Flow-controllable flue gas jet device

Abstract

The utility model discloses a flue gas jet device with controllable flow, which relates to the technical field of smoke detection and comprises a flue gas sampler connected with a gas inlet of a jet pump in a cabinet through a connecting pipeline, and a frequency conversion fan electrically connected with a frequency converter is arranged in the cabinet. An air outlet and an air inlet of the frequency conversion fan are respectively connected with one air inlet of the air pipe and a clean air source, an air outlet of the jet pump is connected with the other air inlet of the air pipe, the air pipe is further provided with a smoke dust concentration measuring instrument, the frequency conversion fan is connected with the air inlet of the air pipe through an air conveying pipeline, and the air conveying pipeline is connected with the jet pump. And a spiral flow channel is arranged in the air pipe. According to the device, the spiral flow channel is additionally arranged, sampled flue gas ejected from the jet pump nozzle is primarily mixed with clean gas entering the gas pipe, and then moves along the spiral flow channel to be secondarily mixed, so that the mixing effect is better, that is, the gas is more uniformly mixed, and the detection precision of the smoke dust concentration measuring instrument can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of smoke detection, in particular to a flow-controllable smoke jet device. Background Art

[0002] Currently, most domestic pollution sources have achieved "ultra-low" emissions, meeting ultra-low emission standards, with dust concentrations below 5 mg / m³. The current mainstream dust concentration measurement principle uses laser forward scattering, requiring flue gas to be drawn into a dust concentration measurement device for measurement. The negative pressure generated by a jet pump draws the sample gas into the flue gas sampler. The clean gas (delivered by a variable frequency blower) and the sampled flue gas (delivered by the negative pressure generated by the jet pump) are rapidly mixed and diluted, heated to a dry state, and then passed into a dust concentration meter for dust concentration measurement. This significantly improves measurement accuracy while protecting the instrument's optical lenses from contamination by the original flue gas. In existing flow-controlled flue gas jet devices, the clean gas flow rate and velocity can be adjusted by a frequency converter, which controls the speed of the variable frequency blower.

[0003] In a flow-controllable flue gas jet device, the uniform mixing effect of the clean gas and the sampled flue gas has a great influence on the subsequent smoke dust concentration detection accuracy. The more uniform the mixing is, the higher the accuracy of the data value measured after the detection. However, the mixing effect of the existing flue gas jet device is difficult to meet the needs of high-precision detection. Therefore, the present application provides a flow-controllable flue gas jet device to meet the needs. Utility Model Content

[0004] The purpose of this application is to provide a flow-controllable smoke jet device to solve the technical problem that existing flow-controllable smoke jet devices are difficult to meet high-precision detection requirements.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: a flow-controllable smoke jet device, comprising a smoke sampler connected to the air inlet of a jet pump inside a cabinet through a connecting pipe, a variable frequency fan electrically connected to the frequency converter is provided inside the cabinet, the air outlet and air inlet of the variable frequency fan are respectively connected to one of the air inlets of the trachea and the clean air source, the air outlet of the jet pump is connected to the other air inlet of the trachea, a smoke concentration measuring instrument is also installed on the trachea, the variable frequency fan is connected to the air inlet of the trachea through an air supply pipe, a spiral flow channel is provided in the trachea, which is used to make the gas in the trachea move in a spiral path and mix, the air outlet end of the jet pump is located in the inner cavity of the trachea, and the airflow ejection direction of the jet pump is consistent with the exhaust direction of the gas supply pipe.

[0006] Preferably, the outer surface of the spiral flow channel and the inner surface of the air pipe are both configured as smooth surfaces.

[0007] Preferably, pits are provided on the surface of the spiral flow channel extending along the airflow direction.

[0008] Preferably, the pits are arranged in a honeycomb structure.

[0009] Preferably, the connecting pipe is connected to the air inlet end of the jet pump through a chuck-to-pagoda joint.

[0010] Preferably, an electric ball valve capable of adjusting the intake air flow rate is installed on the intake end of the jet pump.

[0011] In summary, the technical effects and advantages of the utility model are:

[0012] The utility model has a reasonable structure. The device is equipped with a spiral flow channel. The sampled flue gas ejected from the nozzle of the jet pump is initially mixed with the clean gas entering the trachea. The gas then moves along the spiral flow channel for secondary mixing. This improves the mixing effect, i.e., the gas is mixed more evenly. This can improve the detection accuracy of the smoke concentration measuring instrument, thus meeting the demand for high-precision detection.

[0013] In the present invention, pits are provided on the surface of the spiral flow channel extending in the direction of the airflow, which can change the flow direction and flow velocity distribution of the airflow, making the airflow more stable and uniform. The shape of the pits can make the airflow form smaller vortices in it, reducing the occurrence of turbulence and thus reducing the airflow resistance.

[0014] In the present invention, the pits are arranged in a honeycomb structure, and the shape thereof can effectively suppress the generation of turbulence and reduce gas resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 This is a schematic diagram of the structure of the utility model;

[0017] Figure 2 This is a schematic diagram of the partially enlarged structure of the practical jet system;

[0018] Figure 3 For this utility model Figure 2 Schematic diagram of the partial cross-sectional structure of the trachea.

