Method and device for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide

Abstract

The invention relates to the technical field of chemical industry, and specifically provides a method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, comprising the following steps: passing a carrier gas containing a preset volume of sample gas through a chromatographic column I, a chromatographic column II and a chromatographic column III in sequence, wherein the chromatographic column I contains graphitized carbon black coated with 1% polyethylene glycol nitrobenzene stationary liquid, the chromatographic column II is built with a 5A molecular sieve, and the chromatographic column III is built with a PorapaQ high molecular polymer; after the carrier gas containing the sample gas completely passes through the chromatographic column III, the perfluoroisobutyronitrile in the chromatographic column I, the oxygen in the chromatographic column II and the carbon dioxide in the chromatographic column III are purged to corresponding detectors in sequence through the carrier gas, so as to detect the contents of perfluoroisobutyronitrile, oxygen and carbon dioxide; the invention can accurately quantify oxygen and perfluoroisobutyronitrile in carbon dioxide.

Description

Technical Field

[0001] The invention relates to the technical field of chemical engineering, and in particular to a method and a device for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide. Background Art

[0002] Carbon dioxide is well known to the world as a greenhouse gas that affects the climate, but it is also an important carbon resource and is widely used in many fields such as chemical industry, machinery, food, medicine and agriculture.

[0003] In the production process of oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, it is necessary to quantitatively detect the concentration of oxygen and perfluoroisobutyronitrile therein. Since the concentration of oxygen and perfluoroisobutyronitrile in the oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide is very high, it is difficult to completely separate them on the chromatographic column, and it is impossible to accurately determine the quality and quantity. Therefore, the present application proposes a method and device for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide. Summary of the invention

[0004] The object of the present invention is to provide a method and device for determining oxygen in carbon dioxide and perfluoroisobutyronitrile standard gas, so as to solve the problem that the concentrations of oxygen in carbon dioxide and perfluoroisobutyronitrile in the standard gas are difficult to be accurately quantified.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] A method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, the method comprising the following steps:

[0007] The carrier gas containing the preset volume of sample gas is passed through the chromatographic column I, the chromatographic column II and the chromatographic column III in sequence, wherein the chromatographic column I contains graphitized carbon black coated with 1% polyethylene glycol nitrobenzene stationary liquid, the chromatographic column II contains a 5A molecular sieve, and the chromatographic column III contains a PorapaQ polymer;

[0008] After the carrier gas containing the sample gas completely passes through the chromatographic column III, the perfluoroisobutyronitrile in the chromatographic column I, the oxygen in the chromatographic column II, and the carbon dioxide in the chromatographic column III are purged to the corresponding detectors in turn by the carrier gas to detect the contents of perfluoroisobutyronitrile, oxygen, and carbon dioxide.

[0009] Preferably, the particle size of the graphitized carbon black in the chromatographic column I is 60 mesh to 80 mesh.

[0010] Preferably, the particle size of the 5A molecular sieve in the chromatographic column II is 50-60 mesh.

[0011] Preferably, the particle size of the high molecular weight polymer in the chromatographic column III is 60-80 mesh.

[0012] The present invention also discloses a device for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, which is used to implement the above method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, comprising:

[0013] At least one multi-channel gas switching valve for switching the gas flow direction;

[0014] Chromatographic column I, chromatographic column II and chromatographic column III, wherein the chromatographic column I, the chromatographic column II and the chromatographic column III are connected to a multi-channel gas switching valve via a tube structure;

[0015] The detector is used to detect the content of perfluoroisobutyronitrile, oxygen and carbon dioxide. The detector is connected to the multi-channel gas switching valve and the chromatographic column I, the chromatographic column II and the chromatographic column III through a tube structure.

