Testing device for detecting gas mixing degree of environmental chamber

Abstract

The utility model belongs to the field of mixing degree detection, particularly relates to a testing device for detecting the mixing degree of gas in an environmental chamber, and aims to solve the problem that the mixing degree cannot be accurately and reliably measured in the prior art. A compressed air storage bin is connected and communicated with one end of a compressed air pretreatment device in a sealed mode and connected with at least two air pipelines after pressure reduction, each air pipeline is provided with an air mass flow controller and an electromagnetic valve, and the air mass flow controllers and the electromagnetic valves are converged to serve as a first pipeline. The CO2 storage bin is connected with at least two CO2 pipelines after pressure reduction, each CO2 pipeline is provided with a CO2 mass flow controller and an electromagnetic valve, and the CO2 mass flow controllers and the electromagnetic valves are converged to serve as a second pipeline; the first pipeline and the second pipeline are communicated with each other and then are connected to the test bin, and CO2 sensors are respectively connected to an air inlet and an air outlet of the test bin; the solenoid valve is remotely controlled by a controller based on a set flow rate. According to the utility model, the gas flow adjustment is more flexible and automatic, and the working efficiency and the measurement accuracy are improved.

Description

Technical Field

[0001] The utility model belongs to the field of mixing degree detection, and in particular relates to a test device for detecting the mixing degree of gases in an environmental chamber. Background Art

[0002] In modern industrial production and laboratory applications, the supply and control of compressed air and compressed carbon dioxide play a vital role. Whether as a power source, process medium or experimental condition setting, precise control of gas flow is essential.

[0003] For compressed air systems, since they are widely used in mechanical drives, surface cleaning, pneumatic tool operations, and automatic control components in many production processes, the gas volume requirements for different application scenarios vary greatly. In existing technologies, the gas volume control of compressed air and carbon dioxide mainly relies on manual adjustment or simple automatic control. Manual adjustment makes it difficult to accurately control the gas volume, and simple automatic control cannot be flexibly adjusted according to actual needs; especially when multiple chambers are selected and test chambers of different volumes correspond to different flow requirements, the existing technical solutions cannot achieve flexible and accurate gas volume control.

[0004] Based on this, the utility model proposes a test device for detecting the mixing degree of gases in an environmental chamber. Utility Model Content

[0005] In order to solve the above-mentioned problem in the prior art, that is, when multiple chambers are selected and test chambers of different volumes correspond to different flow requirements, the prior art solution cannot achieve flexible and accurate gas volume control, the utility model provides a test device for detecting the gas mixing degree of an environmental chamber, including a compressed air storage chamber, a CO2 storage chamber, a compressed air pretreatment device, an air mass flow controller, a CO2 mass flow controller and a test chamber;

[0006] The compressed air storage bin is sealed and connected to one end of the compressed air pretreatment device and communicates with each other. The compressed air is decompressed after passing through the compressed air pretreatment device and is sealed and connected to at least two air pipelines. An air mass flow controller and a solenoid valve are provided on each of the air pipelines. After passing through the air mass flow controller, each of the air pipelines converges into a first pipeline.

[0007] After the CO2 storage warehouse is depressurized, it is sealed and connected to at least two CO2 pipelines, each of which is provided with a CO2 mass flow controller and a solenoid valve, and each of the CO2 pipelines is combined into a second pipeline after passing through the CO2 mass flow controller;

[0008] The first pipeline and the second pipeline are connected to a test chamber, and CO2 sensors are respectively connected to the air inlet and the air outlet of the test chamber to detect the concentration of CO2.

[0009] In some preferred embodiments, the compressed air pretreatment device comprises at least an oil removal filter, a water removal filter and a molecular membrane dryer;

[0010] One end of the compressed air storage bin is sealed and connected to one end of the oil removal filter, the other end of the oil removal filter is sealed and connected to one end of the water removal filter, the other end of the water removal filter is sealed and connected to one end of the molecular membrane dryer, and the other end of the molecular membrane dryer is sealed and connected to at least two air pipes after decompression;

[0011] The solenoid valve is remotely controlled by a controller based on a set flow rate.

[0012] In some preferred embodiments, the other end of the molecular membrane dryer is sealed and connected to at least two air ducts after decompression, and the specific means are:

[0013] The other end of the molecular membrane dryer is sealed and connected to one end of the first pressure reducing valve and communicated therewith. The other end of the first pressure reducing valve is sealed and connected to at least two air pipelines respectively and communicated therewith.

