Atmospheric xylene adsorption tube

Abstract

The atmospheric xylene adsorption tube comprises a tube body, an adsorption layer is arranged in the middle of the tube body, one end of the tube body is an inlet end, and the other end of the tube body is an outlet end; a two-way end cover communicating the inside and the outside of the pipe body is mounted at the inlet end and closes the inlet end through a closing nut in threaded connection with the upper part of the two-way end cover; a one-way end cover with air flowing from inside to outside is mounted at the outlet end, the outlet end is closed by the one-way end cover in a natural state, and the outlet end is opened by the one-way end cover when negative pressure is applied to the outside. The two ends of the pipe body are respectively provided with the two-way end cover and the one-way end cover which are obviously different in appearance, so that a user can quickly distinguish the two-way end cover and the one-way end cover, misrecognition is avoided, and labeling for distinguishing is not needed. The two-way end cover is closed through the closing nut, the one-way end cover is closed through the movable cover of the one-way valve structure, the one-way end cover is connected with a negative pressure device during use, the closing nut is taken down for use, and the use process is simple and convenient.

Description

Technical Field

[0001] The utility model relates to the field of adsorption tubes for atmosphere monitoring, in particular to an atmospheric xylene adsorption tube. Background Art

[0002] When detecting the xylene content in the air, it is often necessary to use an adsorption tube to adsorb and sample the air. The existing adsorption tube is made of glass and has an adsorption layer encapsulated inside. The two ends of the adsorption tube are sealed with glass when leaving the factory. When in use, a cutting tool is needed to cut off the two ends of the adsorption tube, so that the two ends are connected, and the air can pass through the adsorption tube and be fixed on the adsorption layer. The cutting process requires a specific cutting tool. After the glass tube is rotated several times in the cutting tool, both hands need to use force to break it. The process is more troublesome and has certain risks. In addition, when in use, one end of the adsorption tube is exposed to the air, and the other end is connected to a negative pressure device, which makes the adsorption tube directional and needs to be labeled respectively to facilitate the subsequent dissociation process. Therefore, the use process of the adsorption tube is more cumbersome and complicated, and it is easy to misread the label and cause errors. Utility Model Content

[0003] The purpose of the present application is to provide an atmospheric xylene adsorption tube, aiming to solve the problems existing in the prior art.

[0004] An embodiment of the present application provides an atmospheric xylene adsorption tube, including a tube body, an adsorption layer is arranged in the middle of the tube body, one end of the tube body is an inlet end, and the other end is an outlet end; a two-way end cover connecting the inside and outside of the tube body is installed at the inlet end, and the two-way end cover closes the inlet end through a closing nut threadedly connected above; a unidirectional end cover with the air flowing direction from the inside of the tube to the outside of the tube is installed at the outlet end, under natural conditions, the unidirectional end cover closes the outlet end, and when negative pressure is applied from the outside, the unidirectional end cover opens the outlet end.

[0005] Furthermore, the material of the adsorption layer is activated carbon.

[0006] Furthermore, an inlet end plug is installed on the tube body at the entrance end, a core tube is fixed in the center of the inlet end plug, the core tube is fixedly connected to the inlet end plug and the two-way end cover, an air flow channel is opened in the core tube, and the internal air of the tube body and the external air of the tube body are connected through the air flow channel.

[0007] Furthermore, the lower end of the core tube passes through from below the inlet end plug, and the upper end of the core tube passes through from above the two-way end cover; the air flow channel has air ports on the lower end side wall and the upper end side wall respectively; the upper end surface of the core tube is provided with a thread, and the upper end of the core tube is threadedly connected with the closing nut, and the air port above the air flow channel is blocked by the closing nut.

[0008] Furthermore, an outlet end plug is installed on the pipe body at the outlet end, and the outlet end plug is fixedly connected to the one-way end cover. A movable cavity is opened in the center of the one-way end cover, and a one-way valve is installed on the outlet end plug in the movable cavity.

[0009] Furthermore, an air hole is opened in the center of the outlet end plug, the air hole is connected to the movable cavity, springs are installed in the outlet end plugs on both sides of the air hole, and the other end of the spring is connected to the movable cover. When the spring is in the natural state, the movable cover rests on the air hole.