[0016] Furthermore, the multi-channel gas switching valve comprises:

[0017] A valve housing, wherein at least two air passages arranged in parallel are arranged in the valve housing;

[0018] A valve core is arranged in the valve housing, the valve core is provided with at least one communication groove, and the air passage is provided with a hole structure at the position of the communication groove to communicate with the communication groove;

[0019] A valve tube, wherein the valve tube is in the shape of a cylinder with an opening at one end, the valve tube is slidably connected to the airway, and the outer wall of the valve tube is sealed with the inner wall of the airway, and a valve hole is provided on the valve tube to connect the inner and outer sides of the valve tube, so that the gas entering the airway can only enter the valve tube;

[0020] A telescopic module is connected to the valve tube to control the valve tube to slide in the airway. When the valve hole is located at the hole structure, the inner side of the valve tube is connected to the corresponding connecting groove through the valve hole and the hole structure.

[0021] Furthermore, the valve core includes a core rod and a plurality of partitions, the core rod and the partitions are an integral structure, the plurality of partitions are arranged at intervals, the partitions and the core rod form an annular connecting groove, and a threaded section is provided at one end of the core rod.

[0022] Furthermore, a sealing groove is provided on the partition, and a sealing ring is sleeved on the sealing groove to seal the valve housing and the partition.

[0023] Furthermore, the multi-channel gas switching valve further includes:

[0024] A flow component, used to respectively measure the flow of the gas flowing through the airway, the flow component comprising:

[0025] A joint shell, wherein the joint shell is a three-way pipe, one end of the joint shell is fixed to the mouth of the airway, and one end of the joint shell away from the airway is sealed;

[0026] A rotating shaft, the rotating shaft is rotatably connected to the inner side of the joint housing, and an impeller is fixed to one end of the rotating shaft located on the inner side of the joint housing;

[0027] The sensor is used to detect the rotation speed of the rotating shaft.

[0028] Furthermore, one end of the rotating shaft away from the impeller is located on the outside of the joint shell, and a driving plate is fixed to the one end of the rotating shaft away from the impeller. A plurality of reflective sheets arranged along the circumferential direction are provided on the driving plate. The sensor includes a light emitting end and a light receiving end. The light beam emitted by the light emitting end is reflected by the reflective sheet and then incident on the light receiving end.

[0029] In summary, the present invention has the following beneficial effects compared with the prior art:

[0030] The method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide disclosed in the embodiment of the present invention absorbs oxygen and perfluoroisobutyronitrile in a carbon dioxide mixer through a chromatographic column, and then purges the oxygen and perfluoroisobutyronitrile in the chromatographic column to a detector through a carrier gas, which are detected by the detector, respectively, so as to accurately quantify oxygen and perfluoroisobutyronitrile in carbon dioxide. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 The present invention is a schematic flow chart of a method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide disclosed in an embodiment of the present invention.

[0032] Figure 2 The present invention is a schematic diagram of the connection of the hardware structure in the method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide disclosed in an embodiment of the present invention.

[0033] Figure 3 The present invention is a schematic diagram of the overall structure of a device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide disclosed in an embodiment of the present invention.

[0034] Figure 4 It is a front view of a device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide disclosed in an embodiment of the present invention.

[0035] Figure 5 for Figure 4 Sectional view of AA.

[0036] Figure 6 for Figure 5 A partial enlarged view of point I in the middle.

[0037] Figure 7The present invention is a schematic diagram of the connection between the fourth shell, the valve tube and the telescopic module in the device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide disclosed in an embodiment of the present invention.

[0038] Figure 8 The present invention is a schematic diagram of the connection between the fourth shell and the valve pipe in the device for measuring oxygen in carbon dioxide and perfluoroisobutyronitrile standard gas disclosed in an embodiment of the present invention.

[0039] Fig. 9 The present invention is a schematic diagram of the structure of a valve core in a device for measuring oxygen in carbon dioxide and perfluoroisobutyronitrile standard gas disclosed in an embodiment of the present invention.

[0040] Fig.10 This is a schematic structural diagram of a joint in a device for measuring oxygen in carbon dioxide and perfluoroisobutyronitrile standard gas disclosed in an embodiment of the present invention from a first perspective.

[0041] Fig.11 This is a structural schematic diagram of a second viewing angle of a joint in a device for measuring oxygen in carbon dioxide and perfluoroisobutyronitrile standard gas disclosed in an embodiment of the present invention.