[0014] In some preferred embodiments, the CO2 storage bin is sealed and connected to at least two CO2 pipelines after decompression, and the specific means are:

[0015] The CO2 storage bin is sealed and connected to one end of the second pressure reducing valve and communicated therewith, and the other end of the second pressure reducing valve is sealed and connected to at least two CO2 pipelines respectively and communicated therewith.

[0016] In some preferred embodiments, the air mass flow controllers respectively arranged on each of the air ducts allow different flows of compressed air to pass through.

[0017] In some preferred embodiments, the CO2 mass flow controllers respectively provided on each of the CO2 pipelines allow different flow rates of CO2 to pass through.

[0018] In some preferred embodiments, the solenoid valve is electrically connected to a controller, and the controller is used to remotely control the opening and closing of the solenoid valve, the flow rate setting, and the reading of the actual flow rate. In some preferred embodiments, the controller includes a PLC controller.

[0019] In some preferred embodiments, the controller is also electrically connected to the CO2 sensor to obtain data detected by the CO2 sensor and calculate the CO2 mixing degree.

[0020] In some preferred embodiments, the sealed connection and communication includes sealed connection and communication through a pipeline.

[0021] Beneficial effects of the utility model:

[0022] The utility model can realize accurate gas volume control according to different gas bin volumes and set flow rates, and control the opening and closing of the solenoid valve and flow rate setting through PLC, making the adjustment of gas volume more flexible and automatic. At the same time, by testing the gas concentration through the carbon dioxide sensor, the carbon dioxide mixing degree can be accurately calculated, which is conducive to realizing more accurate environmental control. In addition, all data can be monitored and measured in real time through computer configuration software, which improves work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0024] Figure 1 The utility model is a structural connection diagram of a test device for detecting the gas mixing degree in an environmental chamber. DETAILED DESCRIPTION

[0025] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant utility model, rather than to limit the utility model. It is also necessary to explain that, for ease of description, only the parts related to the relevant utility model are shown in the accompanying drawings.

[0026] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0027] like Figure 1 As shown, the utility model provides a test device for detecting the gas mixing degree of an environmental chamber, comprising a compressed air storage chamber 1, a CO2 storage chamber 2, a compressed air pretreatment device 3, an air mass flow controller 4, a CO2 mass flow controller 5 and a test chamber 6;

[0028] The compressed air storage bin 1 is sealed and connected to one end of the compressed air pretreatment device 3, and the compressed air is decompressed after passing through the compressed air pretreatment device 3, and is sealed and connected to at least two air pipelines, each of which is provided with an air mass flow controller 4 and a solenoid valve, and each of the air pipelines is merged into a first pipeline 7 after passing through the air mass flow controller 4;

[0029] The CO2 storage warehouse 2 is sealed and connected to at least two CO2 pipelines after decompression, and each CO2 pipeline is provided with a CO2 mass flow controller 5 and a solenoid valve, and each CO2 pipeline is combined into a second pipeline 8 after passing through the CO2 mass flow controller 5;

[0030] The first pipe 7 and the second pipe 8 are connected to the test chamber 6, and the air inlet and exhaust of the test chamber 6 are respectively connected with a CO2 sensor 61 for detecting the concentration of CO2;

[0031] The solenoid valve is remotely controlled by a controller based on a set flow rate.

[0032] Among them, in this embodiment, "an air mass flow controller 4 and a solenoid valve are respectively provided on each of the air pipes", which specifically means:

[0033] The air mass flow controller 4 includes a first air mass flow controller 41 and a second air mass flow controller 42, wherein the first air mass flow controller 41 and the second air mass flow controller 42 are respectively arranged on two pipelines, a first solenoid valve is installed on the side of the pipeline where the first air mass flow controller 41 is located close to the compressed air storage bin 1, and a second solenoid valve is installed on the side of the pipeline where the second air mass flow controller 42 is located close to the compressed air storage bin 1;

[0034] The two pipelines connected to the outlets of the first air mass flow controller 41 and the second air mass flow controller 42 are connected and merged to form a first pipeline 7 .

