Anti-interference temperature sensor

Abstract

The utility model discloses an anti-interference temperature sensor comprising a housing, a cylindrical sleeve, a temperature sensor probe, a circuit board, an A / D conversion chip and a connection terminal. A probe cavity is formed in the end of the cylindrical sleeve, a first hollow groove is formed in the probe cavity in the circumferential direction in a surrounding mode, the temperature sensor probe is located in the probe cavity and connected with the A / D conversion chip, the circuit board is arranged in the shell, the inner wall of the shell is coated with a carbon nano tube coating, an epoxy resin layer is encapsulated in the shell, and the temperature sensor probe is connected with the A / D conversion chip. The connecting terminal is arranged on the circuit board. According to the utility model, the first hollow groove is arranged on the probe cavity, so that airflow pressure can be dispersed, and impact of high-speed airflow on the temperature sensor probe is reduced; the temperature sensor probe is connected with the A / D conversion chip, analog signals can be converted into digital signals, and electromagnetic interference in the transmission process is avoided. And the epoxy resin layer is filled in the gap in the shell, so that the circuit board can be protected, and the service life of the sensor is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to temperature sensor field especially relates to an anti -interference temperature sensor. BACKGROUND

[0002] Temperature sensor is for detecting environmental temperature change, and it is converted into readable electric signal electronic device, is widely used in industrial control, automobile electronics, environmental monitoring and air conditioning system etc.

[0003] Because the airflow temperature sensor needs to work in the high-speed airflow environment, and the probe of the traditional temperature sensor is generally exposed, under the impact of strong airflow, it is easy to be affected by turbulence and transient temperature change, resulting in large fluctuation of measurement data, unstable response, in addition, the shielding capacity of the traditional airflow temperature sensor is insufficient, and analog signal output is also adopted, which is easy to be disturbed in the long-distance transmission process, thereby causing signal distortion and affecting the measurement precision.

[0004] Therefore, the prior art has defects and needs to be improved. UTILITY MODEL CONTENT

[0005] The utility model solves the technical problem that provides a kind of temperature sensor of high measurement precision, structural stability of anti-interference.

[0006] To achieve this purpose, the utility model adopts the following technical solutions: a kind of temperature sensor of anti-interference, including shell, cylindrical sleeve, temperature sensor probe, circuit board, A / D conversion chip and connecting terminal;

[0007] The cylindrical sleeve is arranged on the shell, the end of the cylindrical sleeve is provided with a probe cavity, the first hollow slot is arranged around the probe cavity in the circumferential direction, and the temperature sensor probe is located in the probe cavity;

[0008] The circuit board is arranged in the shell, the A / D conversion chip is arranged on the circuit board, the temperature sensor probe passes through the probe cavity and is connected with the A / D conversion chip;

[0009] The inner wall of the shell is coated with a carbon nanotube coating, the shell is filled with an epoxy resin layer, and the epoxy resin layer is used to coat and protect the circuit board;

[0010] The connecting terminal is arranged on the circuit board and exposed at the bottom of the shell.

[0011] Adopting the technical scheme, the anti-interference temperature sensor has the second hollow groove arranged on the end face of the probe cavity away from the shell in a circumferential direction.

[0012] Adopting the technical scheme, the anti-interference temperature sensor further comprises a sealing ring, the annular positioning groove is arranged between the probe cavity and the shell, and the sealing ring is arranged on the annular positioning groove.

[0013] Adopting the technical scheme, the anti-interference temperature sensor further comprises a silica gel sheath, the silica gel sheath is arranged on the side wall of the probe cavity, and the silica gel sheath is used for coating the temperature sensor probe.

[0014] Adopting the technical scheme, the anti-interference temperature sensor has the carbon nanotube coating layer with a thickness of 30-100 mu m.

[0015] Adopting the technical scheme, the anti-interference temperature sensor has at least two connecting terminals.

[0016] Adopting the technical scheme, the anti-interference temperature sensor has the cylindrical sleeve vertically arranged on the end face of the shell, and the cylindrical sleeve and the shell are integrally formed by injection molding.

