Gas sampling device

Abstract

The utility model discloses a gas sampling device, which relates to the technical field of gas sampling, and comprises a box body, a box cover, a gas collecting bag and a vacuum pump, a fixing mechanism is arranged in the box body, and the fixing mechanism is used for clamping the gas collecting bag; the fixing mechanism comprises sliding rails arranged in parallel, two sliding seats are arranged on the sliding rails in a sliding mode, a first clamping plate and a second clamping plate are symmetrically arranged on the two sliding seats, threaded holes are concentrically formed in the sliding seats, lead screws are arranged in the threaded holes in a matched mode, and the lead screws act on the two sliding seats to move oppositely. A plurality of touch holes are formed in the first clamping plate and the second clamping plate at equal intervals; according to the utility model, the lead screw drives the first clamping plate and the second clamping plate to move in opposite directions so as to clamp and fix the gas collecting bag, so that the gas collecting bag is prevented from moving under the action of negative pressure, the gas outlet is prevented from being blocked, and the sampling efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas sampling, in particular to a gas sampling device. Background Art

[0002] Gas sampler is a common instrument used to collect gases from the atmosphere and workshop. It is widely used in atmospheric environment monitoring, health and epidemic prevention, labor protection, scientific research and other units. It can also be used in conjunction with relevant instruments to analyze the sampled gas to understand the degree of environmental pollution by harmful gases.

[0003] At present, when sampling gas, the air inlet on the sampling box is generally connected to the air collecting bag through a polytetrafluoroethylene hose, and then the air collecting bag is directly placed in the sampling box, but the air collecting bag is not fixed. Then, a vacuum pump is used to evacuate the sampling box through the air outlet to form a negative pressure. Under the action of the negative pressure in the sampling box, the air collecting bag sucks the gas through the air inlet to complete the collection. However, in this process, the air collecting bag will move in the sampling box under the action of a dynamic negative pressure. This will easily block the air collecting bag at the air outlet between the vacuum pump and the sampling box, which will result in insufficient negative pressure in the sampling box, leading to low sampling efficiency.

[0004] Therefore, the utility model proposes a gas sampling device for solving the above-mentioned technical problems, thereby fixing the position of the gas collecting bag to prevent movement and blocking of the gas outlet, thereby improving the sampling efficiency. Utility Model Content

[0005] In view of the above technical problems, the utility model provides a gas sampling device for solving the problem that there is no device to fix the gas collecting bag in the existing sampling box, which causes the gas collecting bag to move and block the gas outlet under the action of negative pressure, resulting in insufficient negative pressure and low sampling efficiency.

[0006] The above technical objectives of the utility model are achieved through the following technical solutions:

[0007] A gas sampling device, comprising a box body, a box cover, a gas collecting bag, and a vacuum pump. The box body and the box cover are hinged by hinges. The box body is provided with a gas outlet, which is connected to the vacuum pump pipeline. The box cover is provided with an air inlet, and an air guide pipe is provided between the air inlet and the gas collecting bag. The box body is provided with a fixing mechanism, which is used to clamp and fix the gas collecting bag.

[0008] The fixing mechanism comprises a parallel slide rail, two slide seats are slidably arranged on the slide rail, a first clamping plate and a second clamping plate are symmetrically arranged on the two slide seats, a threaded hole is concentrically opened on the slide seat, a lead screw is matched in the threaded hole, and the lead screw drives the two slide seats to move toward each other;

[0009] The first clamping plate and the second clamping plate are provided with a plurality of pressure contact holes at equal intervals;

[0010] The first clamping plate is provided with a plurality of support bars in the contact pressure hole, and the support bars are plugged into the contact pressure hole of the second clamping plate.

[0011] Furthermore, the first clamping plate and the second clamping plate are in an arc-shaped structure.

[0012] Furthermore, the two slide seats are provided with T-shaped slots, and the first clamping plate and the second clamping plate are clamped on the slide seats through the T-shaped slots.

