Rotary valve, sample loading device and chromatography experiment system

Abstract

The present invention discloses a rotary valve, a sample loading device and a chromatography experiment system. The rotary valve provided in the present invention can at least realize the sample loading, sample ring loading and waste liquid cleaning of the pipeline by the first power component and the second power component through four flow channels arranged on the second valve body, which greatly simplifies the system structure, eliminates the need for manual operation and improves the experimental efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of experimental equipment, and in particular to a rotary valve, a sample loading device and a chromatography experimental system. Background Art

[0002] Chromatography equipment is an instrument that uses the differences in the physical and chemical properties of the components in a mixture to separate and analyze substances due to the different distribution degrees and thus different flow rates of the substances through the chromatography column.

[0003] When analyzing samples using chromatography equipment, it is usually necessary to use a loading system to perform the loading operation. When the sample type is greater than one, for example, there are two or more sample types, the loading system is quite complicated and requires the coordination of multiple valves, and even manual operation by the operator to complete the loading.

[0004] That is, the current loading system structure is relatively complex and the operation is cumbersome.

[0005] Therefore, how to simplify the sample loading system is a technical problem that technicians in this field have always paid attention to. Summary of the invention

[0006] The object of the present invention is to provide a rotary valve, a sample loading device and a chromatography experiment system which are simple in structure and easy to operate.

[0007] The present invention provides a rotary valve, comprising a first valve body and a second valve body capable of relative rotation; the first valve body has a connecting surface and a first mating surface, the connecting surface is provided with first to seventh interfaces; the mating surface has first to seventh openings corresponding to the first to seventh interfaces and communicating with the interior of the first valve body;

[0008] The second valve body is provided with a first flow channel, a second flow channel, a third flow channel and a fourth flow channel, and the flow channels are not connected to each other;

[0009] The second valve body is at least capable of rotating relative to the first valve body to a first position, a second position, a third position and a fourth position;

[0010] When the second valve body is located at the first position, the first opening is connected to the fourth opening through the third flow channel; the second opening is connected to the fifth port through the first flow channel;

[0011] When the second valve body is in the second position, the first opening is connected to the third opening through the fourth flow channel, the sixth opening is connected to the fourth opening through the third flow channel; the second opening is connected to the fifth opening through the second flow channel;

[0012] When the second valve body is in the third position, the second opening is connected to the fourth opening through the third flow channel; the first opening is connected to the fifth opening through the second flow channel;

[0013] When the second valve body is in the fourth position, the second opening is connected to the sixth opening through the first flow channel, and the third opening is connected to the seventh opening through the fourth flow channel.

[0014] The rotary valve provided in the present invention, by setting four flow channels in the second valve body 2, can at least realize the first power component and the second power component to load the sample, load the sample ring and clean the waste liquid of the pipeline, etc., which greatly simplifies the system structure, eliminates the need for manual operation, and improves the experimental efficiency.

[0015] Optionally, the second valve body has a second mating surface arranged opposite to the first mating surface, and the first mating surface and the second mating surface are sealed and rotatably matched; the first flow channel, the second flow channel, the third flow channel and the fourth flow channel are all groove-type flow channels opened on the second mating surface.

[0016] Optionally, the third flow channel is a radially extending groove-type flow channel, the third flow channel is at least partially located at the rotation center of the second mating surface, the fourth opening portion is located at the rotation center of the first mating surface, and at least part of the groove sections of the first flow channel and the second flow channel are symmetrical about the third flow channel.

[0017] Optionally, the first flow channel and the second flow channel are arc-shaped groove segments with the same diameter, and the distance from the outer end of the third flow channel to the rotation center of the second mating surface is greater than or equal to the radius of the arc-shaped groove segment.

[0018] Optionally, the fourth flow channel is a straight groove segment, and the extension directions of the fourth flow channel and the third flow channel are perpendicular.

[0019] Optionally, when rotating from the first position to the second position, the counterclockwise rotation angle of the second valve body ranges from 120° to 140°;

[0020] Alternatively, when rotating from the first position to the third position, the second valve body rotates counterclockwise by an angle ranging from 80° to 100°;

[0021] Alternatively, when rotating from the first position to the fourth position, the second valve body rotates counterclockwise at an angle ranging from 30° to 50°.