[0010] Furthermore, the air hole forms a protrusion on the lower surface of the outlet end plug, and grooves are set on the lower surface of the outlet end plug on both sides of the air hole. The upper surface of the movable cover is concave to match the shape of the lower surface of the outlet end plug.

[0011] Furthermore, a thread is arranged on the outer surface of the one-way end cover.

[0012] The beneficial effects of the utility model are as follows: the two ends of the pipe body of the utility model are respectively installed with a bidirectional end cap and a one-way end cap with obviously different appearances, the outer periphery of the bidirectional end cap is smooth and has a closing nut, and the outer periphery of the one-way end cap is provided with a thread, so that the user can quickly distinguish them without misidentification and without labeling. The bidirectional end cap is closed by the closing nut, and the one-way end cap is closed by the movable cover of the one-way valve structure. When in use, the one-way end cap is connected to the negative pressure device, and the closing nut is removed for use, and the use process is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0014] Figure 2 This is a schematic diagram of the structure of the entry end.

[0015] Figure 3 This is a schematic diagram of the structure of the outlet end.

[0016] In the figure:

[0017] 1. Tube body; 2. Adsorption layer; 3. Bidirectional end cap; 4. Closing nut; 5. Inlet end plug; 6. Core tube; 7. Air flow channel; 8. Air port; 9. One-way end cap; 10. Outlet end plug; 11. Movable cavity; 12. Movable cover; 13. Air hole; 14. Spring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0019] like Figure 1 The illustrated atmospheric xylene adsorption tube comprises a tube body 1, which is made of transparent glass. An adsorption layer 2 is arranged in the middle of the tube body 1, which is made of activated carbon and can adsorb and fix xylene in the atmosphere. One end of the tube body 1 is an inlet end, and the other end is an outlet end.

[0020] A two-way end cap 3 is installed at the inlet end to connect the inside and outside of the pipe body 1. The two-way end cap 3 is closed by a closing nut 4 threadedly connected above. Figure 2 As shown, an inlet plug 5 is installed on the pipe body 1 at the entrance end, and a core tube 6 is fixed in the center of the inlet plug 5. The core tube 6 is fixedly connected to the inlet plug 5 and the bidirectional end cover 3. The lower end of the core tube 6 passes through the bottom of the inlet plug 5, and the upper end of the core tube 6 passes through the top of the bidirectional end cover 3. An air flow channel 7 is provided in the core tube 6. The air flow channel 7 has air ports 8 respectively provided on the lower side wall and the upper side wall, so that the internal air of the pipe body 1 and the external air of the pipe body 1 are connected through the air flow channel 7. The upper side surface of the core tube 6 exposed above the bidirectional end cover 3 is provided with a thread, and the upper end of the core tube 6 is threadedly connected with the closing nut 4. After the closing nut 4 is screwed on, the air port 8 above the air flow channel 7 is blocked by the closing nut 4, so that the air is isolated and no longer connected. After the closing nut 4 is removed, the air port 8 is released, and the air inside and outside the pipe body 1 can be connected through the air flow channel 7.

[0021] A one-way end cap 9 is installed at the outlet end so that the air flows from the inside of the tube to the outside of the tube. In a natural state, the one-way end cap 9 closes the outlet end. When negative pressure is applied from the outside, the one-way end cap 9 opens the outlet end. Figure 3 As shown, an outlet plug 10 is installed on the pipe body 1 at the outlet end, and the outlet plug 10 is fixedly connected to the one-way end cover 9. A movable cavity 11 is opened in the center of the one-way end cover 9, and a one-way valve is installed on the outlet plug 10 in the movable cavity 11, which is a movable cover 12 in this embodiment.

[0022] An air hole 13 is provided in the center of the outlet end plug 10, and the air hole 13 is connected to the movable cavity 11. Springs 14 are installed in the outlet end plug 10 on both sides of the air hole 13, and the other end of the spring 14 is connected to the movable cover 12. When the spring 14 is in a natural state, the movable cover 12 is against the air hole 13. When subjected to external negative pressure, the movable cover 12 moves downward to expose the air hole 13, thereby realizing a unidirectional flow of air in the tube body 1 through the air hole 13 and the movable cavity 11 in sequence.

