Waste gas filtering device for ICP-MS

Abstract

The utility model relates to the technical field of ICP-MS (Inductively Coupled Plasma Mass Spectrometry) equipment, in particular to a waste gas filtering device for ICP-MS. The waste gas filtering device comprises an exhaust pipe, a backflow preventing mechanism, a waste gas leading-in pipe, a collecting tank, a waste gas leading-out pipe, a filtering mechanism and an exhaust fan which are sequentially connected, and the backflow preventing mechanism comprises a conical air inlet pipe, a connecting pipe, a conical air outlet pipe, a fixing frame, a spring and a sealing ball body. The filtering mechanism comprises a filtering box, the upper end of the filtering box is detachably connected with a filtering cover, a filtering material is arranged in the filtering box, sliding assemblies are arranged on the filtering box and the waste gas leading-out pipe, and the waste gas leading-out pipe is a square pipe. The filtering effect is greatly improved, and the environmental pollution is reduced; an anti-backflow mechanism is arranged to prevent waste gas; the filtering mechanism is arranged to further filter waste gas, pollution is prevented, and the filtering mechanism can be slidably detached and is convenient to replace.

Description

Technical Field

[0001] The utility model relates to the technical field of ICP-MS equipment, in particular to an ICP-MS waste gas filtering device. Background Art

[0002] ICP-MS stands for Inductively Coupled Plasma Mass Spectrometer, which is a highly sensitive and selective analytical technology widely used in environmental monitoring, food safety, drug testing and other fields. It is an analytical instrument that combines ICP technology and mass spectrometry. ICP-MS is mainly composed of injection system, ion source, cone, ion focusing system, collision reaction cell, mass analyzer, detector, vacuum system, cooling system, gas pipeline, computer system and other parts. Regardless of the injection system, the generation, introduction or transmission of the ion source requires the participation of high-pressure gas, which will produce a large amount of gas; at the same time, a certain amount of acid and alkali will be generated during the sample analysis. Corrosive gas. The existing gas treatment methods of ICP-MS in China mostly use the method of directly discharging into the atmosphere without relevant treatment. In the generation and transportation of the sampling system and ion source, high-pressure inert gases such as argon are not treated, and the gas in the gas cylinder is directly discharged into the exhaust gas after the work is completed. The exhaust gas generated by ignition and combustion when the mass spectrometer is working, the acid and alkali corrosive gases and impurity dust generated by sample testing are usually discharged directly through the exhaust port, affecting the surrounding environment. Sometimes, when the exhaust port fails, it makes it difficult to remove, and even the exhaust gas backflows, polluting the laboratory environment. Therefore, it is necessary to filter the exhaust gas generated during use before discharging it. Utility Model Content

[0003] In order to solve the problems existing in the prior art, the utility model provides an ICP-MS exhaust gas filtering device to solve the problem of direct discharge of untreated exhaust gas.

[0004] To solve the above problems, the technical solution of the utility model is as follows: an exhaust gas filtering device for ICP-MS, comprising an exhaust pipe, an anti-backflow mechanism, an exhaust gas inlet pipe, a collecting tank, an exhaust gas outlet pipe, a filtering mechanism, and an exhaust fan connected in sequence, the exhaust pipe is connected to the ICP-MS, the collecting tank comprises a sealing cover sealedly connected to the exhaust gas inlet pipe and the exhaust gas outlet pipe, the sealing cover is detachably connected to a tank body, a filtering liquid is provided in the tank body, and the filtering mechanism is detachably connected to the exhaust gas outlet pipe.

[0005] Furthermore, the anti-backflow mechanism includes a conical air inlet pipe, a connecting pipe, and a conical air outlet pipe connected to the exhaust pipe. A fixing frame is connected to the conical air inlet pipe, and the fixing frame is connected to a spring passing through the connecting pipe. One end of the spring is connected to a sealing ball.

[0006] Furthermore, the fixing frame includes a fixing plate connected to the spring, and a plurality of connecting rods are provided between the fixing plate and the conical air inlet pipe.

