Gas sampling pipe cap capable of preventing suck-back and facilitating sampling and analysis

Abstract

The utility model relates to a gas sampling pipe cap capable of preventing suck-back and facilitating sampling and analysis, and belongs to the technical field of gas sampling and analysis. Comprising an air outlet, an expansion cavity, an air inlet, a connecting cavity, a cover body, an air inlet pipe and an air inlet nozzle, the air outlet is formed in the top of the expansion cavity, the whole expansion cavity is in an ellipsoid shape, the bottom of the expansion cavity is sequentially connected with the connecting cavity and the cover body, and the air inlet pipe extends into the cover body from bottom to top, is inserted into the center of a top plate of the connecting cavity and is communicated with the expansion cavity; threads are arranged on the inner side of the cover body, and a rubber gasket is arranged on the tops of the threads. An air inlet is further formed in the outer side of the connecting cavity, and the air inlet communicates with the air inlet pipe and the expansion cavity in an opening and closing mode; and the air inlet nozzle is arranged at the bottom of the air inlet pipe. The sampling pipe cap can effectively solve the problems that an existing sampling pipe cap is not easy to carry, fragile and prone to air leakage.

Description

Technical Field

[0001] The utility model relates to a gas sampling tube cap, in particular to a gas sampling tube cap which is anti-backflow and convenient for sampling and analysis, and belongs to the technical field of gas sampling and analysis. Background Art

[0002] At present, when sampling and analyzing volatile gases (such as formaldehyde, ammonia, etc.) in indoor and outdoor air and building materials, glass large bubble absorption tubes are used. Glass large bubble absorption tubes have the disadvantages of being difficult to carry, fragile, and easy to leak. In addition, after collecting the sample, the sample needs to be transferred to a colorimetric tube for analysis, which is cumbersome and complicated, and the tube wall is prone to residue.

[0003] CN211825655U discloses an indoor air sampling and analysis tube including a colorimetric tube, an inlet and outlet plug, and a sealing plug. The colorimetric tube, the inlet and outlet plug, and the sealing plug are all made of glass. The tube mouth of the colorimetric tube is a frosted conical mouth, and the colorimetric tube is marked with volume scales. The inlet and outlet plugs include a bottle stopper, an air inlet pipe, and an air exhaust pipe. The bottle stopper is plugged into the tube mouth of the colorimetric tube through a frosted conical surface. A cavity connecting the colorimetric tube and the exhaust pipe is provided in the bottle stopper. The air inlet pipe passes through the bottle stopper and extends to the bottom of the colorimetric tube, thereby realizing sampling and colorimetric analysis in the colorimetric tube. In addition, CN211235550U provides a formaldehyde detection device, including: a sampling bottle, a colorimetric tube, and a colorimetric card; the sampling bottle includes: a bottle body, a bottle cap one, and a bottle cap two, which are made of plastic materials that do not interfere with formaldehyde detection, and the volume of the sampling bottle is calibrated; the colorimetric tube is made of glass material, a round tube with a flat bottom at one end and an open end at the other end, and the depth of the colorimetric scale is calibrated; the colorimetric card includes a group of rings of the color development color of the formaldehyde standard solution, which is a white-bottomed paper color card, and the color of the ring group gradually deepens from light to dark, and the color of each ring represents a formaldehyde concentration, and the color of the ring is the color of a specific amount of formaldehyde solution of corresponding concentration in the colorimetric tube placed on a white paper color card. The air sample is collected using a sampling bottle, and the sample is placed in a colorimetric tube after color development, and compared with the color of the ring of the colorimetric card, and the concentration of formaldehyde in the air sample is obtained by calculation. However, both of the above patents have the disadvantages of being difficult to carry, fragile, and easy to leak. Utility Model Content

[0004] In view of the above defects in the prior art, the utility model proposes a gas sampling tube cap which is anti-backflow and convenient for sampling and analysis, so as to solve the problems that the existing sampling tube cap is difficult to carry, fragile and easy to leak.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] A gas sampling tube cap which prevents back-inhalation and is convenient for sampling and analysis, comprises an air outlet, an expansion chamber, an air inlet, a connecting chamber, a cover body, an air inlet pipe and an air inlet nozzle; the air outlet is arranged at the top of the expansion chamber, the expansion chamber is ellipsoidal as a whole, and its bottom is sequentially connected to the connecting chamber and the cover body, the air inlet pipe extends from bottom to top into the cover body and is inserted in the center of the top plate of the connecting chamber, and is connected with the expansion chamber; a thread is arranged on the inner side of the cover body, and a rubber gasket is arranged on the top of the thread; an air inlet is also arranged on the outer side of the connecting chamber, and the air inlet is connected with the air inlet pipe and the expansion chamber in an opening and closing manner; the air inlet nozzle is arranged at the bottom of the air inlet pipe.