[0042] Reference numerals:

[0043] 100, valve housing; 101, air duct; 110, first housing; 120, second housing; 130, third housing; 140, fourth housing; 141, air hole; 150, fifth housing; 200, valve core; 210, connecting groove; 220, core rod; 230, partition; 231, sealing groove; 300, valve tube; 310, valve hole; 400, telescopic module; 500, joint; 510, joint housing; 520, first end cap; 530, impeller; 540, rotating shaft; 550, driving plate; 551, reflector; 560, sensor; 570, second end cap. DETAILED DESCRIPTION

[0044] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0045] like Figure 1 As shown, one embodiment of the present invention provides a method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, the method comprising the following steps:

[0046] Step S100, passing a carrier gas containing a preset volume of sample gas through a chromatographic column I, a chromatographic column II, and a chromatographic column III in sequence, wherein the chromatographic column I contains graphitized carbon black coated with 1% SP-1000 (polyethylene glycol nitrobenzene) stationary liquid, the chromatographic column II contains a 5A molecular sieve, and the chromatographic column III contains a high molecular polymer;

[0047] Step S200, after the carrier gas containing the sample gas completely passes through the chromatographic column III, the perfluoroisobutyronitrile in the chromatographic column I, the oxygen in the chromatographic column II, and the carbon dioxide in the chromatographic column III are purged to the corresponding detectors in turn by the carrier gas to detect the contents of perfluoroisobutyronitrile, oxygen, and carbon dioxide.

[0048] Specifically, in this embodiment, if Figure 2 As shown, the carrier gas source is connected to the first and seventh interfaces of the multi-channel gas switching valve V1, and the sample gas source is connected to the third interface of the multi-channel gas switching valve V1, wherein the second interface and the fifth interface of the multi-channel gas switching valve V1 are communicated, and a quantitative loop (for capturing a preset gas) is arranged between the second interface and the fifth interface of the multi-channel gas switching valve V1, the tenth interface of the multi-channel gas switching valve V1 is connected to one end of the chromatographic column III, and the other end of the chromatographic column III is connected to the fourth interface of the multi-channel gas switching valve V2, the ninth interface and the sixth interface of the multi-channel gas switching valve V1 are respectively connected to the two ends of the chromatographic column I, the eighth interface of the multi-channel gas switching valve V1 is connected to the three-way switching valve, and the remaining two interfaces of the three-way switching valve are respectively connected to the detector and the first interface of the multi-channel gas switching valve V2, the second interface and the third interface of the multi-channel gas switching valve V2 are communicated, and the fifth interface and the sixth interface of the multi-channel gas switching valve V2 are respectively connected to the two ends of the chromatographic column II;

[0049] When performing quantitative analysis of oxygen and perfluoroisobutyronitrile, the flow directions of the carrier gas and the sample gas are changed by the multi-channel gas switching valve V1 and the multi-channel gas switching valve V2. In the initial state, the multi-channel gas switching valve V1 and the multi-channel gas switching valve V2 are Figure 2The connection mode shown, at this time, the second interface and the third interface, the fourth interface and the fifth interface, the sixth interface and the seventh interface, the eighth interface and the ninth interface, the tenth interface and the first interface in the multi-channel gas switching valve V1 are connected (recorded as the first state), the sample gas is introduced into the third interface of the multi-channel gas switching valve V1, the sample gas enters the fifth interface of the multi-channel gas switching valve V1 after passing through the quantitative loop, and is discharged from the fourth interface of the multi-channel gas switching valve V1, the quantitative loop intercepts a preset volume of sample gas, and a preset volume of sample gas is stored in the quantitative loop. At this time, the multi-channel gas switching valve V1 is switched so that the first interface and the second interface, the third interface and the fourth interface, the fifth interface and the sixth interface, the seventh interface and the eighth interface, the ninth interface and the tenth interface are connected (recorded as the second state), the carrier gas enters the multi-channel gas switching valve V1 through the first interface of the multi-channel gas switching valve V1, and enters the quantitative loop through the second interface, the carrier gas carries the sample gas through the fifth interface and the sixth interface to enter the chromatographic column I, and enters the chromatographic column III through the ninth interface and the tenth interface, and enters the chromatographic column II along the fourth interface and the fifth interface of the multi-channel gas switching valve V2;

