Gas humidifier for closed pressure vessels and apparatus thereof

Abstract

The application provides a gas humidifier for a closed pressure container and equipment thereof. The gas humidifier for the closed pressure container comprises a liquid storage tank, a positive pressure gas supply assembly, a gas-liquid injector and a valve path switching assembly. The valve path switching assembly is connected with the liquid storage tank, the positive pressure gas supply assembly and the gas-liquid injector respectively, and is also used for being connected with a sumar tank. The gas humidifier for the closed pressure container can completely blow the humidifying liquid in the pipeline connected with the sumar tank to the sumar tank, so that the humidifying liquid can be prevented from remaining in the sumar tank, the accuracy of the injection amount is improved, and the accuracy of subsequent VOC gas detection is ensured.

Description

Technical Field

[0001] This utility model relates to the field of gas treatment technology, and in particular to a gas humidifier and equipment for a closed pressure vessel. Background Technology

[0002] Volatile organic compounds (VOCs) are organic compounds that have a high saturated vapor pressure (greater than 13.33 Pa), a low boiling point, a small molecular weight, and are easily volatilized at room temperature under standard conditions. These substances are one of the main air pollutants and are commonly referred to as VOCs.

[0003] Currently, the detection method for VOCs in the atmosphere by domestic environmental stations is based on manual detection. In the detection process, a special container called a SUMMA can is used to collect the gas to be tested. After the SUMMA can is collected, it is transferred to the laboratory for further sampling and testing.

[0004] The new national ecological and environmental standard HJ759-2023 explicitly requires that the Summa canister be humidified before calibration of a manual VOC detection system. Although the standard provides calculation formulas and methods for humidification (see Appendix B), in practice, manual injection of liquid into the Summa canister using a syringe is often required. This process is cumbersome, and the humidifying liquid tends to remain adsorbed at the canister opening, resulting in low accuracy of the injection volume and compromising the accuracy of subsequent VOC gas detection. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a gas humidifier and equipment for a closed pressure vessel that does not require manual liquid injection and can avoid humidifying liquid residue at the mouth of the humidifier can, thereby improving the accuracy of the injection volume and ensuring the accuracy of subsequent VOC gas detection.

[0006] The objective of this utility model is achieved through the following technical solution:

[0007] A gas humidifier for a closed pressure vessel, comprising:

[0008] Storage tank;

[0009] Positive pressure air supply components;

[0010] Gas-liquid injector;

[0011] A valve switching assembly is connected to the liquid storage tank, the positive pressure gas supply assembly and the gas-liquid injector respectively, and the valve switching assembly is also used to connect to the Summa tank;

[0012] The valve switching assembly is used to connect the liquid storage tank to the gas-liquid injector when switching to the liquid pumping state.

[0013] The valve switching assembly is used to connect the gas-liquid injector to the Summa canister when switching to the liquid injection state.

[0014] The valve switching assembly is used to connect the positive pressure gas supply assembly to the Summa tank when switching to the exhaust state.

[0015] In one embodiment, the valve switching assembly includes a two-position four-way valve, which is sequentially provided with a first valve port, a second valve port, a third valve port, and a fourth valve port; the liquid storage tank is connected to the first valve port, the positive pressure gas supply assembly is connected to the second valve port, the gas-liquid injector is connected to the third valve port, and the fourth valve port is connected to the Summa tank;

[0016] Specifically, when the two-position four-way valve is switched to the liquid extraction state, the first valve port is connected to the third valve port; when the two-position four-way valve is switched to the liquid injection state, the third valve port is connected to the fourth valve port; and when the two-position four-way valve is switched to the venting state, the second valve port is connected to the fourth valve port.

[0017] A gas humidifier for a closed pressure vessel, comprising:

[0018] Storage tank;

[0019] Positive pressure air supply components;

[0020] Gas-liquid injector;

[0021] A valve switching assembly is connected to the liquid storage tank, the positive pressure gas supply assembly and the gas-liquid injector respectively, and the valve switching assembly is also used to connect to the Summa tank;

[0022] The valve switching assembly is used to connect the liquid storage tank to the gas-liquid injector when switching to the liquid pumping state.

