Novel NTC (Negative Temperature Coefficient) thermosensitive resistor
By installing metal layers and metal strips made of the same material on both sides of the NTC thermistor, and fixing them with snaps and bayonets at limits, the problems of the leads and metal coating disengagement and the compression sheet breakage are solved, and the stability and service life of the sensor are improved.
Patent Information
- Application Number
- CN202420934696.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-03-18
- Estimated Expiration
- 2034-04-30
AI Technical Summary
During the long-term use of existing NTC thermistors, due to the differences in mechanical stress and thermal expansion between the leads and the metal coating, the metal coating is easily disengaged from the leads, and the pressure plate is extruded and broken, reducing the reliability of the sensor.
A new NTC thermistor was designed. By installing metal layers as electrodes on both sides of the pressing plate, and opening rectangular grooves and arc grooves on the metal layer. After the metal strips are inserted, there is an expansion space. The metal layer and the metal strip are made of the same material, and are fixed with the bayonet limit through snaps and bayonet limits to absorb and disperse mechanical stress.
It effectively avoids the problem of metal strips and metal layers being separated during long-term use, improves the stability and service life of NTC thermistors, and prevents damage to the tablet.
Smart Images
Figure CN222636959U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of thermistors, and in particular relates to a novel NTC thermistor. Background Art
[0002] A thermistor chip is a sensor that converts temperature changes into resistance changes. It uses the thermal effect to generate voltage or circuit changes when a temperature difference is formed at both ends of the material, thereby reflecting the temperature change. Thermistor chips are usually composed of a pressing sheet, a metal coating and leads. When the thermistor chip is heated and used, mechanical stress will be generated between the leads and the pressing sheet. The leads and the metal coating are prone to detachment from each other, and the pressing sheet may even be squeezed and broken, resulting in reduced sensor reliability. Utility Model Content
[0003] Purpose of the utility model: to provide a new type of NTC thermistor to solve the above problems existing in the prior art.
[0004] Technical solution: A new type of NTC thermistor, including a pressing sheet, which is cylindrical, and metal layers are installed on opposite sides of the pressing sheet respectively. The metal layers serve as electrodes of the thermistor. A clamping portion is provided on the surface of the metal layer toward the pressing sheet, and two groups of mounting holes are provided on the metal layer. The mounting holes are located on both sides of the clamping portion, and the mounting holes penetrate the pressing sheet. Bolts are installed in the mounting holes, and the metal layers are limited on both sides of the pressing sheet by the bolts. A clamping port is provided on the clamping portion relative to the inner wall, and a metal strip is inserted in the clamping portion. Two groups of buckles are installed on the metal strip, and the buckles and the clamping port are abutted against each other for limiting position.
[0005] Preferably, the clamping portion includes a rectangular groove, which extends along the surface of the metal layer toward the pressing direction, and arc grooves are provided on two opposite side walls of the rectangular groove, and the arc grooves extend along the side walls of the rectangular groove toward the inside of the metal layer. The accommodating cavity formed by the arc groove and the rectangular groove is used to place the metal strip, and the clamping port is located on the inner wall of the arc groove and extends along the inner wall of the arc groove toward the inside of the metal layer.
[0006] Preferably, the metal strip comprises a rectangular rod, and the mutually opposing side walls of the rectangular rod are respectively provided with arc-shaped protrusions, the arc-shaped protrusions are integrally formed with the rectangular rod, and the shape of the longitudinal cross-section of the metal strip formed by the rectangular rod and the arc-shaped protrusions is the same as the shape of the longitudinal cross-section of the clamping portion.
[0007] Preferably, a rectangular hole is opened in the metal strip, and the rectangular hole is located in the middle of the metal strip. The opposite inner walls of the rectangular hole are respectively opened with through holes, and the through holes penetrate the metal strip. The length of the through holes is smaller than the length of the rectangular hole. With the cooperation of the rectangular hole and the through hole, the buckle is limited in the cavity formed by the through hole and the rectangular hole.
