Air sampling equipment

Abstract

The utility model discloses air sampling equipment in the technical field of sampling equipment, the air sampling equipment comprises a machine body, an exhaust pipe, a sampling pipe and a mounting ring arranged in the machine body, the mounting ring is provided with a sampling film and a plurality of air holes, and exhaust fans are arranged in the exhaust pipe and at the joint of the machine body and the sampling pipe; the sampling pipe is inverted L-shaped, and one end of the sampling pipe is rotationally connected with the machine body. According to the scheme, the sampling pipe is sealed on rainy days, external humid air is prevented from entering the sampling pipe, and the situation that the sampling film is abandoned when the dry sampling film absorbs too much water is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sampling equipment, in particular to an air sampling equipment. Background Art

[0002] The quality of air reflects the degree of air pollution, which is judged by the concentration of pollutants in the air. Air pollution is a complex phenomenon. The concentration of air pollutants at a specific time and place is affected by many factors. The emission of man-made pollutants from fixed and mobile pollution sources is one of the most important factors affecting air quality, including exhaust from vehicles, ships, aircraft, industrial pollution, residents' living and heating, garbage incineration, etc. The development density of the city, topography and meteorology are also important factors affecting air quality. Therefore, it is necessary to test the air. The air is sampled by using a sampling device and then tested.

[0003] In the prior art, the air sampling device includes a body, a sampling tube, an exhaust pipe, and a mounting ring arranged in the body. The mounting ring is provided with a sampling membrane and a plurality of air holes. An exhaust fan is provided in the exhaust pipe and at the connection between the sampling tube and the body. The air outside is extracted by the exhaust fan. The air passes through the sampling tube, the sampling membrane and a plurality of air holes in sequence and is discharged from the exhaust pipe. The pollutants in the air are collected on the sampling membrane. However, due to changes in the external weather and the increase in humidity in the air on rainy days, the external wind pushes a large amount of moist air through the gap between the sampling tube and the exhaust fan blades and flows to the sampling membrane. When the dry sampling membrane absorbs too much water, it becomes moist, causing the sample collected by the sampling membrane to be invalid. Utility Model Content

[0004] The utility model aims to provide an air sampling device to solve the problem in the prior art that humid air wets the sampling membrane, and the sampling membrane absorbs too much water, causing the collected samples to become invalid.

[0005] In order to solve the above problems, the utility model provides the following technical solutions:

[0006] An air sampling device comprises a body, an exhaust pipe, a sampling tube and a mounting ring arranged in the body, the mounting ring is provided with a sampling membrane and a plurality of air holes, an exhaust fan is provided in the exhaust pipe and at the connection between the body and the sampling tube; the sampling tube is in an inverted L shape, one end of the sampling tube is rotatably connected to the body, the body is provided with a servo motor for driving the sampling tube to rotate, the other end of the sampling tube is fixedly sleeved with a first sealing plate, the first sealing plate is provided with a sampling groove, a sealing plug is fixedly provided in the middle of the first sealing plate, the sampling tube is provided with a movable second sealing plate for sealing the sampling groove, the second sealing plate is provided with a sampling hole for inserting and sealing the sealing plug, and the sampling tube is also fixedly provided with a limit ring for limiting the second sealing plate from sliding toward the body.

[0007] The working principle and beneficial effects of the utility model:

[0008] The servo motor has a self-locking function, so it can lock the position of the sampling tube and keep it stationary. At this time, the end of the sampling tube away from the body is facing upward, and the second sealing plate is away from the first sealing plate and is blocked by the limit ring, so that it remains stationary. The exhaust fan works to allow air to enter the body through the sampling slot and the sampling hole, and is sampled through the sampling membrane. When the external environment changes and it rains, the servo motor drives the sampling tube to rotate downward, and the second sealing plate is active. Under the influence of its own gravity, the second sealing plate slides toward the first sealing plate, and the second sealing plate blocks the sampling slot. The sealing plug is inserted into the sampling hole for sealing, thereby achieving complete sealing, and the moist air from the outside cannot flow into the sampling tube. When the outside weather is clear, the servo motor drives the sampling tube to rotate upward, and the second sealing plate is affected by its own gravity. The second sealing plate moves toward the limit ring, the sealing plug is separated from the sampling hole, and is blocked by the limit ring, and the air enters the body through the sampling slot and the sampling hole. In addition, the servo motor of this solution can drive the sampling tube to rotate at any angle. When the rotation angle of the sampling tube does not exceed 90 degrees, the second sealing plate will not move toward the first sealing plate, so that the air above the body can be sampled at multiple angles and air in different spatial dimensions can be collected.