[0023] The air hole 13 forms a protrusion on the lower surface of the outlet end plug 10, and grooves are set on the lower surface of the outlet end plug 10 on both sides of the air hole 13. The upper surface of the movable cover 12 is concave to match the shape of the lower surface of the outlet end plug 10. In order to further increase the sealing performance, a sealing gasket can be installed on the surface where the movable cover 12 contacts the air hole 13.

[0024] When the utility model leaves the factory, the inlet end is provided with a closing nut 4, and the outlet end is automatically closed by a spring 14, thereby isolating the inside of the tube body 1 from the external environment. When in use, the one-way end cap 9 at the outlet end is connected to the negative pressure device through a thread, the closing nut 4 is removed, and the negative pressure device is opened to draw negative pressure on the tube body 1, thereby forming an air cycle in which external air enters the tube body 1 through the inlet end, passes through the adsorption layer 2 in the tube body 1, and then leaves from the outlet end, so that the xylene in the atmosphere is fully fixed on the adsorption layer 2. Since the structures of the inlet end and the outlet end are obviously different, the operator can quickly distinguish them, avoiding the operation process of glass cutting and labeling.

[0025] During the dissociation process, a gas chromatography detection device is used to perform qualitative and quantitative detection on the dissociated components in the same manner as in the prior art to obtain the xylene content in the atmosphere.

[0026] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. An atmospheric xylene adsorption tube, characterized in that: It includes a tube body, the middle part of which is provided with an adsorption layer, one end of the tube body is an inlet end, and the other end is an outlet end; a two-way end cover connecting the inside and outside of the tube body is installed at the inlet end, and the two-way end cover closes the inlet end through a closing nut threadedly connected above; a one-way end cover with the air flowing direction from the inside of the tube to the outside of the tube is installed at the outlet end, under natural conditions, the one-way end cover closes the outlet end, and when negative pressure is applied from the outside, the one-way end cover opens the outlet end.

2. The atmospheric xylene adsorption tube according to claim 1, characterized in that: The material of the adsorption layer is activated carbon.

3. The atmospheric xylene adsorption tube according to claim 1, characterized in that: An inlet plug is installed on the tube body at the entry end, a core tube is fixed in the center of the inlet plug, the core tube is fixedly connected to the inlet plug and the two-way end cover, an air flow channel is opened in the core tube, and the internal air of the tube body and the external air of the tube body are connected through the air flow channel.

4. The atmospheric xylene adsorption tube according to claim 3, characterized in that: The lower end of the core tube passes through below the inlet end plug, and the upper end of the core tube passes through above the two-way end cover; the air flow channel has air ports on the lower end side wall and the upper end side wall respectively; the upper end surface of the core tube is provided with a thread, and the upper end of the core tube is threadedly connected with a closing nut, and the air port above the air flow channel is blocked by the closing nut.

5. The atmospheric xylene adsorption tube according to claim 1, characterized in that: An outlet plug is installed on the pipe body at the outlet end, and the outlet plug is fixedly connected to the one-way end cover. A movable cavity is opened in the center of the one-way end cover, and a one-way valve is installed on the outlet plug in the movable cavity.

6. The atmospheric xylene adsorption tube according to claim 5, characterized in that: An air hole is provided in the center of the outlet end plug, which is connected to the movable cavity. Springs are installed in the outlet end plugs on both sides of the air hole, and the other end of the spring is connected to the movable cover. When the spring is in a natural state, the movable cover rests on the air hole.

7. The atmospheric xylene adsorption tube according to claim 6, characterized in that: The air hole forms a bulge on the lower surface of the outlet end plug, and grooves are arranged on the lower surface of the outlet end plug on both sides of the air hole. The upper surface of the movable cover is concave to match the shape of the lower surface of the outlet end plug.

8. The atmospheric xylene adsorption tube according to claim 1, characterized in that: The outer surface of the one-way end cover is provided with threads.

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