KR101329253B1 - Test apparatus for pressure senser - Google Patents

Abstract

The present invention relates to a pressure sensor test device where an inner space (12) is formed with heat-resistance and chill-resistance material for protecting various components installed at inside in a thermo-hygrostat. A mounting lever (18) for mounting a pressure sensor (17) is comprised at the outer surface of a housing (10). A pressure chamber (14) is formed at the inside of the housing and a pressure supplying part (16) interconnects the pressure chamber (14) and the outer part of the housing (10). The pressure sensor (17) is mounted at the pressure supplying part (16) and receives pressure provided at the pressure chamber (14). A second buffer tank (30) is installed at the inside of the housing (10) and an intake and exhaust solenoid valve (34), which is delivering the compressed air of the second buffer tank (30) to the pressure chamber (14) at once through multiple cycles, is installed at the inside of the housing (10). An air generator (24) and a first buffer tank (28) generating the compressed air are formed at the outside of the housing (10) and at the outside of the thermo-hygrostat. According to the present invention, multiple pressure sensors (17) can be tested simultaneously through multiple times, more particularly test pressure can always be uniformly maintained by properly arranging a first buffer tank (28) and a second buffer tank (30).

Description

Test apparatus for pressure sensor

The present invention relates to a pressure sensor test apparatus, and more particularly, to a pressure sensor test apparatus to be equipped with a plurality of pressure sensors at the same time to test the performance under the same pressure conditions.

The pressure sensor refers to a device and an element that detects the pressure of a liquid or gas, converts it into an electric signal that is easy to use for measurement or control, and is used in the same sense as a pressure transducer in a broad sense. Pressure sensors are one of four sensors that support process automation along with flow, liquid level and temperature sensors. The pressure range is widely used from 105 atm of artificial diamond synthesis to 10-10 Torr of mass spectrometer or electron microscope. There are many kinds of measurement principles, such as using the thermal conductivity of molecular density as well as displacement and deformation. Recently, strain gauge pressure sensors made of silicon have been developed and used for precise pressure measurement. In addition, integrated pressure sensors have been developed that make integrated circuits on the same substrate and even process signals.

One example of the use of such a pressure sensor is signal detection for airbag operation of a vehicle. That is, by detecting the pressure applied to the vehicle body, if the pressure is above a certain level, it is possible to perform the necessary measures. For example, it is to provide a signal to detect the pressure generated during the collision of the vehicle to operate the airbag.

In general, when attempting to test by actually mounting these pressure sensors on the vehicle, there is a problem that the cost for the test is increased because the pressure sensor is actually mounted on the vehicle and only one pressure sensor can be tested.

In order to solve this problem, the pressure sensor can be actually operated through a test apparatus to detect the operation accuracy of the pressure sensor. However, such a test apparatus can only perform one test at a time, and cannot perform a plurality of inspections on a single pressure sensor, which requires a lot of time to check the reliability of the pressure sensor several times. There was a problem.

Utility Model Registration of Korea 20-387723

Accordingly, an object of the present invention is to solve the conventional problems as described above, and to be able to perform a test of several cycles at a time for a plurality of pressure sensors.

According to a feature of the present invention for achieving the object as described above, the present invention is a housing that is installed in the thermo-hygrostat that is formed inside the interior space, the pressure sensor is mounted on the outer surface and provides an environment for testing the pressure sensor And, an air generator for generating compressed air for providing pressure to the pressure sensor, a buffer tank for temporarily storing the compressed air generated by the air generator, and partitioned inside the housing. And a pressure chamber providing pressure through a pressure supply port to a pressure sensor mounted on an outer surface of the housing, and an intake and exhaust solenoid valve configured to inject and discharge compressed air provided from the buffer tank into the pressure chamber. The pressure supply port is formed in plural to communicate the pressure chamber and the outside of the housing Each of these pressure supply ports is provided with a mounting lever to mount a pressure sensor.

The buffer tank is installed outside the housing to receive compressed air from the air generator to temporarily store the first buffer tank, and installed in the inner space of the housing receives the compressed air passing through the first buffer tank It includes a second buffer tank for temporary storage.

A regulator is installed between the second buffer tank and the intake and exhaust solenoid valve to maintain a constant pressure of the compressed air delivered to the intake and exhaust solenoid valve.

