A flow path system with a multi-channel selection valve and a method of using the same

Abstract

The present invention provides a flow path system with a multi-channel selection valve and a use method thereof. The multi-channel selection valve comprises a valve head, a valve body, a movable valve core and a fixed valve wrapped in the valve head and the valve body and closely connected to each other, and a valve core rotating shaft rotatably connected to the valve body. The movable valve core is fixedly installed on the valve core rotating shaft, and the fixed valve core is provided with at least three L-shaped grooves and multiple through grooves and a COM channel in the middle. The movable valve core is provided with an arc groove only connected to the L-shaped groove and a long groove that can be connected to the L-shaped groove, the COM channel and the through groove, thereby forming two flow paths. The valve head is provided with an injection channel connected to the COM channel for injection and an exchange channel, and the exchange channel is used to connect an injection mechanism, a nitrogen blowing mechanism, a collecting mechanism, and a cleaning tank to form a flow path system with a multi-channel selection valve, and a use method of the system. The existing three-way valve is matched with a multi-channel selection valve. The flow path system of the present invention is not easily damaged by the three-way valve due to residual sediment.

Description

Technical Field

[0001] The present invention relates to the technical field of solid extraction equipment, and in particular to a flow path system with a multi-channel selection valve and a use method thereof. Background Art

[0002] At present, in addition to the QuEChERS method commonly used in the detection of pesticide residues in plant-derived foods, other major detection items, such as veterinary drug residues in animal-derived foods, pesticide residues in animal-derived foods, pesticide residue detection in traditional Chinese medicine, organic matter detection in water quality including POPs and antibiotic detection, and SVOCS, toxin detection in plant-derived foods, milk, etc., tend to use solid phase extraction for concentration or purification. The principle of solid phase extraction is that when a complex sample solution passes through an adsorbent, the adsorbent will selectively retain the target and a small amount of components with similar properties to the target through polar interactions, hydrophobic interactions or ion exchange, and other components will flow out of the small column through the adsorbent, and then another solvent system will selectively elute the target, thereby achieving separation, purification and enrichment of complex samples. As a solid phase extraction instrument, a multi-channel solid phase extractor often uses a multi-channel selection valve and multiple liquid three-way valves in combination. The middle of the multi-channel selection valve serves as a common end, which is connected to the surrounding holes through a flow path to play a selection role. The fluid three-way valve adds gas path selection to the outside of one of the surrounding channels to switch different pipeline channels. Existing, such as Chinese patent CN206557171U, an automatic pre-treatment device for trace phenol in water, including a syringe pump, a six-position selection valve, a buffer coil, a three-way valve, a liquid distribution pipeline, and a solution vessel. The syringe pump is connected to the three-way valve, and the three-way valve is connected to a nitrogen input pipe and a sample bottle. The three-way valve is connected to the six-position selection valve through a buffer coil. The six-position selection valve is provided with six rotation positions A, B, C, D, E, and F. The rotation position is connected to the corresponding solution vessel or liquid chromatograph through a liquid distribution pipeline. The solution vessel includes a waste liquid bottle 1, a H2O reagent bottle, a methanol reagent bottle, a concentrator, and a waste liquid bottle 2. The solid phase extraction technology is adopted, and the system design combined with the syringe pump, the buffer coil and the multi-position valve realizes the automation of complex operations, ensures the consistency of operation during the solid phase extraction process, and improves the precision of the analysis. Provides a simple and fast pre-treatment system for the analysis of trace phenol in water. However, there may be fine sand particles in water samples from rivers. These fine sand particles enter the three-way valve after passing through the channel selection valve. When one channel of the three-way valve is closed, the sand particles are easily stuck in the three-way valve, causing damage to the three-way valve. Summary of the invention

[0003] The present invention provides a flow path system with a multi-channel selection valve and a use method thereof, aiming to solve the problem that a three-way valve used in conjunction with the multi-channel selection valve is easily damaged due to residual mud and sand by providing a new multi-channel selection valve and a flow path system with the multi-channel selection valve.