[0017] Adopting the technical scheme, the anti-interference temperature sensor has the temperature sensor probe being an NTC probe or an RTD probe.

[0018] Compared with the prior art, the anti-interference temperature sensor has the following beneficial effects:

[0019] The first hollow groove is arranged on the probe cavity, so that the air flow pressure can be dispersed, thereby reducing the impact of high-speed air flow on the temperature sensor probe; the temperature sensor probe is connected with the A / D conversion chip on the circuit board, so that the analog signal can be converted into a digital signal, electromagnetic interference of the analog signal in the transmission process is avoided, the carbon nanotube coating layer is coated on the inner wall of the shell, so that the external electromagnetic interference can be blocked, and the stability of the measurement signal transmission is improved; the epoxy resin layer can fill the gap between the circuit board and the shell, so that the circuit board is protected, and the service life of the temperature sensor is effectively prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to these drawings without paying the creativity labor intensity.

[0021] The structure, proportion, size and the like shown in the drawings of the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and do not have technical substantive significance, and any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effects and purposes that can be achieved by the utility model, should still fall within the scope of the technical content disclosed by the utility model.

[0022] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0023] Figure 2 It is a schematic diagram of the circuit board structure of the utility model;

[0024] Figure 3 It is a schematic diagram of the overall structure of the utility model from another perspective. DETAILED DESCRIPTION

[0025] In order to make the utility model purposes, features and advantages of the utility model more obvious and easy to understand, the technical solutions in the embodiments of the utility model will be described clearly and completely below in combination with the drawings in the embodiments of the utility model. Obviously, the embodiments described below are only a part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0026] In the description of the utility model, it should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the utility model and simplify the description, and do not indicate or imply that the devices or elements referred to 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. It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or there can be a component disposed therebetween.

[0027] The technical solutions of the utility model will be further described below in combination with the drawings and through specific embodiments.

[0028] As Figures 1 to 3 shown, the utility model embodiment provides an anti-interference temperature sensor, which comprises a shell 1, a cylindrical sleeve 2, a temperature sensor probe 3, a circuit board 4, an A / D conversion chip 5 and a connecting terminal 6.

[0029] The cylindrical sleeve 2 is arranged on the shell 1, and the end of the cylindrical sleeve 2 is provided with a probe cavity 21, and the probe cavity 21 is circumferentially provided with a first hollow groove 22, and the temperature sensor probe 3 is located in the probe cavity 21; the first hollow groove 22 can play a flow stabilizing role, so that the airflow is buffered before contacting the temperature sensor probe 3, thereby reducing the interference of high-speed airflow and isolating part of the mechanical impact.

[0030] The circuit board 4 is arranged in the shell 1, the A / D conversion chip 5 is arranged on the circuit board 4, the temperature sensor probe 3 passes through the probe cavity 21 and is connected with the A / D conversion chip 5; the A / D conversion chip 5 can convert the analog signal output by the temperature sensor probe 3 into a digital signal, so that the temperature data is output in a more stable form, avoiding measurement errors caused by external electromagnetic interference, thereby improving the measurement accuracy.

[0031] The inner wall of the shell 1 is coated with a carbon nanotube coating, and the shell 1 is filled with an epoxy resin layer (not shown), which is used to cover and protect the circuit board 4; the carbon nanotube coating has good electromagnetic shielding performance, can absorb and suppress external electromagnetic interference, and improve the stability of the measurement signal transmission; the epoxy resin layer can firmly cover the circuit board 4, so that it is not affected by external mechanical vibration, impact and moisture, and avoids problems such as loosening of electronic components, cracking or short circuit of solder joints caused by long-term work; in addition, the epoxy resin layer also has an insulating protection effect, which prevents the circuit board 4 from being damp or signal interference due to the invasion of external moisture or dust, thereby prolonging the service life of the sensor.

[0032] The connecting terminal 6 is arranged on the circuit board 4 and exposed at the bottom of the shell 1. When the temperature sensor probe 3 collects airflow temperature information, the signal is processed by the A / D conversion chip 5 on the circuit board 4, converted into a digital signal, and then output to an external system through the connecting terminal 6.

