Temperature adjusting system for sky-direction accelerometer and acceleration sensor

Abstract

The invention discloses a temperature adjusting system for a sky-direction accelerometer. The temperature adjusting system comprises a temperature equalizing shell, a heat conduction pad and a heating film. The heat conduction pad is laid on the inner bottom face of the temperature equalizing shell, and the heating film is arranged on the outer bottom face of the temperature equalizing shell. The bottom surface of the sky accelerometer is placed on the heat conducting pad; and the sky accelerometer and the upper edge of the temperature equalizing shell are connected with the gauge adding seat. The invention also discloses an acceleration sensor. The temperature adjusting system has the beneficial effects that the temperature of the sky-oriented accelerometer is adjusted through heating of the heating film, so that the sky-oriented accelerometer is located in a stable temperature field, the interference of external environment temperature change on the sky-oriented accelerometer is reduced, the sensitivity of the sky-oriented accelerometer to the external environment temperature is reduced, and the sensitivity of the sky-oriented accelerometer to the external environment temperature is improved. And the performance of the sky-direction accelerometer is improved.

Description

Technical Field

[0001] This invention relates to temperature control technology, specifically a temperature regulation system and an acceleration sensor for an astronomical accelerometer. Background Technology

[0002] In the field of gravity measurement, the measurement accuracy of a gravimeter depends on the performance of its core sensors, among which the accelerometer, as a key sensitive component, is the core element that determines the measurement resolution and stability.

[0003] Accelerometer physical characteristics are greatly affected by temperature; therefore, the industry commonly designs temperature control systems to create a stable temperature field. Gravimeter accelerometer sensors typically employ three orthogonal accelerometers to measure acceleration in the X, Y, and Z directions. The Z-axis accelerometer, because it directly corresponds to the measurement of the vertical component of gravity, has a more significant impact on the overall results, and its resolution and stability requirements are more stringent. This necessitates that the temperature control system for the Z-axis accelerometer achieve higher precision control and stronger anti-interference capabilities. However, existing temperature control systems do not provide special treatment for the Z-axis accelerometer, or only offer heat insulation, resulting in insufficient output accuracy and susceptibility to ambient temperature fluctuations.

[0004] Therefore, designing a temperature control system for the astronomical accelerometer is key to improving the overall performance of the accelerometer and gravimeter.

[0005] Purpose of the invention The purpose of this invention is to address the shortcomings of existing technologies by providing a temperature regulation system and accelerometer for an astronomical accelerometer, aiming to reduce the sensitivity of the astronomical accelerometer to ambient temperature.

[0006] The technical solution adopted in this invention is: a temperature regulation system for an astronomical accelerometer, comprising a temperature-equalizing shell, a thermal pad, and a heating film; The thermal pad is laid on the inner bottom surface of the uniform temperature shell, and the heating film is disposed on the outer bottom surface of the uniform temperature shell; The bottom of the accelerometer is placed on a thermal pad, and the upper edge of the accelerometer and the temperature equalization housing are connected to the accelerometer base.

[0007] According to the above scheme, the temperature regulation system also includes an oil seal structure, which includes a heat-insulating upper cover. The lower end of the heat-insulating upper cover is connected to the gauge base. The axial accelerometer is located inside the heat-insulating upper cover. The outer top of the axial accelerometer and the inner wall of the heat-insulating upper cover form an oil cavity for injecting heat-conducting oil. The heat-insulating upper cover has an oil injection port.

[0008] According to the above scheme, a sealing connector is installed on the heat insulation cover, and the inner end of the sealing connector is connected to the axial accelerometer via a cable.

[0009] According to the above scheme, the temperature equalization shell is a copper shell; the temperature equalization shell is a cylinder adapted to the body of the astronomical accelerometer, with one end of the cylinder open and the other end closed; the heating film is disposed on the outer bottom surface of the closed end of the cylinder; the open end of the cylinder extends radially outward, and the extended part is located between the connection part of the astronomical accelerometer and the accelerometer base, and the three are connected together.

[0010] According to the above scheme, a heat insulation lower cover is provided on the lower outer side of the temperature equalization shell, and the upper end of the heat insulation lower cover is connected to the gauge base.