[0004] The present invention provides a flow path system with a multi-channel selection valve and a method of using the same, which adopts the following technical solutions:

[0005] A multi-channel selection valve, comprising from top to bottom: a valve head, a valve body, a valve core rotating shaft, and a fixed valve core and a movable valve core arranged between the valve head and the valve core rotating shaft and in contact with each other, the valve head is provided with an injection channel running through the upper and lower parts and exchange channels located on both sides of the injection channel, and the lower end of the valve head is provided with a first mounting groove for embedding the set valve core;

[0006] The middle part of the valve body is provided with a rotation groove running through the upper and lower parts, the valve core rotation shaft is rotatably connected in the rotation groove, and the upper end of the valve core rotation shaft is provided with a second installation groove for embedding the moving valve core;

[0007] The center of the fixed valve core is provided with a COM channel which passes through the upper and lower parts and is connected to the injection channel. The fixed valve core is also provided with a plurality of through grooves which pass through and are connected to the exchange channel and at least two adjacent L-shaped grooves arranged in an arc shape. Each of the through grooves and each of the L-shaped grooves are located on a circle centered on the COM channel.

[0008] Adjacent long grooves and circular arc grooves are provided on the upper surface of the moving valve core. One end of the long groove is connected to the center of the moving valve core and the COM channel, and the other end is connected to the through groove or the L-shaped groove. The center of the circular arc groove coincides with the center of the moving valve core, and the circular arc groove and the L-shaped groove are connected. The farthest distance from the circular arc groove to the center of the moving valve core is less than or equal to the shortest distance from the through groove to the center of the fixed valve core.

[0009] Preferably, the vertical section of the rotating groove is T-shaped, the vertical section of the valve core rotating shaft is Y-shaped, a disc-shaped spring piece is installed on the lower side of the valve core rotating shaft, and the bottom surfaces on both sides of the valve core rotating shaft and the bottom surfaces on both sides of the rotating groove are in contact with the disc-shaped spring piece.

[0010] Preferably, a first annular bearing groove is provided on the bottom surface of the rotating groove, a first bearing is installed on the lower side wall of the valve core rotating shaft, and the first bearing is rotatably connected in the first bearing groove.

[0011] Preferably, a second annular bearing groove is further provided at the lower portion of the first bearing groove, a second bearing is installed on the lower side wall of the valve core shaft, the second bearing is rotatably connected in the second bearing groove, and the groove width of the second bearing groove is smaller than the groove width of the first bearing groove.

[0012] Preferably, a protruding positioning pin is provided on the upper surface of the valve body, a positioning groove is provided on the lower surface of the valve head, and the positioning pin is inserted into the positioning groove.

[0013] A flow path system having the above-mentioned multi-channel selection valve, further comprising: a syringe connected to the injection channel, and an injection mechanism, a nitrogen blowing mechanism, a collecting mechanism and a cleaning tank connected to the exchange channel, wherein the injection mechanism is connected to an L-shaped groove adjacent to both the through groove and the L-shaped groove, and the cleaning tank is connected to the through groove adjacent to the L-shaped groove, the nitrogen blowing mechanism is connected to the L-shaped groove adjacent to both the two L-shaped grooves, and the collecting mechanism is connected to another L-shaped groove adjacent to both the through groove and the L-shaped groove;

[0014] The injection mechanism includes an upper sample bottle and an injection needle arranged between the valve head and the upper sample bottle, the nitrogen blowing mechanism is used to unidirectionally introduce nitrogen into the L-shaped groove, and the collection mechanism includes a collection bottle and an SPE column arranged between the multi-channel selection valve and the collection bottle.

[0015] Preferably, the nitrogen blowing mechanism comprises a nitrogen input end and a gas diverter, a directional control valve, a solenoid valve and a pressure control valve which are sequentially connected in series from the multi-channel selection valve to the nitrogen input end.

[0016] A method for using the flow path system with the multi-channel selection valve is as follows: a solvent is loaded into any through slot except the through slot connected to the cleaning slot, and then the following steps are performed:

[0017] S1, rotating the valve core shaft until the long groove is connected to the through groove adjacent to the L-shaped groove connected to the collecting mechanism, the L-shaped groove connected to the collecting mechanism and the L-shaped groove connected to the nitrogen blowing mechanism are both connected to the arc groove, and the nitrogen blowing mechanism introduces nitrogen into the collecting mechanism;

[0018] S2, rotating the valve core shaft until the long groove is connected to the L-shaped groove connected to the collecting mechanism, the L-shaped groove connected to the nitrogen blowing mechanism and the L-shaped groove connected to the injection mechanism are both connected to the arc groove, and the nitrogen blowing mechanism introduces nitrogen into the injection mechanism;

[0019] S3, rotating the valve core shaft until the long groove is connected with any through groove containing solvent, the syringe extracts the solvent, and S2 is repeated, and the syringe discharges the extracted solvent into the collection mechanism;

[0020] S4, rotating the valve core shaft until the long groove is connected to the L-shaped groove connected to the injection mechanism, the syringe draws the sample in the upper sample bottle, repeating S2, the syringe discharges the drawn sample into the collection mechanism;

[0021] S5. Rotate the valve core shaft until the long groove is connected to the through groove connected to the cleaning groove.

