A chamber method testing device with optimized performance

Abstract

This utility model relates to the field of sensor detection technology and is implemented using the following technical solution: a chamber method testing device with optimized performance, comprising a control cabinet, a refrigerator, a vacuum pump installed in the control cabinet, and a test chamber installed in the refrigerator. A connecting pipe is fixedly installed on the inner wall of the control cabinet. The bottom of the connecting pipe is connected to the test chamber via a test chamber pipe. The upper end of the connecting pipe is connected to the vacuum pump via a suction pipe. An air inlet pipe is also connected to the outside of the connecting pipe, and a pressure relief valve is installed on the outside of the air inlet pipe. A U-tube barometer and a main power indicator are also installed on the outside of the control cabinet. This utility model significantly improves the performance of the chamber method testing equipment by optimizing its design and operation process, providing a stable, reliable, and highly controllable testing environment for sensor testing.

Description

Technical Field

[0001] This utility model relates to the field of sensor detection technology, and in particular to a chamber method testing device for optimizing performance. Background Technology

[0002] In the field of chamber testing, existing technologies are mainly used for the testing and calibration of products such as sensors. Specifically, existing methods involve placing the product under test (e.g., a sensor) inside a test chamber, which is equipped with only one inlet and one outlet. The operating procedure is as follows: after introducing the test gas through the inlet for a period of time, both the inlet and outlet are simultaneously closed to stop the gas flow, thus creating a closed environment within the chamber for testing. However, this approach still has several significant drawbacks, limiting the accuracy and reliability of the test:

[0003] (1) Residual gas inside the cavity cannot be completely eliminated: Due to the reliance on only a simple ventilation and closure mechanism, a large amount of gas or environmental pollutants from the previous test remain in the cavity after it is closed, resulting in an impure test environment. This affects the accuracy of sensor calibration, especially in high-precision gas detection applications, where residual gas will introduce errors.

[0004] (2) Lack of monitoring mechanism for pressure and temperature inside the chamber: The existing solution does not integrate any pressure or temperature sensor, and cannot monitor pressure changes and temperature fluctuations inside the chamber in real time. During the test, unstable pressure may lead to uneven gas concentration, and temperature changes will affect the sensor response characteristics, and the stability of test conditions cannot be guaranteed.

[0005] (3) The cavity cannot be temperature controlled: The cavity itself does not have heating or cooling functions and only depends on the ambient temperature. This makes it impossible to conduct tests under constant temperature or specific temperature conditions, which limits the scope of application (e.g., it cannot simulate sensor performance under high or low temperature environments).

[0006] These shortcomings collectively make it difficult for existing chamber testing equipment to provide a stable and clean testing environment, affecting the repeatability and accuracy of sensor test results. Utility Model Content

[0007] To solve the above-mentioned technical problems, this utility model provides a chamber method testing device with optimized performance.

[0008] A chamber method testing device with optimized performance includes a control cabinet, a refrigerator, a vacuum pump installed in the control cabinet, and a test chamber installed in the refrigerator. A connecting pipe is fixedly installed on the inner wall of the control cabinet. The bottom of the connecting pipe is connected to the test chamber through a test chamber pipe. The upper end of the connecting pipe is connected to the vacuum pump through a suction pipe. An air inlet pipe is also connected to the outside of the connecting pipe. A pressure relief valve is installed on the outside of the air inlet pipe. A U-tube barometer and a main power indicator are also installed on the outside of the control cabinet.

[0009] As a further improvement to the above solution, a venting valve and a resistance gauge are installed on the outside of the pumping pipeline connected to the vacuum pump.

[0010] As a further improvement to the above solution, a vacuum valve, an inflation valve, and a barometer valve are provided on the outside of the connecting pipeline. The vacuum valve is used in conjunction with a vacuum pump, the inflation valve is used in conjunction with an air inlet pipeline, and the barometer valve is used in conjunction with a U-tube barometer.

[0011] As a further improvement to the above solution, the refrigerator and the test chamber are both connected to an openable upper cover by a latch, and the contact surfaces between the upper cover and the refrigerator and the test chamber are provided with sealing gaskets.

[0012] As a further improvement to the above solution, an oil filter is also installed between the air extraction pipeline and the vacuum pump.

[0013] As a further improvement to the above scheme, a pressure transmitter and a temperature and humidity detection sensor are installed at the bottom of the test chamber and connected to the inner cavity.

[0014] As a further improvement to the above solution, the test chamber is equipped with a PID temperature control module, which includes an electric heating wire disposed inside the test chamber, and a heating couple matched with the electric heating wire disposed at the bottom of the test chamber. The PID temperature control module also includes an operation panel disposed outside the control cabinet.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] (1) By introducing a vacuum mechanical pump for cyclic vacuuming and gas filling, this utility model can effectively remove residual gas inside the cavity, achieve high gas purity test conditions, avoid residual gas contamination, and thus improve the accuracy of sensor calibration.

