Temperature sensor

Abstract

The utility model relates to the technical field of sensors, and discloses a temperature sensor, which comprises a base and a mounting end at the front end of the base, a cavity is formed in the mounting end, a probe is fixedly arranged at the lower end of the cavity through a hollow support, the upper end of the probe extends into the cavity, and the lower end of the probe extends out of the hollow support. On the premise that the length of the sensor is not increased, a medium space is formed outside the probe, so that the probe is in full contact with a measured medium, the effective heat transfer of the measured medium is increased, and the probe can fully and quickly respond to the temperature change of the medium.

Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a temperature sensor. Background Art

[0002] In aerospace and industrial applications, invasive temperature sensors are required to measure medium temperature. In precision measurement situations, the sensor is not only required to be highly accurate and fast in response, but also to be small in size and short in probe length due to the limitations of installation space and pipe diameter.

[0003] See attached Figure 6 The temperature sensing module of the traditional invasive temperature sensor is composed of a thermal sensitive element 1, a probe 2, a thermal conductive adhesive 3, and a base 4. The probe 2 is a hollow part, the thermal sensitive element 1 is installed in the probe 2, and the thermal conductive adhesive 3 is poured into the probe 2.

[0004] The thermal sensitive element can accurately calculate the temperature value through the thermal resistance and thermocouple induction principles. The sensor can be a passive temperature sensor or an active temperature transmitter.

[0005] See attached Figure 7 When the existing temperature sensor is working, when the temperature of the measured medium in the pipe 5 changes, the heat is transferred to the thermal sensitive element 1 through the probe 2 and the thermal conductive glue 3. The resistance value of the thermal sensitive element changes with the change of the medium temperature, and the resistance value has a strong correlation with the temperature of the measured medium. In the following description, we assume that the temperature of the measured medium is higher than the outside temperature, which is convenient for describing the phenomenon. If the temperature of the measured medium is lower than the outside temperature, the heat flow is in the opposite direction, so it does not affect the validity of this patent.

[0006] From the attached Figure 7 It can be seen that due to the influence of the outside world, the temperature of the base will be lower than the temperature of the measured medium. A large amount of heat is transferred from the probe to the base, thus affecting the temperature and rise time of the heat sensitive element, and directly affecting the measurement accuracy.

[0007] Therefore, in order to transfer heat more effectively through the probe 2 to the thermal conductive adhesive 3 and be detected by the thermal sensitive element 1, the probe 2 should be inserted further into the medium. This method increases the conduction length between the thermal sensitive element and the base, which can effectively reduce heat loss. This method is limited by the actual installation space, such as when the pipe diameter of the medium to be measured is very small. Utility Model Content

[0008] The utility model aims to solve the above problems and provides a temperature sensor, which forms a medium space between the probe and the base to ensure that the probe can fully and quickly respond to the temperature change of the medium.

[0009] The technical solution adopted by the utility model is:

[0010] A temperature sensor is characterized in that it includes a base and a mounting end at the front end of the base, a cavity is formed in the mounting end, a probe is fixedly arranged at the lower end of the cavity through a hollow bracket, the upper end of the probe extends into the cavity, and the lower end extends out of the hollow bracket.

[0011] Furthermore, the thermal sensitive element of the probe is located inside the lower end of the probe.

[0012] Furthermore, an end cover is provided at the upper end of the cavity, and the signal line of the probe is led out from the end cover.

[0013] Furthermore, the hollow bracket is sleeved inside the lower end of the cavity, a mounting hole is formed in the middle, and a channel is formed outside the mounting hole.

[0014] Furthermore, the heat sensitive element is fixed inside the probe by means of heat conductive adhesive, and the heat conductive adhesive fills the inside of the probe.

[0015] Furthermore, the mounting end is provided with an external thread section, and a sealing ring is provided between the mounting end and the base.

[0016] The beneficial effects of the utility model are:

[0017] (1) Without increasing the overall length of the sensor, the cavity formed by the probe and the base allows high-temperature media to enter, thereby cutting off the heat loss between the probe and the base; further, the high-temperature media entering the cavity can increase the heat conduction area of ​​the probe and increase the temperature of the probe close to the base, which makes the overall temperature of the probe increase faster, increasing the temperature rise rate of the thermal sensitive element, so that it can more accurately reflect the temperature value of the medium; BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Attached Figure 1 It is a schematic diagram of the planar structure of the temperature sensor of the utility model;

[0019] Attached Figure 2 Yes Figure 1 A schematic cross-sectional view of a temperature sensor;

[0020] Attached Figure 3 It is a schematic diagram of the three-dimensional structure of the temperature sensor;

[0021] Attached Figure 4 It is a schematic diagram of heat transfer when the temperature sensor is working;

[0022] Attached Figure 5 It is the response curve diagram of the new and old schemes to measure temperature;

[0023] Attached Figure 6 It is a schematic cross-sectional view of a temperature sensor in the prior art;

[0024] Attached Figure 7 It is a schematic diagram of heat transfer when the temperature sensor in the prior art is working.

