A portable gas dilution apparatus

Abstract

This invention provides a portable gas dilution device, comprising a standard gas path, a dilution gas path, and a mixed gas path. The dilution gas path includes a detachable dilution gas cylinder, a miniature pressure reducing valve, a filter, a dilution gas pressure gauge, and a one-way valve connected in sequence. The standard gas path includes a detachable standard gas cylinder, a miniature pressure reducing valve, a filter, a standard gas pressure gauge, and a one-way valve connected in sequence. The mixed gas path includes a spiral mixing tube. The inlet of the mixing tube is connected to the one-way valves of the dilution gas path and the standard gas path, and the outlet of the mixing tube is provided with a quick-connect interface for connecting to a gas detector. This invention effectively solves the bottleneck problems of traditional gas dilution devices, which are large in size and complex in structure, making them only suitable for laboratory settings in practical use, and the difficulties in handling and operation of gas cylinders in field operations.

Description

Technical Field

[0001] This utility model relates to the field of metrology and testing technology, and in particular to a portable gas dilution instrument. Background Technology

[0002] Currently, my country has seven national verification procedures and calibration standards that explicitly allow the use of gas dilution devices. These are all revised or newly released versions in recent years, specifically covering the following: Verification Procedure for Combustible Gas Detectors and Alarms; Verification Procedure for Ammonia Detectors; Verification Procedure for Hydrogen Sulfide Gas Detectors; Verification Procedure for Sulfur Dioxide Gas Detectors; Calibration Standard for Chlorine Detectors and Alarms; Calibration Standard for Sulfur Hexafluoride Detectors and Alarms; and Calibration Standard for Hydrogen Chloride Gas Detectors and Alarms. With the continuous improvement and updating of national metrological technical standards, gas dilution devices, as core equipment for achieving accurate measurement value transfer and ensuring the reliability of test data, are playing an increasingly important role in the field of gas detection.

[0003] Currently, my country's gas dilution device market is characterized by numerous manufacturers and inconsistent product performance. Devices from different manufacturers exhibit significant differences in core technical specifications, with some products having low dilution accuracy, failing to meet the demands of high-precision gas detection and leading to actual dilution errors exceeding expectations. Furthermore, over 70% of testing operations require personnel to carry equipment to customer sites. However, due to inherent limitations in traditional design concepts and mechanical structures, most gas dilution devices on the market are generally bulky and heavy, failing to meet the portability requirements for on-site operations. They are only suitable for laboratory settings, significantly limiting their application in actual industrial sites or emergency testing scenarios, creating a huge gap between the application of testing technology and actual needs.

[0004] Therefore, in on-site verification and calibration operations, technical bottlenecks and safety risks coexist, severely restricting the efficient conduct of testing work. The main difficulties can be summarized as follows: (1) The types of gases to be measured are diverse and the measurement range is extremely wide, covering concentrations from low to high. -9 Levels up to high concentrations of 10 -2 level; (2) Traditional steel cylinders are the main carriers of standard gases. They are large in size and heavy in weight, making them extremely inconvenient to carry. Transporting a large number of standard gases in steel cylinders poses a great safety hazard and increases the difficulty and risk of on-site operations.

[0005] (3) Traditional gas dilution devices rely on external gas sources and are complex to operate on site.

[0006] In summary, given the challenges of diverse gas types, wide range of measurement ranges, hazardous gas cylinder transportation, and inconvenient operation during on-site verification and calibration, developing a portable gas dilution device that can be easily carried to the work site has become a critical issue that urgently needs to be addressed. Summary of the Invention

[0007] To address the problems in the existing technology, this utility model provides a portable gas dilution device, which can effectively solve the bottleneck problems of traditional gas dilution devices being only suitable for laboratory scenarios due to their large size and complex structure, as well as the difficulties in handling and operation of gas cylinders in field operations.