[0011] According to the above scheme, the oil filling port is equipped with a sealing knob, and the sealing knob is equipped with a sealing gasket.

[0012] According to the above scheme, a heat insulation pad is placed between the extension of the temperature equalization shell and the gauge base.

[0013] According to the above scheme, a temperature sensor is installed on the bottom surface of the accelerometer.

[0014] The present invention also employs an accelerometer sensor, including an accelerometer base, and an X-axis accelerometer, a Y-axis accelerometer, and an astronomical accelerometer mounted on the accelerometer base; the X-axis accelerometer, the Y-axis accelerometer, and the astronomical accelerometer are arranged orthogonally; the astronomical accelerometer is provided with a temperature regulation system for the astronomical accelerometer as described above.

[0015] According to the above scheme, the accelerometer base is provided with mounting holes corresponding to the positions of the three accelerometers. The X-axis accelerometer and the Y-axis accelerometer are both installed in the corresponding mounting holes and are respectively connected and fixed to the accelerometer base by screws. The axial accelerometer is installed in the corresponding mounting hole through a temperature equalization shell. The connecting part of the axial accelerometer, the extension part of the temperature equalization shell and the accelerometer base are fixed by screws. The heat insulation lower cover on the outside of the temperature equalization shell is fixed to the accelerometer base, and the heat insulation upper cover on the top of the axial accelerometer is fixed to the accelerometer base.

[0016] The beneficial effects of this invention are as follows: 1. The temperature regulation system designed in this invention uses a heating film to regulate the temperature of the astronomical accelerometer, so that the astronomical accelerometer is in a stable temperature field, reducing the interference of the astronomical accelerometer with changes in the external ambient temperature, thereby reducing the sensitivity of the astronomical accelerometer to the external ambient temperature and improving the performance of the astronomical accelerometer.

[0017] 2. The invention incorporates an upper and lower heat-insulating cover to further insulate the astronomical accelerometer.

[0018] 3. The present invention designs an oil seal structure that utilizes heat-conducting oil for uniform heat transfer, reducing the temperature gradient, thereby further reducing the sensitivity of the antenna thermometer to changes in the external ambient temperature and improving the performance of the equipment.

[0019] 4. The present invention designs a temperature sensor at the bottom of the accelerometer and uses the temperature sensor to adjust the heating temperature of the heating film and the temperature of the heat transfer oil, thereby realizing active temperature adjustment. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of Embodiment 1.

[0021] Figure 2 This is a schematic diagram of the overall implementation of Example 2.

[0022] Figure 3 for Figure 2 An explosion diagram.

[0023] The components include: 1. Gauge base; 2. Upward accelerometer; 3. Heat insulation pad; 4. X-axis accelerometer; 5. Y-axis accelerometer; 6. Lower heat insulation cover; 7. Upper heat insulation cover; 8. Temperature equalization shell; 9. Heating film; 10. Screws; 11. Nitrile rubber sealing rope; 12. Thermal conductive pad; 13. Temperature sensor; 14. Sealing connector; 15. Sealing gasket; 16. Sealing knob. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] In the description of the embodiments of this application, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] In the description of the embodiments of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application based on the specific circumstances.

[0027] In the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0028] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples, without contradiction. Additionally, the term "a plurality of" indicates two or more.

[0029] The sensors used in gravimeter equipment typically include an axial accelerometer, an X-axis accelerometer, and a Y-axis accelerometer. Each accelerometer has the same structure, including a body. One end of the body extends radially outward to form a connecting part. The connecting part is connected to the sensor's accelerometer base 1 by screws 10 to fix the accelerometer.

[0030] Example 1 like Figure 1 The temperature control system shown is specifically a temperature control system for an astronomical accelerometer, including a temperature equalization housing 8, a thermal pad 12, and a heating film 9; The heat-conducting pad 12 is laid on the inner bottom surface of the uniform temperature shell 8, and the heating film 9 is disposed on the outer bottom surface of the uniform temperature shell 8. The bottom surface of the astronomical accelerometer 2 is placed on the heat-conducting pad 12, and the connecting part of the astronomical accelerometer 2 is connected to the upper edge of the temperature-equalizing housing 8 by the corresponding screw 10 and the accelerometer base 1.