[0023] The valve switching assembly is used to connect the gas-liquid injector to the Summa canister when switching to the liquid injection state.

[0024] The valve switching assembly is used to connect the positive pressure gas supply assembly to the gas-liquid injector through the valve switching assembly when switching to the gas extraction state.

[0025] The valve switching assembly is used to connect the gas-liquid injector to the Summa canister when switching to the exhaust state.

[0026] In one embodiment, the valve switching assembly includes a first two-position three-way solenoid valve and a second two-position three-way solenoid valve connected in series; the first two-position three-way solenoid valve has two first switching valve ports and a first main valve port, and the second two-position three-way solenoid valve has two second switching valve ports and a second main valve port.

[0027] The liquid storage tank and the positive pressure gas supply component are respectively connected to the corresponding first switching valve port, the first main valve port and the Summa tank are respectively connected to the corresponding second switching valve port, and the second main valve port is connected to the gas-liquid injector.

[0028] In one embodiment, the gas humidifier for the closed pressure vessel further includes a diluent; the diluent is connected to a pipeline connecting the valve switching assembly and the SUMMA tank.

[0029] In one embodiment, the gas humidifier for the closed pressure vessel further includes a third two-position three-way solenoid valve, the first end of which is connected to the diluent, the second end of which is connected to the valve switching assembly, and the third end of which is connected to the Summa canister.

[0030] In one embodiment, the gas-liquid injector includes an injector body and a telescopic drive; the power output end of the telescopic drive is connected to the piston rod of the injector body.

[0031] In one embodiment, the gas humidifier for the closed pressure vessel further includes a central control component, which includes a temperature sensor, a control motherboard, and a touch screen; the control motherboard is electrically connected to the temperature sensor, the touch screen, the valve switching component, the third two-position three-way solenoid valve, and the gas-liquid injector.

[0032] In one embodiment, the gas humidifier for the closed pressure vessel further includes a pressure regulating valve and a pressure gauge; the pressure regulating valve and the pressure gauge are sequentially disposed between the positive pressure gas supply component and the valve switching component.

[0033] A gas humidification device for a closed pressure vessel includes a Summa tank and the gas humidifier for a closed pressure vessel described in any of the above embodiments, wherein the valve switching component is connected to the Summa tank.

[0034] Compared with the prior art, the present invention has at least the following advantages:

[0035] This invention relates to a gas humidifier for closed pressure vessels, which can completely blow the humidifying liquid in the pipeline connected to the SUMMA canister into the SUMMA canister, thereby avoiding the humidifying liquid remaining at the mouth of the SUMMA canister. This significantly improves the accuracy of the injection volume and ensures the accuracy of subsequent VOC gas detection.

[0036] Specifically: Before the valve switching assembly operates, the SUMMA tank is first evacuated, and then connected to the gas humidifier for the closed pressure vessel. Then, when the valve switching assembly is switched to the liquid extraction state, the liquid storage tank is connected to the gas-liquid injector, allowing for more accurate liquid extraction. Next, when the valve switching assembly is switched to the liquid injection state, the gas-liquid injector is connected to the SUMMA tank, allowing for liquid injection into the tank. Finally, when the valve switching assembly is switched to the venting state, the positive pressure gas supply assembly is connected to the SUMMA tank, allowing positive pressure gas to directly blow the humidifying liquid in the pipeline connecting the valve switching assembly and the SUMMA tank to the tank.