[0013] Furthermore, a sunken installation opening is provided in the center of the box cover, the air inlet is located in the installation opening, a telescopic cavity is provided at one end of the box cover located at the installation opening, a sliding cover is provided in the telescopic cavity, and the sliding cover is located above the air inlet.

[0014] Furthermore, a handle is hinged in the installation opening.

[0015] Furthermore, a magnetic block is embedded in the side of the installation opening away from the telescopic cavity, and a suction block is embedded in the position of the sliding cover corresponding to the magnetic block.

[0016] Furthermore, a one-way valve is provided at the junction of the air collecting bag and the air guide tube.

[0017] Furthermore, a mounting frame is provided on the box body, and the vacuum pump is installed in the mounting frame.

[0018] Furthermore, a plurality of damping seats are arranged in a rectangular bottom portion of the box body.

[0019] Furthermore, the length of the sliding cover is greater than the length of the installation opening.

[0020] In summary, the beneficial technical effects of the utility model are:

[0021] (1) The support bar on the first clamp is used to support the air collecting bag during air collection to avoid contact between the air collecting bag and the slide rail. The first clamp and the second clamp are driven by a lead screw to move toward each other to clamp the air collecting bag between the two. This avoids movement during vacuum pump extraction, thereby preventing the air collecting bag from blocking the air outlet and causing insufficient negative pressure to affect the sampling efficiency. At the same time, the contact area between the air collecting bag and the negative pressure in the sampling box is increased by using equidistant contact pressure holes, thereby improving the sampling efficiency.

[0022] (2) The arc-shaped first clamping plate and the second clamping plate increase the contact area with the air collecting bag, making the clamping more stable.

[0023] (3) The T-shaped slot enables the first clamping plate, the second clamping plate and the slide seat to be detachably installed, which facilitates the assembly of the fixing mechanism.

[0024] (4) The air inlet can be protected by the sliding cover to prevent the air inlet from being exposed to the outside for a long time, so that impurities can enter the air duct and the air inlet can be prevented from being damaged.

[0025] (5) The magnetic block and the suction block can exert an adsorption force after the sliding cover is closed to prevent the sliding cover from opening freely and losing the protective effect on the air inlet.

[0026] (6) The one-way valve can prevent the gas in the gas collection bag from escaping freely after sampling.

[0027] (7) The damping seat is used to reduce the vibration of the vacuum pump box during operation and prevent the box from moving. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0029] Figure 2 It is a structural schematic diagram of the utility model from another angle;

[0030] Figure 3 yes Figure 1 The structural diagram of the box cover is hidden;

[0031] Figure 4 yes Figure 3 Diagram of the gas collection bag is hidden.

[0032] Figure numerals: 1. box body; 2. box cover; 3. damping seat; 4. mounting frame; 5. vacuum pump; 6. air collecting bag; 7. air inlet; 8. slide rail; 9. slide seat; 10. screw; 11. first clamping plate; 12. second clamping plate; 13. contact pressure hole; 14. support bar; 15. air outlet; 16. mounting port; 17. handle; 18. slide cover; 19. magnetic block; 20. suction block; 21. one-way valve; 22. T-slot; 23. buckle. DETAILED DESCRIPTION

[0033] The present invention will be described clearly and completely below in conjunction with the embodiments.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0035] In the description of the embodiments, unless otherwise clearly specified and limited, the terms "disposed", "connected" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or it can be connected through an intermediate medium, or it can be a communication between two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0036] See attached Figure 1-4 , a gas sampling device is shown, comprising a box body 1, a box cover 2, an air collecting bag 6, and a vacuum pump 5, wherein the box cover 2 and one side of the box body 1 are hinged by a hinge, a mounting frame 4 is provided on the box body 1, a vacuum pump 5 is provided on the mounting frame 4, and an air outlet 15 connected to a pipeline of the vacuum pump 5 is provided on the side wall of the box body 1. When sampling, the air in the box body 1 is extracted by the vacuum pump 5 through the air outlet 15 to realize negative pressure, and the box body 1 uses the negative pressure to act on the air collecting bag 6 for sampling, and four damping seats 3 are provided in a rectangular shape at the bottom of the box body 1, and the vibration of the vacuum pump 5 when working is reduced by the damping seats 3, and at the same time, the friction between the box body 1 and the ground is increased to prevent the box body 1 from moving;

