NTC (Negative Temperature Coefficient) temperature sensor with protective sleeve

Abstract

The utility model relates to the technical field of NTC temperature sensors, in particular to an NTC temperature sensor provided with a protective sleeve, which comprises a lead, a lead and an NTC thermal sensitive ceramic chip, the outer side of the lead is attached to the inner side of a sealing and fixing assembly, the outer side of the sealing and fixing assembly is attached to the inner side of a protective sleeve assembly, and the inner side of the protective sleeve assembly is filled with a heat-conducting buffer silica gel ball. The sealing fixing assembly comprises a sealing silica gel sleeve, a rebound cavity and a sealing hole are formed in the inner side of the sealing silica gel sleeve, the rear end of the sealing silica gel sleeve is attached to the front end of a gasket, the rear end of the gasket is attached to the front end of a steel ball, the steel ball is embedded into the front end of a stud, the rear end of the stud is fixedly connected with an operation handle, and a first inserting hole is formed in the inner side of the stud. According to the utility model, the assembly of the device is simplified, the device is convenient to maintain and replace, the heat conduction performance is improved, the response is accelerated, and the temperature measurement precision and reliability are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to NTC temperature sensor technical field, concretely is a kind of NTC temperature sensor with protective sleeve. BACKGROUND

[0002] NTC temperature sensor is a kind of temperature detection device made by using negative temperature coefficient thermistor principle, its resistance value will decrease with the temperature rise, and this sensor is widely used in various temperature measurement and control occasions, such as household appliances, automobile, medical equipment and industrial control system, due to its high sensitivity, fast response, small size, lower cost and other advantages;

[0003] The main reason for NTC temperature sensor to be provided with protective sleeve is to improve insulation stability, protect the sensor from moisture and dust in the external environment, and avoid the reduction of insulation performance.

[0004] After the prior art sets protective sleeve on the outside of NTC temperature sensor, fills and seals filling layer, such as epoxy resin glue curing layer, between protective sleeve and sensor, although the impurity resistance of sensor can be improved, but after protective sleeve and sealing filling layer solidify, the maintenance and replacement of sensor become complex, therefore, a kind of NTC temperature sensor with protective sleeve is provided for the above problems. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a kind of NTC temperature sensor with protective sleeve, to solve the problem that the prior art sets protective sleeve on the outside of NTC temperature sensor, fills and seals filling layer, such as epoxy resin glue curing layer, between protective sleeve and sensor, although the impurity resistance of sensor can be improved, but after protective sleeve and sealing filling layer solidify, the maintenance and replacement of sensor become complex.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of NTC temperature sensor with protective sleeve, including wire, lead and NTC thermosensitive ceramic chip, the wire outside is attached with the inside of sealing fixed component, the sealing fixed component outside is attached with the inside of protective sleeve component, the inside of protective sleeve component is filled with heat-conducting buffer silica gel ball, the sealing fixed component includes sealing silica gel sleeve, the inside of sealing silica gel sleeve is equipped with rebound cavity and sealing hole, the rear end of sealing silica gel sleeve is attached with the front end of gasket, the rear end of gasket is attached with the front end of steel ball, the steel ball is embedded in the front end of stud, the rear end of stud is fixedly connected with operating handle, the first plug-in hole is opened in the inside of stud, the second plug-in hole is opened in the inside of gasket, the outside of sealing silica gel sleeve is attached with the inside of protective sleeve component.

[0008] As the further optimization of the utility model, wherein: the protective sleeve assembly includes a stainless steel protective shell, the front half of the stainless steel protective shell is provided with a filling groove, the rear half of the stainless steel protective shell is provided with a sealing groove and a threaded hole, the front end of the stainless steel protective shell is a plugging structure, the rear end of the stainless steel protective shell is a through structure, and the filling groove, the sealing groove and the threaded hole are communicated.

[0009] As the further optimization of the utility model, wherein: the protective sleeve assembly includes a stainless steel protective shell, the front half of the stainless steel protective shell is provided with a filling groove, the rear half of the stainless steel protective shell is provided with a sealing groove and a threaded hole, the front end of the stainless steel protective shell is a plugging structure, the rear end of the stainless steel protective shell is a through structure, and the filling groove, the sealing groove and the threaded hole are communicated.

[0010] As the further optimization of the utility model, wherein: the protective sleeve assembly includes a stainless steel protective shell, the front half of the stainless steel protective shell is provided with a filling groove, the rear half of the stainless steel protective shell is provided with a sealing groove and a threaded hole, the front end of the stainless steel protective shell is a plugging structure, the rear end of the stainless steel protective shell is a through structure, and the filling groove, the sealing groove and the threaded hole are communicated.