[0009] In rainy days, this solution seals the sampling slot through the second sealing plate and the vent hole through the sealing plug, thereby achieving airtightness and preventing external moist air from entering the sampling tube. The dry sampling membrane will not absorb too much moisture, causing the sample collected by the sampling membrane to become invalid.

[0010] Furthermore, the exhaust pipe is provided with a one-way valve that is open to the outside environment. The one-way valve controls air to flow only toward the outside of the exhaust pipe, thereby limiting the outside air from entering the machine body through the exhaust pipe.

[0011] Furthermore, the sampling slots are arranged in a ring shape, which can increase the ventilation volume and improve the sampling speed.

[0012] Furthermore, the second sealing plate is specifically a metal plate with high density. A metal plate with high density has high gravity, and is thus more affected by its own gravity, which facilitates the sliding of the second sealing plate in the sampling tube.

[0013] Furthermore, the limiting ring is provided with a rubber layer, which cushions the impact force generated by the falling of the second sealing plate.

[0014] Furthermore, a plurality of the air holes are distributed in a ring shape on the mounting ring, so that the air inside the machine body can be quickly extracted. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of an air sampling device of the utility model;

[0016] Figure 2 for Figure 1 Schematic diagram of the structure when the sampling tube is closed;

[0017] Figure 3 for Figure 1 A partial enlarged schematic diagram of

[0018] Figure 4 for Figure 2 A partial enlarged schematic diagram of . DETAILED DESCRIPTION

[0019] The following is further described in detail through specific implementation methods:

[0020] The figure marks in the drawings of the specification include: exhaust pipe 1, body 2, air vent 3, driving gear 4, driven gear 5, sampling tube 6, exhaust fan 7, sampling membrane 8, mounting ring 9, first sealing plate 10, sealing plug 11, second sealing plate 12, sampling slot 13, sampling hole 14, and limiting ring 15.

[0021] In the following statements, directional words such as "left", "right", "up", and "down" are all based on the directions shown in the diagram. In practice, if the corresponding structures are changed in the same direction based on the directions while keeping the relative positions unchanged, it will not affect the implementation of the plan.

[0022] Embodiment: An air sampling device, such as Figure 1 and Figure 3 As shown, it includes a body 2, an exhaust pipe 1, a sampling tube 6 and a mounting ring 9 fixedly arranged in the body 2, the mounting ring 9 is fixedly provided with a sampling membrane 8 and a plurality of air holes 3, and an exhaust fan 7 is fixedly provided in the exhaust pipe 1 and at the connection between the sampling tube 6 and the body 2.

[0023] The sampling tube 6 is in an inverted L shape. The left end of the sampling tube 6 is rotatably connected to the body 2. The body 2 is fixedly provided with a servo motor that drives the sampling tube 6 to rotate, that is, the movable end of the servo motor is fixedly sleeved on the driving gear 4, and the sampling tube 6 is fixedly sleeved on the driven gear 5 that meshes with the driving gear 4.

[0024] This embodiment uses a servo motor of model MZ751A200 produced by Nidec Corporation. The servo motor is a commonly used mechanical transmission part in the field. It is a motor that can convert electrical signals into mechanical motion. It can rotate the active end of the motor to the required position and maintain the position by controlling the current of the motor. The servo motor has a self-locking function. The principle of self-locking is mainly to lock the output shaft of the servo motor through the electromagnetic brake built into the servo motor. The driving gear 4 and the driven gear 5 remain stationary, so that the sampling tube 6 remains stationary under the self-locking action of the servo motor.