[0022] Optionally, the connection surface is further provided with an eighth interface and a ninth interface, and correspondingly, the first mating surface is provided with an eighth opening and a ninth opening which are in one-to-one communication with the eighth interface and the ninth interface;

[0023] When the second valve body is in the first position, the eighth opening is also connected to the sixth opening through the fourth flow channel, and the third opening is connected to the ninth opening through the second flow channel;

[0024] When the second valve body is located at the second position, the eighth opening is also connected to the seventh opening through the first flow channel;

[0025] When the second valve body is located at the third position, the eighth opening is also connected to the ninth opening through the fourth flow channel;

[0026] When the second valve body is located at the fourth position, the first opening is also connected to the ninth opening through the second flow channel.

[0027] In addition, the present invention also provides a loading device, comprising a first power component, a second power component, a sample ring and the rotary valve described in any one of the above items, wherein the first power component and the second power component can both provide flow power for the fluid medium; the outlet of the first power component is connected to the first interface of the rotary valve, the outlet of the second power component is connected to the second interface of the rotary valve, the two ends of the sample ring are respectively connected to the third interface and the sixth interface, the fifth interface and the seventh interface are respectively used to communicate with the corresponding external waste liquid pipelines, and the fourth interface is used to connect to the downstream chromatography pipeline.

[0028] Furthermore, the present invention also provides a loading device, comprising a first power component, a second power component, a sample ring and the rotary valve, wherein the first power component and the second power component can both provide flow power for the fluid medium; the outlet of the first power component is connected to the second interface of the rotary valve, the outlet of the second power component is connected to the first interface of the rotary valve, the two ends of the sample ring are connected to the ninth opening and the seventh opening, the third interface, the fifth interface and the sixth interface are respectively used to communicate with the corresponding external waste liquid pipelines, and the fourth interface is used to connect to the downstream chromatography pipeline.

[0029] In addition, the present invention also provides a chromatography experiment system, the sample loading device mentioned above.

[0030] The sample loading device and chromatography experiment system of the present invention have the rotary valve described in any of the above embodiments, so the sample loading device and chromatography experiment system also have the above technical effects of the above rotary valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of a rotary valve in an embodiment of the present invention; the figure shows a perspective view of the main structure of the rotary valve, wherein the dotted line is the main structure of the second valve body;

[0032] Figure 2 for Figure 1 A schematic structural diagram of a first valve body of the rotary valve shown;

[0033] Figure 3 for Figure 1 A schematic structural diagram of a second valve body of the rotary valve shown;

[0034] Figure 4 It is a structural block diagram of a chromatography experiment system in which the first valve body is in a first position in an embodiment of the present invention;

[0035] Figure 5 It is a structural block diagram of a chromatography experiment system in which the second valve body is in a second position in an embodiment of the present invention;

[0036] Figure 6 It is a structural block diagram of a chromatography experiment system in which the second valve body is in a third position in an embodiment of the present invention;

[0037] Figure 7 This is a structural block diagram of a chromatography experiment system in which the second valve body is in a fourth position in an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] This article takes the example of a rotary valve connected to a chromatography experimental system as a loading valve to continue to introduce the technical solution and technical effects of the rotary valve. Of course, those skilled in the art should understand that the rotary valve provided in this application can also be applied to other technical fields.

[0040] Please refer to Figures 1 to 7 , Figure 1 It is a structural schematic diagram of a rotary valve in an embodiment of the present invention; the figure shows a perspective view of the main structure of the rotary valve, wherein the dotted line is the main structure of the second valve body; Figure 2 for Figure 1 A schematic structural diagram of a first valve body of the rotary valve shown; Figure 3 for Figure 1 A schematic structural diagram of a second valve body of the rotary valve shown; Figure 4 It is a structural block diagram of a chromatography experiment system in which the first valve body is in a first position in an embodiment of the present invention; Figure 5 It is a structural block diagram of a chromatography experiment system in which the second valve body is in a second position in one embodiment of the present invention; Figure 6 It is a structural block diagram of a chromatography experiment system in which the second valve body is in the third position in one embodiment of the present invention; Figure 7 This is a structural block diagram of a chromatography experiment system in which the second valve body is in a fourth position in an embodiment of the present invention.

[0041] The present invention provides a chromatography experimental system, which at least includes a detection device 700, a control valve 500, a chromatography column 600 and a sample loading device. The specific structure of the detection device and the pumping component is not described herein, but this does not hinder the understanding of the technical solution of this invention by those skilled in the art.

[0042] The detection device 700 is used to analyze the sample liquid. Its specific structure is not introduced in detail herein. Please refer to the prior art.

