Device for measuring dust through dilution method

Abstract

The utility model discloses a dust measuring device adopting a dilution method. The dust measuring device comprises a sampling unit, a dilution unit and a measuring unit, according to the utility model, the dilution unit is used for diluting the sample gas, specifically, the jet pump and the mass flow meter are used for accurately controlling the flow of the sample gas and the dilution gas, so that the effective dilution of the sample gas is realized, the dust concentration is reduced, the pollution of the quartz glass tube in the measuring cavity seat can be effectively reduced, and the accuracy of laser scattering measurement is improved; the accuracy of measured data is improved, and the maintenance period of equipment can be shortened; the design of the heating probe rod and the heat preservation box can reduce the influence of environment temperature on measurement, and the environmental adaptability of the device is improved; due to the application of the electric proportional valve and the differential pressure detector, accurate control and monitoring of flow are achieved, and the intelligent level of the device is improved; the device is compact in overall design, reasonable in component layout and convenient to install and maintain.

Description

TECHNICAL FIELD

[0001] The utility model relates to dust measurement technical field especially relates to a dilution method dust measuring device. BACKGROUND

[0002] Dilution method dust measuring device is widely used in environmental monitoring and industrial control. At present, the dust measuring instrument of the extraction type light scattering method on the market is susceptible to high concentration dust in the process of sampling and measuring when used in high concentration measuring environment, which leads to the pollution of the measuring chamber and the deviation of the measurement results, and cannot provide reliable data support for subsequent numerical calculation.

[0003] As Figure 2 As shown in the prior art, the device is fixed on the measuring point by the mounting flange, when the gas source enters the back end of the jet pump after being adjusted by the electric proportional valve, the negative pressure environment formed by the jet pump makes the sample gas enter from the sampling pipe, pass through the measuring connecting seat and reach the quartz glass tube installed in the measuring cavity seat; at the same time, the laser emitter penetrates into the quartz glass tube through the sealing seat, the scattered light generated by the dust in the sample gas is received by the light signal receiver, the light signal receiver converts the received laser intensity change into an electric signal for subsequent processing, calculates the dust concentration in the sample gas, and obtains the measurement value; after the measurement is completed, the sample gas is discharged through the cavity connecting seat, the venturi seat, the jet pump and the gas outlet seat.

[0004] The above-mentioned conventional device needs to pass through the quartz glass tube of the measuring signal for measurement, and due to the lack of effective dilution mechanism, the dust carried in the sample gas is easy to adhere to the quartz glass tube, but the laser beam is susceptible to the interference of high concentration dust, which affects the light transmittance and causes adverse effects on the signal reception, resulting in the deviation of the measurement value, and the device needs to be improved. SUMMARY

[0005] This section aims to outline some aspects of the embodiments of the utility model and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the abstract of the specification and the utility model name to avoid obscuring the purpose of this section, the abstract of the specification and the utility model name, and such simplifications or omissions cannot be used to limit the scope of the utility model.

[0006] Therefore, in order to solve the above technical problems, the utility model provides the following technical scheme: a dilution method dust measuring device, comprising a sampling unit, a dilution unit and a measuring unit.

[0007] The sampling unit comprises a sampling pipe, the outlet of the sampling pipe is connected with a sampling connector, the sampling connector is connected with a measuring connector, a measuring unit is arranged in a measuring cavity inside the measuring connector, and a heater is arranged on the sampling connector and the measuring connector; the tail end of the measuring cavity is connected with a cavity connector, the cavity connector is connected with a Venturi connector, the Venturi connector is connected with a jet pump, and the jet pump is connected with an air outlet seat;

[0008] The dilution unit comprises a heating probe, the heating probe is internally provided with a sampling pipe and a dilution pipeline, the air inlet of the sampling pipe extends to the outside of the heating probe, and the sampling pipe in the heating probe is in communication with the outlet of the dilution pipeline;

[0009] The measuring unit comprises a quartz glass pipe arranged in the measuring cavity, a sealing seat is arranged at the top end of the quartz glass pipe, a laser emitter is arranged on the sealing seat, a light signal receiver used in cooperation with the laser emitter is arranged on one side of the quartz glass pipe, a laser beam is emitted into the quartz glass pipe through the laser emitter, the light signal receiver receives the laser beam, and the laser intensity change received is converted into an electric signal for subsequent processing and calculation of the dust concentration in the sample gas.

