Test box suitable for atmospheric static pressure sensor

Abstract

The utility model discloses a test box suitable for an atmospheric static pressure sensor, belongs to the field of testing of atmospheric static pressure sensors, and aims to solve the technical problems that in the prior art, testing operation of the atmospheric static pressure sensor is tedious, and airtightness is difficult to guarantee. The device comprises a box body, a test cavity is formed in the box body, a sensor placing support is arranged in the test cavity, and a plurality of sensors to be tested are arranged on the sensor placing support; the box body is respectively provided with a gas path interface and an electrical connector; the plurality of to-be-tested sensors are electrically connected with the electrical connector respectively; and the gas circuit interface is connected with pressure control equipment. The test box suitable for the atmospheric static pressure sensor is convenient to operate, can better simulate the actual working state of the atmospheric static pressure sensor, and can more accurately test and obtain the characteristics of the sensor.

Description

Technical Field

[0001] The utility model relates to the field of atmospheric static pressure sensor testing, and particularly relates to a testing box suitable for an atmospheric static pressure sensor. Background Technique

[0002] An atmospheric static pressure sensor is a high-precision pressure sensor used for measuring atmospheric static pressure in fields such as aerospace, and the accuracy level is usually not lower than 0.02 level. During the production process, it is necessary to test the output value of the atmospheric static pressure sensor within the working pressure and working temperature ranges, and calculate key performance indicators such as the accuracy, hysteresis, and repeatability of the sensor.

[0003] The existing testing method for an atmospheric static pressure sensor is as follows: A sensor mounting fixture is arranged in a high and low temperature chamber. The mounting fixture has air circuit interfaces and mechanical interfaces that match the measured atmospheric static pressure sensor. The air circuit interfaces are connected to a pressure control device outside the high and low temperature chamber through pipelines. The high and low temperature chamber simulates the working environmental temperature of the sensor, and the pressure control device simulates the working pressure of the sensor.

[0004] Problems existing in the existing testing of atmospheric static pressure sensors are as follows: First, the sensor needs to be installed on the sensor mounting fixture by using a sealing ring and multiple screws, etc. It is also necessary to check whether the sealing ring is damaged before installation, and the tightening torque of the screws needs to be controlled during the installation process, and the operation is cumbersome; Second, there is a sealing position for each sensor installation. If any one sensor leaks, the pressure in the air circuit will be unstable, affecting the actual input pressure of all sensors, and all sealing positions need to ensure sealing simultaneously. Therefore, the number of sensors that can be measured simultaneously is limited, and the more the number, the more difficult it is to ensure airtightness; Third, in actual use, the measured pressure of the atmospheric static pressure sensor is the same as the surrounding environmental pressure. The existing testing system can only apply the measured pressure to the air circuit of the sensor, and the external environmental pressure of the static pressure sensor is the pressure of the measurement site, and it cannot fully simulate the real application state of the static pressure sensor. Content of the Utility Model

[0005] The purpose of the utility model is to provide a testing box suitable for an atmospheric static pressure sensor, so as to solve the technical problems of cumbersome operation and difficult airtightness guarantee in the existing testing of atmospheric static pressure sensors.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A testing box suitable for an atmospheric static pressure sensor provided by the utility model is characterized in that it includes a box body, a testing cavity is formed in the box body, a sensor placement bracket is arranged in the testing cavity, and a plurality of sensors to be tested are arranged on the sensor placement bracket;

[0008] An air circuit interface and an electrical connector are respectively arranged on the box body; a plurality of sensors to be tested are respectively electrically connected to the electrical connector; the air circuit interface is connected with a pressure control device.

[0009] In the utility model, by arranging a plurality of static pressure sensors to be tested in the same sealed test cavity, the risk of air leakage during the test is greatly reduced, and it is not limited by the number of sensors tested simultaneously.

[0010] Optionally or preferably, a temperature sensor is arranged at the center of the sensor placement bracket; a plurality of sensors to be tested are arranged around the temperature sensor.