[0031] In this invention, the temperature-equalizing shell 8 is made of copper. The temperature-equalizing shell 8 is a cylindrical body adapted to the body of the axial accelerometer 2, with one end open and the other end closed; the heat-conducting pad 12 is disposed inside the closed end of the cylindrical body, and the heating film 9 is disposed on the outer bottom surface of the closed end of the cylindrical body; the open end of the cylindrical body extends radially outward, and the extended part is located between the connecting part of the axial accelerometer 2 and the accelerometer base 1, and the three are connected by a plurality of circumferentially arranged screws 10; a heat-insulating pad 3 is placed between the extended part of the temperature-equalizing shell 8 and the accelerometer base 1.

[0032] In this invention, the thermal pad 12 is typically made of silicone rubber as a base and then filled with aluminum oxide or boron nitride; the thermal pad 12 is a non-metallic material to avoid rigid contact with the axial accelerometer 2 and damage to the axial accelerometer 2 under vibration.

[0033] Preferably, a heat insulation lower cover 6 is provided on the lower outer side of the temperature equalization shell 8, and the upper end of the heat insulation lower cover 6 is connected to the gauge base 1.

[0034] Preferably, the temperature control system further includes an oil seal structure, which includes a heat-insulating upper cover 7. The lower end of the heat-insulating upper cover 7 is connected to the gauge base 1. The axial accelerometer 2 is located inside the heat-insulating upper cover 7. The outer top of the axial accelerometer 2 and the inner wall of the heat-insulating upper cover 7 enclose an oil cavity into which heat-conducting oil can be injected. The heat-insulating upper cover 7 has an oil injection port, which is equipped with a sealing knob 16. The sealing knob 16 is provided with a sealing gasket 15.

[0035] In this invention, a sealing connector 14 is installed on the heat insulation cover 7. The inner end of the sealing connector 14 is connected to the axial accelerometer 2 via a cable (the cable is located inside the oil cavity), and the outer end of the sealing connector 14 is connected to the signal processing module (specifically, it can be connected to the IF conversion module) via a cable. The sealing connector 14 ensures the overall sealing while supplying power to the axial accelerometer and outputting the signal detected by the axial accelerometer to an externally configured component.

[0036] In this invention, the heat-conducting oil filling the oil cavity is diphenyl ether or hydrogenated terphenyl; an oil seal structure is designed so that heat-conducting oil is added into the oil cavity through the oil injection port, and the heat-conducting oil plays a role in heat preservation for the axial accelerometer 2 inside the heat insulation cover 7.

[0037] In this invention, the upper heat insulation cover 7, the lower heat insulation cover 6, and the heat insulation pad 3 are all made of PEEK material.

[0038] Preferably, a temperature sensor 13 is provided on the bottom surface of the accelerometer 2.

[0039] In this invention, a temperature sensor 13 is used to detect the temperature at the bottom of the axial accelerometer 2, and the heating temperature of the heating film 9 is adjusted based on the temperature value. The temperature sensor 13 is a platinum resistance thermometer PT1000; the use of the heating film 9 for heating is a mature existing technology and will not be described in detail here.

[0040] Example 2 like Figure 2 and Figure 3 The image shows an acceleration sensor, specifically an acceleration sensor for a gravimeter device, including an acceleration base 1, and an X-axis accelerometer 4, a Y-axis accelerometer 5, and an axial accelerometer 2 mounted on the acceleration base 1; the X-axis accelerometer 4, the Y-axis accelerometer 5, and the axial accelerometer 2 are arranged orthogonally. The astronomical accelerometer 2 is equipped with a temperature regulation system for the astronomical accelerometer 2 as described above.