[0037] Alternatively, when the valve switching assembly is first switched to the liquid extraction state, the liquid storage tank is connected to the gas-liquid injector, allowing for liquid extraction through the gas-liquid injector, thus making the metering and extraction more accurate. Then, when the valve switching assembly is switched to the liquid injection state, the gas-liquid injector is connected to the Summa tank, allowing for liquid injection into the Summa tank through the gas-liquid injector. Next, when the valve switching assembly is switched to the air extraction state, the positive pressure air supply assembly is connected to the gas-liquid injector, allowing for air extraction through the gas-liquid injector. Finally, when the valve switching assembly is switched to the exhaust state, the gas-liquid injector is connected to the Summa tank, allowing for exhaust through the gas-liquid injector, so that the humidifying liquid in the pipeline connecting the valve switching assembly to the Summa tank is completely blown into the Summa tank, and the injected humidifying liquid is vaporized by the negative pressure inside the Summa tank. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the structure of a gas humidifier for a closed pressure vessel in one embodiment;

[0040] Figure 2This is a schematic diagram of the structure of a gas humidifier for a closed pressure vessel in another embodiment;

[0041] Figure 3 for Figure 1 or Figure 2 The diagram shows the electrical connections of a gas humidifier for a closed pressure vessel.

[0042] Reference numerals: 10 for a gas humidifier for a closed pressure vessel; 100 for a liquid storage tank; 200 for a positive pressure gas supply assembly; 210 for a pressure gauge; 300 for a gas-liquid injector; 310 for the injector body; 320 for a telescopic drive component; 400 for a valve switching assembly; 400 for a two-position four-way valve; 401 for the first valve port; 402 for the second valve port; 403 for the third valve port; 404 for the fourth valve port; 410 for the first two-position three-way solenoid valve; 410 for the first switching valve port; 4102 for the first main valve port; 420 for the second two-position three-way solenoid valve; 420 for the second switching valve port; 4202 for the second main valve port; 500 for a suma canister; 600 for the third two-position three-way solenoid valve; 700 for a diluent; 800 for a central control assembly; 810 for a temperature sensor; 820 for a control motherboard; 830 for a touch screen. Detailed Implementation

[0043] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of this utility model. However, this utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0044] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0045] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0046] This disclosure provides a gas humidifier for a closed pressure vessel, including a liquid storage tank, a positive pressure gas supply assembly, a gas-liquid injector, and a valve switching assembly. The valve switching assembly is connected to the liquid storage tank, the positive pressure gas supply assembly, and the gas-liquid injector, and is also connected to a suma canister. When switched to the liquid extraction state, the liquid storage tank is connected to the gas-liquid injector via the valve switching assembly. When switched to the liquid injection state, the gas-liquid injector is connected to the suma canister via the valve switching assembly. When switched to the venting state, the positive pressure gas supply assembly is connected to the suma canister via the valve switching assembly.

[0047] This disclosure also provides a gas humidifier for a closed pressure vessel, comprising a liquid storage tank, a positive pressure gas supply assembly, a gas-liquid injector, and a valve switching assembly. The valve switching assembly is connected to the liquid storage tank, the positive pressure gas supply assembly, and the gas-liquid injector, and is also used to connect to a Summa tank. When switched to the liquid extraction state, the liquid storage tank is connected to the gas-liquid injector via the valve switching assembly. When switched to the liquid injection state, the gas-liquid injector is connected to the Summa tank via the valve switching assembly. When switched to the gas extraction state, the positive pressure gas supply assembly is connected to the gas-liquid injector via the valve switching assembly. When switched to the gas exhaust state, the gas-liquid injector is connected to the Summa tank via the valve switching assembly.

[0048] Please see Figures 1 to 3 To better understand the gas humidifier 10 for closed pressure vessels of this application, the following further explanation is provided:

[0049] One embodiment of a gas humidifier 10 for a closed pressure vessel includes a liquid storage tank 100, a positive pressure gas supply assembly 200, a gas-liquid injector 300, and a valve switching assembly 400. The valve switching assembly 400 is connected to the liquid storage tank 100, the positive pressure gas supply assembly 200, and the gas-liquid injector 300, respectively. The valve switching assembly 400 is also used to connect to a suma canister 500. When switched to the liquid extraction state, the liquid storage tank 100 is connected to the gas-liquid injector 300 via the valve switching assembly 400. When switched to the liquid injection state, the gas-liquid injector 300 is connected to the suma canister 500 via the valve switching assembly 400. When switched to the exhaust state, the positive pressure gas supply assembly 200 is connected to the suma canister 500 via the valve switching assembly 400.