[0035] Specifically in the application process, compressed air volume control includes:

[0036] 3m 3 、10m 3 、30m 3 、81m 3The gas volume in the warehouse is 0.5 times / hour, and the corresponding flow rates are 25L / min, 83.3L / min, 250L / min, and 675L / min respectively. The air mass flow controller 4 for compressed air uses 200L / min and 500L / min. When the flow rate is set less than 190L / min, only the 200L / min flow meter is used to open the first solenoid valve; when the flow rate is set in the range of 190L / min to 490L / min, only the 500L / min flow meter is used to open the second solenoid valve; when the flow rate is set greater than 490L / min, both 200L / min and 500L / min flow meters are used at the same time to open the first and second solenoid valves (the 200L / min flow meter is directly set to 190L / min, and the 500L / min flow meter is set to the total flow -190L / min).

[0037] Among them, in this embodiment, "a CO2 mass flow controller 5 and a solenoid valve are respectively provided on each of the CO2 pipelines", specifically:

[0038] The CO2 mass flow controller 5 includes a first CO2 mass flow controller 51 and a second CO2 mass flow controller 52, wherein the first CO2 mass flow controller 51 and the second CO2 mass flow controller 52 are respectively arranged on two pipelines, a third solenoid valve is installed on the side of the pipeline where the first CO2 mass flow controller is located close to the CO2 storage bin 2, and a fourth solenoid valve is installed on the side of the pipeline where the second CO2 mass flow controller 52 is located close to the CO2 storage bin 2;

[0039] The two pipelines connecting the outlets of the first CO 2 mass flow controller 51 and the second CO 2 mass flow controller 52 are connected and merged to form the second pipeline 8 .

[0040] Specifically in the application process, CO2 gas volume control includes:

[0041] 3m 3 、10m 3 、30m 3 、81m 3 Storage concentration (3000±1000)mg / m 3, CO2 standard density is 1.997g / L, volume concentration is (1500±500)ppm, corresponding flow rates are (37.5±12.5)mL / min, (125±41.67)mL / min, (375±125)mL / min, (1012.5±337.5)mL / min. 200mL / min (first CO2 mass flow controller 51) and 2000mL / min (second CO2 mass flow controller 52), when the flow setting is less than or equal to 190mL / min, only the first CO2 mass flow controller 51 is used to open the third solenoid valve; when the flow setting is greater than 190mL / min, only the second CO2 mass flow controller 52 is used to open the fourth solenoid valve; the flow can be set manually, or the corresponding flow of different volume bins can be set in the configuration, and then the corresponding volume of the bin is selected to directly call the set flow.

[0042] As a further explanation of the present utility model, the compressed air pretreatment device 3 at least includes an oil removal filter 31, a water removal filter 32 and a molecular membrane dryer 33;

[0043] One end of the compressed air storage tank 1 is sealed and connected to one end of the oil removal filter 31, the other end of the oil removal filter 31 is sealed and connected to one end of the water removal filter 32, the other end of the water removal filter 32 is sealed and connected to one end of the molecular membrane dryer 33, and the other end of the molecular membrane dryer 33 is sealed and connected to at least two air ducts after decompression.

[0044] As a further explanation of the present invention, the other end of the molecular membrane dryer 33 is sealed and connected to at least two air pipes after decompression, and the specific means are:

[0045] The other end of the molecular membrane dryer 33 is sealed and connected to one end of the first pressure reducing valve 34 and communicated therewith. The other end of the first pressure reducing valve 34 is sealed and connected to at least two air pipelines respectively and communicated therewith.

[0046] As a further explanation of the present invention, the CO2 storage bin 2 is sealed and connected to at least two CO2 pipelines after decompression, and the specific means are:

[0047] The CO2 storage bin 2 is sealed and connected to one end of the second pressure reducing valve 35 and communicated therewith. The other end of the second pressure reducing valve 35 is sealed and connected to at least two CO2 pipelines respectively and communicated therewith.

[0048] As a further explanation of the present invention, the air mass flow controller 4 respectively arranged on each of the air ducts allows different flow rates of compressed air to pass through.

[0049] As a further explanation of the present invention, the CO2 mass flow controller 5 respectively arranged on each of the CO2 pipelines allows different flow rates of CO2 to pass through.

[0050] As a further explanation of the present invention, the solenoid valve is electrically connected to a controller, and the controller is used to remotely control the opening and closing of the solenoid valve, the flow rate setting, and the reading of the actual flow rate.