[0011] As the further optimization of the utility model, wherein: the protective sleeve assembly includes a stainless steel protective shell, the front half of the stainless steel protective shell is provided with a filling groove, the rear half of the stainless steel protective shell is provided with a sealing groove and a threaded hole, the front end of the stainless steel protective shell is a plugging structure, the rear end of the stainless steel protective shell is a through structure, and the filling groove, the sealing groove and the threaded hole are communicated.

[0012] As the further optimization of the utility model, wherein: the protective sleeve assembly includes a stainless steel protective shell, the front half of the stainless steel protective shell is provided with a filling groove, the rear half of the stainless steel protective shell is provided with a sealing groove and a threaded hole, the front end of the stainless steel protective shell is a plugging structure, the rear end of the stainless steel protective shell is a through structure, and the filling groove, the sealing groove and the threaded hole are communicated.

[0013] As the further optimization of the utility model, wherein: the protective sleeve assembly includes a stainless steel protective shell, the front half of the stainless steel protective shell is provided with a filling groove, the rear half of the stainless steel protective shell is provided with a sealing groove and a threaded hole, the front end of the stainless steel protective shell is a plugging structure, the rear end of the stainless steel protective shell is a through structure, and the filling groove, the sealing groove and the threaded hole are communicated.

[0014] Compared with the prior art, the utility model has the advantages of:

[0015] In the utility model, the protective sleeve assembly and the heat-conducting buffer silica gel ball are arranged, so that the production and assembly process is simplified, complex procedures are not needed, and the device is convenient to maintain and replace in the later period; under the premise of buffer protection, the heat-conducting performance of the sensor can be improved, heat can be quickly transferred from the measured object to the NTC thermosensitive ceramic chip, the response speed and the measurement accuracy of the sensor are improved, and the temperature measurement reliability is enhanced. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a cross-sectional structural diagram of the protective sleeve assembly of this utility model;

[0018] Figure 3 This is a schematic diagram of the stainless steel protective shell structure of this utility model;

[0019] Figure 4 This is a cross-sectional structural diagram of the sealing and fixing component of this utility model;

[0020] Figure 5 This is an exploded structural diagram of the sealing and fixing assembly of this utility model;

[0021] Figure 6 This is a schematic diagram of the thermally conductive buffer silicone ball structure of this utility model.

[0022] In the diagram: 1. Wire; 2. Lead wire; 3. NTC thermistor ceramic chip;

[0023] 4. Protective sleeve assembly; 41. Stainless steel protective shell; 42. Filler groove; 43. Sealing groove; 44. Threaded hole;

[0024] 5. Sealing and fixing assembly; 51. Sealing silicone sleeve; 52. Rebound cavity; 53. Sealing hole; 54. Gasket; 55. Stud; 56. Operating handle; 57. Steel ball; 58. First insertion hole; 59. Second insertion hole;

[0025] 6. Thermally conductive buffer silicone balls. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0028] Please see Figures 1-6 This utility model provides a technical solution:

[0029] An NTC temperature sensor with a protective sleeve includes a wire 1, a lead wire 2, and an NTC thermistor ceramic chip 3. The outer side of the wire 1 is attached to the inner side of a sealing and fixing component 5, and the outer side of the sealing and fixing component 5 is attached to the inner side of a protective sleeve component 4. The inner side of the protective sleeve component 4 is filled with a thermally conductive buffer silicone ball 6. The sealing and fixing component 5 includes a sealing silicone sleeve 51. The inner side of the sealing silicone sleeve 51 has a rebound cavity 52 and a sealing hole 53. The rear end of the sealing silicone sleeve 51 is attached to the front end of a gasket 54, and the rear end of the gasket 54 is attached to the front end of a steel ball 57. The steel ball 57 is embedded in the front end of a stud 55. An operating handle 56 is fixedly connected to the rear end of the stud 55. The inner side of the stud 55 has a first insertion hole 58, and the inner side of the gasket 54 has a second insertion hole 59. The outer side of the sealing silicone sleeve 51 is attached to the inner side of the protective sleeve component 4.

[0030] The thermally conductive buffer silicone ball 6 and the sealing silicone sleeve 51 are both made of highly conductive and elastic silicone material, which can ensure high thermal conductivity and improve the accuracy of the NTC temperature sensor with protective sleeve in use.