[0010] As a preferred scheme of the dilution method dust measuring device, the bottom of the jet pump is connected with an electric proportional valve through a pipeline, the jet pump is used for generating negative pressure to guide the sample gas and the dilution gas into the measuring unit, and the electric proportional valve is used for detecting the total flow pressure difference of the sample gas and the dilution gas and calculating the flow.

[0011] As a preferred scheme of the dilution method dust measuring device, one side of the electric proportional valve is provided with a differential pressure detector, the differential pressure detector is used for detecting the total flow pressure difference of the sample gas and the dilution gas and calculating the flow.

[0012] As a preferred scheme of the dilution method dust measuring device, the differential pressure detector is in communication with the internal cavity of the Venturi connector through a pipeline, and the Venturi connector utilizes the Venturi effect to accelerate the flow of gas and enhance the measuring effect.

[0013] As a preferred scheme of the dilution method dust measuring device, an electric heating wire is arranged on the heating probe, and the inlet of the dilution pipeline is connected with a mass flow meter penetrating through the heating probe, so that the flow of the dilution gas is controlled.

[0014] As a preferred scheme of the dilution method dust measuring device, a heat preservation box is arranged outside the measuring unit, a box body is arranged outside the heat preservation box, and the mass flow meter is arranged in the box body.

[0015] As a preferred scheme of the dilution method dust measuring device, the outer wall of the box is connected with a mounting flange through bolts, and the tail of the heating probe rod is arranged in the corresponding slot hole of the mounting flange.

[0016] The utility model discloses the beneficial effect:

[0017] 1, the utility model discloses a dilution unit dilutes sample gas, specifically, through the jet pump and mass flowmeter accurate control sample gas and dilution gas's flow, realizes the effective dilution of sample gas, reduces the dust concentration, can effectively reduce the pollution of the quartz glass tube in the measuring cavity seat, improves the accuracy of laser scattering measurement, and further improves the accuracy of measurement data, can reduce the maintenance period of equipment.

[0018] 2, the design of heating probe rod and heat preservation box can reduce the influence of environmental temperature on measurement, improve the environmental adaptability of the device.

[0019] 3, the application of the electric proportional valve and the differential pressure detector realizes the accurate control and monitoring of flow, and improves the intelligent level of the device.

[0020] 4, the utility model discloses the compact overall design of device, and the reasonable component layout is convenient for installation and maintenance. DRAWINGS

[0021] In order to more clearly illustrate the technical scheme of the embodiment of the utility model, the following will be briefly introduced to the drawing needed to be used in the embodiment description, and obviously, the drawing in the following description is only some embodiments of the utility model, and for the ordinary skilled person in the art, under the premise of not paying the creative labor, other drawings can also be obtained according to these drawings. Wherein:

[0022] Figure 1 It is the overall structure schematic diagram of the utility model.

[0023] Figure 2 It is the overall structure schematic diagram of prior art.

[0024] In the drawing: 100, sampling unit;101, sampling pipe;102, measurement connecting seat;103, venturi seat;104, jet pump;105, gas outlet seat;106, electric proportional valve;107, differential pressure detector;108, cavity connecting seat;109, sampling connecting seat;

[0025] 200, dilution unit;201, heating probe rod;202, dilution pipeline;203, mass flowmeter;204, heater;

[0026] 300, measuring unit; 301, quartz glass tube; 302, sealing seat; 303, laser emitter; 304, optical signal receiver; 305, incubator;

[0027] 400, box; 401, mounting flange. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0029] In the following description, a lot of specific details are set forth in order to facilitate a full and complete understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the connotation of the present application, therefore the present application is not limited by the specific embodiments disclosed below.

[0030] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. In different places in this specification, "in one embodiment" does not mean the same embodiment, nor is it an independent or alternative embodiment that excludes other embodiments.

