Chemical gas sealing and sampling device

Abstract

The utility model discloses a chemical gas sealing sampling device, which comprises a sampling pipe body, a detection seat, a screw rod, a gas inlet guide head and a moving plug plate, the detection seat is fixedly arranged at the top end of the sampling pipe body, and a detection probe pipe connected with detection equipment is arranged on the surface of the detection seat. The screw rod is rotatably mounted on the inner side of the detection seat, one end of the screw rod is fixedly connected with a crank, the surface of the moving plug plate is provided with a screw sleeve which sleeves the surface of the screw rod in a threaded manner, the air inlet guide head is fixedly connected with one end of the sampling pipe body, the surface of the moving plug plate is provided with a one-way valve group, and the inner side of the air inlet guide head is provided with an air inlet flow channel and a first valve bead; and the inner side of the air inlet guide head is fixedly connected with a first spring. According to the utility model, the lead screw is manually driven to rotate so as to control the reciprocating motion of the moving plug plate, exhaust and sampling suction work, and the moving plug plate is close to the air inlet guide head in the sampling pipe body so as to extrude foreign gas between opposite surfaces, so that the purity of sample gas in the process of entering a detection procedure is ensured.

Description

Technical Field

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

[0002] Chemical gas sealing sampling is an important operation used to collect gas samples generated in the chemical process for analysis or monitoring. The sampling tube method is a common chemical gas sealing sampling method: a sampling tube is set in the chemical equipment or pipeline, and the gas sample is introduced into the sampling tube by opening the valve or other means, and then the valve is closed to seal the sampling tube for subsequent analysis or monitoring. This method is suitable for situations where the source of the gas is accurately controlled. When conducting gas sealing sampling, it is necessary to pay attention to the selection of appropriate sampling methods and equipment to ensure the accuracy and representativeness of the sampling. At the same time, attention should be paid to safety measures during the sampling process to prevent leaks or other unexpected situations.

[0003] During use, the sampling tube needs to be evacuated or filled with protective gas in advance through a negative pressure pump or other equipment to avoid air retention leading to sample contamination and inconvenience in use. In view of this, the existing problems are studied and improved, and a chemical gas sealed sampling device is provided to solve the current problems, aiming to achieve the purpose of solving the problems and improving the practical value through this technology. Utility Model Content

[0004] The utility model aims to solve one of the technical problems existing in the prior art or related technology.

[0005] To this end, the technical solution adopted by the utility model is: a chemical gas sealed sampling device, comprising: a sampling tube body, a detection seat, a screw rod, an air intake guide head and a moving plug plate, the detection seat is fixedly installed on the top of the sampling tube body, and the surface of the detection seat is provided with a detection probe for connecting to the detection equipment, the screw rod is rotatably installed on the inner side of the detection seat and one end is fixedly connected to a crank, the surface of the moving plug plate is provided with a thread sleeve threadedly sleeved on the surface of the screw rod, the air intake guide head is fixedly connected to one end of the sampling tube body, the surface of the moving plug plate is provided with a one-way valve group, the inner side of the air intake guide head is provided with an air intake flow channel and a first valve ball, the inner side of the air intake guide head is fixedly connected with a first spring, and the end of the first spring away from the sampling tube body is fixedly connected with the first valve ball, the surface of the one-way valve group is respectively provided with exhaust holes and exhaust valve holes located on the upper and lower sides of the moving plug plate, the inner side of the one-way valve group is fixedly installed with a second spring and the end of the second spring opposite to the air intake guide head is fixedly installed with a second valve ball.

[0006] In a preferred example, the utility model can be further configured as follows: one end of the screw rod is rotatably installed on the inner side of the sampling tube body and close to the end of the air inlet guide head, and the movable plug plate is slidably installed on the inner side of the sampling tube body and the outer periphery is sealed against the inner wall of the sampling tube body.

[0007] In a preferred example, the utility model can be further configured as follows: the sampling tube body, the screw rod and the air intake guide head are located on the same axis, and the threaded sleeve is a threaded sleeve structure and is adapted to the threaded teeth on the surface of the screw rod.

[0008] In a preferred example, the utility model can be further configured as follows: the intake air passage passes through the inner side of the intake guide head, the valve hole is an annular spherical structure and is adapted to the size of the first valve ball, and the first valve ball is arranged in opposite directions to the valve hole.

[0009] In a preferred example, the utility model can be further configured as follows: the upper and lower ends of the one-way valve group penetrate the surface of the moving plug plate, and the exhaust valve hole is opposite to the side of the intake guide head, the exhaust valve hole and the exhaust hole are connected to each other through the inner cavity of the one-way valve group, and the second spring and the second valve ball are located inside the one-way valve group.

[0010] In a preferred example, the utility model can be further configured as follows: an annular spherical chamfer is provided on the top of the exhaust valve hole and is matched with the size of the second valve bead, and the second valve bead is arranged facing the exhaust valve hole port.