[0041] In this invention, such as Figure 2 As shown, the accelerometer base 1 is made of metal material (specifically, aviation aluminum 7075-T6 metal); the accelerometer base 1 is provided with mounting holes corresponding to the positions of the three accelerometers, wherein the X-axis accelerometer 4 and the Y-axis accelerometer 5 are both installed in the corresponding mounting holes and are respectively connected and fixed to the accelerometer base 1 by screws 10; the axial accelerometer 2 is installed in the corresponding mounting hole through the temperature equalization shell 8, and the connecting part of the axial accelerometer 2, the extension part of the temperature equalization shell 8 and the accelerometer base 1 are fixed by screws 10, the heat insulation lower cover 6 on the outside of the temperature equalization shell 8 is fixed to the accelerometer base 1 by screws 10, and the heat insulation upper cover 7 on the top of the axial accelerometer 2 is fixed to the accelerometer base 1 by screws 10.

[0042] In this invention, an upper heat-insulating cover 7 and a lower heat-insulating cover 6 are designed on the outside of the astronomical accelerometer 2. The upper heat-insulating cover 7 and the lower heat-insulating cover 6 are made of PEEK material. PEEK material has a low thermal conductivity of only 0.3 W / (m·℃) and good rigidity, which can passively insulate the astronomical accelerometer 2.

[0043] In this invention, nitrile rubber sealing ropes 11 are respectively provided at the connection positions of the upper heat insulation cover 7 and the gauge base 1, and at the connection positions of the lower heat insulation cover 6 and the gauge base 1 to play a sealing role; nitrile rubber material has excellent oil resistance, wear resistance and chemical resistance.

[0044] In this invention, a temperature sensor 13 is attached to the bottom of the accelerometer 2. The heating temperature of the heating film 9 is adjusted according to the temperature of the accelerometer 2 (by adjusting the current intensity), achieving adaptive temperature control. The heating film 9 is attached to the outer bottom surface of the temperature-equalizing housing 8, which is made of copper. Copper has good thermal conductivity, enabling it to quickly transfer the heat generated by the heating film 9 to the accelerometer 2. Furthermore, to prevent heat conduction between the metal temperature-equalizing housing 8 and the metal accelerometer base 1, a heat-insulating pad 3 is installed between them for thermal isolation. To prevent damage caused by direct rigid contact between the accelerometer 2 and the temperature-equalizing housing 8 in a vibration environment, a non-metallic heat-conducting pad 12 is used for heat transfer between the accelerometer 2 and the temperature-equalizing housing 8. The heat-conducting pad 12 effectively transfers the heat generated by the heating film 9 to the accelerometer 2, thus achieving temperature equalization.

[0045] This invention also incorporates an oil seal structure, into which heat-conducting oil (such as diphenyl ether or hydrogenated terphenyl) is injected into the oil cavity through an oil inlet. The oil cavity is completely filled with heat-conducting oil, which offers advantages such as uniform heating, excellent thermal conductivity, and good temperature stability. The thermal conductivity of the heat-conducting oil is 0.1-0.2 W / (m•K), while that of air is 0.026 W / (m•K). Therefore, the heat-conducting oil's thermal conductivity is 4-8 times that of air, enabling faster heat transfer and reducing local temperature differences. The specific heat capacity of the heat-conducting oil is 1.8-2.5 kJ / (kg•℃), while that of air is approximately 1.0 kJ / (kg•℃). The density of the heat-conducting oil is 0.82-0.95 g / cm³. 3 The density of air is 1.225 × 10⁻⁶. -3 g / cm 3For the same volume, the mass of heat transfer oil is far greater than that of air. This comparison shows that heat transfer oil has a stronger heat storage capacity. After absorbing heat, the temperature of heat transfer oil changes more slowly, which is beneficial for temperature uniformity. Due to its high thermal conductivity, heat transfer oil can quickly eliminate temperature differences through heat conduction. Although its natural convection effect is weak, its high specific heat capacity and excellent thermal conductivity effectively complement each other—heat can be evenly distributed through molecular diffusion. During steady-state operation, the temperature gradient of the heat transfer oil within the cavity is small, especially in the vertical direction, where the heat generated can be rapidly transferred upwards through heat conduction, preventing localized overheating. In contrast, air has poor thermal conductivity, and heat transfer mainly relies on natural convection. This convection method is greatly affected by the cavity structure. In a small, enclosed space, airflow is easily obstructed, making effective circulation difficult and easily leading to significant temperature differences in localized areas. Therefore, thanks to the dual advantages of high thermal conductivity and high specific heat capacity, heat transfer oil can achieve efficient and uniform thermal balance even in scenarios with weak natural convection, through the synergistic effect of dominant heat conduction and auxiliary weak convection. This characteristic is significantly better than air heat transfer that relies on convection in a confined space.

