High-temperature quick response temperature protector

Abstract

The invention relates to the technical field of thermal protectors, in particular to a high-temperature quick-response temperature protector, which is characterized in that a first lead and a second lead sequentially pass through a moving contact, a moving contact, a static contact and a bottom plate to form a circuit path, and a temperature sensing element senses the change of circuit temperature and bends when reaching a threshold value; and the bending deformation of the temperature sensing element is converted into mechanical power to push the jacking column to move and jack up the movable contact piece, so that the connection between the movable contact and the static contact on the movable contact piece is separated, and the disconnection of a circuit is realized. The shell serves as an external supporting structure of the protector to ensure stable installation and effective heat dissipation of internal components, a bottom plate and a moving contact in the internal components of the shell are located on the upper side and the lower side of a fixing base respectively, a top column arranged in the fixing base and the fixing base are both made of insulating materials, and the fixing base is made of ceramic materials and integrally formed. And the temperature sensing element is arranged on one side of the fixed seat and monitors the temperature of the bottom plate, so that accurate monitoring and quick response to the temperature of the circuit are ensured.

Description

Technical Field

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

[0002] During the operation of the circuit of electrical equipment, the circuit may overheat due to short circuit, excessive load, etc. If power is not cut off in time, it will not only burn the circuit, but also cause serious consequences such as fire. In order to deal with this problem, an overheat protector is usually connected to the circuit to monitor and control the temperature of the circuit to ensure that the circuit can be disconnected in time when the temperature rises abnormally, thereby protecting the safety of electrical equipment and personnel.

[0003] Traditional temperature protectors can protect the circuit temperature to a certain extent. They disconnect the circuit in the event of overheating through the synergistic effect of the built-in temperature-sensitive deformation piece and the moving contact piece. The temperature-sensitive deformation piece is made of two metal pieces with different thermal expansion coefficients, which are bonded together. The difference in thermal expansion between the two pieces is used to bend the temperature-sensitive deformation piece, which then drives the moving contact piece to move and disconnect the circuit. After the temperature drops, the temperature-sensitive deformation piece returns to its original state, causing the moving contact piece 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 acknowledging or suggesting in any form 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: A high-temperature fast-response temperature protector comprises: a housing and a bottom plate, a fixing seat and a moving contact piece arranged therein, wherein the bottom plate and the moving contact piece are respectively connected to a first lead and a second lead, and are respectively located at the upper and lower sides of the fixing seat; A stationary contact is arranged at one end of the bottom plate away from the first lead, and a moving contact is arranged at one end of the moving contact piece away from the second lead, and the stationary contact is arranged opposite to the moving contact; A temperature sensing element is arranged between the bottom plate and the fixing seat. The temperature sensing element is connected to the moving contact piece through a top column. The top column is arranged on the fixing seat and is slidably connected thereto.

[0008] 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; One end of the bottom plate extends into the accommodating cavity and protrudes toward the moving contact piece to form a boss, and the stationary contact is arranged on the boss.

[0009] Furthermore, the movable contact piece is continuously bent in the length direction thereof, and comprises a mounting section, a connecting section and a fixing section which are arranged in sequence, and the connection between the mounting section and the connecting section abuts against the inner wall of the housing; 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 arranged on the installation section corresponding to the top column.

[0010] 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; The fixed section is pressed and fixed to the rear half section through a clamping plate, a first clamping claw is arranged on the clamping plate, and a first clamping groove is opened on the side surface of the rear half section corresponding to the first clamping claw.

[0011] Furthermore, a side of the front half facing the moving contact piece is configured as a concave surface.

[0012] Furthermore, the bottom plate is in contact with the inner wall of the shell, a plurality of second claws are arranged 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.

[0013] Furthermore, a mounting groove is provided on one side of the fixing seat facing the bottom plate, and the temperature sensing element comprises a bimetallic strip arranged in the mounting groove; The bimetallic strip comprises 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.

[0014] Furthermore, the deformation section includes a straight portion and a gathered portion, the gathered portion is located at one end of the deformation section away from the limiting section, and its width gradually decreases in a direction away from the straight portion; 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.

[0015] Furthermore, a limiting column is arranged on one side of the fixing seat facing the bottom plate, two limiting columns are arranged relatively close to both ends of the length of the installation groove, and limiting grooves are opened on the bottom plate corresponding to the limiting columns.

[0016] Furthermore, snap-in openings 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 snap-in openings.

