High-sensitivity temperature sensor

Abstract

The utility model discloses a high sensitivity temperature sensor, which comprises a connecting pipe and a temperature sensor body, the middle part of the connecting pipe is provided with a plug port, the temperature sensor body comprises a bottom shell, a separator and a thermistor, the lower end of the bottom shell is inserted into the connecting pipe and is in sealing connection with the connecting pipe, and the separator is provided with a plug. The thermistor is located in the bottom shell and close to the lower end of the bottom shell, two electrodes of the thermistor are connected with conducting rods respectively, the upper ends of the conducting rods are fixedly connected with the isolation piece and electrically connected with the plug, and the bottom shell is filled with epoxy resin glue. According to the high-sensitivity temperature sensor, the distance between the thermistor and the outside is prolonged, a heat transfer path is increased, and the influence of the outside temperature on the thermistor is reduced; the sensor is fully filled with epoxy resin glue, so that the internal structural strength of the sensor is improved, rainwater and the like are prevented from invading the sensor to influence the thermistor, and the sensor can accurately sense the temperature change of liquid in the connecting pipe for a long time.

Description

TECHNICAL FIELD

[0001] The utility model belongs to temperature sensor technical field, concretely relates to high sensitivity temperature sensor. BACKGROUND

[0002] In modern industrial production, environmental monitoring, electronic equipment and many other fields, as a key sensing element, the performance of temperature sensor directly affects the accuracy and reliability of the system. With the continuous progress of science and technology, higher and higher requirements are put forward for the sensitivity, stability and response speed of temperature sensor.

[0003] At present, there are many types of temperature sensors on the market, but there are still many problems in the actual application. On the one hand, the structure design of traditional temperature sensor is not reasonable, and the installation position and connection mode of thermistor can easily lead to slow response of the sensor to temperature change, and it is difficult to realize rapid and accurate measurement of temperature. There are common problems in the industry of injection molding temperature sensing, that is, in the dynamic temperature environment, the temperature sensing is not accurate, and some manufacturers even differ by 5 DEG C. The main reason for this problem is that due to heat conduction and other reasons, heat exchange between the inside and outside of the sensor, which causes the thermistor to be affected by the outside temperature, and then the temperature displayed by the sensor is different. Therefore, the existing temperature sensor has many shortcomings in structure design and performance, and cannot meet the increasing demand for high precision and high sensitivity temperature measurement. UTILITY MODEL CONTENTS

[0004] To solve the above technical problems, the utility model adopts the technical scheme of high sensitivity temperature sensor, which comprises a connecting pipe and a temperature sensor body, the middle part of the connecting pipe is provided with a plug-in interface, the temperature sensor body comprises a bottom shell, a spacer and a thermistor, the upper end of the bottom shell is provided with a slot for inserting the spacer, the lower end of the bottom shell is inserted into the connecting pipe from the plug-in interface and is in sealed connection with the connecting pipe, the spacer is located at the upper end of the bottom shell and is in interference fit with the bottom shell, a plug is installed on the spacer, the thermistor is located in the bottom shell and is close to the lower end of the bottom shell, two poles of the thermistor are respectively connected with conductive rods, the upper ends of the conductive rods are fixedly connected with the spacer and are electrically connected with the plug, the inside of the bottom shell is filled with epoxy resin glue, the thermistor passes through the central axis of the connecting pipe or is located below the central axis of the connecting pipe, and the thermistor is a glass-sealed thermistor.

[0005] As a preferred technical scheme of the above, an insulating plate is arranged between the conductive rods, and the insulating plate is fixedly connected with the spacer.

[0006] As a preferred technical scheme of the above, the upper end of the bottom shell is provided with a support table, the upper end of the spacer is provided with a connecting ring, the connecting ring is placed on the support table, the periphery of the connecting ring is provided with an annular protrusion, the upper end of the bottom shell is provided with an annular groove, and the annular protrusion is clamped into the annular groove.

