A high-temperature fast-response temperature protector

Abstract

The present invention relates to the technical field of thermal protectors, and in particular to a high-temperature, fast-response temperature protector, wherein a first lead and a second lead sequentially form a circuit path through a moving contact piece, a moving contact, a static contact, and a base plate, and sense changes in circuit temperature through a temperature sensing element and bends when a threshold value is reached. The bending deformation of the temperature sensing element is converted into mechanical power to push the top column to move and lift the moving contact piece, thereby separating the connection between the moving contact and the static contact on it, thereby disconnecting the circuit. The shell serves as the external support structure of the protector to ensure stable installation and effective heat dissipation of the internal components. Among the internal components of the shell, the base plate and the moving contact are respectively located on the upper and lower sides of the fixing base. The top column and the fixing base arranged in the fixing base are both made of insulating materials. The fixing base is integrally formed of ceramic material to improve the heat resistance of the temperature protector. The temperature sensing element is arranged on one side of the fixing base and monitors the temperature at the bottom plate to ensure accurate monitoring of the circuit temperature and rapid response.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal protectors, in particular to a high-temperature fast-response thermal protector. Background Art

[0002] During the operation of electrical circuits, short circuits, excessive loads, and other factors can cause overheating. Failure to promptly shut down power can not only damage the circuits but also lead to serious consequences such as fires. To address this issue, thermal protectors are often integrated into circuits to monitor and control circuit temperature, ensuring that they are disconnected promptly in the event of an abnormal temperature rise, thereby protecting both electrical equipment and personnel.

[0003] Traditional thermal protectors offer some protection against circuit overheating. They disconnect the circuit in the event of an overheat by working together with a built-in thermocouple and a moving contact. The thermocouple is made of two metal sheets with different thermal expansion coefficients bonded together. This differential in thermal expansion causes the thermocouple to bend, which in turn moves the moving contact, disconnecting the circuit. When the temperature drops, the thermocouple returns to its original shape, causing the moving contact to reset and reclose the circuit.

[0004] At present, the bimetallic strip in the temperature protector is usually set in the middle position of the shell and is generally suspended in the air, which causes the bimetallic strip to respond less sensitively in the case of overheating; secondly, the insulating plate currently set in the temperature protector is made of plastic material, which is easy to deform in the case of overheating, reducing the temperature resistance and service life of the protector.

[0005] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present disclosure and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art known to those skilled in the art. Summary of the Invention

[0006] The present invention provides a high-temperature fast-response temperature protector, which can effectively solve the problems in the background technology.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] A high-temperature fast-response temperature protector comprises: a housing and a bottom plate, a fixing seat and a movable contact piece arranged therein, wherein the bottom plate and the movable contact piece are respectively connected to a first lead and a second lead, and are respectively located on the upper and lower sides of the fixing seat;

[0009] A static contact is provided at one end of the bottom plate away from the first lead, and a moving contact is provided at one end of the moving contact piece away from the second lead, wherein the static contact and the moving contact are arranged opposite to each other;

[0010] A temperature sensing element is provided between the bottom plate and the fixing seat. The temperature sensing element is connected to the movable contact piece via a top column. The top column is provided on the fixing seat and is slidably connected thereto.

[0011] Furthermore, one end of the housing is open, and the other end cooperates with the fixing seat to form an accommodating cavity therein, and the static contact and the moving contact are both arranged in the accommodating cavity;

[0012] One end of the bottom plate extends into the accommodating cavity and protrudes toward the moving contact piece to form a boss, and the static contact is arranged on the boss.

[0013] Furthermore, the movable contact piece is continuously bent in its length direction, including a mounting section, a connecting section and a fixing section arranged in sequence, and the connection between the mounting section and the connecting section abuts against the inner wall of the housing;

[0014] The fixed section is connected to the second lead, the moving contact is located at an end of the installation section away from the connecting section, and a protrusion is provided on the installation section corresponding to the top column.

[0015] Furthermore, the fixing seat is integrally formed of a ceramic material and comprises a front half section and a rear half section respectively arranged close to the accommodating cavity and the opening end of the shell;

[0016] The fixed section is fixed to the rear half section via a clamping plate, a first clamping claw is provided on the clamping plate, and a first clamping groove is provided on the side surface of the rear half section corresponding to the first clamping claw.

