Gas mixing device

Abstract

The utility model discloses a gas mixing device, relates to the technical field of gas filling, and aims to solve the problem of low matching precision of helium and nitrogen mixed gas. The gas mixing device comprises a gas mixing tank, a first pipeline, a second pipeline and a flow control assembly, wherein the gas mixing tank is used for mixing helium and nitrogen; the first pipeline is communicated with the gas mixing tank and is used for introducing helium into the gas mixing tank; the second pipeline is communicated with the gas mixing tank and is used for introducing nitrogen into the gas mixing tank; at least one of the first pipeline and the second pipeline is provided with a flow control assembly. The flow control assembly comprises a flow adjusting assembly, a flow meter and a pressure reducing assembly, and the flow meter is located between the pressure reducing assembly and the gas mixing tank. The problem that the matching precision of helium and nitrogen mixed gas is not high can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas filling, in particular to a gas mixing device. Background Art

[0002] Equipment with confined spaces such as pipes or cavities, such as heat exchangers and compressors, often require leak testing to ensure the tightness of the equipment. This test typically involves introducing a mixture of helium and nitrogen into the confined space of the equipment to detect leaks.

[0003] In the related art, when helium and nitrogen are mixed, nitrogen and helium are usually directly introduced into a mixed gas tank through a nitrogen supply pipeline and a helium supply pipeline respectively for mixing.

[0004] Thus, due to the large difference between the supply pressure of nitrogen and the supply pressure of helium, the mixing ratio of nitrogen and helium may deviate greatly, thereby affecting the mixing accuracy of nitrogen and helium. Utility Model Content

[0005] The embodiment of the utility model provides a gas mixing device, which solves the problem of low ratio accuracy of helium-nitrogen mixed gas.

[0006] To achieve the above objectives, an embodiment of the present invention adopts the following technical solution: a gas mixing device is provided, comprising: a gas mixing tank, a first pipeline, a second pipeline, and a flow control assembly, wherein the gas mixing tank is used to mix helium and nitrogen; the first pipeline is connected to the gas mixing tank and is used to pass helium into the gas mixing tank; the second pipeline is connected to the gas mixing tank and is used to pass nitrogen into the gas mixing tank; at least one of the first pipeline and the second pipeline is provided with a flow control assembly; the flow control assembly includes a flow regulating assembly, a flow meter, and a pressure reducing assembly, and the flow meter is located between the pressure reducing assembly and the gas mixing tank.

[0007] The present application provides a flow control component on at least one of the first pipeline and the second pipeline (for example, the first pipeline), so as to conveniently control the gas flow of at least one of the first pipeline and the second pipeline. Specifically, taking the flow control component provided on the first pipeline as an example for analysis, the gas pressure of the helium can be reduced by the pressure reducing component, and the nitrogen gas after the gas pressure is reduced flows through the first pipeline to the flow meter. Since the pressure of the helium is reduced, the flow meter can detect the flow of the helium more accurately, so that the flow of the helium can be controlled by adjusting the flow regulating component according to the detected flow of the helium, and then the flow of the helium flowing into the mixing tank can be accurately controlled to improve the ratio accuracy of the helium-nitrogen mixed gas in the mixing tank.

[0008] In some embodiments of the present application, there are two flow control components, and one flow control component is provided for each of the first pipeline and the second pipeline.

[0009] Thus, by providing flow control components in both the first and second pipelines, the flow rates of nitrogen and helium can be precisely controlled. Compared to providing a flow control component in only one of the first and second pipelines, both the flow rates of nitrogen and helium can be made more precise, thereby further improving the ratio accuracy of the helium-nitrogen mixed gas in the gas mixing tank. Furthermore, the improved ratio accuracy of the helium-nitrogen mixed gas in the gas mixing tank can also avoid waste of nitrogen and / or helium.

[0010] In some embodiments of the present application, the pressure reducing assembly includes: a primary pressure reducing valve and a secondary pressure reducing valve, and the secondary pressure reducing valve is connected between the primary pressure reducing valve and the flow meter.