[0043] The sample loading device provided by the present invention further includes a rotary valve, a first power component 100 and a second power component 200. The first power component 100 and the second power component 200 are mainly used to provide power for the sample liquid to flow in the pipeline. The first power component 100 and the second power component 200 can be pumps, and the number of pumps can be determined according to the specific situation. In order to simplify the description of the technical solution, this application defines the first power component 100 as a system pump and the second power component 200 as a sample pump. Of course, the number of the first power component 100 and the second power component 200 is not limited to the description herein, and can also be in other forms.

[0044] The rotary valve provided by the present invention includes a first valve body 1 and a second valve body 2 that can rotate relative to each other, that is, the second valve body 2 can rotate around the central axis of rotation of the two. Usually, the second valve body 2 can be partially located inside the first valve body 1, that is, the first valve body 1 has an inner cavity, and the second valve body 2 can be partially or completely located in the inner cavity of the first valve body 1, and the first valve body 1 and the second valve body 2 rotate in a circumferential direction. The appearance of the first valve body 1 and the second valve body 2 can be designed as needed, and this article does not make specific restrictions.

[0045] Of course, the second valve body 2 may also be completely located outside the first valve body 1 .

[0046] In this embodiment, the first valve body 1 has a connection surface 10 and a first mating surface 11, wherein the connection surface 10 is provided with a first interface E1, a second interface E2, a third interface E3, a fourth interface E4, a fifth interface E5, a sixth interface E6 and a seventh interface E7, and the first mating surface 11 of the first valve body 1 is provided with a first opening K1, a second opening K2, a third opening K3, a fourth opening K4, a fifth opening K5, a sixth opening K6 and a seventh opening K7 corresponding to the first interface to the seventh interface, which are respectively connected to the first interface E1, the second interface E2, the third interface E3, the fourth interface E4, the fifth interface E5, the sixth interface E6 and the seventh interface E7 through the interior of the first valve body 1. The channels connecting the various interfaces and the corresponding openings in the first valve body 1 may be the same or different, and the accompanying drawings herein show a specific embodiment in which the shapes of the various channels 1a are substantially the same.

[0047] As can be seen from the above description, the interface on the connection surface 10 is mainly used to connect with the external pipeline. The connection surface 10 is usually the outer surface of the first valve body. Each interface can be set at a suitable position on the connection surface 10 of the first valve body 1, as long as it can be reliably connected to other components. In order to ensure the reliability of the connection pipeline and improve the connection efficiency, the interface of each interface unit can be marked.

[0048] In the present application, the second valve body 2 is provided with a first flow channel S1, a second flow channel S2, a third flow channel S3 and a fourth flow channel L, and the flow channels are not connected to each other; that is, the flow channels are independent of each other.

[0049] The second valve body 2 in the present application can rotate relative to the first valve body 1 to at least a first position, a second position, a third position and a fourth position.

[0050] Taking the use of a rotary valve as a loading valve as an example, in the first embodiment, the connection relationship between the various components in the loading device is as follows: the outlet of the system pump is connected to the first interface of the rotary valve through a pipeline, the outlet of the sample pump is connected to the second interface E2 of the rotary valve through a pipeline, the two ends of the sample loop are respectively connected to the third interface E3 and the sixth interface E6, the fifth interface E5 and the seventh interface E7 are used to communicate with the corresponding external waste liquid pipelines, the fourth interface E4 is used to connect to the downstream chromatography pipeline, and the control valve is connected through the chromatography pipeline.

[0051] Please refer to Figure 4. When the second valve body 2 is in the first position, the first opening K1 is connected to the fourth opening K4 through the third flow channel L1. The flow path of the fluid is: system pump-E1-L1-K4-E4-control valve. That is to say, at this time, the system pump can be used as a sample pump to pump the fluid into the control valve.

[0052] When the second valve body 2 is in the first position, the second opening K2 is connected to the fifth interface through the first flow channel S1 at the same time. The flow path of the fluid is: sample pump-E2-K2-S1-K5-E5. In this way, the sample pump is connected to the external pipeline connected to the fifth interface K5. At this time, the sample pump can pump the corresponding liquid along the above flow path to the external pipeline connected to the fifth interface K5. For example, the sample pump can clean the pipeline and pipe between the second interface E2 and the fifth interface E5 connected to the rotary valve.

[0053] In summary, when the second valve body 2 is in the first position, the system pump can be used as a sample loading pump, and the sample pump can be used as a waste liquid cleaning pump.