[0037] A fixing mechanism for fixing the air collecting bag 6 is provided in the box body 1, and the fixing mechanism includes two slide rails 8 arranged in parallel at the bottom of the box body 1, and two slide seats 9 are arranged in parallel on the slide rails 8. Threaded holes are concentrically provided on the two slide seats 9, and the thread directions of the two threaded holes are opposite. A lead screw 10 is matched in the two threaded holes, and a bearing seat is provided at one end of the lead screw 10. The two slide seats 9 can be controlled to move toward each other through the lead screw 10. T-shaped slots 22 are provided in the length direction of the two slide seats 9, and the two slide seats 9 are respectively clamped with a first clamping plate 11 and a second clamping plate 12 through the T-shaped slots 22. The first clamping plate 11 and the second clamping plate 12 are both arc structures. The arc structure can increase the contact area with the air collecting bag 6 and improve the stability of clamping. At the same time, the first clamping plate 11 and the second clamping plate 12 are equidistant. A pressure-contact hole 13 is provided. When sampling, the pressure-contact hole 13 increases the action area of ​​the air collecting bag 6 and the negative pressure in the box body 1, thereby improving the sampling efficiency of the air collecting bag 6. At the same time, a plurality of support bars 14 are horizontally provided on the first clamping plate 11 in the pressure-contact hole 13. The other end of the support bar 14 is inserted into the pressure-contact hole 13 of the second clamping plate 12. When sampling, the air collecting bag 6 is placed on the support bar 14, and then the first clamping plate 11 and the second clamping plate 12 are driven by the lead screw 10 to move toward each other to clamp and fix the air collecting bag 6. In this way, when the vacuum pump 5 is pumping air outwards, the air collecting bag 6 is prevented from moving under the action of negative pressure, thereby preventing the air collecting bag 6 from blocking the air outlet 15, ensuring that the negative pressure can fully act on the air collecting bag 6, promoting the normal sampling, and improving the sampling efficiency.

[0038] It should be noted that by placing the air collecting bag 6 on the support bar 14, direct contact between the air collecting bag 6 and the slide rail 8 is avoided, damage and contamination of the air collecting bag 6 are prevented, and the maximum effect of the first clamping plate 11 and the second clamping plate 12 on the air collecting bag 6 is also ensured;

[0039] At the same time, a sunken installation port 16 is provided on the box cover 2, and an air inlet 7 is provided in the installation port 16. The air inlet 7 is connected to the air collecting bag 6 through an air guide pipe, and a one-way valve 21 is provided at the junction of the air guide pipe and the air collecting bag 6. The one-way valve 21 ensures that the gas in the air collecting bag 6 escapes outward after sampling.

[0040] At the same time, a handle 17 is hinged on the installation opening 16, and the handle 17 facilitates carrying the entire sampling device. At the same time, a buckle 23 for sealing is provided between the box body 1 and the box cover 2. When the vacuum pump 5 is used to evacuate air, the box cover 2 and the box body 1 are sealed by the buckle 23;

[0041] At the same time, the box body 1 is provided with a telescopic cavity on one side of the mounting opening 16, and a sliding cover 18 is slidably provided in the telescopic cavity. The length of the sliding cover 18 is greater than the length of the mounting opening 16, so that the sliding cover 18 can be prevented from falling off from the telescopic cavity. The sliding cover 18 is located above the air inlet 7. The sliding cover 18 can protect the air inlet 7, preventing the air inlet 7 from being directly exposed to the outside and impurities from entering the air inlet 7 and the air duct. It should be noted that when the handle 17 is stored in the mounting opening 16, the sliding cover 18 simultaneously shields and protects the handle 17 and the air inlet 7;

[0042] At the same time, a magnetic block 19 is embedded in the mounting opening 16 opposite to the sliding cover 18, and a suction block 20 is embedded in the position of the sliding cover 18 corresponding to the magnetic block 19. The suction block 20 is made of carbon steel Q235. The adsorption effect of the magnetic block 19 and the suction block 20 prevents the sliding cover 18 from opening freely after being closed.