[0011] In this way, by providing a primary and secondary pressure-reducing valve, the helium and / or nitrogen can be gradually decompressed, resulting in a more gradual pressure drop. This prevents a sharp drop in pressure that could affect the stability of the helium and / or nitrogen flow, thereby improving the accuracy of flowmeter detection. Furthermore, providing a primary and secondary pressure-reducing valve can reduce the operating pressure of the primary and secondary pressure-reducing valves. If one of the primary and secondary pressure-reducing valves fails, the other can still reduce the pressure of the gas in the first and / or second pipelines, thereby improving the fault tolerance of the pressure-reducing assembly.

[0012] In some embodiments of the present application, the flow regulating assembly is arranged between the flow meter and the mixing tank; the pressure reducing assembly includes: a pressure detector, the pressure detector is arranged between the flow meter and the flow regulating assembly, and the pressure detector is used to detect the gas pressure of at least one of the first pipeline and the second pipeline.

[0013] In this way, the pressure detector can detect the pressure in the first pipeline and / or the second pipeline, and can adjust the flow rate of helium and / or nitrogen according to the result of the pressure detector, thereby accurately controlling the flow rate of helium and / or nitrogen. The pressure reduction intensity of the pressure reduction component can also be adjusted according to the result of the pressure detector to make the pressure in the first pipeline and / or the second pipeline reach the desired range.

[0014] In some embodiments of the present application, the flow regulating assembly includes: a flow regulating valve and at least one solenoid valve, the flow regulating valve is arranged between the flow meter and the gas mixing tank, and the at least one solenoid valve is arranged between the flow regulating valve and the gas mixing tank.

[0015] In this way, the flow regulating valve can adjust the flow of gas in the first pipeline and / or the second pipeline, so that the flow regulating component can adjust the flow of gas in the first pipeline and / or the second pipeline, so as to accurately control the flow of helium and / or nitrogen flowing into the mixing tank, and improve the ratio accuracy of the helium-nitrogen mixed gas in the mixing tank; the solenoid valve can control the circulation or sealing of the gas in the first pipeline and / or the second pipeline, so that the flow regulating component can control the circulation and / or sealing of the gas in the first pipeline and / or the second pipeline. When the flow control component does not need to work, the solenoid valve can block the pipeline to avoid gas leakage and waste.

[0016] In some embodiments of the present application, the flow control assembly includes: a ball valve, which is arranged between the primary pressure reducing valve and the secondary pressure reducing valve.

[0017] In this way, the ball valve can control the conduction or closing of the pipeline between the first-level pressure-reducing valve and the second-level pressure-reducing valve, and the sealing effect of the ball valve is better. When a component on the first pipeline and / or the second pipeline fails and needs maintenance, the ball valve can be closed to block the first pipeline and / or the second pipeline to prevent helium and / or nitrogen from affecting the maintenance.

[0018] In some embodiments of the present application, the flow control assembly includes: a filter, which is arranged between the ball valve and the secondary pressure reducing valve.

[0019] In this way, the filter can filter the gas passing through the first pipeline and / or the second pipeline to remove impurities such as particulate matter, microorganisms, aerosols, etc., provide a clean gas environment, reduce the damage of impurities to various components in the gas mixing device, extend the service life of the gas mixing device, and reduce the cleaning frequency of other equipment in the first pipeline and / or the second pipeline, thereby reducing the equipment operating costs.

[0020] In some embodiments of the present application, the gas mixing device also includes: an outlet pipe, a second pressure reducing device and a concentration meter, the outlet pipe is connected to the outlet of the gas mixing tank, and is used to introduce the mixed gas into the equipment to be tested; the second pressure reducing device is connected to the outlet pipe; the concentration meter is connected to the outlet pipe, and the second pressure reducing device is located between the concentration meter and the gas mixing tank.

[0021] In this way, an outlet pipe is set at the outlet of the mixing tank, and a concentration meter is set on the outlet pipe. The concentration meter can detect the concentration of the mixed gas formed by helium and nitrogen in the mixing tank, thereby detecting the concentration of the mixed gas introduced into the equipment to be tested. If the concentration does not meet the detection requirements, the flow rate of helium and / or nitrogen can be controlled by the flow regulating component to control the concentration of the mixed gas in the mixing tank. The second pressure reducing device is located between the concentration meter and the mixing tank, which can reduce the pressure of the mixed gas flowing out of the mixing tank to avoid excessive pressure of the mixed gas in the mixing tank and damage to the concentration meter, so as to ensure the normal operation of the concentration meter.