[0007] As the preferred technical scheme, the lower surface of the connecting ring is provided with an accommodating groove formed by being concave upward.

[0008] As the preferred technical scheme, the connecting pipe is provided with a plug at each end.

[0009] As the preferred technical scheme, the length of the conductive rod is greater than 15 mm.

[0010] As the preferred technical scheme, the bottom shell is fixedly connected with an electrical connection section at the upper end, and the plug is located in the electrical connection section.

[0011] The high-sensitivity temperature sensor has the advantages that the distance between the thermistor and the outside world is lengthened, the heat transfer path is increased, and the influence of the outside temperature on the thermistor is reduced; the inside is filled with epoxy resin glue, the internal structural strength of the sensor is improved, the rainwater and the like are prevented from invading the inside of the sensor to affect the thermistor, and the sensor can accurately sense the temperature change of the liquid in the connecting pipe for a long time. BRIEF DESCRIPTION OF DRAWINGS

[0012] Fig. 1 is a cross-sectional structure schematic view of the utility model;

[0013] Fig. 2 is a cross-sectional structure schematic view of the utility model from another angle. DETAILED DESCRIPTION

[0014] The technical scheme of the utility model will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are some of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all the other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.

[0015] In the description of the utility model, it should be explained that the orientation or position relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like is the orientation or position relationship shown in the drawings, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0016] In the description of the utility model, it is necessary to explain, unless another explicit provision and limitation, the term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through the intermediate medium, can be two element internal communication. For ordinary skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to specific circumstances.

[0017] As Figs. 1-2 The high-sensitivity temperature sensor comprises a connecting pipe 1 and a temperature sensor body, the middle part of the connecting pipe 1 is provided with a plug-in interface 2, the temperature sensor body comprises a bottom shell 3, a spacer 4 and a thermistor 5, the upper end of the bottom shell 3 is provided with a slot 6 for inserting the spacer 4, the lower end of the bottom shell 3 is inserted into the connecting pipe 1 from the plug-in interface 2 and is in sealed connection with the connecting pipe 1, the spacer 4 is located at the upper end of the bottom shell 3 and is in interference fit with the bottom shell 3, a plug 7 is installed on the spacer 4, the thermistor 5 is located in the bottom shell 3 and is close to the lower end of the bottom shell 3, two poles of the thermistor 5 are respectively connected with conductive rods 8, the upper ends of the conductive rods 8 are fixedly connected with the spacer 4 and are electrically connected with the plug 7, the inside of the bottom shell 3 is filled with epoxy resin glue, the thermistor 5 passes through the central axis of the connecting pipe 1 or is located below the central axis of the connecting pipe 1, and the thermistor 5 is a glass-sealed thermistor 5. The spacer 4 is preferably made of a material with good insulation and heat insulation effect, such as insulating plastic. The thermistor 5 passes through the central axis of the connecting pipe 1 or is located below the central axis of the connecting pipe 1, which prolongs the length of the bottom shell 3 and prolongs the heat exchange path of the external heat transferred to the lower end of the bottom shell 3 through the bottom shell 3. The glass-sealed thermistor 5 ensures the response time of the thermistor 5. Compared with the epoxy resin-coated thermistor 5, the response time of the glass-sealed thermistor 5 can be improved by about 6 seconds. The epoxy resin glue is filled, which can completely cover the conductive rods 8 and the welding points, preventing water from entering the sensor and affecting the thermistor 5.

[0018] Further, the conductive rods 8 are provided with an insulating plate 9, and the insulating plate 9 is fixedly connected with the spacer 4. The insulating plate 9 is placed between the conductive rods 8 to prevent short circuit.

[0019] Further, the upper end of the bottom shell 3 is provided with a support table 10, the upper end of the spacer 4 is provided with a connecting ring 11, the connecting ring 11 is placed on the support table 10, the periphery of the connecting ring 11 is provided with an annular protrusion 12, the upper end of the bottom shell 3 is provided with an annular groove 13, and the annular protrusion 12 is clamped into the annular groove 13. The support table 10 precisely positions the position of the spacer 4 in the bottom shell 3, and then positions the position of the thermistor 5, so that the thermistor 5 can be assembled in place during the assembly and production process of the sensor, ensuring the product quality.