[0031] Thirdly, the present application is described in detail in conjunction with the schematic diagram, and in order to facilitate the description, the sectional view of the device structure will be partially enlarged without the general proportion, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, the three-dimensional spatial dimensions including length, width and depth should be included in actual manufacture.

[0032] Reference Figure 1 For the embodiments of the present application, a dilution method dust measuring device is provided, which comprises a sampling unit 100, a dilution unit 200 and a measuring unit 300;

[0033] The sampling unit 100 comprises a sampling pipe 101, the outlet of the sampling pipe 101 is connected with a sampling connector 109, the sampling connector 109 is connected with a measuring connector 102, a measuring unit 300 is arranged in a measuring cavity inside the measuring connector 102, and a heater 204 is arranged on the sampling connector 109 and the measuring connector 102; the tail end of the measuring cavity is connected with a cavity connector 108, the cavity connector 108 is connected with a Venturi connector 103, the Venturi connector 103 is connected with a jet pump 104, and the jet pump 104 is connected with an air outlet seat 105; the bottom of the jet pump 104 is connected with an electric proportional valve 106 through a pipeline, the jet pump 104 is used for generating negative pressure to guide sample gas and dilution gas into the measuring unit 300, and the electric proportional valve 106 is used for detecting the flow of the sample gas and the dilution gas; a differential pressure detector 107 is arranged on one side of the electric proportional valve 106, the differential pressure detector 107 is used for detecting the differential pressure of the total flow of the sample gas and the dilution gas, and is used for calculating the flow; the differential pressure detector 107 is in communication with the internal cavity of the Venturi connector 103 through a pipeline, and the Venturi connector 103 utilizes the Venturi effect to accelerate the flow of gas and enhance the measurement effect.

[0034] The dilution unit 200 comprises a heating probe 201, an electric heating wire is arranged on the heating probe 201, the heating probe 201 is internally provided with a sampling pipe 101 and a dilution pipeline 202, the gas inlet of the sampling pipe 101 extends to the outside of the heating probe 201, and the sampling pipe 101 in the heating probe 201 is in communication with the outlet of the dilution pipeline 202; the inlet of the dilution pipeline 202 is connected with a mass flow meter 203 through the heating probe 201, and the mass flow meter 203 is used for controlling the flow of the dilution gas.

[0035] The measuring unit 300 comprises a quartz glass pipe 301 arranged in a measuring cavity, a sealing seat 302 is arranged at the top end of the quartz glass pipe 301, a laser emitter 303 is arranged on the sealing seat 302, a light signal receiver 304 is arranged on one side of the quartz glass pipe 301 and is used in cooperation with the laser emitter 303, a laser beam is emitted into the quartz glass pipe 301 through the laser emitter 303, the light signal receiver 304 receives the laser beam, and according to the change of the received laser intensity, the laser intensity is converted into an electric signal for subsequent processing to calculate the dust concentration in the sample gas.

[0036] The measuring unit 300 is externally sleeved with a heat preservation box 305, the heat preservation box 305 is externally provided with a box body 400, and the mass flow meter 203 is arranged in the box body 400; a mounting flange 401 is connected on the outer wall of the box body 400 through bolts, and the tail part of the heating probe 201 is arranged in the corresponding slot hole of the mounting flange 401.

[0037] In the embodiment, in actual use, the device is fixed on the measuring point by the mounting flange 401, the sample gas is guided by the negative pressure generated by the jet pump 104, enters the device through the sampling pipe 101, is subjected to the heating treatment of the heater 204 and the heating probe 201, and the influence of the environment temperature on the measurement is reduced.

[0038] The dilution gas of another path passes through the mass flow meter 203 to control the flow, enters the dilution pipeline 202, is mixed and diluted with the sample gas in the heating probe 201, and after the dilution, the gas enters the measuring cavity in the measuring unit 300.

[0039] At the same time, the laser emitter 303 emits the laser beam into the quartz glass tube 301, the scattered light generated by the laser beam scattered by the dust is received by the light signal receiver 304; the light signal receiver 304 converts the change of the received laser intensity into an electric signal for subsequent processing, calculates the dust concentration in the sample gas, and obtains the measurement value.