[0022] In some embodiments of the present application, the gas mixing device further includes at least one safety valve, which is installed on the gas mixing tank to open when the internal pressure of the gas mixing tank reaches a preset pressure.

[0023] In this way, the safety valve can open when the internal pressure of the mixing tank reaches the preset pressure to relieve the pressure of the mixing tank, thereby preventing the mixing tank from being damaged due to excessive internal pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the connection relationship of various components in a gas mixing device is provided for an embodiment of the present application;

[0025] Figure 2 One of the schematic diagrams of the connection relationship of the components in the flow control assembly is provided for the embodiment of the present application;

[0026] Figure 3 One of the schematic diagrams of the connection relationship of the components in the flow regulating assembly is provided for the embodiment of the present application;

[0027] Figure 4 One of the schematic diagrams of the connection relationship of the components in the decompression assembly is provided for the embodiment of the present application;

[0028] Figure 5 A second schematic diagram of the connection relationship between the components in the decompression assembly is provided for an embodiment of the present application;

[0029] Figure 6 A second schematic diagram of the connection relationship between the components in the flow regulating assembly is provided for an embodiment of the present application;

[0030] Figure 7 A third schematic diagram of the connection relationship between the components in the flow regulating assembly is provided for an embodiment of the present application;

[0031] Figure 8 A second schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0032] Figure 9 A third schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0033] Figure 10 A fourth schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0034] Figure 11 A fifth schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0035] Figure 12A sixth schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0036] Figure 13 A seventh schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0037] Figure 14 An eighth schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0038] Figure 15 A ninth schematic diagram of the connection relationship between the components in the flow control assembly is provided for an embodiment of the present application;

[0039] Figure 16 A fourth schematic diagram of the connection relationship between the components in the flow regulating assembly is provided for an embodiment of the present application.

[0040] Figure numerals: 100, gas mixing device; 10, gas mixing tank; 11, safety valve; 20, first pipeline; 30, second pipeline; 40, flow control component; 41, flow regulating component; 42, flow meter; 411, flow regulating valve; 412, solenoid valve; 43, pressure reducing component; 431, first-stage pressure reducing valve; 432, second-stage pressure reducing valve; 433, pressure detector; 44, ball valve; 45, filter; 50, outlet pipe; 51, air control valve; 60, second pressure reducing device; 70, concentration meter; 80, first tank body; 81, one-way valve; 90, compressor. DETAILED DESCRIPTION

[0041] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0042] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0043] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 directly connected, or indirectly connected through an intermediate medium, or it can be internal communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. In addition, when describing pipelines or channels, the "connected" and "connected" used in this application have the meaning of conduction. The specific meaning needs to be understood in conjunction with the context.

[0045] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0046] In a helium leak detection system, a mixed gas of helium and nitrogen at a specified pressure and concentration usually needs to be filled into the workpiece. The current method of introducing the helium-nitrogen mixed gas used by helium and nitrogen mixing equipment has a low ratio accuracy due to the different pressures of the helium and nitrogen cylinders. Direct mixing or manual mixing is required, and the mixed gas ratio is not very accurate.

[0047] In order to achieve the above-mentioned purpose, the embodiment of the present invention adopts the following technical solutions: Figure 1 As shown, the gas mixing device 100 includes a gas mixing tank 10, which is used to mix helium and nitrogen.

[0048] Among them, the structure of the gas mixing tank 10 generally includes a tank body, an air inlet, an air outlet, a mixing chamber, etc. Different gases enter the mixing chamber through the air inlet according to a preset flow ratio and are mixed into a mixed gas of a preset concentration in the mixing chamber. The mixed gas is output through the air outlet for subsequent use. In order to ensure the quality and stability of the mixed gas, the gas mixing tank 10 is also equipped with a pressure sensor, a temperature sensor, and a gas concentration sensor. The pressure sensor is used to detect the pressure in the gas mixing tank 10, the temperature sensor is used to detect the temperature in the gas mixing tank 10, and the gas concentration detector is used to detect the gas concentration in the gas mixing tank 10.

