阅读说明：本技术 一种加速度传感器的热防护结构 (Thermal protection structure of acceleration sensor ) 是由 苏秀红 李翀 胡宇鹏 王泽� 于 2019-12-20 设计创作，主要内容包括：本发明公开了一种加速度传感器的热防护结构,包括隔热外壳、底座；底座与测试产品连接,底座与测试产品之间设置有第一间隙；隔热外壳安装在底座上并形成封闭的内部空间,传感器安装于内部空间内的底座上；在底座内设置用用于底座散热的水冷结构；在内部空间中填充满相变材料；在相变材料与传感器的外壁之间设置有第二间隙。本发明通过在隔热外壳与传感器之间填充相变材料,增强了对传感器的隔热效果；通过在底座与测试产品之间的分布式安装方式,避免产品与隔热底座的直接接触,极大地减小了热传递。(The invention discloses a thermal protection structure of an acceleration sensor, which comprises a heat insulation shell and a base; the base is connected with the test product, and a first gap is formed between the base and the test product; the heat insulation shell is arranged on the base and forms a closed inner space, and the sensor is arranged on the base in the inner space; a water cooling structure used for heat dissipation of the base is arranged in the base; filling the internal space with a phase change material; a second gap is provided between the phase change material and the outer wall of the sensor. According to the invention, the phase-change material is filled between the heat insulation shell and the sensor, so that the heat insulation effect on the sensor is enhanced; by means of the distributed installation between the base and the test product, direct contact of the product with the heat insulation base is avoided, and heat transfer is greatly reduced.)

1. A thermal protection structure of an acceleration sensor, comprising:

a thermally insulated housing;

a base; the base is connected with the test product, and a first gap is formed between the base and the test product; the heat insulation shell is arranged on the base and forms a closed inner space, and the sensor is arranged on the base in the inner space; a water cooling structure used for heat dissipation of the base is arranged in the base.

2. The thermal protection structure of an acceleration sensor of claim 1, characterized in that, the inner space is filled with phase change material.

3. The thermal protection structure of an acceleration sensor of claim 2, characterized in, that between the phase change material and the outer wall of the sensor is provided a second gap.

4. The thermal protection structure of an acceleration sensor of claim 1, characterized in that, there is a hole on the heat insulation shell for the sensor wire to pass through, and the hole is sealed by asbestos after the sensor wire passes through the hole.

5. The thermal protection structure for an acceleration sensor according to claim 3, characterized in that, a suction hole is provided on the heat insulation housing, the suction hole is blocked when not in use, and all the spaces of the heat insulation housing including the second gap are converted into a vacuum environment through the suction hole.

6. The thermal protection structure of an acceleration sensor according to claim 1, characterized in that, the thermal insulation casing is made of zirconia fiber board, and the outer wall of the thermal insulation casing is plated with a reflective film.

7. The thermal protection structure of an acceleration sensor according to claim 6, characterized in that the wall thickness of the thermal insulation case is 2mm-6 mm.

8. The thermal protection structure of an acceleration sensor of claim 1, characterized in that, the thermal insulation base is made of zirconia.

9. The thermal protection structure of an acceleration sensor of claim 8, characterized in that, the thickness of the thermal insulation base is 5mm-10 mm.

10. The thermal protection structure of an acceleration sensor of claim 1, characterized in that, the water cooling structure comprises a water channel disposed in the base and connected to the base, and a water inlet and a water outlet are disposed on the base and connected to two ends of the water channel respectively.

Technical Field

The invention belongs to the technical field of acceleration sensor protection, and particularly relates to a thermal protection structure of an acceleration sensor.

Background

The temperature and vibration composite test can simulate complex mechanical environments such as vibration, overload and noise in the weapon flight process, and therefore the temperature and vibration composite test has attracted wide attention at home and abroad in recent years. When the acceleration is measured by adopting a contact method in a high-temperature vibration composite test, a high requirement is provided for the temperature resistance of the sensor, if the test temperature exceeds the temperature resistance range of the sensor, the sensitivity of the sensor has large deviation, and the accurate acceleration is difficult to obtain by only depending on the sensitivity correction of a temperature response curve. When the temperature is too high, sensitive elements in the acceleration sensor can be damaged, so that the sensor fails. At present, the highest tolerable temperature of a foreign sensor can reach 650 ℃, but the sensor is large in size, the problems of low-frequency response deterioration and the like can occur in the practical use process, and the high-temperature resistant sensor is actively developed at home, but the tolerable temperature is not high at present.

In order to solve the above problems, the inventor developed a thermal protection structure of an acceleration sensor.

Disclosure of Invention

The present invention is directed to solving the above problems and providing a thermal protection structure for an acceleration sensor.

The invention realizes the purpose through the following technical scheme:

a thermal protection structure of an acceleration sensor, comprising:

a thermally insulated housing;

a base; the base is connected with the test product, and a first gap is formed between the base and the test product; the heat insulation shell is arranged on the base and forms a closed inner space, and the sensor is arranged on the base in the inner space; a water cooling structure used for heat dissipation of the base is arranged in the base.

Specifically, the internal space is filled with a phase change material.

Further, a second gap is provided between the phase change material and the outer wall of the sensor.

