Pressure relief gas circuit structure and gas measuring device

Abstract

The utility model provides a pressure relief gas circuit structure and a gas measuring device. The pressure relief gas circuit structure comprises a gas inlet valve and a pressure relief valve which are sequentially arranged on a gas circuit. One end of the air inlet valve is connected to the air path air inlet, and the other end of the air inlet valve is connected to the input end of the pressure release valve; the pressure release valve is further provided with a normally-open output end and a normally-closed output end, and the normally-closed output end is connected to the gas consumption element. The normally open output end is conducted to the outside of the gas path; the normally-open output end plays a role in the initial ventilation stage of the gas circuit, is directly guided to the outside of the gas circuit and is used for discharging large-amplitude gas flow pulses possibly generated in the initial ventilation stage, so that the impact of the gas flow pulses on subsequent elements is effectively reduced, meanwhile, the unstable gas flow state is guided to the outside of the system, and the service life of the system is prolonged. The interference on the subsequent gas measurement or treatment process is avoided. After the initial gas flow pulse is effectively discharged and passes through a preset time period, the pressure release valve is switched to supply gas to the gas consumption element through the normally closed output end, and therefore it is ensured that the gas consumption element receives stable gas flow.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of gas measuring devices, and more particularly relates to a pressure relief gas path structure and a gas measuring device. BACKGROUND

[0002] Gas measuring devices are widely used in environmental monitoring, industrial process control, medical health and other fields, and are used to accurately measure the concentration, flow rate and other key parameters of various gases. Such devices usually include at least one reaction measuring unit designed to receive a gas sample to be measured and convert or sense the characteristics of the gas through a specific chemical reaction or physical process, thereby realizing quantitative analysis of the gas.

[0003] However, in actual operation, especially in the initial stage when the gas sample is introduced into the measuring system, that is, in the moment when the inlet valve is opened, a phenomenon called "hammer effect" is often encountered. The hammer effect refers to the fact that when the inlet valve is quickly opened, due to the sudden release of gas pressure in the pipeline or the rapid influx of external high-pressure gas, a strong gas flow pulse impacts the reaction measuring unit. This sudden change in gas pressure not only causes the measured gas to flow into the measuring chamber at an extremely fast speed, but also may be accompanied by the generation of vortex and turbulent flow, seriously interfering with the uniform distribution and stable flow of the gas sample in the measuring chamber.

[0004] More critically, this rapid gas flow often leads to rapid changes in gas concentration in the measuring chamber, making it difficult for sensors or detectors to capture stable and accurate signals in a short time, thereby greatly affecting the accuracy and repeatability of the measurement. CONTENT OF THE INVENTION

[0005] The purpose of the embodiments of the application is to provide a pressure relief gas path structure and a gas measuring device to solve the technical problem of the influence of the hammer effect in the gas measuring device in the prior art on the measurement accuracy.

[0006] To achieve the above-mentioned purpose, the technical solution adopted by the application is:

[0007] A pressure relief gas path structure is provided, comprising:

[0008] An inlet valve and a pressure relief valve are sequentially arranged on the gas path, one end of the inlet valve is connected to the gas path inlet, and the other end of the inlet valve is connected to the input end of the pressure relief valve;

[0009] The pressure relief valve also has a normally open output end and a normally closed output end, the normally closed output end is connected to a gas-using element, and the normally open output end is connected to the outside of the gas path;

[0010] After the gas enters the gas path through the gas path inlet, the gas passes through the inlet valve and the pressure relief valve in turn, and is discharged from the always open output end of the pressure relief valve; after a set time, the pressure relief valve switches to output the gas from the always closed output end to the gas using element, thereby ensuring that the gas using element receives stable and pulse-free gas flow, thereby ensuring the accuracy of the measurement and effectively avoiding error accumulation caused by gas hammer effect.

[0011] As a further improvement of the above technical solution:

[0012] Optionally, the pressure relief valve comprises a valve body and a valve core, the valve core is movably connected in the valve body, to switch the input end of the valve body to the always open output end, or to switch the input end of the valve body to the always closed output end. When the input end of the valve body is connected to the always open output end, it can discharge the large amplitude gas flow pulse generated in the initial ventilation period to the outside of the gas path. When the input end of the valve body is connected to the always closed output end, it can guide the stable gas flow to the gas using element.

[0013] Optionally, the number of always closed output ends of the pressure relief valve is multiple, and each of the always closed output ends is connected to a corresponding gas using element to simultaneously and stably supply gas to multiple gas using elements.

[0014] Optionally, the pressure relief valve is a three-way reversing valve. The input end of the three-way reversing valve is responsible for receiving the gas pressure from the upstream, and the other two channels of the three-way reversing valve are always open output end and always closed output end, respectively. The flow direction of the gas can be switched according to the control signal, thereby realizing accurate distribution and flow control of the gas.

