CN219871379U - Bypass purging type multi-path sample injection device with bypass flow control and analyzer - Google Patents

Abstract

The utility model provides a take bypass to sweep formula multichannel sampling device and analyzer of bypass flow control, every sample flow path in this multichannel sampling device is including the tee bend module that is connected with bypass and main road, and bypass flow controller is installed to this bypass, and main road is connected with and sweeps gas circuit and sample inlet channel through the tee bend component. The sample air inlet path is connected with a pressure stabilizing valve; the bypass flow controllers are selected from a float flowmeter, a steady flow valve, a mass flow controller and a pressure controller, and a bus is connected to the downstream side of each bypass flow controller. Two adjacent sample introduction flow paths may be connected as a set of sample introduction flow paths via a sample selection valve for selecting sample introduction channels. The automatic transmission is characterized in that a relay switch type interlocking circuit is further arranged, a band selection switch is arranged on the front panel, and when the band selection switch is manually selected to an automatic gear, manual control fails and automatic control is triggered. Therefore, the number of the sample injection paths can be infinitely expanded, the control mode is compatible with manual and automatic control, and is compatible with various external input signal control.

Description

Bypass purging type multi-path sample injection device with bypass flow control and analyzer

Technical Field

The utility model relates to the technical field of gas detection and analysis, in particular to a multi-mode control and bypass purging type multi-path sample injection device with bypass flow control and an analyzer with the multi-path sample injection device.

Background

The existing multi-path sample injection device is mainly used for main path sample injection, namely, sample gas directly enters an analysis instrument after being selected and flow rate set by a control system. In the sample injection mode, due to the influence of the flow control element, the tightness has certain defects, and the problems of pollution and the like of pure sample gas can be caused, so that certain influence is caused on analysis results, and the analyzed data are inaccurate. In addition, in terms of control, the existing products on the market are generally manually controlled or automatically controlled, which causes limitations in use, and the user cannot operate separately from the analysis apparatus or can not communicate with external signals to perform automatic control, so that a mode of combining manual control with automatic control is also required.

Disclosure of Invention

In order to solve the above problems, the present utility model aims to provide a multi-mode control and bypass purge type multi-path sample injection device with bypass flow control and an analyzer with the multi-path sample injection device.

According to an aspect of the present utility model, there is provided a bypass purge type multi-path sampling apparatus with bypass flow control, wherein each sampling flow path includes a three-way module connected with a bypass, which is mounted with a bypass flow controller for controlling a flow of gas introduced into the bypass, and a main path, which is connected with a purge gas path and a sample gas inlet path via three-way members.

Preferably, a pressure stabilizing valve is connected to the sample air inlet path; and/or the bypass flow controller is selected from the group consisting of a float flow meter, a flow stabilizer valve, a mass flow controller, a pressure controller.

Preferably, a relay switch type interlock circuit is provided, and a band selection switch is mounted on the front panel, and when the band selection switch is manually selected to an automatic gear, manual control is disabled, and automatic control is triggered.

Preferably, two adjacent sample injection flow paths are connected as a set of sample injection flow paths via a sample selection valve for selecting sample injection channels.

Preferably, the device comprises a plurality of groups of sample injection flow paths or further comprises one or more independent sample injection flow paths; and/or the sample selection valve is a diaphragm valve.

Preferably, each sample injection flow path is connected with an electromagnetic valve, and the sample selection valve controls the action of the cylinder through the on-off of the electromagnetic valve.

Preferably, a bus is connected to the downstream side of each bypass flow controller.

Preferably, a plurality of separate sample injection flow paths are included.

Preferably, an air barrier is connected between the three-way member and the diaphragm valve; and/or an air resistance piece is connected to the purging air path.

According to another aspect of the present utility model, there is also provided an analyzer comprising the bypass purge multiplex sampling device with bypass flow control as described in any one of the above.

According to the bypass purging sample injection method, the bypass purging sample injection is adopted, namely, after the sample gas is transmitted from the gas source and before the sample gas enters the analysis instrument, the custom tee joint is used, the bypass outlet is controlled by the flowmeter, the main path flow is changed by changing the bypass flow, the sample gas is further controlled to enter the rear end analysis instrument by the bypass purging gas for air intake and evacuation of the main path gas, and the main path gas which is not controlled enters the rear end analysis instrument for analysis, so that no leakage is caused to the greatest extent in the sample injection process, and the data effectiveness is guaranteed to the greatest extent.

On the other hand, according to the control design of the utility model, a relay interlocking circuit is used, a band selection switch is used, a control system can select manual or automatic control, namely the band selection switch is used in manual control, and a cylinder controlled by an electromagnetic valve is switched every time one gear is selected by rotating the band selection switch so as to control the switching of a sample injection channel; when the automatic gear is selected, the manual control fails, the automatic control is triggered, and the automatic gear can be independently controlled through an external direct current 5-12V signal or controlled by using a communication protocol, so that the automatic gear can be compatible with a manual mode and an automatic mode, and the application range is greatly improved.