[0022] Compared with the prior art, the beneficial technical effects of the present invention are:

[0023] 1. The present invention provides a flow path system with a multi-channel selector valve and a method for using the same. By arranging three L-shaped grooves and multiple through grooves and a COM channel connected to a liquid injection channel on a fixed valve core, and arranging a long groove for connecting an L-shaped groove or a through groove and a liquid injection channel on a movable valve core, a flow path is formed for passing liquid into and discharging liquid from the inside of the multi-channel selector valve. The movable valve core is driven to rotate by a valve core rotating shaft to change the interface of the flow path, i.e., different L-shaped grooves or through grooves. There is no need to match the three-way valve in the prior art, thus avoiding the existing multi-channel selector valve having the same The problem that the flow path system of the three-way valve is damaged due to the residual mud and sand particles in the three-way valve when processing water samples is solved; an arc groove for connecting the two L-shaped grooves is arranged on the moving valve core to form another flow path, and in the flow path system with a multi-channel selection valve, the arc groove is connected with the L-shaped groove, and the moving valve core is rotated by the valve core rotating shaft to change the interface position of the flow path, that is, different L-shaped grooves, thereby reducing the number of flow path interfaces of different functional mechanisms of the existing flow path system with a multi-channel selection valve, reducing the number of samples remaining in multiple places in the flow path system, and facilitating the operation of the flow path system, saving costs.

[0024] 2. The present invention provides a flow path system with a multi-channel selection valve and a method of using the same. A disc-shaped spring is installed at the position from the valve core shaft to the bottom of the rotating groove, that is, on the side of the valve core shaft away from the moving valve core. The valve core shaft is inserted into the disc-shaped spring from the hollow part in the middle of the disc-shaped spring. It can store a certain amount of kinetic potential energy by leveraging force. In the process of slow relaxation, some of the kinetic potential energy will be converted into power to connect the moving valve core and the fixed valve core, thereby achieving the effect of sealing the spring, so that the moving valve core can rotate against the lower surface of the fixed valve core, so that the two are tightly connected without leakage.

[0025] 3. The present invention provides a flow path system with a multi-channel selection valve and a method of using the same, which is used to realize the rotation of the valve core shaft in the valve body by installing a first bearing on the circumferential side wall at the lower side of the valve core shaft.

[0026] 4. The present invention provides a flow path system with a multi-channel selection valve and a method of using the same. A second bearing is installed on the circumferential side wall at the lower side of the valve core shaft. The second bearing and the first bearing form a bearing group, respectively bearing radial force and axial force, so that the valve core shaft is not easy to tilt when rotating, thereby ensuring a tight connection and no air leakage between the fixed valve core and the moving valve core. The first bearing groove, the second bearing groove, and the positioning groove cooperate to form a total groove for installing the valve core shaft and the first bearing, the second bearing, and the disc-shaped spring piece, so that the valve core shaft is not easy to deviate when rotating.

[0027] 5. The present invention provides a flow path system with a multi-channel selection valve and a method of using the same. When the valve head and the valve body are installed, the positioning pin installed on the valve body can be inserted into the positioning groove of the valve head. Since the position of the center of the fixed valve core and the moving valve core to the location of the positioning pin can be determined, when the valve head and the valve body are tightly fitted, the center of the fixed valve core and the moving valve core can be directly aligned, which is easy to operate.

[0028] 6. The present invention provides a flow path system with a multi-channel selection valve and a method of using the same. The nitrogen blowing mechanism is used to introduce nitrogen into the multi-channel selection valve in a unidirectional manner. The collecting bottle and the injection mechanism can connect the two flow paths of the multi-channel selection valve. The sample or solvent can enter the collecting bottle to realize the solid phase extraction function of the SPE column. The valve core shaft is rotated to control the rotation and displacement of the valve core to realize the switching of the flow path composition characteristics, so as to realize the switching of different functions of the flow path system. The system has a high degree of integration.

[0029] 7. The present invention provides a flow path system with a multi-channel selection valve and a method of using the same, wherein the pressure control valve is used to adjust the pressure of the input nitrogen, the solenoid valve is used to control the on-off of the nitrogen, and the gas diverter and the direction control valve are used to control the flow direction of the nitrogen, thereby forming a nitrogen blowing mechanism that can only allow the multi-channel selection valve to introduce nitrogen in one direction.