[0050] When purging perfluoroisobutyronitrile, the multichannel gas switching valve V1 is switched to the first state, the carrier gas enters the chromatographic column I along the seventh interface and the sixth interface of the multichannel gas switching valve V1, and the perfluoroisobutyronitrile in the chromatographic column I is purged to the detector along the ninth interface, the eighth interface and the three-way valve;

[0051] When purging carbon dioxide, the multi-channel gas switching valve V1 is in the first state, and the multi-channel gas switching valve V2 is switched to the second state. At this time, the first interface and the second interface, the third interface and the fourth interface, and the fifth interface and the sixth interface in the multi-channel gas switching valve V2 are connected, and the carrier gas enters from the first interface of the multi-channel gas switching valve V1 and enters the chromatographic column III along the tenth interface. After carrying carbon dioxide in the chromatographic column III, it enters the three-way valve along the fourth interface, the third interface, the second interface, and the first interface of the multi-channel gas switching valve V2, and then enters the detector;

[0052] When purging oxygen, the multi-channel gas switching valve V1 and the multi-channel gas switching valve V2 are Figure 2 The connection state shown, at this time, the carbon dioxide in the chromatographic column III is purged, the carrier gas enters from the first interface of the multi-channel gas switching valve V1 and enters the chromatographic column III along the tenth interface, and enters the chromatographic column II from the fourth interface and the fifth interface of the multi-channel gas switching valve V2, and then enters the three-way valve from the sixth interface and the first interface of the multi-channel gas switching valve V2 and then enters the detector.

[0053] The method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide disclosed in the embodiment of the present invention absorbs oxygen and perfluoroisobutyronitrile in a carbon dioxide mixer through a chromatographic column, and then purges the oxygen and perfluoroisobutyronitrile in the chromatographic column to a detector through a carrier gas, which are detected by the detector, respectively, so as to accurately quantify oxygen and perfluoroisobutyronitrile in carbon dioxide.

[0054] As a preferred implementation in this embodiment, the chromatographic column I is a stainless steel column, and the chromatographic column I is filled with graphitized carbon black with a particle size of 60-80 mesh and coated with 1% SP-1000 stationary liquid;

[0055] In this embodiment, the dimensions of the chromatographic column I are 4 meters in length and 2 meters in inner diameter.

[0056] As a preferred implementation in this embodiment, the chromatographic column II is a stainless steel column, and the chromatographic column II is filled with 5A molecular sieve with a particle size of 50-60 mesh;

[0057] In this embodiment, the size of the chromatographic column II is 3 meters in length and 2 meters in inner diameter.

[0058] As a preferred implementation in this embodiment, the chromatographic column III is a stainless steel column, and the chromatographic column II is filled with a high molecular polymer (PorapaQ, a porous polymer copolymerized by ethylvinylbenzene and divinylbenzene) with a particle size of 60-80 meshes;

[0059] In this embodiment, the size of the chromatographic column II is 3 meters in length and 2 meters in inner diameter.

[0060] It should be noted that, in this embodiment, the chromatographic column I, chromatographic column II and chromatographic column III may also be other equivalent chromatographic columns.

[0061] In this embodiment, the detector is a helium ionization detector.