[0050] In this embodiment, the humidifying liquid in the pipeline connected to the Suma can 500 can be completely blown into the Suma can 500, thereby avoiding the humidifying liquid remaining at the mouth of the Suma can 500. This significantly improves the accuracy of the injection volume and ensures the accuracy of subsequent VOC gas detection.

[0051] Specifically, before the valve switching assembly 400 operates, the suma canister 500 is first evacuated, and then the suma canister 500 is connected to the gas humidifier 10 for the closed pressure vessel. Then, when the valve switching assembly 400 switches to the liquid extraction state, the liquid storage tank 100 is connected to the gas-liquid injector 300, allowing for liquid extraction via the gas-liquid injector 300, making the metering more accurate. Next, when the valve switching assembly 400 switches to the liquid injection state, the gas-liquid injector 300 is connected to the suma canister 500, allowing for liquid injection into the suma canister 500. Then, when the valve switching assembly 400 switches to the exhaust state, the positive pressure gas supply assembly 200 is connected to the suma canister 500, allowing positive pressure gas to directly blow the humidifying liquid in the pipeline connecting the valve switching assembly 400 and the suma canister 500 to the suma canister 500, and the negative pressure inside the suma canister 500 vaporizes the injected humidifying liquid.

[0052] It should be noted that the humidifying liquid contained in the storage tank 100 is pure water, benzene, methanol, ethanol, or other VOC standard solutions known to those skilled in the art; similarly, the positive pressure gas contained in the positive pressure gas supply component 200 is nitrogen or other inert gases known to those skilled in the art.

[0053] like Figure 1 As shown, in one embodiment, the valve switching assembly 400 includes a two-position four-way valve, which is sequentially provided with a first valve port 401, a second valve port 402, a third valve port 403, and a fourth valve port 404; the liquid storage tank 100 is connected to the first valve port 401, the positive pressure gas supply assembly 200 is connected to the second valve port 402, the gas-liquid injector 300 is connected to the third valve port 403, and the fourth valve port 404 is connected to the Summa canister 500;

[0054] Specifically, when the two-position four-way valve is switched to the liquid extraction state, the first valve port 401 is connected to the third valve port 403; when the two-position four-way valve is switched to the liquid injection state, the third valve port 403 is connected to the fourth valve port 404; and when the two-position four-way valve is switched to the venting state, the second valve port 402 is connected to the fourth valve port 404.

[0055] It is understood that in this embodiment, the valve switching component 400 is a two-position four-way valve. First, when the two-position four-way valve is switched to the liquid extraction state, the first valve port 401 and the third valve port 403 are connected. Since the liquid storage tank 100 is connected to the first valve port 401 and the gas-liquid injector 300 is connected to the third valve port 403, liquid can be extracted through the gas-liquid injector 300. The gas-liquid injector 300 is used to measure and extract the humidifying liquid, ensuring the accuracy of the extraction, so that the humidifying liquid contained in the liquid storage tank 100 can be drawn into the syringe cavity of the gas-liquid injector 300. Second, when the two-position four-way valve is switched to the liquid injection state, only the third valve port 403 and the fourth valve port 404 are connected. Since the gas-liquid injector 300 is connected to the third valve port 403 and the fourth valve port 404 is connected to the Summa tank 500, the humidifying liquid extracted in the previous step can be injected into the Summa tank 500 through the gas-liquid injector 300. It should be noted that before the two-position four-way valve switches to the venting state, some humidifying liquid still remains in the connecting pipe between the fourth valve port 404 and the Summa tank 500. Finally, when the two-position four-way valve switches to the venting state, the second valve port 402 is connected to the fourth valve port 404. By releasing the positive pressure gas from the positive pressure air supply component 200, the humidifying liquid in the connecting pipe between the fourth valve port 404 and the Summa tank 500 is completely blown into the Summa tank 500. This step can be repeated multiple times to vent the liquid and prevent humidifying liquid from remaining in the opening of the Summa tank 500 and in the connecting pipe.