[0030] 8. The present invention provides a flow path system with a multi-channel selection valve and a method of using the same. When in step S1, the flow path where the arc groove is located is blown dry by introducing nitrogen gas to dry the SPE column. When in step S2, the flow path where the arc groove is located is blown dry by introducing nitrogen gas to dry the injection needle. When in step S3, the flow path where the long groove is located is drawn by a syringe to extract the solvent and transport it to a collecting bottle to contact the SPE column. When in step S4, the flow path where the long groove is located is drawn by a syringe to extract the sample in the upper sample bottle and transport it to the collecting bottle to contact the SPE column. When in step S5, the COM channel of the fixed valve core is connected to the through groove connected to the cleaning tank, the flow path where the arc groove is located is blocked, the syringe pushes out the solvent to discharge waste, and the injection needle can be first inserted into the cleaning tank, and then the solvent in the syringe is pushed out to clean the injection needle, thereby enriching the function of the flow path system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 is a cross-sectional schematic diagram of the multifunctional selection valve of the present invention;

[0032] Figure 2 It is a schematic cross-sectional structure diagram of a valve head and a valve core rotating shaft of a multifunctional selector valve of the present invention;

[0033] Figure 3 1. It is a schematic diagram of a fixed valve core of a multifunctional selector valve of the present invention from multiple perspectives;

[0034] Figure 4 Schematic diagram of a moving valve core of a multifunctional selector valve of the present invention from multiple perspectives;

[0035] Figure 5 It is a schematic diagram of a flow path system of a multi-channel selection valve of the multi-function selection valve of the present invention;

[0036] Figure 6 Schematic diagram of the connection state 1 of the fixed valve core and the movable valve core of the present invention;

[0037] Figure 7 Schematic diagram of the second connection state of the fixed valve core and the movable valve core of the present invention;

[0038] Figure 8 Schematic diagram of the third connection state of the fixed valve core and the movable valve core of the present invention;

[0039] Fig. 9 Schematic diagram of the connection state N of the fixed valve core and the movable valve core of the present invention;

[0040] Fig.10 Schematic diagram of the connection state 5 of the fixed valve core and the movable valve core of the present invention;

[0041] Fig.11 Schematic diagram of the connection state 6 of the fixed valve core and the movable valve core of the present invention.

[0042] Figure numerals: 1. valve head; 11. injection channel; 12. exchange channel; 13. first mounting groove; 2. valve body; 21. positioning pin; 22. rotating groove; 23. first bearing groove; 24. second bearing groove; 3. valve core rotating shaft; 31. disc-shaped spring piece; 32. first bearing; 33. second bearing; 34. second mounting groove; 4. fixed valve core; 41. L-shaped groove; 42. through groove; 43. COM channel; 5. moving valve core; 51. long groove; 52. arc groove; 6. syringe; 61. cleaning groove; 7. upper sample bottle; 71. injection needle; 8. pressure control valve; 81. solenoid valve; 82. gas diverter; 83. directional control valve; 9. collecting bottle; 91. SPE column. DETAILED DESCRIPTION

[0043] The following is combined with Figure 1-11 The present invention is described in further detail.

[0044] The embodiment of the invention discloses a flow path system with a multi-channel selection valve and a use method thereof.

[0045] Reference Figure 1-4, a multi-channel selection valve, comprising: a valve head 1, a valve body 2, a valve core shaft 3, a movable valve core 5 and a fixed valve core 4, with the valve head 1 being the upper part and the valve body 2 being the lower part for description, the connection between the valve head 1 and the valve body 2 is sealed, the movable valve core 5 can rotate relative to the fixed valve core 4, the valve head 1 is provided with an injection channel 11 and at least two exchange channels 12 that pass through the upper and lower parts of the body, and the lower end of the valve head 1 is provided with a first mounting groove 13 for embedding the fixed valve core 4; a rotating groove 22 that passes through the upper and lower parts of the body is provided in the middle part of the valve body 2, the valve core shaft 3 is rotatably connected in the rotating groove 22, the lower end of the valve core shaft 3 passes through the lower surface of the valve body 2 as a control end, and the upper end of the valve core shaft 3 is provided with a second mounting groove 34 for embedding the movable valve core 5; the valve head 1 and the valve body 2 are sealed and connected, the fixed valve core 4 and the movable valve core 5 are in the sealed space formed by the valve head 1 and the valve body 2, and the movable valve core 5 can rotate relative to the fixed valve core 4;

