Flow calibration device for constant-flow atmosphere sampling instrument

Abstract

The utility model discloses a flow proofreading device for constant flow atmosphere sampling instrument, including box and vortex type air pump, the inside of box is placed constant flow atmosphere sampling instrument body, the one side of constant flow atmosphere sampling instrument body outer surface is fixedly communicated with a first conduit, one end of the first conduit is fixedly communicated with a sampling pipe, the other end of the first conduit is fixedly communicated with the vortex type air pump, and the vortex type air pump is fixedly communicated with the vortex type air pump. A gas mass flow meter is fixedly mounted at one end of the sampling pipe; a box cover is hinged to the rear side of the top of the box body, and an atmospheric pressure gauge is fixedly installed at one end of the upper surface of the box cover in a penetrating mode. According to the utility model, through the arrangement of the box body, the vortex type air pump, the atmospheric pressure gauge and the gas mass flow meter, the whole set of device is simple in structure and reasonable in design, can be used for checking whether the flow of the constant-flow atmospheric sampling instrument is accurate in a laboratory, and can simulate that the constant-flow atmospheric sampling instrument can still accurately display the sampling flow under different atmospheric pressures; and the method and the device have the characteristics of high applicability and low cost.

Description

Technical Field

[0001] The utility model relates to the technical field of equipment verification of constant-current atmospheric samplers, in particular to a flow calibration device for constant-current atmospheric samplers. Background Art

[0002] An atmospheric sampler is an instrument or device for collecting atmospheric pollutants or polluting the atmosphere. A constant current atmospheric sampler can be used to measure gases such as formaldehyde, ammonia, TVOC, benzene in the air and individual dust in the workplace. It is an ideal choice for indoor monitoring departments of buildings, environmental monitoring departments, industrial and mining enterprises, and occupational health departments to collect various toxic and harmful gases and individual dust.

[0003] During the two verification and calibration periods, the functions and indicators of the measuring equipment need to be checked to understand the status of the equipment and confirm whether the equipment continues to meet the test requirements. As a field sampling device, the accuracy of the flow of the constant flow air sampler will have a significant impact on the test results, and the frequency of use is high, so the flow rate needs to be regularly checked in the laboratory to ensure the effectiveness of the test work. Utility Model Content

[0004] The utility model aims to solve the shortcomings in the prior art and proposes a flow calibration device for a constant flow atmospheric sampler.

[0005] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme: a flow calibration device for a constant-flow atmospheric sampler, comprising a box and a vortex air pump, a constant-flow atmospheric sampler body is placed inside the box, a first conduit is fixedly connected to one side of the outer surface of the constant-flow atmospheric sampler body, one end of the first conduit is fixedly connected to a sampling tube, and a gas mass flowmeter is fixedly installed at one end of the sampling tube;

[0006] A box cover is hingedly connected to the top rear side of the box body, and an atmospheric pressure gauge is fixedly installed through one end of the upper surface of the box cover;

[0007] The air inlet and the air outlet of the vortex air pump are respectively fixedly connected with a second conduit and a third conduit, and one end of the second conduit and the third conduit are both fixedly connected to one side of the outer surface of the box.

[0008] Furthermore, the other side of the outer surface of the box body is fixedly connected to an exhaust pipe, and a valve body is fixedly installed at one end of the exhaust pipe.

[0009] Furthermore, through holes matching the second conduit and the third conduit are respectively opened on one side of the outer surface of the box body, and another through hole matching the exhaust pipe is opened on the other side of the outer surface of the box body.

[0010] Furthermore, the first conduit, the second conduit and the third conduit are all hoses.

[0011] Furthermore, a lock buckle is fixedly installed on one side of the outer surface of the box body and the box cover away from the hinge.

[0012] Furthermore, a handle is fixedly connected to the upper surface of the constant flow atmospheric sampler body.

[0013] Furthermore, the box body and the box cover are both made of acrylic plates, and the box body and the box cover are both colorless and transparent materials.