[0054] For the rotary valve provided with the eighth interface and the eighth opening connected through the inside of the first valve body 1, and the connected ninth interface and the ninth opening K9, when the second valve body 2 is in the first position, the eighth opening K8 is also connected to the sixth opening K6 through the fourth flow channel L2, and the sixth opening K6 is connected to the ninth opening K9 through the second flow channel S2, and the flow path of the flow path is: E8—K8—L2—K6—E6—sample loop—E3—K3—S2—K——E9, at this time, the component connected to the eighth interface (such as a syringe, etc.) can load the sample loop, which further increases the flexibility of the sample loop loading and is beneficial to the loading requirements when the sample amount is small.

[0055] Please refer to Figure 5 When the second valve body is in the second position, the first opening K1 is connected to the third opening K3 through the fourth flow channel L2, and the sixth opening K6 is connected to the fourth opening K4 through the third flow channel L1. The flow path of the fluid is: system pump-K1-L2-K3-E3-sample loop-E6-K6-L1-K4-E4-control valve. At this time, the system pump is in a loading state for the sample loop; at the same time, the second opening K2 is connected to the fifth opening K5 through the second flow channel S2. The flow path of the flow path is: sample pump-E2-K2-S2-K5-E5. In this way, the sample pump can clean the channel between the second interface and the second opening, the channel between the fifth opening and the fifth interface, and the second flow channel for waste liquid.

[0056] That is to say, when the second valve body 2 is located at the second position, the system pump can load the sample loop, and the sample pump can also be connected to the waste liquid pipe through the rotating valve.

[0057] Of course, in the second position, the eighth opening K8 is also connected to the seventh opening K7 through the first flow channel S12, that is, the pipeline between the eighth interface E8 and the seventh interface E7 passes through the first flow channel S12, so that the waste liquid cleaning of the connecting path can be achieved with the help of external components connected to the eighth interface E8 and the seventh interface E7.

[0058] Please refer to Figure 6 When the second valve body 2 is in the third position, the second opening K2 is connected to the fourth opening K4 through the third flow channel L1, and the flow path of the flow path is: sample pump-E2-K2-L1-K4-E4-control valve. At this time, the sample pump is connected to the inlet of the control valve through the rotary valve, which can provide fluid medium for the control valve and play a sample loading function. When the second valve body 2 is in the third position, the first opening K1 is also connected to the fifth opening K5 through the second flow channel S2, that is, at this time, the system pump is connected to the external pipeline connected to the fifth interface E5 through the rotary valve, and the system pump can be used to perform waste liquid flushing and other steps on the flow path.

[0059] For the rotary valve provided with the eighth port and the ninth port, when the second valve body 2 is in the third position, the eighth port K8 is also connected to the ninth port K9 through the fourth flow channel L2, and the function is the same as described above.

[0060] Please refer to Figure 7 When the second valve body is in the fourth position, the second opening K2 is connected to the sixth opening K6 through the first flow channel S1, and the third opening K3 is connected to the seventh opening K7 through the fourth flow channel L2. The flow path of the flow path is: sample pump-E2-K2-S1-K6-E6-sample ring-E3-K3-L2-K7-E7. At this time, the sample pump is connected to the sample ring through the rotating valve, which plays a role in quantitative loading of the sample ring. The excess sample flows out from the seventh interface after passing through the rotating valve.

[0061] For the rotary valve with the eighth and ninth interfaces, when the second valve body 2 is in the fourth position, the first opening K1 is also connected to the ninth opening K9 through the second flow channel S2. At this time, the system pump can perform operations such as waste liquid cleaning on the pipeline on the flow path.

[0062] In the second specific embodiment, the rotary valve can also be connected to other components in the sample loading device in the following manner, wherein, compared with the above-mentioned first specific embodiment, the connection interfaces of the first power component 100 and the second power component 200 are interchanged, and the fourth interface is used to connect the downstream chromatography pipeline. The main difference is that the interface between the sample loop and the external waste liquid pipe is different from the above-mentioned embodiment, and the two ends of the sample loop are connected to the ninth opening K9 and the seventh opening K7, and the third interface E3, the fifth interface E5 and the sixth interface E6 are respectively used to communicate with the corresponding external waste liquid pipeline. By rotating the second valve body 2, the working states of the first power component and the second power component such as sample loading, loading and waste liquid cleaning can still be realized, and the specific details are not described herein.