[0011] The beneficial effects achieved by the utility model are:

[0012] 1. In the utility model, a novel integrated gas sampling and detection structure is provided, and the reciprocating motion of the moving plug plate is controlled by rotating the screw manually to perform exhaust and sampling air suction operations. The moving plug plate approaches the air inlet guide head inside the sampling tube body to squeeze out the impurity gas between the opposite surfaces, and the negative pressure between the air inlet guide head and the moving plug plate is used to introduce the target gas from the air inlet guide head port during the upward motion of the moving plug plate for sampling. The sampled gas is discharged during the downward motion of the moving plug plate again to ensure the purity of the sample gas entering the detection procedure.

[0013] 2. In the utility model, the one-way derivation of the airflow is performed by controlling the air inlet guide head and the internal valve ball of the one-way valve group, and the sampling gas is sealed after entering the sampling tube body, thereby improving the sealing effect of the gas sampling device. It is suitable for situations where samples need to be stored for a long time or for on-site analysis, and can maintain the integrity of the samples. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0015] Figure 2This is a schematic diagram of the overall cross-sectional structure of an embodiment of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of a moving plug plate according to an embodiment of the utility model;

[0017] Figure 4 This is a schematic diagram of the cross-sectional structure of an air intake guide head according to an embodiment of the utility model;

[0018] Figure 5 The figure is a schematic diagram of the cross-sectional structure of a one-way valve group according to an embodiment of the utility model.

[0019] Reference numerals:

[0020] 1. Sampling tube body; 2. Detection seat; 3. Screw; 4. Air inlet guide head; 5. Motion plug plate;

[0021] 21. Detection probe; 31. Crank; 41. Intake air passage; 42. Valve hole; 43. First valve ball; 44. First spring; 51. Thread sleeve; 52. One-way valve group; 521. Exhaust hole; 522. Exhaust valve hole; 523. Second spring; 524. Second valve ball. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model is further described in detail below in combination with specific implementation methods and with reference to the accompanying drawings. It should be noted that the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

[0023] A chemical gas sealed sampling device provided by some embodiments of the utility model is described below in conjunction with the accompanying drawings.

[0024] Combination Figure 1-5As shown, the utility model provides a sealed sampling device for chemical gas, comprising: a sampling tube body 1, a detection seat 2, a screw rod 3, an air intake guide head 4 and a moving plug plate 5, the detection seat 2 is fixedly installed on the top of the sampling tube body 1, and the surface of the detection seat 2 is provided with a detection probe 21 for connecting with a detection device, the screw rod 3 is rotatably installed on the inner side of the detection seat 2 and one end is fixedly connected with a crank 31, the surface of the moving plug plate 5 is provided with a threaded sleeve 51 threadedly sleeved on the surface of the screw rod 3, the air intake guide head 4 is fixedly connected to one end of the sampling tube body 1, and the moving plug plate 5 is provided with a one-way valve group 52 on the surface, an intake flow channel 41 and a first valve ball 43 are opened on the inner side of the intake guide head 4, a first spring 44 is fixedly connected to the inner side of the intake guide head 4, and the first valve ball 43 is fixedly connected to the end of the first spring 44 away from the sampling tube body 1, and an exhaust hole 521 and an exhaust valve hole 522 are respectively provided on the surface of the one-way valve group 52 on the upper and lower sides of the moving plug plate 5, a second spring 523 is fixedly installed on the inner side of the one-way valve group 52, and a second valve ball 524 is fixedly installed on the end of the second spring 523 opposite to the intake guide head 4.

[0025] In this embodiment, one end of the screw rod 3 is rotatably mounted inside the sampling tube body 1 and close to the end of the air inlet guide head 4, and the movable plug plate 5 is slidably mounted inside the sampling tube body 1 and its outer periphery is sealed against the inner wall of the sampling tube body 1.

[0026] Specifically, the moving plug plate 5 is driven to slide inside the sampling tube body 1 by the rotation of the screw rod 3 .

[0027] In this embodiment, the sampling tube body 1 , the screw rod 3 and the air inlet guide head 4 are located on the same axis, and the threaded sleeve 51 is a threaded sleeve structure and is adapted to the threaded teeth on the surface of the screw rod 3 .

[0028] In this embodiment, the intake flow passage 41 passes through the inner side of the intake guide 4 , the valve hole 42 is an annular spherical structure and is matched with the first valve ball 43 in size, and the first valve ball 43 and the valve hole 42 are arranged in opposite directions.

[0029] Specifically, the intake passage 41 is closed and locked when the first valve ball 43 abuts against the valve hole 42 , and the intake passage 41 is opened by the retreat of the first valve ball 43 and the first spring 44 .

[0030] In this embodiment, the upper and lower ends of the one-way valve group 52 pass through the surface of the moving plug plate 5, and the exhaust valve hole 522 is opposite to the side of the intake guide head 4. The exhaust valve hole 522 and the exhaust hole 521 are connected to each other through the inner cavity of the one-way valve group 52, and the second spring 523 and the second valve ball 524 are located inside the one-way valve group 52.