[0046] A COM channel 43 is provided at the center of the fixed valve core 4, which passes through the upper and lower parts of the body. The COM channel 43 is connected to the injection channel 11. The fixed valve core 4 is provided with a plurality of through grooves 42 which pass through the upper and lower parts of the body and are connected to the exchange channel 12, and three adjacent L-shaped grooves 41 arranged in an arc shape. The number of the through grooves 42 and the L-shaped grooves 41 can be changed according to the different functions to be realized. The number of the L-shaped grooves 41 is at least two, and each through groove 42 and each L-shaped groove 41 are located on a circle centered on the COM channel 43;

[0047] Adjacent long grooves 51 and circular arc grooves 52 are provided on the upper surface of the movable valve core 5. One end of the long groove 51 is arranged at the center of the movable valve core 5 and is connected to the COM channel 43, and the other end is connected to the through groove 42 or the L-shaped groove 41. The center of the circular arc groove 52 is located at the center of the movable valve core 5 and the circular arc groove 52 is connected to the L-shaped groove 41. The width of the circular arc groove 52 is equal to the width of the through groove 42. Assuming that the width of the long groove 51 is a, the length of the long groove 51 is b, and the distance from the circular arc groove 52 to the center of the movable valve core 5 is c, then bc>a, that is, the farthest distance from the circular arc groove 52 to the center of the movable valve core 5 is less than the shortest distance from the through groove 42 to the center of the fixed valve core 4. The farthest distance from the circular arc groove 52 to the center of the movable valve core 5 may also be equal to the shortest distance from the through groove 42 to the center of the fixed valve core 4, as long as the circular arc groove 52 can only be connected to the L-shaped groove 41.

[0048] By arranging three L-shaped grooves 41 and multiple through grooves 42 and a COM channel 43 connected to the injection channel 11 on the fixed valve core 4, and arranging a long groove 51 for connecting an L-shaped groove 41 or a through groove 42 and the injection channel 11 on the movable valve core 5, a flow path is formed. The flow path where the long groove 51 is located is called flow path 1, which is used to pass liquid into and discharge liquid from the inside of the multi-channel selection valve. The movable valve core 5 is driven to rotate by the valve core rotating shaft 3 to change the interface of the flow path, that is, different L-shaped grooves 41 or through grooves 42, so that there is no need to match the three-way valve in the prior art, thereby avoiding the existing flow path system with both a multi-channel selection valve and a three-way valve. The problem of damage caused by residual mud and sand particles when processing water samples in the three-way valve is solved; an arc groove 52 is provided on the movable valve core 5 for connecting the two L-shaped grooves 41 to form another flow path. The flow path where the arc groove 52 is located is called flow path two. In the flow path system with a multi-channel selection valve, the arc groove 52 is only connected to the L-shaped groove 41. The movable valve core 5 is rotated by the valve core shaft 3 to change the interface position of the flow path, that is, different L-shaped grooves 41, thereby reducing the number of flow path interfaces of different functional mechanisms of the existing flow path system with a multi-channel selection valve, reducing the number of samples remaining in multiple places in the flow path system, and facilitating the operation of the flow path system, saving costs.

[0049] The cross section of the rotating groove 22 is T-shaped, the valve core rotating shaft 3 is Y-shaped, and a disc-shaped spring piece 31 is installed on the lower side of the valve core rotating shaft 3. The bottom surfaces on both sides of the valve core rotating shaft 3 and the bottom surfaces on both sides of the rotating groove 22 are in contact with the disc-shaped spring piece 31. The disc-shaped spring piece 31 is installed at the position of the valve core rotating shaft 3 to the bottom surface of the rotating groove 22, that is, on the side of the valve core rotating shaft 3 away from the movable valve core 5. The valve core rotating shaft 3 is inserted into the disc-shaped spring piece 31 from the hollow part in the middle of the disc-shaped spring piece 31, so that the movable valve core 5 can rotate against the lower surface of the fixed valve core 4, so that the two are tightly connected without air leakage.

[0050] A first annular bearing groove 23 is provided on the bottom surface of the rotation groove 22, and a first bearing 32 is installed on the circumferential side wall of the lower side of the valve core rotation shaft 3, and the first bearing 32 is rotatably connected in the first bearing groove 23. A second annular bearing groove 24 is provided on the bottom surface of the first bearing groove 23, and a second bearing 33 is installed on the circumferential side wall of the lower side of the valve core rotation shaft 3, and the second bearing 33 is rotatably connected in the second bearing groove 24. The two sides of the cross section formed by the rotation groove 22, the first bearing groove 23 and the second bearing groove 24 are symmetrically stepped.