Drawings

Fig. 1 shows a schematic structural diagram of a multi-mode control and bypass purge type multi-sample injection device with bypass flow control according to an embodiment of the present utility model.

Detailed Description

Exemplary embodiments of the present utility model are described in detail below with reference to the attached drawings. The exemplary embodiments described below and illustrated in the drawings are intended to teach the principles of the present utility model to enable one skilled in the art to make and use the present utility model in a number of different environments and for a number of different applications. The scope of the utility model is therefore defined by the appended claims, and the exemplary embodiments are not intended, and should not be considered, as limiting the scope of the utility model. Moreover, for ease of description, the various parts shown in the figures are for ease of description and simplicity of description only, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the utility model. The terms "first," "second," "I," and the like in the description and in the claims of the utility model and in the drawings, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

The multi-path sample injection device shown in fig. 1 shows a six-path sample injection structure, but is not limited to this, and the number of sample paths can be reduced or infinitely extended according to the needs, for example, the sample inlets 7, 8 and 9 … … are added on the basis of the sixth sample inlet 6 of the first sample inlet 1 and the second sample inlet 2 … ….

In the following, a group of two adjacent sample introduction channels including the first sample inlet 1 and the second sample inlet 2 is described as an example, and other groups may have similar arrangements. One end of each sample inlet is respectively connected with a sample gas cylinder serving as a sample gas source or a sample gas cylinder of a generating device, and the sample gas source uses a pressure reducing valve to control the outlet pressure; the pipeline of the other end is respectively connected with a tee joint module I11 and a tee joint module II 12, and each tee joint module is a tee joint with smaller customized dead volume.

One end of the three-way module I11 and one end of the three-way module II 12 are respectively connected with a first bypass flow controller 21 and a second bypass flow controller 22, and each bypass flow controller can be all flow-related control elements, such as a float flowmeter, a mass flow controller, a pressure controller and the like, so that the flowmeter and a steady flow valve of the control elements can be positioned on a front panel of the instrument to be conveniently controlled as required. The downstream side of each bypass flow controller is connected to a bus bar 10.

Taking the gas supplied from the first sample inlet 1 as an example, on the one hand, the gas from the three-way module i 11 enters the bypass 20, and after the flow control by the bypass flow controller 21, the bypass exhaust gas is collected in the bus 10 until being discharged to the exhaust pipe and discharged from the bypass gas outlet 20.

On the other hand, the gas from the three-way module i 11 enters the main path 30 as a sample gas, is supplied to the sample selection valve 31, passes through the air resistor 35, and then passes through the three-way member 36, one path forms the purge gas path 32, so that the leakage of the sample selection valve 31 can be compensated by using the gas in the path, the other path is a sample gas inlet path, the pressure stabilizing valve 33 is connected to define the gas inlet side pressure, and the rear end of the pressure stabilizing valve 33 is connected with the electromagnetic valve 34 so as to control the sample selection valve 31 to select the sample injection passage for use.

Here, for example, a diaphragm valve may be used as the sample selector valve 31, and thus the main passage intake end of the three-way member 36 may be connected to a pneumatic diaphragm valve control, and it is needless to say that the valve is not limited to a pneumatic valve, and may be an electric valve, a mechanical valve, or the like. The diaphragm valve is opened and closed through the electromagnetic valve 34 so as to control the action of a cylinder (not shown), so that the purpose of sample switching can be achieved, and the sample can be controlled by the sample selection valve 31 to enter an analysis instrument for use.

As described above, according to the present utility model, the flow rate of the main path 30 is controlled by varying the flow rate of the bypass path 20 in order to allow the sample gas to directly enter the analyzer without passing through the control unit (flow meter), minimize leakage, and minimize the level of contamination, thereby providing ultra-high purity performance.

Furthermore, according to the utility model, the sample injection part can be connected with the analyzer and the sample gas source by using stainless steel or polytetrafluoroethylene connectors, the sample injection device is taken as an example, but the number of sample injection paths can be infinitely expanded, the internal design is compact, and welded process connecting pipelines can be used, wherein the pipelines can be made of materials such as stainless steel, PTFE, PKKK and the like, and in particular, different types of materials or coatings can be used according to the airflow components and the application; the pipeline size is determined according to the use condition.