[0008] To achieve the above objectives, this utility model provides the following technical solution: A portable gas dilution device includes a standard gas path, a dilution gas path, and a mixed gas path, with the standard gas path and the dilution gas path merging into the mixed gas path. The dilution gas path includes, in sequence, a detachable dilution gas cylinder for holding the dilution gas, a miniature pressure reducing valve, a filter, a dilution gas pressure gauge, and a one-way valve. The standard gas path includes, in sequence, a detachable standard gas cylinder for holding the standard gas to be diluted, a miniature pressure reducing valve, a filter, a standard gas pressure gauge, and a one-way valve. The mixed gas path includes a spiral mixing tube. The inlet of the mixing tube is connected to the one-way valves of the dilution gas path and the standard gas path, and the outlet of the mixing tube is provided with a quick-connect interface for connecting to a gas detector.

[0009] In a preferred embodiment, the filter of the dilution gas path is also connected to an external air inlet. Therefore, the dilution gas path can provide not only high-purity dilution gases, such as nitrogen, but also dry air, to meet the needs of diluting gases of different concentrations.

[0010] In a preferred embodiment, a three-way solenoid valve is further provided between the filter and the dilution gas pressure gauge in the dilution gas path; the normally closed channel of the three-way solenoid valve is connected to an air pump, and the outlet of the air pump is connected to a check valve; the normally open channel of the three-way solenoid valve is also connected to a check valve; the outlet of the check valve connected to the air pump and the outlet of the check valve connected to the normally open channel of the three-way solenoid valve are both connected to the dilution gas pressure gauge.

[0011] In a preferred embodiment, a dilution gas flow controller is also provided between the dilution gas pressure gauge and the one-way valve in the dilution gas path.

[0012] In a preferred embodiment, a standard gas flow controller is further provided between the standard gas pressure gauge and the one-way valve in the standard gas circuit.

[0013] By using a dilution gas flow controller and a standard gas flow controller, the flow rates and mixing ratios of the dilution gas and standard gas can be precisely controlled. This allows for the rapid and accurate preparation of standard gases of various concentrations on-site, effectively solving the problems of traditional gas dilution devices relying on external gas sources and complex on-site operations. This significantly improves the efficiency and accuracy of gas detection, providing more convenient and reliable technical support for on-site verification and calibration. Standard gases of different concentration gradients can be precisely mixed according to actual testing needs, effectively meeting requirements from 10... -9 Up to 10 -2 Diverse detection scenarios at all levels.

[0014] In a preferred embodiment, the diluent gas cylinder is a nitrogen cylinder, and the diluent gas is nitrogen.

[0015] In a preferred embodiment, the diluent gas cylinder is further provided with a diluent gas filling port, which is a one-way filling port.

[0016] In a preferred embodiment, the standard gas cylinder is further provided with a standard gas filling port, which is a one-way filling port.

[0017] By providing dilution gas filling ports for the dilution gas cylinders and standard gas filling ports for the standard gas cylinders, and by adopting a detachable standard design for both the dilution gas cylinders and the standard gas cylinders, different dilution gases or standard gases can be configured according to actual testing needs. For example, the dilution gas cylinders and standard gas cylinders can adopt a detachable small steel cylinder design, supporting the rapid replacement of different types of gases. Whether it is common combustible gases such as methane and carbon monoxide, or toxic and harmful gases such as hydrogen sulfide and chlorine, they can all be adapted as needed, greatly expanding the application range of the device and providing an efficient, convenient and comprehensive gas solution for on-site verification and calibration work.

[0018] In summary, compared with the prior art, the advantages of this portable gas dilution device are: 1. This utility model integrates a built-in standard gas cylinder and a dilution gas cylinder, and is equipped with a high-precision flow control system. It can accurately mix standard gases of different concentration gradients according to actual testing needs, effectively meeting the requirements from 10... -9 Up to 10 -2 It can handle a wide range of testing scenarios. Its detachable small steel cylinder design is particularly flexible, supporting quick replacement of different types of gases. Whether it is common combustible gases such as methane and carbon monoxide, or toxic and harmful gases such as hydrogen sulfide and chlorine, it can be adapted as needed, greatly expanding the application range of the device and providing an efficient, convenient and comprehensive gas solution for on-site verification and calibration work.