[0051] The first bearing 32 is installed on the circumferential side wall of the lower side of the valve core shaft 3 to realize the rotation of the valve core shaft 3 in the valve body 2. The second bearing 33 is installed on the circumferential side wall of the lower side of the valve core shaft 3. The second bearing 33 and the first bearing 32 form a set of bearings, respectively bearing radial force and axial force. The valve core shaft 3 is not easy to tilt when rotating, thereby ensuring that the fixed valve core 4 and the movable valve core 5 are tightly connected and leak-proof. The first bearing groove 23, the second bearing groove 24, and the positioning groove cooperate to form a total groove for installing the valve core shaft 3 and the first bearing 32, the second bearing 33, and the disc-shaped spring 31, so that the valve core shaft 3 is not easy to deviate when rotating.

[0052] The upper surface of the valve body 2 is provided with a positioning pin 21 protruding from the main body, and the lower surface of the valve head 1 is provided with a positioning groove, into which the positioning pin 21 is inserted. When the valve head 1 and the valve body 2 are installed, the positioning pin 21 installed on the valve body 2 can be inserted into the positioning groove of the valve head 1. Since the center of the fixed valve core 4 and the movable valve core 5 can be determined to the position of the positioning pin 21, when the valve head 1 and the valve body 2 are tightly fitted, the center of the fixed valve core 4 and the movable valve core 5 can be directly aligned, which is convenient for operation.

[0053] Reference Figure 5 , a flow path system with the above-mentioned multi-channel selection valve, further comprising: a syringe 6 connected to the injection channel 11 and an injection mechanism, a nitrogen blowing mechanism, a collecting mechanism and a cleaning tank 61 connected to the exchange channel 12, the exchange channel 12 is used to connect the injection mechanism, the nitrogen blowing mechanism, the collecting mechanism, and the cleaning tank 61, the injection mechanism is connected to an L-shaped groove 41 adjacent to both the through groove 42 and the L-shaped groove 41, and the cleaning tank 61 is connected to the through groove 42 adjacent to the L-shaped groove 41, the nitrogen blowing mechanism is connected to the L-shaped groove 41 adjacent to both the two L-shaped grooves 41, and the collecting mechanism is connected to another L-shaped groove 41 adjacent to both the through groove 42 and the L-shaped groove 41; as Figure 3-11 As shown, the through grooves 42 marked 1, 6-12 are through grooves 42 with solvents, the through groove 42 marked 5 is connected to the cleaning groove 61, the L-shaped groove 41 marked 2 is connected to the collection mechanism. The L-shaped groove 41 marked 3 is connected to the nitrogen blowing mechanism, and the L-shaped groove 41 marked 4 is connected to the injection mechanism.

[0054] The injection mechanism includes an upper sample bottle 7 and an injection needle 71 arranged between the multi-channel selection valve and the upper sample bottle 7. The nitrogen blowing mechanism is used to unidirectionally introduce nitrogen into the multi-channel selection valve. The nitrogen blowing mechanism includes a nitrogen input end and a gas splitter 82, a directional control valve 83, an electromagnetic valve 81 and a pressure control valve 8 which are sequentially connected in series from the multi-channel selection valve to the nitrogen input end. The pressure control valve 8 is used to adjust the pressure of the input nitrogen. The electromagnetic valve 81 is used to control the on and off of the nitrogen. The gas splitter 82 and the directional control valve 83 are used to control the flow direction of the nitrogen, thereby forming a nitrogen blowing mechanism that can only introduce nitrogen into the multi-channel selection valve unidirectionally. The collecting mechanism includes a collecting bottle 9 and an SPE column 91 arranged between the multi-channel selection valve and the collecting bottle 9.

[0055] The nitrogen blowing mechanism is used to introduce nitrogen into the multi-channel selection valve in a unidirectional manner. The collecting bottle 9 and the injection mechanism can connect the two flow paths of the multi-channel selection valve. The sample or solvent can enter the collecting bottle 9 to realize the solid phase extraction function of the SPE column 91. The valve core 5 is rotated by rotating the shaft 3 to control the rotation of the valve core 5 to realize the switching of the flow path composition characteristics, so as to realize the switching of different functions of the flow path system, and the system integration is relatively high.