[0062] Example 2

[0063] like Figure 2As shown, this embodiment also discloses a device for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, the device comprising a multi-channel gas switching valve, a chromatographic column I, a chromatographic column II, a chromatographic column III and a detector, the carrier gas and the sample gas are connected to the multi-channel gas switching valve, the chromatographic column I, the chromatographic column II, the chromatographic column III and the detector are connected to the gas switching valve through a pipeline, the gas switching valve switches the flow direction of the carrier gas and the sample gas, so that the carrier gas and the sample gas are mixed and flow through the chromatographic column I, the chromatographic column II, and the chromatographic column III in sequence, and at the same time, after switching the gas path, the carrier gas flows to the chromatographic column I and the detector, the chromatographic column II and the detector, and the chromatographic column III and the detector, respectively, so that the carrier gas can blow the components in the chromatographic column I, the chromatographic column II and the chromatographic column III into the detector;

[0064] As one of the implementation modes in this embodiment, the multi-channel gas switching valve is provided with two, namely the multi-channel gas switching valve V1 and the multi-channel gas switching valve V2 described in Example 1. The connection method between the multi-channel gas switching valve and the chromatographic column I, the chromatographic column II, the chromatographic column III and the detector is as shown in Example 1. The carrier gas source is connected to the first and seventh interfaces of the multi-channel gas switching valve V1, and the sample gas source is connected to the third interface of the multi-channel gas switching valve V1. The second interface of the multi-channel gas switching valve V1 is connected to the fifth interface, and a There is a quantitative loop, the tenth interface of the multi-channel gas switching valve V1 is connected to one end of the chromatographic column III, the other end of the chromatographic column III is connected to the fourth interface of the multi-channel gas switching valve V2, the ninth interface and the sixth interface of the multi-channel gas switching valve V1 are respectively connected to the two ends of the chromatographic column I, the eighth interface of the multi-channel gas switching valve V1 is connected to the three-way switching valve, the remaining two interfaces of the three-way switching valve are respectively connected to the detector and the first interface of the multi-channel gas switching valve V2, the second interface and the third interface of the multi-channel gas switching valve V2 are connected, and the fifth interface and the sixth interface of the multi-channel gas switching valve V2 are respectively connected to the two ends of the chromatographic column II;

[0065] In this embodiment, the quantitative loop is a 0.2 mL quantitative loop;

[0066] As a preferred implementation in this embodiment, Figures 3 to 5 As shown, the multi-channel gas switching valve comprises:

[0067] A valve housing 100, wherein at least two air passages 101 arranged in parallel are arranged in the valve housing 100;

[0068] A valve core 200 is disposed in the valve housing 100 , wherein the valve core 200 is provided with at least one communication groove 210 , and the air passage 101 is provided with a hole structure at the position of the communication groove 210 to communicate with the communication groove 210 ;

[0069] The valve tube 300 is a cylindrical tube with an opening at one end. The valve tube 300 is slidably connected to the airway 101, and the outer wall of the valve tube 300 is sealed with the inner wall of the airway 101. The valve tube 300 is provided with a valve hole 310 to connect the inner and outer sides of the valve tube 300. The gas entering the airway 101 can only enter the valve tube 300;

[0070] The telescopic module 400 is connected to the valve tube 300 to control the valve tube 300 to slide in the airway 101. When the valve hole 310 is located at the hole structure, the inner side of the valve tube 300 is connected to the corresponding connecting groove 210 through the valve hole 310 and the hole structure.

[0071] In this embodiment, if Figures 3 to 5 As shown, ten air channels 101 are provided, and the ten air channels 101 are distributed on the outer side of the valve core 200 in the circumferential direction. Five connecting grooves 210 are provided on the valve core 200, and the five connecting grooves 210 are distributed along the axis of the valve core 200. The air channel 101 is coaxially arranged with the valve core 200. The air channel 101 is a through hole structure provided on the valve housing 100. The output end of the telescopic module 400 is fixedly connected to the closed end of the valve tube 300. The telescopic module 400 can drive the valve tube 300 to slide in the air channel 101. Five hole structures are provided on each of the air channels 101 to connect the corresponding connecting grooves 210. When the valve tube 300 slides to a preset position, the valve holes 310 can be respectively communicated with the corresponding connecting grooves 210. The air channel 101 is close to the opening of the valve tube 300. One end of the connecting tube structure is used to connect chromatographic column I, chromatographic column II, chromatographic column III and gas source, etc. The gas enters and exits from one end of the airway 101 close to the opening of the valve tube 300. When the controlled interface is connected, the valve hole 310 in the airway 101 that needs to be connected stays in the same position. For example, the airways 101 are numbered 1-10, and the connecting grooves 210 are numbered AE. When the No. 1 interface and the No. 2 interface need to be connected, the No. 1 interface and the No. 2 corresponding valve tube 300 slide in the corresponding airway 101, so that the valve holes 310 on the valve tube 300 corresponding to the No. 1 interface and the No. 2 interface stay at the connecting groove 210 numbered A at the same time, then the No. 1 interface and the No. 2 interface are connected through the connecting groove 210 numbered A. Similarly, if other interfaces need to be connected, the valve tubes 300 corresponding to the interfaces can stay in the same position.

