) are further formed inside the front half shell (7) and the rear half shell (8); first slots (27) are respectively formed on both side surfaces of the inner end of the first conductive plug (2); second slots (28) are respectively formed on both side surfaces of the inner end of the second conductive plug (3); the fourth convex plates (25) are respectively inserted into the corresponding first slots (27), and the fifth convex plates (26) are respectively inserted into the corresponding second slots (28).

8. The overcurrent protector according to claim 1, characterized in that: The front half shell (7) is formed with a sealing groove (29) on the wall surface of the joint, and the rear half shell (8) is formed with a sealing rib (30) on the wall surface of the joint, and the sealing rib (30) is inserted into the sealing groove (29).

9. The overcurrent protector according to claim 8, characterized in that: The front half shell (7) is further formed with an insertion hole (31) on the wall surface of the joint, and the rear half shell (8) is further formed with an insertion column (32) on the wall surface of the joint. The insertion hole (31) is arranged in the sealing groove (29), and the insertion column (32) cooperates with the insertion hole (31).

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