The circuit control mode of the multipath sample injection device can use a relay switch type interlocking circuit, and a signal switching indicator lamp, a power supply indicator lamp and a band selection switch are arranged on the front panel. The control system may be made to select manual or automatic control using a band selection switch. The manual control is to use a band selection switch, and the switching of the sample injection channel is controlled by switching the air cylinder controlled by the electromagnetic valve by rotating the band selection switch every time one gear is selected; when the automatic gear is selected, the manual control is disabled, and the automatic control is triggered, and the automatic control can be independently controlled through an external direct current 5-12V signal or controlled by using a communication protocol.

As described above, the multi-way sampling apparatus according to the present utility model can provide a reliable and compact solution for the gas industry, and can provide clean gas for any process gas chromatograph and on-line process analyzer. The design is compact and small, the pipeline is connected with a small dead volume, and the pipeline has the advantages of welding and pipelines made of materials with small adsorptivity, so that the pollution level can be reduced to the minimum. By mounting its bypass purge flow meter and valve on the front panel of each flow, the apparatus provides a standard quick purge system required by the industry, which can ensure excellent response time of the quick purge and analysis equipment. This configuration of sample selector valve 31 and flow meter provides a sample bypass for the unselected flow, allowing each gas to be permanently purged. All unselected streams can then be ready for analysis without additional delay for purging. The sample selector valve 31 used can avoid outside or inside leakage, thereby providing ultra-high purity performance. Depending on the gas composition and application, different types of materials or coatings may be used to ensure optimal compatibility with the materials and to maintain optimal response times of the analytical instrument. The number of sample paths can be infinitely expanded, and the configuration is more convenient for users. The better circuit control system can be compatible with manual and automatic modes, greatly improves the application range, can analyze the random switching of multiple paths of samples by using one analyzer, and provides convenience and cost saving for customers. Not only gaseous analytical instruments, but also liquid and solid analytical instruments are applicable. Thus, according to the present utility model, there is also provided an analyzer to which the above-described multiplex sampling device is connected.

In the description of the present utility model, a tee is a member comprising at least three passages. An air resistance piece can also be connected to the purge gas path. Multiple sets of sample flow paths are shown, but are not limited thereto and may include one or more separate sample flow paths (i.e., not connected to adjacent sample flow paths via sample selection valves). That is, although the sample selector valve 31 is described as a group of two-way sample introduction devices of the first sample inlet 1 and the second sample inlet 2, a plurality of separate flow paths may be provided without the sample selector valve 31, and bypass flow control and bypass purge of the main path may be realized by three-way valves. The meaning of "a plurality of" is two or more, unless specifically defined otherwise. Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances. While the utility model has been described with reference to various specific embodiments, it should be understood that numerous changes could be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the utility model not be limited to the described embodiments, but that it have the full scope defined by the language of the following claims.

Claims (10)

1. A bypass purging type multi-path sample injection device with bypass flow control is characterized in that each sample injection flow path comprises a three-way module connected with a bypass and a main path, the bypass is provided with a bypass flow controller for controlling the flow of gas introduced into the bypass, and the main path is connected with a purging gas path and a sample gas inlet path through three-way components.

2. The bypass purge type multi-way sample injection device with bypass flow control according to claim 1, wherein a pressure stabilizing valve is connected to a sample air inlet path; and/or the bypass flow controller is selected from a float flow meter, a flow stabilizing valve, a mass flow controller, a pressure controller.

3. The bypass purge type multi-sample injection device with bypass flow control according to claim 1, wherein a relay switch type interlock circuit is provided, and a band selection switch is installed on a front panel, and when the band selection switch is manually selected to an automatic gear, manual control is disabled and automatic control is triggered.

4. A bypass purge type multi-path sampling device with bypass flow control according to any one of claims 1 to 3, wherein two adjacent sampling paths are connected as a set of sampling paths via a sample selection valve for selecting sampling paths.

5. The bypass purge type multi-path sample injection device with bypass flow control according to claim 4, wherein the bypass purge type multi-path sample injection device comprises a plurality of groups of sample injection flow paths or further comprises one or more independent sample injection flow paths; and/or the sample selection valve is a diaphragm valve.

6. The bypass purge type multi-path sample injection device with bypass flow control according to claim 4, wherein an electromagnetic valve is connected to each sample injection flow path, and the sample selection valve controls the cylinder action by switching on and off the electromagnetic valve.

7. The bypass purge type multiplex sampling device with bypass flow control according to any one of claims 1 to 3, wherein a bus is connected to a downstream side of each bypass flow controller.

8. The bypass purge multiplex sample injection device with bypass flow control according to claim 4, comprising a plurality of separate sample injection flow paths.

9. The bypass purge type multi-way sample injection device with bypass flow control according to claim 5, wherein an air barrier is connected between the three-way member and the diaphragm valve; and/or an air resistance piece is connected to the purging air path.

10. An analyser comprising a bypass purge multiplex sampling device with bypass flow control as claimed in any one of claims 1 to 9.