[0072] Specifically, in this embodiment, if Fig. 9 As shown, the valve core 200 includes a core rod 220 and a plurality of partitions 230, the core rod 220 and the partitions 230 are an integral structure, a plurality of the partitions 230 are arranged at intervals, the partitions 230 and the core rod 220 form an annular connecting groove 210, one end of the core rod 220 is provided with a threaded section for connecting to the valve housing 100, and the other end of the core rod 220 is provided with a blind hole structure for connecting a wrench;

[0073] Preferably, a sealing groove 231 is provided on the partition plate 230 , and a sealing ring is sleeved on the sealing groove 231 to seal the valve housing 100 and the partition plate 230 , thereby isolating adjacent communicating grooves 210 .

[0074] As a preferred implementation in this embodiment, Figure 5 , Figure 7 as well as Figure 8As shown, the valve housing 100 includes a first shell 110, a second shell 120, a plurality of fourth shells 140 and a fifth shell 150, the first shell 110 is a cylindrical structure, the second shell 120 is a cylindrical structure, the first shell 110 is provided with a through hole structure along the axial direction to form an air passage 101, the upper side wall of the second shell 120 is provided with a through hole structure along the axial direction to form an air passage 101, the fourth shell 140 is a fan-shaped structure, the fourth shell 140 is provided with a through hole structure to form an air passage 101, the through hole structures on the first shell 110, the second shell 120 and the fourth shell 140 form a completed air passage 101, the first shell 110 and the second shell 120 are provided with a groove structure at the ends close to the fourth shell 140 to install the fourth shell 140, the plurality of fourth shells 140 form a cylindrical structure with openings at both ends, the fourth shell 140 surrounds the valve core 2 in the circumferential direction 00 is evenly distributed along the axis, the adjacent fourth shells 140 are abutted, the fourth shells 140 are located at the fourth shells 140, one end of the valve core 200 is fixed to the first shell 110 through a threaded structure, the first shell 110, the valve core 200 and the second shell 120 are coaxially arranged, the third shell 130 is a semicircular groove structure, the two third shells 130 are mirror-arranged, the two third shells 130 are connected by bolts, the two third shells 130 are covered on the outside of the fourth shell 140 to fix the fourth shell 140, the ends of the first shell 110 and the second shell 120 are also provided with a slot structure, the inner side of the third shell 130 is provided with an annular clip strip, when the two third shells 130 are connected, the clip strip is located in the slot, so that the third shell 130 can fix the first shell 110 and the second shell 120, thereby preventing the first shell 110 and the second shell 120 from moving;

[0075] When installing the first shell 110, the second shell 120, the third shell 130 and the fourth shell 140, the fourth shell 140 is first fixed to the first shell 110 / the second shell 120 by gluing, then the second shell 120 / the first shell 110 is installed, and finally the third shell 130 is installed, so that the third shell 130 fixes the first shell 110, the second shell 120 and the fourth shell 140. Since the fourth shell 140 is a fan-shaped block, when the third shell 130 is fixed, the third shell 130 squeezes the fourth shell 140, thereby improving the sealing between adjacent fourth shells 140;

[0076] The fourth housing 140 is provided with air holes 141 to form a hole structure of the valve housing 100;

[0077] Preferably, a sealing strip is further provided between adjacent fourth shells 140 , for use in adjacent fourth shells 140 .

