CN210584521U

CN210584521U - Air distribution device

Info

Publication number: CN210584521U
Application number: CN201920206767.8U
Authority: CN
Inventors: 邓嘉辉; 王海东; 孙悦欣; 马乔; 许燕冰
Original assignee: Focused Photonics Hangzhou Inc; Hangzhou Puyu Technology Development Co Ltd
Current assignee: Focused Photonics Hangzhou Inc; Hangzhou Puyu Technology Development Co Ltd
Priority date: 2019-02-18
Filing date: 2019-02-18
Publication date: 2020-05-22
Anticipated expiration: 2029-02-18

Abstract

The utility model provides a distribution device, include: a switching module having a first port, a second port, a third port, and a fourth port; when switching, the first port is selectively communicated with the second port and the fourth port, and the fourth port is selectively communicated with the third port; the second communicating pipe is used for communicating the dilution gas; an extraction module in communication with the first port; the variable volume container is detachably communicated with the fourth port; and the detector is communicated with the third port and is used for detecting the content of the gas to be detected in the variable volume container. The utility model has the advantages of real-time automatic preparation and the like.

Description

Air distribution device

Technical Field

The utility model relates to a gas analysis, in particular to distributing device.

Background

In the process of gas analysis, a series of standard substance gases with different concentrations are often used to draw a calibration curve of the instrument; in the process of sample gas detection, due to the limitation of a calibration curve range or an instrument detection range, gas with larger sample concentration is generally not directly analyzed, but clean zero gas is used for diluting the sample gas, so that the concentration of substances in the sample gas is within the detection range of the instrument, and the obtained quantitative result is accurate and credible. Therefore, during the analysis and inspection of gases, both standard gases of different concentrations are required, as well as sample gases of a suitable concentration range. Since different series of concentrations of standard gas and sample gas are required, the gas dispensing method and apparatus will be generated accordingly. Currently, techniques for diluting gases, especially Volatile Organic Compounds (VOCs), can be roughly classified into two types, namely dynamic dilution and static dilution:

the dynamic dilution method is a process of mixing standard gas with higher concentration and zero gas according to a certain proportion to produce a certain proportion of dilution effect and outputting the diluted standard substance gas in a dynamic balance state. The device manufactured according to this principle is called a gas dynamic dilution apparatus. The dynamic dilution method is a gas preparation technology which is widely used at present. Nevertheless, the dynamic dilution method still has some disadvantages:

(1) the dynamic dilution method uses a dynamic equilibrium mode to prepare gas, so that the mixing and dynamic equilibrium effects must be generated by certain power output no matter whether the gas is standard gas or zero gas. In this case, the zero gas can be pressurized using an air compressor, whereas the standard gas must be obtained using a steel cylinder gas containing pressure. However, the purchase of standard steel cylinder gas, especially volatile organic standard gas, not only has higher purchase cost and longer period, but also the domestic related standard gas preparation technology is not mature enough, and the purchase period and cost of foreign standard gas are high.

(2) The dynamic dilution method needs gas with pressure for dynamic preparation, is mainly used for preparing standard gas and is less used for preparing sample gas. If the sample gas is pressurized, cross contamination of the pressurizing device and the sample gas is often caused. The dynamic dilution method is therefore generally not suitable for diluting the sample gas.

(3) The dynamic dilution method is a gas preparation method with power, so that the generated gas has pressure, technicians must convert the real concentration of the generated gas according to the pressure, and if the generated gas is subjected to diversion treatment to reduce the pressure, waste and tail gas of standard gas are caused, and environmental pollution is caused.

The static dilution method is a method for preparing gas with target concentration by uniformly mixing a liquid standard substance or gas standard gas with zero gas or standard gas with certain concentration in a fixed volume state. The device manufactured according to this principle is called a gas static diluter. Compare the developments appearance that dilutes, static dilution appearance acquisition cost is lower relatively, and the user can purchase corresponding standard solution as required, pours into static dilution bottle into according to the quality of certain substance into, when gaseous complete volatilization back, then prepares into standard gas, and easy operation is convenient, need not to purchase costly standard steel bottle gas. The gas after static dilution is generally stored under normal pressure, and may be stored under pressure. The static dilution method can be used for preparing standard gas and also can be used for preparing sample gas. However, the static dilution method is not widely used as the dynamic dilution method, and the main disadvantages are that:

(1) the amount of gas used is limited due to the use of a static dilution bottle of fixed volume for the gas preparation. According TO the relevant standard regulation (EPA TO-15), when the gas in the static dilution cylinder is prepared at atmospheric pressure, the user can only take 1% of the gas volume in the cylinder, otherwise the cylinder will form a large vacuum and the gas sample concentration will change, and the gas concentration taken next cannot be estimated.