[0063] Of course, the eighth interface K8 can also be connected to the third power component and can also load the sample ring.

[0064] The rotary valve provided in the present invention, by setting four flow channels in the second valve body 2, can at least realize the first power component and the second power component to load the sample, load the sample ring and clean the waste liquid of the pipeline, etc., which greatly simplifies the system structure, eliminates the need for manual operation, and improves the experimental efficiency.

[0065] In addition, by adding the eighth interface E8 and the ninth interface E9 to the first valve body 1, a third power component can be added to load the sample loop and clean the waste liquid, thereby improving the flexibility of the rotary valve.

[0066] In a specific embodiment, the second valve body 2 has a second mating surface 21 arranged relative to the first mating surface 11, and the first mating surface 11 and the second mating surface 21 are sealed and rotatably matched; the first flow channel S1, the second flow channel S2, the third flow channel S3 and the fourth flow channel L1 are all groove-type flow channels opened on the second mating surface 21, and the opening of the groove-type flow channel faces the first mating surface 11. The groove-type flow channel molding process is simple, which is conducive to reducing the molding cost of the second valve body. The groove-type flow channel can be formed by integral injection molding or machining.

[0067] In this embodiment, the third flow channel L1 is a radially extending groove-type flow channel. The third flow channel L1 is at least partially located at the rotation center of the second mating surface, and the fourth opening is partially located at the rotation center of the first mating surface. In this way, during the rotation process, the fourth opening and the third flow channel can always face each other and maintain communication. At least part of the groove sections of the first flow channel S1 and the second flow channel S2 are symmetrical about the third flow channel L1. The accompanying drawings show a specific embodiment in which the first flow channel S1 and the second flow channel S2 are symmetrical about the third flow channel L1.

[0068] In this embodiment, the first flow channel S1 and the second flow channel S2 can be arcuate groove segments of the same diameter, and the first flow channel S1 and the second flow channel S2 are separated by a certain distance. The distance from the outer end of the third flow channel L1 to the rotation center of the second mating surface is greater than or equal to the radius of the arcuate groove segment. The distances from the other openings on the first valve body 1 except the fourth opening to the rotation center of the first valve body are roughly equal, and less than or equal to the distance from the outer end of the third flow channel L1 to its rotation center, which is conducive to the connection between the third flow channel L1 and the openings at the corresponding position. Of course, each opening can also be a long strip structure to improve the reliability of the connection.

[0069] In this embodiment, the length of the arc groove segment can be determined according to the specific product. The arc groove segment has a certain arc length along the circumferential direction, so that the corresponding connecting pipeline can be kept conductive within a certain rotation angle, which can compensate for the influence of processing and assembly errors and improve the reliability of the rotary valve.

[0070] In this embodiment, the fourth flow channel L2 is a straight groove segment, and the extending directions of the fourth flow channel L2 and the third flow channel L1 are perpendicular.

[0071] In the above embodiments, when the second valve body rotates from the first position to the second position, the counterclockwise rotation angle ranges from 120° to 140°; it can be any value in this range, such as 120°, 135° or 140°, etc.

[0072] From the first position to the third position, the second valve body rotates counterclockwise by an angle ranging from 80° to 100°; it can be any value within the range, such as 80°, 90° or 100°, etc.

[0073] From the first position to the fourth position, the second valve body rotates counterclockwise by an angle ranging from 30° to 50°, which can be any value within the range, such as 30°, 55° or 50°.

[0074] The above rotation angles can be determined according to the positions of each flow channel and opening, and are not listed one by one in this article.

[0075] In the above embodiments, the first interface E1 to the ninth interface E9 of the first valve body are located on the same cross section of the first valve body, which is convenient for processing. Of course, the first interface E1 to the ninth interface E9 can also be located on different cross sections of the first valve body, and they can be marked for the convenience of connecting the pipes.

[0076] As described above, the chromatography experiment system may also include at least one chromatography column and any of the above-mentioned sample loading devices, and the working port of each chromatography column is connected to the port of the control valve, and each chromatography column can be placed in a bypass, forward flow and reverse flow state through the control valve. The specific structure of the control valve is not described in detail in this article.

[0077] The chromatography experiment system and the sample loading device of the present invention have the rotary valve described in any of the above embodiments, so the chromatography experiment system and the sample loading device also have the above technical effects of the above rotary valve.