[0078] As a preferred implementation in this embodiment, the telescopic module 400 is an electric telescopic rod, and the output end of the telescopic module 400 is fixedly connected to the end of the valve tube 300 by gluing;

[0079] Preferably, the valve housing 100 further includes a fifth housing 150, the fifth housing 150 is cylindrical with an opening at one end, the opening of the fifth housing 150 is fixed to the end of the second housing 120 away from the first housing 110 by gluing or screwing, the end of the fifth housing 150 away from the first housing 110 is provided with a plurality of fixing holes for fixing the telescopic module 400, the telescopic module 400 is fixedly connected to the fixing holes by gluing, and the fixing holes pass through the closed end of the fifth housing 150;

[0080] It should be noted that the telescopic module 400 may also be a pneumatic or hydraulic telescopic rod.

[0081] As a preferred implementation in this embodiment, the multi-channel gas switching valve further includes:

[0082] A connector 500, used to measure the flow rate of the gas flowing through the gas channel 101;

[0083] Specifically, Figure 5 , Figure 6 and Fig.10 , Fig.11 As shown, the connector 500 comprises:

[0084] A joint housing 510, wherein the joint housing 510 is a three-way pipe, one end of the joint housing 510 is fixed to the mouth of the airway 101, the end of the joint housing 510 away from the airway 101 is sealed, and the opening in the middle of the joint housing 510 is used to connect the air pipe;

[0085] A rotating shaft 540, wherein the rotating shaft 540 is rotatably connected to the inner side of the joint housing 510, and an impeller 530 is fixed to one end of the rotating shaft 540 located inside the joint housing 510;

[0086] A sensor 560, used to detect the rotation speed of the rotating shaft 540;

[0087] In this embodiment, the joint housing 510 is fixed to the mouth of the air passage 101 through a threaded structure, the joint housing 510 is closed by a first end cap 520, the first end cap 520 is fixed to one end of the joint housing 510 through an adhesive or threaded structure, the rotating shaft 540 is rotatably connected to the first end cap 520, the impeller 530 is fixed to the end of the rotating shaft 540 through an interference fit, the end of the rotating shaft 540 away from the impeller 530 is rotatably connected to the first end cap 520, the impeller 530 is close to one side of the air passage 101, so that the gas flows through the impeller 530 and enters the air passage 101;

[0088] Preferably, one end of the rotating shaft 540 away from the impeller 530 is located outside the joint housing 510, and a driving plate 550 is fixed to the one end of the rotating shaft 540 away from the impeller 530. A plurality of reflective sheets 551 arranged along the circumferential direction are arranged on the driving plate 550. The sensor 560 includes a light emitting end and a light receiving end. The light beam emitted by the light emitting end is reflected by the reflective sheet 551 and then incident on the light receiving end. The light emitting end includes a light source and a focusing portion for generating parallel light beams. The light receiving end is a light intensity transmission resistor. After receiving the light from the light emitting end, When the driving plate 550 rotates, the light beam of the light emitting end intermittently irradiates the reflective sheet 551 and is reflected by the reflective sheet 551 to the light receiving end. The rotation speed of the driving plate 550 can be identified by identifying the current change cycle of the light receiving end. If six reflective sheets 551 are provided, the distance between adjacent reflective sheets 551 is 60 degrees. For each rotation of the driving plate 550, the light receiving end generates six current changes. If six current changes are detected at the light receiving end per second, the rotation speed of the driving plate 550 is 1 revolution / second.

[0089] Preferably, in this embodiment, the driving board 550 is connected to a second end cap 570 , the sensor 560 is fixed to the second end cap 570 , and the light receiving end is also connected to a current detection circuit for detecting current changes at the light receiving end.

[0090] The terms used in the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "the" and "the" used in the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0091] It should be understood that although the terms first, second, third, etc. may be used in the present invention to describe various information, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present invention, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining".