[0056] It should be noted that the control principle of the two-position four-way valve is existing technology and will not be described in detail here. This application only protects the connection relationship and positional relationship of each component.

[0057] Another embodiment of the gas humidifier 10 for a closed pressure vessel includes a liquid storage tank 100, a positive pressure gas supply assembly 200, a gas-liquid injector 300, and a valve switching assembly 400. The valve switching assembly 400 is connected to the liquid storage tank 100, the positive pressure gas supply assembly 200, and the gas-liquid injector 300, respectively. The valve switching assembly 400 is also used to connect to the Summa tank 500. When switching to the liquid extraction state, the liquid storage tank 100 is connected to the gas-liquid injector 300 via the valve switching assembly 400. When switching to the liquid injection state, the gas-liquid injector 300 is connected to the Summa tank 500 via the valve switching assembly 400. When switching to the gas extraction state, the positive pressure gas supply assembly 200 is connected to the gas-liquid injector 300 via the valve switching assembly 400. When switching to the gas exhaust state, the gas-liquid injector 300 is connected to the Summa tank 500 via the valve switching assembly 400.

[0058] In this embodiment, the humidifying liquid in the pipeline connected to the Suma can 500 can be completely blown into the Suma can 500, thereby avoiding the humidifying liquid remaining at the mouth of the Suma can 500. This significantly improves the accuracy of the injection volume and ensures the accuracy of subsequent VOC gas detection.

[0059] Specifically, before the valve switching assembly 400 operates, the Summa tank 500 is first evacuated, and then the Summa tank 500 is connected to the gas humidifier 10 for the closed pressure vessel. Then, when the valve switching assembly 400 switches to the liquid extraction state, the liquid storage tank 100 is connected to the gas-liquid injector 300, allowing for liquid extraction via the gas-liquid injector 300, making the metering extraction more accurate. Next, when the valve switching assembly 400 switches to the liquid injection state, the gas-liquid injector 300 is connected to the Summa tank 500, allowing for liquid injection into the Summa tank 500 via the gas-liquid injector 300. Finally, when the valve switching assembly 400 switches to the gas extraction state, the positive pressure gas supply assembly... 200 is connected to the gas-liquid injector 300, so that air can be drawn through the gas-liquid injector 300; finally, when the valve switching component 400 is switched to the exhaust state, the gas-liquid injector 300 is connected to the Summa canister 500, so that air can be vented through the gas-liquid injector 300, so that the humidifying liquid in the pipeline connected to the valve switching component 400 to the Summa canister 500 is completely blown to the Summa canister 500, and the injected humidifying liquid is vaporized by the negative pressure inside the Summa canister 200.

[0060] like Figure 2 As shown, in one embodiment, the valve switching assembly 400 includes a first two-position three-way solenoid valve 410 and a second two-position three-way solenoid valve 420 connected to each other; the first two-position three-way solenoid valve 410 has two first switching valve ports 4101 and a first main valve port 4102, and the second two-position three-way solenoid valve 420 has two second switching valve ports 4201 and a second main valve port 4202.

[0061] The liquid storage tank 500 and the positive pressure gas supply component 200 are respectively connected to the corresponding first switching valve port 4101, the first main valve port 4102 and the Summa tank 500 are respectively connected to the corresponding second switching valve port 4201, and the second main valve port 4202 is connected to the gas-liquid injector 300.

[0062] It is understood that in this embodiment, two two-position three-way solenoid valves are connected in series. Specifically, the liquid storage tank 500 is connected to one of the first switching valve ports 4101, the positive pressure gas supply component 200 is connected to the other of the first switching valve ports 4101, and the first main valve port 4102 needs to be connected to one of the second switching valve ports 4201. The second main valve port 4202 needs to be connected to the gas-liquid injector 300, and the humidifier 500 is connected to the other of the second switching valve ports 4201. Thus, the two two-position three-way solenoid valves realize the switching from the liquid extraction state to the gas exhaust state, that is, the steps of liquid extraction, liquid injection, gas extraction and gas exhaust are completed in sequence, replacing the manual liquid injection method, thereby avoiding the humidifying liquid residue at the mouth of the humidifier 500. This improves the accuracy of the injection volume and ensures the accuracy of subsequent VOC gas detection.