[0049] The gas mixing tank 10 can be a binary gas mixing tank, a ternary gas mixing tank, a multi-element gas mixing tank, etc., and this application does not limit this.

[0050] like Figure 1As shown, the gas mixing device 100 further includes: a first pipeline 20 and a second pipeline 30, the first pipeline 20 is connected to the gas mixing tank 10, and is used to pass helium into the gas mixing tank 10; the second pipeline 30 is connected to the gas mixing tank 10, and is used to pass nitrogen into the gas mixing tank 10; at least one of the first pipeline 20 and the second pipeline 30 is provided with a flow control component 40.

[0051] It should be noted that helium and nitrogen are usually stored in steel cylinders. The helium and nitrogen discharged from the steel cylinders are usually at high pressures. The flowmeter 42 cannot effectively detect the flow rates of helium and nitrogen.

[0052] In addition, if Figure 1 、 Figure 2 and Figure 3 As shown, the flow control component 40 can be set in both the first pipeline 20 and the second pipeline 30, or the flow control component 40 can be set in the first pipeline 20 and the flow control component 40 can be not set in the second pipeline 30; or the flow control component 40 can be not set in the first pipeline 20 and the flow control component 40 can be set in the second pipeline 30, and this application does not limit this.

[0053] In this application, the flow control components 40 are provided in both the first pipeline 20 and the second pipeline 30 for exemplary description.

[0054] In some embodiments of the present application, Figure 1 As shown, there are two flow control components 40 , and one flow control component 40 is provided in each of the first pipeline 20 and the second pipeline 30 .

[0055] In this way, by providing a flow control component 40 in the first pipeline 20 and the second pipeline 30, the flow rates of nitrogen and helium can be accurately controlled. Compared with providing a flow control component 40 in only one of the first pipeline 20 and the second pipeline 30, waste of nitrogen and / or helium can be avoided, and the flow rates and concentrations of nitrogen and helium in the mixing tube can be accurately controlled. Moreover, by simultaneously adjusting the flow rates of nitrogen and helium, the gas mixing efficiency of the gas mixing device 100 can be improved.

[0056] It should be noted that the structure of the flow control assembly 40 on the first pipeline 20 may be the same as or different from the structure of the flow control assembly 40 on the second pipeline 30. This application uses the example that the structure of the flow control assembly 40 on the first pipeline 20 is the same as that of the flow control assembly 40 on the second pipeline 30.

[0057] Accordingly, the function of the flow control assembly 40 on the first pipeline 20 on the first pipeline 20 is the same as the function of the flow control assembly 40 on the second pipeline 30 on the second pipeline 30. Therefore, for ease of description, the following description of this application only describes the structure and function of the flow control assembly 40 on the first pipeline 20.

[0058] like Figure 1 As shown, the gas mixing device 100 further includes: a flow control component 40 , which includes a flow regulating component 41 , a flow meter 42 and a pressure reducing component 43 , and the flow meter 42 is located between the pressure reducing component 43 and the gas mixing tank 10 .

[0059] The flow regulating assembly 41 is used to regulate the flow of helium in the first pipeline 20 and may include a flow regulating valve 411. The flow regulating valve 411 is an intuitive and simple flow regulating control device that can directly set the flow rate according to the needs. The flow regulating valve 411 can be a straight-through single-seat regulating valve, an angle double-shutoff valve, an electric low-flow regulating valve 411, etc., which are not limited in this application.

[0060] The flow meter 42 may be a volumetric flow meter, a differential pressure flow meter, a fluid resistance flow meter, a velocity flow meter or a mass flow meter, etc., and this application does not limit this.

[0061] The pressure reducing assembly 43 is used to reduce the pressure of the helium in the first pipeline 20. The pressure reducing assembly 43 can be a pressure reducing valve, a throttling orifice plate, a regulating valve, a safety valve, etc., which is not limited in this application.

[0062] The present application provides a flow control assembly 40 in the first pipeline 20, thereby conveniently controlling the gas flow in the first pipeline 20. The gas pressure of the helium can be reduced by the pressure reducing assembly 43. The helium with reduced gas pressure flows through the first pipeline 20 to the flow meter 42. Since the pressure of the helium is reduced, the flow meter 42 can more accurately detect the flow rate of the helium. Therefore, the flow rate of the helium can be controlled by adjusting the flow regulating assembly 41 according to the detected flow rate of the helium, thereby accurately controlling the flow rate of the helium flowing into the gas mixing tank 10, thereby improving the ratio accuracy of the helium-nitrogen mixed gas in the gas mixing tank 10.