[0017] (2) The device set up in this utility model is equipped with a vacuum gauge, a pressure transmitter, a temperature and humidity transmitter and a PID thermocouple, so as to realize real-time monitoring and precise adjustment of pressure, temperature and humidity in the chamber, and create repeatable stable conditions for sensor testing.

[0018] (3) This utility model supports a wide range of temperature control from ultra-low temperature to high temperature by using an external refrigerator and a built-in heating belt in the cavity, which solves the problem that the existing solution cannot control the temperature and expands the application scenarios of the equipment. Attached Figure Description

[0019] Figure 1 This is a diagram showing the external structure of the present invention;

[0020] Figure 2 This is a diagram showing the internal structure of this utility model;

[0021] Figure 3 This is a schematic diagram of the vacuum pump and connecting pipe structure of this utility model;

[0022] Figure 4 This is a structural diagram of the test chamber of this utility model viewed from below;

[0023] Figure 5 This is a diagram illustrating the basic principle and structure of this utility model.

[0024] Explanation of key symbols:

[0025] 1-Control cabinet, 2-Refrigerator, 3-Vacuum pump, 301-Vacuum valve, 4-Test chamber, 401-Pressure transmitter, 402-Thermocouple, 403-Temperature and humidity sensor, 5-Connecting pipe, 6-Test chamber pipe, 7-Evacuation pipe, 8-Oil filter, 9-Inlet pipe, 901-Pressure relief valve, 902-Inflation valve, 10-Break valve, 11-U-tube barometer, 1101-Barometer valve, 12-Main power indicator light, 13-PID temperature control module, 14-Resistance gauge. Detailed Implementation

[0026] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] In the description of this utility model, "multiple" means two or more, unless otherwise explicitly specified.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] Please combine Figure 1-5 A chamber method testing device for optimized use includes a control cabinet 1, a refrigerator 2, a vacuum pump 3 installed in the control cabinet 1, and a test chamber 4 installed in the refrigerator 2. A connecting pipe 5 is fixedly installed on the inner wall of the control cabinet 1. The bottom of the connecting pipe 5 is connected to the test chamber 4 via a test chamber pipe 6. The upper end of the connecting pipe 5 is connected to the vacuum pump 3 via a suction pipe 7. An air inlet pipe 9 is also connected to the outside of the connecting pipe 5. A pressure relief valve 901 is installed on the outside of the air inlet pipe 9. A U-tube barometer 11 and a main power indicator light 12 are also installed on the outside of the control cabinet 1. A venting valve 10 and a resistance gauge 14 are installed on the outside of the suction pipe 7 connected to the vacuum pump 3. The venting valve 10 can be opened manually or automatically to allow air to enter, eliminate the vacuum, and facilitate safe opening. The resistance gauge 14 can detect the vacuum degree or pressure of the pipeline, providing pressure data for monitoring and control.

[0031] The connecting pipe 5 is equipped with a vacuum valve 301, an inflation valve 902, and a barometer valve 1101. The vacuum valve 301 is used in conjunction with the vacuum pump 3, the inflation valve 902 is used in conjunction with the air inlet pipe 9, and the barometer valve 1101 is used in conjunction with the U-tube barometer 11. An oil filter 8 is also installed between the air extraction pipe 7 and the vacuum pump 3 for exhaust gas treatment. The bottom of the test chamber 4 is equipped with a pressure transmitter 401 and a temperature and humidity sensor 403 connected to the inner cavity. The test chamber 4 has a built-in PID temperature control module 13, which includes an electric heating wire installed inside the test chamber 4. A heating coupler 402 matched to the electric heating wire is installed at the bottom of the test chamber 4. The PID temperature control module 13 also includes an operation panel installed outside the control cabinet 1, which is used in conjunction with the software system to control the PID temperature control module 13.

[0032] Both the refrigerator 2 and the test chamber 4 are connected to an openable top cover by a latch, and the contact surfaces between the top cover and the refrigerator 2 and the test chamber 4 are equipped with sealing gaskets to increase the sealing effect and prevent heat loss.

[0033] Based on the above structural configuration, the workflow of this application during use is as follows: S1-S11 steps:

[0034] S1: Equipment Inspection: Check that compressed air input is connected, air source is sealed and connected, exhaust gas is connected to the exhaust system, and power supply is effectively connected.

[0035] S2: Connect to gas source: Connect the existing gas equipment to the gas inlet pipe 9.

[0036] S3: Place the product to be tested: Open the top cover of refrigerator 2 and test chamber 4, place the product to be tested and connect the test wiring harness, then close test chamber 4 and lock it tightly, and then close the top cover of refrigerator 2.

[0037] S4: Vacuuming of the cavity: The software opens the vacuum valve 301 and vacuum pump 3, and closes the venting valve 10, the filling valve 902, and the barometer valve 1101.