[0007] Furthermore, the filtered liquid is water.

[0008] Furthermore, the filtering mechanism comprises a filter box, the upper end of which is detachably connected to a filter cover, a filter material is arranged in the filter box, and a sliding assembly is arranged on the filter box and the exhaust gas outlet pipe.

[0009] Furthermore, the exhaust gas outlet pipe is a square pipe, and a slot adapted to the filter box for the filter box to pass through is provided on the upper surface of the exhaust gas outlet pipe.

[0010] Furthermore, the sliding assembly includes convex strips arranged on both side walls of the filter box, and also includes sliding grooves arranged on both side walls of the exhaust gas outlet pipe and adapted to the convex strips.

[0011] Furthermore, a groove corresponding to the slot is provided on the lower surface of the exhaust gas outlet pipe.

[0012] Furthermore, a handle is provided on the filter cover.

[0013] Furthermore, the filter material is an air filter element.

[0014] Compared with the prior art, the utility model has the following beneficial effects: a collection tank is provided to use water to collect a large amount of nitric acid, argon, impurity dust, etc. in the exhaust gas, which greatly improves the filtering effect and reduces environmental pollution; an anti-backflow mechanism is provided to prevent exhaust gas; a filtering mechanism is provided to further filter the exhaust gas to prevent pollution, and the filtering mechanism can be slidably disassembled for easy replacement. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the structure of the filter mechanism of the utility model;

[0017] Figure 3 It is a left-side structural schematic diagram of the fixing frame of the utility model.

[0018] Description of the drawings: 1 exhaust pipe, 2 exhaust gas inlet pipe, 3 collecting tank, 301 sealing cover, 302 tank body, 303 filtering liquid, 4 exhaust gas outlet pipe, 5 filtering mechanism, 6 exhaust fan, 7 conical air inlet pipe, 8 connecting pipe, 9 conical air outlet pipe, 10 fixing frame, 101 fixing plate, 102 connecting rod, 11 spring, 12 sealing ball, 13 filter box, 14 filter cover, 15 handle, 16 convex strip, 17 sliding groove, 18 groove. DETAILED DESCRIPTION

[0019] like Figure 1 As shown, an exhaust gas filtering device for ICP-MS includes an exhaust pipe 1, an anti-backflow mechanism, an exhaust gas inlet pipe 2, a collecting tank 3, an exhaust gas outlet pipe 4, a filtering mechanism 5, and an exhaust fan 6 connected in sequence. The exhaust pipe 1 is connected to the ICP-MS, and the collecting tank 3 includes a sealing cover 301 sealedly connected to the exhaust gas inlet pipe 2 and the exhaust gas outlet pipe 4. The sealing cover 301 is detachably connected to a tank body 302, and a filtering liquid 303 is arranged in the tank body 302. The best acid medium for ICP-MS analysis is nitric acid. ICP-MS usually uses argon as a carrier gas to send the sample into the plasma for ionization. Therefore, the exhaust gas contains nitric acid and argon. The filtering liquid 303 can be water or an alkaline aqueous solution.

[0020] The anti-backflow mechanism includes a conical air inlet pipe 7, a connecting pipe 8, and a conical air outlet pipe 9 connected to the exhaust pipe 1. A fixing frame 10 is connected to the conical air inlet pipe 7. The fixing frame 10 is connected to a spring 11 passing through the connecting pipe 8. A sealing ball 12 is connected to one end of the spring 11.

[0021] like Figure 3 As shown, the fixing frame 10 includes a fixing plate 101 connected to the spring 11 , and a plurality of connecting rods 102 are provided between the fixing plate 101 and the conical air inlet pipe 7 .

[0022] like Figure 2 As shown, the filtering mechanism includes a filter box 13, and a filter cover 14 is detachably connected to the upper end of the filter box 13 to facilitate the replacement of filter materials. Filter materials are arranged in the filter box 13, and the filter materials can be air filter elements. A handle 15 is provided on the filter cover 14 to facilitate grasping the filter cover for sliding replacement. A sliding component is provided on the filter box 13 and the exhaust gas outlet pipe 4.