[0033] As shown in Figure 2 Further, the second hollow groove 23 is circumferentially arranged on the end face of the probe cavity 21 away from the shell 1, and the arrangement of the second hollow groove 23 can improve the flow of the airflow.

[0034] As shown in Figure 1 Further, it further comprises a sealing ring 24, an annular positioning groove 25 is arranged between the probe cavity 21 and the shell 1, and the sealing ring 24 is arranged on the annular positioning groove 25; the cylindrical sleeve 2 can facilitate the insertion and fixation of the temperature sensor in the pipeline interface, and the sealing ring 24 can prevent external pollutants from entering the shell 1 through the gap, and the sealing ring 24 also has a buffering and damping effect, improves the installation stability, and prevents the temperature sensor from loosening and falling off due to long-term vibration.

[0035] As Figure 1 and Figure 3 Further, a silica gel sheath 26 is arranged on the sidewall of the probe cavity 21, and the silica gel sheath 26 is used for covering the temperature sensor probe 3. The silica gel sheath 26 can reduce the impact of high-speed airflow on the temperature sensor probe 3, and avoid signal drift caused by loose temperature sensor probe 3 due to external force.

[0036] Further, the thickness of the carbon nanotube coating layer is 30-100 μm. In the embodiment, the thickness of the carbon nanotube coating layer is 40 μm.

[0037] As Figure 1 and Figure 2 Further, the number of the connecting terminals 6 is at least two. In the embodiment, the number of the connecting terminals 6 is four, which can avoid signal coupling and interference caused by too many shared lines, thereby improving the accuracy of temperature measurement.

[0038] As Figure 1 and Figure 3 Further, the cylindrical sleeve 2 is vertically arranged on the end surface of the shell 1, and the cylindrical sleeve 2 and the shell 1 are integrally formed by injection molding. In this way, the structural strength of the whole can be improved.

[0039] Further, the temperature sensor probe 3 is an NTC probe or an RTD probe. In the embodiment, the temperature sensor probe 3 is an NTC probe. The NTC probe has low power consumption and a large resistance change range, and can be matched with the A / D conversion chip 5 without additional signal amplification circuit, thereby simplifying the circuit structure and improving the reliability of measurement.

[0040] The above-described embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An interference-resistant temperature sensor, characterized by, The temperature sensor probe, the circuit board, the A / D conversion chip and the connecting terminal are arranged in the shell. The cylindrical sleeve is arranged on the shell, and the cylindrical sleeve is provided with a probe cavity at the end thereof. The circuit board is arranged in the shell, the A / D conversion chip is arranged on the circuit board, and the temperature sensor probe is connected with the A / D conversion chip through the probe cavity. The inner wall of the shell is coated with a carbon nanotube coating, and the shell is filled with an epoxy resin layer inside. The connecting terminal is arranged on the circuit board and exposed at the bottom of the shell.

2. The tamper-resistant temperature sensor of claim 1, wherein, The probe cavity is provided with a second hollow groove in the circumferential direction away from the end face of the shell.

3. The tamper-resistant temperature sensor of claim 1, wherein, The probe cavity and the shell are provided with an annular positioning groove, and the sealing ring is arranged on the annular positioning groove.

4. The tamper-resistant temperature sensor of claim 1, wherein, The silica gel sheath is arranged on the side wall of the probe cavity, and the silica gel sheath is used for covering the temperature sensor probe.

5. The tamper-resistant temperature sensor of claim 1, wherein, The thickness of the carbon nanotube coating is 30-100 μm.

6. The tamper-resistant temperature sensor of claim 1, wherein, The number of the connecting terminal is at least two.

7. The tamper-resistant temperature sensor of claim 1, wherein, The cylindrical sleeve is arranged vertically on the end face of the shell, and the cylindrical sleeve and the shell are integrally formed by injection molding.

8. The tamper-resistant temperature sensor of any one of claims 1-7, wherein, The temperature sensor probe is an NTC probe or an RTD probe.

Images