[0038] S5: Cavity inflation: Once the vacuum level measured by the resistance gauge 14 reaches the target pressure, the software closes the vacuum valve 301 and opens the inflation valve 902 to inflate the vacuum test chamber 4 with gas. Once the pressure inside the test chamber 4 reaches 1 atm, the above steps of vacuuming and inflation are repeated.

[0039] S6: Constant pressure measurement: After the above-mentioned cavity vacuuming and cavity inflation operations, when the air pressure in the test cavity 4 is close to 1 atm during inflation, close the inflation valve 902, and make the air pressure in the test cavity 4 exactly 1 atm after closing the inflation valve 902 (or other air pressure requirements). At this time, product calibration or testing is performed.

[0040] S7: Temperature Adjustment: If the ambient temperature needs to be adjusted, adjust the PID temperature control module 13 to heat up. Once the temperature and humidity sensor 403 detects and provides feedback that the required test temperature has been reached, the ultra-low temperature freezer can be opened if necessary.

[0041] S8: Humidity control: If atmospheric humidity needs to be controlled, the air source needs to be treated separately and monitored with temperature and humidity sensor 403.

[0042] S9: Pressure detection calibration: The pressure transmitter 401 of the pressure detection section should be calibrated during initial use and periodically. With about 1 atm of gas filled into the test chamber 4, close the vacuum valve 301 and the gas filling valve 902, open the barometer valve 1101, observe the reading of the U-tube barometer 11, and compare it with the pressure value measured by the pressure transmitter 401 for calibration.

[0043] S10: Gas filling and sample replacement: Close the barometer valve 1101, venting valve 10, and gas filling valve 902 using the software, open the vacuum valve 301, start the vacuum pump 3, and wait until the vacuum gauge reading shows a vacuum degree of about 10 Pa. Then, close the vacuum pump 3, open the venting valve 10, and wait until the gas pressure inside the cavity is equal to that of the atmosphere. Then, close the venting valve 10 and the vacuum valve 301, open the upper cover of the refrigerator 2 and the test chamber 4, and replace the product.

[0044] S11: Shutdown: When the set temperature of PID temperature control module 13 is lower than the room temperature, the heating is turned off and the software is closed.

[0045] The above embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present utility model shall be considered equivalent substitutions and shall be included within the protection scope of the present utility model.

[0046] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

Claims

1. A chamber method testing device for optimized use, comprising a control cabinet (1), a refrigerator (2), a vacuum pump (3) disposed in the control cabinet (1), and a testing chamber (4) disposed in the refrigerator (2), characterized in that: The inner wall of the control cabinet (1) is also fixedly installed with a connecting pipe (5). The bottom of the connecting pipe (5) is connected to the test chamber (4) through the test chamber pipe (6). The upper end of the connecting pipe (5) is connected to the vacuum pump (3) through the air extraction pipe (7). The outside of the connecting pipe (5) is also connected to the air inlet pipe (9). A pressure relief valve (901) is provided on the outside of the air inlet pipe (9). A U-tube barometer (11) and a main power indicator light (12) are also provided on the outside of the control cabinet (1).

2. The chamber method testing device for optimized use as described in claim 1, characterized in that, A vent valve (10) and a resistance gauge (14) are installed on the outside of the air extraction pipeline (7) connected to the vacuum pump (3).

3. The chamber method testing device for optimized use as described in claim 2, characterized in that, The connecting pipe (5) is equipped with a vacuum valve (301), an inflation valve (902) and a barometer valve (1101). The vacuum valve (301) is used in conjunction with the vacuum pump (3), the inflation valve (902) is used in conjunction with the air inlet pipe (9), and the barometer valve (1101) is used in conjunction with the U-tube barometer (11).

4. The chamber method testing device for optimized use as described in claim 2, characterized in that, The refrigerator (2) and the test chamber (4) are both connected to an openable upper cover by a latch, and the contact surfaces between the upper cover and the refrigerator (2) and the test chamber (4) are provided with sealing gaskets.

5. The chamber method testing device for optimized use as described in claim 4, characterized in that, An oil filter (8) is also installed between the air extraction pipeline (7) and the vacuum pump (3).

6. The chamber method testing device for optimized use as described in claim 4, characterized in that, The bottom of the test chamber (4) is provided with a pressure transmitter (401) and a temperature and humidity detection sensor (403) connected to the inner cavity.

7. The chamber method testing device for optimized use as described in claim 6, characterized in that, The test chamber (4) is equipped with a PID temperature control module (13). The PID temperature control module (13) includes an electric heating wire installed inside the test chamber (4), and a heating couple (402) matching the electric heating wire is installed at the bottom of the test chamber (4). The PID temperature control module (13) also includes an operation screen installed outside the control cabinet (1).

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