[0014] The utility model has the following beneficial effects:

[0015] When the utility model is in use, the flow calibration device for the constant-flow atmospheric sampler has a simple structure and reasonable design through the arranged box body, vortex air pump, atmospheric pressure gauge and gas mass flow meter. The utility model can be used for checking whether the flow of the constant-flow atmospheric sampler is accurate inside the laboratory, and can simulate that the constant-flow atmospheric sampler under different atmospheric pressures can still accurately display the sampling flow without the phenomenon of falsely high or falsely low flow. The utility model has the characteristics of strong applicability and low cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional diagram of the utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of the box of the utility model;

[0018] Figure 3 It is a stereoscopic diagram of the constant-current atmospheric sampler body of the utility model.

[0019] Legend:

[0020] 1. Box body; 2. Box cover; 3. Lock; 4. Atmospheric pressure gauge; 5. Constant flow atmospheric sampler body; 6. First conduit; 7. Gas mass flow meter; 8. Exhaust pipe; 9. Second conduit; 10. Third conduit; 11. Vortex air pump; 12. Handle; 13. Valve body; 14. Sampling tube. DETAILED DESCRIPTION

[0021] Figures 1 to 3 As shown, it relates to a flow calibration device for a constant flow atmospheric sampler, comprising a box body 1 and a vortex air pump 11, a constant flow atmospheric sampler body 5 is placed inside the box body 1, a first conduit 6 is fixedly connected to one side of the outer surface of the constant flow atmospheric sampler body 5, one end of the first conduit 6 is fixedly connected to a sampling tube 14, one end of the sampling tube 14 is fixedly installed with a gas mass flowmeter 7, and the gas mass flowmeter 7 can be used to calibrate the flow of the constant flow atmospheric sampler body 5;

[0022] A box cover 2 is hinged at the top rear side of the box body 1, and an atmospheric pressure gauge 4 is fixedly installed through one end of the upper surface of the box cover 2. The atmospheric pressure gauge 4 can monitor the atmospheric pressure in the box body 1, and a lock buckle 3 is fixedly installed on one side of the outer surface of the box body 1 and the box cover 2 away from the hinge, so that the box body 1 and the box cover 2 can be closed to achieve independent sealing of the entire test space;

[0023] The air inlet and the air outlet of the vortex air pump 11 are fixedly connected to the second duct 9 and the third duct 10 respectively, and one end of the second duct 9 and the third duct 10 are fixedly connected to one side of the outer surface of the box body 1. Correspondingly, one side of the outer surface of the box body 1 is provided with through holes matching the second duct 9 and the third duct 10.

[0024] An exhaust pipe 8 is fixedly connected to the other side of the outer surface of the box body 1, and another through hole matching the exhaust pipe 8 is opened on the other side of the outer surface of the box body 1, and a valve body 13 is fixedly installed at one end of the exhaust pipe 8, and the exhaust pipe 8 can be adjusted by the valve body 13 to control the atmospheric pressure in the box body 1.

[0025] The first conduit 6, the second conduit 9 and the third conduit 10 are all hoses, and the three can be made of materials such as rubber hoses, plastic spring hoses, etc.

[0026] A handle 12 is fixedly connected to the upper surface of the constant flow atmospheric sampler body 5 , and the constant flow atmospheric sampler body 5 can be lifted by holding the handle 12 , thereby making it convenient for the staff to take it out from the inside of the box 1 .

[0027] The box body 1 and the box cover 2 are both made of acrylic plates, and the box body 1 and the box cover 2 are both colorless and transparent materials. The box body 1 and the box cover 2 made of acrylic material have good tensile and impact resistance, and good toughness, so they can withstand a certain positive pressure and negative pressure, and the colorless and transparent material makes it easy for the staff to observe the readings on the gas mass flow meter 7 and the constant flow atmospheric sampler body 5 through the box body 1.