[0023] The exhaust gas outlet pipe 4 is a square pipe, and a slot matching the filter box 13 for the filter box 13 to pass through is provided on the upper surface of the exhaust gas outlet pipe 4, and a groove 18 corresponding to the slot is provided on the lower surface of the exhaust gas outlet pipe 4.

[0024] The sliding assembly includes convex strips 16 arranged on both side walls of the filter box 13 , and also includes sliding grooves 17 arranged on both side walls of the exhaust gas outlet pipe 4 and matched with the convex strips 16 .

[0025] When in use, the exhaust gas is blown into the exhaust pipe 1 by the air compressor of the ICP-MS with argon gas, and the exhaust fan 6 can be turned on simultaneously to ensure the gas flow. When the exhaust gas pressure is greater than the elastic force of the spring 11, the sealing ball 12 leaves the conical air outlet pipe 9 to the right, otherwise it blocks the conical air outlet pipe 9 to prevent the exhaust gas from flowing back. The exhaust gas enters the collection tank 3 through the exhaust gas inlet pipe 2, and the filtering liquid 303 filters out nitric acid, impurity dust, and a small amount of argon in the exhaust gas. The exhaust gas passing through the filtering liquid 303 enters the filtering mechanism 5 through the exhaust gas outlet pipe 4. The filter material can be further filtered by an air filter element, which greatly reduces the toxic and harmful substances in the exhaust gas. Most of the exhaust gas is argon, and the exhaust gas can be recycled. The overall structure of the device is simple, which improves the filtering effect and greatly reduces environmental pollution.

[0026] The above specific implementation methods are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model is described in detail with reference to examples, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. An ICP-MS exhaust gas filtration device, characterized in that: It includes an exhaust pipe, an anti-backflow mechanism, an exhaust gas inlet pipe, a collecting tank, an exhaust gas outlet pipe, a filtering mechanism, and an exhaust fan which are connected in sequence. The exhaust pipe is connected to the ICP-MS. The collecting tank includes a sealing cover which is sealed and connected to the exhaust gas inlet pipe and the exhaust gas outlet pipe. The sealing cover is detachably connected to a tank body, in which a filtering liquid is arranged. The filtering mechanism is detachably connected to the exhaust gas outlet pipe.

2. The exhaust gas filtering device according to claim 1, characterized in that: The anti-backflow mechanism includes a conical air inlet pipe, a connecting pipe and a conical air outlet pipe connected to the exhaust pipe. A fixing frame is connected to the conical air inlet pipe, and the fixing frame is connected to a spring passing through the connecting pipe. One end of the spring is connected to a sealing ball.

3. The exhaust gas filtering device according to claim 2, characterized in that: The fixing frame comprises a fixing plate connected to a spring, and a plurality of connecting rods are arranged between the fixing plate and the conical air inlet pipe.

4. The exhaust gas filtering device according to claim 3, characterized in that: The filtered liquid is water.

5. The exhaust gas filtering device according to claim 1, characterized in that: The filter mechanism comprises a filter box, the upper end of which is detachably connected with a filter cover, a filter material is arranged in the filter box, and a sliding assembly is arranged on the filter box and the exhaust gas outlet pipe.

6. The exhaust gas filtering device according to claim 5, characterized in that: The exhaust gas outlet pipe is a square pipe, and a slot adapted to the filter box and for the filter box to pass through is arranged on the upper surface of the exhaust gas outlet pipe.

7. The exhaust gas filtering device according to claim 6, characterized in that: The sliding assembly comprises convex strips arranged on both side walls of the filter box, and also comprises sliding grooves arranged on both side walls of the exhaust gas outlet pipe and matched with the convex strips.

8. The exhaust gas filtering device according to claim 7, characterized in that: A groove corresponding to the slot is arranged on the lower surface of the exhaust gas outlet pipe.

9. The exhaust gas filtering device according to claim 5, characterized in that: A handle is provided on the filter cover.

10. The exhaust gas filtering device according to claim 5, characterized in that: The filter material is an air filter element.

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