[0017] Furthermore, the side of the front half facing the movable contact piece is configured as a concave surface.

[0018] Furthermore, the bottom plate is in contact with the inner wall of the shell, a plurality of second claws are provided on both sides of the bottom plate, and a second clamping groove is provided on the side surface of the fixing seat corresponding to the second claws.

[0019] Furthermore, a mounting groove is provided on a side of the fixing base facing the bottom plate, and the temperature sensing element includes a bimetallic strip arranged in the mounting groove;

[0020] The bimetallic strip includes a deformation section and a limiting section arranged at one end thereof, and a clamping platform is arranged in the installation groove corresponding to the limiting section.

[0021] Furthermore, the deformation section includes a straight portion and a gathered portion, the gathered portion is located at an end of the deformation section away from the limiting section, and its width gradually decreases in a direction away from the straight portion;

[0022] The top column is arranged corresponding to the folding portion, and a through hole is opened on the fixing seat corresponding to the top column, and the through hole is arranged through the upper and lower surfaces of the fixing seat.

[0023] Furthermore, a limiting column is provided on the side of the fixing seat facing the base plate, and two limiting columns are relatively provided at both ends of the length close to the installation slot, and a limiting slot is provided on the base plate corresponding to the limiting column.

[0024] Furthermore, bayonet holes are provided on both sides of the width of the installation groove corresponding to the straight portion, and clamping blocks are provided on both sides of the width of the bottom plate corresponding to the bayonet holes.

[0025] The beneficial effects of the present invention are:

[0026] In the present invention, the bottom plate and the moving contact in the internal components of the shell are respectively located on the upper and lower sides of the fixing base. The top column and the fixing base arranged in the fixing base are both made of insulating materials. The fixing base is made of ceramic material as an integral part, which can effectively improve the heat resistance of the temperature protector. The temperature sensing element is arranged on one side of the fixing base and directly monitors the temperature at the bottom plate, ensuring accurate monitoring and rapid response to the circuit temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the structure of the high-temperature fast-response temperature protector of the present invention;

[0029] Figure 2 Schematic diagram of the structure of the internal components of the temperature protector of the present invention;

[0030] Figure 3 This is a schematic diagram of the explosion structure of the temperature protector in the present invention;

[0031] Figure 4 Schematic diagram of the explosion structure of the internal components of the temperature protector of the present invention;

[0032] Figure 5 Schematic diagram of the explosion of the internal components of the temperature protector of the present invention;

[0033] Figure 6 It is a schematic diagram of the cross-sectional structure of the temperature protector in the present invention.

[0034] Figure numerals: 1. shell; 11. accommodating cavity; 2. bottom plate; 21. static contact; 22. boss; 23. second clamping claw; 24. limiting groove; 25. clamping block; 3. fixing seat; 31. front half; 32. rear half; 33. first clamping groove; 34. concave surface; 35. second clamping groove; 36. mounting groove; 361. boss; 362. bayonet; 37. through hole; 38. limiting column; 4. moving contact piece; 41. moving contact; 42. mounting section; 43. connecting section; 44. fixing section; 45. raised portion; 5. clamping plate; 51. first clamping claw; 6. temperature sensing element; 61. bimetallic strip; 62. deformation section; 621. straight portion; 622. retracted portion; 63. limiting section; 7. top column; 8. first lead; 9. second lead. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0036] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly attached to the other element or there may be an intermediate element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0037] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0038] While conventional temperature protectors offer some protection against temperature fluctuations in electrical circuits, they suffer from inadequate response and heat resistance, making them difficult to meet the demands of electrical circuits for rapid response to high temperatures. By optimizing the structural design of the temperature-sensing element 6 and employing high-temperature-resistant ceramic materials, the present invention aims to improve the temperature protector's response speed, stability, and durability, providing a more reliable safety guarantee for electrical circuits.