The second buffer tank, the intake and exhaust solenoid valve, and the regulator are installed in the inner space of the housing, and the inner wall of the inner space is made of heat and cold resistant material.

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The intake and exhaust solenoid valve performs several cycles of the intake and exhaust operation during one test operation.

A first regulator is further provided on the pipe from the air generator to transmit the compressed air from the air generator while maintaining a constant pressure.

In the pressure sensor test apparatus according to the present invention, the following effects can be obtained.

The test apparatus of the present invention is equipped with a plurality of pressure sensors in one pressure chamber to perform the test, there is an effect that can quickly test a large number of pressure sensors.

In addition, in the test apparatus of the present invention, the intake and exhaust solenoid valve is used to adjust the flow rate and the flow rate, so that various cycles of the pressure sensor of various specifications can be tested at a time to test various types of pressure sensors more quickly. There is an effect that can be done.

In addition, in the present invention, since the second buffer tank is placed in the housing partitioned from the outside and the environment, and the first buffer tank is placed outside the housing to be connected to the second buffer tank, the pressure in the pressure chamber can be set more accurately. This has the effect of providing a pressure that can be used to continuously test multiple cycles at once. In other words, it is possible to make the environment under which the pressure sensor is tested to a desired specification, thereby enabling more reliable testing.

1 is a schematic configuration diagram showing a configuration of a preferred embodiment of the pressure sensor test apparatus according to the present invention.
Figure 2 is a front view showing a state in which a plurality of pressure sensors are mounted on the housing of the embodiment shown in FIG.
Figure 3 is a block diagram showing the configuration of an embodiment of the present invention.

Hereinafter, a configuration of a preferred embodiment of a pressure sensor test apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

As shown in the figures, the housing 10 forms the appearance of the main part of the test apparatus of the present invention. The housing 10 has a predetermined internal space 12 formed therein. The housing 10 is designed to have a substantially hexahedral shape in this embodiment, but it is not necessary to do so.

The inner wall of the inner space 12 was insulated. That is, the inner wall is made of heat and cold resistant materials, and the inner space 12 may satisfy the temperature condition of 40 degrees below zero to 85 degrees, which is a requirement of the sensor performance test. That is, the inner space 12 of the housing 10 is designed to withstand the environment of the various components therein even if the housing 10 is installed in the space for the performance test of the pressure sensor 17. The housing 10 is installed in the thermo-hygrostat during the actual test. Thus, the pressure sensor 17, which will be described below, which is mounted outside of the housing 10, is exposed in an environment made for testing.

One side of the inner space 12 is separately partitioned to form a pressure chamber 14. The pressure chamber 14 is partitioned from the internal space 12 so that the air pressure is set to test the pressure sensor 17. A pressure supply port 16 is formed to communicate the pressure chamber 14 with the outside of the housing 10. The pressure supply port 16 is opened to the outside of the housing 10 to apply pressure to the pressure sensor 17 mounted on the outside of the housing 10. Packing (not shown) is placed on the outlet side of the pressure supply port 16, that is, on the outer surface side of the housing 10 so that the air pressure does not leak when the pressure sensor 17 is mounted. The pressure supply port 16 is formed in plural, the number of which is related to the volume of the pressure chamber 14.

A plurality of mounting levers 18 are installed on the outer surface of the housing 10. The mounting lever 18 allows the pressure sensor 17 to be mounted to correspond to the pressure supply port 16 of the housing 10. The mounting lever 18 is provided with a handle 20 to allow an operator to operate the mounting lever 18. The mounting lever 18 is also provided with a push bar 22. The push bar 22 is to mount the pressure sensor 17 in close contact with the outer surface of the housing 10. The force pushed by the push bar 22 may be given by a torsion spring (not shown) installed at the center of rotation of the mounting lever 18, for example.

 Here, the configuration in which the push bar 22 presses the pressure sensor 17 is not the gist of the present invention, and thus is not illustrated or described in detail. For example, the push bar 22 is provided in the push bar 22. When the fixing nut 23 is operated, the fixing bar 23 ′ linearly moves to fasten the pressure sensor 17 to the mounting lever 18, and the push bar 22 presses the pressure sensor 17. The pressure sensor 17 is in close contact with and fixed to the housing 10 by pressure. Of course, the configuration of the mounting lever 18 may have a variety of forms in addition to those described above.