[0028] When using the flow calibration device for the constant flow atmospheric sampler, that is, using the gas mass flowmeter 7 to self-calibrate the flow of the constant flow atmospheric sampler body 5, the atmospheric pressure should be changed at a certain ambient temperature to simulate whether the flow value of the atmospheric sampler under different atmospheric pressures meets the requirements, that is, the error is within 5%:

[0029] First, the vortex air pump 11 is used to evacuate or inflate the acrylic box 1 from the second conduit 9 or the third conduit 10 to achieve the purpose of reducing or increasing the atmospheric pressure in the acrylic box 1, and the atmospheric pressure value in the box 1 can be monitored by the atmospheric pressure gauge 4. The atmospheric pressure in the box 1 can also be controlled by adjusting the exhaust pipe 8 on the acrylic box 1. When the pressure reaches a predetermined value, the constant flow atmospheric sampler body 5 is started and the corresponding flow rate is set. After the flow rate of the constant flow atmospheric sampler body 5 is stable, the gas mass flowmeter 7 is started to allow the gas to pass through the first conduit 6 and the sampling tube 14 from the flowmeter to the constant flow atmospheric sampler body 5, and the reading of the gas mass flowmeter 7 is read and recorded. This flow rate is the actual flow rate of the atmospheric sampler.

[0030] Specifically, for example, the BS type constant flow atmospheric sampler purchased on the market displays a flow rate Q1 at a temperature of 20°C and an atmospheric pressure of 101.3 kPa. This flow rate is converted to a flow rate Q2 under standard conditions (0°C, 101.3 kPa) (Q2 = Q1 × [273 / (273+t)] × [p / 101.3]).

[0031] The MF4000 series gas mass flowmeter purchased on the market shows the flow rate Q3 at a temperature of 20°C and an atmospheric pressure of 101.3 kPa. This flow rate is also converted to the flow rate Q4 under standard conditions (0°C, 101.3 kPa) (Q4 = Q3 × [273 / (273+t)] × [p / 101.3]). The error between Q2 and Q4 is calculated to be ≤5% (error = (Q2-Q4) / (Q2+Q4) × 100%), indicating that the equipment can continue to be put into use.

[0032] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A flow calibration device for a constant flow atmospheric sampler, comprising a housing (1) and a vortex air pump (11), characterized in that: A constant-flow atmospheric sampler body (5) is placed inside the box (1); a first conduit (6) is fixedly connected to one side of the outer surface of the constant-flow atmospheric sampler body (5); one end of the first conduit (6) is fixedly connected to a sampling tube (14); and a gas mass flow meter (7) is fixedly installed at one end of the sampling tube (14); A box cover (2) is hingedly connected to the top rear side of the box body (1), and an atmospheric pressure gauge (4) is fixedly installed through one end of the upper surface of the box cover (2); The air inlet and the air outlet of the vortex air pump (11) are respectively fixedly connected to a second conduit (9) and a third conduit (10), and one end of the second conduit (9) and the third conduit (10) are both fixedly connected to one side of the outer surface of the box body (1).

2. A flow calibration device for a constant flow atmospheric sampler according to claim 1, characterized in that: The other side of the outer surface of the box body (1) is fixedly connected to an exhaust pipe (8), and a valve body (13) is fixedly installed at one end of the exhaust pipe (8).

3. A flow calibration device for a constant flow atmospheric sampler according to claim 2, characterized in that: Through holes matching the second conduit (9) and the third conduit (10) are respectively opened on one side of the outer surface of the box body (1), and another through hole matching the exhaust pipe (8) is opened on the other side of the outer surface of the box body (1).

4. A flow calibration device for a constant flow atmospheric sampler according to claim 3, characterized in that: The first conduit (6), the second conduit (9) and the third conduit (10) are all hoses.

5. A flow calibration device for a constant flow atmospheric sampler according to claim 4, characterized in that: A lock buckle (3) is fixedly mounted on one side of the outer surface of the box body (1) and the box cover (2) away from the hinge.

6. A flow calibration device for a constant flow atmospheric sampler according to claim 5, characterized in that: A handle (12) is fixedly connected to the upper surface of the constant flow atmospheric sampler body (5).

7. A flow calibration device for a constant flow atmospheric sampler according to claim 1, characterized in that: The box body (1) and the box cover (2) are both made of acrylic plates, and the box body (1) and the box cover (2) are both colorless and transparent materials.

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