[0008] Preferably, the buckle includes two groups of movable plates placed in the rectangular hole, and springs are arranged between the movable plates. The two groups of movable plates are abutted at the connection between the rectangular hole and the through hole by the springs. A card block is installed on the movable plate, and the card block passes through the through hole and abuts in the bayonet.
[0009] Preferably, the horizontal cross-section of the bayonet is in the same shape as the horizontal cross-section of the clamping block.
[0010] Preferably, the metal layer, the metal strip and the buckle are made of the same metal.
[0011] Beneficial effects: The utility model relates to a novel NTC thermistor, which is provided with metal layers as electrodes on both sides of a pressing sheet, and rectangular grooves and arc grooves are provided on the metal layers. After a metal strip is inserted into the rectangular grooves and the arc grooves, both the upper and lower ends of the metal strip have expansion space, and the metal strip and the metal layer are made of the same material, wherein the metal strip is a lead connected to the outside, that is, during long-term use, since the metal layer and the metal strip are made of the same material, their mechanical properties and thermal expansion coefficients are the same, that is, during long-term use, since there is a gap between the upper and lower ends of the metal strip, the metal layer and the gap cooperate with each other to absorb and disperse the mechanical stress of the metal strip, thereby avoiding excessive pressure on the pressing sheet or excessive concentration of stress, which may cause damage to the pressing sheet;
[0012] Secondly, the metal strip and the metal layer are fixed by the buckle and the bayonet, which can effectively avoid the problem of the metal strip and the metal layer being separated during long-term use. It not only ensures the stability of NTC thermistor detection, but also extends the service life of the NTC thermistor. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0014] Figure 2 It is an overall exploded view of the utility model;
[0015] Figure 3 This is an exploded view of the buckle of the utility model;
[0016] Figure 4 It is a cross-sectional view of the metal strip of the utility model;
[0017] Figure 5 for Figure 4 A magnified image of point A;
[0018] Figure 6 It is a cross-sectional view of the metal layer of the utility model;
[0019] Figure 7for Figure 6 Enlarged view of point B.
[0020] Figures 1 to 7 The reference numerals in the accompanying drawings are: 1. pressing sheet; 2. metal layer; 3. clamping part; 4. bayonet; 5. metal strip; 6. buckle; 7. rectangular hole; 8. through hole; 9. mounting hole; 10. bolt; 31. rectangular groove; 32. arc groove; 51. rectangular rod; 52. arc protrusion; 61. movable plate; 62. spring; 63. block. DETAILED DESCRIPTION
[0021] like Figures 1 to 7 As shown, the utility model provides a technical solution: a new NTC thermistor, including a pressing sheet 1, two groups of metal layers 2, two groups of mounting holes 9 and two groups of metal strips 5, the mounting holes 9 penetrate the telescopic metal layer 2 and the pressing sheet 1, in this embodiment, the pressing sheet 1 is cylindrical, the metal layer 2 is installed at the upper and lower ends of the pressing sheet 1, and the metal layer 2 is limited on both sides of the pressing sheet 1 by inserting the bolts 10 into the mounting holes 9. The metal layers 2 located on both sides of the pressing sheet 1 serve as electrodes of the thermistor. In this embodiment, the bolts 10 are made of insulating high-temperature resistant materials, such as Figure 1 As shown, the surface of the metal layer 2 is provided with a clamping portion 3 toward the pressing sheet 1, and the clamping portion 3 includes a rectangular groove 31, which is opened on the outer wall of the metal layer 2, and the rectangular groove 31 extends along the surface of the metal layer 2 toward the pressing sheet 1. The two opposite side walls of the rectangular groove 31 are provided with arc grooves 32, and the arc grooves 32 extend toward the inside of the metal layer 2 along the side walls of the rectangular groove 31. Each group of the arc grooves 32 is provided with a buckle 6 on the inner wall, and the accommodating cavity formed by the arc groove 32 and the rectangular groove 31 is used to place the metal strip 5, as shown in FIG. Figure 3 As shown, the metal strip 5 includes a rectangular rod 51, the rectangular rod 51 