(2) If a pressurized storage gas is used, although the amount of the gas used can be increased, a soda can having a high pressure resistance and having an inner surface treated must be purchased for storage. The purchase cost is also high.

The gas prepared by the dynamic dilution method must be prepared by adopting positive pressure gas, is mostly used for diluting standard gas, and has higher preparation cost. The volume of the container prepared by the static dilution method is fixed, and all the gas cannot be completely used. Thus, current gas formulation techniques suffer from certain deficiencies.

SUMMERY OF THE UTILITY MODEL

In order to solve the deficiencies in the prior art schemes, the utility model provides an automatic, real-time adjustment's distribution device.

The utility model aims at realizing through the following technical scheme:

a gas distribution apparatus, comprising:

a switching module having a first port, a second port, a third port, and a fourth port; when switching, the first port is selectively communicated with the second port and the fourth port, and the fourth port is selectively communicated with the third port; the second communicating pipe is used for communicating the dilution gas;

an extraction module in communication with the first port;

the variable volume container is detachably communicated with the fourth port;

and the detector is communicated with the third port and is used for detecting the content of the gas to be detected in the variable volume container.

Compared with the prior art, the utility model discloses the beneficial effect who has does:

1. the operation is carried out under normal pressure, and the conversion of pressure is not needed to be increased in the calculation of the concentration of the sample;

2. the gas preparation proportion, or the mixing proportion of the two gases can be automatically calculated and automatically adjusted, or the proportion can be fixed, and the mixing or preparation of the gases can be automatically completed;

3. the prepared gas solvent is changeable, so that the phenomenon that gas cannot be taken out due to negative pressure is avoided; all gases can be completely taken out and used, and no tail gas or sample waste is generated;

4. the flow paths through which the gas passes are subjected to inerting treatment, and an electromagnetic valve is not adopted, so that sample pollution or cross pollution of the sample and equipment can be prevented;

5. the device can be used for preparing standard substance gas and sample gas.

6. The source of the dilution gas of the device is not limited to the pressure steel cylinder gas, and the gas can be obtained in other modes, and the collected pollutant gas can be used as a gas source.

Drawings

The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:

fig. 1 is a schematic structural view of a gas distribution device according to embodiment 1 of the present invention;

fig. 2 is another schematic configuration diagram of a gas distribution device according to embodiment 2 of the present invention.

Detailed Description

Fig. 1-2 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.

Example 1:

fig. 1 schematically shows a schematic structural diagram of a gas distribution apparatus according to an embodiment of the present invention, and as shown in fig. 1, the gas distribution apparatus includes:

a switching module 4 having a first port, a second port, a third port and a fourth port; when switching, the first port is selectively communicated with the second port and the fourth port, and the fourth port is selectively communicated with the third port; the second communicating pipe is used for communicating the dilution gas;

an extraction module 1, which is communicated with the first port; when the first port is communicated with the second port, part of the diluent gas is pumped into the extraction module;

a variable volume container 7 detachably communicated with the fourth port; through switching, gas in the variable volume container enters the detector, or diluent gas in the extraction module enters the variable volume container;

and the detector 6 is communicated with the third port and is used for detecting the content of the gas to be detected in the variable-volume container.

The working mode of the gas distribution device is as follows:

the standard gas or sample gas is arranged in the variable volume container, as shown in figure 1, the fourth port is communicated with the third port by switching, the gas in the variable volume container enters the detector, and the first port is communicated with the second port;

the detector analyzes the transmitted gas to obtain the content of standard gas or sample gas;

determining a dilution ratio according to the content, thereby determining the volume of the dilution gas; then, the diluent gas with the determined volume enters the extraction module;

as shown in fig. 2, the first port and the fourth port are communicated by switching, and the extraction module injects the extracted dilution gas into the variable volume container, so as to achieve the dilution ratio.

Example 2:

according to the utility model discloses embodiment 1's application example.

In the application example, the pipeline between the diluent gas and the second port and the pipeline between the detector and the third port are subjected to inerting treatment; the air extraction module adopts an injection pump with a quantitative function; the switching module is a two-position four-way valve; the detector is a chromatograph-mass spectrometer.

Claims

1. A kind of air distributing device, characterized by: the air distribution device comprises:

an extraction module in communication with the first port;

the variable volume container is detachably communicated with the fourth port;

2. The air distribution apparatus of claim 1, wherein: the extraction module has a quantification function.

3. The air distribution apparatus of claim 1, wherein: the second port is in selective communication with the third port.

4. The air distribution apparatus of claim 1, wherein: the extraction module is a syringe pump.

5. The air distribution apparatus of claim 1, wherein: the switching module is a two-position four-way valve.

6. The air distribution apparatus of claim 1, wherein: the detector is a chromatograph-mass spectrometer.