[0063] In some embodiments of the present application, the pressure reducing assembly 43 may include one pressure reducing valve or multiple pressure reducing valves. Figure 1 and Figure 4 As shown, Figure 1 and Figure 2 As shown, the pressure reducing assembly 43 includes: a primary pressure reducing valve 431 and a secondary pressure reducing valve 432 , and the secondary pressure reducing valve 432 is connected between the primary pressure reducing valve 431 and the flow meter 42 .

[0064] The pressure reducing valve reduces the pressure of the helium flowing through the first pipeline 20 by regulating the flow rate of the fluid or gas, thereby adjusting the pressure of the helium to a controllable range and ensuring the safe operation of the first pipeline 20 and its components. The pressure reducing valve not only reduces the pressure of the helium but also automatically adjusts to maintain stable pressure after the valve when the helium pressure fluctuates.

[0065] Both the first-stage pressure-reducing valve 431 and the second-stage pressure-reducing valve 432 can be direct-acting diaphragm pressure-reducing valves, pilot diaphragm pressure-reducing valves, pilot piston pressure-reducing valves, and pilot bellows pressure-reducing valves, etc. The first-stage pressure-reducing valve 431 and the second-stage pressure-reducing valve 432 can use the same type of pressure-reducing valves or different types of pressure-reducing valves, and this application does not limit this.

[0066] In this way, by providing the first-stage pressure-reducing valve 431 and the second-stage pressure-reducing valve 432, the helium gas can be gradually decompressed, resulting in a more gradual drop in the helium gas pressure. This prevents a sharp drop in pressure that could affect the stability of the helium gas flow, thereby improving the accuracy of the flowmeter detection 42. Furthermore, providing the first-stage pressure-reducing valve 431 and the second-stage pressure-reducing valve 432 can reduce the operating pressure of the first-stage pressure-reducing valve 431 and the second-stage pressure-reducing valve 432. If one of the first-stage pressure-reducing valve 431 and the second-stage pressure-reducing valve 432 is damaged, the other can still reduce the pressure of the gas in the first pipeline 20, thereby improving the fault tolerance of the pressure-reducing assembly 43.

[0067] In a possible structural design, the pressure reducing efficiency of the first-stage pressure reducing valve 431 is greater than the pressure reducing efficiency of the second-stage pressure reducing valve 432 .

[0068] In this way, the first-level pressure reducing valve 431 is set on the side close to the helium source to reduce the pressure of the helium. Since the supply pressure of the helium is relatively high, the first-level pressure reducing valve 431 reduces the pressure of the helium for the first time, which can prevent the helium pressure in the first pipeline 20 from being too high and damaging the components on the first pipeline 20. The second-level pressure reducing valve 432 is connected between the first-level pressure reducing valve 431 and the flowmeter 42. The second-level pressure reducing valve 432 can reduce the pressure of the helium in the first pipeline 20 again to reduce the pressure of the helium to the required pressure range, and the pressure of the helium in the first pipeline 20 can be controlled more accurately.

[0069] In addition, the pressure reducing efficiency of the first-stage pressure reducing valve 431 may be lower than that of the second-stage pressure reducing valve 432 . The pressure reducing efficiency of the first-stage pressure reducing valve 431 may be the same as that of the second-stage pressure reducing valve 432 , and this application does not impose any limitation on this.

[0070] In some embodiments of the present application, Figure 1 and Figure 5As shown, the flow regulating component 41 is arranged between the flow meter 42 and the mixing tank 10; the pressure reducing component 43 includes: a pressure detector 433, the pressure detector 433 is arranged between the flow meter 42 and the flow regulating component 41, and the pressure detector 433 is used to detect the gas pressure of at least one of the first pipeline 20 and the second pipeline 30.

[0071] The pressure detector 433 may be of liquid column type, elastic type, load type, electric type, etc., which is not limited in this application.