[0063] Furthermore, during the actual humidification operation, after the liquid extraction stage, there will be some humidifying liquid in the connecting pipe between the first main valve port 4102 and one of the first switching valve ports 410. This allows the humidifying liquid in the connecting pipe to be simultaneously drawn into the syringe cavity of the gas-liquid injector 300 during the subsequent air extraction process. Therefore, after the exhaust stage, the second main valve port 4202 is switched to the first main valve port 4102, so that the humidifying liquid in the syringe cavity of the gas-liquid injector 300 can be backfilled into the connecting pipe between the first main valve port 4102 and one of the first switching valve ports 410. This ensures that when the next cycle begins the liquid extraction step, the connecting pipe between the liquid storage tank 100 and the gas-liquid injector 300 is filled with humidifying liquid, thereby ensuring the accuracy of liquid extraction by the gas-liquid injector 300 and ensuring that the gas-liquid injector 300 does not contain positive pressure gas during the process.

[0064] It should be noted that the control principle of the two-position three-way solenoid valve is existing technology and will not be elaborated here. This application only protects the connection relationship and positional relationship of each component.

[0065] like Figure 1 and Figure 2 As shown, in the two embodiments described above, the gas humidifier 10 for the closed pressure vessel further includes a diluent 700; the diluent 700 is connected to the pipeline connecting the valve switching assembly 400 and the Summa tank 500. This allows the diluent 700 and the valve switching assembly 400 to be connected in parallel, eliminating the need for frequent manual disassembly and reassembly of each pipeline.

[0066] like Figure 1 and Figure 2As shown, in one embodiment, the gas humidifier 10 for the closed pressure vessel further includes a third two-position three-way solenoid valve 600. The first end of the third two-position three-way solenoid valve 600 is connected to the diluent 700, the second end of the third two-position three-way solenoid valve 600 is connected to the valve switching assembly 400, and the third end of the third two-position three-way solenoid valve 600 is connected to the Summa tank 500. Thus, the third two-position three-way solenoid valve 600 automatically connects the diluent 700 to the pipeline between the valve switching assembly 400 and the Summa tank 500, allowing the VOC gas after humidification in the Summa tank 500 to be directly switched to the diluent 700 for pretreatment and analysis via the third two-position three-way solenoid valve 600, eliminating the need for frequent manual disassembly and reconnection of the various pipelines.

[0067] like Figure 1 and Figure 2 As shown, in one embodiment, the gas-liquid injector 300 includes an injector body 310 and a telescopic drive member 320; the power output end of the telescopic drive member 320 is connected to the piston rod of the injector body 310. Thus, the piston rod of the injector body 310 can be driven to slide by the telescopic drive member 320, thereby achieving automatic liquid or gas aspiration. Specifically, the telescopic drive member 320 can be an electric cylinder or a pneumatic cylinder.

[0068] like Figure 3 As shown, in one embodiment, the gas humidifier 10 for the closed pressure vessel further includes a central control component 800, which includes a temperature sensor 810 (not shown), a control motherboard 820, and a touch screen 830 (not shown). The control motherboard 820 is electrically connected to the temperature sensor 810, the touch screen 830, the valve switching component 400, the third two-position three-way solenoid valve 600, and the gas-liquid injector 300.

[0069] It is understandable that by setting the control motherboard 820 to control the various components to work together, such as the temperature sensor 810 being able to automatically acquire ambient temperature data and transmit the ambient temperature value to the control motherboard 820, the required injection volume can be calculated by the built-in calculation formula of the control motherboard 820 and the user inputting other corresponding values ​​through the touch screen 830. This replaces the manual calculation required for manual injection and the operation method of relying on the human eye to observe the scale value of the syringe during liquid aspiration and injection, improving the automation level of humidification operation and significantly improving the accuracy of injection volume, thus ensuring the accuracy of subsequent VOC gas detection.