[0031] As a further implementation of this solution, the protective sleeve assembly 4 includes a stainless steel protective shell 41. The front half of the stainless steel protective shell 41 has a filling groove 42, and the rear half of the stainless steel protective shell 41 has a sealing groove 43 and a threaded hole 44. The front end of the stainless steel protective shell 41 is a sealing structure, and the rear end of the stainless steel protective shell 41 is a through structure. The filling groove 42, the sealing groove 43 and the threaded hole 44 are connected. The lead wire 2 and the NTC thermistor ceramic chip 3 are embedded in the filling groove 42. The wire 1 is embedded in the sealing groove 43 and the threaded hole 44. The wire 1 extends out of the outer side of the protective sleeve assembly 4. The wire 1, the lead wire 2 and the NTC thermistor ceramic chip 3 are electrically connected. Through the above settings, this design allows the sensor assembly to be easily embedded and installed, while ensuring the sealing between the sensor assembly and the protective shell, thus improving the protection performance and reliability of the sensor.

[0032] As a further implementation of this solution, thermally conductive buffer silicone balls 6 are filled inside the filling groove 42. There are multiple thermally conductive buffer silicone balls 6, which are bonded to the NTC thermistor ceramic chip 3. The outer side of the thermally conductive buffer silicone balls 6 is bonded to the inner side of the stainless steel protective shell 41. The thermally conductive buffer silicone balls 6 are hollow spheres, and several arc-shaped grooves are opened through the inner side of the thermally conductive buffer silicone balls 6. Through the above settings, this filling method not only improves the thermal conductivity of the sensor, but also increases the buffer protection capability of the sensor through the design of hollow spheres and arc-shaped grooves, thereby improving the safety of the sensor in use.

[0033] As a further implementation of this solution, the sealing silicone sleeve 51 is fitted onto the outside of the wire 1 through the sealing hole 53, the gasket 54 is fitted onto the outside of the wire 1 through the second insertion hole 59, and the stud 55 is fitted onto the outside of the wire 1 through the first insertion hole 58. The front end of the sealing silicone sleeve 51 is in contact with the outside of the rear heat-conducting buffer silicone ball 6. The positions of the sealing silicone sleeve 51, gasket 54, and stud 55 are arranged sequentially from front to back. The outside of the sealing silicone sleeve 51 is in close contact with the inside of the sealing groove 43, and the inside of the sealing silicone sleeve 51 is in close contact with the outside of the wire 1. The outside of the stud 55 is provided with threads, and the outside of the stud 55 is spirally fitted with the inside of the threaded hole 44. The front end of the stud 55 has a ball groove, and the steel ball 57 extends out of the front end of the stud 55. Through the above settings, the assembly efficiency of the sensor is improved. At the same time, the ball groove design increases the buffer protection capability of the sensor, improves the safety of the sensor, and facilitates later maintenance and replacement. The thread design enhances the fixing stability of the sensor and improves the structural reliability of the sensor.

[0034] Workflow: During device production and assembly, firstly, the NTC thermistor ceramic chip 3 and lead wire 2 are inserted into the filling groove 42 through the threaded hole 44 in the stainless steel protective shell 41. Then, the thermally conductive buffer silicone ball 6 is filled into the filling groove 42 through the threaded hole 44 and the sealing groove 43, ensuring that the thermally conductive buffer silicone ball 6 fills the sealing groove 43. At this point, the sealing silicone sleeve 51 is fitted onto the outside of the lead wire 1 through the sealing hole 53, and the gasket 54 is fitted onto the outside of the lead wire 1 through the second insertion hole 59. Then, the stud 55 is fitted onto the outside of the lead wire 1 through the first insertion hole 58. The sealing silicone sleeve 51 is moved into the sealing groove 43, so that the front end of the gasket 54 fits against the rear end of the sealing silicone sleeve 51, and simultaneously, the front end of the stud 55 spirally fits against the rear end of the threaded hole 44. Manually rotate the operating handle 56, which drives the stud 55 to rotate. As the stud 55 rotates, it gradually moves towards the washer 54. When the steel ball 57 is in contact with the rear end of the washer 54, the steel ball 57 rolls back inside the stud 55. The washer 54 squeezes the sealing silicone sleeve 51. The sealing silicone sleeve 51 deforms due to the presence of the spring cavity 52, so that the outer side of the sealing silicone sleeve 51 is in close contact with the inner side of the stainless steel protective shell 41. At the same time, the inner side of the sealing silicone sleeve 51 is in close contact with the outer side of the wire 1. The sealing silicone sleeve 51 not only seals the opening between the protective sleeve assembly 4 and the wire 1 bracket, but also provides a buffer protection for the wire 1 when subjected to external vibration. The above settings do not require complicated procedures during production and assembly, and also facilitate the maintenance of the device later.