[0072] Taking the example of a flow control assembly 40 provided in the first pipeline 20, a pressure detector 433 is provided on the first pipeline 20. Thus, the pressure detector 433 can detect the pressure within the first pipeline 20, thereby adjusting the flow rate of helium gas based on the detection result of the pressure detector 433, thereby precisely controlling the flow rate of helium gas. Furthermore, the pressure reduction intensity of the pressure reduction assembly 43 can be adjusted based on the detection result of the pressure detector 433, so that the pressure within the first pipeline 20 reaches a desired range.

[0073] In some embodiments of the present application, Figure 1 and Figure 6 As shown, the flow regulating assembly 41 includes: a flow regulating valve 411 and at least one solenoid valve 412 . The flow regulating valve 411 is arranged between the flow meter 42 and the gas mixing tank 10 , and the at least one solenoid valve 412 is arranged between the flow regulating valve 411 and the gas mixing tank 10 .

[0074] It should be noted that the flow control valve 411 can control the flow of the gas by changing the gas cut-off area, thereby achieving precise regulation of the fluid flow.

[0075] In this way, the flow regulating valve 411 can regulate the flow of helium in the first pipeline 20, so that the flow regulating component 41 can regulate the flow of helium in the first pipeline 20, so as to accurately control the flow of helium flowing into the mixing tank 10, and improve the ratio accuracy of the helium-nitrogen mixed gas in the mixing tank 10. The solenoid valve 412 can control the circulation or sealing of the helium in the first pipeline 20, so that the flow regulating component 41 controls the circulation or sealing of the gas in the first pipeline 20. When the flow control component does not need to work, the solenoid valve can block the pipeline to avoid gas leakage and waste.

[0076] In a possible structural design, such as Figure 1 and Figure 7 As shown, the flow regulating assembly 41 includes: a flow regulating valve 411 and two solenoid valves 412 . The flow regulating valve 411 is arranged between the flow meter 42 and the gas mixing tank 10 , and the two solenoid valves 412 are both arranged between the flow regulating valve 411 and the gas mixing tank 10 .

[0077] In this way, two solenoid valves 412 are set, and both solenoid valves 412 are arranged between the flow regulating valve 411 and the gas mixing tank 10. When one of the solenoid valves 412 is damaged and cannot work normally, the other solenoid valve 412 can also play the role of opening or closing the first pipeline 20, thereby improving the safety and fault tolerance of the flow regulating component 41.

[0078] In a possible structural design, the flow regulating valve 411 may be a needle valve.

[0079] A needle valve is a valve that changes the cross-sectional area of a fluid passage by moving a needle-shaped element. This allows for flow cutoff or regulation by changing the cross-sectional area. Needle valves offer advantages such as high-precision regulation, excellent sealing, high pressure resistance, and durability, improving the overall performance of flow control components.

[0080] In some embodiments of the present application, Figure 1 and Figure 8 As shown, the flow control assembly 40 includes a ball valve 44 , which is disposed between the primary pressure reducing valve 431 and the secondary pressure reducing valve 432 .

[0081] Among them, the ball valve 44 has the characteristics of quick opening and closing, lightness, low fluid resistance, simple structure, small size, light weight, good sealing performance and easy operation and maintenance. The ball valve 44 has a simple structure and is easy to maintain, and the replacement of wearing parts such as sealing rings is simple and quick.

[0082] The ball valve 44 can be a floating ball valve, a fixed ball valve, an elastic ball valve or an oil-sealed ball valve, etc.; the ball valve 44 can also be a direct-energy ball valve, an angle ball valve and a three-way ball valve, etc.; the ball valve 44 can also be a pneumatic ball valve, an electric ball valve and a manual ball valve, etc., which is not limited in this application.

[0083] In this way, the ball valve 44 can control the conduction or closure of the pipeline between the first-level pressure-reducing valve 431 and the second-level pressure-reducing valve 432, and the sealing effect of the ball valve 44 is better. When a component on the first pipeline 20 fails and needs maintenance, the ball valve 44 can be closed to block the first pipeline 20 to prevent helium from affecting the maintenance.

[0084] In some embodiments of the present application, Figure 1 and Figure 9 As shown, the flow control assembly 40 includes a filter 45 , which is disposed between the ball valve 44 and the secondary pressure reducing valve 432 .