On the other hand, an air generator 24 for supplying compressed air to the pressure chamber 14 is provided. The air generator 24 is provided separately from the housing 10. The air generator 24 compresses and provides air. The first regulator 26 is installed on the pipe 25 through which the compressed air from the air generator 24 flows. The first regulator 26 serves to adjust the pressure of the air from the air generator 24 to a predetermined value. Of course, the first regulator 26 is not necessarily installed. However, it is preferable to use the first regulator 26 in order to supply air of a constant pressure to the first buffer tank 28 below.

Air passing through the first regulator 26 is filled in the first buffer tank (28). The first buffer tank 28 is a place where the compressed air temporarily stays. The first buffer tank 28 is also provided outside the housing 10.

The second buffer tank 30 is provided in the inner space 12 of the housing 10. The second buffer tank 30 is a part in which the air from the first buffer tank 28 is temporarily stored, and the test device has a long distance from the first buffer tank 28 to the pressure chamber 14. This is to prevent the pressure in the pressure chamber 14 from being maintained properly during the operation. In particular, the second buffer tank 30 is located in the inner space 12 can be kept to a minimum distance to the pressure chamber (14). As such, by placing the second buffer tank 30 in the inner space 12, the pressure in the pressure chamber 14 does not drop below a predetermined value even in a continuous test.

For reference, storing and storing the compressed air made by the air generator 24 in the first and second buffer tanks 28 and 30 form an internal space 12 separately partitioned by the housing 10 and pressure. This is to allow various test environments of the sensor 17 to be set. That is, the pressure of the compressed air supplied to the pressure chamber 14 is kept constant by placing the second buffer tank 30 in the inner space 12. If the second buffer tank 30 is not in the inner space 12, the supply source for supplying the compressed air to the pressure chamber 14 is far from providing the air of the predetermined pressure.

And, even if the distance from the air generator 24 to the second buffer tank 30 is short, to put the first buffer tank 28, the pressure chamber 14 in the second buffer tank (30) The supply of compressed air to the furnace is facilitated. This is because the test is performed in a state where the air generator 24 is operated to fill the air so that the inside of the first and second buffer tanks 28 and 30 becomes a predetermined pressure. However, since the housing 10 is actually installed in the thermo-hygrostat and the air generator 24 and the like should be installed outside the thermo-hygrostat, the air generator 24 and the first buffer tank 28 and the housing 10 ), That is, the distance to the second buffer tank 30 is bound to have a predetermined value or more.

The second regulator 32 is provided on a path through which the air compressed from the second buffer tank 30 to the pressure chamber 14 moves. The second regulator 32 serves to maintain a constant pressure of air supplied from the second buffer tank 30 to the pressure chamber 14.

An intake and exhaust solenoid valve 34 is provided to control the air supplied from the second buffer tank 30 to the pressure chamber 14 and the air discharged from the second buffer tank 30. The intake and exhaust solenoid valve 34 controls the supply and discharge of continuously compressed air into the pressure chamber 14 over a short time. In this way, a predetermined pressure is continuously applied to the pressure sensor 17 through the pressure supply port 16, so that a plurality of pressure sensors 17 can be tested over several cycles at one time. In addition, the intake and exhaust solenoid valve 34 may test the pressure sensor 17 under various conditions by adjusting the flow rate and flow rate by adjusting the opening and closing time.

Hereinafter, the pressure sensor test apparatus according to the present invention having the configuration as described above will be described in detail.

First, each pressure supply port 16 of the housing 10 is equipped with a pressure sensor 17, respectively. The pressure sensor 17 is mounted to the housing 10 using the mounting lever 18 described above. That is, in a state in which the handle 20 of the mounting lever 18 is rotated in the vertical direction, the pressure sensor 17 is positioned in the pressure supply port 16, and the handle 20 is rotated again to rotate in the horizontal direction. To be At this time, the pressure sensor 17 is fixed to the mounting lever 18 by operating the fixing nut 23 of the mounting lever 18, and the pressure sensor 17 is housed by the push bar 22. To be pressed against the outer surface of (10).