[0040] In the process, the electric proportional valve 106 and the differential pressure detector 107 monitor the flow of the sample gas and the dilution gas in real time, and ensure the accuracy of the measurement.

[0041] After the measurement is completed, the sample gas is discharged to the outside of the device through the pipeline inside the cavity connecting seat 108, the Venturi seat 103, the jet pump 104 and the gas outlet seat 105.

[0042] It is worth noting that the whole device is controlled by the controller, and since the controller is a commonly used device and belongs to the existing mature technology, the electrical connection relationship and the specific circuit structure are not described here.

[0043] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application and are not limited, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced, without departing from the spirit and scope of the technical solutions of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A dilution method dust measuring device characterized by: The sampling unit (100), the dilution unit (200) and the measurement unit (300) are included. The sampling unit (100) comprises a sampling pipe (101), the outlet of the sampling pipe (101) is connected with a sampling connector (109), the sampling connector (109) is connected with a measurement connector (102), the measurement unit (300) is arranged in a measurement cavity inside the measurement connector (102), and the sampling connector (109) and the measurement connector (102) are both arranged with a heater (204); the tail end of the measurement cavity is connected with a cavity connector (108), the cavity connector (108) is connected with a Venturi connector (103), the Venturi connector (103) is connected with a jet pump (104), and the jet pump (104) is connected with an air outlet connector (105). The dilution unit (200) comprises a heating probe (201), the heating probe (201) is internally provided with the sampling pipe (101) and a dilution pipeline (202), the air inlet of the sampling pipe (101) extends to the outside of the heating probe (201), and the sampling pipe (101) in the heating probe (201) is in communication with the outlet of the dilution pipeline (202). The measurement unit (300) comprises a quartz glass pipe (301) arranged in the measurement cavity, the top end of the quartz glass pipe (301) is arranged with a sealing connector (302), the sealing connector (302) is arranged with a laser emitter (303), one side of the quartz glass pipe (301) is arranged with a light signal receiver (304) used in cooperation with the laser emitter (303), the laser emitter (303) emits a laser beam into the quartz glass pipe (301), the light signal receiver (304) receives the laser beam, and the light signal receiver (304) converts the received laser intensity change into an electric signal for subsequent processing.

2. The dilution technique dust measuring device according to claim 1, characterized in that: The bottom of the jet pump (104) is connected with an electric proportional valve (106) through a pipeline, the jet pump (104) is used for generating negative pressure to guide sample gas and dilution gas into the measurement unit (300), and the electric proportional valve (106) is used for detecting the flow of the sample gas and the dilution gas.

3. The dilution technique dust measuring device according to claim 2, characterized in that: One side of the electric proportional valve (106) is arranged with a differential pressure detector (107), the differential pressure detector (107) is used for detecting the differential pressure of the total flow of the sample gas and the dilution gas, and is used for calculating the flow.

4. The dilution technique dust measuring device as claimed in claim 3, characterized in that: The differential pressure detector (107) is in communication with the internal cavity of the Venturi connector (103) through a pipeline, and the Venturi connector (103) utilizes the Venturi effect to accelerate the flow of gas and enhance the measurement effect.

5. The dilution technique dust measuring device as claimed in claim 1, characterized in that: The heating probe (201) is arranged with an electric heating wire, the inlet of the dilution pipeline (202) penetrates through the heating probe (201) and is connected with a mass flow meter (203) for controlling the flow of the dilution gas.

6. The dilution technique dust measuring device as claimed in claim 1, characterized in that: The measurement unit (300) is externally sleeved with a heat preservation box (305), the heat preservation box (305) is externally provided with a box body (400), and the mass flow meter (203) is arranged in the box body (400).

7. The dilution technique dust measuring device as claimed in claim 6, characterized in that: The outer wall of the box body (400) is connected with a mounting flange (401) through bolts, and the tail of the heating probe (201) is arranged in a corresponding slot hole in the mounting flange (401).

Images