[0019] 2. This utility model further enhances the field applicability of the portable gas dilution device. The device incorporates a standard gas cylinder and a dilution gas cylinder. The standard gas cylinder will cover a variety of common toxic and harmful gases, such as methane, carbon monoxide, and hydrogen sulfide, with concentrations ranging from 10... -9 Up to 10 -2 The dilution gas cylinders provide high-purity nitrogen, dry air, etc., to meet the needs of diluting gases of different concentrations. By precisely controlling the gas flow rate and mixing ratio of the built-in gas cylinders, this device can quickly and accurately prepare standard gases of various concentrations on-site, effectively solving the problems of traditional gas dilution devices relying on external gas sources and complex on-site operation, greatly improving the efficiency and accuracy of gas detection, and providing more convenient and reliable technical support for on-site verification and calibration work.

[0020] 3. By adopting the technical solution of this utility model, dilution gas cylinders and standard gas cylinders can be manufactured into standardized, detachable small steel cylinders. This allows for the simultaneous carrying of multiple standardized, detachable small steel cylinders (nitrogen cylinders, standard gas cylinders), meeting the calibration and verification needs of gas detectors with different gases and ranges. This design makes it easier and more convenient for testing personnel to travel to the field, eliminating the inconvenience of carrying bulky traditional equipment.

[0021] 4. By adopting the technical solution of this utility model, because of the modular structure design, the portable gas dilution device can be made of lightweight materials, effectively reducing the weight of the whole machine and keeping the weight of the whole machine within 6 kg, which greatly improves the portability of the equipment.

[0022] 5. Compared to traditional gas dilution devices, which are often only suitable for laboratory settings due to their large size and complex structure, and face numerous bottlenecks such as difficulty in transportation and operational limitations when using gas cylinders in field operations, this portable gas dilution device can be made of lightweight materials and can easily cope with complex and ever-changing operating environments such as industrial sites and emergency rescues. It can be flexibly deployed in both high-temperature and high-humidity chemical workshops and confined spaces. This device effectively improves detection efficiency and data accuracy with its stable and reliable performance, providing strong support for the verification and calibration of gas detectors. Attached Figure Description

[0023] Figure 1 This is a schematic diagram illustrating the principle of a portable gas dilution device according to this utility model. Detailed Implementation

[0024] Reference Figure 1 The present invention provides a further description of a portable gas dilution device.

[0025] like Figure 1As shown, a portable gas dilution device includes a standard gas path, a dilution gas path, and a mixed gas path, with the standard gas path and the dilution gas path merging into the mixed gas path. The dilution gas path includes, in sequence, a detachable dilution gas cylinder (in this embodiment, the dilution gas cylinder is a nitrogen cylinder, and the dilution gas is nitrogen), a miniature pressure reducing valve, a filter, a dilution gas pressure gauge, and a one-way valve. The standard gas path includes, in sequence, a detachable standard gas cylinder for holding the standard gas to be diluted, a miniature pressure reducing valve, a filter, a standard gas pressure gauge, and a one-way valve. The mixed gas path includes a spiral mixing tube. The inlet of the mixing tube is connected to the one-way valves of the dilution gas path and the standard gas path, and the outlet of the mixing tube is provided with a quick-connect interface for connecting to a gas detector. The filter of the dilution gas path is also connected to an external air inlet. In a preferred embodiment, a dilution gas flow controller is also provided between the dilution gas pressure gauge and the one-way valve in the dilution gas path. A standard gas flow controller is also installed between the standard gas pressure gauge and the one-way valve in the standard gas circuit. Through the dilution gas flow controller and the standard gas flow controller, the gas flow rate and mixing ratio of the dilution gas and standard gas can be precisely controlled. This allows the present invention to quickly and accurately prepare standard gases of various concentrations on-site, effectively solving the problems of traditional gas dilution devices relying on external gas sources and complex on-site operation, greatly improving the efficiency and accuracy of gas detection, and providing more convenient and reliable technical support for on-site verification and calibration. Standard gases of different concentration gradients can be precisely mixed according to actual detection needs, effectively meeting requirements from 10... -9 Up to 10 -2 Diverse detection scenarios at all levels.