[0015] Optionally, the inlet valve is a one-way inlet valve, which only allows gas to flow in from a certain direction, effectively preventing gas backflow or leakage, thereby ensuring the orderliness and controllability of gas flow.

[0016] The application also provides a gas measurement device comprising the above-mentioned pressure relief gas path structure, and therefore has the advantages of the pressure relief gas path structure in the above-mentioned embodiments.

[0017] The pressure relief gas path structure and the gas measurement device provided by the application have the following beneficial effects:

[0018] The pressure relief gas path structure provided by the application comprises an inlet valve and a pressure relief valve arranged in the gas path in sequence. One end of the inlet valve is connected to the gas path inlet, and the other end of the inlet valve is connected to the input end of the pressure relief valve.

[0019] The pressure relief valve also has a normally open output end and a normally closed output end; the normally open output end is connected to the outside of the gas circuit; the normally open output end plays a role in the initial aeration stage of the gas circuit, and it directly leads to the outside of the gas circuit, and is used to discharge the large flow pulse that may be generated in the initial aeration stage, thereby effectively reducing the impact of the flow pulse on subsequent elements, and also helps to guide the unstable flow state to the outside of the system, avoiding interference with the subsequent gas measurement or processing process.

[0020] On the other hand, the normally closed output end is connected to a gas-using element, such as a measurement unit. After the initial flow pulse is effectively discharged and a preset period of time has elapsed, the pressure relief valve switches to supply gas to the gas-using element through the normally closed output end, thereby ensuring that the gas-using element receives stable, pulse-free gas flow, thereby ensuring the accuracy of the measurement and effectively avoiding error accumulation caused by the gas hammer effect.

[0021] The gas measurement device provided by the present application includes the above-mentioned pressure relief gas circuit structure, and therefore also has the advantages of the above-mentioned pressure relief gas circuit structure. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.

[0023] Figure 1 A structural schematic diagram of the pressure relief gas circuit structure provided by the present application;

[0024] Figure 2 A structural schematic diagram of the pressure relief valve in the pressure relief gas circuit structure provided by the present application.

[0025] In the drawings, various reference signs represent:

[0026] 1, inlet valve; 2, pressure relief valve;

[0027] 21, input end; 22, normally open output end;

[0028] 23, normally closed output end; 24, valve body;

[0029] 25, valve core; 3, gas-using element. DETAILED DESCRIPTION

[0030] The embodiments of the present application are described below in detail, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the drawings are exemplary, and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0033] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be connected inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise specifically defined and limited, the first feature "above" or "below" the second feature can include the first and second features directly contacting, or the first and second features not directly contacting but contacting through another feature between them. Moreover, the first feature "above", "above" and "above" the second feature includes the first feature directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature includes the first feature directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0035] In addition, the technical solutions among various embodiments can be combined with each other, but it must be based on that a person skilled in the art can realize, when the combination of the technical solutions appears contradictory or cannot be realized, it should be considered that the combination of the technical solutions does not exist, and is also not within the scope of the present application.

[0036] In the following description, suffixes such as "circuit", "component", "assembly" or "unit" are used only for the convenience of description of the present application, and have no specific meaning in itself. Therefore, they can be used mixedly.

[0037] The present application will be described in further detail below with specific embodiments in conjunction with the accompanying drawings.

[0038] Gas measurement devices are widely used in environmental monitoring, industrial process control, medical health and other fields, for accurately measuring the concentration, flow rate and other key parameters of various gases. Such devices usually contain at least one reaction measurement unit designed to receive the gas sample to be measured, and convert or sense the characteristics of the gas through specific chemical reactions or physical processes, thereby realizing quantitative analysis of the gas.

[0039] However, in actual operation, especially in the initial stage when the gas sample is introduced into the measurement system, that is, at the moment when the inlet valve is opened, a phenomenon called "hammer effect" is often encountered. The hammer effect refers to that when the inlet valve is quickly opened, due to the sudden release of gas pressure in the pipeline or the rapid influx of external high-pressure gas, a strong gas flow pulse impacts the reaction measurement unit. This sudden change in gas pressure not only makes the measured gas flow into the measurement chamber at an extremely fast speed, but also may be accompanied by the generation of vortex and turbulent flow, seriously interfering with the uniform distribution and stable flow of the gas sample in the measurement chamber. More critically, this rapid gas flow often leads to rapid changes in gas concentration in the measurement chamber, making it difficult for the sensor or detector to capture stable and accurate signals within a short time, thereby greatly affecting the accuracy and repeatability of the measurement.

[0040] To solve the influence of the hammer effect on the measurement accuracy of the gas measurement device, as shown in Figure 1 and Figure 2 The present application provides a pressure relief gas path structure, which comprises an inlet valve 1 and a pressure relief valve 2 arranged in sequence on the gas path. One end of the inlet valve 1 is connected to the gas path inlet, and the other end of the inlet valve 1 is connected to the input end 21 of the pressure relief valve 2.

