A dust sampler flow calibration device

Abstract

This utility model discloses a flow rate calibration device for a dust sampler, relating to the technical field of dust sampler technology, and solves the problem of inconvenient flow rate testing in dust samplers. It includes: a measuring column, which is vertically arranged and has a cavity extending along its length; an air outlet at the upper end of the measuring column communicating with the cavity; and a liquid inlet at the lower end of the measuring column communicating with the cavity, the liquid inlet being used for bubbles to enter the cavity; and graduation lines arranged sequentially from bottom to top on the surface of the measuring column; and a connecting tube, one end of which is connected to the air outlet, and the other end for connecting to the dust sampler. This testing device has the advantages of simple structure and convenient operation, and can indirectly measure the extraction flow rate of the dust sampler. The measured results can be compared with design standards to determine whether the flow rate of the dust sampling head meets the requirements.

Description

Technical Field

[0001] This utility model relates to the field of dust sampler technology, and in particular to a dust sampler flow calibration device. Background Technology

[0002] A dust sampler is a portable device used to collect dust samples from the air. It measures dust concentration based on the principle of particulate matter deposition, providing data for safety management and occupational disease prevention. It is widely used in coal mine monitoring, metal smelting, construction, and disease control. With increasing public concern about air pollution, especially smog, dust samplers, instruments used to measure the average concentration of particulate matter in the environment, have become increasingly prevalent.

[0003] The dust sampler contains an air pump to draw airborne dust into its sampling head. After manufacturing, the dust sampler undergoes a flow rate test to ensure it meets design flow rates. Currently, specialized flow rate testing equipment is lacking. Utility Model Content

[0004] The purpose of this invention is to solve the above-mentioned problems by designing a dust sampler flow calibration device, which solves the problem of inconvenient flow testing of dust samplers.

[0005] The technical solution of this utility model to achieve the above objectives is a dust sampler flow calibration device, comprising: The measuring column is vertically arranged and has a cavity extending along its length. The upper end of the measuring column has an air outlet connected to the cavity, and the lower end of the measuring column has a liquid inlet connected to the cavity. The liquid inlet is used for bubbles to enter the cavity. The surface of the measuring column is provided with graduation lines from bottom to top. A connecting pipe, one end of which is connected to the air outlet, and the other end of which is used to connect to the dust sampler; The cavity is evacuated by a dust sampler, causing the bubbles to rise gradually from bottom to top within the cavity.

[0006] Preferably, it also includes a support base, and the measuring column is vertically fixed to the side of the support base.

[0007] Preferably, fasteners are provided near the upper and lower ends of the measuring column, and the fasteners secure the two ends of the measuring column to the support base. The fasteners are connected to the support base by screws.

[0008] Preferably, the diameter of the measuring column near the liquid inlet gradually decreases from top to bottom to form a conical part, and the fastener near the lower end of the measuring column is attached to the conical part.

[0009] Preferably, the color of the scale line is clearly distinguishable from the surface color of the support base.

[0010] Preferably, the inner wall of the cavity is smooth.

[0011] Preferably, the connecting pipe is a flexible hose.

[0012] Preferably, it also includes a container filled with soapy water, wherein the diameter of the container opening is not less than the diameter of the liquid inlet.

[0013] Its advantages over existing technologies are: The testing device provided by this utility model has the advantages of simple structure and convenient operation. This testing device can indirectly measure the extraction flow rate of the dust sampler. The measured results can be compared with design standards to determine whether the flow rate of the dust sampling head meets the requirements, and finally, the flow rate of the dust sampler can be calibrated.

[0014] When the dust sampler is working, the measuring column is evacuated through the connecting pipe, creating negative pressure in the cavity inside the measuring column. Bubbles are drawn into the measuring column from the inlet and then slowly rise along the cavity inside the measuring column. The flow rate of the dust sampler can be indirectly measured by measuring the height of the bubble in the cavity within a certain time. Since the bubble is extremely light and has no load, the measurement result is basically close to the actual flow rate of the dust sampler with very small error. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the isometric structure of the dust sampler flow calibration device; Figure 2 This is a front view schematic diagram of the dust sampler flow calibration device; Figure 3 This is a schematic diagram of the bubble just entering the measuring column; Figure 4 This is a diagram showing what happens when bubbles rise to a certain position.

[0016] In the diagram, 1 is the measuring column; 2 is the connecting tube; 3 is the fastener; 4 is the sealant; 5 is the bottle cap; 6 is the support base; 7 is the dust sampler; and 8 is the scale line. Detailed Implementation

[0017] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0018] A preferred embodiment of this utility model provides a dust sampler flow calibration device, which is used to measure the flow rate of the dust sampler 7, that is, whether the suction force of the air pump inside the dust sampler 7 meets the requirements.

[0019] For details, see Figure 1 , Figure 2 The device mainly includes a support base 6, a measuring column 1, and a connecting pipe 2. The measuring column 1 is vertically fixed on the support base 6, and the connecting pipe 2 is connected to the top of the measuring column 1.

[0020] The support base 6 consists of a base plate and a vertical plate. The vertical plate is fixedly installed on the base plate, and the two are perpendicular to each other to provide stable support.

[0021] One side of the vertical plate is a vertical plane, and the measuring column 1 is vertically fixed on this vertical plane by fasteners 3.

[0022] Specifically, fastener 3 is made of flexible metal plates. There are two metal plates, located at the top and bottom of the measuring column 1, respectively. The metal plates partially wrap around the measuring column 1, and the two ends of the metal plates are fixed to the vertical plate with screws. The measuring column 1 is bound and fixed to the vertical plate by the two metal plates.