[0017] The beneficial effects of the present invention are: 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 seat, the top column and the fixing seat arranged in the fixing seat are both made of insulating materials, and the fixing seat is integrally formed of ceramic material, which can effectively improve the heat resistance of the temperature protector. The temperature sensing element is arranged on one side of the fixing seat and directly monitors the temperature at the bottom plate, ensuring accurate monitoring and rapid response to the circuit temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0019] Figure 1 It is a structural schematic diagram of the high temperature fast response temperature protector in the present invention; Figure 2 It is a schematic diagram of the structure of the internal components of the temperature protector in the present invention; Figure 3 This is a schematic diagram of the explosion structure of the temperature protector in the present invention; Figure 4 It is a schematic diagram of the explosion structure of the internal components of the temperature protector in the present invention; Figure 5 It is a schematic diagram of the explosion of the internal components of the temperature protector in the present invention; Figure 6 It is a schematic diagram of the cross-sectional structure of the temperature protector in the present invention.

[0020] 1. Shell; 2. Accommodating cavity; 3. Bottom plate; 4. Stationary contact; 5. Boss; 6. Second clamping claw; 7. Limiting groove; 8. Block; 9. Fixing seat; 10. Front half section; 11. Rear half section; 12. First clamping groove; 13. Concave surface; 14. Second clamping groove; 15. Mounting groove; 16. Boss; 17. Through hole; 18. Limiting column; 19. Moving contact piece; 20. Moving contact; 21. Mounting section; 22. Connecting section; 23. Fixing section; 24. Protruding portion; 25. Block; 3. Fixing seat; 31. Front half section; 32. Rear half section; 33. First clamping groove; 34. Concave surface; 35. Second clamping groove; 36. Mounting groove; 361. Boss; 362. Clamping portion; 37. Through hole; 38. Limiting column; 4. Moving contact piece; 41. Moving contact piece; 42. Mounting section; 43. Connecting section; 44. Fixed section; 45. Protruding 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 wire; 9. Second lead wire. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely 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.

[0022] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0024] Although the traditional temperature protector can protect the temperature of the circuit of the electrical equipment to a certain extent, it has the defects of insufficient sensitivity and insufficient temperature resistance, and it is difficult to meet the demand of the electrical circuit for rapid response to high temperature. The present invention optimizes the structural design of the temperature sensing element 6 and adopts high temperature resistant ceramic material to improve the response speed, stability and durability of the temperature protector, and provide more reliable safety protection for the electrical circuit.

[0025] In the present invention, Figures 1 to 6A high-temperature fast-response temperature protector shown in the figure comprises a shell 1 and a base plate 2, a fixing seat 3 and a moving contact piece 4 arranged therein, the base plate 2 and the moving 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 stationary contact 21 is arranged at one end of the base plate 2 away from the first lead 8, and a moving contact 41 is arranged at one end of the moving contact piece 4 away from the second lead 9, and the stationary contact 21 and the moving contact 41 are arranged opposite to each other; a temperature sensing element 6 is arranged between the base plate 2 and the fixing seat 3, and the temperature sensing element 6 is connected to the moving contact piece 4 through a top column 7, and the top column 7 is arranged on the fixing seat 3 and is slidably connected thereto.

[0026] When the circuit is normally closed, the first lead 8 and the second lead 9 form a circuit path through the moving contact piece 4, the moving contact 41, the static contact 21 and the bottom plate 2 in sequence, and sense the change of the circuit temperature through the temperature sensing element 6 and bend 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 moving contact piece 4, so that the connection between the moving contact 41 and the static contact 21 is separated, thereby disconnecting the circuit.

[0027] The shell 1 serves as the external supporting 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 materials. 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.

[0028] In this embodiment, if Figures 1 to 3 As shown, one end of the shell 1 is opened, and the other end cooperates with the fixed seat 3 to form an accommodating cavity 11 inside, 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.

[0029] The internal components of the housing 1 are installed into the housing 1 through the open end of the housing 1, and a glue seal is provided at the open end of the housing 1 to ensure the sealing and dustproof performance of the protector during normal use. The accommodating cavity 11 formed at the front end of the fixing seat 3 inside the housing 1 is used to accommodate the static contact 21 and the moving contact 41, and provides an operating space for the displacement of the moving contact 41; the static contact 21 is arranged on the boss 22 extending from the bottom plate 2, so that it can adapt to the movement stroke of the moving contact 41, and improve the high temperature response speed of the temperature protector while ensuring the reliability of the circuit closed state.

[0030] As a preferred embodiment of the above, Figure 4As shown, the moving contact piece 4 is continuously bent in the length direction thereof, and includes a mounting section 42, a connecting section 43 and a fixing section 44 which are 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 fixing section 44 is connected to the second lead 9, and the moving 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.

[0031] 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 installation 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 installation section 42 and the connecting section 43 and the inner wall of the shell 1.

[0032] Furthermore, the fixing seat 3 is integrally formed of ceramic material to improve the heat resistance of the temperature protector, and includes 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 fixing section 44 is pressed and fixed to the rear half section 32 by a clamping plate 5, a first clamping claw 51 is arranged on the clamping plate 5, and a first clamping groove 33 is opened on the side of the rear half section 32 corresponding to the first clamping claw 51. The side of the front half section 31 facing the movable contact piece 4 is arranged as a concave surface 34.