[0070] Furthermore, in this embodiment, the control motherboard 820 is electrically connected to the telescopic drive 320, thereby controlling the telescopic drive 320 to drive the piston rod of the syringe body 310 to work.

[0071] It should be noted that the control method of the control motherboard 820 to control the coordinated operation of various components is existing technology and will not be described in detail here. This application only protects the connection relationship and positional relationship of each component.

[0072] like Figure 1 and Figure 2 As shown in the two embodiments described above, the gas humidifier 10 for the closed pressure vessel further includes a pressure regulating valve (not shown) and a pressure gauge 210; the pressure regulating valve and the pressure gauge 210 are sequentially arranged between the positive pressure gas supply component 200 and the valve switching component 400. Thus, the pressure from the positive pressure gas supply component 200 to the valve switching component 400 can be adjusted by the pressure regulating valve, thereby regulating the flow rate and velocity of the positive pressure gas released in the pipeline, achieving a more precise gas output, while the pressure gauge 210 detects the pressure value in the pipeline between the positive pressure gas supply component 200 and the valve switching component 400.

[0073] It should also be noted that the gas humidifier for closed pressure vessels in this application is not limited to humidifying the SUMMA canister in VOC analysis, but can also be applied to standard gas in standard diluents or other scenarios where liquid needs to be vaporized and humidified into a closed pressure vessel.

[0074] This application also provides a gas humidification device for a closed pressure vessel, including a Summa tank 500 and the gas humidifier for a closed pressure vessel described in any of the above embodiments, wherein the valve switching component 400 is connected to the Summa tank 500.

[0075] Compared with the prior art, the present invention has at least the following advantages:

[0076] This invention relates to a gas humidifier for closed pressure vessels, which can completely blow the humidifying liquid in the pipeline connected to the SUMMA canister into the SUMMA canister, thereby avoiding the humidifying liquid remaining at the mouth of the SUMMA canister. This significantly improves the accuracy of the injection volume and ensures the accuracy of subsequent VOC gas detection.

[0077] Specifically: Before the valve switching assembly operates, the SUMMA tank is first evacuated, and then connected to the gas humidifier for the closed pressure vessel. Then, when the valve switching assembly is switched to the liquid extraction state, the liquid storage tank is connected to the gas-liquid injector, allowing for more accurate liquid extraction. Next, when the valve switching assembly is switched to the liquid injection state, the gas-liquid injector is connected to the SUMMA tank, allowing for liquid injection into the tank. Finally, when the valve switching assembly is switched to the venting state, the positive pressure gas supply assembly is connected to the SUMMA tank, allowing positive pressure gas to directly blow the humidifying liquid in the pipeline connecting the valve switching assembly and the SUMMA tank to the tank.

[0078] Alternatively, when the valve switching assembly is first switched to the liquid extraction state, the liquid storage tank is connected to the gas-liquid injector, allowing for liquid extraction through the gas-liquid injector, thus making the metering and extraction more accurate. Then, when the valve switching assembly is switched to the liquid injection state, the gas-liquid injector is connected to the Summa tank, allowing for liquid injection into the Summa tank through the gas-liquid injector. Next, when the valve switching assembly is switched to the air extraction state, the positive pressure air supply assembly is connected to the gas-liquid injector, allowing for air extraction through the gas-liquid injector. Finally, when the valve switching assembly is switched to the exhaust state, the gas-liquid injector is connected to the Summa tank, allowing for exhaust through the gas-liquid injector, so that the humidifying liquid in the pipeline connecting the valve switching assembly to the Summa tank is completely blown into the Summa tank, and the injected humidifying liquid is vaporized by the negative pressure inside the Summa tank.

[0079] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A gas humidifier for a closed pressure vessel, characterized in that, include: Storage tank; Positive pressure air supply components; Gas-liquid injector; A valve switching assembly is connected to the liquid storage tank, the positive pressure gas supply assembly and the gas-liquid injector respectively, and the valve switching assembly is also used to connect to the Summa tank; The valve switching assembly is used to connect the liquid storage tank to the gas-liquid injector when switching to the liquid pumping state. The valve switching assembly is used to connect the gas-liquid injector to the Summa canister when switching to the liquid injection state. The valve switching assembly is used to connect the positive pressure gas supply assembly to the Summa tank when switching to the exhaust state.