[0023] See Figure 2 To prevent the measuring column 1 from falling, the lower end of the measuring column 1 is tapered, meaning that the diameter gradually decreases from the top towards the liquid inlet near the lower end of the measuring column 1. A metal plate located on the lower side of the measuring column 1 is tightly attached to the surface of the tapered portion of the measuring column 1, and this metal plate can support the measuring column 1.

[0024] The measuring column 1 is a cylindrical glass tube that is transparent, and the cavity inside the glass tube extends along the axial direction of the glass tube. A sealant 4 is provided at the top of the glass tube, sealing the upper end of the cavity. An air outlet communicating with the cavity is located at the center of the sealant 4, and one end of the connecting pipe 2 is connected to this air outlet, forming a sealed connection between the connecting pipe 2 and the sealant 4.

[0025] The glass tube has an inlet at the bottom. Bubbles enter the glass tube through this inlet.

[0026] The glass tube has a scale line 8 engraved from bottom to top, which indicates the capacity.

[0027] The graduation line 8 is white, making it clearly visible on the surface of the glass tube. In other embodiments, the graduation line 8 can also be black for easier differentiation.

[0028] It should be noted that the color of the vertical plate of the support 6 should have a significant color difference from the color of the scale line 8, with high contrast, so that the scale line 8 can be more intuitively distinguished when reading.

[0029] Typically, a bottle cap 5 containing soapy water is placed below the glass tube. In other implementations, soapy water can be omitted, and liquids that easily produce bubbles, such as laundry detergent water, laundry liquid water, or cleaning agent water, can be used instead.

[0030] The inner diameter of the bottle cap 5 must be larger than the diameter of the liquid inlet at the lower end of the glass tube so that the bottle cap 5 can be manually lifted under the glass tube and the liquid inlet end of the glass tube will extend into the soapy water inside the bottle cap 5.

[0031] In other implementations, some coloring can be added to the soapy water to make it easier to identify the location of the bubbles inside the glass tube.

[0032] In this embodiment, the connecting tube 2 is a flexible tube, generally made of rubber, which has a certain degree of elasticity and flexibility, making it convenient to connect the rubber tube to the sampling head of the dust sampler 7.

[0033] like Figure 3 , Figure 4 As shown, before the formal measurement, first connect the connecting tube 2 to the sampling head of the dust sampler 7, and then start the dust sampler 7. Next, place the bottle cap 5 containing soapy water under the glass tube, so that the inlet of the glass tube is immersed in the soapy water. The dust sampler 7 will evacuate the glass tube, creating a negative pressure inside the glass tube. The bubbles generated by the soapy water will slowly rise along the inner wall of the glass tube until they reach the top of the inner wall, lubricating the entire inner wall. The purpose of this step is to reduce the frictional resistance of the inner wall of the glass tube, making the test results closer to the true value.

[0034] After the inner wall of the glass tube is fully lubricated with soapy water, the formal measurement begins. At this point, the bottle cap 5 containing soapy water is placed back under the glass tube, so that the inlet of the glass tube is submerged in the soapy water. When the generated bubbles enter the glass tube, a timer is used to start the measurement. The bubbles will slowly rise along the inner wall of the glass tube. When the bubbles rise and reach the corresponding scale line 8 within the set time, the volume value represented by scale line 8 can be considered the flow rate value of the dust sampler 7. If the measured flow rate value is within the standard range, the flow rate value of the dust sampler 7 can be considered qualified.

[0035] The above technical solution only embodies the preferred technical solution of this utility model. Any changes that may be made by those skilled in the art to certain parts of it embody the principle of this utility model and fall within the protection scope of this utility model.

Claims

1. A dust sampler flow calibration device, characterized in that, include: Measuring column (1), the measuring column (1) is vertically arranged, the measuring column (1) has a cavity extending in its length direction, the upper end of the measuring column (1) has an air outlet communicating with the cavity, the lower end of the measuring column (1) has a liquid inlet communicating with the cavity, the liquid inlet is used for bubbles to enter the cavity, and the surface of the measuring column (1) is provided with scale lines (8) from bottom to top. Connecting pipe (2), one end of which is connected to the air outlet, and the other end is used to connect to the dust sampler (7); The cavity is evacuated by a dust sampler (7), causing the bubbles to rise gradually from bottom to top within the cavity.

2. The dust sampler flow calibration device according to claim 1, characterized in that, It also includes a support base (6), and the measuring column (1) is vertically fixed to the side of the support base (6).

3. The dust sampler flow calibration device according to claim 2, characterized in that, The measuring column (1) is provided with fasteners (3) near its upper and lower ends. The fasteners (3) fasten the two ends of the measuring column (1) to the support base (6). The fasteners (3) are connected to the support base (6) by screws.

4. The dust sampler flow calibration device according to claim 3, characterized in that, The measuring column (1) has a tapered section whose diameter gradually decreases from top to bottom near the liquid inlet. The fastener (3) near the lower end of the measuring column (1) is attached to the tapered section.

5. The dust sampler flow calibration device according to claim 2, characterized in that, The color of the scale line (8) is clearly distinguishable from the surface color of the support base (6).

6. The dust sampler flow calibration device according to claim 1, characterized in that, The inner wall of the cavity is smooth.

7. The dust sampler flow calibration device according to claim 1, characterized in that, The connecting pipe (2) is a flexible tube.

8. The dust sampler flow calibration device according to claim 1, characterized in that, It also includes a container filled with soapy water, wherein the diameter of the container opening is not less than the diameter of the liquid inlet.

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