[0020] Further, the lower surface of the connecting ring 11 is provided with an accommodating groove 14 formed by being concave upward. After the bottom shell 3 is filled with the epoxy resin and the isolation piece 4 is inserted, the excess epoxy resin will enter the accommodating groove 14, so as to ensure the filling amount of the epoxy resin in the bottom shell 3, increase the specific surface area of the isolation piece 4, and improve the bonding strength and sealing effect of the isolation piece 4 and the bottom shell 3.

[0021] Further, the connecting pipe 1 is provided with a plug 15 at each end. The plug 15 facilitates the installation of the sensor.

[0022] Further, the length of the conductive rod 8 is greater than 15 mm. The length of the conductive rod 8 of the conventional sensor is generally less than 14 mm. The conductive rod 8 itself has a certain heat conductivity, so that heat transfer with the outside is easily formed, thereby affecting the thermistor 5, and leading to the error of the measured value of the sensor and the temperature of the liquid in the connecting pipe 1.

[0023] Further, the bottom shell 3 is fixedly connected with an electrical connection section 16 at the upper end, and the plug 7 is located in the electrical connection section 16.

[0024] It is worth mentioning that the glass-sealed thermistor 5, the plug 7 and other technical features involved in the utility model patent application should be regarded as the prior art. The specific structure, working principle and possible control mode and spatial arrangement mode of these technical features can be selected by using the conventional selection in the field, and should not be regarded as the invention point of the utility model patent. The utility model patent will not be further expanded and described in detail.

[0025] The preferred embodiments of the utility model are described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the utility model without creative labor, so that the technical solutions obtained by logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the utility model should be within the protection scope determined by the claims.

Claims

1. A high sensitivity temperature sensor characterized by, The temperature sensor comprises a connecting pipe and a temperature sensor body, a middle part of the connecting pipe is provided with a plug-in interface, the temperature sensor body comprises a bottom shell, a spacer and a thermistor, an upper end of the bottom shell is provided with a slot for inserting the spacer, a lower end of the bottom shell is inserted into the connecting pipe from the plug-in interface and is in sealed connection with the connecting pipe, the spacer is located at the upper end of the bottom shell and is in interference fit with the bottom shell, a plug is installed on the spacer, the thermistor is located in the bottom shell and is close to the lower end of the bottom shell, two poles of the thermistor are respectively connected with conductive rods, upper ends of the conductive rods are fixedly connected with the spacer and are electrically connected with the plug, the inside of the bottom shell is filled with epoxy resin glue, the thermistor passes through a middle axis of the connecting pipe or is located below the middle axis of the connecting pipe, and the thermistor is a glass-sealed thermistor.

2. The high sensitivity temperature sensor of claim 1, wherein, Insulating plates are arranged between the conductive rods and are fixedly connected with the spacer.

3. The high sensitivity temperature sensor of claim 1, wherein, The upper end of the bottom shell is provided with a support table, an upper end of the spacer is provided with a connecting ring, the connecting ring is arranged on the support table, the connecting ring is provided with an annular protrusion around the connecting ring, the upper end of the bottom shell is provided with an annular groove around the bottom shell, and the annular protrusion is clamped into the annular groove.

4. The high sensitivity temperature sensor of claim 3, wherein, A lower surface of the connecting ring is provided with an accommodating groove which is formed by being concave upward.

5. The high sensitivity temperature sensor of claim 1, wherein, The connecting pipe is provided with plug-in interfaces at two ends thereof.

6. The high sensitivity temperature sensor of claim 1, wherein, The length of the conductive rod is greater than 15 mm.

7. The high sensitivity temperature sensor of claim 1, wherein, The upper end of the bottom shell is fixedly connected with an electrical connection section, and the plug is located in the electrical connection section.

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