[0051] As a further explanation of the present invention, the controller includes a PLC controller.

[0052] As a further explanation of the present invention, the controller is also electrically connected to the CO2 sensor 61 to obtain the data detected by the CO2 sensor 61 and calculate the CO2 mixing degree.

[0053] Among them, in the utility model, the opening and closing of the solenoid valve and the flow setting and the reading of the actual flow are controlled by PLC, and the data is uploaded to the computer configuration software, and the flow data is measured in real time. Compressed air and CO2 originally need to be provided on the test site. After the compressed air and CO2 are controlled by gas volume, they are mixed in the same pipeline and flow into the test chamber 6. The CO2 sensor 61 is used to test the concentration at the air intake and exhaust positions of the test chamber 6, and the data is recorded for calculating the CO2 mixing degree.

[0054] As a further explanation of the present invention, the sealed connection and communication method includes sealed connection and communication through pipelines.

[0055] In the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0056] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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 it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0057] The term "comprise" or any other similar term is intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article, or apparatus / device.

[0058] So far, the technical solution of the utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings, but it is easy for those skilled in the art to understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without departing from the principle of the utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the utility model.

Claims

1. A test device for detecting the mixing degree of gas in an environmental chamber, characterized in that: It includes a compressed air storage bin, a CO2 storage bin, a compressed air pretreatment device, an air mass flow controller, a CO2 mass flow controller and a test bin; The compressed air storage bin is sealed and connected to one end of the compressed air pretreatment device and communicates with each other. The compressed air is decompressed after passing through the compressed air pretreatment device and is sealed and connected to at least two air pipelines. An air mass flow controller and a solenoid valve are provided on each of the air pipelines. After passing through the air mass flow controller, each of the air pipelines converges into a first pipeline. After the CO2 storage warehouse is depressurized, it is sealed and connected to at least two CO2 pipelines, each of which is provided with a CO2 mass flow controller and a solenoid valve, and each of the CO2 pipelines is combined into a second pipeline after passing through the CO2 mass flow controller; The first pipeline and the second pipeline are connected to a test chamber, and CO2 sensors are respectively connected to the air inlet and the air outlet of the test chamber to detect the concentration of CO2; The solenoid valve is remotely controlled by a controller based on a set flow rate.

2. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 1, characterized in that: The compressed air pretreatment device at least includes an oil removal filter, a water removal filter and a molecular membrane dryer; One end of the compressed air storage tank is sealed and connected to one end of the oil removal filter, the other end of the oil removal filter is sealed and connected to one end of the water removal filter, the other end of the water removal filter is sealed and connected to one end of the molecular membrane dryer, and the other end of the molecular membrane dryer is sealed and connected to at least two air ducts after decompression.

3. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 2, characterized in that: The other end of the molecular membrane dryer is sealed and connected to at least two air pipes after decompression, and the specific means are: The other end of the molecular membrane dryer is sealed and connected to one end of the first pressure reducing valve and communicated therewith. The other end of the first pressure reducing valve is sealed and connected to at least two air pipelines respectively and communicated therewith.

4. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 1, characterized in that: The CO2 storage bin is sealed and connected to at least two CO2 pipelines after decompression, and the specific means are: The CO2 storage bin is sealed and connected to one end of the second pressure reducing valve and communicated therewith, and the other end of the second pressure reducing valve is sealed and connected to at least two CO2 pipelines respectively and communicated therewith.

5. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 1, characterized in that: The air mass flow controllers respectively arranged on each of the air pipelines allow different flows of compressed air to pass through.

6. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 1, characterized in that: The CO2 mass flow controllers respectively arranged on each of the CO2 pipelines allow different flow rates of CO2 to pass through.

7. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 1, characterized in that: The solenoid valve is electrically connected to a controller, and the controller is used to remotely control the opening and closing of the solenoid valve, the flow rate setting, and the reading of the actual flow rate.

8. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 7, characterized in that: The controller includes a PLC controller.

9. A test device for detecting the mixing degree of gas in an environmental chamber according to claim 7, characterized in that: The controller is also electrically connected to the CO2 sensor to obtain data detected by the CO2 sensor and calculate the CO2 mixing degree.

10. A test device for detecting the mixing degree of gas in an environmental chamber according to any one of claims 1 to 4, characterized in that: The sealed connection and communication method includes sealed connection and communication through pipelines.

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