[0043] When in use, first place the air collecting bag 6 on the support bar 14 of the first clamp plate 11, and then connect the air inlet 7 to the air collecting bag 6 through the air duct, and then use the screw 10 to drive the first clamp plate 11 and the second clamp plate 12 to move toward each other to clamp and fix the air collecting bag 6 therebetween, and use the buckle 23 to seal the box cover 2 and the box body 1, and then open the sliding cover 18, and at the same time start the vacuum pump 5 to use the air outlet 15 to evacuate the inside of the box body 1 to form a negative pressure, and then the air collecting bag 6 sucks the gas to be collected into the interior through the air inlet 7 under the action of the negative pressure to achieve sampling.

[0044] The above description is only a preferred specific implementation method of the present utility model, and does not limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A gas sampling device, comprising a box body (1), a box cover (2), a gas collecting bag (6), and a vacuum pump (5), wherein the box body (1) and the box cover (2) are hingedly connected by a hinge, an air outlet (15) is provided on the box body (1), and the air outlet (15) is connected to a pipeline of the vacuum pump (5), an air inlet (7) is provided on the box cover (2), and an air guide pipe is provided between the air inlet (7) and the gas collecting bag (6), characterized in that: A fixing mechanism is provided inside the box body (1), and the fixing mechanism is used to clamp and fix the air collecting bag (6); The fixing mechanism comprises a parallel slide rail (8), two slide seats (9) are slidably arranged on the slide rail (8), a first clamping plate (11) and a second clamping plate (12) are symmetrically arranged on the two slide seats (9), a threaded hole is coaxially opened on the slide seat (9), a lead screw (10) is matched in the threaded hole, and the lead screw (10) acts on the two slide seats (9) to move toward each other; A plurality of contact holes (13) are equidistantly provided on the first clamping plate (11) and the second clamping plate (12); The first clamping plate (11) is provided with a plurality of support strips (14) located in the contact pressure hole (13), and the support strips (14) are plugged into the contact pressure hole (13) of the second clamping plate (12).

2. A gas sampling device according to claim 1, characterized in that: The first clamping plate (11) and the second clamping plate (12) are in an arc-shaped structure.

3. A gas sampling device according to claim 1, characterized in that: The two slide seats (9) are provided with T-shaped slots (22), and the first clamping plate (11) and the second clamping plate (12) are clamped on the slide seats (9) via the T-shaped slots (22).

4. A gas sampling device according to claim 1, characterized in that: A sunken installation opening (16) is provided in the center of the box cover (2), the air inlet (7) is located in the installation opening (16), a telescopic cavity is provided at one end of the box cover (2) located at the installation opening (16), a sliding cover (18) is provided in the telescopic cavity, and the sliding cover (18) is located above the air inlet (7).

5. A gas sampling device according to claim 4, characterized in that: A handle (17) is hinged inside the installation opening (16).

6. A gas sampling device according to claim 4, characterized in that: A magnetic block (19) is embedded in the side of the installation opening (16) away from the telescopic cavity, and a suction block (20) is embedded in the position of the sliding cover (18) corresponding to the magnetic block (19).

7. A gas sampling device according to claim 1, characterized in that: A one-way valve (21) is provided at the joint between the air collecting bag (6) and the air guide tube.

8. A gas sampling device according to claim 1, characterized in that: A mounting frame (4) is provided on the box body (1), and the vacuum pump (5) is installed in the mounting frame (4).

9. A gas sampling device according to claim 1, characterized in that: The bottom rectangle of the box body (1) is provided with a plurality of damping seats (3).

10. A gas sampling device according to claim 4, characterized in that: The length of the sliding cover (18) is greater than the length of the installation opening (16).

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