Specifically, a hole for a sensor lead to pass through is formed in the heat insulation shell, and the hole is plugged by asbestos after the sensor lead passes through the hole.

Specifically, the heat insulation shell is provided with an air extraction hole, the air extraction hole is sealed when the heat insulation shell is not used, and all spaces of the heat insulation shell including the second gap are converted into a vacuum environment through the air extraction hole.

Preferably, the heat insulation shell is made of zirconia fiber board, and the outer wall of the heat insulation shell is plated with a reflecting film.

Further preferably, the wall thickness of the insulating enclosure is 2mm to 6 mm.

Preferably, the heat insulating base is made of zirconia.

Further preferably, the thickness of the heat insulation base is 5mm-10 mm.

Specifically, the water cooling structure comprises a water flow channel which is arranged in the base and communicated with the base, a water inlet and a water outlet are arranged on the base, and the water inlet and the water outlet are respectively connected with two ends of the water flow channel.

The invention has the beneficial effects that:

1. the phase-change material is filled between the heat insulation shell and the sensor, so that the heat insulation effect on the sensor is enhanced;

2. a distributed installation mode between the base and the test product is provided, direct contact between the product and the heat insulation base is avoided, and heat transfer is greatly reduced.

Drawings

Fig. 1 is a schematic structural diagram of the present application.

In the figure: 1. a thermally insulated housing; 2. a phase change material; 3. an air exhaust hole; 41. a water inlet; 42. a water outlet; 5. a sensor wire; 6. a bolt; 7. a sensor; 8. producing a product; 81. a first gap; 9. a base; 10. a second gap.

Detailed Description

The invention will be further described with reference to the accompanying drawings in which:

as shown in fig. 1, a thermal protection structure of an acceleration sensor includes:

a heat-insulating casing 1;

a base 9; the base 9 is connected with the test product 8, and a first gap 81 is arranged between the base 9 and the test product 8; the heat insulation shell 1 is arranged on a base 9 and forms a closed inner space, and the sensor 7 is arranged on the base 9 in the inner space; a water cooling structure for dissipating heat from the base 9 is provided in the base 9.

In some embodiments, the base 9 is formed in a cuboid-type structure, with the bottom surface of the base 9 being parallel to the surface of the test product 8;

in some embodiments, the base 9 is connected with the test product 8 through at least two bolts 6, screw holes are arranged on the base 9, and screw holes are arranged on the test product 8; the bolts 6 are screwed in from the screw holes in the base 9 and then into the screw holes in the test product 8, but still ensuring a first gap 81 between the base 9 and the test product 8. In the present embodiment, rigid transmission of the vibration response characteristic can be ensured by increasing the rigidity of the fastening bolt 6.

In some embodiments, the first gap 81 is preferably about 4 mm.

In some embodiments, the heat insulation shell 1 and the base 9 and the sensor 7 are bonded by high-temperature glue.

As shown in fig. 1, the internal space is filled with a phase change material 2. Preferably a paraffin phase change material 2, the phase change material 2 being capable of accomplishing heat storage by virtue of the latent heat change of the material upon phase transition.

As shown in fig. 1, a second gap 10 is provided between the phase change material 2 and the outer wall of the sensor 7. The second gap 10 is provided to avoid that the additional mass has an influence on the vibrational response of the sensor 7.

As shown in fig. 1, a hole for passing the sensor lead 5 is formed in the heat insulation casing 1, and the hole is blocked by asbestos after the sensor lead 5 passes through the hole.

As shown in fig. 1, an air exhaust hole 3 is provided on the heat insulating housing 1, the air exhaust hole 3 is blocked when not in use, and all the space of the heat insulating housing 1 including the second gap 10 is converted into a vacuum environment through the air exhaust hole 3. As the zirconia fiber board of the material of the heat insulation shell 1 is provided with a plurality of small holes, the heat insulation effect of the structure can be enhanced after the heat insulation shell is vacuumized.

In some embodiments, the heat insulation housing 1 is made of zirconia fiber board, and a reflective film is plated on the outer wall of the heat insulation housing 1; the wall thickness of the heat insulation shell 1 is 2mm-6 mm.

The zirconia fiberboard material has better heat insulation performance than alumina fiber and alumina silicate fiber, the heat conductivity can be controlled below 0.1W/mK through preparation, the size of the heat insulation shell 1 can be changed according to the size of the sensor 7, and in order to reduce heat conduction, the wall thickness of the shell is considered to be 2-6 mm. The surface of the heat insulation shell 1 is plated with a reflecting film for reflecting heat radiation.

In some embodiments, the thermally insulating base 9 is made of zirconia. The thickness of the heat insulation base 9 is 5mm-10 mm. The base 9 is made of zirconia, the thermal conductivity is 2-4W/mK, and the hardness of the material is enough for the requirement of a vibration test.

As shown in fig. 1, the water cooling structure includes a water flow channel (not shown in the figure) disposed in the base 9 and communicated with the base 9, and a water inlet 41 and a water outlet 42 are disposed on the base 9, and the water inlet 41 and the water outlet 42 are respectively connected to two ends of the water flow channel. The heat insulation base 9 is added with a water cooling structure, and water cooling is circulated in the test process to take away part of heat.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.