[0039] In the present invention, Figures 1 to 6The high-temperature, fast-response temperature protector shown in the figure includes a shell 1 and a base plate 2, a fixed base 3 and a movable contact piece 4 arranged therein. The base plate 2 and the movable contact piece 4 are respectively connected to the first lead 8 and the second lead 9, and are respectively located on the upper and lower sides of the fixed base 3; a static contact 21 is provided at the end of the base plate 2 away from the first lead 8, and a movable contact 41 is provided at the end of the movable contact piece 4 away from the second lead 9, and the static contact 21 and the movable contact 41 are arranged opposite to each other; a temperature sensing element 6 is provided between the base plate 2 and the fixed base 3, and the temperature sensing element 6 is connected to the movable contact piece 4 through a top column 7, and the top column 7 is provided on the fixed base 3 and is slidably connected thereto.

[0040] When the circuit is normally closed, the first lead 8 and the second lead 9 form a circuit path through the movable contact piece 4, the movable contact 41, the static contact 21 and the base plate 2 in sequence. The temperature sensing element 6 senses the change in circuit temperature and bends when the set threshold is reached. The bending deformation of the temperature sensing element 6 is converted into mechanical power to push the top column 7 to move and lift the movable contact piece 4, thereby separating the connection between the movable contact 41 and the static contact 21 on it, thereby disconnecting the circuit.

[0041] The shell 1 serves as the external support structure of the protector to ensure stable installation and effective heat dissipation of the internal components. Among the internal components of the shell 1, the bottom plate 2 and the moving contact 41 are respectively located on the upper and lower sides of the fixing base 3. The top column 7 and the fixing base 3 arranged in the fixing base 3 are both made of insulating material. The temperature sensing element 6 is arranged on one side of the fixing base 3 and directly monitors the temperature at the bottom plate 2 to ensure accurate monitoring and rapid response to the circuit temperature.

[0042] In this embodiment, if Figures 1 to 3 As shown, one end of the shell 1 is open, and the other end cooperates with the fixed base 3 to form an accommodating cavity 11 inside it, and the static contact 21 and the moving contact 41 are both arranged in the accommodating cavity 11; one end of the base plate 2 extends into the accommodating cavity 11 and protrudes toward the moving contact piece 4 to form a boss 22, and the static contact 21 is arranged on the boss 22.

[0043] The internal components of the housing 1 are installed within the housing 1 through its open end. A rubber seal is applied to the open end of the housing 1 to ensure airtightness and dustproofing within the protector during normal use. A receiving cavity 11 formed within the housing 1 at the front end of the mounting base 3 houses the stationary contact 21 and the moving contact 41, providing space for the moving contact 41 to move. The stationary contact 21 is mounted on a boss 22 extending from the base plate 2, accommodating the travel of the moving contact 41. This improves the temperature protector's high-temperature response speed while ensuring reliable circuit closure.

[0044] As a preferred embodiment of the above, Figure 4As shown, the movable contact piece 4 is continuously bent in its length direction, including a mounting section 42, a connecting section 43 and a fixed section 44 arranged in sequence. The connection between the mounting section 42 and the connecting section 43 abuts against the inner wall of the housing 1; the fixed section 44 is connected to the second lead 9, and the movable contact 41 is located at one end of the mounting section 42 away from the connecting section 43. A protrusion 45 is provided on the mounting section 42 corresponding to the top column 7.

[0045] The continuous bending setting of the moving contact piece 4 enables it to be installed inside the shell 1. The moving contact 41 arranged at the front end of the mounting section 42 extends downward into the accommodating cavity 11 and abuts against the static contact 21 due to the abutment between the connection between the mounting section 42 and the connecting section 43 and the inner wall of the shell 1.

[0046] Furthermore, the fixing base 3 is integrally formed of ceramic to enhance the thermal protector's heat resistance. It comprises a front section 31 and a rear section 32, positioned adjacent to the accommodating chamber 11 and the open end of the housing 1, respectively. The fixing section 44 is secured to the rear section 32 via a clamping plate 5, which is provided with a first latch 51. A first latching groove 33 is defined on the side of the rear section 32, corresponding to the first latch 51. The side of the front section 31 facing the movable contact piece 4 is provided with a concave surface 34.