[0078] The above is a detailed introduction to a rotary valve, a sample loading device and a chromatography experimental system provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A rotary valve, characterized in that: It comprises a first valve body and a second valve body which can rotate relative to each other; the first valve body has a connecting surface and a first matching surface, the connecting surface is provided with first to seventh interfaces; the first matching surface has first to seventh openings which correspond to the first to seventh interfaces and are connected through the interior of the first valve body; The second valve body is provided with a first flow channel, a second flow channel, a third flow channel and a fourth flow channel, and the flow channels are not connected to each other; The second valve body is at least capable of rotating relative to the first valve body to a first position, a second position, a third position and a fourth position; When the second valve body is located at the first position, the first opening is connected to the fourth opening through the third flow channel; the second opening is connected to the fifth port through the first flow channel; When the second valve body is in the second position, the first opening is connected to the third opening through the fourth flow channel, the sixth opening is connected to the fourth opening through the third flow channel; the second opening is connected to the fifth opening through the second flow channel; When the second valve body is in the third position, the second opening is connected to the fourth opening through the third flow channel; the first opening is connected to the fifth opening through the second flow channel; When the second valve body is in the fourth position, the second opening is connected to the sixth opening through the first flow channel, and the third opening is connected to the seventh opening through the fourth flow channel; The second valve body has a second mating surface arranged relative to the first mating surface, and the first mating surface and the second mating surface are sealed and rotatably matched; the first flow channel, the second flow channel, the third flow channel and the fourth flow channel are all groove-type flow channels opened on the second mating surface; the third flow channel is a radially extending groove-type flow channel, the third flow channel is at least partially located at the rotation center of the second mating surface, the fourth opening portion is located at the rotation center of the first mating surface, and at least part of the groove sections of the first flow channel and the second flow channel are symmetrical about the third flow channel; The first flow channel and the second flow channel are arcuate groove segments with the same diameter, and the distance from the outer end of the third flow channel to the rotation center of the second mating surface is greater than or equal to the radius of the arcuate groove segment; the fourth flow channel is a straight groove segment, and the extension directions of the fourth flow channel and the third flow channel are perpendicular.

2. The rotary valve according to claim 1, characterized in that: When rotating from the first position to the second position, the counterclockwise rotation angle of the second valve body ranges from 120° to 140°; Alternatively, when rotating from the first position to the third position, the second valve body rotates counterclockwise by an angle ranging from 80° to 100°; Alternatively, when rotating from the first position to the fourth position, the second valve body rotates counterclockwise at an angle ranging from 30° to 50°.

3. The rotary valve according to claim 1 or 2, characterized in that: The connection surface is further provided with an eighth interface and a ninth interface, and correspondingly, the first mating surface is provided with an eighth opening and a ninth opening which are in one-to-one communication with the eighth interface and the ninth interface; When the second valve body is in the first position, the eighth opening is also connected to the sixth opening through the fourth flow channel, and the third opening is connected to the ninth opening through the second flow channel; When the second valve body is located at the second position, the eighth opening is also connected to the seventh opening through the first flow channel; When the second valve body is located at the third position, the eighth opening is also connected to the ninth opening through the fourth flow channel; When the second valve body is located at the fourth position, the first opening is also connected to the ninth opening through the second flow channel.

4. A sample loading device, characterized in that: It comprises a first power component, a second power component, a sample loop and the rotary valve according to any one of claims 1 to 3, wherein the first power component and the second power component can both provide flow power for the fluid medium; the outlet of the first power component is connected to the first interface of the rotary valve, the outlet of the second power component is connected to the second interface of the rotary valve, the two ends of the sample loop are respectively connected to the third interface and the sixth interface, the fifth interface and the seventh interface are respectively used to communicate with the corresponding external waste liquid pipelines, and the fourth interface is used to connect to the downstream chromatography pipeline.

5. A sample loading device, characterized in that: It comprises a first power component, a second power component, a sample loop and the rotary valve as claimed in claim 3, wherein the first power component and the second power component can both provide flow power for the fluid medium; the outlet of the first power component is connected to the second interface of the rotary valve, the outlet of the second power component is connected to the first interface of the rotary valve, the two ends of the sample loop are connected to the ninth opening and the seventh opening, the third interface, the fifth interface and the sixth interface are respectively used to communicate with the corresponding external waste liquid pipelines, and the fourth interface is used to connect to the downstream chromatography pipeline.

6. A chromatography experimental system, characterized in that: Comprising the sample loading device described in claim 4 or 5.

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