[0025] The first sealing plate 10 is fixedly sleeved at the tube mouth at the right end of the sampling tube 6. The first sealing plate 10 is provided with a sampling groove 13. A sealing plug 11 is fixedly provided in the middle of the first sealing plate 10. The sealing plug 11 is a rubber plug. The sampling tube 6 is provided with a second sealing plate 12 that is movable and used to seal the sampling groove 13. The second sealing plate 12 is specifically a metal plate. The second sealing plate 12 is provided with a sampling hole 14 for the sealing plug 11 to be inserted and sealed. The sampling tube 6 is also fixed with a limit ring 15 that limits the second sealing plate 12 from sliding toward the body 2.

[0026] like Figure 3 As shown, the servo motor has a self-locking function, so it can lock the position of the sampling tube 6 and keep it still. At this time, the sampling tube 6 is facing upward, the second sealing plate 12 is away from the first sealing plate 10, and is blocked by the limit ring 15, so that it remains still. Then the exhaust fan 7 works to allow air to enter the body 2 through the sampling slot 13 and the sampling hole 14, and pass through the sampling membrane 8 to be sampled. When the external environment changes and it rains, as Figure 2 and Figure 4As shown, at this time, the servo motor drives the sampling tube 6 to rotate downward, and the second sealing plate 12 is movable. Under the influence of its own gravity, the second sealing plate 12 slides toward the first sealing plate 10, and the second sealing plate 12 blocks the sampling slot 13. The sealing plug 11 is inserted into the sampling hole 14 for sealing, thereby achieving complete sealing, and the moist air from the outside cannot flow into the sampling tube 6. When the outside environment is clear, the servo motor drives the sampling tube 6 to rotate upward, and the second sealing plate 12 is affected by its own gravity. The second sealing plate 12 moves toward the limit ring 15, and the sealing plug 11 is separated from the sampling hole 14 and blocked by the limit ring 15. The air enters the body 2 through the sampling slot 13 and the sampling hole 14. In addition, the servo motor of this solution can drive the sampling tube 6 to rotate at any angle. When the rotation angle of the sampling tube 6 does not exceed 90 degrees, the second sealing plate 12 will not move toward the first sealing plate 10, so that the air can be sampled at multiple angles and the air in different spaces can be collected.

[0027] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

Claims

1. An air sampling device, comprising a body, an exhaust pipe, a sampling tube and a mounting ring arranged in the body, the mounting ring is provided with a sampling membrane and a plurality of air holes, and an exhaust fan is provided in the exhaust pipe and at the connection between the body and the sampling tube; characterized in that: The sampling tube is in an inverted L shape, one end of the sampling tube is rotatably connected to the machine body, the machine body is provided with a servo motor for driving the sampling tube to rotate, the other end of the sampling tube is fixedly sleeved with a first sealing plate, the first sealing plate is provided with a sampling groove, a sealing plug is fixedly provided in the middle of the first sealing plate, the sampling tube is provided with a movable second sealing plate for sealing the sampling groove, the second sealing plate is provided with a sampling hole for the sealing plug to be inserted and sealed, and the sampling tube is also fixedly provided with a limit ring for limiting the second sealing plate from sliding toward the machine body.

2. The air sampling device according to claim 1, characterized in that: The exhaust pipe is provided with a one-way valve which is connected to the external environment.

3. The air sampling device according to claim 2, characterized in that: The sampling grooves are distributed in a ring shape.

4. The air sampling device according to claim 3, characterized in that: The second sealing plate is specifically a metal plate with high density.

5. The air sampling device according to any one of claims 1 to 4, characterized in that: The limiting ring is provided with a rubber layer.

6. The air sampling device according to claim 5, characterized in that: A plurality of the air holes are distributed in a ring shape on the mounting ring.

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