[0047] The moving contact piece 4 is fixed on the upper side of the fixing seat 3 by the clamping plate 5. The upper side of the front half 31 of the fixing seat 3 is concave to form a concave surface 34. Combined with the thickness of the clamping plate 5, it optimizes the overall thickness of the temperature protector while further providing movement space for the installation section 42 on the moving contact piece 4.

[0048] In this embodiment, if Figure 5 and Figure 6 As shown, the base plate 2 abuts the inner wall of the housing 1. A plurality of second claws 23 are provided on both sides of the base plate 2, and second slots 35 are provided on the side of the fixing base 3 corresponding to the second claws 23. The base plate 2 is fixedly connected to the fixing base 3 via the second claws 23 provided thereon. The close fit between the base plate 2 and the inner wall of the housing 1 not only facilitates heat dissipation within the protector, but also facilitates the transmission of external temperature to the temperature sensing element 6, facilitating accurate monitoring of the temperature of the electrical circuit and the ambient temperature of the electrical appliance.

[0049] A mounting slot 36 is defined on the side of the mounting base 3 facing the base plate 2. The temperature sensing element 6 includes a bimetallic strip 61 positioned within the mounting slot 36. The bimetallic strip 61 comprises a deformable section 62 and a retaining section 63 at one end. A retaining plate 361 is positioned within the mounting slot 36, corresponding to the retaining section 63. The bimetallic strip 61 is positioned within the mounting slot 36, with its deformable section 62 in direct contact with the base plate 2 and in contact with it before bending, ensuring accurate circuit temperature monitoring. The retaining plate 361 prevents movement of the bimetallic strip 61 during deformation.

[0050] Furthermore, the deformation section 62 includes a straight portion 621 and a retracted portion 622. The retracted portion 622 is located at one end of the deformation section 62 away from the limiting section 63, and its width gradually decreases in the direction away from the straight portion 621; the top column 7 is arranged corresponding to the retracted portion 622, and a through hole 37 is opened on the fixing seat 3 corresponding to the top column 7, and the through hole 37 is arranged through the upper and lower surfaces of the fixing seat 3.

[0051] The width of the gathered portion 622 of the deformable section 62 gradually decreases as it moves away from the straight portion 621. This allows the gathered portion 622 to bend and deform more quickly when the bimetallic strip 61 is heated, thereby pushing the top post 7 to move. The top post 7 is positioned corresponding to the gathered portion 622. When the bimetallic strip 61 bends due to heat, the gathered portion 622 pushes the top post 7 upward, thereby lifting the mounting section 42 of the movable contact 4, separating the movable contact 41 from the stationary contact 21.

[0052] In this embodiment, if Figure 4 and Figure 5 As shown, considering that the mounting groove 36 cannot limit the bimetallic strip 61, a limiting post 38 is provided on the side of the fixing base 3 facing the base plate 2. Two limiting posts 38 are provided at opposite ends of the length of the mounting groove 36. The base plate 2 has limiting slots 24 corresponding to the limiting posts 38. On both sides of the width of the mounting groove 36, corresponding to the straight portion 621, there are latches 362, and on both sides of the width of the base plate 2, corresponding to the latches 362, there are latch blocks 25.

[0053] The bimetallic strip 61 is limited at both ends of its length by the limiting columns 38 at the front and rear sections of the mounting groove 36. At the same time, the setting of the limiting columns 38 is conducive to the positioning and installation of the fixing seat 3 and the base plate 2. Considering that the fixing seat 3 in the present invention is made of ceramic material and is integrally formed, the straight portions 621 of the bimetallic strip 61 corresponding to the width of the limiting groove 24 are provided as bayonet 362 and cooperate with the block 25 structure on the base plate 2 to realize the limitation of the width of the bimetallic strip 61 on both sides. The setting of the bayonet 362 prevents the ceramic side wall from being too thin and brittle and being damaged during use, thereby ensuring the safety of the temperature protector during long-term operation.