[0046] In this invention, the X-axis accelerometer 4 and the Y-axis accelerometer 5 are directly connected to the signal processing module to transmit the detected signals; the axial accelerometer 6 is connected to the signal processing module through the sealed connector 14 to transmit the detected signals.

[0047] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0048] Finally, it should be noted that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. However, any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A temperature control system for an astronomical accelerometer, characterized in that, Includes a temperature-equalizing shell, a thermal pad, and a heating film; The thermal pad is laid on the inner bottom surface of the uniform temperature shell, and the heating film is disposed on the outer bottom surface of the uniform temperature shell; The bottom of the accelerometer is placed on a thermal pad, and the upper edge of the accelerometer and the temperature equalization housing are connected to the accelerometer base.

2. The temperature control system for an astronomical accelerometer as described in claim 1, characterized in that, The temperature control system also includes an oil seal structure, which includes a heat-insulating upper cover. The lower end of the heat-insulating upper cover is connected to the gauge base. The axial accelerometer is located inside the heat-insulating upper cover. The outer top of the axial accelerometer and the inner wall of the heat-insulating upper cover form an oil cavity for injecting heat-conducting oil. The heat-insulating upper cover has an oil injection port.

3. The temperature control system for an astronomical accelerometer as described in claim 2, characterized in that, The heat insulation cover is equipped with a sealing connector, and the inner end of the sealing connector is connected to the axial accelerometer via a cable.

4. The temperature control system for an astronomical accelerometer as described in claim 3, characterized in that, The temperature equalization shell is made of copper; the temperature equalization shell is a cylinder adapted to the body of the astronomical accelerometer, with one end open and the other end closed; the heating film is located on the outer bottom surface of the closed end of the cylinder; the open end of the cylinder extends radially outward, and the extended part is located between the connection part of the astronomical accelerometer and the gauge base, and the three are connected together.

5. The temperature control system for an astronomical accelerometer as described in claim 4, characterized in that, A heat insulation lower cover is provided on the lower outer side of the temperature equalization shell, and the upper end of the heat insulation lower cover is connected to the gauge base.

6. The temperature control system for an astronomical accelerometer as described in claim 2, characterized in that, The oil filler port is equipped with a sealing knob, and the sealing knob has a sealing gasket.

7. The temperature control system for an astronomical accelerometer as described in claim 5, characterized in that, A heat insulation pad is placed between the extension of the temperature-equalizing shell and the gauge base.

8. The temperature control system for an astronomical accelerometer as described in claim 5, characterized in that, A temperature sensor is installed on the bottom surface of the accelerometer.

9. An accelerometer sensor, comprising an accelerometer base, and an X-axis accelerometer, a Y-axis accelerometer, and an axial accelerometer mounted on the accelerometer base; wherein the X-axis accelerometer, Y-axis accelerometer, and axial accelerometer are orthogonally arranged; characterized in that, The astronomical accelerometer is equipped with the temperature control system for the astronomical accelerometer as described in claim 8.

10. The acceleration sensor as described in claim 9, characterized in that, The accelerometer mount has mounting holes corresponding to the positions of the three accelerometers. The X-axis and Y-axis accelerometers are installed in their respective mounting holes and are fixed to the accelerometer mount with screws. The axial accelerometer is installed in its corresponding mounting hole through a temperature-equalizing housing. The connecting part of the axial accelerometer, the extension part of the temperature-equalizing housing, and the accelerometer mount are fixed with screws. The lower heat-insulating cover on the outside of the temperature-equalizing housing is fixed to the accelerometer mount, and the upper heat-insulating cover on the top of the axial accelerometer is fixed to the accelerometer mount.

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