is inserted into the rectangular groove 31, and the mutually opposing side walls of the rectangular rod 51 are respectively installed with arc-shaped protrusions 52, the arc-shaped protrusions 52 are inserted into the arc-shaped groove 32, the arc-shaped protrusions 52 and the rectangular rod 51 are integrally formed, and the shape of the longitudinal cross-section of the metal strip 5 formed by the rectangular rod 51 and the arc-shaped protrusions 52 is the same as the longitudinal cross-section of the clamping portion 3, that is, after the metal strip 5 is inserted into the clamping portion 3, as shown Figure 1As shown, there is a gap between the rectangular rod 51 and the two end surfaces of the metal layer 2, a rectangular hole 7 is opened in the middle of the rectangular rod 51, and the inner walls opposite to the rectangular hole 7 are respectively opened with through holes 8, and the through holes 8 penetrate the arc-shaped protrusion 52, and the length of the through hole 8 is less than the length of the rectangular hole 7. Under the cooperation of the rectangular hole 7 and the through hole 8, the buckle 6 is limited in the cavity formed by the through hole 8 and the rectangular hole 7, and the bayonet 4 is located on the inner wall of the arc groove 32 and extends toward the inside of the metal layer 2 along the inner wall of the arc groove 32. After the metal strip 5 is inserted into the rectangular groove 31, the buckle 6 located in the rectangular hole 7 shrinks into the rectangular hole 7 or the through hole 8 under the action of the inner wall of the rectangular groove 31. After the buckle 6 moves to the vicinity of the buckle 4, the buckle 6 abuts against the buckle 4, so that the metal strip 5 is limited in the metal layer 2. The metal layer 2, the metal strip 5 and the buckle 6 are made of metal of the same material. By installing the metal layer 2 on both sides of the pressing sheet 1 as an electrode, a rectangular groove 3 is opened on the metal layer 2 1 and arc groove 32, after the metal strip 5 is inserted into the rectangular groove 31 and the arc groove 32, the upper and lower ends of the metal strip 5 both have expansion space, the metal strip 5 and the metal layer 2 are made of the same material, wherein the metal strip 5 is a lead connected to the outside, that is, during long-term use, since the metal layer 2 and the metal strip 5 are made of the same material, their mechanical properties and thermal expansion coefficients are the same, that is, during long-term use, since there is a gap between the upper and lower ends of the metal strip 5, the mutual cooperation of the metal layer 2 and the gap can absorb and disperse the mechanical stress of the metal strip 5, avoid excessive pressure on the pressing sheet 1 or excessive concentration of stress, and cause damage to the pressing sheet 1; secondly, the metal strip 5 and the metal layer 2 are fixed by the buckle 6 and the bayonet 4, which can effectively avoid the problem of the metal strip 5 being separated from the metal layer 2 during long-term use, which can not only ensure the stability of the NTC thermistor detection, but also extend the service life of the NTC thermistor.
[0022] In a further embodiment, Figure 3As shown, the buckle 6 includes two groups of moving plates 61, the moving plates 61 are placed in the rectangular hole 7, and springs 62 are arranged between the moving plates 61. The two groups of moving plates 61 are abutted at the connection between the rectangular hole 7 and the through hole 8 by the springs 62. A card block 63 is installed on the moving plate 61, and the card block 63 passes through the through hole 8 and abuts against the bayonet 4. After the rectangular rod 51 is inserted into the rectangular hole 7, the card block 63 is squeezed under the action of the arc groove 32, and the spring 62 contracts. Move the block 63 into the through hole 8. After the block 63 moves to the vicinity of the bayonet 4, the block 63 and the movable plate 61 move out under the action of the spring 62. At this time, the block 63 moves out of the through hole 8, and the movable plate 61 moves to the connection between the rectangular hole 7 and the through hole 8. The horizontal cross-section of the bayonet 4 is the same as the horizontal cross-section of the block 63. At this time, the block 63 abuts against the bayonet 4, and the rectangular rod 51 is limited and fixed in the rectangular groove 31. At this time, the rectangular rod 51 is connected to the external device as a lead.