[0085] The filter 45 may be an adsorption type gas filter, a chemical reaction type gas filter, or a concentration type gas filter, etc., which is not limited in the present application.

[0086] In this way, the filter 45 can filter the gas passing through the first pipeline 20 to remove impurities such as particulate matter, microorganisms, aerosols, etc., provide a clean gas environment, reduce the damage of impurities to the various components in the gas mixing device 100, extend the service life of the gas mixing device 100, and reduce the cleaning frequency of other equipment in the first pipeline 20, thereby reducing the equipment operating costs.

[0087] In some embodiments of the present application, Figure 1 and Figure 10 As shown, the gas mixing device 100 also includes: an outlet pipe 50, a second pressure reducing device 60 and a concentration meter 70. The outlet pipe 50 is connected to the outlet of the gas mixing tank 10 and is used to introduce the mixed gas into the equipment to be tested; the second pressure reducing device 60 is connected to the outlet pipe 50; the concentration meter 70 is connected to the outlet pipe 50, and the second pressure reducing device 60 is located between the concentration meter 70 and the gas mixing tank 10.

[0088] The concentration meter 70 may be an optical concentration meter, an electrochemical concentration meter, a mass spectrometer concentration meter, etc., which is not limited in this application.

[0089] In this way, an outlet pipe 50 is set at the outlet of the mixing tank 10, and a concentration meter 70 is set on the outlet pipe 50. The concentration meter 70 can detect the concentration of the mixed gas formed by helium and nitrogen in the mixing tank 10, thereby detecting the concentration of the mixed gas introduced into the equipment to be tested. If the concentration does not meet the detection requirements, the flow rate of helium can be controlled by the flow regulating component 41 to control the concentration of the mixed gas in the mixing tank 10. The second pressure reducing device 60 is located between the concentration meter 70 and the mixing tank 10, and can reduce the pressure of the mixed gas flowing out of the mixing tank 10 to avoid the mixed gas pressure in the mixing tank 10 being too high and damaging the concentration meter 70, so as to ensure the normal operation of the concentration meter 70.

[0090] In some embodiments of the present application, Figure 11 、 Figure 12 and Figure 13 As shown, the gas mixing tank 10 is provided with at least one safety valve 11 .

[0091] In this way, when the pressure in the gas mixing tank 10 is too high, the safety valve 11 opens to release the pressure in the gas mixing tank 10, thereby preventing the gas mixing tank 10 from being damaged due to excessive pressure and preventing the gas mixing tank 10 from malfunctioning.

[0092] In a possible structural design, the gas mixing tank 10 is provided with at least one gas control valve 51 , which can control the opening and closing of the outlet of the gas mixing tank 10 to prevent leakage of the gas mixing tank 10 .

[0093] In one possible structural design, Figure 14 and Figure 15As shown, the outlet pipe 50 of the gas mixing tank 10 is connected to the first tank body 80, and a compressor 90 and a one-way valve 81 are provided between the first tank body 80 and the gas mixing tank 10. The compressor 90 is used to compress and pressurize the mixed gas in the gas mixing tank 10 to the required pressure, and to deliver the pressurized mixed gas to the first tank body 80. The mixed gas in the first tank body 80 can be used to detect products.

[0094] In this way, the mixed gas in the gas mixing tank 10 can be compressed to reduce the volume of the mixed gas and store the mixed gas. The one-way valve 81 can also prevent the mixed gas from flowing back and causing damage to other components.

[0095] In one possible structural design, the gas mixing device is controlled by a PLC system. The system performs various actions according to the preset program of the PLC system, and the operation and running status information of the equipment will be completed and displayed on the touch screen.

[0096] In this way, if Figure 1 and Figure 16 As shown, the PLC system has three operating modes: automatic operation, manual operation, and debugging operation, each suitable for different situations. In automatic mode, the PLC system continuously and dynamically monitors the operating status and functional effectiveness of key components, such as whether compressor 90 is overloaded, whether the helium concentration exceeds the limit, and whether the helium / nitrogen replenishment pressure is sufficient. If the gas mixing device has any abnormal operating status, an alarm will be immediately issued, and the severity of the abnormality will determine whether to stop the equipment.