[0011] Optionally or preferably, a plurality of fixing holes are formed in the sensor placement bracket, and the temperature sensor and the plurality of sensors to be tested are respectively arranged in the plurality of fixing holes.

[0012] By embedding the temperature sensor and the sensors to be tested in the fixing holes, the heat exchange area between the sensor placement bracket and the temperature sensor and the plurality of sensors to be tested is increased, thereby shortening the time for the temperature sensor and the plurality of sensors to be tested to reach the predetermined temperature.

[0013] Optionally or preferably, heat-conducting silicone rubber is potted between the temperature sensor and the fixing hole.

[0014] Optionally or preferably, a cavity door is hinged on the box body; sealing grooves are arranged on both the cavity door and the box body, and a sealing structure is arranged in the sealing grooves.

[0015] Optionally or preferably, the electrical connector is a multi-pin airtight socket.

[0016] Based on the above technical solutions, the utility model can at least produce the following technical effects:

[0017] A test box applicable to an atmospheric static pressure sensor provided by the utility model realizes the measurement of a plurality of sensors simultaneously by means of vacuum pressurization in the test cavity, and only one position, namely the cavity door, needs to be sealed in the whole test box.

[0018] Compared with the prior art in which each sensor has a sealing position, and the more sensors are tested simultaneously, the greater the risk of air leakage, the utility model can greatly reduce the risk of air leakage during the test and is not limited by the number of sensors tested simultaneously.

[0019] At the same time, for the utility model, the sensors to be tested only need to be placed on the sensor mounting bracket, and there is no need to tightly install the air circuit interface, so the operation is more convenient.

[0020] Meanwhile, by pressurizing the inside of the box, the actual working state of the atmospheric static pressure sensor can be better simulated, and the characteristics of the sensor can be more accurately measured and obtained. Description of the Drawings

[0021] Figure 1 is a schematic diagram of the overall structure of the test box applicable to the atmospheric static pressure sensor of the present utility model Figure 1 ;

[0022] Figure 2 is a schematic diagram of the overall structure of the test box applicable to the atmospheric static pressure sensor of the present utility model Figure 2 .

[0023] In the figure: 1, box body; 2, test cavity; 3, gas path interface; 4, sensor to be tested; 5, sensor placement bracket; 6, electrical connector; 7, temperature sensor; 8, cavity door. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0025] Embodiment

[0026] Please refer to Figure 1 and Figure 2 , a test box applicable to an atmospheric static pressure sensor, including a box body 1 and a cavity door 8 hinged to the box body 1. The box body 1 and the cavity door 8 together form a sealed test environment inside the box body 1, that is, the test cavity 2.

[0027] In order to improve the test performance of the cavity door 8, in this embodiment, sealing grooves are provided on both the cavity door 8 and the box body 1, and a sealing structure is provided in the sealing grooves. The sealing structure can be a sealing ring, so that when the cavity door 8 and the gas path interface 3 are in the closed state, the leak rate inside the test cavity 2 is less than 10 -9 Pa·m 3 / s.

[0028] In this embodiment, a sensor placement bracket 5 is provided inside the test cavity 2. Multiple fixing holes are provided on the sensor placement bracket 5, and a temperature sensor 7 and multiple sensors to be tested 4 are respectively fixed in the multiple fixing holes; it should be noted that the temperature sensor 7 should be set at the center position of the sensor placement bracket 5, and the multiple sensors to be tested 4 are arranged in a rectangular array or a circular array with the temperature sensor 7 as the center.

[0029] By arranging the temperature sensor 7 and multiple sensors 4 to be measured in the fixing holes of the sensor placement bracket 5, the time for the sensors to reach temperature stability after temperature change is shortened; in addition, in order to further shorten the time for the sensors to reach temperature stability after temperature change, in this embodiment, the sensor placement bracket 5 is made of a high thermal conductivity material, and thermal conductive silicone rubber is potted between the temperature sensor 7 and the fixing holes.