[0092] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, characterized in that: include: At least one multi-channel gas switching valve for switching the gas flow direction; A chromatographic column I, a chromatographic column II and a chromatographic column III, wherein the chromatographic column I, the chromatographic column II and the chromatographic column III are connected to a multi-channel gas switching valve through a tube structure, wherein the chromatographic column I contains graphitized carbon black coated with 1% polyethylene glycol nitrobenzene stationary liquid, the chromatographic column II is built with a 5A molecular sieve, and the chromatographic column III is built with a PorapaQ high molecular polymer; A detector, used to detect the contents of perfluoroisobutyronitrile, oxygen and carbon dioxide, wherein the detector is connected to the multi-channel gas switching valve and the chromatographic columns I, II and III through a tube structure; Wherein, the multi-channel gas switching valve comprises: A valve housing, wherein at least two air passages arranged in parallel are arranged in the valve housing; A valve core is arranged in the valve housing, the valve core is provided with at least one communication groove, the air passage is provided with a hole structure at the position of the communication groove to communicate with the communication groove, the valve core comprises a core rod and a plurality of partitions, the core rod and the partitions are an integral structure, a plurality of the partitions are arranged at intervals, the partitions and the core rod form an annular communication groove, and a threaded section is provided at one end of the core rod; A valve tube, which is cylindrical with an opening at one end. The valve tube is slidably connected in the airway and its sliding is controlled by a telescopic module. The outer wall of the valve tube is sealed with the inner wall of the airway. A valve hole is provided on the side wall of the valve tube to connect the inside and outside of the valve tube. The gas entering the airway can only enter the valve tube. During the sliding of the valve tube, the interior of the valve tube is connected to the corresponding connecting groove through the valve hole and the hole structure.

2. The device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide according to claim 1, characterized in that: The partition is provided with a sealing groove, and a sealing ring is sleeved on the sealing groove to seal the valve housing and the partition.

3. The device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide according to claim 1, characterized in that: The multi-channel gas switching valve also includes: A flow component, used to respectively measure the flow of the gas flowing through the airway, the flow component comprising: A joint shell, wherein the joint shell is a three-way pipe, one end of the joint shell is fixed to the mouth of the airway, and one end of the joint shell away from the airway is sealed; A rotating shaft, the rotating shaft is rotatably connected to the inner side of the joint housing, and an impeller is fixed to one end of the rotating shaft located on the inner side of the joint housing; The sensor is used to detect the rotation speed of the rotating shaft.

4. The device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide according to claim 3, characterized in that: One end of the rotating shaft away from the impeller is located on the outside of the joint shell, and a driving plate is fixed to the end of the rotating shaft away from the impeller. A plurality of reflective sheets arranged along the circumferential direction are provided on the driving plate. The sensor includes a light emitting end and a light receiving end. The light beam emitted by the light emitting end is reflected by the reflective sheet and then incident on the light receiving end.

5. A method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide, characterized in that: The method is implemented based on the device for measuring oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide according to any one of claims 1 to 4, and comprises the following steps: Passing a carrier gas containing a preset volume of sample gas through chromatographic column I, chromatographic column II, and chromatographic column III in sequence; After the carrier gas containing the sample gas completely passes through the chromatographic column III, the perfluoroisobutyronitrile in the chromatographic column I, the oxygen in the chromatographic column II, and the carbon dioxide in the chromatographic column III are purged to the corresponding detectors in sequence by the carrier gas to detect the contents of perfluoroisobutyronitrile, oxygen, and carbon dioxide; The mixing of the carrier gas and the sample gas and the flow direction of the carrier gas are controlled by a multi-channel gas switching valve.

6. The method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide according to claim 5, characterized in that: The particle size of the graphitized carbon black in the chromatographic column I is 60 mesh to 80 mesh.

7. The method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide according to claim 5, characterized in that: The particle size of the 5A molecular sieve in the chromatographic column II is 50-60 mesh.

8. The method for determining oxygen and perfluoroisobutyronitrile standard gas in carbon dioxide according to claim 5, characterized in that: The particle size of the high molecular weight polymer in the chromatographic column III is 60-80 mesh.

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