[0007] Furthermore, the gas sampling tube cap is integrally mounted on the universal sample tube at the bottom, and liquid absorption liquid is arranged in the universal sample tube.

[0008] Furthermore, the air inlet is a rotatable openable and closable air inlet.

[0009] Furthermore, the air inlet is arranged in the upper middle part of the outer wall of the connecting cavity.

[0010] Furthermore, the outer diameter of the expansion cavity is larger than the outer diameter of the cover body, and the outer diameter of the connecting cavity is smaller than the outer diameter of the cover body.

[0011] Furthermore, the air outlet, the expansion cavity, the air inlet, the connecting cavity, the cover body, the air inlet pipe and the air inlet nozzle are all made of plastic.

[0012] Furthermore, the expansion cavity is 30-40 mm high, and the cover body is 8-12 mm high; the total height of the gas sampling tube cap is 150-180 mm.

[0013] Furthermore, the inner diameter of the air inlet nozzle is 3 mm, the inner diameter of the air outlet is 5 mm, and the outer diameters of the air outlet and the air inlet are both 7 mm.

[0014] Compared with the prior art, the utility model has the following beneficial effects:

[0015] The utility model is made of plastic material, which is strong, durable and not easy to break. The joints are sealed with rubber gaskets and are not easy to leak. It is small in size, easy to carry and reusable. The upper end is the air outlet, the side is the air inlet, and the lower end is installed with a universal sample tube containing liquid absorption liquid, so that the universal sample tube can be disassembled separately, which is convenient for replacing sample tubes and analyzing samples. The utility model adopts a threaded connection with a rubber gasket, which is not easy to leak and ensures the set sampling volume. In addition, the utility model adds an expansion chamber to avoid the liquid sample from being sucked into the sampling instrument. The air inlet is shortened to avoid damage to the sampling instrument caused by back suction due to improper operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic elevation view of a gas sampling tube cap that prevents backflow and facilitates sampling and analysis;

[0017] Figure 2 yes Figure 1 AA section view. DETAILED DESCRIPTION

[0018] The following is combined with Figure 1-2 The utility model is further described in detail with specific embodiments to facilitate a clear understanding of the utility model, but they do not constitute a limitation on the utility model.

[0019] Example 1

[0020] like Figure 1 As shown, the gas sampling tube cap of this embodiment is anti-backflow and convenient for sampling and analysis, including an outlet 1, an expansion chamber 2, an inlet 3, a connecting chamber 4, a cover 5, an inlet pipe 6 and an inlet nozzle 7. The outlet 1 is arranged at the top of the expansion chamber 2, and the expansion chamber 2 is ellipsoidal in shape as a whole, and the bottom thereof is connected to the connecting chamber 4 and the cover 5 in sequence. The inlet pipe 6 extends from the bottom to the top into the cover 5 and is inserted in the center of the top plate of the connecting chamber 4, and is connected to the expansion chamber 2. Figure 2 As shown, a thread 51 is provided inside the cover body 5, and a rubber gasket 52 is provided on the top of the thread 51. Figure 1 As shown, the connecting chamber 4 is also provided with an air inlet 3 on the outside. The air inlet 3 is a rotatable openable and closable air inlet, which is arranged at the middle and upper part of the outer wall of the connecting chamber 4. The air inlet 3 is openably connected with the air inlet pipe 6 and the expansion chamber 2. The air inlet nozzle 7 is arranged at the bottom of the air inlet pipe 6.