[0035] To ensure the reliability of temperature detection by the NTC thermistor ceramic chip 3, the protective sleeve assembly 4 is made of stainless steel. The protective sleeve assembly 4 directly protects the internal structure and also has good thermal conductivity, allowing it to conduct external heat. The thermally conductive buffer silicone ball 6 is made of high-purity alumina. The thermally conductive buffer silicone ball 6 improves the sensor's thermal conductivity. Its high thermal conductivity allows it to quickly transfer heat from the object being measured to the NTC thermistor ceramic chip 3, thereby improving the sensor's response speed and measurement accuracy, and ultimately enhancing the reliability of temperature measurement. The shape of the thermally conductive buffer silicone ball 6 also provides a certain degree of buffering protection, improving the safety of using the NTC thermistor ceramic chip 3.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An NTC temperature sensor provided with a protective sleeve, comprising a lead wire (1), a lead wire (2) and an NTC thermosensitive ceramic chip (3), characterized in that: The lead wire (1) is attached to the inner side of the sealing and fixing assembly (5), the outer side of the sealing and fixing assembly (5) is attached to the inner side of the protective sleeve assembly (4), and the inner side of the protective sleeve assembly (4) is filled with heat-conducting buffer silica gel balls (6). The sealing and fixing assembly (5) comprises a sealing silica gel sleeve (51), the inner side of the sealing silica gel sleeve (51) is provided with a rebound cavity (52) and a sealing hole (53), the rear end of the sealing silica gel sleeve (51) is attached to the front end of a gasket (54), the rear end of the gasket (54) is attached to the front end of a steel ball (57), the steel ball (57) is embedded and installed at the front end of a stud (55), the rear end of the stud (55) is fixedly connected with an operating handle (56), the inner side of the stud (55) is provided with a first plug-in hole (58), and the inner side of the gasket (54) is provided with a second plug-in hole (59). The outer side of the sealing silica gel sleeve (51) is attached to the inner side of the protective sleeve assembly (4).

2. The NTC temperature sensor provided with a protective sleeve according to claim 1, characterized in that: The protective sleeve assembly (4) comprises a stainless steel protective shell (41), the front half of the stainless steel protective shell (41) is provided with a filling groove (42), the rear half of the stainless steel protective shell (41) is provided with a sealing groove (43) and a threaded hole (44), the front end of the stainless steel protective shell (41) is a plugging structure, the rear end of the stainless steel protective shell (41) is a penetrating structure, and the filling groove (42), the sealing groove (43) and the threaded hole (44) are communicated.

3. The NTC temperature sensor provided with a protective sleeve according to claim 1, characterized in that: The lead wire (2) and the NTC thermosensitive ceramic chip (3) are embedded and installed in the inside of the filling groove (42), the lead wire (1) is embedded and installed in the inside of the sealing groove (43) and the threaded hole (44), the lead wire (1) extends out of the outer side of the protective sleeve assembly (4), and the lead wire (1), the lead wire (2) and the NTC thermosensitive ceramic chip (3) are electrically connected.

4. The NTC temperature sensor provided with a protective sleeve according to claim 1, characterized in that: The heat-conducting buffer silica gel balls (6) are filled in the inside of the filling groove (42), the number of the heat-conducting buffer silica gel balls (6) is multiple, the multiple heat-conducting buffer silica gel balls (6) are attached to the NTC thermosensitive ceramic chip (3), the outer side of the heat-conducting buffer silica gel balls (6) is attached to the inner side of the stainless steel protective shell (41), the shape of the heat-conducting buffer silica gel balls (6) is a hollow spherical body, and the inner side of the heat-conducting buffer silica gel balls (6) is provided with a plurality of arc-shaped grooves.

5. The NTC temperature sensor provided with a protective sleeve according to claim 1, characterized in that: The sealing silica gel sleeve (51) is sleeved on the outer side of the lead wire (1) through the sealing hole (53), the gasket (54) is sleeved on the outer side of the lead wire (1) through the second plug-in hole (59), the stud (55) is sleeved on the outer side of the lead wire (1) through the first plug-in hole (58), the outer side of the heat-conducting buffer silica gel balls (6) at the front end and the rear end of the sealing silica gel sleeve (51) is attached, and the positions of the sealing silica gel sleeve (51), the gasket (54) and the stud (55) are arranged in sequence from front to back.

6. The NTC temperature sensor provided with a protective sleeve according to claim 1, characterized in that: The outer side of the sealing silica gel sleeve (51) is tightly attached to the inner side of the sealing groove (43), the inner side of the sealing silica gel sleeve (51) is tightly attached to the outer side of the lead wire (1), the outer side of the stud (55) is provided with a thread, and the outer side of the stud (55) is spirally attached to the inner side of the threaded hole (44).

7. The NTC temperature sensor provided with a protective sleeve according to claim 1, characterized in that: The stud (55) is provided with a ball groove at the front end, and the steel ball (57) extends out of the front end of the stud (55).

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