[0026] In a preferred embodiment, the diluent gas cylinder is further provided with a diluent gas filling port, which is a one-way filling port. The standard gas cylinder is further provided with a standard gas filling port, which is also a one-way filling port.

[0027] A three-way solenoid valve is also provided between the filter and the dilution gas pressure gauge in the dilution gas path; the normally closed channel of the three-way solenoid valve is connected to an air pump, and the outlet of the air pump is connected to a check valve; the normally open channel of the three-way solenoid valve is also connected to a check valve; the outlet of the check valve connected to the air pump and the outlet of the check valve connected to the normally open channel of the three-way solenoid valve are both connected to the dilution gas pressure gauge.

[0028] The working principle of this utility model is as follows: The high-purity dilution gas provided by the dilution gas circuit is reduced in pressure by the miniature pressure reducing valve of the dilution gas circuit, and then filtered together with dry air through the dilution gas filter. After passing through the dilution gas flow controller, it enters the mixing tube of the mixed gas circuit. The standard gas provided by the standard gas circuit passes through the miniature pressure reducing valve, the standard gas filter, and the standard gas flow controller of the standard gas circuit before entering the mixing tube of the mixed gas circuit. After the dilution gas and the standard gas are fully mixed and homogeneous in the spiral mixing tube, they enter the gas detector through the outlet of the mixing tube for detection.

[0029] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. It should be noted that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A portable gas dilution device, characterized in that: It includes a standard gas path, a dilution gas path, and a mixed gas path, with the standard gas path and the dilution gas path merging into the mixed gas path. The dilution gas path includes, in sequence, a detachable dilution gas cylinder for holding the dilution gas, a miniature pressure reducing valve, a filter, a dilution gas pressure gauge, and a one-way valve. The standard gas path includes, in sequence, a detachable standard gas cylinder for holding the standard gas to be diluted, a miniature pressure reducing valve, a filter, a standard gas pressure gauge, and a one-way valve. The mixed gas path includes a spiral mixing tube. The inlet of the mixing tube is connected to the one-way valves of the dilution gas path and the standard gas path, and the outlet of the mixing tube is provided with a quick-connect interface for connecting to a gas detector.

2. The portable gas dilution device according to claim 1, characterized in that: The filter in the dilution gas path is also connected to an external air inlet.

3. A portable gas dilution device according to claim 1, characterized in that: A three-way solenoid valve is also provided between the filter and the dilution gas pressure gauge in the dilution gas path; the normally closed channel of the three-way solenoid valve is connected to an air pump, and the outlet of the air pump is connected to a check valve; the normally open channel of the three-way solenoid valve is also connected to a check valve; the outlet of the check valve connected to the air pump and the outlet of the check valve connected to the normally open channel of the three-way solenoid valve are both connected to the dilution gas pressure gauge.

4. A portable gas dilution device according to claim 1, characterized in that: A dilution gas flow controller is also installed between the dilution gas pressure gauge and the check valve in the dilution gas circuit.

5. A portable gas dilution apparatus according to claim 1, characterized in that: A standard gas flow controller is also provided between the standard gas pressure gauge and the one-way valve in the standard gas circuit.

6. A portable gas dilution device according to claim 1, characterized in that: The diluent gas cylinder is a nitrogen cylinder, and the diluent gas is nitrogen.

7. A portable gas dilution apparatus according to claim 1, characterized in that: The dilution gas cylinder is also equipped with a dilution gas filling port, which is a one-way filling port.

8. A portable gas dilution device according to claim 1, characterized in that: The standard gas cylinder is also equipped with a standard gas filling port, which is a one-way filling port.

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