2. The gas humidifier for a closed pressure vessel according to claim 1, characterized in that, The valve switching assembly includes a two-position four-way valve, which is sequentially provided with a first valve port, a second valve port, a third valve port, and a fourth valve port; the liquid storage tank is connected to the first valve port, the positive pressure gas supply assembly is connected to the second valve port, the gas-liquid injector is connected to the third valve port, and the fourth valve port is connected to the Suma tank; Specifically, when the two-position four-way valve is switched to the liquid extraction state, the first valve port is connected to the third valve port; when the two-position four-way valve is switched to the liquid injection state, the third valve port is connected to the fourth valve port; and when the two-position four-way valve is switched to the venting state, the second valve port is connected to the fourth valve port.

3. A gas humidifier for a closed pressure vessel, characterized in that, include: Storage tank; Positive pressure air supply components; Gas-liquid injector; A valve switching assembly is connected to the liquid storage tank, the positive pressure gas supply assembly and the gas-liquid injector respectively, and the valve switching assembly is also used to connect to the Summa tank; The valve switching assembly is used to connect the liquid storage tank to the gas-liquid injector when switching to the liquid pumping state. The valve switching assembly is used to connect the gas-liquid injector to the Summa canister when switching to the liquid injection state. The valve switching assembly is used to connect the positive pressure gas supply assembly to the gas-liquid injector through the valve switching assembly when switching to the gas extraction state. The valve switching assembly is used to connect the gas-liquid injector to the Summa canister when switching to the exhaust state.

4. The gas humidifier for a closed pressure vessel according to claim 3, characterized in that, The valve switching assembly includes a first two-position three-way solenoid valve and a second two-position three-way solenoid valve that are connected to each other; the first two-position three-way solenoid valve has two first switching valve ports and a first main valve port, and the second two-position three-way solenoid valve has two second switching valve ports and a second main valve port. The liquid storage tank and the positive pressure gas supply component are respectively connected to the corresponding first switching valve port, the first main valve port and the Summa tank are respectively connected to the corresponding second switching valve port, and the second main valve port is connected to the gas-liquid injector.

5. The gas humidifier for a closed pressure vessel according to claim 1 or 3, characterized in that, The gas humidifier for the closed pressure vessel also includes a diluent; the diluent is connected to the pipeline connecting the valve switching assembly and the Summa tank.

6. The gas humidifier for a closed pressure vessel according to claim 5, characterized in that, The gas humidifier for the closed pressure vessel also includes a third two-position three-way solenoid valve. The first end of the third two-position three-way solenoid valve is connected to the diluent, the second end of the third two-position three-way solenoid valve is connected to the valve switching assembly, and the third end of the third two-position three-way solenoid valve is connected to the Summa tank.

7. The gas humidifier for a closed pressure vessel according to claim 1 or 3, characterized in that, The gas-liquid injector includes an injector body and a telescopic drive component; the power output end of the telescopic drive component is connected to the piston rod of the injector body.

8. The gas humidifier for a closed pressure vessel according to claim 6, characterized in that, The gas humidifier for the closed pressure vessel also includes a central control component, which includes a temperature sensor, a control motherboard, and a touch screen. The control motherboard is electrically connected to the temperature sensor, the touch screen, the valve switching component, the third two-position three-way solenoid valve, and the gas-liquid injector.

9. The gas humidifier for a closed pressure vessel according to claim 1 or 3, characterized in that, The gas humidifier for the closed pressure vessel also includes a pressure regulating valve and a pressure gauge; the pressure regulating valve and the pressure gauge are sequentially arranged between the positive pressure gas supply component and the valve switching component.

10. A gas humidification device for a closed pressure vessel, characterized in that, The invention includes a Summa canister and a gas humidifier for a closed pressure vessel as described in any one of claims 1-9, wherein the valve switching assembly is connected to the Summa canister.

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