In this manner, after mounting the pressure sensors 17 to be tested, the air generator 24 is operated. The air compressed by the air generator 24 is passed through the first regulator 26 and filled in the first buffer tank 28 and the second buffer tank 30. After the first and second buffer tanks 28 and 30 are made to a predetermined pressure by the operation of the air generator 24, the air generator 24 stops operating.

Next, while the intake and exhaust solenoid valve 34 is operated, the air of the second buffer tank 30 is sent to the pressure chamber 14. At this time, the intake and exhaust solenoid valve 34 operates several cycles in one test. For example, the intake / exhaust operation is performed once per second, so that a total of five cycles can be performed. In this case, the pressure sensor 17 may be tested while the pressure is applied to the pressure chamber 14 five times.

Through such a test, it is possible to check whether the pressure sensor 17 is operated. If the flow rate and flow rate are adjusted by adjusting the opening and closing time of the intake and exhaust solenoid valve 34, the operation of the pressure sensor 17 is tested under various conditions. You can do it.

On the other hand, after performing the test five times in one test, for example, five cycles, in order to perform the test, the pressures of the first and second buffer tanks 28 and 30 must be made again to a predetermined value. To this end, the air generator 24 is operated again. Then, the test is performed while repeatedly performing the above-described operation.

The scope of the present invention is not limited to the embodiments described above, but may be defined by the scope of the claims, and those skilled in the art may make various modifications and alterations within the scope of the claims It is self-evident.

For example, in the illustrated embodiment, it is assumed that the air generator 24 and the first buffer tank 28 are separately located outside the housing 10. However, in some cases, the air generator 24 may be installed in the inner space of the housing 10. In this case, since the distance from the air generator 24 to the second buffer tank 30 can be made short, the first buffer tank 28 may not be used separately. However, since the intake and exhaust solenoid valve 34 is operated five cycles while the operation of the air generator 24 is stopped, the first buffer tank 28 is not used while increasing the capacity of the second buffer tank 30. Or, both the first buffer tank 28 and the second buffer tank 30 should be used.

In the description of the present embodiment, the intake and exhaust solenoid valve 34 performs five cycles of test in one operation, but the number of cycles performed in one operation may be various.

10: housing 12: inner space
14: Pressure chamber 16: Pressure supply port
17: Pressure sensor 18: Mounting lever
20: handle 22: push bar
24: air generator 25: piping
26: first regulator 28: first buffer tank
30: second buffer tank 32: second regulator
34: Intake and exhaust solenoid valve

Claims (7)

A housing installed inside the thermo-hygrostat, the inner space being formed inside and the pressure sensor mounted on the outer surface and providing an environment for testing the pressure sensor;
An air generator for generating compressed air to provide pressure to the pressure sensor;
A buffer tank for temporarily storing the compressed air generated by the air generator,
A pressure chamber formed by partitioning inside the housing and providing pressure through a pressure supply port to a pressure sensor mounted on an outer surface of the housing;
And an intake and exhaust solenoid valve configured to inject and discharge the compressed air provided by the buffer tank into the pressure chamber.
And a plurality of pressure supply holes are formed to communicate the pressure chamber with the outside of the housing, and a mounting lever is provided to mount a pressure sensor on each of the pressure supply holes.
The buffer tank of claim 1, wherein the buffer tank is installed outside the housing to temporarily receive compressed air from the air generator, and temporarily stores the first buffer tank, and is installed in an inner space of the housing to store the first buffer tank. Pressure sensor test apparatus including a second buffer tank for temporarily receiving the compressed air passing through.

The pressure sensor test apparatus of claim 2, wherein a regulator is provided between the second buffer tank and the intake and exhaust solenoid valve to maintain a constant pressure of the compressed air delivered to the intake and exhaust solenoid valve.
The pressure sensor test apparatus of claim 3, wherein the second buffer tank, the intake and exhaust solenoid valve, and the regulator are installed in an inner space of the housing, and an inner wall of the inner space is made of a heat and cold resistant material.
delete The pressure sensor test apparatus according to any one of claims 1 to 4, wherein the intake and exhaust solenoid valve performs several cycles of the intake and exhaust operation during one test operation.
The pressure sensor test apparatus of claim 6, wherein the pipe from the air generator is further provided with a first regulator to maintain and maintain a constant pressure of the compressed air from the air generator.

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