[0056] A method for using the flow path system with a multi-channel selection valve is to fill a solvent into any through groove 42 except the through groove 42 connected to the cleaning groove 61, comprising the following steps:

[0057] S1, rotate the valve core shaft 3 until the long groove 51 is connected to the through groove 42 adjacent to the L-shaped groove 41 connected to the collection mechanism, and the L-shaped groove 41 connected to the collection mechanism and the L-shaped groove 41 connected to the nitrogen blowing mechanism are both connected to the arc groove 52, such as Figure 6 In the connection state 1 of the fixed valve core 4 and the movable valve core 5 shown, the nitrogen blowing mechanism introduces nitrogen into the collecting mechanism; the flow path where the arc groove 52 is located is blown dry by introducing nitrogen to the SPE column 91;

[0058] S2, rotate the valve core shaft 3 until the long groove 51 is connected to the L-shaped groove 41 connected to the collection mechanism, the L-shaped groove 41 connected to the nitrogen blowing mechanism and the L-shaped groove 41 connected to the injection mechanism are both connected to the arc groove 52, such as Figure 7 In the second connection state of the fixed valve core 4 and the movable valve core 5 shown, the nitrogen blowing mechanism introduces nitrogen into the injection mechanism, and the flow path where the arc groove 52 is located is blown dry by introducing nitrogen to the injection needle 71;

[0059] S3, rotating the valve core shaft 3, until the long groove 51 is connected with any through groove 42 containing solvent, and the syringe 6 extracts the solvent, such as Figure 6 The connection state of the fixed valve core 4 and the movable valve core 5 is shown in FIG. Figure 8 The connection state of the fixed valve core 4 and the movable valve core 5 shown in FIG. Fig. 9The connection state N of the fixed valve core 4 and the movable valve core 5 is shown, and S2 is repeated, the syringe 6 discharges the extracted solvent to the collection mechanism, and the flow path where the long groove 51 is located is the syringe 6 extracting the solvent and transporting it to the collection bottle 9 to contact the SPE column 91;

[0060] S4, rotating the valve core shaft 3, until the long groove 51 is connected to the L-shaped groove 41 connected to the injection mechanism, such as Fig.10 In the fifth connection state of the fixed valve core 4 and the movable valve core 5, the syringe 6 extracts the sample in the upper sample bottle 7, and S2 is repeated. The syringe 6 discharges the extracted sample to the collection mechanism. The flow path where the long groove 51 is located extracts the sample in the upper sample bottle 7 by the syringe 6 and transports it to the collection bottle 9 to contact the SPE column 91;

[0061] S5, rotating the valve core shaft 3, until the long groove 51 is connected with the through groove 42 connected with the cleaning groove 61, such as Fig.11 In the sixth connection state between the fixed valve core 4 and the movable valve core 5 shown in the figure, the flow path where the long groove 51 is located is discharged to the cleaning groove 61 by the syringe 6, the COM channel 43 of the fixed valve core 4 is connected with the through groove 42 connected with the cleaning groove 61, the flow path where the arc groove 52 is located is blocked, and the syringe 6 pushes out the solvent to discharge the waste. The injection needle 71 can also be inserted into the cleaning groove 61 first, and then the solvent in the syringe 6 is pushed out to clean the injection needle 71.

[0062] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-channel selector valve, characterized in that: The valve body comprises, from top to bottom, a valve head (1), a valve body (2), a valve core rotating shaft (3), and a fixed valve core (4) and a movable valve core (5) arranged between the valve head (1) and the valve core rotating shaft (3) and fitted with each other. The valve head (1) is provided with a through injection channel (11) and exchange channels (12) located on both sides of the injection channel (11). A first mounting groove (13) for embedding the fixed valve core (4) is provided below the valve head (1); The middle of the valve body (2) is provided with a rotation groove (22) penetrating from top to bottom, the valve core rotation shaft (3) is rotatably connected in the rotation groove (22), and the upper end of the valve core rotation shaft (3) is provided with a second installation groove (34) for embedding the movable valve core (5); The fixed valve core (4) has a COM channel (43) at its center, which passes through the top and bottom and is connected to the injection channel (11). The fixed valve core (4) also has a plurality of through grooves (42) which pass through and are connected to the exchange channel (12) and at least two adjacent L-shaped grooves (41) arranged in an arc shape. Each of the through grooves (42) and each of the L-shaped grooves (41) are located on a circle with the COM channel (43) as its center. The upper surface of the movable valve core (5) is provided with adjacent long grooves (51) and circular arc grooves (52); one end of the long groove (51) is connected to the center of the movable valve core (5) and to the COM channel (43); the other end is connected to the through groove (42) or the L-shaped groove (41); the center of the circular arc groove (52) coincides with the center of the movable valve core (5); the circular arc groove (52) and the L-shaped groove (41) are connected; the farthest distance from the circular arc groove (52) to the center of the movable valve core (5) is less than or equal to the shortest distance from the through groove (42) to the center of the fixed valve core (4).