[0021] In this embodiment, the gas outlet 1, the expansion chamber 2, the gas inlet 3, the connecting chamber 4, the cover body 5, the gas inlet pipe 6 and the gas inlet nozzle 7 are all made of plastic. Among them, the outer diameter of the expansion chamber 2 is larger than the outer diameter of the cover body 5, and the outer diameter of the connecting chamber 4 is smaller than the outer diameter of the cover body 5. Specifically, the expansion chamber 2 is 32.98mm high, the inner diameter is 34mm, and the height of the cover body 5 is 10mm. The inner diameter of the gas inlet nozzle 7 is 3mm, the inner diameter of the gas outlet 1 is 5mm, and the outer diameters of the gas outlet 1 and the gas inlet 3 are both 7mm. The total height of the gas sampling tube cap is 176mm.

[0022] In this embodiment, the gas sampling tube cap is integrally installed on the universal sample tube at the bottom, which is not shown in the figure. It is a universal sample collection absorption tube or sample bottle, and liquid absorption liquid is arranged in the universal sample tube.

[0023] The above is only a preferred embodiment of the utility model, and does not impose any formal restrictions on the structure of the utility model. The layout type and the number of uses of the utility model are not limited to this example, and can be optimized and selected according to the actual project. Any modification, equivalent change and decoration of the above embodiment based on the technical principle of the utility model that does not deviate from the content of the technical solution of the utility model is still within the scope of the technical solution of the utility model.

Claims

1. A gas sampling tube cap that prevents backflow and facilitates sampling and analysis, characterized in that: The invention comprises an air outlet (1), an expansion chamber (2), an air inlet (3), a connecting chamber (4), a cover body (5), an air inlet pipe (6) and an air inlet nozzle (7); the air outlet (1) is arranged at the top of the expansion chamber (2); the expansion chamber (2) is ellipsoidal in shape as a whole, and its bottom is connected to the connecting chamber (4) and the cover body (5) in sequence; the air inlet pipe (6) extends from the bottom to the top of the cover body (5) and is inserted in the center of the top plate of the connecting chamber (4) and is connected to the expansion chamber (2); a thread (51) is arranged on the inner side of the cover body (5), and a rubber gasket (52) is arranged on the top of the thread (51); the connecting chamber (4) is also provided with an air inlet (3) on the outer side, and the air inlet (3) is connected to the air inlet pipe (6) and the expansion chamber (2) in an openable and closed manner; the air inlet nozzle (7) is arranged at the bottom of the air inlet pipe (6).

2. A gas sampling tube cap for preventing backflow and facilitating sampling and analysis according to claim 1, characterized in that: The gas sampling tube cap is integrally mounted on the universal sample tube at the bottom, and liquid absorption liquid is arranged in the universal sample tube.

3. A gas sampling tube cap for preventing backflow and facilitating sampling and analysis according to claim 1, characterized in that: The air inlet (3) is a rotary openable and closable air inlet.

4. A gas sampling tube cap for preventing backflow and facilitating sampling and analysis according to claim 1, characterized in that: The air inlet (3) is arranged at the upper middle portion of the outer wall of the connecting cavity (4).

5. A gas sampling tube cap for preventing backflow and facilitating sampling and analysis according to claim 1, characterized in that: The outer diameter of the expansion cavity (2) is greater than the outer diameter of the cover body (5), and the outer diameter of the connecting cavity (4) is smaller than the outer diameter of the cover body (5).

6. A gas sampling tube cap for preventing backflow and facilitating sampling and analysis according to any one of claims 1 to 5, characterized in that: The air outlet (1), the expansion chamber (2), the air inlet (3), the connecting chamber (4), the cover body (5), the air inlet pipe (6) and the air inlet nozzle (7) are all made of plastic material.

7. A gas sampling tube cap for preventing backflow and facilitating sampling and analysis according to claim 6, characterized in that: The expansion chamber (2) is 30-40 mm high, and the cover body (5) is 8-12 mm high; the total height of the gas sampling tube cap is 150-180 mm.

8. A gas sampling tube cap for preventing backflow and facilitating sampling and analysis according to claim 7, characterized in that: The inner diameter of the air inlet nozzle (7) is 3 mm, the inner diameter of the air outlet (1) is 5 mm, and the outer diameters of the air outlet (1) and the air inlet (3) are both 7 mm.

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