[0097] In the automatic operation state, the PLC system detects the concentration of the mixed gas in the first tank body 80 according to the set concentration detection cycle, and adjusts the flow rate of helium discharged into the mixing tank 10 by controlling the flow control valve, thereby regulating the concentration of helium to the target concentration. During automatic monitoring, if the concentration does not reach the set value, the PLC system will automatically alarm.

[0098] During equipment testing, maintenance and overhaul, the mode can be switched to manual or debugging mode; all solenoid valves 412, ball valves 44, concentration meters 70, pressure gauges 433, etc. can be opened / tested manually, and helium and nitrogen replenishment operations can be performed manually.

[0099] Although the present application is described herein in conjunction with various embodiments, in the process of implementing the claimed application, those skilled in the art may understand and implement other variations of the disclosed embodiments by reviewing the drawings, the disclosure, and the appended claims. In the claims, the word "comprise" does not exclude other components or steps, and "a" or "an" does not exclude multiple components or steps. A single processor or other unit may implement several functions listed in the claims. The fact that certain measures are recorded in different dependent claims does not mean that these measures cannot be combined to produce good results.

[0100] Although the present application has been described with reference to specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present application. Accordingly, this specification and the drawings are merely illustrative of the present application as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present application. Obviously, those skilled in the art may make various modifications and variations to the present application without departing from the spirit and scope of the present application. Thus, the present application is intended to include such modifications and variations as fall within the scope of the claims of the present application and their equivalents.

[0101] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A gas mixing device, characterized in that: include: A gas mixing tank, used for mixing helium and nitrogen; a first pipeline, the first pipeline being in communication with the gas mixing tank and being used to supply helium gas to the gas mixing tank; a second pipeline, the second pipeline being in communication with the gas mixing tank and being used for introducing nitrogen into the gas mixing tank; A flow control component, at least one of the first pipeline and the second pipeline is provided with the flow control component; the flow control component includes a flow regulating component, a flow meter and a pressure reducing component, and the flow meter is located between the pressure reducing component and the gas mixing tank.

2. A gas mixing device according to claim 1, characterized in that: There are two flow control components, and one flow control component is provided in each of the first pipeline and the second pipeline.

3. A gas mixing device according to claim 2, characterized in that: The decompression assembly comprises: First stage pressure reducing valve; A secondary pressure reducing valve is connected between the primary pressure reducing valve and the flow meter.

4. A gas mixing device according to claim 2, characterized in that: The flow regulating assembly is provided between the flow meter and the gas mixing tank; The decompression assembly comprises: A pressure detector is provided between the flow meter and the flow regulating assembly, and is used to detect the gas pressure of at least one of the first pipeline and the second pipeline.

5. A gas mixing device according to claim 2, characterized in that: The flow regulating component comprises: A flow regulating valve, the flow regulating valve being arranged between the flow meter and the gas mixing tank; At least one solenoid valve is provided between the flow regulating valve and the gas mixing tank.

6. A gas mixing device according to claim 3, characterized in that: Flow control components include: A ball valve is provided between the first-stage pressure reducing valve and the second-stage pressure reducing valve.

7. A gas mixing device according to claim 6, characterized in that: Flow control components include: A filter is provided between the ball valve and the secondary pressure reducing valve.

8. A gas mixing device according to claim 1, characterized in that: include: An outlet pipe, connected to the outlet of the gas mixing tank, for introducing the mixed gas into the device to be tested; a second pressure reducing device connected to the outlet pipe; A concentration meter is connected to the outlet pipe, and the second pressure reducing device is located between the concentration meter and the gas mixing tank.

9. A gas mixing device according to claim 8, characterized in that: It also includes at least one safety valve, which is installed on the gas mixing tank and is opened when the internal pressure of the gas mixing tank reaches a preset pressure.

10. A gas mixing device, characterized in that: include: Gas mixing tank; a first pipeline and a second pipeline, wherein the first pipeline is used to introduce helium into the gas mixing tank, and the second pipeline is used to introduce nitrogen into the gas mixing tank, so that the helium and nitrogen are mixed in the gas mixing tank; a flow control assembly, wherein at least one of the first pipeline and the second pipeline is provided with the flow control assembly; The flow control component is used to detect the flow of at least one of the first pipeline and the second pipeline and adjust the flow.

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