2. A multi-channel selector valve according to claim 1, characterized in that: The vertical cross section of the rotating groove (22) is T-shaped, and the vertical cross section of the valve core rotating shaft (3) is Y-shaped. A disc-shaped spring piece (31) is installed on the lower side of the valve core rotating shaft (3), and the bottom surfaces on both sides of the valve core rotating shaft (3) and the bottom surfaces on both sides of the rotating groove (22) are in contact with the disc-shaped spring piece (31).

3. A multi-channel selector valve according to claim 2, characterized in that: The bottom surface of the rotating groove (22) is provided with an annular first bearing groove (23), and the lower side wall of the valve core rotating shaft (3) is provided with a first bearing (32), and the first bearing (32) is rotatably connected in the first bearing groove (23).

4. A multi-channel selector valve according to claim 3, characterized in that: A second annular bearing groove (24) is also provided at the lower part of the first bearing groove (23); a second bearing (33) is installed on the lower side wall of the valve core shaft (3); the second bearing (33) is rotatably connected in the second bearing groove (24); and the groove width of the second bearing groove (24) is smaller than the groove width of the first bearing groove (23).

5. A multi-channel selector valve according to claim 1, characterized in that: The upper surface of the valve body (2) is provided with a protruding positioning pin (21), and the lower surface of the valve head (1) is provided with a positioning groove, and the positioning pin (21) is inserted into the positioning groove.

6. A flow path system having a multi-channel selector valve according to any one of claims 1 to 5, characterized in that: Also includes: A syringe (6) connected to the injection channel (11) and an injection mechanism, a nitrogen blowing mechanism, a collecting mechanism and a cleaning groove (61) connected to the exchange channel (12), wherein the injection mechanism is connected to an L-shaped groove (41) arranged adjacent to both the through groove (42) and the L-shaped groove (41), and the cleaning groove (61) is connected to the through groove (42) arranged adjacent to the L-shaped groove (41), the nitrogen blowing mechanism is connected to the L-shaped groove (41) arranged adjacent to both the two L-shaped grooves (41), and the collecting mechanism is connected to another L-shaped groove (41) arranged adjacent to both the through groove (42) and the L-shaped groove (41); The injection mechanism comprises an upper sample bottle (7) and an injection needle (71) arranged between the valve head (1) and the upper sample bottle (7); the nitrogen blowing mechanism is used for unidirectionally introducing nitrogen into the L-shaped groove (41); and the collecting mechanism comprises a collecting bottle (9) and an SPE column (91) arranged between the multi-channel selection valve and the collecting bottle (9).

7. A flow path system with a multi-channel selection valve according to claim 6, characterized in that: The nitrogen blowing mechanism comprises a nitrogen input end and a gas flow divider (82), a directional control valve (83), a solenoid valve (81) and a pressure control valve (8) which are sequentially connected in series from a multi-channel selection valve to the nitrogen input end.

8. A method for using the flow path system with a multi-channel selection valve according to claim 6 or 7, characterized in that: A solvent is placed in any through groove (42) except the through groove (42) connected to the cleaning groove (61), and then the following steps are performed: S1, rotating the valve core shaft (3) until the long groove (51) and the through groove (42) adjacent to the L-shaped groove (41) connected to the collecting mechanism are connected, the L-shaped groove (41) connected to the collecting mechanism and the L-shaped groove (41) connected to the nitrogen blowing mechanism are both connected to the arc groove (52), and the nitrogen blowing mechanism introduces nitrogen into the collecting mechanism; S2, rotating the valve core shaft (3) until the long groove (51) is connected to the L-shaped groove (41) connected to the collecting mechanism, the L-shaped groove (41) connected to the nitrogen blowing mechanism and the L-shaped groove (41) connected to the injection mechanism are both connected to the arc groove (52), and the nitrogen blowing mechanism introduces nitrogen into the injection mechanism; S3, rotating the valve core shaft (3) until the long groove (51) is connected to any through groove (42) containing the solvent, and the syringe (6) extracts the solvent, and repeats S2, and the syringe (6) discharges the extracted solvent into the collection mechanism; S4, rotating the valve core shaft (3) until the long groove (51) is connected to the L-shaped groove (41) connected to the injection mechanism, and the syringe (6) extracts the sample in the upper sample bottle (7), and repeats S2, and the syringe (6) discharges the extracted sample into the collection mechanism; S5, rotating the valve core shaft (3) until the long groove (51) is connected to the through groove (42) connected to the cleaning groove (61).

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