[0054] Those skilled in the art will appreciate that the present invention is not limited to the foregoing embodiments. The foregoing embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and modifications may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and modifications are intended to fall within the scope of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high-temperature fast-response temperature protector, characterized in that: include: A housing (1) and a base plate (2), a fixing seat (3) and a movable contact piece (4) arranged therein, wherein the base plate (2) and the movable contact piece (4) are respectively connected to a first lead (8) and a second lead (9), and are respectively located on the upper and lower sides of the fixing seat (3); A static contact (21) is provided at one end of the base plate (2) away from the first lead (8), and a dynamic contact (41) is provided at one end of the dynamic contact piece (4) away from the second lead (9), wherein the static contact (21) and the dynamic contact (41) are arranged opposite to each other; A temperature sensing element (6) is provided between the bottom plate (2) and the fixing seat (3), and the temperature sensing element (6) is connected to the movable contact piece (4) via a top column (7). The top column (7) is provided on the fixing seat (3) and is slidably connected thereto. The movable contact piece (4) is continuously bent in its length direction and comprises a mounting section (42), a connecting section (43) and a fixing section (44) which are arranged in sequence, and the connection between the mounting section (42) and the connecting section (43) abuts against the inner wall of the housing (1); The fixed section (44) is connected to the second lead (9), the movable contact (41) is located at one end of the mounting section (42) away from the connecting section (43), and a protrusion (45) is provided on the mounting section (42) corresponding to the top column (7); The fixing seat (3) is integrally formed of a ceramic material and comprises a front half section (31) and a rear half section (32) respectively arranged near the accommodating cavity (11) and the opening end of the housing (1); The fixed section (44) is pressed against the rear section (32) via a clamping plate (5); a first clamping claw (51) is provided on the clamping plate (5); and a first clamping groove (33) is provided on the side of the rear section (32) corresponding to the first clamping claw (51).

2. The high-temperature fast-response temperature protector according to claim 1, characterized in that: One end of the housing (1) is open, and the other end cooperates with the fixing seat (3) to form an accommodating cavity (11) therein, and the static contact (21) and the moving contact (41) are both arranged in the accommodating cavity (11); One end of the base plate (2) extends into the accommodating cavity (11) and protrudes toward the movable contact piece (4) to form a boss (22), and the static contact (21) is arranged on the boss (22).

3. The high-temperature fast-response temperature protector according to claim 1, characterized in that: The side of the front half (31) facing the movable contact piece (4) is configured as a concave surface (34).

4. The high-temperature fast-response temperature protector according to claim 1, characterized in that: The bottom plate (2) is in contact with the inner wall of the housing (1), a plurality of second claws (23) are provided on both sides of the bottom plate (2), and a second clamping groove (35) is provided on the side of the fixing seat (3) corresponding to the second claws (23).

5. The high-temperature fast-response temperature protector according to claim 4, characterized in that: A mounting groove (36) is provided on one side of the fixing seat (3) facing the bottom plate (2), and the temperature sensing element (6) includes a bimetallic strip (61) disposed in the mounting groove (36); The bimetallic strip (61) comprises a deformation section (62) and a limiting section (63) arranged at one end thereof, and a clamping platform (361) is arranged in the mounting groove (36) corresponding to the limiting section (63).

6. The high-temperature fast-response temperature protector according to claim 5, characterized in that: The deformation section (62) comprises a straight portion (621) and a gathered portion (622), wherein the gathered portion (622) is located at one end of the deformation section (62) away from the limiting section (63), and its width gradually decreases in a direction away from the straight portion (621); The top column (7) is arranged corresponding to the folding portion (622), and a through hole (37) is opened on the fixing seat (3) corresponding to the top column (7), and the through hole (37) is arranged through the upper and lower surfaces of the fixing seat (3).

7. The high-temperature fast-response temperature protector according to claim 6, characterized in that: A limiting column (38) is provided on one side of the fixing seat (3) facing the base plate (2), and two limiting columns (38) are relatively provided at both ends of the length close to the mounting groove (36), and a limiting groove (24) is provided on the base plate (2) corresponding to the limiting column (38).

8. The high-temperature fast-response temperature protector according to claim 7, characterized in that: A bayonet (362) is provided on both sides of the width of the installation groove (36) corresponding to the straight portion (621), and a clamping block (25) is provided on both sides of the width of the bottom plate (2) corresponding to the bayonet (362).

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