[0033] 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.

[0034] In this embodiment, if Figure 5 and Figure 6 As shown, the bottom plate 2 is in contact with the inner wall of the housing 1, and 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. The bottom plate 2 is fixedly connected with the fixing seat 3 by the second claws 23 provided thereon, and the bottom plate 2 is fitted with the inner wall of the housing 1, which is not only conducive to the heat dissipation inside the protector, but also conducive to the conduction of the external temperature to the temperature sensing element 6, so as to facilitate the accurate monitoring of the circuit temperature of the electrical appliance and the ambient temperature of the electrical appliance.

[0035] A mounting groove 36 is provided on the side of the fixing seat 3 facing the bottom plate 2. The temperature sensing element 6 includes a bimetallic strip 61 disposed in the mounting groove 36. The bimetallic strip 61 includes a deformation section 62 and a limit section 63 disposed at one end thereof. A clamping platform 361 is disposed in the mounting groove 36 corresponding to the limit section 63. The bimetallic strip 61 is disposed in the mounting groove 36, and its deformation section 62 is in direct contact with the bottom plate 2, and fits with the bottom plate 2 before bending and deformation, so as to ensure accurate circuit temperature monitoring. The setting of the clamping platform 361 prevents displacement and movement of the bimetallic strip 61 during deformation.

[0036] 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 fixed seat 3 corresponding to the top column 7, and the through hole 37 is arranged through the upper and lower surfaces of the fixed seat 3.

[0037] The width of the gathered portion 622 of the deformation section 62 gradually decreases in the direction away from the straight portion 621, so that when the bimetallic strip 61 is heated, the gathered portion 622 can bend and deform faster, thereby pushing the top column 7 to move. The top column 7 is arranged corresponding to the gathered portion 622. When the bimetallic strip 61 is bent by heat, the gathered portion 622 will push the top column 7 to move upward, thereby pushing up the mounting section 42 of the moving contact piece 4 to separate the moving contact 41 from the static contact 21.

[0038] In this embodiment, if Figure 4 and Figure 5 As shown, considering that the installation groove 36 cannot limit the bimetallic strip 61, a limiting column 38 is provided on the side of the fixing seat 3 facing the bottom plate 2, and two limiting columns 38 are relatively provided at both ends of the length close to the installation groove 36, and a limiting groove 24 is provided on the bottom plate 2 corresponding to the limiting columns 38. 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.

[0039] 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, and 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 integrally formed of a ceramic material, the straight portions 621 of the bimetallic strip 61 corresponding to the width of the limiting groove 24 are provided with bayonet 362 and cooperate with the block 25 structure on the base plate 2 to achieve 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.

[0040] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A high temperature fast response temperature protector, characterized in that: include: A housing (1) and a bottom plate (2), a fixing seat (3) and a moving contact piece (4) arranged therein, wherein the bottom plate (2) and the moving 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 stationary contact (21) is provided at one end of the base plate (2) away from the first lead (8), and a moving contact (41) is provided at one end of the moving contact piece (4) away from the second lead (9), wherein the stationary contact (21) and the moving contact (41) are arranged opposite to each other; A temperature sensing element (6) is arranged between the bottom plate (2) and the fixing seat (3); the temperature sensing element (6) is connected to the moving contact piece (4) via a top column (7); and the top column (7) is arranged on the fixing seat (3) and is slidably connected thereto.

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

3. The high temperature fast response temperature protector according to claim 2, characterized in that: The movable contact piece (4) is continuously bent in the length direction thereof, and comprises a mounting section (42), a connecting section (43) and a fixing section (44) which are arranged in sequence, and the connection point 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 moving 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).

4. The high temperature fast response temperature protector according to claim 3, characterized in that: 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 close to the accommodating cavity (11) and the opening end of the shell (1); The fixing section (44) is pressed onto 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).

5. The high temperature fast response temperature protector according to claim 4, characterized in that: A side of the front half section (31) facing the moving contact piece (4) is arranged as a concave surface (34).

6. The high temperature fast response temperature protector according to claim 4, characterized in that: The bottom plate (2) is in contact with the inner wall of the shell (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 surface of the fixing seat (3) corresponding to the second claws (23).

7. The high temperature fast response temperature protector according to claim 6, 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) comprises a bimetallic strip (61) arranged 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 installation groove (36) corresponding to the limiting section (63).

8. The high temperature fast response temperature protector according to claim 7, characterized in that: The deformation section (62) comprises a straight portion (621) and a gathered portion (622); the gathered portion (622) is located at an 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).

9. The high temperature fast response temperature protector according to claim 8, characterized in that: A limiting column (38) is arranged on one side of the fixing seat (3) facing the base plate (2), and two limiting columns (38) are arranged opposite to each other 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).

10. The high temperature fast response temperature protector according to claim 9, 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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