[0025] The reference numerals in the accompanying drawings are:

[0026] 1. Thermosensitive element; 2. Probe;

[0027] 3. Thermal conductive adhesive; 4. Base;

[0028] 5. Pipeline; 6. Installation end;

[0029] 7. Sealing ring; 8. Cavity;

[0030] 9. Hollow bracket; 10. Passageway. DETAILED DESCRIPTION

[0031] The specific implementation of the temperature sensor of the present utility model is described in detail below with reference to the accompanying drawings.

[0032] See attached Figures 1 to 3 The temperature sensor of the utility model comprises a base 4 and a mounting end 6 at the front end of the base 4, the mounting end 6 is used to mount the sensor on a pipe 5, the mounting end 6 is provided with an external thread, and matches with a threaded hole on the pipe 5. A sealing ring 7 can be provided at the root of the thread.

[0033] A cavity 8 is formed in the mounting end 6, and the lower end of the cavity 8 is fixed with the probe 2 through a hollow bracket 9. The upper end of the probe 2 extends into the cavity 8, and the lower end extends out of the hollow bracket 9. The thermal sensitive element 1 of the probe 2 is located inside the lower end of the probe 2. The thermal sensitive element 1 is fixed inside the probe 2 by a thermal conductive adhesive 3, and the thermal conductive adhesive 3 fills the inside of the probe 2.

[0034] The upper end of the cavity 8 extends to the inside of the base 4, and an end cover is provided at the upper end. The signal line of the probe 2 is led out from the end cover, and then extends out from the top of the base 4 to be connected to the detection equipment.

[0035] The hollow bracket 9 is sleeved inside the lower end of the cavity 8, a mounting hole is formed in the middle, and a channel 10 is formed outside the mounting hole.

[0036] See attached Figure 4 When the temperature sensor is installed on the pipe 5, the lower end of the probe 2 extends from the installation end 6 into the medium of the pipe 5. Due to the structure of the hollow bracket 9, the medium enters the cavity 8 from the hollow bracket 9 when flowing, and the cavity 8 is filled with the medium. The medium quickly surrounds the probe 2, so that the probe 2 quickly receives the temperature change of the medium, and the thermal sensitive element 1 timely senses the temperature signal, thereby improving the response speed and detection accuracy of the sensor.

[0037] Attached Figure 4In the embodiment, after the medium enters the cavity 8 from the hollow support 9, the heat is transferred to the entire probe 2 along with the medium, and the effective heat energy covers the probe 2, greatly improving the measurement accuracy.

[0038] See attached Figure 5 After simulating and calculating the thermal conductivity, the temperature sensor in the prior art and the temperature sensor of the present invention were placed in a medium at 100°C from room temperature, and the time for the two solutions to reach 60°C (100°C*60%=60°C) was calculated. The calculation showed that the response time of the innovative solution was reduced by more than 50% compared with the mature solution. This has a very positive significance in the precise measurement occasions with very high response time.

[0039] The above are only preferred implementations of the present invention. It should be pointed out that ordinary technicians in this technical field can make several improvements and modifications without departing from the principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A temperature sensor, characterized in that: It comprises a base and a mounting end at the front end of the base, wherein a cavity is formed in the mounting end, a probe is fixedly arranged at the lower end of the cavity through a hollow bracket, the upper end of the probe extends into the cavity, and the lower end extends out of the hollow bracket.

2. The temperature sensor according to claim 1, characterized in that: The thermal sensitive element of the probe is located inside the lower end of the probe.

3. The temperature sensor according to claim 1, characterized in that: An end cover is arranged at the upper end of the cavity, and a signal line of the probe is led out from the end cover.

4. The temperature sensor according to any one of claims 1 to 3, characterized in that: The hollow bracket is sleeved inside the lower end of the cavity, a mounting hole is formed in the middle, and a channel is formed outside the mounting hole.

5. The temperature sensor according to claim 2, characterized in that: The heat sensitive element is fixed inside the probe by means of heat conductive adhesive, and the heat conductive adhesive fills the inside of the probe.

6. The temperature sensor according to any one of claims 1 to 3, characterized in that: The mounting end is provided with an external thread section, and a sealing ring is provided between the mounting end and the base.

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