[0019] In the figure: 1. Flue gas sampler; 2. Cabinet; 3. Chuck to pagoda connector; 4. Electric ball valve; 5. Jet pump; 6. Connecting pipe; 7. Gas pipeline; 8. Variable frequency fan; 9. Smoke concentration meter; 10. Pit; 11. Spiral flow channel; 12. Frequency converter; 13. Air pipe. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] Example: Reference Figure 1-3 A flow-controllable flue gas jet device shown includes a flue gas sampler 1 connected to the air inlet of a jet pump 5 inside a cabinet 2 through a connecting pipe 6. A variable frequency fan 8 electrically connected to a frequency converter 12 is provided inside the cabinet 2. The air outlet and air inlet of the variable frequency fan 8 are respectively connected to one of the air inlets of an air pipe 13 and a clean air source. The air outlet of the jet pump 5 is connected to the other air inlet of the air pipe 13. A smoke concentration measuring instrument 9 is also installed on the air pipe 13. The variable frequency fan 8 is connected to the air inlet of the air pipe 13 through an air supply pipe 7. A spiral flow channel 11 is provided in the air pipe 13 for making the gas in the air pipe 13 move in a spiral path and mix. The air outlet end of the jet pump 5 is located in the inner cavity of the air pipe 13, and the air flow ejection direction of the jet pump 5 is consistent with the exhaust direction of the air supply pipe 7.

[0022] The sampled flue gas ejected from the nozzle of the jet pump 5 is initially mixed with the clean gas entering the trachea 13, and then moves along the spiral flow channel 11 for secondary mixing. The mixing effect is better, that is, the gas is mixed more evenly, which can improve the detection accuracy of the smoke concentration measuring instrument, that is, meet its high-precision detection requirements.

[0023] It should be noted that, first, the spiral flow channel 11 can be a unidirectional spiral flow channel or a counter-rotating double-helix flow channel (refer to the counter-rotating double-helix flow channel mixer), and the mixing effect of the counter-rotating double-helix flow channel is better than that of the unidirectional spiral flow channel; second, even when the jet pump 5 is running at low power (i.e., the flue gas flow rate is small and the power consumption is low), the gas can be mixed more evenly through secondary mixing.

[0024] As a preferred implementation in this embodiment, Figure 3 As shown, the outer surface of the spiral flow channel 11 and the inner surface of the air pipe 13 are both set to smooth surfaces, which can reduce the friction resistance of the mixed gas and facilitate the rapid flow of the gas.

[0025] As a preferred implementation in this embodiment, Figure 3 As shown, a pit 10 is provided on the surface of the spiral flow channel 11 extending along the flow direction of the airflow, which can change the flow direction and flow velocity distribution of the airflow, making the airflow flow more stable and uniform, and the shape of the pit can make the airflow form smaller vortices therein, reducing the occurrence of turbulence, thereby reducing the airflow resistance.

[0026] As a preferred implementation in this embodiment, Figure 3 As shown, the pit 10 is configured as a honeycomb structure, the shape of which can effectively suppress the generation of turbulence and reduce gas resistance.

[0027] As a preferred implementation in this embodiment, Figure 2 As shown, the connecting pipe 6 is connected to the air inlet end of the jet pump 5 through the chuck-to-pagoda joint 3, which facilitates the disassembly and assembly of the connecting pipe 7 and the jet pump 5.

[0028] As a preferred implementation in this embodiment, Figure 2 As shown, an electric ball valve 4 with adjustable intake air flow rate is installed on the intake end of the jet pump 5. The electric valve 4 can control the amount of gas entering the jet pump 5, thereby controlling the amount of flue gas sampled during gas mixing.

[0029] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A flow-controllable smoke jet device, comprising a smoke sampler (1) connected to the air inlet of a jet pump (5) inside a cabinet (2) through a connecting pipe (6), a variable frequency fan (8) electrically connected to a frequency converter (12) being provided inside the cabinet (2), an air outlet and an air inlet of the variable frequency fan (8) being connected to one of the air inlets of an air pipe (13) and a clean air source, respectively, an air outlet of the jet pump (5) being connected to the other air inlet of the air pipe (13), and a smoke concentration measuring instrument (9) being further installed on the air pipe (13), characterized in that: The variable frequency fan (8) is connected to the air inlet of the air pipe (13) through the air supply pipeline (7). A spiral flow channel (11) is provided in the air pipe (13) for mixing the gas in the air pipe (13) in a spiral path. The air outlet end of the jet pump (5) is located in the inner cavity of the air pipe (13), and the air flow ejection direction of the jet pump (5) is consistent with the exhaust direction of the air supply pipeline (7).

2. A flow-controllable smoke jet device according to claim 1, characterized in that: The outer surface of the spiral flow channel (11) and the inner surface of the air pipe (13) are both configured as smooth surfaces.

3. The flow-controllable smoke jet device according to claim 1, characterized in that: A concave pit (10) is provided on a surface of the spiral flow channel (11) extending along the airflow direction.

4. The flow-controllable smoke jet device according to claim 3, characterized in that: The pit (10) is configured as a honeycomb structure.

5. The flow-controllable smoke jet device according to claim 1, characterized in that: The connecting pipe (6) is connected to the air inlet end of the jet pump (5) via a chuck-to-pagoda joint (3).

6. The flow-controllable smoke jet device according to claim 1, characterized in that: An electric ball valve (4) capable of adjusting the intake air flow rate is installed on the intake end of the jet pump (5).

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