[0041] The pressure relief valve 2 also has a normally open output end 22 and a normally closed output end 23; the normally open output end 22 is directly connected to the outside of the gas circuit; the normally open output end 22 plays a role in the initial aeration stage of the gas circuit, and directly guides to the outside of the gas circuit, for discharging the large flow pulse that may be generated in the initial aeration stage, thereby effectively reducing the impact of the flow pulse on the subsequent components, and also helping to guide the unstable flow state to the outside of the system, avoiding interference with the subsequent gas measurement or processing process.

[0042] On the other hand, the normally closed output end 23 is connected to the gas using component 3, such as a measurement unit.

[0043] After the initial flow pulse is effectively discharged and a preset time period elapses, the pressure relief valve 2 switches to supply gas to the gas using component 3 through the normally closed output end 23, thereby ensuring that the gas using component 3 receives stable and pulse-free gas flow, thereby ensuring the accuracy of the measurement and effectively avoiding error accumulation caused by the gas hammer effect.

[0044] As shown in Figure 1 and Figure 2 , in one specific embodiment of the present application, the pressure relief valve 2 includes a valve body 24 and a valve core 25, the valve core 25 is movably connected in the valve body 24, to switch the input end 21 on the valve body 24 to be communicated with the normally open output end 22, or to switch the input end 21 on the valve body 24 to be communicated with the normally closed output end 23.

[0045] When the input end 21 on the valve body 24 is communicated with the normally open output end 22, the large flow pulse that may be generated in the initial aeration stage can be discharged to the outside of the gas circuit. When the input end 21 on the valve body 24 is communicated with the normally closed output end 23, stable gas flow can be communicated to the gas using component 3.

[0046] In one specific embodiment of the present application, the number of normally closed output ends 23 of the pressure relief valve 2 is multiple, and each normally closed output end 23 is respectively communicated to a corresponding gas using component 3, to simultaneously and stably supply gas to multiple gas using components 3.

[0047] As shown in Figure 1 and Figure 2 , in one specific embodiment of the present application, the pressure relief valve 2 is specifically a three-way directional control valve.

[0048] The input end 21 of the three-way directional control valve is responsible for receiving gas pressure from the upstream, and the other two channels of the three-way directional control valve are respectively the normally open output end 22 and the normally closed output end 23, which can switch the flow direction of the gas according to the control signal, thereby realizing accurate distribution and flow control of the gas.

[0049] In one specific embodiment of the present application, the intake valve 1 is specifically a one-way intake valve, which functions to only allow gas to flow in from a certain specific direction, effectively preventing gas backflow or leakage, thereby ensuring the orderliness and controllability of gas flow.

[0050] The present application provides a gas measuring device, which comprises the pressure relief gas path structure in the above-mentioned embodiments, and thus also has the advantages of the pressure relief gas path structure in the above-mentioned embodiments.

[0051] The above merely provides a preferred embodiment of the present application, but should not be used to limit the present application, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pressure relief gas path structure, characterized in that, include: An intake valve (1) and a pressure relief valve (2) are sequentially arranged on the air path. One end of the intake valve (1) is connected to the air inlet of the air path, and the other end of the intake valve (1) is connected to the input end (21) of the pressure relief valve (2). The pressure relief valve (2) also has a normally open output terminal (22) and a normally closed output terminal (23), the normally closed output terminal (23) being connected to the gas-using element (3); the normally open output terminal (22) being connected to the outside of the gas path; After the gas enters the gas path through the gas inlet, it passes through the gas inlet valve (1) and the pressure relief valve (2) in sequence, and is discharged from the normally open output terminal (22) of the pressure relief valve (2). After a set time, the pressure relief valve (2) switches to output gas from the normally closed output terminal (23) to the gas-using element (3).

2. The pressure relief air passage structure as described in claim 1, characterized in that, The pressure relief valve (2) includes a valve body (24) and a valve core (25). The valve core (25) is movably connected inside the valve body (24) to switch the input end (21) on the valve body (24) to be connected to the normally open output end (22), or to switch the input end (21) on the valve body (24) to be connected to the normally closed output end (23).

3. The pressure relief air passage structure as described in claim 2, characterized in that, The pressure relief valve (2) has multiple normally closed output terminals (23), and each normally closed output terminal (23) is connected to a corresponding gas-using element (3).

4. The pressure relief air passage structure as described in claim 1, characterized in that, The pressure relief valve (2) is a three-way directional valve.

5. The pressure relief air passage structure as described in claim 1, characterized in that, The intake valve (1) is a one-way intake valve.

6. A gas measuring device, characterized in that, Includes the pressure relief air passage structure as described in any one of claims 1 to 5.

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