[0031] In this embodiment, an annular spherical chamfer is provided at the top of the exhaust valve hole 522 and is matched with the size of the second valve ball 524 . The second valve ball 524 is arranged opposite to the end of the exhaust valve hole 522 .

[0032] Specifically, the positive pressure inside the sampling tube body 1 causes the gas to push the exhaust valve hole 522 to separate from the second valve bead 524, so that the gas escapes through the top of the moving plug plate 5, thereby performing a one-way gas extraction.

[0033] The working principle and use process of this utility model:

[0034] When the gas sampling device is used, the crank 31 is manually controlled to rotate so as to drive the screw rod 3 to rotate to control the reciprocating motion of the moving plug plate 5 to perform exhaust and sampling air inhalation. In the initial stage, the screw rod 3 is used to rotate in the opposite direction to make the moving plug plate 5 approach the air inlet guide head 4 inside the sampling tube body 1 to squeeze out the impurity gas between the opposite surfaces. The positive pressure inside the sampling tube body 1 causes the gas to push the exhaust valve hole 522 to separate from the second valve bead 524, so that the gas escapes from the top of the moving plug plate 5 to avoid the internal air from interfering with the sample. In the upward movement of the moving plug plate 5, the air inlet guide head 4 and the moving plug plate 5 are used to The negative pressure introduces the target gas from the port of the air inlet guide head 4. The target gas causes the first valve ball 43 to separate from the valve hole 42 under the negative pressure suction, and enters the sampling tube body 1 through the inside of the air inlet flow channel 41 for sampling. At the same time, the upward movement of the moving plug plate 5 causes the impurity gas above the moving plug plate 5 in the sampling tube body 1 to be discharged. The detection probe 21 is connected to the detection equipment or a detection test paper or a detection probe structure is set at the detection probe 21. During the downward movement of the moving plug plate 5 again, the sampled gas is released and contacts with the detection probe, thereby ensuring the purity of the sample gas entering the detection procedure.

[0035] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A chemical gas sealed sampling device, characterized in that: include: A sampling tube body (1), a detection seat (2), a screw rod (3), an air intake guide head (4) and a movable plug plate (5), wherein the detection seat (2) is fixedly mounted on the top of the sampling tube body (1), and the surface of the detection seat (2) is provided with a detection probe (21) for connecting to a detection device, the screw rod (3) is rotatably mounted on the inner side of the detection seat (2) and one end of the screw rod is fixedly connected to a crank (31), the surface of the movable plug plate (5) is provided with a threaded sleeve (51) threadedly sleeved on the surface of the screw rod (3), the air intake guide head (4) is fixedly connected to one end of the sampling tube body (1), and the surface of the movable plug plate (5) is provided with a one-way valve group (52) The inner side of the air intake guide (4) is provided with an air intake passage (41) and a first valve ball (43); the inner side of the air intake guide (4) is fixedly connected with a first spring (44); the end of the first spring (44) away from the sampling tube body (1) is fixedly connected with the first valve ball (43); the surface of the one-way valve group (52) is respectively provided with an exhaust hole (521) and an exhaust valve hole (522) located at the upper and lower sides of the moving plug plate (5); the inner side of the one-way valve group (52) is fixedly installed with a second spring (523); and the end of the second spring (523) opposite to the air intake guide (4) is fixedly installed with a second valve ball (524).

2. A chemical gas sealing sampling device according to claim 1, characterized in that: One end of the screw rod (3) is rotatably mounted on the inner side of the sampling tube body (1) and close to the end of the air inlet guide head (4); the movable plug plate (5) is slidably mounted on the inner side of the sampling tube body (1) and its outer periphery is in abutment and sealing contact with the inner wall of the sampling tube body (1).

3. A chemical gas sealing sampling device according to claim 1, characterized in that: The sampling tube body (1), the screw rod (3) and the air intake guide head (4) are located on the same axis, and the threaded sleeve (51) is a threaded sleeve structure and is adapted to the threaded teeth on the surface of the screw rod (3).

4. A chemical gas sealed sampling device according to claim 1, characterized in that: The intake flow passage (41) passes through the inner side of the intake guide head (4); the valve hole (42) is an annular spherical structure and is matched in size to the first valve ball (43); the first valve ball (43) and the valve hole (42) are arranged in opposite directions.

5. A chemical gas sealed sampling device according to claim 1, characterized in that: The upper and lower ends of the one-way valve group (52) penetrate the surface of the moving plug plate (5), and the exhaust valve hole (522) faces one side of the intake guide head (4). The exhaust valve hole (522) and the exhaust hole (521) are connected to each other through the inner cavity of the one-way valve group (52), and the second spring (523) and the second valve ball (524) are located inside the one-way valve group (52).

6. A chemical gas sealing sampling device according to claim 1, characterized in that: The top end of the exhaust valve hole (522) is provided with an annular spherical chamfer and is matched in size to the second valve bead (524), and the second valve bead (524) is arranged facing the port of the exhaust valve hole (522).

Images