[0030] In this embodiment, an electrical connector 6 is fixedly connected to the upper end face of the box body 1. The above-mentioned multiple sensors 4 to be measured and the temperature sensor 7 are respectively electrically connected to the electrical sensor 6, and the electrical sensor 6 is used to supply power to the above-mentioned multiple sensors 4 to be measured and the temperature sensor 7 and connect to a signal acquisition device.

[0031] An air path interface 3 is provided on one side of the box body 1. The air path interface 3 is connected to an external pressure control device and is used for testing the pressure control in the cavity 2.

[0032] A test box applicable to an atmospheric static pressure sensor provided by this embodiment has the following specific test method:

[0033] Place the box body 1 of the atmospheric static pressure sensor test box in a high and low temperature box, place multiple sensors 4 to be measured on the sensor placement bracket 5 (it can be understood that in this embodiment, the sensors 4 to be measured are atmospheric static pressure sensors), respectively connect the electrical signal lines of the sensors 4 to be measured and the power supply and signal acquisition device lines of the sensors to the pins on the inner and outer sides of the electrical connector 6 in the vacuum cavity, and connect the pressure control device to the air path interface 3 on the test cavity 2.

[0034] During the test, close the vacuum cavity door 8 and pressurize to the upper limit value of the static pressure sensor measurement pressure; then set the high and low temperature box to the required temperature value, and perform a pressure test after the temperature value measured by the temperature sensor 7 reaches the required temperature value; after the pressure changes, it is necessary to wait until the temperature value measured by the temperature sensor 7 reaches stability again before performing the test.

[0035] Compared with the prior art, the beneficial effects of the present utility model are as follows: The method of pressurizing inside the vacuum cavity is adopted to realize the measurement of multiple sensors simultaneously, and only the cavity door of the entire test box is a position that needs to be sealed. In the original test, each sensor has a sealing position, and the more sensors are tested simultaneously, the greater the risk of air leakage. The present invention can greatly reduce the risk of air leakage during the test and is not limited by the number of sensors tested simultaneously.

[0036] At the same time, in the present invention, the sensors only need to be placed on the sensor mounting bracket 5, and there is no need to perform the fastening installation of the air path interface, and the operation is more convenient. At the same time, by adopting the method of pressurizing inside the box body 1, the actual working state of the atmospheric static pressure sensor can be better simulated, and the characteristics of the sensor can be measured more accurately.

[0037] Although embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the appended claims and their equivalents.

Claims

1. A test box applicable to an atmospheric static pressure sensor, characterized in that, It includes a box body (1), a test cavity (2) is formed inside the box body (1), a sensor placement bracket (5) is arranged inside the test cavity (2), and a plurality of sensors to be tested (4) are arranged on the sensor placement bracket (5); An air circuit interface (3) and an electrical connector (6) are respectively arranged on the box body (1); the plurality of sensors to be tested (4) are respectively electrically connected to the electrical connector (6); the air circuit interface (3) is connected to a pressure control device.

2. The test chamber applicable to an air static pressure sensor according to claim 1, characterized in that, A temperature sensor (7) is arranged at the center of the sensor placement bracket (5); the plurality of sensors to be tested (4) are arranged around the temperature sensor (7).

3. The test chamber applicable to an air static pressure sensor according to claim 2, wherein, A plurality of fixing holes are formed in the sensor placement bracket (5), and the temperature sensor (7) and the plurality of sensors to be tested (4) are respectively arranged in the plurality of fixing holes.

4. The test chamber applicable to an air static pressure sensor according to claim 3, characterized in that, Thermal conductive silicone rubber is potted between the temperature sensor (7) and the fixing hole.

5. The test chamber applicable to an air static pressure sensor according to claim 1, characterized in that, A cavity door (8) is hinged on the box body (1); sealing grooves are arranged on both the cavity door (8) and the box body (1), and a sealing structure is arranged in the sealing grooves.

6. The test chamber applicable to an air static pressure sensor according to claim 1, characterized in that, The electrical connector (6) is a multi-pin airtight socket.

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