[0023] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.
Claims
1. A new type of NTC thermistor, characterized in that: The invention comprises a pressing sheet (1), wherein the pressing sheet (1) is cylindrical, and metal layers (2) are respectively installed on opposite sides of the pressing sheet (1), and the metal layers (2) serve as electrodes of the thermistor. A clamping portion (3) is provided on the surface of the metal layer (2) facing the pressing sheet (1), and the metal layer (2) is provided with two groups of mounting holes (9), and the mounting holes (9) are located on both sides of the clamping portion (3). The mounting holes (9) penetrate the pressing sheet (1), and bolts (10) are installed in the mounting holes (9). The metal layer (2) is limited on both sides of the pressing sheet (1) by the bolts (10). The clamping portion (3) is provided with a clamping opening (4) relative to the inner wall, and a metal strip (5) is inserted in the clamping portion (3). Two groups of buckles (6) are installed on the metal strip (5), and the buckles (6) and the clamping opening (4) are mutually abutted for limiting.
2. A novel NTC thermistor according to claim 1, characterized in that: The clamping portion (3) comprises a rectangular groove (31), the rectangular groove (31) extending along the surface of the metal layer (2) towards the pressing sheet (1), arc grooves (32) are provided on two opposite side walls of the rectangular groove (31), the arc groove (32) extends along the side wall of the rectangular groove (31) towards the inside of the metal layer (2), the accommodating cavity formed by the arc groove (32) and the rectangular groove (31) is used to place the metal strip (5), and the clamping opening (4) is located on the inner wall of the arc groove (32) and extends along the inner wall of the arc groove (32) towards the inside of the metal layer (2).
3. A novel NTC thermistor according to claim 1, characterized in that: The metal strip (5) comprises a rectangular rod (51), and mutually opposing side walls of the rectangular rod (51) are respectively provided with arc-shaped protrusions (52), the arc-shaped protrusions (52) and the rectangular rod (51) being integrally formed, and the shape of the longitudinal cross-section of the metal strip (5) formed by the rectangular rod (51) and the arc-shaped protrusions (52) is the same as the shape of the longitudinal cross-section of the clamping portion (3).
4. A novel NTC thermistor according to claim 1, characterized in that: A rectangular hole (7) is provided in the metal strip (5), the rectangular hole (7) being located in the middle of the metal strip (5), through holes (8) are provided on opposite inner walls of the rectangular hole (7), the through holes (8) penetrate the metal strip (5), the length of the through holes (8) is less than the length of the rectangular hole (7), and the buckle (6) is limited in a cavity formed by the through holes (8) and the rectangular hole (7) under the cooperation of the rectangular hole (7) and the through holes (8).
5. A novel NTC thermistor according to claim 4, characterized in that: The buckle (6) comprises two groups of movable plates (61) which are placed in the rectangular hole (7). A spring (62) is arranged between the movable plates (61). The two groups of movable plates (61) are abutted against the connection between the rectangular hole (7) and the through hole (8) by the spring (62). A clamping block (63) is installed on the movable plate (61). The clamping block (63) passes through the through hole (8) and abuts against the inside of the clamping port (4).
6. A novel NTC thermistor according to claim 5, characterized in that: The horizontal cross-section of the bayonet (4) has the same shape as the horizontal cross-section of the clamping block (63).
7. A novel NTC thermistor according to claim 1, characterized in that: The metal layer (2), the metal strip (5) and the buckle (6) are made of the same metal.